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Merge tag 'xtensa-for-next-20140815' into for_next
[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
169 * @cap: The global capbility to use
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 *
186 * Test to see if the opener of the socket had when the socke was created
187 * and the current process has the capability @cap over the network namespace
188 * the socket is a member of.
189 */
190bool sk_net_capable(const struct sock *sk, int cap)
191{
192 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
193}
194EXPORT_SYMBOL(sk_net_capable);
195
196
c255a458 197#ifdef CONFIG_MEMCG_KMEM
1d62e436 198int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
d1a4c0b3
GC		 199{
200 struct proto *proto;
201 int ret = 0;
202
36b77a52 203 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 204 list_for_each_entry(proto, &proto_list, node) {
205 if (proto->init_cgroup) {
1d62e436 206 ret = proto->init_cgroup(memcg, ss);
d1a4c0b3
GC		 207 if (ret)
208 goto out;
209 }
210 }
211
36b77a52 212 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 213 return ret;
214out:
215 list_for_each_entry_continue_reverse(proto, &proto_list, node)
216 if (proto->destroy_cgroup)
1d62e436 217 proto->destroy_cgroup(memcg);
36b77a52 218 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 219 return ret;
220}
221
1d62e436 222void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
d1a4c0b3
GC		 223{
224 struct proto *proto;
225
36b77a52 226 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 227 list_for_each_entry_reverse(proto, &proto_list, node)
228 if (proto->destroy_cgroup)
1d62e436 229 proto->destroy_cgroup(memcg);
36b77a52 230 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 231}
232#endif
233
da21f24d
IM		 234/*
235 * Each address family might have different locking rules, so we have
236 * one slock key per address family:
237 */
a5b5bb9a
IM		 238static struct lock_class_key af_family_keys[AF_MAX];
239static struct lock_class_key af_family_slock_keys[AF_MAX];
240
cbda4eaf 241#if defined(CONFIG_MEMCG_KMEM)
c5905afb 242struct static_key memcg_socket_limit_enabled;
e1aab161 243EXPORT_SYMBOL(memcg_socket_limit_enabled);
cbda4eaf 244#endif
e1aab161 245
a5b5bb9a
IM		 246/*
247 * Make lock validator output more readable. (we pre-construct these
248 * strings build-time, so that runtime initialization of socket
249 * locks is fast):
250 */
36cbd3dc 251static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 252 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
253 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
254 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
255 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
256 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
257 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
258 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 259 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 260 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 261 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 262 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 263 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 264 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
456db6a4 265 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX"
a5b5bb9a 266};
36cbd3dc 267static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 268 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
269 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
270 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
271 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
272 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
273 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
274 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 275 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 276 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 277 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 278 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 279 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 280 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
456db6a4 281 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX"
a5b5bb9a 282};
36cbd3dc 283static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 284 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
285 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
286 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
287 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
288 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
289 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
290 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 291 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 292 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 293 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 294 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 295 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 296 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
456db6a4 297 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX"
443aef0e 298};
da21f24d
IM		 299
300/*
301 * sk_callback_lock locking rules are per-address-family,
302 * so split the lock classes by using a per-AF key:
303 */
304static struct lock_class_key af_callback_keys[AF_MAX];
305
1da177e4
LT		 306/* Take into consideration the size of the struct sk_buff overhead in the
307 * determination of these values, since that is non-constant across
308 * platforms. This makes socket queueing behavior and performance
309 * not depend upon such differences.
310 */
311#define _SK_MEM_PACKETS 256
87fb4b7b 312#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 313#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
314#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
315
316/* Run time adjustable parameters. */
ab32ea5d 317__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 318EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 319__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 320EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 321__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
322__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 323
25985edc 324/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 325int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 326EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 327
c93bdd0e
MG		 328struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
329EXPORT_SYMBOL_GPL(memalloc_socks);
330
7cb02404
MG		 331/**
332 * sk_set_memalloc - sets %SOCK_MEMALLOC
333 * @sk: socket to set it on
334 *
335 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
336 * It's the responsibility of the admin to adjust min_free_kbytes
337 * to meet the requirements
338 */
339void sk_set_memalloc(struct sock *sk)
340{
341 sock_set_flag(sk, SOCK_MEMALLOC);
342 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 343 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 344}
345EXPORT_SYMBOL_GPL(sk_set_memalloc);
346
347void sk_clear_memalloc(struct sock *sk)
348{
349 sock_reset_flag(sk, SOCK_MEMALLOC);
350 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 351 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 352
353 /*
354 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
355 * progress of swapping. However, if SOCK_MEMALLOC is cleared while
356 * it has rmem allocations there is a risk that the user of the
357 * socket cannot make forward progress due to exceeding the rmem
358 * limits. By rights, sk_clear_memalloc() should only be called
359 * on sockets being torn down but warn and reset the accounting if
360 * that assumption breaks.
361 */
362 if (WARN_ON(sk->sk_forward_alloc))
363 sk_mem_reclaim(sk);
7cb02404
MG		 364}
365EXPORT_SYMBOL_GPL(sk_clear_memalloc);
366
b4b9e355
MG		 367int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
368{
369 int ret;
370 unsigned long pflags = current->flags;
371
372 /* these should have been dropped before queueing */
373 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
374
375 current->flags |= PF_MEMALLOC;
376 ret = sk->sk_backlog_rcv(sk, skb);
377 tsk_restore_flags(current, pflags, PF_MEMALLOC);
378
379 return ret;
380}
381EXPORT_SYMBOL(__sk_backlog_rcv);
382
1da177e4
LT		 383static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
384{
385 struct timeval tv;
386
387 if (optlen < sizeof(tv))
388 return -EINVAL;
389 if (copy_from_user(&tv, optval, sizeof(tv)))
390 return -EFAULT;
ba78073e
VA		 391 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
392 return -EDOM;
1da177e4 393
ba78073e 394 if (tv.tv_sec < 0) {
6f11df83
AM		 395 static int warned __read_mostly;
396
ba78073e 397 *timeo_p = 0;
50aab54f 398 if (warned < 10 && net_ratelimit()) {
ba78073e 399 warned++;
e005d193
JP		 400 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
401 __func__, current->comm, task_pid_nr(current));
50aab54f 402 }
ba78073e
VA		 403 return 0;
404 }
1da177e4
LT		 405 *timeo_p = MAX_SCHEDULE_TIMEOUT;
406 if (tv.tv_sec == 0 && tv.tv_usec == 0)
407 return 0;
408 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
409 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
410 return 0;
411}
412
413static void sock_warn_obsolete_bsdism(const char *name)
414{
415 static int warned;
416 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 417 if (strcmp(warncomm, current->comm) && warned < 5) {
418 strcpy(warncomm, current->comm);
e005d193
JP		 419 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
420 warncomm, name);
1da177e4
LT		 421 warned++;
422 }
423}
424
08e29af3
ED		 425#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
426
427static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 428{
08e29af3
ED		 429 if (sk->sk_flags & flags) {
430 sk->sk_flags &= ~flags;
431 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 432 net_disable_timestamp();
1da177e4
LT		 433 }
434}
435
436
f0088a50
DV		 437int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
438{
766e9037 439 int err;
f0088a50 440 int skb_len;
3b885787
NH		 441 unsigned long flags;
442 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 443
0fd7bac6 444 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 445 atomic_inc(&sk->sk_drops);
3847ce32 446 trace_sock_rcvqueue_full(sk, skb);
766e9037 447 return -ENOMEM;
f0088a50
DV		 448 }
449
fda9ef5d 450 err = sk_filter(sk, skb);
f0088a50 451 if (err)
766e9037 452 return err;
f0088a50 453
c76562b6 454 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 455 atomic_inc(&sk->sk_drops);
456 return -ENOBUFS;
3ab224be
HA		 457 }
458
f0088a50
DV		 459 skb->dev = NULL;
460 skb_set_owner_r(skb, sk);
49ad9599 461
f0088a50
DV		 462 /* Cache the SKB length before we tack it onto the receive
463 * queue. Once it is added it no longer belongs to us and
464 * may be freed by other threads of control pulling packets
465 * from the queue.
466 */
467 skb_len = skb->len;
468
7fee226a
ED		 469 /* we escape from rcu protected region, make sure we dont leak
470 * a norefcounted dst
471 */
472 skb_dst_force(skb);
473
3b885787
NH		 474 spin_lock_irqsave(&list->lock, flags);
475 skb->dropcount = atomic_read(&sk->sk_drops);
476 __skb_queue_tail(list, skb);
477 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 478
479 if (!sock_flag(sk, SOCK_DEAD))
676d2369 480 sk->sk_data_ready(sk);
766e9037 481 return 0;
f0088a50
DV		 482}
483EXPORT_SYMBOL(sock_queue_rcv_skb);
484
58a5a7b9 485int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 486{
487 int rc = NET_RX_SUCCESS;
488
fda9ef5d 489 if (sk_filter(sk, skb))
f0088a50
DV		 490 goto discard_and_relse;
491
492 skb->dev = NULL;
493
274f482d 494 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 495 atomic_inc(&sk->sk_drops);
496 goto discard_and_relse;
497 }
58a5a7b9
ACM		 498 if (nested)
499 bh_lock_sock_nested(sk);
500 else
501 bh_lock_sock(sk);
a5b5bb9a
IM		 502 if (!sock_owned_by_user(sk)) {
503 /*
504 * trylock + unlock semantics:
505 */
506 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
507
c57943a1 508 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 509
510 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 511 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 512 bh_unlock_sock(sk);
513 atomic_inc(&sk->sk_drops);
514 goto discard_and_relse;
515 }
516
f0088a50
DV		 517 bh_unlock_sock(sk);
518out:
519 sock_put(sk);
520 return rc;
521discard_and_relse:
522 kfree_skb(skb);
523 goto out;
524}
525EXPORT_SYMBOL(sk_receive_skb);
526
527struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
528{
b6c6712a 529 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 530
531 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 532 sk_tx_queue_clear(sk);
a9b3cd7f 533 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 534 dst_release(dst);
535 return NULL;
536 }
537
538 return dst;
539}
540EXPORT_SYMBOL(__sk_dst_check);
541
542struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
543{
544 struct dst_entry *dst = sk_dst_get(sk);
545
546 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
547 sk_dst_reset(sk);
548 dst_release(dst);
549 return NULL;
550 }
551
552 return dst;
553}
554EXPORT_SYMBOL(sk_dst_check);
555
c91f6df2
BH		 556static int sock_setbindtodevice(struct sock *sk, char __user *optval,
557 int optlen)
4878809f
DM		 558{
559 int ret = -ENOPROTOOPT;
560#ifdef CONFIG_NETDEVICES
3b1e0a65 561 struct net *net = sock_net(sk);
4878809f
DM		 562 char devname[IFNAMSIZ];
563 int index;
564
565 /* Sorry... */
566 ret = -EPERM;
5e1fccc0 567 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 568 goto out;
569
570 ret = -EINVAL;
571 if (optlen < 0)
572 goto out;
573
574 /* Bind this socket to a particular device like "eth0",
575 * as specified in the passed interface name. If the
576 * name is "" or the option length is zero the socket
577 * is not bound.
