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unix: Remove unused field from unix_sock
[mirror_ubuntu-hirsute-kernel.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 1/*
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.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 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>
14 *
15 * Fixes:
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
4ec93edb 35 * code. The ACK stuff can wait and needs major
1da177e4
LT		 36 * TCP layer surgery.
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
64 * (compatibility fix)
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
82 *
83 * To Fix:
84 *
85 *
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.
90 */
91
e005d193
JP		 92#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
93
4fc268d2 94#include <linux/capability.h>
1da177e4
LT		 95#include <linux/errno.h>
96#include <linux/types.h>
97#include <linux/socket.h>
98#include <linux/in.h>
99#include <linux/kernel.h>
1da177e4
LT		 100#include <linux/module.h>
101#include <linux/proc_fs.h>
102#include <linux/seq_file.h>
103#include <linux/sched.h>
104#include <linux/timer.h>
105#include <linux/string.h>
106#include <linux/sockios.h>
107#include <linux/net.h>
108#include <linux/mm.h>
109#include <linux/slab.h>
110#include <linux/interrupt.h>
111#include <linux/poll.h>
112#include <linux/tcp.h>
113#include <linux/init.h>
a1f8e7f7 114#include <linux/highmem.h>
3f551f94 115#include <linux/user_namespace.h>
c5905afb 116#include <linux/static_key.h>
3969eb38 117#include <linux/memcontrol.h>
8c1ae10d 118#include <linux/prefetch.h>
1da177e4
LT		 119
120#include <asm/uaccess.h>
1da177e4
LT		 121
122#include <linux/netdevice.h>
123#include <net/protocol.h>
124#include <linux/skbuff.h>
457c4cbc 125#include <net/net_namespace.h>
2e6599cb 126#include <net/request_sock.h>
1da177e4 127#include <net/sock.h>
20d49473 128#include <linux/net_tstamp.h>
1da177e4
LT		 129#include <net/xfrm.h>
130#include <linux/ipsec.h>
f8451725 131#include <net/cls_cgroup.h>
5bc1421e 132#include <net/netprio_cgroup.h>
1da177e4
LT		 133
134#include <linux/filter.h>
135
3847ce32
SM		 136#include <trace/events/sock.h>
137
1da177e4
LT		 138#ifdef CONFIG_INET
139#include <net/tcp.h>
140#endif
141
36b77a52 142static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 143static LIST_HEAD(proto_list);
144
c255a458 145#ifdef CONFIG_MEMCG_KMEM
1d62e436 146int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
d1a4c0b3
GC		 147{
148 struct proto *proto;
149 int ret = 0;
150
36b77a52 151 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 152 list_for_each_entry(proto, &proto_list, node) {
153 if (proto->init_cgroup) {
1d62e436 154 ret = proto->init_cgroup(memcg, ss);
d1a4c0b3
GC		 155 if (ret)
156 goto out;
157 }
158 }
159
36b77a52 160 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 161 return ret;
162out:
163 list_for_each_entry_continue_reverse(proto, &proto_list, node)
164 if (proto->destroy_cgroup)
1d62e436 165 proto->destroy_cgroup(memcg);
36b77a52 166 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 167 return ret;
168}
169
1d62e436 170void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
d1a4c0b3
GC		 171{
172 struct proto *proto;
173
36b77a52 174 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 175 list_for_each_entry_reverse(proto, &proto_list, node)
176 if (proto->destroy_cgroup)
1d62e436 177 proto->destroy_cgroup(memcg);
36b77a52 178 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 179}
180#endif
181
da21f24d
IM		 182/*
183 * Each address family might have different locking rules, so we have
184 * one slock key per address family:
185 */
a5b5bb9a
IM		 186static struct lock_class_key af_family_keys[AF_MAX];
187static struct lock_class_key af_family_slock_keys[AF_MAX];
188
c5905afb 189struct static_key memcg_socket_limit_enabled;
e1aab161
GC		 190EXPORT_SYMBOL(memcg_socket_limit_enabled);
191
a5b5bb9a
IM		 192/*
193 * Make lock validator output more readable. (we pre-construct these
194 * strings build-time, so that runtime initialization of socket
195 * locks is fast):
196 */
36cbd3dc 197static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 198 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
199 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
200 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
201 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
202 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
203 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
204 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 205 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 206 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 207 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 208 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 209 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 210 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
c7fe3b52 211 "sk_lock-AF_NFC" , "sk_lock-AF_MAX"
a5b5bb9a 212};
36cbd3dc 213static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 214 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
215 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
216 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
217 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
218 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
219 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
220 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 221 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 222 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 223 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 224 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 225 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 226 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
c7fe3b52 227 "slock-AF_NFC" , "slock-AF_MAX"
a5b5bb9a 228};
36cbd3dc 229static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 230 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
231 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
232 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
233 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
234 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
235 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
236 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 237 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 238 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 239 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 240 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 241 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 242 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
c7fe3b52 243 "clock-AF_NFC" , "clock-AF_MAX"
443aef0e 244};
da21f24d
IM		 245
246/*
247 * sk_callback_lock locking rules are per-address-family,
248 * so split the lock classes by using a per-AF key:
249 */
250static struct lock_class_key af_callback_keys[AF_MAX];
251
1da177e4
LT		 252/* Take into consideration the size of the struct sk_buff overhead in the
253 * determination of these values, since that is non-constant across
254 * platforms. This makes socket queueing behavior and performance
255 * not depend upon such differences.
256 */
257#define _SK_MEM_PACKETS 256
87fb4b7b 258#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 259#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
260#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
261
262/* Run time adjustable parameters. */
ab32ea5d 263__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 264EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 265__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 266EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 267__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
268__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 269
25985edc 270/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 271int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 272EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 273
c93bdd0e
MG		 274struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
275EXPORT_SYMBOL_GPL(memalloc_socks);
276
7cb02404
MG		 277/**
278 * sk_set_memalloc - sets %SOCK_MEMALLOC
279 * @sk: socket to set it on
280 *
281 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
282 * It's the responsibility of the admin to adjust min_free_kbytes
283 * to meet the requirements
284 */
285void sk_set_memalloc(struct sock *sk)
286{
287 sock_set_flag(sk, SOCK_MEMALLOC);
288 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 289 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 290}
291EXPORT_SYMBOL_GPL(sk_set_memalloc);
292
293void sk_clear_memalloc(struct sock *sk)
294{
295 sock_reset_flag(sk, SOCK_MEMALLOC);
296 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 297 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 298
299 /*
300 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
301 * progress of swapping. However, if SOCK_MEMALLOC is cleared while
302 * it has rmem allocations there is a risk that the user of the
303 * socket cannot make forward progress due to exceeding the rmem
304 * limits. By rights, sk_clear_memalloc() should only be called
305 * on sockets being torn down but warn and reset the accounting if
306 * that assumption breaks.
307 */
308 if (WARN_ON(sk->sk_forward_alloc))
309 sk_mem_reclaim(sk);
7cb02404
MG		 310}
311EXPORT_SYMBOL_GPL(sk_clear_memalloc);
312
b4b9e355
MG		 313int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
314{
315 int ret;
316 unsigned long pflags = current->flags;
317
318 /* these should have been dropped before queueing */
319 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
320
321 current->flags |= PF_MEMALLOC;
322 ret = sk->sk_backlog_rcv(sk, skb);
323 tsk_restore_flags(current, pflags, PF_MEMALLOC);
324
325 return ret;
326}
327EXPORT_SYMBOL(__sk_backlog_rcv);
328
1da177e4
LT		 329static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
330{
331 struct timeval tv;
332
333 if (optlen < sizeof(tv))
334 return -EINVAL;
335 if (copy_from_user(&tv, optval, sizeof(tv)))
336 return -EFAULT;
ba78073e
VA		 337 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
338 return -EDOM;
1da177e4 339
ba78073e 340 if (tv.tv_sec < 0) {
6f11df83
AM		 341 static int warned __read_mostly;
342
ba78073e 343 *timeo_p = 0;
50aab54f 344 if (warned < 10 && net_ratelimit()) {
ba78073e 345 warned++;
e005d193
JP		 346 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
347 __func__, current->comm, task_pid_nr(current));
50aab54f 348 }
ba78073e
VA		 349 return 0;
350 }
1da177e4
LT		 351 *timeo_p = MAX_SCHEDULE_TIMEOUT;
352 if (tv.tv_sec == 0 && tv.tv_usec == 0)
353 return 0;
354 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
355 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
356 return 0;
357}
358
359static void sock_warn_obsolete_bsdism(const char *name)
360{
361 static int warned;
362 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 363 if (strcmp(warncomm, current->comm) && warned < 5) {
364 strcpy(warncomm, current->comm);
e005d193
JP		 365 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
366 warncomm, name);
1da177e4
LT		 367 warned++;
368 }
369}
370
08e29af3
ED		 371#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
372
373static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 374{
08e29af3
ED		 375 if (sk->sk_flags & flags) {
376 sk->sk_flags &= ~flags;
377 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 378 net_disable_timestamp();
1da177e4
LT		 379 }
380}
381
382
f0088a50
DV		 383int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
384{
766e9037 385 int err;
f0088a50 386 int skb_len;
3b885787
NH		 387 unsigned long flags;
388 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 389
0fd7bac6 390 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 391 atomic_inc(&sk->sk_drops);
3847ce32 392 trace_sock_rcvqueue_full(sk, skb);
766e9037 393 return -ENOMEM;
f0088a50
DV		 394 }
395
fda9ef5d 396 err = sk_filter(sk, skb);
f0088a50 397 if (err)
766e9037 398 return err;
f0088a50 399
c76562b6 400 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 401 atomic_inc(&sk->sk_drops);
402 return -ENOBUFS;
3ab224be
HA		 403 }
404
f0088a50
DV		 405 skb->dev = NULL;
406 skb_set_owner_r(skb, sk);
49ad9599 407
f0088a50
DV		 408 /* Cache the SKB length before we tack it onto the receive
409 * queue. Once it is added it no longer belongs to us and
410 * may be freed by other threads of control pulling packets
411 * from the queue.
