1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
7 * Generic socket support routines. Memory allocators, socket lock/release
8 * 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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
88 #include <asm/unaligned.h>
89 #include <linux/capability.h>
90 #include <linux/errno.h>
91 #include <linux/errqueue.h>
92 #include <linux/types.h>
93 #include <linux/socket.h>
95 #include <linux/kernel.h>
96 #include <linux/module.h>
97 #include <linux/proc_fs.h>
98 #include <linux/seq_file.h>
99 #include <linux/sched.h>
100 #include <linux/sched/mm.h>
101 #include <linux/timer.h>
102 #include <linux/string.h>
103 #include <linux/sockios.h>
104 #include <linux/net.h>
105 #include <linux/mm.h>
106 #include <linux/slab.h>
107 #include <linux/interrupt.h>
108 #include <linux/poll.h>
109 #include <linux/tcp.h>
110 #include <linux/init.h>
111 #include <linux/highmem.h>
112 #include <linux/user_namespace.h>
113 #include <linux/static_key.h>
114 #include <linux/memcontrol.h>
115 #include <linux/prefetch.h>
116 #include <linux/compat.h>
118 #include <linux/uaccess.h>
120 #include <linux/netdevice.h>
121 #include <net/protocol.h>
122 #include <linux/skbuff.h>
123 #include <net/net_namespace.h>
124 #include <net/request_sock.h>
125 #include <net/sock.h>
126 #include <linux/net_tstamp.h>
127 #include <net/xfrm.h>
128 #include <linux/ipsec.h>
129 #include <net/cls_cgroup.h>
130 #include <net/netprio_cgroup.h>
131 #include <linux/sock_diag.h>
133 #include <linux/filter.h>
134 #include <net/sock_reuseport.h>
135 #include <net/bpf_sk_storage.h>
137 #include <trace/events/sock.h>
140 #include <net/busy_poll.h>
142 static DEFINE_MUTEX(proto_list_mutex);
143 static LIST_HEAD(proto_list);
145 static void sock_inuse_add(struct net *net, int val);
148 * sk_ns_capable - General socket capability test
149 * @sk: Socket to use a capability on or through
150 * @user_ns: The user namespace of the capability to use
151 * @cap: The capability to use
153 * Test to see if the opener of the socket had when the socket was
154 * created and the current process has the capability @cap in the user
155 * namespace @user_ns.
157 bool sk_ns_capable(const struct sock *sk,
158 struct user_namespace *user_ns, int cap)
160 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
161 ns_capable(user_ns, cap);
163 EXPORT_SYMBOL(sk_ns_capable);
166 * sk_capable - Socket global capability test
167 * @sk: Socket to use a capability on or through
168 * @cap: The global capability to use
170 * Test to see if the opener of the socket had when the socket was
171 * created and the current process has the capability @cap in all user
174 bool sk_capable(const struct sock *sk, int cap)
176 return sk_ns_capable(sk, &init_user_ns, cap);
178 EXPORT_SYMBOL(sk_capable);
181 * sk_net_capable - Network namespace socket capability test
182 * @sk: Socket to use a capability on or through
183 * @cap: The capability to use
185 * Test to see if the opener of the socket had when the socket was created
186 * and the current process has the capability @cap over the network namespace
187 * the socket is a member of.
189 bool sk_net_capable(const struct sock *sk, int cap)
191 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
193 EXPORT_SYMBOL(sk_net_capable);
196 * Each address family might have different locking rules, so we have
197 * one slock key per address family and separate keys for internal and
200 static struct lock_class_key af_family_keys[AF_MAX];
201 static struct lock_class_key af_family_kern_keys[AF_MAX];
202 static struct lock_class_key af_family_slock_keys[AF_MAX];
203 static struct lock_class_key af_family_kern_slock_keys[AF_MAX];
206 * Make lock validator output more readable. (we pre-construct these
207 * strings build-time, so that runtime initialization of socket
211 #define _sock_locks(x) \
212 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \
213 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \
214 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \
215 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \
216 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \
217 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \
218 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \
219 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \
220 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \
221 x "27" , x "28" , x "AF_CAN" , \
222 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \
223 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \
224 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \
225 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \
226 x "AF_QIPCRTR", x "AF_SMC" , x "AF_XDP" , \
229 static const char *const af_family_key_strings[AF_MAX+1] = {
230 _sock_locks("sk_lock-")
232 static const char *const af_family_slock_key_strings[AF_MAX+1] = {
233 _sock_locks("slock-")
235 static const char *const af_family_clock_key_strings[AF_MAX+1] = {
236 _sock_locks("clock-")
239 static const char *const af_family_kern_key_strings[AF_MAX+1] = {
240 _sock_locks("k-sk_lock-")
242 static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = {
243 _sock_locks("k-slock-")
245 static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = {
246 _sock_locks("k-clock-")
248 static const char *const af_family_rlock_key_strings[AF_MAX+1] = {
249 _sock_locks("rlock-")
251 static const char *const af_family_wlock_key_strings[AF_MAX+1] = {
252 _sock_locks("wlock-")
254 static const char *const af_family_elock_key_strings[AF_MAX+1] = {
255 _sock_locks("elock-")
259 * sk_callback_lock and sk queues locking rules are per-address-family,
260 * so split the lock classes by using a per-AF key:
262 static struct lock_class_key af_callback_keys[AF_MAX];
263 static struct lock_class_key af_rlock_keys[AF_MAX];
264 static struct lock_class_key af_wlock_keys[AF_MAX];
265 static struct lock_class_key af_elock_keys[AF_MAX];
266 static struct lock_class_key af_kern_callback_keys[AF_MAX];
268 /* Run time adjustable parameters. */
269 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
270 EXPORT_SYMBOL(sysctl_wmem_max);
271 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
272 EXPORT_SYMBOL(sysctl_rmem_max);
273 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
274 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
276 /* Maximal space eaten by iovec or ancillary data plus some space */
277 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
278 EXPORT_SYMBOL(sysctl_optmem_max);
280 int sysctl_tstamp_allow_data __read_mostly = 1;
282 DEFINE_STATIC_KEY_FALSE(memalloc_socks_key);
283 EXPORT_SYMBOL_GPL(memalloc_socks_key);
286 * sk_set_memalloc - sets %SOCK_MEMALLOC
287 * @sk: socket to set it on
289 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
290 * It's the responsibility of the admin to adjust min_free_kbytes
291 * to meet the requirements
293 void sk_set_memalloc(struct sock *sk)
295 sock_set_flag(sk, SOCK_MEMALLOC);
296 sk->sk_allocation |= __GFP_MEMALLOC;
297 static_branch_inc(&memalloc_socks_key);
299 EXPORT_SYMBOL_GPL(sk_set_memalloc);
301 void sk_clear_memalloc(struct sock *sk)
303 sock_reset_flag(sk, SOCK_MEMALLOC);
304 sk->sk_allocation &= ~__GFP_MEMALLOC;
305 static_branch_dec(&memalloc_socks_key);
308 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
309 * progress of swapping. SOCK_MEMALLOC may be cleared while
310 * it has rmem allocations due to the last swapfile being deactivated
311 * but there is a risk that the socket is unusable due to exceeding
312 * the rmem limits. Reclaim the reserves and obey rmem limits again.
316 EXPORT_SYMBOL_GPL(sk_clear_memalloc);
318 int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
321 unsigned int noreclaim_flag;
323 /* these should have been dropped before queueing */
324 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
326 noreclaim_flag = memalloc_noreclaim_save();
327 ret = sk->sk_backlog_rcv(sk, skb);
328 memalloc_noreclaim_restore(noreclaim_flag);
332 EXPORT_SYMBOL(__sk_backlog_rcv);
334 static int sock_get_timeout(long timeo, void *optval, bool old_timeval)
336 struct __kernel_sock_timeval tv;
338 if (timeo == MAX_SCHEDULE_TIMEOUT) {
342 tv.tv_sec = timeo / HZ;
343 tv.tv_usec = ((timeo % HZ) * USEC_PER_SEC) / HZ;
346 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
347 struct old_timeval32 tv32 = { tv.tv_sec, tv.tv_usec };
348 *(struct old_timeval32 *)optval = tv32;
353 struct __kernel_old_timeval old_tv;
354 old_tv.tv_sec = tv.tv_sec;
355 old_tv.tv_usec = tv.tv_usec;
356 *(struct __kernel_old_timeval *)optval = old_tv;
357 return sizeof(old_tv);
360 *(struct __kernel_sock_timeval *)optval = tv;
364 static int sock_set_timeout(long *timeo_p, sockptr_t optval, int optlen,
367 struct __kernel_sock_timeval tv;
369 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
370 struct old_timeval32 tv32;
372 if (optlen < sizeof(tv32))
375 if (copy_from_sockptr(&tv32, optval, sizeof(tv32)))
