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Merge remote-tracking branch 'spi/for-next'
[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
2e4afe7b
PE		 1318static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1319 int family)
c308c1b2
PE		 1320{
1321 struct sock *sk;
1322 struct kmem_cache *slab;
1323
1324 slab = prot->slab;
e912b114
ED		 1325 if (slab != NULL) {
1326 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1327 if (!sk)
1328 return sk;
ba2489b0
ED		 1329 if (priority & __GFP_ZERO)
1330 sk_prot_clear_nulls(sk, prot->obj_size);
fcbdf09d 1331 } else
c308c1b2
PE		 1332 sk = kmalloc(prot->obj_size, priority);
1333
2e4afe7b 1334 if (sk != NULL) {
a98b65a3
VN		 1335 kmemcheck_annotate_bitfield(sk, flags);
1336
2e4afe7b
PE		 1337 if (security_sk_alloc(sk, family, priority))
1338 goto out_free;
1339
1340 if (!try_module_get(prot->owner))
1341 goto out_free_sec;
e022f0b4 1342 sk_tx_queue_clear(sk);
bd1060a1 1343 cgroup_sk_alloc(&sk->sk_cgrp_data);
2e4afe7b
PE		 1344 }
1345
c308c1b2 1346 return sk;
2e4afe7b
PE		 1347
1348out_free_sec:
1349 security_sk_free(sk);
1350out_free:
1351 if (slab != NULL)
1352 kmem_cache_free(slab, sk);
1353 else
1354 kfree(sk);
1355 return NULL;
c308c1b2
PE		 1356}
1357
1358static void sk_prot_free(struct proto *prot, struct sock *sk)
1359{
1360 struct kmem_cache *slab;
2e4afe7b 1361 struct module *owner;
c308c1b2 1362
2e4afe7b 1363 owner = prot->owner;
c308c1b2 1364 slab = prot->slab;
2e4afe7b 1365
bd1060a1 1366 cgroup_sk_free(&sk->sk_cgrp_data);
2e4afe7b 1367 security_sk_free(sk);
c308c1b2
PE		 1368 if (slab != NULL)
1369 kmem_cache_free(slab, sk);
1370 else
1371 kfree(sk);
2e4afe7b 1372 module_put(owner);
c308c1b2
PE		 1373}
1374
1da177e4
LT		 1375/**
1376 * sk_alloc - All socket objects are allocated here
c4ea43c5 1377 * @net: the applicable net namespace
4dc3b16b
PP		 1378 * @family: protocol family
1379 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1380 * @prot: struct proto associated with this new sock instance
11aa9c28 1381 * @kern: is this to be a kernel socket?
1da177e4 1382 */
1b8d7ae4 1383struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
11aa9c28 1384 struct proto *prot, int kern)
1da177e4 1385{
c308c1b2 1386 struct sock *sk;
1da177e4 1387
154adbc8 1388 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1389 if (sk) {
154adbc8
PE		 1390 sk->sk_family = family;
1391 /*
1392 * See comment in struct sock definition to understand
1393 * why we need sk_prot_creator -acme
1394 */
1395 sk->sk_prot = sk->sk_prot_creator = prot;
1396 sock_lock_init(sk);
26abe143
EB		 1397 sk->sk_net_refcnt = kern ? 0 : 1;
1398 if (likely(sk->sk_net_refcnt))
1399 get_net(net);
1400 sock_net_set(sk, net);
d66ee058 1401 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1402
2a56a1fe
TH		 1403 sock_update_classid(&sk->sk_cgrp_data);
1404 sock_update_netprioidx(&sk->sk_cgrp_data);
1da177e4 1405 }
a79af59e 1406
2e4afe7b 1407 return sk;
1da177e4 1408}
2a91525c 1409EXPORT_SYMBOL(sk_alloc);
1da177e4 1410
a4298e45
ED		 1411/* Sockets having SOCK_RCU_FREE will call this function after one RCU
1412 * grace period. This is the case for UDP sockets and TCP listeners.
1413 */
1414static void __sk_destruct(struct rcu_head *head)
1da177e4 1415{
a4298e45 1416 struct sock *sk = container_of(head, struct sock, sk_rcu);
1da177e4 1417 struct sk_filter *filter;
1da177e4
LT		 1418
1419 if (sk->sk_destruct)
1420 sk->sk_destruct(sk);
1421
a898def2
PM		 1422 filter = rcu_dereference_check(sk->sk_filter,
1423 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1424 if (filter) {
309dd5fc 1425 sk_filter_uncharge(sk, filter);
a9b3cd7f 1426 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4 1427 }
538950a1
CG		 1428 if (rcu_access_pointer(sk->sk_reuseport_cb))
1429 reuseport_detach_sock(sk);
1da177e4 1430
08e29af3 1431 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1432
1433 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1434 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1435 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1436
109f6e39
EB		 1437 if (sk->sk_peer_cred)
1438 put_cred(sk->sk_peer_cred);
1439 put_pid(sk->sk_peer_pid);
26abe143
EB		 1440 if (likely(sk->sk_net_refcnt))
1441 put_net(sock_net(sk));
c308c1b2 1442 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1443}
2b85a34e 1444
a4298e45
ED		 1445void sk_destruct(struct sock *sk)
1446{
1447 if (sock_flag(sk, SOCK_RCU_FREE))
1448 call_rcu(&sk->sk_rcu, __sk_destruct);
1449 else
1450 __sk_destruct(&sk->sk_rcu);
1451}
1452
eb4cb008
CG		 1453static void __sk_free(struct sock *sk)
1454{
b922622e 1455 if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt))
eb4cb008
CG		 1456 sock_diag_broadcast_destroy(sk);
1457 else
1458 sk_destruct(sk);
1459}
1460
2b85a34e
ED		 1461void sk_free(struct sock *sk)
1462{
1463 /*
25985edc 1464 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1465 * some packets are still in some tx queue.
