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>
135 #include <linux/filter.h>
137 #include <trace/events/sock.h>
143 #include <net/busy_poll.h>
145 static DEFINE_MUTEX(proto_list_mutex);
146 static LIST_HEAD(proto_list);
149 * sk_ns_capable - General socket capability test
150 * @sk: Socket to use a capability on or through
151 * @user_ns: The user namespace of the capability to use
152 * @cap: The capability to use
154 * Test to see if the opener of the socket had when the socket was
155 * created and the current process has the capability @cap in the user
156 * namespace @user_ns.
158 bool sk_ns_capable(const struct sock *sk,
159 struct user_namespace *user_ns, int cap)
161 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
162 ns_capable(user_ns, cap);
164 EXPORT_SYMBOL(sk_ns_capable);
167 * sk_capable - Socket global capability test
168 * @sk: Socket to use a capability on or through
169 * @cap: The global capbility to use
171 * Test to see if the opener of the socket had when the socket was
172 * created and the current process has the capability @cap in all user
175 bool sk_capable(const struct sock *sk, int cap)
177 return sk_ns_capable(sk, &init_user_ns, cap);
179 EXPORT_SYMBOL(sk_capable);
182 * sk_net_capable - Network namespace socket capability test
183 * @sk: Socket to use a capability on or through
184 * @cap: The capability to use
186 * Test to see if the opener of the socket had when the socke was created
187 * and the current process has the capability @cap over the network namespace
188 * the socket is a member of.
190 bool sk_net_capable(const struct sock *sk, int cap)
192 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
194 EXPORT_SYMBOL(sk_net_capable);
197 #ifdef CONFIG_MEMCG_KMEM
198 int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
203 mutex_lock(&proto_list_mutex);
204 list_for_each_entry(proto, &proto_list, node) {
205 if (proto->init_cgroup) {
206 ret = proto->init_cgroup(memcg, ss);
212 mutex_unlock(&proto_list_mutex);
215 list_for_each_entry_continue_reverse(proto, &proto_list, node)
216 if (proto->destroy_cgroup)
217 proto->destroy_cgroup(memcg);
218 mutex_unlock(&proto_list_mutex);
222 void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
226 mutex_lock(&proto_list_mutex);
227 list_for_each_entry_reverse(proto, &proto_list, node)
228 if (proto->destroy_cgroup)
229 proto->destroy_cgroup(memcg);
230 mutex_unlock(&proto_list_mutex);
235 * Each address family might have different locking rules, so we have
236 * one slock key per address family:
238 static struct lock_class_key af_family_keys[AF_MAX];
239 static struct lock_class_key af_family_slock_keys[AF_MAX];
241 #if defined(CONFIG_MEMCG_KMEM)
242 struct static_key memcg_socket_limit_enabled;
243 EXPORT_SYMBOL(memcg_socket_limit_enabled);
247 * Make lock validator output more readable. (we pre-construct these
248 * strings build-time, so that runtime initialization of socket
251 static const char *const af_family_key_strings[AF_MAX+1] = {
252 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
253 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
254 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
255 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
256 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
257 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
258 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
259 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
260 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
261 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
262 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
263 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
264 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
265 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX"
267 static const char *const af_family_slock_key_strings[AF_MAX+1] = {
268 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
269 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
270 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
271 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
272 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
273 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
274 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
275 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
276 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
277 "slock-27" , "slock-28" , "slock-AF_CAN" ,
278 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
279 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
280 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
281 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX"
283 static const char *const af_family_clock_key_strings[AF_MAX+1] = {
284 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
285 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
286 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
287 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
288 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
289 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
290 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
291 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
292 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
293 "clock-27" , "clock-28" , "clock-AF_CAN" ,
294 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
295 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
296 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
297 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX"
301 * sk_callback_lock locking rules are per-address-family,
302 * so split the lock classes by using a per-AF key:
304 static struct lock_class_key af_callback_keys[AF_MAX];
306 /* Take into consideration the size of the struct sk_buff overhead in the
307 * determination of these values, since that is non-constant across
308 * platforms. This makes socket queueing behavior and performance
309 * not depend upon such differences.
311 #define _SK_MEM_PACKETS 256
312 #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
313 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
314 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
316 /* Run time adjustable parameters. */
317 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
318 EXPORT_SYMBOL(sysctl_wmem_max);
319 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
320 EXPORT_SYMBOL(sysctl_rmem_max);
321 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
322 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
324 /* Maximal space eaten by iovec or ancillary data plus some space */
325 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
326 EXPORT_SYMBOL(sysctl_optmem_max);
328 struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
329 EXPORT_SYMBOL_GPL(memalloc_socks);
332 * sk_set_memalloc - sets %SOCK_MEMALLOC
333 * @sk: socket to set it on
335 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
336 * It's the responsibility of the admin to adjust min_free_kbytes
337 * to meet the requirements
339 void sk_set_memalloc(struct sock *sk)
341 sock_set_flag(sk, SOCK_MEMALLOC);
342 sk->sk_allocation |= __GFP_MEMALLOC;
343 static_key_slow_inc(&memalloc_socks);
345 EXPORT_SYMBOL_GPL(sk_set_memalloc);
347 void sk_clear_memalloc(struct sock *sk)
349 sock_reset_flag(sk, SOCK_MEMALLOC);
350 sk->sk_allocation &= ~__GFP_MEMALLOC;
351 static_key_slow_dec(&memalloc_socks);
354 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
355 * progress of swapping. However, if SOCK_MEMALLOC is cleared while
356 * it has rmem allocations there is a risk that the user of the
357 * socket cannot make forward progress due to exceeding the rmem
358 * limits. By rights, sk_clear_memalloc() should only be called
359 * on sockets being torn down but warn and reset the accounting if
360 * that assumption breaks.
