diff options
author | 2015-08-04 12:17:53 -0700 | |
---|---|---|
committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/net/core/sock.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
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 <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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 <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/net/core/sock.c')
-rw-r--r-- | kernel/net/core/sock.c | 2978 |
1 files changed, 2978 insertions, 0 deletions
diff --git a/kernel/net/core/sock.c b/kernel/net/core/sock.c new file mode 100644 index 000000000..6317c7149 --- /dev/null +++ b/kernel/net/core/sock.c @@ -0,0 +1,2978 @@ +/* + * INET An implementation of the TCP/IP protocol suite for the LINUX + * operating system. INET is implemented using the BSD Socket + * interface as the means of communication with the user level. + * + * Generic socket support routines. Memory allocators, socket lock/release + * handler for protocols to use and generic option handler. + * + * + * Authors: Ross Biro + * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> + * Florian La Roche, <flla@stud.uni-sb.de> + * Alan Cox, <A.Cox@swansea.ac.uk> + * + * Fixes: + * Alan Cox : Numerous verify_area() problems + * Alan Cox : Connecting on a connecting socket + * now returns an error for tcp. + * Alan Cox : sock->protocol is set correctly. + * and is not sometimes left as 0. + * Alan Cox : connect handles icmp errors on a + * connect properly. Unfortunately there + * is a restart syscall nasty there. I + * can't match BSD without hacking the C + * library. Ideas urgently sought! + * Alan Cox : Disallow bind() to addresses that are + * not ours - especially broadcast ones!! + * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost) + * Alan Cox : sock_wfree/sock_rfree don't destroy sockets, + * instead they leave that for the DESTROY timer. + * Alan Cox : Clean up error flag in accept + * Alan Cox : TCP ack handling is buggy, the DESTROY timer + * was buggy. Put a remove_sock() in the handler + * for memory when we hit 0. Also altered the timer + * code. The ACK stuff can wait and needs major + * TCP layer surgery. + * Alan Cox : Fixed TCP ack bug, removed remove sock + * and fixed timer/inet_bh race. + * Alan Cox : Added zapped flag for TCP + * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code + * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb + * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources + * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing. + * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so... + * Rick Sladkey : Relaxed UDP rules for matching packets. + * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support + * Pauline Middelink : identd support + * Alan Cox : Fixed connect() taking signals I think. + * Alan Cox : SO_LINGER supported + * Alan Cox : Error reporting fixes + * Anonymous : inet_create tidied up (sk->reuse setting) + * Alan Cox : inet sockets don't set sk->type! + * Alan Cox : Split socket option code + * Alan Cox : Callbacks + * Alan Cox : Nagle flag for Charles & Johannes stuff + * Alex : Removed restriction on inet fioctl + * Alan Cox : Splitting INET from NET core + * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt() + * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code + * Alan Cox : Split IP from generic code + * Alan Cox : New kfree_skbmem() + * Alan Cox : Make SO_DEBUG superuser only. + * Alan Cox : Allow anyone to clear SO_DEBUG + * (compatibility fix) + * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput. + * Alan Cox : Allocator for a socket is settable. + * Alan Cox : SO_ERROR includes soft errors. + * Alan Cox : Allow NULL arguments on some SO_ opts + * Alan Cox : Generic socket allocation to make hooks + * easier (suggested by Craig Metz). + * Michael Pall : SO_ERROR returns positive errno again + * Steve Whitehouse: Added default destructor to free + * protocol private data. + * Steve Whitehouse: Added various other default routines + * common to several socket families. + * Chris Evans : Call suser() check last on F_SETOWN + * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER. + * Andi Kleen : Add sock_kmalloc()/sock_kfree_s() + * Andi Kleen : Fix write_space callback + * Chris Evans : Security fixes - signedness again + * Arnaldo C. Melo : cleanups, use skb_queue_purge + * + * To Fix: + * + * + * 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. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/capability.h> +#include <linux/errno.h> +#include <linux/errqueue.h> +#include <linux/types.h> +#include <linux/socket.h> +#include <linux/in.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/sched.h> +#include <linux/timer.h> +#include <linux/string.h> +#include <linux/sockios.h> +#include <linux/net.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/poll.h> +#include <linux/tcp.h> +#include <linux/init.h> +#include <linux/highmem.h> +#include <linux/user_namespace.h> +#include <linux/static_key.h> +#include <linux/memcontrol.h> +#include <linux/prefetch.h> + +#include <asm/uaccess.h> + +#include <linux/netdevice.h> +#include <net/protocol.h> +#include <linux/skbuff.h> +#include <net/net_namespace.h> +#include <net/request_sock.h> +#include <net/sock.h> +#include <linux/net_tstamp.h> +#include <net/xfrm.h> +#include <linux/ipsec.h> +#include <net/cls_cgroup.h> +#include <net/netprio_cgroup.h> + +#include <linux/filter.h> + +#include <trace/events/sock.h> + +#ifdef CONFIG_INET +#include <net/tcp.h> +#endif + +#include <net/busy_poll.h> + +static DEFINE_MUTEX(proto_list_mutex); +static LIST_HEAD(proto_list); + +/** + * sk_ns_capable - General socket capability test + * @sk: Socket to use a capability on or through + * @user_ns: The user namespace of the capability to use + * @cap: The capability to use + * + * Test to see if the opener of the socket had when the socket was + * created and the current process has the capability @cap in the user + * namespace @user_ns. + */ +bool sk_ns_capable(const struct sock *sk, + struct user_namespace *user_ns, int cap) +{ + return file_ns_capable(sk->sk_socket->file, user_ns, cap) && + ns_capable(user_ns, cap); +} +EXPORT_SYMBOL(sk_ns_capable); + +/** + * sk_capable - Socket global capability test + * @sk: Socket to use a capability on or through + * @cap: The global capability to use + * + * Test to see if the opener of the socket had when the socket was + * created and the current process has the capability @cap in all user + * namespaces. + */ +bool sk_capable(const struct sock *sk, int cap) +{ + return sk_ns_capable(sk, &init_user_ns, cap); +} +EXPORT_SYMBOL(sk_capable); + +/** + * sk_net_capable - Network namespace socket capability test + * @sk: Socket to use a capability on or through + * @cap: The capability to use + * + * Test to see if the opener of the socket had when the socket was created + * and the current process has the capability @cap over the network namespace + * the socket is a member of. + */ +bool sk_net_capable(const struct sock *sk, int cap) +{ + return sk_ns_capable(sk, sock_net(sk)->user_ns, cap); +} +EXPORT_SYMBOL(sk_net_capable); + + +#ifdef CONFIG_MEMCG_KMEM +int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss) +{ + struct proto *proto; + int ret = 0; + + mutex_lock(&proto_list_mutex); + list_for_each_entry(proto, &proto_list, node) { + if (proto->init_cgroup) { + ret = proto->init_cgroup(memcg, ss); + if (ret) + goto out; + } + } + + mutex_unlock(&proto_list_mutex); + return ret; +out: + list_for_each_entry_continue_reverse(proto, &proto_list, node) + if (proto->destroy_cgroup) + proto->destroy_cgroup(memcg); + mutex_unlock(&proto_list_mutex); + return ret; +} + +void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg) +{ + struct proto *proto; + + mutex_lock(&proto_list_mutex); + list_for_each_entry_reverse(proto, &proto_list, node) + if (proto->destroy_cgroup) + proto->destroy_cgroup(memcg); + mutex_unlock(&proto_list_mutex); +} +#endif + +/* + * Each address family might have different locking rules, so we have + * one slock key per address family: + */ +static struct lock_class_key af_family_keys[AF_MAX]; +static struct lock_class_key af_family_slock_keys[AF_MAX]; + +#if defined(CONFIG_MEMCG_KMEM) +struct static_key memcg_socket_limit_enabled; +EXPORT_SYMBOL(memcg_socket_limit_enabled); +#endif + +/* + * Make lock validator output more readable. (we pre-construct these + * strings build-time, so that runtime initialization of socket + * locks is fast): + */ +static const char *const af_family_key_strings[AF_MAX+1] = { + "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , + "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", + "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , + "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , + "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , + "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , + "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , + "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , + "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , + "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , + "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , + "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" , + "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" , + "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX" +}; +static