2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
35 * code. The ACK stuff can wait and needs major
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
92 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
94 #include <linux/capability.h>
95 #include <linux/errno.h>
96 #include <linux/errqueue.h>
97 #include <linux/types.h>
98 #include <linux/socket.h>
100 #include <linux/kernel.h>
101 #include <linux/module.h>
102 #include <linux/proc_fs.h>
103 #include <linux/seq_file.h>
104 #include <linux/sched.h>
105 #include <linux/timer.h>
106 #include <linux/string.h>
107 #include <linux/sockios.h>
108 #include <linux/net.h>
109 #include <linux/mm.h>
110 #include <linux/slab.h>
111 #include <linux/interrupt.h>
112 #include <linux/poll.h>
113 #include <linux/tcp.h>
114 #include <linux/init.h>
115 #include <linux/highmem.h>
116 #include <linux/user_namespace.h>
117 #include <linux/static_key.h>
118 #include <linux/memcontrol.h>
119 #include <linux/prefetch.h>
121 #include <asm/uaccess.h>
123 #include <linux/netdevice.h>
124 #include <net/protocol.h>
125 #include <linux/skbuff.h>
126 #include <net/net_namespace.h>
127 #include <net/request_sock.h>
128 #include <net/sock.h>
129 #include <linux/net_tstamp.h>
130 #include <net/xfrm.h>
131 #include <linux/ipsec.h>
132 #include <net/cls_cgroup.h>
133 #include <net/netprio_cgroup.h>
134 #include <linux/sock_diag.h>
136 #include <linux/filter.h>
137 #include <net/sock_reuseport.h>
139 #include <trace/events/sock.h>
145 #include <net/busy_poll.h>
147 static DEFINE_MUTEX(proto_list_mutex);
148 static LIST_HEAD(proto_list);
151 * sk_ns_capable - General socket capability test
152 * @sk: Socket to use a capability on or through
153 * @user_ns: The user namespace of the capability to use
154 * @cap: The capability to use
156 * Test to see if the opener of the socket had when the socket was
157 * created and the current process has the capability @cap in the user
158 * namespace @user_ns.
160 bool sk_ns_capable(const struct sock *sk,
161 struct user_namespace *user_ns, int cap)
163 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
164 ns_capable(user_ns, cap);
166 EXPORT_SYMBOL(sk_ns_capable);
169 * sk_capable - Socket global capability test
170 * @sk: Socket to use a capability on or through
171 * @cap: The global capability to use
173 * Test to see if the opener of the socket had when the socket was
174 * created and the current process has the capability @cap in all user
177 bool sk_capable(const struct sock *sk, int cap)
179 return sk_ns_capable(sk, &init_user_ns, cap);
181 EXPORT_SYMBOL(sk_capable);
184 * sk_net_capable - Network namespace socket capability test
185 * @sk: Socket to use a capability on or through
186 * @cap: The capability to use
188 * Test to see if the opener of the socket had when the socket was created
189 * and the current process has the capability @cap over the network namespace
190 * the socket is a member of.
192 bool sk_net_capable(const struct sock *sk, int cap)
194 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
196 EXPORT_SYMBOL(sk_net_capable);
199 #ifdef CONFIG_MEMCG_KMEM
200 int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
205 mutex_lock(&proto_list_mutex);
206 list_for_each_entry(proto, &proto_list, node) {
207 if (proto->init_cgroup) {
208 ret = proto->init_cgroup(memcg, ss);
214 mutex_unlock(&proto_list_mutex);
217 list_for_each_entry_continue_reverse(proto, &proto_list, node)
218 if (proto->destroy_cgroup)
219 proto->destroy_cgroup(memcg);
220 mutex_unlock(&proto_list_mutex);
224 void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
228 mutex_lock(&proto_list_mutex);
229 list_for_each_entry_reverse(proto, &proto_list, node)
230 if (proto->destroy_cgroup)
231 proto->destroy_cgroup(memcg);
232 mutex_unlock(&proto_list_mutex);
237 * Each address family might have different locking rules, so we have
238 * one slock key per address family:
240 static struct lock_class_key af_family_keys[AF_MAX];
241 static struct lock_class_key af_family_slock_keys[AF_MAX];
243 #if defined(CONFIG_MEMCG_KMEM)
244 struct static_key memcg_socket_limit_enabled;
245 EXPORT_SYMBOL(memcg_socket_limit_enabled);
249 * Make lock validator output more readable. (we pre-construct these
250 * strings build-time, so that runtime initialization of socket
253 static const char *const af_family_key_strings[AF_MAX+1] = {
254 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
255 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
256 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
257 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
258 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
259 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
260 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
261 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
262 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
263 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
264 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
265 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
266 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
267 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX"
269 static const char *const af_family_slock_key_strings[AF_MAX+1] = {
270 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
271 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
272 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
273 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
274 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
275 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
276 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
277 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
278 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
279 "slock-27" , "slock-28" , "slock-AF_CAN" ,
280 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
281 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
282 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
283 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX"
285 static const char *const af_family_clock_key_strings[AF_MAX+1] = {
286 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
287 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
288 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
289 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
290 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
291 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
292 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
293 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
294 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
295 "clock-27" , "clock-28" , "clock-AF_CAN" ,
296 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
297 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
298 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
299 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX"
303 * sk_callback_lock locking rules are per-address-family,
304 * so split the lock classes by using a per-AF key:
306 static struct lock_class_key af_callback_keys[AF_MAX];
308 /* Take into consideration the size of the struct sk_buff overhead in the
309 * determination of these values, since that is non-constant across
310 * platforms. This makes socket queueing behavior and performance
311 * not depend upon such differences.
313 #define _SK_MEM_PACKETS 256
314 #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
315 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
316 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
318 /* Run time adjustable parameters. */
319 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
320 EXPORT_SYMBOL(sysctl_wmem_max);
321 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
322 EXPORT_SYMBOL(sysctl_rmem_max);
323 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
324 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
326 /* Maximal space eaten by iovec or ancillary data plus some space */
327 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
328 EXPORT_SYMBOL(sysctl_optmem_max);
330 int sysctl_tstamp_allow_data __read_mostly = 1;
332 struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
333 EXPORT_SYMBOL_GPL(memalloc_socks);
336 * sk_set_memalloc - sets %SOCK_MEMALLOC
337 * @sk: socket to set it on
339 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
340 * It's the responsibility of the admin to adjust min_free_kbytes
341 * to meet the requirements
343 void sk_set_memalloc(struct sock *sk)
345 sock_set_flag(sk, SOCK_MEMALLOC);
346 sk->sk_allocation |= __GFP_MEMALLOC;
347 static_key_slow_inc(&memalloc_socks);
349 EXPORT_SYMBOL_GPL(sk_set_memalloc);
351 void sk_clear_memalloc(struct sock *sk)
353 sock_reset_flag(sk, SOCK_MEMALLOC);
354 sk->sk_allocation &= ~__GFP_MEMALLOC;
355 static_key_slow_dec(&memalloc_socks);
358 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
359 * progress of swapping. SOCK_MEMALLOC may be cleared while
360 * it has rmem allocations due to the last swapfile being deactivated
361 * but there is a risk that the socket is unusable due to exceeding
362 * the rmem limits. Reclaim the reserves and obey rmem limits again.
