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Merge tag 'for-linus-20151217' of git://git.infradead.org/linux-mtd
[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>
137
3847ce32
SM		 138#include <trace/events/sock.h>
139
1da177e4
LT		 140#ifdef CONFIG_INET
141#include <net/tcp.h>
142#endif
143
076bb0c8 144#include <net/busy_poll.h>
06021292 145
36b77a52 146static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 147static LIST_HEAD(proto_list);
148
a3b299da
EB		 149/**
150 * sk_ns_capable - General socket capability test
151 * @sk: Socket to use a capability on or through
152 * @user_ns: The user namespace of the capability to use
153 * @cap: The capability to use
154 *
155 * Test to see if the opener of the socket had when the socket was
156 * created and the current process has the capability @cap in the user
157 * namespace @user_ns.
158 */
159bool sk_ns_capable(const struct sock *sk,
160 struct user_namespace *user_ns, int cap)
161{
162 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
163 ns_capable(user_ns, cap);
164}
165EXPORT_SYMBOL(sk_ns_capable);
166
167/**
168 * sk_capable - Socket global capability test
169 * @sk: Socket to use a capability on or through
e793c0f7 170 * @cap: The global capability to use
a3b299da
EB		 171 *
172 * Test to see if the opener of the socket had when the socket was
173 * created and the current process has the capability @cap in all user
174 * namespaces.
175 */
176bool sk_capable(const struct sock *sk, int cap)
177{
178 return sk_ns_capable(sk, &init_user_ns, cap);
179}
180EXPORT_SYMBOL(sk_capable);
181
182/**
183 * sk_net_capable - Network namespace socket capability test
184 * @sk: Socket to use a capability on or through
185 * @cap: The capability to use
186 *
e793c0f7 187 * Test to see if the opener of the socket had when the socket was created
a3b299da
EB		 188 * and the current process has the capability @cap over the network namespace
189 * the socket is a member of.
190 */
191bool sk_net_capable(const struct sock *sk, int cap)
192{
193 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
194}
195EXPORT_SYMBOL(sk_net_capable);
196
197
c255a458 198#ifdef CONFIG_MEMCG_KMEM
1d62e436 199int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
d1a4c0b3
GC		 200{
201 struct proto *proto;
202 int ret = 0;
203
36b77a52 204 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 205 list_for_each_entry(proto, &proto_list, node) {
206 if (proto->init_cgroup) {
1d62e436 207 ret = proto->init_cgroup(memcg, ss);
d1a4c0b3
GC		 208 if (ret)
209 goto out;
210 }
211 }
212
36b77a52 213 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 214 return ret;
215out:
216 list_for_each_entry_continue_reverse(proto, &proto_list, node)
217 if (proto->destroy_cgroup)
1d62e436 218 proto->destroy_cgroup(memcg);
36b77a52 219 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 220 return ret;
221}
222
1d62e436 223void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
d1a4c0b3
GC		 224{
225 struct proto *proto;
226
36b77a52 227 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 228 list_for_each_entry_reverse(proto, &proto_list, node)
229 if (proto->destroy_cgroup)
1d62e436 230 proto->destroy_cgroup(memcg);
36b77a52 231 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 232}
233#endif
234
da21f24d
IM		 235/*
236 * Each address family might have different locking rules, so we have
237 * one slock key per address family:
238 */
a5b5bb9a
IM		 239static struct lock_class_key af_family_keys[AF_MAX];
240static struct lock_class_key af_family_slock_keys[AF_MAX];
241
cbda4eaf 242#if defined(CONFIG_MEMCG_KMEM)
c5905afb 243struct static_key memcg_socket_limit_enabled;
e1aab161 244EXPORT_SYMBOL(memcg_socket_limit_enabled);
cbda4eaf 245#endif
e1aab161 246
a5b5bb9a
IM		 247/*
248 * Make lock validator output more readable. (we pre-construct these
249 * strings build-time, so that runtime initialization of socket
250 * locks is fast):
251 */
36cbd3dc 252static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 253 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
254 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
255 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
256 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
257 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
258 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
259 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 260 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 261 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 262 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 263 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 264 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 265 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
456db6a4 266 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX"
a5b5bb9a 267};
36cbd3dc 268static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 269 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
270 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
271 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
272 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
273 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
274 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
275 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 276 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 277 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 278 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 279 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 280 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 281 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
456db6a4 282 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX"
a5b5bb9a 283};
36cbd3dc 284static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 285 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
286 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
287 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
288 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
289 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
290 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
291 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 292 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 293 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 294 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 295 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 296 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 297 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
456db6a4 298 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX"
443aef0e 299};
da21f24d
IM		 300
301/*
302 * sk_callback_lock locking rules are per-address-family,
303 * so split the lock classes by using a per-AF key:
304 */
305static struct lock_class_key af_callback_keys[AF_MAX];
306
1da177e4
LT		 307/* Take into consideration the size of the struct sk_buff overhead in the
308 * determination of these values, since that is non-constant across
309 * platforms. This makes socket queueing behavior and performance
310 * not depend upon such differences.
311 */
312#define _SK_MEM_PACKETS 256
87fb4b7b 313#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 314#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
315#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
316
317/* Run time adjustable parameters. */
ab32ea5d 318__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 319EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 320__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 321EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 322__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
323__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 324
25985edc 325/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 326int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 327EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 328
b245be1f
WB		 329int sysctl_tstamp_allow_data __read_mostly = 1;
330
c93bdd0e
MG		 331struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
332EXPORT_SYMBOL_GPL(memalloc_socks);
333
7cb02404
MG		 334/**
335 * sk_set_memalloc - sets %SOCK_MEMALLOC
336 * @sk: socket to set it on
337 *
338 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
339 * It's the responsibility of the admin to adjust min_free_kbytes
340 * to meet the requirements
341 */
342void sk_set_memalloc(struct sock *sk)
343{
344 sock_set_flag(sk, SOCK_MEMALLOC);
345 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 346 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 347}
348EXPORT_SYMBOL_GPL(sk_set_memalloc);
349
350void sk_clear_memalloc(struct sock *sk)
351{
352 sock_reset_flag(sk, SOCK_MEMALLOC);
353 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 354 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 355
356 /*
357 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
5d753610
MG		 358 * progress of swapping. SOCK_MEMALLOC may be cleared while
359 * it has rmem allocations due to the last swapfile being deactivated
360 * but there is a risk that the socket is unusable due to exceeding
361 * the rmem limits. Reclaim the reserves and obey rmem limits again.
c76562b6 362 */
5d753610 363 sk_mem_reclaim(sk);
7cb02404
MG		 364}
365EXPORT_SYMBOL_GPL(sk_clear_memalloc);
366
b4b9e355
MG		 367int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
368{
369 int ret;
370 unsigned long pflags = current->flags;
371
372 /* these should have been dropped before queueing */
373 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
374
375 current->flags |= PF_MEMALLOC;
376 ret = sk->sk_backlog_rcv(sk, skb);
377 tsk_restore_flags(current, pflags, PF_MEMALLOC);
378
379 return ret;
380}
381EXPORT_SYMBOL(__sk_backlog_rcv);
382
1da177e4
LT		 383static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
384{
385 struct timeval tv;
386
387 if (optlen < sizeof(tv))
388 return -EINVAL;
389 if (copy_from_user(&tv, optval, sizeof(tv)))
390 return -EFAULT;
ba78073e
VA		 391 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
392 return -EDOM;
1da177e4 393
ba78073e 394 if (tv.tv_sec < 0) {
6f11df83
AM		 395 static int warned __read_mostly;
396
ba78073e 397 *timeo_p = 0;
50aab54f 398 if (warned < 10 && net_ratelimit()) {
ba78073e 399 warned++;
e005d193
JP		 400 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
401 __func__, current->comm, task_pid_nr(current));
50aab54f 402 }
ba78073e
VA		 403 return 0;
404 }
1da177e4
LT		 405 *timeo_p = MAX_SCHEDULE_TIMEOUT;
406 if (tv.tv_sec == 0 && tv.tv_usec == 0)
407 return 0;
408 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
409 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
410 return 0;
411}
412
413static void sock_warn_obsolete_bsdism(const char *name)
414{
415 static int warned;
416 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 417 if (strcmp(warncomm, current->comm) && warned < 5) {
418 strcpy(warncomm, current->comm);
e005d193
JP		 419 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
420 warncomm, name);
1da177e4
LT		 421 warned++;
422 }
423}
424
080a270f
HFS		 425static bool sock_needs_netstamp(const struct sock *sk)
426{
427 switch (sk->sk_family) {
428 case AF_UNSPEC:
429 case AF_UNIX:
430 return false;
431 default:
432 return true;
433 }
434}
435
08e29af3 436static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 437{
08e29af3
ED		 438 if (sk->sk_flags & flags) {
439 sk->sk_flags &= ~flags;
080a270f
HFS		 440 if (sock_needs_netstamp(sk) &&
441 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 442 net_disable_timestamp();
1da177e4
LT		 443 }
444}
445
446
f0088a50
DV		 447int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
448{
766e9037 449 int err;
3b885787
NH		 450 unsigned long flags;
451 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 452
0fd7bac6 453 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 454 atomic_inc(&sk->sk_drops);
3847ce32 455 trace_sock_rcvqueue_full(sk, skb);
766e9037 456 return -ENOMEM;
f0088a50
DV		 457 }
458
fda9ef5d 459 err = sk_filter(sk, skb);
f0088a50 460 if (err)
766e9037 461 return err;
f0088a50 462
c76562b6 463 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 464 atomic_inc(&sk->sk_drops);
465 return -ENOBUFS;
3ab224be
HA		 466 }
467
f0088a50
DV		 468 skb->dev = NULL;
469 skb_set_owner_r(skb, sk);
49ad9599 470
7fee226a
ED		 471 /* we escape from rcu protected region, make sure we dont leak
472 * a norefcounted dst
473 */
474 skb_dst_force(skb);
475
3b885787 476 spin_lock_irqsave(&list->lock, flags);
3bc3b96f 477 sock_skb_set_dropcount(sk, skb);
3b885787
NH		 478 __skb_queue_tail(list, skb);
479 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 480
481 if (!sock_flag(sk, SOCK_DEAD))
676d2369 482 sk->sk_data_ready(sk);
766e9037 483 return 0;
f0088a50
DV		 484}
485EXPORT_SYMBOL(sock_queue_rcv_skb);
486
58a5a7b9 487int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 488{
489 int rc = NET_RX_SUCCESS;
490
fda9ef5d 491 if (sk_filter(sk, skb))
f0088a50
DV		 492 goto discard_and_relse;
493
494 skb->dev = NULL;
495
274f482d 496 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 497 atomic_inc(&sk->sk_drops);
498 goto discard_and_relse;
499 }
58a5a7b9
ACM		 500 if (nested)
501 bh_lock_sock_nested(sk);
502 else
503 bh_lock_sock(sk);
a5b5bb9a
IM		 504 if (!sock_owned_by_user(sk)) {
505 /*
506 * trylock + unlock semantics:
507 */
508 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
509
c57943a1 510 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 511
512 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 513 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 514 bh_unlock_sock(sk);
515 atomic_inc(&sk->sk_drops);
516 goto discard_and_relse;
517 }
518
f0088a50
DV		 519 bh_unlock_sock(sk);
520out:
521 sock_put(sk);
522 return rc;
523discard_and_relse:
524 kfree_skb(skb);
525 goto out;
526}
527EXPORT_SYMBOL(sk_receive_skb);
528
529struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
530{
b6c6712a 531 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 532
533 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 534 sk_tx_queue_clear(sk);
a9b3cd7f 535 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 536 dst_release(dst);
537 return NULL;
538 }
539
540 return dst;
541}
542EXPORT_SYMBOL(__sk_dst_check);
543
544struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
545{
546 struct dst_entry *dst = sk_dst_get(sk);
547
548 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
549 sk_dst_reset(sk);
550 dst_release(dst);
551 return NULL;
552 }
553
554 return dst;
555}
556EXPORT_SYMBOL(sk_dst_check);
557
c91f6df2
BH		 558static int sock_setbindtodevice(struct sock *sk, char __user *optval,
559 int optlen)
4878809f
DM		 560{
561 int ret = -ENOPROTOOPT;
562#ifdef CONFIG_NETDEVICES
3b1e0a65 563 struct net *net = sock_net(sk);
4878809f
DM		 564 char devname[IFNAMSIZ];
565 int index;
566
567 /* Sorry... */
568 ret = -EPERM;
5e1fccc0 569 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 570 goto out;
571
572 ret = -EINVAL;
573 if (optlen < 0)
574 goto out;
575
576 /* Bind this socket to a particular device like "eth0",
577 * as specified in the passed interface name. If the
578 * name is "" or the option length is zero the socket
579 * is not bound.
