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net: Remove iocb argument from sendmsg and recvmsg
[deliverable/linux.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
4ec93edb 35 * code. The ACK stuff can wait and needs major
1da177e4
LT		 36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 *
85 *
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
90 */
91
e005d193
JP		 92#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
93
4fc268d2 94#include <linux/capability.h>
1da177e4 95#include <linux/errno.h>
cb820f8e 96#include <linux/errqueue.h>
1da177e4
LT		 97#include <linux/types.h>
98#include <linux/socket.h>
99#include <linux/in.h>
100#include <linux/kernel.h>
1da177e4
LT		 101#include <linux/module.h>
102#include <linux/proc_fs.h>
103#include <linux/seq_file.h>
104#include <linux/sched.h>
105#include <linux/timer.h>
106#include <linux/string.h>
107#include <linux/sockios.h>
108#include <linux/net.h>
109#include <linux/mm.h>
110#include <linux/slab.h>
111#include <linux/interrupt.h>
112#include <linux/poll.h>
113#include <linux/tcp.h>
114#include <linux/init.h>
a1f8e7f7 115#include <linux/highmem.h>
3f551f94 116#include <linux/user_namespace.h>
c5905afb 117#include <linux/static_key.h>
3969eb38 118#include <linux/memcontrol.h>
8c1ae10d 119#include <linux/prefetch.h>
1da177e4
LT		 120
121#include <asm/uaccess.h>
1da177e4
LT		 122
123#include <linux/netdevice.h>
124#include <net/protocol.h>
125#include <linux/skbuff.h>
457c4cbc 126#include <net/net_namespace.h>
2e6599cb 127#include <net/request_sock.h>
1da177e4 128#include <net/sock.h>
20d49473 129#include <linux/net_tstamp.h>
1da177e4
LT		 130#include <net/xfrm.h>
131#include <linux/ipsec.h>
f8451725 132#include <net/cls_cgroup.h>
5bc1421e 133#include <net/netprio_cgroup.h>
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
b245be1f
WB		 328int sysctl_tstamp_allow_data __read_mostly = 1;
329
c93bdd0e
MG		 330struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
331EXPORT_SYMBOL_GPL(memalloc_socks);
332
7cb02404
MG		 333/**
334 * sk_set_memalloc - sets %SOCK_MEMALLOC
335 * @sk: socket to set it on
336 *
337 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
338 * It's the responsibility of the admin to adjust min_free_kbytes
339 * to meet the requirements
340 */
341void sk_set_memalloc(struct sock *sk)
342{
343 sock_set_flag(sk, SOCK_MEMALLOC);
344 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 345 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 346}
347EXPORT_SYMBOL_GPL(sk_set_memalloc);
348
349void sk_clear_memalloc(struct sock *sk)
350{
351 sock_reset_flag(sk, SOCK_MEMALLOC);
352 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 353 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 354
355 /*
356 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
357 * progress of swapping. However, if SOCK_MEMALLOC is cleared while
358 * it has rmem allocations there is a risk that the user of the
359 * socket cannot make forward progress due to exceeding the rmem
360 * limits. By rights, sk_clear_memalloc() should only be called
361 * on sockets being torn down but warn and reset the accounting if
362 * that assumption breaks.
363 */
364 if (WARN_ON(sk->sk_forward_alloc))
365 sk_mem_reclaim(sk);
7cb02404
MG		 366}
367EXPORT_SYMBOL_GPL(sk_clear_memalloc);
368
b4b9e355
MG		 369int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
370{
371 int ret;
372 unsigned long pflags = current->flags;
373
374 /* these should have been dropped before queueing */
375 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
376
377 current->flags |= PF_MEMALLOC;
378 ret = sk->sk_backlog_rcv(sk, skb);
379 tsk_restore_flags(current, pflags, PF_MEMALLOC);
380
381 return ret;
382}
383EXPORT_SYMBOL(__sk_backlog_rcv);
384
1da177e4
LT		 385static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
386{
387 struct timeval tv;
388
389 if (optlen < sizeof(tv))
390 return -EINVAL;
391 if (copy_from_user(&tv, optval, sizeof(tv)))
392 return -EFAULT;
ba78073e
VA		 393 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
394 return -EDOM;
1da177e4 395
ba78073e 396 if (tv.tv_sec < 0) {
6f11df83
AM		 397 static int warned __read_mostly;
398
ba78073e 399 *timeo_p = 0;
50aab54f 400 if (warned < 10 && net_ratelimit()) {
ba78073e 401 warned++;
e005d193
JP		 402 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
403 __func__, current->comm, task_pid_nr(current));
50aab54f 404 }
ba78073e
VA		 405 return 0;
406 }
1da177e4
LT		 407 *timeo_p = MAX_SCHEDULE_TIMEOUT;
408 if (tv.tv_sec == 0 && tv.tv_usec == 0)
409 return 0;
410 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
411 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
412 return 0;
413}
414
415static void sock_warn_obsolete_bsdism(const char *name)
416{
417 static int warned;
418 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 419 if (strcmp(warncomm, current->comm) && warned < 5) {
420 strcpy(warncomm, current->comm);
e005d193
JP		 421 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
422 warncomm, name);
1da177e4
LT		 423 warned++;
424 }
425}
426
08e29af3
ED		 427#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
428
429static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 430{
08e29af3
ED		 431 if (sk->sk_flags & flags) {
432 sk->sk_flags &= ~flags;
433 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 434 net_disable_timestamp();
1da177e4
LT		 435 }
436}
437
438
f0088a50
DV		 439int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
440{
766e9037 441 int err;
3b885787
NH		 442 unsigned long flags;
443 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 444
0fd7bac6 445 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 446 atomic_inc(&sk->sk_drops);
3847ce32 447 trace_sock_rcvqueue_full(sk, skb);
766e9037 448 return -ENOMEM;
f0088a50
DV		 449 }
450
fda9ef5d 451 err = sk_filter(sk, skb);
f0088a50 452 if (err)
766e9037 453 return err;
f0088a50 454
c76562b6 455 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 456 atomic_inc(&sk->sk_drops);
457 return -ENOBUFS;
3ab224be
HA		 458 }
459
f0088a50
DV		 460 skb->dev = NULL;
461 skb_set_owner_r(skb, sk);
49ad9599 462
7fee226a
ED		 463 /* we escape from rcu protected region, make sure we dont leak
464 * a norefcounted dst
465 */
466 skb_dst_force(skb);
467
3b885787 468 spin_lock_irqsave(&list->lock, flags);
3bc3b96f 469 sock_skb_set_dropcount(sk, skb);
3b885787
NH		 470 __skb_queue_tail(list, skb);
471 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 472
473 if (!sock_flag(sk, SOCK_DEAD))
676d2369 474 sk->sk_data_ready(sk);
766e9037 475 return 0;
f0088a50
DV		 476}
477EXPORT_SYMBOL(sock_queue_rcv_skb);
478
58a5a7b9 479int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 480{
481 int rc = NET_RX_SUCCESS;
482
fda9ef5d 483 if (sk_filter(sk, skb))
f0088a50
DV		 484 goto discard_and_relse;
485
486 skb->dev = NULL;
487
274f482d 488 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 489 atomic_inc(&sk->sk_drops);
490 goto discard_and_relse;
491 }
58a5a7b9
ACM		 492 if (nested)
493 bh_lock_sock_nested(sk);
494 else
495 bh_lock_sock(sk);
a5b5bb9a
IM		 496 if (!sock_owned_by_user(sk)) {
497 /*
498 * trylock + unlock semantics:
499 */
500 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
501
c57943a1 502 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 503
504 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 505 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 506 bh_unlock_sock(sk);
507 atomic_inc(&sk->sk_drops);
508 goto discard_and_relse;
509 }
510
f0088a50
DV		 511 bh_unlock_sock(sk);
512out:
513 sock_put(sk);
514 return rc;
515discard_and_relse:
516 kfree_skb(skb);
517 goto out;
518}
519EXPORT_SYMBOL(sk_receive_skb);
520
521struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
522{
b6c6712a 523 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 524
525 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 526 sk_tx_queue_clear(sk);
a9b3cd7f 527 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 528 dst_release(dst);
529 return NULL;
530 }
531
532 return dst;
533}
534EXPORT_SYMBOL(__sk_dst_check);
535
536struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
537{
538 struct dst_entry *dst = sk_dst_get(sk);
539
540 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
541 sk_dst_reset(sk);
542 dst_release(dst);
543 return NULL;
544 }
545
546 return dst;
547}
548EXPORT_SYMBOL(sk_dst_check);
549
c91f6df2
BH		 550static int sock_setbindtodevice(struct sock *sk, char __user *optval,
551 int optlen)
4878809f
DM		 552{
553 int ret = -ENOPROTOOPT;
554#ifdef CONFIG_NETDEVICES
3b1e0a65 555 struct net *net = sock_net(sk);
4878809f
DM		 556 char devname[IFNAMSIZ];
557 int index;
558
559 /* Sorry... */
560 ret = -EPERM;
5e1fccc0 561 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 562 goto out;
563
564 ret = -EINVAL;
565 if (optlen < 0)
566 goto out;
567
568 /* Bind this socket to a particular device like "eth0",
569 * as specified in the passed interface name. If the
570 * name is "" or the option length is zero the socket
571 * is not bound.
572 */
573 if (optlen > IFNAMSIZ - 1)
574 optlen = IFNAMSIZ - 1;
575 memset(devname, 0, sizeof(devname));
576
577 ret = -EFAULT;
578 if (copy_from_user(devname, optval, optlen))
579 goto out;
580
000ba2e4
DM		 581 index = 0;
582 if (devname[0] != '\0') {
bf8e56bf 583 struct net_device *dev;
4878809f 584
bf8e56bf
ED		 585 rcu_read_lock();
586 dev = dev_get_by_name_rcu(net, devname);
587 if (dev)
588 index = dev->ifindex;
589 rcu_read_unlock();
4878809f
DM		 590 ret = -ENODEV;
591 if (!dev)
592 goto out;
4878809f
DM		 593 }
594
595 lock_sock(sk);
596 sk->sk_bound_dev_if = index;
597 sk_dst_reset(sk);
598 release_sock(sk);
599
600 ret = 0;
601
602out:
603#endif
604
605 return ret;
606}
607
c91f6df2
BH		 608static int sock_getbindtodevice(struct sock *sk, char __user *optval,
609 int __user *optlen, int len)
610{
611 int ret = -ENOPROTOOPT;
612#ifdef CONFIG_NETDEVICES
613 struct net *net = sock_net(sk);
c91f6df2 614 char devname[IFNAMSIZ];
c91f6df2
BH		 615
616 if (sk->sk_bound_dev_if == 0) {
617 len = 0;
618 goto zero;
619 }
620
621 ret = -EINVAL;
622 if (len < IFNAMSIZ)
623 goto out;
624
5dbe7c17
NS		 625 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
626 if (ret)
c91f6df2 627 goto out;
c91f6df2
BH		 628
629 len = strlen(devname) + 1;
630
631 ret = -EFAULT;
632 if (copy_to_user(optval, devname, len))
633 goto out;
634
635zero:
636 ret = -EFAULT;
637 if (put_user(len, optlen))
638 goto out;
639
640 ret = 0;
641
642out:
643#endif
644
645 return ret;
646}
647
c0ef877b
PE		 648static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
649{
650 if (valbool)
651 sock_set_flag(sk, bit);
652 else
653 sock_reset_flag(sk, bit);
654}
655
1da177e4
LT		 656/*
657 * This is meant for all protocols to use and covers goings on
658 * at the socket level. Everything here is generic.
