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net: proc: remove proc_net_fops_create
[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
LT		 95#include <linux/errno.h>
96#include <linux/types.h>
97#include <linux/socket.h>
98#include <linux/in.h>
99#include <linux/kernel.h>
1da177e4
LT		 100#include <linux/module.h>
101#include <linux/proc_fs.h>
102#include <linux/seq_file.h>
103#include <linux/sched.h>
104#include <linux/timer.h>
105#include <linux/string.h>
106#include <linux/sockios.h>
107#include <linux/net.h>
108#include <linux/mm.h>
109#include <linux/slab.h>
110#include <linux/interrupt.h>
111#include <linux/poll.h>
112#include <linux/tcp.h>
113#include <linux/init.h>
a1f8e7f7 114#include <linux/highmem.h>
3f551f94 115#include <linux/user_namespace.h>
c5905afb 116#include <linux/static_key.h>
3969eb38 117#include <linux/memcontrol.h>
8c1ae10d 118#include <linux/prefetch.h>
1da177e4
LT		 119
120#include <asm/uaccess.h>
1da177e4
LT		 121
122#include <linux/netdevice.h>
123#include <net/protocol.h>
124#include <linux/skbuff.h>
457c4cbc 125#include <net/net_namespace.h>
2e6599cb 126#include <net/request_sock.h>
1da177e4 127#include <net/sock.h>
20d49473 128#include <linux/net_tstamp.h>
1da177e4
LT		 129#include <net/xfrm.h>
130#include <linux/ipsec.h>
f8451725 131#include <net/cls_cgroup.h>
5bc1421e 132#include <net/netprio_cgroup.h>
1da177e4
LT		 133
134#include <linux/filter.h>
135
3847ce32
SM		 136#include <trace/events/sock.h>
137
1da177e4
LT		 138#ifdef CONFIG_INET
139#include <net/tcp.h>
140#endif
141
36b77a52 142static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 143static LIST_HEAD(proto_list);
144
c255a458 145#ifdef CONFIG_MEMCG_KMEM
1d62e436 146int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
d1a4c0b3
GC		 147{
148 struct proto *proto;
149 int ret = 0;
150
36b77a52 151 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 152 list_for_each_entry(proto, &proto_list, node) {
153 if (proto->init_cgroup) {
1d62e436 154 ret = proto->init_cgroup(memcg, ss);
d1a4c0b3
GC		 155 if (ret)
156 goto out;
157 }
158 }
159
36b77a52 160 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 161 return ret;
162out:
163 list_for_each_entry_continue_reverse(proto, &proto_list, node)
164 if (proto->destroy_cgroup)
1d62e436 165 proto->destroy_cgroup(memcg);
36b77a52 166 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 167 return ret;
168}
169
1d62e436 170void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
d1a4c0b3
GC		 171{
172 struct proto *proto;
173
36b77a52 174 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 175 list_for_each_entry_reverse(proto, &proto_list, node)
176 if (proto->destroy_cgroup)
1d62e436 177 proto->destroy_cgroup(memcg);
36b77a52 178 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 179}
180#endif
181
da21f24d
IM		 182/*
183 * Each address family might have different locking rules, so we have
184 * one slock key per address family:
185 */
a5b5bb9a
IM		 186static struct lock_class_key af_family_keys[AF_MAX];
187static struct lock_class_key af_family_slock_keys[AF_MAX];
188
c5905afb 189struct static_key memcg_socket_limit_enabled;
e1aab161
GC		 190EXPORT_SYMBOL(memcg_socket_limit_enabled);
191
a5b5bb9a
IM		 192/*
193 * Make lock validator output more readable. (we pre-construct these
194 * strings build-time, so that runtime initialization of socket
195 * locks is fast):
196 */
36cbd3dc 197static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 198 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
199 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
200 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
201 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
202 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
203 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
204 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 205 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 206 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 207 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 208 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 209 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 210 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
c7fe3b52 211 "sk_lock-AF_NFC" , "sk_lock-AF_MAX"
a5b5bb9a 212};
36cbd3dc 213static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 214 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
215 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
216 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
217 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
218 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
219 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
220 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 221 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 222 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 223 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 224 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 225 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 226 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
c7fe3b52 227 "slock-AF_NFC" , "slock-AF_MAX"
a5b5bb9a 228};
36cbd3dc 229static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 230 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
231 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
232 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
233 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
234 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
235 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
236 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 237 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 238 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 239 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 240 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 241 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 242 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
c7fe3b52 243 "clock-AF_NFC" , "clock-AF_MAX"
443aef0e 244};
da21f24d
IM		 245
246/*
247 * sk_callback_lock locking rules are per-address-family,
248 * so split the lock classes by using a per-AF key:
249 */
250static struct lock_class_key af_callback_keys[AF_MAX];
251
1da177e4
LT		 252/* Take into consideration the size of the struct sk_buff overhead in the
253 * determination of these values, since that is non-constant across
254 * platforms. This makes socket queueing behavior and performance
255 * not depend upon such differences.
256 */
257#define _SK_MEM_PACKETS 256
87fb4b7b 258#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 259#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
260#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
261
262/* Run time adjustable parameters. */
ab32ea5d 263__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 264EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 265__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 266EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 267__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
268__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 269
25985edc 270/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 271int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 272EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 273
c93bdd0e
MG		 274struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
275EXPORT_SYMBOL_GPL(memalloc_socks);
276
7cb02404
MG		 277/**
278 * sk_set_memalloc - sets %SOCK_MEMALLOC
279 * @sk: socket to set it on
280 *
281 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
282 * It's the responsibility of the admin to adjust min_free_kbytes
283 * to meet the requirements
284 */
285void sk_set_memalloc(struct sock *sk)
286{
287 sock_set_flag(sk, SOCK_MEMALLOC);
288 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 289 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 290}
291EXPORT_SYMBOL_GPL(sk_set_memalloc);
292
293void sk_clear_memalloc(struct sock *sk)
294{
295 sock_reset_flag(sk, SOCK_MEMALLOC);
296 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 297 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 298
299 /*
300 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
301 * progress of swapping. However, if SOCK_MEMALLOC is cleared while
302 * it has rmem allocations there is a risk that the user of the
303 * socket cannot make forward progress due to exceeding the rmem
304 * limits. By rights, sk_clear_memalloc() should only be called
305 * on sockets being torn down but warn and reset the accounting if
306 * that assumption breaks.
307 */
308 if (WARN_ON(sk->sk_forward_alloc))
309 sk_mem_reclaim(sk);
7cb02404
MG		 310}
311EXPORT_SYMBOL_GPL(sk_clear_memalloc);
312
b4b9e355
MG		 313int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
314{
315 int ret;
316 unsigned long pflags = current->flags;
317
318 /* these should have been dropped before queueing */
319 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
320
321 current->flags |= PF_MEMALLOC;
322 ret = sk->sk_backlog_rcv(sk, skb);
323 tsk_restore_flags(current, pflags, PF_MEMALLOC);
324
325 return ret;
326}
327EXPORT_SYMBOL(__sk_backlog_rcv);
328
1da177e4
LT		 329static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
330{
331 struct timeval tv;
332
333 if (optlen < sizeof(tv))
334 return -EINVAL;
335 if (copy_from_user(&tv, optval, sizeof(tv)))
336 return -EFAULT;
ba78073e
VA		 337 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
338 return -EDOM;
1da177e4 339
ba78073e 340 if (tv.tv_sec < 0) {
6f11df83
AM		 341 static int warned __read_mostly;
342
ba78073e 343 *timeo_p = 0;
50aab54f 344 if (warned < 10 && net_ratelimit()) {
ba78073e 345 warned++;
e005d193
JP		 346 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
347 __func__, current->comm, task_pid_nr(current));
50aab54f 348 }
ba78073e
VA		 349 return 0;
350 }
1da177e4
LT		 351 *timeo_p = MAX_SCHEDULE_TIMEOUT;
352 if (tv.tv_sec == 0 && tv.tv_usec == 0)
353 return 0;
354 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
355 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
356 return 0;
357}
358
359static void sock_warn_obsolete_bsdism(const char *name)
360{
361 static int warned;
362 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 363 if (strcmp(warncomm, current->comm) && warned < 5) {
364 strcpy(warncomm, current->comm);
e005d193
JP		 365 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
366 warncomm, name);
1da177e4
LT		 367 warned++;
368 }
369}
370
08e29af3
ED		 371#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
372
373static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 374{
08e29af3
ED		 375 if (sk->sk_flags & flags) {
376 sk->sk_flags &= ~flags;
377 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 378 net_disable_timestamp();
1da177e4
LT		 379 }
380}
381
382
f0088a50
DV		 383int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
384{
766e9037 385 int err;
f0088a50 386 int skb_len;
3b885787
NH		 387 unsigned long flags;
388 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 389
0fd7bac6 390 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 391 atomic_inc(&sk->sk_drops);
3847ce32 392 trace_sock_rcvqueue_full(sk, skb);
766e9037 393 return -ENOMEM;
f0088a50
DV		 394 }
395
fda9ef5d 396 err = sk_filter(sk, skb);
f0088a50 397 if (err)
766e9037 398 return err;
f0088a50 399
c76562b6 400 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 401 atomic_inc(&sk->sk_drops);
402 return -ENOBUFS;
3ab224be
HA		 403 }
404
f0088a50
DV		 405 skb->dev = NULL;
406 skb_set_owner_r(skb, sk);
49ad9599 407
f0088a50
DV		 408 /* Cache the SKB length before we tack it onto the receive
409 * queue. Once it is added it no longer belongs to us and
410 * may be freed by other threads of control pulling packets
411 * from the queue.
