projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
net: Move the comment about unsettable socket-level options to default clause and...
[deliverable/linux.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
4ec93edb 35 * code. The ACK stuff can wait and needs major
1da177e4
LT		 36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 *
85 *
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
90 */
91
e005d193
JP		 92#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
93
4fc268d2 94#include <linux/capability.h>
1da177e4 95#include <linux/errno.h>
cb820f8e 96#include <linux/errqueue.h>
1da177e4
LT		 97#include <linux/types.h>
98#include <linux/socket.h>
99#include <linux/in.h>
100#include <linux/kernel.h>
1da177e4
LT		 101#include <linux/module.h>
102#include <linux/proc_fs.h>
103#include <linux/seq_file.h>
104#include <linux/sched.h>
105#include <linux/timer.h>
106#include <linux/string.h>
107#include <linux/sockios.h>
108#include <linux/net.h>
109#include <linux/mm.h>
110#include <linux/slab.h>
111#include <linux/interrupt.h>
112#include <linux/poll.h>
113#include <linux/tcp.h>
114#include <linux/init.h>
a1f8e7f7 115#include <linux/highmem.h>
3f551f94 116#include <linux/user_namespace.h>
c5905afb 117#include <linux/static_key.h>
3969eb38 118#include <linux/memcontrol.h>
8c1ae10d 119#include <linux/prefetch.h>
1da177e4
LT		 120
121#include <asm/uaccess.h>
1da177e4
LT		 122
123#include <linux/netdevice.h>
124#include <net/protocol.h>
125#include <linux/skbuff.h>
457c4cbc 126#include <net/net_namespace.h>
2e6599cb 127#include <net/request_sock.h>
1da177e4 128#include <net/sock.h>
20d49473 129#include <linux/net_tstamp.h>
1da177e4
LT		 130#include <net/xfrm.h>
131#include <linux/ipsec.h>
f8451725 132#include <net/cls_cgroup.h>
5bc1421e 133#include <net/netprio_cgroup.h>
1da177e4
LT		 134
135#include <linux/filter.h>
136
3847ce32
SM		 137#include <trace/events/sock.h>
138
1da177e4
LT		 139#ifdef CONFIG_INET
140#include <net/tcp.h>
141#endif
142
076bb0c8 143#include <net/busy_poll.h>
06021292 144
36b77a52 145static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 146static LIST_HEAD(proto_list);
147
a3b299da
EB		 148/**
149 * sk_ns_capable - General socket capability test
150 * @sk: Socket to use a capability on or through
151 * @user_ns: The user namespace of the capability to use
152 * @cap: The capability to use
153 *
154 * Test to see if the opener of the socket had when the socket was
155 * created and the current process has the capability @cap in the user
156 * namespace @user_ns.
157 */
158bool sk_ns_capable(const struct sock *sk,
159 struct user_namespace *user_ns, int cap)
160{
161 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
162 ns_capable(user_ns, cap);
163}
164EXPORT_SYMBOL(sk_ns_capable);
165
166/**
167 * sk_capable - Socket global capability test
168 * @sk: Socket to use a capability on or through
e793c0f7 169 * @cap: The global capability to use
a3b299da
EB		 170 *
171 * Test to see if the opener of the socket had when the socket was
172 * created and the current process has the capability @cap in all user
173 * namespaces.
174 */
175bool sk_capable(const struct sock *sk, int cap)
176{
177 return sk_ns_capable(sk, &init_user_ns, cap);
178}
179EXPORT_SYMBOL(sk_capable);
180
181/**
182 * sk_net_capable - Network namespace socket capability test
183 * @sk: Socket to use a capability on or through
184 * @cap: The capability to use
185 *
e793c0f7 186 * Test to see if the opener of the socket had when the socket was created
a3b299da
EB		 187 * and the current process has the capability @cap over the network namespace
188 * the socket is a member of.
189 */
190bool sk_net_capable(const struct sock *sk, int cap)
191{
192 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
193}
194EXPORT_SYMBOL(sk_net_capable);
195
196
c255a458 197#ifdef CONFIG_MEMCG_KMEM
1d62e436 198int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
d1a4c0b3
GC		 199{
200 struct proto *proto;
201 int ret = 0;
202
36b77a52 203 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 204 list_for_each_entry(proto, &proto_list, node) {
205 if (proto->init_cgroup) {
1d62e436 206 ret = proto->init_cgroup(memcg, ss);
d1a4c0b3
GC		 207 if (ret)
208 goto out;
209 }
210 }
211
36b77a52 212 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 213 return ret;
214out:
215 list_for_each_entry_continue_reverse(proto, &proto_list, node)
216 if (proto->destroy_cgroup)
1d62e436 217 proto->destroy_cgroup(memcg);
36b77a52 218 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 219 return ret;
220}
221
1d62e436 222void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
d1a4c0b3
GC		 223{
224 struct proto *proto;
225
36b77a52 226 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 227 list_for_each_entry_reverse(proto, &proto_list, node)
228 if (proto->destroy_cgroup)
1d62e436 229 proto->destroy_cgroup(memcg);
36b77a52 230 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 231}
232#endif
233
da21f24d
IM		 234/*
235 * Each address family might have different locking rules, so we have
236 * one slock key per address family:
237 */
a5b5bb9a
IM		 238static struct lock_class_key af_family_keys[AF_MAX];
239static struct lock_class_key af_family_slock_keys[AF_MAX];
240
cbda4eaf 241#if defined(CONFIG_MEMCG_KMEM)
c5905afb 242struct static_key memcg_socket_limit_enabled;
e1aab161 243EXPORT_SYMBOL(memcg_socket_limit_enabled);
cbda4eaf 244#endif
e1aab161 245
a5b5bb9a
IM		 246/*
247 * Make lock validator output more readable. (we pre-construct these
248 * strings build-time, so that runtime initialization of socket
249 * locks is fast):
250 */
36cbd3dc 251static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 252 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
253 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
254 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
255 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
256 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
257 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
258 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 259 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 260 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 261 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 262 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 263 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 264 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
456db6a4 265 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX"
a5b5bb9a 266};
36cbd3dc 267static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 268 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
269 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
270 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
271 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
272 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
273 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
274 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 275 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 276 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 277 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 278 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 279 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 280 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
456db6a4 281 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX"
a5b5bb9a 282};
36cbd3dc 283static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 284 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
285 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
286 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
287 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
288 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
289 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
290 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 291 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 292 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 293 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 294 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 295 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 296 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
456db6a4 297 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX"
443aef0e 298};
da21f24d
IM		 299
300/*
301 * sk_callback_lock locking rules are per-address-family,
302 * so split the lock classes by using a per-AF key:
303 */
304static struct lock_class_key af_callback_keys[AF_MAX];
305
1da177e4
LT		 306/* Take into consideration the size of the struct sk_buff overhead in the
307 * determination of these values, since that is non-constant across
308 * platforms. This makes socket queueing behavior and performance
309 * not depend upon such differences.
310 */
311#define _SK_MEM_PACKETS 256
87fb4b7b 312#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 313#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
314#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
315
316/* Run time adjustable parameters. */
ab32ea5d 317__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 318EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 319__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 320EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 321__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
322__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 323
25985edc 324/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 325int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 326EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 327
b245be1f
WB		 328int sysctl_tstamp_allow_data __read_mostly = 1;
329
c93bdd0e
MG		 330struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
331EXPORT_SYMBOL_GPL(memalloc_socks);
332
7cb02404
MG		 333/**
334 * sk_set_memalloc - sets %SOCK_MEMALLOC
335 * @sk: socket to set it on
336 *
337 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
338 * It's the responsibility of the admin to adjust min_free_kbytes
339 * to meet the requirements
340 */
341void sk_set_memalloc(struct sock *sk)
342{
343 sock_set_flag(sk, SOCK_MEMALLOC);
344 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 345 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 346}
347EXPORT_SYMBOL_GPL(sk_set_memalloc);
348
349void sk_clear_memalloc(struct sock *sk)
350{
351 sock_reset_flag(sk, SOCK_MEMALLOC);
352 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 353 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 354
355 /*
356 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
357 * progress of swapping. However, if SOCK_MEMALLOC is cleared while
358 * it has rmem allocations there is a risk that the user of the
359 * socket cannot make forward progress due to exceeding the rmem
360 * limits. By rights, sk_clear_memalloc() should only be called
361 * on sockets being torn down but warn and reset the accounting if
362 * that assumption breaks.
