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>
117 #include <linux/uaccess.h>
119 #include <linux/netdevice.h>
120 #include <net/protocol.h>
121 #include <linux/skbuff.h>
122 #include <net/net_namespace.h>
123 #include <net/request_sock.h>
124 #include <net/sock.h>
125 #include <linux/net_tstamp.h>
126 #include <net/xfrm.h>
127 #include <linux/ipsec.h>
128 #include <net/cls_cgroup.h>
129 #include <net/netprio_cgroup.h>
130 #include <linux/sock_diag.h>
132 #include <linux/filter.h>
133 #include <net/sock_reuseport.h>
134 #include <net/bpf_sk_storage.h>
136 #include <trace/events/sock.h>
139 #include <net/busy_poll.h>
141 static DEFINE_MUTEX(proto_list_mutex);
142 static LIST_HEAD(proto_list);
144 static void sock_inuse_add(struct net *net, int val);
147 * sk_ns_capable - General socket capability test
148 * @sk: Socket to use a capability on or through
149 * @user_ns: The user namespace of the capability to use
150 * @cap: The capability to use
152 * Test to see if the opener of the socket had when the socket was
153 * created and the current process has the capability @cap in the user
154 * namespace @user_ns.
156 bool sk_ns_capable(const struct sock *sk,
157 struct user_namespace *user_ns, int cap)
159 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
160 ns_capable(user_ns, cap);
162 EXPORT_SYMBOL(sk_ns_capable);
165 * sk_capable - Socket global capability test
166 * @sk: Socket to use a capability on or through
167 * @cap: The global capability to use
169 * Test to see if the opener of the socket had when the socket was
170 * created and the current process has the capability @cap in all user
173 bool sk_capable(const struct sock *sk, int cap)
175 return sk_ns_capable(sk, &init_user_ns, cap);
177 EXPORT_SYMBOL(sk_capable);
180 * sk_net_capable - Network namespace socket capability test
181 * @sk: Socket to use a capability on or through
182 * @cap: The capability to use
184 * Test to see if the opener of the socket had when the socket was created
185 * and the current process has the capability @cap over the network namespace
186 * the socket is a member of.
188 bool sk_net_capable(const struct sock *sk, int cap)
190 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
192 EXPORT_SYMBOL(sk_net_capable);
195 * Each address family might have different locking rules, so we have
196 * one slock key per address family and separate keys for internal and
199 static struct lock_class_key af_family_keys[AF_MAX];
200 static struct lock_class_key af_family_kern_keys[AF_MAX];
201 static struct lock_class_key af_family_slock_keys[AF_MAX];
202 static struct lock_class_key af_family_kern_slock_keys[AF_MAX];
205 * Make lock validator output more readable. (we pre-construct these
206 * strings build-time, so that runtime initialization of socket
210 #define _sock_locks(x) \
211 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \
212 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \
213 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \
214 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \
215 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \
216 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \
217 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \
218 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \
219 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \
220 x "27" , x "28" , x "AF_CAN" , \
221 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \
222 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \
223 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \
224 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \
225 x "AF_QIPCRTR", x "AF_SMC" , x "AF_XDP" , \
228 static const char *const af_family_key_strings[AF_MAX+1] = {
229 _sock_locks("sk_lock-")
231 static const char *const af_family_slock_key_strings[AF_MAX+1] = {
232 _sock_locks("slock-")
234 static const char *const af_family_clock_key_strings[AF_MAX+1] = {
235 _sock_locks("clock-")
238 static const char *const af_family_kern_key_strings[AF_MAX+1] = {
239 _sock_locks("k-sk_lock-")
241 static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = {
242 _sock_locks("k-slock-")
244 static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = {
245 _sock_locks("k-clock-")
247 static const char *const af_family_rlock_key_strings[AF_MAX+1] = {
248 _sock_locks("rlock-")
250 static const char *const af_family_wlock_key_strings[AF_MAX+1] = {
251 _sock_locks("wlock-")
253 static const char *const af_family_elock_key_strings[AF_MAX+1] = {
254 _sock_locks("elock-")
258 * sk_callback_lock and sk queues locking rules are per-address-family,
259 * so split the lock classes by using a per-AF key:
261 static struct lock_class_key af_callback_keys[AF_MAX];
262 static struct lock_class_key af_rlock_keys[AF_MAX];
263 static struct lock_class_key af_wlock_keys[AF_MAX];
264 static struct lock_class_key af_elock_keys[AF_MAX];
265 static struct lock_class_key af_kern_callback_keys[AF_MAX];
267 /* Run time adjustable parameters. */
268 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
269 EXPORT_SYMBOL(sysctl_wmem_max);
270 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
271 EXPORT_SYMBOL(sysctl_rmem_max);
272 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
273 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
275 /* Maximal space eaten by iovec or ancillary data plus some space */
276 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
277 EXPORT_SYMBOL(sysctl_optmem_max);
279 int sysctl_tstamp_allow_data __read_mostly = 1;
281 DEFINE_STATIC_KEY_FALSE(memalloc_socks_key);
282 EXPORT_SYMBOL_GPL(memalloc_socks_key);
285 * sk_set_memalloc - sets %SOCK_MEMALLOC
286 * @sk: socket to set it on
288 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
289 * It's the responsibility of the admin to adjust min_free_kbytes
290 * to meet the requirements
292 void sk_set_memalloc(struct sock *sk)
294 sock_set_flag(sk, SOCK_MEMALLOC);
295 sk->sk_allocation |= __GFP_MEMALLOC;
296 static_branch_inc(&memalloc_socks_key);
298 EXPORT_SYMBOL_GPL(sk_set_memalloc);
300 void sk_clear_memalloc(struct sock *sk)
302 sock_reset_flag(sk, SOCK_MEMALLOC);
303 sk->sk_allocation &= ~__GFP_MEMALLOC;
304 static_branch_dec(&memalloc_socks_key);
307 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
308 * progress of swapping. SOCK_MEMALLOC may be cleared while
309 * it has rmem allocations due to the last swapfile being deactivated
310 * but there is a risk that the socket is unusable due to exceeding
311 * the rmem limits. Reclaim the reserves and obey rmem limits again.
315 EXPORT_SYMBOL_GPL(sk_clear_memalloc);
317 int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
320 unsigned int noreclaim_flag;
322 /* these should have been dropped before queueing */
323 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
325 noreclaim_flag = memalloc_noreclaim_save();
326 ret = sk->sk_backlog_rcv(sk, skb);
327 memalloc_noreclaim_restore(noreclaim_flag);
331 EXPORT_SYMBOL(__sk_backlog_rcv);
333 static int sock_get_timeout(long timeo, void *optval, bool old_timeval)
335 struct __kernel_sock_timeval tv;
337 if (timeo == MAX_SCHEDULE_TIMEOUT) {
341 tv.tv_sec = timeo / HZ;
342 tv.tv_usec = ((timeo % HZ) * USEC_PER_SEC) / HZ;
345 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
346 struct old_timeval32 tv32 = { tv.tv_sec, tv.tv_usec };
347 *(struct old_timeval32 *)optval = tv32;
352 struct __kernel_old_timeval old_tv;
353 old_tv.tv_sec = tv.tv_sec;
354 old_tv.tv_usec = tv.tv_usec;
355 *(struct __kernel_old_timeval *)optval = old_tv;
356 return sizeof(old_tv);
359 *(struct __kernel_sock_timeval *)optval = tv;
363 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen, bool old_timeval)
365 struct __kernel_sock_timeval tv;
367 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
368 struct old_timeval32 tv32;
370 if (optlen < sizeof(tv32))
373 if (copy_from_user(&tv32, optval, sizeof(tv32)))
375 tv.tv_sec = tv32.tv_sec;
376 tv.tv_usec = tv32.tv_usec;
377 } else if (old_timeval) {
378 struct __kernel_old_timeval old_tv;
380 if (optlen < sizeof(old_tv))
382 if (copy_from_user(&old_tv, optval, sizeof(old_tv)))
384 tv.tv_sec = old_tv.tv_sec;
385 tv.tv_usec = old_tv.tv_usec;
387 if (optlen < sizeof(tv))
389 if (copy_from_user(&tv, optval, sizeof(tv)))
392 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
396 static int warned __read_mostly;
399 if (warned < 10 && net_ratelimit()) {
401 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
402 __func__, current->comm, task_pid_nr(current));
406 *timeo_p = MAX_SCHEDULE_TIMEOUT;
407 if (tv.tv_sec == 0 && tv.tv_usec == 0)
409 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1))
410 *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP((unsigned long)tv.tv_usec, USEC_PER_SEC / HZ);
414 static void sock_warn_obsolete_bsdism(const char *name)
417 static char warncomm[TASK_COMM_LEN];
418 if (strcmp(warncomm, current->comm) && warned < 5) {
419 strcpy(warncomm, current->comm);
420 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
