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);
1511 * sk_clone_lock - clone a socket, and lock its clone
1512 * @sk: the socket to clone
1513 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1515 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1517 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1520 bool is_charged = true;
1522 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1523 if (newsk != NULL) {
1524 struct sk_filter *filter;
1526 sock_copy(newsk, sk);
1529 if (likely(newsk->sk_net_refcnt))
1530 get_net(sock_net(newsk));
1531 sk_node_init(&newsk->sk_node);
1532 sock_lock_init(newsk);
1533 bh_lock_sock(newsk);
1534 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1535 newsk->sk_backlog.len = 0;
1537 atomic_set(&newsk->sk_rmem_alloc, 0);
1539 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1541 atomic_set(&newsk->sk_wmem_alloc, 1);
1542 atomic_set(&newsk->sk_omem_alloc, 0);
1543 skb_queue_head_init(&newsk->sk_receive_queue);
1544 skb_queue_head_init(&newsk->sk_write_queue);
1546 rwlock_init(&newsk->sk_callback_lock);
1547 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1548 af_callback_keys + newsk->sk_family,
1549 af_family_clock_key_strings[newsk->sk_family]);
1551 newsk->sk_dst_cache = NULL;
1552 newsk->sk_wmem_queued = 0;
1553 newsk->sk_forward_alloc = 0;
1554 newsk->sk_send_head = NULL;
1555 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1557 sock_reset_flag(newsk, SOCK_DONE);
1558 skb_queue_head_init(&newsk->sk_error_queue);
1560 filter = rcu_dereference_protected(newsk->sk_filter, 1);
1562 /* though it's an empty new sock, the charging may fail
1563 * if sysctl_optmem_max was changed between creation of
1564 * original socket and cloning
1566 is_charged = sk_filter_charge(newsk, filter);
1568 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
1569 /* It is still raw copy of parent, so invalidate
1570 * destructor and make plain sk_free() */
1571 newsk->sk_destruct = NULL;
1572 bh_unlock_sock(newsk);
1579 newsk->sk_priority = 0;
1580 newsk->sk_incoming_cpu = raw_smp_processor_id();
1581 atomic64_set(&newsk->sk_cookie, 0);
1583 * Before updating sk_refcnt, we must commit prior changes to memory
1584 * (Documentation/RCU/rculist_nulls.txt for details)
1587 atomic_set(&newsk->sk_refcnt, 2);
1590 * Increment the counter in the same struct proto as the master
1591 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1592 * is the same as sk->sk_prot->socks, as this field was copied
1595 * This _changes_ the previous behaviour, where
1596 * tcp_create_openreq_child always was incrementing the
1597 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1598 * to be taken into account in all callers. -acme
1600 sk_refcnt_debug_inc(newsk);
1601 sk_set_socket(newsk, NULL);
1602 newsk->sk_wq = NULL;
1604 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1605 sock_update_memcg(newsk);
1607 if (newsk->sk_prot->sockets_allocated)
1608 sk_sockets_allocated_inc(newsk);
1610 if (sock_needs_netstamp(sk) &&
1611 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1612 net_enable_timestamp();
1617 EXPORT_SYMBOL_GPL(sk_clone_lock);
1619 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1623 sk_dst_set(sk, dst);
1624 sk->sk_route_caps = dst->dev->features;
1625 if (sk->sk_route_caps & NETIF_F_GSO)
1626 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1627 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1628 if (sk_can_gso(sk)) {
1629 if (dst->header_len) {
1630 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1632 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1633 sk->sk_gso_max_size = dst->dev->gso_max_size;
1634 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
1637 sk->sk_gso_max_segs = max_segs;
1639 EXPORT_SYMBOL_GPL(sk_setup_caps);
1642 * Simple resource managers for sockets.
1647 * Write buffer destructor automatically called from kfree_skb.
1649 void sock_wfree(struct sk_buff *skb)
1651 struct sock *sk = skb->sk;
1652 unsigned int len = skb->truesize;
1654 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1656 * Keep a reference on sk_wmem_alloc, this will be released
1657 * after sk_write_space() call
1659 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1660 sk->sk_write_space(sk);
1664 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1665 * could not do because of in-flight packets
1667 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
1670 EXPORT_SYMBOL(sock_wfree);
1672 void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1677 if (unlikely(!sk_fullsock(sk))) {
1678 skb->destructor = sock_edemux;
1683 skb->destructor = sock_wfree;
1684 skb_set_hash_from_sk(skb, sk);
1686 * We used to take a refcount on sk, but following operation
1687 * is enough to guarantee sk_free() wont free this sock until
1688 * all in-flight packets are completed
1690 atomic_add(skb->truesize, &sk->sk_wmem_alloc);
1692 EXPORT_SYMBOL(skb_set_owner_w);
1694 void skb_orphan_partial(struct sk_buff *skb)
1696 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1697 * so we do not completely orphan skb, but transfert all
1698 * accounted bytes but one, to avoid unexpected reorders.