578 */
579 if (optlen > IFNAMSIZ - 1)
580 optlen = IFNAMSIZ - 1;
581 memset(devname, 0, sizeof(devname));
582
583 ret = -EFAULT;
584 if (copy_from_user(devname, optval, optlen))
585 goto out;
586
000ba2e4
DM		 587 index = 0;
588 if (devname[0] != '\0') {
bf8e56bf 589 struct net_device *dev;
4878809f 590
bf8e56bf
ED		 591 rcu_read_lock();
592 dev = dev_get_by_name_rcu(net, devname);
593 if (dev)
594 index = dev->ifindex;
595 rcu_read_unlock();
4878809f
DM		 596 ret = -ENODEV;
597 if (!dev)
598 goto out;
4878809f
DM		 599 }
600
601 lock_sock(sk);
602 sk->sk_bound_dev_if = index;
603 sk_dst_reset(sk);
604 release_sock(sk);
605
606 ret = 0;
607
608out:
609#endif
610
611 return ret;
612}
613
c91f6df2
BH		 614static int sock_getbindtodevice(struct sock *sk, char __user *optval,
615 int __user *optlen, int len)
616{
617 int ret = -ENOPROTOOPT;
618#ifdef CONFIG_NETDEVICES
619 struct net *net = sock_net(sk);
c91f6df2 620 char devname[IFNAMSIZ];
c91f6df2
BH		 621
622 if (sk->sk_bound_dev_if == 0) {
623 len = 0;
624 goto zero;
625 }
626
627 ret = -EINVAL;
628 if (len < IFNAMSIZ)
629 goto out;
630
5dbe7c17
NS		 631 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
632 if (ret)
c91f6df2 633 goto out;
c91f6df2
BH		 634
635 len = strlen(devname) + 1;
636
637 ret = -EFAULT;
638 if (copy_to_user(optval, devname, len))
639 goto out;
640
641zero:
642 ret = -EFAULT;
643 if (put_user(len, optlen))
644 goto out;
645
646 ret = 0;
647
648out:
649#endif
650
651 return ret;
652}
653
c0ef877b
PE		 654static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
655{
656 if (valbool)
657 sock_set_flag(sk, bit);
658 else
659 sock_reset_flag(sk, bit);
660}
661
1da177e4
LT		 662/*
663 * This is meant for all protocols to use and covers goings on
664 * at the socket level. Everything here is generic.
665 */
666
667int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 668 char __user *optval, unsigned int optlen)
1da177e4 669{
2a91525c 670 struct sock *sk = sock->sk;
1da177e4
LT		 671 int val;
672 int valbool;
673 struct linger ling;
674 int ret = 0;
4ec93edb 675
1da177e4
LT		 676 /*
677 * Options without arguments
678 */
679
4878809f 680 if (optname == SO_BINDTODEVICE)
c91f6df2 681 return sock_setbindtodevice(sk, optval, optlen);
4878809f 682
e71a4783
SH		 683 if (optlen < sizeof(int))
684 return -EINVAL;
4ec93edb 685
1da177e4
LT		 686 if (get_user(val, (int __user *)optval))
687 return -EFAULT;
4ec93edb 688
2a91525c 689 valbool = val ? 1 : 0;
1da177e4
LT		 690
691 lock_sock(sk);
692
2a91525c 693 switch (optname) {
e71a4783 694 case SO_DEBUG:
2a91525c 695 if (val && !capable(CAP_NET_ADMIN))
e71a4783 696 ret = -EACCES;
2a91525c 697 else
c0ef877b 698 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 699 break;
700 case SO_REUSEADDR:
4a17fd52 701 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 702 break;
055dc21a
TH		 703 case SO_REUSEPORT:
704 sk->sk_reuseport = valbool;
705 break;
e71a4783 706 case SO_TYPE:
49c794e9 707 case SO_PROTOCOL:
0d6038ee 708 case SO_DOMAIN:
e71a4783
SH		 709 case SO_ERROR:
710 ret = -ENOPROTOOPT;
711 break;
712 case SO_DONTROUTE:
c0ef877b 713 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 714 break;
715 case SO_BROADCAST:
716 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
717 break;
718 case SO_SNDBUF:
719 /* Don't error on this BSD doesn't and if you think
82981930
ED		 720 * about it this is right. Otherwise apps have to
721 * play 'guess the biggest size' games. RCVBUF/SNDBUF
722 * are treated in BSD as hints
723 */
724 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 725set_sndbuf:
e71a4783 726 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 727 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
728 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 729 sk->sk_write_space(sk);
730 break;
1da177e4 731
e71a4783
SH		 732 case SO_SNDBUFFORCE:
733 if (!capable(CAP_NET_ADMIN)) {
734 ret = -EPERM;
735 break;
736 }
737 goto set_sndbuf;
b0573dea 738
e71a4783
SH		 739 case SO_RCVBUF:
740 /* Don't error on this BSD doesn't and if you think
82981930
ED		 741 * about it this is right. Otherwise apps have to
742 * play 'guess the biggest size' games. RCVBUF/SNDBUF
743 * are treated in BSD as hints
744 */
745 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 746set_rcvbuf:
e71a4783
SH		 747 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
748 /*
749 * We double it on the way in to account for
750 * "struct sk_buff" etc. overhead. Applications
751 * assume that the SO_RCVBUF setting they make will
752 * allow that much actual data to be received on that
753 * socket.
754 *
755 * Applications are unaware that "struct sk_buff" and
756 * other overheads allocate from the receive buffer
757 * during socket buffer allocation.
758 *
759 * And after considering the possible alternatives,
760 * returning the value we actually used in getsockopt
761 * is the most desirable behavior.
762 */
82981930 763 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 764 break;
765
766 case SO_RCVBUFFORCE:
767 if (!capable(CAP_NET_ADMIN)) {
768 ret = -EPERM;
1da177e4 769 break;
e71a4783
SH		 770 }
771 goto set_rcvbuf;
1da177e4 772
e71a4783 773 case SO_KEEPALIVE:
1da177e4 774#ifdef CONFIG_INET
3e10986d
ED		 775 if (sk->sk_protocol == IPPROTO_TCP &&
776 sk->sk_type == SOCK_STREAM)
e71a4783 777 tcp_set_keepalive(sk, valbool);
1da177e4 778#endif
e71a4783
SH		 779 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
780 break;
781
782 case SO_OOBINLINE:
783 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
784 break;
785
786 case SO_NO_CHECK:
28448b80 787 sk->sk_no_check_tx = valbool;
e71a4783
SH		 788 break;
789
790 case SO_PRIORITY:
5e1fccc0
EB		 791 if ((val >= 0 && val <= 6) ||
792 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 793 sk->sk_priority = val;
794 else
795 ret = -EPERM;
796 break;
797
798 case SO_LINGER:
799 if (optlen < sizeof(ling)) {
800 ret = -EINVAL; /* 1003.1g */
1da177e4 801 break;
e71a4783 802 }
2a91525c 803 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 804 ret = -EFAULT;
1da177e4 805 break;
e71a4783
SH		 806 }
807 if (!ling.l_onoff)
808 sock_reset_flag(sk, SOCK_LINGER);
809 else {
1da177e4 810#if (BITS_PER_LONG == 32)
e71a4783
SH		 811 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
812 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 813 else
e71a4783
SH		 814#endif
815 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
816 sock_set_flag(sk, SOCK_LINGER);
817 }
818 break;
819
820 case SO_BSDCOMPAT:
821 sock_warn_obsolete_bsdism("setsockopt");
822 break;
823
824 case SO_PASSCRED:
825 if (valbool)
826 set_bit(SOCK_PASSCRED, &sock->flags);
827 else
828 clear_bit(SOCK_PASSCRED, &sock->flags);
829 break;
830
831 case SO_TIMESTAMP:
92f37fd2 832 case SO_TIMESTAMPNS:
e71a4783 833 if (valbool) {
92f37fd2
ED		 834 if (optname == SO_TIMESTAMP)
835 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
836 else
837 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 838 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 839 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 840 } else {
e71a4783 841 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 842 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
843 }
e71a4783
SH		 844 break;
845
20d49473
PO		 846 case SO_TIMESTAMPING:
847 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 848 ret = -EINVAL;
20d49473
PO		 849 break;
850 }
09c2d251 851 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765
WB		 852 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
853 if (sk->sk_protocol == IPPROTO_TCP) {
854 if (sk->sk_state != TCP_ESTABLISHED) {
855 ret = -EINVAL;
856 break;
857 }
858 sk->sk_tskey = tcp_sk(sk)->snd_una;
859 } else {
860 sk->sk_tskey = 0;
861 }
862 }
b9f40e21 863 sk->sk_tsflags = val;
20d49473
PO		 864 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
865 sock_enable_timestamp(sk,
866 SOCK_TIMESTAMPING_RX_SOFTWARE);
867 else
868 sock_disable_timestamp(sk,
08e29af3 869 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 870 break;
871
e71a4783
SH		 872 case SO_RCVLOWAT:
873 if (val < 0)
874 val = INT_MAX;
875 sk->sk_rcvlowat = val ? : 1;
876 break;
877
878 case SO_RCVTIMEO:
879 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
880 break;
881
882 case SO_SNDTIMEO:
883 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
884 break;
1da177e4 885
e71a4783
SH		 886 case SO_ATTACH_FILTER:
887 ret = -EINVAL;
888 if (optlen == sizeof(struct sock_fprog)) {
889 struct sock_fprog fprog;
1da177e4 890
e71a4783
SH		 891 ret = -EFAULT;
892 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 893 break;
e71a4783
SH		 894
895 ret = sk_attach_filter(&fprog, sk);
896 }
897 break;
898
899 case SO_DETACH_FILTER:
55b33325 900 ret = sk_detach_filter(sk);
e71a4783 901 break;
1da177e4 902
d59577b6
VB		 903 case SO_LOCK_FILTER:
904 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
905 ret = -EPERM;
906 else
