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tcp: tcp_tso_autosize() minimum is one packet
[deliverable/linux.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
4ec93edb 35 * code. The ACK stuff can wait and needs major
1da177e4
LT		 36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 *
85 *
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
90 */
91
e005d193
JP		 92#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
93
4fc268d2 94#include <linux/capability.h>
1da177e4 95#include <linux/errno.h>
cb820f8e 96#include <linux/errqueue.h>
1da177e4
LT		 97#include <linux/types.h>
98#include <linux/socket.h>
99#include <linux/in.h>
100#include <linux/kernel.h>
1da177e4
LT		 101#include <linux/module.h>
102#include <linux/proc_fs.h>
103#include <linux/seq_file.h>
104#include <linux/sched.h>
105#include <linux/timer.h>
106#include <linux/string.h>
107#include <linux/sockios.h>
108#include <linux/net.h>
109#include <linux/mm.h>
110#include <linux/slab.h>
111#include <linux/interrupt.h>
112#include <linux/poll.h>
113#include <linux/tcp.h>
114#include <linux/init.h>
a1f8e7f7 115#include <linux/highmem.h>
3f551f94 116#include <linux/user_namespace.h>
c5905afb 117#include <linux/static_key.h>
3969eb38 118#include <linux/memcontrol.h>
8c1ae10d 119#include <linux/prefetch.h>
1da177e4
LT		 120
121#include <asm/uaccess.h>
1da177e4
LT		 122
123#include <linux/netdevice.h>
124#include <net/protocol.h>
125#include <linux/skbuff.h>
457c4cbc 126#include <net/net_namespace.h>
2e6599cb 127#include <net/request_sock.h>
1da177e4 128#include <net/sock.h>
20d49473 129#include <linux/net_tstamp.h>
1da177e4
LT		 130#include <net/xfrm.h>
131#include <linux/ipsec.h>
f8451725 132#include <net/cls_cgroup.h>
5bc1421e 133#include <net/netprio_cgroup.h>
1da177e4
LT		 134
135#include <linux/filter.h>
136
3847ce32
SM		 137#include <trace/events/sock.h>
138
1da177e4
LT		 139#ifdef CONFIG_INET
140#include <net/tcp.h>
141#endif
142
076bb0c8 143#include <net/busy_poll.h>
06021292 144
36b77a52 145static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 146static LIST_HEAD(proto_list);
147
a3b299da
EB		 148/**
149 * sk_ns_capable - General socket capability test
150 * @sk: Socket to use a capability on or through
151 * @user_ns: The user namespace of the capability to use
152 * @cap: The capability to use
153 *
154 * Test to see if the opener of the socket had when the socket was
155 * created and the current process has the capability @cap in the user
156 * namespace @user_ns.
157 */
158bool sk_ns_capable(const struct sock *sk,
159 struct user_namespace *user_ns, int cap)
160{
161 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
162 ns_capable(user_ns, cap);
163}
164EXPORT_SYMBOL(sk_ns_capable);
165
166/**
167 * sk_capable - Socket global capability test
168 * @sk: Socket to use a capability on or through
e793c0f7 169 * @cap: The global capability to use
a3b299da
EB		 170 *
171 * Test to see if the opener of the socket had when the socket was
172 * created and the current process has the capability @cap in all user
173 * namespaces.
174 */
175bool sk_capable(const struct sock *sk, int cap)
176{
177 return sk_ns_capable(sk, &init_user_ns, cap);
178}
179EXPORT_SYMBOL(sk_capable);
180
181/**
182 * sk_net_capable - Network namespace socket capability test
183 * @sk: Socket to use a capability on or through
184 * @cap: The capability to use
185 *
e793c0f7 186 * Test to see if the opener of the socket had when the socket was created
a3b299da
EB		 187 * and the current process has the capability @cap over the network namespace
188 * the socket is a member of.
189 */
190bool sk_net_capable(const struct sock *sk, int cap)
191{
192 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
193}
194EXPORT_SYMBOL(sk_net_capable);
195
196
c255a458 197#ifdef CONFIG_MEMCG_KMEM
1d62e436 198int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
d1a4c0b3
GC		 199{
200 struct proto *proto;
201 int ret = 0;
202
36b77a52 203 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 204 list_for_each_entry(proto, &proto_list, node) {
205 if (proto->init_cgroup) {
1d62e436 206 ret = proto->init_cgroup(memcg, ss);
d1a4c0b3
GC		 207 if (ret)
208 goto out;
209 }
210 }
211
36b77a52 212 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 213 return ret;
214out:
215 list_for_each_entry_continue_reverse(proto, &proto_list, node)
216 if (proto->destroy_cgroup)
1d62e436 217 proto->destroy_cgroup(memcg);
36b77a52 218 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 219 return ret;
220}
221
1d62e436 222void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
d1a4c0b3
GC		 223{
224 struct proto *proto;
225
36b77a52 226 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 227 list_for_each_entry_reverse(proto, &proto_list, node)
228 if (proto->destroy_cgroup)
1d62e436 229 proto->destroy_cgroup(memcg);
36b77a52 230 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 231}
232#endif
233
da21f24d
IM		 234/*
235 * Each address family might have different locking rules, so we have
236 * one slock key per address family:
237 */
a5b5bb9a
IM		 238static struct lock_class_key af_family_keys[AF_MAX];
239static struct lock_class_key af_family_slock_keys[AF_MAX];
240
cbda4eaf 241#if defined(CONFIG_MEMCG_KMEM)
c5905afb 242struct static_key memcg_socket_limit_enabled;
e1aab161 243EXPORT_SYMBOL(memcg_socket_limit_enabled);
cbda4eaf 244#endif
e1aab161 245
a5b5bb9a
IM		 246/*
247 * Make lock validator output more readable. (we pre-construct these
248 * strings build-time, so that runtime initialization of socket
249 * locks is fast):
250 */
36cbd3dc 251static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 252 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
253 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
254 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
255 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
256 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
257 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
258 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 259 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 260 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 261 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 262 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 263 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 264 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
456db6a4 265 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX"
a5b5bb9a 266};
36cbd3dc 267static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 268 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
269 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
270 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
271 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
272 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
273 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
274 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 275 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 276 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 277 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 278 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 279 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 280 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
456db6a4 281 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX"
a5b5bb9a 282};
36cbd3dc 283static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 284 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
285 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
286 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
287 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
288 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
289 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
290 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 291 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 292 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 293 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 294 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 295 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 296 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
456db6a4 297 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX"
443aef0e 298};
da21f24d
IM		 299
300/*
301 * sk_callback_lock locking rules are per-address-family,
302 * so split the lock classes by using a per-AF key:
303 */
304static struct lock_class_key af_callback_keys[AF_MAX];
305
1da177e4
LT		 306/* Take into consideration the size of the struct sk_buff overhead in the
307 * determination of these values, since that is non-constant across
308 * platforms. This makes socket queueing behavior and performance
309 * not depend upon such differences.
310 */
311#define _SK_MEM_PACKETS 256
87fb4b7b 312#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 313#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
314#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
315
316/* Run time adjustable parameters. */
ab32ea5d 317__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 318EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 319__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 320EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 321__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
322__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 323
25985edc 324/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 325int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 326EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 327
b245be1f
WB		 328int sysctl_tstamp_allow_data __read_mostly = 1;
329
c93bdd0e
MG		 330struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
331EXPORT_SYMBOL_GPL(memalloc_socks);
332
7cb02404
MG		 333/**
334 * sk_set_memalloc - sets %SOCK_MEMALLOC
335 * @sk: socket to set it on
336 *
337 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
338 * It's the responsibility of the admin to adjust min_free_kbytes
339 * to meet the requirements
340 */
341void sk_set_memalloc(struct sock *sk)
342{
343 sock_set_flag(sk, SOCK_MEMALLOC);
344 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 345 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 346}
347EXPORT_SYMBOL_GPL(sk_set_memalloc);
348
349void sk_clear_memalloc(struct sock *sk)
350{
351 sock_reset_flag(sk, SOCK_MEMALLOC);
352 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 353 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 354
355 /*
356 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
357 * progress of swapping. However, if SOCK_MEMALLOC is cleared while
358 * it has rmem allocations there is a risk that the user of the
359 * socket cannot make forward progress due to exceeding the rmem
360 * limits. By rights, sk_clear_memalloc() should only be called
361 * on sockets being torn down but warn and reset the accounting if
362 * that assumption breaks.
