projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
net-timestamp: no-payload option
[linux-2.6-block.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
4ec93edb 35 * code. The ACK stuff can wait and needs major
1da177e4
LT		 36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 *
85 *
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
90 */
91
e005d193
JP		 92#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
93
4fc268d2 94#include <linux/capability.h>
1da177e4 95#include <linux/errno.h>
cb820f8e 96#include <linux/errqueue.h>
1da177e4
LT		 97#include <linux/types.h>
98#include <linux/socket.h>
99#include <linux/in.h>
100#include <linux/kernel.h>
1da177e4
LT		 101#include <linux/module.h>
102#include <linux/proc_fs.h>
103#include <linux/seq_file.h>
104#include <linux/sched.h>
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>
1da177e4
LT		 134
135#include <linux/filter.h>
136
3847ce32
SM		 137#include <trace/events/sock.h>
138
1da177e4
LT		 139#ifdef CONFIG_INET
140#include <net/tcp.h>
141#endif
142
076bb0c8 143#include <net/busy_poll.h>
06021292 144
36b77a52 145static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 146static LIST_HEAD(proto_list);
147
a3b299da
EB		 148/**
149 * sk_ns_capable - General socket capability test
150 * @sk: Socket to use a capability on or through
151 * @user_ns: The user namespace of the capability to use
152 * @cap: The capability to use
153 *
154 * Test to see if the opener of the socket had when the socket was
155 * created and the current process has the capability @cap in the user
156 * namespace @user_ns.
157 */
158bool sk_ns_capable(const struct sock *sk,
159 struct user_namespace *user_ns, int cap)
160{
161 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
162 ns_capable(user_ns, cap);
163}
164EXPORT_SYMBOL(sk_ns_capable);
165
166/**
167 * sk_capable - Socket global capability test
168 * @sk: Socket to use a capability on or through
e793c0f7 169 * @cap: The global capability to use
a3b299da
EB		 170 *
171 * Test to see if the opener of the socket had when the socket was
172 * created and the current process has the capability @cap in all user
173 * namespaces.
174 */
175bool sk_capable(const struct sock *sk, int cap)
176{
177 return sk_ns_capable(sk, &init_user_ns, cap);
178}
179EXPORT_SYMBOL(sk_capable);
180
181/**
182 * sk_net_capable - Network namespace socket capability test
183 * @sk: Socket to use a capability on or through
184 * @cap: The capability to use
185 *
e793c0f7 186 * Test to see if the opener of the socket had when the socket was created
a3b299da
EB		 187 * and the current process has the capability @cap over the network namespace
188 * the socket is a member of.
189 */
190bool sk_net_capable(const struct sock *sk, int cap)
191{
192 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
193}
194EXPORT_SYMBOL(sk_net_capable);
195
196
c255a458 197#ifdef CONFIG_MEMCG_KMEM
1d62e436 198int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
d1a4c0b3
GC		 199{
200 struct proto *proto;
201 int ret = 0;
202
36b77a52 203 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 204 list_for_each_entry(proto, &proto_list, node) {
205 if (proto->init_cgroup) {
1d62e436 206 ret = proto->init_cgroup(memcg, ss);
d1a4c0b3
GC		 207 if (ret)
208 goto out;
209 }
210 }
211
36b77a52 212 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 213 return ret;
214out:
215 list_for_each_entry_continue_reverse(proto, &proto_list, node)
216 if (proto->destroy_cgroup)
1d62e436 217 proto->destroy_cgroup(memcg);
36b77a52 218 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 219 return ret;
220}
221
1d62e436 222void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
d1a4c0b3
GC		 223{
224 struct proto *proto;
225
36b77a52 226 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 227 list_for_each_entry_reverse(proto, &proto_list, node)
228 if (proto->destroy_cgroup)
1d62e436 229 proto->destroy_cgroup(memcg);
36b77a52 230 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 231}
232#endif
233
da21f24d
IM		 234/*
235 * Each address family might have different locking rules, so we have
236 * one slock key per address family:
237 */
a5b5bb9a
IM		 238static struct lock_class_key af_family_keys[AF_MAX];
239static struct lock_class_key af_family_slock_keys[AF_MAX];
240
cbda4eaf 241#if defined(CONFIG_MEMCG_KMEM)
c5905afb 242struct static_key memcg_socket_limit_enabled;
e1aab161 243EXPORT_SYMBOL(memcg_socket_limit_enabled);
cbda4eaf 244#endif
e1aab161 245
a5b5bb9a
IM		 246/*
247 * Make lock validator output more readable. (we pre-construct these
248 * strings build-time, so that runtime initialization of socket
249 * locks is fast):
250 */
36cbd3dc 251static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 252 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
253 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
254 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
255 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
256 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
257 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
258 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 259 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 260 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 261 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 262 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 263 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 264 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
456db6a4 265 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX"
a5b5bb9a 266};
36cbd3dc 267static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 268 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
269 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
270 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
271 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
272 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
273 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
274 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 275 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 276 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 277 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 278 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 279 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 280 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
456db6a4 281 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX"
a5b5bb9a 282};
36cbd3dc 283static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 284 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
285 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
286 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
287 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
288 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
289 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
290 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 291 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 292 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 293 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 294 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 295 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 296 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
456db6a4 297 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX"
443aef0e 298};
da21f24d
IM		 299
300/*
301 * sk_callback_lock locking rules are per-address-family,
302 * so split the lock classes by using a per-AF key:
303 */
304static struct lock_class_key af_callback_keys[AF_MAX];
305
1da177e4
LT		 306/* Take into consideration the size of the struct sk_buff overhead in the
307 * determination of these values, since that is non-constant across
308 * platforms. This makes socket queueing behavior and performance
309 * not depend upon such differences.
310 */
311#define _SK_MEM_PACKETS 256
87fb4b7b 312#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 313#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
314#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
315
316/* Run time adjustable parameters. */
ab32ea5d 317__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 318EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 319__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 320EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 321__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
322__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 323
25985edc 324/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 325int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 326EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 327
c93bdd0e
MG		 328struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
329EXPORT_SYMBOL_GPL(memalloc_socks);
330
7cb02404
MG		 331/**
332 * sk_set_memalloc - sets %SOCK_MEMALLOC
333 * @sk: socket to set it on
334 *
335 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
336 * It's the responsibility of the admin to adjust min_free_kbytes
337 * to meet the requirements
338 */
339void sk_set_memalloc(struct sock *sk)
340{
341 sock_set_flag(sk, SOCK_MEMALLOC);
342 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 343 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 344}
345EXPORT_SYMBOL_GPL(sk_set_memalloc);
346
347void sk_clear_memalloc(struct sock *sk)
348{
349 sock_reset_flag(sk, SOCK_MEMALLOC);
350 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 351 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 352
353 /*
354 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
355 * progress of swapping. However, if SOCK_MEMALLOC is cleared while
356 * it has rmem allocations there is a risk that the user of the
357 * socket cannot make forward progress due to exceeding the rmem
358 * limits. By rights, sk_clear_memalloc() should only be called
359 * on sockets being torn down but warn and reset the accounting if
360 * that assumption breaks.
361 */
362 if (WARN_ON(sk->sk_forward_alloc))
363 sk_mem_reclaim(sk);
7cb02404
MG		 364}
365EXPORT_SYMBOL_GPL(sk_clear_memalloc);
366
b4b9e355
MG		 367int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
368{
369 int ret;
370 unsigned long pflags = current->flags;
371
372 /* these should have been dropped before queueing */
373 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
374
375 current->flags |= PF_MEMALLOC;
376 ret = sk->sk_backlog_rcv(sk, skb);
377 tsk_restore_flags(current, pflags, PF_MEMALLOC);
378
379 return ret;
380}
381EXPORT_SYMBOL(__sk_backlog_rcv);
382
1da177e4
LT		 383static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
384{
385 struct timeval tv;
386
387 if (optlen < sizeof(tv))
388 return -EINVAL;
389 if (copy_from_user(&tv, optval, sizeof(tv)))
390 return -EFAULT;
ba78073e
VA		 391 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
392 return -EDOM;
1da177e4 393
ba78073e 394 if (tv.tv_sec < 0) {
6f11df83
AM		 395 static int warned __read_mostly;
396
ba78073e 397 *timeo_p = 0;
50aab54f 398 if (warned < 10 && net_ratelimit()) {
ba78073e 399 warned++;
e005d193
JP		 400 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
401 __func__, current->comm, task_pid_nr(current));
50aab54f 402 }
ba78073e
VA		 403 return 0;
404 }
1da177e4
LT		 405 *timeo_p = MAX_SCHEDULE_TIMEOUT;
406 if (tv.tv_sec == 0 && tv.tv_usec == 0)
407 return 0;
408 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
409 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
410 return 0;
411}
412
413static void sock_warn_obsolete_bsdism(const char *name)
414{
415 static int warned;
416 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 417 if (strcmp(warncomm, current->comm) && warned < 5) {
418 strcpy(warncomm, current->comm);
e005d193
JP		 419 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
420 warncomm, name);
1da177e4
LT		 421 warned++;
422 }
423}
424
08e29af3
ED		 425#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
426
427static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 428{
08e29af3
ED		 429 if (sk->sk_flags & flags) {
430 sk->sk_flags &= ~flags;
431 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 432 net_disable_timestamp();
1da177e4
LT		 433 }
434}
435
436
f0088a50
DV		 437int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
438{
766e9037 439 int err;
3b885787
NH		 440 unsigned long flags;
441 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 442
0fd7bac6 443 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 444 atomic_inc(&sk->sk_drops);
3847ce32 445 trace_sock_rcvqueue_full(sk, skb);
766e9037 446 return -ENOMEM;
f0088a50
DV		 447 }
448
fda9ef5d 449 err = sk_filter(sk, skb);
f0088a50 450 if (err)
766e9037 451 return err;
f0088a50 452
c76562b6 453 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 454 atomic_inc(&sk->sk_drops);
455 return -ENOBUFS;
3ab224be
HA		 456 }
457
f0088a50
DV		 458 skb->dev = NULL;
459 skb_set_owner_r(skb, sk);
49ad9599 460
7fee226a
ED		 461 /* we escape from rcu protected region, make sure we dont leak
462 * a norefcounted dst
463 */
464 skb_dst_force(skb);
465
3b885787
NH		 466 spin_lock_irqsave(&list->lock, flags);
467 skb->dropcount = atomic_read(&sk->sk_drops);
468 __skb_queue_tail(list, skb);
469 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 470
471 if (!sock_flag(sk, SOCK_DEAD))
676d2369 472 sk->sk_data_ready(sk);
766e9037 473 return 0;
f0088a50
DV		 474}
475EXPORT_SYMBOL(sock_queue_rcv_skb);
476
58a5a7b9 477int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 478{
479 int rc = NET_RX_SUCCESS;
480
fda9ef5d 481 if (sk_filter(sk, skb))
f0088a50
DV		 482 goto discard_and_relse;
483
484 skb->dev = NULL;
485
274f482d 486 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 487 atomic_inc(&sk->sk_drops);
488 goto discard_and_relse;
489 }
58a5a7b9
ACM		 490 if (nested)
491 bh_lock_sock_nested(sk);
492 else
493 bh_lock_sock(sk);
a5b5bb9a
IM		 494 if (!sock_owned_by_user(sk)) {
495 /*
496 * trylock + unlock semantics:
497 */
498 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
499
c57943a1 500 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 501
502 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 503 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 504 bh_unlock_sock(sk);
505 atomic_inc(&sk->sk_drops);
506 goto discard_and_relse;
507 }
508
f0088a50
DV		 509 bh_unlock_sock(sk);
510out:
511 sock_put(sk);
512 return rc;
513discard_and_relse:
514 kfree_skb(skb);
515 goto out;
516}
517EXPORT_SYMBOL(sk_receive_skb);
518
519struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
520{
b6c6712a 521 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 522
523 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 524 sk_tx_queue_clear(sk);
a9b3cd7f 525 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 526 dst_release(dst);
527 return NULL;
528 }
529
530 return dst;
531}
532EXPORT_SYMBOL(__sk_dst_check);
533
534struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
535{
536 struct dst_entry *dst = sk_dst_get(sk);
537
538 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
539 sk_dst_reset(sk);
540 dst_release(dst);
541 return NULL;
542 }
543
544 return dst;
545}
546EXPORT_SYMBOL(sk_dst_check);
547
c91f6df2
BH		 548static int sock_setbindtodevice(struct sock *sk, char __user *optval,
549 int optlen)
4878809f
DM		 550{
551 int ret = -ENOPROTOOPT;
552#ifdef CONFIG_NETDEVICES
3b1e0a65 553 struct net *net = sock_net(sk);
4878809f
DM		 554 char devname[IFNAMSIZ];
555 int index;
556
557 /* Sorry... */
558 ret = -EPERM;
5e1fccc0 559 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 560 goto out;
561
562 ret = -EINVAL;
563 if (optlen < 0)
564 goto out;
565
566 /* Bind this socket to a particular device like "eth0",
567 * as specified in the passed interface name. If the
568 * name is "" or the option length is zero the socket
569 * is not bound.
