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Merge tag 'fbdev-fixes-3.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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, <[email protected]>
12 * Florian La Roche, <[email protected]>
13 * Alan Cox, <[email protected]>
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
076bb0c8 142#include <net/busy_poll.h>
06021292 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);
c91f6df2 576 char devname[IFNAMSIZ];
c91f6df2
BH		 577
578 if (sk->sk_bound_dev_if == 0) {
579 len = 0;
580 goto zero;
581 }
582
583 ret = -EINVAL;
584 if (len < IFNAMSIZ)
585 goto out;
586
5dbe7c17
NS		 587 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
588 if (ret)
c91f6df2 589 goto out;
c91f6df2
BH		 590
591 len = strlen(devname) + 1;
592
593 ret = -EFAULT;
594 if (copy_to_user(optval, devname, len))
595 goto out;
596
597zero:
598 ret = -EFAULT;
599 if (put_user(len, optlen))
600 goto out;
601
602 ret = 0;
603
604out:
605#endif
606
607 return ret;
608}
609
c0ef877b
PE		 610static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
611{
612 if (valbool)
613 sock_set_flag(sk, bit);
614 else
615 sock_reset_flag(sk, bit);
616}
617
1da177e4
LT		 618/*
619 * This is meant for all protocols to use and covers goings on
620 * at the socket level. Everything here is generic.
621 */
622
623int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 624 char __user *optval, unsigned int optlen)
1da177e4 625{
2a91525c 626 struct sock *sk = sock->sk;
1da177e4
LT		 627 int val;
628 int valbool;
629 struct linger ling;
630 int ret = 0;
4ec93edb 631
1da177e4
LT		 632 /*
633 * Options without arguments
634 */
635
4878809f 636 if (optname == SO_BINDTODEVICE)
c91f6df2 637 return sock_setbindtodevice(sk, optval, optlen);
4878809f 638
e71a4783
SH		 639 if (optlen < sizeof(int))
640 return -EINVAL;
4ec93edb 641
1da177e4
LT		 642 if (get_user(val, (int __user *)optval))
643 return -EFAULT;
4ec93edb 644
2a91525c 645 valbool = val ? 1 : 0;
1da177e4
LT		 646
647 lock_sock(sk);
648
2a91525c 649 switch (optname) {
e71a4783 650 case SO_DEBUG:
2a91525c 651 if (val && !capable(CAP_NET_ADMIN))
e71a4783 652 ret = -EACCES;
2a91525c 653 else
c0ef877b 654 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 655 break;
656 case SO_REUSEADDR:
4a17fd52 657 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 658 break;
055dc21a
TH		 659 case SO_REUSEPORT:
660 sk->sk_reuseport = valbool;
661 break;
e71a4783 662 case SO_TYPE:
49c794e9 663 case SO_PROTOCOL:
0d6038ee 664 case SO_DOMAIN:
e71a4783
SH		 665 case SO_ERROR:
666 ret = -ENOPROTOOPT;
667 break;
668 case SO_DONTROUTE:
c0ef877b 669 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 670 break;
671 case SO_BROADCAST:
672 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
673 break;
674 case SO_SNDBUF:
675 /* Don't error on this BSD doesn't and if you think
82981930
ED		 676 * about it this is right. Otherwise apps have to
677 * play 'guess the biggest size' games. RCVBUF/SNDBUF
678 * are treated in BSD as hints
679 */
680 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 681set_sndbuf:
e71a4783 682 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 683 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
684 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 685 sk->sk_write_space(sk);
686 break;
1da177e4 687
e71a4783
SH		 688 case SO_SNDBUFFORCE:
689 if (!capable(CAP_NET_ADMIN)) {
690 ret = -EPERM;
691 break;
692 }
693 goto set_sndbuf;
b0573dea 694
e71a4783
SH		 695 case SO_RCVBUF:
696 /* Don't error on this BSD doesn't and if you think
82981930
ED		 697 * about it this is right. Otherwise apps have to
698 * play 'guess the biggest size' games. RCVBUF/SNDBUF
699 * are treated in BSD as hints
700 */
701 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 702set_rcvbuf:
e71a4783
SH		 703 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
704 /*
705 * We double it on the way in to account for
706 * "struct sk_buff" etc. overhead. Applications
707 * assume that the SO_RCVBUF setting they make will
708 * allow that much actual data to be received on that
709 * socket.
710 *
711 * Applications are unaware that "struct sk_buff" and
712 * other overheads allocate from the receive buffer
713 * during socket buffer allocation.
714 *
715 * And after considering the possible alternatives,
716 * returning the value we actually used in getsockopt
717 * is the most desirable behavior.
718 */
82981930 719 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 720 break;
721
722 case SO_RCVBUFFORCE:
723 if (!capable(CAP_NET_ADMIN)) {
724 ret = -EPERM;
1da177e4 725 break;
e71a4783
SH		 726 }
727 goto set_rcvbuf;
1da177e4 728
e71a4783 729 case SO_KEEPALIVE:
1da177e4 730#ifdef CONFIG_INET
3e10986d
ED		 731 if (sk->sk_protocol == IPPROTO_TCP &&
732 sk->sk_type == SOCK_STREAM)
e71a4783 733 tcp_set_keepalive(sk, valbool);
1da177e4 734#endif
e71a4783
SH		 735 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
736 break;
737
738 case SO_OOBINLINE:
739 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
740 break;
741
742 case SO_NO_CHECK:
743 sk->sk_no_check = valbool;
744 break;
745
746 case SO_PRIORITY:
5e1fccc0
EB		 747 if ((val >= 0 && val <= 6) ||
748 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 749 sk->sk_priority = val;
750 else
751 ret = -EPERM;
752 break;
753
754 case SO_LINGER:
755 if (optlen < sizeof(ling)) {
756 ret = -EINVAL; /* 1003.1g */
1da177e4 757 break;
e71a4783 758 }
2a91525c 759 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 760 ret = -EFAULT;
1da177e4 761 break;
e71a4783
SH		 762 }
763 if (!ling.l_onoff)
764 sock_reset_flag(sk, SOCK_LINGER);
765 else {
1da177e4 766#if (BITS_PER_LONG == 32)
e71a4783
SH		 767 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
768 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 769 else
e71a4783
SH		 770#endif
771 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
772 sock_set_flag(sk, SOCK_LINGER);
773 }
774 break;
775
776 case SO_BSDCOMPAT:
777 sock_warn_obsolete_bsdism("setsockopt");
778 break;
779
780 case SO_PASSCRED:
781 if (valbool)
782 set_bit(SOCK_PASSCRED, &sock->flags);
783 else
784 clear_bit(SOCK_PASSCRED, &sock->flags);
785 break;
786
787 case SO_TIMESTAMP:
92f37fd2 788 case SO_TIMESTAMPNS:
e71a4783 789 if (valbool) {
92f37fd2
ED		 790 if (optname == SO_TIMESTAMP)
791 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
792 else
793 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 794 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 795 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 796 } else {
e71a4783 797 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 798 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
799 }
e71a4783
SH		 800 break;
801
20d49473
PO		 802 case SO_TIMESTAMPING:
803 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 804 ret = -EINVAL;
20d49473
PO		 805 break;
806 }
807 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
808 val & SOF_TIMESTAMPING_TX_HARDWARE);
809 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
810 val & SOF_TIMESTAMPING_TX_SOFTWARE);
811 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
812 val & SOF_TIMESTAMPING_RX_HARDWARE);
813 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
814 sock_enable_timestamp(sk,
815 SOCK_TIMESTAMPING_RX_SOFTWARE);
816 else
817 sock_disable_timestamp(sk,
08e29af3 818 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 819 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
820 val & SOF_TIMESTAMPING_SOFTWARE);
821 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
822 val & SOF_TIMESTAMPING_SYS_HARDWARE);
823 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
824 val & SOF_TIMESTAMPING_RAW_HARDWARE);
825 break;
826
e71a4783
SH		 827 case SO_RCVLOWAT:
828 if (val < 0)
829 val = INT_MAX;
830 sk->sk_rcvlowat = val ? : 1;
831 break;
832
833 case SO_RCVTIMEO:
834 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
835 break;
836
837 case SO_SNDTIMEO:
838 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
839 break;
1da177e4 840
e71a4783
SH		 841 case SO_ATTACH_FILTER:
842 ret = -EINVAL;
843 if (optlen == sizeof(struct sock_fprog)) {
844 struct sock_fprog fprog;
1da177e4 845
e71a4783
SH		 846 ret = -EFAULT;
847 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 848 break;
e71a4783
SH		 849
850 ret = sk_attach_filter(&fprog, sk);
851 }
852 break;
853
854 case SO_DETACH_FILTER:
55b33325 855 ret = sk_detach_filter(sk);