377 tv.tv_sec = tv32.tv_sec;
378 tv.tv_usec = tv32.tv_usec;
379 } else if (old_timeval) {
380 struct __kernel_old_timeval old_tv;
382 if (optlen < sizeof(old_tv))
384 if (copy_from_sockptr(&old_tv, optval, sizeof(old_tv)))
386 tv.tv_sec = old_tv.tv_sec;
387 tv.tv_usec = old_tv.tv_usec;
389 if (optlen < sizeof(tv))
391 if (copy_from_sockptr(&tv, optval, sizeof(tv)))
394 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
398 static int warned __read_mostly;
401 if (warned < 10 && net_ratelimit()) {
403 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
404 __func__, current->comm, task_pid_nr(current));
408 *timeo_p = MAX_SCHEDULE_TIMEOUT;
409 if (tv.tv_sec == 0 && tv.tv_usec == 0)
411 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1))
412 *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP((unsigned long)tv.tv_usec, USEC_PER_SEC / HZ);
416 static bool sock_needs_netstamp(const struct sock *sk)
418 switch (sk->sk_family) {
427 static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
429 if (sk->sk_flags & flags) {
430 sk->sk_flags &= ~flags;
431 if (sock_needs_netstamp(sk) &&
432 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
433 net_disable_timestamp();
438 int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
441 struct sk_buff_head *list = &sk->sk_receive_queue;
443 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
444 atomic_inc(&sk->sk_drops);
445 trace_sock_rcvqueue_full(sk, skb);
449 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
450 atomic_inc(&sk->sk_drops);
455 skb_set_owner_r(skb, sk);
457 /* we escape from rcu protected region, make sure we dont leak
462 spin_lock_irqsave(&list->lock, flags);
463 sock_skb_set_dropcount(sk, skb);
464 __skb_queue_tail(list, skb);
465 spin_unlock_irqrestore(&list->lock, flags);
467 if (!sock_flag(sk, SOCK_DEAD))
468 sk->sk_data_ready(sk);
471 EXPORT_SYMBOL(__sock_queue_rcv_skb);
473 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
477 err = sk_filter(sk, skb);
481 return __sock_queue_rcv_skb(sk, skb);
483 EXPORT_SYMBOL(sock_queue_rcv_skb);
485 int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
486 const int nested, unsigned int trim_cap, bool refcounted)
488 int rc = NET_RX_SUCCESS;
490 if (sk_filter_trim_cap(sk, skb, trim_cap))
491 goto discard_and_relse;
495 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
496 atomic_inc(&sk->sk_drops);
497 goto discard_and_relse;
500 bh_lock_sock_nested(sk);
503 if (!sock_owned_by_user(sk)) {
505 * trylock + unlock semantics:
507 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
509 rc = sk_backlog_rcv(sk, skb);
511 mutex_release(&sk->sk_lock.dep_map, _RET_IP_);
512 } else if (sk_add_backlog(sk, skb, READ_ONCE(sk->sk_rcvbuf))) {
514 atomic_inc(&sk->sk_drops);
515 goto discard_and_relse;
527 EXPORT_SYMBOL(__sk_receive_skb);
529 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
531 struct dst_entry *dst = __sk_dst_get(sk);
533 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
534 sk_tx_queue_clear(sk);
535 sk->sk_dst_pending_confirm = 0;
536 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
543 EXPORT_SYMBOL(__sk_dst_check);
545 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
547 struct dst_entry *dst = sk_dst_get(sk);
549 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
557 EXPORT_SYMBOL(sk_dst_check);
559 static int sock_bindtoindex_locked(struct sock *sk, int ifindex)
561 int ret = -ENOPROTOOPT;
562 #ifdef CONFIG_NETDEVICES
563 struct net *net = sock_net(sk);
567 if (sk->sk_bound_dev_if && !ns_capable(net->user_ns, CAP_NET_RAW))
574 sk->sk_bound_dev_if = ifindex;
575 if (sk->sk_prot->rehash)
576 sk->sk_prot->rehash(sk);
587 int sock_bindtoindex(struct sock *sk, int ifindex, bool lock_sk)
593 ret = sock_bindtoindex_locked(sk, ifindex);
599 EXPORT_SYMBOL(sock_bindtoindex);
601 static int sock_setbindtodevice(struct sock *sk, sockptr_t optval, int optlen)
603 int ret = -ENOPROTOOPT;
604 #ifdef CONFIG_NETDEVICES
605 struct net *net = sock_net(sk);
606 char devname[IFNAMSIZ];
613 /* Bind this socket to a particular device like "eth0",
614 * as specified in the passed interface name. If the
615 * name is "" or the option length is zero the socket
618 if (optlen > IFNAMSIZ - 1)
619 optlen = IFNAMSIZ - 1;
620 memset(devname, 0, sizeof(devname));
623 if (copy_from_sockptr(devname, optval, optlen))
627 if (devname[0] != '\0') {
628 struct net_device *dev;
631 dev = dev_get_by_name_rcu(net, devname);
633 index = dev->ifindex;
640 return sock_bindtoindex(sk, index, true);
647 static int sock_getbindtodevice(struct sock *sk, char __user *optval,
648 int __user *optlen, int len)
650 int ret = -ENOPROTOOPT;
651 #ifdef CONFIG_NETDEVICES
652 struct net *net = sock_net(sk);
653 char devname[IFNAMSIZ];
655 if (sk->sk_bound_dev_if == 0) {
664 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
668 len = strlen(devname) + 1;
671 if (copy_to_user(optval, devname, len))
676 if (put_user(len, optlen))
687 bool sk_mc_loop(struct sock *sk)
689 if (dev_recursion_level())
693 switch (sk->sk_family) {
695 return inet_sk(sk)->mc_loop;
696 #if IS_ENABLED(CONFIG_IPV6)
698 return inet6_sk(sk)->mc_loop;
704 EXPORT_SYMBOL(sk_mc_loop);
706 void sock_set_reuseaddr(struct sock *sk)
709 sk->sk_reuse = SK_CAN_REUSE;
712 EXPORT_SYMBOL(sock_set_reuseaddr);
714 void sock_set_reuseport(struct sock *sk)
717 sk->sk_reuseport = true;
720 EXPORT_SYMBOL(sock_set_reuseport);
722 void sock_no_linger(struct sock *sk)
725 sk->sk_lingertime = 0;
726 sock_set_flag(sk, SOCK_LINGER);
729 EXPORT_SYMBOL(sock_no_linger);
731 void sock_set_priority(struct sock *sk, u32 priority)
734 sk->sk_priority = priority;
737 EXPORT_SYMBOL(sock_set_priority);
739 void sock_set_sndtimeo(struct sock *sk, s64 secs)
742 if (secs && secs < MAX_SCHEDULE_TIMEOUT / HZ - 1)
743 sk->sk_sndtimeo = secs * HZ;
745 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
748 EXPORT_SYMBOL(sock_set_sndtimeo);
750 static void __sock_set_timestamps(struct sock *sk, bool val, bool new, bool ns)
753 sock_valbool_flag(sk, SOCK_TSTAMP_NEW, new);
754 sock_valbool_flag(sk, SOCK_RCVTSTAMPNS, ns);
755 sock_set_flag(sk, SOCK_RCVTSTAMP);
756 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
758 sock_reset_flag(sk, SOCK_RCVTSTAMP);
759 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
763 void sock_enable_timestamps(struct sock *sk)
766 __sock_set_timestamps(sk, true, false, true);
769 EXPORT_SYMBOL(sock_enable_timestamps);
771 void sock_set_keepalive(struct sock *sk)
774 if (sk->sk_prot->keepalive)
775 sk->sk_prot->keepalive(sk, true);
776 sock_valbool_flag(sk, SOCK_KEEPOPEN, true);
779 EXPORT_SYMBOL(sock_set_keepalive);
781 static void __sock_set_rcvbuf(struct sock *sk, int val)
783 /* Ensure val * 2 fits into an int, to prevent max_t() from treating it
784 * as a negative value.
786 val = min_t(int, val, INT_MAX / 2);
787 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
789 /* We double it on the way in to account for "struct sk_buff" etc.
790 * overhead. Applications assume that the SO_RCVBUF setting they make
791 * will allow that much actual data to be received on that socket.
793 * Applications are unaware that "struct sk_buff" and other overheads
794 * allocate from the receive buffer during socket buffer allocation.
796 * And after considering the possible alternatives, returning the value
797 * we actually used in getsockopt is the most desirable behavior.
799 WRITE_ONCE(sk->sk_rcvbuf, max_t(int, val * 2, SOCK_MIN_RCVBUF));
802 void sock_set_rcvbuf(struct sock *sk, int val)
805 __sock_set_rcvbuf(sk, val);
808 EXPORT_SYMBOL(sock_set_rcvbuf);
810 static void __sock_set_mark(struct sock *sk, u32 val)
812 if (val != sk->sk_mark) {
818 void sock_set_mark(struct sock *sk, u32 val)
821 __sock_set_mark(sk, val);
824 EXPORT_SYMBOL(sock_set_mark);
827 * This is meant for all protocols to use and covers goings on
828 * at the socket level. Everything here is generic.
831 int sock_setsockopt(struct socket *sock, int level, int optname,
832 sockptr_t optval, unsigned int optlen)
834 struct sock_txtime sk_txtime;
835 struct sock *sk = sock->sk;
842 * Options without arguments
845 if (optname == SO_BINDTODEVICE)
846 return sock_setbindtodevice(sk, optval, optlen);
848 if (optlen < sizeof(int))
851 if (copy_from_sockptr(&val, optval, sizeof(val)))
854 valbool = val ? 1 : 0;
860 if (val && !capable(CAP_NET_ADMIN))
863 sock_valbool_flag(sk, SOCK_DBG, valbool);
866 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
869 sk->sk_reuseport = valbool;
878 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
882 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
885 /* Don't error on this BSD doesn't and if you think
886 * about it this is right. Otherwise apps have to
887 * play 'guess the biggest size' games. RCVBUF/SNDBUF
888 * are treated in BSD as hints
890 val = min_t(u32, val, READ_ONCE(sysctl_wmem_max));
892 /* Ensure val * 2 fits into an int, to prevent max_t()
893 * from treating it as a negative value.
