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Merge branches 'acpi-resources', 'acpi-battery', 'acpi-doc' and 'acpi-pnp'
[linux-2.6-block.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
4ec93edb 35 * code. The ACK stuff can wait and needs major
1da177e4
LT		 36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 *
85 *
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
90 */
91
e005d193
JP		 92#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
93
4fc268d2 94#include <linux/capability.h>
1da177e4 95#include <linux/errno.h>
cb820f8e 96#include <linux/errqueue.h>
1da177e4
LT		 97#include <linux/types.h>
98#include <linux/socket.h>
99#include <linux/in.h>
100#include <linux/kernel.h>
1da177e4
LT		 101#include <linux/module.h>
102#include <linux/proc_fs.h>
103#include <linux/seq_file.h>
104#include <linux/sched.h>
105#include <linux/timer.h>
106#include <linux/string.h>
107#include <linux/sockios.h>
108#include <linux/net.h>
109#include <linux/mm.h>
110#include <linux/slab.h>
111#include <linux/interrupt.h>
112#include <linux/poll.h>
113#include <linux/tcp.h>
114#include <linux/init.h>
a1f8e7f7 115#include <linux/highmem.h>
3f551f94 116#include <linux/user_namespace.h>
c5905afb 117#include <linux/static_key.h>
3969eb38 118#include <linux/memcontrol.h>
8c1ae10d 119#include <linux/prefetch.h>
1da177e4
LT		 120
121#include <asm/uaccess.h>
1da177e4
LT		 122
123#include <linux/netdevice.h>
124#include <net/protocol.h>
125#include <linux/skbuff.h>
457c4cbc 126#include <net/net_namespace.h>
2e6599cb 127#include <net/request_sock.h>
1da177e4 128#include <net/sock.h>
20d49473 129#include <linux/net_tstamp.h>
1da177e4
LT		 130#include <net/xfrm.h>
131#include <linux/ipsec.h>
f8451725 132#include <net/cls_cgroup.h>
5bc1421e 133#include <net/netprio_cgroup.h>
1da177e4
LT		 134
135#include <linux/filter.h>
136
3847ce32
SM		 137#include <trace/events/sock.h>
138
1da177e4
LT		 139#ifdef CONFIG_INET
140#include <net/tcp.h>
141#endif
142
076bb0c8 143#include <net/busy_poll.h>
06021292 144
36b77a52 145static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 146static LIST_HEAD(proto_list);
147
a3b299da
EB		 148/**
149 * sk_ns_capable - General socket capability test
150 * @sk: Socket to use a capability on or through
151 * @user_ns: The user namespace of the capability to use
152 * @cap: The capability to use
153 *
154 * Test to see if the opener of the socket had when the socket was
155 * created and the current process has the capability @cap in the user
156 * namespace @user_ns.
157 */
158bool sk_ns_capable(const struct sock *sk,
159 struct user_namespace *user_ns, int cap)
160{
161 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
162 ns_capable(user_ns, cap);
163}
164EXPORT_SYMBOL(sk_ns_capable);
165
166/**
167 * sk_capable - Socket global capability test
168 * @sk: Socket to use a capability on or through
e793c0f7 169 * @cap: The global capability to use
a3b299da
EB		 170 *
171 * Test to see if the opener of the socket had when the socket was
172 * created and the current process has the capability @cap in all user
173 * namespaces.
174 */
175bool sk_capable(const struct sock *sk, int cap)
176{
177 return sk_ns_capable(sk, &init_user_ns, cap);
178}
179EXPORT_SYMBOL(sk_capable);
180
181/**
182 * sk_net_capable - Network namespace socket capability test
183 * @sk: Socket to use a capability on or through
184 * @cap: The capability to use
185 *
e793c0f7 186 * Test to see if the opener of the socket had when the socket was created
a3b299da
EB		 187 * and the current process has the capability @cap over the network namespace
188 * the socket is a member of.
189 */
190bool sk_net_capable(const struct sock *sk, int cap)
191{
192 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
193}
194EXPORT_SYMBOL(sk_net_capable);
195
196
c255a458 197#ifdef CONFIG_MEMCG_KMEM
1d62e436 198int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
d1a4c0b3
GC		 199{
200 struct proto *proto;
201 int ret = 0;
202
36b77a52 203 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 204 list_for_each_entry(proto, &proto_list, node) {
205 if (proto->init_cgroup) {
1d62e436 206 ret = proto->init_cgroup(memcg, ss);
d1a4c0b3
GC		 207 if (ret)
208 goto out;
209 }
210 }
211
36b77a52 212 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 213 return ret;
214out:
215 list_for_each_entry_continue_reverse(proto, &proto_list, node)
216 if (proto->destroy_cgroup)
1d62e436 217 proto->destroy_cgroup(memcg);
36b77a52 218 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 219 return ret;
220}
221
1d62e436 222void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
d1a4c0b3
GC		 223{
224 struct proto *proto;
225
36b77a52 226 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 227 list_for_each_entry_reverse(proto, &proto_list, node)
228 if (proto->destroy_cgroup)
1d62e436 229 proto->destroy_cgroup(memcg);
36b77a52 230 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 231}
232#endif
233
da21f24d
IM		 234/*
235 * Each address family might have different locking rules, so we have
236 * one slock key per address family:
237 */
a5b5bb9a
IM		 238static struct lock_class_key af_family_keys[AF_MAX];
239static struct lock_class_key af_family_slock_keys[AF_MAX];
240
cbda4eaf 241#if defined(CONFIG_MEMCG_KMEM)
c5905afb 242struct static_key memcg_socket_limit_enabled;
e1aab161 243EXPORT_SYMBOL(memcg_socket_limit_enabled);
cbda4eaf 244#endif
e1aab161 245
a5b5bb9a
IM		 246/*
247 * Make lock validator output more readable. (we pre-construct these
248 * strings build-time, so that runtime initialization of socket
249 * locks is fast):
250 */
36cbd3dc 251static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 252 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
253 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
254 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
255 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
256 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
257 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
258 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 259 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 260 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 261 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 262 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 263 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 264 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
456db6a4 265 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX"
a5b5bb9a 266};
36cbd3dc 267static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 268 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
269 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
270 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
271 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
272 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
273 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
274 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 275 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 276 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 277 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 278 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 279 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 280 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
456db6a4 281 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX"
a5b5bb9a 282};
36cbd3dc 283static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 284 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
285 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
286 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
287 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
288 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
289 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
290 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 291 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 292 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 293 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 294 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 295 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 296 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
456db6a4 297 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX"
443aef0e 298};
da21f24d
IM		 299
300/*
301 * sk_callback_lock locking rules are per-address-family,
302 * so split the lock classes by using a per-AF key:
303 */
304static struct lock_class_key af_callback_keys[AF_MAX];
305
1da177e4
LT		 306/* Take into consideration the size of the struct sk_buff overhead in the
307 * determination of these values, since that is non-constant across
308 * platforms. This makes socket queueing behavior and performance
309 * not depend upon such differences.
310 */
311#define _SK_MEM_PACKETS 256
87fb4b7b 312#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 313#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
314#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
315
316/* Run time adjustable parameters. */
ab32ea5d 317__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 318EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 319__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 320EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 321__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
322__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 323
25985edc 324/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 325int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 326EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 327
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
f60e5990 656bool sk_mc_loop(struct sock *sk)
657{
658 if (dev_recursion_level())
659 return false;
660 if (!sk)
661 return true;
662 switch (sk->sk_family) {
663 case AF_INET:
664 return inet_sk(sk)->mc_loop;
665#if IS_ENABLED(CONFIG_IPV6)
666 case AF_INET6:
667 return inet6_sk(sk)->mc_loop;
668#endif
669 }
670 WARN_ON(1);
671 return true;
672}
673EXPORT_SYMBOL(sk_mc_loop);
674
1da177e4
LT		 675/*
676 * This is meant for all protocols to use and covers goings on
677 * at the socket level. Everything here is generic.
678 */
679
680int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 681 char __user *optval, unsigned int optlen)
1da177e4 682{
2a91525c 683 struct sock *sk = sock->sk;
1da177e4
LT		 684 int val;
685 int valbool;
686 struct linger ling;
687 int ret = 0;
4ec93edb 688
1da177e4
LT		 689 /*
690 * Options without arguments
691 */
692
4878809f 693 if (optname == SO_BINDTODEVICE)
c91f6df2 694 return sock_setbindtodevice(sk, optval, optlen);
4878809f 695
e71a4783
SH		 696 if (optlen < sizeof(int))
697 return -EINVAL;
4ec93edb 698
1da177e4
LT		 699 if (get_user(val, (int __user *)optval))
700 return -EFAULT;
4ec93edb 701
2a91525c 702 valbool = val ? 1 : 0;
1da177e4
LT		 703
704 lock_sock(sk);
705
2a91525c 706 switch (optname) {
e71a4783 707 case SO_DEBUG:
2a91525c 708 if (val && !capable(CAP_NET_ADMIN))
e71a4783 709 ret = -EACCES;
2a91525c 710 else
c0ef877b 711 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 712 break;
713 case SO_REUSEADDR:
4a17fd52 714 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 715 break;
055dc21a
TH		 716 case SO_REUSEPORT:
717 sk->sk_reuseport = valbool;
718 break;
e71a4783 719 case SO_TYPE:
49c794e9 720 case SO_PROTOCOL:
0d6038ee 721 case SO_DOMAIN:
e71a4783
SH		 722 case SO_ERROR:
723 ret = -ENOPROTOOPT;
724 break;
725 case SO_DONTROUTE:
c0ef877b 726 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 727 break;
728 case SO_BROADCAST:
729 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
730 break;
731 case SO_SNDBUF:
732 /* Don't error on this BSD doesn't and if you think
82981930
ED		 733 * about it this is right. Otherwise apps have to
734 * play 'guess the biggest size' games. RCVBUF/SNDBUF
735 * are treated in BSD as hints
736 */
737 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 738set_sndbuf:
e71a4783 739 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 740 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
741 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 742 sk->sk_write_space(sk);
743 break;
1da177e4 744
e71a4783
SH		 745 case SO_SNDBUFFORCE:
746 if (!capable(CAP_NET_ADMIN)) {
747 ret = -EPERM;
748 break;
749 }
750 goto set_sndbuf;
b0573dea 751
e71a4783
SH		 752 case SO_RCVBUF:
753 /* Don't error on this BSD doesn't and if you think
82981930
ED		 754 * about it this is right. Otherwise apps have to
755 * play 'guess the biggest size' games. RCVBUF/SNDBUF
756 * are treated in BSD as hints
757 */
758 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 759set_rcvbuf:
e71a4783
SH		 760 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
761 /*
762 * We double it on the way in to account for
763 * "struct sk_buff" etc. overhead. Applications
764 * assume that the SO_RCVBUF setting they make will
765 * allow that much actual data to be received on that
766 * socket.