363 */
364 if (WARN_ON(sk->sk_forward_alloc))
365 sk_mem_reclaim(sk);
7cb02404
MG		 366}
367EXPORT_SYMBOL_GPL(sk_clear_memalloc);
368
b4b9e355
MG		 369int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
370{
371 int ret;
372 unsigned long pflags = current->flags;
373
374 /* these should have been dropped before queueing */
375 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
376
377 current->flags |= PF_MEMALLOC;
378 ret = sk->sk_backlog_rcv(sk, skb);
379 tsk_restore_flags(current, pflags, PF_MEMALLOC);
380
381 return ret;
382}
383EXPORT_SYMBOL(__sk_backlog_rcv);
384
1da177e4
LT		 385static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
386{
387 struct timeval tv;
388
389 if (optlen < sizeof(tv))
390 return -EINVAL;
391 if (copy_from_user(&tv, optval, sizeof(tv)))
392 return -EFAULT;
ba78073e
VA		 393 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
394 return -EDOM;
1da177e4 395
ba78073e 396 if (tv.tv_sec < 0) {
6f11df83
AM		 397 static int warned __read_mostly;
398
ba78073e 399 *timeo_p = 0;
50aab54f 400 if (warned < 10 && net_ratelimit()) {
ba78073e 401 warned++;
e005d193
JP		 402 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
403 __func__, current->comm, task_pid_nr(current));
50aab54f 404 }
ba78073e
VA		 405 return 0;
406 }
1da177e4
LT		 407 *timeo_p = MAX_SCHEDULE_TIMEOUT;
408 if (tv.tv_sec == 0 && tv.tv_usec == 0)
409 return 0;
410 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
411 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
412 return 0;
413}
414
415static void sock_warn_obsolete_bsdism(const char *name)
416{
417 static int warned;
418 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 419 if (strcmp(warncomm, current->comm) && warned < 5) {
420 strcpy(warncomm, current->comm);
e005d193
JP		 421 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
422 warncomm, name);
1da177e4
LT		 423 warned++;
424 }
425}
426
08e29af3
ED		 427#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
428
429static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 430{
08e29af3
ED		 431 if (sk->sk_flags & flags) {
432 sk->sk_flags &= ~flags;
433 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 434 net_disable_timestamp();
1da177e4
LT		 435 }
436}
437
438
f0088a50
DV		 439int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
440{
766e9037 441 int err;
3b885787
NH		 442 unsigned long flags;
443 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 444
0fd7bac6 445 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 446 atomic_inc(&sk->sk_drops);
3847ce32 447 trace_sock_rcvqueue_full(sk, skb);
766e9037 448 return -ENOMEM;
f0088a50
DV		 449 }
450
fda9ef5d 451 err = sk_filter(sk, skb);
f0088a50 452 if (err)
766e9037 453 return err;
f0088a50 454
c76562b6 455 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 456 atomic_inc(&sk->sk_drops);
457 return -ENOBUFS;
3ab224be
HA		 458 }
459
f0088a50
DV		 460 skb->dev = NULL;
461 skb_set_owner_r(skb, sk);
49ad9599 462
7fee226a
ED		 463 /* we escape from rcu protected region, make sure we dont leak
464 * a norefcounted dst
465 */
466 skb_dst_force(skb);
467
3b885787 468 spin_lock_irqsave(&list->lock, flags);
3bc3b96f 469 sock_skb_set_dropcount(sk, skb);
3b885787
NH		 470 __skb_queue_tail(list, skb);
471 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 472
473 if (!sock_flag(sk, SOCK_DEAD))
676d2369 474 sk->sk_data_ready(sk);
766e9037 475 return 0;
f0088a50
DV		 476}
477EXPORT_SYMBOL(sock_queue_rcv_skb);
478
58a5a7b9 479int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 480{
481 int rc = NET_RX_SUCCESS;
482
fda9ef5d 483 if (sk_filter(sk, skb))
f0088a50
DV		 484 goto discard_and_relse;
485
486 skb->dev = NULL;
487
274f482d 488 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 489 atomic_inc(&sk->sk_drops);
490 goto discard_and_relse;
491 }
58a5a7b9
ACM		 492 if (nested)
493 bh_lock_sock_nested(sk);
494 else
495 bh_lock_sock(sk);
a5b5bb9a
IM		 496 if (!sock_owned_by_user(sk)) {
497 /*
498 * trylock + unlock semantics:
499 */
500 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
501
c57943a1 502 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 503
504 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 505 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 506 bh_unlock_sock(sk);
507 atomic_inc(&sk->sk_drops);
508 goto discard_and_relse;
509 }
510
f0088a50
DV		 511 bh_unlock_sock(sk);
512out:
513 sock_put(sk);
514 return rc;
515discard_and_relse:
516 kfree_skb(skb);
517 goto out;
518}
519EXPORT_SYMBOL(sk_receive_skb);
520
521struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
522{
b6c6712a 523 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 524
525 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 526 sk_tx_queue_clear(sk);
a9b3cd7f 527 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 528 dst_release(dst);
529 return NULL;
530 }
531
532 return dst;
533}
534EXPORT_SYMBOL(__sk_dst_check);
535
536struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
537{
538 struct dst_entry *dst = sk_dst_get(sk);
539
540 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
541 sk_dst_reset(sk);
542 dst_release(dst);
543 return NULL;
544 }
545
546 return dst;
547}
548EXPORT_SYMBOL(sk_dst_check);
549
c91f6df2
BH		 550static int sock_setbindtodevice(struct sock *sk, char __user *optval,
551 int optlen)
4878809f
DM		 552{
553 int ret = -ENOPROTOOPT;
554#ifdef CONFIG_NETDEVICES
3b1e0a65 555 struct net *net = sock_net(sk);
4878809f
DM		 556 char devname[IFNAMSIZ];
557 int index;
558
559 /* Sorry... */
560 ret = -EPERM;
5e1fccc0 561 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 562 goto out;
563
564 ret = -EINVAL;
565 if (optlen < 0)
566 goto out;
567
568 /* Bind this socket to a particular device like "eth0",
569 * as specified in the passed interface name. If the
570 * name is "" or the option length is zero the socket
571 * is not bound.
572 */
573 if (optlen > IFNAMSIZ - 1)
574 optlen = IFNAMSIZ - 1;
575 memset(devname, 0, sizeof(devname));
576
577 ret = -EFAULT;
578 if (copy_from_user(devname, optval, optlen))
579 goto out;
580
000ba2e4
DM		 581 index = 0;
582 if (devname[0] != '\0') {
bf8e56bf 583 struct net_device *dev;
4878809f 584
bf8e56bf
ED		 585 rcu_read_lock();
586 dev = dev_get_by_name_rcu(net, devname);
587 if (dev)
588 index = dev->ifindex;
589 rcu_read_unlock();
4878809f
DM		 590 ret = -ENODEV;
591 if (!dev)
592 goto out;
4878809f
DM		 593 }
594
595 lock_sock(sk);
596 sk->sk_bound_dev_if = index;
597 sk_dst_reset(sk);
598 release_sock(sk);
599
600 ret = 0;
601
602out:
603#endif
604
605 return ret;
606}
607
c91f6df2
BH		 608static int sock_getbindtodevice(struct sock *sk, char __user *optval,
609 int __user *optlen, int len)
610{
611 int ret = -ENOPROTOOPT;
612#ifdef CONFIG_NETDEVICES
613 struct net *net = sock_net(sk);
c91f6df2 614 char devname[IFNAMSIZ];
c91f6df2
BH		 615
616 if (sk->sk_bound_dev_if == 0) {
617 len = 0;
618 goto zero;
619 }
620
621 ret = -EINVAL;
622 if (len < IFNAMSIZ)
623 goto out;
624
5dbe7c17
NS		 625 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
626 if (ret)
c91f6df2 627 goto out;
c91f6df2
BH		 628
629 len = strlen(devname) + 1;
630
631 ret = -EFAULT;
632 if (copy_to_user(optval, devname, len))
633 goto out;
634
635zero:
636 ret = -EFAULT;
637 if (put_user(len, optlen))
638 goto out;
639
640 ret = 0;
641
642out:
643#endif
644
645 return ret;
646}
647
c0ef877b
PE		 648static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
649{
650 if (valbool)
651 sock_set_flag(sk, bit);
652 else
653 sock_reset_flag(sk, bit);
654}
655
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
11aa9c28 1399 * @kern: is this to be a kernel socket?