570 */
571 if (optlen > IFNAMSIZ - 1)
572 optlen = IFNAMSIZ - 1;
573 memset(devname, 0, sizeof(devname));
574
575 ret = -EFAULT;
576 if (copy_from_user(devname, optval, optlen))
577 goto out;
578
000ba2e4
DM		 579 index = 0;
580 if (devname[0] != '\0') {
bf8e56bf 581 struct net_device *dev;
4878809f 582
bf8e56bf
ED		 583 rcu_read_lock();
584 dev = dev_get_by_name_rcu(net, devname);
585 if (dev)
586 index = dev->ifindex;
587 rcu_read_unlock();
4878809f
DM		 588 ret = -ENODEV;
589 if (!dev)
590 goto out;
4878809f
DM		 591 }
592
593 lock_sock(sk);
594 sk->sk_bound_dev_if = index;
595 sk_dst_reset(sk);
596 release_sock(sk);
597
598 ret = 0;
599
600out:
601#endif
602
603 return ret;
604}
605
c91f6df2
BH		 606static int sock_getbindtodevice(struct sock *sk, char __user *optval,
607 int __user *optlen, int len)
608{
609 int ret = -ENOPROTOOPT;
610#ifdef CONFIG_NETDEVICES
611 struct net *net = sock_net(sk);
c91f6df2 612 char devname[IFNAMSIZ];
c91f6df2
BH		 613
614 if (sk->sk_bound_dev_if == 0) {
615 len = 0;
616 goto zero;
617 }
618
619 ret = -EINVAL;
620 if (len < IFNAMSIZ)
621 goto out;
622
5dbe7c17
NS		 623 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
624 if (ret)
c91f6df2 625 goto out;
c91f6df2
BH		 626
627 len = strlen(devname) + 1;
628
629 ret = -EFAULT;
630 if (copy_to_user(optval, devname, len))
631 goto out;
632
633zero:
634 ret = -EFAULT;
635 if (put_user(len, optlen))
636 goto out;
637
638 ret = 0;
639
640out:
641#endif
642
643 return ret;
644}
645
c0ef877b
PE		 646static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
647{
648 if (valbool)
649 sock_set_flag(sk, bit);
650 else
651 sock_reset_flag(sk, bit);
652}
653
1da177e4
LT		 654/*
655 * This is meant for all protocols to use and covers goings on
656 * at the socket level. Everything here is generic.
657 */
658
659int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 660 char __user *optval, unsigned int optlen)
1da177e4 661{
2a91525c 662 struct sock *sk = sock->sk;
1da177e4
LT		 663 int val;
664 int valbool;
665 struct linger ling;
666 int ret = 0;
4ec93edb 667
1da177e4
LT		 668 /*
669 * Options without arguments
670 */
671
4878809f 672 if (optname == SO_BINDTODEVICE)
c91f6df2 673 return sock_setbindtodevice(sk, optval, optlen);
4878809f 674
e71a4783
SH		 675 if (optlen < sizeof(int))
676 return -EINVAL;
4ec93edb 677
1da177e4
LT		 678 if (get_user(val, (int __user *)optval))
679 return -EFAULT;
4ec93edb 680
2a91525c 681 valbool = val ? 1 : 0;
1da177e4
LT		 682
683 lock_sock(sk);
684
2a91525c 685 switch (optname) {
e71a4783 686 case SO_DEBUG:
2a91525c 687 if (val && !capable(CAP_NET_ADMIN))
e71a4783 688 ret = -EACCES;
2a91525c 689 else
c0ef877b 690 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 691 break;
692 case SO_REUSEADDR:
4a17fd52 693 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 694 break;
055dc21a
TH		 695 case SO_REUSEPORT:
696 sk->sk_reuseport = valbool;
697 break;
e71a4783 698 case SO_TYPE:
49c794e9 699 case SO_PROTOCOL:
0d6038ee 700 case SO_DOMAIN:
e71a4783
SH		 701 case SO_ERROR:
702 ret = -ENOPROTOOPT;
703 break;
704 case SO_DONTROUTE:
c0ef877b 705 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 706 break;
707 case SO_BROADCAST:
708 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
709 break;
710 case SO_SNDBUF:
711 /* Don't error on this BSD doesn't and if you think
82981930
ED		 712 * about it this is right. Otherwise apps have to
713 * play 'guess the biggest size' games. RCVBUF/SNDBUF
714 * are treated in BSD as hints
715 */
716 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 717set_sndbuf:
e71a4783 718 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 719 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
720 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 721 sk->sk_write_space(sk);
722 break;
1da177e4 723
e71a4783
SH		 724 case SO_SNDBUFFORCE:
725 if (!capable(CAP_NET_ADMIN)) {
726 ret = -EPERM;
727 break;
728 }
729 goto set_sndbuf;
b0573dea 730
e71a4783
SH		 731 case SO_RCVBUF:
732 /* Don't error on this BSD doesn't and if you think
82981930
ED		 733 * about it this is right. Otherwise apps have to
734 * play 'guess the biggest size' games. RCVBUF/SNDBUF
735 * are treated in BSD as hints
736 */
737 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 738set_rcvbuf:
e71a4783
SH		 739 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
740 /*
741 * We double it on the way in to account for
742 * "struct sk_buff" etc. overhead. Applications
743 * assume that the SO_RCVBUF setting they make will
744 * allow that much actual data to be received on that
745 * socket.
746 *
747 * Applications are unaware that "struct sk_buff" and
748 * other overheads allocate from the receive buffer
749 * during socket buffer allocation.
750 *
751 * And after considering the possible alternatives,
752 * returning the value we actually used in getsockopt
753 * is the most desirable behavior.
