]> git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blame - net/core/sock.c
projects / mirror_ubuntu-zesty-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
sock: only define socket limit if mem cgroup configured
[mirror_ubuntu-zesty-kernel.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
4ec93edb 35 * code. The ACK stuff can wait and needs major
1da177e4
LT		 36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 *
85 *
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
90 */
91
e005d193
JP		 92#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
93
4fc268d2 94#include <linux/capability.h>
1da177e4
LT		 95#include <linux/errno.h>
96#include <linux/types.h>
97#include <linux/socket.h>
98#include <linux/in.h>
99#include <linux/kernel.h>
1da177e4
LT		 100#include <linux/module.h>
101#include <linux/proc_fs.h>
102#include <linux/seq_file.h>
103#include <linux/sched.h>
104#include <linux/timer.h>
105#include <linux/string.h>
106#include <linux/sockios.h>
107#include <linux/net.h>
108#include <linux/mm.h>
109#include <linux/slab.h>
110#include <linux/interrupt.h>
111#include <linux/poll.h>
112#include <linux/tcp.h>
113#include <linux/init.h>
a1f8e7f7 114#include <linux/highmem.h>
3f551f94 115#include <linux/user_namespace.h>
c5905afb 116#include <linux/static_key.h>
3969eb38 117#include <linux/memcontrol.h>
8c1ae10d 118#include <linux/prefetch.h>
1da177e4
LT		 119
120#include <asm/uaccess.h>
1da177e4
LT		 121
122#include <linux/netdevice.h>
123#include <net/protocol.h>
124#include <linux/skbuff.h>
457c4cbc 125#include <net/net_namespace.h>
2e6599cb 126#include <net/request_sock.h>
1da177e4 127#include <net/sock.h>
20d49473 128#include <linux/net_tstamp.h>
1da177e4
LT		 129#include <net/xfrm.h>
130#include <linux/ipsec.h>
f8451725 131#include <net/cls_cgroup.h>
5bc1421e 132#include <net/netprio_cgroup.h>
1da177e4
LT		 133
134#include <linux/filter.h>
135
3847ce32
SM		 136#include <trace/events/sock.h>
137
1da177e4
LT		 138#ifdef CONFIG_INET
139#include <net/tcp.h>
140#endif
141
36b77a52 142static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 143static LIST_HEAD(proto_list);
144
c255a458 145#ifdef CONFIG_MEMCG_KMEM
1d62e436 146int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
d1a4c0b3
GC		 147{
148 struct proto *proto;
149 int ret = 0;
150
36b77a52 151 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 152 list_for_each_entry(proto, &proto_list, node) {
153 if (proto->init_cgroup) {
1d62e436 154 ret = proto->init_cgroup(memcg, ss);
d1a4c0b3
GC		 155 if (ret)
156 goto out;
157 }
158 }
159
36b77a52 160 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 161 return ret;
162out:
163 list_for_each_entry_continue_reverse(proto, &proto_list, node)
164 if (proto->destroy_cgroup)
1d62e436 165 proto->destroy_cgroup(memcg);
36b77a52 166 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 167 return ret;
168}
169
1d62e436 170void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
d1a4c0b3
GC		 171{
172 struct proto *proto;
173
36b77a52 174 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 175 list_for_each_entry_reverse(proto, &proto_list, node)
176 if (proto->destroy_cgroup)
1d62e436 177 proto->destroy_cgroup(memcg);
36b77a52 178 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 179}
180#endif
181
da21f24d
IM		 182/*
183 * Each address family might have different locking rules, so we have
184 * one slock key per address family:
185 */
a5b5bb9a
IM		 186static struct lock_class_key af_family_keys[AF_MAX];
187static struct lock_class_key af_family_slock_keys[AF_MAX];
188
cbda4eaf 189#if defined(CONFIG_MEMCG_KMEM)
c5905afb 190struct static_key memcg_socket_limit_enabled;
e1aab161 191EXPORT_SYMBOL(memcg_socket_limit_enabled);
cbda4eaf 192#endif
e1aab161 193
a5b5bb9a
IM		 194/*
195 * Make lock validator output more readable. (we pre-construct these
196 * strings build-time, so that runtime initialization of socket
197 * locks is fast):
198 */
36cbd3dc 199static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 200 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
201 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
202 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
203 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
204 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
205 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
206 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 207 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 208 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 209 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 210 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 211 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 212 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
c7fe3b52 213 "sk_lock-AF_NFC" , "sk_lock-AF_MAX"
a5b5bb9a 214};
36cbd3dc 215static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 216 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
217 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
218 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
219 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
220 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
221 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
222 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 223 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 224 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 225 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 226 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 227 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 228 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
c7fe3b52 229 "slock-AF_NFC" , "slock-AF_MAX"
a5b5bb9a 230};
36cbd3dc 231static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 232 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
233 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
234 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
235 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
236 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
237 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
238 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 239 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 240 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 241 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 242 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 243 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 244 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
c7fe3b52 245 "clock-AF_NFC" , "clock-AF_MAX"
443aef0e 246};
da21f24d
IM		 247
248/*
249 * sk_callback_lock locking rules are per-address-family,
250 * so split the lock classes by using a per-AF key:
251 */
252static struct lock_class_key af_callback_keys[AF_MAX];
253
1da177e4
LT		 254/* Take into consideration the size of the struct sk_buff overhead in the
255 * determination of these values, since that is non-constant across
256 * platforms. This makes socket queueing behavior and performance
257 * not depend upon such differences.
258 */
259#define _SK_MEM_PACKETS 256
87fb4b7b 260#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 261#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
262#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
263
264/* Run time adjustable parameters. */
ab32ea5d 265__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 266EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 267__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 268EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 269__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
270__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 271
25985edc 272/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 273int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 274EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 275
c93bdd0e
MG		 276struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
277EXPORT_SYMBOL_GPL(memalloc_socks);
278
7cb02404
MG		 279/**
280 * sk_set_memalloc - sets %SOCK_MEMALLOC
281 * @sk: socket to set it on
282 *
283 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
284 * It's the responsibility of the admin to adjust min_free_kbytes
285 * to meet the requirements
286 */
287void sk_set_memalloc(struct sock *sk)
288{
289 sock_set_flag(sk, SOCK_MEMALLOC);
290 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 291 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 292}
293EXPORT_SYMBOL_GPL(sk_set_memalloc);
294
295void sk_clear_memalloc(struct sock *sk)
296{
297 sock_reset_flag(sk, SOCK_MEMALLOC);
298 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 299 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 300
301 /*
302 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
303 * progress of swapping. However, if SOCK_MEMALLOC is cleared while
304 * it has rmem allocations there is a risk that the user of the
305 * socket cannot make forward progress due to exceeding the rmem
306 * limits. By rights, sk_clear_memalloc() should only be called
307 * on sockets being torn down but warn and reset the accounting if
308 * that assumption breaks.
309 */
310 if (WARN_ON(sk->sk_forward_alloc))
311 sk_mem_reclaim(sk);
7cb02404
MG		 312}
313EXPORT_SYMBOL_GPL(sk_clear_memalloc);
314
b4b9e355
MG		 315int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
316{
317 int ret;
318 unsigned long pflags = current->flags;
319
320 /* these should have been dropped before queueing */
321 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
322
323 current->flags |= PF_MEMALLOC;
324 ret = sk->sk_backlog_rcv(sk, skb);
325 tsk_restore_flags(current, pflags, PF_MEMALLOC);
326
327 return ret;
328}
329EXPORT_SYMBOL(__sk_backlog_rcv);
330
1da177e4
LT		 331static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
332{
333 struct timeval tv;
334
335 if (optlen < sizeof(tv))
336 return -EINVAL;
337 if (copy_from_user(&tv, optval, sizeof(tv)))
338 return -EFAULT;
ba78073e
VA		 339 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
340 return -EDOM;
1da177e4 341
ba78073e 342 if (tv.tv_sec < 0) {
6f11df83
AM		 343 static int warned __read_mostly;
344
ba78073e 345 *timeo_p = 0;
50aab54f 346 if (warned < 10 && net_ratelimit()) {
ba78073e 347 warned++;
e005d193
JP		 348 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
349 __func__, current->comm, task_pid_nr(current));
50aab54f 350 }
ba78073e
VA		 351 return 0;
352 }
1da177e4
LT		 353 *timeo_p = MAX_SCHEDULE_TIMEOUT;
354 if (tv.tv_sec == 0 && tv.tv_usec == 0)
355 return 0;
356 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
357 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
358 return 0;
359}
360
361static void sock_warn_obsolete_bsdism(const char *name)
362{
363 static int warned;
364 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 365 if (strcmp(warncomm, current->comm) && warned < 5) {
366 strcpy(warncomm, current->comm);
e005d193
JP		 367 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
368 warncomm, name);
1da177e4
LT		 369 warned++;
370 }
371}
372
08e29af3
ED		 373#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
374
375static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 376{
08e29af3
ED		 377 if (sk->sk_flags & flags) {
378 sk->sk_flags &= ~flags;
379 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 380 net_disable_timestamp();
1da177e4
LT		 381 }
382}
383
384
f0088a50
DV		 385int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
386{
766e9037 387 int err;
f0088a50 388 int skb_len;
3b885787
NH		 389 unsigned long flags;
390 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 391
0fd7bac6 392 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 393 atomic_inc(&sk->sk_drops);
3847ce32 394 trace_sock_rcvqueue_full(sk, skb);
766e9037 395 return -ENOMEM;
f0088a50
DV		 396 }
397
fda9ef5d 398 err = sk_filter(sk, skb);
f0088a50 399 if (err)
766e9037 400 return err;
f0088a50 401
c76562b6 402 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 403 atomic_inc(&sk->sk_drops);
404 return -ENOBUFS;
3ab224be
HA		 405 }
406
f0088a50
DV		 407 skb->dev = NULL;
408 skb_set_owner_r(skb, sk);
49ad9599 409
f0088a50
DV		 410 /* Cache the SKB length before we tack it onto the receive
411 * queue. Once it is added it no longer belongs to us and
412 * may be freed by other threads of control pulling packets
413 * from the queue.
