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/sched/mm.h>
106 #include <linux/timer.h>
107 #include <linux/string.h>
108 #include <linux/sockios.h>
109 #include <linux/net.h>
110 #include <linux/mm.h>
111 #include <linux/slab.h>
112 #include <linux/interrupt.h>
113 #include <linux/poll.h>
114 #include <linux/tcp.h>
115 #include <linux/init.h>
116 #include <linux/highmem.h>
117 #include <linux/user_namespace.h>
118 #include <linux/static_key.h>
119 #include <linux/memcontrol.h>
120 #include <linux/prefetch.h>
122 #include <linux/uaccess.h>
124 #include <linux/netdevice.h>
125 #include <net/protocol.h>
126 #include <linux/skbuff.h>
127 #include <net/net_namespace.h>
128 #include <net/request_sock.h>
129 #include <net/sock.h>
130 #include <linux/net_tstamp.h>
131 #include <net/xfrm.h>
132 #include <linux/ipsec.h>
133 #include <net/cls_cgroup.h>
134 #include <net/netprio_cgroup.h>
135 #include <linux/sock_diag.h>
137 #include <linux/filter.h>
138 #include <net/sock_reuseport.h>
140 #include <trace/events/sock.h>
146 #include <net/busy_poll.h>
148 static DEFINE_MUTEX(proto_list_mutex);
149 static LIST_HEAD(proto_list);
152 * sk_ns_capable - General socket capability test
153 * @sk: Socket to use a capability on or through
154 * @user_ns: The user namespace of the capability to use
155 * @cap: The capability to use
157 * Test to see if the opener of the socket had when the socket was
158 * created and the current process has the capability @cap in the user
159 * namespace @user_ns.
161 bool sk_ns_capable(const struct sock *sk,
162 struct user_namespace *user_ns, int cap)
164 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
165 ns_capable(user_ns, cap);
167 EXPORT_SYMBOL(sk_ns_capable);
170 * sk_capable - Socket global capability test
171 * @sk: Socket to use a capability on or through
172 * @cap: The global capability to use
174 * Test to see if the opener of the socket had when the socket was
175 * created and the current process has the capability @cap in all user
178 bool sk_capable(const struct sock *sk, int cap)
180 return sk_ns_capable(sk, &init_user_ns, cap);
182 EXPORT_SYMBOL(sk_capable);
185 * sk_net_capable - Network namespace socket capability test
186 * @sk: Socket to use a capability on or through
187 * @cap: The capability to use
189 * Test to see if the opener of the socket had when the socket was created
190 * and the current process has the capability @cap over the network namespace
191 * the socket is a member of.
193 bool sk_net_capable(const struct sock *sk, int cap)
195 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
197 EXPORT_SYMBOL(sk_net_capable);
200 * Each address family might have different locking rules, so we have
201 * one slock key per address family and separate keys for internal and
204 static struct lock_class_key af_family_keys[AF_MAX];
205 static struct lock_class_key af_family_kern_keys[AF_MAX];
206 static struct lock_class_key af_family_slock_keys[AF_MAX];
207 static struct lock_class_key af_family_kern_slock_keys[AF_MAX];
210 * Make lock validator output more readable. (we pre-construct these
211 * strings build-time, so that runtime initialization of socket
215 #define _sock_locks(x) \
216 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \
217 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \
218 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \
219 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \
220 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \
221 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \
222 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \
223 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \
224 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \
225 x "27" , x "28" , x "AF_CAN" , \
226 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \
227 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \
228 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \
229 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \
230 x "AF_QIPCRTR", x "AF_SMC" , x "AF_MAX"
232 static const char *const af_family_key_strings[AF_MAX+1] = {
233 _sock_locks("sk_lock-")
235 static const char *const af_family_slock_key_strings[AF_MAX+1] = {
236 _sock_locks("slock-")
238 static const char *const af_family_clock_key_strings[AF_MAX+1] = {
239 _sock_locks("clock-")
242 static const char *const af_family_kern_key_strings[AF_MAX+1] = {
243 _sock_locks("k-sk_lock-")
245 static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = {
246 _sock_locks("k-slock-")
248 static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = {
249 _sock_locks("k-clock-")
251 static const char *const af_family_rlock_key_strings[AF_MAX+1] = {
252 "rlock-AF_UNSPEC", "rlock-AF_UNIX" , "rlock-AF_INET" ,
253 "rlock-AF_AX25" , "rlock-AF_IPX" , "rlock-AF_APPLETALK",
254 "rlock-AF_NETROM", "rlock-AF_BRIDGE" , "rlock-AF_ATMPVC" ,
255 "rlock-AF_X25" , "rlock-AF_INET6" , "rlock-AF_ROSE" ,
256 "rlock-AF_DECnet", "rlock-AF_NETBEUI" , "rlock-AF_SECURITY" ,
257 "rlock-AF_KEY" , "rlock-AF_NETLINK" , "rlock-AF_PACKET" ,
258 "rlock-AF_ASH" , "rlock-AF_ECONET" , "rlock-AF_ATMSVC" ,
259 "rlock-AF_RDS" , "rlock-AF_SNA" , "rlock-AF_IRDA" ,
260 "rlock-AF_PPPOX" , "rlock-AF_WANPIPE" , "rlock-AF_LLC" ,
261 "rlock-27" , "rlock-28" , "rlock-AF_CAN" ,
262 "rlock-AF_TIPC" , "rlock-AF_BLUETOOTH", "rlock-AF_IUCV" ,
263 "rlock-AF_RXRPC" , "rlock-AF_ISDN" , "rlock-AF_PHONET" ,
264 "rlock-AF_IEEE802154", "rlock-AF_CAIF" , "rlock-AF_ALG" ,
265 "rlock-AF_NFC" , "rlock-AF_VSOCK" , "rlock-AF_KCM" ,
266 "rlock-AF_QIPCRTR", "rlock-AF_SMC" , "rlock-AF_MAX"
268 static const char *const af_family_wlock_key_strings[AF_MAX+1] = {
269 "wlock-AF_UNSPEC", "wlock-AF_UNIX" , "wlock-AF_INET" ,
270 "wlock-AF_AX25" , "wlock-AF_IPX" , "wlock-AF_APPLETALK",
271 "wlock-AF_NETROM", "wlock-AF_BRIDGE" , "wlock-AF_ATMPVC" ,
272 "wlock-AF_X25" , "wlock-AF_INET6" , "wlock-AF_ROSE" ,
273 "wlock-AF_DECnet", "wlock-AF_NETBEUI" , "wlock-AF_SECURITY" ,
274 "wlock-AF_KEY" , "wlock-AF_NETLINK" , "wlock-AF_PACKET" ,
275 "wlock-AF_ASH" , "wlock-AF_ECONET" , "wlock-AF_ATMSVC" ,
276 "wlock-AF_RDS" , "wlock-AF_SNA" , "wlock-AF_IRDA" ,
277 "wlock-AF_PPPOX" , "wlock-AF_WANPIPE" , "wlock-AF_LLC" ,
278 "wlock-27" , "wlock-28" , "wlock-AF_CAN" ,
279 "wlock-AF_TIPC" , "wlock-AF_BLUETOOTH", "wlock-AF_IUCV" ,
280 "wlock-AF_RXRPC" , "wlock-AF_ISDN" , "wlock-AF_PHONET" ,
281 "wlock-AF_IEEE802154", "wlock-AF_CAIF" , "wlock-AF_ALG" ,
282 "wlock-AF_NFC" , "wlock-AF_VSOCK" , "wlock-AF_KCM" ,
283 "wlock-AF_QIPCRTR", "wlock-AF_SMC" , "wlock-AF_MAX"
285 static const char *const af_family_elock_key_strings[AF_MAX+1] = {
286 "elock-AF_UNSPEC", "elock-AF_UNIX" , "elock-AF_INET" ,
287 "elock-AF_AX25" , "elock-AF_IPX" , "elock-AF_APPLETALK",
288 "elock-AF_NETROM", "elock-AF_BRIDGE" , "elock-AF_ATMPVC" ,
289 "elock-AF_X25" , "elock-AF_INET6" , "elock-AF_ROSE" ,
290 "elock-AF_DECnet", "elock-AF_NETBEUI" , "elock-AF_SECURITY" ,
291 "elock-AF_KEY" , "elock-AF_NETLINK" , "elock-AF_PACKET" ,
292 "elock-AF_ASH" , "elock-AF_ECONET" , "elock-AF_ATMSVC" ,
293 "elock-AF_RDS" , "elock-AF_SNA" , "elock-AF_IRDA" ,
294 "elock-AF_PPPOX" , "elock-AF_WANPIPE" , "elock-AF_LLC" ,
295 "elock-27" , "elock-28" , "elock-AF_CAN" ,
296 "elock-AF_TIPC" , "elock-AF_BLUETOOTH", "elock-AF_IUCV" ,
297 "elock-AF_RXRPC" , "elock-AF_ISDN" , "elock-AF_PHONET" ,
298 "elock-AF_IEEE802154", "elock-AF_CAIF" , "elock-AF_ALG" ,
299 "elock-AF_NFC" , "elock-AF_VSOCK" , "elock-AF_KCM" ,
300 "elock-AF_QIPCRTR", "elock-AF_SMC" , "elock-AF_MAX"
304 * sk_callback_lock and sk queues locking rules are per-address-family,
305 * so split the lock classes by using a per-AF key:
307 static struct lock_class_key af_callback_keys[AF_MAX];
308 static struct lock_class_key af_rlock_keys[AF_MAX];
309 static struct lock_class_key af_wlock_keys[AF_MAX];
310 static struct lock_class_key af_elock_keys[AF_MAX];
311 static struct lock_class_key af_kern_callback_keys[AF_MAX];
313 /* Take into consideration the size of the struct sk_buff overhead in the
314 * determination of these values, since that is non-constant across
315 * platforms. This makes socket queueing behavior and performance
316 * not depend upon such differences.
