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, 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_RAW_HARDWARE,
866 val & SOF_TIMESTAMPING_RAW_HARDWARE);
872 sk->sk_rcvlowat = val ? : 1;
876 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
880 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
883 case SO_ATTACH_FILTER:
885 if (optlen == sizeof(struct sock_fprog)) {
886 struct sock_fprog fprog;
889 if (copy_from_user(&fprog, optval, sizeof(fprog)))
892 ret = sk_attach_filter(&fprog, sk);
896 case SO_DETACH_FILTER:
897 ret = sk_detach_filter(sk);
901 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
904 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
909 set_bit(SOCK_PASSSEC, &sock->flags);
911 clear_bit(SOCK_PASSSEC, &sock->flags);
914 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
920 /* We implement the SO_SNDLOWAT etc to
921 not be settable (1003.1g 5.3) */
923 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
927 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
931 if (sock->ops->set_peek_off)
932 ret = sock->ops->set_peek_off(sk, val);
938 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
941 case SO_SELECT_ERR_QUEUE:
942 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
945 #ifdef CONFIG_NET_RX_BUSY_POLL
947 /* allow unprivileged users to decrease the value */
948 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
954 sk->sk_ll_usec = val;
959 case SO_MAX_PACING_RATE:
960 sk->sk_max_pacing_rate = val;
961 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
962 sk->sk_max_pacing_rate);
972 EXPORT_SYMBOL(sock_setsockopt);
975 static void cred_to_ucred(struct pid *pid, const struct cred *cred,
978 ucred->pid = pid_vnr(pid);
979 ucred->uid = ucred->gid = -1;
981 struct user_namespace *current_ns = current_user_ns();
983 ucred->uid = from_kuid_munged(current_ns, cred->euid);
984 ucred->gid = from_kgid_munged(current_ns, cred->egid);
988 int sock_getsockopt(struct socket *sock, int level, int optname,
989 char __user *optval, int __user *optlen)
991 struct sock *sk = sock->sk;
999 int lv = sizeof(int);
1002 if (get_user(len, optlen))
1007 memset(&v, 0, sizeof(v));
1011 v.val = sock_flag(sk, SOCK_DBG);
1015 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1019 v.val = sock_flag(sk, SOCK_BROADCAST);
1023 v.val = sk->sk_sndbuf;
1027 v.val = sk->sk_rcvbuf;
1031 v.val = sk->sk_reuse;
1035 v.val = sk->sk_reuseport;
1039 v.val = sock_flag(sk, SOCK_KEEPOPEN);
1043 v.val = sk->sk_type;
1047 v.val = sk->sk_protocol;
1051 v.val = sk->sk_family;
1055 v.val = -sock_error(sk);
1057 v.val = xchg(&sk->sk_err_soft, 0);
1061 v.val = sock_flag(sk, SOCK_URGINLINE);
1065 v.val = sk->sk_no_check_tx;
1069 v.val = sk->sk_priority;
1073 lv = sizeof(v.ling);
1074 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
1075 v.ling.l_linger = sk->sk_lingertime / HZ;
1079 sock_warn_obsolete_bsdism("getsockopt");
1083 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1084 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1087 case SO_TIMESTAMPNS:
1088 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
1091 case SO_TIMESTAMPING:
1093 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
1094 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
1095 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
1096 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
1097 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
1098 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
1099 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1100 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
1101 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
1102 v.val |= SOF_TIMESTAMPING_SOFTWARE;
1103 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
1104 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
1108 lv = sizeof(struct timeval);
1109 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1113 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1114 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1119 lv = sizeof(struct timeval);
1120 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1124 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1125 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1130 v.val = sk->sk_rcvlowat;
1138 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1143 struct ucred peercred;
1144 if (len > sizeof(peercred))
1145 len = sizeof(peercred);
1146 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1147 if (copy_to_user(optval, &peercred, len))
1156 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1160 if (copy_to_user(optval, address, len))
1165 /* Dubious BSD thing... Probably nobody even uses it, but
1166 * the UNIX standard wants it for whatever reason... -DaveM
1169 v.val = sk->sk_state == TCP_LISTEN;
1173 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1177 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1180 v.val = sk->sk_mark;
1184 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1187 case SO_WIFI_STATUS:
1188 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1192 if (!sock->ops->set_peek_off)
1195 v.val = sk->sk_peek_off;
1198 v.val = sock_flag(sk, SOCK_NOFCS);
1201 case SO_BINDTODEVICE:
1202 return sock_getbindtodevice(sk, optval, optlen, len);
1205 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1211 case SO_LOCK_FILTER:
1212 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1215 case SO_BPF_EXTENSIONS:
1216 v.val = bpf_tell_extensions();
1219 case SO_SELECT_ERR_QUEUE:
1220 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1223 #ifdef CONFIG_NET_RX_BUSY_POLL
1225 v.val = sk->sk_ll_usec;
1229 case SO_MAX_PACING_RATE:
1230 v.val = sk->sk_max_pacing_rate;
1234 return -ENOPROTOOPT;
1239 if (copy_to_user(optval, &v, len))
1242 if (put_user(len, optlen))
1248 * Initialize an sk_lock.
1250 * (We also register the sk_lock with the lock validator.)