659 */
660
661int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 662 char __user *optval, unsigned int optlen)
1da177e4 663{
2a91525c 664 struct sock *sk = sock->sk;
1da177e4
LT		 665 int val;
666 int valbool;
667 struct linger ling;
668 int ret = 0;
4ec93edb 669
1da177e4
LT		 670 /*
671 * Options without arguments
672 */
673
4878809f 674 if (optname == SO_BINDTODEVICE)
c91f6df2 675 return sock_setbindtodevice(sk, optval, optlen);
4878809f 676
e71a4783
SH		 677 if (optlen < sizeof(int))
678 return -EINVAL;
4ec93edb 679
1da177e4
LT		 680 if (get_user(val, (int __user *)optval))
681 return -EFAULT;
4ec93edb 682
2a91525c 683 valbool = val ? 1 : 0;
1da177e4
LT		 684
685 lock_sock(sk);
686
2a91525c 687 switch (optname) {
e71a4783 688 case SO_DEBUG:
2a91525c 689 if (val && !capable(CAP_NET_ADMIN))
e71a4783 690 ret = -EACCES;
2a91525c 691 else
c0ef877b 692 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 693 break;
694 case SO_REUSEADDR:
4a17fd52 695 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 696 break;
055dc21a
TH		 697 case SO_REUSEPORT:
698 sk->sk_reuseport = valbool;
699 break;
e71a4783 700 case SO_TYPE:
49c794e9 701 case SO_PROTOCOL:
0d6038ee 702 case SO_DOMAIN:
e71a4783
SH		 703 case SO_ERROR:
704 ret = -ENOPROTOOPT;
705 break;
706 case SO_DONTROUTE:
c0ef877b 707 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 708 break;
709 case SO_BROADCAST:
710 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
711 break;
712 case SO_SNDBUF:
713 /* Don't error on this BSD doesn't and if you think
82981930
ED		 714 * about it this is right. Otherwise apps have to
715 * play 'guess the biggest size' games. RCVBUF/SNDBUF
716 * are treated in BSD as hints
717 */
718 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 719set_sndbuf:
e71a4783 720 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 721 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
722 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 723 sk->sk_write_space(sk);
724 break;
1da177e4 725
e71a4783
SH		 726 case SO_SNDBUFFORCE:
727 if (!capable(CAP_NET_ADMIN)) {
728 ret = -EPERM;
729 break;
730 }
731 goto set_sndbuf;
b0573dea 732
e71a4783
SH		 733 case SO_RCVBUF:
734 /* Don't error on this BSD doesn't and if you think
82981930
ED		 735 * about it this is right. Otherwise apps have to
736 * play 'guess the biggest size' games. RCVBUF/SNDBUF
737 * are treated in BSD as hints
738 */
739 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 740set_rcvbuf:
e71a4783
SH		 741 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
742 /*
743 * We double it on the way in to account for
744 * "struct sk_buff" etc. overhead. Applications
745 * assume that the SO_RCVBUF setting they make will
746 * allow that much actual data to be received on that
747 * socket.
748 *
749 * Applications are unaware that "struct sk_buff" and
750 * other overheads allocate from the receive buffer
751 * during socket buffer allocation.
752 *
753 * And after considering the possible alternatives,
754 * returning the value we actually used in getsockopt
755 * is the most desirable behavior.
756 */
82981930 757 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 758 break;
759
760 case SO_RCVBUFFORCE:
761 if (!capable(CAP_NET_ADMIN)) {
762 ret = -EPERM;
1da177e4 763 break;
e71a4783
SH		 764 }
765 goto set_rcvbuf;
1da177e4 766
e71a4783 767 case SO_KEEPALIVE:
1da177e4 768#ifdef CONFIG_INET
3e10986d
ED		 769 if (sk->sk_protocol == IPPROTO_TCP &&
770 sk->sk_type == SOCK_STREAM)
e71a4783 771 tcp_set_keepalive(sk, valbool);
1da177e4 772#endif
e71a4783
SH		 773 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
774 break;
775
776 case SO_OOBINLINE:
777 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
778 break;
779
780 case SO_NO_CHECK:
28448b80 781 sk->sk_no_check_tx = valbool;
e71a4783
SH		 782 break;
783
784 case SO_PRIORITY:
5e1fccc0
EB		 785 if ((val >= 0 && val <= 6) ||
786 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 787 sk->sk_priority = val;
788 else
789 ret = -EPERM;
790 break;
791
792 case SO_LINGER:
793 if (optlen < sizeof(ling)) {
794 ret = -EINVAL; /* 1003.1g */
1da177e4 795 break;
e71a4783 796 }
2a91525c 797 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 798 ret = -EFAULT;
1da177e4 799 break;
e71a4783
SH		 800 }
801 if (!ling.l_onoff)
802 sock_reset_flag(sk, SOCK_LINGER);
803 else {
1da177e4 804#if (BITS_PER_LONG == 32)
e71a4783
SH		 805 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
806 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 807 else
e71a4783
SH		 808#endif
809 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
810 sock_set_flag(sk, SOCK_LINGER);
811 }
812 break;
813
814 case SO_BSDCOMPAT:
815 sock_warn_obsolete_bsdism("setsockopt");
816 break;
817
818 case SO_PASSCRED:
819 if (valbool)
820 set_bit(SOCK_PASSCRED, &sock->flags);
821 else
822 clear_bit(SOCK_PASSCRED, &sock->flags);
823 break;
824
825 case SO_TIMESTAMP:
92f37fd2 826 case SO_TIMESTAMPNS:
e71a4783 827 if (valbool) {
92f37fd2
ED		 828 if (optname == SO_TIMESTAMP)
829 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
830 else
831 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 832 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 833 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 834 } else {
e71a4783 835 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 836 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
837 }
e71a4783
SH		 838 break;
839
20d49473
PO		 840 case SO_TIMESTAMPING:
841 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 842 ret = -EINVAL;
20d49473
PO		 843 break;
844 }
b245be1f 845
09c2d251 846 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765
WB		 847 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
848 if (sk->sk_protocol == IPPROTO_TCP) {
849 if (sk->sk_state != TCP_ESTABLISHED) {
850 ret = -EINVAL;
851 break;
852 }
853 sk->sk_tskey = tcp_sk(sk)->snd_una;
854 } else {
855 sk->sk_tskey = 0;
856 }
857 }
b9f40e21 858 sk->sk_tsflags = val;
20d49473
PO		 859 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
860 sock_enable_timestamp(sk,
861 SOCK_TIMESTAMPING_RX_SOFTWARE);
862 else
863 sock_disable_timestamp(sk,
08e29af3 864 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 865 break;
866
e71a4783
SH		 867 case SO_RCVLOWAT:
868 if (val < 0)
869 val = INT_MAX;
870 sk->sk_rcvlowat = val ? : 1;
871 break;
872
873 case SO_RCVTIMEO:
874 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
875 break;
876
877 case SO_SNDTIMEO:
878 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
879 break;
1da177e4 880
e71a4783
SH		 881 case SO_ATTACH_FILTER:
882 ret = -EINVAL;
883 if (optlen == sizeof(struct sock_fprog)) {
884 struct sock_fprog fprog;
1da177e4 885
e71a4783
SH		 886 ret = -EFAULT;
887 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 888 break;
e71a4783
SH		 889
890 ret = sk_attach_filter(&fprog, sk);
891 }
892 break;
893
89aa0758
AS		 894 case SO_ATTACH_BPF:
895 ret = -EINVAL;
896 if (optlen == sizeof(u32)) {
897 u32 ufd;
898
899 ret = -EFAULT;
900 if (copy_from_user(&ufd, optval, sizeof(ufd)))
901 break;
902
903 ret = sk_attach_bpf(ufd, sk);
904 }
905 break;
906
e71a4783 907 case SO_DETACH_FILTER:
55b33325 908 ret = sk_detach_filter(sk);
e71a4783 909 break;
1da177e4 910
d59577b6
VB		 911 case SO_LOCK_FILTER:
912 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
913 ret = -EPERM;
914 else
915 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
916 break;
917
e71a4783
SH		 918 case SO_PASSSEC:
919 if (valbool)
920 set_bit(SOCK_PASSSEC, &sock->flags);
921 else
922 clear_bit(SOCK_PASSSEC, &sock->flags);
923 break;
4a19ec58 924 case SO_MARK:
5e1fccc0 925 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 926 ret = -EPERM;
2a91525c 927 else
4a19ec58 928 sk->sk_mark = val;
4a19ec58 929 break;
877ce7c1 930
1da177e4
LT		 931 /* We implement the SO_SNDLOWAT etc to
932 not be settable (1003.1g 5.3) */
3b885787 933 case SO_RXQ_OVFL:
8083f0fc 934 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 935 break;
6e3e939f
JB		 936
937 case SO_WIFI_STATUS:
938 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
939 break;
940
ef64a54f
PE		 941 case SO_PEEK_OFF:
942 if (sock->ops->set_peek_off)