318 #define _SK_MEM_PACKETS 256
319 #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
320 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
321 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
323 /* Run time adjustable parameters. */
324 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
325 EXPORT_SYMBOL(sysctl_wmem_max);
326 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
327 EXPORT_SYMBOL(sysctl_rmem_max);
328 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
329 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
331 /* Maximal space eaten by iovec or ancillary data plus some space */
332 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
333 EXPORT_SYMBOL(sysctl_optmem_max);
335 int sysctl_tstamp_allow_data __read_mostly = 1;
337 struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
338 EXPORT_SYMBOL_GPL(memalloc_socks);
341 * sk_set_memalloc - sets %SOCK_MEMALLOC
342 * @sk: socket to set it on
344 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
345 * It's the responsibility of the admin to adjust min_free_kbytes
346 * to meet the requirements
348 void sk_set_memalloc(struct sock *sk)
350 sock_set_flag(sk, SOCK_MEMALLOC);
351 sk->sk_allocation |= __GFP_MEMALLOC;
352 static_key_slow_inc(&memalloc_socks);
354 EXPORT_SYMBOL_GPL(sk_set_memalloc);
356 void sk_clear_memalloc(struct sock *sk)
358 sock_reset_flag(sk, SOCK_MEMALLOC);
359 sk->sk_allocation &= ~__GFP_MEMALLOC;
360 static_key_slow_dec(&memalloc_socks);
363 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
364 * progress of swapping. SOCK_MEMALLOC may be cleared while
365 * it has rmem allocations due to the last swapfile being deactivated
366 * but there is a risk that the socket is unusable due to exceeding
367 * the rmem limits. Reclaim the reserves and obey rmem limits again.
371 EXPORT_SYMBOL_GPL(sk_clear_memalloc);
373 int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
376 unsigned int noreclaim_flag;
378 /* these should have been dropped before queueing */
379 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
381 noreclaim_flag = memalloc_noreclaim_save();
382 ret = sk->sk_backlog_rcv(sk, skb);
383 memalloc_noreclaim_restore(noreclaim_flag);
387 EXPORT_SYMBOL(__sk_backlog_rcv);
389 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
393 if (optlen < sizeof(tv))
395 if (copy_from_user(&tv, optval, sizeof(tv)))
397 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
401 static int warned __read_mostly;
404 if (warned < 10 && net_ratelimit()) {
406 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
407 __func__, current->comm, task_pid_nr(current));
411 *timeo_p = MAX_SCHEDULE_TIMEOUT;
412 if (tv.tv_sec == 0 && tv.tv_usec == 0)
414 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
415 *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP(tv.tv_usec, USEC_PER_SEC / HZ);
419 static void sock_warn_obsolete_bsdism(const char *name)
422 static char warncomm[TASK_COMM_LEN];
423 if (strcmp(warncomm, current->comm) && warned < 5) {
424 strcpy(warncomm, current->comm);
425 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
431 static bool sock_needs_netstamp(const struct sock *sk)
433 switch (sk->sk_family) {
442 static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
444 if (sk->sk_flags & flags) {
445 sk->sk_flags &= ~flags;
446 if (sock_needs_netstamp(sk) &&
447 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
448 net_disable_timestamp();
453 int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
456 struct sk_buff_head *list = &sk->sk_receive_queue;
458 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
459 atomic_inc(&sk->sk_drops);
460 trace_sock_rcvqueue_full(sk, skb);
464 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
465 atomic_inc(&sk->sk_drops);
470 skb_set_owner_r(skb, sk);
472 /* we escape from rcu protected region, make sure we dont leak
477 spin_lock_irqsave(&list->lock, flags);
478 sock_skb_set_dropcount(sk, skb);
479 __skb_queue_tail(list, skb);
480 spin_unlock_irqrestore(&list->lock, flags);
482 if (!sock_flag(sk, SOCK_DEAD))
483 sk->sk_data_ready(sk);
486 EXPORT_SYMBOL(__sock_queue_rcv_skb);
488 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
492 err = sk_filter(sk, skb);
496 return __sock_queue_rcv_skb(sk, skb);
498 EXPORT_SYMBOL(sock_queue_rcv_skb);
500 int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
501 const int nested, unsigned int trim_cap, bool refcounted)
503 int rc = NET_RX_SUCCESS;
505 if (sk_filter_trim_cap(sk, skb, trim_cap))
506 goto discard_and_relse;
510 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
511 atomic_inc(&sk->sk_drops);
512 goto discard_and_relse;
515 bh_lock_sock_nested(sk);
518 if (!sock_owned_by_user(sk)) {
520 * trylock + unlock semantics:
522 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
524 rc = sk_backlog_rcv(sk, skb);
526 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
527 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
529 atomic_inc(&sk->sk_drops);
530 goto discard_and_relse;
542 EXPORT_SYMBOL(__sk_receive_skb);
544 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
546 struct dst_entry *dst = __sk_dst_get(sk);
548 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
549 sk_tx_queue_clear(sk);
550 sk->sk_dst_pending_confirm = 0;
551 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
558 EXPORT_SYMBOL(__sk_dst_check);
560 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
562 struct dst_entry *dst = sk_dst_get(sk);
564 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
572 EXPORT_SYMBOL(sk_dst_check);
574 static int sock_setbindtodevice(struct sock *sk, char __user *optval,
577 int ret = -ENOPROTOOPT;
578 #ifdef CONFIG_NETDEVICES
579 struct net *net = sock_net(sk);
580 char devname[IFNAMSIZ];
585 if (!ns_capable(net->user_ns, CAP_NET_RAW))
592 /* Bind this socket to a particular device like "eth0",
593 * as specified in the passed interface name. If the
594 * name is "" or the option length is zero the socket
597 if (optlen > IFNAMSIZ - 1)
598 optlen = IFNAMSIZ - 1;
599 memset(devname, 0, sizeof(devname));
602 if (copy_from_user(devname, optval, optlen))
606 if (devname[0] != '\0') {
607 struct net_device *dev;
610 dev = dev_get_by_name_rcu(net, devname);
612 index = dev->ifindex;
620 sk->sk_bound_dev_if = index;
632 static int sock_getbindtodevice(struct sock *sk, char __user *optval,
633 int __user *optlen, int len)
635 int ret = -ENOPROTOOPT;
636 #ifdef CONFIG_NETDEVICES
637 struct net *net = sock_net(sk);
638 char devname[IFNAMSIZ];
640 if (sk->sk_bound_dev_if == 0) {
649 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
653 len = strlen(devname) + 1;
656 if (copy_to_user(optval, devname, len))
661 if (put_user(len, optlen))
672 static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
675 sock_set_flag(sk, bit);
677 sock_reset_flag(sk, bit);
680 bool sk_mc_loop(struct sock *sk)
682 if (dev_recursion_level())
686 switch (sk->sk_family) {
688 return inet_sk(sk)->mc_loop;
689 #if IS_ENABLED(CONFIG_IPV6)
691 return inet6_sk(sk)->mc_loop;
697 EXPORT_SYMBOL(sk_mc_loop);
700 * This is meant for all protocols to use and covers goings on
701 * at the socket level. Everything here is generic.
704 int sock_setsockopt(struct socket *sock, int level, int optname,
705 char __user *optval, unsigned int optlen)
707 struct sock *sk = sock->sk;
714 * Options without arguments
717 if (optname == SO_BINDTODEVICE)
718 return sock_setbindtodevice(sk, optval, optlen);
720 if (optlen < sizeof(int))
723 if (get_user(val, (int __user *)optval))
726 valbool = val ? 1 : 0;
732 if (val && !capable(CAP_NET_ADMIN))
735 sock_valbool_flag(sk, SOCK_DBG, valbool);
738 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
741 sk->sk_reuseport = valbool;
750 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
753 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
756 /* Don't error on this BSD doesn't and if you think
757 * about it this is right. Otherwise apps have to
758 * play 'guess the biggest size' games. RCVBUF/SNDBUF
759 * are treated in BSD as hints
761 val = min_t(u32, val, sysctl_wmem_max);
763 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
764 sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF);
765 /* Wake up sending tasks if we upped the value. */
766 sk->sk_write_space(sk);
770 if (!capable(CAP_NET_ADMIN)) {
777 /* Don't error on this BSD doesn't and if you think
778 * about it this is right. Otherwise apps have to
779 * play 'guess the biggest size' games. RCVBUF/SNDBUF
780 * are treated in BSD as hints
782 val = min_t(u32, val, sysctl_rmem_max);
784 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
786 * We double it on the way in to account for
787 * "struct sk_buff" etc. overhead. Applications
788 * assume that the SO_RCVBUF setting they make will
789 * allow that much actual data to be received on that
792 * Applications are unaware that "struct sk_buff" and
793 * other overheads allocate from the receive buffer
794 * during socket buffer allocation.