414 */
415 skb_len = skb->len;
416
7fee226a
ED		 417 /* we escape from rcu protected region, make sure we dont leak
418 * a norefcounted dst
419 */
420 skb_dst_force(skb);
421
3b885787
NH		 422 spin_lock_irqsave(&list->lock, flags);
423 skb->dropcount = atomic_read(&sk->sk_drops);
424 __skb_queue_tail(list, skb);
425 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 426
427 if (!sock_flag(sk, SOCK_DEAD))
428 sk->sk_data_ready(sk, skb_len);
766e9037 429 return 0;
f0088a50
DV		 430}
431EXPORT_SYMBOL(sock_queue_rcv_skb);
432
58a5a7b9 433int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 434{
435 int rc = NET_RX_SUCCESS;
436
fda9ef5d 437 if (sk_filter(sk, skb))
f0088a50
DV		 438 goto discard_and_relse;
439
440 skb->dev = NULL;
441
f545a38f 442 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) {
c377411f
ED		 443 atomic_inc(&sk->sk_drops);
444 goto discard_and_relse;
445 }
58a5a7b9
ACM		 446 if (nested)
447 bh_lock_sock_nested(sk);
448 else
449 bh_lock_sock(sk);
a5b5bb9a
IM		 450 if (!sock_owned_by_user(sk)) {
451 /*
452 * trylock + unlock semantics:
453 */
454 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
455
c57943a1 456 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 457
458 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 459 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 460 bh_unlock_sock(sk);
461 atomic_inc(&sk->sk_drops);
462 goto discard_and_relse;
463 }
464
f0088a50
DV		 465 bh_unlock_sock(sk);
466out:
467 sock_put(sk);
468 return rc;
469discard_and_relse:
470 kfree_skb(skb);
471 goto out;
472}
473EXPORT_SYMBOL(sk_receive_skb);
474
ea94ff3b
KK		 475void sk_reset_txq(struct sock *sk)
476{
477 sk_tx_queue_clear(sk);
478}
479EXPORT_SYMBOL(sk_reset_txq);
480
f0088a50
DV		 481struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
482{
b6c6712a 483 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 484
485 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 486 sk_tx_queue_clear(sk);
a9b3cd7f 487 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 488 dst_release(dst);
489 return NULL;
490 }
491
492 return dst;
493}
494EXPORT_SYMBOL(__sk_dst_check);
495
496struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
497{
498 struct dst_entry *dst = sk_dst_get(sk);
499
500 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
501 sk_dst_reset(sk);
502 dst_release(dst);
503 return NULL;
504 }
505
506 return dst;
507}
508EXPORT_SYMBOL(sk_dst_check);
509
c91f6df2
BH		 510static int sock_setbindtodevice(struct sock *sk, char __user *optval,
511 int optlen)
4878809f
DM		 512{
513 int ret = -ENOPROTOOPT;
514#ifdef CONFIG_NETDEVICES
3b1e0a65 515 struct net *net = sock_net(sk);
4878809f
DM		 516 char devname[IFNAMSIZ];
517 int index;
518
519 /* Sorry... */
520 ret = -EPERM;
5e1fccc0 521 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 522 goto out;
523
524 ret = -EINVAL;
525 if (optlen < 0)
526 goto out;
527
528 /* Bind this socket to a particular device like "eth0",
529 * as specified in the passed interface name. If the
530 * name is "" or the option length is zero the socket
531 * is not bound.
532 */
533 if (optlen > IFNAMSIZ - 1)
534 optlen = IFNAMSIZ - 1;
535 memset(devname, 0, sizeof(devname));
536
537 ret = -EFAULT;
538 if (copy_from_user(devname, optval, optlen))
539 goto out;
540
000ba2e4
DM		 541 index = 0;
542 if (devname[0] != '\0') {
bf8e56bf 543 struct net_device *dev;
4878809f 544
bf8e56bf
ED		 545 rcu_read_lock();
546 dev = dev_get_by_name_rcu(net, devname);
547 if (dev)
548 index = dev->ifindex;
549 rcu_read_unlock();
4878809f
DM		 550 ret = -ENODEV;
551 if (!dev)
552 goto out;
4878809f
DM		 553 }
554
555 lock_sock(sk);
556 sk->sk_bound_dev_if = index;
557 sk_dst_reset(sk);
558 release_sock(sk);
559
560 ret = 0;
561
562out:
563#endif
564
565 return ret;
566}
567
c91f6df2
BH		 568static int sock_getbindtodevice(struct sock *sk, char __user *optval,
569 int __user *optlen, int len)
570{
571 int ret = -ENOPROTOOPT;
572#ifdef CONFIG_NETDEVICES
573 struct net *net = sock_net(sk);
574 struct net_device *dev;
575 char devname[IFNAMSIZ];
576 unsigned seq;
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
587retry:
30e6c9fa 588 seq = read_seqcount_begin(&devnet_rename_seq);
c91f6df2
BH		 589 rcu_read_lock();
590 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
591 ret = -ENODEV;
592 if (!dev) {
593 rcu_read_unlock();
594 goto out;
595 }
596
597 strcpy(devname, dev->name);
598 rcu_read_unlock();
30e6c9fa 599 if (read_seqcount_retry(&devnet_rename_seq, seq))
c91f6df2
BH		 600 goto retry;
601
602 len = strlen(devname) + 1;
603
604 ret = -EFAULT;
605 if (copy_to_user(optval, devname, len))
606 goto out;
607
608zero:
609 ret = -EFAULT;
610 if (put_user(len, optlen))
611 goto out;
612
613 ret = 0;
614
615out:
616#endif
617
618 return ret;
619}
620
c0ef877b
PE		 621static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
622{
623 if (valbool)
624 sock_set_flag(sk, bit);
625 else
626 sock_reset_flag(sk, bit);
627}
628
1da177e4
LT		 629/*
630 * This is meant for all protocols to use and covers goings on
631 * at the socket level. Everything here is generic.