1466 * If not null, sock_wfree() will call __sk_free(sk) later
1467 */
1468 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1469 __sk_free(sk);
1470}
2a91525c 1471EXPORT_SYMBOL(sk_free);
1da177e4 1472
e56c57d0
ED		 1473/**
1474 * sk_clone_lock - clone a socket, and lock its clone
1475 * @sk: the socket to clone
1476 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1477 *
1478 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1479 */
1480struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1481{
8fd1d178 1482 struct sock *newsk;
278571ba 1483 bool is_charged = true;
87d11ceb 1484
8fd1d178 1485 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1486 if (newsk != NULL) {
1487 struct sk_filter *filter;
1488
892c141e 1489 sock_copy(newsk, sk);
87d11ceb
ACM		 1490
1491 /* SANITY */
8a681736
SV		 1492 if (likely(newsk->sk_net_refcnt))
1493 get_net(sock_net(newsk));
87d11ceb
ACM		 1494 sk_node_init(&newsk->sk_node);
1495 sock_lock_init(newsk);
1496 bh_lock_sock(newsk);
fa438ccf 1497 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1498 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1499
1500 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1501 /*
1502 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1503 */
1504 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1505 atomic_set(&newsk->sk_omem_alloc, 0);
1506 skb_queue_head_init(&newsk->sk_receive_queue);
1507 skb_queue_head_init(&newsk->sk_write_queue);
1508
87d11ceb 1509 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1510 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1511 af_callback_keys + newsk->sk_family,
1512 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1513
1514 newsk->sk_dst_cache = NULL;
1515 newsk->sk_wmem_queued = 0;
1516 newsk->sk_forward_alloc = 0;
9caad864 1517 atomic_set(&newsk->sk_drops, 0);
87d11ceb 1518 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1519 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1520
1521 sock_reset_flag(newsk, SOCK_DONE);
1522 skb_queue_head_init(&newsk->sk_error_queue);
1523
0d7da9dd 1524 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb 1525 if (filter != NULL)
278571ba
AS		 1526 /* though it's an empty new sock, the charging may fail
1527 * if sysctl_optmem_max was changed between creation of
1528 * original socket and cloning
1529 */
1530 is_charged = sk_filter_charge(newsk, filter);
87d11ceb 1531
d188ba86 1532 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
87d11ceb
ACM		 1533 /* It is still raw copy of parent, so invalidate
1534 * destructor and make plain sk_free() */
1535 newsk->sk_destruct = NULL;
b0691c8e 1536 bh_unlock_sock(newsk);
87d11ceb
ACM		 1537 sk_free(newsk);
1538 newsk = NULL;
1539 goto out;
1540 }
fa463497 1541 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
87d11ceb
ACM		 1542
1543 newsk->sk_err = 0;
1544 newsk->sk_priority = 0;
2c8c56e1 1545 newsk->sk_incoming_cpu = raw_smp_processor_id();
33cf7c90 1546 atomic64_set(&newsk->sk_cookie, 0);
4dc6dc71
ED		 1547 /*
1548 * Before updating sk_refcnt, we must commit prior changes to memory
1549 * (Documentation/RCU/rculist_nulls.txt for details)
1550 */
1551 smp_wmb();
87d11ceb
ACM		 1552 atomic_set(&newsk->sk_refcnt, 2);
1553
1554 /*
1555 * Increment the counter in the same struct proto as the master
1556 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1557 * is the same as sk->sk_prot->socks, as this field was copied
1558 * with memcpy).
1559 *
1560 * This _changes_ the previous behaviour, where
1561 * tcp_create_openreq_child always was incrementing the
1562 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1563 * to be taken into account in all callers. -acme
1564 */
1565 sk_refcnt_debug_inc(newsk);
972692e0 1566 sk_set_socket(newsk, NULL);
43815482 1567 newsk->sk_wq = NULL;
87d11ceb 1568
baac50bb 1569 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
3d596f7b 1570 sock_update_memcg(newsk);
f3f511e1 1571
87d11ceb 1572 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1573 sk_sockets_allocated_inc(newsk);
704da560 1574
080a270f
HFS		 1575 if (sock_needs_netstamp(sk) &&
1576 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1577 net_enable_timestamp();
87d11ceb
ACM		 1578 }
1579out:
1580 return newsk;
1581}
e56c57d0 1582EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1583
9958089a
AK		 1584void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1585{
d6a4e26a
ED		 1586 u32 max_segs = 1;
1587
6bd4f355 1588 sk_dst_set(sk, dst);
9958089a
AK		 1589 sk->sk_route_caps = dst->dev->features;
1590 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1591 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1592 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1593 if (sk_can_gso(sk)) {
82cc1a7a 1594 if (dst->header_len) {
9958089a 1595 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1596 } else {
9958089a 1597 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1598 sk->sk_gso_max_size = dst->dev->gso_max_size;
d6a4e26a 1599 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
82cc1a7a 1600 }
9958089a 1601 }
d6a4e26a 1602 sk->sk_gso_max_segs = max_segs;
9958089a
AK		 1603}
1604EXPORT_SYMBOL_GPL(sk_setup_caps);
1605
1da177e4
LT		 1606/*
1607 * Simple resource managers for sockets.
1608 */
1609
1610
4ec93edb
YH		 1611/*
1612 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1613 */
1614void sock_wfree(struct sk_buff *skb)
1615{
1616 struct sock *sk = skb->sk;
d99927f4 1617 unsigned int len = skb->truesize;
1da177e4 1618
d99927f4
ED		 1619 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1620 /*
1621 * Keep a reference on sk_wmem_alloc, this will be released
1622 * after sk_write_space() call
1623 */
1624 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1625 sk->sk_write_space(sk);
d99927f4
ED		 1626 len = 1;
1627 }
2b85a34e 1628 /*
d99927f4
ED		 1629 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1630 * could not do because of in-flight packets
2b85a34e 1631 */
d99927f4 1632 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1633 __sk_free(sk);
1da177e4 1634}
2a91525c 1635EXPORT_SYMBOL(sock_wfree);
1da177e4 1636
1d2077ac
ED		 1637/* This variant of sock_wfree() is used by TCP,
1638 * since it sets SOCK_USE_WRITE_QUEUE.
1639 */
1640void __sock_wfree(struct sk_buff *skb)
1641{
1642 struct sock *sk = skb->sk;
1643
1644 if (atomic_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
1645 __sk_free(sk);
1646}
1647
9e17f8a4
ED		 1648void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1649{
1650 skb_orphan(skb);
1651 skb->sk = sk;
1652#ifdef CONFIG_INET
1653 if (unlikely(!sk_fullsock(sk))) {
1654 skb->destructor = sock_edemux;
1655 sock_hold(sk);
1656 return;
1657 }
1658#endif
1659 skb->destructor = sock_wfree;
1660 skb_set_hash_from_sk(skb, sk);
1661 /*
1662 * We used to take a refcount on sk, but following operation
1663 * is enough to guarantee sk_free() wont free this sock until
1664 * all in-flight packets are completed
1665 */
1666 atomic_add(skb->truesize, &sk->sk_wmem_alloc);
1667}
1668EXPORT_SYMBOL(skb_set_owner_w);
1669
1d2077ac
ED		 1670/* This helper is used by netem, as it can hold packets in its
1671 * delay queue. We want to allow the owner socket to send more
1672 * packets, as if they were already TX completed by a typical driver.
1673 * But we also want to keep skb->sk set because some packet schedulers
1674 * rely on it (sch_fq for example). So we set skb->truesize to a small
1675 * amount (1) and decrease sk_wmem_alloc accordingly.
1676 */
f2f872f9
ED		 1677void skb_orphan_partial(struct sk_buff *skb)
1678{
1d2077ac
ED		 1679 /* If this skb is a TCP pure ACK or already went here,
1680 * we have nothing to do. 2 is already a very small truesize.
1681 */
1682 if (skb->truesize <= 2)
1683 return;
1684
f2f872f9
ED		 1685 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1686 * so we do not completely orphan skb, but transfert all
1687 * accounted bytes but one, to avoid unexpected reorders.
