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Replace <asm/uaccess.h> with <linux/uaccess.h> globally
[mirror_ubuntu-bionic-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 120
7c0f6ba6 121#include <linux/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
4f0c40d9 455int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
c3f24cfb 456 const int nested, unsigned int trim_cap, bool refcounted)
f0088a50
DV		 457{
458 int rc = NET_RX_SUCCESS;
459
4f0c40d9 460 if (sk_filter_trim_cap(sk, skb, trim_cap))
f0088a50
DV		 461 goto discard_and_relse;
462
463 skb->dev = NULL;
464
274f482d 465 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 466 atomic_inc(&sk->sk_drops);
467 goto discard_and_relse;
468 }
58a5a7b9
ACM		 469 if (nested)
470 bh_lock_sock_nested(sk);
471 else
472 bh_lock_sock(sk);
a5b5bb9a
IM		 473 if (!sock_owned_by_user(sk)) {
474 /*
475 * trylock + unlock semantics:
476 */
477 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
478
c57943a1 479 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 480
481 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 482 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 483 bh_unlock_sock(sk);
484 atomic_inc(&sk->sk_drops);
485 goto discard_and_relse;
486 }
487
f0088a50
DV		 488 bh_unlock_sock(sk);
489out:
c3f24cfb
ED		 490 if (refcounted)
491 sock_put(sk);
f0088a50
DV		 492 return rc;
493discard_and_relse:
494 kfree_skb(skb);
495 goto out;
496}
4f0c40d9 497EXPORT_SYMBOL(__sk_receive_skb);
f0088a50
DV		 498
499struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
500{
b6c6712a 501 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 502
503 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 504 sk_tx_queue_clear(sk);
a9b3cd7f 505 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 506 dst_release(dst);
507 return NULL;
508 }
509
510 return dst;
511}
512EXPORT_SYMBOL(__sk_dst_check);
513
514struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
515{
516 struct dst_entry *dst = sk_dst_get(sk);
517
518 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
519 sk_dst_reset(sk);
520 dst_release(dst);
521 return NULL;
522 }
523
524 return dst;
525}
526EXPORT_SYMBOL(sk_dst_check);
527
c91f6df2
BH		 528static int sock_setbindtodevice(struct sock *sk, char __user *optval,
529 int optlen)
4878809f
DM		 530{
531 int ret = -ENOPROTOOPT;
532#ifdef CONFIG_NETDEVICES
3b1e0a65 533 struct net *net = sock_net(sk);
4878809f
DM		 534 char devname[IFNAMSIZ];
535 int index;
536
537 /* Sorry... */
538 ret = -EPERM;
5e1fccc0 539 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 540 goto out;
541
542 ret = -EINVAL;
543 if (optlen < 0)
544 goto out;
545
546 /* Bind this socket to a particular device like "eth0",
547 * as specified in the passed interface name. If the
548 * name is "" or the option length is zero the socket
549 * is not bound.
550 */
551 if (optlen > IFNAMSIZ - 1)
552 optlen = IFNAMSIZ - 1;
553 memset(devname, 0, sizeof(devname));
554
555 ret = -EFAULT;
556 if (copy_from_user(devname, optval, optlen))
557 goto out;
558
000ba2e4
DM		 559 index = 0;
560 if (devname[0] != '\0') {
bf8e56bf 561 struct net_device *dev;
4878809f 562
bf8e56bf
ED		 563 rcu_read_lock();
564 dev = dev_get_by_name_rcu(net, devname);
565 if (dev)
566 index = dev->ifindex;
567 rcu_read_unlock();
4878809f
DM		 568 ret = -ENODEV;
569 if (!dev)
570 goto out;
4878809f
DM		 571 }
572
573 lock_sock(sk);
574 sk->sk_bound_dev_if = index;
575 sk_dst_reset(sk);
576 release_sock(sk);
577
578 ret = 0;
579
580out:
581#endif
582
583 return ret;
584}
585
c91f6df2
BH		 586static int sock_getbindtodevice(struct sock *sk, char __user *optval,
587 int __user *optlen, int len)
588{
589 int ret = -ENOPROTOOPT;
590#ifdef CONFIG_NETDEVICES
591 struct net *net = sock_net(sk);
c91f6df2 592 char devname[IFNAMSIZ];
c91f6df2
BH		 593
594 if (sk->sk_bound_dev_if == 0) {
595 len = 0;
596 goto zero;
597 }
598
599 ret = -EINVAL;
600 if (len < IFNAMSIZ)
601 goto out;
602
5dbe7c17
NS		 603 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
604 if (ret)
c91f6df2 605 goto out;
c91f6df2
BH		 606
607 len = strlen(devname) + 1;
608
609 ret = -EFAULT;
610 if (copy_to_user(optval, devname, len))
611 goto out;
612
613zero:
614 ret = -EFAULT;
615 if (put_user(len, optlen))
616 goto out;
617
618 ret = 0;
619
620out:
621#endif
622
623 return ret;
624}
625
c0ef877b
PE		 626static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
627{
628 if (valbool)
629 sock_set_flag(sk, bit);
630 else
631 sock_reset_flag(sk, bit);
632}
633
f60e5990 634bool sk_mc_loop(struct sock *sk)
635{
636 if (dev_recursion_level())
637 return false;
638 if (!sk)
639 return true;
640 switch (sk->sk_family) {
641 case AF_INET:
642 return inet_sk(sk)->mc_loop;
643#if IS_ENABLED(CONFIG_IPV6)
644 case AF_INET6:
645 return inet6_sk(sk)->mc_loop;
646#endif
647 }
648 WARN_ON(1);
649 return true;
650}
651EXPORT_SYMBOL(sk_mc_loop);
652
1da177e4
LT		 653/*
654 * This is meant for all protocols to use and covers goings on
655 * at the socket level. Everything here is generic.
656 */
657
658int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 659 char __user *optval, unsigned int optlen)
1da177e4 660{
2a91525c 661 struct sock *sk = sock->sk;
1da177e4
LT		 662 int val;
663 int valbool;
664 struct linger ling;
665 int ret = 0;
4ec93edb 666
1da177e4
LT		 667 /*
668 * Options without arguments
669 */
670
4878809f 671 if (optname == SO_BINDTODEVICE)
c91f6df2 672 return sock_setbindtodevice(sk, optval, optlen);
4878809f 673
e71a4783
SH		 674 if (optlen < sizeof(int))
675 return -EINVAL;
4ec93edb 676
1da177e4
LT		 677 if (get_user(val, (int __user *)optval))
678 return -EFAULT;
4ec93edb 679
2a91525c 680 valbool = val ? 1 : 0;
1da177e4
LT		 681
682 lock_sock(sk);
683
2a91525c 684 switch (optname) {
e71a4783 685 case SO_DEBUG:
2a91525c 686 if (val && !capable(CAP_NET_ADMIN))
e71a4783 687 ret = -EACCES;
2a91525c 688 else
c0ef877b 689 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 690 break;
691 case SO_REUSEADDR:
4a17fd52 692 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 693 break;
055dc21a
TH		 694 case SO_REUSEPORT:
695 sk->sk_reuseport = valbool;
696 break;
e71a4783 697 case SO_TYPE:
49c794e9 698 case SO_PROTOCOL:
0d6038ee 699 case SO_DOMAIN:
e71a4783
SH		 700 case SO_ERROR:
701 ret = -ENOPROTOOPT;
702 break;
703 case SO_DONTROUTE:
c0ef877b 704 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 705 break;
706 case SO_BROADCAST:
707 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
708 break;
709 case SO_SNDBUF:
710 /* Don't error on this BSD doesn't and if you think
82981930
ED		 711 * about it this is right. Otherwise apps have to
712 * play 'guess the biggest size' games. RCVBUF/SNDBUF
713 * are treated in BSD as hints
714 */
715 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 716set_sndbuf:
e71a4783 717 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
b98b0bc8 718 sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF);
82981930 719 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 720 sk->sk_write_space(sk);
721 break;
1da177e4 722
e71a4783
SH		 723 case SO_SNDBUFFORCE:
724 if (!capable(CAP_NET_ADMIN)) {
725 ret = -EPERM;
726 break;
727 }
728 goto set_sndbuf;
b0573dea 729
e71a4783
SH		 730 case SO_RCVBUF:
731 /* Don't error on this BSD doesn't and if you think
82981930
ED		 732 * about it this is right. Otherwise apps have to
733 * play 'guess the biggest size' games. RCVBUF/SNDBUF
734 * are treated in BSD as hints
735 */
736 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 737set_rcvbuf:
e71a4783
SH		 738 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
739 /*
740 * We double it on the way in to account for
741 * "struct sk_buff" etc. overhead. Applications
742 * assume that the SO_RCVBUF setting they make will
743 * allow that much actual data to be received on that
744 * socket.
745 *
746 * Applications are unaware that "struct sk_buff" and
747 * other overheads allocate from the receive buffer
748 * during socket buffer allocation.
749 *
750 * And after considering the possible alternatives,
751 * returning the value we actually used in getsockopt
752 * is the most desirable behavior.