895 val = min_t(int, val, INT_MAX / 2);
896 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
897 WRITE_ONCE(sk->sk_sndbuf,
898 max_t(int, val * 2, SOCK_MIN_SNDBUF));
899 /* Wake up sending tasks if we upped the value. */
900 sk->sk_write_space(sk);
904 if (!capable(CAP_NET_ADMIN)) {
909 /* No negative values (to prevent underflow, as val will be
917 /* Don't error on this BSD doesn't and if you think
918 * about it this is right. Otherwise apps have to
919 * play 'guess the biggest size' games. RCVBUF/SNDBUF
920 * are treated in BSD as hints
922 __sock_set_rcvbuf(sk, min_t(u32, val, READ_ONCE(sysctl_rmem_max)));
926 if (!capable(CAP_NET_ADMIN)) {
931 /* No negative values (to prevent underflow, as val will be
934 __sock_set_rcvbuf(sk, max(val, 0));
938 if (sk->sk_prot->keepalive)
939 sk->sk_prot->keepalive(sk, valbool);
940 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
944 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
948 sk->sk_no_check_tx = valbool;
952 if ((val >= 0 && val <= 6) ||
953 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
954 sk->sk_priority = val;
960 if (optlen < sizeof(ling)) {
961 ret = -EINVAL; /* 1003.1g */
964 if (copy_from_sockptr(&ling, optval, sizeof(ling))) {
969 sock_reset_flag(sk, SOCK_LINGER);
971 #if (BITS_PER_LONG == 32)
972 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
973 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
976 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
977 sock_set_flag(sk, SOCK_LINGER);
986 set_bit(SOCK_PASSCRED, &sock->flags);
988 clear_bit(SOCK_PASSCRED, &sock->flags);
991 case SO_TIMESTAMP_OLD:
992 __sock_set_timestamps(sk, valbool, false, false);
994 case SO_TIMESTAMP_NEW:
995 __sock_set_timestamps(sk, valbool, true, false);
997 case SO_TIMESTAMPNS_OLD:
998 __sock_set_timestamps(sk, valbool, false, true);
1000 case SO_TIMESTAMPNS_NEW:
1001 __sock_set_timestamps(sk, valbool, true, true);
1003 case SO_TIMESTAMPING_NEW:
1004 case SO_TIMESTAMPING_OLD:
1005 if (val & ~SOF_TIMESTAMPING_MASK) {
1010 if (val & SOF_TIMESTAMPING_OPT_ID &&
1011 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
1012 if (sk->sk_protocol == IPPROTO_TCP &&
1013 sk->sk_type == SOCK_STREAM) {
1014 if ((1 << sk->sk_state) &
1015 (TCPF_CLOSE | TCPF_LISTEN)) {
1019 sk->sk_tskey = tcp_sk(sk)->snd_una;
1025 if (val & SOF_TIMESTAMPING_OPT_STATS &&
1026 !(val & SOF_TIMESTAMPING_OPT_TSONLY)) {
1031 sk->sk_tsflags = val;
1032 sock_valbool_flag(sk, SOCK_TSTAMP_NEW, optname == SO_TIMESTAMPING_NEW);
1034 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
1035 sock_enable_timestamp(sk,
1036 SOCK_TIMESTAMPING_RX_SOFTWARE);
1038 sock_disable_timestamp(sk,
1039 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
1045 if (sock->ops->set_rcvlowat)
1046 ret = sock->ops->set_rcvlowat(sk, val);
1048 WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
1051 case SO_RCVTIMEO_OLD:
1052 case SO_RCVTIMEO_NEW:
1053 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval,
1054 optlen, optname == SO_RCVTIMEO_OLD);
1057 case SO_SNDTIMEO_OLD:
1058 case SO_SNDTIMEO_NEW:
1059 ret = sock_set_timeout(&sk->sk_sndtimeo, optval,
1060 optlen, optname == SO_SNDTIMEO_OLD);
1063 case SO_ATTACH_FILTER: {
1064 struct sock_fprog fprog;
1066 ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
1068 ret = sk_attach_filter(&fprog, sk);
1073 if (optlen == sizeof(u32)) {
1077 if (copy_from_sockptr(&ufd, optval, sizeof(ufd)))
1080 ret = sk_attach_bpf(ufd, sk);
1084 case SO_ATTACH_REUSEPORT_CBPF: {
1085 struct sock_fprog fprog;
1087 ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
1089 ret = sk_reuseport_attach_filter(&fprog, sk);
1092 case SO_ATTACH_REUSEPORT_EBPF:
1094 if (optlen == sizeof(u32)) {
1098 if (copy_from_sockptr(&ufd, optval, sizeof(ufd)))
1101 ret = sk_reuseport_attach_bpf(ufd, sk);
1105 case SO_DETACH_REUSEPORT_BPF:
1106 ret = reuseport_detach_prog(sk);
1109 case SO_DETACH_FILTER:
1110 ret = sk_detach_filter(sk);
1113 case SO_LOCK_FILTER:
1114 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
1117 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
1122 set_bit(SOCK_PASSSEC, &sock->flags);
1124 clear_bit(SOCK_PASSSEC, &sock->flags);
1127 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1132 __sock_set_mark(sk, val);
1136 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
1139 case SO_WIFI_STATUS:
1140 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
1144 if (sock->ops->set_peek_off)
1145 ret = sock->ops->set_peek_off(sk, val);
1151 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
1154 case SO_SELECT_ERR_QUEUE:
1155 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
1158 #ifdef CONFIG_NET_RX_BUSY_POLL
1160 /* allow unprivileged users to decrease the value */
1161 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
1167 WRITE_ONCE(sk->sk_ll_usec, val);
1172 case SO_MAX_PACING_RATE:
1174 unsigned long ulval = (val == ~0U) ? ~0UL : (unsigned int)val;
1176 if (sizeof(ulval) != sizeof(val) &&
1177 optlen >= sizeof(ulval) &&
1178 copy_from_sockptr(&ulval, optval, sizeof(ulval))) {
1183 cmpxchg(&sk->sk_pacing_status,
1186 sk->sk_max_pacing_rate = ulval;
1187 sk->sk_pacing_rate = min(sk->sk_pacing_rate, ulval);
1190 case SO_INCOMING_CPU:
1191 WRITE_ONCE(sk->sk_incoming_cpu, val);
1196 dst_negative_advice(sk);
1200 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) {
1201 if (!((sk->sk_type == SOCK_STREAM &&
1202 sk->sk_protocol == IPPROTO_TCP) ||
1203 (sk->sk_type == SOCK_DGRAM &&
1204 sk->sk_protocol == IPPROTO_UDP)))
1206 } else if (sk->sk_family != PF_RDS) {
1210 if (val < 0 || val > 1)
1213 sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool);
1218 if (optlen != sizeof(struct sock_txtime)) {
1221 } else if (copy_from_sockptr(&sk_txtime, optval,
1222 sizeof(struct sock_txtime))) {
1225 } else if (sk_txtime.flags & ~SOF_TXTIME_FLAGS_MASK) {
1229 /* CLOCK_MONOTONIC is only used by sch_fq, and this packet
1230 * scheduler has enough safe guards.
1232 if (sk_txtime.clockid != CLOCK_MONOTONIC &&
1233 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1237 sock_valbool_flag(sk, SOCK_TXTIME, true);
1238 sk->sk_clockid = sk_txtime.clockid;
1239 sk->sk_txtime_deadline_mode =
1240 !!(sk_txtime.flags & SOF_TXTIME_DEADLINE_MODE);
1241 sk->sk_txtime_report_errors =
1242 !!(sk_txtime.flags & SOF_TXTIME_REPORT_ERRORS);
1245 case SO_BINDTOIFINDEX:
1246 ret = sock_bindtoindex_locked(sk, val);
1256 EXPORT_SYMBOL(sock_setsockopt);
1258 static const struct cred *sk_get_peer_cred(struct sock *sk)
1260 const struct cred *cred;
1262 spin_lock(&sk->sk_peer_lock);
1263 cred = get_cred(sk->sk_peer_cred);
1264 spin_unlock(&sk->sk_peer_lock);
1269 static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1270 struct ucred *ucred)
1272 ucred->pid = pid_vnr(pid);
1273 ucred->uid = ucred->gid = -1;
1275 struct user_namespace *current_ns = current_user_ns();
1277 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1278 ucred->gid = from_kgid_munged(current_ns, cred->egid);
1282 static int groups_to_user(gid_t __user *dst, const struct group_info *src)
1284 struct user_namespace *user_ns = current_user_ns();
1287 for (i = 0; i < src->ngroups; i++)
1288 if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i))
1294 int sock_getsockopt(struct socket *sock, int level, int optname,
1295 char __user *optval, int __user *optlen)
1297 struct sock *sk = sock->sk;
1302 unsigned long ulval;
1304 struct old_timeval32 tm32;
1305 struct __kernel_old_timeval tm;
1306 struct __kernel_sock_timeval stm;
1307 struct sock_txtime txtime;
1310 int lv = sizeof(int);
1313 if (get_user(len, optlen))
1318 memset(&v, 0, sizeof(v));
1322 v.val = sock_flag(sk, SOCK_DBG);
1326 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1330 v.val = sock_flag(sk, SOCK_BROADCAST);
1334 v.val = sk->sk_sndbuf;
1338 v.val = sk->sk_rcvbuf;
1342 v.val = sk->sk_reuse;
1346 v.val = sk->sk_reuseport;
1350 v.val = sock_flag(sk, SOCK_KEEPOPEN);
1354 v.val = sk->sk_type;
1358 v.val = sk->sk_protocol;
1362 v.val = sk->sk_family;
1366 v.val = -sock_error(sk);
1368 v.val = xchg(&sk->sk_err_soft, 0);
1372 v.val = sock_flag(sk, SOCK_URGINLINE);
1376 v.val = sk->sk_no_check_tx;
1380 v.val = sk->sk_priority;
1384 lv = sizeof(v.ling);
1385 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
1386 v.ling.l_linger = sk->sk_lingertime / HZ;
1392 case SO_TIMESTAMP_OLD:
1393 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1394 !sock_flag(sk, SOCK_TSTAMP_NEW) &&
1395 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1398 case SO_TIMESTAMPNS_OLD:
1399 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && !sock_flag(sk, SOCK_TSTAMP_NEW);
1402 case SO_TIMESTAMP_NEW:
1403 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && sock_flag(sk, SOCK_TSTAMP_NEW);
1406 case SO_TIMESTAMPNS_NEW:
1407 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && sock_flag(sk, SOCK_TSTAMP_NEW);
1410 case SO_TIMESTAMPING_OLD:
1411 v.val = sk->sk_tsflags;
1414 case SO_RCVTIMEO_OLD:
1415 case SO_RCVTIMEO_NEW:
1416 lv = sock_get_timeout(sk->sk_rcvtimeo, &v, SO_RCVTIMEO_OLD == optname);
1419 case SO_SNDTIMEO_OLD:
1420 case SO_SNDTIMEO_NEW:
1421 lv = sock_get_timeout(sk->sk_sndtimeo, &v, SO_SNDTIMEO_OLD == optname);
1425 v.val = sk->sk_rcvlowat;
1433 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1438 struct ucred peercred;
1439 if (len > sizeof(peercred))
1440 len = sizeof(peercred);
1442 spin_lock(&sk->sk_peer_lock);
1443 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1444 spin_unlock(&sk->sk_peer_lock);
1446 if (copy_to_user(optval, &peercred, len))
1453 const struct cred *cred;
1456 cred = sk_get_peer_cred(sk);
1460 n = cred->group_info->ngroups;
1461 if (len < n * sizeof(gid_t)) {
1462 len = n * sizeof(gid_t);
1464 return put_user(len, optlen) ? -EFAULT : -ERANGE;
1466 len = n * sizeof(gid_t);
1468 ret = groups_to_user((gid_t __user *)optval, cred->group_info);
1479 lv = sock->ops->getname(sock, (struct sockaddr *)address, 2);
1484 if (copy_to_user(optval, address, len))
1489 /* Dubious BSD thing... Probably nobody even uses it, but
1490 * the UNIX standard wants it for whatever reason... -DaveM
1493 v.val = sk->sk_state == TCP_LISTEN;
1497 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1501 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1504 v.val = sk->sk_mark;
1508 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1511 case SO_WIFI_STATUS:
1512 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1516 if (!sock->ops->set_peek_off)
1519 v.val = sk->sk_peek_off;
1522 v.val = sock_flag(sk, SOCK_NOFCS);
1525 case SO_BINDTODEVICE:
1526 return sock_getbindtodevice(sk, optval, optlen, len);
1529 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1535 case SO_LOCK_FILTER:
1536 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1539 case SO_BPF_EXTENSIONS:
1540 v.val = bpf_tell_extensions();
1543 case SO_SELECT_ERR_QUEUE:
1544 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1547 #ifdef CONFIG_NET_RX_BUSY_POLL
1549 v.val = sk->sk_ll_usec;
1553 case SO_MAX_PACING_RATE:
1554 if (sizeof(v.ulval) != sizeof(v.val) && len >= sizeof(v.ulval)) {
1555 lv = sizeof(v.ulval);
1556 v.ulval = sk->sk_max_pacing_rate;
1559 v.val = min_t(unsigned long, sk->sk_max_pacing_rate, ~0U);
1563 case SO_INCOMING_CPU:
1564 v.val = READ_ONCE(sk->sk_incoming_cpu);
1569 u32 meminfo[SK_MEMINFO_VARS];
1571 sk_get_meminfo(sk, meminfo);
1573 len = min_t(unsigned int, len, sizeof(meminfo));
1574 if (copy_to_user(optval, &meminfo, len))
1580 #ifdef CONFIG_NET_RX_BUSY_POLL
1581 case SO_INCOMING_NAPI_ID:
1582 v.val = READ_ONCE(sk->sk_napi_id);
1584 /* aggregate non-NAPI IDs down to 0 */
1585 if (v.val < MIN_NAPI_ID)
1595 v.val64 = sock_gen_cookie(sk);
1599 v.val = sock_flag(sk, SOCK_ZEROCOPY);
1603 lv = sizeof(v.txtime);
1604 v.txtime.clockid = sk->sk_clockid;
1605 v.txtime.flags |= sk->sk_txtime_deadline_mode ?
