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Merge branch 'for-linus-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/mason...
[mirror_ubuntu-zesty-kernel.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
4ec93edb 35 * code. The ACK stuff can wait and needs major
1da177e4
LT		 36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 *
85 *
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
90 */
91
e005d193
JP		 92#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
93
4fc268d2 94#include <linux/capability.h>
1da177e4 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>
eb4cb008 134#include <linux/sock_diag.h>
1da177e4
LT		 135
136#include <linux/filter.h>
538950a1 137#include <net/sock_reuseport.h>
1da177e4 138
3847ce32
SM		 139#include <trace/events/sock.h>
140
1da177e4
LT		 141#ifdef CONFIG_INET
142#include <net/tcp.h>
143#endif
144
076bb0c8 145#include <net/busy_poll.h>
06021292 146
36b77a52 147static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 148static LIST_HEAD(proto_list);
149
a3b299da
EB		 150/**
151 * sk_ns_capable - General socket capability test
152 * @sk: Socket to use a capability on or through
153 * @user_ns: The user namespace of the capability to use
154 * @cap: The capability to use
155 *
156 * Test to see if the opener of the socket had when the socket was
157 * created and the current process has the capability @cap in the user
158 * namespace @user_ns.
159 */
160bool sk_ns_capable(const struct sock *sk,
161 struct user_namespace *user_ns, int cap)
162{
163 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
164 ns_capable(user_ns, cap);
165}
166EXPORT_SYMBOL(sk_ns_capable);
167
168/**
169 * sk_capable - Socket global capability test
170 * @sk: Socket to use a capability on or through
e793c0f7 171 * @cap: The global capability to use
a3b299da
EB		 172 *
173 * Test to see if the opener of the socket had when the socket was
174 * created and the current process has the capability @cap in all user
175 * namespaces.
176 */
177bool sk_capable(const struct sock *sk, int cap)
178{
179 return sk_ns_capable(sk, &init_user_ns, cap);
180}
181EXPORT_SYMBOL(sk_capable);
182
183/**
184 * sk_net_capable - Network namespace socket capability test
185 * @sk: Socket to use a capability on or through
186 * @cap: The capability to use
187 *
e793c0f7 188 * Test to see if the opener of the socket had when the socket was created
a3b299da
EB		 189 * and the current process has the capability @cap over the network namespace
190 * the socket is a member of.
191 */
192bool sk_net_capable(const struct sock *sk, int cap)
193{
194 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
195}
196EXPORT_SYMBOL(sk_net_capable);
197
da21f24d
IM		 198/*
199 * Each address family might have different locking rules, so we have
200 * one slock key per address family:
201 */
a5b5bb9a
IM		 202static struct lock_class_key af_family_keys[AF_MAX];
203static struct lock_class_key af_family_slock_keys[AF_MAX];
204
a5b5bb9a
IM		 205/*
206 * Make lock validator output more readable. (we pre-construct these
207 * strings build-time, so that runtime initialization of socket
208 * locks is fast):
209 */
36cbd3dc 210static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 211 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
212 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
213 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
214 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
215 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
216 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
217 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 218 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 219 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 220 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 221 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 222 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 223 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
0a1a37b6
DC		 224 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_KCM" ,
225 "sk_lock-AF_MAX"
a5b5bb9a 226};
36cbd3dc 227static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 228 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
229 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
230 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
231 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
232 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
233 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
234 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 235 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 236 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 237 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 238 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 239 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 240 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
0a1a37b6
DC		 241 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_KCM" ,
242 "slock-AF_MAX"
a5b5bb9a 243};
36cbd3dc 244static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 245 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
246 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
247 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
248 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
249 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
250 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
251 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 252 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 253 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 254 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 255 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 256 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 257 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
0a1a37b6
DC		 258 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_KCM" ,
259 "clock-AF_MAX"
443aef0e 260};
da21f24d
IM		 261
262/*
263 * sk_callback_lock locking rules are per-address-family,
264 * so split the lock classes by using a per-AF key:
265 */
266static struct lock_class_key af_callback_keys[AF_MAX];
267
1da177e4
LT		 268/* Take into consideration the size of the struct sk_buff overhead in the
269 * determination of these values, since that is non-constant across
270 * platforms. This makes socket queueing behavior and performance
271 * not depend upon such differences.
272 */
273#define _SK_MEM_PACKETS 256
87fb4b7b 274#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 275#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
276#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
277
278/* Run time adjustable parameters. */
ab32ea5d 279__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 280EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 281__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 282EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 283__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
284__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 285
25985edc 286/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 287int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 288EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 289
b245be1f
WB		 290int sysctl_tstamp_allow_data __read_mostly = 1;
291
c93bdd0e
MG		 292struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
293EXPORT_SYMBOL_GPL(memalloc_socks);
294
7cb02404
MG		 295/**
296 * sk_set_memalloc - sets %SOCK_MEMALLOC
297 * @sk: socket to set it on
298 *
299 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
300 * It's the responsibility of the admin to adjust min_free_kbytes
301 * to meet the requirements
302 */
303void sk_set_memalloc(struct sock *sk)
304{
305 sock_set_flag(sk, SOCK_MEMALLOC);
306 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 307 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 308}
309EXPORT_SYMBOL_GPL(sk_set_memalloc);
310
311void sk_clear_memalloc(struct sock *sk)
312{
313 sock_reset_flag(sk, SOCK_MEMALLOC);
314 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 315 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 316
317 /*
318 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
5d753610
MG		 319 * progress of swapping. SOCK_MEMALLOC may be cleared while
320 * it has rmem allocations due to the last swapfile being deactivated
321 * but there is a risk that the socket is unusable due to exceeding
322 * the rmem limits. Reclaim the reserves and obey rmem limits again.
c76562b6 323 */
5d753610 324 sk_mem_reclaim(sk);
7cb02404
MG		 325}
326EXPORT_SYMBOL_GPL(sk_clear_memalloc);
327
b4b9e355
MG		 328int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
329{
330 int ret;
331 unsigned long pflags = current->flags;
332
333 /* these should have been dropped before queueing */
334 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
335
336 current->flags |= PF_MEMALLOC;
337 ret = sk->sk_backlog_rcv(sk, skb);
338 tsk_restore_flags(current, pflags, PF_MEMALLOC);
339
340 return ret;
341}
342EXPORT_SYMBOL(__sk_backlog_rcv);
343
1da177e4
LT		 344static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
345{
346 struct timeval tv;
347
348 if (optlen < sizeof(tv))
349 return -EINVAL;
350 if (copy_from_user(&tv, optval, sizeof(tv)))
351 return -EFAULT;
ba78073e
VA		 352 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
353 return -EDOM;
1da177e4 354
ba78073e 355 if (tv.tv_sec < 0) {
6f11df83
AM		 356 static int warned __read_mostly;
357
ba78073e 358 *timeo_p = 0;
50aab54f 359 if (warned < 10 && net_ratelimit()) {
ba78073e 360 warned++;
e005d193
JP		 361 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
362 __func__, current->comm, task_pid_nr(current));
50aab54f 363 }
ba78073e
VA		 364 return 0;
365 }
1da177e4
LT		 366 *timeo_p = MAX_SCHEDULE_TIMEOUT;
367 if (tv.tv_sec == 0 && tv.tv_usec == 0)
368 return 0;
369 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
370 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
371 return 0;
372}
373
374static void sock_warn_obsolete_bsdism(const char *name)
375{
376 static int warned;
377 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 378 if (strcmp(warncomm, current->comm) && warned < 5) {
379 strcpy(warncomm, current->comm);
e005d193
JP		 380 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
381 warncomm, name);
1da177e4
LT		 382 warned++;
383 }
384}
385
080a270f
HFS		 386static bool sock_needs_netstamp(const struct sock *sk)
387{
388 switch (sk->sk_family) {
389 case AF_UNSPEC:
390 case AF_UNIX:
391 return false;
392 default:
393 return true;
394 }
395}
396
08e29af3 397static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 398{
08e29af3
ED		 399 if (sk->sk_flags & flags) {
400 sk->sk_flags &= ~flags;
080a270f
HFS		 401 if (sock_needs_netstamp(sk) &&
402 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 403 net_disable_timestamp();
1da177e4
LT		 404 }
405}
406
407
e6afc8ac 408int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
f0088a50 409{
3b885787
NH		 410 unsigned long flags;
411 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 412
0fd7bac6 413 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 414 atomic_inc(&sk->sk_drops);
3847ce32 415 trace_sock_rcvqueue_full(sk, skb);
766e9037 416 return -ENOMEM;
f0088a50
DV		 417 }
418
c76562b6 419 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 420 atomic_inc(&sk->sk_drops);
421 return -ENOBUFS;
3ab224be
HA		 422 }
423
f0088a50
DV		 424 skb->dev = NULL;
425 skb_set_owner_r(skb, sk);
49ad9599 426
7fee226a
ED		 427 /* we escape from rcu protected region, make sure we dont leak
428 * a norefcounted dst
429 */
430 skb_dst_force(skb);
431
3b885787 432 spin_lock_irqsave(&list->lock, flags);
3bc3b96f 433 sock_skb_set_dropcount(sk, skb);
3b885787
NH		 434 __skb_queue_tail(list, skb);
435 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 436
437 if (!sock_flag(sk, SOCK_DEAD))
676d2369 438 sk->sk_data_ready(sk);
766e9037 439 return 0;
f0088a50 440}
e6afc8ac 441EXPORT_SYMBOL(__sock_queue_rcv_skb);
442
443int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
444{
445 int err;
446
447 err = sk_filter(sk, skb);
448 if (err)
449 return err;
450
451 return __sock_queue_rcv_skb(sk, skb);
452}
f0088a50
DV		 453EXPORT_SYMBOL(sock_queue_rcv_skb);
454
58a5a7b9 455int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 456{
457 int rc = NET_RX_SUCCESS;
458
fda9ef5d 459 if (sk_filter(sk, skb))
f0088a50
DV		 460 goto discard_and_relse;
461
462 skb->dev = NULL;
463
274f482d 464 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 465 atomic_inc(&sk->sk_drops);
466 goto discard_and_relse;
467 }
58a5a7b9
ACM		 468 if (nested)
469 bh_lock_sock_nested(sk);
470 else
471 bh_lock_sock(sk);
a5b5bb9a
IM		 472 if (!sock_owned_by_user(sk)) {
473 /*
474 * trylock + unlock semantics:
475 */
476 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
477
c57943a1 478 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 479
480 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 481 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 482 bh_unlock_sock(sk);
483 atomic_inc(&sk->sk_drops);
484 goto discard_and_relse;
485 }
486
f0088a50
DV		 487 bh_unlock_sock(sk);
488out:
489 sock_put(sk);
490 return rc;
491discard_and_relse:
492 kfree_skb(skb);
493 goto out;
494}
495EXPORT_SYMBOL(sk_receive_skb);
496
497struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
498{
b6c6712a 499 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 500
501 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 502 sk_tx_queue_clear(sk);
a9b3cd7f 503 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 504 dst_release(dst);
505 return NULL;
506 }
507
508 return dst;
509}
510EXPORT_SYMBOL(__sk_dst_check);
511
512struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
513{
514 struct dst_entry *dst = sk_dst_get(sk);
515
516 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
517 sk_dst_reset(sk);
518 dst_release(dst);
519 return NULL;
520 }
521
522 return dst;
523}
524EXPORT_SYMBOL(sk_dst_check);
525
c91f6df2
BH		 526static int sock_setbindtodevice(struct sock *sk, char __user *optval,
527 int optlen)
4878809f
DM		 528{
529 int ret = -ENOPROTOOPT;
530#ifdef CONFIG_NETDEVICES
3b1e0a65 531 struct net *net = sock_net(sk);
4878809f
DM		 532 char devname[IFNAMSIZ];
533 int index;
534
535 /* Sorry... */
536 ret = -EPERM;
5e1fccc0 537 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 538 goto out;
539
540 ret = -EINVAL;
541 if (optlen < 0)
542 goto out;
543
544 /* Bind this socket to a particular device like "eth0",
545 * as specified in the passed interface name. If the
546 * name is "" or the option length is zero the socket
547 * is not bound.