1da177e4 1400 */
1b8d7ae4 1401struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
11aa9c28 1402 struct proto *prot, int kern)
1da177e4 1403{
c308c1b2 1404 struct sock *sk;
1da177e4 1405
154adbc8 1406 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1407 if (sk) {
154adbc8
PE		 1408 sk->sk_family = family;
1409 /*
1410 * See comment in struct sock definition to understand
1411 * why we need sk_prot_creator -acme
1412 */
1413 sk->sk_prot = sk->sk_prot_creator = prot;
1414 sock_lock_init(sk);
26abe143
EB		 1415 sk->sk_net_refcnt = kern ? 0 : 1;
1416 if (likely(sk->sk_net_refcnt))
1417 get_net(net);
1418 sock_net_set(sk, net);
d66ee058 1419 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1420
211d2f97 1421 sock_update_classid(sk);
6ffd4641 1422 sock_update_netprioidx(sk);
1da177e4 1423 }
a79af59e 1424
2e4afe7b 1425 return sk;
1da177e4 1426}
2a91525c 1427EXPORT_SYMBOL(sk_alloc);
1da177e4 1428
2b85a34e 1429static void __sk_free(struct sock *sk)
1da177e4
LT		 1430{
1431 struct sk_filter *filter;
1da177e4
LT		 1432
1433 if (sk->sk_destruct)
1434 sk->sk_destruct(sk);
1435
a898def2
PM		 1436 filter = rcu_dereference_check(sk->sk_filter,
1437 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1438 if (filter) {
309dd5fc 1439 sk_filter_uncharge(sk, filter);
a9b3cd7f 1440 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1441 }
1442
08e29af3 1443 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1444
1445 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1446 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1447 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1448
109f6e39
EB		 1449 if (sk->sk_peer_cred)
1450 put_cred(sk->sk_peer_cred);
1451 put_pid(sk->sk_peer_pid);
26abe143
EB		 1452 if (likely(sk->sk_net_refcnt))
1453 put_net(sock_net(sk));
c308c1b2 1454 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1455}
2b85a34e
ED		 1456
1457void sk_free(struct sock *sk)
1458{
1459 /*
25985edc 1460 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1461 * some packets are still in some tx queue.
1462 * If not null, sock_wfree() will call __sk_free(sk) later
1463 */
1464 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1465 __sk_free(sk);
1466}
2a91525c 1467EXPORT_SYMBOL(sk_free);
1da177e4 1468
475f1b52
SR		 1469static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1470{
1471 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1472 sock_update_memcg(newsk);
1473}
1474
e56c57d0
ED		 1475/**
1476 * sk_clone_lock - clone a socket, and lock its clone
1477 * @sk: the socket to clone
1478 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1479 *
1480 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1481 */
1482struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1483{
8fd1d178 1484 struct sock *newsk;
278571ba 1485 bool is_charged = true;
87d11ceb 1486
8fd1d178 1487 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1488 if (newsk != NULL) {
1489 struct sk_filter *filter;
1490
892c141e 1491 sock_copy(newsk, sk);
87d11ceb
ACM		 1492
1493 /* SANITY */
3b1e0a65 1494 get_net(sock_net(newsk));
87d11ceb
ACM		 1495 sk_node_init(&newsk->sk_node);
1496 sock_lock_init(newsk);
1497 bh_lock_sock(newsk);
fa438ccf 1498 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1499 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1500
1501 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1502 /*
1503 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1504 */
1505 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1506 atomic_set(&newsk->sk_omem_alloc, 0);
1507 skb_queue_head_init(&newsk->sk_receive_queue);
1508 skb_queue_head_init(&newsk->sk_write_queue);
1509
b6c6712a 1510 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1511 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1512 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1513 af_callback_keys + newsk->sk_family,
1514 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1515
1516 newsk->sk_dst_cache = NULL;
1517 newsk->sk_wmem_queued = 0;
1518 newsk->sk_forward_alloc = 0;
1519 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1520 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1521
1522 sock_reset_flag(newsk, SOCK_DONE);
1523 skb_queue_head_init(&newsk->sk_error_queue);
1524
0d7da9dd 1525 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb 1526 if (filter != NULL)
278571ba
AS		 1527 /* though it's an empty new sock, the charging may fail
1528 * if sysctl_optmem_max was changed between creation of
1529 * original socket and cloning
1530 */
1531 is_charged = sk_filter_charge(newsk, filter);
87d11ceb 1532
278571ba 1533 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk))) {
87d11ceb
ACM		 1534 /* It is still raw copy of parent, so invalidate
1535 * destructor and make plain sk_free() */
1536 newsk->sk_destruct = NULL;
b0691c8e 1537 bh_unlock_sock(newsk);
87d11ceb
ACM		 1538 sk_free(newsk);
1539 newsk = NULL;
1540 goto out;
1541 }
1542
1543 newsk->sk_err = 0;
1544 newsk->sk_priority = 0;
2c8c56e1 1545 newsk->sk_incoming_cpu = raw_smp_processor_id();
33cf7c90 1546 atomic64_set(&newsk->sk_cookie, 0);
4dc6dc71
ED		 1547 /*
1548 * Before updating sk_refcnt, we must commit prior changes to memory
1549 * (Documentation/RCU/rculist_nulls.txt for details)
1550 */
1551 smp_wmb();
87d11ceb
ACM		 1552 atomic_set(&newsk->sk_refcnt, 2);
1553
1554 /*
1555 * Increment the counter in the same struct proto as the master
1556 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1557 * is the same as sk->sk_prot->socks, as this field was copied
1558 * with memcpy).
1559 *
1560 * This _changes_ the previous behaviour, where
1561 * tcp_create_openreq_child always was incrementing the
1562 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1563 * to be taken into account in all callers. -acme
1564 */
1565 sk_refcnt_debug_inc(newsk);
972692e0 1566 sk_set_socket(newsk, NULL);
43815482 1567 newsk->sk_wq = NULL;
87d11ceb 1568
f3f511e1
GC		 1569 sk_update_clone(sk, newsk);
1570
87d11ceb 1571 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1572 sk_sockets_allocated_inc(newsk);
704da560 1573
08e29af3 1574 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1575 net_enable_timestamp();
87d11ceb
ACM		 1576 }
1577out:
1578 return newsk;
1579}
e56c57d0 1580EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1581
9958089a
AK		 1582void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1583{
d6a4e26a
ED		 1584 u32 max_segs = 1;
1585
9958089a
AK		 1586 __sk_dst_set(sk, dst);
1587 sk->sk_route_caps = dst->dev->features;
1588 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1589 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1590 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1591 if (sk_can_gso(sk)) {
82cc1a7a 1592 if (dst->header_len) {
9958089a 1593 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1594 } else {
9958089a 1595 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1596 sk->sk_gso_max_size = dst->dev->gso_max_size;
d6a4e26a 1597 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
82cc1a7a 1598 }
9958089a 1599 }
d6a4e26a 1600 sk->sk_gso_max_segs = max_segs;
9958089a
AK		 1601}
1602EXPORT_SYMBOL_GPL(sk_setup_caps);
1603
1da177e4
LT		 1604/*
1605 * Simple resource managers for sockets.
1606 */
1607
1608
4ec93edb
YH		 1609/*
1610 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1611 */
1612void sock_wfree(struct sk_buff *skb)
1613{
1614 struct sock *sk = skb->sk;
d99927f4 1615 unsigned int len = skb->truesize;
1da177e4 1616
d99927f4
ED		 1617 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1618 /*
1619 * Keep a reference on sk_wmem_alloc, this will be released
1620 * after sk_write_space() call
1621 */
1622 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1623 sk->sk_write_space(sk);
d99927f4
ED		 1624 len = 1;
1625 }
2b85a34e 1626 /*
d99927f4
ED		 1627 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1628 * could not do because of in-flight packets
2b85a34e 1629 */
d99927f4 1630 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1631 __sk_free(sk);
1da177e4 1632}
2a91525c 1633EXPORT_SYMBOL(sock_wfree);
1da177e4 1634
f2f872f9
ED		 1635void skb_orphan_partial(struct sk_buff *skb)
1636{
1637 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1638 * so we do not completely orphan skb, but transfert all
1639 * accounted bytes but one, to avoid unexpected reorders.