1606 SOF_TXTIME_DEADLINE_MODE : 0;
1607 v.txtime.flags |= sk->sk_txtime_report_errors ?
1608 SOF_TXTIME_REPORT_ERRORS : 0;
1611 case SO_BINDTOIFINDEX:
1612 v.val = sk->sk_bound_dev_if;
1616 /* We implement the SO_SNDLOWAT etc to not be settable
1619 return -ENOPROTOOPT;
1624 if (copy_to_user(optval, &v, len))
1627 if (put_user(len, optlen))
1633 * Initialize an sk_lock.
1635 * (We also register the sk_lock with the lock validator.)
1637 static inline void sock_lock_init(struct sock *sk)
1639 if (sk->sk_kern_sock)
1640 sock_lock_init_class_and_name(
1642 af_family_kern_slock_key_strings[sk->sk_family],
1643 af_family_kern_slock_keys + sk->sk_family,
1644 af_family_kern_key_strings[sk->sk_family],
1645 af_family_kern_keys + sk->sk_family);
1647 sock_lock_init_class_and_name(
1649 af_family_slock_key_strings[sk->sk_family],
1650 af_family_slock_keys + sk->sk_family,
1651 af_family_key_strings[sk->sk_family],
1652 af_family_keys + sk->sk_family);
1656 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1657 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1658 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1660 static void sock_copy(struct sock *nsk, const struct sock *osk)
1662 const struct proto *prot = READ_ONCE(osk->sk_prot);
1663 #ifdef CONFIG_SECURITY_NETWORK
1664 void *sptr = nsk->sk_security;
1666 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1668 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1669 prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1671 #ifdef CONFIG_SECURITY_NETWORK
1672 nsk->sk_security = sptr;
1673 security_sk_clone(osk, nsk);
1677 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1681 struct kmem_cache *slab;
1685 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1688 if (want_init_on_alloc(priority))
1689 sk_prot_clear_nulls(sk, prot->obj_size);
1691 sk = kmalloc(prot->obj_size, priority);
1694 if (security_sk_alloc(sk, family, priority))
1697 if (!try_module_get(prot->owner))
1699 sk_tx_queue_clear(sk);
1705 security_sk_free(sk);
1708 kmem_cache_free(slab, sk);
1714 static void sk_prot_free(struct proto *prot, struct sock *sk)
1716 struct kmem_cache *slab;
1717 struct module *owner;
1719 owner = prot->owner;
1722 cgroup_sk_free(&sk->sk_cgrp_data);
1723 mem_cgroup_sk_free(sk);
1724 security_sk_free(sk);
1726 kmem_cache_free(slab, sk);
1733 * sk_alloc - All socket objects are allocated here
1734 * @net: the applicable net namespace
1735 * @family: protocol family
1736 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1737 * @prot: struct proto associated with this new sock instance
1738 * @kern: is this to be a kernel socket?
1740 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1741 struct proto *prot, int kern)
1745 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1747 sk->sk_family = family;
1749 * See comment in struct sock definition to understand
1750 * why we need sk_prot_creator -acme
1752 sk->sk_prot = sk->sk_prot_creator = prot;
1753 sk->sk_kern_sock = kern;
1755 sk->sk_net_refcnt = kern ? 0 : 1;
1756 if (likely(sk->sk_net_refcnt)) {
1758 sock_inuse_add(net, 1);
1761 sock_net_set(sk, net);
1762 refcount_set(&sk->sk_wmem_alloc, 1);
1764 mem_cgroup_sk_alloc(sk);
1765 cgroup_sk_alloc(&sk->sk_cgrp_data);
1766 sock_update_classid(&sk->sk_cgrp_data);
1767 sock_update_netprioidx(&sk->sk_cgrp_data);
1768 sk_tx_queue_clear(sk);
1773 EXPORT_SYMBOL(sk_alloc);
1775 /* Sockets having SOCK_RCU_FREE will call this function after one RCU
1776 * grace period. This is the case for UDP sockets and TCP listeners.
1778 static void __sk_destruct(struct rcu_head *head)
1780 struct sock *sk = container_of(head, struct sock, sk_rcu);
1781 struct sk_filter *filter;
1783 if (sk->sk_destruct)
1784 sk->sk_destruct(sk);
1786 filter = rcu_dereference_check(sk->sk_filter,
1787 refcount_read(&sk->sk_wmem_alloc) == 0);
1789 sk_filter_uncharge(sk, filter);
1790 RCU_INIT_POINTER(sk->sk_filter, NULL);
1793 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1795 #ifdef CONFIG_BPF_SYSCALL
1796 bpf_sk_storage_free(sk);
1799 if (atomic_read(&sk->sk_omem_alloc))
1800 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1801 __func__, atomic_read(&sk->sk_omem_alloc));
1803 if (sk->sk_frag.page) {
1804 put_page(sk->sk_frag.page);
1805 sk->sk_frag.page = NULL;
1808 /* We do not need to acquire sk->sk_peer_lock, we are the last user. */
1809 put_cred(sk->sk_peer_cred);
1810 put_pid(sk->sk_peer_pid);
1812 if (likely(sk->sk_net_refcnt))
1813 put_net(sock_net(sk));
1814 sk_prot_free(sk->sk_prot_creator, sk);
1817 void sk_destruct(struct sock *sk)
1819 bool use_call_rcu = sock_flag(sk, SOCK_RCU_FREE);
1821 if (rcu_access_pointer(sk->sk_reuseport_cb)) {
1822 reuseport_detach_sock(sk);
1823 use_call_rcu = true;
1827 call_rcu(&sk->sk_rcu, __sk_destruct);
1829 __sk_destruct(&sk->sk_rcu);
1832 static void __sk_free(struct sock *sk)
1834 if (likely(sk->sk_net_refcnt))
1835 sock_inuse_add(sock_net(sk), -1);
1837 if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk)))
1838 sock_diag_broadcast_destroy(sk);
1843 void sk_free(struct sock *sk)
1846 * We subtract one from sk_wmem_alloc and can know if
1847 * some packets are still in some tx queue.
1848 * If not null, sock_wfree() will call __sk_free(sk) later
1850 if (refcount_dec_and_test(&sk->sk_wmem_alloc))
1853 EXPORT_SYMBOL(sk_free);
1855 static void sk_init_common(struct sock *sk)
1857 skb_queue_head_init(&sk->sk_receive_queue);
1858 skb_queue_head_init(&sk->sk_write_queue);
1859 skb_queue_head_init(&sk->sk_error_queue);
1861 rwlock_init(&sk->sk_callback_lock);
1862 lockdep_set_class_and_name(&sk->sk_receive_queue.lock,
1863 af_rlock_keys + sk->sk_family,
1864 af_family_rlock_key_strings[sk->sk_family]);
1865 lockdep_set_class_and_name(&sk->sk_write_queue.lock,
1866 af_wlock_keys + sk->sk_family,
1867 af_family_wlock_key_strings[sk->sk_family]);
1868 lockdep_set_class_and_name(&sk->sk_error_queue.lock,
1869 af_elock_keys + sk->sk_family,
1870 af_family_elock_key_strings[sk->sk_family]);
1871 lockdep_set_class_and_name(&sk->sk_callback_lock,
1872 af_callback_keys + sk->sk_family,
1873 af_family_clock_key_strings[sk->sk_family]);
1877 * sk_clone_lock - clone a socket, and lock its clone
1878 * @sk: the socket to clone
1879 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1881 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1883 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1885 struct proto *prot = READ_ONCE(sk->sk_prot);
1886 struct sk_filter *filter;
1887 bool is_charged = true;
1890 newsk = sk_prot_alloc(prot, priority, sk->sk_family);
1894 sock_copy(newsk, sk);
1896 newsk->sk_prot_creator = prot;
1899 if (likely(newsk->sk_net_refcnt)) {
1900 get_net(sock_net(newsk));
1901 sock_inuse_add(sock_net(newsk), 1);
1903 sk_node_init(&newsk->sk_node);
1904 sock_lock_init(newsk);
1905 bh_lock_sock(newsk);
1906 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1907 newsk->sk_backlog.len = 0;
1909 atomic_set(&newsk->sk_rmem_alloc, 0);
1911 /* sk_wmem_alloc set to one (see sk_free() and sock_wfree()) */
1912 refcount_set(&newsk->sk_wmem_alloc, 1);
1914 atomic_set(&newsk->sk_omem_alloc, 0);
1915 sk_init_common(newsk);
1917 newsk->sk_dst_cache = NULL;
1918 newsk->sk_dst_pending_confirm = 0;
1919 newsk->sk_wmem_queued = 0;
1920 newsk->sk_forward_alloc = 0;
1921 atomic_set(&newsk->sk_drops, 0);
1922 newsk->sk_send_head = NULL;
1923 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1924 atomic_set(&newsk->sk_zckey, 0);
1926 sock_reset_flag(newsk, SOCK_DONE);
1928 /* sk->sk_memcg will be populated at accept() time */
1929 newsk->sk_memcg = NULL;
1931 cgroup_sk_clone(&newsk->sk_cgrp_data);
1934 filter = rcu_dereference(sk->sk_filter);
1936 /* though it's an empty new sock, the charging may fail
1937 * if sysctl_optmem_max was changed between creation of
1938 * original socket and cloning
1940 is_charged = sk_filter_charge(newsk, filter);
1941 RCU_INIT_POINTER(newsk->sk_filter, filter);
1944 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
1945 /* We need to make sure that we don't uncharge the new
1946 * socket if we couldn't charge it in the first place
1947 * as otherwise we uncharge the parent's filter.