907 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
908 break;
909
e71a4783
SH		 910 case SO_PASSSEC:
911 if (valbool)
912 set_bit(SOCK_PASSSEC, &sock->flags);
913 else
914 clear_bit(SOCK_PASSSEC, &sock->flags);
915 break;
4a19ec58 916 case SO_MARK:
5e1fccc0 917 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 918 ret = -EPERM;
2a91525c 919 else
4a19ec58 920 sk->sk_mark = val;
4a19ec58 921 break;
877ce7c1 922
1da177e4
LT		 923 /* We implement the SO_SNDLOWAT etc to
924 not be settable (1003.1g 5.3) */
3b885787 925 case SO_RXQ_OVFL:
8083f0fc 926 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 927 break;
6e3e939f
JB		 928
929 case SO_WIFI_STATUS:
930 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
931 break;
932
ef64a54f
PE		 933 case SO_PEEK_OFF:
934 if (sock->ops->set_peek_off)
12663bfc 935 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 936 else
937 ret = -EOPNOTSUPP;
938 break;
3bdc0eba
BG		 939
940 case SO_NOFCS:
941 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
942 break;
943
7d4c04fc
KJ		 944 case SO_SELECT_ERR_QUEUE:
945 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
946 break;
947
e0d1095a 948#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 949 case SO_BUSY_POLL:
dafcc438
ET		 950 /* allow unprivileged users to decrease the value */
951 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
952 ret = -EPERM;
953 else {
954 if (val < 0)
955 ret = -EINVAL;
956 else
957 sk->sk_ll_usec = val;
958 }
959 break;
960#endif
62748f32
ED		 961
962 case SO_MAX_PACING_RATE:
963 sk->sk_max_pacing_rate = val;
964 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
965 sk->sk_max_pacing_rate);
966 break;
967
e71a4783
SH		 968 default:
969 ret = -ENOPROTOOPT;
970 break;
4ec93edb 971 }
1da177e4
LT		 972 release_sock(sk);
973 return ret;
974}
2a91525c 975EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 976
977
8f09898b 978static void cred_to_ucred(struct pid *pid, const struct cred *cred,
979 struct ucred *ucred)
3f551f94
EB		 980{
981 ucred->pid = pid_vnr(pid);
982 ucred->uid = ucred->gid = -1;
983 if (cred) {
984 struct user_namespace *current_ns = current_user_ns();
985
b2e4f544
EB		 986 ucred->uid = from_kuid_munged(current_ns, cred->euid);
987 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 988 }
989}
990
1da177e4
LT		 991int sock_getsockopt(struct socket *sock, int level, int optname,
992 char __user *optval, int __user *optlen)
993{
994 struct sock *sk = sock->sk;
4ec93edb 995
e71a4783 996 union {
4ec93edb
YH		 997 int val;
998 struct linger ling;
1da177e4
LT		 999 struct timeval tm;
1000 } v;
4ec93edb 1001
4d0392be 1002 int lv = sizeof(int);
1da177e4 1003 int len;
4ec93edb 1004
e71a4783 1005 if (get_user(len, optlen))
4ec93edb 1006 return -EFAULT;
e71a4783 1007 if (len < 0)
1da177e4 1008 return -EINVAL;
4ec93edb 1009
50fee1de 1010 memset(&v, 0, sizeof(v));
df0bca04 1011
2a91525c 1012 switch (optname) {
e71a4783
SH		 1013 case SO_DEBUG:
1014 v.val = sock_flag(sk, SOCK_DBG);
1015 break;
1016
1017 case SO_DONTROUTE:
1018 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1019 break;
1020
1021 case SO_BROADCAST:
1b23a5df 1022 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1023 break;
1024
1025 case SO_SNDBUF:
1026 v.val = sk->sk_sndbuf;
1027 break;
1028
1029 case SO_RCVBUF:
1030 v.val = sk->sk_rcvbuf;
1031 break;
1032
1033 case SO_REUSEADDR:
1034 v.val = sk->sk_reuse;
1035 break;
1036
055dc21a
TH		 1037 case SO_REUSEPORT:
1038 v.val = sk->sk_reuseport;
1039 break;
1040
e71a4783 1041 case SO_KEEPALIVE:
1b23a5df 1042 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1043 break;
1044
1045 case SO_TYPE:
1046 v.val = sk->sk_type;
1047 break;
1048
49c794e9
JE		 1049 case SO_PROTOCOL:
1050 v.val = sk->sk_protocol;
1051 break;
1052
0d6038ee
JE		 1053 case SO_DOMAIN:
1054 v.val = sk->sk_family;
1055 break;
1056
e71a4783
SH		 1057 case SO_ERROR:
1058 v.val = -sock_error(sk);
2a91525c 1059 if (v.val == 0)
e71a4783
SH		 1060 v.val = xchg(&sk->sk_err_soft, 0);
1061 break;
1062
1063 case SO_OOBINLINE:
1b23a5df 1064 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1065 break;
1066
1067 case SO_NO_CHECK:
28448b80 1068 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1069 break;
1070
1071 case SO_PRIORITY:
1072 v.val = sk->sk_priority;
1073 break;
1074
1075 case SO_LINGER:
1076 lv = sizeof(v.ling);
1b23a5df 1077 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1078 v.ling.l_linger = sk->sk_lingertime / HZ;
1079 break;
1080
1081 case SO_BSDCOMPAT:
1082 sock_warn_obsolete_bsdism("getsockopt");
1083 break;
1084
1085 case SO_TIMESTAMP:
92f37fd2
ED		 1086 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1087 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1088 break;
1089
1090 case SO_TIMESTAMPNS:
1091 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1092 break;
1093
20d49473 1094 case SO_TIMESTAMPING:
b9f40e21 1095 v.val = sk->sk_tsflags;
20d49473
PO		 1096 break;
1097
e71a4783 1098 case SO_RCVTIMEO:
2a91525c 1099 lv = sizeof(struct timeval);
e71a4783
SH		 1100 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1101 v.tm.tv_sec = 0;
1102 v.tm.tv_usec = 0;
1103 } else {
1104 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1105 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1106 }
1107 break;
1108
1109 case SO_SNDTIMEO:
2a91525c 1110 lv = sizeof(struct timeval);
e71a4783
SH		 1111 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1112 v.tm.tv_sec = 0;
1113 v.tm.tv_usec = 0;
1114 } else {
1115 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1116 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1117 }
1118 break;
1da177e4 1119
e71a4783
SH		 1120 case SO_RCVLOWAT:
1121 v.val = sk->sk_rcvlowat;
1122 break;
1da177e4 1123
e71a4783 1124 case SO_SNDLOWAT:
2a91525c 1125 v.val = 1;
e71a4783 1126 break;
1da177e4 1127
e71a4783 1128 case SO_PASSCRED:
82981930 1129 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1130 break;
1da177e4 1131
e71a4783 1132 case SO_PEERCRED:
109f6e39
EB		 1133 {
1134 struct ucred peercred;
1135 if (len > sizeof(peercred))
1136 len = sizeof(peercred);
1137 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1138 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1139 return -EFAULT;
1140 goto lenout;
109f6e39 1141 }
1da177e4 1142
e71a4783
SH		 1143 case SO_PEERNAME:
1144 {
1145 char address[128];
1146
1147 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1148 return -ENOTCONN;
1149 if (lv < len)
1150 return -EINVAL;
1151 if (copy_to_user(optval, address, len))
1152 return -EFAULT;
1153 goto lenout;
1154 }
1da177e4 1155
e71a4783
SH		 1156 /* Dubious BSD thing... Probably nobody even uses it, but
1157 * the UNIX standard wants it for whatever reason... -DaveM
1158 */
1159 case SO_ACCEPTCONN:
1160 v.val = sk->sk_state == TCP_LISTEN;
1161 break;
1da177e4 1162
e71a4783 1163 case SO_PASSSEC:
82981930 1164 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1165 break;
877ce7c1 1166
e71a4783
SH		 1167 case SO_PEERSEC:
1168 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1169
4a19ec58
LAT		 1170 case SO_MARK:
1171 v.val = sk->sk_mark;
1172 break;
1173
3b885787 1174 case SO_RXQ_OVFL:
1b23a5df 1175 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1176 break;
1177
6e3e939f 1178 case SO_WIFI_STATUS:
1b23a5df 1179 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1180 break;
1181
ef64a54f
PE		 1182 case SO_PEEK_OFF:
1183 if (!sock->ops->set_peek_off)
1184 return -EOPNOTSUPP;
1185
1186 v.val = sk->sk_peek_off;
1187 break;
bc2f7996 1188 case SO_NOFCS:
1b23a5df 1189 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1190 break;
c91f6df2 1191
f7b86bfe 1192 case SO_BINDTODEVICE:
c91f6df2
BH		 1193 return sock_getbindtodevice(sk, optval, optlen, len);
1194
a8fc9277
PE		 1195 case SO_GET_FILTER:
1196 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1197 if (len < 0)
1198 return len;
1199
1200 goto lenout;
c91f6df2 1201
d59577b6
VB		 1202 case SO_LOCK_FILTER:
1203 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1204 break;
1205
ea02f941
MS		 1206 case SO_BPF_EXTENSIONS:
1207 v.val = bpf_tell_extensions();
1208 break;
1209
7d4c04fc
KJ		 1210 case SO_SELECT_ERR_QUEUE:
1211 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1212 break;
1213
e0d1095a 1214#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1215 case SO_BUSY_POLL:
dafcc438
ET		 1216 v.val = sk->sk_ll_usec;
1217 break;
1218#endif
1219
62748f32
ED		 1220 case SO_MAX_PACING_RATE:
1221 v.val = sk->sk_max_pacing_rate;
1222 break;
1223
e71a4783
SH		 1224 default:
1225 return -ENOPROTOOPT;
1da177e4 1226 }
e71a4783 1227
1da177e4
LT		 1228 if (len > lv)
1229 len = lv;
1230 if (copy_to_user(optval, &v, len))
1231 return -EFAULT;
1232lenout:
4ec93edb
YH		 1233 if (put_user(len, optlen))
1234 return -EFAULT;
1235 return 0;
1da177e4
LT		 1236}
1237
a5b5bb9a
IM		 1238/*
1239 * Initialize an sk_lock.
1240 *
1241 * (We also register the sk_lock with the lock validator.)
