From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/net/xfrm/Kconfig | 85 ++ kernel/net/xfrm/Makefile | 11 + kernel/net/xfrm/xfrm_algo.c | 800 ++++++++++ kernel/net/xfrm/xfrm_hash.c | 39 + kernel/net/xfrm/xfrm_hash.h | 192 +++ kernel/net/xfrm/xfrm_input.c | 396 +++++ kernel/net/xfrm/xfrm_ipcomp.c | 386 +++++ kernel/net/xfrm/xfrm_output.c | 236 +++ kernel/net/xfrm/xfrm_policy.c | 3397 +++++++++++++++++++++++++++++++++++++++++ kernel/net/xfrm/xfrm_proc.c | 86 ++ kernel/net/xfrm/xfrm_replay.c | 605 ++++++++ kernel/net/xfrm/xfrm_state.c | 2294 ++++++++++++++++++++++++++++ kernel/net/xfrm/xfrm_sysctl.c | 86 ++ kernel/net/xfrm/xfrm_user.c | 3146 ++++++++++++++++++++++++++++++++++++++ 14 files changed, 11759 insertions(+) create mode 100644 kernel/net/xfrm/Kconfig create mode 100644 kernel/net/xfrm/Makefile create mode 100644 kernel/net/xfrm/xfrm_algo.c create mode 100644 kernel/net/xfrm/xfrm_hash.c create mode 100644 kernel/net/xfrm/xfrm_hash.h create mode 100644 kernel/net/xfrm/xfrm_input.c create mode 100644 kernel/net/xfrm/xfrm_ipcomp.c create mode 100644 kernel/net/xfrm/xfrm_output.c create mode 100644 kernel/net/xfrm/xfrm_policy.c create mode 100644 kernel/net/xfrm/xfrm_proc.c create mode 100644 kernel/net/xfrm/xfrm_replay.c create mode 100644 kernel/net/xfrm/xfrm_state.c create mode 100644 kernel/net/xfrm/xfrm_sysctl.c create mode 100644 kernel/net/xfrm/xfrm_user.c (limited to 'kernel/net/xfrm') diff --git a/kernel/net/xfrm/Kconfig b/kernel/net/xfrm/Kconfig new file mode 100644 index 000000000..bda1a1362 --- /dev/null +++ b/kernel/net/xfrm/Kconfig @@ -0,0 +1,85 @@ +# +# XFRM configuration +# +config XFRM + bool + depends on NET + +config XFRM_ALGO + tristate + select XFRM + select CRYPTO + +config XFRM_USER + tristate "Transformation user configuration interface" + depends on INET + select XFRM_ALGO + ---help--- + Support for Transformation(XFRM) user configuration interface + like IPsec used by native Linux tools. + + If unsure, say Y. + +config XFRM_SUB_POLICY + bool "Transformation sub policy support" + depends on XFRM + ---help--- + Support sub policy for developers. By using sub policy with main + one, two policies can be applied to the same packet at once. + Policy which lives shorter time in kernel should be a sub. + + If unsure, say N. + +config XFRM_MIGRATE + bool "Transformation migrate database" + depends on XFRM + ---help--- + A feature to update locator(s) of a given IPsec security + association dynamically. This feature is required, for + instance, in a Mobile IPv6 environment with IPsec configuration + where mobile nodes change their attachment point to the Internet. + + If unsure, say N. + +config XFRM_STATISTICS + bool "Transformation statistics" + depends on INET && XFRM && PROC_FS + ---help--- + This statistics is not a SNMP/MIB specification but shows + statistics about transformation error (or almost error) factor + at packet processing for developer. + + If unsure, say N. + +config XFRM_IPCOMP + tristate + select XFRM_ALGO + select CRYPTO + select CRYPTO_DEFLATE + +config NET_KEY + tristate "PF_KEY sockets" + select XFRM_ALGO + ---help--- + PF_KEYv2 socket family, compatible to KAME ones. + They are required if you are going to use IPsec tools ported + from KAME. + + Say Y unless you know what you are doing. + +config NET_KEY_MIGRATE + bool "PF_KEY MIGRATE" + depends on NET_KEY + select XFRM_MIGRATE + ---help--- + Add a PF_KEY MIGRATE message to PF_KEYv2 socket family. + The PF_KEY MIGRATE message is used to dynamically update + locator(s) of a given IPsec security association. + This feature is required, for instance, in a Mobile IPv6 + environment with IPsec configuration where mobile nodes + change their attachment point to the Internet. Detail + information can be found in the internet-draft + . + + If unsure, say N. + diff --git a/kernel/net/xfrm/Makefile b/kernel/net/xfrm/Makefile new file mode 100644 index 000000000..c0e961983 --- /dev/null +++ b/kernel/net/xfrm/Makefile @@ -0,0 +1,11 @@ +# +# Makefile for the XFRM subsystem. +# + +obj-$(CONFIG_XFRM) := xfrm_policy.o xfrm_state.o xfrm_hash.o \ + xfrm_input.o xfrm_output.o \ + xfrm_sysctl.o xfrm_replay.o +obj-$(CONFIG_XFRM_STATISTICS) += xfrm_proc.o +obj-$(CONFIG_XFRM_ALGO) += xfrm_algo.o +obj-$(CONFIG_XFRM_USER) += xfrm_user.o +obj-$(CONFIG_XFRM_IPCOMP) += xfrm_ipcomp.o diff --git a/kernel/net/xfrm/xfrm_algo.c b/kernel/net/xfrm/xfrm_algo.c new file mode 100644 index 000000000..12e82a5e4 --- /dev/null +++ b/kernel/net/xfrm/xfrm_algo.c @@ -0,0 +1,800 @@ +/* + * xfrm algorithm interface + * + * Copyright (c) 2002 James Morris + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + */ + +#include +#include +#include +#include +#include +#include +#if defined(CONFIG_INET_ESP) || defined(CONFIG_INET_ESP_MODULE) || defined(CONFIG_INET6_ESP) || defined(CONFIG_INET6_ESP_MODULE) +#include +#endif + +/* + * Algorithms supported by IPsec. These entries contain properties which + * are used in key negotiation and xfrm processing, and are used to verify + * that instantiated crypto transforms have correct parameters for IPsec + * purposes. + */ +static struct xfrm_algo_desc aead_list[] = { +{ + .name = "rfc4106(gcm(aes))", + + .uinfo = { + .aead = { + .icv_truncbits = 64, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AES_GCM_ICV8, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "rfc4106(gcm(aes))", + + .uinfo = { + .aead = { + .icv_truncbits = 96, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AES_GCM_ICV12, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "rfc4106(gcm(aes))", + + .uinfo = { + .aead = { + .icv_truncbits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AES_GCM_ICV16, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "rfc4309(ccm(aes))", + + .uinfo = { + .aead = { + .icv_truncbits = 64, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AES_CCM_ICV8, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "rfc4309(ccm(aes))", + + .uinfo = { + .aead = { + .icv_truncbits = 96, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AES_CCM_ICV12, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "rfc4309(ccm(aes))", + + .uinfo = { + .aead = { + .icv_truncbits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AES_CCM_ICV16, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "rfc4543(gcm(aes))", + + .uinfo = { + .aead = { + .icv_truncbits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_NULL_AES_GMAC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +}; + +static struct xfrm_algo_desc aalg_list[] = { +{ + .name = "digest_null", + + .uinfo = { + .auth = { + .icv_truncbits = 0, + .icv_fullbits = 0, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_AALG_NULL, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 0, + .sadb_alg_maxbits = 0 + } +}, +{ + .name = "hmac(md5)", + .compat = "md5", + + .uinfo = { + .auth = { + .icv_truncbits = 96, + .icv_fullbits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_AALG_MD5HMAC, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 128 + } +}, +{ + .name = "hmac(sha1)", + .compat = "sha1", + + .uinfo = { + .auth = { + .icv_truncbits = 96, + .icv_fullbits = 160, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_AALG_SHA1HMAC, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 160, + .sadb_alg_maxbits = 160 + } +}, +{ + .name = "hmac(sha256)", + .compat = "sha256", + + .uinfo = { + .auth = { + .icv_truncbits = 96, + .icv_fullbits = 256, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_AALG_SHA2_256HMAC, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 256, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "hmac(sha384)", + + .uinfo = { + .auth = { + .icv_truncbits = 192, + .icv_fullbits = 384, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_AALG_SHA2_384HMAC, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 384, + .sadb_alg_maxbits = 384 + } +}, +{ + .name = "hmac(sha512)", + + .uinfo = { + .auth = { + .icv_truncbits = 256, + .icv_fullbits = 512, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_AALG_SHA2_512HMAC, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 512, + .sadb_alg_maxbits = 512 + } +}, +{ + .name = "hmac(rmd160)", + .compat = "rmd160", + + .uinfo = { + .auth = { + .icv_truncbits = 96, + .icv_fullbits = 160, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_AALG_RIPEMD160HMAC, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 160, + .sadb_alg_maxbits = 160 + } +}, +{ + .name = "xcbc(aes)", + + .uinfo = { + .auth = { + .icv_truncbits = 96, + .icv_fullbits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_AALG_AES_XCBC_MAC, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 128 + } +}, +{ + /* rfc4494 */ + .name = "cmac(aes)", + + .uinfo = { + .auth = { + .icv_truncbits = 96, + .icv_fullbits = 128, + } + }, + + .pfkey_supported = 0, +}, +}; + +static struct xfrm_algo_desc ealg_list[] = { +{ + .name = "ecb(cipher_null)", + .compat = "cipher_null", + + .uinfo = { + .encr = { + .blockbits = 8, + .defkeybits = 0, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_EALG_NULL, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 0, + .sadb_alg_maxbits = 0 + } +}, +{ + .name = "cbc(des)", + .compat = "des", + + .uinfo = { + .encr = { + .blockbits = 64, + .defkeybits = 64, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_EALG_DESCBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 64, + .sadb_alg_maxbits = 64 + } +}, +{ + .name = "cbc(des3_ede)", + .compat = "des3_ede", + + .uinfo = { + .encr = { + .blockbits = 64, + .defkeybits = 192, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_EALG_3DESCBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 192, + .sadb_alg_maxbits = 192 + } +}, +{ + .name = "cbc(cast5)", + .compat = "cast5", + + .uinfo = { + .encr = { + .blockbits = 64, + .defkeybits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_CASTCBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 40, + .sadb_alg_maxbits = 128 + } +}, +{ + .name = "cbc(blowfish)", + .compat = "blowfish", + + .uinfo = { + .encr = { + .blockbits = 64, + .defkeybits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_BLOWFISHCBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 40, + .sadb_alg_maxbits = 448 + } +}, +{ + .name = "cbc(aes)", + .compat = "aes", + + .uinfo = { + .encr = { + .blockbits = 128, + .defkeybits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AESCBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "cbc(serpent)", + .compat = "serpent", + + .uinfo = { + .encr = { + .blockbits = 128, + .defkeybits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_SERPENTCBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256, + } +}, +{ + .name = "cbc(camellia)", + .compat = "camellia", + + .uinfo = { + .encr = { + .blockbits = 128, + .defkeybits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_CAMELLIACBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "cbc(twofish)", + .compat = "twofish", + + .uinfo = { + .encr = { + .blockbits = 128, + .defkeybits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_TWOFISHCBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "rfc3686(ctr(aes))", + + .uinfo = { + .encr = { + .blockbits = 128, + .defkeybits = 160, /* 128-bit key + 32-bit nonce */ + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AESCTR, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 160, + .sadb_alg_maxbits = 288 + } +}, +}; + +static struct xfrm_algo_desc calg_list[] = { +{ + .name = "deflate", + .uinfo = { + .comp = { + .threshold = 90, + } + }, + .pfkey_supported = 1, + .desc = { .sadb_alg_id = SADB_X_CALG_DEFLATE } +}, +{ + .name = "lzs", + .uinfo = { + .comp = { + .threshold = 90, + } + }, + .pfkey_supported = 1, + .desc = { .sadb_alg_id = SADB_X_CALG_LZS } +}, +{ + .name = "lzjh", + .uinfo = { + .comp = { + .threshold = 50, + } + }, + .pfkey_supported = 1, + .desc = { .sadb_alg_id = SADB_X_CALG_LZJH } +}, +}; + +static inline int aalg_entries(void) +{ + return ARRAY_SIZE(aalg_list); +} + +static inline int ealg_entries(void) +{ + return ARRAY_SIZE(ealg_list); +} + +static inline int calg_entries(void) +{ + return ARRAY_SIZE(calg_list); +} + +struct xfrm_algo_list { + struct xfrm_algo_desc *algs; + int entries; + u32 type; + u32 mask; +}; + +static const struct xfrm_algo_list xfrm_aead_list = { + .algs = aead_list, + .entries = ARRAY_SIZE(aead_list), + .type = CRYPTO_ALG_TYPE_AEAD, + .mask = CRYPTO_ALG_TYPE_MASK, +}; + +static const struct xfrm_algo_list xfrm_aalg_list = { + .algs = aalg_list, + .entries = ARRAY_SIZE(aalg_list), + .type = CRYPTO_ALG_TYPE_HASH, + .mask = CRYPTO_ALG_TYPE_HASH_MASK, +}; + +static const struct xfrm_algo_list xfrm_ealg_list = { + .algs = ealg_list, + .entries = ARRAY_SIZE(ealg_list), + .type = CRYPTO_ALG_TYPE_BLKCIPHER, + .mask = CRYPTO_ALG_TYPE_BLKCIPHER_MASK, +}; + +static const struct xfrm_algo_list xfrm_calg_list = { + .algs = calg_list, + .entries = ARRAY_SIZE(calg_list), + .type = CRYPTO_ALG_TYPE_COMPRESS, + .mask = CRYPTO_ALG_TYPE_MASK, +}; + +static struct xfrm_algo_desc *xfrm_find_algo( + const struct xfrm_algo_list *algo_list, + int match(const struct xfrm_algo_desc *entry, const void *data), + const void *data, int probe) +{ + struct xfrm_algo_desc *list = algo_list->algs; + int i, status; + + for (i = 0; i < algo_list->entries; i++) { + if (!match(list + i, data)) + continue; + + if (list[i].available) + return &list[i]; + + if (!probe) + break; + + status = crypto_has_alg(list[i].name, algo_list->type, + algo_list->mask); + if (!status) + break; + + list[i].available = status; + return &list[i]; + } + return NULL; +} + +static int xfrm_alg_id_match(const struct xfrm_algo_desc *entry, + const void *data) +{ + return entry->desc.sadb_alg_id == (unsigned long)data; +} + +struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id) +{ + return xfrm_find_algo(&xfrm_aalg_list, xfrm_alg_id_match, + (void *)(unsigned long)alg_id, 1); +} +EXPORT_SYMBOL_GPL(xfrm_aalg_get_byid); + +struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id) +{ + return xfrm_find_algo(&xfrm_ealg_list, xfrm_alg_id_match, + (void *)(unsigned long)alg_id, 1); +} +EXPORT_SYMBOL_GPL(xfrm_ealg_get_byid); + +struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id) +{ + return xfrm_find_algo(&xfrm_calg_list, xfrm_alg_id_match, + (void *)(unsigned long)alg_id, 1); +} +EXPORT_SYMBOL_GPL(xfrm_calg_get_byid); + +static int xfrm_alg_name_match(const struct xfrm_algo_desc *entry, + const void *data) +{ + const char *name = data; + + return name && (!strcmp(name, entry->name) || + (entry->compat && !strcmp(name, entry->compat))); +} + +struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe) +{ + return xfrm_find_algo(&xfrm_aalg_list, xfrm_alg_name_match, name, + probe); +} +EXPORT_SYMBOL_GPL(xfrm_aalg_get_byname); + +struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe) +{ + return xfrm_find_algo(&xfrm_ealg_list, xfrm_alg_name_match, name, + probe); +} +EXPORT_SYMBOL_GPL(xfrm_ealg_get_byname); + +struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe) +{ + return xfrm_find_algo(&xfrm_calg_list, xfrm_alg_name_match, name, + probe); +} +EXPORT_SYMBOL_GPL(xfrm_calg_get_byname); + +struct xfrm_aead_name { + const char *name; + int icvbits; +}; + +static int xfrm_aead_name_match(const struct xfrm_algo_desc *entry, + const void *data) +{ + const struct xfrm_aead_name *aead = data; + const char *name = aead->name; + + return aead->icvbits == entry->uinfo.aead.icv_truncbits && name && + !strcmp(name, entry->name); +} + +struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, int probe) +{ + struct xfrm_aead_name data = { + .name = name, + .icvbits = icv_len, + }; + + return xfrm_find_algo(&xfrm_aead_list, xfrm_aead_name_match, &data, + probe); +} +EXPORT_SYMBOL_GPL(xfrm_aead_get_byname); + +struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx) +{ + if (idx >= aalg_entries()) + return NULL; + + return &aalg_list[idx]; +} +EXPORT_SYMBOL_GPL(xfrm_aalg_get_byidx); + +struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx) +{ + if (idx >= ealg_entries()) + return NULL; + + return &ealg_list[idx]; +} +EXPORT_SYMBOL_GPL(xfrm_ealg_get_byidx); + +/* + * Probe for the availability of crypto algorithms, and set the available + * flag for any algorithms found on the system. This is typically called by + * pfkey during userspace SA add, update or register. + */ +void xfrm_probe_algs(void) +{ + int i, status; + + BUG_ON(in_softirq()); + + for (i = 0; i < aalg_entries(); i++) { + status = crypto_has_hash(aalg_list[i].name, 0, + CRYPTO_ALG_ASYNC); + if (aalg_list[i].available != status) + aalg_list[i].available = status; + } + + for (i = 0; i < ealg_entries(); i++) { + status = crypto_has_ablkcipher(ealg_list[i].name, 0, 0); + if (ealg_list[i].available != status) + ealg_list[i].available = status; + } + + for (i = 0; i < calg_entries(); i++) { + status = crypto_has_comp(calg_list[i].name, 0, + CRYPTO_ALG_ASYNC); + if (calg_list[i].available != status) + calg_list[i].available = status; + } +} +EXPORT_SYMBOL_GPL(xfrm_probe_algs); + +int xfrm_count_pfkey_auth_supported(void) +{ + int i, n; + + for (i = 0, n = 0; i < aalg_entries(); i++) + if (aalg_list[i].available && aalg_list[i].pfkey_supported) + n++; + return n; +} +EXPORT_SYMBOL_GPL(xfrm_count_pfkey_auth_supported); + +int xfrm_count_pfkey_enc_supported(void) +{ + int i, n; + + for (i = 0, n = 0; i < ealg_entries(); i++) + if (ealg_list[i].available && ealg_list[i].pfkey_supported) + n++; + return n; +} +EXPORT_SYMBOL_GPL(xfrm_count_pfkey_enc_supported); + +MODULE_LICENSE("GPL"); diff --git a/kernel/net/xfrm/xfrm_hash.c b/kernel/net/xfrm/xfrm_hash.c new file mode 100644 index 000000000..1e98bc0fe --- /dev/null +++ b/kernel/net/xfrm/xfrm_hash.c @@ -0,0 +1,39 @@ +/* xfrm_hash.c: Common hash table code. + * + * Copyright (C) 2006 David S. Miller (davem@davemloft.net) + */ + +#include +#include +#include +#include +#include +#include + +#include "xfrm_hash.h" + +struct hlist_head *xfrm_hash_alloc(unsigned int sz) +{ + struct hlist_head *n; + + if (sz <= PAGE_SIZE) + n = kzalloc(sz, GFP_KERNEL); + else if (hashdist) + n = vzalloc(sz); + else + n = (struct hlist_head *) + __get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, + get_order(sz)); + + return n; +} + +void xfrm_hash_free(struct hlist_head *n, unsigned int sz) +{ + if (sz <= PAGE_SIZE) + kfree(n); + else if (hashdist) + vfree(n); + else + free_pages((unsigned long)n, get_order(sz)); +} diff --git a/kernel/net/xfrm/xfrm_hash.h b/kernel/net/xfrm/xfrm_hash.h new file mode 100644 index 000000000..666c5ffe9 --- /dev/null +++ b/kernel/net/xfrm/xfrm_hash.h @@ -0,0 +1,192 @@ +#ifndef _XFRM_HASH_H +#define _XFRM_HASH_H + +#include +#include +#include + +static inline unsigned int __xfrm4_addr_hash(const xfrm_address_t *addr) +{ + return ntohl(addr->a4); +} + +static inline unsigned int __xfrm6_addr_hash(const xfrm_address_t *addr) +{ + return ntohl(addr->a6[2] ^ addr->a6[3]); +} + +static inline unsigned int __xfrm4_daddr_saddr_hash(const xfrm_address_t *daddr, + const xfrm_address_t *saddr) +{ + u32 sum = (__force u32)daddr->a4 + (__force u32)saddr->a4; + return ntohl((__force __be32)sum); +} + +static inline unsigned int __xfrm6_daddr_saddr_hash(const xfrm_address_t *daddr, + const xfrm_address_t *saddr) +{ + return ntohl(daddr->a6[2] ^ daddr->a6[3] ^ + saddr->a6[2] ^ saddr->a6[3]); +} + +static inline u32 __bits2mask32(__u8 bits) +{ + u32 mask32 = 0xffffffff; + + if (bits == 0) + mask32 = 0; + else if (bits < 32) + mask32 <<= (32 - bits); + + return mask32; +} + +static inline unsigned int __xfrm4_dpref_spref_hash(const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + __u8 dbits, + __u8 sbits) +{ + return jhash_2words(ntohl(daddr->a4) & __bits2mask32(dbits), + ntohl(saddr->a4) & __bits2mask32(sbits), + 0); +} + +static inline unsigned int __xfrm6_pref_hash(const xfrm_address_t *addr, + __u8 prefixlen) +{ + int pdw; + int pbi; + u32 initval = 0; + + pdw = prefixlen >> 5; /* num of whole u32 in prefix */ + pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ + + if (pbi) { + __be32 mask; + + mask = htonl((0xffffffff) << (32 - pbi)); + + initval = (__force u32)(addr->a6[pdw] & mask); + } + + return jhash2((__force u32 *)addr->a6, pdw, initval); +} + +static inline unsigned int __xfrm6_dpref_spref_hash(const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + __u8 dbits, + __u8 sbits) +{ + return __xfrm6_pref_hash(daddr, dbits) ^ + __xfrm6_pref_hash(saddr, sbits); +} + +static inline unsigned int __xfrm_dst_hash(const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + u32 reqid, unsigned short family, + unsigned int hmask) +{ + unsigned int h = family ^ reqid; + switch (family) { + case AF_INET: + h ^= __xfrm4_daddr_saddr_hash(daddr, saddr); + break; + case AF_INET6: + h ^= __xfrm6_daddr_saddr_hash(daddr, saddr); + break; + } + return (h ^ (h >> 16)) & hmask; +} + +static inline unsigned int __xfrm_src_hash(const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + unsigned short family, + unsigned int hmask) +{ + unsigned int h = family; + switch (family) { + case AF_INET: + h ^= __xfrm4_daddr_saddr_hash(daddr, saddr); + break; + case AF_INET6: + h ^= __xfrm6_daddr_saddr_hash(daddr, saddr); + break; + } + return (h ^ (h >> 16)) & hmask; +} + +static inline unsigned int +__xfrm_spi_hash(const xfrm_address_t *daddr, __be32 spi, u8 proto, + unsigned short family, unsigned int hmask) +{ + unsigned int h = (__force u32)spi ^ proto; + switch (family) { + case AF_INET: + h ^= __xfrm4_addr_hash(daddr); + break; + case AF_INET6: + h ^= __xfrm6_addr_hash(daddr); + break; + } + return (h ^ (h >> 10) ^ (h >> 20)) & hmask; +} + +static inline unsigned int __idx_hash(u32 index, unsigned int hmask) +{ + return (index ^ (index >> 8)) & hmask; +} + +static inline unsigned int __sel_hash(const struct xfrm_selector *sel, + unsigned short family, unsigned int hmask, + u8 dbits, u8 sbits) +{ + const xfrm_address_t *daddr = &sel->daddr; + const xfrm_address_t *saddr = &sel->saddr; + unsigned int h = 0; + + switch (family) { + case AF_INET: + if (sel->prefixlen_d < dbits || + sel->prefixlen_s < sbits) + return hmask + 1; + + h = __xfrm4_dpref_spref_hash(daddr, saddr, dbits, sbits); + break; + + case AF_INET6: + if (sel->prefixlen_d < dbits || + sel->prefixlen_s < sbits) + return hmask + 1; + + h = __xfrm6_dpref_spref_hash(daddr, saddr, dbits, sbits); + break; + } + h ^= (h >> 16); + return h & hmask; +} + +static inline unsigned int __addr_hash(const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + unsigned short family, + unsigned int hmask, + u8 dbits, u8 sbits) +{ + unsigned int h = 0; + + switch (family) { + case AF_INET: + h = __xfrm4_dpref_spref_hash(daddr, saddr, dbits, sbits); + break; + + case AF_INET6: + h = __xfrm6_dpref_spref_hash(daddr, saddr, dbits, sbits); + break; + } + h ^= (h >> 16); + return h & hmask; +} + +struct hlist_head *xfrm_hash_alloc(unsigned int sz); +void xfrm_hash_free(struct hlist_head *n, unsigned int sz); + +#endif /* _XFRM_HASH_H */ diff --git a/kernel/net/xfrm/xfrm_input.c b/kernel/net/xfrm/xfrm_input.c new file mode 100644 index 000000000..b58286ecd --- /dev/null +++ b/kernel/net/xfrm/xfrm_input.c @@ -0,0 +1,396 @@ +/* + * xfrm_input.c + * + * Changes: + * YOSHIFUJI Hideaki @USAGI + * Split up af-specific portion + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +static struct kmem_cache *secpath_cachep __read_mostly; + +static DEFINE_SPINLOCK(xfrm_input_afinfo_lock); +static struct xfrm_input_afinfo __rcu *xfrm_input_afinfo[NPROTO]; + +int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo) +{ + int err = 0; + + if (unlikely(afinfo == NULL)) + return -EINVAL; + if (unlikely(afinfo->family >= NPROTO)) + return -EAFNOSUPPORT; + spin_lock_bh(&xfrm_input_afinfo_lock); + if (unlikely(xfrm_input_afinfo[afinfo->family] != NULL)) + err = -ENOBUFS; + else + rcu_assign_pointer(xfrm_input_afinfo[afinfo->family], afinfo); + spin_unlock_bh(&xfrm_input_afinfo_lock); + return err; +} +EXPORT_SYMBOL(xfrm_input_register_afinfo); + +int xfrm_input_unregister_afinfo(struct xfrm_input_afinfo *afinfo) +{ + int err = 0; + + if (unlikely(afinfo == NULL)) + return -EINVAL; + if (unlikely(afinfo->family >= NPROTO)) + return -EAFNOSUPPORT; + spin_lock_bh(&xfrm_input_afinfo_lock); + if (likely(xfrm_input_afinfo[afinfo->family] != NULL)) { + if (unlikely(xfrm_input_afinfo[afinfo->family] != afinfo)) + err = -EINVAL; + else + RCU_INIT_POINTER(xfrm_input_afinfo[afinfo->family], NULL); + } + spin_unlock_bh(&xfrm_input_afinfo_lock); + synchronize_rcu(); + return err; +} +EXPORT_SYMBOL(xfrm_input_unregister_afinfo); + +static struct xfrm_input_afinfo *xfrm_input_get_afinfo(unsigned int family) +{ + struct xfrm_input_afinfo *afinfo; + + if (unlikely(family >= NPROTO)) + return NULL; + rcu_read_lock(); + afinfo = rcu_dereference(xfrm_input_afinfo[family]); + if (unlikely(!afinfo)) + rcu_read_unlock(); + return afinfo; +} + +static void xfrm_input_put_afinfo(struct xfrm_input_afinfo *afinfo) +{ + rcu_read_unlock(); +} + +static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol, + int err) +{ + int ret; + struct xfrm_input_afinfo *afinfo = xfrm_input_get_afinfo(family); + + if (!afinfo) + return -EAFNOSUPPORT; + + ret = afinfo->callback(skb, protocol, err); + xfrm_input_put_afinfo(afinfo); + + return ret; +} + +void __secpath_destroy(struct sec_path *sp) +{ + int i; + for (i = 0; i < sp->len; i++) + xfrm_state_put(sp->xvec[i]); + kmem_cache_free(secpath_cachep, sp); +} +EXPORT_SYMBOL(__secpath_destroy); + +struct sec_path *secpath_dup(struct sec_path *src) +{ + struct sec_path *sp; + + sp = kmem_cache_alloc(secpath_cachep, GFP_ATOMIC); + if (!sp) + return NULL; + + sp->len = 0; + if (src) { + int i; + + memcpy(sp, src, sizeof(*sp)); + for (i = 0; i < sp->len; i++) + xfrm_state_hold(sp->xvec[i]); + } + atomic_set(&sp->refcnt, 1); + return sp; +} +EXPORT_SYMBOL(secpath_dup); + +/* Fetch spi and seq from ipsec header */ + +int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq) +{ + int offset, offset_seq; + int hlen; + + switch (nexthdr) { + case IPPROTO_AH: + hlen = sizeof(struct ip_auth_hdr); + offset = offsetof(struct ip_auth_hdr, spi); + offset_seq = offsetof(struct ip_auth_hdr, seq_no); + break; + case IPPROTO_ESP: + hlen = sizeof(struct ip_esp_hdr); + offset = offsetof(struct ip_esp_hdr, spi); + offset_seq = offsetof(struct ip_esp_hdr, seq_no); + break; + case IPPROTO_COMP: + if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr))) + return -EINVAL; + *spi = htonl(ntohs(*(__be16 *)(skb_transport_header(skb) + 2))); + *seq = 0; + return 0; + default: + return 1; + } + + if (!pskb_may_pull(skb, hlen)) + return -EINVAL; + + *spi = *(__be32 *)(skb_transport_header(skb) + offset); + *seq = *(__be32 *)(skb_transport_header(skb) + offset_seq); + return 0; +} + +int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb) +{ + struct xfrm_mode *inner_mode = x->inner_mode; + int err; + + err = x->outer_mode->afinfo->extract_input(x, skb); + if (err) + return err; + + if (x->sel.family == AF_UNSPEC) { + inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); + if (inner_mode == NULL) + return -EAFNOSUPPORT; + } + + skb->protocol = inner_mode->afinfo->eth_proto; + return inner_mode->input2(x, skb); +} +EXPORT_SYMBOL(xfrm_prepare_input); + +int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) +{ + struct net *net = dev_net(skb->dev); + int err; + __be32 seq; + __be32 seq_hi; + struct xfrm_state *x = NULL; + xfrm_address_t *daddr; + struct xfrm_mode *inner_mode; + u32 mark = skb->mark; + unsigned int family; + int decaps = 0; + int async = 0; + + /* A negative encap_type indicates async resumption. */ + if (encap_type < 0) { + async = 1; + x = xfrm_input_state(skb); + seq = XFRM_SKB_CB(skb)->seq.input.low; + family = x->outer_mode->afinfo->family; + goto resume; + } + + daddr = (xfrm_address_t *)(skb_network_header(skb) + + XFRM_SPI_SKB_CB(skb)->daddroff); + family = XFRM_SPI_SKB_CB(skb)->family; + + /* if tunnel is present override skb->mark value with tunnel i_key */ + if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) { + switch (family) { + case AF_INET: + mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key); + break; + case AF_INET6: + mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key); + break; + } + } + + /* Allocate new secpath or COW existing one. */ + if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) { + struct sec_path *sp; + + sp = secpath_dup(skb->sp); + if (!sp) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); + goto drop; + } + if (skb->sp) + secpath_put(skb->sp); + skb->sp = sp; + } + + seq = 0; + if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); + goto drop; + } + + do { + if (skb->sp->len == XFRM_MAX_DEPTH) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); + goto drop; + } + + x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family); + if (x == NULL) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES); + xfrm_audit_state_notfound(skb, family, spi, seq); + goto drop; + } + + skb->sp->xvec[skb->sp->len++] = x; + + spin_lock(&x->lock); + if (unlikely(x->km.state == XFRM_STATE_ACQ)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR); + goto drop_unlock; + } + + if (unlikely(x->km.state != XFRM_STATE_VALID)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEINVALID); + goto drop_unlock; + } + + if ((x->encap ? x->encap->encap_type : 0) != encap_type) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); + goto drop_unlock; + } + + if (x->repl->check(x, skb, seq)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); + goto drop_unlock; + } + + if (xfrm_state_check_expire(x)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED); + goto drop_unlock; + } + + spin_unlock(&x->lock); + + if (xfrm_tunnel_check(skb, x, family)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); + goto drop; + } + + seq_hi = htonl(xfrm_replay_seqhi(x, seq)); + + XFRM_SKB_CB(skb)->seq.input.low = seq; + XFRM_SKB_CB(skb)->seq.input.hi = seq_hi; + + skb_dst_force(skb); + + nexthdr = x->type->input(x, skb); + + if (nexthdr == -EINPROGRESS) + return 0; +resume: + spin_lock(&x->lock); + if (nexthdr <= 0) { + if (nexthdr == -EBADMSG) { + xfrm_audit_state_icvfail(x, skb, + x->type->proto); + x->stats.integrity_failed++; + } + XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); + goto drop_unlock; + } + + /* only the first xfrm gets the encap type */ + encap_type = 0; + + if (async && x->repl->recheck(x, skb, seq)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); + goto drop_unlock; + } + + x->repl->advance(x, seq); + + x->curlft.bytes += skb->len; + x->curlft.packets++; + + spin_unlock(&x->lock); + + XFRM_MODE_SKB_CB(skb)->protocol = nexthdr; + + inner_mode = x->inner_mode; + + if (x->sel.family == AF_UNSPEC) { + inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); + if (inner_mode == NULL) + goto drop; + } + + if (inner_mode->input(x, skb)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); + goto drop; + } + + if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) { + decaps = 1; + break; + } + + /* + * We need the inner address. However, we only get here for + * transport mode so the outer address is identical. + */ + daddr = &x->id.daddr; + family = x->outer_mode->afinfo->family; + + err = xfrm_parse_spi(skb, nexthdr, &spi, &seq); + if (err < 0) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); + goto drop; + } + } while (!err); + + err = xfrm_rcv_cb(skb, family, x->type->proto, 0); + if (err) + goto drop; + + nf_reset(skb); + + if (decaps) { + skb_dst_drop(skb); + netif_rx(skb); + return 0; + } else { + return x->inner_mode->afinfo->transport_finish(skb, async); + } + +drop_unlock: + spin_unlock(&x->lock); +drop: + xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1); + kfree_skb(skb); + return 0; +} +EXPORT_SYMBOL(xfrm_input); + +int xfrm_input_resume(struct sk_buff *skb, int nexthdr) +{ + return xfrm_input(skb, nexthdr, 0, -1); +} +EXPORT_SYMBOL(xfrm_input_resume); + +void __init xfrm_input_init(void) +{ + secpath_cachep = kmem_cache_create("secpath_cache", + sizeof(struct sec_path), + 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, + NULL); +} diff --git a/kernel/net/xfrm/xfrm_ipcomp.c b/kernel/net/xfrm/xfrm_ipcomp.c new file mode 100644 index 000000000..ccfdc7115 --- /dev/null +++ b/kernel/net/xfrm/xfrm_ipcomp.c @@ -0,0 +1,386 @@ +/* + * IP Payload Compression Protocol (IPComp) - RFC3173. + * + * Copyright (c) 2003 James Morris + * Copyright (c) 2003-2008 Herbert Xu + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * Todo: + * - Tunable compression parameters. + * - Compression stats. + * - Adaptive compression. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct ipcomp_tfms { + struct list_head list; + struct crypto_comp * __percpu *tfms; + int users; +}; + +static DEFINE_MUTEX(ipcomp_resource_mutex); +static void * __percpu *ipcomp_scratches; +static int ipcomp_scratch_users; +static LIST_HEAD(ipcomp_tfms_list); + +static int ipcomp_decompress(struct xfrm_state *x, struct sk_buff *skb) +{ + struct ipcomp_data *ipcd = x->data; + const int plen = skb->len; + int dlen = IPCOMP_SCRATCH_SIZE; + const u8 *start = skb->data; + const int cpu = get_cpu(); + u8 *scratch = *per_cpu_ptr(ipcomp_scratches, cpu); + struct crypto_comp *tfm = *per_cpu_ptr(ipcd->tfms, cpu); + int err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen); + int len; + + if (err) + goto out; + + if (dlen < (plen + sizeof(struct ip_comp_hdr))) { + err = -EINVAL; + goto out; + } + + len = dlen - plen; + if (len > skb_tailroom(skb)) + len = skb_tailroom(skb); + + __skb_put(skb, len); + + len += plen; + skb_copy_to_linear_data(skb, scratch, len); + + while ((scratch += len, dlen -= len) > 0) { + skb_frag_t *frag; + struct page *page; + + err = -EMSGSIZE; + if (WARN_ON(skb_shinfo(skb)->nr_frags >= MAX_SKB_FRAGS)) + goto out; + + frag = skb_shinfo(skb)->frags + skb_shinfo(skb)->nr_frags; + page = alloc_page(GFP_ATOMIC); + + err = -ENOMEM; + if (!page) + goto out; + + __skb_frag_set_page(frag, page); + + len = PAGE_SIZE; + if (dlen < len) + len = dlen; + + frag->page_offset = 0; + skb_frag_size_set(frag, len); + memcpy(skb_frag_address(frag), scratch, len); + + skb->truesize += len; + skb->data_len += len; + skb->len += len; + + skb_shinfo(skb)->nr_frags++; + } + + err = 0; + +out: + put_cpu(); + return err; +} + +int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb) +{ + int nexthdr; + int err = -ENOMEM; + struct ip_comp_hdr *ipch; + + if (skb_linearize_cow(skb)) + goto out; + + skb->ip_summed = CHECKSUM_NONE; + + /* Remove ipcomp header and decompress original payload */ + ipch = (void *)skb->data; + nexthdr = ipch->nexthdr; + + skb->transport_header = skb->network_header + sizeof(*ipch); + __skb_pull(skb, sizeof(*ipch)); + err = ipcomp_decompress(x, skb); + if (err) + goto out; + + err = nexthdr; + +out: + return err; +} +EXPORT_SYMBOL_GPL(ipcomp_input); + +static int ipcomp_compress(struct xfrm_state *x, struct sk_buff *skb) +{ + struct ipcomp_data *ipcd = x->data; + const int plen = skb->len; + int dlen = IPCOMP_SCRATCH_SIZE; + u8 *start = skb->data; + struct crypto_comp *tfm; + u8 *scratch; + int err; + + local_bh_disable(); + scratch = *this_cpu_ptr(ipcomp_scratches); + tfm = *this_cpu_ptr(ipcd->tfms); + err = crypto_comp_compress(tfm, start, plen, scratch, &dlen); + if (err) + goto out; + + if ((dlen + sizeof(struct ip_comp_hdr)) >= plen) { + err = -EMSGSIZE; + goto out; + } + + memcpy(start + sizeof(struct ip_comp_hdr), scratch, dlen); + local_bh_enable(); + + pskb_trim(skb, dlen + sizeof(struct ip_comp_hdr)); + return 0; + +out: + local_bh_enable(); + return err; +} + +int ipcomp_output(struct xfrm_state *x, struct sk_buff *skb) +{ + int err; + struct ip_comp_hdr *ipch; + struct ipcomp_data *ipcd = x->data; + + if (skb->len < ipcd->threshold) { + /* Don't bother compressing */ + goto out_ok; + } + + if (skb_linearize_cow(skb)) + goto out_ok; + + err = ipcomp_compress(x, skb); + + if (err) { + goto out_ok; + } + + /* Install ipcomp header, convert into ipcomp datagram. */ + ipch = ip_comp_hdr(skb); + ipch->nexthdr = *skb_mac_header(skb); + ipch->flags = 0; + ipch->cpi = htons((u16 )ntohl(x->id.spi)); + *skb_mac_header(skb) = IPPROTO_COMP; +out_ok: + skb_push(skb, -skb_network_offset(skb)); + return 0; +} +EXPORT_SYMBOL_GPL(ipcomp_output); + +static void ipcomp_free_scratches(void) +{ + int i; + void * __percpu *scratches; + + if (--ipcomp_scratch_users) + return; + + scratches = ipcomp_scratches; + if (!scratches) + return; + + for_each_possible_cpu(i) + vfree(*per_cpu_ptr(scratches, i)); + + free_percpu(scratches); +} + +static void * __percpu *ipcomp_alloc_scratches(void) +{ + void * __percpu *scratches; + int i; + + if (ipcomp_scratch_users++) + return ipcomp_scratches; + + scratches = alloc_percpu(void *); + if (!scratches) + return NULL; + + ipcomp_scratches = scratches; + + for_each_possible_cpu(i) { + void *scratch; + + scratch = vmalloc_node(IPCOMP_SCRATCH_SIZE, cpu_to_node(i)); + if (!scratch) + return NULL; + *per_cpu_ptr(scratches, i) = scratch; + } + + return scratches; +} + +static void ipcomp_free_tfms(struct crypto_comp * __percpu *tfms) +{ + struct ipcomp_tfms *pos; + int cpu; + + list_for_each_entry(pos, &ipcomp_tfms_list, list) { + if (pos->tfms == tfms) + break; + } + + WARN_ON(!pos); + + if (--pos->users) + return; + + list_del(&pos->list); + kfree(pos); + + if (!tfms) + return; + + for_each_possible_cpu(cpu) { + struct crypto_comp *tfm = *per_cpu_ptr(tfms, cpu); + crypto_free_comp(tfm); + } + free_percpu(tfms); +} + +static struct crypto_comp * __percpu *ipcomp_alloc_tfms(const char *alg_name) +{ + struct ipcomp_tfms *pos; + struct crypto_comp * __percpu *tfms; + int cpu; + + + list_for_each_entry(pos, &ipcomp_tfms_list, list) { + struct crypto_comp *tfm; + + /* This can be any valid CPU ID so we don't need locking. */ + tfm = __this_cpu_read(*pos->tfms); + + if (!strcmp(crypto_comp_name(tfm), alg_name)) { + pos->users++; + return pos->tfms; + } + } + + pos = kmalloc(sizeof(*pos), GFP_KERNEL); + if (!pos) + return NULL; + + pos->users = 1; + INIT_LIST_HEAD(&pos->list); + list_add(&pos->list, &ipcomp_tfms_list); + + pos->tfms = tfms = alloc_percpu(struct crypto_comp *); + if (!tfms) + goto error; + + for_each_possible_cpu(cpu) { + struct crypto_comp *tfm = crypto_alloc_comp(alg_name, 0, + CRYPTO_ALG_ASYNC); + if (IS_ERR(tfm)) + goto error; + *per_cpu_ptr(tfms, cpu) = tfm; + } + + return tfms; + +error: + ipcomp_free_tfms(tfms); + return NULL; +} + +static void ipcomp_free_data(struct ipcomp_data *ipcd) +{ + if (ipcd->tfms) + ipcomp_free_tfms(ipcd->tfms); + ipcomp_free_scratches(); +} + +void ipcomp_destroy(struct xfrm_state *x) +{ + struct ipcomp_data *ipcd = x->data; + if (!ipcd) + return; + xfrm_state_delete_tunnel(x); + mutex_lock(&ipcomp_resource_mutex); + ipcomp_free_data(ipcd); + mutex_unlock(&ipcomp_resource_mutex); + kfree(ipcd); +} +EXPORT_SYMBOL_GPL(ipcomp_destroy); + +int ipcomp_init_state(struct xfrm_state *x) +{ + int err; + struct ipcomp_data *ipcd; + struct xfrm_algo_desc *calg_desc; + + err = -EINVAL; + if (!x->calg) + goto out; + + if (x->encap) + goto out; + + err = -ENOMEM; + ipcd = kzalloc(sizeof(*ipcd), GFP_KERNEL); + if (!ipcd) + goto out; + + mutex_lock(&ipcomp_resource_mutex); + if (!ipcomp_alloc_scratches()) + goto error; + + ipcd->tfms = ipcomp_alloc_tfms(x->calg->alg_name); + if (!ipcd->tfms) + goto error; + mutex_unlock(&ipcomp_resource_mutex); + + calg_desc = xfrm_calg_get_byname(x->calg->alg_name, 0); + BUG_ON(!calg_desc); + ipcd->threshold = calg_desc->uinfo.comp.threshold; + x->data = ipcd; + err = 0; +out: + return err; + +error: + ipcomp_free_data(ipcd); + mutex_unlock(&ipcomp_resource_mutex); + kfree(ipcd); + goto out; +} +EXPORT_SYMBOL_GPL(ipcomp_init_state); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) - RFC3173"); +MODULE_AUTHOR("James Morris "); diff --git a/kernel/net/xfrm/xfrm_output.c b/kernel/net/xfrm/xfrm_output.c new file mode 100644 index 000000000..fbcedbe33 --- /dev/null +++ b/kernel/net/xfrm/xfrm_output.c @@ -0,0 +1,236 @@ +/* + * xfrm_output.c - Common IPsec encapsulation code. + * + * Copyright (c) 2007 Herbert Xu + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static int xfrm_output2(struct sock *sk, struct sk_buff *skb); + +static int xfrm_skb_check_space(struct sk_buff *skb) +{ + struct dst_entry *dst = skb_dst(skb); + int nhead = dst->header_len + LL_RESERVED_SPACE(dst->dev) + - skb_headroom(skb); + int ntail = dst->dev->needed_tailroom - skb_tailroom(skb); + + if (nhead <= 0) { + if (ntail <= 0) + return 0; + nhead = 0; + } else if (ntail < 0) + ntail = 0; + + return pskb_expand_head(skb, nhead, ntail, GFP_ATOMIC); +} + +static int xfrm_output_one(struct sk_buff *skb, int err) +{ + struct dst_entry *dst = skb_dst(skb); + struct xfrm_state *x = dst->xfrm; + struct net *net = xs_net(x); + + if (err <= 0) + goto resume; + + do { + err = xfrm_skb_check_space(skb); + if (err) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR); + goto error_nolock; + } + + err = x->outer_mode->output(x, skb); + if (err) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEMODEERROR); + goto error_nolock; + } + + spin_lock_bh(&x->lock); + + if (unlikely(x->km.state != XFRM_STATE_VALID)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEINVALID); + err = -EINVAL; + goto error; + } + + err = xfrm_state_check_expire(x); + if (err) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEEXPIRED); + goto error; + } + + err = x->repl->overflow(x, skb); + if (err) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATESEQERROR); + goto error; + } + + x->curlft.bytes += skb->len; + x->curlft.packets++; + + spin_unlock_bh(&x->lock); + + skb_dst_force(skb); + + err = x->type->output(x, skb); + if (err == -EINPROGRESS) + goto out; + +resume: + if (err) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEPROTOERROR); + goto error_nolock; + } + + dst = skb_dst_pop(skb); + if (!dst) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR); + err = -EHOSTUNREACH; + goto error_nolock; + } + skb_dst_set(skb, dst); + x = dst->xfrm; + } while (x && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL)); + + return 0; + +error: + spin_unlock_bh(&x->lock); +error_nolock: + kfree_skb(skb); +out: + return err; +} + +int xfrm_output_resume(struct sk_buff *skb, int err) +{ + while (likely((err = xfrm_output_one(skb, err)) == 0)) { + nf_reset(skb); + + err = skb_dst(skb)->ops->local_out(skb); + if (unlikely(err != 1)) + goto out; + + if (!skb_dst(skb)->xfrm) + return dst_output(skb); + + err = nf_hook(skb_dst(skb)->ops->family, + NF_INET_POST_ROUTING, skb->sk, skb, + NULL, skb_dst(skb)->dev, xfrm_output2); + if (unlikely(err != 1)) + goto out; + } + + if (err == -EINPROGRESS) + err = 0; + +out: + return err; +} +EXPORT_SYMBOL_GPL(xfrm_output_resume); + +static int xfrm_output2(struct sock *sk, struct sk_buff *skb) +{ + return xfrm_output_resume(skb, 1); +} + +static int xfrm_output_gso(struct sock *sk, struct sk_buff *skb) +{ + struct sk_buff *segs; + + segs = skb_gso_segment(skb, 0); + kfree_skb(skb); + if (IS_ERR(segs)) + return PTR_ERR(segs); + if (segs == NULL) + return -EINVAL; + + do { + struct sk_buff *nskb = segs->next; + int err; + + segs->next = NULL; + err = xfrm_output2(sk, segs); + + if (unlikely(err)) { + kfree_skb_list(nskb); + return err; + } + + segs = nskb; + } while (segs); + + return 0; +} + +int xfrm_output(struct sock *sk, struct sk_buff *skb) +{ + struct net *net = dev_net(skb_dst(skb)->dev); + int err; + + if (skb_is_gso(skb)) + return xfrm_output_gso(sk, skb); + + if (skb->ip_summed == CHECKSUM_PARTIAL) { + err = skb_checksum_help(skb); + if (err) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR); + kfree_skb(skb); + return err; + } + } + + return xfrm_output2(sk, skb); +} +EXPORT_SYMBOL_GPL(xfrm_output); + +int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb) +{ + struct xfrm_mode *inner_mode; + if (x->sel.family == AF_UNSPEC) + inner_mode = xfrm_ip2inner_mode(x, + xfrm_af2proto(skb_dst(skb)->ops->family)); + else + inner_mode = x->inner_mode; + + if (inner_mode == NULL) + return -EAFNOSUPPORT; + return inner_mode->afinfo->extract_output(x, skb); +} +EXPORT_SYMBOL_GPL(xfrm_inner_extract_output); + +void xfrm_local_error(struct sk_buff *skb, int mtu) +{ + unsigned int proto; + struct xfrm_state_afinfo *afinfo; + + if (skb->protocol == htons(ETH_P_IP)) + proto = AF_INET; + else if (skb->protocol == htons(ETH_P_IPV6)) + proto = AF_INET6; + else + return; + + afinfo = xfrm_state_get_afinfo(proto); + if (!afinfo) + return; + + afinfo->local_error(skb, mtu); + xfrm_state_put_afinfo(afinfo); +} +EXPORT_SYMBOL_GPL(xfrm_local_error); diff --git a/kernel/net/xfrm/xfrm_policy.c b/kernel/net/xfrm/xfrm_policy.c new file mode 100644 index 000000000..638af0655 --- /dev/null +++ b/kernel/net/xfrm/xfrm_policy.c @@ -0,0 +1,3397 @@ +/* + * xfrm_policy.c + * + * Changes: + * Mitsuru KANDA @USAGI + * Kazunori MIYAZAWA @USAGI + * Kunihiro Ishiguro + * IPv6 support + * Kazunori MIYAZAWA @USAGI + * YOSHIFUJI Hideaki + * Split up af-specific portion + * Derek Atkins Add the post_input processor + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#ifdef CONFIG_XFRM_STATISTICS +#include +#endif + +#include "xfrm_hash.h" + +#define XFRM_QUEUE_TMO_MIN ((unsigned)(HZ/10)) +#define XFRM_QUEUE_TMO_MAX ((unsigned)(60*HZ)) +#define XFRM_MAX_QUEUE_LEN 100 + +struct xfrm_flo { + struct dst_entry *dst_orig; + u8 flags; +}; + +static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock); +static struct xfrm_policy_afinfo __rcu *xfrm_policy_afinfo[NPROTO] + __read_mostly; + +static struct kmem_cache *xfrm_dst_cache __read_mostly; + +static void xfrm_init_pmtu(struct dst_entry *dst); +static int stale_bundle(struct dst_entry *dst); +static int xfrm_bundle_ok(struct xfrm_dst *xdst); +static void xfrm_policy_queue_process(unsigned long arg); + +static void __xfrm_policy_link(struct xfrm_policy *pol, int dir); +static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, + int dir); + +static inline bool +__xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) +{ + const struct flowi4 *fl4 = &fl->u.ip4; + + return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) && + addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) && + !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) && + !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) && + (fl4->flowi4_proto == sel->proto || !sel->proto) && + (fl4->flowi4_oif == sel->ifindex || !sel->ifindex); +} + +static inline bool +__xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) +{ + const struct flowi6 *fl6 = &fl->u.ip6; + + return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) && + addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) && + !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) && + !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) && + (fl6->flowi6_proto == sel->proto || !sel->proto) && + (fl6->flowi6_oif == sel->ifindex || !sel->ifindex); +} + +bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl, + unsigned short family) +{ + switch (family) { + case AF_INET: + return __xfrm4_selector_match(sel, fl); + case AF_INET6: + return __xfrm6_selector_match(sel, fl); + } + return false; +} + +static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) +{ + struct xfrm_policy_afinfo *afinfo; + + if (unlikely(family >= NPROTO)) + return NULL; + rcu_read_lock(); + afinfo = rcu_dereference(xfrm_policy_afinfo[family]); + if (unlikely(!afinfo)) + rcu_read_unlock(); + return afinfo; +} + +static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) +{ + rcu_read_unlock(); +} + +static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, + const xfrm_address_t *saddr, + const xfrm_address_t *daddr, + int family) +{ + struct xfrm_policy_afinfo *afinfo; + struct dst_entry *dst; + + afinfo = xfrm_policy_get_afinfo(family); + if (unlikely(afinfo == NULL)) + return ERR_PTR(-EAFNOSUPPORT); + + dst = afinfo->dst_lookup(net, tos, saddr, daddr); + + xfrm_policy_put_afinfo(afinfo); + + return dst; +} + +static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, + xfrm_address_t *prev_saddr, + xfrm_address_t *prev_daddr, + int family) +{ + struct net *net = xs_net(x); + xfrm_address_t *saddr = &x->props.saddr; + xfrm_address_t *daddr = &x->id.daddr; + struct dst_entry *dst; + + if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) { + saddr = x->coaddr; + daddr = prev_daddr; + } + if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) { + saddr = prev_saddr; + daddr = x->coaddr; + } + + dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family); + + if (!IS_ERR(dst)) { + if (prev_saddr != saddr) + memcpy(prev_saddr, saddr, sizeof(*prev_saddr)); + if (prev_daddr != daddr) + memcpy(prev_daddr, daddr, sizeof(*prev_daddr)); + } + + return dst; +} + +static inline unsigned long make_jiffies(long secs) +{ + if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) + return MAX_SCHEDULE_TIMEOUT-1; + else + return secs*HZ; +} + +static void xfrm_policy_timer(unsigned long data) +{ + struct xfrm_policy *xp = (struct xfrm_policy *)data; + unsigned long now = get_seconds(); + long next = LONG_MAX; + int warn = 0; + int dir; + + read_lock(&xp->lock); + + if (unlikely(xp->walk.dead)) + goto out; + + dir = xfrm_policy_id2dir(xp->index); + + if (xp->lft.hard_add_expires_seconds) { + long tmo = xp->lft.hard_add_expires_seconds + + xp->curlft.add_time - now; + if (tmo <= 0) + goto expired; + if (tmo < next) + next = tmo; + } + if (xp->lft.hard_use_expires_seconds) { + long tmo = xp->lft.hard_use_expires_seconds + + (xp->curlft.use_time ? : xp->curlft.add_time) - now; + if (tmo <= 0) + goto expired; + if (tmo < next) + next = tmo; + } + if (xp->lft.soft_add_expires_seconds) { + long tmo = xp->lft.soft_add_expires_seconds + + xp->curlft.add_time - now; + if (tmo <= 0) { + warn = 1; + tmo = XFRM_KM_TIMEOUT; + } + if (tmo < next) + next = tmo; + } + if (xp->lft.soft_use_expires_seconds) { + long tmo = xp->lft.soft_use_expires_seconds + + (xp->curlft.use_time ? : xp->curlft.add_time) - now; + if (tmo <= 0) { + warn = 1; + tmo = XFRM_KM_TIMEOUT; + } + if (tmo < next) + next = tmo; + } + + if (warn) + km_policy_expired(xp, dir, 0, 0); + if (next != LONG_MAX && + !mod_timer(&xp->timer, jiffies + make_jiffies(next))) + xfrm_pol_hold(xp); + +out: + read_unlock(&xp->lock); + xfrm_pol_put(xp); + return; + +expired: + read_unlock(&xp->lock); + if (!xfrm_policy_delete(xp, dir)) + km_policy_expired(xp, dir, 1, 0); + xfrm_pol_put(xp); +} + +static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo) +{ + struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); + + if (unlikely(pol->walk.dead)) + flo = NULL; + else + xfrm_pol_hold(pol); + + return flo; +} + +static int xfrm_policy_flo_check(struct flow_cache_object *flo) +{ + struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); + + return !pol->walk.dead; +} + +static void xfrm_policy_flo_delete(struct flow_cache_object *flo) +{ + xfrm_pol_put(container_of(flo, struct xfrm_policy, flo)); +} + +static const struct flow_cache_ops xfrm_policy_fc_ops = { + .get = xfrm_policy_flo_get, + .check = xfrm_policy_flo_check, + .delete = xfrm_policy_flo_delete, +}; + +/* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 + * SPD calls. + */ + +struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) +{ + struct xfrm_policy *policy; + + policy = kzalloc(sizeof(struct xfrm_policy), gfp); + + if (policy) { + write_pnet(&policy->xp_net, net); + INIT_LIST_HEAD(&policy->walk.all); + INIT_HLIST_NODE(&policy->bydst); + INIT_HLIST_NODE(&policy->byidx); + rwlock_init(&policy->lock); + atomic_set(&policy->refcnt, 1); + skb_queue_head_init(&policy->polq.hold_queue); + setup_timer(&policy->timer, xfrm_policy_timer, + (unsigned long)policy); + setup_timer(&policy->polq.hold_timer, xfrm_policy_queue_process, + (unsigned long)policy); + policy->flo.ops = &xfrm_policy_fc_ops; + } + return policy; +} +EXPORT_SYMBOL(xfrm_policy_alloc); + +/* Destroy xfrm_policy: descendant resources must be released to this moment. */ + +void xfrm_policy_destroy(struct xfrm_policy *policy) +{ + BUG_ON(!policy->walk.dead); + + if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer)) + BUG(); + + security_xfrm_policy_free(policy->security); + kfree(policy); +} +EXPORT_SYMBOL(xfrm_policy_destroy); + +static void xfrm_queue_purge(struct sk_buff_head *list) +{ + struct sk_buff *skb; + + while ((skb = skb_dequeue(list)) != NULL) + kfree_skb(skb); +} + +/* Rule must be locked. Release descentant resources, announce + * entry dead. The rule must be unlinked from lists to the moment. + */ + +static void xfrm_policy_kill(struct xfrm_policy *policy) +{ + policy->walk.dead = 1; + + atomic_inc(&policy->genid); + + if (del_timer(&policy->polq.hold_timer)) + xfrm_pol_put(policy); + xfrm_queue_purge(&policy->polq.hold_queue); + + if (del_timer(&policy->timer)) + xfrm_pol_put(policy); + + xfrm_pol_put(policy); +} + +static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; + +static inline unsigned int idx_hash(struct net *net, u32 index) +{ + return __idx_hash(index, net->xfrm.policy_idx_hmask); +} + +/* calculate policy hash thresholds */ +static void __get_hash_thresh(struct net *net, + unsigned short family, int dir, + u8 *dbits, u8 *sbits) +{ + switch (family) { + case AF_INET: + *dbits = net->xfrm.policy_bydst[dir].dbits4; + *sbits = net->xfrm.policy_bydst[dir].sbits4; + break; + + case AF_INET6: + *dbits = net->xfrm.policy_bydst[dir].dbits6; + *sbits = net->xfrm.policy_bydst[dir].sbits6; + break; + + default: + *dbits = 0; + *sbits = 0; + } +} + +static struct hlist_head *policy_hash_bysel(struct net *net, + const struct xfrm_selector *sel, + unsigned short family, int dir) +{ + unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; + unsigned int hash; + u8 dbits; + u8 sbits; + + __get_hash_thresh(net, family, dir, &dbits, &sbits); + hash = __sel_hash(sel, family, hmask, dbits, sbits); + + return (hash == hmask + 1 ? + &net->xfrm.policy_inexact[dir] : + net->xfrm.policy_bydst[dir].table + hash); +} + +static struct hlist_head *policy_hash_direct(struct net *net, + const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + unsigned short family, int dir) +{ + unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; + unsigned int hash; + u8 dbits; + u8 sbits; + + __get_hash_thresh(net, family, dir, &dbits, &sbits); + hash = __addr_hash(daddr, saddr, family, hmask, dbits, sbits); + + return net->xfrm.policy_bydst[dir].table + hash; +} + +static void xfrm_dst_hash_transfer(struct net *net, + struct hlist_head *list, + struct hlist_head *ndsttable, + unsigned int nhashmask, + int dir) +{ + struct hlist_node *tmp, *entry0 = NULL; + struct xfrm_policy *pol; + unsigned int h0 = 0; + u8 dbits; + u8 sbits; + +redo: + hlist_for_each_entry_safe(pol, tmp, list, bydst) { + unsigned int h; + + __get_hash_thresh(net, pol->family, dir, &dbits, &sbits); + h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, + pol->family, nhashmask, dbits, sbits); + if (!entry0) { + hlist_del(&pol->bydst); + hlist_add_head(&pol->bydst, ndsttable+h); + h0 = h; + } else { + if (h != h0) + continue; + hlist_del(&pol->bydst); + hlist_add_behind(&pol->bydst, entry0); + } + entry0 = &pol->bydst; + } + if (!hlist_empty(list)) { + entry0 = NULL; + goto redo; + } +} + +static void xfrm_idx_hash_transfer(struct hlist_head *list, + struct hlist_head *nidxtable, + unsigned int nhashmask) +{ + struct hlist_node *tmp; + struct xfrm_policy *pol; + + hlist_for_each_entry_safe(pol, tmp, list, byidx) { + unsigned int h; + + h = __idx_hash(pol->index, nhashmask); + hlist_add_head(&pol->byidx, nidxtable+h); + } +} + +static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) +{ + return ((old_hmask + 1) << 1) - 1; +} + +static void xfrm_bydst_resize(struct net *net, int dir) +{ + unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; + unsigned int nhashmask = xfrm_new_hash_mask(hmask); + unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); + struct hlist_head *odst = net->xfrm.policy_bydst[dir].table; + struct hlist_head *ndst = xfrm_hash_alloc(nsize); + int i; + + if (!ndst) + return; + + write_lock_bh(&net->xfrm.xfrm_policy_lock); + + for (i = hmask; i >= 0; i--) + xfrm_dst_hash_transfer(net, odst + i, ndst, nhashmask, dir); + + net->xfrm.policy_bydst[dir].table = ndst; + net->xfrm.policy_bydst[dir].hmask = nhashmask; + + write_unlock_bh(&net->xfrm.xfrm_policy_lock); + + xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); +} + +static void xfrm_byidx_resize(struct net *net, int total) +{ + unsigned int hmask = net->xfrm.policy_idx_hmask; + unsigned int nhashmask = xfrm_new_hash_mask(hmask); + unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); + struct hlist_head *oidx = net->xfrm.policy_byidx; + struct hlist_head *nidx = xfrm_hash_alloc(nsize); + int i; + + if (!nidx) + return; + + write_lock_bh(&net->xfrm.xfrm_policy_lock); + + for (i = hmask; i >= 0; i--) + xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); + + net->xfrm.policy_byidx = nidx; + net->xfrm.policy_idx_hmask = nhashmask; + + write_unlock_bh(&net->xfrm.xfrm_policy_lock); + + xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); +} + +static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total) +{ + unsigned int cnt = net->xfrm.policy_count[dir]; + unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; + + if (total) + *total += cnt; + + if ((hmask + 1) < xfrm_policy_hashmax && + cnt > hmask) + return 1; + + return 0; +} + +static inline int xfrm_byidx_should_resize(struct net *net, int total) +{ + unsigned int hmask = net->xfrm.policy_idx_hmask; + + if ((hmask + 1) < xfrm_policy_hashmax && + total > hmask) + return 1; + + return 0; +} + +void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si) +{ + read_lock_bh(&net->xfrm.xfrm_policy_lock); + si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN]; + si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT]; + si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD]; + si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; + si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; + si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; + si->spdhcnt = net->xfrm.policy_idx_hmask; + si->spdhmcnt = xfrm_policy_hashmax; + read_unlock_bh(&net->xfrm.xfrm_policy_lock); +} +EXPORT_SYMBOL(xfrm_spd_getinfo); + +static DEFINE_MUTEX(hash_resize_mutex); +static void xfrm_hash_resize(struct work_struct *work) +{ + struct net *net = container_of(work, struct net, xfrm.policy_hash_work); + int dir, total; + + mutex_lock(&hash_resize_mutex); + + total = 0; + for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { + if (xfrm_bydst_should_resize(net, dir, &total)) + xfrm_bydst_resize(net, dir); + } + if (xfrm_byidx_should_resize(net, total)) + xfrm_byidx_resize(net, total); + + mutex_unlock(&hash_resize_mutex); +} + +static void xfrm_hash_rebuild(struct work_struct *work) +{ + struct net *net = container_of(work, struct net, + xfrm.policy_hthresh.work); + unsigned int hmask; + struct xfrm_policy *pol; + struct xfrm_policy *policy; + struct hlist_head *chain; + struct hlist_head *odst; + struct hlist_node *newpos; + int i; + int dir; + unsigned seq; + u8 lbits4, rbits4, lbits6, rbits6; + + mutex_lock(&hash_resize_mutex); + + /* read selector prefixlen thresholds */ + do { + seq = read_seqbegin(&net->xfrm.policy_hthresh.lock); + + lbits4 = net->xfrm.policy_hthresh.lbits4; + rbits4 = net->xfrm.policy_hthresh.rbits4; + lbits6 = net->xfrm.policy_hthresh.lbits6; + rbits6 = net->xfrm.policy_hthresh.rbits6; + } while (read_seqretry(&net->xfrm.policy_hthresh.lock, seq)); + + write_lock_bh(&net->xfrm.xfrm_policy_lock); + + /* reset the bydst and inexact table in all directions */ + for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { + INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); + hmask = net->xfrm.policy_bydst[dir].hmask; + odst = net->xfrm.policy_bydst[dir].table; + for (i = hmask; i >= 0; i--) + INIT_HLIST_HEAD(odst + i); + if ((dir & XFRM_POLICY_MASK) == XFRM_POLICY_OUT) { + /* dir out => dst = remote, src = local */ + net->xfrm.policy_bydst[dir].dbits4 = rbits4; + net->xfrm.policy_bydst[dir].sbits4 = lbits4; + net->xfrm.policy_bydst[dir].dbits6 = rbits6; + net->xfrm.policy_bydst[dir].sbits6 = lbits6; + } else { + /* dir in/fwd => dst = local, src = remote */ + net->xfrm.policy_bydst[dir].dbits4 = lbits4; + net->xfrm.policy_bydst[dir].sbits4 = rbits4; + net->xfrm.policy_bydst[dir].dbits6 = lbits6; + net->xfrm.policy_bydst[dir].sbits6 = rbits6; + } + } + + /* re-insert all policies by order of creation */ + list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) { + newpos = NULL; + chain = policy_hash_bysel(net, &policy->selector, + policy->family, + xfrm_policy_id2dir(policy->index)); + hlist_for_each_entry(pol, chain, bydst) { + if (policy->priority >= pol->priority) + newpos = &pol->bydst; + else + break; + } + if (newpos) + hlist_add_behind(&policy->bydst, newpos); + else + hlist_add_head(&policy->bydst, chain); + } + + write_unlock_bh(&net->xfrm.xfrm_policy_lock); + + mutex_unlock(&hash_resize_mutex); +} + +void xfrm_policy_hash_rebuild(struct net *net) +{ + schedule_work(&net->xfrm.policy_hthresh.work); +} +EXPORT_SYMBOL(xfrm_policy_hash_rebuild); + +/* Generate new index... KAME seems to generate them ordered by cost + * of an absolute inpredictability of ordering of rules. This will not pass. */ +static u32 xfrm_gen_index(struct net *net, int dir, u32 index) +{ + static u32 idx_generator; + + for (;;) { + struct hlist_head *list; + struct xfrm_policy *p; + u32 idx; + int found; + + if (!index) { + idx = (idx_generator | dir); + idx_generator += 8; + } else { + idx = index; + index = 0; + } + + if (idx == 0) + idx = 8; + list = net->xfrm.policy_byidx + idx_hash(net, idx); + found = 0; + hlist_for_each_entry(p, list, byidx) { + if (p->index == idx) { + found = 1; + break; + } + } + if (!found) + return idx; + } +} + +static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) +{ + u32 *p1 = (u32 *) s1; + u32 *p2 = (u32 *) s2; + int len = sizeof(struct xfrm_selector) / sizeof(u32); + int i; + + for (i = 0; i < len; i++) { + if (p1[i] != p2[i]) + return 1; + } + + return 0; +} + +static void xfrm_policy_requeue(struct xfrm_policy *old, + struct xfrm_policy *new) +{ + struct xfrm_policy_queue *pq = &old->polq; + struct sk_buff_head list; + + __skb_queue_head_init(&list); + + spin_lock_bh(&pq->hold_queue.lock); + skb_queue_splice_init(&pq->hold_queue, &list); + if (del_timer(&pq->hold_timer)) + xfrm_pol_put(old); + spin_unlock_bh(&pq->hold_queue.lock); + + if (skb_queue_empty(&list)) + return; + + pq = &new->polq; + + spin_lock_bh(&pq->hold_queue.lock); + skb_queue_splice(&list, &pq->hold_queue); + pq->timeout = XFRM_QUEUE_TMO_MIN; + if (!mod_timer(&pq->hold_timer, jiffies)) + xfrm_pol_hold(new); + spin_unlock_bh(&pq->hold_queue.lock); +} + +static bool xfrm_policy_mark_match(struct xfrm_policy *policy, + struct xfrm_policy *pol) +{ + u32 mark = policy->mark.v & policy->mark.m; + + if (policy->mark.v == pol->mark.v && policy->mark.m == pol->mark.m) + return true; + + if ((mark & pol->mark.m) == pol->mark.v && + policy->priority == pol->priority) + return true; + + return false; +} + +int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) +{ + struct net *net = xp_net(policy); + struct xfrm_policy *pol; + struct xfrm_policy *delpol; + struct hlist_head *chain; + struct hlist_node *newpos; + + write_lock_bh(&net->xfrm.xfrm_policy_lock); + chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); + delpol = NULL; + newpos = NULL; + hlist_for_each_entry(pol, chain, bydst) { + if (pol->type == policy->type && + !selector_cmp(&pol->selector, &policy->selector) && + xfrm_policy_mark_match(policy, pol) && + xfrm_sec_ctx_match(pol->security, policy->security) && + !WARN_ON(delpol)) { + if (excl) { + write_unlock_bh(&net->xfrm.xfrm_policy_lock); + return -EEXIST; + } + delpol = pol; + if (policy->priority > pol->priority) + continue; + } else if (policy->priority >= pol->priority) { + newpos = &pol->bydst; + continue; + } + if (delpol) + break; + } + if (newpos) + hlist_add_behind(&policy->bydst, newpos); + else + hlist_add_head(&policy->bydst, chain); + __xfrm_policy_link(policy, dir); + atomic_inc(&net->xfrm.flow_cache_genid); + + /* After previous checking, family can either be AF_INET or AF_INET6 */ + if (policy->family == AF_INET) + rt_genid_bump_ipv4(net); + else + rt_genid_bump_ipv6(net); + + if (delpol) { + xfrm_policy_requeue(delpol, policy); + __xfrm_policy_unlink(delpol, dir); + } + policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index); + hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index)); + policy->curlft.add_time = get_seconds(); + policy->curlft.use_time = 0; + if (!mod_timer(&policy->timer, jiffies + HZ)) + xfrm_pol_hold(policy); + write_unlock_bh(&net->xfrm.xfrm_policy_lock); + + if (delpol) + xfrm_policy_kill(delpol); + else if (xfrm_bydst_should_resize(net, dir, NULL)) + schedule_work(&net->xfrm.policy_hash_work); + + return 0; +} +EXPORT_SYMBOL(xfrm_policy_insert); + +struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type, + int dir, struct xfrm_selector *sel, + struct xfrm_sec_ctx *ctx, int delete, + int *err) +{ + struct xfrm_policy *pol, *ret; + struct hlist_head *chain; + + *err = 0; + write_lock_bh(&net->xfrm.xfrm_policy_lock); + chain = policy_hash_bysel(net, sel, sel->family, dir); + ret = NULL; + hlist_for_each_entry(pol, chain, bydst) { + if (pol->type == type && + (mark & pol->mark.m) == pol->mark.v && + !selector_cmp(sel, &pol->selector) && + xfrm_sec_ctx_match(ctx, pol->security)) { + xfrm_pol_hold(pol); + if (delete) { + *err = security_xfrm_policy_delete( + pol->security); + if (*err) { + write_unlock_bh(&net->xfrm.xfrm_policy_lock); + return pol; + } + __xfrm_policy_unlink(pol, dir); + } + ret = pol; + break; + } + } + write_unlock_bh(&net->xfrm.xfrm_policy_lock); + + if (ret && delete) + xfrm_policy_kill(ret); + return ret; +} +EXPORT_SYMBOL(xfrm_policy_bysel_ctx); + +struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type, + int dir, u32 id, int delete, int *err) +{ + struct xfrm_policy *pol, *ret; + struct hlist_head *chain; + + *err = -ENOENT; + if (xfrm_policy_id2dir(id) != dir) + return NULL; + + *err = 0; + write_lock_bh(&net->xfrm.xfrm_policy_lock); + chain = net->xfrm.policy_byidx + idx_hash(net, id); + ret = NULL; + hlist_for_each_entry(pol, chain, byidx) { + if (pol->type == type && pol->index == id && + (mark & pol->mark.m) == pol->mark.v) { + xfrm_pol_hold(pol); + if (delete) { + *err = security_xfrm_policy_delete( + pol->security); + if (*err) { + write_unlock_bh(&net->xfrm.xfrm_policy_lock); + return pol; + } + __xfrm_policy_unlink(pol, dir); + } + ret = pol; + break; + } + } + write_unlock_bh(&net->xfrm.xfrm_policy_lock); + + if (ret && delete) + xfrm_policy_kill(ret); + return ret; +} +EXPORT_SYMBOL(xfrm_policy_byid); + +#ifdef CONFIG_SECURITY_NETWORK_XFRM +static inline int +xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid) +{ + int dir, err = 0; + + for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { + struct xfrm_policy *pol; + int i; + + hlist_for_each_entry(pol, + &net->xfrm.policy_inexact[dir], bydst) { + if (pol->type != type) + continue; + err = security_xfrm_policy_delete(pol->security); + if (err) { + xfrm_audit_policy_delete(pol, 0, task_valid); + return err; + } + } + for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { + hlist_for_each_entry(pol, + net->xfrm.policy_bydst[dir].table + i, + bydst) { + if (pol->type != type) + continue; + err = security_xfrm_policy_delete( + pol->security); + if (err) { + xfrm_audit_policy_delete(pol, 0, + task_valid); + return err; + } + } + } + } + return err; +} +#else +static inline int +xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid) +{ + return 0; +} +#endif + +int xfrm_policy_flush(struct net *net, u8 type, bool task_valid) +{ + int dir, err = 0, cnt = 0; + + write_lock_bh(&net->xfrm.xfrm_policy_lock); + + err = xfrm_policy_flush_secctx_check(net, type, task_valid); + if (err) + goto out; + + for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { + struct xfrm_policy *pol; + int i; + + again1: + hlist_for_each_entry(pol, + &net->xfrm.policy_inexact[dir], bydst) { + if (pol->type != type) + continue; + __xfrm_policy_unlink(pol, dir); + write_unlock_bh(&net->xfrm.xfrm_policy_lock); + cnt++; + + xfrm_audit_policy_delete(pol, 1, task_valid); + + xfrm_policy_kill(pol); + + write_lock_bh(&net->xfrm.xfrm_policy_lock); + goto again1; + } + + for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { + again2: + hlist_for_each_entry(pol, + net->xfrm.policy_bydst[dir].table + i, + bydst) { + if (pol->type != type) + continue; + __xfrm_policy_unlink(pol, dir); + write_unlock_bh(&net->xfrm.xfrm_policy_lock); + cnt++; + + xfrm_audit_policy_delete(pol, 1, task_valid); + xfrm_policy_kill(pol); + + write_lock_bh(&net->xfrm.xfrm_policy_lock); + goto again2; + } + } + + } + if (!cnt) + err = -ESRCH; +out: + write_unlock_bh(&net->xfrm.xfrm_policy_lock); + return err; +} +EXPORT_SYMBOL(xfrm_policy_flush); + +int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, + int (*func)(struct xfrm_policy *, int, int, void*), + void *data) +{ + struct xfrm_policy *pol; + struct xfrm_policy_walk_entry *x; + int error = 0; + + if (walk->type >= XFRM_POLICY_TYPE_MAX && + walk->type != XFRM_POLICY_TYPE_ANY) + return -EINVAL; + + if (list_empty(&walk->walk.all) && walk->seq != 0) + return 0; + + write_lock_bh(&net->xfrm.xfrm_policy_lock); + if (list_empty(&walk->walk.all)) + x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); + else + x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all); + list_for_each_entry_from(x, &net->xfrm.policy_all, all) { + if (x->dead) + continue; + pol = container_of(x, struct xfrm_policy, walk); + if (walk->type != XFRM_POLICY_TYPE_ANY && + walk->type != pol->type) + continue; + error = func(pol, xfrm_policy_id2dir(pol->index), + walk->seq, data); + if (error) { + list_move_tail(&walk->walk.all, &x->all); + goto out; + } + walk->seq++; + } + if (walk->seq == 0) { + error = -ENOENT; + goto out; + } + list_del_init(&walk->walk.all); +out: + write_unlock_bh(&net->xfrm.xfrm_policy_lock); + return error; +} +EXPORT_SYMBOL(xfrm_policy_walk); + +void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) +{ + INIT_LIST_HEAD(&walk->walk.all); + walk->walk.dead = 1; + walk->type = type; + walk->seq = 0; +} +EXPORT_SYMBOL(xfrm_policy_walk_init); + +void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net) +{ + if (list_empty(&walk->walk.all)) + return; + + write_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */ + list_del(&walk->walk.all); + write_unlock_bh(&net->xfrm.xfrm_policy_lock); +} +EXPORT_SYMBOL(xfrm_policy_walk_done); + +/* + * Find policy to apply to this flow. + * + * Returns 0 if policy found, else an -errno. + */ +static int xfrm_policy_match(const struct xfrm_policy *pol, + const struct flowi *fl, + u8 type, u16 family, int dir) +{ + const struct xfrm_selector *sel = &pol->selector; + int ret = -ESRCH; + bool match; + + if (pol->family != family || + (fl->flowi_mark & pol->mark.m) != pol->mark.v || + pol->type != type) + return ret; + + match = xfrm_selector_match(sel, fl, family); + if (match) + ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid, + dir); + + return ret; +} + +static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type, + const struct flowi *fl, + u16 family, u8 dir) +{ + int err; + struct xfrm_policy *pol, *ret; + const xfrm_address_t *daddr, *saddr; + struct hlist_head *chain; + u32 priority = ~0U; + + daddr = xfrm_flowi_daddr(fl, family); + saddr = xfrm_flowi_saddr(fl, family); + if (unlikely(!daddr || !saddr)) + return NULL; + + read_lock_bh(&net->xfrm.xfrm_policy_lock); + chain = policy_hash_direct(net, daddr, saddr, family, dir); + ret = NULL; + hlist_for_each_entry(pol, chain, bydst) { + err = xfrm_policy_match(pol, fl, type, family, dir); + if (err) { + if (err == -ESRCH) + continue; + else { + ret = ERR_PTR(err); + goto fail; + } + } else { + ret = pol; + priority = ret->priority; + break; + } + } + chain = &net->xfrm.policy_inexact[dir]; + hlist_for_each_entry(pol, chain, bydst) { + err = xfrm_policy_match(pol, fl, type, family, dir); + if (err) { + if (err == -ESRCH) + continue; + else { + ret = ERR_PTR(err); + goto fail; + } + } else if (pol->priority < priority) { + ret = pol; + break; + } + } + if (ret) + xfrm_pol_hold(ret); +fail: + read_unlock_bh(&net->xfrm.xfrm_policy_lock); + + return ret; +} + +static struct xfrm_policy * +__xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir) +{ +#ifdef CONFIG_XFRM_SUB_POLICY + struct xfrm_policy *pol; + + pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir); + if (pol != NULL) + return pol; +#endif + return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir); +} + +static int flow_to_policy_dir(int dir) +{ + if (XFRM_POLICY_IN == FLOW_DIR_IN && + XFRM_POLICY_OUT == FLOW_DIR_OUT && + XFRM_POLICY_FWD == FLOW_DIR_FWD) + return dir; + + switch (dir) { + default: + case FLOW_DIR_IN: + return XFRM_POLICY_IN; + case FLOW_DIR_OUT: + return XFRM_POLICY_OUT; + case FLOW_DIR_FWD: + return XFRM_POLICY_FWD; + } +} + +static struct flow_cache_object * +xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, + u8 dir, struct flow_cache_object *old_obj, void *ctx) +{ + struct xfrm_policy *pol; + + if (old_obj) + xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo)); + + pol = __xfrm_policy_lookup(net, fl, family, flow_to_policy_dir(dir)); + if (IS_ERR_OR_NULL(pol)) + return ERR_CAST(pol); + + /* Resolver returns two references: + * one for cache and one for caller of flow_cache_lookup() */ + xfrm_pol_hold(pol); + + return &pol->flo; +} + +static inline int policy_to_flow_dir(int dir) +{ + if (XFRM_POLICY_IN == FLOW_DIR_IN && + XFRM_POLICY_OUT == FLOW_DIR_OUT && + XFRM_POLICY_FWD == FLOW_DIR_FWD) + return dir; + switch (dir) { + default: + case XFRM_POLICY_IN: + return FLOW_DIR_IN; + case XFRM_POLICY_OUT: + return FLOW_DIR_OUT; + case XFRM_POLICY_FWD: + return FLOW_DIR_FWD; + } +} + +static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, + const struct flowi *fl) +{ + struct xfrm_policy *pol; + struct net *net = sock_net(sk); + + read_lock_bh(&net->xfrm.xfrm_policy_lock); + if ((pol = sk->sk_policy[dir]) != NULL) { + bool match = xfrm_selector_match(&pol->selector, fl, + sk->sk_family); + int err = 0; + + if (match) { + if ((sk->sk_mark & pol->mark.m) != pol->mark.v) { + pol = NULL; + goto out; + } + err = security_xfrm_policy_lookup(pol->security, + fl->flowi_secid, + policy_to_flow_dir(dir)); + if (!err) + xfrm_pol_hold(pol); + else if (err == -ESRCH) + pol = NULL; + else + pol = ERR_PTR(err); + } else + pol = NULL; + } +out: + read_unlock_bh(&net->xfrm.xfrm_policy_lock); + return pol; +} + +static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) +{ + struct net *net = xp_net(pol); + + list_add(&pol->walk.all, &net->xfrm.policy_all); + net->xfrm.policy_count[dir]++; + xfrm_pol_hold(pol); +} + +static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, + int dir) +{ + struct net *net = xp_net(pol); + + if (list_empty(&pol->walk.all)) + return NULL; + + /* Socket policies are not hashed. */ + if (!hlist_unhashed(&pol->bydst)) { + hlist_del(&pol->bydst); + hlist_del(&pol->byidx); + } + + list_del_init(&pol->walk.all); + net->xfrm.policy_count[dir]--; + + return pol; +} + +static void xfrm_sk_policy_link(struct xfrm_policy *pol, int dir) +{ + __xfrm_policy_link(pol, XFRM_POLICY_MAX + dir); +} + +static void xfrm_sk_policy_unlink(struct xfrm_policy *pol, int dir) +{ + __xfrm_policy_unlink(pol, XFRM_POLICY_MAX + dir); +} + +int xfrm_policy_delete(struct xfrm_policy *pol, int dir) +{ + struct net *net = xp_net(pol); + + write_lock_bh(&net->xfrm.xfrm_policy_lock); + pol = __xfrm_policy_unlink(pol, dir); + write_unlock_bh(&net->xfrm.xfrm_policy_lock); + if (pol) { + xfrm_policy_kill(pol); + return 0; + } + return -ENOENT; +} +EXPORT_SYMBOL(xfrm_policy_delete); + +int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) +{ + struct net *net = xp_net(pol); + struct xfrm_policy *old_pol; + +#ifdef CONFIG_XFRM_SUB_POLICY + if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) + return -EINVAL; +#endif + + write_lock_bh(&net->xfrm.xfrm_policy_lock); + old_pol = sk->sk_policy[dir]; + sk->sk_policy[dir] = pol; + if (pol) { + pol->curlft.add_time = get_seconds(); + pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0); + xfrm_sk_policy_link(pol, dir); + } + if (old_pol) { + if (pol) + xfrm_policy_requeue(old_pol, pol); + + /* Unlinking succeeds always. This is the only function + * allowed to delete or replace socket policy. + */ + xfrm_sk_policy_unlink(old_pol, dir); + } + write_unlock_bh(&net->xfrm.xfrm_policy_lock); + + if (old_pol) { + xfrm_policy_kill(old_pol); + } + return 0; +} + +static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir) +{ + struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); + struct net *net = xp_net(old); + + if (newp) { + newp->selector = old->selector; + if (security_xfrm_policy_clone(old->security, + &newp->security)) { + kfree(newp); + return NULL; /* ENOMEM */ + } + newp->lft = old->lft; + newp->curlft = old->curlft; + newp->mark = old->mark; + newp->action = old->action; + newp->flags = old->flags; + newp->xfrm_nr = old->xfrm_nr; + newp->index = old->index; + newp->type = old->type; + memcpy(newp->xfrm_vec, old->xfrm_vec, + newp->xfrm_nr*sizeof(struct xfrm_tmpl)); + write_lock_bh(&net->xfrm.xfrm_policy_lock); + xfrm_sk_policy_link(newp, dir); + write_unlock_bh(&net->xfrm.xfrm_policy_lock); + xfrm_pol_put(newp); + } + return newp; +} + +int __xfrm_sk_clone_policy(struct sock *sk) +{ + struct xfrm_policy *p0 = sk->sk_policy[0], + *p1 = sk->sk_policy[1]; + + sk->sk_policy[0] = sk->sk_policy[1] = NULL; + if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) + return -ENOMEM; + if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) + return -ENOMEM; + return 0; +} + +static int +xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote, + unsigned short family) +{ + int err; + struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); + + if (unlikely(afinfo == NULL)) + return -EINVAL; + err = afinfo->get_saddr(net, local, remote); + xfrm_policy_put_afinfo(afinfo); + return err; +} + +/* Resolve list of templates for the flow, given policy. */ + +static int +xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl, + struct xfrm_state **xfrm, unsigned short family) +{ + struct net *net = xp_net(policy); + int nx; + int i, error; + xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); + xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); + xfrm_address_t tmp; + + for (nx = 0, i = 0; i < policy->xfrm_nr; i++) { + struct xfrm_state *x; + xfrm_address_t *remote = daddr; + xfrm_address_t *local = saddr; + struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; + + if (tmpl->mode == XFRM_MODE_TUNNEL || + tmpl->mode == XFRM_MODE_BEET) { + remote = &tmpl->id.daddr; + local = &tmpl->saddr; + if (xfrm_addr_any(local, tmpl->encap_family)) { + error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family); + if (error) + goto fail; + local = &tmp; + } + } + + x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); + + if (x && x->km.state == XFRM_STATE_VALID) { + xfrm[nx++] = x; + daddr = remote; + saddr = local; + continue; + } + if (x) { + error = (x->km.state == XFRM_STATE_ERROR ? + -EINVAL : -EAGAIN); + xfrm_state_put(x); + } else if (error == -ESRCH) { + error = -EAGAIN; + } + + if (!tmpl->optional) + goto fail; + } + return nx; + +fail: + for (nx--; nx >= 0; nx--) + xfrm_state_put(xfrm[nx]); + return error; +} + +static int +xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl, + struct xfrm_state **xfrm, unsigned short family) +{ + struct xfrm_state *tp[XFRM_MAX_DEPTH]; + struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; + int cnx = 0; + int error; + int ret; + int i; + + for (i = 0; i < npols; i++) { + if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { + error = -ENOBUFS; + goto fail; + } + + ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); + if (ret < 0) { + error = ret; + goto fail; + } else + cnx += ret; + } + + /* found states are sorted for outbound processing */ + if (npols > 1) + xfrm_state_sort(xfrm, tpp, cnx, family); + + return cnx; + + fail: + for (cnx--; cnx >= 0; cnx--) + xfrm_state_put(tpp[cnx]); + return error; + +} + +/* Check that the bundle accepts the flow and its components are + * still valid. + */ + +static inline int xfrm_get_tos(const struct flowi *fl, int family) +{ + struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); + int tos; + + if (!afinfo) + return -EINVAL; + + tos = afinfo->get_tos(fl); + + xfrm_policy_put_afinfo(afinfo); + + return tos; +} + +static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo) +{ + struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); + struct dst_entry *dst = &xdst->u.dst; + + if (xdst->route == NULL) { + /* Dummy bundle - if it has xfrms we were not + * able to build bundle as template resolution failed. + * It means we need to try again resolving. */ + if (xdst->num_xfrms > 0) + return NULL; + } else if (dst->flags & DST_XFRM_QUEUE) { + return NULL; + } else { + /* Real bundle */ + if (stale_bundle(dst)) + return NULL; + } + + dst_hold(dst); + return flo; +} + +static int xfrm_bundle_flo_check(struct flow_cache_object *flo) +{ + struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); + struct dst_entry *dst = &xdst->u.dst; + + if (!xdst->route) + return 0; + if (stale_bundle(dst)) + return 0; + + return 1; +} + +static void xfrm_bundle_flo_delete(struct flow_cache_object *flo) +{ + struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); + struct dst_entry *dst = &xdst->u.dst; + + dst_free(dst); +} + +static const struct flow_cache_ops xfrm_bundle_fc_ops = { + .get = xfrm_bundle_flo_get, + .check = xfrm_bundle_flo_check, + .delete = xfrm_bundle_flo_delete, +}; + +static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family) +{ + struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); + struct dst_ops *dst_ops; + struct xfrm_dst *xdst; + + if (!afinfo) + return ERR_PTR(-EINVAL); + + switch (family) { + case AF_INET: + dst_ops = &net->xfrm.xfrm4_dst_ops; + break; +#if IS_ENABLED(CONFIG_IPV6) + case AF_INET6: + dst_ops = &net->xfrm.xfrm6_dst_ops; + break; +#endif + default: + BUG(); + } + xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0); + + if (likely(xdst)) { + struct dst_entry *dst = &xdst->u.dst; + + memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst)); + xdst->flo.ops = &xfrm_bundle_fc_ops; + if (afinfo->init_dst) + afinfo->init_dst(net, xdst); + } else + xdst = ERR_PTR(-ENOBUFS); + + xfrm_policy_put_afinfo(afinfo); + + return xdst; +} + +static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, + int nfheader_len) +{ + struct xfrm_policy_afinfo *afinfo = + xfrm_policy_get_afinfo(dst->ops->family); + int err; + + if (!afinfo) + return -EINVAL; + + err = afinfo->init_path(path, dst, nfheader_len); + + xfrm_policy_put_afinfo(afinfo); + + return err; +} + +static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, + const struct flowi *fl) +{ + struct xfrm_policy_afinfo *afinfo = + xfrm_policy_get_afinfo(xdst->u.dst.ops->family); + int err; + + if (!afinfo) + return -EINVAL; + + err = afinfo->fill_dst(xdst, dev, fl); + + xfrm_policy_put_afinfo(afinfo); + + return err; +} + + +/* Allocate chain of dst_entry's, attach known xfrm's, calculate + * all the metrics... Shortly, bundle a bundle. + */ + +static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, + struct xfrm_state **xfrm, int nx, + const struct flowi *fl, + struct dst_entry *dst) +{ + struct net *net = xp_net(policy); + unsigned long now = jiffies; + struct net_device *dev; + struct xfrm_mode *inner_mode; + struct dst_entry *dst_prev = NULL; + struct dst_entry *dst0 = NULL; + int i = 0; + int err; + int header_len = 0; + int nfheader_len = 0; + int trailer_len = 0; + int tos; + int family = policy->selector.family; + xfrm_address_t saddr, daddr; + + xfrm_flowi_addr_get(fl, &saddr, &daddr, family); + + tos = xfrm_get_tos(fl, family); + err = tos; + if (tos < 0) + goto put_states; + + dst_hold(dst); + + for (; i < nx; i++) { + struct xfrm_dst *xdst = xfrm_alloc_dst(net, family); + struct dst_entry *dst1 = &xdst->u.dst; + + err = PTR_ERR(xdst); + if (IS_ERR(xdst)) { + dst_release(dst); + goto put_states; + } + + if (xfrm[i]->sel.family == AF_UNSPEC) { + inner_mode = xfrm_ip2inner_mode(xfrm[i], + xfrm_af2proto(family)); + if (!inner_mode) { + err = -EAFNOSUPPORT; + dst_release(dst); + goto put_states; + } + } else + inner_mode = xfrm[i]->inner_mode; + + if (!dst_prev) + dst0 = dst1; + else { + dst_prev->child = dst_clone(dst1); + dst1->flags |= DST_NOHASH; + } + + xdst->route = dst; + dst_copy_metrics(dst1, dst); + + if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { + family = xfrm[i]->props.family; + dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr, + family); + err = PTR_ERR(dst); + if (IS_ERR(dst)) + goto put_states; + } else + dst_hold(dst); + + dst1->xfrm = xfrm[i]; + xdst->xfrm_genid = xfrm[i]->genid; + + dst1->obsolete = DST_OBSOLETE_FORCE_CHK; + dst1->flags |= DST_HOST; + dst1->lastuse = now; + + dst1->input = dst_discard; + dst1->output = inner_mode->afinfo->output; + + dst1->next = dst_prev; + dst_prev = dst1; + + header_len += xfrm[i]->props.header_len; + if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) + nfheader_len += xfrm[i]->props.header_len; + trailer_len += xfrm[i]->props.trailer_len; + } + + dst_prev->child = dst; + dst0->path = dst; + + err = -ENODEV; + dev = dst->dev; + if (!dev) + goto free_dst; + + xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); + xfrm_init_pmtu(dst_prev); + + for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { + struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; + + err = xfrm_fill_dst(xdst, dev, fl); + if (err) + goto free_dst; + + dst_prev->header_len = header_len; + dst_prev->trailer_len = trailer_len; + header_len -= xdst->u.dst.xfrm->props.header_len; + trailer_len -= xdst->u.dst.xfrm->props.trailer_len; + } + +out: + return dst0; + +put_states: + for (; i < nx; i++) + xfrm_state_put(xfrm[i]); +free_dst: + if (dst0) + dst_free(dst0); + dst0 = ERR_PTR(err); + goto out; +} + +#ifdef CONFIG_XFRM_SUB_POLICY +static int xfrm_dst_alloc_copy(void **target, const void *src, int size) +{ + if (!*target) { + *target = kmalloc(size, GFP_ATOMIC); + if (!*target) + return -ENOMEM; + } + + memcpy(*target, src, size); + return 0; +} +#endif + +static int xfrm_dst_update_parent(struct dst_entry *dst, + const struct xfrm_selector *sel) +{ +#ifdef CONFIG_XFRM_SUB_POLICY + struct xfrm_dst *xdst = (struct xfrm_dst *)dst; + return xfrm_dst_alloc_copy((void **)&(xdst->partner), + sel, sizeof(*sel)); +#else + return 0; +#endif +} + +static int xfrm_dst_update_origin(struct dst_entry *dst, + const struct flowi *fl) +{ +#ifdef CONFIG_XFRM_SUB_POLICY + struct xfrm_dst *xdst = (struct xfrm_dst *)dst; + return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); +#else + return 0; +#endif +} + +static int xfrm_expand_policies(const struct flowi *fl, u16 family, + struct xfrm_policy **pols, + int *num_pols, int *num_xfrms) +{ + int i; + + if (*num_pols == 0 || !pols[0]) { + *num_pols = 0; + *num_xfrms = 0; + return 0; + } + if (IS_ERR(pols[0])) + return PTR_ERR(pols[0]); + + *num_xfrms = pols[0]->xfrm_nr; + +#ifdef CONFIG_XFRM_SUB_POLICY + if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW && + pols[0]->type != XFRM_POLICY_TYPE_MAIN) { + pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]), + XFRM_POLICY_TYPE_MAIN, + fl, family, + XFRM_POLICY_OUT); + if (pols[1]) { + if (IS_ERR(pols[1])) { + xfrm_pols_put(pols, *num_pols); + return PTR_ERR(pols[1]); + } + (*num_pols)++; + (*num_xfrms) += pols[1]->xfrm_nr; + } + } +#endif + for (i = 0; i < *num_pols; i++) { + if (pols[i]->action != XFRM_POLICY_ALLOW) { + *num_xfrms = -1; + break; + } + } + + return 0; + +} + +static struct xfrm_dst * +xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols, + const struct flowi *fl, u16 family, + struct dst_entry *dst_orig) +{ + struct net *net = xp_net(pols[0]); + struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; + struct dst_entry *dst; + struct xfrm_dst *xdst; + int err; + + /* Try to instantiate a bundle */ + err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family); + if (err <= 0) { + if (err != 0 && err != -EAGAIN) + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); + return ERR_PTR(err); + } + + dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig); + if (IS_ERR(dst)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR); + return ERR_CAST(dst); + } + + xdst = (struct xfrm_dst *)dst; + xdst->num_xfrms = err; + if (num_pols > 1) + err = xfrm_dst_update_parent(dst, &pols[1]->selector); + else + err = xfrm_dst_update_origin(dst, fl); + if (unlikely(err)) { + dst_free(dst); + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); + return ERR_PTR(err); + } + + xdst->num_pols = num_pols; + memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols); + xdst->policy_genid = atomic_read(&pols[0]->genid); + + return xdst; +} + +static void xfrm_policy_queue_process(unsigned long arg) +{ + struct sk_buff *skb; + struct sock *sk; + struct dst_entry *dst; + struct xfrm_policy *pol = (struct xfrm_policy *)arg; + struct xfrm_policy_queue *pq = &pol->polq; + struct flowi fl; + struct sk_buff_head list; + + spin_lock(&pq->hold_queue.lock); + skb = skb_peek(&pq->hold_queue); + if (!skb) { + spin_unlock(&pq->hold_queue.lock); + goto out; + } + dst = skb_dst(skb); + sk = skb->sk; + xfrm_decode_session(skb, &fl, dst->ops->family); + spin_unlock(&pq->hold_queue.lock); + + dst_hold(dst->path); + dst = xfrm_lookup(xp_net(pol), dst->path, &fl, + sk, 0); + if (IS_ERR(dst)) + goto purge_queue; + + if (dst->flags & DST_XFRM_QUEUE) { + dst_release(dst); + + if (pq->timeout >= XFRM_QUEUE_TMO_MAX) + goto purge_queue; + + pq->timeout = pq->timeout << 1; + if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout)) + xfrm_pol_hold(pol); + goto out; + } + + dst_release(dst); + + __skb_queue_head_init(&list); + + spin_lock(&pq->hold_queue.lock); + pq->timeout = 0; + skb_queue_splice_init(&pq->hold_queue, &list); + spin_unlock(&pq->hold_queue.lock); + + while (!skb_queue_empty(&list)) { + skb = __skb_dequeue(&list); + + xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family); + dst_hold(skb_dst(skb)->path); + dst = xfrm_lookup(xp_net(pol), skb_dst(skb)->path, + &fl, skb->sk, 0); + if (IS_ERR(dst)) { + kfree_skb(skb); + continue; + } + + nf_reset(skb); + skb_dst_drop(skb); + skb_dst_set(skb, dst); + + dst_output(skb); + } + +out: + xfrm_pol_put(pol); + return; + +purge_queue: + pq->timeout = 0; + xfrm_queue_purge(&pq->hold_queue); + xfrm_pol_put(pol); +} + +static int xdst_queue_output(struct sock *sk, struct sk_buff *skb) +{ + unsigned long sched_next; + struct dst_entry *dst = skb_dst(skb); + struct xfrm_dst *xdst = (struct xfrm_dst *) dst; + struct xfrm_policy *pol = xdst->pols[0]; + struct xfrm_policy_queue *pq = &pol->polq; + + if (unlikely(skb_fclone_busy(sk, skb))) { + kfree_skb(skb); + return 0; + } + + if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) { + kfree_skb(skb); + return -EAGAIN; + } + + skb_dst_force(skb); + + spin_lock_bh(&pq->hold_queue.lock); + + if (!pq->timeout) + pq->timeout = XFRM_QUEUE_TMO_MIN; + + sched_next = jiffies + pq->timeout; + + if (del_timer(&pq->hold_timer)) { + if (time_before(pq->hold_timer.expires, sched_next)) + sched_next = pq->hold_timer.expires; + xfrm_pol_put(pol); + } + + __skb_queue_tail(&pq->hold_queue, skb); + if (!mod_timer(&pq->hold_timer, sched_next)) + xfrm_pol_hold(pol); + + spin_unlock_bh(&pq->hold_queue.lock); + + return 0; +} + +static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net, + struct xfrm_flo *xflo, + const struct flowi *fl, + int num_xfrms, + u16 family) +{ + int err; + struct net_device *dev; + struct dst_entry *dst; + struct dst_entry *dst1; + struct xfrm_dst *xdst; + + xdst = xfrm_alloc_dst(net, family); + if (IS_ERR(xdst)) + return xdst; + + if (!(xflo->flags & XFRM_LOOKUP_QUEUE) || + net->xfrm.sysctl_larval_drop || + num_xfrms <= 0) + return xdst; + + dst = xflo->dst_orig; + dst1 = &xdst->u.dst; + dst_hold(dst); + xdst->route = dst; + + dst_copy_metrics(dst1, dst); + + dst1->obsolete = DST_OBSOLETE_FORCE_CHK; + dst1->flags |= DST_HOST | DST_XFRM_QUEUE; + dst1->lastuse = jiffies; + + dst1->input = dst_discard; + dst1->output = xdst_queue_output; + + dst_hold(dst); + dst1->child = dst; + dst1->path = dst; + + xfrm_init_path((struct xfrm_dst *)dst1, dst, 0); + + err = -ENODEV; + dev = dst->dev; + if (!dev) + goto free_dst; + + err = xfrm_fill_dst(xdst, dev, fl); + if (err) + goto free_dst; + +out: + return xdst; + +free_dst: + dst_release(dst1); + xdst = ERR_PTR(err); + goto out; +} + +static struct flow_cache_object * +xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir, + struct flow_cache_object *oldflo, void *ctx) +{ + struct xfrm_flo *xflo = (struct xfrm_flo *)ctx; + struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; + struct xfrm_dst *xdst, *new_xdst; + int num_pols = 0, num_xfrms = 0, i, err, pol_dead; + + /* Check if the policies from old bundle are usable */ + xdst = NULL; + if (oldflo) { + xdst = container_of(oldflo, struct xfrm_dst, flo); + num_pols = xdst->num_pols; + num_xfrms = xdst->num_xfrms; + pol_dead = 0; + for (i = 0; i < num_pols; i++) { + pols[i] = xdst->pols[i]; + pol_dead |= pols[i]->walk.dead; + } + if (pol_dead) { + dst_free(&xdst->u.dst); + xdst = NULL; + num_pols = 0; + num_xfrms = 0; + oldflo = NULL; + } + } + + /* Resolve policies to use if we couldn't get them from + * previous cache entry */ + if (xdst == NULL) { + num_pols = 1; + pols[0] = __xfrm_policy_lookup(net, fl, family, + flow_to_policy_dir(dir)); + err = xfrm_expand_policies(fl, family, pols, + &num_pols, &num_xfrms); + if (err < 0) + goto inc_error; + if (num_pols == 0) + return NULL; + if (num_xfrms <= 0) + goto make_dummy_bundle; + } + + new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, + xflo->dst_orig); + if (IS_ERR(new_xdst)) { + err = PTR_ERR(new_xdst); + if (err != -EAGAIN) + goto error; + if (oldflo == NULL) + goto make_dummy_bundle; + dst_hold(&xdst->u.dst); + return oldflo; + } else if (new_xdst == NULL) { + num_xfrms = 0; + if (oldflo == NULL) + goto make_dummy_bundle; + xdst->num_xfrms = 0; + dst_hold(&xdst->u.dst); + return oldflo; + } + + /* Kill the previous bundle */ + if (xdst) { + /* The policies were stolen for newly generated bundle */ + xdst->num_pols = 0; + dst_free(&xdst->u.dst); + } + + /* Flow cache does not have reference, it dst_free()'s, + * but we do need to return one reference for original caller */ + dst_hold(&new_xdst->u.dst); + return &new_xdst->flo; + +make_dummy_bundle: + /* We found policies, but there's no bundles to instantiate: + * either because the policy blocks, has no transformations or + * we could not build template (no xfrm_states).*/ + xdst = xfrm_create_dummy_bundle(net, xflo, fl, num_xfrms, family); + if (IS_ERR(xdst)) { + xfrm_pols_put(pols, num_pols); + return ERR_CAST(xdst); + } + xdst->num_pols = num_pols; + xdst->num_xfrms = num_xfrms; + memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols); + + dst_hold(&xdst->u.dst); + return &xdst->flo; + +inc_error: + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); +error: + if (xdst != NULL) + dst_free(&xdst->u.dst); + else + xfrm_pols_put(pols, num_pols); + return ERR_PTR(err); +} + +static struct dst_entry *make_blackhole(struct net *net, u16 family, + struct dst_entry *dst_orig) +{ + struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); + struct dst_entry *ret; + + if (!afinfo) { + dst_release(dst_orig); + return ERR_PTR(-EINVAL); + } else { + ret = afinfo->blackhole_route(net, dst_orig); + } + xfrm_policy_put_afinfo(afinfo); + + return ret; +} + +/* Main function: finds/creates a bundle for given flow. + * + * At the moment we eat a raw IP route. Mostly to speed up lookups + * on interfaces with disabled IPsec. + */ +struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig, + const struct flowi *fl, + struct sock *sk, int flags) +{ + struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; + struct flow_cache_object *flo; + struct xfrm_dst *xdst; + struct dst_entry *dst, *route; + u16 family = dst_orig->ops->family; + u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); + int i, err, num_pols, num_xfrms = 0, drop_pols = 0; + + dst = NULL; + xdst = NULL; + route = NULL; + + if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { + num_pols = 1; + pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); + err = xfrm_expand_policies(fl, family, pols, + &num_pols, &num_xfrms); + if (err < 0) + goto dropdst; + + if (num_pols) { + if (num_xfrms <= 0) { + drop_pols = num_pols; + goto no_transform; + } + + xdst = xfrm_resolve_and_create_bundle( + pols, num_pols, fl, + family, dst_orig); + if (IS_ERR(xdst)) { + xfrm_pols_put(pols, num_pols); + err = PTR_ERR(xdst); + goto dropdst; + } else if (xdst == NULL) { + num_xfrms = 0; + drop_pols = num_pols; + goto no_transform; + } + + dst_hold(&xdst->u.dst); + xdst->u.dst.flags |= DST_NOCACHE; + route = xdst->route; + } + } + + if (xdst == NULL) { + struct xfrm_flo xflo; + + xflo.dst_orig = dst_orig; + xflo.flags = flags; + + /* To accelerate a bit... */ + if ((dst_orig->flags & DST_NOXFRM) || + !net->xfrm.policy_count[XFRM_POLICY_OUT]) + goto nopol; + + flo = flow_cache_lookup(net, fl, family, dir, + xfrm_bundle_lookup, &xflo); + if (flo == NULL) + goto nopol; + if (IS_ERR(flo)) { + err = PTR_ERR(flo); + goto dropdst; + } + xdst = container_of(flo, struct xfrm_dst, flo); + + num_pols = xdst->num_pols; + num_xfrms = xdst->num_xfrms; + memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols); + route = xdst->route; + } + + dst = &xdst->u.dst; + if (route == NULL && num_xfrms > 0) { + /* The only case when xfrm_bundle_lookup() returns a + * bundle with null route, is when the template could + * not be resolved. It means policies are there, but + * bundle could not be created, since we don't yet + * have the xfrm_state's. We need to wait for KM to + * negotiate new SA's or bail out with error.*/ + if (net->xfrm.sysctl_larval_drop) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); + err = -EREMOTE; + goto error; + } + + err = -EAGAIN; + + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); + goto error; + } + +no_transform: + if (num_pols == 0) + goto nopol; + + if ((flags & XFRM_LOOKUP_ICMP) && + !(pols[0]->flags & XFRM_POLICY_ICMP)) { + err = -ENOENT; + goto error; + } + + for (i = 0; i < num_pols; i++) + pols[i]->curlft.use_time = get_seconds(); + + if (num_xfrms < 0) { + /* Prohibit the flow */ + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); + err = -EPERM; + goto error; + } else if (num_xfrms > 0) { + /* Flow transformed */ + dst_release(dst_orig); + } else { + /* Flow passes untransformed */ + dst_release(dst); + dst = dst_orig; + } +ok: + xfrm_pols_put(pols, drop_pols); + if (dst && dst->xfrm && + dst->xfrm->props.mode == XFRM_MODE_TUNNEL) + dst->flags |= DST_XFRM_TUNNEL; + return dst; + +nopol: + if (!(flags & XFRM_LOOKUP_ICMP)) { + dst = dst_orig; + goto ok; + } + err = -ENOENT; +error: + dst_release(dst); +dropdst: + if (!(flags & XFRM_LOOKUP_KEEP_DST_REF)) + dst_release(dst_orig); + xfrm_pols_put(pols, drop_pols); + return ERR_PTR(err); +} +EXPORT_SYMBOL(xfrm_lookup); + +/* Callers of xfrm_lookup_route() must ensure a call to dst_output(). + * Otherwise we may send out blackholed packets. + */ +struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig, + const struct flowi *fl, + struct sock *sk, int flags) +{ + struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk, + flags | XFRM_LOOKUP_QUEUE | + XFRM_LOOKUP_KEEP_DST_REF); + + if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE) + return make_blackhole(net, dst_orig->ops->family, dst_orig); + + return dst; +} +EXPORT_SYMBOL(xfrm_lookup_route); + +static inline int +xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl) +{ + struct xfrm_state *x; + + if (!skb->sp || idx < 0 || idx >= skb->sp->len) + return 0; + x = skb->sp->xvec[idx]; + if (!x->type->reject) + return 0; + return x->type->reject(x, skb, fl); +} + +/* When skb is transformed back to its "native" form, we have to + * check policy restrictions. At the moment we make this in maximally + * stupid way. Shame on me. :-) Of course, connected sockets must + * have policy cached at them. + */ + +static inline int +xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, + unsigned short family) +{ + if (xfrm_state_kern(x)) + return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); + return x->id.proto == tmpl->id.proto && + (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && + (x->props.reqid == tmpl->reqid || !tmpl->reqid) && + x->props.mode == tmpl->mode && + (tmpl->allalgs || (tmpl->aalgos & (1<props.aalgo)) || + !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && + !(x->props.mode != XFRM_MODE_TRANSPORT && + xfrm_state_addr_cmp(tmpl, x, family)); +} + +/* + * 0 or more than 0 is returned when validation is succeeded (either bypass + * because of optional transport mode, or next index of the mathced secpath + * state with the template. + * -1 is returned when no matching template is found. + * Otherwise "-2 - errored_index" is returned. + */ +static inline int +xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start, + unsigned short family) +{ + int idx = start; + + if (tmpl->optional) { + if (tmpl->mode == XFRM_MODE_TRANSPORT) + return start; + } else + start = -1; + for (; idx < sp->len; idx++) { + if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) + return ++idx; + if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { + if (start == -1) + start = -2-idx; + break; + } + } + return start; +} + +int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, + unsigned int family, int reverse) +{ + struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); + int err; + + if (unlikely(afinfo == NULL)) + return -EAFNOSUPPORT; + + afinfo->decode_session(skb, fl, reverse); + err = security_xfrm_decode_session(skb, &fl->flowi_secid); + xfrm_policy_put_afinfo(afinfo); + return err; +} +EXPORT_SYMBOL(__xfrm_decode_session); + +static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp) +{ + for (; k < sp->len; k++) { + if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { + *idxp = k; + return 1; + } + } + + return 0; +} + +int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, + unsigned short family) +{ + struct net *net = dev_net(skb->dev); + struct xfrm_policy *pol; + struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; + int npols = 0; + int xfrm_nr; + int pi; + int reverse; + struct flowi fl; + u8 fl_dir; + int xerr_idx = -1; + + reverse = dir & ~XFRM_POLICY_MASK; + dir &= XFRM_POLICY_MASK; + fl_dir = policy_to_flow_dir(dir); + + if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); + return 0; + } + + nf_nat_decode_session(skb, &fl, family); + + /* First, check used SA against their selectors. */ + if (skb->sp) { + int i; + + for (i = skb->sp->len-1; i >= 0; i--) { + struct xfrm_state *x = skb->sp->xvec[i]; + if (!xfrm_selector_match(&x->sel, &fl, family)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); + return 0; + } + } + } + + pol = NULL; + if (sk && sk->sk_policy[dir]) { + pol = xfrm_sk_policy_lookup(sk, dir, &fl); + if (IS_ERR(pol)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); + return 0; + } + } + + if (!pol) { + struct flow_cache_object *flo; + + flo = flow_cache_lookup(net, &fl, family, fl_dir, + xfrm_policy_lookup, NULL); + if (IS_ERR_OR_NULL(flo)) + pol = ERR_CAST(flo); + else + pol = container_of(flo, struct xfrm_policy, flo); + } + + if (IS_ERR(pol)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); + return 0; + } + + if (!pol) { + if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { + xfrm_secpath_reject(xerr_idx, skb, &fl); + XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); + return 0; + } + return 1; + } + + pol->curlft.use_time = get_seconds(); + + pols[0] = pol; + npols++; +#ifdef CONFIG_XFRM_SUB_POLICY + if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { + pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, + &fl, family, + XFRM_POLICY_IN); + if (pols[1]) { + if (IS_ERR(pols[1])) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); + return 0; + } + pols[1]->curlft.use_time = get_seconds(); + npols++; + } + } +#endif + + if (pol->action == XFRM_POLICY_ALLOW) { + struct sec_path *sp; + static struct sec_path dummy; + struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; + struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; + struct xfrm_tmpl **tpp = tp; + int ti = 0; + int i, k; + + if ((sp = skb->sp) == NULL) + sp = &dummy; + + for (pi = 0; pi < npols; pi++) { + if (pols[pi] != pol && + pols[pi]->action != XFRM_POLICY_ALLOW) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); + goto reject; + } + if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); + goto reject_error; + } + for (i = 0; i < pols[pi]->xfrm_nr; i++) + tpp[ti++] = &pols[pi]->xfrm_vec[i]; + } + xfrm_nr = ti; + if (npols > 1) { + xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net); + tpp = stp; + } + + /* For each tunnel xfrm, find the first matching tmpl. + * For each tmpl before that, find corresponding xfrm. + * Order is _important_. Later we will implement + * some barriers, but at the moment barriers + * are implied between each two transformations. + */ + for (i = xfrm_nr-1, k = 0; i >= 0; i--) { + k = xfrm_policy_ok(tpp[i], sp, k, family); + if (k < 0) { + if (k < -1) + /* "-2 - errored_index" returned */ + xerr_idx = -(2+k); + XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); + goto reject; + } + } + + if (secpath_has_nontransport(sp, k, &xerr_idx)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); + goto reject; + } + + xfrm_pols_put(pols, npols); + return 1; + } + XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); + +reject: + xfrm_secpath_reject(xerr_idx, skb, &fl); +reject_error: + xfrm_pols_put(pols, npols); + return 0; +} +EXPORT_SYMBOL(__xfrm_policy_check); + +int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) +{ + struct net *net = dev_net(skb->dev); + struct flowi fl; + struct dst_entry *dst; + int res = 1; + + if (xfrm_decode_session(skb, &fl, family) < 0) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR); + return 0; + } + + skb_dst_force(skb); + + dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE); + if (IS_ERR(dst)) { + res = 0; + dst = NULL; + } + skb_dst_set(skb, dst); + return res; +} +EXPORT_SYMBOL(__xfrm_route_forward); + +/* Optimize later using cookies and generation ids. */ + +static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) +{ + /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete + * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to + * get validated by dst_ops->check on every use. We do this + * because when a normal route referenced by an XFRM dst is + * obsoleted we do not go looking around for all parent + * referencing XFRM dsts so that we can invalidate them. It + * is just too much work. Instead we make the checks here on + * every use. For example: + * + * XFRM dst A --> IPv4 dst X + * + * X is the "xdst->route" of A (X is also the "dst->path" of A + * in this example). If X is marked obsolete, "A" will not + * notice. That's what we are validating here via the + * stale_bundle() check. + * + * When a policy's bundle is pruned, we dst_free() the XFRM + * dst which causes it's ->obsolete field to be set to + * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like + * this, we want to force a new route lookup. + */ + if (dst->obsolete < 0 && !stale_bundle(dst)) + return dst; + + return NULL; +} + +static int stale_bundle(struct dst_entry *dst) +{ + return !xfrm_bundle_ok((struct xfrm_dst *)dst); +} + +void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) +{ + while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { + dst->dev = dev_net(dev)->loopback_dev; + dev_hold(dst->dev); + dev_put(dev); + } +} +EXPORT_SYMBOL(xfrm_dst_ifdown); + +static void xfrm_link_failure(struct sk_buff *skb) +{ + /* Impossible. Such dst must be popped before reaches point of failure. */ +} + +static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) +{ + if (dst) { + if (dst->obsolete) { + dst_release(dst); + dst = NULL; + } + } + return dst; +} + +void xfrm_garbage_collect(struct net *net) +{ + flow_cache_flush(net); +} +EXPORT_SYMBOL(xfrm_garbage_collect); + +static void xfrm_garbage_collect_deferred(struct net *net) +{ + flow_cache_flush_deferred(net); +} + +static void xfrm_init_pmtu(struct dst_entry *dst) +{ + do { + struct xfrm_dst *xdst = (struct xfrm_dst *)dst; + u32 pmtu, route_mtu_cached; + + pmtu = dst_mtu(dst->child); + xdst->child_mtu_cached = pmtu; + + pmtu = xfrm_state_mtu(dst->xfrm, pmtu); + + route_mtu_cached = dst_mtu(xdst->route); + xdst->route_mtu_cached = route_mtu_cached; + + if (pmtu > route_mtu_cached) + pmtu = route_mtu_cached; + + dst_metric_set(dst, RTAX_MTU, pmtu); + } while ((dst = dst->next)); +} + +/* Check that the bundle accepts the flow and its components are + * still valid. + */ + +static int xfrm_bundle_ok(struct xfrm_dst *first) +{ + struct dst_entry *dst = &first->u.dst; + struct xfrm_dst *last; + u32 mtu; + + if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || + (dst->dev && !netif_running(dst->dev))) + return 0; + + if (dst->flags & DST_XFRM_QUEUE) + return 1; + + last = NULL; + + do { + struct xfrm_dst *xdst = (struct xfrm_dst *)dst; + + if (dst->xfrm->km.state != XFRM_STATE_VALID) + return 0; + if (xdst->xfrm_genid != dst->xfrm->genid) + return 0; + if (xdst->num_pols > 0 && + xdst->policy_genid != atomic_read(&xdst->pols[0]->genid)) + return 0; + + mtu = dst_mtu(dst->child); + if (xdst->child_mtu_cached != mtu) { + last = xdst; + xdst->child_mtu_cached = mtu; + } + + if (!dst_check(xdst->route, xdst->route_cookie)) + return 0; + mtu = dst_mtu(xdst->route); + if (xdst->route_mtu_cached != mtu) { + last = xdst; + xdst->route_mtu_cached = mtu; + } + + dst = dst->child; + } while (dst->xfrm); + + if (likely(!last)) + return 1; + + mtu = last->child_mtu_cached; + for (;;) { + dst = &last->u.dst; + + mtu = xfrm_state_mtu(dst->xfrm, mtu); + if (mtu > last->route_mtu_cached) + mtu = last->route_mtu_cached; + dst_metric_set(dst, RTAX_MTU, mtu); + + if (last == first) + break; + + last = (struct xfrm_dst *)last->u.dst.next; + last->child_mtu_cached = mtu; + } + + return 1; +} + +static unsigned int xfrm_default_advmss(const struct dst_entry *dst) +{ + return dst_metric_advmss(dst->path); +} + +static unsigned int xfrm_mtu(const struct dst_entry *dst) +{ + unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); + + return mtu ? : dst_mtu(dst->path); +} + +static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst, + struct sk_buff *skb, + const void *daddr) +{ + return dst->path->ops->neigh_lookup(dst, skb, daddr); +} + +int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) +{ + struct net *net; + int err = 0; + if (unlikely(afinfo == NULL)) + return -EINVAL; + if (unlikely(afinfo->family >= NPROTO)) + return -EAFNOSUPPORT; + spin_lock(&xfrm_policy_afinfo_lock); + if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) + err = -ENOBUFS; + else { + struct dst_ops *dst_ops = afinfo->dst_ops; + if (likely(dst_ops->kmem_cachep == NULL)) + dst_ops->kmem_cachep = xfrm_dst_cache; + if (likely(dst_ops->check == NULL)) + dst_ops->check = xfrm_dst_check; + if (likely(dst_ops->default_advmss == NULL)) + dst_ops->default_advmss = xfrm_default_advmss; + if (likely(dst_ops->mtu == NULL)) + dst_ops->mtu = xfrm_mtu; + if (likely(dst_ops->negative_advice == NULL)) + dst_ops->negative_advice = xfrm_negative_advice; + if (likely(dst_ops->link_failure == NULL)) + dst_ops->link_failure = xfrm_link_failure; + if (likely(dst_ops->neigh_lookup == NULL)) + dst_ops->neigh_lookup = xfrm_neigh_lookup; + if (likely(afinfo->garbage_collect == NULL)) + afinfo->garbage_collect = xfrm_garbage_collect_deferred; + rcu_assign_pointer(xfrm_policy_afinfo[afinfo->family], afinfo); + } + spin_unlock(&xfrm_policy_afinfo_lock); + + rtnl_lock(); + for_each_net(net) { + struct dst_ops *xfrm_dst_ops; + + switch (afinfo->family) { + case AF_INET: + xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops; + break; +#if IS_ENABLED(CONFIG_IPV6) + case AF_INET6: + xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops; + break; +#endif + default: + BUG(); + } + *xfrm_dst_ops = *afinfo->dst_ops; + } + rtnl_unlock(); + + return err; +} +EXPORT_SYMBOL(xfrm_policy_register_afinfo); + +int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) +{ + int err = 0; + if (unlikely(afinfo == NULL)) + return -EINVAL; + if (unlikely(afinfo->family >= NPROTO)) + return -EAFNOSUPPORT; + spin_lock(&xfrm_policy_afinfo_lock); + if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { + if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) + err = -EINVAL; + else + RCU_INIT_POINTER(xfrm_policy_afinfo[afinfo->family], + NULL); + } + spin_unlock(&xfrm_policy_afinfo_lock); + if (!err) { + struct dst_ops *dst_ops = afinfo->dst_ops; + + synchronize_rcu(); + + dst_ops->kmem_cachep = NULL; + dst_ops->check = NULL; + dst_ops->negative_advice = NULL; + dst_ops->link_failure = NULL; + afinfo->garbage_collect = NULL; + } + return err; +} +EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); + +static void __net_init xfrm_dst_ops_init(struct net *net) +{ + struct xfrm_policy_afinfo *afinfo; + + rcu_read_lock(); + afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET]); + if (afinfo) + net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops; +#if IS_ENABLED(CONFIG_IPV6) + afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET6]); + if (afinfo) + net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops; +#endif + rcu_read_unlock(); +} + +static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) +{ + struct net_device *dev = netdev_notifier_info_to_dev(ptr); + + switch (event) { + case NETDEV_DOWN: + xfrm_garbage_collect(dev_net(dev)); + } + return NOTIFY_DONE; +} + +static struct notifier_block xfrm_dev_notifier = { + .notifier_call = xfrm_dev_event, +}; + +#ifdef CONFIG_XFRM_STATISTICS +static int __net_init xfrm_statistics_init(struct net *net) +{ + int rv; + net->mib.xfrm_statistics = alloc_percpu(struct linux_xfrm_mib); + if (!net->mib.xfrm_statistics) + return -ENOMEM; + rv = xfrm_proc_init(net); + if (rv < 0) + free_percpu(net->mib.xfrm_statistics); + return rv; +} + +static void xfrm_statistics_fini(struct net *net) +{ + xfrm_proc_fini(net); + free_percpu(net->mib.xfrm_statistics); +} +#else +static int __net_init xfrm_statistics_init(struct net *net) +{ + return 0; +} + +static void xfrm_statistics_fini(struct net *net) +{ +} +#endif + +static int __net_init xfrm_policy_init(struct net *net) +{ + unsigned int hmask, sz; + int dir; + + if (net_eq(net, &init_net)) + xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", + sizeof(struct xfrm_dst), + 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, + NULL); + + hmask = 8 - 1; + sz = (hmask+1) * sizeof(struct hlist_head); + + net->xfrm.policy_byidx = xfrm_hash_alloc(sz); + if (!net->xfrm.policy_byidx) + goto out_byidx; + net->xfrm.policy_idx_hmask = hmask; + + for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { + struct xfrm_policy_hash *htab; + + net->xfrm.policy_count[dir] = 0; + net->xfrm.policy_count[XFRM_POLICY_MAX + dir] = 0; + INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); + + htab = &net->xfrm.policy_bydst[dir]; + htab->table = xfrm_hash_alloc(sz); + if (!htab->table) + goto out_bydst; + htab->hmask = hmask; + htab->dbits4 = 32; + htab->sbits4 = 32; + htab->dbits6 = 128; + htab->sbits6 = 128; + } + net->xfrm.policy_hthresh.lbits4 = 32; + net->xfrm.policy_hthresh.rbits4 = 32; + net->xfrm.policy_hthresh.lbits6 = 128; + net->xfrm.policy_hthresh.rbits6 = 128; + + seqlock_init(&net->xfrm.policy_hthresh.lock); + + INIT_LIST_HEAD(&net->xfrm.policy_all); + INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize); + INIT_WORK(&net->xfrm.policy_hthresh.work, xfrm_hash_rebuild); + if (net_eq(net, &init_net)) + register_netdevice_notifier(&xfrm_dev_notifier); + return 0; + +out_bydst: + for (dir--; dir >= 0; dir--) { + struct xfrm_policy_hash *htab; + + htab = &net->xfrm.policy_bydst[dir]; + xfrm_hash_free(htab->table, sz); + } + xfrm_hash_free(net->xfrm.policy_byidx, sz); +out_byidx: + return -ENOMEM; +} + +static void xfrm_policy_fini(struct net *net) +{ + unsigned int sz; + int dir; + + flush_work(&net->xfrm.policy_hash_work); +#ifdef CONFIG_XFRM_SUB_POLICY + xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, false); +#endif + xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, false); + + WARN_ON(!list_empty(&net->xfrm.policy_all)); + + for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { + struct xfrm_policy_hash *htab; + + WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir])); + + htab = &net->xfrm.policy_bydst[dir]; + sz = (htab->hmask + 1) * sizeof(struct hlist_head); + WARN_ON(!hlist_empty(htab->table)); + xfrm_hash_free(htab->table, sz); + } + + sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head); + WARN_ON(!hlist_empty(net->xfrm.policy_byidx)); + xfrm_hash_free(net->xfrm.policy_byidx, sz); +} + +static int __net_init xfrm_net_init(struct net *net) +{ + int rv; + + rv = xfrm_statistics_init(net); + if (rv < 0) + goto out_statistics; + rv = xfrm_state_init(net); + if (rv < 0) + goto out_state; + rv = xfrm_policy_init(net); + if (rv < 0) + goto out_policy; + xfrm_dst_ops_init(net); + rv = xfrm_sysctl_init(net); + if (rv < 0) + goto out_sysctl; + rv = flow_cache_init(net); + if (rv < 0) + goto out; + + /* Initialize the per-net locks here */ + spin_lock_init(&net->xfrm.xfrm_state_lock); + rwlock_init(&net->xfrm.xfrm_policy_lock); + mutex_init(&net->xfrm.xfrm_cfg_mutex); + + return 0; + +out: + xfrm_sysctl_fini(net); +out_sysctl: + xfrm_policy_fini(net); +out_policy: + xfrm_state_fini(net); +out_state: + xfrm_statistics_fini(net); +out_statistics: + return rv; +} + +static void __net_exit xfrm_net_exit(struct net *net) +{ + flow_cache_fini(net); + xfrm_sysctl_fini(net); + xfrm_policy_fini(net); + xfrm_state_fini(net); + xfrm_statistics_fini(net); +} + +static struct pernet_operations __net_initdata xfrm_net_ops = { + .init = xfrm_net_init, + .exit = xfrm_net_exit, +}; + +void __init xfrm_init(void) +{ + register_pernet_subsys(&xfrm_net_ops); + xfrm_input_init(); +} + +#ifdef CONFIG_AUDITSYSCALL +static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, + struct audit_buffer *audit_buf) +{ + struct xfrm_sec_ctx *ctx = xp->security; + struct xfrm_selector *sel = &xp->selector; + + if (ctx) + audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", + ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); + + switch (sel->family) { + case AF_INET: + audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); + if (sel->prefixlen_s != 32) + audit_log_format(audit_buf, " src_prefixlen=%d", + sel->prefixlen_s); + audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); + if (sel->prefixlen_d != 32) + audit_log_format(audit_buf, " dst_prefixlen=%d", + sel->prefixlen_d); + break; + case AF_INET6: + audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); + if (sel->prefixlen_s != 128) + audit_log_format(audit_buf, " src_prefixlen=%d", + sel->prefixlen_s); + audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); + if (sel->prefixlen_d != 128) + audit_log_format(audit_buf, " dst_prefixlen=%d", + sel->prefixlen_d); + break; + } +} + +void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid) +{ + struct audit_buffer *audit_buf; + + audit_buf = xfrm_audit_start("SPD-add"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_usrinfo(task_valid, audit_buf); + audit_log_format(audit_buf, " res=%u", result); + xfrm_audit_common_policyinfo(xp, audit_buf); + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); + +void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, + bool task_valid) +{ + struct audit_buffer *audit_buf; + + audit_buf = xfrm_audit_start("SPD-delete"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_usrinfo(task_valid, audit_buf); + audit_log_format(audit_buf, " res=%u", result); + xfrm_audit_common_policyinfo(xp, audit_buf); + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); +#endif + +#ifdef CONFIG_XFRM_MIGRATE +static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp, + const struct xfrm_selector *sel_tgt) +{ + if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { + if (sel_tgt->family == sel_cmp->family && + xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr, + sel_cmp->family) && + xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr, + sel_cmp->family) && + sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && + sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { + return true; + } + } else { + if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { + return true; + } + } + return false; +} + +static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel, + u8 dir, u8 type, struct net *net) +{ + struct xfrm_policy *pol, *ret = NULL; + struct hlist_head *chain; + u32 priority = ~0U; + + read_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME*/ + chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir); + hlist_for_each_entry(pol, chain, bydst) { + if (xfrm_migrate_selector_match(sel, &pol->selector) && + pol->type == type) { + ret = pol; + priority = ret->priority; + break; + } + } + chain = &net->xfrm.policy_inexact[dir]; + hlist_for_each_entry(pol, chain, bydst) { + if (xfrm_migrate_selector_match(sel, &pol->selector) && + pol->type == type && + pol->priority < priority) { + ret = pol; + break; + } + } + + if (ret) + xfrm_pol_hold(ret); + + read_unlock_bh(&net->xfrm.xfrm_policy_lock); + + return ret; +} + +static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t) +{ + int match = 0; + + if (t->mode == m->mode && t->id.proto == m->proto && + (m->reqid == 0 || t->reqid == m->reqid)) { + switch (t->mode) { + case XFRM_MODE_TUNNEL: + case XFRM_MODE_BEET: + if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr, + m->old_family) && + xfrm_addr_equal(&t->saddr, &m->old_saddr, + m->old_family)) { + match = 1; + } + break; + case XFRM_MODE_TRANSPORT: + /* in case of transport mode, template does not store + any IP addresses, hence we just compare mode and + protocol */ + match = 1; + break; + default: + break; + } + } + return match; +} + +/* update endpoint address(es) of template(s) */ +static int xfrm_policy_migrate(struct xfrm_policy *pol, + struct xfrm_migrate *m, int num_migrate) +{ + struct xfrm_migrate *mp; + int i, j, n = 0; + + write_lock_bh(&pol->lock); + if (unlikely(pol->walk.dead)) { + /* target policy has been deleted */ + write_unlock_bh(&pol->lock); + return -ENOENT; + } + + for (i = 0; i < pol->xfrm_nr; i++) { + for (j = 0, mp = m; j < num_migrate; j++, mp++) { + if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) + continue; + n++; + if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && + pol->xfrm_vec[i].mode != XFRM_MODE_BEET) + continue; + /* update endpoints */ + memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, + sizeof(pol->xfrm_vec[i].id.daddr)); + memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, + sizeof(pol->xfrm_vec[i].saddr)); + pol->xfrm_vec[i].encap_family = mp->new_family; + /* flush bundles */ + atomic_inc(&pol->genid); + } + } + + write_unlock_bh(&pol->lock); + + if (!n) + return -ENODATA; + + return 0; +} + +static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate) +{ + int i, j; + + if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) + return -EINVAL; + + for (i = 0; i < num_migrate; i++) { + if (xfrm_addr_equal(&m[i].old_daddr, &m[i].new_daddr, + m[i].old_family) && + xfrm_addr_equal(&m[i].old_saddr, &m[i].new_saddr, + m[i].old_family)) + return -EINVAL; + if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || + xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) + return -EINVAL; + + /* check if there is any duplicated entry */ + for (j = i + 1; j < num_migrate; j++) { + if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, + sizeof(m[i].old_daddr)) && + !memcmp(&m[i].old_saddr, &m[j].old_saddr, + sizeof(m[i].old_saddr)) && + m[i].proto == m[j].proto && + m[i].mode == m[j].mode && + m[i].reqid == m[j].reqid && + m[i].old_family == m[j].old_family) + return -EINVAL; + } + } + + return 0; +} + +int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, + struct xfrm_migrate *m, int num_migrate, + struct xfrm_kmaddress *k, struct net *net) +{ + int i, err, nx_cur = 0, nx_new = 0; + struct xfrm_policy *pol = NULL; + struct xfrm_state *x, *xc; + struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; + struct xfrm_state *x_new[XFRM_MAX_DEPTH]; + struct xfrm_migrate *mp; + + if ((err = xfrm_migrate_check(m, num_migrate)) < 0) + goto out; + + /* Stage 1 - find policy */ + if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) { + err = -ENOENT; + goto out; + } + + /* Stage 2 - find and update state(s) */ + for (i = 0, mp = m; i < num_migrate; i++, mp++) { + if ((x = xfrm_migrate_state_find(mp, net))) { + x_cur[nx_cur] = x; + nx_cur++; + if ((xc = xfrm_state_migrate(x, mp))) { + x_new[nx_new] = xc; + nx_new++; + } else { + err = -ENODATA; + goto restore_state; + } + } + } + + /* Stage 3 - update policy */ + if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) + goto restore_state; + + /* Stage 4 - delete old state(s) */ + if (nx_cur) { + xfrm_states_put(x_cur, nx_cur); + xfrm_states_delete(x_cur, nx_cur); + } + + /* Stage 5 - announce */ + km_migrate(sel, dir, type, m, num_migrate, k); + + xfrm_pol_put(pol); + + return 0; +out: + return err; + +restore_state: + if (pol) + xfrm_pol_put(pol); + if (nx_cur) + xfrm_states_put(x_cur, nx_cur); + if (nx_new) + xfrm_states_delete(x_new, nx_new); + + return err; +} +EXPORT_SYMBOL(xfrm_migrate); +#endif diff --git a/kernel/net/xfrm/xfrm_proc.c b/kernel/net/xfrm/xfrm_proc.c new file mode 100644 index 000000000..9c4fbd893 --- /dev/null +++ b/kernel/net/xfrm/xfrm_proc.c @@ -0,0 +1,86 @@ +/* + * xfrm_proc.c + * + * Copyright (C)2006-2007 USAGI/WIDE Project + * + * Authors: Masahide NAKAMURA + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ +#include +#include +#include +#include +#include + +static const struct snmp_mib xfrm_mib_list[] = { + SNMP_MIB_ITEM("XfrmInError", LINUX_MIB_XFRMINERROR), + SNMP_MIB_ITEM("XfrmInBufferError", LINUX_MIB_XFRMINBUFFERERROR), + SNMP_MIB_ITEM("XfrmInHdrError", LINUX_MIB_XFRMINHDRERROR), + SNMP_MIB_ITEM("XfrmInNoStates", LINUX_MIB_XFRMINNOSTATES), + SNMP_MIB_ITEM("XfrmInStateProtoError", LINUX_MIB_XFRMINSTATEPROTOERROR), + SNMP_MIB_ITEM("XfrmInStateModeError", LINUX_MIB_XFRMINSTATEMODEERROR), + SNMP_MIB_ITEM("XfrmInStateSeqError", LINUX_MIB_XFRMINSTATESEQERROR), + SNMP_MIB_ITEM("XfrmInStateExpired", LINUX_MIB_XFRMINSTATEEXPIRED), + SNMP_MIB_ITEM("XfrmInStateMismatch", LINUX_MIB_XFRMINSTATEMISMATCH), + SNMP_MIB_ITEM("XfrmInStateInvalid", LINUX_MIB_XFRMINSTATEINVALID), + SNMP_MIB_ITEM("XfrmInTmplMismatch", LINUX_MIB_XFRMINTMPLMISMATCH), + SNMP_MIB_ITEM("XfrmInNoPols", LINUX_MIB_XFRMINNOPOLS), + SNMP_MIB_ITEM("XfrmInPolBlock", LINUX_MIB_XFRMINPOLBLOCK), + SNMP_MIB_ITEM("XfrmInPolError", LINUX_MIB_XFRMINPOLERROR), + SNMP_MIB_ITEM("XfrmOutError", LINUX_MIB_XFRMOUTERROR), + SNMP_MIB_ITEM("XfrmOutBundleGenError", LINUX_MIB_XFRMOUTBUNDLEGENERROR), + SNMP_MIB_ITEM("XfrmOutBundleCheckError", LINUX_MIB_XFRMOUTBUNDLECHECKERROR), + SNMP_MIB_ITEM("XfrmOutNoStates", LINUX_MIB_XFRMOUTNOSTATES), + SNMP_MIB_ITEM("XfrmOutStateProtoError", LINUX_MIB_XFRMOUTSTATEPROTOERROR), + SNMP_MIB_ITEM("XfrmOutStateModeError", LINUX_MIB_XFRMOUTSTATEMODEERROR), + SNMP_MIB_ITEM("XfrmOutStateSeqError", LINUX_MIB_XFRMOUTSTATESEQERROR), + SNMP_MIB_ITEM("XfrmOutStateExpired", LINUX_MIB_XFRMOUTSTATEEXPIRED), + SNMP_MIB_ITEM("XfrmOutPolBlock", LINUX_MIB_XFRMOUTPOLBLOCK), + SNMP_MIB_ITEM("XfrmOutPolDead", LINUX_MIB_XFRMOUTPOLDEAD), + SNMP_MIB_ITEM("XfrmOutPolError", LINUX_MIB_XFRMOUTPOLERROR), + SNMP_MIB_ITEM("XfrmFwdHdrError", LINUX_MIB_XFRMFWDHDRERROR), + SNMP_MIB_ITEM("XfrmOutStateInvalid", LINUX_MIB_XFRMOUTSTATEINVALID), + SNMP_MIB_ITEM("XfrmAcquireError", LINUX_MIB_XFRMACQUIREERROR), + SNMP_MIB_SENTINEL +}; + +static int xfrm_statistics_seq_show(struct seq_file *seq, void *v) +{ + struct net *net = seq->private; + int i; + for (i = 0; xfrm_mib_list[i].name; i++) + seq_printf(seq, "%-24s\t%lu\n", xfrm_mib_list[i].name, + snmp_fold_field(net->mib.xfrm_statistics, + xfrm_mib_list[i].entry)); + return 0; +} + +static int xfrm_statistics_seq_open(struct inode *inode, struct file *file) +{ + return single_open_net(inode, file, xfrm_statistics_seq_show); +} + +static const struct file_operations xfrm_statistics_seq_fops = { + .owner = THIS_MODULE, + .open = xfrm_statistics_seq_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release_net, +}; + +int __net_init xfrm_proc_init(struct net *net) +{ + if (!proc_create("xfrm_stat", S_IRUGO, net->proc_net, + &xfrm_statistics_seq_fops)) + return -ENOMEM; + return 0; +} + +void xfrm_proc_fini(struct net *net) +{ + remove_proc_entry("xfrm_stat", net->proc_net); +} diff --git a/kernel/net/xfrm/xfrm_replay.c b/kernel/net/xfrm/xfrm_replay.c new file mode 100644 index 000000000..4fd725a0c --- /dev/null +++ b/kernel/net/xfrm/xfrm_replay.c @@ -0,0 +1,605 @@ +/* + * xfrm_replay.c - xfrm replay detection, derived from xfrm_state.c. + * + * Copyright (C) 2010 secunet Security Networks AG + * Copyright (C) 2010 Steffen Klassert + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include +#include + +u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq) +{ + u32 seq, seq_hi, bottom; + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + + if (!(x->props.flags & XFRM_STATE_ESN)) + return 0; + + seq = ntohl(net_seq); + seq_hi = replay_esn->seq_hi; + bottom = replay_esn->seq - replay_esn->replay_window + 1; + + if (likely(replay_esn->seq >= replay_esn->replay_window - 1)) { + /* A. same subspace */ + if (unlikely(seq < bottom)) + seq_hi++; + } else { + /* B. window spans two subspaces */ + if (unlikely(seq >= bottom)) + seq_hi--; + } + + return seq_hi; +} + +static void xfrm_replay_notify(struct xfrm_state *x, int event) +{ + struct km_event c; + /* we send notify messages in case + * 1. we updated on of the sequence numbers, and the seqno difference + * is at least x->replay_maxdiff, in this case we also update the + * timeout of our timer function + * 2. if x->replay_maxage has elapsed since last update, + * and there were changes + * + * The state structure must be locked! + */ + + switch (event) { + case XFRM_REPLAY_UPDATE: + if (!x->replay_maxdiff || + ((x->replay.seq - x->preplay.seq < x->replay_maxdiff) && + (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff))) { + if (x->xflags & XFRM_TIME_DEFER) + event = XFRM_REPLAY_TIMEOUT; + else + return; + } + + break; + + case XFRM_REPLAY_TIMEOUT: + if (memcmp(&x->replay, &x->preplay, + sizeof(struct xfrm_replay_state)) == 0) { + x->xflags |= XFRM_TIME_DEFER; + return; + } + + break; + } + + memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state)); + c.event = XFRM_MSG_NEWAE; + c.data.aevent = event; + km_state_notify(x, &c); + + if (x->replay_maxage && + !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) + x->xflags &= ~XFRM_TIME_DEFER; +} + +static int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb) +{ + int err = 0; + struct net *net = xs_net(x); + + if (x->type->flags & XFRM_TYPE_REPLAY_PROT) { + XFRM_SKB_CB(skb)->seq.output.low = ++x->replay.oseq; + XFRM_SKB_CB(skb)->seq.output.hi = 0; + if (unlikely(x->replay.oseq == 0)) { + x->replay.oseq--; + xfrm_audit_state_replay_overflow(x, skb); + err = -EOVERFLOW; + + return err; + } + if (xfrm_aevent_is_on(net)) + x->repl->notify(x, XFRM_REPLAY_UPDATE); + } + + return err; +} + +static int xfrm_replay_check(struct xfrm_state *x, + struct sk_buff *skb, __be32 net_seq) +{ + u32 diff; + u32 seq = ntohl(net_seq); + + if (!x->props.replay_window) + return 0; + + if (unlikely(seq == 0)) + goto err; + + if (likely(seq > x->replay.seq)) + return 0; + + diff = x->replay.seq - seq; + if (diff >= x->props.replay_window) { + x->stats.replay_window++; + goto err; + } + + if (x->replay.bitmap & (1U << diff)) { + x->stats.replay++; + goto err; + } + return 0; + +err: + xfrm_audit_state_replay(x, skb, net_seq); + return -EINVAL; +} + +static void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq) +{ + u32 diff; + u32 seq = ntohl(net_seq); + + if (!x->props.replay_window) + return; + + if (seq > x->replay.seq) { + diff = seq - x->replay.seq; + if (diff < x->props.replay_window) + x->replay.bitmap = ((x->replay.bitmap) << diff) | 1; + else + x->replay.bitmap = 1; + x->replay.seq = seq; + } else { + diff = x->replay.seq - seq; + x->replay.bitmap |= (1U << diff); + } + + if (xfrm_aevent_is_on(xs_net(x))) + x->repl->notify(x, XFRM_REPLAY_UPDATE); +} + +static int xfrm_replay_overflow_bmp(struct xfrm_state *x, struct sk_buff *skb) +{ + int err = 0; + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + struct net *net = xs_net(x); + + if (x->type->flags & XFRM_TYPE_REPLAY_PROT) { + XFRM_SKB_CB(skb)->seq.output.low = ++replay_esn->oseq; + XFRM_SKB_CB(skb)->seq.output.hi = 0; + if (unlikely(replay_esn->oseq == 0)) { + replay_esn->oseq--; + xfrm_audit_state_replay_overflow(x, skb); + err = -EOVERFLOW; + + return err; + } + if (xfrm_aevent_is_on(net)) + x->repl->notify(x, XFRM_REPLAY_UPDATE); + } + + return err; +} + +static int xfrm_replay_check_bmp(struct xfrm_state *x, + struct sk_buff *skb, __be32 net_seq) +{ + unsigned int bitnr, nr; + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + u32 pos; + u32 seq = ntohl(net_seq); + u32 diff = replay_esn->seq - seq; + + if (!replay_esn->replay_window) + return 0; + + if (unlikely(seq == 0)) + goto err; + + if (likely(seq > replay_esn->seq)) + return 0; + + if (diff >= replay_esn->replay_window) { + x->stats.replay_window++; + goto err; + } + + pos = (replay_esn->seq - 1) % replay_esn->replay_window; + + if (pos >= diff) + bitnr = (pos - diff) % replay_esn->replay_window; + else + bitnr = replay_esn->replay_window - (diff - pos); + + nr = bitnr >> 5; + bitnr = bitnr & 0x1F; + if (replay_esn->bmp[nr] & (1U << bitnr)) + goto err_replay; + + return 0; + +err_replay: + x->stats.replay++; +err: + xfrm_audit_state_replay(x, skb, net_seq); + return -EINVAL; +} + +static void xfrm_replay_advance_bmp(struct xfrm_state *x, __be32 net_seq) +{ + unsigned int bitnr, nr, i; + u32 diff; + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + u32 seq = ntohl(net_seq); + u32 pos; + + if (!replay_esn->replay_window) + return; + + pos = (replay_esn->seq - 1) % replay_esn->replay_window; + + if (seq > replay_esn->seq) { + diff = seq - replay_esn->seq; + + if (diff < replay_esn->replay_window) { + for (i = 1; i < diff; i++) { + bitnr = (pos + i) % replay_esn->replay_window; + nr = bitnr >> 5; + bitnr = bitnr & 0x1F; + replay_esn->bmp[nr] &= ~(1U << bitnr); + } + } else { + nr = (replay_esn->replay_window - 1) >> 5; + for (i = 0; i <= nr; i++) + replay_esn->bmp[i] = 0; + } + + bitnr = (pos + diff) % replay_esn->replay_window; + replay_esn->seq = seq; + } else { + diff = replay_esn->seq - seq; + + if (pos >= diff) + bitnr = (pos - diff) % replay_esn->replay_window; + else + bitnr = replay_esn->replay_window - (diff - pos); + } + + nr = bitnr >> 5; + bitnr = bitnr & 0x1F; + replay_esn->bmp[nr] |= (1U << bitnr); + + if (xfrm_aevent_is_on(xs_net(x))) + x->repl->notify(x, XFRM_REPLAY_UPDATE); +} + +static void xfrm_replay_notify_bmp(struct xfrm_state *x, int event) +{ + struct km_event c; + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + struct xfrm_replay_state_esn *preplay_esn = x->preplay_esn; + + /* we send notify messages in case + * 1. we updated on of the sequence numbers, and the seqno difference + * is at least x->replay_maxdiff, in this case we also update the + * timeout of our timer function + * 2. if x->replay_maxage has elapsed since last update, + * and there were changes + * + * The state structure must be locked! + */ + + switch (event) { + case XFRM_REPLAY_UPDATE: + if (!x->replay_maxdiff || + ((replay_esn->seq - preplay_esn->seq < x->replay_maxdiff) && + (replay_esn->oseq - preplay_esn->oseq + < x->replay_maxdiff))) { + if (x->xflags & XFRM_TIME_DEFER) + event = XFRM_REPLAY_TIMEOUT; + else + return; + } + + break; + + case XFRM_REPLAY_TIMEOUT: + if (memcmp(x->replay_esn, x->preplay_esn, + xfrm_replay_state_esn_len(replay_esn)) == 0) { + x->xflags |= XFRM_TIME_DEFER; + return; + } + + break; + } + + memcpy(x->preplay_esn, x->replay_esn, + xfrm_replay_state_esn_len(replay_esn)); + c.event = XFRM_MSG_NEWAE; + c.data.aevent = event; + km_state_notify(x, &c); + + if (x->replay_maxage && + !