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af_unix: improve STREAM behavior with fragmented memory
[linux-2.6-block.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 95#include <linux/errno.h>
cb820f8e 96#include <linux/errqueue.h>
1da177e4
LT		 97#include <linux/types.h>
98#include <linux/socket.h>
99#include <linux/in.h>
100#include <linux/kernel.h>
1da177e4
LT		 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>
a1f8e7f7 115#include <linux/highmem.h>
3f551f94 116#include <linux/user_namespace.h>
c5905afb 117#include <linux/static_key.h>
3969eb38 118#include <linux/memcontrol.h>
8c1ae10d 119#include <linux/prefetch.h>
1da177e4
LT		 120
121#include <asm/uaccess.h>
1da177e4
LT		 122
123#include <linux/netdevice.h>
124#include <net/protocol.h>
125#include <linux/skbuff.h>
457c4cbc 126#include <net/net_namespace.h>
2e6599cb 127#include <net/request_sock.h>
1da177e4 128#include <net/sock.h>
20d49473 129#include <linux/net_tstamp.h>
1da177e4
LT		 130#include <net/xfrm.h>
131#include <linux/ipsec.h>
f8451725 132#include <net/cls_cgroup.h>
5bc1421e 133#include <net/netprio_cgroup.h>
1da177e4
LT		 134
135#include <linux/filter.h>
136
3847ce32
SM		 137#include <trace/events/sock.h>
138
1da177e4
LT		 139#ifdef CONFIG_INET
140#include <net/tcp.h>
141#endif
142
076bb0c8 143#include <net/busy_poll.h>
06021292 144
36b77a52 145static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 146static LIST_HEAD(proto_list);
147
c255a458 148#ifdef CONFIG_MEMCG_KMEM
1d62e436 149int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
d1a4c0b3
GC		 150{
151 struct proto *proto;
152 int ret = 0;
153
36b77a52 154 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 155 list_for_each_entry(proto, &proto_list, node) {
156 if (proto->init_cgroup) {
1d62e436 157 ret = proto->init_cgroup(memcg, ss);
d1a4c0b3
GC		 158 if (ret)
159 goto out;
160 }
161 }
162
36b77a52 163 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 164 return ret;
165out:
166 list_for_each_entry_continue_reverse(proto, &proto_list, node)
167 if (proto->destroy_cgroup)
1d62e436 168 proto->destroy_cgroup(memcg);
36b77a52 169 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 170 return ret;
171}
172
1d62e436 173void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
d1a4c0b3
GC		 174{
175 struct proto *proto;
176
36b77a52 177 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 178 list_for_each_entry_reverse(proto, &proto_list, node)
179 if (proto->destroy_cgroup)
1d62e436 180 proto->destroy_cgroup(memcg);
36b77a52 181 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 182}
183#endif
184
da21f24d
IM		 185/*
186 * Each address family might have different locking rules, so we have
187 * one slock key per address family:
188 */
a5b5bb9a
IM		 189static struct lock_class_key af_family_keys[AF_MAX];
190static struct lock_class_key af_family_slock_keys[AF_MAX];
191
cbda4eaf 192#if defined(CONFIG_MEMCG_KMEM)
c5905afb 193struct static_key memcg_socket_limit_enabled;
e1aab161 194EXPORT_SYMBOL(memcg_socket_limit_enabled);
cbda4eaf 195#endif
e1aab161 196
a5b5bb9a
IM		 197/*
198 * Make lock validator output more readable. (we pre-construct these
199 * strings build-time, so that runtime initialization of socket
200 * locks is fast):
201 */
36cbd3dc 202static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 203 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
204 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
205 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
206 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
207 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
208 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
209 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 210 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 211 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 212 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 213 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 214 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 215 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
456db6a4 216 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX"
a5b5bb9a 217};
36cbd3dc 218static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 219 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
220 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
221 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
222 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
223 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
224 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
225 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 226 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 227 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 228 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 229 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 230 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 231 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
456db6a4 232 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX"
a5b5bb9a 233};
36cbd3dc 234static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 235 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
236 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
237 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
238 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
239 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
240 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
241 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 242 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 243 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 244 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 245 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 246 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 247 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
456db6a4 248 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX"
443aef0e 249};
da21f24d
IM		 250
251/*
252 * sk_callback_lock locking rules are per-address-family,
253 * so split the lock classes by using a per-AF key:
254 */
255static struct lock_class_key af_callback_keys[AF_MAX];
256
1da177e4
LT		 257/* Take into consideration the size of the struct sk_buff overhead in the
258 * determination of these values, since that is non-constant across
259 * platforms. This makes socket queueing behavior and performance
260 * not depend upon such differences.
261 */
262#define _SK_MEM_PACKETS 256
87fb4b7b 263#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 264#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
265#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
266
267/* Run time adjustable parameters. */
ab32ea5d 268__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 269EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 270__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 271EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 272__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
273__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 274
25985edc 275/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 276int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 277EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 278
c93bdd0e
MG		 279struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
280EXPORT_SYMBOL_GPL(memalloc_socks);
281
7cb02404
MG		 282/**
283 * sk_set_memalloc - sets %SOCK_MEMALLOC
284 * @sk: socket to set it on
285 *
286 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
287 * It's the responsibility of the admin to adjust min_free_kbytes
288 * to meet the requirements
289 */
290void sk_set_memalloc(struct sock *sk)
291{
292 sock_set_flag(sk, SOCK_MEMALLOC);
293 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 294 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 295}
296EXPORT_SYMBOL_GPL(sk_set_memalloc);
297
298void sk_clear_memalloc(struct sock *sk)
299{
300 sock_reset_flag(sk, SOCK_MEMALLOC);
301 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 302 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 303
304 /*
305 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
306 * progress of swapping. However, if SOCK_MEMALLOC is cleared while
307 * it has rmem allocations there is a risk that the user of the
308 * socket cannot make forward progress due to exceeding the rmem
309 * limits. By rights, sk_clear_memalloc() should only be called
310 * on sockets being torn down but warn and reset the accounting if
311 * that assumption breaks.
312 */
313 if (WARN_ON(sk->sk_forward_alloc))
314 sk_mem_reclaim(sk);
7cb02404
MG		 315}
316EXPORT_SYMBOL_GPL(sk_clear_memalloc);
317
b4b9e355
MG		 318int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
319{
320 int ret;
321 unsigned long pflags = current->flags;
322
323 /* these should have been dropped before queueing */
324 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
325
326 current->flags |= PF_MEMALLOC;
327 ret = sk->sk_backlog_rcv(sk, skb);
328 tsk_restore_flags(current, pflags, PF_MEMALLOC);
329
330 return ret;
331}
332EXPORT_SYMBOL(__sk_backlog_rcv);
333
1da177e4
LT		 334static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
335{
336 struct timeval tv;
337
338 if (optlen < sizeof(tv))
339 return -EINVAL;
340 if (copy_from_user(&tv, optval, sizeof(tv)))
341 return -EFAULT;
ba78073e
VA		 342 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
343 return -EDOM;
1da177e4 344
ba78073e 345 if (tv.tv_sec < 0) {
6f11df83
AM		 346 static int warned __read_mostly;
347
ba78073e 348 *timeo_p = 0;
50aab54f 349 if (warned < 10 && net_ratelimit()) {
ba78073e 350 warned++;
e005d193
JP		 351 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
352 __func__, current->comm, task_pid_nr(current));
50aab54f 353 }
ba78073e
VA		 354 return 0;
355 }
1da177e4
LT		 356 *timeo_p = MAX_SCHEDULE_TIMEOUT;
357 if (tv.tv_sec == 0 && tv.tv_usec == 0)
358 return 0;
359 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
360 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
361 return 0;
362}
363
364static void sock_warn_obsolete_bsdism(const char *name)
365{
366 static int warned;
367 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 368 if (strcmp(warncomm, current->comm) && warned < 5) {
369 strcpy(warncomm, current->comm);
e005d193
JP		 370 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
371 warncomm, name);
1da177e4
LT		 372 warned++;
373 }
374}
375
08e29af3
ED		 376#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
377
378static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 379{
08e29af3
ED		 380 if (sk->sk_flags & flags) {
381 sk->sk_flags &= ~flags;
382 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 383 net_disable_timestamp();
1da177e4
LT		 384 }
385}
386
387
f0088a50
DV		 388int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
389{
766e9037 390 int err;
f0088a50 391 int skb_len;
3b885787
NH		 392 unsigned long flags;
393 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 394
0fd7bac6 395 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 396 atomic_inc(&sk->sk_drops);
3847ce32 397 trace_sock_rcvqueue_full(sk, skb);
766e9037 398 return -ENOMEM;
f0088a50
DV		 399 }
400
fda9ef5d 401 err = sk_filter(sk, skb);
f0088a50 402 if (err)
766e9037 403 return err;
f0088a50 404
c76562b6 405 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 406 atomic_inc(&sk->sk_drops);
407 return -ENOBUFS;
3ab224be
HA		 408 }
409
f0088a50
DV		 410 skb->dev = NULL;
411 skb_set_owner_r(skb, sk);
49ad9599 412
f0088a50
DV		 413 /* Cache the SKB length before we tack it onto the receive
414 * queue. Once it is added it no longer belongs to us and
415 * may be freed by other threads of control pulling packets
416 * from the queue.
