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[mirror_ubuntu-zesty-kernel.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
4ec93edb 35 * code. The ACK stuff can wait and needs major
1da177e4
LT		 36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 *
85 *
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
90 */
91
e005d193
JP		 92#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
93
4fc268d2 94#include <linux/capability.h>
1da177e4 95#include <linux/errno.h>
cb820f8e 96#include <linux/errqueue.h>
1da177e4
LT		 97#include <linux/types.h>
98#include <linux/socket.h>
99#include <linux/in.h>
100#include <linux/kernel.h>
1da177e4
LT		 101#include <linux/module.h>
102#include <linux/proc_fs.h>
103#include <linux/seq_file.h>
104#include <linux/sched.h>
105#include <linux/timer.h>
106#include <linux/string.h>
107#include <linux/sockios.h>
108#include <linux/net.h>
109#include <linux/mm.h>
110#include <linux/slab.h>
111#include <linux/interrupt.h>
112#include <linux/poll.h>
113#include <linux/tcp.h>
114#include <linux/init.h>
a1f8e7f7 115#include <linux/highmem.h>
3f551f94 116#include <linux/user_namespace.h>
c5905afb 117#include <linux/static_key.h>
3969eb38 118#include <linux/memcontrol.h>
8c1ae10d 119#include <linux/prefetch.h>
1da177e4
LT		 120
121#include <asm/uaccess.h>
1da177e4
LT		 122
123#include <linux/netdevice.h>
124#include <net/protocol.h>
125#include <linux/skbuff.h>
457c4cbc 126#include <net/net_namespace.h>
2e6599cb 127#include <net/request_sock.h>
1da177e4 128#include <net/sock.h>
20d49473 129#include <linux/net_tstamp.h>
1da177e4
LT		 130#include <net/xfrm.h>
131#include <linux/ipsec.h>
f8451725 132#include <net/cls_cgroup.h>
5bc1421e 133#include <net/netprio_cgroup.h>
eb4cb008 134#include <linux/sock_diag.h>
1da177e4
LT		 135
136#include <linux/filter.h>
538950a1 137#include <net/sock_reuseport.h>
1da177e4 138
3847ce32
SM		 139#include <trace/events/sock.h>
140
1da177e4
LT		 141#ifdef CONFIG_INET
142#include <net/tcp.h>
143#endif
144
076bb0c8 145#include <net/busy_poll.h>
06021292 146
36b77a52 147static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 148static LIST_HEAD(proto_list);
149
a3b299da
EB		 150/**
151 * sk_ns_capable - General socket capability test
152 * @sk: Socket to use a capability on or through
153 * @user_ns: The user namespace of the capability to use
154 * @cap: The capability to use
155 *
156 * Test to see if the opener of the socket had when the socket was
157 * created and the current process has the capability @cap in the user
158 * namespace @user_ns.
159 */
160bool sk_ns_capable(const struct sock *sk,
161 struct user_namespace *user_ns, int cap)
162{
163 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
164 ns_capable(user_ns, cap);
165}
166EXPORT_SYMBOL(sk_ns_capable);
167
168/**
169 * sk_capable - Socket global capability test
170 * @sk: Socket to use a capability on or through
e793c0f7 171 * @cap: The global capability to use
a3b299da
EB		 172 *
173 * Test to see if the opener of the socket had when the socket was
174 * created and the current process has the capability @cap in all user
175 * namespaces.
176 */
177bool sk_capable(const struct sock *sk, int cap)
178{
179 return sk_ns_capable(sk, &init_user_ns, cap);
180}
181EXPORT_SYMBOL(sk_capable);
182
183/**
184 * sk_net_capable - Network namespace socket capability test
185 * @sk: Socket to use a capability on or through
186 * @cap: The capability to use
187 *
e793c0f7 188 * Test to see if the opener of the socket had when the socket was created
a3b299da
EB		 189 * and the current process has the capability @cap over the network namespace
190 * the socket is a member of.
191 */
192bool sk_net_capable(const struct sock *sk, int cap)
193{
194 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
195}
196EXPORT_SYMBOL(sk_net_capable);
197
da21f24d
IM		 198/*
199 * Each address family might have different locking rules, so we have
200 * one slock key per address family:
201 */
a5b5bb9a
IM		 202static struct lock_class_key af_family_keys[AF_MAX];
203static struct lock_class_key af_family_slock_keys[AF_MAX];
204
a5b5bb9a
IM		 205/*
206 * Make lock validator output more readable. (we pre-construct these
207 * strings build-time, so that runtime initialization of socket
208 * locks is fast):
209 */
36cbd3dc 210static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 211 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
212 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
213 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
214 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
215 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
216 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
217 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 218 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 219 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 220 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 221 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 222 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 223 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
0a1a37b6
DC		 224 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_KCM" ,
225 "sk_lock-AF_MAX"
a5b5bb9a 226};
36cbd3dc 227static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 228 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
229 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
230 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
231 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
232 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
233 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
234 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 235 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 236 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 237 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 238 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 239 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 240 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
0a1a37b6
DC		 241 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_KCM" ,
242 "slock-AF_MAX"
a5b5bb9a 243};
36cbd3dc 244static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 245 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
246 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
247 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
248 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
249 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
250 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
251 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 252 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 253 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 254 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 255 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 256 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 257 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
0a1a37b6
DC		 258 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_KCM" ,
259 "clock-AF_MAX"
443aef0e 260};
da21f24d
IM		 261
262/*
263 * sk_callback_lock locking rules are per-address-family,
264 * so split the lock classes by using a per-AF key:
265 */
266static struct lock_class_key af_callback_keys[AF_MAX];
267
1da177e4
LT		 268/* Take into consideration the size of the struct sk_buff overhead in the
269 * determination of these values, since that is non-constant across
270 * platforms. This makes socket queueing behavior and performance
271 * not depend upon such differences.
272 */
273#define _SK_MEM_PACKETS 256
87fb4b7b 274#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 275#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
276#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
277
278/* Run time adjustable parameters. */
ab32ea5d 279__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 280EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 281__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 282EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 283__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
284__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 285
25985edc 286/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 287int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 288EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 289
b245be1f
WB		 290int sysctl_tstamp_allow_data __read_mostly = 1;
291
c93bdd0e
MG		 292struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
293EXPORT_SYMBOL_GPL(memalloc_socks);
294
7cb02404
MG		 295/**
296 * sk_set_memalloc - sets %SOCK_MEMALLOC
297 * @sk: socket to set it on
298 *
299 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
300 * It's the responsibility of the admin to adjust min_free_kbytes
301 * to meet the requirements
302 */
303void sk_set_memalloc(struct sock *sk)
304{
305 sock_set_flag(sk, SOCK_MEMALLOC);
306 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 307 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 308}
309EXPORT_SYMBOL_GPL(sk_set_memalloc);
310
311void sk_clear_memalloc(struct sock *sk)
312{
313 sock_reset_flag(sk, SOCK_MEMALLOC);
314 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 315 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 316
317 /*
318 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
5d753610
MG		 319 * progress of swapping. SOCK_MEMALLOC may be cleared while
320 * it has rmem allocations due to the last swapfile being deactivated
321 * but there is a risk that the socket is unusable due to exceeding
322 * the rmem limits. Reclaim the reserves and obey rmem limits again.
c76562b6 323 */
5d753610 324 sk_mem_reclaim(sk);
7cb02404
MG		 325}
326EXPORT_SYMBOL_GPL(sk_clear_memalloc);
327
b4b9e355
MG		 328int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
329{
330 int ret;
331 unsigned long pflags = current->flags;
332
333 /* these should have been dropped before queueing */
334 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
335
336 current->flags |= PF_MEMALLOC;
337 ret = sk->sk_backlog_rcv(sk, skb);
338 tsk_restore_flags(current, pflags, PF_MEMALLOC);
339
340 return ret;
341}
342EXPORT_SYMBOL(__sk_backlog_rcv);
343
1da177e4
LT		 344static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
345{
346 struct timeval tv;
347
348 if (optlen < sizeof(tv))
349 return -EINVAL;
350 if (copy_from_user(&tv, optval, sizeof(tv)))
351 return -EFAULT;
ba78073e
VA		 352 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
353 return -EDOM;
1da177e4 354
ba78073e 355 if (tv.tv_sec < 0) {
6f11df83
AM		 356 static int warned __read_mostly;
357
ba78073e 358 *timeo_p = 0;
50aab54f 359 if (warned < 10 && net_ratelimit()) {
ba78073e 360 warned++;
e005d193
JP		 361 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
362 __func__, current->comm, task_pid_nr(current));
50aab54f 363 }
ba78073e
VA		 364 return 0;
365 }
1da177e4
LT		 366 *timeo_p = MAX_SCHEDULE_TIMEOUT;
367 if (tv.tv_sec == 0 && tv.tv_usec == 0)
368 return 0;
369 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
370 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
371 return 0;
372}
373
374static void sock_warn_obsolete_bsdism(const char *name)
375{
376 static int warned;
377 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 378 if (strcmp(warncomm, current->comm) && warned < 5) {
379 strcpy(warncomm, current->comm);
e005d193
JP		 380 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
381 warncomm, name);
1da177e4
LT		 382 warned++;
383 }
384}
385
080a270f
HFS		 386static bool sock_needs_netstamp(const struct sock *sk)
387{
388 switch (sk->sk_family) {
389 case AF_UNSPEC:
390 case AF_UNIX:
391 return false;
392 default:
393 return true;
394 }
395}
396
08e29af3 397static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 398{
08e29af3
ED		 399 if (sk->sk_flags & flags) {
400 sk->sk_flags &= ~flags;
080a270f
HFS		 401 if (sock_needs_netstamp(sk) &&
402 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 403 net_disable_timestamp();
1da177e4
LT		 404 }
405}
406
407
e6afc8ac 408int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
f0088a50 409{
3b885787
NH		 410 unsigned long flags;
411 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 412
0fd7bac6 413 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 414 atomic_inc(&sk->sk_drops);
3847ce32 415 trace_sock_rcvqueue_full(sk, skb);
766e9037 416 return -ENOMEM;
f0088a50
DV		 417 }
418
c76562b6 419 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 420 atomic_inc(&sk->sk_drops);
421 return -ENOBUFS;
3ab224be
HA		 422 }
423
f0088a50
DV		 424 skb->dev = NULL;
425 skb_set_owner_r(skb, sk);
49ad9599 426
7fee226a
ED		 427 /* we escape from rcu protected region, make sure we dont leak
428 * a norefcounted dst
429 */
430 skb_dst_force(skb);
431
3b885787 432 spin_lock_irqsave(&list->lock, flags);
3bc3b96f 433 sock_skb_set_dropcount(sk, skb);
3b885787
NH		 434 __skb_queue_tail(list, skb);
435 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 436
437 if (!sock_flag(sk, SOCK_DEAD))
676d2369 438 sk->sk_data_ready(sk);
766e9037 439 return 0;
f0088a50 440}
e6afc8ac 441EXPORT_SYMBOL(__sock_queue_rcv_skb);
442
443int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
444{
445 int err;
446
447 err = sk_filter(sk, skb);
448 if (err)
449 return err;
450
451 return __sock_queue_rcv_skb(sk, skb);
452}
f0088a50
DV		 453EXPORT_SYMBOL(sock_queue_rcv_skb);
454
4f0c40d9
WB		 455int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
456 const int nested, unsigned int trim_cap)
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:
490 sock_put(sk);
491 return rc;
492discard_and_relse:
493 kfree_skb(skb);
494 goto out;
495}
4f0c40d9 496EXPORT_SYMBOL(__sk_receive_skb);
f0088a50
DV		 497
498struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
499{
b6c6712a 500 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 501
502 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 503 sk_tx_queue_clear(sk);
a9b3cd7f 504 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 505 dst_release(dst);
506 return NULL;
507 }
508
509 return dst;
510}
511EXPORT_SYMBOL(__sk_dst_check);
512
513struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
514{
515 struct dst_entry *dst = sk_dst_get(sk);
516
517 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
518 sk_dst_reset(sk);
519 dst_release(dst);
520 return NULL;
521 }
522
523 return dst;
524}
525EXPORT_SYMBOL(sk_dst_check);
526
c91f6df2
BH		 527static int sock_setbindtodevice(struct sock *sk, char __user *optval,
528 int optlen)
4878809f
DM		 529{
530 int ret = -ENOPROTOOPT;
531#ifdef CONFIG_NETDEVICES
3b1e0a65 532 struct net *net = sock_net(sk);
4878809f
DM		 533 char devname[IFNAMSIZ];
534 int index;
535
536 /* Sorry... */
537 ret = -EPERM;
5e1fccc0 538 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 539 goto out;
540
541 ret = -EINVAL;
542 if (optlen < 0)
543 goto out;
544
545 /* Bind this socket to a particular device like "eth0",
546 * as specified in the passed interface name. If the
547 * name is "" or the option length is zero the socket
548 * is not bound.