1242 */
b6f99a21 1243static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1244{
ed07536e
PZ		 1245 sock_lock_init_class_and_name(sk,
1246 af_family_slock_key_strings[sk->sk_family],
1247 af_family_slock_keys + sk->sk_family,
1248 af_family_key_strings[sk->sk_family],
1249 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1250}
1251
4dc6dc71
ED		 1252/*
1253 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1254 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1255 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1256 */
f1a6c4da
PE		 1257static void sock_copy(struct sock *nsk, const struct sock *osk)
1258{
1259#ifdef CONFIG_SECURITY_NETWORK
1260 void *sptr = nsk->sk_security;
1261#endif
68835aba
ED		 1262 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1263
1264 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1265 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1266
f1a6c4da
PE		 1267#ifdef CONFIG_SECURITY_NETWORK
1268 nsk->sk_security = sptr;
1269 security_sk_clone(osk, nsk);
1270#endif
1271}
1272
fcbdf09d
OP		 1273void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1274{
1275 unsigned long nulls1, nulls2;
1276
1277 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1278 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1279 if (nulls1 > nulls2)
1280 swap(nulls1, nulls2);
1281
1282 if (nulls1 != 0)
1283 memset((char *)sk, 0, nulls1);
1284 memset((char *)sk + nulls1 + sizeof(void *), 0,
1285 nulls2 - nulls1 - sizeof(void *));
1286 memset((char *)sk + nulls2 + sizeof(void *), 0,
1287 size - nulls2 - sizeof(void *));
1288}
1289EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1290
2e4afe7b
PE		 1291static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1292 int family)
c308c1b2
PE		 1293{
1294 struct sock *sk;
1295 struct kmem_cache *slab;
1296
1297 slab = prot->slab;
e912b114
ED		 1298 if (slab != NULL) {
1299 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1300 if (!sk)
1301 return sk;
1302 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1303 if (prot->clear_sk)
1304 prot->clear_sk(sk, prot->obj_size);
1305 else
1306 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1307 }
fcbdf09d 1308 } else
c308c1b2
PE		 1309 sk = kmalloc(prot->obj_size, priority);
1310
2e4afe7b 1311 if (sk != NULL) {
a98b65a3
VN		 1312 kmemcheck_annotate_bitfield(sk, flags);
1313
2e4afe7b
PE		 1314 if (security_sk_alloc(sk, family, priority))
1315 goto out_free;
1316
1317 if (!try_module_get(prot->owner))
1318 goto out_free_sec;
e022f0b4 1319 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1320 }
1321
c308c1b2 1322 return sk;
2e4afe7b
PE		 1323
1324out_free_sec:
1325 security_sk_free(sk);
1326out_free:
1327 if (slab != NULL)
1328 kmem_cache_free(slab, sk);
1329 else
1330 kfree(sk);
1331 return NULL;
c308c1b2
PE		 1332}
1333
1334static void sk_prot_free(struct proto *prot, struct sock *sk)
1335{
1336 struct kmem_cache *slab;
2e4afe7b 1337 struct module *owner;
c308c1b2 1338
2e4afe7b 1339 owner = prot->owner;
c308c1b2 1340 slab = prot->slab;
2e4afe7b
PE		 1341
1342 security_sk_free(sk);
c308c1b2
PE		 1343 if (slab != NULL)
1344 kmem_cache_free(slab, sk);
1345 else
1346 kfree(sk);
2e4afe7b 1347 module_put(owner);
c308c1b2
PE		 1348}
1349
86f8515f 1350#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
6ffd4641 1351void sock_update_netprioidx(struct sock *sk)
5bc1421e 1352{
5bc1421e
NH		 1353 if (in_interrupt())
1354 return;
2b73bc65 1355
6ffd4641 1356 sk->sk_cgrp_prioidx = task_netprioidx(current);
5bc1421e
NH		 1357}
1358EXPORT_SYMBOL_GPL(sock_update_netprioidx);
f8451725
HX		 1359#endif
1360
1da177e4
LT		 1361/**
1362 * sk_alloc - All socket objects are allocated here
c4ea43c5 1363 * @net: the applicable net namespace
4dc3b16b
PP		 1364 * @family: protocol family
1365 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1366 * @prot: struct proto associated with this new sock instance
1da177e4 1367 */
1b8d7ae4 1368struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1369 struct proto *prot)
1da177e4 1370{
c308c1b2 1371 struct sock *sk;
1da177e4 1372
154adbc8 1373 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1374 if (sk) {
154adbc8
PE		 1375 sk->sk_family = family;
1376 /*
1377 * See comment in struct sock definition to understand
1378 * why we need sk_prot_creator -acme
1379 */
1380 sk->sk_prot = sk->sk_prot_creator = prot;
1381 sock_lock_init(sk);
3b1e0a65 1382 sock_net_set(sk, get_net(net));
d66ee058 1383 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1384
211d2f97 1385 sock_update_classid(sk);
6ffd4641 1386 sock_update_netprioidx(sk);
1da177e4 1387 }
a79af59e 1388
2e4afe7b 1389 return sk;
1da177e4 1390}
2a91525c 1391EXPORT_SYMBOL(sk_alloc);
1da177e4 1392
2b85a34e 1393static void __sk_free(struct sock *sk)
1da177e4
LT		 1394{
1395 struct sk_filter *filter;
1da177e4
LT		 1396
1397 if (sk->sk_destruct)
1398 sk->sk_destruct(sk);
1399
a898def2
PM		 1400 filter = rcu_dereference_check(sk->sk_filter,
1401 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1402 if (filter) {
309dd5fc 1403 sk_filter_uncharge(sk, filter);
a9b3cd7f 1404 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1405 }
1406
08e29af3 1407 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1408
1409 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1410 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1411 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1412
109f6e39
EB		 1413 if (sk->sk_peer_cred)
1414 put_cred(sk->sk_peer_cred);
1415 put_pid(sk->sk_peer_pid);
3b1e0a65 1416 put_net(sock_net(sk));
c308c1b2 1417 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1418}
2b85a34e
ED		 1419
1420void sk_free(struct sock *sk)
1421{
1422 /*
25985edc 1423 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1424 * some packets are still in some tx queue.
1425 * If not null, sock_wfree() will call __sk_free(sk) later
1426 */
1427 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1428 __sk_free(sk);
1429}
2a91525c 1430EXPORT_SYMBOL(sk_free);
1da177e4 1431
edf02087 1432/*
25985edc
LDM		 1433 * Last sock_put should drop reference to sk->sk_net. It has already
1434 * been dropped in sk_change_net. Taking reference to stopping namespace
edf02087 1435 * is not an option.
25985edc 1436 * Take reference to a socket to remove it from hash _alive_ and after that
edf02087
DL		 1437 * destroy it in the context of init_net.
1438 */
1439void sk_release_kernel(struct sock *sk)
1440{
1441 if (sk == NULL || sk->sk_socket == NULL)
1442 return;
1443
1444 sock_hold(sk);
1445 sock_release(sk->sk_socket);
65a18ec5 1446 release_net(sock_net(sk));
3b1e0a65 1447 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1448 sock_put(sk);
1449}
45af1754 1450EXPORT_SYMBOL(sk_release_kernel);
edf02087 1451
475f1b52
SR		 1452static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1453{
1454 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1455 sock_update_memcg(newsk);
1456}
1457
e56c57d0
ED		 1458/**
1459 * sk_clone_lock - clone a socket, and lock its clone
1460 * @sk: the socket to clone
1461 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1462 *
1463 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1464 */
1465struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1466{
8fd1d178 1467 struct sock *newsk;
278571ba 1468 bool is_charged = true;
87d11ceb 1469
8fd1d178 1470 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1471 if (newsk != NULL) {
1472 struct sk_filter *filter;
1473
892c141e 1474 sock_copy(newsk, sk);
87d11ceb
ACM		 1475
1476 /* SANITY */
3b1e0a65 1477 get_net(sock_net(newsk));
87d11ceb
ACM		 1478 sk_node_init(&newsk->sk_node);
1479 sock_lock_init(newsk);
1480 bh_lock_sock(newsk);
fa438ccf 1481 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1482 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1483
1484 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1485 /*
1486 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1487 */
1488 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1489 atomic_set(&newsk->sk_omem_alloc, 0);
1490 skb_queue_head_init(&newsk->sk_receive_queue);
1491 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1492#ifdef CONFIG_NET_DMA
1493 skb_queue_head_init(&newsk->sk_async_wait_queue);
1494#endif
87d11ceb 1495
b6c6712a 1496 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1497 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1498 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1499 af_callback_keys + newsk->sk_family,
1500 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1501
1502 newsk->sk_dst_cache = NULL;
1503 newsk->sk_wmem_queued = 0;
1504 newsk->sk_forward_alloc = 0;
1505 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1506 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1507
1508 sock_reset_flag(newsk, SOCK_DONE);
1509 skb_queue_head_init(&newsk->sk_error_queue);
1510
0d7da9dd 1511 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb 1512 if (filter != NULL)
278571ba
AS		 1513 /* though it's an empty new sock, the charging may fail
1514 * if sysctl_optmem_max was changed between creation of
1515 * original socket and cloning
1516 */
1517 is_charged = sk_filter_charge(newsk, filter);
87d11ceb 1518
278571ba 1519 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk))) {
87d11ceb
ACM		 1520 /* It is still raw copy of parent, so invalidate
1521 * destructor and make plain sk_free() */
1522 newsk->sk_destruct = NULL;
b0691c8e 1523 bh_unlock_sock(newsk);
87d11ceb
ACM		 1524 sk_free(newsk);
1525 newsk = NULL;
1526 goto out;
1527 }
1528
1529 newsk->sk_err = 0;
1530 newsk->sk_priority = 0;
4dc6dc71
ED		 1531 /*
1532 * Before updating sk_refcnt, we must commit prior changes to memory
1533 * (Documentation/RCU/rculist_nulls.txt for details)
1534 */
1535 smp_wmb();
87d11ceb
ACM		 1536 atomic_set(&newsk->sk_refcnt, 2);
1537
1538 /*
1539 * Increment the counter in the same struct proto as the master
1540 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1541 * is the same as sk->sk_prot->socks, as this field was copied
1542 * with memcpy).
1543 *
1544 * This _changes_ the previous behaviour, where
1545 * tcp_create_openreq_child always was incrementing the
1546 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1547 * to be taken into account in all callers. -acme
1548 */
1549 sk_refcnt_debug_inc(newsk);
972692e0 1550 sk_set_socket(newsk, NULL);
43815482 1551 newsk->sk_wq = NULL;
87d11ceb 1552
f3f511e1
GC		 1553 sk_update_clone(sk, newsk);
1554
87d11ceb 1555 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1556 sk_sockets_allocated_inc(newsk);
704da560 1557
08e29af3 1558 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1559 net_enable_timestamp();
87d11ceb
ACM		 1560 }
1561out:
1562 return newsk;
1563}
e56c57d0 1564EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1565
9958089a
AK		 1566void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1567{
1568 __sk_dst_set(sk, dst);
1569 sk->sk_route_caps = dst->dev->features;
1570 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1571 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1572 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1573 if (sk_can_gso(sk)) {
82cc1a7a 1574 if (dst->header_len) {
9958089a 1575 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1576 } else {
9958089a 1577 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1578 sk->sk_gso_max_size = dst->dev->gso_max_size;
1485348d 1579 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
82cc1a7a 1580 }
9958089a
AK		 1581 }
1582}
1583EXPORT_SYMBOL_GPL(sk_setup_caps);
1584
1da177e4
LT		 1585/*
1586 * Simple resource managers for sockets.