12663bfc 943 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 944 else
945 ret = -EOPNOTSUPP;
946 break;
3bdc0eba
BG		 947
948 case SO_NOFCS:
949 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
950 break;
951
7d4c04fc
KJ		 952 case SO_SELECT_ERR_QUEUE:
953 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
954 break;
955
e0d1095a 956#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 957 case SO_BUSY_POLL:
dafcc438
ET		 958 /* allow unprivileged users to decrease the value */
959 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
960 ret = -EPERM;
961 else {
962 if (val < 0)
963 ret = -EINVAL;
964 else
965 sk->sk_ll_usec = val;
966 }
967 break;
968#endif
62748f32
ED		 969
970 case SO_MAX_PACING_RATE:
971 sk->sk_max_pacing_rate = val;
972 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
973 sk->sk_max_pacing_rate);
974 break;
975
e71a4783
SH		 976 default:
977 ret = -ENOPROTOOPT;
978 break;
4ec93edb 979 }
1da177e4
LT		 980 release_sock(sk);
981 return ret;
982}
2a91525c 983EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 984
985
8f09898b 986static void cred_to_ucred(struct pid *pid, const struct cred *cred,
987 struct ucred *ucred)
3f551f94
EB		 988{
989 ucred->pid = pid_vnr(pid);
990 ucred->uid = ucred->gid = -1;
991 if (cred) {
992 struct user_namespace *current_ns = current_user_ns();
993
b2e4f544
EB		 994 ucred->uid = from_kuid_munged(current_ns, cred->euid);
995 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 996 }
997}
998
1da177e4
LT		 999int sock_getsockopt(struct socket *sock, int level, int optname,
1000 char __user *optval, int __user *optlen)
1001{
1002 struct sock *sk = sock->sk;
4ec93edb 1003
e71a4783 1004 union {
4ec93edb
YH		 1005 int val;
1006 struct linger ling;
1da177e4
LT		 1007 struct timeval tm;
1008 } v;
4ec93edb 1009
4d0392be 1010 int lv = sizeof(int);
1da177e4 1011 int len;
4ec93edb 1012
e71a4783 1013 if (get_user(len, optlen))
4ec93edb 1014 return -EFAULT;
e71a4783 1015 if (len < 0)
1da177e4 1016 return -EINVAL;
4ec93edb 1017
50fee1de 1018 memset(&v, 0, sizeof(v));
df0bca04 1019
2a91525c 1020 switch (optname) {
e71a4783
SH		 1021 case SO_DEBUG:
1022 v.val = sock_flag(sk, SOCK_DBG);
1023 break;
1024
1025 case SO_DONTROUTE:
1026 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1027 break;
1028
1029 case SO_BROADCAST:
1b23a5df 1030 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1031 break;
1032
1033 case SO_SNDBUF:
1034 v.val = sk->sk_sndbuf;
1035 break;
1036
1037 case SO_RCVBUF:
1038 v.val = sk->sk_rcvbuf;
1039 break;
1040
1041 case SO_REUSEADDR:
1042 v.val = sk->sk_reuse;
1043 break;
1044
055dc21a
TH		 1045 case SO_REUSEPORT:
1046 v.val = sk->sk_reuseport;
1047 break;
1048
e71a4783 1049 case SO_KEEPALIVE:
1b23a5df 1050 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1051 break;
1052
1053 case SO_TYPE:
1054 v.val = sk->sk_type;
1055 break;
1056
49c794e9
JE		 1057 case SO_PROTOCOL:
1058 v.val = sk->sk_protocol;
1059 break;
1060
0d6038ee
JE		 1061 case SO_DOMAIN:
1062 v.val = sk->sk_family;
1063 break;
1064
e71a4783
SH		 1065 case SO_ERROR:
1066 v.val = -sock_error(sk);
2a91525c 1067 if (v.val == 0)
e71a4783
SH		 1068 v.val = xchg(&sk->sk_err_soft, 0);
1069 break;
1070
1071 case SO_OOBINLINE:
1b23a5df 1072 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1073 break;
1074
1075 case SO_NO_CHECK:
28448b80 1076 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1077 break;
1078
1079 case SO_PRIORITY:
1080 v.val = sk->sk_priority;
1081 break;
1082
1083 case SO_LINGER:
1084 lv = sizeof(v.ling);
1b23a5df 1085 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1086 v.ling.l_linger = sk->sk_lingertime / HZ;
1087 break;
1088
1089 case SO_BSDCOMPAT:
1090 sock_warn_obsolete_bsdism("getsockopt");
1091 break;
1092
1093 case SO_TIMESTAMP:
92f37fd2
ED		 1094 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1095 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1096 break;
1097
1098 case SO_TIMESTAMPNS:
1099 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1100 break;
1101
20d49473 1102 case SO_TIMESTAMPING:
b9f40e21 1103 v.val = sk->sk_tsflags;
20d49473
PO		 1104 break;
1105
e71a4783 1106 case SO_RCVTIMEO:
2a91525c 1107 lv = sizeof(struct timeval);
e71a4783
SH		 1108 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1109 v.tm.tv_sec = 0;
1110 v.tm.tv_usec = 0;
1111 } else {
1112 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1113 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1114 }
1115 break;
1116
1117 case SO_SNDTIMEO:
2a91525c 1118 lv = sizeof(struct timeval);
e71a4783
SH		 1119 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1120 v.tm.tv_sec = 0;
1121 v.tm.tv_usec = 0;
1122 } else {
1123 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1124 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1125 }
1126 break;
1da177e4 1127
e71a4783
SH		 1128 case SO_RCVLOWAT:
1129 v.val = sk->sk_rcvlowat;
1130 break;
1da177e4 1131
e71a4783 1132 case SO_SNDLOWAT:
2a91525c 1133 v.val = 1;
e71a4783 1134 break;
1da177e4 1135
e71a4783 1136 case SO_PASSCRED:
82981930 1137 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1138 break;
1da177e4 1139
e71a4783 1140 case SO_PEERCRED:
109f6e39
EB		 1141 {
1142 struct ucred peercred;
1143 if (len > sizeof(peercred))
1144 len = sizeof(peercred);
1145 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1146 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1147 return -EFAULT;
1148 goto lenout;
109f6e39 1149 }
1da177e4 1150
e71a4783
SH		 1151 case SO_PEERNAME:
1152 {
1153 char address[128];
1154
1155 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1156 return -ENOTCONN;
1157 if (lv < len)
1158 return -EINVAL;
1159 if (copy_to_user(optval, address, len))
1160 return -EFAULT;
1161 goto lenout;
1162 }
1da177e4 1163
e71a4783
SH		 1164 /* Dubious BSD thing... Probably nobody even uses it, but
1165 * the UNIX standard wants it for whatever reason... -DaveM
1166 */
1167 case SO_ACCEPTCONN:
1168 v.val = sk->sk_state == TCP_LISTEN;
1169 break;
1da177e4 1170
e71a4783 1171 case SO_PASSSEC:
82981930 1172 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1173 break;
877ce7c1 1174
e71a4783
SH		 1175 case SO_PEERSEC:
1176 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1177
4a19ec58
LAT		 1178 case SO_MARK:
1179 v.val = sk->sk_mark;
1180 break;
1181
3b885787 1182 case SO_RXQ_OVFL:
1b23a5df 1183 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1184 break;
1185
6e3e939f 1186 case SO_WIFI_STATUS:
1b23a5df 1187 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1188 break;
1189
ef64a54f
PE		 1190 case SO_PEEK_OFF:
1191 if (!sock->ops->set_peek_off)
1192 return -EOPNOTSUPP;
1193
1194 v.val = sk->sk_peek_off;
1195 break;
bc2f7996 1196 case SO_NOFCS:
1b23a5df 1197 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1198 break;
c91f6df2 1199
f7b86bfe 1200 case SO_BINDTODEVICE:
c91f6df2
BH		 1201 return sock_getbindtodevice(sk, optval, optlen, len);
1202
a8fc9277
PE		 1203 case SO_GET_FILTER:
1204 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1205 if (len < 0)
1206 return len;
1207
1208 goto lenout;
c91f6df2 1209
d59577b6
VB		 1210 case SO_LOCK_FILTER:
1211 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1212 break;
1213
ea02f941
MS		 1214 case SO_BPF_EXTENSIONS:
1215 v.val = bpf_tell_extensions();
1216 break;
1217
7d4c04fc
KJ		 1218 case SO_SELECT_ERR_QUEUE:
1219 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1220 break;
1221
e0d1095a 1222#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1223 case SO_BUSY_POLL:
dafcc438
ET		 1224 v.val = sk->sk_ll_usec;
1225 break;
1226#endif
1227
62748f32
ED		 1228 case SO_MAX_PACING_RATE:
1229 v.val = sk->sk_max_pacing_rate;
1230 break;
1231
2c8c56e1
ED		 1232 case SO_INCOMING_CPU:
1233 v.val = sk->sk_incoming_cpu;
1234 break;
1235
e71a4783
SH		 1236 default:
1237 return -ENOPROTOOPT;
1da177e4 1238 }
e71a4783 1239
1da177e4
LT		 1240 if (len > lv)
1241 len = lv;
1242 if (copy_to_user(optval, &v, len))
1243 return -EFAULT;
1244lenout:
4ec93edb
YH		 1245 if (put_user(len, optlen))
1246 return -EFAULT;
1247 return 0;
1da177e4
LT		 1248}
1249
a5b5bb9a
IM		 1250/*
1251 * Initialize an sk_lock.
1252 *
1253 * (We also register the sk_lock with the lock validator.)
