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net: guard tcp_set_keepalive() to tcp sockets
[mirror_ubuntu-artful-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
5bc1421e
NH		 329#if defined(CONFIG_CGROUPS)
330#if !defined(CONFIG_NET_CLS_CGROUP)
f8451725
HX		 331int net_cls_subsys_id = -1;
332EXPORT_SYMBOL_GPL(net_cls_subsys_id);
333#endif
5bc1421e
NH		 334#if !defined(CONFIG_NETPRIO_CGROUP)
335int net_prio_subsys_id = -1;
336EXPORT_SYMBOL_GPL(net_prio_subsys_id);
337#endif
338#endif
f8451725 339
1da177e4
LT		 340static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
341{
342 struct timeval tv;
343
344 if (optlen < sizeof(tv))
345 return -EINVAL;
346 if (copy_from_user(&tv, optval, sizeof(tv)))
347 return -EFAULT;
ba78073e
VA		 348 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
349 return -EDOM;
1da177e4 350
ba78073e 351 if (tv.tv_sec < 0) {
6f11df83
AM		 352 static int warned __read_mostly;
353
ba78073e 354 *timeo_p = 0;
50aab54f 355 if (warned < 10 && net_ratelimit()) {
ba78073e 356 warned++;
e005d193
JP		 357 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
358 __func__, current->comm, task_pid_nr(current));
50aab54f 359 }
ba78073e
VA		 360 return 0;
361 }
1da177e4
LT		 362 *timeo_p = MAX_SCHEDULE_TIMEOUT;
363 if (tv.tv_sec == 0 && tv.tv_usec == 0)
364 return 0;
365 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
366 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
367 return 0;
368}
369
370static void sock_warn_obsolete_bsdism(const char *name)
371{
372 static int warned;
373 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 374 if (strcmp(warncomm, current->comm) && warned < 5) {
375 strcpy(warncomm, current->comm);
e005d193
JP		 376 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
377 warncomm, name);
1da177e4
LT		 378 warned++;
379 }
380}
381
08e29af3
ED		 382#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
383
384static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 385{
08e29af3
ED		 386 if (sk->sk_flags & flags) {
387 sk->sk_flags &= ~flags;
388 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 389 net_disable_timestamp();
1da177e4
LT		 390 }
391}
392
393
f0088a50
DV		 394int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
395{
766e9037 396 int err;
f0088a50 397 int skb_len;
3b885787
NH		 398 unsigned long flags;
399 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 400
0fd7bac6 401 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 402 atomic_inc(&sk->sk_drops);
3847ce32 403 trace_sock_rcvqueue_full(sk, skb);
766e9037 404 return -ENOMEM;
f0088a50
DV		 405 }
406
fda9ef5d 407 err = sk_filter(sk, skb);
f0088a50 408 if (err)
766e9037 409 return err;
f0088a50 410
c76562b6 411 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 412 atomic_inc(&sk->sk_drops);
413 return -ENOBUFS;
3ab224be
HA		 414 }
415
f0088a50
DV		 416 skb->dev = NULL;
417 skb_set_owner_r(skb, sk);
49ad9599 418
f0088a50
DV		 419 /* Cache the SKB length before we tack it onto the receive
420 * queue. Once it is added it no longer belongs to us and
421 * may be freed by other threads of control pulling packets
422 * from the queue.
423 */
424 skb_len = skb->len;
425
7fee226a
ED		 426 /* we escape from rcu protected region, make sure we dont leak
427 * a norefcounted dst
428 */
429 skb_dst_force(skb);
430
3b885787
NH		 431 spin_lock_irqsave(&list->lock, flags);
432 skb->dropcount = atomic_read(&sk->sk_drops);
433 __skb_queue_tail(list, skb);
434 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 435
436 if (!sock_flag(sk, SOCK_DEAD))
437 sk->sk_data_ready(sk, skb_len);
766e9037 438 return 0;
f0088a50
DV		 439}
440EXPORT_SYMBOL(sock_queue_rcv_skb);
441
58a5a7b9 442int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 443{
444 int rc = NET_RX_SUCCESS;
445
fda9ef5d 446 if (sk_filter(sk, skb))
f0088a50
DV		 447 goto discard_and_relse;
448
449 skb->dev = NULL;
450
f545a38f 451 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) {
c377411f
ED		 452 atomic_inc(&sk->sk_drops);
453 goto discard_and_relse;
454 }
58a5a7b9
ACM		 455 if (nested)
456 bh_lock_sock_nested(sk);
457 else
458 bh_lock_sock(sk);
a5b5bb9a
IM		 459 if (!sock_owned_by_user(sk)) {
460 /*
461 * trylock + unlock semantics:
462 */
463 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
464
c57943a1 465 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 466
467 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 468 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 469 bh_unlock_sock(sk);
470 atomic_inc(&sk->sk_drops);
471 goto discard_and_relse;
472 }
473
f0088a50
DV		 474 bh_unlock_sock(sk);
475out:
476 sock_put(sk);
477 return rc;
478discard_and_relse:
479 kfree_skb(skb);
480 goto out;
481}
482EXPORT_SYMBOL(sk_receive_skb);
483
ea94ff3b
KK		 484void sk_reset_txq(struct sock *sk)
485{
486 sk_tx_queue_clear(sk);
487}
488EXPORT_SYMBOL(sk_reset_txq);
489
f0088a50
DV		 490struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
491{
b6c6712a 492 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 493
494 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 495 sk_tx_queue_clear(sk);
a9b3cd7f 496 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 497 dst_release(dst);
498 return NULL;
499 }
500
501 return dst;
502}
503EXPORT_SYMBOL(__sk_dst_check);
504
505struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
506{
507 struct dst_entry *dst = sk_dst_get(sk);
508
509 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
510 sk_dst_reset(sk);
511 dst_release(dst);
512 return NULL;
513 }
514
515 return dst;
516}
517EXPORT_SYMBOL(sk_dst_check);
518
4878809f
DM		 519static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
520{
521 int ret = -ENOPROTOOPT;
522#ifdef CONFIG_NETDEVICES
3b1e0a65 523 struct net *net = sock_net(sk);
4878809f
DM		 524 char devname[IFNAMSIZ];
525 int index;
526
527 /* Sorry... */
528 ret = -EPERM;
529 if (!capable(CAP_NET_RAW))
530 goto out;
531
532 ret = -EINVAL;
533 if (optlen < 0)
534 goto out;
535
536 /* Bind this socket to a particular device like "eth0",
537 * as specified in the passed interface name. If the
538 * name is "" or the option length is zero the socket
539 * is not bound.
540 */
541 if (optlen > IFNAMSIZ - 1)
542 optlen = IFNAMSIZ - 1;
543 memset(devname, 0, sizeof(devname));
544
545 ret = -EFAULT;
546 if (copy_from_user(devname, optval, optlen))
547 goto out;
548
000ba2e4
DM		 549 index = 0;
550 if (devname[0] != '\0') {
bf8e56bf 551 struct net_device *dev;
4878809f 552
bf8e56bf
ED		 553 rcu_read_lock();
554 dev = dev_get_by_name_rcu(net, devname);
555 if (dev)
556 index = dev->ifindex;
557 rcu_read_unlock();
4878809f
DM		 558 ret = -ENODEV;
559 if (!dev)
560 goto out;
4878809f
DM		 561 }
562
563 lock_sock(sk);
564 sk->sk_bound_dev_if = index;
565 sk_dst_reset(sk);
566 release_sock(sk);
567
568 ret = 0;
569
570out:
571#endif
572
573 return ret;
574}
575
c0ef877b
PE		 576static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
577{
578 if (valbool)
579 sock_set_flag(sk, bit);
580 else
581 sock_reset_flag(sk, bit);
582}
583
1da177e4
LT		 584/*
585 * This is meant for all protocols to use and covers goings on
586 * at the socket level. Everything here is generic.
587 */
588
589int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 590 char __user *optval, unsigned int optlen)
1da177e4 591{
2a91525c 592 struct sock *sk = sock->sk;
1da177e4
LT		 593 int val;
594 int valbool;
595 struct linger ling;
596 int ret = 0;
4ec93edb 597
1da177e4
LT		 598 /*
599 * Options without arguments
600 */
601
4878809f
DM		 602 if (optname == SO_BINDTODEVICE)
603 return sock_bindtodevice(sk, optval, optlen);
604
e71a4783
SH		 605 if (optlen < sizeof(int))
606 return -EINVAL;
4ec93edb 607
1da177e4
LT		 608 if (get_user(val, (int __user *)optval))
609 return -EFAULT;
4ec93edb 610
2a91525c 611 valbool = val ? 1 : 0;
1da177e4
LT		 612
613 lock_sock(sk);
614
2a91525c 615 switch (optname) {
e71a4783 616 case SO_DEBUG:
2a91525c 617 if (val && !capable(CAP_NET_ADMIN))
e71a4783 618 ret = -EACCES;
2a91525c 619 else
c0ef877b 620 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 621 break;
622 case SO_REUSEADDR:
4a17fd52 623 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783
SH		 624 break;
625 case SO_TYPE:
49c794e9 626 case SO_PROTOCOL:
0d6038ee 627 case SO_DOMAIN:
e71a4783
SH		 628 case SO_ERROR:
629 ret = -ENOPROTOOPT;
630 break;
631 case SO_DONTROUTE:
c0ef877b 632 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 633 break;
634 case SO_BROADCAST:
635 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
636 break;
637 case SO_SNDBUF:
638 /* Don't error on this BSD doesn't and if you think
82981930
ED		 639 * about it this is right. Otherwise apps have to
640 * play 'guess the biggest size' games. RCVBUF/SNDBUF
641 * are treated in BSD as hints
642 */
643 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 644set_sndbuf:
e71a4783 645 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 646 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
647 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 648 sk->sk_write_space(sk);
649 break;
1da177e4 650
e71a4783
SH		 651 case SO_SNDBUFFORCE:
652 if (!capable(CAP_NET_ADMIN)) {
653 ret = -EPERM;
654 break;
655 }
656 goto set_sndbuf;
b0573dea 657
e71a4783
SH		 658 case SO_RCVBUF:
659 /* Don't error on this BSD doesn't and if you think
82981930
ED		 660 * about it this is right. Otherwise apps have to
661 * play 'guess the biggest size' games. RCVBUF/SNDBUF
662 * are treated in BSD as hints
663 */
664 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 665set_rcvbuf:
e71a4783
SH		 666 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
667 /*
668 * We double it on the way in to account for
669 * "struct sk_buff" etc. overhead. Applications
670 * assume that the SO_RCVBUF setting they make will
671 * allow that much actual data to be received on that
672 * socket.
