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Linux 4.16-rc1
[linux-2.6-block.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>
f1083048 105#include <linux/sched/mm.h>
1da177e4
LT		 106#include <linux/timer.h>
107#include <linux/string.h>
108#include <linux/sockios.h>
109#include <linux/net.h>
110#include <linux/mm.h>
111#include <linux/slab.h>
112#include <linux/interrupt.h>
113#include <linux/poll.h>
114#include <linux/tcp.h>
115#include <linux/init.h>
a1f8e7f7 116#include <linux/highmem.h>
3f551f94 117#include <linux/user_namespace.h>
c5905afb 118#include <linux/static_key.h>
3969eb38 119#include <linux/memcontrol.h>
8c1ae10d 120#include <linux/prefetch.h>
1da177e4 121
7c0f6ba6 122#include <linux/uaccess.h>
1da177e4
LT		 123
124#include <linux/netdevice.h>
125#include <net/protocol.h>
126#include <linux/skbuff.h>
457c4cbc 127#include <net/net_namespace.h>
2e6599cb 128#include <net/request_sock.h>
1da177e4 129#include <net/sock.h>
20d49473 130#include <linux/net_tstamp.h>
1da177e4
LT		 131#include <net/xfrm.h>
132#include <linux/ipsec.h>
f8451725 133#include <net/cls_cgroup.h>
5bc1421e 134#include <net/netprio_cgroup.h>
eb4cb008 135#include <linux/sock_diag.h>
1da177e4
LT		 136
137#include <linux/filter.h>
538950a1 138#include <net/sock_reuseport.h>
1da177e4 139
3847ce32
SM		 140#include <trace/events/sock.h>
141
1da177e4 142#include <net/tcp.h>
076bb0c8 143#include <net/busy_poll.h>
06021292 144
36b77a52 145static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 146static LIST_HEAD(proto_list);
147
648845ab
TZ		 148static void sock_inuse_add(struct net *net, int val);
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
cdfbabfb
DH		 200 * one slock key per address family and separate keys for internal and
201 * userspace sockets.
da21f24d 202 */
a5b5bb9a 203static struct lock_class_key af_family_keys[AF_MAX];
cdfbabfb 204static struct lock_class_key af_family_kern_keys[AF_MAX];
a5b5bb9a 205static struct lock_class_key af_family_slock_keys[AF_MAX];
cdfbabfb 206static struct lock_class_key af_family_kern_slock_keys[AF_MAX];
a5b5bb9a 207
a5b5bb9a
IM		 208/*
209 * Make lock validator output more readable. (we pre-construct these
210 * strings build-time, so that runtime initialization of socket
211 * locks is fast):
212 */
cdfbabfb
DH		 213
214#define _sock_locks(x) \
215 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \
216 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \
217 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \
218 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \
219 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \
220 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \
221 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \
222 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \
223 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \
224 x "27" , x "28" , x "AF_CAN" , \
225 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \
226 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \
227 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \
228 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \
229 x "AF_QIPCRTR", x "AF_SMC" , x "AF_MAX"
230
36cbd3dc 231static const char *const af_family_key_strings[AF_MAX+1] = {
cdfbabfb 232 _sock_locks("sk_lock-")
a5b5bb9a 233};
36cbd3dc 234static const char *const af_family_slock_key_strings[AF_MAX+1] = {
cdfbabfb 235 _sock_locks("slock-")
a5b5bb9a 236};
36cbd3dc 237static const char *const af_family_clock_key_strings[AF_MAX+1] = {
cdfbabfb
DH		 238 _sock_locks("clock-")
239};
240
241static const char *const af_family_kern_key_strings[AF_MAX+1] = {
242 _sock_locks("k-sk_lock-")
243};
244static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = {
245 _sock_locks("k-slock-")
246};
247static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = {
248 _sock_locks("k-clock-")
443aef0e 249};
581319c5
PA		 250static const char *const af_family_rlock_key_strings[AF_MAX+1] = {
251 "rlock-AF_UNSPEC", "rlock-AF_UNIX" , "rlock-AF_INET" ,
252 "rlock-AF_AX25" , "rlock-AF_IPX" , "rlock-AF_APPLETALK",
253 "rlock-AF_NETROM", "rlock-AF_BRIDGE" , "rlock-AF_ATMPVC" ,
254 "rlock-AF_X25" , "rlock-AF_INET6" , "rlock-AF_ROSE" ,
255 "rlock-AF_DECnet", "rlock-AF_NETBEUI" , "rlock-AF_SECURITY" ,
256 "rlock-AF_KEY" , "rlock-AF_NETLINK" , "rlock-AF_PACKET" ,
257 "rlock-AF_ASH" , "rlock-AF_ECONET" , "rlock-AF_ATMSVC" ,
258 "rlock-AF_RDS" , "rlock-AF_SNA" , "rlock-AF_IRDA" ,
259 "rlock-AF_PPPOX" , "rlock-AF_WANPIPE" , "rlock-AF_LLC" ,
260 "rlock-27" , "rlock-28" , "rlock-AF_CAN" ,
261 "rlock-AF_TIPC" , "rlock-AF_BLUETOOTH", "rlock-AF_IUCV" ,
262 "rlock-AF_RXRPC" , "rlock-AF_ISDN" , "rlock-AF_PHONET" ,
263 "rlock-AF_IEEE802154", "rlock-AF_CAIF" , "rlock-AF_ALG" ,
264 "rlock-AF_NFC" , "rlock-AF_VSOCK" , "rlock-AF_KCM" ,
265 "rlock-AF_QIPCRTR", "rlock-AF_SMC" , "rlock-AF_MAX"
266};
267static const char *const af_family_wlock_key_strings[AF_MAX+1] = {
268 "wlock-AF_UNSPEC", "wlock-AF_UNIX" , "wlock-AF_INET" ,
269 "wlock-AF_AX25" , "wlock-AF_IPX" , "wlock-AF_APPLETALK",
270 "wlock-AF_NETROM", "wlock-AF_BRIDGE" , "wlock-AF_ATMPVC" ,
271 "wlock-AF_X25" , "wlock-AF_INET6" , "wlock-AF_ROSE" ,
272 "wlock-AF_DECnet", "wlock-AF_NETBEUI" , "wlock-AF_SECURITY" ,
273 "wlock-AF_KEY" , "wlock-AF_NETLINK" , "wlock-AF_PACKET" ,
274 "wlock-AF_ASH" , "wlock-AF_ECONET" , "wlock-AF_ATMSVC" ,
275 "wlock-AF_RDS" , "wlock-AF_SNA" , "wlock-AF_IRDA" ,
276 "wlock-AF_PPPOX" , "wlock-AF_WANPIPE" , "wlock-AF_LLC" ,
277 "wlock-27" , "wlock-28" , "wlock-AF_CAN" ,
278 "wlock-AF_TIPC" , "wlock-AF_BLUETOOTH", "wlock-AF_IUCV" ,
279 "wlock-AF_RXRPC" , "wlock-AF_ISDN" , "wlock-AF_PHONET" ,
280 "wlock-AF_IEEE802154", "wlock-AF_CAIF" , "wlock-AF_ALG" ,
281 "wlock-AF_NFC" , "wlock-AF_VSOCK" , "wlock-AF_KCM" ,
282 "wlock-AF_QIPCRTR", "wlock-AF_SMC" , "wlock-AF_MAX"
283};
284static const char *const af_family_elock_key_strings[AF_MAX+1] = {
285 "elock-AF_UNSPEC", "elock-AF_UNIX" , "elock-AF_INET" ,
286 "elock-AF_AX25" , "elock-AF_IPX" , "elock-AF_APPLETALK",
287 "elock-AF_NETROM", "elock-AF_BRIDGE" , "elock-AF_ATMPVC" ,
288 "elock-AF_X25" , "elock-AF_INET6" , "elock-AF_ROSE" ,
289 "elock-AF_DECnet", "elock-AF_NETBEUI" , "elock-AF_SECURITY" ,
290 "elock-AF_KEY" , "elock-AF_NETLINK" , "elock-AF_PACKET" ,
291 "elock-AF_ASH" , "elock-AF_ECONET" , "elock-AF_ATMSVC" ,
292 "elock-AF_RDS" , "elock-AF_SNA" , "elock-AF_IRDA" ,
293 "elock-AF_PPPOX" , "elock-AF_WANPIPE" , "elock-AF_LLC" ,
294 "elock-27" , "elock-28" , "elock-AF_CAN" ,
295 "elock-AF_TIPC" , "elock-AF_BLUETOOTH", "elock-AF_IUCV" ,
296 "elock-AF_RXRPC" , "elock-AF_ISDN" , "elock-AF_PHONET" ,
297 "elock-AF_IEEE802154", "elock-AF_CAIF" , "elock-AF_ALG" ,
298 "elock-AF_NFC" , "elock-AF_VSOCK" , "elock-AF_KCM" ,
299 "elock-AF_QIPCRTR", "elock-AF_SMC" , "elock-AF_MAX"
300};
da21f24d
IM		 301
302/*
581319c5 303 * sk_callback_lock and sk queues locking rules are per-address-family,
da21f24d
IM		 304 * so split the lock classes by using a per-AF key:
305 */
306static struct lock_class_key af_callback_keys[AF_MAX];
581319c5
PA		 307static struct lock_class_key af_rlock_keys[AF_MAX];
308static struct lock_class_key af_wlock_keys[AF_MAX];
309static struct lock_class_key af_elock_keys[AF_MAX];
cdfbabfb 310static struct lock_class_key af_kern_callback_keys[AF_MAX];
da21f24d 311
1da177e4 312/* Run time adjustable parameters. */
ab32ea5d 313__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 314EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 315__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 316EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 317__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
318__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 319
25985edc 320/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 321int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 322EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 323
b245be1f
WB		 324int sysctl_tstamp_allow_data __read_mostly = 1;
325
c93bdd0e
MG		 326struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
327EXPORT_SYMBOL_GPL(memalloc_socks);
328
7cb02404
MG		 329/**
330 * sk_set_memalloc - sets %SOCK_MEMALLOC
331 * @sk: socket to set it on
332 *
333 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
334 * It's the responsibility of the admin to adjust min_free_kbytes
335 * to meet the requirements
336 */
337void sk_set_memalloc(struct sock *sk)
338{
339 sock_set_flag(sk, SOCK_MEMALLOC);
340 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 341 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 342}
343EXPORT_SYMBOL_GPL(sk_set_memalloc);
344
345void sk_clear_memalloc(struct sock *sk)
346{
347 sock_reset_flag(sk, SOCK_MEMALLOC);
348 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 349 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 350
351 /*
352 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
5d753610
MG		 353 * progress of swapping. SOCK_MEMALLOC may be cleared while
354 * it has rmem allocations due to the last swapfile being deactivated
355 * but there is a risk that the socket is unusable due to exceeding
356 * the rmem limits. Reclaim the reserves and obey rmem limits again.