1700 if (skb->destructor == sock_wfree
1702 || skb->destructor == tcp_wfree
1705 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1711 EXPORT_SYMBOL(skb_orphan_partial);
1714 * Read buffer destructor automatically called from kfree_skb.
1716 void sock_rfree(struct sk_buff *skb)
1718 struct sock *sk = skb->sk;
1719 unsigned int len = skb->truesize;
1721 atomic_sub(len, &sk->sk_rmem_alloc);
1722 sk_mem_uncharge(sk, len);
1724 EXPORT_SYMBOL(sock_rfree);
1727 * Buffer destructor for skbs that are not used directly in read or write
1728 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1730 void sock_efree(struct sk_buff *skb)
1734 EXPORT_SYMBOL(sock_efree);
1736 kuid_t sock_i_uid(struct sock *sk)
1740 read_lock_bh(&sk->sk_callback_lock);
1741 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
1742 read_unlock_bh(&sk->sk_callback_lock);
1745 EXPORT_SYMBOL(sock_i_uid);
1747 unsigned long sock_i_ino(struct sock *sk)
1751 read_lock_bh(&sk->sk_callback_lock);
1752 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1753 read_unlock_bh(&sk->sk_callback_lock);
1756 EXPORT_SYMBOL(sock_i_ino);
1759 * Allocate a skb from the socket's send buffer.
1761 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1764 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1765 struct sk_buff *skb = alloc_skb(size, priority);
1767 skb_set_owner_w(skb, sk);
1773 EXPORT_SYMBOL(sock_wmalloc);
1776 * Allocate a memory block from the socket's option memory buffer.
1778 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1780 if ((unsigned int)size <= sysctl_optmem_max &&
1781 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1783 /* First do the add, to avoid the race if kmalloc
1786 atomic_add(size, &sk->sk_omem_alloc);
1787 mem = kmalloc(size, priority);
1790 atomic_sub(size, &sk->sk_omem_alloc);
1794 EXPORT_SYMBOL(sock_kmalloc);
1796 /* Free an option memory block. Note, we actually want the inline
1797 * here as this allows gcc to detect the nullify and fold away the
1798 * condition entirely.
1800 static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1803 if (WARN_ON_ONCE(!mem))
1809 atomic_sub(size, &sk->sk_omem_alloc);
1812 void sock_kfree_s(struct sock *sk, void *mem, int size)
1814 __sock_kfree_s(sk, mem, size, false);
1816 EXPORT_SYMBOL(sock_kfree_s);
1818 void sock_kzfree_s(struct sock *sk, void *mem, int size)
1820 __sock_kfree_s(sk, mem, size, true);
1822 EXPORT_SYMBOL(sock_kzfree_s);
1824 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1825 I think, these locks should be removed for datagram sockets.
1827 static long sock_wait_for_wmem(struct sock *sk, long timeo)
1831 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1835 if (signal_pending(current))
1837 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1838 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1839 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1841 if (sk->sk_shutdown & SEND_SHUTDOWN)
1845 timeo = schedule_timeout(timeo);
1847 finish_wait(sk_sleep(sk), &wait);
1853 * Generic send/receive buffer handlers
1856 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1857 unsigned long data_len, int noblock,
1858 int *errcode, int max_page_order)
1860 struct sk_buff *skb;
1864 timeo = sock_sndtimeo(sk, noblock);
1866 err = sock_error(sk);
1871 if (sk->sk_shutdown & SEND_SHUTDOWN)
1874 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
1877 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1878 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1882 if (signal_pending(current))
1884 timeo = sock_wait_for_wmem(sk, timeo);
1886 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
1887 errcode, sk->sk_allocation);
1889 skb_set_owner_w(skb, sk);
1893 err = sock_intr_errno(timeo);
1898 EXPORT_SYMBOL(sock_alloc_send_pskb);
1900 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1901 int noblock, int *errcode)
1903 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1905 EXPORT_SYMBOL(sock_alloc_send_skb);
1907 int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
1908 struct sockcm_cookie *sockc)
1910 struct cmsghdr *cmsg;
1912 for_each_cmsghdr(cmsg, msg) {
1913 if (!CMSG_OK(msg, cmsg))
1915 if (cmsg->cmsg_level != SOL_SOCKET)
1917 switch (cmsg->cmsg_type) {
1919 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1921 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
1923 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
1931 EXPORT_SYMBOL(sock_cmsg_send);
1933 /* On 32bit arches, an skb frag is limited to 2^15 */
1934 #define SKB_FRAG_PAGE_ORDER get_order(32768)
1937 * skb_page_frag_refill - check that a page_frag contains enough room
1938 * @sz: minimum size of the fragment we want to get
1939 * @pfrag: pointer to page_frag
1940 * @gfp: priority for memory allocation
1942 * Note: While this allocator tries to use high order pages, there is
1943 * no guarantee that allocations succeed. Therefore, @sz MUST be
1944 * less or equal than PAGE_SIZE.