767 *
768 * Applications are unaware that "struct sk_buff" and
769 * other overheads allocate from the receive buffer
770 * during socket buffer allocation.
771 *
772 * And after considering the possible alternatives,
773 * returning the value we actually used in getsockopt
774 * is the most desirable behavior.
775 */
82981930 776 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 777 break;
778
779 case SO_RCVBUFFORCE:
780 if (!capable(CAP_NET_ADMIN)) {
781 ret = -EPERM;
1da177e4 782 break;
e71a4783
SH		 783 }
784 goto set_rcvbuf;
1da177e4 785
e71a4783 786 case SO_KEEPALIVE:
1da177e4 787#ifdef CONFIG_INET
3e10986d
ED		 788 if (sk->sk_protocol == IPPROTO_TCP &&
789 sk->sk_type == SOCK_STREAM)
e71a4783 790 tcp_set_keepalive(sk, valbool);
1da177e4 791#endif
e71a4783
SH		 792 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
793 break;
794
795 case SO_OOBINLINE:
796 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
797 break;
798
799 case SO_NO_CHECK:
28448b80 800 sk->sk_no_check_tx = valbool;
e71a4783
SH		 801 break;
802
803 case SO_PRIORITY:
5e1fccc0
EB		 804 if ((val >= 0 && val <= 6) ||
805 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 806 sk->sk_priority = val;
807 else
808 ret = -EPERM;
809 break;
810
811 case SO_LINGER:
812 if (optlen < sizeof(ling)) {
813 ret = -EINVAL; /* 1003.1g */
1da177e4 814 break;
e71a4783 815 }
2a91525c 816 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 817 ret = -EFAULT;
1da177e4 818 break;
e71a4783
SH		 819 }
820 if (!ling.l_onoff)
821 sock_reset_flag(sk, SOCK_LINGER);
822 else {
1da177e4 823#if (BITS_PER_LONG == 32)
e71a4783
SH		 824 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
825 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 826 else
e71a4783
SH		 827#endif
828 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
829 sock_set_flag(sk, SOCK_LINGER);
830 }
831 break;
832
833 case SO_BSDCOMPAT:
834 sock_warn_obsolete_bsdism("setsockopt");
835 break;
836
837 case SO_PASSCRED:
838 if (valbool)
839 set_bit(SOCK_PASSCRED, &sock->flags);
840 else
841 clear_bit(SOCK_PASSCRED, &sock->flags);
842 break;
843
844 case SO_TIMESTAMP:
92f37fd2 845 case SO_TIMESTAMPNS:
e71a4783 846 if (valbool) {
92f37fd2
ED		 847 if (optname == SO_TIMESTAMP)
848 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
849 else
850 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 851 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 852 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 853 } else {
e71a4783 854 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 855 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
856 }
e71a4783
SH		 857 break;
858
20d49473
PO		 859 case SO_TIMESTAMPING:
860 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 861 ret = -EINVAL;
20d49473
PO		 862 break;
863 }
b245be1f 864
09c2d251 865 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765
WB		 866 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
867 if (sk->sk_protocol == IPPROTO_TCP) {
868 if (sk->sk_state != TCP_ESTABLISHED) {
869 ret = -EINVAL;
870 break;
871 }
872 sk->sk_tskey = tcp_sk(sk)->snd_una;
873 } else {
874 sk->sk_tskey = 0;
875 }
876 }
b9f40e21 877 sk->sk_tsflags = val;
20d49473
PO		 878 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
879 sock_enable_timestamp(sk,
880 SOCK_TIMESTAMPING_RX_SOFTWARE);
881 else
882 sock_disable_timestamp(sk,
08e29af3 883 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 884 break;
885
e71a4783
SH		 886 case SO_RCVLOWAT:
887 if (val < 0)
888 val = INT_MAX;
889 sk->sk_rcvlowat = val ? : 1;
890 break;
891
892 case SO_RCVTIMEO:
893 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
894 break;
895
896 case SO_SNDTIMEO:
897 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
898 break;
1da177e4 899
e71a4783
SH		 900 case SO_ATTACH_FILTER:
901 ret = -EINVAL;
902 if (optlen == sizeof(struct sock_fprog)) {
903 struct sock_fprog fprog;
1da177e4 904
e71a4783
SH		 905 ret = -EFAULT;
906 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 907 break;
e71a4783
SH		 908
909 ret = sk_attach_filter(&fprog, sk);
910 }
911 break;
912
89aa0758
AS		 913 case SO_ATTACH_BPF:
914 ret = -EINVAL;
915 if (optlen == sizeof(u32)) {
916 u32 ufd;
917
918 ret = -EFAULT;
919 if (copy_from_user(&ufd, optval, sizeof(ufd)))
920 break;
921
922 ret = sk_attach_bpf(ufd, sk);
923 }
924 break;
925
e71a4783 926 case SO_DETACH_FILTER:
55b33325 927 ret = sk_detach_filter(sk);
e71a4783 928 break;
1da177e4 929
d59577b6
VB		 930 case SO_LOCK_FILTER:
931 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
932 ret = -EPERM;
933 else
934 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
935 break;
936
e71a4783
SH		 937 case SO_PASSSEC:
938 if (valbool)
939 set_bit(SOCK_PASSSEC, &sock->flags);
940 else
941 clear_bit(SOCK_PASSSEC, &sock->flags);
942 break;
4a19ec58 943 case SO_MARK:
5e1fccc0 944 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 945 ret = -EPERM;
2a91525c 946 else
4a19ec58 947 sk->sk_mark = val;
4a19ec58 948 break;
877ce7c1 949
3b885787 950 case SO_RXQ_OVFL:
8083f0fc 951 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 952 break;
6e3e939f
JB		 953
954 case SO_WIFI_STATUS:
955 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
956 break;
957
ef64a54f
PE		 958 case SO_PEEK_OFF:
959 if (sock->ops->set_peek_off)
12663bfc 960 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 961 else
962 ret = -EOPNOTSUPP;
963 break;
3bdc0eba
BG		 964
965 case SO_NOFCS:
966 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
967 break;
968
7d4c04fc
KJ		 969 case SO_SELECT_ERR_QUEUE:
970 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
971 break;
972
e0d1095a 973#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 974 case SO_BUSY_POLL:
dafcc438
ET		 975 /* allow unprivileged users to decrease the value */
976 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
977 ret = -EPERM;
978 else {
979 if (val < 0)
980 ret = -EINVAL;
981 else
982 sk->sk_ll_usec = val;
983 }
984 break;
985#endif
62748f32
ED		 986
987 case SO_MAX_PACING_RATE:
988 sk->sk_max_pacing_rate = val;
989 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
990 sk->sk_max_pacing_rate);
991 break;
992
e71a4783
SH		 993 default:
994 ret = -ENOPROTOOPT;
995 break;
4ec93edb 996 }
1da177e4
LT		 997 release_sock(sk);
998 return ret;
999}
2a91525c 1000EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 1001
1002
8f09898b 1003static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1004 struct ucred *ucred)
3f551f94
EB		 1005{
1006 ucred->pid = pid_vnr(pid);
1007 ucred->uid = ucred->gid = -1;
1008 if (cred) {
1009 struct user_namespace *current_ns = current_user_ns();
1010
b2e4f544
EB		 1011 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1012 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 1013 }
1014}
1015
1da177e4
LT		 1016int sock_getsockopt(struct socket *sock, int level, int optname,
1017 char __user *optval, int __user *optlen)
1018{
1019 struct sock *sk = sock->sk;
4ec93edb 1020
e71a4783 1021 union {
4ec93edb
YH		 1022 int val;
1023 struct linger ling;
1da177e4
LT		 1024 struct timeval tm;
1025 } v;
4ec93edb 1026
4d0392be 1027 int lv = sizeof(int);
1da177e4 1028 int len;
4ec93edb 1029
e71a4783 1030 if (get_user(len, optlen))
4ec93edb 1031 return -EFAULT;
e71a4783 1032 if (len < 0)
1da177e4 1033 return -EINVAL;
4ec93edb 1034
50fee1de 1035 memset(&v, 0, sizeof(v));
df0bca04 1036
2a91525c 1037 switch (optname) {
e71a4783
SH		 1038 case SO_DEBUG:
1039 v.val = sock_flag(sk, SOCK_DBG);
1040 break;
1041
1042 case SO_DONTROUTE:
1043 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1044 break;
1045
1046 case SO_BROADCAST:
1b23a5df 1047 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1048 break;
1049
1050 case SO_SNDBUF:
1051 v.val = sk->sk_sndbuf;
1052 break;
1053
1054 case SO_RCVBUF:
1055 v.val = sk->sk_rcvbuf;
1056 break;
1057
1058 case SO_REUSEADDR:
1059 v.val = sk->sk_reuse;
1060 break;
1061
055dc21a
TH		 1062 case SO_REUSEPORT:
1063 v.val = sk->sk_reuseport;
1064 break;
1065
e71a4783 1066 case SO_KEEPALIVE:
1b23a5df 1067 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1068 break;
1069
1070 case SO_TYPE:
1071 v.val = sk->sk_type;
1072 break;
1073
49c794e9
JE		 1074 case SO_PROTOCOL:
1075 v.val = sk->sk_protocol;
1076 break;
1077
0d6038ee
JE		 1078 case SO_DOMAIN:
1079 v.val = sk->sk_family;
1080 break;
1081
e71a4783
SH		 1082 case SO_ERROR:
1083 v.val = -sock_error(sk);
2a91525c 1084 if (v.val == 0)
e71a4783
SH		 1085 v.val = xchg(&sk->sk_err_soft, 0);
1086 break;
1087
1088 case SO_OOBINLINE:
1b23a5df 1089 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1090 break;
1091
1092 case SO_NO_CHECK:
28448b80 1093 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1094 break;
1095
1096 case SO_PRIORITY:
1097 v.val = sk->sk_priority;
1098 break;
1099
1100 case SO_LINGER:
1101 lv = sizeof(v.ling);
1b23a5df 1102 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1103 v.ling.l_linger = sk->sk_lingertime / HZ;
1104 break;
1105
1106 case SO_BSDCOMPAT:
1107 sock_warn_obsolete_bsdism("getsockopt");
1108 break;
1109
1110 case SO_TIMESTAMP:
92f37fd2
ED		 1111 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1112 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1113 break;
1114
1115 case SO_TIMESTAMPNS:
1116 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1117 break;
1118
20d49473 1119 case SO_TIMESTAMPING:
b9f40e21 1120 v.val = sk->sk_tsflags;
20d49473
PO		 1121 break;
1122
e71a4783 1123 case SO_RCVTIMEO:
2a91525c 1124 lv = sizeof(struct timeval);
e71a4783
SH		 1125 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1126 v.tm.tv_sec = 0;
1127 v.tm.tv_usec = 0;
1128 } else {
1129 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1130 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1131 }