417 */
418 skb_len = skb->len;
419
7fee226a
ED		 420 /* we escape from rcu protected region, make sure we dont leak
421 * a norefcounted dst
422 */
423 skb_dst_force(skb);
424
3b885787
NH		 425 spin_lock_irqsave(&list->lock, flags);
426 skb->dropcount = atomic_read(&sk->sk_drops);
427 __skb_queue_tail(list, skb);
428 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 429
430 if (!sock_flag(sk, SOCK_DEAD))
431 sk->sk_data_ready(sk, skb_len);
766e9037 432 return 0;
f0088a50
DV		 433}
434EXPORT_SYMBOL(sock_queue_rcv_skb);
435
58a5a7b9 436int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 437{
438 int rc = NET_RX_SUCCESS;
439
fda9ef5d 440 if (sk_filter(sk, skb))
f0088a50
DV		 441 goto discard_and_relse;
442
443 skb->dev = NULL;
444
f545a38f 445 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) {
c377411f
ED		 446 atomic_inc(&sk->sk_drops);
447 goto discard_and_relse;
448 }
58a5a7b9
ACM		 449 if (nested)
450 bh_lock_sock_nested(sk);
451 else
452 bh_lock_sock(sk);
a5b5bb9a
IM		 453 if (!sock_owned_by_user(sk)) {
454 /*
455 * trylock + unlock semantics:
456 */
457 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
458
c57943a1 459 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 460
461 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 462 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 463 bh_unlock_sock(sk);
464 atomic_inc(&sk->sk_drops);
465 goto discard_and_relse;
466 }
467
f0088a50
DV		 468 bh_unlock_sock(sk);
469out:
470 sock_put(sk);
471 return rc;
472discard_and_relse:
473 kfree_skb(skb);
474 goto out;
475}
476EXPORT_SYMBOL(sk_receive_skb);
477
ea94ff3b
KK		 478void sk_reset_txq(struct sock *sk)
479{
480 sk_tx_queue_clear(sk);
481}
482EXPORT_SYMBOL(sk_reset_txq);
483
f0088a50
DV		 484struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
485{
b6c6712a 486 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 487
488 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 489 sk_tx_queue_clear(sk);
a9b3cd7f 490 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 491 dst_release(dst);
492 return NULL;
493 }
494
495 return dst;
496}
497EXPORT_SYMBOL(__sk_dst_check);
498
499struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
500{
501 struct dst_entry *dst = sk_dst_get(sk);
502
503 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
504 sk_dst_reset(sk);
505 dst_release(dst);
506 return NULL;
507 }
508
509 return dst;
510}
511EXPORT_SYMBOL(sk_dst_check);
512
c91f6df2
BH		 513static int sock_setbindtodevice(struct sock *sk, char __user *optval,
514 int optlen)
4878809f
DM		 515{
516 int ret = -ENOPROTOOPT;
517#ifdef CONFIG_NETDEVICES
3b1e0a65 518 struct net *net = sock_net(sk);
4878809f
DM		 519 char devname[IFNAMSIZ];
520 int index;
521
522 /* Sorry... */
523 ret = -EPERM;
5e1fccc0 524 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 525 goto out;
526
527 ret = -EINVAL;
528 if (optlen < 0)
529 goto out;
530
531 /* Bind this socket to a particular device like "eth0",
532 * as specified in the passed interface name. If the
533 * name is "" or the option length is zero the socket
534 * is not bound.
535 */
536 if (optlen > IFNAMSIZ - 1)
537 optlen = IFNAMSIZ - 1;
538 memset(devname, 0, sizeof(devname));
539
540 ret = -EFAULT;
541 if (copy_from_user(devname, optval, optlen))
542 goto out;
543
000ba2e4
DM		 544 index = 0;
545 if (devname[0] != '\0') {
bf8e56bf 546 struct net_device *dev;
4878809f 547
bf8e56bf
ED		 548 rcu_read_lock();
549 dev = dev_get_by_name_rcu(net, devname);
550 if (dev)
551 index = dev->ifindex;
552 rcu_read_unlock();
4878809f
DM		 553 ret = -ENODEV;
554 if (!dev)
555 goto out;
4878809f
DM		 556 }
557
558 lock_sock(sk);
559 sk->sk_bound_dev_if = index;
560 sk_dst_reset(sk);
561 release_sock(sk);
562
563 ret = 0;
564
565out:
566#endif
567
568 return ret;
569}
570
c91f6df2
BH		 571static int sock_getbindtodevice(struct sock *sk, char __user *optval,
572 int __user *optlen, int len)
573{
574 int ret = -ENOPROTOOPT;
575#ifdef CONFIG_NETDEVICES
576 struct net *net = sock_net(sk);
c91f6df2 577 char devname[IFNAMSIZ];
c91f6df2
BH		 578
579 if (sk->sk_bound_dev_if == 0) {
580 len = 0;
581 goto zero;
582 }
583
584 ret = -EINVAL;
585 if (len < IFNAMSIZ)
586 goto out;
587
5dbe7c17
NS		 588 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
589 if (ret)
c91f6df2 590 goto out;
c91f6df2
BH		 591
592 len = strlen(devname) + 1;
593
594 ret = -EFAULT;
595 if (copy_to_user(optval, devname, len))
596 goto out;
597
598zero:
599 ret = -EFAULT;
600 if (put_user(len, optlen))
601 goto out;
602
603 ret = 0;
604
605out:
606#endif
607
608 return ret;
609}
610
c0ef877b
PE		 611static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
612{
613 if (valbool)
614 sock_set_flag(sk, bit);
615 else
616 sock_reset_flag(sk, bit);
617}
618
1da177e4
LT		 619/*
620 * This is meant for all protocols to use and covers goings on
621 * at the socket level. Everything here is generic.
622 */
623
624int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 625 char __user *optval, unsigned int optlen)
1da177e4 626{
2a91525c 627 struct sock *sk = sock->sk;
1da177e4
LT		 628 int val;
629 int valbool;
630 struct linger ling;
631 int ret = 0;
4ec93edb 632
1da177e4
LT		 633 /*
634 * Options without arguments
635 */
636
4878809f 637 if (optname == SO_BINDTODEVICE)
c91f6df2 638 return sock_setbindtodevice(sk, optval, optlen);
4878809f 639
e71a4783
SH		 640 if (optlen < sizeof(int))
641 return -EINVAL;
4ec93edb 642
1da177e4
LT		 643 if (get_user(val, (int __user *)optval))
644 return -EFAULT;
4ec93edb 645
2a91525c 646 valbool = val ? 1 : 0;
1da177e4
LT		 647
648 lock_sock(sk);
649
2a91525c 650 switch (optname) {
e71a4783 651 case SO_DEBUG:
2a91525c 652 if (val && !capable(CAP_NET_ADMIN))
e71a4783 653 ret = -EACCES;
2a91525c 654 else
c0ef877b 655 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 656 break;
657 case SO_REUSEADDR:
4a17fd52 658 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 659 break;
055dc21a
TH		 660 case SO_REUSEPORT:
661 sk->sk_reuseport = valbool;
662 break;
e71a4783 663 case SO_TYPE:
49c794e9 664 case SO_PROTOCOL:
0d6038ee 665 case SO_DOMAIN:
e71a4783
SH		 666 case SO_ERROR:
667 ret = -ENOPROTOOPT;
668 break;
669 case SO_DONTROUTE:
c0ef877b 670 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 671 break;
672 case SO_BROADCAST:
673 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
674 break;
675 case SO_SNDBUF:
676 /* Don't error on this BSD doesn't and if you think
82981930
ED		 677 * about it this is right. Otherwise apps have to
678 * play 'guess the biggest size' games. RCVBUF/SNDBUF
679 * are treated in BSD as hints
680 */
681 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 682set_sndbuf:
e71a4783 683 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 684 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
685 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 686 sk->sk_write_space(sk);
687 break;
1da177e4 688
e71a4783
SH		 689 case SO_SNDBUFFORCE:
690 if (!capable(CAP_NET_ADMIN)) {
691 ret = -EPERM;
692 break;
693 }
694 goto set_sndbuf;
b0573dea 695
e71a4783
SH		 696 case SO_RCVBUF:
697 /* Don't error on this BSD doesn't and if you think
82981930
ED		 698 * about it this is right. Otherwise apps have to
699 * play 'guess the biggest size' games. RCVBUF/SNDBUF
700 * are treated in BSD as hints
701 */
702 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 703set_rcvbuf:
e71a4783
SH		 704 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
705 /*
706 * We double it on the way in to account for
707 * "struct sk_buff" etc. overhead. Applications
708 * assume that the SO_RCVBUF setting they make will
709 * allow that much actual data to be received on that
710 * socket.
711 *
712 * Applications are unaware that "struct sk_buff" and
713 * other overheads allocate from the receive buffer
714 * during socket buffer allocation.
715 *
716 * And after considering the possible alternatives,
717 * returning the value we actually used in getsockopt
718 * is the most desirable behavior.
719 */
82981930 720 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 721 break;
722
723 case SO_RCVBUFFORCE:
724 if (!capable(CAP_NET_ADMIN)) {
725 ret = -EPERM;
1da177e4 726 break;
e71a4783
SH		 727 }
728 goto set_rcvbuf;
1da177e4 729
e71a4783 730 case SO_KEEPALIVE:
1da177e4 731#ifdef CONFIG_INET
3e10986d
ED		 732 if (sk->sk_protocol == IPPROTO_TCP &&
733 sk->sk_type == SOCK_STREAM)
e71a4783 734 tcp_set_keepalive(sk, valbool);
1da177e4 735#endif
e71a4783
SH		 736 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
737 break;
738
739 case SO_OOBINLINE:
740 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
741 break;
742
743 case SO_NO_CHECK:
744 sk->sk_no_check = valbool;
745 break;
746
747 case SO_PRIORITY:
5e1fccc0
EB		 748 if ((val >= 0 && val <= 6) ||
749 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 750 sk->sk_priority = val;
751 else
752 ret = -EPERM;
753 break;
754
755 case SO_LINGER:
756 if (optlen < sizeof(ling)) {
757 ret = -EINVAL; /* 1003.1g */
1da177e4 758 break;
e71a4783 759 }
2a91525c 760 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 761 ret = -EFAULT;
1da177e4 762 break;
e71a4783
SH		 763 }
764 if (!ling.l_onoff)
765 sock_reset_flag(sk, SOCK_LINGER);
766 else {
1da177e4 767#if (BITS_PER_LONG == 32)
e71a4783
SH		 768 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
769 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 770 else
e71a4783
SH		 771#endif
772 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
773 sock_set_flag(sk, SOCK_LINGER);
774 }
775 break;
776
777 case SO_BSDCOMPAT:
778 sock_warn_obsolete_bsdism("setsockopt");
779 break;
780
781 case SO_PASSCRED:
782 if (valbool)
783 set_bit(SOCK_PASSCRED, &sock->flags);
784 else
785 clear_bit(SOCK_PASSCRED, &sock->flags);
786 break;
787
788 case SO_TIMESTAMP:
92f37fd2 789 case SO_TIMESTAMPNS:
e71a4783 790 if (valbool) {
92f37fd2
ED		 791 if (optname == SO_TIMESTAMP)
792 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
793 else
794 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 795 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 796 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 797 } else {
e71a4783 798 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 799 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
800 }
e71a4783
SH		 801 break;
802
20d49473
PO		 803 case SO_TIMESTAMPING:
804 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 805 ret = -EINVAL;
20d49473
PO		 806 break;
807 }
808 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
809 val & SOF_TIMESTAMPING_TX_HARDWARE);
810 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
811 val & SOF_TIMESTAMPING_TX_SOFTWARE);
812 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