1587 */
1588
1589
4ec93edb
YH		 1590/*
1591 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1592 */
1593void sock_wfree(struct sk_buff *skb)
1594{
1595 struct sock *sk = skb->sk;
d99927f4 1596 unsigned int len = skb->truesize;
1da177e4 1597
d99927f4
ED		 1598 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1599 /*
1600 * Keep a reference on sk_wmem_alloc, this will be released
1601 * after sk_write_space() call
1602 */
1603 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1604 sk->sk_write_space(sk);
d99927f4
ED		 1605 len = 1;
1606 }
2b85a34e 1607 /*
d99927f4
ED		 1608 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1609 * could not do because of in-flight packets
2b85a34e 1610 */
d99927f4 1611 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1612 __sk_free(sk);
1da177e4 1613}
2a91525c 1614EXPORT_SYMBOL(sock_wfree);
1da177e4 1615
f2f872f9
ED		 1616void skb_orphan_partial(struct sk_buff *skb)
1617{
1618 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1619 * so we do not completely orphan skb, but transfert all
1620 * accounted bytes but one, to avoid unexpected reorders.
1621 */
1622 if (skb->destructor == sock_wfree
1623#ifdef CONFIG_INET
1624 || skb->destructor == tcp_wfree
1625#endif
1626 ) {
1627 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1628 skb->truesize = 1;
1629 } else {
1630 skb_orphan(skb);
1631 }
1632}
1633EXPORT_SYMBOL(skb_orphan_partial);
1634
4ec93edb
YH		 1635/*
1636 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1637 */
1638void sock_rfree(struct sk_buff *skb)
1639{
1640 struct sock *sk = skb->sk;
d361fd59 1641 unsigned int len = skb->truesize;
1da177e4 1642
d361fd59
ED		 1643 atomic_sub(len, &sk->sk_rmem_alloc);
1644 sk_mem_uncharge(sk, len);
1da177e4 1645}
2a91525c 1646EXPORT_SYMBOL(sock_rfree);
1da177e4 1647
41063e9d
DM		 1648void sock_edemux(struct sk_buff *skb)
1649{
e812347c
ED		 1650 struct sock *sk = skb->sk;
1651
1c463e57 1652#ifdef CONFIG_INET
e812347c
ED		 1653 if (sk->sk_state == TCP_TIME_WAIT)
1654 inet_twsk_put(inet_twsk(sk));
1655 else
1c463e57 1656#endif
e812347c 1657 sock_put(sk);
41063e9d
DM		 1658}
1659EXPORT_SYMBOL(sock_edemux);
1da177e4 1660
976d0201 1661kuid_t sock_i_uid(struct sock *sk)
1da177e4 1662{
976d0201 1663 kuid_t uid;
1da177e4 1664
f064af1e 1665 read_lock_bh(&sk->sk_callback_lock);
976d0201 1666 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1667 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1668 return uid;
1669}
2a91525c 1670EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1671
1672unsigned long sock_i_ino(struct sock *sk)
1673{
1674 unsigned long ino;
1675
f064af1e 1676 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1677 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1678 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1679 return ino;
1680}
2a91525c 1681EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1682
1683/*
1684 * Allocate a skb from the socket's send buffer.
1685 */
86a76caf 1686struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1687 gfp_t priority)
1da177e4
LT		 1688{
1689 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1690 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1691 if (skb) {
1692 skb_set_owner_w(skb, sk);
1693 return skb;
1694 }
1695 }
1696 return NULL;
1697}
2a91525c 1698EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1699
4ec93edb 1700/*
1da177e4 1701 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1702 */
dd0fc66f 1703void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1704{
95c96174 1705 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1706 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1707 void *mem;
1708 /* First do the add, to avoid the race if kmalloc
4ec93edb 1709 * might sleep.
1da177e4
LT		 1710 */
1711 atomic_add(size, &sk->sk_omem_alloc);
1712 mem = kmalloc(size, priority);
1713 if (mem)
1714 return mem;
1715 atomic_sub(size, &sk->sk_omem_alloc);
1716 }
1717 return NULL;
1718}
2a91525c 1719EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1720
1721/*
1722 * Free an option memory block.
1723 */
1724void sock_kfree_s(struct sock *sk, void *mem, int size)
1725{
1726 kfree(mem);
1727 atomic_sub(size, &sk->sk_omem_alloc);
1728}
2a91525c 1729EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1730
1731/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1732 I think, these locks should be removed for datagram sockets.
1733 */
2a91525c 1734static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1735{
1736 DEFINE_WAIT(wait);
1737
1738 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1739 for (;;) {
1740 if (!timeo)
1741 break;
1742 if (signal_pending(current))
1743 break;
1744 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1745 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1746 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1747 break;
1748 if (sk->sk_shutdown & SEND_SHUTDOWN)
1749 break;
1750 if (sk->sk_err)
1751 break;
1752 timeo = schedule_timeout(timeo);
1753 }
aa395145 1754 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1755 return timeo;
1756}
1757
1758
1759/*
1760 * Generic send/receive buffer handlers
1761 */
1762
4cc7f68d
HX		 1763struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1764 unsigned long data_len, int noblock,
28d64271 1765 int *errcode, int max_page_order)
1da177e4 1766{
28d64271
ED		 1767 struct sk_buff *skb = NULL;
1768 unsigned long chunk;
7d877f3b 1769 gfp_t gfp_mask;
1da177e4
LT		 1770 long timeo;
1771 int err;
cc9b17ad 1772 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
28d64271
ED		 1773 struct page *page;
1774 int i;
cc9b17ad
JW		 1775
1776 err = -EMSGSIZE;
1777 if (npages > MAX_SKB_FRAGS)
1778 goto failure;
1da177e4 1779
1da177e4 1780 timeo = sock_sndtimeo(sk, noblock);
28d64271 1781 while (!skb) {
1da177e4
LT		 1782 err = sock_error(sk);
1783 if (err != 0)
1784 goto failure;
1785
1786 err = -EPIPE;
1787 if (sk->sk_shutdown & SEND_SHUTDOWN)
1788 goto failure;
1789
28d64271
ED		 1790 if (atomic_read(&sk->sk_wmem_alloc) >= sk->sk_sndbuf) {
1791 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1792 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1793 err = -EAGAIN;
1794 if (!timeo)
1795 goto failure;
1796 if (signal_pending(current))
1797 goto interrupted;
1798 timeo = sock_wait_for_wmem(sk, timeo);
1799 continue;
1800 }
1da177e4 1801
28d64271
ED		 1802 err = -ENOBUFS;
1803 gfp_mask = sk->sk_allocation;
1804 if (gfp_mask & __GFP_WAIT)
1805 gfp_mask |= __GFP_REPEAT;
1806
1807 skb = alloc_skb(header_len, gfp_mask);
1808 if (!skb)
1da177e4 1809 goto failure;
28d64271
ED		 1810
1811 skb->truesize += data_len;
1812
1813 for (i = 0; npages > 0; i++) {
1814 int order = max_page_order;
1815
1816 while (order) {
1817 if (npages >= 1 << order) {
1818 page = alloc_pages(sk->sk_allocation |
ed98df33
ED		 1819 __GFP_COMP |
1820 __GFP_NOWARN |
1821 __GFP_NORETRY,
28d64271
ED		 1822 order);
1823 if (page)
1824 goto fill_page;
1825 }
1826 order--;
1827 }
1828 page = alloc_page(sk->sk_allocation);
1829 if (!page)
1830 goto failure;
1831fill_page:
1832 chunk = min_t(unsigned long, data_len,
1833 PAGE_SIZE << order);
1834 skb_fill_page_desc(skb, i, page, 0, chunk);
1835 data_len -= chunk;
1836 npages -= 1 << order;
1da177e4 1837 }
1da177e4
LT		 1838 }
1839
1840 skb_set_owner_w(skb, sk);
1841 return skb;
1842
1843interrupted:
1844 err = sock_intr_errno(timeo);
1845failure:
28d64271 1846 kfree_skb(skb);
1da177e4
LT		 1847 *errcode = err;
1848 return NULL;
1849}
4cc7f68d 1850EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1851
4ec93edb 1852struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1853 int noblock, int *errcode)
1854{
28d64271 1855 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1856}
2a91525c 1857EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1858
5640f768
ED		 1859/* On 32bit arches, an skb frag is limited to 2^15 */
1860#define SKB_FRAG_PAGE_ORDER get_order(32768)
1861
400dfd3a
ED		 1862/**
1863 * skb_page_frag_refill - check that a page_frag contains enough room
1864 * @sz: minimum size of the fragment we want to get
1865 * @pfrag: pointer to page_frag
1866 * @prio: priority for memory allocation
1867 *
1868 * Note: While this allocator tries to use high order pages, there is
1869 * no guarantee that allocations succeed. Therefore, @sz MUST be
1870 * less or equal than PAGE_SIZE.
1871 */
1872bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t prio)
5640f768
ED		 1873{
1874 int order;
1875
1876 if (pfrag->page) {
1877 if (atomic_read(&pfrag->page->_count) == 1) {
1878 pfrag->offset = 0;
1879 return true;
1880 }
400dfd3a 1881 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1882 return true;
1883 put_page(pfrag->page);
1884 }
1885
097b4f19 1886 order = SKB_FRAG_PAGE_ORDER;
5640f768 1887 do {
400dfd3a 1888 gfp_t gfp = prio;
5640f768
ED		 1889
1890 if (order)
ed98df33 1891 gfp |= __GFP_COMP | __GFP_NOWARN | __GFP_NORETRY;
5640f768
ED		 1892 pfrag->page = alloc_pages(gfp, order);
1893 if (likely(pfrag->page)) {
1894 pfrag->offset = 0;
1895 pfrag->size = PAGE_SIZE << order;
1896 return true;
1897 }
1898 } while (--order >= 0);
1899
400dfd3a
ED		 1900 return false;
1901}
1902EXPORT_SYMBOL(skb_page_frag_refill);
1903
1904bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1905{
1906 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1907 return true;
1908
5640f768
ED		 1909 sk_enter_memory_pressure(sk);
1910 sk_stream_moderate_sndbuf(sk);
1911 return false;
1912}
1913EXPORT_SYMBOL(sk_page_frag_refill);
1914
1da177e4 1915static void __lock_sock(struct sock *sk)
f39234d6
NK		 1916 __releases(&sk->sk_lock.slock)
1917 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1918{
1919 DEFINE_WAIT(wait);
1920
e71a4783 1921 for (;;) {
1da177e4
LT		 1922 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1923 TASK_UNINTERRUPTIBLE);
1924 spin_unlock_bh(&sk->sk_lock.slock);
1925 schedule();
1926 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1927 if (!sock_owned_by_user(sk))
1da177e4
LT		 1928 break;
1929 }
1930 finish_wait(&sk->sk_lock.wq, &wait);
1931}
1932
1933static void __release_sock(struct sock *sk)
f39234d6
NK		 1934 __releases(&sk->sk_lock.slock)
1935 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1936{
1937 struct sk_buff *skb = sk->sk_backlog.head;
1938
1939 do {
1940 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1941 bh_unlock_sock(sk);
1942
1943 do {
1944 struct sk_buff *next = skb->next;
1945
e4cbb02a 1946 prefetch(next);
7fee226a 1947 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1948 skb->next = NULL;
c57943a1 1949 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1950
1951 /*
1952 * We are in process context here with softirqs
1953 * disabled, use cond_resched_softirq() to preempt.