412 */
413 skb_len = skb->len;
414
7fee226a
ED		 415 /* we escape from rcu protected region, make sure we dont leak
416 * a norefcounted dst
417 */
418 skb_dst_force(skb);
419
3b885787
NH		 420 spin_lock_irqsave(&list->lock, flags);
421 skb->dropcount = atomic_read(&sk->sk_drops);
422 __skb_queue_tail(list, skb);
423 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 424
425 if (!sock_flag(sk, SOCK_DEAD))
426 sk->sk_data_ready(sk, skb_len);
766e9037 427 return 0;
f0088a50
DV		 428}
429EXPORT_SYMBOL(sock_queue_rcv_skb);
430
58a5a7b9 431int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 432{
433 int rc = NET_RX_SUCCESS;
434
fda9ef5d 435 if (sk_filter(sk, skb))
f0088a50
DV		 436 goto discard_and_relse;
437
438 skb->dev = NULL;
439
f545a38f 440 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) {
c377411f
ED		 441 atomic_inc(&sk->sk_drops);
442 goto discard_and_relse;
443 }
58a5a7b9
ACM		 444 if (nested)
445 bh_lock_sock_nested(sk);
446 else
447 bh_lock_sock(sk);
a5b5bb9a
IM		 448 if (!sock_owned_by_user(sk)) {
449 /*
450 * trylock + unlock semantics:
451 */
452 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
453
c57943a1 454 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 455
456 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 457 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 458 bh_unlock_sock(sk);
459 atomic_inc(&sk->sk_drops);
460 goto discard_and_relse;
461 }
462
f0088a50
DV		 463 bh_unlock_sock(sk);
464out:
465 sock_put(sk);
466 return rc;
467discard_and_relse:
468 kfree_skb(skb);
469 goto out;
470}
471EXPORT_SYMBOL(sk_receive_skb);
472
ea94ff3b
KK		 473void sk_reset_txq(struct sock *sk)
474{
475 sk_tx_queue_clear(sk);
476}
477EXPORT_SYMBOL(sk_reset_txq);
478
f0088a50
DV		 479struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
480{
b6c6712a 481 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 482
483 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 484 sk_tx_queue_clear(sk);
a9b3cd7f 485 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 486 dst_release(dst);
487 return NULL;
488 }
489
490 return dst;
491}
492EXPORT_SYMBOL(__sk_dst_check);
493
494struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
495{
496 struct dst_entry *dst = sk_dst_get(sk);
497
498 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
499 sk_dst_reset(sk);
500 dst_release(dst);
501 return NULL;
502 }
503
504 return dst;
505}
506EXPORT_SYMBOL(sk_dst_check);
507
c91f6df2
BH		 508static int sock_setbindtodevice(struct sock *sk, char __user *optval,
509 int optlen)
4878809f
DM		 510{
511 int ret = -ENOPROTOOPT;
512#ifdef CONFIG_NETDEVICES
3b1e0a65 513 struct net *net = sock_net(sk);
4878809f
DM		 514 char devname[IFNAMSIZ];
515 int index;
516
517 /* Sorry... */
518 ret = -EPERM;
5e1fccc0 519 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 520 goto out;
521
522 ret = -EINVAL;
523 if (optlen < 0)
524 goto out;
525
526 /* Bind this socket to a particular device like "eth0",
527 * as specified in the passed interface name. If the
528 * name is "" or the option length is zero the socket
529 * is not bound.
530 */
531 if (optlen > IFNAMSIZ - 1)
532 optlen = IFNAMSIZ - 1;
533 memset(devname, 0, sizeof(devname));
534
535 ret = -EFAULT;
536 if (copy_from_user(devname, optval, optlen))
537 goto out;
538
000ba2e4
DM		 539 index = 0;
540 if (devname[0] != '\0') {
bf8e56bf 541 struct net_device *dev;
4878809f 542
bf8e56bf
ED		 543 rcu_read_lock();
544 dev = dev_get_by_name_rcu(net, devname);
545 if (dev)
546 index = dev->ifindex;
547 rcu_read_unlock();
4878809f
DM		 548 ret = -ENODEV;
549 if (!dev)
550 goto out;
4878809f
DM		 551 }
552
553 lock_sock(sk);
554 sk->sk_bound_dev_if = index;
555 sk_dst_reset(sk);
556 release_sock(sk);
557
558 ret = 0;
559
560out:
561#endif
562
563 return ret;
564}
565
c91f6df2
BH		 566static int sock_getbindtodevice(struct sock *sk, char __user *optval,
567 int __user *optlen, int len)
568{
569 int ret = -ENOPROTOOPT;
570#ifdef CONFIG_NETDEVICES
571 struct net *net = sock_net(sk);
572 struct net_device *dev;
573 char devname[IFNAMSIZ];
574 unsigned seq;
575
576 if (sk->sk_bound_dev_if == 0) {
577 len = 0;
578 goto zero;
579 }
580
581 ret = -EINVAL;
582 if (len < IFNAMSIZ)
583 goto out;
584
585retry:
30e6c9fa 586 seq = read_seqcount_begin(&devnet_rename_seq);
c91f6df2
BH		 587 rcu_read_lock();
588 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
589 ret = -ENODEV;
590 if (!dev) {
591 rcu_read_unlock();
592 goto out;
593 }
594
595 strcpy(devname, dev->name);
596 rcu_read_unlock();
30e6c9fa 597 if (read_seqcount_retry(&devnet_rename_seq, seq))
c91f6df2
BH		 598 goto retry;
599
600 len = strlen(devname) + 1;
601
602 ret = -EFAULT;
603 if (copy_to_user(optval, devname, len))
604 goto out;
605
606zero:
607 ret = -EFAULT;
608 if (put_user(len, optlen))
609 goto out;
610
611 ret = 0;
612
613out:
614#endif
615
616 return ret;
617}
618
c0ef877b
PE		 619static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
620{
621 if (valbool)
622 sock_set_flag(sk, bit);
623 else
624 sock_reset_flag(sk, bit);
625}
626
1da177e4
LT		 627/*
628 * This is meant for all protocols to use and covers goings on
629 * at the socket level. Everything here is generic.
630 */
631
632int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 633 char __user *optval, unsigned int optlen)
1da177e4 634{
2a91525c 635 struct sock *sk = sock->sk;
1da177e4
LT		 636 int val;
637 int valbool;
638 struct linger ling;
639 int ret = 0;
4ec93edb 640
1da177e4
LT		 641 /*
642 * Options without arguments
643 */
644
4878809f 645 if (optname == SO_BINDTODEVICE)
c91f6df2 646 return sock_setbindtodevice(sk, optval, optlen);
4878809f 647
e71a4783
SH		 648 if (optlen < sizeof(int))
649 return -EINVAL;
4ec93edb 650
1da177e4
LT		 651 if (get_user(val, (int __user *)optval))
652 return -EFAULT;
4ec93edb 653
2a91525c 654 valbool = val ? 1 : 0;
1da177e4
LT		 655
656 lock_sock(sk);
657
2a91525c 658 switch (optname) {
e71a4783 659 case SO_DEBUG:
2a91525c 660 if (val && !capable(CAP_NET_ADMIN))
e71a4783 661 ret = -EACCES;
2a91525c 662 else
c0ef877b 663 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 664 break;
665 case SO_REUSEADDR:
4a17fd52 666 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 667 break;
055dc21a
TH		 668 case SO_REUSEPORT:
669 sk->sk_reuseport = valbool;
670 break;
e71a4783 671 case SO_TYPE:
49c794e9 672 case SO_PROTOCOL:
0d6038ee 673 case SO_DOMAIN:
e71a4783
SH		 674 case SO_ERROR:
675 ret = -ENOPROTOOPT;
676 break;
677 case SO_DONTROUTE:
c0ef877b 678 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 679 break;
680 case SO_BROADCAST:
681 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
682 break;
683 case SO_SNDBUF:
684 /* Don't error on this BSD doesn't and if you think
82981930
ED		 685 * about it this is right. Otherwise apps have to
686 * play 'guess the biggest size' games. RCVBUF/SNDBUF
687 * are treated in BSD as hints
688 */
689 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 690set_sndbuf:
e71a4783 691 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 692 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
693 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 694 sk->sk_write_space(sk);
695 break;
1da177e4 696
e71a4783
SH		 697 case SO_SNDBUFFORCE:
698 if (!capable(CAP_NET_ADMIN)) {
699 ret = -EPERM;
700 break;
701 }
702 goto set_sndbuf;
b0573dea 703
e71a4783
SH		 704 case SO_RCVBUF:
705 /* Don't error on this BSD doesn't and if you think
82981930
ED		 706 * about it this is right. Otherwise apps have to
707 * play 'guess the biggest size' games. RCVBUF/SNDBUF
708 * are treated in BSD as hints
709 */
710 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 711set_rcvbuf:
e71a4783
SH		 712 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
713 /*
714 * We double it on the way in to account for
715 * "struct sk_buff" etc. overhead. Applications
716 * assume that the SO_RCVBUF setting they make will
717 * allow that much actual data to be received on that
718 * socket.
719 *
720 * Applications are unaware that "struct sk_buff" and
721 * other overheads allocate from the receive buffer
722 * during socket buffer allocation.
723 *
724 * And after considering the possible alternatives,
725 * returning the value we actually used in getsockopt
726 * is the most desirable behavior.