1688 */
1689 if (skb->destructor == sock_wfree
1690#ifdef CONFIG_INET
1691 || skb->destructor == tcp_wfree
1692#endif
1693 ) {
1694 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1695 skb->truesize = 1;
1696 } else {
1697 skb_orphan(skb);
1698 }
1699}
1700EXPORT_SYMBOL(skb_orphan_partial);
1701
4ec93edb
YH		 1702/*
1703 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1704 */
1705void sock_rfree(struct sk_buff *skb)
1706{
1707 struct sock *sk = skb->sk;
d361fd59 1708 unsigned int len = skb->truesize;
1da177e4 1709
d361fd59
ED		 1710 atomic_sub(len, &sk->sk_rmem_alloc);
1711 sk_mem_uncharge(sk, len);
1da177e4 1712}
2a91525c 1713EXPORT_SYMBOL(sock_rfree);
1da177e4 1714
7768eed8
OH		 1715/*
1716 * Buffer destructor for skbs that are not used directly in read or write
1717 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1718 */
62bccb8c
AD		 1719void sock_efree(struct sk_buff *skb)
1720{
1721 sock_put(skb->sk);
1722}
1723EXPORT_SYMBOL(sock_efree);
1724
976d0201 1725kuid_t sock_i_uid(struct sock *sk)
1da177e4 1726{
976d0201 1727 kuid_t uid;
1da177e4 1728
f064af1e 1729 read_lock_bh(&sk->sk_callback_lock);
976d0201 1730 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1731 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1732 return uid;
1733}
2a91525c 1734EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1735
1736unsigned long sock_i_ino(struct sock *sk)
1737{
1738 unsigned long ino;
1739
f064af1e 1740 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1741 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1742 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1743 return ino;
1744}
2a91525c 1745EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1746
1747/*
1748 * Allocate a skb from the socket's send buffer.
1749 */
86a76caf 1750struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1751 gfp_t priority)
1da177e4
LT		 1752{
1753 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1754 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1755 if (skb) {
1756 skb_set_owner_w(skb, sk);
1757 return skb;
1758 }
1759 }
1760 return NULL;
1761}
2a91525c 1762EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1763
4ec93edb 1764/*
1da177e4 1765 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1766 */
dd0fc66f 1767void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1768{
95c96174 1769 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1770 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1771 void *mem;
1772 /* First do the add, to avoid the race if kmalloc
4ec93edb 1773 * might sleep.
1da177e4
LT		 1774 */
1775 atomic_add(size, &sk->sk_omem_alloc);
1776 mem = kmalloc(size, priority);
1777 if (mem)
1778 return mem;
1779 atomic_sub(size, &sk->sk_omem_alloc);
1780 }
1781 return NULL;
1782}
2a91525c 1783EXPORT_SYMBOL(sock_kmalloc);
1da177e4 1784
79e88659
DB		 1785/* Free an option memory block. Note, we actually want the inline
1786 * here as this allows gcc to detect the nullify and fold away the
1787 * condition entirely.
1da177e4 1788 */
79e88659
DB		 1789static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1790 const bool nullify)
1da177e4 1791{
e53da5fb
DM		 1792 if (WARN_ON_ONCE(!mem))
1793 return;
79e88659
DB		 1794 if (nullify)
1795 kzfree(mem);
1796 else
1797 kfree(mem);
1da177e4
LT		 1798 atomic_sub(size, &sk->sk_omem_alloc);
1799}
79e88659
DB		 1800
1801void sock_kfree_s(struct sock *sk, void *mem, int size)
1802{
1803 __sock_kfree_s(sk, mem, size, false);
1804}
2a91525c 1805EXPORT_SYMBOL(sock_kfree_s);
1da177e4 1806
79e88659
DB		 1807void sock_kzfree_s(struct sock *sk, void *mem, int size)
1808{
1809 __sock_kfree_s(sk, mem, size, true);
1810}
1811EXPORT_SYMBOL(sock_kzfree_s);
1812
1da177e4
LT		 1813/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1814 I think, these locks should be removed for datagram sockets.
1815 */
2a91525c 1816static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1817{
1818 DEFINE_WAIT(wait);
1819
9cd3e072 1820 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1da177e4
LT		 1821 for (;;) {
1822 if (!timeo)
1823 break;
1824 if (signal_pending(current))
1825 break;
1826 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1827 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1828 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1829 break;
1830 if (sk->sk_shutdown & SEND_SHUTDOWN)
1831 break;
1832 if (sk->sk_err)
1833 break;
1834 timeo = schedule_timeout(timeo);
1835 }
aa395145 1836 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1837 return timeo;
1838}
1839
1840
1841/*
1842 * Generic send/receive buffer handlers
1843 */
1844
4cc7f68d
HX		 1845struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1846 unsigned long data_len, int noblock,
28d64271 1847 int *errcode, int max_page_order)
1da177e4 1848{
2e4e4410 1849 struct sk_buff *skb;
1da177e4
LT		 1850 long timeo;
1851 int err;
1852
1da177e4 1853 timeo = sock_sndtimeo(sk, noblock);
2e4e4410 1854 for (;;) {
1da177e4
LT		 1855 err = sock_error(sk);
1856 if (err != 0)
1857 goto failure;
1858
1859 err = -EPIPE;
1860 if (sk->sk_shutdown & SEND_SHUTDOWN)
1861 goto failure;
1862
2e4e4410
ED		 1863 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
1864 break;
28d64271 1865
9cd3e072 1866 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2e4e4410
ED		 1867 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1868 err = -EAGAIN;
1869 if (!timeo)
1da177e4 1870 goto failure;
2e4e4410
ED		 1871 if (signal_pending(current))
1872 goto interrupted;
1873 timeo = sock_wait_for_wmem(sk, timeo);
1da177e4 1874 }
2e4e4410
ED		 1875 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
1876 errcode, sk->sk_allocation);
1877 if (skb)
1878 skb_set_owner_w(skb, sk);
1da177e4
LT		 1879 return skb;
1880
1881interrupted:
1882 err = sock_intr_errno(timeo);
1883failure:
1884 *errcode = err;
1885 return NULL;
1886}
4cc7f68d 1887EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1888
4ec93edb 1889struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1890 int noblock, int *errcode)
1891{
28d64271 1892 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1893}
2a91525c 1894EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1895
39771b12
WB		 1896int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
1897 struct sockcm_cookie *sockc)
1898{
3dd17e63
SHY		 1899 u32 tsflags;
1900
39771b12
WB		 1901 switch (cmsg->cmsg_type) {
1902 case SO_MARK:
1903 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1904 return -EPERM;
1905 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
1906 return -EINVAL;
1907 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
1908 break;
3dd17e63
SHY		 1909 case SO_TIMESTAMPING:
1910 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
1911 return -EINVAL;
1912
1913 tsflags = *(u32 *)CMSG_DATA(cmsg);
1914 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
1915 return -EINVAL;
1916
1917 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
1918 sockc->tsflags |= tsflags;
1919 break;
779f1ede
SHY		 1920 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
1921 case SCM_RIGHTS:
1922 case SCM_CREDENTIALS:
1923 break;
39771b12
WB		 1924 default:
1925 return -EINVAL;
1926 }
1927 return 0;
1928}
1929EXPORT_SYMBOL(__sock_cmsg_send);
1930
f28ea365
EJ		 1931int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
1932 struct sockcm_cookie *sockc)
1933{
1934 struct cmsghdr *cmsg;
39771b12 1935 int ret;
f28ea365
EJ		 1936
1937 for_each_cmsghdr(cmsg, msg) {
1938 if (!CMSG_OK(msg, cmsg))
1939 return -EINVAL;
1940 if (cmsg->cmsg_level != SOL_SOCKET)
1941 continue;
39771b12
WB		 1942 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
1943 if (ret)
1944 return ret;
f28ea365
EJ		 1945 }
1946 return 0;
1947}
1948EXPORT_SYMBOL(sock_cmsg_send);
1949
5640f768
ED		 1950/* On 32bit arches, an skb frag is limited to 2^15 */
1951#define SKB_FRAG_PAGE_ORDER get_order(32768)
1952
400dfd3a
ED		 1953/**
1954 * skb_page_frag_refill - check that a page_frag contains enough room
1955 * @sz: minimum size of the fragment we want to get
1956 * @pfrag: pointer to page_frag
82d5e2b8 1957 * @gfp: priority for memory allocation
400dfd3a
ED		 1958 *
1959 * Note: While this allocator tries to use high order pages, there is
1960 * no guarantee that allocations succeed. Therefore, @sz MUST be
1961 * less or equal than PAGE_SIZE.