362 if (WARN_ON(sk->sk_forward_alloc))
365 EXPORT_SYMBOL_GPL(sk_clear_memalloc);
367 int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
370 unsigned long pflags = current->flags;
372 /* these should have been dropped before queueing */
373 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
375 current->flags |= PF_MEMALLOC;
376 ret = sk->sk_backlog_rcv(sk, skb);
377 tsk_restore_flags(current, pflags, PF_MEMALLOC);
381 EXPORT_SYMBOL(__sk_backlog_rcv);
383 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
387 if (optlen < sizeof(tv))
389 if (copy_from_user(&tv, optval, sizeof(tv)))
391 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
395 static int warned __read_mostly;
398 if (warned < 10 && net_ratelimit()) {
400 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
401 __func__, current->comm, task_pid_nr(current));
405 *timeo_p = MAX_SCHEDULE_TIMEOUT;
406 if (tv.tv_sec == 0 && tv.tv_usec == 0)
408 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
409 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
413 static void sock_warn_obsolete_bsdism(const char *name)
416 static char warncomm[TASK_COMM_LEN];
417 if (strcmp(warncomm, current->comm) && warned < 5) {
418 strcpy(warncomm, current->comm);
419 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
425 #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
427 static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
429 if (sk->sk_flags & flags) {
430 sk->sk_flags &= ~flags;
431 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
432 net_disable_timestamp();
437 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
442 struct sk_buff_head *list = &sk->sk_receive_queue;
444 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
445 atomic_inc(&sk->sk_drops);
446 trace_sock_rcvqueue_full(sk, skb);
450 err = sk_filter(sk, skb);
454 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
455 atomic_inc(&sk->sk_drops);
460 skb_set_owner_r(skb, sk);
462 /* Cache the SKB length before we tack it onto the receive
463 * queue. Once it is added it no longer belongs to us and
464 * may be freed by other threads of control pulling packets
469 /* we escape from rcu protected region, make sure we dont leak
474 spin_lock_irqsave(&list->lock, flags);
475 skb->dropcount = atomic_read(&sk->sk_drops);
476 __skb_queue_tail(list, skb);
477 spin_unlock_irqrestore(&list->lock, flags);
479 if (!sock_flag(sk, SOCK_DEAD))
480 sk->sk_data_ready(sk);
483 EXPORT_SYMBOL(sock_queue_rcv_skb);
485 int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
487 int rc = NET_RX_SUCCESS;
489 if (sk_filter(sk, skb))
490 goto discard_and_relse;
494 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) {
495 atomic_inc(&sk->sk_drops);
496 goto discard_and_relse;
499 bh_lock_sock_nested(sk);
502 if (!sock_owned_by_user(sk)) {
504 * trylock + unlock semantics:
506 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
508 rc = sk_backlog_rcv(sk, skb);
510 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
511 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
513 atomic_inc(&sk->sk_drops);
514 goto discard_and_relse;
525 EXPORT_SYMBOL(sk_receive_skb);
527 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
529 struct dst_entry *dst = __sk_dst_get(sk);
531 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
532 sk_tx_queue_clear(sk);
533 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
540 EXPORT_SYMBOL(__sk_dst_check);
542 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
544 struct dst_entry *dst = sk_dst_get(sk);
546 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
554 EXPORT_SYMBOL(sk_dst_check);
556 static int sock_setbindtodevice(struct sock *sk, char __user *optval,
559 int ret = -ENOPROTOOPT;
560 #ifdef CONFIG_NETDEVICES
561 struct net *net = sock_net(sk);
562 char devname[IFNAMSIZ];
567 if (!ns_capable(net->user_ns, CAP_NET_RAW))
574 /* Bind this socket to a particular device like "eth0",
575 * as specified in the passed interface name. If the
576 * name is "" or the option length is zero the socket
579 if (optlen > IFNAMSIZ - 1)
580 optlen = IFNAMSIZ - 1;
581 memset(devname, 0, sizeof(devname));
584 if (copy_from_user(devname, optval, optlen))
588 if (devname[0] != '\0') {
589 struct net_device *dev;
592 dev = dev_get_by_name_rcu(net, devname);
594 index = dev->ifindex;
602 sk->sk_bound_dev_if = index;
614 static int sock_getbindtodevice(struct sock *sk, char __user *optval,
615 int __user *optlen, int len)
617 int ret = -ENOPROTOOPT;
618 #ifdef CONFIG_NETDEVICES
619 struct net *net = sock_net(sk);
620 char devname[IFNAMSIZ];
622 if (sk->sk_bound_dev_if == 0) {
631 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
635 len = strlen(devname) + 1;
638 if (copy_to_user(optval, devname, len))
643 if (put_user(len, optlen))
654 static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
657 sock_set_flag(sk, bit);
659 sock_reset_flag(sk, bit);
663 * This is meant for all protocols to use and covers goings on
664 * at the socket level. Everything here is generic.
667 int sock_setsockopt(struct socket *sock, int level, int optname,
668 char __user *optval, unsigned int optlen)
670 struct sock *sk = sock->sk;
677 * Options without arguments
680 if (optname == SO_BINDTODEVICE)
681 return sock_setbindtodevice(sk, optval, optlen);
683 if (optlen < sizeof(int))
686 if (get_user(val, (int __user *)optval))
689 valbool = val ? 1 : 0;
695 if (val && !capable(CAP_NET_ADMIN))
698 sock_valbool_flag(sk, SOCK_DBG, valbool);
701 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
704 sk->sk_reuseport = valbool;
713 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
716 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
719 /* Don't error on this BSD doesn't and if you think
720 * about it this is right. Otherwise apps have to
721 * play 'guess the biggest size' games. RCVBUF/SNDBUF
722 * are treated in BSD as hints
724 val = min_t(u32, val, sysctl_wmem_max);
726 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
727 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
728 /* Wake up sending tasks if we upped the value. */
729 sk->sk_write_space(sk);
733 if (!capable(CAP_NET_ADMIN)) {
740 /* Don't error on this BSD doesn't and if you think
741 * about it this is right. Otherwise apps have to
742 * play 'guess the biggest size' games. RCVBUF/SNDBUF
743 * are treated in BSD as hints
745 val = min_t(u32, val, sysctl_rmem_max);
747 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
749 * We double it on the way in to account for
750 * "struct sk_buff" etc. overhead. Applications
751 * assume that the SO_RCVBUF setting they make will
752 * allow that much actual data to be received on that
755 * Applications are unaware that "struct sk_buff" and
756 * other overheads allocate from the receive buffer
757 * during socket buffer allocation.
759 * And after considering the possible alternatives,
760 * returning the value we actually used in getsockopt
761 * is the most desirable behavior.
763 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
767 if (!capable(CAP_NET_ADMIN)) {
775 if (sk->sk_protocol == IPPROTO_TCP &&
776 sk->sk_type == SOCK_STREAM)
777 tcp_set_keepalive(sk, valbool);
779 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
783 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
787 sk->sk_no_check_tx = valbool;
791 if ((val >= 0 && val <= 6) ||
792 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
793 sk->sk_priority = val;
799 if (optlen < sizeof(ling)) {
800 ret = -EINVAL; /* 1003.1g */
803 if (copy_from_user(&ling, optval, sizeof(ling))) {
808 sock_reset_flag(sk, SOCK_LINGER);
810 #if (BITS_PER_LONG == 32)
811 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
812 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
815 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
816 sock_set_flag(sk, SOCK_LINGER);
821 sock_warn_obsolete_bsdism("setsockopt");
826 set_bit(SOCK_PASSCRED, &sock->flags);
828 clear_bit(SOCK_PASSCRED, &sock->flags);
834 if (optname == SO_TIMESTAMP)
835 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
837 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
838 sock_set_flag(sk, SOCK_RCVTSTAMP);
839 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
841 sock_reset_flag(sk, SOCK_RCVTSTAMP);
842 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
846 case SO_TIMESTAMPING:
847 if (val & ~SOF_TIMESTAMPING_MASK) {
851 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
852 val & SOF_TIMESTAMPING_TX_HARDWARE);
853 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
854 val & SOF_TIMESTAMPING_TX_SOFTWARE);
855 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
856 val & SOF_TIMESTAMPING_RX_HARDWARE);
857 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
858 sock_enable_timestamp(sk,
859 SOCK_TIMESTAMPING_RX_SOFTWARE);
861 sock_disable_timestamp(sk,
862 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
863 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
864 val & SOF_TIMESTAMPING_SOFTWARE);
865 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
866 val & SOF_TIMESTAMPING_SYS_HARDWARE);
867 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
868 val & SOF_TIMESTAMPING_RAW_HARDWARE);
874 sk->sk_rcvlowat = val ? : 1;
878 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
882 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
885 case SO_ATTACH_FILTER:
887 if (optlen == sizeof(struct sock_fprog)) {
888 struct sock_fprog fprog;