727 */
82981930 728 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 729 break;
730
731 case SO_RCVBUFFORCE:
732 if (!capable(CAP_NET_ADMIN)) {
733 ret = -EPERM;
1da177e4 734 break;
e71a4783
SH		 735 }
736 goto set_rcvbuf;
1da177e4 737
e71a4783 738 case SO_KEEPALIVE:
1da177e4 739#ifdef CONFIG_INET
3e10986d
ED		 740 if (sk->sk_protocol == IPPROTO_TCP &&
741 sk->sk_type == SOCK_STREAM)
e71a4783 742 tcp_set_keepalive(sk, valbool);
1da177e4 743#endif
e71a4783
SH		 744 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
745 break;
746
747 case SO_OOBINLINE:
748 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
749 break;
750
751 case SO_NO_CHECK:
752 sk->sk_no_check = valbool;
753 break;
754
755 case SO_PRIORITY:
5e1fccc0
EB		 756 if ((val >= 0 && val <= 6) ||
757 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 758 sk->sk_priority = val;
759 else
760 ret = -EPERM;
761 break;
762
763 case SO_LINGER:
764 if (optlen < sizeof(ling)) {
765 ret = -EINVAL; /* 1003.1g */
1da177e4 766 break;
e71a4783 767 }
2a91525c 768 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 769 ret = -EFAULT;
1da177e4 770 break;
e71a4783
SH		 771 }
772 if (!ling.l_onoff)
773 sock_reset_flag(sk, SOCK_LINGER);
774 else {
1da177e4 775#if (BITS_PER_LONG == 32)
e71a4783
SH		 776 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
777 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 778 else
e71a4783
SH		 779#endif
780 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
781 sock_set_flag(sk, SOCK_LINGER);
782 }
783 break;
784
785 case SO_BSDCOMPAT:
786 sock_warn_obsolete_bsdism("setsockopt");
787 break;
788
789 case SO_PASSCRED:
790 if (valbool)
791 set_bit(SOCK_PASSCRED, &sock->flags);
792 else
793 clear_bit(SOCK_PASSCRED, &sock->flags);
794 break;
795
796 case SO_TIMESTAMP:
92f37fd2 797 case SO_TIMESTAMPNS:
e71a4783 798 if (valbool) {
92f37fd2
ED		 799 if (optname == SO_TIMESTAMP)
800 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
801 else
802 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 803 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 804 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 805 } else {
e71a4783 806 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 807 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
808 }
e71a4783
SH		 809 break;
810
20d49473
PO		 811 case SO_TIMESTAMPING:
812 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 813 ret = -EINVAL;
20d49473
PO		 814 break;
815 }
816 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
817 val & SOF_TIMESTAMPING_TX_HARDWARE);
818 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
819 val & SOF_TIMESTAMPING_TX_SOFTWARE);
820 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
821 val & SOF_TIMESTAMPING_RX_HARDWARE);
822 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
823 sock_enable_timestamp(sk,
824 SOCK_TIMESTAMPING_RX_SOFTWARE);
825 else
826 sock_disable_timestamp(sk,
08e29af3 827 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 828 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
829 val & SOF_TIMESTAMPING_SOFTWARE);
830 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
831 val & SOF_TIMESTAMPING_SYS_HARDWARE);
832 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
833 val & SOF_TIMESTAMPING_RAW_HARDWARE);
834 break;
835
e71a4783
SH		 836 case SO_RCVLOWAT:
837 if (val < 0)
838 val = INT_MAX;
839 sk->sk_rcvlowat = val ? : 1;
840 break;
841
842 case SO_RCVTIMEO:
843 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
844 break;
845
846 case SO_SNDTIMEO:
847 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
848 break;
1da177e4 849
e71a4783
SH		 850 case SO_ATTACH_FILTER:
851 ret = -EINVAL;
852 if (optlen == sizeof(struct sock_fprog)) {
853 struct sock_fprog fprog;
1da177e4 854
e71a4783
SH		 855 ret = -EFAULT;
856 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 857 break;
e71a4783
SH		 858
859 ret = sk_attach_filter(&fprog, sk);
860 }
861 break;
862
863 case SO_DETACH_FILTER:
55b33325 864 ret = sk_detach_filter(sk);
e71a4783 865 break;
1da177e4 866
d59577b6
VB		 867 case SO_LOCK_FILTER:
868 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
869 ret = -EPERM;
870 else
871 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
872 break;
873
e71a4783
SH		 874 case SO_PASSSEC:
875 if (valbool)
876 set_bit(SOCK_PASSSEC, &sock->flags);
877 else
878 clear_bit(SOCK_PASSSEC, &sock->flags);
879 break;
4a19ec58 880 case SO_MARK:
5e1fccc0 881 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 882 ret = -EPERM;
2a91525c 883 else
4a19ec58 884 sk->sk_mark = val;
4a19ec58 885 break;
877ce7c1 886
1da177e4
LT		 887 /* We implement the SO_SNDLOWAT etc to
888 not be settable (1003.1g 5.3) */
3b885787 889 case SO_RXQ_OVFL:
8083f0fc 890 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 891 break;
6e3e939f
JB		 892
893 case SO_WIFI_STATUS:
894 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
895 break;
896
ef64a54f
PE		 897 case SO_PEEK_OFF:
898 if (sock->ops->set_peek_off)
899 sock->ops->set_peek_off(sk, val);
900 else
901 ret = -EOPNOTSUPP;
902 break;
3bdc0eba
BG		 903
904 case SO_NOFCS:
905 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
906 break;
907
e71a4783
SH		 908 default:
909 ret = -ENOPROTOOPT;
910 break;
4ec93edb 911 }
1da177e4
LT		 912 release_sock(sk);
913 return ret;
914}
2a91525c 915EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 916
917
3f551f94
EB		 918void cred_to_ucred(struct pid *pid, const struct cred *cred,
919 struct ucred *ucred)
920{
921 ucred->pid = pid_vnr(pid);
922 ucred->uid = ucred->gid = -1;
923 if (cred) {
924 struct user_namespace *current_ns = current_user_ns();
925
b2e4f544
EB		 926 ucred->uid = from_kuid_munged(current_ns, cred->euid);
927 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 928 }
929}
3924773a 930EXPORT_SYMBOL_GPL(cred_to_ucred);
3f551f94 931
1da177e4
LT		 932int sock_getsockopt(struct socket *sock, int level, int optname,
933 char __user *optval, int __user *optlen)
934{
935 struct sock *sk = sock->sk;
4ec93edb 936
e71a4783 937 union {
4ec93edb
YH		 938 int val;
939 struct linger ling;
1da177e4
LT		 940 struct timeval tm;
941 } v;
4ec93edb 942
4d0392be 943 int lv = sizeof(int);
1da177e4 944 int len;
4ec93edb 945
e71a4783 946 if (get_user(len, optlen))
4ec93edb 947 return -EFAULT;
e71a4783 948 if (len < 0)
1da177e4 949 return -EINVAL;
4ec93edb 950
50fee1de 951 memset(&v, 0, sizeof(v));
df0bca04 952
2a91525c 953 switch (optname) {
e71a4783
SH		 954 case SO_DEBUG:
955 v.val = sock_flag(sk, SOCK_DBG);
956 break;
957
958 case SO_DONTROUTE:
959 v.val = sock_flag(sk, SOCK_LOCALROUTE);
960 break;
961
962 case SO_BROADCAST:
1b23a5df 963 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 964 break;
965
966 case SO_SNDBUF:
967 v.val = sk->sk_sndbuf;
968 break;
969
970 case SO_RCVBUF:
971 v.val = sk->sk_rcvbuf;
972 break;
973
974 case SO_REUSEADDR:
975 v.val = sk->sk_reuse;
976 break;
977
055dc21a
TH		 978 case SO_REUSEPORT:
979 v.val = sk->sk_reuseport;
980 break;
981
e71a4783 982 case SO_KEEPALIVE:
1b23a5df 983 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 984 break;
985
986 case SO_TYPE:
987 v.val = sk->sk_type;
988 break;
989
49c794e9
JE		 990 case SO_PROTOCOL:
991 v.val = sk->sk_protocol;
992 break;
993
0d6038ee
JE		 994 case SO_DOMAIN:
995 v.val = sk->sk_family;
996 break;
997
e71a4783
SH		 998 case SO_ERROR:
999 v.val = -sock_error(sk);
2a91525c 1000 if (v.val == 0)
e71a4783
SH		 1001 v.val = xchg(&sk->sk_err_soft, 0);
1002 break;
1003
1004 case SO_OOBINLINE:
1b23a5df 1005 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1006 break;
1007
1008 case SO_NO_CHECK:
1009 v.val = sk->sk_no_check;
1010 break;
1011
1012 case SO_PRIORITY:
1013 v.val = sk->sk_priority;
1014 break;
1015
1016 case SO_LINGER:
1017 lv = sizeof(v.ling);
1b23a5df 1018 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1019 v.ling.l_linger = sk->sk_lingertime / HZ;
1020 break;
1021
1022 case SO_BSDCOMPAT:
1023 sock_warn_obsolete_bsdism("getsockopt");
1024 break;
1025
1026 case SO_TIMESTAMP:
92f37fd2
ED		 1027 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1028 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1029 break;
1030
1031 case SO_TIMESTAMPNS:
1032 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1033 break;
1034
20d49473
PO		 1035 case SO_TIMESTAMPING:
1036 v.val = 0;
1037 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
1038 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
1039 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
1040 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
1041 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
1042 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
1043 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1044 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
1045 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
1046 v.val |= SOF_TIMESTAMPING_SOFTWARE;
1047 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
1048 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
1049 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
1050 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
1051 break;
1052
e71a4783 1053 case SO_RCVTIMEO:
2a91525c 1054 lv = sizeof(struct timeval);
e71a4783
SH		 1055 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1056 v.tm.tv_sec = 0;
1057 v.tm.tv_usec = 0;
1058 } else {
1059 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1060 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1061 }
1062 break;
1063
1064 case SO_SNDTIMEO:
2a91525c 1065 lv = sizeof(struct timeval);
e71a4783
SH		 1066 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1067 v.tm.tv_sec = 0;
1068 v.tm.tv_usec = 0;
1069 } else {
1070 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1071 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1072 }
1073 break;
1da177e4 1074
e71a4783
SH		 1075 case SO_RCVLOWAT:
1076 v.val = sk->sk_rcvlowat;
1077 break;
1da177e4 1078
e71a4783 1079 case SO_SNDLOWAT:
2a91525c 1080 v.val = 1;
e71a4783 1081 break;
1da177e4 1082
e71a4783 1083 case SO_PASSCRED:
82981930 1084 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1085 break;
1da177e4 1086
e71a4783 1087 case SO_PEERCRED:
109f6e39
EB		 1088 {
1089 struct ucred peercred;
1090 if (len > sizeof(peercred))
1091 len = sizeof(peercred);
1092 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1093 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1094 return -EFAULT;
1095 goto lenout;
109f6e39 1096 }
1da177e4 1097
e71a4783
SH		 1098 case SO_PEERNAME:
1099 {
1100 char address[128];
1101
1102 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1103 return -ENOTCONN;
1104 if (lv < len)
1105 return -EINVAL;
1106 if (copy_to_user(optval, address, len))
1107 return -EFAULT;
1108 goto lenout;
1109 }
1da177e4 1110
e71a4783
SH		 1111 /* Dubious BSD thing... Probably nobody even uses it, but
1112 * the UNIX standard wants it for whatever reason... -DaveM
1113 */
1114 case SO_ACCEPTCONN:
1115 v.val = sk->sk_state == TCP_LISTEN;
1116 break;
1da177e4 1117
e71a4783 1118 case SO_PASSSEC:
82981930 1119 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1120 break;
877ce7c1 1121
e71a4783
SH		 1122 case SO_PEERSEC:
1123 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1124
4a19ec58
LAT		 1125 case SO_MARK:
1126 v.val = sk->sk_mark;
1127 break;
1128
3b885787 1129 case SO_RXQ_OVFL:
1b23a5df 1130 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1131 break;
1132
6e3e939f 1133 case SO_WIFI_STATUS:
1b23a5df 1134 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1135 break;
1136
ef64a54f
PE		 1137 case SO_PEEK_OFF:
1138 if (!sock->ops->set_peek_off)
1139 return -EOPNOTSUPP;
1140
1141 v.val = sk->sk_peek_off;
1142 break;
bc2f7996 1143 case SO_NOFCS:
1b23a5df 1144 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1145 break;
c91f6df2 1146
f7b86bfe 1147 case SO_BINDTODEVICE:
c91f6df2
BH		 1148 return sock_getbindtodevice(sk, optval, optlen, len);
1149
a8fc9277
PE		 1150 case SO_GET_FILTER:
1151 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1152 if (len < 0)
1153 return len;
1154
1155 goto lenout;
c91f6df2 1156
d59577b6
VB		 1157 case SO_LOCK_FILTER:
1158 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1159 break;
1160
e71a4783
SH		 1161 default:
1162 return -ENOPROTOOPT;
1da177e4 1163 }
e71a4783 1164
1da177e4
LT		 1165 if (len > lv)
1166 len = lv;
1167 if (copy_to_user(optval, &v, len))
1168 return -EFAULT;
1169lenout:
4ec93edb
YH		 1170 if (put_user(len, optlen))
1171 return -EFAULT;
1172 return 0;
1da177e4
LT		 1173}
1174
a5b5bb9a
IM		 1175/*
1176 * Initialize an sk_lock.