753 */
b98b0bc8 754 sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 755 break;
756
757 case SO_RCVBUFFORCE:
758 if (!capable(CAP_NET_ADMIN)) {
759 ret = -EPERM;
1da177e4 760 break;
e71a4783
SH		 761 }
762 goto set_rcvbuf;
1da177e4 763
e71a4783 764 case SO_KEEPALIVE:
1da177e4 765#ifdef CONFIG_INET
3e10986d
ED		 766 if (sk->sk_protocol == IPPROTO_TCP &&
767 sk->sk_type == SOCK_STREAM)
e71a4783 768 tcp_set_keepalive(sk, valbool);
1da177e4 769#endif
e71a4783
SH		 770 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
771 break;
772
773 case SO_OOBINLINE:
774 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
775 break;
776
777 case SO_NO_CHECK:
28448b80 778 sk->sk_no_check_tx = valbool;
e71a4783
SH		 779 break;
780
781 case SO_PRIORITY:
5e1fccc0
EB		 782 if ((val >= 0 && val <= 6) ||
783 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 784 sk->sk_priority = val;
785 else
786 ret = -EPERM;
787 break;
788
789 case SO_LINGER:
790 if (optlen < sizeof(ling)) {
791 ret = -EINVAL; /* 1003.1g */
1da177e4 792 break;
e71a4783 793 }
2a91525c 794 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 795 ret = -EFAULT;
1da177e4 796 break;
e71a4783
SH		 797 }
798 if (!ling.l_onoff)
799 sock_reset_flag(sk, SOCK_LINGER);
800 else {
1da177e4 801#if (BITS_PER_LONG == 32)
e71a4783
SH		 802 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
803 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 804 else
e71a4783
SH		 805#endif
806 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
807 sock_set_flag(sk, SOCK_LINGER);
808 }
809 break;
810
811 case SO_BSDCOMPAT:
812 sock_warn_obsolete_bsdism("setsockopt");
813 break;
814
815 case SO_PASSCRED:
816 if (valbool)
817 set_bit(SOCK_PASSCRED, &sock->flags);
818 else
819 clear_bit(SOCK_PASSCRED, &sock->flags);
820 break;
821
822 case SO_TIMESTAMP:
92f37fd2 823 case SO_TIMESTAMPNS:
e71a4783 824 if (valbool) {
92f37fd2
ED		 825 if (optname == SO_TIMESTAMP)
826 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
827 else
828 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 829 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 830 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 831 } else {
e71a4783 832 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 833 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
834 }
e71a4783
SH		 835 break;
836
20d49473
PO		 837 case SO_TIMESTAMPING:
838 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 839 ret = -EINVAL;
20d49473
PO		 840 break;
841 }
b245be1f 842
09c2d251 843 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765 844 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
ac5cc977
WC		 845 if (sk->sk_protocol == IPPROTO_TCP &&
846 sk->sk_type == SOCK_STREAM) {
6db8b963
SHY		 847 if ((1 << sk->sk_state) &
848 (TCPF_CLOSE | TCPF_LISTEN)) {
4ed2d765
WB		 849 ret = -EINVAL;
850 break;
851 }
852 sk->sk_tskey = tcp_sk(sk)->snd_una;
853 } else {
854 sk->sk_tskey = 0;
855 }
856 }
1c885808
FY		 857
858 if (val & SOF_TIMESTAMPING_OPT_STATS &&
859 !(val & SOF_TIMESTAMPING_OPT_TSONLY)) {
860 ret = -EINVAL;
861 break;
862 }
863
b9f40e21 864 sk->sk_tsflags = val;
20d49473
PO		 865 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
866 sock_enable_timestamp(sk,
867 SOCK_TIMESTAMPING_RX_SOFTWARE);
868 else
869 sock_disable_timestamp(sk,
08e29af3 870 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 871 break;
872
e71a4783
SH		 873 case SO_RCVLOWAT:
874 if (val < 0)
875 val = INT_MAX;
876 sk->sk_rcvlowat = val ? : 1;
877 break;
878
879 case SO_RCVTIMEO:
880 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
881 break;
882
883 case SO_SNDTIMEO:
884 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
885 break;
1da177e4 886
e71a4783
SH		 887 case SO_ATTACH_FILTER:
888 ret = -EINVAL;
889 if (optlen == sizeof(struct sock_fprog)) {
890 struct sock_fprog fprog;
1da177e4 891
e71a4783
SH		 892 ret = -EFAULT;
893 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 894 break;
e71a4783
SH		 895
896 ret = sk_attach_filter(&fprog, sk);
897 }
898 break;
899
89aa0758
AS		 900 case SO_ATTACH_BPF:
901 ret = -EINVAL;
902 if (optlen == sizeof(u32)) {
903 u32 ufd;
904
905 ret = -EFAULT;
906 if (copy_from_user(&ufd, optval, sizeof(ufd)))
907 break;
908
909 ret = sk_attach_bpf(ufd, sk);
910 }
911 break;
912
538950a1
CG		 913 case SO_ATTACH_REUSEPORT_CBPF:
914 ret = -EINVAL;
915 if (optlen == sizeof(struct sock_fprog)) {
916 struct sock_fprog fprog;
917
918 ret = -EFAULT;
919 if (copy_from_user(&fprog, optval, sizeof(fprog)))
920 break;
921
922 ret = sk_reuseport_attach_filter(&fprog, sk);
923 }
924 break;
925
926 case SO_ATTACH_REUSEPORT_EBPF:
927 ret = -EINVAL;
928 if (optlen == sizeof(u32)) {
929 u32 ufd;
930
931 ret = -EFAULT;
932 if (copy_from_user(&ufd, optval, sizeof(ufd)))
933 break;
934
935 ret = sk_reuseport_attach_bpf(ufd, sk);
936 }
937 break;
938
e71a4783 939 case SO_DETACH_FILTER:
55b33325 940 ret = sk_detach_filter(sk);
e71a4783 941 break;
1da177e4 942
d59577b6
VB		 943 case SO_LOCK_FILTER:
944 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
945 ret = -EPERM;
946 else
947 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
948 break;
949
e71a4783
SH		 950 case SO_PASSSEC:
951 if (valbool)
952 set_bit(SOCK_PASSSEC, &sock->flags);
953 else
954 clear_bit(SOCK_PASSSEC, &sock->flags);
955 break;
4a19ec58 956 case SO_MARK:
5e1fccc0 957 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 958 ret = -EPERM;
2a91525c 959 else
4a19ec58 960 sk->sk_mark = val;
4a19ec58 961 break;
877ce7c1 962
3b885787 963 case SO_RXQ_OVFL:
8083f0fc 964 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 965 break;
6e3e939f
JB		 966
967 case SO_WIFI_STATUS:
968 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
969 break;
970
ef64a54f
PE		 971 case SO_PEEK_OFF:
972 if (sock->ops->set_peek_off)
12663bfc 973 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 974 else
975 ret = -EOPNOTSUPP;
976 break;
3bdc0eba
BG		 977
978 case SO_NOFCS:
979 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
980 break;
981
7d4c04fc
KJ		 982 case SO_SELECT_ERR_QUEUE:
983 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
984 break;
985
e0d1095a 986#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 987 case SO_BUSY_POLL:
dafcc438
ET		 988 /* allow unprivileged users to decrease the value */
989 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
990 ret = -EPERM;
991 else {
992 if (val < 0)
993 ret = -EINVAL;
994 else
995 sk->sk_ll_usec = val;
996 }
997 break;
998#endif
62748f32
ED		 999
1000 case SO_MAX_PACING_RATE:
1001 sk->sk_max_pacing_rate = val;
1002 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
1003 sk->sk_max_pacing_rate);
1004 break;
1005
70da268b
ED		 1006 case SO_INCOMING_CPU:
1007 sk->sk_incoming_cpu = val;
1008 break;
1009
a87cb3e4
TH		 1010 case SO_CNX_ADVICE:
1011 if (val == 1)
1012 dst_negative_advice(sk);
1013 break;
e71a4783
SH		 1014 default:
1015 ret = -ENOPROTOOPT;
1016 break;
4ec93edb 1017 }
1da177e4
LT		 1018 release_sock(sk);
1019 return ret;
1020}
2a91525c 1021EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 1022
1023
8f09898b 1024static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1025 struct ucred *ucred)
3f551f94
EB		 1026{
1027 ucred->pid = pid_vnr(pid);
1028 ucred->uid = ucred->gid = -1;
1029 if (cred) {
1030 struct user_namespace *current_ns = current_user_ns();
1031
b2e4f544
EB		 1032 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1033 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 1034 }
1035}
1036
1da177e4
LT		 1037int sock_getsockopt(struct socket *sock, int level, int optname,
1038 char __user *optval, int __user *optlen)
1039{
1040 struct sock *sk = sock->sk;
4ec93edb 1041
e71a4783 1042 union {
4ec93edb
YH		 1043 int val;
1044 struct linger ling;
1da177e4
LT		 1045 struct timeval tm;
1046 } v;
4ec93edb 1047
4d0392be 1048 int lv = sizeof(int);
1da177e4 1049 int len;
4ec93edb 1050
e71a4783 1051 if (get_user(len, optlen))
4ec93edb 1052 return -EFAULT;
e71a4783 1053 if (len < 0)
1da177e4 1054 return -EINVAL;
4ec93edb 1055
50fee1de 1056 memset(&v, 0, sizeof(v));
df0bca04 1057
2a91525c 1058 switch (optname) {
e71a4783
SH		 1059 case SO_DEBUG:
1060 v.val = sock_flag(sk, SOCK_DBG);
1061 break;
1062
1063 case SO_DONTROUTE:
1064 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1065 break;
1066
1067 case SO_BROADCAST:
1b23a5df 1068 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1069 break;
1070
1071 case SO_SNDBUF:
1072 v.val = sk->sk_sndbuf;
1073 break;
1074
1075 case SO_RCVBUF:
1076 v.val = sk->sk_rcvbuf;
1077 break;
1078
1079 case SO_REUSEADDR:
1080 v.val = sk->sk_reuse;
1081 break;
1082
055dc21a
TH		 1083 case SO_REUSEPORT:
1084 v.val = sk->sk_reuseport;
1085 break;
1086
e71a4783 1087 case SO_KEEPALIVE:
1b23a5df 1088 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1089 break;
1090
1091 case SO_TYPE:
1092 v.val = sk->sk_type;
1093 break;
1094
49c794e9
JE		 1095 case SO_PROTOCOL:
1096 v.val = sk->sk_protocol;
1097 break;
1098
0d6038ee
JE		 1099 case SO_DOMAIN:
1100 v.val = sk->sk_family;
1101 break;
1102
e71a4783
SH		 1103 case SO_ERROR:
1104 v.val = -sock_error(sk);
2a91525c 1105 if (v.val == 0)
e71a4783
SH		 1106 v.val = xchg(&sk->sk_err_soft, 0);
1107 break;
1108
1109 case SO_OOBINLINE:
1b23a5df 1110 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1111 break;
1112
1113 case SO_NO_CHECK:
28448b80 1114 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1115 break;
1116
1117 case SO_PRIORITY:
1118 v.val = sk->sk_priority;
1119 break;
1120
1121 case SO_LINGER:
1122 lv = sizeof(v.ling);
1b23a5df 1123 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1124 v.ling.l_linger = sk->sk_lingertime / HZ;
1125 break;
1126
1127 case SO_BSDCOMPAT:
1128 sock_warn_obsolete_bsdism("getsockopt");
1129 break;
1130
1131 case SO_TIMESTAMP:
92f37fd2
ED		 1132 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1133 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1134 break;
1135
1136 case SO_TIMESTAMPNS:
1137 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1138 break;
1139
20d49473 1140 case SO_TIMESTAMPING:
b9f40e21 1141 v.val = sk->sk_tsflags;
20d49473