580 */
581 if (optlen > IFNAMSIZ - 1)
582 optlen = IFNAMSIZ - 1;
583 memset(devname, 0, sizeof(devname));
584
585 ret = -EFAULT;
586 if (copy_from_user(devname, optval, optlen))
587 goto out;
588
000ba2e4
DM		 589 index = 0;
590 if (devname[0] != '\0') {
bf8e56bf 591 struct net_device *dev;
4878809f 592
bf8e56bf
ED		 593 rcu_read_lock();
594 dev = dev_get_by_name_rcu(net, devname);
595 if (dev)
596 index = dev->ifindex;
597 rcu_read_unlock();
4878809f
DM		 598 ret = -ENODEV;
599 if (!dev)
600 goto out;
4878809f
DM		 601 }
602
603 lock_sock(sk);
604 sk->sk_bound_dev_if = index;
605 sk_dst_reset(sk);
606 release_sock(sk);
607
608 ret = 0;
609
610out:
611#endif
612
613 return ret;
614}
615
c91f6df2
BH		 616static int sock_getbindtodevice(struct sock *sk, char __user *optval,
617 int __user *optlen, int len)
618{
619 int ret = -ENOPROTOOPT;
620#ifdef CONFIG_NETDEVICES
621 struct net *net = sock_net(sk);
c91f6df2 622 char devname[IFNAMSIZ];
c91f6df2
BH		 623
624 if (sk->sk_bound_dev_if == 0) {
625 len = 0;
626 goto zero;
627 }
628
629 ret = -EINVAL;
630 if (len < IFNAMSIZ)
631 goto out;
632
5dbe7c17
NS		 633 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
634 if (ret)
c91f6df2 635 goto out;
c91f6df2
BH		 636
637 len = strlen(devname) + 1;
638
639 ret = -EFAULT;
640 if (copy_to_user(optval, devname, len))
641 goto out;
642
643zero:
644 ret = -EFAULT;
645 if (put_user(len, optlen))
646 goto out;
647
648 ret = 0;
649
650out:
651#endif
652
653 return ret;
654}
655
c0ef877b
PE		 656static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
657{
658 if (valbool)
659 sock_set_flag(sk, bit);
660 else
661 sock_reset_flag(sk, bit);
662}
663
f60e5990 664bool sk_mc_loop(struct sock *sk)
665{
666 if (dev_recursion_level())
667 return false;
668 if (!sk)
669 return true;
670 switch (sk->sk_family) {
671 case AF_INET:
672 return inet_sk(sk)->mc_loop;
673#if IS_ENABLED(CONFIG_IPV6)
674 case AF_INET6:
675 return inet6_sk(sk)->mc_loop;
676#endif
677 }
678 WARN_ON(1);
679 return true;
680}
681EXPORT_SYMBOL(sk_mc_loop);
682
1da177e4
LT		 683/*
684 * This is meant for all protocols to use and covers goings on
685 * at the socket level. Everything here is generic.
686 */
687
688int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 689 char __user *optval, unsigned int optlen)
1da177e4 690{
2a91525c 691 struct sock *sk = sock->sk;
1da177e4
LT		 692 int val;
693 int valbool;
694 struct linger ling;
695 int ret = 0;
4ec93edb 696
1da177e4
LT		 697 /*
698 * Options without arguments
699 */
700
4878809f 701 if (optname == SO_BINDTODEVICE)
c91f6df2 702 return sock_setbindtodevice(sk, optval, optlen);
4878809f 703
e71a4783
SH		 704 if (optlen < sizeof(int))
705 return -EINVAL;
4ec93edb 706
1da177e4
LT		 707 if (get_user(val, (int __user *)optval))
708 return -EFAULT;
4ec93edb 709
2a91525c 710 valbool = val ? 1 : 0;
1da177e4
LT		 711
712 lock_sock(sk);
713
2a91525c 714 switch (optname) {
e71a4783 715 case SO_DEBUG:
2a91525c 716 if (val && !capable(CAP_NET_ADMIN))
e71a4783 717 ret = -EACCES;
2a91525c 718 else
c0ef877b 719 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 720 break;
721 case SO_REUSEADDR:
4a17fd52 722 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 723 break;
055dc21a
TH		 724 case SO_REUSEPORT:
725 sk->sk_reuseport = valbool;
726 break;
e71a4783 727 case SO_TYPE:
49c794e9 728 case SO_PROTOCOL:
0d6038ee 729 case SO_DOMAIN:
e71a4783
SH		 730 case SO_ERROR:
731 ret = -ENOPROTOOPT;
732 break;
733 case SO_DONTROUTE:
c0ef877b 734 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 735 break;
736 case SO_BROADCAST:
737 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
738 break;
739 case SO_SNDBUF:
740 /* Don't error on this BSD doesn't and if you think
82981930
ED		 741 * about it this is right. Otherwise apps have to
742 * play 'guess the biggest size' games. RCVBUF/SNDBUF
743 * are treated in BSD as hints
744 */
745 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 746set_sndbuf:
e71a4783 747 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 748 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
749 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 750 sk->sk_write_space(sk);
751 break;
1da177e4 752
e71a4783
SH		 753 case SO_SNDBUFFORCE:
754 if (!capable(CAP_NET_ADMIN)) {
755 ret = -EPERM;
756 break;
757 }
758 goto set_sndbuf;
b0573dea 759
e71a4783
SH		 760 case SO_RCVBUF:
761 /* Don't error on this BSD doesn't and if you think
82981930
ED		 762 * about it this is right. Otherwise apps have to
763 * play 'guess the biggest size' games. RCVBUF/SNDBUF
764 * are treated in BSD as hints
765 */
766 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 767set_rcvbuf:
e71a4783
SH		 768 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
769 /*
770 * We double it on the way in to account for
771 * "struct sk_buff" etc. overhead. Applications
772 * assume that the SO_RCVBUF setting they make will
773 * allow that much actual data to be received on that
774 * socket.
775 *
776 * Applications are unaware that "struct sk_buff" and
777 * other overheads allocate from the receive buffer
778 * during socket buffer allocation.
779 *
780 * And after considering the possible alternatives,
781 * returning the value we actually used in getsockopt
782 * is the most desirable behavior.
783 */
82981930 784 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 785 break;
786
787 case SO_RCVBUFFORCE:
788 if (!capable(CAP_NET_ADMIN)) {
789 ret = -EPERM;
1da177e4 790 break;
e71a4783
SH		 791 }
792 goto set_rcvbuf;
1da177e4 793
e71a4783 794 case SO_KEEPALIVE:
1da177e4 795#ifdef CONFIG_INET
3e10986d
ED		 796 if (sk->sk_protocol == IPPROTO_TCP &&
797 sk->sk_type == SOCK_STREAM)
e71a4783 798 tcp_set_keepalive(sk, valbool);
1da177e4 799#endif
e71a4783
SH		 800 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
801 break;
802
803 case SO_OOBINLINE:
804 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
805 break;
806
807 case SO_NO_CHECK:
28448b80 808 sk->sk_no_check_tx = valbool;
e71a4783
SH		 809 break;
810
811 case SO_PRIORITY:
5e1fccc0
EB		 812 if ((val >= 0 && val <= 6) ||
813 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 814 sk->sk_priority = val;
815 else
816 ret = -EPERM;
817 break;
818
819 case SO_LINGER:
820 if (optlen < sizeof(ling)) {
821 ret = -EINVAL; /* 1003.1g */
1da177e4 822 break;
e71a4783 823 }
2a91525c 824 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 825 ret = -EFAULT;
1da177e4 826 break;
e71a4783
SH		 827 }
828 if (!ling.l_onoff)
829 sock_reset_flag(sk, SOCK_LINGER);
830 else {
1da177e4 831#if (BITS_PER_LONG == 32)
e71a4783
SH		 832 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
833 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 834 else
e71a4783
SH		 835#endif
836 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
837 sock_set_flag(sk, SOCK_LINGER);
838 }
839 break;
840
841 case SO_BSDCOMPAT:
842 sock_warn_obsolete_bsdism("setsockopt");
843 break;
844
845 case SO_PASSCRED:
846 if (valbool)
847 set_bit(SOCK_PASSCRED, &sock->flags);
848 else
849 clear_bit(SOCK_PASSCRED, &sock->flags);
850 break;
851
852 case SO_TIMESTAMP:
92f37fd2 853 case SO_TIMESTAMPNS:
e71a4783 854 if (valbool) {
92f37fd2
ED		 855 if (optname == SO_TIMESTAMP)
856 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
857 else
858 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 859 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 860 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 861 } else {
e71a4783 862 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 863 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
864 }
e71a4783
SH		 865 break;
866
20d49473
PO		 867 case SO_TIMESTAMPING:
868 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 869 ret = -EINVAL;
20d49473
PO		 870 break;
871 }
b245be1f 872
09c2d251 873 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765 874 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
ac5cc977
WC		 875 if (sk->sk_protocol == IPPROTO_TCP &&
876 sk->sk_type == SOCK_STREAM) {
4ed2d765
WB		 877 if (sk->sk_state != TCP_ESTABLISHED) {
878 ret = -EINVAL;
879 break;
880 }
881 sk->sk_tskey = tcp_sk(sk)->snd_una;
882 } else {
883 sk->sk_tskey = 0;
884 }
885 }
b9f40e21 886 sk->sk_tsflags = val;
20d49473
PO		 887 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
888 sock_enable_timestamp(sk,
889 SOCK_TIMESTAMPING_RX_SOFTWARE);
890 else
891 sock_disable_timestamp(sk,
08e29af3 892 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 893 break;
894
e71a4783
SH		 895 case SO_RCVLOWAT:
896 if (val < 0)
897 val = INT_MAX;
898 sk->sk_rcvlowat = val ? : 1;
899 break;
900
901 case SO_RCVTIMEO:
902 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
903 break;
904
905 case SO_SNDTIMEO:
906 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
907 break;
1da177e4 908
e71a4783
SH		 909 case SO_ATTACH_FILTER:
910 ret = -EINVAL;
911 if (optlen == sizeof(struct sock_fprog)) {
912 struct sock_fprog fprog;
1da177e4 913
e71a4783
SH		 914 ret = -EFAULT;
915 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 916 break;
e71a4783
SH		 917
918 ret = sk_attach_filter(&fprog, sk);
919 }
920 break;
921
89aa0758
AS		 922 case SO_ATTACH_BPF:
923 ret = -EINVAL;
924 if (optlen == sizeof(u32)) {
925 u32 ufd;
926
927 ret = -EFAULT;
928 if (copy_from_user(&ufd, optval, sizeof(ufd)))
929 break;
930