1252 static inline void sock_lock_init(struct sock *sk)
1254 sock_lock_init_class_and_name(sk,
1255 af_family_slock_key_strings[sk->sk_family],
1256 af_family_slock_keys + sk->sk_family,
1257 af_family_key_strings[sk->sk_family],
1258 af_family_keys + sk->sk_family);
1262 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1263 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1264 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1266 static void sock_copy(struct sock *nsk, const struct sock *osk)
1268 #ifdef CONFIG_SECURITY_NETWORK
1269 void *sptr = nsk->sk_security;
1271 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1273 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1274 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1276 #ifdef CONFIG_SECURITY_NETWORK
1277 nsk->sk_security = sptr;
1278 security_sk_clone(osk, nsk);
1282 void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1284 unsigned long nulls1, nulls2;
1286 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1287 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1288 if (nulls1 > nulls2)
1289 swap(nulls1, nulls2);
1292 memset((char *)sk, 0, nulls1);
1293 memset((char *)sk + nulls1 + sizeof(void *), 0,
1294 nulls2 - nulls1 - sizeof(void *));
1295 memset((char *)sk + nulls2 + sizeof(void *), 0,
1296 size - nulls2 - sizeof(void *));
1298 EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1300 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1304 struct kmem_cache *slab;
1308 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1311 if (priority & __GFP_ZERO) {
1313 prot->clear_sk(sk, prot->obj_size);
1315 sk_prot_clear_nulls(sk, prot->obj_size);
1318 sk = kmalloc(prot->obj_size, priority);
1321 kmemcheck_annotate_bitfield(sk, flags);
1323 if (security_sk_alloc(sk, family, priority))
1326 if (!try_module_get(prot->owner))
1328 sk_tx_queue_clear(sk);
1334 security_sk_free(sk);
1337 kmem_cache_free(slab, sk);
1343 static void sk_prot_free(struct proto *prot, struct sock *sk)
1345 struct kmem_cache *slab;
1346 struct module *owner;
1348 owner = prot->owner;
1351 security_sk_free(sk);
1353 kmem_cache_free(slab, sk);
1359 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
1360 void sock_update_netprioidx(struct sock *sk)
1365 sk->sk_cgrp_prioidx = task_netprioidx(current);
1367 EXPORT_SYMBOL_GPL(sock_update_netprioidx);
1371 * sk_alloc - All socket objects are allocated here
1372 * @net: the applicable net namespace
1373 * @family: protocol family
1374 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1375 * @prot: struct proto associated with this new sock instance
1377 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1382 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1384 sk->sk_family = family;
1386 * See comment in struct sock definition to understand
1387 * why we need sk_prot_creator -acme
1389 sk->sk_prot = sk->sk_prot_creator = prot;
1391 sock_net_set(sk, get_net(net));
1392 atomic_set(&sk->sk_wmem_alloc, 1);
1394 sock_update_classid(sk);
1395 sock_update_netprioidx(sk);
1400 EXPORT_SYMBOL(sk_alloc);
1402 static void __sk_free(struct sock *sk)
1404 struct sk_filter *filter;
1406 if (sk->sk_destruct)
1407 sk->sk_destruct(sk);
1409 filter = rcu_dereference_check(sk->sk_filter,
1410 atomic_read(&sk->sk_wmem_alloc) == 0);
1412 sk_filter_uncharge(sk, filter);
1413 RCU_INIT_POINTER(sk->sk_filter, NULL);
1416 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1418 if (atomic_read(&sk->sk_omem_alloc))
1419 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1420 __func__, atomic_read(&sk->sk_omem_alloc));
1422 if (sk->sk_peer_cred)
1423 put_cred(sk->sk_peer_cred);
1424 put_pid(sk->sk_peer_pid);
1425 put_net(sock_net(sk));
1426 sk_prot_free(sk->sk_prot_creator, sk);
1429 void sk_free(struct sock *sk)
1432 * We subtract one from sk_wmem_alloc and can know if
1433 * some packets are still in some tx queue.
1434 * If not null, sock_wfree() will call __sk_free(sk) later
1436 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1439 EXPORT_SYMBOL(sk_free);
1442 * Last sock_put should drop reference to sk->sk_net. It has already
1443 * been dropped in sk_change_net. Taking reference to stopping namespace
1445 * Take reference to a socket to remove it from hash _alive_ and after that
1446 * destroy it in the context of init_net.
1448 void sk_release_kernel(struct sock *sk)
1450 if (sk == NULL || sk->sk_socket == NULL)
1454 sock_release(sk->sk_socket);
1455 release_net(sock_net(sk));
1456 sock_net_set(sk, get_net(&init_net));
1459 EXPORT_SYMBOL(sk_release_kernel);
1461 static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1463 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1464 sock_update_memcg(newsk);
1468 * sk_clone_lock - clone a socket, and lock its clone
1469 * @sk: the socket to clone
1470 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1472 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1474 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1478 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1479 if (newsk != NULL) {
1480 struct sk_filter *filter;
1482 sock_copy(newsk, sk);
1485 get_net(sock_net(newsk));
1486 sk_node_init(&newsk->sk_node);
1487 sock_lock_init(newsk);
1488 bh_lock_sock(newsk);
1489 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1490 newsk->sk_backlog.len = 0;
1492 atomic_set(&newsk->sk_rmem_alloc, 0);
1494 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1496 atomic_set(&newsk->sk_wmem_alloc, 1);
1497 atomic_set(&newsk->sk_omem_alloc, 0);
1498 skb_queue_head_init(&newsk->sk_receive_queue);