e71a4783 856 break;
1da177e4 857
d59577b6
VB		 858 case SO_LOCK_FILTER:
859 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
860 ret = -EPERM;
861 else
862 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
863 break;
864
e71a4783
SH		 865 case SO_PASSSEC:
866 if (valbool)
867 set_bit(SOCK_PASSSEC, &sock->flags);
868 else
869 clear_bit(SOCK_PASSSEC, &sock->flags);
870 break;
4a19ec58 871 case SO_MARK:
5e1fccc0 872 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 873 ret = -EPERM;
2a91525c 874 else
4a19ec58 875 sk->sk_mark = val;
4a19ec58 876 break;
877ce7c1 877
1da177e4
LT		 878 /* We implement the SO_SNDLOWAT etc to
879 not be settable (1003.1g 5.3) */
3b885787 880 case SO_RXQ_OVFL:
8083f0fc 881 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 882 break;
6e3e939f
JB		 883
884 case SO_WIFI_STATUS:
885 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
886 break;
887
ef64a54f
PE		 888 case SO_PEEK_OFF:
889 if (sock->ops->set_peek_off)
890 sock->ops->set_peek_off(sk, val);
891 else
892 ret = -EOPNOTSUPP;
893 break;
3bdc0eba
BG		 894
895 case SO_NOFCS:
896 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
897 break;
898
7d4c04fc
KJ		 899 case SO_SELECT_ERR_QUEUE:
900 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
901 break;
902
dafcc438 903#ifdef CONFIG_NET_LL_RX_POLL
64b0dc51 904 case SO_BUSY_POLL:
dafcc438
ET		 905 /* allow unprivileged users to decrease the value */
906 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
907 ret = -EPERM;
908 else {
909 if (val < 0)
910 ret = -EINVAL;
911 else
912 sk->sk_ll_usec = val;
913 }
914 break;
915#endif
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
dafcc438 1173#ifdef CONFIG_NET_LL_RX_POLL
64b0dc51 1174 case SO_BUSY_POLL:
dafcc438
ET		 1175 v.val = sk->sk_ll_usec;
1176 break;
1177#endif
1178
e71a4783
SH		 1179 default:
1180 return -ENOPROTOOPT;
1da177e4 1181 }
e71a4783 1182
1da177e4
LT		 1183 if (len > lv)
1184 len = lv;
1185 if (copy_to_user(optval, &v, len))
1186 return -EFAULT;
1187lenout:
4ec93edb
YH		 1188 if (put_user(len, optlen))
1189 return -EFAULT;
1190 return 0;
1da177e4
LT		 1191}
1192
a5b5bb9a
IM		 1193/*
1194 * Initialize an sk_lock.
1195 *
1196 * (We also register the sk_lock with the lock validator.)
1197 */
b6f99a21 1198static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1199{
ed07536e
PZ		 1200 sock_lock_init_class_and_name(sk,
1201 af_family_slock_key_strings[sk->sk_family],
1202 af_family_slock_keys + sk->sk_family,
1203 af_family_key_strings[sk->sk_family],
1204 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1205}
1206
4dc6dc71
ED		 1207/*
1208 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1209 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1210 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1211 */
f1a6c4da
PE		 1212static void sock_copy(struct sock *nsk, const struct sock *osk)
1213{
1214#ifdef CONFIG_SECURITY_NETWORK
1215 void *sptr = nsk->sk_security;
1216#endif
68835aba
ED		 1217 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1218
1219 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1220 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1221
f1a6c4da
PE		 1222#ifdef CONFIG_SECURITY_NETWORK
1223 nsk->sk_security = sptr;
1224 security_sk_clone(osk, nsk);
1225#endif
1226}
1227
fcbdf09d
OP		 1228void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1229{
1230 unsigned long nulls1, nulls2;
1231
1232 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1233 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1234 if (nulls1 > nulls2)
1235 swap(nulls1, nulls2);
1236
1237 if (nulls1 != 0)
1238 memset((char *)sk, 0, nulls1);
1239 memset((char *)sk + nulls1 + sizeof(void *), 0,
1240 nulls2 - nulls1 - sizeof(void *));
1241 memset((char *)sk + nulls2 + sizeof(void *), 0,
1242 size - nulls2 - sizeof(void *));
1243}
1244EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1245
2e4afe7b
PE		 1246static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1247 int family)
c308c1b2
PE		 1248{
1249 struct sock *sk;
1250 struct kmem_cache *slab;
1251
1252 slab = prot->slab;
e912b114
ED		 1253 if (slab != NULL) {
1254 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1255 if (!sk)
1256 return sk;
1257 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1258 if (prot->clear_sk)
1259 prot->clear_sk(sk, prot->obj_size);
1260 else
1261 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1262 }
fcbdf09d 1263 } else
c308c1b2
PE		 1264 sk = kmalloc(prot->obj_size, priority);
1265
2e4afe7b 1266 if (sk != NULL) {
a98b65a3
VN		 1267 kmemcheck_annotate_bitfield(sk, flags);
1268
2e4afe7b
PE		 1269 if (security_sk_alloc(sk, family, priority))
1270 goto out_free;
1271
1272 if (!try_module_get(prot->owner))
1273 goto out_free_sec;
e022f0b4 1274 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1275 }
1276
c308c1b2 1277 return sk;
2e4afe7b
PE		 1278
1279out_free_sec:
1280 security_sk_free(sk);
1281out_free:
1282 if (slab != NULL)
1283 kmem_cache_free(slab, sk);
1284 else
1285 kfree(sk);
1286 return NULL;
c308c1b2
PE		 1287}
1288
1289static void sk_prot_free(struct proto *prot, struct sock *sk)
1290{
1291 struct kmem_cache *slab;
2e4afe7b 1292 struct module *owner;
c308c1b2 1293
2e4afe7b 1294 owner = prot->owner;
c308c1b2 1295 slab = prot->slab;
2e4afe7b
PE		 1296
1297 security_sk_free(sk);
c308c1b2
PE		 1298 if (slab != NULL)
1299 kmem_cache_free(slab, sk);
1300 else
1301 kfree(sk);
2e4afe7b 1302 module_put(owner);
c308c1b2
PE		 1303}
1304
8fb974c9 1305#if IS_ENABLED(CONFIG_NET_CLS_CGROUP)
211d2f97 1306void sock_update_classid(struct sock *sk)
f8451725 1307{
1144182a 1308 u32 classid;
f8451725 1309
211d2f97 1310 classid = task_cls_classid(current);
3afa6d00 1311 if (classid != sk->sk_classid)
f8451725
HX		 1312 sk->sk_classid = classid;
1313}
82862742 1314EXPORT_SYMBOL(sock_update_classid);
8fb974c9 1315#endif
5bc1421e 1316
51e4e7fa 1317#if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
6ffd4641 1318void sock_update_netprioidx(struct sock *sk)
5bc1421e 1319{
5bc1421e
NH		 1320 if (in_interrupt())
1321 return;
2b73bc65 1322
6ffd4641 1323 sk->sk_cgrp_prioidx = task_netprioidx(current);
5bc1421e
NH		 1324}
1325EXPORT_SYMBOL_GPL(sock_update_netprioidx);
f8451725
HX		 1326#endif
1327
1da177e4
LT		 1328/**
1329 * sk_alloc - All socket objects are allocated here
c4ea43c5 1330 * @net: the applicable net namespace
4dc3b16b
PP		 1331 * @family: protocol family
1332 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1333 * @prot: struct proto associated with this new sock instance
1da177e4 1334 */
1b8d7ae4 1335struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1336 struct proto *prot)
1da177e4 1337{
c308c1b2 1338 struct sock *sk;
1da177e4 1339
154adbc8 1340 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1341 if (sk) {
154adbc8
PE		 1342 sk->sk_family = family;
1343 /*
1344 * See comment in struct sock definition to understand
1345 * why we need sk_prot_creator -acme
1346 */
1347 sk->sk_prot = sk->sk_prot_creator = prot;
1348 sock_lock_init(sk);
3b1e0a65 1349 sock_net_set(sk, get_net(net));
d66ee058 1350 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1351
211d2f97 1352 sock_update_classid(sk);
6ffd4641 1353 sock_update_netprioidx(sk);
1da177e4 1354 }
a79af59e 1355
2e4afe7b 1356 return sk;
1da177e4 1357}
2a91525c 1358EXPORT_SYMBOL(sk_alloc);
1da177e4 1359
2b85a34e 1360static void __sk_free(struct sock *sk)
1da177e4
LT		 1361{
1362 struct sk_filter *filter;
1da177e4
LT		 1363
1364 if (sk->sk_destruct)
1365 sk->sk_destruct(sk);
1366
a898def2
PM		 1367 filter = rcu_dereference_check(sk->sk_filter,
1368 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1369 if (filter) {
309dd5fc 1370 sk_filter_uncharge(sk, filter);
a9b3cd7f 1371 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1372 }
1373
08e29af3 1374 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1375
1376 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1377 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1378 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1379
109f6e39
EB		 1380 if (sk->sk_peer_cred)
1381 put_cred(sk->sk_peer_cred);
1382 put_pid(sk->sk_peer_pid);
3b1e0a65 1383 put_net(sock_net(sk));
c308c1b2 1384 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1385}
2b85a34e
ED		 1386
1387void sk_free(struct sock *sk)
1388{
1389 /*
25985edc 1390 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1391 * some packets are still in some tx queue.