754 */
82981930 755 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 756 break;
757
758 case SO_RCVBUFFORCE:
759 if (!capable(CAP_NET_ADMIN)) {
760 ret = -EPERM;
1da177e4 761 break;
e71a4783
SH		 762 }
763 goto set_rcvbuf;
1da177e4 764
e71a4783 765 case SO_KEEPALIVE:
1da177e4 766#ifdef CONFIG_INET
3e10986d
ED		 767 if (sk->sk_protocol == IPPROTO_TCP &&
768 sk->sk_type == SOCK_STREAM)
e71a4783 769 tcp_set_keepalive(sk, valbool);
1da177e4 770#endif
e71a4783
SH		 771 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
772 break;
773
774 case SO_OOBINLINE:
775 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
776 break;
777
778 case SO_NO_CHECK:
28448b80 779 sk->sk_no_check_tx = valbool;
e71a4783
SH		 780 break;
781
782 case SO_PRIORITY:
5e1fccc0
EB		 783 if ((val >= 0 && val <= 6) ||
784 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 785 sk->sk_priority = val;
786 else
787 ret = -EPERM;
788 break;
789
790 case SO_LINGER:
791 if (optlen < sizeof(ling)) {
792 ret = -EINVAL; /* 1003.1g */
1da177e4 793 break;
e71a4783 794 }
2a91525c 795 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 796 ret = -EFAULT;
1da177e4 797 break;
e71a4783
SH		 798 }
799 if (!ling.l_onoff)
800 sock_reset_flag(sk, SOCK_LINGER);
801 else {
1da177e4 802#if (BITS_PER_LONG == 32)
e71a4783
SH		 803 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
804 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 805 else
e71a4783
SH		 806#endif
807 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
808 sock_set_flag(sk, SOCK_LINGER);
809 }
810 break;
811
812 case SO_BSDCOMPAT:
813 sock_warn_obsolete_bsdism("setsockopt");
814 break;
815
816 case SO_PASSCRED:
817 if (valbool)
818 set_bit(SOCK_PASSCRED, &sock->flags);
819 else
820 clear_bit(SOCK_PASSCRED, &sock->flags);
821 break;
822
823 case SO_TIMESTAMP:
92f37fd2 824 case SO_TIMESTAMPNS:
e71a4783 825 if (valbool) {
92f37fd2
ED		 826 if (optname == SO_TIMESTAMP)
827 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
828 else
829 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 830 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 831 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 832 } else {
e71a4783 833 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 834 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
835 }
e71a4783
SH		 836 break;
837
20d49473
PO		 838 case SO_TIMESTAMPING:
839 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 840 ret = -EINVAL;
20d49473
PO		 841 break;
842 }
09c2d251 843 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765
WB		 844 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
845 if (sk->sk_protocol == IPPROTO_TCP) {
846 if (sk->sk_state != TCP_ESTABLISHED) {
847 ret = -EINVAL;
848 break;
849 }
850 sk->sk_tskey = tcp_sk(sk)->snd_una;
851 } else {
852 sk->sk_tskey = 0;
853 }
854 }
b9f40e21 855 sk->sk_tsflags = val;
20d49473
PO		 856 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
857 sock_enable_timestamp(sk,
858 SOCK_TIMESTAMPING_RX_SOFTWARE);
859 else
860 sock_disable_timestamp(sk,
08e29af3 861 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 862 break;
863
e71a4783
SH		 864 case SO_RCVLOWAT:
865 if (val < 0)
866 val = INT_MAX;
867 sk->sk_rcvlowat = val ? : 1;
868 break;
869
870 case SO_RCVTIMEO:
871 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
872 break;
873
874 case SO_SNDTIMEO:
875 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
876 break;
1da177e4 877
e71a4783
SH		 878 case SO_ATTACH_FILTER:
879 ret = -EINVAL;
880 if (optlen == sizeof(struct sock_fprog)) {
881 struct sock_fprog fprog;
1da177e4 882
e71a4783
SH		 883 ret = -EFAULT;
884 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 885 break;
e71a4783
SH		 886
887 ret = sk_attach_filter(&fprog, sk);
888 }
889 break;
890
89aa0758
AS		 891 case SO_ATTACH_BPF:
892 ret = -EINVAL;
893 if (optlen == sizeof(u32)) {
894 u32 ufd;
895
896 ret = -EFAULT;
897 if (copy_from_user(&ufd, optval, sizeof(ufd)))
898 break;
899
900 ret = sk_attach_bpf(ufd, sk);
901 }
902 break;
903
e71a4783 904 case SO_DETACH_FILTER:
55b33325 905 ret = sk_detach_filter(sk);
e71a4783 906 break;
1da177e4 907
d59577b6
VB		 908 case SO_LOCK_FILTER:
909 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
910 ret = -EPERM;
911 else
912 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
913 break;
914
e71a4783
SH		 915 case SO_PASSSEC:
916 if (valbool)
917 set_bit(SOCK_PASSSEC, &sock->flags);
918 else
919 clear_bit(SOCK_PASSSEC, &sock->flags);
920 break;
4a19ec58 921 case SO_MARK:
5e1fccc0 922 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 923 ret = -EPERM;
2a91525c 924 else
4a19ec58 925 sk->sk_mark = val;
4a19ec58 926 break;
877ce7c1 927
1da177e4
LT		 928 /* We implement the SO_SNDLOWAT etc to
929 not be settable (1003.1g 5.3) */
3b885787 930 case SO_RXQ_OVFL:
8083f0fc 931 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 932 break;
6e3e939f
JB		 933
934 case SO_WIFI_STATUS:
935 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
936 break;
937
ef64a54f
PE		 938 case SO_PEEK_OFF:
939 if (sock->ops->set_peek_off)
12663bfc 940 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 941 else
942 ret = -EOPNOTSUPP;
943 break;
3bdc0eba
BG		 944
945 case SO_NOFCS:
946 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
947 break;
948
7d4c04fc
KJ		 949 case SO_SELECT_ERR_QUEUE:
950 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
951 break;
952
e0d1095a 953#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 954 case SO_BUSY_POLL:
dafcc438
ET		 955 /* allow unprivileged users to decrease the value */
956 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
957 ret = -EPERM;
958 else {
959 if (val < 0)
960 ret = -EINVAL;
961 else
962 sk->sk_ll_usec = val;
963 }
964 break;
965#endif
62748f32
ED		 966
967 case SO_MAX_PACING_RATE:
968 sk->sk_max_pacing_rate = val;
969 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
970 sk->sk_max_pacing_rate);
971 break;
972
e71a4783
SH		 973 default:
974 ret = -ENOPROTOOPT;
975 break;
4ec93edb 976 }
1da177e4
LT		 977 release_sock(sk);
978 return ret;
979}
2a91525c 980EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 981
982
8f09898b 983static void cred_to_ucred(struct pid *pid, const struct cred *cred,
984 struct ucred *ucred)
3f551f94
EB		 985{
986 ucred->pid = pid_vnr(pid);
987 ucred->uid = ucred->gid = -1;
988 if (cred) {
989 struct user_namespace *current_ns = current_user_ns();
990
b2e4f544
EB		 991 ucred->uid = from_kuid_munged(current_ns, cred->euid);
992 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 993 }
994}
995
1da177e4
LT		 996int sock_getsockopt(struct socket *sock, int level, int optname,
997 char __user *optval, int __user *optlen)
998{
999 struct sock *sk = sock->sk;
4ec93edb 1000
e71a4783 1001 union {
4ec93edb
YH		 1002 int val;
1003 struct linger ling;
1da177e4
LT		 1004 struct timeval tm;
1005 } v;
4ec93edb 1006
4d0392be 1007 int lv = sizeof(int);
1da177e4 1008 int len;
4ec93edb 1009
e71a4783 1010 if (get_user(len, optlen))
4ec93edb 1011 return -EFAULT;
e71a4783 1012 if (len < 0)
1da177e4 1013 return -EINVAL;
4ec93edb 1014
50fee1de 1015 memset(&v, 0, sizeof(v));
df0bca04 1016
2a91525c 1017 switch (optname) {
e71a4783
SH		 1018 case SO_DEBUG:
1019 v.val = sock_flag(sk, SOCK_DBG);
1020 break;
1021
1022 case SO_DONTROUTE:
1023 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1024 break;
1025
1026 case SO_BROADCAST:
1b23a5df 1027 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1028 break;
1029
1030 case SO_SNDBUF:
1031 v.val = sk->sk_sndbuf;
1032 break;
1033
1034 case SO_RCVBUF:
1035 v.val = sk->sk_rcvbuf;
1036 break;
1037
1038 case SO_REUSEADDR:
1039 v.val = sk->sk_reuse;
1040 break;
1041
055dc21a
TH		 1042 case SO_REUSEPORT:
1043 v.val = sk->sk_reuseport;
1044 break;
1045
e71a4783 1046 case SO_KEEPALIVE:
1b23a5df 1047 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1048 break;
1049
1050 case SO_TYPE:
1051 v.val = sk->sk_type;
1052 break;
1053
49c794e9
JE		 1054 case SO_PROTOCOL:
1055 v.val = sk->sk_protocol;
1056 break;
1057
0d6038ee
JE		 1058 case SO_DOMAIN:
1059 v.val = sk->sk_family;
1060 break;
1061
e71a4783
SH		 1062 case SO_ERROR:
1063 v.val = -sock_error(sk);
2a91525c 1064 if (v.val == 0)
e71a4783
SH		 1065 v.val = xchg(&sk->sk_err_soft, 0);
1066 break;
1067
1068 case SO_OOBINLINE:
1b23a5df 1069 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1070 break;
1071
1072 case SO_NO_CHECK:
28448b80 1073 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1074 break;
1075
1076 case SO_PRIORITY:
1077 v.val = sk->sk_priority;
1078 break;
1079
1080 case SO_LINGER:
1081 lv = sizeof(v.ling);
1b23a5df 1082 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1083 v.ling.l_linger = sk->sk_lingertime / HZ;
1084 break;
1085
1086 case SO_BSDCOMPAT:
1087 sock_warn_obsolete_bsdism("getsockopt");
1088 break;
1089
1090 case SO_TIMESTAMP:
92f37fd2
ED		 1091 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1092 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1093 break;
1094
1095 case SO_TIMESTAMPNS:
1096 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1097 break;
1098
20d49473 1099 case SO_TIMESTAMPING:
b9f40e21 1100 v.val = sk->sk_tsflags;
20d49473
PO		 1101 break;
1102
e71a4783 1103 case SO_RCVTIMEO:
2a91525c 1104 lv = sizeof(struct timeval);
e71a4783
SH		 1105 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1106 v.tm.tv_sec = 0;
1107 v.tm.tv_usec = 0;
1108 } else {
1109 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1110 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1111 }
1112 break;
1113
1114 case SO_SNDTIMEO:
2a91525c 1115 lv = sizeof(struct timeval);
e71a4783
SH		 1116 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1117 v.tm.tv_sec = 0;
1118 v.tm.tv_usec = 0;
1119 } else {
1120 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1121 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1122 }
1123 break;
1da177e4 1124
e71a4783
SH		 1125 case SO_RCVLOWAT:
1126 v.val = sk->sk_rcvlowat;
1127 break;
1da177e4 1128
e71a4783 1129 case SO_SNDLOWAT:
2a91525c 1130 v.val = 1;
e71a4783 1131 break;
1da177e4 1132
e71a4783 1133 case SO_PASSCRED:
82981930 1134 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1135 break;
1da177e4 1136
e71a4783 1137 case SO_PEERCRED:
109f6e39
EB		 1138 {
1139 struct ucred peercred;
1140 if (len > sizeof(peercred))
1141 len = sizeof(peercred);
1142 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1143 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1144 return -EFAULT;
1145 goto lenout;
109f6e39 1146 }
1da177e4 1147
e71a4783
SH		 1148 case SO_PEERNAME:
1149 {
1150 char address[128];
1151
1152 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1153 return -ENOTCONN;
1154 if (lv < len)
1155 return -EINVAL;
1156 if (copy_to_user(optval, address, len))
1157 return -EFAULT;
1158 goto lenout;
1159 }
1da177e4 1160
e71a4783
SH		 1161 /* Dubious BSD thing... Probably nobody even uses it, but
1162 * the UNIX standard wants it for whatever reason... -DaveM
1163 */
1164 case SO_ACCEPTCONN:
1165 v.val = sk->sk_state == TCP_LISTEN;
1166 break;
1da177e4 1167
e71a4783 1168 case SO_PASSSEC:
82981930 1169 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1170 break;
877ce7c1 1171
e71a4783
SH		 1172 case SO_PEERSEC:
1173 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1174
4a19ec58
LAT		 1175 case SO_MARK:
1176 v.val = sk->sk_mark;
1177 break;
1178
3b885787 1179 case SO_RXQ_OVFL:
1b23a5df 1180 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1181 break;
1182
6e3e939f 1183 case SO_WIFI_STATUS:
1b23a5df 1184 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1185 break;
1186
ef64a54f
PE		 1187 case SO_PEEK_OFF:
1188 if (!sock->ops->set_peek_off)
1189 return -EOPNOTSUPP;
1190
1191 v.val = sk->sk_peek_off;
1192 break;
bc2f7996 1193 case SO_NOFCS:
1b23a5df 1194 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1195 break;
c91f6df2 1196
f7b86bfe 1197 case SO_BINDTODEVICE:
c91f6df2
BH		 1198 return sock_getbindtodevice(sk, optval, optlen, len);
1199
a8fc9277
PE		 1200 case SO_GET_FILTER:
1201 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1202 if (len < 0)
1203 return len;
1204
1205 goto lenout;
c91f6df2 1206
d59577b6
VB		 1207 case SO_LOCK_FILTER:
1208 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1209 break;
1210
ea02f941
MS		 1211 case SO_BPF_EXTENSIONS:
1212 v.val = bpf_tell_extensions();
1213 break;
1214
7d4c04fc
KJ		 1215 case SO_SELECT_ERR_QUEUE:
1216 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1217 break;
1218
e0d1095a 1219#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1220 case SO_BUSY_POLL:
dafcc438
ET		 1221 v.val = sk->sk_ll_usec;
1222 break;
1223#endif
1224
62748f32
ED		 1225 case SO_MAX_PACING_RATE:
1226 v.val = sk->sk_max_pacing_rate;
1227 break;
1228
2c8c56e1
ED		 1229 case SO_INCOMING_CPU:
1230 v.val = sk->sk_incoming_cpu;
1231 break;
1232
e71a4783
SH		 1233 default:
1234 return -ENOPROTOOPT;
1da177e4 1235 }
e71a4783 1236
1da177e4
LT		 1237 if (len > lv)
1238 len = lv;
1239 if (copy_to_user(optval, &v, len))
1240 return -EFAULT;
1241lenout:
4ec93edb
YH		 1242 if (put_user(len, optlen))
1243 return -EFAULT;
1244 return 0;
1da177e4
LT		 1245}
1246
a5b5bb9a
IM		 1247/*
1248 * Initialize an sk_lock.