1499 skb_queue_head_init(&newsk->sk_write_queue);
1500 #ifdef CONFIG_NET_DMA
1501 skb_queue_head_init(&newsk->sk_async_wait_queue);
1504 spin_lock_init(&newsk->sk_dst_lock);
1505 rwlock_init(&newsk->sk_callback_lock);
1506 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1507 af_callback_keys + newsk->sk_family,
1508 af_family_clock_key_strings[newsk->sk_family]);
1510 newsk->sk_dst_cache = NULL;
1511 newsk->sk_wmem_queued = 0;
1512 newsk->sk_forward_alloc = 0;
1513 newsk->sk_send_head = NULL;
1514 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1516 sock_reset_flag(newsk, SOCK_DONE);
1517 skb_queue_head_init(&newsk->sk_error_queue);
1519 filter = rcu_dereference_protected(newsk->sk_filter, 1);
1521 sk_filter_charge(newsk, filter);
1523 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1524 /* It is still raw copy of parent, so invalidate
1525 * destructor and make plain sk_free() */
1526 newsk->sk_destruct = NULL;
1527 bh_unlock_sock(newsk);
1534 newsk->sk_priority = 0;
1536 * Before updating sk_refcnt, we must commit prior changes to memory
1537 * (Documentation/RCU/rculist_nulls.txt for details)
1540 atomic_set(&newsk->sk_refcnt, 2);
1543 * Increment the counter in the same struct proto as the master
1544 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1545 * is the same as sk->sk_prot->socks, as this field was copied
1548 * This _changes_ the previous behaviour, where
1549 * tcp_create_openreq_child always was incrementing the
1550 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1551 * to be taken into account in all callers. -acme
1553 sk_refcnt_debug_inc(newsk);
1554 sk_set_socket(newsk, NULL);
1555 newsk->sk_wq = NULL;
1557 sk_update_clone(sk, newsk);
1559 if (newsk->sk_prot->sockets_allocated)
1560 sk_sockets_allocated_inc(newsk);
1562 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1563 net_enable_timestamp();
1568 EXPORT_SYMBOL_GPL(sk_clone_lock);
1570 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1572 __sk_dst_set(sk, dst);
1573 sk->sk_route_caps = dst->dev->features;
1574 if (sk->sk_route_caps & NETIF_F_GSO)
1575 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1576 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1577 if (sk_can_gso(sk)) {
1578 if (dst->header_len) {
1579 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1581 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1582 sk->sk_gso_max_size = dst->dev->gso_max_size;
1583 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
1587 EXPORT_SYMBOL_GPL(sk_setup_caps);
1590 * Simple resource managers for sockets.
1595 * Write buffer destructor automatically called from kfree_skb.
1597 void sock_wfree(struct sk_buff *skb)
1599 struct sock *sk = skb->sk;
1600 unsigned int len = skb->truesize;
1602 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1604 * Keep a reference on sk_wmem_alloc, this will be released
1605 * after sk_write_space() call
1607 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1608 sk->sk_write_space(sk);
1612 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1613 * could not do because of in-flight packets
1615 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
1618 EXPORT_SYMBOL(sock_wfree);
1620 void skb_orphan_partial(struct sk_buff *skb)
1622 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1623 * so we do not completely orphan skb, but transfert all
1624 * accounted bytes but one, to avoid unexpected reorders.
1626 if (skb->destructor == sock_wfree
1628 || skb->destructor == tcp_wfree
1631 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1637 EXPORT_SYMBOL(skb_orphan_partial);
1640 * Read buffer destructor automatically called from kfree_skb.
1642 void sock_rfree(struct sk_buff *skb)
1644 struct sock *sk = skb->sk;
1645 unsigned int len = skb->truesize;
1647 atomic_sub(len, &sk->sk_rmem_alloc);
1648 sk_mem_uncharge(sk, len);
1650 EXPORT_SYMBOL(sock_rfree);
1652 void sock_edemux(struct sk_buff *skb)
1654 struct sock *sk = skb->sk;
1657 if (sk->sk_state == TCP_TIME_WAIT)
1658 inet_twsk_put(inet_twsk(sk));
1663 EXPORT_SYMBOL(sock_edemux);
1665 kuid_t sock_i_uid(struct sock *sk)
1669 read_lock_bh(&sk->sk_callback_lock);
1670 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
1671 read_unlock_bh(&sk->sk_callback_lock);
1674 EXPORT_SYMBOL(sock_i_uid);
1676 unsigned long sock_i_ino(struct sock *sk)
1680 read_lock_bh(&sk->sk_callback_lock);
1681 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1682 read_unlock_bh(&sk->sk_callback_lock);
1685 EXPORT_SYMBOL(sock_i_ino);
1688 * Allocate a skb from the socket's send buffer.
1690 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1693 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1694 struct sk_buff *skb = alloc_skb(size, priority);
1696 skb_set_owner_w(skb, sk);
1702 EXPORT_SYMBOL(sock_wmalloc);
1705 * Allocate a memory block from the socket's option memory buffer.
1707 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1709 if ((unsigned int)size <= sysctl_optmem_max &&
1710 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1712 /* First do the add, to avoid the race if kmalloc
1715 atomic_add(size, &sk->sk_omem_alloc);
1716 mem = kmalloc(size, priority);
1719 atomic_sub(size, &sk->sk_omem_alloc);
1723 EXPORT_SYMBOL(sock_kmalloc);
1726 * Free an option memory block.
1728 void sock_kfree_s(struct sock *sk, void *mem, int size)
1731 atomic_sub(size, &sk->sk_omem_alloc);
1733 EXPORT_SYMBOL(sock_kfree_s);
1735 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1736 I think, these locks should be removed for datagram sockets.
