2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
35 * code. The ACK stuff can wait and needs major
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
92 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
94 #include <linux/capability.h>
95 #include <linux/errno.h>
96 #include <linux/errqueue.h>
97 #include <linux/types.h>
98 #include <linux/socket.h>
100 #include <linux/kernel.h>
101 #include <linux/module.h>
102 #include <linux/proc_fs.h>
103 #include <linux/seq_file.h>
104 #include <linux/sched.h>
105 #include <linux/timer.h>
106 #include <linux/string.h>
107 #include <linux/sockios.h>
108 #include <linux/net.h>
109 #include <linux/mm.h>
110 #include <linux/slab.h>
111 #include <linux/interrupt.h>
112 #include <linux/poll.h>
113 #include <linux/tcp.h>
114 #include <linux/init.h>
115 #include <linux/highmem.h>
116 #include <linux/user_namespace.h>
117 #include <linux/static_key.h>
118 #include <linux/memcontrol.h>
119 #include <linux/prefetch.h>
121 #include <asm/uaccess.h>
123 #include <linux/netdevice.h>
124 #include <net/protocol.h>
125 #include <linux/skbuff.h>
126 #include <net/net_namespace.h>
127 #include <net/request_sock.h>
128 #include <net/sock.h>
129 #include <linux/net_tstamp.h>
130 #include <net/xfrm.h>
131 #include <linux/ipsec.h>
132 #include <net/cls_cgroup.h>
133 #include <net/netprio_cgroup.h>
135 #include <linux/filter.h>
137 #include <trace/events/sock.h>
143 #include <net/busy_poll.h>
145 static DEFINE_MUTEX(proto_list_mutex);
146 static LIST_HEAD(proto_list);
148 #ifdef CONFIG_MEMCG_KMEM
149 int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
154 mutex_lock(&proto_list_mutex);
155 list_for_each_entry(proto, &proto_list, node) {
156 if (proto->init_cgroup) {
157 ret = proto->init_cgroup(memcg, ss);
163 mutex_unlock(&proto_list_mutex);
166 list_for_each_entry_continue_reverse(proto, &proto_list, node)
167 if (proto->destroy_cgroup)
168 proto->destroy_cgroup(memcg);
169 mutex_unlock(&proto_list_mutex);
173 void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
177 mutex_lock(&proto_list_mutex);
178 list_for_each_entry_reverse(proto, &proto_list, node)
179 if (proto->destroy_cgroup)
180 proto->destroy_cgroup(memcg);
181 mutex_unlock(&proto_list_mutex);
186 * Each address family might have different locking rules, so we have
187 * one slock key per address family:
189 static struct lock_class_key af_family_keys[AF_MAX];
190 static struct lock_class_key af_family_slock_keys[AF_MAX];
192 #if defined(CONFIG_MEMCG_KMEM)
193 struct static_key memcg_socket_limit_enabled;
194 EXPORT_SYMBOL(memcg_socket_limit_enabled);
198 * Make lock validator output more readable. (we pre-construct these
199 * strings build-time, so that runtime initialization of socket
202 static const char *const af_family_key_strings[AF_MAX+1] = {
203 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
204 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
205 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
206 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
207 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
208 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
209 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
210 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
211 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
212 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
213 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
214 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
215 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
216 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX"
218 static const char *const af_family_slock_key_strings[AF_MAX+1] = {
219 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
220 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
221 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
222 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
223 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
224 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
225 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
226 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
227 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
228 "slock-27" , "slock-28" , "slock-AF_CAN" ,
229 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
230 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
231 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
232 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX"
234 static const char *const af_family_clock_key_strings[AF_MAX+1] = {
235 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
236 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
237 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
238 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
239 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
240 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
241 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
242 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
243 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
244 "clock-27" , "clock-28" , "clock-AF_CAN" ,
245 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
246 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
247 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
248 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX"
252 * sk_callback_lock locking rules are per-address-family,
253 * so split the lock classes by using a per-AF key:
255 static struct lock_class_key af_callback_keys[AF_MAX];
257 /* Take into consideration the size of the struct sk_buff overhead in the
258 * determination of these values, since that is non-constant across
259 * platforms. This makes socket queueing behavior and performance
260 * not depend upon such differences.
262 #define _SK_MEM_PACKETS 256
263 #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
264 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
265 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
267 /* Run time adjustable parameters. */
268 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
269 EXPORT_SYMBOL(sysctl_wmem_max);
270 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
271 EXPORT_SYMBOL(sysctl_rmem_max);
272 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
273 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
275 /* Maximal space eaten by iovec or ancillary data plus some space */
276 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
277 EXPORT_SYMBOL(sysctl_optmem_max);
279 struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
280 EXPORT_SYMBOL_GPL(memalloc_socks);
283 * sk_set_memalloc - sets %SOCK_MEMALLOC
284 * @sk: socket to set it on
286 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
287 * It's the responsibility of the admin to adjust min_free_kbytes
288 * to meet the requirements
290 void sk_set_memalloc(struct sock *sk)
292 sock_set_flag(sk, SOCK_MEMALLOC);
293 sk->sk_allocation |= __GFP_MEMALLOC;
294 static_key_slow_inc(&memalloc_socks);
296 EXPORT_SYMBOL_GPL(sk_set_memalloc);
298 void sk_clear_memalloc(struct sock *sk)
300 sock_reset_flag(sk, SOCK_MEMALLOC);
301 sk->sk_allocation &= ~__GFP_MEMALLOC;
302 static_key_slow_dec(&memalloc_socks);
305 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
306 * progress of swapping. However, if SOCK_MEMALLOC is cleared while
307 * it has rmem allocations there is a risk that the user of the
308 * socket cannot make forward progress due to exceeding the rmem
309 * limits. By rights, sk_clear_memalloc() should only be called
310 * on sockets being torn down but warn and reset the accounting if
311 * that assumption breaks.