1249 *
1250 * (We also register the sk_lock with the lock validator.)
1251 */
b6f99a21 1252static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1253{
ed07536e
PZ		 1254 sock_lock_init_class_and_name(sk,
1255 af_family_slock_key_strings[sk->sk_family],
1256 af_family_slock_keys + sk->sk_family,
1257 af_family_key_strings[sk->sk_family],
1258 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1259}
1260
4dc6dc71
ED		 1261/*
1262 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1263 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1264 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1265 */
f1a6c4da
PE		 1266static void sock_copy(struct sock *nsk, const struct sock *osk)
1267{
1268#ifdef CONFIG_SECURITY_NETWORK
1269 void *sptr = nsk->sk_security;
1270#endif
68835aba
ED		 1271 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1272
1273 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1274 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1275
f1a6c4da
PE		 1276#ifdef CONFIG_SECURITY_NETWORK
1277 nsk->sk_security = sptr;
1278 security_sk_clone(osk, nsk);
1279#endif
1280}
1281
fcbdf09d
OP		 1282void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1283{
1284 unsigned long nulls1, nulls2;
1285
1286 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1287 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1288 if (nulls1 > nulls2)
1289 swap(nulls1, nulls2);
1290
1291 if (nulls1 != 0)
1292 memset((char *)sk, 0, nulls1);
1293 memset((char *)sk + nulls1 + sizeof(void *), 0,
1294 nulls2 - nulls1 - sizeof(void *));
1295 memset((char *)sk + nulls2 + sizeof(void *), 0,
1296 size - nulls2 - sizeof(void *));
1297}
1298EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1299
2e4afe7b
PE		 1300static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1301 int family)
c308c1b2
PE		 1302{
1303 struct sock *sk;
1304 struct kmem_cache *slab;
1305
1306 slab = prot->slab;
e912b114
ED		 1307 if (slab != NULL) {
1308 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1309 if (!sk)
1310 return sk;
1311 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1312 if (prot->clear_sk)
1313 prot->clear_sk(sk, prot->obj_size);
1314 else
1315 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1316 }
fcbdf09d 1317 } else
c308c1b2
PE		 1318 sk = kmalloc(prot->obj_size, priority);
1319
2e4afe7b 1320 if (sk != NULL) {
a98b65a3
VN		 1321 kmemcheck_annotate_bitfield(sk, flags);
1322
2e4afe7b
PE		 1323 if (security_sk_alloc(sk, family, priority))
1324 goto out_free;
1325
1326 if (!try_module_get(prot->owner))
1327 goto out_free_sec;
e022f0b4 1328 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1329 }
1330
c308c1b2 1331 return sk;
2e4afe7b
PE		 1332
1333out_free_sec:
1334 security_sk_free(sk);
1335out_free:
1336 if (slab != NULL)
1337 kmem_cache_free(slab, sk);
1338 else
1339 kfree(sk);
1340 return NULL;
c308c1b2
PE		 1341}
1342
1343static void sk_prot_free(struct proto *prot, struct sock *sk)
1344{
1345 struct kmem_cache *slab;
2e4afe7b 1346 struct module *owner;
c308c1b2 1347
2e4afe7b 1348 owner = prot->owner;
c308c1b2 1349 slab = prot->slab;
2e4afe7b
PE		 1350
1351 security_sk_free(sk);
c308c1b2
PE		 1352 if (slab != NULL)
1353 kmem_cache_free(slab, sk);
1354 else
1355 kfree(sk);
2e4afe7b 1356 module_put(owner);
c308c1b2
PE		 1357}
1358
86f8515f 1359#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
6ffd4641 1360void sock_update_netprioidx(struct sock *sk)
5bc1421e 1361{
5bc1421e
NH		 1362 if (in_interrupt())
1363 return;
2b73bc65 1364
6ffd4641 1365 sk->sk_cgrp_prioidx = task_netprioidx(current);
5bc1421e
NH		 1366}
1367EXPORT_SYMBOL_GPL(sock_update_netprioidx);
f8451725
HX		 1368#endif
1369
1da177e4
LT		 1370/**
1371 * sk_alloc - All socket objects are allocated here
c4ea43c5 1372 * @net: the applicable net namespace
4dc3b16b
PP		 1373 * @family: protocol family
1374 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1375 * @prot: struct proto associated with this new sock instance
1da177e4 1376 */
1b8d7ae4 1377struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1378 struct proto *prot)
1da177e4 1379{
c308c1b2 1380 struct sock *sk;
1da177e4 1381
154adbc8 1382 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1383 if (sk) {
154adbc8
PE		 1384 sk->sk_family = family;
1385 /*
1386 * See comment in struct sock definition to understand
1387 * why we need sk_prot_creator -acme
1388 */
1389 sk->sk_prot = sk->sk_prot_creator = prot;
1390 sock_lock_init(sk);
3b1e0a65 1391 sock_net_set(sk, get_net(net));
d66ee058 1392 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1393
211d2f97 1394 sock_update_classid(sk);
6ffd4641 1395 sock_update_netprioidx(sk);
1da177e4 1396 }
a79af59e 1397
2e4afe7b 1398 return sk;
1da177e4 1399}
2a91525c 1400EXPORT_SYMBOL(sk_alloc);
1da177e4 1401
2b85a34e 1402static void __sk_free(struct sock *sk)
1da177e4
LT		 1403{
1404 struct sk_filter *filter;
1da177e4
LT		 1405
1406 if (sk->sk_destruct)
1407 sk->sk_destruct(sk);
1408
a898def2
PM		 1409 filter = rcu_dereference_check(sk->sk_filter,
1410 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1411 if (filter) {
309dd5fc 1412 sk_filter_uncharge(sk, filter);
a9b3cd7f 1413 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1414 }
1415
08e29af3 1416 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1417
1418 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1419 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1420 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1421
109f6e39
EB		 1422 if (sk->sk_peer_cred)
1423 put_cred(sk->sk_peer_cred);
1424 put_pid(sk->sk_peer_pid);
3b1e0a65 1425 put_net(sock_net(sk));
c308c1b2 1426 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1427}
2b85a34e
ED		 1428
1429void sk_free(struct sock *sk)
1430{
1431 /*
25985edc 1432 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1433 * some packets are still in some tx queue.
1434 * If not null, sock_wfree() will call __sk_free(sk) later
1435 */
1436 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1437 __sk_free(sk);
1438}
2a91525c 1439EXPORT_SYMBOL(sk_free);
1da177e4 1440
edf02087 1441/*
25985edc
LDM		 1442 * Last sock_put should drop reference to sk->sk_net. It has already
1443 * been dropped in sk_change_net. Taking reference to stopping namespace
edf02087 1444 * is not an option.
25985edc 1445 * Take reference to a socket to remove it from hash _alive_ and after that
edf02087
DL		 1446 * destroy it in the context of init_net.
1447 */
1448void sk_release_kernel(struct sock *sk)
1449{
1450 if (sk == NULL || sk->sk_socket == NULL)
1451 return;
1452
1453 sock_hold(sk);
1454 sock_release(sk->sk_socket);
65a18ec5 1455 release_net(sock_net(sk));
3b1e0a65 1456 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1457 sock_put(sk);
1458}
45af1754 1459EXPORT_SYMBOL(sk_release_kernel);
edf02087 1460
475f1b52
SR		 1461static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1462{
1463 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1464 sock_update_memcg(newsk);
1465}
1466
e56c57d0
ED		 1467/**
1468 * sk_clone_lock - clone a socket, and lock its clone
1469 * @sk: the socket to clone
1470 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1471 *
1472 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1473 */
1474struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1475{
8fd1d178 1476 struct sock *newsk;
278571ba 1477 bool is_charged = true;
87d11ceb 1478
8fd1d178 1479 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1480 if (newsk != NULL) {
1481 struct sk_filter *filter;
1482
892c141e 1483 sock_copy(newsk, sk);
87d11ceb
ACM		 1484
1485 /* SANITY */
3b1e0a65 1486 get_net(sock_net(newsk));
87d11ceb
ACM		 1487 sk_node_init(&newsk->sk_node);
1488 sock_lock_init(newsk);
1489 bh_lock_sock(newsk);
fa438ccf 1490 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1491 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1492
1493 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1494 /*
1495 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1496 */
1497 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1498 atomic_set(&newsk->sk_omem_alloc, 0);
1499 skb_queue_head_init(&newsk->sk_receive_queue);
1500 skb_queue_head_init(&newsk->sk_write_queue);
1501
b6c6712a 1502 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1503 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1504 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1505 af_callback_keys + newsk->sk_family,
1506 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1507
1508 newsk->sk_dst_cache = NULL;
1509 newsk->sk_wmem_queued = 0;
1510 newsk->sk_forward_alloc = 0;
1511 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1512 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1513
1514 sock_reset_flag(newsk, SOCK_DONE);
1515 skb_queue_head_init(&newsk->sk_error_queue);
1516
0d7da9dd 1517 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb 1518 if (filter != NULL)
278571ba
AS		 1519 /* though it's an empty new sock, the charging may fail
1520 * if sysctl_optmem_max was changed between creation of
1521 * original socket and cloning
1522 */
1523 is_charged = sk_filter_charge(newsk, filter);
87d11ceb 1524
278571ba 1525 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk))) {
87d11ceb
ACM		 1526 /* It is still raw copy of parent, so invalidate
1527 * destructor and make plain sk_free() */
1528 newsk->sk_destruct = NULL;
b0691c8e 1529 bh_unlock_sock(newsk);
87d11ceb
ACM		 1530 sk_free(newsk);
1531 newsk = NULL;
1532 goto out;
1533 }
1534
1535 newsk->sk_err = 0;
1536 newsk->sk_priority = 0;
2c8c56e1 1537 newsk->sk_incoming_cpu = raw_smp_processor_id();
4dc6dc71
ED		 1538 /*
1539 * Before updating sk_refcnt, we must commit prior changes to memory
1540 * (Documentation/RCU/rculist_nulls.txt for details)
1541 */
1542 smp_wmb();
87d11ceb
ACM		 1543 atomic_set(&newsk->sk_refcnt, 2);
1544
1545 /*
1546 * Increment the counter in the same struct proto as the master
1547 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1548 * is the same as sk->sk_prot->socks, as this field was copied
1549 * with memcpy).