1640 */
1641 if (skb->destructor == sock_wfree
1642#ifdef CONFIG_INET
1643 || skb->destructor == tcp_wfree
1644#endif
1645 ) {
1646 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1647 skb->truesize = 1;
1648 } else {
1649 skb_orphan(skb);
1650 }
1651}
1652EXPORT_SYMBOL(skb_orphan_partial);
1653
4ec93edb
YH		 1654/*
1655 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1656 */
1657void sock_rfree(struct sk_buff *skb)
1658{
1659 struct sock *sk = skb->sk;
d361fd59 1660 unsigned int len = skb->truesize;
1da177e4 1661
d361fd59
ED		 1662 atomic_sub(len, &sk->sk_rmem_alloc);
1663 sk_mem_uncharge(sk, len);
1da177e4 1664}
2a91525c 1665EXPORT_SYMBOL(sock_rfree);
1da177e4 1666
7768eed8
OH		 1667/*
1668 * Buffer destructor for skbs that are not used directly in read or write
1669 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1670 */
62bccb8c
AD		 1671void sock_efree(struct sk_buff *skb)
1672{
1673 sock_put(skb->sk);
1674}
1675EXPORT_SYMBOL(sock_efree);
1676
976d0201 1677kuid_t sock_i_uid(struct sock *sk)
1da177e4 1678{
976d0201 1679 kuid_t uid;
1da177e4 1680
f064af1e 1681 read_lock_bh(&sk->sk_callback_lock);
976d0201 1682 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1683 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1684 return uid;
1685}
2a91525c 1686EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1687
1688unsigned long sock_i_ino(struct sock *sk)
1689{
1690 unsigned long ino;
1691
f064af1e 1692 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1693 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1694 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1695 return ino;
1696}
2a91525c 1697EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1698
1699/*
1700 * Allocate a skb from the socket's send buffer.
1701 */
86a76caf 1702struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1703 gfp_t priority)
1da177e4
LT		 1704{
1705 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1706 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1707 if (skb) {
1708 skb_set_owner_w(skb, sk);
1709 return skb;
1710 }
1711 }
1712 return NULL;
1713}
2a91525c 1714EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1715
4ec93edb 1716/*
1da177e4 1717 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1718 */
dd0fc66f 1719void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1720{
95c96174 1721 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1722 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1723 void *mem;
1724 /* First do the add, to avoid the race if kmalloc
4ec93edb 1725 * might sleep.
1da177e4
LT		 1726 */
1727 atomic_add(size, &sk->sk_omem_alloc);
1728 mem = kmalloc(size, priority);
1729 if (mem)
1730 return mem;
1731 atomic_sub(size, &sk->sk_omem_alloc);
1732 }
1733 return NULL;
1734}
2a91525c 1735EXPORT_SYMBOL(sock_kmalloc);
1da177e4 1736
79e88659
DB		 1737/* Free an option memory block. Note, we actually want the inline
1738 * here as this allows gcc to detect the nullify and fold away the
1739 * condition entirely.
1da177e4 1740 */
79e88659
DB		 1741static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1742 const bool nullify)
1da177e4 1743{
e53da5fb
DM		 1744 if (WARN_ON_ONCE(!mem))
1745 return;
79e88659
DB		 1746 if (nullify)
1747 kzfree(mem);
1748 else
1749 kfree(mem);
1da177e4
LT		 1750 atomic_sub(size, &sk->sk_omem_alloc);
1751}
79e88659
DB		 1752
1753void sock_kfree_s(struct sock *sk, void *mem, int size)
1754{
1755 __sock_kfree_s(sk, mem, size, false);
1756}
2a91525c 1757EXPORT_SYMBOL(sock_kfree_s);
1da177e4 1758
79e88659
DB		 1759void sock_kzfree_s(struct sock *sk, void *mem, int size)
1760{
1761 __sock_kfree_s(sk, mem, size, true);
1762}
1763EXPORT_SYMBOL(sock_kzfree_s);
1764
1da177e4
LT		 1765/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1766 I think, these locks should be removed for datagram sockets.
1767 */
2a91525c 1768static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1769{
1770 DEFINE_WAIT(wait);
1771
1772 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1773 for (;;) {
1774 if (!timeo)
1775 break;
1776 if (signal_pending(current))
1777 break;
1778 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1779 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1780 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1781 break;
1782 if (sk->sk_shutdown & SEND_SHUTDOWN)
1783 break;
1784 if (sk->sk_err)
1785 break;
1786 timeo = schedule_timeout(timeo);
1787 }
aa395145 1788 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1789 return timeo;
1790}
1791
1792
1793/*
1794 * Generic send/receive buffer handlers
1795 */
1796
4cc7f68d
HX		 1797struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1798 unsigned long data_len, int noblock,
28d64271 1799 int *errcode, int max_page_order)
1da177e4 1800{
2e4e4410 1801 struct sk_buff *skb;
1da177e4
LT		 1802 long timeo;
1803 int err;
1804
1da177e4 1805 timeo = sock_sndtimeo(sk, noblock);
2e4e4410 1806 for (;;) {
1da177e4
LT		 1807 err = sock_error(sk);
1808 if (err != 0)
1809 goto failure;
1810
1811 err = -EPIPE;
1812 if (sk->sk_shutdown & SEND_SHUTDOWN)
1813 goto failure;
1814
2e4e4410
ED		 1815 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
1816 break;
28d64271 1817
2e4e4410
ED		 1818 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1819 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1820 err = -EAGAIN;
1821 if (!timeo)
1da177e4 1822 goto failure;
2e4e4410
ED		 1823 if (signal_pending(current))
1824 goto interrupted;
1825 timeo = sock_wait_for_wmem(sk, timeo);
1da177e4 1826 }
2e4e4410
ED		 1827 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
1828 errcode, sk->sk_allocation);
1829 if (skb)
1830 skb_set_owner_w(skb, sk);
1da177e4
LT		 1831 return skb;
1832
1833interrupted:
1834 err = sock_intr_errno(timeo);
1835failure:
1836 *errcode = err;
1837 return NULL;
1838}
4cc7f68d 1839EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1840
4ec93edb 1841struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1842 int noblock, int *errcode)
1843{
28d64271 1844 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1845}
2a91525c 1846EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1847
5640f768
ED		 1848/* On 32bit arches, an skb frag is limited to 2^15 */
1849#define SKB_FRAG_PAGE_ORDER get_order(32768)
1850
400dfd3a
ED		 1851/**
1852 * skb_page_frag_refill - check that a page_frag contains enough room
1853 * @sz: minimum size of the fragment we want to get
1854 * @pfrag: pointer to page_frag
82d5e2b8 1855 * @gfp: priority for memory allocation
400dfd3a
ED		 1856 *
1857 * Note: While this allocator tries to use high order pages, there is
1858 * no guarantee that allocations succeed. Therefore, @sz MUST be
1859 * less or equal than PAGE_SIZE.
1860 */
d9b2938a 1861bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 1862{
5640f768
ED		 1863 if (pfrag->page) {
1864 if (atomic_read(&pfrag->page->_count) == 1) {
1865 pfrag->offset = 0;
1866 return true;
1867 }
400dfd3a 1868 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1869 return true;
1870 put_page(pfrag->page);
1871 }
1872
d9b2938a
ED		 1873 pfrag->offset = 0;
1874 if (SKB_FRAG_PAGE_ORDER) {
1875 pfrag->page = alloc_pages(gfp | __GFP_COMP |
1876 __GFP_NOWARN | __GFP_NORETRY,
1877 SKB_FRAG_PAGE_ORDER);
5640f768 1878 if (likely(pfrag->page)) {
d9b2938a 1879 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 1880 return true;
1881 }
d9b2938a
ED		 1882 }
1883 pfrag->page = alloc_page(gfp);
1884 if (likely(pfrag->page)) {
1885 pfrag->size = PAGE_SIZE;
1886 return true;
1887 }
400dfd3a
ED		 1888 return false;
1889}
1890EXPORT_SYMBOL(skb_page_frag_refill);
1891
1892bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1893{
1894 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1895 return true;
1896
5640f768
ED		 1897 sk_enter_memory_pressure(sk);
1898 sk_stream_moderate_sndbuf(sk);
1899 return false;
1900}
1901EXPORT_SYMBOL(sk_page_frag_refill);
1902
1da177e4 1903static void __lock_sock(struct sock *sk)
f39234d6
NK		 1904 __releases(&sk->sk_lock.slock)
1905 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1906{
1907 DEFINE_WAIT(wait);
1908
e71a4783 1909 for (;;) {
1da177e4
LT		 1910 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1911 TASK_UNINTERRUPTIBLE);
1912 spin_unlock_bh(&sk->sk_lock.slock);
1913 schedule();
1914 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1915 if (!sock_owned_by_user(sk))
1da177e4
LT		 1916 break;
1917 }
1918 finish_wait(&sk->sk_lock.wq, &wait);
1919}
1920
1921static void __release_sock(struct sock *sk)
f39234d6
NK		 1922 __releases(&sk->sk_lock.slock)
1923 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1924{
1925 struct sk_buff *skb = sk->sk_backlog.head;
1926
1927 do {
1928 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1929 bh_unlock_sock(sk);
1930
1931 do {
1932 struct sk_buff *next = skb->next;
1933
e4cbb02a 1934 prefetch(next);
7fee226a 1935 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1936 skb->next = NULL;
c57943a1 1937 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1938
1939 /*
1940 * We are in process context here with softirqs
1941 * disabled, use cond_resched_softirq() to preempt.
