projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
net: remove NET_LL_RX_POLL config menue
[deliverable/linux.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
06021292
ET		 142#include <net/ll_poll.h>
143
36b77a52 144static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 145static LIST_HEAD(proto_list);
146
c255a458 147#ifdef CONFIG_MEMCG_KMEM
1d62e436 148int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
d1a4c0b3
GC		 149{
150 struct proto *proto;
151 int ret = 0;
152
36b77a52 153 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 154 list_for_each_entry(proto, &proto_list, node) {
155 if (proto->init_cgroup) {
1d62e436 156 ret = proto->init_cgroup(memcg, ss);
d1a4c0b3
GC		 157 if (ret)
158 goto out;
159 }
160 }
161
36b77a52 162 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 163 return ret;
164out:
165 list_for_each_entry_continue_reverse(proto, &proto_list, node)
166 if (proto->destroy_cgroup)
1d62e436 167 proto->destroy_cgroup(memcg);
36b77a52 168 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 169 return ret;
170}
171
1d62e436 172void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
d1a4c0b3
GC		 173{
174 struct proto *proto;
175
36b77a52 176 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 177 list_for_each_entry_reverse(proto, &proto_list, node)
178 if (proto->destroy_cgroup)
1d62e436 179 proto->destroy_cgroup(memcg);
36b77a52 180 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 181}
182#endif
183
da21f24d
IM		 184/*
185 * Each address family might have different locking rules, so we have
186 * one slock key per address family:
187 */
a5b5bb9a
IM		 188static struct lock_class_key af_family_keys[AF_MAX];
189static struct lock_class_key af_family_slock_keys[AF_MAX];
190
cbda4eaf 191#if defined(CONFIG_MEMCG_KMEM)
c5905afb 192struct static_key memcg_socket_limit_enabled;
e1aab161 193EXPORT_SYMBOL(memcg_socket_limit_enabled);
cbda4eaf 194#endif
e1aab161 195
a5b5bb9a
IM		 196/*
197 * Make lock validator output more readable. (we pre-construct these
198 * strings build-time, so that runtime initialization of socket
199 * locks is fast):
200 */
36cbd3dc 201static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 202 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
203 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
204 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
205 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
206 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
207 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
208 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 209 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 210 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 211 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 212 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 213 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 214 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
456db6a4 215 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX"
a5b5bb9a 216};
36cbd3dc 217static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 218 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
219 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
220 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
221 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
222 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
223 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
224 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 225 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 226 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 227 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 228 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 229 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 230 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
456db6a4 231 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX"
a5b5bb9a 232};
36cbd3dc 233static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 234 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
235 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
236 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
237 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
238 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
239 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
240 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 241 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 242 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 243 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 244 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 245 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 246 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
456db6a4 247 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX"
443aef0e 248};
da21f24d
IM		 249
250/*
251 * sk_callback_lock locking rules are per-address-family,
252 * so split the lock classes by using a per-AF key:
253 */
254static struct lock_class_key af_callback_keys[AF_MAX];
255
1da177e4
LT		 256/* Take into consideration the size of the struct sk_buff overhead in the
257 * determination of these values, since that is non-constant across
258 * platforms. This makes socket queueing behavior and performance
259 * not depend upon such differences.
260 */
261#define _SK_MEM_PACKETS 256
87fb4b7b 262#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 263#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
264#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
265
266/* Run time adjustable parameters. */
ab32ea5d 267__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 268EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 269__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 270EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 271__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
272__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 273
25985edc 274/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 275int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 276EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 277
c93bdd0e
MG		 278struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
279EXPORT_SYMBOL_GPL(memalloc_socks);
280
7cb02404
MG		 281/**
282 * sk_set_memalloc - sets %SOCK_MEMALLOC
283 * @sk: socket to set it on
284 *
285 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
286 * It's the responsibility of the admin to adjust min_free_kbytes
287 * to meet the requirements
288 */
289void sk_set_memalloc(struct sock *sk)
290{
291 sock_set_flag(sk, SOCK_MEMALLOC);
292 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 293 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 294}
295EXPORT_SYMBOL_GPL(sk_set_memalloc);
296
297void sk_clear_memalloc(struct sock *sk)
298{
299 sock_reset_flag(sk, SOCK_MEMALLOC);
300 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 301 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 302
303 /*
304 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
305 * progress of swapping. However, if SOCK_MEMALLOC is cleared while
306 * it has rmem allocations there is a risk that the user of the
307 * socket cannot make forward progress due to exceeding the rmem
308 * limits. By rights, sk_clear_memalloc() should only be called
309 * on sockets being torn down but warn and reset the accounting if
310 * that assumption breaks.
311 */
312 if (WARN_ON(sk->sk_forward_alloc))
313 sk_mem_reclaim(sk);
7cb02404
MG		 314}
315EXPORT_SYMBOL_GPL(sk_clear_memalloc);
316
b4b9e355
MG		 317int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
318{
319 int ret;
320 unsigned long pflags = current->flags;
321
322 /* these should have been dropped before queueing */
323 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
324
325 current->flags |= PF_MEMALLOC;
326 ret = sk->sk_backlog_rcv(sk, skb);
327 tsk_restore_flags(current, pflags, PF_MEMALLOC);
328
329 return ret;
330}
331EXPORT_SYMBOL(__sk_backlog_rcv);
332
1da177e4
LT		 333static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
334{
335 struct timeval tv;
336
337 if (optlen < sizeof(tv))
338 return -EINVAL;
339 if (copy_from_user(&tv, optval, sizeof(tv)))
340 return -EFAULT;
ba78073e
VA		 341 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
342 return -EDOM;
1da177e4 343
ba78073e 344 if (tv.tv_sec < 0) {
6f11df83
AM		 345 static int warned __read_mostly;
346
ba78073e 347 *timeo_p = 0;
50aab54f 348 if (warned < 10 && net_ratelimit()) {
ba78073e 349 warned++;
e005d193
JP		 350 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
351 __func__, current->comm, task_pid_nr(current));
50aab54f 352 }
ba78073e
VA		 353 return 0;
354 }
1da177e4
LT		 355 *timeo_p = MAX_SCHEDULE_TIMEOUT;
356 if (tv.tv_sec == 0 && tv.tv_usec == 0)
357 return 0;
358 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
359 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
360 return 0;
361}
362
363static void sock_warn_obsolete_bsdism(const char *name)
364{
365 static int warned;
366 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 367 if (strcmp(warncomm, current->comm) && warned < 5) {
368 strcpy(warncomm, current->comm);
e005d193
JP		 369 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
370 warncomm, name);
1da177e4
LT		 371 warned++;
372 }
373}
374
08e29af3
ED		 375#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
376
377static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 378{
08e29af3
ED		 379 if (sk->sk_flags & flags) {
380 sk->sk_flags &= ~flags;
381 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 382 net_disable_timestamp();
1da177e4
LT		 383 }
384}
385
386
f0088a50
DV		 387int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
388{
766e9037 389 int err;
f0088a50 390 int skb_len;
3b885787
NH		 391 unsigned long flags;
392 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 393
0fd7bac6 394 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 395 atomic_inc(&sk->sk_drops);
3847ce32 396 trace_sock_rcvqueue_full(sk, skb);
766e9037 397 return -ENOMEM;
f0088a50
DV		 398 }
399
fda9ef5d 400 err = sk_filter(sk, skb);
f0088a50 401 if (err)
766e9037 402 return err;
f0088a50 403
c76562b6 404 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 405 atomic_inc(&sk->sk_drops);
406 return -ENOBUFS;
3ab224be
HA		 407 }
408
f0088a50
DV		 409 skb->dev = NULL;
410 skb_set_owner_r(skb, sk);
49ad9599 411
f0088a50
DV		 412 /* Cache the SKB length before we tack it onto the receive
413 * queue. Once it is added it no longer belongs to us and
414 * may be freed by other threads of control pulling packets
415 * from the queue.
416 */
417 skb_len = skb->len;
418
7fee226a
ED		 419 /* we escape from rcu protected region, make sure we dont leak
420 * a norefcounted dst
421 */
422 skb_dst_force(skb);
423
3b885787
NH		 424 spin_lock_irqsave(&list->lock, flags);
425 skb->dropcount = atomic_read(&sk->sk_drops);
426 __skb_queue_tail(list, skb);
427 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 428
429 if (!sock_flag(sk, SOCK_DEAD))
430 sk->sk_data_ready(sk, skb_len);
766e9037 431 return 0;
f0088a50
DV		 432}
433EXPORT_SYMBOL(sock_queue_rcv_skb);
434
58a5a7b9 435int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 436{
437 int rc = NET_RX_SUCCESS;
438
fda9ef5d 439 if (sk_filter(sk, skb))
f0088a50
DV		 440 goto discard_and_relse;
441
442 skb->dev = NULL;
443
f545a38f 444 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) {
c377411f
ED		 445 atomic_inc(&sk->sk_drops);
446 goto discard_and_relse;
447 }
58a5a7b9
ACM		 448 if (nested)
449 bh_lock_sock_nested(sk);
450 else
451 bh_lock_sock(sk);
a5b5bb9a
IM		 452 if (!sock_owned_by_user(sk)) {
453 /*
454 * trylock + unlock semantics:
455 */
456 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
457
c57943a1 458 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 459
460 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 461 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 462 bh_unlock_sock(sk);
463 atomic_inc(&sk->sk_drops);
464 goto discard_and_relse;
465 }
466
f0088a50
DV		 467 bh_unlock_sock(sk);
468out:
469 sock_put(sk);
470 return rc;
471discard_and_relse:
472 kfree_skb(skb);
473 goto out;
474}
475EXPORT_SYMBOL(sk_receive_skb);
476
ea94ff3b
KK		 477void sk_reset_txq(struct sock *sk)
478{
479 sk_tx_queue_clear(sk);
480}
481EXPORT_SYMBOL(sk_reset_txq);
482
f0088a50
DV		 483struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
484{
b6c6712a 485 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 486
487 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 488 sk_tx_queue_clear(sk);
a9b3cd7f 489 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 490 dst_release(dst);
491 return NULL;
492 }
493
494 return dst;
495}
496EXPORT_SYMBOL(__sk_dst_check);
497
498struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
499{
500 struct dst_entry *dst = sk_dst_get(sk);
501
502 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
503 sk_dst_reset(sk);
504 dst_release(dst);
505 return NULL;
506 }
507
508 return dst;
509}
510EXPORT_SYMBOL(sk_dst_check);
511
c91f6df2
BH		 512static int sock_setbindtodevice(struct sock *sk, char __user *optval,
513 int optlen)
4878809f
DM		 514{
515 int ret = -ENOPROTOOPT;
516#ifdef CONFIG_NETDEVICES
3b1e0a65 517 struct net *net = sock_net(sk);
4878809f
DM		 518 char devname[IFNAMSIZ];
519 int index;
520
521 /* Sorry... */
522 ret = -EPERM;
5e1fccc0 523 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 524 goto out;
525
526 ret = -EINVAL;
527 if (optlen < 0)
528 goto out;
529
530 /* Bind this socket to a particular device like "eth0",
531 * as specified in the passed interface name. If the
532 * name is "" or the option length is zero the socket
533 * is not bound.
