projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
sh_eth: coding style fixes
[deliverable/linux.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
4ec93edb 35 * code. The ACK stuff can wait and needs major
1da177e4
LT		 36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 *
85 *
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
90 */
91
e005d193
JP		 92#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
93
4fc268d2 94#include <linux/capability.h>
1da177e4 95#include <linux/errno.h>
cb820f8e 96#include <linux/errqueue.h>
1da177e4
LT		 97#include <linux/types.h>
98#include <linux/socket.h>
99#include <linux/in.h>
100#include <linux/kernel.h>
1da177e4
LT		 101#include <linux/module.h>
102#include <linux/proc_fs.h>
103#include <linux/seq_file.h>
104#include <linux/sched.h>
105#include <linux/timer.h>
106#include <linux/string.h>
107#include <linux/sockios.h>
108#include <linux/net.h>
109#include <linux/mm.h>
110#include <linux/slab.h>
111#include <linux/interrupt.h>
112#include <linux/poll.h>
113#include <linux/tcp.h>
114#include <linux/init.h>
a1f8e7f7 115#include <linux/highmem.h>
3f551f94 116#include <linux/user_namespace.h>
c5905afb 117#include <linux/static_key.h>
3969eb38 118#include <linux/memcontrol.h>
8c1ae10d 119#include <linux/prefetch.h>
1da177e4
LT		 120
121#include <asm/uaccess.h>
1da177e4
LT		 122
123#include <linux/netdevice.h>
124#include <net/protocol.h>
125#include <linux/skbuff.h>
457c4cbc 126#include <net/net_namespace.h>
2e6599cb 127#include <net/request_sock.h>
1da177e4 128#include <net/sock.h>
20d49473 129#include <linux/net_tstamp.h>
1da177e4
LT		 130#include <net/xfrm.h>
131#include <linux/ipsec.h>
f8451725 132#include <net/cls_cgroup.h>
5bc1421e 133#include <net/netprio_cgroup.h>
1da177e4
LT		 134
135#include <linux/filter.h>
136
3847ce32
SM		 137#include <trace/events/sock.h>
138
1da177e4
LT		 139#ifdef CONFIG_INET
140#include <net/tcp.h>
141#endif
142
076bb0c8 143#include <net/busy_poll.h>
06021292 144
36b77a52 145static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 146static LIST_HEAD(proto_list);
147
c255a458 148#ifdef CONFIG_MEMCG_KMEM
1d62e436 149int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
d1a4c0b3
GC		 150{
151 struct proto *proto;
152 int ret = 0;
153
36b77a52 154 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 155 list_for_each_entry(proto, &proto_list, node) {
156 if (proto->init_cgroup) {
1d62e436 157 ret = proto->init_cgroup(memcg, ss);
d1a4c0b3
GC		 158 if (ret)
159 goto out;
160 }
161 }
162
36b77a52 163 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 164 return ret;
165out:
166 list_for_each_entry_continue_reverse(proto, &proto_list, node)
167 if (proto->destroy_cgroup)
1d62e436 168 proto->destroy_cgroup(memcg);
36b77a52 169 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 170 return ret;
171}
172
1d62e436 173void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
d1a4c0b3
GC		 174{
175 struct proto *proto;
176
36b77a52 177 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 178 list_for_each_entry_reverse(proto, &proto_list, node)
179 if (proto->destroy_cgroup)
1d62e436 180 proto->destroy_cgroup(memcg);
36b77a52 181 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 182}
183#endif
184
da21f24d
IM		 185/*
186 * Each address family might have different locking rules, so we have
187 * one slock key per address family:
188 */
a5b5bb9a
IM		 189static struct lock_class_key af_family_keys[AF_MAX];
190static struct lock_class_key af_family_slock_keys[AF_MAX];
191
cbda4eaf 192#if defined(CONFIG_MEMCG_KMEM)
c5905afb 193struct static_key memcg_socket_limit_enabled;
e1aab161 194EXPORT_SYMBOL(memcg_socket_limit_enabled);
cbda4eaf 195#endif
e1aab161 196
a5b5bb9a
IM		 197/*
198 * Make lock validator output more readable. (we pre-construct these
199 * strings build-time, so that runtime initialization of socket
200 * locks is fast):
201 */
36cbd3dc 202static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 203 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
204 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
205 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
206 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
207 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
208 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
209 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 210 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 211 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 212 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 213 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 214 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 215 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
456db6a4 216 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX"
a5b5bb9a 217};
36cbd3dc 218static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 219 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
220 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
221 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
222 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
223 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
224 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
225 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 226 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 227 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 228 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 229 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 230 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 231 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
456db6a4 232 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX"
a5b5bb9a 233};
36cbd3dc 234static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 235 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
236 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
237 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
238 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
239 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
240 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
241 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 242 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 243 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 244 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 245 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 246 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 247 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
456db6a4 248 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX"
443aef0e 249};
da21f24d
IM		 250
251/*
252 * sk_callback_lock locking rules are per-address-family,
253 * so split the lock classes by using a per-AF key:
254 */
255static struct lock_class_key af_callback_keys[AF_MAX];
256
1da177e4
LT		 257/* Take into consideration the size of the struct sk_buff overhead in the
258 * determination of these values, since that is non-constant across
259 * platforms. This makes socket queueing behavior and performance
260 * not depend upon such differences.
261 */
262#define _SK_MEM_PACKETS 256
87fb4b7b 263#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 264#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
265#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
266
267/* Run time adjustable parameters. */
ab32ea5d 268__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 269EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 270__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 271EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 272__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
273__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 274
25985edc 275/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 276int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 277EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 278
c93bdd0e
MG		 279struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
280EXPORT_SYMBOL_GPL(memalloc_socks);
281
7cb02404
MG		 282/**
283 * sk_set_memalloc - sets %SOCK_MEMALLOC
284 * @sk: socket to set it on
285 *
286 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
287 * It's the responsibility of the admin to adjust min_free_kbytes
288 * to meet the requirements
289 */
290void sk_set_memalloc(struct sock *sk)
291{
292 sock_set_flag(sk, SOCK_MEMALLOC);
293 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 294 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 295}
296EXPORT_SYMBOL_GPL(sk_set_memalloc);
297
298void sk_clear_memalloc(struct sock *sk)
299{
300 sock_reset_flag(sk, SOCK_MEMALLOC);
301 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 302 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 303
304 /*
305 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
306 * progress of swapping. However, if SOCK_MEMALLOC is cleared while
307 * it has rmem allocations there is a risk that the user of the
308 * socket cannot make forward progress due to exceeding the rmem
309 * limits. By rights, sk_clear_memalloc() should only be called
310 * on sockets being torn down but warn and reset the accounting if
311 * that assumption breaks.
312 */
313 if (WARN_ON(sk->sk_forward_alloc))
314 sk_mem_reclaim(sk);
7cb02404
MG		 315}
316EXPORT_SYMBOL_GPL(sk_clear_memalloc);
317
b4b9e355
MG		 318int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
319{
320 int ret;
321 unsigned long pflags = current->flags;
322
323 /* these should have been dropped before queueing */
324 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
325
326 current->flags |= PF_MEMALLOC;
327 ret = sk->sk_backlog_rcv(sk, skb);
328 tsk_restore_flags(current, pflags, PF_MEMALLOC);
329
330 return ret;
331}
332EXPORT_SYMBOL(__sk_backlog_rcv);
333
1da177e4
LT		 334static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
335{
336 struct timeval tv;
337
338 if (optlen < sizeof(tv))
339 return -EINVAL;
340 if (copy_from_user(&tv, optval, sizeof(tv)))
341 return -EFAULT;
ba78073e
VA		 342 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
343 return -EDOM;
1da177e4 344
ba78073e 345 if (tv.tv_sec < 0) {
6f11df83
AM		 346 static int warned __read_mostly;
347
ba78073e 348 *timeo_p = 0;
50aab54f 349 if (warned < 10 && net_ratelimit()) {
ba78073e 350 warned++;
e005d193
JP		 351 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
352 __func__, current->comm, task_pid_nr(current));
50aab54f 353 }
ba78073e
VA		 354 return 0;
355 }
1da177e4
LT		 356 *timeo_p = MAX_SCHEDULE_TIMEOUT;
357 if (tv.tv_sec == 0 && tv.tv_usec == 0)
358 return 0;
359 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
360 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
361 return 0;
362}
363
364static void sock_warn_obsolete_bsdism(const char *name)
365{
366 static int warned;
367 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 368 if (strcmp(warncomm, current->comm) && warned < 5) {
369 strcpy(warncomm, current->comm);
e005d193
JP		 370 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
371 warncomm, name);
1da177e4
LT		 372 warned++;
373 }
374}
375
08e29af3
ED		 376#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
377
378static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 379{
08e29af3
ED		 380 if (sk->sk_flags & flags) {
381 sk->sk_flags &= ~flags;
382 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 383 net_disable_timestamp();
1da177e4
LT		 384 }
385}
386
387
f0088a50
DV		 388int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
389{
766e9037 390 int err;
f0088a50 391 int skb_len;
3b885787
NH		 392 unsigned long flags;
393 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 394
0fd7bac6 395 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 396 atomic_inc(&sk->sk_drops);
3847ce32 397 trace_sock_rcvqueue_full(sk, skb);
766e9037 398 return -ENOMEM;
f0088a50
DV		 399 }
400
fda9ef5d 401 err = sk_filter(sk, skb);
f0088a50 402 if (err)
766e9037 403 return err;
f0088a50 404
c76562b6 405 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 406 atomic_inc(&sk->sk_drops);
407 return -ENOBUFS;
3ab224be
HA		 408 }
409
f0088a50
DV		 410 skb->dev = NULL;
411 skb_set_owner_r(skb, sk);
49ad9599 412
f0088a50
DV		 413 /* Cache the SKB length before we tack it onto the receive
414 * queue. Once it is added it no longer belongs to us and
415 * may be freed by other threads of control pulling packets
416 * from the queue.