1946 bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
1949 if (atomic_read(&pfrag->page->_count) == 1) {
1953 if (pfrag->offset + sz <= pfrag->size)
1955 put_page(pfrag->page);
1959 if (SKB_FRAG_PAGE_ORDER) {
1960 /* Avoid direct reclaim but allow kswapd to wake */
1961 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
1962 __GFP_COMP | __GFP_NOWARN |
1964 SKB_FRAG_PAGE_ORDER);
1965 if (likely(pfrag->page)) {
1966 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
1970 pfrag->page = alloc_page(gfp);
1971 if (likely(pfrag->page)) {
1972 pfrag->size = PAGE_SIZE;
1977 EXPORT_SYMBOL(skb_page_frag_refill);
1979 bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1981 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1984 sk_enter_memory_pressure(sk);
1985 sk_stream_moderate_sndbuf(sk);
1988 EXPORT_SYMBOL(sk_page_frag_refill);
1990 static void __lock_sock(struct sock *sk)
1991 __releases(&sk->sk_lock.slock)
1992 __acquires(&sk->sk_lock.slock)
1997 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1998 TASK_UNINTERRUPTIBLE);
1999 spin_unlock_bh(&sk->sk_lock.slock);
2001 spin_lock_bh(&sk->sk_lock.slock);
2002 if (!sock_owned_by_user(sk))
2005 finish_wait(&sk->sk_lock.wq, &wait);
2008 static void __release_sock(struct sock *sk)
2009 __releases(&sk->sk_lock.slock)
2010 __acquires(&sk->sk_lock.slock)
2012 struct sk_buff *skb = sk->sk_backlog.head;
2015 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
2019 struct sk_buff *next = skb->next;
2022 WARN_ON_ONCE(skb_dst_is_noref(skb));
2024 sk_backlog_rcv(sk, skb);
2027 * We are in process context here with softirqs
2028 * disabled, use cond_resched_softirq() to preempt.
2029 * This is safe to do because we've taken the backlog
2032 cond_resched_softirq();
2035 } while (skb != NULL);
2038 } while ((skb = sk->sk_backlog.head) != NULL);
2041 * Doing the zeroing here guarantee we can not loop forever
2042 * while a wild producer attempts to flood us.
2044 sk->sk_backlog.len = 0;
2048 * sk_wait_data - wait for data to arrive at sk_receive_queue
2049 * @sk: sock to wait on
2050 * @timeo: for how long
2051 * @skb: last skb seen on sk_receive_queue
2053 * Now socket state including sk->sk_err is changed only under lock,
2054 * hence we may omit checks after joining wait queue.
2055 * We check receive queue before schedule() only as optimization;
2056 * it is very likely that release_sock() added new data.
2058 int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
2063 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2064 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2065 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb);
2066 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2067 finish_wait(sk_sleep(sk), &wait);
2070 EXPORT_SYMBOL(sk_wait_data);
2073 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2075 * @size: memory size to allocate
2076 * @kind: allocation type
2078 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2079 * rmem allocation. This function assumes that protocols which have
2080 * memory_pressure use sk_wmem_queued as write buffer accounting.
