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net: tcp_memcontrol: sanitize tcp memory accounting callbacks
[deliverable/linux.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
4ec93edb 35 * code. The ACK stuff can wait and needs major
1da177e4
LT		 36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 *
85 *
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
90 */
91
e005d193
JP		 92#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
93
4fc268d2 94#include <linux/capability.h>
1da177e4 95#include <linux/errno.h>
cb820f8e 96#include <linux/errqueue.h>
1da177e4
LT		 97#include <linux/types.h>
98#include <linux/socket.h>
99#include <linux/in.h>
100#include <linux/kernel.h>
1da177e4
LT		 101#include <linux/module.h>
102#include <linux/proc_fs.h>
103#include <linux/seq_file.h>
104#include <linux/sched.h>
105#include <linux/timer.h>
106#include <linux/string.h>
107#include <linux/sockios.h>
108#include <linux/net.h>
109#include <linux/mm.h>
110#include <linux/slab.h>
111#include <linux/interrupt.h>
112#include <linux/poll.h>
113#include <linux/tcp.h>
114#include <linux/init.h>
a1f8e7f7 115#include <linux/highmem.h>
3f551f94 116#include <linux/user_namespace.h>
c5905afb 117#include <linux/static_key.h>
3969eb38 118#include <linux/memcontrol.h>
8c1ae10d 119#include <linux/prefetch.h>
1da177e4
LT		 120
121#include <asm/uaccess.h>
1da177e4
LT		 122
123#include <linux/netdevice.h>
124#include <net/protocol.h>
125#include <linux/skbuff.h>
457c4cbc 126#include <net/net_namespace.h>
2e6599cb 127#include <net/request_sock.h>
1da177e4 128#include <net/sock.h>
20d49473 129#include <linux/net_tstamp.h>
1da177e4
LT		 130#include <net/xfrm.h>
131#include <linux/ipsec.h>
f8451725 132#include <net/cls_cgroup.h>
5bc1421e 133#include <net/netprio_cgroup.h>
eb4cb008 134#include <linux/sock_diag.h>
1da177e4
LT		 135
136#include <linux/filter.h>
538950a1 137#include <net/sock_reuseport.h>
1da177e4 138
3847ce32
SM		 139#include <trace/events/sock.h>
140
1da177e4
LT		 141#ifdef CONFIG_INET
142#include <net/tcp.h>
143#endif
144
076bb0c8 145#include <net/busy_poll.h>
06021292 146
36b77a52 147static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 148static LIST_HEAD(proto_list);
149
a3b299da
EB		 150/**
151 * sk_ns_capable - General socket capability test
152 * @sk: Socket to use a capability on or through
153 * @user_ns: The user namespace of the capability to use
154 * @cap: The capability to use
155 *
156 * Test to see if the opener of the socket had when the socket was
157 * created and the current process has the capability @cap in the user
158 * namespace @user_ns.
159 */
160bool sk_ns_capable(const struct sock *sk,
161 struct user_namespace *user_ns, int cap)
162{
163 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
164 ns_capable(user_ns, cap);
165}
166EXPORT_SYMBOL(sk_ns_capable);
167
168/**
169 * sk_capable - Socket global capability test
170 * @sk: Socket to use a capability on or through
e793c0f7 171 * @cap: The global capability to use
a3b299da
EB		 172 *
173 * Test to see if the opener of the socket had when the socket was
174 * created and the current process has the capability @cap in all user
175 * namespaces.
176 */
177bool sk_capable(const struct sock *sk, int cap)
178{
179 return sk_ns_capable(sk, &init_user_ns, cap);
180}
181EXPORT_SYMBOL(sk_capable);
182
183/**
184 * sk_net_capable - Network namespace socket capability test
185 * @sk: Socket to use a capability on or through
186 * @cap: The capability to use
187 *
e793c0f7 188 * Test to see if the opener of the socket had when the socket was created
a3b299da
EB		 189 * and the current process has the capability @cap over the network namespace
190 * the socket is a member of.
191 */
192bool sk_net_capable(const struct sock *sk, int cap)
193{
194 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
195}
196EXPORT_SYMBOL(sk_net_capable);
197
198
c255a458 199#ifdef CONFIG_MEMCG_KMEM
1d62e436 200int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
d1a4c0b3
GC		 201{
202 struct proto *proto;
203 int ret = 0;
204
36b77a52 205 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 206 list_for_each_entry(proto, &proto_list, node) {
207 if (proto->init_cgroup) {
1d62e436 208 ret = proto->init_cgroup(memcg, ss);
d1a4c0b3
GC		 209 if (ret)
210 goto out;
211 }
212 }
213
36b77a52 214 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 215 return ret;
216out:
217 list_for_each_entry_continue_reverse(proto, &proto_list, node)
218 if (proto->destroy_cgroup)
1d62e436 219 proto->destroy_cgroup(memcg);
36b77a52 220 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 221 return ret;
222}
223
1d62e436 224void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
d1a4c0b3
GC		 225{
226 struct proto *proto;
227
36b77a52 228 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 229 list_for_each_entry_reverse(proto, &proto_list, node)
230 if (proto->destroy_cgroup)
1d62e436 231 proto->destroy_cgroup(memcg);
36b77a52 232 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 233}
234#endif
235
da21f24d
IM		 236/*
237 * Each address family might have different locking rules, so we have
238 * one slock key per address family:
239 */
a5b5bb9a
IM		 240static struct lock_class_key af_family_keys[AF_MAX];
241static struct lock_class_key af_family_slock_keys[AF_MAX];
242
cbda4eaf 243#if defined(CONFIG_MEMCG_KMEM)
c5905afb 244struct static_key memcg_socket_limit_enabled;
e1aab161 245EXPORT_SYMBOL(memcg_socket_limit_enabled);
cbda4eaf 246#endif
e1aab161 247
a5b5bb9a
IM		 248/*
249 * Make lock validator output more readable. (we pre-construct these
250 * strings build-time, so that runtime initialization of socket
251 * locks is fast):
252 */
36cbd3dc 253static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 254 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
255 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
256 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
257 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
258 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
259 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
260 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 261 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 262 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 263 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 264 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 265 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 266 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
456db6a4 267 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX"
a5b5bb9a 268};
36cbd3dc 269static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 270 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
271 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
272 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
273 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
274 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
275 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
276 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 277 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 278 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 279 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 280 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 281 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 282 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
456db6a4 283 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX"
a5b5bb9a 284};
36cbd3dc 285static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 286 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
287 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
288 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
289 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
290 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
291 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
292 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 293 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 294 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 295 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 296 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 297 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 298 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
456db6a4 299 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX"
443aef0e 300};
da21f24d
IM		 301
302/*
303 * sk_callback_lock locking rules are per-address-family,
304 * so split the lock classes by using a per-AF key:
305 */
306static struct lock_class_key af_callback_keys[AF_MAX];
307
1da177e4
LT		 308/* Take into consideration the size of the struct sk_buff overhead in the
309 * determination of these values, since that is non-constant across
310 * platforms. This makes socket queueing behavior and performance
311 * not depend upon such differences.
312 */
313#define _SK_MEM_PACKETS 256
87fb4b7b 314#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 315#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
316#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
317
318/* Run time adjustable parameters. */
ab32ea5d 319__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 320EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 321__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 322EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 323__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
324__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 325
25985edc 326/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 327int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 328EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 329
b245be1f
WB		 330int sysctl_tstamp_allow_data __read_mostly = 1;
331
c93bdd0e
MG		 332struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
333EXPORT_SYMBOL_GPL(memalloc_socks);
334
7cb02404
MG		 335/**
336 * sk_set_memalloc - sets %SOCK_MEMALLOC
337 * @sk: socket to set it on
338 *
339 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
340 * It's the responsibility of the admin to adjust min_free_kbytes
341 * to meet the requirements
342 */
343void sk_set_memalloc(struct sock *sk)
344{
345 sock_set_flag(sk, SOCK_MEMALLOC);
346 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 347 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 348}
349EXPORT_SYMBOL_GPL(sk_set_memalloc);
350
351void sk_clear_memalloc(struct sock *sk)
352{
353 sock_reset_flag(sk, SOCK_MEMALLOC);
354 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 355 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 356
357 /*
358 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
5d753610
MG		 359 * progress of swapping. SOCK_MEMALLOC may be cleared while
360 * it has rmem allocations due to the last swapfile being deactivated
361 * but there is a risk that the socket is unusable due to exceeding
362 * the rmem limits. Reclaim the reserves and obey rmem limits again.
c76562b6 363 */
5d753610 364 sk_mem_reclaim(sk);
7cb02404
MG		 365}
366EXPORT_SYMBOL_GPL(sk_clear_memalloc);
367
b4b9e355
MG		 368int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
369{
370 int ret;
371 unsigned long pflags = current->flags;
372
373 /* these should have been dropped before queueing */
374 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
375
376 current->flags |= PF_MEMALLOC;
377 ret = sk->sk_backlog_rcv(sk, skb);
378 tsk_restore_flags(current, pflags, PF_MEMALLOC);
379
380 return ret;
381}
382EXPORT_SYMBOL(__sk_backlog_rcv);
383
1da177e4
LT		 384static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
385{
386 struct timeval tv;
387
388 if (optlen < sizeof(tv))
389 return -EINVAL;
390 if (copy_from_user(&tv, optval, sizeof(tv)))
391 return -EFAULT;
ba78073e
VA		 392 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
393 return -EDOM;
1da177e4 394
ba78073e 395 if (tv.tv_sec < 0) {
6f11df83
AM		 396 static int warned __read_mostly;
397
ba78073e 398 *timeo_p = 0;
50aab54f 399 if (warned < 10 && net_ratelimit()) {
ba78073e 400 warned++;
e005d193
JP		 401 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
402 __func__, current->comm, task_pid_nr(current));
50aab54f 403 }
ba78073e
VA		 404 return 0;
405 }
1da177e4
LT		 406 *timeo_p = MAX_SCHEDULE_TIMEOUT;
407 if (tv.tv_sec == 0 && tv.tv_usec == 0)
408 return 0;
409 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
410 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
411 return 0;
412}
413
414static void sock_warn_obsolete_bsdism(const char *name)
415{
416 static int warned;
417 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 418 if (strcmp(warncomm, current->comm) && warned < 5) {
419 strcpy(warncomm, current->comm);
e005d193
JP		 420 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
421 warncomm, name);
1da177e4
LT		 422 warned++;
423 }
424}
425
080a270f
HFS		 426static bool sock_needs_netstamp(const struct sock *sk)
427{
428 switch (sk->sk_family) {
429 case AF_UNSPEC:
430 case AF_UNIX:
431 return false;
432 default:
433 return true;
434 }
435}
436
08e29af3 437static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 438{
08e29af3
ED		 439 if (sk->sk_flags & flags) {
440 sk->sk_flags &= ~flags;
080a270f
HFS		 441 if (sock_needs_netstamp(sk) &&
442 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 443 net_disable_timestamp();
1da177e4
LT		 444 }
445}
446
447
f0088a50
DV		 448int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
449{
766e9037 450 int err;
3b885787
NH		 451 unsigned long flags;
452 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 453
0fd7bac6 454 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 455 atomic_inc(&sk->sk_drops);
3847ce32 456 trace_sock_rcvqueue_full(sk, skb);
766e9037 457 return -ENOMEM;
f0088a50
DV		 458 }
459
fda9ef5d 460 err = sk_filter(sk, skb);
f0088a50 461 if (err)
766e9037 462 return err;
f0088a50 463
c76562b6 464 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 465 atomic_inc(&sk->sk_drops);
466 return -ENOBUFS;
3ab224be
HA		 467 }
468
f0088a50
DV		 469 skb->dev = NULL;
470 skb_set_owner_r(skb, sk);
49ad9599 471
7fee226a
ED		 472 /* we escape from rcu protected region, make sure we dont leak
473 * a norefcounted dst
474 */
475 skb_dst_force(skb);
476
3b885787 477 spin_lock_irqsave(&list->lock, flags);
3bc3b96f 478 sock_skb_set_dropcount(sk, skb);
3b885787
NH		 479 __skb_queue_tail(list, skb);
480 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 481
482 if (!sock_flag(sk, SOCK_DEAD))
676d2369 483 sk->sk_data_ready(sk);
766e9037 484 return 0;
f0088a50
DV		 485}
486EXPORT_SYMBOL(sock_queue_rcv_skb);
487
58a5a7b9 488int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 489{
490 int rc = NET_RX_SUCCESS;
491
fda9ef5d 492 if (sk_filter(sk, skb))
f0088a50
DV		 493 goto discard_and_relse;
494
495 skb->dev = NULL;
496
274f482d 497 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 498 atomic_inc(&sk->sk_drops);
499 goto discard_and_relse;
500 }
58a5a7b9
ACM		 501 if (nested)
502 bh_lock_sock_nested(sk);
503 else
504 bh_lock_sock(sk);
a5b5bb9a
IM		 505 if (!sock_owned_by_user(sk)) {
506 /*
507 * trylock + unlock semantics:
508 */
509 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
510
c57943a1 511 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 512
513 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 514 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 515 bh_unlock_sock(sk);
516 atomic_inc(&sk->sk_drops);
517 goto discard_and_relse;
518 }
519
f0088a50
DV		 520 bh_unlock_sock(sk);
521out:
522 sock_put(sk);
523 return rc;
524discard_and_relse:
525 kfree_skb(skb);
526 goto out;
527}
528EXPORT_SYMBOL(sk_receive_skb);
529
530struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
531{
b6c6712a 532 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 533
534 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 535 sk_tx_queue_clear(sk);
a9b3cd7f 536 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 537 dst_release(dst);
538 return NULL;
539 }
540
541 return dst;
542}
543EXPORT_SYMBOL(__sk_dst_check);
544
545struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
546{
547 struct dst_entry *dst = sk_dst_get(sk);
548
549 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
550 sk_dst_reset(sk);
551 dst_release(dst);
552 return NULL;
553 }
554
555 return dst;
556}
557EXPORT_SYMBOL(sk_dst_check);
558
c91f6df2
BH		 559static int sock_setbindtodevice(struct sock *sk, char __user *optval,
560 int optlen)
4878809f
DM		 561{
562 int ret = -ENOPROTOOPT;
563#ifdef CONFIG_NETDEVICES
3b1e0a65 564 struct net *net = sock_net(sk);
4878809f
DM		 565 char devname[IFNAMSIZ];
566 int index;
567
568 /* Sorry... */
569 ret = -EPERM;
5e1fccc0 570 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 571 goto out;
572
573 ret = -EINVAL;
574 if (optlen < 0)
575 goto out;
576
577 /* Bind this socket to a particular device like "eth0",
578 * as specified in the passed interface name. If the
579 * name is "" or the option length is zero the socket
580 * is not bound.