PO		 1142 break;
1143
e71a4783 1144 case SO_RCVTIMEO:
2a91525c 1145 lv = sizeof(struct timeval);
e71a4783
SH		 1146 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1147 v.tm.tv_sec = 0;
1148 v.tm.tv_usec = 0;
1149 } else {
1150 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1151 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1152 }
1153 break;
1154
1155 case SO_SNDTIMEO:
2a91525c 1156 lv = sizeof(struct timeval);
e71a4783
SH		 1157 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1158 v.tm.tv_sec = 0;
1159 v.tm.tv_usec = 0;
1160 } else {
1161 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1162 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1163 }
1164 break;
1da177e4 1165
e71a4783
SH		 1166 case SO_RCVLOWAT:
1167 v.val = sk->sk_rcvlowat;
1168 break;
1da177e4 1169
e71a4783 1170 case SO_SNDLOWAT:
2a91525c 1171 v.val = 1;
e71a4783 1172 break;
1da177e4 1173
e71a4783 1174 case SO_PASSCRED:
82981930 1175 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1176 break;
1da177e4 1177
e71a4783 1178 case SO_PEERCRED:
109f6e39
EB		 1179 {
1180 struct ucred peercred;
1181 if (len > sizeof(peercred))
1182 len = sizeof(peercred);
1183 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1184 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1185 return -EFAULT;
1186 goto lenout;
109f6e39 1187 }
1da177e4 1188
e71a4783
SH		 1189 case SO_PEERNAME:
1190 {
1191 char address[128];
1192
1193 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1194 return -ENOTCONN;
1195 if (lv < len)
1196 return -EINVAL;
1197 if (copy_to_user(optval, address, len))
1198 return -EFAULT;
1199 goto lenout;
1200 }
1da177e4 1201
e71a4783
SH		 1202 /* Dubious BSD thing... Probably nobody even uses it, but
1203 * the UNIX standard wants it for whatever reason... -DaveM
1204 */
1205 case SO_ACCEPTCONN:
1206 v.val = sk->sk_state == TCP_LISTEN;
1207 break;
1da177e4 1208
e71a4783 1209 case SO_PASSSEC:
82981930 1210 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1211 break;
877ce7c1 1212
e71a4783
SH		 1213 case SO_PEERSEC:
1214 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1215
4a19ec58
LAT		 1216 case SO_MARK:
1217 v.val = sk->sk_mark;
1218 break;
1219
3b885787 1220 case SO_RXQ_OVFL:
1b23a5df 1221 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1222 break;
1223
6e3e939f 1224 case SO_WIFI_STATUS:
1b23a5df 1225 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1226 break;
1227
ef64a54f
PE		 1228 case SO_PEEK_OFF:
1229 if (!sock->ops->set_peek_off)
1230 return -EOPNOTSUPP;
1231
1232 v.val = sk->sk_peek_off;
1233 break;
bc2f7996 1234 case SO_NOFCS:
1b23a5df 1235 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1236 break;
c91f6df2 1237
f7b86bfe 1238 case SO_BINDTODEVICE:
c91f6df2
BH		 1239 return sock_getbindtodevice(sk, optval, optlen, len);
1240
a8fc9277
PE		 1241 case SO_GET_FILTER:
1242 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1243 if (len < 0)
1244 return len;
1245
1246 goto lenout;
c91f6df2 1247
d59577b6
VB		 1248 case SO_LOCK_FILTER:
1249 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1250 break;
1251
ea02f941
MS		 1252 case SO_BPF_EXTENSIONS:
1253 v.val = bpf_tell_extensions();
1254 break;
1255
7d4c04fc
KJ		 1256 case SO_SELECT_ERR_QUEUE:
1257 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1258 break;
1259
e0d1095a 1260#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1261 case SO_BUSY_POLL:
dafcc438
ET		 1262 v.val = sk->sk_ll_usec;
1263 break;
1264#endif
1265
62748f32
ED		 1266 case SO_MAX_PACING_RATE:
1267 v.val = sk->sk_max_pacing_rate;
1268 break;
1269
2c8c56e1
ED		 1270 case SO_INCOMING_CPU:
1271 v.val = sk->sk_incoming_cpu;
1272 break;
1273
e71a4783 1274 default:
443b5991
YH		 1275 /* We implement the SO_SNDLOWAT etc to not be settable
1276 * (1003.1g 7).
1277 */
e71a4783 1278 return -ENOPROTOOPT;
1da177e4 1279 }
e71a4783 1280
1da177e4
LT		 1281 if (len > lv)
1282 len = lv;
1283 if (copy_to_user(optval, &v, len))
1284 return -EFAULT;
1285lenout:
4ec93edb
YH		 1286 if (put_user(len, optlen))
1287 return -EFAULT;
1288 return 0;
1da177e4
LT		 1289}
1290
a5b5bb9a
IM		 1291/*
1292 * Initialize an sk_lock.
1293 *
1294 * (We also register the sk_lock with the lock validator.)
1295 */
b6f99a21 1296static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1297{
ed07536e
PZ		 1298 sock_lock_init_class_and_name(sk,
1299 af_family_slock_key_strings[sk->sk_family],
1300 af_family_slock_keys + sk->sk_family,
1301 af_family_key_strings[sk->sk_family],
1302 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1303}
1304
4dc6dc71
ED		 1305/*
1306 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1307 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1308 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1309 */
f1a6c4da
PE		 1310static void sock_copy(struct sock *nsk, const struct sock *osk)
1311{
1312#ifdef CONFIG_SECURITY_NETWORK
1313 void *sptr = nsk->sk_security;
1314#endif
68835aba
ED		 1315 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1316
1317 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1318 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1319
f1a6c4da
PE		 1320#ifdef CONFIG_SECURITY_NETWORK
1321 nsk->sk_security = sptr;
1322 security_sk_clone(osk, nsk);
1323#endif
1324}
1325
2e4afe7b
PE		 1326static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1327 int family)
c308c1b2
PE		 1328{
1329 struct sock *sk;
1330 struct kmem_cache *slab;
1331
1332 slab = prot->slab;
e912b114
ED		 1333 if (slab != NULL) {
1334 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1335 if (!sk)
1336 return sk;
ba2489b0
ED		 1337 if (priority & __GFP_ZERO)
1338 sk_prot_clear_nulls(sk, prot->obj_size);
fcbdf09d 1339 } else
c308c1b2
PE		 1340 sk = kmalloc(prot->obj_size, priority);
1341
2e4afe7b 1342 if (sk != NULL) {
a98b65a3
VN		 1343 kmemcheck_annotate_bitfield(sk, flags);
1344
2e4afe7b
PE		 1345 if (security_sk_alloc(sk, family, priority))
1346 goto out_free;
1347
1348 if (!try_module_get(prot->owner))
1349 goto out_free_sec;
e022f0b4 1350 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1351 }
1352
c308c1b2 1353 return sk;
2e4afe7b
PE		 1354
1355out_free_sec:
1356 security_sk_free(sk);
1357out_free:
1358 if (slab != NULL)
1359 kmem_cache_free(slab, sk);
1360 else
1361 kfree(sk);
1362 return NULL;
c308c1b2
PE		 1363}
1364
1365static void sk_prot_free(struct proto *prot, struct sock *sk)
1366{
1367 struct kmem_cache *slab;
2e4afe7b 1368 struct module *owner;
c308c1b2 1369
2e4afe7b 1370 owner = prot->owner;
c308c1b2 1371 slab = prot->slab;
2e4afe7b 1372
bd1060a1 1373 cgroup_sk_free(&sk->sk_cgrp_data);
2d758073 1374 mem_cgroup_sk_free(sk);
2e4afe7b 1375 security_sk_free(sk);
c308c1b2
PE		 1376 if (slab != NULL)
1377 kmem_cache_free(slab, sk);
1378 else
1379 kfree(sk);
2e4afe7b 1380 module_put(owner);
c308c1b2
PE		 1381}
1382
1da177e4
LT		 1383/**
1384 * sk_alloc - All socket objects are allocated here
c4ea43c5 1385 * @net: the applicable net namespace
4dc3b16b
PP		 1386 * @family: protocol family
1387 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1388 * @prot: struct proto associated with this new sock instance
11aa9c28 1389 * @kern: is this to be a kernel socket?
1da177e4 1390 */
1b8d7ae4 1391struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
11aa9c28 1392 struct proto *prot, int kern)
1da177e4 1393{
c308c1b2 1394 struct sock *sk;
1da177e4 1395
154adbc8 1396 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1397 if (sk) {
154adbc8
PE		 1398 sk->sk_family = family;
1399 /*
1400 * See comment in struct sock definition to understand
1401 * why we need sk_prot_creator -acme
1402 */
1403 sk->sk_prot = sk->sk_prot_creator = prot;
1404 sock_lock_init(sk);
26abe143
EB		 1405 sk->sk_net_refcnt = kern ? 0 : 1;
1406 if (likely(sk->sk_net_refcnt))
1407 get_net(net);
1408 sock_net_set(sk, net);
d66ee058 1409 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1410
2d758073 1411 mem_cgroup_sk_alloc(sk);
d979a39d 1412 cgroup_sk_alloc(&sk->sk_cgrp_data);
2a56a1fe
TH		 1413 sock_update_classid(&sk->sk_cgrp_data);
1414 sock_update_netprioidx(&sk->sk_cgrp_data);
1da177e4 1415 }
a79af59e 1416
2e4afe7b 1417 return sk;
1da177e4 1418}
2a91525c 1419EXPORT_SYMBOL(sk_alloc);
1da177e4 1420
a4298e45
ED		 1421/* Sockets having SOCK_RCU_FREE will call this function after one RCU
1422 * grace period. This is the case for UDP sockets and TCP listeners.
1423 */
1424static void __sk_destruct(struct rcu_head *head)
1da177e4 1425{
a4298e45 1426 struct sock *sk = container_of(head, struct sock, sk_rcu);
1da177e4 1427 struct sk_filter *filter;
1da177e4
LT		 1428
1429 if (sk->sk_destruct)
1430 sk->sk_destruct(sk);
1431
a898def2
PM		 1432 filter = rcu_dereference_check(sk->sk_filter,
1433 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1434 if (filter) {
309dd5fc 1435 sk_filter_uncharge(sk, filter);
a9b3cd7f 1436 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4 1437 }
538950a1
CG		 1438 if (rcu_access_pointer(sk->sk_reuseport_cb))
1439 reuseport_detach_sock(sk);
1da177e4 1440
08e29af3 1441 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1442
1443 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1444 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1445 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1446
109f6e39
EB		 1447 if (sk->sk_peer_cred)
1448 put_cred(sk->sk_peer_cred);
1449 put_pid(sk->sk_peer_pid);
26abe143
EB		 1450 if (likely(sk->sk_net_refcnt))
1451 put_net(sock_net(sk));
c308c1b2 1452 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1453}
2b85a34e 1454
a4298e45
ED		 1455void sk_destruct(struct sock *sk)
1456{
1457 if (sock_flag(sk, SOCK_RCU_FREE))
1458 call_rcu(&sk->sk_rcu, __sk_destruct);
1459 else
1460 __sk_destruct(&sk->sk_rcu);
1461}
1462
eb4cb008
CG		 1463static void __sk_free(struct sock *sk)
1464{
b922622e 1465 if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt))
eb4cb008
CG		 1466 sock_diag_broadcast_destroy(sk);
1467 else
1468 sk_destruct(sk);
1469}
1470
2b85a34e
ED		 1471void sk_free(struct sock *sk)
1472{
1473 /*
25985edc 1474 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1475 * some packets are still in some tx queue.
