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