796 * And after considering the possible alternatives,
797 * returning the value we actually used in getsockopt
798 * is the most desirable behavior.
800 sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF);
804 if (!capable(CAP_NET_ADMIN)) {
811 if (sk->sk_prot->keepalive)
812 sk->sk_prot->keepalive(sk, valbool);
813 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
817 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
821 sk->sk_no_check_tx = valbool;
825 if ((val >= 0 && val <= 6) ||
826 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
827 sk->sk_priority = val;
833 if (optlen < sizeof(ling)) {
834 ret = -EINVAL; /* 1003.1g */
837 if (copy_from_user(&ling, optval, sizeof(ling))) {
842 sock_reset_flag(sk, SOCK_LINGER);
844 #if (BITS_PER_LONG == 32)
845 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
846 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
849 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
850 sock_set_flag(sk, SOCK_LINGER);
855 sock_warn_obsolete_bsdism("setsockopt");
860 set_bit(SOCK_PASSCRED, &sock->flags);
862 clear_bit(SOCK_PASSCRED, &sock->flags);
868 if (optname == SO_TIMESTAMP)
869 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
871 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
872 sock_set_flag(sk, SOCK_RCVTSTAMP);
873 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
875 sock_reset_flag(sk, SOCK_RCVTSTAMP);
876 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
880 case SO_TIMESTAMPING:
881 if (val & ~SOF_TIMESTAMPING_MASK) {
886 if (val & SOF_TIMESTAMPING_OPT_ID &&
887 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
888 if (sk->sk_protocol == IPPROTO_TCP &&
889 sk->sk_type == SOCK_STREAM) {
890 if ((1 << sk->sk_state) &
891 (TCPF_CLOSE | TCPF_LISTEN)) {
895 sk->sk_tskey = tcp_sk(sk)->snd_una;
901 if (val & SOF_TIMESTAMPING_OPT_STATS &&
902 !(val & SOF_TIMESTAMPING_OPT_TSONLY)) {
907 sk->sk_tsflags = val;
908 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
909 sock_enable_timestamp(sk,
910 SOCK_TIMESTAMPING_RX_SOFTWARE);
912 sock_disable_timestamp(sk,
913 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
919 sk->sk_rcvlowat = val ? : 1;
923 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
927 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
930 case SO_ATTACH_FILTER:
932 if (optlen == sizeof(struct sock_fprog)) {
933 struct sock_fprog fprog;
936 if (copy_from_user(&fprog, optval, sizeof(fprog)))
939 ret = sk_attach_filter(&fprog, sk);
945 if (optlen == sizeof(u32)) {
949 if (copy_from_user(&ufd, optval, sizeof(ufd)))
952 ret = sk_attach_bpf(ufd, sk);
956 case SO_ATTACH_REUSEPORT_CBPF:
958 if (optlen == sizeof(struct sock_fprog)) {
959 struct sock_fprog fprog;
962 if (copy_from_user(&fprog, optval, sizeof(fprog)))
965 ret = sk_reuseport_attach_filter(&fprog, sk);
969 case SO_ATTACH_REUSEPORT_EBPF:
971 if (optlen == sizeof(u32)) {
975 if (copy_from_user(&ufd, optval, sizeof(ufd)))
978 ret = sk_reuseport_attach_bpf(ufd, sk);
982 case SO_DETACH_FILTER:
983 ret = sk_detach_filter(sk);
987 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
990 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
995 set_bit(SOCK_PASSSEC, &sock->flags);
997 clear_bit(SOCK_PASSSEC, &sock->flags);
1000 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1007 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
1010 case SO_WIFI_STATUS:
1011 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
1015 if (sock->ops->set_peek_off)
1016 ret = sock->ops->set_peek_off(sk, val);
1022 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
1025 case SO_SELECT_ERR_QUEUE:
1026 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
1029 #ifdef CONFIG_NET_RX_BUSY_POLL
1031 /* allow unprivileged users to decrease the value */
1032 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
1038 sk->sk_ll_usec = val;
1043 case SO_MAX_PACING_RATE:
1044 sk->sk_max_pacing_rate = val;
1045 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
1046 sk->sk_max_pacing_rate);
1049 case SO_INCOMING_CPU:
1050 sk->sk_incoming_cpu = val;
1055 dst_negative_advice(sk);
1064 EXPORT_SYMBOL(sock_setsockopt);
1067 static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1068 struct ucred *ucred)
1070 ucred->pid = pid_vnr(pid);
1071 ucred->uid = ucred->gid = -1;
1073 struct user_namespace *current_ns = current_user_ns();
1075 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1076 ucred->gid = from_kgid_munged(current_ns, cred->egid);
1080 int sock_getsockopt(struct socket *sock, int level, int optname,
1081 char __user *optval, int __user *optlen)
1083 struct sock *sk = sock->sk;
1092 int lv = sizeof(int);
1095 if (get_user(len, optlen))
1100 memset(&v, 0, sizeof(v));
1104 v.val = sock_flag(sk, SOCK_DBG);
1108 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1112 v.val = sock_flag(sk, SOCK_BROADCAST);
1116 v.val = sk->sk_sndbuf;
1120 v.val = sk->sk_rcvbuf;
1124 v.val = sk->sk_reuse;
1128 v.val = sk->sk_reuseport;
1132 v.val = sock_flag(sk, SOCK_KEEPOPEN);
1136 v.val = sk->sk_type;
1140 v.val = sk->sk_protocol;
1144 v.val = sk->sk_family;
1148 v.val = -sock_error(sk);
1150 v.val = xchg(&sk->sk_err_soft, 0);
1154 v.val = sock_flag(sk, SOCK_URGINLINE);
1158 v.val = sk->sk_no_check_tx;
1162 v.val = sk->sk_priority;
1166 lv = sizeof(v.ling);
1167 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
1168 v.ling.l_linger = sk->sk_lingertime / HZ;
1172 sock_warn_obsolete_bsdism("getsockopt");
1176 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1177 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1180 case SO_TIMESTAMPNS:
1181 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
1184 case SO_TIMESTAMPING:
1185 v.val = sk->sk_tsflags;
1189 lv = sizeof(struct timeval);
1190 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1194 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1195 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * USEC_PER_SEC) / HZ;
1200 lv = sizeof(struct timeval);
1201 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1205 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1206 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * USEC_PER_SEC) / HZ;
1211 v.val = sk->sk_rcvlowat;
1219 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1224 struct ucred peercred;
1225 if (len > sizeof(peercred))
1226 len = sizeof(peercred);
1227 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1228 if (copy_to_user(optval, &peercred, len))
1237 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1241 if (copy_to_user(optval, address, len))
1246 /* Dubious BSD thing... Probably nobody even uses it, but
1247 * the UNIX standard wants it for whatever reason... -DaveM
1250 v.val = sk->sk_state == TCP_LISTEN;
1254 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1258 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1261 v.val = sk->sk_mark;
1265 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1268 case SO_WIFI_STATUS:
1269 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1273 if (!sock->ops->set_peek_off)
1276 v.val = sk->sk_peek_off;
1279 v.val = sock_flag(sk, SOCK_NOFCS);
1282 case SO_BINDTODEVICE:
1283 return sock_getbindtodevice(sk, optval, optlen, len);
1286 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1292 case SO_LOCK_FILTER:
1293 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1296 case SO_BPF_EXTENSIONS:
1297 v.val = bpf_tell_extensions();
1300 case SO_SELECT_ERR_QUEUE:
1301 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1304 #ifdef CONFIG_NET_RX_BUSY_POLL
1306 v.val = sk->sk_ll_usec;
1310 case SO_MAX_PACING_RATE:
1311 v.val = sk->sk_max_pacing_rate;
1314 case SO_INCOMING_CPU:
1315 v.val = sk->sk_incoming_cpu;
1320 u32 meminfo[SK_MEMINFO_VARS];
1322 if (get_user(len, optlen))
1325 sk_get_meminfo(sk, meminfo);
1327 len = min_t(unsigned int, len, sizeof(meminfo));
1328 if (copy_to_user(optval, &meminfo, len))
1334 #ifdef CONFIG_NET_RX_BUSY_POLL
1335 case SO_INCOMING_NAPI_ID:
1336 v.val = READ_ONCE(sk->sk_napi_id);
1338 /* aggregate non-NAPI IDs down to 0 */
1339 if (v.val < MIN_NAPI_ID)
1349 v.val64 = sock_gen_cookie(sk);
1353 /* We implement the SO_SNDLOWAT etc to not be settable
1356 return -ENOPROTOOPT;
1361 if (copy_to_user(optval, &v, len))
1364 if (put_user(len, optlen))
1370 * Initialize an sk_lock.