632 */
633
634int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 635 char __user *optval, unsigned int optlen)
1da177e4 636{
2a91525c 637 struct sock *sk = sock->sk;
1da177e4
LT		 638 int val;
639 int valbool;
640 struct linger ling;
641 int ret = 0;
4ec93edb 642
1da177e4
LT		 643 /*
644 * Options without arguments
645 */
646
4878809f 647 if (optname == SO_BINDTODEVICE)
c91f6df2 648 return sock_setbindtodevice(sk, optval, optlen);
4878809f 649
e71a4783
SH		 650 if (optlen < sizeof(int))
651 return -EINVAL;
4ec93edb 652
1da177e4
LT		 653 if (get_user(val, (int __user *)optval))
654 return -EFAULT;
4ec93edb 655
2a91525c 656 valbool = val ? 1 : 0;
1da177e4
LT		 657
658 lock_sock(sk);
659
2a91525c 660 switch (optname) {
e71a4783 661 case SO_DEBUG:
2a91525c 662 if (val && !capable(CAP_NET_ADMIN))
e71a4783 663 ret = -EACCES;
2a91525c 664 else
c0ef877b 665 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 666 break;
667 case SO_REUSEADDR:
4a17fd52 668 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 669 break;
055dc21a
TH		 670 case SO_REUSEPORT:
671 sk->sk_reuseport = valbool;
672 break;
e71a4783 673 case SO_TYPE:
49c794e9 674 case SO_PROTOCOL:
0d6038ee 675 case SO_DOMAIN:
e71a4783
SH		 676 case SO_ERROR:
677 ret = -ENOPROTOOPT;
678 break;
679 case SO_DONTROUTE:
c0ef877b 680 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 681 break;
682 case SO_BROADCAST:
683 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
684 break;
685 case SO_SNDBUF:
686 /* Don't error on this BSD doesn't and if you think
82981930
ED		 687 * about it this is right. Otherwise apps have to
688 * play 'guess the biggest size' games. RCVBUF/SNDBUF
689 * are treated in BSD as hints
690 */
691 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 692set_sndbuf:
e71a4783 693 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 694 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
695 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 696 sk->sk_write_space(sk);
697 break;
1da177e4 698
e71a4783
SH		 699 case SO_SNDBUFFORCE:
700 if (!capable(CAP_NET_ADMIN)) {
701 ret = -EPERM;
702 break;
703 }
704 goto set_sndbuf;
b0573dea 705
e71a4783
SH		 706 case SO_RCVBUF:
707 /* Don't error on this BSD doesn't and if you think
82981930
ED		 708 * about it this is right. Otherwise apps have to
709 * play 'guess the biggest size' games. RCVBUF/SNDBUF
710 * are treated in BSD as hints
711 */
712 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 713set_rcvbuf:
e71a4783
SH		 714 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
715 /*
716 * We double it on the way in to account for
717 * "struct sk_buff" etc. overhead. Applications
718 * assume that the SO_RCVBUF setting they make will
719 * allow that much actual data to be received on that
720 * socket.
721 *
722 * Applications are unaware that "struct sk_buff" and
723 * other overheads allocate from the receive buffer
724 * during socket buffer allocation.
725 *
726 * And after considering the possible alternatives,
727 * returning the value we actually used in getsockopt
728 * is the most desirable behavior.
729 */
82981930 730 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 731 break;
732
733 case SO_RCVBUFFORCE:
734 if (!capable(CAP_NET_ADMIN)) {
735 ret = -EPERM;
1da177e4 736 break;
e71a4783
SH		 737 }
738 goto set_rcvbuf;
1da177e4 739
e71a4783 740 case SO_KEEPALIVE:
1da177e4 741#ifdef CONFIG_INET
3e10986d
ED		 742 if (sk->sk_protocol == IPPROTO_TCP &&
743 sk->sk_type == SOCK_STREAM)
e71a4783 744 tcp_set_keepalive(sk, valbool);
1da177e4 745#endif
e71a4783
SH		 746 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
747 break;
748
749 case SO_OOBINLINE:
750 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
751 break;
752
753 case SO_NO_CHECK:
754 sk->sk_no_check = valbool;
755 break;
756
757 case SO_PRIORITY:
5e1fccc0
EB		 758 if ((val >= 0 && val <= 6) ||
759 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 760 sk->sk_priority = val;
761 else
762 ret = -EPERM;
763 break;
764
765 case SO_LINGER:
766 if (optlen < sizeof(ling)) {
767 ret = -EINVAL; /* 1003.1g */
1da177e4 768 break;
e71a4783 769 }
2a91525c 770 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 771 ret = -EFAULT;
1da177e4 772 break;
e71a4783
SH		 773 }
774 if (!ling.l_onoff)
775 sock_reset_flag(sk, SOCK_LINGER);
776 else {
1da177e4 777#if (BITS_PER_LONG == 32)
e71a4783
SH		 778 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
779 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 780 else
e71a4783
SH		 781#endif
782 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
783 sock_set_flag(sk, SOCK_LINGER);
784 }
785 break;
786
787 case SO_BSDCOMPAT:
788 sock_warn_obsolete_bsdism("setsockopt");
789 break;
790
791 case SO_PASSCRED:
792 if (valbool)
793 set_bit(SOCK_PASSCRED, &sock->flags);
794 else
795 clear_bit(SOCK_PASSCRED, &sock->flags);
796 break;
797
798 case SO_TIMESTAMP:
92f37fd2 799 case SO_TIMESTAMPNS:
e71a4783 800 if (valbool) {
92f37fd2
ED		 801 if (optname == SO_TIMESTAMP)
802 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
803 else
804 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 805 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 806 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 807 } else {
e71a4783 808 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 809 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
810 }
e71a4783
SH		 811 break;
812
20d49473
PO		 813 case SO_TIMESTAMPING:
814 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 815 ret = -EINVAL;
20d49473
PO		 816 break;
817 }
818 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
819 val & SOF_TIMESTAMPING_TX_HARDWARE);
820 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
821 val & SOF_TIMESTAMPING_TX_SOFTWARE);
822 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
823 val & SOF_TIMESTAMPING_RX_HARDWARE);
824 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
825 sock_enable_timestamp(sk,
826 SOCK_TIMESTAMPING_RX_SOFTWARE);
827 else
828 sock_disable_timestamp(sk,
08e29af3 829 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 830 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
831 val & SOF_TIMESTAMPING_SOFTWARE);
832 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
833 val & SOF_TIMESTAMPING_SYS_HARDWARE);
834 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
835 val & SOF_TIMESTAMPING_RAW_HARDWARE);
836 break;
837
e71a4783
SH		 838 case SO_RCVLOWAT:
839 if (val < 0)
840 val = INT_MAX;
841 sk->sk_rcvlowat = val ? : 1;
842 break;
843
844 case SO_RCVTIMEO:
845 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
846 break;
847
848 case SO_SNDTIMEO:
849 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
850 break;
1da177e4 851
e71a4783
SH		 852 case SO_ATTACH_FILTER:
853 ret = -EINVAL;
854 if (optlen == sizeof(struct sock_fprog)) {
855 struct sock_fprog fprog;
1da177e4 856
e71a4783
SH		 857 ret = -EFAULT;
858 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 859 break;
e71a4783
SH		 860
861 ret = sk_attach_filter(&fprog, sk);
862 }
863 break;
864
865 case SO_DETACH_FILTER:
55b33325 866 ret = sk_detach_filter(sk);
e71a4783 867 break;
1da177e4 868
d59577b6
VB		 869 case SO_LOCK_FILTER:
870 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
871 ret = -EPERM;
872 else
873 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
874 break;
875
e71a4783
SH		 876 case SO_PASSSEC:
877 if (valbool)
878 set_bit(SOCK_PASSSEC, &sock->flags);
879 else
880 clear_bit(SOCK_PASSSEC, &sock->flags);
881 break;
4a19ec58 882 case SO_MARK:
5e1fccc0 883 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 884 ret = -EPERM;
2a91525c 885 else
4a19ec58 886 sk->sk_mark = val;
4a19ec58 887 break;
877ce7c1 888
1da177e4
LT		 889 /* We implement the SO_SNDLOWAT etc to
890 not be settable (1003.1g 5.3) */
3b885787 891 case SO_RXQ_OVFL:
8083f0fc 892 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 893 break;
6e3e939f
JB		 894
895 case SO_WIFI_STATUS:
896 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
897 break;
898
ef64a54f
PE		 899 case SO_PEEK_OFF:
900 if (sock->ops->set_peek_off)
901 sock->ops->set_peek_off(sk, val);
902 else
903 ret = -EOPNOTSUPP;
904 break;
3bdc0eba
BG		 905
906 case SO_NOFCS:
907 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
908 break;
909
e71a4783
SH		 910 default:
911 ret = -ENOPROTOOPT;
912 break;
4ec93edb 913 }
1da177e4
LT		 914 release_sock(sk);
915 return ret;
916}
2a91525c 917EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 918