1392 * If not null, sock_wfree() will call __sk_free(sk) later
1393 */
1394 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1395 __sk_free(sk);
1396}
2a91525c 1397EXPORT_SYMBOL(sk_free);
1da177e4 1398
edf02087 1399/*
25985edc
LDM		 1400 * Last sock_put should drop reference to sk->sk_net. It has already
1401 * been dropped in sk_change_net. Taking reference to stopping namespace
edf02087 1402 * is not an option.
25985edc 1403 * Take reference to a socket to remove it from hash _alive_ and after that
edf02087
DL		 1404 * destroy it in the context of init_net.
1405 */
1406void sk_release_kernel(struct sock *sk)
1407{
1408 if (sk == NULL || sk->sk_socket == NULL)
1409 return;
1410
1411 sock_hold(sk);
1412 sock_release(sk->sk_socket);
65a18ec5 1413 release_net(sock_net(sk));
3b1e0a65 1414 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1415 sock_put(sk);
1416}
45af1754 1417EXPORT_SYMBOL(sk_release_kernel);
edf02087 1418
475f1b52
SR		 1419static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1420{
1421 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1422 sock_update_memcg(newsk);
1423}
1424
e56c57d0
ED		 1425/**
1426 * sk_clone_lock - clone a socket, and lock its clone
1427 * @sk: the socket to clone
1428 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1429 *
1430 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1431 */
1432struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1433{
8fd1d178 1434 struct sock *newsk;
87d11ceb 1435
8fd1d178 1436 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1437 if (newsk != NULL) {
1438 struct sk_filter *filter;
1439
892c141e 1440 sock_copy(newsk, sk);
87d11ceb
ACM		 1441
1442 /* SANITY */
3b1e0a65 1443 get_net(sock_net(newsk));
87d11ceb
ACM		 1444 sk_node_init(&newsk->sk_node);
1445 sock_lock_init(newsk);
1446 bh_lock_sock(newsk);
fa438ccf 1447 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1448 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1449
1450 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1451 /*
1452 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1453 */
1454 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1455 atomic_set(&newsk->sk_omem_alloc, 0);
1456 skb_queue_head_init(&newsk->sk_receive_queue);
1457 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1458#ifdef CONFIG_NET_DMA
1459 skb_queue_head_init(&newsk->sk_async_wait_queue);
1460#endif
87d11ceb 1461
b6c6712a 1462 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1463 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1464 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1465 af_callback_keys + newsk->sk_family,
1466 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1467
1468 newsk->sk_dst_cache = NULL;
1469 newsk->sk_wmem_queued = 0;
1470 newsk->sk_forward_alloc = 0;
1471 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1472 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1473
1474 sock_reset_flag(newsk, SOCK_DONE);
1475 skb_queue_head_init(&newsk->sk_error_queue);
1476
0d7da9dd 1477 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb
ACM		 1478 if (filter != NULL)
1479 sk_filter_charge(newsk, filter);
1480
1481 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1482 /* It is still raw copy of parent, so invalidate
1483 * destructor and make plain sk_free() */
1484 newsk->sk_destruct = NULL;
b0691c8e 1485 bh_unlock_sock(newsk);
87d11ceb
ACM		 1486 sk_free(newsk);
1487 newsk = NULL;
1488 goto out;
1489 }
1490
1491 newsk->sk_err = 0;
1492 newsk->sk_priority = 0;
4dc6dc71
ED		 1493 /*
1494 * Before updating sk_refcnt, we must commit prior changes to memory
1495 * (Documentation/RCU/rculist_nulls.txt for details)
1496 */
1497 smp_wmb();
87d11ceb
ACM		 1498 atomic_set(&newsk->sk_refcnt, 2);
1499
1500 /*
1501 * Increment the counter in the same struct proto as the master
1502 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1503 * is the same as sk->sk_prot->socks, as this field was copied
1504 * with memcpy).
1505 *
1506 * This _changes_ the previous behaviour, where
1507 * tcp_create_openreq_child always was incrementing the
1508 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1509 * to be taken into account in all callers. -acme
1510 */
1511 sk_refcnt_debug_inc(newsk);
972692e0 1512 sk_set_socket(newsk, NULL);
43815482 1513 newsk->sk_wq = NULL;
87d11ceb 1514
f3f511e1
GC		 1515 sk_update_clone(sk, newsk);
1516
87d11ceb 1517 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1518 sk_sockets_allocated_inc(newsk);
704da560 1519
08e29af3 1520 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1521 net_enable_timestamp();
87d11ceb
ACM		 1522 }
1523out:
1524 return newsk;
1525}
e56c57d0 1526EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1527
9958089a
AK		 1528void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1529{
1530 __sk_dst_set(sk, dst);
1531 sk->sk_route_caps = dst->dev->features;
1532 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1533 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1534 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1535 if (sk_can_gso(sk)) {
82cc1a7a 1536 if (dst->header_len) {
9958089a 1537 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1538 } else {
9958089a 1539 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1540 sk->sk_gso_max_size = dst->dev->gso_max_size;
1485348d 1541 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
82cc1a7a 1542 }
9958089a
AK		 1543 }
1544}
1545EXPORT_SYMBOL_GPL(sk_setup_caps);
1546
1da177e4
LT		 1547/*
1548 * Simple resource managers for sockets.