1177 *
1178 * (We also register the sk_lock with the lock validator.)
1179 */
b6f99a21 1180static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1181{
ed07536e
PZ		 1182 sock_lock_init_class_and_name(sk,
1183 af_family_slock_key_strings[sk->sk_family],
1184 af_family_slock_keys + sk->sk_family,
1185 af_family_key_strings[sk->sk_family],
1186 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1187}
1188
4dc6dc71
ED		 1189/*
1190 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1191 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1192 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1193 */
f1a6c4da
PE		 1194static void sock_copy(struct sock *nsk, const struct sock *osk)
1195{
1196#ifdef CONFIG_SECURITY_NETWORK
1197 void *sptr = nsk->sk_security;
1198#endif
68835aba
ED		 1199 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1200
1201 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1202 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1203
f1a6c4da
PE		 1204#ifdef CONFIG_SECURITY_NETWORK
1205 nsk->sk_security = sptr;
1206 security_sk_clone(osk, nsk);
1207#endif
1208}
1209
fcbdf09d
OP		 1210/*
1211 * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes
1212 * un-modified. Special care is taken when initializing object to zero.
1213 */
1214static inline void sk_prot_clear_nulls(struct sock *sk, int size)
1215{
1216 if (offsetof(struct sock, sk_node.next) != 0)
1217 memset(sk, 0, offsetof(struct sock, sk_node.next));
1218 memset(&sk->sk_node.pprev, 0,
1219 size - offsetof(struct sock, sk_node.pprev));
1220}
1221
1222void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1223{
1224 unsigned long nulls1, nulls2;
1225
1226 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1227 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1228 if (nulls1 > nulls2)
1229 swap(nulls1, nulls2);
1230
1231 if (nulls1 != 0)
1232 memset((char *)sk, 0, nulls1);
1233 memset((char *)sk + nulls1 + sizeof(void *), 0,
1234 nulls2 - nulls1 - sizeof(void *));
1235 memset((char *)sk + nulls2 + sizeof(void *), 0,
1236 size - nulls2 - sizeof(void *));
1237}
1238EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1239
2e4afe7b
PE		 1240static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1241 int family)
c308c1b2
PE		 1242{
1243 struct sock *sk;
1244 struct kmem_cache *slab;
1245
1246 slab = prot->slab;
e912b114
ED		 1247 if (slab != NULL) {
1248 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1249 if (!sk)
1250 return sk;
1251 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1252 if (prot->clear_sk)
1253 prot->clear_sk(sk, prot->obj_size);
1254 else
1255 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1256 }
fcbdf09d 1257 } else
c308c1b2
PE		 1258 sk = kmalloc(prot->obj_size, priority);
1259
2e4afe7b 1260 if (sk != NULL) {
a98b65a3
VN		 1261 kmemcheck_annotate_bitfield(sk, flags);
1262
2e4afe7b
PE		 1263 if (security_sk_alloc(sk, family, priority))
1264 goto out_free;
1265
1266 if (!try_module_get(prot->owner))
1267 goto out_free_sec;
e022f0b4 1268 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1269 }
1270
c308c1b2 1271 return sk;
2e4afe7b
PE		 1272
1273out_free_sec:
1274 security_sk_free(sk);
1275out_free:
1276 if (slab != NULL)
1277 kmem_cache_free(slab, sk);
1278 else
1279 kfree(sk);
1280 return NULL;
c308c1b2
PE		 1281}
1282
1283static void sk_prot_free(struct proto *prot, struct sock *sk)
1284{
1285 struct kmem_cache *slab;
2e4afe7b 1286 struct module *owner;
c308c1b2 1287
2e4afe7b 1288 owner = prot->owner;
c308c1b2 1289 slab = prot->slab;
2e4afe7b
PE		 1290
1291 security_sk_free(sk);
c308c1b2
PE		 1292 if (slab != NULL)
1293 kmem_cache_free(slab, sk);
1294 else
1295 kfree(sk);
2e4afe7b 1296 module_put(owner);
c308c1b2
PE		 1297}
1298
f8451725 1299#ifdef CONFIG_CGROUPS
8fb974c9 1300#if IS_ENABLED(CONFIG_NET_CLS_CGROUP)
fd9a08a7 1301void sock_update_classid(struct sock *sk, struct task_struct *task)
f8451725 1302{
1144182a 1303 u32 classid;
f8451725 1304
fd9a08a7 1305 classid = task_cls_classid(task);
3afa6d00 1306 if (classid != sk->sk_classid)
f8451725
HX		 1307 sk->sk_classid = classid;
1308}
82862742 1309EXPORT_SYMBOL(sock_update_classid);
8fb974c9 1310#endif
5bc1421e 1311
51e4e7fa 1312#if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
406a3c63 1313void sock_update_netprioidx(struct sock *sk, struct task_struct *task)
5bc1421e 1314{
5bc1421e
NH		 1315 if (in_interrupt())
1316 return;
2b73bc65 1317
406a3c63 1318 sk->sk_cgrp_prioidx = task_netprioidx(task);
5bc1421e
NH		 1319}
1320EXPORT_SYMBOL_GPL(sock_update_netprioidx);
f8451725 1321#endif
51e4e7fa 1322#endif
f8451725 1323
1da177e4
LT		 1324/**
1325 * sk_alloc - All socket objects are allocated here
c4ea43c5 1326 * @net: the applicable net namespace
4dc3b16b
PP		 1327 * @family: protocol family
1328 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1329 * @prot: struct proto associated with this new sock instance
1da177e4 1330 */
1b8d7ae4 1331struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1332 struct proto *prot)
1da177e4 1333{
c308c1b2 1334 struct sock *sk;
1da177e4 1335
154adbc8 1336 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1337 if (sk) {
154adbc8
PE		 1338 sk->sk_family = family;
1339 /*
1340 * See comment in struct sock definition to understand
1341 * why we need sk_prot_creator -acme
1342 */
1343 sk->sk_prot = sk->sk_prot_creator = prot;
1344 sock_lock_init(sk);
3b1e0a65 1345 sock_net_set(sk, get_net(net));
d66ee058 1346 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1347
fd9a08a7 1348 sock_update_classid(sk, current);
406a3c63 1349 sock_update_netprioidx(sk, current);
1da177e4 1350 }
a79af59e 1351
2e4afe7b 1352 return sk;
1da177e4 1353}
2a91525c 1354EXPORT_SYMBOL(sk_alloc);
1da177e4 1355
2b85a34e 1356static void __sk_free(struct sock *sk)
1da177e4
LT		 1357{
1358 struct sk_filter *filter;
1da177e4
LT		 1359
1360 if (sk->sk_destruct)
1361 sk->sk_destruct(sk);
1362
a898def2
PM		 1363 filter = rcu_dereference_check(sk->sk_filter,
1364 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1365 if (filter) {
309dd5fc 1366 sk_filter_uncharge(sk, filter);
a9b3cd7f 1367 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1368 }
1369
08e29af3 1370 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1371
1372 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1373 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1374 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1375
109f6e39
EB		 1376 if (sk->sk_peer_cred)
1377 put_cred(sk->sk_peer_cred);
1378 put_pid(sk->sk_peer_pid);
3b1e0a65 1379 put_net(sock_net(sk));
c308c1b2 1380 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1381}
2b85a34e
ED		 1382
1383void sk_free(struct sock *sk)
1384{
1385 /*
25985edc 1386 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1387 * some packets are still in some tx queue.
1388 * If not null, sock_wfree() will call __sk_free(sk) later
1389 */
1390 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1391 __sk_free(sk);
1392}
2a91525c 1393EXPORT_SYMBOL(sk_free);
1da177e4 1394
edf02087 1395/*
25985edc
LDM		 1396 * Last sock_put should drop reference to sk->sk_net. It has already
1397 * been dropped in sk_change_net. Taking reference to stopping namespace
edf02087 1398 * is not an option.
25985edc 1399 * Take reference to a socket to remove it from hash _alive_ and after that
edf02087
DL		 1400 * destroy it in the context of init_net.
1401 */
1402void sk_release_kernel(struct sock *sk)
1403{
1404 if (sk == NULL || sk->sk_socket == NULL)
1405 return;
1406
1407 sock_hold(sk);
1408 sock_release(sk->sk_socket);
65a18ec5 1409 release_net(sock_net(sk));
3b1e0a65 1410 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1411 sock_put(sk);
1412}
45af1754 1413EXPORT_SYMBOL(sk_release_kernel);
edf02087 1414
475f1b52
SR		 1415static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1416{
1417 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1418 sock_update_memcg(newsk);
1419}
1420
e56c57d0
ED		 1421/**
1422 * sk_clone_lock - clone a socket, and lock its clone
1423 * @sk: the socket to clone
1424 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1425 *
1426 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1427 */
1428struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1429{
8fd1d178 1430 struct sock *newsk;
87d11ceb 1431
8fd1d178 1432 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1433 if (newsk != NULL) {
1434 struct sk_filter *filter;
1435
892c141e 1436 sock_copy(newsk, sk);
87d11ceb
ACM		 1437
1438 /* SANITY */
3b1e0a65 1439 get_net(sock_net(newsk));
87d11ceb
ACM		 1440 sk_node_init(&newsk->sk_node);
1441 sock_lock_init(newsk);
1442 bh_lock_sock(newsk);
fa438ccf 1443 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1444 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1445
1446 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1447 /*
1448 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1449 */
1450 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1451 atomic_set(&newsk->sk_omem_alloc, 0);
1452 skb_queue_head_init(&newsk->sk_receive_queue);
1453 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1454#ifdef CONFIG_NET_DMA
1455 skb_queue_head_init(&newsk->sk_async_wait_queue);
1456#endif
87d11ceb 1457
b6c6712a 1458 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1459 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1460 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1461 af_callback_keys + newsk->sk_family,
1462 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1463
1464 newsk->sk_dst_cache = NULL;
1465 newsk->sk_wmem_queued = 0;
1466 newsk->sk_forward_alloc = 0;
1467 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1468 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1469
1470 sock_reset_flag(newsk, SOCK_DONE);
1471 skb_queue_head_init(&newsk->sk_error_queue);
1472
0d7da9dd 1473 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb
ACM		 1474 if (filter != NULL)
1475 sk_filter_charge(newsk, filter);
1476
1477 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1478 /* It is still raw copy of parent, so invalidate
1479 * destructor and make plain sk_free() */
1480 newsk->sk_destruct = NULL;
b0691c8e 1481 bh_unlock_sock(newsk);
87d11ceb
ACM		 1482 sk_free(newsk);
1483 newsk = NULL;
1484 goto out;
1485 }
1486
1487 newsk->sk_err = 0;
1488 newsk->sk_priority = 0;
4dc6dc71
ED		 1489 /*
1490 * Before updating sk_refcnt, we must commit prior changes to memory
1491 * (Documentation/RCU/rculist_nulls.txt for details)
1492 */
1493 smp_wmb();
87d11ceb
ACM		 1494 atomic_set(&newsk->sk_refcnt, 2);
1495
1496 /*
1497 * Increment the counter in the same struct proto as the master
1498 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1499 * is the same as sk->sk_prot->socks, as this field was copied
1500 * with memcpy).