919
3f551f94
EB		 920void cred_to_ucred(struct pid *pid, const struct cred *cred,
921 struct ucred *ucred)
922{
923 ucred->pid = pid_vnr(pid);
924 ucred->uid = ucred->gid = -1;
925 if (cred) {
926 struct user_namespace *current_ns = current_user_ns();
927
b2e4f544
EB		 928 ucred->uid = from_kuid_munged(current_ns, cred->euid);
929 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 930 }
931}
3924773a 932EXPORT_SYMBOL_GPL(cred_to_ucred);
3f551f94 933
1da177e4
LT		 934int sock_getsockopt(struct socket *sock, int level, int optname,
935 char __user *optval, int __user *optlen)
936{
937 struct sock *sk = sock->sk;
4ec93edb 938
e71a4783 939 union {
4ec93edb
YH		 940 int val;
941 struct linger ling;
1da177e4
LT		 942 struct timeval tm;
943 } v;
4ec93edb 944
4d0392be 945 int lv = sizeof(int);
1da177e4 946 int len;
4ec93edb 947
e71a4783 948 if (get_user(len, optlen))
4ec93edb 949 return -EFAULT;
e71a4783 950 if (len < 0)
1da177e4 951 return -EINVAL;
4ec93edb 952
50fee1de 953 memset(&v, 0, sizeof(v));
df0bca04 954
2a91525c 955 switch (optname) {
e71a4783
SH		 956 case SO_DEBUG:
957 v.val = sock_flag(sk, SOCK_DBG);
958 break;
959
960 case SO_DONTROUTE:
961 v.val = sock_flag(sk, SOCK_LOCALROUTE);
962 break;
963
964 case SO_BROADCAST:
1b23a5df 965 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 966 break;
967
968 case SO_SNDBUF:
969 v.val = sk->sk_sndbuf;
970 break;
971
972 case SO_RCVBUF:
973 v.val = sk->sk_rcvbuf;
974 break;
975
976 case SO_REUSEADDR:
977 v.val = sk->sk_reuse;
978 break;
979
055dc21a
TH		 980 case SO_REUSEPORT:
981 v.val = sk->sk_reuseport;
982 break;
983
e71a4783 984 case SO_KEEPALIVE:
1b23a5df 985 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 986 break;
987
988 case SO_TYPE:
989 v.val = sk->sk_type;
990 break;
991
49c794e9
JE		 992 case SO_PROTOCOL:
993 v.val = sk->sk_protocol;
994 break;
995
0d6038ee
JE		 996 case SO_DOMAIN:
997 v.val = sk->sk_family;
998 break;
999
e71a4783
SH		 1000 case SO_ERROR:
1001 v.val = -sock_error(sk);
2a91525c 1002 if (v.val == 0)
e71a4783
SH		 1003 v.val = xchg(&sk->sk_err_soft, 0);
1004 break;
1005
1006 case SO_OOBINLINE:
1b23a5df 1007 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1008 break;
1009
1010 case SO_NO_CHECK:
1011 v.val = sk->sk_no_check;
1012 break;
1013
1014 case SO_PRIORITY:
1015 v.val = sk->sk_priority;
1016 break;
1017
1018 case SO_LINGER:
1019 lv = sizeof(v.ling);
1b23a5df 1020 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1021 v.ling.l_linger = sk->sk_lingertime / HZ;
1022 break;
1023
1024 case SO_BSDCOMPAT:
1025 sock_warn_obsolete_bsdism("getsockopt");
1026 break;
1027
1028 case SO_TIMESTAMP:
92f37fd2
ED		 1029 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1030 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1031 break;
1032
1033 case SO_TIMESTAMPNS:
1034 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1035 break;
1036
20d49473
PO		 1037 case SO_TIMESTAMPING:
1038 v.val = 0;
1039 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
1040 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
1041 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
1042 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
1043 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
1044 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
1045 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1046 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
1047 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
1048 v.val |= SOF_TIMESTAMPING_SOFTWARE;
1049 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
1050 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
1051 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
1052 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
1053 break;
1054
e71a4783 1055 case SO_RCVTIMEO:
2a91525c 1056 lv = sizeof(struct timeval);
e71a4783
SH		 1057 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1058 v.tm.tv_sec = 0;
1059 v.tm.tv_usec = 0;
1060 } else {
1061 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1062 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1063 }
1064 break;
1065
1066 case SO_SNDTIMEO:
2a91525c 1067 lv = sizeof(struct timeval);
e71a4783
SH		 1068 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1069 v.tm.tv_sec = 0;
1070 v.tm.tv_usec = 0;
1071 } else {
1072 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1073 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1074 }
1075 break;
1da177e4 1076
e71a4783
SH		 1077 case SO_RCVLOWAT:
1078 v.val = sk->sk_rcvlowat;
1079 break;
1da177e4 1080
e71a4783 1081 case SO_SNDLOWAT:
2a91525c 1082 v.val = 1;
e71a4783 1083 break;
1da177e4 1084
e71a4783 1085 case SO_PASSCRED:
82981930 1086 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1087 break;
1da177e4 1088
e71a4783 1089 case SO_PEERCRED:
109f6e39
EB		 1090 {
1091 struct ucred peercred;
1092 if (len > sizeof(peercred))
1093 len = sizeof(peercred);
1094 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1095 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1096 return -EFAULT;
1097 goto lenout;
109f6e39 1098 }
1da177e4 1099
e71a4783
SH		 1100 case SO_PEERNAME:
1101 {
1102 char address[128];
1103
1104 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1105 return -ENOTCONN;
1106 if (lv < len)
1107 return -EINVAL;
1108 if (copy_to_user(optval, address, len))
1109 return -EFAULT;
1110 goto lenout;
1111 }
1da177e4 1112
e71a4783
SH		 1113 /* Dubious BSD thing... Probably nobody even uses it, but
1114 * the UNIX standard wants it for whatever reason... -DaveM
1115 */
1116 case SO_ACCEPTCONN:
1117 v.val = sk->sk_state == TCP_LISTEN;
1118 break;
1da177e4 1119
e71a4783 1120 case SO_PASSSEC:
82981930 1121 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1122 break;
877ce7c1 1123
e71a4783
SH		 1124 case SO_PEERSEC:
1125 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1126
4a19ec58
LAT		 1127 case SO_MARK:
1128 v.val = sk->sk_mark;
1129 break;
1130
3b885787 1131 case SO_RXQ_OVFL:
1b23a5df 1132 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1133 break;
1134
6e3e939f 1135 case SO_WIFI_STATUS:
1b23a5df 1136 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1137 break;
1138
ef64a54f
PE		 1139 case SO_PEEK_OFF:
1140 if (!sock->ops->set_peek_off)
1141 return -EOPNOTSUPP;
1142
1143 v.val = sk->sk_peek_off;
1144 break;
bc2f7996 1145 case SO_NOFCS:
1b23a5df 1146 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1147 break;
c91f6df2 1148
f7b86bfe 1149 case SO_BINDTODEVICE:
c91f6df2
BH		 1150 return sock_getbindtodevice(sk, optval, optlen, len);
1151
a8fc9277
PE		 1152 case SO_GET_FILTER:
1153 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1154 if (len < 0)
1155 return len;
1156
1157 goto lenout;
c91f6df2 1158
d59577b6
VB		 1159 case SO_LOCK_FILTER:
1160 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1161 break;
1162
e71a4783
SH		 1163 default:
1164 return -ENOPROTOOPT;
1da177e4 1165 }
e71a4783 1166
1da177e4
LT		 1167 if (len > lv)
1168 len = lv;
1169 if (copy_to_user(optval, &v, len))
1170 return -EFAULT;
1171lenout:
4ec93edb
YH		 1172 if (put_user(len, optlen))
1173 return -EFAULT;
1174 return 0;
1da177e4
LT		 1175}
1176
a5b5bb9a
IM		 1177/*
1178 * Initialize an sk_lock.
1179 *
1180 * (We also register the sk_lock with the lock validator.)
1181 */
b6f99a21 1182static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1183{
ed07536e
PZ		 1184 sock_lock_init_class_and_name(sk,
1185 af_family_slock_key_strings[sk->sk_family],
1186 af_family_slock_keys + sk->sk_family,
1187 af_family_key_strings[sk->sk_family],
1188 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1189}
1190
4dc6dc71
ED		 1191/*
1192 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1193 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1194 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1195 */
f1a6c4da
PE		 1196static void sock_copy(struct sock *nsk, const struct sock *osk)
1197{
1198#ifdef CONFIG_SECURITY_NETWORK
1199 void *sptr = nsk->sk_security;
1200#endif
68835aba
ED		 1201 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1202
1203 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1204 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1205
f1a6c4da
PE		 1206#ifdef CONFIG_SECURITY_NETWORK
1207 nsk->sk_security = sptr;
1208 security_sk_clone(osk, nsk);
1209#endif
1210}
1211
fcbdf09d
OP		 1212/*
1213 * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes
1214 * un-modified. Special care is taken when initializing object to zero.