313 if (WARN_ON(sk->sk_forward_alloc))
316 EXPORT_SYMBOL_GPL(sk_clear_memalloc);
318 int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
321 unsigned long pflags = current->flags;
323 /* these should have been dropped before queueing */
324 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
326 current->flags |= PF_MEMALLOC;
327 ret = sk->sk_backlog_rcv(sk, skb);
328 tsk_restore_flags(current, pflags, PF_MEMALLOC);
332 EXPORT_SYMBOL(__sk_backlog_rcv);
334 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
338 if (optlen < sizeof(tv))
340 if (copy_from_user(&tv, optval, sizeof(tv)))
342 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
346 static int warned __read_mostly;
349 if (warned < 10 && net_ratelimit()) {
351 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
352 __func__, current->comm, task_pid_nr(current));
356 *timeo_p = MAX_SCHEDULE_TIMEOUT;
357 if (tv.tv_sec == 0 && tv.tv_usec == 0)
359 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
360 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
364 static void sock_warn_obsolete_bsdism(const char *name)
367 static char warncomm[TASK_COMM_LEN];
368 if (strcmp(warncomm, current->comm) && warned < 5) {
369 strcpy(warncomm, current->comm);
370 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
376 #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
378 static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
380 if (sk->sk_flags & flags) {
381 sk->sk_flags &= ~flags;
382 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
383 net_disable_timestamp();
388 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
393 struct sk_buff_head *list = &sk->sk_receive_queue;
395 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
396 atomic_inc(&sk->sk_drops);
397 trace_sock_rcvqueue_full(sk, skb);
401 err = sk_filter(sk, skb);
405 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
406 atomic_inc(&sk->sk_drops);
411 skb_set_owner_r(skb, sk);
413 /* Cache the SKB length before we tack it onto the receive
414 * queue. Once it is added it no longer belongs to us and
415 * may be freed by other threads of control pulling packets
420 /* we escape from rcu protected region, make sure we dont leak
425 spin_lock_irqsave(&list->lock, flags);
426 skb->dropcount = atomic_read(&sk->sk_drops);
427 __skb_queue_tail(list, skb);
428 spin_unlock_irqrestore(&list->lock, flags);
430 if (!sock_flag(sk, SOCK_DEAD))
431 sk->sk_data_ready(sk, skb_len);
434 EXPORT_SYMBOL(sock_queue_rcv_skb);
436 int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
438 int rc = NET_RX_SUCCESS;
440 if (sk_filter(sk, skb))
441 goto discard_and_relse;
445 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) {
446 atomic_inc(&sk->sk_drops);
447 goto discard_and_relse;
450 bh_lock_sock_nested(sk);
453 if (!sock_owned_by_user(sk)) {
455 * trylock + unlock semantics:
457 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
459 rc = sk_backlog_rcv(sk, skb);
461 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
462 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
464 atomic_inc(&sk->sk_drops);
465 goto discard_and_relse;
476 EXPORT_SYMBOL(sk_receive_skb);
478 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
480 struct dst_entry *dst = __sk_dst_get(sk);
482 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
483 sk_tx_queue_clear(sk);
484 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
491 EXPORT_SYMBOL(__sk_dst_check);
493 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
495 struct dst_entry *dst = sk_dst_get(sk);
497 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
505 EXPORT_SYMBOL(sk_dst_check);
507 static int sock_setbindtodevice(struct sock *sk, char __user *optval,
510 int ret = -ENOPROTOOPT;
511 #ifdef CONFIG_NETDEVICES
512 struct net *net = sock_net(sk);
513 char devname[IFNAMSIZ];
518 if (!ns_capable(net->user_ns, CAP_NET_RAW))
525 /* Bind this socket to a particular device like "eth0",
526 * as specified in the passed interface name. If the
527 * name is "" or the option length is zero the socket
530 if (optlen > IFNAMSIZ - 1)
531 optlen = IFNAMSIZ - 1;
532 memset(devname, 0, sizeof(devname));
535 if (copy_from_user(devname, optval, optlen))
539 if (devname[0] != '\0') {
540 struct net_device *dev;
543 dev = dev_get_by_name_rcu(net, devname);
545 index = dev->ifindex;
553 sk->sk_bound_dev_if = index;
565 static int sock_getbindtodevice(struct sock *sk, char __user *optval,
566 int __user *optlen, int len)
568 int ret = -ENOPROTOOPT;
569 #ifdef CONFIG_NETDEVICES
570 struct net *net = sock_net(sk);
571 char devname[IFNAMSIZ];
573 if (sk->sk_bound_dev_if == 0) {
582 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
586 len = strlen(devname) + 1;
589 if (copy_to_user(optval, devname, len))
594 if (put_user(len, optlen))
605 static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
608 sock_set_flag(sk, bit);
610 sock_reset_flag(sk, bit);
614 * This is meant for all protocols to use and covers goings on
615 * at the socket level. Everything here is generic.
618 int sock_setsockopt(struct socket *sock, int level, int optname,
619 char __user *optval, unsigned int optlen)
621 struct sock *sk = sock->sk;
628 * Options without arguments
631 if (optname == SO_BINDTODEVICE)
632 return sock_setbindtodevice(sk, optval, optlen);
634 if (optlen < sizeof(int))
637 if (get_user(val, (int __user *)optval))
640 valbool = val ? 1 : 0;
646 if (val && !capable(CAP_NET_ADMIN))
649 sock_valbool_flag(sk, SOCK_DBG, valbool);
652 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
655 sk->sk_reuseport = valbool;
664 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
667 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
670 /* Don't error on this BSD doesn't and if you think
671 * about it this is right. Otherwise apps have to
672 * play 'guess the biggest size' games. RCVBUF/SNDBUF
673 * are treated in BSD as hints
675 val = min_t(u32, val, sysctl_wmem_max);
677 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
678 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
679 /* Wake up sending tasks if we upped the value. */
680 sk->sk_write_space(sk);
684 if (!capable(CAP_NET_ADMIN)) {
691 /* Don't error on this BSD doesn't and if you think
692 * about it this is right. Otherwise apps have to
693 * play 'guess the biggest size' games. RCVBUF/SNDBUF
694 * are treated in BSD as hints
696 val = min_t(u32, val, sysctl_rmem_max);
698 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
700 * We double it on the way in to account for
701 * "struct sk_buff" etc. overhead. Applications
702 * assume that the SO_RCVBUF setting they make will
703 * allow that much actual data to be received on that
706 * Applications are unaware that "struct sk_buff" and
707 * other overheads allocate from the receive buffer
708 * during socket buffer allocation.
710 * And after considering the possible alternatives,
711 * returning the value we actually used in getsockopt
712 * is the most desirable behavior.
714 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
718 if (!capable(CAP_NET_ADMIN)) {
726 if (sk->sk_protocol == IPPROTO_TCP &&
727 sk->sk_type == SOCK_STREAM)
728 tcp_set_keepalive(sk, valbool);
730 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
734 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
738 sk->sk_no_check = valbool;
742 if ((val >= 0 && val <= 6) ||
743 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
744 sk->sk_priority = val;
750 if (optlen < sizeof(ling)) {
751 ret = -EINVAL; /* 1003.1g */
754 if (copy_from_user(&ling, optval, sizeof(ling))) {
759 sock_reset_flag(sk, SOCK_LINGER);
761 #if (BITS_PER_LONG == 32)
762 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
763 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
766 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
767 sock_set_flag(sk, SOCK_LINGER);
772 sock_warn_obsolete_bsdism("setsockopt");
777 set_bit(SOCK_PASSCRED, &sock->flags);
779 clear_bit(SOCK_PASSCRED, &sock->flags);
785 if (optname == SO_TIMESTAMP)
786 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
788 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
789 sock_set_flag(sk, SOCK_RCVTSTAMP);
790 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
792 sock_reset_flag(sk, SOCK_RCVTSTAMP);
793 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
797 case SO_TIMESTAMPING:
798 if (val & ~SOF_TIMESTAMPING_MASK) {
802 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
803 val & SOF_TIMESTAMPING_TX_HARDWARE);
804 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
805 val & SOF_TIMESTAMPING_TX_SOFTWARE);
806 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
807 val & SOF_TIMESTAMPING_RX_HARDWARE);
808 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
809 sock_enable_timestamp(sk,
810 SOCK_TIMESTAMPING_RX_SOFTWARE);
812 sock_disable_timestamp(sk,
813 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
814 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
815 val & SOF_TIMESTAMPING_SOFTWARE);
816 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
817 val & SOF_TIMESTAMPING_SYS_HARDWARE);
818 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
819 val & SOF_TIMESTAMPING_RAW_HARDWARE);
825 sk->sk_rcvlowat = val ? : 1;
829 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
833 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
836 case SO_ATTACH_FILTER:
838 if (optlen == sizeof(struct sock_fprog)) {
839 struct sock_fprog fprog;
842 if (copy_from_user(&fprog, optval, sizeof(fprog)))
845 ret = sk_attach_filter(&fprog, sk);