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) + x->xflags &= ~XFRM_TIME_DEFER; +} + +static void xfrm_replay_notify_esn(struct xfrm_state *x, int event) +{ + u32 seq_diff, oseq_diff; + struct km_event c; + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + struct xfrm_replay_state_esn *preplay_esn = x->preplay_esn; + + /* we send notify messages in case + * 1. we updated on of the sequence numbers, and the seqno difference + * is at least x->replay_maxdiff, in this case we also update the + * timeout of our timer function + * 2. if x->replay_maxage has elapsed since last update, + * and there were changes + * + * The state structure must be locked! + */ + + switch (event) { + case XFRM_REPLAY_UPDATE: + if (x->replay_maxdiff) { + if (replay_esn->seq_hi == preplay_esn->seq_hi) + seq_diff = replay_esn->seq - preplay_esn->seq; + else + seq_diff = ~preplay_esn->seq + replay_esn->seq + + 1; + + if (replay_esn->oseq_hi == preplay_esn->oseq_hi) + oseq_diff = replay_esn->oseq + - preplay_esn->oseq; + else + oseq_diff = ~preplay_esn->oseq + + replay_esn->oseq + 1; + + if (seq_diff >= x->replay_maxdiff || + oseq_diff >= x->replay_maxdiff) + break; + } + + if (x->xflags & XFRM_TIME_DEFER) + event = XFRM_REPLAY_TIMEOUT; + else + return; + + break; + + case XFRM_REPLAY_TIMEOUT: + if (memcmp(x->replay_esn, x->preplay_esn, + xfrm_replay_state_esn_len(replay_esn)) == 0) { + x->xflags |= XFRM_TIME_DEFER; + return; + } + + break; + } + + memcpy(x->preplay_esn, x->replay_esn, + xfrm_replay_state_esn_len(replay_esn)); + c.event = XFRM_MSG_NEWAE; + c.data.aevent = event; + km_state_notify(x, &c); + + if (x->replay_maxage && + !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) + x->xflags &= ~XFRM_TIME_DEFER; +} + +static int xfrm_replay_overflow_esn(struct xfrm_state *x, struct sk_buff *skb) +{ + int err = 0; + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + struct net *net = xs_net(x); + + if (x->type->flags & XFRM_TYPE_REPLAY_PROT) { + XFRM_SKB_CB(skb)->seq.output.low = ++replay_esn->oseq; + XFRM_SKB_CB(skb)->seq.output.hi = replay_esn->oseq_hi; + + if (unlikely(replay_esn->oseq == 0)) { + XFRM_SKB_CB(skb)->seq.output.hi = ++replay_esn->oseq_hi; + + if (replay_esn->oseq_hi == 0) { + replay_esn->oseq--; + replay_esn->oseq_hi--; + xfrm_audit_state_replay_overflow(x, skb); + err = -EOVERFLOW; + + return err; + } + } + if (xfrm_aevent_is_on(net)) + x->repl->notify(x, XFRM_REPLAY_UPDATE); + } + + return err; +} + +static int xfrm_replay_check_esn(struct xfrm_state *x, + struct sk_buff *skb, __be32 net_seq) +{ + unsigned int bitnr, nr; + u32 diff; + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + u32 pos; + u32 seq = ntohl(net_seq); + u32 wsize = replay_esn->replay_window; + u32 top = replay_esn->seq; + u32 bottom = top - wsize + 1; + + if (!wsize) + return 0; + + if (unlikely(seq == 0 && replay_esn->seq_hi == 0 && + (replay_esn->seq < replay_esn->replay_window - 1))) + goto err; + + diff = top - seq; + + if (likely(top >= wsize - 1)) { + /* A. same subspace */ + if (likely(seq > top) || seq < bottom) + return 0; + } else { + /* B. window spans two subspaces */ + if (likely(seq > top && seq < bottom)) + return 0; + if (seq >= bottom) + diff = ~seq + top + 1; + } + + if (diff >= replay_esn->replay_window) { + x->stats.replay_window++; + goto err; + } + + pos = (replay_esn->seq - 1) % replay_esn->replay_window; + + if (pos >= diff) + bitnr = (pos - diff) % replay_esn->replay_window; + else + bitnr = replay_esn->replay_window - (diff - pos); + + nr = bitnr >> 5; + bitnr = bitnr & 0x1F; + if (replay_esn->bmp[nr] & (1U << bitnr)) + goto err_replay; + + return 0; + +err_replay: + x->stats.replay++; +err: + xfrm_audit_state_replay(x, skb, net_seq); + return -EINVAL; +} + +static int xfrm_replay_recheck_esn(struct xfrm_state *x, + struct sk_buff *skb, __be32 net_seq) +{ + if (unlikely(XFRM_SKB_CB(skb)->seq.input.hi != + htonl(xfrm_replay_seqhi(x, net_seq)))) { + x->stats.replay_window++; + return -EINVAL; + } + + return xfrm_replay_check_esn(x, skb, net_seq); +} + +static void xfrm_replay_advance_esn(struct xfrm_state *x, __be32 net_seq) +{ + unsigned int bitnr, nr, i; + int wrap; + u32 diff, pos, seq, seq_hi; + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + + if (!replay_esn->replay_window) + return; + + seq = ntohl(net_seq); + pos = (replay_esn->seq - 1) % replay_esn->replay_window; + seq_hi = xfrm_replay_seqhi(x, net_seq); + wrap = seq_hi - replay_esn->seq_hi; + + if ((!wrap && seq > replay_esn->seq) || wrap > 0) { + if (likely(!wrap)) + diff = seq - replay_esn->seq; + else + diff = ~replay_esn->seq + seq + 1; + + if (diff < replay_esn->replay_window) { + for (i = 1; i < diff; i++) { + bitnr = (pos + i) % replay_esn->replay_window; + nr = bitnr >> 5; + bitnr = bitnr & 0x1F; + replay_esn->bmp[nr] &= ~(1U << bitnr); + } + } else { + nr = (replay_esn->replay_window - 1) >> 5; + for (i = 0; i <= nr; i++) + replay_esn->bmp[i] = 0; + } + + bitnr = (pos + diff) % replay_esn->replay_window; + replay_esn->seq = seq; + + if (unlikely(wrap > 0)) + replay_esn->seq_hi++; + } else { + diff = replay_esn->seq - seq; + + if (pos >= diff) + bitnr = (pos - diff) % replay_esn->replay_window; + else + bitnr = replay_esn->replay_window - (diff - pos); + } + + nr = bitnr >> 5; + bitnr = bitnr & 0x1F; + replay_esn->bmp[nr] |= (1U << bitnr); + + if (xfrm_aevent_is_on(xs_net(x))) + x->repl->notify(x, XFRM_REPLAY_UPDATE); +} + +static struct xfrm_replay xfrm_replay_legacy = { + .advance = xfrm_replay_advance, + .check = xfrm_replay_check, + .recheck = xfrm_replay_check, + .notify = xfrm_replay_notify, + .overflow = xfrm_replay_overflow, +}; + +static struct xfrm_replay xfrm_replay_bmp = { + .advance = xfrm_replay_advance_bmp, + .check = xfrm_replay_check_bmp, + .recheck = xfrm_replay_check_bmp, + .notify = xfrm_replay_notify_bmp, + .overflow = xfrm_replay_overflow_bmp, +}; + +static struct xfrm_replay xfrm_replay_esn = { + .advance = xfrm_replay_advance_esn, + .check = xfrm_replay_check_esn, + .recheck = xfrm_replay_recheck_esn, + .notify = xfrm_replay_notify_esn, + .overflow = xfrm_replay_overflow_esn, +}; + +int xfrm_init_replay(struct xfrm_state *x) +{ + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + + if (replay_esn) { + if (replay_esn->replay_window > + replay_esn->bmp_len * sizeof(__u32) * 8) + return -EINVAL; + + if (x->props.flags & XFRM_STATE_ESN) { + if (replay_esn->replay_window == 0) + return -EINVAL; + x->repl = &xfrm_replay_esn; + } else + x->repl = &xfrm_replay_bmp; + } else + x->repl = &xfrm_replay_legacy; + + return 0; +} +EXPORT_SYMBOL(xfrm_init_replay); diff --git a/kernel/net/xfrm/xfrm_state.c b/kernel/net/xfrm/xfrm_state.c new file mode 100644 index 000000000..96688cd0f --- /dev/null +++ b/kernel/net/xfrm/xfrm_state.c @@ -0,0 +1,2294 @@ +/* + * xfrm_state.c + * + * Changes: + * Mitsuru KANDA @USAGI + * Kazunori MIYAZAWA @USAGI + * Kunihiro Ishiguro + * IPv6 support + * YOSHIFUJI Hideaki @USAGI + * Split up af-specific functions + * Derek Atkins + * Add UDP Encapsulation + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "xfrm_hash.h" + +/* Each xfrm_state may be linked to two tables: + + 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) + 2. Hash table by (daddr,family,reqid) to find what SAs exist for given + destination/tunnel endpoint. (output) + */ + +static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; + +static inline unsigned int xfrm_dst_hash(struct net *net, + const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + u32 reqid, + unsigned short family) +{ + return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask); +} + +static inline unsigned int xfrm_src_hash(struct net *net, + const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + unsigned short family) +{ + return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask); +} + +static inline unsigned int +xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr, + __be32 spi, u8 proto, unsigned short family) +{ + return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask); +} + +static void xfrm_hash_transfer(struct hlist_head *list, + struct hlist_head *ndsttable, + struct hlist_head *nsrctable, + struct hlist_head *nspitable, + unsigned int nhashmask) +{ + struct hlist_node *tmp; + struct xfrm_state *x; + + hlist_for_each_entry_safe(x, tmp, list, bydst) { + unsigned int h; + + h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, + x->props.reqid, x->props.family, + nhashmask); + hlist_add_head(&x->bydst, ndsttable+h); + + h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, + x->props.family, + nhashmask); + hlist_add_head(&x->bysrc, nsrctable+h); + + if (x->id.spi) { + h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, + x->id.proto, x->props.family, + nhashmask); + hlist_add_head(&x->byspi, nspitable+h); + } + } +} + +static unsigned long xfrm_hash_new_size(unsigned int state_hmask) +{ + return ((state_hmask + 1) << 1) * sizeof(struct hlist_head); +} + +static void xfrm_hash_resize(struct work_struct *work) +{ + struct net *net = container_of(work, struct net, xfrm.state_hash_work); + struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; + unsigned long nsize, osize; + unsigned int nhashmask, ohashmask; + int i; + + nsize = xfrm_hash_new_size(net->xfrm.state_hmask); + ndst = xfrm_hash_alloc(nsize); + if (!ndst) + return; + nsrc = xfrm_hash_alloc(nsize); + if (!nsrc) { + xfrm_hash_free(ndst, nsize); + return; + } + nspi = xfrm_hash_alloc(nsize); + if (!nspi) { + xfrm_hash_free(ndst, nsize); + xfrm_hash_free(nsrc, nsize); + return; + } + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + + nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; + for (i = net->xfrm.state_hmask; i >= 0; i--) + xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi, + nhashmask); + + odst = net->xfrm.state_bydst; + osrc = net->xfrm.state_bysrc; + ospi = net->xfrm.state_byspi; + ohashmask = net->xfrm.state_hmask; + + net->xfrm.state_bydst = ndst; + net->xfrm.state_bysrc = nsrc; + net->xfrm.state_byspi = nspi; + net->xfrm.state_hmask = nhashmask; + + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + osize = (ohashmask + 1) * sizeof(struct hlist_head); + xfrm_hash_free(odst, osize); + xfrm_hash_free(osrc, osize); + xfrm_hash_free(ospi, osize); +} + +static DEFINE_SPINLOCK(xfrm_state_afinfo_lock); +static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO]; + +static DEFINE_SPINLOCK(xfrm_state_gc_lock); + +int __xfrm_state_delete(struct xfrm_state *x); + +int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); +bool km_is_alive(const struct km_event *c); +void km_state_expired(struct xfrm_state *x, int hard, u32 portid); + +static DEFINE_SPINLOCK(xfrm_type_lock); +int xfrm_register_type(const struct xfrm_type *type, unsigned short family) +{ + struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); + const struct xfrm_type **typemap; + int err = 0; + + if (unlikely(afinfo == NULL)) + return -EAFNOSUPPORT; + typemap = afinfo->type_map; + spin_lock_bh(&xfrm_type_lock); + + if (likely(typemap[type->proto] == NULL)) + typemap[type->proto] = type; + else + err = -EEXIST; + spin_unlock_bh(&xfrm_type_lock); + xfrm_state_put_afinfo(afinfo); + return err; +} +EXPORT_SYMBOL(xfrm_register_type); + +int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family) +{ + struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); + const struct xfrm_type **typemap; + int err = 0; + + if (unlikely(afinfo == NULL)) + return -EAFNOSUPPORT; + typemap = afinfo->type_map; + spin_lock_bh(&xfrm_type_lock); + + if (unlikely(typemap[type->proto] != type)) + err = -ENOENT; + else + typemap[type->proto] = NULL; + spin_unlock_bh(&xfrm_type_lock); + xfrm_state_put_afinfo(afinfo); + return err; +} +EXPORT_SYMBOL(xfrm_unregister_type); + +static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) +{ + struct xfrm_state_afinfo *afinfo; + const struct xfrm_type **typemap; + const struct xfrm_type *type; + int modload_attempted = 0; + +retry: + afinfo = xfrm_state_get_afinfo(family); + if (unlikely(afinfo == NULL)) + return NULL; + typemap = afinfo->type_map; + + type = typemap[proto]; + if (unlikely(type && !try_module_get(type->owner))) + type = NULL; + if (!type && !modload_attempted) { + xfrm_state_put_afinfo(afinfo); + request_module("xfrm-type-%d-%d", family, proto); + modload_attempted = 1; + goto retry; + } + + xfrm_state_put_afinfo(afinfo); + return type; +} + +static void xfrm_put_type(const struct xfrm_type *type) +{ + module_put(type->owner); +} + +static DEFINE_SPINLOCK(xfrm_mode_lock); +int xfrm_register_mode(struct xfrm_mode *mode, int family) +{ + struct xfrm_state_afinfo *afinfo; + struct xfrm_mode **modemap; + int err; + + if (unlikely(mode->encap >= XFRM_MODE_MAX)) + return -EINVAL; + + afinfo = xfrm_state_get_afinfo(family); + if (unlikely(afinfo == NULL)) + return -EAFNOSUPPORT; + + err = -EEXIST; + modemap = afinfo->mode_map; + spin_lock_bh(&xfrm_mode_lock); + if (modemap[mode->encap]) + goto out; + + err = -ENOENT; + if (!try_module_get(afinfo->owner)) + goto out; + + mode->afinfo = afinfo; + modemap[mode->encap] = mode; + err = 0; + +out: + spin_unlock_bh(&xfrm_mode_lock); + xfrm_state_put_afinfo(afinfo); + return err; +} +EXPORT_SYMBOL(xfrm_register_mode); + +int xfrm_unregister_mode(struct xfrm_mode *mode, int family) +{ + struct xfrm_state_afinfo *afinfo; + struct xfrm_mode **modemap; + int err; + + if (unlikely(mode->encap >= XFRM_MODE_MAX)) + return -EINVAL; + + afinfo = xfrm_state_get_afinfo(family); + if (unlikely(afinfo == NULL)) + return -EAFNOSUPPORT; + + err = -ENOENT; + modemap = afinfo->mode_map; + spin_lock_bh(&xfrm_mode_lock); + if (likely(modemap[mode->encap] == mode)) { + modemap[mode->encap] = NULL; + module_put(mode->afinfo->owner); + err = 0; + } + + spin_unlock_bh(&xfrm_mode_lock); + xfrm_state_put_afinfo(afinfo); + return err; +} +EXPORT_SYMBOL(xfrm_unregister_mode); + +static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) +{ + struct xfrm_state_afinfo *afinfo; + struct xfrm_mode *mode; + int modload_attempted = 0; + + if (unlikely(encap >= XFRM_MODE_MAX)) + return NULL; + +retry: + afinfo = xfrm_state_get_afinfo(family); + if (unlikely(afinfo == NULL)) + return NULL; + + mode = afinfo->mode_map[encap]; + if (unlikely(mode && !try_module_get(mode->owner))) + mode = NULL; + if (!mode && !modload_attempted) { + xfrm_state_put_afinfo(afinfo); + request_module("xfrm-mode-%d-%d", family, encap); + modload_attempted = 1; + goto retry; + } + + xfrm_state_put_afinfo(afinfo); + return mode; +} + +static void xfrm_put_mode(struct xfrm_mode *mode) +{ + module_put(mode->owner); +} + +static void xfrm_state_gc_destroy(struct xfrm_state *x) +{ + tasklet_hrtimer_cancel(&x->mtimer); + del_timer_sync(&x->rtimer); + kfree(x->aalg); + kfree(x->ealg); + kfree(x->calg); + kfree(x->encap); + kfree(x->coaddr); + kfree(x->replay_esn); + kfree(x->preplay_esn); + if (x->inner_mode) + xfrm_put_mode(x->inner_mode); + if (x->inner_mode_iaf) + xfrm_put_mode(x->inner_mode_iaf); + if (x->outer_mode) + xfrm_put_mode(x->outer_mode); + if (x->type) { + x->type->destructor(x); + xfrm_put_type(x->type); + } + security_xfrm_state_free(x); + kfree(x); +} + +static void xfrm_state_gc_task(struct work_struct *work) +{ + struct net *net = container_of(work, struct net, xfrm.state_gc_work); + struct xfrm_state *x; + struct hlist_node *tmp; + struct hlist_head gc_list; + + spin_lock_bh(&xfrm_state_gc_lock); + hlist_move_list(&net->xfrm.state_gc_list, &gc_list); + spin_unlock_bh(&xfrm_state_gc_lock); + + hlist_for_each_entry_safe(x, tmp, &gc_list, gclist) + xfrm_state_gc_destroy(x); +} + +static inline unsigned long make_jiffies(long secs) +{ + if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) + return MAX_SCHEDULE_TIMEOUT-1; + else + return secs*HZ; +} + +static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me) +{ + struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer); + struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer); + unsigned long now = get_seconds(); + long next = LONG_MAX; + int warn = 0; + int err = 0; + + spin_lock(&x->lock); + if (x->km.state == XFRM_STATE_DEAD) + goto out; + if (x->km.state == XFRM_STATE_EXPIRED) + goto expired; + if (x->lft.hard_add_expires_seconds) { + long tmo = x->lft.hard_add_expires_seconds + + x->curlft.add_time - now; + if (tmo <= 0) { + if (x->xflags & XFRM_SOFT_EXPIRE) { + /* enter hard expire without soft expire first?! + * setting a new date could trigger this. + * workarbound: fix x->curflt.add_time by below: + */ + x->curlft.add_time = now - x->saved_tmo - 1; + tmo = x->lft.hard_add_expires_seconds - x->saved_tmo; + } else + goto expired; + } + if (tmo < next) + next = tmo; + } + if (x->lft.hard_use_expires_seconds) { + long tmo = x->lft.hard_use_expires_seconds + + (x->curlft.use_time ? : now) - now; + if (tmo <= 0) + goto expired; + if (tmo < next) + next = tmo; + } + if (x->km.dying) + goto resched; + if (x->lft.soft_add_expires_seconds) { + long tmo = x->lft.soft_add_expires_seconds + + x->curlft.add_time - now; + if (tmo <= 0) { + warn = 1; + x->xflags &= ~XFRM_SOFT_EXPIRE; + } else if (tmo < next) { + next = tmo; + x->xflags |= XFRM_SOFT_EXPIRE; + x->saved_tmo = tmo; + } + } + if (x->lft.soft_use_expires_seconds) { + long tmo = x->lft.soft_use_expires_seconds + + (x->curlft.use_time ? : now) - now; + if (tmo <= 0) + warn = 1; + else if (tmo < next) + next = tmo; + } + + x->km.dying = warn; + if (warn) + km_state_expired(x, 0, 0); +resched: + if (next != LONG_MAX) { + tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL); + } + + goto out; + +expired: + if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) + x->km.state = XFRM_STATE_EXPIRED; + + err = __xfrm_state_delete(x); + if (!err) + km_state_expired(x, 1, 0); + + xfrm_audit_state_delete(x, err ? 0 : 1, true); + +out: + spin_unlock(&x->lock); + return HRTIMER_NORESTART; +} + +static void xfrm_replay_timer_handler(unsigned long data); + +struct xfrm_state *xfrm_state_alloc(struct net *net) +{ + struct xfrm_state *x; + + x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); + + if (x) { + write_pnet(&x->xs_net, net); + atomic_set(&x->refcnt, 1); + atomic_set(&x->tunnel_users, 0); + INIT_LIST_HEAD(&x->km.all); + INIT_HLIST_NODE(&x->bydst); + INIT_HLIST_NODE(&x->bysrc); + INIT_HLIST_NODE(&x->byspi); + tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, + CLOCK_BOOTTIME, HRTIMER_MODE_ABS); + setup_timer(&x->rtimer, xfrm_replay_timer_handler, + (unsigned long)x); + x->curlft.add_time = get_seconds(); + x->lft.soft_byte_limit = XFRM_INF; + x->lft.soft_packet_limit = XFRM_INF; + x->lft.hard_byte_limit = XFRM_INF; + x->lft.hard_packet_limit = XFRM_INF; + x->replay_maxage = 0; + x->replay_maxdiff = 0; + x->inner_mode = NULL; + x->inner_mode_iaf = NULL; + spin_lock_init(&x->lock); + } + return x; +} +EXPORT_SYMBOL(xfrm_state_alloc); + +void __xfrm_state_destroy(struct xfrm_state *x) +{ + struct net *net = xs_net(x); + + WARN_ON(x->km.state != XFRM_STATE_DEAD); + + spin_lock_bh(&xfrm_state_gc_lock); + hlist_add_head(&x->gclist, &net->xfrm.state_gc_list); + spin_unlock_bh(&xfrm_state_gc_lock); + schedule_work(&net->xfrm.state_gc_work); +} +EXPORT_SYMBOL(__xfrm_state_destroy); + +int __xfrm_state_delete(struct xfrm_state *x) +{ + struct net *net = xs_net(x); + int err = -ESRCH; + + if (x->km.state != XFRM_STATE_DEAD) { + x->km.state = XFRM_STATE_DEAD; + spin_lock(&net->xfrm.xfrm_state_lock); + list_del(&x->km.all); + hlist_del(&x->bydst); + hlist_del(&x->bysrc); + if (x->id.spi) + hlist_del(&x->byspi); + net->xfrm.state_num--; + spin_unlock(&net->xfrm.xfrm_state_lock); + + /* All xfrm_state objects are created by xfrm_state_alloc. + * The xfrm_state_alloc call gives a reference, and that + * is what we are dropping here. + */ + xfrm_state_put(x); + err = 0; + } + + return err; +} +EXPORT_SYMBOL(__xfrm_state_delete); + +int xfrm_state_delete(struct xfrm_state *x) +{ + int err; + + spin_lock_bh(&x->lock); + err = __xfrm_state_delete(x); + spin_unlock_bh(&x->lock); + + return err; +} +EXPORT_SYMBOL(xfrm_state_delete); + +#ifdef CONFIG_SECURITY_NETWORK_XFRM +static inline int +xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid) +{ + int i, err = 0; + + for (i = 0; i <= net->xfrm.state_hmask; i++) { + struct xfrm_state *x; + + hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { + if (xfrm_id_proto_match(x->id.proto, proto) && + (err = security_xfrm_state_delete(x)) != 0) { + xfrm_audit_state_delete(x, 0, task_valid); + return err; + } + } + } + + return err; +} +#else +static inline int +xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid) +{ + return 0; +} +#endif + +int xfrm_state_flush(struct net *net, u8 proto, bool task_valid) +{ + int i, err = 0, cnt = 0; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + err = xfrm_state_flush_secctx_check(net, proto, task_valid); + if (err) + goto out; + + err = -ESRCH; + for (i = 0; i <= net->xfrm.state_hmask; i++) { + struct xfrm_state *x; +restart: + hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { + if (!xfrm_state_kern(x) && + xfrm_id_proto_match(x->id.proto, proto)) { + xfrm_state_hold(x); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + err = xfrm_state_delete(x); + xfrm_audit_state_delete(x, err ? 0 : 1, + task_valid); + xfrm_state_put(x); + if (!err) + cnt++; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + goto restart; + } + } + } + if (cnt) + err = 0; + +out: + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + return err; +} +EXPORT_SYMBOL(xfrm_state_flush); + +void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si) +{ + spin_lock_bh(&net->xfrm.xfrm_state_lock); + si->sadcnt = net->xfrm.state_num; + si->sadhcnt = net->xfrm.state_hmask; + si->sadhmcnt = xfrm_state_hashmax; + spin_unlock_bh(&net->xfrm.xfrm_state_lock); +} +EXPORT_SYMBOL(xfrm_sad_getinfo); + +static int +xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl, + const struct xfrm_tmpl *tmpl, + const xfrm_address_t *daddr, const xfrm_address_t *saddr, + unsigned short family) +{ + struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); + if (!afinfo) + return -1; + afinfo->init_tempsel(&x->sel, fl); + + if (family != tmpl->encap_family) { + xfrm_state_put_afinfo(afinfo); + afinfo = xfrm_state_get_afinfo(tmpl->encap_family); + if (!afinfo) + return -1; + } + afinfo->init_temprop(x, tmpl, daddr, saddr); + xfrm_state_put_afinfo(afinfo); + return 0; +} + +static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark, + const xfrm_address_t *daddr, + __be32 spi, u8 proto, + unsigned short family) +{ + unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family); + struct xfrm_state *x; + + hlist_for_each_entry(x, net->xfrm.state_byspi+h, byspi) { + if (x->props.family != family || + x->id.spi != spi || + x->id.proto != proto || + !xfrm_addr_equal(&x->id.daddr, daddr, family)) + continue; + + if ((mark & x->mark.m) != x->mark.v) + continue; + xfrm_state_hold(x); + return x; + } + + return NULL; +} + +static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark, + const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + u8 proto, unsigned short family) +{ + unsigned int h = xfrm_src_hash(net, daddr, saddr, family); + struct xfrm_state *x; + + hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) { + if (x->props.family != family || + x->id.proto != proto || + !xfrm_addr_equal(&x->id.daddr, daddr, family) || + !xfrm_addr_equal(&x->props.saddr, saddr, family)) + continue; + + if ((mark & x->mark.m) != x->mark.v) + continue; + xfrm_state_hold(x); + return x; + } + + return NULL; +} + +static inline struct xfrm_state * +__xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) +{ + struct net *net = xs_net(x); + u32 mark = x->mark.v & x->mark.m; + + if (use_spi) + return __xfrm_state_lookup(net, mark, &x->id.daddr, + x->id.spi, x->id.proto, family); + else + return __xfrm_state_lookup_byaddr(net, mark, + &x->id.daddr, + &x->props.saddr, + x->id.proto, family); +} + +static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) +{ + if (have_hash_collision && + (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && + net->xfrm.state_num > net->xfrm.state_hmask) + schedule_work(&net->xfrm.state_hash_work); +} + +static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x, + const struct flowi *fl, unsigned short family, + struct xfrm_state **best, int *acq_in_progress, + int *error) +{ + /* Resolution logic: + * 1. There is a valid state with matching selector. Done. + * 2. Valid state with inappropriate selector. Skip. + * + * Entering area of "sysdeps". + * + * 3. If state is not valid, selector is temporary, it selects + * only session which triggered previous resolution. Key + * manager will do something to install a state with proper + * selector. + */ + if (x->km.state == XFRM_STATE_VALID) { + if ((x->sel.family && + !xfrm_selector_match(&x->sel, fl, x->sel.family)) || + !security_xfrm_state_pol_flow_match(x, pol, fl)) + return; + + if (!*best || + (*best)->km.dying > x->km.dying || + ((*best)->km.dying == x->km.dying && + (*best)->curlft.add_time < x->curlft.add_time)) + *best = x; + } else if (x->km.state == XFRM_STATE_ACQ) { + *acq_in_progress = 1; + } else if (x->km.state == XFRM_STATE_ERROR || + x->km.state == XFRM_STATE_EXPIRED) { + if (xfrm_selector_match(&x->sel, fl, x->sel.family) && + security_xfrm_state_pol_flow_match(x, pol, fl)) + *error = -ESRCH; + } +} + +struct xfrm_state * +xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr, + const struct flowi *fl, struct xfrm_tmpl *tmpl, + struct xfrm_policy *pol, int *err, + unsigned short family) +{ + static xfrm_address_t saddr_wildcard = { }; + struct net *net = xp_net(pol); + unsigned int h, h_wildcard; + struct xfrm_state *x, *x0, *to_put; + int acquire_in_progress = 0; + int error = 0; + struct xfrm_state *best = NULL; + u32 mark = pol->mark.v & pol->mark.m; + unsigned short encap_family = tmpl->encap_family; + struct km_event c; + + to_put = NULL; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family); + hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { + if (x->props.family == encap_family && + x->props.reqid == tmpl->reqid && + (mark & x->mark.m) == x->mark.v && + !(x->props.flags & XFRM_STATE_WILDRECV) && + xfrm_state_addr_check(x, daddr, saddr, encap_family) && + tmpl->mode == x->props.mode && + tmpl->id.proto == x->id.proto && + (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) + xfrm_state_look_at(pol, x, fl, encap_family, + &best, &acquire_in_progress, &error); + } + if (best || acquire_in_progress) + goto found; + + h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family); + hlist_for_each_entry(x, net->xfrm.state_bydst+h_wildcard, bydst) { + if (x->props.family == encap_family && + x->props.reqid == tmpl->reqid && + (mark & x->mark.m) == x->mark.v && + !(x->props.flags & XFRM_STATE_WILDRECV) && + xfrm_addr_equal(&x->id.daddr, daddr, encap_family) && + tmpl->mode == x->props.mode && + tmpl->id.proto == x->id.proto && + (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) + xfrm_state_look_at(pol, x, fl, encap_family, + &best, &acquire_in_progress, &error); + } + +found: + x = best; + if (!x && !error && !acquire_in_progress) { + if (tmpl->id.spi && + (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi, + tmpl->id.proto, encap_family)) != NULL) { + to_put = x0; + error = -EEXIST; + goto out; + } + + c.net = net; + /* If the KMs have no listeners (yet...), avoid allocating an SA + * for each and every packet - garbage collection might not + * handle the flood. + */ + if (!km_is_alive(&c)) { + error = -ESRCH; + goto out; + } + + x = xfrm_state_alloc(net); + if (x == NULL) { + error = -ENOMEM; + goto out; + } + /* Initialize temporary state matching only + * to current session. */ + xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family); + memcpy(&x->mark, &pol->mark, sizeof(x->mark)); + + error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid); + if (error) { + x->km.state = XFRM_STATE_DEAD; + to_put = x; + x = NULL; + goto out; + } + + if (km_query(x, tmpl, pol) == 0) { + x->km.state = XFRM_STATE_ACQ; + list_add(&x->km.all, &net->xfrm.state_all); + hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); + h = xfrm_src_hash(net, daddr, saddr, encap_family); + hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); + if (x->id.spi) { + h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family); + hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); + } + x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; + tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); + net->xfrm.state_num++; + xfrm_hash_grow_check(net, x->bydst.next != NULL); + } else { + x->km.state = XFRM_STATE_DEAD; + to_put = x; + x = NULL; + error = -ESRCH; + } + } +out: + if (x) + xfrm_state_hold(x); + else + *err = acquire_in_progress ? -EAGAIN : error; + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + if (to_put) + xfrm_state_put(to_put); + return x; +} + +struct xfrm_state * +xfrm_stateonly_find(struct net *net, u32 mark, + xfrm_address_t *daddr, xfrm_address_t *saddr, + unsigned short family, u8 mode, u8 proto, u32 reqid) +{ + unsigned int h; + struct xfrm_state *rx = NULL, *x = NULL; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + h = xfrm_dst_hash(net, daddr, saddr, reqid, family); + hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { + if (x->props.family == family && + x->props.reqid == reqid && + (mark & x->mark.m) == x->mark.v && + !(x->props.flags & XFRM_STATE_WILDRECV) && + xfrm_state_addr_check(x, daddr, saddr, family) && + mode == x->props.mode && + proto == x->id.proto && + x->km.state == XFRM_STATE_VALID) { + rx = x; + break; + } + } + + if (rx) + xfrm_state_hold(rx); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + + return rx; +} +EXPORT_SYMBOL(xfrm_stateonly_find); + +struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, + unsigned short family) +{ + struct xfrm_state *x; + struct xfrm_state_walk *w; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + list_for_each_entry(w, &net->xfrm.state_all, all) { + x = container_of(w, struct xfrm_state, km); + if (x->props.family != family || + x->id.spi != spi) + continue; + + xfrm_state_hold(x); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + return x; + } + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + return NULL; +} +EXPORT_SYMBOL(xfrm_state_lookup_byspi); + +static void __xfrm_state_insert(struct xfrm_state *x) +{ + struct net *net = xs_net(x); + unsigned int h; + + list_add(&x->km.all, &net->xfrm.state_all); + + h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, + x->props.reqid, x->props.family); + hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); + + h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); + hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); + + if (x->id.spi) { + h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, + x->props.family); + + hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); + } + + tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); + if (x->replay_maxage) + mod_timer(&x->rtimer, jiffies + x->replay_maxage); + + net->xfrm.state_num++; + + xfrm_hash_grow_check(net, x->bydst.next != NULL); +} + +/* net->xfrm.xfrm_state_lock is held */ +static void __xfrm_state_bump_genids(struct xfrm_state *xnew) +{ + struct net *net = xs_net(xnew); + unsigned short family = xnew->props.family; + u32 reqid = xnew->props.reqid; + struct xfrm_state *x; + unsigned int h; + u32 mark = xnew->mark.v & xnew->mark.m; + + h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); + hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { + if (x->props.family == family && + x->props.reqid == reqid && + (mark & x->mark.m) == x->mark.v && + xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) && + xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family)) + x->genid++; + } +} + +void xfrm_state_insert(struct xfrm_state *x) +{ + struct net *net = xs_net(x); + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + __xfrm_state_bump_genids(x); + __xfrm_state_insert(x); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); +} +EXPORT_SYMBOL(xfrm_state_insert); + +/* net->xfrm.xfrm_state_lock is held */ +static struct xfrm_state *__find_acq_core(struct net *net, + const struct xfrm_mark *m, + unsigned short family, u8 mode, + u32 reqid, u8 proto, + const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + int create) +{ + unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); + struct xfrm_state *x; + u32 mark = m->v & m->m; + + hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { + if (x->props.reqid != reqid || + x->props.mode != mode || + x->props.family != family || + x->km.state != XFRM_STATE_ACQ || + x->id.spi != 0 || + x->id.proto != proto || + (mark & x->mark.m) != x->mark.v || + !xfrm_addr_equal(&x->id.daddr, daddr, family) || + !xfrm_addr_equal(&x->props.saddr, saddr, family)) + continue; + + xfrm_state_hold(x); + return x; + } + + if (!create) + return NULL; + + x = xfrm_state_alloc(net); + if (likely(x)) { + switch (family) { + case AF_INET: + x->sel.daddr.a4 = daddr->a4; + x->sel.saddr.a4 = saddr->a4; + x->sel.prefixlen_d = 32; + x->sel.prefixlen_s = 32; + x->props.saddr.a4 = saddr->a4; + x->id.daddr.a4 = daddr->a4; + break; + + case AF_INET6: + x->sel.daddr.in6 = daddr->in6; + x->sel.saddr.in6 = saddr->in6; + x->sel.prefixlen_d = 128; + x->sel.prefixlen_s = 128; + x->props.saddr.in6 = saddr->in6; + x->id.daddr.in6 = daddr->in6; + break; + } + + x->km.state = XFRM_STATE_ACQ; + x->id.proto = proto; + x->props.family = family; + x->props.mode = mode; + x->props.reqid = reqid; + x->mark.v = m->v; + x->mark.m = m->m; + x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; + xfrm_state_hold(x); + tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); + list_add(&x->km.all, &net->xfrm.state_all); + hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); + h = xfrm_src_hash(net, daddr, saddr, family); + hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); + + net->xfrm.state_num++; + + xfrm_hash_grow_check(net, x->bydst.next != NULL); + } + + return x; +} + +static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); + +int xfrm_state_add(struct xfrm_state *x) +{ + struct net *net = xs_net(x); + struct xfrm_state *x1, *to_put; + int family; + int err; + u32 mark = x->mark.v & x->mark.m; + int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); + + family = x->props.family; + + to_put = NULL; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + + x1 = __xfrm_state_locate(x, use_spi, family); + if (x1) { + to_put = x1; + x1 = NULL; + err = -EEXIST; + goto out; + } + + if (use_spi && x->km.seq) { + x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq); + if (x1 && ((x1->id.proto != x->id.proto) || + !