813 val & SOF_TIMESTAMPING_RX_HARDWARE);
814 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
815 sock_enable_timestamp(sk,
816 SOCK_TIMESTAMPING_RX_SOFTWARE);
817 else
818 sock_disable_timestamp(sk,
08e29af3 819 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 820 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
821 val & SOF_TIMESTAMPING_SOFTWARE);
822 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
823 val & SOF_TIMESTAMPING_SYS_HARDWARE);
824 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
825 val & SOF_TIMESTAMPING_RAW_HARDWARE);
826 break;
827
e71a4783
SH		 828 case SO_RCVLOWAT:
829 if (val < 0)
830 val = INT_MAX;
831 sk->sk_rcvlowat = val ? : 1;
832 break;
833
834 case SO_RCVTIMEO:
835 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
836 break;
837
838 case SO_SNDTIMEO:
839 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
840 break;
1da177e4 841
e71a4783
SH		 842 case SO_ATTACH_FILTER:
843 ret = -EINVAL;
844 if (optlen == sizeof(struct sock_fprog)) {
845 struct sock_fprog fprog;
1da177e4 846
e71a4783
SH		 847 ret = -EFAULT;
848 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 849 break;
e71a4783
SH		 850
851 ret = sk_attach_filter(&fprog, sk);
852 }
853 break;
854
855 case SO_DETACH_FILTER:
55b33325 856 ret = sk_detach_filter(sk);
e71a4783 857 break;
1da177e4 858
d59577b6
VB		 859 case SO_LOCK_FILTER:
860 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
861 ret = -EPERM;
862 else
863 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
864 break;
865
e71a4783
SH		 866 case SO_PASSSEC:
867 if (valbool)
868 set_bit(SOCK_PASSSEC, &sock->flags);
869 else
870 clear_bit(SOCK_PASSSEC, &sock->flags);
871 break;
4a19ec58 872 case SO_MARK:
5e1fccc0 873 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 874 ret = -EPERM;
2a91525c 875 else
4a19ec58 876 sk->sk_mark = val;
4a19ec58 877 break;
877ce7c1 878
1da177e4
LT		 879 /* We implement the SO_SNDLOWAT etc to
880 not be settable (1003.1g 5.3) */
3b885787 881 case SO_RXQ_OVFL:
8083f0fc 882 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 883 break;
6e3e939f
JB		 884
885 case SO_WIFI_STATUS:
886 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
887 break;
888
ef64a54f
PE		 889 case SO_PEEK_OFF:
890 if (sock->ops->set_peek_off)
891 sock->ops->set_peek_off(sk, val);
892 else
893 ret = -EOPNOTSUPP;
894 break;
3bdc0eba
BG		 895
896 case SO_NOFCS:
897 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
898 break;
899
7d4c04fc
KJ		 900 case SO_SELECT_ERR_QUEUE:
901 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
902 break;
903
e0d1095a 904#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 905 case SO_BUSY_POLL:
dafcc438
ET		 906 /* allow unprivileged users to decrease the value */
907 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
908 ret = -EPERM;
909 else {
910 if (val < 0)
911 ret = -EINVAL;
912 else
913 sk->sk_ll_usec = val;
914 }
915 break;
916#endif
e71a4783
SH		 917 default:
918 ret = -ENOPROTOOPT;
919 break;
4ec93edb 920 }
1da177e4
LT		 921 release_sock(sk);
922 return ret;
923}
2a91525c 924EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 925
926
3f551f94
EB		 927void cred_to_ucred(struct pid *pid, const struct cred *cred,
928 struct ucred *ucred)
929{
930 ucred->pid = pid_vnr(pid);
931 ucred->uid = ucred->gid = -1;
932 if (cred) {
933 struct user_namespace *current_ns = current_user_ns();
934
b2e4f544
EB		 935 ucred->uid = from_kuid_munged(current_ns, cred->euid);
936 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 937 }
938}
3924773a 939EXPORT_SYMBOL_GPL(cred_to_ucred);
3f551f94 940
1da177e4
LT		 941int sock_getsockopt(struct socket *sock, int level, int optname,
942 char __user *optval, int __user *optlen)
943{
944 struct sock *sk = sock->sk;
4ec93edb 945
e71a4783 946 union {
4ec93edb
YH		 947 int val;
948 struct linger ling;
1da177e4
LT		 949 struct timeval tm;
950 } v;
4ec93edb 951
4d0392be 952 int lv = sizeof(int);
1da177e4 953 int len;
4ec93edb 954
e71a4783 955 if (get_user(len, optlen))
4ec93edb 956 return -EFAULT;
e71a4783 957 if (len < 0)
1da177e4 958 return -EINVAL;
4ec93edb 959
50fee1de 960 memset(&v, 0, sizeof(v));
df0bca04 961
2a91525c 962 switch (optname) {
e71a4783
SH		 963 case SO_DEBUG:
964 v.val = sock_flag(sk, SOCK_DBG);
965 break;
966
967 case SO_DONTROUTE:
968 v.val = sock_flag(sk, SOCK_LOCALROUTE);
969 break;
970
971 case SO_BROADCAST:
1b23a5df 972 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 973 break;
974
975 case SO_SNDBUF:
976 v.val = sk->sk_sndbuf;
977 break;
978
979 case SO_RCVBUF:
980 v.val = sk->sk_rcvbuf;
981 break;
982
983 case SO_REUSEADDR:
984 v.val = sk->sk_reuse;
985 break;
986
055dc21a
TH		 987 case SO_REUSEPORT:
988 v.val = sk->sk_reuseport;
989 break;
990
e71a4783 991 case SO_KEEPALIVE:
1b23a5df 992 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 993 break;
994
995 case SO_TYPE:
996 v.val = sk->sk_type;
997 break;
998
49c794e9
JE		 999 case SO_PROTOCOL:
1000 v.val = sk->sk_protocol;
1001 break;
1002
0d6038ee
JE		 1003 case SO_DOMAIN:
1004 v.val = sk->sk_family;
1005 break;
1006
e71a4783
SH		 1007 case SO_ERROR:
1008 v.val = -sock_error(sk);
2a91525c 1009 if (v.val == 0)
e71a4783
SH		 1010 v.val = xchg(&sk->sk_err_soft, 0);
1011 break;
1012
1013 case SO_OOBINLINE:
1b23a5df 1014 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1015 break;
1016
1017 case SO_NO_CHECK:
1018 v.val = sk->sk_no_check;
1019 break;
1020
1021 case SO_PRIORITY:
1022 v.val = sk->sk_priority;
1023 break;
1024
1025 case SO_LINGER:
1026 lv = sizeof(v.ling);
1b23a5df 1027 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1028 v.ling.l_linger = sk->sk_lingertime / HZ;
1029 break;
1030
1031 case SO_BSDCOMPAT:
1032 sock_warn_obsolete_bsdism("getsockopt");
1033 break;
1034
1035 case SO_TIMESTAMP:
92f37fd2
ED		 1036 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1037 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1038 break;
1039
1040 case SO_TIMESTAMPNS:
1041 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1042 break;
1043
20d49473
PO		 1044 case SO_TIMESTAMPING:
1045 v.val = 0;
1046 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
1047 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
1048 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
1049 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
1050 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
1051 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
1052 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1053 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
1054 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
1055 v.val |= SOF_TIMESTAMPING_SOFTWARE;
1056 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
1057 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
1058 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
1059 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
1060 break;
1061
e71a4783 1062 case SO_RCVTIMEO:
2a91525c 1063 lv = sizeof(struct timeval);
e71a4783
SH		 1064 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1065 v.tm.tv_sec = 0;
1066 v.tm.tv_usec = 0;
1067 } else {
1068 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1069 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1070 }
1071 break;
1072
1073 case SO_SNDTIMEO:
2a91525c 1074 lv = sizeof(struct timeval);
e71a4783
SH		 1075 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1076 v.tm.tv_sec = 0;
1077 v.tm.tv_usec = 0;
1078 } else {
1079 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1080 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1081 }
1082 break;
1da177e4 1083
e71a4783
SH		 1084 case SO_RCVLOWAT:
1085 v.val = sk->sk_rcvlowat;
1086 break;
1da177e4 1087
e71a4783 1088 case SO_SNDLOWAT:
2a91525c 1089 v.val = 1;
e71a4783 1090 break;
1da177e4 1091
e71a4783 1092 case SO_PASSCRED:
82981930 1093 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1094 break;
1da177e4 1095
e71a4783 1096 case SO_PEERCRED:
109f6e39
EB		 1097 {
1098 struct ucred peercred;
1099 if (len > sizeof(peercred))
1100 len = sizeof(peercred);
1101 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1102 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1103 return -EFAULT;
1104 goto lenout;
109f6e39 1105 }
1da177e4 1106
e71a4783
SH		 1107 case SO_PEERNAME:
1108 {
1109 char address[128];
1110
1111 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1112 return -ENOTCONN;
1113 if (lv < len)
1114 return -EINVAL;
1115 if (copy_to_user(optval, address, len))
1116 return -EFAULT;
1117 goto lenout;
1118 }
1da177e4 1119
e71a4783
SH		 1120 /* Dubious BSD thing... Probably nobody even uses it, but
1121 * the UNIX standard wants it for whatever reason... -DaveM
1122 */
1123 case SO_ACCEPTCONN:
1124 v.val = sk->sk_state == TCP_LISTEN;
1125 break;
1da177e4 1126
e71a4783 1127 case SO_PASSSEC:
82981930 1128 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1129 break;
877ce7c1 1130
e71a4783
SH		 1131 case SO_PEERSEC:
1132 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1133
4a19ec58
LAT		 1134 case SO_MARK:
1135 v.val = sk->sk_mark;
1136 break;
1137
3b885787 1138 case SO_RXQ_OVFL:
1b23a5df 1139 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1140 break;
1141
6e3e939f 1142 case SO_WIFI_STATUS:
1b23a5df 1143 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1144 break;
1145
ef64a54f
PE		 1146 case SO_PEEK_OFF:
1147 if (!sock->ops->set_peek_off)
1148 return -EOPNOTSUPP;
1149
1150 v.val = sk->sk_peek_off;
1151 break;
bc2f7996 1152 case SO_NOFCS:
1b23a5df 1153 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1154 break;
c91f6df2 1155
f7b86bfe 1156 case SO_BINDTODEVICE:
c91f6df2
BH		 1157 return sock_getbindtodevice(sk, optval, optlen, len);
1158
a8fc9277
PE		 1159 case SO_GET_FILTER:
1160 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1161 if (len < 0)
1162 return len;
1163
1164 goto lenout;
c91f6df2 1165
d59577b6
VB		 1166 case SO_LOCK_FILTER:
1167 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1168 break;
1169
7d4c04fc
KJ		 1170 case SO_SELECT_ERR_QUEUE:
1171 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1172 break;
1173
e0d1095a 1174#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1175 case SO_BUSY_POLL:
dafcc438
ET		 1176 v.val = sk->sk_ll_usec;
1177 break;
1178#endif
1179
e71a4783
SH		 1180 default:
1181 return -ENOPROTOOPT;
1da177e4 1182 }
e71a4783 1183
1da177e4
LT		 1184 if (len > lv)
1185 len = lv;
1186 if (copy_to_user(optval, &v, len))
1187 return -EFAULT;
1188lenout:
4ec93edb
YH		 1189 if (put_user(len, optlen))
1190 return -EFAULT;
1191 return 0;
1da177e4
LT		 1192}
1193
a5b5bb9a
IM		 1194/*
1195 * Initialize an sk_lock.
1196 *
1197 * (We also register the sk_lock with the lock validator.)
