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net-timestamp: Merge shared code between phy and regular timestamping
[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;
3b885787
NH		 440 unsigned long flags;
441 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 442
0fd7bac6 443 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 444 atomic_inc(&sk->sk_drops);
3847ce32 445 trace_sock_rcvqueue_full(sk, skb);
766e9037 446 return -ENOMEM;
f0088a50
DV		 447 }
448
fda9ef5d 449 err = sk_filter(sk, skb);
f0088a50 450 if (err)
766e9037 451 return err;
f0088a50 452
c76562b6 453 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 454 atomic_inc(&sk->sk_drops);
455 return -ENOBUFS;
3ab224be
HA		 456 }
457
f0088a50
DV		 458 skb->dev = NULL;
459 skb_set_owner_r(skb, sk);
49ad9599 460
7fee226a
ED		 461 /* we escape from rcu protected region, make sure we dont leak
462 * a norefcounted dst
463 */
464 skb_dst_force(skb);
465
3b885787
NH		 466 spin_lock_irqsave(&list->lock, flags);
467 skb->dropcount = atomic_read(&sk->sk_drops);
468 __skb_queue_tail(list, skb);
469 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 470
471 if (!sock_flag(sk, SOCK_DEAD))
676d2369 472 sk->sk_data_ready(sk);
766e9037 473 return 0;
f0088a50
DV		 474}
475EXPORT_SYMBOL(sock_queue_rcv_skb);
476
58a5a7b9 477int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 478{
479 int rc = NET_RX_SUCCESS;
480
fda9ef5d 481 if (sk_filter(sk, skb))
f0088a50
DV		 482 goto discard_and_relse;
483
484 skb->dev = NULL;
485
274f482d 486 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 487 atomic_inc(&sk->sk_drops);
488 goto discard_and_relse;
489 }
58a5a7b9
ACM		 490 if (nested)
491 bh_lock_sock_nested(sk);
492 else
493 bh_lock_sock(sk);
a5b5bb9a
IM		 494 if (!sock_owned_by_user(sk)) {
495 /*
496 * trylock + unlock semantics:
497 */
498 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
499
c57943a1 500 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 501
502 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 503 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 504 bh_unlock_sock(sk);
505 atomic_inc(&sk->sk_drops);
506 goto discard_and_relse;
507 }
508
f0088a50
DV		 509 bh_unlock_sock(sk);
510out:
511 sock_put(sk);
512 return rc;
513discard_and_relse:
514 kfree_skb(skb);
515 goto out;
516}
517EXPORT_SYMBOL(sk_receive_skb);
518
519struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
520{
b6c6712a 521 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 522
523 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 524 sk_tx_queue_clear(sk);
a9b3cd7f 525 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 526 dst_release(dst);
527 return NULL;
528 }
529
530 return dst;
531}
532EXPORT_SYMBOL(__sk_dst_check);
533
534struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
535{
536 struct dst_entry *dst = sk_dst_get(sk);
537
538 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
539 sk_dst_reset(sk);
540 dst_release(dst);
541 return NULL;
542 }
543
544 return dst;
545}
546EXPORT_SYMBOL(sk_dst_check);
547
c91f6df2
BH		 548static int sock_setbindtodevice(struct sock *sk, char __user *optval,
549 int optlen)
4878809f
DM		 550{
551 int ret = -ENOPROTOOPT;
552#ifdef CONFIG_NETDEVICES
3b1e0a65 553 struct net *net = sock_net(sk);
4878809f
DM		 554 char devname[IFNAMSIZ];
555 int index;
556
557 /* Sorry... */
558 ret = -EPERM;
5e1fccc0 559 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 560 goto out;
561
562 ret = -EINVAL;
563 if (optlen < 0)
564 goto out;
565
566 /* Bind this socket to a particular device like "eth0",
567 * as specified in the passed interface name. If the
568 * name is "" or the option length is zero the socket
569 * is not bound.
570 */
571 if (optlen > IFNAMSIZ - 1)
572 optlen = IFNAMSIZ - 1;
573 memset(devname, 0, sizeof(devname));
574
575 ret = -EFAULT;
576 if (copy_from_user(devname, optval, optlen))
577 goto out;
578
000ba2e4
DM		 579 index = 0;
580 if (devname[0] != '\0') {
bf8e56bf 581 struct net_device *dev;
4878809f 582
bf8e56bf
ED		 583 rcu_read_lock();
584 dev = dev_get_by_name_rcu(net, devname);
585 if (dev)
586 index = dev->ifindex;
587 rcu_read_unlock();
4878809f
DM		 588 ret = -ENODEV;
589 if (!dev)
590 goto out;
4878809f
DM		 591 }
592
593 lock_sock(sk);
594 sk->sk_bound_dev_if = index;
595 sk_dst_reset(sk);
596 release_sock(sk);
597
598 ret = 0;
599
600out:
601#endif
602
603 return ret;
604}
605
c91f6df2
BH		 606static int sock_getbindtodevice(struct sock *sk, char __user *optval,
607 int __user *optlen, int len)
608{
609 int ret = -ENOPROTOOPT;
610#ifdef CONFIG_NETDEVICES
611 struct net *net = sock_net(sk);
c91f6df2 612 char devname[IFNAMSIZ];
c91f6df2
BH		 613
614 if (sk->sk_bound_dev_if == 0) {
615 len = 0;
616 goto zero;
617 }
618
619 ret = -EINVAL;
620 if (len < IFNAMSIZ)
621 goto out;
622
5dbe7c17
NS		 623 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
624 if (ret)
c91f6df2 625 goto out;
c91f6df2
BH		 626
627 len = strlen(devname) + 1;
628
629 ret = -EFAULT;
630 if (copy_to_user(optval, devname, len))
631 goto out;
632
633zero:
634 ret = -EFAULT;
635 if (put_user(len, optlen))
636 goto out;
637
638 ret = 0;
639
640out:
641#endif
642
643 return ret;
644}
645
c0ef877b
PE		 646static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
647{
648 if (valbool)
649 sock_set_flag(sk, bit);
650 else
651 sock_reset_flag(sk, bit);
652}
653
1da177e4
LT		 654/*
655 * This is meant for all protocols to use and covers goings on
656 * at the socket level. Everything here is generic.
657 */
658
659int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 660 char __user *optval, unsigned int optlen)
1da177e4 661{
2a91525c 662 struct sock *sk = sock->sk;
1da177e4
LT		 663 int val;
664 int valbool;
665 struct linger ling;
666 int ret = 0;
4ec93edb 667
1da177e4
LT		 668 /*
669 * Options without arguments
670 */
671
4878809f 672 if (optname == SO_BINDTODEVICE)
c91f6df2 673 return sock_setbindtodevice(sk, optval, optlen);
4878809f 674
e71a4783
SH		 675 if (optlen < sizeof(int))
676 return -EINVAL;
4ec93edb 677
1da177e4
LT		 678 if (get_user(val, (int __user *)optval))
679 return -EFAULT;
4ec93edb 680
2a91525c 681 valbool = val ? 1 : 0;
1da177e4
LT		 682
683 lock_sock(sk);
684
2a91525c 685 switch (optname) {
e71a4783 686 case SO_DEBUG:
2a91525c 687 if (val && !capable(CAP_NET_ADMIN))
e71a4783 688 ret = -EACCES;
2a91525c 689 else
c0ef877b 690 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 691 break;
692 case SO_REUSEADDR:
4a17fd52 693 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 694 break;
055dc21a
TH		 695 case SO_REUSEPORT:
696 sk->sk_reuseport = valbool;
697 break;
e71a4783 698 case SO_TYPE:
49c794e9 699 case SO_PROTOCOL:
0d6038ee 700 case SO_DOMAIN:
e71a4783
SH		 701 case SO_ERROR:
702 ret = -ENOPROTOOPT;
703 break;
704 case SO_DONTROUTE:
c0ef877b 705 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 706 break;
707 case SO_BROADCAST:
708 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
709 break;
710 case SO_SNDBUF:
711 /* Don't error on this BSD doesn't and if you think
82981930
ED		 712 * about it this is right. Otherwise apps have to
713 * play 'guess the biggest size' games. RCVBUF/SNDBUF
714 * are treated in BSD as hints
715 */
716 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 717set_sndbuf:
e71a4783 718 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 719 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
720 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 721 sk->sk_write_space(sk);
722 break;
1da177e4 723
e71a4783
SH		 724 case SO_SNDBUFFORCE:
725 if (!capable(CAP_NET_ADMIN)) {
726 ret = -EPERM;
727 break;
728 }
729 goto set_sndbuf;
b0573dea 730
e71a4783
SH		 731 case SO_RCVBUF:
732 /* Don't error on this BSD doesn't and if you think
82981930
ED		 733 * about it this is right. Otherwise apps have to
734 * play 'guess the biggest size' games. RCVBUF/SNDBUF
735 * are treated in BSD as hints
736 */
737 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 738set_rcvbuf:
e71a4783
SH		 739 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
740 /*
741 * We double it on the way in to account for
742 * "struct sk_buff" etc. overhead. Applications
743 * assume that the SO_RCVBUF setting they make will
744 * allow that much actual data to be received on that
745 * socket.
746 *
747 * Applications are unaware that "struct sk_buff" and
748 * other overheads allocate from the receive buffer
749 * during socket buffer allocation.
750 *
751 * And after considering the possible alternatives,
752 * returning the value we actually used in getsockopt
753 * is the most desirable behavior.