2082 int __sk_mem_schedule(struct sock *sk, int size, int kind)
2084 struct proto *prot = sk->sk_prot;
2085 int amt = sk_mem_pages(size);
2088 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
2090 allocated = sk_memory_allocated_add(sk, amt);
2092 if (mem_cgroup_sockets_enabled && sk->sk_cgrp &&
2093 !mem_cgroup_charge_skmem(sk->sk_cgrp, amt))
2094 goto suppress_allocation;
2097 if (allocated <= sk_prot_mem_limits(sk, 0)) {
2098 sk_leave_memory_pressure(sk);
2102 /* Under pressure. */
2103 if (allocated > sk_prot_mem_limits(sk, 1))
2104 sk_enter_memory_pressure(sk);
2106 /* Over hard limit. */
2107 if (allocated > sk_prot_mem_limits(sk, 2))
2108 goto suppress_allocation;
2110 /* guarantee minimum buffer size under pressure */
2111 if (kind == SK_MEM_RECV) {
2112 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2115 } else { /* SK_MEM_SEND */
2116 if (sk->sk_type == SOCK_STREAM) {
2117 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2119 } else if (atomic_read(&sk->sk_wmem_alloc) <
2120 prot->sysctl_wmem[0])
2124 if (sk_has_memory_pressure(sk)) {
2127 if (!sk_under_memory_pressure(sk))
2129 alloc = sk_sockets_allocated_read_positive(sk);
2130 if (sk_prot_mem_limits(sk, 2) > alloc *
2131 sk_mem_pages(sk->sk_wmem_queued +
2132 atomic_read(&sk->sk_rmem_alloc) +
2133 sk->sk_forward_alloc))
2137 suppress_allocation:
2139 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2140 sk_stream_moderate_sndbuf(sk);
2142 /* Fail only if socket is _under_ its sndbuf.
2143 * In this case we cannot block, so that we have to fail.
2145 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2149 trace_sock_exceed_buf_limit(sk, prot, allocated);
2151 /* Alas. Undo changes. */
2152 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
2154 sk_memory_allocated_sub(sk, amt);
2156 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
2157 mem_cgroup_uncharge_skmem(sk->sk_cgrp, amt);
2161 EXPORT_SYMBOL(__sk_mem_schedule);
2164 * __sk_mem_reclaim - reclaim memory_allocated
2166 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
2168 void __sk_mem_reclaim(struct sock *sk, int amount)
2170 amount >>= SK_MEM_QUANTUM_SHIFT;
2171 sk_memory_allocated_sub(sk, amount);
2172 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
2174 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
2175 mem_cgroup_uncharge_skmem(sk->sk_cgrp, amount);
2177 if (sk_under_memory_pressure(sk) &&
2178 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2179 sk_leave_memory_pressure(sk);
2181 EXPORT_SYMBOL(__sk_mem_reclaim);
2185 * Set of default routines for initialising struct proto_ops when
2186 * the protocol does not support a particular function. In certain
2187 * cases where it makes no sense for a protocol to have a "do nothing"
2188 * function, some default processing is provided.
2191 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2195 EXPORT_SYMBOL(sock_no_bind);
2197 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
2202 EXPORT_SYMBOL(sock_no_connect);
2204 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2208 EXPORT_SYMBOL(sock_no_socketpair);
2210 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2214 EXPORT_SYMBOL(sock_no_accept);
2216 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
2221 EXPORT_SYMBOL(sock_no_getname);
2223 unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
2227 EXPORT_SYMBOL(sock_no_poll);
2229 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2233 EXPORT_SYMBOL(sock_no_ioctl);
2235 int sock_no_listen(struct socket *sock, int backlog)
2239 EXPORT_SYMBOL(sock_no_listen);
2241 int sock_no_shutdown(struct socket *sock, int how)
2245 EXPORT_SYMBOL(sock_no_shutdown);
2247 int sock_no_setsockopt(struct socket *sock, int level, int optname,
2248 char __user *optval, unsigned int optlen)
2252 EXPORT_SYMBOL(sock_no_setsockopt);
2254 int sock_no_getsockopt(struct socket *sock, int level, int optname,
2255 char __user *optval, int __user *optlen)
2259 EXPORT_SYMBOL(sock_no_getsockopt);
2261 int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
2265 EXPORT_SYMBOL(sock_no_sendmsg);
2267 int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2272 EXPORT_SYMBOL(sock_no_recvmsg);
2274 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2276 /* Mirror missing mmap method error code */
2279 EXPORT_SYMBOL(sock_no_mmap);
2281 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2284 struct msghdr msg = {.msg_flags = flags};