412 */
413 skb_len = skb->len;
414
7fee226a
ED		 415 /* we escape from rcu protected region, make sure we dont leak
416 * a norefcounted dst
417 */
418 skb_dst_force(skb);
419
3b885787
NH		 420 spin_lock_irqsave(&list->lock, flags);
421 skb->dropcount = atomic_read(&sk->sk_drops);
422 __skb_queue_tail(list, skb);
423 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 424
425 if (!sock_flag(sk, SOCK_DEAD))
426 sk->sk_data_ready(sk, skb_len);
766e9037 427 return 0;
f0088a50
DV		 428}
429EXPORT_SYMBOL(sock_queue_rcv_skb);
430
58a5a7b9 431int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 432{
433 int rc = NET_RX_SUCCESS;
434
fda9ef5d 435 if (sk_filter(sk, skb))
f0088a50
DV		 436 goto discard_and_relse;
437
438 skb->dev = NULL;
439
f545a38f 440 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) {
c377411f
ED		 441 atomic_inc(&sk->sk_drops);
442 goto discard_and_relse;
443 }
58a5a7b9
ACM		 444 if (nested)
445 bh_lock_sock_nested(sk);
446 else
447 bh_lock_sock(sk);
a5b5bb9a
IM		 448 if (!sock_owned_by_user(sk)) {
449 /*
450 * trylock + unlock semantics:
451 */
452 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
453
c57943a1 454 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 455
456 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 457 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 458 bh_unlock_sock(sk);
459 atomic_inc(&sk->sk_drops);
460 goto discard_and_relse;
461 }
462
f0088a50
DV		 463 bh_unlock_sock(sk);
464out:
465 sock_put(sk);
466 return rc;
467discard_and_relse:
468 kfree_skb(skb);
469 goto out;
470}
471EXPORT_SYMBOL(sk_receive_skb);
472
ea94ff3b
KK		 473void sk_reset_txq(struct sock *sk)
474{
475 sk_tx_queue_clear(sk);
476}
477EXPORT_SYMBOL(sk_reset_txq);
478
f0088a50
DV		 479struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
480{
b6c6712a 481 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 482
483 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 484 sk_tx_queue_clear(sk);
a9b3cd7f 485 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 486 dst_release(dst);
487 return NULL;
488 }
489
490 return dst;
491}
492EXPORT_SYMBOL(__sk_dst_check);
493
494struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
495{
496 struct dst_entry *dst = sk_dst_get(sk);
497
498 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
499 sk_dst_reset(sk);
500 dst_release(dst);
501 return NULL;
502 }
503
504 return dst;
505}
506EXPORT_SYMBOL(sk_dst_check);
507
4878809f
DM		 508static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
509{
510 int ret = -ENOPROTOOPT;
511#ifdef CONFIG_NETDEVICES
3b1e0a65 512 struct net *net = sock_net(sk);
4878809f
DM		 513 char devname[IFNAMSIZ];
514 int index;
515
516 /* Sorry... */
517 ret = -EPERM;
518 if (!capable(CAP_NET_RAW))
519 goto out;
520
521 ret = -EINVAL;
522 if (optlen < 0)
523 goto out;
524
525 /* Bind this socket to a particular device like "eth0",
526 * as specified in the passed interface name. If the
527 * name is "" or the option length is zero the socket
528 * is not bound.
529 */
530 if (optlen > IFNAMSIZ - 1)
531 optlen = IFNAMSIZ - 1;
532 memset(devname, 0, sizeof(devname));
533
534 ret = -EFAULT;
535 if (copy_from_user(devname, optval, optlen))
536 goto out;
537
000ba2e4
DM		 538 index = 0;
539 if (devname[0] != '\0') {
bf8e56bf 540 struct net_device *dev;
4878809f 541
bf8e56bf
ED		 542 rcu_read_lock();
543 dev = dev_get_by_name_rcu(net, devname);
544 if (dev)
545 index = dev->ifindex;
546 rcu_read_unlock();
4878809f
DM		 547 ret = -ENODEV;
548 if (!dev)
549 goto out;
4878809f
DM		 550 }
551
552 lock_sock(sk);
553 sk->sk_bound_dev_if = index;
554 sk_dst_reset(sk);
555 release_sock(sk);
556
557 ret = 0;
558
559out:
560#endif
561
562 return ret;
563}
564
c0ef877b
PE		 565static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
566{
567 if (valbool)
568 sock_set_flag(sk, bit);
569 else
570 sock_reset_flag(sk, bit);
571}
572
1da177e4
LT		 573/*
574 * This is meant for all protocols to use and covers goings on
575 * at the socket level. Everything here is generic.
576 */
577
578int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 579 char __user *optval, unsigned int optlen)
1da177e4 580{
2a91525c 581 struct sock *sk = sock->sk;
1da177e4
LT		 582 int val;
583 int valbool;
584 struct linger ling;
585 int ret = 0;
4ec93edb 586
1da177e4
LT		 587 /*
588 * Options without arguments
589 */
590
4878809f
DM		 591 if (optname == SO_BINDTODEVICE)
592 return sock_bindtodevice(sk, optval, optlen);
593
e71a4783
SH		 594 if (optlen < sizeof(int))
595 return -EINVAL;
4ec93edb 596
1da177e4
LT		 597 if (get_user(val, (int __user *)optval))
598 return -EFAULT;
4ec93edb 599
2a91525c 600 valbool = val ? 1 : 0;
1da177e4
LT		 601
602 lock_sock(sk);
603
2a91525c 604 switch (optname) {
e71a4783 605 case SO_DEBUG:
2a91525c 606 if (val && !capable(CAP_NET_ADMIN))
e71a4783 607 ret = -EACCES;
2a91525c 608 else
c0ef877b 609 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 610 break;
611 case SO_REUSEADDR:
4a17fd52 612 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783
SH		 613 break;
614 case SO_TYPE:
49c794e9 615 case SO_PROTOCOL:
0d6038ee 616 case SO_DOMAIN:
e71a4783
SH		 617 case SO_ERROR:
618 ret = -ENOPROTOOPT;
619 break;
620 case SO_DONTROUTE:
c0ef877b 621 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 622 break;
623 case SO_BROADCAST:
624 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
625 break;
626 case SO_SNDBUF:
627 /* Don't error on this BSD doesn't and if you think
82981930
ED		 628 * about it this is right. Otherwise apps have to
629 * play 'guess the biggest size' games. RCVBUF/SNDBUF
630 * are treated in BSD as hints
631 */
632 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 633set_sndbuf:
e71a4783 634 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 635 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
636 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 637 sk->sk_write_space(sk);
638 break;
1da177e4 639
e71a4783
SH		 640 case SO_SNDBUFFORCE:
641 if (!capable(CAP_NET_ADMIN)) {
642 ret = -EPERM;
643 break;
644 }
645 goto set_sndbuf;
b0573dea 646
e71a4783
SH		 647 case SO_RCVBUF:
648 /* Don't error on this BSD doesn't and if you think
82981930
ED		 649 * about it this is right. Otherwise apps have to
650 * play 'guess the biggest size' games. RCVBUF/SNDBUF
651 * are treated in BSD as hints
652 */
653 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 654set_rcvbuf:
e71a4783
SH		 655 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
656 /*
657 * We double it on the way in to account for
658 * "struct sk_buff" etc. overhead. Applications
659 * assume that the SO_RCVBUF setting they make will
660 * allow that much actual data to be received on that
661 * socket.
662 *
663 * Applications are unaware that "struct sk_buff" and
664 * other overheads allocate from the receive buffer
665 * during socket buffer allocation.
666 *
667 * And after considering the possible alternatives,
668 * returning the value we actually used in getsockopt
669 * is the most desirable behavior.
670 */
82981930 671 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 672 break;
673
674 case SO_RCVBUFFORCE:
675 if (!capable(CAP_NET_ADMIN)) {
676 ret = -EPERM;
1da177e4 677 break;
e71a4783
SH		 678 }
679 goto set_rcvbuf;
1da177e4 680
e71a4783 681 case SO_KEEPALIVE:
1da177e4 682#ifdef CONFIG_INET
3e10986d
ED		 683 if (sk->sk_protocol == IPPROTO_TCP &&
684 sk->sk_type == SOCK_STREAM)
e71a4783 685 tcp_set_keepalive(sk, valbool);
1da177e4 686#endif
e71a4783
SH		 687 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
688 break;
689
690 case SO_OOBINLINE:
691 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
692 break;
693
694 case SO_NO_CHECK:
695 sk->sk_no_check = valbool;
696 break;
697
698 case SO_PRIORITY:
699 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
700 sk->sk_priority = val;
701 else
702 ret = -EPERM;
703 break;
704
705 case SO_LINGER:
706 if (optlen < sizeof(ling)) {
707 ret = -EINVAL; /* 1003.1g */
1da177e4 708 break;
e71a4783 709 }
2a91525c 710 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 711 ret = -EFAULT;
1da177e4 712 break;
e71a4783
SH		 713 }
714 if (!ling.l_onoff)
715 sock_reset_flag(sk, SOCK_LINGER);
716 else {
1da177e4 717#if (BITS_PER_LONG == 32)
e71a4783
SH		 718 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
719 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 720 else
e71a4783
SH		 721#endif
722 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
723 sock_set_flag(sk, SOCK_LINGER);
724 }
725 break;
726
727 case SO_BSDCOMPAT:
728 sock_warn_obsolete_bsdism("setsockopt");
729 break;
730
731 case SO_PASSCRED:
732 if (valbool)
733 set_bit(SOCK_PASSCRED, &sock->flags);
734 else
735 clear_bit(SOCK_PASSCRED, &sock->flags);
736 break;
737
738 case SO_TIMESTAMP:
92f37fd2 739 case SO_TIMESTAMPNS:
e71a4783 740 if (valbool) {
92f37fd2
ED		 741 if (optname == SO_TIMESTAMP)
742 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
743 else
744 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 745 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 746 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 747 } else {
e71a4783 748 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 749 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
750 }
e71a4783
SH		 751 break;
752
20d49473
PO		 753 case SO_TIMESTAMPING:
754 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 755 ret = -EINVAL;
20d49473
PO		 756 break;
757 }
758 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
759 val & SOF_TIMESTAMPING_TX_HARDWARE);
760 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
761 val & SOF_TIMESTAMPING_TX_SOFTWARE);
762 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
763 val & SOF_TIMESTAMPING_RX_HARDWARE);
764 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
765 sock_enable_timestamp(sk,
766 SOCK_TIMESTAMPING_RX_SOFTWARE);
767 else
768 sock_disable_timestamp(sk,
08e29af3 769 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 770 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