1132 break;
1133
1134 case SO_SNDTIMEO:
2a91525c 1135 lv = sizeof(struct timeval);
e71a4783
SH		 1136 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1137 v.tm.tv_sec = 0;
1138 v.tm.tv_usec = 0;
1139 } else {
1140 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1141 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1142 }
1143 break;
1da177e4 1144
e71a4783
SH		 1145 case SO_RCVLOWAT:
1146 v.val = sk->sk_rcvlowat;
1147 break;
1da177e4 1148
e71a4783 1149 case SO_SNDLOWAT:
2a91525c 1150 v.val = 1;
e71a4783 1151 break;
1da177e4 1152
e71a4783 1153 case SO_PASSCRED:
82981930 1154 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1155 break;
1da177e4 1156
e71a4783 1157 case SO_PEERCRED:
109f6e39
EB		 1158 {
1159 struct ucred peercred;
1160 if (len > sizeof(peercred))
1161 len = sizeof(peercred);
1162 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1163 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1164 return -EFAULT;
1165 goto lenout;
109f6e39 1166 }
1da177e4 1167
e71a4783
SH		 1168 case SO_PEERNAME:
1169 {
1170 char address[128];
1171
1172 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1173 return -ENOTCONN;
1174 if (lv < len)
1175 return -EINVAL;
1176 if (copy_to_user(optval, address, len))
1177 return -EFAULT;
1178 goto lenout;
1179 }
1da177e4 1180
e71a4783
SH		 1181 /* Dubious BSD thing... Probably nobody even uses it, but
1182 * the UNIX standard wants it for whatever reason... -DaveM
1183 */
1184 case SO_ACCEPTCONN:
1185 v.val = sk->sk_state == TCP_LISTEN;
1186 break;
1da177e4 1187
e71a4783 1188 case SO_PASSSEC:
82981930 1189 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1190 break;
877ce7c1 1191
e71a4783
SH		 1192 case SO_PEERSEC:
1193 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1194
4a19ec58
LAT		 1195 case SO_MARK:
1196 v.val = sk->sk_mark;
1197 break;
1198
3b885787 1199 case SO_RXQ_OVFL:
1b23a5df 1200 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1201 break;
1202
6e3e939f 1203 case SO_WIFI_STATUS:
1b23a5df 1204 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1205 break;
1206
ef64a54f
PE		 1207 case SO_PEEK_OFF:
1208 if (!sock->ops->set_peek_off)
1209 return -EOPNOTSUPP;
1210
1211 v.val = sk->sk_peek_off;
1212 break;
bc2f7996 1213 case SO_NOFCS:
1b23a5df 1214 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1215 break;
c91f6df2 1216
f7b86bfe 1217 case SO_BINDTODEVICE:
c91f6df2
BH		 1218 return sock_getbindtodevice(sk, optval, optlen, len);
1219
a8fc9277
PE		 1220 case SO_GET_FILTER:
1221 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1222 if (len < 0)
1223 return len;
1224
1225 goto lenout;
c91f6df2 1226
d59577b6
VB		 1227 case SO_LOCK_FILTER:
1228 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1229 break;
1230
ea02f941
MS		 1231 case SO_BPF_EXTENSIONS:
1232 v.val = bpf_tell_extensions();
1233 break;
1234
7d4c04fc
KJ		 1235 case SO_SELECT_ERR_QUEUE:
1236 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1237 break;
1238
e0d1095a 1239#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1240 case SO_BUSY_POLL:
dafcc438
ET		 1241 v.val = sk->sk_ll_usec;
1242 break;
1243#endif
1244
62748f32
ED		 1245 case SO_MAX_PACING_RATE:
1246 v.val = sk->sk_max_pacing_rate;
1247 break;
1248
2c8c56e1
ED		 1249 case SO_INCOMING_CPU:
1250 v.val = sk->sk_incoming_cpu;
1251 break;
1252
e71a4783 1253 default:
443b5991
YH		 1254 /* We implement the SO_SNDLOWAT etc to not be settable
1255 * (1003.1g 7).
1256 */
e71a4783 1257 return -ENOPROTOOPT;
1da177e4 1258 }
e71a4783 1259
1da177e4
LT		 1260 if (len > lv)
1261 len = lv;
1262 if (copy_to_user(optval, &v, len))
1263 return -EFAULT;
1264lenout:
4ec93edb
YH		 1265 if (put_user(len, optlen))
1266 return -EFAULT;
1267 return 0;
1da177e4
LT		 1268}
1269
a5b5bb9a
IM		 1270/*
1271 * Initialize an sk_lock.
1272 *
1273 * (We also register the sk_lock with the lock validator.)
1274 */
b6f99a21 1275static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1276{
ed07536e
PZ		 1277 sock_lock_init_class_and_name(sk,
1278 af_family_slock_key_strings[sk->sk_family],
1279 af_family_slock_keys + sk->sk_family,
1280 af_family_key_strings[sk->sk_family],
1281 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1282}
1283
4dc6dc71
ED		 1284/*
1285 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1286 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1287 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1288 */
f1a6c4da
PE		 1289static void sock_copy(struct sock *nsk, const struct sock *osk)
1290{
1291#ifdef CONFIG_SECURITY_NETWORK
1292 void *sptr = nsk->sk_security;
1293#endif
68835aba
ED		 1294 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1295
1296 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1297 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1298
f1a6c4da
PE		 1299#ifdef CONFIG_SECURITY_NETWORK
1300 nsk->sk_security = sptr;
1301 security_sk_clone(osk, nsk);
1302#endif
1303}
1304
fcbdf09d
OP		 1305void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1306{
1307 unsigned long nulls1, nulls2;
1308
1309 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1310 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1311 if (nulls1 > nulls2)
1312 swap(nulls1, nulls2);
1313
1314 if (nulls1 != 0)
1315 memset((char *)sk, 0, nulls1);
1316 memset((char *)sk + nulls1 + sizeof(void *), 0,
1317 nulls2 - nulls1 - sizeof(void *));
1318 memset((char *)sk + nulls2 + sizeof(void *), 0,
1319 size - nulls2 - sizeof(void *));
1320}
1321EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1322
2e4afe7b
PE		 1323static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1324 int family)
c308c1b2
PE		 1325{
1326 struct sock *sk;
1327 struct kmem_cache *slab;
1328
1329 slab = prot->slab;
e912b114
ED		 1330 if (slab != NULL) {
1331 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1332 if (!sk)
1333 return sk;
1334 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1335 if (prot->clear_sk)
1336 prot->clear_sk(sk, prot->obj_size);
1337 else
1338 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1339 }
fcbdf09d 1340 } else
c308c1b2
PE		 1341 sk = kmalloc(prot->obj_size, priority);
1342
2e4afe7b 1343 if (sk != NULL) {
a98b65a3
VN		 1344 kmemcheck_annotate_bitfield(sk, flags);
1345
2e4afe7b
PE		 1346 if (security_sk_alloc(sk, family, priority))
1347 goto out_free;
1348
1349 if (!try_module_get(prot->owner))
1350 goto out_free_sec;
e022f0b4 1351 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1352 }
1353
c308c1b2 1354 return sk;
2e4afe7b
PE		 1355
1356out_free_sec:
1357 security_sk_free(sk);
1358out_free:
1359 if (slab != NULL)
1360 kmem_cache_free(slab, sk);
1361 else
1362 kfree(sk);
1363 return NULL;
c308c1b2
PE		 1364}
1365
1366static void sk_prot_free(struct proto *prot, struct sock *sk)
1367{
1368 struct kmem_cache *slab;
2e4afe7b 1369 struct module *owner;
c308c1b2 1370
2e4afe7b 1371 owner = prot->owner;
c308c1b2 1372 slab = prot->slab;
2e4afe7b
PE		 1373
1374 security_sk_free(sk);
c308c1b2
PE		 1375 if (slab != NULL)
1376 kmem_cache_free(slab, sk);
1377 else
1378 kfree(sk);
2e4afe7b 1379 module_put(owner);
c308c1b2
PE		 1380}
1381
86f8515f 1382#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
6ffd4641 1383void sock_update_netprioidx(struct sock *sk)
5bc1421e 1384{
5bc1421e
NH		 1385 if (in_interrupt())
1386 return;
2b73bc65 1387
6ffd4641 1388 sk->sk_cgrp_prioidx = task_netprioidx(current);
5bc1421e
NH		 1389}
1390EXPORT_SYMBOL_GPL(sock_update_netprioidx);
f8451725
HX		 1391#endif
1392
1da177e4
LT		 1393/**
1394 * sk_alloc - All socket objects are allocated here
c4ea43c5 1395 * @net: the applicable net namespace
4dc3b16b
PP		 1396 * @family: protocol family
1397 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1398 * @prot: struct proto associated with this new sock instance
1da177e4 1399 */
1b8d7ae4 1400struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1401 struct proto *prot)
1da177e4 1402{
c308c1b2 1403 struct sock *sk;
1da177e4 1404
154adbc8 1405 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1406 if (sk) {
154adbc8
PE		 1407 sk->sk_family = family;
1408 /*
1409 * See comment in struct sock definition to understand
1410 * why we need sk_prot_creator -acme
1411 */
1412 sk->sk_prot = sk->sk_prot_creator = prot;
1413 sock_lock_init(sk);
3b1e0a65 1414 sock_net_set(sk, get_net(net));
d66ee058 1415 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1416
211d2f97 1417 sock_update_classid(sk);
6ffd4641 1418 sock_update_netprioidx(sk);
1da177e4 1419 }
a79af59e 1420
2e4afe7b 1421 return sk;
1da177e4 1422}
2a91525c 1423EXPORT_SYMBOL(sk_alloc);
1da177e4 1424
2b85a34e 1425static void __sk_free(struct sock *sk)
1da177e4
LT		 1426{
1427 struct sk_filter *filter;
1da177e4
LT		 1428
1429 if (sk->sk_destruct)
1430 sk->sk_destruct(sk);
1431
a898def2
PM		 1432 filter = rcu_dereference_check(sk->sk_filter,
1433 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1434 if (filter) {
309dd5fc 1435 sk_filter_uncharge(sk, filter);
a9b3cd7f 1436 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1437 }
1438
08e29af3 1439 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1440
1441 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1442 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1443 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1444
109f6e39
EB		 1445 if (sk->sk_peer_cred)
1446 put_cred(sk->sk_peer_cred);
1447 put_pid(sk->sk_peer_pid);
3b1e0a65 1448 put_net(sock_net(sk));
c308c1b2 1449 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1450}
2b85a34e
ED		 1451
1452void sk_free(struct sock *sk)
1453{
1454 /*
25985edc 1455 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1456 * some packets are still in some tx queue.