363 */
364 if (WARN_ON(sk->sk_forward_alloc))
365 sk_mem_reclaim(sk);
7cb02404
MG		 366}
367EXPORT_SYMBOL_GPL(sk_clear_memalloc);
368
b4b9e355
MG		 369int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
370{
371 int ret;
372 unsigned long pflags = current->flags;
373
374 /* these should have been dropped before queueing */
375 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
376
377 current->flags |= PF_MEMALLOC;
378 ret = sk->sk_backlog_rcv(sk, skb);
379 tsk_restore_flags(current, pflags, PF_MEMALLOC);
380
381 return ret;
382}
383EXPORT_SYMBOL(__sk_backlog_rcv);
384
1da177e4
LT		 385static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
386{
387 struct timeval tv;
388
389 if (optlen < sizeof(tv))
390 return -EINVAL;
391 if (copy_from_user(&tv, optval, sizeof(tv)))
392 return -EFAULT;
ba78073e
VA		 393 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
394 return -EDOM;
1da177e4 395
ba78073e 396 if (tv.tv_sec < 0) {
6f11df83
AM		 397 static int warned __read_mostly;
398
ba78073e 399 *timeo_p = 0;
50aab54f 400 if (warned < 10 && net_ratelimit()) {
ba78073e 401 warned++;
e005d193
JP		 402 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
403 __func__, current->comm, task_pid_nr(current));
50aab54f 404 }
ba78073e
VA		 405 return 0;
406 }
1da177e4
LT		 407 *timeo_p = MAX_SCHEDULE_TIMEOUT;
408 if (tv.tv_sec == 0 && tv.tv_usec == 0)
409 return 0;
410 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
411 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
412 return 0;
413}
414
415static void sock_warn_obsolete_bsdism(const char *name)
416{
417 static int warned;
418 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 419 if (strcmp(warncomm, current->comm) && warned < 5) {
420 strcpy(warncomm, current->comm);
e005d193
JP		 421 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
422 warncomm, name);
1da177e4
LT		 423 warned++;
424 }
425}
426
08e29af3
ED		 427#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
428
429static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 430{
08e29af3
ED		 431 if (sk->sk_flags & flags) {
432 sk->sk_flags &= ~flags;
433 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 434 net_disable_timestamp();
1da177e4
LT		 435 }
436}
437
438
f0088a50
DV		 439int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
440{
766e9037 441 int err;
3b885787
NH		 442 unsigned long flags;
443 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 444
0fd7bac6 445 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 446 atomic_inc(&sk->sk_drops);
3847ce32 447 trace_sock_rcvqueue_full(sk, skb);
766e9037 448 return -ENOMEM;
f0088a50
DV		 449 }
450
fda9ef5d 451 err = sk_filter(sk, skb);
f0088a50 452 if (err)
766e9037 453 return err;
f0088a50 454
c76562b6 455 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 456 atomic_inc(&sk->sk_drops);
457 return -ENOBUFS;
3ab224be
HA		 458 }
459
f0088a50
DV		 460 skb->dev = NULL;
461 skb_set_owner_r(skb, sk);
49ad9599 462
7fee226a
ED		 463 /* we escape from rcu protected region, make sure we dont leak
464 * a norefcounted dst
465 */
466 skb_dst_force(skb);
467
3b885787 468 spin_lock_irqsave(&list->lock, flags);
3bc3b96f 469 sock_skb_set_dropcount(sk, skb);
3b885787
NH		 470 __skb_queue_tail(list, skb);
471 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 472
473 if (!sock_flag(sk, SOCK_DEAD))
676d2369 474 sk->sk_data_ready(sk);
766e9037 475 return 0;
f0088a50
DV		 476}
477EXPORT_SYMBOL(sock_queue_rcv_skb);
478
58a5a7b9 479int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 480{
481 int rc = NET_RX_SUCCESS;
482
fda9ef5d 483 if (sk_filter(sk, skb))
f0088a50
DV		 484 goto discard_and_relse;
485
486 skb->dev = NULL;
487
274f482d 488 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 489 atomic_inc(&sk->sk_drops);
490 goto discard_and_relse;
491 }
58a5a7b9
ACM		 492 if (nested)
493 bh_lock_sock_nested(sk);
494 else
495 bh_lock_sock(sk);
a5b5bb9a
IM		 496 if (!sock_owned_by_user(sk)) {
497 /*
498 * trylock + unlock semantics:
499 */
500 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
501
c57943a1 502 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 503
504 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 505 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 506 bh_unlock_sock(sk);
507 atomic_inc(&sk->sk_drops);
508 goto discard_and_relse;
509 }
510
f0088a50
DV		 511 bh_unlock_sock(sk);
512out:
513 sock_put(sk);
514 return rc;
515discard_and_relse:
516 kfree_skb(skb);
517 goto out;
518}
519EXPORT_SYMBOL(sk_receive_skb);
520
521struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
522{
b6c6712a 523 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 524
525 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 526 sk_tx_queue_clear(sk);
a9b3cd7f 527 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 528 dst_release(dst);
529 return NULL;
530 }
531
532 return dst;
533}
534EXPORT_SYMBOL(__sk_dst_check);
535
536struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
537{
538 struct dst_entry *dst = sk_dst_get(sk);
539
540 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
541 sk_dst_reset(sk);
542 dst_release(dst);
543 return NULL;
544 }
545
546 return dst;
547}
548EXPORT_SYMBOL(sk_dst_check);
549
c91f6df2
BH		 550static int sock_setbindtodevice(struct sock *sk, char __user *optval,
551 int optlen)
4878809f
DM		 552{
553 int ret = -ENOPROTOOPT;
554#ifdef CONFIG_NETDEVICES
3b1e0a65 555 struct net *net = sock_net(sk);
4878809f
DM		 556 char devname[IFNAMSIZ];
557 int index;
558
559 /* Sorry... */
560 ret = -EPERM;
5e1fccc0 561 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 562 goto out;
563
564 ret = -EINVAL;
565 if (optlen < 0)
566 goto out;
567
568 /* Bind this socket to a particular device like "eth0",
569 * as specified in the passed interface name. If the
570 * name is "" or the option length is zero the socket
571 * is not bound.
572 */
573 if (optlen > IFNAMSIZ - 1)
574 optlen = IFNAMSIZ - 1;
575 memset(devname, 0, sizeof(devname));
576
577 ret = -EFAULT;
578 if (copy_from_user(devname, optval, optlen))
579 goto out;
580
000ba2e4
DM		 581 index = 0;
582 if (devname[0] != '\0') {
bf8e56bf 583 struct net_device *dev;
4878809f 584
bf8e56bf
ED		 585 rcu_read_lock();
586 dev = dev_get_by_name_rcu(net, devname);
587 if (dev)
588 index = dev->ifindex;
589 rcu_read_unlock();
4878809f
DM		 590 ret = -ENODEV;
591 if (!dev)
592 goto out;
4878809f
DM		 593 }
594
595 lock_sock(sk);
596 sk->sk_bound_dev_if = index;
597 sk_dst_reset(sk);
598 release_sock(sk);
599
600 ret = 0;
601
602out:
603#endif
604
605 return ret;
606}
607
c91f6df2
BH		 608static int sock_getbindtodevice(struct sock *sk, char __user *optval,
609 int __user *optlen, int len)
610{
611 int ret = -ENOPROTOOPT;
612#ifdef CONFIG_NETDEVICES
613 struct net *net = sock_net(sk);
c91f6df2 614 char devname[IFNAMSIZ];
c91f6df2
BH		 615
616 if (sk->sk_bound_dev_if == 0) {
617 len = 0;
618 goto zero;
619 }
620
621 ret = -EINVAL;
622 if (len < IFNAMSIZ)
623 goto out;
624
5dbe7c17
NS		 625 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
626 if (ret)
c91f6df2 627 goto out;
c91f6df2
BH		 628
629 len = strlen(devname) + 1;
630
631 ret = -EFAULT;
632 if (copy_to_user(optval, devname, len))
633 goto out;
634
635zero:
636 ret = -EFAULT;
637 if (put_user(len, optlen))
638 goto out;
639
640 ret = 0;
641
642out:
643#endif
644
645 return ret;
646}
647
c0ef877b
PE		 648static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
649{
650 if (valbool)
651 sock_set_flag(sk, bit);
652 else
653 sock_reset_flag(sk, bit);
654}
655
1da177e4
LT		 656/*
657 * This is meant for all protocols to use and covers goings on
658 * at the socket level. Everything here is generic.
659 */
660
661int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 662 char __user *optval, unsigned int optlen)
1da177e4 663{
2a91525c 664 struct sock *sk = sock->sk;
1da177e4
LT		 665 int val;
666 int valbool;
667 struct linger ling;
668 int ret = 0;
4ec93edb 669
1da177e4
LT		 670 /*
671 * Options without arguments
672 */
673
4878809f 674 if (optname == SO_BINDTODEVICE)
c91f6df2 675 return sock_setbindtodevice(sk, optval, optlen);
4878809f 676
e71a4783
SH		 677 if (optlen < sizeof(int))
678 return -EINVAL;
4ec93edb 679
1da177e4
LT		 680 if (get_user(val, (int __user *)optval))
681 return -EFAULT;
4ec93edb 682
2a91525c 683 valbool = val ? 1 : 0;
1da177e4
LT		 684
685 lock_sock(sk);
686
2a91525c 687 switch (optname) {
e71a4783 688 case SO_DEBUG:
2a91525c 689 if (val && !capable(CAP_NET_ADMIN))
e71a4783 690 ret = -EACCES;
2a91525c 691 else
c0ef877b 692 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 693 break;
694 case SO_REUSEADDR:
4a17fd52 695 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 696 break;
055dc21a
TH		 697 case SO_REUSEPORT:
698 sk->sk_reuseport = valbool;
699 break;
e71a4783 700 case SO_TYPE:
49c794e9 701 case SO_PROTOCOL:
0d6038ee 702 case SO_DOMAIN:
e71a4783
SH		 703 case SO_ERROR:
704 ret = -ENOPROTOOPT;
705 break;
706 case SO_DONTROUTE:
c0ef877b 707 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 708 break;
709 case SO_BROADCAST:
710 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
711 break;
712 case SO_SNDBUF:
713 /* Don't error on this BSD doesn't and if you think
82981930
ED		 714 * about it this is right. Otherwise apps have to
715 * play 'guess the biggest size' games. RCVBUF/SNDBUF
716 * are treated in BSD as hints
717 */
718 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 719set_sndbuf:
e71a4783 720 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 721 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
722 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 723 sk->sk_write_space(sk);
724 break;
1da177e4 725
e71a4783
SH		 726 case SO_SNDBUFFORCE:
727 if (!capable(CAP_NET_ADMIN)) {
728 ret = -EPERM;
729 break;
730 }
731 goto set_sndbuf;
b0573dea 732
e71a4783
SH		 733 case SO_RCVBUF:
734 /* Don't error on this BSD doesn't and if you think
82981930
ED		 735 * about it this is right. Otherwise apps have to
736 * play 'guess the biggest size' games. RCVBUF/SNDBUF
737 * are treated in BSD as hints
738 */
739 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 740set_rcvbuf:
e71a4783
SH		 741 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
742 /*
743 * We double it on the way in to account for
744 * "struct sk_buff" etc. overhead. Applications
745 * assume that the SO_RCVBUF setting they make will
746 * allow that much actual data to be received on that
747 * socket.
748 *
749 * Applications are unaware that "struct sk_buff" and
750 * other overheads allocate from the receive buffer
751 * during socket buffer allocation.
752 *
753 * And after considering the possible alternatives,
754 * returning the value we actually used in getsockopt
755 * is the most desirable behavior.