417 */
418 skb_len = skb->len;
419
7fee226a
ED		 420 /* we escape from rcu protected region, make sure we dont leak
421 * a norefcounted dst
422 */
423 skb_dst_force(skb);
424
3b885787
NH		 425 spin_lock_irqsave(&list->lock, flags);
426 skb->dropcount = atomic_read(&sk->sk_drops);
427 __skb_queue_tail(list, skb);
428 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 429
430 if (!sock_flag(sk, SOCK_DEAD))
431 sk->sk_data_ready(sk, skb_len);
766e9037 432 return 0;
f0088a50
DV		 433}
434EXPORT_SYMBOL(sock_queue_rcv_skb);
435
58a5a7b9 436int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 437{
438 int rc = NET_RX_SUCCESS;
439
fda9ef5d 440 if (sk_filter(sk, skb))
f0088a50
DV		 441 goto discard_and_relse;
442
443 skb->dev = NULL;
444
f545a38f 445 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) {
c377411f
ED		 446 atomic_inc(&sk->sk_drops);
447 goto discard_and_relse;
448 }
58a5a7b9
ACM		 449 if (nested)
450 bh_lock_sock_nested(sk);
451 else
452 bh_lock_sock(sk);
a5b5bb9a
IM		 453 if (!sock_owned_by_user(sk)) {
454 /*
455 * trylock + unlock semantics:
456 */
457 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
458
c57943a1 459 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 460
461 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 462 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 463 bh_unlock_sock(sk);
464 atomic_inc(&sk->sk_drops);
465 goto discard_and_relse;
466 }
467
f0088a50
DV		 468 bh_unlock_sock(sk);
469out:
470 sock_put(sk);
471 return rc;
472discard_and_relse:
473 kfree_skb(skb);
474 goto out;
475}
476EXPORT_SYMBOL(sk_receive_skb);
477
478struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
479{
b6c6712a 480 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 481
482 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 483 sk_tx_queue_clear(sk);
a9b3cd7f 484 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 485 dst_release(dst);
486 return NULL;
487 }
488
489 return dst;
490}
491EXPORT_SYMBOL(__sk_dst_check);
492
493struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
494{
495 struct dst_entry *dst = sk_dst_get(sk);
496
497 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
498 sk_dst_reset(sk);
499 dst_release(dst);
500 return NULL;
501 }
502
503 return dst;
504}
505EXPORT_SYMBOL(sk_dst_check);
506
c91f6df2
BH		 507static int sock_setbindtodevice(struct sock *sk, char __user *optval,
508 int optlen)
4878809f
DM		 509{
510 int ret = -ENOPROTOOPT;
511#ifdef CONFIG_NETDEVICES
3b1e0a65 512 struct net *net = sock_net(sk);
4878809f
DM		 513 char devname[IFNAMSIZ];
514 int index;
515
516 /* Sorry... */
517 ret = -EPERM;
5e1fccc0 518 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 519 goto out;
520
521 ret = -EINVAL;
522 if (optlen < 0)
523 goto out;
524
525 /* Bind this socket to a particular device like "eth0",
526 * as specified in the passed interface name. If the
527 * name is "" or the option length is zero the socket
528 * is not bound.
529 */
530 if (optlen > IFNAMSIZ - 1)
531 optlen = IFNAMSIZ - 1;
532 memset(devname, 0, sizeof(devname));
533
534 ret = -EFAULT;
535 if (copy_from_user(devname, optval, optlen))
536 goto out;
537
000ba2e4
DM		 538 index = 0;
539 if (devname[0] != '\0') {
bf8e56bf 540 struct net_device *dev;
4878809f 541
bf8e56bf
ED		 542 rcu_read_lock();
543 dev = dev_get_by_name_rcu(net, devname);
544 if (dev)
545 index = dev->ifindex;
546 rcu_read_unlock();
4878809f
DM		 547 ret = -ENODEV;
548 if (!dev)
549 goto out;
4878809f
DM		 550 }
551
552 lock_sock(sk);
553 sk->sk_bound_dev_if = index;
554 sk_dst_reset(sk);
555 release_sock(sk);
556
557 ret = 0;
558
559out:
560#endif
561
562 return ret;
563}
564
c91f6df2
BH		 565static int sock_getbindtodevice(struct sock *sk, char __user *optval,
566 int __user *optlen, int len)
567{
568 int ret = -ENOPROTOOPT;
569#ifdef CONFIG_NETDEVICES
570 struct net *net = sock_net(sk);
c91f6df2 571 char devname[IFNAMSIZ];
c91f6df2
BH		 572
573 if (sk->sk_bound_dev_if == 0) {
574 len = 0;
575 goto zero;
576 }
577
578 ret = -EINVAL;
579 if (len < IFNAMSIZ)
580 goto out;
581
5dbe7c17
NS		 582 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
583 if (ret)
c91f6df2 584 goto out;
c91f6df2
BH		 585
586 len = strlen(devname) + 1;
587
588 ret = -EFAULT;
589 if (copy_to_user(optval, devname, len))
590 goto out;
591
592zero:
593 ret = -EFAULT;
594 if (put_user(len, optlen))
595 goto out;
596
597 ret = 0;
598
599out:
600#endif
601
602 return ret;
603}
604
c0ef877b
PE		 605static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
606{
607 if (valbool)
608 sock_set_flag(sk, bit);
609 else
610 sock_reset_flag(sk, bit);
611}
612
1da177e4
LT		 613/*
614 * This is meant for all protocols to use and covers goings on
615 * at the socket level. Everything here is generic.
616 */
617
618int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 619 char __user *optval, unsigned int optlen)
1da177e4 620{
2a91525c 621 struct sock *sk = sock->sk;
1da177e4
LT		 622 int val;
623 int valbool;
624 struct linger ling;
625 int ret = 0;
4ec93edb 626
1da177e4
LT		 627 /*
628 * Options without arguments
629 */
630
4878809f 631 if (optname == SO_BINDTODEVICE)
c91f6df2 632 return sock_setbindtodevice(sk, optval, optlen);
4878809f 633
e71a4783
SH		 634 if (optlen < sizeof(int))
635 return -EINVAL;
4ec93edb 636
1da177e4
LT		 637 if (get_user(val, (int __user *)optval))
638 return -EFAULT;
4ec93edb 639
2a91525c 640 valbool = val ? 1 : 0;
1da177e4
LT		 641
642 lock_sock(sk);
643
2a91525c 644 switch (optname) {
e71a4783 645 case SO_DEBUG:
2a91525c 646 if (val && !capable(CAP_NET_ADMIN))
e71a4783 647 ret = -EACCES;
2a91525c 648 else
c0ef877b 649 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 650 break;
651 case SO_REUSEADDR:
4a17fd52 652 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 653 break;
055dc21a
TH		 654 case SO_REUSEPORT:
655 sk->sk_reuseport = valbool;
656 break;
e71a4783 657 case SO_TYPE:
49c794e9 658 case SO_PROTOCOL:
0d6038ee 659 case SO_DOMAIN:
e71a4783
SH		 660 case SO_ERROR:
661 ret = -ENOPROTOOPT;
662 break;
663 case SO_DONTROUTE:
c0ef877b 664 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 665 break;
666 case SO_BROADCAST:
667 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
668 break;
669 case SO_SNDBUF:
670 /* Don't error on this BSD doesn't and if you think
82981930
ED		 671 * about it this is right. Otherwise apps have to
672 * play 'guess the biggest size' games. RCVBUF/SNDBUF
673 * are treated in BSD as hints
674 */
675 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 676set_sndbuf:
e71a4783 677 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 678 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
679 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 680 sk->sk_write_space(sk);
681 break;
1da177e4 682
e71a4783
SH		 683 case SO_SNDBUFFORCE:
684 if (!capable(CAP_NET_ADMIN)) {
685 ret = -EPERM;
686 break;
687 }
688 goto set_sndbuf;
b0573dea 689
e71a4783
SH		 690 case SO_RCVBUF:
691 /* Don't error on this BSD doesn't and if you think
82981930
ED		 692 * about it this is right. Otherwise apps have to
693 * play 'guess the biggest size' games. RCVBUF/SNDBUF
694 * are treated in BSD as hints
695 */
696 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 697set_rcvbuf:
e71a4783
SH		 698 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
699 /*
700 * We double it on the way in to account for
701 * "struct sk_buff" etc. overhead. Applications
702 * assume that the SO_RCVBUF setting they make will
703 * allow that much actual data to be received on that
704 * socket.
705 *
706 * Applications are unaware that "struct sk_buff" and
707 * other overheads allocate from the receive buffer
708 * during socket buffer allocation.
709 *
710 * And after considering the possible alternatives,
711 * returning the value we actually used in getsockopt
712 * is the most desirable behavior.
713 */
82981930 714 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 715 break;
716
717 case SO_RCVBUFFORCE:
718 if (!capable(CAP_NET_ADMIN)) {
719 ret = -EPERM;
1da177e4 720 break;
e71a4783
SH		 721 }
722 goto set_rcvbuf;
1da177e4 723
e71a4783 724 case SO_KEEPALIVE:
1da177e4 725#ifdef CONFIG_INET
3e10986d
ED		 726 if (sk->sk_protocol == IPPROTO_TCP &&
727 sk->sk_type == SOCK_STREAM)
e71a4783 728 tcp_set_keepalive(sk, valbool);
1da177e4 729#endif
e71a4783
SH		 730 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
731 break;
732
733 case SO_OOBINLINE:
734 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
735 break;
736
737 case SO_NO_CHECK:
738 sk->sk_no_check = valbool;
739 break;
740
741 case SO_PRIORITY:
5e1fccc0
EB		 742 if ((val >= 0 && val <= 6) ||
743 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 744 sk->sk_priority = val;
745 else
746 ret = -EPERM;
747 break;
748
749 case SO_LINGER:
750 if (optlen < sizeof(ling)) {
751 ret = -EINVAL; /* 1003.1g */
1da177e4 752 break;
e71a4783 753 }
2a91525c 754 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 755 ret = -EFAULT;
1da177e4 756 break;
e71a4783
SH		 757 }
758 if (!ling.l_onoff)
759 sock_reset_flag(sk, SOCK_LINGER);
760 else {
1da177e4 761#if (BITS_PER_LONG == 32)
e71a4783
SH		 762 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
763 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 764 else
e71a4783
SH		 765#endif
766 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
767 sock_set_flag(sk, SOCK_LINGER);
768 }
769 break;
770
771 case SO_BSDCOMPAT:
772 sock_warn_obsolete_bsdism("setsockopt");
773 break;
774
775 case SO_PASSCRED:
776 if (valbool)
777 set_bit(SOCK_PASSCRED, &sock->flags);
778 else
779 clear_bit(SOCK_PASSCRED, &sock->flags);
780 break;
781
782 case SO_TIMESTAMP:
92f37fd2 783 case SO_TIMESTAMPNS:
e71a4783 784 if (valbool) {
92f37fd2
ED		 785 if (optname == SO_TIMESTAMP)
786 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
787 else
788 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 789 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 790 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 791 } else {
e71a4783 792 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 793 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
794 }
e71a4783
SH		 795 break;
796
20d49473
PO		 797 case SO_TIMESTAMPING:
798 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 799 ret = -EINVAL;
20d49473
PO		 800 break;
801 }
802 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
803 val & SOF_TIMESTAMPING_TX_HARDWARE);
804 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
805 val & SOF_TIMESTAMPING_TX_SOFTWARE);
806 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
807 val & SOF_TIMESTAMPING_RX_HARDWARE);
808 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
809 sock_enable_timestamp(sk,
810 SOCK_TIMESTAMPING_RX_SOFTWARE);