754 */
82981930 755 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 756 break;
757
758 case SO_RCVBUFFORCE:
759 if (!capable(CAP_NET_ADMIN)) {
760 ret = -EPERM;
1da177e4 761 break;
e71a4783
SH		 762 }
763 goto set_rcvbuf;
1da177e4 764
e71a4783 765 case SO_KEEPALIVE:
1da177e4 766#ifdef CONFIG_INET
3e10986d
ED		 767 if (sk->sk_protocol == IPPROTO_TCP &&
768 sk->sk_type == SOCK_STREAM)
e71a4783 769 tcp_set_keepalive(sk, valbool);
1da177e4 770#endif
e71a4783
SH		 771 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
772 break;
773
774 case SO_OOBINLINE:
775 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
776 break;
777
778 case SO_NO_CHECK:
28448b80 779 sk->sk_no_check_tx = valbool;
e71a4783
SH		 780 break;
781
782 case SO_PRIORITY:
5e1fccc0
EB		 783 if ((val >= 0 && val <= 6) ||
784 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 785 sk->sk_priority = val;
786 else
787 ret = -EPERM;
788 break;
789
790 case SO_LINGER:
791 if (optlen < sizeof(ling)) {
792 ret = -EINVAL; /* 1003.1g */
1da177e4 793 break;
e71a4783 794 }
2a91525c 795 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 796 ret = -EFAULT;
1da177e4 797 break;
e71a4783
SH		 798 }
799 if (!ling.l_onoff)
800 sock_reset_flag(sk, SOCK_LINGER);
801 else {
1da177e4 802#if (BITS_PER_LONG == 32)
e71a4783
SH		 803 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
804 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 805 else
e71a4783
SH		 806#endif
807 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
808 sock_set_flag(sk, SOCK_LINGER);
809 }
810 break;
811
812 case SO_BSDCOMPAT:
813 sock_warn_obsolete_bsdism("setsockopt");
814 break;
815
816 case SO_PASSCRED:
817 if (valbool)
818 set_bit(SOCK_PASSCRED, &sock->flags);
819 else
820 clear_bit(SOCK_PASSCRED, &sock->flags);
821 break;
822
823 case SO_TIMESTAMP:
92f37fd2 824 case SO_TIMESTAMPNS:
e71a4783 825 if (valbool) {
92f37fd2
ED		 826 if (optname == SO_TIMESTAMP)
827 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
828 else
829 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 830 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 831 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 832 } else {
e71a4783 833 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 834 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
835 }
e71a4783
SH		 836 break;
837
20d49473
PO		 838 case SO_TIMESTAMPING:
839 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 840 ret = -EINVAL;
20d49473
PO		 841 break;
842 }
09c2d251 843 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765
WB		 844 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
845 if (sk->sk_protocol == IPPROTO_TCP) {
846 if (sk->sk_state != TCP_ESTABLISHED) {
847 ret = -EINVAL;
848 break;
849 }
850 sk->sk_tskey = tcp_sk(sk)->snd_una;
851 } else {
852 sk->sk_tskey = 0;
853 }
854 }
b9f40e21 855 sk->sk_tsflags = val;
20d49473
PO		 856 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
857 sock_enable_timestamp(sk,
858 SOCK_TIMESTAMPING_RX_SOFTWARE);
859 else
860 sock_disable_timestamp(sk,
08e29af3 861 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 862 break;
863
e71a4783
SH		 864 case SO_RCVLOWAT:
865 if (val < 0)
866 val = INT_MAX;
867 sk->sk_rcvlowat = val ? : 1;
868 break;
869
870 case SO_RCVTIMEO:
871 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
872 break;
873
874 case SO_SNDTIMEO:
875 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
876 break;
1da177e4 877
e71a4783
SH		 878 case SO_ATTACH_FILTER:
879 ret = -EINVAL;
880 if (optlen == sizeof(struct sock_fprog)) {
881 struct sock_fprog fprog;
1da177e4 882
e71a4783
SH		 883 ret = -EFAULT;
884 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 885 break;
e71a4783
SH		 886
887 ret = sk_attach_filter(&fprog, sk);
888 }
889 break;
890
891 case SO_DETACH_FILTER:
55b33325 892 ret = sk_detach_filter(sk);
e71a4783 893 break;
1da177e4 894
d59577b6
VB		 895 case SO_LOCK_FILTER:
896 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
897 ret = -EPERM;
898 else
899 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
900 break;
901
e71a4783
SH		 902 case SO_PASSSEC:
903 if (valbool)
904 set_bit(SOCK_PASSSEC, &sock->flags);
905 else
906 clear_bit(SOCK_PASSSEC, &sock->flags);
907 break;
4a19ec58 908 case SO_MARK:
5e1fccc0 909 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 910 ret = -EPERM;
2a91525c 911 else
4a19ec58 912 sk->sk_mark = val;
4a19ec58 913 break;
877ce7c1 914
1da177e4
LT		 915 /* We implement the SO_SNDLOWAT etc to
916 not be settable (1003.1g 5.3) */
3b885787 917 case SO_RXQ_OVFL:
8083f0fc 918 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 919 break;
6e3e939f
JB		 920
921 case SO_WIFI_STATUS:
922 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
923 break;
924
ef64a54f
PE		 925 case SO_PEEK_OFF:
926 if (sock->ops->set_peek_off)
12663bfc 927 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 928 else
929 ret = -EOPNOTSUPP;
930 break;
3bdc0eba
BG		 931
932 case SO_NOFCS:
933 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
934 break;
935
7d4c04fc
KJ		 936 case SO_SELECT_ERR_QUEUE:
937 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
938 break;
939
e0d1095a 940#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 941 case SO_BUSY_POLL:
dafcc438
ET		 942 /* allow unprivileged users to decrease the value */
943 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
944 ret = -EPERM;
945 else {
946 if (val < 0)
947 ret = -EINVAL;
948 else
949 sk->sk_ll_usec = val;
950 }
951 break;
952#endif
62748f32
ED		 953
954 case SO_MAX_PACING_RATE:
955 sk->sk_max_pacing_rate = val;
956 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
957 sk->sk_max_pacing_rate);
958 break;
959
e71a4783
SH		 960 default:
961 ret = -ENOPROTOOPT;
962 break;
4ec93edb 963 }
1da177e4
LT		 964 release_sock(sk);
965 return ret;
966}
2a91525c 967EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 968
969
8f09898b 970static void cred_to_ucred(struct pid *pid, const struct cred *cred,
971 struct ucred *ucred)
3f551f94
EB		 972{
973 ucred->pid = pid_vnr(pid);
974 ucred->uid = ucred->gid = -1;
975 if (cred) {
976 struct user_namespace *current_ns = current_user_ns();
977
b2e4f544
EB		 978 ucred->uid = from_kuid_munged(current_ns, cred->euid);
979 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 980 }
981}
982
1da177e4
LT		 983int sock_getsockopt(struct socket *sock, int level, int optname,
984 char __user *optval, int __user *optlen)
985{
986 struct sock *sk = sock->sk;
4ec93edb 987
e71a4783 988 union {
4ec93edb
YH		 989 int val;
990 struct linger ling;
1da177e4
LT		 991 struct timeval tm;
992 } v;
4ec93edb 993
4d0392be 994 int lv = sizeof(int);
1da177e4 995 int len;
4ec93edb 996
e71a4783 997 if (get_user(len, optlen))
4ec93edb 998 return -EFAULT;
e71a4783 999 if (len < 0)
1da177e4 1000 return -EINVAL;
4ec93edb 1001
50fee1de 1002 memset(&v, 0, sizeof(v));
df0bca04 1003
2a91525c 1004 switch (optname) {
e71a4783
SH		 1005 case SO_DEBUG:
1006 v.val = sock_flag(sk, SOCK_DBG);
1007 break;
1008
1009 case SO_DONTROUTE:
1010 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1011 break;
1012
1013 case SO_BROADCAST:
1b23a5df 1014 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1015 break;
1016
1017 case SO_SNDBUF:
1018 v.val = sk->sk_sndbuf;
1019 break;
1020
1021 case SO_RCVBUF:
1022 v.val = sk->sk_rcvbuf;
1023 break;
1024
1025 case SO_REUSEADDR:
1026 v.val = sk->sk_reuse;
1027 break;
1028
055dc21a
TH		 1029 case SO_REUSEPORT:
1030 v.val = sk->sk_reuseport;
1031 break;
1032
e71a4783 1033 case SO_KEEPALIVE:
1b23a5df 1034 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1035 break;
1036
1037 case SO_TYPE:
1038 v.val = sk->sk_type;
1039 break;
1040
49c794e9
JE		 1041 case SO_PROTOCOL:
1042 v.val = sk->sk_protocol;
1043 break;
1044
0d6038ee
JE		 1045 case SO_DOMAIN:
1046 v.val = sk->sk_family;
1047 break;
1048
e71a4783
SH		 1049 case SO_ERROR:
1050 v.val = -sock_error(sk);
2a91525c 1051 if (v.val == 0)
e71a4783
SH		 1052 v.val = xchg(&sk->sk_err_soft, 0);
1053 break;
1054
1055 case SO_OOBINLINE:
1b23a5df 1056 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1057 break;
1058
1059 case SO_NO_CHECK:
28448b80 1060 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1061 break;
1062
1063 case SO_PRIORITY:
1064 v.val = sk->sk_priority;
1065 break;
1066
1067 case SO_LINGER:
1068 lv = sizeof(v.ling);
1b23a5df 1069 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1070 v.ling.l_linger = sk->sk_lingertime / HZ;
1071 break;
1072
1073 case SO_BSDCOMPAT:
1074 sock_warn_obsolete_bsdism("getsockopt");
1075 break;
1076
1077 case SO_TIMESTAMP:
92f37fd2
ED		 1078 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1079 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1080 break;
1081
1082 case SO_TIMESTAMPNS:
1083 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1084 break;
1085
20d49473 1086 case SO_TIMESTAMPING:
b9f40e21 1087 v.val = sk->sk_tsflags;
20d49473
PO		 1088 break;
1089
e71a4783 1090 case SO_RCVTIMEO:
2a91525c 1091 lv = sizeof(struct timeval);
e71a4783
SH		 1092 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1093 v.tm.tv_sec = 0;
1094 v.tm.tv_usec = 0;
1095 } else {
1096 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1097 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1098 }
1099 break;
1100
1101 case SO_SNDTIMEO:
2a91525c 1102 lv = sizeof(struct timeval);
e71a4783