931 ret = sk_attach_bpf(ufd, sk);
932 }
933 break;
934
e71a4783 935 case SO_DETACH_FILTER:
55b33325 936 ret = sk_detach_filter(sk);
e71a4783 937 break;
1da177e4 938
d59577b6
VB		 939 case SO_LOCK_FILTER:
940 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
941 ret = -EPERM;
942 else
943 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
944 break;
945
e71a4783
SH		 946 case SO_PASSSEC:
947 if (valbool)
948 set_bit(SOCK_PASSSEC, &sock->flags);
949 else
950 clear_bit(SOCK_PASSSEC, &sock->flags);
951 break;
4a19ec58 952 case SO_MARK:
5e1fccc0 953 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 954 ret = -EPERM;
2a91525c 955 else
4a19ec58 956 sk->sk_mark = val;
4a19ec58 957 break;
877ce7c1 958
3b885787 959 case SO_RXQ_OVFL:
8083f0fc 960 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 961 break;
6e3e939f
JB		 962
963 case SO_WIFI_STATUS:
964 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
965 break;
966
ef64a54f
PE		 967 case SO_PEEK_OFF:
968 if (sock->ops->set_peek_off)
12663bfc 969 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 970 else
971 ret = -EOPNOTSUPP;
972 break;
3bdc0eba
BG		 973
974 case SO_NOFCS:
975 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
976 break;
977
7d4c04fc
KJ		 978 case SO_SELECT_ERR_QUEUE:
979 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
980 break;
981
e0d1095a 982#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 983 case SO_BUSY_POLL:
dafcc438
ET		 984 /* allow unprivileged users to decrease the value */
985 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
986 ret = -EPERM;
987 else {
988 if (val < 0)
989 ret = -EINVAL;
990 else
991 sk->sk_ll_usec = val;
992 }
993 break;
994#endif
62748f32
ED		 995
996 case SO_MAX_PACING_RATE:
997 sk->sk_max_pacing_rate = val;
998 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
999 sk->sk_max_pacing_rate);
1000 break;
1001
70da268b
ED		 1002 case SO_INCOMING_CPU:
1003 sk->sk_incoming_cpu = val;
1004 break;
1005
e71a4783
SH		 1006 default:
1007 ret = -ENOPROTOOPT;
1008 break;
4ec93edb 1009 }
1da177e4
LT		 1010 release_sock(sk);
1011 return ret;
1012}
2a91525c 1013EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 1014
1015
8f09898b 1016static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1017 struct ucred *ucred)
3f551f94
EB		 1018{
1019 ucred->pid = pid_vnr(pid);
1020 ucred->uid = ucred->gid = -1;
1021 if (cred) {
1022 struct user_namespace *current_ns = current_user_ns();
1023
b2e4f544
EB		 1024 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1025 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 1026 }
1027}
1028
1da177e4
LT		 1029int sock_getsockopt(struct socket *sock, int level, int optname,
1030 char __user *optval, int __user *optlen)
1031{
1032 struct sock *sk = sock->sk;
4ec93edb 1033
e71a4783 1034 union {
4ec93edb
YH		 1035 int val;
1036 struct linger ling;
1da177e4
LT		 1037 struct timeval tm;
1038 } v;
4ec93edb 1039
4d0392be 1040 int lv = sizeof(int);
1da177e4 1041 int len;
4ec93edb 1042
e71a4783 1043 if (get_user(len, optlen))
4ec93edb 1044 return -EFAULT;
e71a4783 1045 if (len < 0)
1da177e4 1046 return -EINVAL;
4ec93edb 1047
50fee1de 1048 memset(&v, 0, sizeof(v));
df0bca04 1049
2a91525c 1050 switch (optname) {
e71a4783
SH		 1051 case SO_DEBUG:
1052 v.val = sock_flag(sk, SOCK_DBG);
1053 break;
1054
1055 case SO_DONTROUTE:
1056 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1057 break;
1058
1059 case SO_BROADCAST:
1b23a5df 1060 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1061 break;
1062
1063 case SO_SNDBUF:
1064 v.val = sk->sk_sndbuf;
1065 break;
1066
1067 case SO_RCVBUF:
1068 v.val = sk->sk_rcvbuf;
1069 break;
1070
1071 case SO_REUSEADDR:
1072 v.val = sk->sk_reuse;
1073 break;
1074
055dc21a
TH		 1075 case SO_REUSEPORT:
1076 v.val = sk->sk_reuseport;
1077 break;
1078
e71a4783 1079 case SO_KEEPALIVE:
1b23a5df 1080 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1081 break;
1082
1083 case SO_TYPE:
1084 v.val = sk->sk_type;
1085 break;
1086
49c794e9
JE		 1087 case SO_PROTOCOL:
1088 v.val = sk->sk_protocol;
1089 break;
1090
0d6038ee
JE		 1091 case SO_DOMAIN:
1092 v.val = sk->sk_family;
1093 break;
1094
e71a4783
SH		 1095 case SO_ERROR:
1096 v.val = -sock_error(sk);
2a91525c 1097 if (v.val == 0)
e71a4783
SH		 1098 v.val = xchg(&sk->sk_err_soft, 0);
1099 break;
1100
1101 case SO_OOBINLINE:
1b23a5df 1102 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1103 break;
1104
1105 case SO_NO_CHECK:
28448b80 1106 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1107 break;
1108
1109 case SO_PRIORITY:
1110 v.val = sk->sk_priority;
1111 break;
1112
1113 case SO_LINGER:
1114 lv = sizeof(v.ling);
1b23a5df 1115 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1116 v.ling.l_linger = sk->sk_lingertime / HZ;
1117 break;
1118
1119 case SO_BSDCOMPAT:
1120 sock_warn_obsolete_bsdism("getsockopt");
1121 break;
1122
1123 case SO_TIMESTAMP:
92f37fd2
ED		 1124 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1125 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1126 break;
1127
1128 case SO_TIMESTAMPNS:
1129 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1130 break;
1131
20d49473 1132 case SO_TIMESTAMPING:
b9f40e21 1133 v.val = sk->sk_tsflags;
20d49473
PO		 1134 break;
1135
e71a4783 1136 case SO_RCVTIMEO:
2a91525c 1137 lv = sizeof(struct timeval);
e71a4783
SH		 1138 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1139 v.tm.tv_sec = 0;
1140 v.tm.tv_usec = 0;
1141 } else {
1142 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1143 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1144 }
1145 break;
1146
1147 case SO_SNDTIMEO:
2a91525c 1148 lv = sizeof(struct timeval);
e71a4783
SH		 1149 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1150 v.tm.tv_sec = 0;
1151 v.tm.tv_usec = 0;
1152 } else {
1153 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1154 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1155 }
1156 break;
1da177e4 1157
e71a4783
SH		 1158 case SO_RCVLOWAT:
1159 v.val = sk->sk_rcvlowat;
1160 break;
1da177e4 1161
e71a4783 1162 case SO_SNDLOWAT:
2a91525c 1163 v.val = 1;
e71a4783 1164 break;
1da177e4 1165
e71a4783 1166 case SO_PASSCRED:
82981930 1167 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1168 break;
1da177e4 1169
e71a4783 1170 case SO_PEERCRED:
109f6e39
EB		 1171 {
1172 struct ucred peercred;
1173 if (len > sizeof(peercred))
1174 len = sizeof(peercred);
1175 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1176 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1177 return -EFAULT;
1178 goto lenout;
109f6e39 1179 }
1da177e4 1180
e71a4783
SH		 1181 case SO_PEERNAME:
1182 {
1183 char address[128];
1184
1185 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1186 return -ENOTCONN;
1187 if (lv < len)
1188 return -EINVAL;
1189 if (copy_to_user(optval, address, len))
1190 return -EFAULT;
1191 goto lenout;
1192 }
1da177e4 1193
e71a4783
SH		 1194 /* Dubious BSD thing... Probably nobody even uses it, but
1195 * the UNIX standard wants it for whatever reason... -DaveM
1196 */
1197 case SO_ACCEPTCONN:
1198 v.val = sk->sk_state == TCP_LISTEN;
1199 break;
1da177e4 1200
e71a4783 1201 case SO_PASSSEC:
82981930 1202 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1203 break;
877ce7c1 1204
e71a4783
SH		 1205 case SO_PEERSEC:
1206 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1207
4a19ec58
LAT		 1208 case SO_MARK:
1209 v.val = sk->sk_mark;
1210 break;
1211
3b885787 1212 case SO_RXQ_OVFL:
1b23a5df 1213 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1214 break;
1215
6e3e939f 1216 case SO_WIFI_STATUS:
1b23a5df 1217 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1218 break;
1219
ef64a54f
PE		 1220 case SO_PEEK_OFF:
1221 if (!sock->ops->set_peek_off)
1222 return -EOPNOTSUPP;
1223
1224 v.val = sk->sk_peek_off;
1225 break;
bc2f7996 1226 case SO_NOFCS:
1b23a5df 1227 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1228 break;
c91f6df2 1229
f7b86bfe 1230 case SO_BINDTODEVICE:
c91f6df2
BH		 1231 return sock_getbindtodevice(sk, optval, optlen, len);
1232
a8fc9277
PE		 1233 case SO_GET_FILTER:
1234 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1235 if (len < 0)
1236 return len;
1237
1238 goto lenout;
c91f6df2 1239
d59577b6
VB		 1240 case SO_LOCK_FILTER:
1241 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1242 break;
1243
ea02f941
MS		 1244 case SO_BPF_EXTENSIONS:
1245 v.val = bpf_tell_extensions();
1246 break;
1247
7d4c04fc
KJ		 1248 case SO_SELECT_ERR_QUEUE:
1249 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1250 break;
1251
e0d1095a 1252#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1253 case SO_BUSY_POLL:
dafcc438
ET		 1254 v.val = sk->sk_ll_usec;
1255 break;
1256#endif
1257
62748f32
ED		 1258 case SO_MAX_PACING_RATE:
1259 v.val = sk->sk_max_pacing_rate;
1260 break;
1261
2c8c56e1
ED		 1262 case SO_INCOMING_CPU:
1263 v.val = sk->sk_incoming_cpu;
1264 break;
1265
e71a4783 1266 default:
443b5991
YH		 1267 /* We implement the SO_SNDLOWAT etc to not be settable
1268 * (1003.1g 7).
1269 */
e71a4783 1270 return -ENOPROTOOPT;
1da177e4 1271 }
e71a4783 1272
1da177e4
LT		 1273 if (len > lv)
1274 len = lv;
1275 if (copy_to_user(optval, &v, len))
1276 return -EFAULT;
1277lenout:
4ec93edb
YH		 1278 if (put_user(len, optlen))
1279 return -EFAULT;
1280 return 0;
1da177e4
LT		 1281}
1282
a5b5bb9a
IM		 1283/*
1284 * Initialize an sk_lock.