581 */
582 if (optlen > IFNAMSIZ - 1)
583 optlen = IFNAMSIZ - 1;
584 memset(devname, 0, sizeof(devname));
585
586 ret = -EFAULT;
587 if (copy_from_user(devname, optval, optlen))
588 goto out;
589
000ba2e4
DM		 590 index = 0;
591 if (devname[0] != '\0') {
bf8e56bf 592 struct net_device *dev;
4878809f 593
bf8e56bf
ED		 594 rcu_read_lock();
595 dev = dev_get_by_name_rcu(net, devname);
596 if (dev)
597 index = dev->ifindex;
598 rcu_read_unlock();
4878809f
DM		 599 ret = -ENODEV;
600 if (!dev)
601 goto out;
4878809f
DM		 602 }
603
604 lock_sock(sk);
605 sk->sk_bound_dev_if = index;
606 sk_dst_reset(sk);
607 release_sock(sk);
608
609 ret = 0;
610
611out:
612#endif
613
614 return ret;
615}
616
c91f6df2
BH		 617static int sock_getbindtodevice(struct sock *sk, char __user *optval,
618 int __user *optlen, int len)
619{
620 int ret = -ENOPROTOOPT;
621#ifdef CONFIG_NETDEVICES
622 struct net *net = sock_net(sk);
c91f6df2 623 char devname[IFNAMSIZ];
c91f6df2
BH		 624
625 if (sk->sk_bound_dev_if == 0) {
626 len = 0;
627 goto zero;
628 }
629
630 ret = -EINVAL;
631 if (len < IFNAMSIZ)
632 goto out;
633
5dbe7c17
NS		 634 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
635 if (ret)
c91f6df2 636 goto out;
c91f6df2
BH		 637
638 len = strlen(devname) + 1;
639
640 ret = -EFAULT;
641 if (copy_to_user(optval, devname, len))
642 goto out;
643
644zero:
645 ret = -EFAULT;
646 if (put_user(len, optlen))
647 goto out;
648
649 ret = 0;
650
651out:
652#endif
653
654 return ret;
655}
656
c0ef877b
PE		 657static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
658{
659 if (valbool)
660 sock_set_flag(sk, bit);
661 else
662 sock_reset_flag(sk, bit);
663}
664
f60e5990 665bool sk_mc_loop(struct sock *sk)
666{
667 if (dev_recursion_level())
668 return false;
669 if (!sk)
670 return true;
671 switch (sk->sk_family) {
672 case AF_INET:
673 return inet_sk(sk)->mc_loop;
674#if IS_ENABLED(CONFIG_IPV6)
675 case AF_INET6:
676 return inet6_sk(sk)->mc_loop;
677#endif
678 }
679 WARN_ON(1);
680 return true;
681}
682EXPORT_SYMBOL(sk_mc_loop);
683
1da177e4
LT		 684/*
685 * This is meant for all protocols to use and covers goings on
686 * at the socket level. Everything here is generic.
687 */
688
689int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 690 char __user *optval, unsigned int optlen)
1da177e4 691{
2a91525c 692 struct sock *sk = sock->sk;
1da177e4
LT		 693 int val;
694 int valbool;
695 struct linger ling;
696 int ret = 0;
4ec93edb 697
1da177e4
LT		 698 /*
699 * Options without arguments
700 */
701
4878809f 702 if (optname == SO_BINDTODEVICE)
c91f6df2 703 return sock_setbindtodevice(sk, optval, optlen);
4878809f 704
e71a4783
SH		 705 if (optlen < sizeof(int))
706 return -EINVAL;
4ec93edb 707
1da177e4
LT		 708 if (get_user(val, (int __user *)optval))
709 return -EFAULT;
4ec93edb 710
2a91525c 711 valbool = val ? 1 : 0;
1da177e4
LT		 712
713 lock_sock(sk);
714
2a91525c 715 switch (optname) {
e71a4783 716 case SO_DEBUG:
2a91525c 717 if (val && !capable(CAP_NET_ADMIN))
e71a4783 718 ret = -EACCES;
2a91525c 719 else
c0ef877b 720 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 721 break;
722 case SO_REUSEADDR:
4a17fd52 723 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 724 break;
055dc21a
TH		 725 case SO_REUSEPORT:
726 sk->sk_reuseport = valbool;
727 break;
e71a4783 728 case SO_TYPE:
49c794e9 729 case SO_PROTOCOL:
0d6038ee 730 case SO_DOMAIN:
e71a4783
SH		 731 case SO_ERROR:
732 ret = -ENOPROTOOPT;
733 break;
734 case SO_DONTROUTE:
c0ef877b 735 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 736 break;
737 case SO_BROADCAST:
738 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
739 break;
740 case SO_SNDBUF:
741 /* Don't error on this BSD doesn't and if you think
82981930
ED		 742 * about it this is right. Otherwise apps have to
743 * play 'guess the biggest size' games. RCVBUF/SNDBUF
744 * are treated in BSD as hints
745 */
746 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 747set_sndbuf:
e71a4783 748 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 749 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
750 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 751 sk->sk_write_space(sk);
752 break;
1da177e4 753
e71a4783
SH		 754 case SO_SNDBUFFORCE:
755 if (!capable(CAP_NET_ADMIN)) {
756 ret = -EPERM;
757 break;
758 }
759 goto set_sndbuf;
b0573dea 760
e71a4783
SH		 761 case SO_RCVBUF:
762 /* Don't error on this BSD doesn't and if you think
82981930
ED		 763 * about it this is right. Otherwise apps have to
764 * play 'guess the biggest size' games. RCVBUF/SNDBUF
765 * are treated in BSD as hints
766 */
767 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 768set_rcvbuf:
e71a4783
SH		 769 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
770 /*
771 * We double it on the way in to account for
772 * "struct sk_buff" etc. overhead. Applications
773 * assume that the SO_RCVBUF setting they make will
774 * allow that much actual data to be received on that
775 * socket.
776 *
777 * Applications are unaware that "struct sk_buff" and
778 * other overheads allocate from the receive buffer
779 * during socket buffer allocation.
780 *
781 * And after considering the possible alternatives,
782 * returning the value we actually used in getsockopt
783 * is the most desirable behavior.