1215 */
1216static inline void sk_prot_clear_nulls(struct sock *sk, int size)
1217{
1218 if (offsetof(struct sock, sk_node.next) != 0)
1219 memset(sk, 0, offsetof(struct sock, sk_node.next));
1220 memset(&sk->sk_node.pprev, 0,
1221 size - offsetof(struct sock, sk_node.pprev));
1222}
1223
1224void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1225{
1226 unsigned long nulls1, nulls2;
1227
1228 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1229 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1230 if (nulls1 > nulls2)
1231 swap(nulls1, nulls2);
1232
1233 if (nulls1 != 0)
1234 memset((char *)sk, 0, nulls1);
1235 memset((char *)sk + nulls1 + sizeof(void *), 0,
1236 nulls2 - nulls1 - sizeof(void *));
1237 memset((char *)sk + nulls2 + sizeof(void *), 0,
1238 size - nulls2 - sizeof(void *));
1239}
1240EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1241
2e4afe7b
PE		 1242static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1243 int family)
c308c1b2
PE		 1244{
1245 struct sock *sk;
1246 struct kmem_cache *slab;
1247
1248 slab = prot->slab;
e912b114
ED		 1249 if (slab != NULL) {
1250 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1251 if (!sk)
1252 return sk;
1253 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1254 if (prot->clear_sk)
1255 prot->clear_sk(sk, prot->obj_size);
1256 else
1257 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1258 }
fcbdf09d 1259 } else
c308c1b2
PE		 1260 sk = kmalloc(prot->obj_size, priority);
1261
2e4afe7b 1262 if (sk != NULL) {
a98b65a3
VN		 1263 kmemcheck_annotate_bitfield(sk, flags);
1264
2e4afe7b
PE		 1265 if (security_sk_alloc(sk, family, priority))
1266 goto out_free;
1267
1268 if (!try_module_get(prot->owner))
1269 goto out_free_sec;
e022f0b4 1270 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1271 }
1272
c308c1b2 1273 return sk;
2e4afe7b
PE		 1274
1275out_free_sec:
1276 security_sk_free(sk);
1277out_free:
1278 if (slab != NULL)
1279 kmem_cache_free(slab, sk);
1280 else
1281 kfree(sk);
1282 return NULL;
c308c1b2
PE		 1283}
1284
1285static void sk_prot_free(struct proto *prot, struct sock *sk)
1286{
1287 struct kmem_cache *slab;
2e4afe7b 1288 struct module *owner;
c308c1b2 1289
2e4afe7b 1290 owner = prot->owner;
c308c1b2 1291 slab = prot->slab;
2e4afe7b
PE		 1292
1293 security_sk_free(sk);
c308c1b2
PE		 1294 if (slab != NULL)
1295 kmem_cache_free(slab, sk);
1296 else
1297 kfree(sk);
2e4afe7b 1298 module_put(owner);
c308c1b2
PE		 1299}
1300
f8451725 1301#ifdef CONFIG_CGROUPS
8fb974c9 1302#if IS_ENABLED(CONFIG_NET_CLS_CGROUP)
fd9a08a7 1303void sock_update_classid(struct sock *sk, struct task_struct *task)
f8451725 1304{
1144182a 1305 u32 classid;
f8451725 1306
fd9a08a7 1307 classid = task_cls_classid(task);
3afa6d00 1308 if (classid != sk->sk_classid)
f8451725
HX		 1309 sk->sk_classid = classid;
1310}
82862742 1311EXPORT_SYMBOL(sock_update_classid);
8fb974c9 1312#endif
5bc1421e 1313
51e4e7fa 1314#if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
406a3c63 1315void sock_update_netprioidx(struct sock *sk, struct task_struct *task)
5bc1421e 1316{
5bc1421e
NH		 1317 if (in_interrupt())
1318 return;
2b73bc65 1319
406a3c63 1320 sk->sk_cgrp_prioidx = task_netprioidx(task);
5bc1421e
NH		 1321}
1322EXPORT_SYMBOL_GPL(sock_update_netprioidx);
f8451725 1323#endif
51e4e7fa 1324#endif
f8451725 1325
1da177e4
LT		 1326/**
1327 * sk_alloc - All socket objects are allocated here
c4ea43c5 1328 * @net: the applicable net namespace
4dc3b16b
PP		 1329 * @family: protocol family
1330 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1331 * @prot: struct proto associated with this new sock instance
1da177e4 1332 */
1b8d7ae4 1333struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1334 struct proto *prot)
1da177e4 1335{
c308c1b2 1336 struct sock *sk;
1da177e4 1337
154adbc8 1338 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1339 if (sk) {
154adbc8
PE		 1340 sk->sk_family = family;
1341 /*
1342 * See comment in struct sock definition to understand
1343 * why we need sk_prot_creator -acme
1344 */
1345 sk->sk_prot = sk->sk_prot_creator = prot;
1346 sock_lock_init(sk);
3b1e0a65 1347 sock_net_set(sk, get_net(net));
d66ee058 1348 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1349
fd9a08a7 1350 sock_update_classid(sk, current);
406a3c63 1351 sock_update_netprioidx(sk, current);
1da177e4 1352 }
a79af59e 1353
2e4afe7b 1354 return sk;
1da177e4 1355}
2a91525c 1356EXPORT_SYMBOL(sk_alloc);
1da177e4 1357
2b85a34e 1358static void __sk_free(struct sock *sk)
1da177e4
LT		 1359{
1360 struct sk_filter *filter;
1da177e4
LT		 1361
1362 if (sk->sk_destruct)
1363 sk->sk_destruct(sk);
1364
a898def2
PM		 1365 filter = rcu_dereference_check(sk->sk_filter,
1366 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1367 if (filter) {
309dd5fc 1368 sk_filter_uncharge(sk, filter);
a9b3cd7f 1369 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1370 }
1371
08e29af3 1372 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1373
1374 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1375 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1376 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1377
109f6e39
EB		 1378 if (sk->sk_peer_cred)
1379 put_cred(sk->sk_peer_cred);
1380 put_pid(sk->sk_peer_pid);
3b1e0a65 1381 put_net(sock_net(sk));
c308c1b2 1382 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1383}
2b85a34e
ED		 1384
1385void sk_free(struct sock *sk)
1386{
1387 /*
25985edc 1388 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1389 * some packets are still in some tx queue.
1390 * If not null, sock_wfree() will call __sk_free(sk) later
1391 */
1392 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1393 __sk_free(sk);
1394}
2a91525c 1395EXPORT_SYMBOL(sk_free);
1da177e4 1396
edf02087 1397/*
25985edc
LDM		 1398 * Last sock_put should drop reference to sk->sk_net. It has already
1399 * been dropped in sk_change_net. Taking reference to stopping namespace
edf02087 1400 * is not an option.
25985edc 1401 * Take reference to a socket to remove it from hash _alive_ and after that
edf02087
DL		 1402 * destroy it in the context of init_net.
1403 */
1404void sk_release_kernel(struct sock *sk)
1405{
1406 if (sk == NULL || sk->sk_socket == NULL)
1407 return;
1408
1409 sock_hold(sk);
1410 sock_release(sk->sk_socket);
65a18ec5 1411 release_net(sock_net(sk));
3b1e0a65 1412 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1413 sock_put(sk);
1414}
45af1754 1415EXPORT_SYMBOL(sk_release_kernel);
edf02087 1416
475f1b52
SR		 1417static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1418{
1419 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1420 sock_update_memcg(newsk);
1421}
1422
e56c57d0
ED		 1423/**
1424 * sk_clone_lock - clone a socket, and lock its clone
1425 * @sk: the socket to clone
1426 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1427 *
1428 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1429 */
1430struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1431{
8fd1d178 1432 struct sock *newsk;
87d11ceb 1433
8fd1d178 1434 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1435 if (newsk != NULL) {
1436 struct sk_filter *filter;
1437
892c141e 1438 sock_copy(newsk, sk);
87d11ceb
ACM		 1439
1440 /* SANITY */
3b1e0a65 1441 get_net(sock_net(newsk));
87d11ceb
ACM		 1442 sk_node_init(&newsk->sk_node);
1443 sock_lock_init(newsk);
1444 bh_lock_sock(newsk);
fa438ccf 1445 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1446 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1447
1448 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1449 /*
1450 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1451 */
1452 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1453 atomic_set(&newsk->sk_omem_alloc, 0);
1454 skb_queue_head_init(&newsk->sk_receive_queue);
1455 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1456#ifdef CONFIG_NET_DMA
1457 skb_queue_head_init(&newsk->sk_async_wait_queue);
1458#endif
87d11ceb 1459
b6c6712a 1460 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1461 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1462 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1463 af_callback_keys + newsk->sk_family,
1464 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1465
1466 newsk->sk_dst_cache = NULL;
1467 newsk->sk_wmem_queued = 0;
1468 newsk->sk_forward_alloc = 0;
1469 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1470 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1471
1472 sock_reset_flag(newsk, SOCK_DONE);
1473 skb_queue_head_init(&newsk->sk_error_queue);
1474
0d7da9dd 1475 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb
ACM		 1476 if (filter != NULL)
1477 sk_filter_charge(newsk, filter);
1478
1479 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1480 /* It is still raw copy of parent, so invalidate
1481 * destructor and make plain sk_free() */
1482 newsk->sk_destruct = NULL;
b0691c8e 1483 bh_unlock_sock(newsk);
87d11ceb
ACM		 1484 sk_free(newsk);
1485 newsk = NULL;
1486 goto out;
1487 }
1488
1489 newsk->sk_err = 0;
1490 newsk->sk_priority = 0;
4dc6dc71
ED		 1491 /*
1492 * Before updating sk_refcnt, we must commit prior changes to memory
1493 * (Documentation/RCU/rculist_nulls.txt for details)
1494 */
1495 smp_wmb();
87d11ceb
ACM		 1496 atomic_set(&newsk->sk_refcnt, 2);
1497
1498 /*
1499 * Increment the counter in the same struct proto as the master
1500 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1501 * is the same as sk->sk_prot->socks, as this field was copied
1502 * with memcpy).