756 */
82981930 757 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 758 break;
759
760 case SO_RCVBUFFORCE:
761 if (!capable(CAP_NET_ADMIN)) {
762 ret = -EPERM;
1da177e4 763 break;
e71a4783
SH		 764 }
765 goto set_rcvbuf;
1da177e4 766
e71a4783 767 case SO_KEEPALIVE:
1da177e4 768#ifdef CONFIG_INET
3e10986d
ED		 769 if (sk->sk_protocol == IPPROTO_TCP &&
770 sk->sk_type == SOCK_STREAM)
e71a4783 771 tcp_set_keepalive(sk, valbool);
1da177e4 772#endif
e71a4783
SH		 773 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
774 break;
775
776 case SO_OOBINLINE:
777 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
778 break;
779
780 case SO_NO_CHECK:
28448b80 781 sk->sk_no_check_tx = valbool;
e71a4783
SH		 782 break;
783
784 case SO_PRIORITY:
5e1fccc0
EB		 785 if ((val >= 0 && val <= 6) ||
786 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 787 sk->sk_priority = val;
788 else
789 ret = -EPERM;
790 break;
791
792 case SO_LINGER:
793 if (optlen < sizeof(ling)) {
794 ret = -EINVAL; /* 1003.1g */
1da177e4 795 break;
e71a4783 796 }
2a91525c 797 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 798 ret = -EFAULT;
1da177e4 799 break;
e71a4783
SH		 800 }
801 if (!ling.l_onoff)
802 sock_reset_flag(sk, SOCK_LINGER);
803 else {
1da177e4 804#if (BITS_PER_LONG == 32)
e71a4783
SH		 805 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
806 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 807 else
e71a4783
SH		 808#endif
809 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
810 sock_set_flag(sk, SOCK_LINGER);
811 }
812 break;
813
814 case SO_BSDCOMPAT:
815 sock_warn_obsolete_bsdism("setsockopt");
816 break;
817
818 case SO_PASSCRED:
819 if (valbool)
820 set_bit(SOCK_PASSCRED, &sock->flags);
821 else
822 clear_bit(SOCK_PASSCRED, &sock->flags);
823 break;
824
825 case SO_TIMESTAMP:
92f37fd2 826 case SO_TIMESTAMPNS:
e71a4783 827 if (valbool) {
92f37fd2
ED		 828 if (optname == SO_TIMESTAMP)
829 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
830 else
831 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 832 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 833 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 834 } else {
e71a4783 835 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 836 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
837 }
e71a4783
SH		 838 break;
839
20d49473
PO		 840 case SO_TIMESTAMPING:
841 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 842 ret = -EINVAL;
20d49473
PO		 843 break;
844 }
b245be1f 845
09c2d251 846 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765
WB		 847 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
848 if (sk->sk_protocol == IPPROTO_TCP) {
849 if (sk->sk_state != TCP_ESTABLISHED) {
850 ret = -EINVAL;
851 break;
852 }
853 sk->sk_tskey = tcp_sk(sk)->snd_una;
854 } else {
855 sk->sk_tskey = 0;
856 }
857 }
b9f40e21 858 sk->sk_tsflags = val;
20d49473
PO		 859 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
860 sock_enable_timestamp(sk,
861 SOCK_TIMESTAMPING_RX_SOFTWARE);
862 else
863 sock_disable_timestamp(sk,
08e29af3 864 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 865 break;
866
e71a4783
SH		 867 case SO_RCVLOWAT:
868 if (val < 0)
869 val = INT_MAX;
870 sk->sk_rcvlowat = val ? : 1;
871 break;
872
873 case SO_RCVTIMEO:
874 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
875 break;
876
877 case SO_SNDTIMEO:
878 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
879 break;
1da177e4 880
e71a4783
SH		 881 case SO_ATTACH_FILTER:
882 ret = -EINVAL;
883 if (optlen == sizeof(struct sock_fprog)) {
884 struct sock_fprog fprog;
1da177e4 885
e71a4783
SH		 886 ret = -EFAULT;
887 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 888 break;
e71a4783
SH		 889
890 ret = sk_attach_filter(&fprog, sk);
891 }
892 break;
893
89aa0758
AS		 894 case SO_ATTACH_BPF:
895 ret = -EINVAL;
896 if (optlen == sizeof(u32)) {
897 u32 ufd;
898
899 ret = -EFAULT;
900 if (copy_from_user(&ufd, optval, sizeof(ufd)))
901 break;
902
903 ret = sk_attach_bpf(ufd, sk);
904 }
905 break;
906
e71a4783 907 case SO_DETACH_FILTER:
55b33325 908 ret = sk_detach_filter(sk);
e71a4783 909 break;
1da177e4 910
d59577b6
VB		 911 case SO_LOCK_FILTER:
912 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
913 ret = -EPERM;
914 else
915 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
916 break;
917
e71a4783
SH		 918 case SO_PASSSEC:
919 if (valbool)
920 set_bit(SOCK_PASSSEC, &sock->flags);
921 else
922 clear_bit(SOCK_PASSSEC, &sock->flags);
923 break;
4a19ec58 924 case SO_MARK:
5e1fccc0 925 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 926 ret = -EPERM;
2a91525c 927 else
4a19ec58 928 sk->sk_mark = val;
4a19ec58 929 break;
877ce7c1 930
3b885787 931 case SO_RXQ_OVFL:
8083f0fc 932 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 933 break;
6e3e939f
JB		 934
935 case SO_WIFI_STATUS:
936 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
937 break;
938
ef64a54f
PE		 939 case SO_PEEK_OFF:
940 if (sock->ops->set_peek_off)
12663bfc 941 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 942 else
943 ret = -EOPNOTSUPP;
944 break;
3bdc0eba
BG		 945
946 case SO_NOFCS:
947 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
948 break;
949
7d4c04fc
KJ		 950 case SO_SELECT_ERR_QUEUE:
951 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
952 break;
953
e0d1095a 954#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 955 case SO_BUSY_POLL:
dafcc438
ET		 956 /* allow unprivileged users to decrease the value */
957 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
958 ret = -EPERM;
959 else {
960 if (val < 0)
961 ret = -EINVAL;
962 else
963 sk->sk_ll_usec = val;
964 }
965 break;
966#endif
62748f32
ED		 967
968 case SO_MAX_PACING_RATE:
969 sk->sk_max_pacing_rate = val;
970 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
971 sk->sk_max_pacing_rate);
972 break;
973
e71a4783
SH		 974 default:
975 ret = -ENOPROTOOPT;
976 break;
4ec93edb 977 }
1da177e4
LT		 978 release_sock(sk);
979 return ret;
980}
2a91525c 981EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 982
983
8f09898b 984static void cred_to_ucred(struct pid *pid, const struct cred *cred,
985 struct ucred *ucred)
3f551f94
EB		 986{
987 ucred->pid = pid_vnr(pid);
988 ucred->uid = ucred->gid = -1;
989 if (cred) {
990 struct user_namespace *current_ns = current_user_ns();
991
b2e4f544
EB		 992 ucred->uid = from_kuid_munged(current_ns, cred->euid);
993 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 994 }
995}
996
1da177e4
LT		 997int sock_getsockopt(struct socket *sock, int level, int optname,
998 char __user *optval, int __user *optlen)
999{
1000 struct sock *sk = sock->sk;
4ec93edb 1001
e71a4783 1002 union {
4ec93edb
YH		 1003 int val;
1004 struct linger ling;
1da177e4
LT		 1005 struct timeval tm;
1006 } v;
4ec93edb 1007
4d0392be 1008 int lv = sizeof(int);
1da177e4 1009 int len;
4ec93edb 1010
e71a4783 1011 if (get_user(len, optlen))
4ec93edb 1012 return -EFAULT;
e71a4783 1013 if (len < 0)
1da177e4 1014 return -EINVAL;
4ec93edb 1015
50fee1de 1016 memset(&v, 0, sizeof(v));
df0bca04 1017
2a91525c 1018 switch (optname) {
e71a4783
SH		 1019 case SO_DEBUG:
1020 v.val = sock_flag(sk, SOCK_DBG);
1021 break;
1022
1023 case SO_DONTROUTE:
1024 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1025 break;
1026
1027 case SO_BROADCAST:
1b23a5df 1028 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1029 break;
1030
1031 case SO_SNDBUF:
1032 v.val = sk->sk_sndbuf;
1033 break;
1034
1035 case SO_RCVBUF:
1036 v.val = sk->sk_rcvbuf;
1037 break;
1038
1039 case SO_REUSEADDR:
1040 v.val = sk->sk_reuse;
1041 break;
1042
055dc21a
TH		 1043 case SO_REUSEPORT:
1044 v.val = sk->sk_reuseport;
1045 break;
1046
e71a4783 1047 case SO_KEEPALIVE:
1b23a5df 1048 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1049 break;
1050
1051 case SO_TYPE:
1052 v.val = sk->sk_type;
1053 break;
1054
49c794e9
JE		 1055 case SO_PROTOCOL:
1056 v.val = sk->sk_protocol;
1057 break;
1058
0d6038ee
JE		 1059 case SO_DOMAIN:
1060 v.val = sk->sk_family;
1061 break;
1062
e71a4783
SH		 1063 case SO_ERROR:
1064 v.val = -sock_error(sk);
2a91525c 1065 if (v.val == 0)
e71a4783
SH		 1066 v.val = xchg(&sk->sk_err_soft, 0);
1067 break;
1068
1069 case SO_OOBINLINE:
1b23a5df 1070 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1071 break;
1072
1073 case SO_NO_CHECK:
28448b80 1074 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1075 break;
1076
1077 case SO_PRIORITY:
1078 v.val = sk->sk_priority;
1079 break;
1080
1081 case SO_LINGER:
1082 lv = sizeof(v.ling);
1b23a5df 1083 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1084 v.ling.l_linger = sk->sk_lingertime / HZ;
1085 break;
1086
1087 case SO_BSDCOMPAT:
1088 sock_warn_obsolete_bsdism("getsockopt");
1089 break;
1090
1091 case SO_TIMESTAMP:
92f37fd2
ED		 1092 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1093 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1094 break;
1095
1096 case SO_TIMESTAMPNS:
1097 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1098 break;
1099
20d49473 1100 case SO_TIMESTAMPING:
b9f40e21 1101 v.val = sk->sk_tsflags;
20d49473
PO		 1102 break;
1103
e71a4783 1104 case SO_RCVTIMEO:
2a91525c 1105 lv = sizeof(struct timeval);
e71a4783
SH		 1106 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1107 v.tm.tv_sec = 0;
1108 v.tm.tv_usec = 0;
1109 } else {
1110 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1111 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1112 }
1113 break;
1114
1115 case SO_SNDTIMEO:
2a91525c 1116 lv = sizeof(struct timeval);
e71a4783
SH		 1117 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1118 v.tm.tv_sec = 0;
1119 v.tm.tv_usec = 0;
1120 } else {
1121 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1122 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1123 }
1124 break;
1da177e4 1125
e71a4783
SH		 1126 case SO_RCVLOWAT:
1127 v.val = sk->sk_rcvlowat;
1128 break;
1da177e4 1129
e71a4783 1130 case SO_SNDLOWAT:
2a91525c 1131 v.val = 1;
e71a4783 1132 break;
1da177e4 1133
e71a4783 1134 case SO_PASSCRED:
82981930 1135 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1136 break;
1da177e4 1137
e71a4783 1138 case SO_PEERCRED:
109f6e39
EB		 1139 {
1140 struct ucred peercred;
1141 if (len > sizeof(peercred))
1142 len = sizeof(peercred);
1143 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1144 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1145 return -EFAULT;
1146 goto lenout;
109f6e39 1147 }
1da177e4 1148
e71a4783
SH		 1149 case SO_PEERNAME:
1150 {
1151 char address[128];
1152
1153 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1154 return -ENOTCONN;
1155 if (lv < len)
1156 return -EINVAL;
1157 if (copy_to_user(optval, address, len))
1158 return -EFAULT;
1159 goto lenout;
1160 }
1da177e4 1161
e71a4783
SH		 1162 /* Dubious BSD thing... Probably nobody even uses it, but
1163 * the UNIX standard wants it for whatever reason... -DaveM
1164 */
1165 case SO_ACCEPTCONN:
1166 v.val = sk->sk_state == TCP_LISTEN;
1167 break;
1da177e4 1168
e71a4783 1169 case SO_PASSSEC:
82981930 1170 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1171 break;
877ce7c1 1172
e71a4783
SH		 1173 case SO_PEERSEC:
1174 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1175
4a19ec58
LAT		 1176 case SO_MARK:
1177 v.val = sk->sk_mark;
1178 break;
1179
3b885787 1180 case SO_RXQ_OVFL:
1b23a5df 1181 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1182 break;
1183
6e3e939f 1184 case SO_WIFI_STATUS:
1b23a5df 1185 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1186 break;
1187
ef64a54f
PE		 1188 case SO_PEEK_OFF:
1189 if (!sock->ops->set_peek_off)
1190 return -EOPNOTSUPP;
1191
1192 v.val = sk->sk_peek_off;
1193 break;
bc2f7996 1194 case SO_NOFCS:
1b23a5df 1195 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1196 break;
c91f6df2 1197
f7b86bfe 1198 case SO_BINDTODEVICE:
c91f6df2
BH		 1199 return sock_getbindtodevice(sk, optval, optlen, len);
1200
a8fc9277
PE		 1201 case SO_GET_FILTER:
1202 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1203 if (len < 0)
1204 return len;
1205
1206 goto lenout;
c91f6df2 1207
d59577b6
VB		 1208 case SO_LOCK_FILTER:
1209 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1210 break;
1211
ea02f941
MS		 1212 case SO_BPF_EXTENSIONS:
1213 v.val = bpf_tell_extensions();
1214 break;
1215
7d4c04fc
KJ		 1216 case SO_SELECT_ERR_QUEUE:
1217 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1218 break;
1219
e0d1095a 1220#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1221 case SO_BUSY_POLL:
dafcc438
ET		 1222 v.val = sk->sk_ll_usec;
1223 break;
1224#endif
1225
62748f32
ED		 1226 case SO_MAX_PACING_RATE:
1227 v.val = sk->sk_max_pacing_rate;
1228 break;
1229
2c8c56e1
ED		 1230 case SO_INCOMING_CPU:
1231 v.val = sk->sk_incoming_cpu;
1232 break;
1233
e71a4783 1234 default:
443b5991
YH		 1235 /* We implement the SO_SNDLOWAT etc to not be settable
1236 * (1003.1g 7).