1254 */
b6f99a21 1255static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1256{
ed07536e
PZ		 1257 sock_lock_init_class_and_name(sk,
1258 af_family_slock_key_strings[sk->sk_family],
1259 af_family_slock_keys + sk->sk_family,
1260 af_family_key_strings[sk->sk_family],
1261 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1262}
1263
4dc6dc71
ED		 1264/*
1265 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1266 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1267 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1268 */
f1a6c4da
PE		 1269static void sock_copy(struct sock *nsk, const struct sock *osk)
1270{
1271#ifdef CONFIG_SECURITY_NETWORK
1272 void *sptr = nsk->sk_security;
1273#endif
68835aba
ED		 1274 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1275
1276 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1277 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1278
f1a6c4da
PE		 1279#ifdef CONFIG_SECURITY_NETWORK
1280 nsk->sk_security = sptr;
1281 security_sk_clone(osk, nsk);
1282#endif
1283}
1284
fcbdf09d
OP		 1285void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1286{
1287 unsigned long nulls1, nulls2;
1288
1289 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1290 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1291 if (nulls1 > nulls2)
1292 swap(nulls1, nulls2);
1293
1294 if (nulls1 != 0)
1295 memset((char *)sk, 0, nulls1);
1296 memset((char *)sk + nulls1 + sizeof(void *), 0,
1297 nulls2 - nulls1 - sizeof(void *));
1298 memset((char *)sk + nulls2 + sizeof(void *), 0,
1299 size - nulls2 - sizeof(void *));
1300}
1301EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1302
2e4afe7b
PE		 1303static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1304 int family)
c308c1b2
PE		 1305{
1306 struct sock *sk;
1307 struct kmem_cache *slab;
1308
1309 slab = prot->slab;
e912b114
ED		 1310 if (slab != NULL) {
1311 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1312 if (!sk)
1313 return sk;
1314 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1315 if (prot->clear_sk)
1316 prot->clear_sk(sk, prot->obj_size);
1317 else
1318 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1319 }
fcbdf09d 1320 } else
c308c1b2
PE		 1321 sk = kmalloc(prot->obj_size, priority);
1322
2e4afe7b 1323 if (sk != NULL) {
a98b65a3
VN		 1324 kmemcheck_annotate_bitfield(sk, flags);
1325
2e4afe7b
PE		 1326 if (security_sk_alloc(sk, family, priority))
1327 goto out_free;
1328
1329 if (!try_module_get(prot->owner))
1330 goto out_free_sec;
e022f0b4 1331 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1332 }
1333
c308c1b2 1334 return sk;
2e4afe7b
PE		 1335
1336out_free_sec:
1337 security_sk_free(sk);
1338out_free:
1339 if (slab != NULL)
1340 kmem_cache_free(slab, sk);
1341 else
1342 kfree(sk);
1343 return NULL;
c308c1b2
PE		 1344}
1345
1346static void sk_prot_free(struct proto *prot, struct sock *sk)
1347{
1348 struct kmem_cache *slab;
2e4afe7b 1349 struct module *owner;
c308c1b2 1350
2e4afe7b 1351 owner = prot->owner;
c308c1b2 1352 slab = prot->slab;
2e4afe7b
PE		 1353
1354 security_sk_free(sk);
c308c1b2
PE		 1355 if (slab != NULL)
1356 kmem_cache_free(slab, sk);
1357 else
1358 kfree(sk);
2e4afe7b 1359 module_put(owner);
c308c1b2
PE		 1360}
1361
86f8515f 1362#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
6ffd4641 1363void sock_update_netprioidx(struct sock *sk)
5bc1421e 1364{
5bc1421e
NH		 1365 if (in_interrupt())
1366 return;
2b73bc65 1367
6ffd4641 1368 sk->sk_cgrp_prioidx = task_netprioidx(current);
5bc1421e
NH		 1369}
1370EXPORT_SYMBOL_GPL(sock_update_netprioidx);
f8451725
HX		 1371#endif
1372
1da177e4
LT		 1373/**
1374 * sk_alloc - All socket objects are allocated here
c4ea43c5 1375 * @net: the applicable net namespace
4dc3b16b
PP		 1376 * @family: protocol family
1377 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1378 * @prot: struct proto associated with this new sock instance
1da177e4 1379 */
1b8d7ae4 1380struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1381 struct proto *prot)
1da177e4 1382{
c308c1b2 1383 struct sock *sk;
1da177e4 1384
154adbc8 1385 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1386 if (sk) {
154adbc8
PE		 1387 sk->sk_family = family;
1388 /*
1389 * See comment in struct sock definition to understand
1390 * why we need sk_prot_creator -acme
1391 */
1392 sk->sk_prot = sk->sk_prot_creator = prot;
1393 sock_lock_init(sk);
3b1e0a65 1394 sock_net_set(sk, get_net(net));
d66ee058 1395 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1396
211d2f97 1397 sock_update_classid(sk);
6ffd4641 1398 sock_update_netprioidx(sk);
1da177e4 1399 }
a79af59e 1400
2e4afe7b 1401 return sk;
1da177e4 1402}
2a91525c 1403EXPORT_SYMBOL(sk_alloc);
1da177e4 1404
2b85a34e 1405static void __sk_free(struct sock *sk)
1da177e4
LT		 1406{
1407 struct sk_filter *filter;
1da177e4
LT		 1408
1409 if (sk->sk_destruct)
1410 sk->sk_destruct(sk);
1411
a898def2
PM		 1412 filter = rcu_dereference_check(sk->sk_filter,
1413 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1414 if (filter) {
309dd5fc 1415 sk_filter_uncharge(sk, filter);
a9b3cd7f 1416 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1417 }
1418
08e29af3 1419 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1420
1421 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1422 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1423 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1424
109f6e39
EB		 1425 if (sk->sk_peer_cred)
1426 put_cred(sk->sk_peer_cred);
1427 put_pid(sk->sk_peer_pid);
3b1e0a65 1428 put_net(sock_net(sk));
c308c1b2 1429 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1430}
2b85a34e
ED		 1431
1432void sk_free(struct sock *sk)
1433{
1434 /*
25985edc 1435 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1436 * some packets are still in some tx queue.
1437 * If not null, sock_wfree() will call __sk_free(sk) later
1438 */
1439 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1440 __sk_free(sk);
1441}
2a91525c 1442EXPORT_SYMBOL(sk_free);
1da177e4 1443
edf02087 1444/*
25985edc
LDM		 1445 * Last sock_put should drop reference to sk->sk_net. It has already
1446 * been dropped in sk_change_net. Taking reference to stopping namespace
edf02087 1447 * is not an option.
25985edc 1448 * Take reference to a socket to remove it from hash _alive_ and after that
edf02087
DL		 1449 * destroy it in the context of init_net.
1450 */
1451void sk_release_kernel(struct sock *sk)
1452{
1453 if (sk == NULL || sk->sk_socket == NULL)
1454 return;
1455
1456 sock_hold(sk);
1457 sock_release(sk->sk_socket);
65a18ec5 1458 release_net(sock_net(sk));
3b1e0a65 1459 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1460 sock_put(sk);
1461}
45af1754 1462EXPORT_SYMBOL(sk_release_kernel);
edf02087 1463
475f1b52
SR		 1464static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1465{
1466 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1467 sock_update_memcg(newsk);
1468}
1469
e56c57d0
ED		 1470/**
1471 * sk_clone_lock - clone a socket, and lock its clone
1472 * @sk: the socket to clone
1473 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1474 *
1475 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1476 */
1477struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1478{
8fd1d178 1479 struct sock *newsk;
278571ba 1480 bool is_charged = true;
87d11ceb 1481
8fd1d178 1482 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1483 if (newsk != NULL) {
1484 struct sk_filter *filter;
1485
892c141e 1486 sock_copy(newsk, sk);
87d11ceb
ACM		 1487
1488 /* SANITY */
3b1e0a65 1489 get_net(sock_net(newsk));
87d11ceb
ACM		 1490 sk_node_init(&newsk->sk_node);
1491 sock_lock_init(newsk);
1492 bh_lock_sock(newsk);
fa438ccf 1493 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1494 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1495
1496 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1497 /*
1498 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1499 */
1500 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1501 atomic_set(&newsk->sk_omem_alloc, 0);
1502 skb_queue_head_init(&newsk->sk_receive_queue);
1503 skb_queue_head_init(&newsk->sk_write_queue);
1504
b6c6712a 1505 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1506 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1507 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1508 af_callback_keys + newsk->sk_family,
1509 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1510
1511 newsk->sk_dst_cache = NULL;
1512 newsk->sk_wmem_queued = 0;
1513 newsk->sk_forward_alloc = 0;
1514 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1515 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1516
1517 sock_reset_flag(newsk, SOCK_DONE);
1518 skb_queue_head_init(&newsk->sk_error_queue);
1519
0d7da9dd 1520 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb 1521 if (filter != NULL)
278571ba
AS		 1522 /* though it's an empty new sock, the charging may fail
1523 * if sysctl_optmem_max was changed between creation of
1524 * original socket and cloning
1525 */
1526 is_charged = sk_filter_charge(newsk, filter);
87d11ceb 1527
278571ba 1528 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk))) {
87d11ceb
ACM		 1529 /* It is still raw copy of parent, so invalidate
1530 * destructor and make plain sk_free() */
1531 newsk->sk_destruct = NULL;
b0691c8e 1532 bh_unlock_sock(newsk);
87d11ceb
ACM		 1533 sk_free(newsk);
1534 newsk = NULL;
1535 goto out;
1536 }
1537
1538 newsk->sk_err = 0;
1539 newsk->sk_priority = 0;
2c8c56e1 1540 newsk->sk_incoming_cpu = raw_smp_processor_id();
4dc6dc71
ED		 1541 /*
1542 * Before updating sk_refcnt, we must commit prior changes to memory
1543 * (Documentation/RCU/rculist_nulls.txt for details)
1544 */
1545 smp_wmb();
87d11ceb
ACM		 1546 atomic_set(&newsk->sk_refcnt, 2);
1547
1548 /*
1549 * Increment the counter in the same struct proto as the master
1550 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1551 * is the same as sk->sk_prot->socks, as this field was copied
1552 * with memcpy).
1553 *
1554 * This _changes_ the previous behaviour, where
1555 * tcp_create_openreq_child always was incrementing the
1556 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1557 * to be taken into account in all callers. -acme
1558 */
1559 sk_refcnt_debug_inc(newsk);
972692e0 1560 sk_set_socket(newsk, NULL);
43815482 1561 newsk->sk_wq = NULL;
87d11ceb 1562
f3f511e1
GC		 1563 sk_update_clone(sk, newsk);
1564
87d11ceb 1565 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1566 sk_sockets_allocated_inc(newsk);
704da560 1567
08e29af3 1568 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1569 net_enable_timestamp();
87d11ceb
ACM		 1570 }
1571out:
1572 return newsk;
1573}
e56c57d0 1574EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1575
9958089a
AK		 1576void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1577{
1578 __sk_dst_set(sk, dst);
1579 sk->sk_route_caps = dst->dev->features;
1580 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1581 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1582 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1583 if (sk_can_gso(sk)) {
82cc1a7a 1584 if (dst->header_len) {
9958089a 1585 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1586 } else {
9958089a 1587 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1588 sk->sk_gso_max_size = dst->dev->gso_max_size;
1485348d 1589 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
82cc1a7a 1590 }
9958089a
AK		 1591 }
1592}
1593EXPORT_SYMBOL_GPL(sk_setup_caps);
1594
1da177e4
LT		 1595/*
1596 * Simple resource managers for sockets.