SH		 1103 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1104 v.tm.tv_sec = 0;
1105 v.tm.tv_usec = 0;
1106 } else {
1107 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1108 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1109 }
1110 break;
1da177e4 1111
e71a4783
SH		 1112 case SO_RCVLOWAT:
1113 v.val = sk->sk_rcvlowat;
1114 break;
1da177e4 1115
e71a4783 1116 case SO_SNDLOWAT:
2a91525c 1117 v.val = 1;
e71a4783 1118 break;
1da177e4 1119
e71a4783 1120 case SO_PASSCRED:
82981930 1121 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1122 break;
1da177e4 1123
e71a4783 1124 case SO_PEERCRED:
109f6e39
EB		 1125 {
1126 struct ucred peercred;
1127 if (len > sizeof(peercred))
1128 len = sizeof(peercred);
1129 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1130 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1131 return -EFAULT;
1132 goto lenout;
109f6e39 1133 }
1da177e4 1134
e71a4783
SH		 1135 case SO_PEERNAME:
1136 {
1137 char address[128];
1138
1139 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1140 return -ENOTCONN;
1141 if (lv < len)
1142 return -EINVAL;
1143 if (copy_to_user(optval, address, len))
1144 return -EFAULT;
1145 goto lenout;
1146 }
1da177e4 1147
e71a4783
SH		 1148 /* Dubious BSD thing... Probably nobody even uses it, but
1149 * the UNIX standard wants it for whatever reason... -DaveM
1150 */
1151 case SO_ACCEPTCONN:
1152 v.val = sk->sk_state == TCP_LISTEN;
1153 break;
1da177e4 1154
e71a4783 1155 case SO_PASSSEC:
82981930 1156 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1157 break;
877ce7c1 1158
e71a4783
SH		 1159 case SO_PEERSEC:
1160 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1161
4a19ec58
LAT		 1162 case SO_MARK:
1163 v.val = sk->sk_mark;
1164 break;
1165
3b885787 1166 case SO_RXQ_OVFL:
1b23a5df 1167 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1168 break;
1169
6e3e939f 1170 case SO_WIFI_STATUS:
1b23a5df 1171 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1172 break;
1173
ef64a54f
PE		 1174 case SO_PEEK_OFF:
1175 if (!sock->ops->set_peek_off)
1176 return -EOPNOTSUPP;
1177
1178 v.val = sk->sk_peek_off;
1179 break;
bc2f7996 1180 case SO_NOFCS:
1b23a5df 1181 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1182 break;
c91f6df2 1183
f7b86bfe 1184 case SO_BINDTODEVICE:
c91f6df2
BH		 1185 return sock_getbindtodevice(sk, optval, optlen, len);
1186
a8fc9277
PE		 1187 case SO_GET_FILTER:
1188 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1189 if (len < 0)
1190 return len;
1191
1192 goto lenout;
c91f6df2 1193
d59577b6
VB		 1194 case SO_LOCK_FILTER:
1195 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1196 break;
1197
ea02f941
MS		 1198 case SO_BPF_EXTENSIONS:
1199 v.val = bpf_tell_extensions();
1200 break;
1201
7d4c04fc
KJ		 1202 case SO_SELECT_ERR_QUEUE:
1203 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1204 break;
1205
e0d1095a 1206#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1207 case SO_BUSY_POLL:
dafcc438
ET		 1208 v.val = sk->sk_ll_usec;
1209 break;
1210#endif
1211
62748f32
ED		 1212 case SO_MAX_PACING_RATE:
1213 v.val = sk->sk_max_pacing_rate;
1214 break;
1215
e71a4783
SH		 1216 default:
1217 return -ENOPROTOOPT;
1da177e4 1218 }
e71a4783 1219
1da177e4
LT		 1220 if (len > lv)
1221 len = lv;
1222 if (copy_to_user(optval, &v, len))
1223 return -EFAULT;
1224lenout:
4ec93edb
YH		 1225 if (put_user(len, optlen))
1226 return -EFAULT;
1227 return 0;
1da177e4
LT		 1228}
1229
a5b5bb9a
IM		 1230/*
1231 * Initialize an sk_lock.
1232 *
1233 * (We also register the sk_lock with the lock validator.)
1234 */
b6f99a21 1235static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1236{
ed07536e
PZ		 1237 sock_lock_init_class_and_name(sk,
1238 af_family_slock_key_strings[sk->sk_family],
1239 af_family_slock_keys + sk->sk_family,
1240 af_family_key_strings[sk->sk_family],
1241 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1242}
1243
4dc6dc71
ED		 1244/*
1245 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1246 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1247 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1248 */
f1a6c4da
PE		 1249static void sock_copy(struct sock *nsk, const struct sock *osk)
1250{
1251#ifdef CONFIG_SECURITY_NETWORK
1252 void *sptr = nsk->sk_security;
1253#endif
68835aba
ED		 1254 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1255
1256 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1257 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1258
f1a6c4da
PE		 1259#ifdef CONFIG_SECURITY_NETWORK
1260 nsk->sk_security = sptr;
1261 security_sk_clone(osk, nsk);
1262#endif
1263}
1264
fcbdf09d
OP		 1265void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1266{
1267 unsigned long nulls1, nulls2;
1268
1269 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1270 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1271 if (nulls1 > nulls2)
1272 swap(nulls1, nulls2);
1273
1274 if (nulls1 != 0)
1275 memset((char *)sk, 0, nulls1);
1276 memset((char *)sk + nulls1 + sizeof(void *), 0,
1277 nulls2 - nulls1 - sizeof(void *));
1278 memset((char *)sk + nulls2 + sizeof(void *), 0,
1279 size - nulls2 - sizeof(void *));
1280}
1281EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1282
2e4afe7b
PE		 1283static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1284 int family)
c308c1b2
PE		 1285{
1286 struct sock *sk;
1287 struct kmem_cache *slab;
1288
1289 slab = prot->slab;
e912b114
ED		 1290 if (slab != NULL) {
1291 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1292 if (!sk)
1293 return sk;
1294 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1295 if (prot->clear_sk)
1296 prot->clear_sk(sk, prot->obj_size);
1297 else
1298 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1299 }
fcbdf09d 1300 } else
c308c1b2
PE		 1301 sk = kmalloc(prot->obj_size, priority);
1302
2e4afe7b 1303 if (sk != NULL) {
a98b65a3
VN		 1304 kmemcheck_annotate_bitfield(sk, flags);
1305
2e4afe7b
PE		 1306 if (security_sk_alloc(sk, family, priority))
1307 goto out_free;
1308
1309 if (!try_module_get(prot->owner))
1310 goto out_free_sec;
e022f0b4 1311 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1312 }
1313
c308c1b2 1314 return sk;
2e4afe7b
PE		 1315
1316out_free_sec:
1317 security_sk_free(sk);
1318out_free:
1319 if (slab != NULL)
1320 kmem_cache_free(slab, sk);
1321 else
1322 kfree(sk);
1323 return NULL;
c308c1b2
PE		 1324}
1325
1326static void sk_prot_free(struct proto *prot, struct sock *sk)
1327{
1328 struct kmem_cache *slab;
2e4afe7b 1329 struct module *owner;
c308c1b2 1330
2e4afe7b 1331 owner = prot->owner;
c308c1b2 1332 slab = prot->slab;
2e4afe7b
PE		 1333
1334 security_sk_free(sk);
c308c1b2
PE		 1335 if (slab != NULL)
1336 kmem_cache_free(slab, sk);
1337 else
1338 kfree(sk);
2e4afe7b 1339 module_put(owner);
c308c1b2
PE		 1340}
1341
86f8515f 1342#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
6ffd4641 1343void sock_update_netprioidx(struct sock *sk)
5bc1421e 1344{
5bc1421e
NH		 1345 if (in_interrupt())
1346 return;
2b73bc65 1347
6ffd4641 1348 sk->sk_cgrp_prioidx = task_netprioidx(current);
5bc1421e
NH		 1349}
1350EXPORT_SYMBOL_GPL(sock_update_netprioidx);
f8451725
HX		 1351#endif
1352
1da177e4
LT		 1353/**
1354 * sk_alloc - All socket objects are allocated here
c4ea43c5 1355 * @net: the applicable net namespace
4dc3b16b
PP		 1356 * @family: protocol family
1357 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1358 * @prot: struct proto associated with this new sock instance
1da177e4 1359 */
1b8d7ae4 1360struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1361 struct proto *prot)
1da177e4 1362{
c308c1b2 1363 struct sock *sk;
1da177e4 1364
154adbc8 1365 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1366 if (sk) {
154adbc8
PE		 1367 sk->sk_family = family;
1368 /*
1369 * See comment in struct sock definition to understand
1370 * why we need sk_prot_creator -acme
1371 */
1372 sk->sk_prot = sk->sk_prot_creator = prot;
1373 sock_lock_init(sk);
3b1e0a65 1374 sock_net_set(sk, get_net(net));
d66ee058 1375 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1376
211d2f97 1377 sock_update_classid(sk);
6ffd4641 1378 sock_update_netprioidx(sk);
1da177e4 1379 }
a79af59e 1380
2e4afe7b 1381 return sk;
1da177e4 1382}
2a91525c 1383EXPORT_SYMBOL(sk_alloc);
1da177e4 1384
2b85a34e 1385static void __sk_free(struct sock *sk)
1da177e4
LT		 1386{
1387 struct sk_filter *filter;
1da177e4
LT		 1388
1389 if (sk->sk_destruct)
1390 sk->sk_destruct(sk);
1391
a898def2
PM		 1392 filter = rcu_dereference_check(sk->sk_filter,
1393 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1394 if (filter) {
309dd5fc 1395 sk_filter_uncharge(sk, filter);
a9b3cd7f 1396 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1397 }
1398
08e29af3 1399 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1400
1401 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1402 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1403 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1404
109f6e39
EB		 1405 if (sk->sk_peer_cred)
1406 put_cred(sk->sk_peer_cred);
1407 put_pid(sk->sk_peer_pid);
3b1e0a65 1408 put_net(sock_net(sk));
c308c1b2 1409 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1410}
2b85a34e
ED		 1411
1412void sk_free(struct sock *sk)
1413{
1414 /*
25985edc 1415 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1416 * some packets are still in some tx queue.