426 static bool sock_needs_netstamp(const struct sock *sk)
428 switch (sk->sk_family) {
437 static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
439 if (sk->sk_flags & flags) {
440 sk->sk_flags &= ~flags;
441 if (sock_needs_netstamp(sk) &&
442 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
443 net_disable_timestamp();
448 int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
451 struct sk_buff_head *list = &sk->sk_receive_queue;
453 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
454 atomic_inc(&sk->sk_drops);
455 trace_sock_rcvqueue_full(sk, skb);
459 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
460 atomic_inc(&sk->sk_drops);
465 skb_set_owner_r(skb, sk);
467 /* we escape from rcu protected region, make sure we dont leak
472 spin_lock_irqsave(&list->lock, flags);
473 sock_skb_set_dropcount(sk, skb);
474 __skb_queue_tail(list, skb);
475 spin_unlock_irqrestore(&list->lock, flags);
477 if (!sock_flag(sk, SOCK_DEAD))
478 sk->sk_data_ready(sk);
481 EXPORT_SYMBOL(__sock_queue_rcv_skb);
483 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
487 err = sk_filter(sk, skb);
491 return __sock_queue_rcv_skb(sk, skb);
493 EXPORT_SYMBOL(sock_queue_rcv_skb);
495 int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
496 const int nested, unsigned int trim_cap, bool refcounted)
498 int rc = NET_RX_SUCCESS;
500 if (sk_filter_trim_cap(sk, skb, trim_cap))
501 goto discard_and_relse;
505 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
506 atomic_inc(&sk->sk_drops);
507 goto discard_and_relse;
510 bh_lock_sock_nested(sk);
513 if (!sock_owned_by_user(sk)) {
515 * trylock + unlock semantics:
517 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
519 rc = sk_backlog_rcv(sk, skb);
521 mutex_release(&sk->sk_lock.dep_map, _RET_IP_);
522 } else if (sk_add_backlog(sk, skb, READ_ONCE(sk->sk_rcvbuf))) {
524 atomic_inc(&sk->sk_drops);
525 goto discard_and_relse;
537 EXPORT_SYMBOL(__sk_receive_skb);
539 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
541 struct dst_entry *dst = __sk_dst_get(sk);
543 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
544 sk_tx_queue_clear(sk);
545 sk->sk_dst_pending_confirm = 0;
546 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
553 EXPORT_SYMBOL(__sk_dst_check);
555 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
557 struct dst_entry *dst = sk_dst_get(sk);
559 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
567 EXPORT_SYMBOL(sk_dst_check);
569 static int sock_setbindtodevice_locked(struct sock *sk, int ifindex)
571 int ret = -ENOPROTOOPT;
572 #ifdef CONFIG_NETDEVICES
573 struct net *net = sock_net(sk);
577 if (!ns_capable(net->user_ns, CAP_NET_RAW))
584 sk->sk_bound_dev_if = ifindex;
585 if (sk->sk_prot->rehash)
586 sk->sk_prot->rehash(sk);
597 static int sock_setbindtodevice(struct sock *sk, char __user *optval,
600 int ret = -ENOPROTOOPT;
601 #ifdef CONFIG_NETDEVICES
602 struct net *net = sock_net(sk);
603 char devname[IFNAMSIZ];
610 /* Bind this socket to a particular device like "eth0",
611 * as specified in the passed interface name. If the
612 * name is "" or the option length is zero the socket
615 if (optlen > IFNAMSIZ - 1)
616 optlen = IFNAMSIZ - 1;
617 memset(devname, 0, sizeof(devname));
620 if (copy_from_user(devname, optval, optlen))
624 if (devname[0] != '\0') {
625 struct net_device *dev;
628 dev = dev_get_by_name_rcu(net, devname);
630 index = dev->ifindex;
638 ret = sock_setbindtodevice_locked(sk, index);
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 static inline void sock_valbool_flag(struct sock *sk, enum sock_flags bit,
691 sock_set_flag(sk, bit);
693 sock_reset_flag(sk, bit);
696 bool sk_mc_loop(struct sock *sk)
698 if (dev_recursion_level())
702 switch (sk->sk_family) {
704 return inet_sk(sk)->mc_loop;
705 #if IS_ENABLED(CONFIG_IPV6)
707 return inet6_sk(sk)->mc_loop;
713 EXPORT_SYMBOL(sk_mc_loop);
716 * This is meant for all protocols to use and covers goings on
717 * at the socket level. Everything here is generic.
720 int sock_setsockopt(struct socket *sock, int level, int optname,
721 char __user *optval, unsigned int optlen)
723 struct sock_txtime sk_txtime;
724 struct sock *sk = sock->sk;
731 * Options without arguments
734 if (optname == SO_BINDTODEVICE)
735 return sock_setbindtodevice(sk, optval, optlen);
737 if (optlen < sizeof(int))
740 if (get_user(val, (int __user *)optval))
743 valbool = val ? 1 : 0;
749 if (val && !capable(CAP_NET_ADMIN))
752 sock_valbool_flag(sk, SOCK_DBG, valbool);
755 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
758 sk->sk_reuseport = valbool;
767 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
771 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
774 /* Don't error on this BSD doesn't and if you think
775 * about it this is right. Otherwise apps have to
776 * play 'guess the biggest size' games. RCVBUF/SNDBUF
777 * are treated in BSD as hints
779 val = min_t(u32, val, sysctl_wmem_max);
781 /* Ensure val * 2 fits into an int, to prevent max_t()
782 * from treating it as a negative value.
784 val = min_t(int, val, INT_MAX / 2);
785 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
786 WRITE_ONCE(sk->sk_sndbuf,
787 max_t(int, val * 2, SOCK_MIN_SNDBUF));
788 /* Wake up sending tasks if we upped the value. */
789 sk->sk_write_space(sk);
793 if (!capable(CAP_NET_ADMIN)) {
798 /* No negative values (to prevent underflow, as val will be
806 /* Don't error on this BSD doesn't and if you think
807 * about it this is right. Otherwise apps have to
808 * play 'guess the biggest size' games. RCVBUF/SNDBUF
809 * are treated in BSD as hints
811 val = min_t(u32, val, sysctl_rmem_max);
813 /* Ensure val * 2 fits into an int, to prevent max_t()
814 * from treating it as a negative value.
816 val = min_t(int, val, INT_MAX / 2);
817 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
819 * We double it on the way in to account for
820 * "struct sk_buff" etc. overhead. Applications
821 * assume that the SO_RCVBUF setting they make will
822 * allow that much actual data to be received on that
825 * Applications are unaware that "struct sk_buff" and
826 * other overheads allocate from the receive buffer
827 * during socket buffer allocation.
829 * And after considering the possible alternatives,
830 * returning the value we actually used in getsockopt
831 * is the most desirable behavior.
833 WRITE_ONCE(sk->sk_rcvbuf,
834 max_t(int, val * 2, SOCK_MIN_RCVBUF));
838 if (!capable(CAP_NET_ADMIN)) {
843 /* No negative values (to prevent underflow, as val will be
851 if (sk->sk_prot->keepalive)
852 sk->sk_prot->keepalive(sk, valbool);
853 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
857 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
861 sk->sk_no_check_tx = valbool;
865 if ((val >= 0 && val <= 6) ||
866 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
867 sk->sk_priority = val;
873 if (optlen < sizeof(ling)) {
874 ret = -EINVAL; /* 1003.1g */
877 if (copy_from_user(&ling, optval, sizeof(ling))) {
882 sock_reset_flag(sk, SOCK_LINGER);
884 #if (BITS_PER_LONG == 32)
885 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
886 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
889 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
890 sock_set_flag(sk, SOCK_LINGER);
895 sock_warn_obsolete_bsdism("setsockopt");
900 set_bit(SOCK_PASSCRED, &sock->flags);
902 clear_bit(SOCK_PASSCRED, &sock->flags);
905 case SO_TIMESTAMP_OLD:
906 case SO_TIMESTAMP_NEW:
907 case SO_TIMESTAMPNS_OLD:
908 case SO_TIMESTAMPNS_NEW:
910 if (optname == SO_TIMESTAMP_NEW || optname == SO_TIMESTAMPNS_NEW)
911 sock_set_flag(sk, SOCK_TSTAMP_NEW);
913 sock_reset_flag(sk, SOCK_TSTAMP_NEW);
915 if (optname == SO_TIMESTAMP_OLD || optname == SO_TIMESTAMP_NEW)
916 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
918 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
919 sock_set_flag(sk, SOCK_RCVTSTAMP);
920 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
922 sock_reset_flag(sk, SOCK_RCVTSTAMP);
923 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
924 sock_reset_flag(sk, SOCK_TSTAMP_NEW);
928 case SO_TIMESTAMPING_NEW:
929 sock_set_flag(sk, SOCK_TSTAMP_NEW);
931 case SO_TIMESTAMPING_OLD:
932 if (val & ~SOF_TIMESTAMPING_MASK) {
937 if (val & SOF_TIMESTAMPING_OPT_ID &&
938 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
939 if (sk->sk_protocol == IPPROTO_TCP &&
940 sk->sk_type == SOCK_STREAM) {
941 if ((1 << sk->sk_state) &
942 (TCPF_CLOSE | TCPF_LISTEN)) {
946 sk->sk_tskey = tcp_sk(sk)->snd_una;
952 if (val & SOF_TIMESTAMPING_OPT_STATS &&
953 !(val & SOF_TIMESTAMPING_OPT_TSONLY)) {
958 sk->sk_tsflags = val;
959 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
960 sock_enable_timestamp(sk,
961 SOCK_TIMESTAMPING_RX_SOFTWARE);
963 if (optname == SO_TIMESTAMPING_NEW)
964 sock_reset_flag(sk, SOCK_TSTAMP_NEW);
966 sock_disable_timestamp(sk,
967 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
974 if (sock->ops->set_rcvlowat)
975 ret = sock->ops->set_rcvlowat(sk, val);
977 WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