784 */
82981930 785 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 786 break;
787
788 case SO_RCVBUFFORCE:
789 if (!capable(CAP_NET_ADMIN)) {
790 ret = -EPERM;
1da177e4 791 break;
e71a4783
SH		 792 }
793 goto set_rcvbuf;
1da177e4 794
e71a4783 795 case SO_KEEPALIVE:
1da177e4 796#ifdef CONFIG_INET
3e10986d
ED		 797 if (sk->sk_protocol == IPPROTO_TCP &&
798 sk->sk_type == SOCK_STREAM)
e71a4783 799 tcp_set_keepalive(sk, valbool);
1da177e4 800#endif
e71a4783
SH		 801 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
802 break;
803
804 case SO_OOBINLINE:
805 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
806 break;
807
808 case SO_NO_CHECK:
28448b80 809 sk->sk_no_check_tx = valbool;
e71a4783
SH		 810 break;
811
812 case SO_PRIORITY:
5e1fccc0
EB		 813 if ((val >= 0 && val <= 6) ||
814 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 815 sk->sk_priority = val;
816 else
817 ret = -EPERM;
818 break;
819
820 case SO_LINGER:
821 if (optlen < sizeof(ling)) {
822 ret = -EINVAL; /* 1003.1g */
1da177e4 823 break;
e71a4783 824 }
2a91525c 825 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 826 ret = -EFAULT;
1da177e4 827 break;
e71a4783
SH		 828 }
829 if (!ling.l_onoff)
830 sock_reset_flag(sk, SOCK_LINGER);
831 else {
1da177e4 832#if (BITS_PER_LONG == 32)
e71a4783
SH		 833 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
834 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 835 else
e71a4783
SH		 836#endif
837 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
838 sock_set_flag(sk, SOCK_LINGER);
839 }
840 break;
841
842 case SO_BSDCOMPAT:
843 sock_warn_obsolete_bsdism("setsockopt");
844 break;
845
846 case SO_PASSCRED:
847 if (valbool)
848 set_bit(SOCK_PASSCRED, &sock->flags);
849 else
850 clear_bit(SOCK_PASSCRED, &sock->flags);
851 break;
852
853 case SO_TIMESTAMP:
92f37fd2 854 case SO_TIMESTAMPNS:
e71a4783 855 if (valbool) {
92f37fd2
ED		 856 if (optname == SO_TIMESTAMP)
857 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
858 else
859 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 860 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 861 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 862 } else {
e71a4783 863 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 864 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
865 }
e71a4783
SH		 866 break;
867
20d49473
PO		 868 case SO_TIMESTAMPING:
869 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 870 ret = -EINVAL;
20d49473
PO		 871 break;
872 }
b245be1f 873
09c2d251 874 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765 875 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
ac5cc977
WC		 876 if (sk->sk_protocol == IPPROTO_TCP &&
877 sk->sk_type == SOCK_STREAM) {
4ed2d765
WB		 878 if (sk->sk_state != TCP_ESTABLISHED) {
879 ret = -EINVAL;
880 break;
881 }
882 sk->sk_tskey = tcp_sk(sk)->snd_una;
883 } else {
884 sk->sk_tskey = 0;
885 }
886 }
b9f40e21 887 sk->sk_tsflags = val;
20d49473
PO		 888 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
889 sock_enable_timestamp(sk,
890 SOCK_TIMESTAMPING_RX_SOFTWARE);
891 else
892 sock_disable_timestamp(sk,
08e29af3 893 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 894 break;
895
e71a4783
SH		 896 case SO_RCVLOWAT:
897 if (val < 0)
898 val = INT_MAX;
899 sk->sk_rcvlowat = val ? : 1;
900 break;
901
902 case SO_RCVTIMEO:
903 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
904 break;
905
906 case SO_SNDTIMEO:
907 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
908 break;
1da177e4 909
e71a4783
SH		 910 case SO_ATTACH_FILTER:
911 ret = -EINVAL;
912 if (optlen == sizeof(struct sock_fprog)) {
913 struct sock_fprog fprog;
1da177e4 914
e71a4783
SH		 915 ret = -EFAULT;
916 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 917 break;
e71a4783
SH		 918
919 ret = sk_attach_filter(&fprog, sk);
920 }
921 break;
922
89aa0758
AS		 923 case SO_ATTACH_BPF:
924 ret = -EINVAL;
925 if (optlen == sizeof(u32)) {
926 u32 ufd;
927
928 ret = -EFAULT;
929 if (copy_from_user(&ufd, optval, sizeof(ufd)))
930 break;
931
932 ret = sk_attach_bpf(ufd, sk);
933 }
934 break;
935
538950a1
CG		 936 case SO_ATTACH_REUSEPORT_CBPF:
937 ret = -EINVAL;
938 if (optlen == sizeof(struct sock_fprog)) {
939 struct sock_fprog fprog;
940
941 ret = -EFAULT;
942 if (copy_from_user(&fprog, optval, sizeof(fprog)))
943 break;
944
945 ret = sk_reuseport_attach_filter(&fprog, sk);
946 }
947 break;
948
949 case SO_ATTACH_REUSEPORT_EBPF:
950 ret = -EINVAL;
951 if (optlen == sizeof(u32)) {
952 u32 ufd;
953
954 ret = -EFAULT;
955 if (copy_from_user(&ufd, optval, sizeof(ufd)))
956 break;
957
958 ret = sk_reuseport_attach_bpf(ufd, sk);
959 }
960 break;
961
e71a4783 962 case SO_DETACH_FILTER:
55b33325 963 ret = sk_detach_filter(sk);
e71a4783 964 break;
1da177e4 965
d59577b6
VB		 966 case SO_LOCK_FILTER:
967 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
968 ret = -EPERM;
969 else
970 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
971 break;
972
e71a4783
SH		 973 case SO_PASSSEC:
974 if (valbool)
975 set_bit(SOCK_PASSSEC, &sock->flags);
976 else
977 clear_bit(SOCK_PASSSEC, &sock->flags);
978 break;
4a19ec58 979 case SO_MARK:
5e1fccc0 980 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 981 ret = -EPERM;
2a91525c 982 else
4a19ec58 983 sk->sk_mark = val;
4a19ec58 984 break;
877ce7c1 985
3b885787 986 case SO_RXQ_OVFL:
8083f0fc 987 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 988 break;
6e3e939f
JB		 989
990 case SO_WIFI_STATUS:
991 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
992 break;
993
ef64a54f
PE		 994 case SO_PEEK_OFF:
995 if (sock->ops->set_peek_off)
12663bfc 996 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 997 else
998 ret = -EOPNOTSUPP;
999 break;
3bdc0eba
BG		 1000
1001 case SO_NOFCS:
1002 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
1003 break;
1004
7d4c04fc
KJ		 1005 case SO_SELECT_ERR_QUEUE:
1006 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
1007 break;
1008
e0d1095a 1009#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1010 case SO_BUSY_POLL:
dafcc438
ET		 1011 /* allow unprivileged users to decrease the value */
1012 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
1013 ret = -EPERM;
1014 else {
1015 if (val < 0)
1016 ret = -EINVAL;
1017 else
1018 sk->sk_ll_usec = val;
1019 }
1020 break;
1021#endif
62748f32
ED		 1022
1023 case SO_MAX_PACING_RATE:
1024 sk->sk_max_pacing_rate = val;
1025 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
1026 sk->sk_max_pacing_rate);
1027 break;
1028
70da268b
ED		 1029 case SO_INCOMING_CPU:
1030 sk->sk_incoming_cpu = val;
1031 break;
1032
e71a4783
SH		 1033 default:
1034 ret = -ENOPROTOOPT;
1035 break;
4ec93edb 1036 }
1da177e4
LT		 1037 release_sock(sk);
1038 return ret;
1039}
2a91525c 1040EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 1041
1042
8f09898b 1043static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1044 struct ucred *ucred)
3f551f94
EB		 1045{
1046 ucred->pid = pid_vnr(pid);
1047 ucred->uid = ucred->gid = -1;
1048 if (cred) {
1049 struct user_namespace *current_ns = current_user_ns();
1050
b2e4f544
EB		 1051 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1052 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 1053 }
1054}
1055
1da177e4
LT		 1056int sock_getsockopt(struct socket *sock, int level, int optname,
1057 char __user *optval, int __user *optlen)
1058{
1059 struct sock *sk = sock->sk;
4ec93edb 1060
e71a4783 1061 union {
4ec93edb
YH		 1062 int val;
1063 struct linger ling;
1da177e4
LT		 1064 struct timeval tm;
1065 } v;
4ec93edb 1066
4d0392be 1067 int lv = sizeof(int);
1da177e4 1068 int len;
4ec93edb 1069
e71a4783 1070 if (get_user(len, optlen))
4ec93edb 1071 return -EFAULT;
e71a4783 1072 if (len < 0)
1da177e4 1073 return -EINVAL;
4ec93edb 1074
50fee1de 1075 memset(&v, 0, sizeof(v));
df0bca04 1076
2a91525c 1077 switch (optname) {
e71a4783
SH		 1078 case SO_DEBUG:
1079 v.val = sock_flag(sk, SOCK_DBG);
1080 break;
1081
1082 case SO_DONTROUTE:
1083 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1084 break;
1085
1086 case SO_BROADCAST:
1b23a5df 1087 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1088 break;
1089
1090 case SO_SNDBUF:
1091 v.val = sk->sk_sndbuf;
1092 break;
1093
1094 case SO_RCVBUF:
1095 v.val = sk->sk_rcvbuf;
1096 break;
1097
1098 case SO_REUSEADDR:
1099 v.val = sk->sk_reuse;
1100 break;
1101
055dc21a
TH		 1102 case SO_REUSEPORT:
1103 v.val = sk->sk_reuseport;
1104 break;
1105
e71a4783 1106 case SO_KEEPALIVE:
1b23a5df 1107 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1108 break;
1109
1110 case SO_TYPE:
1111 v.val = sk->sk_type;
1112 break;
1113
49c794e9
JE		 1114 case SO_PROTOCOL:
1115 v.val = sk->sk_protocol;
1116 break;
1117
0d6038ee
JE		 1118 case SO_DOMAIN:
1119 v.val = sk->sk_family;
1120 break;
1121
e71a4783
SH		 1122 case SO_ERROR:
1123 v.val = -sock_error(sk);
2a91525c 1124 if (v.val == 0)
e71a4783
SH		 1125 v.val = xchg(&sk->sk_err_soft, 0);
1126 break;
1127
1128 case SO_OOBINLINE:
1b23a5df 1129 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1130 break;
1131
1132 case SO_NO_CHECK:
28448b80 1133 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1134 break;
1135
1136 case SO_PRIORITY:
1137 v.val = sk->sk_priority;
1138 break;
1139
1140 case SO_LINGER:
1141 lv = sizeof(v.ling);
1b23a5df 1142 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1143 v.ling.l_linger = sk->sk_lingertime / HZ;
1144 break;
1145
1146 case SO_BSDCOMPAT:
1147 sock_warn_obsolete_bsdism("getsockopt");
1148 break;
1149
1150 case SO_TIMESTAMP:
92f37fd2
ED		 1151 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1152 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1153 break;
1154
1155 case SO_TIMESTAMPNS:
1156 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1157 break;
1158
20d49473 1159 case SO_TIMESTAMPING:
b9f40e21 1160 v.val = sk->sk_tsflags;
20d49473
PO		 1161 break;
1162
e71a4783 1163 case SO_RCVTIMEO:
2a91525c 1164 lv = sizeof(struct timeval);
e71a4783
SH		 1165 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1166 v.tm.tv_sec = 0;
1167 v.tm.tv_usec = 0;
1168 } else {
1169 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1170 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1171 }
1172 break;
1173
1174 case SO_SNDTIMEO:
2a91525c 1175 lv = sizeof(struct timeval);
e71a4783
SH		 1176 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1177 v.tm.tv_sec = 0;
1178 v.tm.tv_usec = 0;
1179 } else {
1180 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1181 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1182 }
1183 break;
1da177e4 1184
e71a4783
SH		 1185 case SO_RCVLOWAT:
1186 v.val = sk->sk_rcvlowat;
1187 break;
1da177e4 1188
e71a4783 1189 case SO_SNDLOWAT:
2a91525c 1190 v.val = 1;
e71a4783 1191 break;
1da177e4 1192
e71a4783 1193 case SO_PASSCRED:
82981930 1194 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1195 break;
1da177e4 1196
e71a4783 1197 case SO_PEERCRED:
109f6e39
EB		 1198 {
1199 struct ucred peercred;
1200 if (len > sizeof(peercred))
1201 len = sizeof(peercred);
1202 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1203 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1204 return -EFAULT;
1205 goto lenout;
109f6e39 1206 }
1da177e4 1207
e71a4783
SH		 1208 case SO_PEERNAME:
1209 {
1210 char address[128];
1211
1212 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1213 return -ENOTCONN;
1214 if (lv < len)
1215 return -EINVAL;
1216 if (copy_to_user(optval, address, len))
1217 return -EFAULT;
1218 goto lenout;
1219 }
1da177e4 1220
e71a4783
SH		 1221 /* Dubious BSD thing... Probably nobody even uses it, but
1222 * the UNIX standard wants it for whatever reason... -DaveM
1223 */
1224 case SO_ACCEPTCONN:
1225 v.val = sk->sk_state == TCP_LISTEN;
1226 break;
1da177e4 1227
e71a4783 1228 case SO_PASSSEC:
82981930 1229 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1230 break;
877ce7c1 1231
e71a4783
SH		 1232 case SO_PEERSEC:
1233 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1234
4a19ec58
LAT		 1235 case SO_MARK:
1236 v.val = sk->sk_mark;
1237 break;
1238
3b885787 1239 case SO_RXQ_OVFL:
1b23a5df 1240 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1241 break;
1242
6e3e939f 1243 case SO_WIFI_STATUS:
1b23a5df 1244 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1245 break;
1246
ef64a54f
PE		 1247 case SO_PEEK_OFF:
1248 if (!sock->ops->set_peek_off)
1249 return -EOPNOTSUPP;
1250
1251 v.val = sk->sk_peek_off;
1252 break;
bc2f7996 1253 case SO_NOFCS:
1b23a5df 1254 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1255 break;
c91f6df2 1256
f7b86bfe 1257 case SO_BINDTODEVICE:
c91f6df2
BH		 1258 return sock_getbindtodevice(sk, optval, optlen, len);
1259
a8fc9277
PE		 1260 case SO_GET_FILTER:
1261 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1262 if (len < 0)
1263 return len;
1264
1265 goto lenout;
c91f6df2 1266
d59577b6
VB		 1267 case SO_LOCK_FILTER:
1268 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1269 break;
1270
ea02f941
MS		 1271 case SO_BPF_EXTENSIONS:
1272 v.val = bpf_tell_extensions();
1273 break;
1274
7d4c04fc
KJ		 1275 case SO_SELECT_ERR_QUEUE:
1276 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1277 break;
1278
e0d1095a 1279#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1280 case SO_BUSY_POLL:
dafcc438
ET		 1281 v.val = sk->sk_ll_usec;
1282 break;
1283#endif
1284
62748f32
ED		 1285 case SO_MAX_PACING_RATE:
1286 v.val = sk->sk_max_pacing_rate;
1287 break;
1288
2c8c56e1
ED		 1289 case SO_INCOMING_CPU:
1290 v.val = sk->sk_incoming_cpu;
1291 break;
1292
e71a4783 1293 default:
443b5991
YH		 1294 /* We implement the SO_SNDLOWAT etc to not be settable
1295 * (1003.1g 7).