891 if (copy_from_user(&fprog, optval, sizeof(fprog)))
894 ret = sk_attach_filter(&fprog, sk);
898 case SO_DETACH_FILTER:
899 ret = sk_detach_filter(sk);
903 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
906 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
911 set_bit(SOCK_PASSSEC, &sock->flags);
913 clear_bit(SOCK_PASSSEC, &sock->flags);
916 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
922 /* We implement the SO_SNDLOWAT etc to
923 not be settable (1003.1g 5.3) */
925 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
929 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
933 if (sock->ops->set_peek_off)
934 ret = sock->ops->set_peek_off(sk, val);
940 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
943 case SO_SELECT_ERR_QUEUE:
944 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
947 #ifdef CONFIG_NET_RX_BUSY_POLL
949 /* allow unprivileged users to decrease the value */
950 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
956 sk->sk_ll_usec = val;
961 case SO_MAX_PACING_RATE:
962 sk->sk_max_pacing_rate = val;
963 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
964 sk->sk_max_pacing_rate);
974 EXPORT_SYMBOL(sock_setsockopt);
977 static void cred_to_ucred(struct pid *pid, const struct cred *cred,
980 ucred->pid = pid_vnr(pid);
981 ucred->uid = ucred->gid = -1;
983 struct user_namespace *current_ns = current_user_ns();
985 ucred->uid = from_kuid_munged(current_ns, cred->euid);
986 ucred->gid = from_kgid_munged(current_ns, cred->egid);
990 int sock_getsockopt(struct socket *sock, int level, int optname,
991 char __user *optval, int __user *optlen)
993 struct sock *sk = sock->sk;
1001 int lv = sizeof(int);
1004 if (get_user(len, optlen))
1009 memset(&v, 0, sizeof(v));
1013 v.val = sock_flag(sk, SOCK_DBG);
1017 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1021 v.val = sock_flag(sk, SOCK_BROADCAST);
1025 v.val = sk->sk_sndbuf;
1029 v.val = sk->sk_rcvbuf;
1033 v.val = sk->sk_reuse;
1037 v.val = sk->sk_reuseport;
1041 v.val = sock_flag(sk, SOCK_KEEPOPEN);
1045 v.val = sk->sk_type;
1049 v.val = sk->sk_protocol;
1053 v.val = sk->sk_family;
1057 v.val = -sock_error(sk);
1059 v.val = xchg(&sk->sk_err_soft, 0);
1063 v.val = sock_flag(sk, SOCK_URGINLINE);
1067 v.val = sk->sk_no_check_tx;
1071 v.val = sk->sk_priority;
1075 lv = sizeof(v.ling);
1076 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
1077 v.ling.l_linger = sk->sk_lingertime / HZ;
1081 sock_warn_obsolete_bsdism("getsockopt");
1085 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1086 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1089 case SO_TIMESTAMPNS:
1090 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
1093 case SO_TIMESTAMPING:
1095 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
1096 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
1097 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
1098 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
1099 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
1100 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
1101 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1102 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
1103 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
1104 v.val |= SOF_TIMESTAMPING_SOFTWARE;
1105 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
1106 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
1107 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
1108 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
1112 lv = sizeof(struct timeval);
1113 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1117 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1118 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1123 lv = sizeof(struct timeval);
1124 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1128 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1129 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1134 v.val = sk->sk_rcvlowat;
1142 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1147 struct ucred peercred;
1148 if (len > sizeof(peercred))
1149 len = sizeof(peercred);
1150 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1151 if (copy_to_user(optval, &peercred, len))
1160 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1164 if (copy_to_user(optval, address, len))
1169 /* Dubious BSD thing... Probably nobody even uses it, but
1170 * the UNIX standard wants it for whatever reason... -DaveM
1173 v.val = sk->sk_state == TCP_LISTEN;
1177 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1181 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1184 v.val = sk->sk_mark;
1188 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1191 case SO_WIFI_STATUS:
1192 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1196 if (!sock->ops->set_peek_off)
1199 v.val = sk->sk_peek_off;
1202 v.val = sock_flag(sk, SOCK_NOFCS);
1205 case SO_BINDTODEVICE:
1206 return sock_getbindtodevice(sk, optval, optlen, len);
1209 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1215 case SO_LOCK_FILTER:
1216 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1219 case SO_BPF_EXTENSIONS:
1220 v.val = bpf_tell_extensions();
1223 case SO_SELECT_ERR_QUEUE:
1224 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1227 #ifdef CONFIG_NET_RX_BUSY_POLL
1229 v.val = sk->sk_ll_usec;
1233 case SO_MAX_PACING_RATE:
1234 v.val = sk->sk_max_pacing_rate;
1238 return -ENOPROTOOPT;
1243 if (copy_to_user(optval, &v, len))
1246 if (put_user(len, optlen))
1252 * Initialize an sk_lock.
1254 * (We also register the sk_lock with the lock validator.)
1256 static inline void sock_lock_init(struct sock *sk)
1258 sock_lock_init_class_and_name(sk,
1259 af_family_slock_key_strings[sk->sk_family],
1260 af_family_slock_keys + sk->sk_family,
1261 af_family_key_strings[sk->sk_family],
1262 af_family_keys + sk->sk_family);
1266 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1267 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1268 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1270 static void sock_copy(struct sock *nsk, const struct sock *osk)
1272 #ifdef CONFIG_SECURITY_NETWORK
1273 void *sptr = nsk->sk_security;
1275 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1277 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1278 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1280 #ifdef CONFIG_SECURITY_NETWORK
1281 nsk->sk_security = sptr;
1282 security_sk_clone(osk, nsk);
1286 void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1288 unsigned long nulls1, nulls2;
1290 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1291 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1292 if (nulls1 > nulls2)
1293 swap(nulls1, nulls2);
1296 memset((char *)sk, 0, nulls1);
1297 memset((char *)sk + nulls1 + sizeof(void *), 0,
1298 nulls2 - nulls1 - sizeof(void *));
1299 memset((char *)sk + nulls2 + sizeof(void *), 0,
1300 size - nulls2 - sizeof(void *));
1302 EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1304 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1308 struct kmem_cache *slab;
1312 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1315 if (priority & __GFP_ZERO) {
1317 prot->clear_sk(sk, prot->obj_size);
1319 sk_prot_clear_nulls(sk, prot->obj_size);
1322 sk = kmalloc(prot->obj_size, priority);
1325 kmemcheck_annotate_bitfield(sk, flags);
1327 if (security_sk_alloc(sk, family, priority))
1330 if (!try_module_get(prot->owner))
1332 sk_tx_queue_clear(sk);
1338 security_sk_free(sk);
1341 kmem_cache_free(slab, sk);
1347 static void sk_prot_free(struct proto *prot, struct sock *sk)
1349 struct kmem_cache *slab;
1350 struct module *owner;
1352 owner = prot->owner;
1355 security_sk_free(sk);
1357 kmem_cache_free(slab, sk);
1363 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
1364 void sock_update_netprioidx(struct sock *sk)
1369 sk->sk_cgrp_prioidx = task_netprioidx(current);
1371 EXPORT_SYMBOL_GPL(sock_update_netprioidx);
1375 * sk_alloc - All socket objects are allocated here
1376 * @net: the applicable net namespace
1377 * @family: protocol family
1378 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1379 * @prot: struct proto associated with this new sock instance
1381 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1386 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1388 sk->sk_family = family;
1390 * See comment in struct sock definition to understand
1391 * why we need sk_prot_creator -acme
1393 sk->sk_prot = sk->sk_prot_creator = prot;
1395 sock_net_set(sk, get_net(net));
1396 atomic_set(&sk->sk_wmem_alloc, 1);
1398 sock_update_classid(sk);
1399 sock_update_netprioidx(sk);
1404 EXPORT_SYMBOL(sk_alloc);
1406 static void __sk_free(struct sock *sk)
1408 struct sk_filter *filter;
1410 if (sk->sk_destruct)
1411 sk->sk_destruct(sk);
1413 filter = rcu_dereference_check(sk->sk_filter,
1414 atomic_read(&sk->sk_wmem_alloc) == 0);
1416 sk_filter_uncharge(sk, filter);
1417 RCU_INIT_POINTER(sk->sk_filter, NULL);
1420 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1422 if (atomic_read(&sk->sk_omem_alloc))
1423 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1424 __func__, atomic_read(&sk->sk_omem_alloc));
1426 if (sk->sk_peer_cred)
1427 put_cred(sk->sk_peer_cred);
1428 put_pid(sk->sk_peer_pid);
1429 put_net(sock_net(sk));
1430 sk_prot_free(sk->sk_prot_creator, sk);
1433 void sk_free(struct sock *sk)
1436 * We subtract one from sk_wmem_alloc and can know if
1437 * some packets are still in some tx queue.