1237 */
e71a4783 1238 return -ENOPROTOOPT;
1da177e4 1239 }
e71a4783 1240
1da177e4
LT		 1241 if (len > lv)
1242 len = lv;
1243 if (copy_to_user(optval, &v, len))
1244 return -EFAULT;
1245lenout:
4ec93edb
YH		 1246 if (put_user(len, optlen))
1247 return -EFAULT;
1248 return 0;
1da177e4
LT		 1249}
1250
a5b5bb9a
IM		 1251/*
1252 * Initialize an sk_lock.
1253 *
1254 * (We also register the sk_lock with the lock validator.)
1255 */
b6f99a21 1256static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1257{
ed07536e
PZ		 1258 sock_lock_init_class_and_name(sk,
1259 af_family_slock_key_strings[sk->sk_family],
1260 af_family_slock_keys + sk->sk_family,
1261 af_family_key_strings[sk->sk_family],
1262 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1263}
1264
4dc6dc71
ED		 1265/*
1266 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1267 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1268 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1269 */
f1a6c4da
PE		 1270static void sock_copy(struct sock *nsk, const struct sock *osk)
1271{
1272#ifdef CONFIG_SECURITY_NETWORK
1273 void *sptr = nsk->sk_security;
1274#endif
68835aba
ED		 1275 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1276
1277 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1278 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1279
f1a6c4da
PE		 1280#ifdef CONFIG_SECURITY_NETWORK
1281 nsk->sk_security = sptr;
1282 security_sk_clone(osk, nsk);
1283#endif
1284}
1285
fcbdf09d
OP		 1286void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1287{
1288 unsigned long nulls1, nulls2;
1289
1290 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1291 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1292 if (nulls1 > nulls2)
1293 swap(nulls1, nulls2);
1294
1295 if (nulls1 != 0)
1296 memset((char *)sk, 0, nulls1);
1297 memset((char *)sk + nulls1 + sizeof(void *), 0,
1298 nulls2 - nulls1 - sizeof(void *));
1299 memset((char *)sk + nulls2 + sizeof(void *), 0,
1300 size - nulls2 - sizeof(void *));
1301}
1302EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1303
2e4afe7b
PE		 1304static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1305 int family)
c308c1b2
PE		 1306{
1307 struct sock *sk;
1308 struct kmem_cache *slab;
1309
1310 slab = prot->slab;
e912b114
ED		 1311 if (slab != NULL) {
1312 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1313 if (!sk)
1314 return sk;
1315 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1316 if (prot->clear_sk)
1317 prot->clear_sk(sk, prot->obj_size);
1318 else
1319 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1320 }
fcbdf09d 1321 } else
c308c1b2
PE		 1322 sk = kmalloc(prot->obj_size, priority);
1323
2e4afe7b 1324 if (sk != NULL) {
a98b65a3
VN		 1325 kmemcheck_annotate_bitfield(sk, flags);
1326
2e4afe7b
PE		 1327 if (security_sk_alloc(sk, family, priority))
1328 goto out_free;
1329
1330 if (!try_module_get(prot->owner))
1331 goto out_free_sec;
e022f0b4 1332 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1333 }
1334
c308c1b2 1335 return sk;
2e4afe7b
PE		 1336
1337out_free_sec:
1338 security_sk_free(sk);
1339out_free:
1340 if (slab != NULL)
1341 kmem_cache_free(slab, sk);
1342 else
1343 kfree(sk);
1344 return NULL;
c308c1b2
PE		 1345}
1346
1347static void sk_prot_free(struct proto *prot, struct sock *sk)
1348{
1349 struct kmem_cache *slab;
2e4afe7b 1350 struct module *owner;
c308c1b2 1351
2e4afe7b 1352 owner = prot->owner;
c308c1b2 1353 slab = prot->slab;
2e4afe7b
PE		 1354
1355 security_sk_free(sk);
c308c1b2
PE		 1356 if (slab != NULL)
1357 kmem_cache_free(slab, sk);
1358 else
1359 kfree(sk);
2e4afe7b 1360 module_put(owner);
c308c1b2
PE		 1361}
1362
86f8515f 1363#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
6ffd4641 1364void sock_update_netprioidx(struct sock *sk)
5bc1421e 1365{
5bc1421e
NH		 1366 if (in_interrupt())
1367 return;
2b73bc65 1368
6ffd4641 1369 sk->sk_cgrp_prioidx = task_netprioidx(current);
5bc1421e
NH		 1370}
1371EXPORT_SYMBOL_GPL(sock_update_netprioidx);
f8451725
HX		 1372#endif
1373
1da177e4
LT		 1374/**
1375 * sk_alloc - All socket objects are allocated here
c4ea43c5 1376 * @net: the applicable net namespace
4dc3b16b
PP		 1377 * @family: protocol family
1378 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1379 * @prot: struct proto associated with this new sock instance
1da177e4 1380 */
1b8d7ae4 1381struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1382 struct proto *prot)
1da177e4 1383{
c308c1b2 1384 struct sock *sk;
1da177e4 1385
154adbc8 1386 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1387 if (sk) {
154adbc8
PE		 1388 sk->sk_family = family;
1389 /*
1390 * See comment in struct sock definition to understand
1391 * why we need sk_prot_creator -acme
1392 */
1393 sk->sk_prot = sk->sk_prot_creator = prot;
1394 sock_lock_init(sk);
3b1e0a65 1395 sock_net_set(sk, get_net(net));
d66ee058 1396 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1397
211d2f97 1398 sock_update_classid(sk);
6ffd4641 1399 sock_update_netprioidx(sk);
1da177e4 1400 }
a79af59e 1401
2e4afe7b 1402 return sk;
1da177e4 1403}
2a91525c 1404EXPORT_SYMBOL(sk_alloc);
1da177e4 1405
2b85a34e 1406static void __sk_free(struct sock *sk)
1da177e4
LT		 1407{
1408 struct sk_filter *filter;
1da177e4
LT		 1409
1410 if (sk->sk_destruct)
1411 sk->sk_destruct(sk);
1412
a898def2
PM		 1413 filter = rcu_dereference_check(sk->sk_filter,
1414 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1415 if (filter) {
309dd5fc 1416 sk_filter_uncharge(sk, filter);
a9b3cd7f 1417 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1418 }
1419
08e29af3 1420 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1421
1422 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1423 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1424 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1425
109f6e39
EB		 1426 if (sk->sk_peer_cred)
1427 put_cred(sk->sk_peer_cred);
1428 put_pid(sk->sk_peer_pid);
3b1e0a65 1429 put_net(sock_net(sk));
c308c1b2 1430 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1431}
2b85a34e
ED		 1432
1433void sk_free(struct sock *sk)
1434{
1435 /*
25985edc 1436 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1437 * some packets are still in some tx queue.
1438 * If not null, sock_wfree() will call __sk_free(sk) later
1439 */
1440 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1441 __sk_free(sk);
1442}
2a91525c 1443EXPORT_SYMBOL(sk_free);
1da177e4 1444
edf02087 1445/*
25985edc
LDM		 1446 * Last sock_put should drop reference to sk->sk_net. It has already
1447 * been dropped in sk_change_net. Taking reference to stopping namespace
edf02087 1448 * is not an option.
25985edc 1449 * Take reference to a socket to remove it from hash _alive_ and after that
edf02087
DL		 1450 * destroy it in the context of init_net.
1451 */
1452void sk_release_kernel(struct sock *sk)
1453{
1454 if (sk == NULL || sk->sk_socket == NULL)
1455 return;
1456
1457 sock_hold(sk);
3b1e0a65 1458 sock_net_set(sk, get_net(&init_net));
c243d7e2 1459 sock_release(sk->sk_socket);
edf02087
DL		 1460 sock_put(sk);
1461}
45af1754 1462EXPORT_SYMBOL(sk_release_kernel);
edf02087 1463
475f1b52
SR		 1464static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1465{
1466 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1467 sock_update_memcg(newsk);
1468}
1469
e56c57d0
ED		 1470/**
1471 * sk_clone_lock - clone a socket, and lock its clone
1472 * @sk: the socket to clone
1473 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1474 *
1475 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1476 */
1477struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1478{
8fd1d178 1479 struct sock *newsk;
278571ba 1480 bool is_charged = true;
87d11ceb 1481
8fd1d178 1482 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1483 if (newsk != NULL) {
1484 struct sk_filter *filter;
1485
892c141e 1486 sock_copy(newsk, sk);
87d11ceb
ACM		 1487
1488 /* SANITY */
3b1e0a65 1489 get_net(sock_net(newsk));
87d11ceb
ACM		 1490 sk_node_init(&newsk->sk_node);
1491 sock_lock_init(newsk);
1492 bh_lock_sock(newsk);
fa438ccf 1493 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1494 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1495
1496 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1497 /*
1498 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1499 */
1500 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1501 atomic_set(&newsk->sk_omem_alloc, 0);
1502 skb_queue_head_init(&newsk->sk_receive_queue);
1503 skb_queue_head_init(&newsk->sk_write_queue);
1504
b6c6712a 1505 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1506 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1507 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1508 af_callback_keys + newsk->sk_family,
1509 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1510
1511 newsk->sk_dst_cache = NULL;
1512 newsk->sk_wmem_queued = 0;
1513 newsk->sk_forward_alloc = 0;
1514 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1515 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1516
1517 sock_reset_flag(newsk, SOCK_DONE);
1518 skb_queue_head_init(&newsk->sk_error_queue);
1519
0d7da9dd 1520 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb 1521 if (filter != NULL)
278571ba
AS		 1522 /* though it's an empty new sock, the charging may fail
1523 * if sysctl_optmem_max was changed between creation of
1524 * original socket and cloning
1525 */
1526 is_charged = sk_filter_charge(newsk, filter);
87d11ceb 1527
278571ba 1528 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk))) {
87d11ceb
ACM		 1529 /* It is still raw copy of parent, so invalidate
1530 * destructor and make plain sk_free() */
1531 newsk->sk_destruct = NULL;
b0691c8e 1532 bh_unlock_sock(newsk);
87d11ceb
ACM		 1533 sk_free(newsk);
1534 newsk = NULL;
1535 goto out;
1536 }
1537
1538 newsk->sk_err = 0;
1539 newsk->sk_priority = 0;
2c8c56e1 1540 newsk->sk_incoming_cpu = raw_smp_processor_id();
33cf7c90 1541 atomic64_set(&newsk->sk_cookie, 0);
4dc6dc71
ED		 1542 /*
1543 * Before updating sk_refcnt, we must commit prior changes to memory
1544 * (Documentation/RCU/rculist_nulls.txt for details)
1545 */
1546 smp_wmb();
87d11ceb
ACM		 1547 atomic_set(&newsk->sk_refcnt, 2);
1548
1549 /*
1550 * Increment the counter in the same struct proto as the master
1551 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1552 * is the same as sk->sk_prot->socks, as this field was copied
1553 * with memcpy).