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) { + to_put = x1; + x1 = NULL; + } + } + + if (use_spi && !x1) + x1 = __find_acq_core(net, &x->mark, family, x->props.mode, + x->props.reqid, x->id.proto, + &x->id.daddr, &x->props.saddr, 0); + + __xfrm_state_bump_genids(x); + __xfrm_state_insert(x); + err = 0; + +out: + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + if (x1) { + xfrm_state_delete(x1); + xfrm_state_put(x1); + } + + if (to_put) + xfrm_state_put(to_put); + + return err; +} +EXPORT_SYMBOL(xfrm_state_add); + +#ifdef CONFIG_XFRM_MIGRATE +static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig) +{ + struct net *net = xs_net(orig); + struct xfrm_state *x = xfrm_state_alloc(net); + if (!x) + goto out; + + memcpy(&x->id, &orig->id, sizeof(x->id)); + memcpy(&x->sel, &orig->sel, sizeof(x->sel)); + memcpy(&x->lft, &orig->lft, sizeof(x->lft)); + x->props.mode = orig->props.mode; + x->props.replay_window = orig->props.replay_window; + x->props.reqid = orig->props.reqid; + x->props.family = orig->props.family; + x->props.saddr = orig->props.saddr; + + if (orig->aalg) { + x->aalg = xfrm_algo_auth_clone(orig->aalg); + if (!x->aalg) + goto error; + } + x->props.aalgo = orig->props.aalgo; + + if (orig->aead) { + x->aead = xfrm_algo_aead_clone(orig->aead); + if (!x->aead) + goto error; + } + if (orig->ealg) { + x->ealg = xfrm_algo_clone(orig->ealg); + if (!x->ealg) + goto error; + } + x->props.ealgo = orig->props.ealgo; + + if (orig->calg) { + x->calg = xfrm_algo_clone(orig->calg); + if (!x->calg) + goto error; + } + x->props.calgo = orig->props.calgo; + + if (orig->encap) { + x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL); + if (!x->encap) + goto error; + } + + if (orig->coaddr) { + x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), + GFP_KERNEL); + if (!x->coaddr) + goto error; + } + + if (orig->replay_esn) { + if (xfrm_replay_clone(x, orig)) + goto error; + } + + memcpy(&x->mark, &orig->mark, sizeof(x->mark)); + + if (xfrm_init_state(x) < 0) + goto error; + + x->props.flags = orig->props.flags; + x->props.extra_flags = orig->props.extra_flags; + + x->tfcpad = orig->tfcpad; + x->replay_maxdiff = orig->replay_maxdiff; + x->replay_maxage = orig->replay_maxage; + x->curlft.add_time = orig->curlft.add_time; + x->km.state = orig->km.state; + x->km.seq = orig->km.seq; + + return x; + + error: + xfrm_state_put(x); +out: + return NULL; +} + +struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net) +{ + unsigned int h; + struct xfrm_state *x = NULL; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + + if (m->reqid) { + h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr, + m->reqid, m->old_family); + hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { + if (x->props.mode != m->mode || + x->id.proto != m->proto) + continue; + if (m->reqid && x->props.reqid != m->reqid) + continue; + if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, + m->old_family) || + !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, + m->old_family)) + continue; + xfrm_state_hold(x); + break; + } + } else { + h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr, + m->old_family); + hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) { + if (x->props.mode != m->mode || + x->id.proto != m->proto) + continue; + if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, + m->old_family) || + !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, + m->old_family)) + continue; + xfrm_state_hold(x); + break; + } + } + + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + return x; +} +EXPORT_SYMBOL(xfrm_migrate_state_find); + +struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, + struct xfrm_migrate *m) +{ + struct xfrm_state *xc; + + xc = xfrm_state_clone(x); + if (!xc) + return NULL; + + memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); + memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); + + /* add state */ + if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) { + /* a care is needed when the destination address of the + state is to be updated as it is a part of triplet */ + xfrm_state_insert(xc); + } else { + if (xfrm_state_add(xc) < 0) + goto error; + } + + return xc; +error: + xfrm_state_put(xc); + return NULL; +} +EXPORT_SYMBOL(xfrm_state_migrate); +#endif + +int xfrm_state_update(struct xfrm_state *x) +{ + struct xfrm_state *x1, *to_put; + int err; + int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); + struct net *net = xs_net(x); + + to_put = NULL; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + x1 = __xfrm_state_locate(x, use_spi, x->props.family); + + err = -ESRCH; + if (!x1) + goto out; + + if (xfrm_state_kern(x1)) { + to_put = x1; + err = -EEXIST; + goto out; + } + + if (x1->km.state == XFRM_STATE_ACQ) { + __xfrm_state_insert(x); + x = NULL; + } + err = 0; + +out: + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + if (to_put) + xfrm_state_put(to_put); + + if (err) + return err; + + if (!x) { + xfrm_state_delete(x1); + xfrm_state_put(x1); + return 0; + } + + err = -EINVAL; + spin_lock_bh(&x1->lock); + if (likely(x1->km.state == XFRM_STATE_VALID)) { + if (x->encap && x1->encap) + memcpy(x1->encap, x->encap, sizeof(*x1->encap)); + if (x->coaddr && x1->coaddr) { + memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); + } + if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) + memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); + memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); + x1->km.dying = 0; + + tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); + if (x1->curlft.use_time) + xfrm_state_check_expire(x1); + + err = 0; + x->km.state = XFRM_STATE_DEAD; + __xfrm_state_put(x); + } + spin_unlock_bh(&x1->lock); + + xfrm_state_put(x1); + + return err; +} +EXPORT_SYMBOL(xfrm_state_update); + +int xfrm_state_check_expire(struct xfrm_state *x) +{ + if (!x->curlft.use_time) + x->curlft.use_time = get_seconds(); + + if (x->curlft.bytes >= x->lft.hard_byte_limit || + x->curlft.packets >= x->lft.hard_packet_limit) { + x->km.state = XFRM_STATE_EXPIRED; + tasklet_hrtimer_start(&x->mtimer, ktime_set(0, 0), HRTIMER_MODE_REL); + return -EINVAL; + } + + if (!x->km.dying && + (x->curlft.bytes >= x->lft.soft_byte_limit || + x->curlft.packets >= x->lft.soft_packet_limit)) { + x->km.dying = 1; + km_state_expired(x, 0, 0); + } + return 0; +} +EXPORT_SYMBOL(xfrm_state_check_expire); + +struct xfrm_state * +xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi, + u8 proto, unsigned short family) +{ + struct xfrm_state *x; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + return x; +} +EXPORT_SYMBOL(xfrm_state_lookup); + +struct xfrm_state * +xfrm_state_lookup_byaddr(struct net *net, u32 mark, + const xfrm_address_t *daddr, const xfrm_address_t *saddr, + u8 proto, unsigned short family) +{ + struct xfrm_state *x; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + return x; +} +EXPORT_SYMBOL(xfrm_state_lookup_byaddr); + +struct xfrm_state * +xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid, + u8 proto, const xfrm_address_t *daddr, + const xfrm_address_t *saddr, int create, unsigned short family) +{ + struct xfrm_state *x; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + return x; +} +EXPORT_SYMBOL(xfrm_find_acq); + +#ifdef CONFIG_XFRM_SUB_POLICY +int +xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, + unsigned short family, struct net *net) +{ + int err = 0; + struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); + if (!afinfo) + return -EAFNOSUPPORT; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); /*FIXME*/ + if (afinfo->tmpl_sort) + err = afinfo->tmpl_sort(dst, src, n); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + xfrm_state_put_afinfo(afinfo); + return err; +} +EXPORT_SYMBOL(xfrm_tmpl_sort); + +int +xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, + unsigned short family) +{ + int err = 0; + struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); + struct net *net = xs_net(*src); + + if (!afinfo) + return -EAFNOSUPPORT; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + if (afinfo->state_sort) + err = afinfo->state_sort(dst, src, n); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + xfrm_state_put_afinfo(afinfo); + return err; +} +EXPORT_SYMBOL(xfrm_state_sort); +#endif + +/* Silly enough, but I'm lazy to build resolution list */ + +static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) +{ + int i; + + for (i = 0; i <= net->xfrm.state_hmask; i++) { + struct xfrm_state *x; + + hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { + if (x->km.seq == seq && + (mark & x->mark.m) == x->mark.v && + x->km.state == XFRM_STATE_ACQ) { + xfrm_state_hold(x); + return x; + } + } + } + return NULL; +} + +struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) +{ + struct xfrm_state *x; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + x = __xfrm_find_acq_byseq(net, mark, seq); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + return x; +} +EXPORT_SYMBOL(xfrm_find_acq_byseq); + +u32 xfrm_get_acqseq(void) +{ + u32 res; + static atomic_t acqseq; + + do { + res = atomic_inc_return(&acqseq); + } while (!res); + + return res; +} +EXPORT_SYMBOL(xfrm_get_acqseq); + +int verify_spi_info(u8 proto, u32 min, u32 max) +{ + switch (proto) { + case IPPROTO_AH: + case IPPROTO_ESP: + break; + + case IPPROTO_COMP: + /* IPCOMP spi is 16-bits. */ + if (max >= 0x10000) + return -EINVAL; + break; + + default: + return -EINVAL; + } + + if (min > max) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL(verify_spi_info); + +int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) +{ + struct net *net = xs_net(x); + unsigned int h; + struct xfrm_state *x0; + int err = -ENOENT; + __be32 minspi = htonl(low); + __be32 maxspi = htonl(high); + u32 mark = x->mark.v & x->mark.m; + + spin_lock_bh(&x->lock); + if (x->km.state == XFRM_STATE_DEAD) + goto unlock; + + err = 0; + if (x->id.spi) + goto unlock; + + err = -ENOENT; + + if (minspi == maxspi) { + x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family); + if (x0) { + xfrm_state_put(x0); + goto unlock; + } + x->id.spi = minspi; + } else { + u32 spi = 0; + for (h = 0; h < high-low+1; h++) { + spi = low + prandom_u32()%(high-low+1); + x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); + if (x0 == NULL) { + x->id.spi = htonl(spi); + break; + } + xfrm_state_put(x0); + } + } + if (x->id.spi) { + spin_lock_bh(&net->xfrm.xfrm_state_lock); + h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); + hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + err = 0; + } + +unlock: + spin_unlock_bh(&x->lock); + + return err; +} +EXPORT_SYMBOL(xfrm_alloc_spi); + +static bool __xfrm_state_filter_match(struct xfrm_state *x, + struct xfrm_address_filter *filter) +{ + if (filter) { + if ((filter->family == AF_INET || + filter->family == AF_INET6) && + x->props.family != filter->family) + return false; + + return addr_match(&x->props.saddr, &filter->saddr, + filter->splen) && + addr_match(&x->id.daddr, &filter->daddr, + filter->dplen); + } + return true; +} + +int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, + int (*func)(struct xfrm_state *, int, void*), + void *data) +{ + struct xfrm_state *state; + struct xfrm_state_walk *x; + int err = 0; + + if (walk->seq != 0 && list_empty(&walk->all)) + return 0; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + if (list_empty(&walk->all)) + x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); + else + x = list_entry(&walk->all, struct xfrm_state_walk, all); + list_for_each_entry_from(x, &net->xfrm.state_all, all) { + if (x->state == XFRM_STATE_DEAD) + continue; + state = container_of(x, struct xfrm_state, km); + if (!xfrm_id_proto_match(state->id.proto, walk->proto)) + continue; + if (!__xfrm_state_filter_match(state, walk->filter)) + continue; + err = func(state, walk->seq, data); + if (err) { + list_move_tail(&walk->all, &x->all); + goto out; + } + walk->seq++; + } + if (walk->seq == 0) { + err = -ENOENT; + goto out; + } + list_del_init(&walk->all); +out: + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + return err; +} +EXPORT_SYMBOL(xfrm_state_walk); + +void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, + struct xfrm_address_filter *filter) +{ + INIT_LIST_HEAD(&walk->all); + walk->proto = proto; + walk->state = XFRM_STATE_DEAD; + walk->seq = 0; + walk->filter = filter; +} +EXPORT_SYMBOL(xfrm_state_walk_init); + +void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net) +{ + kfree(walk->filter); + + if (list_empty(&walk->all)) + return; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + list_del(&walk->all); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); +} +EXPORT_SYMBOL(xfrm_state_walk_done); + +static void xfrm_replay_timer_handler(unsigned long data) +{ + struct xfrm_state *x = (struct xfrm_state *)data; + + spin_lock(&x->lock); + + if (x->km.state == XFRM_STATE_VALID) { + if (xfrm_aevent_is_on(xs_net(x))) + x->repl->notify(x, XFRM_REPLAY_TIMEOUT); + else + x->xflags |= XFRM_TIME_DEFER; + } + + spin_unlock(&x->lock); +} + +static LIST_HEAD(xfrm_km_list); + +void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) +{ + struct xfrm_mgr *km; + + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) + if (km->notify_policy) + km->notify_policy(xp, dir, c); + rcu_read_unlock(); +} + +void km_state_notify(struct xfrm_state *x, const struct km_event *c) +{ + struct xfrm_mgr *km; + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) + if (km->notify) + km->notify(x, c); + rcu_read_unlock(); +} + +EXPORT_SYMBOL(km_policy_notify); +EXPORT_SYMBOL(km_state_notify); + +void km_state_expired(struct xfrm_state *x, int hard, u32 portid) +{ + struct km_event c; + + c.data.hard = hard; + c.portid = portid; + c.event = XFRM_MSG_EXPIRE; + km_state_notify(x, &c); +} + +EXPORT_SYMBOL(km_state_expired); +/* + * We send to all registered managers regardless of failure + * We are happy with one success +*/ +int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) +{ + int err = -EINVAL, acqret; + struct xfrm_mgr *km; + + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) { + acqret = km->acquire(x, t, pol); + if (!acqret) + err = acqret; + } + rcu_read_unlock(); + return err; +} +EXPORT_SYMBOL(km_query); + +int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) +{ + int err = -EINVAL; + struct xfrm_mgr *km; + + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) { + if (km->new_mapping) + err = km->new_mapping(x, ipaddr, sport); + if (!err) + break; + } + rcu_read_unlock(); + return err; +} +EXPORT_SYMBOL(km_new_mapping); + +void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid) +{ + struct km_event c; + + c.data.hard = hard; + c.portid = portid; + c.event = XFRM_MSG_POLEXPIRE; + km_policy_notify(pol, dir, &c); +} +EXPORT_SYMBOL(km_policy_expired); + +#ifdef CONFIG_XFRM_MIGRATE +int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, + const struct xfrm_migrate *m, int num_migrate, + const struct xfrm_kmaddress *k) +{ + int err = -EINVAL; + int ret; + struct xfrm_mgr *km; + + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) { + if (km->migrate) { + ret = km->migrate(sel, dir, type, m, num_migrate, k); + if (!ret) + err = ret; + } + } + rcu_read_unlock(); + return err; +} +EXPORT_SYMBOL(km_migrate); +#endif + +int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) +{ + int err = -EINVAL; + int ret; + struct xfrm_mgr *km; + + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) { + if (km->report) { + ret = km->report(net, proto, sel, addr); + if (!ret) + err = ret; + } + } + rcu_read_unlock(); + return err; +} +EXPORT_SYMBOL(km_report); + +bool km_is_alive(const struct km_event *c) +{ + struct xfrm_mgr *km; + bool is_alive = false; + + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) { + if (km->is_alive && km->is_alive(c)) { + is_alive = true; + break; + } + } + rcu_read_unlock(); + + return is_alive; +} +EXPORT_SYMBOL(km_is_alive); + +int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) +{ + int err; + u8 *data; + struct xfrm_mgr *km; + struct xfrm_policy *pol = NULL; + + if (optlen <= 0 || optlen > PAGE_SIZE) + return -EMSGSIZE; + + data = kmalloc(optlen, GFP_KERNEL); + if (!data) + return -ENOMEM; + + err = -EFAULT; + if (copy_from_user(data, optval, optlen)) + goto out; + + err = -EINVAL; + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) { + pol = km->compile_policy(sk, optname, data, + optlen, &err); + if (err >= 0) + break; + } + rcu_read_unlock(); + + if (err >= 0) { + xfrm_sk_policy_insert(sk, err, pol); + xfrm_pol_put(pol); + err = 0; + } + +out: + kfree(data); + return err; +} +EXPORT_SYMBOL(xfrm_user_policy); + +static DEFINE_SPINLOCK(xfrm_km_lock); + +int xfrm_register_km(struct xfrm_mgr *km) +{ + spin_lock_bh(&xfrm_km_lock); + list_add_tail_rcu(&km->list, &xfrm_km_list); + spin_unlock_bh(&xfrm_km_lock); + return 0; +} +EXPORT_SYMBOL(xfrm_register_km); + +int xfrm_unregister_km(struct xfrm_mgr *km) +{ + spin_lock_bh(&xfrm_km_lock); + list_del_rcu(&km->list); + spin_unlock_bh(&xfrm_km_lock); + synchronize_rcu(); + return 0; +} +EXPORT_SYMBOL(xfrm_unregister_km); + +int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) +{ + int err = 0; + if (unlikely(afinfo == NULL)) + return -EINVAL; + if (unlikely(afinfo->family >= NPROTO)) + return -EAFNOSUPPORT; + spin_lock_bh(&xfrm_state_afinfo_lock); + if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) + err = -ENOBUFS; + else + rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo); + spin_unlock_bh(&xfrm_state_afinfo_lock); + return err; +} +EXPORT_SYMBOL(xfrm_state_register_afinfo); + +int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) +{ + int err = 0; + if (unlikely(afinfo == NULL)) + return -EINVAL; + if (unlikely(afinfo->family >= NPROTO)) + return -EAFNOSUPPORT; + spin_lock_bh(&xfrm_state_afinfo_lock); + if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { + if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) + err = -EINVAL; + else + RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL); + } + spin_unlock_bh(&xfrm_state_afinfo_lock); + synchronize_rcu(); + return err; +} +EXPORT_SYMBOL(xfrm_state_unregister_afinfo); + +struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) +{ + struct xfrm_state_afinfo *afinfo; + if (unlikely(family >= NPROTO)) + return NULL; + rcu_read_lock(); + afinfo = rcu_dereference(xfrm_state_afinfo[family]); + if (unlikely(!afinfo)) + rcu_read_unlock(); + return afinfo; +} + +void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) +{ + rcu_read_unlock(); +} + +/* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ +void xfrm_state_delete_tunnel(struct xfrm_state *x) +{ + if (x->tunnel) { + struct xfrm_state *t = x->tunnel; + + if (atomic_read(&t->tunnel_users) == 2) + xfrm_state_delete(t); + atomic_dec(&t->tunnel_users); + xfrm_state_put(t); + x->tunnel = NULL; + } +} +EXPORT_SYMBOL(xfrm_state_delete_tunnel); + +int xfrm_state_mtu(struct xfrm_state *x, int mtu) +{ + int res; + + spin_lock_bh(&x->lock); + if (x->km.state == XFRM_STATE_VALID && + x->type && x->type->get_mtu) + res = x->type->get_mtu(x, mtu); + else + res = mtu - x->props.header_len; + spin_unlock_bh(&x->lock); + return res; +} + +int __xfrm_init_state(struct xfrm_state *x, bool init_replay) +{ + struct xfrm_state_afinfo *afinfo; + struct xfrm_mode *inner_mode; + int family = x->props.family; + int err; + + err = -EAFNOSUPPORT; + afinfo = xfrm_state_get_afinfo(family); + if (!afinfo) + goto error; + + err = 0; + if (afinfo->init_flags) + err = afinfo->init_flags(x); + + xfrm_state_put_afinfo(afinfo); + + if (err) + goto error; + + err = -EPROTONOSUPPORT; + + if (x->sel.family != AF_UNSPEC) { + inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); + if (inner_mode == NULL) + goto error; + + if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && + family != x->sel.family) { + xfrm_put_mode(inner_mode); + goto error; + } + + x->inner_mode = inner_mode; + } else { + struct xfrm_mode *inner_mode_iaf; + int iafamily = AF_INET; + + inner_mode = xfrm_get_mode(x->props.mode, x->props.family); + if (inner_mode == NULL) + goto error; + + if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) { + xfrm_put_mode(inner_mode); + goto error; + } + x->inner_mode = inner_mode; + + if (x->props.family == AF_INET) + iafamily = AF_INET6; + + inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); + if (inner_mode_iaf) { + if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) + x->inner_mode_iaf = inner_mode_iaf; + else + xfrm_put_mode(inner_mode_iaf); + } + } + + x->type = xfrm_get_type(x->id.proto, family); + if (x->type == NULL) + goto error; + + err = x->type->init_state(x); + if (err) + goto error; + + x->outer_mode = xfrm_get_mode(x->props.mode, family); + if (x->outer_mode == NULL) { + err = -EPROTONOSUPPORT; + goto error; + } + + if (init_replay) { + err = xfrm_init_replay(x); + if (err) + goto error; + } + + x->km.state = XFRM_STATE_VALID; + +error: + return err; +} + +EXPORT_SYMBOL(__xfrm_init_state); + +int xfrm_init_state(struct xfrm_state *x) +{ + return __xfrm_init_state(x, true); +} + +EXPORT_SYMBOL(xfrm_init_state); + +int __net_init xfrm_state_init(struct net *net) +{ + unsigned int sz; + + INIT_LIST_HEAD(&net->xfrm.state_all); + + sz = sizeof(struct hlist_head) * 8; + + net->xfrm.state_bydst = xfrm_hash_alloc(sz); + if (!net->xfrm.state_bydst) + goto out_bydst; + net->xfrm.state_bysrc = xfrm_hash_alloc(sz); + if (!net->xfrm.state_bysrc) + goto out_bysrc; + net->xfrm.state_byspi = xfrm_hash_alloc(sz); + if (!net->xfrm.state_byspi) + goto out_byspi; + net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); + + net->xfrm.state_num = 0; + INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); + INIT_HLIST_HEAD(&net->xfrm.state_gc_list); + INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task); + spin_lock_init(&net->xfrm.xfrm_state_lock); + return 0; + +out_byspi: + xfrm_hash_free(net->xfrm.state_bysrc, sz); +out_bysrc: + xfrm_hash_free(net->xfrm.state_bydst, sz); +out_bydst: + return -ENOMEM; +} + +void xfrm_state_fini(struct net *net) +{ + unsigned int sz; + + flush_work(&net->xfrm.state_hash_work); + xfrm_state_flush(net, IPSEC_PROTO_ANY, false); + flush_work(&net->xfrm.state_gc_work); + + WARN_ON(!list_empty(&net->xfrm.state_all)); + + sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); + WARN_ON(!hlist_empty(net->xfrm.state_byspi)); + xfrm_hash_free(net->xfrm.state_byspi, sz); + WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); + xfrm_hash_free(net->xfrm.state_bysrc, sz); + WARN_ON(!hlist_empty(net->xfrm.state_bydst)); + xfrm_hash_free(net->xfrm.state_bydst, sz); +} + +#ifdef CONFIG_AUDITSYSCALL +static void xfrm_audit_helper_sainfo(struct xfrm_state *x, + struct audit_buffer *audit_buf) +{ + struct xfrm_sec_ctx *ctx = x->security; + u32 spi = ntohl(x->id.spi); + + if (ctx) + audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", + ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); + + switch (x->props.family) { + case AF_INET: + audit_log_format(audit_buf, " src=%pI4 dst=%pI4", + &x->props.saddr.a4, &x->id.daddr.a4); + break; + case AF_INET6: + audit_log_format(audit_buf, " src=%pI6 dst=%pI6", + x->props.saddr.a6, x->id.daddr.a6); + break; + } + + audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); +} + +static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, + struct audit_buffer *audit_buf) +{ + const struct iphdr *iph4; + const struct ipv6hdr *iph6; + + switch (family) { + case AF_INET: + iph4 = ip_hdr(skb); + audit_log_format(audit_buf, " src=%pI4 dst=%pI4", + &iph4->saddr, &iph4->daddr); + break; + case AF_INET6: + iph6 = ipv6_hdr(skb); + audit_log_format(audit_buf, + " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", + &iph6->saddr, &iph6->daddr, + iph6->flow_lbl[0] & 0x0f, + iph6->flow_lbl[1], + iph6->flow_lbl[2]); + break; + } +} + +void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid) +{ + struct audit_buffer *audit_buf; + + audit_buf = xfrm_audit_start("SAD-add"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_usrinfo(task_valid, audit_buf); + xfrm_audit_helper_sainfo(x, audit_buf); + audit_log_format(audit_buf, " res=%u", result); + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_state_add); + +void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid) +{ + struct audit_buffer *audit_buf; + + audit_buf = xfrm_audit_start("SAD-delete"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_usrinfo(task_valid, audit_buf); + xfrm_audit_helper_sainfo(x, audit_buf); + audit_log_format(audit_buf, " res=%u", result); + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); + +void xfrm_audit_state_replay_overflow(struct xfrm_state *x, + struct sk_buff *skb) +{ + struct audit_buffer *audit_buf; + u32 spi; + + audit_buf = xfrm_audit_start("SA-replay-overflow"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); + /* don't record the sequence number because it's inherent in this kind + * of audit message */ + spi = ntohl(x->id.spi); + audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); + +void xfrm_audit_state_replay(struct xfrm_state *x, + struct sk_buff *skb, __be32 net_seq) +{ + struct audit_buffer *audit_buf; + u32 spi; + + audit_buf = xfrm_audit_start("SA-replayed-pkt"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); + spi = ntohl(x->id.spi); + audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", + spi, spi, ntohl(net_seq)); + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_state_replay); + +void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) +{ + struct audit_buffer *audit_buf; + + audit_buf = xfrm_audit_start("SA-notfound"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_pktinfo(skb, family, audit_buf); + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); + +void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, + __be32 net_spi, __be32 net_seq) +{ + struct audit_buffer *audit_buf; + u32 spi; + + audit_buf = xfrm_audit_start("SA-notfound"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_pktinfo(skb, family, audit_buf); + spi = ntohl(net_spi); + audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", + spi, spi, ntohl(net_seq)); + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); + +void xfrm_audit_state_icvfail(struct xfrm_state *x, + struct sk_buff *skb, u8 proto) +{ + struct audit_buffer *audit_buf; + __be32 net_spi; + __be32 net_seq; + + audit_buf = xfrm_audit_start("SA-icv-failure"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); + if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { + u32 spi = ntohl(net_spi); + audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", + spi, spi, ntohl(net_seq)); + } + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); +#endif /* CONFIG_AUDITSYSCALL */ diff --git a/kernel/net/xfrm/xfrm_sysctl.c b/kernel/net/xfrm/xfrm_sysctl.c new file mode 100644 index 000000000..05a6e3d9c --- /dev/null +++ b/kernel/net/xfrm/xfrm_sysctl.c @@ -0,0 +1,86 @@ +#include +#include +#include +#include + +static void __net_init __xfrm_sysctl_init(struct net *net) +{ + net->xfrm.sysctl_aevent_etime = XFRM_AE_ETIME; + net->xfrm.sysctl_aevent_rseqth = XFRM_AE_SEQT_SIZE; + net->xfrm.sysctl_larval_drop = 1; + net->xfrm.sysctl_acq_expires = 30; +} + +#ifdef CONFIG_SYSCTL +static struct ctl_table xfrm_table[] = { + { + .procname = "xfrm_aevent_etime", + .maxlen = sizeof(u32), + .mode = 0644, + .proc_handler = proc_dointvec + }, + { + .procname = "xfrm_aevent_rseqth", + .maxlen = sizeof(u32), + .mode = 0644, + .proc_handler = proc_dointvec + }, + { + .procname = "xfrm_larval_drop", + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec + }, + { + .procname = "xfrm_acq_expires", + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec + }, + {} +}; + +int __net_init xfrm_sysctl_init(struct net *net) +{ + struct ctl_table *table; + + __xfrm_sysctl_init(net); + + table = kmemdup(xfrm_table, sizeof(xfrm_table), GFP_KERNEL); + if (!table) + goto out_kmemdup; + table[0].data = &net->xfrm.sysctl_aevent_etime; + table[1].data = &net->xfrm.sysctl_aevent_rseqth; + table[2].data = &net->xfrm.sysctl_larval_drop; + table[3].data = &net->xfrm.sysctl_acq_expires; + + /* Don't export sysctls to unprivileged users */ + if (net->user_ns != &init_user_ns) + table[0].procname = NULL; + + net->xfrm.sysctl_hdr = register_net_sysctl(net, "net/core", table); + if (!net->xfrm.sysctl_hdr) + goto out_register; + return 0; + +out_register: + kfree(table); +out_kmemdup: + return -ENOMEM; +} + +void __net_exit xfrm_sysctl_fini(struct net *net) +{ + struct ctl_table *table; + + table = net->xfrm.sysctl_hdr->ctl_table_arg; + unregister_net_sysctl_table(net->xfrm.sysctl_hdr); + kfree(table); +} +#else +int __net_init xfrm_sysctl_init(struct net *net) +{ + __xfrm_sysctl_init(net); + return 0; +} +#endif diff --git a/kernel/net/xfrm/xfrm_user.c b/kernel/net/xfrm/xfrm_user.c new file mode 100644 index 000000000..209166429 --- /dev/null +++ b/kernel/net/xfrm/xfrm_user.c @@ -0,0 +1,3146 @@ +/* xfrm_user.c: User interface to configure xfrm engine. + * + * Copyright (C) 2002 David S. Miller (davem@redhat.com) + * + * Changes: + * Mitsuru KANDA @USAGI + * Kazunori MIYAZAWA @USAGI + * Kunihiro Ishiguro + * IPv6 support + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#if IS_ENABLED(CONFIG_IPV6) +#include +#endif + +static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type) +{ + struct nlattr *rt = attrs[type]; + struct xfrm_algo *algp; + + if (!rt) + return 0; + + algp = nla_data(rt); + if (nla_len(rt) < xfrm_alg_len(algp)) + return -EINVAL; + + switch (type) { + case XFRMA_ALG_AUTH: + case XFRMA_ALG_CRYPT: + case XFRMA_ALG_COMP: + break; + + default: + return -EINVAL; + } + + algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; + return 0; +} + +static int verify_auth_trunc(struct nlattr **attrs) +{ + struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC]; + struct xfrm_algo_auth *algp; + + if (!rt) + return 0; + + algp = nla_data(rt); + if (nla_len(rt) < xfrm_alg_auth_len(algp)) + return -EINVAL; + + algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; + return 0; +} + +static int verify_aead(struct nlattr **attrs) +{ + struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; + struct xfrm_algo_aead *algp; + + if (!rt) + return 0; + + algp = nla_data(rt); + if (nla_len(rt) < aead_len(algp)) + return -EINVAL; + + algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; + return 0; +} + +static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, + xfrm_address_t **addrp) +{ + struct nlattr *rt = attrs[type]; + + if (rt && addrp) + *addrp = nla_data(rt); +} + +static inline int verify_sec_ctx_len(struct nlattr **attrs) +{ + struct nlattr *rt = attrs[XFRMA_SEC_CTX]; + struct xfrm_user_sec_ctx *uctx; + + if (!rt) + return 0; + + uctx = nla_data(rt); + if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) + return -EINVAL; + + return 0; +} + +static inline int verify_replay(struct xfrm_usersa_info *p, + struct nlattr **attrs) +{ + struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL]; + struct xfrm_replay_state_esn *rs; + + if (p->flags & XFRM_STATE_ESN) { + if (!rt) + return -EINVAL; + + rs = nla_data(rt); + + if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8) + return -EINVAL; + + if (nla_len(rt) < xfrm_replay_state_esn_len(rs) && + nla_len(rt) != sizeof(*rs)) + return -EINVAL; + } + + if (!rt) + return 0; + + /* As only ESP and AH support ESN feature. */ + if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH)) + return -EINVAL; + + if (p->replay_window != 0) + return -EINVAL; + + return 0; +} + +static int verify_newsa_info(struct xfrm_usersa_info *p, + struct nlattr **attrs) +{ + int err; + + err = -EINVAL; + switch (p->family) { + case AF_INET: + break; + + case AF_INET6: +#if IS_ENABLED(CONFIG_IPV6) + break; +#else + err = -EAFNOSUPPORT; + goto out; +#endif + + default: + goto out; + } + + err = -EINVAL; + switch (p->id.proto) { + case IPPROTO_AH: + if ((!attrs[XFRMA_ALG_AUTH] && + !attrs[XFRMA_ALG_AUTH_TRUNC]) || + attrs[XFRMA_ALG_AEAD] || + attrs[XFRMA_ALG_CRYPT] || + attrs[XFRMA_ALG_COMP] || + attrs[XFRMA_TFCPAD]) + goto out; + break; + + case IPPROTO_ESP: + if (attrs[XFRMA_ALG_COMP]) + goto out; + if (!attrs[XFRMA_ALG_AUTH] && + !attrs[XFRMA_ALG_AUTH_TRUNC] && + !attrs[XFRMA_ALG_CRYPT] && + !attrs[XFRMA_ALG_AEAD]) + goto out; + if ((attrs[XFRMA_ALG_AUTH] || + attrs[XFRMA_ALG_AUTH_TRUNC] || + attrs[XFRMA_ALG_CRYPT]) && + attrs[XFRMA_ALG_AEAD]) + goto out; + if (attrs[XFRMA_TFCPAD] && + p->mode != XFRM_MODE_TUNNEL) + goto out; + break; + + case IPPROTO_COMP: + if (!attrs[XFRMA_ALG_COMP] || + attrs[XFRMA_ALG_AEAD] || + attrs[XFRMA_ALG_AUTH] || + attrs[XFRMA_ALG_AUTH_TRUNC] || + attrs[XFRMA_ALG_CRYPT] || + attrs[XFRMA_TFCPAD] || + (ntohl(p->id.spi) >= 0x10000)) + goto out; + break; + +#if