534 */
535 if (optlen > IFNAMSIZ - 1)
536 optlen = IFNAMSIZ - 1;
537 memset(devname, 0, sizeof(devname));
538
539 ret = -EFAULT;
540 if (copy_from_user(devname, optval, optlen))
541 goto out;
542
000ba2e4
DM		 543 index = 0;
544 if (devname[0] != '\0') {
bf8e56bf 545 struct net_device *dev;
4878809f 546
bf8e56bf
ED		 547 rcu_read_lock();
548 dev = dev_get_by_name_rcu(net, devname);
549 if (dev)
550 index = dev->ifindex;
551 rcu_read_unlock();
4878809f
DM		 552 ret = -ENODEV;
553 if (!dev)
554 goto out;
4878809f
DM		 555 }
556
557 lock_sock(sk);
558 sk->sk_bound_dev_if = index;
559 sk_dst_reset(sk);
560 release_sock(sk);
561
562 ret = 0;
563
564out:
565#endif
566
567 return ret;
568}
569
c91f6df2
BH		 570static int sock_getbindtodevice(struct sock *sk, char __user *optval,
571 int __user *optlen, int len)
572{
573 int ret = -ENOPROTOOPT;
574#ifdef CONFIG_NETDEVICES
575 struct net *net = sock_net(sk);
576 struct net_device *dev;
577 char devname[IFNAMSIZ];
578 unsigned seq;
579
580 if (sk->sk_bound_dev_if == 0) {
581 len = 0;
582 goto zero;
583 }
584
585 ret = -EINVAL;
586 if (len < IFNAMSIZ)
587 goto out;
588
589retry:
30e6c9fa 590 seq = read_seqcount_begin(&devnet_rename_seq);
c91f6df2
BH		 591 rcu_read_lock();
592 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
593 ret = -ENODEV;
594 if (!dev) {
595 rcu_read_unlock();
596 goto out;
597 }
598
599 strcpy(devname, dev->name);
600 rcu_read_unlock();
30e6c9fa 601 if (read_seqcount_retry(&devnet_rename_seq, seq))
c91f6df2
BH		 602 goto retry;
603
604 len = strlen(devname) + 1;
605
606 ret = -EFAULT;
607 if (copy_to_user(optval, devname, len))
608 goto out;
609
610zero:
611 ret = -EFAULT;
612 if (put_user(len, optlen))
613 goto out;
614
615 ret = 0;
616
617out:
618#endif
619
620 return ret;
621}
622
c0ef877b
PE		 623static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
624{
625 if (valbool)
626 sock_set_flag(sk, bit);
627 else
628 sock_reset_flag(sk, bit);
629}
630
1da177e4
LT		 631/*
632 * This is meant for all protocols to use and covers goings on
633 * at the socket level. Everything here is generic.
634 */
635
636int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 637 char __user *optval, unsigned int optlen)
1da177e4 638{
2a91525c 639 struct sock *sk = sock->sk;
1da177e4
LT		 640 int val;
641 int valbool;
642 struct linger ling;
643 int ret = 0;
4ec93edb 644
1da177e4
LT		 645 /*
646 * Options without arguments
647 */
648
4878809f 649 if (optname == SO_BINDTODEVICE)
c91f6df2 650 return sock_setbindtodevice(sk, optval, optlen);
4878809f 651
e71a4783
SH		 652 if (optlen < sizeof(int))
653 return -EINVAL;
4ec93edb 654
1da177e4
LT		 655 if (get_user(val, (int __user *)optval))
656 return -EFAULT;
4ec93edb 657
2a91525c 658 valbool = val ? 1 : 0;
1da177e4
LT		 659
660 lock_sock(sk);
661
2a91525c 662 switch (optname) {
e71a4783 663 case SO_DEBUG:
2a91525c 664 if (val && !capable(CAP_NET_ADMIN))
e71a4783 665 ret = -EACCES;
2a91525c 666 else
c0ef877b 667 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 668 break;
669 case SO_REUSEADDR:
4a17fd52 670 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 671 break;
055dc21a
TH		 672 case SO_REUSEPORT:
673 sk->sk_reuseport = valbool;
674 break;
e71a4783 675 case SO_TYPE:
49c794e9 676 case SO_PROTOCOL:
0d6038ee 677 case SO_DOMAIN:
e71a4783
SH		 678 case SO_ERROR:
679 ret = -ENOPROTOOPT;
680 break;
681 case SO_DONTROUTE:
c0ef877b 682 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 683 break;
684 case SO_BROADCAST:
685 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
686 break;
687 case SO_SNDBUF:
688 /* Don't error on this BSD doesn't and if you think
82981930
ED		 689 * about it this is right. Otherwise apps have to
690 * play 'guess the biggest size' games. RCVBUF/SNDBUF
691 * are treated in BSD as hints
692 */
693 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 694set_sndbuf:
e71a4783 695 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 696 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
697 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 698 sk->sk_write_space(sk);
699 break;
1da177e4 700
e71a4783
SH		 701 case SO_SNDBUFFORCE:
702 if (!capable(CAP_NET_ADMIN)) {
703 ret = -EPERM;
704 break;
705 }
706 goto set_sndbuf;
b0573dea 707
e71a4783
SH		 708 case SO_RCVBUF:
709 /* Don't error on this BSD doesn't and if you think
82981930
ED		 710 * about it this is right. Otherwise apps have to
711 * play 'guess the biggest size' games. RCVBUF/SNDBUF
712 * are treated in BSD as hints
713 */
714 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 715set_rcvbuf:
e71a4783
SH		 716 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
717 /*
718 * We double it on the way in to account for
719 * "struct sk_buff" etc. overhead. Applications
720 * assume that the SO_RCVBUF setting they make will
721 * allow that much actual data to be received on that
722 * socket.
723 *
724 * Applications are unaware that "struct sk_buff" and
725 * other overheads allocate from the receive buffer
726 * during socket buffer allocation.
727 *
728 * And after considering the possible alternatives,
729 * returning the value we actually used in getsockopt
730 * is the most desirable behavior.
731 */
82981930 732 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 733 break;
734
735 case SO_RCVBUFFORCE:
736 if (!capable(CAP_NET_ADMIN)) {
737 ret = -EPERM;
1da177e4 738 break;
e71a4783
SH		 739 }
740 goto set_rcvbuf;
1da177e4 741
e71a4783 742 case SO_KEEPALIVE:
1da177e4 743#ifdef CONFIG_INET
3e10986d
ED		 744 if (sk->sk_protocol == IPPROTO_TCP &&
745 sk->sk_type == SOCK_STREAM)
e71a4783 746 tcp_set_keepalive(sk, valbool);
1da177e4 747#endif
e71a4783
SH		 748 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
749 break;
750
751 case SO_OOBINLINE:
752 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
753 break;
754
755 case SO_NO_CHECK:
756 sk->sk_no_check = valbool;
757 break;
758
759 case SO_PRIORITY:
5e1fccc0
EB		 760 if ((val >= 0 && val <= 6) ||
761 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 762 sk->sk_priority = val;
763 else
764 ret = -EPERM;
765 break;
766
767 case SO_LINGER:
768 if (optlen < sizeof(ling)) {
769 ret = -EINVAL; /* 1003.1g */
1da177e4 770 break;
e71a4783 771 }
2a91525c 772 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 773 ret = -EFAULT;
1da177e4 774 break;
e71a4783
SH		 775 }
776 if (!ling.l_onoff)
777 sock_reset_flag(sk, SOCK_LINGER);
778 else {
1da177e4 779#if (BITS_PER_LONG == 32)
e71a4783
SH		 780 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
781 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 782 else
e71a4783
SH		 783#endif
784 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
785 sock_set_flag(sk, SOCK_LINGER);
786 }
787 break;
788
789 case SO_BSDCOMPAT:
790 sock_warn_obsolete_bsdism("setsockopt");
791 break;
792
793 case SO_PASSCRED:
794 if (valbool)
795 set_bit(SOCK_PASSCRED, &sock->flags);
796 else
797 clear_bit(SOCK_PASSCRED, &sock->flags);
798 break;
799
800 case SO_TIMESTAMP:
92f37fd2 801 case SO_TIMESTAMPNS:
e71a4783 802 if (valbool) {
92f37fd2
ED		 803 if (optname == SO_TIMESTAMP)
804 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
805 else
806 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 807 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 808 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 809 } else {
e71a4783 810 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 811 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
812 }
e71a4783
SH		 813 break;
814
20d49473
PO		 815 case SO_TIMESTAMPING:
816 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 817 ret = -EINVAL;
20d49473
PO		 818 break;
819 }
820 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
821 val & SOF_TIMESTAMPING_TX_HARDWARE);
822 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
823 val & SOF_TIMESTAMPING_TX_SOFTWARE);
824 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
825 val & SOF_TIMESTAMPING_RX_HARDWARE);
826 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
827 sock_enable_timestamp(sk,
828 SOCK_TIMESTAMPING_RX_SOFTWARE);
829 else
830 sock_disable_timestamp(sk,
08e29af3 831 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 832 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
833 val & SOF_TIMESTAMPING_SOFTWARE);
834 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
835 val & SOF_TIMESTAMPING_SYS_HARDWARE);
836 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
837 val & SOF_TIMESTAMPING_RAW_HARDWARE);
838 break;
839
e71a4783
SH		 840 case SO_RCVLOWAT:
841 if (val < 0)
842 val = INT_MAX;
843 sk->sk_rcvlowat = val ? : 1;
844 break;
845
846 case SO_RCVTIMEO:
847 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
848 break;
849
850 case SO_SNDTIMEO:
851 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
852 break;
1da177e4 853
e71a4783
SH		 854 case SO_ATTACH_FILTER:
855 ret = -EINVAL;
856 if (optlen == sizeof(struct sock_fprog)) {
857 struct sock_fprog fprog;
1da177e4 858
e71a4783
SH		 859 ret = -EFAULT;