366 EXPORT_SYMBOL_GPL(sk_clear_memalloc);
368 int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
371 unsigned long pflags = current->flags;
373 /* these should have been dropped before queueing */
374 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
376 current->flags |= PF_MEMALLOC;
377 ret = sk->sk_backlog_rcv(sk, skb);
378 tsk_restore_flags(current, pflags, PF_MEMALLOC);
382 EXPORT_SYMBOL(__sk_backlog_rcv);
384 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
388 if (optlen < sizeof(tv))
390 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 + (tv.tv_usec+(1000000/HZ-1))/(1000000/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)
452 struct sk_buff_head *list = &sk->sk_receive_queue;
454 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
455 atomic_inc(&sk->sk_drops);
456 trace_sock_rcvqueue_full(sk, skb);
460 err = sk_filter(sk, skb);
464 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
465 atomic_inc(&sk->sk_drops);
470 skb_set_owner_r(skb, sk);
472 /* we escape from rcu protected region, make sure we dont leak
477 spin_lock_irqsave(&list->lock, flags);
478 sock_skb_set_dropcount(sk, skb);
479 __skb_queue_tail(list, skb);
480 spin_unlock_irqrestore(&list->lock, flags);
482 if (!sock_flag(sk, SOCK_DEAD))
483 sk->sk_data_ready(sk);
486 EXPORT_SYMBOL(sock_queue_rcv_skb);
488 int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
490 int rc = NET_RX_SUCCESS;
492 if (sk_filter(sk, skb))
493 goto discard_and_relse;
497 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
498 atomic_inc(&sk->sk_drops);
499 goto discard_and_relse;
502 bh_lock_sock_nested(sk);
505 if (!sock_owned_by_user(sk)) {
507 * trylock + unlock semantics:
509 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
511 rc = sk_backlog_rcv(sk, skb);
513 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
514 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
516 atomic_inc(&sk->sk_drops);
517 goto discard_and_relse;
528 EXPORT_SYMBOL(sk_receive_skb);
530 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
532 struct dst_entry *dst = __sk_dst_get(sk);
534 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
535 sk_tx_queue_clear(sk);
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_setbindtodevice(struct sock *sk, char __user *optval,
562 int ret = -ENOPROTOOPT;
563 #ifdef CONFIG_NETDEVICES
564 struct net *net = sock_net(sk);
565 char devname[IFNAMSIZ];
570 if (!ns_capable(net->user_ns, CAP_NET_RAW))
577 /* Bind this socket to a particular device like "eth0",
578 * as specified in the passed interface name. If the
579 * name is "" or the option length is zero the socket
582 if (optlen > IFNAMSIZ - 1)
583 optlen = IFNAMSIZ - 1;
584 memset(devname, 0, sizeof(devname));
587 if (copy_from_user(devname, optval, optlen))
591 if (devname[0] != '\0') {
592 struct net_device *dev;
595 dev = dev_get_by_name_rcu(net, devname);
597 index = dev->ifindex;
605 sk->sk_bound_dev_if = index;
617 static int sock_getbindtodevice(struct sock *sk, char __user *optval,
618 int __user *optlen, int len)
620 int ret = -ENOPROTOOPT;
621 #ifdef CONFIG_NETDEVICES
622 struct net *net = sock_net(sk);
623 char devname[IFNAMSIZ];
625 if (sk->sk_bound_dev_if == 0) {
634 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
638 len = strlen(devname) + 1;
641 if (copy_to_user(optval, devname, len))
646 if (put_user(len, optlen))
657 static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
660 sock_set_flag(sk, bit);
662 sock_reset_flag(sk, bit);
665 bool sk_mc_loop(struct sock *sk)
667 if (dev_recursion_level())
671 switch (sk->sk_family) {
673 return inet_sk(sk)->mc_loop;
674 #if IS_ENABLED(CONFIG_IPV6)
676 return inet6_sk(sk)->mc_loop;
682 EXPORT_SYMBOL(sk_mc_loop);
685 * This is meant for all protocols to use and covers goings on
686 * at the socket level. Everything here is generic.
689 int sock_setsockopt(struct socket *sock, int level, int optname,
690 char __user *optval, unsigned int optlen)
692 struct sock *sk = sock->sk;
699 * Options without arguments
702 if (optname == SO_BINDTODEVICE)
703 return sock_setbindtodevice(sk, optval, optlen);
705 if (optlen < sizeof(int))
708 if (get_user(val, (int __user *)optval))
711 valbool = val ? 1 : 0;
717 if (val && !capable(CAP_NET_ADMIN))
720 sock_valbool_flag(sk, SOCK_DBG, valbool);
723 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
726 sk->sk_reuseport = valbool;
735 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
738 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
741 /* Don't error on this BSD doesn't and if you think
742 * about it this is right. Otherwise apps have to
743 * play 'guess the biggest size' games. RCVBUF/SNDBUF
744 * are treated in BSD as hints
746 val = min_t(u32, val, sysctl_wmem_max);
748 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
749 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
750 /* Wake up sending tasks if we upped the value. */
751 sk->sk_write_space(sk);
755 if (!capable(CAP_NET_ADMIN)) {
762 /* Don't error on this BSD doesn't and if you think
763 * about it this is right. Otherwise apps have to
764 * play 'guess the biggest size' games. RCVBUF/SNDBUF
765 * are treated in BSD as hints
767 val = min_t(u32, val, sysctl_rmem_max);
769 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
771 * We double it on the way in to account for
772 * "struct sk_buff" etc. overhead. Applications
773 * assume that the SO_RCVBUF setting they make will
774 * allow that much actual data to be received on that
777 * Applications are unaware that "struct sk_buff" and
778 * other overheads allocate from the receive buffer
779 * during socket buffer allocation.
781 * And after considering the possible alternatives,
782 * returning the value we actually used in getsockopt
783 * is the most desirable behavior.