548 */
549 if (optlen > IFNAMSIZ - 1)
550 optlen = IFNAMSIZ - 1;
551 memset(devname, 0, sizeof(devname));
552
553 ret = -EFAULT;
554 if (copy_from_user(devname, optval, optlen))
555 goto out;
556
000ba2e4
DM		 557 index = 0;
558 if (devname[0] != '\0') {
bf8e56bf 559 struct net_device *dev;
4878809f 560
bf8e56bf
ED		 561 rcu_read_lock();
562 dev = dev_get_by_name_rcu(net, devname);
563 if (dev)
564 index = dev->ifindex;
565 rcu_read_unlock();
4878809f
DM		 566 ret = -ENODEV;
567 if (!dev)
568 goto out;
4878809f
DM		 569 }
570
571 lock_sock(sk);
572 sk->sk_bound_dev_if = index;
573 sk_dst_reset(sk);
574 release_sock(sk);
575
576 ret = 0;
577
578out:
579#endif
580
581 return ret;
582}
583
c91f6df2
BH		 584static int sock_getbindtodevice(struct sock *sk, char __user *optval,
585 int __user *optlen, int len)
586{
587 int ret = -ENOPROTOOPT;
588#ifdef CONFIG_NETDEVICES
589 struct net *net = sock_net(sk);
c91f6df2 590 char devname[IFNAMSIZ];
c91f6df2
BH		 591
592 if (sk->sk_bound_dev_if == 0) {
593 len = 0;
594 goto zero;
595 }
596
597 ret = -EINVAL;
598 if (len < IFNAMSIZ)
599 goto out;
600
5dbe7c17
NS		 601 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
602 if (ret)
c91f6df2 603 goto out;
c91f6df2
BH		 604
605 len = strlen(devname) + 1;
606
607 ret = -EFAULT;
608 if (copy_to_user(optval, devname, len))
609 goto out;
610
611zero:
612 ret = -EFAULT;
613 if (put_user(len, optlen))
614 goto out;
615
616 ret = 0;
617
618out:
619#endif
620
621 return ret;
622}
623
c0ef877b
PE		 624static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
625{
626 if (valbool)
627 sock_set_flag(sk, bit);
628 else
629 sock_reset_flag(sk, bit);
630}
631
f60e5990 632bool sk_mc_loop(struct sock *sk)
633{
634 if (dev_recursion_level())
635 return false;
636 if (!sk)
637 return true;
638 switch (sk->sk_family) {
639 case AF_INET:
640 return inet_sk(sk)->mc_loop;
641#if IS_ENABLED(CONFIG_IPV6)
642 case AF_INET6:
643 return inet6_sk(sk)->mc_loop;
644#endif
645 }
646 WARN_ON(1);
647 return true;
648}
649EXPORT_SYMBOL(sk_mc_loop);
650
1da177e4
LT		 651/*
652 * This is meant for all protocols to use and covers goings on
653 * at the socket level. Everything here is generic.
654 */
655
656int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 657 char __user *optval, unsigned int optlen)
1da177e4 658{
2a91525c 659 struct sock *sk = sock->sk;
1da177e4
LT		 660 int val;
661 int valbool;
662 struct linger ling;
663 int ret = 0;
4ec93edb 664
1da177e4
LT		 665 /*
666 * Options without arguments
667 */
668
4878809f 669 if (optname == SO_BINDTODEVICE)
c91f6df2 670 return sock_setbindtodevice(sk, optval, optlen);
4878809f 671
e71a4783
SH		 672 if (optlen < sizeof(int))
673 return -EINVAL;
4ec93edb 674
1da177e4
LT		 675 if (get_user(val, (int __user *)optval))
676 return -EFAULT;
4ec93edb 677
2a91525c 678 valbool = val ? 1 : 0;
1da177e4
LT		 679
680 lock_sock(sk);
681
2a91525c 682 switch (optname) {
e71a4783 683 case SO_DEBUG:
2a91525c 684 if (val && !capable(CAP_NET_ADMIN))
e71a4783 685 ret = -EACCES;
2a91525c 686 else
c0ef877b 687 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 688 break;
689 case SO_REUSEADDR:
4a17fd52 690 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 691 break;
055dc21a
TH		 692 case SO_REUSEPORT:
693 sk->sk_reuseport = valbool;
694 break;
e71a4783 695 case SO_TYPE:
49c794e9 696 case SO_PROTOCOL:
0d6038ee 697 case SO_DOMAIN:
e71a4783
SH		 698 case SO_ERROR:
699 ret = -ENOPROTOOPT;
700 break;
701 case SO_DONTROUTE:
c0ef877b 702 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 703 break;
704 case SO_BROADCAST:
705 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
706 break;
707 case SO_SNDBUF:
708 /* Don't error on this BSD doesn't and if you think
82981930
ED		 709 * about it this is right. Otherwise apps have to
710 * play 'guess the biggest size' games. RCVBUF/SNDBUF
711 * are treated in BSD as hints
712 */
713 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 714set_sndbuf:
e71a4783 715 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 716 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
717 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 718 sk->sk_write_space(sk);
719 break;
1da177e4 720
e71a4783
SH		 721 case SO_SNDBUFFORCE:
722 if (!capable(CAP_NET_ADMIN)) {
723 ret = -EPERM;
724 break;
725 }
726 goto set_sndbuf;
b0573dea 727
e71a4783
SH		 728 case SO_RCVBUF:
729 /* Don't error on this BSD doesn't and if you think
82981930
ED		 730 * about it this is right. Otherwise apps have to
731 * play 'guess the biggest size' games. RCVBUF/SNDBUF
732 * are treated in BSD as hints
733 */
734 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 735set_rcvbuf:
e71a4783
SH		 736 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
737 /*
738 * We double it on the way in to account for
739 * "struct sk_buff" etc. overhead. Applications
740 * assume that the SO_RCVBUF setting they make will
741 * allow that much actual data to be received on that
742 * socket.
743 *
744 * Applications are unaware that "struct sk_buff" and
745 * other overheads allocate from the receive buffer
746 * during socket buffer allocation.
747 *
748 * And after considering the possible alternatives,
749 * returning the value we actually used in getsockopt
750 * is the most desirable behavior.
751 */
82981930 752 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 753 break;
754
755 case SO_RCVBUFFORCE:
756 if (!capable(CAP_NET_ADMIN)) {
757 ret = -EPERM;
1da177e4 758 break;
e71a4783
SH		 759 }
760 goto set_rcvbuf;
1da177e4 761
e71a4783 762 case SO_KEEPALIVE:
1da177e4 763#ifdef CONFIG_INET
3e10986d
ED		 764 if (sk->sk_protocol == IPPROTO_TCP &&
765 sk->sk_type == SOCK_STREAM)
e71a4783 766 tcp_set_keepalive(sk, valbool);
1da177e4 767#endif
e71a4783
SH		 768 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
769 break;
770
771 case SO_OOBINLINE:
772 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
773 break;
774
775 case SO_NO_CHECK:
28448b80 776 sk->sk_no_check_tx = valbool;
e71a4783
SH		 777 break;
778
779 case SO_PRIORITY:
5e1fccc0
EB		 780 if ((val >= 0 && val <= 6) ||
781 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 782 sk->sk_priority = val;
783 else
784 ret = -EPERM;
785 break;
786
787 case SO_LINGER:
788 if (optlen < sizeof(ling)) {
789 ret = -EINVAL; /* 1003.1g */
1da177e4 790 break;
e71a4783 791 }
2a91525c 792 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 793 ret = -EFAULT;
1da177e4 794 break;
e71a4783
SH		 795 }
796 if (!ling.l_onoff)
797 sock_reset_flag(sk, SOCK_LINGER);
798 else {
1da177e4 799#if (BITS_PER_LONG == 32)
e71a4783
SH		 800 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
801 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 802 else
e71a4783
SH		 803#endif
804 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
805 sock_set_flag(sk, SOCK_LINGER);
806 }
807 break;
808
809 case SO_BSDCOMPAT:
810 sock_warn_obsolete_bsdism("setsockopt");
811 break;
812
813 case SO_PASSCRED:
814 if (valbool)
815 set_bit(SOCK_PASSCRED, &sock->flags);
816 else
817 clear_bit(SOCK_PASSCRED, &sock->flags);
818 break;
819
820 case SO_TIMESTAMP:
92f37fd2 821 case SO_TIMESTAMPNS:
e71a4783 822 if (valbool) {
92f37fd2
ED		 823 if (optname == SO_TIMESTAMP)
824 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
825 else
826 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 827 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 828 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 829 } else {
e71a4783 830 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 831 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
832 }
e71a4783
SH		 833 break;
834
20d49473
PO		 835 case SO_TIMESTAMPING:
836 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 837 ret = -EINVAL;
20d49473
PO		 838 break;
839 }
b245be1f 840
09c2d251 841 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765 842 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
ac5cc977
WC		 843 if (sk->sk_protocol == IPPROTO_TCP &&
844 sk->sk_type == SOCK_STREAM) {
6db8b963
SHY		 845 if ((1 << sk->sk_state) &
846 (TCPF_CLOSE | TCPF_LISTEN)) {
4ed2d765
WB		 847 ret = -EINVAL;
848 break;
849 }
850 sk->sk_tskey = tcp_sk(sk)->snd_una;
851 } else {
852 sk->sk_tskey = 0;
853 }
854 }
b9f40e21 855 sk->sk_tsflags = val;
20d49473
PO		 856 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
857 sock_enable_timestamp(sk,
858 SOCK_TIMESTAMPING_RX_SOFTWARE);
859 else
860 sock_disable_timestamp(sk,
08e29af3 861 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 862 break;
863
e71a4783
SH		 864 case SO_RCVLOWAT:
865 if (val < 0)
866 val = INT_MAX;
867 sk->sk_rcvlowat = val ? : 1;
868 break;
869
870 case SO_RCVTIMEO:
871 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
872 break;
873
874 case SO_SNDTIMEO:
875 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
876 break;
1da177e4 877
e71a4783
SH		 878 case SO_ATTACH_FILTER:
879 ret = -EINVAL;
880 if (optlen == sizeof(struct sock_fprog)) {
881 struct sock_fprog fprog;
1da177e4 882
e71a4783
SH		 883 ret = -EFAULT;
884 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 885 break;
e71a4783
SH		 886
887 ret = sk_attach_filter(&fprog, sk);
888 }
889 break;
890
89aa0758
AS		 891 case SO_ATTACH_BPF:
892 ret = -EINVAL;
893 if (optlen == sizeof(u32)) {
894 u32 ufd;
895
896 ret = -EFAULT;
897 if (copy_from_user(&ufd, optval, sizeof(ufd)))
898 break;
899
900 ret = sk_attach_bpf(ufd, sk);
901 }
902 break;
903
538950a1
CG		 904 case SO_ATTACH_REUSEPORT_CBPF:
905 ret = -EINVAL;
906 if (optlen == sizeof(struct sock_fprog)) {
907 struct sock_fprog fprog;
908
909 ret = -EFAULT;
910 if (copy_from_user(&fprog, optval, sizeof(fprog)))
911 break;
912
913 ret = sk_reuseport_attach_filter(&fprog, sk);
914 }
915 break;