549 */
550 if (optlen > IFNAMSIZ - 1)
551 optlen = IFNAMSIZ - 1;
552 memset(devname, 0, sizeof(devname));
553
554 ret = -EFAULT;
555 if (copy_from_user(devname, optval, optlen))
556 goto out;
557
000ba2e4
DM		 558 index = 0;
559 if (devname[0] != '\0') {
bf8e56bf 560 struct net_device *dev;
4878809f 561
bf8e56bf
ED		 562 rcu_read_lock();
563 dev = dev_get_by_name_rcu(net, devname);
564 if (dev)
565 index = dev->ifindex;
566 rcu_read_unlock();
4878809f
DM		 567 ret = -ENODEV;
568 if (!dev)
569 goto out;
4878809f
DM		 570 }
571
572 lock_sock(sk);
573 sk->sk_bound_dev_if = index;
574 sk_dst_reset(sk);
575 release_sock(sk);
576
577 ret = 0;
578
579out:
580#endif
581
582 return ret;
583}
584
c91f6df2
BH		 585static int sock_getbindtodevice(struct sock *sk, char __user *optval,
586 int __user *optlen, int len)
587{
588 int ret = -ENOPROTOOPT;
589#ifdef CONFIG_NETDEVICES
590 struct net *net = sock_net(sk);
c91f6df2 591 char devname[IFNAMSIZ];
c91f6df2
BH		 592
593 if (sk->sk_bound_dev_if == 0) {
594 len = 0;
595 goto zero;
596 }
597
598 ret = -EINVAL;
599 if (len < IFNAMSIZ)
600 goto out;
601
5dbe7c17
NS		 602 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
603 if (ret)
c91f6df2 604 goto out;
c91f6df2
BH		 605
606 len = strlen(devname) + 1;
607
608 ret = -EFAULT;
609 if (copy_to_user(optval, devname, len))
610 goto out;
611
612zero:
613 ret = -EFAULT;
614 if (put_user(len, optlen))
615 goto out;
616
617 ret = 0;
618
619out:
620#endif
621
622 return ret;
623}
624
c0ef877b
PE		 625static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
626{
627 if (valbool)
628 sock_set_flag(sk, bit);
629 else
630 sock_reset_flag(sk, bit);
631}
632
f60e5990 633bool sk_mc_loop(struct sock *sk)
634{
635 if (dev_recursion_level())
636 return false;
637 if (!sk)
638 return true;
639 switch (sk->sk_family) {
640 case AF_INET:
641 return inet_sk(sk)->mc_loop;
642#if IS_ENABLED(CONFIG_IPV6)
643 case AF_INET6:
644 return inet6_sk(sk)->mc_loop;
645#endif
646 }
647 WARN_ON(1);
648 return true;
649}
650EXPORT_SYMBOL(sk_mc_loop);
651
1da177e4
LT		 652/*
653 * This is meant for all protocols to use and covers goings on
654 * at the socket level. Everything here is generic.
655 */
656
657int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 658 char __user *optval, unsigned int optlen)
1da177e4 659{
2a91525c 660 struct sock *sk = sock->sk;
1da177e4
LT		 661 int val;
662 int valbool;
663 struct linger ling;
664 int ret = 0;
4ec93edb 665
1da177e4
LT		 666 /*
667 * Options without arguments
668 */
669
4878809f 670 if (optname == SO_BINDTODEVICE)
c91f6df2 671 return sock_setbindtodevice(sk, optval, optlen);
4878809f 672
e71a4783
SH		 673 if (optlen < sizeof(int))
674 return -EINVAL;
4ec93edb 675
1da177e4
LT		 676 if (get_user(val, (int __user *)optval))
677 return -EFAULT;
4ec93edb 678
2a91525c 679 valbool = val ? 1 : 0;
1da177e4
LT		 680
681 lock_sock(sk);
682
2a91525c 683 switch (optname) {
e71a4783 684 case SO_DEBUG:
2a91525c 685 if (val && !capable(CAP_NET_ADMIN))
e71a4783 686 ret = -EACCES;
2a91525c 687 else
c0ef877b 688 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 689 break;
690 case SO_REUSEADDR:
4a17fd52 691 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 692 break;
055dc21a
TH		 693 case SO_REUSEPORT:
694 sk->sk_reuseport = valbool;
695 break;
e71a4783 696 case SO_TYPE:
49c794e9 697 case SO_PROTOCOL:
0d6038ee 698 case SO_DOMAIN:
e71a4783
SH		 699 case SO_ERROR:
700 ret = -ENOPROTOOPT;
701 break;
702 case SO_DONTROUTE:
c0ef877b 703 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 704 break;
705 case SO_BROADCAST:
706 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
707 break;
708 case SO_SNDBUF:
709 /* Don't error on this BSD doesn't and if you think
82981930
ED		 710 * about it this is right. Otherwise apps have to
711 * play 'guess the biggest size' games. RCVBUF/SNDBUF
712 * are treated in BSD as hints
713 */
714 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 715set_sndbuf:
e71a4783 716 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 717 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
718 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 719 sk->sk_write_space(sk);
720 break;
1da177e4 721
e71a4783
SH		 722 case SO_SNDBUFFORCE:
723 if (!capable(CAP_NET_ADMIN)) {
724 ret = -EPERM;
725 break;
726 }
727 goto set_sndbuf;
b0573dea 728
e71a4783
SH		 729 case SO_RCVBUF:
730 /* Don't error on this BSD doesn't and if you think
82981930
ED		 731 * about it this is right. Otherwise apps have to
732 * play 'guess the biggest size' games. RCVBUF/SNDBUF
733 * are treated in BSD as hints
734 */
735 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 736set_rcvbuf:
e71a4783
SH		 737 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
738 /*
739 * We double it on the way in to account for
740 * "struct sk_buff" etc. overhead. Applications
741 * assume that the SO_RCVBUF setting they make will
742 * allow that much actual data to be received on that
743 * socket.
744 *
745 * Applications are unaware that "struct sk_buff" and
746 * other overheads allocate from the receive buffer
747 * during socket buffer allocation.
748 *
749 * And after considering the possible alternatives,
750 * returning the value we actually used in getsockopt
751 * is the most desirable behavior.
752 */
82981930 753 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 754 break;
755
756 case SO_RCVBUFFORCE:
757 if (!capable(CAP_NET_ADMIN)) {
758 ret = -EPERM;
1da177e4 759 break;
e71a4783
SH		 760 }
761 goto set_rcvbuf;
1da177e4 762
e71a4783 763 case SO_KEEPALIVE:
1da177e4 764#ifdef CONFIG_INET
3e10986d
ED		 765 if (sk->sk_protocol == IPPROTO_TCP &&
766 sk->sk_type == SOCK_STREAM)
e71a4783 767 tcp_set_keepalive(sk, valbool);
1da177e4 768#endif
e71a4783
SH		 769 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
770 break;
771
772 case SO_OOBINLINE:
773 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
774 break;
775
776 case SO_NO_CHECK:
28448b80 777 sk->sk_no_check_tx = valbool;
e71a4783
SH		 778 break;
779
780 case SO_PRIORITY:
5e1fccc0
EB		 781 if ((val >= 0 && val <= 6) ||
782 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 783 sk->sk_priority = val;
784 else
785 ret = -EPERM;
786 break;
787
788 case SO_LINGER:
789 if (optlen < sizeof(ling)) {
790 ret = -EINVAL; /* 1003.1g */
1da177e4 791 break;
e71a4783 792 }
2a91525c 793 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 794 ret = -EFAULT;
1da177e4 795 break;
e71a4783
SH		 796 }
797 if (!ling.l_onoff)
798 sock_reset_flag(sk, SOCK_LINGER);
799 else {
1da177e4 800#if (BITS_PER_LONG == 32)
e71a4783
SH		 801 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
802 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 803 else
e71a4783
SH		 804#endif
805 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
806 sock_set_flag(sk, SOCK_LINGER);
807 }
808 break;
809
810 case SO_BSDCOMPAT:
811 sock_warn_obsolete_bsdism("setsockopt");
812 break;
813
814 case SO_PASSCRED:
815 if (valbool)
816 set_bit(SOCK_PASSCRED, &sock->flags);
817 else
818 clear_bit(SOCK_PASSCRED, &sock->flags);
819 break;
820
821 case SO_TIMESTAMP:
92f37fd2 822 case SO_TIMESTAMPNS:
e71a4783 823 if (valbool) {
92f37fd2
ED		 824 if (optname == SO_TIMESTAMP)
825 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
826 else
827 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 828 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 829 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 830 } else {
e71a4783 831 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 832 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
833 }
e71a4783
SH		 834 break;
835
20d49473
PO		 836 case SO_TIMESTAMPING:
837 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 838 ret = -EINVAL;
20d49473
PO		 839 break;
840 }
b245be1f 841
09c2d251 842 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765 843 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
ac5cc977
WC		 844 if (sk->sk_protocol == IPPROTO_TCP &&
845 sk->sk_type == SOCK_STREAM) {
6db8b963
SHY		 846 if ((1 << sk->sk_state) &
847 (TCPF_CLOSE | TCPF_LISTEN)) {
4ed2d765
WB		 848 ret = -EINVAL;
849 break;
850 }
851 sk->sk_tskey = tcp_sk(sk)->snd_una;
852 } else {
853 sk->sk_tskey = 0;
854 }
855 }
b9f40e21 856 sk->sk_tsflags = val;
20d49473
PO		 857 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
858 sock_enable_timestamp(sk,
859 SOCK_TIMESTAMPING_RX_SOFTWARE);
860 else
861 sock_disable_timestamp(sk,
08e29af3 862 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 863 break;
864
e71a4783
SH		 865 case SO_RCVLOWAT:
866 if (val < 0)
867 val = INT_MAX;
868 sk->sk_rcvlowat = val ? : 1;
869 break;
870
871 case SO_RCVTIMEO:
872 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
873 break;
874
875 case SO_SNDTIMEO:
876 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
877 break;
1da177e4 878
e71a4783
SH		 879 case SO_ATTACH_FILTER:
880 ret = -EINVAL;
881 if (optlen == sizeof(struct sock_fprog)) {
882 struct sock_fprog fprog;
1da177e4 883
e71a4783
SH		 884 ret = -EFAULT;
885 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 886 break;
e71a4783
SH		 887
888 ret = sk_attach_filter(&fprog, sk);
889 }
890 break;
891
89aa0758
AS		 892 case SO_ATTACH_BPF:
893 ret = -EINVAL;
894 if (optlen == sizeof(u32)) {
895 u32 ufd;
896
897 ret = -EFAULT;
898 if (copy_from_user(&ufd, optval, sizeof(ufd)))
899 break;
900
901 ret = sk_attach_bpf(ufd, sk);
902 }
903 break;
904
538950a1
CG		 905 case SO_ATTACH_REUSEPORT_CBPF:
906 ret = -EINVAL;
907 if (optlen == sizeof(struct sock_fprog)) {
908 struct sock_fprog fprog;
909
910 ret = -EFAULT;
911 if (copy_from_user(&fprog, optval, sizeof(fprog)))
912 break;
913
914 ret = sk_reuseport_attach_filter(&fprog, sk);
915 }
916 break;