const char *const af_family_slock_key_strings[AF_MAX+1] = { + "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , + "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", + "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , + "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , + "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , + "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , + "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , + "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" , + "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , + "slock-27" , "slock-28" , "slock-AF_CAN" , + "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , + "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , + "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" , + "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX" +}; +static const char *const af_family_clock_key_strings[AF_MAX+1] = { + "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , + "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", + "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , + "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , + "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , + "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , + "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , + "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" , + "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , + "clock-27" , "clock-28" , "clock-AF_CAN" , + "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , + "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , + "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" , + "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX" +}; + +/* + * sk_callback_lock locking rules are per-address-family, + * so split the lock classes by using a per-AF key: + */ +static struct lock_class_key af_callback_keys[AF_MAX]; + +/* Take into consideration the size of the struct sk_buff overhead in the + * determination of these values, since that is non-constant across + * platforms. This makes socket queueing behavior and performance + * not depend upon such differences. + */ +#define _SK_MEM_PACKETS 256 +#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256) +#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) +#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) + +/* Run time adjustable parameters. */ +__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; +EXPORT_SYMBOL(sysctl_wmem_max); +__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; +EXPORT_SYMBOL(sysctl_rmem_max); +__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; +__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; + +/* Maximal space eaten by iovec or ancillary data plus some space */ +int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); +EXPORT_SYMBOL(sysctl_optmem_max); + +int sysctl_tstamp_allow_data __read_mostly = 1; + +struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE; +EXPORT_SYMBOL_GPL(memalloc_socks); + +/** + * sk_set_memalloc - sets %SOCK_MEMALLOC + * @sk: socket to set it on + * + * Set %SOCK_MEMALLOC on a socket for access to emergency reserves. + * It's the responsibility of the admin to adjust min_free_kbytes + * to meet the requirements + */ +void sk_set_memalloc(struct sock *sk) +{ + sock_set_flag(sk, SOCK_MEMALLOC); + sk->sk_allocation |= __GFP_MEMALLOC; + static_key_slow_inc(&memalloc_socks); +} +EXPORT_SYMBOL_GPL(sk_set_memalloc); + +void sk_clear_memalloc(struct sock *sk) +{ + sock_reset_flag(sk, SOCK_MEMALLOC); + sk->sk_allocation &= ~__GFP_MEMALLOC; + static_key_slow_dec(&memalloc_socks); + + /* + * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward + * progress of swapping. SOCK_MEMALLOC may be cleared while + * it has rmem allocations due to the last swapfile being deactivated + * but there is a risk that the socket is unusable due to exceeding + * the rmem limits. Reclaim the reserves and obey rmem limits again. + */ + sk_mem_reclaim(sk); +} +EXPORT_SYMBOL_GPL(sk_clear_memalloc); + +int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) +{ + int ret; + unsigned long pflags = current->flags; + + /* these should have been dropped before queueing */ + BUG_ON(!sock_flag(sk, SOCK_MEMALLOC)); + + current->flags |= PF_MEMALLOC; + ret = sk->sk_backlog_rcv(sk, skb); + tsk_restore_flags(current, pflags, PF_MEMALLOC); + + return ret; +} +EXPORT_SYMBOL(__sk_backlog_rcv); + +static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) +{ + struct timeval tv; + + if (optlen < sizeof(tv)) + return -EINVAL; + if (copy_from_user(&tv, optval, sizeof(tv))) + return -EFAULT; + if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) + return -EDOM; + + if (tv.tv_sec < 0) { + static int warned __read_mostly; + + *timeo_p = 0; + if (warned < 10 && net_ratelimit()) { + warned++; + pr_info("%s: `%s' (pid %d) tries to set negative timeout\n", + __func__, current->comm, task_pid_nr(current)); + } + return 0; + } + *timeo_p = MAX_SCHEDULE_TIMEOUT; + if (tv.tv_sec == 0 && tv.tv_usec == 0) + return 0; + if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) + *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); + return 0; +} + +static void sock_warn_obsolete_bsdism(const char *name) +{ + static int warned; + static char warncomm[TASK_COMM_LEN]; + if (strcmp(warncomm, current->comm) && warned < 5) { + strcpy(warncomm, current->comm); + pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n", + warncomm, name); + warned++; + } +} + +#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)) + +static void sock_disable_timestamp(struct sock *sk, unsigned long flags) +{ + if (sk->sk_flags & flags) { + sk->sk_flags &= ~flags; + if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP)) + net_disable_timestamp(); + } +} + + +int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) +{ + int err; + unsigned long flags; + struct sk_buff_head *list = &sk->sk_receive_queue; + + if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) { + atomic_inc(&sk->sk_drops); + trace_sock_rcvqueue_full(sk, skb); + return -ENOMEM; + } + + err = sk_filter(sk, skb); + if (err) + return err; + + if (!sk_rmem_schedule(sk, skb, skb->truesize)) { + atomic_inc(&sk->sk_drops); + return -ENOBUFS; + } + + skb->dev = NULL; + skb_set_owner_r(skb, sk); + + /* we escape from rcu protected region, make sure we dont leak + * a norefcounted dst + */ + skb_dst_force(skb); + + spin_lock_irqsave(&list->lock, flags); + sock_skb_set_dropcount(sk, skb); + __skb_queue_tail(list, skb); + spin_unlock_irqrestore(&list->lock, flags); + + if (!sock_flag(sk, SOCK_DEAD)) + sk->sk_data_ready(sk); + return 0; +} +EXPORT_SYMBOL(sock_queue_rcv_skb); + +int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) +{ + int rc = NET_RX_SUCCESS; + + if (sk_filter(sk, skb)) + goto discard_and_relse; + + skb->dev = NULL; + + if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { + atomic_inc(&sk->sk_drops); + goto discard_and_relse; + } + if (nested) + bh_lock_sock_nested(sk); + else + bh_lock_sock(sk); + if (!sock_owned_by_user(sk)) { + /* + * trylock + unlock semantics: + */ + mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); + + rc = sk_backlog_rcv(sk, skb); + + mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); + } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { + bh_unlock_sock(sk); + atomic_inc(&sk->sk_drops); + goto discard_and_relse; + } + + bh_unlock_sock(sk); +out: + sock_put(sk); + return rc; +discard_and_relse: + kfree_skb(skb); + goto out; +} +EXPORT_SYMBOL(sk_receive_skb); + +struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) +{ + struct dst_entry *dst = __sk_dst_get(sk); + + if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { + sk_tx_queue_clear(sk); + RCU_INIT_POINTER(sk->sk_dst_cache, NULL); + dst_release(dst); + return NULL; + } + + return dst; +} +EXPORT_SYMBOL(__sk_dst_check); + +struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) +{ + struct dst_entry *dst = sk_dst_get(sk); + + if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { + sk_dst_reset(sk); + dst_release(dst); + return NULL; + } + + return dst; +} +EXPORT_SYMBOL(sk_dst_check); + +static int sock_setbindtodevice(struct sock *sk, char __user *optval, + int optlen) +{ + int ret = -ENOPROTOOPT; +#ifdef CONFIG_NETDEVICES + struct net *net = sock_net(sk); + char devname[IFNAMSIZ]; + int index; + + /* Sorry... */ + ret = -EPERM; + if (!ns_capable(net->user_ns, CAP_NET_RAW)) + goto out; + + ret = -EINVAL; + if (optlen < 0) + goto out; + + /* Bind this socket to a particular device like "eth0", + * as specified in the passed interface name. If the + * name is "" or the option length is zero the socket + * is not bound. + */ + if (optlen > IFNAMSIZ - 1) + optlen = IFNAMSIZ - 1; + memset(devname, 0, sizeof(devname)); + + ret = -EFAULT; + if (copy_from_user(devname, optval, optlen)) + goto out; + + index = 0; + if (devname[0] != '\0') { + struct net_device *dev; + + rcu_read_lock(); + dev = dev_get_by_name_rcu(net, devname); + if (dev) + index = dev->ifindex; + rcu_read_unlock(); + ret = -ENODEV; + if (!dev) + goto out; + } + + lock_sock(sk); + sk->sk_bound_dev_if = index; + sk_dst_reset(sk); + release_sock(sk); + + ret = 0; + +out: +#endif + + return ret; +} + +static int sock_getbindtodevice(struct