1417 * If not null, sock_wfree() will call __sk_free(sk) later
1418 */
1419 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1420 __sk_free(sk);
1421}
2a91525c 1422EXPORT_SYMBOL(sk_free);
1da177e4 1423
edf02087 1424/*
25985edc
LDM		 1425 * Last sock_put should drop reference to sk->sk_net. It has already
1426 * been dropped in sk_change_net. Taking reference to stopping namespace
edf02087 1427 * is not an option.
25985edc 1428 * Take reference to a socket to remove it from hash _alive_ and after that
edf02087
DL		 1429 * destroy it in the context of init_net.
1430 */
1431void sk_release_kernel(struct sock *sk)
1432{
1433 if (sk == NULL || sk->sk_socket == NULL)
1434 return;
1435
1436 sock_hold(sk);
1437 sock_release(sk->sk_socket);
65a18ec5 1438 release_net(sock_net(sk));
3b1e0a65 1439 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1440 sock_put(sk);
1441}
45af1754 1442EXPORT_SYMBOL(sk_release_kernel);
edf02087 1443
475f1b52
SR		 1444static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1445{
1446 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1447 sock_update_memcg(newsk);
1448}
1449
e56c57d0
ED		 1450/**
1451 * sk_clone_lock - clone a socket, and lock its clone
1452 * @sk: the socket to clone
1453 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1454 *
1455 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1456 */
1457struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1458{
8fd1d178 1459 struct sock *newsk;
278571ba 1460 bool is_charged = true;
87d11ceb 1461
8fd1d178 1462 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1463 if (newsk != NULL) {
1464 struct sk_filter *filter;
1465
892c141e 1466 sock_copy(newsk, sk);
87d11ceb
ACM		 1467
1468 /* SANITY */
3b1e0a65 1469 get_net(sock_net(newsk));
87d11ceb
ACM		 1470 sk_node_init(&newsk->sk_node);
1471 sock_lock_init(newsk);
1472 bh_lock_sock(newsk);
fa438ccf 1473 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1474 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1475
1476 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1477 /*
1478 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1479 */
1480 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1481 atomic_set(&newsk->sk_omem_alloc, 0);
1482 skb_queue_head_init(&newsk->sk_receive_queue);
1483 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1484#ifdef CONFIG_NET_DMA
1485 skb_queue_head_init(&newsk->sk_async_wait_queue);
1486#endif
87d11ceb 1487
b6c6712a 1488 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1489 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1490 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1491 af_callback_keys + newsk->sk_family,
1492 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1493
1494 newsk->sk_dst_cache = NULL;
1495 newsk->sk_wmem_queued = 0;
1496 newsk->sk_forward_alloc = 0;
1497 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1498 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1499
1500 sock_reset_flag(newsk, SOCK_DONE);
1501 skb_queue_head_init(&newsk->sk_error_queue);
1502
0d7da9dd 1503 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb 1504 if (filter != NULL)
278571ba
AS		 1505 /* though it's an empty new sock, the charging may fail
1506 * if sysctl_optmem_max was changed between creation of
1507 * original socket and cloning
1508 */
1509 is_charged = sk_filter_charge(newsk, filter);
87d11ceb 1510
278571ba 1511 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk))) {
87d11ceb
ACM		 1512 /* It is still raw copy of parent, so invalidate
1513 * destructor and make plain sk_free() */
1514 newsk->sk_destruct = NULL;
b0691c8e 1515 bh_unlock_sock(newsk);
87d11ceb
ACM		 1516 sk_free(newsk);
1517 newsk = NULL;
1518 goto out;
1519 }
1520
1521 newsk->sk_err = 0;
1522 newsk->sk_priority = 0;
4dc6dc71
ED		 1523 /*
1524 * Before updating sk_refcnt, we must commit prior changes to memory
1525 * (Documentation/RCU/rculist_nulls.txt for details)
1526 */
1527 smp_wmb();
87d11ceb
ACM		 1528 atomic_set(&newsk->sk_refcnt, 2);
1529
1530 /*
1531 * Increment the counter in the same struct proto as the master
1532 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1533 * is the same as sk->sk_prot->socks, as this field was copied
1534 * with memcpy).
1535 *
1536 * This _changes_ the previous behaviour, where
1537 * tcp_create_openreq_child always was incrementing the
1538 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1539 * to be taken into account in all callers. -acme
1540 */
1541 sk_refcnt_debug_inc(newsk);
972692e0 1542 sk_set_socket(newsk, NULL);
43815482 1543 newsk->sk_wq = NULL;
87d11ceb 1544
f3f511e1
GC		 1545 sk_update_clone(sk, newsk);
1546
87d11ceb 1547 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1548 sk_sockets_allocated_inc(newsk);
704da560 1549
08e29af3 1550 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1551 net_enable_timestamp();
87d11ceb
ACM		 1552 }
1553out:
1554 return newsk;
1555}
e56c57d0 1556EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1557
9958089a
AK		 1558void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1559{
1560 __sk_dst_set(sk, dst);
1561 sk->sk_route_caps = dst->dev->features;
1562 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1563 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1564 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1565 if (sk_can_gso(sk)) {
82cc1a7a 1566 if (dst->header_len) {
9958089a 1567 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1568 } else {
9958089a 1569 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1570 sk->sk_gso_max_size = dst->dev->gso_max_size;
1485348d 1571 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
82cc1a7a 1572 }
9958089a
AK		 1573 }
1574}
1575EXPORT_SYMBOL_GPL(sk_setup_caps);
1576
1da177e4
LT		 1577/*
1578 * Simple resource managers for sockets.
1579 */
1580
1581
4ec93edb
YH		 1582/*
1583 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1584 */
1585void sock_wfree(struct sk_buff *skb)
1586{
1587 struct sock *sk = skb->sk;
d99927f4 1588 unsigned int len = skb->truesize;
1da177e4 1589
d99927f4
ED		 1590 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1591 /*
1592 * Keep a reference on sk_wmem_alloc, this will be released
1593 * after sk_write_space() call
1594 */
1595 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1596 sk->sk_write_space(sk);
d99927f4
ED		 1597 len = 1;
1598 }
2b85a34e 1599 /*
d99927f4
ED		 1600 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1601 * could not do because of in-flight packets
2b85a34e 1602 */
d99927f4 1603 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1604 __sk_free(sk);
1da177e4 1605}
2a91525c 1606EXPORT_SYMBOL(sock_wfree);
1da177e4 1607
f2f872f9
ED		 1608void skb_orphan_partial(struct sk_buff *skb)
1609{
1610 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1611 * so we do not completely orphan skb, but transfert all
1612 * accounted bytes but one, to avoid unexpected reorders.
1613 */
1614 if (skb->destructor == sock_wfree
1615#ifdef CONFIG_INET
1616 || skb->destructor == tcp_wfree
1617#endif
1618 ) {
1619 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1620 skb->truesize = 1;
1621 } else {
1622 skb_orphan(skb);
1623 }
1624}
1625EXPORT_SYMBOL(skb_orphan_partial);
1626
4ec93edb
YH		 1627/*
1628 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1629 */
1630void sock_rfree(struct sk_buff *skb)
1631{
1632 struct sock *sk = skb->sk;
d361fd59 1633 unsigned int len = skb->truesize;
1da177e4 1634
d361fd59
ED		 1635 atomic_sub(len, &sk->sk_rmem_alloc);
1636 sk_mem_uncharge(sk, len);
1da177e4 1637}
2a91525c 1638EXPORT_SYMBOL(sock_rfree);
1da177e4 1639
41063e9d
DM		 1640void sock_edemux(struct sk_buff *skb)
1641{
e812347c
ED		 1642 struct sock *sk = skb->sk;
1643
1c463e57 1644#ifdef CONFIG_INET
e812347c
ED		 1645 if (sk->sk_state == TCP_TIME_WAIT)
1646 inet_twsk_put(inet_twsk(sk));
1647 else
1c463e57 1648#endif
e812347c 1649 sock_put(sk);
41063e9d
DM		 1650}
1651EXPORT_SYMBOL(sock_edemux);
1da177e4 1652
976d0201 1653kuid_t sock_i_uid(struct sock *sk)
1da177e4 1654{
976d0201 1655 kuid_t uid;
1da177e4 1656
f064af1e 1657 read_lock_bh(&sk->sk_callback_lock);
976d0201 1658 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1659 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1660 return uid;
1661}
2a91525c 1662EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1663
1664unsigned long sock_i_ino(struct sock *sk)
1665{
1666 unsigned long ino;
1667
f064af1e 1668 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1669 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1670 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1671 return ino;
1672}
2a91525c 1673EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1674
1675/*
1676 * Allocate a skb from the socket's send buffer.
1677 */
86a76caf 1678struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1679 gfp_t priority)
1da177e4
LT		 1680{
1681 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1682 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1683 if (skb) {
1684 skb_set_owner_w(skb, sk);
1685 return skb;
1686 }
1687 }
1688 return NULL;
1689}
2a91525c 1690EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1691
4ec93edb 1692/*
1da177e4 1693 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1694 */
dd0fc66f 1695void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1696{
95c96174 1697 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1698 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1699 void *mem;
1700 /* First do the add, to avoid the race if kmalloc
4ec93edb 1701 * might sleep.