2286 char *kaddr = kmap(page);
2287 iov.iov_base = kaddr + offset;
2289 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2293 EXPORT_SYMBOL(sock_no_sendpage);
2296 * Default Socket Callbacks
2299 static void sock_def_wakeup(struct sock *sk)
2301 struct socket_wq *wq;
2304 wq = rcu_dereference(sk->sk_wq);
2305 if (skwq_has_sleeper(wq))
2306 wake_up_interruptible_all(&wq->wait);
2310 static void sock_def_error_report(struct sock *sk)
2312 struct socket_wq *wq;
2315 wq = rcu_dereference(sk->sk_wq);
2316 if (skwq_has_sleeper(wq))
2317 wake_up_interruptible_poll(&wq->wait, POLLERR);
2318 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2322 static void sock_def_readable(struct sock *sk)
2324 struct socket_wq *wq;
2327 wq = rcu_dereference(sk->sk_wq);
2328 if (skwq_has_sleeper(wq))
2329 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
2330 POLLRDNORM | POLLRDBAND);
2331 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2335 static void sock_def_write_space(struct sock *sk)
2337 struct socket_wq *wq;
2341 /* Do not wake up a writer until he can make "significant"
2344 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
2345 wq = rcu_dereference(sk->sk_wq);
2346 if (skwq_has_sleeper(wq))
2347 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
2348 POLLWRNORM | POLLWRBAND);
2350 /* Should agree with poll, otherwise some programs break */
2351 if (sock_writeable(sk))
2352 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2358 static void sock_def_destruct(struct sock *sk)
2362 void sk_send_sigurg(struct sock *sk)
2364 if (sk->sk_socket && sk->sk_socket->file)
2365 if (send_sigurg(&sk->sk_socket->file->f_owner))
2366 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2368 EXPORT_SYMBOL(sk_send_sigurg);
2370 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2371 unsigned long expires)
2373 if (!mod_timer(timer, expires))
2376 EXPORT_SYMBOL(sk_reset_timer);
2378 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2380 if (del_timer(timer))
2383 EXPORT_SYMBOL(sk_stop_timer);
2385 void sock_init_data(struct socket *sock, struct sock *sk)
2387 skb_queue_head_init(&sk->sk_receive_queue);
2388 skb_queue_head_init(&sk->sk_write_queue);
2389 skb_queue_head_init(&sk->sk_error_queue);
2391 sk->sk_send_head = NULL;
2393 init_timer(&sk->sk_timer);
2395 sk->sk_allocation = GFP_KERNEL;
2396 sk->sk_rcvbuf = sysctl_rmem_default;
2397 sk->sk_sndbuf = sysctl_wmem_default;
2398 sk->sk_state = TCP_CLOSE;
2399 sk_set_socket(sk, sock);
2401 sock_set_flag(sk, SOCK_ZAPPED);
2404 sk->sk_type = sock->type;
2405 sk->sk_wq = sock->wq;
2410 rwlock_init(&sk->sk_callback_lock);
2411 lockdep_set_class_and_name(&sk->sk_callback_lock,
2412 af_callback_keys + sk->sk_family,
2413 af_family_clock_key_strings[sk->sk_family]);
2415 sk->sk_state_change = sock_def_wakeup;
2416 sk->sk_data_ready = sock_def_readable;
2417 sk->sk_write_space = sock_def_write_space;
2418 sk->sk_error_report = sock_def_error_report;
2419 sk->sk_destruct = sock_def_destruct;
2421 sk->sk_frag.page = NULL;
2422 sk->sk_frag.offset = 0;
2423 sk->sk_peek_off = -1;
2425 sk->sk_peer_pid = NULL;
2426 sk->sk_peer_cred = NULL;
2427 sk->sk_write_pending = 0;
2428 sk->sk_rcvlowat = 1;
2429 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2430 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2432 sk->sk_stamp = ktime_set(-1L, 0);
2434 #ifdef CONFIG_NET_RX_BUSY_POLL
2436 sk->sk_ll_usec = sysctl_net_busy_read;
2439 sk->sk_max_pacing_rate = ~0U;
2440 sk->sk_pacing_rate = ~0U;
2441 sk->sk_incoming_cpu = -1;
2443 * Before updating sk_refcnt, we must commit prior changes to memory
2444 * (Documentation/RCU/rculist_nulls.txt for details)
2447 atomic_set(&sk->sk_refcnt, 1);
2448 atomic_set(&sk->sk_drops, 0);
2450 EXPORT_SYMBOL(sock_init_data);
2452 void lock_sock_nested(struct sock *sk, int subclass)
2455 spin_lock_bh(&sk->sk_lock.slock);
2456 if (sk->sk_lock.owned)
2458 sk->sk_lock.owned = 1;
2459 spin_unlock(&sk->sk_lock.slock);
2461 * The sk_lock has mutex_lock() semantics here:
2463 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2466 EXPORT_SYMBOL(lock_sock_nested);
2468 void release_sock(struct sock *sk)
2471 * The sk_lock has mutex_unlock() semantics:
2473 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2475 spin_lock_bh(&sk->sk_lock.slock);
2476 if (sk->sk_backlog.tail)
2479 /* Warning : release_cb() might need to release sk ownership,
2480 * ie call sock_release_ownership(sk) before us.
