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Merge tag 'doc-4.8-fixes' of git://git.lwn.net/linux
[deliverable/linux.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
4ec93edb 35 * code. The ACK stuff can wait and needs major
1da177e4
LT		 36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 *
85 *
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
90 */
91
e005d193
JP		 92#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
93
4fc268d2 94#include <linux/capability.h>
1da177e4 95#include <linux/errno.h>
cb820f8e 96#include <linux/errqueue.h>
1da177e4
LT		 97#include <linux/types.h>
98#include <linux/socket.h>
99#include <linux/in.h>
100#include <linux/kernel.h>
1da177e4
LT		 101#include <linux/module.h>
102#include <linux/proc_fs.h>
103#include <linux/seq_file.h>
104#include <linux/sched.h>
105#include <linux/timer.h>
106#include <linux/string.h>
107#include <linux/sockios.h>
108#include <linux/net.h>
109#include <linux/mm.h>
110#include <linux/slab.h>
111#include <linux/interrupt.h>
112#include <linux/poll.h>
113#include <linux/tcp.h>
114#include <linux/init.h>
a1f8e7f7 115#include <linux/highmem.h>
3f551f94 116#include <linux/user_namespace.h>
c5905afb 117#include <linux/static_key.h>
3969eb38 118#include <linux/memcontrol.h>
8c1ae10d 119#include <linux/prefetch.h>
1da177e4
LT		 120
121#include <asm/uaccess.h>
1da177e4
LT		 122
123#include <linux/netdevice.h>
124#include <net/protocol.h>
125#include <linux/skbuff.h>
457c4cbc 126#include <net/net_namespace.h>
2e6599cb 127#include <net/request_sock.h>
1da177e4 128#include <net/sock.h>
20d49473 129#include <linux/net_tstamp.h>
1da177e4
LT		 130#include <net/xfrm.h>
131#include <linux/ipsec.h>
f8451725 132#include <net/cls_cgroup.h>
5bc1421e 133#include <net/netprio_cgroup.h>
eb4cb008 134#include <linux/sock_diag.h>
1da177e4
LT		 135
136#include <linux/filter.h>
538950a1 137#include <net/sock_reuseport.h>
1da177e4 138
3847ce32
SM		 139#include <trace/events/sock.h>
140
1da177e4
LT		 141#ifdef CONFIG_INET
142#include <net/tcp.h>
143#endif
144
076bb0c8 145#include <net/busy_poll.h>
06021292 146
36b77a52 147static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 148static LIST_HEAD(proto_list);
149
a3b299da
EB		 150/**
151 * sk_ns_capable - General socket capability test
152 * @sk: Socket to use a capability on or through
153 * @user_ns: The user namespace of the capability to use
154 * @cap: The capability to use
155 *
156 * Test to see if the opener of the socket had when the socket was
157 * created and the current process has the capability @cap in the user
158 * namespace @user_ns.
159 */
160bool sk_ns_capable(const struct sock *sk,
161 struct user_namespace *user_ns, int cap)
162{
163 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
164 ns_capable(user_ns, cap);
165}
166EXPORT_SYMBOL(sk_ns_capable);
167
168/**
169 * sk_capable - Socket global capability test
170 * @sk: Socket to use a capability on or through
e793c0f7 171 * @cap: The global capability to use
a3b299da
EB		 172 *
173 * Test to see if the opener of the socket had when the socket was
174 * created and the current process has the capability @cap in all user
175 * namespaces.
176 */
177bool sk_capable(const struct sock *sk, int cap)
178{
179 return sk_ns_capable(sk, &init_user_ns, cap);
180}
181EXPORT_SYMBOL(sk_capable);
182
183/**
184 * sk_net_capable - Network namespace socket capability test
185 * @sk: Socket to use a capability on or through
186 * @cap: The capability to use
187 *
e793c0f7 188 * Test to see if the opener of the socket had when the socket was created
a3b299da
EB		 189 * and the current process has the capability @cap over the network namespace
190 * the socket is a member of.
191 */
192bool sk_net_capable(const struct sock *sk, int cap)
193{
194 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
195}
196EXPORT_SYMBOL(sk_net_capable);
197
da21f24d
IM		 198/*
199 * Each address family might have different locking rules, so we have
200 * one slock key per address family:
201 */
a5b5bb9a
IM		 202static struct lock_class_key af_family_keys[AF_MAX];
203static struct lock_class_key af_family_slock_keys[AF_MAX];
204
a5b5bb9a
IM		 205/*
206 * Make lock validator output more readable. (we pre-construct these
207 * strings build-time, so that runtime initialization of socket
208 * locks is fast):
209 */
36cbd3dc 210static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 211 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
212 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
213 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
214 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
215 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
216 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
217 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 218 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 219 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 220 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 221 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 222 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 223 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
0a1a37b6
DC		 224 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_KCM" ,
225 "sk_lock-AF_MAX"
a5b5bb9a 226};
36cbd3dc 227static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 228 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
229 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
230 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
231 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
232 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
233 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
234 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 235 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 236 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 237 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 238 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 239 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 240 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
0a1a37b6
DC		 241 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_KCM" ,
242 "slock-AF_MAX"
a5b5bb9a 243};
36cbd3dc 244static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 245 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
246 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
247 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
248 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
249 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
250 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
251 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 252 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 253 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 254 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 255 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 256 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 257 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
0a1a37b6
DC		 258 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_KCM" ,
259 "clock-AF_MAX"
443aef0e 260};
da21f24d
IM		 261
262/*
263 * sk_callback_lock locking rules are per-address-family,
264 * so split the lock classes by using a per-AF key:
265 */
266static struct lock_class_key af_callback_keys[AF_MAX];
267
1da177e4
LT		 268/* Take into consideration the size of the struct sk_buff overhead in the
269 * determination of these values, since that is non-constant across
270 * platforms. This makes socket queueing behavior and performance
271 * not depend upon such differences.
272 */
273#define _SK_MEM_PACKETS 256
87fb4b7b 274#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 275#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
276#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
277
278/* Run time adjustable parameters. */
ab32ea5d 279__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 280EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 281__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 282EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 283__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
284__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 285
25985edc 286/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 287int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 288EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 289
b245be1f
WB		 290int sysctl_tstamp_allow_data __read_mostly = 1;
291
c93bdd0e
MG		 292struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
293EXPORT_SYMBOL_GPL(memalloc_socks);
294
7cb02404
MG		 295/**
296 * sk_set_memalloc - sets %SOCK_MEMALLOC
297 * @sk: socket to set it on
298 *
299 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
300 * It's the responsibility of the admin to adjust min_free_kbytes
301 * to meet the requirements
302 */
303void sk_set_memalloc(struct sock *sk)
304{
305 sock_set_flag(sk, SOCK_MEMALLOC);
306 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 307 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 308}
309EXPORT_SYMBOL_GPL(sk_set_memalloc);
310
311void sk_clear_memalloc(struct sock *sk)
312{
313 sock_reset_flag(sk, SOCK_MEMALLOC);
314 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 315 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 316
317 /*
318 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
5d753610
MG		 319 * progress of swapping. SOCK_MEMALLOC may be cleared while
320 * it has rmem allocations due to the last swapfile being deactivated
321 * but there is a risk that the socket is unusable due to exceeding
322 * the rmem limits. Reclaim the reserves and obey rmem limits again.
c76562b6 323 */
5d753610 324 sk_mem_reclaim(sk);
7cb02404
MG		 325}
326EXPORT_SYMBOL_GPL(sk_clear_memalloc);
327
b4b9e355
MG		 328int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
329{
330 int ret;
331 unsigned long pflags = current->flags;
332
333 /* these should have been dropped before queueing */
334 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
335
336 current->flags |= PF_MEMALLOC;
337 ret = sk->sk_backlog_rcv(sk, skb);
338 tsk_restore_flags(current, pflags, PF_MEMALLOC);
339
340 return ret;
341}
342EXPORT_SYMBOL(__sk_backlog_rcv);
343
1da177e4
LT		 344static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
345{
346 struct timeval tv;
347
348 if (optlen < sizeof(tv))
349 return -EINVAL;
350 if (copy_from_user(&tv, optval, sizeof(tv)))
351 return -EFAULT;
ba78073e
VA		 352 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
353 return -EDOM;
1da177e4 354
ba78073e 355 if (tv.tv_sec < 0) {
6f11df83
AM		 356 static int warned __read_mostly;
357
ba78073e 358 *timeo_p = 0;
50aab54f 359 if (warned < 10 && net_ratelimit()) {
ba78073e 360 warned++;
e005d193
JP		 361 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
362 __func__, current->comm, task_pid_nr(current));
50aab54f 363 }
ba78073e
VA		 364 return 0;
365 }
1da177e4
LT		 366 *timeo_p = MAX_SCHEDULE_TIMEOUT;
367 if (tv.tv_sec == 0 && tv.tv_usec == 0)
368 return 0;
369 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
370 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
371 return 0;
372}
373
374static void sock_warn_obsolete_bsdism(const char *name)
375{
376 static int warned;
377 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 378 if (strcmp(warncomm, current->comm) && warned < 5) {
379 strcpy(warncomm, current->comm);
e005d193
JP		 380 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
381 warncomm, name);
1da177e4
LT		 382 warned++;
383 }
384}
385
080a270f
HFS		 386static bool sock_needs_netstamp(const struct sock *sk)
387{
388 switch (sk->sk_family) {
389 case AF_UNSPEC:
390 case AF_UNIX:
391 return false;
392 default:
393 return true;
394 }
395}
396
08e29af3 397static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 398{
08e29af3
ED		 399 if (sk->sk_flags & flags) {
400 sk->sk_flags &= ~flags;
080a270f
HFS		 401 if (sock_needs_netstamp(sk) &&
402 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 403 net_disable_timestamp();
1da177e4
LT		 404 }
405}
406
407
e6afc8ac 408int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
f0088a50 409{
3b885787
NH		 410 unsigned long flags;
411 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 412
0fd7bac6 413 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 414 atomic_inc(&sk->sk_drops);
3847ce32 415 trace_sock_rcvqueue_full(sk, skb);
766e9037 416 return -ENOMEM;
f0088a50
DV		 417 }
418
c76562b6 419 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 420 atomic_inc(&sk->sk_drops);
421 return -ENOBUFS;
3ab224be
HA		 422 }
423
f0088a50
DV		 424 skb->dev = NULL;
425 skb_set_owner_r(skb, sk);
49ad9599 426
7fee226a
ED		 427 /* we escape from rcu protected region, make sure we dont leak
428 * a norefcounted dst
429 */
430 skb_dst_force(skb);
431
3b885787 432 spin_lock_irqsave(&list->lock, flags);
3bc3b96f 433 sock_skb_set_dropcount(sk, skb);
3b885787
NH		 434 __skb_queue_tail(list, skb);
435 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 436
437 if (!sock_flag(sk, SOCK_DEAD))
676d2369 438 sk->sk_data_ready(sk);
766e9037 439 return 0;
f0088a50 440}
e6afc8ac 441EXPORT_SYMBOL(__sock_queue_rcv_skb);
442
443int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
444{
445 int err;
446
447 err = sk_filter(sk, skb);
448 if (err)
449 return err;
450
451 return __sock_queue_rcv_skb(sk, skb);
452}
f0088a50
DV		 453EXPORT_SYMBOL(sock_queue_rcv_skb);
454
4f0c40d9
WB		 455int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
456 const int nested, unsigned int trim_cap)
f0088a50
DV		 457{
458 int rc = NET_RX_SUCCESS;
459
4f0c40d9 460 if (sk_filter_trim_cap(sk, skb, trim_cap))
f0088a50
DV		 461 goto discard_and_relse;
462
463 skb->dev = NULL;
464
274f482d 465 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 466 atomic_inc(&sk->sk_drops);
467 goto discard_and_relse;
468 }
58a5a7b9
ACM		 469 if (nested)
470 bh_lock_sock_nested(sk);
471 else
472 bh_lock_sock(sk);
a5b5bb9a
IM		 473 if (!sock_owned_by_user(sk)) {
474 /*
475 * trylock + unlock semantics:
476 */
477 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
478
c57943a1 479 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 480
481 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 482 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 483 bh_unlock_sock(sk);
484 atomic_inc(&sk->sk_drops);
485 goto discard_and_relse;
486 }
487
f0088a50
DV		 488 bh_unlock_sock(sk);
489out:
490 sock_put(sk);
491 return rc;
492discard_and_relse:
493 kfree_skb(skb);
494 goto out;
495}
4f0c40d9 496EXPORT_SYMBOL(__sk_receive_skb);
f0088a50
DV		 497
498struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
499{
b6c6712a 500 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 501
502 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 503 sk_tx_queue_clear(sk);
a9b3cd7f 504 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 505 dst_release(dst);
506 return NULL;
507 }
508
509 return dst;
510}
511EXPORT_SYMBOL(__sk_dst_check);
512
513struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
514{
515 struct dst_entry *dst = sk_dst_get(sk);
516
517 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
518 sk_dst_reset(sk);
519 dst_release(dst);
520 return NULL;
521 }
522
523 return dst;
524}
525EXPORT_SYMBOL(sk_dst_check);
526
c91f6df2
BH		 527static int sock_setbindtodevice(struct sock *sk, char __user *optval,
528 int optlen)
4878809f
DM		 529{
530 int ret = -ENOPROTOOPT;
531#ifdef CONFIG_NETDEVICES
3b1e0a65 532 struct net *net = sock_net(sk);
4878809f
DM		 533 char devname[IFNAMSIZ];
534 int index;
535
536 /* Sorry... */
537 ret = -EPERM;
5e1fccc0 538 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 539 goto out;
540
541 ret = -EINVAL;
542 if (optlen < 0)
543 goto out;
544
545 /* Bind this socket to a particular device like "eth0",
546 * as specified in the passed interface name. If the
547 * name is "" or the option length is zero the socket
548 * is not bound.