1285 *
1286 * (We also register the sk_lock with the lock validator.)
1287 */
b6f99a21 1288static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1289{
ed07536e
PZ		 1290 sock_lock_init_class_and_name(sk,
1291 af_family_slock_key_strings[sk->sk_family],
1292 af_family_slock_keys + sk->sk_family,
1293 af_family_key_strings[sk->sk_family],
1294 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1295}
1296
4dc6dc71
ED		 1297/*
1298 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1299 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1300 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1301 */
f1a6c4da
PE		 1302static void sock_copy(struct sock *nsk, const struct sock *osk)
1303{
1304#ifdef CONFIG_SECURITY_NETWORK
1305 void *sptr = nsk->sk_security;
1306#endif
68835aba
ED		 1307 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1308
1309 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1310 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1311
f1a6c4da
PE		 1312#ifdef CONFIG_SECURITY_NETWORK
1313 nsk->sk_security = sptr;
1314 security_sk_clone(osk, nsk);
1315#endif
1316}
1317
fcbdf09d
OP		 1318void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1319{
1320 unsigned long nulls1, nulls2;
1321
1322 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1323 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1324 if (nulls1 > nulls2)
1325 swap(nulls1, nulls2);
1326
1327 if (nulls1 != 0)
1328 memset((char *)sk, 0, nulls1);
1329 memset((char *)sk + nulls1 + sizeof(void *), 0,
1330 nulls2 - nulls1 - sizeof(void *));
1331 memset((char *)sk + nulls2 + sizeof(void *), 0,
1332 size - nulls2 - sizeof(void *));
1333}
1334EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1335
2e4afe7b
PE		 1336static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1337 int family)
c308c1b2
PE		 1338{
1339 struct sock *sk;
1340 struct kmem_cache *slab;
1341
1342 slab = prot->slab;
e912b114
ED		 1343 if (slab != NULL) {
1344 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1345 if (!sk)
1346 return sk;
1347 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1348 if (prot->clear_sk)
1349 prot->clear_sk(sk, prot->obj_size);
1350 else
1351 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1352 }
fcbdf09d 1353 } else
c308c1b2
PE		 1354 sk = kmalloc(prot->obj_size, priority);
1355
2e4afe7b 1356 if (sk != NULL) {
a98b65a3
VN		 1357 kmemcheck_annotate_bitfield(sk, flags);
1358
2e4afe7b
PE		 1359 if (security_sk_alloc(sk, family, priority))
1360 goto out_free;
1361
1362 if (!try_module_get(prot->owner))
1363 goto out_free_sec;
e022f0b4 1364 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1365 }
1366
c308c1b2 1367 return sk;
2e4afe7b
PE		 1368
1369out_free_sec:
1370 security_sk_free(sk);
1371out_free:
1372 if (slab != NULL)
1373 kmem_cache_free(slab, sk);
1374 else
1375 kfree(sk);
1376 return NULL;
c308c1b2
PE		 1377}
1378
1379static void sk_prot_free(struct proto *prot, struct sock *sk)
1380{
1381 struct kmem_cache *slab;
2e4afe7b 1382 struct module *owner;
c308c1b2 1383
2e4afe7b 1384 owner = prot->owner;
c308c1b2 1385 slab = prot->slab;
2e4afe7b
PE		 1386
1387 security_sk_free(sk);
c308c1b2
PE		 1388 if (slab != NULL)
1389 kmem_cache_free(slab, sk);
1390 else
1391 kfree(sk);
2e4afe7b 1392 module_put(owner);
c308c1b2
PE		 1393}
1394
86f8515f 1395#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
6ffd4641 1396void sock_update_netprioidx(struct sock *sk)
5bc1421e 1397{
5bc1421e
NH		 1398 if (in_interrupt())
1399 return;
2b73bc65 1400
6ffd4641 1401 sk->sk_cgrp_prioidx = task_netprioidx(current);
5bc1421e
NH		 1402}
1403EXPORT_SYMBOL_GPL(sock_update_netprioidx);
f8451725
HX		 1404#endif
1405
1da177e4
LT		 1406/**
1407 * sk_alloc - All socket objects are allocated here
c4ea43c5 1408 * @net: the applicable net namespace
4dc3b16b
PP		 1409 * @family: protocol family
1410 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1411 * @prot: struct proto associated with this new sock instance
11aa9c28 1412 * @kern: is this to be a kernel socket?
1da177e4 1413 */
1b8d7ae4 1414struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
11aa9c28 1415 struct proto *prot, int kern)
1da177e4 1416{
c308c1b2 1417 struct sock *sk;
1da177e4 1418
154adbc8 1419 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1420 if (sk) {
154adbc8
PE		 1421 sk->sk_family = family;
1422 /*
1423 * See comment in struct sock definition to understand
1424 * why we need sk_prot_creator -acme
1425 */
1426 sk->sk_prot = sk->sk_prot_creator = prot;
1427 sock_lock_init(sk);
26abe143
EB		 1428 sk->sk_net_refcnt = kern ? 0 : 1;
1429 if (likely(sk->sk_net_refcnt))
1430 get_net(net);
1431 sock_net_set(sk, net);
d66ee058 1432 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1433
211d2f97 1434 sock_update_classid(sk);
6ffd4641 1435 sock_update_netprioidx(sk);
1da177e4 1436 }
a79af59e 1437
2e4afe7b 1438 return sk;
1da177e4 1439}
2a91525c 1440EXPORT_SYMBOL(sk_alloc);
1da177e4 1441
eb4cb008 1442void sk_destruct(struct sock *sk)
1da177e4
LT		 1443{
1444 struct sk_filter *filter;
1da177e4
LT		 1445
1446 if (sk->sk_destruct)
1447 sk->sk_destruct(sk);
1448
a898def2
PM		 1449 filter = rcu_dereference_check(sk->sk_filter,
1450 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1451 if (filter) {
309dd5fc 1452 sk_filter_uncharge(sk, filter);
a9b3cd7f 1453 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1454 }
1455
08e29af3 1456 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1457
1458 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1459 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1460 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1461
109f6e39
EB		 1462 if (sk->sk_peer_cred)
1463 put_cred(sk->sk_peer_cred);
1464 put_pid(sk->sk_peer_pid);
26abe143
EB		 1465 if (likely(sk->sk_net_refcnt))
1466 put_net(sock_net(sk));
c308c1b2 1467 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1468}
2b85a34e 1469
eb4cb008
CG		 1470static void __sk_free(struct sock *sk)
1471{
b922622e 1472 if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt))
eb4cb008
CG		 1473 sock_diag_broadcast_destroy(sk);
1474 else
1475 sk_destruct(sk);
1476}
1477
2b85a34e
ED		 1478void sk_free(struct sock *sk)
1479{
1480 /*
25985edc 1481 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1482 * some packets are still in some tx queue.
1483 * If not null, sock_wfree() will call __sk_free(sk) later
1484 */
1485 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1486 __sk_free(sk);
1487}
2a91525c 1488EXPORT_SYMBOL(sk_free);
1da177e4 1489
475f1b52
SR		 1490static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1491{
1492 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1493 sock_update_memcg(newsk);
1494}
1495
e56c57d0
ED		 1496/**
1497 * sk_clone_lock - clone a socket, and lock its clone
1498 * @sk: the socket to clone
1499 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1500 *
1501 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1502 */
1503struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1504{
8fd1d178 1505 struct sock *newsk;
278571ba 1506 bool is_charged = true;
87d11ceb 1507
8fd1d178 1508 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1509 if (newsk != NULL) {
1510 struct sk_filter *filter;
1511
892c141e 1512 sock_copy(newsk, sk);
87d11ceb
ACM		 1513
1514 /* SANITY */
8a681736
SV		 1515 if (likely(newsk->sk_net_refcnt))
1516 get_net(sock_net(newsk));
87d11ceb
ACM		 1517 sk_node_init(&newsk->sk_node);
1518 sock_lock_init(newsk);
1519 bh_lock_sock(newsk);
fa438ccf 1520 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1521 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1522
1523 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1524 /*
1525 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1526 */
1527 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1528 atomic_set(&newsk->sk_omem_alloc, 0);
1529 skb_queue_head_init(&newsk->sk_receive_queue);
1530 skb_queue_head_init(&newsk->sk_write_queue);
1531
87d11ceb 1532 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1533 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1534 af_callback_keys + newsk->sk_family,
1535 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1536
1537 newsk->sk_dst_cache = NULL;
1538 newsk->sk_wmem_queued = 0;
1539 newsk->sk_forward_alloc = 0;
1540 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1541 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1542
1543 sock_reset_flag(newsk, SOCK_DONE);
1544 skb_queue_head_init(&newsk->sk_error_queue);
1545
0d7da9dd 1546 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb 1547 if (filter != NULL)
278571ba
AS		 1548 /* though it's an empty new sock, the charging may fail
1549 * if sysctl_optmem_max was changed between creation of
1550 * original socket and cloning
1551 */
1552 is_charged = sk_filter_charge(newsk, filter);
87d11ceb 1553
d188ba86 1554 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
87d11ceb
ACM		 1555 /* It is still raw copy of parent, so invalidate
1556 * destructor and make plain sk_free() */
1557 newsk->sk_destruct = NULL;
b0691c8e 1558 bh_unlock_sock(newsk);
87d11ceb
ACM		 1559 sk_free(newsk);
1560 newsk = NULL;
1561 goto out;
1562 }
1563
1564 newsk->sk_err = 0;
1565 newsk->sk_priority = 0;
2c8c56e1 1566 newsk->sk_incoming_cpu = raw_smp_processor_id();
33cf7c90 1567 atomic64_set(&newsk->sk_cookie, 0);
4dc6dc71
ED		 1568 /*
1569 * Before updating sk_refcnt, we must commit prior changes to memory
1570 * (Documentation/RCU/rculist_nulls.txt for details)
1571 */
1572 smp_wmb();
87d11ceb
ACM		 1573 atomic_set(&newsk->sk_refcnt, 2);
1574
1575 /*
1576 * Increment the counter in the same struct proto as the master
1577 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1578 * is the same as sk->sk_prot->socks, as this field was copied
1579 * with memcpy).
1580 *
1581 * This _changes_ the previous behaviour, where
1582 * tcp_create_openreq_child always was incrementing the
1583 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1584 * to be taken into account in all callers. -acme
1585 */
1586 sk_refcnt_debug_inc(newsk);
972692e0 1587 sk_set_socket(newsk, NULL);
43815482 1588 newsk->sk_wq = NULL;
87d11ceb 1589
f3f511e1
GC		 1590 sk_update_clone(sk, newsk);
1591
87d11ceb 1592 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1593 sk_sockets_allocated_inc(newsk);
704da560 1594
080a270f
HFS		 1595 if (sock_needs_netstamp(sk) &&
1596 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1597 net_enable_timestamp();
87d11ceb
ACM		 1598 }
1599out:
1600 return newsk;
1601}
e56c57d0 1602EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1603
9958089a
AK		 1604void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1605{
d6a4e26a
ED		 1606 u32 max_segs = 1;
1607
6bd4f355 1608 sk_dst_set(sk, dst);
9958089a
AK		 1609 sk->sk_route_caps = dst->dev->features;
1610 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1611 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1612 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1613 if (sk_can_gso(sk)) {
82cc1a7a 1614 if (dst->header_len) {
9958089a 1615 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1616 } else {
9958089a 1617 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1618 sk->sk_gso_max_size = dst->dev->gso_max_size;
d6a4e26a 1619 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
82cc1a7a 1620 }
9958089a 1621 }
d6a4e26a 1622 sk->sk_gso_max_segs = max_segs;
9958089a
AK		 1623}
1624EXPORT_SYMBOL_GPL(sk_setup_caps);
1625
1da177e4
LT		 1626/*
1627 * Simple resource managers for sockets.