1198 */
b6f99a21 1199static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1200{
ed07536e
PZ		 1201 sock_lock_init_class_and_name(sk,
1202 af_family_slock_key_strings[sk->sk_family],
1203 af_family_slock_keys + sk->sk_family,
1204 af_family_key_strings[sk->sk_family],
1205 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1206}
1207
4dc6dc71
ED		 1208/*
1209 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1210 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1211 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1212 */
f1a6c4da
PE		 1213static void sock_copy(struct sock *nsk, const struct sock *osk)
1214{
1215#ifdef CONFIG_SECURITY_NETWORK
1216 void *sptr = nsk->sk_security;
1217#endif
68835aba
ED		 1218 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1219
1220 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1221 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1222
f1a6c4da
PE		 1223#ifdef CONFIG_SECURITY_NETWORK
1224 nsk->sk_security = sptr;
1225 security_sk_clone(osk, nsk);
1226#endif
1227}
1228
fcbdf09d
OP		 1229void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1230{
1231 unsigned long nulls1, nulls2;
1232
1233 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1234 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1235 if (nulls1 > nulls2)
1236 swap(nulls1, nulls2);
1237
1238 if (nulls1 != 0)
1239 memset((char *)sk, 0, nulls1);
1240 memset((char *)sk + nulls1 + sizeof(void *), 0,
1241 nulls2 - nulls1 - sizeof(void *));
1242 memset((char *)sk + nulls2 + sizeof(void *), 0,
1243 size - nulls2 - sizeof(void *));
1244}
1245EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1246
2e4afe7b
PE		 1247static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1248 int family)
c308c1b2
PE		 1249{
1250 struct sock *sk;
1251 struct kmem_cache *slab;
1252
1253 slab = prot->slab;
e912b114
ED		 1254 if (slab != NULL) {
1255 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1256 if (!sk)
1257 return sk;
1258 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1259 if (prot->clear_sk)
1260 prot->clear_sk(sk, prot->obj_size);
1261 else
1262 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1263 }
fcbdf09d 1264 } else
c308c1b2
PE		 1265 sk = kmalloc(prot->obj_size, priority);
1266
2e4afe7b 1267 if (sk != NULL) {
a98b65a3
VN		 1268 kmemcheck_annotate_bitfield(sk, flags);
1269
2e4afe7b
PE		 1270 if (security_sk_alloc(sk, family, priority))
1271 goto out_free;
1272
1273 if (!try_module_get(prot->owner))
1274 goto out_free_sec;
e022f0b4 1275 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1276 }
1277
c308c1b2 1278 return sk;
2e4afe7b
PE		 1279
1280out_free_sec:
1281 security_sk_free(sk);
1282out_free:
1283 if (slab != NULL)
1284 kmem_cache_free(slab, sk);
1285 else
1286 kfree(sk);
1287 return NULL;
c308c1b2
PE		 1288}
1289
1290static void sk_prot_free(struct proto *prot, struct sock *sk)
1291{
1292 struct kmem_cache *slab;
2e4afe7b 1293 struct module *owner;
c308c1b2 1294
2e4afe7b 1295 owner = prot->owner;
c308c1b2 1296 slab = prot->slab;
2e4afe7b
PE		 1297
1298 security_sk_free(sk);
c308c1b2
PE		 1299 if (slab != NULL)
1300 kmem_cache_free(slab, sk);
1301 else
1302 kfree(sk);
2e4afe7b 1303 module_put(owner);
c308c1b2
PE		 1304}
1305
8fb974c9 1306#if IS_ENABLED(CONFIG_NET_CLS_CGROUP)
211d2f97 1307void sock_update_classid(struct sock *sk)
f8451725 1308{
1144182a 1309 u32 classid;
f8451725 1310
211d2f97 1311 classid = task_cls_classid(current);
3afa6d00 1312 if (classid != sk->sk_classid)
f8451725
HX		 1313 sk->sk_classid = classid;
1314}
82862742 1315EXPORT_SYMBOL(sock_update_classid);
8fb974c9 1316#endif
5bc1421e 1317
51e4e7fa 1318#if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
6ffd4641 1319void sock_update_netprioidx(struct sock *sk)
5bc1421e 1320{
5bc1421e
NH		 1321 if (in_interrupt())
1322 return;
2b73bc65 1323
6ffd4641 1324 sk->sk_cgrp_prioidx = task_netprioidx(current);
5bc1421e
NH		 1325}
1326EXPORT_SYMBOL_GPL(sock_update_netprioidx);
f8451725
HX		 1327#endif
1328
1da177e4
LT		 1329/**
1330 * sk_alloc - All socket objects are allocated here
c4ea43c5 1331 * @net: the applicable net namespace
4dc3b16b
PP		 1332 * @family: protocol family
1333 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1334 * @prot: struct proto associated with this new sock instance
1da177e4 1335 */
1b8d7ae4 1336struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1337 struct proto *prot)
1da177e4 1338{
c308c1b2 1339 struct sock *sk;
1da177e4 1340
154adbc8 1341 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1342 if (sk) {
154adbc8
PE		 1343 sk->sk_family = family;
1344 /*
1345 * See comment in struct sock definition to understand
1346 * why we need sk_prot_creator -acme
1347 */
1348 sk->sk_prot = sk->sk_prot_creator = prot;
1349 sock_lock_init(sk);
3b1e0a65 1350 sock_net_set(sk, get_net(net));
d66ee058 1351 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1352
211d2f97 1353 sock_update_classid(sk);
6ffd4641 1354 sock_update_netprioidx(sk);
1da177e4 1355 }
a79af59e 1356
2e4afe7b 1357 return sk;
1da177e4 1358}
2a91525c 1359EXPORT_SYMBOL(sk_alloc);
1da177e4 1360
2b85a34e 1361static void __sk_free(struct sock *sk)
1da177e4
LT		 1362{
1363 struct sk_filter *filter;
1da177e4
LT		 1364
1365 if (sk->sk_destruct)
1366 sk->sk_destruct(sk);
1367
a898def2
PM		 1368 filter = rcu_dereference_check(sk->sk_filter,
1369 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1370 if (filter) {
309dd5fc 1371 sk_filter_uncharge(sk, filter);
a9b3cd7f 1372 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1373 }
1374
08e29af3 1375 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1376
1377 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1378 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1379 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1380
109f6e39
EB		 1381 if (sk->sk_peer_cred)
1382 put_cred(sk->sk_peer_cred);
1383 put_pid(sk->sk_peer_pid);
3b1e0a65 1384 put_net(sock_net(sk));
c308c1b2 1385 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1386}
2b85a34e
ED		 1387
1388void sk_free(struct sock *sk)
1389{
1390 /*
25985edc 1391 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1392 * some packets are still in some tx queue.
1393 * If not null, sock_wfree() will call __sk_free(sk) later
1394 */
1395 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1396 __sk_free(sk);
1397}
2a91525c 1398EXPORT_SYMBOL(sk_free);
1da177e4 1399
edf02087 1400/*
25985edc
LDM		 1401 * Last sock_put should drop reference to sk->sk_net. It has already
1402 * been dropped in sk_change_net. Taking reference to stopping namespace
edf02087 1403 * is not an option.
25985edc 1404 * Take reference to a socket to remove it from hash _alive_ and after that
edf02087
DL		 1405 * destroy it in the context of init_net.
1406 */
1407void sk_release_kernel(struct sock *sk)
1408{
1409 if (sk == NULL || sk->sk_socket == NULL)
1410 return;
1411
1412 sock_hold(sk);
1413 sock_release(sk->sk_socket);
65a18ec5 1414 release_net(sock_net(sk));
3b1e0a65 1415 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1416 sock_put(sk);
1417}
45af1754 1418EXPORT_SYMBOL(sk_release_kernel);
edf02087 1419
475f1b52
SR		 1420static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1421{
1422 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1423 sock_update_memcg(newsk);
1424}
1425
e56c57d0
ED		 1426/**
1427 * sk_clone_lock - clone a socket, and lock its clone
1428 * @sk: the socket to clone
1429 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1430 *
1431 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1432 */
1433struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1434{
8fd1d178 1435 struct sock *newsk;
87d11ceb 1436
8fd1d178 1437 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1438 if (newsk != NULL) {
1439 struct sk_filter *filter;
1440
892c141e 1441 sock_copy(newsk, sk);
87d11ceb
ACM		 1442
1443 /* SANITY */
3b1e0a65 1444 get_net(sock_net(newsk));
87d11ceb
ACM		 1445 sk_node_init(&newsk->sk_node);
1446 sock_lock_init(newsk);
1447 bh_lock_sock(newsk);
fa438ccf 1448 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1449 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1450
1451 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1452 /*
1453 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1454 */
1455 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1456 atomic_set(&newsk->sk_omem_alloc, 0);
1457 skb_queue_head_init(&newsk->sk_receive_queue);
1458 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1459#ifdef CONFIG_NET_DMA
1460 skb_queue_head_init(&newsk->sk_async_wait_queue);
1461#endif
87d11ceb 1462
b6c6712a 1463 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1464 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1465 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1466 af_callback_keys + newsk->sk_family,
1467 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1468
1469 newsk->sk_dst_cache = NULL;
1470 newsk->sk_wmem_queued = 0;
1471 newsk->sk_forward_alloc = 0;
1472 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1473 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1474
1475 sock_reset_flag(newsk, SOCK_DONE);
1476 skb_queue_head_init(&newsk->sk_error_queue);
1477
0d7da9dd 1478 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb
ACM		 1479 if (filter != NULL)
1480 sk_filter_charge(newsk, filter);
1481
1482 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1483 /* It is still raw copy of parent, so invalidate
1484 * destructor and make plain sk_free() */
1485 newsk->sk_destruct = NULL;
b0691c8e 1486 bh_unlock_sock(newsk);
87d11ceb
ACM		 1487 sk_free(newsk);
1488 newsk = NULL;
1489 goto out;
1490 }
1491
1492 newsk->sk_err = 0;
1493 newsk->sk_priority = 0;
4dc6dc71
ED		 1494 /*
1495 * Before updating sk_refcnt, we must commit prior changes to memory
1496 * (Documentation/RCU/rculist_nulls.txt for details)
1497 */
1498 smp_wmb();
87d11ceb
ACM		 1499 atomic_set(&newsk->sk_refcnt, 2);
1500
1501 /*
1502 * Increment the counter in the same struct proto as the master
1503 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1504 * is the same as sk->sk_prot->socks, as this field was copied
1505 * with memcpy).