785 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
789 if (!capable(CAP_NET_ADMIN)) {
797 if (sk->sk_protocol == IPPROTO_TCP &&
798 sk->sk_type == SOCK_STREAM)
799 tcp_set_keepalive(sk, valbool);
801 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
805 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
809 sk->sk_no_check_tx = valbool;
813 if ((val >= 0 && val <= 6) ||
814 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
815 sk->sk_priority = val;
821 if (optlen < sizeof(ling)) {
822 ret = -EINVAL; /* 1003.1g */
825 if (copy_from_user(&ling, optval, sizeof(ling))) {
830 sock_reset_flag(sk, SOCK_LINGER);
832 #if (BITS_PER_LONG == 32)
833 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
834 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
837 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
838 sock_set_flag(sk, SOCK_LINGER);
843 sock_warn_obsolete_bsdism("setsockopt");
848 set_bit(SOCK_PASSCRED, &sock->flags);
850 clear_bit(SOCK_PASSCRED, &sock->flags);
856 if (optname == SO_TIMESTAMP)
857 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
859 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
860 sock_set_flag(sk, SOCK_RCVTSTAMP);
861 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
863 sock_reset_flag(sk, SOCK_RCVTSTAMP);
864 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
868 case SO_TIMESTAMPING:
869 if (val & ~SOF_TIMESTAMPING_MASK) {
874 if (val & SOF_TIMESTAMPING_OPT_ID &&
875 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
876 if (sk->sk_protocol == IPPROTO_TCP &&
877 sk->sk_type == SOCK_STREAM) {
878 if (sk->sk_state != TCP_ESTABLISHED) {
882 sk->sk_tskey = tcp_sk(sk)->snd_una;
887 sk->sk_tsflags = val;
888 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
889 sock_enable_timestamp(sk,
890 SOCK_TIMESTAMPING_RX_SOFTWARE);
892 sock_disable_timestamp(sk,
893 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
899 sk->sk_rcvlowat = val ? : 1;
903 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
907 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
910 case SO_ATTACH_FILTER:
912 if (optlen == sizeof(struct sock_fprog)) {
913 struct sock_fprog fprog;
916 if (copy_from_user(&fprog, optval, sizeof(fprog)))
919 ret = sk_attach_filter(&fprog, sk);
925 if (optlen == sizeof(u32)) {
929 if (copy_from_user(&ufd, optval, sizeof(ufd)))
932 ret = sk_attach_bpf(ufd, sk);
936 case SO_ATTACH_REUSEPORT_CBPF:
938 if (optlen == sizeof(struct sock_fprog)) {
939 struct sock_fprog fprog;
942 if (copy_from_user(&fprog, optval, sizeof(fprog)))
945 ret = sk_reuseport_attach_filter(&fprog, sk);
949 case SO_ATTACH_REUSEPORT_EBPF:
951 if (optlen == sizeof(u32)) {
955 if (copy_from_user(&ufd, optval, sizeof(ufd)))
958 ret = sk_reuseport_attach_bpf(ufd, sk);
962 case SO_DETACH_FILTER:
963 ret = sk_detach_filter(sk);
967 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
970 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
975 set_bit(SOCK_PASSSEC, &sock->flags);
977 clear_bit(SOCK_PASSSEC, &sock->flags);
980 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
987 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
991 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
995 if (sock->ops->set_peek_off)
996 ret = sock->ops->set_peek_off(sk, val);
1002 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
1005 case SO_SELECT_ERR_QUEUE:
1006 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
1009 #ifdef CONFIG_NET_RX_BUSY_POLL
1011 /* allow unprivileged users to decrease the value */
1012 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
1018 sk->sk_ll_usec = val;
1023 case SO_MAX_PACING_RATE:
1024 sk->sk_max_pacing_rate = val;
1025 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
1026 sk->sk_max_pacing_rate);
1029 case SO_INCOMING_CPU:
1030 sk->sk_incoming_cpu = val;
1040 EXPORT_SYMBOL(sock_setsockopt);
1043 static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1044 struct ucred *ucred)
1046 ucred->pid = pid_vnr(pid);
1047 ucred->uid = ucred->gid = -1;
1049 struct user_namespace *current_ns = current_user_ns();
1051 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1052 ucred->gid = from_kgid_munged(current_ns, cred->egid);
1056 int sock_getsockopt(struct socket *sock, int level, int optname,
1057 char __user *optval, int __user *optlen)
1059 struct sock *sk = sock->sk;
1067 int lv = sizeof(int);
1070 if (get_user(len, optlen))
1075 memset(&v, 0, sizeof(v));
1079 v.val = sock_flag(sk, SOCK_DBG);
1083 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1087 v.val = sock_flag(sk, SOCK_BROADCAST);
1091 v.val = sk->sk_sndbuf;
1095 v.val = sk->sk_rcvbuf;
1099 v.val = sk->sk_reuse;
1103 v.val = sk->sk_reuseport;
1107 v.val = sock_flag(sk, SOCK_KEEPOPEN);
1111 v.val = sk->sk_type;
1115 v.val = sk->sk_protocol;
1119 v.val = sk->sk_family;
1123 v.val = -sock_error(sk);
1125 v.val = xchg(&sk->sk_err_soft, 0);
1129 v.val = sock_flag(sk, SOCK_URGINLINE);
1133 v.val = sk->sk_no_check_tx;
1137 v.val = sk->sk_priority;
1141 lv = sizeof(v.ling);
1142 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
1143 v.ling.l_linger = sk->sk_lingertime / HZ;
1147 sock_warn_obsolete_bsdism("getsockopt");
1151 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1152 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1155 case SO_TIMESTAMPNS:
1156 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
1159 case SO_TIMESTAMPING:
1160 v.val = sk->sk_tsflags;
1164 lv = sizeof(struct timeval);
1165 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1169 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1170 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1175 lv = sizeof(struct timeval);
1176 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1180 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1181 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1186 v.val = sk->sk_rcvlowat;
1194 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1199 struct ucred peercred;
1200 if (len > sizeof(peercred))
1201 len = sizeof(peercred);
1202 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1203 if (copy_to_user(optval, &peercred, len))
1212 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1216 if (copy_to_user(optval, address, len))
1221 /* Dubious BSD thing... Probably nobody even uses it, but
1222 * the UNIX standard wants it for whatever reason... -DaveM
1225 v.val = sk->sk_state == TCP_LISTEN;
1229 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1233 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1236 v.val = sk->sk_mark;
1240 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1243 case SO_WIFI_STATUS:
1244 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1248 if (!sock->ops->set_peek_off)
1251 v.val = sk->sk_peek_off;
1254 v.val = sock_flag(sk, SOCK_NOFCS);
1257 case SO_BINDTODEVICE:
1258 return sock_getbindtodevice(sk, optval, optlen, len);
1261 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1267 case SO_LOCK_FILTER:
1268 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1271 case SO_BPF_EXTENSIONS:
1272 v.val = bpf_tell_extensions();
1275 case SO_SELECT_ERR_QUEUE:
1276 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1279 #ifdef CONFIG_NET_RX_BUSY_POLL
1281 v.val = sk->sk_ll_usec;
1285 case SO_MAX_PACING_RATE:
1286 v.val = sk->sk_max_pacing_rate;
1289 case SO_INCOMING_CPU:
1290 v.val = sk->sk_incoming_cpu;
1294 /* We implement the SO_SNDLOWAT etc to not be settable
1297 return -ENOPROTOOPT;
1302 if (copy_to_user(optval, &v, len))
1305 if (put_user(len, optlen))
1311 * Initialize an sk_lock.
1313 * (We also register the sk_lock with the lock validator.)
1315 static inline void sock_lock_init(struct sock *sk)
1317 sock_lock_init_class_and_name(sk,
1318 af_family_slock_key_strings[sk->sk_family],
1319 af_family_slock_keys + sk->sk_family,
1320 af_family_key_strings[sk->sk_family],
1321 af_family_keys + sk->sk_family);
1325 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1326 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1327 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1329 static void sock_copy(struct sock *nsk, const struct sock *osk)
1331 #ifdef CONFIG_SECURITY_NETWORK
1332 void *sptr = nsk->sk_security;
1334 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1336 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1337 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1339 #ifdef CONFIG_SECURITY_NETWORK
1340 nsk->sk_security = sptr;
1341 security_sk_clone(osk, nsk);
1345 void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1347 unsigned long nulls1, nulls2;
1349 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1350 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1351 if (nulls1 > nulls2)
1352 swap(nulls1, nulls2);
1355 memset((char *)sk, 0, nulls1);
1356 memset((char *)sk + nulls1 + sizeof(void *), 0,
1357 nulls2 - nulls1 - sizeof(void *));
1358 memset((char *)sk + nulls2 + sizeof(void *), 0,
1359 size - nulls2 - sizeof(void *));
1361 EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1363 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1367 struct kmem_cache *slab;
1371 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1374 if (priority & __GFP_ZERO) {
1376 prot->clear_sk(sk, prot->obj_size);
1378 sk_prot_clear_nulls(sk, prot->obj_size);
1381 sk = kmalloc(prot->obj_size, priority);
1384 kmemcheck_annotate_bitfield(sk, flags);
1386 if (security_sk_alloc(sk, family, priority))
1389 if (!try_module_get(prot->owner))
1391 sk_tx_queue_clear(sk);
1392 cgroup_sk_alloc(&sk->sk_cgrp_data);
1398 security_sk_free(sk);
1401 kmem_cache_free(slab, sk);
1407 static void sk_prot_free(struct proto *prot, struct sock *sk)
1409 struct kmem_cache *slab;
1410 struct module *owner;
1412 owner = prot->owner;
1415 cgroup_sk_free(&sk->sk_cgrp_data);
1416 security_sk_free(sk);
1418 kmem_cache_free(slab, sk);
1425 * sk_alloc - All socket objects are allocated here
1426 * @net: the applicable net namespace
1427 * @family: protocol family
1428 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1429 * @prot: struct proto associated with this new sock instance
1430 * @kern: is this to be a kernel socket?