1628 */
1629
1630
4ec93edb
YH		 1631/*
1632 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1633 */
1634void sock_wfree(struct sk_buff *skb)
1635{
1636 struct sock *sk = skb->sk;
d99927f4 1637 unsigned int len = skb->truesize;
1da177e4 1638
d99927f4
ED		 1639 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1640 /*
1641 * Keep a reference on sk_wmem_alloc, this will be released
1642 * after sk_write_space() call
1643 */
1644 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1645 sk->sk_write_space(sk);
d99927f4
ED		 1646 len = 1;
1647 }
2b85a34e 1648 /*
d99927f4
ED		 1649 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1650 * could not do because of in-flight packets
2b85a34e 1651 */
d99927f4 1652 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1653 __sk_free(sk);
1da177e4 1654}
2a91525c 1655EXPORT_SYMBOL(sock_wfree);
1da177e4 1656
9e17f8a4
ED		 1657void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1658{
1659 skb_orphan(skb);
1660 skb->sk = sk;
1661#ifdef CONFIG_INET
1662 if (unlikely(!sk_fullsock(sk))) {
1663 skb->destructor = sock_edemux;
1664 sock_hold(sk);
1665 return;
1666 }
1667#endif
1668 skb->destructor = sock_wfree;
1669 skb_set_hash_from_sk(skb, sk);
1670 /*
1671 * We used to take a refcount on sk, but following operation
1672 * is enough to guarantee sk_free() wont free this sock until
1673 * all in-flight packets are completed
1674 */
1675 atomic_add(skb->truesize, &sk->sk_wmem_alloc);
1676}
1677EXPORT_SYMBOL(skb_set_owner_w);
1678
f2f872f9
ED		 1679void skb_orphan_partial(struct sk_buff *skb)
1680{
1681 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1682 * so we do not completely orphan skb, but transfert all
1683 * accounted bytes but one, to avoid unexpected reorders.
1684 */
1685 if (skb->destructor == sock_wfree
1686#ifdef CONFIG_INET
1687 || skb->destructor == tcp_wfree
1688#endif
1689 ) {
1690 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1691 skb->truesize = 1;
1692 } else {
1693 skb_orphan(skb);
1694 }
1695}
1696EXPORT_SYMBOL(skb_orphan_partial);
1697
4ec93edb
YH		 1698/*
1699 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1700 */
1701void sock_rfree(struct sk_buff *skb)
1702{
1703 struct sock *sk = skb->sk;
d361fd59 1704 unsigned int len = skb->truesize;
1da177e4 1705
d361fd59
ED		 1706 atomic_sub(len, &sk->sk_rmem_alloc);
1707 sk_mem_uncharge(sk, len);
1da177e4 1708}
2a91525c 1709EXPORT_SYMBOL(sock_rfree);
1da177e4 1710
7768eed8
OH		 1711/*
1712 * Buffer destructor for skbs that are not used directly in read or write
1713 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1714 */
62bccb8c
AD		 1715void sock_efree(struct sk_buff *skb)
1716{
1717 sock_put(skb->sk);
1718}
1719EXPORT_SYMBOL(sock_efree);
1720
976d0201 1721kuid_t sock_i_uid(struct sock *sk)
1da177e4 1722{
976d0201 1723 kuid_t uid;
1da177e4 1724
f064af1e 1725 read_lock_bh(&sk->sk_callback_lock);
976d0201 1726 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1727 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1728 return uid;
1729}
2a91525c 1730EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1731
1732unsigned long sock_i_ino(struct sock *sk)
1733{
1734 unsigned long ino;
1735
f064af1e 1736 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1737 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1738 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1739 return ino;
1740}
2a91525c 1741EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1742
1743/*
1744 * Allocate a skb from the socket's send buffer.
1745 */
86a76caf 1746struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1747 gfp_t priority)
1da177e4
LT		 1748{
1749 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1750 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1751 if (skb) {
1752 skb_set_owner_w(skb, sk);
1753 return skb;
1754 }
1755 }
1756 return NULL;
1757}
2a91525c 1758EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1759
4ec93edb 1760/*
1da177e4 1761 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1762 */
dd0fc66f 1763void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1764{
95c96174 1765 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1766 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1767 void *mem;
1768 /* First do the add, to avoid the race if kmalloc
4ec93edb 1769 * might sleep.
1da177e4
LT		 1770 */
1771 atomic_add(size, &sk->sk_omem_alloc);
1772 mem = kmalloc(size, priority);
1773 if (mem)
1774 return mem;
1775 atomic_sub(size, &sk->sk_omem_alloc);
1776 }
1777 return NULL;
1778}
2a91525c 1779EXPORT_SYMBOL(sock_kmalloc);
1da177e4 1780
79e88659
DB		 1781/* Free an option memory block. Note, we actually want the inline
1782 * here as this allows gcc to detect the nullify and fold away the
1783 * condition entirely.
1da177e4 1784 */
79e88659
DB		 1785static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1786 const bool nullify)
1da177e4 1787{
e53da5fb
DM		 1788 if (WARN_ON_ONCE(!mem))
1789 return;
79e88659
DB		 1790 if (nullify)
1791 kzfree(mem);
1792 else
1793 kfree(mem);
1da177e4
LT		 1794 atomic_sub(size, &sk->sk_omem_alloc);
1795}
79e88659
DB		 1796
1797void sock_kfree_s(struct sock *sk, void *mem, int size)
1798{
1799 __sock_kfree_s(sk, mem, size, false);
1800}
2a91525c 1801EXPORT_SYMBOL(sock_kfree_s);
1da177e4 1802
79e88659
DB		 1803void sock_kzfree_s(struct sock *sk, void *mem, int size)
1804{
1805 __sock_kfree_s(sk, mem, size, true);
1806}
1807EXPORT_SYMBOL(sock_kzfree_s);
1808
1da177e4
LT		 1809/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1810 I think, these locks should be removed for datagram sockets.
1811 */
2a91525c 1812static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1813{
1814 DEFINE_WAIT(wait);
1815
9cd3e072 1816 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1da177e4
LT		 1817 for (;;) {
1818 if (!timeo)
1819 break;
1820 if (signal_pending(current))
1821 break;
1822 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1823 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1824 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1825 break;
1826 if (sk->sk_shutdown & SEND_SHUTDOWN)
1827 break;
1828 if (sk->sk_err)
1829 break;
1830 timeo = schedule_timeout(timeo);
1831 }
aa395145 1832 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1833 return timeo;
1834}
1835
1836
1837/*
1838 * Generic send/receive buffer handlers
1839 */
1840
4cc7f68d
HX		 1841struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1842 unsigned long data_len, int noblock,
28d64271 1843 int *errcode, int max_page_order)
1da177e4 1844{
2e4e4410 1845 struct sk_buff *skb;
1da177e4
LT		 1846 long timeo;
1847 int err;
1848
1da177e4 1849 timeo = sock_sndtimeo(sk, noblock);
2e4e4410 1850 for (;;) {
1da177e4
LT		 1851 err = sock_error(sk);
1852 if (err != 0)
1853 goto failure;
1854
1855 err = -EPIPE;
1856 if (sk->sk_shutdown & SEND_SHUTDOWN)
1857 goto failure;
1858
2e4e4410
ED		 1859 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
1860 break;
28d64271 1861
9cd3e072 1862 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2e4e4410
ED		 1863 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1864 err = -EAGAIN;
1865 if (!timeo)
1da177e4 1866 goto failure;
2e4e4410
ED		 1867 if (signal_pending(current))
1868 goto interrupted;
1869 timeo = sock_wait_for_wmem(sk, timeo);
1da177e4 1870 }
2e4e4410
ED		 1871 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
1872 errcode, sk->sk_allocation);
1873 if (skb)
1874 skb_set_owner_w(skb, sk);
1da177e4
LT		 1875 return skb;
1876
1877interrupted:
1878 err = sock_intr_errno(timeo);
1879failure:
1880 *errcode = err;
1881 return NULL;
1882}
4cc7f68d 1883EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1884
4ec93edb 1885struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1886 int noblock, int *errcode)
1887{
28d64271 1888 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1889}
2a91525c 1890EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1891
f28ea365
EJ		 1892int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
1893 struct sockcm_cookie *sockc)
1894{
1895 struct cmsghdr *cmsg;
1896
1897 for_each_cmsghdr(cmsg, msg) {
1898 if (!CMSG_OK(msg, cmsg))
1899 return -EINVAL;
1900 if (cmsg->cmsg_level != SOL_SOCKET)
1901 continue;
1902 switch (cmsg->cmsg_type) {
1903 case SO_MARK:
1904 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1905 return -EPERM;
1906 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
1907 return -EINVAL;
1908 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
1909 break;
1910 default:
1911 return -EINVAL;
1912 }
1913 }
1914 return 0;
1915}
1916EXPORT_SYMBOL(sock_cmsg_send);
1917
5640f768
ED		 1918/* On 32bit arches, an skb frag is limited to 2^15 */
1919#define SKB_FRAG_PAGE_ORDER get_order(32768)
1920
400dfd3a
ED		 1921/**
1922 * skb_page_frag_refill - check that a page_frag contains enough room
1923 * @sz: minimum size of the fragment we want to get
1924 * @pfrag: pointer to page_frag
82d5e2b8 1925 * @gfp: priority for memory allocation
400dfd3a
ED		 1926 *
1927 * Note: While this allocator tries to use high order pages, there is
1928 * no guarantee that allocations succeed. Therefore, @sz MUST be
1929 * less or equal than PAGE_SIZE.