1da177e4
LT		 1702 */
1703 atomic_add(size, &sk->sk_omem_alloc);
1704 mem = kmalloc(size, priority);
1705 if (mem)
1706 return mem;
1707 atomic_sub(size, &sk->sk_omem_alloc);
1708 }
1709 return NULL;
1710}
2a91525c 1711EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1712
1713/*
1714 * Free an option memory block.
1715 */
1716void sock_kfree_s(struct sock *sk, void *mem, int size)
1717{
1718 kfree(mem);
1719 atomic_sub(size, &sk->sk_omem_alloc);
1720}
2a91525c 1721EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1722
1723/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1724 I think, these locks should be removed for datagram sockets.
1725 */
2a91525c 1726static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1727{
1728 DEFINE_WAIT(wait);
1729
1730 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1731 for (;;) {
1732 if (!timeo)
1733 break;
1734 if (signal_pending(current))
1735 break;
1736 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1737 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1738 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1739 break;
1740 if (sk->sk_shutdown & SEND_SHUTDOWN)
1741 break;
1742 if (sk->sk_err)
1743 break;
1744 timeo = schedule_timeout(timeo);
1745 }
aa395145 1746 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1747 return timeo;
1748}
1749
1750
1751/*
1752 * Generic send/receive buffer handlers
1753 */
1754
4cc7f68d
HX		 1755struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1756 unsigned long data_len, int noblock,
28d64271 1757 int *errcode, int max_page_order)
1da177e4 1758{
28d64271
ED		 1759 struct sk_buff *skb = NULL;
1760 unsigned long chunk;
7d877f3b 1761 gfp_t gfp_mask;
1da177e4
LT		 1762 long timeo;
1763 int err;
cc9b17ad 1764 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
28d64271
ED		 1765 struct page *page;
1766 int i;
cc9b17ad
JW		 1767
1768 err = -EMSGSIZE;
1769 if (npages > MAX_SKB_FRAGS)
1770 goto failure;
1da177e4 1771
1da177e4 1772 timeo = sock_sndtimeo(sk, noblock);
28d64271 1773 while (!skb) {
1da177e4
LT		 1774 err = sock_error(sk);
1775 if (err != 0)
1776 goto failure;
1777
1778 err = -EPIPE;
1779 if (sk->sk_shutdown & SEND_SHUTDOWN)
1780 goto failure;
1781
28d64271
ED		 1782 if (atomic_read(&sk->sk_wmem_alloc) >= sk->sk_sndbuf) {
1783 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1784 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1785 err = -EAGAIN;
1786 if (!timeo)
1787 goto failure;
1788 if (signal_pending(current))
1789 goto interrupted;
1790 timeo = sock_wait_for_wmem(sk, timeo);
1791 continue;
1792 }
1da177e4 1793
28d64271
ED		 1794 err = -ENOBUFS;
1795 gfp_mask = sk->sk_allocation;
1796 if (gfp_mask & __GFP_WAIT)
1797 gfp_mask |= __GFP_REPEAT;
1798
1799 skb = alloc_skb(header_len, gfp_mask);
1800 if (!skb)
1da177e4 1801 goto failure;
28d64271
ED		 1802
1803 skb->truesize += data_len;
1804
1805 for (i = 0; npages > 0; i++) {
1806 int order = max_page_order;
1807
1808 while (order) {
1809 if (npages >= 1 << order) {
1810 page = alloc_pages(sk->sk_allocation |
ed98df33
ED		 1811 __GFP_COMP |
1812 __GFP_NOWARN |
1813 __GFP_NORETRY,
28d64271
ED		 1814 order);
1815 if (page)
1816 goto fill_page;
1817 }
1818 order--;
1819 }
1820 page = alloc_page(sk->sk_allocation);
1821 if (!page)
1822 goto failure;
1823fill_page:
1824 chunk = min_t(unsigned long, data_len,
1825 PAGE_SIZE << order);
1826 skb_fill_page_desc(skb, i, page, 0, chunk);
1827 data_len -= chunk;
1828 npages -= 1 << order;
1da177e4 1829 }
1da177e4
LT		 1830 }
1831
1832 skb_set_owner_w(skb, sk);
1833 return skb;
1834
1835interrupted:
1836 err = sock_intr_errno(timeo);
1837failure:
28d64271 1838 kfree_skb(skb);
1da177e4
LT		 1839 *errcode = err;
1840 return NULL;
1841}
4cc7f68d 1842EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1843
4ec93edb 1844struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1845 int noblock, int *errcode)
1846{
28d64271 1847 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1848}
2a91525c 1849EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1850
5640f768
ED		 1851/* On 32bit arches, an skb frag is limited to 2^15 */
1852#define SKB_FRAG_PAGE_ORDER get_order(32768)
1853
400dfd3a
ED		 1854/**
1855 * skb_page_frag_refill - check that a page_frag contains enough room
1856 * @sz: minimum size of the fragment we want to get
1857 * @pfrag: pointer to page_frag
1858 * @prio: priority for memory allocation
1859 *
1860 * Note: While this allocator tries to use high order pages, there is
1861 * no guarantee that allocations succeed. Therefore, @sz MUST be
1862 * less or equal than PAGE_SIZE.
1863 */
1864bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t prio)
5640f768
ED		 1865{
1866 int order;
1867
1868 if (pfrag->page) {
1869 if (atomic_read(&pfrag->page->_count) == 1) {
1870 pfrag->offset = 0;
1871 return true;
1872 }
400dfd3a 1873 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1874 return true;
1875 put_page(pfrag->page);
1876 }
1877
097b4f19 1878 order = SKB_FRAG_PAGE_ORDER;
5640f768 1879 do {
400dfd3a 1880 gfp_t gfp = prio;
5640f768
ED		 1881
1882 if (order)
ed98df33 1883 gfp |= __GFP_COMP | __GFP_NOWARN | __GFP_NORETRY;
5640f768
ED		 1884 pfrag->page = alloc_pages(gfp, order);
1885 if (likely(pfrag->page)) {
1886 pfrag->offset = 0;
1887 pfrag->size = PAGE_SIZE << order;
1888 return true;
1889 }
1890 } while (--order >= 0);
1891
400dfd3a
ED		 1892 return false;
1893}
1894EXPORT_SYMBOL(skb_page_frag_refill);
1895
1896bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1897{
1898 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1899 return true;
1900
5640f768
ED		 1901 sk_enter_memory_pressure(sk);
1902 sk_stream_moderate_sndbuf(sk);
1903 return false;
1904}
1905EXPORT_SYMBOL(sk_page_frag_refill);
1906
1da177e4 1907static void __lock_sock(struct sock *sk)
f39234d6
NK		 1908 __releases(&sk->sk_lock.slock)
1909 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1910{
1911 DEFINE_WAIT(wait);
1912
e71a4783 1913 for (;;) {
1da177e4
LT		 1914 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1915 TASK_UNINTERRUPTIBLE);
1916 spin_unlock_bh(&sk->sk_lock.slock);
1917 schedule();
1918 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1919 if (!sock_owned_by_user(sk))
1da177e4
LT		 1920 break;
1921 }
1922 finish_wait(&sk->sk_lock.wq, &wait);
1923}
1924
1925static void __release_sock(struct sock *sk)
f39234d6
NK		 1926 __releases(&sk->sk_lock.slock)
1927 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1928{
1929 struct sk_buff *skb = sk->sk_backlog.head;
1930
1931 do {
1932 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1933 bh_unlock_sock(sk);
1934
1935 do {
1936 struct sk_buff *next = skb->next;
1937
e4cbb02a 1938 prefetch(next);
7fee226a 1939 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1940 skb->next = NULL;
c57943a1 1941 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1942
1943 /*
1944 * We are in process context here with softirqs
1945 * disabled, use cond_resched_softirq() to preempt.
1946 * This is safe to do because we've taken the backlog
1947 * queue private:
1948 */
1949 cond_resched_softirq();
1950
1951 skb = next;
1952 } while (skb != NULL);
1953
1954 bh_lock_sock(sk);
e71a4783 1955 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1956
1957 /*
1958 * Doing the zeroing here guarantee we can not loop forever
1959 * while a wild producer attempts to flood us.
1960 */
1961 sk->sk_backlog.len = 0;
1da177e4
LT		 1962}
1963
1964/**
1965 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1966 * @sk: sock to wait on
1967 * @timeo: for how long
1da177e4
LT		 1968 *
1969 * Now socket state including sk->sk_err is changed only under lock,
1970 * hence we may omit checks after joining wait queue.
1971 * We check receive queue before schedule() only as optimization;
1972 * it is very likely that release_sock() added new data.
1973 */
1974int sk_wait_data(struct sock *sk, long *timeo)
1975{
1976 int rc;
1977 DEFINE_WAIT(wait);
1978
aa395145 1979 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1980 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1981 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1982 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1983 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1984 return rc;
1985}
1da177e4
LT		 1986EXPORT_SYMBOL(sk_wait_data);
1987
3ab224be
HA		 1988/**
1989 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1990 * @sk: socket
1991 * @size: memory size to allocate
1992 * @kind: allocation type
1993 *
1994 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1995 * rmem allocation. This function assumes that protocols which have
1996 * memory_pressure use sk_wmem_queued as write buffer accounting.