917
918 case SO_ATTACH_REUSEPORT_EBPF:
919 ret = -EINVAL;
920 if (optlen == sizeof(u32)) {
921 u32 ufd;
922
923 ret = -EFAULT;
924 if (copy_from_user(&ufd, optval, sizeof(ufd)))
925 break;
926
927 ret = sk_reuseport_attach_bpf(ufd, sk);
928 }
929 break;
930
e71a4783 931 case SO_DETACH_FILTER:
55b33325 932 ret = sk_detach_filter(sk);
e71a4783 933 break;
1da177e4 934
d59577b6
VB		 935 case SO_LOCK_FILTER:
936 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
937 ret = -EPERM;
938 else
939 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
940 break;
941
e71a4783
SH		 942 case SO_PASSSEC:
943 if (valbool)
944 set_bit(SOCK_PASSSEC, &sock->flags);
945 else
946 clear_bit(SOCK_PASSSEC, &sock->flags);
947 break;
4a19ec58 948 case SO_MARK:
5e1fccc0 949 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 950 ret = -EPERM;
2a91525c 951 else
4a19ec58 952 sk->sk_mark = val;
4a19ec58 953 break;
877ce7c1 954
3b885787 955 case SO_RXQ_OVFL:
8083f0fc 956 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 957 break;
6e3e939f
JB		 958
959 case SO_WIFI_STATUS:
960 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
961 break;
962
ef64a54f
PE		 963 case SO_PEEK_OFF:
964 if (sock->ops->set_peek_off)
12663bfc 965 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 966 else
967 ret = -EOPNOTSUPP;
968 break;
3bdc0eba
BG		 969
970 case SO_NOFCS:
971 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
972 break;
973
7d4c04fc
KJ		 974 case SO_SELECT_ERR_QUEUE:
975 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
976 break;
977
e0d1095a 978#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 979 case SO_BUSY_POLL:
dafcc438
ET		 980 /* allow unprivileged users to decrease the value */
981 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
982 ret = -EPERM;
983 else {
984 if (val < 0)
985 ret = -EINVAL;
986 else
987 sk->sk_ll_usec = val;
988 }
989 break;
990#endif
62748f32
ED		 991
992 case SO_MAX_PACING_RATE:
993 sk->sk_max_pacing_rate = val;
994 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
995 sk->sk_max_pacing_rate);
996 break;
997
70da268b
ED		 998 case SO_INCOMING_CPU:
999 sk->sk_incoming_cpu = val;
1000 break;
1001
a87cb3e4
TH		 1002 case SO_CNX_ADVICE:
1003 if (val == 1)
1004 dst_negative_advice(sk);
1005 break;
e71a4783
SH		 1006 default:
1007 ret = -ENOPROTOOPT;
1008 break;
4ec93edb 1009 }
1da177e4
LT		 1010 release_sock(sk);
1011 return ret;
1012}
2a91525c 1013EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 1014
1015
8f09898b 1016static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1017 struct ucred *ucred)
3f551f94
EB		 1018{
1019 ucred->pid = pid_vnr(pid);
1020 ucred->uid = ucred->gid = -1;
1021 if (cred) {
1022 struct user_namespace *current_ns = current_user_ns();
1023
b2e4f544
EB		 1024 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1025 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 1026 }
1027}
1028
1da177e4
LT		 1029int sock_getsockopt(struct socket *sock, int level, int optname,
1030 char __user *optval, int __user *optlen)
1031{
1032 struct sock *sk = sock->sk;
4ec93edb 1033
e71a4783 1034 union {
4ec93edb
YH		 1035 int val;
1036 struct linger ling;
1da177e4
LT		 1037 struct timeval tm;
1038 } v;
4ec93edb 1039
4d0392be 1040 int lv = sizeof(int);
1da177e4 1041 int len;
4ec93edb 1042
e71a4783 1043 if (get_user(len, optlen))
4ec93edb 1044 return -EFAULT;
e71a4783 1045 if (len < 0)
1da177e4 1046 return -EINVAL;
4ec93edb 1047
50fee1de 1048 memset(&v, 0, sizeof(v));
df0bca04 1049
2a91525c 1050 switch (optname) {
e71a4783
SH		 1051 case SO_DEBUG:
1052 v.val = sock_flag(sk, SOCK_DBG);
1053 break;
1054
1055 case SO_DONTROUTE:
1056 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1057 break;
1058
1059 case SO_BROADCAST:
1b23a5df 1060 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1061 break;
1062
1063 case SO_SNDBUF:
1064 v.val = sk->sk_sndbuf;
1065 break;
1066
1067 case SO_RCVBUF:
1068 v.val = sk->sk_rcvbuf;
1069 break;
1070
1071 case SO_REUSEADDR:
1072 v.val = sk->sk_reuse;
1073 break;
1074
055dc21a
TH		 1075 case SO_REUSEPORT:
1076 v.val = sk->sk_reuseport;
1077 break;
1078
e71a4783 1079 case SO_KEEPALIVE:
1b23a5df 1080 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1081 break;
1082
1083 case SO_TYPE:
1084 v.val = sk->sk_type;
1085 break;
1086
49c794e9
JE		 1087 case SO_PROTOCOL:
1088 v.val = sk->sk_protocol;
1089 break;
1090
0d6038ee
JE		 1091 case SO_DOMAIN:
1092 v.val = sk->sk_family;
1093 break;
1094
e71a4783
SH		 1095 case SO_ERROR:
1096 v.val = -sock_error(sk);
2a91525c 1097 if (v.val == 0)
e71a4783
SH		 1098 v.val = xchg(&sk->sk_err_soft, 0);
1099 break;
1100
1101 case SO_OOBINLINE:
1b23a5df 1102 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1103 break;
1104
1105 case SO_NO_CHECK:
28448b80 1106 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1107 break;
1108
1109 case SO_PRIORITY:
1110 v.val = sk->sk_priority;
1111 break;
1112
1113 case SO_LINGER:
1114 lv = sizeof(v.ling);
1b23a5df 1115 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1116 v.ling.l_linger = sk->sk_lingertime / HZ;
1117 break;
1118
1119 case SO_BSDCOMPAT:
1120 sock_warn_obsolete_bsdism("getsockopt");
1121 break;
1122
1123 case SO_TIMESTAMP:
92f37fd2
ED		 1124 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1125 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1126 break;
1127
1128 case SO_TIMESTAMPNS:
1129 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1130 break;
1131
20d49473 1132 case SO_TIMESTAMPING:
b9f40e21 1133 v.val = sk->sk_tsflags;
20d49473
PO		 1134 break;
1135
e71a4783 1136 case SO_RCVTIMEO:
2a91525c 1137 lv = sizeof(struct timeval);
e71a4783
SH		 1138 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1139 v.tm.tv_sec = 0;
1140 v.tm.tv_usec = 0;
1141 } else {
1142 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1143 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1144 }
1145 break;
1146
1147 case SO_SNDTIMEO:
2a91525c 1148 lv = sizeof(struct timeval);
e71a4783
SH		 1149 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1150 v.tm.tv_sec = 0;
1151 v.tm.tv_usec = 0;
1152 } else {
1153 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1154 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1155 }
1156 break;
1da177e4 1157
e71a4783
SH		 1158 case SO_RCVLOWAT:
1159 v.val = sk->sk_rcvlowat;
1160 break;
1da177e4 1161
e71a4783 1162 case SO_SNDLOWAT:
2a91525c 1163 v.val = 1;
e71a4783 1164 break;
1da177e4 1165
e71a4783 1166 case SO_PASSCRED:
82981930 1167 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1168 break;
1da177e4 1169
e71a4783 1170 case SO_PEERCRED:
109f6e39
EB		 1171 {
1172 struct ucred peercred;
1173 if (len > sizeof(peercred))
1174 len = sizeof(peercred);
1175 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1176 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1177 return -EFAULT;
1178 goto lenout;
109f6e39 1179 }
1da177e4 1180
e71a4783
SH		 1181 case SO_PEERNAME:
1182 {
1183 char address[128];
1184
1185 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1186 return -ENOTCONN;
1187 if (lv < len)
1188 return -EINVAL;
1189 if (copy_to_user(optval, address, len))
1190 return -EFAULT;
1191 goto lenout;
1192 }
1da177e4 1193
e71a4783
SH		 1194 /* Dubious BSD thing... Probably nobody even uses it, but
1195 * the UNIX standard wants it for whatever reason... -DaveM
1196 */
1197 case SO_ACCEPTCONN:
1198 v.val = sk->sk_state == TCP_LISTEN;
1199 break;
1da177e4 1200
e71a4783 1201 case SO_PASSSEC:
82981930 1202 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1203 break;
877ce7c1 1204
e71a4783
SH		 1205 case SO_PEERSEC:
1206 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1207
4a19ec58
LAT		 1208 case SO_MARK:
1209 v.val = sk->sk_mark;
1210 break;
1211
3b885787 1212 case SO_RXQ_OVFL:
1b23a5df 1213 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1214 break;
1215
6e3e939f 1216 case SO_WIFI_STATUS:
1b23a5df 1217 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1218 break;
1219
ef64a54f
PE		 1220 case SO_PEEK_OFF:
1221 if (!sock->ops->set_peek_off)
1222 return -EOPNOTSUPP;
1223
1224 v.val = sk->sk_peek_off;
1225 break;
bc2f7996 1226 case SO_NOFCS:
1b23a5df 1227 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1228 break;
c91f6df2 1229
f7b86bfe 1230 case SO_BINDTODEVICE:
c91f6df2
BH		 1231 return sock_getbindtodevice(sk, optval, optlen, len);
1232
a8fc9277
PE		 1233 case SO_GET_FILTER:
1234 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1235 if (len < 0)
1236 return len;
1237
1238 goto lenout;
c91f6df2 1239
d59577b6
VB		 1240 case SO_LOCK_FILTER:
1241 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1242 break;
1243
ea02f941
MS		 1244 case SO_BPF_EXTENSIONS:
1245 v.val = bpf_tell_extensions();
1246 break;
1247
7d4c04fc
KJ		 1248 case SO_SELECT_ERR_QUEUE:
1249 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1250 break;
1251
e0d1095a 1252#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1253 case SO_BUSY_POLL:
dafcc438
ET		 1254 v.val = sk->sk_ll_usec;
1255 break;
1256#endif
1257
62748f32
ED		 1258 case SO_MAX_PACING_RATE:
1259 v.val = sk->sk_max_pacing_rate;
1260 break;
1261
2c8c56e1
ED		 1262 case SO_INCOMING_CPU:
1263 v.val = sk->sk_incoming_cpu;
1264 break;
1265
e71a4783 1266 default:
443b5991
YH		 1267 /* We implement the SO_SNDLOWAT etc to not be settable
1268 * (1003.1g 7).
1269 */
e71a4783 1270 return -ENOPROTOOPT;
1da177e4 1271 }
e71a4783 1272
1da177e4
LT		 1273 if (len > lv)
1274 len = lv;
1275 if (copy_to_user(optval, &v, len))
1276 return -EFAULT;
1277lenout:
4ec93edb
YH		 1278 if (put_user(len, optlen))
1279 return -EFAULT;
1280 return 0;
1da177e4
LT		 1281}
1282
a5b5bb9a
IM		 1283/*
1284 * Initialize an sk_lock.
1285 *
1286 * (We also register the sk_lock with the lock validator.)
