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net-timestamp: move timestamp flags out of sk_flags
[deliverable/linux.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
4ec93edb 35 * code. The ACK stuff can wait and needs major
1da177e4
LT		 36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 *
85 *
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
90 */
91
e005d193
JP		 92#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
93
4fc268d2 94#include <linux/capability.h>
1da177e4 95#include <linux/errno.h>
cb820f8e 96#include <linux/errqueue.h>
1da177e4
LT		 97#include <linux/types.h>
98#include <linux/socket.h>
99#include <linux/in.h>
100#include <linux/kernel.h>
1da177e4
LT		 101#include <linux/module.h>
102#include <linux/proc_fs.h>
103#include <linux/seq_file.h>
104#include <linux/sched.h>
105#include <linux/timer.h>
106#include <linux/string.h>
107#include <linux/sockios.h>
108#include <linux/net.h>
109#include <linux/mm.h>
110#include <linux/slab.h>
111#include <linux/interrupt.h>
112#include <linux/poll.h>
113#include <linux/tcp.h>
114#include <linux/init.h>
a1f8e7f7 115#include <linux/highmem.h>
3f551f94 116#include <linux/user_namespace.h>
c5905afb 117#include <linux/static_key.h>
3969eb38 118#include <linux/memcontrol.h>
8c1ae10d 119#include <linux/prefetch.h>
1da177e4
LT		 120
121#include <asm/uaccess.h>
1da177e4
LT		 122
123#include <linux/netdevice.h>
124#include <net/protocol.h>
125#include <linux/skbuff.h>
457c4cbc 126#include <net/net_namespace.h>
2e6599cb 127#include <net/request_sock.h>
1da177e4 128#include <net/sock.h>
20d49473 129#include <linux/net_tstamp.h>
1da177e4
LT		 130#include <net/xfrm.h>
131#include <linux/ipsec.h>
f8451725 132#include <net/cls_cgroup.h>
5bc1421e 133#include <net/netprio_cgroup.h>
1da177e4
LT		 134
135#include <linux/filter.h>
136
3847ce32
SM		 137#include <trace/events/sock.h>
138
1da177e4
LT		 139#ifdef CONFIG_INET
140#include <net/tcp.h>
141#endif
142
076bb0c8 143#include <net/busy_poll.h>
06021292 144
36b77a52 145static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 146static LIST_HEAD(proto_list);
147
a3b299da
EB		 148/**
149 * sk_ns_capable - General socket capability test
150 * @sk: Socket to use a capability on or through
151 * @user_ns: The user namespace of the capability to use
152 * @cap: The capability to use
153 *
154 * Test to see if the opener of the socket had when the socket was
155 * created and the current process has the capability @cap in the user
156 * namespace @user_ns.
157 */
158bool sk_ns_capable(const struct sock *sk,
159 struct user_namespace *user_ns, int cap)
160{
161 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
162 ns_capable(user_ns, cap);
163}
164EXPORT_SYMBOL(sk_ns_capable);
165
166/**
167 * sk_capable - Socket global capability test
168 * @sk: Socket to use a capability on or through
169 * @cap: The global capbility to use
170 *
171 * Test to see if the opener of the socket had when the socket was
172 * created and the current process has the capability @cap in all user
173 * namespaces.
174 */
175bool sk_capable(const struct sock *sk, int cap)
176{
177 return sk_ns_capable(sk, &init_user_ns, cap);
178}
179EXPORT_SYMBOL(sk_capable);
180
181/**
182 * sk_net_capable - Network namespace socket capability test
183 * @sk: Socket to use a capability on or through
184 * @cap: The capability to use
185 *
186 * Test to see if the opener of the socket had when the socke was created
187 * and the current process has the capability @cap over the network namespace
188 * the socket is a member of.
189 */
190bool sk_net_capable(const struct sock *sk, int cap)
191{
192 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
193}
194EXPORT_SYMBOL(sk_net_capable);
195
196
c255a458 197#ifdef CONFIG_MEMCG_KMEM
1d62e436 198int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
d1a4c0b3
GC		 199{
200 struct proto *proto;
201 int ret = 0;
202
36b77a52 203 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 204 list_for_each_entry(proto, &proto_list, node) {
205 if (proto->init_cgroup) {
1d62e436 206 ret = proto->init_cgroup(memcg, ss);
d1a4c0b3
GC		 207 if (ret)
208 goto out;
209 }
210 }
211
36b77a52 212 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 213 return ret;
214out:
215 list_for_each_entry_continue_reverse(proto, &proto_list, node)
216 if (proto->destroy_cgroup)
1d62e436 217 proto->destroy_cgroup(memcg);
36b77a52 218 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 219 return ret;
220}
221
1d62e436 222void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
d1a4c0b3
GC		 223{
224 struct proto *proto;
225
36b77a52 226 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 227 list_for_each_entry_reverse(proto, &proto_list, node)
228 if (proto->destroy_cgroup)
1d62e436 229 proto->destroy_cgroup(memcg);
36b77a52 230 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 231}
232#endif
233
da21f24d
IM		 234/*
235 * Each address family might have different locking rules, so we have
236 * one slock key per address family:
237 */
a5b5bb9a
IM		 238static struct lock_class_key af_family_keys[AF_MAX];
239static struct lock_class_key af_family_slock_keys[AF_MAX];
240
cbda4eaf 241#if defined(CONFIG_MEMCG_KMEM)
c5905afb 242struct static_key memcg_socket_limit_enabled;
e1aab161 243EXPORT_SYMBOL(memcg_socket_limit_enabled);
cbda4eaf 244#endif
e1aab161 245
a5b5bb9a
IM		 246/*
247 * Make lock validator output more readable. (we pre-construct these
248 * strings build-time, so that runtime initialization of socket
249 * locks is fast):
250 */
36cbd3dc 251static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 252 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
253 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
254 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
255 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
256 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
257 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
258 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 259 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 260 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 261 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 262 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 263 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 264 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
456db6a4 265 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX"
a5b5bb9a 266};
36cbd3dc 267static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 268 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
269 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
270 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
271 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
272 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
273 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
274 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 275 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 276 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 277 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 278 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 279 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 280 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
456db6a4 281 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX"
a5b5bb9a 282};
36cbd3dc 283static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 284 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
285 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
286 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
287 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
288 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
289 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
290 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 291 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 292 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 293 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 294 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 295 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 296 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
456db6a4 297 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX"
443aef0e 298};
da21f24d
IM		 299
300/*
301 * sk_callback_lock locking rules are per-address-family,
302 * so split the lock classes by using a per-AF key:
303 */
304static struct lock_class_key af_callback_keys[AF_MAX];
305
1da177e4
LT		 306/* Take into consideration the size of the struct sk_buff overhead in the
307 * determination of these values, since that is non-constant across
308 * platforms. This makes socket queueing behavior and performance
309 * not depend upon such differences.