1506 *
1507 * This _changes_ the previous behaviour, where
1508 * tcp_create_openreq_child always was incrementing the
1509 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1510 * to be taken into account in all callers. -acme
1511 */
1512 sk_refcnt_debug_inc(newsk);
972692e0 1513 sk_set_socket(newsk, NULL);
43815482 1514 newsk->sk_wq = NULL;
87d11ceb 1515
f3f511e1
GC		 1516 sk_update_clone(sk, newsk);
1517
87d11ceb 1518 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1519 sk_sockets_allocated_inc(newsk);
704da560 1520
08e29af3 1521 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1522 net_enable_timestamp();
87d11ceb
ACM		 1523 }
1524out:
1525 return newsk;
1526}
e56c57d0 1527EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1528
9958089a
AK		 1529void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1530{
1531 __sk_dst_set(sk, dst);
1532 sk->sk_route_caps = dst->dev->features;
1533 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1534 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1535 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1536 if (sk_can_gso(sk)) {
82cc1a7a 1537 if (dst->header_len) {
9958089a 1538 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1539 } else {
9958089a 1540 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1541 sk->sk_gso_max_size = dst->dev->gso_max_size;
1485348d 1542 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
82cc1a7a 1543 }
9958089a
AK		 1544 }
1545}
1546EXPORT_SYMBOL_GPL(sk_setup_caps);
1547
1da177e4
LT		 1548/*
1549 * Simple resource managers for sockets.
1550 */
1551
1552
4ec93edb
YH		 1553/*
1554 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1555 */
1556void sock_wfree(struct sk_buff *skb)
1557{
1558 struct sock *sk = skb->sk;
d99927f4 1559 unsigned int len = skb->truesize;
1da177e4 1560
d99927f4
ED		 1561 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1562 /*
1563 * Keep a reference on sk_wmem_alloc, this will be released
1564 * after sk_write_space() call
1565 */
1566 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1567 sk->sk_write_space(sk);
d99927f4
ED		 1568 len = 1;
1569 }
2b85a34e 1570 /*
d99927f4
ED		 1571 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1572 * could not do because of in-flight packets
2b85a34e 1573 */
d99927f4 1574 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1575 __sk_free(sk);
1da177e4 1576}
2a91525c 1577EXPORT_SYMBOL(sock_wfree);
1da177e4 1578
f2f872f9
ED		 1579void skb_orphan_partial(struct sk_buff *skb)
1580{
1581 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1582 * so we do not completely orphan skb, but transfert all
1583 * accounted bytes but one, to avoid unexpected reorders.
1584 */
1585 if (skb->destructor == sock_wfree
1586#ifdef CONFIG_INET
1587 || skb->destructor == tcp_wfree
1588#endif
1589 ) {
1590 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1591 skb->truesize = 1;
1592 } else {
1593 skb_orphan(skb);
1594 }
1595}
1596EXPORT_SYMBOL(skb_orphan_partial);
1597
4ec93edb
YH		 1598/*
1599 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1600 */
1601void sock_rfree(struct sk_buff *skb)
1602{
1603 struct sock *sk = skb->sk;
d361fd59 1604 unsigned int len = skb->truesize;
1da177e4 1605
d361fd59
ED		 1606 atomic_sub(len, &sk->sk_rmem_alloc);
1607 sk_mem_uncharge(sk, len);
1da177e4 1608}
2a91525c 1609EXPORT_SYMBOL(sock_rfree);
1da177e4 1610
41063e9d
DM		 1611void sock_edemux(struct sk_buff *skb)
1612{
e812347c
ED		 1613 struct sock *sk = skb->sk;
1614
1c463e57 1615#ifdef CONFIG_INET
e812347c
ED		 1616 if (sk->sk_state == TCP_TIME_WAIT)
1617 inet_twsk_put(inet_twsk(sk));
1618 else
1c463e57 1619#endif
e812347c 1620 sock_put(sk);
41063e9d
DM		 1621}
1622EXPORT_SYMBOL(sock_edemux);
1da177e4 1623
976d0201 1624kuid_t sock_i_uid(struct sock *sk)
1da177e4 1625{
976d0201 1626 kuid_t uid;
1da177e4 1627
f064af1e 1628 read_lock_bh(&sk->sk_callback_lock);
976d0201 1629 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1630 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1631 return uid;
1632}
2a91525c 1633EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1634
1635unsigned long sock_i_ino(struct sock *sk)
1636{
1637 unsigned long ino;
1638
f064af1e 1639 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1640 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1641 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1642 return ino;
1643}
2a91525c 1644EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1645
1646/*
1647 * Allocate a skb from the socket's send buffer.
1648 */
86a76caf 1649struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1650 gfp_t priority)
1da177e4
LT		 1651{
1652 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1653 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1654 if (skb) {
1655 skb_set_owner_w(skb, sk);
1656 return skb;
1657 }
1658 }
1659 return NULL;
1660}
2a91525c 1661EXPORT_SYMBOL(sock_wmalloc);
1da177e4
LT		 1662
1663/*
1664 * Allocate a skb from the socket's receive buffer.
4ec93edb 1665 */
86a76caf 1666struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1667 gfp_t priority)
1da177e4
LT		 1668{
1669 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1670 struct sk_buff *skb = alloc_skb(size, priority);
1671 if (skb) {
1672 skb_set_owner_r(skb, sk);
1673 return skb;
1674 }
1675 }
1676 return NULL;
1677}
1678
4ec93edb 1679/*
1da177e4 1680 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1681 */
dd0fc66f 1682void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1683{
95c96174 1684 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1685 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1686 void *mem;
1687 /* First do the add, to avoid the race if kmalloc
4ec93edb 1688 * might sleep.
1da177e4
LT		 1689 */
1690 atomic_add(size, &sk->sk_omem_alloc);
1691 mem = kmalloc(size, priority);
1692 if (mem)
1693 return mem;
1694 atomic_sub(size, &sk->sk_omem_alloc);
1695 }
1696 return NULL;
1697}
2a91525c 1698EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1699
1700/*
1701 * Free an option memory block.
1702 */
1703void sock_kfree_s(struct sock *sk, void *mem, int size)
1704{
1705 kfree(mem);
1706 atomic_sub(size, &sk->sk_omem_alloc);
1707}
2a91525c 1708EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1709
1710/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1711 I think, these locks should be removed for datagram sockets.
1712 */
2a91525c 1713static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1714{
1715 DEFINE_WAIT(wait);
1716
1717 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1718 for (;;) {
1719 if (!timeo)
1720 break;
1721 if (signal_pending(current))
1722 break;
1723 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1724 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1725 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1726 break;
1727 if (sk->sk_shutdown & SEND_SHUTDOWN)
1728 break;
1729 if (sk->sk_err)
1730 break;
1731 timeo = schedule_timeout(timeo);
1732 }
aa395145 1733 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1734 return timeo;
1735}
1736
1737
1738/*
1739 * Generic send/receive buffer handlers
1740 */
1741
4cc7f68d
HX		 1742struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1743 unsigned long data_len, int noblock,
1744 int *errcode)
1da177e4
LT		 1745{
1746 struct sk_buff *skb;
7d877f3b 1747 gfp_t gfp_mask;
1da177e4
LT		 1748 long timeo;
1749 int err;
cc9b17ad
JW		 1750 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1751
1752 err = -EMSGSIZE;
1753 if (npages > MAX_SKB_FRAGS)
1754 goto failure;
1da177e4
LT		 1755
1756 gfp_mask = sk->sk_allocation;
1757 if (gfp_mask & __GFP_WAIT)
1758 gfp_mask |= __GFP_REPEAT;
1759
1760 timeo = sock_sndtimeo(sk, noblock);
1761 while (1) {
1762 err = sock_error(sk);
1763 if (err != 0)
1764 goto failure;
1765
1766 err = -EPIPE;
1767 if (sk->sk_shutdown & SEND_SHUTDOWN)
1768 goto failure;
1769
1770 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1771 skb = alloc_skb(header_len, gfp_mask);
1da177e4 1772 if (skb) {
1da177e4
LT		 1773 int i;
1774
1775 /* No pages, we're done... */
1776 if (!data_len)
1777 break;
1778
1da177e4
LT		 1779 skb->truesize += data_len;
1780 skb_shinfo(skb)->nr_frags = npages;
1781 for (i = 0; i < npages; i++) {
1782 struct page *page;
1da177e4
LT		 1783
1784 page = alloc_pages(sk->sk_allocation, 0);
1785 if (!page) {
1786 err = -ENOBUFS;
1787 skb_shinfo(skb)->nr_frags = i;
1788 kfree_skb(skb);
1789 goto failure;
1790 }
1791
ea2ab693
IC		 1792 __skb_fill_page_desc(skb, i,
1793 page, 0,
1794 (data_len >= PAGE_SIZE ?
1795 PAGE_SIZE :
1796 data_len));
1da177e4
LT		 1797 data_len -= PAGE_SIZE;
1798 }
1799
1800 /* Full success... */
1801 break;
1802 }
1803 err = -ENOBUFS;
1804 goto failure;
1805 }
1806 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1807 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1808 err = -EAGAIN;
1809 if (!timeo)
1810 goto failure;
1811 if (signal_pending(current))
1812 goto interrupted;
1813 timeo = sock_wait_for_wmem(sk, timeo);
1814 }
1815
1816 skb_set_owner_w(skb, sk);
1817 return skb;
1818
1819interrupted:
1820 err = sock_intr_errno(timeo);
1821failure:
1822 *errcode = err;
1823 return NULL;
1824}
4cc7f68d 1825EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1826
4ec93edb 1827struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1828 int noblock, int *errcode)
1829{
1830 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1831}
2a91525c 1832EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1833
5640f768
ED		 1834/* On 32bit arches, an skb frag is limited to 2^15 */
1835#define SKB_FRAG_PAGE_ORDER get_order(32768)
1836
1837bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1838{
1839 int order;
1840
1841 if (pfrag->page) {
1842 if (atomic_read(&pfrag->page->_count) == 1) {
1843 pfrag->offset = 0;
1844 return true;
1845 }
1846 if (pfrag->offset < pfrag->size)
1847 return true;
1848 put_page(pfrag->page);
1849 }
1850
1851 /* We restrict high order allocations to users that can afford to wait */
1852 order = (sk->sk_allocation & __GFP_WAIT) ? SKB_FRAG_PAGE_ORDER : 0;
1853
1854 do {
1855 gfp_t gfp = sk->sk_allocation;
1856
1857 if (order)
1858 gfp |= __GFP_COMP | __GFP_NOWARN;
1859 pfrag->page = alloc_pages(gfp, order);
1860 if (likely(pfrag->page)) {
1861 pfrag->offset = 0;
1862 pfrag->size = PAGE_SIZE << order;
1863 return true;
1864 }
1865 } while (--order >= 0);
1866
1867 sk_enter_memory_pressure(sk);
1868 sk_stream_moderate_sndbuf(sk);
1869 return false;
1870}
1871EXPORT_SYMBOL(sk_page_frag_refill);
1872
1da177e4 1873static void __lock_sock(struct sock *sk)
f39234d6
NK		 1874 __releases(&sk->sk_lock.slock)
1875 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1876{
1877 DEFINE_WAIT(wait);
1878
e71a4783 1879 for (;;) {
1da177e4
LT		 1880 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1881 TASK_UNINTERRUPTIBLE);
1882 spin_unlock_bh(&sk->sk_lock.slock);
1883 schedule();
1884 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1885 if (!sock_owned_by_user(sk))
1da177e4
LT		 1886 break;
1887 }
1888 finish_wait(&sk->sk_lock.wq, &wait);
1889}
1890
1891static void __release_sock(struct sock *sk)
f39234d6
NK		 1892 __releases(&sk->sk_lock.slock)
1893 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1894{
1895 struct sk_buff *skb = sk->sk_backlog.head;
1896
1897 do {
1898 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1899 bh_unlock_sock(sk);
1900
1901 do {
1902 struct sk_buff *next = skb->next;
1903
e4cbb02a 1904 prefetch(next);
7fee226a 1905 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1906 skb->next = NULL;
c57943a1 1907 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1908
1909 /*
1910 * We are in process context here with softirqs
1911 * disabled, use cond_resched_softirq() to preempt.