1549 */
1550
1551
4ec93edb
YH		 1552/*
1553 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1554 */
1555void sock_wfree(struct sk_buff *skb)
1556{
1557 struct sock *sk = skb->sk;
d99927f4 1558 unsigned int len = skb->truesize;
1da177e4 1559
d99927f4
ED		 1560 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1561 /*
1562 * Keep a reference on sk_wmem_alloc, this will be released
1563 * after sk_write_space() call
1564 */
1565 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1566 sk->sk_write_space(sk);
d99927f4
ED		 1567 len = 1;
1568 }
2b85a34e 1569 /*
d99927f4
ED		 1570 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1571 * could not do because of in-flight packets
2b85a34e 1572 */
d99927f4 1573 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1574 __sk_free(sk);
1da177e4 1575}
2a91525c 1576EXPORT_SYMBOL(sock_wfree);
1da177e4 1577
4ec93edb
YH		 1578/*
1579 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1580 */
1581void sock_rfree(struct sk_buff *skb)
1582{
1583 struct sock *sk = skb->sk;
d361fd59 1584 unsigned int len = skb->truesize;
1da177e4 1585
d361fd59
ED		 1586 atomic_sub(len, &sk->sk_rmem_alloc);
1587 sk_mem_uncharge(sk, len);
1da177e4 1588}
2a91525c 1589EXPORT_SYMBOL(sock_rfree);
1da177e4 1590
41063e9d
DM		 1591void sock_edemux(struct sk_buff *skb)
1592{
e812347c
ED		 1593 struct sock *sk = skb->sk;
1594
1c463e57 1595#ifdef CONFIG_INET
e812347c
ED		 1596 if (sk->sk_state == TCP_TIME_WAIT)
1597 inet_twsk_put(inet_twsk(sk));
1598 else
1c463e57 1599#endif
e812347c 1600 sock_put(sk);
41063e9d
DM		 1601}
1602EXPORT_SYMBOL(sock_edemux);
1da177e4 1603
976d0201 1604kuid_t sock_i_uid(struct sock *sk)
1da177e4 1605{
976d0201 1606 kuid_t uid;
1da177e4 1607
f064af1e 1608 read_lock_bh(&sk->sk_callback_lock);
976d0201 1609 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1610 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1611 return uid;
1612}
2a91525c 1613EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1614
1615unsigned long sock_i_ino(struct sock *sk)
1616{
1617 unsigned long ino;
1618
f064af1e 1619 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1620 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1621 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1622 return ino;
1623}
2a91525c 1624EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1625
1626/*
1627 * Allocate a skb from the socket's send buffer.
1628 */
86a76caf 1629struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1630 gfp_t priority)
1da177e4
LT		 1631{
1632 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1633 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1634 if (skb) {
1635 skb_set_owner_w(skb, sk);
1636 return skb;
1637 }
1638 }
1639 return NULL;
1640}
2a91525c 1641EXPORT_SYMBOL(sock_wmalloc);
1da177e4
LT		 1642
1643/*
1644 * Allocate a skb from the socket's receive buffer.
4ec93edb 1645 */
86a76caf 1646struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1647 gfp_t priority)
1da177e4
LT		 1648{
1649 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1650 struct sk_buff *skb = alloc_skb(size, priority);
1651 if (skb) {
1652 skb_set_owner_r(skb, sk);
1653 return skb;
1654 }
1655 }
1656 return NULL;
1657}
1658
4ec93edb 1659/*
1da177e4 1660 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1661 */
dd0fc66f 1662void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1663{
95c96174 1664 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1665 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1666 void *mem;
1667 /* First do the add, to avoid the race if kmalloc
4ec93edb 1668 * might sleep.
1da177e4
LT		 1669 */
1670 atomic_add(size, &sk->sk_omem_alloc);
1671 mem = kmalloc(size, priority);
1672 if (mem)
1673 return mem;
1674 atomic_sub(size, &sk->sk_omem_alloc);
1675 }
1676 return NULL;
1677}
2a91525c 1678EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1679
1680/*
1681 * Free an option memory block.
1682 */
1683void sock_kfree_s(struct sock *sk, void *mem, int size)
1684{
1685 kfree(mem);
1686 atomic_sub(size, &sk->sk_omem_alloc);
1687}
2a91525c 1688EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1689
1690/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1691 I think, these locks should be removed for datagram sockets.
1692 */
2a91525c 1693static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1694{
1695 DEFINE_WAIT(wait);
1696
1697 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1698 for (;;) {
1699 if (!timeo)
1700 break;
1701 if (signal_pending(current))
1702 break;
1703 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1704 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1705 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1706 break;
1707 if (sk->sk_shutdown & SEND_SHUTDOWN)
1708 break;
1709 if (sk->sk_err)
1710 break;
1711 timeo = schedule_timeout(timeo);
1712 }
aa395145 1713 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1714 return timeo;
1715}
1716
1717
1718/*
1719 * Generic send/receive buffer handlers
1720 */
1721
4cc7f68d
HX		 1722struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1723 unsigned long data_len, int noblock,
1724 int *errcode)
1da177e4
LT		 1725{
1726 struct sk_buff *skb;
7d877f3b 1727 gfp_t gfp_mask;
1da177e4
LT		 1728 long timeo;
1729 int err;
cc9b17ad
JW		 1730 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1731
1732 err = -EMSGSIZE;
1733 if (npages > MAX_SKB_FRAGS)
1734 goto failure;
1da177e4
LT		 1735
1736 gfp_mask = sk->sk_allocation;
1737 if (gfp_mask & __GFP_WAIT)
1738 gfp_mask |= __GFP_REPEAT;
1739
1740 timeo = sock_sndtimeo(sk, noblock);
1741 while (1) {
1742 err = sock_error(sk);
1743 if (err != 0)
1744 goto failure;
1745
1746 err = -EPIPE;
1747 if (sk->sk_shutdown & SEND_SHUTDOWN)
1748 goto failure;
1749
1750 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1751 skb = alloc_skb(header_len, gfp_mask);
1da177e4 1752 if (skb) {
1da177e4
LT		 1753 int i;
1754
1755 /* No pages, we're done... */
1756 if (!data_len)
1757 break;
1758
1da177e4
LT		 1759 skb->truesize += data_len;
1760 skb_shinfo(skb)->nr_frags = npages;
1761 for (i = 0; i < npages; i++) {
1762 struct page *page;
1da177e4
LT		 1763
1764 page = alloc_pages(sk->sk_allocation, 0);
1765 if (!page) {
1766 err = -ENOBUFS;
1767 skb_shinfo(skb)->nr_frags = i;
1768 kfree_skb(skb);
1769 goto failure;
1770 }
1771
ea2ab693
IC		 1772 __skb_fill_page_desc(skb, i,
1773 page, 0,
1774 (data_len >= PAGE_SIZE ?
1775 PAGE_SIZE :
1776 data_len));
1da177e4
LT		 1777 data_len -= PAGE_SIZE;
1778 }
1779
1780 /* Full success... */
1781 break;
1782 }
1783 err = -ENOBUFS;
1784 goto failure;
1785 }
1786 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1787 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1788 err = -EAGAIN;
1789 if (!timeo)
1790 goto failure;
1791 if (signal_pending(current))
1792 goto interrupted;
1793 timeo = sock_wait_for_wmem(sk, timeo);
1794 }
1795
1796 skb_set_owner_w(skb, sk);
1797 return skb;
1798
1799interrupted:
1800 err = sock_intr_errno(timeo);
1801failure:
1802 *errcode = err;
1803 return NULL;
1804}
4cc7f68d 1805EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1806
4ec93edb 1807struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1808 int noblock, int *errcode)
1809{
1810 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1811}
2a91525c 1812EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1813
5640f768
ED		 1814/* On 32bit arches, an skb frag is limited to 2^15 */
1815#define SKB_FRAG_PAGE_ORDER get_order(32768)
1816
1817bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1818{
1819 int order;
1820
1821 if (pfrag->page) {
1822 if (atomic_read(&pfrag->page->_count) == 1) {
1823 pfrag->offset = 0;
1824 return true;
1825 }
1826 if (pfrag->offset < pfrag->size)
1827 return true;
1828 put_page(pfrag->page);
1829 }
1830
1831 /* We restrict high order allocations to users that can afford to wait */
1832 order = (sk->sk_allocation & __GFP_WAIT) ? SKB_FRAG_PAGE_ORDER : 0;
1833
1834 do {
1835 gfp_t gfp = sk->sk_allocation;
1836
1837 if (order)
1838 gfp |= __GFP_COMP | __GFP_NOWARN;
1839 pfrag->page = alloc_pages(gfp, order);
1840 if (likely(pfrag->page)) {
1841 pfrag->offset = 0;
1842 pfrag->size = PAGE_SIZE << order;
1843 return true;
1844 }
1845 } while (--order >= 0);
1846
1847 sk_enter_memory_pressure(sk);
1848 sk_stream_moderate_sndbuf(sk);
1849 return false;
1850}
1851EXPORT_SYMBOL(sk_page_frag_refill);
1852
1da177e4 1853static void __lock_sock(struct sock *sk)
f39234d6
NK		 1854 __releases(&sk->sk_lock.slock)
1855 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1856{
1857 DEFINE_WAIT(wait);
1858
e71a4783 1859 for (;;) {
1da177e4
LT		 1860 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1861 TASK_UNINTERRUPTIBLE);
1862 spin_unlock_bh(&sk->sk_lock.slock);
1863 schedule();
1864 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1865 if (!sock_owned_by_user(sk))
1da177e4
LT		 1866 break;
1867 }
1868 finish_wait(&sk->sk_lock.wq, &wait);
1869}
1870
1871static void __release_sock(struct sock *sk)
f39234d6
NK		 1872 __releases(&sk->sk_lock.slock)
1873 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1874{
1875 struct sk_buff *skb = sk->sk_backlog.head;
1876
1877 do {
1878 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1879 bh_unlock_sock(sk);
1880
1881 do {
1882 struct sk_buff *next = skb->next;
1883
e4cbb02a 1884 prefetch(next);
7fee226a 1885 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1886 skb->next = NULL;
c57943a1 1887 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1888
1889 /*
1890 * We are in process context here with softirqs
1891 * disabled, use cond_resched_softirq() to preempt.