811 else
812 sock_disable_timestamp(sk,
08e29af3 813 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 814 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
815 val & SOF_TIMESTAMPING_SOFTWARE);
816 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
817 val & SOF_TIMESTAMPING_SYS_HARDWARE);
818 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
819 val & SOF_TIMESTAMPING_RAW_HARDWARE);
820 break;
821
e71a4783
SH		 822 case SO_RCVLOWAT:
823 if (val < 0)
824 val = INT_MAX;
825 sk->sk_rcvlowat = val ? : 1;
826 break;
827
828 case SO_RCVTIMEO:
829 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
830 break;
831
832 case SO_SNDTIMEO:
833 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
834 break;
1da177e4 835
e71a4783
SH		 836 case SO_ATTACH_FILTER:
837 ret = -EINVAL;
838 if (optlen == sizeof(struct sock_fprog)) {
839 struct sock_fprog fprog;
1da177e4 840
e71a4783
SH		 841 ret = -EFAULT;
842 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 843 break;
e71a4783
SH		 844
845 ret = sk_attach_filter(&fprog, sk);
846 }
847 break;
848
849 case SO_DETACH_FILTER:
55b33325 850 ret = sk_detach_filter(sk);
e71a4783 851 break;
1da177e4 852
d59577b6
VB		 853 case SO_LOCK_FILTER:
854 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
855 ret = -EPERM;
856 else
857 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
858 break;
859
e71a4783
SH		 860 case SO_PASSSEC:
861 if (valbool)
862 set_bit(SOCK_PASSSEC, &sock->flags);
863 else
864 clear_bit(SOCK_PASSSEC, &sock->flags);
865 break;
4a19ec58 866 case SO_MARK:
5e1fccc0 867 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 868 ret = -EPERM;
2a91525c 869 else
4a19ec58 870 sk->sk_mark = val;
4a19ec58 871 break;
877ce7c1 872
1da177e4
LT		 873 /* We implement the SO_SNDLOWAT etc to
874 not be settable (1003.1g 5.3) */
3b885787 875 case SO_RXQ_OVFL:
8083f0fc 876 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 877 break;
6e3e939f
JB		 878
879 case SO_WIFI_STATUS:
880 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
881 break;
882
ef64a54f
PE		 883 case SO_PEEK_OFF:
884 if (sock->ops->set_peek_off)
12663bfc 885 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 886 else
887 ret = -EOPNOTSUPP;
888 break;
3bdc0eba
BG		 889
890 case SO_NOFCS:
891 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
892 break;
893
7d4c04fc
KJ		 894 case SO_SELECT_ERR_QUEUE:
895 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
896 break;
897
e0d1095a 898#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 899 case SO_BUSY_POLL:
dafcc438
ET		 900 /* allow unprivileged users to decrease the value */
901 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
902 ret = -EPERM;
903 else {
904 if (val < 0)
905 ret = -EINVAL;
906 else
907 sk->sk_ll_usec = val;
908 }
909 break;
910#endif
62748f32
ED		 911
912 case SO_MAX_PACING_RATE:
913 sk->sk_max_pacing_rate = val;
914 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
915 sk->sk_max_pacing_rate);
916 break;
917
e71a4783
SH		 918 default:
919 ret = -ENOPROTOOPT;
920 break;
4ec93edb 921 }
1da177e4
LT		 922 release_sock(sk);
923 return ret;
924}
2a91525c 925EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 926
927
3f551f94
EB		 928void cred_to_ucred(struct pid *pid, const struct cred *cred,
929 struct ucred *ucred)
930{
931 ucred->pid = pid_vnr(pid);
932 ucred->uid = ucred->gid = -1;
933 if (cred) {
934 struct user_namespace *current_ns = current_user_ns();
935
b2e4f544
EB		 936 ucred->uid = from_kuid_munged(current_ns, cred->euid);
937 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 938 }
939}
3924773a 940EXPORT_SYMBOL_GPL(cred_to_ucred);
3f551f94 941
1da177e4
LT		 942int sock_getsockopt(struct socket *sock, int level, int optname,
943 char __user *optval, int __user *optlen)
944{
945 struct sock *sk = sock->sk;
4ec93edb 946
e71a4783 947 union {
4ec93edb
YH		 948 int val;
949 struct linger ling;
1da177e4
LT		 950 struct timeval tm;
951 } v;
4ec93edb 952
4d0392be 953 int lv = sizeof(int);
1da177e4 954 int len;
4ec93edb 955
e71a4783 956 if (get_user(len, optlen))
4ec93edb 957 return -EFAULT;
e71a4783 958 if (len < 0)
1da177e4 959 return -EINVAL;
4ec93edb 960
50fee1de 961 memset(&v, 0, sizeof(v));
df0bca04 962
2a91525c 963 switch (optname) {
e71a4783
SH		 964 case SO_DEBUG:
965 v.val = sock_flag(sk, SOCK_DBG);
966 break;
967
968 case SO_DONTROUTE:
969 v.val = sock_flag(sk, SOCK_LOCALROUTE);
970 break;
971
972 case SO_BROADCAST:
1b23a5df 973 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 974 break;
975
976 case SO_SNDBUF:
977 v.val = sk->sk_sndbuf;
978 break;
979
980 case SO_RCVBUF:
981 v.val = sk->sk_rcvbuf;
982 break;
983
984 case SO_REUSEADDR:
985 v.val = sk->sk_reuse;
986 break;
987
055dc21a
TH		 988 case SO_REUSEPORT:
989 v.val = sk->sk_reuseport;
990 break;
991
e71a4783 992 case SO_KEEPALIVE:
1b23a5df 993 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 994 break;
995
996 case SO_TYPE:
997 v.val = sk->sk_type;
998 break;
999
49c794e9
JE		 1000 case SO_PROTOCOL:
1001 v.val = sk->sk_protocol;
1002 break;
1003
0d6038ee
JE		 1004 case SO_DOMAIN:
1005 v.val = sk->sk_family;
1006 break;
1007
e71a4783
SH		 1008 case SO_ERROR:
1009 v.val = -sock_error(sk);
2a91525c 1010 if (v.val == 0)
e71a4783
SH		 1011 v.val = xchg(&sk->sk_err_soft, 0);
1012 break;
1013
1014 case SO_OOBINLINE:
1b23a5df 1015 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1016 break;
1017
1018 case SO_NO_CHECK:
1019 v.val = sk->sk_no_check;
1020 break;
1021
1022 case SO_PRIORITY:
1023 v.val = sk->sk_priority;
1024 break;
1025
1026 case SO_LINGER:
1027 lv = sizeof(v.ling);
1b23a5df 1028 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1029 v.ling.l_linger = sk->sk_lingertime / HZ;
1030 break;
1031
1032 case SO_BSDCOMPAT:
1033 sock_warn_obsolete_bsdism("getsockopt");
1034 break;
1035
1036 case SO_TIMESTAMP:
92f37fd2
ED		 1037 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1038 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1039 break;
1040
1041 case SO_TIMESTAMPNS:
1042 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1043 break;
1044
20d49473
PO		 1045 case SO_TIMESTAMPING:
1046 v.val = 0;
1047 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
1048 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
1049 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
1050 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
1051 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
1052 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
1053 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1054 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
1055 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
1056 v.val |= SOF_TIMESTAMPING_SOFTWARE;
1057 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
1058 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
1059 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
1060 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
1061 break;
1062
e71a4783 1063 case SO_RCVTIMEO:
2a91525c 1064 lv = sizeof(struct timeval);
e71a4783
SH		 1065 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1066 v.tm.tv_sec = 0;
1067 v.tm.tv_usec = 0;
1068 } else {
1069 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1070 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1071 }
1072 break;
1073
1074 case SO_SNDTIMEO:
2a91525c 1075 lv = sizeof(struct timeval);
e71a4783
SH		 1076 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1077 v.tm.tv_sec = 0;
1078 v.tm.tv_usec = 0;
1079 } else {
1080 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1081 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1082 }
1083 break;
1da177e4 1084
e71a4783
SH		 1085 case SO_RCVLOWAT:
1086 v.val = sk->sk_rcvlowat;
1087 break;
1da177e4 1088
e71a4783 1089 case SO_SNDLOWAT:
2a91525c 1090 v.val = 1;
e71a4783 1091 break;
1da177e4 1092
e71a4783 1093 case SO_PASSCRED:
82981930 1094 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1095 break;
1da177e4 1096
e71a4783 1097 case SO_PEERCRED:
109f6e39
EB		 1098 {
1099 struct ucred peercred;
1100 if (len > sizeof(peercred))
1101 len = sizeof(peercred);
1102 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1103 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1104 return -EFAULT;
1105 goto lenout;
109f6e39 1106 }
1da177e4 1107
e71a4783
SH		 1108 case SO_PEERNAME:
1109 {
1110 char address[128];
1111
1112 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1113 return -ENOTCONN;
1114 if (lv < len)
1115 return -EINVAL;
1116 if (copy_to_user(optval, address, len))
1117 return -EFAULT;
1118 goto lenout;
1119 }
1da177e4 1120
e71a4783
SH		 1121 /* Dubious BSD thing... Probably nobody even uses it, but
1122 * the UNIX standard wants it for whatever reason... -DaveM
1123 */
1124 case SO_ACCEPTCONN:
1125 v.val = sk->sk_state == TCP_LISTEN;
1126 break;
1da177e4 1127
e71a4783 1128 case SO_PASSSEC:
82981930 1129 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1130 break;
877ce7c1 1131
e71a4783
SH		 1132 case SO_PEERSEC:
1133 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1134
4a19ec58
LAT		 1135 case SO_MARK:
1136 v.val = sk->sk_mark;
1137 break;
1138
3b885787 1139 case SO_RXQ_OVFL:
1b23a5df 1140 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1141 break;
1142
6e3e939f 1143 case SO_WIFI_STATUS:
1b23a5df 1144 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1145 break;
1146
ef64a54f
PE		 1147 case SO_PEEK_OFF:
1148 if (!sock->ops->set_peek_off)
1149 return -EOPNOTSUPP;
1150
1151 v.val = sk->sk_peek_off;
1152 break;
bc2f7996 1153 case SO_NOFCS:
1b23a5df 1154 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1155 break;
c91f6df2 1156
f7b86bfe 1157 case SO_BINDTODEVICE:
c91f6df2
BH		 1158 return sock_getbindtodevice(sk, optval, optlen, len);
1159
a8fc9277
PE		 1160 case SO_GET_FILTER:
1161 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1162 if (len < 0)
1163 return len;
1164
1165 goto lenout;
c91f6df2 1166
d59577b6
VB		 1167 case SO_LOCK_FILTER:
1168 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1169 break;
1170
7d4c04fc
KJ		 1171 case SO_SELECT_ERR_QUEUE:
1172 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1173 break;
1174
e0d1095a 1175#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1176 case SO_BUSY_POLL:
dafcc438
ET		 1177 v.val = sk->sk_ll_usec;
1178 break;
1179#endif
1180
62748f32
ED		 1181 case SO_MAX_PACING_RATE:
1182 v.val = sk->sk_max_pacing_rate;
1183 break;
1184
e71a4783
SH		 1185 default:
1186 return -ENOPROTOOPT;
1da177e4 1187 }
e71a4783 1188
1da177e4
LT		 1189 if (len > lv)
1190 len = lv;
1191 if (copy_to_user(optval, &v, len))
1192 return -EFAULT;
1193lenout:
4ec93edb
YH		 1194 if (put_user(len, optlen))
1195 return -EFAULT;
1196 return 0;
1da177e4
LT		 1197}
1198
a5b5bb9a
IM		 1199/*
1200 * Initialize an sk_lock.