860 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 861 break;
e71a4783
SH		 862
863 ret = sk_attach_filter(&fprog, sk);
864 }
865 break;
866
867 case SO_DETACH_FILTER:
55b33325 868 ret = sk_detach_filter(sk);
e71a4783 869 break;
1da177e4 870
d59577b6
VB		 871 case SO_LOCK_FILTER:
872 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
873 ret = -EPERM;
874 else
875 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
876 break;
877
e71a4783
SH		 878 case SO_PASSSEC:
879 if (valbool)
880 set_bit(SOCK_PASSSEC, &sock->flags);
881 else
882 clear_bit(SOCK_PASSSEC, &sock->flags);
883 break;
4a19ec58 884 case SO_MARK:
5e1fccc0 885 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 886 ret = -EPERM;
2a91525c 887 else
4a19ec58 888 sk->sk_mark = val;
4a19ec58 889 break;
877ce7c1 890
1da177e4
LT		 891 /* We implement the SO_SNDLOWAT etc to
892 not be settable (1003.1g 5.3) */
3b885787 893 case SO_RXQ_OVFL:
8083f0fc 894 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 895 break;
6e3e939f
JB		 896
897 case SO_WIFI_STATUS:
898 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
899 break;
900
ef64a54f
PE		 901 case SO_PEEK_OFF:
902 if (sock->ops->set_peek_off)
903 sock->ops->set_peek_off(sk, val);
904 else
905 ret = -EOPNOTSUPP;
906 break;
3bdc0eba
BG		 907
908 case SO_NOFCS:
909 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
910 break;
911
7d4c04fc
KJ		 912 case SO_SELECT_ERR_QUEUE:
913 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
914 break;
915
e71a4783
SH		 916 default:
917 ret = -ENOPROTOOPT;
918 break;
4ec93edb 919 }
1da177e4
LT		 920 release_sock(sk);
921 return ret;
922}
2a91525c 923EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 924
925
3f551f94
EB		 926void cred_to_ucred(struct pid *pid, const struct cred *cred,
927 struct ucred *ucred)
928{
929 ucred->pid = pid_vnr(pid);
930 ucred->uid = ucred->gid = -1;
931 if (cred) {
932 struct user_namespace *current_ns = current_user_ns();
933
b2e4f544
EB		 934 ucred->uid = from_kuid_munged(current_ns, cred->euid);
935 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 936 }
937}
3924773a 938EXPORT_SYMBOL_GPL(cred_to_ucred);
3f551f94 939
1da177e4
LT		 940int sock_getsockopt(struct socket *sock, int level, int optname,
941 char __user *optval, int __user *optlen)
942{
943 struct sock *sk = sock->sk;
4ec93edb 944
e71a4783 945 union {
4ec93edb
YH		 946 int val;
947 struct linger ling;
1da177e4
LT		 948 struct timeval tm;
949 } v;
4ec93edb 950
4d0392be 951 int lv = sizeof(int);
1da177e4 952 int len;
4ec93edb 953
e71a4783 954 if (get_user(len, optlen))
4ec93edb 955 return -EFAULT;
e71a4783 956 if (len < 0)
1da177e4 957 return -EINVAL;
4ec93edb 958
50fee1de 959 memset(&v, 0, sizeof(v));
df0bca04 960
2a91525c 961 switch (optname) {
e71a4783
SH		 962 case SO_DEBUG:
963 v.val = sock_flag(sk, SOCK_DBG);
964 break;
965
966 case SO_DONTROUTE:
967 v.val = sock_flag(sk, SOCK_LOCALROUTE);
968 break;
969
970 case SO_BROADCAST:
1b23a5df 971 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 972 break;
973
974 case SO_SNDBUF:
975 v.val = sk->sk_sndbuf;
976 break;
977
978 case SO_RCVBUF:
979 v.val = sk->sk_rcvbuf;
980 break;
981
982 case SO_REUSEADDR:
983 v.val = sk->sk_reuse;
984 break;
985
055dc21a
TH		 986 case SO_REUSEPORT:
987 v.val = sk->sk_reuseport;
988 break;
989
e71a4783 990 case SO_KEEPALIVE:
1b23a5df 991 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 992 break;
993
994 case SO_TYPE:
995 v.val = sk->sk_type;
996 break;
997
49c794e9
JE		 998 case SO_PROTOCOL:
999 v.val = sk->sk_protocol;
1000 break;
1001
0d6038ee
JE		 1002 case SO_DOMAIN:
1003 v.val = sk->sk_family;
1004 break;
1005
e71a4783
SH		 1006 case SO_ERROR:
1007 v.val = -sock_error(sk);
2a91525c 1008 if (v.val == 0)
e71a4783
SH		 1009 v.val = xchg(&sk->sk_err_soft, 0);
1010 break;
1011
1012 case SO_OOBINLINE:
1b23a5df 1013 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1014 break;
1015
1016 case SO_NO_CHECK:
1017 v.val = sk->sk_no_check;
1018 break;
1019
1020 case SO_PRIORITY:
1021 v.val = sk->sk_priority;
1022 break;
1023
1024 case SO_LINGER:
1025 lv = sizeof(v.ling);
1b23a5df 1026 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1027 v.ling.l_linger = sk->sk_lingertime / HZ;
1028 break;
1029
1030 case SO_BSDCOMPAT:
1031 sock_warn_obsolete_bsdism("getsockopt");
1032 break;
1033
1034 case SO_TIMESTAMP:
92f37fd2
ED		 1035 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1036 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1037 break;
1038
1039 case SO_TIMESTAMPNS:
1040 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1041 break;
1042
20d49473
PO		 1043 case SO_TIMESTAMPING:
1044 v.val = 0;
1045 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
1046 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
1047 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
1048 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
1049 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
1050 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
1051 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1052 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
1053 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
1054 v.val |= SOF_TIMESTAMPING_SOFTWARE;
1055 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
1056 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
1057 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
1058 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
1059 break;
1060
e71a4783 1061 case SO_RCVTIMEO:
2a91525c 1062 lv = sizeof(struct timeval);
e71a4783
SH		 1063 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1064 v.tm.tv_sec = 0;
1065 v.tm.tv_usec = 0;
1066 } else {
1067 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1068 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1069 }
1070 break;
1071
1072 case SO_SNDTIMEO:
2a91525c 1073 lv = sizeof(struct timeval);
e71a4783
SH		 1074 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1075 v.tm.tv_sec = 0;
1076 v.tm.tv_usec = 0;
1077 } else {
1078 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1079 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1080 }
1081 break;
1da177e4 1082
e71a4783
SH		 1083 case SO_RCVLOWAT:
1084 v.val = sk->sk_rcvlowat;
1085 break;
1da177e4 1086
e71a4783 1087 case SO_SNDLOWAT:
2a91525c 1088 v.val = 1;
e71a4783 1089 break;
1da177e4 1090
e71a4783 1091 case SO_PASSCRED:
82981930 1092 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1093 break;
1da177e4 1094
e71a4783 1095 case SO_PEERCRED:
109f6e39
EB		 1096 {
1097 struct ucred peercred;
1098 if (len > sizeof(peercred))
1099 len = sizeof(peercred);
1100 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1101 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1102 return -EFAULT;
1103 goto lenout;
109f6e39 1104 }
1da177e4 1105
e71a4783
SH		 1106 case SO_PEERNAME:
1107 {
1108 char address[128];
1109
1110 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1111 return -ENOTCONN;
1112 if (lv < len)
1113 return -EINVAL;
1114 if (copy_to_user(optval, address, len))
1115 return -EFAULT;
1116 goto lenout;
1117 }
1da177e4 1118
e71a4783
SH		 1119 /* Dubious BSD thing... Probably nobody even uses it, but
1120 * the UNIX standard wants it for whatever reason... -DaveM
1121 */
1122 case SO_ACCEPTCONN:
1123 v.val = sk->sk_state == TCP_LISTEN;
1124 break;
1da177e4 1125
e71a4783 1126 case SO_PASSSEC:
82981930 1127 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1128 break;
877ce7c1 1129
e71a4783
SH		 1130 case SO_PEERSEC:
1131 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1132
4a19ec58
LAT		 1133 case SO_MARK:
1134 v.val = sk->sk_mark;
1135 break;
1136
3b885787 1137 case SO_RXQ_OVFL:
1b23a5df 1138 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1139 break;
1140
6e3e939f 1141 case SO_WIFI_STATUS:
1b23a5df 1142 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1143 break;
1144
ef64a54f
PE		 1145 case SO_PEEK_OFF:
1146 if (!sock->ops->set_peek_off)
1147 return -EOPNOTSUPP;
1148
1149 v.val = sk->sk_peek_off;
1150 break;
bc2f7996 1151 case SO_NOFCS:
1b23a5df 1152 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1153 break;
c91f6df2 1154
f7b86bfe 1155 case SO_BINDTODEVICE:
c91f6df2
BH		 1156 return sock_getbindtodevice(sk, optval, optlen, len);
1157
a8fc9277
PE		 1158 case SO_GET_FILTER:
1159 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1160 if (len < 0)
1161 return len;
1162
1163 goto lenout;
c91f6df2 1164
d59577b6
VB		 1165 case SO_LOCK_FILTER:
1166 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1167 break;
1168
7d4c04fc
KJ		 1169 case SO_SELECT_ERR_QUEUE:
1170 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1171 break;
1172
e71a4783
SH		 1173 default:
1174 return -ENOPROTOOPT;
1da177e4 1175 }
e71a4783 1176
1da177e4
LT		 1177 if (len > lv)
1178 len = lv;
1179 if (copy_to_user(optval, &v, len))
1180 return -EFAULT;
1181lenout:
4ec93edb
YH		 1182 if (put_user(len, optlen))
1183 return -EFAULT;
1184 return 0;
1da177e4
LT		 1185}
1186
a5b5bb9a
IM		 1187/*
1188 * Initialize an sk_lock.