1950 RCU_INIT_POINTER(newsk->sk_filter, NULL);
1951 sk_free_unlock_clone(newsk);
1955 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
1957 if (bpf_sk_storage_clone(sk, newsk)) {
1958 sk_free_unlock_clone(newsk);
1963 /* Clear sk_user_data if parent had the pointer tagged
1964 * as not suitable for copying when cloning.
1966 if (sk_user_data_is_nocopy(newsk))
1967 newsk->sk_user_data = NULL;
1970 newsk->sk_err_soft = 0;
1971 newsk->sk_priority = 0;
1972 newsk->sk_incoming_cpu = raw_smp_processor_id();
1974 /* Before updating sk_refcnt, we must commit prior changes to memory
1975 * (Documentation/RCU/rculist_nulls.rst for details)
1978 refcount_set(&newsk->sk_refcnt, 2);
1980 /* Increment the counter in the same struct proto as the master
1981 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1982 * is the same as sk->sk_prot->socks, as this field was copied
1985 * This _changes_ the previous behaviour, where
1986 * tcp_create_openreq_child always was incrementing the
1987 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1988 * to be taken into account in all callers. -acme
1990 sk_refcnt_debug_inc(newsk);
1991 sk_set_socket(newsk, NULL);
1992 sk_tx_queue_clear(newsk);
1993 RCU_INIT_POINTER(newsk->sk_wq, NULL);
1995 if (newsk->sk_prot->sockets_allocated)
1996 sk_sockets_allocated_inc(newsk);
1998 if (sock_needs_netstamp(sk) && newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1999 net_enable_timestamp();
2003 EXPORT_SYMBOL_GPL(sk_clone_lock);
2005 void sk_free_unlock_clone(struct sock *sk)
2007 /* It is still raw copy of parent, so invalidate
2008 * destructor and make plain sk_free() */
2009 sk->sk_destruct = NULL;
2013 EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
2015 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
2019 sk_dst_set(sk, dst);
2020 sk->sk_route_caps = dst->dev->features | sk->sk_route_forced_caps;
2021 if (sk->sk_route_caps & NETIF_F_GSO)
2022 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
2023 sk->sk_route_caps &= ~sk->sk_route_nocaps;
2024 if (sk_can_gso(sk)) {
2025 if (dst->header_len && !xfrm_dst_offload_ok(dst)) {
2026 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
2028 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
2029 sk->sk_gso_max_size = dst->dev->gso_max_size;
2030 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
2033 sk->sk_gso_max_segs = max_segs;
2035 EXPORT_SYMBOL_GPL(sk_setup_caps);
2038 * Simple resource managers for sockets.
2043 * Write buffer destructor automatically called from kfree_skb.
2045 void sock_wfree(struct sk_buff *skb)
2047 struct sock *sk = skb->sk;
2048 unsigned int len = skb->truesize;
2050 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
2052 * Keep a reference on sk_wmem_alloc, this will be released
2053 * after sk_write_space() call
2055 WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc));
2056 sk->sk_write_space(sk);
2060 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
2061 * could not do because of in-flight packets
2063 if (refcount_sub_and_test(len, &sk->sk_wmem_alloc))
2066 EXPORT_SYMBOL(sock_wfree);
2068 /* This variant of sock_wfree() is used by TCP,
2069 * since it sets SOCK_USE_WRITE_QUEUE.
2071 void __sock_wfree(struct sk_buff *skb)
2073 struct sock *sk = skb->sk;
2075 if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
2079 void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
2084 if (unlikely(!sk_fullsock(sk))) {
2085 skb->destructor = sock_edemux;
2090 skb->destructor = sock_wfree;
2091 skb_set_hash_from_sk(skb, sk);
2093 * We used to take a refcount on sk, but following operation
2094 * is enough to guarantee sk_free() wont free this sock until
2095 * all in-flight packets are completed
2097 refcount_add(skb->truesize, &sk->sk_wmem_alloc);
2099 EXPORT_SYMBOL(skb_set_owner_w);
2101 static bool can_skb_orphan_partial(const struct sk_buff *skb)
2103 #ifdef CONFIG_TLS_DEVICE
2104 /* Drivers depend on in-order delivery for crypto offload,
2105 * partial orphan breaks out-of-order-OK logic.
2110 return (skb->destructor == sock_wfree ||
2111 (IS_ENABLED(CONFIG_INET) && skb->destructor == tcp_wfree));
2114 /* This helper is used by netem, as it can hold packets in its
2115 * delay queue. We want to allow the owner socket to send more
2116 * packets, as if they were already TX completed by a typical driver.
2117 * But we also want to keep skb->sk set because some packet schedulers
2118 * rely on it (sch_fq for example).
2120 void skb_orphan_partial(struct sk_buff *skb)
2122 if (skb_is_tcp_pure_ack(skb))
2125 if (can_skb_orphan_partial(skb) && skb_set_owner_sk_safe(skb, skb->sk))
2130 EXPORT_SYMBOL(skb_orphan_partial);
2133 * Read buffer destructor automatically called from kfree_skb.
2135 void sock_rfree(struct sk_buff *skb)
2137 struct sock *sk = skb->sk;
2138 unsigned int len = skb->truesize;
2140 atomic_sub(len, &sk->sk_rmem_alloc);
2141 sk_mem_uncharge(sk, len);
2143 EXPORT_SYMBOL(sock_rfree);
2146 * Buffer destructor for skbs that are not used directly in read or write
2147 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
2149 void sock_efree(struct sk_buff *skb)
2153 EXPORT_SYMBOL(sock_efree);
2155 /* Buffer destructor for prefetch/receive path where reference count may
2156 * not be held, e.g. for listen sockets.
2159 void sock_pfree(struct sk_buff *skb)
2161 if (sk_is_refcounted(skb->sk))
2162 sock_gen_put(skb->sk);
2164 EXPORT_SYMBOL(sock_pfree);
2165 #endif /* CONFIG_INET */
2167 kuid_t sock_i_uid(struct sock *sk)
2171 read_lock_bh(&sk->sk_callback_lock);
2172 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
2173 read_unlock_bh(&sk->sk_callback_lock);
2176 EXPORT_SYMBOL(sock_i_uid);
2178 unsigned long sock_i_ino(struct sock *sk)
2182 read_lock_bh(&sk->sk_callback_lock);
2183 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
2184 read_unlock_bh(&sk->sk_callback_lock);
2187 EXPORT_SYMBOL(sock_i_ino);
2190 * Allocate a skb from the socket's send buffer.
2192 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
2196 refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf)) {
2197 struct sk_buff *skb = alloc_skb(size, priority);
2200 skb_set_owner_w(skb, sk);
2206 EXPORT_SYMBOL(sock_wmalloc);
2208 static void sock_ofree(struct sk_buff *skb)
2210 struct sock *sk = skb->sk;
2212 atomic_sub(skb->truesize, &sk->sk_omem_alloc);
2215 struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size,
2218 struct sk_buff *skb;
2220 /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */
2221 if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) >
2222 READ_ONCE(sysctl_optmem_max))
2225 skb = alloc_skb(size, priority);
2229 atomic_add(skb->truesize, &sk->sk_omem_alloc);
2231 skb->destructor = sock_ofree;
2236 * Allocate a memory block from the socket's option memory buffer.
2238 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
2240 int optmem_max = READ_ONCE(sysctl_optmem_max);
2242 if ((unsigned int)size <= optmem_max &&
2243 atomic_read(&sk->sk_omem_alloc) + size < optmem_max) {
2245 /* First do the add, to avoid the race if kmalloc
2248 atomic_add(size, &sk->sk_omem_alloc);
2249 mem = kmalloc(size, priority);
2252 atomic_sub(size, &sk->sk_omem_alloc);
2256 EXPORT_SYMBOL(sock_kmalloc);
2258 /* Free an option memory block. Note, we actually want the inline
2259 * here as this allows gcc to detect the nullify and fold away the
2260 * condition entirely.
2262 static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
2265 if (WARN_ON_ONCE(!mem))
2268 kfree_sensitive(mem);
2271 atomic_sub(size, &sk->sk_omem_alloc);
2274 void sock_kfree_s(struct sock *sk, void *mem, int size)
2276 __sock_kfree_s(sk, mem, size, false);
2278 EXPORT_SYMBOL(sock_kfree_s);
2280 void sock_kzfree_s(struct sock *sk, void *mem, int size)
2282 __sock_kfree_s(sk, mem, size, true);
2284 EXPORT_SYMBOL(sock_kzfree_s);
2286 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
2287 I think, these locks should be removed for datagram sockets.
2289 static long sock_wait_for_wmem(struct sock *sk, long timeo)
2293 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2297 if (signal_pending(current))
2299 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2300 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2301 if (refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf))
2303 if (sk->sk_shutdown & SEND_SHUTDOWN)
2307 timeo = schedule_timeout(timeo);
2309 finish_wait(sk_sleep(sk), &wait);
2315 * Generic send/receive buffer handlers
2318 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
2319 unsigned long data_len, int noblock,
2320 int *errcode, int max_page_order)
2322 struct sk_buff *skb;
2326 timeo = sock_sndtimeo(sk, noblock);
2328 err = sock_error(sk);
2333 if (sk->sk_shutdown & SEND_SHUTDOWN)
2336 if (sk_wmem_alloc_get(sk) < READ_ONCE(sk->sk_sndbuf))
2339 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2340 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2344 if (signal_pending(current))
2346 timeo = sock_wait_for_wmem(sk, timeo);
2348 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
2349 errcode, sk->sk_allocation);
2351 skb_set_owner_w(skb, sk);
2355 err = sock_intr_errno(timeo);
2360 EXPORT_SYMBOL(sock_alloc_send_pskb);
2362 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
2363 int noblock, int *errcode)
2365 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
2367 EXPORT_SYMBOL(sock_alloc_send_skb);
2369 int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
2370 struct sockcm_cookie *sockc)
2374 switch (cmsg->cmsg_type) {
2376 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2378 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2380 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
2382 case SO_TIMESTAMPING_OLD:
2383 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2386 tsflags = *(u32 *)CMSG_DATA(cmsg);
2387 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
2390 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
2391 sockc->tsflags |= tsflags;
2394 if (!sock_flag(sk, SOCK_TXTIME))
2396 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u64)))
2398 sockc->transmit_time = get_unaligned((u64 *)CMSG_DATA(cmsg));
2400 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
2402 case SCM_CREDENTIALS:
2409 EXPORT_SYMBOL(__sock_cmsg_send);
2411 int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
2412 struct sockcm_cookie *sockc)
2414 struct cmsghdr *cmsg;
2417 for_each_cmsghdr(cmsg, msg) {
2418 if (!CMSG_OK(msg, cmsg))
2420 if (cmsg->cmsg_level != SOL_SOCKET)
2422 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
2428 EXPORT_SYMBOL(sock_cmsg_send);
2430 static void sk_enter_memory_pressure(struct sock *sk)
2432 if (!sk->sk_prot->enter_memory_pressure)
2435 sk->sk_prot->enter_memory_pressure(sk);
2438 static void sk_leave_memory_pressure(struct sock *sk)
2440 if (sk->sk_prot->leave_memory_pressure) {
2441 sk->sk_prot->leave_memory_pressure(sk);
2443 unsigned long *memory_pressure = sk->sk_prot->memory_pressure;
2445 if (memory_pressure && READ_ONCE(*memory_pressure))
2446 WRITE_ONCE(*memory_pressure, 0);
2450 #define SKB_FRAG_PAGE_ORDER get_order(32768)
2451 DEFINE_STATIC_KEY_FALSE(net_high_order_alloc_disable_key);
2454 * skb_page_frag_refill - check that a page_frag contains enough room
2455 * @sz: minimum size of the fragment we want to get
2456 * @pfrag: pointer to page_frag
2457 * @gfp: priority for memory allocation
2459 * Note: While this allocator tries to use high order pages, there is
2460 * no guarantee that allocations succeed. Therefore, @sz MUST be
2461 * less or equal than PAGE_SIZE.