1554 *
1555 * This _changes_ the previous behaviour, where
1556 * tcp_create_openreq_child always was incrementing the
1557 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1558 * to be taken into account in all callers. -acme
1559 */
1560 sk_refcnt_debug_inc(newsk);
972692e0 1561 sk_set_socket(newsk, NULL);
43815482 1562 newsk->sk_wq = NULL;
87d11ceb 1563
f3f511e1
GC		 1564 sk_update_clone(sk, newsk);
1565
87d11ceb 1566 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1567 sk_sockets_allocated_inc(newsk);
704da560 1568
08e29af3 1569 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1570 net_enable_timestamp();
87d11ceb
ACM		 1571 }
1572out:
1573 return newsk;
1574}
e56c57d0 1575EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1576
9958089a
AK		 1577void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1578{
1579 __sk_dst_set(sk, dst);
1580 sk->sk_route_caps = dst->dev->features;
1581 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1582 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1583 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1584 if (sk_can_gso(sk)) {
82cc1a7a 1585 if (dst->header_len) {
9958089a 1586 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1587 } else {
9958089a 1588 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1589 sk->sk_gso_max_size = dst->dev->gso_max_size;
1485348d 1590 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
82cc1a7a 1591 }
9958089a
AK		 1592 }
1593}
1594EXPORT_SYMBOL_GPL(sk_setup_caps);
1595
1da177e4
LT		 1596/*
1597 * Simple resource managers for sockets.
1598 */
1599
1600
4ec93edb
YH		 1601/*
1602 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1603 */
1604void sock_wfree(struct sk_buff *skb)
1605{
1606 struct sock *sk = skb->sk;
d99927f4 1607 unsigned int len = skb->truesize;
1da177e4 1608
d99927f4
ED		 1609 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1610 /*
1611 * Keep a reference on sk_wmem_alloc, this will be released
1612 * after sk_write_space() call
1613 */
1614 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1615 sk->sk_write_space(sk);
d99927f4
ED		 1616 len = 1;
1617 }
2b85a34e 1618 /*
d99927f4
ED		 1619 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1620 * could not do because of in-flight packets
2b85a34e 1621 */
d99927f4 1622 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1623 __sk_free(sk);
1da177e4 1624}
2a91525c 1625EXPORT_SYMBOL(sock_wfree);
1da177e4 1626
f2f872f9
ED		 1627void skb_orphan_partial(struct sk_buff *skb)
1628{
1629 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1630 * so we do not completely orphan skb, but transfert all
1631 * accounted bytes but one, to avoid unexpected reorders.
1632 */
1633 if (skb->destructor == sock_wfree
1634#ifdef CONFIG_INET
1635 || skb->destructor == tcp_wfree
1636#endif
1637 ) {
1638 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1639 skb->truesize = 1;
1640 } else {
1641 skb_orphan(skb);
1642 }
1643}
1644EXPORT_SYMBOL(skb_orphan_partial);
1645
4ec93edb
YH		 1646/*
1647 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1648 */
1649void sock_rfree(struct sk_buff *skb)
1650{
1651 struct sock *sk = skb->sk;
d361fd59 1652 unsigned int len = skb->truesize;
1da177e4 1653
d361fd59
ED		 1654 atomic_sub(len, &sk->sk_rmem_alloc);
1655 sk_mem_uncharge(sk, len);
1da177e4 1656}
2a91525c 1657EXPORT_SYMBOL(sock_rfree);
1da177e4 1658
7768eed8
OH		 1659/*
1660 * Buffer destructor for skbs that are not used directly in read or write
1661 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1662 */
62bccb8c
AD		 1663void sock_efree(struct sk_buff *skb)
1664{
1665 sock_put(skb->sk);
1666}
1667EXPORT_SYMBOL(sock_efree);
1668
976d0201 1669kuid_t sock_i_uid(struct sock *sk)
1da177e4 1670{
976d0201 1671 kuid_t uid;
1da177e4 1672
f064af1e 1673 read_lock_bh(&sk->sk_callback_lock);
976d0201 1674 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1675 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1676 return uid;
1677}
2a91525c 1678EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1679
1680unsigned long sock_i_ino(struct sock *sk)
1681{
1682 unsigned long ino;
1683
f064af1e 1684 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1685 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1686 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1687 return ino;
1688}
2a91525c 1689EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1690
1691/*
1692 * Allocate a skb from the socket's send buffer.
1693 */
86a76caf 1694struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1695 gfp_t priority)
1da177e4
LT		 1696{
1697 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1698 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1699 if (skb) {
1700 skb_set_owner_w(skb, sk);
1701 return skb;
1702 }
1703 }
1704 return NULL;
1705}
2a91525c 1706EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1707
4ec93edb 1708/*
1da177e4 1709 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1710 */
dd0fc66f 1711void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1712{
95c96174 1713 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1714 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1715 void *mem;
1716 /* First do the add, to avoid the race if kmalloc
4ec93edb 1717 * might sleep.
1da177e4
LT		 1718 */
1719 atomic_add(size, &sk->sk_omem_alloc);
1720 mem = kmalloc(size, priority);
1721 if (mem)
1722 return mem;
1723 atomic_sub(size, &sk->sk_omem_alloc);
1724 }
1725 return NULL;
1726}
2a91525c 1727EXPORT_SYMBOL(sock_kmalloc);
1da177e4 1728
79e88659
DB		 1729/* Free an option memory block. Note, we actually want the inline
1730 * here as this allows gcc to detect the nullify and fold away the
1731 * condition entirely.
1da177e4 1732 */
79e88659
DB		 1733static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1734 const bool nullify)
1da177e4 1735{
e53da5fb
DM		 1736 if (WARN_ON_ONCE(!mem))
1737 return;
79e88659
DB		 1738 if (nullify)
1739 kzfree(mem);
1740 else
1741 kfree(mem);
1da177e4
LT		 1742 atomic_sub(size, &sk->sk_omem_alloc);
1743}
79e88659
DB		 1744
1745void sock_kfree_s(struct sock *sk, void *mem, int size)
1746{
1747 __sock_kfree_s(sk, mem, size, false);
1748}
2a91525c 1749EXPORT_SYMBOL(sock_kfree_s);
1da177e4 1750
79e88659
DB		 1751void sock_kzfree_s(struct sock *sk, void *mem, int size)
1752{
1753 __sock_kfree_s(sk, mem, size, true);
1754}
1755EXPORT_SYMBOL(sock_kzfree_s);
1756
1da177e4
LT		 1757/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1758 I think, these locks should be removed for datagram sockets.
1759 */
2a91525c 1760static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1761{
1762 DEFINE_WAIT(wait);
1763
1764 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1765 for (;;) {
1766 if (!timeo)
1767 break;
1768 if (signal_pending(current))
1769 break;
1770 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1771 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1772 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1773 break;
1774 if (sk->sk_shutdown & SEND_SHUTDOWN)
1775 break;
1776 if (sk->sk_err)
1777 break;
1778 timeo = schedule_timeout(timeo);
1779 }
aa395145 1780 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1781 return timeo;
1782}
1783
1784
1785/*
1786 * Generic send/receive buffer handlers
1787 */
1788
4cc7f68d
HX		 1789struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1790 unsigned long data_len, int noblock,
28d64271 1791 int *errcode, int max_page_order)
1da177e4 1792{
2e4e4410 1793 struct sk_buff *skb;
1da177e4
LT		 1794 long timeo;
1795 int err;
1796
1da177e4 1797 timeo = sock_sndtimeo(sk, noblock);
2e4e4410 1798 for (;;) {
1da177e4
LT		 1799 err = sock_error(sk);
1800 if (err != 0)
1801 goto failure;
1802
1803 err = -EPIPE;
1804 if (sk->sk_shutdown & SEND_SHUTDOWN)
1805 goto failure;
1806
2e4e4410
ED		 1807 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
1808 break;
28d64271 1809
2e4e4410
ED		 1810 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1811 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1812 err = -EAGAIN;
1813 if (!timeo)
1da177e4 1814 goto failure;
2e4e4410
ED		 1815 if (signal_pending(current))
1816 goto interrupted;
1817 timeo = sock_wait_for_wmem(sk, timeo);
1da177e4 1818 }
2e4e4410
ED		 1819 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
1820 errcode, sk->sk_allocation);
1821 if (skb)
1822 skb_set_owner_w(skb, sk);
1da177e4
LT		 1823 return skb;
1824
1825interrupted:
1826 err = sock_intr_errno(timeo);
1827failure:
1828 *errcode = err;
1829 return NULL;
1830}
4cc7f68d 1831EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1832
4ec93edb 1833struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1834 int noblock, int *errcode)
1835{
28d64271 1836 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1837}
2a91525c 1838EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1839
5640f768
ED		 1840/* On 32bit arches, an skb frag is limited to 2^15 */
1841#define SKB_FRAG_PAGE_ORDER get_order(32768)
1842
400dfd3a
ED		 1843/**
1844 * skb_page_frag_refill - check that a page_frag contains enough room
1845 * @sz: minimum size of the fragment we want to get
1846 * @pfrag: pointer to page_frag
82d5e2b8 1847 * @gfp: priority for memory allocation
400dfd3a
ED		 1848 *
1849 * Note: While this allocator tries to use high order pages, there is
1850 * no guarantee that allocations succeed. Therefore, @sz MUST be
1851 * less or equal than PAGE_SIZE.