549 */
550 if (optlen > IFNAMSIZ - 1)
551 optlen = IFNAMSIZ - 1;
552 memset(devname, 0, sizeof(devname));
553
554 ret = -EFAULT;
555 if (copy_from_user(devname, optval, optlen))
556 goto out;
557
000ba2e4
DM		 558 index = 0;
559 if (devname[0] != '\0') {
bf8e56bf 560 struct net_device *dev;
4878809f 561
bf8e56bf
ED		 562 rcu_read_lock();
563 dev = dev_get_by_name_rcu(net, devname);
564 if (dev)
565 index = dev->ifindex;
566 rcu_read_unlock();
4878809f
DM		 567 ret = -ENODEV;
568 if (!dev)
569 goto out;
4878809f
DM		 570 }
571
572 lock_sock(sk);
573 sk->sk_bound_dev_if = index;
574 sk_dst_reset(sk);
575 release_sock(sk);
576
577 ret = 0;
578
579out:
580#endif
581
582 return ret;
583}
584
c91f6df2
BH		 585static int sock_getbindtodevice(struct sock *sk, char __user *optval,
586 int __user *optlen, int len)
587{
588 int ret = -ENOPROTOOPT;
589#ifdef CONFIG_NETDEVICES
590 struct net *net = sock_net(sk);
c91f6df2 591 char devname[IFNAMSIZ];
c91f6df2
BH		 592
593 if (sk->sk_bound_dev_if == 0) {
594 len = 0;
595 goto zero;
596 }
597
598 ret = -EINVAL;
599 if (len < IFNAMSIZ)
600 goto out;
601
5dbe7c17
NS		 602 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
603 if (ret)
c91f6df2 604 goto out;
c91f6df2
BH		 605
606 len = strlen(devname) + 1;
607
608 ret = -EFAULT;
609 if (copy_to_user(optval, devname, len))
610 goto out;
611
612zero:
613 ret = -EFAULT;
614 if (put_user(len, optlen))
615 goto out;
616
617 ret = 0;
618
619out:
620#endif
621
622 return ret;
623}
624
c0ef877b
PE		 625static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
626{
627 if (valbool)
628 sock_set_flag(sk, bit);
629 else
630 sock_reset_flag(sk, bit);
631}
632
f60e5990 633bool sk_mc_loop(struct sock *sk)
634{
635 if (dev_recursion_level())
636 return false;
637 if (!sk)
638 return true;
639 switch (sk->sk_family) {
640 case AF_INET:
641 return inet_sk(sk)->mc_loop;
642#if IS_ENABLED(CONFIG_IPV6)
643 case AF_INET6:
644 return inet6_sk(sk)->mc_loop;
645#endif
646 }
647 WARN_ON(1);
648 return true;
649}
650EXPORT_SYMBOL(sk_mc_loop);
651
1da177e4
LT		 652/*
653 * This is meant for all protocols to use and covers goings on
654 * at the socket level. Everything here is generic.
655 */
656
657int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 658 char __user *optval, unsigned int optlen)
1da177e4 659{
2a91525c 660 struct sock *sk = sock->sk;
1da177e4
LT		 661 int val;
662 int valbool;
663 struct linger ling;
664 int ret = 0;
4ec93edb 665
1da177e4
LT		 666 /*
667 * Options without arguments
668 */
669
4878809f 670 if (optname == SO_BINDTODEVICE)
c91f6df2 671 return sock_setbindtodevice(sk, optval, optlen);
4878809f 672
e71a4783
SH		 673 if (optlen < sizeof(int))
674 return -EINVAL;
4ec93edb 675
1da177e4
LT		 676 if (get_user(val, (int __user *)optval))
677 return -EFAULT;
4ec93edb 678
2a91525c 679 valbool = val ? 1 : 0;
1da177e4
LT		 680
681 lock_sock(sk);
682
2a91525c 683 switch (optname) {
e71a4783 684 case SO_DEBUG:
2a91525c 685 if (val && !capable(CAP_NET_ADMIN))
e71a4783 686 ret = -EACCES;
2a91525c 687 else
c0ef877b 688 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 689 break;
690 case SO_REUSEADDR:
4a17fd52 691 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 692 break;
055dc21a
TH		 693 case SO_REUSEPORT:
694 sk->sk_reuseport = valbool;
695 break;
e71a4783 696 case SO_TYPE:
49c794e9 697 case SO_PROTOCOL:
0d6038ee 698 case SO_DOMAIN:
e71a4783
SH		 699 case SO_ERROR:
700 ret = -ENOPROTOOPT;
701 break;
702 case SO_DONTROUTE:
c0ef877b 703 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 704 break;
705 case SO_BROADCAST:
706 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
707 break;
708 case SO_SNDBUF:
709 /* Don't error on this BSD doesn't and if you think
82981930
ED		 710 * about it this is right. Otherwise apps have to
711 * play 'guess the biggest size' games. RCVBUF/SNDBUF
712 * are treated in BSD as hints
713 */
714 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 715set_sndbuf:
e71a4783 716 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 717 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
718 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 719 sk->sk_write_space(sk);
720 break;
1da177e4 721
e71a4783
SH		 722 case SO_SNDBUFFORCE:
723 if (!capable(CAP_NET_ADMIN)) {
724 ret = -EPERM;
725 break;
726 }
727 goto set_sndbuf;
b0573dea 728
e71a4783
SH		 729 case SO_RCVBUF:
730 /* Don't error on this BSD doesn't and if you think
82981930
ED		 731 * about it this is right. Otherwise apps have to
732 * play 'guess the biggest size' games. RCVBUF/SNDBUF
733 * are treated in BSD as hints
734 */
735 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 736set_rcvbuf:
e71a4783
SH		 737 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
738 /*
739 * We double it on the way in to account for
740 * "struct sk_buff" etc. overhead. Applications
741 * assume that the SO_RCVBUF setting they make will
742 * allow that much actual data to be received on that
743 * socket.
744 *
745 * Applications are unaware that "struct sk_buff" and
746 * other overheads allocate from the receive buffer
747 * during socket buffer allocation.
748 *
749 * And after considering the possible alternatives,
750 * returning the value we actually used in getsockopt
751 * is the most desirable behavior.
752 */
82981930 753 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 754 break;
755
756 case SO_RCVBUFFORCE:
757 if (!capable(CAP_NET_ADMIN)) {
758 ret = -EPERM;
1da177e4 759 break;
e71a4783
SH		 760 }
761 goto set_rcvbuf;
1da177e4 762
e71a4783 763 case SO_KEEPALIVE:
1da177e4 764#ifdef CONFIG_INET
3e10986d
ED		 765 if (sk->sk_protocol == IPPROTO_TCP &&
766 sk->sk_type == SOCK_STREAM)
e71a4783 767 tcp_set_keepalive(sk, valbool);
1da177e4 768#endif
e71a4783
SH		 769 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
770 break;
771
772 case SO_OOBINLINE:
773 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
774 break;
775
776 case SO_NO_CHECK:
28448b80 777 sk->sk_no_check_tx = valbool;
e71a4783
SH		 778 break;
779
780 case SO_PRIORITY:
5e1fccc0
EB		 781 if ((val >= 0 && val <= 6) ||
782 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 783 sk->sk_priority = val;
784 else
785 ret = -EPERM;
786 break;
787
788 case SO_LINGER:
789 if (optlen < sizeof(ling)) {
790 ret = -EINVAL; /* 1003.1g */
1da177e4 791 break;
e71a4783 792 }
2a91525c 793 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 794 ret = -EFAULT;
1da177e4 795 break;
e71a4783
SH		 796 }
797 if (!ling.l_onoff)
798 sock_reset_flag(sk, SOCK_LINGER);
799 else {
1da177e4 800#if (BITS_PER_LONG == 32)
e71a4783
SH		 801 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
802 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 803 else
e71a4783
SH		 804#endif
805 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
806 sock_set_flag(sk, SOCK_LINGER);
807 }
808 break;
809
810 case SO_BSDCOMPAT:
811 sock_warn_obsolete_bsdism("setsockopt");
812 break;
813
814 case SO_PASSCRED:
815 if (valbool)
816 set_bit(SOCK_PASSCRED, &sock->flags);
817 else
818 clear_bit(SOCK_PASSCRED, &sock->flags);
819 break;
820
821 case SO_TIMESTAMP:
92f37fd2 822 case SO_TIMESTAMPNS:
e71a4783 823 if (valbool) {
92f37fd2
ED		 824 if (optname == SO_TIMESTAMP)
825 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
826 else
827 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 828 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 829 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 830 } else {
e71a4783 831 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 832 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
833 }
e71a4783
SH		 834 break;
835
20d49473
PO		 836 case SO_TIMESTAMPING:
837 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 838 ret = -EINVAL;
20d49473
PO		 839 break;
840 }
b245be1f 841
09c2d251 842 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765 843 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
ac5cc977
WC		 844 if (sk->sk_protocol == IPPROTO_TCP &&
845 sk->sk_type == SOCK_STREAM) {
6db8b963
SHY		 846 if ((1 << sk->sk_state) &
847 (TCPF_CLOSE | TCPF_LISTEN)) {
4ed2d765
WB		 848 ret = -EINVAL;
849 break;
850 }
851 sk->sk_tskey = tcp_sk(sk)->snd_una;
852 } else {
853 sk->sk_tskey = 0;
854 }
855 }
b9f40e21 856 sk->sk_tsflags = val;
20d49473
PO		 857 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
858 sock_enable_timestamp(sk,
859 SOCK_TIMESTAMPING_RX_SOFTWARE);
860 else
861 sock_disable_timestamp(sk,
08e29af3 862 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 863 break;
864
e71a4783
SH		 865 case SO_RCVLOWAT:
866 if (val < 0)
867 val = INT_MAX;
868 sk->sk_rcvlowat = val ? : 1;
869 break;
870
871 case SO_RCVTIMEO:
872 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
873 break;
874
875 case SO_SNDTIMEO:
876 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
877 break;
1da177e4 878
e71a4783
SH		 879 case SO_ATTACH_FILTER:
880 ret = -EINVAL;
881 if (optlen == sizeof(struct sock_fprog)) {
882 struct sock_fprog fprog;
1da177e4 883
e71a4783
SH		 884 ret = -EFAULT;
885 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 886 break;
e71a4783
SH		 887
888 ret = sk_attach_filter(&fprog, sk);
889 }
890 break;
891
89aa0758
AS		 892 case SO_ATTACH_BPF:
893 ret = -EINVAL;
894 if (optlen == sizeof(u32)) {
895 u32 ufd;
896
897 ret = -EFAULT;
898 if (copy_from_user(&ufd, optval, sizeof(ufd)))
899 break;
900
901 ret = sk_attach_bpf(ufd, sk);
902 }
903 break;
904
538950a1
CG		 905 case SO_ATTACH_REUSEPORT_CBPF:
906 ret = -EINVAL;
907 if (optlen == sizeof(struct sock_fprog)) {