1930 */
d9b2938a 1931bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 1932{
5640f768
ED		 1933 if (pfrag->page) {
1934 if (atomic_read(&pfrag->page->_count) == 1) {
1935 pfrag->offset = 0;
1936 return true;
1937 }
400dfd3a 1938 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1939 return true;
1940 put_page(pfrag->page);
1941 }
1942
d9b2938a
ED		 1943 pfrag->offset = 0;
1944 if (SKB_FRAG_PAGE_ORDER) {
d0164adc
MG		 1945 /* Avoid direct reclaim but allow kswapd to wake */
1946 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
1947 __GFP_COMP | __GFP_NOWARN |
1948 __GFP_NORETRY,
d9b2938a 1949 SKB_FRAG_PAGE_ORDER);
5640f768 1950 if (likely(pfrag->page)) {
d9b2938a 1951 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 1952 return true;
1953 }
d9b2938a
ED		 1954 }
1955 pfrag->page = alloc_page(gfp);
1956 if (likely(pfrag->page)) {
1957 pfrag->size = PAGE_SIZE;
1958 return true;
1959 }
400dfd3a
ED		 1960 return false;
1961}
1962EXPORT_SYMBOL(skb_page_frag_refill);
1963
1964bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1965{
1966 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1967 return true;
1968
5640f768
ED		 1969 sk_enter_memory_pressure(sk);
1970 sk_stream_moderate_sndbuf(sk);
1971 return false;
1972}
1973EXPORT_SYMBOL(sk_page_frag_refill);
1974
1da177e4 1975static void __lock_sock(struct sock *sk)
f39234d6
NK		 1976 __releases(&sk->sk_lock.slock)
1977 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1978{
1979 DEFINE_WAIT(wait);
1980
e71a4783 1981 for (;;) {
1da177e4
LT		 1982 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1983 TASK_UNINTERRUPTIBLE);
1984 spin_unlock_bh(&sk->sk_lock.slock);
1985 schedule();
1986 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1987 if (!sock_owned_by_user(sk))
1da177e4
LT		 1988 break;
1989 }
1990 finish_wait(&sk->sk_lock.wq, &wait);
1991}
1992
1993static void __release_sock(struct sock *sk)
f39234d6
NK		 1994 __releases(&sk->sk_lock.slock)
1995 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1996{
1997 struct sk_buff *skb = sk->sk_backlog.head;
1998
1999 do {
2000 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
2001 bh_unlock_sock(sk);
2002
2003 do {
2004 struct sk_buff *next = skb->next;
2005
e4cbb02a 2006 prefetch(next);
7fee226a 2007 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 2008 skb->next = NULL;
c57943a1 2009 sk_backlog_rcv(sk, skb);
1da177e4
LT		 2010
2011 /*
2012 * We are in process context here with softirqs
2013 * disabled, use cond_resched_softirq() to preempt.
2014 * This is safe to do because we've taken the backlog
2015 * queue private:
2016 */
2017 cond_resched_softirq();
2018
2019 skb = next;
2020 } while (skb != NULL);
2021
2022 bh_lock_sock(sk);
e71a4783 2023 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 2024
2025 /*
2026 * Doing the zeroing here guarantee we can not loop forever
2027 * while a wild producer attempts to flood us.
2028 */
2029 sk->sk_backlog.len = 0;
1da177e4
LT		 2030}
2031
2032/**
2033 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 2034 * @sk: sock to wait on
2035 * @timeo: for how long
dfbafc99 2036 * @skb: last skb seen on sk_receive_queue
1da177e4
LT		 2037 *
2038 * Now socket state including sk->sk_err is changed only under lock,
2039 * hence we may omit checks after joining wait queue.
2040 * We check receive queue before schedule() only as optimization;
2041 * it is very likely that release_sock() added new data.
2042 */
dfbafc99 2043int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
1da177e4
LT		 2044{
2045 int rc;
2046 DEFINE_WAIT(wait);
2047
aa395145 2048 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9cd3e072 2049 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
dfbafc99 2050 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb);
9cd3e072 2051 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
aa395145 2052 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 2053 return rc;
2054}
1da177e4
LT		 2055EXPORT_SYMBOL(sk_wait_data);
2056
3ab224be
HA		 2057/**
2058 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2059 * @sk: socket
2060 * @size: memory size to allocate
2061 * @kind: allocation type
2062 *
2063 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2064 * rmem allocation. This function assumes that protocols which have
2065 * memory_pressure use sk_wmem_queued as write buffer accounting.
2066 */
2067int __sk_mem_schedule(struct sock *sk, int size, int kind)
2068{
2069 struct proto *prot = sk->sk_prot;
2070 int amt = sk_mem_pages(size);
8d987e5c 2071 long allocated;
e1aab161 2072 int parent_status = UNDER_LIMIT;
3ab224be
HA		 2073
2074 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 2075
e1aab161 2076 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 2077
2078 /* Under limit. */
e1aab161
GC		 2079 if (parent_status == UNDER_LIMIT &&
2080 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2081 sk_leave_memory_pressure(sk);
3ab224be
HA		 2082 return 1;
2083 }
2084
e1aab161
GC		 2085 /* Under pressure. (we or our parents) */
2086 if ((parent_status > SOFT_LIMIT) ||
2087 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2088 sk_enter_memory_pressure(sk);
3ab224be 2089
e1aab161
GC		 2090 /* Over hard limit (we or our parents) */
2091 if ((parent_status == OVER_LIMIT) ||
2092 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 2093 goto suppress_allocation;
2094
2095 /* guarantee minimum buffer size under pressure */
2096 if (kind == SK_MEM_RECV) {
2097 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2098 return 1;
180d8cd9 2099
3ab224be
HA		 2100 } else { /* SK_MEM_SEND */
2101 if (sk->sk_type == SOCK_STREAM) {
2102 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2103 return 1;
2104 } else if (atomic_read(&sk->sk_wmem_alloc) <
2105 prot->sysctl_wmem[0])
2106 return 1;
2107 }
2108
180d8cd9 2109 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2110 int alloc;
2111
180d8cd9 2112 if (!sk_under_memory_pressure(sk))
1748376b 2113 return 1;
180d8cd9
GC		 2114 alloc = sk_sockets_allocated_read_positive(sk);
2115 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2116 sk_mem_pages(sk->sk_wmem_queued +
2117 atomic_read(&sk->sk_rmem_alloc) +
2118 sk->sk_forward_alloc))
2119 return 1;
2120 }
2121
2122suppress_allocation:
2123
2124 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2125 sk_stream_moderate_sndbuf(sk);
2126
2127 /* Fail only if socket is _under_ its sndbuf.
2128 * In this case we cannot block, so that we have to fail.
2129 */
2130 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2131 return 1;
2132 }
2133
3847ce32
SM		 2134 trace_sock_exceed_buf_limit(sk, prot, allocated);
2135
3ab224be
HA		 2136 /* Alas. Undo changes. */
2137 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2138
0e90b31f 2139 sk_memory_allocated_sub(sk, amt);
180d8cd9 2140
3ab224be
HA		 2141 return 0;
2142}
3ab224be
HA		 2143EXPORT_SYMBOL(__sk_mem_schedule);
2144
2145/**
69dba9bb 2146 * __sk_mem_reclaim - reclaim memory_allocated
3ab224be 2147 * @sk: socket
1a24e04e 2148 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
3ab224be 2149 */
1a24e04e 2150void __sk_mem_reclaim(struct sock *sk, int amount)
3ab224be 2151{
1a24e04e
ED		 2152 amount >>= SK_MEM_QUANTUM_SHIFT;
2153 sk_memory_allocated_sub(sk, amount);
2154 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
3ab224be 2155
180d8cd9
GC		 2156 if (sk_under_memory_pressure(sk) &&
2157 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2158 sk_leave_memory_pressure(sk);
3ab224be 2159}
3ab224be
HA		 2160EXPORT_SYMBOL(__sk_mem_reclaim);
2161
2162
1da177e4
LT		 2163/*
2164 * Set of default routines for initialising struct proto_ops when
2165 * the protocol does not support a particular function. In certain
2166 * cases where it makes no sense for a protocol to have a "do nothing"
2167 * function, some default processing is provided.
2168 */
2169
2170int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2171{
2172 return -EOPNOTSUPP;
2173}
2a91525c 2174EXPORT_SYMBOL(sock_no_bind);
1da177e4 2175
4ec93edb 2176int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2177 int len, int flags)
2178{
2179 return -EOPNOTSUPP;
2180}
2a91525c 2181EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2182
2183int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2184{
2185 return -EOPNOTSUPP;
2186}
2a91525c 2187EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2188
2189int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2190{
2191 return -EOPNOTSUPP;
2192}
2a91525c 2193EXPORT_SYMBOL(sock_no_accept);
1da177e4 2194
4ec93edb 2195int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2196 int *len, int peer)
2197{
2198 return -EOPNOTSUPP;
2199}
2a91525c 2200EXPORT_SYMBOL(sock_no_getname);
1da177e4 2201
2a91525c 2202unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2203{
2204 return 0;
2205}
2a91525c 2206EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2207
2208int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2209{
2210 return -EOPNOTSUPP;
2211}
2a91525c 2212EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2213
2214int sock_no_listen(struct socket *sock, int backlog)
2215{
2216 return -EOPNOTSUPP;
2217}
2a91525c 2218EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2219
2220int sock_no_shutdown(struct socket *sock, int how)
2221{
2222 return -EOPNOTSUPP;
2223}
2a91525c 2224EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2225
2226int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2227 char __user *optval, unsigned int optlen)
1da177e4
LT		 2228{
2229 return -EOPNOTSUPP;
2230}
2a91525c 2231EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2232
2233int sock_no_getsockopt(struct socket *sock, int level, int optname,
2234 char __user *optval, int __user *optlen)
2235{
2236 return -EOPNOTSUPP;
2237}
2a91525c 2238EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4 2239
1b784140 2240int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
1da177e4
LT		 2241{
2242 return -EOPNOTSUPP;
2243}
2a91525c 2244EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4 2245
1b784140
YX		 2246int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2247 int flags)
1da177e4
LT		 2248{
2249 return -EOPNOTSUPP;
2250}
2a91525c 2251EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2252
2253int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2254{
2255 /* Mirror missing mmap method error code */
2256 return -ENODEV;
2257}
2a91525c 2258EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2259
2260ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2261{
2262 ssize_t res;
2263 struct msghdr msg = {.msg_flags = flags};
2264 struct kvec iov;
2265 char *kaddr = kmap(page);
2266 iov.iov_base = kaddr + offset;
2267 iov.iov_len = size;
2268 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2269 kunmap(page);
2270 return res;
2271}
2a91525c 2272EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2273
2274/*
2275 * Default Socket Callbacks
2276 */
2277
2278static void sock_def_wakeup(struct sock *sk)
2279{
43815482
ED		 2280 struct socket_wq *wq;
2281
2282 rcu_read_lock();
2283 wq = rcu_dereference(sk->sk_wq);
2284 if (wq_has_sleeper(wq))
2285 wake_up_interruptible_all(&wq->wait);
2286 rcu_read_unlock();
1da177e4
LT		 2287}
2288
2289static void sock_def_error_report(struct sock *sk)
2290{
43815482
ED		 2291 struct socket_wq *wq;
2292
2293 rcu_read_lock();
2294 wq = rcu_dereference(sk->sk_wq);
2295 if (wq_has_sleeper(wq))
2296 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2297 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2298 rcu_read_unlock();
1da177e4
LT		 2299}
2300
676d2369 2301static void sock_def_readable(struct sock *sk)
1da177e4 2302{
43815482
ED		 2303 struct socket_wq *wq;
2304
2305 rcu_read_lock();