916
917 case SO_ATTACH_REUSEPORT_EBPF:
918 ret = -EINVAL;
919 if (optlen == sizeof(u32)) {
920 u32 ufd;
921
922 ret = -EFAULT;
923 if (copy_from_user(&ufd, optval, sizeof(ufd)))
924 break;
925
926 ret = sk_reuseport_attach_bpf(ufd, sk);
927 }
928 break;
929
e71a4783 930 case SO_DETACH_FILTER:
55b33325 931 ret = sk_detach_filter(sk);
e71a4783 932 break;
1da177e4 933
d59577b6
VB		 934 case SO_LOCK_FILTER:
935 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
936 ret = -EPERM;
937 else
938 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
939 break;
940
e71a4783
SH		 941 case SO_PASSSEC:
942 if (valbool)
943 set_bit(SOCK_PASSSEC, &sock->flags);
944 else
945 clear_bit(SOCK_PASSSEC, &sock->flags);
946 break;
4a19ec58 947 case SO_MARK:
5e1fccc0 948 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 949 ret = -EPERM;
2a91525c 950 else
4a19ec58 951 sk->sk_mark = val;
4a19ec58 952 break;
877ce7c1 953
3b885787 954 case SO_RXQ_OVFL:
8083f0fc 955 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 956 break;
6e3e939f
JB		 957
958 case SO_WIFI_STATUS:
959 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
960 break;
961
ef64a54f
PE		 962 case SO_PEEK_OFF:
963 if (sock->ops->set_peek_off)
12663bfc 964 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 965 else
966 ret = -EOPNOTSUPP;
967 break;
3bdc0eba
BG		 968
969 case SO_NOFCS:
970 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
971 break;
972
7d4c04fc
KJ		 973 case SO_SELECT_ERR_QUEUE:
974 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
975 break;
976
e0d1095a 977#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 978 case SO_BUSY_POLL:
dafcc438
ET		 979 /* allow unprivileged users to decrease the value */
980 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
981 ret = -EPERM;
982 else {
983 if (val < 0)
984 ret = -EINVAL;
985 else
986 sk->sk_ll_usec = val;
987 }
988 break;
989#endif
62748f32
ED		 990
991 case SO_MAX_PACING_RATE:
992 sk->sk_max_pacing_rate = val;
993 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
994 sk->sk_max_pacing_rate);
995 break;
996
70da268b
ED		 997 case SO_INCOMING_CPU:
998 sk->sk_incoming_cpu = val;
999 break;
1000
a87cb3e4
TH		 1001 case SO_CNX_ADVICE:
1002 if (val == 1)
1003 dst_negative_advice(sk);
1004 break;
e71a4783
SH		 1005 default:
1006 ret = -ENOPROTOOPT;
1007 break;
4ec93edb 1008 }
1da177e4
LT		 1009 release_sock(sk);
1010 return ret;
1011}
2a91525c 1012EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 1013
1014
8f09898b 1015static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1016 struct ucred *ucred)
3f551f94
EB		 1017{
1018 ucred->pid = pid_vnr(pid);
1019 ucred->uid = ucred->gid = -1;
1020 if (cred) {
1021 struct user_namespace *current_ns = current_user_ns();
1022
b2e4f544
EB		 1023 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1024 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 1025 }
1026}
1027
1da177e4
LT		 1028int sock_getsockopt(struct socket *sock, int level, int optname,
1029 char __user *optval, int __user *optlen)
1030{
1031 struct sock *sk = sock->sk;
4ec93edb 1032
e71a4783 1033 union {
4ec93edb
YH		 1034 int val;
1035 struct linger ling;
1da177e4
LT		 1036 struct timeval tm;
1037 } v;
4ec93edb 1038
4d0392be 1039 int lv = sizeof(int);
1da177e4 1040 int len;
4ec93edb 1041
e71a4783 1042 if (get_user(len, optlen))
4ec93edb 1043 return -EFAULT;
e71a4783 1044 if (len < 0)
1da177e4 1045 return -EINVAL;
4ec93edb 1046
50fee1de 1047 memset(&v, 0, sizeof(v));
df0bca04 1048
2a91525c 1049 switch (optname) {
e71a4783
SH		 1050 case SO_DEBUG:
1051 v.val = sock_flag(sk, SOCK_DBG);
1052 break;
1053
1054 case SO_DONTROUTE:
1055 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1056 break;
1057
1058 case SO_BROADCAST:
1b23a5df 1059 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1060 break;
1061
1062 case SO_SNDBUF:
1063 v.val = sk->sk_sndbuf;
1064 break;
1065
1066 case SO_RCVBUF:
1067 v.val = sk->sk_rcvbuf;
1068 break;
1069
1070 case SO_REUSEADDR:
1071 v.val = sk->sk_reuse;
1072 break;
1073
055dc21a
TH		 1074 case SO_REUSEPORT:
1075 v.val = sk->sk_reuseport;
1076 break;
1077
e71a4783 1078 case SO_KEEPALIVE:
1b23a5df 1079 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1080 break;
1081
1082 case SO_TYPE:
1083 v.val = sk->sk_type;
1084 break;
1085
49c794e9
JE		 1086 case SO_PROTOCOL:
1087 v.val = sk->sk_protocol;
1088 break;
1089
0d6038ee
JE		 1090 case SO_DOMAIN:
1091 v.val = sk->sk_family;
1092 break;
1093
e71a4783
SH		 1094 case SO_ERROR:
1095 v.val = -sock_error(sk);
2a91525c 1096 if (v.val == 0)
e71a4783
SH		 1097 v.val = xchg(&sk->sk_err_soft, 0);
1098 break;
1099
1100 case SO_OOBINLINE:
1b23a5df 1101 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1102 break;
1103
1104 case SO_NO_CHECK:
28448b80 1105 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1106 break;
1107
1108 case SO_PRIORITY:
1109 v.val = sk->sk_priority;
1110 break;
1111
1112 case SO_LINGER:
1113 lv = sizeof(v.ling);
1b23a5df 1114 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1115 v.ling.l_linger = sk->sk_lingertime / HZ;
1116 break;
1117
1118 case SO_BSDCOMPAT:
1119 sock_warn_obsolete_bsdism("getsockopt");
1120 break;
1121
1122 case SO_TIMESTAMP:
92f37fd2
ED		 1123 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1124 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1125 break;
1126
1127 case SO_TIMESTAMPNS:
1128 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1129 break;
1130
20d49473 1131 case SO_TIMESTAMPING:
b9f40e21 1132 v.val = sk->sk_tsflags;
20d49473
PO		 1133 break;
1134
e71a4783 1135 case SO_RCVTIMEO:
2a91525c 1136 lv = sizeof(struct timeval);
e71a4783
SH		 1137 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1138 v.tm.tv_sec = 0;
1139 v.tm.tv_usec = 0;
1140 } else {
1141 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1142 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1143 }
1144 break;
1145
1146 case SO_SNDTIMEO:
2a91525c 1147 lv = sizeof(struct timeval);
e71a4783
SH		 1148 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1149 v.tm.tv_sec = 0;
1150 v.tm.tv_usec = 0;
1151 } else {
1152 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1153 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1154 }
1155 break;
1da177e4 1156
e71a4783
SH		 1157 case SO_RCVLOWAT:
1158 v.val = sk->sk_rcvlowat;
1159 break;
1da177e4 1160
e71a4783 1161 case SO_SNDLOWAT:
2a91525c 1162 v.val = 1;
e71a4783 1163 break;
1da177e4 1164
e71a4783 1165 case SO_PASSCRED:
82981930 1166 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1167 break;
1da177e4 1168
e71a4783 1169 case SO_PEERCRED:
109f6e39
EB		 1170 {
1171 struct ucred peercred;
1172 if (len > sizeof(peercred))
1173 len = sizeof(peercred);
1174 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1175 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1176 return -EFAULT;
1177 goto lenout;
109f6e39 1178 }
1da177e4 1179
e71a4783
SH		 1180 case SO_PEERNAME:
1181 {
1182 char address[128];
1183
1184 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1185 return -ENOTCONN;
1186 if (lv < len)
1187 return -EINVAL;
1188 if (copy_to_user(optval, address, len))
1189 return -EFAULT;
1190 goto lenout;
1191 }
1da177e4 1192
e71a4783
SH		 1193 /* Dubious BSD thing... Probably nobody even uses it, but
1194 * the UNIX standard wants it for whatever reason... -DaveM
1195 */
1196 case SO_ACCEPTCONN:
1197 v.val = sk->sk_state == TCP_LISTEN;
1198 break;
1da177e4 1199
e71a4783 1200 case SO_PASSSEC:
82981930 1201 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1202 break;
877ce7c1 1203
e71a4783
SH		 1204 case SO_PEERSEC:
1205 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1206
4a19ec58
LAT		 1207 case SO_MARK:
1208 v.val = sk->sk_mark;
1209 break;
1210
3b885787 1211 case SO_RXQ_OVFL:
1b23a5df 1212 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1213 break;
1214
6e3e939f 1215 case SO_WIFI_STATUS:
1b23a5df 1216 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1217 break;
1218
ef64a54f
PE		 1219 case SO_PEEK_OFF:
1220 if (!sock->ops->set_peek_off)
1221 return -EOPNOTSUPP;
1222
1223 v.val = sk->sk_peek_off;
1224 break;
bc2f7996 1225 case SO_NOFCS:
1b23a5df 1226 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1227 break;
c91f6df2 1228
f7b86bfe 1229 case SO_BINDTODEVICE:
c91f6df2
BH		 1230 return sock_getbindtodevice(sk, optval, optlen, len);
1231
a8fc9277
PE		 1232 case SO_GET_FILTER:
1233 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1234 if (len < 0)
1235 return len;
1236
1237 goto lenout;
c91f6df2 1238
d59577b6
VB		 1239 case SO_LOCK_FILTER:
1240 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1241 break;
1242
ea02f941
MS		 1243 case SO_BPF_EXTENSIONS:
1244 v.val = bpf_tell_extensions();
1245 break;
1246
7d4c04fc
KJ		 1247 case SO_SELECT_ERR_QUEUE:
1248 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1249 break;
1250
e0d1095a 1251#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1252 case SO_BUSY_POLL:
dafcc438
ET		 1253 v.val = sk->sk_ll_usec;
1254 break;
1255#endif
1256
62748f32
ED		 1257 case SO_MAX_PACING_RATE:
1258 v.val = sk->sk_max_pacing_rate;
1259 break;
1260
2c8c56e1
ED		 1261 case SO_INCOMING_CPU:
1262 v.val = sk->sk_incoming_cpu;
1263 break;
1264
e71a4783 1265 default:
443b5991
YH		 1266 /* We implement the SO_SNDLOWAT etc to not be settable
1267 * (1003.1g 7).
1268 */
e71a4783 1269 return -ENOPROTOOPT;
1da177e4 1270 }
e71a4783 1271
1da177e4
LT		 1272 if (len > lv)
1273 len = lv;
1274 if (copy_to_user(optval, &v, len))
1275 return -EFAULT;
1276lenout:
4ec93edb
YH		 1277 if (put_user(len, optlen))
1278 return -EFAULT;
1279 return 0;
1da177e4
LT		 1280}
1281
a5b5bb9a
IM		 1282/*
1283 * Initialize an sk_lock.
1284 *
1285 * (We also register the sk_lock with the lock validator.)