310 */
311#define _SK_MEM_PACKETS 256
87fb4b7b 312#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 313#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
314#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
315
316/* Run time adjustable parameters. */
ab32ea5d 317__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 318EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 319__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 320EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 321__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
322__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 323
25985edc 324/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 325int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 326EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 327
c93bdd0e
MG		 328struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
329EXPORT_SYMBOL_GPL(memalloc_socks);
330
7cb02404
MG		 331/**
332 * sk_set_memalloc - sets %SOCK_MEMALLOC
333 * @sk: socket to set it on
334 *
335 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
336 * It's the responsibility of the admin to adjust min_free_kbytes
337 * to meet the requirements
338 */
339void sk_set_memalloc(struct sock *sk)
340{
341 sock_set_flag(sk, SOCK_MEMALLOC);
342 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 343 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 344}
345EXPORT_SYMBOL_GPL(sk_set_memalloc);
346
347void sk_clear_memalloc(struct sock *sk)
348{
349 sock_reset_flag(sk, SOCK_MEMALLOC);
350 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 351 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 352
353 /*
354 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
355 * progress of swapping. However, if SOCK_MEMALLOC is cleared while
356 * it has rmem allocations there is a risk that the user of the
357 * socket cannot make forward progress due to exceeding the rmem
358 * limits. By rights, sk_clear_memalloc() should only be called
359 * on sockets being torn down but warn and reset the accounting if
360 * that assumption breaks.
361 */
362 if (WARN_ON(sk->sk_forward_alloc))
363 sk_mem_reclaim(sk);
7cb02404
MG		 364}
365EXPORT_SYMBOL_GPL(sk_clear_memalloc);
366
b4b9e355
MG		 367int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
368{
369 int ret;
370 unsigned long pflags = current->flags;
371
372 /* these should have been dropped before queueing */
373 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
374
375 current->flags |= PF_MEMALLOC;
376 ret = sk->sk_backlog_rcv(sk, skb);
377 tsk_restore_flags(current, pflags, PF_MEMALLOC);
378
379 return ret;
380}
381EXPORT_SYMBOL(__sk_backlog_rcv);
382
1da177e4
LT		 383static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
384{
385 struct timeval tv;
386
387 if (optlen < sizeof(tv))
388 return -EINVAL;
389 if (copy_from_user(&tv, optval, sizeof(tv)))
390 return -EFAULT;
ba78073e
VA		 391 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
392 return -EDOM;
1da177e4 393
ba78073e 394 if (tv.tv_sec < 0) {
6f11df83
AM		 395 static int warned __read_mostly;
396
ba78073e 397 *timeo_p = 0;
50aab54f 398 if (warned < 10 && net_ratelimit()) {
ba78073e 399 warned++;
e005d193
JP		 400 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
401 __func__, current->comm, task_pid_nr(current));
50aab54f 402 }
ba78073e
VA		 403 return 0;
404 }
1da177e4
LT		 405 *timeo_p = MAX_SCHEDULE_TIMEOUT;
406 if (tv.tv_sec == 0 && tv.tv_usec == 0)
407 return 0;
408 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
409 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
410 return 0;
411}
412
413static void sock_warn_obsolete_bsdism(const char *name)
414{
415 static int warned;
416 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 417 if (strcmp(warncomm, current->comm) && warned < 5) {
418 strcpy(warncomm, current->comm);
e005d193
JP		 419 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
420 warncomm, name);
1da177e4
LT		 421 warned++;
422 }
423}
424
08e29af3
ED		 425#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
426
427static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 428{
08e29af3
ED		 429 if (sk->sk_flags & flags) {
430 sk->sk_flags &= ~flags;
431 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 432 net_disable_timestamp();
1da177e4
LT		 433 }
434}
435
436
f0088a50
DV		 437int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
438{
766e9037 439 int err;
f0088a50 440 int skb_len;
3b885787
NH		 441 unsigned long flags;
442 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 443
0fd7bac6 444 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 445 atomic_inc(&sk->sk_drops);
3847ce32 446 trace_sock_rcvqueue_full(sk, skb);
766e9037 447 return -ENOMEM;
f0088a50
DV		 448 }
449
fda9ef5d 450 err = sk_filter(sk, skb);
f0088a50 451 if (err)
766e9037 452 return err;
f0088a50 453
c76562b6 454 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 455 atomic_inc(&sk->sk_drops);
456 return -ENOBUFS;
3ab224be
HA		 457 }
458
f0088a50
DV		 459 skb->dev = NULL;
460 skb_set_owner_r(skb, sk);
49ad9599 461
f0088a50
DV		 462 /* Cache the SKB length before we tack it onto the receive
463 * queue. Once it is added it no longer belongs to us and
464 * may be freed by other threads of control pulling packets
465 * from the queue.
466 */
467 skb_len = skb->len;
468
7fee226a
ED		 469 /* we escape from rcu protected region, make sure we dont leak
470 * a norefcounted dst
471 */
472 skb_dst_force(skb);
473
3b885787
NH		 474 spin_lock_irqsave(&list->lock, flags);
475 skb->dropcount = atomic_read(&sk->sk_drops);
476 __skb_queue_tail(list, skb);
477 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 478
479 if (!sock_flag(sk, SOCK_DEAD))
676d2369 480 sk->sk_data_ready(sk);
766e9037 481 return 0;
f0088a50
DV		 482}
483EXPORT_SYMBOL(sock_queue_rcv_skb);
484
58a5a7b9 485int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 486{
487 int rc = NET_RX_SUCCESS;
488
fda9ef5d 489 if (sk_filter(sk, skb))
f0088a50
DV		 490 goto discard_and_relse;
491
492 skb->dev = NULL;
493
274f482d 494 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 495 atomic_inc(&sk->sk_drops);
496 goto discard_and_relse;
497 }
58a5a7b9
ACM		 498 if (nested)
499 bh_lock_sock_nested(sk);
500 else
501 bh_lock_sock(sk);
a5b5bb9a
IM		 502 if (!sock_owned_by_user(sk)) {
503 /*
504 * trylock + unlock semantics:
505 */
506 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
507
c57943a1 508 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 509
510 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 511 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 512 bh_unlock_sock(sk);
513 atomic_inc(&sk->sk_drops);
514 goto discard_and_relse;
515 }
516
f0088a50
DV		 517 bh_unlock_sock(sk);
518out:
519 sock_put(sk);
520 return rc;
521discard_and_relse:
522 kfree_skb(skb);
523 goto out;
524}
525EXPORT_SYMBOL(sk_receive_skb);
526
527struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
528{
b6c6712a 529 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 530
531 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 532 sk_tx_queue_clear(sk);
a9b3cd7f 533 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 534 dst_release(dst);
535 return NULL;
536 }
537
538 return dst;
539}
540EXPORT_SYMBOL(__sk_dst_check);
541
542struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
543{
544 struct dst_entry *dst = sk_dst_get(sk);
545
546 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
547 sk_dst_reset(sk);
548 dst_release(dst);
549 return NULL;
550 }
551
552 return dst;
553}
554EXPORT_SYMBOL(sk_dst_check);
555
c91f6df2
BH		 556static int sock_setbindtodevice(struct sock *sk, char __user *optval,
557 int optlen)
4878809f
DM		 558{
559 int ret = -ENOPROTOOPT;
560#ifdef CONFIG_NETDEVICES
3b1e0a65 561 struct net *net = sock_net(sk);
4878809f
DM		 562 char devname[IFNAMSIZ];
563 int index;
564
565 /* Sorry... */
566 ret = -EPERM;
5e1fccc0 567 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 568 goto out;
569
570 ret = -EINVAL;
571 if (optlen < 0)
572 goto out;
573
574 /* Bind this socket to a particular device like "eth0",
575 * as specified in the passed interface name. If the
576 * name is "" or the option length is zero the socket
577 * is not bound.