1189 *
1190 * (We also register the sk_lock with the lock validator.)
1191 */
b6f99a21 1192static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1193{
ed07536e
PZ		 1194 sock_lock_init_class_and_name(sk,
1195 af_family_slock_key_strings[sk->sk_family],
1196 af_family_slock_keys + sk->sk_family,
1197 af_family_key_strings[sk->sk_family],
1198 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1199}
1200
4dc6dc71
ED		 1201/*
1202 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1203 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1204 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1205 */
f1a6c4da
PE		 1206static void sock_copy(struct sock *nsk, const struct sock *osk)
1207{
1208#ifdef CONFIG_SECURITY_NETWORK
1209 void *sptr = nsk->sk_security;
1210#endif
68835aba
ED		 1211 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1212
1213 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1214 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1215
f1a6c4da
PE		 1216#ifdef CONFIG_SECURITY_NETWORK
1217 nsk->sk_security = sptr;
1218 security_sk_clone(osk, nsk);
1219#endif
1220}
1221
fcbdf09d
OP		 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
8fb974c9 1299#if IS_ENABLED(CONFIG_NET_CLS_CGROUP)
211d2f97 1300void sock_update_classid(struct sock *sk)
f8451725 1301{
1144182a 1302 u32 classid;
f8451725 1303
211d2f97 1304 classid = task_cls_classid(current);
3afa6d00 1305 if (classid != sk->sk_classid)
f8451725
HX		 1306 sk->sk_classid = classid;
1307}
82862742 1308EXPORT_SYMBOL(sock_update_classid);
8fb974c9 1309#endif
5bc1421e 1310
51e4e7fa 1311#if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
6ffd4641 1312void sock_update_netprioidx(struct sock *sk)
5bc1421e 1313{
5bc1421e
NH		 1314 if (in_interrupt())
1315 return;
2b73bc65 1316
6ffd4641 1317 sk->sk_cgrp_prioidx = task_netprioidx(current);
5bc1421e
NH		 1318}
1319EXPORT_SYMBOL_GPL(sock_update_netprioidx);
f8451725
HX		 1320#endif
1321
1da177e4
LT		 1322/**
1323 * sk_alloc - All socket objects are allocated here
c4ea43c5 1324 * @net: the applicable net namespace
4dc3b16b
PP		 1325 * @family: protocol family
1326 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1327 * @prot: struct proto associated with this new sock instance
1da177e4 1328 */
1b8d7ae4 1329struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1330 struct proto *prot)
1da177e4 1331{
c308c1b2 1332 struct sock *sk;
1da177e4 1333
154adbc8 1334 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1335 if (sk) {
154adbc8
PE		 1336 sk->sk_family = family;
1337 /*
1338 * See comment in struct sock definition to understand
1339 * why we need sk_prot_creator -acme
1340 */
1341 sk->sk_prot = sk->sk_prot_creator = prot;
1342 sock_lock_init(sk);
3b1e0a65 1343 sock_net_set(sk, get_net(net));
d66ee058 1344 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1345
211d2f97 1346 sock_update_classid(sk);
6ffd4641 1347 sock_update_netprioidx(sk);
1da177e4 1348 }
a79af59e 1349
2e4afe7b 1350 return sk;
1da177e4 1351}
2a91525c 1352EXPORT_SYMBOL(sk_alloc);
1da177e4 1353
2b85a34e 1354static void __sk_free(struct sock *sk)
1da177e4
LT		 1355{
1356 struct sk_filter *filter;
1da177e4
LT		 1357
1358 if (sk->sk_destruct)
1359 sk->sk_destruct(sk);
1360
a898def2
PM		 1361 filter = rcu_dereference_check(sk->sk_filter,
1362 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1363 if (filter) {
309dd5fc 1364 sk_filter_uncharge(sk, filter);
a9b3cd7f 1365 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1366 }
1367
08e29af3 1368 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1369
1370 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1371 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1372 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1373
109f6e39
EB		 1374 if (sk->sk_peer_cred)
1375 put_cred(sk->sk_peer_cred);
1376 put_pid(sk->sk_peer_pid);
3b1e0a65 1377 put_net(sock_net(sk));
c308c1b2 1378 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1379}
2b85a34e
ED		 1380
1381void sk_free(struct sock *sk)
1382{
1383 /*
25985edc 1384 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1385 * some packets are still in some tx queue.
1386 * If not null, sock_wfree() will call __sk_free(sk) later
1387 */
1388 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1389 __sk_free(sk);
1390}
2a91525c 1391EXPORT_SYMBOL(sk_free);
1da177e4 1392
edf02087 1393/*
25985edc
LDM		 1394 * Last sock_put should drop reference to sk->sk_net. It has already
1395 * been dropped in sk_change_net. Taking reference to stopping namespace
edf02087 1396 * is not an option.
25985edc 1397 * Take reference to a socket to remove it from hash _alive_ and after that
edf02087
DL		 1398 * destroy it in the context of init_net.
1399 */
1400void sk_release_kernel(struct sock *sk)
1401{
1402 if (sk == NULL || sk->sk_socket == NULL)
1403 return;
1404
1405 sock_hold(sk);
1406 sock_release(sk->sk_socket);
65a18ec5 1407 release_net(sock_net(sk));
3b1e0a65 1408 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1409 sock_put(sk);
1410}
45af1754 1411EXPORT_SYMBOL(sk_release_kernel);
edf02087 1412
475f1b52
SR		 1413static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1414{
1415 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1416 sock_update_memcg(newsk);
1417}
1418
e56c57d0
ED		 1419/**
1420 * sk_clone_lock - clone a socket, and lock its clone
1421 * @sk: the socket to clone
1422 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1423 *
1424 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1425 */
1426struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1427{
8fd1d178 1428 struct sock *newsk;
87d11ceb 1429
8fd1d178 1430 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1431 if (newsk != NULL) {
1432 struct sk_filter *filter;
1433
892c141e 1434 sock_copy(newsk, sk);
87d11ceb
ACM		 1435
1436 /* SANITY */
3b1e0a65 1437 get_net(sock_net(newsk));
87d11ceb
ACM		 1438 sk_node_init(&newsk->sk_node);
1439 sock_lock_init(newsk);
1440 bh_lock_sock(newsk);
fa438ccf 1441 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1442 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1443
1444 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1445 /*
1446 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1447 */
1448 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1449 atomic_set(&newsk->sk_omem_alloc, 0);
1450 skb_queue_head_init(&newsk->sk_receive_queue);
1451 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1452#ifdef CONFIG_NET_DMA
1453 skb_queue_head_init(&newsk->sk_async_wait_queue);
1454#endif
87d11ceb 1455
b6c6712a 1456 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1457 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1458 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1459 af_callback_keys + newsk->sk_family,
1460 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1461
1462 newsk->sk_dst_cache = NULL;
1463 newsk->sk_wmem_queued = 0;
1464 newsk->sk_forward_alloc = 0;
1465 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1466 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1467
1468 sock_reset_flag(newsk, SOCK_DONE);
1469 skb_queue_head_init(&newsk->sk_error_queue);
1470
0d7da9dd 1471 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb
ACM		 1472 if (filter != NULL)
1473 sk_filter_charge(newsk, filter);
1474
1475 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1476 /* It is still raw copy of parent, so invalidate
1477 * destructor and make plain sk_free() */
1478 newsk->sk_destruct = NULL;
b0691c8e 1479 bh_unlock_sock(newsk);
87d11ceb
ACM		 1480 sk_free(newsk);
1481 newsk = NULL;
1482 goto out;
1483 }
1484
1485 newsk->sk_err = 0;
1486 newsk->sk_priority = 0;
4dc6dc71
ED		 1487 /*
1488 * Before updating sk_refcnt, we must commit prior changes to memory
1489 * (Documentation/RCU/rculist_nulls.txt for details)
1490 */
1491 smp_wmb();
87d11ceb
ACM		 1492 atomic_set(&newsk->sk_refcnt, 2);
1493
1494 /*
1495 * Increment the counter in the same struct proto as the master
1496 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1497 * is the same as sk->sk_prot->socks, as this field was copied
1498 * with memcpy).
1499 *
1500 * This _changes_ the previous behaviour, where
1501 * tcp_create_openreq_child always was incrementing the
1502 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1503 * to be taken into account in all callers. -acme
1504 */
1505 sk_refcnt_debug_inc(newsk);
972692e0 1506 sk_set_socket(newsk, NULL);
43815482 1507 newsk->sk_wq = NULL;
87d11ceb 1508
f3f511e1
GC		 1509 sk_update_clone(sk, newsk);
1510
87d11ceb 1511 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1512 sk_sockets_allocated_inc(newsk);
704da560 1513
08e29af3 1514 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1515 net_enable_timestamp();
87d11ceb
ACM		 1516 }
1517out:
1518 return newsk;
1519}
e56c57d0 1520EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1521
9958089a
AK		 1522void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1523{
1524 __sk_dst_set(sk, dst);
1525 sk->sk_route_caps = dst->dev->features;
1526 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1527 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1528 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1529 if (sk_can_gso(sk)) {
82cc1a7a 1530 if (dst->header_len) {
9958089a 1531 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1532 } else {
9958089a 1533 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1534 sk->sk_gso_max_size = dst->dev->gso_max_size;
1485348d 1535 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
82cc1a7a 1536 }
9958089a
AK		 1537 }
1538}
1539EXPORT_SYMBOL_GPL(sk_setup_caps);
1540
1da177e4
LT		 1541/*
1542 * Simple resource managers for sockets.