IS_ENABLED(CONFIG_IPV6) + case IPPROTO_DSTOPTS: + case IPPROTO_ROUTING: + if (attrs[XFRMA_ALG_COMP] || + attrs[XFRMA_ALG_AUTH] || + attrs[XFRMA_ALG_AUTH_TRUNC] || + attrs[XFRMA_ALG_AEAD] || + attrs[XFRMA_ALG_CRYPT] || + attrs[XFRMA_ENCAP] || + attrs[XFRMA_SEC_CTX] || + attrs[XFRMA_TFCPAD] || + !attrs[XFRMA_COADDR]) + goto out; + break; +#endif + + default: + goto out; + } + + if ((err = verify_aead(attrs))) + goto out; + if ((err = verify_auth_trunc(attrs))) + goto out; + if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) + goto out; + if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) + goto out; + if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) + goto out; + if ((err = verify_sec_ctx_len(attrs))) + goto out; + if ((err = verify_replay(p, attrs))) + goto out; + + err = -EINVAL; + switch (p->mode) { + case XFRM_MODE_TRANSPORT: + case XFRM_MODE_TUNNEL: + case XFRM_MODE_ROUTEOPTIMIZATION: + case XFRM_MODE_BEET: + break; + + default: + goto out; + } + + err = 0; + +out: + return err; +} + +static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, + struct xfrm_algo_desc *(*get_byname)(const char *, int), + struct nlattr *rta) +{ + struct xfrm_algo *p, *ualg; + struct xfrm_algo_desc *algo; + + if (!rta) + return 0; + + ualg = nla_data(rta); + + algo = get_byname(ualg->alg_name, 1); + if (!algo) + return -ENOSYS; + *props = algo->desc.sadb_alg_id; + + p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); + if (!p) + return -ENOMEM; + + strcpy(p->alg_name, algo->name); + *algpp = p; + return 0; +} + +static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, + struct nlattr *rta) +{ + struct xfrm_algo *ualg; + struct xfrm_algo_auth *p; + struct xfrm_algo_desc *algo; + + if (!rta) + return 0; + + ualg = nla_data(rta); + + algo = xfrm_aalg_get_byname(ualg->alg_name, 1); + if (!algo) + return -ENOSYS; + *props = algo->desc.sadb_alg_id; + + p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); + if (!p) + return -ENOMEM; + + strcpy(p->alg_name, algo->name); + p->alg_key_len = ualg->alg_key_len; + p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; + memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); + + *algpp = p; + return 0; +} + +static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, + struct nlattr *rta) +{ + struct xfrm_algo_auth *p, *ualg; + struct xfrm_algo_desc *algo; + + if (!rta) + return 0; + + ualg = nla_data(rta); + + algo = xfrm_aalg_get_byname(ualg->alg_name, 1); + if (!algo) + return -ENOSYS; + if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) + return -EINVAL; + *props = algo->desc.sadb_alg_id; + + p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); + if (!p) + return -ENOMEM; + + strcpy(p->alg_name, algo->name); + if (!p->alg_trunc_len) + p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; + + *algpp = p; + return 0; +} + +static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props, + struct nlattr *rta) +{ + struct xfrm_algo_aead *p, *ualg; + struct xfrm_algo_desc *algo; + + if (!rta) + return 0; + + ualg = nla_data(rta); + + algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); + if (!algo) + return -ENOSYS; + *props = algo->desc.sadb_alg_id; + + p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); + if (!p) + return -ENOMEM; + + strcpy(p->alg_name, algo->name); + *algpp = p; + return 0; +} + +static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn, + struct nlattr *rp) +{ + struct xfrm_replay_state_esn *up; + int ulen; + + if (!replay_esn || !rp) + return 0; + + up = nla_data(rp); + ulen = xfrm_replay_state_esn_len(up); + + if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen) + return -EINVAL; + + return 0; +} + +static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn, + struct xfrm_replay_state_esn **preplay_esn, + struct nlattr *rta) +{ + struct xfrm_replay_state_esn *p, *pp, *up; + int klen, ulen; + + if (!rta) + return 0; + + up = nla_data(rta); + klen = xfrm_replay_state_esn_len(up); + ulen = nla_len(rta) >= klen ? klen : sizeof(*up); + + p = kzalloc(klen, GFP_KERNEL); + if (!p) + return -ENOMEM; + + pp = kzalloc(klen, GFP_KERNEL); + if (!pp) { + kfree(p); + return -ENOMEM; + } + + memcpy(p, up, ulen); + memcpy(pp, up, ulen); + + *replay_esn = p; + *preplay_esn = pp; + + return 0; +} + +static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) +{ + int len = 0; + + if (xfrm_ctx) { + len += sizeof(struct xfrm_user_sec_ctx); + len += xfrm_ctx->ctx_len; + } + return len; +} + +static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) +{ + memcpy(&x->id, &p->id, sizeof(x->id)); + memcpy(&x->sel, &p->sel, sizeof(x->sel)); + memcpy(&x->lft, &p->lft, sizeof(x->lft)); + x->props.mode = p->mode; + x->props.replay_window = min_t(unsigned int, p->replay_window, + sizeof(x->replay.bitmap) * 8); + x->props.reqid = p->reqid; + x->props.family = p->family; + memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); + x->props.flags = p->flags; + + if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) + x->sel.family = p->family; +} + +/* + * someday when pfkey also has support, we could have the code + * somehow made shareable and move it to xfrm_state.c - JHS + * +*/ +static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs, + int update_esn) +{ + struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; + struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL; + struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; + struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; + struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; + + if (re) { + struct xfrm_replay_state_esn *replay_esn; + replay_esn = nla_data(re); + memcpy(x->replay_esn, replay_esn, + xfrm_replay_state_esn_len(replay_esn)); + memcpy(x->preplay_esn, replay_esn, + xfrm_replay_state_esn_len(replay_esn)); + } + + if (rp) { + struct xfrm_replay_state *replay; + replay = nla_data(rp); + memcpy(&x->replay, replay, sizeof(*replay)); + memcpy(&x->preplay, replay, sizeof(*replay)); + } + + if (lt) { + struct xfrm_lifetime_cur *ltime; + ltime = nla_data(lt); + x->curlft.bytes = ltime->bytes; + x->curlft.packets = ltime->packets; + x->curlft.add_time = ltime->add_time; + x->curlft.use_time = ltime->use_time; + } + + if (et) + x->replay_maxage = nla_get_u32(et); + + if (rt) + x->replay_maxdiff = nla_get_u32(rt); +} + +static struct xfrm_state *xfrm_state_construct(struct net *net, + struct xfrm_usersa_info *p, + struct nlattr **attrs, + int *errp) +{ + struct xfrm_state *x = xfrm_state_alloc(net); + int err = -ENOMEM; + + if (!x) + goto error_no_put; + + copy_from_user_state(x, p); + + if (attrs[XFRMA_SA_EXTRA_FLAGS]) + x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]); + + if ((err = attach_aead(&x->aead, &x->props.ealgo, + attrs[XFRMA_ALG_AEAD]))) + goto error; + if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, + attrs[XFRMA_ALG_AUTH_TRUNC]))) + goto error; + if (!x->props.aalgo) { + if ((err = attach_auth(&x->aalg, &x->props.aalgo, + attrs[XFRMA_ALG_AUTH]))) + goto error; + } + if ((err = attach_one_algo(&x->ealg, &x->props.ealgo, + xfrm_ealg_get_byname, + attrs[XFRMA_ALG_CRYPT]))) + goto error; + if ((err = attach_one_algo(&x->calg, &x->props.calgo, + xfrm_calg_get_byname, + attrs[XFRMA_ALG_COMP]))) + goto error; + + if (attrs[XFRMA_ENCAP]) { + x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), + sizeof(*x->encap), GFP_KERNEL); + if (x->encap == NULL) + goto error; + } + + if (attrs[XFRMA_TFCPAD]) + x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]); + + if (attrs[XFRMA_COADDR]) { + x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), + sizeof(*x->coaddr), GFP_KERNEL); + if (x->coaddr == NULL) + goto error; + } + + xfrm_mark_get(attrs, &x->mark); + + err = __xfrm_init_state(x, false); + if (err) + goto error; + + if (attrs[XFRMA_SEC_CTX] && + security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX]))) + goto error; + + if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn, + attrs[XFRMA_REPLAY_ESN_VAL]))) + goto error; + + x->km.seq = p->seq; + x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; + /* sysctl_xfrm_aevent_etime is in 100ms units */ + x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; + + if ((err = xfrm_init_replay(x))) + goto error; + + /* override default values from above */ + xfrm_update_ae_params(x, attrs, 0); + + return x; + +error: + x->km.state = XFRM_STATE_DEAD; + xfrm_state_put(x); +error_no_put: + *errp = err; + return NULL; +} + +static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_usersa_info *p = nlmsg_data(nlh); + struct xfrm_state *x; + int err; + struct km_event c; + + err = verify_newsa_info(p, attrs); + if (err) + return err; + + x = xfrm_state_construct(net, p, attrs, &err); + if (!x) + return err; + + xfrm_state_hold(x); + if (nlh->nlmsg_type == XFRM_MSG_NEWSA) + err = xfrm_state_add(x); + else + err = xfrm_state_update(x); + + xfrm_audit_state_add(x, err ? 0 : 1, true); + + if (err < 0) { + x->km.state = XFRM_STATE_DEAD; + __xfrm_state_put(x); + goto out; + } + + c.seq = nlh->nlmsg_seq; + c.portid = nlh->nlmsg_pid; + c.event = nlh->nlmsg_type; + + km_state_notify(x, &c); +out: + xfrm_state_put(x); + return err; +} + +static struct xfrm_state *xfrm_user_state_lookup(struct net *net, + struct xfrm_usersa_id *p, + struct nlattr **attrs, + int *errp) +{ + struct xfrm_state *x = NULL; + struct xfrm_mark m; + int err; + u32 mark = xfrm_mark_get(attrs, &m); + + if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { + err = -ESRCH; + x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); + } else { + xfrm_address_t *saddr = NULL; + + verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); + if (!saddr) { + err = -EINVAL; + goto out; + } + + err = -ESRCH; + x = xfrm_state_lookup_byaddr(net, mark, + &p->daddr, saddr, + p->proto, p->family); + } + + out: + if (!x && errp) + *errp = err; + return x; +} + +static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_state *x; + int err = -ESRCH; + struct km_event c; + struct xfrm_usersa_id *p = nlmsg_data(nlh); + + x = xfrm_user_state_lookup(net, p, attrs, &err); + if (x == NULL) + return err; + + if ((err = security_xfrm_state_delete(x)) != 0) + goto out; + + if (xfrm_state_kern(x)) { + err = -EPERM; + goto out; + } + + err = xfrm_state_delete(x); + + if (err < 0) + goto out; + + c.seq = nlh->nlmsg_seq; + c.portid = nlh->nlmsg_pid; + c.event = nlh->nlmsg_type; + km_state_notify(x, &c); + +out: + xfrm_audit_state_delete(x, err ? 0 : 1, true); + xfrm_state_put(x); + return err; +} + +static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) +{ + memset(p, 0, sizeof(*p)); + memcpy(&p->id, &x->id, sizeof(p->id)); + memcpy(&p->sel, &x->sel, sizeof(p->sel)); + memcpy(&p->lft, &x->lft, sizeof(p->lft)); + memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); + memcpy(&p->stats, &x->stats, sizeof(p->stats)); + memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); + p->mode = x->props.mode; + p->replay_window = x->props.replay_window; + p->reqid = x->props.reqid; + p->family = x->props.family; + p->flags = x->props.flags; + p->seq = x->km.seq; +} + +struct xfrm_dump_info { + struct sk_buff *in_skb; + struct sk_buff *out_skb; + u32 nlmsg_seq; + u16 nlmsg_flags; +}; + +static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) +{ + struct xfrm_user_sec_ctx *uctx; + struct nlattr *attr; + int ctx_size = sizeof(*uctx) + s->ctx_len; + + attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); + if (attr == NULL) + return -EMSGSIZE; + + uctx = nla_data(attr); + uctx->exttype = XFRMA_SEC_CTX; + uctx->len = ctx_size; + uctx->ctx_doi = s->ctx_doi; + uctx->ctx_alg = s->ctx_alg; + uctx->ctx_len = s->ctx_len; + memcpy(uctx + 1, s->ctx_str, s->ctx_len); + + return 0; +} + +static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) +{ + struct xfrm_algo *algo; + struct nlattr *nla; + + nla = nla_reserve(skb, XFRMA_ALG_AUTH, + sizeof(*algo) + (auth->alg_key_len + 7) / 8); + if (!nla) + return -EMSGSIZE; + + algo = nla_data(nla); + strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name)); + memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8); + algo->alg_key_len = auth->alg_key_len; + + return 0; +} + +/* Don't change this without updating xfrm_sa_len! */ +static int copy_to_user_state_extra(struct xfrm_state *x, + struct xfrm_usersa_info *p, + struct sk_buff *skb) +{ + int ret = 0; + + copy_to_user_state(x, p); + + if (x->props.extra_flags) { + ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS, + x->props.extra_flags); + if (ret) + goto out; + } + + if (x->coaddr) { + ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); + if (ret) + goto out; + } + if (x->lastused) { + ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused); + if (ret) + goto out; + } + if (x->aead) { + ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead); + if (ret) + goto out; + } + if (x->aalg) { + ret = copy_to_user_auth(x->aalg, skb); + if (!ret) + ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC, + xfrm_alg_auth_len(x->aalg), x->aalg); + if (ret) + goto out; + } + if (x->ealg) { + ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg); + if (ret) + goto out; + } + if (x->calg) { + ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); + if (ret) + goto out; + } + if (x->encap) { + ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); + if (ret) + goto out; + } + if (x->tfcpad) { + ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad); + if (ret) + goto out; + } + ret = xfrm_mark_put(skb, &x->mark); + if (ret) + goto out; + if (x->replay_esn) + ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL, + xfrm_replay_state_esn_len(x->replay_esn), + x->replay_esn); + else + ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), + &x->replay); + if (ret) + goto out; + if (x->security) + ret = copy_sec_ctx(x->security, skb); +out: + return ret; +} + +static int dump_one_state(struct xfrm_state *x, int count, void *ptr) +{ + struct xfrm_dump_info *sp = ptr; + struct sk_buff *in_skb = sp->in_skb; + struct sk_buff *skb = sp->out_skb; + struct xfrm_usersa_info *p; + struct nlmsghdr *nlh; + int err; + + nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, + XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); + if (nlh == NULL) + return -EMSGSIZE; + + p = nlmsg_data(nlh); + + err = copy_to_user_state_extra(x, p, skb); + if (err) { + nlmsg_cancel(skb, nlh); + return err; + } + nlmsg_end(skb, nlh); + return 0; +} + +static int xfrm_dump_sa_done(struct netlink_callback *cb) +{ + struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; + struct sock *sk = cb->skb->sk; + struct net *net = sock_net(sk); + + xfrm_state_walk_done(walk, net); + return 0; +} + +static const struct nla_policy xfrma_policy[XFRMA_MAX+1]; +static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; + struct xfrm_dump_info info; + + BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > + sizeof(cb->args) - sizeof(cb->args[0])); + + info.in_skb = cb->skb; + info.out_skb = skb; + info.nlmsg_seq = cb->nlh->nlmsg_seq; + info.nlmsg_flags = NLM_F_MULTI; + + if (!cb->args[0]) { + struct nlattr *attrs[XFRMA_MAX+1]; + struct xfrm_address_filter *filter = NULL; + u8 proto = 0; + int err; + + cb->args[0] = 1; + + err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX, + xfrma_policy); + if (err < 0) + return err; + + if (attrs[XFRMA_ADDRESS_FILTER]) { + filter = kmalloc(sizeof(*filter), GFP_KERNEL); + if (filter == NULL) + return -ENOMEM; + + memcpy(filter, nla_data(attrs[XFRMA_ADDRESS_FILTER]), + sizeof(*filter)); + } + + if (attrs[XFRMA_PROTO]) + proto = nla_get_u8(attrs[XFRMA_PROTO]); + + xfrm_state_walk_init(walk, proto, filter); + } + + (void) xfrm_state_walk(net, walk, dump_one_state, &info); + + return skb->len; +} + +static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, + struct xfrm_state *x, u32 seq) +{ + struct xfrm_dump_info info; + struct sk_buff *skb; + int err; + + skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); + if (!skb) + return ERR_PTR(-ENOMEM); + + info.in_skb = in_skb; + info.out_skb = skb; + info.nlmsg_seq = seq; + info.nlmsg_flags = 0; + + err = dump_one_state(x, 0, &info); + if (err) { + kfree_skb(skb); + return ERR_PTR(err); + } + + return skb; +} + +/* A wrapper for nlmsg_multicast() checking that nlsk is still available. + * Must be called with RCU read lock. + */ +static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb, + u32 pid, unsigned int group) +{ + struct sock *nlsk = rcu_dereference(net->xfrm.nlsk); + + if (nlsk) + return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC); + else + return -1; +} + +static inline size_t xfrm_spdinfo_msgsize(void) +{ + return NLMSG_ALIGN(4) + + nla_total_size(sizeof(struct xfrmu_spdinfo)) + + nla_total_size(sizeof(struct xfrmu_spdhinfo)) + + nla_total_size(sizeof(struct xfrmu_spdhthresh)) + + nla_total_size(sizeof(struct xfrmu_spdhthresh)); +} + +static int build_spdinfo(struct sk_buff *skb, struct net *net, + u32 portid, u32 seq, u32 flags) +{ + struct xfrmk_spdinfo si; + struct xfrmu_spdinfo spc; + struct xfrmu_spdhinfo sph; + struct xfrmu_spdhthresh spt4, spt6; + struct nlmsghdr *nlh; + int err; + u32 *f; + unsigned lseq; + + nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); + if (nlh == NULL) /* shouldn't really happen ... */ + return -EMSGSIZE; + + f = nlmsg_data(nlh); + *f = flags; + xfrm_spd_getinfo(net, &si); + spc.incnt = si.incnt; + spc.outcnt = si.outcnt; + spc.fwdcnt = si.fwdcnt; + spc.inscnt = si.inscnt; + spc.outscnt = si.outscnt; + spc.fwdscnt = si.fwdscnt; + sph.spdhcnt = si.spdhcnt; + sph.spdhmcnt = si.spdhmcnt; + + do { + lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock); + + spt4.lbits = net->xfrm.policy_hthresh.lbits4; + spt4.rbits = net->xfrm.policy_hthresh.rbits4; + spt6.lbits = net->xfrm.policy_hthresh.lbits6; + spt6.rbits = net->xfrm.policy_hthresh.rbits6; + } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq)); + + err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); + if (!err) + err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); + if (!err) + err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4); + if (!err) + err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6); + if (err) { + nlmsg_cancel(skb, nlh); + return err; + } + + nlmsg_end(skb, nlh); + return 0; +} + +static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs) +{ + struct net *net = sock_net(skb->sk); + struct xfrmu_spdhthresh *thresh4 = NULL; + struct xfrmu_spdhthresh *thresh6 = NULL; + + /* selector prefixlen thresholds to hash policies */ + if (attrs[XFRMA_SPD_IPV4_HTHRESH]) { + struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH]; + + if (nla_len(rta) < sizeof(*thresh4)) + return -EINVAL; + thresh4 = nla_data(rta); + if (thresh4->lbits > 32 || thresh4->rbits > 32) + return -EINVAL; + } + if (attrs[XFRMA_SPD_IPV6_HTHRESH]) { + struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH]; + + if (nla_len(rta) < sizeof(*thresh6)) + return -EINVAL; + thresh6 = nla_data(rta); + if (thresh6->lbits > 128 || thresh6->rbits > 128) + return -EINVAL; + } + + if (thresh4 || thresh6) { + write_seqlock(&net->xfrm.policy_hthresh.lock); + if (thresh4) { + net->xfrm.policy_hthresh.lbits4 = thresh4->lbits; + net->xfrm.policy_hthresh.rbits4 = thresh4->rbits; + } + if (thresh6) { + net->xfrm.policy_hthresh.lbits6 = thresh6->lbits; + net->xfrm.policy_hthresh.rbits6 = thresh6->rbits; + } + write_sequnlock(&net->xfrm.policy_hthresh.lock); + + xfrm_policy_hash_rebuild(net); + } + + return 0; +} + +static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs) +{ + struct net *net = sock_net(skb->sk); + struct sk_buff *r_skb; + u32 *flags = nlmsg_data(nlh); + u32 sportid = NETLINK_CB(skb).portid; + u32 seq = nlh->nlmsg_seq; + + r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); + if (r_skb == NULL) + return -ENOMEM; + + if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0) + BUG(); + + return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); +} + +static inline size_t xfrm_sadinfo_msgsize(void) +{ + return NLMSG_ALIGN(4) + + nla_total_size(sizeof(struct xfrmu_sadhinfo)) + + nla_total_size(4); /* XFRMA_SAD_CNT */ +} + +static int build_sadinfo(struct sk_buff *skb, struct net *net, + u32 portid, u32 seq, u32 flags) +{ + struct xfrmk_sadinfo si; + struct xfrmu_sadhinfo sh; + struct nlmsghdr *nlh; + int err; + u32 *f; + + nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); + if (nlh == NULL) /* shouldn't really happen ... */ + return -EMSGSIZE; + + f = nlmsg_data(nlh); + *f = flags; + xfrm_sad_getinfo(net, &si); + + sh.sadhmcnt = si.sadhmcnt; + sh.sadhcnt = si.sadhcnt; + + err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt); + if (!err) + err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); + if (err) { + nlmsg_cancel(skb, nlh); + return err; + } + + nlmsg_end(skb, nlh); + return 0; +} + +static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs) +{ + struct net *net = sock_net(skb->sk); + struct sk_buff *r_skb; + u32 *flags = nlmsg_data(nlh); + u32 sportid = NETLINK_CB(skb).portid; + u32 seq = nlh->nlmsg_seq; + + r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); + if (r_skb == NULL) + return -ENOMEM; + + if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0) + BUG(); + + return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); +} + +static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_usersa_id *p = nlmsg_data(nlh); + struct xfrm_state *x; + struct sk_buff *resp_skb; + int err = -ESRCH; + + x = xfrm_user_state_lookup(net, p, attrs, &err); + if (x == NULL) + goto out_noput; + + resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); + if (IS_ERR(resp_skb)) { + err = PTR_ERR(resp_skb); + } else { + err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); + } + xfrm_state_put(x); +out_noput: + return err; +} + +static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_state *x; + struct xfrm_userspi_info *p; + struct sk_buff *resp_skb; + xfrm_address_t *daddr; + int family; + int err; + u32 mark; + struct xfrm_mark m; + + p = nlmsg_data(nlh); + err = verify_spi_info(p->info.id.proto, p->min, p->max); + if (err) + goto out_noput; + + family = p->info.family; + daddr = &p->info.id.daddr; + + x = NULL; + + mark = xfrm_mark_get(attrs, &m); + if (p->info.seq) { + x = xfrm_find_acq_byseq(net, mark, p->info.seq); + if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) { + xfrm_state_put(x); + x = NULL; + } + } + + if (!x) + x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, + p->info.id.proto, daddr, + &p->info.saddr, 1, + family); + err = -ENOENT; + if (x == NULL) + goto out_noput; + + err = xfrm_alloc_spi(x, p->min, p->max); + if (err) + goto out; + + resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); + if (IS_ERR(resp_skb)) { + err = PTR_ERR(resp_skb); + goto out; + } + + err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); + +out: + xfrm_state_put(x); +out_noput: + return err; +} + +static int verify_policy_dir(u8 dir) +{ + switch (dir) { + case XFRM_POLICY_IN: + case XFRM_POLICY_OUT: + case XFRM_POLICY_FWD: + break; + + default: + return -EINVAL; + } + + return 0; +} + +static int verify_policy_type(u8 type) +{ + switch (type) { + case XFRM_POLICY_TYPE_MAIN: +#ifdef CONFIG_XFRM_SUB_POLICY + case XFRM_POLICY_TYPE_SUB: +#endif + break; + + default: + return -EINVAL; + } + + return 0; +} + +static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) +{ + int ret; + + switch (p->share) { + case XFRM_SHARE_ANY: + case XFRM_SHARE_SESSION: + case XFRM_SHARE_USER: + case XFRM_SHARE_UNIQUE: + break; + + default: + return -EINVAL; + } + + switch (p->action) { + case XFRM_POLICY_ALLOW: + case XFRM_POLICY_BLOCK: + break; + + default: + return -EINVAL; + } + + switch (p->sel.family) { + case AF_INET: + break; + + case AF_INET6: +#if IS_ENABLED(CONFIG_IPV6) + break; +#else + return -EAFNOSUPPORT; +#endif + + default: + return -EINVAL; + } + + ret = verify_policy_dir(p->dir); + if (ret) + return ret; + if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir)) + return -EINVAL; + + return 0; +} + +static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) +{ + struct nlattr *rt = attrs[XFRMA_SEC_CTX]; + struct xfrm_user_sec_ctx *uctx; + + if (!rt) + return 0; + + uctx = nla_data(rt); + return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL); +} + +static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, + int nr) +{ + int i; + + xp->xfrm_nr = nr; + for (i = 0; i < nr; i++, ut++) { + struct xfrm_tmpl *t = &xp->xfrm_vec[i]; + + memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); + memcpy(&t->saddr, &ut->saddr, + sizeof(xfrm_address_t)); + t->reqid = ut->reqid; + t->mode = ut->mode; + t->share = ut->share; + t->optional = ut->optional; + t->aalgos = ut->aalgos; + t->ealgos = ut->ealgos; + t->calgos = ut->calgos; + /* If all masks are ~0, then we allow all algorithms. */ + t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); + t->encap_family = ut->family; + } +} + +static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) +{ + int i; + + if (nr > XFRM_MAX_DEPTH) + return -EINVAL; + + for (i = 0; i < nr; i++) { + /* We never validated the ut->family value, so many + * applications simply leave it at zero. The check was + * never made and ut->family was ignored because all + * templates could be assumed to have the same family as + * the policy itself. Now that we will have ipv4-in-ipv6 + * and ipv6-in-ipv4 tunnels, this is no longer true. + */ + if (!ut[i].family) + ut[i].family = family; + + switch (ut[i].family) { + case AF_INET: + break; +#if IS_ENABLED(CONFIG_IPV6) + case AF_INET6: + break; +#endif + default: + return -EINVAL; + } + } + + return 0; +} + +static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) +{ + struct nlattr *rt = attrs[XFRMA_TMPL]; + + if (!rt) { + pol->xfrm_nr = 0; + } else { + struct xfrm_user_tmpl *utmpl = nla_data(rt); + int nr = nla_len(rt) / sizeof(*utmpl); + int err; + + err = validate_tmpl(nr, utmpl, pol->family); + if (err) + return err; + + copy_templates(pol, utmpl, nr); + } + return 0; +} + +static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) +{ + struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; + struct xfrm_userpolicy_type *upt; + u8 type = XFRM_POLICY_TYPE_MAIN; + int err; + + if (rt) { + upt = nla_data(rt); + type = upt->type; + } + + err = verify_policy_type(type); + if (err) + return err; + + *tp = type; + return 0; +} + +static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) +{ + xp->priority = p->priority; + xp->index = p->index; + memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); + memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); + xp->action = p->action; + xp->flags = p->flags; + xp->family = p->sel.family; + /* XXX xp->share = p->share; */ +} + +static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) +{ + memset(p, 0, sizeof(*p)); + memcpy(&p->sel, &xp->selector, sizeof(p->sel)); + memcpy(&p->lft, &xp->lft, sizeof(p->lft)); + memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); + p->priority = xp->priority; + p->index = xp->index; + p->sel.family = xp->family; + p->dir = dir; + p->action = xp->action; + p->flags = xp->flags; + p->share = XFRM_SHARE_ANY; /* XXX xp->share */ +} + +static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) +{ + struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); + int err; + + if (!xp) { + *errp = -ENOMEM; + return NULL; + } + + copy_from_user_policy(xp, p); + + err = copy_from_user_policy_type(&xp->type, attrs); + if (err) + goto error; + + if (!(err = copy_from_user_tmpl(xp, attrs))) + err = copy_from_user_sec_ctx(xp, attrs); + if (err) + goto error; + + xfrm_mark_get(attrs, &xp->mark); + + return xp; + error: + *errp = err; + xp->walk.dead = 1; + xfrm_policy_destroy(xp); + return NULL; +} + +static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_userpolicy_info *p = nlmsg_data(nlh); + struct xfrm_policy *xp; + struct km_event c; + int err; + int excl; + + err = verify_newpolicy_info(p); + if (err) + return err; + err = verify_sec_ctx_len(attrs); + if (err) + return err; + + xp = xfrm_policy_construct(net, p, attrs, &err); + if (!xp) + return err; + + /* shouldn't excl be based on nlh flags?? + * Aha! this is anti-netlink really i.e more pfkey derived + * in netlink excl is a flag and you wouldnt need + * a type XFRM_MSG_UPDPOLICY - JHS */ + excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; + err = xfrm_policy_insert(p->dir, xp, excl); + xfrm_audit_policy_add(xp, err ? 0 : 1, true); + + if (err) { + security_xfrm_policy_free(xp->security); + kfree(xp); + return err; + } + + c.event = nlh->nlmsg_type; + c.seq = nlh->nlmsg_seq; + c.portid = nlh->nlmsg_pid; + km_policy_notify(xp, p->dir, &c); + + xfrm_pol_put(xp); + + return 0; +} + +static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) +{ + struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; + int i; + + if (xp->xfrm_nr == 0) + return 0; + + for (i = 0; i < xp->xfrm_nr; i++) { + struct xfrm_user_tmpl *up = &vec[i]; + struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; + + memset(up, 0, sizeof(*up)); + memcpy(&up->id, &kp->id, sizeof(up->id)); + up->family = kp->encap_family; + memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); + up->reqid = kp->reqid; + up->mode = kp->mode; + up->share = kp->share; + up->optional = kp->optional; + up->aalgos = kp->aalgos; + up->ealgos = kp->ealgos; + up->calgos = kp->calgos; + } + + return nla_put(skb, XFRMA_TMPL, + sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); +} + +static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) +{ + if (x->security) { + return copy_sec_ctx(x->security, skb); + } + return 0; +} + +static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) +{ + if (xp->security) + return copy_sec_ctx(xp->security, skb); + return 0; +} +static inline size_t userpolicy_type_attrsize(void) +{ +#ifdef CONFIG_XFRM_SUB_POLICY + return nla_total_size(sizeof(struct xfrm_userpolicy_type)); +#else + return 0; +#endif +} + +#ifdef CONFIG_XFRM_SUB_POLICY +static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) +{ + struct xfrm_userpolicy_type upt = { + .type = type, + }; + + return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); +} + +#else +static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) +{ + return 0; +} +#endif + +static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) +{ + struct xfrm_dump_info *sp = ptr; + struct xfrm_userpolicy_info *p; + struct sk_buff *in_skb = sp->in_skb; + struct sk_buff *skb = sp->out_skb; + struct nlmsghdr *nlh; + int err; + + nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, + XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); + if (nlh == NULL) + return -EMSGSIZE; + + p = nlmsg_data(nlh); + copy_to_user_policy(xp, p, dir); + err = copy_to_user_tmpl(xp, skb); + if (!err) + err = copy_to_user_sec_ctx(xp, skb); + if (!err) + err = copy_to_user_policy_type(xp->type, skb); + if (!err) + err = xfrm_mark_put(skb, &xp->mark); + if (err) { + nlmsg_cancel(skb, nlh); + return err; + } + nlmsg_end(skb, nlh); + return 0; +} + +static int xfrm_dump_policy_done(struct netlink_callback *cb) +{ + struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; + struct net *net = sock_net(cb->skb->sk); + + xfrm_policy_walk_done(walk, net); + return 0; +} + +static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; + struct xfrm_dump_info info; + + BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) > + sizeof(cb->args) - sizeof(cb->args[0])); + + info.in_skb = cb->skb; + info.out_skb = skb; + info.nlmsg_seq = cb->nlh->nlmsg_seq; + info.nlmsg_flags = NLM_F_MULTI; + + if (!cb->args[0]) { + cb->args[0] = 1; + xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); + } + + (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); + + return skb->len; +} + +static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, + struct xfrm_policy *xp, + int dir, u32 seq) +{ + struct xfrm_dump_info info; + struct sk_buff *skb; + int err; + + skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); + if (!skb) + return ERR_PTR(-ENOMEM); + + info.in_skb = in_skb; + info.out_skb = skb; + info.nlmsg_seq = seq; + info.nlmsg_flags = 0; + + err = dump_one_policy(xp, dir, 0, &info); + if (err) { + kfree_skb(skb); + return ERR_PTR(err); + } + + return skb; +} + +static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_policy *xp; + struct xfrm_userpolicy_id *p; + u8 type = XFRM_POLICY_TYPE_MAIN; + int err; + struct km_event c; + int delete; + struct xfrm_mark m; + u32 mark = xfrm_mark_get(attrs, &m); + + p = nlmsg_data(nlh); + delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; + + err = copy_from_user_policy_type(&type, attrs); + if (err) + return err; + + err = verify_policy_dir(p->dir); + if (err) + return err; + + if (p->index) + xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err); + else { + struct nlattr *rt = attrs[XFRMA_SEC_CTX]; + struct xfrm_sec_ctx *ctx; + + err = verify_sec_ctx_len(attrs); + if (err) + return err; + + ctx = NULL; + if (rt) { + struct xfrm_user_sec_ctx *uctx = nla_data(rt); + + err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); + if (err) + return err; + } + xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel, + ctx, delete, &err); + security_xfrm_policy_free(ctx); + } + if (xp == NULL) + return -ENOENT; + + if (!delete) { + struct sk_buff *resp_skb; + + resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); + if (IS_ERR(resp_skb)) { + err = PTR_ERR(resp_skb); + } else { + err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, + NETLINK_CB(skb).portid); + } + } else { + xfrm_audit_policy_delete(xp, err ? 