849 case SO_DETACH_FILTER:
850 ret = sk_detach_filter(sk);
854 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
857 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
862 set_bit(SOCK_PASSSEC, &sock->flags);
864 clear_bit(SOCK_PASSSEC, &sock->flags);
867 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
873 /* We implement the SO_SNDLOWAT etc to
874 not be settable (1003.1g 5.3) */
876 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
880 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
884 if (sock->ops->set_peek_off)
885 ret = sock->ops->set_peek_off(sk, val);
891 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
894 case SO_SELECT_ERR_QUEUE:
895 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
898 #ifdef CONFIG_NET_RX_BUSY_POLL
900 /* allow unprivileged users to decrease the value */
901 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
907 sk->sk_ll_usec = val;
912 case SO_MAX_PACING_RATE:
913 sk->sk_max_pacing_rate = val;
914 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
915 sk->sk_max_pacing_rate);
925 EXPORT_SYMBOL(sock_setsockopt);
928 void cred_to_ucred(struct pid *pid, const struct cred *cred,
931 ucred->pid = pid_vnr(pid);
932 ucred->uid = ucred->gid = -1;
934 struct user_namespace *current_ns = current_user_ns();
936 ucred->uid = from_kuid_munged(current_ns, cred->euid);
937 ucred->gid = from_kgid_munged(current_ns, cred->egid);
940 EXPORT_SYMBOL_GPL(cred_to_ucred);
942 int sock_getsockopt(struct socket *sock, int level, int optname,
943 char __user *optval, int __user *optlen)
945 struct sock *sk = sock->sk;
953 int lv = sizeof(int);
956 if (get_user(len, optlen))
961 memset(&v, 0, sizeof(v));
965 v.val = sock_flag(sk, SOCK_DBG);
969 v.val = sock_flag(sk, SOCK_LOCALROUTE);
973 v.val = sock_flag(sk, SOCK_BROADCAST);
977 v.val = sk->sk_sndbuf;
981 v.val = sk->sk_rcvbuf;
985 v.val = sk->sk_reuse;
989 v.val = sk->sk_reuseport;
993 v.val = sock_flag(sk, SOCK_KEEPOPEN);
1001 v.val = sk->sk_protocol;
1005 v.val = sk->sk_family;
1009 v.val = -sock_error(sk);
1011 v.val = xchg(&sk->sk_err_soft, 0);
1015 v.val = sock_flag(sk, SOCK_URGINLINE);
1019 v.val = sk->sk_no_check;
1023 v.val = sk->sk_priority;
1027 lv = sizeof(v.ling);
1028 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
1029 v.ling.l_linger = sk->sk_lingertime / HZ;
1033 sock_warn_obsolete_bsdism("getsockopt");
1037 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1038 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1041 case SO_TIMESTAMPNS:
1042 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
1045 case SO_TIMESTAMPING:
1047 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
1048 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
1049 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
1050 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
1051 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
1052 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
1053 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1054 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
1055 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
1056 v.val |= SOF_TIMESTAMPING_SOFTWARE;
1057 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
1058 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
1059 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
1060 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
1064 lv = sizeof(struct timeval);
1065 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1069 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1070 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1075 lv = sizeof(struct timeval);
1076 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1080 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1081 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1086 v.val = sk->sk_rcvlowat;
1094 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1099 struct ucred peercred;
1100 if (len > sizeof(peercred))
1101 len = sizeof(peercred);
1102 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1103 if (copy_to_user(optval, &peercred, len))
1112 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1116 if (copy_to_user(optval, address, len))
1121 /* Dubious BSD thing... Probably nobody even uses it, but
1122 * the UNIX standard wants it for whatever reason... -DaveM
1125 v.val = sk->sk_state == TCP_LISTEN;
1129 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1133 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1136 v.val = sk->sk_mark;
1140 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1143 case SO_WIFI_STATUS:
1144 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1148 if (!sock->ops->set_peek_off)
1151 v.val = sk->sk_peek_off;
1154 v.val = sock_flag(sk, SOCK_NOFCS);
1157 case SO_BINDTODEVICE:
1158 return sock_getbindtodevice(sk, optval, optlen, len);
1161 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1167 case SO_LOCK_FILTER:
1168 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1171 case SO_SELECT_ERR_QUEUE:
1172 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1175 #ifdef CONFIG_NET_RX_BUSY_POLL
1177 v.val = sk->sk_ll_usec;
1181 case SO_MAX_PACING_RATE:
1182 v.val = sk->sk_max_pacing_rate;
1186 return -ENOPROTOOPT;
1191 if (copy_to_user(optval, &v, len))
1194 if (put_user(len, optlen))
1200 * Initialize an sk_lock.
1202 * (We also register the sk_lock with the lock validator.)
1204 static inline void sock_lock_init(struct sock *sk)
1206 sock_lock_init_class_and_name(sk,
1207 af_family_slock_key_strings[sk->sk_family],
1208 af_family_slock_keys + sk->sk_family,
1209 af_family_key_strings[sk->sk_family],
1210 af_family_keys + sk->sk_family);
1214 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1215 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1216 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1218 static void sock_copy(struct sock *nsk, const struct sock *osk)
1220 #ifdef CONFIG_SECURITY_NETWORK
1221 void *sptr = nsk->sk_security;
1223 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1225 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1226 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1228 #ifdef CONFIG_SECURITY_NETWORK
1229 nsk->sk_security = sptr;
1230 security_sk_clone(osk, nsk);
1234 void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1236 unsigned long nulls1, nulls2;
1238 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1239 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1240 if (nulls1 > nulls2)
1241 swap(nulls1, nulls2);
1244 memset((char *)sk, 0, nulls1);
1245 memset((char *)sk + nulls1 + sizeof(void *), 0,
1246 nulls2 - nulls1 - sizeof(void *));
1247 memset((char *)sk + nulls2 + sizeof(void *), 0,
1248 size - nulls2 - sizeof(void *));
1250 EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1252 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1256 struct kmem_cache *slab;
1260 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1263 if (priority & __GFP_ZERO) {
1265 prot->clear_sk(sk, prot->obj_size);
1267 sk_prot_clear_nulls(sk, prot->obj_size);
1270 sk = kmalloc(prot->obj_size, priority);
1273 kmemcheck_annotate_bitfield(sk, flags);
1275 if (security_sk_alloc(sk, family, priority))
1278 if (!try_module_get(prot->owner))
1280 sk_tx_queue_clear(sk);
1286 security_sk_free(sk);
1289 kmem_cache_free(slab, sk);
1295 static void sk_prot_free(struct proto *prot, struct sock *sk)
1297 struct kmem_cache *slab;
1298 struct module *owner;
1300 owner = prot->owner;
1303 security_sk_free(sk);
1305 kmem_cache_free(slab, sk);
1311 #if IS_ENABLED(CONFIG_NET_CLS_CGROUP)
1312 void sock_update_classid(struct sock *sk)
1316 classid = task_cls_classid(current);
1317 if (classid != sk->sk_classid)
1318 sk->sk_classid = classid;
1320 EXPORT_SYMBOL(sock_update_classid);
1323 #if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
1324 void sock_update_netprioidx(struct sock *sk)
1329 sk->sk_cgrp_prioidx = task_netprioidx(current);
1331 EXPORT_SYMBOL_GPL(sock_update_netprioidx);
1335 * sk_alloc - All socket objects are allocated here
1336 * @net: the applicable net namespace
1337 * @family: protocol family
1338 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1339 * @prot: struct proto associated with this new sock instance
1341 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1346 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1348 sk->sk_family = family;
1350 * See comment in struct sock definition to understand
1351 * why we need sk_prot_creator -acme
1353 sk->sk_prot = sk->sk_prot_creator = prot;
1355 sock_net_set(sk, get_net(net));
1356 atomic_set(&sk->sk_wmem_alloc, 1);
1358 sock_update_classid(sk);
1359 sock_update_netprioidx(sk);
1364 EXPORT_SYMBOL(sk_alloc);
1366 static void __sk_free(struct sock *sk)
1368 struct sk_filter *filter;
1370 if (sk->sk_destruct)
1371 sk->sk_destruct(sk);
1373 filter = rcu_dereference_check(sk->sk_filter,
1374 atomic_read(&sk->sk_wmem_alloc) == 0);
1376 sk_filter_uncharge(sk, filter);
1377 RCU_INIT_POINTER(sk->sk_filter, NULL);
1380 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1382 if (atomic_read(&sk->sk_omem_alloc))
1383 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1384 __func__, atomic_read(&sk->sk_omem_alloc));
1386 if (sk->sk_peer_cred)
1387 put_cred(sk->sk_peer_cred);
1388 put_pid(sk->sk_peer_pid);
1389 put_net(sock_net(sk));
1390 sk_prot_free(sk->sk_prot_creator, sk);
1393 void sk_free(struct sock *sk)
1396 * We subtract one from sk_wmem_alloc and can know if
1397 * some packets are still in some tx queue.