1543 */
1544
1545
4ec93edb
YH		 1546/*
1547 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1548 */
1549void sock_wfree(struct sk_buff *skb)
1550{
1551 struct sock *sk = skb->sk;
d99927f4 1552 unsigned int len = skb->truesize;
1da177e4 1553
d99927f4
ED		 1554 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1555 /*
1556 * Keep a reference on sk_wmem_alloc, this will be released
1557 * after sk_write_space() call
1558 */
1559 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1560 sk->sk_write_space(sk);
d99927f4
ED		 1561 len = 1;
1562 }
2b85a34e 1563 /*
d99927f4
ED		 1564 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1565 * could not do because of in-flight packets
2b85a34e 1566 */
d99927f4 1567 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1568 __sk_free(sk);
1da177e4 1569}
2a91525c 1570EXPORT_SYMBOL(sock_wfree);
1da177e4 1571
4ec93edb
YH		 1572/*
1573 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1574 */
1575void sock_rfree(struct sk_buff *skb)
1576{
1577 struct sock *sk = skb->sk;
d361fd59 1578 unsigned int len = skb->truesize;
1da177e4 1579
d361fd59
ED		 1580 atomic_sub(len, &sk->sk_rmem_alloc);
1581 sk_mem_uncharge(sk, len);
1da177e4 1582}
2a91525c 1583EXPORT_SYMBOL(sock_rfree);
1da177e4 1584
41063e9d
DM		 1585void sock_edemux(struct sk_buff *skb)
1586{
e812347c
ED		 1587 struct sock *sk = skb->sk;
1588
1c463e57 1589#ifdef CONFIG_INET
e812347c
ED		 1590 if (sk->sk_state == TCP_TIME_WAIT)
1591 inet_twsk_put(inet_twsk(sk));
1592 else
1c463e57 1593#endif
e812347c 1594 sock_put(sk);
41063e9d
DM		 1595}
1596EXPORT_SYMBOL(sock_edemux);
1da177e4 1597
976d0201 1598kuid_t sock_i_uid(struct sock *sk)
1da177e4 1599{
976d0201 1600 kuid_t uid;
1da177e4 1601
f064af1e 1602 read_lock_bh(&sk->sk_callback_lock);
976d0201 1603 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1604 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1605 return uid;
1606}
2a91525c 1607EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1608
1609unsigned long sock_i_ino(struct sock *sk)
1610{
1611 unsigned long ino;
1612
f064af1e 1613 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1614 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1615 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1616 return ino;
1617}
2a91525c 1618EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1619
1620/*
1621 * Allocate a skb from the socket's send buffer.
1622 */
86a76caf 1623struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1624 gfp_t priority)
1da177e4
LT		 1625{
1626 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1627 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1628 if (skb) {
1629 skb_set_owner_w(skb, sk);
1630 return skb;
1631 }
1632 }
1633 return NULL;
1634}
2a91525c 1635EXPORT_SYMBOL(sock_wmalloc);
1da177e4
LT		 1636
1637/*
1638 * Allocate a skb from the socket's receive buffer.
4ec93edb 1639 */
86a76caf 1640struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1641 gfp_t priority)
1da177e4
LT		 1642{
1643 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1644 struct sk_buff *skb = alloc_skb(size, priority);
1645 if (skb) {
1646 skb_set_owner_r(skb, sk);
1647 return skb;
1648 }
1649 }
1650 return NULL;
1651}
1652
4ec93edb 1653/*
1da177e4 1654 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1655 */
dd0fc66f 1656void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1657{
95c96174 1658 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1659 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1660 void *mem;
1661 /* First do the add, to avoid the race if kmalloc
4ec93edb 1662 * might sleep.
1da177e4
LT		 1663 */
1664 atomic_add(size, &sk->sk_omem_alloc);
1665 mem = kmalloc(size, priority);
1666 if (mem)
1667 return mem;
1668 atomic_sub(size, &sk->sk_omem_alloc);
1669 }
1670 return NULL;
1671}
2a91525c 1672EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1673
1674/*
1675 * Free an option memory block.
1676 */
1677void sock_kfree_s(struct sock *sk, void *mem, int size)
1678{
1679 kfree(mem);
1680 atomic_sub(size, &sk->sk_omem_alloc);
1681}
2a91525c 1682EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1683
1684/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1685 I think, these locks should be removed for datagram sockets.
1686 */
2a91525c 1687static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1688{
1689 DEFINE_WAIT(wait);
1690
1691 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1692 for (;;) {
1693 if (!timeo)
1694 break;
1695 if (signal_pending(current))
1696 break;
1697 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1698 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1699 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1700 break;
1701 if (sk->sk_shutdown & SEND_SHUTDOWN)
1702 break;
1703 if (sk->sk_err)
1704 break;
1705 timeo = schedule_timeout(timeo);
1706 }
aa395145 1707 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1708 return timeo;
1709}
1710
1711
1712/*
1713 * Generic send/receive buffer handlers
1714 */
1715
4cc7f68d
HX		 1716struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1717 unsigned long data_len, int noblock,
1718 int *errcode)
1da177e4
LT		 1719{
1720 struct sk_buff *skb;
7d877f3b 1721 gfp_t gfp_mask;
1da177e4
LT		 1722 long timeo;
1723 int err;
cc9b17ad
JW		 1724 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1725
1726 err = -EMSGSIZE;
1727 if (npages > MAX_SKB_FRAGS)
1728 goto failure;
1da177e4
LT		 1729
1730 gfp_mask = sk->sk_allocation;
1731 if (gfp_mask & __GFP_WAIT)
1732 gfp_mask |= __GFP_REPEAT;
1733
1734 timeo = sock_sndtimeo(sk, noblock);
1735 while (1) {
1736 err = sock_error(sk);
1737 if (err != 0)
1738 goto failure;
1739
1740 err = -EPIPE;
1741 if (sk->sk_shutdown & SEND_SHUTDOWN)
1742 goto failure;
1743
1744 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1745 skb = alloc_skb(header_len, gfp_mask);
1da177e4 1746 if (skb) {
1da177e4
LT		 1747 int i;
1748
1749 /* No pages, we're done... */
1750 if (!data_len)
1751 break;
1752
1da177e4
LT		 1753 skb->truesize += data_len;
1754 skb_shinfo(skb)->nr_frags = npages;
1755 for (i = 0; i < npages; i++) {
1756 struct page *page;
1da177e4
LT		 1757
1758 page = alloc_pages(sk->sk_allocation, 0);
1759 if (!page) {
1760 err = -ENOBUFS;
1761 skb_shinfo(skb)->nr_frags = i;
1762 kfree_skb(skb);
1763 goto failure;
1764 }
1765
ea2ab693
IC		 1766 __skb_fill_page_desc(skb, i,
1767 page, 0,
1768 (data_len >= PAGE_SIZE ?
1769 PAGE_SIZE :
1770 data_len));
1da177e4
LT		 1771 data_len -= PAGE_SIZE;
1772 }
1773
1774 /* Full success... */
1775 break;
1776 }
1777 err = -ENOBUFS;
1778 goto failure;
1779 }
1780 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1781 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1782 err = -EAGAIN;
1783 if (!timeo)
1784 goto failure;
1785 if (signal_pending(current))
1786 goto interrupted;
1787 timeo = sock_wait_for_wmem(sk, timeo);
1788 }
1789
1790 skb_set_owner_w(skb, sk);
1791 return skb;
1792
1793interrupted:
1794 err = sock_intr_errno(timeo);
1795failure:
1796 *errcode = err;
1797 return NULL;
1798}
4cc7f68d 1799EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1800
4ec93edb 1801struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1802 int noblock, int *errcode)
1803{
1804 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1805}
2a91525c 1806EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1807
5640f768
ED		 1808/* On 32bit arches, an skb frag is limited to 2^15 */
1809#define SKB_FRAG_PAGE_ORDER get_order(32768)
1810
1811bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1812{
1813 int order;
1814
1815 if (pfrag->page) {
1816 if (atomic_read(&pfrag->page->_count) == 1) {
1817 pfrag->offset = 0;
1818 return true;
1819 }
1820 if (pfrag->offset < pfrag->size)
1821 return true;
1822 put_page(pfrag->page);
1823 }
1824
1825 /* We restrict high order allocations to users that can afford to wait */
1826 order = (sk->sk_allocation & __GFP_WAIT) ? SKB_FRAG_PAGE_ORDER : 0;
1827
1828 do {
1829 gfp_t gfp = sk->sk_allocation;
1830
1831 if (order)
1832 gfp |= __GFP_COMP | __GFP_NOWARN;
1833 pfrag->page = alloc_pages(gfp, order);
1834 if (likely(pfrag->page)) {
1835 pfrag->offset = 0;
1836 pfrag->size = PAGE_SIZE << order;
1837 return true;
1838 }
1839 } while (--order >= 0);
1840
1841 sk_enter_memory_pressure(sk);
1842 sk_stream_moderate_sndbuf(sk);
1843 return false;
1844}
1845EXPORT_SYMBOL(sk_page_frag_refill);
1846
1da177e4 1847static void __lock_sock(struct sock *sk)
f39234d6
NK		 1848 __releases(&sk->sk_lock.slock)
1849 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1850{
1851 DEFINE_WAIT(wait);
1852
e71a4783 1853 for (;;) {
1da177e4
LT		 1854 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1855 TASK_UNINTERRUPTIBLE);
1856 spin_unlock_bh(&sk->sk_lock.slock);
1857 schedule();
1858 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1859 if (!sock_owned_by_user(sk))
1da177e4
LT		 1860 break;
1861 }
1862 finish_wait(&sk->sk_lock.wq, &wait);
1863}
1864
1865static void __release_sock(struct sock *sk)
f39234d6
NK		 1866 __releases(&sk->sk_lock.slock)
1867 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1868{
1869 struct sk_buff *skb = sk->sk_backlog.head;
1870
1871 do {
1872 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1873 bh_unlock_sock(sk);
1874
1875 do {
1876 struct sk_buff *next = skb->next;
1877
e4cbb02a 1878 prefetch(next);
7fee226a 1879 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1880 skb->next = NULL;
c57943a1 1881 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1882
1883 /*
1884 * We are in process context here with softirqs
1885 * disabled, use cond_resched_softirq() to preempt.