1201 *
1202 * (We also register the sk_lock with the lock validator.)
1203 */
b6f99a21 1204static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1205{
ed07536e
PZ		 1206 sock_lock_init_class_and_name(sk,
1207 af_family_slock_key_strings[sk->sk_family],
1208 af_family_slock_keys + sk->sk_family,
1209 af_family_key_strings[sk->sk_family],
1210 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1211}
1212
4dc6dc71
ED		 1213/*
1214 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1215 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1216 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1217 */
f1a6c4da
PE		 1218static void sock_copy(struct sock *nsk, const struct sock *osk)
1219{
1220#ifdef CONFIG_SECURITY_NETWORK
1221 void *sptr = nsk->sk_security;
1222#endif
68835aba
ED		 1223 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1224
1225 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1226 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1227
f1a6c4da
PE		 1228#ifdef CONFIG_SECURITY_NETWORK
1229 nsk->sk_security = sptr;
1230 security_sk_clone(osk, nsk);
1231#endif
1232}
1233
fcbdf09d
OP		 1234void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1235{
1236 unsigned long nulls1, nulls2;
1237
1238 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1239 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1240 if (nulls1 > nulls2)
1241 swap(nulls1, nulls2);
1242
1243 if (nulls1 != 0)
1244 memset((char *)sk, 0, nulls1);
1245 memset((char *)sk + nulls1 + sizeof(void *), 0,
1246 nulls2 - nulls1 - sizeof(void *));
1247 memset((char *)sk + nulls2 + sizeof(void *), 0,
1248 size - nulls2 - sizeof(void *));
1249}
1250EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1251
2e4afe7b
PE		 1252static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1253 int family)
c308c1b2
PE		 1254{
1255 struct sock *sk;
1256 struct kmem_cache *slab;
1257
1258 slab = prot->slab;
e912b114
ED		 1259 if (slab != NULL) {
1260 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1261 if (!sk)
1262 return sk;
1263 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1264 if (prot->clear_sk)
1265 prot->clear_sk(sk, prot->obj_size);
1266 else
1267 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1268 }
fcbdf09d 1269 } else
c308c1b2
PE		 1270 sk = kmalloc(prot->obj_size, priority);
1271
2e4afe7b 1272 if (sk != NULL) {
a98b65a3
VN		 1273 kmemcheck_annotate_bitfield(sk, flags);
1274
2e4afe7b
PE		 1275 if (security_sk_alloc(sk, family, priority))
1276 goto out_free;
1277
1278 if (!try_module_get(prot->owner))
1279 goto out_free_sec;
e022f0b4 1280 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1281 }
1282
c308c1b2 1283 return sk;
2e4afe7b
PE		 1284
1285out_free_sec:
1286 security_sk_free(sk);
1287out_free:
1288 if (slab != NULL)
1289 kmem_cache_free(slab, sk);
1290 else
1291 kfree(sk);
1292 return NULL;
c308c1b2
PE		 1293}
1294
1295static void sk_prot_free(struct proto *prot, struct sock *sk)
1296{
1297 struct kmem_cache *slab;
2e4afe7b 1298 struct module *owner;
c308c1b2 1299
2e4afe7b 1300 owner = prot->owner;
c308c1b2 1301 slab = prot->slab;
2e4afe7b
PE		 1302
1303 security_sk_free(sk);
c308c1b2
PE		 1304 if (slab != NULL)
1305 kmem_cache_free(slab, sk);
1306 else
1307 kfree(sk);
2e4afe7b 1308 module_put(owner);
c308c1b2
PE		 1309}
1310
8fb974c9 1311#if IS_ENABLED(CONFIG_NET_CLS_CGROUP)
211d2f97 1312void sock_update_classid(struct sock *sk)
f8451725 1313{
1144182a 1314 u32 classid;
f8451725 1315
211d2f97 1316 classid = task_cls_classid(current);
3afa6d00 1317 if (classid != sk->sk_classid)
f8451725
HX		 1318 sk->sk_classid = classid;
1319}
82862742 1320EXPORT_SYMBOL(sock_update_classid);
8fb974c9 1321#endif
5bc1421e 1322
51e4e7fa 1323#if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
6ffd4641 1324void sock_update_netprioidx(struct sock *sk)
5bc1421e 1325{
5bc1421e
NH		 1326 if (in_interrupt())
1327 return;
2b73bc65 1328
6ffd4641 1329 sk->sk_cgrp_prioidx = task_netprioidx(current);
5bc1421e
NH		 1330}
1331EXPORT_SYMBOL_GPL(sock_update_netprioidx);
f8451725
HX		 1332#endif
1333
1da177e4
LT		 1334/**
1335 * sk_alloc - All socket objects are allocated here
c4ea43c5 1336 * @net: the applicable net namespace
4dc3b16b
PP		 1337 * @family: protocol family
1338 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1339 * @prot: struct proto associated with this new sock instance
1da177e4 1340 */
1b8d7ae4 1341struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1342 struct proto *prot)
1da177e4 1343{
c308c1b2 1344 struct sock *sk;
1da177e4 1345
154adbc8 1346 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1347 if (sk) {
154adbc8
PE		 1348 sk->sk_family = family;
1349 /*
1350 * See comment in struct sock definition to understand
1351 * why we need sk_prot_creator -acme
1352 */
1353 sk->sk_prot = sk->sk_prot_creator = prot;
1354 sock_lock_init(sk);
3b1e0a65 1355 sock_net_set(sk, get_net(net));
d66ee058 1356 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1357
211d2f97 1358 sock_update_classid(sk);
6ffd4641 1359 sock_update_netprioidx(sk);
1da177e4 1360 }
a79af59e 1361
2e4afe7b 1362 return sk;
1da177e4 1363}
2a91525c 1364EXPORT_SYMBOL(sk_alloc);
1da177e4 1365
2b85a34e 1366static void __sk_free(struct sock *sk)
1da177e4
LT		 1367{
1368 struct sk_filter *filter;
1da177e4
LT		 1369
1370 if (sk->sk_destruct)
1371 sk->sk_destruct(sk);
1372
a898def2
PM		 1373 filter = rcu_dereference_check(sk->sk_filter,
1374 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1375 if (filter) {
309dd5fc 1376 sk_filter_uncharge(sk, filter);
a9b3cd7f 1377 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1378 }
1379
08e29af3 1380 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1381
1382 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1383 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1384 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1385
109f6e39
EB		 1386 if (sk->sk_peer_cred)
1387 put_cred(sk->sk_peer_cred);
1388 put_pid(sk->sk_peer_pid);
3b1e0a65 1389 put_net(sock_net(sk));
c308c1b2 1390 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1391}
2b85a34e
ED		 1392
1393void sk_free(struct sock *sk)
1394{
1395 /*
25985edc 1396 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1397 * some packets are still in some tx queue.
1398 * If not null, sock_wfree() will call __sk_free(sk) later
1399 */
1400 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1401 __sk_free(sk);
1402}
2a91525c 1403EXPORT_SYMBOL(sk_free);
1da177e4 1404
edf02087 1405/*
25985edc
LDM		 1406 * Last sock_put should drop reference to sk->sk_net. It has already
1407 * been dropped in sk_change_net. Taking reference to stopping namespace
edf02087 1408 * is not an option.
25985edc 1409 * Take reference to a socket to remove it from hash _alive_ and after that
edf02087
DL		 1410 * destroy it in the context of init_net.
1411 */
1412void sk_release_kernel(struct sock *sk)
1413{
1414 if (sk == NULL || sk->sk_socket == NULL)
1415 return;
1416
1417 sock_hold(sk);
1418 sock_release(sk->sk_socket);
65a18ec5 1419 release_net(sock_net(sk));
3b1e0a65 1420 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1421 sock_put(sk);
1422}
45af1754 1423EXPORT_SYMBOL(sk_release_kernel);
edf02087 1424
475f1b52
SR		 1425static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1426{
1427 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1428 sock_update_memcg(newsk);
1429}
1430
e56c57d0
ED		 1431/**
1432 * sk_clone_lock - clone a socket, and lock its clone
1433 * @sk: the socket to clone
1434 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1435 *
1436 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1437 */
1438struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1439{
8fd1d178 1440 struct sock *newsk;
87d11ceb 1441
8fd1d178 1442 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1443 if (newsk != NULL) {
1444 struct sk_filter *filter;
1445
892c141e 1446 sock_copy(newsk, sk);
87d11ceb
ACM		 1447
1448 /* SANITY */
3b1e0a65 1449 get_net(sock_net(newsk));
87d11ceb
ACM		 1450 sk_node_init(&newsk->sk_node);
1451 sock_lock_init(newsk);
1452 bh_lock_sock(newsk);
fa438ccf 1453 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1454 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1455
1456 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1457 /*
1458 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1459 */
1460 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1461 atomic_set(&newsk->sk_omem_alloc, 0);
1462 skb_queue_head_init(&newsk->sk_receive_queue);
1463 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1464#ifdef CONFIG_NET_DMA
1465 skb_queue_head_init(&newsk->sk_async_wait_queue);
1466#endif
87d11ceb 1467
b6c6712a 1468 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1469 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1470 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1471 af_callback_keys + newsk->sk_family,
1472 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1473
1474 newsk->sk_dst_cache = NULL;
1475 newsk->sk_wmem_queued = 0;
1476 newsk->sk_forward_alloc = 0;
1477 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1478 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1479
1480 sock_reset_flag(newsk, SOCK_DONE);
1481 skb_queue_head_init(&newsk->sk_error_queue);
1482
0d7da9dd 1483 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb
ACM		 1484 if (filter != NULL)
1485 sk_filter_charge(newsk, filter);
1486
1487 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1488 /* It is still raw copy of parent, so invalidate
1489 * destructor and make plain sk_free() */
1490 newsk->sk_destruct = NULL;
b0691c8e 1491 bh_unlock_sock(newsk);
87d11ceb
ACM		 1492 sk_free(newsk);
1493 newsk = NULL;
1494 goto out;
1495 }
1496
1497 newsk->sk_err = 0;
1498 newsk->sk_priority = 0;
4dc6dc71
ED		 1499 /*
1500 * Before updating sk_refcnt, we must commit prior changes to memory
1501 * (Documentation/RCU/rculist_nulls.txt for details)
1502 */
1503 smp_wmb();
87d11ceb
ACM		 1504 atomic_set(&newsk->sk_refcnt, 2);
1505
1506 /*
1507 * Increment the counter in the same struct proto as the master
1508 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1509 * is the same as sk->sk_prot->socks, as this field was copied
1510 * with memcpy).