1438 * If not null, sock_wfree() will call __sk_free(sk) later
1440 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1443 EXPORT_SYMBOL(sk_free);
1446 * Last sock_put should drop reference to sk->sk_net. It has already
1447 * been dropped in sk_change_net. Taking reference to stopping namespace
1449 * Take reference to a socket to remove it from hash _alive_ and after that
1450 * destroy it in the context of init_net.
1452 void sk_release_kernel(struct sock *sk)
1454 if (sk == NULL || sk->sk_socket == NULL)
1458 sock_release(sk->sk_socket);
1459 release_net(sock_net(sk));
1460 sock_net_set(sk, get_net(&init_net));
1463 EXPORT_SYMBOL(sk_release_kernel);
1465 static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1467 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1468 sock_update_memcg(newsk);
1472 * sk_clone_lock - clone a socket, and lock its clone
1473 * @sk: the socket to clone
1474 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1476 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1478 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1482 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1483 if (newsk != NULL) {
1484 struct sk_filter *filter;
1486 sock_copy(newsk, sk);
1489 get_net(sock_net(newsk));
1490 sk_node_init(&newsk->sk_node);
1491 sock_lock_init(newsk);
1492 bh_lock_sock(newsk);
1493 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1494 newsk->sk_backlog.len = 0;
1496 atomic_set(&newsk->sk_rmem_alloc, 0);
1498 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1500 atomic_set(&newsk->sk_wmem_alloc, 1);
1501 atomic_set(&newsk->sk_omem_alloc, 0);
1502 skb_queue_head_init(&newsk->sk_receive_queue);
1503 skb_queue_head_init(&newsk->sk_write_queue);
1504 #ifdef CONFIG_NET_DMA
1505 skb_queue_head_init(&newsk->sk_async_wait_queue);
1508 spin_lock_init(&newsk->sk_dst_lock);
1509 rwlock_init(&newsk->sk_callback_lock);
1510 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1511 af_callback_keys + newsk->sk_family,
1512 af_family_clock_key_strings[newsk->sk_family]);
1514 newsk->sk_dst_cache = NULL;
1515 newsk->sk_wmem_queued = 0;
1516 newsk->sk_forward_alloc = 0;
1517 newsk->sk_send_head = NULL;
1518 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1520 sock_reset_flag(newsk, SOCK_DONE);
1521 skb_queue_head_init(&newsk->sk_error_queue);
1523 filter = rcu_dereference_protected(newsk->sk_filter, 1);
1525 sk_filter_charge(newsk, filter);
1527 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1528 /* It is still raw copy of parent, so invalidate
1529 * destructor and make plain sk_free() */
1530 newsk->sk_destruct = NULL;
1531 bh_unlock_sock(newsk);
1538 newsk->sk_priority = 0;
1540 * Before updating sk_refcnt, we must commit prior changes to memory
1541 * (Documentation/RCU/rculist_nulls.txt for details)
1544 atomic_set(&newsk->sk_refcnt, 2);
1547 * Increment the counter in the same struct proto as the master
1548 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1549 * is the same as sk->sk_prot->socks, as this field was copied
1552 * This _changes_ the previous behaviour, where
1553 * tcp_create_openreq_child always was incrementing the
1554 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1555 * to be taken into account in all callers. -acme
1557 sk_refcnt_debug_inc(newsk);
1558 sk_set_socket(newsk, NULL);
1559 newsk->sk_wq = NULL;
1561 sk_update_clone(sk, newsk);
1563 if (newsk->sk_prot->sockets_allocated)
1564 sk_sockets_allocated_inc(newsk);
1566 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1567 net_enable_timestamp();
1572 EXPORT_SYMBOL_GPL(sk_clone_lock);
1574 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1576 __sk_dst_set(sk, dst);
1577 sk->sk_route_caps = dst->dev->features;
1578 if (sk->sk_route_caps & NETIF_F_GSO)
1579 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1580 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1581 if (sk_can_gso(sk)) {
1582 if (dst->header_len) {
1583 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1585 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1586 sk->sk_gso_max_size = dst->dev->gso_max_size;
1587 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
1591 EXPORT_SYMBOL_GPL(sk_setup_caps);
1594 * Simple resource managers for sockets.
1599 * Write buffer destructor automatically called from kfree_skb.
1601 void sock_wfree(struct sk_buff *skb)
1603 struct sock *sk = skb->sk;
1604 unsigned int len = skb->truesize;
1606 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1608 * Keep a reference on sk_wmem_alloc, this will be released
1609 * after sk_write_space() call
1611 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1612 sk->sk_write_space(sk);
1616 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1617 * could not do because of in-flight packets
1619 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
1622 EXPORT_SYMBOL(sock_wfree);
1624 void skb_orphan_partial(struct sk_buff *skb)
1626 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1627 * so we do not completely orphan skb, but transfert all
1628 * accounted bytes but one, to avoid unexpected reorders.
1630 if (skb->destructor == sock_wfree
1632 || skb->destructor == tcp_wfree
1635 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1641 EXPORT_SYMBOL(skb_orphan_partial);
1644 * Read buffer destructor automatically called from kfree_skb.
1646 void sock_rfree(struct sk_buff *skb)
1648 struct sock *sk = skb->sk;
1649 unsigned int len = skb->truesize;
1651 atomic_sub(len, &sk->sk_rmem_alloc);
1652 sk_mem_uncharge(sk, len);
1654 EXPORT_SYMBOL(sock_rfree);
1656 void sock_edemux(struct sk_buff *skb)
1658 struct sock *sk = skb->sk;
1661 if (sk->sk_state == TCP_TIME_WAIT)
1662 inet_twsk_put(inet_twsk(sk));
1667 EXPORT_SYMBOL(sock_edemux);
1669 kuid_t sock_i_uid(struct sock *sk)
1673 read_lock_bh(&sk->sk_callback_lock);
1674 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
1675 read_unlock_bh(&sk->sk_callback_lock);
1678 EXPORT_SYMBOL(sock_i_uid);
1680 unsigned long sock_i_ino(struct sock *sk)
1684 read_lock_bh(&sk->sk_callback_lock);
1685 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1686 read_unlock_bh(&sk->sk_callback_lock);
1689 EXPORT_SYMBOL(sock_i_ino);
1692 * Allocate a skb from the socket's send buffer.
1694 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1697 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1698 struct sk_buff *skb = alloc_skb(size, priority);
1700 skb_set_owner_w(skb, sk);
1706 EXPORT_SYMBOL(sock_wmalloc);
1709 * Allocate a memory block from the socket's option memory buffer.