1738 static long sock_wait_for_wmem(struct sock *sk, long timeo)
1742 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1746 if (signal_pending(current))
1748 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1749 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1750 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1752 if (sk->sk_shutdown & SEND_SHUTDOWN)
1756 timeo = schedule_timeout(timeo);
1758 finish_wait(sk_sleep(sk), &wait);
1764 * Generic send/receive buffer handlers
1767 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1768 unsigned long data_len, int noblock,
1769 int *errcode, int max_page_order)
1771 struct sk_buff *skb = NULL;
1772 unsigned long chunk;
1776 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1781 if (npages > MAX_SKB_FRAGS)
1784 timeo = sock_sndtimeo(sk, noblock);
1786 err = sock_error(sk);
1791 if (sk->sk_shutdown & SEND_SHUTDOWN)
1794 if (atomic_read(&sk->sk_wmem_alloc) >= sk->sk_sndbuf) {
1795 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1796 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1800 if (signal_pending(current))
1802 timeo = sock_wait_for_wmem(sk, timeo);
1807 gfp_mask = sk->sk_allocation;
1808 if (gfp_mask & __GFP_WAIT)
1809 gfp_mask |= __GFP_REPEAT;
1811 skb = alloc_skb(header_len, gfp_mask);
1815 skb->truesize += data_len;
1817 for (i = 0; npages > 0; i++) {
1818 int order = max_page_order;
1821 if (npages >= 1 << order) {
1822 page = alloc_pages(sk->sk_allocation |
1832 page = alloc_page(sk->sk_allocation);
1836 chunk = min_t(unsigned long, data_len,
1837 PAGE_SIZE << order);
1838 skb_fill_page_desc(skb, i, page, 0, chunk);
1840 npages -= 1 << order;
1844 skb_set_owner_w(skb, sk);
1848 err = sock_intr_errno(timeo);
1854 EXPORT_SYMBOL(sock_alloc_send_pskb);
1856 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1857 int noblock, int *errcode)
1859 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1861 EXPORT_SYMBOL(sock_alloc_send_skb);
1863 /* On 32bit arches, an skb frag is limited to 2^15 */
1864 #define SKB_FRAG_PAGE_ORDER get_order(32768)
1867 * skb_page_frag_refill - check that a page_frag contains enough room
1868 * @sz: minimum size of the fragment we want to get
1869 * @pfrag: pointer to page_frag
1870 * @prio: priority for memory allocation
1872 * Note: While this allocator tries to use high order pages, there is
1873 * no guarantee that allocations succeed. Therefore, @sz MUST be
1874 * less or equal than PAGE_SIZE.
1876 bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t prio)
1881 if (atomic_read(&pfrag->page->_count) == 1) {
1885 if (pfrag->offset + sz <= pfrag->size)
1887 put_page(pfrag->page);
1890 order = SKB_FRAG_PAGE_ORDER;
1895 gfp |= __GFP_COMP | __GFP_NOWARN | __GFP_NORETRY;
1896 pfrag->page = alloc_pages(gfp, order);
1897 if (likely(pfrag->page)) {
1899 pfrag->size = PAGE_SIZE << order;
1902 } while (--order >= 0);
1906 EXPORT_SYMBOL(skb_page_frag_refill);
1908 bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1910 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1913 sk_enter_memory_pressure(sk);
1914 sk_stream_moderate_sndbuf(sk);
1917 EXPORT_SYMBOL(sk_page_frag_refill);
1919 static void __lock_sock(struct sock *sk)
1920 __releases(&sk->sk_lock.slock)
1921 __acquires(&sk->sk_lock.slock)
1926 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1927 TASK_UNINTERRUPTIBLE);
1928 spin_unlock_bh(&sk->sk_lock.slock);
1930 spin_lock_bh(&sk->sk_lock.slock);
1931 if (!sock_owned_by_user(sk))
1934 finish_wait(&sk->sk_lock.wq, &wait);
1937 static void __release_sock(struct sock *sk)
1938 __releases(&sk->sk_lock.slock)
1939 __acquires(&sk->sk_lock.slock)
1941 struct sk_buff *skb = sk->sk_backlog.head;
1944 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1948 struct sk_buff *next = skb->next;
1951 WARN_ON_ONCE(skb_dst_is_noref(skb));
1953 sk_backlog_rcv(sk, skb);
1956 * We are in process context here with softirqs
1957 * disabled, use cond_resched_softirq() to preempt.
1958 * This is safe to do because we've taken the backlog
1961 cond_resched_softirq();
1964 } while (skb != NULL);
1967 } while ((skb = sk->sk_backlog.head) != NULL);
1970 * Doing the zeroing here guarantee we can not loop forever
1971 * while a wild producer attempts to flood us.
1973 sk->sk_backlog.len = 0;
1977 * sk_wait_data - wait for data to arrive at sk_receive_queue
1978 * @sk: sock to wait on
1979 * @timeo: for how long
1981 * Now socket state including sk->sk_err is changed only under lock,
1982 * hence we may omit checks after joining wait queue.
1983 * We check receive queue before schedule() only as optimization;
1984 * it is very likely that release_sock() added new data.
1986 int sk_wait_data(struct sock *sk, long *timeo)
1991 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1992 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1993 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1994 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1995 finish_wait(sk_sleep(sk), &wait);
1998 EXPORT_SYMBOL(sk_wait_data);
2001 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2003 * @size: memory size to allocate
2004 * @kind: allocation type
2006 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2007 * rmem allocation. This function assumes that protocols which have
2008 * memory_pressure use sk_wmem_queued as write buffer accounting.