1503 *
1504 * This _changes_ the previous behaviour, where
1505 * tcp_create_openreq_child always was incrementing the
1506 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1507 * to be taken into account in all callers. -acme
1508 */
1509 sk_refcnt_debug_inc(newsk);
972692e0 1510 sk_set_socket(newsk, NULL);
43815482 1511 newsk->sk_wq = NULL;
87d11ceb 1512
f3f511e1
GC		 1513 sk_update_clone(sk, newsk);
1514
87d11ceb 1515 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1516 sk_sockets_allocated_inc(newsk);
704da560 1517
08e29af3 1518 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1519 net_enable_timestamp();
87d11ceb
ACM		 1520 }
1521out:
1522 return newsk;
1523}
e56c57d0 1524EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1525
9958089a
AK		 1526void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1527{
1528 __sk_dst_set(sk, dst);
1529 sk->sk_route_caps = dst->dev->features;
1530 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1531 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1532 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1533 if (sk_can_gso(sk)) {
82cc1a7a 1534 if (dst->header_len) {
9958089a 1535 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1536 } else {
9958089a 1537 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1538 sk->sk_gso_max_size = dst->dev->gso_max_size;
1485348d 1539 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
82cc1a7a 1540 }
9958089a
AK		 1541 }
1542}
1543EXPORT_SYMBOL_GPL(sk_setup_caps);
1544
1da177e4
LT		 1545/*
1546 * Simple resource managers for sockets.
1547 */
1548
1549
4ec93edb
YH		 1550/*
1551 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1552 */
1553void sock_wfree(struct sk_buff *skb)
1554{
1555 struct sock *sk = skb->sk;
d99927f4 1556 unsigned int len = skb->truesize;
1da177e4 1557
d99927f4
ED		 1558 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1559 /*
1560 * Keep a reference on sk_wmem_alloc, this will be released
1561 * after sk_write_space() call
1562 */
1563 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1564 sk->sk_write_space(sk);
d99927f4
ED		 1565 len = 1;
1566 }
2b85a34e 1567 /*
d99927f4
ED		 1568 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1569 * could not do because of in-flight packets
2b85a34e 1570 */
d99927f4 1571 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1572 __sk_free(sk);
1da177e4 1573}
2a91525c 1574EXPORT_SYMBOL(sock_wfree);
1da177e4 1575
4ec93edb
YH		 1576/*
1577 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1578 */
1579void sock_rfree(struct sk_buff *skb)
1580{
1581 struct sock *sk = skb->sk;
d361fd59 1582 unsigned int len = skb->truesize;
1da177e4 1583
d361fd59
ED		 1584 atomic_sub(len, &sk->sk_rmem_alloc);
1585 sk_mem_uncharge(sk, len);
1da177e4 1586}
2a91525c 1587EXPORT_SYMBOL(sock_rfree);
1da177e4 1588
41063e9d
DM		 1589void sock_edemux(struct sk_buff *skb)
1590{
e812347c
ED		 1591 struct sock *sk = skb->sk;
1592
1c463e57 1593#ifdef CONFIG_INET
e812347c
ED		 1594 if (sk->sk_state == TCP_TIME_WAIT)
1595 inet_twsk_put(inet_twsk(sk));
1596 else
1c463e57 1597#endif
e812347c 1598 sock_put(sk);
41063e9d
DM		 1599}
1600EXPORT_SYMBOL(sock_edemux);
1da177e4 1601
976d0201 1602kuid_t sock_i_uid(struct sock *sk)
1da177e4 1603{
976d0201 1604 kuid_t uid;
1da177e4 1605
f064af1e 1606 read_lock_bh(&sk->sk_callback_lock);
976d0201 1607 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1608 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1609 return uid;
1610}
2a91525c 1611EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1612
1613unsigned long sock_i_ino(struct sock *sk)
1614{
1615 unsigned long ino;
1616
f064af1e 1617 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1618 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1619 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1620 return ino;
1621}
2a91525c 1622EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1623
1624/*
1625 * Allocate a skb from the socket's send buffer.
1626 */
86a76caf 1627struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1628 gfp_t priority)
1da177e4
LT		 1629{
1630 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1631 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1632 if (skb) {
1633 skb_set_owner_w(skb, sk);
1634 return skb;
1635 }
1636 }
1637 return NULL;
1638}
2a91525c 1639EXPORT_SYMBOL(sock_wmalloc);
1da177e4
LT		 1640
1641/*
1642 * Allocate a skb from the socket's receive buffer.
4ec93edb 1643 */
86a76caf 1644struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1645 gfp_t priority)
1da177e4
LT		 1646{
1647 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1648 struct sk_buff *skb = alloc_skb(size, priority);
1649 if (skb) {
1650 skb_set_owner_r(skb, sk);
1651 return skb;
1652 }
1653 }
1654 return NULL;
1655}
1656
4ec93edb 1657/*
1da177e4 1658 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1659 */
dd0fc66f 1660void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1661{
95c96174 1662 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1663 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1664 void *mem;
1665 /* First do the add, to avoid the race if kmalloc
4ec93edb 1666 * might sleep.
1da177e4
LT		 1667 */
1668 atomic_add(size, &sk->sk_omem_alloc);
1669 mem = kmalloc(size, priority);
1670 if (mem)
1671 return mem;
1672 atomic_sub(size, &sk->sk_omem_alloc);
1673 }
1674 return NULL;
1675}
2a91525c 1676EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1677
1678/*
1679 * Free an option memory block.
1680 */
1681void sock_kfree_s(struct sock *sk, void *mem, int size)
1682{
1683 kfree(mem);
1684 atomic_sub(size, &sk->sk_omem_alloc);
1685}
2a91525c 1686EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1687
1688/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1689 I think, these locks should be removed for datagram sockets.
1690 */
2a91525c 1691static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1692{
1693 DEFINE_WAIT(wait);
1694
1695 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1696 for (;;) {
1697 if (!timeo)
1698 break;
1699 if (signal_pending(current))
1700 break;
1701 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1702 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1703 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1704 break;
1705 if (sk->sk_shutdown & SEND_SHUTDOWN)
1706 break;
1707 if (sk->sk_err)
1708 break;
1709 timeo = schedule_timeout(timeo);
1710 }
aa395145 1711 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1712 return timeo;
1713}
1714
1715
1716/*
1717 * Generic send/receive buffer handlers
1718 */
1719
4cc7f68d
HX		 1720struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1721 unsigned long data_len, int noblock,
1722 int *errcode)
1da177e4
LT		 1723{
1724 struct sk_buff *skb;
7d877f3b 1725 gfp_t gfp_mask;
1da177e4
LT		 1726 long timeo;
1727 int err;
cc9b17ad
JW		 1728 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1729
1730 err = -EMSGSIZE;
1731 if (npages > MAX_SKB_FRAGS)
1732 goto failure;
1da177e4
LT		 1733
1734 gfp_mask = sk->sk_allocation;
1735 if (gfp_mask & __GFP_WAIT)
1736 gfp_mask |= __GFP_REPEAT;
1737
1738 timeo = sock_sndtimeo(sk, noblock);
1739 while (1) {
1740 err = sock_error(sk);
1741 if (err != 0)
1742 goto failure;
1743
1744 err = -EPIPE;
1745 if (sk->sk_shutdown & SEND_SHUTDOWN)
1746 goto failure;
1747
1748 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1749 skb = alloc_skb(header_len, gfp_mask);
1da177e4 1750 if (skb) {
1da177e4
LT		 1751 int i;
1752
1753 /* No pages, we're done... */
1754 if (!data_len)
1755 break;
1756
1da177e4
LT		 1757 skb->truesize += data_len;
1758 skb_shinfo(skb)->nr_frags = npages;
1759 for (i = 0; i < npages; i++) {
1760 struct page *page;
1da177e4
LT		 1761
1762 page = alloc_pages(sk->sk_allocation, 0);
1763 if (!page) {
1764 err = -ENOBUFS;
1765 skb_shinfo(skb)->nr_frags = i;
1766 kfree_skb(skb);
1767 goto failure;
1768 }
1769
ea2ab693
IC		 1770 __skb_fill_page_desc(skb, i,
1771 page, 0,
1772 (data_len >= PAGE_SIZE ?