673 *
674 * Applications are unaware that "struct sk_buff" and
675 * other overheads allocate from the receive buffer
676 * during socket buffer allocation.
677 *
678 * And after considering the possible alternatives,
679 * returning the value we actually used in getsockopt
680 * is the most desirable behavior.
681 */
82981930 682 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 683 break;
684
685 case SO_RCVBUFFORCE:
686 if (!capable(CAP_NET_ADMIN)) {
687 ret = -EPERM;
1da177e4 688 break;
e71a4783
SH		 689 }
690 goto set_rcvbuf;
1da177e4 691
e71a4783 692 case SO_KEEPALIVE:
1da177e4 693#ifdef CONFIG_INET
3e10986d
ED		 694 if (sk->sk_protocol == IPPROTO_TCP &&
695 sk->sk_type == SOCK_STREAM)
e71a4783 696 tcp_set_keepalive(sk, valbool);
1da177e4 697#endif
e71a4783
SH		 698 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
699 break;
700
701 case SO_OOBINLINE:
702 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
703 break;
704
705 case SO_NO_CHECK:
706 sk->sk_no_check = valbool;
707 break;
708
709 case SO_PRIORITY:
710 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
711 sk->sk_priority = val;
712 else
713 ret = -EPERM;
714 break;
715
716 case SO_LINGER:
717 if (optlen < sizeof(ling)) {
718 ret = -EINVAL; /* 1003.1g */
1da177e4 719 break;
e71a4783 720 }
2a91525c 721 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 722 ret = -EFAULT;
1da177e4 723 break;
e71a4783
SH		 724 }
725 if (!ling.l_onoff)
726 sock_reset_flag(sk, SOCK_LINGER);
727 else {
1da177e4 728#if (BITS_PER_LONG == 32)
e71a4783
SH		 729 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
730 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 731 else
e71a4783
SH		 732#endif
733 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
734 sock_set_flag(sk, SOCK_LINGER);
735 }
736 break;
737
738 case SO_BSDCOMPAT:
739 sock_warn_obsolete_bsdism("setsockopt");
740 break;
741
742 case SO_PASSCRED:
743 if (valbool)
744 set_bit(SOCK_PASSCRED, &sock->flags);
745 else
746 clear_bit(SOCK_PASSCRED, &sock->flags);
747 break;
748
749 case SO_TIMESTAMP:
92f37fd2 750 case SO_TIMESTAMPNS:
e71a4783 751 if (valbool) {
92f37fd2
ED		 752 if (optname == SO_TIMESTAMP)
753 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
754 else
755 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 756 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 757 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 758 } else {
e71a4783 759 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 760 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
761 }
e71a4783
SH		 762 break;
763
20d49473
PO		 764 case SO_TIMESTAMPING:
765 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 766 ret = -EINVAL;
20d49473
PO		 767 break;
768 }
769 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
770 val & SOF_TIMESTAMPING_TX_HARDWARE);
771 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
772 val & SOF_TIMESTAMPING_TX_SOFTWARE);
773 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
774 val & SOF_TIMESTAMPING_RX_HARDWARE);
775 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
776 sock_enable_timestamp(sk,
777 SOCK_TIMESTAMPING_RX_SOFTWARE);
778 else
779 sock_disable_timestamp(sk,
08e29af3 780 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 781 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
782 val & SOF_TIMESTAMPING_SOFTWARE);
783 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
784 val & SOF_TIMESTAMPING_SYS_HARDWARE);
785 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
786 val & SOF_TIMESTAMPING_RAW_HARDWARE);
787 break;
788
e71a4783
SH		 789 case SO_RCVLOWAT:
790 if (val < 0)
791 val = INT_MAX;
792 sk->sk_rcvlowat = val ? : 1;
793 break;
794
795 case SO_RCVTIMEO:
796 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
797 break;
798
799 case SO_SNDTIMEO:
800 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
801 break;
1da177e4 802
e71a4783
SH		 803 case SO_ATTACH_FILTER:
804 ret = -EINVAL;
805 if (optlen == sizeof(struct sock_fprog)) {
806 struct sock_fprog fprog;
1da177e4 807
e71a4783
SH		 808 ret = -EFAULT;
809 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 810 break;
e71a4783
SH		 811
812 ret = sk_attach_filter(&fprog, sk);
813 }
814 break;
815
816 case SO_DETACH_FILTER:
55b33325 817 ret = sk_detach_filter(sk);
e71a4783 818 break;
1da177e4 819
e71a4783
SH		 820 case SO_PASSSEC:
821 if (valbool)
822 set_bit(SOCK_PASSSEC, &sock->flags);
823 else
824 clear_bit(SOCK_PASSSEC, &sock->flags);
825 break;
4a19ec58
LAT		 826 case SO_MARK:
827 if (!capable(CAP_NET_ADMIN))
828 ret = -EPERM;
2a91525c 829 else
4a19ec58 830 sk->sk_mark = val;
4a19ec58 831 break;
877ce7c1 832
1da177e4
LT		 833 /* We implement the SO_SNDLOWAT etc to
834 not be settable (1003.1g 5.3) */
3b885787 835 case SO_RXQ_OVFL:
8083f0fc 836 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 837 break;
6e3e939f
JB		 838
839 case SO_WIFI_STATUS:
840 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
841 break;
842
ef64a54f
PE		 843 case SO_PEEK_OFF:
844 if (sock->ops->set_peek_off)
845 sock->ops->set_peek_off(sk, val);
846 else
847 ret = -EOPNOTSUPP;
848 break;
3bdc0eba
BG		 849
850 case SO_NOFCS:
851 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
852 break;
853
e71a4783
SH		 854 default:
855 ret = -ENOPROTOOPT;
856 break;
4ec93edb 857 }
1da177e4
LT		 858 release_sock(sk);
859 return ret;
860}
2a91525c 861EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 862
863
3f551f94
EB		 864void cred_to_ucred(struct pid *pid, const struct cred *cred,
865 struct ucred *ucred)
866{
867 ucred->pid = pid_vnr(pid);
868 ucred->uid = ucred->gid = -1;
869 if (cred) {
870 struct user_namespace *current_ns = current_user_ns();
871
76b6db01
EB		 872 ucred->uid = from_kuid(current_ns, cred->euid);
873 ucred->gid = from_kgid(current_ns, cred->egid);
3f551f94
EB		 874 }
875}
3924773a 876EXPORT_SYMBOL_GPL(cred_to_ucred);
3f551f94 877
1da177e4
LT		 878int sock_getsockopt(struct socket *sock, int level, int optname,
879 char __user *optval, int __user *optlen)
880{
881 struct sock *sk = sock->sk;
4ec93edb 882
e71a4783 883 union {
4ec93edb
YH		 884 int val;
885 struct linger ling;
1da177e4
LT		 886 struct timeval tm;
887 } v;
4ec93edb 888
4d0392be 889 int lv = sizeof(int);
1da177e4 890 int len;
4ec93edb 891
e71a4783 892 if (get_user(len, optlen))
4ec93edb 893 return -EFAULT;
e71a4783 894 if (len < 0)
1da177e4 895 return -EINVAL;
4ec93edb 896
50fee1de 897 memset(&v, 0, sizeof(v));
df0bca04 898
2a91525c 899 switch (optname) {
e71a4783
SH		 900 case SO_DEBUG:
901 v.val = sock_flag(sk, SOCK_DBG);
902 break;
903
904 case SO_DONTROUTE:
905 v.val = sock_flag(sk, SOCK_LOCALROUTE);
906 break;
907
908 case SO_BROADCAST:
1b23a5df 909 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 910 break;
911
912 case SO_SNDBUF:
913 v.val = sk->sk_sndbuf;
914 break;
915
916 case SO_RCVBUF:
917 v.val = sk->sk_rcvbuf;
918 break;
919
920 case SO_REUSEADDR:
921 v.val = sk->sk_reuse;
922 break;
923
924 case SO_KEEPALIVE:
1b23a5df 925 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 926 break;
927
928 case SO_TYPE:
929 v.val = sk->sk_type;
930 break;
931
49c794e9
JE		 932 case SO_PROTOCOL:
933 v.val = sk->sk_protocol;
934 break;
935
0d6038ee
JE		 936 case SO_DOMAIN:
937 v.val = sk->sk_family;
938 break;
939
e71a4783
SH		 940 case SO_ERROR:
941 v.val = -sock_error(sk);
2a91525c 942 if (v.val == 0)
e71a4783
SH		 943 v.val = xchg(&sk->sk_err_soft, 0);
944 break;
945
946 case SO_OOBINLINE:
1b23a5df 947 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 948 break;
949
950 case SO_NO_CHECK:
951 v.val = sk->sk_no_check;
952 break;
953
954 case SO_PRIORITY:
955 v.val = sk->sk_priority;
956 break;
957
958 case SO_LINGER:
959 lv = sizeof(v.ling);
1b23a5df 960 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 961 v.ling.l_linger = sk->sk_lingertime / HZ;
962 break;
963
964 case SO_BSDCOMPAT:
965 sock_warn_obsolete_bsdism("getsockopt");
966 break;
967
968 case SO_TIMESTAMP:
92f37fd2
ED		 969 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
970 !sock_flag(sk, SOCK_RCVTSTAMPNS);
971 break;
972
973 case SO_TIMESTAMPNS:
974 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 975 break;
976
20d49473
PO		 977 case SO_TIMESTAMPING:
978 v.val = 0;
979 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
980 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
981 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
982 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
983 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
984 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
985 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
986 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
987 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
988 v.val |= SOF_TIMESTAMPING_SOFTWARE;
989 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
990 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
991 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
992 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
993 break;
994
e71a4783 995 case SO_RCVTIMEO:
2a91525c 996 lv = sizeof(struct timeval);
e71a4783
SH		 997 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
998 v.tm.tv_sec = 0;
999 v.tm.tv_usec = 0;
1000 } else {
1001 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1002 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1003 }
1004 break;
1005