1962 */
d9b2938a 1963bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 1964{
5640f768 1965 if (pfrag->page) {
fe896d18 1966 if (page_ref_count(pfrag->page) == 1) {
5640f768
ED		 1967 pfrag->offset = 0;
1968 return true;
1969 }
400dfd3a 1970 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1971 return true;
1972 put_page(pfrag->page);
1973 }
1974
d9b2938a
ED		 1975 pfrag->offset = 0;
1976 if (SKB_FRAG_PAGE_ORDER) {
d0164adc
MG		 1977 /* Avoid direct reclaim but allow kswapd to wake */
1978 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
1979 __GFP_COMP | __GFP_NOWARN |
1980 __GFP_NORETRY,
d9b2938a 1981 SKB_FRAG_PAGE_ORDER);
5640f768 1982 if (likely(pfrag->page)) {
d9b2938a 1983 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 1984 return true;
1985 }
d9b2938a
ED		 1986 }
1987 pfrag->page = alloc_page(gfp);
1988 if (likely(pfrag->page)) {
1989 pfrag->size = PAGE_SIZE;
1990 return true;
1991 }
400dfd3a
ED		 1992 return false;
1993}
1994EXPORT_SYMBOL(skb_page_frag_refill);
1995
1996bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1997{
1998 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1999 return true;
2000
5640f768
ED		 2001 sk_enter_memory_pressure(sk);
2002 sk_stream_moderate_sndbuf(sk);
2003 return false;
2004}
2005EXPORT_SYMBOL(sk_page_frag_refill);
2006
1da177e4 2007static void __lock_sock(struct sock *sk)
f39234d6
NK		 2008 __releases(&sk->sk_lock.slock)
2009 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 2010{
2011 DEFINE_WAIT(wait);
2012
e71a4783 2013 for (;;) {
1da177e4
LT		 2014 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2015 TASK_UNINTERRUPTIBLE);
2016 spin_unlock_bh(&sk->sk_lock.slock);
2017 schedule();
2018 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 2019 if (!sock_owned_by_user(sk))
1da177e4
LT		 2020 break;
2021 }
2022 finish_wait(&sk->sk_lock.wq, &wait);
2023}
2024
2025static void __release_sock(struct sock *sk)
f39234d6
NK		 2026 __releases(&sk->sk_lock.slock)
2027 __acquires(&sk->sk_lock.slock)
1da177e4 2028{
5413d1ba 2029 struct sk_buff *skb, *next;
1da177e4 2030
5413d1ba 2031 while ((skb = sk->sk_backlog.head) != NULL) {
1da177e4 2032 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1da177e4 2033
5413d1ba 2034 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4 2035
5413d1ba
ED		 2036 do {
2037 next = skb->next;
e4cbb02a 2038 prefetch(next);
7fee226a 2039 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 2040 skb->next = NULL;
c57943a1 2041 sk_backlog_rcv(sk, skb);
1da177e4 2042
5413d1ba 2043 cond_resched();
1da177e4
LT		 2044
2045 skb = next;
2046 } while (skb != NULL);
2047
5413d1ba
ED		 2048 spin_lock_bh(&sk->sk_lock.slock);
2049 }
8eae939f
ZY		 2050
2051 /*
2052 * Doing the zeroing here guarantee we can not loop forever
2053 * while a wild producer attempts to flood us.
2054 */
2055 sk->sk_backlog.len = 0;
1da177e4
LT		 2056}
2057
d41a69f1
ED		 2058void __sk_flush_backlog(struct sock *sk)
2059{
2060 spin_lock_bh(&sk->sk_lock.slock);
2061 __release_sock(sk);
2062 spin_unlock_bh(&sk->sk_lock.slock);
2063}
2064
1da177e4
LT		 2065/**
2066 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 2067 * @sk: sock to wait on
2068 * @timeo: for how long
dfbafc99 2069 * @skb: last skb seen on sk_receive_queue
1da177e4
LT		 2070 *
2071 * Now socket state including sk->sk_err is changed only under lock,
2072 * hence we may omit checks after joining wait queue.
2073 * We check receive queue before schedule() only as optimization;
2074 * it is very likely that release_sock() added new data.
2075 */
dfbafc99 2076int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
1da177e4
LT		 2077{
2078 int rc;
2079 DEFINE_WAIT(wait);
2080
aa395145 2081 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9cd3e072 2082 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
dfbafc99 2083 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb);
9cd3e072 2084 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
aa395145 2085 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 2086 return rc;
2087}
1da177e4
LT		 2088EXPORT_SYMBOL(sk_wait_data);
2089
3ab224be
HA		 2090/**
2091 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2092 * @sk: socket
2093 * @size: memory size to allocate
2094 * @kind: allocation type
2095 *
2096 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2097 * rmem allocation. This function assumes that protocols which have
2098 * memory_pressure use sk_wmem_queued as write buffer accounting.
2099 */
2100int __sk_mem_schedule(struct sock *sk, int size, int kind)
2101{
2102 struct proto *prot = sk->sk_prot;
2103 int amt = sk_mem_pages(size);
8d987e5c 2104 long allocated;
3ab224be
HA		 2105
2106 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 2107
e805605c
JW		 2108 allocated = sk_memory_allocated_add(sk, amt);
2109
baac50bb
JW		 2110 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2111 !mem_cgroup_charge_skmem(sk->sk_memcg, amt))
e805605c 2112 goto suppress_allocation;
3ab224be
HA		 2113
2114 /* Under limit. */
e805605c 2115 if (allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2116 sk_leave_memory_pressure(sk);
3ab224be
HA		 2117 return 1;
2118 }
2119
e805605c
JW		 2120 /* Under pressure. */
2121 if (allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2122 sk_enter_memory_pressure(sk);
3ab224be 2123
e805605c
JW		 2124 /* Over hard limit. */
2125 if (allocated > sk_prot_mem_limits(sk, 2))
3ab224be
HA		 2126 goto suppress_allocation;
2127
2128 /* guarantee minimum buffer size under pressure */
2129 if (kind == SK_MEM_RECV) {
2130 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2131 return 1;
180d8cd9 2132
3ab224be
HA		 2133 } else { /* SK_MEM_SEND */
2134 if (sk->sk_type == SOCK_STREAM) {
2135 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2136 return 1;
2137 } else if (atomic_read(&sk->sk_wmem_alloc) <
2138 prot->sysctl_wmem[0])
2139 return 1;
2140 }
2141
180d8cd9 2142 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2143 int alloc;
2144
180d8cd9 2145 if (!sk_under_memory_pressure(sk))
1748376b 2146 return 1;
180d8cd9
GC		 2147 alloc = sk_sockets_allocated_read_positive(sk);
2148 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2149 sk_mem_pages(sk->sk_wmem_queued +
2150 atomic_read(&sk->sk_rmem_alloc) +
2151 sk->sk_forward_alloc))
2152 return 1;
2153 }
2154
2155suppress_allocation:
2156
2157 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2158 sk_stream_moderate_sndbuf(sk);
2159
2160 /* Fail only if socket is _under_ its sndbuf.