1773 PAGE_SIZE :
1774 data_len));
1da177e4
LT		 1775 data_len -= PAGE_SIZE;
1776 }
1777
1778 /* Full success... */
1779 break;
1780 }
1781 err = -ENOBUFS;
1782 goto failure;
1783 }
1784 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1785 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1786 err = -EAGAIN;
1787 if (!timeo)
1788 goto failure;
1789 if (signal_pending(current))
1790 goto interrupted;
1791 timeo = sock_wait_for_wmem(sk, timeo);
1792 }
1793
1794 skb_set_owner_w(skb, sk);
1795 return skb;
1796
1797interrupted:
1798 err = sock_intr_errno(timeo);
1799failure:
1800 *errcode = err;
1801 return NULL;
1802}
4cc7f68d 1803EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1804
4ec93edb 1805struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1806 int noblock, int *errcode)
1807{
1808 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1809}
2a91525c 1810EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1811
5640f768
ED		 1812/* On 32bit arches, an skb frag is limited to 2^15 */
1813#define SKB_FRAG_PAGE_ORDER get_order(32768)
1814
1815bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1816{
1817 int order;
1818
1819 if (pfrag->page) {
1820 if (atomic_read(&pfrag->page->_count) == 1) {
1821 pfrag->offset = 0;
1822 return true;
1823 }
1824 if (pfrag->offset < pfrag->size)
1825 return true;
1826 put_page(pfrag->page);
1827 }
1828
1829 /* We restrict high order allocations to users that can afford to wait */
1830 order = (sk->sk_allocation & __GFP_WAIT) ? SKB_FRAG_PAGE_ORDER : 0;
1831
1832 do {
1833 gfp_t gfp = sk->sk_allocation;
1834
1835 if (order)
1836 gfp |= __GFP_COMP | __GFP_NOWARN;
1837 pfrag->page = alloc_pages(gfp, order);
1838 if (likely(pfrag->page)) {
1839 pfrag->offset = 0;
1840 pfrag->size = PAGE_SIZE << order;
1841 return true;
1842 }
1843 } while (--order >= 0);
1844
1845 sk_enter_memory_pressure(sk);
1846 sk_stream_moderate_sndbuf(sk);
1847 return false;
1848}
1849EXPORT_SYMBOL(sk_page_frag_refill);
1850
1da177e4 1851static void __lock_sock(struct sock *sk)
f39234d6
NK		 1852 __releases(&sk->sk_lock.slock)
1853 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1854{
1855 DEFINE_WAIT(wait);
1856
e71a4783 1857 for (;;) {
1da177e4
LT		 1858 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1859 TASK_UNINTERRUPTIBLE);
1860 spin_unlock_bh(&sk->sk_lock.slock);
1861 schedule();
1862 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1863 if (!sock_owned_by_user(sk))
1da177e4
LT		 1864 break;
1865 }
1866 finish_wait(&sk->sk_lock.wq, &wait);
1867}
1868
1869static void __release_sock(struct sock *sk)
f39234d6
NK		 1870 __releases(&sk->sk_lock.slock)
1871 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1872{
1873 struct sk_buff *skb = sk->sk_backlog.head;
1874
1875 do {
1876 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1877 bh_unlock_sock(sk);
1878
1879 do {
1880 struct sk_buff *next = skb->next;
1881
e4cbb02a 1882 prefetch(next);
7fee226a 1883 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1884 skb->next = NULL;
c57943a1 1885 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1886
1887 /*
1888 * We are in process context here with softirqs
1889 * disabled, use cond_resched_softirq() to preempt.
1890 * This is safe to do because we've taken the backlog
1891 * queue private:
1892 */
1893 cond_resched_softirq();
1894
1895 skb = next;
1896 } while (skb != NULL);
1897
1898 bh_lock_sock(sk);
e71a4783 1899 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1900
1901 /*
1902 * Doing the zeroing here guarantee we can not loop forever
1903 * while a wild producer attempts to flood us.
1904 */
1905 sk->sk_backlog.len = 0;
1da177e4
LT		 1906}
1907
1908/**
1909 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1910 * @sk: sock to wait on
1911 * @timeo: for how long
1da177e4
LT		 1912 *
1913 * Now socket state including sk->sk_err is changed only under lock,
1914 * hence we may omit checks after joining wait queue.
1915 * We check receive queue before schedule() only as optimization;
1916 * it is very likely that release_sock() added new data.
1917 */
1918int sk_wait_data(struct sock *sk, long *timeo)
1919{
1920 int rc;
1921 DEFINE_WAIT(wait);
1922
aa395145 1923 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1924 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1925 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1926 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1927 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1928 return rc;
1929}
1da177e4
LT		 1930EXPORT_SYMBOL(sk_wait_data);
1931
3ab224be
HA		 1932/**
1933 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1934 * @sk: socket
1935 * @size: memory size to allocate
1936 * @kind: allocation type
1937 *
1938 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1939 * rmem allocation. This function assumes that protocols which have
1940 * memory_pressure use sk_wmem_queued as write buffer accounting.
1941 */
1942int __sk_mem_schedule(struct sock *sk, int size, int kind)
1943{
1944 struct proto *prot = sk->sk_prot;
1945 int amt = sk_mem_pages(size);
8d987e5c 1946 long allocated;
e1aab161 1947 int parent_status = UNDER_LIMIT;
3ab224be
HA		 1948
1949 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 1950
e1aab161 1951 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 1952
1953 /* Under limit. */
e1aab161
GC		 1954 if (parent_status == UNDER_LIMIT &&
1955 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 1956 sk_leave_memory_pressure(sk);
3ab224be
HA		 1957 return 1;
1958 }
1959
e1aab161
GC		 1960 /* Under pressure. (we or our parents) */
1961 if ((parent_status > SOFT_LIMIT) ||
1962 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 1963 sk_enter_memory_pressure(sk);
3ab224be 1964
e1aab161
GC		 1965 /* Over hard limit (we or our parents) */
1966 if ((parent_status == OVER_LIMIT) ||
1967 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 1968 goto suppress_allocation;
1969
1970 /* guarantee minimum buffer size under pressure */
1971 if (kind == SK_MEM_RECV) {
1972 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1973 return 1;
180d8cd9 1974
3ab224be
HA		 1975 } else { /* SK_MEM_SEND */
1976 if (sk->sk_type == SOCK_STREAM) {
1977 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1978 return 1;
1979 } else if (atomic_read(&sk->sk_wmem_alloc) <
1980 prot->sysctl_wmem[0])
1981 return 1;
1982 }
1983
180d8cd9 1984 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 1985 int alloc;
1986
180d8cd9 1987 if (!sk_under_memory_pressure(sk))
1748376b 1988 return 1;
180d8cd9
GC		 1989 alloc = sk_sockets_allocated_read_positive(sk);
1990 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 1991 sk_mem_pages(sk->sk_wmem_queued +
1992 atomic_read(&sk->sk_rmem_alloc) +
1993 sk->sk_forward_alloc))
1994 return 1;
1995 }
1996
1997suppress_allocation:
1998
1999 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2000 sk_stream_moderate_sndbuf(sk);
2001
2002 /* Fail only if socket is _under_ its sndbuf.
2003 * In this case we cannot block, so that we have to fail.