c76562b6 357 */
5d753610 358 sk_mem_reclaim(sk);
7cb02404
MG		 359}
360EXPORT_SYMBOL_GPL(sk_clear_memalloc);
361
b4b9e355
MG		 362int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
363{
364 int ret;
f1083048 365 unsigned int noreclaim_flag;
b4b9e355
MG		 366
367 /* these should have been dropped before queueing */
368 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
369
f1083048 370 noreclaim_flag = memalloc_noreclaim_save();
b4b9e355 371 ret = sk->sk_backlog_rcv(sk, skb);
f1083048 372 memalloc_noreclaim_restore(noreclaim_flag);
b4b9e355
MG		 373
374 return ret;
375}
376EXPORT_SYMBOL(__sk_backlog_rcv);
377
1da177e4
LT		 378static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
379{
380 struct timeval tv;
381
382 if (optlen < sizeof(tv))
383 return -EINVAL;
384 if (copy_from_user(&tv, optval, sizeof(tv)))
385 return -EFAULT;
ba78073e
VA		 386 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
387 return -EDOM;
1da177e4 388
ba78073e 389 if (tv.tv_sec < 0) {
6f11df83
AM		 390 static int warned __read_mostly;
391
ba78073e 392 *timeo_p = 0;
50aab54f 393 if (warned < 10 && net_ratelimit()) {
ba78073e 394 warned++;
e005d193
JP		 395 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
396 __func__, current->comm, task_pid_nr(current));
50aab54f 397 }
ba78073e
VA		 398 return 0;
399 }
1da177e4
LT		 400 *timeo_p = MAX_SCHEDULE_TIMEOUT;
401 if (tv.tv_sec == 0 && tv.tv_usec == 0)
402 return 0;
403 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
8ccde4c5 404 *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP(tv.tv_usec, USEC_PER_SEC / HZ);
1da177e4
LT		 405 return 0;
406}
407
408static void sock_warn_obsolete_bsdism(const char *name)
409{
410 static int warned;
411 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 412 if (strcmp(warncomm, current->comm) && warned < 5) {
413 strcpy(warncomm, current->comm);
e005d193
JP		 414 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
415 warncomm, name);
1da177e4
LT		 416 warned++;
417 }
418}
419
080a270f
HFS		 420static bool sock_needs_netstamp(const struct sock *sk)
421{
422 switch (sk->sk_family) {
423 case AF_UNSPEC:
424 case AF_UNIX:
425 return false;
426 default:
427 return true;
428 }
429}
430
08e29af3 431static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 432{
08e29af3
ED		 433 if (sk->sk_flags & flags) {
434 sk->sk_flags &= ~flags;
080a270f
HFS		 435 if (sock_needs_netstamp(sk) &&
436 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 437 net_disable_timestamp();
1da177e4
LT		 438 }
439}
440
441
e6afc8ac 442int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
f0088a50 443{
3b885787
NH		 444 unsigned long flags;
445 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 446
0fd7bac6 447 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 448 atomic_inc(&sk->sk_drops);
3847ce32 449 trace_sock_rcvqueue_full(sk, skb);
766e9037 450 return -ENOMEM;
f0088a50
DV		 451 }
452
c76562b6 453 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 454 atomic_inc(&sk->sk_drops);
455 return -ENOBUFS;
3ab224be
HA		 456 }
457
f0088a50
DV		 458 skb->dev = NULL;
459 skb_set_owner_r(skb, sk);
49ad9599 460
7fee226a
ED		 461 /* we escape from rcu protected region, make sure we dont leak
462 * a norefcounted dst
463 */
464 skb_dst_force(skb);
465
3b885787 466 spin_lock_irqsave(&list->lock, flags);
3bc3b96f 467 sock_skb_set_dropcount(sk, skb);
3b885787
NH		 468 __skb_queue_tail(list, skb);
469 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 470
471 if (!sock_flag(sk, SOCK_DEAD))
676d2369 472 sk->sk_data_ready(sk);
766e9037 473 return 0;
f0088a50 474}
e6afc8ac 475EXPORT_SYMBOL(__sock_queue_rcv_skb);
476
477int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
478{
479 int err;
480
481 err = sk_filter(sk, skb);
482 if (err)
483 return err;
484
485 return __sock_queue_rcv_skb(sk, skb);
486}
f0088a50
DV		 487EXPORT_SYMBOL(sock_queue_rcv_skb);
488
4f0c40d9 489int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
c3f24cfb 490 const int nested, unsigned int trim_cap, bool refcounted)
f0088a50
DV		 491{
492 int rc = NET_RX_SUCCESS;
493
4f0c40d9 494 if (sk_filter_trim_cap(sk, skb, trim_cap))
f0088a50
DV		 495 goto discard_and_relse;
496
497 skb->dev = NULL;
498
274f482d 499 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 500 atomic_inc(&sk->sk_drops);
501 goto discard_and_relse;
502 }
58a5a7b9
ACM		 503 if (nested)
504 bh_lock_sock_nested(sk);
505 else
506 bh_lock_sock(sk);
a5b5bb9a
IM		 507 if (!sock_owned_by_user(sk)) {
508 /*
509 * trylock + unlock semantics:
510 */
511 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
512
c57943a1 513 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 514
515 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 516 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 517 bh_unlock_sock(sk);
518 atomic_inc(&sk->sk_drops);
519 goto discard_and_relse;
520 }
521
f0088a50
DV		 522 bh_unlock_sock(sk);
523out:
c3f24cfb
ED		 524 if (refcounted)
525 sock_put(sk);
f0088a50
DV		 526 return rc;
527discard_and_relse:
528 kfree_skb(skb);
529 goto out;
530}
4f0c40d9 531EXPORT_SYMBOL(__sk_receive_skb);
f0088a50
DV		 532
533struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
534{
b6c6712a 535 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 536
537 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 538 sk_tx_queue_clear(sk);
9b8805a3 539 sk->sk_dst_pending_confirm = 0;
a9b3cd7f 540 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 541 dst_release(dst);
542 return NULL;
543 }
544
545 return dst;
546}
547EXPORT_SYMBOL(__sk_dst_check);
548
549struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
550{
551 struct dst_entry *dst = sk_dst_get(sk);
552
553 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
554 sk_dst_reset(sk);
555 dst_release(dst);
556 return NULL;
557 }
558
559 return dst;
560}
561EXPORT_SYMBOL(sk_dst_check);
562
c91f6df2
BH		 563static int sock_setbindtodevice(struct sock *sk, char __user *optval,
564 int optlen)
4878809f
DM		 565{
566 int ret = -ENOPROTOOPT;
567#ifdef CONFIG_NETDEVICES
3b1e0a65 568 struct net *net = sock_net(sk);
4878809f
DM		 569 char devname[IFNAMSIZ];
570 int index;
571
572 /* Sorry... */
573 ret = -EPERM;
5e1fccc0 574 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 575 goto out;
576
577 ret = -EINVAL;
578 if (optlen < 0)
579 goto out;
580
581 /* Bind this socket to a particular device like "eth0",
582 * as specified in the passed interface name. If the
583 * name is "" or the option length is zero the socket
584 * is not bound.
585 */
586 if (optlen > IFNAMSIZ - 1)
587 optlen = IFNAMSIZ - 1;
588 memset(devname, 0, sizeof(devname));
589
590 ret = -EFAULT;
591 if (copy_from_user(devname, optval, optlen))
592 goto out;
593
000ba2e4
DM		 594 index = 0;
595 if (devname[0] != '\0') {
bf8e56bf 596 struct net_device *dev;
4878809f 597
bf8e56bf
ED		 598 rcu_read_lock();
599 dev = dev_get_by_name_rcu(net, devname);
600 if (dev)
601 index = dev->ifindex;
602 rcu_read_unlock();
4878809f
DM		 603 ret = -ENODEV;
604 if (!dev)
605 goto out;
4878809f
DM		 606 }
607
608 lock_sock(sk);
609 sk->sk_bound_dev_if = index;
610 sk_dst_reset(sk);
611 release_sock(sk);
612
613 ret = 0;
614
615out:
616#endif
617
618 return ret;
619}
620
c91f6df2
BH		 621static int sock_getbindtodevice(struct sock *sk, char __user *optval,
622 int __user *optlen, int len)
623{
624 int ret = -ENOPROTOOPT;
625#ifdef CONFIG_NETDEVICES
626 struct net *net = sock_net(sk);
c91f6df2 627 char devname[IFNAMSIZ];
c91f6df2
BH		 628
629 if (sk->sk_bound_dev_if == 0) {
630 len = 0;
631 goto zero;
632 }
633
634 ret = -EINVAL;
635 if (len < IFNAMSIZ)
636 goto out;
637
5dbe7c17
NS		 638 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
639 if (ret)
c91f6df2 640 goto out;
c91f6df2
BH		 641
642 len = strlen(devname) + 1;
643
644 ret = -EFAULT;
645 if (copy_to_user(optval, devname, len))
646 goto out;
647
648zero:
649 ret = -EFAULT;
650 if (put_user(len, optlen))
651 goto out;
652
653 ret = 0;
654
655out:
656#endif
657
658 return ret;
659}
660
c0ef877b
PE		 661static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
662{
663 if (valbool)
664 sock_set_flag(sk, bit);
665 else
666 sock_reset_flag(sk, bit);
667}
668
f60e5990 669bool sk_mc_loop(struct sock *sk)
670{
671 if (dev_recursion_level())
672 return false;
673 if (!sk)
674 return true;
675 switch (sk->sk_family) {
676 case AF_INET:
677 return inet_sk(sk)->mc_loop;
678#if IS_ENABLED(CONFIG_IPV6)
679 case AF_INET6:
680 return inet6_sk(sk)->mc_loop;
681#endif
682 }
683 WARN_ON(1);
684 return true;
685}
686EXPORT_SYMBOL(sk_mc_loop);
687
1da177e4
LT		 688/*
689 * This is meant for all protocols to use and covers goings on
690 * at the socket level. Everything here is generic.
691 */
692
693int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 694 char __user *optval, unsigned int optlen)
1da177e4 695{
2a91525c 696 struct sock *sk = sock->sk;
1da177e4
LT		 697 int val;
698 int valbool;
699 struct linger ling;
700 int ret = 0;
4ec93edb 701
1da177e4
LT		 702 /*
703 * Options without arguments
704 */
705
4878809f 706 if (optname == SO_BINDTODEVICE)
c91f6df2 707 return sock_setbindtodevice(sk, optval, optlen);
4878809f 708
e71a4783
SH		 709 if (optlen < sizeof(int))
710 return -EINVAL;
4ec93edb 711
1da177e4
LT		 712 if (get_user(val, (int __user *)optval))
713 return -EFAULT;
4ec93edb 714
2a91525c 715 valbool = val ? 1 : 0;
1da177e4
LT		 716
717 lock_sock(sk);
718
2a91525c 719 switch (optname) {
e71a4783 720 case SO_DEBUG:
2a91525c 721 if (val && !capable(CAP_NET_ADMIN))
e71a4783 722 ret = -EACCES;
2a91525c 723 else
c0ef877b 724 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 725 break;
726 case SO_REUSEADDR:
4a17fd52 727 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 728 break;
055dc21a
TH		 729 case SO_REUSEPORT:
730 sk->sk_reuseport = valbool;
731 break;
e71a4783 732 case SO_TYPE:
49c794e9 733 case SO_PROTOCOL:
0d6038ee 734 case SO_DOMAIN:
e71a4783
SH		 735 case SO_ERROR:
736 ret = -ENOPROTOOPT;
737 break;
738 case SO_DONTROUTE:
c0ef877b 739 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 740 break;
741 case SO_BROADCAST:
742 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
743 break;
744 case SO_SNDBUF:
745 /* Don't error on this BSD doesn't and if you think
82981930
ED		 746 * about it this is right. Otherwise apps have to
747 * play 'guess the biggest size' games. RCVBUF/SNDBUF
748 * are treated in BSD as hints
749 */
750 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 751set_sndbuf:
e71a4783 752 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
b98b0bc8 753 sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF);
82981930 754 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 755 sk->sk_write_space(sk);
756 break;
1da177e4 757
e71a4783
SH		 758 case SO_SNDBUFFORCE:
759 if (!capable(CAP_NET_ADMIN)) {
760 ret = -EPERM;
761 break;
762 }
763 goto set_sndbuf;
b0573dea 764
e71a4783
SH		 765 case SO_RCVBUF:
766 /* Don't error on this BSD doesn't and if you think
82981930
ED		 767 * about it this is right. Otherwise apps have to
768 * play 'guess the biggest size' games. RCVBUF/SNDBUF
769 * are treated in BSD as hints
770 */
771 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 772set_rcvbuf:
e71a4783
SH		 773 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
774 /*
775 * We double it on the way in to account for
776 * "struct sk_buff" etc. overhead. Applications
777 * assume that the SO_RCVBUF setting they make will
778 * allow that much actual data to be received on that
779 * socket.
780 *
781 * Applications are unaware that "struct sk_buff" and
782 * other overheads allocate from the receive buffer
783 * during socket buffer allocation.
784 *
785 * And after considering the possible alternatives,
786 * returning the value we actually used in getsockopt
787 * is the most desirable behavior.
788 */
b98b0bc8 789 sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 790 break;
791
792 case SO_RCVBUFFORCE:
793 if (!capable(CAP_NET_ADMIN)) {
794 ret = -EPERM;
1da177e4 795 break;
e71a4783
SH		 796 }
797 goto set_rcvbuf;
1da177e4 798
e71a4783 799 case SO_KEEPALIVE:
4b9d07a4
UB		 800 if (sk->sk_prot->keepalive)
801 sk->sk_prot->keepalive(sk, valbool);
e71a4783
SH		 802 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
803 break;
804
805 case SO_OOBINLINE:
806 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
807 break;
808
809 case SO_NO_CHECK:
28448b80 810 sk->sk_no_check_tx = valbool;
e71a4783
SH		 811 break;
812
813 case SO_PRIORITY:
5e1fccc0
EB		 814 if ((val >= 0 && val <= 6) ||
815 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 816 sk->sk_priority = val;
817 else
818 ret = -EPERM;
819 break;
820
821 case SO_LINGER:
822 if (optlen < sizeof(ling)) {
823 ret = -EINVAL; /* 1003.1g */
1da177e4 824 break;
e71a4783 825 }
2a91525c 826 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 827 ret = -EFAULT;
1da177e4 828 break;
e71a4783
SH		 829 }
830 if (!ling.l_onoff)
831 sock_reset_flag(sk, SOCK_LINGER);
832 else {
1da177e4 833#if (BITS_PER_LONG == 32)
e71a4783
SH		 834 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
835 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 836 else
e71a4783
SH		 837#endif
838 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
839 sock_set_flag(sk, SOCK_LINGER);
840 }
841 break;
842
843 case SO_BSDCOMPAT:
844 sock_warn_obsolete_bsdism("setsockopt");
845 break;
846
847 case SO_PASSCRED:
848 if (valbool)
849 set_bit(SOCK_PASSCRED, &sock->flags);
850 else
851 clear_bit(SOCK_PASSCRED, &sock->flags);
852 break;
853
854 case SO_TIMESTAMP:
92f37fd2 855 case SO_TIMESTAMPNS:
e71a4783 856 if (valbool) {
92f37fd2
ED		 857 if (optname == SO_TIMESTAMP)
858 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
859 else
860 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 861 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 862 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 863 } else {