1886 * This is safe to do because we've taken the backlog
1887 * queue private:
1888 */
1889 cond_resched_softirq();
1890
1891 skb = next;
1892 } while (skb != NULL);
1893
1894 bh_lock_sock(sk);
e71a4783 1895 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1896
1897 /*
1898 * Doing the zeroing here guarantee we can not loop forever
1899 * while a wild producer attempts to flood us.
1900 */
1901 sk->sk_backlog.len = 0;
1da177e4
LT		 1902}
1903
1904/**
1905 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1906 * @sk: sock to wait on
1907 * @timeo: for how long
1da177e4
LT		 1908 *
1909 * Now socket state including sk->sk_err is changed only under lock,
1910 * hence we may omit checks after joining wait queue.
1911 * We check receive queue before schedule() only as optimization;
1912 * it is very likely that release_sock() added new data.
1913 */
1914int sk_wait_data(struct sock *sk, long *timeo)
1915{
1916 int rc;
1917 DEFINE_WAIT(wait);
1918
aa395145 1919 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1920 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1921 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1922 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1923 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1924 return rc;
1925}
1da177e4
LT		 1926EXPORT_SYMBOL(sk_wait_data);
1927
3ab224be
HA		 1928/**
1929 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1930 * @sk: socket
1931 * @size: memory size to allocate
1932 * @kind: allocation type
1933 *
1934 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1935 * rmem allocation. This function assumes that protocols which have
1936 * memory_pressure use sk_wmem_queued as write buffer accounting.
1937 */
1938int __sk_mem_schedule(struct sock *sk, int size, int kind)
1939{
1940 struct proto *prot = sk->sk_prot;
1941 int amt = sk_mem_pages(size);
8d987e5c 1942 long allocated;
e1aab161 1943 int parent_status = UNDER_LIMIT;
3ab224be
HA		 1944
1945 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 1946
e1aab161 1947 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 1948
1949 /* Under limit. */
e1aab161
GC		 1950 if (parent_status == UNDER_LIMIT &&
1951 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 1952 sk_leave_memory_pressure(sk);
3ab224be
HA		 1953 return 1;
1954 }
1955
e1aab161
GC		 1956 /* Under pressure. (we or our parents) */
1957 if ((parent_status > SOFT_LIMIT) ||
1958 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 1959 sk_enter_memory_pressure(sk);
3ab224be 1960
e1aab161
GC		 1961 /* Over hard limit (we or our parents) */
1962 if ((parent_status == OVER_LIMIT) ||
1963 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 1964 goto suppress_allocation;
1965
1966 /* guarantee minimum buffer size under pressure */
1967 if (kind == SK_MEM_RECV) {
1968 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1969 return 1;
180d8cd9 1970
3ab224be
HA		 1971 } else { /* SK_MEM_SEND */
1972 if (sk->sk_type == SOCK_STREAM) {
1973 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1974 return 1;
1975 } else if (atomic_read(&sk->sk_wmem_alloc) <
1976 prot->sysctl_wmem[0])
1977 return 1;
1978 }
1979
180d8cd9 1980 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 1981 int alloc;
1982
180d8cd9 1983 if (!sk_under_memory_pressure(sk))
1748376b 1984 return 1;
180d8cd9
GC		 1985 alloc = sk_sockets_allocated_read_positive(sk);
1986 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 1987 sk_mem_pages(sk->sk_wmem_queued +
1988 atomic_read(&sk->sk_rmem_alloc) +
1989 sk->sk_forward_alloc))
1990 return 1;
1991 }
1992
1993suppress_allocation:
1994
1995 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1996 sk_stream_moderate_sndbuf(sk);
1997
1998 /* Fail only if socket is _under_ its sndbuf.
1999 * In this case we cannot block, so that we have to fail.
2000 */
2001 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2002 return 1;
2003 }
2004
3847ce32
SM		 2005 trace_sock_exceed_buf_limit(sk, prot, allocated);
2006
3ab224be
HA		 2007 /* Alas. Undo changes. */
2008 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2009
0e90b31f 2010 sk_memory_allocated_sub(sk, amt);
180d8cd9 2011
3ab224be
HA		 2012 return 0;
2013}
3ab224be
HA		 2014EXPORT_SYMBOL(__sk_mem_schedule);
2015
2016/**
2017 * __sk_reclaim - reclaim memory_allocated
2018 * @sk: socket
2019 */
2020void __sk_mem_reclaim(struct sock *sk)
2021{
180d8cd9 2022 sk_memory_allocated_sub(sk,
0e90b31f 2023 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
3ab224be
HA		 2024 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
2025
180d8cd9
GC		 2026 if (sk_under_memory_pressure(sk) &&
2027 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2028 sk_leave_memory_pressure(sk);
3ab224be 2029}
3ab224be
HA		 2030EXPORT_SYMBOL(__sk_mem_reclaim);
2031
2032
1da177e4
LT		 2033/*
2034 * Set of default routines for initialising struct proto_ops when
2035 * the protocol does not support a particular function. In certain
2036 * cases where it makes no sense for a protocol to have a "do nothing"
2037 * function, some default processing is provided.
2038 */
2039
2040int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2041{
2042 return -EOPNOTSUPP;
2043}
2a91525c 2044EXPORT_SYMBOL(sock_no_bind);
1da177e4 2045
4ec93edb 2046int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2047 int len, int flags)
2048{
2049 return -EOPNOTSUPP;
2050}
2a91525c 2051EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2052
2053int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2054{
2055 return -EOPNOTSUPP;
2056}
2a91525c 2057EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2058
2059int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2060{
2061 return -EOPNOTSUPP;
2062}
2a91525c 2063EXPORT_SYMBOL(sock_no_accept);
1da177e4 2064
4ec93edb 2065int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2066 int *len, int peer)
2067{
2068 return -EOPNOTSUPP;
2069}
2a91525c 2070EXPORT_SYMBOL(sock_no_getname);
1da177e4 2071
2a91525c 2072unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2073{
2074 return 0;
2075}
2a91525c 2076EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2077
2078int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2079{
2080 return -EOPNOTSUPP;
2081}
2a91525c 2082EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2083
2084int sock_no_listen(struct socket *sock, int backlog)
2085{
2086 return -EOPNOTSUPP;
2087}
2a91525c 2088EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2089
2090int sock_no_shutdown(struct socket *sock, int how)
2091{
2092 return -EOPNOTSUPP;
2093}
2a91525c 2094EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2095
2096int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2097 char __user *optval, unsigned int optlen)
1da177e4
LT		 2098{
2099 return -EOPNOTSUPP;
2100}
2a91525c 2101EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2102
2103int sock_no_getsockopt(struct socket *sock, int level, int optname,
2104 char __user *optval, int __user *optlen)
2105{
2106 return -EOPNOTSUPP;
2107}
2a91525c 2108EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 2109
2110int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2111 size_t len)
2112{
2113 return -EOPNOTSUPP;
2114}
2a91525c 2115EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 2116
2117int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2118 size_t len, int flags)
2119{
2120 return -EOPNOTSUPP;
2121}
2a91525c 2122EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2123
2124int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2125{
2126 /* Mirror missing mmap method error code */
2127 return -ENODEV;
2128}
2a91525c 2129EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2130
2131ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2132{
2133 ssize_t res;
2134 struct msghdr msg = {.msg_flags = flags};
2135 struct kvec iov;
2136 char *kaddr = kmap(page);
2137 iov.iov_base = kaddr + offset;
2138 iov.iov_len = size;
2139 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2140 kunmap(page);
2141 return res;
2142}
2a91525c 2143EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2144
2145/*
2146 * Default Socket Callbacks
2147 */
2148
2149static void sock_def_wakeup(struct sock *sk)
2150{
43815482
ED		 2151 struct socket_wq *wq;
2152
2153 rcu_read_lock();
2154 wq = rcu_dereference(sk->sk_wq);
2155 if (wq_has_sleeper(wq))
2156 wake_up_interruptible_all(&wq->wait);
2157 rcu_read_unlock();
1da177e4
LT		 2158}
2159
2160static void sock_def_error_report(struct sock *sk)
2161{
43815482
ED		 2162 struct socket_wq *wq;
2163
2164 rcu_read_lock();
2165 wq = rcu_dereference(sk->sk_wq);
2166 if (wq_has_sleeper(wq))
2167 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2168 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2169 rcu_read_unlock();
1da177e4
LT		 2170}
2171
2172static void sock_def_readable(struct sock *sk, int len)
2173{
43815482
ED		 2174 struct socket_wq *wq;
2175
2176 rcu_read_lock();
2177 wq = rcu_dereference(sk->sk_wq);
2178 if (wq_has_sleeper(wq))
2c6607c6 2179 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2180 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2181 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2182 rcu_read_unlock();
1da177e4
LT		 2183}
2184
2185static void sock_def_write_space(struct sock *sk)
2186{
43815482
ED		 2187 struct socket_wq *wq;
2188
2189 rcu_read_lock();
1da177e4
LT		 2190
2191 /* Do not wake up a writer until he can make "significant"
2192 * progress. --DaveM
2193 */
e71a4783 2194 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2195 wq = rcu_dereference(sk->sk_wq);
2196 if (wq_has_sleeper(wq))
2197 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2198 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2199
2200 /* Should agree with poll, otherwise some programs break */
2201 if (sock_writeable(sk))
8d8ad9d7 2202 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2203 }
2204
43815482 2205 rcu_read_unlock();
1da177e4
LT		 2206}
2207
2208static void sock_def_destruct(struct sock *sk)
2209{
a51482bd 2210 kfree(sk->sk_protinfo);
1da177e4
LT		 2211}
2212