1296 */
e71a4783 1297 return -ENOPROTOOPT;
1da177e4 1298 }
e71a4783 1299
1da177e4
LT		 1300 if (len > lv)
1301 len = lv;
1302 if (copy_to_user(optval, &v, len))
1303 return -EFAULT;
1304lenout:
4ec93edb
YH		 1305 if (put_user(len, optlen))
1306 return -EFAULT;
1307 return 0;
1da177e4
LT		 1308}
1309
a5b5bb9a
IM		 1310/*
1311 * Initialize an sk_lock.
1312 *
1313 * (We also register the sk_lock with the lock validator.)
1314 */
b6f99a21 1315static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1316{
ed07536e
PZ		 1317 sock_lock_init_class_and_name(sk,
1318 af_family_slock_key_strings[sk->sk_family],
1319 af_family_slock_keys + sk->sk_family,
1320 af_family_key_strings[sk->sk_family],
1321 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1322}
1323
4dc6dc71
ED		 1324/*
1325 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1326 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1327 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1328 */
f1a6c4da
PE		 1329static void sock_copy(struct sock *nsk, const struct sock *osk)
1330{
1331#ifdef CONFIG_SECURITY_NETWORK
1332 void *sptr = nsk->sk_security;
1333#endif
68835aba
ED		 1334 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1335
1336 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1337 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1338
f1a6c4da
PE		 1339#ifdef CONFIG_SECURITY_NETWORK
1340 nsk->sk_security = sptr;
1341 security_sk_clone(osk, nsk);
1342#endif
1343}
1344
fcbdf09d
OP		 1345void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1346{
1347 unsigned long nulls1, nulls2;
1348
1349 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1350 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1351 if (nulls1 > nulls2)
1352 swap(nulls1, nulls2);
1353
1354 if (nulls1 != 0)
1355 memset((char *)sk, 0, nulls1);
1356 memset((char *)sk + nulls1 + sizeof(void *), 0,
1357 nulls2 - nulls1 - sizeof(void *));
1358 memset((char *)sk + nulls2 + sizeof(void *), 0,
1359 size - nulls2 - sizeof(void *));
1360}
1361EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1362
2e4afe7b
PE		 1363static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1364 int family)
c308c1b2
PE		 1365{
1366 struct sock *sk;
1367 struct kmem_cache *slab;
1368
1369 slab = prot->slab;
e912b114
ED		 1370 if (slab != NULL) {
1371 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1372 if (!sk)
1373 return sk;
1374 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1375 if (prot->clear_sk)
1376 prot->clear_sk(sk, prot->obj_size);
1377 else
1378 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1379 }
fcbdf09d 1380 } else
c308c1b2
PE		 1381 sk = kmalloc(prot->obj_size, priority);
1382
2e4afe7b 1383 if (sk != NULL) {
a98b65a3
VN		 1384 kmemcheck_annotate_bitfield(sk, flags);
1385
2e4afe7b
PE		 1386 if (security_sk_alloc(sk, family, priority))
1387 goto out_free;
1388
1389 if (!try_module_get(prot->owner))
1390 goto out_free_sec;
e022f0b4 1391 sk_tx_queue_clear(sk);
bd1060a1 1392 cgroup_sk_alloc(&sk->sk_cgrp_data);
2e4afe7b
PE		 1393 }
1394
c308c1b2 1395 return sk;
2e4afe7b
PE		 1396
1397out_free_sec:
1398 security_sk_free(sk);
1399out_free:
1400 if (slab != NULL)
1401 kmem_cache_free(slab, sk);
1402 else
1403 kfree(sk);
1404 return NULL;
c308c1b2
PE		 1405}
1406
1407static void sk_prot_free(struct proto *prot, struct sock *sk)
1408{
1409 struct kmem_cache *slab;
2e4afe7b 1410 struct module *owner;
c308c1b2 1411
2e4afe7b 1412 owner = prot->owner;
c308c1b2 1413 slab = prot->slab;
2e4afe7b 1414
bd1060a1 1415 cgroup_sk_free(&sk->sk_cgrp_data);
2e4afe7b 1416 security_sk_free(sk);
c308c1b2
PE		 1417 if (slab != NULL)
1418 kmem_cache_free(slab, sk);
1419 else
1420 kfree(sk);
2e4afe7b 1421 module_put(owner);
c308c1b2
PE		 1422}
1423
1da177e4
LT		 1424/**
1425 * sk_alloc - All socket objects are allocated here
c4ea43c5 1426 * @net: the applicable net namespace
4dc3b16b
PP		 1427 * @family: protocol family
1428 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1429 * @prot: struct proto associated with this new sock instance
11aa9c28 1430 * @kern: is this to be a kernel socket?
1da177e4 1431 */
1b8d7ae4 1432struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
11aa9c28 1433 struct proto *prot, int kern)
1da177e4 1434{
c308c1b2 1435 struct sock *sk;
1da177e4 1436
154adbc8 1437 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1438 if (sk) {
154adbc8
PE		 1439 sk->sk_family = family;
1440 /*
1441 * See comment in struct sock definition to understand
1442 * why we need sk_prot_creator -acme
1443 */
1444 sk->sk_prot = sk->sk_prot_creator = prot;
1445 sock_lock_init(sk);
26abe143
EB		 1446 sk->sk_net_refcnt = kern ? 0 : 1;
1447 if (likely(sk->sk_net_refcnt))
1448 get_net(net);
1449 sock_net_set(sk, net);
d66ee058 1450 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1451
2a56a1fe
TH		 1452 sock_update_classid(&sk->sk_cgrp_data);
1453 sock_update_netprioidx(&sk->sk_cgrp_data);
1da177e4 1454 }
a79af59e 1455
2e4afe7b 1456 return sk;
1da177e4 1457}
2a91525c 1458EXPORT_SYMBOL(sk_alloc);
1da177e4 1459
eb4cb008 1460void sk_destruct(struct sock *sk)
1da177e4
LT		 1461{
1462 struct sk_filter *filter;
1da177e4
LT		 1463
1464 if (sk->sk_destruct)
1465 sk->sk_destruct(sk);
1466
a898def2
PM		 1467 filter = rcu_dereference_check(sk->sk_filter,
1468 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1469 if (filter) {
309dd5fc 1470 sk_filter_uncharge(sk, filter);
a9b3cd7f 1471 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4 1472 }
538950a1
CG		 1473 if (rcu_access_pointer(sk->sk_reuseport_cb))
1474 reuseport_detach_sock(sk);
1da177e4 1475
08e29af3 1476 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1477
1478 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1479 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1480 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1481
109f6e39
EB		 1482 if (sk->sk_peer_cred)
1483 put_cred(sk->sk_peer_cred);
1484 put_pid(sk->sk_peer_pid);
26abe143
EB		 1485 if (likely(sk->sk_net_refcnt))
1486 put_net(sock_net(sk));
c308c1b2 1487 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1488}
2b85a34e 1489
eb4cb008
CG		 1490static void __sk_free(struct sock *sk)
1491{
b922622e 1492 if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt))
eb4cb008
CG		 1493 sock_diag_broadcast_destroy(sk);
1494 else
1495 sk_destruct(sk);
1496}
1497
2b85a34e
ED		 1498void sk_free(struct sock *sk)
1499{
1500 /*
25985edc 1501 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1502 * some packets are still in some tx queue.
1503 * If not null, sock_wfree() will call __sk_free(sk) later
1504 */
1505 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1506 __sk_free(sk);
1507}
2a91525c 1508EXPORT_SYMBOL(sk_free);
1da177e4 1509
e56c57d0
ED		 1510/**
1511 * sk_clone_lock - clone a socket, and lock its clone
1512 * @sk: the socket to clone
1513 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1514 *
1515 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1516 */
1517struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1518{
8fd1d178 1519 struct sock *newsk;
278571ba 1520 bool is_charged = true;
87d11ceb 1521
8fd1d178 1522 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1523 if (newsk != NULL) {
1524 struct sk_filter *filter;
1525
892c141e 1526 sock_copy(newsk, sk);
87d11ceb
ACM		 1527
1528 /* SANITY */
8a681736
SV		 1529 if (likely(newsk->sk_net_refcnt))
1530 get_net(sock_net(newsk));
87d11ceb
ACM		 1531 sk_node_init(&newsk->sk_node);
1532 sock_lock_init(newsk);
1533 bh_lock_sock(newsk);
fa438ccf 1534 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1535 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1536
1537 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1538 /*
1539 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1540 */
1541 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1542 atomic_set(&newsk->sk_omem_alloc, 0);
1543 skb_queue_head_init(&newsk->sk_receive_queue);
1544 skb_queue_head_init(&newsk->sk_write_queue);
1545
87d11ceb 1546 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1547 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1548 af_callback_keys + newsk->sk_family,
1549 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1550
1551 newsk->sk_dst_cache = NULL;
1552 newsk->sk_wmem_queued = 0;
1553 newsk->sk_forward_alloc = 0;
1554 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1555 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1556
1557 sock_reset_flag(newsk, SOCK_DONE);
1558 skb_queue_head_init(&newsk->sk_error_queue);
1559
0d7da9dd 1560 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb 1561 if (filter != NULL)
278571ba
AS		 1562 /* though it's an empty new sock, the charging may fail
1563 * if sysctl_optmem_max was changed between creation of
1564 * original socket and cloning
1565 */
1566 is_charged = sk_filter_charge(newsk, filter);
87d11ceb 1567
d188ba86 1568 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
87d11ceb
ACM		 1569 /* It is still raw copy of parent, so invalidate
1570 * destructor and make plain sk_free() */
1571 newsk->sk_destruct = NULL;
b0691c8e 1572 bh_unlock_sock(newsk);
87d11ceb
ACM		 1573 sk_free(newsk);
1574 newsk = NULL;
1575 goto out;
1576 }
1577
1578 newsk->sk_err = 0;
1579 newsk->sk_priority = 0;
2c8c56e1 1580 newsk->sk_incoming_cpu = raw_smp_processor_id();
33cf7c90 1581 atomic64_set(&newsk->sk_cookie, 0);
4dc6dc71
ED		 1582 /*
1583 * Before updating sk_refcnt, we must commit prior changes to memory
1584 * (Documentation/RCU/rculist_nulls.txt for details)
1585 */
1586 smp_wmb();
87d11ceb
ACM		 1587 atomic_set(&newsk->sk_refcnt, 2);
1588
1589 /*
1590 * Increment the counter in the same struct proto as the master
1591 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1592 * is the same as sk->sk_prot->socks, as this field was copied
1593 * with memcpy).