1457 * If not null, sock_wfree() will call __sk_free(sk) later
1458 */
1459 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1460 __sk_free(sk);
1461}
2a91525c 1462EXPORT_SYMBOL(sk_free);
1da177e4 1463
edf02087 1464/*
25985edc
LDM		 1465 * Last sock_put should drop reference to sk->sk_net. It has already
1466 * been dropped in sk_change_net. Taking reference to stopping namespace
edf02087 1467 * is not an option.
25985edc 1468 * Take reference to a socket to remove it from hash _alive_ and after that
edf02087
DL		 1469 * destroy it in the context of init_net.
1470 */
1471void sk_release_kernel(struct sock *sk)
1472{
1473 if (sk == NULL || sk->sk_socket == NULL)
1474 return;
1475
1476 sock_hold(sk);
3b1e0a65 1477 sock_net_set(sk, get_net(&init_net));
c243d7e2 1478 sock_release(sk->sk_socket);
edf02087
DL		 1479 sock_put(sk);
1480}
45af1754 1481EXPORT_SYMBOL(sk_release_kernel);
edf02087 1482
475f1b52
SR		 1483static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1484{
1485 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1486 sock_update_memcg(newsk);
1487}
1488
e56c57d0
ED		 1489/**
1490 * sk_clone_lock - clone a socket, and lock its clone
1491 * @sk: the socket to clone
1492 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1493 *
1494 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1495 */
1496struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1497{
8fd1d178 1498 struct sock *newsk;
278571ba 1499 bool is_charged = true;
87d11ceb 1500
8fd1d178 1501 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1502 if (newsk != NULL) {
1503 struct sk_filter *filter;
1504
892c141e 1505 sock_copy(newsk, sk);
87d11ceb
ACM		 1506
1507 /* SANITY */
3b1e0a65 1508 get_net(sock_net(newsk));
87d11ceb
ACM		 1509 sk_node_init(&newsk->sk_node);
1510 sock_lock_init(newsk);
1511 bh_lock_sock(newsk);
fa438ccf 1512 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1513 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1514
1515 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1516 /*
1517 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1518 */
1519 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1520 atomic_set(&newsk->sk_omem_alloc, 0);
1521 skb_queue_head_init(&newsk->sk_receive_queue);
1522 skb_queue_head_init(&newsk->sk_write_queue);
1523
b6c6712a 1524 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1525 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1526 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1527 af_callback_keys + newsk->sk_family,
1528 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1529
1530 newsk->sk_dst_cache = NULL;
1531 newsk->sk_wmem_queued = 0;
1532 newsk->sk_forward_alloc = 0;
1533 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1534 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1535
1536 sock_reset_flag(newsk, SOCK_DONE);
1537 skb_queue_head_init(&newsk->sk_error_queue);
1538
0d7da9dd 1539 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb 1540 if (filter != NULL)
278571ba
AS		 1541 /* though it's an empty new sock, the charging may fail
1542 * if sysctl_optmem_max was changed between creation of
1543 * original socket and cloning
1544 */
1545 is_charged = sk_filter_charge(newsk, filter);
87d11ceb 1546
278571ba 1547 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk))) {
87d11ceb
ACM		 1548 /* It is still raw copy of parent, so invalidate
1549 * destructor and make plain sk_free() */
1550 newsk->sk_destruct = NULL;
b0691c8e 1551 bh_unlock_sock(newsk);
87d11ceb
ACM		 1552 sk_free(newsk);
1553 newsk = NULL;
1554 goto out;
1555 }
1556
1557 newsk->sk_err = 0;
1558 newsk->sk_priority = 0;
2c8c56e1 1559 newsk->sk_incoming_cpu = raw_smp_processor_id();
33cf7c90 1560 atomic64_set(&newsk->sk_cookie, 0);
4dc6dc71
ED		 1561 /*
1562 * Before updating sk_refcnt, we must commit prior changes to memory
1563 * (Documentation/RCU/rculist_nulls.txt for details)
1564 */
1565 smp_wmb();
87d11ceb
ACM		 1566 atomic_set(&newsk->sk_refcnt, 2);
1567
1568 /*
1569 * Increment the counter in the same struct proto as the master
1570 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1571 * is the same as sk->sk_prot->socks, as this field was copied
1572 * with memcpy).
1573 *
1574 * This _changes_ the previous behaviour, where
1575 * tcp_create_openreq_child always was incrementing the
1576 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1577 * to be taken into account in all callers. -acme
1578 */
1579 sk_refcnt_debug_inc(newsk);
972692e0 1580 sk_set_socket(newsk, NULL);
43815482 1581 newsk->sk_wq = NULL;
87d11ceb 1582
f3f511e1
GC		 1583 sk_update_clone(sk, newsk);
1584
87d11ceb 1585 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1586 sk_sockets_allocated_inc(newsk);
704da560 1587
08e29af3 1588 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1589 net_enable_timestamp();
87d11ceb
ACM		 1590 }
1591out:
1592 return newsk;
1593}
e56c57d0 1594EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1595
9958089a
AK		 1596void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1597{
1598 __sk_dst_set(sk, dst);
1599 sk->sk_route_caps = dst->dev->features;
1600 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1601 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1602 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1603 if (sk_can_gso(sk)) {
82cc1a7a 1604 if (dst->header_len) {
9958089a 1605 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1606 } else {
9958089a 1607 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1608 sk->sk_gso_max_size = dst->dev->gso_max_size;
1485348d 1609 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
82cc1a7a 1610 }
9958089a
AK		 1611 }
1612}
1613EXPORT_SYMBOL_GPL(sk_setup_caps);
1614
1da177e4
LT		 1615/*
1616 * Simple resource managers for sockets.
1617 */
1618
1619
4ec93edb
YH		 1620/*
1621 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1622 */
1623void sock_wfree(struct sk_buff *skb)
1624{
1625 struct sock *sk = skb->sk;
d99927f4 1626 unsigned int len = skb->truesize;
1da177e4 1627
d99927f4
ED		 1628 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1629 /*
1630 * Keep a reference on sk_wmem_alloc, this will be released
1631 * after sk_write_space() call
1632 */
1633 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1634 sk->sk_write_space(sk);
d99927f4
ED		 1635 len = 1;
1636 }
2b85a34e 1637 /*
d99927f4
ED		 1638 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1639 * could not do because of in-flight packets
2b85a34e 1640 */
d99927f4 1641 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1642 __sk_free(sk);
1da177e4 1643}
2a91525c 1644EXPORT_SYMBOL(sock_wfree);
1da177e4 1645
f2f872f9
ED		 1646void skb_orphan_partial(struct sk_buff *skb)
1647{
1648 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1649 * so we do not completely orphan skb, but transfert all
1650 * accounted bytes but one, to avoid unexpected reorders.
1651 */
1652 if (skb->destructor == sock_wfree
1653#ifdef CONFIG_INET
1654 || skb->destructor == tcp_wfree
1655#endif
1656 ) {
1657 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1658 skb->truesize = 1;
1659 } else {
1660 skb_orphan(skb);
1661 }
1662}
1663EXPORT_SYMBOL(skb_orphan_partial);
1664
4ec93edb
YH		 1665/*
1666 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1667 */
1668void sock_rfree(struct sk_buff *skb)
1669{
1670 struct sock *sk = skb->sk;
d361fd59 1671 unsigned int len = skb->truesize;
1da177e4 1672
d361fd59
ED		 1673 atomic_sub(len, &sk->sk_rmem_alloc);
1674 sk_mem_uncharge(sk, len);
1da177e4 1675}
2a91525c 1676EXPORT_SYMBOL(sock_rfree);
1da177e4 1677
7768eed8
OH		 1678/*
1679 * Buffer destructor for skbs that are not used directly in read or write
1680 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1681 */
62bccb8c
AD		 1682void sock_efree(struct sk_buff *skb)
1683{
1684 sock_put(skb->sk);
1685}
1686EXPORT_SYMBOL(sock_efree);
1687
976d0201 1688kuid_t sock_i_uid(struct sock *sk)
1da177e4 1689{
976d0201 1690 kuid_t uid;
1da177e4 1691
f064af1e 1692 read_lock_bh(&sk->sk_callback_lock);
976d0201 1693 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1694 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1695 return uid;
1696}
2a91525c 1697EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1698
1699unsigned long sock_i_ino(struct sock *sk)
1700{
1701 unsigned long ino;
1702
f064af1e 1703 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1704 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1705 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1706 return ino;
1707}
2a91525c 1708EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1709
1710/*
1711 * Allocate a skb from the socket's send buffer.