1942 * This is safe to do because we've taken the backlog
1943 * queue private:
1944 */
1945 cond_resched_softirq();
1946
1947 skb = next;
1948 } while (skb != NULL);
1949
1950 bh_lock_sock(sk);
e71a4783 1951 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1952
1953 /*
1954 * Doing the zeroing here guarantee we can not loop forever
1955 * while a wild producer attempts to flood us.
1956 */
1957 sk->sk_backlog.len = 0;
1da177e4
LT		 1958}
1959
1960/**
1961 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1962 * @sk: sock to wait on
1963 * @timeo: for how long
1da177e4
LT		 1964 *
1965 * Now socket state including sk->sk_err is changed only under lock,
1966 * hence we may omit checks after joining wait queue.
1967 * We check receive queue before schedule() only as optimization;
1968 * it is very likely that release_sock() added new data.
1969 */
1970int sk_wait_data(struct sock *sk, long *timeo)
1971{
1972 int rc;
1973 DEFINE_WAIT(wait);
1974
aa395145 1975 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1976 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1977 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1978 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1979 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1980 return rc;
1981}
1da177e4
LT		 1982EXPORT_SYMBOL(sk_wait_data);
1983
3ab224be
HA		 1984/**
1985 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1986 * @sk: socket
1987 * @size: memory size to allocate
1988 * @kind: allocation type
1989 *
1990 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1991 * rmem allocation. This function assumes that protocols which have
1992 * memory_pressure use sk_wmem_queued as write buffer accounting.
1993 */
1994int __sk_mem_schedule(struct sock *sk, int size, int kind)
1995{
1996 struct proto *prot = sk->sk_prot;
1997 int amt = sk_mem_pages(size);
8d987e5c 1998 long allocated;
e1aab161 1999 int parent_status = UNDER_LIMIT;
3ab224be
HA		 2000
2001 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 2002
e1aab161 2003 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 2004
2005 /* Under limit. */
e1aab161
GC		 2006 if (parent_status == UNDER_LIMIT &&
2007 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2008 sk_leave_memory_pressure(sk);
3ab224be
HA		 2009 return 1;
2010 }
2011
e1aab161
GC		 2012 /* Under pressure. (we or our parents) */
2013 if ((parent_status > SOFT_LIMIT) ||
2014 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2015 sk_enter_memory_pressure(sk);
3ab224be 2016
e1aab161
GC		 2017 /* Over hard limit (we or our parents) */
2018 if ((parent_status == OVER_LIMIT) ||
2019 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 2020 goto suppress_allocation;
2021
2022 /* guarantee minimum buffer size under pressure */
2023 if (kind == SK_MEM_RECV) {
2024 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2025 return 1;
180d8cd9 2026
3ab224be
HA		 2027 } else { /* SK_MEM_SEND */
2028 if (sk->sk_type == SOCK_STREAM) {
2029 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2030 return 1;
2031 } else if (atomic_read(&sk->sk_wmem_alloc) <
2032 prot->sysctl_wmem[0])
2033 return 1;
2034 }
2035
180d8cd9 2036 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2037 int alloc;
2038
180d8cd9 2039 if (!sk_under_memory_pressure(sk))
1748376b 2040 return 1;
180d8cd9
GC		 2041 alloc = sk_sockets_allocated_read_positive(sk);
2042 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2043 sk_mem_pages(sk->sk_wmem_queued +
2044 atomic_read(&sk->sk_rmem_alloc) +
2045 sk->sk_forward_alloc))
2046 return 1;
2047 }
2048
2049suppress_allocation:
2050
2051 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2052 sk_stream_moderate_sndbuf(sk);
2053
2054 /* Fail only if socket is _under_ its sndbuf.
2055 * In this case we cannot block, so that we have to fail.
2056 */
2057 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2058 return 1;
2059 }
2060
3847ce32
SM		 2061 trace_sock_exceed_buf_limit(sk, prot, allocated);
2062
3ab224be
HA		 2063 /* Alas. Undo changes. */
2064 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2065
0e90b31f 2066 sk_memory_allocated_sub(sk, amt);
180d8cd9 2067
3ab224be
HA		 2068 return 0;
2069}
3ab224be
HA		 2070EXPORT_SYMBOL(__sk_mem_schedule);
2071
2072/**
2073 * __sk_reclaim - reclaim memory_allocated
2074 * @sk: socket
1a24e04e 2075 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
3ab224be 2076 */
1a24e04e 2077void __sk_mem_reclaim(struct sock *sk, int amount)
3ab224be 2078{
1a24e04e
ED		 2079 amount >>= SK_MEM_QUANTUM_SHIFT;
2080 sk_memory_allocated_sub(sk, amount);
2081 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
3ab224be 2082
180d8cd9
GC		 2083 if (sk_under_memory_pressure(sk) &&
2084 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2085 sk_leave_memory_pressure(sk);
3ab224be 2086}
3ab224be
HA		 2087EXPORT_SYMBOL(__sk_mem_reclaim);
2088
2089
1da177e4
LT		 2090/*
2091 * Set of default routines for initialising struct proto_ops when
2092 * the protocol does not support a particular function. In certain
2093 * cases where it makes no sense for a protocol to have a "do nothing"
2094 * function, some default processing is provided.