2010 int __sk_mem_schedule(struct sock *sk, int size, int kind)
2012 struct proto *prot = sk->sk_prot;
2013 int amt = sk_mem_pages(size);
2015 int parent_status = UNDER_LIMIT;
2017 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
2019 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
2022 if (parent_status == UNDER_LIMIT &&
2023 allocated <= sk_prot_mem_limits(sk, 0)) {
2024 sk_leave_memory_pressure(sk);
2028 /* Under pressure. (we or our parents) */
2029 if ((parent_status > SOFT_LIMIT) ||
2030 allocated > sk_prot_mem_limits(sk, 1))
2031 sk_enter_memory_pressure(sk);
2033 /* Over hard limit (we or our parents) */
2034 if ((parent_status == OVER_LIMIT) ||
2035 (allocated > sk_prot_mem_limits(sk, 2)))
2036 goto suppress_allocation;
2038 /* guarantee minimum buffer size under pressure */
2039 if (kind == SK_MEM_RECV) {
2040 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2043 } else { /* SK_MEM_SEND */
2044 if (sk->sk_type == SOCK_STREAM) {
2045 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2047 } else if (atomic_read(&sk->sk_wmem_alloc) <
2048 prot->sysctl_wmem[0])
2052 if (sk_has_memory_pressure(sk)) {
2055 if (!sk_under_memory_pressure(sk))
2057 alloc = sk_sockets_allocated_read_positive(sk);
2058 if (sk_prot_mem_limits(sk, 2) > alloc *
2059 sk_mem_pages(sk->sk_wmem_queued +
2060 atomic_read(&sk->sk_rmem_alloc) +
2061 sk->sk_forward_alloc))
2065 suppress_allocation:
2067 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2068 sk_stream_moderate_sndbuf(sk);
2070 /* Fail only if socket is _under_ its sndbuf.
2071 * In this case we cannot block, so that we have to fail.
2073 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2077 trace_sock_exceed_buf_limit(sk, prot, allocated);
2079 /* Alas. Undo changes. */
2080 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
2082 sk_memory_allocated_sub(sk, amt);
2086 EXPORT_SYMBOL(__sk_mem_schedule);
2089 * __sk_reclaim - reclaim memory_allocated
2092 void __sk_mem_reclaim(struct sock *sk)
2094 sk_memory_allocated_sub(sk,
2095 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
2096 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
2098 if (sk_under_memory_pressure(sk) &&
2099 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2100 sk_leave_memory_pressure(sk);
2102 EXPORT_SYMBOL(__sk_mem_reclaim);
2106 * Set of default routines for initialising struct proto_ops when
2107 * the protocol does not support a particular function. In certain
2108 * cases where it makes no sense for a protocol to have a "do nothing"
2109 * function, some default processing is provided.
2112 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2116 EXPORT_SYMBOL(sock_no_bind);
2118 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
2123 EXPORT_SYMBOL(sock_no_connect);
2125 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2129 EXPORT_SYMBOL(sock_no_socketpair);
2131 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2135 EXPORT_SYMBOL(sock_no_accept);
2137 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
2142 EXPORT_SYMBOL(sock_no_getname);
2144 unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
2148 EXPORT_SYMBOL(sock_no_poll);
2150 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2154 EXPORT_SYMBOL(sock_no_ioctl);
2156 int sock_no_listen(struct socket *sock, int backlog)
2160 EXPORT_SYMBOL(sock_no_listen);
2162 int sock_no_shutdown(struct socket *sock, int how)
2166 EXPORT_SYMBOL(sock_no_shutdown);
2168 int sock_no_setsockopt(struct socket *sock, int level, int optname,
2169 char __user *optval, unsigned int optlen)
2173 EXPORT_SYMBOL(sock_no_setsockopt);
2175 int sock_no_getsockopt(struct socket *sock, int level, int optname,
2176 char __user *optval, int __user *optlen)
2180 EXPORT_SYMBOL(sock_no_getsockopt);
2182 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2187 EXPORT_SYMBOL(sock_no_sendmsg);
2189 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2190 size_t len, int flags)
2194 EXPORT_SYMBOL(sock_no_recvmsg);
2196 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2198 /* Mirror missing mmap method error code */
2201 EXPORT_SYMBOL(sock_no_mmap);
2203 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2206 struct msghdr msg = {.msg_flags = flags};
2208 char *kaddr = kmap(page);
2209 iov.iov_base = kaddr + offset;
2211 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2215 EXPORT_SYMBOL(sock_no_sendpage);
2218 * Default Socket Callbacks
2221 static void sock_def_wakeup(struct sock *sk)
2223 struct socket_wq *wq;
2226 wq = rcu_dereference(sk->sk_wq);
2227 if (wq_has_sleeper(wq))
2228 wake_up_interruptible_all(&wq->wait);
2232 static void sock_def_error_report(struct sock *sk)
2234 struct socket_wq *wq;
2237 wq = rcu_dereference(sk->sk_wq);
2238 if (wq_has_sleeper(wq))
2239 wake_up_interruptible_poll(&wq->wait, POLLERR);
2240 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2244 static void sock_def_readable(struct sock *sk)
2246 struct socket_wq *wq;
2249 wq = rcu_dereference(sk->sk_wq);
2250 if (wq_has_sleeper(wq))
2251 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
2252 POLLRDNORM | POLLRDBAND);
2253 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2257 static void sock_def_write_space(struct sock *sk)
2259 struct socket_wq *wq;
2263 /* Do not wake up a writer until he can make "significant"
2266 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
2267 wq = rcu_dereference(sk->sk_wq);
2268 if (wq_has_sleeper(wq))
2269 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
2270 POLLWRNORM | POLLWRBAND);
2272 /* Should agree with poll, otherwise some programs break */
2273 if (sock_writeable(sk))
2274 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2280 static void sock_def_destruct(struct sock *sk)
2282 kfree(sk->sk_protinfo);
2285 void sk_send_sigurg(struct sock *sk)
2287 if (sk->sk_socket && sk->sk_socket->file)
2288 if (send_sigurg(&sk->sk_socket->file->f_owner))