1432 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1433 struct proto *prot, int kern)
1437 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1439 sk->sk_family = family;
1441 * See comment in struct sock definition to understand
1442 * why we need sk_prot_creator -acme
1444 sk->sk_prot = sk->sk_prot_creator = prot;
1446 sk->sk_net_refcnt = kern ? 0 : 1;
1447 if (likely(sk->sk_net_refcnt))
1449 sock_net_set(sk, net);
1450 atomic_set(&sk->sk_wmem_alloc, 1);
1452 sock_update_classid(&sk->sk_cgrp_data);
1453 sock_update_netprioidx(&sk->sk_cgrp_data);
1458 EXPORT_SYMBOL(sk_alloc);
1460 void sk_destruct(struct sock *sk)
1462 struct sk_filter *filter;
1464 if (sk->sk_destruct)
1465 sk->sk_destruct(sk);
1467 filter = rcu_dereference_check(sk->sk_filter,
1468 atomic_read(&sk->sk_wmem_alloc) == 0);
1470 sk_filter_uncharge(sk, filter);
1471 RCU_INIT_POINTER(sk->sk_filter, NULL);
1473 if (rcu_access_pointer(sk->sk_reuseport_cb))
1474 reuseport_detach_sock(sk);
1476 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1478 if (atomic_read(&sk->sk_omem_alloc))
1479 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1480 __func__, atomic_read(&sk->sk_omem_alloc));
1482 if (sk->sk_peer_cred)
1483 put_cred(sk->sk_peer_cred);
1484 put_pid(sk->sk_peer_pid);
1485 if (likely(sk->sk_net_refcnt))
1486 put_net(sock_net(sk));
1487 sk_prot_free(sk->sk_prot_creator, sk);
1490 static void __sk_free(struct sock *sk)
1492 if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt))
1493 sock_diag_broadcast_destroy(sk);
1498 void sk_free(struct sock *sk)
1501 * We subtract one from sk_wmem_alloc and can know if
1502 * some packets are still in some tx queue.
1503 * If not null, sock_wfree() will call __sk_free(sk) later
1505 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1508 EXPORT_SYMBOL(sk_free);
1510 static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1512 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1513 sock_update_memcg(newsk);
1517 * sk_clone_lock - clone a socket, and lock its clone
1518 * @sk: the socket to clone
1519 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1521 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1523 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1526 bool is_charged = true;
1528 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1529 if (newsk != NULL) {
1530 struct sk_filter *filter;
1532 sock_copy(newsk, sk);
1535 if (likely(newsk->sk_net_refcnt))
1536 get_net(sock_net(newsk));
1537 sk_node_init(&newsk->sk_node);
1538 sock_lock_init(newsk);
1539 bh_lock_sock(newsk);
1540 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1541 newsk->sk_backlog.len = 0;
1543 atomic_set(&newsk->sk_rmem_alloc, 0);
1545 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1547 atomic_set(&newsk->sk_wmem_alloc, 1);
1548 atomic_set(&newsk->sk_omem_alloc, 0);
1549 skb_queue_head_init(&newsk->sk_receive_queue);
1550 skb_queue_head_init(&newsk->sk_write_queue);
1552 rwlock_init(&newsk->sk_callback_lock);
1553 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1554 af_callback_keys + newsk->sk_family,
1555 af_family_clock_key_strings[newsk->sk_family]);
1557 newsk->sk_dst_cache = NULL;
1558 newsk->sk_wmem_queued = 0;
1559 newsk->sk_forward_alloc = 0;
1560 newsk->sk_send_head = NULL;
1561 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1563 sock_reset_flag(newsk, SOCK_DONE);
1564 skb_queue_head_init(&newsk->sk_error_queue);
1566 filter = rcu_dereference_protected(newsk->sk_filter, 1);
1568 /* though it's an empty new sock, the charging may fail
1569 * if sysctl_optmem_max was changed between creation of
1570 * original socket and cloning
1572 is_charged = sk_filter_charge(newsk, filter);
1574 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
1575 /* It is still raw copy of parent, so invalidate
1576 * destructor and make plain sk_free() */
1577 newsk->sk_destruct = NULL;
1578 bh_unlock_sock(newsk);
1585 newsk->sk_priority = 0;
1586 newsk->sk_incoming_cpu = raw_smp_processor_id();
1587 atomic64_set(&newsk->sk_cookie, 0);
1589 * Before updating sk_refcnt, we must commit prior changes to memory
1590 * (Documentation/RCU/rculist_nulls.txt for details)
1593 atomic_set(&newsk->sk_refcnt, 2);
1596 * Increment the counter in the same struct proto as the master
1597 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1598 * is the same as sk->sk_prot->socks, as this field was copied
1601 * This _changes_ the previous behaviour, where
1602 * tcp_create_openreq_child always was incrementing the
1603 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1604 * to be taken into account in all callers. -acme
1606 sk_refcnt_debug_inc(newsk);
1607 sk_set_socket(newsk, NULL);
1608 newsk->sk_wq = NULL;
1610 sk_update_clone(sk, newsk);
1612 if (newsk->sk_prot->sockets_allocated)
1613 sk_sockets_allocated_inc(newsk);
1615 if (sock_needs_netstamp(sk) &&
1616 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1617 net_enable_timestamp();
1622 EXPORT_SYMBOL_GPL(sk_clone_lock);
1624 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1628 sk_dst_set(sk, dst);
1629 sk->sk_route_caps = dst->dev->features;
1630 if (sk->sk_route_caps & NETIF_F_GSO)
1631 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1632 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1633 if (sk_can_gso(sk)) {
1634 if (dst->header_len) {
1635 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1637 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1638 sk->sk_gso_max_size = dst->dev->gso_max_size;
1639 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
1642 sk->sk_gso_max_segs = max_segs;
1644 EXPORT_SYMBOL_GPL(sk_setup_caps);
1647 * Simple resource managers for sockets.
1652 * Write buffer destructor automatically called from kfree_skb.
1654 void sock_wfree(struct sk_buff *skb)
1656 struct sock *sk = skb->sk;
1657 unsigned int len = skb->truesize;
1659 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1661 * Keep a reference on sk_wmem_alloc, this will be released
1662 * after sk_write_space() call
1664 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1665 sk->sk_write_space(sk);
1669 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1670 * could not do because of in-flight packets
1672 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
1675 EXPORT_SYMBOL(sock_wfree);
1677 void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1682 if (unlikely(!sk_fullsock(sk))) {
1683 skb->destructor = sock_edemux;
1688 skb->destructor = sock_wfree;
1689 skb_set_hash_from_sk(skb, sk);
1691 * We used to take a refcount on sk, but following operation
1692 * is enough to guarantee sk_free() wont free this sock until
1693 * all in-flight packets are completed
1695 atomic_add(skb->truesize, &sk->sk_wmem_alloc);
1697 EXPORT_SYMBOL(skb_set_owner_w);
1699 void skb_orphan_partial(struct sk_buff *skb)
1701 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1702 * so we do not completely orphan skb, but transfert all
1703 * accounted bytes but one, to avoid unexpected reorders.
1705 if (skb->destructor == sock_wfree
1707 || skb->destructor == tcp_wfree
1710 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1716 EXPORT_SYMBOL(skb_orphan_partial);
1719 * Read buffer destructor automatically called from kfree_skb.