2463 bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
2466 if (page_ref_count(pfrag->page) == 1) {
2470 if (pfrag->offset + sz <= pfrag->size)
2472 put_page(pfrag->page);
2476 if (SKB_FRAG_PAGE_ORDER &&
2477 !static_branch_unlikely(&net_high_order_alloc_disable_key)) {
2478 /* Avoid direct reclaim but allow kswapd to wake */
2479 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
2480 __GFP_COMP | __GFP_NOWARN |
2482 SKB_FRAG_PAGE_ORDER);
2483 if (likely(pfrag->page)) {
2484 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
2488 pfrag->page = alloc_page(gfp);
2489 if (likely(pfrag->page)) {
2490 pfrag->size = PAGE_SIZE;
2495 EXPORT_SYMBOL(skb_page_frag_refill);
2497 bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2499 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2502 sk_enter_memory_pressure(sk);
2503 sk_stream_moderate_sndbuf(sk);
2506 EXPORT_SYMBOL(sk_page_frag_refill);
2508 static void __lock_sock(struct sock *sk)
2509 __releases(&sk->sk_lock.slock)
2510 __acquires(&sk->sk_lock.slock)
2515 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2516 TASK_UNINTERRUPTIBLE);
2517 spin_unlock_bh(&sk->sk_lock.slock);
2519 spin_lock_bh(&sk->sk_lock.slock);
2520 if (!sock_owned_by_user(sk))
2523 finish_wait(&sk->sk_lock.wq, &wait);
2526 void __release_sock(struct sock *sk)
2527 __releases(&sk->sk_lock.slock)
2528 __acquires(&sk->sk_lock.slock)
2530 struct sk_buff *skb, *next;
2532 while ((skb = sk->sk_backlog.head) != NULL) {
2533 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
2535 spin_unlock_bh(&sk->sk_lock.slock);
2540 WARN_ON_ONCE(skb_dst_is_noref(skb));
2541 skb_mark_not_on_list(skb);
2542 sk_backlog_rcv(sk, skb);
2547 } while (skb != NULL);
2549 spin_lock_bh(&sk->sk_lock.slock);
2553 * Doing the zeroing here guarantee we can not loop forever
2554 * while a wild producer attempts to flood us.
2556 sk->sk_backlog.len = 0;
2559 void __sk_flush_backlog(struct sock *sk)
2561 spin_lock_bh(&sk->sk_lock.slock);
2563 spin_unlock_bh(&sk->sk_lock.slock);
2567 * sk_wait_data - wait for data to arrive at sk_receive_queue
2568 * @sk: sock to wait on
2569 * @timeo: for how long
2570 * @skb: last skb seen on sk_receive_queue
2572 * Now socket state including sk->sk_err is changed only under lock,
2573 * hence we may omit checks after joining wait queue.
2574 * We check receive queue before schedule() only as optimization;
2575 * it is very likely that release_sock() added new data.
2577 int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
2579 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2582 add_wait_queue(sk_sleep(sk), &wait);
2583 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2584 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
2585 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2586 remove_wait_queue(sk_sleep(sk), &wait);
2589 EXPORT_SYMBOL(sk_wait_data);
2592 * __sk_mem_raise_allocated - increase memory_allocated
2594 * @size: memory size to allocate
2595 * @amt: pages to allocate
2596 * @kind: allocation type
2598 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc
2600 int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
2602 struct proto *prot = sk->sk_prot;
2603 long allocated = sk_memory_allocated_add(sk, amt);
2604 bool charged = true;
2606 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2607 !(charged = mem_cgroup_charge_skmem(sk->sk_memcg, amt)))
2608 goto suppress_allocation;
2611 if (allocated <= sk_prot_mem_limits(sk, 0)) {
2612 sk_leave_memory_pressure(sk);
2616 /* Under pressure. */
2617 if (allocated > sk_prot_mem_limits(sk, 1))
2618 sk_enter_memory_pressure(sk);
2620 /* Over hard limit. */
2621 if (allocated > sk_prot_mem_limits(sk, 2))
2622 goto suppress_allocation;
2624 /* guarantee minimum buffer size under pressure */
2625 if (kind == SK_MEM_RECV) {
2626 if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot))
2629 } else { /* SK_MEM_SEND */
2630 int wmem0 = sk_get_wmem0(sk, prot);
2632 if (sk->sk_type == SOCK_STREAM) {
2633 if (sk->sk_wmem_queued < wmem0)
2635 } else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) {
2640 if (sk_has_memory_pressure(sk)) {
2643 if (!sk_under_memory_pressure(sk))
2645 alloc = sk_sockets_allocated_read_positive(sk);
2646 if (sk_prot_mem_limits(sk, 2) > alloc *
2647 sk_mem_pages(sk->sk_wmem_queued +
2648 atomic_read(&sk->sk_rmem_alloc) +
2649 sk->sk_forward_alloc))
2653 suppress_allocation:
2655 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2656 sk_stream_moderate_sndbuf(sk);
2658 /* Fail only if socket is _under_ its sndbuf.
2659 * In this case we cannot block, so that we have to fail.
2661 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2665 if (kind == SK_MEM_SEND || (kind == SK_MEM_RECV && charged))
2666 trace_sock_exceed_buf_limit(sk, prot, allocated, kind);
2668 sk_memory_allocated_sub(sk, amt);
2670 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2671 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
2675 EXPORT_SYMBOL(__sk_mem_raise_allocated);
2678 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2680 * @size: memory size to allocate
2681 * @kind: allocation type
2683 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2684 * rmem allocation. This function assumes that protocols which have
2685 * memory_pressure use sk_wmem_queued as write buffer accounting.
2687 int __sk_mem_schedule(struct sock *sk, int size, int kind)
2689 int ret, amt = sk_mem_pages(size);
2691 sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT;
2692 ret = __sk_mem_raise_allocated(sk, size, amt, kind);
2694 sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT;
2697 EXPORT_SYMBOL(__sk_mem_schedule);
2700 * __sk_mem_reduce_allocated - reclaim memory_allocated
2702 * @amount: number of quanta
2704 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
2706 void __sk_mem_reduce_allocated(struct sock *sk, int amount)
2708 sk_memory_allocated_sub(sk, amount);
2710 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2711 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
2713 if (sk_under_memory_pressure(sk) &&
2714 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2715 sk_leave_memory_pressure(sk);
2717 EXPORT_SYMBOL(__sk_mem_reduce_allocated);
2720 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
2722 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
2724 void __sk_mem_reclaim(struct sock *sk, int amount)
2726 amount >>= SK_MEM_QUANTUM_SHIFT;
2727 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
2728 __sk_mem_reduce_allocated(sk, amount);
2730 EXPORT_SYMBOL(__sk_mem_reclaim);
2732 int sk_set_peek_off(struct sock *sk, int val)
2734 sk->sk_peek_off = val;
2737 EXPORT_SYMBOL_GPL(sk_set_peek_off);
2740 * Set of default routines for initialising struct proto_ops when
2741 * the protocol does not support a particular function. In certain
2742 * cases where it makes no sense for a protocol to have a "do nothing"
2743 * function, some default processing is provided.
2746 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2750 EXPORT_SYMBOL(sock_no_bind);
2752 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
2757 EXPORT_SYMBOL(sock_no_connect);
2759 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2763 EXPORT_SYMBOL(sock_no_socketpair);
2765 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags,
2770 EXPORT_SYMBOL(sock_no_accept);
2772 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
2777 EXPORT_SYMBOL(sock_no_getname);
2779 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2783 EXPORT_SYMBOL(sock_no_ioctl);
2785 int sock_no_listen(struct socket *sock, int backlog)
2789 EXPORT_SYMBOL(sock_no_listen);
2791 int sock_no_shutdown(struct socket *sock, int how)
2795 EXPORT_SYMBOL(sock_no_shutdown);
2797 int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
2801 EXPORT_SYMBOL(sock_no_sendmsg);
2803 int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len)
2807 EXPORT_SYMBOL(sock_no_sendmsg_locked);
2809 int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2814 EXPORT_SYMBOL(sock_no_recvmsg);
2816 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2818 /* Mirror missing mmap method error code */
2821 EXPORT_SYMBOL(sock_no_mmap);
2824 * When a file is received (via SCM_RIGHTS, etc), we must bump the
2825 * various sock-based usage counts.
2827 void __receive_sock(struct file *file)
2829 struct socket *sock;
2833 * The resulting value of "error" is ignored here since we only
2834 * need to take action when the file is a socket and testing
2835 * "sock" for NULL is sufficient.