1511 *
1512 * This _changes_ the previous behaviour, where
1513 * tcp_create_openreq_child always was incrementing the
1514 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1515 * to be taken into account in all callers. -acme
1516 */
1517 sk_refcnt_debug_inc(newsk);
972692e0 1518 sk_set_socket(newsk, NULL);
43815482 1519 newsk->sk_wq = NULL;
87d11ceb 1520
f3f511e1
GC		 1521 sk_update_clone(sk, newsk);
1522
87d11ceb 1523 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1524 sk_sockets_allocated_inc(newsk);
704da560 1525
08e29af3 1526 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1527 net_enable_timestamp();
87d11ceb
ACM		 1528 }
1529out:
1530 return newsk;
1531}
e56c57d0 1532EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1533
9958089a
AK		 1534void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1535{
1536 __sk_dst_set(sk, dst);
1537 sk->sk_route_caps = dst->dev->features;
1538 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1539 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1540 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1541 if (sk_can_gso(sk)) {
82cc1a7a 1542 if (dst->header_len) {
9958089a 1543 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1544 } else {
9958089a 1545 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1546 sk->sk_gso_max_size = dst->dev->gso_max_size;
1485348d 1547 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
82cc1a7a 1548 }
9958089a
AK		 1549 }
1550}
1551EXPORT_SYMBOL_GPL(sk_setup_caps);
1552
1da177e4
LT		 1553/*
1554 * Simple resource managers for sockets.
1555 */
1556
1557
4ec93edb
YH		 1558/*
1559 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1560 */
1561void sock_wfree(struct sk_buff *skb)
1562{
1563 struct sock *sk = skb->sk;
d99927f4 1564 unsigned int len = skb->truesize;
1da177e4 1565
d99927f4
ED		 1566 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1567 /*
1568 * Keep a reference on sk_wmem_alloc, this will be released
1569 * after sk_write_space() call
1570 */
1571 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1572 sk->sk_write_space(sk);
d99927f4
ED		 1573 len = 1;
1574 }
2b85a34e 1575 /*
d99927f4
ED		 1576 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1577 * could not do because of in-flight packets
2b85a34e 1578 */
d99927f4 1579 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1580 __sk_free(sk);
1da177e4 1581}
2a91525c 1582EXPORT_SYMBOL(sock_wfree);
1da177e4 1583
f2f872f9
ED		 1584void skb_orphan_partial(struct sk_buff *skb)
1585{
1586 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1587 * so we do not completely orphan skb, but transfert all
1588 * accounted bytes but one, to avoid unexpected reorders.
1589 */
1590 if (skb->destructor == sock_wfree
1591#ifdef CONFIG_INET
1592 || skb->destructor == tcp_wfree
1593#endif
1594 ) {
1595 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1596 skb->truesize = 1;
1597 } else {
1598 skb_orphan(skb);
1599 }
1600}
1601EXPORT_SYMBOL(skb_orphan_partial);
1602
4ec93edb
YH		 1603/*
1604 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1605 */
1606void sock_rfree(struct sk_buff *skb)
1607{
1608 struct sock *sk = skb->sk;
d361fd59 1609 unsigned int len = skb->truesize;
1da177e4 1610
d361fd59
ED		 1611 atomic_sub(len, &sk->sk_rmem_alloc);
1612 sk_mem_uncharge(sk, len);
1da177e4 1613}
2a91525c 1614EXPORT_SYMBOL(sock_rfree);
1da177e4 1615
41063e9d
DM		 1616void sock_edemux(struct sk_buff *skb)
1617{
e812347c
ED		 1618 struct sock *sk = skb->sk;
1619
1c463e57 1620#ifdef CONFIG_INET
e812347c
ED		 1621 if (sk->sk_state == TCP_TIME_WAIT)
1622 inet_twsk_put(inet_twsk(sk));
1623 else
1c463e57 1624#endif
e812347c 1625 sock_put(sk);
41063e9d
DM		 1626}
1627EXPORT_SYMBOL(sock_edemux);
1da177e4 1628
976d0201 1629kuid_t sock_i_uid(struct sock *sk)
1da177e4 1630{
976d0201 1631 kuid_t uid;
1da177e4 1632
f064af1e 1633 read_lock_bh(&sk->sk_callback_lock);
976d0201 1634 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1635 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1636 return uid;
1637}
2a91525c 1638EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1639
1640unsigned long sock_i_ino(struct sock *sk)
1641{
1642 unsigned long ino;
1643
f064af1e 1644 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1645 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1646 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1647 return ino;
1648}
2a91525c 1649EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1650
1651/*
1652 * Allocate a skb from the socket's send buffer.
1653 */
86a76caf 1654struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1655 gfp_t priority)
1da177e4
LT		 1656{
1657 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1658 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1659 if (skb) {
1660 skb_set_owner_w(skb, sk);
1661 return skb;
1662 }
1663 }
1664 return NULL;
1665}
2a91525c 1666EXPORT_SYMBOL(sock_wmalloc);
1da177e4
LT		 1667
1668/*
1669 * Allocate a skb from the socket's receive buffer.
4ec93edb 1670 */
86a76caf 1671struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1672 gfp_t priority)
1da177e4
LT		 1673{
1674 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1675 struct sk_buff *skb = alloc_skb(size, priority);
1676 if (skb) {
1677 skb_set_owner_r(skb, sk);
1678 return skb;
1679 }
1680 }
1681 return NULL;
1682}
1683
4ec93edb 1684/*
1da177e4 1685 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1686 */
dd0fc66f 1687void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1688{
95c96174 1689 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1690 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1691 void *mem;
1692 /* First do the add, to avoid the race if kmalloc
4ec93edb 1693 * might sleep.
1da177e4
LT		 1694 */
1695 atomic_add(size, &sk->sk_omem_alloc);
1696 mem = kmalloc(size, priority);
1697 if (mem)
1698 return mem;
1699 atomic_sub(size, &sk->sk_omem_alloc);
1700 }
1701 return NULL;
1702}
2a91525c 1703EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1704
1705/*
1706 * Free an option memory block.
1707 */
1708void sock_kfree_s(struct sock *sk, void *mem, int size)
1709{
1710 kfree(mem);
1711 atomic_sub(size, &sk->sk_omem_alloc);
1712}
2a91525c 1713EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1714
1715/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1716 I think, these locks should be removed for datagram sockets.
1717 */
2a91525c 1718static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1719{
1720 DEFINE_WAIT(wait);
1721
1722 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1723 for (;;) {
1724 if (!timeo)
1725 break;
1726 if (signal_pending(current))
1727 break;
1728 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1729 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1730 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1731 break;
1732 if (sk->sk_shutdown & SEND_SHUTDOWN)
1733 break;
1734 if (sk->sk_err)
1735 break;
1736 timeo = schedule_timeout(timeo);
1737 }
aa395145 1738 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1739 return timeo;
1740}
1741
1742
1743/*
1744 * Generic send/receive buffer handlers
1745 */
1746
4cc7f68d
HX		 1747struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1748 unsigned long data_len, int noblock,
28d64271 1749 int *errcode, int max_page_order)
1da177e4 1750{
28d64271
ED		 1751 struct sk_buff *skb = NULL;
1752 unsigned long chunk;
7d877f3b 1753 gfp_t gfp_mask;
1da177e4
LT		 1754 long timeo;
1755 int err;
cc9b17ad 1756 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
28d64271
ED		 1757 struct page *page;
1758 int i;
cc9b17ad
JW		 1759
1760 err = -EMSGSIZE;
1761 if (npages > MAX_SKB_FRAGS)
1762 goto failure;
1da177e4 1763
1da177e4 1764 timeo = sock_sndtimeo(sk, noblock);
28d64271 1765 while (!skb) {
1da177e4
LT		 1766 err = sock_error(sk);
1767 if (err != 0)
1768 goto failure;
1769
1770 err = -EPIPE;
1771 if (sk->sk_shutdown & SEND_SHUTDOWN)
1772 goto failure;
1773
28d64271
ED		 1774 if (atomic_read(&sk->sk_wmem_alloc) >= sk->sk_sndbuf) {
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 continue;
1784 }
1da177e4 1785
28d64271
ED		 1786 err = -ENOBUFS;
1787 gfp_mask = sk->sk_allocation;
1788 if (gfp_mask & __GFP_WAIT)
1789 gfp_mask |= __GFP_REPEAT;
1790
1791 skb = alloc_skb(header_len, gfp_mask);
1792 if (!skb)
1da177e4 1793 goto failure;
28d64271
ED		 1794
1795 skb->truesize += data_len;
1796
1797 for (i = 0; npages > 0; i++) {
1798 int order = max_page_order;
1799
1800 while (order) {
1801 if (npages >= 1 << order) {
1802 page = alloc_pages(sk->sk_allocation |
1803 __GFP_COMP | __GFP_NOWARN,
1804 order);
1805 if (page)
1806 goto fill_page;
1807 }
1808 order--;
1809 }
1810 page = alloc_page(sk->sk_allocation);
1811 if (!page)
1812 goto failure;
1813fill_page:
1814 chunk = min_t(unsigned long, data_len,
1815 PAGE_SIZE << order);
1816 skb_fill_page_desc(skb, i, page, 0, chunk);
1817 data_len -= chunk;
1818 npages -= 1 << order;
1da177e4 1819 }
1da177e4
LT		 1820 }
1821
1822 skb_set_owner_w(skb, sk);
1823 return skb;
1824
1825interrupted:
1826 err = sock_intr_errno(timeo);
1827failure:
28d64271 1828 kfree_skb(skb);
1da177e4
LT		 1829 *errcode = err;
1830 return NULL;
1831}
4cc7f68d 1832EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1833
4ec93edb 1834struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1835 int noblock, int *errcode)
1836{
28d64271 1837 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1838}
2a91525c 1839EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1840
5640f768
ED		 1841/* On 32bit arches, an skb frag is limited to 2^15 */
1842#define SKB_FRAG_PAGE_ORDER get_order(32768)
1843
400dfd3a
ED		 1844/**
1845 * skb_page_frag_refill - check that a page_frag contains enough room
1846 * @sz: minimum size of the fragment we want to get
1847 * @pfrag: pointer to page_frag
1848 * @prio: priority for memory allocation
1849 *
1850 * Note: While this allocator tries to use high order pages, there is
1851 * no guarantee that allocations succeed. Therefore, @sz MUST be
1852 * less or equal than PAGE_SIZE.