980 case SO_RCVTIMEO_OLD:
981 case SO_RCVTIMEO_NEW:
982 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen, optname == SO_RCVTIMEO_OLD);
985 case SO_SNDTIMEO_OLD:
986 case SO_SNDTIMEO_NEW:
987 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen, optname == SO_SNDTIMEO_OLD);
990 case SO_ATTACH_FILTER:
992 if (optlen == sizeof(struct sock_fprog)) {
993 struct sock_fprog fprog;
996 if (copy_from_user(&fprog, optval, sizeof(fprog)))
999 ret = sk_attach_filter(&fprog, sk);
1005 if (optlen == sizeof(u32)) {
1009 if (copy_from_user(&ufd, optval, sizeof(ufd)))
1012 ret = sk_attach_bpf(ufd, sk);
1016 case SO_ATTACH_REUSEPORT_CBPF:
1018 if (optlen == sizeof(struct sock_fprog)) {
1019 struct sock_fprog fprog;
1022 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1025 ret = sk_reuseport_attach_filter(&fprog, sk);
1029 case SO_ATTACH_REUSEPORT_EBPF:
1031 if (optlen == sizeof(u32)) {
1035 if (copy_from_user(&ufd, optval, sizeof(ufd)))
1038 ret = sk_reuseport_attach_bpf(ufd, sk);
1042 case SO_DETACH_REUSEPORT_BPF:
1043 ret = reuseport_detach_prog(sk);
1046 case SO_DETACH_FILTER:
1047 ret = sk_detach_filter(sk);
1050 case SO_LOCK_FILTER:
1051 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
1054 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
1059 set_bit(SOCK_PASSSEC, &sock->flags);
1061 clear_bit(SOCK_PASSSEC, &sock->flags);
1064 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1066 } else if (val != sk->sk_mark) {
1073 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
1076 case SO_WIFI_STATUS:
1077 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
1081 if (sock->ops->set_peek_off)
1082 ret = sock->ops->set_peek_off(sk, val);
1088 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
1091 case SO_SELECT_ERR_QUEUE:
1092 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
1095 #ifdef CONFIG_NET_RX_BUSY_POLL
1097 /* allow unprivileged users to decrease the value */
1098 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
1104 sk->sk_ll_usec = val;
1109 case SO_MAX_PACING_RATE:
1111 unsigned long ulval = (val == ~0U) ? ~0UL : val;
1113 if (sizeof(ulval) != sizeof(val) &&
1114 optlen >= sizeof(ulval) &&
1115 get_user(ulval, (unsigned long __user *)optval)) {
1120 cmpxchg(&sk->sk_pacing_status,
1123 sk->sk_max_pacing_rate = ulval;
1124 sk->sk_pacing_rate = min(sk->sk_pacing_rate, ulval);
1127 case SO_INCOMING_CPU:
1128 WRITE_ONCE(sk->sk_incoming_cpu, val);
1133 dst_negative_advice(sk);
1137 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) {
1138 if (!((sk->sk_type == SOCK_STREAM &&
1139 sk->sk_protocol == IPPROTO_TCP) ||
1140 (sk->sk_type == SOCK_DGRAM &&
1141 sk->sk_protocol == IPPROTO_UDP)))
1143 } else if (sk->sk_family != PF_RDS) {
1147 if (val < 0 || val > 1)
1150 sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool);
1155 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1157 } else if (optlen != sizeof(struct sock_txtime)) {
1159 } else if (copy_from_user(&sk_txtime, optval,
1160 sizeof(struct sock_txtime))) {
1162 } else if (sk_txtime.flags & ~SOF_TXTIME_FLAGS_MASK) {
1165 sock_valbool_flag(sk, SOCK_TXTIME, true);
1166 sk->sk_clockid = sk_txtime.clockid;
1167 sk->sk_txtime_deadline_mode =
1168 !!(sk_txtime.flags & SOF_TXTIME_DEADLINE_MODE);
1169 sk->sk_txtime_report_errors =
1170 !!(sk_txtime.flags & SOF_TXTIME_REPORT_ERRORS);
1174 case SO_BINDTOIFINDEX:
1175 ret = sock_setbindtodevice_locked(sk, val);
1185 EXPORT_SYMBOL(sock_setsockopt);
1188 static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1189 struct ucred *ucred)
1191 ucred->pid = pid_vnr(pid);
1192 ucred->uid = ucred->gid = -1;
1194 struct user_namespace *current_ns = current_user_ns();
1196 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1197 ucred->gid = from_kgid_munged(current_ns, cred->egid);
1201 static int groups_to_user(gid_t __user *dst, const struct group_info *src)
1203 struct user_namespace *user_ns = current_user_ns();
1206 for (i = 0; i < src->ngroups; i++)
1207 if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i))
1213 int sock_getsockopt(struct socket *sock, int level, int optname,
1214 char __user *optval, int __user *optlen)
1216 struct sock *sk = sock->sk;
1221 unsigned long ulval;
1223 struct old_timeval32 tm32;
1224 struct __kernel_old_timeval tm;
1225 struct __kernel_sock_timeval stm;
1226 struct sock_txtime txtime;
1229 int lv = sizeof(int);
1232 if (get_user(len, optlen))
1237 memset(&v, 0, sizeof(v));
1241 v.val = sock_flag(sk, SOCK_DBG);
1245 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1249 v.val = sock_flag(sk, SOCK_BROADCAST);
1253 v.val = sk->sk_sndbuf;
1257 v.val = sk->sk_rcvbuf;
1261 v.val = sk->sk_reuse;
1265 v.val = sk->sk_reuseport;
1269 v.val = sock_flag(sk, SOCK_KEEPOPEN);
1273 v.val = sk->sk_type;
1277 v.val = sk->sk_protocol;
1281 v.val = sk->sk_family;
1285 v.val = -sock_error(sk);
1287 v.val = xchg(&sk->sk_err_soft, 0);
1291 v.val = sock_flag(sk, SOCK_URGINLINE);
1295 v.val = sk->sk_no_check_tx;
1299 v.val = sk->sk_priority;
1303 lv = sizeof(v.ling);
1304 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
1305 v.ling.l_linger = sk->sk_lingertime / HZ;
1309 sock_warn_obsolete_bsdism("getsockopt");
1312 case SO_TIMESTAMP_OLD:
1313 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1314 !sock_flag(sk, SOCK_TSTAMP_NEW) &&
1315 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1318 case SO_TIMESTAMPNS_OLD:
1319 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && !sock_flag(sk, SOCK_TSTAMP_NEW);
1322 case SO_TIMESTAMP_NEW:
1323 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && sock_flag(sk, SOCK_TSTAMP_NEW);
1326 case SO_TIMESTAMPNS_NEW:
1327 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && sock_flag(sk, SOCK_TSTAMP_NEW);
1330 case SO_TIMESTAMPING_OLD:
1331 v.val = sk->sk_tsflags;
1334 case SO_RCVTIMEO_OLD:
1335 case SO_RCVTIMEO_NEW:
1336 lv = sock_get_timeout(sk->sk_rcvtimeo, &v, SO_RCVTIMEO_OLD == optname);
1339 case SO_SNDTIMEO_OLD:
1340 case SO_SNDTIMEO_NEW:
1341 lv = sock_get_timeout(sk->sk_sndtimeo, &v, SO_SNDTIMEO_OLD == optname);
1345 v.val = sk->sk_rcvlowat;
1353 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1358 struct ucred peercred;
1359 if (len > sizeof(peercred))
1360 len = sizeof(peercred);
1361 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1362 if (copy_to_user(optval, &peercred, len))
1371 if (!sk->sk_peer_cred)
1374 n = sk->sk_peer_cred->group_info->ngroups;
1375 if (len < n * sizeof(gid_t)) {
1376 len = n * sizeof(gid_t);
1377 return put_user(len, optlen) ? -EFAULT : -ERANGE;
1379 len = n * sizeof(gid_t);
1381 ret = groups_to_user((gid_t __user *)optval,
1382 sk->sk_peer_cred->group_info);
1392 lv = sock->ops->getname(sock, (struct sockaddr *)address, 2);
1397 if (copy_to_user(optval, address, len))
1402 /* Dubious BSD thing... Probably nobody even uses it, but
1403 * the UNIX standard wants it for whatever reason... -DaveM
1406 v.val = sk->sk_state == TCP_LISTEN;
1410 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1414 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1417 v.val = sk->sk_mark;
1421 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1424 case SO_WIFI_STATUS:
1425 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1429 if (!sock->ops->set_peek_off)
1432 v.val = sk->sk_peek_off;
1435 v.val = sock_flag(sk, SOCK_NOFCS);
1438 case SO_BINDTODEVICE:
1439 return sock_getbindtodevice(sk, optval, optlen, len);
1442 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1448 case SO_LOCK_FILTER:
1449 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1452 case SO_BPF_EXTENSIONS:
1453 v.val = bpf_tell_extensions();
1456 case SO_SELECT_ERR_QUEUE:
1457 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1460 #ifdef CONFIG_NET_RX_BUSY_POLL
1462 v.val = sk->sk_ll_usec;
1466 case SO_MAX_PACING_RATE:
1467 if (sizeof(v.ulval) != sizeof(v.val) && len >= sizeof(v.ulval)) {
1468 lv = sizeof(v.ulval);
1469 v.ulval = sk->sk_max_pacing_rate;
1472 v.val = min_t(unsigned long, sk->sk_max_pacing_rate, ~0U);
1476 case SO_INCOMING_CPU:
1477 v.val = READ_ONCE(sk->sk_incoming_cpu);
1482 u32 meminfo[SK_MEMINFO_VARS];
1484 sk_get_meminfo(sk, meminfo);
1486 len = min_t(unsigned int, len, sizeof(meminfo));
1487 if (copy_to_user(optval, &meminfo, len))
1493 #ifdef CONFIG_NET_RX_BUSY_POLL
1494 case SO_INCOMING_NAPI_ID:
1495 v.val = READ_ONCE(sk->sk_napi_id);
1497 /* aggregate non-NAPI IDs down to 0 */
1498 if (v.val < MIN_NAPI_ID)
1508 v.val64 = sock_gen_cookie(sk);
1512 v.val = sock_flag(sk, SOCK_ZEROCOPY);
1516 lv = sizeof(v.txtime);
1517 v.txtime.clockid = sk->sk_clockid;
1518 v.txtime.flags |= sk->sk_txtime_deadline_mode ?
1519 SOF_TXTIME_DEADLINE_MODE : 0;
1520 v.txtime.flags |= sk->sk_txtime_report_errors ?
1521 SOF_TXTIME_REPORT_ERRORS : 0;
1524 case SO_BINDTOIFINDEX:
1525 v.val = sk->sk_bound_dev_if;
1529 /* We implement the SO_SNDLOWAT etc to not be settable
1532 return -ENOPROTOOPT;
1537 if (copy_to_user(optval, &v, len))
1540 if (put_user(len, optlen))
1546 * Initialize an sk_lock.
1548 * (We also register the sk_lock with the lock validator.)