578 */
579 if (optlen > IFNAMSIZ - 1)
580 optlen = IFNAMSIZ - 1;
581 memset(devname, 0, sizeof(devname));
582
583 ret = -EFAULT;
584 if (copy_from_user(devname, optval, optlen))
585 goto out;
586
000ba2e4
DM		 587 index = 0;
588 if (devname[0] != '\0') {
bf8e56bf 589 struct net_device *dev;
4878809f 590
bf8e56bf
ED		 591 rcu_read_lock();
592 dev = dev_get_by_name_rcu(net, devname);
593 if (dev)
594 index = dev->ifindex;
595 rcu_read_unlock();
4878809f
DM		 596 ret = -ENODEV;
597 if (!dev)
598 goto out;
4878809f
DM		 599 }
600
601 lock_sock(sk);
602 sk->sk_bound_dev_if = index;
603 sk_dst_reset(sk);
604 release_sock(sk);
605
606 ret = 0;
607
608out:
609#endif
610
611 return ret;
612}
613
c91f6df2
BH		 614static int sock_getbindtodevice(struct sock *sk, char __user *optval,
615 int __user *optlen, int len)
616{
617 int ret = -ENOPROTOOPT;
618#ifdef CONFIG_NETDEVICES
619 struct net *net = sock_net(sk);
c91f6df2 620 char devname[IFNAMSIZ];
c91f6df2
BH		 621
622 if (sk->sk_bound_dev_if == 0) {
623 len = 0;
624 goto zero;
625 }
626
627 ret = -EINVAL;
628 if (len < IFNAMSIZ)
629 goto out;
630
5dbe7c17
NS		 631 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
632 if (ret)
c91f6df2 633 goto out;
c91f6df2
BH		 634
635 len = strlen(devname) + 1;
636
637 ret = -EFAULT;
638 if (copy_to_user(optval, devname, len))
639 goto out;
640
641zero:
642 ret = -EFAULT;
643 if (put_user(len, optlen))
644 goto out;
645
646 ret = 0;
647
648out:
649#endif
650
651 return ret;
652}
653
c0ef877b
PE		 654static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
655{
656 if (valbool)
657 sock_set_flag(sk, bit);
658 else
659 sock_reset_flag(sk, bit);
660}
661
1da177e4
LT		 662/*
663 * This is meant for all protocols to use and covers goings on
664 * at the socket level. Everything here is generic.
665 */
666
667int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 668 char __user *optval, unsigned int optlen)
1da177e4 669{
2a91525c 670 struct sock *sk = sock->sk;
1da177e4
LT		 671 int val;
672 int valbool;
673 struct linger ling;
674 int ret = 0;
4ec93edb 675
1da177e4
LT		 676 /*
677 * Options without arguments
678 */
679
4878809f 680 if (optname == SO_BINDTODEVICE)
c91f6df2 681 return sock_setbindtodevice(sk, optval, optlen);
4878809f 682
e71a4783
SH		 683 if (optlen < sizeof(int))
684 return -EINVAL;
4ec93edb 685
1da177e4
LT		 686 if (get_user(val, (int __user *)optval))
687 return -EFAULT;
4ec93edb 688
2a91525c 689 valbool = val ? 1 : 0;
1da177e4
LT		 690
691 lock_sock(sk);
692
2a91525c 693 switch (optname) {
e71a4783 694 case SO_DEBUG:
2a91525c 695 if (val && !capable(CAP_NET_ADMIN))
e71a4783 696 ret = -EACCES;
2a91525c 697 else
c0ef877b 698 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 699 break;
700 case SO_REUSEADDR:
4a17fd52 701 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 702 break;
055dc21a
TH		 703 case SO_REUSEPORT:
704 sk->sk_reuseport = valbool;
705 break;
e71a4783 706 case SO_TYPE:
49c794e9 707 case SO_PROTOCOL:
0d6038ee 708 case SO_DOMAIN:
e71a4783
SH		 709 case SO_ERROR:
710 ret = -ENOPROTOOPT;
711 break;
712 case SO_DONTROUTE:
c0ef877b 713 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 714 break;
715 case SO_BROADCAST:
716 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
717 break;
718 case SO_SNDBUF:
719 /* Don't error on this BSD doesn't and if you think
82981930
ED		 720 * about it this is right. Otherwise apps have to
721 * play 'guess the biggest size' games. RCVBUF/SNDBUF
722 * are treated in BSD as hints
723 */
724 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 725set_sndbuf:
e71a4783 726 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 727 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
728 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 729 sk->sk_write_space(sk);
730 break;
1da177e4 731
e71a4783
SH		 732 case SO_SNDBUFFORCE:
733 if (!capable(CAP_NET_ADMIN)) {
734 ret = -EPERM;
735 break;
736 }
737 goto set_sndbuf;
b0573dea 738
e71a4783
SH		 739 case SO_RCVBUF:
740 /* Don't error on this BSD doesn't and if you think
82981930
ED		 741 * about it this is right. Otherwise apps have to
742 * play 'guess the biggest size' games. RCVBUF/SNDBUF
743 * are treated in BSD as hints
744 */
745 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 746set_rcvbuf:
e71a4783
SH		 747 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
748 /*
749 * We double it on the way in to account for
750 * "struct sk_buff" etc. overhead. Applications
751 * assume that the SO_RCVBUF setting they make will
752 * allow that much actual data to be received on that
753 * socket.