2289 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2291 EXPORT_SYMBOL(sk_send_sigurg);
2293 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2294 unsigned long expires)
2296 if (!mod_timer(timer, expires))
2299 EXPORT_SYMBOL(sk_reset_timer);
2301 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2303 if (del_timer(timer))
2306 EXPORT_SYMBOL(sk_stop_timer);
2308 void sock_init_data(struct socket *sock, struct sock *sk)
2310 skb_queue_head_init(&sk->sk_receive_queue);
2311 skb_queue_head_init(&sk->sk_write_queue);
2312 skb_queue_head_init(&sk->sk_error_queue);
2313 #ifdef CONFIG_NET_DMA
2314 skb_queue_head_init(&sk->sk_async_wait_queue);
2317 sk->sk_send_head = NULL;
2319 init_timer(&sk->sk_timer);
2321 sk->sk_allocation = GFP_KERNEL;
2322 sk->sk_rcvbuf = sysctl_rmem_default;
2323 sk->sk_sndbuf = sysctl_wmem_default;
2324 sk->sk_state = TCP_CLOSE;
2325 sk_set_socket(sk, sock);
2327 sock_set_flag(sk, SOCK_ZAPPED);
2330 sk->sk_type = sock->type;
2331 sk->sk_wq = sock->wq;
2336 spin_lock_init(&sk->sk_dst_lock);
2337 rwlock_init(&sk->sk_callback_lock);
2338 lockdep_set_class_and_name(&sk->sk_callback_lock,
2339 af_callback_keys + sk->sk_family,
2340 af_family_clock_key_strings[sk->sk_family]);
2342 sk->sk_state_change = sock_def_wakeup;
2343 sk->sk_data_ready = sock_def_readable;
2344 sk->sk_write_space = sock_def_write_space;
2345 sk->sk_error_report = sock_def_error_report;
2346 sk->sk_destruct = sock_def_destruct;
2348 sk->sk_frag.page = NULL;
2349 sk->sk_frag.offset = 0;
2350 sk->sk_peek_off = -1;
2352 sk->sk_peer_pid = NULL;
2353 sk->sk_peer_cred = NULL;
2354 sk->sk_write_pending = 0;
2355 sk->sk_rcvlowat = 1;
2356 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2357 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2359 sk->sk_stamp = ktime_set(-1L, 0);
2361 #ifdef CONFIG_NET_RX_BUSY_POLL
2363 sk->sk_ll_usec = sysctl_net_busy_read;
2366 sk->sk_max_pacing_rate = ~0U;
2367 sk->sk_pacing_rate = ~0U;
2369 * Before updating sk_refcnt, we must commit prior changes to memory
2370 * (Documentation/RCU/rculist_nulls.txt for details)
2373 atomic_set(&sk->sk_refcnt, 1);
2374 atomic_set(&sk->sk_drops, 0);
2376 EXPORT_SYMBOL(sock_init_data);
2378 void lock_sock_nested(struct sock *sk, int subclass)
2381 spin_lock_bh(&sk->sk_lock.slock);
2382 if (sk->sk_lock.owned)
2384 sk->sk_lock.owned = 1;
2385 spin_unlock(&sk->sk_lock.slock);
2387 * The sk_lock has mutex_lock() semantics here:
2389 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2392 EXPORT_SYMBOL(lock_sock_nested);
2394 void release_sock(struct sock *sk)
2397 * The sk_lock has mutex_unlock() semantics:
2399 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2401 spin_lock_bh(&sk->sk_lock.slock);
2402 if (sk->sk_backlog.tail)
2405 /* Warning : release_cb() might need to release sk ownership,
2406 * ie call sock_release_ownership(sk) before us.
2408 if (sk->sk_prot->release_cb)
2409 sk->sk_prot->release_cb(sk);
2411 sock_release_ownership(sk);
2412 if (waitqueue_active(&sk->sk_lock.wq))
2413 wake_up(&sk->sk_lock.wq);
2414 spin_unlock_bh(&sk->sk_lock.slock);
2416 EXPORT_SYMBOL(release_sock);
2419 * lock_sock_fast - fast version of lock_sock
2422 * This version should be used for very small section, where process wont block
2423 * return false if fast path is taken
2424 * sk_lock.slock locked, owned = 0, BH disabled
2425 * return true if slow path is taken
2426 * sk_lock.slock unlocked, owned = 1, BH enabled
2428 bool lock_sock_fast(struct sock *sk)
2431 spin_lock_bh(&sk->sk_lock.slock);
2433 if (!sk->sk_lock.owned)
2435 * Note : We must disable BH
2440 sk->sk_lock.owned = 1;
2441 spin_unlock(&sk->sk_lock.slock);
2443 * The sk_lock has mutex_lock() semantics here:
2445 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2449 EXPORT_SYMBOL(lock_sock_fast);
2451 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2454 if (!sock_flag(sk, SOCK_TIMESTAMP))
2455 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2456 tv = ktime_to_timeval(sk->sk_stamp);
2457 if (tv.tv_sec == -1)
2459 if (tv.tv_sec == 0) {
2460 sk->sk_stamp = ktime_get_real();
2461 tv = ktime_to_timeval(sk->sk_stamp);
2463 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
2465 EXPORT_SYMBOL(sock_get_timestamp);
2467 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2470 if (!sock_flag(sk, SOCK_TIMESTAMP))
2471 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2472 ts = ktime_to_timespec(sk->sk_stamp);
2473 if (ts.tv_sec == -1)
2475 if (ts.tv_sec == 0) {
2476 sk->sk_stamp = ktime_get_real();
2477 ts = ktime_to_timespec(sk->sk_stamp);
2479 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2481 EXPORT_SYMBOL(sock_get_timestampns);
2483 void sock_enable_timestamp(struct sock *sk, int flag)
2485 if (!sock_flag(sk, flag)) {
2486 unsigned long previous_flags = sk->sk_flags;
2488 sock_set_flag(sk, flag);
2490 * we just set one of the two flags which require net
2491 * time stamping, but time stamping might have been on
2492 * already because of the other one
2494 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
2495 net_enable_timestamp();
2499 int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2500 int level, int type)
2502 struct sock_exterr_skb *serr;
2503 struct sk_buff *skb, *skb2;
2507 skb = skb_dequeue(&sk->sk_error_queue);
2513 msg->msg_flags |= MSG_TRUNC;
2516 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2520 sock_recv_timestamp(msg, sk, skb);
2522 serr = SKB_EXT_ERR(skb);
2523 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2525 msg->msg_flags |= MSG_ERRQUEUE;
2528 /* Reset and regenerate socket error */
2529 spin_lock_bh(&sk->sk_error_queue.lock);
2531 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
2532 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
2533 spin_unlock_bh(&sk->sk_error_queue.lock);
2534 sk->sk_error_report(sk);
2536 spin_unlock_bh(&sk->sk_error_queue.lock);
2543 EXPORT_SYMBOL(sock_recv_errqueue);
2546 * Get a socket option on an socket.