1721 void sock_rfree(struct sk_buff *skb)
1723 struct sock *sk = skb->sk;
1724 unsigned int len = skb->truesize;
1726 atomic_sub(len, &sk->sk_rmem_alloc);
1727 sk_mem_uncharge(sk, len);
1729 EXPORT_SYMBOL(sock_rfree);
1732 * Buffer destructor for skbs that are not used directly in read or write
1733 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1735 void sock_efree(struct sk_buff *skb)
1739 EXPORT_SYMBOL(sock_efree);
1741 kuid_t sock_i_uid(struct sock *sk)
1745 read_lock_bh(&sk->sk_callback_lock);
1746 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
1747 read_unlock_bh(&sk->sk_callback_lock);
1750 EXPORT_SYMBOL(sock_i_uid);
1752 unsigned long sock_i_ino(struct sock *sk)
1756 read_lock_bh(&sk->sk_callback_lock);
1757 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1758 read_unlock_bh(&sk->sk_callback_lock);
1761 EXPORT_SYMBOL(sock_i_ino);
1764 * Allocate a skb from the socket's send buffer.
1766 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1769 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1770 struct sk_buff *skb = alloc_skb(size, priority);
1772 skb_set_owner_w(skb, sk);
1778 EXPORT_SYMBOL(sock_wmalloc);
1781 * Allocate a memory block from the socket's option memory buffer.
1783 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1785 if ((unsigned int)size <= sysctl_optmem_max &&
1786 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1788 /* First do the add, to avoid the race if kmalloc
1791 atomic_add(size, &sk->sk_omem_alloc);
1792 mem = kmalloc(size, priority);
1795 atomic_sub(size, &sk->sk_omem_alloc);
1799 EXPORT_SYMBOL(sock_kmalloc);
1801 /* Free an option memory block. Note, we actually want the inline
1802 * here as this allows gcc to detect the nullify and fold away the
1803 * condition entirely.
1805 static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1808 if (WARN_ON_ONCE(!mem))
1814 atomic_sub(size, &sk->sk_omem_alloc);
1817 void sock_kfree_s(struct sock *sk, void *mem, int size)
1819 __sock_kfree_s(sk, mem, size, false);
1821 EXPORT_SYMBOL(sock_kfree_s);
1823 void sock_kzfree_s(struct sock *sk, void *mem, int size)
1825 __sock_kfree_s(sk, mem, size, true);
1827 EXPORT_SYMBOL(sock_kzfree_s);
1829 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1830 I think, these locks should be removed for datagram sockets.
1832 static long sock_wait_for_wmem(struct sock *sk, long timeo)
1836 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1840 if (signal_pending(current))
1842 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1843 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1844 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1846 if (sk->sk_shutdown & SEND_SHUTDOWN)
1850 timeo = schedule_timeout(timeo);
1852 finish_wait(sk_sleep(sk), &wait);
1858 * Generic send/receive buffer handlers
1861 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1862 unsigned long data_len, int noblock,
1863 int *errcode, int max_page_order)
1865 struct sk_buff *skb;
1869 timeo = sock_sndtimeo(sk, noblock);
1871 err = sock_error(sk);
1876 if (sk->sk_shutdown & SEND_SHUTDOWN)
1879 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
1882 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1883 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1887 if (signal_pending(current))
1889 timeo = sock_wait_for_wmem(sk, timeo);
1891 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
1892 errcode, sk->sk_allocation);
1894 skb_set_owner_w(skb, sk);
1898 err = sock_intr_errno(timeo);
1903 EXPORT_SYMBOL(sock_alloc_send_pskb);
1905 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1906 int noblock, int *errcode)
1908 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1910 EXPORT_SYMBOL(sock_alloc_send_skb);
1912 int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
1913 struct sockcm_cookie *sockc)
1915 struct cmsghdr *cmsg;
1917 for_each_cmsghdr(cmsg, msg) {
1918 if (!CMSG_OK(msg, cmsg))
1920 if (cmsg->cmsg_level != SOL_SOCKET)
1922 switch (cmsg->cmsg_type) {
1924 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1926 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
1928 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
1936 EXPORT_SYMBOL(sock_cmsg_send);
1938 /* On 32bit arches, an skb frag is limited to 2^15 */
1939 #define SKB_FRAG_PAGE_ORDER get_order(32768)
1942 * skb_page_frag_refill - check that a page_frag contains enough room
1943 * @sz: minimum size of the fragment we want to get
1944 * @pfrag: pointer to page_frag
1945 * @gfp: priority for memory allocation
1947 * Note: While this allocator tries to use high order pages, there is
1948 * no guarantee that allocations succeed. Therefore, @sz MUST be
1949 * less or equal than PAGE_SIZE.
1951 bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
1954 if (atomic_read(&pfrag->page->_count) == 1) {
1958 if (pfrag->offset + sz <= pfrag->size)
1960 put_page(pfrag->page);
1964 if (SKB_FRAG_PAGE_ORDER) {
1965 /* Avoid direct reclaim but allow kswapd to wake */
1966 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
1967 __GFP_COMP | __GFP_NOWARN |
1969 SKB_FRAG_PAGE_ORDER);
1970 if (likely(pfrag->page)) {
1971 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
1975 pfrag->page = alloc_page(gfp);
1976 if (likely(pfrag->page)) {
1977 pfrag->size = PAGE_SIZE;
1982 EXPORT_SYMBOL(skb_page_frag_refill);
1984 bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1986 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1989 sk_enter_memory_pressure(sk);
1990 sk_stream_moderate_sndbuf(sk);
1993 EXPORT_SYMBOL(sk_page_frag_refill);
1995 static void __lock_sock(struct sock *sk)
1996 __releases(&sk->sk_lock.slock)
1997 __acquires(&sk->sk_lock.slock)
2002 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2003 TASK_UNINTERRUPTIBLE);
2004 spin_unlock_bh(&sk->sk_lock.slock);
2006 spin_lock_bh(&sk->sk_lock.slock);
2007 if (!sock_owned_by_user(sk))
2010 finish_wait(&sk->sk_lock.wq, &wait);
2013 static void __release_sock(struct sock *sk)
2014 __releases(&sk->sk_lock.slock)
2015 __acquires(&sk->sk_lock.slock)
2017 struct sk_buff *skb = sk->sk_backlog.head;
2020 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
2024 struct sk_buff *next = skb->next;
2027 WARN_ON_ONCE(skb_dst_is_noref(skb));
2029 sk_backlog_rcv(sk, skb);
2032 * We are in process context here with softirqs
2033 * disabled, use cond_resched_softirq() to preempt.
2034 * This is safe to do because we've taken the backlog
2037 cond_resched_softirq();
2040 } while (skb != NULL);
2043 } while ((skb = sk->sk_backlog.head) != NULL);
2046 * Doing the zeroing here guarantee we can not loop forever
2047 * while a wild producer attempts to flood us.
2049 sk->sk_backlog.len = 0;
2053 * sk_wait_data - wait for data to arrive at sk_receive_queue
2054 * @sk: sock to wait on
2055 * @timeo: for how long
2056 * @skb: last skb seen on sk_receive_queue
2058 * Now socket state including sk->sk_err is changed only under lock,
2059 * hence we may omit checks after joining wait queue.
2060 * We check receive queue before schedule() only as optimization;
2061 * it is very likely that release_sock() added new data.
2063 int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
2068 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2069 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2070 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb);
2071 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2072 finish_wait(sk_sleep(sk), &wait);
2075 EXPORT_SYMBOL(sk_wait_data);
2078 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2080 * @size: memory size to allocate
2081 * @kind: allocation type
2083 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2084 * rmem allocation. This function assumes that protocols which have
2085 * memory_pressure use sk_wmem_queued as write buffer accounting.