908 struct sock_fprog fprog;
909
910 ret = -EFAULT;
911 if (copy_from_user(&fprog, optval, sizeof(fprog)))
912 break;
913
914 ret = sk_reuseport_attach_filter(&fprog, sk);
915 }
916 break;
917
918 case SO_ATTACH_REUSEPORT_EBPF:
919 ret = -EINVAL;
920 if (optlen == sizeof(u32)) {
921 u32 ufd;
922
923 ret = -EFAULT;
924 if (copy_from_user(&ufd, optval, sizeof(ufd)))
925 break;
926
927 ret = sk_reuseport_attach_bpf(ufd, sk);
928 }
929 break;
930
e71a4783 931 case SO_DETACH_FILTER:
55b33325 932 ret = sk_detach_filter(sk);
e71a4783 933 break;
1da177e4 934
d59577b6
VB		 935 case SO_LOCK_FILTER:
936 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
937 ret = -EPERM;
938 else
939 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
940 break;
941
e71a4783
SH		 942 case SO_PASSSEC:
943 if (valbool)
944 set_bit(SOCK_PASSSEC, &sock->flags);
945 else
946 clear_bit(SOCK_PASSSEC, &sock->flags);
947 break;
4a19ec58 948 case SO_MARK:
5e1fccc0 949 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 950 ret = -EPERM;
2a91525c 951 else
4a19ec58 952 sk->sk_mark = val;
4a19ec58 953 break;
877ce7c1 954
3b885787 955 case SO_RXQ_OVFL:
8083f0fc 956 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 957 break;
6e3e939f
JB		 958
959 case SO_WIFI_STATUS:
960 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
961 break;
962
ef64a54f
PE		 963 case SO_PEEK_OFF:
964 if (sock->ops->set_peek_off)
12663bfc 965 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 966 else
967 ret = -EOPNOTSUPP;
968 break;
3bdc0eba
BG		 969
970 case SO_NOFCS:
971 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
972 break;
973
7d4c04fc
KJ		 974 case SO_SELECT_ERR_QUEUE:
975 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
976 break;
977
e0d1095a 978#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 979 case SO_BUSY_POLL:
dafcc438
ET		 980 /* allow unprivileged users to decrease the value */
981 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
982 ret = -EPERM;
983 else {
984 if (val < 0)
985 ret = -EINVAL;
986 else
987 sk->sk_ll_usec = val;
988 }
989 break;
990#endif
62748f32
ED		 991
992 case SO_MAX_PACING_RATE:
993 sk->sk_max_pacing_rate = val;
994 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
995 sk->sk_max_pacing_rate);
996 break;
997
70da268b
ED		 998 case SO_INCOMING_CPU:
999 sk->sk_incoming_cpu = val;
1000 break;
1001
a87cb3e4
TH		 1002 case SO_CNX_ADVICE:
1003 if (val == 1)
1004 dst_negative_advice(sk);
1005 break;
e71a4783
SH		 1006 default:
1007 ret = -ENOPROTOOPT;
1008 break;
4ec93edb 1009 }
1da177e4
LT		 1010 release_sock(sk);
1011 return ret;
1012}
2a91525c 1013EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 1014
1015
8f09898b 1016static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1017 struct ucred *ucred)
3f551f94
EB		 1018{
1019 ucred->pid = pid_vnr(pid);
1020 ucred->uid = ucred->gid = -1;
1021 if (cred) {
1022 struct user_namespace *current_ns = current_user_ns();
1023
b2e4f544
EB		 1024 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1025 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 1026 }
1027}
1028
1da177e4
LT		 1029int sock_getsockopt(struct socket *sock, int level, int optname,
1030 char __user *optval, int __user *optlen)
1031{
1032 struct sock *sk = sock->sk;
4ec93edb 1033
e71a4783 1034 union {
4ec93edb
YH		 1035 int val;
1036 struct linger ling;
1da177e4
LT		 1037 struct timeval tm;
1038 } v;
4ec93edb 1039
4d0392be 1040 int lv = sizeof(int);
1da177e4 1041 int len;
4ec93edb 1042
e71a4783 1043 if (get_user(len, optlen))
4ec93edb 1044 return -EFAULT;
e71a4783 1045 if (len < 0)
1da177e4 1046 return -EINVAL;
4ec93edb 1047
50fee1de 1048 memset(&v, 0, sizeof(v));
df0bca04 1049
2a91525c 1050 switch (optname) {
e71a4783
SH		 1051 case SO_DEBUG:
1052 v.val = sock_flag(sk, SOCK_DBG);
1053 break;
1054
1055 case SO_DONTROUTE:
1056 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1057 break;
1058
1059 case SO_BROADCAST:
1b23a5df 1060 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1061 break;
1062
1063 case SO_SNDBUF:
1064 v.val = sk->sk_sndbuf;
1065 break;
1066
1067 case SO_RCVBUF:
1068 v.val = sk->sk_rcvbuf;
1069 break;
1070
1071 case SO_REUSEADDR:
1072 v.val = sk->sk_reuse;
1073 break;
1074
055dc21a
TH		 1075 case SO_REUSEPORT:
1076 v.val = sk->sk_reuseport;
1077 break;
1078
e71a4783 1079 case SO_KEEPALIVE:
1b23a5df 1080 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1081 break;
1082
1083 case SO_TYPE:
1084 v.val = sk->sk_type;
1085 break;
1086
49c794e9
JE		 1087 case SO_PROTOCOL:
1088 v.val = sk->sk_protocol;
1089 break;
1090
0d6038ee
JE		 1091 case SO_DOMAIN:
1092 v.val = sk->sk_family;
1093 break;
1094
e71a4783
SH		 1095 case SO_ERROR:
1096 v.val = -sock_error(sk);
2a91525c 1097 if (v.val == 0)
e71a4783
SH		 1098 v.val = xchg(&sk->sk_err_soft, 0);
1099 break;
1100
1101 case SO_OOBINLINE:
1b23a5df 1102 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1103 break;
1104
1105 case SO_NO_CHECK:
28448b80 1106 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1107 break;
1108
1109 case SO_PRIORITY:
1110 v.val = sk->sk_priority;
1111 break;
1112
1113 case SO_LINGER:
1114 lv = sizeof(v.ling);
1b23a5df 1115 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1116 v.ling.l_linger = sk->sk_lingertime / HZ;
1117 break;
1118
1119 case SO_BSDCOMPAT:
1120 sock_warn_obsolete_bsdism("getsockopt");
1121 break;
1122
1123 case SO_TIMESTAMP:
92f37fd2
ED		 1124 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1125 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1126 break;
1127
1128 case SO_TIMESTAMPNS:
1129 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1130 break;
1131
20d49473 1132 case SO_TIMESTAMPING:
b9f40e21 1133 v.val = sk->sk_tsflags;
20d49473
PO		 1134 break;
1135
e71a4783 1136 case SO_RCVTIMEO:
2a91525c 1137 lv = sizeof(struct timeval);
e71a4783
SH		 1138 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1139 v.tm.tv_sec = 0;
1140 v.tm.tv_usec = 0;
1141 } else {
1142 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1143 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1144 }
1145 break;
1146
1147 case SO_SNDTIMEO:
2a91525c 1148 lv = sizeof(struct timeval);
e71a4783
SH		 1149 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1150 v.tm.tv_sec = 0;
1151 v.tm.tv_usec = 0;
1152 } else {
1153 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1154 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1155 }
1156 break;
1da177e4 1157
e71a4783
SH		 1158 case SO_RCVLOWAT:
1159 v.val = sk->sk_rcvlowat;
1160 break;
1da177e4 1161
e71a4783 1162 case SO_SNDLOWAT:
2a91525c 1163 v.val = 1;
e71a4783 1164 break;
1da177e4 1165
e71a4783 1166 case SO_PASSCRED:
82981930 1167 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1168 break;
1da177e4 1169
e71a4783 1170 case SO_PEERCRED:
109f6e39
EB		 1171 {
1172 struct ucred peercred;
1173 if (len > sizeof(peercred))
1174 len = sizeof(peercred);
1175 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1176 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1177 return -EFAULT;
1178 goto lenout;
109f6e39 1179 }
1da177e4 1180
e71a4783
SH		 1181 case SO_PEERNAME:
1182 {
1183 char address[128];
1184
1185 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1186 return -ENOTCONN;
1187 if (lv < len)
1188 return -EINVAL;
1189 if (copy_to_user(optval, address, len))
1190 return -EFAULT;
1191 goto lenout;
1192 }
1da177e4 1193
e71a4783
SH		 1194 /* Dubious BSD thing... Probably nobody even uses it, but
1195 * the UNIX standard wants it for whatever reason... -DaveM
1196 */
1197 case SO_ACCEPTCONN:
1198 v.val = sk->sk_state == TCP_LISTEN;
1199 break;
1da177e4 1200
e71a4783 1201 case SO_PASSSEC:
82981930 1202 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1203 break;
877ce7c1 1204
e71a4783
SH		 1205 case SO_PEERSEC:
1206 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1207
4a19ec58
LAT		 1208 case SO_MARK:
1209 v.val = sk->sk_mark;
1210 break;
1211
3b885787 1212 case SO_RXQ_OVFL:
1b23a5df 1213 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1214 break;
1215
6e3e939f 1216 case SO_WIFI_STATUS:
1b23a5df 1217 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1218 break;
1219
ef64a54f
PE		 1220 case SO_PEEK_OFF:
1221 if (!sock->ops->set_peek_off)
1222 return -EOPNOTSUPP;
1223
1224 v.val = sk->sk_peek_off;
1225 break;
bc2f7996 1226 case SO_NOFCS:
1b23a5df 1227 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1228 break;
c91f6df2 1229
f7b86bfe 1230 case SO_BINDTODEVICE:
c91f6df2
BH		 1231 return sock_getbindtodevice(sk, optval, optlen, len);
1232
a8fc9277
PE		 1233 case SO_GET_FILTER:
1234 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1235 if (len < 0)
1236 return len;
1237
1238 goto lenout;
c91f6df2 1239
d59577b6
VB		 1240 case SO_LOCK_FILTER:
1241 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1242 break;
1243
ea02f941
MS		 1244 case SO_BPF_EXTENSIONS:
1245 v.val = bpf_tell_extensions();
1246 break;
1247
7d4c04fc
KJ		 1248 case SO_SELECT_ERR_QUEUE:
1249 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1250 break;
1251
e0d1095a 1252#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1253 case SO_BUSY_POLL:
dafcc438
ET		 1254 v.val = sk->sk_ll_usec;
1255 break;
1256#endif
1257
62748f32
ED		 1258 case SO_MAX_PACING_RATE:
1259 v.val = sk->sk_max_pacing_rate;
1260 break;
1261
2c8c56e1
ED		 1262 case SO_INCOMING_CPU:
1263 v.val = sk->sk_incoming_cpu;
1264 break;
1265
e71a4783 1266 default:
443b5991
YH		 1267 /* We implement the SO_SNDLOWAT etc to not be settable
1268 * (1003.1g 7).