771 val & SOF_TIMESTAMPING_SOFTWARE);
772 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
773 val & SOF_TIMESTAMPING_SYS_HARDWARE);
774 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
775 val & SOF_TIMESTAMPING_RAW_HARDWARE);
776 break;
777
e71a4783
SH		 778 case SO_RCVLOWAT:
779 if (val < 0)
780 val = INT_MAX;
781 sk->sk_rcvlowat = val ? : 1;
782 break;
783
784 case SO_RCVTIMEO:
785 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
786 break;
787
788 case SO_SNDTIMEO:
789 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
790 break;
1da177e4 791
e71a4783
SH		 792 case SO_ATTACH_FILTER:
793 ret = -EINVAL;
794 if (optlen == sizeof(struct sock_fprog)) {
795 struct sock_fprog fprog;
1da177e4 796
e71a4783
SH		 797 ret = -EFAULT;
798 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 799 break;
e71a4783
SH		 800
801 ret = sk_attach_filter(&fprog, sk);
802 }
803 break;
804
805 case SO_DETACH_FILTER:
55b33325 806 ret = sk_detach_filter(sk);
e71a4783 807 break;
1da177e4 808
e71a4783
SH		 809 case SO_PASSSEC:
810 if (valbool)
811 set_bit(SOCK_PASSSEC, &sock->flags);
812 else
813 clear_bit(SOCK_PASSSEC, &sock->flags);
814 break;
4a19ec58
LAT		 815 case SO_MARK:
816 if (!capable(CAP_NET_ADMIN))
817 ret = -EPERM;
2a91525c 818 else
4a19ec58 819 sk->sk_mark = val;
4a19ec58 820 break;
877ce7c1 821
1da177e4
LT		 822 /* We implement the SO_SNDLOWAT etc to
823 not be settable (1003.1g 5.3) */
3b885787 824 case SO_RXQ_OVFL:
8083f0fc 825 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 826 break;
6e3e939f
JB		 827
828 case SO_WIFI_STATUS:
829 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
830 break;
831
ef64a54f
PE		 832 case SO_PEEK_OFF:
833 if (sock->ops->set_peek_off)
834 sock->ops->set_peek_off(sk, val);
835 else
836 ret = -EOPNOTSUPP;
837 break;
3bdc0eba
BG		 838
839 case SO_NOFCS:
840 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
841 break;
842
e71a4783
SH		 843 default:
844 ret = -ENOPROTOOPT;
845 break;
4ec93edb 846 }
1da177e4
LT		 847 release_sock(sk);
848 return ret;
849}
2a91525c 850EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 851
852
3f551f94
EB		 853void cred_to_ucred(struct pid *pid, const struct cred *cred,
854 struct ucred *ucred)
855{
856 ucred->pid = pid_vnr(pid);
857 ucred->uid = ucred->gid = -1;
858 if (cred) {
859 struct user_namespace *current_ns = current_user_ns();
860
b2e4f544
EB		 861 ucred->uid = from_kuid_munged(current_ns, cred->euid);
862 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 863 }
864}
3924773a 865EXPORT_SYMBOL_GPL(cred_to_ucred);
3f551f94 866
1da177e4
LT		 867int sock_getsockopt(struct socket *sock, int level, int optname,
868 char __user *optval, int __user *optlen)
869{
870 struct sock *sk = sock->sk;
4ec93edb 871
e71a4783 872 union {
4ec93edb
YH		 873 int val;
874 struct linger ling;
1da177e4
LT		 875 struct timeval tm;
876 } v;
4ec93edb 877
4d0392be 878 int lv = sizeof(int);
1da177e4 879 int len;
4ec93edb 880
e71a4783 881 if (get_user(len, optlen))
4ec93edb 882 return -EFAULT;
e71a4783 883 if (len < 0)
1da177e4 884 return -EINVAL;
4ec93edb 885
50fee1de 886 memset(&v, 0, sizeof(v));
df0bca04 887
2a91525c 888 switch (optname) {
e71a4783
SH		 889 case SO_DEBUG:
890 v.val = sock_flag(sk, SOCK_DBG);
891 break;
892
893 case SO_DONTROUTE:
894 v.val = sock_flag(sk, SOCK_LOCALROUTE);
895 break;
896
897 case SO_BROADCAST:
1b23a5df 898 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 899 break;
900
901 case SO_SNDBUF:
902 v.val = sk->sk_sndbuf;
903 break;
904
905 case SO_RCVBUF:
906 v.val = sk->sk_rcvbuf;
907 break;
908
909 case SO_REUSEADDR:
910 v.val = sk->sk_reuse;
911 break;
912
913 case SO_KEEPALIVE:
1b23a5df 914 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 915 break;
916
917 case SO_TYPE:
918 v.val = sk->sk_type;
919 break;
920
49c794e9
JE		 921 case SO_PROTOCOL:
922 v.val = sk->sk_protocol;
923 break;
924
0d6038ee
JE		 925 case SO_DOMAIN:
926 v.val = sk->sk_family;
927 break;
928
e71a4783
SH		 929 case SO_ERROR:
930 v.val = -sock_error(sk);
2a91525c 931 if (v.val == 0)
e71a4783
SH		 932 v.val = xchg(&sk->sk_err_soft, 0);
933 break;
934
935 case SO_OOBINLINE:
1b23a5df 936 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 937 break;
938
939 case SO_NO_CHECK:
940 v.val = sk->sk_no_check;
941 break;
942
943 case SO_PRIORITY:
944 v.val = sk->sk_priority;
945 break;
946
947 case SO_LINGER:
948 lv = sizeof(v.ling);
1b23a5df 949 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 950 v.ling.l_linger = sk->sk_lingertime / HZ;
951 break;
952
953 case SO_BSDCOMPAT:
954 sock_warn_obsolete_bsdism("getsockopt");
955 break;
956
957 case SO_TIMESTAMP:
92f37fd2
ED		 958 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
959 !sock_flag(sk, SOCK_RCVTSTAMPNS);
960 break;
961
962 case SO_TIMESTAMPNS:
963 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 964 break;
965
20d49473
PO		 966 case SO_TIMESTAMPING:
967 v.val = 0;
968 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
969 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
970 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
971 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
972 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
973 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
974 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
975 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
976 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
977 v.val |= SOF_TIMESTAMPING_SOFTWARE;
978 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
979 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
980 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
981 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
982 break;
983
e71a4783 984 case SO_RCVTIMEO:
2a91525c 985 lv = sizeof(struct timeval);
e71a4783
SH		 986 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
987 v.tm.tv_sec = 0;
988 v.tm.tv_usec = 0;
989 } else {
990 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
991 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
992 }
993 break;
994
995 case SO_SNDTIMEO:
2a91525c 996 lv = sizeof(struct timeval);
e71a4783
SH		 997 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
998 v.tm.tv_sec = 0;
999 v.tm.tv_usec = 0;
1000 } else {
1001 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1002 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1003 }
1004 break;
1da177e4 1005
e71a4783
SH		 1006 case SO_RCVLOWAT:
1007 v.val = sk->sk_rcvlowat;
1008 break;
1da177e4 1009
e71a4783 1010 case SO_SNDLOWAT:
2a91525c 1011 v.val = 1;
e71a4783 1012 break;
1da177e4 1013
e71a4783 1014 case SO_PASSCRED:
82981930 1015 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1016 break;
1da177e4 1017
e71a4783 1018 case SO_PEERCRED:
109f6e39
EB		 1019 {
1020 struct ucred peercred;
1021 if (len > sizeof(peercred))
1022 len = sizeof(peercred);
1023 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1024 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1025 return -EFAULT;
1026 goto lenout;
109f6e39 1027 }
1da177e4 1028
e71a4783
SH		 1029 case SO_PEERNAME:
1030 {
1031 char address[128];
1032
1033 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1034 return -ENOTCONN;
1035 if (lv < len)
1036 return -EINVAL;
1037 if (copy_to_user(optval, address, len))
1038 return -EFAULT;
1039 goto lenout;
1040 }
1da177e4 1041
e71a4783
SH		 1042 /* Dubious BSD thing... Probably nobody even uses it, but
1043 * the UNIX standard wants it for whatever reason... -DaveM
1044 */
1045 case SO_ACCEPTCONN:
1046 v.val = sk->sk_state == TCP_LISTEN;
1047 break;
1da177e4 1048
e71a4783 1049 case SO_PASSSEC:
82981930 1050 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1051 break;
877ce7c1 1052
e71a4783
SH		 1053 case SO_PEERSEC:
1054 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1055
4a19ec58
LAT		 1056 case SO_MARK:
1057 v.val = sk->sk_mark;
1058 break;
1059
3b885787 1060 case SO_RXQ_OVFL:
1b23a5df 1061 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1062 break;
1063
6e3e939f 1064 case SO_WIFI_STATUS:
1b23a5df 1065 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1066 break;
1067
ef64a54f
PE		 1068 case SO_PEEK_OFF:
1069 if (!sock->ops->set_peek_off)
1070 return -EOPNOTSUPP;
1071
1072 v.val = sk->sk_peek_off;
1073 break;
bc2f7996 1074 case SO_NOFCS:
1b23a5df 1075 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1076 break;
e71a4783
SH		 1077 default:
1078 return -ENOPROTOOPT;
1da177e4 1079 }
e71a4783 1080
1da177e4
LT		 1081 if (len > lv)
1082 len = lv;
1083 if (copy_to_user(optval, &v, len))
1084 return -EFAULT;
1085lenout:
4ec93edb
YH		 1086 if (put_user(len, optlen))
1087 return -EFAULT;
1088 return 0;
1da177e4
LT		 1089}
1090
a5b5bb9a
IM		 1091/*
1092 * Initialize an sk_lock.
1093 *
1094 * (We also register the sk_lock with the lock validator.)
1095 */
b6f99a21 1096static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1097{
ed07536e
PZ		 1098 sock_lock_init_class_and_name(sk,
1099 af_family_slock_key_strings[sk->sk_family],
1100 af_family_slock_keys + sk->sk_family,
1101 af_family_key_strings[sk->sk_family],
1102 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1103}
1104
4dc6dc71
ED		 1105/*
1106 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1107 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1108 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1109 */
f1a6c4da
PE		 1110static void sock_copy(struct sock *nsk, const struct sock *osk)
1111{
1112#ifdef CONFIG_SECURITY_NETWORK
1113 void *sptr = nsk->sk_security;
1114#endif
68835aba
ED		 1115 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1116
1117 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1118 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1119
f1a6c4da
PE		 1120#ifdef CONFIG_SECURITY_NETWORK
1121 nsk->sk_security = sptr;
1122 security_sk_clone(osk, nsk);
1123#endif
1124}
1125
fcbdf09d
OP		 1126/*
1127 * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes
1128 * un-modified. Special care is taken when initializing object to zero.