754 *
755 * Applications are unaware that "struct sk_buff" and
756 * other overheads allocate from the receive buffer
757 * during socket buffer allocation.
758 *
759 * And after considering the possible alternatives,
760 * returning the value we actually used in getsockopt
761 * is the most desirable behavior.
762 */
82981930 763 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 764 break;
765
766 case SO_RCVBUFFORCE:
767 if (!capable(CAP_NET_ADMIN)) {
768 ret = -EPERM;
1da177e4 769 break;
e71a4783
SH		 770 }
771 goto set_rcvbuf;
1da177e4 772
e71a4783 773 case SO_KEEPALIVE:
1da177e4 774#ifdef CONFIG_INET
3e10986d
ED		 775 if (sk->sk_protocol == IPPROTO_TCP &&
776 sk->sk_type == SOCK_STREAM)
e71a4783 777 tcp_set_keepalive(sk, valbool);
1da177e4 778#endif
e71a4783
SH		 779 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
780 break;
781
782 case SO_OOBINLINE:
783 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
784 break;
785
786 case SO_NO_CHECK:
28448b80 787 sk->sk_no_check_tx = valbool;
e71a4783
SH		 788 break;
789
790 case SO_PRIORITY:
5e1fccc0
EB		 791 if ((val >= 0 && val <= 6) ||
792 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 793 sk->sk_priority = val;
794 else
795 ret = -EPERM;
796 break;
797
798 case SO_LINGER:
799 if (optlen < sizeof(ling)) {
800 ret = -EINVAL; /* 1003.1g */
1da177e4 801 break;
e71a4783 802 }
2a91525c 803 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 804 ret = -EFAULT;
1da177e4 805 break;
e71a4783
SH		 806 }
807 if (!ling.l_onoff)
808 sock_reset_flag(sk, SOCK_LINGER);
809 else {
1da177e4 810#if (BITS_PER_LONG == 32)
e71a4783
SH		 811 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
812 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 813 else
e71a4783
SH		 814#endif
815 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
816 sock_set_flag(sk, SOCK_LINGER);
817 }
818 break;
819
820 case SO_BSDCOMPAT:
821 sock_warn_obsolete_bsdism("setsockopt");
822 break;
823
824 case SO_PASSCRED:
825 if (valbool)
826 set_bit(SOCK_PASSCRED, &sock->flags);
827 else
828 clear_bit(SOCK_PASSCRED, &sock->flags);
829 break;
830
831 case SO_TIMESTAMP:
92f37fd2 832 case SO_TIMESTAMPNS:
e71a4783 833 if (valbool) {
92f37fd2
ED		 834 if (optname == SO_TIMESTAMP)
835 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
836 else
837 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 838 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 839 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 840 } else {
e71a4783 841 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 842 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
843 }
e71a4783
SH		 844 break;
845
20d49473
PO		 846 case SO_TIMESTAMPING:
847 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 848 ret = -EINVAL;
20d49473
PO		 849 break;
850 }
b9f40e21 851 sk->sk_tsflags = val;
20d49473
PO		 852 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
853 sock_enable_timestamp(sk,
854 SOCK_TIMESTAMPING_RX_SOFTWARE);
855 else
856 sock_disable_timestamp(sk,
08e29af3 857 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 858 break;
859
e71a4783
SH		 860 case SO_RCVLOWAT:
861 if (val < 0)
862 val = INT_MAX;
863 sk->sk_rcvlowat = val ? : 1;
864 break;
865
866 case SO_RCVTIMEO:
867 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
868 break;
869
870 case SO_SNDTIMEO:
871 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
872 break;
1da177e4 873
e71a4783
SH		 874 case SO_ATTACH_FILTER:
875 ret = -EINVAL;
876 if (optlen == sizeof(struct sock_fprog)) {
877 struct sock_fprog fprog;
1da177e4 878
e71a4783
SH		 879 ret = -EFAULT;
880 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 881 break;
e71a4783
SH		 882
883 ret = sk_attach_filter(&fprog, sk);
884 }
885 break;
886
887 case SO_DETACH_FILTER:
55b33325 888 ret = sk_detach_filter(sk);
e71a4783 889 break;
1da177e4 890
d59577b6
VB		 891 case SO_LOCK_FILTER:
892 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
893 ret = -EPERM;
894 else
895 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
896 break;
897
e71a4783
SH		 898 case SO_PASSSEC:
899 if (valbool)
900 set_bit(SOCK_PASSSEC, &sock->flags);
901 else
902 clear_bit(SOCK_PASSSEC, &sock->flags);
903 break;
4a19ec58 904 case SO_MARK:
5e1fccc0 905 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 906 ret = -EPERM;
2a91525c 907 else
4a19ec58 908 sk->sk_mark = val;
4a19ec58 909 break;
877ce7c1 910
1da177e4
LT		 911 /* We implement the SO_SNDLOWAT etc to
912 not be settable (1003.1g 5.3) */
3b885787 913 case SO_RXQ_OVFL:
8083f0fc 914 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 915 break;
6e3e939f
JB		 916
917 case SO_WIFI_STATUS:
918 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
919 break;
920
ef64a54f
PE		 921 case SO_PEEK_OFF:
922 if (sock->ops->set_peek_off)
12663bfc 923 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 924 else
925 ret = -EOPNOTSUPP;
926 break;
3bdc0eba
BG		 927
928 case SO_NOFCS:
929 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
930 break;
931
7d4c04fc
KJ		 932 case SO_SELECT_ERR_QUEUE:
933 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
934 break;
935
e0d1095a 936#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 937 case SO_BUSY_POLL:
dafcc438
ET		 938 /* allow unprivileged users to decrease the value */
939 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
940 ret = -EPERM;
941 else {
942 if (val < 0)
943 ret = -EINVAL;
944 else
945 sk->sk_ll_usec = val;
946 }
947 break;
948#endif
62748f32
ED		 949
950 case SO_MAX_PACING_RATE:
951 sk->sk_max_pacing_rate = val;
952 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
953 sk->sk_max_pacing_rate);
954 break;
955
e71a4783
SH		 956 default:
957 ret = -ENOPROTOOPT;
958 break;
4ec93edb 959 }
1da177e4
LT		 960 release_sock(sk);
961 return ret;
962}
2a91525c 963EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 964
965
8f09898b 966static void cred_to_ucred(struct pid *pid, const struct cred *cred,
967 struct ucred *ucred)
3f551f94
EB		 968{
969 ucred->pid = pid_vnr(pid);
970 ucred->uid = ucred->gid = -1;
971 if (cred) {
972 struct user_namespace *current_ns = current_user_ns();
973
b2e4f544
EB		 974 ucred->uid = from_kuid_munged(current_ns, cred->euid);
975 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 976 }
977}
978
1da177e4
LT		 979int sock_getsockopt(struct socket *sock, int level, int optname,
980 char __user *optval, int __user *optlen)