2548 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2549 * asynchronous errors should be reported by getsockopt. We assume
2550 * this means if you specify SO_ERROR (otherwise whats the point of it).
2552 int sock_common_getsockopt(struct socket *sock, int level, int optname,
2553 char __user *optval, int __user *optlen)
2555 struct sock *sk = sock->sk;
2557 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2559 EXPORT_SYMBOL(sock_common_getsockopt);
2561 #ifdef CONFIG_COMPAT
2562 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2563 char __user *optval, int __user *optlen)
2565 struct sock *sk = sock->sk;
2567 if (sk->sk_prot->compat_getsockopt != NULL)
2568 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2570 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2572 EXPORT_SYMBOL(compat_sock_common_getsockopt);
2575 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2576 struct msghdr *msg, size_t size, int flags)
2578 struct sock *sk = sock->sk;
2582 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2583 flags & ~MSG_DONTWAIT, &addr_len);
2585 msg->msg_namelen = addr_len;
2588 EXPORT_SYMBOL(sock_common_recvmsg);
2591 * Set socket options on an inet socket.
2593 int sock_common_setsockopt(struct socket *sock, int level, int optname,
2594 char __user *optval, unsigned int optlen)
2596 struct sock *sk = sock->sk;
2598 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2600 EXPORT_SYMBOL(sock_common_setsockopt);
2602 #ifdef CONFIG_COMPAT
2603 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2604 char __user *optval, unsigned int optlen)
2606 struct sock *sk = sock->sk;
2608 if (sk->sk_prot->compat_setsockopt != NULL)
2609 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2611 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2613 EXPORT_SYMBOL(compat_sock_common_setsockopt);
2616 void sk_common_release(struct sock *sk)
2618 if (sk->sk_prot->destroy)
2619 sk->sk_prot->destroy(sk);
2622 * Observation: when sock_common_release is called, processes have
2623 * no access to socket. But net still has.
2624 * Step one, detach it from networking:
2626 * A. Remove from hash tables.
2629 sk->sk_prot->unhash(sk);
2632 * In this point socket cannot receive new packets, but it is possible
2633 * that some packets are in flight because some CPU runs receiver and
2634 * did hash table lookup before we unhashed socket. They will achieve
2635 * receive queue and will be purged by socket destructor.
2637 * Also we still have packets pending on receive queue and probably,
2638 * our own packets waiting in device queues. sock_destroy will drain
2639 * receive queue, but transmitted packets will delay socket destruction
2640 * until the last reference will be released.
2645 xfrm_sk_free_policy(sk);
2647 sk_refcnt_debug_release(sk);
2649 if (sk->sk_frag.page) {
2650 put_page(sk->sk_frag.page);
2651 sk->sk_frag.page = NULL;
2656 EXPORT_SYMBOL(sk_common_release);
2658 #ifdef CONFIG_PROC_FS
2659 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
2661 int val[PROTO_INUSE_NR];
2664 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2666 #ifdef CONFIG_NET_NS
2667 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2669 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
2671 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2673 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2675 int cpu, idx = prot->inuse_idx;
2678 for_each_possible_cpu(cpu)
2679 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2681 return res >= 0 ? res : 0;
2683 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2685 static int __net_init sock_inuse_init_net(struct net *net)
2687 net->core.inuse = alloc_percpu(struct prot_inuse);
2688 return net->core.inuse ? 0 : -ENOMEM;
2691 static void __net_exit sock_inuse_exit_net(struct net *net)
2693 free_percpu(net->core.inuse);
2696 static struct pernet_operations net_inuse_ops = {
2697 .init = sock_inuse_init_net,
2698 .exit = sock_inuse_exit_net,
2701 static __init int net_inuse_init(void)
2703 if (register_pernet_subsys(&net_inuse_ops))
2704 panic("Cannot initialize net inuse counters");
2709 core_initcall(net_inuse_init);
2711 static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2713 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2715 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
2717 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2719 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2721 int cpu, idx = prot->inuse_idx;
2724 for_each_possible_cpu(cpu)
2725 res += per_cpu(prot_inuse, cpu).val[idx];
2727 return res >= 0 ? res : 0;
2729 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2732 static void assign_proto_idx(struct proto *prot)
2734 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2736 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2737 pr_err("PROTO_INUSE_NR exhausted\n");
2741 set_bit(prot->inuse_idx, proto_inuse_idx);
2744 static void release_proto_idx(struct proto *prot)
2746 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2747 clear_bit(prot->inuse_idx, proto_inuse_idx);
2750 static inline void assign_proto_idx(struct proto *prot)
2754 static inline void release_proto_idx(struct proto *prot)
2759 int proto_register(struct proto *prot, int alloc_slab)
2762 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2763 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2766 if (prot->slab == NULL) {
2767 pr_crit("%s: Can't create sock SLAB cache!\n",
2772 if (prot->rsk_prot != NULL) {