sock *sk, char __user *optval, + int __user *optlen, int len) +{ + int ret = -ENOPROTOOPT; +#ifdef CONFIG_NETDEVICES + struct net *net = sock_net(sk); + char devname[IFNAMSIZ]; + + if (sk->sk_bound_dev_if == 0) { + len = 0; + goto zero; + } + + ret = -EINVAL; + if (len < IFNAMSIZ) + goto out; + + ret = netdev_get_name(net, devname, sk->sk_bound_dev_if); + if (ret) + goto out; + + len = strlen(devname) + 1; + + ret = -EFAULT; + if (copy_to_user(optval, devname, len)) + goto out; + +zero: + ret = -EFAULT; + if (put_user(len, optlen)) + goto out; + + ret = 0; + +out: +#endif + + return ret; +} + +static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) +{ + if (valbool) + sock_set_flag(sk, bit); + else + sock_reset_flag(sk, bit); +} + +bool sk_mc_loop(struct sock *sk) +{ + if (dev_recursion_level()) + return false; + if (!sk) + return true; + switch (sk->sk_family) { + case AF_INET: + return inet_sk(sk)->mc_loop; +#if IS_ENABLED(CONFIG_IPV6) + case AF_INET6: + return inet6_sk(sk)->mc_loop; +#endif + } + WARN_ON(1); + return true; +} +EXPORT_SYMBOL(sk_mc_loop); + +/* + * This is meant for all protocols to use and covers goings on + * at the socket level. Everything here is generic. + */ + +int sock_setsockopt(struct socket *sock, int level, int optname, + char __user *optval, unsigned int optlen) +{ + struct sock *sk = sock->sk; + int val; + int valbool; + struct linger ling; + int ret = 0; + + /* + * Options without arguments + */ + + if (optname == SO_BINDTODEVICE) + return sock_setbindtodevice(sk, optval, optlen); + + if (optlen < sizeof(int)) + return -EINVAL; + + if (get_user(val, (int __user *)optval)) + return -EFAULT; + + valbool = val ? 1 : 0; + + lock_sock(sk); + + switch (optname) { + case SO_DEBUG: + if (val && !capable(CAP_NET_ADMIN)) + ret = -EACCES; + else + sock_valbool_flag(sk, SOCK_DBG, valbool); + break; + case SO_REUSEADDR: + sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE); + break; + case SO_REUSEPORT: + sk->sk_reuseport = valbool; + break; + case SO_TYPE: + case SO_PROTOCOL: + case SO_DOMAIN: + case SO_ERROR: + ret = -ENOPROTOOPT; + break; + case SO_DONTROUTE: + sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); + break; + case SO_BROADCAST: + sock_valbool_flag(sk, SOCK_BROADCAST, valbool); + break; + case SO_SNDBUF: + /* Don't error on this BSD doesn't and if you think + * about it this is right. Otherwise apps have to + * play 'guess the biggest size' games. RCVBUF/SNDBUF + * are treated in BSD as hints + */ + val = min_t(u32, val, sysctl_wmem_max); +set_sndbuf: + sk->sk_userlocks |= SOCK_SNDBUF_LOCK; + sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF); + /* Wake up sending tasks if we upped the value. */ + sk->sk_write_space(sk); + break; + + case SO_SNDBUFFORCE: + if (!capable(CAP_NET_ADMIN)) { + ret = -EPERM; + break; + } + goto set_sndbuf; + + case SO_RCVBUF: + /* Don't error on this BSD doesn't and if you think + * about it this is right. Otherwise apps have to + * play 'guess the biggest size' games. RCVBUF/SNDBUF + * are treated in BSD as hints + */ + val = min_t(u32, val, sysctl_rmem_max); +set_rcvbuf: + sk->sk_userlocks |= SOCK_RCVBUF_LOCK; + /* + * We double it on the way in to account for + * "struct sk_buff" etc. overhead. Applications + * assume that the SO_RCVBUF setting they make will + * allow that much actual data to be received on that + * socket. + * + * Applications are unaware that "struct sk_buff" and + * other overheads allocate from the receive buffer + * during socket buffer allocation. + * + * And after considering the possible alternatives, + * returning the value we actually used in getsockopt + * is the most desirable behavior. + */ + sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF); + break; + + case SO_RCVBUFFORCE: + if (!capable(CAP_NET_ADMIN)) { + ret = -EPERM; + break; + } + goto set_rcvbuf; + + case SO_KEEPALIVE: +#ifdef CONFIG_INET + if (sk->sk_protocol == IPPROTO_TCP && + sk->sk_type == SOCK_STREAM) + tcp_set_keepalive(sk, valbool); +#endif + sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); + break; + + case SO_OOBINLINE: + sock_valbool_flag(sk, SOCK_URGINLINE, valbool); + break; + + case SO_NO_CHECK: + sk->sk_no_check_tx = valbool; + break; + + case SO_PRIORITY: + if ((val >= 0 && val <= 6) || + ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) + sk->sk_priority = val; + else + ret = -EPERM; + break; + + case SO_LINGER: + if (optlen < sizeof(ling)) { + ret = -EINVAL; /* 1003.1g */ + break; + } + if (copy_from_user(&ling, optval, sizeof(ling))) { + ret = -EFAULT; + break; + } + if (!ling.l_onoff) + sock_reset_flag(sk, SOCK_LINGER); + else { +#if (BITS_PER_LONG == 32) + if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) + sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; + else +#endif + sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; + sock_set_flag(sk, SOCK_LINGER); + } + break; + + case SO_BSDCOMPAT: + sock_warn_obsolete_bsdism("setsockopt"); + break; + + case SO_PASSCRED: + if (valbool) + set_bit(SOCK_PASSCRED, &sock->flags); + else + clear_bit(SOCK_PASSCRED, &sock->flags); + break; + + case SO_TIMESTAMP: + case SO_TIMESTAMPNS: + if (valbool) { + if (optname == SO_TIMESTAMP) + sock_reset_flag(sk, SOCK_RCVTSTAMPNS); + else + sock_set_flag(sk, SOCK_RCVTSTAMPNS); + sock_set_flag(sk, SOCK_RCVTSTAMP); + sock_enable_timestamp(sk, SOCK_TIMESTAMP); + } else { + sock_reset_flag(sk, SOCK_RCVTSTAMP); + sock_reset_flag(sk, SOCK_RCVTSTAMPNS); + } + break; + + case SO_TIMESTAMPING: + if (val & ~SOF_TIMESTAMPING_MASK) { + ret = -EINVAL; + break; + } + + if (val & SOF_TIMESTAMPING_OPT_ID && + !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) { + if (sk->sk_protocol == IPPROTO_TCP) { + if (sk->sk_state != TCP_ESTABLISHED) { + ret = -EINVAL; + break; + } + sk->sk_tskey = tcp_sk(sk)->snd_una; + } else { + sk->sk_tskey = 0; + } + } + sk->sk_tsflags = val; + if (val & SOF_TIMESTAMPING_RX_SOFTWARE) + sock_enable_timestamp(sk, + SOCK_TIMESTAMPING_RX_SOFTWARE); + else + sock_disable_timestamp(sk, + (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); + break; + + case SO_RCVLOWAT: + if (val < 0) + val = INT_MAX; + sk->sk_rcvlowat = val ? : 1; + break; + + case SO_RCVTIMEO: + ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); + break; + + case SO_SNDTIMEO: + ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); + break; + + case SO_ATTACH_FILTER: + ret = -EINVAL; + if (optlen == sizeof(struct sock_fprog)) { + struct sock_fprog fprog; + + ret = -EFAULT; + if (copy_from_user(&fprog, optval, sizeof(fprog))) + break; + + ret = sk_attach_filter(&fprog, sk); + } + break; + + case SO_ATTACH_BPF: + ret = -EINVAL; + if (optlen == sizeof(u32)) { + u32 ufd; + + ret = -EFAULT; + if (copy_from_user(&ufd, optval, sizeof(ufd))) + break; + + ret = sk_attach_bpf(ufd, sk); + } + break; + + case SO_DETACH_FILTER: + ret = sk_detach_filter(sk); + break; + + case SO_LOCK_FILTER: + if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool) + ret = -EPERM; + else + sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool); + break; + + case SO_PASSSEC: + if (valbool) + set_bit(SOCK_PASSSEC, &sock->flags); + else + clear_bit(SOCK_PASSSEC, &sock->flags); + break; + case SO_MARK: + if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) + ret = -EPERM; + else + sk->sk_mark = val; + break; + + case SO_RXQ_OVFL: + sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); + break; + + case SO_WIFI_STATUS: + sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); + break; + + case SO_PEEK_OFF: + if (sock->ops->set_peek_off) + ret = sock->ops->set_peek_off(sk, val); + else + ret = -EOPNOTSUPP; + break; + + case SO_NOFCS: + sock_valbool_flag(sk, SOCK_NOFCS, valbool); + break; + + case SO_SELECT_ERR_QUEUE: + sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool); + break; + +#ifdef CONFIG_NET_RX_BUSY_POLL + case SO_BUSY_POLL: + /* allow unprivileged users to decrease the value */ + if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN)) + ret = -EPERM; + else { + if (val < 0) + ret = -EINVAL; + else + sk->sk_ll_usec = val; + } + break; +#endif + + case SO_MAX_PACING_RATE: + sk->sk_max_pacing_rate = val; + sk->sk_pacing_rate = min(sk->sk_pacing_rate, + sk->sk_max_pacing_rate); + break; + + default: + ret = -ENOPROTOOPT; + break; + } + release_sock(sk); + return ret; +} +EXPORT_SYMBOL(sock_setsockopt); + + +static void cred_to_ucred(struct pid *pid, const struct cred *cred, + struct ucred *ucred) +{ + ucred->pid = pid_vnr(pid); + ucred->uid = ucred->gid = -1; + if (cred) { + struct user_namespace *current_ns = current_user_ns(); + + ucred->uid = from_kuid_munged(current_ns, cred->euid); + ucred->gid = from_kgid_munged(current_ns, cred->egid); + } +} + +int sock_getsockopt(struct socket *sock, int level, int optname, + char __user *optval, int __user *optlen) +{ + struct sock *sk = sock->sk; + + union { + int val; + struct linger ling; + struct timeval tm; + } v; + + int lv = sizeof(int); + int len; + + if (get_user(len, optlen)) + return -EFAULT; + if (len < 0) + return -EINVAL; + + memset(&v, 0, sizeof(v)); + + switch (optname) { + case SO_DEBUG: + v.val = sock_flag(sk, SOCK_DBG); + break; + + case SO_DONTROUTE: + v.val = sock_flag(sk, SOCK_LOCALROUTE); + break; + + case SO_BROADCAST: + v.val = sock_flag(sk, SOCK_BROADCAST); + break; + + case SO_SNDBUF: + v.val = sk->sk_sndbuf; + break; + + case