981{
982 struct sock *sk = sock->sk;
4ec93edb 983
e71a4783 984 union {
4ec93edb
YH		 985 int val;
986 struct linger ling;
1da177e4
LT		 987 struct timeval tm;
988 } v;
4ec93edb 989
4d0392be 990 int lv = sizeof(int);
1da177e4 991 int len;
4ec93edb 992
e71a4783 993 if (get_user(len, optlen))
4ec93edb 994 return -EFAULT;
e71a4783 995 if (len < 0)
1da177e4 996 return -EINVAL;
4ec93edb 997
50fee1de 998 memset(&v, 0, sizeof(v));
df0bca04 999
2a91525c 1000 switch (optname) {
e71a4783
SH		 1001 case SO_DEBUG:
1002 v.val = sock_flag(sk, SOCK_DBG);
1003 break;
1004
1005 case SO_DONTROUTE:
1006 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1007 break;
1008
1009 case SO_BROADCAST:
1b23a5df 1010 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1011 break;
1012
1013 case SO_SNDBUF:
1014 v.val = sk->sk_sndbuf;
1015 break;
1016
1017 case SO_RCVBUF:
1018 v.val = sk->sk_rcvbuf;
1019 break;
1020
1021 case SO_REUSEADDR:
1022 v.val = sk->sk_reuse;
1023 break;
1024
055dc21a
TH		 1025 case SO_REUSEPORT:
1026 v.val = sk->sk_reuseport;
1027 break;
1028
e71a4783 1029 case SO_KEEPALIVE:
1b23a5df 1030 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1031 break;
1032
1033 case SO_TYPE:
1034 v.val = sk->sk_type;
1035 break;
1036
49c794e9
JE		 1037 case SO_PROTOCOL:
1038 v.val = sk->sk_protocol;
1039 break;
1040
0d6038ee
JE		 1041 case SO_DOMAIN:
1042 v.val = sk->sk_family;
1043 break;
1044
e71a4783
SH		 1045 case SO_ERROR:
1046 v.val = -sock_error(sk);
2a91525c 1047 if (v.val == 0)
e71a4783
SH		 1048 v.val = xchg(&sk->sk_err_soft, 0);
1049 break;
1050
1051 case SO_OOBINLINE:
1b23a5df 1052 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1053 break;
1054
1055 case SO_NO_CHECK:
28448b80 1056 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1057 break;
1058
1059 case SO_PRIORITY:
1060 v.val = sk->sk_priority;
1061 break;
1062
1063 case SO_LINGER:
1064 lv = sizeof(v.ling);
1b23a5df 1065 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1066 v.ling.l_linger = sk->sk_lingertime / HZ;
1067 break;
1068
1069 case SO_BSDCOMPAT:
1070 sock_warn_obsolete_bsdism("getsockopt");
1071 break;
1072
1073 case SO_TIMESTAMP:
92f37fd2
ED		 1074 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1075 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1076 break;
1077
1078 case SO_TIMESTAMPNS:
1079 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1080 break;
1081
20d49473 1082 case SO_TIMESTAMPING:
b9f40e21 1083 v.val = sk->sk_tsflags;
20d49473
PO		 1084 break;
1085
e71a4783 1086 case SO_RCVTIMEO:
2a91525c 1087 lv = sizeof(struct timeval);
e71a4783
SH		 1088 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1089 v.tm.tv_sec = 0;
1090 v.tm.tv_usec = 0;
1091 } else {
1092 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1093 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1094 }
1095 break;
1096
1097 case SO_SNDTIMEO:
2a91525c 1098 lv = sizeof(struct timeval);
e71a4783
SH		 1099 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1100 v.tm.tv_sec = 0;
1101 v.tm.tv_usec = 0;
1102 } else {
1103 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1104 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1105 }
1106 break;
1da177e4 1107
e71a4783
SH		 1108 case SO_RCVLOWAT:
1109 v.val = sk->sk_rcvlowat;
1110 break;
1da177e4 1111
e71a4783 1112 case SO_SNDLOWAT:
2a91525c 1113 v.val = 1;
e71a4783 1114 break;
1da177e4 1115
e71a4783 1116 case SO_PASSCRED:
82981930 1117 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1118 break;
1da177e4 1119
e71a4783 1120 case SO_PEERCRED:
109f6e39
EB		 1121 {
1122 struct ucred peercred;
1123 if (len > sizeof(peercred))
1124 len = sizeof(peercred);
1125 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1126 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1127 return -EFAULT;
1128 goto lenout;
109f6e39 1129 }
1da177e4 1130
e71a4783
SH		 1131 case SO_PEERNAME:
1132 {
1133 char address[128];
1134
1135 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1136 return -ENOTCONN;
1137 if (lv < len)
1138 return -EINVAL;
1139 if (copy_to_user(optval, address, len))
1140 return -EFAULT;
1141 goto lenout;
1142 }
1da177e4 1143
e71a4783
SH		 1144 /* Dubious BSD thing... Probably nobody even uses it, but
1145 * the UNIX standard wants it for whatever reason... -DaveM
1146 */
1147 case SO_ACCEPTCONN:
1148 v.val = sk->sk_state == TCP_LISTEN;
1149 break;
1da177e4 1150
e71a4783 1151 case SO_PASSSEC:
82981930 1152 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1153 break;
877ce7c1 1154
e71a4783
SH		 1155 case SO_PEERSEC:
1156 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1157
4a19ec58
LAT		 1158 case SO_MARK:
1159 v.val = sk->sk_mark;
1160 break;
1161
3b885787 1162 case SO_RXQ_OVFL:
1b23a5df 1163 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1164 break;
1165
6e3e939f 1166 case SO_WIFI_STATUS:
1b23a5df 1167 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1168 break;
1169
ef64a54f
PE		 1170 case SO_PEEK_OFF:
1171 if (!sock->ops->set_peek_off)
1172 return -EOPNOTSUPP;
1173
1174 v.val = sk->sk_peek_off;
1175 break;
bc2f7996 1176 case SO_NOFCS:
1b23a5df 1177 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1178 break;
c91f6df2 1179
f7b86bfe 1180 case SO_BINDTODEVICE:
c91f6df2
BH		 1181 return sock_getbindtodevice(sk, optval, optlen, len);
1182
a8fc9277
PE		 1183 case SO_GET_FILTER:
1184 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1185 if (len < 0)
1186 return len;
1187
1188 goto lenout;
c91f6df2 1189
d59577b6
VB		 1190 case SO_LOCK_FILTER:
1191 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1192 break;
1193
ea02f941
MS		 1194 case SO_BPF_EXTENSIONS:
1195 v.val = bpf_tell_extensions();
1196 break;
1197
7d4c04fc
KJ		 1198 case SO_SELECT_ERR_QUEUE:
1199 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1200 break;
1201
e0d1095a 1202#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1203 case SO_BUSY_POLL:
dafcc438
ET		 1204 v.val = sk->sk_ll_usec;
1205 break;
1206#endif
1207
62748f32
ED		 1208 case SO_MAX_PACING_RATE:
1209 v.val = sk->sk_max_pacing_rate;
1210 break;
1211
e71a4783
SH		 1212 default:
1213 return -ENOPROTOOPT;
1da177e4 1214 }
e71a4783 1215
1da177e4
LT		 1216 if (len > lv)
1217 len = lv;
1218 if (copy_to_user(optval, &v, len))
1219 return -EFAULT;
1220lenout:
4ec93edb
YH		 1221 if (put_user(len, optlen))
1222 return -EFAULT;
1223 return 0;
1da177e4
LT		 1224}
1225
a5b5bb9a
IM		 1226/*
1227 * Initialize an sk_lock.