e71a4783 864 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 865 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
866 }
e71a4783
SH		 867 break;
868
20d49473
PO		 869 case SO_TIMESTAMPING:
870 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 871 ret = -EINVAL;
20d49473
PO		 872 break;
873 }
b245be1f 874
09c2d251 875 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765 876 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
ac5cc977
WC		 877 if (sk->sk_protocol == IPPROTO_TCP &&
878 sk->sk_type == SOCK_STREAM) {
6db8b963
SHY		 879 if ((1 << sk->sk_state) &
880 (TCPF_CLOSE | TCPF_LISTEN)) {
4ed2d765
WB		 881 ret = -EINVAL;
882 break;
883 }
884 sk->sk_tskey = tcp_sk(sk)->snd_una;
885 } else {
886 sk->sk_tskey = 0;
887 }
888 }
1c885808
FY		 889
890 if (val & SOF_TIMESTAMPING_OPT_STATS &&
891 !(val & SOF_TIMESTAMPING_OPT_TSONLY)) {
892 ret = -EINVAL;
893 break;
894 }
895
b9f40e21 896 sk->sk_tsflags = val;
20d49473
PO		 897 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
898 sock_enable_timestamp(sk,
899 SOCK_TIMESTAMPING_RX_SOFTWARE);
900 else
901 sock_disable_timestamp(sk,
08e29af3 902 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 903 break;
904
e71a4783
SH		 905 case SO_RCVLOWAT:
906 if (val < 0)
907 val = INT_MAX;
908 sk->sk_rcvlowat = val ? : 1;
909 break;
910
911 case SO_RCVTIMEO:
912 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
913 break;
914
915 case SO_SNDTIMEO:
916 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
917 break;
1da177e4 918
e71a4783
SH		 919 case SO_ATTACH_FILTER:
920 ret = -EINVAL;
921 if (optlen == sizeof(struct sock_fprog)) {
922 struct sock_fprog fprog;
1da177e4 923
e71a4783
SH		 924 ret = -EFAULT;
925 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 926 break;
e71a4783
SH		 927
928 ret = sk_attach_filter(&fprog, sk);
929 }
930 break;
931
89aa0758
AS		 932 case SO_ATTACH_BPF:
933 ret = -EINVAL;
934 if (optlen == sizeof(u32)) {
935 u32 ufd;
936
937 ret = -EFAULT;
938 if (copy_from_user(&ufd, optval, sizeof(ufd)))
939 break;
940
941 ret = sk_attach_bpf(ufd, sk);
942 }
943 break;
944
538950a1
CG		 945 case SO_ATTACH_REUSEPORT_CBPF:
946 ret = -EINVAL;
947 if (optlen == sizeof(struct sock_fprog)) {
948 struct sock_fprog fprog;
949
950 ret = -EFAULT;
951 if (copy_from_user(&fprog, optval, sizeof(fprog)))
952 break;
953
954 ret = sk_reuseport_attach_filter(&fprog, sk);
955 }
956 break;
957
958 case SO_ATTACH_REUSEPORT_EBPF:
959 ret = -EINVAL;
960 if (optlen == sizeof(u32)) {
961 u32 ufd;
962
963 ret = -EFAULT;
964 if (copy_from_user(&ufd, optval, sizeof(ufd)))
965 break;
966
967 ret = sk_reuseport_attach_bpf(ufd, sk);
968 }
969 break;
970
e71a4783 971 case SO_DETACH_FILTER:
55b33325 972 ret = sk_detach_filter(sk);
e71a4783 973 break;
1da177e4 974
d59577b6
VB		 975 case SO_LOCK_FILTER:
976 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
977 ret = -EPERM;
978 else
979 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
980 break;
981
e71a4783
SH		 982 case SO_PASSSEC:
983 if (valbool)
984 set_bit(SOCK_PASSSEC, &sock->flags);
985 else
986 clear_bit(SOCK_PASSSEC, &sock->flags);
987 break;
4a19ec58 988 case SO_MARK:
5e1fccc0 989 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 990 ret = -EPERM;
2a91525c 991 else
4a19ec58 992 sk->sk_mark = val;
4a19ec58 993 break;
877ce7c1 994
3b885787 995 case SO_RXQ_OVFL:
8083f0fc 996 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 997 break;
6e3e939f
JB		 998
999 case SO_WIFI_STATUS:
1000 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
1001 break;
1002
ef64a54f
PE		 1003 case SO_PEEK_OFF:
1004 if (sock->ops->set_peek_off)
12663bfc 1005 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 1006 else
1007 ret = -EOPNOTSUPP;
1008 break;
3bdc0eba
BG		 1009
1010 case SO_NOFCS:
1011 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
1012 break;
1013
7d4c04fc
KJ		 1014 case SO_SELECT_ERR_QUEUE:
1015 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
1016 break;
1017
e0d1095a 1018#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1019 case SO_BUSY_POLL:
dafcc438
ET		 1020 /* allow unprivileged users to decrease the value */
1021 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
1022 ret = -EPERM;
1023 else {
1024 if (val < 0)
1025 ret = -EINVAL;
1026 else
1027 sk->sk_ll_usec = val;
1028 }
1029 break;
1030#endif
62748f32
ED		 1031
1032 case SO_MAX_PACING_RATE:
218af599
ED		 1033 if (val != ~0U)
1034 cmpxchg(&sk->sk_pacing_status,
1035 SK_PACING_NONE,
1036 SK_PACING_NEEDED);
62748f32
ED		 1037 sk->sk_max_pacing_rate = val;
1038 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
1039 sk->sk_max_pacing_rate);
1040 break;
1041
70da268b
ED		 1042 case SO_INCOMING_CPU:
1043 sk->sk_incoming_cpu = val;
1044 break;
1045
a87cb3e4
TH		 1046 case SO_CNX_ADVICE:
1047 if (val == 1)
1048 dst_negative_advice(sk);
1049 break;
76851d12
WB		 1050
1051 case SO_ZEROCOPY:
1052 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
1053 ret = -ENOTSUPP;
1054 else if (sk->sk_protocol != IPPROTO_TCP)
1055 ret = -ENOTSUPP;
1056 else if (sk->sk_state != TCP_CLOSE)
1057 ret = -EBUSY;
1058 else if (val < 0 || val > 1)
1059 ret = -EINVAL;
1060 else
1061 sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool);
1062 break;
1063
e71a4783
SH		 1064 default:
1065 ret = -ENOPROTOOPT;
1066 break;
4ec93edb 1067 }
1da177e4
LT		 1068 release_sock(sk);
1069 return ret;
1070}
2a91525c 1071EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 1072
1073
8f09898b 1074static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1075 struct ucred *ucred)
3f551f94
EB		 1076{
1077 ucred->pid = pid_vnr(pid);
1078 ucred->uid = ucred->gid = -1;
1079 if (cred) {
1080 struct user_namespace *current_ns = current_user_ns();
1081
b2e4f544
EB		 1082 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1083 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 1084 }
1085}
1086
28b5ba2a
DH		 1087static int groups_to_user(gid_t __user *dst, const struct group_info *src)
1088{
1089 struct user_namespace *user_ns = current_user_ns();
1090 int i;
1091
1092 for (i = 0; i < src->ngroups; i++)
1093 if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i))
1094 return -EFAULT;
1095
1096 return 0;
1097}
1098
1da177e4
LT		 1099int sock_getsockopt(struct socket *sock, int level, int optname,
1100 char __user *optval, int __user *optlen)
1101{
1102 struct sock *sk = sock->sk;
4ec93edb 1103
e71a4783 1104 union {
4ec93edb 1105 int val;
5daab9db 1106 u64 val64;
4ec93edb 1107 struct linger ling;
1da177e4
LT		 1108 struct timeval tm;
1109 } v;
4ec93edb 1110
4d0392be 1111 int lv = sizeof(int);
1da177e4 1112 int len;
4ec93edb 1113
e71a4783 1114 if (get_user(len, optlen))
4ec93edb 1115 return -EFAULT;
e71a4783 1116 if (len < 0)
1da177e4 1117 return -EINVAL;
4ec93edb 1118
50fee1de 1119 memset(&v, 0, sizeof(v));
df0bca04 1120
2a91525c 1121 switch (optname) {
e71a4783
SH		 1122 case SO_DEBUG:
1123 v.val = sock_flag(sk, SOCK_DBG);
1124 break;
1125
1126 case SO_DONTROUTE:
1127 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1128 break;
1129
1130 case SO_BROADCAST:
1b23a5df 1131 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1132 break;
1133
1134 case SO_SNDBUF:
1135 v.val = sk->sk_sndbuf;
1136 break;
1137
1138 case SO_RCVBUF:
1139 v.val = sk->sk_rcvbuf;
1140 break;
1141
1142 case SO_REUSEADDR:
1143 v.val = sk->sk_reuse;
1144 break;
1145
055dc21a
TH		 1146 case SO_REUSEPORT:
1147 v.val = sk->sk_reuseport;
1148 break;
1149
e71a4783 1150 case SO_KEEPALIVE:
1b23a5df 1151 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1152 break;
1153
1154 case SO_TYPE:
1155 v.val = sk->sk_type;
1156 break;
1157
49c794e9
JE		 1158 case SO_PROTOCOL:
1159 v.val = sk->sk_protocol;
1160 break;
1161
0d6038ee
JE		 1162 case SO_DOMAIN:
1163 v.val = sk->sk_family;
1164 break;
1165
e71a4783
SH		 1166 case SO_ERROR:
1167 v.val = -sock_error(sk);
2a91525c 1168 if (v.val == 0)
e71a4783
SH		 1169 v.val = xchg(&sk->sk_err_soft, 0);
1170 break;
1171
1172 case SO_OOBINLINE:
1b23a5df 1173 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1174 break;
1175
1176 case SO_NO_CHECK:
28448b80 1177 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1178 break;
1179
1180 case SO_PRIORITY:
1181 v.val = sk->sk_priority;
1182 break;
1183
1184 case SO_LINGER:
1185 lv = sizeof(v.ling);
1b23a5df 1186 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1187 v.ling.l_linger = sk->sk_lingertime / HZ;
1188 break;
1189
1190 case SO_BSDCOMPAT:
1191 sock_warn_obsolete_bsdism("getsockopt");
1192 break;
1193
1194 case SO_TIMESTAMP:
92f37fd2
ED		 1195 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1196 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1197 break;
1198
1199 case SO_TIMESTAMPNS:
1200 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1201 break;
1202
20d49473 1203 case SO_TIMESTAMPING:
b9f40e21 1204 v.val = sk->sk_tsflags;
20d49473
PO		 1205 break;
1206
e71a4783 1207 case SO_RCVTIMEO:
2a91525c 1208 lv = sizeof(struct timeval);
e71a4783
SH		 1209 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1210 v.tm.tv_sec = 0;
1211 v.tm.tv_usec = 0;
1212 } else {
1213 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
8ccde4c5 1214 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * USEC_PER_SEC) / HZ;
e71a4783
SH		 1215 }
1216 break;
1217
1218 case SO_SNDTIMEO:
2a91525c 1219 lv = sizeof(struct timeval);
e71a4783
SH		 1220 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1221 v.tm.tv_sec = 0;
1222 v.tm.tv_usec = 0;
1223 } else {
1224 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
8ccde4c5 1225 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * USEC_PER_SEC) / HZ;
e71a4783
SH		 1226 }
1227 break;
1da177e4 1228
e71a4783
SH		 1229 case SO_RCVLOWAT:
1230 v.val = sk->sk_rcvlowat;
1231 break;
1da177e4 1232
e71a4783 1233 case SO_SNDLOWAT:
2a91525c 1234 v.val = 1;
e71a4783 1235 break;
1da177e4 1236
e71a4783 1237 case SO_PASSCRED:
82981930 1238 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1239 break;
1da177e4 1240
e71a4783 1241 case SO_PEERCRED:
109f6e39
EB		 1242 {
1243 struct ucred peercred;
1244 if (len > sizeof(peercred))
1245 len = sizeof(peercred);
1246 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1247 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1248 return -EFAULT;
1249 goto lenout;
109f6e39 1250 }
1da177e4 1251
28b5ba2a
DH		 1252 case SO_PEERGROUPS:
1253 {
1254 int ret, n;
1255
1256 if (!sk->sk_peer_cred)
1257 return -ENODATA;
1258
1259 n = sk->sk_peer_cred->group_info->ngroups;
1260 if (len < n * sizeof(gid_t)) {
1261 len = n * sizeof(gid_t);
1262 return put_user(len, optlen) ? -EFAULT : -ERANGE;
1263 }
1264 len = n * sizeof(gid_t);
1265
1266 ret = groups_to_user((gid_t __user *)optval,
1267 sk->sk_peer_cred->group_info);
1268 if (ret)
1269 return ret;
1270 goto lenout;
1271 }
1272
e71a4783
SH		 1273 case SO_PEERNAME:
1274 {
1275 char address[128];
1276
1277 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1278 return -ENOTCONN;
1279 if (lv < len)
1280 return -EINVAL;
1281 if (copy_to_user(optval, address, len))
1282 return -EFAULT;
1283 goto lenout;
1284 }
1da177e4 1285
e71a4783
SH		 1286 /* Dubious BSD thing... Probably nobody even uses it, but
1287 * the UNIX standard wants it for whatever reason... -DaveM
1288 */
1289 case SO_ACCEPTCONN:
1290 v.val = sk->sk_state == TCP_LISTEN;
1291 break;
1da177e4 1292
e71a4783 1293 case SO_PASSSEC:
82981930 1294 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1295 break;
877ce7c1 1296
e71a4783
SH		 1297 case SO_PEERSEC:
1298 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1299
4a19ec58
LAT		 1300 case SO_MARK:
1301 v.val = sk->sk_mark;
1302 break;
1303
3b885787 1304 case SO_RXQ_OVFL:
1b23a5df 1305 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1306 break;
1307
6e3e939f 1308 case SO_WIFI_STATUS:
1b23a5df 1309 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1310 break;
1311
ef64a54f
PE		 1312 case SO_PEEK_OFF:
1313 if (!sock->ops->set_peek_off)
1314 return -EOPNOTSUPP;
1315
1316 v.val = sk->sk_peek_off;
1317 break;
bc2f7996 1318 case SO_NOFCS:
1b23a5df 1319 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1320 break;
c91f6df2 1321
f7b86bfe 1322 case SO_BINDTODEVICE:
c91f6df2
BH		 1323 return sock_getbindtodevice(sk, optval, optlen, len);
1324
a8fc9277
PE		 1325 case SO_GET_FILTER:
1326 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1327 if (len < 0)
1328 return len;
1329
1330 goto lenout;
c91f6df2 1331
d59577b6
VB		 1332 case SO_LOCK_FILTER:
1333 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1334 break;
1335
ea02f941
MS		 1336 case SO_BPF_EXTENSIONS:
1337 v.val = bpf_tell_extensions();
1338 break;
1339
7d4c04fc
KJ		 1340 case SO_SELECT_ERR_QUEUE:
1341 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1342 break;
1343
e0d1095a 1344#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1345 case SO_BUSY_POLL:
dafcc438
ET		 1346 v.val = sk->sk_ll_usec;
1347 break;
1348#endif
1349
62748f32
ED		 1350 case SO_MAX_PACING_RATE:
1351 v.val = sk->sk_max_pacing_rate;
1352 break;
1353
2c8c56e1
ED		 1354 case SO_INCOMING_CPU:
1355 v.val = sk->sk_incoming_cpu;
1356 break;
1357
a2d133b1
JH		 1358 case SO_MEMINFO:
1359 {
1360 u32 meminfo[SK_MEMINFO_VARS];
1361
1362 if (get_user(len, optlen))
1363 return -EFAULT;
1364
1365 sk_get_meminfo(sk, meminfo);
1366
1367 len = min_t(unsigned int, len, sizeof(meminfo));
1368 if (copy_to_user(optval, &meminfo, len))
1369 return -EFAULT;
1370
1371 goto lenout;
1372 }
6d433902
SS		 1373
1374#ifdef CONFIG_NET_RX_BUSY_POLL
1375 case SO_INCOMING_NAPI_ID:
1376 v.val = READ_ONCE(sk->sk_napi_id);
1377
1378 /* aggregate non-NAPI IDs down to 0 */
1379 if (v.val < MIN_NAPI_ID)
1380 v.val = 0;
1381
1382 break;
1383#endif
1384
5daab9db
CF		 1385 case SO_COOKIE:
1386 lv = sizeof(u64);
1387 if (len < lv)
1388 return -EINVAL;
1389 v.val64 = sock_gen_cookie(sk);
1390 break;
1391
76851d12
WB		 1392 case SO_ZEROCOPY:
1393 v.val = sock_flag(sk, SOCK_ZEROCOPY);
1394 break;
1395
e71a4783 1396 default:
443b5991
YH		 1397 /* We implement the SO_SNDLOWAT etc to not be settable
1398 * (1003.1g 7).