2306 wq = rcu_dereference(sk->sk_wq);
2307 if (wq_has_sleeper(wq))
2c6607c6 2308 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2309 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2310 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2311 rcu_read_unlock();
1da177e4
LT		 2312}
2313
2314static void sock_def_write_space(struct sock *sk)
2315{
43815482
ED		 2316 struct socket_wq *wq;
2317
2318 rcu_read_lock();
1da177e4
LT		 2319
2320 /* Do not wake up a writer until he can make "significant"
2321 * progress. --DaveM
2322 */
e71a4783 2323 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2324 wq = rcu_dereference(sk->sk_wq);
2325 if (wq_has_sleeper(wq))
2326 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2327 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2328
2329 /* Should agree with poll, otherwise some programs break */
2330 if (sock_writeable(sk))
8d8ad9d7 2331 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2332 }
2333
43815482 2334 rcu_read_unlock();
1da177e4
LT		 2335}
2336
2337static void sock_def_destruct(struct sock *sk)
2338{
1da177e4
LT		 2339}
2340
2341void sk_send_sigurg(struct sock *sk)
2342{
2343 if (sk->sk_socket && sk->sk_socket->file)
2344 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2345 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2346}
2a91525c 2347EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2348
2349void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2350 unsigned long expires)
2351{
2352 if (!mod_timer(timer, expires))
2353 sock_hold(sk);
2354}
1da177e4
LT		 2355EXPORT_SYMBOL(sk_reset_timer);
2356
2357void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2358{
25cc4ae9 2359 if (del_timer(timer))
1da177e4
LT		 2360 __sock_put(sk);
2361}
1da177e4
LT		 2362EXPORT_SYMBOL(sk_stop_timer);
2363
2364void sock_init_data(struct socket *sock, struct sock *sk)
2365{
2366 skb_queue_head_init(&sk->sk_receive_queue);
2367 skb_queue_head_init(&sk->sk_write_queue);
2368 skb_queue_head_init(&sk->sk_error_queue);
2369
2370 sk->sk_send_head = NULL;
2371
2372 init_timer(&sk->sk_timer);
4ec93edb 2373
1da177e4
LT		 2374 sk->sk_allocation = GFP_KERNEL;
2375 sk->sk_rcvbuf = sysctl_rmem_default;
2376 sk->sk_sndbuf = sysctl_wmem_default;
2377 sk->sk_state = TCP_CLOSE;
972692e0 2378 sk_set_socket(sk, sock);
1da177e4
LT		 2379
2380 sock_set_flag(sk, SOCK_ZAPPED);
2381
e71a4783 2382 if (sock) {
1da177e4 2383 sk->sk_type = sock->type;
43815482 2384 sk->sk_wq = sock->wq;
1da177e4
LT		 2385 sock->sk = sk;
2386 } else
43815482 2387 sk->sk_wq = NULL;
1da177e4 2388
1da177e4 2389 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2390 lockdep_set_class_and_name(&sk->sk_callback_lock,
2391 af_callback_keys + sk->sk_family,
2392 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2393
2394 sk->sk_state_change = sock_def_wakeup;
2395 sk->sk_data_ready = sock_def_readable;
2396 sk->sk_write_space = sock_def_write_space;
2397 sk->sk_error_report = sock_def_error_report;
2398 sk->sk_destruct = sock_def_destruct;
2399
5640f768
ED		 2400 sk->sk_frag.page = NULL;
2401 sk->sk_frag.offset = 0;
ef64a54f 2402 sk->sk_peek_off = -1;
1da177e4 2403
109f6e39
EB		 2404 sk->sk_peer_pid = NULL;
2405 sk->sk_peer_cred = NULL;
1da177e4
LT		 2406 sk->sk_write_pending = 0;
2407 sk->sk_rcvlowat = 1;
2408 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2409 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2410
f37f0afb 2411 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2412
e0d1095a 2413#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2414 sk->sk_napi_id = 0;
64b0dc51 2415 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2416#endif
2417
62748f32 2418 sk->sk_max_pacing_rate = ~0U;
7eec4174 2419 sk->sk_pacing_rate = ~0U;
70da268b 2420 sk->sk_incoming_cpu = -1;
4dc6dc71
ED		 2421 /*
2422 * Before updating sk_refcnt, we must commit prior changes to memory
2423 * (Documentation/RCU/rculist_nulls.txt for details)
2424 */
2425 smp_wmb();
1da177e4 2426 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2427 atomic_set(&sk->sk_drops, 0);
1da177e4 2428}
2a91525c 2429EXPORT_SYMBOL(sock_init_data);
1da177e4 2430
b5606c2d 2431void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2432{
2433 might_sleep();
a5b5bb9a 2434 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2435 if (sk->sk_lock.owned)
1da177e4 2436 __lock_sock(sk);
d2e9117c 2437 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2438 spin_unlock(&sk->sk_lock.slock);
2439 /*
2440 * The sk_lock has mutex_lock() semantics here:
2441 */
fcc70d5f 2442 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2443 local_bh_enable();
1da177e4 2444}
fcc70d5f 2445EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2446
b5606c2d 2447void release_sock(struct sock *sk)
1da177e4 2448{
a5b5bb9a
IM		 2449 /*
2450 * The sk_lock has mutex_unlock() semantics:
2451 */
2452 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2453
2454 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2455 if (sk->sk_backlog.tail)
2456 __release_sock(sk);
46d3ceab 2457
c3f9b018
ED		 2458 /* Warning : release_cb() might need to release sk ownership,
2459 * ie call sock_release_ownership(sk) before us.
2460 */
46d3ceab
ED		 2461 if (sk->sk_prot->release_cb)
2462 sk->sk_prot->release_cb(sk);
2463
c3f9b018 2464 sock_release_ownership(sk);
a5b5bb9a
IM		 2465 if (waitqueue_active(&sk->sk_lock.wq))
2466 wake_up(&sk->sk_lock.wq);
2467 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2468}
2469EXPORT_SYMBOL(release_sock);
2470
8a74ad60
ED		 2471/**
2472 * lock_sock_fast - fast version of lock_sock
2473 * @sk: socket
2474 *
2475 * This version should be used for very small section, where process wont block
2476 * return false if fast path is taken
2477 * sk_lock.slock locked, owned = 0, BH disabled
2478 * return true if slow path is taken
2479 * sk_lock.slock unlocked, owned = 1, BH enabled
2480 */
2481bool lock_sock_fast(struct sock *sk)
2482{
2483 might_sleep();
2484 spin_lock_bh(&sk->sk_lock.slock);
2485
2486 if (!sk->sk_lock.owned)
2487 /*
2488 * Note : We must disable BH
2489 */
2490 return false;
2491
2492 __lock_sock(sk);
2493 sk->sk_lock.owned = 1;
2494 spin_unlock(&sk->sk_lock.slock);
2495 /*
2496 * The sk_lock has mutex_lock() semantics here:
2497 */
2498 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2499 local_bh_enable();
2500 return true;
2501}
2502EXPORT_SYMBOL(lock_sock_fast);
2503
1da177e4 2504int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2505{
b7aa0bf7 2506 struct timeval tv;
1da177e4 2507 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2508 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2509 tv = ktime_to_timeval(sk->sk_stamp);
2510 if (tv.tv_sec == -1)
1da177e4 2511 return -ENOENT;
b7aa0bf7
ED		 2512 if (tv.tv_sec == 0) {
2513 sk->sk_stamp = ktime_get_real();
2514 tv = ktime_to_timeval(sk->sk_stamp);
2515 }
2516 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2517}
1da177e4
LT		 2518EXPORT_SYMBOL(sock_get_timestamp);
2519
ae40eb1e
ED		 2520int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2521{
2522 struct timespec ts;
2523 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2524 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2525 ts = ktime_to_timespec(sk->sk_stamp);
2526 if (ts.tv_sec == -1)
2527 return -ENOENT;
2528 if (ts.tv_sec == 0) {
2529 sk->sk_stamp = ktime_get_real();
2530 ts = ktime_to_timespec(sk->sk_stamp);
2531 }
2532 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2533}
2534EXPORT_SYMBOL(sock_get_timestampns);
2535
20d49473 2536void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2537{
20d49473 2538 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2539 unsigned long previous_flags = sk->sk_flags;
2540
20d49473
PO		 2541 sock_set_flag(sk, flag);
2542 /*
2543 * we just set one of the two flags which require net
2544 * time stamping, but time stamping might have been on
2545 * already because of the other one
2546 */
080a270f
HFS		 2547 if (sock_needs_netstamp(sk) &&
2548 !(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2549 net_enable_timestamp();
1da177e4
LT		 2550 }
2551}
1da177e4 2552
cb820f8e
RC		 2553int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2554 int level, int type)
2555{
2556 struct sock_exterr_skb *serr;
364a9e93 2557 struct sk_buff *skb;
cb820f8e
RC		 2558 int copied, err;
2559
2560 err = -EAGAIN;
364a9e93 2561 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 2562 if (skb == NULL)
2563 goto out;
2564
2565 copied = skb->len;
2566 if (copied > len) {
2567 msg->msg_flags |= MSG_TRUNC;
2568 copied = len;
2569 }
51f3d02b 2570 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 2571 if (err)
2572 goto out_free_skb;
2573
2574 sock_recv_timestamp(msg, sk, skb);
2575
2576 serr = SKB_EXT_ERR(skb);
2577 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2578
2579 msg->msg_flags |= MSG_ERRQUEUE;
2580 err = copied;
2581
cb820f8e
RC		 2582out_free_skb:
2583 kfree_skb(skb);
2584out:
2585 return err;
2586}
2587EXPORT_SYMBOL(sock_recv_errqueue);
2588
1da177e4
LT		 2589/*
2590 * Get a socket option on an socket.
2591 *
2592 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2593 * asynchronous errors should be reported by getsockopt. We assume
2594 * this means if you specify SO_ERROR (otherwise whats the point of it).
2595 */
2596int sock_common_getsockopt(struct socket *sock, int level, int optname,
2597 char __user *optval, int __user *optlen)
2598{
2599 struct sock *sk = sock->sk;
2600
2601 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2602}
1da177e4
LT		 2603EXPORT_SYMBOL(sock_common_getsockopt);
2604
3fdadf7d 2605#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2606int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2607 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2608{
2609 struct sock *sk = sock->sk;
2610
1e51f951 2611 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2612 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2613 optval, optlen);
3fdadf7d
DM		 2614 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2615}
2616EXPORT_SYMBOL(compat_sock_common_getsockopt);
2617#endif
2618
1b784140
YX		 2619int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2620 int flags)
1da177e4
LT		 2621{
2622 struct sock *sk = sock->sk;
2623 int addr_len = 0;
2624 int err;
2625
1b784140 2626 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
1da177e4
LT		 2627 flags & ~MSG_DONTWAIT, &addr_len);
2628 if (err >= 0)
2629 msg->msg_namelen = addr_len;
2630 return err;
2631}
1da177e4
LT		 2632EXPORT_SYMBOL(sock_common_recvmsg);
2633
2634/*
2635 * Set socket options on an inet socket.
2636 */
2637int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2638 char __user *optval, unsigned int optlen)
1da177e4
LT		 2639{
2640 struct sock *sk = sock->sk;
2641
2642 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2643}
1da177e4
LT		 2644EXPORT_SYMBOL(sock_common_setsockopt);
2645
3fdadf7d 2646#ifdef CONFIG_COMPAT
543d9cfe 2647int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2648 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2649{
2650 struct sock *sk = sock->sk;
2651
543d9cfe
ACM		 2652 if (sk->sk_prot->compat_setsockopt != NULL)
2653 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2654 optval, optlen);
3fdadf7d
DM		 2655 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2656}
2657EXPORT_SYMBOL(compat_sock_common_setsockopt);
2658#endif
2659
1da177e4
LT		 2660void sk_common_release(struct sock *sk)
2661{
2662 if (sk->sk_prot->destroy)
2663 sk->sk_prot->destroy(sk);
2664
2665 /*
2666 * Observation: when sock_common_release is called, processes have
2667 * no access to socket. But net still has.
2668 * Step one, detach it from networking:
2669 *
2670 * A. Remove from hash tables.
