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/ipv4/netfilter/nf_defrag_ipv4.c | 129 +++++++++++++++++++++++++++++ 1 file changed, 129 insertions(+) create mode 100644 kernel/net/ipv4/netfilter/nf_defrag_ipv4.c (limited to 'kernel/net/ipv4/netfilter/nf_defrag_ipv4.c') diff --git a/kernel/net/ipv4/netfilter/nf_defrag_ipv4.c b/kernel/net/ipv4/netfilter/nf_defrag_ipv4.c new file mode 100644 index 000000000..c88b7d434 --- /dev/null +++ b/kernel/net/ipv4/netfilter/nf_defrag_ipv4.c @@ -0,0 +1,129 @@ +/* (C) 1999-2001 Paul `Rusty' Russell + * (C) 2002-2004 Netfilter Core Team + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#if IS_ENABLED(CONFIG_NF_CONNTRACK) +#include +#endif +#include + +static int nf_ct_ipv4_gather_frags(struct sk_buff *skb, u_int32_t user) +{ + int err; + + skb_orphan(skb); + + local_bh_disable(); + err = ip_defrag(skb, user); + local_bh_enable(); + + if (!err) { + ip_send_check(ip_hdr(skb)); + skb->ignore_df = 1; + } + + return err; +} + +static enum ip_defrag_users nf_ct_defrag_user(unsigned int hooknum, + struct sk_buff *skb) +{ + u16 zone = NF_CT_DEFAULT_ZONE; + +#if IS_ENABLED(CONFIG_NF_CONNTRACK) + if (skb->nfct) + zone = nf_ct_zone((struct nf_conn *)skb->nfct); +#endif + +#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) + if (skb->nf_bridge && + skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING) + return IP_DEFRAG_CONNTRACK_BRIDGE_IN + zone; +#endif + if (hooknum == NF_INET_PRE_ROUTING) + return IP_DEFRAG_CONNTRACK_IN + zone; + else + return IP_DEFRAG_CONNTRACK_OUT + zone; +} + +static unsigned int ipv4_conntrack_defrag(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct nf_hook_state *state) +{ + struct sock *sk = skb->sk; + struct inet_sock *inet = inet_sk(skb->sk); + + if (sk && (sk->sk_family == PF_INET) && + inet->nodefrag) + return NF_ACCEPT; + +#if IS_ENABLED(CONFIG_NF_CONNTRACK) +#if !IS_ENABLED(CONFIG_NF_NAT) + /* Previously seen (loopback)? Ignore. Do this before + fragment check. */ + if (skb->nfct && !nf_ct_is_template((struct nf_conn *)skb->nfct)) + return NF_ACCEPT; +#endif +#endif + /* Gather fragments. */ + if (ip_is_fragment(ip_hdr(skb))) { + enum ip_defrag_users user = + nf_ct_defrag_user(ops->hooknum, skb); + + if (nf_ct_ipv4_gather_frags(skb, user)) + return NF_STOLEN; + } + return NF_ACCEPT; +} + +static struct nf_hook_ops ipv4_defrag_ops[] = { + { + .hook = ipv4_conntrack_defrag, + .owner = THIS_MODULE, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_PRE_ROUTING, + .priority = NF_IP_PRI_CONNTRACK_DEFRAG, + }, + { + .hook = ipv4_conntrack_defrag, + .owner = THIS_MODULE, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_LOCAL_OUT, + .priority = NF_IP_PRI_CONNTRACK_DEFRAG, + }, +}; + +static int __init nf_defrag_init(void) +{ + return nf_register_hooks(ipv4_defrag_ops, ARRAY_SIZE(ipv4_defrag_ops)); +} + +static void __exit nf_defrag_fini(void) +{ + nf_unregister_hooks(ipv4_defrag_ops, ARRAY_SIZE(ipv4_defrag_ops)); +} + +void nf_defrag_ipv4_enable(void) +{ +} +EXPORT_SYMBOL_GPL(nf_defrag_ipv4_enable); + +module_init(nf_defrag_init); +module_exit(nf_defrag_fini); + +MODULE_LICENSE("GPL"); -- cgit 1.2.3-korg