1399 */
e71a4783 1400 return -ENOPROTOOPT;
1da177e4 1401 }
e71a4783 1402
1da177e4
LT		 1403 if (len > lv)
1404 len = lv;
1405 if (copy_to_user(optval, &v, len))
1406 return -EFAULT;
1407lenout:
4ec93edb
YH		 1408 if (put_user(len, optlen))
1409 return -EFAULT;
1410 return 0;
1da177e4
LT		 1411}
1412
a5b5bb9a
IM		 1413/*
1414 * Initialize an sk_lock.
1415 *
1416 * (We also register the sk_lock with the lock validator.)
1417 */
b6f99a21 1418static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1419{
cdfbabfb
DH		 1420 if (sk->sk_kern_sock)
1421 sock_lock_init_class_and_name(
1422 sk,
1423 af_family_kern_slock_key_strings[sk->sk_family],
1424 af_family_kern_slock_keys + sk->sk_family,
1425 af_family_kern_key_strings[sk->sk_family],
1426 af_family_kern_keys + sk->sk_family);
1427 else
1428 sock_lock_init_class_and_name(
1429 sk,
ed07536e
PZ		 1430 af_family_slock_key_strings[sk->sk_family],
1431 af_family_slock_keys + sk->sk_family,
1432 af_family_key_strings[sk->sk_family],
1433 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1434}
1435
4dc6dc71
ED		 1436/*
1437 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1438 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1439 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1440 */
f1a6c4da
PE		 1441static void sock_copy(struct sock *nsk, const struct sock *osk)
1442{
1443#ifdef CONFIG_SECURITY_NETWORK
1444 void *sptr = nsk->sk_security;
1445#endif
68835aba
ED		 1446 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1447
1448 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1449 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1450
f1a6c4da
PE		 1451#ifdef CONFIG_SECURITY_NETWORK
1452 nsk->sk_security = sptr;
1453 security_sk_clone(osk, nsk);
1454#endif
1455}
1456
2e4afe7b
PE		 1457static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1458 int family)
c308c1b2
PE		 1459{
1460 struct sock *sk;
1461 struct kmem_cache *slab;
1462
1463 slab = prot->slab;
e912b114
ED		 1464 if (slab != NULL) {
1465 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1466 if (!sk)
1467 return sk;
ba2489b0
ED		 1468 if (priority & __GFP_ZERO)
1469 sk_prot_clear_nulls(sk, prot->obj_size);
fcbdf09d 1470 } else
c308c1b2
PE		 1471 sk = kmalloc(prot->obj_size, priority);
1472
2e4afe7b
PE		 1473 if (sk != NULL) {
1474 if (security_sk_alloc(sk, family, priority))
1475 goto out_free;
1476
1477 if (!try_module_get(prot->owner))
1478 goto out_free_sec;
e022f0b4 1479 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1480 }
1481
c308c1b2 1482 return sk;
2e4afe7b
PE		 1483
1484out_free_sec:
1485 security_sk_free(sk);
1486out_free:
1487 if (slab != NULL)
1488 kmem_cache_free(slab, sk);
1489 else
1490 kfree(sk);
1491 return NULL;
c308c1b2
PE		 1492}
1493
1494static void sk_prot_free(struct proto *prot, struct sock *sk)
1495{
1496 struct kmem_cache *slab;
2e4afe7b 1497 struct module *owner;
c308c1b2 1498
2e4afe7b 1499 owner = prot->owner;
c308c1b2 1500 slab = prot->slab;
2e4afe7b 1501
bd1060a1 1502 cgroup_sk_free(&sk->sk_cgrp_data);
2d758073 1503 mem_cgroup_sk_free(sk);
2e4afe7b 1504 security_sk_free(sk);
c308c1b2
PE		 1505 if (slab != NULL)
1506 kmem_cache_free(slab, sk);
1507 else
1508 kfree(sk);
2e4afe7b 1509 module_put(owner);
c308c1b2
PE		 1510}
1511
1da177e4
LT		 1512/**
1513 * sk_alloc - All socket objects are allocated here
c4ea43c5 1514 * @net: the applicable net namespace
4dc3b16b
PP		 1515 * @family: protocol family
1516 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1517 * @prot: struct proto associated with this new sock instance
11aa9c28 1518 * @kern: is this to be a kernel socket?
1da177e4 1519 */
1b8d7ae4 1520struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
11aa9c28 1521 struct proto *prot, int kern)
1da177e4 1522{
c308c1b2 1523 struct sock *sk;
1da177e4 1524
154adbc8 1525 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1526 if (sk) {
154adbc8
PE		 1527 sk->sk_family = family;
1528 /*
1529 * See comment in struct sock definition to understand
1530 * why we need sk_prot_creator -acme
1531 */
1532 sk->sk_prot = sk->sk_prot_creator = prot;
cdfbabfb 1533 sk->sk_kern_sock = kern;
154adbc8 1534 sock_lock_init(sk);
26abe143 1535 sk->sk_net_refcnt = kern ? 0 : 1;
648845ab 1536 if (likely(sk->sk_net_refcnt)) {
26abe143 1537 get_net(net);
648845ab
TZ		 1538 sock_inuse_add(net, 1);
1539 }
1540
26abe143 1541 sock_net_set(sk, net);
14afee4b 1542 refcount_set(&sk->sk_wmem_alloc, 1);
f8451725 1543
2d758073 1544 mem_cgroup_sk_alloc(sk);
d979a39d 1545 cgroup_sk_alloc(&sk->sk_cgrp_data);
2a56a1fe
TH		 1546 sock_update_classid(&sk->sk_cgrp_data);
1547 sock_update_netprioidx(&sk->sk_cgrp_data);
1da177e4 1548 }
a79af59e 1549
2e4afe7b 1550 return sk;
1da177e4 1551}
2a91525c 1552EXPORT_SYMBOL(sk_alloc);
1da177e4 1553
a4298e45
ED		 1554/* Sockets having SOCK_RCU_FREE will call this function after one RCU
1555 * grace period. This is the case for UDP sockets and TCP listeners.
1556 */
1557static void __sk_destruct(struct rcu_head *head)
1da177e4 1558{
a4298e45 1559 struct sock *sk = container_of(head, struct sock, sk_rcu);
1da177e4 1560 struct sk_filter *filter;
1da177e4
LT		 1561
1562 if (sk->sk_destruct)
1563 sk->sk_destruct(sk);
1564
a898def2 1565 filter = rcu_dereference_check(sk->sk_filter,
14afee4b 1566 refcount_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1567 if (filter) {
309dd5fc 1568 sk_filter_uncharge(sk, filter);
a9b3cd7f 1569 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4 1570 }
538950a1
CG		 1571 if (rcu_access_pointer(sk->sk_reuseport_cb))
1572 reuseport_detach_sock(sk);
1da177e4 1573
08e29af3 1574 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1575
1576 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1577 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1578 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1579
22a0e18e
ED		 1580 if (sk->sk_frag.page) {
1581 put_page(sk->sk_frag.page);
1582 sk->sk_frag.page = NULL;
1583 }
1584
109f6e39
EB		 1585 if (sk->sk_peer_cred)
1586 put_cred(sk->sk_peer_cred);
1587 put_pid(sk->sk_peer_pid);
26abe143
EB		 1588 if (likely(sk->sk_net_refcnt))
1589 put_net(sock_net(sk));
c308c1b2 1590 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1591}
2b85a34e 1592
a4298e45
ED		 1593void sk_destruct(struct sock *sk)
1594{
1595 if (sock_flag(sk, SOCK_RCU_FREE))
1596 call_rcu(&sk->sk_rcu, __sk_destruct);
1597 else
1598 __sk_destruct(&sk->sk_rcu);
1599}
1600
eb4cb008
CG		 1601static void __sk_free(struct sock *sk)
1602{
648845ab
TZ		 1603 if (likely(sk->sk_net_refcnt))
1604 sock_inuse_add(sock_net(sk), -1);
1605
b922622e 1606 if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt))
eb4cb008
CG		 1607 sock_diag_broadcast_destroy(sk);
1608 else
1609 sk_destruct(sk);
1610}
1611
2b85a34e
ED		 1612void sk_free(struct sock *sk)
1613{
1614 /*
25985edc 1615 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1616 * some packets are still in some tx queue.
1617 * If not null, sock_wfree() will call __sk_free(sk) later
1618 */
14afee4b 1619 if (refcount_dec_and_test(&sk->sk_wmem_alloc))
2b85a34e
ED		 1620 __sk_free(sk);
1621}
2a91525c 1622EXPORT_SYMBOL(sk_free);
1da177e4 1623
581319c5
PA		 1624static void sk_init_common(struct sock *sk)
1625{
1626 skb_queue_head_init(&sk->sk_receive_queue);
1627 skb_queue_head_init(&sk->sk_write_queue);
1628 skb_queue_head_init(&sk->sk_error_queue);
1629
1630 rwlock_init(&sk->sk_callback_lock);
1631 lockdep_set_class_and_name(&sk->sk_receive_queue.lock,
1632 af_rlock_keys + sk->sk_family,
1633 af_family_rlock_key_strings[sk->sk_family]);
1634 lockdep_set_class_and_name(&sk->sk_write_queue.lock,
1635 af_wlock_keys + sk->sk_family,
1636 af_family_wlock_key_strings[sk->sk_family]);
1637 lockdep_set_class_and_name(&sk->sk_error_queue.lock,
1638 af_elock_keys + sk->sk_family,
1639 af_family_elock_key_strings[sk->sk_family]);
1640 lockdep_set_class_and_name(&sk->sk_callback_lock,
1641 af_callback_keys + sk->sk_family,
1642 af_family_clock_key_strings[sk->sk_family]);
1643}
1644
e56c57d0
ED		 1645/**
1646 * sk_clone_lock - clone a socket, and lock its clone
1647 * @sk: the socket to clone
1648 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1649 *
1650 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1651 */
1652struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1653{
8fd1d178 1654 struct sock *newsk;
278571ba 1655 bool is_charged = true;
87d11ceb 1656
8fd1d178 1657 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1658 if (newsk != NULL) {
1659 struct sk_filter *filter;
1660
892c141e 1661 sock_copy(newsk, sk);
87d11ceb 1662
9d538fa6
CP		 1663 newsk->sk_prot_creator = sk->sk_prot;
1664
87d11ceb 1665 /* SANITY */
8a681736
SV		 1666 if (likely(newsk->sk_net_refcnt))
1667 get_net(sock_net(newsk));
87d11ceb
ACM		 1668 sk_node_init(&newsk->sk_node);
1669 sock_lock_init(newsk);
1670 bh_lock_sock(newsk);
fa438ccf 1671 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1672 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1673
1674 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1675 /*
1676 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1677 */
14afee4b 1678 refcount_set(&newsk->sk_wmem_alloc, 1);
87d11ceb 1679 atomic_set(&newsk->sk_omem_alloc, 0);
581319c5 1680 sk_init_common(newsk);
87d11ceb
ACM		 1681
1682 newsk->sk_dst_cache = NULL;
9b8805a3 1683 newsk->sk_dst_pending_confirm = 0;
87d11ceb
ACM		 1684 newsk->sk_wmem_queued = 0;
1685 newsk->sk_forward_alloc = 0;
9caad864 1686 atomic_set(&newsk->sk_drops, 0);
87d11ceb 1687 newsk->sk_send_head = NULL;
87d11ceb 1688 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
52267790 1689 atomic_set(&newsk->sk_zckey, 0);
87d11ceb
ACM		 1690
1691 sock_reset_flag(newsk, SOCK_DONE);
edbe69ef 1692 mem_cgroup_sk_alloc(newsk);
c0576e39 1693 cgroup_sk_alloc(&newsk->sk_cgrp_data);
87d11ceb 1694
eefca20e
ED		 1695 rcu_read_lock();
1696 filter = rcu_dereference(sk->sk_filter);
87d11ceb 1697 if (filter != NULL)
278571ba
AS		 1698 /* though it's an empty new sock, the charging may fail
1699 * if sysctl_optmem_max was changed between creation of
1700 * original socket and cloning
1701 */
1702 is_charged = sk_filter_charge(newsk, filter);
eefca20e
ED		 1703 RCU_INIT_POINTER(newsk->sk_filter, filter);
1704 rcu_read_unlock();
87d11ceb 1705
d188ba86 1706 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
a97e50cc
DB		 1707 /* We need to make sure that we don't uncharge the new
1708 * socket if we couldn't charge it in the first place
1709 * as otherwise we uncharge the parent's filter.
1710 */
1711 if (!is_charged)
1712 RCU_INIT_POINTER(newsk->sk_filter, NULL);
94352d45 1713 sk_free_unlock_clone(newsk);
87d11ceb
ACM		 1714 newsk = NULL;
1715 goto out;
1716 }
fa463497 1717 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
87d11ceb
ACM		 1718
1719 newsk->sk_err = 0;
e551c32d 1720 newsk->sk_err_soft = 0;
87d11ceb 1721 newsk->sk_priority = 0;
2c8c56e1 1722 newsk->sk_incoming_cpu = raw_smp_processor_id();
33cf7c90 1723 atomic64_set(&newsk->sk_cookie, 0);
648845ab
TZ		 1724 if (likely(newsk->sk_net_refcnt))
1725 sock_inuse_add(sock_net(newsk), 1);
d979a39d 1726
4dc6dc71
ED		 1727 /*
1728 * Before updating sk_refcnt, we must commit prior changes to memory
1729 * (Documentation/RCU/rculist_nulls.txt for details)
1730 */
1731 smp_wmb();
41c6d650 1732 refcount_set(&newsk->sk_refcnt, 2);
87d11ceb
ACM		 1733
1734 /*
1735 * Increment the counter in the same struct proto as the master
1736 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1737 * is the same as sk->sk_prot->socks, as this field was copied
1738 * with memcpy).