1550 static inline void sock_lock_init(struct sock *sk)
1552 if (sk->sk_kern_sock)
1553 sock_lock_init_class_and_name(
1555 af_family_kern_slock_key_strings[sk->sk_family],
1556 af_family_kern_slock_keys + sk->sk_family,
1557 af_family_kern_key_strings[sk->sk_family],
1558 af_family_kern_keys + sk->sk_family);
1560 sock_lock_init_class_and_name(
1562 af_family_slock_key_strings[sk->sk_family],
1563 af_family_slock_keys + sk->sk_family,
1564 af_family_key_strings[sk->sk_family],
1565 af_family_keys + sk->sk_family);
1569 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1570 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1571 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1573 static void sock_copy(struct sock *nsk, const struct sock *osk)
1575 #ifdef CONFIG_SECURITY_NETWORK
1576 void *sptr = nsk->sk_security;
1578 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1580 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1581 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1583 #ifdef CONFIG_SECURITY_NETWORK
1584 nsk->sk_security = sptr;
1585 security_sk_clone(osk, nsk);
1589 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1593 struct kmem_cache *slab;
1597 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1600 if (want_init_on_alloc(priority))
1601 sk_prot_clear_nulls(sk, prot->obj_size);
1603 sk = kmalloc(prot->obj_size, priority);
1606 if (security_sk_alloc(sk, family, priority))
1609 if (!try_module_get(prot->owner))
1611 sk_tx_queue_clear(sk);
1617 security_sk_free(sk);
1620 kmem_cache_free(slab, sk);
1626 static void sk_prot_free(struct proto *prot, struct sock *sk)
1628 struct kmem_cache *slab;
1629 struct module *owner;
1631 owner = prot->owner;
1634 cgroup_sk_free(&sk->sk_cgrp_data);
1635 mem_cgroup_sk_free(sk);
1636 security_sk_free(sk);
1638 kmem_cache_free(slab, sk);
1645 * sk_alloc - All socket objects are allocated here
1646 * @net: the applicable net namespace
1647 * @family: protocol family
1648 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1649 * @prot: struct proto associated with this new sock instance
1650 * @kern: is this to be a kernel socket?
1652 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1653 struct proto *prot, int kern)
1657 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1659 sk->sk_family = family;
1661 * See comment in struct sock definition to understand
1662 * why we need sk_prot_creator -acme
1664 sk->sk_prot = sk->sk_prot_creator = prot;
1665 sk->sk_kern_sock = kern;
1667 sk->sk_net_refcnt = kern ? 0 : 1;
1668 if (likely(sk->sk_net_refcnt)) {
1670 sock_inuse_add(net, 1);
1673 sock_net_set(sk, net);
1674 refcount_set(&sk->sk_wmem_alloc, 1);
1676 mem_cgroup_sk_alloc(sk);
1677 cgroup_sk_alloc(&sk->sk_cgrp_data);
1678 sock_update_classid(&sk->sk_cgrp_data);
1679 sock_update_netprioidx(&sk->sk_cgrp_data);
1684 EXPORT_SYMBOL(sk_alloc);
1686 /* Sockets having SOCK_RCU_FREE will call this function after one RCU
1687 * grace period. This is the case for UDP sockets and TCP listeners.
1689 static void __sk_destruct(struct rcu_head *head)
1691 struct sock *sk = container_of(head, struct sock, sk_rcu);
1692 struct sk_filter *filter;
1694 if (sk->sk_destruct)
1695 sk->sk_destruct(sk);
1697 filter = rcu_dereference_check(sk->sk_filter,
1698 refcount_read(&sk->sk_wmem_alloc) == 0);
1700 sk_filter_uncharge(sk, filter);
1701 RCU_INIT_POINTER(sk->sk_filter, NULL);
1704 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1706 #ifdef CONFIG_BPF_SYSCALL
1707 bpf_sk_storage_free(sk);
1710 if (atomic_read(&sk->sk_omem_alloc))
1711 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1712 __func__, atomic_read(&sk->sk_omem_alloc));
1714 if (sk->sk_frag.page) {
1715 put_page(sk->sk_frag.page);
1716 sk->sk_frag.page = NULL;
1719 if (sk->sk_peer_cred)
1720 put_cred(sk->sk_peer_cred);
1721 put_pid(sk->sk_peer_pid);
1722 if (likely(sk->sk_net_refcnt))
1723 put_net(sock_net(sk));
1724 sk_prot_free(sk->sk_prot_creator, sk);
1727 void sk_destruct(struct sock *sk)
1729 bool use_call_rcu = sock_flag(sk, SOCK_RCU_FREE);
1731 if (rcu_access_pointer(sk->sk_reuseport_cb)) {
1732 reuseport_detach_sock(sk);
1733 use_call_rcu = true;
1737 call_rcu(&sk->sk_rcu, __sk_destruct);
1739 __sk_destruct(&sk->sk_rcu);
1742 static void __sk_free(struct sock *sk)
1744 if (likely(sk->sk_net_refcnt))
1745 sock_inuse_add(sock_net(sk), -1);
1747 if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk)))
1748 sock_diag_broadcast_destroy(sk);
1753 void sk_free(struct sock *sk)
1756 * We subtract one from sk_wmem_alloc and can know if
1757 * some packets are still in some tx queue.
1758 * If not null, sock_wfree() will call __sk_free(sk) later
1760 if (refcount_dec_and_test(&sk->sk_wmem_alloc))
1763 EXPORT_SYMBOL(sk_free);
1765 static void sk_init_common(struct sock *sk)
1767 skb_queue_head_init(&sk->sk_receive_queue);
1768 skb_queue_head_init(&sk->sk_write_queue);
1769 skb_queue_head_init(&sk->sk_error_queue);
1771 rwlock_init(&sk->sk_callback_lock);
1772 lockdep_set_class_and_name(&sk->sk_receive_queue.lock,
1773 af_rlock_keys + sk->sk_family,
1774 af_family_rlock_key_strings[sk->sk_family]);
1775 lockdep_set_class_and_name(&sk->sk_write_queue.lock,
1776 af_wlock_keys + sk->sk_family,
1777 af_family_wlock_key_strings[sk->sk_family]);
1778 lockdep_set_class_and_name(&sk->sk_error_queue.lock,
1779 af_elock_keys + sk->sk_family,
1780 af_family_elock_key_strings[sk->sk_family]);
1781 lockdep_set_class_and_name(&sk->sk_callback_lock,
1782 af_callback_keys + sk->sk_family,
1783 af_family_clock_key_strings[sk->sk_family]);
1787 * sk_clone_lock - clone a socket, and lock its clone
1788 * @sk: the socket to clone
1789 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1791 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1793 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1796 bool is_charged = true;
1798 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1799 if (newsk != NULL) {
1800 struct sk_filter *filter;
1802 sock_copy(newsk, sk);
1804 newsk->sk_prot_creator = sk->sk_prot;
1807 if (likely(newsk->sk_net_refcnt))
1808 get_net(sock_net(newsk));
1809 sk_node_init(&newsk->sk_node);
1810 sock_lock_init(newsk);
1811 bh_lock_sock(newsk);
1812 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1813 newsk->sk_backlog.len = 0;
1815 atomic_set(&newsk->sk_rmem_alloc, 0);
1817 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1819 refcount_set(&newsk->sk_wmem_alloc, 1);
1820 atomic_set(&newsk->sk_omem_alloc, 0);
1821 sk_init_common(newsk);
1823 newsk->sk_dst_cache = NULL;
1824 newsk->sk_dst_pending_confirm = 0;
1825 newsk->sk_wmem_queued = 0;
1826 newsk->sk_forward_alloc = 0;
1827 atomic_set(&newsk->sk_drops, 0);
1828 newsk->sk_send_head = NULL;
1829 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1830 atomic_set(&newsk->sk_zckey, 0);
1832 sock_reset_flag(newsk, SOCK_DONE);
1834 /* sk->sk_memcg will be populated at accept() time */
1835 newsk->sk_memcg = NULL;
1837 cgroup_sk_alloc(&newsk->sk_cgrp_data);
1840 filter = rcu_dereference(sk->sk_filter);
1842 /* though it's an empty new sock, the charging may fail
1843 * if sysctl_optmem_max was changed between creation of
1844 * original socket and cloning
1846 is_charged = sk_filter_charge(newsk, filter);
1847 RCU_INIT_POINTER(newsk->sk_filter, filter);
1850 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
1851 /* We need to make sure that we don't uncharge the new
1852 * socket if we couldn't charge it in the first place
1853 * as otherwise we uncharge the parent's filter.
1856 RCU_INIT_POINTER(newsk->sk_filter, NULL);
1857 sk_free_unlock_clone(newsk);
1861 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
1863 if (bpf_sk_storage_clone(sk, newsk)) {
1864 sk_free_unlock_clone(newsk);
1870 newsk->sk_err_soft = 0;
1871 newsk->sk_priority = 0;
1872 newsk->sk_incoming_cpu = raw_smp_processor_id();
1873 if (likely(newsk->sk_net_refcnt))
1874 sock_inuse_add(sock_net(newsk), 1);
1877 * Before updating sk_refcnt, we must commit prior changes to memory
1878 * (Documentation/RCU/rculist_nulls.txt for details)
1881 refcount_set(&newsk->sk_refcnt, 2);
1884 * Increment the counter in the same struct proto as the master
1885 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1886 * is the same as sk->sk_prot->socks, as this field was copied
1889 * This _changes_ the previous behaviour, where
1890 * tcp_create_openreq_child always was incrementing the
1891 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1892 * to be taken into account in all callers. -acme
1894 sk_refcnt_debug_inc(newsk);
1895 sk_set_socket(newsk, NULL);
1896 RCU_INIT_POINTER(newsk->sk_wq, NULL);
1898 if (newsk->sk_prot->sockets_allocated)
1899 sk_sockets_allocated_inc(newsk);
1901 if (sock_needs_netstamp(sk) &&
1902 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1903 net_enable_timestamp();
1908 EXPORT_SYMBOL_GPL(sk_clone_lock);
1910 void sk_free_unlock_clone(struct sock *sk)
1912 /* It is still raw copy of parent, so invalidate
1913 * destructor and make plain sk_free() */
1914 sk->sk_destruct = NULL;
1918 EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
1920 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1924 sk_dst_set(sk, dst);
1925 sk->sk_route_caps = dst->dev->features | sk->sk_route_forced_caps;
1926 if (sk->sk_route_caps & NETIF_F_GSO)
1927 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1928 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1929 if (sk_can_gso(sk)) {
1930 if (dst->header_len && !xfrm_dst_offload_ok(dst)) {
1931 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1933 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1934 sk->sk_gso_max_size = dst->dev->gso_max_size;
1935 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
1938 sk->sk_gso_max_segs = max_segs;
1940 EXPORT_SYMBOL_GPL(sk_setup_caps);
1943 * Simple resource managers for sockets.