1912 * This is safe to do because we've taken the backlog
1913 * queue private:
1914 */
1915 cond_resched_softirq();
1916
1917 skb = next;
1918 } while (skb != NULL);
1919
1920 bh_lock_sock(sk);
e71a4783 1921 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1922
1923 /*
1924 * Doing the zeroing here guarantee we can not loop forever
1925 * while a wild producer attempts to flood us.
1926 */
1927 sk->sk_backlog.len = 0;
1da177e4
LT		 1928}
1929
1930/**
1931 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1932 * @sk: sock to wait on
1933 * @timeo: for how long
1da177e4
LT		 1934 *
1935 * Now socket state including sk->sk_err is changed only under lock,
1936 * hence we may omit checks after joining wait queue.
1937 * We check receive queue before schedule() only as optimization;
1938 * it is very likely that release_sock() added new data.
1939 */
1940int sk_wait_data(struct sock *sk, long *timeo)
1941{
1942 int rc;
1943 DEFINE_WAIT(wait);
1944
aa395145 1945 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1946 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1947 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1948 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1949 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1950 return rc;
1951}
1da177e4
LT		 1952EXPORT_SYMBOL(sk_wait_data);
1953
3ab224be
HA		 1954/**
1955 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1956 * @sk: socket
1957 * @size: memory size to allocate
1958 * @kind: allocation type
1959 *
1960 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1961 * rmem allocation. This function assumes that protocols which have
1962 * memory_pressure use sk_wmem_queued as write buffer accounting.
1963 */
1964int __sk_mem_schedule(struct sock *sk, int size, int kind)
1965{
1966 struct proto *prot = sk->sk_prot;
1967 int amt = sk_mem_pages(size);
8d987e5c 1968 long allocated;
e1aab161 1969 int parent_status = UNDER_LIMIT;
3ab224be
HA		 1970
1971 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 1972
e1aab161 1973 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 1974
1975 /* Under limit. */
e1aab161
GC		 1976 if (parent_status == UNDER_LIMIT &&
1977 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 1978 sk_leave_memory_pressure(sk);
3ab224be
HA		 1979 return 1;
1980 }
1981
e1aab161
GC		 1982 /* Under pressure. (we or our parents) */
1983 if ((parent_status > SOFT_LIMIT) ||
1984 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 1985 sk_enter_memory_pressure(sk);
3ab224be 1986
e1aab161
GC		 1987 /* Over hard limit (we or our parents) */
1988 if ((parent_status == OVER_LIMIT) ||
1989 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 1990 goto suppress_allocation;
1991
1992 /* guarantee minimum buffer size under pressure */
1993 if (kind == SK_MEM_RECV) {
1994 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1995 return 1;
180d8cd9 1996
3ab224be
HA		 1997 } else { /* SK_MEM_SEND */
1998 if (sk->sk_type == SOCK_STREAM) {
1999 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2000 return 1;
2001 } else if (atomic_read(&sk->sk_wmem_alloc) <
2002 prot->sysctl_wmem[0])
2003 return 1;
2004 }
2005
180d8cd9 2006 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2007 int alloc;
2008
180d8cd9 2009 if (!sk_under_memory_pressure(sk))
1748376b 2010 return 1;
180d8cd9
GC		 2011 alloc = sk_sockets_allocated_read_positive(sk);
2012 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2013 sk_mem_pages(sk->sk_wmem_queued +
2014 atomic_read(&sk->sk_rmem_alloc) +
2015 sk->sk_forward_alloc))
2016 return 1;
2017 }
2018
2019suppress_allocation:
2020
2021 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2022 sk_stream_moderate_sndbuf(sk);
2023
2024 /* Fail only if socket is _under_ its sndbuf.
2025 * In this case we cannot block, so that we have to fail.
2026 */
2027 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2028 return 1;
2029 }
2030
3847ce32
SM		 2031 trace_sock_exceed_buf_limit(sk, prot, allocated);
2032
3ab224be
HA		 2033 /* Alas. Undo changes. */
2034 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2035
0e90b31f 2036 sk_memory_allocated_sub(sk, amt);
180d8cd9 2037
3ab224be
HA		 2038 return 0;
2039}
3ab224be
HA		 2040EXPORT_SYMBOL(__sk_mem_schedule);
2041
2042/**
2043 * __sk_reclaim - reclaim memory_allocated
2044 * @sk: socket
2045 */
2046void __sk_mem_reclaim(struct sock *sk)
2047{
180d8cd9 2048 sk_memory_allocated_sub(sk,
0e90b31f 2049 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
3ab224be
HA		 2050 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
2051
180d8cd9
GC		 2052 if (sk_under_memory_pressure(sk) &&
2053 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2054 sk_leave_memory_pressure(sk);
3ab224be 2055}
3ab224be
HA		 2056EXPORT_SYMBOL(__sk_mem_reclaim);
2057
2058
1da177e4
LT		 2059/*
2060 * Set of default routines for initialising struct proto_ops when
2061 * the protocol does not support a particular function. In certain
2062 * cases where it makes no sense for a protocol to have a "do nothing"
2063 * function, some default processing is provided.
2064 */
2065
2066int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2067{
2068 return -EOPNOTSUPP;
2069}
2a91525c 2070EXPORT_SYMBOL(sock_no_bind);
1da177e4 2071
4ec93edb 2072int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2073 int len, int flags)
2074{
2075 return -EOPNOTSUPP;
2076}
2a91525c 2077EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2078
2079int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2080{
2081 return -EOPNOTSUPP;
2082}
2a91525c 2083EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2084
2085int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2086{
2087 return -EOPNOTSUPP;
2088}
2a91525c 2089EXPORT_SYMBOL(sock_no_accept);
1da177e4 2090
4ec93edb 2091int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2092 int *len, int peer)
2093{
2094 return -EOPNOTSUPP;
2095}
2a91525c 2096EXPORT_SYMBOL(sock_no_getname);
1da177e4 2097
2a91525c 2098unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2099{
2100 return 0;
2101}
2a91525c 2102EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2103
2104int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2105{
2106 return -EOPNOTSUPP;
2107}
2a91525c 2108EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2109
2110int sock_no_listen(struct socket *sock, int backlog)
2111{
2112 return -EOPNOTSUPP;
2113}
2a91525c 2114EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2115
2116int sock_no_shutdown(struct socket *sock, int how)
2117{
2118 return -EOPNOTSUPP;
2119}
2a91525c 2120EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2121
2122int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2123 char __user *optval, unsigned int optlen)
1da177e4
LT		 2124{
2125 return -EOPNOTSUPP;
2126}
2a91525c 2127EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2128
2129int sock_no_getsockopt(struct socket *sock, int level, int optname,
2130 char __user *optval, int __user *optlen)
2131{
2132 return -EOPNOTSUPP;
2133}
2a91525c 2134EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 2135
2136int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2137 size_t len)
2138{
2139 return -EOPNOTSUPP;
2140}
2a91525c 2141EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 2142
2143int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2144 size_t len, int flags)
2145{
2146 return -EOPNOTSUPP;
2147}
2a91525c 2148EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2149
2150int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2151{
2152 /* Mirror missing mmap method error code */
2153 return -ENODEV;
2154}
2a91525c 2155EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2156
2157ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2158{
2159 ssize_t res;
2160 struct msghdr msg = {.msg_flags = flags};
2161 struct kvec iov;
2162 char *kaddr = kmap(page);
2163 iov.iov_base = kaddr + offset;
2164 iov.iov_len = size;
2165 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2166 kunmap(page);
2167 return res;
2168}
2a91525c 2169EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2170
2171/*
2172 * Default Socket Callbacks
2173 */
2174
2175static void sock_def_wakeup(struct sock *sk)
2176{
43815482
ED		 2177 struct socket_wq *wq;
2178
2179 rcu_read_lock();
2180 wq = rcu_dereference(sk->sk_wq);
2181 if (wq_has_sleeper(wq))
2182 wake_up_interruptible_all(&wq->wait);
2183 rcu_read_unlock();
1da177e4
LT		 2184}
2185
2186static void sock_def_error_report(struct sock *sk)
2187{
43815482
ED		 2188 struct socket_wq *wq;
2189
2190 rcu_read_lock();
2191 wq = rcu_dereference(sk->sk_wq);
2192 if (wq_has_sleeper(wq))
2193 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2194 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2195 rcu_read_unlock();
1da177e4
LT		 2196}
2197
2198static void sock_def_readable(struct sock *sk, int len)
2199{
43815482
ED		 2200 struct socket_wq *wq;
2201
2202 rcu_read_lock();
2203 wq = rcu_dereference(sk->sk_wq);
2204 if (wq_has_sleeper(wq))
2c6607c6 2205 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2206 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2207 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2208 rcu_read_unlock();
1da177e4
LT		 2209}
2210
2211static void sock_def_write_space(struct sock *sk)
2212{
43815482
ED		 2213 struct socket_wq *wq;
2214
2215 rcu_read_lock();
1da177e4
LT		 2216
2217 /* Do not wake up a writer until he can make "significant"
2218 * progress. --DaveM
2219 */
e71a4783 2220 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2221 wq = rcu_dereference(sk->sk_wq);
2222 if (wq_has_sleeper(wq))
2223 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2224 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2225
2226 /* Should agree with poll, otherwise some programs break */
2227 if (sock_writeable(sk))
8d8ad9d7 2228 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2229 }
2230
43815482 2231 rcu_read_unlock();
1da177e4
LT		 2232}
2233
2234static void sock_def_destruct(struct sock *sk)
2235{
a51482bd 2236 kfree(sk->sk_protinfo);
1da177e4
LT		 2237}
2238
2239void sk_send_sigurg(struct sock *sk)
2240{
2241 if (sk->sk_socket && sk->sk_socket->file)
2242 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2243 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2244}
2a91525c 2245EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2246
2247void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2248 unsigned long expires)