1129 */
1130static inline void sk_prot_clear_nulls(struct sock *sk, int size)
1131{
1132 if (offsetof(struct sock, sk_node.next) != 0)
1133 memset(sk, 0, offsetof(struct sock, sk_node.next));
1134 memset(&sk->sk_node.pprev, 0,
1135 size - offsetof(struct sock, sk_node.pprev));
1136}
1137
1138void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1139{
1140 unsigned long nulls1, nulls2;
1141
1142 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1143 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1144 if (nulls1 > nulls2)
1145 swap(nulls1, nulls2);
1146
1147 if (nulls1 != 0)
1148 memset((char *)sk, 0, nulls1);
1149 memset((char *)sk + nulls1 + sizeof(void *), 0,
1150 nulls2 - nulls1 - sizeof(void *));
1151 memset((char *)sk + nulls2 + sizeof(void *), 0,
1152 size - nulls2 - sizeof(void *));
1153}
1154EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1155
2e4afe7b
PE		 1156static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1157 int family)
c308c1b2
PE		 1158{
1159 struct sock *sk;
1160 struct kmem_cache *slab;
1161
1162 slab = prot->slab;
e912b114
ED		 1163 if (slab != NULL) {
1164 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1165 if (!sk)
1166 return sk;
1167 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1168 if (prot->clear_sk)
1169 prot->clear_sk(sk, prot->obj_size);
1170 else
1171 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1172 }
fcbdf09d 1173 } else
c308c1b2
PE		 1174 sk = kmalloc(prot->obj_size, priority);
1175
2e4afe7b 1176 if (sk != NULL) {
a98b65a3
VN		 1177 kmemcheck_annotate_bitfield(sk, flags);
1178
2e4afe7b
PE		 1179 if (security_sk_alloc(sk, family, priority))
1180 goto out_free;
1181
1182 if (!try_module_get(prot->owner))
1183 goto out_free_sec;
e022f0b4 1184 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1185 }
1186
c308c1b2 1187 return sk;
2e4afe7b
PE		 1188
1189out_free_sec:
1190 security_sk_free(sk);
1191out_free:
1192 if (slab != NULL)
1193 kmem_cache_free(slab, sk);
1194 else
1195 kfree(sk);
1196 return NULL;
c308c1b2
PE		 1197}
1198
1199static void sk_prot_free(struct proto *prot, struct sock *sk)
1200{
1201 struct kmem_cache *slab;
2e4afe7b 1202 struct module *owner;
c308c1b2 1203
2e4afe7b 1204 owner = prot->owner;
c308c1b2 1205 slab = prot->slab;
2e4afe7b
PE		 1206
1207 security_sk_free(sk);
c308c1b2
PE		 1208 if (slab != NULL)
1209 kmem_cache_free(slab, sk);
1210 else
1211 kfree(sk);
2e4afe7b 1212 module_put(owner);
c308c1b2
PE		 1213}
1214
f8451725 1215#ifdef CONFIG_CGROUPS
8fb974c9 1216#if IS_ENABLED(CONFIG_NET_CLS_CGROUP)
f8451725
HX		 1217void sock_update_classid(struct sock *sk)
1218{
1144182a 1219 u32 classid;
f8451725 1220
1144182a
PM		 1221 rcu_read_lock(); /* doing current task, which cannot vanish. */
1222 classid = task_cls_classid(current);
1223 rcu_read_unlock();
3afa6d00 1224 if (classid != sk->sk_classid)
f8451725
HX		 1225 sk->sk_classid = classid;
1226}
82862742 1227EXPORT_SYMBOL(sock_update_classid);
8fb974c9 1228#endif
5bc1421e 1229
51e4e7fa 1230#if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
406a3c63 1231void sock_update_netprioidx(struct sock *sk, struct task_struct *task)
5bc1421e 1232{
5bc1421e
NH		 1233 if (in_interrupt())
1234 return;
2b73bc65 1235
406a3c63 1236 sk->sk_cgrp_prioidx = task_netprioidx(task);
5bc1421e
NH		 1237}
1238EXPORT_SYMBOL_GPL(sock_update_netprioidx);
f8451725 1239#endif
51e4e7fa 1240#endif
f8451725 1241
1da177e4
LT		 1242/**
1243 * sk_alloc - All socket objects are allocated here
c4ea43c5 1244 * @net: the applicable net namespace
4dc3b16b
PP		 1245 * @family: protocol family
1246 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1247 * @prot: struct proto associated with this new sock instance
1da177e4 1248 */
1b8d7ae4 1249struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1250 struct proto *prot)
1da177e4 1251{
c308c1b2 1252 struct sock *sk;
1da177e4 1253
154adbc8 1254 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1255 if (sk) {
154adbc8
PE		 1256 sk->sk_family = family;
1257 /*
1258 * See comment in struct sock definition to understand
1259 * why we need sk_prot_creator -acme
1260 */
1261 sk->sk_prot = sk->sk_prot_creator = prot;
1262 sock_lock_init(sk);
3b1e0a65 1263 sock_net_set(sk, get_net(net));
d66ee058 1264 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725
HX		 1265
1266 sock_update_classid(sk);
406a3c63 1267 sock_update_netprioidx(sk, current);
1da177e4 1268 }
a79af59e 1269
2e4afe7b 1270 return sk;
1da177e4 1271}
2a91525c 1272EXPORT_SYMBOL(sk_alloc);
1da177e4 1273
2b85a34e 1274static void __sk_free(struct sock *sk)
1da177e4
LT		 1275{
1276 struct sk_filter *filter;
1da177e4
LT		 1277
1278 if (sk->sk_destruct)
1279 sk->sk_destruct(sk);
1280
a898def2
PM		 1281 filter = rcu_dereference_check(sk->sk_filter,
1282 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1283 if (filter) {
309dd5fc 1284 sk_filter_uncharge(sk, filter);
a9b3cd7f 1285 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1286 }
1287
08e29af3 1288 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1289
1290 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1291 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1292 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1293
109f6e39
EB		 1294 if (sk->sk_peer_cred)
1295 put_cred(sk->sk_peer_cred);
1296 put_pid(sk->sk_peer_pid);
3b1e0a65 1297 put_net(sock_net(sk));
c308c1b2 1298 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1299}
2b85a34e
ED		 1300
1301void sk_free(struct sock *sk)
1302{
1303 /*
25985edc 1304 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1305 * some packets are still in some tx queue.
1306 * If not null, sock_wfree() will call __sk_free(sk) later
1307 */
1308 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1309 __sk_free(sk);
1310}
2a91525c 1311EXPORT_SYMBOL(sk_free);
1da177e4 1312
edf02087 1313/*
25985edc
LDM		 1314 * Last sock_put should drop reference to sk->sk_net. It has already
1315 * been dropped in sk_change_net. Taking reference to stopping namespace
edf02087 1316 * is not an option.
25985edc 1317 * Take reference to a socket to remove it from hash _alive_ and after that
edf02087
DL		 1318 * destroy it in the context of init_net.
1319 */
1320void sk_release_kernel(struct sock *sk)
1321{
1322 if (sk == NULL || sk->sk_socket == NULL)
1323 return;
1324
1325 sock_hold(sk);
1326 sock_release(sk->sk_socket);
65a18ec5 1327 release_net(sock_net(sk));
3b1e0a65 1328 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1329 sock_put(sk);
1330}
45af1754 1331EXPORT_SYMBOL(sk_release_kernel);
edf02087 1332
475f1b52
SR		 1333static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1334{
1335 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1336 sock_update_memcg(newsk);
1337}
1338
e56c57d0
ED		 1339/**
1340 * sk_clone_lock - clone a socket, and lock its clone
1341 * @sk: the socket to clone
1342 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1343 *
1344 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1345 */
1346struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1347{
8fd1d178 1348 struct sock *newsk;
87d11ceb 1349
8fd1d178 1350 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1351 if (newsk != NULL) {
1352 struct sk_filter *filter;
1353
892c141e 1354 sock_copy(newsk, sk);
87d11ceb
ACM		 1355
1356 /* SANITY */
3b1e0a65 1357 get_net(sock_net(newsk));
87d11ceb
ACM		 1358 sk_node_init(&newsk->sk_node);
1359 sock_lock_init(newsk);
1360 bh_lock_sock(newsk);
fa438ccf 1361 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1362 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1363
1364 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1365 /*
1366 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1367 */
1368 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1369 atomic_set(&newsk->sk_omem_alloc, 0);
1370 skb_queue_head_init(&newsk->sk_receive_queue);
1371 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1372#ifdef CONFIG_NET_DMA
1373 skb_queue_head_init(&newsk->sk_async_wait_queue);
1374#endif
87d11ceb 1375
b6c6712a 1376 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1377 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1378 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1379 af_callback_keys + newsk->sk_family,
1380 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1381
1382 newsk->sk_dst_cache = NULL;
1383 newsk->sk_wmem_queued = 0;
1384 newsk->sk_forward_alloc = 0;
1385 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1386 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1387
1388 sock_reset_flag(newsk, SOCK_DONE);
1389 skb_queue_head_init(&newsk->sk_error_queue);
1390
0d7da9dd 1391 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb
ACM		 1392 if (filter != NULL)
1393 sk_filter_charge(newsk, filter);
1394
1395 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1396 /* It is still raw copy of parent, so invalidate
1397 * destructor and make plain sk_free() */
1398 newsk->sk_destruct = NULL;
b0691c8e 1399 bh_unlock_sock(newsk);
87d11ceb
ACM		 1400 sk_free(newsk);
1401 newsk = NULL;
1402 goto out;
1403 }
1404
1405 newsk->sk_err = 0;
1406 newsk->sk_priority = 0;
4dc6dc71
ED		 1407 /*
1408 * Before updating sk_refcnt, we must commit prior changes to memory
1409 * (Documentation/RCU/rculist_nulls.txt for details)
1410 */
1411 smp_wmb();
87d11ceb
ACM		 1412 atomic_set(&newsk->sk_refcnt, 2);
1413
1414 /*
1415 * Increment the counter in the same struct proto as the master
1416 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1417 * is the same as sk->sk_prot->socks, as this field was copied
1418 * with memcpy).