1853 */
1854bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t prio)
5640f768
ED		 1855{
1856 int order;
1857
1858 if (pfrag->page) {
1859 if (atomic_read(&pfrag->page->_count) == 1) {
1860 pfrag->offset = 0;
1861 return true;
1862 }
400dfd3a 1863 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1864 return true;
1865 put_page(pfrag->page);
1866 }
1867
1868 /* We restrict high order allocations to users that can afford to wait */
400dfd3a 1869 order = (prio & __GFP_WAIT) ? SKB_FRAG_PAGE_ORDER : 0;
5640f768
ED		 1870
1871 do {
400dfd3a 1872 gfp_t gfp = prio;
5640f768
ED		 1873
1874 if (order)
1875 gfp |= __GFP_COMP | __GFP_NOWARN;
1876 pfrag->page = alloc_pages(gfp, order);
1877 if (likely(pfrag->page)) {
1878 pfrag->offset = 0;
1879 pfrag->size = PAGE_SIZE << order;
1880 return true;
1881 }
1882 } while (--order >= 0);
1883
400dfd3a
ED		 1884 return false;
1885}
1886EXPORT_SYMBOL(skb_page_frag_refill);
1887
1888bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1889{
1890 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1891 return true;
1892
5640f768
ED		 1893 sk_enter_memory_pressure(sk);
1894 sk_stream_moderate_sndbuf(sk);
1895 return false;
1896}
1897EXPORT_SYMBOL(sk_page_frag_refill);
1898
1da177e4 1899static void __lock_sock(struct sock *sk)
f39234d6
NK		 1900 __releases(&sk->sk_lock.slock)
1901 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1902{
1903 DEFINE_WAIT(wait);
1904
e71a4783 1905 for (;;) {
1da177e4
LT		 1906 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1907 TASK_UNINTERRUPTIBLE);
1908 spin_unlock_bh(&sk->sk_lock.slock);
1909 schedule();
1910 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1911 if (!sock_owned_by_user(sk))
1da177e4
LT		 1912 break;
1913 }
1914 finish_wait(&sk->sk_lock.wq, &wait);
1915}
1916
1917static void __release_sock(struct sock *sk)
f39234d6
NK		 1918 __releases(&sk->sk_lock.slock)
1919 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1920{
1921 struct sk_buff *skb = sk->sk_backlog.head;
1922
1923 do {
1924 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1925 bh_unlock_sock(sk);
1926
1927 do {
1928 struct sk_buff *next = skb->next;
1929
e4cbb02a 1930 prefetch(next);
7fee226a 1931 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1932 skb->next = NULL;
c57943a1 1933 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1934
1935 /*
1936 * We are in process context here with softirqs
1937 * disabled, use cond_resched_softirq() to preempt.
1938 * This is safe to do because we've taken the backlog
1939 * queue private:
1940 */
1941 cond_resched_softirq();
1942
1943 skb = next;
1944 } while (skb != NULL);
1945
1946 bh_lock_sock(sk);
e71a4783 1947 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1948
1949 /*
1950 * Doing the zeroing here guarantee we can not loop forever
1951 * while a wild producer attempts to flood us.
1952 */
1953 sk->sk_backlog.len = 0;
1da177e4
LT		 1954}
1955
1956/**
1957 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1958 * @sk: sock to wait on
1959 * @timeo: for how long
1da177e4
LT		 1960 *
1961 * Now socket state including sk->sk_err is changed only under lock,
1962 * hence we may omit checks after joining wait queue.
1963 * We check receive queue before schedule() only as optimization;
1964 * it is very likely that release_sock() added new data.
1965 */
1966int sk_wait_data(struct sock *sk, long *timeo)
1967{
1968 int rc;
1969 DEFINE_WAIT(wait);
1970
aa395145 1971 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1972 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1973 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1974 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1975 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1976 return rc;
1977}
1da177e4
LT		 1978EXPORT_SYMBOL(sk_wait_data);
1979
3ab224be
HA		 1980/**
1981 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1982 * @sk: socket
1983 * @size: memory size to allocate
1984 * @kind: allocation type
1985 *
1986 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1987 * rmem allocation. This function assumes that protocols which have
1988 * memory_pressure use sk_wmem_queued as write buffer accounting.
1989 */
1990int __sk_mem_schedule(struct sock *sk, int size, int kind)
1991{
1992 struct proto *prot = sk->sk_prot;
1993 int amt = sk_mem_pages(size);
8d987e5c 1994 long allocated;
e1aab161 1995 int parent_status = UNDER_LIMIT;
3ab224be
HA		 1996
1997 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 1998
e1aab161 1999 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 2000
2001 /* Under limit. */
e1aab161
GC		 2002 if (parent_status == UNDER_LIMIT &&
2003 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2004 sk_leave_memory_pressure(sk);
3ab224be
HA		 2005 return 1;
2006 }
2007
e1aab161
GC		 2008 /* Under pressure. (we or our parents) */
2009 if ((parent_status > SOFT_LIMIT) ||
2010 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2011 sk_enter_memory_pressure(sk);
3ab224be 2012
e1aab161
GC		 2013 /* Over hard limit (we or our parents) */
2014 if ((parent_status == OVER_LIMIT) ||
2015 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 2016 goto suppress_allocation;
2017
2018 /* guarantee minimum buffer size under pressure */
2019 if (kind == SK_MEM_RECV) {
2020 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2021 return 1;
180d8cd9 2022
3ab224be
HA		 2023 } else { /* SK_MEM_SEND */
2024 if (sk->sk_type == SOCK_STREAM) {
2025 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2026 return 1;
2027 } else if (atomic_read(&sk->sk_wmem_alloc) <
2028 prot->sysctl_wmem[0])
2029 return 1;
2030 }
2031
180d8cd9 2032 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2033 int alloc;
2034
180d8cd9 2035 if (!sk_under_memory_pressure(sk))
1748376b 2036 return 1;
180d8cd9
GC		 2037 alloc = sk_sockets_allocated_read_positive(sk);
2038 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2039 sk_mem_pages(sk->sk_wmem_queued +
2040 atomic_read(&sk->sk_rmem_alloc) +
2041 sk->sk_forward_alloc))
2042 return 1;
2043 }
2044
2045suppress_allocation:
2046
2047 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2048 sk_stream_moderate_sndbuf(sk);
2049
2050 /* Fail only if socket is _under_ its sndbuf.
2051 * In this case we cannot block, so that we have to fail.
2052 */
2053 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2054 return 1;
2055 }
2056
3847ce32
SM		 2057 trace_sock_exceed_buf_limit(sk, prot, allocated);
2058
3ab224be
HA		 2059 /* Alas. Undo changes. */
2060 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2061
0e90b31f 2062 sk_memory_allocated_sub(sk, amt);
180d8cd9 2063
3ab224be
HA		 2064 return 0;
2065}
3ab224be
HA		 2066EXPORT_SYMBOL(__sk_mem_schedule);
2067
2068/**
2069 * __sk_reclaim - reclaim memory_allocated
2070 * @sk: socket
2071 */
2072void __sk_mem_reclaim(struct sock *sk)
2073{
180d8cd9 2074 sk_memory_allocated_sub(sk,
0e90b31f 2075 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
3ab224be
HA		 2076 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
2077
180d8cd9
GC		 2078 if (sk_under_memory_pressure(sk) &&
2079 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2080 sk_leave_memory_pressure(sk);
3ab224be 2081}
3ab224be
HA		 2082EXPORT_SYMBOL(__sk_mem_reclaim);
2083
2084
1da177e4
LT		 2085/*
2086 * Set of default routines for initialising struct proto_ops when
2087 * the protocol does not support a particular function. In certain
2088 * cases where it makes no sense for a protocol to have a "do nothing"
2089 * function, some default processing is provided.
2090 */
2091
2092int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2093{
2094 return -EOPNOTSUPP;
2095}
2a91525c 2096EXPORT_SYMBOL(sock_no_bind);
1da177e4 2097
4ec93edb 2098int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2099 int len, int flags)
2100{
2101 return -EOPNOTSUPP;
2102}
2a91525c 2103EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2104
2105int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2106{
2107 return -EOPNOTSUPP;
2108}
2a91525c 2109EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2110
2111int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2112{
2113 return -EOPNOTSUPP;
2114}
2a91525c 2115EXPORT_SYMBOL(sock_no_accept);
1da177e4 2116
4ec93edb 2117int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2118 int *len, int peer)
2119{
2120 return -EOPNOTSUPP;
2121}
2a91525c 2122EXPORT_SYMBOL(sock_no_getname);
1da177e4 2123
2a91525c 2124unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2125{
2126 return 0;
2127}
2a91525c 2128EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2129
2130int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2131{
2132 return -EOPNOTSUPP;
2133}
2a91525c 2134EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2135
2136int sock_no_listen(struct socket *sock, int backlog)
2137{
2138 return -EOPNOTSUPP;
2139}
2a91525c 2140EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2141
2142int sock_no_shutdown(struct socket *sock, int how)
2143{
2144 return -EOPNOTSUPP;
2145}
2a91525c 2146EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2147
2148int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2149 char __user *optval, unsigned int optlen)
1da177e4
LT		 2150{
2151 return -EOPNOTSUPP;
2152}
2a91525c 2153EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2154
2155int sock_no_getsockopt(struct socket *sock, int level, int optname,
2156 char __user *optval, int __user *optlen)
2157{
2158 return -EOPNOTSUPP;
2159}
2a91525c 2160EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 2161
2162int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2163 size_t len)
2164{
2165 return -EOPNOTSUPP;
2166}
2a91525c 2167EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 2168
2169int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2170 size_t len, int flags)
2171{
2172 return -EOPNOTSUPP;
2173}
2a91525c 2174EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2175
2176int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2177{
2178 /* Mirror missing mmap method error code */
2179 return -ENODEV;
2180}
2a91525c 2181EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2182
2183ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2184{
2185 ssize_t res;
2186 struct msghdr msg = {.msg_flags = flags};
2187 struct kvec iov;
2188 char *kaddr = kmap(page);
2189 iov.iov_base = kaddr + offset;
2190 iov.iov_len = size;
2191 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2192 kunmap(page);
2193 return res;
2194}
2a91525c 2195EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2196
2197/*
2198 * Default Socket Callbacks
2199 */
2200
2201static void sock_def_wakeup(struct sock *sk)
2202{
43815482
ED		 2203 struct socket_wq *wq;
2204
2205 rcu_read_lock();
2206 wq = rcu_dereference(sk->sk_wq);
2207 if (wq_has_sleeper(wq))
2208 wake_up_interruptible_all(&wq->wait);
2209 rcu_read_unlock();
1da177e4
LT		 2210}
2211
2212static void sock_def_error_report(struct sock *sk)
2213{
43815482
ED		 2214 struct socket_wq *wq;
2215
2216 rcu_read_lock();
2217 wq = rcu_dereference(sk->sk_wq);
2218 if (wq_has_sleeper(wq))
2219 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2220 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2221 rcu_read_unlock();
1da177e4
LT		 2222}
2223
2224static void sock_def_readable(struct sock *sk, int len)
2225{
43815482
ED		 2226 struct socket_wq *wq;
2227
2228 rcu_read_lock();
2229 wq = rcu_dereference(sk->sk_wq);
2230 if (wq_has_sleeper(wq))
2c6607c6 2231 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2232 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2233 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2234 rcu_read_unlock();