2095 */
2096
2097int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2098{
2099 return -EOPNOTSUPP;
2100}
2a91525c 2101EXPORT_SYMBOL(sock_no_bind);
1da177e4 2102
4ec93edb 2103int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2104 int len, int flags)
2105{
2106 return -EOPNOTSUPP;
2107}
2a91525c 2108EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2109
2110int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2111{
2112 return -EOPNOTSUPP;
2113}
2a91525c 2114EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2115
2116int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2117{
2118 return -EOPNOTSUPP;
2119}
2a91525c 2120EXPORT_SYMBOL(sock_no_accept);
1da177e4 2121
4ec93edb 2122int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2123 int *len, int peer)
2124{
2125 return -EOPNOTSUPP;
2126}
2a91525c 2127EXPORT_SYMBOL(sock_no_getname);
1da177e4 2128
2a91525c 2129unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2130{
2131 return 0;
2132}
2a91525c 2133EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2134
2135int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2136{
2137 return -EOPNOTSUPP;
2138}
2a91525c 2139EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2140
2141int sock_no_listen(struct socket *sock, int backlog)
2142{
2143 return -EOPNOTSUPP;
2144}
2a91525c 2145EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2146
2147int sock_no_shutdown(struct socket *sock, int how)
2148{
2149 return -EOPNOTSUPP;
2150}
2a91525c 2151EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2152
2153int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2154 char __user *optval, unsigned int optlen)
1da177e4
LT		 2155{
2156 return -EOPNOTSUPP;
2157}
2a91525c 2158EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2159
2160int sock_no_getsockopt(struct socket *sock, int level, int optname,
2161 char __user *optval, int __user *optlen)
2162{
2163 return -EOPNOTSUPP;
2164}
2a91525c 2165EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4 2166
1b784140 2167int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
1da177e4
LT		 2168{
2169 return -EOPNOTSUPP;
2170}
2a91525c 2171EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4 2172
1b784140
YX		 2173int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2174 int flags)
1da177e4
LT		 2175{
2176 return -EOPNOTSUPP;
2177}
2a91525c 2178EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2179
2180int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2181{
2182 /* Mirror missing mmap method error code */
2183 return -ENODEV;
2184}
2a91525c 2185EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2186
2187ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2188{
2189 ssize_t res;
2190 struct msghdr msg = {.msg_flags = flags};
2191 struct kvec iov;
2192 char *kaddr = kmap(page);
2193 iov.iov_base = kaddr + offset;
2194 iov.iov_len = size;
2195 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2196 kunmap(page);
2197 return res;
2198}
2a91525c 2199EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2200
2201/*
2202 * Default Socket Callbacks
2203 */
2204
2205static void sock_def_wakeup(struct sock *sk)
2206{
43815482
ED		 2207 struct socket_wq *wq;
2208
2209 rcu_read_lock();
2210 wq = rcu_dereference(sk->sk_wq);
2211 if (wq_has_sleeper(wq))
2212 wake_up_interruptible_all(&wq->wait);
2213 rcu_read_unlock();
1da177e4
LT		 2214}
2215
2216static void sock_def_error_report(struct sock *sk)
2217{
43815482
ED		 2218 struct socket_wq *wq;
2219
2220 rcu_read_lock();
2221 wq = rcu_dereference(sk->sk_wq);
2222 if (wq_has_sleeper(wq))
2223 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2224 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2225 rcu_read_unlock();
1da177e4
LT		 2226}
2227
676d2369 2228static void sock_def_readable(struct sock *sk)
1da177e4 2229{
43815482
ED		 2230 struct socket_wq *wq;
2231
2232 rcu_read_lock();
2233 wq = rcu_dereference(sk->sk_wq);
2234 if (wq_has_sleeper(wq))
2c6607c6 2235 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2236 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2237 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2238 rcu_read_unlock();
1da177e4
LT		 2239}
2240
2241static void sock_def_write_space(struct sock *sk)
2242{
43815482
ED		 2243 struct socket_wq *wq;
2244
2245 rcu_read_lock();
1da177e4
LT		 2246
2247 /* Do not wake up a writer until he can make "significant"
2248 * progress. --DaveM
2249 */
e71a4783 2250 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2251 wq = rcu_dereference(sk->sk_wq);
2252 if (wq_has_sleeper(wq))
2253 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2254 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2255
2256 /* Should agree with poll, otherwise some programs break */
2257 if (sock_writeable(sk))
8d8ad9d7 2258 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2259 }
2260
43815482 2261 rcu_read_unlock();
1da177e4
LT		 2262}
2263
2264static void sock_def_destruct(struct sock *sk)
2265{
a51482bd 2266 kfree(sk->sk_protinfo);
1da177e4
LT		 2267}
2268
2269void sk_send_sigurg(struct sock *sk)
2270{
2271 if (sk->sk_socket && sk->sk_socket->file)
2272 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2273 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2274}
2a91525c 2275EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2276
2277void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2278 unsigned long expires)
2279{
2280 if (!mod_timer(timer, expires))
2281 sock_hold(sk);
2282}
1da177e4
LT		 2283EXPORT_SYMBOL(sk_reset_timer);
2284
2285void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2286{
25cc4ae9 2287 if (del_timer(timer))
1da177e4
LT		 2288 __sock_put(sk);
2289}
1da177e4
LT		 2290EXPORT_SYMBOL(sk_stop_timer);
2291
2292void sock_init_data(struct socket *sock, struct sock *sk)
2293{
2294 skb_queue_head_init(&sk->sk_receive_queue);
2295 skb_queue_head_init(&sk->sk_write_queue);
2296 skb_queue_head_init(&sk->sk_error_queue);
2297
2298 sk->sk_send_head = NULL;
2299
2300 init_timer(&sk->sk_timer);
4ec93edb 2301
1da177e4
LT		 2302 sk->sk_allocation = GFP_KERNEL;
2303 sk->sk_rcvbuf = sysctl_rmem_default;
2304 sk->sk_sndbuf = sysctl_wmem_default;
2305 sk->sk_state = TCP_CLOSE;
972692e0 2306 sk_set_socket(sk, sock);
1da177e4
LT		 2307
2308 sock_set_flag(sk, SOCK_ZAPPED);
2309
e71a4783 2310 if (sock) {
1da177e4 2311 sk->sk_type = sock->type;
43815482 2312 sk->sk_wq = sock->wq;
1da177e4
LT		 2313 sock->sk = sk;
2314 } else
43815482 2315 sk->sk_wq = NULL;
1da177e4 2316
b6c6712a 2317 spin_lock_init(&sk->sk_dst_lock);
1da177e4 2318 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2319 lockdep_set_class_and_name(&sk->sk_callback_lock,
2320 af_callback_keys + sk->sk_family,
2321 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2322
2323 sk->sk_state_change = sock_def_wakeup;
2324 sk->sk_data_ready = sock_def_readable;
2325 sk->sk_write_space = sock_def_write_space;
2326 sk->sk_error_report = sock_def_error_report;
2327 sk->sk_destruct = sock_def_destruct;
2328
5640f768
ED		 2329 sk->sk_frag.page = NULL;
2330 sk->sk_frag.offset = 0;
ef64a54f 2331 sk->sk_peek_off = -1;
1da177e4 2332
109f6e39
EB		 2333 sk->sk_peer_pid = NULL;
2334 sk->sk_peer_cred = NULL;
1da177e4
LT		 2335 sk->sk_write_pending = 0;
2336 sk->sk_rcvlowat = 1;
2337 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2338 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2339
f37f0afb 2340 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2341
e0d1095a 2342#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2343 sk->sk_napi_id = 0;
64b0dc51 2344 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2345#endif
2346
62748f32 2347 sk->sk_max_pacing_rate = ~0U;
7eec4174 2348 sk->sk_pacing_rate = ~0U;
4dc6dc71
ED		 2349 /*
2350 * Before updating sk_refcnt, we must commit prior changes to memory
2351 * (Documentation/RCU/rculist_nulls.txt for details)
2352 */
2353 smp_wmb();
1da177e4 2354 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2355 atomic_set(&sk->sk_drops, 0);
1da177e4 2356}
2a91525c 2357EXPORT_SYMBOL(sock_init_data);
1da177e4 2358
b5606c2d 2359void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2360{
2361 might_sleep();
a5b5bb9a 2362 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2363 if (sk->sk_lock.owned)
1da177e4 2364 __lock_sock(sk);
d2e9117c 2365 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2366 spin_unlock(&sk->sk_lock.slock);
2367 /*
2368 * The sk_lock has mutex_lock() semantics here:
2369 */
fcc70d5f 2370 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2371 local_bh_enable();
1da177e4 2372}
fcc70d5f 2373EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2374
b5606c2d 2375void release_sock(struct sock *sk)
1da177e4 2376{
a5b5bb9a
IM		 2377 /*
2378 * The sk_lock has mutex_unlock() semantics:
2379 */
2380 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2381
2382 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2383 if (sk->sk_backlog.tail)
2384 __release_sock(sk);
46d3ceab 2385
c3f9b018
ED		 2386 /* Warning : release_cb() might need to release sk ownership,
2387 * ie call sock_release_ownership(sk) before us.