1948 * Write buffer destructor automatically called from kfree_skb.
1950 void sock_wfree(struct sk_buff *skb)
1952 struct sock *sk = skb->sk;
1953 unsigned int len = skb->truesize;
1955 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1957 * Keep a reference on sk_wmem_alloc, this will be released
1958 * after sk_write_space() call
1960 WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc));
1961 sk->sk_write_space(sk);
1965 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1966 * could not do because of in-flight packets
1968 if (refcount_sub_and_test(len, &sk->sk_wmem_alloc))
1971 EXPORT_SYMBOL(sock_wfree);
1973 /* This variant of sock_wfree() is used by TCP,
1974 * since it sets SOCK_USE_WRITE_QUEUE.
1976 void __sock_wfree(struct sk_buff *skb)
1978 struct sock *sk = skb->sk;
1980 if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
1984 void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1989 if (unlikely(!sk_fullsock(sk))) {
1990 skb->destructor = sock_edemux;
1995 skb->destructor = sock_wfree;
1996 skb_set_hash_from_sk(skb, sk);
1998 * We used to take a refcount on sk, but following operation
1999 * is enough to guarantee sk_free() wont free this sock until
2000 * all in-flight packets are completed
2002 refcount_add(skb->truesize, &sk->sk_wmem_alloc);
2004 EXPORT_SYMBOL(skb_set_owner_w);
2006 static bool can_skb_orphan_partial(const struct sk_buff *skb)
2008 #ifdef CONFIG_TLS_DEVICE
2009 /* Drivers depend on in-order delivery for crypto offload,
2010 * partial orphan breaks out-of-order-OK logic.
2015 return (skb->destructor == sock_wfree ||
2016 (IS_ENABLED(CONFIG_INET) && skb->destructor == tcp_wfree));
2019 /* This helper is used by netem, as it can hold packets in its
2020 * delay queue. We want to allow the owner socket to send more
2021 * packets, as if they were already TX completed by a typical driver.
2022 * But we also want to keep skb->sk set because some packet schedulers
2023 * rely on it (sch_fq for example).
2025 void skb_orphan_partial(struct sk_buff *skb)
2027 if (skb_is_tcp_pure_ack(skb))
2030 if (can_skb_orphan_partial(skb)) {
2031 struct sock *sk = skb->sk;
2033 if (refcount_inc_not_zero(&sk->sk_refcnt)) {
2034 WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc));
2035 skb->destructor = sock_efree;
2041 EXPORT_SYMBOL(skb_orphan_partial);
2044 * Read buffer destructor automatically called from kfree_skb.
2046 void sock_rfree(struct sk_buff *skb)
2048 struct sock *sk = skb->sk;
2049 unsigned int len = skb->truesize;
2051 atomic_sub(len, &sk->sk_rmem_alloc);
2052 sk_mem_uncharge(sk, len);
2054 EXPORT_SYMBOL(sock_rfree);
2057 * Buffer destructor for skbs that are not used directly in read or write
2058 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
2060 void sock_efree(struct sk_buff *skb)
2064 EXPORT_SYMBOL(sock_efree);
2066 kuid_t sock_i_uid(struct sock *sk)
2070 read_lock_bh(&sk->sk_callback_lock);
2071 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
2072 read_unlock_bh(&sk->sk_callback_lock);
2075 EXPORT_SYMBOL(sock_i_uid);
2077 unsigned long sock_i_ino(struct sock *sk)
2081 read_lock_bh(&sk->sk_callback_lock);
2082 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
2083 read_unlock_bh(&sk->sk_callback_lock);
2086 EXPORT_SYMBOL(sock_i_ino);
2089 * Allocate a skb from the socket's send buffer.
2091 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
2095 refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf)) {
2096 struct sk_buff *skb = alloc_skb(size, priority);
2099 skb_set_owner_w(skb, sk);
2105 EXPORT_SYMBOL(sock_wmalloc);
2107 static void sock_ofree(struct sk_buff *skb)
2109 struct sock *sk = skb->sk;
2111 atomic_sub(skb->truesize, &sk->sk_omem_alloc);
2114 struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size,
2117 struct sk_buff *skb;
2119 /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */
2120 if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) >
2124 skb = alloc_skb(size, priority);
2128 atomic_add(skb->truesize, &sk->sk_omem_alloc);
2130 skb->destructor = sock_ofree;
2135 * Allocate a memory block from the socket's option memory buffer.
2137 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
2139 if ((unsigned int)size <= sysctl_optmem_max &&
2140 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
2142 /* First do the add, to avoid the race if kmalloc
2145 atomic_add(size, &sk->sk_omem_alloc);
2146 mem = kmalloc(size, priority);
2149 atomic_sub(size, &sk->sk_omem_alloc);
2153 EXPORT_SYMBOL(sock_kmalloc);
2155 /* Free an option memory block. Note, we actually want the inline
2156 * here as this allows gcc to detect the nullify and fold away the
2157 * condition entirely.
2159 static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
2162 if (WARN_ON_ONCE(!mem))
2168 atomic_sub(size, &sk->sk_omem_alloc);
2171 void sock_kfree_s(struct sock *sk, void *mem, int size)
2173 __sock_kfree_s(sk, mem, size, false);
2175 EXPORT_SYMBOL(sock_kfree_s);
2177 void sock_kzfree_s(struct sock *sk, void *mem, int size)
2179 __sock_kfree_s(sk, mem, size, true);
2181 EXPORT_SYMBOL(sock_kzfree_s);
2183 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
2184 I think, these locks should be removed for datagram sockets.
2186 static long sock_wait_for_wmem(struct sock *sk, long timeo)
2190 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2194 if (signal_pending(current))
2196 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2197 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2198 if (refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf))
2200 if (sk->sk_shutdown & SEND_SHUTDOWN)
2204 timeo = schedule_timeout(timeo);
2206 finish_wait(sk_sleep(sk), &wait);
2212 * Generic send/receive buffer handlers
2215 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
2216 unsigned long data_len, int noblock,
2217 int *errcode, int max_page_order)
2219 struct sk_buff *skb;
2223 timeo = sock_sndtimeo(sk, noblock);
2225 err = sock_error(sk);
2230 if (sk->sk_shutdown & SEND_SHUTDOWN)
2233 if (sk_wmem_alloc_get(sk) < READ_ONCE(sk->sk_sndbuf))
2236 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2237 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2241 if (signal_pending(current))
2243 timeo = sock_wait_for_wmem(sk, timeo);
2245 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
2246 errcode, sk->sk_allocation);
2248 skb_set_owner_w(skb, sk);
2252 err = sock_intr_errno(timeo);
2257 EXPORT_SYMBOL(sock_alloc_send_pskb);
2259 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
2260 int noblock, int *errcode)
2262 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
2264 EXPORT_SYMBOL(sock_alloc_send_skb);
2266 int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
2267 struct sockcm_cookie *sockc)
2271 switch (cmsg->cmsg_type) {
2273 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2275 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2277 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
2279 case SO_TIMESTAMPING_OLD:
2280 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2283 tsflags = *(u32 *)CMSG_DATA(cmsg);
2284 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
2287 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
2288 sockc->tsflags |= tsflags;
2291 if (!sock_flag(sk, SOCK_TXTIME))
2293 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u64)))
2295 sockc->transmit_time = get_unaligned((u64 *)CMSG_DATA(cmsg));
2297 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
2299 case SCM_CREDENTIALS:
2306 EXPORT_SYMBOL(__sock_cmsg_send);
2308 int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
2309 struct sockcm_cookie *sockc)
2311 struct cmsghdr *cmsg;
2314 for_each_cmsghdr(cmsg, msg) {
2315 if (!CMSG_OK(msg, cmsg))
2317 if (cmsg->cmsg_level != SOL_SOCKET)
2319 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
2325 EXPORT_SYMBOL(sock_cmsg_send);
2327 static void sk_enter_memory_pressure(struct sock *sk)
2329 if (!sk->sk_prot->enter_memory_pressure)
2332 sk->sk_prot->enter_memory_pressure(sk);
2335 static void sk_leave_memory_pressure(struct sock *sk)
2337 if (sk->sk_prot->leave_memory_pressure) {
2338 sk->sk_prot->leave_memory_pressure(sk);
2340 unsigned long *memory_pressure = sk->sk_prot->memory_pressure;
2342 if (memory_pressure && READ_ONCE(*memory_pressure))
2343 WRITE_ONCE(*memory_pressure, 0);
2347 /* On 32bit arches, an skb frag is limited to 2^15 */
2348 #define SKB_FRAG_PAGE_ORDER get_order(32768)
2349 DEFINE_STATIC_KEY_FALSE(net_high_order_alloc_disable_key);
2352 * skb_page_frag_refill - check that a page_frag contains enough room
2353 * @sz: minimum size of the fragment we want to get
2354 * @pfrag: pointer to page_frag
2355 * @gfp: priority for memory allocation
2357 * Note: While this allocator tries to use high order pages, there is
2358 * no guarantee that allocations succeed. Therefore, @sz MUST be
2359 * less or equal than PAGE_SIZE.