1739 *
1740 * This _changes_ the previous behaviour, where
1741 * tcp_create_openreq_child always was incrementing the
1742 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1743 * to be taken into account in all callers. -acme
1744 */
1745 sk_refcnt_debug_inc(newsk);
972692e0 1746 sk_set_socket(newsk, NULL);
43815482 1747 newsk->sk_wq = NULL;
87d11ceb
ACM		 1748
1749 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1750 sk_sockets_allocated_inc(newsk);
704da560 1751
080a270f
HFS		 1752 if (sock_needs_netstamp(sk) &&
1753 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1754 net_enable_timestamp();
87d11ceb
ACM		 1755 }
1756out:
1757 return newsk;
1758}
e56c57d0 1759EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1760
94352d45
ACM		 1761void sk_free_unlock_clone(struct sock *sk)
1762{
1763 /* It is still raw copy of parent, so invalidate
1764 * destructor and make plain sk_free() */
1765 sk->sk_destruct = NULL;
1766 bh_unlock_sock(sk);
1767 sk_free(sk);
1768}
1769EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
1770
9958089a
AK		 1771void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1772{
d6a4e26a
ED		 1773 u32 max_segs = 1;
1774
6bd4f355 1775 sk_dst_set(sk, dst);
9958089a
AK		 1776 sk->sk_route_caps = dst->dev->features;
1777 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1778 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1779 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1780 if (sk_can_gso(sk)) {
f70f250a 1781 if (dst->header_len && !xfrm_dst_offload_ok(dst)) {
9958089a 1782 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1783 } else {
9958089a 1784 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1785 sk->sk_gso_max_size = dst->dev->gso_max_size;
d6a4e26a 1786 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
82cc1a7a 1787 }
9958089a 1788 }
d6a4e26a 1789 sk->sk_gso_max_segs = max_segs;
9958089a
AK		 1790}
1791EXPORT_SYMBOL_GPL(sk_setup_caps);
1792
1da177e4
LT		 1793/*
1794 * Simple resource managers for sockets.
1795 */
1796
1797
4ec93edb
YH		 1798/*
1799 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1800 */
1801void sock_wfree(struct sk_buff *skb)
1802{
1803 struct sock *sk = skb->sk;
d99927f4 1804 unsigned int len = skb->truesize;
1da177e4 1805
d99927f4
ED		 1806 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1807 /*
1808 * Keep a reference on sk_wmem_alloc, this will be released
1809 * after sk_write_space() call
1810 */
14afee4b 1811 WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc));
1da177e4 1812 sk->sk_write_space(sk);
d99927f4
ED		 1813 len = 1;
1814 }
2b85a34e 1815 /*
d99927f4
ED		 1816 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1817 * could not do because of in-flight packets
2b85a34e 1818 */
14afee4b 1819 if (refcount_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1820 __sk_free(sk);
1da177e4 1821}
2a91525c 1822EXPORT_SYMBOL(sock_wfree);
1da177e4 1823
1d2077ac
ED		 1824/* This variant of sock_wfree() is used by TCP,
1825 * since it sets SOCK_USE_WRITE_QUEUE.
1826 */
1827void __sock_wfree(struct sk_buff *skb)
1828{
1829 struct sock *sk = skb->sk;
1830
14afee4b 1831 if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
1d2077ac
ED		 1832 __sk_free(sk);
1833}
1834
9e17f8a4
ED		 1835void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1836{
1837 skb_orphan(skb);
1838 skb->sk = sk;
1839#ifdef CONFIG_INET
1840 if (unlikely(!sk_fullsock(sk))) {
1841 skb->destructor = sock_edemux;
1842 sock_hold(sk);
1843 return;
1844 }
1845#endif
1846 skb->destructor = sock_wfree;
1847 skb_set_hash_from_sk(skb, sk);
1848 /*
1849 * We used to take a refcount on sk, but following operation
1850 * is enough to guarantee sk_free() wont free this sock until
1851 * all in-flight packets are completed
1852 */
14afee4b 1853 refcount_add(skb->truesize, &sk->sk_wmem_alloc);
9e17f8a4
ED		 1854}
1855EXPORT_SYMBOL(skb_set_owner_w);
1856
1d2077ac
ED		 1857/* This helper is used by netem, as it can hold packets in its
1858 * delay queue. We want to allow the owner socket to send more
1859 * packets, as if they were already TX completed by a typical driver.
1860 * But we also want to keep skb->sk set because some packet schedulers
f6ba8d33 1861 * rely on it (sch_fq for example).
1d2077ac 1862 */
f2f872f9
ED		 1863void skb_orphan_partial(struct sk_buff *skb)
1864{
f6ba8d33 1865 if (skb_is_tcp_pure_ack(skb))
1d2077ac
ED		 1866 return;
1867
f2f872f9
ED		 1868 if (skb->destructor == sock_wfree
1869#ifdef CONFIG_INET
1870 || skb->destructor == tcp_wfree
1871#endif
1872 ) {
f6ba8d33
ED		 1873 struct sock *sk = skb->sk;
1874
41c6d650 1875 if (refcount_inc_not_zero(&sk->sk_refcnt)) {
14afee4b 1876 WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc));
f6ba8d33
ED		 1877 skb->destructor = sock_efree;
1878 }
f2f872f9
ED		 1879 } else {
1880 skb_orphan(skb);
1881 }
1882}
1883EXPORT_SYMBOL(skb_orphan_partial);
1884
4ec93edb
YH		 1885/*
1886 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1887 */
1888void sock_rfree(struct sk_buff *skb)
1889{
1890 struct sock *sk = skb->sk;
d361fd59 1891 unsigned int len = skb->truesize;
1da177e4 1892
d361fd59
ED		 1893 atomic_sub(len, &sk->sk_rmem_alloc);
1894 sk_mem_uncharge(sk, len);
1da177e4 1895}
2a91525c 1896EXPORT_SYMBOL(sock_rfree);
1da177e4 1897
7768eed8
OH		 1898/*
1899 * Buffer destructor for skbs that are not used directly in read or write
1900 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1901 */
62bccb8c
AD		 1902void sock_efree(struct sk_buff *skb)
1903{
1904 sock_put(skb->sk);
1905}
1906EXPORT_SYMBOL(sock_efree);
1907
976d0201 1908kuid_t sock_i_uid(struct sock *sk)
1da177e4 1909{
976d0201 1910 kuid_t uid;
1da177e4 1911
f064af1e 1912 read_lock_bh(&sk->sk_callback_lock);
976d0201 1913 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1914 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1915 return uid;
1916}
2a91525c 1917EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1918
1919unsigned long sock_i_ino(struct sock *sk)
1920{
1921 unsigned long ino;
1922
f064af1e 1923 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1924 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1925 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1926 return ino;
1927}
2a91525c 1928EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1929
1930/*
1931 * Allocate a skb from the socket's send buffer.
1932 */
86a76caf 1933struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1934 gfp_t priority)
1da177e4 1935{
14afee4b 1936 if (force || refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1937 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1938 if (skb) {
1939 skb_set_owner_w(skb, sk);
1940 return skb;
1941 }
1942 }
1943 return NULL;
1944}
2a91525c 1945EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1946
98ba0bd5
WB		 1947static void sock_ofree(struct sk_buff *skb)
1948{
1949 struct sock *sk = skb->sk;
1950
1951 atomic_sub(skb->truesize, &sk->sk_omem_alloc);
1952}
1953
1954struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size,
1955 gfp_t priority)
1956{
1957 struct sk_buff *skb;
1958
1959 /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */
1960 if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) >
1961 sysctl_optmem_max)
1962 return NULL;
1963
1964 skb = alloc_skb(size, priority);
1965 if (!skb)
1966 return NULL;
1967
1968 atomic_add(skb->truesize, &sk->sk_omem_alloc);
1969 skb->sk = sk;
1970 skb->destructor = sock_ofree;
1971 return skb;
1972}
1973
4ec93edb 1974/*
1da177e4 1975 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1976 */
dd0fc66f 1977void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1978{
95c96174 1979 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1980 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1981 void *mem;
1982 /* First do the add, to avoid the race if kmalloc
4ec93edb 1983 * might sleep.
1da177e4
LT		 1984 */
1985 atomic_add(size, &sk->sk_omem_alloc);
1986 mem = kmalloc(size, priority);
1987 if (mem)
1988 return mem;
1989 atomic_sub(size, &sk->sk_omem_alloc);
1990 }
1991 return NULL;
1992}
2a91525c 1993EXPORT_SYMBOL(sock_kmalloc);
1da177e4 1994
79e88659
DB		 1995/* Free an option memory block. Note, we actually want the inline
1996 * here as this allows gcc to detect the nullify and fold away the
1997 * condition entirely.
1da177e4 1998 */
79e88659
DB		 1999static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
2000 const bool nullify)
1da177e4 2001{
e53da5fb
DM		 2002 if (WARN_ON_ONCE(!mem))
2003 return;
79e88659
DB		 2004 if (nullify)
2005 kzfree(mem);
2006 else
2007 kfree(mem);
1da177e4
LT		 2008 atomic_sub(size, &sk->sk_omem_alloc);
2009}
79e88659
DB		 2010
2011void sock_kfree_s(struct sock *sk, void *mem, int size)
2012{
2013 __sock_kfree_s(sk, mem, size, false);
2014}
2a91525c 2015EXPORT_SYMBOL(sock_kfree_s);
1da177e4 2016
79e88659
DB		 2017void sock_kzfree_s(struct sock *sk, void *mem, int size)
2018{
2019 __sock_kfree_s(sk, mem, size, true);
2020}
2021EXPORT_SYMBOL(sock_kzfree_s);
2022
1da177e4
LT		 2023/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
2024 I think, these locks should be removed for datagram sockets.
2025 */
2a91525c 2026static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 2027{
2028 DEFINE_WAIT(wait);
2029
9cd3e072 2030 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1da177e4
LT		 2031 for (;;) {
2032 if (!timeo)
2033 break;
2034 if (signal_pending(current))
2035 break;
2036 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 2037 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
14afee4b 2038 if (refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1da177e4
LT		 2039 break;
2040 if (sk->sk_shutdown & SEND_SHUTDOWN)
2041 break;
2042 if (sk->sk_err)
2043 break;
2044 timeo = schedule_timeout(timeo);
2045 }
aa395145 2046 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 2047 return timeo;
2048}
2049
2050
2051/*
2052 * Generic send/receive buffer handlers
2053 */
2054
4cc7f68d
HX		 2055struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
2056 unsigned long data_len, int noblock,
28d64271 2057 int *errcode, int max_page_order)
1da177e4 2058{
2e4e4410 2059 struct sk_buff *skb;
1da177e4
LT		 2060 long timeo;
2061 int err;
2062
1da177e4 2063 timeo = sock_sndtimeo(sk, noblock);
2e4e4410 2064 for (;;) {
1da177e4
LT		 2065 err = sock_error(sk);
2066 if (err != 0)
2067 goto failure;
2068
2069 err = -EPIPE;
2070 if (sk->sk_shutdown & SEND_SHUTDOWN)
2071 goto failure;
2072
2e4e4410
ED		 2073 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
2074 break;
28d64271 2075
9cd3e072 2076 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2e4e4410
ED		 2077 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2078 err = -EAGAIN;
2079 if (!timeo)
1da177e4 2080 goto failure;
2e4e4410
ED		 2081 if (signal_pending(current))
2082 goto interrupted;
2083 timeo = sock_wait_for_wmem(sk, timeo);
1da177e4 2084 }
2e4e4410
ED		 2085 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
2086 errcode, sk->sk_allocation);
2087 if (skb)
2088 skb_set_owner_w(skb, sk);
1da177e4
LT		 2089 return skb;
2090
2091interrupted:
2092 err = sock_intr_errno(timeo);
2093failure:
2094 *errcode = err;
2095 return NULL;
2096}
4cc7f68d 2097EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 2098
4ec93edb 2099struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 2100 int noblock, int *errcode)
2101{
28d64271 2102 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 2103}
2a91525c 2104EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 2105
39771b12
WB		 2106int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
2107 struct sockcm_cookie *sockc)
2108{
3dd17e63
SHY		 2109 u32 tsflags;
2110
39771b12
WB		 2111 switch (cmsg->cmsg_type) {
2112 case SO_MARK:
2113 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2114 return -EPERM;
2115 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2116 return -EINVAL;
2117 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
2118 break;
3dd17e63
SHY		 2119 case SO_TIMESTAMPING:
2120 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2121 return -EINVAL;
2122
2123 tsflags = *(u32 *)CMSG_DATA(cmsg);
2124 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
2125 return -EINVAL;
2126
2127 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
2128 sockc->tsflags |= tsflags;
2129 break;
779f1ede
SHY		 2130 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
2131 case SCM_RIGHTS:
2132 case SCM_CREDENTIALS:
2133 break;
39771b12
WB		 2134 default:
2135 return -EINVAL;
2136 }
2137 return 0;
2138}
2139EXPORT_SYMBOL(__sock_cmsg_send);
2140
f28ea365
EJ		 2141int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
2142 struct sockcm_cookie *sockc)
2143{
2144 struct cmsghdr *cmsg;
39771b12 2145 int ret;
f28ea365
EJ		 2146
2147 for_each_cmsghdr(cmsg, msg) {
2148 if (!CMSG_OK(msg, cmsg))
2149 return -EINVAL;
2150 if (cmsg->cmsg_level != SOL_SOCKET)
2151 continue;
39771b12
WB		 2152 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
2153 if (ret)
2154 return ret;
f28ea365
EJ		 2155 }
2156 return 0;
2157}
2158EXPORT_SYMBOL(sock_cmsg_send);
2159
06044751
ED		 2160static void sk_enter_memory_pressure(struct sock *sk)
2161{
2162 if (!sk->sk_prot->enter_memory_pressure)
2163 return;
2164
2165 sk->sk_prot->enter_memory_pressure(sk);
2166}
2167
2168static void sk_leave_memory_pressure(struct sock *sk)
2169{
2170 if (sk->sk_prot->leave_memory_pressure) {
2171 sk->sk_prot->leave_memory_pressure(sk);
2172 } else {
2173 unsigned long *memory_pressure = sk->sk_prot->memory_pressure;
2174
2175 if (memory_pressure && *memory_pressure)
2176 *memory_pressure = 0;
2177 }
2178}
2179
5640f768
ED		 2180/* On 32bit arches, an skb frag is limited to 2^15 */
2181#define SKB_FRAG_PAGE_ORDER get_order(32768)
2182
400dfd3a
ED		 2183/**
2184 * skb_page_frag_refill - check that a page_frag contains enough room
2185 * @sz: minimum size of the fragment we want to get
2186 * @pfrag: pointer to page_frag
82d5e2b8 2187 * @gfp: priority for memory allocation
400dfd3a
ED		 2188 *
2189 * Note: While this allocator tries to use high order pages, there is
2190 * no guarantee that allocations succeed. Therefore, @sz MUST be
2191 * less or equal than PAGE_SIZE.