2161 * In this case we cannot block, so that we have to fail.
2162 */
2163 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2164 return 1;
2165 }
2166
3847ce32
SM		 2167 trace_sock_exceed_buf_limit(sk, prot, allocated);
2168
3ab224be
HA		 2169 /* Alas. Undo changes. */
2170 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2171
0e90b31f 2172 sk_memory_allocated_sub(sk, amt);
180d8cd9 2173
baac50bb
JW		 2174 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2175 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
e805605c 2176
3ab224be
HA		 2177 return 0;
2178}
3ab224be
HA		 2179EXPORT_SYMBOL(__sk_mem_schedule);
2180
2181/**
69dba9bb 2182 * __sk_mem_reclaim - reclaim memory_allocated
3ab224be 2183 * @sk: socket
1a24e04e 2184 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
3ab224be 2185 */
1a24e04e 2186void __sk_mem_reclaim(struct sock *sk, int amount)
3ab224be 2187{
1a24e04e
ED		 2188 amount >>= SK_MEM_QUANTUM_SHIFT;
2189 sk_memory_allocated_sub(sk, amount);
2190 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
3ab224be 2191
baac50bb
JW		 2192 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2193 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
e805605c 2194
180d8cd9
GC		 2195 if (sk_under_memory_pressure(sk) &&
2196 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2197 sk_leave_memory_pressure(sk);
3ab224be 2198}
3ab224be
HA		 2199EXPORT_SYMBOL(__sk_mem_reclaim);
2200
627d2d6b 2201int sk_set_peek_off(struct sock *sk, int val)
2202{
2203 if (val < 0)
2204 return -EINVAL;
2205
2206 sk->sk_peek_off = val;
2207 return 0;
2208}
2209EXPORT_SYMBOL_GPL(sk_set_peek_off);
3ab224be 2210
1da177e4
LT		 2211/*
2212 * Set of default routines for initialising struct proto_ops when
2213 * the protocol does not support a particular function. In certain
2214 * cases where it makes no sense for a protocol to have a "do nothing"
2215 * function, some default processing is provided.
2216 */
2217
2218int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2219{
2220 return -EOPNOTSUPP;
2221}
2a91525c 2222EXPORT_SYMBOL(sock_no_bind);
1da177e4 2223
4ec93edb 2224int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2225 int len, int flags)
2226{
2227 return -EOPNOTSUPP;
2228}
2a91525c 2229EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2230
2231int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2232{
2233 return -EOPNOTSUPP;
2234}
2a91525c 2235EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2236
2237int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2238{
2239 return -EOPNOTSUPP;
2240}
2a91525c 2241EXPORT_SYMBOL(sock_no_accept);
1da177e4 2242
4ec93edb 2243int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2244 int *len, int peer)
2245{
2246 return -EOPNOTSUPP;
2247}
2a91525c 2248EXPORT_SYMBOL(sock_no_getname);
1da177e4 2249
2a91525c 2250unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2251{
2252 return 0;
2253}
2a91525c 2254EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2255
2256int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2257{
2258 return -EOPNOTSUPP;
2259}
2a91525c 2260EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2261
2262int sock_no_listen(struct socket *sock, int backlog)
2263{
2264 return -EOPNOTSUPP;
2265}
2a91525c 2266EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2267
2268int sock_no_shutdown(struct socket *sock, int how)
2269{
2270 return -EOPNOTSUPP;
2271}
2a91525c 2272EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2273
2274int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2275 char __user *optval, unsigned int optlen)
1da177e4
LT		 2276{
2277 return -EOPNOTSUPP;
2278}
2a91525c 2279EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2280
2281int sock_no_getsockopt(struct socket *sock, int level, int optname,
2282 char __user *optval, int __user *optlen)
2283{
2284 return -EOPNOTSUPP;
2285}
2a91525c 2286EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4 2287
1b784140 2288int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
1da177e4
LT		 2289{
2290 return -EOPNOTSUPP;
2291}
2a91525c 2292EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4 2293
1b784140
YX		 2294int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2295 int flags)
1da177e4
LT		 2296{
2297 return -EOPNOTSUPP;
2298}
2a91525c 2299EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2300
2301int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2302{
2303 /* Mirror missing mmap method error code */
2304 return -ENODEV;
2305}
2a91525c 2306EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2307
2308ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2309{
2310 ssize_t res;
2311 struct msghdr msg = {.msg_flags = flags};
2312 struct kvec iov;
2313 char *kaddr = kmap(page);
2314 iov.iov_base = kaddr + offset;
2315 iov.iov_len = size;
2316 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2317 kunmap(page);
2318 return res;
2319}
2a91525c 2320EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2321
2322/*
2323 * Default Socket Callbacks
2324 */
2325
2326static void sock_def_wakeup(struct sock *sk)
2327{
43815482
ED		 2328 struct socket_wq *wq;
2329
2330 rcu_read_lock();
2331 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2332 if (skwq_has_sleeper(wq))
43815482
ED		 2333 wake_up_interruptible_all(&wq->wait);
2334 rcu_read_unlock();
1da177e4
LT		 2335}
2336
2337static void sock_def_error_report(struct sock *sk)
2338{
43815482
ED		 2339 struct socket_wq *wq;
2340
2341 rcu_read_lock();
2342 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2343 if (skwq_has_sleeper(wq))
43815482 2344 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2345 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2346 rcu_read_unlock();
1da177e4
LT		 2347}
2348
676d2369 2349static void sock_def_readable(struct sock *sk)
1da177e4 2350{
43815482
ED		 2351 struct socket_wq *wq;
2352
2353 rcu_read_lock();
2354 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2355 if (skwq_has_sleeper(wq))
2c6607c6 2356 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2357 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2358 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2359 rcu_read_unlock();
1da177e4
LT		 2360}
2361
2362static void sock_def_write_space(struct sock *sk)
2363{
43815482
ED		 2364 struct socket_wq *wq;
2365
2366 rcu_read_lock();
1da177e4
LT		 2367
2368 /* Do not wake up a writer until he can make "significant"
2369 * progress. --DaveM
2370 */
e71a4783 2371 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482 2372 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2373 if (skwq_has_sleeper(wq))
43815482 2374 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2375 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2376
2377 /* Should agree with poll, otherwise some programs break */
2378 if (sock_writeable(sk))
8d8ad9d7 2379 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2380 }
2381
43815482 2382 rcu_read_unlock();
1da177e4
LT		 2383}
2384
2385static void sock_def_destruct(struct sock *sk)
2386{
1da177e4
LT		 2387}
2388
2389void sk_send_sigurg(struct sock *sk)
2390{
2391 if (sk->sk_socket && sk->sk_socket->file)
2392 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2393 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2394}
2a91525c 2395EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2396
2397void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2398 unsigned long expires)
2399{