1419 *
1420 * This _changes_ the previous behaviour, where
1421 * tcp_create_openreq_child always was incrementing the
1422 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1423 * to be taken into account in all callers. -acme
1424 */
1425 sk_refcnt_debug_inc(newsk);
972692e0 1426 sk_set_socket(newsk, NULL);
43815482 1427 newsk->sk_wq = NULL;
87d11ceb 1428
f3f511e1
GC		 1429 sk_update_clone(sk, newsk);
1430
87d11ceb 1431 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1432 sk_sockets_allocated_inc(newsk);
704da560 1433
08e29af3 1434 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1435 net_enable_timestamp();
87d11ceb
ACM		 1436 }
1437out:
1438 return newsk;
1439}
e56c57d0 1440EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1441
9958089a
AK		 1442void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1443{
1444 __sk_dst_set(sk, dst);
1445 sk->sk_route_caps = dst->dev->features;
1446 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1447 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1448 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1449 if (sk_can_gso(sk)) {
82cc1a7a 1450 if (dst->header_len) {
9958089a 1451 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1452 } else {
9958089a 1453 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1454 sk->sk_gso_max_size = dst->dev->gso_max_size;
1485348d 1455 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
82cc1a7a 1456 }
9958089a
AK		 1457 }
1458}
1459EXPORT_SYMBOL_GPL(sk_setup_caps);
1460
1da177e4
LT		 1461/*
1462 * Simple resource managers for sockets.
1463 */
1464
1465
4ec93edb
YH		 1466/*
1467 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1468 */
1469void sock_wfree(struct sk_buff *skb)
1470{
1471 struct sock *sk = skb->sk;
d99927f4 1472 unsigned int len = skb->truesize;
1da177e4 1473
d99927f4
ED		 1474 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1475 /*
1476 * Keep a reference on sk_wmem_alloc, this will be released
1477 * after sk_write_space() call
1478 */
1479 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1480 sk->sk_write_space(sk);
d99927f4
ED		 1481 len = 1;
1482 }
2b85a34e 1483 /*
d99927f4
ED		 1484 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1485 * could not do because of in-flight packets
2b85a34e 1486 */
d99927f4 1487 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1488 __sk_free(sk);
1da177e4 1489}
2a91525c 1490EXPORT_SYMBOL(sock_wfree);
1da177e4 1491
4ec93edb
YH		 1492/*
1493 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1494 */
1495void sock_rfree(struct sk_buff *skb)
1496{
1497 struct sock *sk = skb->sk;
d361fd59 1498 unsigned int len = skb->truesize;
1da177e4 1499
d361fd59
ED		 1500 atomic_sub(len, &sk->sk_rmem_alloc);
1501 sk_mem_uncharge(sk, len);
1da177e4 1502}
2a91525c 1503EXPORT_SYMBOL(sock_rfree);
1da177e4 1504
41063e9d
DM		 1505void sock_edemux(struct sk_buff *skb)
1506{
e812347c
ED		 1507 struct sock *sk = skb->sk;
1508
1c463e57 1509#ifdef CONFIG_INET
e812347c
ED		 1510 if (sk->sk_state == TCP_TIME_WAIT)
1511 inet_twsk_put(inet_twsk(sk));
1512 else
1c463e57 1513#endif
e812347c 1514 sock_put(sk);
41063e9d
DM		 1515}
1516EXPORT_SYMBOL(sock_edemux);
1da177e4 1517
976d0201 1518kuid_t sock_i_uid(struct sock *sk)
1da177e4 1519{
976d0201 1520 kuid_t uid;
1da177e4 1521
f064af1e 1522 read_lock_bh(&sk->sk_callback_lock);
976d0201 1523 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1524 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1525 return uid;
1526}
2a91525c 1527EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1528
1529unsigned long sock_i_ino(struct sock *sk)
1530{
1531 unsigned long ino;
1532
f064af1e 1533 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1534 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1535 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1536 return ino;
1537}
2a91525c 1538EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1539
1540/*
1541 * Allocate a skb from the socket's send buffer.
1542 */
86a76caf 1543struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1544 gfp_t priority)
1da177e4
LT		 1545{
1546 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1547 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1548 if (skb) {
1549 skb_set_owner_w(skb, sk);
1550 return skb;
1551 }
1552 }
1553 return NULL;
1554}
2a91525c 1555EXPORT_SYMBOL(sock_wmalloc);
1da177e4
LT		 1556
1557/*
1558 * Allocate a skb from the socket's receive buffer.
4ec93edb 1559 */
86a76caf 1560struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1561 gfp_t priority)
1da177e4
LT		 1562{
1563 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1564 struct sk_buff *skb = alloc_skb(size, priority);
1565 if (skb) {
1566 skb_set_owner_r(skb, sk);
1567 return skb;
1568 }
1569 }
1570 return NULL;
1571}
1572
4ec93edb 1573/*
1da177e4 1574 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1575 */
dd0fc66f 1576void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1577{
95c96174 1578 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1579 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1580 void *mem;
1581 /* First do the add, to avoid the race if kmalloc
4ec93edb 1582 * might sleep.
1da177e4
LT		 1583 */
1584 atomic_add(size, &sk->sk_omem_alloc);
1585 mem = kmalloc(size, priority);
1586 if (mem)
1587 return mem;
1588 atomic_sub(size, &sk->sk_omem_alloc);
1589 }
1590 return NULL;
1591}
2a91525c 1592EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1593
1594/*
1595 * Free an option memory block.
1596 */
1597void sock_kfree_s(struct sock *sk, void *mem, int size)
1598{
1599 kfree(mem);
1600 atomic_sub(size, &sk->sk_omem_alloc);
1601}
2a91525c 1602EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1603
1604/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1605 I think, these locks should be removed for datagram sockets.
1606 */
2a91525c 1607static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1608{
1609 DEFINE_WAIT(wait);
1610
1611 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1612 for (;;) {
1613 if (!timeo)
1614 break;
1615 if (signal_pending(current))
1616 break;
1617 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1618 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1619 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1620 break;
1621 if (sk->sk_shutdown & SEND_SHUTDOWN)
1622 break;
1623 if (sk->sk_err)
1624 break;
1625 timeo = schedule_timeout(timeo);
1626 }
aa395145 1627 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1628 return timeo;
1629}
1630
1631
1632/*
1633 * Generic send/receive buffer handlers
1634 */
1635
4cc7f68d
HX		 1636struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1637 unsigned long data_len, int noblock,
1638 int *errcode)
1da177e4
LT		 1639{
1640 struct sk_buff *skb;
7d877f3b 1641 gfp_t gfp_mask;
1da177e4
LT		 1642 long timeo;
1643 int err;
cc9b17ad
JW		 1644 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1645
1646 err = -EMSGSIZE;
1647 if (npages > MAX_SKB_FRAGS)
1648 goto failure;
1da177e4
LT		 1649
1650 gfp_mask = sk->sk_allocation;
1651 if (gfp_mask & __GFP_WAIT)
1652 gfp_mask |= __GFP_REPEAT;
1653
1654 timeo = sock_sndtimeo(sk, noblock);
1655 while (1) {
1656 err = sock_error(sk);
1657 if (err != 0)
1658 goto failure;
1659
1660 err = -EPIPE;
1661 if (sk->sk_shutdown & SEND_SHUTDOWN)
1662 goto failure;
1663
1664 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1665 skb = alloc_skb(header_len, gfp_mask);
1da177e4 1666 if (skb) {
1da177e4
LT		 1667 int i;
1668
1669 /* No pages, we're done... */
1670 if (!data_len)
1671 break;
1672
1da177e4
LT		 1673 skb->truesize += data_len;
1674 skb_shinfo(skb)->nr_frags = npages;
1675 for (i = 0; i < npages; i++) {
1676 struct page *page;
1da177e4
LT		 1677
1678 page = alloc_pages(sk->sk_allocation, 0);
1679 if (!page) {
1680 err = -ENOBUFS;
1681 skb_shinfo(skb)->nr_frags = i;
1682 kfree_skb(skb);
1683 goto failure;
1684 }
1685
ea2ab693
IC		 1686 __skb_fill_page_desc(skb, i,
1687 page, 0,
1688 (data_len >= PAGE_SIZE ?
1689 PAGE_SIZE :
1690 data_len));
1da177e4
LT		 1691 data_len -= PAGE_SIZE;
1692 }
1693
1694 /* Full success... */
1695 break;
1696 }
1697 err = -ENOBUFS;
1698 goto failure;
1699 }
1700 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1701 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1702 err = -EAGAIN;
1703 if (!timeo)
1704 goto failure;
1705 if (signal_pending(current))
1706 goto interrupted;
1707 timeo = sock_wait_for_wmem(sk, timeo);
1708 }
1709
1710 skb_set_owner_w(skb, sk);
1711 return skb;
1712
1713interrupted:
1714 err = sock_intr_errno(timeo);
1715failure:
1716 *errcode = err;
1717 return NULL;
1718}
4cc7f68d 1719EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1720
4ec93edb 1721struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1722 int noblock, int *errcode)
1723{
1724 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1725}
2a91525c 1726EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1727
5640f768
ED		 1728/* On 32bit arches, an skb frag is limited to 2^15 */
1729#define SKB_FRAG_PAGE_ORDER get_order(32768)
1730
1731bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1732{
1733 int order;
1734
1735 if (pfrag->page) {
1736 if (atomic_read(&pfrag->page->_count) == 1) {
1737 pfrag->offset = 0;
1738 return true;
1739 }
1740 if (pfrag->offset < pfrag->size)
1741 return true;
1742 put_page(pfrag->page);
1743 }
1744
1745 /* We restrict high order allocations to users that can afford to wait */
1746 order = (sk->sk_allocation & __GFP_WAIT) ? SKB_FRAG_PAGE_ORDER : 0;
1747
1748 do {
1749 gfp_t gfp = sk->sk_allocation;
1750
1751 if (order)
1752 gfp |= __GFP_COMP | __GFP_NOWARN;
1753 pfrag->page = alloc_pages(gfp, order);
1754 if (likely(pfrag->page)) {
1755 pfrag->offset = 0;
1756 pfrag->size = PAGE_SIZE << order;
1757 return true;
1758 }
1759 } while (--order >= 0);
1760
1761 sk_enter_memory_pressure(sk);
1762 sk_stream_moderate_sndbuf(sk);
1763 return false;
1764}
1765EXPORT_SYMBOL(sk_page_frag_refill);
1766
1da177e4 1767static void __lock_sock(struct sock *sk)
f39234d6
NK		 1768 __releases(&sk->sk_lock.slock)
1769 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1770{
1771 DEFINE_WAIT(wait);
1772
e71a4783 1773 for (;;) {
1da177e4
LT		 1774 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1775 TASK_UNINTERRUPTIBLE);
1776 spin_unlock_bh(&sk->sk_lock.slock);
1777 schedule();
1778 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1779 if (!sock_owned_by_user(sk))
1da177e4
LT		 1780 break;
1781 }
1782 finish_wait(&sk->sk_lock.wq, &wait);
1783}
1784
1785static void __release_sock(struct sock *sk)
f39234d6
NK		 1786 __releases(&sk->sk_lock.slock)
1787 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1788{
1789 struct sk_buff *skb = sk->sk_backlog.head;
1790
1791 do {
1792 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1793 bh_unlock_sock(sk);
1794
1795 do {
1796 struct sk_buff *next = skb->next;
1797
e4cbb02a 1798 prefetch(next);
7fee226a 1799 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1800 skb->next = NULL;
c57943a1 1801 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1802
1803 /*
1804 * We are in process context here with softirqs
1805 * disabled, use cond_resched_softirq() to preempt.