1372 * (We also register the sk_lock with the lock validator.)
1374 static inline void sock_lock_init(struct sock *sk)
1376 if (sk->sk_kern_sock)
1377 sock_lock_init_class_and_name(
1379 af_family_kern_slock_key_strings[sk->sk_family],
1380 af_family_kern_slock_keys + sk->sk_family,
1381 af_family_kern_key_strings[sk->sk_family],
1382 af_family_kern_keys + sk->sk_family);
1384 sock_lock_init_class_and_name(
1386 af_family_slock_key_strings[sk->sk_family],
1387 af_family_slock_keys + sk->sk_family,
1388 af_family_key_strings[sk->sk_family],
1389 af_family_keys + sk->sk_family);
1393 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1394 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1395 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1397 static void sock_copy(struct sock *nsk, const struct sock *osk)
1399 #ifdef CONFIG_SECURITY_NETWORK
1400 void *sptr = nsk->sk_security;
1402 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1404 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1405 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1407 #ifdef CONFIG_SECURITY_NETWORK
1408 nsk->sk_security = sptr;
1409 security_sk_clone(osk, nsk);
1413 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1417 struct kmem_cache *slab;
1421 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1424 if (priority & __GFP_ZERO)
1425 sk_prot_clear_nulls(sk, prot->obj_size);
1427 sk = kmalloc(prot->obj_size, priority);
1430 kmemcheck_annotate_bitfield(sk, flags);
1432 if (security_sk_alloc(sk, family, priority))
1435 if (!try_module_get(prot->owner))
1437 sk_tx_queue_clear(sk);
1443 security_sk_free(sk);
1446 kmem_cache_free(slab, sk);
1452 static void sk_prot_free(struct proto *prot, struct sock *sk)
1454 struct kmem_cache *slab;
1455 struct module *owner;
1457 owner = prot->owner;
1460 cgroup_sk_free(&sk->sk_cgrp_data);
1461 mem_cgroup_sk_free(sk);
1462 security_sk_free(sk);
1464 kmem_cache_free(slab, sk);
1471 * sk_alloc - All socket objects are allocated here
1472 * @net: the applicable net namespace
1473 * @family: protocol family
1474 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1475 * @prot: struct proto associated with this new sock instance
1476 * @kern: is this to be a kernel socket?
1478 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1479 struct proto *prot, int kern)
1483 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1485 sk->sk_family = family;
1487 * See comment in struct sock definition to understand
1488 * why we need sk_prot_creator -acme
1490 sk->sk_prot = sk->sk_prot_creator = prot;
1491 sk->sk_kern_sock = kern;
1493 sk->sk_net_refcnt = kern ? 0 : 1;
1494 if (likely(sk->sk_net_refcnt))
1496 sock_net_set(sk, net);
1497 atomic_set(&sk->sk_wmem_alloc, 1);
1499 mem_cgroup_sk_alloc(sk);
1500 cgroup_sk_alloc(&sk->sk_cgrp_data);
1501 sock_update_classid(&sk->sk_cgrp_data);
1502 sock_update_netprioidx(&sk->sk_cgrp_data);
1507 EXPORT_SYMBOL(sk_alloc);
1509 /* Sockets having SOCK_RCU_FREE will call this function after one RCU
1510 * grace period. This is the case for UDP sockets and TCP listeners.
1512 static void __sk_destruct(struct rcu_head *head)
1514 struct sock *sk = container_of(head, struct sock, sk_rcu);
1515 struct sk_filter *filter;
1517 if (sk->sk_destruct)
1518 sk->sk_destruct(sk);
1520 filter = rcu_dereference_check(sk->sk_filter,
1521 atomic_read(&sk->sk_wmem_alloc) == 0);
1523 sk_filter_uncharge(sk, filter);
1524 RCU_INIT_POINTER(sk->sk_filter, NULL);
1526 if (rcu_access_pointer(sk->sk_reuseport_cb))
1527 reuseport_detach_sock(sk);
1529 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1531 if (atomic_read(&sk->sk_omem_alloc))
1532 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1533 __func__, atomic_read(&sk->sk_omem_alloc));
1535 if (sk->sk_frag.page) {
1536 put_page(sk->sk_frag.page);
1537 sk->sk_frag.page = NULL;
1540 if (sk->sk_peer_cred)
1541 put_cred(sk->sk_peer_cred);
1542 put_pid(sk->sk_peer_pid);
1543 if (likely(sk->sk_net_refcnt))
1544 put_net(sock_net(sk));
1545 sk_prot_free(sk->sk_prot_creator, sk);
1548 void sk_destruct(struct sock *sk)
1550 if (sock_flag(sk, SOCK_RCU_FREE))
1551 call_rcu(&sk->sk_rcu, __sk_destruct);
1553 __sk_destruct(&sk->sk_rcu);
1556 static void __sk_free(struct sock *sk)
1558 if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt))
1559 sock_diag_broadcast_destroy(sk);
1564 void sk_free(struct sock *sk)
1567 * We subtract one from sk_wmem_alloc and can know if
1568 * some packets are still in some tx queue.
1569 * If not null, sock_wfree() will call __sk_free(sk) later
1571 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1574 EXPORT_SYMBOL(sk_free);
1576 static void sk_init_common(struct sock *sk)
1578 skb_queue_head_init(&sk->sk_receive_queue);
1579 skb_queue_head_init(&sk->sk_write_queue);
1580 skb_queue_head_init(&sk->sk_error_queue);
1582 rwlock_init(&sk->sk_callback_lock);
1583 lockdep_set_class_and_name(&sk->sk_receive_queue.lock,
1584 af_rlock_keys + sk->sk_family,
1585 af_family_rlock_key_strings[sk->sk_family]);
1586 lockdep_set_class_and_name(&sk->sk_write_queue.lock,
1587 af_wlock_keys + sk->sk_family,
1588 af_family_wlock_key_strings[sk->sk_family]);
1589 lockdep_set_class_and_name(&sk->sk_error_queue.lock,
1590 af_elock_keys + sk->sk_family,
1591 af_family_elock_key_strings[sk->sk_family]);
1592 lockdep_set_class_and_name(&sk->sk_callback_lock,
1593 af_callback_keys + sk->sk_family,
1594 af_family_clock_key_strings[sk->sk_family]);
1598 * sk_clone_lock - clone a socket, and lock its clone
1599 * @sk: the socket to clone
1600 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1602 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1604 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1607 bool is_charged = true;
1609 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1610 if (newsk != NULL) {
1611 struct sk_filter *filter;
1613 sock_copy(newsk, sk);
1616 if (likely(newsk->sk_net_refcnt))
1617 get_net(sock_net(newsk));
1618 sk_node_init(&newsk->sk_node);
1619 sock_lock_init(newsk);
1620 bh_lock_sock(newsk);
1621 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1622 newsk->sk_backlog.len = 0;
1624 atomic_set(&newsk->sk_rmem_alloc, 0);
1626 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1628 atomic_set(&newsk->sk_wmem_alloc, 1);
1629 atomic_set(&newsk->sk_omem_alloc, 0);
1630 sk_init_common(newsk);
1632 newsk->sk_dst_cache = NULL;
1633 newsk->sk_dst_pending_confirm = 0;
1634 newsk->sk_wmem_queued = 0;
1635 newsk->sk_forward_alloc = 0;
1636 atomic_set(&newsk->sk_drops, 0);
1637 newsk->sk_send_head = NULL;
1638 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1640 sock_reset_flag(newsk, SOCK_DONE);
1642 filter = rcu_dereference_protected(newsk->sk_filter, 1);
1644 /* though it's an empty new sock, the charging may fail
1645 * if sysctl_optmem_max was changed between creation of
1646 * original socket and cloning
1648 is_charged = sk_filter_charge(newsk, filter);
1650 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
1651 /* We need to make sure that we don't uncharge the new
1652 * socket if we couldn't charge it in the first place
1653 * as otherwise we uncharge the parent's filter.