1501 *
1502 * This _changes_ the previous behaviour, where
1503 * tcp_create_openreq_child always was incrementing the
1504 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1505 * to be taken into account in all callers. -acme
1506 */
1507 sk_refcnt_debug_inc(newsk);
972692e0 1508 sk_set_socket(newsk, NULL);
43815482 1509 newsk->sk_wq = NULL;
87d11ceb 1510
f3f511e1
GC		 1511 sk_update_clone(sk, newsk);
1512
87d11ceb 1513 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1514 sk_sockets_allocated_inc(newsk);
704da560 1515
08e29af3 1516 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1517 net_enable_timestamp();
87d11ceb
ACM		 1518 }
1519out:
1520 return newsk;
1521}
e56c57d0 1522EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1523
9958089a
AK		 1524void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1525{
1526 __sk_dst_set(sk, dst);
1527 sk->sk_route_caps = dst->dev->features;
1528 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1529 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1530 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1531 if (sk_can_gso(sk)) {
82cc1a7a 1532 if (dst->header_len) {
9958089a 1533 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1534 } else {
9958089a 1535 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1536 sk->sk_gso_max_size = dst->dev->gso_max_size;
1485348d 1537 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
82cc1a7a 1538 }
9958089a
AK		 1539 }
1540}
1541EXPORT_SYMBOL_GPL(sk_setup_caps);
1542
1da177e4
LT		 1543/*
1544 * Simple resource managers for sockets.
1545 */
1546
1547
4ec93edb
YH		 1548/*
1549 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1550 */
1551void sock_wfree(struct sk_buff *skb)
1552{
1553 struct sock *sk = skb->sk;
d99927f4 1554 unsigned int len = skb->truesize;
1da177e4 1555
d99927f4
ED		 1556 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1557 /*
1558 * Keep a reference on sk_wmem_alloc, this will be released
1559 * after sk_write_space() call
1560 */
1561 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1562 sk->sk_write_space(sk);
d99927f4
ED		 1563 len = 1;
1564 }
2b85a34e 1565 /*
d99927f4
ED		 1566 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1567 * could not do because of in-flight packets
2b85a34e 1568 */
d99927f4 1569 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1570 __sk_free(sk);
1da177e4 1571}
2a91525c 1572EXPORT_SYMBOL(sock_wfree);
1da177e4 1573
4ec93edb
YH		 1574/*
1575 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1576 */
1577void sock_rfree(struct sk_buff *skb)
1578{
1579 struct sock *sk = skb->sk;
d361fd59 1580 unsigned int len = skb->truesize;
1da177e4 1581
d361fd59
ED		 1582 atomic_sub(len, &sk->sk_rmem_alloc);
1583 sk_mem_uncharge(sk, len);
1da177e4 1584}
2a91525c 1585EXPORT_SYMBOL(sock_rfree);
1da177e4 1586
41063e9d
DM		 1587void sock_edemux(struct sk_buff *skb)
1588{
e812347c
ED		 1589 struct sock *sk = skb->sk;
1590
1c463e57 1591#ifdef CONFIG_INET
e812347c
ED		 1592 if (sk->sk_state == TCP_TIME_WAIT)
1593 inet_twsk_put(inet_twsk(sk));
1594 else
1c463e57 1595#endif
e812347c 1596 sock_put(sk);
41063e9d
DM		 1597}
1598EXPORT_SYMBOL(sock_edemux);
1da177e4 1599
976d0201 1600kuid_t sock_i_uid(struct sock *sk)
1da177e4 1601{
976d0201 1602 kuid_t uid;
1da177e4 1603
f064af1e 1604 read_lock_bh(&sk->sk_callback_lock);
976d0201 1605 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1606 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1607 return uid;
1608}
2a91525c 1609EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1610
1611unsigned long sock_i_ino(struct sock *sk)
1612{
1613 unsigned long ino;
1614
f064af1e 1615 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1616 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1617 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1618 return ino;
1619}
2a91525c 1620EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1621
1622/*
1623 * Allocate a skb from the socket's send buffer.
1624 */
86a76caf 1625struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1626 gfp_t priority)
1da177e4
LT		 1627{
1628 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1629 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1630 if (skb) {
1631 skb_set_owner_w(skb, sk);
1632 return skb;
1633 }
1634 }
1635 return NULL;
1636}
2a91525c 1637EXPORT_SYMBOL(sock_wmalloc);
1da177e4
LT		 1638
1639/*
1640 * Allocate a skb from the socket's receive buffer.
4ec93edb 1641 */
86a76caf 1642struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1643 gfp_t priority)
1da177e4
LT		 1644{
1645 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1646 struct sk_buff *skb = alloc_skb(size, priority);
1647 if (skb) {
1648 skb_set_owner_r(skb, sk);
1649 return skb;
1650 }
1651 }
1652 return NULL;
1653}
1654
4ec93edb 1655/*
1da177e4 1656 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1657 */
dd0fc66f 1658void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1659{
95c96174 1660 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1661 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1662 void *mem;
1663 /* First do the add, to avoid the race if kmalloc
4ec93edb 1664 * might sleep.
1da177e4
LT		 1665 */
1666 atomic_add(size, &sk->sk_omem_alloc);
1667 mem = kmalloc(size, priority);
1668 if (mem)
1669 return mem;
1670 atomic_sub(size, &sk->sk_omem_alloc);
1671 }
1672 return NULL;
1673}
2a91525c 1674EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1675
1676/*
1677 * Free an option memory block.
1678 */
1679void sock_kfree_s(struct sock *sk, void *mem, int size)
1680{
1681 kfree(mem);
1682 atomic_sub(size, &sk->sk_omem_alloc);
1683}
2a91525c 1684EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1685
1686/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1687 I think, these locks should be removed for datagram sockets.
1688 */
2a91525c 1689static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1690{
1691 DEFINE_WAIT(wait);
1692
1693 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1694 for (;;) {
1695 if (!timeo)
1696 break;
1697 if (signal_pending(current))
1698 break;
1699 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1700 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1701 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1702 break;
1703 if (sk->sk_shutdown & SEND_SHUTDOWN)
1704 break;
1705 if (sk->sk_err)
1706 break;
1707 timeo = schedule_timeout(timeo);
1708 }
aa395145 1709 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1710 return timeo;
1711}
1712
1713
1714/*
1715 * Generic send/receive buffer handlers
1716 */
1717
4cc7f68d
HX		 1718struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1719 unsigned long data_len, int noblock,
1720 int *errcode)
1da177e4
LT		 1721{
1722 struct sk_buff *skb;
7d877f3b 1723 gfp_t gfp_mask;
1da177e4
LT		 1724 long timeo;
1725 int err;
cc9b17ad
JW		 1726 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1727
1728 err = -EMSGSIZE;
1729 if (npages > MAX_SKB_FRAGS)
1730 goto failure;
1da177e4
LT		 1731
1732 gfp_mask = sk->sk_allocation;
1733 if (gfp_mask & __GFP_WAIT)
1734 gfp_mask |= __GFP_REPEAT;
1735
1736 timeo = sock_sndtimeo(sk, noblock);
1737 while (1) {
1738 err = sock_error(sk);
1739 if (err != 0)
1740 goto failure;
1741
1742 err = -EPIPE;
1743 if (sk->sk_shutdown & SEND_SHUTDOWN)
1744 goto failure;
1745
1746 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1747 skb = alloc_skb(header_len, gfp_mask);
1da177e4 1748 if (skb) {
1da177e4
LT		 1749 int i;
1750
1751 /* No pages, we're done... */
1752 if (!data_len)
1753 break;
1754
1da177e4
LT		 1755 skb->truesize += data_len;
1756 skb_shinfo(skb)->nr_frags = npages;
1757 for (i = 0; i < npages; i++) {
1758 struct page *page;
1da177e4
LT		 1759
1760 page = alloc_pages(sk->sk_allocation, 0);
1761 if (!page) {
1762 err = -ENOBUFS;
1763 skb_shinfo(skb)->nr_frags = i;
1764 kfree_skb(skb);
1765 goto failure;
1766 }
1767
ea2ab693
IC		 1768 __skb_fill_page_desc(skb, i,
1769 page, 0,
1770 (data_len >= PAGE_SIZE ?