2213void sk_send_sigurg(struct sock *sk)
2214{
2215 if (sk->sk_socket && sk->sk_socket->file)
2216 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2217 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2218}
2a91525c 2219EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2220
2221void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2222 unsigned long expires)
2223{
2224 if (!mod_timer(timer, expires))
2225 sock_hold(sk);
2226}
1da177e4
LT		 2227EXPORT_SYMBOL(sk_reset_timer);
2228
2229void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2230{
25cc4ae9 2231 if (del_timer(timer))
1da177e4
LT		 2232 __sock_put(sk);
2233}
1da177e4
LT		 2234EXPORT_SYMBOL(sk_stop_timer);
2235
2236void sock_init_data(struct socket *sock, struct sock *sk)
2237{
2238 skb_queue_head_init(&sk->sk_receive_queue);
2239 skb_queue_head_init(&sk->sk_write_queue);
2240 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 2241#ifdef CONFIG_NET_DMA
2242 skb_queue_head_init(&sk->sk_async_wait_queue);
2243#endif
1da177e4
LT		 2244
2245 sk->sk_send_head = NULL;
2246
2247 init_timer(&sk->sk_timer);
4ec93edb 2248
1da177e4
LT		 2249 sk->sk_allocation = GFP_KERNEL;
2250 sk->sk_rcvbuf = sysctl_rmem_default;
2251 sk->sk_sndbuf = sysctl_wmem_default;
2252 sk->sk_state = TCP_CLOSE;
972692e0 2253 sk_set_socket(sk, sock);
1da177e4
LT		 2254
2255 sock_set_flag(sk, SOCK_ZAPPED);
2256
e71a4783 2257 if (sock) {
1da177e4 2258 sk->sk_type = sock->type;
43815482 2259 sk->sk_wq = sock->wq;
1da177e4
LT		 2260 sock->sk = sk;
2261 } else
43815482 2262 sk->sk_wq = NULL;
1da177e4 2263
b6c6712a 2264 spin_lock_init(&sk->sk_dst_lock);
1da177e4 2265 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2266 lockdep_set_class_and_name(&sk->sk_callback_lock,
2267 af_callback_keys + sk->sk_family,
2268 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2269
2270 sk->sk_state_change = sock_def_wakeup;
2271 sk->sk_data_ready = sock_def_readable;
2272 sk->sk_write_space = sock_def_write_space;
2273 sk->sk_error_report = sock_def_error_report;
2274 sk->sk_destruct = sock_def_destruct;
2275
5640f768
ED		 2276 sk->sk_frag.page = NULL;
2277 sk->sk_frag.offset = 0;
ef64a54f 2278 sk->sk_peek_off = -1;
1da177e4 2279
109f6e39
EB		 2280 sk->sk_peer_pid = NULL;
2281 sk->sk_peer_cred = NULL;
1da177e4
LT		 2282 sk->sk_write_pending = 0;
2283 sk->sk_rcvlowat = 1;
2284 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2285 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2286
f37f0afb 2287 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2288
06021292
ET		 2289#ifdef CONFIG_NET_LL_RX_POLL
2290 sk->sk_napi_id = 0;
2291#endif
2292
4dc6dc71
ED		 2293 /*
2294 * Before updating sk_refcnt, we must commit prior changes to memory
2295 * (Documentation/RCU/rculist_nulls.txt for details)
2296 */
2297 smp_wmb();
1da177e4 2298 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2299 atomic_set(&sk->sk_drops, 0);
1da177e4 2300}
2a91525c 2301EXPORT_SYMBOL(sock_init_data);
1da177e4 2302
b5606c2d 2303void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2304{
2305 might_sleep();
a5b5bb9a 2306 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2307 if (sk->sk_lock.owned)
1da177e4 2308 __lock_sock(sk);
d2e9117c 2309 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2310 spin_unlock(&sk->sk_lock.slock);
2311 /*
2312 * The sk_lock has mutex_lock() semantics here:
2313 */
fcc70d5f 2314 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2315 local_bh_enable();
1da177e4 2316}
fcc70d5f 2317EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2318
b5606c2d 2319void release_sock(struct sock *sk)
1da177e4 2320{
a5b5bb9a
IM		 2321 /*
2322 * The sk_lock has mutex_unlock() semantics:
2323 */
2324 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2325
2326 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2327 if (sk->sk_backlog.tail)
2328 __release_sock(sk);
46d3ceab
ED		 2329
2330 if (sk->sk_prot->release_cb)
2331 sk->sk_prot->release_cb(sk);
2332
d2e9117c 2333 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 2334 if (waitqueue_active(&sk->sk_lock.wq))
2335 wake_up(&sk->sk_lock.wq);
2336 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2337}
2338EXPORT_SYMBOL(release_sock);
2339
8a74ad60
ED		 2340/**
2341 * lock_sock_fast - fast version of lock_sock
2342 * @sk: socket
2343 *
2344 * This version should be used for very small section, where process wont block
2345 * return false if fast path is taken
2346 * sk_lock.slock locked, owned = 0, BH disabled
2347 * return true if slow path is taken
2348 * sk_lock.slock unlocked, owned = 1, BH enabled
2349 */
2350bool lock_sock_fast(struct sock *sk)
2351{
2352 might_sleep();
2353 spin_lock_bh(&sk->sk_lock.slock);
2354
2355 if (!sk->sk_lock.owned)
2356 /*
2357 * Note : We must disable BH
2358 */
2359 return false;
2360
2361 __lock_sock(sk);
2362 sk->sk_lock.owned = 1;
2363 spin_unlock(&sk->sk_lock.slock);
2364 /*
2365 * The sk_lock has mutex_lock() semantics here:
2366 */
2367 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2368 local_bh_enable();
2369 return true;
2370}
2371EXPORT_SYMBOL(lock_sock_fast);
2372
1da177e4 2373int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2374{
b7aa0bf7 2375 struct timeval tv;
1da177e4 2376 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2377 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2378 tv = ktime_to_timeval(sk->sk_stamp);
2379 if (tv.tv_sec == -1)
1da177e4 2380 return -ENOENT;
b7aa0bf7
ED		 2381 if (tv.tv_sec == 0) {
2382 sk->sk_stamp = ktime_get_real();
2383 tv = ktime_to_timeval(sk->sk_stamp);
2384 }
2385 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2386}
1da177e4
LT		 2387EXPORT_SYMBOL(sock_get_timestamp);
2388
ae40eb1e
ED		 2389int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2390{
2391 struct timespec ts;
2392 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2393 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2394 ts = ktime_to_timespec(sk->sk_stamp);
2395 if (ts.tv_sec == -1)
2396 return -ENOENT;
2397 if (ts.tv_sec == 0) {
2398 sk->sk_stamp = ktime_get_real();
2399 ts = ktime_to_timespec(sk->sk_stamp);
2400 }
2401 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2402}
2403EXPORT_SYMBOL(sock_get_timestampns);
2404
20d49473 2405void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2406{
20d49473 2407 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2408 unsigned long previous_flags = sk->sk_flags;
2409
20d49473
PO		 2410 sock_set_flag(sk, flag);
2411 /*
2412 * we just set one of the two flags which require net
2413 * time stamping, but time stamping might have been on
2414 * already because of the other one
2415 */
08e29af3 2416 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2417 net_enable_timestamp();
1da177e4
LT		 2418 }
2419}
1da177e4
LT		 2420
2421/*
2422 * Get a socket option on an socket.
2423 *
2424 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2425 * asynchronous errors should be reported by getsockopt. We assume
2426 * this means if you specify SO_ERROR (otherwise whats the point of it).
2427 */
2428int sock_common_getsockopt(struct socket *sock, int level, int optname,
2429 char __user *optval, int __user *optlen)
2430{
2431 struct sock *sk = sock->sk;
2432
2433 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2434}
1da177e4
LT		 2435EXPORT_SYMBOL(sock_common_getsockopt);
2436
3fdadf7d 2437#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2438int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2439 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2440{
2441 struct sock *sk = sock->sk;
2442
1e51f951 2443 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2444 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2445 optval, optlen);
3fdadf7d
DM		 2446 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2447}
2448EXPORT_SYMBOL(compat_sock_common_getsockopt);
2449#endif
2450
1da177e4
LT		 2451int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2452 struct msghdr *msg, size_t size, int flags)
2453{
2454 struct sock *sk = sock->sk;
2455 int addr_len = 0;
2456 int err;
2457
2458 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2459 flags & ~MSG_DONTWAIT, &addr_len);
2460 if (err >= 0)
2461 msg->msg_namelen = addr_len;
2462 return err;
2463}
1da177e4
LT		 2464EXPORT_SYMBOL(sock_common_recvmsg);
2465
2466/*
2467 * Set socket options on an inet socket.
2468 */
2469int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2470 char __user *optval, unsigned int optlen)
1da177e4
LT		 2471{
2472 struct sock *sk = sock->sk;
2473
2474 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2475}
1da177e4
LT		 2476EXPORT_SYMBOL(sock_common_setsockopt);
2477
3fdadf7d 2478#ifdef CONFIG_COMPAT
543d9cfe 2479int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2480 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2481{
2482 struct sock *sk = sock->sk;
2483
543d9cfe
ACM		 2484 if (sk->sk_prot->compat_setsockopt != NULL)
2485 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2486 optval, optlen);
3fdadf7d
DM		 2487 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2488}
2489EXPORT_SYMBOL(compat_sock_common_setsockopt);
2490#endif
2491
1da177e4
LT		 2492void sk_common_release(struct sock *sk)
2493{
2494 if (sk->sk_prot->destroy)
2495 sk->sk_prot->destroy(sk);
2496
2497 /*
2498 * Observation: when sock_common_release is called, processes have
2499 * no access to socket. But net still has.
2500 * Step one, detach it from networking:
2501 *
2502 * A. Remove from hash tables.
2503 */
2504
2505 sk->sk_prot->unhash(sk);
2506
2507 /*
2508 * In this point socket cannot receive new packets, but it is possible
2509 * that some packets are in flight because some CPU runs receiver and
2510 * did hash table lookup before we unhashed socket. They will achieve
2511 * receive queue and will be purged by socket destructor.
2512 *
2513 * Also we still have packets pending on receive queue and probably,
2514 * our own packets waiting in device queues. sock_destroy will drain
2515 * receive queue, but transmitted packets will delay socket destruction
2516 * until the last reference will be released.