1594 *
1595 * This _changes_ the previous behaviour, where
1596 * tcp_create_openreq_child always was incrementing the
1597 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1598 * to be taken into account in all callers. -acme
1599 */
1600 sk_refcnt_debug_inc(newsk);
972692e0 1601 sk_set_socket(newsk, NULL);
43815482 1602 newsk->sk_wq = NULL;
87d11ceb 1603
3d596f7b
JW		 1604 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1605 sock_update_memcg(newsk);
f3f511e1 1606
87d11ceb 1607 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1608 sk_sockets_allocated_inc(newsk);
704da560 1609
080a270f
HFS		 1610 if (sock_needs_netstamp(sk) &&
1611 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1612 net_enable_timestamp();
87d11ceb
ACM		 1613 }
1614out:
1615 return newsk;
1616}
e56c57d0 1617EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1618
9958089a
AK		 1619void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1620{
d6a4e26a
ED		 1621 u32 max_segs = 1;
1622
6bd4f355 1623 sk_dst_set(sk, dst);
9958089a
AK		 1624 sk->sk_route_caps = dst->dev->features;
1625 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1626 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1627 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1628 if (sk_can_gso(sk)) {
82cc1a7a 1629 if (dst->header_len) {
9958089a 1630 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1631 } else {
9958089a 1632 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1633 sk->sk_gso_max_size = dst->dev->gso_max_size;
d6a4e26a 1634 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
82cc1a7a 1635 }
9958089a 1636 }
d6a4e26a 1637 sk->sk_gso_max_segs = max_segs;
9958089a
AK		 1638}
1639EXPORT_SYMBOL_GPL(sk_setup_caps);
1640
1da177e4
LT		 1641/*
1642 * Simple resource managers for sockets.
1643 */
1644
1645
4ec93edb
YH		 1646/*
1647 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1648 */
1649void sock_wfree(struct sk_buff *skb)
1650{
1651 struct sock *sk = skb->sk;
d99927f4 1652 unsigned int len = skb->truesize;
1da177e4 1653
d99927f4
ED		 1654 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1655 /*
1656 * Keep a reference on sk_wmem_alloc, this will be released
1657 * after sk_write_space() call
1658 */
1659 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1660 sk->sk_write_space(sk);
d99927f4
ED		 1661 len = 1;
1662 }
2b85a34e 1663 /*
d99927f4
ED		 1664 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1665 * could not do because of in-flight packets
2b85a34e 1666 */
d99927f4 1667 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1668 __sk_free(sk);
1da177e4 1669}
2a91525c 1670EXPORT_SYMBOL(sock_wfree);
1da177e4 1671
9e17f8a4
ED		 1672void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1673{
1674 skb_orphan(skb);
1675 skb->sk = sk;
1676#ifdef CONFIG_INET
1677 if (unlikely(!sk_fullsock(sk))) {
1678 skb->destructor = sock_edemux;
1679 sock_hold(sk);
1680 return;
1681 }
1682#endif
1683 skb->destructor = sock_wfree;
1684 skb_set_hash_from_sk(skb, sk);
1685 /*
1686 * We used to take a refcount on sk, but following operation
1687 * is enough to guarantee sk_free() wont free this sock until
1688 * all in-flight packets are completed
1689 */
1690 atomic_add(skb->truesize, &sk->sk_wmem_alloc);
1691}
1692EXPORT_SYMBOL(skb_set_owner_w);
1693
f2f872f9
ED		 1694void skb_orphan_partial(struct sk_buff *skb)
1695{
1696 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1697 * so we do not completely orphan skb, but transfert all
1698 * accounted bytes but one, to avoid unexpected reorders.
1699 */
1700 if (skb->destructor == sock_wfree
1701#ifdef CONFIG_INET
1702 || skb->destructor == tcp_wfree
1703#endif
1704 ) {
1705 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1706 skb->truesize = 1;
1707 } else {
1708 skb_orphan(skb);
1709 }
1710}
1711EXPORT_SYMBOL(skb_orphan_partial);
1712
4ec93edb
YH		 1713/*
1714 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1715 */
1716void sock_rfree(struct sk_buff *skb)
1717{
1718 struct sock *sk = skb->sk;
d361fd59 1719 unsigned int len = skb->truesize;
1da177e4 1720
d361fd59
ED		 1721 atomic_sub(len, &sk->sk_rmem_alloc);
1722 sk_mem_uncharge(sk, len);
1da177e4 1723}
2a91525c 1724EXPORT_SYMBOL(sock_rfree);
1da177e4 1725
7768eed8
OH		 1726/*
1727 * Buffer destructor for skbs that are not used directly in read or write
1728 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1729 */
62bccb8c
AD		 1730void sock_efree(struct sk_buff *skb)
1731{
1732 sock_put(skb->sk);
1733}
1734EXPORT_SYMBOL(sock_efree);
1735
976d0201 1736kuid_t sock_i_uid(struct sock *sk)
1da177e4 1737{
976d0201 1738 kuid_t uid;
1da177e4 1739
f064af1e 1740 read_lock_bh(&sk->sk_callback_lock);
976d0201 1741 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1742 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1743 return uid;
1744}
2a91525c 1745EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1746
1747unsigned long sock_i_ino(struct sock *sk)
1748{
1749 unsigned long ino;
1750
f064af1e 1751 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1752 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1753 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1754 return ino;
1755}
2a91525c 1756EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1757
1758/*
1759 * Allocate a skb from the socket's send buffer.
1760 */
86a76caf 1761struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1762 gfp_t priority)
1da177e4
LT		 1763{
1764 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1765 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1766 if (skb) {
1767 skb_set_owner_w(skb, sk);
1768 return skb;
1769 }
1770 }
1771 return NULL;
1772}
2a91525c 1773EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1774
4ec93edb 1775/*
1da177e4 1776 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1777 */
dd0fc66f 1778void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1779{
95c96174 1780 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1781 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1782 void *mem;
1783 /* First do the add, to avoid the race if kmalloc
4ec93edb 1784 * might sleep.
1da177e4
LT		 1785 */
1786 atomic_add(size, &sk->sk_omem_alloc);
1787 mem = kmalloc(size, priority);
1788 if (mem)
1789 return mem;
1790 atomic_sub(size, &sk->sk_omem_alloc);
1791 }
1792 return NULL;
1793}
2a91525c 1794EXPORT_SYMBOL(sock_kmalloc);
1da177e4 1795
79e88659
DB		 1796/* Free an option memory block. Note, we actually want the inline
1797 * here as this allows gcc to detect the nullify and fold away the
1798 * condition entirely.
1da177e4 1799 */
79e88659
DB		 1800static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1801 const bool nullify)
1da177e4 1802{
e53da5fb
DM		 1803 if (WARN_ON_ONCE(!mem))
1804 return;
79e88659
DB		 1805 if (nullify)
1806 kzfree(mem);
1807 else
1808 kfree(mem);
1da177e4
LT		 1809 atomic_sub(size, &sk->sk_omem_alloc);
1810}
79e88659
DB		 1811
1812void sock_kfree_s(struct sock *sk, void *mem, int size)
1813{
1814 __sock_kfree_s(sk, mem, size, false);
1815}
2a91525c 1816EXPORT_SYMBOL(sock_kfree_s);
1da177e4 1817
79e88659
DB		 1818void sock_kzfree_s(struct sock *sk, void *mem, int size)
1819{
1820 __sock_kfree_s(sk, mem, size, true);
1821}
1822EXPORT_SYMBOL(sock_kzfree_s);
1823
1da177e4
LT		 1824/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1825 I think, these locks should be removed for datagram sockets.
1826 */
2a91525c 1827static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1828{
1829 DEFINE_WAIT(wait);
1830
9cd3e072 1831 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1da177e4
LT		 1832 for (;;) {
1833 if (!timeo)
1834 break;
1835 if (signal_pending(current))
1836 break;
1837 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1838 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1839 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1840 break;
1841 if (sk->sk_shutdown & SEND_SHUTDOWN)
1842 break;
1843 if (sk->sk_err)
1844 break;
1845 timeo = schedule_timeout(timeo);
1846 }
aa395145 1847 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1848 return timeo;
1849}
1850
1851
1852/*
1853 * Generic send/receive buffer handlers
1854 */
1855
4cc7f68d
HX		 1856struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1857 unsigned long data_len, int noblock,
28d64271 1858 int *errcode, int max_page_order)
1da177e4 1859{
2e4e4410 1860 struct sk_buff *skb;
1da177e4
LT		 1861 long timeo;
1862 int err;
1863
1da177e4 1864 timeo = sock_sndtimeo(sk, noblock);
2e4e4410 1865 for (;;) {
1da177e4
LT		 1866 err = sock_error(sk);
1867 if (err != 0)
1868 goto failure;
1869
1870 err = -EPIPE;
1871 if (sk->sk_shutdown & SEND_SHUTDOWN)
1872 goto failure;
1873
2e4e4410
ED		 1874 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
1875 break;
28d64271 1876
9cd3e072 1877 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2e4e4410
ED		 1878 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1879 err = -EAGAIN;
1880 if (!timeo)
1da177e4 1881 goto failure;
2e4e4410
ED		 1882 if (signal_pending(current))
1883 goto interrupted;
1884 timeo = sock_wait_for_wmem(sk, timeo);
1da177e4 1885 }
2e4e4410
ED		 1886 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
1887 errcode, sk->sk_allocation);
1888 if (skb)
1889 skb_set_owner_w(skb, sk);
1da177e4
LT		 1890 return skb;
1891
1892interrupted:
1893 err = sock_intr_errno(timeo);
1894failure:
1895 *errcode = err;
1896 return NULL;
1897}
4cc7f68d 1898EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1899
4ec93edb 1900struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1901 int noblock, int *errcode)
1902{
28d64271 1903 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1904}
2a91525c 1905EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1906
f28ea365
EJ		 1907int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
1908 struct sockcm_cookie *sockc)
1909{
1910 struct cmsghdr *cmsg;
1911
1912 for_each_cmsghdr(cmsg, msg) {
1913 if (!CMSG_OK(msg, cmsg))
1914 return -EINVAL;
1915 if (cmsg->cmsg_level != SOL_SOCKET)
1916 continue;
1917 switch (cmsg->cmsg_type) {
1918 case SO_MARK:
1919 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1920 return -EPERM;
1921 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
1922 return -EINVAL;
1923 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
1924 break;
1925 default:
1926 return -EINVAL;
1927 }
1928 }
1929 return 0;
1930}
1931EXPORT_SYMBOL(sock_cmsg_send);
1932
5640f768
ED		 1933/* On 32bit arches, an skb frag is limited to 2^15 */
1934#define SKB_FRAG_PAGE_ORDER get_order(32768)
1935
400dfd3a
ED		 1936/**
1937 * skb_page_frag_refill - check that a page_frag contains enough room
1938 * @sz: minimum size of the fragment we want to get
1939 * @pfrag: pointer to page_frag
82d5e2b8 1940 * @gfp: priority for memory allocation
400dfd3a
ED		 1941 *
1942 * Note: While this allocator tries to use high order pages, there is
1943 * no guarantee that allocations succeed. Therefore, @sz MUST be
1944 * less or equal than PAGE_SIZE.