1287 */
b6f99a21 1288static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1289{
ed07536e
PZ		 1290 sock_lock_init_class_and_name(sk,
1291 af_family_slock_key_strings[sk->sk_family],
1292 af_family_slock_keys + sk->sk_family,
1293 af_family_key_strings[sk->sk_family],
1294 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1295}
1296
4dc6dc71
ED		 1297/*
1298 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1299 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1300 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1301 */
f1a6c4da
PE		 1302static void sock_copy(struct sock *nsk, const struct sock *osk)
1303{
1304#ifdef CONFIG_SECURITY_NETWORK
1305 void *sptr = nsk->sk_security;
1306#endif
68835aba
ED		 1307 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1308
1309 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1310 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1311
f1a6c4da
PE		 1312#ifdef CONFIG_SECURITY_NETWORK
1313 nsk->sk_security = sptr;
1314 security_sk_clone(osk, nsk);
1315#endif
1316}
1317
fcbdf09d
OP		 1318void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1319{
1320 unsigned long nulls1, nulls2;
1321
1322 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1323 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1324 if (nulls1 > nulls2)
1325 swap(nulls1, nulls2);
1326
1327 if (nulls1 != 0)
1328 memset((char *)sk, 0, nulls1);
1329 memset((char *)sk + nulls1 + sizeof(void *), 0,
1330 nulls2 - nulls1 - sizeof(void *));
1331 memset((char *)sk + nulls2 + sizeof(void *), 0,
1332 size - nulls2 - sizeof(void *));
1333}
1334EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1335
2e4afe7b
PE		 1336static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1337 int family)
c308c1b2
PE		 1338{
1339 struct sock *sk;
1340 struct kmem_cache *slab;
1341
1342 slab = prot->slab;
e912b114
ED		 1343 if (slab != NULL) {
1344 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1345 if (!sk)
1346 return sk;
1347 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1348 if (prot->clear_sk)
1349 prot->clear_sk(sk, prot->obj_size);
1350 else
1351 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1352 }
fcbdf09d 1353 } else
c308c1b2
PE		 1354 sk = kmalloc(prot->obj_size, priority);
1355
2e4afe7b 1356 if (sk != NULL) {
a98b65a3
VN		 1357 kmemcheck_annotate_bitfield(sk, flags);
1358
2e4afe7b
PE		 1359 if (security_sk_alloc(sk, family, priority))
1360 goto out_free;
1361
1362 if (!try_module_get(prot->owner))
1363 goto out_free_sec;
e022f0b4 1364 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1365 }
1366
c308c1b2 1367 return sk;
2e4afe7b
PE		 1368
1369out_free_sec:
1370 security_sk_free(sk);
1371out_free:
1372 if (slab != NULL)
1373 kmem_cache_free(slab, sk);
1374 else
1375 kfree(sk);
1376 return NULL;
c308c1b2
PE		 1377}
1378
1379static void sk_prot_free(struct proto *prot, struct sock *sk)
1380{
1381 struct kmem_cache *slab;
2e4afe7b 1382 struct module *owner;
c308c1b2 1383
2e4afe7b 1384 owner = prot->owner;
c308c1b2 1385 slab = prot->slab;
2e4afe7b 1386
bd1060a1 1387 cgroup_sk_free(&sk->sk_cgrp_data);
2e4afe7b 1388 security_sk_free(sk);
c308c1b2
PE		 1389 if (slab != NULL)
1390 kmem_cache_free(slab, sk);
1391 else
1392 kfree(sk);
2e4afe7b 1393 module_put(owner);
c308c1b2
PE		 1394}
1395
1da177e4
LT		 1396/**
1397 * sk_alloc - All socket objects are allocated here
c4ea43c5 1398 * @net: the applicable net namespace
4dc3b16b
PP		 1399 * @family: protocol family
1400 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1401 * @prot: struct proto associated with this new sock instance
11aa9c28 1402 * @kern: is this to be a kernel socket?
1da177e4 1403 */
1b8d7ae4 1404struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
11aa9c28 1405 struct proto *prot, int kern)
1da177e4 1406{
c308c1b2 1407 struct sock *sk;
1da177e4 1408
154adbc8 1409 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1410 if (sk) {
154adbc8
PE		 1411 sk->sk_family = family;
1412 /*
1413 * See comment in struct sock definition to understand
1414 * why we need sk_prot_creator -acme
1415 */
1416 sk->sk_prot = sk->sk_prot_creator = prot;
1417 sock_lock_init(sk);
26abe143
EB		 1418 sk->sk_net_refcnt = kern ? 0 : 1;
1419 if (likely(sk->sk_net_refcnt))
1420 get_net(net);
1421 sock_net_set(sk, net);
d66ee058 1422 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1423
d979a39d 1424 cgroup_sk_alloc(&sk->sk_cgrp_data);
2a56a1fe
TH		 1425 sock_update_classid(&sk->sk_cgrp_data);
1426 sock_update_netprioidx(&sk->sk_cgrp_data);
1da177e4 1427 }
a79af59e 1428
2e4afe7b 1429 return sk;
1da177e4 1430}
2a91525c 1431EXPORT_SYMBOL(sk_alloc);
1da177e4 1432
a4298e45
ED		 1433/* Sockets having SOCK_RCU_FREE will call this function after one RCU
1434 * grace period. This is the case for UDP sockets and TCP listeners.
1435 */
1436static void __sk_destruct(struct rcu_head *head)
1da177e4 1437{
a4298e45 1438 struct sock *sk = container_of(head, struct sock, sk_rcu);
1da177e4 1439 struct sk_filter *filter;
1da177e4
LT		 1440
1441 if (sk->sk_destruct)
1442 sk->sk_destruct(sk);
1443
a898def2
PM		 1444 filter = rcu_dereference_check(sk->sk_filter,
1445 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1446 if (filter) {
309dd5fc 1447 sk_filter_uncharge(sk, filter);
a9b3cd7f 1448 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4 1449 }
538950a1
CG		 1450 if (rcu_access_pointer(sk->sk_reuseport_cb))
1451 reuseport_detach_sock(sk);
1da177e4 1452
08e29af3 1453 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1454
1455 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1456 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1457 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1458
109f6e39
EB		 1459 if (sk->sk_peer_cred)
1460 put_cred(sk->sk_peer_cred);
1461 put_pid(sk->sk_peer_pid);
26abe143
EB		 1462 if (likely(sk->sk_net_refcnt))
1463 put_net(sock_net(sk));
c308c1b2 1464 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1465}
2b85a34e 1466
a4298e45
ED		 1467void sk_destruct(struct sock *sk)
1468{
1469 if (sock_flag(sk, SOCK_RCU_FREE))
1470 call_rcu(&sk->sk_rcu, __sk_destruct);
1471 else
1472 __sk_destruct(&sk->sk_rcu);
1473}
1474
eb4cb008
CG		 1475static void __sk_free(struct sock *sk)
1476{
b922622e 1477 if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt))
eb4cb008
CG		 1478 sock_diag_broadcast_destroy(sk);
1479 else
1480 sk_destruct(sk);
1481}
1482
2b85a34e
ED		 1483void sk_free(struct sock *sk)
1484{
1485 /*
25985edc 1486 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1487 * some packets are still in some tx queue.
1488 * If not null, sock_wfree() will call __sk_free(sk) later
1489 */
1490 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1491 __sk_free(sk);
1492}
2a91525c 1493EXPORT_SYMBOL(sk_free);
1da177e4 1494
e56c57d0
ED		 1495/**
1496 * sk_clone_lock - clone a socket, and lock its clone
1497 * @sk: the socket to clone
1498 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1499 *
1500 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1501 */
1502struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1503{
8fd1d178 1504 struct sock *newsk;
278571ba 1505 bool is_charged = true;
87d11ceb 1506
8fd1d178 1507 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1508 if (newsk != NULL) {
1509 struct sk_filter *filter;
1510
892c141e 1511 sock_copy(newsk, sk);
87d11ceb
ACM		 1512
1513 /* SANITY */
8a681736
SV		 1514 if (likely(newsk->sk_net_refcnt))
1515 get_net(sock_net(newsk));
87d11ceb
ACM		 1516 sk_node_init(&newsk->sk_node);
1517 sock_lock_init(newsk);
1518 bh_lock_sock(newsk);
fa438ccf 1519 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1520 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1521
1522 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1523 /*
1524 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1525 */
1526 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1527 atomic_set(&newsk->sk_omem_alloc, 0);
1528 skb_queue_head_init(&newsk->sk_receive_queue);
1529 skb_queue_head_init(&newsk->sk_write_queue);
1530
87d11ceb 1531 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1532 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1533 af_callback_keys + newsk->sk_family,
1534 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1535
1536 newsk->sk_dst_cache = NULL;
1537 newsk->sk_wmem_queued = 0;
1538 newsk->sk_forward_alloc = 0;
9caad864 1539 atomic_set(&newsk->sk_drops, 0);
87d11ceb 1540 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1541 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1542
1543 sock_reset_flag(newsk, SOCK_DONE);
1544 skb_queue_head_init(&newsk->sk_error_queue);
1545
0d7da9dd 1546 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb 1547 if (filter != NULL)
278571ba
AS		 1548 /* though it's an empty new sock, the charging may fail
1549 * if sysctl_optmem_max was changed between creation of
1550 * original socket and cloning
1551 */
1552 is_charged = sk_filter_charge(newsk, filter);
87d11ceb 1553
d188ba86 1554 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
87d11ceb
ACM		 1555 /* It is still raw copy of parent, so invalidate
1556 * destructor and make plain sk_free() */
1557 newsk->sk_destruct = NULL;
b0691c8e 1558 bh_unlock_sock(newsk);
87d11ceb
ACM		 1559 sk_free(newsk);
1560 newsk = NULL;
1561 goto out;
1562 }
fa463497 1563 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
87d11ceb
ACM		 1564
1565 newsk->sk_err = 0;
1566 newsk->sk_priority = 0;
2c8c56e1 1567 newsk->sk_incoming_cpu = raw_smp_processor_id();
33cf7c90 1568 atomic64_set(&newsk->sk_cookie, 0);
d979a39d
JW		 1569
1570 cgroup_sk_alloc(&newsk->sk_cgrp_data);
1571
4dc6dc71
ED		 1572 /*
1573 * Before updating sk_refcnt, we must commit prior changes to memory
1574 * (Documentation/RCU/rculist_nulls.txt for details)
1575 */
1576 smp_wmb();
87d11ceb
ACM		 1577 atomic_set(&newsk->sk_refcnt, 2);
1578
1579 /*
1580 * Increment the counter in the same struct proto as the master
1581 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1582 * is the same as sk->sk_prot->socks, as this field was copied
1583 * with memcpy).
1584 *
1585 * This _changes_ the previous behaviour, where
1586 * tcp_create_openreq_child always was incrementing the
1587 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1588 * to be taken into account in all callers. -acme
1589 */
1590 sk_refcnt_debug_inc(newsk);
972692e0 1591 sk_set_socket(newsk, NULL);
43815482 1592 newsk->sk_wq = NULL;
87d11ceb 1593
baac50bb 1594 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
3d596f7b 1595 sock_update_memcg(newsk);
f3f511e1 1596
87d11ceb 1597 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1598 sk_sockets_allocated_inc(newsk);
704da560 1599
080a270f
HFS		 1600 if (sock_needs_netstamp(sk) &&
1601 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1602 net_enable_timestamp();
87d11ceb
ACM		 1603 }
1604out:
1605 return newsk;
1606}
e56c57d0 1607EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1608
9958089a
AK		 1609void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1610{
d6a4e26a
ED		 1611 u32 max_segs = 1;
1612
6bd4f355 1613 sk_dst_set(sk, dst);
9958089a
AK		 1614 sk->sk_route_caps = dst->dev->features;
1615 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1616 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1617 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1618 if (sk_can_gso(sk)) {
82cc1a7a 1619 if (dst->header_len) {
9958089a 1620 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1621 } else {
9958089a 1622 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1623 sk->sk_gso_max_size = dst->dev->gso_max_size;
d6a4e26a 1624 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
82cc1a7a 1625 }
9958089a 1626 }
d6a4e26a 1627 sk->sk_gso_max_segs = max_segs;
9958089a
AK		 1628}
1629EXPORT_SYMBOL_GPL(sk_setup_caps);
1630
1da177e4
LT		 1631/*
1632 * Simple resource managers for sockets.