0 : 1, true); + + if (err != 0) + goto out; + + c.data.byid = p->index; + c.event = nlh->nlmsg_type; + c.seq = nlh->nlmsg_seq; + c.portid = nlh->nlmsg_pid; + km_policy_notify(xp, p->dir, &c); + } + +out: + xfrm_pol_put(xp); + if (delete && err == 0) + xfrm_garbage_collect(net); + return err; +} + +static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs) +{ + struct net *net = sock_net(skb->sk); + struct km_event c; + struct xfrm_usersa_flush *p = nlmsg_data(nlh); + int err; + + err = xfrm_state_flush(net, p->proto, true); + if (err) { + if (err == -ESRCH) /* empty table */ + return 0; + return err; + } + c.data.proto = p->proto; + c.event = nlh->nlmsg_type; + c.seq = nlh->nlmsg_seq; + c.portid = nlh->nlmsg_pid; + c.net = net; + km_state_notify(NULL, &c); + + return 0; +} + +static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x) +{ + size_t replay_size = x->replay_esn ? + xfrm_replay_state_esn_len(x->replay_esn) : + sizeof(struct xfrm_replay_state); + + return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) + + nla_total_size(replay_size) + + nla_total_size(sizeof(struct xfrm_lifetime_cur)) + + nla_total_size(sizeof(struct xfrm_mark)) + + nla_total_size(4) /* XFRM_AE_RTHR */ + + nla_total_size(4); /* XFRM_AE_ETHR */ +} + +static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) +{ + struct xfrm_aevent_id *id; + struct nlmsghdr *nlh; + int err; + + nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); + if (nlh == NULL) + return -EMSGSIZE; + + id = nlmsg_data(nlh); + memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr)); + id->sa_id.spi = x->id.spi; + id->sa_id.family = x->props.family; + id->sa_id.proto = x->id.proto; + memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr)); + id->reqid = x->props.reqid; + id->flags = c->data.aevent; + + if (x->replay_esn) { + err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, + xfrm_replay_state_esn_len(x->replay_esn), + x->replay_esn); + } else { + err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), + &x->replay); + } + if (err) + goto out_cancel; + err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft); + if (err) + goto out_cancel; + + if (id->flags & XFRM_AE_RTHR) { + err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); + if (err) + goto out_cancel; + } + if (id->flags & XFRM_AE_ETHR) { + err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, + x->replay_maxage * 10 / HZ); + if (err) + goto out_cancel; + } + err = xfrm_mark_put(skb, &x->mark); + if (err) + goto out_cancel; + + nlmsg_end(skb, nlh); + return 0; + +out_cancel: + nlmsg_cancel(skb, nlh); + return err; +} + +static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_state *x; + struct sk_buff *r_skb; + int err; + struct km_event c; + u32 mark; + struct xfrm_mark m; + struct xfrm_aevent_id *p = nlmsg_data(nlh); + struct xfrm_usersa_id *id = &p->sa_id; + + mark = xfrm_mark_get(attrs, &m); + + x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); + if (x == NULL) + return -ESRCH; + + r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); + if (r_skb == NULL) { + xfrm_state_put(x); + return -ENOMEM; + } + + /* + * XXX: is this lock really needed - none of the other + * gets lock (the concern is things getting updated + * while we are still reading) - jhs + */ + spin_lock_bh(&x->lock); + c.data.aevent = p->flags; + c.seq = nlh->nlmsg_seq; + c.portid = nlh->nlmsg_pid; + + if (build_aevent(r_skb, x, &c) < 0) + BUG(); + err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); + spin_unlock_bh(&x->lock); + xfrm_state_put(x); + return err; +} + +static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_state *x; + struct km_event c; + int err = -EINVAL; + u32 mark = 0; + struct xfrm_mark m; + struct xfrm_aevent_id *p = nlmsg_data(nlh); + struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; + struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; + struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; + + if (!lt && !rp && !re) + return err; + + /* pedantic mode - thou shalt sayeth replaceth */ + if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) + return err; + + mark = xfrm_mark_get(attrs, &m); + + x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); + if (x == NULL) + return -ESRCH; + + if (x->km.state != XFRM_STATE_VALID) + goto out; + + err = xfrm_replay_verify_len(x->replay_esn, re); + if (err) + goto out; + + spin_lock_bh(&x->lock); + xfrm_update_ae_params(x, attrs, 1); + spin_unlock_bh(&x->lock); + + c.event = nlh->nlmsg_type; + c.seq = nlh->nlmsg_seq; + c.portid = nlh->nlmsg_pid; + c.data.aevent = XFRM_AE_CU; + km_state_notify(x, &c); + err = 0; +out: + xfrm_state_put(x); + return err; +} + +static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs) +{ + struct net *net = sock_net(skb->sk); + struct km_event c; + u8 type = XFRM_POLICY_TYPE_MAIN; + int err; + + err = copy_from_user_policy_type(&type, attrs); + if (err) + return err; + + err = xfrm_policy_flush(net, type, true); + if (err) { + if (err == -ESRCH) /* empty table */ + return 0; + return err; + } + + c.data.type = type; + c.event = nlh->nlmsg_type; + c.seq = nlh->nlmsg_seq; + c.portid = nlh->nlmsg_pid; + c.net = net; + km_policy_notify(NULL, 0, &c); + return 0; +} + +static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_policy *xp; + struct xfrm_user_polexpire *up = nlmsg_data(nlh); + struct xfrm_userpolicy_info *p = &up->pol; + u8 type = XFRM_POLICY_TYPE_MAIN; + int err = -ENOENT; + struct xfrm_mark m; + u32 mark = xfrm_mark_get(attrs, &m); + + err = copy_from_user_policy_type(&type, attrs); + if (err) + return err; + + err = verify_policy_dir(p->dir); + if (err) + return err; + + if (p->index) + xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err); + else { + struct nlattr *rt = attrs[XFRMA_SEC_CTX]; + struct xfrm_sec_ctx *ctx; + + err = verify_sec_ctx_len(attrs); + if (err) + return err; + + ctx = NULL; + if (rt) { + struct xfrm_user_sec_ctx *uctx = nla_data(rt); + + err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); + if (err) + return err; + } + xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, + &p->sel, ctx, 0, &err); + security_xfrm_policy_free(ctx); + } + if (xp == NULL) + return -ENOENT; + + if (unlikely(xp->walk.dead)) + goto out; + + err = 0; + if (up->hard) { + xfrm_policy_delete(xp, p->dir); + xfrm_audit_policy_delete(xp, 1, true); + } else { + // reset the timers here? + WARN(1, "Dont know what to do with soft policy expire\n"); + } + km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); + +out: + xfrm_pol_put(xp); + return err; +} + +static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_state *x; + int err; + struct xfrm_user_expire *ue = nlmsg_data(nlh); + struct xfrm_usersa_info *p = &ue->state; + struct xfrm_mark m; + u32 mark = xfrm_mark_get(attrs, &m); + + x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); + + err = -ENOENT; + if (x == NULL) + return err; + + spin_lock_bh(&x->lock); + err = -EINVAL; + if (x->km.state != XFRM_STATE_VALID) + goto out; + km_state_expired(x, ue->hard, nlh->nlmsg_pid); + + if (ue->hard) { + __xfrm_state_delete(x); + xfrm_audit_state_delete(x, 1, true); + } + err = 0; +out: + spin_unlock_bh(&x->lock); + xfrm_state_put(x); + return err; +} + +static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_policy *xp; + struct xfrm_user_tmpl *ut; + int i; + struct nlattr *rt = attrs[XFRMA_TMPL]; + struct xfrm_mark mark; + + struct xfrm_user_acquire *ua = nlmsg_data(nlh); + struct xfrm_state *x = xfrm_state_alloc(net); + int err = -ENOMEM; + + if (!x) + goto nomem; + + xfrm_mark_get(attrs, &mark); + + err = verify_newpolicy_info(&ua->policy); + if (err) + goto bad_policy; + + /* build an XP */ + xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); + if (!xp) + goto free_state; + + memcpy(&x->id, &ua->id, sizeof(ua->id)); + memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); + memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); + xp->mark.m = x->mark.m = mark.m; + xp->mark.v = x->mark.v = mark.v; + ut = nla_data(rt); + /* extract the templates and for each call km_key */ + for (i = 0; i < xp->xfrm_nr; i++, ut++) { + struct xfrm_tmpl *t = &xp->xfrm_vec[i]; + memcpy(&x->id, &t->id, sizeof(x->id)); + x->props.mode = t->mode; + x->props.reqid = t->reqid; + x->props.family = ut->family; + t->aalgos = ua->aalgos; + t->ealgos = ua->ealgos; + t->calgos = ua->calgos; + err = km_query(x, t, xp); + + } + + kfree(x); + kfree(xp); + + return 0; + +bad_policy: + WARN(1, "BAD policy passed\n"); +free_state: + kfree(x); +nomem: + return err; +} + +#ifdef CONFIG_XFRM_MIGRATE +static int copy_from_user_migrate(struct xfrm_migrate *ma, + struct xfrm_kmaddress *k, + struct nlattr **attrs, int *num) +{ + struct nlattr *rt = attrs[XFRMA_MIGRATE]; + struct xfrm_user_migrate *um; + int i, num_migrate; + + if (k != NULL) { + struct xfrm_user_kmaddress *uk; + + uk = nla_data(attrs[XFRMA_KMADDRESS]); + memcpy(&k->local, &uk->local, sizeof(k->local)); + memcpy(&k->remote, &uk->remote, sizeof(k->remote)); + k->family = uk->family; + k->reserved = uk->reserved; + } + + um = nla_data(rt); + num_migrate = nla_len(rt) / sizeof(*um); + + if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) + return -EINVAL; + + for (i = 0; i < num_migrate; i++, um++, ma++) { + memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); + memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); + memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); + memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); + + ma->proto = um->proto; + ma->mode = um->mode; + ma->reqid = um->reqid; + + ma->old_family = um->old_family; + ma->new_family = um->new_family; + } + + *num = i; + return 0; +} + +static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs) +{ + struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); + struct xfrm_migrate m[XFRM_MAX_DEPTH]; + struct xfrm_kmaddress km, *kmp; + u8 type; + int err; + int n = 0; + struct net *net = sock_net(skb->sk); + + if (attrs[XFRMA_MIGRATE] == NULL) + return -EINVAL; + + kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; + + err = copy_from_user_policy_type(&type, attrs); + if (err) + return err; + + err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); + if (err) + return err; + + if (!n) + return 0; + + xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net); + + return 0; +} +#else +static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs) +{ + return -ENOPROTOOPT; +} +#endif + +#ifdef CONFIG_XFRM_MIGRATE +static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) +{ + struct xfrm_user_migrate um; + + memset(&um, 0, sizeof(um)); + um.proto = m->proto; + um.mode = m->mode; + um.reqid = m->reqid; + um.old_family = m->old_family; + memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); + memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); + um.new_family = m->new_family; + memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); + memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); + + return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); +} + +static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) +{ + struct xfrm_user_kmaddress uk; + + memset(&uk, 0, sizeof(uk)); + uk.family = k->family; + uk.reserved = k->reserved; + memcpy(&uk.local, &k->local, sizeof(uk.local)); + memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); + + return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); +} + +static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma) +{ + return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) + + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) + + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) + + userpolicy_type_attrsize(); +} + +static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, + int num_migrate, const struct xfrm_kmaddress *k, + const struct xfrm_selector *sel, u8 dir, u8 type) +{ + const struct xfrm_migrate *mp; + struct xfrm_userpolicy_id *pol_id; + struct nlmsghdr *nlh; + int i, err; + + nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); + if (nlh == NULL) + return -EMSGSIZE; + + pol_id = nlmsg_data(nlh); + /* copy data from selector, dir, and type to the pol_id */ + memset(pol_id, 0, sizeof(*pol_id)); + memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); + pol_id->dir = dir; + + if (k != NULL) { + err = copy_to_user_kmaddress(k, skb); + if (err) + goto out_cancel; + } + err = copy_to_user_policy_type(type, skb); + if (err) + goto out_cancel; + for (i = 0, mp = m ; i < num_migrate; i++, mp++) { + err = copy_to_user_migrate(mp, skb); + if (err) + goto out_cancel; + } + + nlmsg_end(skb, nlh); + return 0; + +out_cancel: + nlmsg_cancel(skb, nlh); + return err; +} + +static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, + const struct xfrm_migrate *m, int num_migrate, + const struct xfrm_kmaddress *k) +{ + struct net *net = &init_net; + struct sk_buff *skb; + + skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + /* build migrate */ + if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0) + BUG(); + + return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE); +} +#else +static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, + const struct xfrm_migrate *m, int num_migrate, + const struct xfrm_kmaddress *k) +{ + return -ENOPROTOOPT; +} +#endif + +#define XMSGSIZE(type) sizeof(struct type) + +static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { + [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), + [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), + [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), + [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), + [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), + [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), + [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), + [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), + [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), + [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), + [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), + [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), + [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), + [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, + [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), + [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), + [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), + [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), + [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), + [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32), + [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), +}; + +#undef XMSGSIZE + +static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { + [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, + [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, + [XFRMA_LASTUSED] = { .type = NLA_U64}, + [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, + [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, + [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, + [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, + [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, + [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, + [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, + [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, + [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, + [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, + [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, + [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, + [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, + [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, + [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, + [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, + [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, + [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, + [XFRMA_TFCPAD] = { .type = NLA_U32 }, + [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, + [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, + [XFRMA_PROTO] = { .type = NLA_U8 }, + [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, +}; + +static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = { + [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, + [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, +}; + +static const struct xfrm_link { + int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); + int (*dump)(struct sk_buff *, struct netlink_callback *); + int (*done)(struct netlink_callback *); + const struct nla_policy *nla_pol; + int nla_max; +} xfrm_dispatch[XFRM_NR_MSGTYPES] = { + [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, + [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, + [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, + .dump = xfrm_dump_sa, + .done = xfrm_dump_sa_done }, + [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, + [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, + [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, + .dump = xfrm_dump_policy, + .done = xfrm_dump_policy_done }, + [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, + [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, + [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, + [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, + [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, + [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, + [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, + [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, + [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, + [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, + [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, + [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, + [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo, + .nla_pol = xfrma_spd_policy, + .nla_max = XFRMA_SPD_MAX }, + [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, +}; + +static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) +{ + struct net *net = sock_net(skb->sk); + struct nlattr *attrs[XFRMA_MAX+1]; + const struct xfrm_link *link; + int type, err; + +#ifdef CONFIG_COMPAT + if (is_compat_task()) + return -ENOTSUPP; +#endif + + type = nlh->nlmsg_type; + if (type > XFRM_MSG_MAX) + return -EINVAL; + + type -= XFRM_MSG_BASE; + link = &xfrm_dispatch[type]; + + /* All operations require privileges, even GET */ + if (!netlink_net_capable(skb, CAP_NET_ADMIN)) + return -EPERM; + + if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || + type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && + (nlh->nlmsg_flags & NLM_F_DUMP)) { + if (link->dump == NULL) + return -EINVAL; + + { + struct netlink_dump_control c = { + .dump = link->dump, + .done = link->done, + }; + return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); + } + } + + err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, + link->nla_max ? : XFRMA_MAX, + link->nla_pol ? : xfrma_policy); + if (err < 0) + return err; + + if (link->doit == NULL) + return -EINVAL; + + return link->doit(skb, nlh, attrs); +} + +static void xfrm_netlink_rcv(struct sk_buff *skb) +{ + struct net *net = sock_net(skb->sk); + + mutex_lock(&net->xfrm.xfrm_cfg_mutex); + netlink_rcv_skb(skb, &xfrm_user_rcv_msg); + mutex_unlock(&net->xfrm.xfrm_cfg_mutex); +} + +static inline size_t xfrm_expire_msgsize(void) +{ + return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) + + nla_total_size(sizeof(struct xfrm_mark)); +} + +static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) +{ + struct xfrm_user_expire *ue; + struct nlmsghdr *nlh; + int err; + + nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); + if (nlh == NULL) + return -EMSGSIZE; + + ue = nlmsg_data(nlh); + copy_to_user_state(x, &ue->state); + ue->hard = (c->data.hard != 0) ? 1 : 0; + + err = xfrm_mark_put(skb, &x->mark); + if (err) + return err; + + nlmsg_end(skb, nlh); + return 0; +} + +static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) +{ + struct net *net = xs_net(x); + struct sk_buff *skb; + + skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + if (build_expire(skb, x, c) < 0) { + kfree_skb(skb); + return -EMSGSIZE; + } + + return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); +} + +static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) +{ + struct net *net = xs_net(x); + struct sk_buff *skb; + + skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + if (build_aevent(skb, x, c) < 0) + BUG(); + + return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS); +} + +static int xfrm_notify_sa_flush(const struct km_event *c) +{ + struct net *net = c->net; + struct xfrm_usersa_flush *p; + struct nlmsghdr *nlh; + struct sk_buff *skb; + int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); + + skb = nlmsg_new(len, GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); + if (nlh == NULL) { + kfree_skb(skb); + return -EMSGSIZE; + } + + p = nlmsg_data(nlh); + p->proto = c->data.proto; + + nlmsg_end(skb, nlh); + + return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); +} + +static inline size_t xfrm_sa_len(struct xfrm_state *x) +{ + size_t l = 0; + if (x->aead) + l += nla_total_size(aead_len(x->aead)); + if (x->aalg) { + l += nla_total_size(sizeof(struct xfrm_algo) + + (x->aalg->alg_key_len + 7) / 8); + l += nla_total_size(xfrm_alg_auth_len(x->aalg)); + } + if (x->ealg) + l += nla_total_size(xfrm_alg_len(x->ealg)); + if (x->calg) + l += nla_total_size(sizeof(*x->calg)); + if (x->encap) + l += nla_total_size(sizeof(*x->encap)); + if (x->tfcpad) + l += nla_total_size(sizeof(x->tfcpad)); + if (x->replay_esn) + l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); + else + l += nla_total_size(sizeof(struct xfrm_replay_state)); + if (x->security) + l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + + x->security->ctx_len); + if (x->coaddr) + l += nla_total_size(sizeof(*x->coaddr)); + if (x->props.extra_flags) + l += nla_total_size(sizeof(x->props.extra_flags)); + + /* Must count x->lastused as it may become non-zero behind our back. */ + l += nla_total_size(sizeof(u64)); + + return l; +} + +static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) +{ + struct net *net = xs_net(x); + struct xfrm_usersa_info *p; + struct xfrm_usersa_id *id; + struct nlmsghdr *nlh; + struct sk_buff *skb; + int len = xfrm_sa_len(x); + int headlen, err; + + headlen = sizeof(*p); + if (c->event == XFRM_MSG_DELSA) { + len += nla_total_size(headlen); + headlen = sizeof(*id); + len += nla_total_size(sizeof(struct xfrm_mark)); + } + len += NLMSG_ALIGN(headlen); + + skb = nlmsg_new(len, GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); + err = -EMSGSIZE; + if (nlh == NULL) + goto out_free_skb; + + p = nlmsg_data(nlh); + if (c->event == XFRM_MSG_DELSA) { + struct nlattr *attr; + + id = nlmsg_data(nlh); + memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); + id->spi = x->id.spi; + id->family = x->props.family; + id->proto = x->id.proto; + + attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); + err = -EMSGSIZE; + if (attr == NULL) + goto out_free_skb; + + p = nla_data(attr); + } + err = copy_to_user_state_extra(x, p, skb); + if (err) + goto out_free_skb; + + nlmsg_end(skb, nlh); + + return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); + +out_free_skb: + kfree_skb(skb); + return err; +} + +static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) +{ + + switch (c->event) { + case XFRM_MSG_EXPIRE: + return xfrm_exp_state_notify(x, c); + case XFRM_MSG_NEWAE: + return xfrm_aevent_state_notify(x, c); + case XFRM_MSG_DELSA: + case XFRM_MSG_UPDSA: + case XFRM_MSG_NEWSA: + return xfrm_notify_sa(x, c); + case XFRM_MSG_FLUSHSA: + return xfrm_notify_sa_flush(c); + default: + printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", + c->event); + break; + } + + return 0; + +} + +static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x, + struct xfrm_policy *xp) +{ + return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) + + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) + + nla_total_size(sizeof(struct xfrm_mark)) + + nla_total_size(xfrm_user_sec_ctx_size(x->security)) + + userpolicy_type_attrsize(); +} + +static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, + struct xfrm_tmpl *xt, struct xfrm_policy *xp) +{ + __u32 seq = xfrm_get_acqseq(); + struct xfrm_user_acquire *ua; + struct nlmsghdr *nlh; + int err; + + nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); + if (nlh == NULL) + return -EMSGSIZE; + + ua = nlmsg_data(nlh); + memcpy(&ua->id, &x->id, sizeof(ua->id)); + memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); + memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); + copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT); + ua->aalgos = xt->aalgos; + ua->ealgos = xt->ealgos; + ua->calgos = xt->calgos; + ua->seq = x->km.seq = seq; + + err = copy_to_user_tmpl(xp, skb); + if (!err) + err = copy_to_user_state_sec_ctx(x, skb); + if (!err) + err = copy_to_user_policy_type(xp->type, skb); + if (!err) + err = xfrm_mark_put(skb, &xp->mark); + if (err) { + nlmsg_cancel(skb, nlh); + return err; + } + + nlmsg_end(skb, nlh); + return 0; +} + +static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, + struct xfrm_policy *xp) +{ + struct net *net = xs_net(x); + struct sk_buff *skb; + + skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + if (build_acquire(skb, x, xt, xp) < 0) + BUG(); + + return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE); +} + +/* User gives us xfrm_user_policy_info followed by an array of 0 + * or more templates. + */ +static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, + u8 *data, int len, int *dir) +{ + struct net *net = sock_net(sk); + struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; + struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); + struct xfrm_policy *xp; + int nr; + + switch (sk->sk_family) { + case AF_INET: + if (opt != IP_XFRM_POLICY) { + *dir = -EOPNOTSUPP; + return NULL; + } + break; +#if IS_ENABLED(CONFIG_IPV6) + case AF_INET6: + if (opt != IPV6_XFRM_POLICY) { + *dir = -EOPNOTSUPP; + return NULL; + } + break; +#endif + default: + *dir = -EINVAL; + return NULL; + } + + *dir = -EINVAL; + + if (len < sizeof(*p) || + verify_newpolicy_info(p)) + return NULL; + + nr = ((len - sizeof(*p)) / sizeof(*ut)); + if (validate_tmpl(nr, ut, p->sel.family)) + return NULL; + + if (p->dir > XFRM_POLICY_OUT) + return NULL; + + xp = xfrm_policy_alloc(net, GFP_ATOMIC); + if (xp == NULL) { + *dir = -ENOBUFS; + return NULL; + } + + copy_from_user_policy(xp, p); + xp->type = XFRM_POLICY_TYPE_MAIN; + copy_templates(xp, ut, nr); + + *dir = p->dir; + + return xp; +} + +static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp) +{ + return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) + + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) + + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) + + nla_total_size(sizeof(struct xfrm_mark)) + + userpolicy_type_attrsize(); +} + +static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, + int dir, const struct km_event *c) +{ + struct xfrm_user_polexpire *upe; + int hard = c->data.hard; + struct nlmsghdr *nlh; + int err; + + nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); + if (nlh == NULL) + return -EMSGSIZE; + + upe = nlmsg_data(nlh); + copy_to_user_policy(xp, &upe->pol, dir); + err = copy_to_user_tmpl(xp, skb); + if (!err) + err = copy_to_user_sec_ctx(xp, skb); + if (!err) + err = copy_to_user_policy_type(xp->type, skb); + if (!err) + err = xfrm_mark_put(skb, &xp->mark); + if (err) { + nlmsg_cancel(skb, nlh); + return err; + } + upe->hard = !!hard; + + nlmsg_end(skb, nlh); + return 0; +} + +static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) +{ + struct net *net = xp_net(xp); + struct sk_buff *skb; + + skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + if (build_polexpire(skb, xp, dir, c) < 0) + BUG(); + + return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); +} + +static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) +{ + int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); + struct net *net = xp_net(xp); + struct xfrm_userpolicy_info *p; + struct xfrm_userpolicy_id *id; + struct nlmsghdr *nlh; + struct sk_buff *skb; + int headlen, err; + + headlen = sizeof(*p); + if (c->event == XFRM_MSG_DELPOLICY) { + len += nla_total_size(headlen); + headlen = sizeof(*id); + } + len += userpolicy_type_attrsize(); + len += nla_total_size(sizeof(struct xfrm_mark)); + len += NLMSG_ALIGN(headlen); + + skb = nlmsg_new(len, GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); + err = -EMSGSIZE; + if (nlh == NULL) + goto out_free_skb; + + p = nlmsg_data(nlh); + if (c->event == XFRM_MSG_DELPOLICY) { + struct nlattr *attr; + + id = nlmsg_data(nlh); + memset(id, 0, sizeof(*id)); + id->dir = dir; + if (c->data.byid) + id->index = xp->index; + else + memcpy(&id->sel, &xp->selector, sizeof(id->sel)); + + attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); + err = -EMSGSIZE; + if (attr == NULL) + goto out_free_skb; + + p = nla_data(attr); + } + + copy_to_user_policy(xp, p, dir); + err = copy_to_user_tmpl(xp, skb); + if (!err) + err = copy_to_user_policy_type(xp->type, skb); + if (!err) + err = xfrm_mark_put(skb, &xp->mark); + if (err) + goto out_free_skb; + + nlmsg_end(skb, nlh); + + return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); + +out_free_skb: + kfree_skb(skb); + return err; +} + +static int xfrm_notify_policy_flush(const struct km_event *c) +{ + struct net *net = c->net; + struct nlmsghdr *nlh; + struct sk_buff *skb; + int err; + + skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); + err = -EMSGSIZE; + if (nlh == NULL) + goto out_free_skb; + err = copy_to_user_policy_type(c->data.type, skb); + if (err) + goto out_free_skb; + + nlmsg_end(skb, nlh); + + return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); + +out_free_skb: + kfree_skb(skb); + return err; +} + +static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) +{ + + switch (c->event) { + case XFRM_MSG_NEWPOLICY: + case XFRM_MSG_UPDPOLICY: + case XFRM_MSG_DELPOLICY: + return xfrm_notify_policy(xp, dir, c); + case XFRM_MSG_FLUSHPOLICY: + return xfrm_notify_policy_flush(c); + case XFRM_MSG_POLEXPIRE: + return xfrm_exp_policy_notify(xp, dir, c); + default: + printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", + c->event); + } + + return 0; + +} + +static inline size_t xfrm_report_msgsize(void) +{ + return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); +} + +static int build_report(struct sk_buff *skb, u8 proto, + struct xfrm_selector *sel, xfrm_address_t *addr) +{ + struct xfrm_user_report *ur; + struct nlmsghdr *nlh; + + nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); + if (nlh == NULL) + return -EMSGSIZE; + + ur = nlmsg_data(nlh); + ur->proto = proto; + memcpy(&ur->sel, sel, sizeof(ur->sel)); + + if (addr) { + int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); + if (err) { + nlmsg_cancel(skb, nlh); + return err; + } + } + nlmsg_end(skb, nlh); + return 0; +} + +static int xfrm_send_report(struct net *net, u8 proto, + struct xfrm_selector *sel, xfrm_address_t *addr) +{ + struct sk_buff *skb; + + skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + if (build_report(skb, proto, sel, addr) < 0) + BUG(); + + return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT); +} + +static inline size_t xfrm_mapping_msgsize(void) +{ + return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); +} + +static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, + xfrm_address_t *new_saddr, __be16 new_sport) +{ + struct xfrm_user_mapping *um; + struct nlmsghdr *nlh; + + nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); + if (nlh == NULL) + return -EMSGSIZE; + + um = nlmsg_data(nlh); + + memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); + um->id.spi = x->id.spi; + um->id.family = x->props.family; + um->id.proto = x->id.proto; + memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); + memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); + um->new_sport = new_sport; + um->old_sport = x->encap->encap_sport; + um->reqid = x->props.reqid; + + nlmsg_end(skb, nlh); + return 0; +} + +static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, + __be16 sport) +{ + struct net *net = xs_net(x); + struct sk_buff *skb; + + if (x->id.proto != IPPROTO_ESP) + return -EINVAL; + + if (!x->encap) + return -EINVAL; + + skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + if (build_mapping(skb, x, ipaddr, sport) < 0) + BUG(); + + return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING); +} + +static bool xfrm_is_alive(const struct km_event *c) +{ + return (bool)xfrm_acquire_is_on(c->net); +} + +static struct xfrm_mgr netlink_mgr = { + .id = "netlink", + .notify = xfrm_send_state_notify, + .acquire = xfrm_send_acquire, + .compile_policy = xfrm_compile_policy, + .notify_policy = xfrm_send_policy_notify, + .report = xfrm_send_report, + .migrate = xfrm_send_migrate, + .new_mapping = xfrm_send_mapping, + .is_alive = xfrm_is_alive, +}; + +static int __net_init xfrm_user_net_init(struct net *net) +{ + struct sock *nlsk; + struct netlink_kernel_cfg cfg = { + .groups = XFRMNLGRP_MAX, + .input = xfrm_netlink_rcv, + }; + + nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg); + if (nlsk == NULL) + return -ENOMEM; + net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ + rcu_assign_pointer(net->xfrm.nlsk, nlsk); + return 0; +} + +static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) +{ + struct net *net; + list_for_each_entry(net, net_exit_list, exit_list) + RCU_INIT_POINTER(net->xfrm.nlsk, NULL); + synchronize_net(); + list_for_each_entry(net, net_exit_list, exit_list) + netlink_kernel_release(net->xfrm.nlsk_stash); +} + +static struct pernet_operations xfrm_user_net_ops = { + .init = xfrm_user_net_init, + .exit_batch = xfrm_user_net_exit, +}; + +static int __init xfrm_user_init(void) +{ + int rv; + + printk(KERN_INFO "Initializing XFRM netlink socket\n"); + + rv = register_pernet_subsys(&xfrm_user_net_ops); + if (rv < 0) + return rv; + rv = xfrm_register_km(&netlink_mgr); + if (rv < 0) + unregister_pernet_subsys(&xfrm_user_net_ops); + return rv; +} + +static void __exit xfrm_user_exit(void) +{ + xfrm_unregister_km(&netlink_mgr); + unregister_pernet_subsys(&xfrm_user_net_ops); +} + +module_init(xfrm_user_init); +module_exit(xfrm_user_exit); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); + -- cgit 1.2.3-korg