1398 * If not null, sock_wfree() will call __sk_free(sk) later
1400 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1403 EXPORT_SYMBOL(sk_free);
1406 * Last sock_put should drop reference to sk->sk_net. It has already
1407 * been dropped in sk_change_net. Taking reference to stopping namespace
1409 * Take reference to a socket to remove it from hash _alive_ and after that
1410 * destroy it in the context of init_net.
1412 void sk_release_kernel(struct sock *sk)
1414 if (sk == NULL || sk->sk_socket == NULL)
1418 sock_release(sk->sk_socket);
1419 release_net(sock_net(sk));
1420 sock_net_set(sk, get_net(&init_net));
1423 EXPORT_SYMBOL(sk_release_kernel);
1425 static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1427 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1428 sock_update_memcg(newsk);
1432 * sk_clone_lock - clone a socket, and lock its clone
1433 * @sk: the socket to clone
1434 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1436 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1438 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1442 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1443 if (newsk != NULL) {
1444 struct sk_filter *filter;
1446 sock_copy(newsk, sk);
1449 get_net(sock_net(newsk));
1450 sk_node_init(&newsk->sk_node);
1451 sock_lock_init(newsk);
1452 bh_lock_sock(newsk);
1453 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1454 newsk->sk_backlog.len = 0;
1456 atomic_set(&newsk->sk_rmem_alloc, 0);
1458 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1460 atomic_set(&newsk->sk_wmem_alloc, 1);
1461 atomic_set(&newsk->sk_omem_alloc, 0);
1462 skb_queue_head_init(&newsk->sk_receive_queue);
1463 skb_queue_head_init(&newsk->sk_write_queue);
1464 #ifdef CONFIG_NET_DMA
1465 skb_queue_head_init(&newsk->sk_async_wait_queue);
1468 spin_lock_init(&newsk->sk_dst_lock);
1469 rwlock_init(&newsk->sk_callback_lock);
1470 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1471 af_callback_keys + newsk->sk_family,
1472 af_family_clock_key_strings[newsk->sk_family]);
1474 newsk->sk_dst_cache = NULL;
1475 newsk->sk_wmem_queued = 0;
1476 newsk->sk_forward_alloc = 0;
1477 newsk->sk_send_head = NULL;
1478 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1480 sock_reset_flag(newsk, SOCK_DONE);
1481 skb_queue_head_init(&newsk->sk_error_queue);
1483 filter = rcu_dereference_protected(newsk->sk_filter, 1);
1485 sk_filter_charge(newsk, filter);
1487 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1488 /* It is still raw copy of parent, so invalidate
1489 * destructor and make plain sk_free() */
1490 newsk->sk_destruct = NULL;
1491 bh_unlock_sock(newsk);
1498 newsk->sk_priority = 0;
1500 * Before updating sk_refcnt, we must commit prior changes to memory
1501 * (Documentation/RCU/rculist_nulls.txt for details)
1504 atomic_set(&newsk->sk_refcnt, 2);
1507 * Increment the counter in the same struct proto as the master
1508 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1509 * is the same as sk->sk_prot->socks, as this field was copied
1512 * This _changes_ the previous behaviour, where
1513 * tcp_create_openreq_child always was incrementing the
1514 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1515 * to be taken into account in all callers. -acme
1517 sk_refcnt_debug_inc(newsk);
1518 sk_set_socket(newsk, NULL);
1519 newsk->sk_wq = NULL;
1521 sk_update_clone(sk, newsk);
1523 if (newsk->sk_prot->sockets_allocated)
1524 sk_sockets_allocated_inc(newsk);
1526 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1527 net_enable_timestamp();
1532 EXPORT_SYMBOL_GPL(sk_clone_lock);
1534 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1536 __sk_dst_set(sk, dst);
1537 sk->sk_route_caps = dst->dev->features;
1538 if (sk->sk_route_caps & NETIF_F_GSO)
1539 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1540 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1541 if (sk_can_gso(sk)) {
1542 if (dst->header_len) {
1543 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1545 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1546 sk->sk_gso_max_size = dst->dev->gso_max_size;
1547 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
1551 EXPORT_SYMBOL_GPL(sk_setup_caps);
1554 * Simple resource managers for sockets.
1559 * Write buffer destructor automatically called from kfree_skb.
1561 void sock_wfree(struct sk_buff *skb)
1563 struct sock *sk = skb->sk;
1564 unsigned int len = skb->truesize;
1566 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1568 * Keep a reference on sk_wmem_alloc, this will be released
1569 * after sk_write_space() call
1571 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1572 sk->sk_write_space(sk);
1576 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1577 * could not do because of in-flight packets
1579 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
1582 EXPORT_SYMBOL(sock_wfree);
1584 void skb_orphan_partial(struct sk_buff *skb)
1586 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1587 * so we do not completely orphan skb, but transfert all
1588 * accounted bytes but one, to avoid unexpected reorders.
1590 if (skb->destructor == sock_wfree
1592 || skb->destructor == tcp_wfree
1595 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1601 EXPORT_SYMBOL(skb_orphan_partial);
1604 * Read buffer destructor automatically called from kfree_skb.
1606 void sock_rfree(struct sk_buff *skb)
1608 struct sock *sk = skb->sk;
1609 unsigned int len = skb->truesize;
1611 atomic_sub(len, &sk->sk_rmem_alloc);
1612 sk_mem_uncharge(sk, len);
1614 EXPORT_SYMBOL(sock_rfree);
1616 void sock_edemux(struct sk_buff *skb)
1618 struct sock *sk = skb->sk;
1621 if (sk->sk_state == TCP_TIME_WAIT)
1622 inet_twsk_put(inet_twsk(sk));
1627 EXPORT_SYMBOL(sock_edemux);
1629 kuid_t sock_i_uid(struct sock *sk)
1633 read_lock_bh(&sk->sk_callback_lock);
1634 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
1635 read_unlock_bh(&sk->sk_callback_lock);
1638 EXPORT_SYMBOL(sock_i_uid);
1640 unsigned long sock_i_ino(struct sock *sk)
1644 read_lock_bh(&sk->sk_callback_lock);
1645 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1646 read_unlock_bh(&sk->sk_callback_lock);
1649 EXPORT_SYMBOL(sock_i_ino);
1652 * Allocate a skb from the socket's send buffer.