1269 */
e71a4783 1270 return -ENOPROTOOPT;
1da177e4 1271 }
e71a4783 1272
1da177e4
LT		 1273 if (len > lv)
1274 len = lv;
1275 if (copy_to_user(optval, &v, len))
1276 return -EFAULT;
1277lenout:
4ec93edb
YH		 1278 if (put_user(len, optlen))
1279 return -EFAULT;
1280 return 0;
1da177e4
LT		 1281}
1282
a5b5bb9a
IM		 1283/*
1284 * Initialize an sk_lock.
1285 *
1286 * (We also register the sk_lock with the lock validator.)
1287 */
b6f99a21 1288static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1289{
ed07536e
PZ		 1290 sock_lock_init_class_and_name(sk,
1291 af_family_slock_key_strings[sk->sk_family],
1292 af_family_slock_keys + sk->sk_family,
1293 af_family_key_strings[sk->sk_family],
1294 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1295}
1296
4dc6dc71
ED		 1297/*
1298 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1299 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1300 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1301 */
f1a6c4da
PE		 1302static void sock_copy(struct sock *nsk, const struct sock *osk)
1303{
1304#ifdef CONFIG_SECURITY_NETWORK
1305 void *sptr = nsk->sk_security;
1306#endif
68835aba
ED		 1307 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1308
1309 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1310 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1311
f1a6c4da
PE		 1312#ifdef CONFIG_SECURITY_NETWORK
1313 nsk->sk_security = sptr;
1314 security_sk_clone(osk, nsk);
1315#endif
1316}
1317
fcbdf09d
OP		 1318void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1319{
1320 unsigned long nulls1, nulls2;
1321
1322 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1323 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1324 if (nulls1 > nulls2)
1325 swap(nulls1, nulls2);
1326
1327 if (nulls1 != 0)
1328 memset((char *)sk, 0, nulls1);
1329 memset((char *)sk + nulls1 + sizeof(void *), 0,
1330 nulls2 - nulls1 - sizeof(void *));
1331 memset((char *)sk + nulls2 + sizeof(void *), 0,
1332 size - nulls2 - sizeof(void *));
1333}
1334EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1335
2e4afe7b
PE		 1336static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1337 int family)
c308c1b2
PE		 1338{
1339 struct sock *sk;
1340 struct kmem_cache *slab;
1341
1342 slab = prot->slab;
e912b114
ED		 1343 if (slab != NULL) {
1344 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1345 if (!sk)
1346 return sk;
1347 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1348 if (prot->clear_sk)
1349 prot->clear_sk(sk, prot->obj_size);
1350 else
1351 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1352 }
fcbdf09d 1353 } else
c308c1b2
PE		 1354 sk = kmalloc(prot->obj_size, priority);
1355
2e4afe7b 1356 if (sk != NULL) {
a98b65a3
VN		 1357 kmemcheck_annotate_bitfield(sk, flags);
1358
2e4afe7b
PE		 1359 if (security_sk_alloc(sk, family, priority))
1360 goto out_free;
1361
1362 if (!try_module_get(prot->owner))
1363 goto out_free_sec;
e022f0b4 1364 sk_tx_queue_clear(sk);
bd1060a1 1365 cgroup_sk_alloc(&sk->sk_cgrp_data);
2e4afe7b
PE		 1366 }
1367
c308c1b2 1368 return sk;
2e4afe7b
PE		 1369
1370out_free_sec:
1371 security_sk_free(sk);
1372out_free:
1373 if (slab != NULL)
1374 kmem_cache_free(slab, sk);
1375 else
1376 kfree(sk);
1377 return NULL;
c308c1b2
PE		 1378}
1379
1380static void sk_prot_free(struct proto *prot, struct sock *sk)
1381{
1382 struct kmem_cache *slab;
2e4afe7b 1383 struct module *owner;
c308c1b2 1384
2e4afe7b 1385 owner = prot->owner;
c308c1b2 1386 slab = prot->slab;
2e4afe7b 1387
bd1060a1 1388 cgroup_sk_free(&sk->sk_cgrp_data);
2e4afe7b 1389 security_sk_free(sk);
c308c1b2
PE		 1390 if (slab != NULL)
1391 kmem_cache_free(slab, sk);
1392 else
1393 kfree(sk);
2e4afe7b 1394 module_put(owner);
c308c1b2
PE		 1395}
1396
1da177e4
LT		 1397/**
1398 * sk_alloc - All socket objects are allocated here
c4ea43c5 1399 * @net: the applicable net namespace
4dc3b16b
PP		 1400 * @family: protocol family
1401 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1402 * @prot: struct proto associated with this new sock instance
11aa9c28 1403 * @kern: is this to be a kernel socket?
1da177e4 1404 */
1b8d7ae4 1405struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
11aa9c28 1406 struct proto *prot, int kern)
1da177e4 1407{
c308c1b2 1408 struct sock *sk;
1da177e4 1409
154adbc8 1410 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1411 if (sk) {
154adbc8
PE		 1412 sk->sk_family = family;
1413 /*
1414 * See comment in struct sock definition to understand
1415 * why we need sk_prot_creator -acme
1416 */
1417 sk->sk_prot = sk->sk_prot_creator = prot;
1418 sock_lock_init(sk);
26abe143
EB		 1419 sk->sk_net_refcnt = kern ? 0 : 1;
1420 if (likely(sk->sk_net_refcnt))
1421 get_net(net);
1422 sock_net_set(sk, net);
d66ee058 1423 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1424
2a56a1fe
TH		 1425 sock_update_classid(&sk->sk_cgrp_data);
1426 sock_update_netprioidx(&sk->sk_cgrp_data);
1da177e4 1427 }
a79af59e 1428
2e4afe7b 1429 return sk;
1da177e4 1430}
2a91525c 1431EXPORT_SYMBOL(sk_alloc);
1da177e4 1432
a4298e45
ED		 1433/* Sockets having SOCK_RCU_FREE will call this function after one RCU
1434 * grace period. This is the case for UDP sockets and TCP listeners.
1435 */
1436static void __sk_destruct(struct rcu_head *head)
1da177e4 1437{
a4298e45 1438 struct sock *sk = container_of(head, struct sock, sk_rcu);
1da177e4 1439 struct sk_filter *filter;
1da177e4
LT		 1440
1441 if (sk->sk_destruct)
1442 sk->sk_destruct(sk);
1443
a898def2
PM		 1444 filter = rcu_dereference_check(sk->sk_filter,
1445 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1446 if (filter) {
309dd5fc 1447 sk_filter_uncharge(sk, filter);
a9b3cd7f 1448 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4 1449 }
538950a1
CG		 1450 if (rcu_access_pointer(sk->sk_reuseport_cb))
1451 reuseport_detach_sock(sk);
1da177e4 1452
08e29af3 1453 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1454
1455 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1456 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1457 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1458
109f6e39
EB		 1459 if (sk->sk_peer_cred)
1460 put_cred(sk->sk_peer_cred);
1461 put_pid(sk->sk_peer_pid);
26abe143
EB		 1462 if (likely(sk->sk_net_refcnt))
1463 put_net(sock_net(sk));
c308c1b2 1464 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1465}
2b85a34e 1466
a4298e45
ED		 1467void sk_destruct(struct sock *sk)
1468{
1469 if (sock_flag(sk, SOCK_RCU_FREE))
1470 call_rcu(&sk->sk_rcu, __sk_destruct);
1471 else
1472 __sk_destruct(&sk->sk_rcu);
1473}
1474
eb4cb008
CG		 1475static void __sk_free(struct sock *sk)
1476{
b922622e 1477 if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt))
eb4cb008
CG		 1478 sock_diag_broadcast_destroy(sk);
1479 else
1480 sk_destruct(sk);
1481}
1482
2b85a34e
ED		 1483void sk_free(struct sock *sk)
1484{
1485 /*
25985edc 1486 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1487 * some packets are still in some tx queue.
1488 * If not null, sock_wfree() will call __sk_free(sk) later
1489 */
1490 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1491 __sk_free(sk);
1492}
2a91525c 1493EXPORT_SYMBOL(sk_free);
1da177e4 1494
e56c57d0
ED		 1495/**
1496 * sk_clone_lock - clone a socket, and lock its clone
1497 * @sk: the socket to clone
1498 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1499 *
1500 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1501 */
1502struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1503{
8fd1d178 1504 struct sock *newsk;
278571ba 1505 bool is_charged = true;
87d11ceb 1506
8fd1d178 1507 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1508 if (newsk != NULL) {
1509 struct sk_filter *filter;
1510
892c141e 1511 sock_copy(newsk, sk);
87d11ceb
ACM		 1512
1513 /* SANITY */
8a681736
SV		 1514 if (likely(newsk->sk_net_refcnt))
1515 get_net(sock_net(newsk));
87d11ceb
ACM		 1516 sk_node_init(&newsk->sk_node);
1517 sock_lock_init(newsk);
1518 bh_lock_sock(newsk);
fa438ccf 1519 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1520 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1521
1522 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1523 /*
1524 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1525 */
1526 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1527 atomic_set(&newsk->sk_omem_alloc, 0);
1528 skb_queue_head_init(&newsk->sk_receive_queue);
1529 skb_queue_head_init(&newsk->sk_write_queue);
1530
87d11ceb 1531 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1532 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1533 af_callback_keys + newsk->sk_family,
1534 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1535
1536 newsk->sk_dst_cache = NULL;
1537 newsk->sk_wmem_queued = 0;
1538 newsk->sk_forward_alloc = 0;
9caad864 1539 atomic_set(&newsk->sk_drops, 0);
87d11ceb 1540 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1541 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1542
1543 sock_reset_flag(newsk, SOCK_DONE);
1544 skb_queue_head_init(&newsk->sk_error_queue);
1545
0d7da9dd 1546 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb 1547 if (filter != NULL)
278571ba
AS		 1548 /* though it's an empty new sock, the charging may fail
1549 * if sysctl_optmem_max was changed between creation of
1550 * original socket and cloning
1551 */
1552 is_charged = sk_filter_charge(newsk, filter);
87d11ceb 1553
d188ba86 1554 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
87d11ceb
ACM		 1555 /* It is still raw copy of parent, so invalidate
1556 * destructor and make plain sk_free() */
1557 newsk->sk_destruct = NULL;
b0691c8e 1558 bh_unlock_sock(newsk);
87d11ceb
ACM		 1559 sk_free(newsk);
1560 newsk = NULL;
1561 goto out;
1562 }
fa463497 1563 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
87d11ceb
ACM		 1564
1565 newsk->sk_err = 0;
1566 newsk->sk_priority = 0;
2c8c56e1 1567 newsk->sk_incoming_cpu = raw_smp_processor_id();
33cf7c90 1568 atomic64_set(&newsk->sk_cookie, 0);
4dc6dc71
ED		 1569 /*
1570 * Before updating sk_refcnt, we must commit prior changes to memory
1571 * (Documentation/RCU/rculist_nulls.txt for details)
1572 */
1573 smp_wmb();
87d11ceb
ACM		 1574 atomic_set(&newsk->sk_refcnt, 2);
1575
1576 /*
1577 * Increment the counter in the same struct proto as the master
1578 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1579 * is the same as sk->sk_prot->socks, as this field was copied
1580 * with memcpy).
1581 *
1582 * This _changes_ the previous behaviour, where
1583 * tcp_create_openreq_child always was incrementing the
1584 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1585 * to be taken into account in all callers. -acme
1586 */
1587 sk_refcnt_debug_inc(newsk);
972692e0 1588 sk_set_socket(newsk, NULL);
43815482 1589 newsk->sk_wq = NULL;
87d11ceb 1590
baac50bb 1591 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
3d596f7b 1592 sock_update_memcg(newsk);
f3f511e1 1593
87d11ceb 1594 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1595 sk_sockets_allocated_inc(newsk);
704da560 1596
080a270f
HFS		 1597 if (sock_needs_netstamp(sk) &&
1598 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1599 net_enable_timestamp();
87d11ceb
ACM		 1600 }
1601out:
1602 return newsk;
1603}
e56c57d0 1604EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1605
9958089a
AK		 1606void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1607{
d6a4e26a
ED		 1608 u32 max_segs = 1;
1609
6bd4f355 1610 sk_dst_set(sk, dst);
9958089a
AK		 1611 sk->sk_route_caps = dst->dev->features;
1612 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1613 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1614 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1615 if (sk_can_gso(sk)) {
82cc1a7a 1616 if (dst->header_len) {
9958089a 1617 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1618 } else {
9958089a 1619 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1620 sk->sk_gso_max_size = dst->dev->gso_max_size;
d6a4e26a 1621 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
82cc1a7a 1622 }
9958089a 1623 }
d6a4e26a 1624 sk->sk_gso_max_segs = max_segs;
9958089a
AK		 1625}
1626EXPORT_SYMBOL_GPL(sk_setup_caps);
1627
1da177e4
LT		 1628/*
1629 * Simple resource managers for sockets.