1892 * This is safe to do because we've taken the backlog
1893 * queue private:
1894 */
1895 cond_resched_softirq();
1896
1897 skb = next;
1898 } while (skb != NULL);
1899
1900 bh_lock_sock(sk);
e71a4783 1901 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1902
1903 /*
1904 * Doing the zeroing here guarantee we can not loop forever
1905 * while a wild producer attempts to flood us.
1906 */
1907 sk->sk_backlog.len = 0;
1da177e4
LT		 1908}
1909
1910/**
1911 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1912 * @sk: sock to wait on
1913 * @timeo: for how long
1da177e4
LT		 1914 *
1915 * Now socket state including sk->sk_err is changed only under lock,
1916 * hence we may omit checks after joining wait queue.
1917 * We check receive queue before schedule() only as optimization;
1918 * it is very likely that release_sock() added new data.
1919 */
1920int sk_wait_data(struct sock *sk, long *timeo)
1921{
1922 int rc;
1923 DEFINE_WAIT(wait);
1924
aa395145 1925 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1926 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1927 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1928 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1929 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1930 return rc;
1931}
1da177e4
LT		 1932EXPORT_SYMBOL(sk_wait_data);
1933
3ab224be
HA		 1934/**
1935 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1936 * @sk: socket
1937 * @size: memory size to allocate
1938 * @kind: allocation type
1939 *
1940 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1941 * rmem allocation. This function assumes that protocols which have
1942 * memory_pressure use sk_wmem_queued as write buffer accounting.
1943 */
1944int __sk_mem_schedule(struct sock *sk, int size, int kind)
1945{
1946 struct proto *prot = sk->sk_prot;
1947 int amt = sk_mem_pages(size);
8d987e5c 1948 long allocated;
e1aab161 1949 int parent_status = UNDER_LIMIT;
3ab224be
HA		 1950
1951 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 1952
e1aab161 1953 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 1954
1955 /* Under limit. */
e1aab161
GC		 1956 if (parent_status == UNDER_LIMIT &&
1957 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 1958 sk_leave_memory_pressure(sk);
3ab224be
HA		 1959 return 1;
1960 }
1961
e1aab161
GC		 1962 /* Under pressure. (we or our parents) */
1963 if ((parent_status > SOFT_LIMIT) ||
1964 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 1965 sk_enter_memory_pressure(sk);
3ab224be 1966
e1aab161
GC		 1967 /* Over hard limit (we or our parents) */
1968 if ((parent_status == OVER_LIMIT) ||
1969 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 1970 goto suppress_allocation;
1971
1972 /* guarantee minimum buffer size under pressure */
1973 if (kind == SK_MEM_RECV) {
1974 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1975 return 1;
180d8cd9 1976
3ab224be
HA		 1977 } else { /* SK_MEM_SEND */
1978 if (sk->sk_type == SOCK_STREAM) {
1979 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1980 return 1;
1981 } else if (atomic_read(&sk->sk_wmem_alloc) <
1982 prot->sysctl_wmem[0])
1983 return 1;
1984 }
1985
180d8cd9 1986 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 1987 int alloc;
1988
180d8cd9 1989 if (!sk_under_memory_pressure(sk))
1748376b 1990 return 1;
180d8cd9
GC		 1991 alloc = sk_sockets_allocated_read_positive(sk);
1992 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 1993 sk_mem_pages(sk->sk_wmem_queued +
1994 atomic_read(&sk->sk_rmem_alloc) +
1995 sk->sk_forward_alloc))
1996 return 1;
1997 }
1998
1999suppress_allocation:
2000
2001 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2002 sk_stream_moderate_sndbuf(sk);
2003
2004 /* Fail only if socket is _under_ its sndbuf.
2005 * In this case we cannot block, so that we have to fail.
2006 */
2007 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2008 return 1;
2009 }
2010
3847ce32
SM		 2011 trace_sock_exceed_buf_limit(sk, prot, allocated);
2012
3ab224be
HA		 2013 /* Alas. Undo changes. */
2014 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2015
0e90b31f 2016 sk_memory_allocated_sub(sk, amt);
180d8cd9 2017
3ab224be
HA		 2018 return 0;
2019}
3ab224be
HA		 2020EXPORT_SYMBOL(__sk_mem_schedule);
2021
2022/**
2023 * __sk_reclaim - reclaim memory_allocated
2024 * @sk: socket
2025 */
2026void __sk_mem_reclaim(struct sock *sk)
2027{
180d8cd9 2028 sk_memory_allocated_sub(sk,
0e90b31f 2029 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
3ab224be
HA		 2030 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
2031
180d8cd9
GC		 2032 if (sk_under_memory_pressure(sk) &&
2033 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2034 sk_leave_memory_pressure(sk);
3ab224be 2035}
3ab224be
HA		 2036EXPORT_SYMBOL(__sk_mem_reclaim);
2037
2038
1da177e4
LT		 2039/*
2040 * Set of default routines for initialising struct proto_ops when
2041 * the protocol does not support a particular function. In certain
2042 * cases where it makes no sense for a protocol to have a "do nothing"
2043 * function, some default processing is provided.