2388 */
46d3ceab
ED		 2389 if (sk->sk_prot->release_cb)
2390 sk->sk_prot->release_cb(sk);
2391
c3f9b018 2392 sock_release_ownership(sk);
a5b5bb9a
IM		 2393 if (waitqueue_active(&sk->sk_lock.wq))
2394 wake_up(&sk->sk_lock.wq);
2395 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2396}
2397EXPORT_SYMBOL(release_sock);
2398
8a74ad60
ED		 2399/**
2400 * lock_sock_fast - fast version of lock_sock
2401 * @sk: socket
2402 *
2403 * This version should be used for very small section, where process wont block
2404 * return false if fast path is taken
2405 * sk_lock.slock locked, owned = 0, BH disabled
2406 * return true if slow path is taken
2407 * sk_lock.slock unlocked, owned = 1, BH enabled
2408 */
2409bool lock_sock_fast(struct sock *sk)
2410{
2411 might_sleep();
2412 spin_lock_bh(&sk->sk_lock.slock);
2413
2414 if (!sk->sk_lock.owned)
2415 /*
2416 * Note : We must disable BH
2417 */
2418 return false;
2419
2420 __lock_sock(sk);
2421 sk->sk_lock.owned = 1;
2422 spin_unlock(&sk->sk_lock.slock);
2423 /*
2424 * The sk_lock has mutex_lock() semantics here:
2425 */
2426 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2427 local_bh_enable();
2428 return true;
2429}
2430EXPORT_SYMBOL(lock_sock_fast);
2431
1da177e4 2432int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2433{
b7aa0bf7 2434 struct timeval tv;
1da177e4 2435 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2436 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2437 tv = ktime_to_timeval(sk->sk_stamp);
2438 if (tv.tv_sec == -1)
1da177e4 2439 return -ENOENT;
b7aa0bf7
ED		 2440 if (tv.tv_sec == 0) {
2441 sk->sk_stamp = ktime_get_real();
2442 tv = ktime_to_timeval(sk->sk_stamp);
2443 }
2444 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2445}
1da177e4
LT		 2446EXPORT_SYMBOL(sock_get_timestamp);
2447
ae40eb1e
ED		 2448int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2449{
2450 struct timespec ts;
2451 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2452 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2453 ts = ktime_to_timespec(sk->sk_stamp);
2454 if (ts.tv_sec == -1)
2455 return -ENOENT;
2456 if (ts.tv_sec == 0) {
2457 sk->sk_stamp = ktime_get_real();
2458 ts = ktime_to_timespec(sk->sk_stamp);
2459 }
2460 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2461}
2462EXPORT_SYMBOL(sock_get_timestampns);
2463
20d49473 2464void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2465{
20d49473 2466 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2467 unsigned long previous_flags = sk->sk_flags;
2468
20d49473
PO		 2469 sock_set_flag(sk, flag);
2470 /*
2471 * we just set one of the two flags which require net
2472 * time stamping, but time stamping might have been on
2473 * already because of the other one
2474 */
08e29af3 2475 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2476 net_enable_timestamp();
1da177e4
LT		 2477 }
2478}
1da177e4 2479
cb820f8e
RC		 2480int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2481 int level, int type)
2482{
2483 struct sock_exterr_skb *serr;
364a9e93 2484 struct sk_buff *skb;
cb820f8e
RC		 2485 int copied, err;
2486
2487 err = -EAGAIN;
364a9e93 2488 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 2489 if (skb == NULL)
2490 goto out;
2491
2492 copied = skb->len;
2493 if (copied > len) {
2494 msg->msg_flags |= MSG_TRUNC;
2495 copied = len;
2496 }
51f3d02b 2497 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 2498 if (err)
2499 goto out_free_skb;
2500
2501 sock_recv_timestamp(msg, sk, skb);
2502
2503 serr = SKB_EXT_ERR(skb);
2504 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2505
2506 msg->msg_flags |= MSG_ERRQUEUE;
2507 err = copied;
2508
cb820f8e
RC		 2509out_free_skb:
2510 kfree_skb(skb);
2511out:
2512 return err;
2513}
2514EXPORT_SYMBOL(sock_recv_errqueue);
2515
1da177e4
LT		 2516/*
2517 * Get a socket option on an socket.
2518 *
2519 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2520 * asynchronous errors should be reported by getsockopt. We assume
2521 * this means if you specify SO_ERROR (otherwise whats the point of it).
2522 */
2523int sock_common_getsockopt(struct socket *sock, int level, int optname,
2524 char __user *optval, int __user *optlen)
2525{
2526 struct sock *sk = sock->sk;
2527
2528 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2529}
1da177e4
LT		 2530EXPORT_SYMBOL(sock_common_getsockopt);
2531
3fdadf7d 2532#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2533int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2534 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2535{
2536 struct sock *sk = sock->sk;
2537
1e51f951 2538 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2539 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2540 optval, optlen);
3fdadf7d
DM		 2541 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2542}
2543EXPORT_SYMBOL(compat_sock_common_getsockopt);
2544#endif
2545
1b784140
YX		 2546int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2547 int flags)
1da177e4
LT		 2548{
2549 struct sock *sk = sock->sk;
2550 int addr_len = 0;
2551 int err;
2552
1b784140 2553 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
1da177e4
LT		 2554 flags & ~MSG_DONTWAIT, &addr_len);
2555 if (err >= 0)
2556 msg->msg_namelen = addr_len;
2557 return err;
2558}
1da177e4
LT		 2559EXPORT_SYMBOL(sock_common_recvmsg);
2560
2561/*
2562 * Set socket options on an inet socket.
2563 */
2564int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2565 char __user *optval, unsigned int optlen)
1da177e4
LT		 2566{
2567 struct sock *sk = sock->sk;
2568
2569 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2570}
1da177e4
LT		 2571EXPORT_SYMBOL(sock_common_setsockopt);
2572
3fdadf7d 2573#ifdef CONFIG_COMPAT
543d9cfe 2574int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2575 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2576{
2577 struct sock *sk = sock->sk;
2578
543d9cfe
ACM		 2579 if (sk->sk_prot->compat_setsockopt != NULL)
2580 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2581 optval, optlen);
3fdadf7d
DM		 2582 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2583}
2584EXPORT_SYMBOL(compat_sock_common_setsockopt);
2585#endif
2586
1da177e4
LT		 2587void sk_common_release(struct sock *sk)
2588{
2589 if (sk->sk_prot->destroy)
2590 sk->sk_prot->destroy(sk);
2591
2592 /*
2593 * Observation: when sock_common_release is called, processes have
2594 * no access to socket. But net still has.
2595 * Step one, detach it from networking:
2596 *
2597 * A. Remove from hash tables.
2598 */
2599
2600 sk->sk_prot->unhash(sk);
2601
2602 /*
2603 * In this point socket cannot receive new packets, but it is possible
2604 * that some packets are in flight because some CPU runs receiver and
2605 * did hash table lookup before we unhashed socket. They will achieve
2606 * receive queue and will be purged by socket destructor.
2607 *
2608 * Also we still have packets pending on receive queue and probably,
2609 * our own packets waiting in device queues. sock_destroy will drain
2610 * receive queue, but transmitted packets will delay socket destruction
2611 * until the last reference will be released.