1954 * This is safe to do because we've taken the backlog
1955 * queue private:
1956 */
1957 cond_resched_softirq();
1958
1959 skb = next;
1960 } while (skb != NULL);
1961
1962 bh_lock_sock(sk);
e71a4783 1963 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1964
1965 /*
1966 * Doing the zeroing here guarantee we can not loop forever
1967 * while a wild producer attempts to flood us.
1968 */
1969 sk->sk_backlog.len = 0;
1da177e4
LT		 1970}
1971
1972/**
1973 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1974 * @sk: sock to wait on
1975 * @timeo: for how long
1da177e4
LT		 1976 *
1977 * Now socket state including sk->sk_err is changed only under lock,
1978 * hence we may omit checks after joining wait queue.
1979 * We check receive queue before schedule() only as optimization;
1980 * it is very likely that release_sock() added new data.
1981 */
1982int sk_wait_data(struct sock *sk, long *timeo)
1983{
1984 int rc;
1985 DEFINE_WAIT(wait);
1986
aa395145 1987 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1988 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1989 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1990 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1991 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1992 return rc;
1993}
1da177e4
LT		 1994EXPORT_SYMBOL(sk_wait_data);
1995
3ab224be
HA		 1996/**
1997 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1998 * @sk: socket
1999 * @size: memory size to allocate
2000 * @kind: allocation type
2001 *
2002 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2003 * rmem allocation. This function assumes that protocols which have
2004 * memory_pressure use sk_wmem_queued as write buffer accounting.
2005 */
2006int __sk_mem_schedule(struct sock *sk, int size, int kind)
2007{
2008 struct proto *prot = sk->sk_prot;
2009 int amt = sk_mem_pages(size);
8d987e5c 2010 long allocated;
e1aab161 2011 int parent_status = UNDER_LIMIT;
3ab224be
HA		 2012
2013 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 2014
e1aab161 2015 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 2016
2017 /* Under limit. */
e1aab161
GC		 2018 if (parent_status == UNDER_LIMIT &&
2019 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2020 sk_leave_memory_pressure(sk);
3ab224be
HA		 2021 return 1;
2022 }
2023
e1aab161
GC		 2024 /* Under pressure. (we or our parents) */
2025 if ((parent_status > SOFT_LIMIT) ||
2026 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2027 sk_enter_memory_pressure(sk);
3ab224be 2028
e1aab161
GC		 2029 /* Over hard limit (we or our parents) */
2030 if ((parent_status == OVER_LIMIT) ||
2031 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 2032 goto suppress_allocation;
2033
2034 /* guarantee minimum buffer size under pressure */
2035 if (kind == SK_MEM_RECV) {
2036 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2037 return 1;
180d8cd9 2038
3ab224be
HA		 2039 } else { /* SK_MEM_SEND */
2040 if (sk->sk_type == SOCK_STREAM) {
2041 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2042 return 1;
2043 } else if (atomic_read(&sk->sk_wmem_alloc) <
2044 prot->sysctl_wmem[0])
2045 return 1;
2046 }
2047
180d8cd9 2048 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2049 int alloc;
2050
180d8cd9 2051 if (!sk_under_memory_pressure(sk))
1748376b 2052 return 1;
180d8cd9
GC		 2053 alloc = sk_sockets_allocated_read_positive(sk);
2054 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2055 sk_mem_pages(sk->sk_wmem_queued +
2056 atomic_read(&sk->sk_rmem_alloc) +
2057 sk->sk_forward_alloc))
2058 return 1;
2059 }
2060
2061suppress_allocation:
2062
2063 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2064 sk_stream_moderate_sndbuf(sk);
2065
2066 /* Fail only if socket is _under_ its sndbuf.
2067 * In this case we cannot block, so that we have to fail.
2068 */
2069 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2070 return 1;
2071 }
2072
3847ce32
SM		 2073 trace_sock_exceed_buf_limit(sk, prot, allocated);
2074
3ab224be
HA		 2075 /* Alas. Undo changes. */
2076 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2077
0e90b31f 2078 sk_memory_allocated_sub(sk, amt);
180d8cd9 2079
3ab224be
HA		 2080 return 0;
2081}
3ab224be
HA		 2082EXPORT_SYMBOL(__sk_mem_schedule);
2083
2084/**
2085 * __sk_reclaim - reclaim memory_allocated
2086 * @sk: socket
2087 */
2088void __sk_mem_reclaim(struct sock *sk)
2089{
180d8cd9 2090 sk_memory_allocated_sub(sk,
0e90b31f 2091 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
3ab224be
HA		 2092 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
2093
180d8cd9
GC		 2094 if (sk_under_memory_pressure(sk) &&
2095 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2096 sk_leave_memory_pressure(sk);
3ab224be 2097}
3ab224be
HA		 2098EXPORT_SYMBOL(__sk_mem_reclaim);
2099
2100
1da177e4
LT		 2101/*
2102 * Set of default routines for initialising struct proto_ops when
2103 * the protocol does not support a particular function. In certain
2104 * cases where it makes no sense for a protocol to have a "do nothing"
2105 * function, some default processing is provided.
2106 */
2107
2108int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2109{
2110 return -EOPNOTSUPP;
2111}
2a91525c 2112EXPORT_SYMBOL(sock_no_bind);
1da177e4 2113
4ec93edb 2114int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2115 int len, int flags)
2116{
2117 return -EOPNOTSUPP;
2118}
2a91525c 2119EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2120
2121int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2122{
2123 return -EOPNOTSUPP;
2124}
2a91525c 2125EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2126
2127int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2128{
2129 return -EOPNOTSUPP;
2130}
2a91525c 2131EXPORT_SYMBOL(sock_no_accept);
1da177e4 2132
4ec93edb 2133int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2134 int *len, int peer)
2135{
2136 return -EOPNOTSUPP;
2137}
2a91525c 2138EXPORT_SYMBOL(sock_no_getname);
1da177e4 2139
2a91525c 2140unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2141{
2142 return 0;
2143}
2a91525c 2144EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2145
2146int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2147{
2148 return -EOPNOTSUPP;
2149}
2a91525c 2150EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2151
2152int sock_no_listen(struct socket *sock, int backlog)
2153{
2154 return -EOPNOTSUPP;
2155}
2a91525c 2156EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2157
2158int sock_no_shutdown(struct socket *sock, int how)
2159{
2160 return -EOPNOTSUPP;
2161}
2a91525c 2162EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2163
2164int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2165 char __user *optval, unsigned int optlen)
1da177e4
LT		 2166{
2167 return -EOPNOTSUPP;
2168}
2a91525c 2169EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2170
2171int sock_no_getsockopt(struct socket *sock, int level, int optname,
2172 char __user *optval, int __user *optlen)
2173{
2174 return -EOPNOTSUPP;
2175}
2a91525c 2176EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 2177
2178int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2179 size_t len)
2180{
2181 return -EOPNOTSUPP;
2182}
2a91525c 2183EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 2184
2185int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2186 size_t len, int flags)
2187{
2188 return -EOPNOTSUPP;
2189}
2a91525c 2190EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2191
2192int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2193{
2194 /* Mirror missing mmap method error code */
2195 return -ENODEV;
2196}
2a91525c 2197EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2198
2199ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2200{
2201 ssize_t res;
2202 struct msghdr msg = {.msg_flags = flags};
2203 struct kvec iov;
2204 char *kaddr = kmap(page);
2205 iov.iov_base = kaddr + offset;
2206 iov.iov_len = size;
2207 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2208 kunmap(page);
2209 return res;
2210}
2a91525c 2211EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2212
2213/*
2214 * Default Socket Callbacks
2215 */
2216
2217static void sock_def_wakeup(struct sock *sk)
2218{
43815482
ED		 2219 struct socket_wq *wq;
2220
2221 rcu_read_lock();
2222 wq = rcu_dereference(sk->sk_wq);
2223 if (wq_has_sleeper(wq))
2224 wake_up_interruptible_all(&wq->wait);
2225 rcu_read_unlock();
1da177e4
LT		 2226}
2227
2228static void sock_def_error_report(struct sock *sk)
2229{
43815482
ED		 2230 struct socket_wq *wq;
2231
2232 rcu_read_lock();
2233 wq = rcu_dereference(sk->sk_wq);
2234 if (wq_has_sleeper(wq))
2235 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2236 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2237 rcu_read_unlock();
1da177e4
LT		 2238}
2239
676d2369 2240static void sock_def_readable(struct sock *sk)
1da177e4 2241{
43815482
ED		 2242 struct socket_wq *wq;
2243
2244 rcu_read_lock();
2245 wq = rcu_dereference(sk->sk_wq);
2246 if (wq_has_sleeper(wq))
2c6607c6 2247 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2248 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2249 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2250 rcu_read_unlock();
1da177e4
LT		 2251}
2252
2253static void sock_def_write_space(struct sock *sk)
2254{
43815482
ED		 2255 struct socket_wq *wq;
2256
2257 rcu_read_lock();
1da177e4
LT		 2258
2259 /* Do not wake up a writer until he can make "significant"
2260 * progress. --DaveM
2261 */
e71a4783 2262 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2263 wq = rcu_dereference(sk->sk_wq);
2264 if (wq_has_sleeper(wq))
2265 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2266 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2267
2268 /* Should agree with poll, otherwise some programs break */
2269 if (sock_writeable(sk))
8d8ad9d7 2270 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2271 }
2272
43815482 2273 rcu_read_unlock();
1da177e4
LT		 2274}
2275
2276static void sock_def_destruct(struct sock *sk)
2277{
a51482bd 2278 kfree(sk->sk_protinfo);
1da177e4
LT		 2279}
2280
2281void sk_send_sigurg(struct sock *sk)
2282{
2283 if (sk->sk_socket && sk->sk_socket->file)
2284 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2285 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2286}
2a91525c 2287EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2288
2289void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2290 unsigned long expires)
2291{
2292 if (!mod_timer(timer, expires))
2293 sock_hold(sk);
2294}
1da177e4