1476 * If not null, sock_wfree() will call __sk_free(sk) later
1477 */
1478 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1479 __sk_free(sk);
1480}
2a91525c 1481EXPORT_SYMBOL(sk_free);
1da177e4 1482
e56c57d0
ED		 1483/**
1484 * sk_clone_lock - clone a socket, and lock its clone
1485 * @sk: the socket to clone
1486 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1487 *
1488 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1489 */
1490struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1491{
8fd1d178 1492 struct sock *newsk;
278571ba 1493 bool is_charged = true;
87d11ceb 1494
8fd1d178 1495 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1496 if (newsk != NULL) {
1497 struct sk_filter *filter;
1498
892c141e 1499 sock_copy(newsk, sk);
87d11ceb
ACM		 1500
1501 /* SANITY */
8a681736
SV		 1502 if (likely(newsk->sk_net_refcnt))
1503 get_net(sock_net(newsk));
87d11ceb
ACM		 1504 sk_node_init(&newsk->sk_node);
1505 sock_lock_init(newsk);
1506 bh_lock_sock(newsk);
fa438ccf 1507 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1508 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1509
1510 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1511 /*
1512 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1513 */
1514 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1515 atomic_set(&newsk->sk_omem_alloc, 0);
1516 skb_queue_head_init(&newsk->sk_receive_queue);
1517 skb_queue_head_init(&newsk->sk_write_queue);
1518
87d11ceb 1519 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1520 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1521 af_callback_keys + newsk->sk_family,
1522 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1523
1524 newsk->sk_dst_cache = NULL;
1525 newsk->sk_wmem_queued = 0;
1526 newsk->sk_forward_alloc = 0;
9caad864 1527 atomic_set(&newsk->sk_drops, 0);
87d11ceb 1528 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1529 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1530
1531 sock_reset_flag(newsk, SOCK_DONE);
1532 skb_queue_head_init(&newsk->sk_error_queue);
1533
0d7da9dd 1534 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb 1535 if (filter != NULL)
278571ba
AS		 1536 /* though it's an empty new sock, the charging may fail
1537 * if sysctl_optmem_max was changed between creation of
1538 * original socket and cloning
1539 */
1540 is_charged = sk_filter_charge(newsk, filter);
87d11ceb 1541
d188ba86 1542 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
87d11ceb
ACM		 1543 /* It is still raw copy of parent, so invalidate
1544 * destructor and make plain sk_free() */
1545 newsk->sk_destruct = NULL;
b0691c8e 1546 bh_unlock_sock(newsk);
87d11ceb
ACM		 1547 sk_free(newsk);
1548 newsk = NULL;
1549 goto out;
1550 }
fa463497 1551 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
87d11ceb
ACM		 1552
1553 newsk->sk_err = 0;
e551c32d 1554 newsk->sk_err_soft = 0;
87d11ceb 1555 newsk->sk_priority = 0;
2c8c56e1 1556 newsk->sk_incoming_cpu = raw_smp_processor_id();
33cf7c90 1557 atomic64_set(&newsk->sk_cookie, 0);
d979a39d 1558
2d758073 1559 mem_cgroup_sk_alloc(newsk);
d979a39d
JW		 1560 cgroup_sk_alloc(&newsk->sk_cgrp_data);
1561
4dc6dc71
ED		 1562 /*
1563 * Before updating sk_refcnt, we must commit prior changes to memory
1564 * (Documentation/RCU/rculist_nulls.txt for details)
1565 */
1566 smp_wmb();
87d11ceb
ACM		 1567 atomic_set(&newsk->sk_refcnt, 2);
1568
1569 /*
1570 * Increment the counter in the same struct proto as the master
1571 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1572 * is the same as sk->sk_prot->socks, as this field was copied
1573 * with memcpy).
1574 *
1575 * This _changes_ the previous behaviour, where
1576 * tcp_create_openreq_child always was incrementing the
1577 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1578 * to be taken into account in all callers. -acme
1579 */
1580 sk_refcnt_debug_inc(newsk);
972692e0 1581 sk_set_socket(newsk, NULL);
43815482 1582 newsk->sk_wq = NULL;
87d11ceb
ACM		 1583
1584 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1585 sk_sockets_allocated_inc(newsk);
704da560 1586
080a270f
HFS		 1587 if (sock_needs_netstamp(sk) &&
1588 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1589 net_enable_timestamp();
87d11ceb
ACM		 1590 }
1591out:
1592 return newsk;
1593}
e56c57d0 1594EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1595
9958089a
AK		 1596void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1597{
d6a4e26a
ED		 1598 u32 max_segs = 1;
1599
6bd4f355 1600 sk_dst_set(sk, dst);
9958089a
AK		 1601 sk->sk_route_caps = dst->dev->features;
1602 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1603 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1604 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1605 if (sk_can_gso(sk)) {
82cc1a7a 1606 if (dst->header_len) {
9958089a 1607 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1608 } else {
9958089a 1609 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1610 sk->sk_gso_max_size = dst->dev->gso_max_size;
d6a4e26a 1611 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
82cc1a7a 1612 }
9958089a 1613 }
d6a4e26a 1614 sk->sk_gso_max_segs = max_segs;
9958089a
AK		 1615}
1616EXPORT_SYMBOL_GPL(sk_setup_caps);
1617
1da177e4
LT		 1618/*
1619 * Simple resource managers for sockets.
1620 */
1621
1622
4ec93edb
YH		 1623/*
1624 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1625 */
1626void sock_wfree(struct sk_buff *skb)
1627{
1628 struct sock *sk = skb->sk;
d99927f4 1629 unsigned int len = skb->truesize;
1da177e4 1630
d99927f4
ED		 1631 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1632 /*
1633 * Keep a reference on sk_wmem_alloc, this will be released
1634 * after sk_write_space() call
1635 */
1636 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1637 sk->sk_write_space(sk);
d99927f4
ED		 1638 len = 1;
1639 }
2b85a34e 1640 /*
d99927f4
ED		 1641 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1642 * could not do because of in-flight packets
2b85a34e 1643 */
d99927f4 1644 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1645 __sk_free(sk);
1da177e4 1646}
2a91525c 1647EXPORT_SYMBOL(sock_wfree);
1da177e4 1648
1d2077ac
ED		 1649/* This variant of sock_wfree() is used by TCP,
1650 * since it sets SOCK_USE_WRITE_QUEUE.
1651 */
1652void __sock_wfree(struct sk_buff *skb)
1653{
1654 struct sock *sk = skb->sk;
1655
1656 if (atomic_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
1657 __sk_free(sk);
1658}
1659
9e17f8a4
ED		 1660void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1661{
1662 skb_orphan(skb);
1663 skb->sk = sk;
1664#ifdef CONFIG_INET
1665 if (unlikely(!sk_fullsock(sk))) {
1666 skb->destructor = sock_edemux;
1667 sock_hold(sk);
1668 return;
1669 }
1670#endif
1671 skb->destructor = sock_wfree;
1672 skb_set_hash_from_sk(skb, sk);
1673 /*
1674 * We used to take a refcount on sk, but following operation
1675 * is enough to guarantee sk_free() wont free this sock until
1676 * all in-flight packets are completed
1677 */
1678 atomic_add(skb->truesize, &sk->sk_wmem_alloc);
1679}
1680EXPORT_SYMBOL(skb_set_owner_w);
1681
1d2077ac
ED		 1682/* This helper is used by netem, as it can hold packets in its
1683 * delay queue. We want to allow the owner socket to send more
1684 * packets, as if they were already TX completed by a typical driver.
1685 * But we also want to keep skb->sk set because some packet schedulers
1686 * rely on it (sch_fq for example). So we set skb->truesize to a small
1687 * amount (1) and decrease sk_wmem_alloc accordingly.
1688 */
f2f872f9
ED		 1689void skb_orphan_partial(struct sk_buff *skb)
1690{
1d2077ac
ED		 1691 /* If this skb is a TCP pure ACK or already went here,
1692 * we have nothing to do. 2 is already a very small truesize.
1693 */
1694 if (skb->truesize <= 2)
1695 return;
1696
f2f872f9
ED		 1697 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1698 * so we do not completely orphan skb, but transfert all
1699 * accounted bytes but one, to avoid unexpected reorders.
1700 */
1701 if (skb->destructor == sock_wfree
1702#ifdef CONFIG_INET
1703 || skb->destructor == tcp_wfree
1704#endif
1705 ) {
1706 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1707 skb->truesize = 1;
1708 } else {
1709 skb_orphan(skb);
1710 }
1711}
1712EXPORT_SYMBOL(skb_orphan_partial);
1713
4ec93edb
YH		 1714/*
1715 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1716 */
1717void sock_rfree(struct sk_buff *skb)
1718{
1719 struct sock *sk = skb->sk;
d361fd59 1720 unsigned int len = skb->truesize;
1da177e4 1721
d361fd59
ED		 1722 atomic_sub(len, &sk->sk_rmem_alloc);
1723 sk_mem_uncharge(sk, len);
1da177e4 1724}
2a91525c 1725EXPORT_SYMBOL(sock_rfree);
1da177e4 1726
7768eed8
OH		 1727/*
1728 * Buffer destructor for skbs that are not used directly in read or write
1729 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1730 */
62bccb8c
AD		 1731void sock_efree(struct sk_buff *skb)
1732{
1733 sock_put(skb->sk);
1734}
1735EXPORT_SYMBOL(sock_efree);
1736
976d0201 1737kuid_t sock_i_uid(struct sock *sk)
1da177e4 1738{
976d0201 1739 kuid_t uid;
1da177e4 1740
f064af1e 1741 read_lock_bh(&sk->sk_callback_lock);
976d0201 1742 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1743 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1744 return uid;
1745}
2a91525c 1746EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1747
1748unsigned long sock_i_ino(struct sock *sk)
1749{
1750 unsigned long ino;
1751
f064af1e 1752 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1753 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1754 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1755 return ino;
1756}
2a91525c 1757EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1758
1759/*
1760 * Allocate a skb from the socket's send buffer.
1761 */
86a76caf 1762struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1763 gfp_t priority)
1da177e4
LT		 1764{
1765 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1766 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1767 if (skb) {
1768 skb_set_owner_w(skb, sk);
1769 return skb;
1770 }
1771 }
1772 return NULL;
1773}
2a91525c 1774EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1775
4ec93edb 1776/*
1da177e4 1777 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1778 */
dd0fc66f 1779void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1780{
95c96174 1781 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1782 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1783 void *mem;
1784 /* First do the add, to avoid the race if kmalloc
4ec93edb 1785 * might sleep.