1771 PAGE_SIZE :
1772 data_len));
1da177e4
LT		 1773 data_len -= PAGE_SIZE;
1774 }
1775
1776 /* Full success... */
1777 break;
1778 }
1779 err = -ENOBUFS;
1780 goto failure;
1781 }
1782 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1783 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1784 err = -EAGAIN;
1785 if (!timeo)
1786 goto failure;
1787 if (signal_pending(current))
1788 goto interrupted;
1789 timeo = sock_wait_for_wmem(sk, timeo);
1790 }
1791
1792 skb_set_owner_w(skb, sk);
1793 return skb;
1794
1795interrupted:
1796 err = sock_intr_errno(timeo);
1797failure:
1798 *errcode = err;
1799 return NULL;
1800}
4cc7f68d 1801EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1802
4ec93edb 1803struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1804 int noblock, int *errcode)
1805{
1806 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1807}
2a91525c 1808EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1809
5640f768
ED		 1810/* On 32bit arches, an skb frag is limited to 2^15 */
1811#define SKB_FRAG_PAGE_ORDER get_order(32768)
1812
1813bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1814{
1815 int order;
1816
1817 if (pfrag->page) {
1818 if (atomic_read(&pfrag->page->_count) == 1) {
1819 pfrag->offset = 0;
1820 return true;
1821 }
1822 if (pfrag->offset < pfrag->size)
1823 return true;
1824 put_page(pfrag->page);
1825 }
1826
1827 /* We restrict high order allocations to users that can afford to wait */
1828 order = (sk->sk_allocation & __GFP_WAIT) ? SKB_FRAG_PAGE_ORDER : 0;
1829
1830 do {
1831 gfp_t gfp = sk->sk_allocation;
1832
1833 if (order)
1834 gfp |= __GFP_COMP | __GFP_NOWARN;
1835 pfrag->page = alloc_pages(gfp, order);
1836 if (likely(pfrag->page)) {
1837 pfrag->offset = 0;
1838 pfrag->size = PAGE_SIZE << order;
1839 return true;
1840 }
1841 } while (--order >= 0);
1842
1843 sk_enter_memory_pressure(sk);
1844 sk_stream_moderate_sndbuf(sk);
1845 return false;
1846}
1847EXPORT_SYMBOL(sk_page_frag_refill);
1848
1da177e4 1849static void __lock_sock(struct sock *sk)
f39234d6
NK		 1850 __releases(&sk->sk_lock.slock)
1851 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1852{
1853 DEFINE_WAIT(wait);
1854
e71a4783 1855 for (;;) {
1da177e4
LT		 1856 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1857 TASK_UNINTERRUPTIBLE);
1858 spin_unlock_bh(&sk->sk_lock.slock);
1859 schedule();
1860 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1861 if (!sock_owned_by_user(sk))
1da177e4
LT		 1862 break;
1863 }
1864 finish_wait(&sk->sk_lock.wq, &wait);
1865}
1866
1867static void __release_sock(struct sock *sk)
f39234d6
NK		 1868 __releases(&sk->sk_lock.slock)
1869 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1870{
1871 struct sk_buff *skb = sk->sk_backlog.head;
1872
1873 do {
1874 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1875 bh_unlock_sock(sk);
1876
1877 do {
1878 struct sk_buff *next = skb->next;
1879
e4cbb02a 1880 prefetch(next);
7fee226a 1881 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1882 skb->next = NULL;
c57943a1 1883 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1884
1885 /*
1886 * We are in process context here with softirqs
1887 * disabled, use cond_resched_softirq() to preempt.
1888 * This is safe to do because we've taken the backlog
1889 * queue private:
1890 */
1891 cond_resched_softirq();
1892
1893 skb = next;
1894 } while (skb != NULL);
1895
1896 bh_lock_sock(sk);
e71a4783 1897 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1898
1899 /*
1900 * Doing the zeroing here guarantee we can not loop forever
1901 * while a wild producer attempts to flood us.
1902 */
1903 sk->sk_backlog.len = 0;
1da177e4
LT		 1904}
1905
1906/**
1907 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1908 * @sk: sock to wait on
1909 * @timeo: for how long
1da177e4
LT		 1910 *
1911 * Now socket state including sk->sk_err is changed only under lock,
1912 * hence we may omit checks after joining wait queue.
1913 * We check receive queue before schedule() only as optimization;
1914 * it is very likely that release_sock() added new data.
1915 */
1916int sk_wait_data(struct sock *sk, long *timeo)
1917{
1918 int rc;
1919 DEFINE_WAIT(wait);
1920
aa395145 1921 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1922 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1923 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1924 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1925 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1926 return rc;
1927}
1da177e4
LT		 1928EXPORT_SYMBOL(sk_wait_data);
1929
3ab224be
HA		 1930/**
1931 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1932 * @sk: socket
1933 * @size: memory size to allocate
1934 * @kind: allocation type
1935 *
1936 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1937 * rmem allocation. This function assumes that protocols which have
1938 * memory_pressure use sk_wmem_queued as write buffer accounting.
1939 */
1940int __sk_mem_schedule(struct sock *sk, int size, int kind)
1941{
1942 struct proto *prot = sk->sk_prot;
1943 int amt = sk_mem_pages(size);
8d987e5c 1944 long allocated;
e1aab161 1945 int parent_status = UNDER_LIMIT;
3ab224be
HA		 1946
1947 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 1948
e1aab161 1949 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 1950
1951 /* Under limit. */
e1aab161
GC		 1952 if (parent_status == UNDER_LIMIT &&
1953 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 1954 sk_leave_memory_pressure(sk);
3ab224be
HA		 1955 return 1;
1956 }
1957
e1aab161
GC		 1958 /* Under pressure. (we or our parents) */
1959 if ((parent_status > SOFT_LIMIT) ||
1960 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 1961 sk_enter_memory_pressure(sk);
3ab224be 1962
e1aab161
GC		 1963 /* Over hard limit (we or our parents) */
1964 if ((parent_status == OVER_LIMIT) ||
1965 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 1966 goto suppress_allocation;
1967
1968 /* guarantee minimum buffer size under pressure */
1969 if (kind == SK_MEM_RECV) {
1970 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1971 return 1;
180d8cd9 1972
3ab224be
HA		 1973 } else { /* SK_MEM_SEND */
1974 if (sk->sk_type == SOCK_STREAM) {
1975 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1976 return 1;
1977 } else if (atomic_read(&sk->sk_wmem_alloc) <
1978 prot->sysctl_wmem[0])
1979 return 1;
1980 }
1981
180d8cd9 1982 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 1983 int alloc;
1984
180d8cd9 1985 if (!sk_under_memory_pressure(sk))
1748376b 1986 return 1;
180d8cd9
GC		 1987 alloc = sk_sockets_allocated_read_positive(sk);
1988 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 1989 sk_mem_pages(sk->sk_wmem_queued +
1990 atomic_read(&sk->sk_rmem_alloc) +
1991 sk->sk_forward_alloc))
1992 return 1;
1993 }
1994
1995suppress_allocation:
1996
1997 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1998 sk_stream_moderate_sndbuf(sk);
1999
2000 /* Fail only if socket is _under_ its sndbuf.
2001 * In this case we cannot block, so that we have to fail.
2002 */
2003 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2004 return 1;
2005 }
2006
3847ce32
SM		 2007 trace_sock_exceed_buf_limit(sk, prot, allocated);
2008
3ab224be
HA		 2009 /* Alas. Undo changes. */
2010 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2011
0e90b31f 2012 sk_memory_allocated_sub(sk, amt);
180d8cd9 2013
3ab224be
HA		 2014 return 0;
2015}
3ab224be
HA		 2016EXPORT_SYMBOL(__sk_mem_schedule);
2017
2018/**
2019 * __sk_reclaim - reclaim memory_allocated
2020 * @sk: socket
2021 */
2022void __sk_mem_reclaim(struct sock *sk)
2023{
180d8cd9 2024 sk_memory_allocated_sub(sk,
0e90b31f 2025 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
3ab224be
HA		 2026 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
2027
180d8cd9
GC		 2028 if (sk_under_memory_pressure(sk) &&
2029 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2030 sk_leave_memory_pressure(sk);
3ab224be 2031}
3ab224be
HA		 2032EXPORT_SYMBOL(__sk_mem_reclaim);
2033
2034
1da177e4
LT		 2035/*
2036 * Set of default routines for initialising struct proto_ops when
2037 * the protocol does not support a particular function. In certain
2038 * cases where it makes no sense for a protocol to have a "do nothing"
2039 * function, some default processing is provided.
2040 */
2041
2042int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2043{
2044 return -EOPNOTSUPP;
2045}
2a91525c 2046EXPORT_SYMBOL(sock_no_bind);
1da177e4 2047
4ec93edb 2048int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2049 int len, int flags)
2050{
2051 return -EOPNOTSUPP;
2052}
2a91525c 2053EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2054
2055int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2056{
2057 return -EOPNOTSUPP;
2058}
2a91525c 2059EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2060
2061int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2062{
2063 return -EOPNOTSUPP;
2064}
2a91525c 2065EXPORT_SYMBOL(sock_no_accept);
1da177e4 2066
4ec93edb 2067int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2068 int *len, int peer)
2069{
2070 return -EOPNOTSUPP;
2071}
2a91525c 2072EXPORT_SYMBOL(sock_no_getname);
1da177e4 2073
2a91525c 2074unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2075{
2076 return 0;
2077}
2a91525c 2078EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2079
2080int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2081{
2082 return -EOPNOTSUPP;
2083}
2a91525c 2084EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2085
2086int sock_no_listen(struct socket *sock, int backlog)
2087{
2088 return -EOPNOTSUPP;
2089}
2a91525c 2090EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2091
2092int sock_no_shutdown(struct socket *sock, int how)
2093{
2094 return -EOPNOTSUPP;
2095}
2a91525c 2096EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2097
2098int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2099 char __user *optval, unsigned int optlen)
1da177e4
LT		 2100{
2101 return -EOPNOTSUPP;
2102}
2a91525c 2103EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2104
2105int sock_no_getsockopt(struct socket *sock, int level, int optname,
2106 char __user *optval, int __user *optlen)
2107{
2108 return -EOPNOTSUPP;
2109}
2a91525c 2110EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 2111
2112int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2113 size_t len)
2114{
2115 return -EOPNOTSUPP;
2116}
2a91525c 2117EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 2118
2119int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2120 size_t len, int flags)
2121{
2122 return -EOPNOTSUPP;
2123}
2a91525c 2124EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2125
2126int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2127{
2128 /* Mirror missing mmap method error code */
2129 return -ENODEV;
2130}
2a91525c 2131EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2132
2133ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2134{
2135 ssize_t res;
2136 struct msghdr msg = {.msg_flags = flags};
2137 struct kvec iov;
2138 char *kaddr = kmap(page);
2139 iov.iov_base = kaddr + offset;
2140 iov.iov_len = size;
2141 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2142 kunmap(page);
2143 return res;
2144}
2a91525c 2145EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2146
2147/*
2148 * Default Socket Callbacks
2149 */
2150
2151static void sock_def_wakeup(struct sock *sk)
2152{
43815482
ED		 2153 struct socket_wq *wq;
2154
2155 rcu_read_lock();
2156 wq = rcu_dereference(sk->sk_wq);