1630 */
1631
1632
4ec93edb
YH		 1633/*
1634 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1635 */
1636void sock_wfree(struct sk_buff *skb)
1637{
1638 struct sock *sk = skb->sk;
d99927f4 1639 unsigned int len = skb->truesize;
1da177e4 1640
d99927f4
ED		 1641 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1642 /*
1643 * Keep a reference on sk_wmem_alloc, this will be released
1644 * after sk_write_space() call
1645 */
1646 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1647 sk->sk_write_space(sk);
d99927f4
ED		 1648 len = 1;
1649 }
2b85a34e 1650 /*
d99927f4
ED		 1651 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1652 * could not do because of in-flight packets
2b85a34e 1653 */
d99927f4 1654 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1655 __sk_free(sk);
1da177e4 1656}
2a91525c 1657EXPORT_SYMBOL(sock_wfree);
1da177e4 1658
1d2077ac
ED		 1659/* This variant of sock_wfree() is used by TCP,
1660 * since it sets SOCK_USE_WRITE_QUEUE.
1661 */
1662void __sock_wfree(struct sk_buff *skb)
1663{
1664 struct sock *sk = skb->sk;
1665
1666 if (atomic_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
1667 __sk_free(sk);
1668}
1669
9e17f8a4
ED		 1670void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1671{
1672 skb_orphan(skb);
1673 skb->sk = sk;
1674#ifdef CONFIG_INET
1675 if (unlikely(!sk_fullsock(sk))) {
1676 skb->destructor = sock_edemux;
1677 sock_hold(sk);
1678 return;
1679 }
1680#endif
1681 skb->destructor = sock_wfree;
1682 skb_set_hash_from_sk(skb, sk);
1683 /*
1684 * We used to take a refcount on sk, but following operation
1685 * is enough to guarantee sk_free() wont free this sock until
1686 * all in-flight packets are completed
1687 */
1688 atomic_add(skb->truesize, &sk->sk_wmem_alloc);
1689}
1690EXPORT_SYMBOL(skb_set_owner_w);
1691
1d2077ac
ED		 1692/* This helper is used by netem, as it can hold packets in its
1693 * delay queue. We want to allow the owner socket to send more
1694 * packets, as if they were already TX completed by a typical driver.
1695 * But we also want to keep skb->sk set because some packet schedulers
1696 * rely on it (sch_fq for example). So we set skb->truesize to a small
1697 * amount (1) and decrease sk_wmem_alloc accordingly.
1698 */
f2f872f9
ED		 1699void skb_orphan_partial(struct sk_buff *skb)
1700{
1d2077ac
ED		 1701 /* If this skb is a TCP pure ACK or already went here,
1702 * we have nothing to do. 2 is already a very small truesize.
1703 */
1704 if (skb->truesize <= 2)
1705 return;
1706
f2f872f9
ED		 1707 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1708 * so we do not completely orphan skb, but transfert all
1709 * accounted bytes but one, to avoid unexpected reorders.
1710 */
1711 if (skb->destructor == sock_wfree
1712#ifdef CONFIG_INET
1713 || skb->destructor == tcp_wfree
1714#endif
1715 ) {
1716 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1717 skb->truesize = 1;
1718 } else {
1719 skb_orphan(skb);
1720 }
1721}
1722EXPORT_SYMBOL(skb_orphan_partial);
1723
4ec93edb
YH		 1724/*
1725 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1726 */
1727void sock_rfree(struct sk_buff *skb)
1728{
1729 struct sock *sk = skb->sk;
d361fd59 1730 unsigned int len = skb->truesize;
1da177e4 1731
d361fd59
ED		 1732 atomic_sub(len, &sk->sk_rmem_alloc);
1733 sk_mem_uncharge(sk, len);
1da177e4 1734}
2a91525c 1735EXPORT_SYMBOL(sock_rfree);
1da177e4 1736
7768eed8
OH		 1737/*
1738 * Buffer destructor for skbs that are not used directly in read or write
1739 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1740 */
62bccb8c
AD		 1741void sock_efree(struct sk_buff *skb)
1742{
1743 sock_put(skb->sk);
1744}
1745EXPORT_SYMBOL(sock_efree);
1746
976d0201 1747kuid_t sock_i_uid(struct sock *sk)
1da177e4 1748{
976d0201 1749 kuid_t uid;
1da177e4 1750
f064af1e 1751 read_lock_bh(&sk->sk_callback_lock);
976d0201 1752 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1753 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1754 return uid;
1755}
2a91525c 1756EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1757
1758unsigned long sock_i_ino(struct sock *sk)
1759{
1760 unsigned long ino;
1761
f064af1e 1762 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1763 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1764 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1765 return ino;
1766}
2a91525c 1767EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1768
1769/*
1770 * Allocate a skb from the socket's send buffer.
1771 */
86a76caf 1772struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1773 gfp_t priority)
1da177e4
LT		 1774{
1775 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1776 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1777 if (skb) {
1778 skb_set_owner_w(skb, sk);
1779 return skb;
1780 }
1781 }
1782 return NULL;
1783}
2a91525c 1784EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1785
4ec93edb 1786/*
1da177e4 1787 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1788 */
dd0fc66f 1789void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1790{
95c96174 1791 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1792 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1793 void *mem;
1794 /* First do the add, to avoid the race if kmalloc
4ec93edb 1795 * might sleep.
1da177e4
LT		 1796 */
1797 atomic_add(size, &sk->sk_omem_alloc);
1798 mem = kmalloc(size, priority);
1799 if (mem)
1800 return mem;
1801 atomic_sub(size, &sk->sk_omem_alloc);
1802 }
1803 return NULL;
1804}
2a91525c 1805EXPORT_SYMBOL(sock_kmalloc);
1da177e4 1806
79e88659
DB		 1807/* Free an option memory block. Note, we actually want the inline
1808 * here as this allows gcc to detect the nullify and fold away the
1809 * condition entirely.
1da177e4 1810 */
79e88659
DB		 1811static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1812 const bool nullify)
1da177e4 1813{
e53da5fb
DM		 1814 if (WARN_ON_ONCE(!mem))
1815 return;
79e88659
DB		 1816 if (nullify)
1817 kzfree(mem);
1818 else
1819 kfree(mem);
1da177e4
LT		 1820 atomic_sub(size, &sk->sk_omem_alloc);
1821}
79e88659
DB		 1822
1823void sock_kfree_s(struct sock *sk, void *mem, int size)
1824{
1825 __sock_kfree_s(sk, mem, size, false);
1826}
2a91525c 1827EXPORT_SYMBOL(sock_kfree_s);
1da177e4 1828
79e88659
DB		 1829void sock_kzfree_s(struct sock *sk, void *mem, int size)
1830{
1831 __sock_kfree_s(sk, mem, size, true);
1832}
1833EXPORT_SYMBOL(sock_kzfree_s);
1834
1da177e4
LT		 1835/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1836 I think, these locks should be removed for datagram sockets.
1837 */
2a91525c 1838static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1839{
1840 DEFINE_WAIT(wait);
1841
9cd3e072 1842 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1da177e4
LT		 1843 for (;;) {
1844 if (!timeo)
1845 break;
1846 if (signal_pending(current))
1847 break;
1848 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1849 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1850 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1851 break;
1852 if (sk->sk_shutdown & SEND_SHUTDOWN)
1853 break;
1854 if (sk->sk_err)
1855 break;
1856 timeo = schedule_timeout(timeo);
1857 }
aa395145 1858 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1859 return timeo;
1860}
1861
1862
1863/*
1864 * Generic send/receive buffer handlers
1865 */
1866
4cc7f68d
HX		 1867struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1868 unsigned long data_len, int noblock,
28d64271 1869 int *errcode, int max_page_order)
1da177e4 1870{
2e4e4410 1871 struct sk_buff *skb;
1da177e4
LT		 1872 long timeo;
1873 int err;
1874
1da177e4 1875 timeo = sock_sndtimeo(sk, noblock);
2e4e4410 1876 for (;;) {
1da177e4
LT		 1877 err = sock_error(sk);
1878 if (err != 0)
1879 goto failure;
1880
1881 err = -EPIPE;
1882 if (sk->sk_shutdown & SEND_SHUTDOWN)
1883 goto failure;
1884
2e4e4410
ED		 1885 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
1886 break;
28d64271 1887
9cd3e072 1888 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2e4e4410
ED		 1889 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1890 err = -EAGAIN;
1891 if (!timeo)
1da177e4 1892 goto failure;
2e4e4410
ED		 1893 if (signal_pending(current))
1894 goto interrupted;
1895 timeo = sock_wait_for_wmem(sk, timeo);
1da177e4 1896 }
2e4e4410
ED		 1897 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
1898 errcode, sk->sk_allocation);
1899 if (skb)
1900 skb_set_owner_w(skb, sk);
1da177e4
LT		 1901 return skb;
1902
1903interrupted:
1904 err = sock_intr_errno(timeo);
1905failure:
1906 *errcode = err;
1907 return NULL;
1908}
4cc7f68d 1909EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1910
4ec93edb 1911struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1912 int noblock, int *errcode)
1913{
28d64271 1914 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1915}
2a91525c 1916EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1917
39771b12
WB		 1918int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
1919 struct sockcm_cookie *sockc)
1920{
3dd17e63
SHY		 1921 u32 tsflags;
1922
39771b12
WB		 1923 switch (cmsg->cmsg_type) {
1924 case SO_MARK:
1925 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1926 return -EPERM;
1927 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
1928 return -EINVAL;
1929 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
1930 break;
3dd17e63
SHY		 1931 case SO_TIMESTAMPING:
1932 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
1933 return -EINVAL;
1934
1935 tsflags = *(u32 *)CMSG_DATA(cmsg);
1936 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
1937 return -EINVAL;
1938
1939 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
1940 sockc->tsflags |= tsflags;
1941 break;
779f1ede
SHY		 1942 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
1943 case SCM_RIGHTS:
1944 case SCM_CREDENTIALS:
1945 break;
39771b12
WB		 1946 default:
1947 return -EINVAL;
1948 }
1949 return 0;
1950}
1951EXPORT_SYMBOL(__sock_cmsg_send);
1952
f28ea365
EJ		 1953int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
1954 struct sockcm_cookie *sockc)
1955{
1956 struct cmsghdr *cmsg;
39771b12 1957 int ret;
f28ea365
EJ		 1958
1959 for_each_cmsghdr(cmsg, msg) {
1960 if (!CMSG_OK(msg, cmsg))
1961 return -EINVAL;
1962 if (cmsg->cmsg_level != SOL_SOCKET)
1963 continue;
39771b12
WB		 1964 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
1965 if (ret)
1966 return ret;
f28ea365
EJ		 1967 }
1968 return 0;
1969}
1970EXPORT_SYMBOL(sock_cmsg_send);
1971
5640f768
ED		 1972/* On 32bit arches, an skb frag is limited to 2^15 */
1973#define SKB_FRAG_PAGE_ORDER get_order(32768)
1974
400dfd3a
ED		 1975/**
1976 * skb_page_frag_refill - check that a page_frag contains enough room
1977 * @sz: minimum size of the fragment we want to get
1978 * @pfrag: pointer to page_frag
82d5e2b8 1979 * @gfp: priority for memory allocation
400dfd3a
ED		 1980 *
1981 * Note: While this allocator tries to use high order pages, there is
1982 * no guarantee that allocations succeed. Therefore, @sz MUST be
1983 * less or equal than PAGE_SIZE.