1286 */
b6f99a21 1287static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1288{
ed07536e
PZ		 1289 sock_lock_init_class_and_name(sk,
1290 af_family_slock_key_strings[sk->sk_family],
1291 af_family_slock_keys + sk->sk_family,
1292 af_family_key_strings[sk->sk_family],
1293 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1294}
1295
4dc6dc71
ED		 1296/*
1297 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1298 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1299 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1300 */
f1a6c4da
PE		 1301static void sock_copy(struct sock *nsk, const struct sock *osk)
1302{
1303#ifdef CONFIG_SECURITY_NETWORK
1304 void *sptr = nsk->sk_security;
1305#endif
68835aba
ED		 1306 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1307
1308 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1309 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1310
f1a6c4da
PE		 1311#ifdef CONFIG_SECURITY_NETWORK
1312 nsk->sk_security = sptr;
1313 security_sk_clone(osk, nsk);
1314#endif
1315}
1316
fcbdf09d
OP		 1317void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1318{
1319 unsigned long nulls1, nulls2;
1320
1321 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1322 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1323 if (nulls1 > nulls2)
1324 swap(nulls1, nulls2);
1325
1326 if (nulls1 != 0)
1327 memset((char *)sk, 0, nulls1);
1328 memset((char *)sk + nulls1 + sizeof(void *), 0,
1329 nulls2 - nulls1 - sizeof(void *));
1330 memset((char *)sk + nulls2 + sizeof(void *), 0,
1331 size - nulls2 - sizeof(void *));
1332}
1333EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1334
2e4afe7b
PE		 1335static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1336 int family)
c308c1b2
PE		 1337{
1338 struct sock *sk;
1339 struct kmem_cache *slab;
1340
1341 slab = prot->slab;
e912b114
ED		 1342 if (slab != NULL) {
1343 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1344 if (!sk)
1345 return sk;
1346 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1347 if (prot->clear_sk)
1348 prot->clear_sk(sk, prot->obj_size);
1349 else
1350 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1351 }
fcbdf09d 1352 } else
c308c1b2
PE		 1353 sk = kmalloc(prot->obj_size, priority);
1354
2e4afe7b 1355 if (sk != NULL) {
a98b65a3
VN		 1356 kmemcheck_annotate_bitfield(sk, flags);
1357
2e4afe7b
PE		 1358 if (security_sk_alloc(sk, family, priority))
1359 goto out_free;
1360
1361 if (!try_module_get(prot->owner))
1362 goto out_free_sec;
e022f0b4 1363 sk_tx_queue_clear(sk);
bd1060a1 1364 cgroup_sk_alloc(&sk->sk_cgrp_data);
2e4afe7b
PE		 1365 }
1366
c308c1b2 1367 return sk;
2e4afe7b
PE		 1368
1369out_free_sec:
1370 security_sk_free(sk);
1371out_free:
1372 if (slab != NULL)
1373 kmem_cache_free(slab, sk);
1374 else
1375 kfree(sk);
1376 return NULL;
c308c1b2
PE		 1377}
1378
1379static void sk_prot_free(struct proto *prot, struct sock *sk)
1380{
1381 struct kmem_cache *slab;
2e4afe7b 1382 struct module *owner;
c308c1b2 1383
2e4afe7b 1384 owner = prot->owner;
c308c1b2 1385 slab = prot->slab;
2e4afe7b 1386
bd1060a1 1387 cgroup_sk_free(&sk->sk_cgrp_data);
2e4afe7b 1388 security_sk_free(sk);
c308c1b2
PE		 1389 if (slab != NULL)
1390 kmem_cache_free(slab, sk);
1391 else
1392 kfree(sk);
2e4afe7b 1393 module_put(owner);
c308c1b2
PE		 1394}
1395
1da177e4
LT		 1396/**
1397 * sk_alloc - All socket objects are allocated here
c4ea43c5 1398 * @net: the applicable net namespace
4dc3b16b
PP		 1399 * @family: protocol family
1400 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1401 * @prot: struct proto associated with this new sock instance
11aa9c28 1402 * @kern: is this to be a kernel socket?
1da177e4 1403 */
1b8d7ae4 1404struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
11aa9c28 1405 struct proto *prot, int kern)
1da177e4 1406{
c308c1b2 1407 struct sock *sk;
1da177e4 1408
154adbc8 1409 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1410 if (sk) {
154adbc8
PE		 1411 sk->sk_family = family;
1412 /*
1413 * See comment in struct sock definition to understand
1414 * why we need sk_prot_creator -acme
1415 */
1416 sk->sk_prot = sk->sk_prot_creator = prot;
1417 sock_lock_init(sk);
26abe143
EB		 1418 sk->sk_net_refcnt = kern ? 0 : 1;
1419 if (likely(sk->sk_net_refcnt))
1420 get_net(net);
1421 sock_net_set(sk, net);
d66ee058 1422 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1423
2a56a1fe
TH		 1424 sock_update_classid(&sk->sk_cgrp_data);
1425 sock_update_netprioidx(&sk->sk_cgrp_data);
1da177e4 1426 }
a79af59e 1427
2e4afe7b 1428 return sk;
1da177e4 1429}
2a91525c 1430EXPORT_SYMBOL(sk_alloc);
1da177e4 1431
a4298e45
ED		 1432/* Sockets having SOCK_RCU_FREE will call this function after one RCU
1433 * grace period. This is the case for UDP sockets and TCP listeners.
1434 */
1435static void __sk_destruct(struct rcu_head *head)
1da177e4 1436{
a4298e45 1437 struct sock *sk = container_of(head, struct sock, sk_rcu);
1da177e4 1438 struct sk_filter *filter;
1da177e4
LT		 1439
1440 if (sk->sk_destruct)
1441 sk->sk_destruct(sk);
1442
a898def2
PM		 1443 filter = rcu_dereference_check(sk->sk_filter,
1444 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1445 if (filter) {
309dd5fc 1446 sk_filter_uncharge(sk, filter);
a9b3cd7f 1447 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4 1448 }
538950a1
CG		 1449 if (rcu_access_pointer(sk->sk_reuseport_cb))
1450 reuseport_detach_sock(sk);
1da177e4 1451
08e29af3 1452 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1453
1454 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1455 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1456 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1457
109f6e39
EB		 1458 if (sk->sk_peer_cred)
1459 put_cred(sk->sk_peer_cred);
1460 put_pid(sk->sk_peer_pid);
26abe143
EB		 1461 if (likely(sk->sk_net_refcnt))
1462 put_net(sock_net(sk));
c308c1b2 1463 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1464}
2b85a34e 1465
a4298e45
ED		 1466void sk_destruct(struct sock *sk)
1467{
1468 if (sock_flag(sk, SOCK_RCU_FREE))
1469 call_rcu(&sk->sk_rcu, __sk_destruct);
1470 else
1471 __sk_destruct(&sk->sk_rcu);
1472}
1473
eb4cb008
CG		 1474static void __sk_free(struct sock *sk)
1475{
b922622e 1476 if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt))
eb4cb008
CG		 1477 sock_diag_broadcast_destroy(sk);
1478 else
1479 sk_destruct(sk);
1480}
1481
2b85a34e
ED		 1482void sk_free(struct sock *sk)
1483{
1484 /*
25985edc 1485 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1486 * some packets are still in some tx queue.
1487 * If not null, sock_wfree() will call __sk_free(sk) later
1488 */
1489 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1490 __sk_free(sk);
1491}
2a91525c 1492EXPORT_SYMBOL(sk_free);
1da177e4 1493
e56c57d0
ED		 1494/**
1495 * sk_clone_lock - clone a socket, and lock its clone
1496 * @sk: the socket to clone
1497 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1498 *
1499 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1500 */
1501struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1502{
8fd1d178 1503 struct sock *newsk;
278571ba 1504 bool is_charged = true;
87d11ceb 1505
8fd1d178 1506 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1507 if (newsk != NULL) {
1508 struct sk_filter *filter;
1509
892c141e 1510 sock_copy(newsk, sk);
87d11ceb
ACM		 1511
1512 /* SANITY */
8a681736
SV		 1513 if (likely(newsk->sk_net_refcnt))
1514 get_net(sock_net(newsk));
87d11ceb
ACM		 1515 sk_node_init(&newsk->sk_node);
1516 sock_lock_init(newsk);
1517 bh_lock_sock(newsk);
fa438ccf 1518 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1519 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1520
1521 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1522 /*
1523 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1524 */
1525 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1526 atomic_set(&newsk->sk_omem_alloc, 0);
1527 skb_queue_head_init(&newsk->sk_receive_queue);
1528 skb_queue_head_init(&newsk->sk_write_queue);
1529
87d11ceb 1530 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1531 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1532 af_callback_keys + newsk->sk_family,
1533 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1534
1535 newsk->sk_dst_cache = NULL;
1536 newsk->sk_wmem_queued = 0;
1537 newsk->sk_forward_alloc = 0;
9caad864 1538 atomic_set(&newsk->sk_drops, 0);
87d11ceb 1539 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1540 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1541
1542 sock_reset_flag(newsk, SOCK_DONE);
1543 skb_queue_head_init(&newsk->sk_error_queue);
1544
0d7da9dd 1545 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb 1546 if (filter != NULL)
278571ba
AS		 1547 /* though it's an empty new sock, the charging may fail
1548 * if sysctl_optmem_max was changed between creation of
1549 * original socket and cloning
1550 */
1551 is_charged = sk_filter_charge(newsk, filter);
87d11ceb 1552
d188ba86 1553 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
87d11ceb
ACM		 1554 /* It is still raw copy of parent, so invalidate
1555 * destructor and make plain sk_free() */
1556 newsk->sk_destruct = NULL;
b0691c8e 1557 bh_unlock_sock(newsk);
87d11ceb
ACM		 1558 sk_free(newsk);
1559 newsk = NULL;
1560 goto out;
1561 }
fa463497 1562 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
87d11ceb
ACM		 1563
1564 newsk->sk_err = 0;
1565 newsk->sk_priority = 0;
2c8c56e1 1566 newsk->sk_incoming_cpu = raw_smp_processor_id();
33cf7c90 1567 atomic64_set(&newsk->sk_cookie, 0);
4dc6dc71
ED		 1568 /*
1569 * Before updating sk_refcnt, we must commit prior changes to memory
1570 * (Documentation/RCU/rculist_nulls.txt for details)
1571 */
1572 smp_wmb();
87d11ceb
ACM		 1573 atomic_set(&newsk->sk_refcnt, 2);
1574
1575 /*
1576 * Increment the counter in the same struct proto as the master
1577 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1578 * is the same as sk->sk_prot->socks, as this field was copied
1579 * with memcpy).
1580 *
1581 * This _changes_ the previous behaviour, where
1582 * tcp_create_openreq_child always was incrementing the
1583 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1584 * to be taken into account in all callers. -acme
1585 */
1586 sk_refcnt_debug_inc(newsk);
972692e0 1587 sk_set_socket(newsk, NULL);
43815482 1588 newsk->sk_wq = NULL;
87d11ceb 1589
baac50bb 1590 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
3d596f7b 1591 sock_update_memcg(newsk);
f3f511e1 1592
87d11ceb 1593 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1594 sk_sockets_allocated_inc(newsk);
704da560 1595
080a270f
HFS		 1596 if (sock_needs_netstamp(sk) &&
1597 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1598 net_enable_timestamp();
87d11ceb
ACM		 1599 }
1600out:
1601 return newsk;
1602}
e56c57d0 1603EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1604
9958089a
AK		 1605void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1606{
d6a4e26a
ED		 1607 u32 max_segs = 1;
1608
6bd4f355 1609 sk_dst_set(sk, dst);
9958089a
AK		 1610 sk->sk_route_caps = dst->dev->features;
1611 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1612 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1613 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1614 if (sk_can_gso(sk)) {
82cc1a7a 1615 if (dst->header_len) {
9958089a 1616 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1617 } else {
9958089a 1618 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1619 sk->sk_gso_max_size = dst->dev->gso_max_size;
d6a4e26a 1620 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
82cc1a7a 1621 }
9958089a 1622 }
d6a4e26a 1623 sk->sk_gso_max_segs = max_segs;
9958089a
AK		 1624}
1625EXPORT_SYMBOL_GPL(sk_setup_caps);
1626
1da177e4
LT		 1627/*
1628 * Simple resource managers for sockets.