1806 * This is safe to do because we've taken the backlog
1807 * queue private:
1808 */
1809 cond_resched_softirq();
1810
1811 skb = next;
1812 } while (skb != NULL);
1813
1814 bh_lock_sock(sk);
e71a4783 1815 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1816
1817 /*
1818 * Doing the zeroing here guarantee we can not loop forever
1819 * while a wild producer attempts to flood us.
1820 */
1821 sk->sk_backlog.len = 0;
1da177e4
LT		 1822}
1823
1824/**
1825 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1826 * @sk: sock to wait on
1827 * @timeo: for how long
1da177e4
LT		 1828 *
1829 * Now socket state including sk->sk_err is changed only under lock,
1830 * hence we may omit checks after joining wait queue.
1831 * We check receive queue before schedule() only as optimization;
1832 * it is very likely that release_sock() added new data.
1833 */
1834int sk_wait_data(struct sock *sk, long *timeo)
1835{
1836 int rc;
1837 DEFINE_WAIT(wait);
1838
aa395145 1839 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1840 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1841 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1842 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1843 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1844 return rc;
1845}
1da177e4
LT		 1846EXPORT_SYMBOL(sk_wait_data);
1847
3ab224be
HA		 1848/**
1849 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1850 * @sk: socket
1851 * @size: memory size to allocate
1852 * @kind: allocation type
1853 *
1854 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1855 * rmem allocation. This function assumes that protocols which have
1856 * memory_pressure use sk_wmem_queued as write buffer accounting.
1857 */
1858int __sk_mem_schedule(struct sock *sk, int size, int kind)
1859{
1860 struct proto *prot = sk->sk_prot;
1861 int amt = sk_mem_pages(size);
8d987e5c 1862 long allocated;
e1aab161 1863 int parent_status = UNDER_LIMIT;
3ab224be
HA		 1864
1865 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 1866
e1aab161 1867 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 1868
1869 /* Under limit. */
e1aab161
GC		 1870 if (parent_status == UNDER_LIMIT &&
1871 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 1872 sk_leave_memory_pressure(sk);
3ab224be
HA		 1873 return 1;
1874 }
1875
e1aab161
GC		 1876 /* Under pressure. (we or our parents) */
1877 if ((parent_status > SOFT_LIMIT) ||
1878 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 1879 sk_enter_memory_pressure(sk);
3ab224be 1880
e1aab161
GC		 1881 /* Over hard limit (we or our parents) */
1882 if ((parent_status == OVER_LIMIT) ||
1883 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 1884 goto suppress_allocation;
1885
1886 /* guarantee minimum buffer size under pressure */
1887 if (kind == SK_MEM_RECV) {
1888 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1889 return 1;
180d8cd9 1890
3ab224be
HA		 1891 } else { /* SK_MEM_SEND */
1892 if (sk->sk_type == SOCK_STREAM) {
1893 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1894 return 1;
1895 } else if (atomic_read(&sk->sk_wmem_alloc) <
1896 prot->sysctl_wmem[0])
1897 return 1;
1898 }
1899
180d8cd9 1900 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 1901 int alloc;
1902
180d8cd9 1903 if (!sk_under_memory_pressure(sk))
1748376b 1904 return 1;
180d8cd9
GC		 1905 alloc = sk_sockets_allocated_read_positive(sk);
1906 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 1907 sk_mem_pages(sk->sk_wmem_queued +
1908 atomic_read(&sk->sk_rmem_alloc) +
1909 sk->sk_forward_alloc))
1910 return 1;
1911 }
1912
1913suppress_allocation:
1914
1915 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1916 sk_stream_moderate_sndbuf(sk);
1917
1918 /* Fail only if socket is _under_ its sndbuf.
1919 * In this case we cannot block, so that we have to fail.
1920 */
1921 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1922 return 1;
1923 }
1924
3847ce32
SM		 1925 trace_sock_exceed_buf_limit(sk, prot, allocated);
1926
3ab224be
HA		 1927 /* Alas. Undo changes. */
1928 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 1929
0e90b31f 1930 sk_memory_allocated_sub(sk, amt);
180d8cd9 1931
3ab224be
HA		 1932 return 0;
1933}
3ab224be
HA		 1934EXPORT_SYMBOL(__sk_mem_schedule);
1935
1936/**
1937 * __sk_reclaim - reclaim memory_allocated
1938 * @sk: socket
1939 */
1940void __sk_mem_reclaim(struct sock *sk)
1941{
180d8cd9 1942 sk_memory_allocated_sub(sk,
0e90b31f 1943 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
3ab224be
HA		 1944 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1945
180d8cd9
GC		 1946 if (sk_under_memory_pressure(sk) &&
1947 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
1948 sk_leave_memory_pressure(sk);
3ab224be 1949}
3ab224be
HA		 1950EXPORT_SYMBOL(__sk_mem_reclaim);
1951
1952
1da177e4
LT		 1953/*
1954 * Set of default routines for initialising struct proto_ops when
1955 * the protocol does not support a particular function. In certain
1956 * cases where it makes no sense for a protocol to have a "do nothing"
1957 * function, some default processing is provided.
1958 */
1959
1960int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1961{
1962 return -EOPNOTSUPP;
1963}
2a91525c 1964EXPORT_SYMBOL(sock_no_bind);
1da177e4 1965
4ec93edb 1966int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1967 int len, int flags)
1968{
1969 return -EOPNOTSUPP;
1970}
2a91525c 1971EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 1972
1973int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1974{
1975 return -EOPNOTSUPP;
1976}
2a91525c 1977EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 1978
1979int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1980{
1981 return -EOPNOTSUPP;
1982}
2a91525c 1983EXPORT_SYMBOL(sock_no_accept);
1da177e4 1984
4ec93edb 1985int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1986 int *len, int peer)
1987{
1988 return -EOPNOTSUPP;
1989}
2a91525c 1990EXPORT_SYMBOL(sock_no_getname);
1da177e4 1991
2a91525c 1992unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 1993{
1994 return 0;
1995}
2a91525c 1996EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 1997
1998int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1999{
2000 return -EOPNOTSUPP;
2001}
2a91525c 2002EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2003
2004int sock_no_listen(struct socket *sock, int backlog)
2005{
2006 return -EOPNOTSUPP;
2007}
2a91525c 2008EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2009
2010int sock_no_shutdown(struct socket *sock, int how)
2011{
2012 return -EOPNOTSUPP;
2013}
2a91525c 2014EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2015
2016int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2017 char __user *optval, unsigned int optlen)
1da177e4
LT		 2018{
2019 return -EOPNOTSUPP;
2020}
2a91525c 2021EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2022
2023int sock_no_getsockopt(struct socket *sock, int level, int optname,
2024 char __user *optval, int __user *optlen)
2025{
2026 return -EOPNOTSUPP;
2027}
2a91525c 2028EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 2029
2030int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2031 size_t len)
2032{
2033 return -EOPNOTSUPP;
2034}
2a91525c 2035EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 2036
2037int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2038 size_t len, int flags)
2039{
2040 return -EOPNOTSUPP;
2041}
2a91525c 2042EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2043
2044int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2045{
2046 /* Mirror missing mmap method error code */
2047 return -ENODEV;
2048}
2a91525c 2049EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2050
2051ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2052{
2053 ssize_t res;
2054 struct msghdr msg = {.msg_flags = flags};
2055 struct kvec iov;
2056 char *kaddr = kmap(page);
2057 iov.iov_base = kaddr + offset;
2058 iov.iov_len = size;
2059 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2060 kunmap(page);
2061 return res;
2062}
2a91525c 2063EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2064
2065/*
2066 * Default Socket Callbacks
2067 */
2068
2069static void sock_def_wakeup(struct sock *sk)
2070{
43815482
ED		 2071 struct socket_wq *wq;
2072
2073 rcu_read_lock();
2074 wq = rcu_dereference(sk->sk_wq);
2075 if (wq_has_sleeper(wq))
2076 wake_up_interruptible_all(&wq->wait);
2077 rcu_read_unlock();
1da177e4
LT		 2078}
2079
2080static void sock_def_error_report(struct sock *sk)
2081{
43815482
ED		 2082 struct socket_wq *wq;
2083
2084 rcu_read_lock();
2085 wq = rcu_dereference(sk->sk_wq);
2086 if (wq_has_sleeper(wq))
2087 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2088 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2089 rcu_read_unlock();
1da177e4
LT		 2090}
2091
2092static void sock_def_readable(struct sock *sk, int len)
2093{
43815482
ED		 2094 struct socket_wq *wq;
2095
2096 rcu_read_lock();
2097 wq = rcu_dereference(sk->sk_wq);
2098 if (wq_has_sleeper(wq))
2c6607c6 2099 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2100 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2101 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2102 rcu_read_unlock();
1da177e4
LT		 2103}
2104
2105static void sock_def_write_space(struct sock *sk)
2106{
43815482
ED		 2107 struct socket_wq *wq;
2108
2109 rcu_read_lock();
1da177e4
LT		 2110
2111 /* Do not wake up a writer until he can make "significant"
2112 * progress. --DaveM
2113 */
e71a4783 2114 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2115 wq = rcu_dereference(sk->sk_wq);
2116 if (wq_has_sleeper(wq))
2117 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2118 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2119
2120 /* Should agree with poll, otherwise some programs break */
2121 if (sock_writeable(sk))
8d8ad9d7 2122 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2123 }
2124
43815482 2125 rcu_read_unlock();
1da177e4
LT		 2126}
2127
2128static void sock_def_destruct(struct sock *sk)
2129{
a51482bd 2130 kfree(sk->sk_protinfo);