2192 */
d9b2938a 2193bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 2194{
5640f768 2195 if (pfrag->page) {
fe896d18 2196 if (page_ref_count(pfrag->page) == 1) {
5640f768
ED		 2197 pfrag->offset = 0;
2198 return true;
2199 }
400dfd3a 2200 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 2201 return true;
2202 put_page(pfrag->page);
2203 }
2204
d9b2938a
ED		 2205 pfrag->offset = 0;
2206 if (SKB_FRAG_PAGE_ORDER) {
d0164adc
MG		 2207 /* Avoid direct reclaim but allow kswapd to wake */
2208 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
2209 __GFP_COMP | __GFP_NOWARN |
2210 __GFP_NORETRY,
d9b2938a 2211 SKB_FRAG_PAGE_ORDER);
5640f768 2212 if (likely(pfrag->page)) {
d9b2938a 2213 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 2214 return true;
2215 }
d9b2938a
ED		 2216 }
2217 pfrag->page = alloc_page(gfp);
2218 if (likely(pfrag->page)) {
2219 pfrag->size = PAGE_SIZE;
2220 return true;
2221 }
400dfd3a
ED		 2222 return false;
2223}
2224EXPORT_SYMBOL(skb_page_frag_refill);
2225
2226bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2227{
2228 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2229 return true;
2230
5640f768
ED		 2231 sk_enter_memory_pressure(sk);
2232 sk_stream_moderate_sndbuf(sk);
2233 return false;
2234}
2235EXPORT_SYMBOL(sk_page_frag_refill);
2236
1da177e4 2237static void __lock_sock(struct sock *sk)
f39234d6
NK		 2238 __releases(&sk->sk_lock.slock)
2239 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 2240{
2241 DEFINE_WAIT(wait);
2242
e71a4783 2243 for (;;) {
1da177e4
LT		 2244 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2245 TASK_UNINTERRUPTIBLE);
2246 spin_unlock_bh(&sk->sk_lock.slock);
2247 schedule();
2248 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 2249 if (!sock_owned_by_user(sk))
1da177e4
LT		 2250 break;
2251 }
2252 finish_wait(&sk->sk_lock.wq, &wait);
2253}
2254
2255static void __release_sock(struct sock *sk)
f39234d6
NK		 2256 __releases(&sk->sk_lock.slock)
2257 __acquires(&sk->sk_lock.slock)
1da177e4 2258{
5413d1ba 2259 struct sk_buff *skb, *next;
1da177e4 2260
5413d1ba 2261 while ((skb = sk->sk_backlog.head) != NULL) {
1da177e4 2262 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1da177e4 2263
5413d1ba 2264 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4 2265
5413d1ba
ED		 2266 do {
2267 next = skb->next;
e4cbb02a 2268 prefetch(next);
7fee226a 2269 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 2270 skb->next = NULL;
c57943a1 2271 sk_backlog_rcv(sk, skb);
1da177e4 2272
5413d1ba 2273 cond_resched();
1da177e4
LT		 2274
2275 skb = next;
2276 } while (skb != NULL);
2277
5413d1ba
ED		 2278 spin_lock_bh(&sk->sk_lock.slock);
2279 }
8eae939f
ZY		 2280
2281 /*
2282 * Doing the zeroing here guarantee we can not loop forever
2283 * while a wild producer attempts to flood us.
2284 */
2285 sk->sk_backlog.len = 0;
1da177e4
LT		 2286}
2287
d41a69f1
ED		 2288void __sk_flush_backlog(struct sock *sk)
2289{
2290 spin_lock_bh(&sk->sk_lock.slock);
2291 __release_sock(sk);
2292 spin_unlock_bh(&sk->sk_lock.slock);
2293}
2294
1da177e4
LT		 2295/**
2296 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 2297 * @sk: sock to wait on
2298 * @timeo: for how long
dfbafc99 2299 * @skb: last skb seen on sk_receive_queue
1da177e4
LT		 2300 *
2301 * Now socket state including sk->sk_err is changed only under lock,
2302 * hence we may omit checks after joining wait queue.
2303 * We check receive queue before schedule() only as optimization;
2304 * it is very likely that release_sock() added new data.
2305 */
dfbafc99 2306int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
1da177e4 2307{
d9dc8b0f 2308 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1da177e4 2309 int rc;
1da177e4 2310
d9dc8b0f 2311 add_wait_queue(sk_sleep(sk), &wait);
9cd3e072 2312 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
d9dc8b0f 2313 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
9cd3e072 2314 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
d9dc8b0f 2315 remove_wait_queue(sk_sleep(sk), &wait);
1da177e4
LT		 2316 return rc;
2317}
1da177e4
LT		 2318EXPORT_SYMBOL(sk_wait_data);
2319
3ab224be 2320/**
f8c3bf00 2321 * __sk_mem_raise_allocated - increase memory_allocated
3ab224be
HA		 2322 * @sk: socket
2323 * @size: memory size to allocate
f8c3bf00 2324 * @amt: pages to allocate
3ab224be
HA		 2325 * @kind: allocation type
2326 *
f8c3bf00 2327 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc
3ab224be 2328 */
f8c3bf00 2329int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
3ab224be
HA		 2330{
2331 struct proto *prot = sk->sk_prot;
f8c3bf00 2332 long allocated = sk_memory_allocated_add(sk, amt);
e805605c 2333
baac50bb
JW		 2334 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2335 !mem_cgroup_charge_skmem(sk->sk_memcg, amt))
e805605c 2336 goto suppress_allocation;
3ab224be
HA		 2337
2338 /* Under limit. */
e805605c 2339 if (allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2340 sk_leave_memory_pressure(sk);
3ab224be
HA		 2341 return 1;
2342 }
2343
e805605c
JW		 2344 /* Under pressure. */
2345 if (allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2346 sk_enter_memory_pressure(sk);
3ab224be 2347
e805605c
JW		 2348 /* Over hard limit. */
2349 if (allocated > sk_prot_mem_limits(sk, 2))
3ab224be
HA		 2350 goto suppress_allocation;
2351
2352 /* guarantee minimum buffer size under pressure */
2353 if (kind == SK_MEM_RECV) {
a3dcaf17 2354 if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot))
3ab224be 2355 return 1;
180d8cd9 2356
3ab224be 2357 } else { /* SK_MEM_SEND */
a3dcaf17
ED		 2358 int wmem0 = sk_get_wmem0(sk, prot);
2359
3ab224be 2360 if (sk->sk_type == SOCK_STREAM) {
a3dcaf17 2361 if (sk->sk_wmem_queued < wmem0)
3ab224be 2362 return 1;
a3dcaf17 2363 } else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) {
3ab224be 2364 return 1;
a3dcaf17 2365 }
3ab224be
HA		 2366 }
2367
180d8cd9 2368 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2369 int alloc;
2370
180d8cd9 2371 if (!sk_under_memory_pressure(sk))
1748376b 2372 return 1;
180d8cd9
GC		 2373 alloc = sk_sockets_allocated_read_positive(sk);
2374 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2375 sk_mem_pages(sk->sk_wmem_queued +
2376 atomic_read(&sk->sk_rmem_alloc) +
2377 sk->sk_forward_alloc))
2378 return 1;
2379 }
2380
2381suppress_allocation:
2382
2383 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2384 sk_stream_moderate_sndbuf(sk);
2385
2386 /* Fail only if socket is _under_ its sndbuf.
2387 * In this case we cannot block, so that we have to fail.
2388 */
2389 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2390 return 1;
2391 }
2392
3847ce32
SM		 2393 trace_sock_exceed_buf_limit(sk, prot, allocated);
2394
0e90b31f 2395 sk_memory_allocated_sub(sk, amt);
180d8cd9 2396
baac50bb
JW		 2397 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2398 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
e805605c 2399
3ab224be
HA		 2400 return 0;
2401}
f8c3bf00
PA		 2402EXPORT_SYMBOL(__sk_mem_raise_allocated);
2403
2404/**
2405 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2406 * @sk: socket
2407 * @size: memory size to allocate
2408 * @kind: allocation type
2409 *
2410 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2411 * rmem allocation. This function assumes that protocols which have
2412 * memory_pressure use sk_wmem_queued as write buffer accounting.
2413 */
2414int __sk_mem_schedule(struct sock *sk, int size, int kind)
2415{
2416 int ret, amt = sk_mem_pages(size);
2417
2418 sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT;
2419 ret = __sk_mem_raise_allocated(sk, size, amt, kind);
2420 if (!ret)
2421 sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT;
2422 return ret;
2423}
3ab224be
HA		 2424EXPORT_SYMBOL(__sk_mem_schedule);
2425
2426/**
f8c3bf00 2427 * __sk_mem_reduce_allocated - reclaim memory_allocated
3ab224be 2428 * @sk: socket
f8c3bf00
PA		 2429 * @amount: number of quanta
2430 *
2431 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
3ab224be 2432 */
f8c3bf00 2433void __sk_mem_reduce_allocated(struct sock *sk, int amount)
3ab224be 2434{
1a24e04e 2435 sk_memory_allocated_sub(sk, amount);
3ab224be 2436
baac50bb
JW		 2437 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2438 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
e805605c 2439
180d8cd9
GC		 2440 if (sk_under_memory_pressure(sk) &&
2441 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2442 sk_leave_memory_pressure(sk);
3ab224be 2443}
f8c3bf00
PA		 2444EXPORT_SYMBOL(__sk_mem_reduce_allocated);
2445
2446/**
2447 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
2448 * @sk: socket
2449 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
2450 */
2451void __sk_mem_reclaim(struct sock *sk, int amount)
2452{
2453 amount >>= SK_MEM_QUANTUM_SHIFT;
2454 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
2455 __sk_mem_reduce_allocated(sk, amount);
2456}
3ab224be
HA		 2457EXPORT_SYMBOL(__sk_mem_reclaim);
2458
627d2d6b 2459int sk_set_peek_off(struct sock *sk, int val)
2460{
627d2d6b 2461 sk->sk_peek_off = val;
2462 return 0;
2463}
2464EXPORT_SYMBOL_GPL(sk_set_peek_off);
3ab224be 2465
1da177e4
LT		 2466/*
2467 * Set of default routines for initialising struct proto_ops when
2468 * the protocol does not support a particular function. In certain
2469 * cases where it makes no sense for a protocol to have a "do nothing"
2470 * function, some default processing is provided.