1852 */
d9b2938a 1853bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 1854{
5640f768
ED		 1855 if (pfrag->page) {
1856 if (atomic_read(&pfrag->page->_count) == 1) {
1857 pfrag->offset = 0;
1858 return true;
1859 }
400dfd3a 1860 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1861 return true;
1862 put_page(pfrag->page);
1863 }
1864
d9b2938a
ED		 1865 pfrag->offset = 0;
1866 if (SKB_FRAG_PAGE_ORDER) {
1867 pfrag->page = alloc_pages(gfp | __GFP_COMP |
1868 __GFP_NOWARN | __GFP_NORETRY,
1869 SKB_FRAG_PAGE_ORDER);
5640f768 1870 if (likely(pfrag->page)) {
d9b2938a 1871 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 1872 return true;
1873 }
d9b2938a
ED		 1874 }
1875 pfrag->page = alloc_page(gfp);
1876 if (likely(pfrag->page)) {
1877 pfrag->size = PAGE_SIZE;
1878 return true;
1879 }
400dfd3a
ED		 1880 return false;
1881}
1882EXPORT_SYMBOL(skb_page_frag_refill);
1883
1884bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1885{
1886 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1887 return true;
1888
5640f768
ED		 1889 sk_enter_memory_pressure(sk);
1890 sk_stream_moderate_sndbuf(sk);
1891 return false;
1892}
1893EXPORT_SYMBOL(sk_page_frag_refill);
1894
1da177e4 1895static void __lock_sock(struct sock *sk)
f39234d6
NK		 1896 __releases(&sk->sk_lock.slock)
1897 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1898{
1899 DEFINE_WAIT(wait);
1900
e71a4783 1901 for (;;) {
1da177e4
LT		 1902 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1903 TASK_UNINTERRUPTIBLE);
1904 spin_unlock_bh(&sk->sk_lock.slock);
1905 schedule();
1906 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1907 if (!sock_owned_by_user(sk))
1da177e4
LT		 1908 break;
1909 }
1910 finish_wait(&sk->sk_lock.wq, &wait);
1911}
1912
1913static void __release_sock(struct sock *sk)
f39234d6
NK		 1914 __releases(&sk->sk_lock.slock)
1915 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1916{
1917 struct sk_buff *skb = sk->sk_backlog.head;
1918
1919 do {
1920 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1921 bh_unlock_sock(sk);
1922
1923 do {
1924 struct sk_buff *next = skb->next;
1925
e4cbb02a 1926 prefetch(next);
7fee226a 1927 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1928 skb->next = NULL;
c57943a1 1929 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1930
1931 /*
1932 * We are in process context here with softirqs
1933 * disabled, use cond_resched_softirq() to preempt.
1934 * This is safe to do because we've taken the backlog
1935 * queue private:
1936 */
1937 cond_resched_softirq();
1938
1939 skb = next;
1940 } while (skb != NULL);
1941
1942 bh_lock_sock(sk);
e71a4783 1943 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1944
1945 /*
1946 * Doing the zeroing here guarantee we can not loop forever
1947 * while a wild producer attempts to flood us.
1948 */
1949 sk->sk_backlog.len = 0;
1da177e4
LT		 1950}
1951
1952/**
1953 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1954 * @sk: sock to wait on
1955 * @timeo: for how long
1da177e4
LT		 1956 *
1957 * Now socket state including sk->sk_err is changed only under lock,
1958 * hence we may omit checks after joining wait queue.
1959 * We check receive queue before schedule() only as optimization;
1960 * it is very likely that release_sock() added new data.
1961 */
1962int sk_wait_data(struct sock *sk, long *timeo)
1963{
1964 int rc;
1965 DEFINE_WAIT(wait);
1966
aa395145 1967 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1968 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1969 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1970 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1971 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1972 return rc;
1973}
1da177e4
LT		 1974EXPORT_SYMBOL(sk_wait_data);
1975
3ab224be
HA		 1976/**
1977 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1978 * @sk: socket
1979 * @size: memory size to allocate
1980 * @kind: allocation type
1981 *
1982 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1983 * rmem allocation. This function assumes that protocols which have
1984 * memory_pressure use sk_wmem_queued as write buffer accounting.
1985 */
1986int __sk_mem_schedule(struct sock *sk, int size, int kind)
1987{
1988 struct proto *prot = sk->sk_prot;
1989 int amt = sk_mem_pages(size);
8d987e5c 1990 long allocated;
e1aab161 1991 int parent_status = UNDER_LIMIT;
3ab224be
HA		 1992
1993 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 1994
e1aab161 1995 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 1996
1997 /* Under limit. */
e1aab161
GC		 1998 if (parent_status == UNDER_LIMIT &&
1999 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2000 sk_leave_memory_pressure(sk);
3ab224be
HA		 2001 return 1;
2002 }
2003
e1aab161
GC		 2004 /* Under pressure. (we or our parents) */
2005 if ((parent_status > SOFT_LIMIT) ||
2006 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2007 sk_enter_memory_pressure(sk);
3ab224be 2008
e1aab161
GC		 2009 /* Over hard limit (we or our parents) */
2010 if ((parent_status == OVER_LIMIT) ||
2011 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 2012 goto suppress_allocation;
2013
2014 /* guarantee minimum buffer size under pressure */
2015 if (kind == SK_MEM_RECV) {
2016 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2017 return 1;
180d8cd9 2018
3ab224be
HA		 2019 } else { /* SK_MEM_SEND */
2020 if (sk->sk_type == SOCK_STREAM) {
2021 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2022 return 1;
2023 } else if (atomic_read(&sk->sk_wmem_alloc) <
2024 prot->sysctl_wmem[0])
2025 return 1;
2026 }
2027
180d8cd9 2028 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2029 int alloc;
2030
180d8cd9 2031 if (!sk_under_memory_pressure(sk))
1748376b 2032 return 1;
180d8cd9
GC		 2033 alloc = sk_sockets_allocated_read_positive(sk);
2034 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2035 sk_mem_pages(sk->sk_wmem_queued +
2036 atomic_read(&sk->sk_rmem_alloc) +
2037 sk->sk_forward_alloc))
2038 return 1;
2039 }
2040
2041suppress_allocation:
2042
2043 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2044 sk_stream_moderate_sndbuf(sk);
2045
2046 /* Fail only if socket is _under_ its sndbuf.
2047 * In this case we cannot block, so that we have to fail.
2048 */
2049 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2050 return 1;
2051 }
2052
3847ce32
SM		 2053 trace_sock_exceed_buf_limit(sk, prot, allocated);
2054
3ab224be
HA		 2055 /* Alas. Undo changes. */
2056 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2057
0e90b31f 2058 sk_memory_allocated_sub(sk, amt);
180d8cd9 2059
3ab224be
HA		 2060 return 0;
2061}
3ab224be
HA		 2062EXPORT_SYMBOL(__sk_mem_schedule);
2063
2064/**
2065 * __sk_reclaim - reclaim memory_allocated
2066 * @sk: socket
2067 */
2068void __sk_mem_reclaim(struct sock *sk)
2069{
180d8cd9 2070 sk_memory_allocated_sub(sk,
0e90b31f 2071 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
3ab224be
HA		 2072 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
2073
180d8cd9
GC		 2074 if (sk_under_memory_pressure(sk) &&
2075 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2076 sk_leave_memory_pressure(sk);
3ab224be 2077}
3ab224be
HA		 2078EXPORT_SYMBOL(__sk_mem_reclaim);
2079
2080
1da177e4
LT		 2081/*
2082 * Set of default routines for initialising struct proto_ops when
2083 * the protocol does not support a particular function. In certain
2084 * cases where it makes no sense for a protocol to have a "do nothing"
2085 * function, some default processing is provided.
2086 */
2087
2088int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2089{
2090 return -EOPNOTSUPP;
2091}
2a91525c 2092EXPORT_SYMBOL(sock_no_bind);
1da177e4 2093
4ec93edb 2094int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2095 int len, int flags)
2096{
2097 return -EOPNOTSUPP;
2098}
2a91525c 2099EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2100
2101int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2102{
2103 return -EOPNOTSUPP;
2104}
2a91525c 2105EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2106
2107int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2108{
2109 return -EOPNOTSUPP;
2110}
2a91525c 2111EXPORT_SYMBOL(sock_no_accept);
1da177e4 2112
4ec93edb 2113int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2114 int *len, int peer)
2115{
2116 return -EOPNOTSUPP;
2117}
2a91525c 2118EXPORT_SYMBOL(sock_no_getname);
1da177e4 2119
2a91525c 2120unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2121{
2122 return 0;
2123}
2a91525c 2124EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2125
2126int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2127{
2128 return -EOPNOTSUPP;
2129}
2a91525c 2130EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2131
2132int sock_no_listen(struct socket *sock, int backlog)
2133{
2134 return -EOPNOTSUPP;
2135}
2a91525c 2136EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2137
2138int sock_no_shutdown(struct socket *sock, int how)
2139{
2140 return -EOPNOTSUPP;
2141}
2a91525c 2142EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2143
2144int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2145 char __user *optval, unsigned int optlen)
1da177e4
LT		 2146{
2147 return -EOPNOTSUPP;
2148}
2a91525c 2149EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2150
2151int sock_no_getsockopt(struct socket *sock, int level, int optname,
2152 char __user *optval, int __user *optlen)
2153{
2154 return -EOPNOTSUPP;
2155}
2a91525c 2156EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4 2157
1b784140 2158int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
1da177e4
LT		 2159{
2160 return -EOPNOTSUPP;
2161}
2a91525c 2162EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4 2163
1b784140
YX		 2164int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2165 int flags)
1da177e4
LT		 2166{
2167 return -EOPNOTSUPP;
2168}
2a91525c 2169EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2170
2171int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2172{
2173 /* Mirror missing mmap method error code */
2174 return -ENODEV;
2175}
2a91525c 2176EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2177
2178ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2179{
2180 ssize_t res;
2181 struct msghdr msg = {.msg_flags = flags};
2182 struct kvec iov;
2183 char *kaddr = kmap(page);
2184 iov.iov_base = kaddr + offset;
2185 iov.iov_len = size;
2186 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2187 kunmap(page);
2188 return res;
2189}
2a91525c 2190EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2191
2192/*
2193 * Default Socket Callbacks
2194 */
2195
2196static void sock_def_wakeup(struct sock *sk)
2197{
43815482
ED		 2198 struct socket_wq *wq;
2199
2200 rcu_read_lock();
2201 wq = rcu_dereference(sk->sk_wq);
2202 if (wq_has_sleeper(wq))
2203 wake_up_interruptible_all(&wq->wait);
2204 rcu_read_unlock();
1da177e4
LT		 2205}
2206
2207static void sock_def_error_report(struct sock *sk)
2208{
43815482
ED		 2209 struct socket_wq *wq;
2210
2211 rcu_read_lock();
2212 wq = rcu_dereference(sk->sk_wq);
2213 if (wq_has_sleeper(wq))
2214 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2215 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2216 rcu_read_unlock();
1da177e4
LT		 2217}
2218
676d2369 2219static void sock_def_readable(struct sock *sk)
1da177e4 2220{
43815482
ED		 2221 struct socket_wq *wq;
2222
2223 rcu_read_lock();
2224 wq = rcu_dereference(sk->sk_wq);
2225 if (wq_has_sleeper(wq))
2c6607c6 2226 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2227 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2228 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2229 rcu_read_unlock();