1656 RCU_INIT_POINTER(newsk->sk_filter, NULL);
1657 sk_free_unlock_clone(newsk);
1661 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
1664 newsk->sk_err_soft = 0;
1665 newsk->sk_priority = 0;
1666 newsk->sk_incoming_cpu = raw_smp_processor_id();
1667 atomic64_set(&newsk->sk_cookie, 0);
1669 mem_cgroup_sk_alloc(newsk);
1670 cgroup_sk_alloc(&newsk->sk_cgrp_data);
1673 * Before updating sk_refcnt, we must commit prior changes to memory
1674 * (Documentation/RCU/rculist_nulls.txt for details)
1677 atomic_set(&newsk->sk_refcnt, 2);
1680 * Increment the counter in the same struct proto as the master
1681 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1682 * is the same as sk->sk_prot->socks, as this field was copied
1685 * This _changes_ the previous behaviour, where
1686 * tcp_create_openreq_child always was incrementing the
1687 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1688 * to be taken into account in all callers. -acme
1690 sk_refcnt_debug_inc(newsk);
1691 sk_set_socket(newsk, NULL);
1692 newsk->sk_wq = NULL;
1694 if (newsk->sk_prot->sockets_allocated)
1695 sk_sockets_allocated_inc(newsk);
1697 if (sock_needs_netstamp(sk) &&
1698 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1699 net_enable_timestamp();
1704 EXPORT_SYMBOL_GPL(sk_clone_lock);
1706 void sk_free_unlock_clone(struct sock *sk)
1708 /* It is still raw copy of parent, so invalidate
1709 * destructor and make plain sk_free() */
1710 sk->sk_destruct = NULL;
1714 EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
1716 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1720 sk_dst_set(sk, dst);
1721 sk->sk_route_caps = dst->dev->features;
1722 if (sk->sk_route_caps & NETIF_F_GSO)
1723 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1724 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1725 if (sk_can_gso(sk)) {
1726 if (dst->header_len) {
1727 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1729 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1730 sk->sk_gso_max_size = dst->dev->gso_max_size;
1731 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
1734 sk->sk_gso_max_segs = max_segs;
1736 EXPORT_SYMBOL_GPL(sk_setup_caps);
1739 * Simple resource managers for sockets.
1744 * Write buffer destructor automatically called from kfree_skb.
1746 void sock_wfree(struct sk_buff *skb)
1748 struct sock *sk = skb->sk;
1749 unsigned int len = skb->truesize;
1751 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1753 * Keep a reference on sk_wmem_alloc, this will be released
1754 * after sk_write_space() call
1756 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1757 sk->sk_write_space(sk);
1761 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1762 * could not do because of in-flight packets
1764 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
1767 EXPORT_SYMBOL(sock_wfree);
1769 /* This variant of sock_wfree() is used by TCP,
1770 * since it sets SOCK_USE_WRITE_QUEUE.
1772 void __sock_wfree(struct sk_buff *skb)
1774 struct sock *sk = skb->sk;
1776 if (atomic_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
1780 void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1785 if (unlikely(!sk_fullsock(sk))) {
1786 skb->destructor = sock_edemux;
1791 skb->destructor = sock_wfree;
1792 skb_set_hash_from_sk(skb, sk);
1794 * We used to take a refcount on sk, but following operation
1795 * is enough to guarantee sk_free() wont free this sock until
1796 * all in-flight packets are completed
1798 atomic_add(skb->truesize, &sk->sk_wmem_alloc);
1800 EXPORT_SYMBOL(skb_set_owner_w);
1802 /* This helper is used by netem, as it can hold packets in its
1803 * delay queue. We want to allow the owner socket to send more
1804 * packets, as if they were already TX completed by a typical driver.
1805 * But we also want to keep skb->sk set because some packet schedulers
1806 * rely on it (sch_fq for example). So we set skb->truesize to a small
1807 * amount (1) and decrease sk_wmem_alloc accordingly.
1809 void skb_orphan_partial(struct sk_buff *skb)
1811 /* If this skb is a TCP pure ACK or already went here,
1812 * we have nothing to do. 2 is already a very small truesize.
1814 if (skb->truesize <= 2)
1817 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1818 * so we do not completely orphan skb, but transfert all
1819 * accounted bytes but one, to avoid unexpected reorders.
1821 if (skb->destructor == sock_wfree
1823 || skb->destructor == tcp_wfree
1826 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1832 EXPORT_SYMBOL(skb_orphan_partial);
1835 * Read buffer destructor automatically called from kfree_skb.
1837 void sock_rfree(struct sk_buff *skb)
1839 struct sock *sk = skb->sk;
1840 unsigned int len = skb->truesize;
1842 atomic_sub(len, &sk->sk_rmem_alloc);
1843 sk_mem_uncharge(sk, len);
1845 EXPORT_SYMBOL(sock_rfree);
1848 * Buffer destructor for skbs that are not used directly in read or write
1849 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1851 void sock_efree(struct sk_buff *skb)
1855 EXPORT_SYMBOL(sock_efree);
1857 kuid_t sock_i_uid(struct sock *sk)
1861 read_lock_bh(&sk->sk_callback_lock);
1862 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
1863 read_unlock_bh(&sk->sk_callback_lock);
1866 EXPORT_SYMBOL(sock_i_uid);
1868 unsigned long sock_i_ino(struct sock *sk)
1872 read_lock_bh(&sk->sk_callback_lock);
1873 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1874 read_unlock_bh(&sk->sk_callback_lock);
1877 EXPORT_SYMBOL(sock_i_ino);
1880 * Allocate a skb from the socket's send buffer.
1882 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1885 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1886 struct sk_buff *skb = alloc_skb(size, priority);
1888 skb_set_owner_w(skb, sk);
1894 EXPORT_SYMBOL(sock_wmalloc);
1897 * Allocate a memory block from the socket's option memory buffer.
1899 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1901 if ((unsigned int)size <= sysctl_optmem_max &&
1902 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1904 /* First do the add, to avoid the race if kmalloc
1907 atomic_add(size, &sk->sk_omem_alloc);
1908 mem = kmalloc(size, priority);
1911 atomic_sub(size, &sk->sk_omem_alloc);
1915 EXPORT_SYMBOL(sock_kmalloc);
1917 /* Free an option memory block. Note, we actually want the inline
1918 * here as this allows gcc to detect the nullify and fold away the
1919 * condition entirely.
1921 static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1924 if (WARN_ON_ONCE(!mem))
1930 atomic_sub(size, &sk->sk_omem_alloc);
1933 void sock_kfree_s(struct sock *sk, void *mem, int size)
1935 __sock_kfree_s(sk, mem, size, false);
1937 EXPORT_SYMBOL(sock_kfree_s);
1939 void sock_kzfree_s(struct sock *sk, void *mem, int size)
1941 __sock_kfree_s(sk, mem, size, true);
1943 EXPORT_SYMBOL(sock_kzfree_s);
1945 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1946 I think, these locks should be removed for datagram sockets.
1948 static long sock_wait_for_wmem(struct sock *sk, long timeo)
1952 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1956 if (signal_pending(current))
1958 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1959 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1960 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1962 if (sk->sk_shutdown & SEND_SHUTDOWN)
1966 timeo = schedule_timeout(timeo);
1968 finish_wait(sk_sleep(sk), &wait);
1974 * Generic send/receive buffer handlers
1977 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1978 unsigned long data_len, int noblock,
1979 int *errcode, int max_page_order)
1981 struct sk_buff *skb;
1985 timeo = sock_sndtimeo(sk, noblock);
1987 err = sock_error(sk);
1992 if (sk->sk_shutdown & SEND_SHUTDOWN)
1995 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
1998 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1999 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2003 if (signal_pending(current))
2005 timeo = sock_wait_for_wmem(sk, timeo);
2007 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
2008 errcode, sk->sk_allocation);
2010 skb_set_owner_w(skb, sk);
2014 err = sock_intr_errno(timeo);
2019 EXPORT_SYMBOL(sock_alloc_send_pskb);
2021 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
2022 int noblock, int *errcode)
2024 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
2026 EXPORT_SYMBOL(sock_alloc_send_skb);
2028 int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
2029 struct sockcm_cookie *sockc)
2033 switch (cmsg->cmsg_type) {
2035 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2037 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2039 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
2041 case SO_TIMESTAMPING:
2042 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2045 tsflags = *(u32 *)CMSG_DATA(cmsg);
2046 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
2049 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
2050 sockc->tsflags |= tsflags;
2052 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
2054 case SCM_CREDENTIALS:
2061 EXPORT_SYMBOL(__sock_cmsg_send);
2063 int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
2064 struct sockcm_cookie *sockc)
2066 struct cmsghdr *cmsg;
2069 for_each_cmsghdr(cmsg, msg) {
2070 if (!CMSG_OK(msg, cmsg))
2072 if (cmsg->cmsg_level != SOL_SOCKET)
2074 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
2080 EXPORT_SYMBOL(sock_cmsg_send);
2082 /* On 32bit arches, an skb frag is limited to 2^15 */
2083 #define SKB_FRAG_PAGE_ORDER get_order(32768)
2086 * skb_page_frag_refill - check that a page_frag contains enough room
2087 * @sz: minimum size of the fragment we want to get
2088 * @pfrag: pointer to page_frag
2089 * @gfp: priority for memory allocation
2091 * Note: While this allocator tries to use high order pages, there is
2092 * no guarantee that allocations succeed. Therefore, @sz MUST be
2093 * less or equal than PAGE_SIZE.