1228 *
1229 * (We also register the sk_lock with the lock validator.)
1230 */
b6f99a21 1231static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1232{
ed07536e
PZ		 1233 sock_lock_init_class_and_name(sk,
1234 af_family_slock_key_strings[sk->sk_family],
1235 af_family_slock_keys + sk->sk_family,
1236 af_family_key_strings[sk->sk_family],
1237 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1238}
1239
4dc6dc71
ED		 1240/*
1241 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1242 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1243 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1244 */
f1a6c4da
PE		 1245static void sock_copy(struct sock *nsk, const struct sock *osk)
1246{
1247#ifdef CONFIG_SECURITY_NETWORK
1248 void *sptr = nsk->sk_security;
1249#endif
68835aba
ED		 1250 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1251
1252 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1253 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1254
f1a6c4da
PE		 1255#ifdef CONFIG_SECURITY_NETWORK
1256 nsk->sk_security = sptr;
1257 security_sk_clone(osk, nsk);
1258#endif
1259}
1260
fcbdf09d
OP		 1261void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1262{
1263 unsigned long nulls1, nulls2;
1264
1265 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1266 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1267 if (nulls1 > nulls2)
1268 swap(nulls1, nulls2);
1269
1270 if (nulls1 != 0)
1271 memset((char *)sk, 0, nulls1);
1272 memset((char *)sk + nulls1 + sizeof(void *), 0,
1273 nulls2 - nulls1 - sizeof(void *));
1274 memset((char *)sk + nulls2 + sizeof(void *), 0,
1275 size - nulls2 - sizeof(void *));
1276}
1277EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1278
2e4afe7b
PE		 1279static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1280 int family)
c308c1b2
PE		 1281{
1282 struct sock *sk;
1283 struct kmem_cache *slab;
1284
1285 slab = prot->slab;
e912b114
ED		 1286 if (slab != NULL) {
1287 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1288 if (!sk)
1289 return sk;
1290 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1291 if (prot->clear_sk)
1292 prot->clear_sk(sk, prot->obj_size);
1293 else
1294 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1295 }
fcbdf09d 1296 } else
c308c1b2
PE		 1297 sk = kmalloc(prot->obj_size, priority);
1298
2e4afe7b 1299 if (sk != NULL) {
a98b65a3
VN		 1300 kmemcheck_annotate_bitfield(sk, flags);
1301
2e4afe7b
PE		 1302 if (security_sk_alloc(sk, family, priority))
1303 goto out_free;
1304
1305 if (!try_module_get(prot->owner))
1306 goto out_free_sec;
e022f0b4 1307 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1308 }
1309
c308c1b2 1310 return sk;
2e4afe7b
PE		 1311
1312out_free_sec:
1313 security_sk_free(sk);
1314out_free:
1315 if (slab != NULL)
1316 kmem_cache_free(slab, sk);
1317 else
1318 kfree(sk);
1319 return NULL;
c308c1b2
PE		 1320}
1321
1322static void sk_prot_free(struct proto *prot, struct sock *sk)
1323{
1324 struct kmem_cache *slab;
2e4afe7b 1325 struct module *owner;
c308c1b2 1326
2e4afe7b 1327 owner = prot->owner;
c308c1b2 1328 slab = prot->slab;
2e4afe7b
PE		 1329
1330 security_sk_free(sk);
c308c1b2
PE		 1331 if (slab != NULL)
1332 kmem_cache_free(slab, sk);
1333 else
1334 kfree(sk);
2e4afe7b 1335 module_put(owner);
c308c1b2
PE		 1336}
1337
86f8515f 1338#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
6ffd4641 1339void sock_update_netprioidx(struct sock *sk)
5bc1421e 1340{
5bc1421e
NH		 1341 if (in_interrupt())
1342 return;
2b73bc65 1343
6ffd4641 1344 sk->sk_cgrp_prioidx = task_netprioidx(current);
5bc1421e
NH		 1345}
1346EXPORT_SYMBOL_GPL(sock_update_netprioidx);
f8451725
HX		 1347#endif
1348
1da177e4
LT		 1349/**
1350 * sk_alloc - All socket objects are allocated here
c4ea43c5 1351 * @net: the applicable net namespace
4dc3b16b
PP		 1352 * @family: protocol family
1353 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1354 * @prot: struct proto associated with this new sock instance
1da177e4 1355 */
1b8d7ae4 1356struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1357 struct proto *prot)
1da177e4 1358{
c308c1b2 1359 struct sock *sk;
1da177e4 1360
154adbc8 1361 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1362 if (sk) {
154adbc8
PE		 1363 sk->sk_family = family;
1364 /*
1365 * See comment in struct sock definition to understand
1366 * why we need sk_prot_creator -acme
1367 */
1368 sk->sk_prot = sk->sk_prot_creator = prot;
1369 sock_lock_init(sk);
3b1e0a65 1370 sock_net_set(sk, get_net(net));
d66ee058 1371 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1372
211d2f97 1373 sock_update_classid(sk);
6ffd4641 1374 sock_update_netprioidx(sk);
1da177e4 1375 }
a79af59e 1376
2e4afe7b 1377 return sk;
1da177e4 1378}
2a91525c 1379EXPORT_SYMBOL(sk_alloc);
1da177e4 1380
2b85a34e 1381static void __sk_free(struct sock *sk)
1da177e4
LT		 1382{
1383 struct sk_filter *filter;
1da177e4
LT		 1384
1385 if (sk->sk_destruct)
1386 sk->sk_destruct(sk);
1387
a898def2
PM		 1388 filter = rcu_dereference_check(sk->sk_filter,
1389 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1390 if (filter) {
309dd5fc 1391 sk_filter_uncharge(sk, filter);
a9b3cd7f 1392 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1393 }
1394
08e29af3 1395 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1396
1397 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1398 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1399 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1400
109f6e39
EB		 1401 if (sk->sk_peer_cred)
1402 put_cred(sk->sk_peer_cred);
1403 put_pid(sk->sk_peer_pid);
3b1e0a65 1404 put_net(sock_net(sk));
c308c1b2 1405 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1406}
2b85a34e
ED		 1407
1408void sk_free(struct sock *sk)
1409{
1410 /*
25985edc 1411 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1412 * some packets are still in some tx queue.