1006 case SO_SNDTIMEO:
2a91525c 1007 lv = sizeof(struct timeval);
e71a4783
SH		 1008 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1009 v.tm.tv_sec = 0;
1010 v.tm.tv_usec = 0;
1011 } else {
1012 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1013 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1014 }
1015 break;
1da177e4 1016
e71a4783
SH		 1017 case SO_RCVLOWAT:
1018 v.val = sk->sk_rcvlowat;
1019 break;
1da177e4 1020
e71a4783 1021 case SO_SNDLOWAT:
2a91525c 1022 v.val = 1;
e71a4783 1023 break;
1da177e4 1024
e71a4783 1025 case SO_PASSCRED:
82981930 1026 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1027 break;
1da177e4 1028
e71a4783 1029 case SO_PEERCRED:
109f6e39
EB		 1030 {
1031 struct ucred peercred;
1032 if (len > sizeof(peercred))
1033 len = sizeof(peercred);
1034 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1035 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1036 return -EFAULT;
1037 goto lenout;
109f6e39 1038 }
1da177e4 1039
e71a4783
SH		 1040 case SO_PEERNAME:
1041 {
1042 char address[128];
1043
1044 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1045 return -ENOTCONN;
1046 if (lv < len)
1047 return -EINVAL;
1048 if (copy_to_user(optval, address, len))
1049 return -EFAULT;
1050 goto lenout;
1051 }
1da177e4 1052
e71a4783
SH		 1053 /* Dubious BSD thing... Probably nobody even uses it, but
1054 * the UNIX standard wants it for whatever reason... -DaveM
1055 */
1056 case SO_ACCEPTCONN:
1057 v.val = sk->sk_state == TCP_LISTEN;
1058 break;
1da177e4 1059
e71a4783 1060 case SO_PASSSEC:
82981930 1061 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1062 break;
877ce7c1 1063
e71a4783
SH		 1064 case SO_PEERSEC:
1065 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1066
4a19ec58
LAT		 1067 case SO_MARK:
1068 v.val = sk->sk_mark;
1069 break;
1070
3b885787 1071 case SO_RXQ_OVFL:
1b23a5df 1072 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1073 break;
1074
6e3e939f 1075 case SO_WIFI_STATUS:
1b23a5df 1076 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1077 break;
1078
ef64a54f
PE		 1079 case SO_PEEK_OFF:
1080 if (!sock->ops->set_peek_off)
1081 return -EOPNOTSUPP;
1082
1083 v.val = sk->sk_peek_off;
1084 break;
bc2f7996 1085 case SO_NOFCS:
1b23a5df 1086 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1087 break;
e71a4783
SH		 1088 default:
1089 return -ENOPROTOOPT;
1da177e4 1090 }
e71a4783 1091
1da177e4
LT		 1092 if (len > lv)
1093 len = lv;
1094 if (copy_to_user(optval, &v, len))
1095 return -EFAULT;
1096lenout:
4ec93edb
YH		 1097 if (put_user(len, optlen))
1098 return -EFAULT;
1099 return 0;
1da177e4
LT		 1100}
1101
a5b5bb9a
IM		 1102/*
1103 * Initialize an sk_lock.
1104 *
1105 * (We also register the sk_lock with the lock validator.)
1106 */
b6f99a21 1107static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1108{
ed07536e
PZ		 1109 sock_lock_init_class_and_name(sk,
1110 af_family_slock_key_strings[sk->sk_family],
1111 af_family_slock_keys + sk->sk_family,
1112 af_family_key_strings[sk->sk_family],
1113 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1114}
1115
4dc6dc71
ED		 1116/*
1117 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1118 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1119 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1120 */
f1a6c4da
PE		 1121static void sock_copy(struct sock *nsk, const struct sock *osk)
1122{
1123#ifdef CONFIG_SECURITY_NETWORK
1124 void *sptr = nsk->sk_security;
1125#endif
68835aba
ED		 1126 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1127
1128 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1129 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1130
f1a6c4da
PE		 1131#ifdef CONFIG_SECURITY_NETWORK
1132 nsk->sk_security = sptr;
1133 security_sk_clone(osk, nsk);
1134#endif
1135}
1136
fcbdf09d
OP		 1137/*
1138 * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes
1139 * un-modified. Special care is taken when initializing object to zero.
1140 */
1141static inline void sk_prot_clear_nulls(struct sock *sk, int size)
1142{
1143 if (offsetof(struct sock, sk_node.next) != 0)
1144 memset(sk, 0, offsetof(struct sock, sk_node.next));
1145 memset(&sk->sk_node.pprev, 0,
1146 size - offsetof(struct sock, sk_node.pprev));
1147}
1148
1149void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1150{
1151 unsigned long nulls1, nulls2;
1152
1153 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1154 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1155 if (nulls1 > nulls2)
1156 swap(nulls1, nulls2);
1157
1158 if (nulls1 != 0)
1159 memset((char *)sk, 0, nulls1);
1160 memset((char *)sk + nulls1 + sizeof(void *), 0,
1161 nulls2 - nulls1 - sizeof(void *));
1162 memset((char *)sk + nulls2 + sizeof(void *), 0,
1163 size - nulls2 - sizeof(void *));
1164}
1165EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1166
2e4afe7b
PE		 1167static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1168 int family)
c308c1b2
PE		 1169{
1170 struct sock *sk;
1171 struct kmem_cache *slab;
1172
1173 slab = prot->slab;
e912b114
ED		 1174 if (slab != NULL) {
1175 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1176 if (!sk)
1177 return sk;
1178 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1179 if (prot->clear_sk)
1180 prot->clear_sk(sk, prot->obj_size);
1181 else
1182 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1183 }
fcbdf09d 1184 } else
c308c1b2
PE		 1185 sk = kmalloc(prot->obj_size, priority);
1186
2e4afe7b 1187 if (sk != NULL) {
a98b65a3
VN		 1188 kmemcheck_annotate_bitfield(sk, flags);
1189
2e4afe7b
PE		 1190 if (security_sk_alloc(sk, family, priority))
1191 goto out_free;
1192
1193 if (!try_module_get(prot->owner))
1194 goto out_free_sec;
e022f0b4 1195 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1196 }
1197
c308c1b2 1198 return sk;
2e4afe7b
PE		 1199
1200out_free_sec:
1201 security_sk_free(sk);
1202out_free:
1203 if (slab != NULL)
1204 kmem_cache_free(slab, sk);
1205 else
1206 kfree(sk);
1207 return NULL;
c308c1b2
PE		 1208}
1209
1210static void sk_prot_free(struct proto *prot, struct sock *sk)
1211{
1212 struct kmem_cache *slab;
2e4afe7b 1213 struct module *owner;
c308c1b2 1214
2e4afe7b 1215 owner = prot->owner;
c308c1b2 1216 slab = prot->slab;
2e4afe7b
PE		 1217
1218 security_sk_free(sk);
c308c1b2
PE		 1219 if (slab != NULL)
1220 kmem_cache_free(slab, sk);
1221 else
1222 kfree(sk);
2e4afe7b 1223 module_put(owner);
c308c1b2
PE		 1224}
1225
f8451725
HX		 1226#ifdef CONFIG_CGROUPS
1227void sock_update_classid(struct sock *sk)
1228{
1144182a 1229 u32 classid;
f8451725 1230
1144182a
PM		 1231 rcu_read_lock(); /* doing current task, which cannot vanish. */
1232 classid = task_cls_classid(current);
1233 rcu_read_unlock();
f8451725
HX		 1234 if (classid && classid != sk->sk_classid)
1235 sk->sk_classid = classid;
1236}
82862742 1237EXPORT_SYMBOL(sock_update_classid);
5bc1421e 1238
406a3c63 1239void sock_update_netprioidx(struct sock *sk, struct task_struct *task)
5bc1421e 1240{
5bc1421e
NH		 1241 if (in_interrupt())
1242 return;
2b73bc65 1243
406a3c63 1244 sk->sk_cgrp_prioidx = task_netprioidx(task);
5bc1421e
NH		 1245}
1246EXPORT_SYMBOL_GPL(sock_update_netprioidx);
f8451725
HX		 1247#endif
1248
1da177e4
LT		 1249/**
1250 * sk_alloc - All socket objects are allocated here
c4ea43c5 1251 * @net: the applicable net namespace
4dc3b16b
PP		 1252 * @family: protocol family
1253 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1254 * @prot: struct proto associated with this new sock instance
1da177e4 1255 */
1b8d7ae4 1256struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1257 struct proto *prot)
1da177e4 1258{
c308c1b2 1259 struct sock *sk;
1da177e4 1260
154adbc8 1261 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1262 if (sk) {
154adbc8
PE		 1263 sk->sk_family = family;
1264 /*
1265 * See comment in struct sock definition to understand
1266 * why we need sk_prot_creator -acme
1267 */
1268 sk->sk_prot = sk->sk_prot_creator = prot;
1269 sock_lock_init(sk);
3b1e0a65 1270 sock_net_set(sk, get_net(net));
d66ee058 1271 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725
HX		 1272
1273 sock_update_classid(sk);
406a3c63 1274 sock_update_netprioidx(sk, current);
1da177e4 1275 }
a79af59e 1276
2e4afe7b 1277 return sk;
1da177e4 1278}
2a91525c 1279EXPORT_SYMBOL(sk_alloc);
1da177e4 1280
2b85a34e 1281static void __sk_free(struct sock *sk)
1da177e4
LT		 1282{
1283 struct sk_filter *filter;
1da177e4
LT		 1284
1285 if (sk->sk_destruct)
1286 sk->sk_destruct(sk);
1287
a898def2
PM		 1288 filter = rcu_dereference_check(sk->sk_filter,
1289 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1290 if (filter) {
309dd5fc 1291 sk_filter_uncharge(sk, filter);
a9b3cd7f 1292 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1293 }
1294
08e29af3 1295 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1296
1297 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1298 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1299 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1300
109f6e39
EB		 1301 if (sk->sk_peer_cred)
1302 put_cred(sk->sk_peer_cred);
1303 put_pid(sk->sk_peer_pid);
3b1e0a65 1304 put_net(sock_net(sk));
c308c1b2 1305 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1306}
2b85a34e
ED		 1307
1308void sk_free(struct sock *sk)
1309{
1310 /*
25985edc 1311 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1312 * some packets are still in some tx queue.