2095 bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
2098 if (page_ref_count(pfrag->page) == 1) {
2102 if (pfrag->offset + sz <= pfrag->size)
2104 put_page(pfrag->page);
2108 if (SKB_FRAG_PAGE_ORDER) {
2109 /* Avoid direct reclaim but allow kswapd to wake */
2110 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
2111 __GFP_COMP | __GFP_NOWARN |
2113 SKB_FRAG_PAGE_ORDER);
2114 if (likely(pfrag->page)) {
2115 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
2119 pfrag->page = alloc_page(gfp);
2120 if (likely(pfrag->page)) {
2121 pfrag->size = PAGE_SIZE;
2126 EXPORT_SYMBOL(skb_page_frag_refill);
2128 bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2130 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2133 sk_enter_memory_pressure(sk);
2134 sk_stream_moderate_sndbuf(sk);
2137 EXPORT_SYMBOL(sk_page_frag_refill);
2139 static void __lock_sock(struct sock *sk)
2140 __releases(&sk->sk_lock.slock)
2141 __acquires(&sk->sk_lock.slock)
2146 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2147 TASK_UNINTERRUPTIBLE);
2148 spin_unlock_bh(&sk->sk_lock.slock);
2150 spin_lock_bh(&sk->sk_lock.slock);
2151 if (!sock_owned_by_user(sk))
2154 finish_wait(&sk->sk_lock.wq, &wait);
2157 static void __release_sock(struct sock *sk)
2158 __releases(&sk->sk_lock.slock)
2159 __acquires(&sk->sk_lock.slock)
2161 struct sk_buff *skb, *next;
2163 while ((skb = sk->sk_backlog.head) != NULL) {
2164 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
2166 spin_unlock_bh(&sk->sk_lock.slock);
2171 WARN_ON_ONCE(skb_dst_is_noref(skb));
2173 sk_backlog_rcv(sk, skb);
2178 } while (skb != NULL);
2180 spin_lock_bh(&sk->sk_lock.slock);
2184 * Doing the zeroing here guarantee we can not loop forever
2185 * while a wild producer attempts to flood us.
2187 sk->sk_backlog.len = 0;
2190 void __sk_flush_backlog(struct sock *sk)
2192 spin_lock_bh(&sk->sk_lock.slock);
2194 spin_unlock_bh(&sk->sk_lock.slock);
2198 * sk_wait_data - wait for data to arrive at sk_receive_queue
2199 * @sk: sock to wait on
2200 * @timeo: for how long
2201 * @skb: last skb seen on sk_receive_queue
2203 * Now socket state including sk->sk_err is changed only under lock,
2204 * hence we may omit checks after joining wait queue.
2205 * We check receive queue before schedule() only as optimization;
2206 * it is very likely that release_sock() added new data.
2208 int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
2210 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2213 add_wait_queue(sk_sleep(sk), &wait);
2214 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2215 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
2216 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2217 remove_wait_queue(sk_sleep(sk), &wait);
2220 EXPORT_SYMBOL(sk_wait_data);
2223 * __sk_mem_raise_allocated - increase memory_allocated
2225 * @size: memory size to allocate
2226 * @amt: pages to allocate
2227 * @kind: allocation type
2229 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc
2231 int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
2233 struct proto *prot = sk->sk_prot;
2234 long allocated = sk_memory_allocated_add(sk, amt);
2236 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2237 !mem_cgroup_charge_skmem(sk->sk_memcg, amt))
2238 goto suppress_allocation;
2241 if (allocated <= sk_prot_mem_limits(sk, 0)) {
2242 sk_leave_memory_pressure(sk);
2246 /* Under pressure. */
2247 if (allocated > sk_prot_mem_limits(sk, 1))
2248 sk_enter_memory_pressure(sk);
2250 /* Over hard limit. */
2251 if (allocated > sk_prot_mem_limits(sk, 2))
2252 goto suppress_allocation;
2254 /* guarantee minimum buffer size under pressure */
2255 if (kind == SK_MEM_RECV) {
2256 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2259 } else { /* SK_MEM_SEND */
2260 if (sk->sk_type == SOCK_STREAM) {
2261 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2263 } else if (atomic_read(&sk->sk_wmem_alloc) <
2264 prot->sysctl_wmem[0])
2268 if (sk_has_memory_pressure(sk)) {
2271 if (!sk_under_memory_pressure(sk))
2273 alloc = sk_sockets_allocated_read_positive(sk);
2274 if (sk_prot_mem_limits(sk, 2) > alloc *
2275 sk_mem_pages(sk->sk_wmem_queued +
2276 atomic_read(&sk->sk_rmem_alloc) +
2277 sk->sk_forward_alloc))
2281 suppress_allocation:
2283 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2284 sk_stream_moderate_sndbuf(sk);
2286 /* Fail only if socket is _under_ its sndbuf.
2287 * In this case we cannot block, so that we have to fail.
2289 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2293 trace_sock_exceed_buf_limit(sk, prot, allocated);
2295 sk_memory_allocated_sub(sk, amt);
2297 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2298 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
2302 EXPORT_SYMBOL(__sk_mem_raise_allocated);
2305 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2307 * @size: memory size to allocate
2308 * @kind: allocation type
2310 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2311 * rmem allocation. This function assumes that protocols which have
2312 * memory_pressure use sk_wmem_queued as write buffer accounting.
2314 int __sk_mem_schedule(struct sock *sk, int size, int kind)
2316 int ret, amt = sk_mem_pages(size);
2318 sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT;
2319 ret = __sk_mem_raise_allocated(sk, size, amt, kind);
2321 sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT;
2324 EXPORT_SYMBOL(__sk_mem_schedule);
2327 * __sk_mem_reduce_allocated - reclaim memory_allocated
2329 * @amount: number of quanta
2331 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
2333 void __sk_mem_reduce_allocated(struct sock *sk, int amount)
2335 sk_memory_allocated_sub(sk, amount);
2337 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2338 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
2340 if (sk_under_memory_pressure(sk) &&
2341 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2342 sk_leave_memory_pressure(sk);
2344 EXPORT_SYMBOL(__sk_mem_reduce_allocated);
2347 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
2349 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
2351 void __sk_mem_reclaim(struct sock *sk, int amount)
2353 amount >>= SK_MEM_QUANTUM_SHIFT;
2354 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
2355 __sk_mem_reduce_allocated(sk, amount);
2357 EXPORT_SYMBOL(__sk_mem_reclaim);
2359 int sk_set_peek_off(struct sock *sk, int val)
2364 sk->sk_peek_off = val;
2367 EXPORT_SYMBOL_GPL(sk_set_peek_off);
2370 * Set of default routines for initialising struct proto_ops when
2371 * the protocol does not support a particular function. In certain
2372 * cases where it makes no sense for a protocol to have a "do nothing"
2373 * function, some default processing is provided.