1633 */
1634
1635
4ec93edb
YH		 1636/*
1637 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1638 */
1639void sock_wfree(struct sk_buff *skb)
1640{
1641 struct sock *sk = skb->sk;
d99927f4 1642 unsigned int len = skb->truesize;
1da177e4 1643
d99927f4
ED		 1644 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1645 /*
1646 * Keep a reference on sk_wmem_alloc, this will be released
1647 * after sk_write_space() call
1648 */
1649 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1650 sk->sk_write_space(sk);
d99927f4
ED		 1651 len = 1;
1652 }
2b85a34e 1653 /*
d99927f4
ED		 1654 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1655 * could not do because of in-flight packets
2b85a34e 1656 */
d99927f4 1657 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1658 __sk_free(sk);
1da177e4 1659}
2a91525c 1660EXPORT_SYMBOL(sock_wfree);
1da177e4 1661
1d2077ac
ED		 1662/* This variant of sock_wfree() is used by TCP,
1663 * since it sets SOCK_USE_WRITE_QUEUE.
1664 */
1665void __sock_wfree(struct sk_buff *skb)
1666{
1667 struct sock *sk = skb->sk;
1668
1669 if (atomic_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
1670 __sk_free(sk);
1671}
1672
9e17f8a4
ED		 1673void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1674{
1675 skb_orphan(skb);
1676 skb->sk = sk;
1677#ifdef CONFIG_INET
1678 if (unlikely(!sk_fullsock(sk))) {
1679 skb->destructor = sock_edemux;
1680 sock_hold(sk);
1681 return;
1682 }
1683#endif
1684 skb->destructor = sock_wfree;
1685 skb_set_hash_from_sk(skb, sk);
1686 /*
1687 * We used to take a refcount on sk, but following operation
1688 * is enough to guarantee sk_free() wont free this sock until
1689 * all in-flight packets are completed
1690 */
1691 atomic_add(skb->truesize, &sk->sk_wmem_alloc);
1692}
1693EXPORT_SYMBOL(skb_set_owner_w);
1694
1d2077ac
ED		 1695/* This helper is used by netem, as it can hold packets in its
1696 * delay queue. We want to allow the owner socket to send more
1697 * packets, as if they were already TX completed by a typical driver.
1698 * But we also want to keep skb->sk set because some packet schedulers
1699 * rely on it (sch_fq for example). So we set skb->truesize to a small
1700 * amount (1) and decrease sk_wmem_alloc accordingly.
1701 */
f2f872f9
ED		 1702void skb_orphan_partial(struct sk_buff *skb)
1703{
1d2077ac
ED		 1704 /* If this skb is a TCP pure ACK or already went here,
1705 * we have nothing to do. 2 is already a very small truesize.
1706 */
1707 if (skb->truesize <= 2)
1708 return;
1709
f2f872f9
ED		 1710 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1711 * so we do not completely orphan skb, but transfert all
1712 * accounted bytes but one, to avoid unexpected reorders.
1713 */
1714 if (skb->destructor == sock_wfree
1715#ifdef CONFIG_INET
1716 || skb->destructor == tcp_wfree
1717#endif
1718 ) {
1719 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1720 skb->truesize = 1;
1721 } else {
1722 skb_orphan(skb);
1723 }
1724}
1725EXPORT_SYMBOL(skb_orphan_partial);
1726
4ec93edb
YH		 1727/*
1728 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1729 */
1730void sock_rfree(struct sk_buff *skb)
1731{
1732 struct sock *sk = skb->sk;
d361fd59 1733 unsigned int len = skb->truesize;
1da177e4 1734
d361fd59
ED		 1735 atomic_sub(len, &sk->sk_rmem_alloc);
1736 sk_mem_uncharge(sk, len);
1da177e4 1737}
2a91525c 1738EXPORT_SYMBOL(sock_rfree);
1da177e4 1739
7768eed8
OH		 1740/*
1741 * Buffer destructor for skbs that are not used directly in read or write
1742 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1743 */
62bccb8c
AD		 1744void sock_efree(struct sk_buff *skb)
1745{
1746 sock_put(skb->sk);
1747}
1748EXPORT_SYMBOL(sock_efree);
1749
976d0201 1750kuid_t sock_i_uid(struct sock *sk)
1da177e4 1751{
976d0201 1752 kuid_t uid;
1da177e4 1753
f064af1e 1754 read_lock_bh(&sk->sk_callback_lock);
976d0201 1755 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1756 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1757 return uid;
1758}
2a91525c 1759EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1760
1761unsigned long sock_i_ino(struct sock *sk)
1762{
1763 unsigned long ino;
1764
f064af1e 1765 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1766 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1767 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1768 return ino;
1769}
2a91525c 1770EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1771
1772/*
1773 * Allocate a skb from the socket's send buffer.
1774 */
86a76caf 1775struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1776 gfp_t priority)
1da177e4
LT		 1777{
1778 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1779 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1780 if (skb) {
1781 skb_set_owner_w(skb, sk);
1782 return skb;
1783 }
1784 }
1785 return NULL;
1786}
2a91525c 1787EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1788
4ec93edb 1789/*
1da177e4 1790 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1791 */
dd0fc66f 1792void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1793{
95c96174 1794 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1795 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1796 void *mem;
1797 /* First do the add, to avoid the race if kmalloc
4ec93edb 1798 * might sleep.
1da177e4
LT		 1799 */
1800 atomic_add(size, &sk->sk_omem_alloc);
1801 mem = kmalloc(size, priority);
1802 if (mem)
1803 return mem;
1804 atomic_sub(size, &sk->sk_omem_alloc);
1805 }
1806 return NULL;
1807}
2a91525c 1808EXPORT_SYMBOL(sock_kmalloc);
1da177e4 1809
79e88659
DB		 1810/* Free an option memory block. Note, we actually want the inline
1811 * here as this allows gcc to detect the nullify and fold away the
1812 * condition entirely.
1da177e4 1813 */
79e88659
DB		 1814static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1815 const bool nullify)
1da177e4 1816{
e53da5fb
DM		 1817 if (WARN_ON_ONCE(!mem))
1818 return;
79e88659
DB		 1819 if (nullify)
1820 kzfree(mem);
1821 else
1822 kfree(mem);
1da177e4
LT		 1823 atomic_sub(size, &sk->sk_omem_alloc);
1824}
79e88659
DB		 1825
1826void sock_kfree_s(struct sock *sk, void *mem, int size)
1827{
1828 __sock_kfree_s(sk, mem, size, false);
1829}
2a91525c 1830EXPORT_SYMBOL(sock_kfree_s);
1da177e4 1831
79e88659
DB		 1832void sock_kzfree_s(struct sock *sk, void *mem, int size)
1833{
1834 __sock_kfree_s(sk, mem, size, true);
1835}
1836EXPORT_SYMBOL(sock_kzfree_s);
1837
1da177e4
LT		 1838/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1839 I think, these locks should be removed for datagram sockets.
1840 */
2a91525c 1841static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1842{
1843 DEFINE_WAIT(wait);
1844
9cd3e072 1845 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1da177e4
LT		 1846 for (;;) {
1847 if (!timeo)
1848 break;
1849 if (signal_pending(current))
1850 break;
1851 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1852 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1853 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1854 break;
1855 if (sk->sk_shutdown & SEND_SHUTDOWN)
1856 break;
1857 if (sk->sk_err)
1858 break;
1859 timeo = schedule_timeout(timeo);
1860 }
aa395145 1861 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1862 return timeo;
1863}
1864
1865
1866/*
1867 * Generic send/receive buffer handlers
1868 */
1869
4cc7f68d
HX		 1870struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1871 unsigned long data_len, int noblock,
28d64271 1872 int *errcode, int max_page_order)
1da177e4 1873{
2e4e4410 1874 struct sk_buff *skb;
1da177e4
LT		 1875 long timeo;
1876 int err;
1877
1da177e4 1878 timeo = sock_sndtimeo(sk, noblock);
2e4e4410 1879 for (;;) {
1da177e4
LT		 1880 err = sock_error(sk);
1881 if (err != 0)
1882 goto failure;
1883
1884 err = -EPIPE;
1885 if (sk->sk_shutdown & SEND_SHUTDOWN)
1886 goto failure;
1887
2e4e4410
ED		 1888 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
1889 break;
28d64271 1890
9cd3e072 1891 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2e4e4410
ED		 1892 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1893 err = -EAGAIN;
1894 if (!timeo)
1da177e4 1895 goto failure;
2e4e4410
ED		 1896 if (signal_pending(current))
1897 goto interrupted;
1898 timeo = sock_wait_for_wmem(sk, timeo);
1da177e4 1899 }
2e4e4410
ED		 1900 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
1901 errcode, sk->sk_allocation);
1902 if (skb)
1903 skb_set_owner_w(skb, sk);
1da177e4
LT		 1904 return skb;
1905
1906interrupted:
1907 err = sock_intr_errno(timeo);
1908failure:
1909 *errcode = err;
1910 return NULL;
1911}
4cc7f68d 1912EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1913
4ec93edb 1914struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1915 int noblock, int *errcode)
1916{
28d64271 1917 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1918}
2a91525c 1919EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1920
39771b12
WB		 1921int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
1922 struct sockcm_cookie *sockc)
1923{
3dd17e63
SHY		 1924 u32 tsflags;
1925
39771b12
WB		 1926 switch (cmsg->cmsg_type) {
1927 case SO_MARK:
1928 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1929 return -EPERM;
1930 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
1931 return -EINVAL;
1932 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
1933 break;
3dd17e63
SHY		 1934 case SO_TIMESTAMPING:
1935 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
1936 return -EINVAL;
1937
1938 tsflags = *(u32 *)CMSG_DATA(cmsg);
1939 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
1940 return -EINVAL;
1941
1942 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
1943 sockc->tsflags |= tsflags;
1944 break;
779f1ede
SHY		 1945 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
1946 case SCM_RIGHTS:
1947 case SCM_CREDENTIALS:
1948 break;
39771b12
WB		 1949 default:
1950 return -EINVAL;
1951 }
1952 return 0;
1953}
1954EXPORT_SYMBOL(__sock_cmsg_send);
1955
f28ea365
EJ		 1956int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
1957 struct sockcm_cookie *sockc)
1958{
1959 struct cmsghdr *cmsg;
39771b12 1960 int ret;
f28ea365
EJ		 1961
1962 for_each_cmsghdr(cmsg, msg) {
1963 if (!CMSG_OK(msg, cmsg))
1964 return -EINVAL;
1965 if (cmsg->cmsg_level != SOL_SOCKET)
1966 continue;
39771b12
WB		 1967 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
1968 if (ret)
1969 return ret;
f28ea365
EJ		 1970 }
1971 return 0;
1972}
1973EXPORT_SYMBOL(sock_cmsg_send);
1974
5640f768
ED		 1975/* On 32bit arches, an skb frag is limited to 2^15 */
1976#define SKB_FRAG_PAGE_ORDER get_order(32768)
1977
400dfd3a
ED		 1978/**
1979 * skb_page_frag_refill - check that a page_frag contains enough room
1980 * @sz: minimum size of the fragment we want to get
1981 * @pfrag: pointer to page_frag
82d5e2b8 1982 * @gfp: priority for memory allocation
400dfd3a
ED		 1983 *
1984 * Note: While this allocator tries to use high order pages, there is
1985 * no guarantee that allocations succeed. Therefore, @sz MUST be
1986 * less or equal than PAGE_SIZE.