1da177e4
LT		 2235}
2236
2237static void sock_def_write_space(struct sock *sk)
2238{
43815482
ED		 2239 struct socket_wq *wq;
2240
2241 rcu_read_lock();
1da177e4
LT		 2242
2243 /* Do not wake up a writer until he can make "significant"
2244 * progress. --DaveM
2245 */
e71a4783 2246 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2247 wq = rcu_dereference(sk->sk_wq);
2248 if (wq_has_sleeper(wq))
2249 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2250 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2251
2252 /* Should agree with poll, otherwise some programs break */
2253 if (sock_writeable(sk))
8d8ad9d7 2254 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2255 }
2256
43815482 2257 rcu_read_unlock();
1da177e4
LT		 2258}
2259
2260static void sock_def_destruct(struct sock *sk)
2261{
a51482bd 2262 kfree(sk->sk_protinfo);
1da177e4
LT		 2263}
2264
2265void sk_send_sigurg(struct sock *sk)
2266{
2267 if (sk->sk_socket && sk->sk_socket->file)
2268 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2269 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2270}
2a91525c 2271EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2272
2273void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2274 unsigned long expires)
2275{
2276 if (!mod_timer(timer, expires))
2277 sock_hold(sk);
2278}
1da177e4
LT		 2279EXPORT_SYMBOL(sk_reset_timer);
2280
2281void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2282{
25cc4ae9 2283 if (del_timer(timer))
1da177e4
LT		 2284 __sock_put(sk);
2285}
1da177e4
LT		 2286EXPORT_SYMBOL(sk_stop_timer);
2287
2288void sock_init_data(struct socket *sock, struct sock *sk)
2289{
2290 skb_queue_head_init(&sk->sk_receive_queue);
2291 skb_queue_head_init(&sk->sk_write_queue);
2292 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 2293#ifdef CONFIG_NET_DMA
2294 skb_queue_head_init(&sk->sk_async_wait_queue);
2295#endif
1da177e4
LT		 2296
2297 sk->sk_send_head = NULL;
2298
2299 init_timer(&sk->sk_timer);
4ec93edb 2300
1da177e4
LT		 2301 sk->sk_allocation = GFP_KERNEL;
2302 sk->sk_rcvbuf = sysctl_rmem_default;
2303 sk->sk_sndbuf = sysctl_wmem_default;
2304 sk->sk_state = TCP_CLOSE;
972692e0 2305 sk_set_socket(sk, sock);
1da177e4
LT		 2306
2307 sock_set_flag(sk, SOCK_ZAPPED);
2308
e71a4783 2309 if (sock) {
1da177e4 2310 sk->sk_type = sock->type;
43815482 2311 sk->sk_wq = sock->wq;
1da177e4
LT		 2312 sock->sk = sk;
2313 } else
43815482 2314 sk->sk_wq = NULL;
1da177e4 2315
b6c6712a 2316 spin_lock_init(&sk->sk_dst_lock);
1da177e4 2317 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2318 lockdep_set_class_and_name(&sk->sk_callback_lock,
2319 af_callback_keys + sk->sk_family,
2320 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2321
2322 sk->sk_state_change = sock_def_wakeup;
2323 sk->sk_data_ready = sock_def_readable;
2324 sk->sk_write_space = sock_def_write_space;
2325 sk->sk_error_report = sock_def_error_report;
2326 sk->sk_destruct = sock_def_destruct;
2327
5640f768
ED		 2328 sk->sk_frag.page = NULL;
2329 sk->sk_frag.offset = 0;
ef64a54f 2330 sk->sk_peek_off = -1;
1da177e4 2331
109f6e39
EB		 2332 sk->sk_peer_pid = NULL;
2333 sk->sk_peer_cred = NULL;
1da177e4
LT		 2334 sk->sk_write_pending = 0;
2335 sk->sk_rcvlowat = 1;
2336 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2337 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2338
f37f0afb 2339 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2340
e0d1095a 2341#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2342 sk->sk_napi_id = 0;
64b0dc51 2343 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2344#endif
2345
62748f32 2346 sk->sk_max_pacing_rate = ~0U;
7eec4174 2347 sk->sk_pacing_rate = ~0U;
4dc6dc71
ED		 2348 /*
2349 * Before updating sk_refcnt, we must commit prior changes to memory
2350 * (Documentation/RCU/rculist_nulls.txt for details)
2351 */
2352 smp_wmb();
1da177e4 2353 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2354 atomic_set(&sk->sk_drops, 0);
1da177e4 2355}
2a91525c 2356EXPORT_SYMBOL(sock_init_data);
1da177e4 2357
b5606c2d 2358void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2359{
2360 might_sleep();
a5b5bb9a 2361 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2362 if (sk->sk_lock.owned)
1da177e4 2363 __lock_sock(sk);
d2e9117c 2364 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2365 spin_unlock(&sk->sk_lock.slock);
2366 /*
2367 * The sk_lock has mutex_lock() semantics here:
2368 */
fcc70d5f 2369 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2370 local_bh_enable();
1da177e4 2371}
fcc70d5f 2372EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2373
b5606c2d 2374void release_sock(struct sock *sk)
1da177e4 2375{
a5b5bb9a
IM		 2376 /*
2377 * The sk_lock has mutex_unlock() semantics:
2378 */
2379 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2380
2381 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2382 if (sk->sk_backlog.tail)
2383 __release_sock(sk);
46d3ceab
ED		 2384
2385 if (sk->sk_prot->release_cb)
2386 sk->sk_prot->release_cb(sk);
2387
d2e9117c 2388 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 2389 if (waitqueue_active(&sk->sk_lock.wq))
2390 wake_up(&sk->sk_lock.wq);
2391 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2392}
2393EXPORT_SYMBOL(release_sock);
2394
8a74ad60
ED		 2395/**
2396 * lock_sock_fast - fast version of lock_sock
2397 * @sk: socket
2398 *
2399 * This version should be used for very small section, where process wont block
2400 * return false if fast path is taken
2401 * sk_lock.slock locked, owned = 0, BH disabled
2402 * return true if slow path is taken
2403 * sk_lock.slock unlocked, owned = 1, BH enabled
2404 */
2405bool lock_sock_fast(struct sock *sk)
2406{
2407 might_sleep();
2408 spin_lock_bh(&sk->sk_lock.slock);
2409
2410 if (!sk->sk_lock.owned)
2411 /*
2412 * Note : We must disable BH
2413 */
2414 return false;
2415
2416 __lock_sock(sk);
2417 sk->sk_lock.owned = 1;
2418 spin_unlock(&sk->sk_lock.slock);
2419 /*
2420 * The sk_lock has mutex_lock() semantics here:
2421 */
2422 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2423 local_bh_enable();
2424 return true;
2425}
2426EXPORT_SYMBOL(lock_sock_fast);
2427
1da177e4 2428int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2429{
b7aa0bf7 2430 struct timeval tv;
1da177e4 2431 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2432 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2433 tv = ktime_to_timeval(sk->sk_stamp);
2434 if (tv.tv_sec == -1)
1da177e4 2435 return -ENOENT;
b7aa0bf7
ED		 2436 if (tv.tv_sec == 0) {
2437 sk->sk_stamp = ktime_get_real();
2438 tv = ktime_to_timeval(sk->sk_stamp);
2439 }
2440 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2441}
1da177e4
LT		 2442EXPORT_SYMBOL(sock_get_timestamp);
2443
ae40eb1e
ED		 2444int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2445{
2446 struct timespec ts;
2447 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2448 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2449 ts = ktime_to_timespec(sk->sk_stamp);
2450 if (ts.tv_sec == -1)
2451 return -ENOENT;
2452 if (ts.tv_sec == 0) {
2453 sk->sk_stamp = ktime_get_real();
2454 ts = ktime_to_timespec(sk->sk_stamp);
2455 }
2456 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2457}
2458EXPORT_SYMBOL(sock_get_timestampns);
2459
20d49473 2460void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2461{
20d49473 2462 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2463 unsigned long previous_flags = sk->sk_flags;
2464
20d49473
PO		 2465 sock_set_flag(sk, flag);
2466 /*
2467 * we just set one of the two flags which require net
2468 * time stamping, but time stamping might have been on
2469 * already because of the other one
2470 */
08e29af3 2471 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2472 net_enable_timestamp();
1da177e4
LT		 2473 }
2474}
1da177e4 2475
cb820f8e
RC		 2476int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2477 int level, int type)
2478{
2479 struct sock_exterr_skb *serr;
2480 struct sk_buff *skb, *skb2;
2481 int copied, err;
2482
2483 err = -EAGAIN;
2484 skb = skb_dequeue(&sk->sk_error_queue);
2485 if (skb == NULL)
2486 goto out;
2487
2488 copied = skb->len;
2489 if (copied > len) {
2490 msg->msg_flags |= MSG_TRUNC;
2491 copied = len;
2492 }
2493 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2494 if (err)
2495 goto out_free_skb;
2496
2497 sock_recv_timestamp(msg, sk, skb);
2498
2499 serr = SKB_EXT_ERR(skb);
2500 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2501
2502 msg->msg_flags |= MSG_ERRQUEUE;
2503 err = copied;
2504
2505 /* Reset and regenerate socket error */
2506 spin_lock_bh(&sk->sk_error_queue.lock);
2507 sk->sk_err = 0;
2508 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
2509 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
2510 spin_unlock_bh(&sk->sk_error_queue.lock);
2511 sk->sk_error_report(sk);
2512 } else
2513 spin_unlock_bh(&sk->sk_error_queue.lock);
2514
2515out_free_skb:
2516 kfree_skb(skb);
2517out:
2518 return err;
2519}
2520EXPORT_SYMBOL(sock_recv_errqueue);
2521
1da177e4
LT		 2522/*
2523 * Get a socket option on an socket.
2524 *
2525 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2526 * asynchronous errors should be reported by getsockopt. We assume
2527 * this means if you specify SO_ERROR (otherwise whats the point of it).
2528 */
2529int sock_common_getsockopt(struct socket *sock, int level, int optname,
2530 char __user *optval, int __user *optlen)
2531{
2532 struct sock *sk = sock->sk;
2533
2534 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2535}
1da177e4
LT		 2536EXPORT_SYMBOL(sock_common_getsockopt);
2537
3fdadf7d 2538#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2539int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2540 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2541{
2542 struct sock *sk = sock->sk;
2543
1e51f951 2544 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2545 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2546 optval, optlen);
3fdadf7d
DM		 2547 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2548}
2549EXPORT_SYMBOL(compat_sock_common_getsockopt);
2550#endif
2551
1da177e4
LT		 2552int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2553 struct msghdr *msg, size_t size, int flags)
2554{
2555 struct sock *sk = sock->sk;
2556 int addr_len = 0;
2557 int err;
2558
2559 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2560 flags & ~MSG_DONTWAIT, &addr_len);
2561 if (err >= 0)
2562 msg->msg_namelen = addr_len;
2563 return err;
2564}
1da177e4
LT		 2565EXPORT_SYMBOL(sock_common_recvmsg);
2566
2567/*
2568 * Set socket options on an inet socket.
2569 */
2570int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2571 char __user *optval, unsigned int optlen)
1da177e4
LT		 2572{
2573 struct sock *sk = sock->sk;
2574
2575 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2576}
1da177e4
LT		 2577EXPORT_SYMBOL(sock_common_setsockopt);
2578
3fdadf7d 2579#ifdef CONFIG_COMPAT
543d9cfe 2580int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2581 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2582{
2583 struct sock *sk = sock->sk;
2584
543d9cfe
ACM		 2585 if (sk->sk_prot->compat_setsockopt != NULL)
2586 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2587 optval, optlen);
3fdadf7d
DM		 2588 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2589}
2590EXPORT_SYMBOL(compat_sock_common_setsockopt);
2591#endif
2592
1da177e4
LT		 2593void sk_common_release(struct sock *sk)
2594{
2595 if (sk->sk_prot->destroy)
2596 sk->sk_prot->destroy(sk);
2597
2598 /*
2599 * Observation: when sock_common_release is called, processes have
2600 * no access to socket. But net still has.