1550 *
1551 * This _changes_ the previous behaviour, where
1552 * tcp_create_openreq_child always was incrementing the
1553 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1554 * to be taken into account in all callers. -acme
1555 */
1556 sk_refcnt_debug_inc(newsk);
972692e0 1557 sk_set_socket(newsk, NULL);
43815482 1558 newsk->sk_wq = NULL;
87d11ceb 1559
f3f511e1
GC		 1560 sk_update_clone(sk, newsk);
1561
87d11ceb 1562 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1563 sk_sockets_allocated_inc(newsk);
704da560 1564
08e29af3 1565 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1566 net_enable_timestamp();
87d11ceb
ACM		 1567 }
1568out:
1569 return newsk;
1570}
e56c57d0 1571EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1572
9958089a
AK		 1573void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1574{
1575 __sk_dst_set(sk, dst);
1576 sk->sk_route_caps = dst->dev->features;
1577 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1578 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1579 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1580 if (sk_can_gso(sk)) {
82cc1a7a 1581 if (dst->header_len) {
9958089a 1582 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1583 } else {
9958089a 1584 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1585 sk->sk_gso_max_size = dst->dev->gso_max_size;
1485348d 1586 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
82cc1a7a 1587 }
9958089a
AK		 1588 }
1589}
1590EXPORT_SYMBOL_GPL(sk_setup_caps);
1591
1da177e4
LT		 1592/*
1593 * Simple resource managers for sockets.
1594 */
1595
1596
4ec93edb
YH		 1597/*
1598 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1599 */
1600void sock_wfree(struct sk_buff *skb)
1601{
1602 struct sock *sk = skb->sk;
d99927f4 1603 unsigned int len = skb->truesize;
1da177e4 1604
d99927f4
ED		 1605 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1606 /*
1607 * Keep a reference on sk_wmem_alloc, this will be released
1608 * after sk_write_space() call
1609 */
1610 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1611 sk->sk_write_space(sk);
d99927f4
ED		 1612 len = 1;
1613 }
2b85a34e 1614 /*
d99927f4
ED		 1615 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1616 * could not do because of in-flight packets
2b85a34e 1617 */
d99927f4 1618 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1619 __sk_free(sk);
1da177e4 1620}
2a91525c 1621EXPORT_SYMBOL(sock_wfree);
1da177e4 1622
f2f872f9
ED		 1623void skb_orphan_partial(struct sk_buff *skb)
1624{
1625 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1626 * so we do not completely orphan skb, but transfert all
1627 * accounted bytes but one, to avoid unexpected reorders.
1628 */
1629 if (skb->destructor == sock_wfree
1630#ifdef CONFIG_INET
1631 || skb->destructor == tcp_wfree
1632#endif
1633 ) {
1634 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1635 skb->truesize = 1;
1636 } else {
1637 skb_orphan(skb);
1638 }
1639}
1640EXPORT_SYMBOL(skb_orphan_partial);
1641
4ec93edb
YH		 1642/*
1643 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1644 */
1645void sock_rfree(struct sk_buff *skb)
1646{
1647 struct sock *sk = skb->sk;
d361fd59 1648 unsigned int len = skb->truesize;
1da177e4 1649
d361fd59
ED		 1650 atomic_sub(len, &sk->sk_rmem_alloc);
1651 sk_mem_uncharge(sk, len);
1da177e4 1652}
2a91525c 1653EXPORT_SYMBOL(sock_rfree);
1da177e4 1654
62bccb8c
AD		 1655void sock_efree(struct sk_buff *skb)
1656{
1657 sock_put(skb->sk);
1658}
1659EXPORT_SYMBOL(sock_efree);
1660
82eabd9e 1661#ifdef CONFIG_INET
41063e9d
DM		 1662void sock_edemux(struct sk_buff *skb)
1663{
e812347c
ED		 1664 struct sock *sk = skb->sk;
1665
1666 if (sk->sk_state == TCP_TIME_WAIT)
1667 inet_twsk_put(inet_twsk(sk));
1668 else
1669 sock_put(sk);
41063e9d
DM		 1670}
1671EXPORT_SYMBOL(sock_edemux);
82eabd9e 1672#endif
1da177e4 1673
976d0201 1674kuid_t sock_i_uid(struct sock *sk)
1da177e4 1675{
976d0201 1676 kuid_t uid;
1da177e4 1677
f064af1e 1678 read_lock_bh(&sk->sk_callback_lock);
976d0201 1679 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1680 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1681 return uid;
1682}
2a91525c 1683EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1684
1685unsigned long sock_i_ino(struct sock *sk)
1686{
1687 unsigned long ino;
1688
f064af1e 1689 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1690 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1691 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1692 return ino;
1693}
2a91525c 1694EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1695
1696/*
1697 * Allocate a skb from the socket's send buffer.
1698 */
86a76caf 1699struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1700 gfp_t priority)
1da177e4
LT		 1701{
1702 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1703 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1704 if (skb) {
1705 skb_set_owner_w(skb, sk);
1706 return skb;
1707 }
1708 }
1709 return NULL;
1710}
2a91525c 1711EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1712
4ec93edb 1713/*
1da177e4 1714 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1715 */
dd0fc66f 1716void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1717{
95c96174 1718 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1719 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1720 void *mem;
1721 /* First do the add, to avoid the race if kmalloc
4ec93edb 1722 * might sleep.
1da177e4
LT		 1723 */
1724 atomic_add(size, &sk->sk_omem_alloc);
1725 mem = kmalloc(size, priority);
1726 if (mem)
1727 return mem;
1728 atomic_sub(size, &sk->sk_omem_alloc);
1729 }
1730 return NULL;
1731}
2a91525c 1732EXPORT_SYMBOL(sock_kmalloc);
1da177e4 1733
79e88659
DB		 1734/* Free an option memory block. Note, we actually want the inline
1735 * here as this allows gcc to detect the nullify and fold away the
1736 * condition entirely.
1da177e4 1737 */
79e88659
DB		 1738static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1739 const bool nullify)
1da177e4 1740{
e53da5fb
DM		 1741 if (WARN_ON_ONCE(!mem))
1742 return;
79e88659
DB		 1743 if (nullify)
1744 kzfree(mem);
1745 else
1746 kfree(mem);
1da177e4
LT		 1747 atomic_sub(size, &sk->sk_omem_alloc);
1748}
79e88659
DB		 1749
1750void sock_kfree_s(struct sock *sk, void *mem, int size)
1751{
1752 __sock_kfree_s(sk, mem, size, false);
1753}
2a91525c 1754EXPORT_SYMBOL(sock_kfree_s);
1da177e4 1755
79e88659
DB		 1756void sock_kzfree_s(struct sock *sk, void *mem, int size)
1757{
1758 __sock_kfree_s(sk, mem, size, true);
1759}
1760EXPORT_SYMBOL(sock_kzfree_s);
1761
1da177e4
LT		 1762/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1763 I think, these locks should be removed for datagram sockets.
1764 */
2a91525c 1765static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1766{
1767 DEFINE_WAIT(wait);
1768
1769 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1770 for (;;) {
1771 if (!timeo)
1772 break;
1773 if (signal_pending(current))
1774 break;
1775 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1776 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1777 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1778 break;
1779 if (sk->sk_shutdown & SEND_SHUTDOWN)
1780 break;
1781 if (sk->sk_err)
1782 break;
1783 timeo = schedule_timeout(timeo);
1784 }
aa395145 1785 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1786 return timeo;
1787}
1788
1789
1790/*
1791 * Generic send/receive buffer handlers
1792 */
1793
4cc7f68d
HX		 1794struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1795 unsigned long data_len, int noblock,
28d64271 1796 int *errcode, int max_page_order)
1da177e4 1797{
2e4e4410 1798 struct sk_buff *skb;
1da177e4
LT		 1799 long timeo;
1800 int err;
1801
1da177e4 1802 timeo = sock_sndtimeo(sk, noblock);
2e4e4410 1803 for (;;) {
1da177e4
LT		 1804 err = sock_error(sk);
1805 if (err != 0)
1806 goto failure;
1807
1808 err = -EPIPE;
1809 if (sk->sk_shutdown & SEND_SHUTDOWN)
1810 goto failure;
1811
2e4e4410
ED		 1812 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
1813 break;
28d64271 1814
2e4e4410
ED		 1815 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1816 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1817 err = -EAGAIN;
1818 if (!timeo)
1da177e4 1819 goto failure;
2e4e4410
ED		 1820 if (signal_pending(current))
1821 goto interrupted;
1822 timeo = sock_wait_for_wmem(sk, timeo);
1da177e4 1823 }
2e4e4410
ED		 1824 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
1825 errcode, sk->sk_allocation);
1826 if (skb)
1827 skb_set_owner_w(skb, sk);
1da177e4
LT		 1828 return skb;
1829
1830interrupted:
1831 err = sock_intr_errno(timeo);
1832failure:
1833 *errcode = err;
1834 return NULL;
1835}
4cc7f68d 1836EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1837
4ec93edb 1838struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1839 int noblock, int *errcode)
1840{
28d64271 1841 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1842}
2a91525c 1843EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1844
5640f768
ED		 1845/* On 32bit arches, an skb frag is limited to 2^15 */
1846#define SKB_FRAG_PAGE_ORDER get_order(32768)
1847
400dfd3a
ED		 1848/**
1849 * skb_page_frag_refill - check that a page_frag contains enough room
1850 * @sz: minimum size of the fragment we want to get
1851 * @pfrag: pointer to page_frag
82d5e2b8 1852 * @gfp: priority for memory allocation
400dfd3a
ED		 1853 *
1854 * Note: While this allocator tries to use high order pages, there is
1855 * no guarantee that allocations succeed. Therefore, @sz MUST be
1856 * less or equal than PAGE_SIZE.