1da177e4
LT		 2131}
2132
2133void sk_send_sigurg(struct sock *sk)
2134{
2135 if (sk->sk_socket && sk->sk_socket->file)
2136 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2137 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2138}
2a91525c 2139EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2140
2141void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2142 unsigned long expires)
2143{
2144 if (!mod_timer(timer, expires))
2145 sock_hold(sk);
2146}
1da177e4
LT		 2147EXPORT_SYMBOL(sk_reset_timer);
2148
2149void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2150{
2151 if (timer_pending(timer) && del_timer(timer))
2152 __sock_put(sk);
2153}
1da177e4
LT		 2154EXPORT_SYMBOL(sk_stop_timer);
2155
2156void sock_init_data(struct socket *sock, struct sock *sk)
2157{
2158 skb_queue_head_init(&sk->sk_receive_queue);
2159 skb_queue_head_init(&sk->sk_write_queue);
2160 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 2161#ifdef CONFIG_NET_DMA
2162 skb_queue_head_init(&sk->sk_async_wait_queue);
2163#endif
1da177e4
LT		 2164
2165 sk->sk_send_head = NULL;
2166
2167 init_timer(&sk->sk_timer);
4ec93edb 2168
1da177e4
LT		 2169 sk->sk_allocation = GFP_KERNEL;
2170 sk->sk_rcvbuf = sysctl_rmem_default;
2171 sk->sk_sndbuf = sysctl_wmem_default;
2172 sk->sk_state = TCP_CLOSE;
972692e0 2173 sk_set_socket(sk, sock);
1da177e4
LT		 2174
2175 sock_set_flag(sk, SOCK_ZAPPED);
2176
e71a4783 2177 if (sock) {
1da177e4 2178 sk->sk_type = sock->type;
43815482 2179 sk->sk_wq = sock->wq;
1da177e4
LT		 2180 sock->sk = sk;
2181 } else
43815482 2182 sk->sk_wq = NULL;
1da177e4 2183
b6c6712a 2184 spin_lock_init(&sk->sk_dst_lock);
1da177e4 2185 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2186 lockdep_set_class_and_name(&sk->sk_callback_lock,
2187 af_callback_keys + sk->sk_family,
2188 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2189
2190 sk->sk_state_change = sock_def_wakeup;
2191 sk->sk_data_ready = sock_def_readable;
2192 sk->sk_write_space = sock_def_write_space;
2193 sk->sk_error_report = sock_def_error_report;
2194 sk->sk_destruct = sock_def_destruct;
2195
5640f768
ED		 2196 sk->sk_frag.page = NULL;
2197 sk->sk_frag.offset = 0;
ef64a54f 2198 sk->sk_peek_off = -1;
1da177e4 2199
109f6e39
EB		 2200 sk->sk_peer_pid = NULL;
2201 sk->sk_peer_cred = NULL;
1da177e4
LT		 2202 sk->sk_write_pending = 0;
2203 sk->sk_rcvlowat = 1;
2204 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2205 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2206
f37f0afb 2207 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2208
4dc6dc71
ED		 2209 /*
2210 * Before updating sk_refcnt, we must commit prior changes to memory
2211 * (Documentation/RCU/rculist_nulls.txt for details)
2212 */
2213 smp_wmb();
1da177e4 2214 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2215 atomic_set(&sk->sk_drops, 0);
1da177e4 2216}
2a91525c 2217EXPORT_SYMBOL(sock_init_data);
1da177e4 2218
b5606c2d 2219void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2220{
2221 might_sleep();
a5b5bb9a 2222 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2223 if (sk->sk_lock.owned)
1da177e4 2224 __lock_sock(sk);
d2e9117c 2225 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2226 spin_unlock(&sk->sk_lock.slock);
2227 /*
2228 * The sk_lock has mutex_lock() semantics here:
2229 */
fcc70d5f 2230 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2231 local_bh_enable();
1da177e4 2232}
fcc70d5f 2233EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2234
b5606c2d 2235void release_sock(struct sock *sk)
1da177e4 2236{
a5b5bb9a
IM		 2237 /*
2238 * The sk_lock has mutex_unlock() semantics:
2239 */
2240 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2241
2242 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2243 if (sk->sk_backlog.tail)
2244 __release_sock(sk);
46d3ceab
ED		 2245
2246 if (sk->sk_prot->release_cb)
2247 sk->sk_prot->release_cb(sk);
2248
d2e9117c 2249 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 2250 if (waitqueue_active(&sk->sk_lock.wq))
2251 wake_up(&sk->sk_lock.wq);
2252 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2253}
2254EXPORT_SYMBOL(release_sock);
2255
8a74ad60
ED		 2256/**
2257 * lock_sock_fast - fast version of lock_sock
2258 * @sk: socket
2259 *
2260 * This version should be used for very small section, where process wont block
2261 * return false if fast path is taken
2262 * sk_lock.slock locked, owned = 0, BH disabled
2263 * return true if slow path is taken
2264 * sk_lock.slock unlocked, owned = 1, BH enabled
2265 */
2266bool lock_sock_fast(struct sock *sk)
2267{
2268 might_sleep();
2269 spin_lock_bh(&sk->sk_lock.slock);
2270
2271 if (!sk->sk_lock.owned)
2272 /*
2273 * Note : We must disable BH
2274 */
2275 return false;
2276
2277 __lock_sock(sk);
2278 sk->sk_lock.owned = 1;
2279 spin_unlock(&sk->sk_lock.slock);
2280 /*
2281 * The sk_lock has mutex_lock() semantics here:
2282 */
2283 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2284 local_bh_enable();
2285 return true;
2286}
2287EXPORT_SYMBOL(lock_sock_fast);
2288
1da177e4 2289int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2290{
b7aa0bf7 2291 struct timeval tv;
1da177e4 2292 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2293 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2294 tv = ktime_to_timeval(sk->sk_stamp);
2295 if (tv.tv_sec == -1)
1da177e4 2296 return -ENOENT;
b7aa0bf7
ED		 2297 if (tv.tv_sec == 0) {
2298 sk->sk_stamp = ktime_get_real();
2299 tv = ktime_to_timeval(sk->sk_stamp);
2300 }
2301 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2302}
1da177e4
LT		 2303EXPORT_SYMBOL(sock_get_timestamp);
2304
ae40eb1e
ED		 2305int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2306{
2307 struct timespec ts;
2308 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2309 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2310 ts = ktime_to_timespec(sk->sk_stamp);
2311 if (ts.tv_sec == -1)
2312 return -ENOENT;
2313 if (ts.tv_sec == 0) {
2314 sk->sk_stamp = ktime_get_real();
2315 ts = ktime_to_timespec(sk->sk_stamp);
2316 }
2317 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2318}
2319EXPORT_SYMBOL(sock_get_timestampns);
2320
20d49473 2321void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2322{
20d49473 2323 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2324 unsigned long previous_flags = sk->sk_flags;
2325
20d49473
PO		 2326 sock_set_flag(sk, flag);
2327 /*
2328 * we just set one of the two flags which require net
2329 * time stamping, but time stamping might have been on
2330 * already because of the other one
2331 */
08e29af3 2332 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2333 net_enable_timestamp();
1da177e4
LT		 2334 }
2335}
1da177e4
LT		 2336
2337/*
2338 * Get a socket option on an socket.
2339 *
2340 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2341 * asynchronous errors should be reported by getsockopt. We assume
2342 * this means if you specify SO_ERROR (otherwise whats the point of it).
2343 */
2344int sock_common_getsockopt(struct socket *sock, int level, int optname,
2345 char __user *optval, int __user *optlen)
2346{
2347 struct sock *sk = sock->sk;
2348
2349 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2350}
1da177e4
LT		 2351EXPORT_SYMBOL(sock_common_getsockopt);
2352
3fdadf7d 2353#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2354int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2355 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2356{
2357 struct sock *sk = sock->sk;
2358
1e51f951 2359 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2360 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2361 optval, optlen);
3fdadf7d
DM		 2362 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2363}
2364EXPORT_SYMBOL(compat_sock_common_getsockopt);
2365#endif
2366
1da177e4
LT		 2367int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2368 struct msghdr *msg, size_t size, int flags)
2369{
2370 struct sock *sk = sock->sk;
2371 int addr_len = 0;
2372 int err;
2373
2374 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2375 flags & ~MSG_DONTWAIT, &addr_len);
2376 if (err >= 0)
2377 msg->msg_namelen = addr_len;
2378 return err;
2379}
1da177e4
LT		 2380EXPORT_SYMBOL(sock_common_recvmsg);
2381
2382/*
2383 * Set socket options on an inet socket.
2384 */
2385int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2386 char __user *optval, unsigned int optlen)
1da177e4
LT		 2387{
2388 struct sock *sk = sock->sk;
2389
2390 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2391}
1da177e4
LT		 2392EXPORT_SYMBOL(sock_common_setsockopt);
2393
3fdadf7d 2394#ifdef CONFIG_COMPAT
543d9cfe 2395int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2396 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2397{
2398 struct sock *sk = sock->sk;
2399
543d9cfe
ACM		 2400 if (sk->sk_prot->compat_setsockopt != NULL)
2401 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2402 optval, optlen);
3fdadf7d
DM		 2403 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2404}
2405EXPORT_SYMBOL(compat_sock_common_setsockopt);
2406#endif
2407
1da177e4
LT		 2408void sk_common_release(struct sock *sk)
2409{
2410 if (sk->sk_prot->destroy)
2411 sk->sk_prot->destroy(sk);
2412
2413 /*
2414 * Observation: when sock_common_release is called, processes have
2415 * no access to socket. But net still has.
2416 * Step one, detach it from networking:
2417 *
2418 * A. Remove from hash tables.
2419 */
2420
2421 sk->sk_prot->unhash(sk);
2422
2423 /*
2424 * In this point socket cannot receive new packets, but it is possible
2425 * that some packets are in flight because some CPU runs receiver and
2426 * did hash table lookup before we unhashed socket. They will achieve
2427 * receive queue and will be purged by socket destructor.
2428 *
2429 * Also we still have packets pending on receive queue and probably,
2430 * our own packets waiting in device queues. sock_destroy will drain
2431 * receive queue, but transmitted packets will delay socket destruction
2432 * until the last reference will be released.