2482 if (sk->sk_prot->release_cb)
2483 sk->sk_prot->release_cb(sk);
2485 sock_release_ownership(sk);
2486 if (waitqueue_active(&sk->sk_lock.wq))
2487 wake_up(&sk->sk_lock.wq);
2488 spin_unlock_bh(&sk->sk_lock.slock);
2490 EXPORT_SYMBOL(release_sock);
2493 * lock_sock_fast - fast version of lock_sock
2496 * This version should be used for very small section, where process wont block
2497 * return false if fast path is taken
2498 * sk_lock.slock locked, owned = 0, BH disabled
2499 * return true if slow path is taken
2500 * sk_lock.slock unlocked, owned = 1, BH enabled
2502 bool lock_sock_fast(struct sock *sk)
2505 spin_lock_bh(&sk->sk_lock.slock);
2507 if (!sk->sk_lock.owned)
2509 * Note : We must disable BH
2514 sk->sk_lock.owned = 1;
2515 spin_unlock(&sk->sk_lock.slock);
2517 * The sk_lock has mutex_lock() semantics here:
2519 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2523 EXPORT_SYMBOL(lock_sock_fast);
2525 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2528 if (!sock_flag(sk, SOCK_TIMESTAMP))
2529 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2530 tv = ktime_to_timeval(sk->sk_stamp);
2531 if (tv.tv_sec == -1)
2533 if (tv.tv_sec == 0) {
2534 sk->sk_stamp = ktime_get_real();
2535 tv = ktime_to_timeval(sk->sk_stamp);
2537 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
2539 EXPORT_SYMBOL(sock_get_timestamp);
2541 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2544 if (!sock_flag(sk, SOCK_TIMESTAMP))
2545 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2546 ts = ktime_to_timespec(sk->sk_stamp);
2547 if (ts.tv_sec == -1)
2549 if (ts.tv_sec == 0) {
2550 sk->sk_stamp = ktime_get_real();
2551 ts = ktime_to_timespec(sk->sk_stamp);
2553 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2555 EXPORT_SYMBOL(sock_get_timestampns);
2557 void sock_enable_timestamp(struct sock *sk, int flag)
2559 if (!sock_flag(sk, flag)) {
2560 unsigned long previous_flags = sk->sk_flags;
2562 sock_set_flag(sk, flag);
2564 * we just set one of the two flags which require net
2565 * time stamping, but time stamping might have been on
2566 * already because of the other one
2568 if (sock_needs_netstamp(sk) &&
2569 !(previous_flags & SK_FLAGS_TIMESTAMP))
2570 net_enable_timestamp();
2574 int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2575 int level, int type)
2577 struct sock_exterr_skb *serr;
2578 struct sk_buff *skb;
2582 skb = sock_dequeue_err_skb(sk);
2588 msg->msg_flags |= MSG_TRUNC;
2591 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2595 sock_recv_timestamp(msg, sk, skb);
2597 serr = SKB_EXT_ERR(skb);
2598 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2600 msg->msg_flags |= MSG_ERRQUEUE;
2608 EXPORT_SYMBOL(sock_recv_errqueue);
2611 * Get a socket option on an socket.
2613 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2614 * asynchronous errors should be reported by getsockopt. We assume
2615 * this means if you specify SO_ERROR (otherwise whats the point of it).
2617 int sock_common_getsockopt(struct socket *sock, int level, int optname,
2618 char __user *optval, int __user *optlen)
2620 struct sock *sk = sock->sk;
2622 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2624 EXPORT_SYMBOL(sock_common_getsockopt);
2626 #ifdef CONFIG_COMPAT
2627 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2628 char __user *optval, int __user *optlen)
2630 struct sock *sk = sock->sk;
2632 if (sk->sk_prot->compat_getsockopt != NULL)
2633 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2635 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2637 EXPORT_SYMBOL(compat_sock_common_getsockopt);
2640 int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2643 struct sock *sk = sock->sk;
2647 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
2648 flags & ~MSG_DONTWAIT, &addr_len);
2650 msg->msg_namelen = addr_len;
2653 EXPORT_SYMBOL(sock_common_recvmsg);
2656 * Set socket options on an inet socket.