1857 */
d9b2938a 1858bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 1859{
5640f768
ED		 1860 if (pfrag->page) {
1861 if (atomic_read(&pfrag->page->_count) == 1) {
1862 pfrag->offset = 0;
1863 return true;
1864 }
400dfd3a 1865 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1866 return true;
1867 put_page(pfrag->page);
1868 }
1869
d9b2938a
ED		 1870 pfrag->offset = 0;
1871 if (SKB_FRAG_PAGE_ORDER) {
1872 pfrag->page = alloc_pages(gfp | __GFP_COMP |
1873 __GFP_NOWARN | __GFP_NORETRY,
1874 SKB_FRAG_PAGE_ORDER);
5640f768 1875 if (likely(pfrag->page)) {
d9b2938a 1876 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 1877 return true;
1878 }
d9b2938a
ED		 1879 }
1880 pfrag->page = alloc_page(gfp);
1881 if (likely(pfrag->page)) {
1882 pfrag->size = PAGE_SIZE;
1883 return true;
1884 }
400dfd3a
ED		 1885 return false;
1886}
1887EXPORT_SYMBOL(skb_page_frag_refill);
1888
1889bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1890{
1891 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1892 return true;
1893
5640f768
ED		 1894 sk_enter_memory_pressure(sk);
1895 sk_stream_moderate_sndbuf(sk);
1896 return false;
1897}
1898EXPORT_SYMBOL(sk_page_frag_refill);
1899
1da177e4 1900static void __lock_sock(struct sock *sk)
f39234d6
NK		 1901 __releases(&sk->sk_lock.slock)
1902 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1903{
1904 DEFINE_WAIT(wait);
1905
e71a4783 1906 for (;;) {
1da177e4
LT		 1907 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1908 TASK_UNINTERRUPTIBLE);
1909 spin_unlock_bh(&sk->sk_lock.slock);
1910 schedule();
1911 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1912 if (!sock_owned_by_user(sk))
1da177e4
LT		 1913 break;
1914 }
1915 finish_wait(&sk->sk_lock.wq, &wait);
1916}
1917
1918static void __release_sock(struct sock *sk)
f39234d6
NK		 1919 __releases(&sk->sk_lock.slock)
1920 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1921{
1922 struct sk_buff *skb = sk->sk_backlog.head;
1923
1924 do {
1925 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1926 bh_unlock_sock(sk);
1927
1928 do {
1929 struct sk_buff *next = skb->next;
1930
e4cbb02a 1931 prefetch(next);
7fee226a 1932 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1933 skb->next = NULL;
c57943a1 1934 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1935
1936 /*
1937 * We are in process context here with softirqs
1938 * disabled, use cond_resched_softirq() to preempt.
1939 * This is safe to do because we've taken the backlog
1940 * queue private:
1941 */
1942 cond_resched_softirq();
1943
1944 skb = next;
1945 } while (skb != NULL);
1946
1947 bh_lock_sock(sk);
e71a4783 1948 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1949
1950 /*
1951 * Doing the zeroing here guarantee we can not loop forever
1952 * while a wild producer attempts to flood us.
1953 */
1954 sk->sk_backlog.len = 0;
1da177e4
LT		 1955}
1956
1957/**
1958 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1959 * @sk: sock to wait on
1960 * @timeo: for how long
1da177e4
LT		 1961 *
1962 * Now socket state including sk->sk_err is changed only under lock,
1963 * hence we may omit checks after joining wait queue.
1964 * We check receive queue before schedule() only as optimization;
1965 * it is very likely that release_sock() added new data.
1966 */
1967int sk_wait_data(struct sock *sk, long *timeo)
1968{
1969 int rc;
1970 DEFINE_WAIT(wait);
1971
aa395145 1972 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1973 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1974 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1975 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1976 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1977 return rc;
1978}
1da177e4
LT		 1979EXPORT_SYMBOL(sk_wait_data);
1980
3ab224be
HA		 1981/**
1982 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1983 * @sk: socket
1984 * @size: memory size to allocate
1985 * @kind: allocation type
1986 *
1987 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1988 * rmem allocation. This function assumes that protocols which have
1989 * memory_pressure use sk_wmem_queued as write buffer accounting.
1990 */
1991int __sk_mem_schedule(struct sock *sk, int size, int kind)
1992{
1993 struct proto *prot = sk->sk_prot;
1994 int amt = sk_mem_pages(size);
8d987e5c 1995 long allocated;
e1aab161 1996 int parent_status = UNDER_LIMIT;
3ab224be
HA		 1997
1998 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 1999
e1aab161 2000 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 2001
2002 /* Under limit. */
e1aab161
GC		 2003 if (parent_status == UNDER_LIMIT &&
2004 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2005 sk_leave_memory_pressure(sk);
3ab224be
HA		 2006 return 1;
2007 }
2008
e1aab161
GC		 2009 /* Under pressure. (we or our parents) */
2010 if ((parent_status > SOFT_LIMIT) ||
2011 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2012 sk_enter_memory_pressure(sk);
3ab224be 2013
e1aab161
GC		 2014 /* Over hard limit (we or our parents) */
2015 if ((parent_status == OVER_LIMIT) ||
2016 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 2017 goto suppress_allocation;
2018
2019 /* guarantee minimum buffer size under pressure */
2020 if (kind == SK_MEM_RECV) {
2021 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2022 return 1;
180d8cd9 2023
3ab224be
HA		 2024 } else { /* SK_MEM_SEND */
2025 if (sk->sk_type == SOCK_STREAM) {
2026 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2027 return 1;
2028 } else if (atomic_read(&sk->sk_wmem_alloc) <
2029 prot->sysctl_wmem[0])
2030 return 1;
2031 }
2032
180d8cd9 2033 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2034 int alloc;
2035
180d8cd9 2036 if (!sk_under_memory_pressure(sk))
1748376b 2037 return 1;
180d8cd9
GC		 2038 alloc = sk_sockets_allocated_read_positive(sk);
2039 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2040 sk_mem_pages(sk->sk_wmem_queued +
2041 atomic_read(&sk->sk_rmem_alloc) +
2042 sk->sk_forward_alloc))
2043 return 1;
2044 }
2045
2046suppress_allocation:
2047
2048 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2049 sk_stream_moderate_sndbuf(sk);
2050
2051 /* Fail only if socket is _under_ its sndbuf.
2052 * In this case we cannot block, so that we have to fail.
2053 */
2054 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2055 return 1;
2056 }
2057
3847ce32
SM		 2058 trace_sock_exceed_buf_limit(sk, prot, allocated);
2059
3ab224be
HA		 2060 /* Alas. Undo changes. */
2061 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2062
0e90b31f 2063 sk_memory_allocated_sub(sk, amt);
180d8cd9 2064
3ab224be
HA		 2065 return 0;
2066}
3ab224be
HA		 2067EXPORT_SYMBOL(__sk_mem_schedule);
2068
2069/**
2070 * __sk_reclaim - reclaim memory_allocated
2071 * @sk: socket
2072 */
2073void __sk_mem_reclaim(struct sock *sk)
2074{
180d8cd9 2075 sk_memory_allocated_sub(sk,
0e90b31f 2076 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
3ab224be
HA		 2077 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
2078
180d8cd9
GC		 2079 if (sk_under_memory_pressure(sk) &&
2080 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2081 sk_leave_memory_pressure(sk);
3ab224be 2082}
3ab224be
HA		 2083EXPORT_SYMBOL(__sk_mem_reclaim);
2084
2085
1da177e4
LT		 2086/*
2087 * Set of default routines for initialising struct proto_ops when
2088 * the protocol does not support a particular function. In certain
2089 * cases where it makes no sense for a protocol to have a "do nothing"
2090 * function, some default processing is provided.
2091 */
2092
2093int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2094{
2095 return -EOPNOTSUPP;
2096}
2a91525c 2097EXPORT_SYMBOL(sock_no_bind);
1da177e4 2098
4ec93edb 2099int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2100 int len, int flags)
2101{
2102 return -EOPNOTSUPP;
2103}
2a91525c 2104EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2105
2106int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2107{
2108 return -EOPNOTSUPP;
2109}
2a91525c 2110EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2111
2112int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2113{
2114 return -EOPNOTSUPP;
2115}
2a91525c 2116EXPORT_SYMBOL(sock_no_accept);
1da177e4 2117
4ec93edb 2118int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2119 int *len, int peer)
2120{
2121 return -EOPNOTSUPP;
2122}
2a91525c 2123EXPORT_SYMBOL(sock_no_getname);
1da177e4 2124
2a91525c 2125unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2126{
2127 return 0;
2128}
2a91525c 2129EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2130
2131int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2132{
2133 return -EOPNOTSUPP;
2134}
2a91525c 2135EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2136
2137int sock_no_listen(struct socket *sock, int backlog)
2138{
2139 return -EOPNOTSUPP;
2140}
2a91525c 2141EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2142
2143int sock_no_shutdown(struct socket *sock, int how)
2144{
2145 return -EOPNOTSUPP;
2146}
2a91525c 2147EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2148
2149int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2150 char __user *optval, unsigned int optlen)
1da177e4
LT		 2151{
2152 return -EOPNOTSUPP;
2153}
2a91525c 2154EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2155
2156int sock_no_getsockopt(struct socket *sock, int level, int optname,
2157 char __user *optval, int __user *optlen)
2158{
2159 return -EOPNOTSUPP;
2160}
2a91525c 2161EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 2162
2163int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2164 size_t len)
2165{
2166 return -EOPNOTSUPP;
2167}
2a91525c 2168EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 2169
2170int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2171 size_t len, int flags)
2172{
2173 return -EOPNOTSUPP;
2174}
2a91525c 2175EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2176
2177int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2178{
2179 /* Mirror missing mmap method error code */
2180 return -ENODEV;
2181}
2a91525c 2182EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2183
2184ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2185{
2186 ssize_t res;
2187 struct msghdr msg = {.msg_flags = flags};
2188 struct kvec iov;
2189 char *kaddr = kmap(page);
2190 iov.iov_base = kaddr + offset;
2191 iov.iov_len = size;
2192 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2193 kunmap(page);
2194 return res;
2195}
2a91525c 2196EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2197
2198/*
2199 * Default Socket Callbacks
2200 */
2201
2202static void sock_def_wakeup(struct sock *sk)
2203{
43815482
ED		 2204 struct socket_wq *wq;
2205
2206 rcu_read_lock();
2207 wq = rcu_dereference(sk->sk_wq);
2208 if (wq_has_sleeper(wq))
2209 wake_up_interruptible_all(&wq->wait);
2210 rcu_read_unlock();
1da177e4
LT		 2211}
2212
2213static void sock_def_error_report(struct sock *sk)
2214{
43815482
ED		 2215 struct socket_wq *wq;
2216
2217 rcu_read_lock();
2218 wq = rcu_dereference(sk->sk_wq);
2219 if (wq_has_sleeper(wq))
2220 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2221 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2222 rcu_read_unlock();
1da177e4
LT		 2223}
2224
676d2369 2225static void sock_def_readable(struct sock *sk)
1da177e4 2226{
43815482
ED		 2227 struct socket_wq *wq;
2228
2229 rcu_read_lock();
2230 wq = rcu_dereference(sk->sk_wq);
2231 if (wq_has_sleeper(wq))