2601 * Step one, detach it from networking:
2602 *
2603 * A. Remove from hash tables.
2604 */
2605
2606 sk->sk_prot->unhash(sk);
2607
2608 /*
2609 * In this point socket cannot receive new packets, but it is possible
2610 * that some packets are in flight because some CPU runs receiver and
2611 * did hash table lookup before we unhashed socket. They will achieve
2612 * receive queue and will be purged by socket destructor.
2613 *
2614 * Also we still have packets pending on receive queue and probably,
2615 * our own packets waiting in device queues. sock_destroy will drain
2616 * receive queue, but transmitted packets will delay socket destruction
2617 * until the last reference will be released.
2618 */
2619
2620 sock_orphan(sk);
2621
2622 xfrm_sk_free_policy(sk);
2623
e6848976 2624 sk_refcnt_debug_release(sk);
5640f768
ED		 2625
2626 if (sk->sk_frag.page) {
2627 put_page(sk->sk_frag.page);
2628 sk->sk_frag.page = NULL;
2629 }
2630
1da177e4
LT		 2631 sock_put(sk);
2632}
1da177e4
LT		 2633EXPORT_SYMBOL(sk_common_release);
2634
13ff3d6f
PE		 2635#ifdef CONFIG_PROC_FS
2636#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2637struct prot_inuse {
2638 int val[PROTO_INUSE_NR];
2639};
13ff3d6f
PE		 2640
2641static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2642
2643#ifdef CONFIG_NET_NS
2644void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2645{
d6d9ca0f 2646 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2647}
2648EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2649
2650int sock_prot_inuse_get(struct net *net, struct proto *prot)
2651{
2652 int cpu, idx = prot->inuse_idx;
2653 int res = 0;
2654
2655 for_each_possible_cpu(cpu)
2656 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2657
2658 return res >= 0 ? res : 0;
2659}
2660EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2661
2c8c1e72 2662static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2663{
2664 net->core.inuse = alloc_percpu(struct prot_inuse);
2665 return net->core.inuse ? 0 : -ENOMEM;
2666}
2667
2c8c1e72 2668static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2669{
2670 free_percpu(net->core.inuse);
2671}
2672
2673static struct pernet_operations net_inuse_ops = {
2674 .init = sock_inuse_init_net,
2675 .exit = sock_inuse_exit_net,
2676};
2677
2678static __init int net_inuse_init(void)
2679{
2680 if (register_pernet_subsys(&net_inuse_ops))
2681 panic("Cannot initialize net inuse counters");
2682
2683 return 0;
2684}
2685
2686core_initcall(net_inuse_init);
2687#else
1338d466
PE		 2688static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2689
c29a0bc4 2690void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2691{
d6d9ca0f 2692 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2693}
2694EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2695
c29a0bc4 2696int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2697{
2698 int cpu, idx = prot->inuse_idx;
2699 int res = 0;
2700
2701 for_each_possible_cpu(cpu)
2702 res += per_cpu(prot_inuse, cpu).val[idx];
2703
2704 return res >= 0 ? res : 0;
2705}
2706EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2707#endif
13ff3d6f
PE		 2708
2709static void assign_proto_idx(struct proto *prot)
2710{
2711 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2712
2713 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2714 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2715 return;
2716 }
2717
2718 set_bit(prot->inuse_idx, proto_inuse_idx);
2719}
2720
2721static void release_proto_idx(struct proto *prot)
2722{
2723 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2724 clear_bit(prot->inuse_idx, proto_inuse_idx);
2725}
2726#else
2727static inline void assign_proto_idx(struct proto *prot)
2728{
2729}
2730
2731static inline void release_proto_idx(struct proto *prot)
2732{
2733}
2734#endif
2735
b733c007
PE		 2736int proto_register(struct proto *prot, int alloc_slab)
2737{
1da177e4
LT		 2738 if (alloc_slab) {
2739 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2740 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2741 NULL);
1da177e4
LT		 2742
2743 if (prot->slab == NULL) {
e005d193
JP		 2744 pr_crit("%s: Can't create sock SLAB cache!\n",
2745 prot->name);
60e7663d 2746 goto out;
1da177e4 2747 }
2e6599cb
ACM		 2748
2749 if (prot->rsk_prot != NULL) {
faf23422 2750 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2751 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2752 goto out_free_sock_slab;
2753
7e56b5d6 2754 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2755 prot->rsk_prot->obj_size, 0,
20c2df83 2756 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2757
2758 if (prot->rsk_prot->slab == NULL) {
e005d193
JP		 2759 pr_crit("%s: Can't create request sock SLAB cache!\n",
2760 prot->name);
2e6599cb
ACM		 2761 goto out_free_request_sock_slab_name;
2762 }
2763 }
8feaf0c0 2764
6d6ee43e 2765 if (prot->twsk_prot != NULL) {
faf23422 2766 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2767
7e56b5d6 2768 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2769 goto out_free_request_sock_slab;
2770
6d6ee43e 2771 prot->twsk_prot->twsk_slab =
7e56b5d6 2772 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2773 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2774 0,
2775 SLAB_HWCACHE_ALIGN |
2776 prot->slab_flags,
20c2df83 2777 NULL);
6d6ee43e 2778 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2779 goto out_free_timewait_sock_slab_name;
2780 }
1da177e4
LT		 2781 }
2782
36b77a52 2783 mutex_lock(&proto_list_mutex);
1da177e4 2784 list_add(&prot->node, &proto_list);
13ff3d6f 2785 assign_proto_idx(prot);
36b77a52 2786 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2787 return 0;
2788
8feaf0c0 2789out_free_timewait_sock_slab_name:
7e56b5d6 2790 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2791out_free_request_sock_slab:
2792 if (prot->rsk_prot && prot->rsk_prot->slab) {
2793 kmem_cache_destroy(prot->rsk_prot->slab);
2794 prot->rsk_prot->slab = NULL;
2795 }
2e6599cb 2796out_free_request_sock_slab_name:
72150e9b
DC		 2797 if (prot->rsk_prot)
2798 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2799out_free_sock_slab:
2800 kmem_cache_destroy(prot->slab);
2801 prot->slab = NULL;
b733c007
PE		 2802out:
2803 return -ENOBUFS;
1da177e4 2804}
1da177e4
LT		 2805EXPORT_SYMBOL(proto_register);
2806
2807void proto_unregister(struct proto *prot)
2808{
36b77a52 2809 mutex_lock(&proto_list_mutex);
13ff3d6f 2810 release_proto_idx(prot);
0a3f4358 2811 list_del(&prot->node);
36b77a52 2812 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2813
2814 if (prot->slab != NULL) {
2815 kmem_cache_destroy(prot->slab);
2816 prot->slab = NULL;
2817 }
2818
2e6599cb 2819 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2820 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2821 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2822 prot->rsk_prot->slab = NULL;
2823 }
2824
6d6ee43e 2825 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2826 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2827 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2828 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2829 }
1da177e4 2830}
1da177e4
LT		 2831EXPORT_SYMBOL(proto_unregister);
2832
2833#ifdef CONFIG_PROC_FS
1da177e4 2834static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2835 __acquires(proto_list_mutex)
1da177e4 2836{
36b77a52 2837 mutex_lock(&proto_list_mutex);
60f0438a 2838 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2839}
2840
2841static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2842{
60f0438a 2843 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2844}
2845
2846static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2847 __releases(proto_list_mutex)
1da177e4 2848{
36b77a52 2849 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2850}
2851
2852static char proto_method_implemented(const void *method)
2853{
2854 return method == NULL ? 'n' : 'y';
2855}
180d8cd9
GC		 2856static long sock_prot_memory_allocated(struct proto *proto)
2857{
cb75a36c 2858 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2859}
2860
2861static char *sock_prot_memory_pressure(struct proto *proto)
2862{
2863 return proto->memory_pressure != NULL ?
2864 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2865}
1da177e4
LT		 2866
2867static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2868{
180d8cd9 2869
8d987e5c 2870 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2871 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2872 proto->name,
2873 proto->obj_size,
14e943db 2874 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2875 sock_prot_memory_allocated(proto),
2876 sock_prot_memory_pressure(proto),
1da177e4
LT		 2877 proto->max_header,
2878 proto->slab == NULL ? "no" : "yes",
2879 module_name(proto->owner),
2880 proto_method_implemented(proto->close),
2881 proto_method_implemented(proto->connect),
2882 proto_method_implemented(proto->disconnect),
2883 proto_method_implemented(proto->accept),
2884 proto_method_implemented(proto->ioctl),
2885 proto_method_implemented(proto->init),
2886 proto_method_implemented(proto->destroy),
2887 proto_method_implemented(proto->shutdown),
2888 proto_method_implemented(proto->setsockopt),
2889 proto_method_implemented(proto->getsockopt),
2890 proto_method_implemented(proto->sendmsg),
2891 proto_method_implemented(proto->recvmsg),
2892 proto_method_implemented(proto->sendpage),
2893 proto_method_implemented(proto->bind),
2894 proto_method_implemented(proto->backlog_rcv),
2895 proto_method_implemented(proto->hash),
2896 proto_method_implemented(proto->unhash),
2897 proto_method_implemented(proto->get_port),
2898 proto_method_implemented(proto->enter_memory_pressure));
2899}
2900
2901static int proto_seq_show(struct seq_file *seq, void *v)
2902{
60f0438a 2903 if (v == &proto_list)
1da177e4
LT		 2904 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2905 "protocol",
2906 "size",
2907 "sockets",
2908 "memory",
2909 "press",
2910 "maxhdr",
2911 "slab",
2912 "module",
2913 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2914 else
60f0438a 2915 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2916 return 0;
2917}
2918
f690808e 2919static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2920 .start = proto_seq_start,
2921 .next = proto_seq_next,
2922 .stop = proto_seq_stop,
2923 .show = proto_seq_show,
2924};
2925
2926static int proto_seq_open(struct inode *inode, struct file *file)
2927{
14e943db
ED		 2928 return seq_open_net(inode, file, &proto_seq_ops,
2929 sizeof(struct seq_net_private));
1da177e4
LT		 2930}
2931
9a32144e 2932static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2933 .owner = THIS_MODULE,
2934 .open = proto_seq_open,
2935 .read = seq_read,
2936 .llseek = seq_lseek,
14e943db
ED		 2937 .release = seq_release_net,
2938};
2939
2940static __net_init int proto_init_net(struct net *net)
2941{
d4beaa66 2942 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 2943 return -ENOMEM;
2944
2945 return 0;
2946}
2947
2948static __net_exit void proto_exit_net(struct net *net)
2949{
ece31ffd 2950 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 2951}
2952
2953
2954static __net_initdata struct pernet_operations proto_net_ops = {
2955 .init = proto_init_net,
2956 .exit = proto_exit_net,
1da177e4
LT		 2957};
2958
2959static int __init proto_init(void)
2960{
14e943db 2961 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2962}
2963
2964subsys_initcall(proto_init);
2965
2966#endif /* PROC_FS */
Linux kernel - Deliverables
This page took 1.058849 seconds and 5 git commands to generate.