1711 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1713 if ((unsigned int)size <= sysctl_optmem_max &&
1714 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1716 /* First do the add, to avoid the race if kmalloc
1719 atomic_add(size, &sk->sk_omem_alloc);
1720 mem = kmalloc(size, priority);
1723 atomic_sub(size, &sk->sk_omem_alloc);
1727 EXPORT_SYMBOL(sock_kmalloc);
1730 * Free an option memory block.
1732 void sock_kfree_s(struct sock *sk, void *mem, int size)
1735 atomic_sub(size, &sk->sk_omem_alloc);
1737 EXPORT_SYMBOL(sock_kfree_s);
1739 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1740 I think, these locks should be removed for datagram sockets.
1742 static long sock_wait_for_wmem(struct sock *sk, long timeo)
1746 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1750 if (signal_pending(current))
1752 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1753 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1754 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1756 if (sk->sk_shutdown & SEND_SHUTDOWN)
1760 timeo = schedule_timeout(timeo);
1762 finish_wait(sk_sleep(sk), &wait);
1768 * Generic send/receive buffer handlers
1771 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1772 unsigned long data_len, int noblock,
1773 int *errcode, int max_page_order)
1775 struct sk_buff *skb = NULL;
1776 unsigned long chunk;
1780 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1785 if (npages > MAX_SKB_FRAGS)
1788 timeo = sock_sndtimeo(sk, noblock);
1790 err = sock_error(sk);
1795 if (sk->sk_shutdown & SEND_SHUTDOWN)
1798 if (atomic_read(&sk->sk_wmem_alloc) >= sk->sk_sndbuf) {
1799 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1800 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1804 if (signal_pending(current))
1806 timeo = sock_wait_for_wmem(sk, timeo);
1811 gfp_mask = sk->sk_allocation;
1812 if (gfp_mask & __GFP_WAIT)
1813 gfp_mask |= __GFP_REPEAT;
1815 skb = alloc_skb(header_len, gfp_mask);
1819 skb->truesize += data_len;
1821 for (i = 0; npages > 0; i++) {
1822 int order = max_page_order;
1825 if (npages >= 1 << order) {
1826 page = alloc_pages(sk->sk_allocation |
1836 page = alloc_page(sk->sk_allocation);
1840 chunk = min_t(unsigned long, data_len,
1841 PAGE_SIZE << order);
1842 skb_fill_page_desc(skb, i, page, 0, chunk);
1844 npages -= 1 << order;
1848 skb_set_owner_w(skb, sk);
1852 err = sock_intr_errno(timeo);
1858 EXPORT_SYMBOL(sock_alloc_send_pskb);
1860 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1861 int noblock, int *errcode)
1863 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1865 EXPORT_SYMBOL(sock_alloc_send_skb);
1867 /* On 32bit arches, an skb frag is limited to 2^15 */
1868 #define SKB_FRAG_PAGE_ORDER get_order(32768)
1871 * skb_page_frag_refill - check that a page_frag contains enough room
1872 * @sz: minimum size of the fragment we want to get
1873 * @pfrag: pointer to page_frag
1874 * @prio: priority for memory allocation
1876 * Note: While this allocator tries to use high order pages, there is
1877 * no guarantee that allocations succeed. Therefore, @sz MUST be
1878 * less or equal than PAGE_SIZE.
1880 bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t prio)
1885 if (atomic_read(&pfrag->page->_count) == 1) {
1889 if (pfrag->offset + sz <= pfrag->size)
1891 put_page(pfrag->page);
1894 order = SKB_FRAG_PAGE_ORDER;
1899 gfp |= __GFP_COMP | __GFP_NOWARN | __GFP_NORETRY;
1900 pfrag->page = alloc_pages(gfp, order);
1901 if (likely(pfrag->page)) {
1903 pfrag->size = PAGE_SIZE << order;
1906 } while (--order >= 0);
1910 EXPORT_SYMBOL(skb_page_frag_refill);
1912 bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1914 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1917 sk_enter_memory_pressure(sk);
1918 sk_stream_moderate_sndbuf(sk);
1921 EXPORT_SYMBOL(sk_page_frag_refill);
1923 static void __lock_sock(struct sock *sk)
1924 __releases(&sk->sk_lock.slock)
1925 __acquires(&sk->sk_lock.slock)
1930 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1931 TASK_UNINTERRUPTIBLE);
1932 spin_unlock_bh(&sk->sk_lock.slock);
1934 spin_lock_bh(&sk->sk_lock.slock);
1935 if (!sock_owned_by_user(sk))
1938 finish_wait(&sk->sk_lock.wq, &wait);
1941 static void __release_sock(struct sock *sk)
1942 __releases(&sk->sk_lock.slock)
1943 __acquires(&sk->sk_lock.slock)
1945 struct sk_buff *skb = sk->sk_backlog.head;
1948 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1952 struct sk_buff *next = skb->next;
1955 WARN_ON_ONCE(skb_dst_is_noref(skb));
1957 sk_backlog_rcv(sk, skb);
1960 * We are in process context here with softirqs
1961 * disabled, use cond_resched_softirq() to preempt.
1962 * This is safe to do because we've taken the backlog
1965 cond_resched_softirq();
1968 } while (skb != NULL);
1971 } while ((skb = sk->sk_backlog.head) != NULL);
1974 * Doing the zeroing here guarantee we can not loop forever
1975 * while a wild producer attempts to flood us.
1977 sk->sk_backlog.len = 0;
1981 * sk_wait_data - wait for data to arrive at sk_receive_queue
1982 * @sk: sock to wait on
1983 * @timeo: for how long
1985 * Now socket state including sk->sk_err is changed only under lock,
1986 * hence we may omit checks after joining wait queue.
1987 * We check receive queue before schedule() only as optimization;
1988 * it is very likely that release_sock() added new data.
1990 int sk_wait_data(struct sock *sk, long *timeo)
1995 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1996 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1997 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1998 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1999 finish_wait(sk_sleep(sk), &wait);
2002 EXPORT_SYMBOL(sk_wait_data);
2005 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2007 * @size: memory size to allocate
2008 * @kind: allocation type
2010 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2011 * rmem allocation. This function assumes that protocols which have
2012 * memory_pressure use sk_wmem_queued as write buffer accounting.
2014 int __sk_mem_schedule(struct sock *sk, int size, int kind)
2016 struct proto *prot = sk->sk_prot;
2017 int amt = sk_mem_pages(size);
2019 int parent_status = UNDER_LIMIT;
2021 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
2023 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
2026 if (parent_status == UNDER_LIMIT &&
2027 allocated <= sk_prot_mem_limits(sk, 0)) {
2028 sk_leave_memory_pressure(sk);
2032 /* Under pressure. (we or our parents) */
2033 if ((parent_status > SOFT_LIMIT) ||
2034 allocated > sk_prot_mem_limits(sk, 1))
2035 sk_enter_memory_pressure(sk);
2037 /* Over hard limit (we or our parents) */
2038 if ((parent_status == OVER_LIMIT) ||
2039 (allocated > sk_prot_mem_limits(sk, 2)))
2040 goto suppress_allocation;
2042 /* guarantee minimum buffer size under pressure */
2043 if (kind == SK_MEM_RECV) {
2044 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2047 } else { /* SK_MEM_SEND */
2048 if (sk->sk_type == SOCK_STREAM) {
2049 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2051 } else if (atomic_read(&sk->sk_wmem_alloc) <
2052 prot->sysctl_wmem[0])
2056 if (sk_has_memory_pressure(sk)) {
2059 if (!sk_under_memory_pressure(sk))
2061 alloc = sk_sockets_allocated_read_positive(sk);
2062 if (sk_prot_mem_limits(sk, 2) > alloc *
2063 sk_mem_pages(sk->sk_wmem_queued +
2064 atomic_read(&sk->sk_rmem_alloc) +
2065 sk->sk_forward_alloc))
2069 suppress_allocation:
2071 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2072 sk_stream_moderate_sndbuf(sk);
2074 /* Fail only if socket is _under_ its sndbuf.