1313 * If not null, sock_wfree() will call __sk_free(sk) later
1314 */
1315 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1316 __sk_free(sk);
1317}
2a91525c 1318EXPORT_SYMBOL(sk_free);
1da177e4 1319
edf02087 1320/*
25985edc
LDM		 1321 * Last sock_put should drop reference to sk->sk_net. It has already
1322 * been dropped in sk_change_net. Taking reference to stopping namespace
edf02087 1323 * is not an option.
25985edc 1324 * Take reference to a socket to remove it from hash _alive_ and after that
edf02087
DL		 1325 * destroy it in the context of init_net.
1326 */
1327void sk_release_kernel(struct sock *sk)
1328{
1329 if (sk == NULL || sk->sk_socket == NULL)
1330 return;
1331
1332 sock_hold(sk);
1333 sock_release(sk->sk_socket);
65a18ec5 1334 release_net(sock_net(sk));
3b1e0a65 1335 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1336 sock_put(sk);
1337}
45af1754 1338EXPORT_SYMBOL(sk_release_kernel);
edf02087 1339
475f1b52
SR		 1340static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1341{
1342 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1343 sock_update_memcg(newsk);
1344}
1345
e56c57d0
ED		 1346/**
1347 * sk_clone_lock - clone a socket, and lock its clone
1348 * @sk: the socket to clone
1349 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1350 *
1351 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1352 */
1353struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1354{
8fd1d178 1355 struct sock *newsk;
87d11ceb 1356
8fd1d178 1357 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1358 if (newsk != NULL) {
1359 struct sk_filter *filter;
1360
892c141e 1361 sock_copy(newsk, sk);
87d11ceb
ACM		 1362
1363 /* SANITY */
3b1e0a65 1364 get_net(sock_net(newsk));
87d11ceb
ACM		 1365 sk_node_init(&newsk->sk_node);
1366 sock_lock_init(newsk);
1367 bh_lock_sock(newsk);
fa438ccf 1368 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1369 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1370
1371 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1372 /*
1373 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1374 */
1375 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1376 atomic_set(&newsk->sk_omem_alloc, 0);
1377 skb_queue_head_init(&newsk->sk_receive_queue);
1378 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1379#ifdef CONFIG_NET_DMA
1380 skb_queue_head_init(&newsk->sk_async_wait_queue);
1381#endif
87d11ceb 1382
b6c6712a 1383 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1384 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1385 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1386 af_callback_keys + newsk->sk_family,
1387 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1388
1389 newsk->sk_dst_cache = NULL;
1390 newsk->sk_wmem_queued = 0;
1391 newsk->sk_forward_alloc = 0;
1392 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1393 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1394
1395 sock_reset_flag(newsk, SOCK_DONE);
1396 skb_queue_head_init(&newsk->sk_error_queue);
1397
0d7da9dd 1398 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb
ACM		 1399 if (filter != NULL)
1400 sk_filter_charge(newsk, filter);
1401
1402 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1403 /* It is still raw copy of parent, so invalidate
1404 * destructor and make plain sk_free() */
1405 newsk->sk_destruct = NULL;
b0691c8e 1406 bh_unlock_sock(newsk);
87d11ceb
ACM		 1407 sk_free(newsk);
1408 newsk = NULL;
1409 goto out;
1410 }
1411
1412 newsk->sk_err = 0;
1413 newsk->sk_priority = 0;
4dc6dc71
ED		 1414 /*
1415 * Before updating sk_refcnt, we must commit prior changes to memory
1416 * (Documentation/RCU/rculist_nulls.txt for details)
1417 */
1418 smp_wmb();
87d11ceb
ACM		 1419 atomic_set(&newsk->sk_refcnt, 2);
1420
1421 /*
1422 * Increment the counter in the same struct proto as the master
1423 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1424 * is the same as sk->sk_prot->socks, as this field was copied
1425 * with memcpy).
1426 *
1427 * This _changes_ the previous behaviour, where
1428 * tcp_create_openreq_child always was incrementing the
1429 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1430 * to be taken into account in all callers. -acme
1431 */
1432 sk_refcnt_debug_inc(newsk);
972692e0 1433 sk_set_socket(newsk, NULL);
43815482 1434 newsk->sk_wq = NULL;
87d11ceb 1435
f3f511e1
GC		 1436 sk_update_clone(sk, newsk);
1437
87d11ceb 1438 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1439 sk_sockets_allocated_inc(newsk);
704da560 1440
08e29af3 1441 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1442 net_enable_timestamp();
87d11ceb
ACM		 1443 }
1444out:
1445 return newsk;
1446}
e56c57d0 1447EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1448
9958089a
AK		 1449void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1450{
1451 __sk_dst_set(sk, dst);
1452 sk->sk_route_caps = dst->dev->features;
1453 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1454 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1455 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1456 if (sk_can_gso(sk)) {
82cc1a7a 1457 if (dst->header_len) {
9958089a 1458 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1459 } else {
9958089a 1460 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1461 sk->sk_gso_max_size = dst->dev->gso_max_size;
1485348d 1462 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
82cc1a7a 1463 }
9958089a
AK		 1464 }
1465}
1466EXPORT_SYMBOL_GPL(sk_setup_caps);
1467
1da177e4
LT		 1468void __init sk_init(void)
1469{
4481374c 1470 if (totalram_pages <= 4096) {
1da177e4
LT		 1471 sysctl_wmem_max = 32767;
1472 sysctl_rmem_max = 32767;
1473 sysctl_wmem_default = 32767;
1474 sysctl_rmem_default = 32767;
4481374c 1475 } else if (totalram_pages >= 131072) {
1da177e4
LT		 1476 sysctl_wmem_max = 131071;
1477 sysctl_rmem_max = 131071;
1478 }
1479}
1480
1481/*
1482 * Simple resource managers for sockets.