2087 int __sk_mem_schedule(struct sock *sk, int size, int kind)
2089 struct proto *prot = sk->sk_prot;
2090 int amt = sk_mem_pages(size);
2092 int parent_status = UNDER_LIMIT;
2094 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
2096 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
2099 if (parent_status == UNDER_LIMIT &&
2100 allocated <= sk_prot_mem_limits(sk, 0)) {
2101 sk_leave_memory_pressure(sk);
2105 /* Under pressure. (we or our parents) */
2106 if ((parent_status > SOFT_LIMIT) ||
2107 allocated > sk_prot_mem_limits(sk, 1))
2108 sk_enter_memory_pressure(sk);
2110 /* Over hard limit (we or our parents) */
2111 if ((parent_status == OVER_LIMIT) ||
2112 (allocated > sk_prot_mem_limits(sk, 2)))
2113 goto suppress_allocation;
2115 /* guarantee minimum buffer size under pressure */
2116 if (kind == SK_MEM_RECV) {
2117 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2120 } else { /* SK_MEM_SEND */
2121 if (sk->sk_type == SOCK_STREAM) {
2122 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2124 } else if (atomic_read(&sk->sk_wmem_alloc) <
2125 prot->sysctl_wmem[0])
2129 if (sk_has_memory_pressure(sk)) {
2132 if (!sk_under_memory_pressure(sk))
2134 alloc = sk_sockets_allocated_read_positive(sk);
2135 if (sk_prot_mem_limits(sk, 2) > alloc *
2136 sk_mem_pages(sk->sk_wmem_queued +
2137 atomic_read(&sk->sk_rmem_alloc) +
2138 sk->sk_forward_alloc))
2142 suppress_allocation:
2144 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2145 sk_stream_moderate_sndbuf(sk);
2147 /* Fail only if socket is _under_ its sndbuf.
2148 * In this case we cannot block, so that we have to fail.
2150 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2154 trace_sock_exceed_buf_limit(sk, prot, allocated);
2156 /* Alas. Undo changes. */
2157 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
2159 sk_memory_allocated_sub(sk, amt);
2163 EXPORT_SYMBOL(__sk_mem_schedule);
2166 * __sk_mem_reclaim - reclaim memory_allocated
2168 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
2170 void __sk_mem_reclaim(struct sock *sk, int amount)
2172 amount >>= SK_MEM_QUANTUM_SHIFT;
2173 sk_memory_allocated_sub(sk, amount);
2174 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
2176 if (sk_under_memory_pressure(sk) &&
2177 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2178 sk_leave_memory_pressure(sk);
2180 EXPORT_SYMBOL(__sk_mem_reclaim);
2184 * Set of default routines for initialising struct proto_ops when
2185 * the protocol does not support a particular function. In certain
2186 * cases where it makes no sense for a protocol to have a "do nothing"
2187 * function, some default processing is provided.
2190 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2194 EXPORT_SYMBOL(sock_no_bind);
2196 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
2201 EXPORT_SYMBOL(sock_no_connect);
2203 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2207 EXPORT_SYMBOL(sock_no_socketpair);
2209 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2213 EXPORT_SYMBOL(sock_no_accept);
2215 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
2220 EXPORT_SYMBOL(sock_no_getname);
2222 unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
2226 EXPORT_SYMBOL(sock_no_poll);
2228 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2232 EXPORT_SYMBOL(sock_no_ioctl);
2234 int sock_no_listen(struct socket *sock, int backlog)
2238 EXPORT_SYMBOL(sock_no_listen);
2240 int sock_no_shutdown(struct socket *sock, int how)
2244 EXPORT_SYMBOL(sock_no_shutdown);
2246 int sock_no_setsockopt(struct socket *sock, int level, int optname,
2247 char __user *optval, unsigned int optlen)
2251 EXPORT_SYMBOL(sock_no_setsockopt);
2253 int sock_no_getsockopt(struct socket *sock, int level, int optname,
2254 char __user *optval, int __user *optlen)
2258 EXPORT_SYMBOL(sock_no_getsockopt);
2260 int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
2264 EXPORT_SYMBOL(sock_no_sendmsg);
2266 int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2271 EXPORT_SYMBOL(sock_no_recvmsg);
2273 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2275 /* Mirror missing mmap method error code */
2278 EXPORT_SYMBOL(sock_no_mmap);
2280 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2283 struct msghdr msg = {.msg_flags = flags};
2285 char *kaddr = kmap(page);
2286 iov.iov_base = kaddr + offset;
2288 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2292 EXPORT_SYMBOL(sock_no_sendpage);
2295 * Default Socket Callbacks
2298 static void sock_def_wakeup(struct sock *sk)
2300 struct socket_wq *wq;
2303 wq = rcu_dereference(sk->sk_wq);
2304 if (skwq_has_sleeper(wq))
2305 wake_up_interruptible_all(&wq->wait);
2309 static void sock_def_error_report(struct sock *sk)
2311 struct socket_wq *wq;
2314 wq = rcu_dereference(sk->sk_wq);
2315 if (skwq_has_sleeper(wq))
2316 wake_up_interruptible_poll(&wq->wait, POLLERR);
2317 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2321 static void sock_def_readable(struct sock *sk)
2323 struct socket_wq *wq;
2326 wq = rcu_dereference(sk->sk_wq);
2327 if (skwq_has_sleeper(wq))
2328 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
2329 POLLRDNORM | POLLRDBAND);
2330 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2334 static void sock_def_write_space(struct sock *sk)
2336 struct socket_wq *wq;
2340 /* Do not wake up a writer until he can make "significant"
2343 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
2344 wq = rcu_dereference(sk->sk_wq);
2345 if (skwq_has_sleeper(wq))
2346 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
2347 POLLWRNORM | POLLWRBAND);
2349 /* Should agree with poll, otherwise some programs break */
2350 if (sock_writeable(sk))
2351 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2357 static void sock_def_destruct(struct sock *sk)
2361 void sk_send_sigurg(struct sock *sk)
2363 if (sk->sk_socket && sk->sk_socket->file)
2364 if (send_sigurg(&sk->sk_socket->file->f_owner))
2365 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2367 EXPORT_SYMBOL(sk_send_sigurg);
2369 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2370 unsigned long expires)
2372 if (!mod_timer(timer, expires))
2375 EXPORT_SYMBOL(sk_reset_timer);
2377 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2379 if (del_timer(timer))
2382 EXPORT_SYMBOL(sk_stop_timer);
2384 void sock_init_data(struct socket *sock, struct sock *sk)
2386 skb_queue_head_init(&sk->sk_receive_queue);
2387 skb_queue_head_init(&sk->sk_write_queue);
2388 skb_queue_head_init(&sk->sk_error_queue);
2390 sk->sk_send_head = NULL;
2392 init_timer(&sk->sk_timer);
2394 sk->sk_allocation = GFP_KERNEL;
2395 sk->sk_rcvbuf = sysctl_rmem_default;
2396 sk->sk_sndbuf = sysctl_wmem_default;
2397 sk->sk_state = TCP_CLOSE;
2398 sk_set_socket(sk, sock);
2400 sock_set_flag(sk, SOCK_ZAPPED);
2403 sk->sk_type = sock->type;
2404 sk->sk_wq = sock->wq;
2409 rwlock_init(&sk->sk_callback_lock);
2410 lockdep_set_class_and_name(&sk->sk_callback_lock,
2411 af_callback_keys + sk->sk_family,
2412 af_family_clock_key_strings[sk->sk_family]);
2414 sk->sk_state_change = sock_def_wakeup;
2415 sk->sk_data_ready = sock_def_readable;
2416 sk->sk_write_space = sock_def_write_space;
2417 sk->sk_error_report = sock_def_error_report;
2418 sk->sk_destruct = sock_def_destruct;
2420 sk->sk_frag.page = NULL;
2421 sk->sk_frag.offset = 0;
2422 sk->sk_peek_off = -1;
2424 sk->sk_peer_pid = NULL;
2425 sk->sk_peer_cred = NULL;
2426 sk->sk_write_pending = 0;
2427 sk->sk_rcvlowat = 1;
2428 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2429 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2431 sk->sk_stamp = ktime_set(-1L, 0);
2433 #ifdef CONFIG_NET_RX_BUSY_POLL
2435 sk->sk_ll_usec = sysctl_net_busy_read;
2438 sk->sk_max_pacing_rate = ~0U;
2439 sk->sk_pacing_rate = ~0U;
2440 sk->sk_incoming_cpu = -1;
2442 * Before updating sk_refcnt, we must commit prior changes to memory
2443 * (Documentation/RCU/rculist_nulls.txt for details)
2446 atomic_set(&sk->sk_refcnt, 1);
2447 atomic_set(&sk->sk_drops, 0);
2449 EXPORT_SYMBOL(sock_init_data);
2451 void lock_sock_nested(struct sock *sk, int subclass)
2454 spin_lock_bh(&sk->sk_lock.slock);
2455 if (sk->sk_lock.owned)
2457 sk->sk_lock.owned = 1;
2458 spin_unlock(&sk->sk_lock.slock);
2460 * The sk_lock has mutex_lock() semantics here:
2462 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2465 EXPORT_SYMBOL(lock_sock_nested);
2467 void release_sock(struct sock *sk)
2470 * The sk_lock has mutex_unlock() semantics:
2472 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2474 spin_lock_bh(&sk->sk_lock.slock);
2475 if (sk->sk_backlog.tail)
2478 /* Warning : release_cb() might need to release sk ownership,
2479 * ie call sock_release_ownership(sk) before us.