1da177e4
LT		 1786 */
1787 atomic_add(size, &sk->sk_omem_alloc);
1788 mem = kmalloc(size, priority);
1789 if (mem)
1790 return mem;
1791 atomic_sub(size, &sk->sk_omem_alloc);
1792 }
1793 return NULL;
1794}
2a91525c 1795EXPORT_SYMBOL(sock_kmalloc);
1da177e4 1796
79e88659
DB		 1797/* Free an option memory block. Note, we actually want the inline
1798 * here as this allows gcc to detect the nullify and fold away the
1799 * condition entirely.
1da177e4 1800 */
79e88659
DB		 1801static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1802 const bool nullify)
1da177e4 1803{
e53da5fb
DM		 1804 if (WARN_ON_ONCE(!mem))
1805 return;
79e88659
DB		 1806 if (nullify)
1807 kzfree(mem);
1808 else
1809 kfree(mem);
1da177e4
LT		 1810 atomic_sub(size, &sk->sk_omem_alloc);
1811}
79e88659
DB		 1812
1813void sock_kfree_s(struct sock *sk, void *mem, int size)
1814{
1815 __sock_kfree_s(sk, mem, size, false);
1816}
2a91525c 1817EXPORT_SYMBOL(sock_kfree_s);
1da177e4 1818
79e88659
DB		 1819void sock_kzfree_s(struct sock *sk, void *mem, int size)
1820{
1821 __sock_kfree_s(sk, mem, size, true);
1822}
1823EXPORT_SYMBOL(sock_kzfree_s);
1824
1da177e4
LT		 1825/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1826 I think, these locks should be removed for datagram sockets.
1827 */
2a91525c 1828static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1829{
1830 DEFINE_WAIT(wait);
1831
9cd3e072 1832 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1da177e4
LT		 1833 for (;;) {
1834 if (!timeo)
1835 break;
1836 if (signal_pending(current))
1837 break;
1838 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1839 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1840 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1841 break;
1842 if (sk->sk_shutdown & SEND_SHUTDOWN)
1843 break;
1844 if (sk->sk_err)
1845 break;
1846 timeo = schedule_timeout(timeo);
1847 }
aa395145 1848 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1849 return timeo;
1850}
1851
1852
1853/*
1854 * Generic send/receive buffer handlers
1855 */
1856
4cc7f68d
HX		 1857struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1858 unsigned long data_len, int noblock,
28d64271 1859 int *errcode, int max_page_order)
1da177e4 1860{
2e4e4410 1861 struct sk_buff *skb;
1da177e4
LT		 1862 long timeo;
1863 int err;
1864
1da177e4 1865 timeo = sock_sndtimeo(sk, noblock);
2e4e4410 1866 for (;;) {
1da177e4
LT		 1867 err = sock_error(sk);
1868 if (err != 0)
1869 goto failure;
1870
1871 err = -EPIPE;
1872 if (sk->sk_shutdown & SEND_SHUTDOWN)
1873 goto failure;
1874
2e4e4410
ED		 1875 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
1876 break;
28d64271 1877
9cd3e072 1878 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2e4e4410
ED		 1879 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1880 err = -EAGAIN;
1881 if (!timeo)
1da177e4 1882 goto failure;
2e4e4410
ED		 1883 if (signal_pending(current))
1884 goto interrupted;
1885 timeo = sock_wait_for_wmem(sk, timeo);
1da177e4 1886 }
2e4e4410
ED		 1887 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
1888 errcode, sk->sk_allocation);
1889 if (skb)
1890 skb_set_owner_w(skb, sk);
1da177e4
LT		 1891 return skb;
1892
1893interrupted:
1894 err = sock_intr_errno(timeo);
1895failure:
1896 *errcode = err;
1897 return NULL;
1898}
4cc7f68d 1899EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1900
4ec93edb 1901struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1902 int noblock, int *errcode)
1903{
28d64271 1904 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1905}
2a91525c 1906EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1907
39771b12
WB		 1908int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
1909 struct sockcm_cookie *sockc)
1910{
3dd17e63
SHY		 1911 u32 tsflags;
1912
39771b12
WB		 1913 switch (cmsg->cmsg_type) {
1914 case SO_MARK:
1915 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1916 return -EPERM;
1917 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
1918 return -EINVAL;
1919 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
1920 break;
3dd17e63
SHY		 1921 case SO_TIMESTAMPING:
1922 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
1923 return -EINVAL;
1924
1925 tsflags = *(u32 *)CMSG_DATA(cmsg);
1926 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
1927 return -EINVAL;
1928
1929 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
1930 sockc->tsflags |= tsflags;
1931 break;
779f1ede
SHY		 1932 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
1933 case SCM_RIGHTS:
1934 case SCM_CREDENTIALS:
1935 break;
39771b12
WB		 1936 default:
1937 return -EINVAL;
1938 }
1939 return 0;
1940}
1941EXPORT_SYMBOL(__sock_cmsg_send);
1942
f28ea365
EJ		 1943int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
1944 struct sockcm_cookie *sockc)
1945{
1946 struct cmsghdr *cmsg;
39771b12 1947 int ret;
f28ea365
EJ		 1948
1949 for_each_cmsghdr(cmsg, msg) {
1950 if (!CMSG_OK(msg, cmsg))
1951 return -EINVAL;
1952 if (cmsg->cmsg_level != SOL_SOCKET)
1953 continue;
39771b12
WB		 1954 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
1955 if (ret)
1956 return ret;
f28ea365
EJ		 1957 }
1958 return 0;
1959}
1960EXPORT_SYMBOL(sock_cmsg_send);
1961
5640f768
ED		 1962/* On 32bit arches, an skb frag is limited to 2^15 */
1963#define SKB_FRAG_PAGE_ORDER get_order(32768)
1964
400dfd3a
ED		 1965/**
1966 * skb_page_frag_refill - check that a page_frag contains enough room
1967 * @sz: minimum size of the fragment we want to get
1968 * @pfrag: pointer to page_frag
82d5e2b8 1969 * @gfp: priority for memory allocation
400dfd3a
ED		 1970 *
1971 * Note: While this allocator tries to use high order pages, there is
1972 * no guarantee that allocations succeed. Therefore, @sz MUST be
1973 * less or equal than PAGE_SIZE.
1974 */
d9b2938a 1975bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 1976{
5640f768 1977 if (pfrag->page) {
fe896d18 1978 if (page_ref_count(pfrag->page) == 1) {
5640f768
ED		 1979 pfrag->offset = 0;
1980 return true;
1981 }
400dfd3a 1982 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1983 return true;
1984 put_page(pfrag->page);
1985 }
1986
d9b2938a
ED		 1987 pfrag->offset = 0;
1988 if (SKB_FRAG_PAGE_ORDER) {
d0164adc
MG		 1989 /* Avoid direct reclaim but allow kswapd to wake */
1990 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
1991 __GFP_COMP | __GFP_NOWARN |
1992 __GFP_NORETRY,
d9b2938a 1993 SKB_FRAG_PAGE_ORDER);
5640f768 1994 if (likely(pfrag->page)) {
d9b2938a 1995 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 1996 return true;
1997 }
d9b2938a
ED		 1998 }
1999 pfrag->page = alloc_page(gfp);
2000 if (likely(pfrag->page)) {
2001 pfrag->size = PAGE_SIZE;
2002 return true;
2003 }
400dfd3a
ED		 2004 return false;
2005}
2006EXPORT_SYMBOL(skb_page_frag_refill);
2007
2008bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2009{
2010 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2011 return true;
2012
5640f768
ED		 2013 sk_enter_memory_pressure(sk);
2014 sk_stream_moderate_sndbuf(sk);
2015 return false;
2016}
2017EXPORT_SYMBOL(sk_page_frag_refill);
2018
1da177e4 2019static void __lock_sock(struct sock *sk)
f39234d6
NK		 2020 __releases(&sk->sk_lock.slock)
2021 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 2022{
2023 DEFINE_WAIT(wait);
2024
e71a4783 2025 for (;;) {
1da177e4
LT		 2026 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2027 TASK_UNINTERRUPTIBLE);
2028 spin_unlock_bh(&sk->sk_lock.slock);
2029 schedule();
2030 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 2031 if (!sock_owned_by_user(sk))
1da177e4
LT		 2032 break;
2033 }
2034 finish_wait(&sk->sk_lock.wq, &wait);
2035}
2036
2037static void __release_sock(struct sock *sk)
f39234d6
NK		 2038 __releases(&sk->sk_lock.slock)
2039 __acquires(&sk->sk_lock.slock)
1da177e4 2040{
5413d1ba 2041 struct sk_buff *skb, *next;
1da177e4 2042
5413d1ba 2043 while ((skb = sk->sk_backlog.head) != NULL) {
1da177e4 2044 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1da177e4 2045
5413d1ba 2046 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4 2047
5413d1ba
ED		 2048 do {
2049 next = skb->next;
e4cbb02a 2050 prefetch(next);
7fee226a 2051 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 2052 skb->next = NULL;
c57943a1 2053 sk_backlog_rcv(sk, skb);
1da177e4 2054
5413d1ba 2055 cond_resched();
1da177e4
LT		 2056
2057 skb = next;
2058 } while (skb != NULL);
2059
5413d1ba
ED		 2060 spin_lock_bh(&sk->sk_lock.slock);
2061 }
8eae939f
ZY		 2062
2063 /*
2064 * Doing the zeroing here guarantee we can not loop forever
2065 * while a wild producer attempts to flood us.
2066 */
2067 sk->sk_backlog.len = 0;
1da177e4
LT		 2068}
2069
d41a69f1
ED		 2070void __sk_flush_backlog(struct sock *sk)
2071{
2072 spin_lock_bh(&sk->sk_lock.slock);
2073 __release_sock(sk);
2074 spin_unlock_bh(&sk->sk_lock.slock);
2075}
2076
1da177e4
LT		 2077/**
2078 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 2079 * @sk: sock to wait on
2080 * @timeo: for how long
dfbafc99 2081 * @skb: last skb seen on sk_receive_queue
1da177e4
LT		 2082 *
2083 * Now socket state including sk->sk_err is changed only under lock,
2084 * hence we may omit checks after joining wait queue.
2085 * We check receive queue before schedule() only as optimization;
2086 * it is very likely that release_sock() added new data.