2837 sock = sock_from_file(file, &error);
2839 sock_update_netprioidx(&sock->sk->sk_cgrp_data);
2840 sock_update_classid(&sock->sk->sk_cgrp_data);
2844 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2847 struct msghdr msg = {.msg_flags = flags};
2849 char *kaddr = kmap(page);
2850 iov.iov_base = kaddr + offset;
2852 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2856 EXPORT_SYMBOL(sock_no_sendpage);
2858 ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page,
2859 int offset, size_t size, int flags)
2862 struct msghdr msg = {.msg_flags = flags};
2864 char *kaddr = kmap(page);
2866 iov.iov_base = kaddr + offset;
2868 res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size);
2872 EXPORT_SYMBOL(sock_no_sendpage_locked);
2875 * Default Socket Callbacks
2878 static void sock_def_wakeup(struct sock *sk)
2880 struct socket_wq *wq;
2883 wq = rcu_dereference(sk->sk_wq);
2884 if (skwq_has_sleeper(wq))
2885 wake_up_interruptible_all(&wq->wait);
2889 static void sock_def_error_report(struct sock *sk)
2891 struct socket_wq *wq;
2894 wq = rcu_dereference(sk->sk_wq);
2895 if (skwq_has_sleeper(wq))
2896 wake_up_interruptible_poll(&wq->wait, EPOLLERR);
2897 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2901 void sock_def_readable(struct sock *sk)
2903 struct socket_wq *wq;
2906 wq = rcu_dereference(sk->sk_wq);
2907 if (skwq_has_sleeper(wq))
2908 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
2909 EPOLLRDNORM | EPOLLRDBAND);
2910 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2914 static void sock_def_write_space(struct sock *sk)
2916 struct socket_wq *wq;
2920 /* Do not wake up a writer until he can make "significant"
2923 if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= READ_ONCE(sk->sk_sndbuf)) {
2924 wq = rcu_dereference(sk->sk_wq);
2925 if (skwq_has_sleeper(wq))
2926 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2927 EPOLLWRNORM | EPOLLWRBAND);
2929 /* Should agree with poll, otherwise some programs break */
2930 if (sock_writeable(sk))
2931 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2937 static void sock_def_destruct(struct sock *sk)
2941 void sk_send_sigurg(struct sock *sk)
2943 if (sk->sk_socket && sk->sk_socket->file)
2944 if (send_sigurg(&sk->sk_socket->file->f_owner))
2945 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2947 EXPORT_SYMBOL(sk_send_sigurg);
2949 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2950 unsigned long expires)
2952 if (!mod_timer(timer, expires))
2955 EXPORT_SYMBOL(sk_reset_timer);
2957 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2959 if (del_timer(timer))
2962 EXPORT_SYMBOL(sk_stop_timer);
2964 void sk_stop_timer_sync(struct sock *sk, struct timer_list *timer)
2966 if (del_timer_sync(timer))
2969 EXPORT_SYMBOL(sk_stop_timer_sync);
2971 void sock_init_data(struct socket *sock, struct sock *sk)
2974 sk->sk_send_head = NULL;
2976 timer_setup(&sk->sk_timer, NULL, 0);
2978 sk->sk_allocation = GFP_KERNEL;
2979 sk->sk_rcvbuf = READ_ONCE(sysctl_rmem_default);
2980 sk->sk_sndbuf = READ_ONCE(sysctl_wmem_default);
2981 sk->sk_state = TCP_CLOSE;
2982 sk_set_socket(sk, sock);
2984 sock_set_flag(sk, SOCK_ZAPPED);
2987 sk->sk_type = sock->type;
2988 RCU_INIT_POINTER(sk->sk_wq, &sock->wq);
2990 sk->sk_uid = SOCK_INODE(sock)->i_uid;
2992 RCU_INIT_POINTER(sk->sk_wq, NULL);
2993 sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0);
2996 rwlock_init(&sk->sk_callback_lock);
2997 if (sk->sk_kern_sock)
2998 lockdep_set_class_and_name(
2999 &sk->sk_callback_lock,
3000 af_kern_callback_keys + sk->sk_family,
3001 af_family_kern_clock_key_strings[sk->sk_family]);
3003 lockdep_set_class_and_name(
3004 &sk->sk_callback_lock,
3005 af_callback_keys + sk->sk_family,
3006 af_family_clock_key_strings[sk->sk_family]);
3008 sk->sk_state_change = sock_def_wakeup;
3009 sk->sk_data_ready = sock_def_readable;
3010 sk->sk_write_space = sock_def_write_space;
3011 sk->sk_error_report = sock_def_error_report;
3012 sk->sk_destruct = sock_def_destruct;
3014 sk->sk_frag.page = NULL;
3015 sk->sk_frag.offset = 0;
3016 sk->sk_peek_off = -1;
3018 sk->sk_peer_pid = NULL;
3019 sk->sk_peer_cred = NULL;
3020 spin_lock_init(&sk->sk_peer_lock);
3022 sk->sk_write_pending = 0;
3023 sk->sk_rcvlowat = 1;
3024 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
3025 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
3027 sk->sk_stamp = SK_DEFAULT_STAMP;
3028 #if BITS_PER_LONG==32
3029 seqlock_init(&sk->sk_stamp_seq);
3031 atomic_set(&sk->sk_zckey, 0);
3033 #ifdef CONFIG_NET_RX_BUSY_POLL
3035 sk->sk_ll_usec = READ_ONCE(sysctl_net_busy_read);
3038 sk->sk_max_pacing_rate = ~0UL;
3039 sk->sk_pacing_rate = ~0UL;
3040 WRITE_ONCE(sk->sk_pacing_shift, 10);
3041 sk->sk_incoming_cpu = -1;
3043 sk_rx_queue_clear(sk);
3045 * Before updating sk_refcnt, we must commit prior changes to memory
3046 * (Documentation/RCU/rculist_nulls.rst for details)
3049 refcount_set(&sk->sk_refcnt, 1);
3050 atomic_set(&sk->sk_drops, 0);
3052 EXPORT_SYMBOL(sock_init_data);
3054 void lock_sock_nested(struct sock *sk, int subclass)
3057 spin_lock_bh(&sk->sk_lock.slock);
3058 if (sk->sk_lock.owned)
3060 sk->sk_lock.owned = 1;
3061 spin_unlock(&sk->sk_lock.slock);
3063 * The sk_lock has mutex_lock() semantics here:
3065 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
3068 EXPORT_SYMBOL(lock_sock_nested);
3070 void release_sock(struct sock *sk)
3072 spin_lock_bh(&sk->sk_lock.slock);
3073 if (sk->sk_backlog.tail)
3076 /* Warning : release_cb() might need to release sk ownership,
3077 * ie call sock_release_ownership(sk) before us.
3079 if (sk->sk_prot->release_cb)
3080 sk->sk_prot->release_cb(sk);
3082 sock_release_ownership(sk);
3083 if (waitqueue_active(&sk->sk_lock.wq))
3084 wake_up(&sk->sk_lock.wq);
3085 spin_unlock_bh(&sk->sk_lock.slock);
3087 EXPORT_SYMBOL(release_sock);
3090 * lock_sock_fast - fast version of lock_sock
3093 * This version should be used for very small section, where process wont block
3094 * return false if fast path is taken:
3096 * sk_lock.slock locked, owned = 0, BH disabled
3098 * return true if slow path is taken:
3100 * sk_lock.slock unlocked, owned = 1, BH enabled
3102 bool lock_sock_fast(struct sock *sk)
3105 spin_lock_bh(&sk->sk_lock.slock);
3107 if (!sk->sk_lock.owned)
3109 * Note : We must disable BH
3114 sk->sk_lock.owned = 1;
3115 spin_unlock(&sk->sk_lock.slock);
3117 * The sk_lock has mutex_lock() semantics here:
3119 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
3123 EXPORT_SYMBOL(lock_sock_fast);
3125 int sock_gettstamp(struct socket *sock, void __user *userstamp,
3126 bool timeval, bool time32)
3128 struct sock *sk = sock->sk;
3129 struct timespec64 ts;
3131 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
3132 ts = ktime_to_timespec64(sock_read_timestamp(sk));
3133 if (ts.tv_sec == -1)
3135 if (ts.tv_sec == 0) {
3136 ktime_t kt = ktime_get_real();
3137 sock_write_timestamp(sk, kt);
3138 ts = ktime_to_timespec64(kt);
3144 #ifdef CONFIG_COMPAT_32BIT_TIME
3146 return put_old_timespec32(&ts, userstamp);
3148 #ifdef CONFIG_SPARC64
3149 /* beware of padding in sparc64 timeval */
3150 if (timeval && !in_compat_syscall()) {
3151 struct __kernel_old_timeval __user tv = {
3152 .tv_sec = ts.tv_sec,
3153 .tv_usec = ts.tv_nsec,
3155 if (copy_to_user(userstamp, &tv, sizeof(tv)))
3160 return put_timespec64(&ts, userstamp);
3162 EXPORT_SYMBOL(sock_gettstamp);
3164 void sock_enable_timestamp(struct sock *sk, enum sock_flags flag)
3166 if (!sock_flag(sk, flag)) {
3167 unsigned long previous_flags = sk->sk_flags;
3169 sock_set_flag(sk, flag);
3171 * we just set one of the two flags which require net
3172 * time stamping, but time stamping might have been on
3173 * already because of the other one
3175 if (sock_needs_netstamp(sk) &&
3176 !(previous_flags & SK_FLAGS_TIMESTAMP))
3177 net_enable_timestamp();
3181 int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
3182 int level, int type)
3184 struct sock_exterr_skb *serr;
3185 struct sk_buff *skb;
3189 skb = sock_dequeue_err_skb(sk);
3195 msg->msg_flags |= MSG_TRUNC;
3198 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3202 sock_recv_timestamp(msg, sk, skb);
3204 serr = SKB_EXT_ERR(skb);
3205 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
3207 msg->msg_flags |= MSG_ERRQUEUE;
3215 EXPORT_SYMBOL(sock_recv_errqueue);
3218 * Get a socket option on an socket.
3220 * FIX: POSIX 1003.1g is very ambiguous here. It states that
3221 * asynchronous errors should be reported by getsockopt. We assume
3222 * this means if you specify SO_ERROR (otherwise whats the point of it).
3224 int sock_common_getsockopt(struct socket *sock, int level, int optname,
3225 char __user *optval, int __user *optlen)
3227 struct sock *sk = sock->sk;
3229 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
3231 EXPORT_SYMBOL(sock_common_getsockopt);
3233 int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
3236 struct sock *sk = sock->sk;
3240 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
3241 flags & ~MSG_DONTWAIT, &addr_len);
3243 msg->msg_namelen = addr_len;
3246 EXPORT_SYMBOL(sock_common_recvmsg);
3249 * Set socket options on an inet socket.
3251 int sock_common_setsockopt(struct socket *sock, int level, int optname,
3252 sockptr_t optval, unsigned int optlen)
3254 struct sock *sk = sock->sk;
3256 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
3258 EXPORT_SYMBOL(sock_common_setsockopt);
3260 void sk_common_release(struct sock *sk)
3262 if (sk->sk_prot->destroy)
3263 sk->sk_prot->destroy(sk);
3266 * Observation: when sk_common_release is called, processes have
3267 * no access to socket. But net still has.
3268 * Step one, detach it from networking:
3270 * A. Remove from hash tables.