2773 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
2774 if (prot->rsk_prot->slab_name == NULL)
2775 goto out_free_sock_slab;
2777 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2778 prot->rsk_prot->obj_size, 0,
2779 SLAB_HWCACHE_ALIGN, NULL);
2781 if (prot->rsk_prot->slab == NULL) {
2782 pr_crit("%s: Can't create request sock SLAB cache!\n",
2784 goto out_free_request_sock_slab_name;
2788 if (prot->twsk_prot != NULL) {
2789 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
2791 if (prot->twsk_prot->twsk_slab_name == NULL)
2792 goto out_free_request_sock_slab;
2794 prot->twsk_prot->twsk_slab =
2795 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2796 prot->twsk_prot->twsk_obj_size,
2798 SLAB_HWCACHE_ALIGN |
2801 if (prot->twsk_prot->twsk_slab == NULL)
2802 goto out_free_timewait_sock_slab_name;
2806 mutex_lock(&proto_list_mutex);
2807 list_add(&prot->node, &proto_list);
2808 assign_proto_idx(prot);
2809 mutex_unlock(&proto_list_mutex);
2812 out_free_timewait_sock_slab_name:
2813 kfree(prot->twsk_prot->twsk_slab_name);
2814 out_free_request_sock_slab:
2815 if (prot->rsk_prot && prot->rsk_prot->slab) {
2816 kmem_cache_destroy(prot->rsk_prot->slab);
2817 prot->rsk_prot->slab = NULL;
2819 out_free_request_sock_slab_name:
2821 kfree(prot->rsk_prot->slab_name);
2823 kmem_cache_destroy(prot->slab);
2828 EXPORT_SYMBOL(proto_register);
2830 void proto_unregister(struct proto *prot)
2832 mutex_lock(&proto_list_mutex);
2833 release_proto_idx(prot);
2834 list_del(&prot->node);
2835 mutex_unlock(&proto_list_mutex);
2837 if (prot->slab != NULL) {
2838 kmem_cache_destroy(prot->slab);
2842 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2843 kmem_cache_destroy(prot->rsk_prot->slab);
2844 kfree(prot->rsk_prot->slab_name);
2845 prot->rsk_prot->slab = NULL;
2848 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2849 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2850 kfree(prot->twsk_prot->twsk_slab_name);
2851 prot->twsk_prot->twsk_slab = NULL;
2854 EXPORT_SYMBOL(proto_unregister);
2856 #ifdef CONFIG_PROC_FS
2857 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2858 __acquires(proto_list_mutex)
2860 mutex_lock(&proto_list_mutex);
2861 return seq_list_start_head(&proto_list, *pos);
2864 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2866 return seq_list_next(v, &proto_list, pos);
2869 static void proto_seq_stop(struct seq_file *seq, void *v)
2870 __releases(proto_list_mutex)
2872 mutex_unlock(&proto_list_mutex);
2875 static char proto_method_implemented(const void *method)
2877 return method == NULL ? 'n' : 'y';
2879 static long sock_prot_memory_allocated(struct proto *proto)
2881 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
2884 static char *sock_prot_memory_pressure(struct proto *proto)
2886 return proto->memory_pressure != NULL ?
2887 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2890 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2893 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
2894 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2897 sock_prot_inuse_get(seq_file_net(seq), proto),
2898 sock_prot_memory_allocated(proto),
2899 sock_prot_memory_pressure(proto),
2901 proto->slab == NULL ? "no" : "yes",
2902 module_name(proto->owner),
2903 proto_method_implemented(proto->close),
2904 proto_method_implemented(proto->connect),
2905 proto_method_implemented(proto->disconnect),
2906 proto_method_implemented(proto->accept),
2907 proto_method_implemented(proto->ioctl),
2908 proto_method_implemented(proto->init),
2909 proto_method_implemented(proto->destroy),
2910 proto_method_implemented(proto->shutdown),
2911 proto_method_implemented(proto->setsockopt),
2912 proto_method_implemented(proto->getsockopt),
2913 proto_method_implemented(proto->sendmsg),
2914 proto_method_implemented(proto->recvmsg),
2915 proto_method_implemented(proto->sendpage),
2916 proto_method_implemented(proto->bind),
2917 proto_method_implemented(proto->backlog_rcv),
2918 proto_method_implemented(proto->hash),
2919 proto_method_implemented(proto->unhash),
2920 proto_method_implemented(proto->get_port),
2921 proto_method_implemented(proto->enter_memory_pressure));
2924 static int proto_seq_show(struct seq_file *seq, void *v)
2926 if (v == &proto_list)
2927 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2936 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2938 proto_seq_printf(seq, list_entry(v, struct proto, node));
2942 static const struct seq_operations proto_seq_ops = {
2943 .start = proto_seq_start,
2944 .next = proto_seq_next,
2945 .stop = proto_seq_stop,
2946 .show = proto_seq_show,
2949 static int proto_seq_open(struct inode *inode, struct file *file)
2951 return seq_open_net(inode, file, &proto_seq_ops,
2952 sizeof(struct seq_net_private));
2955 static const struct file_operations proto_seq_fops = {
2956 .owner = THIS_MODULE,
2957 .open = proto_seq_open,
2959 .llseek = seq_lseek,
2960 .release = seq_release_net,
2963 static __net_init int proto_init_net(struct net *net)
2965 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
2971 static __net_exit void proto_exit_net(struct net *net)
2973 remove_proc_entry("protocols", net->proc_net);
2977 static __net_initdata struct pernet_operations proto_net_ops = {
2978 .init = proto_init_net,
2979 .exit = proto_exit_net,
2982 static int __init proto_init(void)
2984 return register_pernet_subsys(&proto_net_ops);
2987 subsys_initcall(proto_init);
2989 #endif /* PROC_FS */