2612 */
2613
2614 sock_orphan(sk);
2615
2616 xfrm_sk_free_policy(sk);
2617
e6848976 2618 sk_refcnt_debug_release(sk);
5640f768
ED		 2619
2620 if (sk->sk_frag.page) {
2621 put_page(sk->sk_frag.page);
2622 sk->sk_frag.page = NULL;
2623 }
2624
1da177e4
LT		 2625 sock_put(sk);
2626}
1da177e4
LT		 2627EXPORT_SYMBOL(sk_common_release);
2628
13ff3d6f
PE		 2629#ifdef CONFIG_PROC_FS
2630#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2631struct prot_inuse {
2632 int val[PROTO_INUSE_NR];
2633};
13ff3d6f
PE		 2634
2635static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2636
2637#ifdef CONFIG_NET_NS
2638void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2639{
d6d9ca0f 2640 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2641}
2642EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2643
2644int sock_prot_inuse_get(struct net *net, struct proto *prot)
2645{
2646 int cpu, idx = prot->inuse_idx;
2647 int res = 0;
2648
2649 for_each_possible_cpu(cpu)
2650 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2651
2652 return res >= 0 ? res : 0;
2653}
2654EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2655
2c8c1e72 2656static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2657{
2658 net->core.inuse = alloc_percpu(struct prot_inuse);
2659 return net->core.inuse ? 0 : -ENOMEM;
2660}
2661
2c8c1e72 2662static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2663{
2664 free_percpu(net->core.inuse);
2665}
2666
2667static struct pernet_operations net_inuse_ops = {
2668 .init = sock_inuse_init_net,
2669 .exit = sock_inuse_exit_net,
2670};
2671
2672static __init int net_inuse_init(void)
2673{
2674 if (register_pernet_subsys(&net_inuse_ops))
2675 panic("Cannot initialize net inuse counters");
2676
2677 return 0;
2678}
2679
2680core_initcall(net_inuse_init);
2681#else
1338d466
PE		 2682static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2683
c29a0bc4 2684void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2685{
d6d9ca0f 2686 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2687}
2688EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2689
c29a0bc4 2690int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2691{
2692 int cpu, idx = prot->inuse_idx;
2693 int res = 0;
2694
2695 for_each_possible_cpu(cpu)
2696 res += per_cpu(prot_inuse, cpu).val[idx];
2697
2698 return res >= 0 ? res : 0;
2699}
2700EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2701#endif
13ff3d6f
PE		 2702
2703static void assign_proto_idx(struct proto *prot)
2704{
2705 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2706
2707 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2708 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2709 return;
2710 }
2711
2712 set_bit(prot->inuse_idx, proto_inuse_idx);
2713}
2714
2715static void release_proto_idx(struct proto *prot)
2716{
2717 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2718 clear_bit(prot->inuse_idx, proto_inuse_idx);
2719}
2720#else
2721static inline void assign_proto_idx(struct proto *prot)
2722{
2723}
2724
2725static inline void release_proto_idx(struct proto *prot)
2726{
2727}
2728#endif
2729
0159dfd3
ED		 2730static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
2731{
2732 if (!rsk_prot)
2733 return;
2734 kfree(rsk_prot->slab_name);
2735 rsk_prot->slab_name = NULL;
2736 if (rsk_prot->slab) {
2737 kmem_cache_destroy(rsk_prot->slab);
2738 rsk_prot->slab = NULL;
2739 }
2740}
2741
2742static int req_prot_init(const struct proto *prot)
2743{
2744 struct request_sock_ops *rsk_prot = prot->rsk_prot;
2745
2746 if (!rsk_prot)
2747 return 0;
2748
2749 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
2750 prot->name);
2751 if (!rsk_prot->slab_name)
2752 return -ENOMEM;
2753
2754 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
2755 rsk_prot->obj_size, 0,
fa76ce73 2756 0, NULL);
0159dfd3
ED		 2757
2758 if (!rsk_prot->slab) {
2759 pr_crit("%s: Can't create request sock SLAB cache!\n",
2760 prot->name);
2761 return -ENOMEM;
2762 }
2763 return 0;
2764}
2765
b733c007
PE		 2766int proto_register(struct proto *prot, int alloc_slab)
2767{
1da177e4
LT		 2768 if (alloc_slab) {
2769 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2770 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2771 NULL);
1da177e4
LT		 2772
2773 if (prot->slab == NULL) {
e005d193
JP		 2774 pr_crit("%s: Can't create sock SLAB cache!\n",
2775 prot->name);
60e7663d 2776 goto out;
1da177e4 2777 }
2e6599cb 2778
0159dfd3
ED		 2779 if (req_prot_init(prot))
2780 goto out_free_request_sock_slab;
8feaf0c0 2781
6d6ee43e 2782 if (prot->twsk_prot != NULL) {
faf23422 2783 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2784
7e56b5d6 2785 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2786 goto out_free_request_sock_slab;
2787
6d6ee43e 2788 prot->twsk_prot->twsk_slab =
7e56b5d6 2789 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2790 prot->twsk_prot->twsk_obj_size,
3ab5aee7 2791 0,
52db70dc 2792 prot->slab_flags,
20c2df83 2793 NULL);
6d6ee43e 2794 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2795 goto out_free_timewait_sock_slab_name;
2796 }
1da177e4
LT		 2797 }
2798
36b77a52 2799 mutex_lock(&proto_list_mutex);
1da177e4 2800 list_add(&prot->node, &proto_list);
13ff3d6f 2801 assign_proto_idx(prot);
36b77a52 2802 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2803 return 0;
2804
8feaf0c0 2805out_free_timewait_sock_slab_name:
7e56b5d6 2806 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0 2807out_free_request_sock_slab:
0159dfd3
ED		 2808 req_prot_cleanup(prot->rsk_prot);
2809
2e6599cb
ACM		 2810 kmem_cache_destroy(prot->slab);
2811 prot->slab = NULL;
b733c007
PE		 2812out:
2813 return -ENOBUFS;
1da177e4 2814}
1da177e4
LT		 2815EXPORT_SYMBOL(proto_register);
2816
2817void proto_unregister(struct proto *prot)
2818{
36b77a52 2819 mutex_lock(&proto_list_mutex);
13ff3d6f 2820 release_proto_idx(prot);
0a3f4358 2821 list_del(&prot->node);
36b77a52 2822 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2823
2824 if (prot->slab != NULL) {
2825 kmem_cache_destroy(prot->slab);
2826 prot->slab = NULL;
2827 }
2828
0159dfd3 2829 req_prot_cleanup(prot->rsk_prot);
2e6599cb 2830
6d6ee43e 2831 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2832 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2833 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2834 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2835 }
1da177e4 2836}
1da177e4
LT		 2837EXPORT_SYMBOL(proto_unregister);
2838
2839#ifdef CONFIG_PROC_FS
1da177e4 2840static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2841 __acquires(proto_list_mutex)
1da177e4 2842{
36b77a52 2843 mutex_lock(&proto_list_mutex);
60f0438a 2844 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2845}
2846
2847static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2848{
60f0438a 2849 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2850}
2851
2852static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2853 __releases(proto_list_mutex)
1da177e4 2854{
36b77a52 2855 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2856}
2857
2858static char proto_method_implemented(const void *method)
2859{
2860 return method == NULL ? 'n' : 'y';
2861}
180d8cd9
GC		 2862static long sock_prot_memory_allocated(struct proto *proto)
2863{
cb75a36c 2864 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2865}
2866
2867static char *sock_prot_memory_pressure(struct proto *proto)
2868{
2869 return proto->memory_pressure != NULL ?
2870 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2871}
1da177e4
LT		 2872
2873static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2874{
180d8cd9 2875
8d987e5c 2876 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2877 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2878 proto->name,
2879 proto->obj_size,
14e943db 2880 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2881 sock_prot_memory_allocated(proto),
2882 sock_prot_memory_pressure(proto),
1da177e4
LT		 2883 proto->max_header,
2884 proto->slab == NULL ? "no" : "yes",
2885 module_name(proto->owner),
2886 proto_method_implemented(proto->close),
2887 proto_method_implemented(proto->connect),
2888 proto_method_implemented(proto->disconnect),
2889 proto_method_implemented(proto->accept),
2890 proto_method_implemented(proto->ioctl),
2891 proto_method_implemented(proto->init),
2892 proto_method_implemented(proto->destroy),
2893 proto_method_implemented(proto->shutdown),
2894 proto_method_implemented(proto->setsockopt),
2895 proto_method_implemented(proto->getsockopt),
2896 proto_method_implemented(proto->sendmsg),
2897 proto_method_implemented(proto->recvmsg),
2898 proto_method_implemented(proto->sendpage),
2899 proto_method_implemented(proto->bind),
2900 proto_method_implemented(proto->backlog_rcv),
2901 proto_method_implemented(proto->hash),
2902 proto_method_implemented(proto->unhash),
2903 proto_method_implemented(proto->get_port),
2904 proto_method_implemented(proto->enter_memory_pressure));
2905}
2906
2907static int proto_seq_show(struct seq_file *seq, void *v)
2908{
60f0438a 2909 if (v == &proto_list)
1da177e4
LT		 2910 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2911 "protocol",
2912 "size",
2913 "sockets",
2914 "memory",
2915 "press",
2916 "maxhdr",
2917 "slab",
2918 "module",
2919 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2920 else
60f0438a 2921 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2922 return 0;
2923}
2924
f690808e 2925static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2926 .start = proto_seq_start,
2927 .next = proto_seq_next,
2928 .stop = proto_seq_stop,
2929 .show = proto_seq_show,
2930};
2931
2932static int proto_seq_open(struct inode *inode, struct file *file)
2933{
14e943db
ED		 2934 return seq_open_net(inode, file, &proto_seq_ops,
2935 sizeof(struct seq_net_private));
1da177e4
LT		 2936}
2937
9a32144e 2938static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2939 .owner = THIS_MODULE,
2940 .open = proto_seq_open,
2941 .read = seq_read,
2942 .llseek = seq_lseek,
14e943db
ED		 2943 .release = seq_release_net,
2944};
2945
2946static __net_init int proto_init_net(struct net *net)
2947{
d4beaa66 2948 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 2949 return -ENOMEM;
2950
2951 return 0;
2952}
2953
2954static __net_exit void proto_exit_net(struct net *net)
2955{
ece31ffd 2956 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 2957}
2958
2959
2960static __net_initdata struct pernet_operations proto_net_ops = {
2961 .init = proto_init_net,
2962 .exit = proto_exit_net,
1da177e4
LT		 2963};
2964
2965static int __init proto_init(void)
2966{
14e943db 2967 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2968}
2969
2970subsys_initcall(proto_init);
2971
2972#endif /* PROC_FS */
Linux kernel - Deliverables
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