1997 */
1998int __sk_mem_schedule(struct sock *sk, int size, int kind)
1999{
2000 struct proto *prot = sk->sk_prot;
2001 int amt = sk_mem_pages(size);
8d987e5c 2002 long allocated;
e1aab161 2003 int parent_status = UNDER_LIMIT;
3ab224be
HA		 2004
2005 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 2006
e1aab161 2007 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 2008
2009 /* Under limit. */
e1aab161
GC		 2010 if (parent_status == UNDER_LIMIT &&
2011 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2012 sk_leave_memory_pressure(sk);
3ab224be
HA		 2013 return 1;
2014 }
2015
e1aab161
GC		 2016 /* Under pressure. (we or our parents) */
2017 if ((parent_status > SOFT_LIMIT) ||
2018 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2019 sk_enter_memory_pressure(sk);
3ab224be 2020
e1aab161
GC		 2021 /* Over hard limit (we or our parents) */
2022 if ((parent_status == OVER_LIMIT) ||
2023 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 2024 goto suppress_allocation;
2025
2026 /* guarantee minimum buffer size under pressure */
2027 if (kind == SK_MEM_RECV) {
2028 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2029 return 1;
180d8cd9 2030
3ab224be
HA		 2031 } else { /* SK_MEM_SEND */
2032 if (sk->sk_type == SOCK_STREAM) {
2033 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2034 return 1;
2035 } else if (atomic_read(&sk->sk_wmem_alloc) <
2036 prot->sysctl_wmem[0])
2037 return 1;
2038 }
2039
180d8cd9 2040 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2041 int alloc;
2042
180d8cd9 2043 if (!sk_under_memory_pressure(sk))
1748376b 2044 return 1;
180d8cd9
GC		 2045 alloc = sk_sockets_allocated_read_positive(sk);
2046 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2047 sk_mem_pages(sk->sk_wmem_queued +
2048 atomic_read(&sk->sk_rmem_alloc) +
2049 sk->sk_forward_alloc))
2050 return 1;
2051 }
2052
2053suppress_allocation:
2054
2055 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2056 sk_stream_moderate_sndbuf(sk);
2057
2058 /* Fail only if socket is _under_ its sndbuf.
2059 * In this case we cannot block, so that we have to fail.
2060 */
2061 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2062 return 1;
2063 }
2064
3847ce32
SM		 2065 trace_sock_exceed_buf_limit(sk, prot, allocated);
2066
3ab224be
HA		 2067 /* Alas. Undo changes. */
2068 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2069
0e90b31f 2070 sk_memory_allocated_sub(sk, amt);
180d8cd9 2071
3ab224be
HA		 2072 return 0;
2073}
3ab224be
HA		 2074EXPORT_SYMBOL(__sk_mem_schedule);
2075
2076/**
2077 * __sk_reclaim - reclaim memory_allocated
2078 * @sk: socket
2079 */
2080void __sk_mem_reclaim(struct sock *sk)
2081{
180d8cd9 2082 sk_memory_allocated_sub(sk,
0e90b31f 2083 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
3ab224be
HA		 2084 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
2085
180d8cd9
GC		 2086 if (sk_under_memory_pressure(sk) &&
2087 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2088 sk_leave_memory_pressure(sk);
3ab224be 2089}
3ab224be
HA		 2090EXPORT_SYMBOL(__sk_mem_reclaim);
2091
2092
1da177e4
LT		 2093/*
2094 * Set of default routines for initialising struct proto_ops when
2095 * the protocol does not support a particular function. In certain
2096 * cases where it makes no sense for a protocol to have a "do nothing"
2097 * function, some default processing is provided.
2098 */
2099
2100int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2101{
2102 return -EOPNOTSUPP;
2103}
2a91525c 2104EXPORT_SYMBOL(sock_no_bind);
1da177e4 2105
4ec93edb 2106int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2107 int len, int flags)
2108{
2109 return -EOPNOTSUPP;
2110}
2a91525c 2111EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2112
2113int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2114{
2115 return -EOPNOTSUPP;
2116}
2a91525c 2117EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2118
2119int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2120{
2121 return -EOPNOTSUPP;
2122}
2a91525c 2123EXPORT_SYMBOL(sock_no_accept);
1da177e4 2124
4ec93edb 2125int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2126 int *len, int peer)
2127{
2128 return -EOPNOTSUPP;
2129}
2a91525c 2130EXPORT_SYMBOL(sock_no_getname);
1da177e4 2131
2a91525c 2132unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2133{
2134 return 0;
2135}
2a91525c 2136EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2137
2138int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2139{
2140 return -EOPNOTSUPP;
2141}
2a91525c 2142EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2143
2144int sock_no_listen(struct socket *sock, int backlog)
2145{
2146 return -EOPNOTSUPP;
2147}
2a91525c 2148EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2149
2150int sock_no_shutdown(struct socket *sock, int how)
2151{
2152 return -EOPNOTSUPP;
2153}
2a91525c 2154EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2155
2156int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2157 char __user *optval, unsigned int optlen)
1da177e4
LT		 2158{
2159 return -EOPNOTSUPP;
2160}
2a91525c 2161EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2162
2163int sock_no_getsockopt(struct socket *sock, int level, int optname,
2164 char __user *optval, int __user *optlen)
2165{
2166 return -EOPNOTSUPP;
2167}
2a91525c 2168EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 2169
2170int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2171 size_t len)
2172{
2173 return -EOPNOTSUPP;
2174}
2a91525c 2175EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 2176
2177int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2178 size_t len, int flags)
2179{
2180 return -EOPNOTSUPP;
2181}
2a91525c 2182EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2183
2184int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2185{
2186 /* Mirror missing mmap method error code */
2187 return -ENODEV;
2188}
2a91525c 2189EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2190
2191ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2192{
2193 ssize_t res;
2194 struct msghdr msg = {.msg_flags = flags};
2195 struct kvec iov;
2196 char *kaddr = kmap(page);
2197 iov.iov_base = kaddr + offset;
2198 iov.iov_len = size;
2199 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2200 kunmap(page);
2201 return res;
2202}
2a91525c 2203EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2204
2205/*
2206 * Default Socket Callbacks
2207 */
2208
2209static void sock_def_wakeup(struct sock *sk)
2210{
43815482
ED		 2211 struct socket_wq *wq;
2212
2213 rcu_read_lock();
2214 wq = rcu_dereference(sk->sk_wq);
2215 if (wq_has_sleeper(wq))
2216 wake_up_interruptible_all(&wq->wait);
2217 rcu_read_unlock();
1da177e4
LT		 2218}
2219
2220static void sock_def_error_report(struct sock *sk)
2221{
43815482
ED		 2222 struct socket_wq *wq;
2223
2224 rcu_read_lock();
2225 wq = rcu_dereference(sk->sk_wq);
2226 if (wq_has_sleeper(wq))
2227 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2228 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2229 rcu_read_unlock();
1da177e4
LT		 2230}
2231
676d2369 2232static void sock_def_readable(struct sock *sk)
1da177e4 2233{
43815482
ED		 2234 struct socket_wq *wq;
2235
2236 rcu_read_lock();
2237 wq = rcu_dereference(sk->sk_wq);
2238 if (wq_has_sleeper(wq))
2c6607c6 2239 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2240 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2241 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2242 rcu_read_unlock();
1da177e4
LT		 2243}
2244
2245static void sock_def_write_space(struct sock *sk)
2246{
43815482
ED		 2247 struct socket_wq *wq;
2248
2249 rcu_read_lock();
1da177e4
LT		 2250
2251 /* Do not wake up a writer until he can make "significant"
2252 * progress. --DaveM
2253 */
e71a4783 2254 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2255 wq = rcu_dereference(sk->sk_wq);
2256 if (wq_has_sleeper(wq))
2257 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2258 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2259
2260 /* Should agree with poll, otherwise some programs break */
2261 if (sock_writeable(sk))
8d8ad9d7 2262 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2263 }
2264
43815482 2265 rcu_read_unlock();
1da177e4
LT		 2266}
2267
2268static void sock_def_destruct(struct sock *sk)
2269{
a51482bd 2270 kfree(sk->sk_protinfo);
1da177e4
LT		 2271}
2272
2273void sk_send_sigurg(struct sock *sk)
2274{
2275 if (sk->sk_socket && sk->sk_socket->file)
2276 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2277 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2278}
2a91525c 2279EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2280
2281void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2282 unsigned long expires)
2283{
2284 if (!mod_timer(timer, expires))
2285 sock_hold(sk);
2286}
1da177e4
LT		 2287EXPORT_SYMBOL(sk_reset_timer);
2288
2289void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2290{
25cc4ae9 2291 if (del_timer(timer))
1da177e4
LT		 2292 __sock_put(sk);
2293}
1da177e4
LT		 2294EXPORT_SYMBOL(sk_stop_timer);
2295
2296void sock_init_data(struct socket *sock, struct sock *sk)
2297{
2298 skb_queue_head_init(&sk->sk_receive_queue);
2299 skb_queue_head_init(&sk->sk_write_queue);
2300 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 2301#ifdef CONFIG_NET_DMA
2302 skb_queue_head_init(&sk->sk_async_wait_queue);
2303#endif
1da177e4
LT		 2304
2305 sk->sk_send_head = NULL;
2306
2307 init_timer(&sk->sk_timer);
4ec93edb 2308
1da177e4
LT		 2309 sk->sk_allocation = GFP_KERNEL;
2310 sk->sk_rcvbuf = sysctl_rmem_default;
2311 sk->sk_sndbuf = sysctl_wmem_default;
2312 sk->sk_state = TCP_CLOSE;
972692e0 2313 sk_set_socket(sk, sock);
1da177e4
LT		 2314
2315 sock_set_flag(sk, SOCK_ZAPPED);
2316
e71a4783 2317 if (sock) {
1da177e4 2318 sk->sk_type = sock->type;
43815482 2319 sk->sk_wq = sock->wq;
1da177e4
LT		 2320 sock->sk = sk;
2321 } else
43815482 2322 sk->sk_wq = NULL;
1da177e4 2323
b6c6712a 2324 spin_lock_init(&sk->sk_dst_lock);
1da177e4 2325 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2326 lockdep_set_class_and_name(&sk->sk_callback_lock,
2327 af_callback_keys + sk->sk_family,
2328 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2329
2330 sk->sk_state_change = sock_def_wakeup;
2331 sk->sk_data_ready = sock_def_readable;
2332 sk->sk_write_space = sock_def_write_space;
2333 sk->sk_error_report = sock_def_error_report;
2334 sk->sk_destruct = sock_def_destruct;
2335
5640f768
ED		 2336 sk->sk_frag.page = NULL;
2337 sk->sk_frag.offset = 0;
ef64a54f 2338 sk->sk_peek_off = -1;
1da177e4 2339
109f6e39
EB		 2340 sk->sk_peer_pid = NULL;
2341 sk->sk_peer_cred = NULL;
1da177e4
LT		 2342 sk->sk_write_pending = 0;
2343 sk->sk_rcvlowat = 1;
2344 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2345 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2346
f37f0afb 2347 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2348
e0d1095a 2349#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2350 sk->sk_napi_id = 0;
64b0dc51 2351 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2352#endif
2353
62748f32 2354 sk->sk_max_pacing_rate = ~0U;
7eec4174 2355 sk->sk_pacing_rate = ~0U;
4dc6dc71
ED		 2356 /*
2357 * Before updating sk_refcnt, we must commit prior changes to memory
2358 * (Documentation/RCU/rculist_nulls.txt for details)
2359 */
2360 smp_wmb();
1da177e4 2361 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2362 atomic_set(&sk->sk_drops, 0);
1da177e4 2363}
2a91525c 2364EXPORT_SYMBOL(sock_init_data);
1da177e4 2365
b5606c2d 2366void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2367{
2368 might_sleep();
a5b5bb9a 2369 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2370 if (sk->sk_lock.owned)
1da177e4 2371 __lock_sock(sk);
d2e9117c 2372 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2373 spin_unlock(&sk->sk_lock.slock);
2374 /*
2375 * The sk_lock has mutex_lock() semantics here:
2376 */
fcc70d5f 2377 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2378 local_bh_enable();
1da177e4 2379}
fcc70d5f 2380EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2381
b5606c2d 2382void release_sock(struct sock *sk)
1da177e4 2383{
a5b5bb9a
IM		 2384 /*
2385 * The sk_lock has mutex_unlock() semantics:
2386 */
2387 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2388
2389 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2390 if (sk->sk_backlog.tail)
2391 __release_sock(sk);
46d3ceab 2392
c3f9b018
ED		 2393 /* Warning : release_cb() might need to release sk ownership,
2394 * ie call sock_release_ownership(sk) before us.