2044 */
2045
2046int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2047{
2048 return -EOPNOTSUPP;
2049}
2a91525c 2050EXPORT_SYMBOL(sock_no_bind);
1da177e4 2051
4ec93edb 2052int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2053 int len, int flags)
2054{
2055 return -EOPNOTSUPP;
2056}
2a91525c 2057EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2058
2059int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2060{
2061 return -EOPNOTSUPP;
2062}
2a91525c 2063EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2064
2065int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2066{
2067 return -EOPNOTSUPP;
2068}
2a91525c 2069EXPORT_SYMBOL(sock_no_accept);
1da177e4 2070
4ec93edb 2071int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2072 int *len, int peer)
2073{
2074 return -EOPNOTSUPP;
2075}
2a91525c 2076EXPORT_SYMBOL(sock_no_getname);
1da177e4 2077
2a91525c 2078unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2079{
2080 return 0;
2081}
2a91525c 2082EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2083
2084int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2085{
2086 return -EOPNOTSUPP;
2087}
2a91525c 2088EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2089
2090int sock_no_listen(struct socket *sock, int backlog)
2091{
2092 return -EOPNOTSUPP;
2093}
2a91525c 2094EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2095
2096int sock_no_shutdown(struct socket *sock, int how)
2097{
2098 return -EOPNOTSUPP;
2099}
2a91525c 2100EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2101
2102int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2103 char __user *optval, unsigned int optlen)
1da177e4
LT		 2104{
2105 return -EOPNOTSUPP;
2106}
2a91525c 2107EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2108
2109int sock_no_getsockopt(struct socket *sock, int level, int optname,
2110 char __user *optval, int __user *optlen)
2111{
2112 return -EOPNOTSUPP;
2113}
2a91525c 2114EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 2115
2116int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2117 size_t len)
2118{
2119 return -EOPNOTSUPP;
2120}
2a91525c 2121EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 2122
2123int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2124 size_t len, int flags)
2125{
2126 return -EOPNOTSUPP;
2127}
2a91525c 2128EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2129
2130int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2131{
2132 /* Mirror missing mmap method error code */
2133 return -ENODEV;
2134}
2a91525c 2135EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2136
2137ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2138{
2139 ssize_t res;
2140 struct msghdr msg = {.msg_flags = flags};
2141 struct kvec iov;
2142 char *kaddr = kmap(page);
2143 iov.iov_base = kaddr + offset;
2144 iov.iov_len = size;
2145 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2146 kunmap(page);
2147 return res;
2148}
2a91525c 2149EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2150
2151/*
2152 * Default Socket Callbacks
2153 */
2154
2155static void sock_def_wakeup(struct sock *sk)
2156{
43815482
ED		 2157 struct socket_wq *wq;
2158
2159 rcu_read_lock();
2160 wq = rcu_dereference(sk->sk_wq);
2161 if (wq_has_sleeper(wq))
2162 wake_up_interruptible_all(&wq->wait);
2163 rcu_read_unlock();
1da177e4
LT		 2164}
2165
2166static void sock_def_error_report(struct sock *sk)
2167{
43815482
ED		 2168 struct socket_wq *wq;
2169
2170 rcu_read_lock();
2171 wq = rcu_dereference(sk->sk_wq);
2172 if (wq_has_sleeper(wq))
2173 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2174 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2175 rcu_read_unlock();
1da177e4
LT		 2176}
2177
2178static void sock_def_readable(struct sock *sk, int len)
2179{
43815482
ED		 2180 struct socket_wq *wq;
2181
2182 rcu_read_lock();
2183 wq = rcu_dereference(sk->sk_wq);
2184 if (wq_has_sleeper(wq))
2c6607c6 2185 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2186 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2187 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2188 rcu_read_unlock();
1da177e4
LT		 2189}
2190
2191static void sock_def_write_space(struct sock *sk)
2192{
43815482
ED		 2193 struct socket_wq *wq;
2194
2195 rcu_read_lock();
1da177e4
LT		 2196
2197 /* Do not wake up a writer until he can make "significant"
2198 * progress. --DaveM
2199 */
e71a4783 2200 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2201 wq = rcu_dereference(sk->sk_wq);
2202 if (wq_has_sleeper(wq))
2203 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2204 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2205
2206 /* Should agree with poll, otherwise some programs break */
2207 if (sock_writeable(sk))
8d8ad9d7 2208 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2209 }
2210
43815482 2211 rcu_read_unlock();
1da177e4
LT		 2212}
2213
2214static void sock_def_destruct(struct sock *sk)
2215{
a51482bd 2216 kfree(sk->sk_protinfo);
1da177e4
LT		 2217}
2218
2219void sk_send_sigurg(struct sock *sk)
2220{
2221 if (sk->sk_socket && sk->sk_socket->file)
2222 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2223 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2224}
2a91525c 2225EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2226
2227void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2228 unsigned long expires)
2229{
2230 if (!mod_timer(timer, expires))
2231 sock_hold(sk);
2232}
1da177e4
LT		 2233EXPORT_SYMBOL(sk_reset_timer);
2234
2235void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2236{
25cc4ae9 2237 if (del_timer(timer))
1da177e4
LT		 2238 __sock_put(sk);
2239}
1da177e4
LT		 2240EXPORT_SYMBOL(sk_stop_timer);
2241
2242void sock_init_data(struct socket *sock, struct sock *sk)
2243{
2244 skb_queue_head_init(&sk->sk_receive_queue);
2245 skb_queue_head_init(&sk->sk_write_queue);
2246 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 2247#ifdef CONFIG_NET_DMA
2248 skb_queue_head_init(&sk->sk_async_wait_queue);
2249#endif
1da177e4
LT		 2250
2251 sk->sk_send_head = NULL;
2252
2253 init_timer(&sk->sk_timer);
4ec93edb 2254
1da177e4
LT		 2255 sk->sk_allocation = GFP_KERNEL;
2256 sk->sk_rcvbuf = sysctl_rmem_default;
2257 sk->sk_sndbuf = sysctl_wmem_default;
2258 sk->sk_state = TCP_CLOSE;
972692e0 2259 sk_set_socket(sk, sock);
1da177e4
LT		 2260
2261 sock_set_flag(sk, SOCK_ZAPPED);
2262
e71a4783 2263 if (sock) {
1da177e4 2264 sk->sk_type = sock->type;
43815482 2265 sk->sk_wq = sock->wq;
1da177e4
LT		 2266 sock->sk = sk;
2267 } else
43815482 2268 sk->sk_wq = NULL;
1da177e4 2269
b6c6712a 2270 spin_lock_init(&sk->sk_dst_lock);
1da177e4 2271 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2272 lockdep_set_class_and_name(&sk->sk_callback_lock,
2273 af_callback_keys + sk->sk_family,
2274 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2275
2276 sk->sk_state_change = sock_def_wakeup;
2277 sk->sk_data_ready = sock_def_readable;
2278 sk->sk_write_space = sock_def_write_space;
2279 sk->sk_error_report = sock_def_error_report;
2280 sk->sk_destruct = sock_def_destruct;
2281
5640f768
ED		 2282 sk->sk_frag.page = NULL;
2283 sk->sk_frag.offset = 0;
ef64a54f 2284 sk->sk_peek_off = -1;
1da177e4 2285
109f6e39
EB		 2286 sk->sk_peer_pid = NULL;
2287 sk->sk_peer_cred = NULL;
1da177e4
LT		 2288 sk->sk_write_pending = 0;
2289 sk->sk_rcvlowat = 1;
2290 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2291 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2292
f37f0afb 2293 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2294
06021292
ET		 2295#ifdef CONFIG_NET_LL_RX_POLL