1da177e4
LT		 2230}
2231
2232static void sock_def_write_space(struct sock *sk)
2233{
43815482
ED		 2234 struct socket_wq *wq;
2235
2236 rcu_read_lock();
1da177e4
LT		 2237
2238 /* Do not wake up a writer until he can make "significant"
2239 * progress. --DaveM
2240 */
e71a4783 2241 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2242 wq = rcu_dereference(sk->sk_wq);
2243 if (wq_has_sleeper(wq))
2244 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2245 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2246
2247 /* Should agree with poll, otherwise some programs break */
2248 if (sock_writeable(sk))
8d8ad9d7 2249 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2250 }
2251
43815482 2252 rcu_read_unlock();
1da177e4
LT		 2253}
2254
2255static void sock_def_destruct(struct sock *sk)
2256{
a51482bd 2257 kfree(sk->sk_protinfo);
1da177e4
LT		 2258}
2259
2260void sk_send_sigurg(struct sock *sk)
2261{
2262 if (sk->sk_socket && sk->sk_socket->file)
2263 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2264 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2265}
2a91525c 2266EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2267
2268void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2269 unsigned long expires)
2270{
2271 if (!mod_timer(timer, expires))
2272 sock_hold(sk);
2273}
1da177e4
LT		 2274EXPORT_SYMBOL(sk_reset_timer);
2275
2276void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2277{
25cc4ae9 2278 if (del_timer(timer))
1da177e4
LT		 2279 __sock_put(sk);
2280}
1da177e4
LT		 2281EXPORT_SYMBOL(sk_stop_timer);
2282
2283void sock_init_data(struct socket *sock, struct sock *sk)
2284{
2285 skb_queue_head_init(&sk->sk_receive_queue);
2286 skb_queue_head_init(&sk->sk_write_queue);
2287 skb_queue_head_init(&sk->sk_error_queue);
2288
2289 sk->sk_send_head = NULL;
2290
2291 init_timer(&sk->sk_timer);
4ec93edb 2292
1da177e4
LT		 2293 sk->sk_allocation = GFP_KERNEL;
2294 sk->sk_rcvbuf = sysctl_rmem_default;
2295 sk->sk_sndbuf = sysctl_wmem_default;
2296 sk->sk_state = TCP_CLOSE;
972692e0 2297 sk_set_socket(sk, sock);
1da177e4
LT		 2298
2299 sock_set_flag(sk, SOCK_ZAPPED);
2300
e71a4783 2301 if (sock) {
1da177e4 2302 sk->sk_type = sock->type;
43815482 2303 sk->sk_wq = sock->wq;
1da177e4
LT		 2304 sock->sk = sk;
2305 } else
43815482 2306 sk->sk_wq = NULL;
1da177e4 2307
b6c6712a 2308 spin_lock_init(&sk->sk_dst_lock);
1da177e4 2309 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2310 lockdep_set_class_and_name(&sk->sk_callback_lock,
2311 af_callback_keys + sk->sk_family,
2312 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2313
2314 sk->sk_state_change = sock_def_wakeup;
2315 sk->sk_data_ready = sock_def_readable;
2316 sk->sk_write_space = sock_def_write_space;
2317 sk->sk_error_report = sock_def_error_report;
2318 sk->sk_destruct = sock_def_destruct;
2319
5640f768
ED		 2320 sk->sk_frag.page = NULL;
2321 sk->sk_frag.offset = 0;
ef64a54f 2322 sk->sk_peek_off = -1;
1da177e4 2323
109f6e39
EB		 2324 sk->sk_peer_pid = NULL;
2325 sk->sk_peer_cred = NULL;
1da177e4
LT		 2326 sk->sk_write_pending = 0;
2327 sk->sk_rcvlowat = 1;
2328 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2329 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2330
f37f0afb 2331 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2332
e0d1095a 2333#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2334 sk->sk_napi_id = 0;
64b0dc51 2335 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2336#endif
2337
62748f32 2338 sk->sk_max_pacing_rate = ~0U;
7eec4174 2339 sk->sk_pacing_rate = ~0U;
4dc6dc71
ED		 2340 /*
2341 * Before updating sk_refcnt, we must commit prior changes to memory
2342 * (Documentation/RCU/rculist_nulls.txt for details)
2343 */
2344 smp_wmb();
1da177e4 2345 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2346 atomic_set(&sk->sk_drops, 0);
1da177e4 2347}
2a91525c 2348EXPORT_SYMBOL(sock_init_data);
1da177e4 2349
b5606c2d 2350void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2351{
2352 might_sleep();
a5b5bb9a 2353 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2354 if (sk->sk_lock.owned)
1da177e4 2355 __lock_sock(sk);
d2e9117c 2356 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2357 spin_unlock(&sk->sk_lock.slock);
2358 /*
2359 * The sk_lock has mutex_lock() semantics here:
2360 */
fcc70d5f 2361 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2362 local_bh_enable();
1da177e4 2363}
fcc70d5f 2364EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2365
b5606c2d 2366void release_sock(struct sock *sk)
1da177e4 2367{
a5b5bb9a
IM		 2368 /*
2369 * The sk_lock has mutex_unlock() semantics:
2370 */
2371 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2372
2373 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2374 if (sk->sk_backlog.tail)
2375 __release_sock(sk);
46d3ceab 2376
c3f9b018
ED		 2377 /* Warning : release_cb() might need to release sk ownership,
2378 * ie call sock_release_ownership(sk) before us.
2379 */
46d3ceab
ED		 2380 if (sk->sk_prot->release_cb)
2381 sk->sk_prot->release_cb(sk);
2382
c3f9b018 2383 sock_release_ownership(sk);
a5b5bb9a
IM		 2384 if (waitqueue_active(&sk->sk_lock.wq))
2385 wake_up(&sk->sk_lock.wq);
2386 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2387}
2388EXPORT_SYMBOL(release_sock);
2389
8a74ad60
ED		 2390/**
2391 * lock_sock_fast - fast version of lock_sock
2392 * @sk: socket
2393 *
2394 * This version should be used for very small section, where process wont block
2395 * return false if fast path is taken
2396 * sk_lock.slock locked, owned = 0, BH disabled
2397 * return true if slow path is taken
2398 * sk_lock.slock unlocked, owned = 1, BH enabled
2399 */
2400bool lock_sock_fast(struct sock *sk)
2401{
2402 might_sleep();
2403 spin_lock_bh(&sk->sk_lock.slock);
2404
2405 if (!sk->sk_lock.owned)
2406 /*
2407 * Note : We must disable BH
2408 */
2409 return false;
2410
2411 __lock_sock(sk);
2412 sk->sk_lock.owned = 1;
2413 spin_unlock(&sk->sk_lock.slock);
2414 /*
2415 * The sk_lock has mutex_lock() semantics here:
2416 */
2417 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2418 local_bh_enable();
2419 return true;
2420}
2421EXPORT_SYMBOL(lock_sock_fast);
2422
1da177e4 2423int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2424{
b7aa0bf7 2425 struct timeval tv;
1da177e4 2426 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2427 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2428 tv = ktime_to_timeval(sk->sk_stamp);
2429 if (tv.tv_sec == -1)
1da177e4 2430 return -ENOENT;
b7aa0bf7
ED		 2431 if (tv.tv_sec == 0) {
2432 sk->sk_stamp = ktime_get_real();
2433 tv = ktime_to_timeval(sk->sk_stamp);
2434 }
2435 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2436}
1da177e4
LT		 2437EXPORT_SYMBOL(sock_get_timestamp);
2438
ae40eb1e
ED		 2439int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2440{
2441 struct timespec ts;
2442 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2443 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2444 ts = ktime_to_timespec(sk->sk_stamp);
2445 if (ts.tv_sec == -1)
2446 return -ENOENT;
2447 if (ts.tv_sec == 0) {
2448 sk->sk_stamp = ktime_get_real();
2449 ts = ktime_to_timespec(sk->sk_stamp);
2450 }
2451 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2452}
2453EXPORT_SYMBOL(sock_get_timestampns);
2454
20d49473 2455void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2456{
20d49473 2457 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2458 unsigned long previous_flags = sk->sk_flags;
2459
20d49473
PO		 2460 sock_set_flag(sk, flag);
2461 /*
2462 * we just set one of the two flags which require net
2463 * time stamping, but time stamping might have been on
2464 * already because of the other one
2465 */
08e29af3 2466 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2467 net_enable_timestamp();
1da177e4
LT		 2468 }
2469}
1da177e4 2470
cb820f8e
RC		 2471int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2472 int level, int type)
2473{
2474 struct sock_exterr_skb *serr;
364a9e93 2475 struct sk_buff *skb;
cb820f8e
RC		 2476 int copied, err;
2477
2478 err = -EAGAIN;
364a9e93 2479 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 2480 if (skb == NULL)
2481 goto out;
2482
2483 copied = skb->len;
2484 if (copied > len) {
2485 msg->msg_flags |= MSG_TRUNC;
2486 copied = len;
2487 }
51f3d02b 2488 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 2489 if (err)
2490 goto out_free_skb;
2491
2492 sock_recv_timestamp(msg, sk, skb);
2493
2494 serr = SKB_EXT_ERR(skb);
2495 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2496
2497 msg->msg_flags |= MSG_ERRQUEUE;
2498 err = copied;
2499
cb820f8e
RC		 2500out_free_skb:
2501 kfree_skb(skb);
2502out:
2503 return err;
2504}
2505EXPORT_SYMBOL(sock_recv_errqueue);
2506
1da177e4
LT		 2507/*
2508 * Get a socket option on an socket.
2509 *
2510 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2511 * asynchronous errors should be reported by getsockopt. We assume
2512 * this means if you specify SO_ERROR (otherwise whats the point of it).
2513 */
2514int sock_common_getsockopt(struct socket *sock, int level, int optname,
2515 char __user *optval, int __user *optlen)
2516{
2517 struct sock *sk = sock->sk;
2518
2519 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2520}
1da177e4
LT		 2521EXPORT_SYMBOL(sock_common_getsockopt);
2522
3fdadf7d 2523#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2524int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2525 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2526{
2527 struct sock *sk = sock->sk;
2528
1e51f951 2529 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2530 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2531 optval, optlen);
3fdadf7d
DM		 2532 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2533}
2534EXPORT_SYMBOL(compat_sock_common_getsockopt);
2535#endif
2536
1b784140
YX		 2537int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2538 int flags)
1da177e4
LT		 2539{
2540 struct sock *sk = sock->sk;
2541 int addr_len = 0;
2542 int err;
2543
1b784140 2544 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
1da177e4
LT		 2545 flags & ~MSG_DONTWAIT, &addr_len);
2546 if (err >= 0)
2547 msg->msg_namelen = addr_len;
2548 return err;
2549}
1da177e4
LT		 2550EXPORT_SYMBOL(sock_common_recvmsg);
2551
2552/*
2553 * Set socket options on an inet socket.
2554 */
2555int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2556 char __user *optval, unsigned int optlen)
1da177e4
LT		 2557{
2558 struct sock *sk = sock->sk;
2559
2560 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2561}
1da177e4
LT		 2562EXPORT_SYMBOL(sock_common_setsockopt);
2563
3fdadf7d 2564#ifdef CONFIG_COMPAT
543d9cfe 2565int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2566 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2567{
2568 struct sock *sk = sock->sk;
2569
543d9cfe
ACM		 2570 if (sk->sk_prot->compat_setsockopt != NULL)
2571 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2572 optval, optlen);
3fdadf7d
DM		 2573 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2574}
2575EXPORT_SYMBOL(compat_sock_common_setsockopt);
2576#endif
2577
1da177e4
LT		 2578void sk_common_release(struct sock *sk)
2579{
2580 if (sk->sk_prot->destroy)
2581 sk->sk_prot->destroy(sk);
2582
2583 /*
2584 * Observation: when sock_common_release is called, processes have
2585 * no access to socket. But net still has.
2586 * Step one, detach it from networking:
2587 *
2588 * A. Remove from hash tables.