1987 */
d9b2938a 1988bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 1989{
5640f768 1990 if (pfrag->page) {
fe896d18 1991 if (page_ref_count(pfrag->page) == 1) {
5640f768
ED		 1992 pfrag->offset = 0;
1993 return true;
1994 }
400dfd3a 1995 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1996 return true;
1997 put_page(pfrag->page);
1998 }
1999
d9b2938a
ED		 2000 pfrag->offset = 0;
2001 if (SKB_FRAG_PAGE_ORDER) {
d0164adc
MG		 2002 /* Avoid direct reclaim but allow kswapd to wake */
2003 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
2004 __GFP_COMP | __GFP_NOWARN |
2005 __GFP_NORETRY,
d9b2938a 2006 SKB_FRAG_PAGE_ORDER);
5640f768 2007 if (likely(pfrag->page)) {
d9b2938a 2008 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 2009 return true;
2010 }
d9b2938a
ED		 2011 }
2012 pfrag->page = alloc_page(gfp);
2013 if (likely(pfrag->page)) {
2014 pfrag->size = PAGE_SIZE;
2015 return true;
2016 }
400dfd3a
ED		 2017 return false;
2018}
2019EXPORT_SYMBOL(skb_page_frag_refill);
2020
2021bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2022{
2023 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2024 return true;
2025
5640f768
ED		 2026 sk_enter_memory_pressure(sk);
2027 sk_stream_moderate_sndbuf(sk);
2028 return false;
2029}
2030EXPORT_SYMBOL(sk_page_frag_refill);
2031
1da177e4 2032static void __lock_sock(struct sock *sk)
f39234d6
NK		 2033 __releases(&sk->sk_lock.slock)
2034 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 2035{
2036 DEFINE_WAIT(wait);
2037
e71a4783 2038 for (;;) {
1da177e4
LT		 2039 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2040 TASK_UNINTERRUPTIBLE);
2041 spin_unlock_bh(&sk->sk_lock.slock);
2042 schedule();
2043 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 2044 if (!sock_owned_by_user(sk))
1da177e4
LT		 2045 break;
2046 }
2047 finish_wait(&sk->sk_lock.wq, &wait);
2048}
2049
2050static void __release_sock(struct sock *sk)
f39234d6
NK		 2051 __releases(&sk->sk_lock.slock)
2052 __acquires(&sk->sk_lock.slock)
1da177e4 2053{
5413d1ba 2054 struct sk_buff *skb, *next;
1da177e4 2055
5413d1ba 2056 while ((skb = sk->sk_backlog.head) != NULL) {
1da177e4 2057 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1da177e4 2058
5413d1ba 2059 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4 2060
5413d1ba
ED		 2061 do {
2062 next = skb->next;
e4cbb02a 2063 prefetch(next);
7fee226a 2064 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 2065 skb->next = NULL;
c57943a1 2066 sk_backlog_rcv(sk, skb);
1da177e4 2067
5413d1ba 2068 cond_resched();
1da177e4
LT		 2069
2070 skb = next;
2071 } while (skb != NULL);
2072
5413d1ba
ED		 2073 spin_lock_bh(&sk->sk_lock.slock);
2074 }
8eae939f
ZY		 2075
2076 /*
2077 * Doing the zeroing here guarantee we can not loop forever
2078 * while a wild producer attempts to flood us.
2079 */
2080 sk->sk_backlog.len = 0;
1da177e4
LT		 2081}
2082
d41a69f1
ED		 2083void __sk_flush_backlog(struct sock *sk)
2084{
2085 spin_lock_bh(&sk->sk_lock.slock);
2086 __release_sock(sk);
2087 spin_unlock_bh(&sk->sk_lock.slock);
2088}
2089
1da177e4
LT		 2090/**
2091 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 2092 * @sk: sock to wait on
2093 * @timeo: for how long
dfbafc99 2094 * @skb: last skb seen on sk_receive_queue
1da177e4
LT		 2095 *
2096 * Now socket state including sk->sk_err is changed only under lock,
2097 * hence we may omit checks after joining wait queue.
2098 * We check receive queue before schedule() only as optimization;
2099 * it is very likely that release_sock() added new data.
2100 */
dfbafc99 2101int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
1da177e4
LT		 2102{
2103 int rc;
2104 DEFINE_WAIT(wait);
2105
aa395145 2106 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9cd3e072 2107 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
dfbafc99 2108 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb);
9cd3e072 2109 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
aa395145 2110 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 2111 return rc;
2112}
1da177e4
LT		 2113EXPORT_SYMBOL(sk_wait_data);
2114
3ab224be
HA		 2115/**
2116 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2117 * @sk: socket
2118 * @size: memory size to allocate
2119 * @kind: allocation type
2120 *
2121 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2122 * rmem allocation. This function assumes that protocols which have
2123 * memory_pressure use sk_wmem_queued as write buffer accounting.
2124 */
2125int __sk_mem_schedule(struct sock *sk, int size, int kind)
2126{
2127 struct proto *prot = sk->sk_prot;
2128 int amt = sk_mem_pages(size);
8d987e5c 2129 long allocated;
3ab224be
HA		 2130
2131 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 2132
e805605c
JW		 2133 allocated = sk_memory_allocated_add(sk, amt);
2134
baac50bb
JW		 2135 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2136 !mem_cgroup_charge_skmem(sk->sk_memcg, amt))
e805605c 2137 goto suppress_allocation;
3ab224be
HA		 2138
2139 /* Under limit. */
e805605c 2140 if (allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2141 sk_leave_memory_pressure(sk);
3ab224be
HA		 2142 return 1;
2143 }
2144
e805605c
JW		 2145 /* Under pressure. */
2146 if (allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2147 sk_enter_memory_pressure(sk);
3ab224be 2148
e805605c
JW		 2149 /* Over hard limit. */
2150 if (allocated > sk_prot_mem_limits(sk, 2))
3ab224be
HA		 2151 goto suppress_allocation;
2152
2153 /* guarantee minimum buffer size under pressure */
2154 if (kind == SK_MEM_RECV) {
2155 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2156 return 1;
180d8cd9 2157
3ab224be
HA		 2158 } else { /* SK_MEM_SEND */
2159 if (sk->sk_type == SOCK_STREAM) {
2160 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2161 return 1;
2162 } else if (atomic_read(&sk->sk_wmem_alloc) <
2163 prot->sysctl_wmem[0])
2164 return 1;
2165 }
2166
180d8cd9 2167 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2168 int alloc;
2169
180d8cd9 2170 if (!sk_under_memory_pressure(sk))
1748376b 2171 return 1;
180d8cd9
GC		 2172 alloc = sk_sockets_allocated_read_positive(sk);
2173 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2174 sk_mem_pages(sk->sk_wmem_queued +
2175 atomic_read(&sk->sk_rmem_alloc) +
2176 sk->sk_forward_alloc))
2177 return 1;
2178 }
2179
2180suppress_allocation:
2181
2182 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2183 sk_stream_moderate_sndbuf(sk);
2184
2185 /* Fail only if socket is _under_ its sndbuf.
2186 * In this case we cannot block, so that we have to fail.
2187 */
2188 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2189 return 1;
2190 }
2191
3847ce32
SM		 2192 trace_sock_exceed_buf_limit(sk, prot, allocated);
2193
3ab224be
HA		 2194 /* Alas. Undo changes. */
2195 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2196
0e90b31f 2197 sk_memory_allocated_sub(sk, amt);
180d8cd9 2198
baac50bb
JW		 2199 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2200 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
e805605c 2201
3ab224be
HA		 2202 return 0;
2203}
3ab224be
HA		 2204EXPORT_SYMBOL(__sk_mem_schedule);
2205
2206/**
69dba9bb 2207 * __sk_mem_reclaim - reclaim memory_allocated
3ab224be 2208 * @sk: socket
1a24e04e 2209 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
3ab224be 2210 */
1a24e04e 2211void __sk_mem_reclaim(struct sock *sk, int amount)
3ab224be 2212{
1a24e04e
ED		 2213 amount >>= SK_MEM_QUANTUM_SHIFT;
2214 sk_memory_allocated_sub(sk, amount);
2215 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
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}
3ab224be
HA		 2224EXPORT_SYMBOL(__sk_mem_reclaim);
2225
627d2d6b 2226int sk_set_peek_off(struct sock *sk, int val)
2227{
2228 if (val < 0)
2229 return -EINVAL;
2230
2231 sk->sk_peek_off = val;
2232 return 0;
2233}
2234EXPORT_SYMBOL_GPL(sk_set_peek_off);
3ab224be 2235
1da177e4
LT		 2236/*
2237 * Set of default routines for initialising struct proto_ops when
2238 * the protocol does not support a particular function. In certain
2239 * cases where it makes no sense for a protocol to have a "do nothing"
2240 * function, some default processing is provided.