2c6607c6 2232 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2233 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2234 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2235 rcu_read_unlock();
1da177e4
LT		 2236}
2237
2238static void sock_def_write_space(struct sock *sk)
2239{
43815482
ED		 2240 struct socket_wq *wq;
2241
2242 rcu_read_lock();
1da177e4
LT		 2243
2244 /* Do not wake up a writer until he can make "significant"
2245 * progress. --DaveM
2246 */
e71a4783 2247 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2248 wq = rcu_dereference(sk->sk_wq);
2249 if (wq_has_sleeper(wq))
2250 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2251 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2252
2253 /* Should agree with poll, otherwise some programs break */
2254 if (sock_writeable(sk))
8d8ad9d7 2255 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2256 }
2257
43815482 2258 rcu_read_unlock();
1da177e4
LT		 2259}
2260
2261static void sock_def_destruct(struct sock *sk)
2262{
a51482bd 2263 kfree(sk->sk_protinfo);
1da177e4
LT		 2264}
2265
2266void sk_send_sigurg(struct sock *sk)
2267{
2268 if (sk->sk_socket && sk->sk_socket->file)
2269 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2270 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2271}
2a91525c 2272EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2273
2274void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2275 unsigned long expires)
2276{
2277 if (!mod_timer(timer, expires))
2278 sock_hold(sk);
2279}
1da177e4
LT		 2280EXPORT_SYMBOL(sk_reset_timer);
2281
2282void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2283{
25cc4ae9 2284 if (del_timer(timer))
1da177e4
LT		 2285 __sock_put(sk);
2286}
1da177e4
LT		 2287EXPORT_SYMBOL(sk_stop_timer);
2288
2289void sock_init_data(struct socket *sock, struct sock *sk)
2290{
2291 skb_queue_head_init(&sk->sk_receive_queue);
2292 skb_queue_head_init(&sk->sk_write_queue);
2293 skb_queue_head_init(&sk->sk_error_queue);
2294
2295 sk->sk_send_head = NULL;
2296
2297 init_timer(&sk->sk_timer);
4ec93edb 2298
1da177e4
LT		 2299 sk->sk_allocation = GFP_KERNEL;
2300 sk->sk_rcvbuf = sysctl_rmem_default;
2301 sk->sk_sndbuf = sysctl_wmem_default;
2302 sk->sk_state = TCP_CLOSE;
972692e0 2303 sk_set_socket(sk, sock);
1da177e4
LT		 2304
2305 sock_set_flag(sk, SOCK_ZAPPED);
2306
e71a4783 2307 if (sock) {
1da177e4 2308 sk->sk_type = sock->type;
43815482 2309 sk->sk_wq = sock->wq;
1da177e4
LT		 2310 sock->sk = sk;
2311 } else
43815482 2312 sk->sk_wq = NULL;
1da177e4 2313
b6c6712a 2314 spin_lock_init(&sk->sk_dst_lock);
1da177e4 2315 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2316 lockdep_set_class_and_name(&sk->sk_callback_lock,
2317 af_callback_keys + sk->sk_family,
2318 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2319
2320 sk->sk_state_change = sock_def_wakeup;
2321 sk->sk_data_ready = sock_def_readable;
2322 sk->sk_write_space = sock_def_write_space;
2323 sk->sk_error_report = sock_def_error_report;
2324 sk->sk_destruct = sock_def_destruct;
2325
5640f768
ED		 2326 sk->sk_frag.page = NULL;
2327 sk->sk_frag.offset = 0;
ef64a54f 2328 sk->sk_peek_off = -1;
1da177e4 2329
109f6e39
EB		 2330 sk->sk_peer_pid = NULL;
2331 sk->sk_peer_cred = NULL;
1da177e4
LT		 2332 sk->sk_write_pending = 0;
2333 sk->sk_rcvlowat = 1;
2334 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2335 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2336
f37f0afb 2337 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2338
e0d1095a 2339#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2340 sk->sk_napi_id = 0;
64b0dc51 2341 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2342#endif
2343
62748f32 2344 sk->sk_max_pacing_rate = ~0U;
7eec4174 2345 sk->sk_pacing_rate = ~0U;
4dc6dc71
ED		 2346 /*
2347 * Before updating sk_refcnt, we must commit prior changes to memory
2348 * (Documentation/RCU/rculist_nulls.txt for details)
2349 */
2350 smp_wmb();
1da177e4 2351 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2352 atomic_set(&sk->sk_drops, 0);
1da177e4 2353}
2a91525c 2354EXPORT_SYMBOL(sock_init_data);
1da177e4 2355
b5606c2d 2356void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2357{
2358 might_sleep();
a5b5bb9a 2359 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2360 if (sk->sk_lock.owned)
1da177e4 2361 __lock_sock(sk);
d2e9117c 2362 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2363 spin_unlock(&sk->sk_lock.slock);
2364 /*
2365 * The sk_lock has mutex_lock() semantics here:
2366 */
fcc70d5f 2367 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2368 local_bh_enable();
1da177e4 2369}
fcc70d5f 2370EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2371
b5606c2d 2372void release_sock(struct sock *sk)
1da177e4 2373{
a5b5bb9a
IM		 2374 /*
2375 * The sk_lock has mutex_unlock() semantics:
2376 */
2377 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2378
2379 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2380 if (sk->sk_backlog.tail)
2381 __release_sock(sk);
46d3ceab 2382
c3f9b018
ED		 2383 /* Warning : release_cb() might need to release sk ownership,
2384 * ie call sock_release_ownership(sk) before us.
2385 */
46d3ceab
ED		 2386 if (sk->sk_prot->release_cb)
2387 sk->sk_prot->release_cb(sk);
2388
c3f9b018 2389 sock_release_ownership(sk);
a5b5bb9a
IM		 2390 if (waitqueue_active(&sk->sk_lock.wq))
2391 wake_up(&sk->sk_lock.wq);
2392 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2393}
2394EXPORT_SYMBOL(release_sock);
2395
8a74ad60
ED		 2396/**
2397 * lock_sock_fast - fast version of lock_sock
2398 * @sk: socket
2399 *
2400 * This version should be used for very small section, where process wont block
2401 * return false if fast path is taken
2402 * sk_lock.slock locked, owned = 0, BH disabled
2403 * return true if slow path is taken
2404 * sk_lock.slock unlocked, owned = 1, BH enabled
2405 */
2406bool lock_sock_fast(struct sock *sk)
2407{
2408 might_sleep();
2409 spin_lock_bh(&sk->sk_lock.slock);
2410
2411 if (!sk->sk_lock.owned)
2412 /*
2413 * Note : We must disable BH
2414 */
2415 return false;
2416
2417 __lock_sock(sk);
2418 sk->sk_lock.owned = 1;
2419 spin_unlock(&sk->sk_lock.slock);
2420 /*
2421 * The sk_lock has mutex_lock() semantics here:
2422 */
2423 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2424 local_bh_enable();
2425 return true;
2426}
2427EXPORT_SYMBOL(lock_sock_fast);
2428
1da177e4 2429int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2430{
b7aa0bf7 2431 struct timeval tv;
1da177e4 2432 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2433 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2434 tv = ktime_to_timeval(sk->sk_stamp);
2435 if (tv.tv_sec == -1)
1da177e4 2436 return -ENOENT;
b7aa0bf7
ED		 2437 if (tv.tv_sec == 0) {
2438 sk->sk_stamp = ktime_get_real();
2439 tv = ktime_to_timeval(sk->sk_stamp);
2440 }
2441 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2442}
1da177e4
LT		 2443EXPORT_SYMBOL(sock_get_timestamp);
2444
ae40eb1e
ED		 2445int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2446{
2447 struct timespec ts;
2448 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2449 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2450 ts = ktime_to_timespec(sk->sk_stamp);
2451 if (ts.tv_sec == -1)
2452 return -ENOENT;
2453 if (ts.tv_sec == 0) {
2454 sk->sk_stamp = ktime_get_real();
2455 ts = ktime_to_timespec(sk->sk_stamp);
2456 }
2457 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2458}
2459EXPORT_SYMBOL(sock_get_timestampns);
2460
20d49473 2461void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2462{
20d49473 2463 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2464 unsigned long previous_flags = sk->sk_flags;
2465
20d49473
PO		 2466 sock_set_flag(sk, flag);
2467 /*
2468 * we just set one of the two flags which require net
2469 * time stamping, but time stamping might have been on
2470 * already because of the other one
2471 */
08e29af3 2472 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2473 net_enable_timestamp();
1da177e4
LT		 2474 }
2475}
1da177e4 2476
cb820f8e
RC		 2477int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2478 int level, int type)
2479{
2480 struct sock_exterr_skb *serr;
364a9e93 2481 struct sk_buff *skb;
cb820f8e
RC		 2482 int copied, err;
2483
2484 err = -EAGAIN;
364a9e93 2485 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 2486 if (skb == NULL)
2487 goto out;
2488
2489 copied = skb->len;
2490 if (copied > len) {
2491 msg->msg_flags |= MSG_TRUNC;
2492 copied = len;
2493 }
51f3d02b 2494 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 2495 if (err)
2496 goto out_free_skb;
2497
2498 sock_recv_timestamp(msg, sk, skb);
2499
2500 serr = SKB_EXT_ERR(skb);
2501 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2502
2503 msg->msg_flags |= MSG_ERRQUEUE;
2504 err = copied;
2505
cb820f8e
RC		 2506out_free_skb:
2507 kfree_skb(skb);
2508out:
2509 return err;
2510}
2511EXPORT_SYMBOL(sock_recv_errqueue);
2512
1da177e4
LT		 2513/*
2514 * Get a socket option on an socket.
2515 *
2516 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2517 * asynchronous errors should be reported by getsockopt. We assume
2518 * this means if you specify SO_ERROR (otherwise whats the point of it).
2519 */
2520int sock_common_getsockopt(struct socket *sock, int level, int optname,
2521 char __user *optval, int __user *optlen)
2522{
2523 struct sock *sk = sock->sk;
2524
2525 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2526}
1da177e4
LT		 2527EXPORT_SYMBOL(sock_common_getsockopt);
2528
3fdadf7d 2529#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2530int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2531 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2532{
2533 struct sock *sk = sock->sk;
2534
1e51f951 2535 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2536 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2537 optval, optlen);
3fdadf7d
DM		 2538 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2539}
2540EXPORT_SYMBOL(compat_sock_common_getsockopt);
2541#endif
2542
1da177e4
LT		 2543int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2544 struct msghdr *msg, size_t size, int flags)
2545{
2546 struct sock *sk = sock->sk;
2547 int addr_len = 0;
2548 int err;
2549
2550 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2551 flags & ~MSG_DONTWAIT, &addr_len);
2552 if (err >= 0)
2553 msg->msg_namelen = addr_len;
2554 return err;
2555}
1da177e4
LT		 2556EXPORT_SYMBOL(sock_common_recvmsg);
2557
2558/*
2559 * Set socket options on an inet socket.
2560 */
2561int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2562 char __user *optval, unsigned int optlen)
1da177e4
LT		 2563{
2564 struct sock *sk = sock->sk;
2565
2566 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2567}
1da177e4
LT		 2568EXPORT_SYMBOL(sock_common_setsockopt);
2569
3fdadf7d 2570#ifdef CONFIG_COMPAT
543d9cfe 2571int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2572 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2573{
2574 struct sock *sk = sock->sk;
2575
543d9cfe
ACM		 2576 if (sk->sk_prot->compat_setsockopt != NULL)
2577 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2578 optval, optlen);
3fdadf7d
DM		 2579 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2580}
2581EXPORT_SYMBOL(compat_sock_common_setsockopt);
2582#endif
2583
1da177e4
LT		 2584void sk_common_release(struct sock *sk)
2585{
2586 if (sk->sk_prot->destroy)
2587 sk->sk_prot->destroy(sk);
2588
2589 /*
2590 * Observation: when sock_common_release is called, processes have
2591 * no access to socket. But net still has.