1984 */
d9b2938a 1985bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 1986{
5640f768 1987 if (pfrag->page) {
fe896d18 1988 if (page_ref_count(pfrag->page) == 1) {
5640f768
ED		 1989 pfrag->offset = 0;
1990 return true;
1991 }
400dfd3a 1992 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1993 return true;
1994 put_page(pfrag->page);
1995 }
1996
d9b2938a
ED		 1997 pfrag->offset = 0;
1998 if (SKB_FRAG_PAGE_ORDER) {
d0164adc
MG		 1999 /* Avoid direct reclaim but allow kswapd to wake */
2000 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
2001 __GFP_COMP | __GFP_NOWARN |
2002 __GFP_NORETRY,
d9b2938a 2003 SKB_FRAG_PAGE_ORDER);
5640f768 2004 if (likely(pfrag->page)) {
d9b2938a 2005 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 2006 return true;
2007 }
d9b2938a
ED		 2008 }
2009 pfrag->page = alloc_page(gfp);
2010 if (likely(pfrag->page)) {
2011 pfrag->size = PAGE_SIZE;
2012 return true;
2013 }
400dfd3a
ED		 2014 return false;
2015}
2016EXPORT_SYMBOL(skb_page_frag_refill);
2017
2018bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2019{
2020 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2021 return true;
2022
5640f768
ED		 2023 sk_enter_memory_pressure(sk);
2024 sk_stream_moderate_sndbuf(sk);
2025 return false;
2026}
2027EXPORT_SYMBOL(sk_page_frag_refill);
2028
1da177e4 2029static void __lock_sock(struct sock *sk)
f39234d6
NK		 2030 __releases(&sk->sk_lock.slock)
2031 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 2032{
2033 DEFINE_WAIT(wait);
2034
e71a4783 2035 for (;;) {
1da177e4
LT		 2036 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2037 TASK_UNINTERRUPTIBLE);
2038 spin_unlock_bh(&sk->sk_lock.slock);
2039 schedule();
2040 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 2041 if (!sock_owned_by_user(sk))
1da177e4
LT		 2042 break;
2043 }
2044 finish_wait(&sk->sk_lock.wq, &wait);
2045}
2046
2047static void __release_sock(struct sock *sk)
f39234d6
NK		 2048 __releases(&sk->sk_lock.slock)
2049 __acquires(&sk->sk_lock.slock)
1da177e4 2050{
5413d1ba 2051 struct sk_buff *skb, *next;
1da177e4 2052
5413d1ba 2053 while ((skb = sk->sk_backlog.head) != NULL) {
1da177e4 2054 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1da177e4 2055
5413d1ba 2056 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4 2057
5413d1ba
ED		 2058 do {
2059 next = skb->next;
e4cbb02a 2060 prefetch(next);
7fee226a 2061 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 2062 skb->next = NULL;
c57943a1 2063 sk_backlog_rcv(sk, skb);
1da177e4 2064
5413d1ba 2065 cond_resched();
1da177e4
LT		 2066
2067 skb = next;
2068 } while (skb != NULL);
2069
5413d1ba
ED		 2070 spin_lock_bh(&sk->sk_lock.slock);
2071 }
8eae939f
ZY		 2072
2073 /*
2074 * Doing the zeroing here guarantee we can not loop forever
2075 * while a wild producer attempts to flood us.
2076 */
2077 sk->sk_backlog.len = 0;
1da177e4
LT		 2078}
2079
d41a69f1
ED		 2080void __sk_flush_backlog(struct sock *sk)
2081{
2082 spin_lock_bh(&sk->sk_lock.slock);
2083 __release_sock(sk);
2084 spin_unlock_bh(&sk->sk_lock.slock);
2085}
2086
1da177e4
LT		 2087/**
2088 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 2089 * @sk: sock to wait on
2090 * @timeo: for how long
dfbafc99 2091 * @skb: last skb seen on sk_receive_queue
1da177e4
LT		 2092 *
2093 * Now socket state including sk->sk_err is changed only under lock,
2094 * hence we may omit checks after joining wait queue.
2095 * We check receive queue before schedule() only as optimization;
2096 * it is very likely that release_sock() added new data.
2097 */
dfbafc99 2098int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
1da177e4
LT		 2099{
2100 int rc;
2101 DEFINE_WAIT(wait);
2102
aa395145 2103 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9cd3e072 2104 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
dfbafc99 2105 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb);
9cd3e072 2106 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
aa395145 2107 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 2108 return rc;
2109}
1da177e4
LT		 2110EXPORT_SYMBOL(sk_wait_data);
2111
3ab224be
HA		 2112/**
2113 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2114 * @sk: socket
2115 * @size: memory size to allocate
2116 * @kind: allocation type
2117 *
2118 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2119 * rmem allocation. This function assumes that protocols which have
2120 * memory_pressure use sk_wmem_queued as write buffer accounting.
2121 */
2122int __sk_mem_schedule(struct sock *sk, int size, int kind)
2123{
2124 struct proto *prot = sk->sk_prot;
2125 int amt = sk_mem_pages(size);
8d987e5c 2126 long allocated;
3ab224be
HA		 2127
2128 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 2129
e805605c
JW		 2130 allocated = sk_memory_allocated_add(sk, amt);
2131
baac50bb
JW		 2132 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2133 !mem_cgroup_charge_skmem(sk->sk_memcg, amt))
e805605c 2134 goto suppress_allocation;
3ab224be
HA		 2135
2136 /* Under limit. */
e805605c 2137 if (allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2138 sk_leave_memory_pressure(sk);
3ab224be
HA		 2139 return 1;
2140 }
2141
e805605c
JW		 2142 /* Under pressure. */
2143 if (allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2144 sk_enter_memory_pressure(sk);
3ab224be 2145
e805605c
JW		 2146 /* Over hard limit. */
2147 if (allocated > sk_prot_mem_limits(sk, 2))
3ab224be
HA		 2148 goto suppress_allocation;
2149
2150 /* guarantee minimum buffer size under pressure */
2151 if (kind == SK_MEM_RECV) {
2152 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2153 return 1;
180d8cd9 2154
3ab224be
HA		 2155 } else { /* SK_MEM_SEND */
2156 if (sk->sk_type == SOCK_STREAM) {
2157 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2158 return 1;
2159 } else if (atomic_read(&sk->sk_wmem_alloc) <
2160 prot->sysctl_wmem[0])
2161 return 1;
2162 }
2163
180d8cd9 2164 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2165 int alloc;
2166
180d8cd9 2167 if (!sk_under_memory_pressure(sk))
1748376b 2168 return 1;
180d8cd9
GC		 2169 alloc = sk_sockets_allocated_read_positive(sk);
2170 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2171 sk_mem_pages(sk->sk_wmem_queued +
2172 atomic_read(&sk->sk_rmem_alloc) +
2173 sk->sk_forward_alloc))
2174 return 1;
2175 }
2176
2177suppress_allocation:
2178
2179 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2180 sk_stream_moderate_sndbuf(sk);
2181
2182 /* Fail only if socket is _under_ its sndbuf.
2183 * In this case we cannot block, so that we have to fail.
2184 */
2185 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2186 return 1;
2187 }
2188
3847ce32
SM		 2189 trace_sock_exceed_buf_limit(sk, prot, allocated);
2190
3ab224be
HA		 2191 /* Alas. Undo changes. */
2192 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2193
0e90b31f 2194 sk_memory_allocated_sub(sk, amt);
180d8cd9 2195
baac50bb
JW		 2196 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2197 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
e805605c 2198
3ab224be
HA		 2199 return 0;
2200}
3ab224be
HA		 2201EXPORT_SYMBOL(__sk_mem_schedule);
2202
2203/**
69dba9bb 2204 * __sk_mem_reclaim - reclaim memory_allocated
3ab224be 2205 * @sk: socket
1a24e04e 2206 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
3ab224be 2207 */
1a24e04e 2208void __sk_mem_reclaim(struct sock *sk, int amount)
3ab224be 2209{
1a24e04e
ED		 2210 amount >>= SK_MEM_QUANTUM_SHIFT;
2211 sk_memory_allocated_sub(sk, amount);
2212 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
3ab224be 2213
baac50bb
JW		 2214 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2215 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
e805605c 2216
180d8cd9
GC		 2217 if (sk_under_memory_pressure(sk) &&
2218 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2219 sk_leave_memory_pressure(sk);
3ab224be 2220}
3ab224be
HA		 2221EXPORT_SYMBOL(__sk_mem_reclaim);
2222
627d2d6b 2223int sk_set_peek_off(struct sock *sk, int val)
2224{
2225 if (val < 0)
2226 return -EINVAL;
2227
2228 sk->sk_peek_off = val;
2229 return 0;
2230}
2231EXPORT_SYMBOL_GPL(sk_set_peek_off);
3ab224be 2232
1da177e4
LT		 2233/*
2234 * Set of default routines for initialising struct proto_ops when
2235 * the protocol does not support a particular function. In certain
2236 * cases where it makes no sense for a protocol to have a "do nothing"
2237 * function, some default processing is provided.