1945 */
d9b2938a 1946bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 1947{
5640f768
ED		 1948 if (pfrag->page) {
1949 if (atomic_read(&pfrag->page->_count) == 1) {
1950 pfrag->offset = 0;
1951 return true;
1952 }
400dfd3a 1953 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1954 return true;
1955 put_page(pfrag->page);
1956 }
1957
d9b2938a
ED		 1958 pfrag->offset = 0;
1959 if (SKB_FRAG_PAGE_ORDER) {
d0164adc
MG		 1960 /* Avoid direct reclaim but allow kswapd to wake */
1961 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
1962 __GFP_COMP | __GFP_NOWARN |
1963 __GFP_NORETRY,
d9b2938a 1964 SKB_FRAG_PAGE_ORDER);
5640f768 1965 if (likely(pfrag->page)) {
d9b2938a 1966 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 1967 return true;
1968 }
d9b2938a
ED		 1969 }
1970 pfrag->page = alloc_page(gfp);
1971 if (likely(pfrag->page)) {
1972 pfrag->size = PAGE_SIZE;
1973 return true;
1974 }
400dfd3a
ED		 1975 return false;
1976}
1977EXPORT_SYMBOL(skb_page_frag_refill);
1978
1979bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1980{
1981 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1982 return true;
1983
5640f768
ED		 1984 sk_enter_memory_pressure(sk);
1985 sk_stream_moderate_sndbuf(sk);
1986 return false;
1987}
1988EXPORT_SYMBOL(sk_page_frag_refill);
1989
1da177e4 1990static void __lock_sock(struct sock *sk)
f39234d6
NK		 1991 __releases(&sk->sk_lock.slock)
1992 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1993{
1994 DEFINE_WAIT(wait);
1995
e71a4783 1996 for (;;) {
1da177e4
LT		 1997 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1998 TASK_UNINTERRUPTIBLE);
1999 spin_unlock_bh(&sk->sk_lock.slock);
2000 schedule();
2001 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 2002 if (!sock_owned_by_user(sk))
1da177e4
LT		 2003 break;
2004 }
2005 finish_wait(&sk->sk_lock.wq, &wait);
2006}
2007
2008static void __release_sock(struct sock *sk)
f39234d6
NK		 2009 __releases(&sk->sk_lock.slock)
2010 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 2011{
2012 struct sk_buff *skb = sk->sk_backlog.head;
2013
2014 do {
2015 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
2016 bh_unlock_sock(sk);
2017
2018 do {
2019 struct sk_buff *next = skb->next;
2020
e4cbb02a 2021 prefetch(next);
7fee226a 2022 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 2023 skb->next = NULL;
c57943a1 2024 sk_backlog_rcv(sk, skb);
1da177e4
LT		 2025
2026 /*
2027 * We are in process context here with softirqs
2028 * disabled, use cond_resched_softirq() to preempt.
2029 * This is safe to do because we've taken the backlog
2030 * queue private:
2031 */
2032 cond_resched_softirq();
2033
2034 skb = next;
2035 } while (skb != NULL);
2036
2037 bh_lock_sock(sk);
e71a4783 2038 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 2039
2040 /*
2041 * Doing the zeroing here guarantee we can not loop forever
2042 * while a wild producer attempts to flood us.
2043 */
2044 sk->sk_backlog.len = 0;
1da177e4
LT		 2045}
2046
2047/**
2048 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 2049 * @sk: sock to wait on
2050 * @timeo: for how long
dfbafc99 2051 * @skb: last skb seen on sk_receive_queue
1da177e4
LT		 2052 *
2053 * Now socket state including sk->sk_err is changed only under lock,
2054 * hence we may omit checks after joining wait queue.
2055 * We check receive queue before schedule() only as optimization;
2056 * it is very likely that release_sock() added new data.
2057 */
dfbafc99 2058int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
1da177e4
LT		 2059{
2060 int rc;
2061 DEFINE_WAIT(wait);
2062
aa395145 2063 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9cd3e072 2064 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
dfbafc99 2065 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb);
9cd3e072 2066 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
aa395145 2067 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 2068 return rc;
2069}
1da177e4
LT		 2070EXPORT_SYMBOL(sk_wait_data);
2071
3ab224be
HA		 2072/**
2073 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2074 * @sk: socket
2075 * @size: memory size to allocate
2076 * @kind: allocation type
2077 *
2078 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2079 * rmem allocation. This function assumes that protocols which have
2080 * memory_pressure use sk_wmem_queued as write buffer accounting.
2081 */
2082int __sk_mem_schedule(struct sock *sk, int size, int kind)
2083{
2084 struct proto *prot = sk->sk_prot;
2085 int amt = sk_mem_pages(size);
8d987e5c 2086 long allocated;
3ab224be
HA		 2087
2088 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 2089
e805605c
JW		 2090 allocated = sk_memory_allocated_add(sk, amt);
2091
2092 if (mem_cgroup_sockets_enabled && sk->sk_cgrp &&
2093 !mem_cgroup_charge_skmem(sk->sk_cgrp, amt))
2094 goto suppress_allocation;
3ab224be
HA		 2095
2096 /* Under limit. */
e805605c 2097 if (allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2098 sk_leave_memory_pressure(sk);
3ab224be
HA		 2099 return 1;
2100 }
2101
e805605c
JW		 2102 /* Under pressure. */
2103 if (allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2104 sk_enter_memory_pressure(sk);
3ab224be 2105
e805605c
JW		 2106 /* Over hard limit. */
2107 if (allocated > sk_prot_mem_limits(sk, 2))
3ab224be
HA		 2108 goto suppress_allocation;
2109
2110 /* guarantee minimum buffer size under pressure */
2111 if (kind == SK_MEM_RECV) {
2112 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2113 return 1;
180d8cd9 2114
3ab224be
HA		 2115 } else { /* SK_MEM_SEND */
2116 if (sk->sk_type == SOCK_STREAM) {
2117 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2118 return 1;
2119 } else if (atomic_read(&sk->sk_wmem_alloc) <
2120 prot->sysctl_wmem[0])
2121 return 1;
2122 }
2123
180d8cd9 2124 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2125 int alloc;
2126
180d8cd9 2127 if (!sk_under_memory_pressure(sk))
1748376b 2128 return 1;
180d8cd9
GC		 2129 alloc = sk_sockets_allocated_read_positive(sk);
2130 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2131 sk_mem_pages(sk->sk_wmem_queued +
2132 atomic_read(&sk->sk_rmem_alloc) +
2133 sk->sk_forward_alloc))
2134 return 1;
2135 }
2136
2137suppress_allocation:
2138
2139 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2140 sk_stream_moderate_sndbuf(sk);
2141
2142 /* Fail only if socket is _under_ its sndbuf.
2143 * In this case we cannot block, so that we have to fail.
2144 */
2145 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2146 return 1;
2147 }
2148
3847ce32
SM		 2149 trace_sock_exceed_buf_limit(sk, prot, allocated);
2150
3ab224be
HA		 2151 /* Alas. Undo changes. */
2152 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2153
0e90b31f 2154 sk_memory_allocated_sub(sk, amt);
180d8cd9 2155
e805605c
JW		 2156 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
2157 mem_cgroup_uncharge_skmem(sk->sk_cgrp, amt);
2158
3ab224be
HA		 2159 return 0;
2160}
3ab224be
HA		 2161EXPORT_SYMBOL(__sk_mem_schedule);
2162
2163/**
69dba9bb 2164 * __sk_mem_reclaim - reclaim memory_allocated
3ab224be 2165 * @sk: socket
1a24e04e 2166 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
3ab224be 2167 */
1a24e04e 2168void __sk_mem_reclaim(struct sock *sk, int amount)
3ab224be 2169{
1a24e04e
ED		 2170 amount >>= SK_MEM_QUANTUM_SHIFT;
2171 sk_memory_allocated_sub(sk, amount);
2172 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
3ab224be 2173
e805605c
JW		 2174 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
2175 mem_cgroup_uncharge_skmem(sk->sk_cgrp, amount);
2176
180d8cd9
GC		 2177 if (sk_under_memory_pressure(sk) &&
2178 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2179 sk_leave_memory_pressure(sk);
3ab224be 2180}
3ab224be
HA		 2181EXPORT_SYMBOL(__sk_mem_reclaim);
2182
2183
1da177e4
LT		 2184/*
2185 * Set of default routines for initialising struct proto_ops when
2186 * the protocol does not support a particular function. In certain
2187 * cases where it makes no sense for a protocol to have a "do nothing"
2188 * function, some default processing is provided.
2189 */
2190
2191int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2192{
2193 return -EOPNOTSUPP;
2194}
2a91525c 2195EXPORT_SYMBOL(sock_no_bind);
1da177e4 2196
4ec93edb 2197int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2198 int len, int flags)
2199{
2200 return -EOPNOTSUPP;
2201}
2a91525c 2202EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2203
2204int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2205{
2206 return -EOPNOTSUPP;
2207}
2a91525c 2208EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2209
2210int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2211{
2212 return -EOPNOTSUPP;
2213}
2a91525c 2214EXPORT_SYMBOL(sock_no_accept);
1da177e4 2215
4ec93edb 2216int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2217 int *len, int peer)
2218{
2219 return -EOPNOTSUPP;
2220}
2a91525c 2221EXPORT_SYMBOL(sock_no_getname);
1da177e4 2222
2a91525c 2223unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2224{
2225 return 0;
2226}
2a91525c 2227EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2228
2229int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2230{
2231 return -EOPNOTSUPP;
2232}
2a91525c 2233EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2234
2235int sock_no_listen(struct socket *sock, int backlog)
2236{
2237 return -EOPNOTSUPP;
2238}
2a91525c 2239EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2240
2241int sock_no_shutdown(struct socket *sock, int how)
2242{
2243 return -EOPNOTSUPP;
2244}
2a91525c 2245EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2246
2247int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2248 char __user *optval, unsigned int optlen)
1da177e4
LT		 2249{
2250 return -EOPNOTSUPP;
2251}
2a91525c 2252EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2253
2254int sock_no_getsockopt(struct socket *sock, int level, int optname,
2255 char __user *optval, int __user *optlen)
2256{
2257 return -EOPNOTSUPP;
2258}
2a91525c 2259EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4 2260
1b784140 2261int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
1da177e4
LT		 2262{
2263 return -EOPNOTSUPP;
2264}
2a91525c 2265EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4 2266
1b784140
YX		 2267int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2268 int flags)
1da177e4
LT		 2269{
2270 return -EOPNOTSUPP;
2271}
2a91525c 2272EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2273
2274int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2275{
2276 /* Mirror missing mmap method error code */
2277 return -ENODEV;
2278}
2a91525c 2279EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2280
2281ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2282{
2283 ssize_t res;
2284 struct msghdr msg = {.msg_flags = flags};
2285 struct kvec iov;
2286 char *kaddr = kmap(page);
2287 iov.iov_base = kaddr + offset;
2288 iov.iov_len = size;
2289 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2290 kunmap(page);
2291 return res;
2292}
2a91525c 2293EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2294
2295/*
2296 * Default Socket Callbacks
2297 */
2298
2299static void sock_def_wakeup(struct sock *sk)
2300{
43815482
ED		 2301 struct socket_wq *wq;
2302
2303 rcu_read_lock();
2304 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2305 if (skwq_has_sleeper(wq))
43815482
ED		 2306 wake_up_interruptible_all(&wq->wait);
2307 rcu_read_unlock();
1da177e4
LT		 2308}
2309
2310static void sock_def_error_report(struct sock *sk)
2311{
43815482
ED		 2312 struct socket_wq *wq;
2313
2314 rcu_read_lock();
2315 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2316 if (skwq_has_sleeper(wq))
43815482 2317 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2318 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2319 rcu_read_unlock();
1da177e4
LT		 2320}