1654 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1657 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1658 struct sk_buff *skb = alloc_skb(size, priority);
1660 skb_set_owner_w(skb, sk);
1666 EXPORT_SYMBOL(sock_wmalloc);
1669 * Allocate a skb from the socket's receive buffer.
1671 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1674 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1675 struct sk_buff *skb = alloc_skb(size, priority);
1677 skb_set_owner_r(skb, sk);
1685 * Allocate a memory block from the socket's option memory buffer.
1687 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1689 if ((unsigned int)size <= sysctl_optmem_max &&
1690 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1692 /* First do the add, to avoid the race if kmalloc
1695 atomic_add(size, &sk->sk_omem_alloc);
1696 mem = kmalloc(size, priority);
1699 atomic_sub(size, &sk->sk_omem_alloc);
1703 EXPORT_SYMBOL(sock_kmalloc);
1706 * Free an option memory block.
1708 void sock_kfree_s(struct sock *sk, void *mem, int size)
1711 atomic_sub(size, &sk->sk_omem_alloc);
1713 EXPORT_SYMBOL(sock_kfree_s);
1715 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1716 I think, these locks should be removed for datagram sockets.
1718 static long sock_wait_for_wmem(struct sock *sk, long timeo)
1722 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1726 if (signal_pending(current))
1728 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1729 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1730 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1732 if (sk->sk_shutdown & SEND_SHUTDOWN)
1736 timeo = schedule_timeout(timeo);
1738 finish_wait(sk_sleep(sk), &wait);
1744 * Generic send/receive buffer handlers
1747 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1748 unsigned long data_len, int noblock,
1749 int *errcode, int max_page_order)
1751 struct sk_buff *skb = NULL;
1752 unsigned long chunk;
1756 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1761 if (npages > MAX_SKB_FRAGS)
1764 timeo = sock_sndtimeo(sk, noblock);
1766 err = sock_error(sk);
1771 if (sk->sk_shutdown & SEND_SHUTDOWN)
1774 if (atomic_read(&sk->sk_wmem_alloc) >= sk->sk_sndbuf) {
1775 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1776 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1780 if (signal_pending(current))
1782 timeo = sock_wait_for_wmem(sk, timeo);
1787 gfp_mask = sk->sk_allocation;
1788 if (gfp_mask & __GFP_WAIT)
1789 gfp_mask |= __GFP_REPEAT;
1791 skb = alloc_skb(header_len, gfp_mask);
1795 skb->truesize += data_len;
1797 for (i = 0; npages > 0; i++) {
1798 int order = max_page_order;
1801 if (npages >= 1 << order) {
1802 page = alloc_pages(sk->sk_allocation |
1803 __GFP_COMP | __GFP_NOWARN,
1810 page = alloc_page(sk->sk_allocation);
1814 chunk = min_t(unsigned long, data_len,
1815 PAGE_SIZE << order);
1816 skb_fill_page_desc(skb, i, page, 0, chunk);
1818 npages -= 1 << order;
1822 skb_set_owner_w(skb, sk);
1826 err = sock_intr_errno(timeo);
1832 EXPORT_SYMBOL(sock_alloc_send_pskb);
1834 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1835 int noblock, int *errcode)
1837 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1839 EXPORT_SYMBOL(sock_alloc_send_skb);
1841 /* On 32bit arches, an skb frag is limited to 2^15 */
1842 #define SKB_FRAG_PAGE_ORDER get_order(32768)
1845 * skb_page_frag_refill - check that a page_frag contains enough room
1846 * @sz: minimum size of the fragment we want to get
1847 * @pfrag: pointer to page_frag
1848 * @prio: priority for memory allocation
1850 * Note: While this allocator tries to use high order pages, there is
1851 * no guarantee that allocations succeed. Therefore, @sz MUST be
1852 * less or equal than PAGE_SIZE.
1854 bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t prio)
1859 if (atomic_read(&pfrag->page->_count) == 1) {
1863 if (pfrag->offset + sz <= pfrag->size)
1865 put_page(pfrag->page);
1868 /* We restrict high order allocations to users that can afford to wait */
1869 order = (prio & __GFP_WAIT) ? SKB_FRAG_PAGE_ORDER : 0;
1875 gfp |= __GFP_COMP | __GFP_NOWARN;
1876 pfrag->page = alloc_pages(gfp, order);
1877 if (likely(pfrag->page)) {
1879 pfrag->size = PAGE_SIZE << order;
1882 } while (--order >= 0);
1886 EXPORT_SYMBOL(skb_page_frag_refill);
1888 bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1890 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1893 sk_enter_memory_pressure(sk);
1894 sk_stream_moderate_sndbuf(sk);
1897 EXPORT_SYMBOL(sk_page_frag_refill);
1899 static void __lock_sock(struct sock *sk)
1900 __releases(&sk->sk_lock.slock)
1901 __acquires(&sk->sk_lock.slock)
1906 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1907 TASK_UNINTERRUPTIBLE);
1908 spin_unlock_bh(&sk->sk_lock.slock);
1910 spin_lock_bh(&sk->sk_lock.slock);
1911 if (!sock_owned_by_user(sk))
1914 finish_wait(&sk->sk_lock.wq, &wait);
1917 static void __release_sock(struct sock *sk)
1918 __releases(&sk->sk_lock.slock)
1919 __acquires(&sk->sk_lock.slock)
1921 struct sk_buff *skb = sk->sk_backlog.head;
1924 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1928 struct sk_buff *next = skb->next;
1931 WARN_ON_ONCE(skb_dst_is_noref(skb));
1933 sk_backlog_rcv(sk, skb);
1936 * We are in process context here with softirqs
1937 * disabled, use cond_resched_softirq() to preempt.
1938 * This is safe to do because we've taken the backlog
1941 cond_resched_softirq();
1944 } while (skb != NULL);
1947 } while ((skb = sk->sk_backlog.head) != NULL);
1950 * Doing the zeroing here guarantee we can not loop forever
1951 * while a wild producer attempts to flood us.
1953 sk->sk_backlog.len = 0;
1957 * sk_wait_data - wait for data to arrive at sk_receive_queue
1958 * @sk: sock to wait on
1959 * @timeo: for how long
1961 * Now socket state including sk->sk_err is changed only under lock,
1962 * hence we may omit checks after joining wait queue.
1963 * We check receive queue before schedule() only as optimization;
1964 * it is very likely that release_sock() added new data.
1966 int sk_wait_data(struct sock *sk, long *timeo)
1971 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1972 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1973 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1974 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1975 finish_wait(sk_sleep(sk), &wait);
1978 EXPORT_SYMBOL(sk_wait_data);
1981 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1983 * @size: memory size to allocate
1984 * @kind: allocation type
1986 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1987 * rmem allocation. This function assumes that protocols which have
1988 * memory_pressure use sk_wmem_queued as write buffer accounting.