2400 if (!mod_timer(timer, expires))
2401 sock_hold(sk);
2402}
1da177e4
LT		 2403EXPORT_SYMBOL(sk_reset_timer);
2404
2405void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2406{
25cc4ae9 2407 if (del_timer(timer))
1da177e4
LT		 2408 __sock_put(sk);
2409}
1da177e4
LT		 2410EXPORT_SYMBOL(sk_stop_timer);
2411
2412void sock_init_data(struct socket *sock, struct sock *sk)
2413{
2414 skb_queue_head_init(&sk->sk_receive_queue);
2415 skb_queue_head_init(&sk->sk_write_queue);
2416 skb_queue_head_init(&sk->sk_error_queue);
2417
2418 sk->sk_send_head = NULL;
2419
2420 init_timer(&sk->sk_timer);
4ec93edb 2421
1da177e4
LT		 2422 sk->sk_allocation = GFP_KERNEL;
2423 sk->sk_rcvbuf = sysctl_rmem_default;
2424 sk->sk_sndbuf = sysctl_wmem_default;
2425 sk->sk_state = TCP_CLOSE;
972692e0 2426 sk_set_socket(sk, sock);
1da177e4
LT		 2427
2428 sock_set_flag(sk, SOCK_ZAPPED);
2429
e71a4783 2430 if (sock) {
1da177e4 2431 sk->sk_type = sock->type;
43815482 2432 sk->sk_wq = sock->wq;
1da177e4
LT		 2433 sock->sk = sk;
2434 } else
43815482 2435 sk->sk_wq = NULL;
1da177e4 2436
1da177e4 2437 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2438 lockdep_set_class_and_name(&sk->sk_callback_lock,
2439 af_callback_keys + sk->sk_family,
2440 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2441
2442 sk->sk_state_change = sock_def_wakeup;
2443 sk->sk_data_ready = sock_def_readable;
2444 sk->sk_write_space = sock_def_write_space;
2445 sk->sk_error_report = sock_def_error_report;
2446 sk->sk_destruct = sock_def_destruct;
2447
5640f768
ED		 2448 sk->sk_frag.page = NULL;
2449 sk->sk_frag.offset = 0;
ef64a54f 2450 sk->sk_peek_off = -1;
1da177e4 2451
109f6e39
EB		 2452 sk->sk_peer_pid = NULL;
2453 sk->sk_peer_cred = NULL;
1da177e4
LT		 2454 sk->sk_write_pending = 0;
2455 sk->sk_rcvlowat = 1;
2456 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2457 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2458
f37f0afb 2459 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2460
e0d1095a 2461#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2462 sk->sk_napi_id = 0;
64b0dc51 2463 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2464#endif
2465
62748f32 2466 sk->sk_max_pacing_rate = ~0U;
7eec4174 2467 sk->sk_pacing_rate = ~0U;
70da268b 2468 sk->sk_incoming_cpu = -1;
4dc6dc71
ED		 2469 /*
2470 * Before updating sk_refcnt, we must commit prior changes to memory
2471 * (Documentation/RCU/rculist_nulls.txt for details)
2472 */
2473 smp_wmb();
1da177e4 2474 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2475 atomic_set(&sk->sk_drops, 0);
1da177e4 2476}
2a91525c 2477EXPORT_SYMBOL(sock_init_data);
1da177e4 2478
b5606c2d 2479void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2480{
2481 might_sleep();
a5b5bb9a 2482 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2483 if (sk->sk_lock.owned)
1da177e4 2484 __lock_sock(sk);
d2e9117c 2485 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2486 spin_unlock(&sk->sk_lock.slock);
2487 /*
2488 * The sk_lock has mutex_lock() semantics here:
2489 */
fcc70d5f 2490 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2491 local_bh_enable();
1da177e4 2492}
fcc70d5f 2493EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2494
b5606c2d 2495void release_sock(struct sock *sk)
1da177e4 2496{
a5b5bb9a 2497 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2498 if (sk->sk_backlog.tail)
2499 __release_sock(sk);
46d3ceab 2500
c3f9b018
ED		 2501 /* Warning : release_cb() might need to release sk ownership,
2502 * ie call sock_release_ownership(sk) before us.
2503 */
46d3ceab
ED		 2504 if (sk->sk_prot->release_cb)
2505 sk->sk_prot->release_cb(sk);
2506
c3f9b018 2507 sock_release_ownership(sk);
a5b5bb9a
IM		 2508 if (waitqueue_active(&sk->sk_lock.wq))
2509 wake_up(&sk->sk_lock.wq);
2510 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2511}
2512EXPORT_SYMBOL(release_sock);
2513
8a74ad60
ED		 2514/**
2515 * lock_sock_fast - fast version of lock_sock
2516 * @sk: socket
2517 *
2518 * This version should be used for very small section, where process wont block
2519 * return false if fast path is taken
2520 * sk_lock.slock locked, owned = 0, BH disabled
2521 * return true if slow path is taken
2522 * sk_lock.slock unlocked, owned = 1, BH enabled
2523 */
2524bool lock_sock_fast(struct sock *sk)
2525{
2526 might_sleep();
2527 spin_lock_bh(&sk->sk_lock.slock);
2528
2529 if (!sk->sk_lock.owned)
2530 /*
2531 * Note : We must disable BH
2532 */
2533 return false;
2534
2535 __lock_sock(sk);
2536 sk->sk_lock.owned = 1;
2537 spin_unlock(&sk->sk_lock.slock);
2538 /*
2539 * The sk_lock has mutex_lock() semantics here:
2540 */
2541 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2542 local_bh_enable();
2543 return true;
2544}
2545EXPORT_SYMBOL(lock_sock_fast);
2546
1da177e4 2547int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2548{
b7aa0bf7 2549 struct timeval tv;
1da177e4 2550 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2551 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2552 tv = ktime_to_timeval(sk->sk_stamp);
2553 if (tv.tv_sec == -1)
1da177e4 2554 return -ENOENT;
b7aa0bf7
ED		 2555 if (tv.tv_sec == 0) {
2556 sk->sk_stamp = ktime_get_real();
2557 tv = ktime_to_timeval(sk->sk_stamp);
2558 }
2559 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2560}
1da177e4
LT		 2561EXPORT_SYMBOL(sock_get_timestamp);
2562
ae40eb1e
ED		 2563int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2564{
2565 struct timespec ts;
2566 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2567 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2568 ts = ktime_to_timespec(sk->sk_stamp);
2569 if (ts.tv_sec == -1)
2570 return -ENOENT;
2571 if (ts.tv_sec == 0) {
2572 sk->sk_stamp = ktime_get_real();
2573 ts = ktime_to_timespec(sk->sk_stamp);
2574 }
2575 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2576}
2577EXPORT_SYMBOL(sock_get_timestampns);
2578
20d49473 2579void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2580{
20d49473 2581 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2582 unsigned long previous_flags = sk->sk_flags;
2583
20d49473
PO		 2584 sock_set_flag(sk, flag);
2585 /*
2586 * we just set one of the two flags which require net
2587 * time stamping, but time stamping might have been on
2588 * already because of the other one
2589 */
080a270f
HFS		 2590 if (sock_needs_netstamp(sk) &&
2591 !(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2592 net_enable_timestamp();
1da177e4
LT		 2593 }
2594}
1da177e4 2595
cb820f8e
RC		 2596int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2597 int level, int type)
2598{
2599 struct sock_exterr_skb *serr;
364a9e93 2600 struct sk_buff *skb;
cb820f8e
RC		 2601 int copied, err;
2602
2603 err = -EAGAIN;
364a9e93 2604 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 2605 if (skb == NULL)
2606 goto out;
2607
2608 copied = skb->len;
2609 if (copied > len) {
2610 msg->msg_flags |= MSG_TRUNC;
2611 copied = len;
2612 }
51f3d02b 2613 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 2614 if (err)
2615 goto out_free_skb;
2616
2617 sock_recv_timestamp(msg, sk, skb);
2618
2619 serr = SKB_EXT_ERR(skb);
2620 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2621
2622 msg->msg_flags |= MSG_ERRQUEUE;
2623 err = copied;
2624
cb820f8e
RC		 2625out_free_skb:
2626 kfree_skb(skb);
2627out:
2628 return err;
2629}
2630EXPORT_SYMBOL(sock_recv_errqueue);
2631
1da177e4
LT		 2632/*
2633 * Get a socket option on an socket.