1629 */
1630
1631
4ec93edb
YH		 1632/*
1633 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1634 */
1635void sock_wfree(struct sk_buff *skb)
1636{
1637 struct sock *sk = skb->sk;
d99927f4 1638 unsigned int len = skb->truesize;
1da177e4 1639
d99927f4
ED		 1640 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1641 /*
1642 * Keep a reference on sk_wmem_alloc, this will be released
1643 * after sk_write_space() call
1644 */
1645 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1646 sk->sk_write_space(sk);
d99927f4
ED		 1647 len = 1;
1648 }
2b85a34e 1649 /*
d99927f4
ED		 1650 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1651 * could not do because of in-flight packets
2b85a34e 1652 */
d99927f4 1653 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1654 __sk_free(sk);
1da177e4 1655}
2a91525c 1656EXPORT_SYMBOL(sock_wfree);
1da177e4 1657
1d2077ac
ED		 1658/* This variant of sock_wfree() is used by TCP,
1659 * since it sets SOCK_USE_WRITE_QUEUE.
1660 */
1661void __sock_wfree(struct sk_buff *skb)
1662{
1663 struct sock *sk = skb->sk;
1664
1665 if (atomic_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
1666 __sk_free(sk);
1667}
1668
9e17f8a4
ED		 1669void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1670{
1671 skb_orphan(skb);
1672 skb->sk = sk;
1673#ifdef CONFIG_INET
1674 if (unlikely(!sk_fullsock(sk))) {
1675 skb->destructor = sock_edemux;
1676 sock_hold(sk);
1677 return;
1678 }
1679#endif
1680 skb->destructor = sock_wfree;
1681 skb_set_hash_from_sk(skb, sk);
1682 /*
1683 * We used to take a refcount on sk, but following operation
1684 * is enough to guarantee sk_free() wont free this sock until
1685 * all in-flight packets are completed
1686 */
1687 atomic_add(skb->truesize, &sk->sk_wmem_alloc);
1688}
1689EXPORT_SYMBOL(skb_set_owner_w);
1690
1d2077ac
ED		 1691/* This helper is used by netem, as it can hold packets in its
1692 * delay queue. We want to allow the owner socket to send more
1693 * packets, as if they were already TX completed by a typical driver.
1694 * But we also want to keep skb->sk set because some packet schedulers
1695 * rely on it (sch_fq for example). So we set skb->truesize to a small
1696 * amount (1) and decrease sk_wmem_alloc accordingly.
1697 */
f2f872f9
ED		 1698void skb_orphan_partial(struct sk_buff *skb)
1699{
1d2077ac
ED		 1700 /* If this skb is a TCP pure ACK or already went here,
1701 * we have nothing to do. 2 is already a very small truesize.
1702 */
1703 if (skb->truesize <= 2)
1704 return;
1705
f2f872f9
ED		 1706 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1707 * so we do not completely orphan skb, but transfert all
1708 * accounted bytes but one, to avoid unexpected reorders.
1709 */
1710 if (skb->destructor == sock_wfree
1711#ifdef CONFIG_INET
1712 || skb->destructor == tcp_wfree
1713#endif
1714 ) {
1715 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1716 skb->truesize = 1;
1717 } else {
1718 skb_orphan(skb);
1719 }
1720}
1721EXPORT_SYMBOL(skb_orphan_partial);
1722
4ec93edb
YH		 1723/*
1724 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1725 */
1726void sock_rfree(struct sk_buff *skb)
1727{
1728 struct sock *sk = skb->sk;
d361fd59 1729 unsigned int len = skb->truesize;
1da177e4 1730
d361fd59
ED		 1731 atomic_sub(len, &sk->sk_rmem_alloc);
1732 sk_mem_uncharge(sk, len);
1da177e4 1733}
2a91525c 1734EXPORT_SYMBOL(sock_rfree);
1da177e4 1735
7768eed8
OH		 1736/*
1737 * Buffer destructor for skbs that are not used directly in read or write
1738 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1739 */
62bccb8c
AD		 1740void sock_efree(struct sk_buff *skb)
1741{
1742 sock_put(skb->sk);
1743}
1744EXPORT_SYMBOL(sock_efree);
1745
976d0201 1746kuid_t sock_i_uid(struct sock *sk)
1da177e4 1747{
976d0201 1748 kuid_t uid;
1da177e4 1749
f064af1e 1750 read_lock_bh(&sk->sk_callback_lock);
976d0201 1751 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1752 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1753 return uid;
1754}
2a91525c 1755EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1756
1757unsigned long sock_i_ino(struct sock *sk)
1758{
1759 unsigned long ino;
1760
f064af1e 1761 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1762 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1763 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1764 return ino;
1765}
2a91525c 1766EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1767
1768/*
1769 * Allocate a skb from the socket's send buffer.
1770 */
86a76caf 1771struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1772 gfp_t priority)
1da177e4
LT		 1773{
1774 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1775 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1776 if (skb) {
1777 skb_set_owner_w(skb, sk);
1778 return skb;
1779 }
1780 }
1781 return NULL;
1782}
2a91525c 1783EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1784
4ec93edb 1785/*
1da177e4 1786 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1787 */
dd0fc66f 1788void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1789{
95c96174 1790 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1791 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1792 void *mem;
1793 /* First do the add, to avoid the race if kmalloc
4ec93edb 1794 * might sleep.
1da177e4
LT		 1795 */
1796 atomic_add(size, &sk->sk_omem_alloc);
1797 mem = kmalloc(size, priority);
1798 if (mem)
1799 return mem;
1800 atomic_sub(size, &sk->sk_omem_alloc);
1801 }
1802 return NULL;
1803}
2a91525c 1804EXPORT_SYMBOL(sock_kmalloc);
1da177e4 1805
79e88659
DB		 1806/* Free an option memory block. Note, we actually want the inline
1807 * here as this allows gcc to detect the nullify and fold away the
1808 * condition entirely.
1da177e4 1809 */
79e88659
DB		 1810static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1811 const bool nullify)
1da177e4 1812{
e53da5fb
DM		 1813 if (WARN_ON_ONCE(!mem))
1814 return;
79e88659
DB		 1815 if (nullify)
1816 kzfree(mem);
1817 else
1818 kfree(mem);
1da177e4
LT		 1819 atomic_sub(size, &sk->sk_omem_alloc);
1820}
79e88659
DB		 1821
1822void sock_kfree_s(struct sock *sk, void *mem, int size)
1823{
1824 __sock_kfree_s(sk, mem, size, false);
1825}
2a91525c 1826EXPORT_SYMBOL(sock_kfree_s);
1da177e4 1827
79e88659
DB		 1828void sock_kzfree_s(struct sock *sk, void *mem, int size)
1829{
1830 __sock_kfree_s(sk, mem, size, true);
1831}
1832EXPORT_SYMBOL(sock_kzfree_s);
1833
1da177e4
LT		 1834/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1835 I think, these locks should be removed for datagram sockets.
1836 */
2a91525c 1837static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1838{
1839 DEFINE_WAIT(wait);
1840
9cd3e072 1841 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1da177e4
LT		 1842 for (;;) {
1843 if (!timeo)
1844 break;
1845 if (signal_pending(current))
1846 break;
1847 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1848 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1849 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1850 break;
1851 if (sk->sk_shutdown & SEND_SHUTDOWN)
1852 break;
1853 if (sk->sk_err)
1854 break;
1855 timeo = schedule_timeout(timeo);
1856 }
aa395145 1857 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1858 return timeo;
1859}
1860
1861
1862/*
1863 * Generic send/receive buffer handlers
1864 */
1865
4cc7f68d
HX		 1866struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1867 unsigned long data_len, int noblock,
28d64271 1868 int *errcode, int max_page_order)
1da177e4 1869{
2e4e4410 1870 struct sk_buff *skb;
1da177e4
LT		 1871 long timeo;
1872 int err;
1873
1da177e4 1874 timeo = sock_sndtimeo(sk, noblock);
2e4e4410 1875 for (;;) {
1da177e4
LT		 1876 err = sock_error(sk);
1877 if (err != 0)
1878 goto failure;
1879
1880 err = -EPIPE;
1881 if (sk->sk_shutdown & SEND_SHUTDOWN)
1882 goto failure;
1883
2e4e4410
ED		 1884 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
1885 break;
28d64271 1886
9cd3e072 1887 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2e4e4410
ED		 1888 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1889 err = -EAGAIN;
1890 if (!timeo)
1da177e4 1891 goto failure;
2e4e4410
ED		 1892 if (signal_pending(current))
1893 goto interrupted;
1894 timeo = sock_wait_for_wmem(sk, timeo);
1da177e4 1895 }
2e4e4410
ED		 1896 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
1897 errcode, sk->sk_allocation);
1898 if (skb)
1899 skb_set_owner_w(skb, sk);
1da177e4
LT		 1900 return skb;
1901
1902interrupted:
1903 err = sock_intr_errno(timeo);
1904failure:
1905 *errcode = err;
1906 return NULL;
1907}
4cc7f68d 1908EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1909
4ec93edb 1910struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1911 int noblock, int *errcode)
1912{
28d64271 1913 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1914}
2a91525c 1915EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1916
39771b12
WB		 1917int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
1918 struct sockcm_cookie *sockc)
1919{
3dd17e63
SHY		 1920 u32 tsflags;
1921
39771b12
WB		 1922 switch (cmsg->cmsg_type) {
1923 case SO_MARK:
1924 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1925 return -EPERM;
1926 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
1927 return -EINVAL;
1928 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
1929 break;
3dd17e63
SHY		 1930 case SO_TIMESTAMPING:
1931 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
1932 return -EINVAL;
1933
1934 tsflags = *(u32 *)CMSG_DATA(cmsg);
1935 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
1936 return -EINVAL;
1937
1938 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
1939 sockc->tsflags |= tsflags;
1940 break;
39771b12
WB		 1941 default:
1942 return -EINVAL;
1943 }
1944 return 0;
1945}
1946EXPORT_SYMBOL(__sock_cmsg_send);
1947
f28ea365
EJ		 1948int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
1949 struct sockcm_cookie *sockc)
1950{
1951 struct cmsghdr *cmsg;
39771b12 1952 int ret;
f28ea365
EJ		 1953
1954 for_each_cmsghdr(cmsg, msg) {
1955 if (!CMSG_OK(msg, cmsg))
1956 return -EINVAL;
1957 if (cmsg->cmsg_level != SOL_SOCKET)
1958 continue;
39771b12
WB		 1959 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
1960 if (ret)
1961 return ret;
f28ea365
EJ		 1962 }
1963 return 0;
1964}
1965EXPORT_SYMBOL(sock_cmsg_send);
1966
5640f768
ED		 1967/* On 32bit arches, an skb frag is limited to 2^15 */
1968#define SKB_FRAG_PAGE_ORDER get_order(32768)
1969
400dfd3a
ED		 1970/**
1971 * skb_page_frag_refill - check that a page_frag contains enough room
1972 * @sz: minimum size of the fragment we want to get
1973 * @pfrag: pointer to page_frag
82d5e2b8 1974 * @gfp: priority for memory allocation
400dfd3a
ED		 1975 *
1976 * Note: While this allocator tries to use high order pages, there is
1977 * no guarantee that allocations succeed. Therefore, @sz MUST be
1978 * less or equal than PAGE_SIZE.