2249{
2250 if (!mod_timer(timer, expires))
2251 sock_hold(sk);
2252}
1da177e4
LT		 2253EXPORT_SYMBOL(sk_reset_timer);
2254
2255void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2256{
25cc4ae9 2257 if (del_timer(timer))
1da177e4
LT		 2258 __sock_put(sk);
2259}
1da177e4
LT		 2260EXPORT_SYMBOL(sk_stop_timer);
2261
2262void sock_init_data(struct socket *sock, struct sock *sk)
2263{
2264 skb_queue_head_init(&sk->sk_receive_queue);
2265 skb_queue_head_init(&sk->sk_write_queue);
2266 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 2267#ifdef CONFIG_NET_DMA
2268 skb_queue_head_init(&sk->sk_async_wait_queue);
2269#endif
1da177e4
LT		 2270
2271 sk->sk_send_head = NULL;
2272
2273 init_timer(&sk->sk_timer);
4ec93edb 2274
1da177e4
LT		 2275 sk->sk_allocation = GFP_KERNEL;
2276 sk->sk_rcvbuf = sysctl_rmem_default;
2277 sk->sk_sndbuf = sysctl_wmem_default;
2278 sk->sk_state = TCP_CLOSE;
972692e0 2279 sk_set_socket(sk, sock);
1da177e4
LT		 2280
2281 sock_set_flag(sk, SOCK_ZAPPED);
2282
e71a4783 2283 if (sock) {
1da177e4 2284 sk->sk_type = sock->type;
43815482 2285 sk->sk_wq = sock->wq;
1da177e4
LT		 2286 sock->sk = sk;
2287 } else
43815482 2288 sk->sk_wq = NULL;
1da177e4 2289
b6c6712a 2290 spin_lock_init(&sk->sk_dst_lock);
1da177e4 2291 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2292 lockdep_set_class_and_name(&sk->sk_callback_lock,
2293 af_callback_keys + sk->sk_family,
2294 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2295
2296 sk->sk_state_change = sock_def_wakeup;
2297 sk->sk_data_ready = sock_def_readable;
2298 sk->sk_write_space = sock_def_write_space;
2299 sk->sk_error_report = sock_def_error_report;
2300 sk->sk_destruct = sock_def_destruct;
2301
5640f768
ED		 2302 sk->sk_frag.page = NULL;
2303 sk->sk_frag.offset = 0;
ef64a54f 2304 sk->sk_peek_off = -1;
1da177e4 2305
109f6e39
EB		 2306 sk->sk_peer_pid = NULL;
2307 sk->sk_peer_cred = NULL;
1da177e4
LT		 2308 sk->sk_write_pending = 0;
2309 sk->sk_rcvlowat = 1;
2310 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2311 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2312
f37f0afb 2313 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2314
e0d1095a 2315#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2316 sk->sk_napi_id = 0;
64b0dc51 2317 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2318#endif
2319
4dc6dc71
ED		 2320 /*
2321 * Before updating sk_refcnt, we must commit prior changes to memory
2322 * (Documentation/RCU/rculist_nulls.txt for details)
2323 */
2324 smp_wmb();
1da177e4 2325 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2326 atomic_set(&sk->sk_drops, 0);
1da177e4 2327}
2a91525c 2328EXPORT_SYMBOL(sock_init_data);
1da177e4 2329
b5606c2d 2330void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2331{
2332 might_sleep();
a5b5bb9a 2333 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2334 if (sk->sk_lock.owned)
1da177e4 2335 __lock_sock(sk);
d2e9117c 2336 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2337 spin_unlock(&sk->sk_lock.slock);
2338 /*
2339 * The sk_lock has mutex_lock() semantics here:
2340 */
fcc70d5f 2341 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2342 local_bh_enable();
1da177e4 2343}
fcc70d5f 2344EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2345
b5606c2d 2346void release_sock(struct sock *sk)
1da177e4 2347{
a5b5bb9a
IM		 2348 /*
2349 * The sk_lock has mutex_unlock() semantics:
2350 */
2351 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2352
2353 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2354 if (sk->sk_backlog.tail)
2355 __release_sock(sk);
46d3ceab
ED		 2356
2357 if (sk->sk_prot->release_cb)
2358 sk->sk_prot->release_cb(sk);
2359
d2e9117c 2360 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 2361 if (waitqueue_active(&sk->sk_lock.wq))
2362 wake_up(&sk->sk_lock.wq);
2363 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2364}
2365EXPORT_SYMBOL(release_sock);
2366
8a74ad60
ED		 2367/**
2368 * lock_sock_fast - fast version of lock_sock
2369 * @sk: socket
2370 *
2371 * This version should be used for very small section, where process wont block
2372 * return false if fast path is taken
2373 * sk_lock.slock locked, owned = 0, BH disabled
2374 * return true if slow path is taken
2375 * sk_lock.slock unlocked, owned = 1, BH enabled
2376 */
2377bool lock_sock_fast(struct sock *sk)
2378{
2379 might_sleep();
2380 spin_lock_bh(&sk->sk_lock.slock);
2381
2382 if (!sk->sk_lock.owned)
2383 /*
2384 * Note : We must disable BH
2385 */
2386 return false;
2387
2388 __lock_sock(sk);
2389 sk->sk_lock.owned = 1;
2390 spin_unlock(&sk->sk_lock.slock);
2391 /*
2392 * The sk_lock has mutex_lock() semantics here:
2393 */
2394 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2395 local_bh_enable();
2396 return true;
2397}
2398EXPORT_SYMBOL(lock_sock_fast);
2399
1da177e4 2400int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2401{
b7aa0bf7 2402 struct timeval tv;
1da177e4 2403 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2404 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2405 tv = ktime_to_timeval(sk->sk_stamp);
2406 if (tv.tv_sec == -1)
1da177e4 2407 return -ENOENT;
b7aa0bf7
ED		 2408 if (tv.tv_sec == 0) {
2409 sk->sk_stamp = ktime_get_real();
2410 tv = ktime_to_timeval(sk->sk_stamp);
2411 }
2412 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2413}
1da177e4
LT		 2414EXPORT_SYMBOL(sock_get_timestamp);
2415
ae40eb1e
ED		 2416int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2417{
2418 struct timespec ts;
2419 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2420 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2421 ts = ktime_to_timespec(sk->sk_stamp);
2422 if (ts.tv_sec == -1)
2423 return -ENOENT;
2424 if (ts.tv_sec == 0) {
2425 sk->sk_stamp = ktime_get_real();
2426 ts = ktime_to_timespec(sk->sk_stamp);
2427 }
2428 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2429}
2430EXPORT_SYMBOL(sock_get_timestampns);
2431
20d49473 2432void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2433{
20d49473 2434 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2435 unsigned long previous_flags = sk->sk_flags;
2436
20d49473
PO		 2437 sock_set_flag(sk, flag);
2438 /*
2439 * we just set one of the two flags which require net
2440 * time stamping, but time stamping might have been on
2441 * already because of the other one
2442 */
08e29af3 2443 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2444 net_enable_timestamp();
1da177e4
LT		 2445 }
2446}
1da177e4 2447
cb820f8e
RC		 2448int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2449 int level, int type)
2450{
2451 struct sock_exterr_skb *serr;
2452 struct sk_buff *skb, *skb2;
2453 int copied, err;
2454
2455 err = -EAGAIN;
2456 skb = skb_dequeue(&sk->sk_error_queue);
2457 if (skb == NULL)
2458 goto out;
2459
2460 copied = skb->len;
2461 if (copied > len) {
2462 msg->msg_flags |= MSG_TRUNC;
2463 copied = len;
2464 }
2465 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2466 if (err)
2467 goto out_free_skb;
2468
2469 sock_recv_timestamp(msg, sk, skb);
2470
2471 serr = SKB_EXT_ERR(skb);
2472 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2473
2474 msg->msg_flags |= MSG_ERRQUEUE;
2475 err = copied;
2476
2477 /* Reset and regenerate socket error */
2478 spin_lock_bh(&sk->sk_error_queue.lock);
2479 sk->sk_err = 0;
2480 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
2481 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
2482 spin_unlock_bh(&sk->sk_error_queue.lock);
2483 sk->sk_error_report(sk);
2484 } else
2485 spin_unlock_bh(&sk->sk_error_queue.lock);
2486
2487out_free_skb:
2488 kfree_skb(skb);
2489out:
2490 return err;
2491}
2492EXPORT_SYMBOL(sock_recv_errqueue);
2493
1da177e4
LT		 2494/*
2495 * Get a socket option on an socket.
2496 *
2497 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2498 * asynchronous errors should be reported by getsockopt. We assume
2499 * this means if you specify SO_ERROR (otherwise whats the point of it).
2500 */
2501int sock_common_getsockopt(struct socket *sock, int level, int optname,
2502 char __user *optval, int __user *optlen)
2503{
2504 struct sock *sk = sock->sk;
2505
2506 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2507}
1da177e4
LT		 2508EXPORT_SYMBOL(sock_common_getsockopt);
2509
3fdadf7d 2510#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2511int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2512 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2513{
2514 struct sock *sk = sock->sk;
2515
1e51f951 2516 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2517 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2518 optval, optlen);
3fdadf7d
DM		 2519 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2520}
2521EXPORT_SYMBOL(compat_sock_common_getsockopt);
2522#endif
2523
1da177e4
LT		 2524int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2525 struct msghdr *msg, size_t size, int flags)
2526{
2527 struct sock *sk = sock->sk;
2528 int addr_len = 0;
2529 int err;
2530
2531 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2532 flags & ~MSG_DONTWAIT, &addr_len);
2533 if (err >= 0)
2534 msg->msg_namelen = addr_len;
2535 return err;
2536}
1da177e4
LT		 2537EXPORT_SYMBOL(sock_common_recvmsg);
2538
2539/*
2540 * Set socket options on an inet socket.
2541 */
2542int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2543 char __user *optval, unsigned int optlen)
1da177e4
LT		 2544{
2545 struct sock *sk = sock->sk;
2546
2547 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2548}
1da177e4
LT		 2549EXPORT_SYMBOL(sock_common_setsockopt);
2550
3fdadf7d 2551#ifdef CONFIG_COMPAT
543d9cfe 2552int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2553 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2554{
2555 struct sock *sk = sock->sk;
2556
543d9cfe
ACM		 2557 if (sk->sk_prot->compat_setsockopt != NULL)
2558 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2559 optval, optlen);
3fdadf7d
DM		 2560 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2561}
2562EXPORT_SYMBOL(compat_sock_common_setsockopt);
2563#endif
2564
1da177e4
LT		 2565void sk_common_release(struct sock *sk)
2566{
2567 if (sk->sk_prot->destroy)
2568 sk->sk_prot->destroy(sk);
2569
2570 /*
2571 * Observation: when sock_common_release is called, processes have
2572 * no access to socket. But net still has.
2573 * Step one, detach it from networking:
2574 *
2575 * A. Remove from hash tables.