2634 *
2635 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2636 * asynchronous errors should be reported by getsockopt. We assume
2637 * this means if you specify SO_ERROR (otherwise whats the point of it).
2638 */
2639int sock_common_getsockopt(struct socket *sock, int level, int optname,
2640 char __user *optval, int __user *optlen)
2641{
2642 struct sock *sk = sock->sk;
2643
2644 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2645}
1da177e4
LT		 2646EXPORT_SYMBOL(sock_common_getsockopt);
2647
3fdadf7d 2648#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2649int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2650 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2651{
2652 struct sock *sk = sock->sk;
2653
1e51f951 2654 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2655 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2656 optval, optlen);
3fdadf7d
DM		 2657 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2658}
2659EXPORT_SYMBOL(compat_sock_common_getsockopt);
2660#endif
2661
1b784140
YX		 2662int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2663 int flags)
1da177e4
LT		 2664{
2665 struct sock *sk = sock->sk;
2666 int addr_len = 0;
2667 int err;
2668
1b784140 2669 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
1da177e4
LT		 2670 flags & ~MSG_DONTWAIT, &addr_len);
2671 if (err >= 0)
2672 msg->msg_namelen = addr_len;
2673 return err;
2674}
1da177e4
LT		 2675EXPORT_SYMBOL(sock_common_recvmsg);
2676
2677/*
2678 * Set socket options on an inet socket.
2679 */
2680int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2681 char __user *optval, unsigned int optlen)
1da177e4
LT		 2682{
2683 struct sock *sk = sock->sk;
2684
2685 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2686}
1da177e4
LT		 2687EXPORT_SYMBOL(sock_common_setsockopt);
2688
3fdadf7d 2689#ifdef CONFIG_COMPAT
543d9cfe 2690int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2691 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2692{
2693 struct sock *sk = sock->sk;
2694
543d9cfe
ACM		 2695 if (sk->sk_prot->compat_setsockopt != NULL)
2696 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2697 optval, optlen);
3fdadf7d
DM		 2698 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2699}
2700EXPORT_SYMBOL(compat_sock_common_setsockopt);
2701#endif
2702
1da177e4
LT		 2703void sk_common_release(struct sock *sk)
2704{
2705 if (sk->sk_prot->destroy)
2706 sk->sk_prot->destroy(sk);
2707
2708 /*
2709 * Observation: when sock_common_release is called, processes have
2710 * no access to socket. But net still has.
2711 * Step one, detach it from networking:
2712 *
2713 * A. Remove from hash tables.
2714 */
2715
2716 sk->sk_prot->unhash(sk);
2717
2718 /*
2719 * In this point socket cannot receive new packets, but it is possible
2720 * that some packets are in flight because some CPU runs receiver and
2721 * did hash table lookup before we unhashed socket. They will achieve
2722 * receive queue and will be purged by socket destructor.
2723 *
2724 * Also we still have packets pending on receive queue and probably,
2725 * our own packets waiting in device queues. sock_destroy will drain
2726 * receive queue, but transmitted packets will delay socket destruction
2727 * until the last reference will be released.
2728 */
2729
2730 sock_orphan(sk);
2731
2732 xfrm_sk_free_policy(sk);
2733
e6848976 2734 sk_refcnt_debug_release(sk);
5640f768
ED		 2735
2736 if (sk->sk_frag.page) {
2737 put_page(sk->sk_frag.page);
2738 sk->sk_frag.page = NULL;
2739 }
2740
1da177e4
LT		 2741 sock_put(sk);
2742}
1da177e4
LT		 2743EXPORT_SYMBOL(sk_common_release);
2744
13ff3d6f
PE		 2745#ifdef CONFIG_PROC_FS
2746#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2747struct prot_inuse {
2748 int val[PROTO_INUSE_NR];
2749};
13ff3d6f
PE		 2750
2751static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2752
2753#ifdef CONFIG_NET_NS
2754void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2755{
d6d9ca0f 2756 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2757}
2758EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2759
2760int sock_prot_inuse_get(struct net *net, struct proto *prot)
2761{
2762 int cpu, idx = prot->inuse_idx;
2763 int res = 0;
2764
2765 for_each_possible_cpu(cpu)
2766 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2767
2768 return res >= 0 ? res : 0;
2769}
2770EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2771
2c8c1e72 2772static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2773{
2774 net->core.inuse = alloc_percpu(struct prot_inuse);
2775 return net->core.inuse ? 0 : -ENOMEM;
2776}
2777
2c8c1e72 2778static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2779{
2780 free_percpu(net->core.inuse);
2781}
2782
2783static struct pernet_operations net_inuse_ops = {
2784 .init = sock_inuse_init_net,
2785 .exit = sock_inuse_exit_net,
2786};
2787
2788static __init int net_inuse_init(void)
2789{
2790 if (register_pernet_subsys(&net_inuse_ops))
2791 panic("Cannot initialize net inuse counters");
2792
2793 return 0;
2794}
2795
2796core_initcall(net_inuse_init);
2797#else
1338d466
PE		 2798static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2799
c29a0bc4 2800void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2801{
d6d9ca0f 2802 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2803}
2804EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2805
c29a0bc4 2806int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2807{
2808 int cpu, idx = prot->inuse_idx;
2809 int res = 0;
2810
2811 for_each_possible_cpu(cpu)
2812 res += per_cpu(prot_inuse, cpu).val[idx];
2813
2814 return res >= 0 ? res : 0;
2815}
2816EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2817#endif
13ff3d6f
PE		 2818
2819static void assign_proto_idx(struct proto *prot)
2820{
2821 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2822
2823 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2824 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2825 return;
2826 }
2827
2828 set_bit(prot->inuse_idx, proto_inuse_idx);
2829}
2830
2831static void release_proto_idx(struct proto *prot)
2832{
2833 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2834 clear_bit(prot->inuse_idx, proto_inuse_idx);
2835}
2836#else
2837static inline void assign_proto_idx(struct proto *prot)
2838{
2839}
2840
2841static inline void release_proto_idx(struct proto *prot)
2842{
2843}
2844#endif
2845
0159dfd3
ED		 2846static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
2847{
2848 if (!rsk_prot)
2849 return;
2850 kfree(rsk_prot->slab_name);
2851 rsk_prot->slab_name = NULL;
adf78eda
JL		 2852 kmem_cache_destroy(rsk_prot->slab);
2853 rsk_prot->slab = NULL;
0159dfd3
ED		 2854}
2855
2856static int req_prot_init(const struct proto *prot)
2857{
2858 struct request_sock_ops *rsk_prot = prot->rsk_prot;
2859
2860 if (!rsk_prot)
2861 return 0;
2862
2863 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
2864 prot->name);
2865 if (!rsk_prot->slab_name)
2866 return -ENOMEM;
2867
2868 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