2376 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2380 EXPORT_SYMBOL(sock_no_bind);
2382 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
2387 EXPORT_SYMBOL(sock_no_connect);
2389 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2393 EXPORT_SYMBOL(sock_no_socketpair);
2395 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags,
2400 EXPORT_SYMBOL(sock_no_accept);
2402 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
2407 EXPORT_SYMBOL(sock_no_getname);
2409 unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
2413 EXPORT_SYMBOL(sock_no_poll);
2415 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2419 EXPORT_SYMBOL(sock_no_ioctl);
2421 int sock_no_listen(struct socket *sock, int backlog)
2425 EXPORT_SYMBOL(sock_no_listen);
2427 int sock_no_shutdown(struct socket *sock, int how)
2431 EXPORT_SYMBOL(sock_no_shutdown);
2433 int sock_no_setsockopt(struct socket *sock, int level, int optname,
2434 char __user *optval, unsigned int optlen)
2438 EXPORT_SYMBOL(sock_no_setsockopt);
2440 int sock_no_getsockopt(struct socket *sock, int level, int optname,
2441 char __user *optval, int __user *optlen)
2445 EXPORT_SYMBOL(sock_no_getsockopt);
2447 int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
2451 EXPORT_SYMBOL(sock_no_sendmsg);
2453 int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2458 EXPORT_SYMBOL(sock_no_recvmsg);
2460 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2462 /* Mirror missing mmap method error code */
2465 EXPORT_SYMBOL(sock_no_mmap);
2467 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2470 struct msghdr msg = {.msg_flags = flags};
2472 char *kaddr = kmap(page);
2473 iov.iov_base = kaddr + offset;
2475 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2479 EXPORT_SYMBOL(sock_no_sendpage);
2482 * Default Socket Callbacks
2485 static void sock_def_wakeup(struct sock *sk)
2487 struct socket_wq *wq;
2490 wq = rcu_dereference(sk->sk_wq);
2491 if (skwq_has_sleeper(wq))
2492 wake_up_interruptible_all(&wq->wait);
2496 static void sock_def_error_report(struct sock *sk)
2498 struct socket_wq *wq;
2501 wq = rcu_dereference(sk->sk_wq);
2502 if (skwq_has_sleeper(wq))
2503 wake_up_interruptible_poll(&wq->wait, POLLERR);
2504 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2508 static void sock_def_readable(struct sock *sk)
2510 struct socket_wq *wq;
2513 wq = rcu_dereference(sk->sk_wq);
2514 if (skwq_has_sleeper(wq))
2515 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
2516 POLLRDNORM | POLLRDBAND);
2517 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2521 static void sock_def_write_space(struct sock *sk)
2523 struct socket_wq *wq;
2527 /* Do not wake up a writer until he can make "significant"
2530 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
2531 wq = rcu_dereference(sk->sk_wq);
2532 if (skwq_has_sleeper(wq))
2533 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
2534 POLLWRNORM | POLLWRBAND);
2536 /* Should agree with poll, otherwise some programs break */
2537 if (sock_writeable(sk))
2538 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2544 static void sock_def_destruct(struct sock *sk)
2548 void sk_send_sigurg(struct sock *sk)
2550 if (sk->sk_socket && sk->sk_socket->file)
2551 if (send_sigurg(&sk->sk_socket->file->f_owner))
2552 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2554 EXPORT_SYMBOL(sk_send_sigurg);
2556 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2557 unsigned long expires)
2559 if (!mod_timer(timer, expires))
2562 EXPORT_SYMBOL(sk_reset_timer);
2564 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2566 if (del_timer(timer))
2569 EXPORT_SYMBOL(sk_stop_timer);
2571 void sock_init_data(struct socket *sock, struct sock *sk)
2574 sk->sk_send_head = NULL;
2576 init_timer(&sk->sk_timer);
2578 sk->sk_allocation = GFP_KERNEL;
2579 sk->sk_rcvbuf = sysctl_rmem_default;
2580 sk->sk_sndbuf = sysctl_wmem_default;
2581 sk->sk_state = TCP_CLOSE;
2582 sk_set_socket(sk, sock);
2584 sock_set_flag(sk, SOCK_ZAPPED);
2587 sk->sk_type = sock->type;
2588 sk->sk_wq = sock->wq;
2590 sk->sk_uid = SOCK_INODE(sock)->i_uid;
2593 sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0);
2596 rwlock_init(&sk->sk_callback_lock);
2597 if (sk->sk_kern_sock)
2598 lockdep_set_class_and_name(
2599 &sk->sk_callback_lock,
2600 af_kern_callback_keys + sk->sk_family,
2601 af_family_kern_clock_key_strings[sk->sk_family]);
2603 lockdep_set_class_and_name(
2604 &sk->sk_callback_lock,
2605 af_callback_keys + sk->sk_family,
2606 af_family_clock_key_strings[sk->sk_family]);
2608 sk->sk_state_change = sock_def_wakeup;
2609 sk->sk_data_ready = sock_def_readable;
2610 sk->sk_write_space = sock_def_write_space;
2611 sk->sk_error_report = sock_def_error_report;
2612 sk->sk_destruct = sock_def_destruct;
2614 sk->sk_frag.page = NULL;
2615 sk->sk_frag.offset = 0;
2616 sk->sk_peek_off = -1;
2618 sk->sk_peer_pid = NULL;
2619 sk->sk_peer_cred = NULL;
2620 sk->sk_write_pending = 0;
2621 sk->sk_rcvlowat = 1;
2622 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2623 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2625 sk->sk_stamp = SK_DEFAULT_STAMP;
2627 #ifdef CONFIG_NET_RX_BUSY_POLL
2629 sk->sk_ll_usec = sysctl_net_busy_read;
2632 sk->sk_max_pacing_rate = ~0U;
2633 sk->sk_pacing_rate = ~0U;
2634 sk->sk_incoming_cpu = -1;
2636 * Before updating sk_refcnt, we must commit prior changes to memory
2637 * (Documentation/RCU/rculist_nulls.txt for details)
2640 atomic_set(&sk->sk_refcnt, 1);
2641 atomic_set(&sk->sk_drops, 0);
2643 EXPORT_SYMBOL(sock_init_data);
2645 void lock_sock_nested(struct sock *sk, int subclass)
2648 spin_lock_bh(&sk->sk_lock.slock);
2649 if (sk->sk_lock.owned)
2651 sk->sk_lock.owned = 1;
2652 spin_unlock(&sk->sk_lock.slock);
2654 * The sk_lock has mutex_lock() semantics here:
2656 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2659 EXPORT_SYMBOL(lock_sock_nested);
2661 void release_sock(struct sock *sk)
2663 spin_lock_bh(&sk->sk_lock.slock);
2664 if (sk->sk_backlog.tail)
2667 /* Warning : release_cb() might need to release sk ownership,
2668 * ie call sock_release_ownership(sk) before us.
2670 if (sk->sk_prot->release_cb)
2671 sk->sk_prot->release_cb(sk);
2673 sock_release_ownership(sk);
2674 if (waitqueue_active(&sk->sk_lock.wq))
2675 wake_up(&sk->sk_lock.wq);
2676 spin_unlock_bh(&sk->sk_lock.slock);
2678 EXPORT_SYMBOL(release_sock);
2681 * lock_sock_fast - fast version of lock_sock
2684 * This version should be used for very small section, where process wont block
2685 * return false if fast path is taken
2686 * sk_lock.slock locked, owned = 0, BH disabled
2687 * return true if slow path is taken
2688 * sk_lock.slock unlocked, owned = 1, BH enabled
2690 bool lock_sock_fast(struct sock *sk)
2693 spin_lock_bh(&sk->sk_lock.slock);
2695 if (!sk->sk_lock.owned)
2697 * Note : We must disable BH
2702 sk->sk_lock.owned = 1;
2703 spin_unlock(&sk->sk_lock.slock);
2705 * The sk_lock has mutex_lock() semantics here:
2707 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2711 EXPORT_SYMBOL(lock_sock_fast);
2713 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2716 if (!sock_flag(sk, SOCK_TIMESTAMP))
2717 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2718 tv = ktime_to_timeval(sk->sk_stamp);
2719 if (tv.tv_sec == -1)
2721 if (tv.tv_sec == 0) {
2722 sk->sk_stamp = ktime_get_real();
2723 tv = ktime_to_timeval(sk->sk_stamp);
2725 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
2727 EXPORT_SYMBOL(sock_get_timestamp);
2729 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2732 if (!sock_flag(sk, SOCK_TIMESTAMP))
2733 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2734 ts = ktime_to_timespec(sk->sk_stamp);
2735 if (ts.tv_sec == -1)
2737 if (ts.tv_sec == 0) {
2738 sk->sk_stamp = ktime_get_real();
2739 ts = ktime_to_timespec(sk->sk_stamp);
2741 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2743 EXPORT_SYMBOL(sock_get_timestampns);
2745 void sock_enable_timestamp(struct sock *sk, int flag)
2747 if (!sock_flag(sk, flag)) {
2748 unsigned long previous_flags = sk->sk_flags;
2750 sock_set_flag(sk, flag);
2752 * we just set one of the two flags which require net
2753 * time stamping, but time stamping might have been on
2754 * already because of the other one
2756 if (sock_needs_netstamp(sk) &&
2757 !(previous_flags & SK_FLAGS_TIMESTAMP))
2758 net_enable_timestamp();
2762 int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2763 int level, int type)
2765 struct sock_exterr_skb *serr;
2766 struct sk_buff *skb;
2770 skb = sock_dequeue_err_skb(sk);
2776 msg->msg_flags |= MSG_TRUNC;
2779 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2783 sock_recv_timestamp(msg, sk, skb);
2785 serr = SKB_EXT_ERR(skb);
2786 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2788 msg->msg_flags |= MSG_ERRQUEUE;
2796 EXPORT_SYMBOL(sock_recv_errqueue);
2799 * Get a socket option on an socket.
2801 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2802 * asynchronous errors should be reported by getsockopt. We assume
2803 * this means if you specify SO_ERROR (otherwise whats the point of it).
2805 int sock_common_getsockopt(struct socket *sock, int level, int optname,
2806 char __user *optval, int __user *optlen)
2808 struct sock *sk = sock->sk;
2810 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2812 EXPORT_SYMBOL(sock_common_getsockopt);
2814 #ifdef CONFIG_COMPAT
2815 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2816 char __user *optval, int __user *optlen)
2818 struct sock *sk = sock->sk;
2820 if (sk->sk_prot->compat_getsockopt != NULL)
2821 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2823 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2825 EXPORT_SYMBOL(compat_sock_common_getsockopt);
2828 int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2831 struct sock *sk = sock->sk;
2835 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
2836 flags & ~MSG_DONTWAIT, &addr_len);
2838 msg->msg_namelen = addr_len;
2841 EXPORT_SYMBOL(sock_common_recvmsg);
2844 * Set socket options on an inet socket.
2846 int sock_common_setsockopt(struct socket *sock, int level, int optname,
2847 char __user *optval, unsigned int optlen)
2849 struct sock *sk = sock->sk;
2851 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2853 EXPORT_SYMBOL(sock_common_setsockopt);
2855 #ifdef CONFIG_COMPAT
2856 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2857 char __user *optval, unsigned int optlen)
2859 struct sock *sk = sock->sk;
2861 if (sk->sk_prot->compat_setsockopt != NULL)
2862 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2864 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2866 EXPORT_SYMBOL(compat_sock_common_setsockopt);
2869 void sk_common_release(struct sock *sk)
2871 if (sk->sk_prot->destroy)
2872 sk->sk_prot->destroy(sk);
2875 * Observation: when sock_common_release is called, processes have
2876 * no access to socket. But net still has.