2481 if (sk->sk_prot->release_cb)
2482 sk->sk_prot->release_cb(sk);
2484 sock_release_ownership(sk);
2485 if (waitqueue_active(&sk->sk_lock.wq))
2486 wake_up(&sk->sk_lock.wq);
2487 spin_unlock_bh(&sk->sk_lock.slock);
2489 EXPORT_SYMBOL(release_sock);
2492 * lock_sock_fast - fast version of lock_sock
2495 * This version should be used for very small section, where process wont block
2496 * return false if fast path is taken
2497 * sk_lock.slock locked, owned = 0, BH disabled
2498 * return true if slow path is taken
2499 * sk_lock.slock unlocked, owned = 1, BH enabled
2501 bool lock_sock_fast(struct sock *sk)
2504 spin_lock_bh(&sk->sk_lock.slock);
2506 if (!sk->sk_lock.owned)
2508 * Note : We must disable BH
2513 sk->sk_lock.owned = 1;
2514 spin_unlock(&sk->sk_lock.slock);
2516 * The sk_lock has mutex_lock() semantics here:
2518 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2522 EXPORT_SYMBOL(lock_sock_fast);
2524 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2527 if (!sock_flag(sk, SOCK_TIMESTAMP))
2528 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2529 tv = ktime_to_timeval(sk->sk_stamp);
2530 if (tv.tv_sec == -1)
2532 if (tv.tv_sec == 0) {
2533 sk->sk_stamp = ktime_get_real();
2534 tv = ktime_to_timeval(sk->sk_stamp);
2536 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
2538 EXPORT_SYMBOL(sock_get_timestamp);
2540 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2543 if (!sock_flag(sk, SOCK_TIMESTAMP))
2544 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2545 ts = ktime_to_timespec(sk->sk_stamp);
2546 if (ts.tv_sec == -1)
2548 if (ts.tv_sec == 0) {
2549 sk->sk_stamp = ktime_get_real();
2550 ts = ktime_to_timespec(sk->sk_stamp);
2552 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2554 EXPORT_SYMBOL(sock_get_timestampns);
2556 void sock_enable_timestamp(struct sock *sk, int flag)
2558 if (!sock_flag(sk, flag)) {
2559 unsigned long previous_flags = sk->sk_flags;
2561 sock_set_flag(sk, flag);
2563 * we just set one of the two flags which require net
2564 * time stamping, but time stamping might have been on
2565 * already because of the other one
2567 if (sock_needs_netstamp(sk) &&
2568 !(previous_flags & SK_FLAGS_TIMESTAMP))
2569 net_enable_timestamp();
2573 int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2574 int level, int type)
2576 struct sock_exterr_skb *serr;
2577 struct sk_buff *skb;
2581 skb = sock_dequeue_err_skb(sk);
2587 msg->msg_flags |= MSG_TRUNC;
2590 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2594 sock_recv_timestamp(msg, sk, skb);
2596 serr = SKB_EXT_ERR(skb);
2597 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2599 msg->msg_flags |= MSG_ERRQUEUE;
2607 EXPORT_SYMBOL(sock_recv_errqueue);
2610 * Get a socket option on an socket.
2612 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2613 * asynchronous errors should be reported by getsockopt. We assume
2614 * this means if you specify SO_ERROR (otherwise whats the point of it).
2616 int sock_common_getsockopt(struct socket *sock, int level, int optname,
2617 char __user *optval, int __user *optlen)
2619 struct sock *sk = sock->sk;
2621 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2623 EXPORT_SYMBOL(sock_common_getsockopt);
2625 #ifdef CONFIG_COMPAT
2626 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2627 char __user *optval, int __user *optlen)
2629 struct sock *sk = sock->sk;
2631 if (sk->sk_prot->compat_getsockopt != NULL)
2632 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2634 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2636 EXPORT_SYMBOL(compat_sock_common_getsockopt);
2639 int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2642 struct sock *sk = sock->sk;
2646 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
2647 flags & ~MSG_DONTWAIT, &addr_len);
2649 msg->msg_namelen = addr_len;
2652 EXPORT_SYMBOL(sock_common_recvmsg);
2655 * Set socket options on an inet socket.
2657 int sock_common_setsockopt(struct socket *sock, int level, int optname,
2658 char __user *optval, unsigned int optlen)
2660 struct sock *sk = sock->sk;
2662 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2664 EXPORT_SYMBOL(sock_common_setsockopt);
2666 #ifdef CONFIG_COMPAT
2667 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2668 char __user *optval, unsigned int optlen)
2670 struct sock *sk = sock->sk;
2672 if (sk->sk_prot->compat_setsockopt != NULL)
2673 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2675 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2677 EXPORT_SYMBOL(compat_sock_common_setsockopt);
2680 void sk_common_release(struct sock *sk)
2682 if (sk->sk_prot->destroy)
2683 sk->sk_prot->destroy(sk);
2686 * Observation: when sock_common_release is called, processes have
2687 * no access to socket. But net still has.
2688 * Step one, detach it from networking:
2690 * A. Remove from hash tables.
2693 sk->sk_prot->unhash(sk);
2696 * In this point socket cannot receive new packets, but it is possible
2697 * that some packets are in flight because some CPU runs receiver and
2698 * did hash table lookup before we unhashed socket. They will achieve
2699 * receive queue and will be purged by socket destructor.
2701 * Also we still have packets pending on receive queue and probably,
2702 * our own packets waiting in device queues. sock_destroy will drain
2703 * receive queue, but transmitted packets will delay socket destruction
2704 * until the last reference will be released.