3273 sk->sk_prot->unhash(sk);
3276 * In this point socket cannot receive new packets, but it is possible
3277 * that some packets are in flight because some CPU runs receiver and
3278 * did hash table lookup before we unhashed socket. They will achieve
3279 * receive queue and will be purged by socket destructor.
3281 * Also we still have packets pending on receive queue and probably,
3282 * our own packets waiting in device queues. sock_destroy will drain
3283 * receive queue, but transmitted packets will delay socket destruction
3284 * until the last reference will be released.
3289 xfrm_sk_free_policy(sk);
3291 sk_refcnt_debug_release(sk);
3295 EXPORT_SYMBOL(sk_common_release);
3297 void sk_get_meminfo(const struct sock *sk, u32 *mem)
3299 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
3301 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
3302 mem[SK_MEMINFO_RCVBUF] = READ_ONCE(sk->sk_rcvbuf);
3303 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
3304 mem[SK_MEMINFO_SNDBUF] = READ_ONCE(sk->sk_sndbuf);
3305 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
3306 mem[SK_MEMINFO_WMEM_QUEUED] = READ_ONCE(sk->sk_wmem_queued);
3307 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
3308 mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len);
3309 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
3312 #ifdef CONFIG_PROC_FS
3313 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
3315 int val[PROTO_INUSE_NR];
3318 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
3320 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
3322 __this_cpu_add(net->core.prot_inuse->val[prot->inuse_idx], val);
3324 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
3326 int sock_prot_inuse_get(struct net *net, struct proto *prot)
3328 int cpu, idx = prot->inuse_idx;
3331 for_each_possible_cpu(cpu)
3332 res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx];
3334 return res >= 0 ? res : 0;
3336 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
3338 static void sock_inuse_add(struct net *net, int val)
3340 this_cpu_add(*net->core.sock_inuse, val);
3343 int sock_inuse_get(struct net *net)
3347 for_each_possible_cpu(cpu)
3348 res += *per_cpu_ptr(net->core.sock_inuse, cpu);
3353 EXPORT_SYMBOL_GPL(sock_inuse_get);
3355 static int __net_init sock_inuse_init_net(struct net *net)
3357 net->core.prot_inuse = alloc_percpu(struct prot_inuse);
3358 if (net->core.prot_inuse == NULL)
3361 net->core.sock_inuse = alloc_percpu(int);
3362 if (net->core.sock_inuse == NULL)
3368 free_percpu(net->core.prot_inuse);
3372 static void __net_exit sock_inuse_exit_net(struct net *net)
3374 free_percpu(net->core.prot_inuse);
3375 free_percpu(net->core.sock_inuse);
3378 static struct pernet_operations net_inuse_ops = {
3379 .init = sock_inuse_init_net,
3380 .exit = sock_inuse_exit_net,
3383 static __init int net_inuse_init(void)
3385 if (register_pernet_subsys(&net_inuse_ops))
3386 panic("Cannot initialize net inuse counters");
3391 core_initcall(net_inuse_init);
3393 static int assign_proto_idx(struct proto *prot)
3395 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
3397 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
3398 pr_err("PROTO_INUSE_NR exhausted\n");
3402 set_bit(prot->inuse_idx, proto_inuse_idx);
3406 static void release_proto_idx(struct proto *prot)
3408 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
3409 clear_bit(prot->inuse_idx, proto_inuse_idx);
3412 static inline int assign_proto_idx(struct proto *prot)
3417 static inline void release_proto_idx(struct proto *prot)
3421 static void sock_inuse_add(struct net *net, int val)
3426 static void tw_prot_cleanup(struct timewait_sock_ops *twsk_prot)
3430 kfree(twsk_prot->twsk_slab_name);
3431 twsk_prot->twsk_slab_name = NULL;
3432 kmem_cache_destroy(twsk_prot->twsk_slab);
3433 twsk_prot->twsk_slab = NULL;
3436 static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
3440 kfree(rsk_prot->slab_name);
3441 rsk_prot->slab_name = NULL;
3442 kmem_cache_destroy(rsk_prot->slab);
3443 rsk_prot->slab = NULL;
3446 static int req_prot_init(const struct proto *prot)
3448 struct request_sock_ops *rsk_prot = prot->rsk_prot;
3453 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
3455 if (!rsk_prot->slab_name)
3458 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
3459 rsk_prot->obj_size, 0,
3460 SLAB_ACCOUNT | prot->slab_flags,
3463 if (!rsk_prot->slab) {
3464 pr_crit("%s: Can't create request sock SLAB cache!\n",
3471 int proto_register(struct proto *prot, int alloc_slab)
3476 prot->slab = kmem_cache_create_usercopy(prot->name,
3478 SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT |
3480 prot->useroffset, prot->usersize,
3483 if (prot->slab == NULL) {
3484 pr_crit("%s: Can't create sock SLAB cache!\n",
3489 if (req_prot_init(prot))
3490 goto out_free_request_sock_slab;
3492 if (prot->twsk_prot != NULL) {
3493 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
3495 if (prot->twsk_prot->twsk_slab_name == NULL)
3496 goto out_free_request_sock_slab;
3498 prot->twsk_prot->twsk_slab =
3499 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
3500 prot->twsk_prot->twsk_obj_size,
3505 if (prot->twsk_prot->twsk_slab == NULL)
3506 goto out_free_timewait_sock_slab;
3510 mutex_lock(&proto_list_mutex);
3511 ret = assign_proto_idx(prot);
3513 mutex_unlock(&proto_list_mutex);
3514 goto out_free_timewait_sock_slab;
3516 list_add(&prot->node, &proto_list);
3517 mutex_unlock(&proto_list_mutex);
3520 out_free_timewait_sock_slab:
3521 if (alloc_slab && prot->twsk_prot)
3522 tw_prot_cleanup(prot->twsk_prot);
3523 out_free_request_sock_slab:
3525 req_prot_cleanup(prot->rsk_prot);
3527 kmem_cache_destroy(prot->slab);
3533 EXPORT_SYMBOL(proto_register);
3535 void proto_unregister(struct proto *prot)
3537 mutex_lock(&proto_list_mutex);
3538 release_proto_idx(prot);
3539 list_del(&prot->node);
3540 mutex_unlock(&proto_list_mutex);
3542 kmem_cache_destroy(prot->slab);
3545 req_prot_cleanup(prot->rsk_prot);
3546 tw_prot_cleanup(prot->twsk_prot);
3548 EXPORT_SYMBOL(proto_unregister);
3550 int sock_load_diag_module(int family, int protocol)
3553 if (!sock_is_registered(family))
3556 return request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
3557 NETLINK_SOCK_DIAG, family);
3561 if (family == AF_INET &&
3562 protocol != IPPROTO_RAW &&
3563 protocol < MAX_INET_PROTOS &&
3564 !rcu_access_pointer(inet_protos[protocol]))
3568 return request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
3569 NETLINK_SOCK_DIAG, family, protocol);
3571 EXPORT_SYMBOL(sock_load_diag_module);
3573 #ifdef CONFIG_PROC_FS
3574 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
3575 __acquires(proto_list_mutex)
3577 mutex_lock(&proto_list_mutex);
3578 return seq_list_start_head(&proto_list, *pos);
3581 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3583 return seq_list_next(v, &proto_list, pos);
3586 static void proto_seq_stop(struct seq_file *seq, void *v)
3587 __releases(proto_list_mutex)
3589 mutex_unlock(&proto_list_mutex);
3592 static char proto_method_implemented(const void *method)
3594 return method == NULL ? 'n' : 'y';
3596 static long sock_prot_memory_allocated(struct proto *proto)
3598 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
3601 static const char *sock_prot_memory_pressure(struct proto *proto)
3603 return proto->memory_pressure != NULL ?
3604 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
3607 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
3610 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
3611 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3614 sock_prot_inuse_get(seq_file_net(seq), proto),
3615 sock_prot_memory_allocated(proto),
3616 sock_prot_memory_pressure(proto),
3618 proto->slab == NULL ? "no" : "yes",
3619 module_name(proto->owner),
3620 proto_method_implemented(proto->close),
3621 proto_method_implemented(proto->connect),
3622 proto_method_implemented(proto->disconnect),
3623 proto_method_implemented(proto->accept),
3624 proto_method_implemented(proto->ioctl),
3625 proto_method_implemented(proto->init),
3626 proto_method_implemented(proto->destroy),
3627 proto_method_implemented(proto->shutdown),
3628 proto_method_implemented(proto->setsockopt),
3629 proto_method_implemented(proto->getsockopt),
3630 proto_method_implemented(proto->sendmsg),
3631 proto_method_implemented(proto->recvmsg),
3632 proto_method_implemented(proto->sendpage),
3633 proto_method_implemented(proto->bind),
3634 proto_method_implemented(proto->backlog_rcv),
3635 proto_method_implemented(proto->hash),
3636 proto_method_implemented(proto->unhash),
3637 proto_method_implemented(proto->get_port),
3638 proto_method_implemented(proto->enter_memory_pressure));
3641 static int proto_seq_show(struct seq_file *seq, void *v)
3643 if (v == &proto_list)
3644 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3653 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3655 proto_seq_printf(seq, list_entry(v, struct proto, node));
3659 static const struct seq_operations proto_seq_ops = {
3660 .start = proto_seq_start,
3661 .next = proto_seq_next,
3662 .stop = proto_seq_stop,
3663 .show = proto_seq_show,
3666 static __net_init int proto_init_net(struct net *net)
3668 if (!proc_create_net("protocols", 0444, net->proc_net, &proto_seq_ops,
3669 sizeof(struct seq_net_private)))
3675 static __net_exit void proto_exit_net(struct net *net)
3677 remove_proc_entry("protocols", net->proc_net);
3681 static __net_initdata struct pernet_operations proto_net_ops = {
3682 .init = proto_init_net,
3683 .exit = proto_exit_net,
3686 static int __init proto_init(void)
3688 return register_pernet_subsys(&proto_net_ops);
3691 subsys_initcall(proto_init);
3693 #endif /* PROC_FS */
3695 #ifdef CONFIG_NET_RX_BUSY_POLL
3696 bool sk_busy_loop_end(void *p, unsigned long start_time)
3698 struct sock *sk = p;
3700 return !skb_queue_empty_lockless(&sk->sk_receive_queue) ||
3701 sk_busy_loop_timeout(sk, start_time);
3703 EXPORT_SYMBOL(sk_busy_loop_end);
3704 #endif /* CONFIG_NET_RX_BUSY_POLL */
3706 int sock_bind_add(struct sock *sk, struct sockaddr *addr, int addr_len)
3708 if (!sk->sk_prot->bind_add)
3710 return sk->sk_prot->bind_add(sk, addr, addr_len);
3712 EXPORT_SYMBOL(sock_bind_add);