2241 */
2242
2243int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2244{
2245 return -EOPNOTSUPP;
2246}
2a91525c 2247EXPORT_SYMBOL(sock_no_bind);
1da177e4 2248
4ec93edb 2249int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2250 int len, int flags)
2251{
2252 return -EOPNOTSUPP;
2253}
2a91525c 2254EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2255
2256int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2257{
2258 return -EOPNOTSUPP;
2259}
2a91525c 2260EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2261
2262int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2263{
2264 return -EOPNOTSUPP;
2265}
2a91525c 2266EXPORT_SYMBOL(sock_no_accept);
1da177e4 2267
4ec93edb 2268int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2269 int *len, int peer)
2270{
2271 return -EOPNOTSUPP;
2272}
2a91525c 2273EXPORT_SYMBOL(sock_no_getname);
1da177e4 2274
2a91525c 2275unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2276{
2277 return 0;
2278}
2a91525c 2279EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2280
2281int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2282{
2283 return -EOPNOTSUPP;
2284}
2a91525c 2285EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2286
2287int sock_no_listen(struct socket *sock, int backlog)
2288{
2289 return -EOPNOTSUPP;
2290}
2a91525c 2291EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2292
2293int sock_no_shutdown(struct socket *sock, int how)
2294{
2295 return -EOPNOTSUPP;
2296}
2a91525c 2297EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2298
2299int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2300 char __user *optval, unsigned int optlen)
1da177e4
LT		 2301{
2302 return -EOPNOTSUPP;
2303}
2a91525c 2304EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2305
2306int sock_no_getsockopt(struct socket *sock, int level, int optname,
2307 char __user *optval, int __user *optlen)
2308{
2309 return -EOPNOTSUPP;
2310}
2a91525c 2311EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4 2312
1b784140 2313int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
1da177e4
LT		 2314{
2315 return -EOPNOTSUPP;
2316}
2a91525c 2317EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4 2318
1b784140
YX		 2319int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2320 int flags)
1da177e4
LT		 2321{
2322 return -EOPNOTSUPP;
2323}
2a91525c 2324EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2325
2326int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2327{
2328 /* Mirror missing mmap method error code */
2329 return -ENODEV;
2330}
2a91525c 2331EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2332
2333ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2334{
2335 ssize_t res;
2336 struct msghdr msg = {.msg_flags = flags};
2337 struct kvec iov;
2338 char *kaddr = kmap(page);
2339 iov.iov_base = kaddr + offset;
2340 iov.iov_len = size;
2341 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2342 kunmap(page);
2343 return res;
2344}
2a91525c 2345EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2346
2347/*
2348 * Default Socket Callbacks
2349 */
2350
2351static void sock_def_wakeup(struct sock *sk)
2352{
43815482
ED		 2353 struct socket_wq *wq;
2354
2355 rcu_read_lock();
2356 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2357 if (skwq_has_sleeper(wq))
43815482
ED		 2358 wake_up_interruptible_all(&wq->wait);
2359 rcu_read_unlock();
1da177e4
LT		 2360}
2361
2362static void sock_def_error_report(struct sock *sk)
2363{
43815482
ED		 2364 struct socket_wq *wq;
2365
2366 rcu_read_lock();
2367 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2368 if (skwq_has_sleeper(wq))
43815482 2369 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2370 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2371 rcu_read_unlock();
1da177e4
LT		 2372}
2373
676d2369 2374static void sock_def_readable(struct sock *sk)
1da177e4 2375{
43815482
ED		 2376 struct socket_wq *wq;
2377
2378 rcu_read_lock();
2379 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2380 if (skwq_has_sleeper(wq))
2c6607c6 2381 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2382 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2383 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2384 rcu_read_unlock();
1da177e4
LT		 2385}
2386
2387static void sock_def_write_space(struct sock *sk)
2388{
43815482
ED		 2389 struct socket_wq *wq;
2390
2391 rcu_read_lock();
1da177e4
LT		 2392
2393 /* Do not wake up a writer until he can make "significant"
2394 * progress. --DaveM
2395 */
e71a4783 2396 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482 2397 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2398 if (skwq_has_sleeper(wq))
43815482 2399 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2400 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2401
2402 /* Should agree with poll, otherwise some programs break */
2403 if (sock_writeable(sk))
8d8ad9d7 2404 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2405 }
2406
43815482 2407 rcu_read_unlock();
1da177e4
LT		 2408}
2409
2410static void sock_def_destruct(struct sock *sk)
2411{
1da177e4
LT		 2412}
2413
2414void sk_send_sigurg(struct sock *sk)
2415{
2416 if (sk->sk_socket && sk->sk_socket->file)
2417 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2418 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2419}
2a91525c 2420EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2421
2422void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2423 unsigned long expires)
2424{
2425 if (!mod_timer(timer, expires))
2426 sock_hold(sk);
2427}
1da177e4
LT		 2428EXPORT_SYMBOL(sk_reset_timer);
2429
2430void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2431{
25cc4ae9 2432 if (del_timer(timer))
1da177e4
LT		 2433 __sock_put(sk);
2434}
1da177e4
LT		 2435EXPORT_SYMBOL(sk_stop_timer);
2436
2437void sock_init_data(struct socket *sock, struct sock *sk)
2438{
2439 skb_queue_head_init(&sk->sk_receive_queue);
2440 skb_queue_head_init(&sk->sk_write_queue);
2441 skb_queue_head_init(&sk->sk_error_queue);
2442
2443 sk->sk_send_head = NULL;
2444
2445 init_timer(&sk->sk_timer);
4ec93edb 2446
1da177e4
LT		 2447 sk->sk_allocation = GFP_KERNEL;
2448 sk->sk_rcvbuf = sysctl_rmem_default;
2449 sk->sk_sndbuf = sysctl_wmem_default;
2450 sk->sk_state = TCP_CLOSE;
972692e0 2451 sk_set_socket(sk, sock);
1da177e4
LT		 2452
2453 sock_set_flag(sk, SOCK_ZAPPED);
2454
e71a4783 2455 if (sock) {
1da177e4 2456 sk->sk_type = sock->type;
43815482 2457 sk->sk_wq = sock->wq;
1da177e4
LT		 2458 sock->sk = sk;
2459 } else
43815482 2460 sk->sk_wq = NULL;
1da177e4 2461
1da177e4 2462 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2463 lockdep_set_class_and_name(&sk->sk_callback_lock,
2464 af_callback_keys + sk->sk_family,
2465 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2466
2467 sk->sk_state_change = sock_def_wakeup;
2468 sk->sk_data_ready = sock_def_readable;
2469 sk->sk_write_space = sock_def_write_space;
2470 sk->sk_error_report = sock_def_error_report;
2471 sk->sk_destruct = sock_def_destruct;
2472
5640f768
ED		 2473 sk->sk_frag.page = NULL;
2474 sk->sk_frag.offset = 0;
ef64a54f 2475 sk->sk_peek_off = -1;
1da177e4 2476
109f6e39
EB		 2477 sk->sk_peer_pid = NULL;
2478 sk->sk_peer_cred = NULL;
1da177e4
LT		 2479 sk->sk_write_pending = 0;
2480 sk->sk_rcvlowat = 1;
2481 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2482 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2483
f37f0afb 2484 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2485
e0d1095a 2486#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2487 sk->sk_napi_id = 0;
64b0dc51 2488 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2489#endif
2490
62748f32 2491 sk->sk_max_pacing_rate = ~0U;
7eec4174 2492 sk->sk_pacing_rate = ~0U;
70da268b 2493 sk->sk_incoming_cpu = -1;
4dc6dc71
ED		 2494 /*
2495 * Before updating sk_refcnt, we must commit prior changes to memory
2496 * (Documentation/RCU/rculist_nulls.txt for details)
2497 */
2498 smp_wmb();
1da177e4 2499 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2500 atomic_set(&sk->sk_drops, 0);
1da177e4 2501}
2a91525c 2502EXPORT_SYMBOL(sock_init_data);
1da177e4 2503
b5606c2d 2504void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2505{
2506 might_sleep();
a5b5bb9a 2507 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2508 if (sk->sk_lock.owned)
1da177e4 2509 __lock_sock(sk);
d2e9117c 2510 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2511 spin_unlock(&sk->sk_lock.slock);
2512 /*
2513 * The sk_lock has mutex_lock() semantics here:
2514 */
fcc70d5f 2515 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2516 local_bh_enable();
1da177e4 2517}
fcc70d5f 2518EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2519
b5606c2d 2520void release_sock(struct sock *sk)
1da177e4 2521{
a5b5bb9a 2522 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2523 if (sk->sk_backlog.tail)
2524 __release_sock(sk);
46d3ceab 2525
c3f9b018
ED		 2526 /* Warning : release_cb() might need to release sk ownership,
2527 * ie call sock_release_ownership(sk) before us.
2528 */
46d3ceab
ED		 2529 if (sk->sk_prot->release_cb)
2530 sk->sk_prot->release_cb(sk);
2531
c3f9b018 2532 sock_release_ownership(sk);
a5b5bb9a
IM		 2533 if (waitqueue_active(&sk->sk_lock.wq))
2534 wake_up(&sk->sk_lock.wq);
2535 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2536}
2537EXPORT_SYMBOL(release_sock);
2538
8a74ad60
ED		 2539/**
2540 * lock_sock_fast - fast version of lock_sock
2541 * @sk: socket
2542 *
2543 * This version should be used for very small section, where process wont block
2544 * return false if fast path is taken
2545 * sk_lock.slock locked, owned = 0, BH disabled
2546 * return true if slow path is taken
2547 * sk_lock.slock unlocked, owned = 1, BH enabled
2548 */
2549bool lock_sock_fast(struct sock *sk)
2550{
2551 might_sleep();
2552 spin_lock_bh(&sk->sk_lock.slock);
2553
2554 if (!sk->sk_lock.owned)
2555 /*
2556 * Note : We must disable BH
2557 */
2558 return false;
2559
2560 __lock_sock(sk);
2561 sk->sk_lock.owned = 1;
2562 spin_unlock(&sk->sk_lock.slock);
2563 /*
2564 * The sk_lock has mutex_lock() semantics here:
2565 */
2566 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2567 local_bh_enable();
2568 return true;
2569}
2570EXPORT_SYMBOL(lock_sock_fast);
2571
1da177e4 2572int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2573{
b7aa0bf7 2574 struct timeval tv;
1da177e4 2575 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2576 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2577 tv = ktime_to_timeval(sk->sk_stamp);
2578 if (tv.tv_sec == -1)
1da177e4 2579 return -ENOENT;
b7aa0bf7
ED		 2580 if (tv.tv_sec == 0) {
2581 sk->sk_stamp = ktime_get_real();
2582 tv = ktime_to_timeval(sk->sk_stamp);
2583 }
2584 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2585}
1da177e4
LT		 2586EXPORT_SYMBOL(sock_get_timestamp);
2587
ae40eb1e
ED		 2588int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2589{
2590 struct timespec ts;
2591 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2592 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2593 ts = ktime_to_timespec(sk->sk_stamp);
2594 if (ts.tv_sec == -1)
2595 return -ENOENT;
2596 if (ts.tv_sec == 0) {
2597 sk->sk_stamp = ktime_get_real();
2598 ts = ktime_to_timespec(sk->sk_stamp);
2599 }
2600 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2601}
2602EXPORT_SYMBOL(sock_get_timestampns);
2603
20d49473 2604void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2605{
20d49473 2606 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2607 unsigned long previous_flags = sk->sk_flags;
2608
20d49473
PO		 2609 sock_set_flag(sk, flag);
2610 /*
2611 * we just set one of the two flags which require net
2612 * time stamping, but time stamping might have been on
2613 * already because of the other one
2614 */
080a270f
HFS		 2615 if (sock_needs_netstamp(sk) &&
2616 !(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2617 net_enable_timestamp();
1da177e4
LT		 2618 }
2619}
1da177e4 2620
cb820f8e
RC		 2621int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2622 int level, int type)
2623{
2624 struct sock_exterr_skb *serr;
364a9e93 2625 struct sk_buff *skb;
cb820f8e
RC		 2626 int copied, err;
2627
2628 err = -EAGAIN;
364a9e93 2629 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 2630 if (skb == NULL)
2631 goto out;
2632
2633 copied = skb->len;
2634 if (copied > len) {
2635 msg->msg_flags |= MSG_TRUNC;
2636 copied = len;
2637 }
51f3d02b 2638 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 2639 if (err)
2640 goto out_free_skb;
2641
2642 sock_recv_timestamp(msg, sk, skb);
2643
2644 serr = SKB_EXT_ERR(skb);
2645 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2646
2647 msg->msg_flags |= MSG_ERRQUEUE;
2648 err = copied;
2649
cb820f8e
RC		 2650out_free_skb:
2651 kfree_skb(skb);
2652out:
2653 return err;
2654}
2655EXPORT_SYMBOL(sock_recv_errqueue);
2656
1da177e4
LT		 2657/*
2658 * Get a socket option on an socket.
2659 *
2660 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2661 * asynchronous errors should be reported by getsockopt. We assume
2662 * this means if you specify SO_ERROR (otherwise whats the point of it).
2663 */
2664int sock_common_getsockopt(struct socket *sock, int level, int optname,
2665 char __user *optval, int __user *optlen)
2666{
2667 struct sock *sk = sock->sk;
2668
2669 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2670}
1da177e4
LT		 2671EXPORT_SYMBOL(sock_common_getsockopt);
2672
3fdadf7d 2673#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2674int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2675 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2676{
2677 struct sock *sk = sock->sk;
2678
1e51f951 2679 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2680 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2681 optval, optlen);
3fdadf7d
DM		 2682 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2683}
2684EXPORT_SYMBOL(compat_sock_common_getsockopt);
2685#endif
2686
1b784140
YX		 2687int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2688 int flags)
1da177e4
LT		 2689{
2690 struct sock *sk = sock->sk;
2691 int addr_len = 0;
2692 int err;
2693
1b784140 2694 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
1da177e4
LT		 2695 flags & ~MSG_DONTWAIT, &addr_len);
2696 if (err >= 0)
2697 msg->msg_namelen = addr_len;
2698 return err;
2699}
1da177e4
LT		 2700EXPORT_SYMBOL(sock_common_recvmsg);
2701
2702/*
2703 * Set socket options on an inet socket.
2704 */
2705int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2706 char __user *optval, unsigned int optlen)
1da177e4
LT		 2707{
2708 struct sock *sk = sock->sk;
2709
2710 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2711}
1da177e4
LT		 2712EXPORT_SYMBOL(sock_common_setsockopt);
2713
3fdadf7d 2714#ifdef CONFIG_COMPAT
543d9cfe 2715int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2716 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2717{
2718 struct sock *sk = sock->sk;
2719
543d9cfe
ACM		 2720 if (sk->sk_prot->compat_setsockopt != NULL)
2721 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2722 optval, optlen);
3fdadf7d
DM		 2723 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2724}
2725EXPORT_SYMBOL(compat_sock_common_setsockopt);
2726#endif
2727
1da177e4
LT		 2728void sk_common_release(struct sock *sk)
2729{
2730 if (sk->sk_prot->destroy)
2731 sk->sk_prot->destroy(sk);
2732
2733 /*
2734 * Observation: when sock_common_release is called, processes have
2735 * no access to socket. But net still has.