2296 sk->sk_napi_id = 0;
64b0dc51 2297 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2298#endif
2299
4dc6dc71
ED		 2300 /*
2301 * Before updating sk_refcnt, we must commit prior changes to memory
2302 * (Documentation/RCU/rculist_nulls.txt for details)
2303 */
2304 smp_wmb();
1da177e4 2305 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2306 atomic_set(&sk->sk_drops, 0);
1da177e4 2307}
2a91525c 2308EXPORT_SYMBOL(sock_init_data);
1da177e4 2309
b5606c2d 2310void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2311{
2312 might_sleep();
a5b5bb9a 2313 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2314 if (sk->sk_lock.owned)
1da177e4 2315 __lock_sock(sk);
d2e9117c 2316 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2317 spin_unlock(&sk->sk_lock.slock);
2318 /*
2319 * The sk_lock has mutex_lock() semantics here:
2320 */
fcc70d5f 2321 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2322 local_bh_enable();
1da177e4 2323}
fcc70d5f 2324EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2325
b5606c2d 2326void release_sock(struct sock *sk)
1da177e4 2327{
a5b5bb9a
IM		 2328 /*
2329 * The sk_lock has mutex_unlock() semantics:
2330 */
2331 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2332
2333 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2334 if (sk->sk_backlog.tail)
2335 __release_sock(sk);
46d3ceab
ED		 2336
2337 if (sk->sk_prot->release_cb)
2338 sk->sk_prot->release_cb(sk);
2339
d2e9117c 2340 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 2341 if (waitqueue_active(&sk->sk_lock.wq))
2342 wake_up(&sk->sk_lock.wq);
2343 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2344}
2345EXPORT_SYMBOL(release_sock);
2346
8a74ad60
ED		 2347/**
2348 * lock_sock_fast - fast version of lock_sock
2349 * @sk: socket
2350 *
2351 * This version should be used for very small section, where process wont block
2352 * return false if fast path is taken
2353 * sk_lock.slock locked, owned = 0, BH disabled
2354 * return true if slow path is taken
2355 * sk_lock.slock unlocked, owned = 1, BH enabled
2356 */
2357bool lock_sock_fast(struct sock *sk)
2358{
2359 might_sleep();
2360 spin_lock_bh(&sk->sk_lock.slock);
2361
2362 if (!sk->sk_lock.owned)
2363 /*
2364 * Note : We must disable BH
2365 */
2366 return false;
2367
2368 __lock_sock(sk);
2369 sk->sk_lock.owned = 1;
2370 spin_unlock(&sk->sk_lock.slock);
2371 /*
2372 * The sk_lock has mutex_lock() semantics here:
2373 */
2374 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2375 local_bh_enable();
2376 return true;
2377}
2378EXPORT_SYMBOL(lock_sock_fast);
2379
1da177e4 2380int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2381{
b7aa0bf7 2382 struct timeval tv;
1da177e4 2383 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2384 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2385 tv = ktime_to_timeval(sk->sk_stamp);
2386 if (tv.tv_sec == -1)
1da177e4 2387 return -ENOENT;
b7aa0bf7
ED		 2388 if (tv.tv_sec == 0) {
2389 sk->sk_stamp = ktime_get_real();
2390 tv = ktime_to_timeval(sk->sk_stamp);
2391 }
2392 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2393}
1da177e4
LT		 2394EXPORT_SYMBOL(sock_get_timestamp);
2395
ae40eb1e
ED		 2396int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2397{
2398 struct timespec ts;
2399 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2400 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2401 ts = ktime_to_timespec(sk->sk_stamp);
2402 if (ts.tv_sec == -1)
2403 return -ENOENT;
2404 if (ts.tv_sec == 0) {
2405 sk->sk_stamp = ktime_get_real();
2406 ts = ktime_to_timespec(sk->sk_stamp);
2407 }
2408 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2409}
2410EXPORT_SYMBOL(sock_get_timestampns);
2411
20d49473 2412void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2413{
20d49473 2414 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2415 unsigned long previous_flags = sk->sk_flags;
2416
20d49473
PO		 2417 sock_set_flag(sk, flag);
2418 /*
2419 * we just set one of the two flags which require net
2420 * time stamping, but time stamping might have been on
2421 * already because of the other one
2422 */
08e29af3 2423 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2424 net_enable_timestamp();
1da177e4
LT		 2425 }
2426}
1da177e4
LT		 2427
2428/*
2429 * Get a socket option on an socket.
2430 *
2431 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2432 * asynchronous errors should be reported by getsockopt. We assume
2433 * this means if you specify SO_ERROR (otherwise whats the point of it).
2434 */
2435int sock_common_getsockopt(struct socket *sock, int level, int optname,
2436 char __user *optval, int __user *optlen)
2437{
2438 struct sock *sk = sock->sk;
2439
2440 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2441}
1da177e4
LT		 2442EXPORT_SYMBOL(sock_common_getsockopt);
2443
3fdadf7d 2444#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2445int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2446 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2447{
2448 struct sock *sk = sock->sk;
2449
1e51f951 2450 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2451 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2452 optval, optlen);
3fdadf7d
DM		 2453 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2454}
2455EXPORT_SYMBOL(compat_sock_common_getsockopt);
2456#endif
2457
1da177e4
LT		 2458int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2459 struct msghdr *msg, size_t size, int flags)
2460{
2461 struct sock *sk = sock->sk;
2462 int addr_len = 0;
2463 int err;
2464
2465 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2466 flags & ~MSG_DONTWAIT, &addr_len);
2467 if (err >= 0)
2468 msg->msg_namelen = addr_len;
2469 return err;
2470}
1da177e4
LT		 2471EXPORT_SYMBOL(sock_common_recvmsg);
2472
2473/*
2474 * Set socket options on an inet socket.
2475 */
2476int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2477 char __user *optval, unsigned int optlen)
1da177e4
LT		 2478{
2479 struct sock *sk = sock->sk;
2480
2481 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2482}
1da177e4
LT		 2483EXPORT_SYMBOL(sock_common_setsockopt);
2484
3fdadf7d 2485#ifdef CONFIG_COMPAT
543d9cfe 2486int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2487 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2488{
2489 struct sock *sk = sock->sk;
2490
543d9cfe
ACM		 2491 if (sk->sk_prot->compat_setsockopt != NULL)
2492 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2493 optval, optlen);
3fdadf7d
DM		 2494 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2495}
2496EXPORT_SYMBOL(compat_sock_common_setsockopt);
2497#endif
2498
1da177e4
LT		 2499void sk_common_release(struct sock *sk)
2500{
2501 if (sk->sk_prot->destroy)
2502 sk->sk_prot->destroy(sk);
2503
2504 /*
2505 * Observation: when sock_common_release is called, processes have
2506 * no access to socket. But net still has.
2507 * Step one, detach it from networking:
2508 *
2509 * A. Remove from hash tables.
2510 */
2511
2512 sk->sk_prot->unhash(sk);
2513
2514 /*
2515 * In this point socket cannot receive new packets, but it is possible
2516 * that some packets are in flight because some CPU runs receiver and
2517 * did hash table lookup before we unhashed socket. They will achieve
2518 * receive queue and will be purged by socket destructor.
2519 *
2520 * Also we still have packets pending on receive queue and probably,
2521 * our own packets waiting in device queues. sock_destroy will drain
2522 * receive queue, but transmitted packets will delay socket destruction
2523 * until the last reference will be released.