2709 xfrm_sk_free_policy(sk);
2711 sk_refcnt_debug_release(sk);
2713 if (sk->sk_frag.page) {
2714 put_page(sk->sk_frag.page);
2715 sk->sk_frag.page = NULL;
2720 EXPORT_SYMBOL(sk_common_release);
2722 #ifdef CONFIG_PROC_FS
2723 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
2725 int val[PROTO_INUSE_NR];
2728 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2730 #ifdef CONFIG_NET_NS
2731 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2733 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
2735 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2737 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2739 int cpu, idx = prot->inuse_idx;
2742 for_each_possible_cpu(cpu)
2743 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2745 return res >= 0 ? res : 0;
2747 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2749 static int __net_init sock_inuse_init_net(struct net *net)
2751 net->core.inuse = alloc_percpu(struct prot_inuse);
2752 return net->core.inuse ? 0 : -ENOMEM;
2755 static void __net_exit sock_inuse_exit_net(struct net *net)
2757 free_percpu(net->core.inuse);
2760 static struct pernet_operations net_inuse_ops = {
2761 .init = sock_inuse_init_net,
2762 .exit = sock_inuse_exit_net,
2765 static __init int net_inuse_init(void)
2767 if (register_pernet_subsys(&net_inuse_ops))
2768 panic("Cannot initialize net inuse counters");
2773 core_initcall(net_inuse_init);
2775 static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2777 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2779 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
2781 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2783 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2785 int cpu, idx = prot->inuse_idx;
2788 for_each_possible_cpu(cpu)
2789 res += per_cpu(prot_inuse, cpu).val[idx];
2791 return res >= 0 ? res : 0;
2793 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2796 static void assign_proto_idx(struct proto *prot)
2798 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2800 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2801 pr_err("PROTO_INUSE_NR exhausted\n");
2805 set_bit(prot->inuse_idx, proto_inuse_idx);
2808 static void release_proto_idx(struct proto *prot)
2810 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2811 clear_bit(prot->inuse_idx, proto_inuse_idx);
2814 static inline void assign_proto_idx(struct proto *prot)
2818 static inline void release_proto_idx(struct proto *prot)
2823 static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
2827 kfree(rsk_prot->slab_name);
2828 rsk_prot->slab_name = NULL;
2829 kmem_cache_destroy(rsk_prot->slab);
2830 rsk_prot->slab = NULL;
2833 static int req_prot_init(const struct proto *prot)
2835 struct request_sock_ops *rsk_prot = prot->rsk_prot;
2840 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
2842 if (!rsk_prot->slab_name)
2845 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
2846 rsk_prot->obj_size, 0,
2847 prot->slab_flags, NULL);
2849 if (!rsk_prot->slab) {
2850 pr_crit("%s: Can't create request sock SLAB cache!\n",
2857 int proto_register(struct proto *prot, int alloc_slab)
2860 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2861 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2864 if (prot->slab == NULL) {
2865 pr_crit("%s: Can't create sock SLAB cache!\n",
2870 if (req_prot_init(prot))
2871 goto out_free_request_sock_slab;
2873 if (prot->twsk_prot != NULL) {
2874 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
2876 if (prot->twsk_prot->twsk_slab_name == NULL)
2877 goto out_free_request_sock_slab;
2879 prot->twsk_prot->twsk_slab =
2880 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2881 prot->twsk_prot->twsk_obj_size,
2885 if (prot->twsk_prot->twsk_slab == NULL)
2886 goto out_free_timewait_sock_slab_name;
2890 mutex_lock(&proto_list_mutex);
2891 list_add(&prot->node, &proto_list);
2892 assign_proto_idx(prot);
2893 mutex_unlock(&proto_list_mutex);
2896 out_free_timewait_sock_slab_name:
2897 kfree(prot->twsk_prot->twsk_slab_name);
2898 out_free_request_sock_slab:
2899 req_prot_cleanup(prot->rsk_prot);
2901 kmem_cache_destroy(prot->slab);
2906 EXPORT_SYMBOL(proto_register);
2908 void proto_unregister(struct proto *prot)
2910 mutex_lock(&proto_list_mutex);
2911 release_proto_idx(prot);
2912 list_del(&prot->node);
2913 mutex_unlock(&proto_list_mutex);
2915 kmem_cache_destroy(prot->slab);
2918 req_prot_cleanup(prot->rsk_prot);
2920 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2921 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2922 kfree(prot->twsk_prot->twsk_slab_name);
2923 prot->twsk_prot->twsk_slab = NULL;
2926 EXPORT_SYMBOL(proto_unregister);
2928 #ifdef CONFIG_PROC_FS
2929 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2930 __acquires(proto_list_mutex)
2932 mutex_lock(&proto_list_mutex);
2933 return seq_list_start_head(&proto_list, *pos);
2936 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2938 return seq_list_next(v, &proto_list, pos);
2941 static void proto_seq_stop(struct seq_file *seq, void *v)
2942 __releases(proto_list_mutex)
2944 mutex_unlock(&proto_list_mutex);
2947 static char proto_method_implemented(const void *method)
2949 return method == NULL ? 'n' : 'y';
2951 static long sock_prot_memory_allocated(struct proto *proto)
2953 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
2956 static char *sock_prot_memory_pressure(struct proto *proto)
2958 return proto->memory_pressure != NULL ?
2959 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2962 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2965 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
2966 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2969 sock_prot_inuse_get(seq_file_net(seq), proto),
2970 sock_prot_memory_allocated(proto),
2971 sock_prot_memory_pressure(proto),
2973 proto->slab == NULL ? "no" : "yes",
2974 module_name(proto->owner),
2975 proto_method_implemented(proto->close),
2976 proto_method_implemented(proto->connect),
2977 proto_method_implemented(proto->disconnect),
2978 proto_method_implemented(proto->accept),
2979 proto_method_implemented(proto->ioctl),
2980 proto_method_implemented(proto->init),
2981 proto_method_implemented(proto->destroy),
2982 proto_method_implemented(proto->shutdown),
2983 proto_method_implemented(proto->setsockopt),
2984 proto_method_implemented(proto->getsockopt),
2985 proto_method_implemented(proto->sendmsg),
2986 proto_method_implemented(proto->recvmsg),
2987 proto_method_implemented(proto->sendpage),
2988 proto_method_implemented(proto->bind),
2989 proto_method_implemented(proto->backlog_rcv),
2990 proto_method_implemented(proto->hash),
2991 proto_method_implemented(proto->unhash),
2992 proto_method_implemented(proto->get_port),
2993 proto_method_implemented(proto->enter_memory_pressure));
2996 static int proto_seq_show(struct seq_file *seq, void *v)
2998 if (v == &proto_list)
2999 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3008 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3010 proto_seq_printf(seq, list_entry(v, struct proto, node));
3014 static const struct seq_operations proto_seq_ops = {
3015 .start = proto_seq_start,
3016 .next = proto_seq_next,
3017 .stop = proto_seq_stop,
3018 .show = proto_seq_show,
3021 static int proto_seq_open(struct inode *inode, struct file *file)
3023 return seq_open_net(inode, file, &proto_seq_ops,
3024 sizeof(struct seq_net_private));
3027 static const struct file_operations proto_seq_fops = {
3028 .owner = THIS_MODULE,
3029 .open = proto_seq_open,
3031 .llseek = seq_lseek,
3032 .release = seq_release_net,
3035 static __net_init int proto_init_net(struct net *net)
3037 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
3043 static __net_exit void proto_exit_net(struct net *net)
3045 remove_proc_entry("protocols", net->proc_net);
3049 static __net_initdata struct pernet_operations proto_net_ops = {
3050 .init = proto_init_net,
3051 .exit = proto_exit_net,
3054 static int __init proto_init(void)
3056 return register_pernet_subsys(&proto_net_ops);
3059 subsys_initcall(proto_init);
3061 #endif /* PROC_FS */