2576 */
2577
2578 sk->sk_prot->unhash(sk);
2579
2580 /*
2581 * In this point socket cannot receive new packets, but it is possible
2582 * that some packets are in flight because some CPU runs receiver and
2583 * did hash table lookup before we unhashed socket. They will achieve
2584 * receive queue and will be purged by socket destructor.
2585 *
2586 * Also we still have packets pending on receive queue and probably,
2587 * our own packets waiting in device queues. sock_destroy will drain
2588 * receive queue, but transmitted packets will delay socket destruction
2589 * until the last reference will be released.
2590 */
2591
2592 sock_orphan(sk);
2593
2594 xfrm_sk_free_policy(sk);
2595
e6848976 2596 sk_refcnt_debug_release(sk);
5640f768
ED		 2597
2598 if (sk->sk_frag.page) {
2599 put_page(sk->sk_frag.page);
2600 sk->sk_frag.page = NULL;
2601 }
2602
1da177e4
LT		 2603 sock_put(sk);
2604}
1da177e4
LT		 2605EXPORT_SYMBOL(sk_common_release);
2606
13ff3d6f
PE		 2607#ifdef CONFIG_PROC_FS
2608#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2609struct prot_inuse {
2610 int val[PROTO_INUSE_NR];
2611};
13ff3d6f
PE		 2612
2613static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2614
2615#ifdef CONFIG_NET_NS
2616void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2617{
d6d9ca0f 2618 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2619}
2620EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2621
2622int sock_prot_inuse_get(struct net *net, struct proto *prot)
2623{
2624 int cpu, idx = prot->inuse_idx;
2625 int res = 0;
2626
2627 for_each_possible_cpu(cpu)
2628 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2629
2630 return res >= 0 ? res : 0;
2631}
2632EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2633
2c8c1e72 2634static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2635{
2636 net->core.inuse = alloc_percpu(struct prot_inuse);
2637 return net->core.inuse ? 0 : -ENOMEM;
2638}
2639
2c8c1e72 2640static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2641{
2642 free_percpu(net->core.inuse);
2643}
2644
2645static struct pernet_operations net_inuse_ops = {
2646 .init = sock_inuse_init_net,
2647 .exit = sock_inuse_exit_net,
2648};
2649
2650static __init int net_inuse_init(void)
2651{
2652 if (register_pernet_subsys(&net_inuse_ops))
2653 panic("Cannot initialize net inuse counters");
2654
2655 return 0;
2656}
2657
2658core_initcall(net_inuse_init);
2659#else
1338d466
PE		 2660static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2661
c29a0bc4 2662void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2663{
d6d9ca0f 2664 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2665}
2666EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2667
c29a0bc4 2668int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2669{
2670 int cpu, idx = prot->inuse_idx;
2671 int res = 0;
2672
2673 for_each_possible_cpu(cpu)
2674 res += per_cpu(prot_inuse, cpu).val[idx];
2675
2676 return res >= 0 ? res : 0;
2677}
2678EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2679#endif
13ff3d6f
PE		 2680
2681static void assign_proto_idx(struct proto *prot)
2682{
2683 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2684
2685 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2686 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2687 return;
2688 }
2689
2690 set_bit(prot->inuse_idx, proto_inuse_idx);
2691}
2692
2693static void release_proto_idx(struct proto *prot)
2694{
2695 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2696 clear_bit(prot->inuse_idx, proto_inuse_idx);
2697}
2698#else
2699static inline void assign_proto_idx(struct proto *prot)
2700{
2701}
2702
2703static inline void release_proto_idx(struct proto *prot)
2704{
2705}
2706#endif
2707
b733c007
PE		 2708int proto_register(struct proto *prot, int alloc_slab)
2709{
1da177e4
LT		 2710 if (alloc_slab) {
2711 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2712 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2713 NULL);
1da177e4
LT		 2714
2715 if (prot->slab == NULL) {
e005d193
JP		 2716 pr_crit("%s: Can't create sock SLAB cache!\n",
2717 prot->name);
60e7663d 2718 goto out;
1da177e4 2719 }
2e6599cb
ACM		 2720
2721 if (prot->rsk_prot != NULL) {
faf23422 2722 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2723 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2724 goto out_free_sock_slab;
2725
7e56b5d6 2726 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2727 prot->rsk_prot->obj_size, 0,
20c2df83 2728 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2729
2730 if (prot->rsk_prot->slab == NULL) {
e005d193
JP		 2731 pr_crit("%s: Can't create request sock SLAB cache!\n",
2732 prot->name);
2e6599cb
ACM		 2733 goto out_free_request_sock_slab_name;
2734 }
2735 }
8feaf0c0 2736
6d6ee43e 2737 if (prot->twsk_prot != NULL) {
faf23422 2738 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2739
7e56b5d6 2740 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2741 goto out_free_request_sock_slab;
2742
6d6ee43e 2743 prot->twsk_prot->twsk_slab =
7e56b5d6 2744 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2745 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2746 0,
2747 SLAB_HWCACHE_ALIGN |
2748 prot->slab_flags,
20c2df83 2749 NULL);
6d6ee43e 2750 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2751 goto out_free_timewait_sock_slab_name;
2752 }
1da177e4
LT		 2753 }
2754
36b77a52 2755 mutex_lock(&proto_list_mutex);
1da177e4 2756 list_add(&prot->node, &proto_list);
13ff3d6f 2757 assign_proto_idx(prot);
36b77a52 2758 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2759 return 0;
2760
8feaf0c0 2761out_free_timewait_sock_slab_name:
7e56b5d6 2762 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2763out_free_request_sock_slab:
2764 if (prot->rsk_prot && prot->rsk_prot->slab) {
2765 kmem_cache_destroy(prot->rsk_prot->slab);
2766 prot->rsk_prot->slab = NULL;
2767 }
2e6599cb 2768out_free_request_sock_slab_name:
72150e9b
DC		 2769 if (prot->rsk_prot)
2770 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2771out_free_sock_slab:
2772 kmem_cache_destroy(prot->slab);
2773 prot->slab = NULL;
b733c007
PE		 2774out:
2775 return -ENOBUFS;
1da177e4 2776}
1da177e4
LT		 2777EXPORT_SYMBOL(proto_register);
2778
2779void proto_unregister(struct proto *prot)
2780{
36b77a52 2781 mutex_lock(&proto_list_mutex);
13ff3d6f 2782 release_proto_idx(prot);
0a3f4358 2783 list_del(&prot->node);
36b77a52 2784 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2785
2786 if (prot->slab != NULL) {
2787 kmem_cache_destroy(prot->slab);
2788 prot->slab = NULL;
2789 }
2790
2e6599cb 2791 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2792 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2793 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2794 prot->rsk_prot->slab = NULL;
2795 }
2796
6d6ee43e 2797 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2798 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2799 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2800 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2801 }
1da177e4 2802}
1da177e4
LT		 2803EXPORT_SYMBOL(proto_unregister);
2804
2805#ifdef CONFIG_PROC_FS
1da177e4 2806static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2807 __acquires(proto_list_mutex)
1da177e4 2808{
36b77a52 2809 mutex_lock(&proto_list_mutex);
60f0438a 2810 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2811}
2812
2813static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2814{
60f0438a 2815 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2816}
2817
2818static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2819 __releases(proto_list_mutex)
1da177e4 2820{
36b77a52 2821 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2822}
2823
2824static char proto_method_implemented(const void *method)
2825{
2826 return method == NULL ? 'n' : 'y';
2827}
180d8cd9
GC		 2828static long sock_prot_memory_allocated(struct proto *proto)
2829{
cb75a36c 2830 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2831}
2832
2833static char *sock_prot_memory_pressure(struct proto *proto)
2834{
2835 return proto->memory_pressure != NULL ?
2836 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2837}
1da177e4
LT		 2838
2839static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2840{
180d8cd9 2841
8d987e5c 2842 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2843 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2844 proto->name,
2845 proto->obj_size,
14e943db 2846 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2847 sock_prot_memory_allocated(proto),
2848 sock_prot_memory_pressure(proto),
1da177e4
LT		 2849 proto->max_header,
2850 proto->slab == NULL ? "no" : "yes",
2851 module_name(proto->owner),
2852 proto_method_implemented(proto->close),
2853 proto_method_implemented(proto->connect),
2854 proto_method_implemented(proto->disconnect),
2855 proto_method_implemented(proto->accept),
2856 proto_method_implemented(proto->ioctl),
2857 proto_method_implemented(proto->init),
2858 proto_method_implemented(proto->destroy),
2859 proto_method_implemented(proto->shutdown),
2860 proto_method_implemented(proto->setsockopt),
2861 proto_method_implemented(proto->getsockopt),
2862 proto_method_implemented(proto->sendmsg),
2863 proto_method_implemented(proto->recvmsg),
2864 proto_method_implemented(proto->sendpage),
2865 proto_method_implemented(proto->bind),
2866 proto_method_implemented(proto->backlog_rcv),
2867 proto_method_implemented(proto->hash),
2868 proto_method_implemented(proto->unhash),
2869 proto_method_implemented(proto->get_port),
2870 proto_method_implemented(proto->enter_memory_pressure));
2871}
2872
2873static int proto_seq_show(struct seq_file *seq, void *v)
2874{
60f0438a 2875 if (v == &proto_list)
1da177e4
LT		 2876 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2877 "protocol",
2878 "size",
2879 "sockets",
2880 "memory",
2881 "press",
2882 "maxhdr",
2883 "slab",
2884 "module",
2885 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2886 else
60f0438a 2887 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2888 return 0;
2889}
2890
f690808e 2891static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2892 .start = proto_seq_start,
2893 .next = proto_seq_next,
2894 .stop = proto_seq_stop,
2895 .show = proto_seq_show,
2896};
2897
2898static int proto_seq_open(struct inode *inode, struct file *file)
2899{
14e943db
ED		 2900 return seq_open_net(inode, file, &proto_seq_ops,
2901 sizeof(struct seq_net_private));
1da177e4
LT		 2902}
2903
9a32144e 2904static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2905 .owner = THIS_MODULE,
2906 .open = proto_seq_open,
2907 .read = seq_read,
2908 .llseek = seq_lseek,
14e943db
ED		 2909 .release = seq_release_net,
2910};
2911
2912static __net_init int proto_init_net(struct net *net)
2913{
d4beaa66 2914 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 2915 return -ENOMEM;
2916
2917 return 0;
2918}
2919
2920static __net_exit void proto_exit_net(struct net *net)
2921{
ece31ffd 2922 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 2923}
2924
2925
2926static __net_initdata struct pernet_operations proto_net_ops = {
2927 .init = proto_init_net,
2928 .exit = proto_exit_net,
1da177e4
LT		 2929};
2930
2931static int __init proto_init(void)
2932{
14e943db 2933 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2934}
2935
2936subsys_initcall(proto_init);
2937
2938#endif /* PROC_FS */
Linux 6.x block layer and io_uring tree(s)