2238 */
2239
2240int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2241{
2242 return -EOPNOTSUPP;
2243}
2a91525c 2244EXPORT_SYMBOL(sock_no_bind);
1da177e4 2245
4ec93edb 2246int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2247 int len, int flags)
2248{
2249 return -EOPNOTSUPP;
2250}
2a91525c 2251EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2252
2253int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2254{
2255 return -EOPNOTSUPP;
2256}
2a91525c 2257EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2258
2259int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2260{
2261 return -EOPNOTSUPP;
2262}
2a91525c 2263EXPORT_SYMBOL(sock_no_accept);
1da177e4 2264
4ec93edb 2265int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2266 int *len, int peer)
2267{
2268 return -EOPNOTSUPP;
2269}
2a91525c 2270EXPORT_SYMBOL(sock_no_getname);
1da177e4 2271
2a91525c 2272unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2273{
2274 return 0;
2275}
2a91525c 2276EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2277
2278int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2279{
2280 return -EOPNOTSUPP;
2281}
2a91525c 2282EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2283
2284int sock_no_listen(struct socket *sock, int backlog)
2285{
2286 return -EOPNOTSUPP;
2287}
2a91525c 2288EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2289
2290int sock_no_shutdown(struct socket *sock, int how)
2291{
2292 return -EOPNOTSUPP;
2293}
2a91525c 2294EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2295
2296int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2297 char __user *optval, unsigned int optlen)
1da177e4
LT		 2298{
2299 return -EOPNOTSUPP;
2300}
2a91525c 2301EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2302
2303int sock_no_getsockopt(struct socket *sock, int level, int optname,
2304 char __user *optval, int __user *optlen)
2305{
2306 return -EOPNOTSUPP;
2307}
2a91525c 2308EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4 2309
1b784140 2310int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
1da177e4
LT		 2311{
2312 return -EOPNOTSUPP;
2313}
2a91525c 2314EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4 2315
1b784140
YX		 2316int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2317 int flags)
1da177e4
LT		 2318{
2319 return -EOPNOTSUPP;
2320}
2a91525c 2321EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2322
2323int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2324{
2325 /* Mirror missing mmap method error code */
2326 return -ENODEV;
2327}
2a91525c 2328EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2329
2330ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2331{
2332 ssize_t res;
2333 struct msghdr msg = {.msg_flags = flags};
2334 struct kvec iov;
2335 char *kaddr = kmap(page);
2336 iov.iov_base = kaddr + offset;
2337 iov.iov_len = size;
2338 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2339 kunmap(page);
2340 return res;
2341}
2a91525c 2342EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2343
2344/*
2345 * Default Socket Callbacks
2346 */
2347
2348static void sock_def_wakeup(struct sock *sk)
2349{
43815482
ED		 2350 struct socket_wq *wq;
2351
2352 rcu_read_lock();
2353 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2354 if (skwq_has_sleeper(wq))
43815482
ED		 2355 wake_up_interruptible_all(&wq->wait);
2356 rcu_read_unlock();
1da177e4
LT		 2357}
2358
2359static void sock_def_error_report(struct sock *sk)
2360{
43815482
ED		 2361 struct socket_wq *wq;
2362
2363 rcu_read_lock();
2364 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2365 if (skwq_has_sleeper(wq))
43815482 2366 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2367 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2368 rcu_read_unlock();
1da177e4
LT		 2369}
2370
676d2369 2371static void sock_def_readable(struct sock *sk)
1da177e4 2372{
43815482
ED		 2373 struct socket_wq *wq;
2374
2375 rcu_read_lock();
2376 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2377 if (skwq_has_sleeper(wq))
2c6607c6 2378 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2379 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2380 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2381 rcu_read_unlock();
1da177e4
LT		 2382}
2383
2384static void sock_def_write_space(struct sock *sk)
2385{
43815482
ED		 2386 struct socket_wq *wq;
2387
2388 rcu_read_lock();
1da177e4
LT		 2389
2390 /* Do not wake up a writer until he can make "significant"
2391 * progress. --DaveM
2392 */
e71a4783 2393 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482 2394 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2395 if (skwq_has_sleeper(wq))
43815482 2396 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2397 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2398
2399 /* Should agree with poll, otherwise some programs break */
2400 if (sock_writeable(sk))
8d8ad9d7 2401 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2402 }
2403
43815482 2404 rcu_read_unlock();
1da177e4
LT		 2405}
2406
2407static void sock_def_destruct(struct sock *sk)
2408{
1da177e4
LT		 2409}
2410
2411void sk_send_sigurg(struct sock *sk)
2412{
2413 if (sk->sk_socket && sk->sk_socket->file)
2414 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2415 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2416}
2a91525c 2417EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2418
2419void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2420 unsigned long expires)
2421{
2422 if (!mod_timer(timer, expires))
2423 sock_hold(sk);
2424}
1da177e4
LT		 2425EXPORT_SYMBOL(sk_reset_timer);
2426
2427void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2428{
25cc4ae9 2429 if (del_timer(timer))
1da177e4
LT		 2430 __sock_put(sk);
2431}
1da177e4
LT		 2432EXPORT_SYMBOL(sk_stop_timer);
2433
2434void sock_init_data(struct socket *sock, struct sock *sk)
2435{
2436 skb_queue_head_init(&sk->sk_receive_queue);
2437 skb_queue_head_init(&sk->sk_write_queue);
2438 skb_queue_head_init(&sk->sk_error_queue);
2439
2440 sk->sk_send_head = NULL;
2441
2442 init_timer(&sk->sk_timer);
4ec93edb 2443
1da177e4
LT		 2444 sk->sk_allocation = GFP_KERNEL;
2445 sk->sk_rcvbuf = sysctl_rmem_default;
2446 sk->sk_sndbuf = sysctl_wmem_default;
2447 sk->sk_state = TCP_CLOSE;
972692e0 2448 sk_set_socket(sk, sock);
1da177e4
LT		 2449
2450 sock_set_flag(sk, SOCK_ZAPPED);
2451
e71a4783 2452 if (sock) {
1da177e4 2453 sk->sk_type = sock->type;
43815482 2454 sk->sk_wq = sock->wq;
1da177e4
LT		 2455 sock->sk = sk;
2456 } else
43815482 2457 sk->sk_wq = NULL;
1da177e4 2458
1da177e4 2459 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2460 lockdep_set_class_and_name(&sk->sk_callback_lock,
2461 af_callback_keys + sk->sk_family,
2462 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2463
2464 sk->sk_state_change = sock_def_wakeup;
2465 sk->sk_data_ready = sock_def_readable;
2466 sk->sk_write_space = sock_def_write_space;
2467 sk->sk_error_report = sock_def_error_report;
2468 sk->sk_destruct = sock_def_destruct;
2469
5640f768
ED		 2470 sk->sk_frag.page = NULL;
2471 sk->sk_frag.offset = 0;
ef64a54f 2472 sk->sk_peek_off = -1;
1da177e4 2473
109f6e39
EB		 2474 sk->sk_peer_pid = NULL;
2475 sk->sk_peer_cred = NULL;
1da177e4
LT		 2476 sk->sk_write_pending = 0;
2477 sk->sk_rcvlowat = 1;
2478 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2479 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2480
f37f0afb 2481 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2482
e0d1095a 2483#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2484 sk->sk_napi_id = 0;
64b0dc51 2485 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2486#endif
2487
62748f32 2488 sk->sk_max_pacing_rate = ~0U;
7eec4174 2489 sk->sk_pacing_rate = ~0U;
70da268b 2490 sk->sk_incoming_cpu = -1;
4dc6dc71
ED		 2491 /*
2492 * Before updating sk_refcnt, we must commit prior changes to memory
2493 * (Documentation/RCU/rculist_nulls.txt for details)
2494 */
2495 smp_wmb();
1da177e4 2496 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2497 atomic_set(&sk->sk_drops, 0);
1da177e4 2498}
2a91525c 2499EXPORT_SYMBOL(sock_init_data);
1da177e4 2500
b5606c2d 2501void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2502{
2503 might_sleep();
a5b5bb9a 2504 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2505 if (sk->sk_lock.owned)
1da177e4 2506 __lock_sock(sk);
d2e9117c 2507 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2508 spin_unlock(&sk->sk_lock.slock);
2509 /*
2510 * The sk_lock has mutex_lock() semantics here:
2511 */
fcc70d5f 2512 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2513 local_bh_enable();
1da177e4 2514}
fcc70d5f 2515EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2516
b5606c2d 2517void release_sock(struct sock *sk)
1da177e4 2518{
a5b5bb9a 2519 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2520 if (sk->sk_backlog.tail)
2521 __release_sock(sk);
46d3ceab 2522
c3f9b018
ED		 2523 /* Warning : release_cb() might need to release sk ownership,
2524 * ie call sock_release_ownership(sk) before us.
2525 */
46d3ceab
ED		 2526 if (sk->sk_prot->release_cb)
2527 sk->sk_prot->release_cb(sk);
2528
c3f9b018 2529 sock_release_ownership(sk);
a5b5bb9a
IM		 2530 if (waitqueue_active(&sk->sk_lock.wq))
2531 wake_up(&sk->sk_lock.wq);
2532 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2533}
2534EXPORT_SYMBOL(release_sock);
2535
8a74ad60
ED		 2536/**
2537 * lock_sock_fast - fast version of lock_sock
2538 * @sk: socket
2539 *
2540 * This version should be used for very small section, where process wont block
2541 * return false if fast path is taken
2542 * sk_lock.slock locked, owned = 0, BH disabled
2543 * return true if slow path is taken
2544 * sk_lock.slock unlocked, owned = 1, BH enabled
2545 */
2546bool lock_sock_fast(struct sock *sk)
2547{
2548 might_sleep();
2549 spin_lock_bh(&sk->sk_lock.slock);
2550
2551 if (!sk->sk_lock.owned)
2552 /*
2553 * Note : We must disable BH
2554 */
2555 return false;
2556
2557 __lock_sock(sk);
2558 sk->sk_lock.owned = 1;
2559 spin_unlock(&sk->sk_lock.slock);
2560 /*
2561 * The sk_lock has mutex_lock() semantics here:
2562 */
2563 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2564 local_bh_enable();
2565 return true;
2566}
2567EXPORT_SYMBOL(lock_sock_fast);
2568
1da177e4 2569int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2570{
b7aa0bf7 2571 struct timeval tv;
1da177e4 2572 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2573 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2574 tv = ktime_to_timeval(sk->sk_stamp);
2575 if (tv.tv_sec == -1)
1da177e4 2576 return -ENOENT;
b7aa0bf7
ED		 2577 if (tv.tv_sec == 0) {
2578 sk->sk_stamp = ktime_get_real();
2579 tv = ktime_to_timeval(sk->sk_stamp);
2580 }
2581 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2582}
1da177e4
LT		 2583EXPORT_SYMBOL(sock_get_timestamp);
2584
ae40eb1e
ED		 2585int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2586{
2587 struct timespec ts;
2588 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2589 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2590 ts = ktime_to_timespec(sk->sk_stamp);
2591 if (ts.tv_sec == -1)
2592 return -ENOENT;
2593 if (ts.tv_sec == 0) {
2594 sk->sk_stamp = ktime_get_real();
2595 ts = ktime_to_timespec(sk->sk_stamp);
2596 }
2597 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2598}
2599EXPORT_SYMBOL(sock_get_timestampns);
2600
20d49473 2601void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2602{
20d49473 2603 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2604 unsigned long previous_flags = sk->sk_flags;
2605
20d49473
PO		 2606 sock_set_flag(sk, flag);
2607 /*
2608 * we just set one of the two flags which require net
2609 * time stamping, but time stamping might have been on
2610 * already because of the other one
2611 */
080a270f
HFS		 2612 if (sock_needs_netstamp(sk) &&
2613 !(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2614 net_enable_timestamp();
1da177e4
LT		 2615 }
2616}
1da177e4 2617
cb820f8e
RC		 2618int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2619 int level, int type)
2620{
2621 struct sock_exterr_skb *serr;
364a9e93 2622 struct sk_buff *skb;
cb820f8e
RC		 2623 int copied, err;
2624
2625 err = -EAGAIN;
364a9e93 2626 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 2627 if (skb == NULL)
2628 goto out;
2629
2630 copied = skb->len;
2631 if (copied > len) {
2632 msg->msg_flags |= MSG_TRUNC;
2633 copied = len;
2634 }
51f3d02b 2635 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 2636 if (err)
2637 goto out_free_skb;
2638
2639 sock_recv_timestamp(msg, sk, skb);
2640
2641 serr = SKB_EXT_ERR(skb);
2642 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2643
2644 msg->msg_flags |= MSG_ERRQUEUE;
2645 err = copied;
2646
cb820f8e
RC		 2647out_free_skb:
2648 kfree_skb(skb);
2649out:
2650 return err;
2651}
2652EXPORT_SYMBOL(sock_recv_errqueue);
2653
1da177e4
LT		 2654/*
2655 * Get a socket option on an socket.
2656 *
2657 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2658 * asynchronous errors should be reported by getsockopt. We assume
2659 * this means if you specify SO_ERROR (otherwise whats the point of it).
2660 */
2661int sock_common_getsockopt(struct socket *sock, int level, int optname,
2662 char __user *optval, int __user *optlen)
2663{
2664 struct sock *sk = sock->sk;
2665
2666 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2667}
1da177e4
LT		 2668EXPORT_SYMBOL(sock_common_getsockopt);
2669
3fdadf7d 2670#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2671int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2672 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2673{
2674 struct sock *sk = sock->sk;
2675
1e51f951 2676 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2677 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2678 optval, optlen);
3fdadf7d
DM		 2679 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2680}
2681EXPORT_SYMBOL(compat_sock_common_getsockopt);
2682#endif
2683
1b784140
YX		 2684int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2685 int flags)
1da177e4
LT		 2686{
2687 struct sock *sk = sock->sk;
2688 int addr_len = 0;
2689 int err;
2690
1b784140 2691 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
1da177e4
LT		 2692 flags & ~MSG_DONTWAIT, &addr_len);
2693 if (err >= 0)
2694 msg->msg_namelen = addr_len;
2695 return err;
2696}
1da177e4
LT		 2697EXPORT_SYMBOL(sock_common_recvmsg);
2698
2699/*
2700 * Set socket options on an inet socket.
2701 */
2702int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2703 char __user *optval, unsigned int optlen)
1da177e4
LT		 2704{
2705 struct sock *sk = sock->sk;
2706
2707 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2708}
1da177e4
LT		 2709EXPORT_SYMBOL(sock_common_setsockopt);
2710
3fdadf7d 2711#ifdef CONFIG_COMPAT
543d9cfe 2712int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2713 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2714{
2715 struct sock *sk = sock->sk;
2716
543d9cfe
ACM		 2717 if (sk->sk_prot->compat_setsockopt != NULL)
2718 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2719 optval, optlen);
3fdadf7d
DM		 2720 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2721}
2722EXPORT_SYMBOL(compat_sock_common_setsockopt);
2723#endif
2724
1da177e4
LT		 2725void sk_common_release(struct sock *sk)
2726{
2727 if (sk->sk_prot->destroy)
2728 sk->sk_prot->destroy(sk);
2729
2730 /*
2731 * Observation: when sock_common_release is called, processes have
2732 * no access to socket. But net still has.