LT		 2295EXPORT_SYMBOL(sk_reset_timer);
2296
2297void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2298{
25cc4ae9 2299 if (del_timer(timer))
1da177e4
LT		 2300 __sock_put(sk);
2301}
1da177e4
LT		 2302EXPORT_SYMBOL(sk_stop_timer);
2303
2304void sock_init_data(struct socket *sock, struct sock *sk)
2305{
2306 skb_queue_head_init(&sk->sk_receive_queue);
2307 skb_queue_head_init(&sk->sk_write_queue);
2308 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 2309#ifdef CONFIG_NET_DMA
2310 skb_queue_head_init(&sk->sk_async_wait_queue);
2311#endif
1da177e4
LT		 2312
2313 sk->sk_send_head = NULL;
2314
2315 init_timer(&sk->sk_timer);
4ec93edb 2316
1da177e4
LT		 2317 sk->sk_allocation = GFP_KERNEL;
2318 sk->sk_rcvbuf = sysctl_rmem_default;
2319 sk->sk_sndbuf = sysctl_wmem_default;
2320 sk->sk_state = TCP_CLOSE;
972692e0 2321 sk_set_socket(sk, sock);
1da177e4
LT		 2322
2323 sock_set_flag(sk, SOCK_ZAPPED);
2324
e71a4783 2325 if (sock) {
1da177e4 2326 sk->sk_type = sock->type;
43815482 2327 sk->sk_wq = sock->wq;
1da177e4
LT		 2328 sock->sk = sk;
2329 } else
43815482 2330 sk->sk_wq = NULL;
1da177e4 2331
b6c6712a 2332 spin_lock_init(&sk->sk_dst_lock);
1da177e4 2333 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2334 lockdep_set_class_and_name(&sk->sk_callback_lock,
2335 af_callback_keys + sk->sk_family,
2336 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2337
2338 sk->sk_state_change = sock_def_wakeup;
2339 sk->sk_data_ready = sock_def_readable;
2340 sk->sk_write_space = sock_def_write_space;
2341 sk->sk_error_report = sock_def_error_report;
2342 sk->sk_destruct = sock_def_destruct;
2343
5640f768
ED		 2344 sk->sk_frag.page = NULL;
2345 sk->sk_frag.offset = 0;
ef64a54f 2346 sk->sk_peek_off = -1;
1da177e4 2347
109f6e39
EB		 2348 sk->sk_peer_pid = NULL;
2349 sk->sk_peer_cred = NULL;
1da177e4
LT		 2350 sk->sk_write_pending = 0;
2351 sk->sk_rcvlowat = 1;
2352 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2353 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2354
f37f0afb 2355 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2356
e0d1095a 2357#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2358 sk->sk_napi_id = 0;
64b0dc51 2359 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2360#endif
2361
62748f32 2362 sk->sk_max_pacing_rate = ~0U;
7eec4174 2363 sk->sk_pacing_rate = ~0U;
4dc6dc71
ED		 2364 /*
2365 * Before updating sk_refcnt, we must commit prior changes to memory
2366 * (Documentation/RCU/rculist_nulls.txt for details)
2367 */
2368 smp_wmb();
1da177e4 2369 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2370 atomic_set(&sk->sk_drops, 0);
1da177e4 2371}
2a91525c 2372EXPORT_SYMBOL(sock_init_data);
1da177e4 2373
b5606c2d 2374void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2375{
2376 might_sleep();
a5b5bb9a 2377 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2378 if (sk->sk_lock.owned)
1da177e4 2379 __lock_sock(sk);
d2e9117c 2380 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2381 spin_unlock(&sk->sk_lock.slock);
2382 /*
2383 * The sk_lock has mutex_lock() semantics here:
2384 */
fcc70d5f 2385 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2386 local_bh_enable();
1da177e4 2387}
fcc70d5f 2388EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2389
b5606c2d 2390void release_sock(struct sock *sk)
1da177e4 2391{
a5b5bb9a
IM		 2392 /*
2393 * The sk_lock has mutex_unlock() semantics:
2394 */
2395 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2396
2397 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2398 if (sk->sk_backlog.tail)
2399 __release_sock(sk);
46d3ceab 2400
c3f9b018
ED		 2401 /* Warning : release_cb() might need to release sk ownership,
2402 * ie call sock_release_ownership(sk) before us.
2403 */
46d3ceab
ED		 2404 if (sk->sk_prot->release_cb)
2405 sk->sk_prot->release_cb(sk);
2406
c3f9b018 2407 sock_release_ownership(sk);
a5b5bb9a
IM		 2408 if (waitqueue_active(&sk->sk_lock.wq))
2409 wake_up(&sk->sk_lock.wq);
2410 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2411}
2412EXPORT_SYMBOL(release_sock);
2413
8a74ad60
ED		 2414/**
2415 * lock_sock_fast - fast version of lock_sock
2416 * @sk: socket
2417 *
2418 * This version should be used for very small section, where process wont block
2419 * return false if fast path is taken
2420 * sk_lock.slock locked, owned = 0, BH disabled
2421 * return true if slow path is taken
2422 * sk_lock.slock unlocked, owned = 1, BH enabled
2423 */
2424bool lock_sock_fast(struct sock *sk)
2425{
2426 might_sleep();
2427 spin_lock_bh(&sk->sk_lock.slock);
2428
2429 if (!sk->sk_lock.owned)
2430 /*
2431 * Note : We must disable BH
2432 */
2433 return false;
2434
2435 __lock_sock(sk);
2436 sk->sk_lock.owned = 1;
2437 spin_unlock(&sk->sk_lock.slock);
2438 /*
2439 * The sk_lock has mutex_lock() semantics here:
2440 */
2441 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2442 local_bh_enable();
2443 return true;
2444}
2445EXPORT_SYMBOL(lock_sock_fast);
2446
1da177e4 2447int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2448{
b7aa0bf7 2449 struct timeval tv;
1da177e4 2450 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2451 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2452 tv = ktime_to_timeval(sk->sk_stamp);
2453 if (tv.tv_sec == -1)
1da177e4 2454 return -ENOENT;
b7aa0bf7
ED		 2455 if (tv.tv_sec == 0) {
2456 sk->sk_stamp = ktime_get_real();
2457 tv = ktime_to_timeval(sk->sk_stamp);
2458 }
2459 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2460}
1da177e4
LT		 2461EXPORT_SYMBOL(sock_get_timestamp);
2462
ae40eb1e
ED		 2463int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2464{
2465 struct timespec ts;
2466 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2467 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2468 ts = ktime_to_timespec(sk->sk_stamp);
2469 if (ts.tv_sec == -1)
2470 return -ENOENT;
2471 if (ts.tv_sec == 0) {
2472 sk->sk_stamp = ktime_get_real();
2473 ts = ktime_to_timespec(sk->sk_stamp);
2474 }
2475 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2476}
2477EXPORT_SYMBOL(sock_get_timestampns);
2478
20d49473 2479void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2480{
20d49473 2481 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2482 unsigned long previous_flags = sk->sk_flags;
2483
20d49473
PO		 2484 sock_set_flag(sk, flag);
2485 /*
2486 * we just set one of the two flags which require net
2487 * time stamping, but time stamping might have been on
2488 * already because of the other one
2489 */
08e29af3 2490 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2491 net_enable_timestamp();
1da177e4
LT		 2492 }
2493}
1da177e4 2494
cb820f8e
RC		 2495int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2496 int level, int type)
2497{
2498 struct sock_exterr_skb *serr;
2499 struct sk_buff *skb, *skb2;
2500 int copied, err;
2501
2502 err = -EAGAIN;
2503 skb = skb_dequeue(&sk->sk_error_queue);
2504 if (skb == NULL)
2505 goto out;
2506
2507 copied = skb->len;
2508 if (copied > len) {
2509 msg->msg_flags |= MSG_TRUNC;
2510 copied = len;
2511 }
2512 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2513 if (err)
2514 goto out_free_skb;
2515
2516 sock_recv_timestamp(msg, sk, skb);
2517
2518 serr = SKB_EXT_ERR(skb);
2519 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2520
2521 msg->msg_flags |= MSG_ERRQUEUE;
2522 err = copied;
2523
2524 /* Reset and regenerate socket error */
2525 spin_lock_bh(&sk->sk_error_queue.lock);
2526 sk->sk_err = 0;
2527 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
2528 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
2529 spin_unlock_bh(&sk->sk_error_queue.lock);
2530 sk->sk_error_report(sk);
2531 } else
2532 spin_unlock_bh(&sk->sk_error_queue.lock);
2533
2534out_free_skb:
2535 kfree_skb(skb);
2536out:
2537 return err;
2538}
2539EXPORT_SYMBOL(sock_recv_errqueue);
2540
1da177e4
LT		 2541/*
2542 * Get a socket option on an socket.
2543 *
2544 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2545 * asynchronous errors should be reported by getsockopt. We assume
2546 * this means if you specify SO_ERROR (otherwise whats the point of it).
2547 */
2548int sock_common_getsockopt(struct socket *sock, int level, int optname,
2549 char __user *optval, int __user *optlen)
2550{
2551 struct sock *sk = sock->sk;
2552
2553 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2554}
1da177e4
LT		 2555EXPORT_SYMBOL(sock_common_getsockopt);
2556
3fdadf7d 2557#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2558int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2559 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2560{
2561 struct sock *sk = sock->sk;
2562
1e51f951 2563 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2564 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2565 optval, optlen);
3fdadf7d
DM		 2566 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2567}
2568EXPORT_SYMBOL(compat_sock_common_getsockopt);
2569#endif
2570
1da177e4
LT		 2571int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2572 struct msghdr *msg, size_t size, int flags)
2573{
2574 struct sock *sk = sock->sk;
2575 int addr_len = 0;
2576 int err;
2577
2578 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2579 flags & ~MSG_DONTWAIT, &addr_len);
2580 if (err >= 0)
2581 msg->msg_namelen = addr_len;
2582 return err;
2583}
1da177e4
LT		 2584EXPORT_SYMBOL(sock_common_recvmsg);
2585
2586/*
2587 * Set socket options on an inet socket.
2588 */
2589int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2590 char __user *optval, unsigned int optlen)
1da177e4
LT		 2591{
2592 struct sock *sk = sock->sk;
2593
2594 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2595}
1da177e4
LT		 2596EXPORT_SYMBOL(sock_common_setsockopt);
2597
3fdadf7d 2598#ifdef CONFIG_COMPAT
543d9cfe 2599int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2600 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2601{
2602 struct sock *sk = sock->sk;
2603
543d9cfe
ACM		 2604 if (sk->sk_prot->compat_setsockopt != NULL)
2605 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2606 optval, optlen);
3fdadf7d
DM		 2607 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2608}
2609EXPORT_SYMBOL(compat_sock_common_setsockopt);
2610#endif
2611
1da177e4
LT		 2612void sk_common_release(struct sock *sk)
2613{
2614 if (sk->sk_prot->destroy)
2615 sk->sk_prot->destroy(sk);
2616
2617 /*
2618 * Observation: when sock_common_release is called, processes have
2619 * no access to socket. But net still has.
2620 * Step one, detach it from networking:
2621 *
2622 * A. Remove from hash tables.