2877 * Step one, detach it from networking:
2879 * A. Remove from hash tables.
2882 sk->sk_prot->unhash(sk);
2885 * In this point socket cannot receive new packets, but it is possible
2886 * that some packets are in flight because some CPU runs receiver and
2887 * did hash table lookup before we unhashed socket. They will achieve
2888 * receive queue and will be purged by socket destructor.
2890 * Also we still have packets pending on receive queue and probably,
2891 * our own packets waiting in device queues. sock_destroy will drain
2892 * receive queue, but transmitted packets will delay socket destruction
2893 * until the last reference will be released.
2898 xfrm_sk_free_policy(sk);
2900 sk_refcnt_debug_release(sk);
2904 EXPORT_SYMBOL(sk_common_release);
2906 void sk_get_meminfo(const struct sock *sk, u32 *mem)
2908 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
2910 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
2911 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
2912 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
2913 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
2914 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
2915 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
2916 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
2917 mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
2918 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
2921 #ifdef CONFIG_PROC_FS
2922 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
2924 int val[PROTO_INUSE_NR];
2927 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2929 #ifdef CONFIG_NET_NS
2930 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2932 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
2934 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2936 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2938 int cpu, idx = prot->inuse_idx;
2941 for_each_possible_cpu(cpu)
2942 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2944 return res >= 0 ? res : 0;
2946 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2948 static int __net_init sock_inuse_init_net(struct net *net)
2950 net->core.inuse = alloc_percpu(struct prot_inuse);
2951 return net->core.inuse ? 0 : -ENOMEM;
2954 static void __net_exit sock_inuse_exit_net(struct net *net)
2956 free_percpu(net->core.inuse);
2959 static struct pernet_operations net_inuse_ops = {
2960 .init = sock_inuse_init_net,
2961 .exit = sock_inuse_exit_net,
2964 static __init int net_inuse_init(void)
2966 if (register_pernet_subsys(&net_inuse_ops))
2967 panic("Cannot initialize net inuse counters");
2972 core_initcall(net_inuse_init);
2974 static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2976 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2978 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
2980 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2982 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2984 int cpu, idx = prot->inuse_idx;
2987 for_each_possible_cpu(cpu)
2988 res += per_cpu(prot_inuse, cpu).val[idx];
2990 return res >= 0 ? res : 0;
2992 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2995 static void assign_proto_idx(struct proto *prot)
2997 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2999 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
3000 pr_err("PROTO_INUSE_NR exhausted\n");
3004 set_bit(prot->inuse_idx, proto_inuse_idx);
3007 static void release_proto_idx(struct proto *prot)
3009 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
3010 clear_bit(prot->inuse_idx, proto_inuse_idx);
3013 static inline void assign_proto_idx(struct proto *prot)
3017 static inline void release_proto_idx(struct proto *prot)
3022 static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
3026 kfree(rsk_prot->slab_name);
3027 rsk_prot->slab_name = NULL;
3028 kmem_cache_destroy(rsk_prot->slab);
3029 rsk_prot->slab = NULL;
3032 static int req_prot_init(const struct proto *prot)
3034 struct request_sock_ops *rsk_prot = prot->rsk_prot;
3039 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
3041 if (!rsk_prot->slab_name)
3044 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
3045 rsk_prot->obj_size, 0,
3046 prot->slab_flags, NULL);
3048 if (!rsk_prot->slab) {
3049 pr_crit("%s: Can't create request sock SLAB cache!\n",
3056 int proto_register(struct proto *prot, int alloc_slab)
3059 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
3060 SLAB_HWCACHE_ALIGN | prot->slab_flags,
3063 if (prot->slab == NULL) {
3064 pr_crit("%s: Can't create sock SLAB cache!\n",
3069 if (req_prot_init(prot))
3070 goto out_free_request_sock_slab;
3072 if (prot->twsk_prot != NULL) {
3073 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
3075 if (prot->twsk_prot->twsk_slab_name == NULL)
3076 goto out_free_request_sock_slab;
3078 prot->twsk_prot->twsk_slab =
3079 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
3080 prot->twsk_prot->twsk_obj_size,
3084 if (prot->twsk_prot->twsk_slab == NULL)
3085 goto out_free_timewait_sock_slab_name;
3089 mutex_lock(&proto_list_mutex);
3090 list_add(&prot->node, &proto_list);
3091 assign_proto_idx(prot);
3092 mutex_unlock(&proto_list_mutex);
3095 out_free_timewait_sock_slab_name:
3096 kfree(prot->twsk_prot->twsk_slab_name);
3097 out_free_request_sock_slab:
3098 req_prot_cleanup(prot->rsk_prot);
3100 kmem_cache_destroy(prot->slab);
3105 EXPORT_SYMBOL(proto_register);
3107 void proto_unregister(struct proto *prot)
3109 mutex_lock(&proto_list_mutex);
3110 release_proto_idx(prot);
3111 list_del(&prot->node);
3112 mutex_unlock(&proto_list_mutex);
3114 kmem_cache_destroy(prot->slab);
3117 req_prot_cleanup(prot->rsk_prot);
3119 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
3120 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
3121 kfree(prot->twsk_prot->twsk_slab_name);
3122 prot->twsk_prot->twsk_slab = NULL;
3125 EXPORT_SYMBOL(proto_unregister);
3127 #ifdef CONFIG_PROC_FS
3128 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
3129 __acquires(proto_list_mutex)
3131 mutex_lock(&proto_list_mutex);
3132 return seq_list_start_head(&proto_list, *pos);
3135 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3137 return seq_list_next(v, &proto_list, pos);
3140 static void proto_seq_stop(struct seq_file *seq, void *v)
3141 __releases(proto_list_mutex)
3143 mutex_unlock(&proto_list_mutex);
3146 static char proto_method_implemented(const void *method)
3148 return method == NULL ? 'n' : 'y';
3150 static long sock_prot_memory_allocated(struct proto *proto)
3152 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
3155 static char *sock_prot_memory_pressure(struct proto *proto)
3157 return proto->memory_pressure != NULL ?
3158 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
3161 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
3164 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
3165 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3168 sock_prot_inuse_get(seq_file_net(seq), proto),
3169 sock_prot_memory_allocated(proto),
3170 sock_prot_memory_pressure(proto),
3172 proto->slab == NULL ? "no" : "yes",
3173 module_name(proto->owner),
3174 proto_method_implemented(proto->close),
3175 proto_method_implemented(proto->connect),
3176 proto_method_implemented(proto->disconnect),
3177 proto_method_implemented(proto->accept),
3178 proto_method_implemented(proto->ioctl),
3179 proto_method_implemented(proto->init),
3180 proto_method_implemented(proto->destroy),
3181 proto_method_implemented(proto->shutdown),
3182 proto_method_implemented(proto->setsockopt),
3183 proto_method_implemented(proto->getsockopt),
3184 proto_method_implemented(proto->sendmsg),
3185 proto_method_implemented(proto->recvmsg),
3186 proto_method_implemented(proto->sendpage),
3187 proto_method_implemented(proto->bind),
3188 proto_method_implemented(proto->backlog_rcv),
3189 proto_method_implemented(proto->hash),
3190 proto_method_implemented(proto->unhash),
3191 proto_method_implemented(proto->get_port),
3192 proto_method_implemented(proto->enter_memory_pressure));
3195 static int proto_seq_show(struct seq_file *seq, void *v)
3197 if (v == &proto_list)
3198 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3207 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3209 proto_seq_printf(seq, list_entry(v, struct proto, node));
3213 static const struct seq_operations proto_seq_ops = {
3214 .start = proto_seq_start,
3215 .next = proto_seq_next,
3216 .stop = proto_seq_stop,
3217 .show = proto_seq_show,
3220 static int proto_seq_open(struct inode *inode, struct file *file)
3222 return seq_open_net(inode, file, &proto_seq_ops,
3223 sizeof(struct seq_net_private));
3226 static const struct file_operations proto_seq_fops = {
3227 .owner = THIS_MODULE,
3228 .open = proto_seq_open,
3230 .llseek = seq_lseek,
3231 .release = seq_release_net,
3234 static __net_init int proto_init_net(struct net *net)
3236 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
3242 static __net_exit void proto_exit_net(struct net *net)
3244 remove_proc_entry("protocols", net->proc_net);
3248 static __net_initdata struct pernet_operations proto_net_ops = {
3249 .init = proto_init_net,
3250 .exit = proto_exit_net,
3253 static int __init proto_init(void)
3255 return register_pernet_subsys(&proto_net_ops);
3258 subsys_initcall(proto_init);
3260 #endif /* PROC_FS */
3262 #ifdef CONFIG_NET_RX_BUSY_POLL
3263 bool sk_busy_loop_end(void *p, unsigned long start_time)
3265 struct sock *sk = p;
3267 return !skb_queue_empty(&sk->sk_receive_queue) ||
3268 sk_busy_loop_timeout(sk, start_time);
3270 EXPORT_SYMBOL(sk_busy_loop_end);
3271 #endif /* CONFIG_NET_RX_BUSY_POLL */