1979 */
d9b2938a 1980bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 1981{
5640f768 1982 if (pfrag->page) {
fe896d18 1983 if (page_ref_count(pfrag->page) == 1) {
5640f768
ED		 1984 pfrag->offset = 0;
1985 return true;
1986 }
400dfd3a 1987 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1988 return true;
1989 put_page(pfrag->page);
1990 }
1991
d9b2938a
ED		 1992 pfrag->offset = 0;
1993 if (SKB_FRAG_PAGE_ORDER) {
d0164adc
MG		 1994 /* Avoid direct reclaim but allow kswapd to wake */
1995 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
1996 __GFP_COMP | __GFP_NOWARN |
1997 __GFP_NORETRY,
d9b2938a 1998 SKB_FRAG_PAGE_ORDER);
5640f768 1999 if (likely(pfrag->page)) {
d9b2938a 2000 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 2001 return true;
2002 }
d9b2938a
ED		 2003 }
2004 pfrag->page = alloc_page(gfp);
2005 if (likely(pfrag->page)) {
2006 pfrag->size = PAGE_SIZE;
2007 return true;
2008 }
400dfd3a
ED		 2009 return false;
2010}
2011EXPORT_SYMBOL(skb_page_frag_refill);
2012
2013bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2014{
2015 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2016 return true;
2017
5640f768
ED		 2018 sk_enter_memory_pressure(sk);
2019 sk_stream_moderate_sndbuf(sk);
2020 return false;
2021}
2022EXPORT_SYMBOL(sk_page_frag_refill);
2023
1da177e4 2024static void __lock_sock(struct sock *sk)
f39234d6
NK		 2025 __releases(&sk->sk_lock.slock)
2026 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 2027{
2028 DEFINE_WAIT(wait);
2029
e71a4783 2030 for (;;) {
1da177e4
LT		 2031 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2032 TASK_UNINTERRUPTIBLE);
2033 spin_unlock_bh(&sk->sk_lock.slock);
2034 schedule();
2035 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 2036 if (!sock_owned_by_user(sk))
1da177e4
LT		 2037 break;
2038 }
2039 finish_wait(&sk->sk_lock.wq, &wait);
2040}
2041
2042static void __release_sock(struct sock *sk)
f39234d6
NK		 2043 __releases(&sk->sk_lock.slock)
2044 __acquires(&sk->sk_lock.slock)
1da177e4 2045{
5413d1ba 2046 struct sk_buff *skb, *next;
1da177e4 2047
5413d1ba 2048 while ((skb = sk->sk_backlog.head) != NULL) {
1da177e4 2049 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1da177e4 2050
5413d1ba 2051 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4 2052
5413d1ba
ED		 2053 do {
2054 next = skb->next;
e4cbb02a 2055 prefetch(next);
7fee226a 2056 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 2057 skb->next = NULL;
c57943a1 2058 sk_backlog_rcv(sk, skb);
1da177e4 2059
5413d1ba 2060 cond_resched();
1da177e4
LT		 2061
2062 skb = next;
2063 } while (skb != NULL);
2064
5413d1ba
ED		 2065 spin_lock_bh(&sk->sk_lock.slock);
2066 }
8eae939f
ZY		 2067
2068 /*
2069 * Doing the zeroing here guarantee we can not loop forever
2070 * while a wild producer attempts to flood us.
2071 */
2072 sk->sk_backlog.len = 0;
1da177e4
LT		 2073}
2074
d41a69f1
ED		 2075void __sk_flush_backlog(struct sock *sk)
2076{
2077 spin_lock_bh(&sk->sk_lock.slock);
2078 __release_sock(sk);
2079 spin_unlock_bh(&sk->sk_lock.slock);
2080}
2081
1da177e4
LT		 2082/**
2083 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 2084 * @sk: sock to wait on
2085 * @timeo: for how long
dfbafc99 2086 * @skb: last skb seen on sk_receive_queue
1da177e4
LT		 2087 *
2088 * Now socket state including sk->sk_err is changed only under lock,
2089 * hence we may omit checks after joining wait queue.
2090 * We check receive queue before schedule() only as optimization;
2091 * it is very likely that release_sock() added new data.
2092 */
dfbafc99 2093int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
1da177e4
LT		 2094{
2095 int rc;
2096 DEFINE_WAIT(wait);
2097
aa395145 2098 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9cd3e072 2099 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
dfbafc99 2100 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb);
9cd3e072 2101 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
aa395145 2102 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 2103 return rc;
2104}
1da177e4
LT		 2105EXPORT_SYMBOL(sk_wait_data);
2106
3ab224be
HA		 2107/**
2108 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2109 * @sk: socket
2110 * @size: memory size to allocate
2111 * @kind: allocation type
2112 *
2113 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2114 * rmem allocation. This function assumes that protocols which have
2115 * memory_pressure use sk_wmem_queued as write buffer accounting.
2116 */
2117int __sk_mem_schedule(struct sock *sk, int size, int kind)
2118{
2119 struct proto *prot = sk->sk_prot;
2120 int amt = sk_mem_pages(size);
8d987e5c 2121 long allocated;
3ab224be
HA		 2122
2123 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 2124
e805605c
JW		 2125 allocated = sk_memory_allocated_add(sk, amt);
2126
baac50bb
JW		 2127 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2128 !mem_cgroup_charge_skmem(sk->sk_memcg, amt))
e805605c 2129 goto suppress_allocation;
3ab224be
HA		 2130
2131 /* Under limit. */
e805605c 2132 if (allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2133 sk_leave_memory_pressure(sk);
3ab224be
HA		 2134 return 1;
2135 }
2136
e805605c
JW		 2137 /* Under pressure. */
2138 if (allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2139 sk_enter_memory_pressure(sk);
3ab224be 2140
e805605c
JW		 2141 /* Over hard limit. */
2142 if (allocated > sk_prot_mem_limits(sk, 2))
3ab224be
HA		 2143 goto suppress_allocation;
2144
2145 /* guarantee minimum buffer size under pressure */
2146 if (kind == SK_MEM_RECV) {
2147 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2148 return 1;
180d8cd9 2149
3ab224be
HA		 2150 } else { /* SK_MEM_SEND */
2151 if (sk->sk_type == SOCK_STREAM) {
2152 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2153 return 1;
2154 } else if (atomic_read(&sk->sk_wmem_alloc) <
2155 prot->sysctl_wmem[0])
2156 return 1;
2157 }
2158
180d8cd9 2159 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2160 int alloc;
2161
180d8cd9 2162 if (!sk_under_memory_pressure(sk))
1748376b 2163 return 1;
180d8cd9
GC		 2164 alloc = sk_sockets_allocated_read_positive(sk);
2165 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2166 sk_mem_pages(sk->sk_wmem_queued +
2167 atomic_read(&sk->sk_rmem_alloc) +
2168 sk->sk_forward_alloc))
2169 return 1;
2170 }
2171
2172suppress_allocation:
2173
2174 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2175 sk_stream_moderate_sndbuf(sk);
2176
2177 /* Fail only if socket is _under_ its sndbuf.
2178 * In this case we cannot block, so that we have to fail.
2179 */
2180 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2181 return 1;
2182 }
2183
3847ce32
SM		 2184 trace_sock_exceed_buf_limit(sk, prot, allocated);
2185
3ab224be
HA		 2186 /* Alas. Undo changes. */
2187 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2188
0e90b31f 2189 sk_memory_allocated_sub(sk, amt);
180d8cd9 2190
baac50bb
JW		 2191 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2192 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
e805605c 2193
3ab224be
HA		 2194 return 0;
2195}
3ab224be
HA		 2196EXPORT_SYMBOL(__sk_mem_schedule);
2197
2198/**
69dba9bb 2199 * __sk_mem_reclaim - reclaim memory_allocated
3ab224be 2200 * @sk: socket
1a24e04e 2201 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
3ab224be 2202 */
1a24e04e 2203void __sk_mem_reclaim(struct sock *sk, int amount)
3ab224be 2204{
1a24e04e
ED		 2205 amount >>= SK_MEM_QUANTUM_SHIFT;
2206 sk_memory_allocated_sub(sk, amount);
2207 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
3ab224be 2208
baac50bb
JW		 2209 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2210 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
e805605c 2211
180d8cd9
GC		 2212 if (sk_under_memory_pressure(sk) &&
2213 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2214 sk_leave_memory_pressure(sk);
3ab224be 2215}
3ab224be
HA		 2216EXPORT_SYMBOL(__sk_mem_reclaim);
2217
627d2d6b 2218int sk_set_peek_off(struct sock *sk, int val)
2219{
2220 if (val < 0)
2221 return -EINVAL;
2222
2223 sk->sk_peek_off = val;
2224 return 0;
2225}
2226EXPORT_SYMBOL_GPL(sk_set_peek_off);
3ab224be 2227
1da177e4
LT		 2228/*
2229 * Set of default routines for initialising struct proto_ops when
2230 * the protocol does not support a particular function. In certain
2231 * cases where it makes no sense for a protocol to have a "do nothing"
2232 * function, some default processing is provided.