2157 if (wq_has_sleeper(wq))
2158 wake_up_interruptible_all(&wq->wait);
2159 rcu_read_unlock();
1da177e4
LT		 2160}
2161
2162static void sock_def_error_report(struct sock *sk)
2163{
43815482
ED		 2164 struct socket_wq *wq;
2165
2166 rcu_read_lock();
2167 wq = rcu_dereference(sk->sk_wq);
2168 if (wq_has_sleeper(wq))
2169 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2170 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2171 rcu_read_unlock();
1da177e4
LT		 2172}
2173
2174static void sock_def_readable(struct sock *sk, int len)
2175{
43815482
ED		 2176 struct socket_wq *wq;
2177
2178 rcu_read_lock();
2179 wq = rcu_dereference(sk->sk_wq);
2180 if (wq_has_sleeper(wq))
2c6607c6 2181 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2182 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2183 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2184 rcu_read_unlock();
1da177e4
LT		 2185}
2186
2187static void sock_def_write_space(struct sock *sk)
2188{
43815482
ED		 2189 struct socket_wq *wq;
2190
2191 rcu_read_lock();
1da177e4
LT		 2192
2193 /* Do not wake up a writer until he can make "significant"
2194 * progress. --DaveM
2195 */
e71a4783 2196 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2197 wq = rcu_dereference(sk->sk_wq);
2198 if (wq_has_sleeper(wq))
2199 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2200 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2201
2202 /* Should agree with poll, otherwise some programs break */
2203 if (sock_writeable(sk))
8d8ad9d7 2204 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2205 }
2206
43815482 2207 rcu_read_unlock();
1da177e4
LT		 2208}
2209
2210static void sock_def_destruct(struct sock *sk)
2211{
a51482bd 2212 kfree(sk->sk_protinfo);
1da177e4
LT		 2213}
2214
2215void sk_send_sigurg(struct sock *sk)
2216{
2217 if (sk->sk_socket && sk->sk_socket->file)
2218 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2219 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2220}
2a91525c 2221EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2222
2223void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2224 unsigned long expires)
2225{
2226 if (!mod_timer(timer, expires))
2227 sock_hold(sk);
2228}
1da177e4
LT		 2229EXPORT_SYMBOL(sk_reset_timer);
2230
2231void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2232{
25cc4ae9 2233 if (del_timer(timer))
1da177e4
LT		 2234 __sock_put(sk);
2235}
1da177e4
LT		 2236EXPORT_SYMBOL(sk_stop_timer);
2237
2238void sock_init_data(struct socket *sock, struct sock *sk)
2239{
2240 skb_queue_head_init(&sk->sk_receive_queue);
2241 skb_queue_head_init(&sk->sk_write_queue);
2242 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 2243#ifdef CONFIG_NET_DMA
2244 skb_queue_head_init(&sk->sk_async_wait_queue);
2245#endif
1da177e4
LT		 2246
2247 sk->sk_send_head = NULL;
2248
2249 init_timer(&sk->sk_timer);
4ec93edb 2250
1da177e4
LT		 2251 sk->sk_allocation = GFP_KERNEL;
2252 sk->sk_rcvbuf = sysctl_rmem_default;
2253 sk->sk_sndbuf = sysctl_wmem_default;
2254 sk->sk_state = TCP_CLOSE;
972692e0 2255 sk_set_socket(sk, sock);
1da177e4
LT		 2256
2257 sock_set_flag(sk, SOCK_ZAPPED);
2258
e71a4783 2259 if (sock) {
1da177e4 2260 sk->sk_type = sock->type;
43815482 2261 sk->sk_wq = sock->wq;
1da177e4
LT		 2262 sock->sk = sk;
2263 } else
43815482 2264 sk->sk_wq = NULL;
1da177e4 2265
b6c6712a 2266 spin_lock_init(&sk->sk_dst_lock);
1da177e4 2267 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2268 lockdep_set_class_and_name(&sk->sk_callback_lock,
2269 af_callback_keys + sk->sk_family,
2270 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2271
2272 sk->sk_state_change = sock_def_wakeup;
2273 sk->sk_data_ready = sock_def_readable;
2274 sk->sk_write_space = sock_def_write_space;
2275 sk->sk_error_report = sock_def_error_report;
2276 sk->sk_destruct = sock_def_destruct;
2277
5640f768
ED		 2278 sk->sk_frag.page = NULL;
2279 sk->sk_frag.offset = 0;
ef64a54f 2280 sk->sk_peek_off = -1;
1da177e4 2281
109f6e39
EB		 2282 sk->sk_peer_pid = NULL;
2283 sk->sk_peer_cred = NULL;
1da177e4
LT		 2284 sk->sk_write_pending = 0;
2285 sk->sk_rcvlowat = 1;
2286 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2287 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2288
f37f0afb 2289 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2290
4dc6dc71
ED		 2291 /*
2292 * Before updating sk_refcnt, we must commit prior changes to memory
2293 * (Documentation/RCU/rculist_nulls.txt for details)
2294 */
2295 smp_wmb();
1da177e4 2296 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2297 atomic_set(&sk->sk_drops, 0);
1da177e4 2298}
2a91525c 2299EXPORT_SYMBOL(sock_init_data);
1da177e4 2300
b5606c2d 2301void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2302{
2303 might_sleep();
a5b5bb9a 2304 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2305 if (sk->sk_lock.owned)
1da177e4 2306 __lock_sock(sk);
d2e9117c 2307 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2308 spin_unlock(&sk->sk_lock.slock);
2309 /*
2310 * The sk_lock has mutex_lock() semantics here:
2311 */
fcc70d5f 2312 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2313 local_bh_enable();
1da177e4 2314}
fcc70d5f 2315EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2316
b5606c2d 2317void release_sock(struct sock *sk)
1da177e4 2318{
a5b5bb9a
IM		 2319 /*
2320 * The sk_lock has mutex_unlock() semantics:
2321 */
2322 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2323
2324 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2325 if (sk->sk_backlog.tail)
2326 __release_sock(sk);
46d3ceab
ED		 2327
2328 if (sk->sk_prot->release_cb)
2329 sk->sk_prot->release_cb(sk);
2330
d2e9117c 2331 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 2332 if (waitqueue_active(&sk->sk_lock.wq))
2333 wake_up(&sk->sk_lock.wq);
2334 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2335}
2336EXPORT_SYMBOL(release_sock);
2337
8a74ad60
ED		 2338/**
2339 * lock_sock_fast - fast version of lock_sock
2340 * @sk: socket
2341 *
2342 * This version should be used for very small section, where process wont block
2343 * return false if fast path is taken
2344 * sk_lock.slock locked, owned = 0, BH disabled
2345 * return true if slow path is taken
2346 * sk_lock.slock unlocked, owned = 1, BH enabled
2347 */
2348bool lock_sock_fast(struct sock *sk)
2349{
2350 might_sleep();
2351 spin_lock_bh(&sk->sk_lock.slock);
2352
2353 if (!sk->sk_lock.owned)
2354 /*
2355 * Note : We must disable BH
2356 */
2357 return false;
2358
2359 __lock_sock(sk);
2360 sk->sk_lock.owned = 1;
2361 spin_unlock(&sk->sk_lock.slock);
2362 /*
2363 * The sk_lock has mutex_lock() semantics here:
2364 */
2365 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2366 local_bh_enable();
2367 return true;
2368}
2369EXPORT_SYMBOL(lock_sock_fast);
2370
1da177e4 2371int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2372{
b7aa0bf7 2373 struct timeval tv;
1da177e4 2374 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2375 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2376 tv = ktime_to_timeval(sk->sk_stamp);
2377 if (tv.tv_sec == -1)
1da177e4 2378 return -ENOENT;
b7aa0bf7
ED		 2379 if (tv.tv_sec == 0) {
2380 sk->sk_stamp = ktime_get_real();
2381 tv = ktime_to_timeval(sk->sk_stamp);
2382 }
2383 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2384}
1da177e4
LT		 2385EXPORT_SYMBOL(sock_get_timestamp);
2386
ae40eb1e
ED		 2387int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2388{
2389 struct timespec ts;
2390 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2391 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2392 ts = ktime_to_timespec(sk->sk_stamp);
2393 if (ts.tv_sec == -1)
2394 return -ENOENT;
2395 if (ts.tv_sec == 0) {
2396 sk->sk_stamp = ktime_get_real();
2397 ts = ktime_to_timespec(sk->sk_stamp);
2398 }
2399 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2400}
2401EXPORT_SYMBOL(sock_get_timestampns);
2402
20d49473 2403void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2404{
20d49473 2405 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2406 unsigned long previous_flags = sk->sk_flags;
2407
20d49473
PO		 2408 sock_set_flag(sk, flag);
2409 /*
2410 * we just set one of the two flags which require net
2411 * time stamping, but time stamping might have been on
2412 * already because of the other one
2413 */
08e29af3 2414 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2415 net_enable_timestamp();
1da177e4
LT		 2416 }
2417}
1da177e4
LT		 2418
2419/*
2420 * Get a socket option on an socket.
2421 *
2422 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2423 * asynchronous errors should be reported by getsockopt. We assume
2424 * this means if you specify SO_ERROR (otherwise whats the point of it).
2425 */
2426int sock_common_getsockopt(struct socket *sock, int level, int optname,
2427 char __user *optval, int __user *optlen)
2428{
2429 struct sock *sk = sock->sk;
2430
2431 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2432}
1da177e4
LT		 2433EXPORT_SYMBOL(sock_common_getsockopt);
2434
3fdadf7d 2435#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2436int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2437 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2438{
2439 struct sock *sk = sock->sk;
2440
1e51f951 2441 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2442 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2443 optval, optlen);
3fdadf7d
DM		 2444 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2445}
2446EXPORT_SYMBOL(compat_sock_common_getsockopt);
2447#endif
2448
1da177e4
LT		 2449int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2450 struct msghdr *msg, size_t size, int flags)
2451{
2452 struct sock *sk = sock->sk;
2453 int addr_len = 0;
2454 int err;
2455
2456 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2457 flags & ~MSG_DONTWAIT, &addr_len);
2458 if (err >= 0)
2459 msg->msg_namelen = addr_len;
2460 return err;
2461}
1da177e4
LT		 2462EXPORT_SYMBOL(sock_common_recvmsg);
2463
2464/*
2465 * Set socket options on an inet socket.
2466 */
2467int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2468 char __user *optval, unsigned int optlen)
1da177e4
LT		 2469{
2470 struct sock *sk = sock->sk;
2471
2472 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2473}
1da177e4
LT		 2474EXPORT_SYMBOL(sock_common_setsockopt);
2475
3fdadf7d 2476#ifdef CONFIG_COMPAT
543d9cfe 2477int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2478 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2479{
2480 struct sock *sk = sock->sk;
2481
543d9cfe
ACM		 2482 if (sk->sk_prot->compat_setsockopt != NULL)
2483 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2484 optval, optlen);
3fdadf7d
DM		 2485 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2486}
2487EXPORT_SYMBOL(compat_sock_common_setsockopt);
2488#endif
2489
1da177e4
LT		 2490void sk_common_release(struct sock *sk)
2491{
2492 if (sk->sk_prot->destroy)
2493 sk->sk_prot->destroy(sk);
2494
2495 /*
2496 * Observation: when sock_common_release is called, processes have
2497 * no access to socket. But net still has.
2498 * Step one, detach it from networking:
2499 *
2500 * A. Remove from hash tables.
2501 */
2502
2503 sk->sk_prot->unhash(sk);
2504
2505 /*
2506 * In this point socket cannot receive new packets, but it is possible
2507 * that some packets are in flight because some CPU runs receiver and
2508 * did hash table lookup before we unhashed socket. They will achieve
2509 * receive queue and will be purged by socket destructor.