2592 * Step one, detach it from networking:
2593 *
2594 * A. Remove from hash tables.
2595 */
2596
2597 sk->sk_prot->unhash(sk);
2598
2599 /*
2600 * In this point socket cannot receive new packets, but it is possible
2601 * that some packets are in flight because some CPU runs receiver and
2602 * did hash table lookup before we unhashed socket. They will achieve
2603 * receive queue and will be purged by socket destructor.
2604 *
2605 * Also we still have packets pending on receive queue and probably,
2606 * our own packets waiting in device queues. sock_destroy will drain
2607 * receive queue, but transmitted packets will delay socket destruction
2608 * until the last reference will be released.
2609 */
2610
2611 sock_orphan(sk);
2612
2613 xfrm_sk_free_policy(sk);
2614
e6848976 2615 sk_refcnt_debug_release(sk);
5640f768
ED		 2616
2617 if (sk->sk_frag.page) {
2618 put_page(sk->sk_frag.page);
2619 sk->sk_frag.page = NULL;
2620 }
2621
1da177e4
LT		 2622 sock_put(sk);
2623}
1da177e4
LT		 2624EXPORT_SYMBOL(sk_common_release);
2625
13ff3d6f
PE		 2626#ifdef CONFIG_PROC_FS
2627#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2628struct prot_inuse {
2629 int val[PROTO_INUSE_NR];
2630};
13ff3d6f
PE		 2631
2632static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2633
2634#ifdef CONFIG_NET_NS
2635void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2636{
d6d9ca0f 2637 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2638}
2639EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2640
2641int sock_prot_inuse_get(struct net *net, struct proto *prot)
2642{
2643 int cpu, idx = prot->inuse_idx;
2644 int res = 0;
2645
2646 for_each_possible_cpu(cpu)
2647 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2648
2649 return res >= 0 ? res : 0;
2650}
2651EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2652
2c8c1e72 2653static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2654{
2655 net->core.inuse = alloc_percpu(struct prot_inuse);
2656 return net->core.inuse ? 0 : -ENOMEM;
2657}
2658
2c8c1e72 2659static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2660{
2661 free_percpu(net->core.inuse);
2662}
2663
2664static struct pernet_operations net_inuse_ops = {
2665 .init = sock_inuse_init_net,
2666 .exit = sock_inuse_exit_net,
2667};
2668
2669static __init int net_inuse_init(void)
2670{
2671 if (register_pernet_subsys(&net_inuse_ops))
2672 panic("Cannot initialize net inuse counters");
2673
2674 return 0;
2675}
2676
2677core_initcall(net_inuse_init);
2678#else
1338d466
PE		 2679static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2680
c29a0bc4 2681void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2682{
d6d9ca0f 2683 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2684}
2685EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2686
c29a0bc4 2687int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2688{
2689 int cpu, idx = prot->inuse_idx;
2690 int res = 0;
2691
2692 for_each_possible_cpu(cpu)
2693 res += per_cpu(prot_inuse, cpu).val[idx];
2694
2695 return res >= 0 ? res : 0;
2696}
2697EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2698#endif
13ff3d6f
PE		 2699
2700static void assign_proto_idx(struct proto *prot)
2701{
2702 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2703
2704 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2705 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2706 return;
2707 }
2708
2709 set_bit(prot->inuse_idx, proto_inuse_idx);
2710}
2711
2712static void release_proto_idx(struct proto *prot)
2713{
2714 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2715 clear_bit(prot->inuse_idx, proto_inuse_idx);
2716}
2717#else
2718static inline void assign_proto_idx(struct proto *prot)
2719{
2720}
2721
2722static inline void release_proto_idx(struct proto *prot)
2723{
2724}
2725#endif
2726
b733c007
PE		 2727int proto_register(struct proto *prot, int alloc_slab)
2728{
1da177e4
LT		 2729 if (alloc_slab) {
2730 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2731 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2732 NULL);
1da177e4
LT		 2733
2734 if (prot->slab == NULL) {
e005d193
JP		 2735 pr_crit("%s: Can't create sock SLAB cache!\n",
2736 prot->name);
60e7663d 2737 goto out;
1da177e4 2738 }
2e6599cb
ACM		 2739
2740 if (prot->rsk_prot != NULL) {
faf23422 2741 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2742 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2743 goto out_free_sock_slab;
2744
7e56b5d6 2745 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2746 prot->rsk_prot->obj_size, 0,
20c2df83 2747 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2748
2749 if (prot->rsk_prot->slab == NULL) {
e005d193
JP		 2750 pr_crit("%s: Can't create request sock SLAB cache!\n",
2751 prot->name);
2e6599cb
ACM		 2752 goto out_free_request_sock_slab_name;
2753 }
2754 }
8feaf0c0 2755
6d6ee43e 2756 if (prot->twsk_prot != NULL) {
faf23422 2757 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2758
7e56b5d6 2759 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2760 goto out_free_request_sock_slab;
2761
6d6ee43e 2762 prot->twsk_prot->twsk_slab =
7e56b5d6 2763 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2764 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2765 0,
2766 SLAB_HWCACHE_ALIGN |
2767 prot->slab_flags,
20c2df83 2768 NULL);
6d6ee43e 2769 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2770 goto out_free_timewait_sock_slab_name;
2771 }
1da177e4
LT		 2772 }
2773
36b77a52 2774 mutex_lock(&proto_list_mutex);
1da177e4 2775 list_add(&prot->node, &proto_list);
13ff3d6f 2776 assign_proto_idx(prot);
36b77a52 2777 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2778 return 0;
2779
8feaf0c0 2780out_free_timewait_sock_slab_name:
7e56b5d6 2781 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2782out_free_request_sock_slab:
2783 if (prot->rsk_prot && prot->rsk_prot->slab) {
2784 kmem_cache_destroy(prot->rsk_prot->slab);
2785 prot->rsk_prot->slab = NULL;
2786 }
2e6599cb 2787out_free_request_sock_slab_name:
72150e9b
DC		 2788 if (prot->rsk_prot)
2789 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2790out_free_sock_slab:
2791 kmem_cache_destroy(prot->slab);
2792 prot->slab = NULL;
b733c007
PE		 2793out:
2794 return -ENOBUFS;
1da177e4 2795}
1da177e4
LT		 2796EXPORT_SYMBOL(proto_register);
2797
2798void proto_unregister(struct proto *prot)
2799{
36b77a52 2800 mutex_lock(&proto_list_mutex);
13ff3d6f 2801 release_proto_idx(prot);
0a3f4358 2802 list_del(&prot->node);
36b77a52 2803 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2804
2805 if (prot->slab != NULL) {
2806 kmem_cache_destroy(prot->slab);
2807 prot->slab = NULL;
2808 }
2809
2e6599cb 2810 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2811 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2812 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2813 prot->rsk_prot->slab = NULL;
2814 }
2815
6d6ee43e 2816 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2817 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2818 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2819 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2820 }
1da177e4 2821}
1da177e4
LT		 2822EXPORT_SYMBOL(proto_unregister);
2823
2824#ifdef CONFIG_PROC_FS
1da177e4 2825static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2826 __acquires(proto_list_mutex)
1da177e4 2827{
36b77a52 2828 mutex_lock(&proto_list_mutex);
60f0438a 2829 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2830}
2831
2832static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2833{
60f0438a 2834 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2835}
2836
2837static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2838 __releases(proto_list_mutex)
1da177e4 2839{
36b77a52 2840 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2841}
2842
2843static char proto_method_implemented(const void *method)
2844{
2845 return method == NULL ? 'n' : 'y';
2846}
180d8cd9
GC		 2847static long sock_prot_memory_allocated(struct proto *proto)
2848{
cb75a36c 2849 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2850}
2851
2852static char *sock_prot_memory_pressure(struct proto *proto)
2853{
2854 return proto->memory_pressure != NULL ?
2855 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2856}
1da177e4
LT		 2857
2858static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2859{
180d8cd9 2860
8d987e5c 2861 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2862 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2863 proto->name,
2864 proto->obj_size,
14e943db 2865 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2866 sock_prot_memory_allocated(proto),
2867 sock_prot_memory_pressure(proto),
1da177e4
LT		 2868 proto->max_header,
2869 proto->slab == NULL ? "no" : "yes",
2870 module_name(proto->owner),
2871 proto_method_implemented(proto->close),
2872 proto_method_implemented(proto->connect),
2873 proto_method_implemented(proto->disconnect),
2874 proto_method_implemented(proto->accept),
2875 proto_method_implemented(proto->ioctl),
2876 proto_method_implemented(proto->init),
2877 proto_method_implemented(proto->destroy),
2878 proto_method_implemented(proto->shutdown),
2879 proto_method_implemented(proto->setsockopt),
2880 proto_method_implemented(proto->getsockopt),
2881 proto_method_implemented(proto->sendmsg),
2882 proto_method_implemented(proto->recvmsg),
2883 proto_method_implemented(proto->sendpage),
2884 proto_method_implemented(proto->bind),
2885 proto_method_implemented(proto->backlog_rcv),
2886 proto_method_implemented(proto->hash),
2887 proto_method_implemented(proto->unhash),
2888 proto_method_implemented(proto->get_port),
2889 proto_method_implemented(proto->enter_memory_pressure));
2890}
2891
2892static int proto_seq_show(struct seq_file *seq, void *v)
2893{
60f0438a 2894 if (v == &proto_list)
1da177e4
LT		 2895 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2896 "protocol",
2897 "size",
2898 "sockets",
2899 "memory",
2900 "press",
2901 "maxhdr",
2902 "slab",
2903 "module",
2904 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2905 else
60f0438a 2906 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2907 return 0;
2908}
2909
f690808e 2910static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2911 .start = proto_seq_start,
2912 .next = proto_seq_next,
2913 .stop = proto_seq_stop,
2914 .show = proto_seq_show,
2915};
2916
2917static int proto_seq_open(struct inode *inode, struct file *file)
2918{
14e943db
ED		 2919 return seq_open_net(inode, file, &proto_seq_ops,
2920 sizeof(struct seq_net_private));
1da177e4
LT		 2921}
2922
9a32144e 2923static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2924 .owner = THIS_MODULE,
2925 .open = proto_seq_open,
2926 .read = seq_read,
2927 .llseek = seq_lseek,
14e943db
ED		 2928 .release = seq_release_net,
2929};
2930
2931static __net_init int proto_init_net(struct net *net)
2932{
d4beaa66 2933 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 2934 return -ENOMEM;
2935
2936 return 0;
2937}
2938
2939static __net_exit void proto_exit_net(struct net *net)
2940{
ece31ffd 2941 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 2942}
2943
2944
2945static __net_initdata struct pernet_operations proto_net_ops = {
2946 .init = proto_init_net,
2947 .exit = proto_exit_net,
1da177e4
LT		 2948};
2949
2950static int __init proto_init(void)
2951{
14e943db 2952 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2953}
2954
2955subsys_initcall(proto_init);
2956
2957#endif /* PROC_FS */
Linux 6.x block layer and io_uring tree(s)