1597 */
1598
1599
4ec93edb
YH		 1600/*
1601 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1602 */
1603void sock_wfree(struct sk_buff *skb)
1604{
1605 struct sock *sk = skb->sk;
d99927f4 1606 unsigned int len = skb->truesize;
1da177e4 1607
d99927f4
ED		 1608 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1609 /*
1610 * Keep a reference on sk_wmem_alloc, this will be released
1611 * after sk_write_space() call
1612 */
1613 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1614 sk->sk_write_space(sk);
d99927f4
ED		 1615 len = 1;
1616 }
2b85a34e 1617 /*
d99927f4
ED		 1618 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1619 * could not do because of in-flight packets
2b85a34e 1620 */
d99927f4 1621 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1622 __sk_free(sk);
1da177e4 1623}
2a91525c 1624EXPORT_SYMBOL(sock_wfree);
1da177e4 1625
f2f872f9
ED		 1626void skb_orphan_partial(struct sk_buff *skb)
1627{
1628 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1629 * so we do not completely orphan skb, but transfert all
1630 * accounted bytes but one, to avoid unexpected reorders.
1631 */
1632 if (skb->destructor == sock_wfree
1633#ifdef CONFIG_INET
1634 || skb->destructor == tcp_wfree
1635#endif
1636 ) {
1637 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1638 skb->truesize = 1;
1639 } else {
1640 skb_orphan(skb);
1641 }
1642}
1643EXPORT_SYMBOL(skb_orphan_partial);
1644
4ec93edb
YH		 1645/*
1646 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1647 */
1648void sock_rfree(struct sk_buff *skb)
1649{
1650 struct sock *sk = skb->sk;
d361fd59 1651 unsigned int len = skb->truesize;
1da177e4 1652
d361fd59
ED		 1653 atomic_sub(len, &sk->sk_rmem_alloc);
1654 sk_mem_uncharge(sk, len);
1da177e4 1655}
2a91525c 1656EXPORT_SYMBOL(sock_rfree);
1da177e4 1657
62bccb8c
AD		 1658void sock_efree(struct sk_buff *skb)
1659{
1660 sock_put(skb->sk);
1661}
1662EXPORT_SYMBOL(sock_efree);
1663
82eabd9e 1664#ifdef CONFIG_INET
41063e9d
DM		 1665void sock_edemux(struct sk_buff *skb)
1666{
e812347c
ED		 1667 struct sock *sk = skb->sk;
1668
1669 if (sk->sk_state == TCP_TIME_WAIT)
1670 inet_twsk_put(inet_twsk(sk));
1671 else
1672 sock_put(sk);
41063e9d
DM		 1673}
1674EXPORT_SYMBOL(sock_edemux);
82eabd9e 1675#endif
1da177e4 1676
976d0201 1677kuid_t sock_i_uid(struct sock *sk)
1da177e4 1678{
976d0201 1679 kuid_t uid;
1da177e4 1680
f064af1e 1681 read_lock_bh(&sk->sk_callback_lock);
976d0201 1682 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1683 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1684 return uid;
1685}
2a91525c 1686EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1687
1688unsigned long sock_i_ino(struct sock *sk)
1689{
1690 unsigned long ino;
1691
f064af1e 1692 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1693 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1694 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1695 return ino;
1696}
2a91525c 1697EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1698
1699/*
1700 * Allocate a skb from the socket's send buffer.
1701 */
86a76caf 1702struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1703 gfp_t priority)
1da177e4
LT		 1704{
1705 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1706 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1707 if (skb) {
1708 skb_set_owner_w(skb, sk);
1709 return skb;
1710 }
1711 }
1712 return NULL;
1713}
2a91525c 1714EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1715
4ec93edb 1716/*
1da177e4 1717 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1718 */
dd0fc66f 1719void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1720{
95c96174 1721 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1722 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1723 void *mem;
1724 /* First do the add, to avoid the race if kmalloc
4ec93edb 1725 * might sleep.
1da177e4
LT		 1726 */
1727 atomic_add(size, &sk->sk_omem_alloc);
1728 mem = kmalloc(size, priority);
1729 if (mem)
1730 return mem;
1731 atomic_sub(size, &sk->sk_omem_alloc);
1732 }
1733 return NULL;
1734}
2a91525c 1735EXPORT_SYMBOL(sock_kmalloc);
1da177e4 1736
79e88659
DB		 1737/* Free an option memory block. Note, we actually want the inline
1738 * here as this allows gcc to detect the nullify and fold away the
1739 * condition entirely.
1da177e4 1740 */
79e88659
DB		 1741static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1742 const bool nullify)
1da177e4 1743{
e53da5fb
DM		 1744 if (WARN_ON_ONCE(!mem))
1745 return;
79e88659
DB		 1746 if (nullify)
1747 kzfree(mem);
1748 else
1749 kfree(mem);
1da177e4
LT		 1750 atomic_sub(size, &sk->sk_omem_alloc);
1751}
79e88659
DB		 1752
1753void sock_kfree_s(struct sock *sk, void *mem, int size)
1754{
1755 __sock_kfree_s(sk, mem, size, false);
1756}
2a91525c 1757EXPORT_SYMBOL(sock_kfree_s);
1da177e4 1758
79e88659
DB		 1759void sock_kzfree_s(struct sock *sk, void *mem, int size)
1760{
1761 __sock_kfree_s(sk, mem, size, true);
1762}
1763EXPORT_SYMBOL(sock_kzfree_s);
1764
1da177e4
LT		 1765/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1766 I think, these locks should be removed for datagram sockets.
1767 */
2a91525c 1768static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1769{
1770 DEFINE_WAIT(wait);
1771
1772 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1773 for (;;) {
1774 if (!timeo)
1775 break;
1776 if (signal_pending(current))
1777 break;
1778 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1779 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1780 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1781 break;
1782 if (sk->sk_shutdown & SEND_SHUTDOWN)
1783 break;
1784 if (sk->sk_err)
1785 break;
1786 timeo = schedule_timeout(timeo);
1787 }
aa395145 1788 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1789 return timeo;
1790}
1791
1792
1793/*
1794 * Generic send/receive buffer handlers
1795 */
1796
4cc7f68d
HX		 1797struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1798 unsigned long data_len, int noblock,
28d64271 1799 int *errcode, int max_page_order)
1da177e4 1800{
2e4e4410 1801 struct sk_buff *skb;
1da177e4
LT		 1802 long timeo;
1803 int err;
1804
1da177e4 1805 timeo = sock_sndtimeo(sk, noblock);
2e4e4410 1806 for (;;) {
1da177e4
LT		 1807 err = sock_error(sk);
1808 if (err != 0)
1809 goto failure;
1810
1811 err = -EPIPE;
1812 if (sk->sk_shutdown & SEND_SHUTDOWN)
1813 goto failure;
1814
2e4e4410
ED		 1815 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
1816 break;
28d64271 1817
2e4e4410
ED		 1818 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1819 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1820 err = -EAGAIN;
1821 if (!timeo)
1da177e4 1822 goto failure;
2e4e4410
ED		 1823 if (signal_pending(current))
1824 goto interrupted;
1825 timeo = sock_wait_for_wmem(sk, timeo);
1da177e4 1826 }
2e4e4410
ED		 1827 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
1828 errcode, sk->sk_allocation);
1829 if (skb)
1830 skb_set_owner_w(skb, sk);
1da177e4
LT		 1831 return skb;
1832
1833interrupted:
1834 err = sock_intr_errno(timeo);
1835failure:
1836 *errcode = err;
1837 return NULL;
1838}
4cc7f68d 1839EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1840
4ec93edb 1841struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1842 int noblock, int *errcode)
1843{
28d64271 1844 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1845}
2a91525c 1846EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1847
5640f768
ED		 1848/* On 32bit arches, an skb frag is limited to 2^15 */
1849#define SKB_FRAG_PAGE_ORDER get_order(32768)
1850
400dfd3a
ED		 1851/**
1852 * skb_page_frag_refill - check that a page_frag contains enough room
1853 * @sz: minimum size of the fragment we want to get
1854 * @pfrag: pointer to page_frag
82d5e2b8 1855 * @gfp: priority for memory allocation
400dfd3a
ED		 1856 *
1857 * Note: While this allocator tries to use high order pages, there is
1858 * no guarantee that allocations succeed. Therefore, @sz MUST be
1859 * less or equal than PAGE_SIZE.
1860 */
d9b2938a 1861bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 1862{
5640f768
ED		 1863 if (pfrag->page) {
1864 if (atomic_read(&pfrag->page->_count) == 1) {
1865 pfrag->offset = 0;
1866 return true;
1867 }
400dfd3a 1868 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1869 return true;
1870 put_page(pfrag->page);
1871 }
1872
d9b2938a
ED		 1873 pfrag->offset = 0;
1874 if (SKB_FRAG_PAGE_ORDER) {
1875 pfrag->page = alloc_pages(gfp | __GFP_COMP |
1876 __GFP_NOWARN | __GFP_NORETRY,
1877 SKB_FRAG_PAGE_ORDER);
5640f768 1878 if (likely(pfrag->page)) {
d9b2938a 1879 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 1880 return true;
1881 }
d9b2938a
ED		 1882 }
1883 pfrag->page = alloc_page(gfp);
1884 if (likely(pfrag->page)) {
1885 pfrag->size = PAGE_SIZE;
1886 return true;
1887 }
400dfd3a
ED		 1888 return false;
1889}
1890EXPORT_SYMBOL(skb_page_frag_refill);
1891
1892bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1893{
1894 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1895 return true;
1896
5640f768
ED		 1897 sk_enter_memory_pressure(sk);
1898 sk_stream_moderate_sndbuf(sk);
1899 return false;
1900}
1901EXPORT_SYMBOL(sk_page_frag_refill);
1902
1da177e4 1903static void __lock_sock(struct sock *sk)
f39234d6
NK		 1904 __releases(&sk->sk_lock.slock)
1905 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1906{
1907 DEFINE_WAIT(wait);
1908
e71a4783 1909 for (;;) {
1da177e4
LT		 1910 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1911 TASK_UNINTERRUPTIBLE);
1912 spin_unlock_bh(&sk->sk_lock.slock);
1913 schedule();
1914 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1915 if (!sock_owned_by_user(sk))
1da177e4
LT		 1916 break;
1917 }
1918 finish_wait(&sk->sk_lock.wq, &wait);
1919}
1920
1921static void __release_sock(struct sock *sk)
f39234d6
NK		 1922 __releases(&sk->sk_lock.slock)
1923 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1924{
1925 struct sk_buff *skb = sk->sk_backlog.head;
1926
1927 do {
1928 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1929 bh_unlock_sock(sk);
1930
1931 do {
1932 struct sk_buff *next = skb->next;
1933
e4cbb02a 1934 prefetch(next);
7fee226a 1935 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1936 skb->next = NULL;
c57943a1 1937 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1938
1939 /*
1940 * We are in process context here with softirqs
1941 * disabled, use cond_resched_softirq() to preempt.