2075 * In this case we cannot block, so that we have to fail.
2077 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2081 trace_sock_exceed_buf_limit(sk, prot, allocated);
2083 /* Alas. Undo changes. */
2084 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
2086 sk_memory_allocated_sub(sk, amt);
2090 EXPORT_SYMBOL(__sk_mem_schedule);
2093 * __sk_reclaim - reclaim memory_allocated
2096 void __sk_mem_reclaim(struct sock *sk)
2098 sk_memory_allocated_sub(sk,
2099 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
2100 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
2102 if (sk_under_memory_pressure(sk) &&
2103 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2104 sk_leave_memory_pressure(sk);
2106 EXPORT_SYMBOL(__sk_mem_reclaim);
2110 * Set of default routines for initialising struct proto_ops when
2111 * the protocol does not support a particular function. In certain
2112 * cases where it makes no sense for a protocol to have a "do nothing"
2113 * function, some default processing is provided.
2116 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2120 EXPORT_SYMBOL(sock_no_bind);
2122 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
2127 EXPORT_SYMBOL(sock_no_connect);
2129 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2133 EXPORT_SYMBOL(sock_no_socketpair);
2135 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2139 EXPORT_SYMBOL(sock_no_accept);
2141 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
2146 EXPORT_SYMBOL(sock_no_getname);
2148 unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
2152 EXPORT_SYMBOL(sock_no_poll);
2154 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2158 EXPORT_SYMBOL(sock_no_ioctl);
2160 int sock_no_listen(struct socket *sock, int backlog)
2164 EXPORT_SYMBOL(sock_no_listen);
2166 int sock_no_shutdown(struct socket *sock, int how)
2170 EXPORT_SYMBOL(sock_no_shutdown);
2172 int sock_no_setsockopt(struct socket *sock, int level, int optname,
2173 char __user *optval, unsigned int optlen)
2177 EXPORT_SYMBOL(sock_no_setsockopt);
2179 int sock_no_getsockopt(struct socket *sock, int level, int optname,
2180 char __user *optval, int __user *optlen)
2184 EXPORT_SYMBOL(sock_no_getsockopt);
2186 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2191 EXPORT_SYMBOL(sock_no_sendmsg);
2193 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2194 size_t len, int flags)
2198 EXPORT_SYMBOL(sock_no_recvmsg);
2200 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2202 /* Mirror missing mmap method error code */
2205 EXPORT_SYMBOL(sock_no_mmap);
2207 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2210 struct msghdr msg = {.msg_flags = flags};
2212 char *kaddr = kmap(page);
2213 iov.iov_base = kaddr + offset;
2215 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2219 EXPORT_SYMBOL(sock_no_sendpage);
2222 * Default Socket Callbacks
2225 static void sock_def_wakeup(struct sock *sk)
2227 struct socket_wq *wq;
2230 wq = rcu_dereference(sk->sk_wq);
2231 if (wq_has_sleeper(wq))
2232 wake_up_interruptible_all(&wq->wait);
2236 static void sock_def_error_report(struct sock *sk)
2238 struct socket_wq *wq;
2241 wq = rcu_dereference(sk->sk_wq);
2242 if (wq_has_sleeper(wq))
2243 wake_up_interruptible_poll(&wq->wait, POLLERR);
2244 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2248 static void sock_def_readable(struct sock *sk)
2250 struct socket_wq *wq;
2253 wq = rcu_dereference(sk->sk_wq);
2254 if (wq_has_sleeper(wq))
2255 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
2256 POLLRDNORM | POLLRDBAND);
2257 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2261 static void sock_def_write_space(struct sock *sk)
2263 struct socket_wq *wq;
2267 /* Do not wake up a writer until he can make "significant"
2270 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
2271 wq = rcu_dereference(sk->sk_wq);
2272 if (wq_has_sleeper(wq))
2273 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
2274 POLLWRNORM | POLLWRBAND);
2276 /* Should agree with poll, otherwise some programs break */
2277 if (sock_writeable(sk))
2278 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2284 static void sock_def_destruct(struct sock *sk)
2286 kfree(sk->sk_protinfo);
2289 void sk_send_sigurg(struct sock *sk)
2291 if (sk->sk_socket && sk->sk_socket->file)
2292 if (send_sigurg(&sk->sk_socket->file->f_owner))
2293 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2295 EXPORT_SYMBOL(sk_send_sigurg);
2297 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2298 unsigned long expires)
2300 if (!mod_timer(timer, expires))
2303 EXPORT_SYMBOL(sk_reset_timer);
2305 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2307 if (del_timer(timer))
2310 EXPORT_SYMBOL(sk_stop_timer);
2312 void sock_init_data(struct socket *sock, struct sock *sk)
2314 skb_queue_head_init(&sk->sk_receive_queue);
2315 skb_queue_head_init(&sk->sk_write_queue);
2316 skb_queue_head_init(&sk->sk_error_queue);
2317 #ifdef CONFIG_NET_DMA
2318 skb_queue_head_init(&sk->sk_async_wait_queue);
2321 sk->sk_send_head = NULL;
2323 init_timer(&sk->sk_timer);
2325 sk->sk_allocation = GFP_KERNEL;
2326 sk->sk_rcvbuf = sysctl_rmem_default;
2327 sk->sk_sndbuf = sysctl_wmem_default;
2328 sk->sk_state = TCP_CLOSE;
2329 sk_set_socket(sk, sock);
2331 sock_set_flag(sk, SOCK_ZAPPED);
2334 sk->sk_type = sock->type;
2335 sk->sk_wq = sock->wq;
2340 spin_lock_init(&sk->sk_dst_lock);
2341 rwlock_init(&sk->sk_callback_lock);
2342 lockdep_set_class_and_name(&sk->sk_callback_lock,
2343 af_callback_keys + sk->sk_family,
2344 af_family_clock_key_strings[sk->sk_family]);
2346 sk->sk_state_change = sock_def_wakeup;
2347 sk->sk_data_ready = sock_def_readable;
2348 sk->sk_write_space = sock_def_write_space;
2349 sk->sk_error_report = sock_def_error_report;
2350 sk->sk_destruct = sock_def_destruct;
2352 sk->sk_frag.page = NULL;
2353 sk->sk_frag.offset = 0;
2354 sk->sk_peek_off = -1;
2356 sk->sk_peer_pid = NULL;
2357 sk->sk_peer_cred = NULL;
2358 sk->sk_write_pending = 0;
2359 sk->sk_rcvlowat = 1;
2360 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2361 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2363 sk->sk_stamp = ktime_set(-1L, 0);
2365 #ifdef CONFIG_NET_RX_BUSY_POLL
2367 sk->sk_ll_usec = sysctl_net_busy_read;
2370 sk->sk_max_pacing_rate = ~0U;
2371 sk->sk_pacing_rate = ~0U;
2373 * Before updating sk_refcnt, we must commit prior changes to memory
2374 * (Documentation/RCU/rculist_nulls.txt for details)
2377 atomic_set(&sk->sk_refcnt, 1);
2378 atomic_set(&sk->sk_drops, 0);
2380 EXPORT_SYMBOL(sock_init_data);
2382 void lock_sock_nested(struct sock *sk, int subclass)
2385 spin_lock_bh(&sk->sk_lock.slock);
2386 if (sk->sk_lock.owned)
2388 sk->sk_lock.owned = 1;
2389 spin_unlock(&sk->sk_lock.slock);
2391 * The sk_lock has mutex_lock() semantics here:
2393 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2396 EXPORT_SYMBOL(lock_sock_nested);
2398 void release_sock(struct sock *sk)
2401 * The sk_lock has mutex_unlock() semantics:
2403 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2405 spin_lock_bh(&sk->sk_lock.slock);
2406 if (sk->sk_backlog.tail)
2409 /* Warning : release_cb() might need to release sk ownership,
2410 * ie call sock_release_ownership(sk) before us.