1712 */
86a76caf 1713struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1714 gfp_t priority)
1da177e4
LT		 1715{
1716 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1717 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1718 if (skb) {
1719 skb_set_owner_w(skb, sk);
1720 return skb;
1721 }
1722 }
1723 return NULL;
1724}
2a91525c 1725EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1726
4ec93edb 1727/*
1da177e4 1728 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1729 */
dd0fc66f 1730void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1731{
95c96174 1732 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1733 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1734 void *mem;
1735 /* First do the add, to avoid the race if kmalloc
4ec93edb 1736 * might sleep.
1da177e4
LT		 1737 */
1738 atomic_add(size, &sk->sk_omem_alloc);
1739 mem = kmalloc(size, priority);
1740 if (mem)
1741 return mem;
1742 atomic_sub(size, &sk->sk_omem_alloc);
1743 }
1744 return NULL;
1745}
2a91525c 1746EXPORT_SYMBOL(sock_kmalloc);
1da177e4 1747
79e88659
DB		 1748/* Free an option memory block. Note, we actually want the inline
1749 * here as this allows gcc to detect the nullify and fold away the
1750 * condition entirely.
1da177e4 1751 */
79e88659
DB		 1752static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1753 const bool nullify)
1da177e4 1754{
e53da5fb
DM		 1755 if (WARN_ON_ONCE(!mem))
1756 return;
79e88659
DB		 1757 if (nullify)
1758 kzfree(mem);
1759 else
1760 kfree(mem);
1da177e4
LT		 1761 atomic_sub(size, &sk->sk_omem_alloc);
1762}
79e88659
DB		 1763
1764void sock_kfree_s(struct sock *sk, void *mem, int size)
1765{
1766 __sock_kfree_s(sk, mem, size, false);
1767}
2a91525c 1768EXPORT_SYMBOL(sock_kfree_s);
1da177e4 1769
79e88659
DB		 1770void sock_kzfree_s(struct sock *sk, void *mem, int size)
1771{
1772 __sock_kfree_s(sk, mem, size, true);
1773}
1774EXPORT_SYMBOL(sock_kzfree_s);
1775
1da177e4
LT		 1776/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1777 I think, these locks should be removed for datagram sockets.
1778 */
2a91525c 1779static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1780{
1781 DEFINE_WAIT(wait);
1782
1783 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1784 for (;;) {
1785 if (!timeo)
1786 break;
1787 if (signal_pending(current))
1788 break;
1789 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1790 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1791 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1792 break;
1793 if (sk->sk_shutdown & SEND_SHUTDOWN)
1794 break;
1795 if (sk->sk_err)
1796 break;
1797 timeo = schedule_timeout(timeo);
1798 }
aa395145 1799 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1800 return timeo;
1801}
1802
1803
1804/*
1805 * Generic send/receive buffer handlers
1806 */
1807
4cc7f68d
HX		 1808struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1809 unsigned long data_len, int noblock,
28d64271 1810 int *errcode, int max_page_order)
1da177e4 1811{
2e4e4410 1812 struct sk_buff *skb;
1da177e4
LT		 1813 long timeo;
1814 int err;
1815
1da177e4 1816 timeo = sock_sndtimeo(sk, noblock);
2e4e4410 1817 for (;;) {
1da177e4
LT		 1818 err = sock_error(sk);
1819 if (err != 0)
1820 goto failure;
1821
1822 err = -EPIPE;
1823 if (sk->sk_shutdown & SEND_SHUTDOWN)
1824 goto failure;
1825
2e4e4410
ED		 1826 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
1827 break;
28d64271 1828
2e4e4410
ED		 1829 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1830 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1831 err = -EAGAIN;
1832 if (!timeo)
1da177e4 1833 goto failure;
2e4e4410
ED		 1834 if (signal_pending(current))
1835 goto interrupted;
1836 timeo = sock_wait_for_wmem(sk, timeo);
1da177e4 1837 }
2e4e4410
ED		 1838 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
1839 errcode, sk->sk_allocation);
1840 if (skb)
1841 skb_set_owner_w(skb, sk);
1da177e4
LT		 1842 return skb;
1843
1844interrupted:
1845 err = sock_intr_errno(timeo);
1846failure:
1847 *errcode = err;
1848 return NULL;
1849}
4cc7f68d 1850EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1851
4ec93edb 1852struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1853 int noblock, int *errcode)
1854{
28d64271 1855 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1856}
2a91525c 1857EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1858
5640f768
ED		 1859/* On 32bit arches, an skb frag is limited to 2^15 */
1860#define SKB_FRAG_PAGE_ORDER get_order(32768)
1861
400dfd3a
ED		 1862/**
1863 * skb_page_frag_refill - check that a page_frag contains enough room
1864 * @sz: minimum size of the fragment we want to get
1865 * @pfrag: pointer to page_frag
82d5e2b8 1866 * @gfp: priority for memory allocation
400dfd3a
ED		 1867 *
1868 * Note: While this allocator tries to use high order pages, there is
1869 * no guarantee that allocations succeed. Therefore, @sz MUST be
1870 * less or equal than PAGE_SIZE.
1871 */
d9b2938a 1872bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 1873{
5640f768
ED		 1874 if (pfrag->page) {
1875 if (atomic_read(&pfrag->page->_count) == 1) {
1876 pfrag->offset = 0;
1877 return true;
1878 }
400dfd3a 1879 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1880 return true;
1881 put_page(pfrag->page);
1882 }
1883
d9b2938a
ED		 1884 pfrag->offset = 0;
1885 if (SKB_FRAG_PAGE_ORDER) {
1886 pfrag->page = alloc_pages(gfp | __GFP_COMP |
1887 __GFP_NOWARN | __GFP_NORETRY,
1888 SKB_FRAG_PAGE_ORDER);
5640f768 1889 if (likely(pfrag->page)) {
d9b2938a 1890 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 1891 return true;
1892 }
d9b2938a
ED		 1893 }
1894 pfrag->page = alloc_page(gfp);
1895 if (likely(pfrag->page)) {
1896 pfrag->size = PAGE_SIZE;
1897 return true;
1898 }
400dfd3a
ED		 1899 return false;
1900}
1901EXPORT_SYMBOL(skb_page_frag_refill);
1902
1903bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1904{
1905 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1906 return true;
1907
5640f768
ED		 1908 sk_enter_memory_pressure(sk);
1909 sk_stream_moderate_sndbuf(sk);
1910 return false;
1911}
1912EXPORT_SYMBOL(sk_page_frag_refill);
1913
1da177e4 1914static void __lock_sock(struct sock *sk)
f39234d6
NK		 1915 __releases(&sk->sk_lock.slock)
1916 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1917{
1918 DEFINE_WAIT(wait);
1919
e71a4783 1920 for (;;) {
1da177e4
LT		 1921 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1922 TASK_UNINTERRUPTIBLE);
1923 spin_unlock_bh(&sk->sk_lock.slock);
1924 schedule();
1925 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1926 if (!sock_owned_by_user(sk))
1da177e4
LT		 1927 break;
1928 }
1929 finish_wait(&sk->sk_lock.wq, &wait);
1930}
1931
1932static void __release_sock(struct sock *sk)
f39234d6
NK		 1933 __releases(&sk->sk_lock.slock)
1934 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1935{
1936 struct sk_buff *skb = sk->sk_backlog.head;
1937
1938 do {
1939 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1940 bh_unlock_sock(sk);
1941
1942 do {
1943 struct sk_buff *next = skb->next;
1944
e4cbb02a 1945 prefetch(next);
7fee226a 1946 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1947 skb->next = NULL;
c57943a1 1948 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1949
1950 /*
1951 * We are in process context here with softirqs
1952 * disabled, use cond_resched_softirq() to preempt.
1953 * This is safe to do because we've taken the backlog
1954 * queue private:
1955 */
1956 cond_resched_softirq();
1957
1958 skb = next;
1959 } while (skb != NULL);
1960
1961 bh_lock_sock(sk);
e71a4783 1962 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1963
1964 /*
1965 * Doing the zeroing here guarantee we can not loop forever
1966 * while a wild producer attempts to flood us.
1967 */
1968 sk->sk_backlog.len = 0;
1da177e4
LT		 1969}
1970
1971/**
1972 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1973 * @sk: sock to wait on
1974 * @timeo: for how long
1da177e4
LT		 1975 *
1976 * Now socket state including sk->sk_err is changed only under lock,
1977 * hence we may omit checks after joining wait queue.
1978 * We check receive queue before schedule() only as optimization;
1979 * it is very likely that release_sock() added new data.
1980 */
1981int sk_wait_data(struct sock *sk, long *timeo)
1982{
1983 int rc;
1984 DEFINE_WAIT(wait);
1985
aa395145 1986 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1987 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1988 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1989 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1990 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1991 return rc;
1992}
1da177e4
LT		 1993EXPORT_SYMBOL(sk_wait_data);
1994
3ab224be
HA		 1995/**
1996 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1997 * @sk: socket
1998 * @size: memory size to allocate
1999 * @kind: allocation type
2000 *
2001 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2002 * rmem allocation. This function assumes that protocols which have
2003 * memory_pressure use sk_wmem_queued as write buffer accounting.