2471 */
2472
2473int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2474{
2475 return -EOPNOTSUPP;
2476}
2a91525c 2477EXPORT_SYMBOL(sock_no_bind);
1da177e4 2478
4ec93edb 2479int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2480 int len, int flags)
2481{
2482 return -EOPNOTSUPP;
2483}
2a91525c 2484EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2485
2486int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2487{
2488 return -EOPNOTSUPP;
2489}
2a91525c 2490EXPORT_SYMBOL(sock_no_socketpair);
1da177e4 2491
cdfbabfb
DH		 2492int sock_no_accept(struct socket *sock, struct socket *newsock, int flags,
2493 bool kern)
1da177e4
LT		 2494{
2495 return -EOPNOTSUPP;
2496}
2a91525c 2497EXPORT_SYMBOL(sock_no_accept);
1da177e4 2498
4ec93edb 2499int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2500 int *len, int peer)
2501{
2502 return -EOPNOTSUPP;
2503}
2a91525c 2504EXPORT_SYMBOL(sock_no_getname);
1da177e4 2505
ade994f4 2506__poll_t sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2507{
2508 return 0;
2509}
2a91525c 2510EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2511
2512int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2513{
2514 return -EOPNOTSUPP;
2515}
2a91525c 2516EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2517
2518int sock_no_listen(struct socket *sock, int backlog)
2519{
2520 return -EOPNOTSUPP;
2521}
2a91525c 2522EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2523
2524int sock_no_shutdown(struct socket *sock, int how)
2525{
2526 return -EOPNOTSUPP;
2527}
2a91525c 2528EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2529
2530int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2531 char __user *optval, unsigned int optlen)
1da177e4
LT		 2532{
2533 return -EOPNOTSUPP;
2534}
2a91525c 2535EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2536
2537int sock_no_getsockopt(struct socket *sock, int level, int optname,
2538 char __user *optval, int __user *optlen)
2539{
2540 return -EOPNOTSUPP;
2541}
2a91525c 2542EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4 2543
1b784140 2544int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
1da177e4
LT		 2545{
2546 return -EOPNOTSUPP;
2547}
2a91525c 2548EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4 2549
306b13eb
TH		 2550int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len)
2551{
2552 return -EOPNOTSUPP;
2553}
2554EXPORT_SYMBOL(sock_no_sendmsg_locked);
2555
1b784140
YX		 2556int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2557 int flags)
1da177e4
LT		 2558{
2559 return -EOPNOTSUPP;
2560}
2a91525c 2561EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2562
2563int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2564{
2565 /* Mirror missing mmap method error code */
2566 return -ENODEV;
2567}
2a91525c 2568EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2569
2570ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2571{
2572 ssize_t res;
2573 struct msghdr msg = {.msg_flags = flags};
2574 struct kvec iov;
2575 char *kaddr = kmap(page);
2576 iov.iov_base = kaddr + offset;
2577 iov.iov_len = size;
2578 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2579 kunmap(page);
2580 return res;
2581}
2a91525c 2582EXPORT_SYMBOL(sock_no_sendpage);
1da177e4 2583
306b13eb
TH		 2584ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page,
2585 int offset, size_t size, int flags)
2586{
2587 ssize_t res;
2588 struct msghdr msg = {.msg_flags = flags};
2589 struct kvec iov;
2590 char *kaddr = kmap(page);
2591
2592 iov.iov_base = kaddr + offset;
2593 iov.iov_len = size;
2594 res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size);
2595 kunmap(page);
2596 return res;
2597}
2598EXPORT_SYMBOL(sock_no_sendpage_locked);
2599
1da177e4
LT		 2600/*
2601 * Default Socket Callbacks
2602 */
2603
2604static void sock_def_wakeup(struct sock *sk)
2605{
43815482
ED		 2606 struct socket_wq *wq;
2607
2608 rcu_read_lock();
2609 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2610 if (skwq_has_sleeper(wq))
43815482
ED		 2611 wake_up_interruptible_all(&wq->wait);
2612 rcu_read_unlock();
1da177e4
LT		 2613}
2614
2615static void sock_def_error_report(struct sock *sk)
2616{
43815482
ED		 2617 struct socket_wq *wq;
2618
2619 rcu_read_lock();
2620 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2621 if (skwq_has_sleeper(wq))
a9a08845 2622 wake_up_interruptible_poll(&wq->wait, EPOLLERR);
8d8ad9d7 2623 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2624 rcu_read_unlock();
1da177e4
LT		 2625}
2626
676d2369 2627static void sock_def_readable(struct sock *sk)
1da177e4 2628{
43815482
ED		 2629 struct socket_wq *wq;
2630
2631 rcu_read_lock();
2632 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2633 if (skwq_has_sleeper(wq))
a9a08845
LT		 2634 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
2635 EPOLLRDNORM | EPOLLRDBAND);
8d8ad9d7 2636 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2637 rcu_read_unlock();
1da177e4
LT		 2638}
2639
2640static void sock_def_write_space(struct sock *sk)
2641{
43815482
ED		 2642 struct socket_wq *wq;
2643
2644 rcu_read_lock();
1da177e4
LT		 2645
2646 /* Do not wake up a writer until he can make "significant"
2647 * progress. --DaveM
2648 */
14afee4b 2649 if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482 2650 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2651 if (skwq_has_sleeper(wq))
a9a08845
LT		 2652 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2653 EPOLLWRNORM | EPOLLWRBAND);
1da177e4
LT		 2654
2655 /* Should agree with poll, otherwise some programs break */
2656 if (sock_writeable(sk))
8d8ad9d7 2657 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2658 }
2659
43815482 2660 rcu_read_unlock();
1da177e4
LT		 2661}
2662
2663static void sock_def_destruct(struct sock *sk)
2664{
1da177e4
LT		 2665}
2666
2667void sk_send_sigurg(struct sock *sk)
2668{
2669 if (sk->sk_socket && sk->sk_socket->file)
2670 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2671 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2672}
2a91525c 2673EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2674
2675void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2676 unsigned long expires)
2677{
2678 if (!mod_timer(timer, expires))
2679 sock_hold(sk);
2680}
1da177e4
LT		 2681EXPORT_SYMBOL(sk_reset_timer);
2682
2683void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2684{
25cc4ae9 2685 if (del_timer(timer))
1da177e4
LT		 2686 __sock_put(sk);
2687}
1da177e4
LT		 2688EXPORT_SYMBOL(sk_stop_timer);
2689
2690void sock_init_data(struct socket *sock, struct sock *sk)
2691{
581319c5 2692 sk_init_common(sk);
1da177e4
LT		 2693 sk->sk_send_head = NULL;
2694
99767f27 2695 timer_setup(&sk->sk_timer, NULL, 0);
4ec93edb 2696
1da177e4
LT		 2697 sk->sk_allocation = GFP_KERNEL;
2698 sk->sk_rcvbuf = sysctl_rmem_default;
2699 sk->sk_sndbuf = sysctl_wmem_default;
2700 sk->sk_state = TCP_CLOSE;
972692e0 2701 sk_set_socket(sk, sock);
1da177e4
LT		 2702
2703 sock_set_flag(sk, SOCK_ZAPPED);
2704
e71a4783 2705 if (sock) {
1da177e4 2706 sk->sk_type = sock->type;
43815482 2707 sk->sk_wq = sock->wq;
1da177e4 2708 sock->sk = sk;
86741ec2
LC		 2709 sk->sk_uid = SOCK_INODE(sock)->i_uid;
2710 } else {
43815482 2711 sk->sk_wq = NULL;
86741ec2
LC		 2712 sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0);
2713 }
1da177e4 2714
1da177e4 2715 rwlock_init(&sk->sk_callback_lock);
cdfbabfb
DH		 2716 if (sk->sk_kern_sock)
2717 lockdep_set_class_and_name(
2718 &sk->sk_callback_lock,
2719 af_kern_callback_keys + sk->sk_family,
2720 af_family_kern_clock_key_strings[sk->sk_family]);
2721 else
2722 lockdep_set_class_and_name(
2723 &sk->sk_callback_lock,
443aef0e
PZ		 2724 af_callback_keys + sk->sk_family,
2725 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2726
2727 sk->sk_state_change = sock_def_wakeup;
2728 sk->sk_data_ready = sock_def_readable;
2729 sk->sk_write_space = sock_def_write_space;
2730 sk->sk_error_report = sock_def_error_report;
2731 sk->sk_destruct = sock_def_destruct;
2732
5640f768
ED		 2733 sk->sk_frag.page = NULL;
2734 sk->sk_frag.offset = 0;
ef64a54f 2735 sk->sk_peek_off = -1;
1da177e4 2736
109f6e39
EB		 2737 sk->sk_peer_pid = NULL;
2738 sk->sk_peer_cred = NULL;
1da177e4
LT		 2739 sk->sk_write_pending = 0;
2740 sk->sk_rcvlowat = 1;
2741 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2742 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2743
6c7c98ba 2744 sk->sk_stamp = SK_DEFAULT_STAMP;
52267790 2745 atomic_set(&sk->sk_zckey, 0);
1da177e4 2746
e0d1095a 2747#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2748 sk->sk_napi_id = 0;
64b0dc51 2749 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2750#endif
2751
62748f32 2752 sk->sk_max_pacing_rate = ~0U;
7eec4174 2753 sk->sk_pacing_rate = ~0U;
3a9b76fd 2754 sk->sk_pacing_shift = 10;
70da268b 2755 sk->sk_incoming_cpu = -1;
4dc6dc71
ED		 2756 /*
2757 * Before updating sk_refcnt, we must commit prior changes to memory
2758 * (Documentation/RCU/rculist_nulls.txt for details)
2759 */
2760 smp_wmb();
41c6d650 2761 refcount_set(&sk->sk_refcnt, 1);
33c732c3 2762 atomic_set(&sk->sk_drops, 0);
1da177e4 2763}
2a91525c 2764EXPORT_SYMBOL(sock_init_data);
1da177e4 2765
b5606c2d 2766void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2767{
2768 might_sleep();
a5b5bb9a 2769 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2770 if (sk->sk_lock.owned)
1da177e4 2771 __lock_sock(sk);
d2e9117c 2772 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2773 spin_unlock(&sk->sk_lock.slock);
2774 /*
2775 * The sk_lock has mutex_lock() semantics here:
2776 */
fcc70d5f 2777 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2778 local_bh_enable();
1da177e4 2779}
fcc70d5f 2780EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2781
b5606c2d 2782void release_sock(struct sock *sk)
1da177e4 2783{
a5b5bb9a 2784 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2785 if (sk->sk_backlog.tail)
2786 __release_sock(sk);
46d3ceab 2787
c3f9b018
ED		 2788 /* Warning : release_cb() might need to release sk ownership,
2789 * ie call sock_release_ownership(sk) before us.
2790 */
46d3ceab
ED		 2791 if (sk->sk_prot->release_cb)
2792 sk->sk_prot->release_cb(sk);
2793
c3f9b018 2794 sock_release_ownership(sk);
a5b5bb9a
IM		 2795 if (waitqueue_active(&sk->sk_lock.wq))
2796 wake_up(&sk->sk_lock.wq);
2797 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2798}
2799EXPORT_SYMBOL(release_sock);
2800
8a74ad60
ED		 2801/**
2802 * lock_sock_fast - fast version of lock_sock
2803 * @sk: socket
2804 *
2805 * This version should be used for very small section, where process wont block
d651983d
MCC		 2806 * return false if fast path is taken:
2807 *
8a74ad60 2808 * sk_lock.slock locked, owned = 0, BH disabled
d651983d
MCC		 2809 *
2810 * return true if slow path is taken:
2811 *
8a74ad60
ED		 2812 * sk_lock.slock unlocked, owned = 1, BH enabled
2813 */
2814bool lock_sock_fast(struct sock *sk)
2815{
2816 might_sleep();
2817 spin_lock_bh(&sk->sk_lock.slock);
2818
2819 if (!sk->sk_lock.owned)
2820 /*
2821 * Note : We must disable BH
2822 */
2823 return false;
2824
2825 __lock_sock(sk);
2826 sk->sk_lock.owned = 1;
2827 spin_unlock(&sk->sk_lock.slock);
2828 /*
2829 * The sk_lock has mutex_lock() semantics here:
2830 */
2831 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2832 local_bh_enable();
2833 return true;
2834}
2835EXPORT_SYMBOL(lock_sock_fast);
2836
1da177e4 2837int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2838{
b7aa0bf7 2839 struct timeval tv;
1da177e4 2840 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2841 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2842 tv = ktime_to_timeval(sk->sk_stamp);
2843 if (tv.tv_sec == -1)
1da177e4 2844 return -ENOENT;
b7aa0bf7
ED		 2845 if (tv.tv_sec == 0) {
2846 sk->sk_stamp = ktime_get_real();
2847 tv = ktime_to_timeval(sk->sk_stamp);
2848 }
2849 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2850}
1da177e4
LT		 2851EXPORT_SYMBOL(sock_get_timestamp);
2852
ae40eb1e
ED		 2853int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2854{
2855 struct timespec ts;
2856 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2857 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2858 ts = ktime_to_timespec(sk->sk_stamp);
2859 if (ts.tv_sec == -1)
2860 return -ENOENT;
2861 if (ts.tv_sec == 0) {
2862 sk->sk_stamp = ktime_get_real();
2863 ts = ktime_to_timespec(sk->sk_stamp);
2864 }
2865 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2866}
2867EXPORT_SYMBOL(sock_get_timestampns);
2868
20d49473 2869void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2870{
20d49473 2871 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2872 unsigned long previous_flags = sk->sk_flags;
2873
20d49473
PO		 2874 sock_set_flag(sk, flag);
2875 /*
2876 * we just set one of the two flags which require net
2877 * time stamping, but time stamping might have been on
2878 * already because of the other one
2879 */
080a270f
HFS		 2880 if (sock_needs_netstamp(sk) &&
2881 !(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2882 net_enable_timestamp();
1da177e4
LT		 2883 }
2884}
1da177e4 2885
cb820f8e
RC		 2886int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2887 int level, int type)
2888{
2889 struct sock_exterr_skb *serr;
364a9e93 2890 struct sk_buff *skb;
cb820f8e
RC		 2891 int copied, err;
2892
2893 err = -EAGAIN;
364a9e93 2894 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 2895 if (skb == NULL)
2896 goto out;
2897
2898 copied = skb->len;
2899 if (copied > len) {
2900 msg->msg_flags |= MSG_TRUNC;
2901 copied = len;
2902 }
51f3d02b 2903 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 2904 if (err)
2905 goto out_free_skb;
2906
2907 sock_recv_timestamp(msg, sk, skb);
2908
2909 serr = SKB_EXT_ERR(skb);
2910 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2911
2912 msg->msg_flags |= MSG_ERRQUEUE;
2913 err = copied;
2914
cb820f8e
RC		 2915out_free_skb:
2916 kfree_skb(skb);
2917out:
2918 return err;
2919}
2920EXPORT_SYMBOL(sock_recv_errqueue);
2921
1da177e4
LT		 2922/*
2923 * Get a socket option on an socket.
2924 *
2925 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2926 * asynchronous errors should be reported by getsockopt. We assume
2927 * this means if you specify SO_ERROR (otherwise whats the point of it).
2928 */
2929int sock_common_getsockopt(struct socket *sock, int level, int optname,
2930 char __user *optval, int __user *optlen)
2931{
2932 struct sock *sk = sock->sk;
2933
2934 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2935}
1da177e4
LT		 2936EXPORT_SYMBOL(sock_common_getsockopt);
2937
3fdadf7d 2938#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2939int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2940 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2941{
2942 struct sock *sk = sock->sk;
2943
1e51f951 2944 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2945 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2946 optval, optlen);
3fdadf7d
DM		 2947 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2948}
2949EXPORT_SYMBOL(compat_sock_common_getsockopt);
2950#endif
2951
1b784140
YX		 2952int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2953 int flags)
1da177e4
LT		 2954{
2955 struct sock *sk = sock->sk;
2956 int addr_len = 0;
2957 int err;
2958
1b784140 2959 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
1da177e4
LT		 2960 flags & ~MSG_DONTWAIT, &addr_len);
2961 if (err >= 0)
2962 msg->msg_namelen = addr_len;
2963 return err;
2964}
1da177e4
LT		 2965EXPORT_SYMBOL(sock_common_recvmsg);
2966
2967/*
2968 * Set socket options on an inet socket.