2412 if (sk->sk_prot->release_cb)
2413 sk->sk_prot->release_cb(sk);
2415 sock_release_ownership(sk);
2416 if (waitqueue_active(&sk->sk_lock.wq))
2417 wake_up(&sk->sk_lock.wq);
2418 spin_unlock_bh(&sk->sk_lock.slock);
2420 EXPORT_SYMBOL(release_sock);
2423 * lock_sock_fast - fast version of lock_sock
2426 * This version should be used for very small section, where process wont block
2427 * return false if fast path is taken
2428 * sk_lock.slock locked, owned = 0, BH disabled
2429 * return true if slow path is taken
2430 * sk_lock.slock unlocked, owned = 1, BH enabled
2432 bool lock_sock_fast(struct sock *sk)
2435 spin_lock_bh(&sk->sk_lock.slock);
2437 if (!sk->sk_lock.owned)
2439 * Note : We must disable BH
2444 sk->sk_lock.owned = 1;
2445 spin_unlock(&sk->sk_lock.slock);
2447 * The sk_lock has mutex_lock() semantics here:
2449 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2453 EXPORT_SYMBOL(lock_sock_fast);
2455 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2458 if (!sock_flag(sk, SOCK_TIMESTAMP))
2459 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2460 tv = ktime_to_timeval(sk->sk_stamp);
2461 if (tv.tv_sec == -1)
2463 if (tv.tv_sec == 0) {
2464 sk->sk_stamp = ktime_get_real();
2465 tv = ktime_to_timeval(sk->sk_stamp);
2467 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
2469 EXPORT_SYMBOL(sock_get_timestamp);
2471 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2474 if (!sock_flag(sk, SOCK_TIMESTAMP))
2475 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2476 ts = ktime_to_timespec(sk->sk_stamp);
2477 if (ts.tv_sec == -1)
2479 if (ts.tv_sec == 0) {
2480 sk->sk_stamp = ktime_get_real();
2481 ts = ktime_to_timespec(sk->sk_stamp);
2483 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2485 EXPORT_SYMBOL(sock_get_timestampns);
2487 void sock_enable_timestamp(struct sock *sk, int flag)
2489 if (!sock_flag(sk, flag)) {
2490 unsigned long previous_flags = sk->sk_flags;
2492 sock_set_flag(sk, flag);
2494 * we just set one of the two flags which require net
2495 * time stamping, but time stamping might have been on
2496 * already because of the other one
2498 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
2499 net_enable_timestamp();
2503 int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2504 int level, int type)
2506 struct sock_exterr_skb *serr;
2507 struct sk_buff *skb, *skb2;
2511 skb = skb_dequeue(&sk->sk_error_queue);
2517 msg->msg_flags |= MSG_TRUNC;
2520 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2524 sock_recv_timestamp(msg, sk, skb);
2526 serr = SKB_EXT_ERR(skb);
2527 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2529 msg->msg_flags |= MSG_ERRQUEUE;
2532 /* Reset and regenerate socket error */
2533 spin_lock_bh(&sk->sk_error_queue.lock);
2535 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
2536 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
2537 spin_unlock_bh(&sk->sk_error_queue.lock);
2538 sk->sk_error_report(sk);
2540 spin_unlock_bh(&sk->sk_error_queue.lock);
2547 EXPORT_SYMBOL(sock_recv_errqueue);
2550 * Get a socket option on an socket.
2552 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2553 * asynchronous errors should be reported by getsockopt. We assume
2554 * this means if you specify SO_ERROR (otherwise whats the point of it).
2556 int sock_common_getsockopt(struct socket *sock, int level, int optname,
2557 char __user *optval, int __user *optlen)
2559 struct sock *sk = sock->sk;
2561 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2563 EXPORT_SYMBOL(sock_common_getsockopt);
2565 #ifdef CONFIG_COMPAT
2566 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2567 char __user *optval, int __user *optlen)
2569 struct sock *sk = sock->sk;
2571 if (sk->sk_prot->compat_getsockopt != NULL)
2572 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2574 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2576 EXPORT_SYMBOL(compat_sock_common_getsockopt);
2579 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2580 struct msghdr *msg, size_t size, int flags)
2582 struct sock *sk = sock->sk;
2586 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2587 flags & ~MSG_DONTWAIT, &addr_len);
2589 msg->msg_namelen = addr_len;
2592 EXPORT_SYMBOL(sock_common_recvmsg);
2595 * Set socket options on an inet socket.
2597 int sock_common_setsockopt(struct socket *sock, int level, int optname,
2598 char __user *optval, unsigned int optlen)
2600 struct sock *sk = sock->sk;
2602 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2604 EXPORT_SYMBOL(sock_common_setsockopt);
2606 #ifdef CONFIG_COMPAT
2607 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2608 char __user *optval, unsigned int optlen)
2610 struct sock *sk = sock->sk;
2612 if (sk->sk_prot->compat_setsockopt != NULL)
2613 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2615 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2617 EXPORT_SYMBOL(compat_sock_common_setsockopt);
2620 void sk_common_release(struct sock *sk)
2622 if (sk->sk_prot->destroy)
2623 sk->sk_prot->destroy(sk);
2626 * Observation: when sock_common_release is called, processes have
2627 * no access to socket. But net still has.
2628 * Step one, detach it from networking:
2630 * A. Remove from hash tables.
2633 sk->sk_prot->unhash(sk);
2636 * In this point socket cannot receive new packets, but it is possible
2637 * that some packets are in flight because some CPU runs receiver and
2638 * did hash table lookup before we unhashed socket. They will achieve
2639 * receive queue and will be purged by socket destructor.
2641 * Also we still have packets pending on receive queue and probably,
2642 * our own packets waiting in device queues. sock_destroy will drain
2643 * receive queue, but transmitted packets will delay socket destruction
2644 * until the last reference will be released.