2395 */
46d3ceab
ED		 2396 if (sk->sk_prot->release_cb)
2397 sk->sk_prot->release_cb(sk);
2398
c3f9b018 2399 sock_release_ownership(sk);
a5b5bb9a
IM		 2400 if (waitqueue_active(&sk->sk_lock.wq))
2401 wake_up(&sk->sk_lock.wq);
2402 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2403}
2404EXPORT_SYMBOL(release_sock);
2405
8a74ad60
ED		 2406/**
2407 * lock_sock_fast - fast version of lock_sock
2408 * @sk: socket
2409 *
2410 * This version should be used for very small section, where process wont block
2411 * return false if fast path is taken
2412 * sk_lock.slock locked, owned = 0, BH disabled
2413 * return true if slow path is taken
2414 * sk_lock.slock unlocked, owned = 1, BH enabled
2415 */
2416bool lock_sock_fast(struct sock *sk)
2417{
2418 might_sleep();
2419 spin_lock_bh(&sk->sk_lock.slock);
2420
2421 if (!sk->sk_lock.owned)
2422 /*
2423 * Note : We must disable BH
2424 */
2425 return false;
2426
2427 __lock_sock(sk);
2428 sk->sk_lock.owned = 1;
2429 spin_unlock(&sk->sk_lock.slock);
2430 /*
2431 * The sk_lock has mutex_lock() semantics here:
2432 */
2433 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2434 local_bh_enable();
2435 return true;
2436}
2437EXPORT_SYMBOL(lock_sock_fast);
2438
1da177e4 2439int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2440{
b7aa0bf7 2441 struct timeval tv;
1da177e4 2442 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2443 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2444 tv = ktime_to_timeval(sk->sk_stamp);
2445 if (tv.tv_sec == -1)
1da177e4 2446 return -ENOENT;
b7aa0bf7
ED		 2447 if (tv.tv_sec == 0) {
2448 sk->sk_stamp = ktime_get_real();
2449 tv = ktime_to_timeval(sk->sk_stamp);
2450 }
2451 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2452}
1da177e4
LT		 2453EXPORT_SYMBOL(sock_get_timestamp);
2454
ae40eb1e
ED		 2455int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2456{
2457 struct timespec ts;
2458 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2459 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2460 ts = ktime_to_timespec(sk->sk_stamp);
2461 if (ts.tv_sec == -1)
2462 return -ENOENT;
2463 if (ts.tv_sec == 0) {
2464 sk->sk_stamp = ktime_get_real();
2465 ts = ktime_to_timespec(sk->sk_stamp);
2466 }
2467 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2468}
2469EXPORT_SYMBOL(sock_get_timestampns);
2470
20d49473 2471void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2472{
20d49473 2473 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2474 unsigned long previous_flags = sk->sk_flags;
2475
20d49473
PO		 2476 sock_set_flag(sk, flag);
2477 /*
2478 * we just set one of the two flags which require net
2479 * time stamping, but time stamping might have been on
2480 * already because of the other one
2481 */
08e29af3 2482 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2483 net_enable_timestamp();
1da177e4
LT		 2484 }
2485}
1da177e4 2486
cb820f8e
RC		 2487int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2488 int level, int type)
2489{
2490 struct sock_exterr_skb *serr;
364a9e93 2491 struct sk_buff *skb;
cb820f8e
RC		 2492 int copied, err;
2493
2494 err = -EAGAIN;
364a9e93 2495 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 2496 if (skb == NULL)
2497 goto out;
2498
2499 copied = skb->len;
2500 if (copied > len) {
2501 msg->msg_flags |= MSG_TRUNC;
2502 copied = len;
2503 }
2504 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2505 if (err)
2506 goto out_free_skb;
2507
2508 sock_recv_timestamp(msg, sk, skb);
2509
2510 serr = SKB_EXT_ERR(skb);
2511 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2512
2513 msg->msg_flags |= MSG_ERRQUEUE;
2514 err = copied;
2515
cb820f8e
RC		 2516out_free_skb:
2517 kfree_skb(skb);
2518out:
2519 return err;
2520}
2521EXPORT_SYMBOL(sock_recv_errqueue);
2522
1da177e4
LT		 2523/*
2524 * Get a socket option on an socket.
2525 *
2526 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2527 * asynchronous errors should be reported by getsockopt. We assume
2528 * this means if you specify SO_ERROR (otherwise whats the point of it).
2529 */
2530int sock_common_getsockopt(struct socket *sock, int level, int optname,
2531 char __user *optval, int __user *optlen)
2532{
2533 struct sock *sk = sock->sk;
2534
2535 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2536}
1da177e4
LT		 2537EXPORT_SYMBOL(sock_common_getsockopt);
2538
3fdadf7d 2539#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2540int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2541 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2542{
2543 struct sock *sk = sock->sk;
2544
1e51f951 2545 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2546 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2547 optval, optlen);
3fdadf7d
DM		 2548 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2549}
2550EXPORT_SYMBOL(compat_sock_common_getsockopt);
2551#endif
2552
1da177e4
LT		 2553int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2554 struct msghdr *msg, size_t size, int flags)
2555{
2556 struct sock *sk = sock->sk;
2557 int addr_len = 0;
2558 int err;
2559
2560 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2561 flags & ~MSG_DONTWAIT, &addr_len);
2562 if (err >= 0)
2563 msg->msg_namelen = addr_len;
2564 return err;
2565}
1da177e4
LT		 2566EXPORT_SYMBOL(sock_common_recvmsg);
2567
2568/*
2569 * Set socket options on an inet socket.
2570 */
2571int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2572 char __user *optval, unsigned int optlen)
1da177e4
LT		 2573{
2574 struct sock *sk = sock->sk;
2575
2576 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2577}
1da177e4
LT		 2578EXPORT_SYMBOL(sock_common_setsockopt);
2579
3fdadf7d 2580#ifdef CONFIG_COMPAT
543d9cfe 2581int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2582 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2583{
2584 struct sock *sk = sock->sk;
2585
543d9cfe
ACM		 2586 if (sk->sk_prot->compat_setsockopt != NULL)
2587 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2588 optval, optlen);
3fdadf7d
DM		 2589 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2590}
2591EXPORT_SYMBOL(compat_sock_common_setsockopt);
2592#endif
2593
1da177e4
LT		 2594void sk_common_release(struct sock *sk)
2595{
2596 if (sk->sk_prot->destroy)
2597 sk->sk_prot->destroy(sk);
2598
2599 /*
2600 * Observation: when sock_common_release is called, processes have
2601 * no access to socket. But net still has.
2602 * Step one, detach it from networking:
2603 *
2604 * A. Remove from hash tables.
2605 */
2606
2607 sk->sk_prot->unhash(sk);
2608
2609 /*
2610 * In this point socket cannot receive new packets, but it is possible
2611 * that some packets are in flight because some CPU runs receiver and
2612 * did hash table lookup before we unhashed socket. They will achieve
2613 * receive queue and will be purged by socket destructor.
2614 *
2615 * Also we still have packets pending on receive queue and probably,
2616 * our own packets waiting in device queues. sock_destroy will drain
2617 * receive queue, but transmitted packets will delay socket destruction
2618 * until the last reference will be released.