2361 bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
2364 if (page_ref_count(pfrag->page) == 1) {
2368 if (pfrag->offset + sz <= pfrag->size)
2370 put_page(pfrag->page);
2374 if (SKB_FRAG_PAGE_ORDER &&
2375 !static_branch_unlikely(&net_high_order_alloc_disable_key)) {
2376 /* Avoid direct reclaim but allow kswapd to wake */
2377 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
2378 __GFP_COMP | __GFP_NOWARN |
2380 SKB_FRAG_PAGE_ORDER);
2381 if (likely(pfrag->page)) {
2382 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
2386 pfrag->page = alloc_page(gfp);
2387 if (likely(pfrag->page)) {
2388 pfrag->size = PAGE_SIZE;
2393 EXPORT_SYMBOL(skb_page_frag_refill);
2395 bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2397 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2400 sk_enter_memory_pressure(sk);
2401 sk_stream_moderate_sndbuf(sk);
2404 EXPORT_SYMBOL(sk_page_frag_refill);
2406 static void __lock_sock(struct sock *sk)
2407 __releases(&sk->sk_lock.slock)
2408 __acquires(&sk->sk_lock.slock)
2413 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2414 TASK_UNINTERRUPTIBLE);
2415 spin_unlock_bh(&sk->sk_lock.slock);
2417 spin_lock_bh(&sk->sk_lock.slock);
2418 if (!sock_owned_by_user(sk))
2421 finish_wait(&sk->sk_lock.wq, &wait);
2424 void __release_sock(struct sock *sk)
2425 __releases(&sk->sk_lock.slock)
2426 __acquires(&sk->sk_lock.slock)
2428 struct sk_buff *skb, *next;
2430 while ((skb = sk->sk_backlog.head) != NULL) {
2431 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
2433 spin_unlock_bh(&sk->sk_lock.slock);
2438 WARN_ON_ONCE(skb_dst_is_noref(skb));
2439 skb_mark_not_on_list(skb);
2440 sk_backlog_rcv(sk, skb);
2445 } while (skb != NULL);
2447 spin_lock_bh(&sk->sk_lock.slock);
2451 * Doing the zeroing here guarantee we can not loop forever
2452 * while a wild producer attempts to flood us.
2454 sk->sk_backlog.len = 0;
2457 void __sk_flush_backlog(struct sock *sk)
2459 spin_lock_bh(&sk->sk_lock.slock);
2461 spin_unlock_bh(&sk->sk_lock.slock);
2465 * sk_wait_data - wait for data to arrive at sk_receive_queue
2466 * @sk: sock to wait on
2467 * @timeo: for how long
2468 * @skb: last skb seen on sk_receive_queue
2470 * Now socket state including sk->sk_err is changed only under lock,
2471 * hence we may omit checks after joining wait queue.
2472 * We check receive queue before schedule() only as optimization;
2473 * it is very likely that release_sock() added new data.
2475 int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
2477 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2480 add_wait_queue(sk_sleep(sk), &wait);
2481 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2482 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
2483 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2484 remove_wait_queue(sk_sleep(sk), &wait);
2487 EXPORT_SYMBOL(sk_wait_data);
2490 * __sk_mem_raise_allocated - increase memory_allocated
2492 * @size: memory size to allocate
2493 * @amt: pages to allocate
2494 * @kind: allocation type
2496 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc
2498 int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
2500 struct proto *prot = sk->sk_prot;
2501 long allocated = sk_memory_allocated_add(sk, amt);
2502 bool charged = true;
2504 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2505 !(charged = mem_cgroup_charge_skmem(sk->sk_memcg, amt)))
2506 goto suppress_allocation;
2509 if (allocated <= sk_prot_mem_limits(sk, 0)) {
2510 sk_leave_memory_pressure(sk);
2514 /* Under pressure. */
2515 if (allocated > sk_prot_mem_limits(sk, 1))
2516 sk_enter_memory_pressure(sk);
2518 /* Over hard limit. */
2519 if (allocated > sk_prot_mem_limits(sk, 2))
2520 goto suppress_allocation;
2522 /* guarantee minimum buffer size under pressure */
2523 if (kind == SK_MEM_RECV) {
2524 if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot))
2527 } else { /* SK_MEM_SEND */
2528 int wmem0 = sk_get_wmem0(sk, prot);
2530 if (sk->sk_type == SOCK_STREAM) {
2531 if (sk->sk_wmem_queued < wmem0)
2533 } else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) {
2538 if (sk_has_memory_pressure(sk)) {
2541 if (!sk_under_memory_pressure(sk))
2543 alloc = sk_sockets_allocated_read_positive(sk);
2544 if (sk_prot_mem_limits(sk, 2) > alloc *
2545 sk_mem_pages(sk->sk_wmem_queued +
2546 atomic_read(&sk->sk_rmem_alloc) +
2547 sk->sk_forward_alloc))
2551 suppress_allocation:
2553 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2554 sk_stream_moderate_sndbuf(sk);
2556 /* Fail only if socket is _under_ its sndbuf.
2557 * In this case we cannot block, so that we have to fail.
2559 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2563 if (kind == SK_MEM_SEND || (kind == SK_MEM_RECV && charged))
2564 trace_sock_exceed_buf_limit(sk, prot, allocated, kind);
2566 sk_memory_allocated_sub(sk, amt);
2568 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2569 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
2573 EXPORT_SYMBOL(__sk_mem_raise_allocated);
2576 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2578 * @size: memory size to allocate
2579 * @kind: allocation type
2581 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2582 * rmem allocation. This function assumes that protocols which have
2583 * memory_pressure use sk_wmem_queued as write buffer accounting.
2585 int __sk_mem_schedule(struct sock *sk, int size, int kind)
2587 int ret, amt = sk_mem_pages(size);
2589 sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT;
2590 ret = __sk_mem_raise_allocated(sk, size, amt, kind);
2592 sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT;
2595 EXPORT_SYMBOL(__sk_mem_schedule);
2598 * __sk_mem_reduce_allocated - reclaim memory_allocated
2600 * @amount: number of quanta
2602 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
2604 void __sk_mem_reduce_allocated(struct sock *sk, int amount)
2606 sk_memory_allocated_sub(sk, amount);
2608 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2609 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
2611 if (sk_under_memory_pressure(sk) &&
2612 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2613 sk_leave_memory_pressure(sk);
2615 EXPORT_SYMBOL(__sk_mem_reduce_allocated);
2618 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
2620 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
2622 void __sk_mem_reclaim(struct sock *sk, int amount)
2624 amount >>= SK_MEM_QUANTUM_SHIFT;
2625 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
2626 __sk_mem_reduce_allocated(sk, amount);
2628 EXPORT_SYMBOL(__sk_mem_reclaim);
2630 int sk_set_peek_off(struct sock *sk, int val)
2632 sk->sk_peek_off = val;
2635 EXPORT_SYMBOL_GPL(sk_set_peek_off);
2638 * Set of default routines for initialising struct proto_ops when
2639 * the protocol does not support a particular function. In certain
2640 * cases where it makes no sense for a protocol to have a "do nothing"
2641 * function, some default processing is provided.
2644 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2648 EXPORT_SYMBOL(sock_no_bind);
2650 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
2655 EXPORT_SYMBOL(sock_no_connect);
2657 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2661 EXPORT_SYMBOL(sock_no_socketpair);
2663 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags,
2668 EXPORT_SYMBOL(sock_no_accept);
2670 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
2675 EXPORT_SYMBOL(sock_no_getname);
2677 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2681 EXPORT_SYMBOL(sock_no_ioctl);
2683 int sock_no_listen(struct socket *sock, int backlog)
2687 EXPORT_SYMBOL(sock_no_listen);
2689 int sock_no_shutdown(struct socket *sock, int how)
2693 EXPORT_SYMBOL(sock_no_shutdown);
2695 int sock_no_setsockopt(struct socket *sock, int level, int optname,
2696 char __user *optval, unsigned int optlen)
2700 EXPORT_SYMBOL(sock_no_setsockopt);
2702 int sock_no_getsockopt(struct socket *sock, int level, int optname,
2703 char __user *optval, int __user *optlen)
2707 EXPORT_SYMBOL(sock_no_getsockopt);
2709 int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
2713 EXPORT_SYMBOL(sock_no_sendmsg);
2715 int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len)
2719 EXPORT_SYMBOL(sock_no_sendmsg_locked);
2721 int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2726 EXPORT_SYMBOL(sock_no_recvmsg);
2728 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2730 /* Mirror missing mmap method error code */
2733 EXPORT_SYMBOL(sock_no_mmap);
2735 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2738 struct msghdr msg = {.msg_flags = flags};
2740 char *kaddr = kmap(page);
2741 iov.iov_base = kaddr + offset;
2743 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2747 EXPORT_SYMBOL(sock_no_sendpage);
2749 ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page,
2750 int offset, size_t size, int flags)
2753 struct msghdr msg = {.msg_flags = flags};
2755 char *kaddr = kmap(page);
2757 iov.iov_base = kaddr + offset;
2759 res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size);
2763 EXPORT_SYMBOL(sock_no_sendpage_locked);
2766 * Default Socket Callbacks
2769 static void sock_def_wakeup(struct sock *sk)
2771 struct socket_wq *wq;
2774 wq = rcu_dereference(sk->sk_wq);
2775 if (skwq_has_sleeper(wq))
2776 wake_up_interruptible_all(&wq->wait);
2780 static void sock_def_error_report(struct sock *sk)
2782 struct socket_wq *wq;
2785 wq = rcu_dereference(sk->sk_wq);
2786 if (skwq_has_sleeper(wq))