1483 */
1484
1485
4ec93edb
YH		 1486/*
1487 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1488 */
1489void sock_wfree(struct sk_buff *skb)
1490{
1491 struct sock *sk = skb->sk;
d99927f4 1492 unsigned int len = skb->truesize;
1da177e4 1493
d99927f4
ED		 1494 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1495 /*
1496 * Keep a reference on sk_wmem_alloc, this will be released
1497 * after sk_write_space() call
1498 */
1499 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1500 sk->sk_write_space(sk);
d99927f4
ED		 1501 len = 1;
1502 }
2b85a34e 1503 /*
d99927f4
ED		 1504 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1505 * could not do because of in-flight packets
2b85a34e 1506 */
d99927f4 1507 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1508 __sk_free(sk);
1da177e4 1509}
2a91525c 1510EXPORT_SYMBOL(sock_wfree);
1da177e4 1511
4ec93edb
YH		 1512/*
1513 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1514 */
1515void sock_rfree(struct sk_buff *skb)
1516{
1517 struct sock *sk = skb->sk;
d361fd59 1518 unsigned int len = skb->truesize;
1da177e4 1519
d361fd59
ED		 1520 atomic_sub(len, &sk->sk_rmem_alloc);
1521 sk_mem_uncharge(sk, len);
1da177e4 1522}
2a91525c 1523EXPORT_SYMBOL(sock_rfree);
1da177e4 1524
41063e9d
DM		 1525void sock_edemux(struct sk_buff *skb)
1526{
e812347c
ED		 1527 struct sock *sk = skb->sk;
1528
1c463e57 1529#ifdef CONFIG_INET
e812347c
ED		 1530 if (sk->sk_state == TCP_TIME_WAIT)
1531 inet_twsk_put(inet_twsk(sk));
1532 else
1c463e57 1533#endif
e812347c 1534 sock_put(sk);
41063e9d
DM		 1535}
1536EXPORT_SYMBOL(sock_edemux);
1da177e4
LT		 1537
1538int sock_i_uid(struct sock *sk)
1539{
1540 int uid;
1541
f064af1e 1542 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1543 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
f064af1e 1544 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1545 return uid;
1546}
2a91525c 1547EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1548
1549unsigned long sock_i_ino(struct sock *sk)
1550{
1551 unsigned long ino;
1552
f064af1e 1553 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1554 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1555 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1556 return ino;
1557}
2a91525c 1558EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1559
1560/*
1561 * Allocate a skb from the socket's send buffer.
1562 */
86a76caf 1563struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1564 gfp_t priority)
1da177e4
LT		 1565{
1566 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1567 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1568 if (skb) {
1569 skb_set_owner_w(skb, sk);
1570 return skb;
1571 }
1572 }
1573 return NULL;
1574}
2a91525c 1575EXPORT_SYMBOL(sock_wmalloc);
1da177e4
LT		 1576
1577/*
1578 * Allocate a skb from the socket's receive buffer.
4ec93edb 1579 */
86a76caf 1580struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1581 gfp_t priority)
1da177e4
LT		 1582{
1583 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1584 struct sk_buff *skb = alloc_skb(size, priority);
1585 if (skb) {
1586 skb_set_owner_r(skb, sk);
1587 return skb;
1588 }
1589 }
1590 return NULL;
1591}
1592
4ec93edb 1593/*
1da177e4 1594 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1595 */
dd0fc66f 1596void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1597{
95c96174 1598 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1599 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1600 void *mem;
1601 /* First do the add, to avoid the race if kmalloc
4ec93edb 1602 * might sleep.
1da177e4
LT		 1603 */
1604 atomic_add(size, &sk->sk_omem_alloc);
1605 mem = kmalloc(size, priority);
1606 if (mem)
1607 return mem;
1608 atomic_sub(size, &sk->sk_omem_alloc);
1609 }
1610 return NULL;
1611}
2a91525c 1612EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1613
1614/*
1615 * Free an option memory block.
1616 */
1617void sock_kfree_s(struct sock *sk, void *mem, int size)
1618{
1619 kfree(mem);
1620 atomic_sub(size, &sk->sk_omem_alloc);
1621}
2a91525c 1622EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1623
1624/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1625 I think, these locks should be removed for datagram sockets.
1626 */
2a91525c 1627static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1628{
1629 DEFINE_WAIT(wait);
1630
1631 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1632 for (;;) {
1633 if (!timeo)
1634 break;
1635 if (signal_pending(current))
1636 break;
1637 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1638 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1639 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1640 break;
1641 if (sk->sk_shutdown & SEND_SHUTDOWN)
1642 break;
1643 if (sk->sk_err)
1644 break;
1645 timeo = schedule_timeout(timeo);
1646 }
aa395145 1647 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1648 return timeo;
1649}
1650
1651
1652/*
1653 * Generic send/receive buffer handlers
1654 */
1655
4cc7f68d
HX		 1656struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1657 unsigned long data_len, int noblock,
1658 int *errcode)
1da177e4
LT		 1659{
1660 struct sk_buff *skb;
7d877f3b 1661 gfp_t gfp_mask;
1da177e4
LT		 1662 long timeo;
1663 int err;
cc9b17ad
JW		 1664 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1665
1666 err = -EMSGSIZE;
1667 if (npages > MAX_SKB_FRAGS)
1668 goto failure;
1da177e4
LT		 1669
1670 gfp_mask = sk->sk_allocation;
1671 if (gfp_mask & __GFP_WAIT)
1672 gfp_mask |= __GFP_REPEAT;
1673
1674 timeo = sock_sndtimeo(sk, noblock);
1675 while (1) {
1676 err = sock_error(sk);
1677 if (err != 0)
1678 goto failure;
1679
1680 err = -EPIPE;
1681 if (sk->sk_shutdown & SEND_SHUTDOWN)
1682 goto failure;
1683
1684 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1685 skb = alloc_skb(header_len, gfp_mask);
1da177e4 1686 if (skb) {
1da177e4
LT		 1687 int i;
1688
1689 /* No pages, we're done... */
1690 if (!data_len)
1691 break;
1692
1da177e4
LT		 1693 skb->truesize += data_len;
1694 skb_shinfo(skb)->nr_frags = npages;
1695 for (i = 0; i < npages; i++) {
1696 struct page *page;
1da177e4
LT		 1697
1698 page = alloc_pages(sk->sk_allocation, 0);
1699 if (!page) {
1700 err = -ENOBUFS;
1701 skb_shinfo(skb)->nr_frags = i;
1702 kfree_skb(skb);
1703 goto failure;
1704 }
1705
ea2ab693
IC		 1706 __skb_fill_page_desc(skb, i,
1707 page, 0,
1708 (data_len >= PAGE_SIZE ?
1709 PAGE_SIZE :
1710 data_len));
1da177e4
LT		 1711 data_len -= PAGE_SIZE;
1712 }
1713
1714 /* Full success... */
1715 break;
1716 }
1717 err = -ENOBUFS;
1718 goto failure;
1719 }
1720 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1721 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1722 err = -EAGAIN;
1723 if (!timeo)
1724 goto failure;
1725 if (signal_pending(current))
1726 goto interrupted;
1727 timeo = sock_wait_for_wmem(sk, timeo);
1728 }
1729
1730 skb_set_owner_w(skb, sk);
1731 return skb;
1732
1733interrupted:
1734 err = sock_intr_errno(timeo);
1735failure:
1736 *errcode = err;
1737 return NULL;
1738}
4cc7f68d 1739EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1740
4ec93edb 1741struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1742 int noblock, int *errcode)
1743{
1744 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1745}
2a91525c 1746EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4
LT		 1747
1748static void __lock_sock(struct sock *sk)
f39234d6
NK		 1749 __releases(&sk->sk_lock.slock)
1750 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1751{
1752 DEFINE_WAIT(wait);
1753
e71a4783 1754 for (;;) {
1da177e4
LT		 1755 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1756 TASK_UNINTERRUPTIBLE);
1757 spin_unlock_bh(&sk->sk_lock.slock);
1758 schedule();
1759 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1760 if (!sock_owned_by_user(sk))
1da177e4
LT		 1761 break;
1762 }
1763 finish_wait(&sk->sk_lock.wq, &wait);
1764}
1765
1766static void __release_sock(struct sock *sk)
f39234d6
NK		 1767 __releases(&sk->sk_lock.slock)
1768 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1769{
1770 struct sk_buff *skb = sk->sk_backlog.head;
1771
1772 do {
1773 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1774 bh_unlock_sock(sk);
1775
1776 do {
1777 struct sk_buff *next = skb->next;
1778
e4cbb02a 1779 prefetch(next);
7fee226a 1780 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1781 skb->next = NULL;
c57943a1 1782 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1783
1784 /*
1785 * We are in process context here with softirqs
1786 * disabled, use cond_resched_softirq() to preempt.
1787 * This is safe to do because we've taken the backlog
1788 * queue private:
1789 */
1790 cond_resched_softirq();
1791
1792 skb = next;
1793 } while (skb != NULL);
1794
1795 bh_lock_sock(sk);
e71a4783 1796 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1797
1798 /*
1799 * Doing the zeroing here guarantee we can not loop forever
1800 * while a wild producer attempts to flood us.
1801 */
1802 sk->sk_backlog.len = 0;
1da177e4
LT		 1803}
1804
1805/**
1806 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1807 * @sk: sock to wait on
1808 * @timeo: for how long
1da177e4
LT		 1809 *
1810 * Now socket state including sk->sk_err is changed only under lock,
1811 * hence we may omit checks after joining wait queue.
1812 * We check receive queue before schedule() only as optimization;
1813 * it is very likely that release_sock() added new data.
1814 */
1815int sk_wait_data(struct sock *sk, long *timeo)
1816{
1817 int rc;
1818 DEFINE_WAIT(wait);
1819
aa395145 1820 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1821 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1822 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1823 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1824 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1825 return rc;
1826}
1da177e4
LT		 1827EXPORT_SYMBOL(sk_wait_data);
1828
3ab224be
HA		 1829/**
1830 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1831 * @sk: socket
1832 * @size: memory size to allocate
1833 * @kind: allocation type
1834 *
1835 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1836 * rmem allocation. This function assumes that protocols which have
1837 * memory_pressure use sk_wmem_queued as write buffer accounting.