1990 int __sk_mem_schedule(struct sock *sk, int size, int kind)
1992 struct proto *prot = sk->sk_prot;
1993 int amt = sk_mem_pages(size);
1995 int parent_status = UNDER_LIMIT;
1997 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1999 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
2002 if (parent_status == UNDER_LIMIT &&
2003 allocated <= sk_prot_mem_limits(sk, 0)) {
2004 sk_leave_memory_pressure(sk);
2008 /* Under pressure. (we or our parents) */
2009 if ((parent_status > SOFT_LIMIT) ||
2010 allocated > sk_prot_mem_limits(sk, 1))
2011 sk_enter_memory_pressure(sk);
2013 /* Over hard limit (we or our parents) */
2014 if ((parent_status == OVER_LIMIT) ||
2015 (allocated > sk_prot_mem_limits(sk, 2)))
2016 goto suppress_allocation;
2018 /* guarantee minimum buffer size under pressure */
2019 if (kind == SK_MEM_RECV) {
2020 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2023 } else { /* SK_MEM_SEND */
2024 if (sk->sk_type == SOCK_STREAM) {
2025 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2027 } else if (atomic_read(&sk->sk_wmem_alloc) <
2028 prot->sysctl_wmem[0])
2032 if (sk_has_memory_pressure(sk)) {
2035 if (!sk_under_memory_pressure(sk))
2037 alloc = sk_sockets_allocated_read_positive(sk);
2038 if (sk_prot_mem_limits(sk, 2) > alloc *
2039 sk_mem_pages(sk->sk_wmem_queued +
2040 atomic_read(&sk->sk_rmem_alloc) +
2041 sk->sk_forward_alloc))
2045 suppress_allocation:
2047 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2048 sk_stream_moderate_sndbuf(sk);
2050 /* Fail only if socket is _under_ its sndbuf.
2051 * In this case we cannot block, so that we have to fail.
2053 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2057 trace_sock_exceed_buf_limit(sk, prot, allocated);
2059 /* Alas. Undo changes. */
2060 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
2062 sk_memory_allocated_sub(sk, amt);
2066 EXPORT_SYMBOL(__sk_mem_schedule);
2069 * __sk_reclaim - reclaim memory_allocated
2072 void __sk_mem_reclaim(struct sock *sk)
2074 sk_memory_allocated_sub(sk,
2075 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
2076 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
2078 if (sk_under_memory_pressure(sk) &&
2079 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2080 sk_leave_memory_pressure(sk);
2082 EXPORT_SYMBOL(__sk_mem_reclaim);
2086 * Set of default routines for initialising struct proto_ops when
2087 * the protocol does not support a particular function. In certain
2088 * cases where it makes no sense for a protocol to have a "do nothing"
2089 * function, some default processing is provided.
2092 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2096 EXPORT_SYMBOL(sock_no_bind);
2098 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
2103 EXPORT_SYMBOL(sock_no_connect);
2105 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2109 EXPORT_SYMBOL(sock_no_socketpair);
2111 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2115 EXPORT_SYMBOL(sock_no_accept);
2117 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
2122 EXPORT_SYMBOL(sock_no_getname);
2124 unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
2128 EXPORT_SYMBOL(sock_no_poll);
2130 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2134 EXPORT_SYMBOL(sock_no_ioctl);
2136 int sock_no_listen(struct socket *sock, int backlog)
2140 EXPORT_SYMBOL(sock_no_listen);
2142 int sock_no_shutdown(struct socket *sock, int how)
2146 EXPORT_SYMBOL(sock_no_shutdown);
2148 int sock_no_setsockopt(struct socket *sock, int level, int optname,
2149 char __user *optval, unsigned int optlen)
2153 EXPORT_SYMBOL(sock_no_setsockopt);
2155 int sock_no_getsockopt(struct socket *sock, int level, int optname,
2156 char __user *optval, int __user *optlen)
2160 EXPORT_SYMBOL(sock_no_getsockopt);
2162 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2167 EXPORT_SYMBOL(sock_no_sendmsg);
2169 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2170 size_t len, int flags)
2174 EXPORT_SYMBOL(sock_no_recvmsg);
2176 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2178 /* Mirror missing mmap method error code */
2181 EXPORT_SYMBOL(sock_no_mmap);
2183 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2186 struct msghdr msg = {.msg_flags = flags};
2188 char *kaddr = kmap(page);
2189 iov.iov_base = kaddr + offset;
2191 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2195 EXPORT_SYMBOL(sock_no_sendpage);
2198 * Default Socket Callbacks
2201 static void sock_def_wakeup(struct sock *sk)
2203 struct socket_wq *wq;
2206 wq = rcu_dereference(sk->sk_wq);
2207 if (wq_has_sleeper(wq))
2208 wake_up_interruptible_all(&wq->wait);
2212 static void sock_def_error_report(struct sock *sk)
2214 struct socket_wq *wq;
2217 wq = rcu_dereference(sk->sk_wq);
2218 if (wq_has_sleeper(wq))
2219 wake_up_interruptible_poll(&wq->wait, POLLERR);
2220 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2224 static void sock_def_readable(struct sock *sk, int len)
2226 struct socket_wq *wq;
2229 wq = rcu_dereference(sk->sk_wq);
2230 if (wq_has_sleeper(wq))
2231 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
2232 POLLRDNORM | POLLRDBAND);
2233 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2237 static void sock_def_write_space(struct sock *sk)
2239 struct socket_wq *wq;
2243 /* Do not wake up a writer until he can make "significant"
2246 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
2247 wq = rcu_dereference(sk->sk_wq);
2248 if (wq_has_sleeper(wq))
2249 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
2250 POLLWRNORM | POLLWRBAND);
2252 /* Should agree with poll, otherwise some programs break */
2253 if (sock_writeable(sk))
2254 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2260 static void sock_def_destruct(struct sock *sk)
2262 kfree(sk->sk_protinfo);
2265 void sk_send_sigurg(struct sock *sk)
2267 if (sk->sk_socket && sk->sk_socket->file)
2268 if (send_sigurg(&sk->sk_socket->file->f_owner))
2269 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2271 EXPORT_SYMBOL(sk_send_sigurg);
2273 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2274 unsigned long expires)
2276 if (!mod_timer(timer, expires))
2279 EXPORT_SYMBOL(sk_reset_timer);
2281 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2283 if (del_timer(timer))
2286 EXPORT_SYMBOL(sk_stop_timer);
2288 void sock_init_data(struct socket *sock, struct sock *sk)
2290 skb_queue_head_init(&sk->sk_receive_queue);
2291 skb_queue_head_init(&sk->sk_write_queue);
2292 skb_queue_head_init(&sk->sk_error_queue);
2293 #ifdef CONFIG_NET_DMA
2294 skb_queue_head_init(&sk->sk_async_wait_queue);
2297 sk->sk_send_head = NULL;
2299 init_timer(&sk->sk_timer);
2301 sk->sk_allocation = GFP_KERNEL;
2302 sk->sk_rcvbuf = sysctl_rmem_default;
2303 sk->sk_sndbuf = sysctl_wmem_default;
2304 sk->sk_state = TCP_CLOSE;
2305 sk_set_socket(sk, sock);
2307 sock_set_flag(sk, SOCK_ZAPPED);
2310 sk->sk_type = sock->type;
2311 sk->sk_wq = sock->wq;
2316 spin_lock_init(&sk->sk_dst_lock);
2317 rwlock_init(&sk->sk_callback_lock);
2318 lockdep_set_class_and_name(&sk->sk_callback_lock,
2319 af_callback_keys + sk->sk_family,
2320 af_family_clock_key_strings[sk->sk_family]);
2322 sk->sk_state_change = sock_def_wakeup;
2323 sk->sk_data_ready = sock_def_readable;