2233 */
2234
2235int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2236{
2237 return -EOPNOTSUPP;
2238}
2a91525c 2239EXPORT_SYMBOL(sock_no_bind);
1da177e4 2240
4ec93edb 2241int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2242 int len, int flags)
2243{
2244 return -EOPNOTSUPP;
2245}
2a91525c 2246EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2247
2248int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2249{
2250 return -EOPNOTSUPP;
2251}
2a91525c 2252EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2253
2254int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2255{
2256 return -EOPNOTSUPP;
2257}
2a91525c 2258EXPORT_SYMBOL(sock_no_accept);
1da177e4 2259
4ec93edb 2260int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2261 int *len, int peer)
2262{
2263 return -EOPNOTSUPP;
2264}
2a91525c 2265EXPORT_SYMBOL(sock_no_getname);
1da177e4 2266
2a91525c 2267unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2268{
2269 return 0;
2270}
2a91525c 2271EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2272
2273int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2274{
2275 return -EOPNOTSUPP;
2276}
2a91525c 2277EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2278
2279int sock_no_listen(struct socket *sock, int backlog)
2280{
2281 return -EOPNOTSUPP;
2282}
2a91525c 2283EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2284
2285int sock_no_shutdown(struct socket *sock, int how)
2286{
2287 return -EOPNOTSUPP;
2288}
2a91525c 2289EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2290
2291int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2292 char __user *optval, unsigned int optlen)
1da177e4
LT		 2293{
2294 return -EOPNOTSUPP;
2295}
2a91525c 2296EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2297
2298int sock_no_getsockopt(struct socket *sock, int level, int optname,
2299 char __user *optval, int __user *optlen)
2300{
2301 return -EOPNOTSUPP;
2302}
2a91525c 2303EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4 2304
1b784140 2305int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
1da177e4
LT		 2306{
2307 return -EOPNOTSUPP;
2308}
2a91525c 2309EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4 2310
1b784140
YX		 2311int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2312 int flags)
1da177e4
LT		 2313{
2314 return -EOPNOTSUPP;
2315}
2a91525c 2316EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2317
2318int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2319{
2320 /* Mirror missing mmap method error code */
2321 return -ENODEV;
2322}
2a91525c 2323EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2324
2325ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2326{
2327 ssize_t res;
2328 struct msghdr msg = {.msg_flags = flags};
2329 struct kvec iov;
2330 char *kaddr = kmap(page);
2331 iov.iov_base = kaddr + offset;
2332 iov.iov_len = size;
2333 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2334 kunmap(page);
2335 return res;
2336}
2a91525c 2337EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2338
2339/*
2340 * Default Socket Callbacks
2341 */
2342
2343static void sock_def_wakeup(struct sock *sk)
2344{
43815482
ED		 2345 struct socket_wq *wq;
2346
2347 rcu_read_lock();
2348 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2349 if (skwq_has_sleeper(wq))
43815482
ED		 2350 wake_up_interruptible_all(&wq->wait);
2351 rcu_read_unlock();
1da177e4
LT		 2352}
2353
2354static void sock_def_error_report(struct sock *sk)
2355{
43815482
ED		 2356 struct socket_wq *wq;
2357
2358 rcu_read_lock();
2359 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2360 if (skwq_has_sleeper(wq))
43815482 2361 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2362 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2363 rcu_read_unlock();
1da177e4
LT		 2364}
2365
676d2369 2366static void sock_def_readable(struct sock *sk)
1da177e4 2367{
43815482
ED		 2368 struct socket_wq *wq;
2369
2370 rcu_read_lock();
2371 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2372 if (skwq_has_sleeper(wq))
2c6607c6 2373 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2374 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2375 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2376 rcu_read_unlock();
1da177e4
LT		 2377}
2378
2379static void sock_def_write_space(struct sock *sk)
2380{
43815482
ED		 2381 struct socket_wq *wq;
2382
2383 rcu_read_lock();
1da177e4
LT		 2384
2385 /* Do not wake up a writer until he can make "significant"
2386 * progress. --DaveM
2387 */
e71a4783 2388 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482 2389 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2390 if (skwq_has_sleeper(wq))
43815482 2391 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2392 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2393
2394 /* Should agree with poll, otherwise some programs break */
2395 if (sock_writeable(sk))
8d8ad9d7 2396 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2397 }
2398
43815482 2399 rcu_read_unlock();
1da177e4
LT		 2400}
2401
2402static void sock_def_destruct(struct sock *sk)
2403{
1da177e4
LT		 2404}
2405
2406void sk_send_sigurg(struct sock *sk)
2407{
2408 if (sk->sk_socket && sk->sk_socket->file)
2409 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2410 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2411}
2a91525c 2412EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2413
2414void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2415 unsigned long expires)
2416{
2417 if (!mod_timer(timer, expires))
2418 sock_hold(sk);
2419}
1da177e4
LT		 2420EXPORT_SYMBOL(sk_reset_timer);
2421
2422void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2423{
25cc4ae9 2424 if (del_timer(timer))
1da177e4
LT		 2425 __sock_put(sk);
2426}
1da177e4
LT		 2427EXPORT_SYMBOL(sk_stop_timer);
2428
2429void sock_init_data(struct socket *sock, struct sock *sk)
2430{
2431 skb_queue_head_init(&sk->sk_receive_queue);
2432 skb_queue_head_init(&sk->sk_write_queue);
2433 skb_queue_head_init(&sk->sk_error_queue);
2434
2435 sk->sk_send_head = NULL;
2436
2437 init_timer(&sk->sk_timer);
4ec93edb 2438
1da177e4
LT		 2439 sk->sk_allocation = GFP_KERNEL;
2440 sk->sk_rcvbuf = sysctl_rmem_default;
2441 sk->sk_sndbuf = sysctl_wmem_default;
2442 sk->sk_state = TCP_CLOSE;
972692e0 2443 sk_set_socket(sk, sock);
1da177e4
LT		 2444
2445 sock_set_flag(sk, SOCK_ZAPPED);
2446
e71a4783 2447 if (sock) {
1da177e4 2448 sk->sk_type = sock->type;
43815482 2449 sk->sk_wq = sock->wq;
1da177e4
LT		 2450 sock->sk = sk;
2451 } else
43815482 2452 sk->sk_wq = NULL;
1da177e4 2453
1da177e4 2454 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2455 lockdep_set_class_and_name(&sk->sk_callback_lock,
2456 af_callback_keys + sk->sk_family,
2457 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2458
2459 sk->sk_state_change = sock_def_wakeup;
2460 sk->sk_data_ready = sock_def_readable;
2461 sk->sk_write_space = sock_def_write_space;
2462 sk->sk_error_report = sock_def_error_report;
2463 sk->sk_destruct = sock_def_destruct;
2464
5640f768
ED		 2465 sk->sk_frag.page = NULL;
2466 sk->sk_frag.offset = 0;
ef64a54f 2467 sk->sk_peek_off = -1;
1da177e4 2468
109f6e39
EB		 2469 sk->sk_peer_pid = NULL;
2470 sk->sk_peer_cred = NULL;
1da177e4
LT		 2471 sk->sk_write_pending = 0;
2472 sk->sk_rcvlowat = 1;
2473 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2474 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2475
f37f0afb 2476 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2477
e0d1095a 2478#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2479 sk->sk_napi_id = 0;
64b0dc51 2480 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2481#endif
2482
62748f32 2483 sk->sk_max_pacing_rate = ~0U;
7eec4174 2484 sk->sk_pacing_rate = ~0U;
70da268b 2485 sk->sk_incoming_cpu = -1;
4dc6dc71
ED		 2486 /*
2487 * Before updating sk_refcnt, we must commit prior changes to memory
2488 * (Documentation/RCU/rculist_nulls.txt for details)
2489 */
2490 smp_wmb();
1da177e4 2491 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2492 atomic_set(&sk->sk_drops, 0);
1da177e4 2493}
2a91525c 2494EXPORT_SYMBOL(sock_init_data);
1da177e4 2495
b5606c2d 2496void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2497{
2498 might_sleep();
a5b5bb9a 2499 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2500 if (sk->sk_lock.owned)
1da177e4 2501 __lock_sock(sk);
d2e9117c 2502 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2503 spin_unlock(&sk->sk_lock.slock);
2504 /*
2505 * The sk_lock has mutex_lock() semantics here:
2506 */
fcc70d5f 2507 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2508 local_bh_enable();
1da177e4 2509}
fcc70d5f 2510EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2511
b5606c2d 2512void release_sock(struct sock *sk)
1da177e4 2513{
a5b5bb9a 2514 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2515 if (sk->sk_backlog.tail)
2516 __release_sock(sk);
46d3ceab 2517
c3f9b018
ED		 2518 /* Warning : release_cb() might need to release sk ownership,
2519 * ie call sock_release_ownership(sk) before us.
2520 */
46d3ceab
ED		 2521 if (sk->sk_prot->release_cb)
2522 sk->sk_prot->release_cb(sk);
2523
c3f9b018 2524 sock_release_ownership(sk);
a5b5bb9a
IM		 2525 if (waitqueue_active(&sk->sk_lock.wq))
2526 wake_up(&sk->sk_lock.wq);
2527 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2528}
2529EXPORT_SYMBOL(release_sock);
2530
8a74ad60
ED		 2531/**
2532 * lock_sock_fast - fast version of lock_sock
2533 * @sk: socket
2534 *
2535 * This version should be used for very small section, where process wont block
2536 * return false if fast path is taken
2537 * sk_lock.slock locked, owned = 0, BH disabled
2538 * return true if slow path is taken
2539 * sk_lock.slock unlocked, owned = 1, BH enabled
2540 */
2541bool lock_sock_fast(struct sock *sk)
2542{
2543 might_sleep();
2544 spin_lock_bh(&sk->sk_lock.slock);
2545
2546 if (!sk->sk_lock.owned)
2547 /*
2548 * Note : We must disable BH
2549 */
2550 return false;
2551
2552 __lock_sock(sk);
2553 sk->sk_lock.owned = 1;
2554 spin_unlock(&sk->sk_lock.slock);
2555 /*
2556 * The sk_lock has mutex_lock() semantics here:
2557 */
2558 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2559 local_bh_enable();
2560 return true;
2561}
2562EXPORT_SYMBOL(lock_sock_fast);
2563
1da177e4 2564int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2565{
b7aa0bf7 2566 struct timeval tv;
1da177e4 2567 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2568 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2569 tv = ktime_to_timeval(sk->sk_stamp);
2570 if (tv.tv_sec == -1)
1da177e4 2571 return -ENOENT;
b7aa0bf7
ED		 2572 if (tv.tv_sec == 0) {
2573 sk->sk_stamp = ktime_get_real();
2574 tv = ktime_to_timeval(sk->sk_stamp);
2575 }
2576 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2577}
1da177e4
LT		 2578EXPORT_SYMBOL(sock_get_timestamp);
2579
ae40eb1e
ED		 2580int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2581{
2582 struct timespec ts;
2583 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2584 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2585 ts = ktime_to_timespec(sk->sk_stamp);
2586 if (ts.tv_sec == -1)
2587 return -ENOENT;
2588 if (ts.tv_sec == 0) {
2589 sk->sk_stamp = ktime_get_real();
2590 ts = ktime_to_timespec(sk->sk_stamp);
2591 }
2592 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2593}
2594EXPORT_SYMBOL(sock_get_timestampns);
2595
20d49473 2596void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2597{
20d49473 2598 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2599 unsigned long previous_flags = sk->sk_flags;
2600
20d49473
PO		 2601 sock_set_flag(sk, flag);
2602 /*
2603 * we just set one of the two flags which require net
2604 * time stamping, but time stamping might have been on
2605 * already because of the other one
2606 */
080a270f
HFS		 2607 if (sock_needs_netstamp(sk) &&
2608 !(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2609 net_enable_timestamp();
1da177e4
LT		 2610 }
2611}
1da177e4 2612
cb820f8e
RC		 2613int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2614 int level, int type)
2615{
2616 struct sock_exterr_skb *serr;
364a9e93 2617 struct sk_buff *skb;
cb820f8e
RC		 2618 int copied, err;
2619
2620 err = -EAGAIN;
364a9e93 2621 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 2622 if (skb == NULL)
2623 goto out;
2624
2625 copied = skb->len;
2626 if (copied > len) {
2627 msg->msg_flags |= MSG_TRUNC;
2628 copied = len;
2629 }
51f3d02b 2630 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 2631 if (err)
2632 goto out_free_skb;
2633
2634 sock_recv_timestamp(msg, sk, skb);
2635
2636 serr = SKB_EXT_ERR(skb);
2637 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2638
2639 msg->msg_flags |= MSG_ERRQUEUE;
2640 err = copied;
2641
cb820f8e
RC		 2642out_free_skb:
2643 kfree_skb(skb);
2644out:
2645 return err;
2646}
2647EXPORT_SYMBOL(sock_recv_errqueue);
2648
1da177e4
LT		 2649/*
2650 * Get a socket option on an socket.
2651 *
2652 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2653 * asynchronous errors should be reported by getsockopt. We assume
2654 * this means if you specify SO_ERROR (otherwise whats the point of it).
2655 */
2656int sock_common_getsockopt(struct socket *sock, int level, int optname,
2657 char __user *optval, int __user *optlen)
2658{
2659 struct sock *sk = sock->sk;
2660
2661 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2662}
1da177e4
LT		 2663EXPORT_SYMBOL(sock_common_getsockopt);
2664
3fdadf7d 2665#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2666int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2667 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2668{
2669 struct sock *sk = sock->sk;
2670
1e51f951 2671 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2672 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2673 optval, optlen);
3fdadf7d
DM		 2674 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2675}
2676EXPORT_SYMBOL(compat_sock_common_getsockopt);
2677#endif
2678
1b784140
YX		 2679int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2680 int flags)
1da177e4
LT		 2681{
2682 struct sock *sk = sock->sk;
2683 int addr_len = 0;
2684 int err;
2685
1b784140 2686 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
1da177e4
LT		 2687 flags & ~MSG_DONTWAIT, &addr_len);
2688 if (err >= 0)
2689 msg->msg_namelen = addr_len;
2690 return err;
2691}
1da177e4
LT		 2692EXPORT_SYMBOL(sock_common_recvmsg);
2693
2694/*
2695 * Set socket options on an inet socket.
2696 */
2697int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2698 char __user *optval, unsigned int optlen)
1da177e4
LT		 2699{
2700 struct sock *sk = sock->sk;
2701
2702 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2703}
1da177e4
LT		 2704EXPORT_SYMBOL(sock_common_setsockopt);
2705
3fdadf7d 2706#ifdef CONFIG_COMPAT
543d9cfe 2707int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2708 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2709{
2710 struct sock *sk = sock->sk;
2711
543d9cfe
ACM		 2712 if (sk->sk_prot->compat_setsockopt != NULL)
2713 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2714 optval, optlen);
3fdadf7d
DM		 2715 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2716}
2717EXPORT_SYMBOL(compat_sock_common_setsockopt);
2718#endif
2719
1da177e4
LT		 2720void sk_common_release(struct sock *sk)
2721{
2722 if (sk->sk_prot->destroy)
2723 sk->sk_prot->destroy(sk);
2724
2725 /*
2726 * Observation: when sock_common_release is called, processes have
2727 * no access to socket. But net still has.