1413 * If not null, sock_wfree() will call __sk_free(sk) later
1414 */
1415 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1416 __sk_free(sk);
1417}
2a91525c 1418EXPORT_SYMBOL(sk_free);
1da177e4 1419
edf02087 1420/*
25985edc
LDM		 1421 * Last sock_put should drop reference to sk->sk_net. It has already
1422 * been dropped in sk_change_net. Taking reference to stopping namespace
edf02087 1423 * is not an option.
25985edc 1424 * Take reference to a socket to remove it from hash _alive_ and after that
edf02087
DL		 1425 * destroy it in the context of init_net.
1426 */
1427void sk_release_kernel(struct sock *sk)
1428{
1429 if (sk == NULL || sk->sk_socket == NULL)
1430 return;
1431
1432 sock_hold(sk);
1433 sock_release(sk->sk_socket);
65a18ec5 1434 release_net(sock_net(sk));
3b1e0a65 1435 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1436 sock_put(sk);
1437}
45af1754 1438EXPORT_SYMBOL(sk_release_kernel);
edf02087 1439
475f1b52
SR		 1440static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1441{
1442 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1443 sock_update_memcg(newsk);
1444}
1445
e56c57d0
ED		 1446/**
1447 * sk_clone_lock - clone a socket, and lock its clone
1448 * @sk: the socket to clone
1449 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1450 *
1451 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1452 */
1453struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1454{
8fd1d178 1455 struct sock *newsk;
278571ba 1456 bool is_charged = true;
87d11ceb 1457
8fd1d178 1458 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1459 if (newsk != NULL) {
1460 struct sk_filter *filter;
1461
892c141e 1462 sock_copy(newsk, sk);
87d11ceb
ACM		 1463
1464 /* SANITY */
3b1e0a65 1465 get_net(sock_net(newsk));
87d11ceb
ACM		 1466 sk_node_init(&newsk->sk_node);
1467 sock_lock_init(newsk);
1468 bh_lock_sock(newsk);
fa438ccf 1469 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1470 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1471
1472 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1473 /*
1474 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1475 */
1476 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1477 atomic_set(&newsk->sk_omem_alloc, 0);
1478 skb_queue_head_init(&newsk->sk_receive_queue);
1479 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1480#ifdef CONFIG_NET_DMA
1481 skb_queue_head_init(&newsk->sk_async_wait_queue);
1482#endif
87d11ceb 1483
b6c6712a 1484 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1485 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1486 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1487 af_callback_keys + newsk->sk_family,
1488 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1489
1490 newsk->sk_dst_cache = NULL;
1491 newsk->sk_wmem_queued = 0;
1492 newsk->sk_forward_alloc = 0;
1493 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1494 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1495
1496 sock_reset_flag(newsk, SOCK_DONE);
1497 skb_queue_head_init(&newsk->sk_error_queue);
1498
0d7da9dd 1499 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb 1500 if (filter != NULL)
278571ba
AS		 1501 /* though it's an empty new sock, the charging may fail
1502 * if sysctl_optmem_max was changed between creation of
1503 * original socket and cloning
1504 */
1505 is_charged = sk_filter_charge(newsk, filter);
87d11ceb 1506
278571ba 1507 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk))) {
87d11ceb
ACM		 1508 /* It is still raw copy of parent, so invalidate
1509 * destructor and make plain sk_free() */
1510 newsk->sk_destruct = NULL;
b0691c8e 1511 bh_unlock_sock(newsk);
87d11ceb
ACM		 1512 sk_free(newsk);
1513 newsk = NULL;
1514 goto out;
1515 }
1516
1517 newsk->sk_err = 0;
1518 newsk->sk_priority = 0;
4dc6dc71
ED		 1519 /*
1520 * Before updating sk_refcnt, we must commit prior changes to memory
1521 * (Documentation/RCU/rculist_nulls.txt for details)
1522 */
1523 smp_wmb();
87d11ceb
ACM		 1524 atomic_set(&newsk->sk_refcnt, 2);
1525
1526 /*
1527 * Increment the counter in the same struct proto as the master
1528 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1529 * is the same as sk->sk_prot->socks, as this field was copied
1530 * with memcpy).
1531 *
1532 * This _changes_ the previous behaviour, where
1533 * tcp_create_openreq_child always was incrementing the
1534 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1535 * to be taken into account in all callers. -acme
1536 */
1537 sk_refcnt_debug_inc(newsk);
972692e0 1538 sk_set_socket(newsk, NULL);
43815482 1539 newsk->sk_wq = NULL;
87d11ceb 1540
f3f511e1
GC		 1541 sk_update_clone(sk, newsk);
1542
87d11ceb 1543 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1544 sk_sockets_allocated_inc(newsk);
704da560 1545
08e29af3 1546 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1547 net_enable_timestamp();
87d11ceb
ACM		 1548 }
1549out:
1550 return newsk;
1551}
e56c57d0 1552EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1553
9958089a
AK		 1554void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1555{
1556 __sk_dst_set(sk, dst);
1557 sk->sk_route_caps = dst->dev->features;
1558 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1559 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1560 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1561 if (sk_can_gso(sk)) {
82cc1a7a 1562 if (dst->header_len) {
9958089a 1563 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1564 } else {
9958089a 1565 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1566 sk->sk_gso_max_size = dst->dev->gso_max_size;
1485348d 1567 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
82cc1a7a 1568 }
9958089a
AK		 1569 }
1570}
1571EXPORT_SYMBOL_GPL(sk_setup_caps);
1572
1da177e4
LT		 1573/*
1574 * Simple resource managers for sockets.