1838 */
1839int __sk_mem_schedule(struct sock *sk, int size, int kind)
1840{
1841 struct proto *prot = sk->sk_prot;
1842 int amt = sk_mem_pages(size);
8d987e5c 1843 long allocated;
e1aab161 1844 int parent_status = UNDER_LIMIT;
3ab224be
HA		 1845
1846 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 1847
e1aab161 1848 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 1849
1850 /* Under limit. */
e1aab161
GC		 1851 if (parent_status == UNDER_LIMIT &&
1852 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 1853 sk_leave_memory_pressure(sk);
3ab224be
HA		 1854 return 1;
1855 }
1856
e1aab161
GC		 1857 /* Under pressure. (we or our parents) */
1858 if ((parent_status > SOFT_LIMIT) ||
1859 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 1860 sk_enter_memory_pressure(sk);
3ab224be 1861
e1aab161
GC		 1862 /* Over hard limit (we or our parents) */
1863 if ((parent_status == OVER_LIMIT) ||
1864 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 1865 goto suppress_allocation;
1866
1867 /* guarantee minimum buffer size under pressure */
1868 if (kind == SK_MEM_RECV) {
1869 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1870 return 1;
180d8cd9 1871
3ab224be
HA		 1872 } else { /* SK_MEM_SEND */
1873 if (sk->sk_type == SOCK_STREAM) {
1874 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1875 return 1;
1876 } else if (atomic_read(&sk->sk_wmem_alloc) <
1877 prot->sysctl_wmem[0])
1878 return 1;
1879 }
1880
180d8cd9 1881 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 1882 int alloc;
1883
180d8cd9 1884 if (!sk_under_memory_pressure(sk))
1748376b 1885 return 1;
180d8cd9
GC		 1886 alloc = sk_sockets_allocated_read_positive(sk);
1887 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 1888 sk_mem_pages(sk->sk_wmem_queued +
1889 atomic_read(&sk->sk_rmem_alloc) +
1890 sk->sk_forward_alloc))
1891 return 1;
1892 }
1893
1894suppress_allocation:
1895
1896 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1897 sk_stream_moderate_sndbuf(sk);
1898
1899 /* Fail only if socket is _under_ its sndbuf.
1900 * In this case we cannot block, so that we have to fail.
1901 */
1902 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1903 return 1;
1904 }
1905
3847ce32
SM		 1906 trace_sock_exceed_buf_limit(sk, prot, allocated);
1907
3ab224be
HA		 1908 /* Alas. Undo changes. */
1909 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 1910
0e90b31f 1911 sk_memory_allocated_sub(sk, amt);
180d8cd9 1912
3ab224be
HA		 1913 return 0;
1914}
3ab224be
HA		 1915EXPORT_SYMBOL(__sk_mem_schedule);
1916
1917/**
1918 * __sk_reclaim - reclaim memory_allocated
1919 * @sk: socket
1920 */
1921void __sk_mem_reclaim(struct sock *sk)
1922{
180d8cd9 1923 sk_memory_allocated_sub(sk,
0e90b31f 1924 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
3ab224be
HA		 1925 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1926
180d8cd9
GC		 1927 if (sk_under_memory_pressure(sk) &&
1928 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
1929 sk_leave_memory_pressure(sk);
3ab224be 1930}
3ab224be
HA		 1931EXPORT_SYMBOL(__sk_mem_reclaim);
1932
1933
1da177e4
LT		 1934/*
1935 * Set of default routines for initialising struct proto_ops when
1936 * the protocol does not support a particular function. In certain
1937 * cases where it makes no sense for a protocol to have a "do nothing"
1938 * function, some default processing is provided.
1939 */
1940
1941int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1942{
1943 return -EOPNOTSUPP;
1944}
2a91525c 1945EXPORT_SYMBOL(sock_no_bind);
1da177e4 1946
4ec93edb 1947int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1948 int len, int flags)
1949{
1950 return -EOPNOTSUPP;
1951}
2a91525c 1952EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 1953
1954int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1955{
1956 return -EOPNOTSUPP;
1957}
2a91525c 1958EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 1959
1960int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1961{
1962 return -EOPNOTSUPP;
1963}
2a91525c 1964EXPORT_SYMBOL(sock_no_accept);
1da177e4 1965
4ec93edb 1966int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1967 int *len, int peer)
1968{
1969 return -EOPNOTSUPP;
1970}
2a91525c 1971EXPORT_SYMBOL(sock_no_getname);
1da177e4 1972
2a91525c 1973unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 1974{
1975 return 0;
1976}
2a91525c 1977EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 1978
1979int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1980{
1981 return -EOPNOTSUPP;
1982}
2a91525c 1983EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 1984
1985int sock_no_listen(struct socket *sock, int backlog)
1986{
1987 return -EOPNOTSUPP;
1988}
2a91525c 1989EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 1990
1991int sock_no_shutdown(struct socket *sock, int how)
1992{
1993 return -EOPNOTSUPP;
1994}
2a91525c 1995EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 1996
1997int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 1998 char __user *optval, unsigned int optlen)
1da177e4
LT		 1999{
2000 return -EOPNOTSUPP;
2001}
2a91525c 2002EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2003
2004int sock_no_getsockopt(struct socket *sock, int level, int optname,
2005 char __user *optval, int __user *optlen)
2006{
2007 return -EOPNOTSUPP;
2008}
2a91525c 2009EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 2010
2011int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2012 size_t len)
2013{
2014 return -EOPNOTSUPP;
2015}
2a91525c 2016EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 2017
2018int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2019 size_t len, int flags)
2020{
2021 return -EOPNOTSUPP;
2022}
2a91525c 2023EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2024
2025int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2026{
2027 /* Mirror missing mmap method error code */
2028 return -ENODEV;
2029}
2a91525c 2030EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2031
2032ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2033{
2034 ssize_t res;
2035 struct msghdr msg = {.msg_flags = flags};
2036 struct kvec iov;
2037 char *kaddr = kmap(page);
2038 iov.iov_base = kaddr + offset;
2039 iov.iov_len = size;
2040 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2041 kunmap(page);
2042 return res;
2043}
2a91525c 2044EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2045
2046/*
2047 * Default Socket Callbacks
2048 */
2049
2050static void sock_def_wakeup(struct sock *sk)
2051{
43815482
ED		 2052 struct socket_wq *wq;
2053
2054 rcu_read_lock();
2055 wq = rcu_dereference(sk->sk_wq);
2056 if (wq_has_sleeper(wq))
2057 wake_up_interruptible_all(&wq->wait);
2058 rcu_read_unlock();
1da177e4
LT		 2059}
2060
2061static void sock_def_error_report(struct sock *sk)
2062{
43815482
ED		 2063 struct socket_wq *wq;
2064
2065 rcu_read_lock();
2066 wq = rcu_dereference(sk->sk_wq);
2067 if (wq_has_sleeper(wq))
2068 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2069 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2070 rcu_read_unlock();
1da177e4
LT		 2071}
2072
2073static void sock_def_readable(struct sock *sk, int len)
2074{
43815482
ED		 2075 struct socket_wq *wq;
2076
2077 rcu_read_lock();
2078 wq = rcu_dereference(sk->sk_wq);
2079 if (wq_has_sleeper(wq))
2c6607c6 2080 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2081 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2082 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2083 rcu_read_unlock();
1da177e4
LT		 2084}
2085
2086static void sock_def_write_space(struct sock *sk)
2087{
43815482
ED		 2088 struct socket_wq *wq;
2089
2090 rcu_read_lock();
1da177e4
LT		 2091
2092 /* Do not wake up a writer until he can make "significant"
2093 * progress. --DaveM
2094 */
e71a4783 2095 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2096 wq = rcu_dereference(sk->sk_wq);
2097 if (wq_has_sleeper(wq))
2098 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2099 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2100
2101 /* Should agree with poll, otherwise some programs break */
2102 if (sock_writeable(sk))
8d8ad9d7 2103 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2104 }
2105
43815482 2106 rcu_read_unlock();
1da177e4
LT		 2107}
2108
2109static void sock_def_destruct(struct sock *sk)
2110{
a51482bd 2111 kfree(sk->sk_protinfo);
1da177e4
LT		 2112}
2113
2114void sk_send_sigurg(struct sock *sk)
2115{
2116 if (sk->sk_socket && sk->sk_socket->file)
2117 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2118 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2119}
2a91525c 2120EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2121
2122void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2123 unsigned long expires)
2124{
2125 if (!mod_timer(timer, expires))
2126 sock_hold(sk);
2127}
1da177e4
LT		 2128EXPORT_SYMBOL(sk_reset_timer);
2129
2130void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2131{
2132 if (timer_pending(timer) && del_timer(timer))
2133 __sock_put(sk);
2134}
1da177e4
LT		 2135EXPORT_SYMBOL(sk_stop_timer);
2136
2137void sock_init_data(struct socket *sock, struct sock *sk)
2138{
2139 skb_queue_head_init(&sk->sk_receive_queue);