1942 * This is safe to do because we've taken the backlog
1943 * queue private:
1944 */
1945 cond_resched_softirq();
1946
1947 skb = next;
1948 } while (skb != NULL);
1949
1950 bh_lock_sock(sk);
e71a4783 1951 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1952
1953 /*
1954 * Doing the zeroing here guarantee we can not loop forever
1955 * while a wild producer attempts to flood us.
1956 */
1957 sk->sk_backlog.len = 0;
1da177e4
LT		 1958}
1959
1960/**
1961 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1962 * @sk: sock to wait on
1963 * @timeo: for how long
1da177e4
LT		 1964 *
1965 * Now socket state including sk->sk_err is changed only under lock,
1966 * hence we may omit checks after joining wait queue.
1967 * We check receive queue before schedule() only as optimization;
1968 * it is very likely that release_sock() added new data.
1969 */
1970int sk_wait_data(struct sock *sk, long *timeo)
1971{
1972 int rc;
1973 DEFINE_WAIT(wait);
1974
aa395145 1975 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1976 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1977 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1978 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1979 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1980 return rc;
1981}
1da177e4
LT		 1982EXPORT_SYMBOL(sk_wait_data);
1983
3ab224be
HA		 1984/**
1985 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1986 * @sk: socket
1987 * @size: memory size to allocate
1988 * @kind: allocation type
1989 *
1990 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1991 * rmem allocation. This function assumes that protocols which have
1992 * memory_pressure use sk_wmem_queued as write buffer accounting.
1993 */
1994int __sk_mem_schedule(struct sock *sk, int size, int kind)
1995{
1996 struct proto *prot = sk->sk_prot;
1997 int amt = sk_mem_pages(size);
8d987e5c 1998 long allocated;
e1aab161 1999 int parent_status = UNDER_LIMIT;
3ab224be
HA		 2000
2001 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 2002
e1aab161 2003 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 2004
2005 /* Under limit. */
e1aab161
GC		 2006 if (parent_status == UNDER_LIMIT &&
2007 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2008 sk_leave_memory_pressure(sk);
3ab224be
HA		 2009 return 1;
2010 }
2011
e1aab161
GC		 2012 /* Under pressure. (we or our parents) */
2013 if ((parent_status > SOFT_LIMIT) ||
2014 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2015 sk_enter_memory_pressure(sk);
3ab224be 2016
e1aab161
GC		 2017 /* Over hard limit (we or our parents) */
2018 if ((parent_status == OVER_LIMIT) ||
2019 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 2020 goto suppress_allocation;
2021
2022 /* guarantee minimum buffer size under pressure */
2023 if (kind == SK_MEM_RECV) {
2024 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2025 return 1;
180d8cd9 2026
3ab224be
HA		 2027 } else { /* SK_MEM_SEND */
2028 if (sk->sk_type == SOCK_STREAM) {
2029 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2030 return 1;
2031 } else if (atomic_read(&sk->sk_wmem_alloc) <
2032 prot->sysctl_wmem[0])
2033 return 1;
2034 }
2035
180d8cd9 2036 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2037 int alloc;
2038
180d8cd9 2039 if (!sk_under_memory_pressure(sk))
1748376b 2040 return 1;
180d8cd9
GC		 2041 alloc = sk_sockets_allocated_read_positive(sk);
2042 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2043 sk_mem_pages(sk->sk_wmem_queued +
2044 atomic_read(&sk->sk_rmem_alloc) +
2045 sk->sk_forward_alloc))
2046 return 1;
2047 }
2048
2049suppress_allocation:
2050
2051 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2052 sk_stream_moderate_sndbuf(sk);
2053
2054 /* Fail only if socket is _under_ its sndbuf.
2055 * In this case we cannot block, so that we have to fail.
2056 */
2057 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2058 return 1;
2059 }
2060
3847ce32
SM		 2061 trace_sock_exceed_buf_limit(sk, prot, allocated);
2062
3ab224be
HA		 2063 /* Alas. Undo changes. */
2064 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2065
0e90b31f 2066 sk_memory_allocated_sub(sk, amt);
180d8cd9 2067
3ab224be
HA		 2068 return 0;
2069}
3ab224be
HA		 2070EXPORT_SYMBOL(__sk_mem_schedule);
2071
2072/**
2073 * __sk_reclaim - reclaim memory_allocated
2074 * @sk: socket
2075 */
2076void __sk_mem_reclaim(struct sock *sk)
2077{
180d8cd9 2078 sk_memory_allocated_sub(sk,
0e90b31f 2079 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
3ab224be
HA		 2080 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
2081
180d8cd9
GC		 2082 if (sk_under_memory_pressure(sk) &&
2083 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2084 sk_leave_memory_pressure(sk);
3ab224be 2085}
3ab224be
HA		 2086EXPORT_SYMBOL(__sk_mem_reclaim);
2087
2088
1da177e4
LT		 2089/*
2090 * Set of default routines for initialising struct proto_ops when
2091 * the protocol does not support a particular function. In certain
2092 * cases where it makes no sense for a protocol to have a "do nothing"
2093 * function, some default processing is provided.
2094 */
2095
2096int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2097{
2098 return -EOPNOTSUPP;
2099}
2a91525c 2100EXPORT_SYMBOL(sock_no_bind);
1da177e4 2101
4ec93edb 2102int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2103 int len, int flags)
2104{
2105 return -EOPNOTSUPP;
2106}
2a91525c 2107EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2108
2109int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2110{
2111 return -EOPNOTSUPP;
2112}
2a91525c 2113EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2114
2115int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2116{
2117 return -EOPNOTSUPP;
2118}
2a91525c 2119EXPORT_SYMBOL(sock_no_accept);
1da177e4 2120
4ec93edb 2121int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2122 int *len, int peer)
2123{
2124 return -EOPNOTSUPP;
2125}
2a91525c 2126EXPORT_SYMBOL(sock_no_getname);
1da177e4 2127
2a91525c 2128unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2129{
2130 return 0;
2131}
2a91525c 2132EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2133
2134int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2135{
2136 return -EOPNOTSUPP;
2137}
2a91525c 2138EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2139
2140int sock_no_listen(struct socket *sock, int backlog)
2141{
2142 return -EOPNOTSUPP;
2143}
2a91525c 2144EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2145
2146int sock_no_shutdown(struct socket *sock, int how)
2147{
2148 return -EOPNOTSUPP;
2149}
2a91525c 2150EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2151
2152int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2153 char __user *optval, unsigned int optlen)
1da177e4
LT		 2154{
2155 return -EOPNOTSUPP;
2156}
2a91525c 2157EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2158
2159int sock_no_getsockopt(struct socket *sock, int level, int optname,
2160 char __user *optval, int __user *optlen)
2161{
2162 return -EOPNOTSUPP;
2163}
2a91525c 2164EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4 2165
1b784140 2166int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
1da177e4
LT		 2167{
2168 return -EOPNOTSUPP;
2169}
2a91525c 2170EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4 2171
1b784140
YX		 2172int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2173 int flags)
1da177e4
LT		 2174{
2175 return -EOPNOTSUPP;
2176}
2a91525c 2177EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2178
2179int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2180{
2181 /* Mirror missing mmap method error code */
2182 return -ENODEV;
2183}
2a91525c 2184EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2185
2186ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2187{
2188 ssize_t res;
2189 struct msghdr msg = {.msg_flags = flags};
2190 struct kvec iov;
2191 char *kaddr = kmap(page);
2192 iov.iov_base = kaddr + offset;
2193 iov.iov_len = size;
2194 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2195 kunmap(page);
2196 return res;
2197}
2a91525c 2198EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2199
2200/*
2201 * Default Socket Callbacks
2202 */
2203
2204static void sock_def_wakeup(struct sock *sk)
2205{
43815482
ED		 2206 struct socket_wq *wq;
2207
2208 rcu_read_lock();
2209 wq = rcu_dereference(sk->sk_wq);
2210 if (wq_has_sleeper(wq))
2211 wake_up_interruptible_all(&wq->wait);
2212 rcu_read_unlock();
1da177e4
LT		 2213}
2214
2215static void sock_def_error_report(struct sock *sk)
2216{
43815482
ED		 2217 struct socket_wq *wq;
2218
2219 rcu_read_lock();
2220 wq = rcu_dereference(sk->sk_wq);
2221 if (wq_has_sleeper(wq))
2222 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2223 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2224 rcu_read_unlock();
1da177e4
LT		 2225}
2226
676d2369 2227static void sock_def_readable(struct sock *sk)
1da177e4 2228{
43815482
ED		 2229 struct socket_wq *wq;
2230
2231 rcu_read_lock();
2232 wq = rcu_dereference(sk->sk_wq);
2233 if (wq_has_sleeper(wq))
2c6607c6 2234 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2235 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2236 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2237 rcu_read_unlock();
1da177e4
LT		 2238}
2239
2240static void sock_def_write_space(struct sock *sk)
2241{
43815482
ED		 2242 struct socket_wq *wq;
2243
2244 rcu_read_lock();
1da177e4
LT		 2245
2246 /* Do not wake up a writer until he can make "significant"
2247 * progress. --DaveM
2248 */
e71a4783 2249 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2250 wq = rcu_dereference(sk->sk_wq);
2251 if (wq_has_sleeper(wq))
2252 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2253 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2254
2255 /* Should agree with poll, otherwise some programs break */
2256 if (sock_writeable(sk))
8d8ad9d7 2257 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2258 }
2259
43815482 2260 rcu_read_unlock();
1da177e4
LT		 2261}
2262
2263static void sock_def_destruct(struct sock *sk)
2264{
a51482bd 2265 kfree(sk->sk_protinfo);
1da177e4
LT		 2266}
2267
2268void sk_send_sigurg(struct sock *sk)
2269{
2270 if (sk->sk_socket && sk->sk_socket->file)
2271 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2272 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2273}
2a91525c 2274EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2275
2276void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2277 unsigned long expires)
2278{
2279 if (!mod_timer(timer, expires))