2324 sk->sk_write_space = sock_def_write_space;
2325 sk->sk_error_report = sock_def_error_report;
2326 sk->sk_destruct = sock_def_destruct;
2328 sk->sk_frag.page = NULL;
2329 sk->sk_frag.offset = 0;
2330 sk->sk_peek_off = -1;
2332 sk->sk_peer_pid = NULL;
2333 sk->sk_peer_cred = NULL;
2334 sk->sk_write_pending = 0;
2335 sk->sk_rcvlowat = 1;
2336 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2337 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2339 sk->sk_stamp = ktime_set(-1L, 0);
2341 #ifdef CONFIG_NET_RX_BUSY_POLL
2343 sk->sk_ll_usec = sysctl_net_busy_read;
2346 sk->sk_max_pacing_rate = ~0U;
2347 sk->sk_pacing_rate = ~0U;
2349 * Before updating sk_refcnt, we must commit prior changes to memory
2350 * (Documentation/RCU/rculist_nulls.txt for details)
2353 atomic_set(&sk->sk_refcnt, 1);
2354 atomic_set(&sk->sk_drops, 0);
2356 EXPORT_SYMBOL(sock_init_data);
2358 void lock_sock_nested(struct sock *sk, int subclass)
2361 spin_lock_bh(&sk->sk_lock.slock);
2362 if (sk->sk_lock.owned)
2364 sk->sk_lock.owned = 1;
2365 spin_unlock(&sk->sk_lock.slock);
2367 * The sk_lock has mutex_lock() semantics here:
2369 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2372 EXPORT_SYMBOL(lock_sock_nested);
2374 void release_sock(struct sock *sk)
2377 * The sk_lock has mutex_unlock() semantics:
2379 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2381 spin_lock_bh(&sk->sk_lock.slock);
2382 if (sk->sk_backlog.tail)
2385 if (sk->sk_prot->release_cb)
2386 sk->sk_prot->release_cb(sk);
2388 sk->sk_lock.owned = 0;
2389 if (waitqueue_active(&sk->sk_lock.wq))
2390 wake_up(&sk->sk_lock.wq);
2391 spin_unlock_bh(&sk->sk_lock.slock);
2393 EXPORT_SYMBOL(release_sock);
2396 * lock_sock_fast - fast version of lock_sock
2399 * This version should be used for very small section, where process wont block
2400 * return false if fast path is taken
2401 * sk_lock.slock locked, owned = 0, BH disabled
2402 * return true if slow path is taken
2403 * sk_lock.slock unlocked, owned = 1, BH enabled
2405 bool lock_sock_fast(struct sock *sk)
2408 spin_lock_bh(&sk->sk_lock.slock);
2410 if (!sk->sk_lock.owned)
2412 * Note : We must disable BH
2417 sk->sk_lock.owned = 1;
2418 spin_unlock(&sk->sk_lock.slock);
2420 * The sk_lock has mutex_lock() semantics here:
2422 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2426 EXPORT_SYMBOL(lock_sock_fast);
2428 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2431 if (!sock_flag(sk, SOCK_TIMESTAMP))
2432 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2433 tv = ktime_to_timeval(sk->sk_stamp);
2434 if (tv.tv_sec == -1)
2436 if (tv.tv_sec == 0) {
2437 sk->sk_stamp = ktime_get_real();
2438 tv = ktime_to_timeval(sk->sk_stamp);
2440 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
2442 EXPORT_SYMBOL(sock_get_timestamp);
2444 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2447 if (!sock_flag(sk, SOCK_TIMESTAMP))
2448 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2449 ts = ktime_to_timespec(sk->sk_stamp);
2450 if (ts.tv_sec == -1)
2452 if (ts.tv_sec == 0) {
2453 sk->sk_stamp = ktime_get_real();
2454 ts = ktime_to_timespec(sk->sk_stamp);
2456 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2458 EXPORT_SYMBOL(sock_get_timestampns);
2460 void sock_enable_timestamp(struct sock *sk, int flag)
2462 if (!sock_flag(sk, flag)) {
2463 unsigned long previous_flags = sk->sk_flags;
2465 sock_set_flag(sk, flag);
2467 * we just set one of the two flags which require net
2468 * time stamping, but time stamping might have been on
2469 * already because of the other one
2471 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
2472 net_enable_timestamp();
2476 int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2477 int level, int type)
2479 struct sock_exterr_skb *serr;
2480 struct sk_buff *skb, *skb2;
2484 skb = skb_dequeue(&sk->sk_error_queue);
2490 msg->msg_flags |= MSG_TRUNC;
2493 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2497 sock_recv_timestamp(msg, sk, skb);
2499 serr = SKB_EXT_ERR(skb);
2500 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2502 msg->msg_flags |= MSG_ERRQUEUE;
2505 /* Reset and regenerate socket error */
2506 spin_lock_bh(&sk->sk_error_queue.lock);
2508 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
2509 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
2510 spin_unlock_bh(&sk->sk_error_queue.lock);
2511 sk->sk_error_report(sk);
2513 spin_unlock_bh(&sk->sk_error_queue.lock);
2520 EXPORT_SYMBOL(sock_recv_errqueue);
2523 * Get a socket option on an socket.
2525 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2526 * asynchronous errors should be reported by getsockopt. We assume
2527 * this means if you specify SO_ERROR (otherwise whats the point of it).
2529 int sock_common_getsockopt(struct socket *sock, int level, int optname,
2530 char __user *optval, int __user *optlen)
2532 struct sock *sk = sock->sk;
2534 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2536 EXPORT_SYMBOL(sock_common_getsockopt);
2538 #ifdef CONFIG_COMPAT
2539 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2540 char __user *optval, int __user *optlen)
2542 struct sock *sk = sock->sk;
2544 if (sk->sk_prot->compat_getsockopt != NULL)
2545 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2547 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2549 EXPORT_SYMBOL(compat_sock_common_getsockopt);
2552 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2553 struct msghdr *msg, size_t size, int flags)
2555 struct sock *sk = sock->sk;
2559 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2560 flags & ~MSG_DONTWAIT, &addr_len);
2562 msg->msg_namelen = addr_len;
2565 EXPORT_SYMBOL(sock_common_recvmsg);
2568 * Set socket options on an inet socket.
2570 int sock_common_setsockopt(struct socket *sock, int level, int optname,
2571 char __user *optval, unsigned int optlen)
2573 struct sock *sk = sock->sk;
2575 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2577 EXPORT_SYMBOL(sock_common_setsockopt);
2579 #ifdef CONFIG_COMPAT
2580 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2581 char __user *optval, unsigned int optlen)
2583 struct sock *sk = sock->sk;
2585 if (sk->sk_prot->compat_setsockopt != NULL)
2586 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2588 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2590 EXPORT_SYMBOL(compat_sock_common_setsockopt);
2593 void sk_common_release(struct sock *sk)
2595 if (sk->sk_prot->destroy)
2596 sk->sk_prot->destroy(sk);
2599 * Observation: when sock_common_release is called, processes have
2600 * no access to socket. But net still has.
2601 * Step one, detach it from networking:
2603 * A. Remove from hash tables.
2606 sk->sk_prot->unhash(sk);
2609 * In this point socket cannot receive new packets, but it is possible
2610 * that some packets are in flight because some CPU runs receiver and
2611 * did hash table lookup before we unhashed socket. They will achieve
2612 * receive queue and will be purged by socket destructor.
2614 * Also we still have packets pending on receive queue and probably,
2615 * our own packets waiting in device queues. sock_destroy will drain
2616 * receive queue, but transmitted packets will delay socket destruction
2617 * until the last reference will be released.