2087 */
dfbafc99 2088int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
1da177e4 2089{
d9dc8b0f 2090 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1da177e4 2091 int rc;
1da177e4 2092
d9dc8b0f 2093 add_wait_queue(sk_sleep(sk), &wait);
9cd3e072 2094 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
d9dc8b0f 2095 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
9cd3e072 2096 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
d9dc8b0f 2097 remove_wait_queue(sk_sleep(sk), &wait);
1da177e4
LT		 2098 return rc;
2099}
1da177e4
LT		 2100EXPORT_SYMBOL(sk_wait_data);
2101
3ab224be 2102/**
f8c3bf00 2103 * __sk_mem_raise_allocated - increase memory_allocated
3ab224be
HA		 2104 * @sk: socket
2105 * @size: memory size to allocate
f8c3bf00 2106 * @amt: pages to allocate
3ab224be
HA		 2107 * @kind: allocation type
2108 *
f8c3bf00 2109 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc
3ab224be 2110 */
f8c3bf00 2111int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
3ab224be
HA		 2112{
2113 struct proto *prot = sk->sk_prot;
f8c3bf00 2114 long allocated = sk_memory_allocated_add(sk, amt);
e805605c 2115
baac50bb
JW		 2116 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2117 !mem_cgroup_charge_skmem(sk->sk_memcg, amt))
e805605c 2118 goto suppress_allocation;
3ab224be
HA		 2119
2120 /* Under limit. */
e805605c 2121 if (allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2122 sk_leave_memory_pressure(sk);
3ab224be
HA		 2123 return 1;
2124 }
2125
e805605c
JW		 2126 /* Under pressure. */
2127 if (allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2128 sk_enter_memory_pressure(sk);
3ab224be 2129
e805605c
JW		 2130 /* Over hard limit. */
2131 if (allocated > sk_prot_mem_limits(sk, 2))
3ab224be
HA		 2132 goto suppress_allocation;
2133
2134 /* guarantee minimum buffer size under pressure */
2135 if (kind == SK_MEM_RECV) {
2136 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2137 return 1;
180d8cd9 2138
3ab224be
HA		 2139 } else { /* SK_MEM_SEND */
2140 if (sk->sk_type == SOCK_STREAM) {
2141 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2142 return 1;
2143 } else if (atomic_read(&sk->sk_wmem_alloc) <
2144 prot->sysctl_wmem[0])
2145 return 1;
2146 }
2147
180d8cd9 2148 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2149 int alloc;
2150
180d8cd9 2151 if (!sk_under_memory_pressure(sk))
1748376b 2152 return 1;
180d8cd9
GC		 2153 alloc = sk_sockets_allocated_read_positive(sk);
2154 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2155 sk_mem_pages(sk->sk_wmem_queued +
2156 atomic_read(&sk->sk_rmem_alloc) +
2157 sk->sk_forward_alloc))
2158 return 1;
2159 }
2160
2161suppress_allocation:
2162
2163 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2164 sk_stream_moderate_sndbuf(sk);
2165
2166 /* Fail only if socket is _under_ its sndbuf.
2167 * In this case we cannot block, so that we have to fail.
2168 */
2169 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2170 return 1;
2171 }
2172
3847ce32
SM		 2173 trace_sock_exceed_buf_limit(sk, prot, allocated);
2174
0e90b31f 2175 sk_memory_allocated_sub(sk, amt);
180d8cd9 2176
baac50bb
JW		 2177 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2178 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
e805605c 2179
3ab224be
HA		 2180 return 0;
2181}
f8c3bf00
PA		 2182EXPORT_SYMBOL(__sk_mem_raise_allocated);
2183
2184/**
2185 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2186 * @sk: socket
2187 * @size: memory size to allocate
2188 * @kind: allocation type
2189 *
2190 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2191 * rmem allocation. This function assumes that protocols which have
2192 * memory_pressure use sk_wmem_queued as write buffer accounting.
2193 */
2194int __sk_mem_schedule(struct sock *sk, int size, int kind)
2195{
2196 int ret, amt = sk_mem_pages(size);
2197
2198 sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT;
2199 ret = __sk_mem_raise_allocated(sk, size, amt, kind);
2200 if (!ret)
2201 sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT;
2202 return ret;
2203}
3ab224be
HA		 2204EXPORT_SYMBOL(__sk_mem_schedule);
2205
2206/**
f8c3bf00 2207 * __sk_mem_reduce_allocated - reclaim memory_allocated
3ab224be 2208 * @sk: socket
f8c3bf00
PA		 2209 * @amount: number of quanta
2210 *
2211 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
3ab224be 2212 */
f8c3bf00 2213void __sk_mem_reduce_allocated(struct sock *sk, int amount)
3ab224be 2214{
1a24e04e 2215 sk_memory_allocated_sub(sk, amount);
3ab224be 2216
baac50bb
JW		 2217 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2218 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
e805605c 2219
180d8cd9
GC		 2220 if (sk_under_memory_pressure(sk) &&
2221 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2222 sk_leave_memory_pressure(sk);
3ab224be 2223}
f8c3bf00
PA		 2224EXPORT_SYMBOL(__sk_mem_reduce_allocated);
2225
2226/**
2227 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
2228 * @sk: socket
2229 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
2230 */
2231void __sk_mem_reclaim(struct sock *sk, int amount)
2232{
2233 amount >>= SK_MEM_QUANTUM_SHIFT;
2234 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
2235 __sk_mem_reduce_allocated(sk, amount);
2236}
3ab224be
HA		 2237EXPORT_SYMBOL(__sk_mem_reclaim);
2238
627d2d6b 2239int sk_set_peek_off(struct sock *sk, int val)
2240{
2241 if (val < 0)
2242 return -EINVAL;
2243
2244 sk->sk_peek_off = val;
2245 return 0;
2246}
2247EXPORT_SYMBOL_GPL(sk_set_peek_off);
3ab224be 2248
1da177e4
LT		 2249/*
2250 * Set of default routines for initialising struct proto_ops when
2251 * the protocol does not support a particular function. In certain
2252 * cases where it makes no sense for a protocol to have a "do nothing"
2253 * function, some default processing is provided.
2254 */
2255
2256int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2257{
2258 return -EOPNOTSUPP;
2259}
2a91525c 2260EXPORT_SYMBOL(sock_no_bind);
1da177e4 2261
4ec93edb 2262int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2263 int len, int flags)
2264{
2265 return -EOPNOTSUPP;
2266}
2a91525c 2267EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2268
2269int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2270{
2271 return -EOPNOTSUPP;
2272}
2a91525c 2273EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2274
2275int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2276{
2277 return -EOPNOTSUPP;
2278}
2a91525c 2279EXPORT_SYMBOL(sock_no_accept);
1da177e4 2280
4ec93edb 2281int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2282 int *len, int peer)
2283{
2284 return -EOPNOTSUPP;
2285}
2a91525c 2286EXPORT_SYMBOL(sock_no_getname);
1da177e4 2287
2a91525c 2288unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2289{
2290 return 0;
2291}
2a91525c 2292EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2293
2294int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2295{
2296 return -EOPNOTSUPP;
2297}
2a91525c 2298EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2299
2300int sock_no_listen(struct socket *sock, int backlog)
2301{
2302 return -EOPNOTSUPP;
2303}
2a91525c 2304EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2305
2306int sock_no_shutdown(struct socket *sock, int how)
2307{
2308 return -EOPNOTSUPP;
2309}
2a91525c 2310EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2311
2312int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2313 char __user *optval, unsigned int optlen)
1da177e4
LT		 2314{
2315 return -EOPNOTSUPP;
2316}
2a91525c 2317EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2318
2319int sock_no_getsockopt(struct socket *sock, int level, int optname,
2320 char __user *optval, int __user *optlen)
2321{
2322 return -EOPNOTSUPP;
2323}
2a91525c 2324EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4 2325
1b784140 2326int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
1da177e4
LT		 2327{
2328 return -EOPNOTSUPP;
2329}
2a91525c 2330EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4 2331
1b784140
YX		 2332int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2333 int flags)
1da177e4
LT		 2334{
2335 return -EOPNOTSUPP;
2336}
2a91525c 2337EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2338
2339int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2340{
2341 /* Mirror missing mmap method error code */
2342 return -ENODEV;
2343}
2a91525c 2344EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2345
2346ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2347{
2348 ssize_t res;
2349 struct msghdr msg = {.msg_flags = flags};
2350 struct kvec iov;
2351 char *kaddr = kmap(page);
2352 iov.iov_base = kaddr + offset;
2353 iov.iov_len = size;
2354 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2355 kunmap(page);
2356 return res;
2357}
2a91525c 2358EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2359
2360/*
2361 * Default Socket Callbacks
2362 */
2363
2364static void sock_def_wakeup(struct sock *sk)
2365{
43815482
ED		 2366 struct socket_wq *wq;
2367
2368 rcu_read_lock();
2369 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2370 if (skwq_has_sleeper(wq))
43815482
ED		 2371 wake_up_interruptible_all(&wq->wait);
2372 rcu_read_unlock();
1da177e4
LT		 2373}
2374
2375static void sock_def_error_report(struct sock *sk)
2376{
43815482
ED		 2377 struct socket_wq *wq;
2378
2379 rcu_read_lock();
2380 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2381 if (skwq_has_sleeper(wq))
43815482 2382 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2383 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2384 rcu_read_unlock();
1da177e4
LT		 2385}
2386
676d2369 2387static void sock_def_readable(struct sock *sk)
1da177e4 2388{
43815482
ED		 2389 struct socket_wq *wq;
2390
2391 rcu_read_lock();
2392 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2393 if (skwq_has_sleeper(wq))
2c6607c6 2394 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2395 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2396 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2397 rcu_read_unlock();
1da177e4
LT		 2398}
2399
2400static void sock_def_write_space(struct sock *sk)
2401{
43815482
ED		 2402 struct socket_wq *wq;
2403
2404 rcu_read_lock();
1da177e4
LT		 2405
2406 /* Do not wake up a writer until he can make "significant"
2407 * progress. --DaveM
2408 */
e71a4783 2409 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482 2410 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2411 if (skwq_has_sleeper(wq))
43815482 2412 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2413 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2414
2415 /* Should agree with poll, otherwise some programs break */
2416 if (sock_writeable(sk))
8d8ad9d7 2417 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2418 }
2419
43815482 2420 rcu_read_unlock();
1da177e4
LT		 2421}
2422
2423static void sock_def_destruct(struct sock *sk)
2424{
1da177e4
LT		 2425}
2426
2427void sk_send_sigurg(struct sock *sk)
2428{
2429 if (sk->sk_socket && sk->sk_socket->file)
2430 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2431 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2432}