2736 * Step one, detach it from networking:
2737 *
2738 * A. Remove from hash tables.
2739 */
2740
2741 sk->sk_prot->unhash(sk);
2742
2743 /*
2744 * In this point socket cannot receive new packets, but it is possible
2745 * that some packets are in flight because some CPU runs receiver and
2746 * did hash table lookup before we unhashed socket. They will achieve
2747 * receive queue and will be purged by socket destructor.
2748 *
2749 * Also we still have packets pending on receive queue and probably,
2750 * our own packets waiting in device queues. sock_destroy will drain
2751 * receive queue, but transmitted packets will delay socket destruction
2752 * until the last reference will be released.
2753 */
2754
2755 sock_orphan(sk);
2756
2757 xfrm_sk_free_policy(sk);
2758
e6848976 2759 sk_refcnt_debug_release(sk);
5640f768
ED		 2760
2761 if (sk->sk_frag.page) {
2762 put_page(sk->sk_frag.page);
2763 sk->sk_frag.page = NULL;
2764 }
2765
1da177e4
LT		 2766 sock_put(sk);
2767}
1da177e4
LT		 2768EXPORT_SYMBOL(sk_common_release);
2769
13ff3d6f
PE		 2770#ifdef CONFIG_PROC_FS
2771#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2772struct prot_inuse {
2773 int val[PROTO_INUSE_NR];
2774};
13ff3d6f
PE		 2775
2776static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2777
2778#ifdef CONFIG_NET_NS
2779void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2780{
d6d9ca0f 2781 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2782}
2783EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2784
2785int sock_prot_inuse_get(struct net *net, struct proto *prot)
2786{
2787 int cpu, idx = prot->inuse_idx;
2788 int res = 0;
2789
2790 for_each_possible_cpu(cpu)
2791 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2792
2793 return res >= 0 ? res : 0;
2794}
2795EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2796
2c8c1e72 2797static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2798{
2799 net->core.inuse = alloc_percpu(struct prot_inuse);
2800 return net->core.inuse ? 0 : -ENOMEM;
2801}
2802
2c8c1e72 2803static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2804{
2805 free_percpu(net->core.inuse);
2806}
2807
2808static struct pernet_operations net_inuse_ops = {
2809 .init = sock_inuse_init_net,
2810 .exit = sock_inuse_exit_net,
2811};
2812
2813static __init int net_inuse_init(void)
2814{
2815 if (register_pernet_subsys(&net_inuse_ops))
2816 panic("Cannot initialize net inuse counters");
2817
2818 return 0;
2819}
2820
2821core_initcall(net_inuse_init);
2822#else
1338d466
PE		 2823static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2824
c29a0bc4 2825void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2826{
d6d9ca0f 2827 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2828}
2829EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2830
c29a0bc4 2831int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2832{
2833 int cpu, idx = prot->inuse_idx;
2834 int res = 0;
2835
2836 for_each_possible_cpu(cpu)
2837 res += per_cpu(prot_inuse, cpu).val[idx];
2838
2839 return res >= 0 ? res : 0;
2840}
2841EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2842#endif
13ff3d6f
PE		 2843
2844static void assign_proto_idx(struct proto *prot)
2845{
2846 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2847
2848 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2849 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2850 return;
2851 }
2852
2853 set_bit(prot->inuse_idx, proto_inuse_idx);
2854}
2855
2856static void release_proto_idx(struct proto *prot)
2857{
2858 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2859 clear_bit(prot->inuse_idx, proto_inuse_idx);
2860}
2861#else
2862static inline void assign_proto_idx(struct proto *prot)
2863{
2864}
2865
2866static inline void release_proto_idx(struct proto *prot)
2867{
2868}
2869#endif
2870
0159dfd3
ED		 2871static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
2872{
2873 if (!rsk_prot)
2874 return;
2875 kfree(rsk_prot->slab_name);
2876 rsk_prot->slab_name = NULL;
adf78eda
JL		 2877 kmem_cache_destroy(rsk_prot->slab);
2878 rsk_prot->slab = NULL;
0159dfd3
ED		 2879}
2880
2881static int req_prot_init(const struct proto *prot)
2882{
2883 struct request_sock_ops *rsk_prot = prot->rsk_prot;
2884
2885 if (!rsk_prot)
2886 return 0;
2887
2888 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
2889 prot->name);
2890 if (!rsk_prot->slab_name)
2891 return -ENOMEM;
2892
2893 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
2894 rsk_prot->obj_size, 0,
e96f78ab 2895 prot->slab_flags, NULL);
0159dfd3
ED		 2896
2897 if (!rsk_prot->slab) {
2898 pr_crit("%s: Can't create request sock SLAB cache!\n",
2899 prot->name);
2900 return -ENOMEM;
2901 }
2902 return 0;
2903}
2904
b733c007
PE		 2905int proto_register(struct proto *prot, int alloc_slab)
2906{
1da177e4
LT		 2907 if (alloc_slab) {
2908 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2909 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2910 NULL);
1da177e4
LT		 2911
2912 if (prot->slab == NULL) {
e005d193
JP		 2913 pr_crit("%s: Can't create sock SLAB cache!\n",
2914 prot->name);
60e7663d 2915 goto out;
1da177e4 2916 }
2e6599cb 2917
0159dfd3
ED		 2918 if (req_prot_init(prot))
2919 goto out_free_request_sock_slab;
8feaf0c0 2920
6d6ee43e 2921 if (prot->twsk_prot != NULL) {
faf23422 2922 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2923
7e56b5d6 2924 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2925 goto out_free_request_sock_slab;
2926
6d6ee43e 2927 prot->twsk_prot->twsk_slab =
7e56b5d6 2928 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2929 prot->twsk_prot->twsk_obj_size,
3ab5aee7 2930 0,
52db70dc 2931 prot->slab_flags,
20c2df83 2932 NULL);
6d6ee43e 2933 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2934 goto out_free_timewait_sock_slab_name;
2935 }
1da177e4
LT		 2936 }
2937
36b77a52 2938 mutex_lock(&proto_list_mutex);
1da177e4 2939 list_add(&prot->node, &proto_list);
13ff3d6f 2940 assign_proto_idx(prot);
36b77a52 2941 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2942 return 0;
2943
8feaf0c0 2944out_free_timewait_sock_slab_name:
7e56b5d6 2945 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0 2946out_free_request_sock_slab:
0159dfd3
ED		 2947 req_prot_cleanup(prot->rsk_prot);
2948
2e6599cb
ACM		 2949 kmem_cache_destroy(prot->slab);
2950 prot->slab = NULL;
b733c007
PE		 2951out:
2952 return -ENOBUFS;
1da177e4 2953}
1da177e4
LT		 2954EXPORT_SYMBOL(proto_register);
2955
2956void proto_unregister(struct proto *prot)
2957{
36b77a52 2958 mutex_lock(&proto_list_mutex);
13ff3d6f 2959 release_proto_idx(prot);
0a3f4358 2960 list_del(&prot->node);
36b77a52 2961 mutex_unlock(&proto_list_mutex);
1da177e4 2962
adf78eda
JL		 2963 kmem_cache_destroy(prot->slab);
2964 prot->slab = NULL;
1da177e4 2965
0159dfd3 2966 req_prot_cleanup(prot->rsk_prot);
2e6599cb 2967
6d6ee43e 2968 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2969 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2970 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2971 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2972 }
1da177e4 2973}
1da177e4
LT		 2974EXPORT_SYMBOL(proto_unregister);
2975
2976#ifdef CONFIG_PROC_FS
1da177e4 2977static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2978 __acquires(proto_list_mutex)
1da177e4 2979{
36b77a52 2980 mutex_lock(&proto_list_mutex);
60f0438a 2981 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2982}
2983
2984static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2985{
60f0438a 2986 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2987}
2988
2989static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2990 __releases(proto_list_mutex)
1da177e4 2991{
36b77a52 2992 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2993}
2994
2995static char proto_method_implemented(const void *method)
2996{
2997 return method == NULL ? 'n' : 'y';
2998}
180d8cd9
GC		 2999static long sock_prot_memory_allocated(struct proto *proto)
3000{
cb75a36c 3001 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 3002}
3003
3004static char *sock_prot_memory_pressure(struct proto *proto)
3005{
3006 return proto->memory_pressure != NULL ?
3007 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
3008}
1da177e4
LT		 3009
3010static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
3011{
180d8cd9 3012
8d987e5c 3013 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 3014 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3015 proto->name,
3016 proto->obj_size,
14e943db 3017 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 3018 sock_prot_memory_allocated(proto),
3019 sock_prot_memory_pressure(proto),
1da177e4
LT		 3020 proto->max_header,
3021 proto->slab == NULL ? "no" : "yes",
3022 module_name(proto->owner),
3023 proto_method_implemented(proto->close),
3024 proto_method_implemented(proto->connect),
3025 proto_method_implemented(proto->disconnect),
3026 proto_method_implemented(proto->accept),
3027 proto_method_implemented(proto->ioctl),
3028 proto_method_implemented(proto->init),
3029 proto_method_implemented(proto->destroy),
3030 proto_method_implemented(proto->shutdown),
3031 proto_method_implemented(proto->setsockopt),
3032 proto_method_implemented(proto->getsockopt),
3033 proto_method_implemented(proto->sendmsg),
3034 proto_method_implemented(proto->recvmsg),
3035 proto_method_implemented(proto->sendpage),
3036 proto_method_implemented(proto->bind),
3037 proto_method_implemented(proto->backlog_rcv),
3038 proto_method_implemented(proto->hash),
3039 proto_method_implemented(proto->unhash),
3040 proto_method_implemented(proto->get_port),
3041 proto_method_implemented(proto->enter_memory_pressure));
3042}
3043
3044static int proto_seq_show(struct seq_file *seq, void *v)
3045{
60f0438a 3046 if (v == &proto_list)
1da177e4
LT		 3047 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3048 "protocol",
3049 "size",
3050 "sockets",
3051 "memory",
3052 "press",
3053 "maxhdr",
3054 "slab",
3055 "module",
3056 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3057 else
60f0438a 3058 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 3059 return 0;
3060}
3061
f690808e 3062static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 3063 .start = proto_seq_start,
3064 .next = proto_seq_next,
3065 .stop = proto_seq_stop,
3066 .show = proto_seq_show,
3067};
3068
3069static int proto_seq_open(struct inode *inode, struct file *file)
3070{
14e943db
ED		 3071 return seq_open_net(inode, file, &proto_seq_ops,
3072 sizeof(struct seq_net_private));
1da177e4
LT		 3073}
3074
9a32144e 3075static const struct file_operations proto_seq_fops = {
1da177e4
LT		 3076 .owner = THIS_MODULE,
3077 .open = proto_seq_open,
3078 .read = seq_read,
3079 .llseek = seq_lseek,
14e943db
ED		 3080 .release = seq_release_net,
3081};
3082
3083static __net_init int proto_init_net(struct net *net)
3084{
d4beaa66 3085 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 3086 return -ENOMEM;
3087
3088 return 0;
3089}
3090
3091static __net_exit void proto_exit_net(struct net *net)
3092{
ece31ffd 3093 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 3094}
3095
3096
3097static __net_initdata struct pernet_operations proto_net_ops = {
3098 .init = proto_init_net,
3099 .exit = proto_exit_net,
1da177e4
LT		 3100};
3101
3102static int __init proto_init(void)
3103{
14e943db 3104 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 3105}
3106
3107subsys_initcall(proto_init);
3108
3109#endif /* PROC_FS */
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