2280 sock_hold(sk);
2281}
1da177e4
LT		 2282EXPORT_SYMBOL(sk_reset_timer);
2283
2284void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2285{
25cc4ae9 2286 if (del_timer(timer))
1da177e4
LT		 2287 __sock_put(sk);
2288}
1da177e4
LT		 2289EXPORT_SYMBOL(sk_stop_timer);
2290
2291void sock_init_data(struct socket *sock, struct sock *sk)
2292{
2293 skb_queue_head_init(&sk->sk_receive_queue);
2294 skb_queue_head_init(&sk->sk_write_queue);
2295 skb_queue_head_init(&sk->sk_error_queue);
2296
2297 sk->sk_send_head = NULL;
2298
2299 init_timer(&sk->sk_timer);
4ec93edb 2300
1da177e4
LT		 2301 sk->sk_allocation = GFP_KERNEL;
2302 sk->sk_rcvbuf = sysctl_rmem_default;
2303 sk->sk_sndbuf = sysctl_wmem_default;
2304 sk->sk_state = TCP_CLOSE;
972692e0 2305 sk_set_socket(sk, sock);
1da177e4
LT		 2306
2307 sock_set_flag(sk, SOCK_ZAPPED);
2308
e71a4783 2309 if (sock) {
1da177e4 2310 sk->sk_type = sock->type;
43815482 2311 sk->sk_wq = sock->wq;
1da177e4
LT		 2312 sock->sk = sk;
2313 } else
43815482 2314 sk->sk_wq = NULL;
1da177e4 2315
b6c6712a 2316 spin_lock_init(&sk->sk_dst_lock);
1da177e4 2317 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2318 lockdep_set_class_and_name(&sk->sk_callback_lock,
2319 af_callback_keys + sk->sk_family,
2320 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2321
2322 sk->sk_state_change = sock_def_wakeup;
2323 sk->sk_data_ready = sock_def_readable;
2324 sk->sk_write_space = sock_def_write_space;
2325 sk->sk_error_report = sock_def_error_report;
2326 sk->sk_destruct = sock_def_destruct;
2327
5640f768
ED		 2328 sk->sk_frag.page = NULL;
2329 sk->sk_frag.offset = 0;
ef64a54f 2330 sk->sk_peek_off = -1;
1da177e4 2331
109f6e39
EB		 2332 sk->sk_peer_pid = NULL;
2333 sk->sk_peer_cred = NULL;
1da177e4
LT		 2334 sk->sk_write_pending = 0;
2335 sk->sk_rcvlowat = 1;
2336 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2337 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2338
f37f0afb 2339 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2340
e0d1095a 2341#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2342 sk->sk_napi_id = 0;
64b0dc51 2343 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2344#endif
2345
62748f32 2346 sk->sk_max_pacing_rate = ~0U;
7eec4174 2347 sk->sk_pacing_rate = ~0U;
4dc6dc71
ED		 2348 /*
2349 * Before updating sk_refcnt, we must commit prior changes to memory
2350 * (Documentation/RCU/rculist_nulls.txt for details)
2351 */
2352 smp_wmb();
1da177e4 2353 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2354 atomic_set(&sk->sk_drops, 0);
1da177e4 2355}
2a91525c 2356EXPORT_SYMBOL(sock_init_data);
1da177e4 2357
b5606c2d 2358void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2359{
2360 might_sleep();
a5b5bb9a 2361 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2362 if (sk->sk_lock.owned)
1da177e4 2363 __lock_sock(sk);
d2e9117c 2364 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2365 spin_unlock(&sk->sk_lock.slock);
2366 /*
2367 * The sk_lock has mutex_lock() semantics here:
2368 */
fcc70d5f 2369 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2370 local_bh_enable();
1da177e4 2371}
fcc70d5f 2372EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2373
b5606c2d 2374void release_sock(struct sock *sk)
1da177e4 2375{
a5b5bb9a
IM		 2376 /*
2377 * The sk_lock has mutex_unlock() semantics:
2378 */
2379 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2380
2381 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2382 if (sk->sk_backlog.tail)
2383 __release_sock(sk);
46d3ceab 2384
c3f9b018
ED		 2385 /* Warning : release_cb() might need to release sk ownership,
2386 * ie call sock_release_ownership(sk) before us.
2387 */
46d3ceab
ED		 2388 if (sk->sk_prot->release_cb)
2389 sk->sk_prot->release_cb(sk);
2390
c3f9b018 2391 sock_release_ownership(sk);
a5b5bb9a
IM		 2392 if (waitqueue_active(&sk->sk_lock.wq))
2393 wake_up(&sk->sk_lock.wq);
2394 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2395}
2396EXPORT_SYMBOL(release_sock);
2397
8a74ad60
ED		 2398/**
2399 * lock_sock_fast - fast version of lock_sock
2400 * @sk: socket
2401 *
2402 * This version should be used for very small section, where process wont block
2403 * return false if fast path is taken
2404 * sk_lock.slock locked, owned = 0, BH disabled
2405 * return true if slow path is taken
2406 * sk_lock.slock unlocked, owned = 1, BH enabled
2407 */
2408bool lock_sock_fast(struct sock *sk)
2409{
2410 might_sleep();
2411 spin_lock_bh(&sk->sk_lock.slock);
2412
2413 if (!sk->sk_lock.owned)
2414 /*
2415 * Note : We must disable BH
2416 */
2417 return false;
2418
2419 __lock_sock(sk);
2420 sk->sk_lock.owned = 1;
2421 spin_unlock(&sk->sk_lock.slock);
2422 /*
2423 * The sk_lock has mutex_lock() semantics here:
2424 */
2425 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2426 local_bh_enable();
2427 return true;
2428}
2429EXPORT_SYMBOL(lock_sock_fast);
2430
1da177e4 2431int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2432{
b7aa0bf7 2433 struct timeval tv;
1da177e4 2434 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2435 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2436 tv = ktime_to_timeval(sk->sk_stamp);
2437 if (tv.tv_sec == -1)
1da177e4 2438 return -ENOENT;
b7aa0bf7
ED		 2439 if (tv.tv_sec == 0) {
2440 sk->sk_stamp = ktime_get_real();
2441 tv = ktime_to_timeval(sk->sk_stamp);
2442 }
2443 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2444}
1da177e4
LT		 2445EXPORT_SYMBOL(sock_get_timestamp);
2446
ae40eb1e
ED		 2447int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2448{
2449 struct timespec ts;
2450 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2451 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2452 ts = ktime_to_timespec(sk->sk_stamp);
2453 if (ts.tv_sec == -1)
2454 return -ENOENT;
2455 if (ts.tv_sec == 0) {
2456 sk->sk_stamp = ktime_get_real();
2457 ts = ktime_to_timespec(sk->sk_stamp);
2458 }
2459 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2460}
2461EXPORT_SYMBOL(sock_get_timestampns);
2462
20d49473 2463void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2464{
20d49473 2465 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2466 unsigned long previous_flags = sk->sk_flags;
2467
20d49473
PO		 2468 sock_set_flag(sk, flag);
2469 /*
2470 * we just set one of the two flags which require net
2471 * time stamping, but time stamping might have been on
2472 * already because of the other one
2473 */
08e29af3 2474 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2475 net_enable_timestamp();
1da177e4
LT		 2476 }
2477}
1da177e4 2478
cb820f8e
RC		 2479int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2480 int level, int type)
2481{
2482 struct sock_exterr_skb *serr;
364a9e93 2483 struct sk_buff *skb;
cb820f8e
RC		 2484 int copied, err;
2485
2486 err = -EAGAIN;
364a9e93 2487 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 2488 if (skb == NULL)
2489 goto out;
2490
2491 copied = skb->len;
2492 if (copied > len) {
2493 msg->msg_flags |= MSG_TRUNC;
2494 copied = len;
2495 }
51f3d02b 2496 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 2497 if (err)
2498 goto out_free_skb;
2499
2500 sock_recv_timestamp(msg, sk, skb);
2501
2502 serr = SKB_EXT_ERR(skb);
2503 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2504
2505 msg->msg_flags |= MSG_ERRQUEUE;
2506 err = copied;
2507
cb820f8e
RC		 2508out_free_skb:
2509 kfree_skb(skb);
2510out:
2511 return err;
2512}
2513EXPORT_SYMBOL(sock_recv_errqueue);
2514
1da177e4
LT		 2515/*
2516 * Get a socket option on an socket.
2517 *
2518 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2519 * asynchronous errors should be reported by getsockopt. We assume
2520 * this means if you specify SO_ERROR (otherwise whats the point of it).
2521 */
2522int sock_common_getsockopt(struct socket *sock, int level, int optname,
2523 char __user *optval, int __user *optlen)
2524{
2525 struct sock *sk = sock->sk;
2526
2527 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2528}
1da177e4
LT		 2529EXPORT_SYMBOL(sock_common_getsockopt);
2530
3fdadf7d 2531#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2532int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2533 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2534{
2535 struct sock *sk = sock->sk;
2536
1e51f951 2537 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2538 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2539 optval, optlen);
3fdadf7d
DM		 2540 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2541}
2542EXPORT_SYMBOL(compat_sock_common_getsockopt);
2543#endif
2544
1b784140
YX		 2545int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2546 int flags)
1da177e4
LT		 2547{
2548 struct sock *sk = sock->sk;
2549 int addr_len = 0;
2550 int err;
2551
1b784140 2552 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
1da177e4
LT		 2553 flags & ~MSG_DONTWAIT, &addr_len);
2554 if (err >= 0)
2555 msg->msg_namelen = addr_len;
2556 return err;
2557}
1da177e4
LT		 2558EXPORT_SYMBOL(sock_common_recvmsg);
2559
2560/*
2561 * Set socket options on an inet socket.
2562 */
2563int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2564 char __user *optval, unsigned int optlen)
1da177e4
LT		 2565{
2566 struct sock *sk = sock->sk;
2567
2568 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2569}
1da177e4
LT		 2570EXPORT_SYMBOL(sock_common_setsockopt);
2571
3fdadf7d 2572#ifdef CONFIG_COMPAT
543d9cfe 2573int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2574 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2575{
2576 struct sock *sk = sock->sk;
2577
543d9cfe
ACM		 2578 if (sk->sk_prot->compat_setsockopt != NULL)
2579 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2580 optval, optlen);
3fdadf7d
DM		 2581 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2582}
2583EXPORT_SYMBOL(compat_sock_common_setsockopt);
2584#endif
2585
1da177e4
LT		 2586void sk_common_release(struct sock *sk)
2587{
2588 if (sk->sk_prot->destroy)
2589 sk->sk_prot->destroy(sk);
2590
2591 /*
2592 * Observation: when sock_common_release is called, processes have
2593 * no access to socket. But net still has.
2594 * Step one, detach it from networking:
2595 *
2596 * A. Remove from hash tables.
2597 */
2598
2599 sk->sk_prot->unhash(sk);
2600
2601 /*
2602 * In this point socket cannot receive new packets, but it is possible
2603 * that some packets are in flight because some CPU runs receiver and
2604 * did hash table lookup before we unhashed socket. They will achieve
2605 * receive queue and will be purged by socket destructor.