2433 */
2434
2435 sock_orphan(sk);
2436
2437 xfrm_sk_free_policy(sk);
2438
e6848976 2439 sk_refcnt_debug_release(sk);
5640f768
ED		 2440
2441 if (sk->sk_frag.page) {
2442 put_page(sk->sk_frag.page);
2443 sk->sk_frag.page = NULL;
2444 }
2445
1da177e4
LT		 2446 sock_put(sk);
2447}
1da177e4
LT		 2448EXPORT_SYMBOL(sk_common_release);
2449
13ff3d6f
PE		 2450#ifdef CONFIG_PROC_FS
2451#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2452struct prot_inuse {
2453 int val[PROTO_INUSE_NR];
2454};
13ff3d6f
PE		 2455
2456static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2457
2458#ifdef CONFIG_NET_NS
2459void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2460{
d6d9ca0f 2461 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2462}
2463EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2464
2465int sock_prot_inuse_get(struct net *net, struct proto *prot)
2466{
2467 int cpu, idx = prot->inuse_idx;
2468 int res = 0;
2469
2470 for_each_possible_cpu(cpu)
2471 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2472
2473 return res >= 0 ? res : 0;
2474}
2475EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2476
2c8c1e72 2477static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2478{
2479 net->core.inuse = alloc_percpu(struct prot_inuse);
2480 return net->core.inuse ? 0 : -ENOMEM;
2481}
2482
2c8c1e72 2483static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2484{
2485 free_percpu(net->core.inuse);
2486}
2487
2488static struct pernet_operations net_inuse_ops = {
2489 .init = sock_inuse_init_net,
2490 .exit = sock_inuse_exit_net,
2491};
2492
2493static __init int net_inuse_init(void)
2494{
2495 if (register_pernet_subsys(&net_inuse_ops))
2496 panic("Cannot initialize net inuse counters");
2497
2498 return 0;
2499}
2500
2501core_initcall(net_inuse_init);
2502#else
1338d466
PE		 2503static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2504
c29a0bc4 2505void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2506{
d6d9ca0f 2507 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2508}
2509EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2510
c29a0bc4 2511int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2512{
2513 int cpu, idx = prot->inuse_idx;
2514 int res = 0;
2515
2516 for_each_possible_cpu(cpu)
2517 res += per_cpu(prot_inuse, cpu).val[idx];
2518
2519 return res >= 0 ? res : 0;
2520}
2521EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2522#endif
13ff3d6f
PE		 2523
2524static void assign_proto_idx(struct proto *prot)
2525{
2526 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2527
2528 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2529 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2530 return;
2531 }
2532
2533 set_bit(prot->inuse_idx, proto_inuse_idx);
2534}
2535
2536static void release_proto_idx(struct proto *prot)
2537{
2538 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2539 clear_bit(prot->inuse_idx, proto_inuse_idx);
2540}
2541#else
2542static inline void assign_proto_idx(struct proto *prot)
2543{
2544}
2545
2546static inline void release_proto_idx(struct proto *prot)
2547{
2548}
2549#endif
2550
b733c007
PE		 2551int proto_register(struct proto *prot, int alloc_slab)
2552{
1da177e4
LT		 2553 if (alloc_slab) {
2554 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2555 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2556 NULL);
1da177e4
LT		 2557
2558 if (prot->slab == NULL) {
e005d193
JP		 2559 pr_crit("%s: Can't create sock SLAB cache!\n",
2560 prot->name);
60e7663d 2561 goto out;
1da177e4 2562 }
2e6599cb
ACM		 2563
2564 if (prot->rsk_prot != NULL) {
faf23422 2565 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2566 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2567 goto out_free_sock_slab;
2568
7e56b5d6 2569 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2570 prot->rsk_prot->obj_size, 0,
20c2df83 2571 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2572
2573 if (prot->rsk_prot->slab == NULL) {
e005d193
JP		 2574 pr_crit("%s: Can't create request sock SLAB cache!\n",
2575 prot->name);
2e6599cb
ACM		 2576 goto out_free_request_sock_slab_name;
2577 }
2578 }
8feaf0c0 2579
6d6ee43e 2580 if (prot->twsk_prot != NULL) {
faf23422 2581 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2582
7e56b5d6 2583 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2584 goto out_free_request_sock_slab;
2585
6d6ee43e 2586 prot->twsk_prot->twsk_slab =
7e56b5d6 2587 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2588 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2589 0,
2590 SLAB_HWCACHE_ALIGN |
2591 prot->slab_flags,
20c2df83 2592 NULL);
6d6ee43e 2593 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2594 goto out_free_timewait_sock_slab_name;
2595 }
1da177e4
LT		 2596 }
2597
36b77a52 2598 mutex_lock(&proto_list_mutex);
1da177e4 2599 list_add(&prot->node, &proto_list);
13ff3d6f 2600 assign_proto_idx(prot);
36b77a52 2601 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2602 return 0;
2603
8feaf0c0 2604out_free_timewait_sock_slab_name:
7e56b5d6 2605 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2606out_free_request_sock_slab:
2607 if (prot->rsk_prot && prot->rsk_prot->slab) {
2608 kmem_cache_destroy(prot->rsk_prot->slab);
2609 prot->rsk_prot->slab = NULL;
2610 }
2e6599cb 2611out_free_request_sock_slab_name:
72150e9b
DC		 2612 if (prot->rsk_prot)
2613 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2614out_free_sock_slab:
2615 kmem_cache_destroy(prot->slab);
2616 prot->slab = NULL;
b733c007
PE		 2617out:
2618 return -ENOBUFS;
1da177e4 2619}
1da177e4
LT		 2620EXPORT_SYMBOL(proto_register);
2621
2622void proto_unregister(struct proto *prot)
2623{
36b77a52 2624 mutex_lock(&proto_list_mutex);
13ff3d6f 2625 release_proto_idx(prot);
0a3f4358 2626 list_del(&prot->node);
36b77a52 2627 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2628
2629 if (prot->slab != NULL) {
2630 kmem_cache_destroy(prot->slab);
2631 prot->slab = NULL;
2632 }
2633
2e6599cb 2634 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2635 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2636 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2637 prot->rsk_prot->slab = NULL;
2638 }
2639
6d6ee43e 2640 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2641 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2642 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2643 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2644 }
1da177e4 2645}
1da177e4
LT		 2646EXPORT_SYMBOL(proto_unregister);
2647
2648#ifdef CONFIG_PROC_FS
1da177e4 2649static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2650 __acquires(proto_list_mutex)
1da177e4 2651{
36b77a52 2652 mutex_lock(&proto_list_mutex);
60f0438a 2653 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2654}
2655
2656static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2657{
60f0438a 2658 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2659}
2660
2661static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2662 __releases(proto_list_mutex)
1da177e4 2663{
36b77a52 2664 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2665}
2666
2667static char proto_method_implemented(const void *method)
2668{
2669 return method == NULL ? 'n' : 'y';
2670}
180d8cd9
GC		 2671static long sock_prot_memory_allocated(struct proto *proto)
2672{
cb75a36c 2673 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2674}
2675
2676static char *sock_prot_memory_pressure(struct proto *proto)
2677{
2678 return proto->memory_pressure != NULL ?
2679 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2680}
1da177e4
LT		 2681
2682static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2683{
180d8cd9 2684
8d987e5c 2685 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2686 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2687 proto->name,
2688 proto->obj_size,
14e943db 2689 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2690 sock_prot_memory_allocated(proto),
2691 sock_prot_memory_pressure(proto),
1da177e4
LT		 2692 proto->max_header,
2693 proto->slab == NULL ? "no" : "yes",
2694 module_name(proto->owner),
2695 proto_method_implemented(proto->close),
2696 proto_method_implemented(proto->connect),
2697 proto_method_implemented(proto->disconnect),
2698 proto_method_implemented(proto->accept),
2699 proto_method_implemented(proto->ioctl),
2700 proto_method_implemented(proto->init),
2701 proto_method_implemented(proto->destroy),
2702 proto_method_implemented(proto->shutdown),
2703 proto_method_implemented(proto->setsockopt),
2704 proto_method_implemented(proto->getsockopt),
2705 proto_method_implemented(proto->sendmsg),
2706 proto_method_implemented(proto->recvmsg),
2707 proto_method_implemented(proto->sendpage),
2708 proto_method_implemented(proto->bind),
2709 proto_method_implemented(proto->backlog_rcv),
2710 proto_method_implemented(proto->hash),
2711 proto_method_implemented(proto->unhash),
2712 proto_method_implemented(proto->get_port),
2713 proto_method_implemented(proto->enter_memory_pressure));
2714}
2715
2716static int proto_seq_show(struct seq_file *seq, void *v)
2717{
60f0438a 2718 if (v == &proto_list)
1da177e4
LT		 2719 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2720 "protocol",
2721 "size",
2722 "sockets",
2723 "memory",
2724 "press",
2725 "maxhdr",
2726 "slab",
2727 "module",
2728 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2729 else
60f0438a 2730 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2731 return 0;
2732}
2733
f690808e 2734static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2735 .start = proto_seq_start,
2736 .next = proto_seq_next,
2737 .stop = proto_seq_stop,
2738 .show = proto_seq_show,
2739};
2740
2741static int proto_seq_open(struct inode *inode, struct file *file)
2742{
14e943db
ED		 2743 return seq_open_net(inode, file, &proto_seq_ops,
2744 sizeof(struct seq_net_private));
1da177e4
LT		 2745}
2746
9a32144e 2747static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2748 .owner = THIS_MODULE,
2749 .open = proto_seq_open,
2750 .read = seq_read,
2751 .llseek = seq_lseek,
14e943db
ED		 2752 .release = seq_release_net,
2753};
2754
2755static __net_init int proto_init_net(struct net *net)
2756{
2757 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2758 return -ENOMEM;
2759
2760 return 0;
2761}
2762
2763static __net_exit void proto_exit_net(struct net *net)
2764{
2765 proc_net_remove(net, "protocols");
2766}
2767
2768
2769static __net_initdata struct pernet_operations proto_net_ops = {
2770 .init = proto_init_net,
2771 .exit = proto_exit_net,
1da177e4
LT		 2772};
2773
2774static int __init proto_init(void)
2775{
14e943db 2776 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2777}
2778
2779subsys_initcall(proto_init);
2780
2781#endif /* PROC_FS */
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