2671 */
2672
2673 sk->sk_prot->unhash(sk);
2674
2675 /*
2676 * In this point socket cannot receive new packets, but it is possible
2677 * that some packets are in flight because some CPU runs receiver and
2678 * did hash table lookup before we unhashed socket. They will achieve
2679 * receive queue and will be purged by socket destructor.
2680 *
2681 * Also we still have packets pending on receive queue and probably,
2682 * our own packets waiting in device queues. sock_destroy will drain
2683 * receive queue, but transmitted packets will delay socket destruction
2684 * until the last reference will be released.
2685 */
2686
2687 sock_orphan(sk);
2688
2689 xfrm_sk_free_policy(sk);
2690
e6848976 2691 sk_refcnt_debug_release(sk);
5640f768
ED		 2692
2693 if (sk->sk_frag.page) {
2694 put_page(sk->sk_frag.page);
2695 sk->sk_frag.page = NULL;
2696 }
2697
1da177e4
LT		 2698 sock_put(sk);
2699}
1da177e4
LT		 2700EXPORT_SYMBOL(sk_common_release);
2701
13ff3d6f
PE		 2702#ifdef CONFIG_PROC_FS
2703#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2704struct prot_inuse {
2705 int val[PROTO_INUSE_NR];
2706};
13ff3d6f
PE		 2707
2708static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2709
2710#ifdef CONFIG_NET_NS
2711void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2712{
d6d9ca0f 2713 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2714}
2715EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2716
2717int sock_prot_inuse_get(struct net *net, struct proto *prot)
2718{
2719 int cpu, idx = prot->inuse_idx;
2720 int res = 0;
2721
2722 for_each_possible_cpu(cpu)
2723 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2724
2725 return res >= 0 ? res : 0;
2726}
2727EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2728
2c8c1e72 2729static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2730{
2731 net->core.inuse = alloc_percpu(struct prot_inuse);
2732 return net->core.inuse ? 0 : -ENOMEM;
2733}
2734
2c8c1e72 2735static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2736{
2737 free_percpu(net->core.inuse);
2738}
2739
2740static struct pernet_operations net_inuse_ops = {
2741 .init = sock_inuse_init_net,
2742 .exit = sock_inuse_exit_net,
2743};
2744
2745static __init int net_inuse_init(void)
2746{
2747 if (register_pernet_subsys(&net_inuse_ops))
2748 panic("Cannot initialize net inuse counters");
2749
2750 return 0;
2751}
2752
2753core_initcall(net_inuse_init);
2754#else
1338d466
PE		 2755static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2756
c29a0bc4 2757void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2758{
d6d9ca0f 2759 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2760}
2761EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2762
c29a0bc4 2763int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2764{
2765 int cpu, idx = prot->inuse_idx;
2766 int res = 0;
2767
2768 for_each_possible_cpu(cpu)
2769 res += per_cpu(prot_inuse, cpu).val[idx];
2770
2771 return res >= 0 ? res : 0;
2772}
2773EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2774#endif
13ff3d6f
PE		 2775
2776static void assign_proto_idx(struct proto *prot)
2777{
2778 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2779
2780 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2781 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2782 return;
2783 }
2784
2785 set_bit(prot->inuse_idx, proto_inuse_idx);
2786}
2787
2788static void release_proto_idx(struct proto *prot)
2789{
2790 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2791 clear_bit(prot->inuse_idx, proto_inuse_idx);
2792}
2793#else
2794static inline void assign_proto_idx(struct proto *prot)
2795{
2796}
2797
2798static inline void release_proto_idx(struct proto *prot)
2799{
2800}
2801#endif
2802
0159dfd3
ED		 2803static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
2804{
2805 if (!rsk_prot)
2806 return;
2807 kfree(rsk_prot->slab_name);
2808 rsk_prot->slab_name = NULL;
adf78eda
JL		 2809 kmem_cache_destroy(rsk_prot->slab);
2810 rsk_prot->slab = NULL;
0159dfd3
ED		 2811}
2812
2813static int req_prot_init(const struct proto *prot)
2814{
2815 struct request_sock_ops *rsk_prot = prot->rsk_prot;
2816
2817 if (!rsk_prot)
2818 return 0;
2819
2820 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
2821 prot->name);
2822 if (!rsk_prot->slab_name)
2823 return -ENOMEM;
2824
2825 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
2826 rsk_prot->obj_size, 0,
e96f78ab 2827 prot->slab_flags, NULL);
0159dfd3
ED		 2828
2829 if (!rsk_prot->slab) {
2830 pr_crit("%s: Can't create request sock SLAB cache!\n",
2831 prot->name);
2832 return -ENOMEM;
2833 }
2834 return 0;
2835}
2836
b733c007
PE		 2837int proto_register(struct proto *prot, int alloc_slab)
2838{
1da177e4
LT		 2839 if (alloc_slab) {
2840 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2841 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2842 NULL);
1da177e4
LT		 2843
2844 if (prot->slab == NULL) {
e005d193
JP		 2845 pr_crit("%s: Can't create sock SLAB cache!\n",
2846 prot->name);
60e7663d 2847 goto out;
1da177e4 2848 }
2e6599cb 2849
0159dfd3
ED		 2850 if (req_prot_init(prot))
2851 goto out_free_request_sock_slab;
8feaf0c0 2852
6d6ee43e 2853 if (prot->twsk_prot != NULL) {
faf23422 2854 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2855
7e56b5d6 2856 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2857 goto out_free_request_sock_slab;
2858
6d6ee43e 2859 prot->twsk_prot->twsk_slab =
7e56b5d6 2860 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2861 prot->twsk_prot->twsk_obj_size,
3ab5aee7 2862 0,
52db70dc 2863 prot->slab_flags,
20c2df83 2864 NULL);
6d6ee43e 2865 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2866 goto out_free_timewait_sock_slab_name;
2867 }
1da177e4
LT		 2868 }
2869
36b77a52 2870 mutex_lock(&proto_list_mutex);
1da177e4 2871 list_add(&prot->node, &proto_list);
13ff3d6f 2872 assign_proto_idx(prot);
36b77a52 2873 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2874 return 0;
2875
8feaf0c0 2876out_free_timewait_sock_slab_name:
7e56b5d6 2877 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0 2878out_free_request_sock_slab:
0159dfd3
ED		 2879 req_prot_cleanup(prot->rsk_prot);
2880
2e6599cb
ACM		 2881 kmem_cache_destroy(prot->slab);
2882 prot->slab = NULL;
b733c007
PE		 2883out:
2884 return -ENOBUFS;
1da177e4 2885}
1da177e4
LT		 2886EXPORT_SYMBOL(proto_register);
2887
2888void proto_unregister(struct proto *prot)
2889{
36b77a52 2890 mutex_lock(&proto_list_mutex);
13ff3d6f 2891 release_proto_idx(prot);
0a3f4358 2892 list_del(&prot->node);
36b77a52 2893 mutex_unlock(&proto_list_mutex);
1da177e4 2894
adf78eda
JL		 2895 kmem_cache_destroy(prot->slab);
2896 prot->slab = NULL;
1da177e4 2897
0159dfd3 2898 req_prot_cleanup(prot->rsk_prot);
2e6599cb 2899
6d6ee43e 2900 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2901 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2902 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2903 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2904 }
1da177e4 2905}
1da177e4
LT		 2906EXPORT_SYMBOL(proto_unregister);
2907
2908#ifdef CONFIG_PROC_FS
1da177e4 2909static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2910 __acquires(proto_list_mutex)
1da177e4 2911{
36b77a52 2912 mutex_lock(&proto_list_mutex);
60f0438a 2913 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2914}
2915
2916static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2917{
60f0438a 2918 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2919}
2920
2921static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2922 __releases(proto_list_mutex)
1da177e4 2923{
36b77a52 2924 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2925}
2926
2927static char proto_method_implemented(const void *method)
2928{
2929 return method == NULL ? 'n' : 'y';
2930}
180d8cd9
GC		 2931static long sock_prot_memory_allocated(struct proto *proto)
2932{
cb75a36c 2933 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2934}
2935
2936static char *sock_prot_memory_pressure(struct proto *proto)
2937{
2938 return proto->memory_pressure != NULL ?
2939 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2940}
1da177e4
LT		 2941
2942static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2943{
180d8cd9 2944
8d987e5c 2945 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2946 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2947 proto->name,
2948 proto->obj_size,
14e943db 2949 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2950 sock_prot_memory_allocated(proto),
2951 sock_prot_memory_pressure(proto),
1da177e4
LT		 2952 proto->max_header,
2953 proto->slab == NULL ? "no" : "yes",
2954 module_name(proto->owner),
2955 proto_method_implemented(proto->close),
2956 proto_method_implemented(proto->connect),
2957 proto_method_implemented(proto->disconnect),
2958 proto_method_implemented(proto->accept),
2959 proto_method_implemented(proto->ioctl),
2960 proto_method_implemented(proto->init),
2961 proto_method_implemented(proto->destroy),
2962 proto_method_implemented(proto->shutdown),
2963 proto_method_implemented(proto->setsockopt),
2964 proto_method_implemented(proto->getsockopt),
2965 proto_method_implemented(proto->sendmsg),
2966 proto_method_implemented(proto->recvmsg),
2967 proto_method_implemented(proto->sendpage),
2968 proto_method_implemented(proto->bind),
2969 proto_method_implemented(proto->backlog_rcv),
2970 proto_method_implemented(proto->hash),
2971 proto_method_implemented(proto->unhash),
2972 proto_method_implemented(proto->get_port),
2973 proto_method_implemented(proto->enter_memory_pressure));
2974}
2975
2976static int proto_seq_show(struct seq_file *seq, void *v)
2977{
60f0438a 2978 if (v == &proto_list)
1da177e4
LT		 2979 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2980 "protocol",
2981 "size",
2982 "sockets",
2983 "memory",
2984 "press",
2985 "maxhdr",
2986 "slab",
2987 "module",
2988 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2989 else
60f0438a 2990 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2991 return 0;
2992}
2993
f690808e 2994static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2995 .start = proto_seq_start,
2996 .next = proto_seq_next,
2997 .stop = proto_seq_stop,
2998 .show = proto_seq_show,
2999};
3000
3001static int proto_seq_open(struct inode *inode, struct file *file)
3002{
14e943db
ED		 3003 return seq_open_net(inode, file, &proto_seq_ops,
3004 sizeof(struct seq_net_private));
1da177e4
LT		 3005}
3006
9a32144e 3007static const struct file_operations proto_seq_fops = {
1da177e4
LT		 3008 .owner = THIS_MODULE,
3009 .open = proto_seq_open,
3010 .read = seq_read,
3011 .llseek = seq_lseek,
14e943db
ED		 3012 .release = seq_release_net,
3013};
3014
3015static __net_init int proto_init_net(struct net *net)
3016{
d4beaa66 3017 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 3018 return -ENOMEM;
3019
3020 return 0;
3021}
3022
3023static __net_exit void proto_exit_net(struct net *net)
3024{
ece31ffd 3025 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 3026}
3027
3028
3029static __net_initdata struct pernet_operations proto_net_ops = {
3030 .init = proto_init_net,
3031 .exit = proto_exit_net,
1da177e4
LT		 3032};
3033
3034static int __init proto_init(void)
3035{
14e943db 3036 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 3037}
3038
3039subsys_initcall(proto_init);
3040
3041#endif /* PROC_FS */
Linux kernel - Deliverables
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