SO_RCVBUF: + v.val = sk->sk_rcvbuf; + break; + + case SO_REUSEADDR: + v.val = sk->sk_reuse; + break; + + case SO_REUSEPORT: + v.val = sk->sk_reuseport; + break; + + case SO_KEEPALIVE: + v.val = sock_flag(sk, SOCK_KEEPOPEN); + break; + + case SO_TYPE: + v.val = sk->sk_type; + break; + + case SO_PROTOCOL: + v.val = sk->sk_protocol; + break; + + case SO_DOMAIN: + v.val = sk->sk_family; + break; + + case SO_ERROR: + v.val = -sock_error(sk); + if (v.val == 0) + v.val = xchg(&sk->sk_err_soft, 0); + break; + + case SO_OOBINLINE: + v.val = sock_flag(sk, SOCK_URGINLINE); + break; + + case SO_NO_CHECK: + v.val = sk->sk_no_check_tx; + break; + + case SO_PRIORITY: + v.val = sk->sk_priority; + break; + + case SO_LINGER: + lv = sizeof(v.ling); + v.ling.l_onoff = sock_flag(sk, SOCK_LINGER); + v.ling.l_linger = sk->sk_lingertime / HZ; + break; + + case SO_BSDCOMPAT: + sock_warn_obsolete_bsdism("getsockopt"); + break; + + case SO_TIMESTAMP: + v.val = sock_flag(sk, SOCK_RCVTSTAMP) && + !sock_flag(sk, SOCK_RCVTSTAMPNS); + break; + + case SO_TIMESTAMPNS: + v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); + break; + + case SO_TIMESTAMPING: + v.val = sk->sk_tsflags; + break; + + case SO_RCVTIMEO: + lv = sizeof(struct timeval); + if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { + v.tm.tv_sec = 0; + v.tm.tv_usec = 0; + } else { + v.tm.tv_sec = sk->sk_rcvtimeo / HZ; + v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; + } + break; + + case SO_SNDTIMEO: + lv = sizeof(struct timeval); + if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { + v.tm.tv_sec = 0; + v.tm.tv_usec = 0; + } else { + v.tm.tv_sec = sk->sk_sndtimeo / HZ; + v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; + } + break; + + case SO_RCVLOWAT: + v.val = sk->sk_rcvlowat; + break; + + case SO_SNDLOWAT: + v.val = 1; + break; + + case SO_PASSCRED: + v.val = !!test_bit(SOCK_PASSCRED, &sock->flags); + break; + + case SO_PEERCRED: + { + struct ucred peercred; + if (len > sizeof(peercred)) + len = sizeof(peercred); + cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); + if (copy_to_user(optval, &peercred, len)) + return -EFAULT; + goto lenout; + } + + case SO_PEERNAME: + { + char address[128]; + + if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) + return -ENOTCONN; + if (lv < len) + return -EINVAL; + if (copy_to_user(optval, address, len)) + return -EFAULT; + goto lenout; + } + + /* Dubious BSD thing... Probably nobody even uses it, but + * the UNIX standard wants it for whatever reason... -DaveM + */ + case SO_ACCEPTCONN: + v.val = sk->sk_state == TCP_LISTEN; + break; + + case SO_PASSSEC: + v.val = !!test_bit(SOCK_PASSSEC, &sock->flags); + break; + + case SO_PEERSEC: + return security_socket_getpeersec_stream(sock, optval, optlen, len); + + case SO_MARK: + v.val = sk->sk_mark; + break; + + case SO_RXQ_OVFL: + v.val = sock_flag(sk, SOCK_RXQ_OVFL); + break; + + case SO_WIFI_STATUS: + v.val = sock_flag(sk, SOCK_WIFI_STATUS); + break; + + case SO_PEEK_OFF: + if (!sock->ops->set_peek_off) + return -EOPNOTSUPP; + + v.val = sk->sk_peek_off; + break; + case SO_NOFCS: + v.val = sock_flag(sk, SOCK_NOFCS); + break; + + case SO_BINDTODEVICE: + return sock_getbindtodevice(sk, optval, optlen, len); + + case SO_GET_FILTER: + len = sk_get_filter(sk, (struct sock_filter __user *)optval, len); + if (len < 0) + return len; + + goto lenout; + + case SO_LOCK_FILTER: + v.val = sock_flag(sk, SOCK_FILTER_LOCKED); + break; + + case SO_BPF_EXTENSIONS: + v.val = bpf_tell_extensions(); + break; + + case SO_SELECT_ERR_QUEUE: + v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE); + break; + +#ifdef CONFIG_NET_RX_BUSY_POLL + case SO_BUSY_POLL: + v.val = sk->sk_ll_usec; + break; +#endif + + case SO_MAX_PACING_RATE: + v.val = sk->sk_max_pacing_rate; + break; + + case SO_INCOMING_CPU: + v.val = sk->sk_incoming_cpu; + break; + + default: + /* We implement the SO_SNDLOWAT etc to not be settable + * (1003.1g 7). + */ + return -ENOPROTOOPT; + } + + if (len > lv) + len = lv; + if (copy_to_user(optval, &v, len)) + return -EFAULT; +lenout: + if (put_user(len, optlen)) + return -EFAULT; + return 0; +} + +/* + * Initialize an sk_lock. + * + * (We also register the sk_lock with the lock validator.) + */ +static inline void sock_lock_init(struct sock *sk) +{ + sock_lock_init_class_and_name(sk, + af_family_slock_key_strings[sk->sk_family], + af_family_slock_keys + sk->sk_family, + af_family_key_strings[sk->sk_family], + af_family_keys + sk->sk_family); +} + +/* + * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, + * even temporarly, because of RCU lookups. sk_node should also be left as is. + * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end + */ +static void sock_copy(struct sock *nsk, const struct sock *osk) +{ +#ifdef CONFIG_SECURITY_NETWORK + void *sptr = nsk->sk_security; +#endif + memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); + + memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, + osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); + +#ifdef CONFIG_SECURITY_NETWORK + nsk->sk_security = sptr; + security_sk_clone(osk, nsk); +#endif +} + +void sk_prot_clear_portaddr_nulls(struct sock *sk, int size) +{ + unsigned long nulls1, nulls2; + + nulls1 = offsetof(struct sock, __sk_common.skc_node.next); + nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next); + if (nulls1 > nulls2) + swap(nulls1, nulls2); + + if (nulls1 != 0) + memset((char *)sk, 0, nulls1); + memset((char *)sk + nulls1 + sizeof(void *), 0, + nulls2 - nulls1 - sizeof(void *)); + memset((char *)sk + nulls2 + sizeof(void *), 0, + size - nulls2 - sizeof(void *)); +} +EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls); + +static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, + int family) +{ + struct sock *sk; + struct kmem_cache *slab; + + slab = prot->slab; + if (slab != NULL) { + sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); + if (!sk) + return sk; + if (priority & __GFP_ZERO) { + if (prot->clear_sk) + prot->clear_sk(sk, prot->obj_size); + else + sk_prot_clear_nulls(sk, prot->obj_size); + } + } else + sk = kmalloc(prot->obj_size, priority); + + if (sk != NULL) { + kmemcheck_annotate_bitfield(sk, flags); + + if (security_sk_alloc(sk, family, priority)) + goto out_free; + + if (!try_module_get(prot->owner)) + goto out_free_sec; + sk_tx_queue_clear(sk); + } + + return sk; + +out_free_sec: + security_sk_free(sk); +out_free: + if (slab != NULL) + kmem_cache_free(slab, sk); + else + kfree(sk); + return NULL; +} + +static void sk_prot_free(struct proto *prot, struct sock *sk) +{ + struct kmem_cache *slab; + struct module *owner; + + owner = prot->owner; + slab = prot->slab; + + security_sk_free(sk); + if (slab != NULL) + kmem_cache_free(slab, sk); + else + kfree(sk); + module_put(owner); +} + +#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO) +void sock_update_netprioidx(struct sock *sk) +{ + if (in_interrupt()) + return; + + sk->sk_cgrp_prioidx = task_netprioidx(current); +} +EXPORT_SYMBOL_GPL(sock_update_netprioidx); +#endif + +/** + * sk_alloc - All socket objects are allocated here + * @net: the applicable net namespace + * @family: protocol family + * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) + * @prot: struct proto associated with this new sock instance + */ +struct sock *sk_alloc(struct net *net, int family, gfp_t priority, + struct proto *prot) +{ + struct sock *sk; + + sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); + if (sk) { + sk->sk_family = family; + /* + * See comment in struct sock definition to understand + * why we need sk_prot_creator -acme + */ + sk->sk_prot = sk->sk_prot_creator = prot; + sock_lock_init(sk); + sock_net_set(sk, get_net(net)); + atomic_set(&sk->sk_wmem_alloc, 1); + + sock_update_classid(sk); + sock_update_netprioidx(sk); + } + + return sk; +} +EXPORT_SYMBOL(sk_alloc); + +static void __sk_free(struct sock *sk) +{ + struct sk_filter *filter; + + if (sk->sk_destruct) + sk->sk_destruct(sk); + + filter = rcu_dereference_check(sk->sk_filter, + atomic_read(&sk->sk_wmem_alloc) == 0); + if (filter) { + sk_filter_uncharge(sk, filter); + RCU_INIT_POINTER(sk->sk_filter, NULL); + } + + sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP); + + if (atomic_read(&sk->sk_omem_alloc)) + pr_debug("%s: optmem leakage (%d bytes) detected\n", + __func__, atomic_read(&sk->sk_omem_alloc)); + + if (sk->sk_peer_cred) + put_cred(sk->sk_peer_cred); + put_pid(sk->sk_peer_pid); + put_net(sock_net(sk)); + sk_prot_free(sk->sk_prot_creator, sk); +} + +void sk_free(struct sock *sk) +{ + /* + * We subtract one from sk_wmem_alloc and can know if + * some packets are still in some tx queue. + * If not null, sock_wfree() will call __sk_free(sk) later + */ + if (atomic_dec_and_test(&sk->sk_wmem_alloc)) + __sk_free(sk); +} +EXPORT_SYMBOL(sk_free); + +/* + * Last sock_put should drop reference to sk->sk_net. It has already + * been dropped in sk_change_net. Taking reference to stopping namespace + * is not an option. + * Take reference to a socket to remove it from hash _alive_ and after that + * destroy it in the context of init_net. + */ +void sk_release_kernel(struct sock *sk) +{ + if (sk == NULL || sk->sk_socket == NULL) + return; + + sock_hold(sk); + sock_release(sk->sk_socket); + sock_net_set(sk, get_net(&init_net)); + sock_put(sk); +} +EXPORT_SYMBOL(sk_release_kernel); + +static void sk_update_clone(const