2787 wake_up_interruptible_poll(&wq->wait, EPOLLERR);
2788 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2792 void sock_def_readable(struct sock *sk)
2794 struct socket_wq *wq;
2797 wq = rcu_dereference(sk->sk_wq);
2798 if (skwq_has_sleeper(wq))
2799 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
2800 EPOLLRDNORM | EPOLLRDBAND);
2801 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2805 static void sock_def_write_space(struct sock *sk)
2807 struct socket_wq *wq;
2811 /* Do not wake up a writer until he can make "significant"
2814 if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= READ_ONCE(sk->sk_sndbuf)) {
2815 wq = rcu_dereference(sk->sk_wq);
2816 if (skwq_has_sleeper(wq))
2817 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2818 EPOLLWRNORM | EPOLLWRBAND);
2820 /* Should agree with poll, otherwise some programs break */
2821 if (sock_writeable(sk))
2822 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2828 static void sock_def_destruct(struct sock *sk)
2832 void sk_send_sigurg(struct sock *sk)
2834 if (sk->sk_socket && sk->sk_socket->file)
2835 if (send_sigurg(&sk->sk_socket->file->f_owner))
2836 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2838 EXPORT_SYMBOL(sk_send_sigurg);
2840 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2841 unsigned long expires)
2843 if (!mod_timer(timer, expires))
2846 EXPORT_SYMBOL(sk_reset_timer);
2848 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2850 if (del_timer(timer))
2853 EXPORT_SYMBOL(sk_stop_timer);
2855 void sock_init_data(struct socket *sock, struct sock *sk)
2858 sk->sk_send_head = NULL;
2860 timer_setup(&sk->sk_timer, NULL, 0);
2862 sk->sk_allocation = GFP_KERNEL;
2863 sk->sk_rcvbuf = sysctl_rmem_default;
2864 sk->sk_sndbuf = sysctl_wmem_default;
2865 sk->sk_state = TCP_CLOSE;
2866 sk_set_socket(sk, sock);
2868 sock_set_flag(sk, SOCK_ZAPPED);
2871 sk->sk_type = sock->type;
2872 RCU_INIT_POINTER(sk->sk_wq, &sock->wq);
2874 sk->sk_uid = SOCK_INODE(sock)->i_uid;
2876 RCU_INIT_POINTER(sk->sk_wq, NULL);
2877 sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0);
2880 rwlock_init(&sk->sk_callback_lock);
2881 if (sk->sk_kern_sock)
2882 lockdep_set_class_and_name(
2883 &sk->sk_callback_lock,
2884 af_kern_callback_keys + sk->sk_family,
2885 af_family_kern_clock_key_strings[sk->sk_family]);
2887 lockdep_set_class_and_name(
2888 &sk->sk_callback_lock,
2889 af_callback_keys + sk->sk_family,
2890 af_family_clock_key_strings[sk->sk_family]);
2892 sk->sk_state_change = sock_def_wakeup;
2893 sk->sk_data_ready = sock_def_readable;
2894 sk->sk_write_space = sock_def_write_space;
2895 sk->sk_error_report = sock_def_error_report;
2896 sk->sk_destruct = sock_def_destruct;
2898 sk->sk_frag.page = NULL;
2899 sk->sk_frag.offset = 0;
2900 sk->sk_peek_off = -1;
2902 sk->sk_peer_pid = NULL;
2903 sk->sk_peer_cred = NULL;
2904 sk->sk_write_pending = 0;
2905 sk->sk_rcvlowat = 1;
2906 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2907 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2909 sk->sk_stamp = SK_DEFAULT_STAMP;
2910 #if BITS_PER_LONG==32
2911 seqlock_init(&sk->sk_stamp_seq);
2913 atomic_set(&sk->sk_zckey, 0);
2915 #ifdef CONFIG_NET_RX_BUSY_POLL
2917 sk->sk_ll_usec = sysctl_net_busy_read;
2920 sk->sk_max_pacing_rate = ~0UL;
2921 sk->sk_pacing_rate = ~0UL;
2922 WRITE_ONCE(sk->sk_pacing_shift, 10);
2923 sk->sk_incoming_cpu = -1;
2925 sk_rx_queue_clear(sk);
2927 * Before updating sk_refcnt, we must commit prior changes to memory
2928 * (Documentation/RCU/rculist_nulls.txt for details)
2931 refcount_set(&sk->sk_refcnt, 1);
2932 atomic_set(&sk->sk_drops, 0);
2934 EXPORT_SYMBOL(sock_init_data);
2936 void lock_sock_nested(struct sock *sk, int subclass)
2939 spin_lock_bh(&sk->sk_lock.slock);
2940 if (sk->sk_lock.owned)
2942 sk->sk_lock.owned = 1;
2943 spin_unlock(&sk->sk_lock.slock);
2945 * The sk_lock has mutex_lock() semantics here:
2947 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2950 EXPORT_SYMBOL(lock_sock_nested);
2952 void release_sock(struct sock *sk)
2954 spin_lock_bh(&sk->sk_lock.slock);
2955 if (sk->sk_backlog.tail)
2958 /* Warning : release_cb() might need to release sk ownership,
2959 * ie call sock_release_ownership(sk) before us.
2961 if (sk->sk_prot->release_cb)
2962 sk->sk_prot->release_cb(sk);
2964 sock_release_ownership(sk);
2965 if (waitqueue_active(&sk->sk_lock.wq))
2966 wake_up(&sk->sk_lock.wq);
2967 spin_unlock_bh(&sk->sk_lock.slock);
2969 EXPORT_SYMBOL(release_sock);
2972 * lock_sock_fast - fast version of lock_sock
2975 * This version should be used for very small section, where process wont block
2976 * return false if fast path is taken:
2978 * sk_lock.slock locked, owned = 0, BH disabled
2980 * return true if slow path is taken:
2982 * sk_lock.slock unlocked, owned = 1, BH enabled
2984 bool lock_sock_fast(struct sock *sk)
2987 spin_lock_bh(&sk->sk_lock.slock);
2989 if (!sk->sk_lock.owned)
2991 * Note : We must disable BH
2996 sk->sk_lock.owned = 1;
2997 spin_unlock(&sk->sk_lock.slock);
2999 * The sk_lock has mutex_lock() semantics here:
3001 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
3005 EXPORT_SYMBOL(lock_sock_fast);
3007 int sock_gettstamp(struct socket *sock, void __user *userstamp,
3008 bool timeval, bool time32)
3010 struct sock *sk = sock->sk;
3011 struct timespec64 ts;
3013 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
3014 ts = ktime_to_timespec64(sock_read_timestamp(sk));
3015 if (ts.tv_sec == -1)
3017 if (ts.tv_sec == 0) {
3018 ktime_t kt = ktime_get_real();
3019 sock_write_timestamp(sk, kt);
3020 ts = ktime_to_timespec64(kt);
3026 #ifdef CONFIG_COMPAT_32BIT_TIME
3028 return put_old_timespec32(&ts, userstamp);
3030 #ifdef CONFIG_SPARC64
3031 /* beware of padding in sparc64 timeval */
3032 if (timeval && !in_compat_syscall()) {
3033 struct __kernel_old_timeval __user tv = {
3034 .tv_sec = ts.tv_sec,
3035 .tv_usec = ts.tv_nsec,
3037 if (copy_to_user(userstamp, &tv, sizeof(tv)))
3042 return put_timespec64(&ts, userstamp);
3044 EXPORT_SYMBOL(sock_gettstamp);
3046 void sock_enable_timestamp(struct sock *sk, enum sock_flags flag)
3048 if (!sock_flag(sk, flag)) {
3049 unsigned long previous_flags = sk->sk_flags;
3051 sock_set_flag(sk, flag);
3053 * we just set one of the two flags which require net
3054 * time stamping, but time stamping might have been on
3055 * already because of the other one
3057 if (sock_needs_netstamp(sk) &&
3058 !(previous_flags & SK_FLAGS_TIMESTAMP))
3059 net_enable_timestamp();
3063 int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
3064 int level, int type)
3066 struct sock_exterr_skb *serr;
3067 struct sk_buff *skb;
3071 skb = sock_dequeue_err_skb(sk);
3077 msg->msg_flags |= MSG_TRUNC;
3080 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3084 sock_recv_timestamp(msg, sk, skb);
3086 serr = SKB_EXT_ERR(skb);
3087 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
3089 msg->msg_flags |= MSG_ERRQUEUE;
3097 EXPORT_SYMBOL(sock_recv_errqueue);
3100 * Get a socket option on an socket.
3102 * FIX: POSIX 1003.1g is very ambiguous here. It states that
3103 * asynchronous errors should be reported by getsockopt. We assume
3104 * this means if you specify SO_ERROR (otherwise whats the point of it).
3106 int sock_common_getsockopt(struct socket *sock, int level, int optname,
3107 char __user *optval, int __user *optlen)
3109 struct sock *sk = sock->sk;
3111 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
3113 EXPORT_SYMBOL(sock_common_getsockopt);
3115 #ifdef CONFIG_COMPAT
3116 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
3117 char __user *optval, int __user *optlen)
3119 struct sock *sk = sock->sk;
3121 if (sk->sk_prot->compat_getsockopt != NULL)
3122 return sk->sk_prot->compat_getsockopt(sk, level, optname,
3124 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
3126 EXPORT_SYMBOL(compat_sock_common_getsockopt);
3129 int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
3132 struct sock *sk = sock->sk;
3136 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
3137 flags & ~MSG_DONTWAIT, &addr_len);
3139 msg->msg_namelen = addr_len;
3142 EXPORT_SYMBOL(sock_common_recvmsg);
3145 * Set socket options on an inet socket.
3147 int sock_common_setsockopt(struct socket *sock, int level, int optname,
3148 char __user *optval, unsigned int optlen)
3150 struct sock *sk = sock->sk;
3152 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
3154 EXPORT_SYMBOL(sock_common_setsockopt);
3156 #ifdef CONFIG_COMPAT
3157 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
3158 char __user *optval, unsigned int optlen)
3160 struct sock *sk = sock->sk;
3162 if (sk->sk_prot->compat_setsockopt != NULL)
3163 return sk->sk_prot->compat_setsockopt(sk, level, optname,
3165 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
3167 EXPORT_SYMBOL(compat_sock_common_setsockopt);
3170 void sk_common_release(struct sock *sk)
3172 if (sk->sk_prot->destroy)
3173 sk->sk_prot->destroy(sk);
3176 * Observation: when sock_common_release is called, processes have
3177 * no access to socket. But net still has.
3178 * Step one, detach it from networking:
3180 * A. Remove from hash tables.
3183 sk->sk_prot->unhash(sk);
3186 * In this point socket cannot receive new packets, but it is possible
3187 * that some packets are in flight because some CPU runs receiver and
3188 * did hash table lookup before we unhashed socket. They will achieve
3189 * receive queue and will be purged by socket destructor.