2649 xfrm_sk_free_policy(sk);
2651 sk_refcnt_debug_release(sk);
2653 if (sk->sk_frag.page) {
2654 put_page(sk->sk_frag.page);
2655 sk->sk_frag.page = NULL;
2660 EXPORT_SYMBOL(sk_common_release);
2662 #ifdef CONFIG_PROC_FS
2663 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
2665 int val[PROTO_INUSE_NR];
2668 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2670 #ifdef CONFIG_NET_NS
2671 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2673 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
2675 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2677 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2679 int cpu, idx = prot->inuse_idx;
2682 for_each_possible_cpu(cpu)
2683 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2685 return res >= 0 ? res : 0;
2687 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2689 static int __net_init sock_inuse_init_net(struct net *net)
2691 net->core.inuse = alloc_percpu(struct prot_inuse);
2692 return net->core.inuse ? 0 : -ENOMEM;
2695 static void __net_exit sock_inuse_exit_net(struct net *net)
2697 free_percpu(net->core.inuse);
2700 static struct pernet_operations net_inuse_ops = {
2701 .init = sock_inuse_init_net,
2702 .exit = sock_inuse_exit_net,
2705 static __init int net_inuse_init(void)
2707 if (register_pernet_subsys(&net_inuse_ops))
2708 panic("Cannot initialize net inuse counters");
2713 core_initcall(net_inuse_init);
2715 static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2717 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2719 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
2721 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2723 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2725 int cpu, idx = prot->inuse_idx;
2728 for_each_possible_cpu(cpu)
2729 res += per_cpu(prot_inuse, cpu).val[idx];
2731 return res >= 0 ? res : 0;
2733 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2736 static void assign_proto_idx(struct proto *prot)
2738 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2740 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2741 pr_err("PROTO_INUSE_NR exhausted\n");
2745 set_bit(prot->inuse_idx, proto_inuse_idx);
2748 static void release_proto_idx(struct proto *prot)
2750 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2751 clear_bit(prot->inuse_idx, proto_inuse_idx);
2754 static inline void assign_proto_idx(struct proto *prot)
2758 static inline void release_proto_idx(struct proto *prot)
2763 int proto_register(struct proto *prot, int alloc_slab)
2766 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2767 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2770 if (prot->slab == NULL) {
2771 pr_crit("%s: Can't create sock SLAB cache!\n",
2776 if (prot->rsk_prot != NULL) {
2777 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
2778 if (prot->rsk_prot->slab_name == NULL)
2779 goto out_free_sock_slab;
2781 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2782 prot->rsk_prot->obj_size, 0,
2783 SLAB_HWCACHE_ALIGN, NULL);
2785 if (prot->rsk_prot->slab == NULL) {
2786 pr_crit("%s: Can't create request sock SLAB cache!\n",
2788 goto out_free_request_sock_slab_name;
2792 if (prot->twsk_prot != NULL) {
2793 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
2795 if (prot->twsk_prot->twsk_slab_name == NULL)
2796 goto out_free_request_sock_slab;
2798 prot->twsk_prot->twsk_slab =
2799 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2800 prot->twsk_prot->twsk_obj_size,
2802 SLAB_HWCACHE_ALIGN |
2805 if (prot->twsk_prot->twsk_slab == NULL)
2806 goto out_free_timewait_sock_slab_name;
2810 mutex_lock(&proto_list_mutex);
2811 list_add(&prot->node, &proto_list);
2812 assign_proto_idx(prot);
2813 mutex_unlock(&proto_list_mutex);
2816 out_free_timewait_sock_slab_name:
2817 kfree(prot->twsk_prot->twsk_slab_name);
2818 out_free_request_sock_slab:
2819 if (prot->rsk_prot && prot->rsk_prot->slab) {
2820 kmem_cache_destroy(prot->rsk_prot->slab);
2821 prot->rsk_prot->slab = NULL;
2823 out_free_request_sock_slab_name:
2825 kfree(prot->rsk_prot->slab_name);
2827 kmem_cache_destroy(prot->slab);
2832 EXPORT_SYMBOL(proto_register);
2834 void proto_unregister(struct proto *prot)
2836 mutex_lock(&proto_list_mutex);
2837 release_proto_idx(prot);
2838 list_del(&prot->node);
2839 mutex_unlock(&proto_list_mutex);
2841 if (prot->slab != NULL) {
2842 kmem_cache_destroy(prot->slab);
2846 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2847 kmem_cache_destroy(prot->rsk_prot->slab);
2848 kfree(prot->rsk_prot->slab_name);
2849 prot->rsk_prot->slab = NULL;
2852 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2853 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2854 kfree(prot->twsk_prot->twsk_slab_name);
2855 prot->twsk_prot->twsk_slab = NULL;
2858 EXPORT_SYMBOL(proto_unregister);
2860 #ifdef CONFIG_PROC_FS
2861 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2862 __acquires(proto_list_mutex)
2864 mutex_lock(&proto_list_mutex);
2865 return seq_list_start_head(&proto_list, *pos);
2868 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2870 return seq_list_next(v, &proto_list, pos);
2873 static void proto_seq_stop(struct seq_file *seq, void *v)
2874 __releases(proto_list_mutex)
2876 mutex_unlock(&proto_list_mutex);
2879 static char proto_method_implemented(const void *method)
2881 return method == NULL ? 'n' : 'y';
2883 static long sock_prot_memory_allocated(struct proto *proto)
2885 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
2888 static char *sock_prot_memory_pressure(struct proto *proto)
2890 return proto->memory_pressure != NULL ?
2891 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2894 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2897 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
2898 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2901 sock_prot_inuse_get(seq_file_net(seq), proto),
2902 sock_prot_memory_allocated(proto),
2903 sock_prot_memory_pressure(proto),
2905 proto->slab == NULL ? "no" : "yes",
2906 module_name(proto->owner),
2907 proto_method_implemented(proto->close),
2908 proto_method_implemented(proto->connect),
2909 proto_method_implemented(proto->disconnect),
2910 proto_method_implemented(proto->accept),
2911 proto_method_implemented(proto->ioctl),
2912 proto_method_implemented(proto->init),
2913 proto_method_implemented(proto->destroy),
2914 proto_method_implemented(proto->shutdown),
2915 proto_method_implemented(proto->setsockopt),
2916 proto_method_implemented(proto->getsockopt),
2917 proto_method_implemented(proto->sendmsg),
2918 proto_method_implemented(proto->recvmsg),
2919 proto_method_implemented(proto->sendpage),
2920 proto_method_implemented(proto->bind),
2921 proto_method_implemented(proto->backlog_rcv),
2922 proto_method_implemented(proto->hash),
2923 proto_method_implemented(proto->unhash),
2924 proto_method_implemented(proto->get_port),
2925 proto_method_implemented(proto->enter_memory_pressure));
2928 static int proto_seq_show(struct seq_file *seq, void *v)
2930 if (v == &proto_list)
2931 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2940 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2942 proto_seq_printf(seq, list_entry(v, struct proto, node));
2946 static const struct seq_operations proto_seq_ops = {
2947 .start = proto_seq_start,
2948 .next = proto_seq_next,
2949 .stop = proto_seq_stop,
2950 .show = proto_seq_show,
2953 static int proto_seq_open(struct inode *inode, struct file *file)
2955 return seq_open_net(inode, file, &proto_seq_ops,
2956 sizeof(struct seq_net_private));
2959 static const struct file_operations proto_seq_fops = {
2960 .owner = THIS_MODULE,
2961 .open = proto_seq_open,
2963 .llseek = seq_lseek,
2964 .release = seq_release_net,
2967 static __net_init int proto_init_net(struct net *net)
2969 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
2975 static __net_exit void proto_exit_net(struct net *net)
2977 remove_proc_entry("protocols", net->proc_net);
2981 static __net_initdata struct pernet_operations proto_net_ops = {
2982 .init = proto_init_net,
2983 .exit = proto_exit_net,
2986 static int __init proto_init(void)
2988 return register_pernet_subsys(&proto_net_ops);
2991 subsys_initcall(proto_init);
2993 #endif /* PROC_FS */