2140 skb_queue_head_init(&sk->sk_write_queue);
2141 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 2142#ifdef CONFIG_NET_DMA
2143 skb_queue_head_init(&sk->sk_async_wait_queue);
2144#endif
1da177e4
LT		 2145
2146 sk->sk_send_head = NULL;
2147
2148 init_timer(&sk->sk_timer);
4ec93edb 2149
1da177e4
LT		 2150 sk->sk_allocation = GFP_KERNEL;
2151 sk->sk_rcvbuf = sysctl_rmem_default;
2152 sk->sk_sndbuf = sysctl_wmem_default;
2153 sk->sk_state = TCP_CLOSE;
972692e0 2154 sk_set_socket(sk, sock);
1da177e4
LT		 2155
2156 sock_set_flag(sk, SOCK_ZAPPED);
2157
e71a4783 2158 if (sock) {
1da177e4 2159 sk->sk_type = sock->type;
43815482 2160 sk->sk_wq = sock->wq;
1da177e4
LT		 2161 sock->sk = sk;
2162 } else
43815482 2163 sk->sk_wq = NULL;
1da177e4 2164
b6c6712a 2165 spin_lock_init(&sk->sk_dst_lock);
1da177e4 2166 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2167 lockdep_set_class_and_name(&sk->sk_callback_lock,
2168 af_callback_keys + sk->sk_family,
2169 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2170
2171 sk->sk_state_change = sock_def_wakeup;
2172 sk->sk_data_ready = sock_def_readable;
2173 sk->sk_write_space = sock_def_write_space;
2174 sk->sk_error_report = sock_def_error_report;
2175 sk->sk_destruct = sock_def_destruct;
2176
2177 sk->sk_sndmsg_page = NULL;
2178 sk->sk_sndmsg_off = 0;
ef64a54f 2179 sk->sk_peek_off = -1;
1da177e4 2180
109f6e39
EB		 2181 sk->sk_peer_pid = NULL;
2182 sk->sk_peer_cred = NULL;
1da177e4
LT		 2183 sk->sk_write_pending = 0;
2184 sk->sk_rcvlowat = 1;
2185 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2186 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2187
f37f0afb 2188 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2189
4dc6dc71
ED		 2190 /*
2191 * Before updating sk_refcnt, we must commit prior changes to memory
2192 * (Documentation/RCU/rculist_nulls.txt for details)
2193 */
2194 smp_wmb();
1da177e4 2195 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2196 atomic_set(&sk->sk_drops, 0);
1da177e4 2197}
2a91525c 2198EXPORT_SYMBOL(sock_init_data);
1da177e4 2199
b5606c2d 2200void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2201{
2202 might_sleep();
a5b5bb9a 2203 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2204 if (sk->sk_lock.owned)
1da177e4 2205 __lock_sock(sk);
d2e9117c 2206 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2207 spin_unlock(&sk->sk_lock.slock);
2208 /*
2209 * The sk_lock has mutex_lock() semantics here:
2210 */
fcc70d5f 2211 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2212 local_bh_enable();
1da177e4 2213}
fcc70d5f 2214EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2215
b5606c2d 2216void release_sock(struct sock *sk)
1da177e4 2217{
a5b5bb9a
IM		 2218 /*
2219 * The sk_lock has mutex_unlock() semantics:
2220 */
2221 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2222
2223 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2224 if (sk->sk_backlog.tail)
2225 __release_sock(sk);
46d3ceab
ED		 2226
2227 if (sk->sk_prot->release_cb)
2228 sk->sk_prot->release_cb(sk);
2229
d2e9117c 2230 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 2231 if (waitqueue_active(&sk->sk_lock.wq))
2232 wake_up(&sk->sk_lock.wq);
2233 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2234}
2235EXPORT_SYMBOL(release_sock);
2236
8a74ad60
ED		 2237/**
2238 * lock_sock_fast - fast version of lock_sock
2239 * @sk: socket
2240 *
2241 * This version should be used for very small section, where process wont block
2242 * return false if fast path is taken
2243 * sk_lock.slock locked, owned = 0, BH disabled
2244 * return true if slow path is taken
2245 * sk_lock.slock unlocked, owned = 1, BH enabled
2246 */
2247bool lock_sock_fast(struct sock *sk)
2248{
2249 might_sleep();
2250 spin_lock_bh(&sk->sk_lock.slock);
2251
2252 if (!sk->sk_lock.owned)
2253 /*
2254 * Note : We must disable BH
2255 */
2256 return false;
2257
2258 __lock_sock(sk);
2259 sk->sk_lock.owned = 1;
2260 spin_unlock(&sk->sk_lock.slock);
2261 /*
2262 * The sk_lock has mutex_lock() semantics here:
2263 */
2264 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2265 local_bh_enable();
2266 return true;
2267}
2268EXPORT_SYMBOL(lock_sock_fast);
2269
1da177e4 2270int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2271{
b7aa0bf7 2272 struct timeval tv;
1da177e4 2273 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2274 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2275 tv = ktime_to_timeval(sk->sk_stamp);
2276 if (tv.tv_sec == -1)
1da177e4 2277 return -ENOENT;
b7aa0bf7
ED		 2278 if (tv.tv_sec == 0) {
2279 sk->sk_stamp = ktime_get_real();
2280 tv = ktime_to_timeval(sk->sk_stamp);
2281 }
2282 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2283}
1da177e4
LT		 2284EXPORT_SYMBOL(sock_get_timestamp);
2285
ae40eb1e
ED		 2286int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2287{
2288 struct timespec ts;
2289 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2290 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2291 ts = ktime_to_timespec(sk->sk_stamp);
2292 if (ts.tv_sec == -1)
2293 return -ENOENT;
2294 if (ts.tv_sec == 0) {
2295 sk->sk_stamp = ktime_get_real();
2296 ts = ktime_to_timespec(sk->sk_stamp);
2297 }
2298 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2299}
2300EXPORT_SYMBOL(sock_get_timestampns);
2301
20d49473 2302void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2303{
20d49473 2304 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2305 unsigned long previous_flags = sk->sk_flags;
2306
20d49473
PO		 2307 sock_set_flag(sk, flag);
2308 /*
2309 * we just set one of the two flags which require net
2310 * time stamping, but time stamping might have been on
2311 * already because of the other one
2312 */
08e29af3 2313 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2314 net_enable_timestamp();
1da177e4
LT		 2315 }
2316}
1da177e4
LT		 2317
2318/*
2319 * Get a socket option on an socket.
2320 *
2321 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2322 * asynchronous errors should be reported by getsockopt. We assume
2323 * this means if you specify SO_ERROR (otherwise whats the point of it).
2324 */
2325int sock_common_getsockopt(struct socket *sock, int level, int optname,
2326 char __user *optval, int __user *optlen)
2327{
2328 struct sock *sk = sock->sk;
2329
2330 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2331}
1da177e4
LT		 2332EXPORT_SYMBOL(sock_common_getsockopt);
2333
3fdadf7d 2334#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2335int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2336 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2337{
2338 struct sock *sk = sock->sk;
2339
1e51f951 2340 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2341 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2342 optval, optlen);
3fdadf7d
DM		 2343 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2344}
2345EXPORT_SYMBOL(compat_sock_common_getsockopt);
2346#endif
2347
1da177e4
LT		 2348int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2349 struct msghdr *msg, size_t size, int flags)
2350{
2351 struct sock *sk = sock->sk;
2352 int addr_len = 0;
2353 int err;
2354
2355 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2356 flags & ~MSG_DONTWAIT, &addr_len);
2357 if (err >= 0)
2358 msg->msg_namelen = addr_len;
2359 return err;
2360}
1da177e4
LT		 2361EXPORT_SYMBOL(sock_common_recvmsg);
2362
2363/*
2364 * Set socket options on an inet socket.
2365 */
2366int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2367 char __user *optval, unsigned int optlen)
1da177e4
LT		 2368{
2369 struct sock *sk = sock->sk;
2370
2371 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2372}
1da177e4
LT		 2373EXPORT_SYMBOL(sock_common_setsockopt);
2374
3fdadf7d 2375#ifdef CONFIG_COMPAT
543d9cfe 2376int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2377 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2378{
2379 struct sock *sk = sock->sk;
2380
543d9cfe
ACM		 2381 if (sk->sk_prot->compat_setsockopt != NULL)
2382 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2383 optval, optlen);
3fdadf7d
DM		 2384 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2385}
2386EXPORT_SYMBOL(compat_sock_common_setsockopt);
2387#endif
2388
1da177e4
LT		 2389void sk_common_release(struct sock *sk)
2390{
2391 if (sk->sk_prot->destroy)
2392 sk->sk_prot->destroy(sk);
2393
2394 /*
2395 * Observation: when sock_common_release is called, processes have
2396 * no access to socket. But net still has.
2397 * Step one, detach it from networking:
2398 *
2399 * A. Remove from hash tables.
2400 */
2401
2402 sk->sk_prot->unhash(sk);
2403
2404 /*
2405 * In this point socket cannot receive new packets, but it is possible
2406 * that some packets are in flight because some CPU runs receiver and
2407 * did hash table lookup before we unhashed socket. They will achieve
2408 * receive queue and will be purged by socket destructor.
2409 *
2410 * Also we still have packets pending on receive queue and probably,
2411 * our own packets waiting in device queues. sock_destroy will drain
2412 * receive queue, but transmitted packets will delay socket destruction
2413 * until the last reference will be released.