struct sock *sk, struct sock *newsk) +{ + if (mem_cgroup_sockets_enabled && sk->sk_cgrp) + sock_update_memcg(newsk); +} + +/** + * sk_clone_lock - clone a socket, and lock its clone + * @sk: the socket to clone + * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) + * + * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) + */ +struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority) +{ + struct sock *newsk; + bool is_charged = true; + + newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); + if (newsk != NULL) { + struct sk_filter *filter; + + sock_copy(newsk, sk); + + /* SANITY */ + get_net(sock_net(newsk)); + sk_node_init(&newsk->sk_node); + sock_lock_init(newsk); + bh_lock_sock(newsk); + newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; + newsk->sk_backlog.len = 0; + + atomic_set(&newsk->sk_rmem_alloc, 0); + /* + * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) + */ + atomic_set(&newsk->sk_wmem_alloc, 1); + atomic_set(&newsk->sk_omem_alloc, 0); + skb_queue_head_init(&newsk->sk_receive_queue); + skb_queue_head_init(&newsk->sk_write_queue); + + spin_lock_init(&newsk->sk_dst_lock); + rwlock_init(&newsk->sk_callback_lock); + lockdep_set_class_and_name(&newsk->sk_callback_lock, + af_callback_keys + newsk->sk_family, + af_family_clock_key_strings[newsk->sk_family]); + + newsk->sk_dst_cache = NULL; + newsk->sk_wmem_queued = 0; + newsk->sk_forward_alloc = 0; + newsk->sk_send_head = NULL; + newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; + + sock_reset_flag(newsk, SOCK_DONE); + skb_queue_head_init(&newsk->sk_error_queue); + + filter = rcu_dereference_protected(newsk->sk_filter, 1); + if (filter != NULL) + /* though it's an empty new sock, the charging may fail + * if sysctl_optmem_max was changed between creation of + * original socket and cloning + */ + is_charged = sk_filter_charge(newsk, filter); + + if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk))) { + /* It is still raw copy of parent, so invalidate + * destructor and make plain sk_free() */ + newsk->sk_destruct = NULL; + bh_unlock_sock(newsk); + sk_free(newsk); + newsk = NULL; + goto out; + } + + newsk->sk_err = 0; + newsk->sk_priority = 0; + newsk->sk_incoming_cpu = raw_smp_processor_id(); + atomic64_set(&newsk->sk_cookie, 0); + /* + * Before updating sk_refcnt, we must commit prior changes to memory + * (Documentation/RCU/rculist_nulls.txt for details) + */ + smp_wmb(); + atomic_set(&newsk->sk_refcnt, 2); + + /* + * Increment the counter in the same struct proto as the master + * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that + * is the same as sk->sk_prot->socks, as this field was copied + * with memcpy). + * + * This _changes_ the previous behaviour, where + * tcp_create_openreq_child always was incrementing the + * equivalent to tcp_prot->socks (inet_sock_nr), so this have + * to be taken into account in all callers. -acme + */ + sk_refcnt_debug_inc(newsk); + sk_set_socket(newsk, NULL); + newsk->sk_wq = NULL; + + sk_update_clone(sk, newsk); + + if (newsk->sk_prot->sockets_allocated) + sk_sockets_allocated_inc(newsk); + + if (newsk->sk_flags & SK_FLAGS_TIMESTAMP) + net_enable_timestamp(); + } +out: + return newsk; +} +EXPORT_SYMBOL_GPL(sk_clone_lock); + +void sk_setup_caps(struct sock *sk, struct dst_entry *dst) +{ + __sk_dst_set(sk, dst); + sk->sk_route_caps = dst->dev->features; + if (sk->sk_route_caps & NETIF_F_GSO) + sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; + sk->sk_route_caps &= ~sk->sk_route_nocaps; + if (sk_can_gso(sk)) { + if (dst->header_len) { + sk->sk_route_caps &= ~NETIF_F_GSO_MASK; + } else { + sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; + sk->sk_gso_max_size = dst->dev->gso_max_size; + sk->sk_gso_max_segs = dst->dev->gso_max_segs; + } + } +} +EXPORT_SYMBOL_GPL(sk_setup_caps); + +/* + * Simple resource managers for sockets. + */ + + +/* + * Write buffer destructor automatically called from kfree_skb. + */ +void sock_wfree(struct sk_buff *skb) +{ + struct sock *sk = skb->sk; + unsigned int len = skb->truesize; + + if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { + /* + * Keep a reference on sk_wmem_alloc, this will be released + * after sk_write_space() call + */ + atomic_sub(len - 1, &sk->sk_wmem_alloc); + sk->sk_write_space(sk); + len = 1; + } + /* + * if sk_wmem_alloc reaches 0, we must finish what sk_free() + * could not do because of in-flight packets + */ + if (atomic_sub_and_test(len, &sk->sk_wmem_alloc)) + __sk_free(sk); +} +EXPORT_SYMBOL(sock_wfree); + +void skb_orphan_partial(struct sk_buff *skb) +{ + /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc, + * so we do not completely orphan skb, but transfert all + * accounted bytes but one, to avoid unexpected reorders. + */ + if (skb->destructor == sock_wfree +#ifdef CONFIG_INET + || skb->destructor == tcp_wfree +#endif + ) { + atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc); + skb->truesize = 1; + } else { + skb_orphan(skb); + } +} +EXPORT_SYMBOL(skb_orphan_partial); + +/* + * Read buffer destructor automatically called from kfree_skb. + */ +void sock_rfree(struct sk_buff *skb) +{ + struct sock *sk = skb->sk; + unsigned int len = skb->truesize; + + atomic_sub(len, &sk->sk_rmem_alloc); + sk_mem_uncharge(sk, len); +} +EXPORT_SYMBOL(sock_rfree); + +/* + * Buffer destructor for skbs that are not used directly in read or write + * path, e.g. for error handler skbs. Automatically called from kfree_skb. + */ +void sock_efree(struct sk_buff *skb) +{ + sock_put(skb->sk); +} +EXPORT_SYMBOL(sock_efree); + +kuid_t sock_i_uid(struct sock *sk) +{ + kuid_t uid; + + read_lock_bh(&sk->sk_callback_lock); + uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID; + read_unlock_bh(&sk->sk_callback_lock); + return uid; +} +EXPORT_SYMBOL(sock_i_uid); + +unsigned long sock_i_ino(struct sock *sk) +{ + unsigned long ino; + + read_lock_bh(&sk->sk_callback_lock); + ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; + read_unlock_bh(&sk->sk_callback_lock); + return ino; +} +EXPORT_SYMBOL(sock_i_ino); + +/* + * Allocate a skb from the socket's send buffer. + */ +struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, + gfp_t priority) +{ + if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { + struct sk_buff *skb = alloc_skb(size, priority); + if (skb) { + skb_set_owner_w(skb, sk); + return skb; + } + } + return NULL; +} +EXPORT_SYMBOL(sock_wmalloc); + +/* + * Allocate a memory block from the socket's option memory buffer. + */ +void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) +{ + if ((unsigned int)size <= sysctl_optmem_max && + atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { + void *mem; + /* First do the add, to avoid the race if kmalloc + * might sleep. + */ + atomic_add(size, &sk->sk_omem_alloc); + mem = kmalloc(size, priority); + if (mem) + return mem; + atomic_sub(size, &sk->sk_omem_alloc); + } + return NULL; +} +EXPORT_SYMBOL(sock_kmalloc); + +/* Free an option memory block. Note, we actually want the inline + * here as this allows gcc to detect the nullify and fold away the + * condition entirely. + */ +static inline void __sock_kfree_s(struct sock *sk, void *mem, int size, + const bool nullify) +{ + if (WARN_ON_ONCE(!mem)) + return; + if (nullify) + kzfree(mem); + else + kfree(mem); + atomic_sub(size, &sk->sk_omem_alloc); +} + +void sock_kfree_s(struct sock *sk, void *mem, int size) +{ + __sock_kfree_s(sk, mem, size, false); +} +EXPORT_SYMBOL(sock_kfree_s); + +void sock_kzfree_s(struct sock *sk, void *mem, int size) +{ + __sock_kfree_s(sk, mem, size, true); +} +EXPORT_SYMBOL(sock_kzfree_s); + +/* It is almost wait_for_tcp_memory minus release_sock/lock_sock. + I think, these locks should be removed for datagram sockets. + */ +static long sock_wait_for_wmem(struct sock *sk, long timeo) +{ + DEFINE_WAIT(wait); + + clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); + for (;;) { + if (!timeo) + break; + if (signal_pending(current)) + break; + set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); + prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); + if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) + break; + if (sk->sk_shutdown & SEND_SHUTDOWN) + break; + if (sk->sk_err) + break; + timeo = schedule_timeout(timeo); + } + finish_wait(sk_sleep(sk), &wait); + return timeo; +} + + +/* + * Generic send/receive buffer handlers + */ + +struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, + unsigned long data_len, int noblock, + int *errcode, int max_page_order) +{ + struct sk_buff *skb; + long timeo; + int err; + + timeo = sock_sndtimeo(sk, noblock); + for (;;) { + err = sock_error(sk); + if (err != 0) + goto failure; + + err = -EPIPE; + if (sk->sk_shutdown & SEND_SHUTDOWN) + goto failure; + + if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf) + break; + + set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); + set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); + err = -EAGAIN; + if (!timeo) + goto failure; + if (signal_pending(current)) + goto interrupted; + timeo = sock_wait_for_wmem(sk, timeo); + } + skb = alloc_skb_with_frags(header_len, data_len, max_page_order, + errcode, sk->sk_allocation); + if (skb) + skb_set_owner_w(skb, sk); + return skb; + +interrupted: + err = sock_intr_errno(timeo); +failure: + *errcode = err; + return NULL; +} +EXPORT_SYMBOL(sock_alloc_send_pskb); + +struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, + int