2623 */
2624
2625 sk->sk_prot->unhash(sk);
2626
2627 /*
2628 * In this point socket cannot receive new packets, but it is possible
2629 * that some packets are in flight because some CPU runs receiver and
2630 * did hash table lookup before we unhashed socket. They will achieve
2631 * receive queue and will be purged by socket destructor.
2632 *
2633 * Also we still have packets pending on receive queue and probably,
2634 * our own packets waiting in device queues. sock_destroy will drain
2635 * receive queue, but transmitted packets will delay socket destruction
2636 * until the last reference will be released.
2637 */
2638
2639 sock_orphan(sk);
2640
2641 xfrm_sk_free_policy(sk);
2642
e6848976 2643 sk_refcnt_debug_release(sk);
5640f768
ED		 2644
2645 if (sk->sk_frag.page) {
2646 put_page(sk->sk_frag.page);
2647 sk->sk_frag.page = NULL;
2648 }
2649
1da177e4
LT		 2650 sock_put(sk);
2651}
1da177e4
LT		 2652EXPORT_SYMBOL(sk_common_release);
2653
13ff3d6f
PE		 2654#ifdef CONFIG_PROC_FS
2655#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2656struct prot_inuse {
2657 int val[PROTO_INUSE_NR];
2658};
13ff3d6f
PE		 2659
2660static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2661
2662#ifdef CONFIG_NET_NS
2663void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2664{
d6d9ca0f 2665 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2666}
2667EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2668
2669int sock_prot_inuse_get(struct net *net, struct proto *prot)
2670{
2671 int cpu, idx = prot->inuse_idx;
2672 int res = 0;
2673
2674 for_each_possible_cpu(cpu)
2675 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2676
2677 return res >= 0 ? res : 0;
2678}
2679EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2680
2c8c1e72 2681static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2682{
2683 net->core.inuse = alloc_percpu(struct prot_inuse);
2684 return net->core.inuse ? 0 : -ENOMEM;
2685}
2686
2c8c1e72 2687static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2688{
2689 free_percpu(net->core.inuse);
2690}
2691
2692static struct pernet_operations net_inuse_ops = {
2693 .init = sock_inuse_init_net,
2694 .exit = sock_inuse_exit_net,
2695};
2696
2697static __init int net_inuse_init(void)
2698{
2699 if (register_pernet_subsys(&net_inuse_ops))
2700 panic("Cannot initialize net inuse counters");
2701
2702 return 0;
2703}
2704
2705core_initcall(net_inuse_init);
2706#else
1338d466
PE		 2707static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2708
c29a0bc4 2709void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2710{
d6d9ca0f 2711 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2712}
2713EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2714
c29a0bc4 2715int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2716{
2717 int cpu, idx = prot->inuse_idx;
2718 int res = 0;
2719
2720 for_each_possible_cpu(cpu)
2721 res += per_cpu(prot_inuse, cpu).val[idx];
2722
2723 return res >= 0 ? res : 0;
2724}
2725EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2726#endif
13ff3d6f
PE		 2727
2728static void assign_proto_idx(struct proto *prot)
2729{
2730 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2731
2732 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2733 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2734 return;
2735 }
2736
2737 set_bit(prot->inuse_idx, proto_inuse_idx);
2738}
2739
2740static void release_proto_idx(struct proto *prot)
2741{
2742 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2743 clear_bit(prot->inuse_idx, proto_inuse_idx);
2744}
2745#else
2746static inline void assign_proto_idx(struct proto *prot)
2747{
2748}
2749
2750static inline void release_proto_idx(struct proto *prot)
2751{
2752}
2753#endif
2754
b733c007
PE		 2755int proto_register(struct proto *prot, int alloc_slab)
2756{
1da177e4
LT		 2757 if (alloc_slab) {
2758 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2759 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2760 NULL);
1da177e4
LT		 2761
2762 if (prot->slab == NULL) {
e005d193
JP		 2763 pr_crit("%s: Can't create sock SLAB cache!\n",
2764 prot->name);
60e7663d 2765 goto out;
1da177e4 2766 }
2e6599cb
ACM		 2767
2768 if (prot->rsk_prot != NULL) {
faf23422 2769 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2770 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2771 goto out_free_sock_slab;
2772
7e56b5d6 2773 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2774 prot->rsk_prot->obj_size, 0,
20c2df83 2775 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2776
2777 if (prot->rsk_prot->slab == NULL) {
e005d193
JP		 2778 pr_crit("%s: Can't create request sock SLAB cache!\n",
2779 prot->name);
2e6599cb
ACM		 2780 goto out_free_request_sock_slab_name;
2781 }
2782 }
8feaf0c0 2783
6d6ee43e 2784 if (prot->twsk_prot != NULL) {
faf23422 2785 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2786
7e56b5d6 2787 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2788 goto out_free_request_sock_slab;
2789
6d6ee43e 2790 prot->twsk_prot->twsk_slab =
7e56b5d6 2791 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2792 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2793 0,
2794 SLAB_HWCACHE_ALIGN |
2795 prot->slab_flags,
20c2df83 2796 NULL);
6d6ee43e 2797 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2798 goto out_free_timewait_sock_slab_name;
2799 }
1da177e4
LT		 2800 }
2801
36b77a52 2802 mutex_lock(&proto_list_mutex);
1da177e4 2803 list_add(&prot->node, &proto_list);
13ff3d6f 2804 assign_proto_idx(prot);
36b77a52 2805 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2806 return 0;
2807
8feaf0c0 2808out_free_timewait_sock_slab_name:
7e56b5d6 2809 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2810out_free_request_sock_slab:
2811 if (prot->rsk_prot && prot->rsk_prot->slab) {
2812 kmem_cache_destroy(prot->rsk_prot->slab);
2813 prot->rsk_prot->slab = NULL;
2814 }
2e6599cb 2815out_free_request_sock_slab_name:
72150e9b
DC		 2816 if (prot->rsk_prot)
2817 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2818out_free_sock_slab:
2819 kmem_cache_destroy(prot->slab);
2820 prot->slab = NULL;
b733c007
PE		 2821out:
2822 return -ENOBUFS;
1da177e4 2823}
1da177e4
LT		 2824EXPORT_SYMBOL(proto_register);
2825
2826void proto_unregister(struct proto *prot)
2827{
36b77a52 2828 mutex_lock(&proto_list_mutex);
13ff3d6f 2829 release_proto_idx(prot);
0a3f4358 2830 list_del(&prot->node);
36b77a52 2831 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2832
2833 if (prot->slab != NULL) {
2834 kmem_cache_destroy(prot->slab);
2835 prot->slab = NULL;
2836 }
2837
2e6599cb 2838 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2839 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2840 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2841 prot->rsk_prot->slab = NULL;
2842 }
2843
6d6ee43e 2844 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2845 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2846 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2847 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2848 }
1da177e4 2849}
1da177e4
LT		 2850EXPORT_SYMBOL(proto_unregister);
2851
2852#ifdef CONFIG_PROC_FS
1da177e4 2853static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2854 __acquires(proto_list_mutex)
1da177e4 2855{
36b77a52 2856 mutex_lock(&proto_list_mutex);
60f0438a 2857 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2858}
2859
2860static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2861{
60f0438a 2862 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2863}
2864
2865static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2866 __releases(proto_list_mutex)
1da177e4 2867{
36b77a52 2868 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2869}
2870
2871static char proto_method_implemented(const void *method)
2872{
2873 return method == NULL ? 'n' : 'y';
2874}
180d8cd9
GC		 2875static long sock_prot_memory_allocated(struct proto *proto)
2876{
cb75a36c 2877 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2878}
2879
2880static char *sock_prot_memory_pressure(struct proto *proto)
2881{
2882 return proto->memory_pressure != NULL ?
2883 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2884}
1da177e4
LT		 2885
2886static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2887{
180d8cd9 2888
8d987e5c 2889 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2890 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2891 proto->name,
2892 proto->obj_size,
14e943db 2893 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2894 sock_prot_memory_allocated(proto),
2895 sock_prot_memory_pressure(proto),
1da177e4
LT		 2896 proto->max_header,
2897 proto->slab == NULL ? "no" : "yes",
2898 module_name(proto->owner),
2899 proto_method_implemented(proto->close),
2900 proto_method_implemented(proto->connect),
2901 proto_method_implemented(proto->disconnect),
2902 proto_method_implemented(proto->accept),
2903 proto_method_implemented(proto->ioctl),
2904 proto_method_implemented(proto->init),
2905 proto_method_implemented(proto->destroy),
2906 proto_method_implemented(proto->shutdown),
2907 proto_method_implemented(proto->setsockopt),
2908 proto_method_implemented(proto->getsockopt),
2909 proto_method_implemented(proto->sendmsg),
2910 proto_method_implemented(proto->recvmsg),
2911 proto_method_implemented(proto->sendpage),
2912 proto_method_implemented(proto->bind),
2913 proto_method_implemented(proto->backlog_rcv),
2914 proto_method_implemented(proto->hash),
2915 proto_method_implemented(proto->unhash),
2916 proto_method_implemented(proto->get_port),
2917 proto_method_implemented(proto->enter_memory_pressure));
2918}
2919
2920static int proto_seq_show(struct seq_file *seq, void *v)
2921{
60f0438a 2922 if (v == &proto_list)
1da177e4
LT		 2923 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2924 "protocol",
2925 "size",
2926 "sockets",
2927 "memory",
2928 "press",
2929 "maxhdr",
2930 "slab",
2931 "module",
2932 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2933 else
60f0438a 2934 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2935 return 0;
2936}
2937
f690808e 2938static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2939 .start = proto_seq_start,
2940 .next = proto_seq_next,
2941 .stop = proto_seq_stop,
2942 .show = proto_seq_show,
2943};
2944
2945static int proto_seq_open(struct inode *inode, struct file *file)
2946{
14e943db
ED		 2947 return seq_open_net(inode, file, &proto_seq_ops,
2948 sizeof(struct seq_net_private));
1da177e4
LT		 2949}
2950
9a32144e 2951static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2952 .owner = THIS_MODULE,
2953 .open = proto_seq_open,
2954 .read = seq_read,
2955 .llseek = seq_lseek,
14e943db
ED		 2956 .release = seq_release_net,
2957};
2958
2959static __net_init int proto_init_net(struct net *net)
2960{
d4beaa66 2961 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 2962 return -ENOMEM;
2963
2964 return 0;
2965}
2966
2967static __net_exit void proto_exit_net(struct net *net)
2968{
ece31ffd 2969 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 2970}
2971
2972
2973static __net_initdata struct pernet_operations proto_net_ops = {
2974 .init = proto_init_net,
2975 .exit = proto_exit_net,
1da177e4
LT		 2976};
2977
2978static int __init proto_init(void)
2979{
14e943db 2980 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2981}
2982
2983subsys_initcall(proto_init);
2984
2985#endif /* PROC_FS */
Linux kernel - Deliverables
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