3191 * Also we still have packets pending on receive queue and probably,
3192 * our own packets waiting in device queues. sock_destroy will drain
3193 * receive queue, but transmitted packets will delay socket destruction
3194 * until the last reference will be released.
3199 xfrm_sk_free_policy(sk);
3201 sk_refcnt_debug_release(sk);
3205 EXPORT_SYMBOL(sk_common_release);
3207 void sk_get_meminfo(const struct sock *sk, u32 *mem)
3209 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
3211 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
3212 mem[SK_MEMINFO_RCVBUF] = READ_ONCE(sk->sk_rcvbuf);
3213 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
3214 mem[SK_MEMINFO_SNDBUF] = READ_ONCE(sk->sk_sndbuf);
3215 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
3216 mem[SK_MEMINFO_WMEM_QUEUED] = READ_ONCE(sk->sk_wmem_queued);
3217 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
3218 mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len);
3219 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
3222 #ifdef CONFIG_PROC_FS
3223 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
3225 int val[PROTO_INUSE_NR];
3228 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
3230 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
3232 __this_cpu_add(net->core.prot_inuse->val[prot->inuse_idx], val);
3234 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
3236 int sock_prot_inuse_get(struct net *net, struct proto *prot)
3238 int cpu, idx = prot->inuse_idx;
3241 for_each_possible_cpu(cpu)
3242 res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx];
3244 return res >= 0 ? res : 0;
3246 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
3248 static void sock_inuse_add(struct net *net, int val)
3250 this_cpu_add(*net->core.sock_inuse, val);
3253 int sock_inuse_get(struct net *net)
3257 for_each_possible_cpu(cpu)
3258 res += *per_cpu_ptr(net->core.sock_inuse, cpu);
3263 EXPORT_SYMBOL_GPL(sock_inuse_get);
3265 static int __net_init sock_inuse_init_net(struct net *net)
3267 net->core.prot_inuse = alloc_percpu(struct prot_inuse);
3268 if (net->core.prot_inuse == NULL)
3271 net->core.sock_inuse = alloc_percpu(int);
3272 if (net->core.sock_inuse == NULL)
3278 free_percpu(net->core.prot_inuse);
3282 static void __net_exit sock_inuse_exit_net(struct net *net)
3284 free_percpu(net->core.prot_inuse);
3285 free_percpu(net->core.sock_inuse);
3288 static struct pernet_operations net_inuse_ops = {
3289 .init = sock_inuse_init_net,
3290 .exit = sock_inuse_exit_net,
3293 static __init int net_inuse_init(void)
3295 if (register_pernet_subsys(&net_inuse_ops))
3296 panic("Cannot initialize net inuse counters");
3301 core_initcall(net_inuse_init);
3303 static int assign_proto_idx(struct proto *prot)
3305 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
3307 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
3308 pr_err("PROTO_INUSE_NR exhausted\n");
3312 set_bit(prot->inuse_idx, proto_inuse_idx);
3316 static void release_proto_idx(struct proto *prot)
3318 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
3319 clear_bit(prot->inuse_idx, proto_inuse_idx);
3322 static inline int assign_proto_idx(struct proto *prot)
3327 static inline void release_proto_idx(struct proto *prot)
3331 static void sock_inuse_add(struct net *net, int val)
3336 static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
3340 kfree(rsk_prot->slab_name);
3341 rsk_prot->slab_name = NULL;
3342 kmem_cache_destroy(rsk_prot->slab);
3343 rsk_prot->slab = NULL;
3346 static int req_prot_init(const struct proto *prot)
3348 struct request_sock_ops *rsk_prot = prot->rsk_prot;
3353 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
3355 if (!rsk_prot->slab_name)
3358 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
3359 rsk_prot->obj_size, 0,
3360 SLAB_ACCOUNT | prot->slab_flags,
3363 if (!rsk_prot->slab) {
3364 pr_crit("%s: Can't create request sock SLAB cache!\n",
3371 int proto_register(struct proto *prot, int alloc_slab)
3376 prot->slab = kmem_cache_create_usercopy(prot->name,
3378 SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT |
3380 prot->useroffset, prot->usersize,
3383 if (prot->slab == NULL) {
3384 pr_crit("%s: Can't create sock SLAB cache!\n",
3389 if (req_prot_init(prot))
3390 goto out_free_request_sock_slab;
3392 if (prot->twsk_prot != NULL) {
3393 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
3395 if (prot->twsk_prot->twsk_slab_name == NULL)
3396 goto out_free_request_sock_slab;
3398 prot->twsk_prot->twsk_slab =
3399 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
3400 prot->twsk_prot->twsk_obj_size,
3405 if (prot->twsk_prot->twsk_slab == NULL)
3406 goto out_free_timewait_sock_slab_name;
3410 mutex_lock(&proto_list_mutex);
3411 ret = assign_proto_idx(prot);
3413 mutex_unlock(&proto_list_mutex);
3414 goto out_free_timewait_sock_slab_name;
3416 list_add(&prot->node, &proto_list);
3417 mutex_unlock(&proto_list_mutex);
3420 out_free_timewait_sock_slab_name:
3421 if (alloc_slab && prot->twsk_prot)
3422 kfree(prot->twsk_prot->twsk_slab_name);
3423 out_free_request_sock_slab:
3425 req_prot_cleanup(prot->rsk_prot);
3427 kmem_cache_destroy(prot->slab);
3433 EXPORT_SYMBOL(proto_register);
3435 void proto_unregister(struct proto *prot)
3437 mutex_lock(&proto_list_mutex);
3438 release_proto_idx(prot);
3439 list_del(&prot->node);
3440 mutex_unlock(&proto_list_mutex);
3442 kmem_cache_destroy(prot->slab);
3445 req_prot_cleanup(prot->rsk_prot);
3447 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
3448 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
3449 kfree(prot->twsk_prot->twsk_slab_name);
3450 prot->twsk_prot->twsk_slab = NULL;
3453 EXPORT_SYMBOL(proto_unregister);
3455 int sock_load_diag_module(int family, int protocol)
3458 if (!sock_is_registered(family))
3461 return request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
3462 NETLINK_SOCK_DIAG, family);
3466 if (family == AF_INET &&
3467 protocol != IPPROTO_RAW &&
3468 !rcu_access_pointer(inet_protos[protocol]))
3472 return request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
3473 NETLINK_SOCK_DIAG, family, protocol);
3475 EXPORT_SYMBOL(sock_load_diag_module);
3477 #ifdef CONFIG_PROC_FS
3478 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
3479 __acquires(proto_list_mutex)
3481 mutex_lock(&proto_list_mutex);
3482 return seq_list_start_head(&proto_list, *pos);
3485 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3487 return seq_list_next(v, &proto_list, pos);
3490 static void proto_seq_stop(struct seq_file *seq, void *v)
3491 __releases(proto_list_mutex)
3493 mutex_unlock(&proto_list_mutex);
3496 static char proto_method_implemented(const void *method)
3498 return method == NULL ? 'n' : 'y';
3500 static long sock_prot_memory_allocated(struct proto *proto)
3502 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
3505 static const char *sock_prot_memory_pressure(struct proto *proto)
3507 return proto->memory_pressure != NULL ?
3508 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
3511 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
3514 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
3515 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3518 sock_prot_inuse_get(seq_file_net(seq), proto),
3519 sock_prot_memory_allocated(proto),
3520 sock_prot_memory_pressure(proto),
3522 proto->slab == NULL ? "no" : "yes",
3523 module_name(proto->owner),
3524 proto_method_implemented(proto->close),
3525 proto_method_implemented(proto->connect),
3526 proto_method_implemented(proto->disconnect),
3527 proto_method_implemented(proto->accept),
3528 proto_method_implemented(proto->ioctl),
3529 proto_method_implemented(proto->init),
3530 proto_method_implemented(proto->destroy),
3531 proto_method_implemented(proto->shutdown),
3532 proto_method_implemented(proto->setsockopt),
3533 proto_method_implemented(proto->getsockopt),
3534 proto_method_implemented(proto->sendmsg),
3535 proto_method_implemented(proto->recvmsg),
3536 proto_method_implemented(proto->sendpage),
3537 proto_method_implemented(proto->bind),
3538 proto_method_implemented(proto->backlog_rcv),
3539 proto_method_implemented(proto->hash),
3540 proto_method_implemented(proto->unhash),
3541 proto_method_implemented(proto->get_port),
3542 proto_method_implemented(proto->enter_memory_pressure));
3545 static int proto_seq_show(struct seq_file *seq, void *v)
3547 if (v == &proto_list)
3548 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3557 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3559 proto_seq_printf(seq, list_entry(v, struct proto, node));
3563 static const struct seq_operations proto_seq_ops = {
3564 .start = proto_seq_start,
3565 .next = proto_seq_next,
3566 .stop = proto_seq_stop,
3567 .show = proto_seq_show,
3570 static __net_init int proto_init_net(struct net *net)
3572 if (!proc_create_net("protocols", 0444, net->proc_net, &proto_seq_ops,
3573 sizeof(struct seq_net_private)))
3579 static __net_exit void proto_exit_net(struct net *net)
3581 remove_proc_entry("protocols", net->proc_net);
3585 static __net_initdata struct pernet_operations proto_net_ops = {
3586 .init = proto_init_net,
3587 .exit = proto_exit_net,
3590 static int __init proto_init(void)
3592 return register_pernet_subsys(&proto_net_ops);
3595 subsys_initcall(proto_init);
3597 #endif /* PROC_FS */
3599 #ifdef CONFIG_NET_RX_BUSY_POLL
3600 bool sk_busy_loop_end(void *p, unsigned long start_time)
3602 struct sock *sk = p;
3604 return !skb_queue_empty_lockless(&sk->sk_receive_queue) ||
3605 sk_busy_loop_timeout(sk, start_time);
3607 EXPORT_SYMBOL(sk_busy_loop_end);
3608 #endif /* CONFIG_NET_RX_BUSY_POLL */