noblock, int *errcode) +{ + return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0); +} +EXPORT_SYMBOL(sock_alloc_send_skb); + +/* On 32bit arches, an skb frag is limited to 2^15 */ +#define SKB_FRAG_PAGE_ORDER get_order(32768) + +/** + * skb_page_frag_refill - check that a page_frag contains enough room + * @sz: minimum size of the fragment we want to get + * @pfrag: pointer to page_frag + * @gfp: priority for memory allocation + * + * Note: While this allocator tries to use high order pages, there is + * no guarantee that allocations succeed. Therefore, @sz MUST be + * less or equal than PAGE_SIZE. + */ +bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp) +{ + if (pfrag->page) { + if (atomic_read(&pfrag->page->_count) == 1) { + pfrag->offset = 0; + return true; + } + if (pfrag->offset + sz <= pfrag->size) + return true; + put_page(pfrag->page); + } + + pfrag->offset = 0; + if (SKB_FRAG_PAGE_ORDER) { + pfrag->page = alloc_pages((gfp & ~__GFP_WAIT) | __GFP_COMP | + __GFP_NOWARN | __GFP_NORETRY, + SKB_FRAG_PAGE_ORDER); + if (likely(pfrag->page)) { + pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER; + return true; + } + } + pfrag->page = alloc_page(gfp); + if (likely(pfrag->page)) { + pfrag->size = PAGE_SIZE; + return true; + } + return false; +} +EXPORT_SYMBOL(skb_page_frag_refill); + +bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) +{ + if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation))) + return true; + + sk_enter_memory_pressure(sk); + sk_stream_moderate_sndbuf(sk); + return false; +} +EXPORT_SYMBOL(sk_page_frag_refill); + +static void __lock_sock(struct sock *sk) + __releases(&sk->sk_lock.slock) + __acquires(&sk->sk_lock.slock) +{ + DEFINE_WAIT(wait); + + for (;;) { + prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, + TASK_UNINTERRUPTIBLE); + spin_unlock_bh(&sk->sk_lock.slock); + schedule(); + spin_lock_bh(&sk->sk_lock.slock); + if (!sock_owned_by_user(sk)) + break; + } + finish_wait(&sk->sk_lock.wq, &wait); +} + +static void __release_sock(struct sock *sk) + __releases(&sk->sk_lock.slock) + __acquires(&sk->sk_lock.slock) +{ + struct sk_buff *skb = sk->sk_backlog.head; + + do { + sk->sk_backlog.head = sk->sk_backlog.tail = NULL; + bh_unlock_sock(sk); + + do { + struct sk_buff *next = skb->next; + + prefetch(next); + WARN_ON_ONCE(skb_dst_is_noref(skb)); + skb->next = NULL; + sk_backlog_rcv(sk, skb); + + /* + * We are in process context here with softirqs + * disabled, use cond_resched_softirq() to preempt. + * This is safe to do because we've taken the backlog + * queue private: + */ + cond_resched_softirq(); + + skb = next; + } while (skb != NULL); + + bh_lock_sock(sk); + } while ((skb = sk->sk_backlog.head) != NULL); + + /* + * Doing the zeroing here guarantee we can not loop forever + * while a wild producer attempts to flood us. + */ + sk->sk_backlog.len = 0; +} + +/** + * sk_wait_data - wait for data to arrive at sk_receive_queue + * @sk: sock to wait on + * @timeo: for how long + * + * Now socket state including sk->sk_err is changed only under lock, + * hence we may omit checks after joining wait queue. + * We check receive queue before schedule() only as optimization; + * it is very likely that release_sock() added new data. + */ +int sk_wait_data(struct sock *sk, long *timeo) +{ + int rc; + DEFINE_WAIT(wait); + + prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); + set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); + rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); + clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); + finish_wait(sk_sleep(sk), &wait); + return rc; +} +EXPORT_SYMBOL(sk_wait_data); + +/** + * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated + * @sk: socket + * @size: memory size to allocate + * @kind: allocation type + * + * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means + * rmem allocation. This function assumes that protocols which have + * memory_pressure use sk_wmem_queued as write buffer accounting. + */ +int __sk_mem_schedule(struct sock *sk, int size, int kind) +{ + struct proto *prot = sk->sk_prot; + int amt = sk_mem_pages(size); + long allocated; + int parent_status = UNDER_LIMIT; + + sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; + + allocated = sk_memory_allocated_add(sk, amt, &parent_status); + + /* Under limit. */ + if (parent_status == UNDER_LIMIT && + allocated <= sk_prot_mem_limits(sk, 0)) { + sk_leave_memory_pressure(sk); + return 1; + } + + /* Under pressure. (we or our parents) */ + if ((parent_status > SOFT_LIMIT) || + allocated > sk_prot_mem_limits(sk, 1)) + sk_enter_memory_pressure(sk); + + /* Over hard limit (we or our parents) */ + if ((parent_status == OVER_LIMIT) || + (allocated > sk_prot_mem_limits(sk, 2))) + goto suppress_allocation; + + /* guarantee minimum buffer size under pressure */ + if (kind == SK_MEM_RECV) { + if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) + return 1; + + } else { /* SK_MEM_SEND */ + if (sk->sk_type == SOCK_STREAM) { + if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) + return 1; + } else if (atomic_read(&sk->sk_wmem_alloc) < + prot->sysctl_wmem[0]) + return 1; + } + + if (sk_has_memory_pressure(sk)) { + int alloc; + + if (!sk_under_memory_pressure(sk)) + return 1; + alloc = sk_sockets_allocated_read_positive(sk); + if (sk_prot_mem_limits(sk, 2) > alloc * + sk_mem_pages(sk->sk_wmem_queued + + atomic_read(&sk->sk_rmem_alloc) + + sk->sk_forward_alloc)) + return 1; + } + +suppress_allocation: + + if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { + sk_stream_moderate_sndbuf(sk); + + /* Fail only if socket is _under_ its sndbuf. + * In this case we cannot block, so that we have to fail. + */ + if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) + return 1; + } + + trace_sock_exceed_buf_limit(sk, prot, allocated); + + /* Alas. Undo changes. */ + sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; + + sk_memory_allocated_sub(sk, amt); + + return 0; +} +EXPORT_SYMBOL(__sk_mem_schedule); + +/** + * __sk_reclaim - reclaim memory_allocated + * @sk: socket + */ +void __sk_mem_reclaim(struct sock *sk) +{ + sk_memory_allocated_sub(sk, + sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT); + sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; + + if (sk_under_memory_pressure(sk) && + (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) + sk_leave_memory_pressure(sk); +} +EXPORT_SYMBOL(__sk_mem_reclaim); + + +/* + * Set of default routines for initialising struct proto_ops when + * the protocol does not support a particular function. In certain + * cases where it makes no sense for a protocol to have a "do nothing" + * function, some default processing is provided. + */ + +int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) +{ + return -EOPNOTSUPP; +} +EXPORT_SYMBOL(sock_no_bind); + +int sock_no_connect(struct socket *sock, struct sockaddr *saddr, + int len, int flags) +{ + return -EOPNOTSUPP; +} +EXPORT_SYMBOL(sock_no_connect); + +int sock_no_socketpair(struct socket *sock1, struct socket *sock2) +{ + return -EOPNOTSUPP; +} +EXPORT_SYMBOL(sock_no_socketpair); + +int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) +{ + return -EOPNOTSUPP; +} +EXPORT_SYMBOL(sock_no_accept); + +int sock_no_getname(struct socket *sock, struct sockaddr *saddr, + int *len, int peer) +{ + return -EOPNOTSUPP; +} +EXPORT_SYMBOL(sock_no_getname); + +unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) +{ + return 0; +} +EXPORT_SYMBOL(sock_no_poll); + +int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) +{ + return -EOPNOTSUPP; +} +EXPORT_SYMBOL(sock_no_ioctl); + +int sock_no_listen(struct socket *sock, int backlog) +{ + return -EOPNOTSUPP; +} +EXPORT_SYMBOL(sock_no_listen); + +int sock_no_shutdown(struct socket *sock, int how) +{ + return -EOPNOTSUPP; +} +EXPORT_SYMBOL(sock_no_shutdown); + +int sock_no_setsockopt(struct socket *sock, int level, int optname, + char __user *optval, unsigned int optlen) +{ + return -EOPNOTSUPP; +} +EXPORT_SYMBOL(sock_no_setsockopt); + +int sock_no_getsockopt(struct socket *sock, int level, int optname, + char __user *optval, int __user *optlen) +{ + return -EOPNOTSUPP; +} +EXPORT_SYMBOL(sock_no_getsockopt); + +int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len) +{ + return -EOPNOTSUPP; +} +EXPORT_SYMBOL(sock_no_sendmsg); + +int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len, + int flags) +{ + return -EOPNOTSUPP; +} +EXPORT_SYMBOL(sock_no_recvmsg); + +int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) +{ + /* Mirror missing mmap method error code */ + return -ENODEV; +} +EXPORT_SYMBOL(sock_no_mmap); + +ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) +{ + ssize_t res; + struct msghdr msg = {.msg_flags = flags}; + struct kvec iov; + char *kaddr = kmap(page); + iov.iov_base = kaddr + offset; + iov.iov_len = size; + res = kernel_sendmsg(sock, &msg, &iov, 1, size); + kunmap(page); + return res; +} +EXPORT_SYMBOL(sock_no_sendpage); + +/* + * Default Socket Callbacks + */ + +static void sock_def_wakeup(struct sock *sk) +{ + struct socket_wq *wq; + + rcu_read_lock(); + wq = rcu_dereference(sk->sk_wq); + if (wq_has_sleeper(wq)) + wake_up_interruptible_all(&wq->wait); + rcu_read_unlock(); +} + +static void sock_def_error_report(struct sock *sk) +{ + struct socket_wq *wq; + + rcu_read_lock(); + wq = rcu_dereference(sk->sk_wq); + if (wq_has_sleeper(wq)) + wake_up_interruptible_poll(&wq->wait, POLLERR); + sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); + rcu_read_unlock(); +} + +static void sock_def_readable(struct sock *sk) +{ + struct socket_wq *wq; + + rcu_read_lock(); + wq = rcu_dereference(sk->sk_wq); + if (wq_has_sleeper(wq)) + wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI | + POLLRDNORM | POLLRDBAND); + sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); + rcu_read_unlock(); +} + +static void sock_def_write_space(struct sock *sk) +{ + struct socket_wq *wq; + + rcu_read_lock(); + + /* Do not wake up a writer until he can make "significant" + * progress. --DaveM + */ + if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { + wq = rcu_dereference(sk->sk_wq); + if (wq_has_sleeper(wq)) + wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | + POLLWRNORM | POLLWRBAND); + + /* Should agree with poll, otherwise some programs break */ + if (sock_writeable(sk)) + sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); + } + + rcu_read_unlock(); +} + +static void sock_def_destruct(struct sock *sk) +{ + kfree(sk->sk_protinfo); +} + +void sk_send_sigurg(struct sock *sk) +{ + if (sk->sk_socket && sk->sk_socket->file) + if (send_sigurg(&sk->sk_socket->file->f_owner)) + sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); +} +EXPORT_SYMBOL(sk_send_sigurg); + +void sk_reset_timer(struct sock *sk, struct timer_list* timer, + unsigned long expires) +{ + if (!mod_timer(timer, expires)) + sock_hold(sk); +} +EXPORT_SYMBOL(sk_reset_timer); + +void sk_stop_timer(struct sock *sk, struct timer_list* timer) +{ + if (del_timer(timer)) + __sock_put(sk); +} +EXPORT_SYMBOL(sk_stop_timer); + +void sock_init_data(struct socket *sock, struct sock *sk) +{ + skb_queue_head_init(&sk->sk_receive_queue); + skb_queue_head_init(&sk->sk_write_queue); + skb_queue_head_init(&sk->sk_error_queue); + + sk->sk_send_head = NULL; + + init_timer(&sk->sk_timer); + + sk->sk_allocation = GFP_KERNEL; + sk->sk_rcvbuf = sysctl_rmem_default; + sk->sk_sndbuf = sysctl_wmem_default; + sk->sk_state = TCP_CLOSE; + sk_set_socket(sk, sock); + + sock_set_flag(sk, SOCK_ZAPPED); + + if (sock) { + sk->sk_type = sock->type; + sk->sk_wq = sock->wq; + sock->sk = sk; + } else + sk->sk_wq = NULL; + + spin_lock_init(&sk->sk_dst_lock); + rwlock_init(&sk->sk_callback_lock); + lockdep_set_class_and_name(&sk->sk_callback_lock, + af_callback_keys + sk->sk_family, + af_family_clock_key_strings[sk->sk_family]); + + sk->sk_state_change = sock_def_wakeup; + sk->sk_data_ready = sock_def_readable; + sk->sk_write_space = sock_def_write_space; + sk->sk_error_report = sock_def_error_report; + sk->sk_destruct = sock_def_destruct; + + sk->sk_frag.page = NULL; + sk->sk_frag.offset = 0; + sk->sk_peek_off = -1; + + sk->sk_peer_pid = NULL; + sk->sk_peer_cred = NULL; + sk->sk_write_pending = 0; + sk->sk_rcvlowat = 1; + sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; + sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; + + sk->sk_stamp = ktime_set(-1L, 0); + +#ifdef CONFIG_NET_RX_BUSY_POLL + sk->sk_napi_id = 0; + sk->sk_ll_usec = sysctl_net_busy_read; +#endif + + sk->sk_max_pacing_rate = ~0U; + sk->sk_pacing_rate = ~0U; + /* + * Before updating sk_refcnt, we must commit prior changes to memory + * (Documentation/RCU/rculist_nulls.txt for details) + */ + smp_wmb(); + atomic_set(&sk->sk_refcnt, 1); + atomic_set(&sk->sk_drops, 0); +} +EXPORT_SYMBOL(sock_init_data); + +void lock_sock_nested(struct sock *sk, int subclass) +{ + might_sleep(); + spin_lock_bh(&sk->sk_lock.slock); + if (sk->sk_lock.owned) + __lock_sock(sk); + sk->sk_lock.owned = 1; + spin_unlock_bh(&sk->sk_lock.slock); + /* + * The sk_lock has mutex_lock() semantics here: + */ + mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); +} +EXPORT_SYMBOL(lock_sock_nested); + +void release_sock(struct sock *sk) +{ + /* + * The sk_lock has mutex_unlock() semantics: + */ + mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); + + spin_lock_bh(&sk->sk_lock.slock); + if (sk->sk_backlog.tail) + __release_sock(sk); + + /* Warning : release_cb() might need to release sk ownership, + * ie call sock_release_ownership(sk) before us. + */ + if (sk->sk_prot->release_cb) + sk->sk_prot->release_cb(sk); + + sock_release_ownership(sk); + if (waitqueue_active(&sk->sk_lock.wq)) + wake_up(&sk->sk_lock.wq); + spin_unlock_bh(&sk->sk_lock.slock); +} +EXPORT_SYMBOL(release_sock); + +/** + * lock_sock_fast - fast version of lock_sock + * @sk: socket + * + * This version should be used for very small section, where process wont block + * return false if fast path is taken + * sk_lock.slock locked, owned = 0, BH disabled + * return true if slow path is taken + * sk_lock.slock unlocked, owned = 1, BH enabled + */ +bool lock_sock_fast(struct sock *sk) +{ + might_sleep(); + spin_lock_bh(&sk->sk_lock.slock); + + if (!sk->sk_lock.owned) + /* + * Note : We must disable BH + */ + return false; + + __lock_sock(sk); + sk->sk_lock.owned = 1; + spin_unlock(&sk->sk_lock.slock); + /* + * The sk_lock has mutex_lock() semantics here: + */ + mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); + local_bh_enable(); + return true; +} +EXPORT_SYMBOL(lock_sock_fast); + +int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) +{ + struct timeval tv; + if (!sock_flag(sk, SOCK_TIMESTAMP)) + sock_enable_timestamp(sk, SOCK_TIMESTAMP); + tv = ktime_to_timeval(sk->sk_stamp); + if (tv.tv_sec == -1) + return -ENOENT; + if (tv.tv_sec == 0) { + sk->sk_stamp = ktime_get_real(); + tv = ktime_to_timeval(sk->sk_stamp); + } + return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; +} +EXPORT_SYMBOL(sock_get_timestamp); + +int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) +{ + struct timespec ts; + if (!sock_flag(sk, SOCK_TIMESTAMP)) + sock_enable_timestamp(sk, SOCK_TIMESTAMP); + ts = ktime_to_timespec(sk->sk_stamp); + if (ts.tv_sec == -1) + return -ENOENT; + if (ts.tv_sec == 0) { + sk->sk_stamp = ktime_get_real(); + ts = ktime_to_timespec(sk->sk_stamp); + } + return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; +} +EXPORT_SYMBOL(sock_get_timestampns); + +void sock_enable_timestamp(struct sock *sk, int flag) +{ + if (!sock_flag(sk, flag)) { + unsigned long previous_flags = sk->sk_flags; + + sock_set_flag(sk, flag); + /* + * we just set one of the two flags which require net + * time stamping, but time stamping might have been on + * already because of the other one + */ + if (!(previous_flags & SK_FLAGS_TIMESTAMP)) + net_enable_timestamp(); + } +} + +int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, + int level, int type) +{ + struct sock_exterr_skb *serr; + struct sk_buff *skb; + int copied, err; + + err = -EAGAIN; + skb = sock_dequeue_err_skb(sk); + if (skb == NULL) + goto out; + + copied = skb->len; + if (copied > len) { + msg->msg_flags |= MSG_TRUNC; + copied = len; + } + err = skb_copy_datagram_msg(skb, 0, msg, copied); + if (err) + goto out_free_skb; + + sock_recv_timestamp(msg, sk, skb); + + serr = SKB_EXT_ERR(skb); + put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee); + + msg->msg_flags |= MSG_ERRQUEUE; + err = copied; + +out_free_skb: + kfree_skb(skb); +out: + return err; +} +EXPORT_SYMBOL(sock_recv_errqueue); + +/* + * Get a socket option on an socket. + * + * FIX: POSIX 1003.1g is very ambiguous here. It states that + * asynchronous errors should be reported by getsockopt. We assume + * this means if you specify SO_ERROR (otherwise whats the point of it). + */ +int sock_common_getsockopt(struct socket *sock, int level, int optname, + char __user *optval, int __user *optlen) +{ + struct sock *sk = sock->sk; + + return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); +} +EXPORT_SYMBOL(sock_common_getsockopt); + +#ifdef CONFIG_COMPAT +int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, + char __user *optval, int __user *optlen) +{ + struct sock *sk = sock->sk; + + if (sk->sk_prot->compat_getsockopt != NULL) + return sk->sk_prot->compat_getsockopt(sk, level, optname, + optval, optlen); + return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); +} +EXPORT_SYMBOL(compat_sock_common_getsockopt); +#endif + +int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, + int flags) +{ + struct sock *sk = sock->sk; + int addr_len = 0; + int err; + + err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, + flags & ~MSG_DONTWAIT, &addr_len); + if (err >= 0) + msg->msg_namelen = addr_len; + return err; +} +EXPORT_SYMBOL(sock_common_recvmsg); + +/* + * Set socket options on an inet socket. + */ +int sock_common_setsockopt(struct socket *sock, int level, int optname, + char __user *optval, unsigned int optlen) +{ + struct sock *sk = sock->sk; + + return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); +} +EXPORT_SYMBOL(sock_common_setsockopt); + +#ifdef CONFIG_COMPAT +int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, + char __user *optval, unsigned int optlen) +{ + struct sock *sk = sock->sk; + + if (sk->sk_prot->compat_setsockopt != NULL) + return sk->sk_prot->compat_setsockopt(sk, level, optname, + optval, optlen); + return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); +} +EXPORT_SYMBOL(compat_sock_common_setsockopt); +#endif + +void sk_common_release(struct sock *sk) +{ + if (sk->sk_prot->destroy) + sk->sk_prot->destroy(sk); + + /* + * Observation: when sock_common_release is called, processes have + * no access to socket. But net still has. + * Step one, detach it from networking: + * + * A. Remove from hash tables. + */ + + sk->sk_prot->unhash(sk); + + /* + * In this point socket cannot receive new packets, but it is possible + * that some packets are in flight because some CPU runs receiver and + * did hash table lookup before we unhashed socket. They will achieve + * receive queue and will be purged by socket destructor. + * + * Also we still have packets pending on receive queue and probably, + * our own packets waiting in device queues. sock_destroy will drain + * receive queue, but transmitted packets will delay socket destruction + * until the last reference will be released. + */ + + sock_orphan(sk); + + xfrm_sk_free_policy(sk); + + sk_refcnt_debug_release(sk); + + if (sk->sk_frag.page) { + put_page(sk->sk_frag.page); + sk->sk_frag.page = NULL; + } + + sock_put(sk); +} +EXPORT_SYMBOL(sk_common_release); + +#ifdef CONFIG_PROC_FS +#define PROTO_INUSE_NR 64 /* should be enough for the first time */ +struct prot_inuse { + int val[PROTO_INUSE_NR]; +}; + +static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); + +#ifdef CONFIG_NET_NS +void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) +{ + __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val); +} +EXPORT_SYMBOL_GPL(sock_prot_inuse_add); + +int sock_prot_inuse_get(struct net *net, struct proto *prot) +{ + int cpu, idx = prot->inuse_idx; + int res = 0; + + for_each_possible_cpu(cpu) + res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; + + return res >= 0 ? res : 0; +} +EXPORT_SYMBOL_GPL(sock_prot_inuse_get); + +static int __net_init sock_inuse_init_net(struct net *net) +{ + net->core.inuse = alloc_percpu(struct prot_inuse); + return net->core.inuse ? 0 : -ENOMEM; +} + +static void __net_exit sock_inuse_exit_net(struct net *net) +{ + free_percpu(net->core.inuse); +} + +static struct pernet_operations net_inuse_ops = { + .init = sock_inuse_init_net, + .exit = sock_inuse_exit_net, +}; + +static __init int net_inuse_init(void) +{ + if (register_pernet_subsys(&net_inuse_ops)) + panic("Cannot initialize net inuse counters"); + + return 0; +} + +core_initcall(net_inuse_init); +#else +static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); + +void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) +{ + __this_cpu_add(prot_inuse.val[prot->inuse_idx], val); +} +EXPORT_SYMBOL_GPL(sock_prot_inuse_add); + +int sock_prot_inuse_get(struct net *net, struct proto *prot) +{ + int cpu, idx = prot->inuse_idx; + int res = 0; + + for_each_possible_cpu(cpu) + res += per_cpu(prot_inuse, cpu).val[idx]; + + return res >= 0 ? res : 0; +} +EXPORT_SYMBOL_GPL(sock_prot_inuse_get); +#endif + +static void assign_proto_idx(struct proto *prot) +{ + prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); + + if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { + pr_err("PROTO_INUSE_NR exhausted\n"); + return; + } + + set_bit(prot->inuse_idx, proto_inuse_idx); +} + +static void release_proto_idx(struct proto *prot) +{ + if (prot->inuse_idx != PROTO_INUSE_NR - 1) + clear_bit(prot->inuse_idx, proto_inuse_idx); +} +#else +static inline void assign_proto_idx(struct proto *prot) +{ +} + +static inline void release_proto_idx(struct proto *prot) +{ +} +#endif + +static void req_prot_cleanup(struct request_sock_ops *rsk_prot) +{ + if (!rsk_prot) + return; + kfree(rsk_prot->slab_name); + rsk_prot->slab_name = NULL; + if (rsk_prot->slab) { + kmem_cache_destroy(rsk_prot->slab); + rsk_prot->slab = NULL; + } +} + +static int req_prot_init(const struct proto *prot) +{ + struct request_sock_ops *rsk_prot = prot->rsk_prot; + + if (!rsk_prot) + return 0; + + rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", + prot->name); + if (!rsk_prot->slab_name) + return -ENOMEM; + + rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name, + rsk_prot->obj_size, 0, + 0, NULL); + + if (!rsk_prot->slab) { + pr_crit("%s: Can't create request sock SLAB cache!\n", + prot->name); + return -ENOMEM; + } + return 0; +} + +int proto_register(struct proto *prot, int alloc_slab) +{ + if (alloc_slab) { + prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, + SLAB_HWCACHE_ALIGN | prot->slab_flags, + NULL); + + if (prot->slab == NULL) { + pr_crit("%s: Can't create sock SLAB cache!\n", + prot->name); + goto out; + } + + if (req_prot_init(prot)) + goto out_free_request_sock_slab; + + if (prot->twsk_prot != NULL) { + prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); + + if (prot->twsk_prot->twsk_slab_name == NULL) + goto out_free_request_sock_slab; + + prot->twsk_prot->twsk_slab = + kmem_cache_create(prot->twsk_prot->twsk_slab_name, + prot->twsk_prot->twsk_obj_size, + 0, + prot->slab_flags, + NULL); + if (prot->twsk_prot->twsk_slab == NULL) + goto out_free_timewait_sock_slab_name; + } + } + + mutex_lock(&proto_list_mutex); + list_add(&prot->node, &proto_list); + assign_proto_idx(prot); + mutex_unlock(&proto_list_mutex); + return 0; + +out_free_timewait_sock_slab_name: + kfree(prot->twsk_prot->twsk_slab_name); +out_free_request_sock_slab: + req_prot_cleanup(prot->rsk_prot); + + kmem_cache_destroy(prot->slab); + prot->slab = NULL; +out: + return -ENOBUFS; +} +EXPORT_SYMBOL(proto_register); + +void proto_unregister(struct proto *prot) +{ + mutex_lock(&proto_list_mutex); + release_proto_idx(prot); + list_del(&prot->node); + mutex_unlock(&proto_list_mutex); + + if (prot->slab != NULL) { + kmem_cache_destroy(prot->slab); + prot->slab = NULL; + } + + req_prot_cleanup(prot->rsk_prot); + + if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { + kmem_cache_destroy(prot->twsk_prot->twsk_slab); + kfree(prot->twsk_prot->twsk_slab_name); + prot->twsk_prot->twsk_slab = NULL; + } +} +EXPORT_SYMBOL(proto_unregister); + +#ifdef CONFIG_PROC_FS +static void *proto_seq_start(struct seq_file *seq, loff_t *pos) + __acquires(proto_list_mutex) +{ + mutex_lock(&proto_list_mutex); + return seq_list_start_head(&proto_list, *pos); +} + +static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + return seq_list_next(v, &proto_list, pos); +} + +static void proto_seq_stop(struct seq_file *seq, void *v) + __releases(proto_list_mutex) +{ + mutex_unlock(&proto_list_mutex); +} + +static char proto_method_implemented(const void *method) +{ + return method == NULL ? 'n' : 'y'; +} +static long sock_prot_memory_allocated(struct proto *proto) +{ + return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L; +} + +static char *sock_prot_memory_pressure(struct proto *proto) +{ + return proto->memory_pressure != NULL ? + proto_memory_pressure(proto) ? "yes" : "no" : "NI"; +} + +static void proto_seq_printf(struct seq_file *seq, struct proto *proto) +{ + + seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " + "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", + proto->name, + proto->obj_size, + sock_prot_inuse_get(seq_file_net(seq), proto), + sock_prot_memory_allocated(proto), + sock_prot_memory_pressure(proto), + proto->max_header, + proto->slab == NULL ? "no" : "yes", + module_name(proto->owner), + proto_method_implemented(proto->close), + proto_method_implemented(proto->connect), + proto_method_implemented(proto->disconnect), + proto_method_implemented(proto->accept), + proto_method_implemented(proto->ioctl), + proto_method_implemented(proto->init), + proto_method_implemented(proto->destroy), + proto_method_implemented(proto->shutdown), + proto_method_implemented(proto->setsockopt), + proto_method_implemented(proto->getsockopt), + proto_method_implemented(proto->sendmsg), + proto_method_implemented(proto->recvmsg), + proto_method_implemented(proto->sendpage), + proto_method_implemented(proto->bind), + proto_method_implemented(proto->backlog_rcv), + proto_method_implemented(proto->hash), + proto_method_implemented(proto->unhash), + proto_method_implemented(proto->get_port), + proto_method_implemented(proto->enter_memory_pressure)); +} + +static int proto_seq_show(struct seq_file *seq, void *v) +{ + if (v == &proto_list) + seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", + "protocol", + "size", + "sockets", + "memory", + "press", + "maxhdr", + "slab", + "module", + "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); + else + proto_seq_printf(seq, list_entry(v, struct proto, node)); + return 0; +} + +static const struct seq_operations proto_seq_ops = { + .start = proto_seq_start, + .next = proto_seq_next, + .stop = proto_seq_stop, + .show = proto_seq_show, +}; + +static int proto_seq_open(struct inode *inode, struct file *file) +{ + return seq_open_net(inode, file, &proto_seq_ops, + sizeof(struct seq_net_private)); +} + +static const struct file_operations proto_seq_fops = { + .owner = THIS_MODULE, + .open = proto_seq_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release_net, +}; + +static __net_init int proto_init_net(struct net *net) +{ + if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops)) + return -ENOMEM; + + return 0; +} + +static __net_exit void proto_exit_net(struct net *net) +{ + remove_proc_entry("protocols", net->proc_net); +} + + +static __net_initdata struct pernet_operations proto_net_ops = { + .init = proto_init_net, + .exit = proto_exit_net, +}; + +static int __init proto_init(void) +{ + return register_pernet_subsys(&proto_net_ops); +} + +subsys_initcall(proto_init); + +#endif /* PROC_FS */ |