2a91525c 2433EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2434
2435void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2436 unsigned long expires)
2437{
2438 if (!mod_timer(timer, expires))
2439 sock_hold(sk);
2440}
1da177e4
LT		 2441EXPORT_SYMBOL(sk_reset_timer);
2442
2443void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2444{
25cc4ae9 2445 if (del_timer(timer))
1da177e4
LT		 2446 __sock_put(sk);
2447}
1da177e4
LT		 2448EXPORT_SYMBOL(sk_stop_timer);
2449
2450void sock_init_data(struct socket *sock, struct sock *sk)
2451{
2452 skb_queue_head_init(&sk->sk_receive_queue);
2453 skb_queue_head_init(&sk->sk_write_queue);
2454 skb_queue_head_init(&sk->sk_error_queue);
2455
2456 sk->sk_send_head = NULL;
2457
2458 init_timer(&sk->sk_timer);
4ec93edb 2459
1da177e4
LT		 2460 sk->sk_allocation = GFP_KERNEL;
2461 sk->sk_rcvbuf = sysctl_rmem_default;
2462 sk->sk_sndbuf = sysctl_wmem_default;
2463 sk->sk_state = TCP_CLOSE;
972692e0 2464 sk_set_socket(sk, sock);
1da177e4
LT		 2465
2466 sock_set_flag(sk, SOCK_ZAPPED);
2467
e71a4783 2468 if (sock) {
1da177e4 2469 sk->sk_type = sock->type;
43815482 2470 sk->sk_wq = sock->wq;
1da177e4 2471 sock->sk = sk;
86741ec2
LC		 2472 sk->sk_uid = SOCK_INODE(sock)->i_uid;
2473 } else {
43815482 2474 sk->sk_wq = NULL;
86741ec2
LC		 2475 sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0);
2476 }
1da177e4 2477
1da177e4 2478 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2479 lockdep_set_class_and_name(&sk->sk_callback_lock,
2480 af_callback_keys + sk->sk_family,
2481 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2482
2483 sk->sk_state_change = sock_def_wakeup;
2484 sk->sk_data_ready = sock_def_readable;
2485 sk->sk_write_space = sock_def_write_space;
2486 sk->sk_error_report = sock_def_error_report;
2487 sk->sk_destruct = sock_def_destruct;
2488
5640f768
ED		 2489 sk->sk_frag.page = NULL;
2490 sk->sk_frag.offset = 0;
ef64a54f 2491 sk->sk_peek_off = -1;
1da177e4 2492
109f6e39
EB		 2493 sk->sk_peer_pid = NULL;
2494 sk->sk_peer_cred = NULL;
1da177e4
LT		 2495 sk->sk_write_pending = 0;
2496 sk->sk_rcvlowat = 1;
2497 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2498 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2499
f37f0afb 2500 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2501
e0d1095a 2502#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2503 sk->sk_napi_id = 0;
64b0dc51 2504 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2505#endif
2506
62748f32 2507 sk->sk_max_pacing_rate = ~0U;
7eec4174 2508 sk->sk_pacing_rate = ~0U;
70da268b 2509 sk->sk_incoming_cpu = -1;
4dc6dc71
ED		 2510 /*
2511 * Before updating sk_refcnt, we must commit prior changes to memory
2512 * (Documentation/RCU/rculist_nulls.txt for details)
2513 */
2514 smp_wmb();
1da177e4 2515 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2516 atomic_set(&sk->sk_drops, 0);
1da177e4 2517}
2a91525c 2518EXPORT_SYMBOL(sock_init_data);
1da177e4 2519
b5606c2d 2520void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2521{
2522 might_sleep();
a5b5bb9a 2523 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2524 if (sk->sk_lock.owned)
1da177e4 2525 __lock_sock(sk);
d2e9117c 2526 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2527 spin_unlock(&sk->sk_lock.slock);
2528 /*
2529 * The sk_lock has mutex_lock() semantics here:
2530 */
fcc70d5f 2531 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2532 local_bh_enable();
1da177e4 2533}
fcc70d5f 2534EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2535
b5606c2d 2536void release_sock(struct sock *sk)
1da177e4 2537{
a5b5bb9a 2538 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2539 if (sk->sk_backlog.tail)
2540 __release_sock(sk);
46d3ceab 2541
c3f9b018
ED		 2542 /* Warning : release_cb() might need to release sk ownership,
2543 * ie call sock_release_ownership(sk) before us.
2544 */
46d3ceab
ED		 2545 if (sk->sk_prot->release_cb)
2546 sk->sk_prot->release_cb(sk);
2547
c3f9b018 2548 sock_release_ownership(sk);
a5b5bb9a
IM		 2549 if (waitqueue_active(&sk->sk_lock.wq))
2550 wake_up(&sk->sk_lock.wq);
2551 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2552}
2553EXPORT_SYMBOL(release_sock);
2554
8a74ad60
ED		 2555/**
2556 * lock_sock_fast - fast version of lock_sock
2557 * @sk: socket
2558 *
2559 * This version should be used for very small section, where process wont block
2560 * return false if fast path is taken
2561 * sk_lock.slock locked, owned = 0, BH disabled
2562 * return true if slow path is taken
2563 * sk_lock.slock unlocked, owned = 1, BH enabled
2564 */
2565bool lock_sock_fast(struct sock *sk)
2566{
2567 might_sleep();
2568 spin_lock_bh(&sk->sk_lock.slock);
2569
2570 if (!sk->sk_lock.owned)
2571 /*
2572 * Note : We must disable BH
2573 */
2574 return false;
2575
2576 __lock_sock(sk);
2577 sk->sk_lock.owned = 1;
2578 spin_unlock(&sk->sk_lock.slock);
2579 /*
2580 * The sk_lock has mutex_lock() semantics here:
2581 */
2582 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2583 local_bh_enable();
2584 return true;
2585}
2586EXPORT_SYMBOL(lock_sock_fast);
2587
1da177e4 2588int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2589{
b7aa0bf7 2590 struct timeval tv;
1da177e4 2591 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2592 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2593 tv = ktime_to_timeval(sk->sk_stamp);
2594 if (tv.tv_sec == -1)
1da177e4 2595 return -ENOENT;
b7aa0bf7
ED		 2596 if (tv.tv_sec == 0) {
2597 sk->sk_stamp = ktime_get_real();
2598 tv = ktime_to_timeval(sk->sk_stamp);
2599 }
2600 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2601}
1da177e4
LT		 2602EXPORT_SYMBOL(sock_get_timestamp);
2603
ae40eb1e
ED		 2604int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2605{
2606 struct timespec ts;
2607 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2608 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2609 ts = ktime_to_timespec(sk->sk_stamp);
2610 if (ts.tv_sec == -1)
2611 return -ENOENT;
2612 if (ts.tv_sec == 0) {
2613 sk->sk_stamp = ktime_get_real();
2614 ts = ktime_to_timespec(sk->sk_stamp);
2615 }
2616 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2617}
2618EXPORT_SYMBOL(sock_get_timestampns);
2619
20d49473 2620void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2621{
20d49473 2622 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2623 unsigned long previous_flags = sk->sk_flags;
2624
20d49473
PO		 2625 sock_set_flag(sk, flag);
2626 /*
2627 * we just set one of the two flags which require net
2628 * time stamping, but time stamping might have been on
2629 * already because of the other one
2630 */
080a270f
HFS		 2631 if (sock_needs_netstamp(sk) &&
2632 !(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2633 net_enable_timestamp();
1da177e4
LT		 2634 }
2635}
1da177e4 2636
cb820f8e
RC		 2637int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2638 int level, int type)
2639{
2640 struct sock_exterr_skb *serr;
364a9e93 2641 struct sk_buff *skb;
cb820f8e
RC		 2642 int copied, err;
2643
2644 err = -EAGAIN;
364a9e93 2645 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 2646 if (skb == NULL)
2647 goto out;
2648
2649 copied = skb->len;
2650 if (copied > len) {
2651 msg->msg_flags |= MSG_TRUNC;
2652 copied = len;
2653 }
51f3d02b 2654 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 2655 if (err)
2656 goto out_free_skb;
2657
2658 sock_recv_timestamp(msg, sk, skb);
2659
2660 serr = SKB_EXT_ERR(skb);
2661 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2662
2663 msg->msg_flags |= MSG_ERRQUEUE;
2664 err = copied;
2665
cb820f8e
RC		 2666out_free_skb:
2667 kfree_skb(skb);
2668out:
2669 return err;
2670}
2671EXPORT_SYMBOL(sock_recv_errqueue);
2672
1da177e4
LT		 2673/*
2674 * Get a socket option on an socket.
2675 *
2676 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2677 * asynchronous errors should be reported by getsockopt. We assume
2678 * this means if you specify SO_ERROR (otherwise whats the point of it).
2679 */
2680int sock_common_getsockopt(struct socket *sock, int level, int optname,
2681 char __user *optval, int __user *optlen)
2682{
2683 struct sock *sk = sock->sk;
2684
2685 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2686}
1da177e4
LT		 2687EXPORT_SYMBOL(sock_common_getsockopt);
2688
3fdadf7d 2689#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2690int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2691 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2692{
2693 struct sock *sk = sock->sk;
2694
1e51f951 2695 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2696 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2697 optval, optlen);
3fdadf7d
DM		 2698 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2699}
2700EXPORT_SYMBOL(compat_sock_common_getsockopt);
2701#endif
2702
1b784140
YX		 2703int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2704 int flags)
1da177e4
LT		 2705{
2706 struct sock *sk = sock->sk;
2707 int addr_len = 0;
2708 int err;
2709
1b784140 2710 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
1da177e4
LT		 2711 flags & ~MSG_DONTWAIT, &addr_len);
2712 if (err >= 0)
2713 msg->msg_namelen = addr_len;
2714 return err;
2715}
1da177e4
LT		 2716EXPORT_SYMBOL(sock_common_recvmsg);
2717
2718/*
2719 * Set socket options on an inet socket.
2720 */
2721int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2722 char __user *optval, unsigned int optlen)
1da177e4
LT		 2723{
2724 struct sock *sk = sock->sk;
2725
2726 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2727}
1da177e4
LT		 2728EXPORT_SYMBOL(sock_common_setsockopt);
2729
3fdadf7d 2730#ifdef CONFIG_COMPAT
543d9cfe 2731int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2732 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2733{
2734 struct sock *sk = sock->sk;
2735
543d9cfe
ACM		 2736 if (sk->sk_prot->compat_setsockopt != NULL)
2737 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2738 optval, optlen);
3fdadf7d
DM		 2739 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2740}
2741EXPORT_SYMBOL(compat_sock_common_setsockopt);
2742#endif
2743
1da177e4
LT		 2744void sk_common_release(struct sock *sk)
2745{
2746 if (sk->sk_prot->destroy)
2747 sk->sk_prot->destroy(sk);
2748
2749 /*
2750 * Observation: when sock_common_release is called, processes have
2751 * no access to socket. But net still has.
2752 * Step one, detach it from networking:
2753 *
2754 * A. Remove from hash tables.
2755 */
2756
2757 sk->sk_prot->unhash(sk);
2758
2759 /*
2760 * In this point socket cannot receive new packets, but it is possible
2761 * that some packets are in flight because some CPU runs receiver and
2762 * did hash table lookup before we unhashed socket. They will achieve
2763 * receive queue and will be purged by socket destructor.
2764 *
2765 * Also we still have packets pending on receive queue and probably,
2766 * our own packets waiting in device queues. sock_destroy will drain
2767 * receive queue, but transmitted packets will delay socket destruction
2768 * until the last reference will be released.