2969 */
2970int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2971 char __user *optval, unsigned int optlen)
1da177e4
LT		 2972{
2973 struct sock *sk = sock->sk;
2974
2975 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2976}
1da177e4
LT		 2977EXPORT_SYMBOL(sock_common_setsockopt);
2978
3fdadf7d 2979#ifdef CONFIG_COMPAT
543d9cfe 2980int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2981 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2982{
2983 struct sock *sk = sock->sk;
2984
543d9cfe
ACM		 2985 if (sk->sk_prot->compat_setsockopt != NULL)
2986 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2987 optval, optlen);
3fdadf7d
DM		 2988 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2989}
2990EXPORT_SYMBOL(compat_sock_common_setsockopt);
2991#endif
2992
1da177e4
LT		 2993void sk_common_release(struct sock *sk)
2994{
2995 if (sk->sk_prot->destroy)
2996 sk->sk_prot->destroy(sk);
2997
2998 /*
2999 * Observation: when sock_common_release is called, processes have
3000 * no access to socket. But net still has.
3001 * Step one, detach it from networking:
3002 *
3003 * A. Remove from hash tables.
3004 */
3005
3006 sk->sk_prot->unhash(sk);
3007
3008 /*
3009 * In this point socket cannot receive new packets, but it is possible
3010 * that some packets are in flight because some CPU runs receiver and
3011 * did hash table lookup before we unhashed socket. They will achieve
3012 * receive queue and will be purged by socket destructor.
3013 *
3014 * Also we still have packets pending on receive queue and probably,
3015 * our own packets waiting in device queues. sock_destroy will drain
3016 * receive queue, but transmitted packets will delay socket destruction
3017 * until the last reference will be released.
3018 */
3019
3020 sock_orphan(sk);
3021
3022 xfrm_sk_free_policy(sk);
3023
e6848976 3024 sk_refcnt_debug_release(sk);
5640f768 3025
1da177e4
LT		 3026 sock_put(sk);
3027}
1da177e4
LT		 3028EXPORT_SYMBOL(sk_common_release);
3029
a2d133b1
JH		 3030void sk_get_meminfo(const struct sock *sk, u32 *mem)
3031{
3032 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
3033
3034 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
3035 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
3036 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
3037 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
3038 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
3039 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
3040 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
3041 mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
3042 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
3043}
3044
13ff3d6f
PE		 3045#ifdef CONFIG_PROC_FS
3046#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 3047struct prot_inuse {
3048 int val[PROTO_INUSE_NR];
3049};
13ff3d6f
PE		 3050
3051static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159 3052
70ee1159
PE		 3053void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
3054{
08fc7f81 3055 __this_cpu_add(net->core.prot_inuse->val[prot->inuse_idx], val);
70ee1159
PE		 3056}
3057EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
3058
3059int sock_prot_inuse_get(struct net *net, struct proto *prot)
3060{
3061 int cpu, idx = prot->inuse_idx;
3062 int res = 0;
3063
3064 for_each_possible_cpu(cpu)
08fc7f81 3065 res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx];
70ee1159
PE		 3066
3067 return res >= 0 ? res : 0;
3068}
3069EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
3070
648845ab
TZ		 3071static void sock_inuse_add(struct net *net, int val)
3072{
3073 this_cpu_add(*net->core.sock_inuse, val);
3074}
3075
3076int sock_inuse_get(struct net *net)
3077{
3078 int cpu, res = 0;
3079
3080 for_each_possible_cpu(cpu)
3081 res += *per_cpu_ptr(net->core.sock_inuse, cpu);
3082
3083 return res;
3084}
3085
3086EXPORT_SYMBOL_GPL(sock_inuse_get);
3087
2c8c1e72 3088static int __net_init sock_inuse_init_net(struct net *net)
70ee1159 3089{
08fc7f81 3090 net->core.prot_inuse = alloc_percpu(struct prot_inuse);
648845ab
TZ		 3091 if (net->core.prot_inuse == NULL)
3092 return -ENOMEM;
3093
3094 net->core.sock_inuse = alloc_percpu(int);
3095 if (net->core.sock_inuse == NULL)
3096 goto out;
3097
3098 return 0;
3099
3100out:
3101 free_percpu(net->core.prot_inuse);
3102 return -ENOMEM;
70ee1159
PE		 3103}
3104
2c8c1e72 3105static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159 3106{
08fc7f81 3107 free_percpu(net->core.prot_inuse);
648845ab 3108 free_percpu(net->core.sock_inuse);
70ee1159
PE		 3109}
3110
3111static struct pernet_operations net_inuse_ops = {
3112 .init = sock_inuse_init_net,
3113 .exit = sock_inuse_exit_net,
3114};
3115
3116static __init int net_inuse_init(void)
3117{
3118 if (register_pernet_subsys(&net_inuse_ops))
3119 panic("Cannot initialize net inuse counters");
3120
3121 return 0;
3122}
3123
3124core_initcall(net_inuse_init);
13ff3d6f
PE		 3125
3126static void assign_proto_idx(struct proto *prot)
3127{
3128 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
3129
3130 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 3131 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 3132 return;
3133 }
3134
3135 set_bit(prot->inuse_idx, proto_inuse_idx);
3136}
3137
3138static void release_proto_idx(struct proto *prot)
3139{
3140 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
3141 clear_bit(prot->inuse_idx, proto_inuse_idx);
3142}
3143#else
3144static inline void assign_proto_idx(struct proto *prot)
3145{
3146}
3147
3148static inline void release_proto_idx(struct proto *prot)
3149{
3150}
648845ab
TZ		 3151
3152static void sock_inuse_add(struct net *net, int val)
3153{
3154}
13ff3d6f
PE		 3155#endif
3156
0159dfd3
ED		 3157static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
3158{
3159 if (!rsk_prot)
3160 return;
3161 kfree(rsk_prot->slab_name);
3162 rsk_prot->slab_name = NULL;
adf78eda
JL		 3163 kmem_cache_destroy(rsk_prot->slab);
3164 rsk_prot->slab = NULL;
0159dfd3
ED		 3165}
3166
3167static int req_prot_init(const struct proto *prot)
3168{
3169 struct request_sock_ops *rsk_prot = prot->rsk_prot;
3170
3171 if (!rsk_prot)
3172 return 0;
3173
3174 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
3175 prot->name);
3176 if (!rsk_prot->slab_name)
3177 return -ENOMEM;
3178
3179 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
3180 rsk_prot->obj_size, 0,
e96f78ab 3181 prot->slab_flags, NULL);
0159dfd3
ED		 3182
3183 if (!rsk_prot->slab) {
3184 pr_crit("%s: Can't create request sock SLAB cache!\n",
3185 prot->name);
3186 return -ENOMEM;
3187 }
3188 return 0;
3189}
3190
b733c007
PE		 3191int proto_register(struct proto *prot, int alloc_slab)
3192{
1da177e4 3193 if (alloc_slab) {
30c2c9f1
DW		 3194 prot->slab = kmem_cache_create_usercopy(prot->name,
3195 prot->obj_size, 0,
271b72c7 3196 SLAB_HWCACHE_ALIGN | prot->slab_flags,
289a4860 3197 prot->useroffset, prot->usersize,
271b72c7 3198 NULL);
1da177e4
LT		 3199
3200 if (prot->slab == NULL) {
e005d193
JP		 3201 pr_crit("%s: Can't create sock SLAB cache!\n",
3202 prot->name);
60e7663d 3203 goto out;
1da177e4 3204 }
2e6599cb 3205
0159dfd3
ED		 3206 if (req_prot_init(prot))
3207 goto out_free_request_sock_slab;
8feaf0c0 3208
6d6ee43e 3209 if (prot->twsk_prot != NULL) {
faf23422 3210 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 3211
7e56b5d6 3212 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 3213 goto out_free_request_sock_slab;
3214
6d6ee43e 3215 prot->twsk_prot->twsk_slab =
7e56b5d6 3216 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 3217 prot->twsk_prot->twsk_obj_size,
3ab5aee7 3218 0,
52db70dc 3219 prot->slab_flags,
20c2df83 3220 NULL);
6d6ee43e 3221 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 3222 goto out_free_timewait_sock_slab_name;
3223 }
1da177e4
LT		 3224 }
3225
36b77a52 3226 mutex_lock(&proto_list_mutex);
1da177e4 3227 list_add(&prot->node, &proto_list);
13ff3d6f 3228 assign_proto_idx(prot);
36b77a52 3229 mutex_unlock(&proto_list_mutex);
b733c007
PE		 3230 return 0;
3231
8feaf0c0 3232out_free_timewait_sock_slab_name:
7e56b5d6 3233 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0 3234out_free_request_sock_slab:
0159dfd3
ED		 3235 req_prot_cleanup(prot->rsk_prot);
3236
2e6599cb
ACM		 3237 kmem_cache_destroy(prot->slab);
3238 prot->slab = NULL;
b733c007
PE		 3239out:
3240 return -ENOBUFS;
1da177e4 3241}
1da177e4
LT		 3242EXPORT_SYMBOL(proto_register);
3243
3244void proto_unregister(struct proto *prot)
3245{
36b77a52 3246 mutex_lock(&proto_list_mutex);
13ff3d6f 3247 release_proto_idx(prot);
0a3f4358 3248 list_del(&prot->node);
36b77a52 3249 mutex_unlock(&proto_list_mutex);
1da177e4 3250
adf78eda
JL		 3251 kmem_cache_destroy(prot->slab);
3252 prot->slab = NULL;
1da177e4 3253
0159dfd3 3254 req_prot_cleanup(prot->rsk_prot);
2e6599cb 3255
6d6ee43e 3256 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 3257 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 3258 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 3259 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 3260 }
1da177e4 3261}
1da177e4
LT		 3262EXPORT_SYMBOL(proto_unregister);
3263
3264#ifdef CONFIG_PROC_FS
1da177e4 3265static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 3266 __acquires(proto_list_mutex)
1da177e4 3267{
36b77a52 3268 mutex_lock(&proto_list_mutex);
60f0438a 3269 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 3270}
3271
3272static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3273{
60f0438a 3274 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 3275}
3276
3277static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 3278 __releases(proto_list_mutex)
1da177e4 3279{
36b77a52 3280 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 3281}
3282
3283static char proto_method_implemented(const void *method)
3284{
3285 return method == NULL ? 'n' : 'y';
3286}
180d8cd9
GC		 3287static long sock_prot_memory_allocated(struct proto *proto)
3288{
cb75a36c 3289 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 3290}
3291
3292static char *sock_prot_memory_pressure(struct proto *proto)
3293{
3294 return proto->memory_pressure != NULL ?
3295 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
3296}
1da177e4
LT		 3297
3298static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
3299{
180d8cd9 3300
8d987e5c 3301 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 3302 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3303 proto->name,
3304 proto->obj_size,
14e943db 3305 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 3306 sock_prot_memory_allocated(proto),
3307 sock_prot_memory_pressure(proto),
1da177e4
LT		 3308 proto->max_header,
3309 proto->slab == NULL ? "no" : "yes",
3310 module_name(proto->owner),
3311 proto_method_implemented(proto->close),
3312 proto_method_implemented(proto->connect),
3313 proto_method_implemented(proto->disconnect),
3314 proto_method_implemented(proto->accept),
3315 proto_method_implemented(proto->ioctl),
3316 proto_method_implemented(proto->init),
3317 proto_method_implemented(proto->destroy),
3318 proto_method_implemented(proto->shutdown),
3319 proto_method_implemented(proto->setsockopt),
3320 proto_method_implemented(proto->getsockopt),
3321 proto_method_implemented(proto->sendmsg),
3322 proto_method_implemented(proto->recvmsg),
3323 proto_method_implemented(proto->sendpage),
3324 proto_method_implemented(proto->bind),
3325 proto_method_implemented(proto->backlog_rcv),
3326 proto_method_implemented(proto->hash),
3327 proto_method_implemented(proto->unhash),
3328 proto_method_implemented(proto->get_port),
3329 proto_method_implemented(proto->enter_memory_pressure));
3330}
3331
3332static int proto_seq_show(struct seq_file *seq, void *v)
3333{
60f0438a 3334 if (v == &proto_list)
1da177e4
LT		 3335 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3336 "protocol",
3337 "size",
3338 "sockets",
3339 "memory",
3340 "press",
3341 "maxhdr",
3342 "slab",
3343 "module",
3344 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3345 else
60f0438a 3346 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 3347 return 0;
3348}
3349
f690808e 3350static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 3351 .start = proto_seq_start,
3352 .next = proto_seq_next,
3353 .stop = proto_seq_stop,
3354 .show = proto_seq_show,
3355};
3356
3357static int proto_seq_open(struct inode *inode, struct file *file)
3358{
14e943db
ED		 3359 return seq_open_net(inode, file, &proto_seq_ops,
3360 sizeof(struct seq_net_private));
1da177e4
LT		 3361}
3362
9a32144e 3363static const struct file_operations proto_seq_fops = {
1da177e4
LT		 3364 .open = proto_seq_open,
3365 .read = seq_read,
3366 .llseek = seq_lseek,
14e943db
ED		 3367 .release = seq_release_net,
3368};
3369
3370static __net_init int proto_init_net(struct net *net)
3371{
d4beaa66 3372 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 3373 return -ENOMEM;
3374
3375 return 0;
3376}
3377
3378static __net_exit void proto_exit_net(struct net *net)
3379{
ece31ffd 3380 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 3381}
3382
3383
3384static __net_initdata struct pernet_operations proto_net_ops = {
3385 .init = proto_init_net,
3386 .exit = proto_exit_net,
1da177e4
LT		 3387};
3388
3389static int __init proto_init(void)
3390{
14e943db 3391 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 3392}
3393
3394subsys_initcall(proto_init);
3395
3396#endif /* PROC_FS */
7db6b048
SS		 3397
3398#ifdef CONFIG_NET_RX_BUSY_POLL
3399bool sk_busy_loop_end(void *p, unsigned long start_time)
3400{
3401 struct sock *sk = p;
3402
3403 return !skb_queue_empty(&sk->sk_receive_queue) ||
3404 sk_busy_loop_timeout(sk, start_time);
3405}
3406EXPORT_SYMBOL(sk_busy_loop_end);
3407#endif /* CONFIG_NET_RX_BUSY_POLL */
Linux 6.x block layer and io_uring tree(s)