2004 */
2005int __sk_mem_schedule(struct sock *sk, int size, int kind)
2006{
2007 struct proto *prot = sk->sk_prot;
2008 int amt = sk_mem_pages(size);
8d987e5c 2009 long allocated;
e1aab161 2010 int parent_status = UNDER_LIMIT;
3ab224be
HA		 2011
2012 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 2013
e1aab161 2014 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 2015
2016 /* Under limit. */
e1aab161
GC		 2017 if (parent_status == UNDER_LIMIT &&
2018 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2019 sk_leave_memory_pressure(sk);
3ab224be
HA		 2020 return 1;
2021 }
2022
e1aab161
GC		 2023 /* Under pressure. (we or our parents) */
2024 if ((parent_status > SOFT_LIMIT) ||
2025 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2026 sk_enter_memory_pressure(sk);
3ab224be 2027
e1aab161
GC		 2028 /* Over hard limit (we or our parents) */
2029 if ((parent_status == OVER_LIMIT) ||
2030 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 2031 goto suppress_allocation;
2032
2033 /* guarantee minimum buffer size under pressure */
2034 if (kind == SK_MEM_RECV) {
2035 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2036 return 1;
180d8cd9 2037
3ab224be
HA		 2038 } else { /* SK_MEM_SEND */
2039 if (sk->sk_type == SOCK_STREAM) {
2040 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2041 return 1;
2042 } else if (atomic_read(&sk->sk_wmem_alloc) <
2043 prot->sysctl_wmem[0])
2044 return 1;
2045 }
2046
180d8cd9 2047 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2048 int alloc;
2049
180d8cd9 2050 if (!sk_under_memory_pressure(sk))
1748376b 2051 return 1;
180d8cd9
GC		 2052 alloc = sk_sockets_allocated_read_positive(sk);
2053 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2054 sk_mem_pages(sk->sk_wmem_queued +
2055 atomic_read(&sk->sk_rmem_alloc) +
2056 sk->sk_forward_alloc))
2057 return 1;
2058 }
2059
2060suppress_allocation:
2061
2062 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2063 sk_stream_moderate_sndbuf(sk);
2064
2065 /* Fail only if socket is _under_ its sndbuf.
2066 * In this case we cannot block, so that we have to fail.
2067 */
2068 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2069 return 1;
2070 }
2071
3847ce32
SM		 2072 trace_sock_exceed_buf_limit(sk, prot, allocated);
2073
3ab224be
HA		 2074 /* Alas. Undo changes. */
2075 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2076
0e90b31f 2077 sk_memory_allocated_sub(sk, amt);
180d8cd9 2078
3ab224be
HA		 2079 return 0;
2080}
3ab224be
HA		 2081EXPORT_SYMBOL(__sk_mem_schedule);
2082
2083/**
2084 * __sk_reclaim - reclaim memory_allocated
2085 * @sk: socket
2086 */
2087void __sk_mem_reclaim(struct sock *sk)
2088{
180d8cd9 2089 sk_memory_allocated_sub(sk,
0e90b31f 2090 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
3ab224be
HA		 2091 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
2092
180d8cd9
GC		 2093 if (sk_under_memory_pressure(sk) &&
2094 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2095 sk_leave_memory_pressure(sk);
3ab224be 2096}
3ab224be
HA		 2097EXPORT_SYMBOL(__sk_mem_reclaim);
2098
2099
1da177e4
LT		 2100/*
2101 * Set of default routines for initialising struct proto_ops when
2102 * the protocol does not support a particular function. In certain
2103 * cases where it makes no sense for a protocol to have a "do nothing"
2104 * function, some default processing is provided.
2105 */
2106
2107int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2108{
2109 return -EOPNOTSUPP;
2110}
2a91525c 2111EXPORT_SYMBOL(sock_no_bind);
1da177e4 2112
4ec93edb 2113int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2114 int len, int flags)
2115{
2116 return -EOPNOTSUPP;
2117}
2a91525c 2118EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2119
2120int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2121{
2122 return -EOPNOTSUPP;
2123}
2a91525c 2124EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2125
2126int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2127{
2128 return -EOPNOTSUPP;
2129}
2a91525c 2130EXPORT_SYMBOL(sock_no_accept);
1da177e4 2131
4ec93edb 2132int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2133 int *len, int peer)
2134{
2135 return -EOPNOTSUPP;
2136}
2a91525c 2137EXPORT_SYMBOL(sock_no_getname);
1da177e4 2138
2a91525c 2139unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2140{
2141 return 0;
2142}
2a91525c 2143EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2144
2145int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2146{
2147 return -EOPNOTSUPP;
2148}
2a91525c 2149EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2150
2151int sock_no_listen(struct socket *sock, int backlog)
2152{
2153 return -EOPNOTSUPP;
2154}
2a91525c 2155EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2156
2157int sock_no_shutdown(struct socket *sock, int how)
2158{
2159 return -EOPNOTSUPP;
2160}
2a91525c 2161EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2162
2163int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2164 char __user *optval, unsigned int optlen)
1da177e4
LT		 2165{
2166 return -EOPNOTSUPP;
2167}
2a91525c 2168EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2169
2170int sock_no_getsockopt(struct socket *sock, int level, int optname,
2171 char __user *optval, int __user *optlen)
2172{
2173 return -EOPNOTSUPP;
2174}
2a91525c 2175EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4 2176
1b784140 2177int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
1da177e4
LT		 2178{
2179 return -EOPNOTSUPP;
2180}
2a91525c 2181EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4 2182
1b784140
YX		 2183int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2184 int flags)
1da177e4
LT		 2185{
2186 return -EOPNOTSUPP;
2187}
2a91525c 2188EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2189
2190int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2191{
2192 /* Mirror missing mmap method error code */
2193 return -ENODEV;
2194}
2a91525c 2195EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2196
2197ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2198{
2199 ssize_t res;
2200 struct msghdr msg = {.msg_flags = flags};
2201 struct kvec iov;
2202 char *kaddr = kmap(page);
2203 iov.iov_base = kaddr + offset;
2204 iov.iov_len = size;
2205 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2206 kunmap(page);
2207 return res;
2208}
2a91525c 2209EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2210
2211/*
2212 * Default Socket Callbacks
2213 */
2214
2215static void sock_def_wakeup(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_all(&wq->wait);
2223 rcu_read_unlock();
1da177e4
LT		 2224}
2225
2226static void sock_def_error_report(struct sock *sk)
2227{
43815482
ED		 2228 struct socket_wq *wq;
2229
2230 rcu_read_lock();
2231 wq = rcu_dereference(sk->sk_wq);
2232 if (wq_has_sleeper(wq))
2233 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2234 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2235 rcu_read_unlock();
1da177e4
LT		 2236}
2237
676d2369 2238static void sock_def_readable(struct sock *sk)
1da177e4 2239{
43815482
ED		 2240 struct socket_wq *wq;
2241
2242 rcu_read_lock();
2243 wq = rcu_dereference(sk->sk_wq);
2244 if (wq_has_sleeper(wq))
2c6607c6 2245 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2246 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2247 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2248 rcu_read_unlock();
1da177e4
LT		 2249}
2250
2251static void sock_def_write_space(struct sock *sk)
2252{
43815482
ED		 2253 struct socket_wq *wq;
2254
2255 rcu_read_lock();
1da177e4
LT		 2256
2257 /* Do not wake up a writer until he can make "significant"
2258 * progress. --DaveM
2259 */
e71a4783 2260 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2261 wq = rcu_dereference(sk->sk_wq);
2262 if (wq_has_sleeper(wq))
2263 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2264 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2265
2266 /* Should agree with poll, otherwise some programs break */
2267 if (sock_writeable(sk))
8d8ad9d7 2268 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2269 }
2270
43815482 2271 rcu_read_unlock();
1da177e4
LT		 2272}
2273
2274static void sock_def_destruct(struct sock *sk)
2275{
a51482bd 2276 kfree(sk->sk_protinfo);
1da177e4
LT		 2277}
2278
2279void sk_send_sigurg(struct sock *sk)
2280{
2281 if (sk->sk_socket && sk->sk_socket->file)
2282 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2283 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2284}
2a91525c 2285EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2286
2287void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2288 unsigned long expires)
2289{
2290 if (!mod_timer(timer, expires))
2291 sock_hold(sk);
2292}
1da177e4
LT		 2293EXPORT_SYMBOL(sk_reset_timer);
2294
2295void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2296{
25cc4ae9 2297 if (del_timer(timer))
1da177e4
LT		 2298 __sock_put(sk);
2299}
1da177e4
LT		 2300EXPORT_SYMBOL(sk_stop_timer);
2301
2302void sock_init_data(struct socket *sock, struct sock *sk)
2303{
2304 skb_queue_head_init(&sk->sk_receive_queue);
2305 skb_queue_head_init(&sk->sk_write_queue);
2306 skb_queue_head_init(&sk->sk_error_queue);
2307
2308 sk->sk_send_head = NULL;
2309
2310 init_timer(&sk->sk_timer);
4ec93edb 2311
1da177e4
LT		 2312 sk->sk_allocation = GFP_KERNEL;
2313 sk->sk_rcvbuf = sysctl_rmem_default;
2314 sk->sk_sndbuf = sysctl_wmem_default;
2315 sk->sk_state = TCP_CLOSE;
972692e0 2316 sk_set_socket(sk, sock);
1da177e4
LT		 2317
2318 sock_set_flag(sk, SOCK_ZAPPED);
2319
e71a4783 2320 if (sock) {
1da177e4 2321 sk->sk_type = sock->type;
43815482 2322 sk->sk_wq = sock->wq;
1da177e4
LT		 2323 sock->sk = sk;
2324 } else
43815482 2325 sk->sk_wq = NULL;
1da177e4 2326
b6c6712a 2327 spin_lock_init(&sk->sk_dst_lock);
1da177e4 2328 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2329 lockdep_set_class_and_name(&sk->sk_callback_lock,
2330 af_callback_keys + sk->sk_family,
2331 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2332
2333 sk->sk_state_change = sock_def_wakeup;
2334 sk->sk_data_ready = sock_def_readable;
2335 sk->sk_write_space = sock_def_write_space;
2336 sk->sk_error_report = sock_def_error_report;
2337 sk->sk_destruct = sock_def_destruct;
2338
5640f768
ED		 2339 sk->sk_frag.page = NULL;
2340 sk->sk_frag.offset = 0;
ef64a54f 2341 sk->sk_peek_off = -1;
1da177e4 2342
109f6e39
EB		 2343 sk->sk_peer_pid = NULL;
2344 sk->sk_peer_cred = NULL;
1da177e4
LT		 2345 sk->sk_write_pending = 0;
2346 sk->sk_rcvlowat = 1;
2347 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2348 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2349
f37f0afb 2350 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2351
e0d1095a 2352#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2353 sk->sk_napi_id = 0;
64b0dc51 2354 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2355#endif
2356
62748f32 2357 sk->sk_max_pacing_rate = ~0U;
7eec4174 2358 sk->sk_pacing_rate = ~0U;
4dc6dc71
ED		 2359 /*
2360 * Before updating sk_refcnt, we must commit prior changes to memory
2361 * (Documentation/RCU/rculist_nulls.txt for details)
2362 */
2363 smp_wmb();
1da177e4 2364 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2365 atomic_set(&sk->sk_drops, 0);
1da177e4 2366}
2a91525c 2367EXPORT_SYMBOL(sock_init_data);
1da177e4 2368
b5606c2d 2369void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2370{
2371 might_sleep();
a5b5bb9a 2372 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2373 if (sk->sk_lock.owned)
1da177e4 2374 __lock_sock(sk);
d2e9117c 2375 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2376 spin_unlock(&sk->sk_lock.slock);
2377 /*
2378 * The sk_lock has mutex_lock() semantics here:
2379 */
fcc70d5f 2380 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2381 local_bh_enable();
1da177e4 2382}
fcc70d5f 2383EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2384
b5606c2d 2385void release_sock(struct sock *sk)
1da177e4 2386{
a5b5bb9a
IM		 2387 /*
2388 * The sk_lock has mutex_unlock() semantics:
2389 */
2390 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2391
2392 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2393 if (sk->sk_backlog.tail)
2394 __release_sock(sk);
46d3ceab 2395
c3f9b018
ED		 2396 /* Warning : release_cb() might need to release sk ownership,
2397 * ie call sock_release_ownership(sk) before us.