2728 * Step one, detach it from networking:
2729 *
2730 * A. Remove from hash tables.
2731 */
2732
2733 sk->sk_prot->unhash(sk);
2734
2735 /*
2736 * In this point socket cannot receive new packets, but it is possible
2737 * that some packets are in flight because some CPU runs receiver and
2738 * did hash table lookup before we unhashed socket. They will achieve
2739 * receive queue and will be purged by socket destructor.
2740 *
2741 * Also we still have packets pending on receive queue and probably,
2742 * our own packets waiting in device queues. sock_destroy will drain
2743 * receive queue, but transmitted packets will delay socket destruction
2744 * until the last reference will be released.
2745 */
2746
2747 sock_orphan(sk);
2748
2749 xfrm_sk_free_policy(sk);
2750
e6848976 2751 sk_refcnt_debug_release(sk);
5640f768
ED		 2752
2753 if (sk->sk_frag.page) {
2754 put_page(sk->sk_frag.page);
2755 sk->sk_frag.page = NULL;
2756 }
2757
1da177e4
LT		 2758 sock_put(sk);
2759}
1da177e4
LT		 2760EXPORT_SYMBOL(sk_common_release);
2761
13ff3d6f
PE		 2762#ifdef CONFIG_PROC_FS
2763#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2764struct prot_inuse {
2765 int val[PROTO_INUSE_NR];
2766};
13ff3d6f
PE		 2767
2768static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2769
2770#ifdef CONFIG_NET_NS
2771void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2772{
d6d9ca0f 2773 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2774}
2775EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2776
2777int sock_prot_inuse_get(struct net *net, struct proto *prot)
2778{
2779 int cpu, idx = prot->inuse_idx;
2780 int res = 0;
2781
2782 for_each_possible_cpu(cpu)
2783 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2784
2785 return res >= 0 ? res : 0;
2786}
2787EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2788
2c8c1e72 2789static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2790{
2791 net->core.inuse = alloc_percpu(struct prot_inuse);
2792 return net->core.inuse ? 0 : -ENOMEM;
2793}
2794
2c8c1e72 2795static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2796{
2797 free_percpu(net->core.inuse);
2798}
2799
2800static struct pernet_operations net_inuse_ops = {
2801 .init = sock_inuse_init_net,
2802 .exit = sock_inuse_exit_net,
2803};
2804
2805static __init int net_inuse_init(void)
2806{
2807 if (register_pernet_subsys(&net_inuse_ops))
2808 panic("Cannot initialize net inuse counters");
2809
2810 return 0;
2811}
2812
2813core_initcall(net_inuse_init);
2814#else
1338d466
PE		 2815static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2816
c29a0bc4 2817void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2818{
d6d9ca0f 2819 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2820}
2821EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2822
c29a0bc4 2823int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2824{
2825 int cpu, idx = prot->inuse_idx;
2826 int res = 0;
2827
2828 for_each_possible_cpu(cpu)
2829 res += per_cpu(prot_inuse, cpu).val[idx];
2830
2831 return res >= 0 ? res : 0;
2832}
2833EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2834#endif
13ff3d6f
PE		 2835
2836static void assign_proto_idx(struct proto *prot)
2837{
2838 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2839
2840 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2841 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2842 return;
2843 }
2844
2845 set_bit(prot->inuse_idx, proto_inuse_idx);
2846}
2847
2848static void release_proto_idx(struct proto *prot)
2849{
2850 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2851 clear_bit(prot->inuse_idx, proto_inuse_idx);
2852}
2853#else
2854static inline void assign_proto_idx(struct proto *prot)
2855{
2856}
2857
2858static inline void release_proto_idx(struct proto *prot)
2859{
2860}
2861#endif
2862
0159dfd3
ED		 2863static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
2864{
2865 if (!rsk_prot)
2866 return;
2867 kfree(rsk_prot->slab_name);
2868 rsk_prot->slab_name = NULL;
adf78eda
JL		 2869 kmem_cache_destroy(rsk_prot->slab);
2870 rsk_prot->slab = NULL;
0159dfd3
ED		 2871}
2872
2873static int req_prot_init(const struct proto *prot)
2874{
2875 struct request_sock_ops *rsk_prot = prot->rsk_prot;
2876
2877 if (!rsk_prot)
2878 return 0;
2879
2880 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
2881 prot->name);
2882 if (!rsk_prot->slab_name)
2883 return -ENOMEM;
2884
2885 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
2886 rsk_prot->obj_size, 0,
e96f78ab 2887 prot->slab_flags, NULL);
0159dfd3
ED		 2888
2889 if (!rsk_prot->slab) {
2890 pr_crit("%s: Can't create request sock SLAB cache!\n",
2891 prot->name);
2892 return -ENOMEM;
2893 }
2894 return 0;
2895}
2896
b733c007
PE		 2897int proto_register(struct proto *prot, int alloc_slab)
2898{
1da177e4
LT		 2899 if (alloc_slab) {
2900 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2901 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2902 NULL);
1da177e4
LT		 2903
2904 if (prot->slab == NULL) {
e005d193
JP		 2905 pr_crit("%s: Can't create sock SLAB cache!\n",
2906 prot->name);
60e7663d 2907 goto out;
1da177e4 2908 }
2e6599cb 2909
0159dfd3
ED		 2910 if (req_prot_init(prot))
2911 goto out_free_request_sock_slab;
8feaf0c0 2912
6d6ee43e 2913 if (prot->twsk_prot != NULL) {
faf23422 2914 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2915
7e56b5d6 2916 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2917 goto out_free_request_sock_slab;
2918
6d6ee43e 2919 prot->twsk_prot->twsk_slab =
7e56b5d6 2920 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2921 prot->twsk_prot->twsk_obj_size,
3ab5aee7 2922 0,
52db70dc 2923 prot->slab_flags,
20c2df83 2924 NULL);
6d6ee43e 2925 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2926 goto out_free_timewait_sock_slab_name;
2927 }
1da177e4
LT		 2928 }
2929
36b77a52 2930 mutex_lock(&proto_list_mutex);
1da177e4 2931 list_add(&prot->node, &proto_list);
13ff3d6f 2932 assign_proto_idx(prot);
36b77a52 2933 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2934 return 0;
2935
8feaf0c0 2936out_free_timewait_sock_slab_name:
7e56b5d6 2937 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0 2938out_free_request_sock_slab:
0159dfd3
ED		 2939 req_prot_cleanup(prot->rsk_prot);
2940
2e6599cb
ACM		 2941 kmem_cache_destroy(prot->slab);
2942 prot->slab = NULL;
b733c007
PE		 2943out:
2944 return -ENOBUFS;
1da177e4 2945}
1da177e4
LT		 2946EXPORT_SYMBOL(proto_register);
2947
2948void proto_unregister(struct proto *prot)
2949{
36b77a52 2950 mutex_lock(&proto_list_mutex);
13ff3d6f 2951 release_proto_idx(prot);
0a3f4358 2952 list_del(&prot->node);
36b77a52 2953 mutex_unlock(&proto_list_mutex);
1da177e4 2954
adf78eda
JL		 2955 kmem_cache_destroy(prot->slab);
2956 prot->slab = NULL;
1da177e4 2957
0159dfd3 2958 req_prot_cleanup(prot->rsk_prot);
2e6599cb 2959
6d6ee43e 2960 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2961 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2962 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2963 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2964 }
1da177e4 2965}
1da177e4
LT		 2966EXPORT_SYMBOL(proto_unregister);
2967
2968#ifdef CONFIG_PROC_FS
1da177e4 2969static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2970 __acquires(proto_list_mutex)
1da177e4 2971{
36b77a52 2972 mutex_lock(&proto_list_mutex);
60f0438a 2973 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2974}
2975
2976static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2977{
60f0438a 2978 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2979}
2980
2981static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2982 __releases(proto_list_mutex)
1da177e4 2983{
36b77a52 2984 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2985}
2986
2987static char proto_method_implemented(const void *method)
2988{
2989 return method == NULL ? 'n' : 'y';
2990}
180d8cd9
GC		 2991static long sock_prot_memory_allocated(struct proto *proto)
2992{
cb75a36c 2993 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2994}
2995
2996static char *sock_prot_memory_pressure(struct proto *proto)
2997{
2998 return proto->memory_pressure != NULL ?
2999 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
3000}
1da177e4
LT		 3001
3002static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
3003{
180d8cd9 3004
8d987e5c 3005 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 3006 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3007 proto->name,
3008 proto->obj_size,
14e943db 3009 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 3010 sock_prot_memory_allocated(proto),
3011 sock_prot_memory_pressure(proto),
1da177e4
LT		 3012 proto->max_header,
3013 proto->slab == NULL ? "no" : "yes",
3014 module_name(proto->owner),
3015 proto_method_implemented(proto->close),
3016 proto_method_implemented(proto->connect),
3017 proto_method_implemented(proto->disconnect),
3018 proto_method_implemented(proto->accept),
3019 proto_method_implemented(proto->ioctl),
3020 proto_method_implemented(proto->init),
3021 proto_method_implemented(proto->destroy),
3022 proto_method_implemented(proto->shutdown),
3023 proto_method_implemented(proto->setsockopt),
3024 proto_method_implemented(proto->getsockopt),
3025 proto_method_implemented(proto->sendmsg),
3026 proto_method_implemented(proto->recvmsg),
3027 proto_method_implemented(proto->sendpage),
3028 proto_method_implemented(proto->bind),
3029 proto_method_implemented(proto->backlog_rcv),
3030 proto_method_implemented(proto->hash),
3031 proto_method_implemented(proto->unhash),
3032 proto_method_implemented(proto->get_port),
3033 proto_method_implemented(proto->enter_memory_pressure));
3034}
3035
3036static int proto_seq_show(struct seq_file *seq, void *v)
3037{
60f0438a 3038 if (v == &proto_list)
1da177e4
LT		 3039 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3040 "protocol",
3041 "size",
3042 "sockets",
3043 "memory",
3044 "press",
3045 "maxhdr",
3046 "slab",
3047 "module",
3048 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3049 else
60f0438a 3050 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 3051 return 0;
3052}
3053
f690808e 3054static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 3055 .start = proto_seq_start,
3056 .next = proto_seq_next,
3057 .stop = proto_seq_stop,
3058 .show = proto_seq_show,
3059};
3060
3061static int proto_seq_open(struct inode *inode, struct file *file)
3062{
14e943db
ED		 3063 return seq_open_net(inode, file, &proto_seq_ops,
3064 sizeof(struct seq_net_private));
1da177e4
LT		 3065}
3066
9a32144e 3067static const struct file_operations proto_seq_fops = {
1da177e4
LT		 3068 .owner = THIS_MODULE,
3069 .open = proto_seq_open,
3070 .read = seq_read,
3071 .llseek = seq_lseek,
14e943db
ED		 3072 .release = seq_release_net,
3073};
3074
3075static __net_init int proto_init_net(struct net *net)
3076{
d4beaa66 3077 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 3078 return -ENOMEM;
3079
3080 return 0;
3081}
3082
3083static __net_exit void proto_exit_net(struct net *net)
3084{
ece31ffd 3085 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 3086}
3087
3088
3089static __net_initdata struct pernet_operations proto_net_ops = {
3090 .init = proto_init_net,
3091 .exit = proto_exit_net,
1da177e4
LT		 3092};
3093
3094static int __init proto_init(void)
3095{
14e943db 3096 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 3097}
3098
3099subsys_initcall(proto_init);
3100
3101#endif /* PROC_FS */
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