2414 */
2415
2416 sock_orphan(sk);
2417
2418 xfrm_sk_free_policy(sk);
2419
e6848976 2420 sk_refcnt_debug_release(sk);
1da177e4
LT		 2421 sock_put(sk);
2422}
1da177e4
LT		 2423EXPORT_SYMBOL(sk_common_release);
2424
13ff3d6f
PE		 2425#ifdef CONFIG_PROC_FS
2426#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2427struct prot_inuse {
2428 int val[PROTO_INUSE_NR];
2429};
13ff3d6f
PE		 2430
2431static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2432
2433#ifdef CONFIG_NET_NS
2434void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2435{
d6d9ca0f 2436 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2437}
2438EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2439
2440int sock_prot_inuse_get(struct net *net, struct proto *prot)
2441{
2442 int cpu, idx = prot->inuse_idx;
2443 int res = 0;
2444
2445 for_each_possible_cpu(cpu)
2446 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2447
2448 return res >= 0 ? res : 0;
2449}
2450EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2451
2c8c1e72 2452static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2453{
2454 net->core.inuse = alloc_percpu(struct prot_inuse);
2455 return net->core.inuse ? 0 : -ENOMEM;
2456}
2457
2c8c1e72 2458static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2459{
2460 free_percpu(net->core.inuse);
2461}
2462
2463static struct pernet_operations net_inuse_ops = {
2464 .init = sock_inuse_init_net,
2465 .exit = sock_inuse_exit_net,
2466};
2467
2468static __init int net_inuse_init(void)
2469{
2470 if (register_pernet_subsys(&net_inuse_ops))
2471 panic("Cannot initialize net inuse counters");
2472
2473 return 0;
2474}
2475
2476core_initcall(net_inuse_init);
2477#else
1338d466
PE		 2478static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2479
c29a0bc4 2480void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2481{
d6d9ca0f 2482 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2483}
2484EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2485
c29a0bc4 2486int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2487{
2488 int cpu, idx = prot->inuse_idx;
2489 int res = 0;
2490
2491 for_each_possible_cpu(cpu)
2492 res += per_cpu(prot_inuse, cpu).val[idx];
2493
2494 return res >= 0 ? res : 0;
2495}
2496EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2497#endif
13ff3d6f
PE		 2498
2499static void assign_proto_idx(struct proto *prot)
2500{
2501 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2502
2503 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2504 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2505 return;
2506 }
2507
2508 set_bit(prot->inuse_idx, proto_inuse_idx);
2509}
2510
2511static void release_proto_idx(struct proto *prot)
2512{
2513 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2514 clear_bit(prot->inuse_idx, proto_inuse_idx);
2515}
2516#else
2517static inline void assign_proto_idx(struct proto *prot)
2518{
2519}
2520
2521static inline void release_proto_idx(struct proto *prot)
2522{
2523}
2524#endif
2525
b733c007
PE		 2526int proto_register(struct proto *prot, int alloc_slab)
2527{
1da177e4
LT		 2528 if (alloc_slab) {
2529 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2530 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2531 NULL);
1da177e4
LT		 2532
2533 if (prot->slab == NULL) {
e005d193
JP		 2534 pr_crit("%s: Can't create sock SLAB cache!\n",
2535 prot->name);
60e7663d 2536 goto out;
1da177e4 2537 }
2e6599cb
ACM		 2538
2539 if (prot->rsk_prot != NULL) {
faf23422 2540 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2541 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2542 goto out_free_sock_slab;
2543
7e56b5d6 2544 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2545 prot->rsk_prot->obj_size, 0,
20c2df83 2546 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2547
2548 if (prot->rsk_prot->slab == NULL) {
e005d193
JP		 2549 pr_crit("%s: Can't create request sock SLAB cache!\n",
2550 prot->name);
2e6599cb
ACM		 2551 goto out_free_request_sock_slab_name;
2552 }
2553 }
8feaf0c0 2554
6d6ee43e 2555 if (prot->twsk_prot != NULL) {
faf23422 2556 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2557
7e56b5d6 2558 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2559 goto out_free_request_sock_slab;
2560
6d6ee43e 2561 prot->twsk_prot->twsk_slab =
7e56b5d6 2562 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2563 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2564 0,
2565 SLAB_HWCACHE_ALIGN |
2566 prot->slab_flags,
20c2df83 2567 NULL);
6d6ee43e 2568 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2569 goto out_free_timewait_sock_slab_name;
2570 }
1da177e4
LT		 2571 }
2572
36b77a52 2573 mutex_lock(&proto_list_mutex);
1da177e4 2574 list_add(&prot->node, &proto_list);
13ff3d6f 2575 assign_proto_idx(prot);
36b77a52 2576 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2577 return 0;
2578
8feaf0c0 2579out_free_timewait_sock_slab_name:
7e56b5d6 2580 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2581out_free_request_sock_slab:
2582 if (prot->rsk_prot && prot->rsk_prot->slab) {
2583 kmem_cache_destroy(prot->rsk_prot->slab);
2584 prot->rsk_prot->slab = NULL;
2585 }
2e6599cb 2586out_free_request_sock_slab_name:
72150e9b
DC		 2587 if (prot->rsk_prot)
2588 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2589out_free_sock_slab:
2590 kmem_cache_destroy(prot->slab);
2591 prot->slab = NULL;
b733c007
PE		 2592out:
2593 return -ENOBUFS;
1da177e4 2594}
1da177e4
LT		 2595EXPORT_SYMBOL(proto_register);
2596
2597void proto_unregister(struct proto *prot)
2598{
36b77a52 2599 mutex_lock(&proto_list_mutex);
13ff3d6f 2600 release_proto_idx(prot);
0a3f4358 2601 list_del(&prot->node);
36b77a52 2602 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2603
2604 if (prot->slab != NULL) {
2605 kmem_cache_destroy(prot->slab);
2606 prot->slab = NULL;
2607 }
2608
2e6599cb 2609 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2610 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2611 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2612 prot->rsk_prot->slab = NULL;
2613 }
2614
6d6ee43e 2615 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2616 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2617 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2618 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2619 }
1da177e4 2620}
1da177e4
LT		 2621EXPORT_SYMBOL(proto_unregister);
2622
2623#ifdef CONFIG_PROC_FS
1da177e4 2624static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2625 __acquires(proto_list_mutex)
1da177e4 2626{
36b77a52 2627 mutex_lock(&proto_list_mutex);
60f0438a 2628 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2629}
2630
2631static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2632{
60f0438a 2633 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2634}
2635
2636static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2637 __releases(proto_list_mutex)
1da177e4 2638{
36b77a52 2639 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2640}
2641
2642static char proto_method_implemented(const void *method)
2643{
2644 return method == NULL ? 'n' : 'y';
2645}
180d8cd9
GC		 2646static long sock_prot_memory_allocated(struct proto *proto)
2647{
cb75a36c 2648 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2649}
2650
2651static char *sock_prot_memory_pressure(struct proto *proto)
2652{
2653 return proto->memory_pressure != NULL ?
2654 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2655}
1da177e4
LT		 2656
2657static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2658{
180d8cd9 2659
8d987e5c 2660 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2661 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2662 proto->name,
2663 proto->obj_size,
14e943db 2664 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2665 sock_prot_memory_allocated(proto),
2666 sock_prot_memory_pressure(proto),
1da177e4
LT		 2667 proto->max_header,
2668 proto->slab == NULL ? "no" : "yes",
2669 module_name(proto->owner),
2670 proto_method_implemented(proto->close),
2671 proto_method_implemented(proto->connect),
2672 proto_method_implemented(proto->disconnect),
2673 proto_method_implemented(proto->accept),
2674 proto_method_implemented(proto->ioctl),
2675 proto_method_implemented(proto->init),
2676 proto_method_implemented(proto->destroy),
2677 proto_method_implemented(proto->shutdown),
2678 proto_method_implemented(proto->setsockopt),
2679 proto_method_implemented(proto->getsockopt),
2680 proto_method_implemented(proto->sendmsg),
2681 proto_method_implemented(proto->recvmsg),
2682 proto_method_implemented(proto->sendpage),
2683 proto_method_implemented(proto->bind),
2684 proto_method_implemented(proto->backlog_rcv),
2685 proto_method_implemented(proto->hash),
2686 proto_method_implemented(proto->unhash),
2687 proto_method_implemented(proto->get_port),
2688 proto_method_implemented(proto->enter_memory_pressure));
2689}
2690
2691static int proto_seq_show(struct seq_file *seq, void *v)
2692{
60f0438a 2693 if (v == &proto_list)
1da177e4
LT		 2694 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2695 "protocol",
2696 "size",
2697 "sockets",
2698 "memory",
2699 "press",
2700 "maxhdr",
2701 "slab",
2702 "module",
2703 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2704 else
60f0438a 2705 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2706 return 0;
2707}
2708
f690808e 2709static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2710 .start = proto_seq_start,
2711 .next = proto_seq_next,
2712 .stop = proto_seq_stop,
2713 .show = proto_seq_show,
2714};
2715
2716static int proto_seq_open(struct inode *inode, struct file *file)
2717{
14e943db
ED		 2718 return seq_open_net(inode, file, &proto_seq_ops,
2719 sizeof(struct seq_net_private));
1da177e4
LT		 2720}
2721
9a32144e 2722static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2723 .owner = THIS_MODULE,
2724 .open = proto_seq_open,
2725 .read = seq_read,
2726 .llseek = seq_lseek,
14e943db
ED		 2727 .release = seq_release_net,
2728};
2729
2730static __net_init int proto_init_net(struct net *net)
2731{
2732 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2733 return -ENOMEM;
2734
2735 return 0;
2736}
2737
2738static __net_exit void proto_exit_net(struct net *net)
2739{
2740 proc_net_remove(net, "protocols");
2741}
2742
2743
2744static __net_initdata struct pernet_operations proto_net_ops = {
2745 .init = proto_init_net,
2746 .exit = proto_exit_net,
1da177e4
LT		 2747};
2748
2749static int __init proto_init(void)
2750{
14e943db 2751 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2752}
2753
2754subsys_initcall(proto_init);
2755
2756#endif /* PROC_FS */
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