2524 */
2525
2526 sock_orphan(sk);
2527
2528 xfrm_sk_free_policy(sk);
2529
e6848976 2530 sk_refcnt_debug_release(sk);
5640f768
ED		 2531
2532 if (sk->sk_frag.page) {
2533 put_page(sk->sk_frag.page);
2534 sk->sk_frag.page = NULL;
2535 }
2536
1da177e4
LT		 2537 sock_put(sk);
2538}
1da177e4
LT		 2539EXPORT_SYMBOL(sk_common_release);
2540
13ff3d6f
PE		 2541#ifdef CONFIG_PROC_FS
2542#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2543struct prot_inuse {
2544 int val[PROTO_INUSE_NR];
2545};
13ff3d6f
PE		 2546
2547static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2548
2549#ifdef CONFIG_NET_NS
2550void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2551{
d6d9ca0f 2552 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2553}
2554EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2555
2556int sock_prot_inuse_get(struct net *net, struct proto *prot)
2557{
2558 int cpu, idx = prot->inuse_idx;
2559 int res = 0;
2560
2561 for_each_possible_cpu(cpu)
2562 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2563
2564 return res >= 0 ? res : 0;
2565}
2566EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2567
2c8c1e72 2568static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2569{
2570 net->core.inuse = alloc_percpu(struct prot_inuse);
2571 return net->core.inuse ? 0 : -ENOMEM;
2572}
2573
2c8c1e72 2574static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2575{
2576 free_percpu(net->core.inuse);
2577}
2578
2579static struct pernet_operations net_inuse_ops = {
2580 .init = sock_inuse_init_net,
2581 .exit = sock_inuse_exit_net,
2582};
2583
2584static __init int net_inuse_init(void)
2585{
2586 if (register_pernet_subsys(&net_inuse_ops))
2587 panic("Cannot initialize net inuse counters");
2588
2589 return 0;
2590}
2591
2592core_initcall(net_inuse_init);
2593#else
1338d466
PE		 2594static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2595
c29a0bc4 2596void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2597{
d6d9ca0f 2598 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2599}
2600EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2601
c29a0bc4 2602int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2603{
2604 int cpu, idx = prot->inuse_idx;
2605 int res = 0;
2606
2607 for_each_possible_cpu(cpu)
2608 res += per_cpu(prot_inuse, cpu).val[idx];
2609
2610 return res >= 0 ? res : 0;
2611}
2612EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2613#endif
13ff3d6f
PE		 2614
2615static void assign_proto_idx(struct proto *prot)
2616{
2617 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2618
2619 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2620 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2621 return;
2622 }
2623
2624 set_bit(prot->inuse_idx, proto_inuse_idx);
2625}
2626
2627static void release_proto_idx(struct proto *prot)
2628{
2629 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2630 clear_bit(prot->inuse_idx, proto_inuse_idx);
2631}
2632#else
2633static inline void assign_proto_idx(struct proto *prot)
2634{
2635}
2636
2637static inline void release_proto_idx(struct proto *prot)
2638{
2639}
2640#endif
2641
b733c007
PE		 2642int proto_register(struct proto *prot, int alloc_slab)
2643{
1da177e4
LT		 2644 if (alloc_slab) {
2645 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2646 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2647 NULL);
1da177e4
LT		 2648
2649 if (prot->slab == NULL) {
e005d193
JP		 2650 pr_crit("%s: Can't create sock SLAB cache!\n",
2651 prot->name);
60e7663d 2652 goto out;
1da177e4 2653 }
2e6599cb
ACM		 2654
2655 if (prot->rsk_prot != NULL) {
faf23422 2656 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2657 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2658 goto out_free_sock_slab;
2659
7e56b5d6 2660 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2661 prot->rsk_prot->obj_size, 0,
20c2df83 2662 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2663
2664 if (prot->rsk_prot->slab == NULL) {
e005d193
JP		 2665 pr_crit("%s: Can't create request sock SLAB cache!\n",
2666 prot->name);
2e6599cb
ACM		 2667 goto out_free_request_sock_slab_name;
2668 }
2669 }
8feaf0c0 2670
6d6ee43e 2671 if (prot->twsk_prot != NULL) {
faf23422 2672 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2673
7e56b5d6 2674 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2675 goto out_free_request_sock_slab;
2676
6d6ee43e 2677 prot->twsk_prot->twsk_slab =
7e56b5d6 2678 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2679 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2680 0,
2681 SLAB_HWCACHE_ALIGN |
2682 prot->slab_flags,
20c2df83 2683 NULL);
6d6ee43e 2684 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2685 goto out_free_timewait_sock_slab_name;
2686 }
1da177e4
LT		 2687 }
2688
36b77a52 2689 mutex_lock(&proto_list_mutex);
1da177e4 2690 list_add(&prot->node, &proto_list);
13ff3d6f 2691 assign_proto_idx(prot);
36b77a52 2692 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2693 return 0;
2694
8feaf0c0 2695out_free_timewait_sock_slab_name:
7e56b5d6 2696 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2697out_free_request_sock_slab:
2698 if (prot->rsk_prot && prot->rsk_prot->slab) {
2699 kmem_cache_destroy(prot->rsk_prot->slab);
2700 prot->rsk_prot->slab = NULL;
2701 }
2e6599cb 2702out_free_request_sock_slab_name:
72150e9b
DC		 2703 if (prot->rsk_prot)
2704 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2705out_free_sock_slab:
2706 kmem_cache_destroy(prot->slab);
2707 prot->slab = NULL;
b733c007
PE		 2708out:
2709 return -ENOBUFS;
1da177e4 2710}
1da177e4
LT		 2711EXPORT_SYMBOL(proto_register);
2712
2713void proto_unregister(struct proto *prot)
2714{
36b77a52 2715 mutex_lock(&proto_list_mutex);
13ff3d6f 2716 release_proto_idx(prot);
0a3f4358 2717 list_del(&prot->node);
36b77a52 2718 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2719
2720 if (prot->slab != NULL) {
2721 kmem_cache_destroy(prot->slab);
2722 prot->slab = NULL;
2723 }
2724
2e6599cb 2725 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2726 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2727 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2728 prot->rsk_prot->slab = NULL;
2729 }
2730
6d6ee43e 2731 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2732 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2733 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2734 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2735 }
1da177e4 2736}
1da177e4
LT		 2737EXPORT_SYMBOL(proto_unregister);
2738
2739#ifdef CONFIG_PROC_FS
1da177e4 2740static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2741 __acquires(proto_list_mutex)
1da177e4 2742{
36b77a52 2743 mutex_lock(&proto_list_mutex);
60f0438a 2744 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2745}
2746
2747static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2748{
60f0438a 2749 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2750}
2751
2752static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2753 __releases(proto_list_mutex)
1da177e4 2754{
36b77a52 2755 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2756}
2757
2758static char proto_method_implemented(const void *method)
2759{
2760 return method == NULL ? 'n' : 'y';
2761}
180d8cd9
GC		 2762static long sock_prot_memory_allocated(struct proto *proto)
2763{
cb75a36c 2764 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2765}
2766
2767static char *sock_prot_memory_pressure(struct proto *proto)
2768{
2769 return proto->memory_pressure != NULL ?
2770 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2771}
1da177e4
LT		 2772
2773static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2774{
180d8cd9 2775
8d987e5c 2776 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2777 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2778 proto->name,
2779 proto->obj_size,
14e943db 2780 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2781 sock_prot_memory_allocated(proto),
2782 sock_prot_memory_pressure(proto),
1da177e4
LT		 2783 proto->max_header,
2784 proto->slab == NULL ? "no" : "yes",
2785 module_name(proto->owner),
2786 proto_method_implemented(proto->close),
2787 proto_method_implemented(proto->connect),
2788 proto_method_implemented(proto->disconnect),
2789 proto_method_implemented(proto->accept),
2790 proto_method_implemented(proto->ioctl),
2791 proto_method_implemented(proto->init),
2792 proto_method_implemented(proto->destroy),
2793 proto_method_implemented(proto->shutdown),
2794 proto_method_implemented(proto->setsockopt),
2795 proto_method_implemented(proto->getsockopt),
2796 proto_method_implemented(proto->sendmsg),
2797 proto_method_implemented(proto->recvmsg),
2798 proto_method_implemented(proto->sendpage),
2799 proto_method_implemented(proto->bind),
2800 proto_method_implemented(proto->backlog_rcv),
2801 proto_method_implemented(proto->hash),
2802 proto_method_implemented(proto->unhash),
2803 proto_method_implemented(proto->get_port),
2804 proto_method_implemented(proto->enter_memory_pressure));
2805}
2806
2807static int proto_seq_show(struct seq_file *seq, void *v)
2808{
60f0438a 2809 if (v == &proto_list)
1da177e4
LT		 2810 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2811 "protocol",
2812 "size",
2813 "sockets",
2814 "memory",
2815 "press",
2816 "maxhdr",
2817 "slab",
2818 "module",
2819 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2820 else
60f0438a 2821 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2822 return 0;
2823}
2824
f690808e 2825static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2826 .start = proto_seq_start,
2827 .next = proto_seq_next,
2828 .stop = proto_seq_stop,
2829 .show = proto_seq_show,
2830};
2831
2832static int proto_seq_open(struct inode *inode, struct file *file)
2833{
14e943db
ED		 2834 return seq_open_net(inode, file, &proto_seq_ops,
2835 sizeof(struct seq_net_private));
1da177e4
LT		 2836}
2837
9a32144e 2838static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2839 .owner = THIS_MODULE,
2840 .open = proto_seq_open,
2841 .read = seq_read,
2842 .llseek = seq_lseek,
14e943db
ED		 2843 .release = seq_release_net,
2844};
2845
2846static __net_init int proto_init_net(struct net *net)
2847{
d4beaa66 2848 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 2849 return -ENOMEM;
2850
2851 return 0;
2852}
2853
2854static __net_exit void proto_exit_net(struct net *net)
2855{
ece31ffd 2856 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 2857}
2858
2859
2860static __net_initdata struct pernet_operations proto_net_ops = {
2861 .init = proto_init_net,
2862 .exit = proto_exit_net,
1da177e4
LT		 2863};
2864
2865static int __init proto_init(void)
2866{
14e943db 2867 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2868}
2869
2870subsys_initcall(proto_init);
2871
2872#endif /* PROC_FS */
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