2321
676d2369 2322static void sock_def_readable(struct sock *sk)
1da177e4 2323{
43815482
ED		 2324 struct socket_wq *wq;
2325
2326 rcu_read_lock();
2327 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2328 if (skwq_has_sleeper(wq))
2c6607c6 2329 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2330 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2331 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2332 rcu_read_unlock();
1da177e4
LT		 2333}
2334
2335static void sock_def_write_space(struct sock *sk)
2336{
43815482
ED		 2337 struct socket_wq *wq;
2338
2339 rcu_read_lock();
1da177e4
LT		 2340
2341 /* Do not wake up a writer until he can make "significant"
2342 * progress. --DaveM
2343 */
e71a4783 2344 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482 2345 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2346 if (skwq_has_sleeper(wq))
43815482 2347 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2348 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2349
2350 /* Should agree with poll, otherwise some programs break */
2351 if (sock_writeable(sk))
8d8ad9d7 2352 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2353 }
2354
43815482 2355 rcu_read_unlock();
1da177e4
LT		 2356}
2357
2358static void sock_def_destruct(struct sock *sk)
2359{
1da177e4
LT		 2360}
2361
2362void sk_send_sigurg(struct sock *sk)
2363{
2364 if (sk->sk_socket && sk->sk_socket->file)
2365 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2366 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2367}
2a91525c 2368EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2369
2370void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2371 unsigned long expires)
2372{
2373 if (!mod_timer(timer, expires))
2374 sock_hold(sk);
2375}
1da177e4
LT		 2376EXPORT_SYMBOL(sk_reset_timer);
2377
2378void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2379{
25cc4ae9 2380 if (del_timer(timer))
1da177e4
LT		 2381 __sock_put(sk);
2382}
1da177e4
LT		 2383EXPORT_SYMBOL(sk_stop_timer);
2384
2385void sock_init_data(struct socket *sock, struct sock *sk)
2386{
2387 skb_queue_head_init(&sk->sk_receive_queue);
2388 skb_queue_head_init(&sk->sk_write_queue);
2389 skb_queue_head_init(&sk->sk_error_queue);
2390
2391 sk->sk_send_head = NULL;
2392
2393 init_timer(&sk->sk_timer);
4ec93edb 2394
1da177e4
LT		 2395 sk->sk_allocation = GFP_KERNEL;
2396 sk->sk_rcvbuf = sysctl_rmem_default;
2397 sk->sk_sndbuf = sysctl_wmem_default;
2398 sk->sk_state = TCP_CLOSE;
972692e0 2399 sk_set_socket(sk, sock);
1da177e4
LT		 2400
2401 sock_set_flag(sk, SOCK_ZAPPED);
2402
e71a4783 2403 if (sock) {
1da177e4 2404 sk->sk_type = sock->type;
43815482 2405 sk->sk_wq = sock->wq;
1da177e4
LT		 2406 sock->sk = sk;
2407 } else
43815482 2408 sk->sk_wq = NULL;
1da177e4 2409
1da177e4 2410 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2411 lockdep_set_class_and_name(&sk->sk_callback_lock,
2412 af_callback_keys + sk->sk_family,
2413 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2414
2415 sk->sk_state_change = sock_def_wakeup;
2416 sk->sk_data_ready = sock_def_readable;
2417 sk->sk_write_space = sock_def_write_space;
2418 sk->sk_error_report = sock_def_error_report;
2419 sk->sk_destruct = sock_def_destruct;
2420
5640f768
ED		 2421 sk->sk_frag.page = NULL;
2422 sk->sk_frag.offset = 0;
ef64a54f 2423 sk->sk_peek_off = -1;
1da177e4 2424
109f6e39
EB		 2425 sk->sk_peer_pid = NULL;
2426 sk->sk_peer_cred = NULL;
1da177e4
LT		 2427 sk->sk_write_pending = 0;
2428 sk->sk_rcvlowat = 1;
2429 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2430 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2431
f37f0afb 2432 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2433
e0d1095a 2434#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2435 sk->sk_napi_id = 0;
64b0dc51 2436 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2437#endif
2438
62748f32 2439 sk->sk_max_pacing_rate = ~0U;
7eec4174 2440 sk->sk_pacing_rate = ~0U;
70da268b 2441 sk->sk_incoming_cpu = -1;
4dc6dc71
ED		 2442 /*
2443 * Before updating sk_refcnt, we must commit prior changes to memory
2444 * (Documentation/RCU/rculist_nulls.txt for details)
2445 */
2446 smp_wmb();
1da177e4 2447 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2448 atomic_set(&sk->sk_drops, 0);
1da177e4 2449}
2a91525c 2450EXPORT_SYMBOL(sock_init_data);
1da177e4 2451
b5606c2d 2452void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2453{
2454 might_sleep();
a5b5bb9a 2455 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2456 if (sk->sk_lock.owned)
1da177e4 2457 __lock_sock(sk);
d2e9117c 2458 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2459 spin_unlock(&sk->sk_lock.slock);
2460 /*
2461 * The sk_lock has mutex_lock() semantics here:
2462 */
fcc70d5f 2463 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2464 local_bh_enable();
1da177e4 2465}
fcc70d5f 2466EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2467
b5606c2d 2468void release_sock(struct sock *sk)
1da177e4 2469{
a5b5bb9a
IM		 2470 /*
2471 * The sk_lock has mutex_unlock() semantics:
2472 */
2473 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2474
2475 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2476 if (sk->sk_backlog.tail)
2477 __release_sock(sk);
46d3ceab 2478
c3f9b018
ED		 2479 /* Warning : release_cb() might need to release sk ownership,
2480 * ie call sock_release_ownership(sk) before us.
2481 */
46d3ceab
ED		 2482 if (sk->sk_prot->release_cb)
2483 sk->sk_prot->release_cb(sk);
2484
c3f9b018 2485 sock_release_ownership(sk);
a5b5bb9a
IM		 2486 if (waitqueue_active(&sk->sk_lock.wq))
2487 wake_up(&sk->sk_lock.wq);
2488 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2489}
2490EXPORT_SYMBOL(release_sock);
2491
8a74ad60
ED		 2492/**
2493 * lock_sock_fast - fast version of lock_sock
2494 * @sk: socket
2495 *
2496 * This version should be used for very small section, where process wont block
2497 * return false if fast path is taken
2498 * sk_lock.slock locked, owned = 0, BH disabled
2499 * return true if slow path is taken
2500 * sk_lock.slock unlocked, owned = 1, BH enabled
2501 */
2502bool lock_sock_fast(struct sock *sk)
2503{
2504 might_sleep();
2505 spin_lock_bh(&sk->sk_lock.slock);
2506
2507 if (!sk->sk_lock.owned)
2508 /*
2509 * Note : We must disable BH
2510 */
2511 return false;
2512
2513 __lock_sock(sk);
2514 sk->sk_lock.owned = 1;
2515 spin_unlock(&sk->sk_lock.slock);
2516 /*
2517 * The sk_lock has mutex_lock() semantics here:
2518 */
2519 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2520 local_bh_enable();
2521 return true;
2522}
2523EXPORT_SYMBOL(lock_sock_fast);
2524
1da177e4 2525int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2526{
b7aa0bf7 2527 struct timeval tv;
1da177e4 2528 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2529 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2530 tv = ktime_to_timeval(sk->sk_stamp);
2531 if (tv.tv_sec == -1)
1da177e4 2532 return -ENOENT;
b7aa0bf7
ED		 2533 if (tv.tv_sec == 0) {
2534 sk->sk_stamp = ktime_get_real();
2535 tv = ktime_to_timeval(sk->sk_stamp);
2536 }
2537 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2538}
1da177e4
LT		 2539EXPORT_SYMBOL(sock_get_timestamp);
2540
ae40eb1e
ED		 2541int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2542{
2543 struct timespec ts;
2544 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2545 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2546 ts = ktime_to_timespec(sk->sk_stamp);
2547 if (ts.tv_sec == -1)
2548 return -ENOENT;
2549 if (ts.tv_sec == 0) {
2550 sk->sk_stamp = ktime_get_real();
2551 ts = ktime_to_timespec(sk->sk_stamp);
2552 }
2553 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2554}
2555EXPORT_SYMBOL(sock_get_timestampns);
2556
20d49473 2557void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2558{
20d49473 2559 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2560 unsigned long previous_flags = sk->sk_flags;
2561
20d49473
PO		 2562 sock_set_flag(sk, flag);
2563 /*
2564 * we just set one of the two flags which require net
2565 * time stamping, but time stamping might have been on
2566 * already because of the other one
2567 */
080a270f
HFS		 2568 if (sock_needs_netstamp(sk) &&
2569 !(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2570 net_enable_timestamp();
1da177e4
LT		 2571 }
2572}
1da177e4 2573
cb820f8e
RC		 2574int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2575 int level, int type)
2576{
2577 struct sock_exterr_skb *serr;
364a9e93 2578 struct sk_buff *skb;
cb820f8e
RC		 2579 int copied, err;
2580
2581 err = -EAGAIN;
364a9e93 2582 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 2583 if (skb == NULL)
2584 goto out;
2585
2586 copied = skb->len;
2587 if (copied > len) {
2588 msg->msg_flags |= MSG_TRUNC;
2589 copied = len;
2590 }
51f3d02b 2591 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 2592 if (err)
2593 goto out_free_skb;
2594
2595 sock_recv_timestamp(msg, sk, skb);
2596
2597 serr = SKB_EXT_ERR(skb);
2598 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2599
2600 msg->msg_flags |= MSG_ERRQUEUE;
2601 err = copied;
2602
cb820f8e
RC		 2603out_free_skb:
2604 kfree_skb(skb);
2605out:
2606 return err;
2607}
2608EXPORT_SYMBOL(sock_recv_errqueue);
2609
1da177e4
LT		 2610/*
2611 * Get a socket option on an socket.
2612 *
2613 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2614 * asynchronous errors should be reported by getsockopt. We assume
2615 * this means if you specify SO_ERROR (otherwise whats the point of it).
2616 */
2617int sock_common_getsockopt(struct socket *sock, int level, int optname,
2618 char __user *optval, int __user *optlen)
2619{
2620 struct sock *sk = sock->sk;
2621
2622 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2623}
1da177e4
LT		 2624EXPORT_SYMBOL(sock_common_getsockopt);
2625
3fdadf7d 2626#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2627int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2628 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2629{
2630 struct sock *sk = sock->sk;
2631
1e51f951 2632 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2633 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2634 optval, optlen);
3fdadf7d
DM		 2635 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2636}
2637EXPORT_SYMBOL(compat_sock_common_getsockopt);
2638#endif
2639
1b784140
YX		 2640int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2641 int flags)
1da177e4
LT		 2642{
2643 struct sock *sk = sock->sk;
2644 int addr_len = 0;
2645 int err;
2646
1b784140 2647 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
1da177e4
LT		 2648 flags & ~MSG_DONTWAIT, &addr_len);
2649 if (err >= 0)
2650 msg->msg_namelen = addr_len;
2651 return err;
2652}
1da177e4
LT		 2653EXPORT_SYMBOL(sock_common_recvmsg);
2654
2655/*
2656 * Set socket options on an inet socket.
2657 */
2658int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2659 char __user *optval, unsigned int optlen)
1da177e4
LT		 2660{
2661 struct sock *sk = sock->sk;
2662
2663 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2664}
1da177e4
LT		 2665EXPORT_SYMBOL(sock_common_setsockopt);
2666
3fdadf7d 2667#ifdef CONFIG_COMPAT
543d9cfe 2668int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2669 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2670{
2671 struct sock *sk = sock->sk;
2672
543d9cfe
ACM		 2673 if (sk->sk_prot->compat_setsockopt != NULL)
2674 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2675 optval, optlen);
3fdadf7d
DM		 2676 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2677}
2678EXPORT_SYMBOL(compat_sock_common_setsockopt);
2679#endif
2680
1da177e4
LT		 2681void sk_common_release(struct sock *sk)
2682{
2683 if (sk->sk_prot->destroy)
2684 sk->sk_prot->destroy(sk);
2685
2686 /*
2687 * Observation: when sock_common_release is called, processes have
2688 * no access to socket. But net still has.