2606 *
2607 * Also we still have packets pending on receive queue and probably,
2608 * our own packets waiting in device queues. sock_destroy will drain
2609 * receive queue, but transmitted packets will delay socket destruction
2610 * until the last reference will be released.
2611 */
2612
2613 sock_orphan(sk);
2614
2615 xfrm_sk_free_policy(sk);
2616
e6848976 2617 sk_refcnt_debug_release(sk);
5640f768
ED		 2618
2619 if (sk->sk_frag.page) {
2620 put_page(sk->sk_frag.page);
2621 sk->sk_frag.page = NULL;
2622 }
2623
1da177e4
LT		 2624 sock_put(sk);
2625}
1da177e4
LT		 2626EXPORT_SYMBOL(sk_common_release);
2627
13ff3d6f
PE		 2628#ifdef CONFIG_PROC_FS
2629#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2630struct prot_inuse {
2631 int val[PROTO_INUSE_NR];
2632};
13ff3d6f
PE		 2633
2634static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2635
2636#ifdef CONFIG_NET_NS
2637void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2638{
d6d9ca0f 2639 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2640}
2641EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2642
2643int sock_prot_inuse_get(struct net *net, struct proto *prot)
2644{
2645 int cpu, idx = prot->inuse_idx;
2646 int res = 0;
2647
2648 for_each_possible_cpu(cpu)
2649 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2650
2651 return res >= 0 ? res : 0;
2652}
2653EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2654
2c8c1e72 2655static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2656{
2657 net->core.inuse = alloc_percpu(struct prot_inuse);
2658 return net->core.inuse ? 0 : -ENOMEM;
2659}
2660
2c8c1e72 2661static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2662{
2663 free_percpu(net->core.inuse);
2664}
2665
2666static struct pernet_operations net_inuse_ops = {
2667 .init = sock_inuse_init_net,
2668 .exit = sock_inuse_exit_net,
2669};
2670
2671static __init int net_inuse_init(void)
2672{
2673 if (register_pernet_subsys(&net_inuse_ops))
2674 panic("Cannot initialize net inuse counters");
2675
2676 return 0;
2677}
2678
2679core_initcall(net_inuse_init);
2680#else
1338d466
PE		 2681static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2682
c29a0bc4 2683void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2684{
d6d9ca0f 2685 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2686}
2687EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2688
c29a0bc4 2689int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2690{
2691 int cpu, idx = prot->inuse_idx;
2692 int res = 0;
2693
2694 for_each_possible_cpu(cpu)
2695 res += per_cpu(prot_inuse, cpu).val[idx];
2696
2697 return res >= 0 ? res : 0;
2698}
2699EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2700#endif
13ff3d6f
PE		 2701
2702static void assign_proto_idx(struct proto *prot)
2703{
2704 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2705
2706 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2707 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2708 return;
2709 }
2710
2711 set_bit(prot->inuse_idx, proto_inuse_idx);
2712}
2713
2714static void release_proto_idx(struct proto *prot)
2715{
2716 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2717 clear_bit(prot->inuse_idx, proto_inuse_idx);
2718}
2719#else
2720static inline void assign_proto_idx(struct proto *prot)
2721{
2722}
2723
2724static inline void release_proto_idx(struct proto *prot)
2725{
2726}
2727#endif
2728
b733c007
PE		 2729int proto_register(struct proto *prot, int alloc_slab)
2730{
1da177e4
LT		 2731 if (alloc_slab) {
2732 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2733 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2734 NULL);
1da177e4
LT		 2735
2736 if (prot->slab == NULL) {
e005d193
JP		 2737 pr_crit("%s: Can't create sock SLAB cache!\n",
2738 prot->name);
60e7663d 2739 goto out;
1da177e4 2740 }
2e6599cb
ACM		 2741
2742 if (prot->rsk_prot != NULL) {
faf23422 2743 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2744 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2745 goto out_free_sock_slab;
2746
7e56b5d6 2747 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2748 prot->rsk_prot->obj_size, 0,
20c2df83 2749 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2750
2751 if (prot->rsk_prot->slab == NULL) {
e005d193
JP		 2752 pr_crit("%s: Can't create request sock SLAB cache!\n",
2753 prot->name);
2e6599cb
ACM		 2754 goto out_free_request_sock_slab_name;
2755 }
2756 }
8feaf0c0 2757
6d6ee43e 2758 if (prot->twsk_prot != NULL) {
faf23422 2759 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2760
7e56b5d6 2761 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2762 goto out_free_request_sock_slab;
2763
6d6ee43e 2764 prot->twsk_prot->twsk_slab =
7e56b5d6 2765 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2766 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2767 0,
2768 SLAB_HWCACHE_ALIGN |
2769 prot->slab_flags,
20c2df83 2770 NULL);
6d6ee43e 2771 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2772 goto out_free_timewait_sock_slab_name;
2773 }
1da177e4
LT		 2774 }
2775
36b77a52 2776 mutex_lock(&proto_list_mutex);
1da177e4 2777 list_add(&prot->node, &proto_list);
13ff3d6f 2778 assign_proto_idx(prot);
36b77a52 2779 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2780 return 0;
2781
8feaf0c0 2782out_free_timewait_sock_slab_name:
7e56b5d6 2783 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2784out_free_request_sock_slab:
2785 if (prot->rsk_prot && prot->rsk_prot->slab) {
2786 kmem_cache_destroy(prot->rsk_prot->slab);
2787 prot->rsk_prot->slab = NULL;
2788 }
2e6599cb 2789out_free_request_sock_slab_name:
72150e9b
DC		 2790 if (prot->rsk_prot)
2791 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2792out_free_sock_slab:
2793 kmem_cache_destroy(prot->slab);
2794 prot->slab = NULL;
b733c007
PE		 2795out:
2796 return -ENOBUFS;
1da177e4 2797}
1da177e4
LT		 2798EXPORT_SYMBOL(proto_register);
2799
2800void proto_unregister(struct proto *prot)
2801{
36b77a52 2802 mutex_lock(&proto_list_mutex);
13ff3d6f 2803 release_proto_idx(prot);
0a3f4358 2804 list_del(&prot->node);
36b77a52 2805 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2806
2807 if (prot->slab != NULL) {
2808 kmem_cache_destroy(prot->slab);
2809 prot->slab = NULL;
2810 }
2811
2e6599cb 2812 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2813 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2814 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2815 prot->rsk_prot->slab = NULL;
2816 }
2817
6d6ee43e 2818 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2819 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2820 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2821 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2822 }
1da177e4 2823}
1da177e4
LT		 2824EXPORT_SYMBOL(proto_unregister);
2825
2826#ifdef CONFIG_PROC_FS
1da177e4 2827static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2828 __acquires(proto_list_mutex)
1da177e4 2829{
36b77a52 2830 mutex_lock(&proto_list_mutex);
60f0438a 2831 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2832}
2833
2834static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2835{
60f0438a 2836 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2837}
2838
2839static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2840 __releases(proto_list_mutex)
1da177e4 2841{
36b77a52 2842 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2843}
2844
2845static char proto_method_implemented(const void *method)
2846{
2847 return method == NULL ? 'n' : 'y';
2848}
180d8cd9
GC		 2849static long sock_prot_memory_allocated(struct proto *proto)
2850{
cb75a36c 2851 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2852}
2853
2854static char *sock_prot_memory_pressure(struct proto *proto)
2855{
2856 return proto->memory_pressure != NULL ?
2857 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2858}
1da177e4
LT		 2859
2860static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2861{
180d8cd9 2862
8d987e5c 2863 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2864 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2865 proto->name,
2866 proto->obj_size,
14e943db 2867 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2868 sock_prot_memory_allocated(proto),
2869 sock_prot_memory_pressure(proto),
1da177e4
LT		 2870 proto->max_header,
2871 proto->slab == NULL ? "no" : "yes",
2872 module_name(proto->owner),
2873 proto_method_implemented(proto->close),
2874 proto_method_implemented(proto->connect),
2875 proto_method_implemented(proto->disconnect),
2876 proto_method_implemented(proto->accept),
2877 proto_method_implemented(proto->ioctl),
2878 proto_method_implemented(proto->init),
2879 proto_method_implemented(proto->destroy),
2880 proto_method_implemented(proto->shutdown),
2881 proto_method_implemented(proto->setsockopt),
2882 proto_method_implemented(proto->getsockopt),
2883 proto_method_implemented(proto->sendmsg),
2884 proto_method_implemented(proto->recvmsg),
2885 proto_method_implemented(proto->sendpage),
2886 proto_method_implemented(proto->bind),
2887 proto_method_implemented(proto->backlog_rcv),
2888 proto_method_implemented(proto->hash),
2889 proto_method_implemented(proto->unhash),
2890 proto_method_implemented(proto->get_port),
2891 proto_method_implemented(proto->enter_memory_pressure));
2892}
2893
2894static int proto_seq_show(struct seq_file *seq, void *v)
2895{
60f0438a 2896 if (v == &proto_list)
1da177e4
LT		 2897 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2898 "protocol",
2899 "size",
2900 "sockets",
2901 "memory",
2902 "press",
2903 "maxhdr",
2904 "slab",
2905 "module",
2906 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2907 else
60f0438a 2908 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2909 return 0;
2910}
2911
f690808e 2912static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2913 .start = proto_seq_start,
2914 .next = proto_seq_next,
2915 .stop = proto_seq_stop,
2916 .show = proto_seq_show,
2917};
2918
2919static int proto_seq_open(struct inode *inode, struct file *file)
2920{
14e943db
ED		 2921 return seq_open_net(inode, file, &proto_seq_ops,
2922 sizeof(struct seq_net_private));
1da177e4
LT		 2923}
2924
9a32144e 2925static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2926 .owner = THIS_MODULE,
2927 .open = proto_seq_open,
2928 .read = seq_read,
2929 .llseek = seq_lseek,
14e943db
ED		 2930 .release = seq_release_net,
2931};
2932
2933static __net_init int proto_init_net(struct net *net)
2934{
d4beaa66 2935 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 2936 return -ENOMEM;
2937
2938 return 0;
2939}
2940
2941static __net_exit void proto_exit_net(struct net *net)
2942{
ece31ffd 2943 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 2944}
2945
2946
2947static __net_initdata struct pernet_operations proto_net_ops = {
2948 .init = proto_init_net,
2949 .exit = proto_exit_net,
1da177e4
LT		 2950};
2951
2952static int __init proto_init(void)
2953{
14e943db 2954 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2955}
2956
2957subsys_initcall(proto_init);
2958
2959#endif /* PROC_FS */
Linux kernel - Deliverables
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