2589 */
2590
2591 sk->sk_prot->unhash(sk);
2592
2593 /*
2594 * In this point socket cannot receive new packets, but it is possible
2595 * that some packets are in flight because some CPU runs receiver and
2596 * did hash table lookup before we unhashed socket. They will achieve
2597 * receive queue and will be purged by socket destructor.
2598 *
2599 * Also we still have packets pending on receive queue and probably,
2600 * our own packets waiting in device queues. sock_destroy will drain
2601 * receive queue, but transmitted packets will delay socket destruction
2602 * until the last reference will be released.
2603 */
2604
2605 sock_orphan(sk);
2606
2607 xfrm_sk_free_policy(sk);
2608
e6848976 2609 sk_refcnt_debug_release(sk);
5640f768
ED		 2610
2611 if (sk->sk_frag.page) {
2612 put_page(sk->sk_frag.page);
2613 sk->sk_frag.page = NULL;
2614 }
2615
1da177e4
LT		 2616 sock_put(sk);
2617}
1da177e4
LT		 2618EXPORT_SYMBOL(sk_common_release);
2619
13ff3d6f
PE		 2620#ifdef CONFIG_PROC_FS
2621#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2622struct prot_inuse {
2623 int val[PROTO_INUSE_NR];
2624};
13ff3d6f
PE		 2625
2626static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2627
2628#ifdef CONFIG_NET_NS
2629void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2630{
d6d9ca0f 2631 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2632}
2633EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2634
2635int sock_prot_inuse_get(struct net *net, struct proto *prot)
2636{
2637 int cpu, idx = prot->inuse_idx;
2638 int res = 0;
2639
2640 for_each_possible_cpu(cpu)
2641 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2642
2643 return res >= 0 ? res : 0;
2644}
2645EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2646
2c8c1e72 2647static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2648{
2649 net->core.inuse = alloc_percpu(struct prot_inuse);
2650 return net->core.inuse ? 0 : -ENOMEM;
2651}
2652
2c8c1e72 2653static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2654{
2655 free_percpu(net->core.inuse);
2656}
2657
2658static struct pernet_operations net_inuse_ops = {
2659 .init = sock_inuse_init_net,
2660 .exit = sock_inuse_exit_net,
2661};
2662
2663static __init int net_inuse_init(void)
2664{
2665 if (register_pernet_subsys(&net_inuse_ops))
2666 panic("Cannot initialize net inuse counters");
2667
2668 return 0;
2669}
2670
2671core_initcall(net_inuse_init);
2672#else
1338d466
PE		 2673static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2674
c29a0bc4 2675void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2676{
d6d9ca0f 2677 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2678}
2679EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2680
c29a0bc4 2681int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2682{
2683 int cpu, idx = prot->inuse_idx;
2684 int res = 0;
2685
2686 for_each_possible_cpu(cpu)
2687 res += per_cpu(prot_inuse, cpu).val[idx];
2688
2689 return res >= 0 ? res : 0;
2690}
2691EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2692#endif
13ff3d6f
PE		 2693
2694static void assign_proto_idx(struct proto *prot)
2695{
2696 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2697
2698 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2699 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2700 return;
2701 }
2702
2703 set_bit(prot->inuse_idx, proto_inuse_idx);
2704}
2705
2706static void release_proto_idx(struct proto *prot)
2707{
2708 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2709 clear_bit(prot->inuse_idx, proto_inuse_idx);
2710}
2711#else
2712static inline void assign_proto_idx(struct proto *prot)
2713{
2714}
2715
2716static inline void release_proto_idx(struct proto *prot)
2717{
2718}
2719#endif
2720
0159dfd3
ED		 2721static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
2722{
2723 if (!rsk_prot)
2724 return;
2725 kfree(rsk_prot->slab_name);
2726 rsk_prot->slab_name = NULL;
2727 if (rsk_prot->slab) {
2728 kmem_cache_destroy(rsk_prot->slab);
2729 rsk_prot->slab = NULL;
2730 }
2731}
2732
2733static int req_prot_init(const struct proto *prot)
2734{
2735 struct request_sock_ops *rsk_prot = prot->rsk_prot;
2736
2737 if (!rsk_prot)
2738 return 0;
2739
2740 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
2741 prot->name);
2742 if (!rsk_prot->slab_name)
2743 return -ENOMEM;
2744
2745 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
2746 rsk_prot->obj_size, 0,
fa76ce73 2747 0, NULL);
0159dfd3
ED		 2748
2749 if (!rsk_prot->slab) {
2750 pr_crit("%s: Can't create request sock SLAB cache!\n",
2751 prot->name);
2752 return -ENOMEM;
2753 }
2754 return 0;
2755}
2756
b733c007
PE		 2757int proto_register(struct proto *prot, int alloc_slab)
2758{
1da177e4
LT		 2759 if (alloc_slab) {
2760 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2761 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2762 NULL);
1da177e4
LT		 2763
2764 if (prot->slab == NULL) {
e005d193
JP		 2765 pr_crit("%s: Can't create sock SLAB cache!\n",
2766 prot->name);
60e7663d 2767 goto out;
1da177e4 2768 }
2e6599cb 2769
0159dfd3
ED		 2770 if (req_prot_init(prot))
2771 goto out_free_request_sock_slab;
8feaf0c0 2772
6d6ee43e 2773 if (prot->twsk_prot != NULL) {
faf23422 2774 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2775
7e56b5d6 2776 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2777 goto out_free_request_sock_slab;
2778
6d6ee43e 2779 prot->twsk_prot->twsk_slab =
7e56b5d6 2780 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2781 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2782 0,
2783 SLAB_HWCACHE_ALIGN |
2784 prot->slab_flags,
20c2df83 2785 NULL);
6d6ee43e 2786 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2787 goto out_free_timewait_sock_slab_name;
2788 }
1da177e4
LT		 2789 }
2790
36b77a52 2791 mutex_lock(&proto_list_mutex);
1da177e4 2792 list_add(&prot->node, &proto_list);
13ff3d6f 2793 assign_proto_idx(prot);
36b77a52 2794 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2795 return 0;
2796
8feaf0c0 2797out_free_timewait_sock_slab_name:
7e56b5d6 2798 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0 2799out_free_request_sock_slab:
0159dfd3
ED		 2800 req_prot_cleanup(prot->rsk_prot);
2801
2e6599cb
ACM		 2802 kmem_cache_destroy(prot->slab);
2803 prot->slab = NULL;
b733c007
PE		 2804out:
2805 return -ENOBUFS;
1da177e4 2806}
1da177e4
LT		 2807EXPORT_SYMBOL(proto_register);
2808
2809void proto_unregister(struct proto *prot)
2810{
36b77a52 2811 mutex_lock(&proto_list_mutex);
13ff3d6f 2812 release_proto_idx(prot);
0a3f4358 2813 list_del(&prot->node);
36b77a52 2814 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2815
2816 if (prot->slab != NULL) {
2817 kmem_cache_destroy(prot->slab);
2818 prot->slab = NULL;
2819 }
2820
0159dfd3 2821 req_prot_cleanup(prot->rsk_prot);
2e6599cb 2822
6d6ee43e 2823 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2824 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2825 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2826 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2827 }
1da177e4 2828}
1da177e4
LT		 2829EXPORT_SYMBOL(proto_unregister);
2830
2831#ifdef CONFIG_PROC_FS
1da177e4 2832static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2833 __acquires(proto_list_mutex)
1da177e4 2834{
36b77a52 2835 mutex_lock(&proto_list_mutex);
60f0438a 2836 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2837}
2838
2839static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2840{
60f0438a 2841 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2842}
2843
2844static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2845 __releases(proto_list_mutex)
1da177e4 2846{
36b77a52 2847 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2848}
2849
2850static char proto_method_implemented(const void *method)
2851{
2852 return method == NULL ? 'n' : 'y';
2853}
180d8cd9
GC		 2854static long sock_prot_memory_allocated(struct proto *proto)
2855{
cb75a36c 2856 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2857}
2858
2859static char *sock_prot_memory_pressure(struct proto *proto)
2860{
2861 return proto->memory_pressure != NULL ?
2862 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2863}
1da177e4
LT		 2864
2865static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2866{
180d8cd9 2867
8d987e5c 2868 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2869 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2870 proto->name,
2871 proto->obj_size,
14e943db 2872 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2873 sock_prot_memory_allocated(proto),
2874 sock_prot_memory_pressure(proto),
1da177e4
LT		 2875 proto->max_header,
2876 proto->slab == NULL ? "no" : "yes",
2877 module_name(proto->owner),
2878 proto_method_implemented(proto->close),
2879 proto_method_implemented(proto->connect),
2880 proto_method_implemented(proto->disconnect),
2881 proto_method_implemented(proto->accept),
2882 proto_method_implemented(proto->ioctl),
2883 proto_method_implemented(proto->init),
2884 proto_method_implemented(proto->destroy),
2885 proto_method_implemented(proto->shutdown),
2886 proto_method_implemented(proto->setsockopt),
2887 proto_method_implemented(proto->getsockopt),
2888 proto_method_implemented(proto->sendmsg),
2889 proto_method_implemented(proto->recvmsg),
2890 proto_method_implemented(proto->sendpage),
2891 proto_method_implemented(proto->bind),
2892 proto_method_implemented(proto->backlog_rcv),
2893 proto_method_implemented(proto->hash),
2894 proto_method_implemented(proto->unhash),
2895 proto_method_implemented(proto->get_port),
2896 proto_method_implemented(proto->enter_memory_pressure));
2897}
2898
2899static int proto_seq_show(struct seq_file *seq, void *v)
2900{
60f0438a 2901 if (v == &proto_list)
1da177e4
LT		 2902 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2903 "protocol",
2904 "size",
2905 "sockets",
2906 "memory",
2907 "press",
2908 "maxhdr",
2909 "slab",
2910 "module",
2911 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2912 else
60f0438a 2913 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2914 return 0;
2915}
2916
f690808e 2917static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2918 .start = proto_seq_start,
2919 .next = proto_seq_next,
2920 .stop = proto_seq_stop,
2921 .show = proto_seq_show,
2922};
2923
2924static int proto_seq_open(struct inode *inode, struct file *file)
2925{
14e943db
ED		 2926 return seq_open_net(inode, file, &proto_seq_ops,
2927 sizeof(struct seq_net_private));
1da177e4
LT		 2928}
2929
9a32144e 2930static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2931 .owner = THIS_MODULE,
2932 .open = proto_seq_open,
2933 .read = seq_read,
2934 .llseek = seq_lseek,
14e943db
ED		 2935 .release = seq_release_net,
2936};
2937
2938static __net_init int proto_init_net(struct net *net)
2939{
d4beaa66 2940 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 2941 return -ENOMEM;
2942
2943 return 0;
2944}
2945
2946static __net_exit void proto_exit_net(struct net *net)
2947{
ece31ffd 2948 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 2949}
2950
2951
2952static __net_initdata struct pernet_operations proto_net_ops = {
2953 .init = proto_init_net,
2954 .exit = proto_exit_net,
1da177e4
LT		 2955};
2956
2957static int __init proto_init(void)
2958{
14e943db 2959 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2960}
2961
2962subsys_initcall(proto_init);
2963
2964#endif /* PROC_FS */
Linux kernel - Deliverables
This page took 1.049972 seconds and 5 git commands to generate.