2398 */
46d3ceab
ED		 2399 if (sk->sk_prot->release_cb)
2400 sk->sk_prot->release_cb(sk);
2401
c3f9b018 2402 sock_release_ownership(sk);
a5b5bb9a
IM		 2403 if (waitqueue_active(&sk->sk_lock.wq))
2404 wake_up(&sk->sk_lock.wq);
2405 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2406}
2407EXPORT_SYMBOL(release_sock);
2408
8a74ad60
ED		 2409/**
2410 * lock_sock_fast - fast version of lock_sock
2411 * @sk: socket
2412 *
2413 * This version should be used for very small section, where process wont block
2414 * return false if fast path is taken
2415 * sk_lock.slock locked, owned = 0, BH disabled
2416 * return true if slow path is taken
2417 * sk_lock.slock unlocked, owned = 1, BH enabled
2418 */
2419bool lock_sock_fast(struct sock *sk)
2420{
2421 might_sleep();
2422 spin_lock_bh(&sk->sk_lock.slock);
2423
2424 if (!sk->sk_lock.owned)
2425 /*
2426 * Note : We must disable BH
2427 */
2428 return false;
2429
2430 __lock_sock(sk);
2431 sk->sk_lock.owned = 1;
2432 spin_unlock(&sk->sk_lock.slock);
2433 /*
2434 * The sk_lock has mutex_lock() semantics here:
2435 */
2436 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2437 local_bh_enable();
2438 return true;
2439}
2440EXPORT_SYMBOL(lock_sock_fast);
2441
1da177e4 2442int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2443{
b7aa0bf7 2444 struct timeval tv;
1da177e4 2445 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2446 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2447 tv = ktime_to_timeval(sk->sk_stamp);
2448 if (tv.tv_sec == -1)
1da177e4 2449 return -ENOENT;
b7aa0bf7
ED		 2450 if (tv.tv_sec == 0) {
2451 sk->sk_stamp = ktime_get_real();
2452 tv = ktime_to_timeval(sk->sk_stamp);
2453 }
2454 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2455}
1da177e4
LT		 2456EXPORT_SYMBOL(sock_get_timestamp);
2457
ae40eb1e
ED		 2458int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2459{
2460 struct timespec ts;
2461 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2462 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2463 ts = ktime_to_timespec(sk->sk_stamp);
2464 if (ts.tv_sec == -1)
2465 return -ENOENT;
2466 if (ts.tv_sec == 0) {
2467 sk->sk_stamp = ktime_get_real();
2468 ts = ktime_to_timespec(sk->sk_stamp);
2469 }
2470 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2471}
2472EXPORT_SYMBOL(sock_get_timestampns);
2473
20d49473 2474void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2475{
20d49473 2476 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2477 unsigned long previous_flags = sk->sk_flags;
2478
20d49473
PO		 2479 sock_set_flag(sk, flag);
2480 /*
2481 * we just set one of the two flags which require net
2482 * time stamping, but time stamping might have been on
2483 * already because of the other one
2484 */
08e29af3 2485 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2486 net_enable_timestamp();
1da177e4
LT		 2487 }
2488}
1da177e4 2489
cb820f8e
RC		 2490int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2491 int level, int type)
2492{
2493 struct sock_exterr_skb *serr;
364a9e93 2494 struct sk_buff *skb;
cb820f8e
RC		 2495 int copied, err;
2496
2497 err = -EAGAIN;
364a9e93 2498 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 2499 if (skb == NULL)
2500 goto out;
2501
2502 copied = skb->len;
2503 if (copied > len) {
2504 msg->msg_flags |= MSG_TRUNC;
2505 copied = len;
2506 }
51f3d02b 2507 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 2508 if (err)
2509 goto out_free_skb;
2510
2511 sock_recv_timestamp(msg, sk, skb);
2512
2513 serr = SKB_EXT_ERR(skb);
2514 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2515
2516 msg->msg_flags |= MSG_ERRQUEUE;
2517 err = copied;
2518
cb820f8e
RC		 2519out_free_skb:
2520 kfree_skb(skb);
2521out:
2522 return err;
2523}
2524EXPORT_SYMBOL(sock_recv_errqueue);
2525
1da177e4
LT		 2526/*
2527 * Get a socket option on an socket.
2528 *
2529 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2530 * asynchronous errors should be reported by getsockopt. We assume
2531 * this means if you specify SO_ERROR (otherwise whats the point of it).
2532 */
2533int sock_common_getsockopt(struct socket *sock, int level, int optname,
2534 char __user *optval, int __user *optlen)
2535{
2536 struct sock *sk = sock->sk;
2537
2538 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2539}
1da177e4
LT		 2540EXPORT_SYMBOL(sock_common_getsockopt);
2541
3fdadf7d 2542#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2543int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2544 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2545{
2546 struct sock *sk = sock->sk;
2547
1e51f951 2548 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2549 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2550 optval, optlen);
3fdadf7d
DM		 2551 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2552}
2553EXPORT_SYMBOL(compat_sock_common_getsockopt);
2554#endif
2555
1b784140
YX		 2556int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2557 int flags)
1da177e4
LT		 2558{
2559 struct sock *sk = sock->sk;
2560 int addr_len = 0;
2561 int err;
2562
1b784140 2563 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
1da177e4
LT		 2564 flags & ~MSG_DONTWAIT, &addr_len);
2565 if (err >= 0)
2566 msg->msg_namelen = addr_len;
2567 return err;
2568}
1da177e4
LT		 2569EXPORT_SYMBOL(sock_common_recvmsg);
2570
2571/*
2572 * Set socket options on an inet socket.
2573 */
2574int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2575 char __user *optval, unsigned int optlen)
1da177e4
LT		 2576{
2577 struct sock *sk = sock->sk;
2578
2579 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2580}
1da177e4
LT		 2581EXPORT_SYMBOL(sock_common_setsockopt);
2582
3fdadf7d 2583#ifdef CONFIG_COMPAT
543d9cfe 2584int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2585 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2586{
2587 struct sock *sk = sock->sk;
2588
543d9cfe
ACM		 2589 if (sk->sk_prot->compat_setsockopt != NULL)
2590 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2591 optval, optlen);
3fdadf7d
DM		 2592 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2593}
2594EXPORT_SYMBOL(compat_sock_common_setsockopt);
2595#endif
2596
1da177e4
LT		 2597void sk_common_release(struct sock *sk)
2598{
2599 if (sk->sk_prot->destroy)
2600 sk->sk_prot->destroy(sk);
2601
2602 /*
2603 * Observation: when sock_common_release is called, processes have
2604 * no access to socket. But net still has.
2605 * Step one, detach it from networking:
2606 *
2607 * A. Remove from hash tables.
2608 */
2609
2610 sk->sk_prot->unhash(sk);
2611
2612 /*
2613 * In this point socket cannot receive new packets, but it is possible
2614 * that some packets are in flight because some CPU runs receiver and
2615 * did hash table lookup before we unhashed socket. They will achieve
2616 * receive queue and will be purged by socket destructor.
2617 *
2618 * Also we still have packets pending on receive queue and probably,
2619 * our own packets waiting in device queues. sock_destroy will drain
2620 * receive queue, but transmitted packets will delay socket destruction
2621 * until the last reference will be released.