2517 */
2518
2519 sock_orphan(sk);
2520
2521 xfrm_sk_free_policy(sk);
2522
e6848976 2523 sk_refcnt_debug_release(sk);
5640f768
ED		 2524
2525 if (sk->sk_frag.page) {
2526 put_page(sk->sk_frag.page);
2527 sk->sk_frag.page = NULL;
2528 }
2529
1da177e4
LT		 2530 sock_put(sk);
2531}
1da177e4
LT		 2532EXPORT_SYMBOL(sk_common_release);
2533
13ff3d6f
PE		 2534#ifdef CONFIG_PROC_FS
2535#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2536struct prot_inuse {
2537 int val[PROTO_INUSE_NR];
2538};
13ff3d6f
PE		 2539
2540static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2541
2542#ifdef CONFIG_NET_NS
2543void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2544{
d6d9ca0f 2545 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2546}
2547EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2548
2549int sock_prot_inuse_get(struct net *net, struct proto *prot)
2550{
2551 int cpu, idx = prot->inuse_idx;
2552 int res = 0;
2553
2554 for_each_possible_cpu(cpu)
2555 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2556
2557 return res >= 0 ? res : 0;
2558}
2559EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2560
2c8c1e72 2561static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2562{
2563 net->core.inuse = alloc_percpu(struct prot_inuse);
2564 return net->core.inuse ? 0 : -ENOMEM;
2565}
2566
2c8c1e72 2567static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2568{
2569 free_percpu(net->core.inuse);
2570}
2571
2572static struct pernet_operations net_inuse_ops = {
2573 .init = sock_inuse_init_net,
2574 .exit = sock_inuse_exit_net,
2575};
2576
2577static __init int net_inuse_init(void)
2578{
2579 if (register_pernet_subsys(&net_inuse_ops))
2580 panic("Cannot initialize net inuse counters");
2581
2582 return 0;
2583}
2584
2585core_initcall(net_inuse_init);
2586#else
1338d466
PE		 2587static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2588
c29a0bc4 2589void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2590{
d6d9ca0f 2591 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2592}
2593EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2594
c29a0bc4 2595int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2596{
2597 int cpu, idx = prot->inuse_idx;
2598 int res = 0;
2599
2600 for_each_possible_cpu(cpu)
2601 res += per_cpu(prot_inuse, cpu).val[idx];
2602
2603 return res >= 0 ? res : 0;
2604}
2605EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2606#endif
13ff3d6f
PE		 2607
2608static void assign_proto_idx(struct proto *prot)
2609{
2610 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2611
2612 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2613 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2614 return;
2615 }
2616
2617 set_bit(prot->inuse_idx, proto_inuse_idx);
2618}
2619
2620static void release_proto_idx(struct proto *prot)
2621{
2622 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2623 clear_bit(prot->inuse_idx, proto_inuse_idx);
2624}
2625#else
2626static inline void assign_proto_idx(struct proto *prot)
2627{
2628}
2629
2630static inline void release_proto_idx(struct proto *prot)
2631{
2632}
2633#endif
2634
b733c007
PE		 2635int proto_register(struct proto *prot, int alloc_slab)
2636{
1da177e4
LT		 2637 if (alloc_slab) {
2638 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2639 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2640 NULL);
1da177e4
LT		 2641
2642 if (prot->slab == NULL) {
e005d193
JP		 2643 pr_crit("%s: Can't create sock SLAB cache!\n",
2644 prot->name);
60e7663d 2645 goto out;
1da177e4 2646 }
2e6599cb
ACM		 2647
2648 if (prot->rsk_prot != NULL) {
faf23422 2649 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2650 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2651 goto out_free_sock_slab;
2652
7e56b5d6 2653 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2654 prot->rsk_prot->obj_size, 0,
20c2df83 2655 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2656
2657 if (prot->rsk_prot->slab == NULL) {
e005d193
JP		 2658 pr_crit("%s: Can't create request sock SLAB cache!\n",
2659 prot->name);
2e6599cb
ACM		 2660 goto out_free_request_sock_slab_name;
2661 }
2662 }
8feaf0c0 2663
6d6ee43e 2664 if (prot->twsk_prot != NULL) {
faf23422 2665 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2666
7e56b5d6 2667 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2668 goto out_free_request_sock_slab;
2669
6d6ee43e 2670 prot->twsk_prot->twsk_slab =
7e56b5d6 2671 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2672 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2673 0,
2674 SLAB_HWCACHE_ALIGN |
2675 prot->slab_flags,
20c2df83 2676 NULL);
6d6ee43e 2677 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2678 goto out_free_timewait_sock_slab_name;
2679 }
1da177e4
LT		 2680 }
2681
36b77a52 2682 mutex_lock(&proto_list_mutex);
1da177e4 2683 list_add(&prot->node, &proto_list);
13ff3d6f 2684 assign_proto_idx(prot);
36b77a52 2685 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2686 return 0;
2687
8feaf0c0 2688out_free_timewait_sock_slab_name:
7e56b5d6 2689 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2690out_free_request_sock_slab:
2691 if (prot->rsk_prot && prot->rsk_prot->slab) {
2692 kmem_cache_destroy(prot->rsk_prot->slab);
2693 prot->rsk_prot->slab = NULL;
2694 }
2e6599cb 2695out_free_request_sock_slab_name:
72150e9b
DC		 2696 if (prot->rsk_prot)
2697 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2698out_free_sock_slab:
2699 kmem_cache_destroy(prot->slab);
2700 prot->slab = NULL;
b733c007
PE		 2701out:
2702 return -ENOBUFS;
1da177e4 2703}
1da177e4
LT		 2704EXPORT_SYMBOL(proto_register);
2705
2706void proto_unregister(struct proto *prot)
2707{
36b77a52 2708 mutex_lock(&proto_list_mutex);
13ff3d6f 2709 release_proto_idx(prot);
0a3f4358 2710 list_del(&prot->node);
36b77a52 2711 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2712
2713 if (prot->slab != NULL) {
2714 kmem_cache_destroy(prot->slab);
2715 prot->slab = NULL;
2716 }
2717
2e6599cb 2718 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2719 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2720 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2721 prot->rsk_prot->slab = NULL;
2722 }
2723
6d6ee43e 2724 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2725 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2726 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2727 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2728 }
1da177e4 2729}
1da177e4
LT		 2730EXPORT_SYMBOL(proto_unregister);
2731
2732#ifdef CONFIG_PROC_FS
1da177e4 2733static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2734 __acquires(proto_list_mutex)
1da177e4 2735{
36b77a52 2736 mutex_lock(&proto_list_mutex);
60f0438a 2737 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2738}
2739
2740static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2741{
60f0438a 2742 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2743}
2744
2745static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2746 __releases(proto_list_mutex)
1da177e4 2747{
36b77a52 2748 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2749}
2750
2751static char proto_method_implemented(const void *method)
2752{
2753 return method == NULL ? 'n' : 'y';
2754}
180d8cd9
GC		 2755static long sock_prot_memory_allocated(struct proto *proto)
2756{
cb75a36c 2757 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2758}
2759
2760static char *sock_prot_memory_pressure(struct proto *proto)
2761{
2762 return proto->memory_pressure != NULL ?
2763 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2764}
1da177e4
LT		 2765
2766static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2767{
180d8cd9 2768
8d987e5c 2769 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2770 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2771 proto->name,
2772 proto->obj_size,
14e943db 2773 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2774 sock_prot_memory_allocated(proto),
2775 sock_prot_memory_pressure(proto),
1da177e4
LT		 2776 proto->max_header,
2777 proto->slab == NULL ? "no" : "yes",
2778 module_name(proto->owner),
2779 proto_method_implemented(proto->close),
2780 proto_method_implemented(proto->connect),
2781 proto_method_implemented(proto->disconnect),
2782 proto_method_implemented(proto->accept),
2783 proto_method_implemented(proto->ioctl),
2784 proto_method_implemented(proto->init),
2785 proto_method_implemented(proto->destroy),
2786 proto_method_implemented(proto->shutdown),
2787 proto_method_implemented(proto->setsockopt),
2788 proto_method_implemented(proto->getsockopt),
2789 proto_method_implemented(proto->sendmsg),
2790 proto_method_implemented(proto->recvmsg),
2791 proto_method_implemented(proto->sendpage),
2792 proto_method_implemented(proto->bind),
2793 proto_method_implemented(proto->backlog_rcv),
2794 proto_method_implemented(proto->hash),
2795 proto_method_implemented(proto->unhash),
2796 proto_method_implemented(proto->get_port),
2797 proto_method_implemented(proto->enter_memory_pressure));
2798}
2799
2800static int proto_seq_show(struct seq_file *seq, void *v)
2801{
60f0438a 2802 if (v == &proto_list)
1da177e4
LT		 2803 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2804 "protocol",
2805 "size",
2806 "sockets",
2807 "memory",
2808 "press",
2809 "maxhdr",
2810 "slab",
2811 "module",
2812 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2813 else
60f0438a 2814 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2815 return 0;
2816}
2817
f690808e 2818static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2819 .start = proto_seq_start,
2820 .next = proto_seq_next,
2821 .stop = proto_seq_stop,
2822 .show = proto_seq_show,
2823};
2824
2825static int proto_seq_open(struct inode *inode, struct file *file)
2826{
14e943db
ED		 2827 return seq_open_net(inode, file, &proto_seq_ops,
2828 sizeof(struct seq_net_private));
1da177e4
LT		 2829}
2830
9a32144e 2831static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2832 .owner = THIS_MODULE,
2833 .open = proto_seq_open,
2834 .read = seq_read,
2835 .llseek = seq_lseek,
14e943db
ED		 2836 .release = seq_release_net,
2837};
2838
2839static __net_init int proto_init_net(struct net *net)
2840{
d4beaa66 2841 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 2842 return -ENOMEM;
2843
2844 return 0;
2845}
2846
2847static __net_exit void proto_exit_net(struct net *net)
2848{
ece31ffd 2849 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 2850}
2851
2852
2853static __net_initdata struct pernet_operations proto_net_ops = {
2854 .init = proto_init_net,
2855 .exit = proto_exit_net,
1da177e4
LT		 2856};
2857
2858static int __init proto_init(void)
2859{
14e943db 2860 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2861}
2862
2863subsys_initcall(proto_init);
2864
2865#endif /* PROC_FS */
Linux kernel - Deliverables
This page took 0.96465 seconds and 5 git commands to generate.