2689 * Step one, detach it from networking:
2690 *
2691 * A. Remove from hash tables.
2692 */
2693
2694 sk->sk_prot->unhash(sk);
2695
2696 /*
2697 * In this point socket cannot receive new packets, but it is possible
2698 * that some packets are in flight because some CPU runs receiver and
2699 * did hash table lookup before we unhashed socket. They will achieve
2700 * receive queue and will be purged by socket destructor.
2701 *
2702 * Also we still have packets pending on receive queue and probably,
2703 * our own packets waiting in device queues. sock_destroy will drain
2704 * receive queue, but transmitted packets will delay socket destruction
2705 * until the last reference will be released.
2706 */
2707
2708 sock_orphan(sk);
2709
2710 xfrm_sk_free_policy(sk);
2711
e6848976 2712 sk_refcnt_debug_release(sk);
5640f768
ED		 2713
2714 if (sk->sk_frag.page) {
2715 put_page(sk->sk_frag.page);
2716 sk->sk_frag.page = NULL;
2717 }
2718
1da177e4
LT		 2719 sock_put(sk);
2720}
1da177e4
LT		 2721EXPORT_SYMBOL(sk_common_release);
2722
13ff3d6f
PE		 2723#ifdef CONFIG_PROC_FS
2724#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2725struct prot_inuse {
2726 int val[PROTO_INUSE_NR];
2727};
13ff3d6f
PE		 2728
2729static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2730
2731#ifdef CONFIG_NET_NS
2732void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2733{
d6d9ca0f 2734 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2735}
2736EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2737
2738int sock_prot_inuse_get(struct net *net, struct proto *prot)
2739{
2740 int cpu, idx = prot->inuse_idx;
2741 int res = 0;
2742
2743 for_each_possible_cpu(cpu)
2744 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2745
2746 return res >= 0 ? res : 0;
2747}
2748EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2749
2c8c1e72 2750static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2751{
2752 net->core.inuse = alloc_percpu(struct prot_inuse);
2753 return net->core.inuse ? 0 : -ENOMEM;
2754}
2755
2c8c1e72 2756static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2757{
2758 free_percpu(net->core.inuse);
2759}
2760
2761static struct pernet_operations net_inuse_ops = {
2762 .init = sock_inuse_init_net,
2763 .exit = sock_inuse_exit_net,
2764};
2765
2766static __init int net_inuse_init(void)
2767{
2768 if (register_pernet_subsys(&net_inuse_ops))
2769 panic("Cannot initialize net inuse counters");
2770
2771 return 0;
2772}
2773
2774core_initcall(net_inuse_init);
2775#else
1338d466
PE		 2776static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2777
c29a0bc4 2778void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2779{
d6d9ca0f 2780 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2781}
2782EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2783
c29a0bc4 2784int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2785{
2786 int cpu, idx = prot->inuse_idx;
2787 int res = 0;
2788
2789 for_each_possible_cpu(cpu)
2790 res += per_cpu(prot_inuse, cpu).val[idx];
2791
2792 return res >= 0 ? res : 0;
2793}
2794EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2795#endif
13ff3d6f
PE		 2796
2797static void assign_proto_idx(struct proto *prot)
2798{
2799 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2800
2801 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2802 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2803 return;
2804 }
2805
2806 set_bit(prot->inuse_idx, proto_inuse_idx);
2807}
2808
2809static void release_proto_idx(struct proto *prot)
2810{
2811 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2812 clear_bit(prot->inuse_idx, proto_inuse_idx);
2813}
2814#else
2815static inline void assign_proto_idx(struct proto *prot)
2816{
2817}
2818
2819static inline void release_proto_idx(struct proto *prot)
2820{
2821}
2822#endif
2823
0159dfd3
ED		 2824static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
2825{
2826 if (!rsk_prot)
2827 return;
2828 kfree(rsk_prot->slab_name);
2829 rsk_prot->slab_name = NULL;
adf78eda
JL		 2830 kmem_cache_destroy(rsk_prot->slab);
2831 rsk_prot->slab = NULL;
0159dfd3
ED		 2832}
2833
2834static int req_prot_init(const struct proto *prot)
2835{
2836 struct request_sock_ops *rsk_prot = prot->rsk_prot;
2837
2838 if (!rsk_prot)
2839 return 0;
2840
2841 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
2842 prot->name);
2843 if (!rsk_prot->slab_name)
2844 return -ENOMEM;
2845
2846 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
2847 rsk_prot->obj_size, 0,
e96f78ab 2848 prot->slab_flags, NULL);
0159dfd3
ED		 2849
2850 if (!rsk_prot->slab) {
2851 pr_crit("%s: Can't create request sock SLAB cache!\n",
2852 prot->name);
2853 return -ENOMEM;
2854 }
2855 return 0;
2856}
2857
b733c007
PE		 2858int proto_register(struct proto *prot, int alloc_slab)
2859{
1da177e4
LT		 2860 if (alloc_slab) {
2861 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2862 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2863 NULL);
1da177e4
LT		 2864
2865 if (prot->slab == NULL) {
e005d193
JP		 2866 pr_crit("%s: Can't create sock SLAB cache!\n",
2867 prot->name);
60e7663d 2868 goto out;
1da177e4 2869 }
2e6599cb 2870
0159dfd3
ED		 2871 if (req_prot_init(prot))
2872 goto out_free_request_sock_slab;
8feaf0c0 2873
6d6ee43e 2874 if (prot->twsk_prot != NULL) {
faf23422 2875 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2876
7e56b5d6 2877 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2878 goto out_free_request_sock_slab;
2879
6d6ee43e 2880 prot->twsk_prot->twsk_slab =
7e56b5d6 2881 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2882 prot->twsk_prot->twsk_obj_size,
3ab5aee7 2883 0,
52db70dc 2884 prot->slab_flags,
20c2df83 2885 NULL);
6d6ee43e 2886 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2887 goto out_free_timewait_sock_slab_name;
2888 }
1da177e4
LT		 2889 }
2890
36b77a52 2891 mutex_lock(&proto_list_mutex);
1da177e4 2892 list_add(&prot->node, &proto_list);
13ff3d6f 2893 assign_proto_idx(prot);
36b77a52 2894 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2895 return 0;
2896
8feaf0c0 2897out_free_timewait_sock_slab_name:
7e56b5d6 2898 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0 2899out_free_request_sock_slab:
0159dfd3
ED		 2900 req_prot_cleanup(prot->rsk_prot);
2901
2e6599cb
ACM		 2902 kmem_cache_destroy(prot->slab);
2903 prot->slab = NULL;
b733c007
PE		 2904out:
2905 return -ENOBUFS;
1da177e4 2906}
1da177e4
LT		 2907EXPORT_SYMBOL(proto_register);
2908
2909void proto_unregister(struct proto *prot)
2910{
36b77a52 2911 mutex_lock(&proto_list_mutex);
13ff3d6f 2912 release_proto_idx(prot);
0a3f4358 2913 list_del(&prot->node);
36b77a52 2914 mutex_unlock(&proto_list_mutex);
1da177e4 2915
adf78eda
JL		 2916 kmem_cache_destroy(prot->slab);
2917 prot->slab = NULL;
1da177e4 2918
0159dfd3 2919 req_prot_cleanup(prot->rsk_prot);
2e6599cb 2920
6d6ee43e 2921 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2922 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2923 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2924 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2925 }
1da177e4 2926}
1da177e4
LT		 2927EXPORT_SYMBOL(proto_unregister);
2928
2929#ifdef CONFIG_PROC_FS
1da177e4 2930static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2931 __acquires(proto_list_mutex)
1da177e4 2932{
36b77a52 2933 mutex_lock(&proto_list_mutex);
60f0438a 2934 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2935}
2936
2937static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2938{
60f0438a 2939 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2940}
2941
2942static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2943 __releases(proto_list_mutex)
1da177e4 2944{
36b77a52 2945 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2946}
2947
2948static char proto_method_implemented(const void *method)
2949{
2950 return method == NULL ? 'n' : 'y';
2951}
180d8cd9
GC		 2952static long sock_prot_memory_allocated(struct proto *proto)
2953{
cb75a36c 2954 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2955}
2956
2957static char *sock_prot_memory_pressure(struct proto *proto)
2958{
2959 return proto->memory_pressure != NULL ?
2960 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2961}
1da177e4
LT		 2962
2963static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2964{
180d8cd9 2965
8d987e5c 2966 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2967 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2968 proto->name,
2969 proto->obj_size,
14e943db 2970 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2971 sock_prot_memory_allocated(proto),
2972 sock_prot_memory_pressure(proto),
1da177e4
LT		 2973 proto->max_header,
2974 proto->slab == NULL ? "no" : "yes",
2975 module_name(proto->owner),
2976 proto_method_implemented(proto->close),
2977 proto_method_implemented(proto->connect),
2978 proto_method_implemented(proto->disconnect),
2979 proto_method_implemented(proto->accept),
2980 proto_method_implemented(proto->ioctl),
2981 proto_method_implemented(proto->init),
2982 proto_method_implemented(proto->destroy),
2983 proto_method_implemented(proto->shutdown),
2984 proto_method_implemented(proto->setsockopt),
2985 proto_method_implemented(proto->getsockopt),
2986 proto_method_implemented(proto->sendmsg),
2987 proto_method_implemented(proto->recvmsg),
2988 proto_method_implemented(proto->sendpage),
2989 proto_method_implemented(proto->bind),
2990 proto_method_implemented(proto->backlog_rcv),
2991 proto_method_implemented(proto->hash),
2992 proto_method_implemented(proto->unhash),
2993 proto_method_implemented(proto->get_port),
2994 proto_method_implemented(proto->enter_memory_pressure));
2995}
2996
2997static int proto_seq_show(struct seq_file *seq, void *v)
2998{
60f0438a 2999 if (v == &proto_list)
1da177e4
LT		 3000 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3001 "protocol",
3002 "size",
3003 "sockets",
3004 "memory",
3005 "press",
3006 "maxhdr",
3007 "slab",
3008 "module",
3009 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3010 else
60f0438a 3011 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 3012 return 0;
3013}
3014
f690808e 3015static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 3016 .start = proto_seq_start,
3017 .next = proto_seq_next,
3018 .stop = proto_seq_stop,
3019 .show = proto_seq_show,
3020};
3021
3022static int proto_seq_open(struct inode *inode, struct file *file)
3023{
14e943db
ED		 3024 return seq_open_net(inode, file, &proto_seq_ops,
3025 sizeof(struct seq_net_private));
1da177e4
LT		 3026}
3027
9a32144e 3028static const struct file_operations proto_seq_fops = {
1da177e4
LT		 3029 .owner = THIS_MODULE,
3030 .open = proto_seq_open,
3031 .read = seq_read,
3032 .llseek = seq_lseek,
14e943db
ED		 3033 .release = seq_release_net,
3034};
3035
3036static __net_init int proto_init_net(struct net *net)
3037{
d4beaa66 3038 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 3039 return -ENOMEM;
3040
3041 return 0;
3042}
3043
3044static __net_exit void proto_exit_net(struct net *net)
3045{
ece31ffd 3046 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 3047}
3048
3049
3050static __net_initdata struct pernet_operations proto_net_ops = {
3051 .init = proto_init_net,
3052 .exit = proto_exit_net,
1da177e4
LT		 3053};
3054
3055static int __init proto_init(void)
3056{
14e943db 3057 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 3058}
3059
3060subsys_initcall(proto_init);
3061
3062#endif /* PROC_FS */
Linux kernel - Deliverables
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