2658 int sock_common_setsockopt(struct socket *sock, int level, int optname,
2659 char __user *optval, unsigned int optlen)
2661 struct sock *sk = sock->sk;
2663 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2665 EXPORT_SYMBOL(sock_common_setsockopt);
2667 #ifdef CONFIG_COMPAT
2668 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2669 char __user *optval, unsigned int optlen)
2671 struct sock *sk = sock->sk;
2673 if (sk->sk_prot->compat_setsockopt != NULL)
2674 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2676 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2678 EXPORT_SYMBOL(compat_sock_common_setsockopt);
2681 void sk_common_release(struct sock *sk)
2683 if (sk->sk_prot->destroy)
2684 sk->sk_prot->destroy(sk);
2687 * Observation: when sock_common_release is called, processes have
2688 * no access to socket. But net still has.
2689 * Step one, detach it from networking:
2691 * A. Remove from hash tables.
2694 sk->sk_prot->unhash(sk);
2697 * In this point socket cannot receive new packets, but it is possible
2698 * that some packets are in flight because some CPU runs receiver and
2699 * did hash table lookup before we unhashed socket. They will achieve
2700 * receive queue and will be purged by socket destructor.
2702 * Also we still have packets pending on receive queue and probably,
2703 * our own packets waiting in device queues. sock_destroy will drain
2704 * receive queue, but transmitted packets will delay socket destruction
2705 * until the last reference will be released.
2710 xfrm_sk_free_policy(sk);
2712 sk_refcnt_debug_release(sk);
2714 if (sk->sk_frag.page) {
2715 put_page(sk->sk_frag.page);
2716 sk->sk_frag.page = NULL;
2721 EXPORT_SYMBOL(sk_common_release);
2723 #ifdef CONFIG_PROC_FS
2724 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
2726 int val[PROTO_INUSE_NR];
2729 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2731 #ifdef CONFIG_NET_NS
2732 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2734 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
2736 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2738 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2740 int cpu, idx = prot->inuse_idx;
2743 for_each_possible_cpu(cpu)
2744 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2746 return res >= 0 ? res : 0;
2748 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2750 static int __net_init sock_inuse_init_net(struct net *net)
2752 net->core.inuse = alloc_percpu(struct prot_inuse);
2753 return net->core.inuse ? 0 : -ENOMEM;
2756 static void __net_exit sock_inuse_exit_net(struct net *net)
2758 free_percpu(net->core.inuse);
2761 static struct pernet_operations net_inuse_ops = {
2762 .init = sock_inuse_init_net,
2763 .exit = sock_inuse_exit_net,
2766 static __init int net_inuse_init(void)
2768 if (register_pernet_subsys(&net_inuse_ops))
2769 panic("Cannot initialize net inuse counters");
2774 core_initcall(net_inuse_init);
2776 static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2778 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2780 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
2782 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2784 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2786 int cpu, idx = prot->inuse_idx;
2789 for_each_possible_cpu(cpu)
2790 res += per_cpu(prot_inuse, cpu).val[idx];
2792 return res >= 0 ? res : 0;
2794 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2797 static void assign_proto_idx(struct proto *prot)
2799 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2801 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2802 pr_err("PROTO_INUSE_NR exhausted\n");
2806 set_bit(prot->inuse_idx, proto_inuse_idx);
2809 static void release_proto_idx(struct proto *prot)
2811 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2812 clear_bit(prot->inuse_idx, proto_inuse_idx);
2815 static inline void assign_proto_idx(struct proto *prot)
2819 static inline void release_proto_idx(struct proto *prot)
2824 static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
2828 kfree(rsk_prot->slab_name);
2829 rsk_prot->slab_name = NULL;
2830 kmem_cache_destroy(rsk_prot->slab);
2831 rsk_prot->slab = NULL;
2834 static int req_prot_init(const struct proto *prot)
2836 struct request_sock_ops *rsk_prot = prot->rsk_prot;
2841 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
2843 if (!rsk_prot->slab_name)
2846 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
2847 rsk_prot->obj_size, 0,
2848 prot->slab_flags, NULL);
2850 if (!rsk_prot->slab) {
2851 pr_crit("%s: Can't create request sock SLAB cache!\n",
2858 int proto_register(struct proto *prot, int alloc_slab)
2861 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2862 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2865 if (prot->slab == NULL) {