2622 */
2623
2624 sock_orphan(sk);
2625
2626 xfrm_sk_free_policy(sk);
2627
e6848976 2628 sk_refcnt_debug_release(sk);
5640f768
ED		 2629
2630 if (sk->sk_frag.page) {
2631 put_page(sk->sk_frag.page);
2632 sk->sk_frag.page = NULL;
2633 }
2634
1da177e4
LT		 2635 sock_put(sk);
2636}
1da177e4
LT		 2637EXPORT_SYMBOL(sk_common_release);
2638
13ff3d6f
PE		 2639#ifdef CONFIG_PROC_FS
2640#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2641struct prot_inuse {
2642 int val[PROTO_INUSE_NR];
2643};
13ff3d6f
PE		 2644
2645static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2646
2647#ifdef CONFIG_NET_NS
2648void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2649{
d6d9ca0f 2650 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2651}
2652EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2653
2654int sock_prot_inuse_get(struct net *net, struct proto *prot)
2655{
2656 int cpu, idx = prot->inuse_idx;
2657 int res = 0;
2658
2659 for_each_possible_cpu(cpu)
2660 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2661
2662 return res >= 0 ? res : 0;
2663}
2664EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2665
2c8c1e72 2666static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2667{
2668 net->core.inuse = alloc_percpu(struct prot_inuse);
2669 return net->core.inuse ? 0 : -ENOMEM;
2670}
2671
2c8c1e72 2672static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2673{
2674 free_percpu(net->core.inuse);
2675}
2676
2677static struct pernet_operations net_inuse_ops = {
2678 .init = sock_inuse_init_net,
2679 .exit = sock_inuse_exit_net,
2680};
2681
2682static __init int net_inuse_init(void)
2683{
2684 if (register_pernet_subsys(&net_inuse_ops))
2685 panic("Cannot initialize net inuse counters");
2686
2687 return 0;
2688}
2689
2690core_initcall(net_inuse_init);
2691#else
1338d466
PE		 2692static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2693
c29a0bc4 2694void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2695{
d6d9ca0f 2696 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2697}
2698EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2699
c29a0bc4 2700int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2701{
2702 int cpu, idx = prot->inuse_idx;
2703 int res = 0;
2704
2705 for_each_possible_cpu(cpu)
2706 res += per_cpu(prot_inuse, cpu).val[idx];
2707
2708 return res >= 0 ? res : 0;
2709}
2710EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2711#endif
13ff3d6f
PE		 2712
2713static void assign_proto_idx(struct proto *prot)
2714{
2715 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2716
2717 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2718 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2719 return;
2720 }
2721
2722 set_bit(prot->inuse_idx, proto_inuse_idx);
2723}
2724
2725static void release_proto_idx(struct proto *prot)
2726{
2727 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2728 clear_bit(prot->inuse_idx, proto_inuse_idx);
2729}
2730#else
2731static inline void assign_proto_idx(struct proto *prot)
2732{
2733}
2734
2735static inline void release_proto_idx(struct proto *prot)
2736{
2737}
2738#endif
2739
0159dfd3
ED		 2740static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
2741{
2742 if (!rsk_prot)
2743 return;
2744 kfree(rsk_prot->slab_name);
2745 rsk_prot->slab_name = NULL;
2746 if (rsk_prot->slab) {
2747 kmem_cache_destroy(rsk_prot->slab);
2748 rsk_prot->slab = NULL;
2749 }
2750}
2751
2752static int req_prot_init(const struct proto *prot)
2753{
2754 struct request_sock_ops *rsk_prot = prot->rsk_prot;
2755
2756 if (!rsk_prot)
2757 return 0;
2758
2759 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
2760 prot->name);
2761 if (!rsk_prot->slab_name)
2762 return -ENOMEM;
2763
2764 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
2765 rsk_prot->obj_size, 0,
fa76ce73 2766 0, NULL);
0159dfd3
ED		 2767
2768 if (!rsk_prot->slab) {
2769 pr_crit("%s: Can't create request sock SLAB cache!\n",
2770 prot->name);
2771 return -ENOMEM;
2772 }
2773 return 0;
2774}
2775
b733c007
PE		 2776int proto_register(struct proto *prot, int alloc_slab)
2777{
1da177e4
LT		 2778 if (alloc_slab) {
2779 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2780 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2781 NULL);
1da177e4
LT		 2782
2783 if (prot->slab == NULL) {
e005d193
JP		 2784 pr_crit("%s: Can't create sock SLAB cache!\n",
2785 prot->name);
60e7663d 2786 goto out;
1da177e4 2787 }
2e6599cb 2788
0159dfd3
ED		 2789 if (req_prot_init(prot))
2790 goto out_free_request_sock_slab;
8feaf0c0 2791
6d6ee43e 2792 if (prot->twsk_prot != NULL) {
faf23422 2793 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2794
7e56b5d6 2795 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2796 goto out_free_request_sock_slab;
2797
6d6ee43e 2798 prot->twsk_prot->twsk_slab =
7e56b5d6 2799 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2800 prot->twsk_prot->twsk_obj_size,
3ab5aee7 2801 0,
52db70dc 2802 prot->slab_flags,
20c2df83 2803 NULL);
6d6ee43e 2804 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2805 goto out_free_timewait_sock_slab_name;
2806 }
1da177e4
LT		 2807 }
2808
36b77a52 2809 mutex_lock(&proto_list_mutex);
1da177e4 2810 list_add(&prot->node, &proto_list);
13ff3d6f 2811 assign_proto_idx(prot);
36b77a52 2812 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2813 return 0;
2814
8feaf0c0 2815out_free_timewait_sock_slab_name:
7e56b5d6 2816 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0 2817out_free_request_sock_slab:
0159dfd3
ED		 2818 req_prot_cleanup(prot->rsk_prot);
2819
2e6599cb
ACM		 2820 kmem_cache_destroy(prot->slab);
2821 prot->slab = NULL;
b733c007
PE		 2822out:
2823 return -ENOBUFS;
1da177e4 2824}
1da177e4
LT		 2825EXPORT_SYMBOL(proto_register);
2826
2827void proto_unregister(struct proto *prot)
2828{
36b77a52 2829 mutex_lock(&proto_list_mutex);
13ff3d6f 2830 release_proto_idx(prot);
0a3f4358 2831 list_del(&prot->node);
36b77a52 2832 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2833
2834 if (prot->slab != NULL) {
2835 kmem_cache_destroy(prot->slab);
2836 prot->slab = NULL;
2837 }
2838
0159dfd3 2839 req_prot_cleanup(prot->rsk_prot);
2e6599cb 2840
6d6ee43e 2841 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2842 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2843 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2844 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2845 }
1da177e4 2846}
1da177e4
LT		 2847EXPORT_SYMBOL(proto_unregister);
2848
2849#ifdef CONFIG_PROC_FS
1da177e4 2850static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2851 __acquires(proto_list_mutex)
1da177e4 2852{
36b77a52 2853 mutex_lock(&proto_list_mutex);
60f0438a 2854 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2855}
2856
2857static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2858{
60f0438a 2859 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2860}
2861
2862static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2863 __releases(proto_list_mutex)
1da177e4 2864{
36b77a52 2865 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2866}
2867
2868static char proto_method_implemented(const void *method)
2869{
2870 return method == NULL ? 'n' : 'y';
2871}
180d8cd9
GC		 2872static long sock_prot_memory_allocated(struct proto *proto)
2873{
cb75a36c 2874 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2875}
2876
2877static char *sock_prot_memory_pressure(struct proto *proto)
2878{
2879 return proto->memory_pressure != NULL ?
2880 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2881}
1da177e4
LT		 2882
2883static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2884{
180d8cd9 2885
8d987e5c 2886 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2887 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2888 proto->name,
2889 proto->obj_size,
14e943db 2890 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2891 sock_prot_memory_allocated(proto),
2892 sock_prot_memory_pressure(proto),
1da177e4
LT		 2893 proto->max_header,
2894 proto->slab == NULL ? "no" : "yes",
2895 module_name(proto->owner),
2896 proto_method_implemented(proto->close),
2897 proto_method_implemented(proto->connect),
2898 proto_method_implemented(proto->disconnect),
2899 proto_method_implemented(proto->accept),
2900 proto_method_implemented(proto->ioctl),
2901 proto_method_implemented(proto->init),
2902 proto_method_implemented(proto->destroy),
2903 proto_method_implemented(proto->shutdown),
2904 proto_method_implemented(proto->setsockopt),
2905 proto_method_implemented(proto->getsockopt),
2906 proto_method_implemented(proto->sendmsg),
2907 proto_method_implemented(proto->recvmsg),
2908 proto_method_implemented(proto->sendpage),
2909 proto_method_implemented(proto->bind),
2910 proto_method_implemented(proto->backlog_rcv),
2911 proto_method_implemented(proto->hash),
2912 proto_method_implemented(proto->unhash),
2913 proto_method_implemented(proto->get_port),
2914 proto_method_implemented(proto->enter_memory_pressure));
2915}
2916
2917static int proto_seq_show(struct seq_file *seq, void *v)
2918{
60f0438a 2919 if (v == &proto_list)
1da177e4
LT		 2920 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2921 "protocol",
2922 "size",
2923 "sockets",
2924 "memory",
2925 "press",
2926 "maxhdr",
2927 "slab",
2928 "module",
2929 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2930 else
60f0438a 2931 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2932 return 0;
2933}
2934
f690808e 2935static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2936 .start = proto_seq_start,
2937 .next = proto_seq_next,
2938 .stop = proto_seq_stop,
2939 .show = proto_seq_show,
2940};
2941
2942static int proto_seq_open(struct inode *inode, struct file *file)
2943{
14e943db
ED		 2944 return seq_open_net(inode, file, &proto_seq_ops,
2945 sizeof(struct seq_net_private));
1da177e4
LT		 2946}
2947
9a32144e 2948static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2949 .owner = THIS_MODULE,
2950 .open = proto_seq_open,
2951 .read = seq_read,
2952 .llseek = seq_lseek,
14e943db
ED		 2953 .release = seq_release_net,
2954};
2955
2956static __net_init int proto_init_net(struct net *net)
2957{
d4beaa66 2958 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 2959 return -ENOMEM;
2960
2961 return 0;
2962}
2963
2964static __net_exit void proto_exit_net(struct net *net)
2965{
ece31ffd 2966 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 2967}
2968
2969
2970static __net_initdata struct pernet_operations proto_net_ops = {
2971 .init = proto_init_net,
2972 .exit = proto_exit_net,
1da177e4
LT		 2973};
2974
2975static int __init proto_init(void)
2976{
14e943db 2977 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2978}
2979
2980subsys_initcall(proto_init);
2981
2982#endif /* PROC_FS */
Linux 6.x block layer and io_uring tree(s)