2769 */
2770
2771 sock_orphan(sk);
2772
2773 xfrm_sk_free_policy(sk);
2774
e6848976 2775 sk_refcnt_debug_release(sk);
5640f768
ED		 2776
2777 if (sk->sk_frag.page) {
2778 put_page(sk->sk_frag.page);
2779 sk->sk_frag.page = NULL;
2780 }
2781
1da177e4
LT		 2782 sock_put(sk);
2783}
1da177e4
LT		 2784EXPORT_SYMBOL(sk_common_release);
2785
13ff3d6f
PE		 2786#ifdef CONFIG_PROC_FS
2787#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2788struct prot_inuse {
2789 int val[PROTO_INUSE_NR];
2790};
13ff3d6f
PE		 2791
2792static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2793
2794#ifdef CONFIG_NET_NS
2795void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2796{
d6d9ca0f 2797 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2798}
2799EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2800
2801int sock_prot_inuse_get(struct net *net, struct proto *prot)
2802{
2803 int cpu, idx = prot->inuse_idx;
2804 int res = 0;
2805
2806 for_each_possible_cpu(cpu)
2807 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2808
2809 return res >= 0 ? res : 0;
2810}
2811EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2812
2c8c1e72 2813static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2814{
2815 net->core.inuse = alloc_percpu(struct prot_inuse);
2816 return net->core.inuse ? 0 : -ENOMEM;
2817}
2818
2c8c1e72 2819static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2820{
2821 free_percpu(net->core.inuse);
2822}
2823
2824static struct pernet_operations net_inuse_ops = {
2825 .init = sock_inuse_init_net,
2826 .exit = sock_inuse_exit_net,
2827};
2828
2829static __init int net_inuse_init(void)
2830{
2831 if (register_pernet_subsys(&net_inuse_ops))
2832 panic("Cannot initialize net inuse counters");
2833
2834 return 0;
2835}
2836
2837core_initcall(net_inuse_init);
2838#else
1338d466
PE		 2839static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2840
c29a0bc4 2841void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2842{
d6d9ca0f 2843 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2844}
2845EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2846
c29a0bc4 2847int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2848{
2849 int cpu, idx = prot->inuse_idx;
2850 int res = 0;
2851
2852 for_each_possible_cpu(cpu)
2853 res += per_cpu(prot_inuse, cpu).val[idx];
2854
2855 return res >= 0 ? res : 0;
2856}
2857EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2858#endif
13ff3d6f
PE		 2859
2860static void assign_proto_idx(struct proto *prot)
2861{
2862 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2863
2864 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2865 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2866 return;
2867 }
2868
2869 set_bit(prot->inuse_idx, proto_inuse_idx);
2870}
2871
2872static void release_proto_idx(struct proto *prot)
2873{
2874 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2875 clear_bit(prot->inuse_idx, proto_inuse_idx);
2876}
2877#else
2878static inline void assign_proto_idx(struct proto *prot)
2879{
2880}
2881
2882static inline void release_proto_idx(struct proto *prot)
2883{
2884}
2885#endif
2886
0159dfd3
ED		 2887static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
2888{
2889 if (!rsk_prot)
2890 return;
2891 kfree(rsk_prot->slab_name);
2892 rsk_prot->slab_name = NULL;
adf78eda
JL		 2893 kmem_cache_destroy(rsk_prot->slab);
2894 rsk_prot->slab = NULL;
0159dfd3
ED		 2895}
2896
2897static int req_prot_init(const struct proto *prot)
2898{
2899 struct request_sock_ops *rsk_prot = prot->rsk_prot;
2900
2901 if (!rsk_prot)
2902 return 0;
2903
2904 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
2905 prot->name);
2906 if (!rsk_prot->slab_name)
2907 return -ENOMEM;
2908
2909 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
2910 rsk_prot->obj_size, 0,
e96f78ab 2911 prot->slab_flags, NULL);
0159dfd3
ED		 2912
2913 if (!rsk_prot->slab) {
2914 pr_crit("%s: Can't create request sock SLAB cache!\n",
2915 prot->name);
2916 return -ENOMEM;
2917 }
2918 return 0;
2919}
2920
b733c007
PE		 2921int proto_register(struct proto *prot, int alloc_slab)
2922{
1da177e4
LT		 2923 if (alloc_slab) {
2924 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2925 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2926 NULL);
1da177e4
LT		 2927
2928 if (prot->slab == NULL) {
e005d193
JP		 2929 pr_crit("%s: Can't create sock SLAB cache!\n",
2930 prot->name);
60e7663d 2931 goto out;
1da177e4 2932 }
2e6599cb 2933
0159dfd3
ED		 2934 if (req_prot_init(prot))
2935 goto out_free_request_sock_slab;
8feaf0c0 2936
6d6ee43e 2937 if (prot->twsk_prot != NULL) {
faf23422 2938 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2939
7e56b5d6 2940 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2941 goto out_free_request_sock_slab;
2942
6d6ee43e 2943 prot->twsk_prot->twsk_slab =
7e56b5d6 2944 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2945 prot->twsk_prot->twsk_obj_size,
3ab5aee7 2946 0,
52db70dc 2947 prot->slab_flags,
20c2df83 2948 NULL);
6d6ee43e 2949 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2950 goto out_free_timewait_sock_slab_name;
2951 }
1da177e4
LT		 2952 }
2953
36b77a52 2954 mutex_lock(&proto_list_mutex);
1da177e4 2955 list_add(&prot->node, &proto_list);
13ff3d6f 2956 assign_proto_idx(prot);
36b77a52 2957 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2958 return 0;
2959
8feaf0c0 2960out_free_timewait_sock_slab_name:
7e56b5d6 2961 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0 2962out_free_request_sock_slab:
0159dfd3
ED		 2963 req_prot_cleanup(prot->rsk_prot);
2964
2e6599cb
ACM		 2965 kmem_cache_destroy(prot->slab);
2966 prot->slab = NULL;
b733c007
PE		 2967out:
2968 return -ENOBUFS;
1da177e4 2969}
1da177e4
LT		 2970EXPORT_SYMBOL(proto_register);
2971
2972void proto_unregister(struct proto *prot)
2973{
36b77a52 2974 mutex_lock(&proto_list_mutex);
13ff3d6f 2975 release_proto_idx(prot);
0a3f4358 2976 list_del(&prot->node);
36b77a52 2977 mutex_unlock(&proto_list_mutex);
1da177e4 2978
adf78eda
JL		 2979 kmem_cache_destroy(prot->slab);
2980 prot->slab = NULL;
1da177e4 2981
0159dfd3 2982 req_prot_cleanup(prot->rsk_prot);
2e6599cb 2983
6d6ee43e 2984 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2985 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2986 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2987 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2988 }
1da177e4 2989}
1da177e4
LT		 2990EXPORT_SYMBOL(proto_unregister);
2991
2992#ifdef CONFIG_PROC_FS
1da177e4 2993static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2994 __acquires(proto_list_mutex)
1da177e4 2995{
36b77a52 2996 mutex_lock(&proto_list_mutex);
60f0438a 2997 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2998}
2999
3000static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3001{
60f0438a 3002 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 3003}
3004
3005static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 3006 __releases(proto_list_mutex)
1da177e4 3007{
36b77a52 3008 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 3009}
3010
3011static char proto_method_implemented(const void *method)
3012{
3013 return method == NULL ? 'n' : 'y';
3014}
180d8cd9
GC		 3015static long sock_prot_memory_allocated(struct proto *proto)
3016{
cb75a36c 3017 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 3018}
3019
3020static char *sock_prot_memory_pressure(struct proto *proto)
3021{
3022 return proto->memory_pressure != NULL ?
3023 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
3024}
1da177e4
LT		 3025
3026static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
3027{
180d8cd9 3028
8d987e5c 3029 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 3030 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3031 proto->name,
3032 proto->obj_size,
14e943db 3033 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 3034 sock_prot_memory_allocated(proto),
3035 sock_prot_memory_pressure(proto),
1da177e4
LT		 3036 proto->max_header,
3037 proto->slab == NULL ? "no" : "yes",
3038 module_name(proto->owner),
3039 proto_method_implemented(proto->close),
3040 proto_method_implemented(proto->connect),
3041 proto_method_implemented(proto->disconnect),
3042 proto_method_implemented(proto->accept),
3043 proto_method_implemented(proto->ioctl),
3044 proto_method_implemented(proto->init),
3045 proto_method_implemented(proto->destroy),
3046 proto_method_implemented(proto->shutdown),
3047 proto_method_implemented(proto->setsockopt),
3048 proto_method_implemented(proto->getsockopt),
3049 proto_method_implemented(proto->sendmsg),
3050 proto_method_implemented(proto->recvmsg),
3051 proto_method_implemented(proto->sendpage),
3052 proto_method_implemented(proto->bind),
3053 proto_method_implemented(proto->backlog_rcv),
3054 proto_method_implemented(proto->hash),
3055 proto_method_implemented(proto->unhash),
3056 proto_method_implemented(proto->get_port),
3057 proto_method_implemented(proto->enter_memory_pressure));
3058}
3059
3060static int proto_seq_show(struct seq_file *seq, void *v)
3061{
60f0438a 3062 if (v == &proto_list)
1da177e4
LT		 3063 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3064 "protocol",
3065 "size",
3066 "sockets",
3067 "memory",
3068 "press",
3069 "maxhdr",
3070 "slab",
3071 "module",
3072 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3073 else
60f0438a 3074 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 3075 return 0;
3076}
3077
f690808e 3078static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 3079 .start = proto_seq_start,
3080 .next = proto_seq_next,
3081 .stop = proto_seq_stop,
3082 .show = proto_seq_show,
3083};
3084
3085static int proto_seq_open(struct inode *inode, struct file *file)
3086{
14e943db
ED		 3087 return seq_open_net(inode, file, &proto_seq_ops,
3088 sizeof(struct seq_net_private));
1da177e4
LT		 3089}
3090
9a32144e 3091static const struct file_operations proto_seq_fops = {
1da177e4
LT		 3092 .owner = THIS_MODULE,
3093 .open = proto_seq_open,
3094 .read = seq_read,
3095 .llseek = seq_lseek,
14e943db
ED		 3096 .release = seq_release_net,
3097};
3098
3099static __net_init int proto_init_net(struct net *net)
3100{
d4beaa66 3101 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 3102 return -ENOMEM;
3103
3104 return 0;
3105}
3106
3107static __net_exit void proto_exit_net(struct net *net)
3108{
ece31ffd 3109 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 3110}
3111
3112
3113static __net_initdata struct pernet_operations proto_net_ops = {
3114 .init = proto_init_net,
3115 .exit = proto_exit_net,
1da177e4
LT		 3116};
3117
3118static int __init proto_init(void)
3119{
14e943db 3120 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 3121}
3122
3123subsys_initcall(proto_init);
3124
3125#endif /* PROC_FS */
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