2869 rsk_prot->obj_size, 0,
e96f78ab 2870 prot->slab_flags, NULL);
0159dfd3
ED		 2871
2872 if (!rsk_prot->slab) {
2873 pr_crit("%s: Can't create request sock SLAB cache!\n",
2874 prot->name);
2875 return -ENOMEM;
2876 }
2877 return 0;
2878}
2879
b733c007
PE		 2880int proto_register(struct proto *prot, int alloc_slab)
2881{
1da177e4
LT		 2882 if (alloc_slab) {
2883 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2884 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2885 NULL);
1da177e4
LT		 2886
2887 if (prot->slab == NULL) {
e005d193
JP		 2888 pr_crit("%s: Can't create sock SLAB cache!\n",
2889 prot->name);
60e7663d 2890 goto out;
1da177e4 2891 }
2e6599cb 2892
0159dfd3
ED		 2893 if (req_prot_init(prot))
2894 goto out_free_request_sock_slab;
8feaf0c0 2895
6d6ee43e 2896 if (prot->twsk_prot != NULL) {
faf23422 2897 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2898
7e56b5d6 2899 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2900 goto out_free_request_sock_slab;
2901
6d6ee43e 2902 prot->twsk_prot->twsk_slab =
7e56b5d6 2903 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2904 prot->twsk_prot->twsk_obj_size,
3ab5aee7 2905 0,
52db70dc 2906 prot->slab_flags,
20c2df83 2907 NULL);
6d6ee43e 2908 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2909 goto out_free_timewait_sock_slab_name;
2910 }
1da177e4
LT		 2911 }
2912
36b77a52 2913 mutex_lock(&proto_list_mutex);
1da177e4 2914 list_add(&prot->node, &proto_list);
13ff3d6f 2915 assign_proto_idx(prot);
36b77a52 2916 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2917 return 0;
2918
8feaf0c0 2919out_free_timewait_sock_slab_name:
7e56b5d6 2920 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0 2921out_free_request_sock_slab:
0159dfd3
ED		 2922 req_prot_cleanup(prot->rsk_prot);
2923
2e6599cb
ACM		 2924 kmem_cache_destroy(prot->slab);
2925 prot->slab = NULL;
b733c007
PE		 2926out:
2927 return -ENOBUFS;
1da177e4 2928}
1da177e4
LT		 2929EXPORT_SYMBOL(proto_register);
2930
2931void proto_unregister(struct proto *prot)
2932{
36b77a52 2933 mutex_lock(&proto_list_mutex);
13ff3d6f 2934 release_proto_idx(prot);
0a3f4358 2935 list_del(&prot->node);
36b77a52 2936 mutex_unlock(&proto_list_mutex);
1da177e4 2937
adf78eda
JL		 2938 kmem_cache_destroy(prot->slab);
2939 prot->slab = NULL;
1da177e4 2940
0159dfd3 2941 req_prot_cleanup(prot->rsk_prot);
2e6599cb 2942
6d6ee43e 2943 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2944 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2945 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2946 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2947 }
1da177e4 2948}
1da177e4
LT		 2949EXPORT_SYMBOL(proto_unregister);
2950
2951#ifdef CONFIG_PROC_FS
1da177e4 2952static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2953 __acquires(proto_list_mutex)
1da177e4 2954{
36b77a52 2955 mutex_lock(&proto_list_mutex);
60f0438a 2956 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2957}
2958
2959static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2960{
60f0438a 2961 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2962}
2963
2964static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2965 __releases(proto_list_mutex)
1da177e4 2966{
36b77a52 2967 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2968}
2969
2970static char proto_method_implemented(const void *method)
2971{
2972 return method == NULL ? 'n' : 'y';
2973}
180d8cd9
GC		 2974static long sock_prot_memory_allocated(struct proto *proto)
2975{
cb75a36c 2976 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2977}
2978
2979static char *sock_prot_memory_pressure(struct proto *proto)
2980{
2981 return proto->memory_pressure != NULL ?
2982 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2983}
1da177e4
LT		 2984
2985static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2986{
180d8cd9 2987
8d987e5c 2988 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2989 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2990 proto->name,
2991 proto->obj_size,
14e943db 2992 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2993 sock_prot_memory_allocated(proto),
2994 sock_prot_memory_pressure(proto),
1da177e4
LT		 2995 proto->max_header,
2996 proto->slab == NULL ? "no" : "yes",
2997 module_name(proto->owner),
2998 proto_method_implemented(proto->close),
2999 proto_method_implemented(proto->connect),
3000 proto_method_implemented(proto->disconnect),
3001 proto_method_implemented(proto->accept),
3002 proto_method_implemented(proto->ioctl),
3003 proto_method_implemented(proto->init),
3004 proto_method_implemented(proto->destroy),
3005 proto_method_implemented(proto->shutdown),
3006 proto_method_implemented(proto->setsockopt),
3007 proto_method_implemented(proto->getsockopt),
3008 proto_method_implemented(proto->sendmsg),
3009 proto_method_implemented(proto->recvmsg),
3010 proto_method_implemented(proto->sendpage),
3011 proto_method_implemented(proto->bind),
3012 proto_method_implemented(proto->backlog_rcv),
3013 proto_method_implemented(proto->hash),
3014 proto_method_implemented(proto->unhash),
3015 proto_method_implemented(proto->get_port),
3016 proto_method_implemented(proto->enter_memory_pressure));
3017}
3018
3019static int proto_seq_show(struct seq_file *seq, void *v)
3020{
60f0438a 3021 if (v == &proto_list)
1da177e4
LT		 3022 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3023 "protocol",
3024 "size",
3025 "sockets",
3026 "memory",
3027 "press",
3028 "maxhdr",
3029 "slab",
3030 "module",
3031 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3032 else
60f0438a 3033 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 3034 return 0;
3035}
3036
f690808e 3037static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 3038 .start = proto_seq_start,
3039 .next = proto_seq_next,
3040 .stop = proto_seq_stop,
3041 .show = proto_seq_show,
3042};
3043
3044static int proto_seq_open(struct inode *inode, struct file *file)
3045{
14e943db
ED		 3046 return seq_open_net(inode, file, &proto_seq_ops,
3047 sizeof(struct seq_net_private));
1da177e4
LT		 3048}
3049
9a32144e 3050static const struct file_operations proto_seq_fops = {
1da177e4
LT		 3051 .owner = THIS_MODULE,
3052 .open = proto_seq_open,
3053 .read = seq_read,
3054 .llseek = seq_lseek,
14e943db
ED		 3055 .release = seq_release_net,
3056};
3057
3058static __net_init int proto_init_net(struct net *net)
3059{
d4beaa66 3060 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 3061 return -ENOMEM;
3062
3063 return 0;
3064}
3065
3066static __net_exit void proto_exit_net(struct net *net)
3067{
ece31ffd 3068 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 3069}
3070
3071
3072static __net_initdata struct pernet_operations proto_net_ops = {
3073 .init = proto_init_net,
3074 .exit = proto_exit_net,
1da177e4
LT		 3075};
3076
3077static int __init proto_init(void)
3078{
14e943db 3079 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 3080}
3081
3082subsys_initcall(proto_init);
3083
3084#endif /* PROC_FS */
Linux kernel - Deliverables
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