2619 */
2620
2621 sock_orphan(sk);
2622
2623 xfrm_sk_free_policy(sk);
2624
e6848976 2625 sk_refcnt_debug_release(sk);
5640f768
ED		 2626
2627 if (sk->sk_frag.page) {
2628 put_page(sk->sk_frag.page);
2629 sk->sk_frag.page = NULL;
2630 }
2631
1da177e4
LT		 2632 sock_put(sk);
2633}
1da177e4
LT		 2634EXPORT_SYMBOL(sk_common_release);
2635
13ff3d6f
PE		 2636#ifdef CONFIG_PROC_FS
2637#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2638struct prot_inuse {
2639 int val[PROTO_INUSE_NR];
2640};
13ff3d6f
PE		 2641
2642static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2643
2644#ifdef CONFIG_NET_NS
2645void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2646{
d6d9ca0f 2647 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2648}
2649EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2650
2651int sock_prot_inuse_get(struct net *net, struct proto *prot)
2652{
2653 int cpu, idx = prot->inuse_idx;
2654 int res = 0;
2655
2656 for_each_possible_cpu(cpu)
2657 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2658
2659 return res >= 0 ? res : 0;
2660}
2661EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2662
2c8c1e72 2663static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2664{
2665 net->core.inuse = alloc_percpu(struct prot_inuse);
2666 return net->core.inuse ? 0 : -ENOMEM;
2667}
2668
2c8c1e72 2669static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2670{
2671 free_percpu(net->core.inuse);
2672}
2673
2674static struct pernet_operations net_inuse_ops = {
2675 .init = sock_inuse_init_net,
2676 .exit = sock_inuse_exit_net,
2677};
2678
2679static __init int net_inuse_init(void)
2680{
2681 if (register_pernet_subsys(&net_inuse_ops))
2682 panic("Cannot initialize net inuse counters");
2683
2684 return 0;
2685}
2686
2687core_initcall(net_inuse_init);
2688#else
1338d466
PE		 2689static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2690
c29a0bc4 2691void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2692{
d6d9ca0f 2693 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2694}
2695EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2696
c29a0bc4 2697int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2698{
2699 int cpu, idx = prot->inuse_idx;
2700 int res = 0;
2701
2702 for_each_possible_cpu(cpu)
2703 res += per_cpu(prot_inuse, cpu).val[idx];
2704
2705 return res >= 0 ? res : 0;
2706}
2707EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2708#endif
13ff3d6f
PE		 2709
2710static void assign_proto_idx(struct proto *prot)
2711{
2712 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2713
2714 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2715 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2716 return;
2717 }
2718
2719 set_bit(prot->inuse_idx, proto_inuse_idx);
2720}
2721
2722static void release_proto_idx(struct proto *prot)
2723{
2724 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2725 clear_bit(prot->inuse_idx, proto_inuse_idx);
2726}
2727#else
2728static inline void assign_proto_idx(struct proto *prot)
2729{
2730}
2731
2732static inline void release_proto_idx(struct proto *prot)
2733{
2734}
2735#endif
2736
b733c007
PE		 2737int proto_register(struct proto *prot, int alloc_slab)
2738{
1da177e4
LT		 2739 if (alloc_slab) {
2740 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2741 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2742 NULL);
1da177e4
LT		 2743
2744 if (prot->slab == NULL) {
e005d193
JP		 2745 pr_crit("%s: Can't create sock SLAB cache!\n",
2746 prot->name);
60e7663d 2747 goto out;
1da177e4 2748 }
2e6599cb
ACM		 2749
2750 if (prot->rsk_prot != NULL) {
faf23422 2751 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2752 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2753 goto out_free_sock_slab;
2754
7e56b5d6 2755 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2756 prot->rsk_prot->obj_size, 0,
20c2df83 2757 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2758
2759 if (prot->rsk_prot->slab == NULL) {
e005d193
JP		 2760 pr_crit("%s: Can't create request sock SLAB cache!\n",
2761 prot->name);
2e6599cb
ACM		 2762 goto out_free_request_sock_slab_name;
2763 }
2764 }
8feaf0c0 2765
6d6ee43e 2766 if (prot->twsk_prot != NULL) {
faf23422 2767 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2768
7e56b5d6 2769 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2770 goto out_free_request_sock_slab;
2771
6d6ee43e 2772 prot->twsk_prot->twsk_slab =
7e56b5d6 2773 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2774 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2775 0,
2776 SLAB_HWCACHE_ALIGN |
2777 prot->slab_flags,
20c2df83 2778 NULL);
6d6ee43e 2779 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2780 goto out_free_timewait_sock_slab_name;
2781 }
1da177e4
LT		 2782 }
2783
36b77a52 2784 mutex_lock(&proto_list_mutex);
1da177e4 2785 list_add(&prot->node, &proto_list);
13ff3d6f 2786 assign_proto_idx(prot);
36b77a52 2787 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2788 return 0;
2789
8feaf0c0 2790out_free_timewait_sock_slab_name:
7e56b5d6 2791 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2792out_free_request_sock_slab:
2793 if (prot->rsk_prot && prot->rsk_prot->slab) {
2794 kmem_cache_destroy(prot->rsk_prot->slab);
2795 prot->rsk_prot->slab = NULL;
2796 }
2e6599cb 2797out_free_request_sock_slab_name:
72150e9b
DC		 2798 if (prot->rsk_prot)
2799 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2800out_free_sock_slab:
2801 kmem_cache_destroy(prot->slab);
2802 prot->slab = NULL;
b733c007
PE		 2803out:
2804 return -ENOBUFS;
1da177e4 2805}
1da177e4
LT		 2806EXPORT_SYMBOL(proto_register);
2807
2808void proto_unregister(struct proto *prot)
2809{
36b77a52 2810 mutex_lock(&proto_list_mutex);
13ff3d6f 2811 release_proto_idx(prot);
0a3f4358 2812 list_del(&prot->node);
36b77a52 2813 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2814
2815 if (prot->slab != NULL) {
2816 kmem_cache_destroy(prot->slab);
2817 prot->slab = NULL;
2818 }
2819
2e6599cb 2820 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2821 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2822 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2823 prot->rsk_prot->slab = NULL;
2824 }
2825
6d6ee43e 2826 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2827 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2828 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2829 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2830 }
1da177e4 2831}
1da177e4
LT		 2832EXPORT_SYMBOL(proto_unregister);
2833
2834#ifdef CONFIG_PROC_FS
1da177e4 2835static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2836 __acquires(proto_list_mutex)
1da177e4 2837{
36b77a52 2838 mutex_lock(&proto_list_mutex);
60f0438a 2839 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2840}
2841
2842static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2843{
60f0438a 2844 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2845}
2846
2847static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2848 __releases(proto_list_mutex)
1da177e4 2849{
36b77a52 2850 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2851}
2852
2853static char proto_method_implemented(const void *method)
2854{
2855 return method == NULL ? 'n' : 'y';
2856}
180d8cd9
GC		 2857static long sock_prot_memory_allocated(struct proto *proto)
2858{
cb75a36c 2859 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2860}
2861
2862static char *sock_prot_memory_pressure(struct proto *proto)
2863{
2864 return proto->memory_pressure != NULL ?
2865 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2866}
1da177e4
LT		 2867
2868static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2869{
180d8cd9 2870
8d987e5c 2871 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2872 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2873 proto->name,
2874 proto->obj_size,
14e943db 2875 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2876 sock_prot_memory_allocated(proto),
2877 sock_prot_memory_pressure(proto),
1da177e4
LT		 2878 proto->max_header,
2879 proto->slab == NULL ? "no" : "yes",
2880 module_name(proto->owner),
2881 proto_method_implemented(proto->close),
2882 proto_method_implemented(proto->connect),
2883 proto_method_implemented(proto->disconnect),
2884 proto_method_implemented(proto->accept),
2885 proto_method_implemented(proto->ioctl),
2886 proto_method_implemented(proto->init),
2887 proto_method_implemented(proto->destroy),
2888 proto_method_implemented(proto->shutdown),
2889 proto_method_implemented(proto->setsockopt),
2890 proto_method_implemented(proto->getsockopt),
2891 proto_method_implemented(proto->sendmsg),
2892 proto_method_implemented(proto->recvmsg),
2893 proto_method_implemented(proto->sendpage),
2894 proto_method_implemented(proto->bind),
2895 proto_method_implemented(proto->backlog_rcv),
2896 proto_method_implemented(proto->hash),
2897 proto_method_implemented(proto->unhash),
2898 proto_method_implemented(proto->get_port),
2899 proto_method_implemented(proto->enter_memory_pressure));
2900}
2901
2902static int proto_seq_show(struct seq_file *seq, void *v)
2903{
60f0438a 2904 if (v == &proto_list)
1da177e4
LT		 2905 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2906 "protocol",
2907 "size",
2908 "sockets",
2909 "memory",
2910 "press",
2911 "maxhdr",
2912 "slab",
2913 "module",
2914 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2915 else
60f0438a 2916 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2917 return 0;
2918}
2919
f690808e 2920static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2921 .start = proto_seq_start,
2922 .next = proto_seq_next,
2923 .stop = proto_seq_stop,
2924 .show = proto_seq_show,
2925};
2926
2927static int proto_seq_open(struct inode *inode, struct file *file)
2928{
14e943db
ED		 2929 return seq_open_net(inode, file, &proto_seq_ops,
2930 sizeof(struct seq_net_private));
1da177e4
LT		 2931}
2932
9a32144e 2933static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2934 .owner = THIS_MODULE,
2935 .open = proto_seq_open,
2936 .read = seq_read,
2937 .llseek = seq_lseek,
14e943db
ED		 2938 .release = seq_release_net,
2939};
2940
2941static __net_init int proto_init_net(struct net *net)
2942{
d4beaa66 2943 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 2944 return -ENOMEM;
2945
2946 return 0;
2947}
2948
2949static __net_exit void proto_exit_net(struct net *net)
2950{
ece31ffd 2951 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 2952}
2953
2954
2955static __net_initdata struct pernet_operations proto_net_ops = {
2956 .init = proto_init_net,
2957 .exit = proto_exit_net,
1da177e4
LT		 2958};
2959
2960static int __init proto_init(void)
2961{
14e943db 2962 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2963}
2964
2965subsys_initcall(proto_init);
2966
2967#endif /* PROC_FS */
Linux kernel - Deliverables
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