2733 * Step one, detach it from networking:
2734 *
2735 * A. Remove from hash tables.
2736 */
2737
2738 sk->sk_prot->unhash(sk);
2739
2740 /*
2741 * In this point socket cannot receive new packets, but it is possible
2742 * that some packets are in flight because some CPU runs receiver and
2743 * did hash table lookup before we unhashed socket. They will achieve
2744 * receive queue and will be purged by socket destructor.
2745 *
2746 * Also we still have packets pending on receive queue and probably,
2747 * our own packets waiting in device queues. sock_destroy will drain
2748 * receive queue, but transmitted packets will delay socket destruction
2749 * until the last reference will be released.
2750 */
2751
2752 sock_orphan(sk);
2753
2754 xfrm_sk_free_policy(sk);
2755
e6848976 2756 sk_refcnt_debug_release(sk);
5640f768
ED		 2757
2758 if (sk->sk_frag.page) {
2759 put_page(sk->sk_frag.page);
2760 sk->sk_frag.page = NULL;
2761 }
2762
1da177e4
LT		 2763 sock_put(sk);
2764}
1da177e4
LT		 2765EXPORT_SYMBOL(sk_common_release);
2766
13ff3d6f
PE		 2767#ifdef CONFIG_PROC_FS
2768#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2769struct prot_inuse {
2770 int val[PROTO_INUSE_NR];
2771};
13ff3d6f
PE		 2772
2773static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2774
2775#ifdef CONFIG_NET_NS
2776void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2777{
d6d9ca0f 2778 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2779}
2780EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2781
2782int sock_prot_inuse_get(struct net *net, struct proto *prot)
2783{
2784 int cpu, idx = prot->inuse_idx;
2785 int res = 0;
2786
2787 for_each_possible_cpu(cpu)
2788 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2789
2790 return res >= 0 ? res : 0;
2791}
2792EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2793
2c8c1e72 2794static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2795{
2796 net->core.inuse = alloc_percpu(struct prot_inuse);
2797 return net->core.inuse ? 0 : -ENOMEM;
2798}
2799
2c8c1e72 2800static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2801{
2802 free_percpu(net->core.inuse);
2803}
2804
2805static struct pernet_operations net_inuse_ops = {
2806 .init = sock_inuse_init_net,
2807 .exit = sock_inuse_exit_net,
2808};
2809
2810static __init int net_inuse_init(void)
2811{
2812 if (register_pernet_subsys(&net_inuse_ops))
2813 panic("Cannot initialize net inuse counters");
2814
2815 return 0;
2816}
2817
2818core_initcall(net_inuse_init);
2819#else
1338d466
PE		 2820static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2821
c29a0bc4 2822void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2823{
d6d9ca0f 2824 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2825}
2826EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2827
c29a0bc4 2828int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2829{
2830 int cpu, idx = prot->inuse_idx;
2831 int res = 0;
2832
2833 for_each_possible_cpu(cpu)
2834 res += per_cpu(prot_inuse, cpu).val[idx];
2835
2836 return res >= 0 ? res : 0;
2837}
2838EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2839#endif
13ff3d6f
PE		 2840
2841static void assign_proto_idx(struct proto *prot)
2842{
2843 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2844
2845 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2846 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2847 return;
2848 }
2849
2850 set_bit(prot->inuse_idx, proto_inuse_idx);
2851}
2852
2853static void release_proto_idx(struct proto *prot)
2854{
2855 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2856 clear_bit(prot->inuse_idx, proto_inuse_idx);
2857}
2858#else
2859static inline void assign_proto_idx(struct proto *prot)
2860{
2861}
2862
2863static inline void release_proto_idx(struct proto *prot)
2864{
2865}
2866#endif
2867
0159dfd3
ED		 2868static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
2869{
2870 if (!rsk_prot)
2871 return;
2872 kfree(rsk_prot->slab_name);
2873 rsk_prot->slab_name = NULL;
adf78eda
JL		 2874 kmem_cache_destroy(rsk_prot->slab);
2875 rsk_prot->slab = NULL;
0159dfd3
ED		 2876}
2877
2878static int req_prot_init(const struct proto *prot)
2879{
2880 struct request_sock_ops *rsk_prot = prot->rsk_prot;
2881
2882 if (!rsk_prot)
2883 return 0;
2884
2885 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
2886 prot->name);
2887 if (!rsk_prot->slab_name)
2888 return -ENOMEM;
2889
2890 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
2891 rsk_prot->obj_size, 0,
e96f78ab 2892 prot->slab_flags, NULL);
0159dfd3
ED		 2893
2894 if (!rsk_prot->slab) {
2895 pr_crit("%s: Can't create request sock SLAB cache!\n",
2896 prot->name);
2897 return -ENOMEM;
2898 }
2899 return 0;
2900}
2901
b733c007
PE		 2902int proto_register(struct proto *prot, int alloc_slab)
2903{
1da177e4
LT		 2904 if (alloc_slab) {
2905 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2906 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2907 NULL);
1da177e4
LT		 2908
2909 if (prot->slab == NULL) {
e005d193
JP		 2910 pr_crit("%s: Can't create sock SLAB cache!\n",
2911 prot->name);
60e7663d 2912 goto out;
1da177e4 2913 }
2e6599cb 2914
0159dfd3
ED		 2915 if (req_prot_init(prot))
2916 goto out_free_request_sock_slab;
8feaf0c0 2917
6d6ee43e 2918 if (prot->twsk_prot != NULL) {
faf23422 2919 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2920
7e56b5d6 2921 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2922 goto out_free_request_sock_slab;
2923
6d6ee43e 2924 prot->twsk_prot->twsk_slab =
7e56b5d6 2925 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2926 prot->twsk_prot->twsk_obj_size,
3ab5aee7 2927 0,
52db70dc 2928 prot->slab_flags,
20c2df83 2929 NULL);
6d6ee43e 2930 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2931 goto out_free_timewait_sock_slab_name;
2932 }
1da177e4
LT		 2933 }
2934
36b77a52 2935 mutex_lock(&proto_list_mutex);
1da177e4 2936 list_add(&prot->node, &proto_list);
13ff3d6f 2937 assign_proto_idx(prot);
36b77a52 2938 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2939 return 0;
2940
8feaf0c0 2941out_free_timewait_sock_slab_name:
7e56b5d6 2942 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0 2943out_free_request_sock_slab:
0159dfd3
ED		 2944 req_prot_cleanup(prot->rsk_prot);
2945
2e6599cb
ACM		 2946 kmem_cache_destroy(prot->slab);
2947 prot->slab = NULL;
b733c007
PE		 2948out:
2949 return -ENOBUFS;
1da177e4 2950}
1da177e4
LT		 2951EXPORT_SYMBOL(proto_register);
2952
2953void proto_unregister(struct proto *prot)
2954{
36b77a52 2955 mutex_lock(&proto_list_mutex);
13ff3d6f 2956 release_proto_idx(prot);
0a3f4358 2957 list_del(&prot->node);
36b77a52 2958 mutex_unlock(&proto_list_mutex);
1da177e4 2959
adf78eda
JL		 2960 kmem_cache_destroy(prot->slab);
2961 prot->slab = NULL;
1da177e4 2962
0159dfd3 2963 req_prot_cleanup(prot->rsk_prot);
2e6599cb 2964
6d6ee43e 2965 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2966 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2967 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2968 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2969 }
1da177e4 2970}
1da177e4
LT		 2971EXPORT_SYMBOL(proto_unregister);
2972
2973#ifdef CONFIG_PROC_FS
1da177e4 2974static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2975 __acquires(proto_list_mutex)
1da177e4 2976{
36b77a52 2977 mutex_lock(&proto_list_mutex);
60f0438a 2978 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2979}
2980
2981static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2982{
60f0438a 2983 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2984}
2985
2986static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2987 __releases(proto_list_mutex)
1da177e4 2988{
36b77a52 2989 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2990}
2991
2992static char proto_method_implemented(const void *method)
2993{
2994 return method == NULL ? 'n' : 'y';
2995}
180d8cd9
GC		 2996static long sock_prot_memory_allocated(struct proto *proto)
2997{
cb75a36c 2998 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2999}
3000
3001static char *sock_prot_memory_pressure(struct proto *proto)
3002{
3003 return proto->memory_pressure != NULL ?
3004 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
3005}
1da177e4
LT		 3006
3007static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
3008{
180d8cd9 3009
8d987e5c 3010 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 3011 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3012 proto->name,
3013 proto->obj_size,
14e943db 3014 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 3015 sock_prot_memory_allocated(proto),
3016 sock_prot_memory_pressure(proto),
1da177e4
LT		 3017 proto->max_header,
3018 proto->slab == NULL ? "no" : "yes",
3019 module_name(proto->owner),
3020 proto_method_implemented(proto->close),
3021 proto_method_implemented(proto->connect),
3022 proto_method_implemented(proto->disconnect),
3023 proto_method_implemented(proto->accept),
3024 proto_method_implemented(proto->ioctl),
3025 proto_method_implemented(proto->init),
3026 proto_method_implemented(proto->destroy),
3027 proto_method_implemented(proto->shutdown),
3028 proto_method_implemented(proto->setsockopt),
3029 proto_method_implemented(proto->getsockopt),
3030 proto_method_implemented(proto->sendmsg),
3031 proto_method_implemented(proto->recvmsg),
3032 proto_method_implemented(proto->sendpage),
3033 proto_method_implemented(proto->bind),
3034 proto_method_implemented(proto->backlog_rcv),
3035 proto_method_implemented(proto->hash),
3036 proto_method_implemented(proto->unhash),
3037 proto_method_implemented(proto->get_port),
3038 proto_method_implemented(proto->enter_memory_pressure));
3039}
3040
3041static int proto_seq_show(struct seq_file *seq, void *v)
3042{
60f0438a 3043 if (v == &proto_list)
1da177e4
LT		 3044 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3045 "protocol",
3046 "size",
3047 "sockets",
3048 "memory",
3049 "press",
3050 "maxhdr",
3051 "slab",
3052 "module",
3053 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3054 else
60f0438a 3055 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 3056 return 0;
3057}
3058
f690808e 3059static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 3060 .start = proto_seq_start,
3061 .next = proto_seq_next,
3062 .stop = proto_seq_stop,
3063 .show = proto_seq_show,
3064};
3065
3066static int proto_seq_open(struct inode *inode, struct file *file)
3067{
14e943db
ED		 3068 return seq_open_net(inode, file, &proto_seq_ops,
3069 sizeof(struct seq_net_private));
1da177e4
LT		 3070}
3071
9a32144e 3072static const struct file_operations proto_seq_fops = {
1da177e4
LT		 3073 .owner = THIS_MODULE,
3074 .open = proto_seq_open,
3075 .read = seq_read,
3076 .llseek = seq_lseek,
14e943db
ED		 3077 .release = seq_release_net,
3078};
3079
3080static __net_init int proto_init_net(struct net *net)
3081{
d4beaa66 3082 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 3083 return -ENOMEM;
3084
3085 return 0;
3086}
3087
3088static __net_exit void proto_exit_net(struct net *net)
3089{
ece31ffd 3090 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 3091}
3092
3093
3094static __net_initdata struct pernet_operations proto_net_ops = {
3095 .init = proto_init_net,
3096 .exit = proto_exit_net,
1da177e4
LT		 3097};
3098
3099static int __init proto_init(void)
3100{
14e943db 3101 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 3102}
3103
3104subsys_initcall(proto_init);
3105
3106#endif /* PROC_FS */
Linux kernel - Deliverables
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