2866 pr_crit("%s: Can't create sock SLAB cache!\n",
2871 if (req_prot_init(prot))
2872 goto out_free_request_sock_slab;
2874 if (prot->twsk_prot != NULL) {
2875 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
2877 if (prot->twsk_prot->twsk_slab_name == NULL)
2878 goto out_free_request_sock_slab;
2880 prot->twsk_prot->twsk_slab =
2881 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2882 prot->twsk_prot->twsk_obj_size,
2886 if (prot->twsk_prot->twsk_slab == NULL)
2887 goto out_free_timewait_sock_slab_name;
2891 mutex_lock(&proto_list_mutex);
2892 list_add(&prot->node, &proto_list);
2893 assign_proto_idx(prot);
2894 mutex_unlock(&proto_list_mutex);
2897 out_free_timewait_sock_slab_name:
2898 kfree(prot->twsk_prot->twsk_slab_name);
2899 out_free_request_sock_slab:
2900 req_prot_cleanup(prot->rsk_prot);
2902 kmem_cache_destroy(prot->slab);
2907 EXPORT_SYMBOL(proto_register);
2909 void proto_unregister(struct proto *prot)
2911 mutex_lock(&proto_list_mutex);
2912 release_proto_idx(prot);
2913 list_del(&prot->node);
2914 mutex_unlock(&proto_list_mutex);
2916 kmem_cache_destroy(prot->slab);
2919 req_prot_cleanup(prot->rsk_prot);
2921 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2922 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2923 kfree(prot->twsk_prot->twsk_slab_name);
2924 prot->twsk_prot->twsk_slab = NULL;
2927 EXPORT_SYMBOL(proto_unregister);
2929 #ifdef CONFIG_PROC_FS
2930 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2931 __acquires(proto_list_mutex)
2933 mutex_lock(&proto_list_mutex);
2934 return seq_list_start_head(&proto_list, *pos);
2937 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2939 return seq_list_next(v, &proto_list, pos);
2942 static void proto_seq_stop(struct seq_file *seq, void *v)
2943 __releases(proto_list_mutex)
2945 mutex_unlock(&proto_list_mutex);
2948 static char proto_method_implemented(const void *method)
2950 return method == NULL ? 'n' : 'y';
2952 static long sock_prot_memory_allocated(struct proto *proto)
2954 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
2957 static char *sock_prot_memory_pressure(struct proto *proto)
2959 return proto->memory_pressure != NULL ?
2960 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2963 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2966 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
2967 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2970 sock_prot_inuse_get(seq_file_net(seq), proto),
2971 sock_prot_memory_allocated(proto),
2972 sock_prot_memory_pressure(proto),
2974 proto->slab == NULL ? "no" : "yes",
2975 module_name(proto->owner),
2976 proto_method_implemented(proto->close),
2977 proto_method_implemented(proto->connect),
2978 proto_method_implemented(proto->disconnect),
2979 proto_method_implemented(proto->accept),
2980 proto_method_implemented(proto->ioctl),
2981 proto_method_implemented(proto->init),
2982 proto_method_implemented(proto->destroy),
2983 proto_method_implemented(proto->shutdown),
2984 proto_method_implemented(proto->setsockopt),
2985 proto_method_implemented(proto->getsockopt),
2986 proto_method_implemented(proto->sendmsg),
2987 proto_method_implemented(proto->recvmsg),
2988 proto_method_implemented(proto->sendpage),
2989 proto_method_implemented(proto->bind),
2990 proto_method_implemented(proto->backlog_rcv),
2991 proto_method_implemented(proto->hash),
2992 proto_method_implemented(proto->unhash),
2993 proto_method_implemented(proto->get_port),
2994 proto_method_implemented(proto->enter_memory_pressure));
2997 static int proto_seq_show(struct seq_file *seq, void *v)
2999 if (v == &proto_list)
3000 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3009 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3011 proto_seq_printf(seq, list_entry(v, struct proto, node));
3015 static const struct seq_operations proto_seq_ops = {
3016 .start = proto_seq_start,
3017 .next = proto_seq_next,
3018 .stop = proto_seq_stop,
3019 .show = proto_seq_show,
3022 static int proto_seq_open(struct inode *inode, struct file *file)
3024 return seq_open_net(inode, file, &proto_seq_ops,
3025 sizeof(struct seq_net_private));
3028 static const struct file_operations proto_seq_fops = {
3029 .owner = THIS_MODULE,
3030 .open = proto_seq_open,
3032 .llseek = seq_lseek,
3033 .release = seq_release_net,
3036 static __net_init int proto_init_net(struct net *net)
3038 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
3044 static __net_exit void proto_exit_net(struct net *net)
3046 remove_proc_entry("protocols", net->proc_net);
3050 static __net_initdata struct pernet_operations proto_net_ops = {
3051 .init = proto_init_net,
3052 .exit = proto_exit_net,
3055 static int __init proto_init(void)
3057 return register_pernet_subsys(&proto_net_ops);
3060 subsys_initcall(proto_init);
3062 #endif /* PROC_FS */