2622 xfrm_sk_free_policy(sk);
2624 sk_refcnt_debug_release(sk);
2626 if (sk->sk_frag.page) {
2627 put_page(sk->sk_frag.page);
2628 sk->sk_frag.page = NULL;
2633 EXPORT_SYMBOL(sk_common_release);
2635 #ifdef CONFIG_PROC_FS
2636 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
2638 int val[PROTO_INUSE_NR];
2641 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2643 #ifdef CONFIG_NET_NS
2644 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2646 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
2648 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2650 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2652 int cpu, idx = prot->inuse_idx;
2655 for_each_possible_cpu(cpu)
2656 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2658 return res >= 0 ? res : 0;
2660 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2662 static int __net_init sock_inuse_init_net(struct net *net)
2664 net->core.inuse = alloc_percpu(struct prot_inuse);
2665 return net->core.inuse ? 0 : -ENOMEM;
2668 static void __net_exit sock_inuse_exit_net(struct net *net)
2670 free_percpu(net->core.inuse);
2673 static struct pernet_operations net_inuse_ops = {
2674 .init = sock_inuse_init_net,
2675 .exit = sock_inuse_exit_net,
2678 static __init int net_inuse_init(void)
2680 if (register_pernet_subsys(&net_inuse_ops))
2681 panic("Cannot initialize net inuse counters");
2686 core_initcall(net_inuse_init);
2688 static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2690 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2692 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
2694 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2696 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2698 int cpu, idx = prot->inuse_idx;
2701 for_each_possible_cpu(cpu)
2702 res += per_cpu(prot_inuse, cpu).val[idx];
2704 return res >= 0 ? res : 0;
2706 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2709 static void assign_proto_idx(struct proto *prot)
2711 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2713 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2714 pr_err("PROTO_INUSE_NR exhausted\n");
2718 set_bit(prot->inuse_idx, proto_inuse_idx);
2721 static void release_proto_idx(struct proto *prot)
2723 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2724 clear_bit(prot->inuse_idx, proto_inuse_idx);
2727 static inline void assign_proto_idx(struct proto *prot)
2731 static inline void release_proto_idx(struct proto *prot)
2736 int proto_register(struct proto *prot, int alloc_slab)
2739 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2740 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2743 if (prot->slab == NULL) {
2744 pr_crit("%s: Can't create sock SLAB cache!\n",
2749 if (prot->rsk_prot != NULL) {
2750 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
2751 if (prot->rsk_prot->slab_name == NULL)
2752 goto out_free_sock_slab;
2754 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2755 prot->rsk_prot->obj_size, 0,
2756 SLAB_HWCACHE_ALIGN, NULL);
2758 if (prot->rsk_prot->slab == NULL) {
2759 pr_crit("%s: Can't create request sock SLAB cache!\n",
2761 goto out_free_request_sock_slab_name;
2765 if (prot->twsk_prot != NULL) {
2766 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
2768 if (prot->twsk_prot->twsk_slab_name == NULL)
2769 goto out_free_request_sock_slab;
2771 prot->twsk_prot->twsk_slab =
2772 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2773 prot->twsk_prot->twsk_obj_size,
2775 SLAB_HWCACHE_ALIGN |
2778 if (prot->twsk_prot->twsk_slab == NULL)
2779 goto out_free_timewait_sock_slab_name;
2783 mutex_lock(&proto_list_mutex);
2784 list_add(&prot->node, &proto_list);
2785 assign_proto_idx(prot);
2786 mutex_unlock(&proto_list_mutex);
2789 out_free_timewait_sock_slab_name:
2790 kfree(prot->twsk_prot->twsk_slab_name);
2791 out_free_request_sock_slab:
2792 if (prot->rsk_prot && prot->rsk_prot->slab) {
2793 kmem_cache_destroy(prot->rsk_prot->slab);
2794 prot->rsk_prot->slab = NULL;
2796 out_free_request_sock_slab_name:
2798 kfree(prot->rsk_prot->slab_name);
2800 kmem_cache_destroy(prot->slab);
2805 EXPORT_SYMBOL(proto_register);
2807 void proto_unregister(struct proto *prot)
2809 mutex_lock(&proto_list_mutex);
2810 release_proto_idx(prot);
2811 list_del(&prot->node);
2812 mutex_unlock(&proto_list_mutex);
2814 if (prot->slab != NULL) {
2815 kmem_cache_destroy(prot->slab);
2819 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2820 kmem_cache_destroy(prot->rsk_prot->slab);
2821 kfree(prot->rsk_prot->slab_name);
2822 prot->rsk_prot->slab = NULL;
2825 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2826 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2827 kfree(prot->twsk_prot->twsk_slab_name);
2828 prot->twsk_prot->twsk_slab = NULL;
2831 EXPORT_SYMBOL(proto_unregister);
2833 #ifdef CONFIG_PROC_FS
2834 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2835 __acquires(proto_list_mutex)
2837 mutex_lock(&proto_list_mutex);
2838 return seq_list_start_head(&proto_list, *pos);
2841 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2843 return seq_list_next(v, &proto_list, pos);
2846 static void proto_seq_stop(struct seq_file *seq, void *v)
2847 __releases(proto_list_mutex)
2849 mutex_unlock(&proto_list_mutex);
2852 static char proto_method_implemented(const void *method)
2854 return method == NULL ? 'n' : 'y';
2856 static long sock_prot_memory_allocated(struct proto *proto)
2858 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
2861 static char *sock_prot_memory_pressure(struct proto *proto)
2863 return proto->memory_pressure != NULL ?
2864 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2867 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2870 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
2871 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2874 sock_prot_inuse_get(seq_file_net(seq), proto),
2875 sock_prot_memory_allocated(proto),
2876 sock_prot_memory_pressure(proto),
2878 proto->slab == NULL ? "no" : "yes",
2879 module_name(proto->owner),
2880 proto_method_implemented(proto->close),
2881 proto_method_implemented(proto->connect),
2882 proto_method_implemented(proto->disconnect),
2883 proto_method_implemented(proto->accept),
2884 proto_method_implemented(proto->ioctl),
2885 proto_method_implemented(proto->init),
2886 proto_method_implemented(proto->destroy),
2887 proto_method_implemented(proto->shutdown),
2888 proto_method_implemented(proto->setsockopt),
2889 proto_method_implemented(proto->getsockopt),
2890 proto_method_implemented(proto->sendmsg),
2891 proto_method_implemented(proto->recvmsg),
2892 proto_method_implemented(proto->sendpage),
2893 proto_method_implemented(proto->bind),
2894 proto_method_implemented(proto->backlog_rcv),
2895 proto_method_implemented(proto->hash),
2896 proto_method_implemented(proto->unhash),
2897 proto_method_implemented(proto->get_port),
2898 proto_method_implemented(proto->enter_memory_pressure));
2901 static int proto_seq_show(struct seq_file *seq, void *v)
2903 if (v == &proto_list)
2904 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2913 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2915 proto_seq_printf(seq, list_entry(v, struct proto, node));
2919 static const struct seq_operations proto_seq_ops = {
2920 .start = proto_seq_start,
2921 .next = proto_seq_next,
2922 .stop = proto_seq_stop,
2923 .show = proto_seq_show,
2926 static int proto_seq_open(struct inode *inode, struct file *file)
2928 return seq_open_net(inode, file, &proto_seq_ops,
2929 sizeof(struct seq_net_private));
2932 static const struct file_operations proto_seq_fops = {
2933 .owner = THIS_MODULE,
2934 .open = proto_seq_open,
2936 .llseek = seq_lseek,
2937 .release = seq_release_net,
2940 static __net_init int proto_init_net(struct net *net)
2942 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
2948 static __net_exit void proto_exit_net(struct net *net)
2950 remove_proc_entry("protocols", net->proc_net);
2954 static __net_initdata struct pernet_operations proto_net_ops = {
2955 .init = proto_init_net,
2956 .exit = proto_exit_net,
2959 static int __init proto_init(void)
2961 return register_pernet_subsys(&proto_net_ops);
2964 subsys_initcall(proto_init);
2966 #endif /* PROC_FS */