2510 *
2511 * Also we still have packets pending on receive queue and probably,
2512 * our own packets waiting in device queues. sock_destroy will drain
2513 * receive queue, but transmitted packets will delay socket destruction
2514 * until the last reference will be released.
2515 */
2516
2517 sock_orphan(sk);
2518
2519 xfrm_sk_free_policy(sk);
2520
e6848976 2521 sk_refcnt_debug_release(sk);
5640f768
ED		 2522
2523 if (sk->sk_frag.page) {
2524 put_page(sk->sk_frag.page);
2525 sk->sk_frag.page = NULL;
2526 }
2527
1da177e4
LT		 2528 sock_put(sk);
2529}
1da177e4
LT		 2530EXPORT_SYMBOL(sk_common_release);
2531
13ff3d6f
PE		 2532#ifdef CONFIG_PROC_FS
2533#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2534struct prot_inuse {
2535 int val[PROTO_INUSE_NR];
2536};
13ff3d6f
PE		 2537
2538static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2539
2540#ifdef CONFIG_NET_NS
2541void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2542{
d6d9ca0f 2543 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2544}
2545EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2546
2547int sock_prot_inuse_get(struct net *net, struct proto *prot)
2548{
2549 int cpu, idx = prot->inuse_idx;
2550 int res = 0;
2551
2552 for_each_possible_cpu(cpu)
2553 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2554
2555 return res >= 0 ? res : 0;
2556}
2557EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2558
2c8c1e72 2559static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2560{
2561 net->core.inuse = alloc_percpu(struct prot_inuse);
2562 return net->core.inuse ? 0 : -ENOMEM;
2563}
2564
2c8c1e72 2565static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2566{
2567 free_percpu(net->core.inuse);
2568}
2569
2570static struct pernet_operations net_inuse_ops = {
2571 .init = sock_inuse_init_net,
2572 .exit = sock_inuse_exit_net,
2573};
2574
2575static __init int net_inuse_init(void)
2576{
2577 if (register_pernet_subsys(&net_inuse_ops))
2578 panic("Cannot initialize net inuse counters");
2579
2580 return 0;
2581}
2582
2583core_initcall(net_inuse_init);
2584#else
1338d466
PE		 2585static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2586
c29a0bc4 2587void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2588{
d6d9ca0f 2589 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2590}
2591EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2592
c29a0bc4 2593int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2594{
2595 int cpu, idx = prot->inuse_idx;
2596 int res = 0;
2597
2598 for_each_possible_cpu(cpu)
2599 res += per_cpu(prot_inuse, cpu).val[idx];
2600
2601 return res >= 0 ? res : 0;
2602}
2603EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2604#endif
13ff3d6f
PE		 2605
2606static void assign_proto_idx(struct proto *prot)
2607{
2608 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2609
2610 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2611 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2612 return;
2613 }
2614
2615 set_bit(prot->inuse_idx, proto_inuse_idx);
2616}
2617
2618static void release_proto_idx(struct proto *prot)
2619{
2620 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2621 clear_bit(prot->inuse_idx, proto_inuse_idx);
2622}
2623#else
2624static inline void assign_proto_idx(struct proto *prot)
2625{
2626}
2627
2628static inline void release_proto_idx(struct proto *prot)
2629{
2630}
2631#endif
2632
b733c007
PE		 2633int proto_register(struct proto *prot, int alloc_slab)
2634{
1da177e4
LT		 2635 if (alloc_slab) {
2636 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2637 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2638 NULL);
1da177e4
LT		 2639
2640 if (prot->slab == NULL) {
e005d193
JP		 2641 pr_crit("%s: Can't create sock SLAB cache!\n",
2642 prot->name);
60e7663d 2643 goto out;
1da177e4 2644 }
2e6599cb
ACM		 2645
2646 if (prot->rsk_prot != NULL) {
faf23422 2647 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2648 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2649 goto out_free_sock_slab;
2650
7e56b5d6 2651 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2652 prot->rsk_prot->obj_size, 0,
20c2df83 2653 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2654
2655 if (prot->rsk_prot->slab == NULL) {
e005d193
JP		 2656 pr_crit("%s: Can't create request sock SLAB cache!\n",
2657 prot->name);
2e6599cb
ACM		 2658 goto out_free_request_sock_slab_name;
2659 }
2660 }
8feaf0c0 2661
6d6ee43e 2662 if (prot->twsk_prot != NULL) {
faf23422 2663 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2664
7e56b5d6 2665 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2666 goto out_free_request_sock_slab;
2667
6d6ee43e 2668 prot->twsk_prot->twsk_slab =
7e56b5d6 2669 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2670 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2671 0,
2672 SLAB_HWCACHE_ALIGN |
2673 prot->slab_flags,
20c2df83 2674 NULL);
6d6ee43e 2675 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2676 goto out_free_timewait_sock_slab_name;
2677 }
1da177e4
LT		 2678 }
2679
36b77a52 2680 mutex_lock(&proto_list_mutex);
1da177e4 2681 list_add(&prot->node, &proto_list);
13ff3d6f 2682 assign_proto_idx(prot);
36b77a52 2683 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2684 return 0;
2685
8feaf0c0 2686out_free_timewait_sock_slab_name:
7e56b5d6 2687 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2688out_free_request_sock_slab:
2689 if (prot->rsk_prot && prot->rsk_prot->slab) {
2690 kmem_cache_destroy(prot->rsk_prot->slab);
2691 prot->rsk_prot->slab = NULL;
2692 }
2e6599cb 2693out_free_request_sock_slab_name:
72150e9b
DC		 2694 if (prot->rsk_prot)
2695 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2696out_free_sock_slab:
2697 kmem_cache_destroy(prot->slab);
2698 prot->slab = NULL;
b733c007
PE		 2699out:
2700 return -ENOBUFS;
1da177e4 2701}
1da177e4
LT		 2702EXPORT_SYMBOL(proto_register);
2703
2704void proto_unregister(struct proto *prot)
2705{
36b77a52 2706 mutex_lock(&proto_list_mutex);
13ff3d6f 2707 release_proto_idx(prot);
0a3f4358 2708 list_del(&prot->node);
36b77a52 2709 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2710
2711 if (prot->slab != NULL) {
2712 kmem_cache_destroy(prot->slab);
2713 prot->slab = NULL;
2714 }
2715
2e6599cb 2716 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2717 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2718 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2719 prot->rsk_prot->slab = NULL;
2720 }
2721
6d6ee43e 2722 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2723 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2724 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2725 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2726 }
1da177e4 2727}
1da177e4
LT		 2728EXPORT_SYMBOL(proto_unregister);
2729
2730#ifdef CONFIG_PROC_FS
1da177e4 2731static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2732 __acquires(proto_list_mutex)
1da177e4 2733{
36b77a52 2734 mutex_lock(&proto_list_mutex);
60f0438a 2735 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2736}
2737
2738static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2739{
60f0438a 2740 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2741}
2742
2743static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2744 __releases(proto_list_mutex)
1da177e4 2745{
36b77a52 2746 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2747}
2748
2749static char proto_method_implemented(const void *method)
2750{
2751 return method == NULL ? 'n' : 'y';
2752}
180d8cd9
GC		 2753static long sock_prot_memory_allocated(struct proto *proto)
2754{
cb75a36c 2755 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2756}
2757
2758static char *sock_prot_memory_pressure(struct proto *proto)
2759{
2760 return proto->memory_pressure != NULL ?
2761 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2762}
1da177e4
LT		 2763
2764static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2765{
180d8cd9 2766
8d987e5c 2767 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2768 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2769 proto->name,
2770 proto->obj_size,
14e943db 2771 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2772 sock_prot_memory_allocated(proto),
2773 sock_prot_memory_pressure(proto),
1da177e4
LT		 2774 proto->max_header,
2775 proto->slab == NULL ? "no" : "yes",
2776 module_name(proto->owner),
2777 proto_method_implemented(proto->close),
2778 proto_method_implemented(proto->connect),
2779 proto_method_implemented(proto->disconnect),
2780 proto_method_implemented(proto->accept),
2781 proto_method_implemented(proto->ioctl),
2782 proto_method_implemented(proto->init),
2783 proto_method_implemented(proto->destroy),
2784 proto_method_implemented(proto->shutdown),
2785 proto_method_implemented(proto->setsockopt),
2786 proto_method_implemented(proto->getsockopt),
2787 proto_method_implemented(proto->sendmsg),
2788 proto_method_implemented(proto->recvmsg),
2789 proto_method_implemented(proto->sendpage),
2790 proto_method_implemented(proto->bind),
2791 proto_method_implemented(proto->backlog_rcv),
2792 proto_method_implemented(proto->hash),
2793 proto_method_implemented(proto->unhash),
2794 proto_method_implemented(proto->get_port),
2795 proto_method_implemented(proto->enter_memory_pressure));
2796}
2797
2798static int proto_seq_show(struct seq_file *seq, void *v)
2799{
60f0438a 2800 if (v == &proto_list)
1da177e4
LT		 2801 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2802 "protocol",
2803 "size",
2804 "sockets",
2805 "memory",
2806 "press",
2807 "maxhdr",
2808 "slab",
2809 "module",
2810 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2811 else
60f0438a 2812 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2813 return 0;
2814}
2815
f690808e 2816static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2817 .start = proto_seq_start,
2818 .next = proto_seq_next,
2819 .stop = proto_seq_stop,
2820 .show = proto_seq_show,
2821};
2822
2823static int proto_seq_open(struct inode *inode, struct file *file)
2824{
14e943db
ED		 2825 return seq_open_net(inode, file, &proto_seq_ops,
2826 sizeof(struct seq_net_private));
1da177e4
LT		 2827}
2828
9a32144e 2829static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2830 .owner = THIS_MODULE,
2831 .open = proto_seq_open,
2832 .read = seq_read,
2833 .llseek = seq_lseek,
14e943db
ED		 2834 .release = seq_release_net,
2835};
2836
2837static __net_init int proto_init_net(struct net *net)
2838{
d4beaa66 2839 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 2840 return -ENOMEM;
2841
2842 return 0;
2843}
2844
2845static __net_exit void proto_exit_net(struct net *net)
2846{
2847 proc_net_remove(net, "protocols");
2848}
2849
2850
2851static __net_initdata struct pernet_operations proto_net_ops = {
2852 .init = proto_init_net,
2853 .exit = proto_exit_net,
1da177e4
LT		 2854};
2855
2856static int __init proto_init(void)
2857{
14e943db 2858 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2859}
2860
2861subsys_initcall(proto_init);
2862
2863#endif /* PROC_FS */
Linux 6.x block layer and io_uring tree(s)