2004 */
2005 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2006 return 1;
2007 }
2008
3847ce32
SM		 2009 trace_sock_exceed_buf_limit(sk, prot, allocated);
2010
3ab224be
HA		 2011 /* Alas. Undo changes. */
2012 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2013
0e90b31f 2014 sk_memory_allocated_sub(sk, amt);
180d8cd9 2015
3ab224be
HA		 2016 return 0;
2017}
3ab224be
HA		 2018EXPORT_SYMBOL(__sk_mem_schedule);
2019
2020/**
2021 * __sk_reclaim - reclaim memory_allocated
2022 * @sk: socket
2023 */
2024void __sk_mem_reclaim(struct sock *sk)
2025{
180d8cd9 2026 sk_memory_allocated_sub(sk,
0e90b31f 2027 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
3ab224be
HA		 2028 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
2029
180d8cd9
GC		 2030 if (sk_under_memory_pressure(sk) &&
2031 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2032 sk_leave_memory_pressure(sk);
3ab224be 2033}
3ab224be
HA		 2034EXPORT_SYMBOL(__sk_mem_reclaim);
2035
2036
1da177e4
LT		 2037/*
2038 * Set of default routines for initialising struct proto_ops when
2039 * the protocol does not support a particular function. In certain
2040 * cases where it makes no sense for a protocol to have a "do nothing"
2041 * function, some default processing is provided.
2042 */
2043
2044int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2045{
2046 return -EOPNOTSUPP;
2047}
2a91525c 2048EXPORT_SYMBOL(sock_no_bind);
1da177e4 2049
4ec93edb 2050int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2051 int len, int flags)
2052{
2053 return -EOPNOTSUPP;
2054}
2a91525c 2055EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2056
2057int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2058{
2059 return -EOPNOTSUPP;
2060}
2a91525c 2061EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2062
2063int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2064{
2065 return -EOPNOTSUPP;
2066}
2a91525c 2067EXPORT_SYMBOL(sock_no_accept);
1da177e4 2068
4ec93edb 2069int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2070 int *len, int peer)
2071{
2072 return -EOPNOTSUPP;
2073}
2a91525c 2074EXPORT_SYMBOL(sock_no_getname);
1da177e4 2075
2a91525c 2076unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2077{
2078 return 0;
2079}
2a91525c 2080EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2081
2082int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2083{
2084 return -EOPNOTSUPP;
2085}
2a91525c 2086EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2087
2088int sock_no_listen(struct socket *sock, int backlog)
2089{
2090 return -EOPNOTSUPP;
2091}
2a91525c 2092EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2093
2094int sock_no_shutdown(struct socket *sock, int how)
2095{
2096 return -EOPNOTSUPP;
2097}
2a91525c 2098EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2099
2100int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2101 char __user *optval, unsigned int optlen)
1da177e4
LT		 2102{
2103 return -EOPNOTSUPP;
2104}
2a91525c 2105EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2106
2107int sock_no_getsockopt(struct socket *sock, int level, int optname,
2108 char __user *optval, int __user *optlen)
2109{
2110 return -EOPNOTSUPP;
2111}
2a91525c 2112EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 2113
2114int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2115 size_t len)
2116{
2117 return -EOPNOTSUPP;
2118}
2a91525c 2119EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 2120
2121int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2122 size_t len, int flags)
2123{
2124 return -EOPNOTSUPP;
2125}
2a91525c 2126EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2127
2128int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2129{
2130 /* Mirror missing mmap method error code */
2131 return -ENODEV;
2132}
2a91525c 2133EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2134
2135ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2136{
2137 ssize_t res;
2138 struct msghdr msg = {.msg_flags = flags};
2139 struct kvec iov;
2140 char *kaddr = kmap(page);
2141 iov.iov_base = kaddr + offset;
2142 iov.iov_len = size;
2143 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2144 kunmap(page);
2145 return res;
2146}
2a91525c 2147EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2148
2149/*
2150 * Default Socket Callbacks
2151 */
2152
2153static void sock_def_wakeup(struct sock *sk)
2154{
43815482
ED		 2155 struct socket_wq *wq;
2156
2157 rcu_read_lock();
2158 wq = rcu_dereference(sk->sk_wq);
2159 if (wq_has_sleeper(wq))
2160 wake_up_interruptible_all(&wq->wait);
2161 rcu_read_unlock();
1da177e4
LT		 2162}
2163
2164static void sock_def_error_report(struct sock *sk)
2165{
43815482
ED		 2166 struct socket_wq *wq;
2167
2168 rcu_read_lock();
2169 wq = rcu_dereference(sk->sk_wq);
2170 if (wq_has_sleeper(wq))
2171 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2172 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2173 rcu_read_unlock();
1da177e4
LT		 2174}
2175
2176static void sock_def_readable(struct sock *sk, int len)
2177{
43815482
ED		 2178 struct socket_wq *wq;
2179
2180 rcu_read_lock();
2181 wq = rcu_dereference(sk->sk_wq);
2182 if (wq_has_sleeper(wq))
2c6607c6 2183 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2184 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2185 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2186 rcu_read_unlock();
1da177e4
LT		 2187}
2188
2189static void sock_def_write_space(struct sock *sk)
2190{
43815482
ED		 2191 struct socket_wq *wq;
2192
2193 rcu_read_lock();
1da177e4
LT		 2194
2195 /* Do not wake up a writer until he can make "significant"
2196 * progress. --DaveM
2197 */
e71a4783 2198 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2199 wq = rcu_dereference(sk->sk_wq);
2200 if (wq_has_sleeper(wq))
2201 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2202 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2203
2204 /* Should agree with poll, otherwise some programs break */
2205 if (sock_writeable(sk))
8d8ad9d7 2206 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2207 }
2208
43815482 2209 rcu_read_unlock();
1da177e4
LT		 2210}
2211
2212static void sock_def_destruct(struct sock *sk)
2213{
a51482bd 2214 kfree(sk->sk_protinfo);
1da177e4
LT		 2215}
2216
2217void sk_send_sigurg(struct sock *sk)
2218{
2219 if (sk->sk_socket && sk->sk_socket->file)
2220 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2221 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2222}
2a91525c 2223EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2224
2225void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2226 unsigned long expires)
2227{
2228 if (!mod_timer(timer, expires))
2229 sock_hold(sk);
2230}
1da177e4
LT		 2231EXPORT_SYMBOL(sk_reset_timer);
2232
2233void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2234{
25cc4ae9 2235 if (del_timer(timer))
1da177e4
LT		 2236 __sock_put(sk);
2237}
1da177e4
LT		 2238EXPORT_SYMBOL(sk_stop_timer);
2239
2240void sock_init_data(struct socket *sock, struct sock *sk)
2241{
2242 skb_queue_head_init(&sk->sk_receive_queue);
2243 skb_queue_head_init(&sk->sk_write_queue);
2244 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 2245#ifdef CONFIG_NET_DMA
2246 skb_queue_head_init(&sk->sk_async_wait_queue);
2247#endif
1da177e4
LT		 2248
2249 sk->sk_send_head = NULL;
2250
2251 init_timer(&sk->sk_timer);
4ec93edb 2252
1da177e4
LT		 2253 sk->sk_allocation = GFP_KERNEL;
2254 sk->sk_rcvbuf = sysctl_rmem_default;
2255 sk->sk_sndbuf = sysctl_wmem_default;
2256 sk->sk_state = TCP_CLOSE;
972692e0 2257 sk_set_socket(sk, sock);
1da177e4
LT		 2258
2259 sock_set_flag(sk, SOCK_ZAPPED);
2260
e71a4783 2261 if (sock) {
1da177e4 2262 sk->sk_type = sock->type;
43815482 2263 sk->sk_wq = sock->wq;
1da177e4
LT		 2264 sock->sk = sk;
2265 } else
43815482 2266 sk->sk_wq = NULL;
1da177e4 2267
b6c6712a 2268 spin_lock_init(&sk->sk_dst_lock);
1da177e4 2269 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2270 lockdep_set_class_and_name(&sk->sk_callback_lock,
2271 af_callback_keys + sk->sk_family,
2272 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2273
2274 sk->sk_state_change = sock_def_wakeup;
2275 sk->sk_data_ready = sock_def_readable;
2276 sk->sk_write_space = sock_def_write_space;
2277 sk->sk_error_report = sock_def_error_report;
2278 sk->sk_destruct = sock_def_destruct;
2279
5640f768
ED		 2280 sk->sk_frag.page = NULL;
2281 sk->sk_frag.offset = 0;
ef64a54f 2282 sk->sk_peek_off = -1;
1da177e4 2283
109f6e39
EB		 2284 sk->sk_peer_pid = NULL;
2285 sk->sk_peer_cred = NULL;
1da177e4
LT		 2286 sk->sk_write_pending = 0;
2287 sk->sk_rcvlowat = 1;
2288 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2289 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2290
f37f0afb 2291 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 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 */
ubuntu-zesty-kernel mirror