1575 */
1576
1577
4ec93edb
YH		 1578/*
1579 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1580 */
1581void sock_wfree(struct sk_buff *skb)
1582{
1583 struct sock *sk = skb->sk;
d99927f4 1584 unsigned int len = skb->truesize;
1da177e4 1585
d99927f4
ED		 1586 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1587 /*
1588 * Keep a reference on sk_wmem_alloc, this will be released
1589 * after sk_write_space() call
1590 */
1591 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1592 sk->sk_write_space(sk);
d99927f4
ED		 1593 len = 1;
1594 }
2b85a34e 1595 /*
d99927f4
ED		 1596 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1597 * could not do because of in-flight packets
2b85a34e 1598 */
d99927f4 1599 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1600 __sk_free(sk);
1da177e4 1601}
2a91525c 1602EXPORT_SYMBOL(sock_wfree);
1da177e4 1603
f2f872f9
ED		 1604void skb_orphan_partial(struct sk_buff *skb)
1605{
1606 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1607 * so we do not completely orphan skb, but transfert all
1608 * accounted bytes but one, to avoid unexpected reorders.
1609 */
1610 if (skb->destructor == sock_wfree
1611#ifdef CONFIG_INET
1612 || skb->destructor == tcp_wfree
1613#endif
1614 ) {
1615 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1616 skb->truesize = 1;
1617 } else {
1618 skb_orphan(skb);
1619 }
1620}
1621EXPORT_SYMBOL(skb_orphan_partial);
1622
4ec93edb
YH		 1623/*
1624 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1625 */
1626void sock_rfree(struct sk_buff *skb)
1627{
1628 struct sock *sk = skb->sk;
d361fd59 1629 unsigned int len = skb->truesize;
1da177e4 1630
d361fd59
ED		 1631 atomic_sub(len, &sk->sk_rmem_alloc);
1632 sk_mem_uncharge(sk, len);
1da177e4 1633}
2a91525c 1634EXPORT_SYMBOL(sock_rfree);
1da177e4 1635
41063e9d
DM		 1636void sock_edemux(struct sk_buff *skb)
1637{
e812347c
ED		 1638 struct sock *sk = skb->sk;
1639
1c463e57 1640#ifdef CONFIG_INET
e812347c
ED		 1641 if (sk->sk_state == TCP_TIME_WAIT)
1642 inet_twsk_put(inet_twsk(sk));
1643 else
1c463e57 1644#endif
e812347c 1645 sock_put(sk);
41063e9d
DM		 1646}
1647EXPORT_SYMBOL(sock_edemux);
1da177e4 1648
976d0201 1649kuid_t sock_i_uid(struct sock *sk)
1da177e4 1650{
976d0201 1651 kuid_t uid;
1da177e4 1652
f064af1e 1653 read_lock_bh(&sk->sk_callback_lock);
976d0201 1654 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1655 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1656 return uid;
1657}
2a91525c 1658EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1659
1660unsigned long sock_i_ino(struct sock *sk)
1661{
1662 unsigned long ino;
1663
f064af1e 1664 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1665 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1666 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1667 return ino;
1668}
2a91525c 1669EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1670
1671/*
1672 * Allocate a skb from the socket's send buffer.
1673 */
86a76caf 1674struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1675 gfp_t priority)
1da177e4
LT		 1676{
1677 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1678 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1679 if (skb) {
1680 skb_set_owner_w(skb, sk);
1681 return skb;
1682 }
1683 }
1684 return NULL;
1685}
2a91525c 1686EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1687
4ec93edb 1688/*
1da177e4 1689 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1690 */
dd0fc66f 1691void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1692{
95c96174 1693 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1694 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1695 void *mem;
1696 /* First do the add, to avoid the race if kmalloc
4ec93edb 1697 * might sleep.
1da177e4
LT		 1698 */
1699 atomic_add(size, &sk->sk_omem_alloc);
1700 mem = kmalloc(size, priority);
1701 if (mem)
1702 return mem;
1703 atomic_sub(size, &sk->sk_omem_alloc);
1704 }
1705 return NULL;
1706}
2a91525c 1707EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1708
1709/*
1710 * Free an option memory block.
1711 */
1712void sock_kfree_s(struct sock *sk, void *mem, int size)
1713{
1714 kfree(mem);
1715 atomic_sub(size, &sk->sk_omem_alloc);
1716}
2a91525c 1717EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1718
1719/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1720 I think, these locks should be removed for datagram sockets.
1721 */
2a91525c 1722static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1723{
1724 DEFINE_WAIT(wait);
1725
1726 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1727 for (;;) {
1728 if (!timeo)
1729 break;
1730 if (signal_pending(current))
1731 break;
1732 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1733 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1734 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1735 break;
1736 if (sk->sk_shutdown & SEND_SHUTDOWN)
1737 break;
1738 if (sk->sk_err)
1739 break;
1740 timeo = schedule_timeout(timeo);
1741 }
aa395145 1742 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1743 return timeo;
1744}
1745
1746
1747/*
1748 * Generic send/receive buffer handlers
1749 */
1750
4cc7f68d
HX		 1751struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1752 unsigned long data_len, int noblock,
28d64271 1753 int *errcode, int max_page_order)
1da177e4 1754{
28d64271
ED		 1755 struct sk_buff *skb = NULL;
1756 unsigned long chunk;
7d877f3b 1757 gfp_t gfp_mask;
1da177e4
LT		 1758 long timeo;
1759 int err;
cc9b17ad 1760 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
28d64271
ED		 1761 struct page *page;
1762 int i;
cc9b17ad
JW		 1763
1764 err = -EMSGSIZE;
1765 if (npages > MAX_SKB_FRAGS)
1766 goto failure;
1da177e4 1767
1da177e4 1768 timeo = sock_sndtimeo(sk, noblock);
28d64271 1769 while (!skb) {
1da177e4
LT		 1770 err = sock_error(sk);
1771 if (err != 0)
1772 goto failure;
1773
1774 err = -EPIPE;
1775 if (sk->sk_shutdown & SEND_SHUTDOWN)
1776 goto failure;
1777
28d64271
ED		 1778 if (atomic_read(&sk->sk_wmem_alloc) >= sk->sk_sndbuf) {
1779 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1780 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1781 err = -EAGAIN;
1782 if (!timeo)
1783 goto failure;
1784 if (signal_pending(current))
1785 goto interrupted;
1786 timeo = sock_wait_for_wmem(sk, timeo);
1787 continue;
1788 }
1da177e4 1789
28d64271
ED		 1790 err = -ENOBUFS;
1791 gfp_mask = sk->sk_allocation;
1792 if (gfp_mask & __GFP_WAIT)
1793 gfp_mask |= __GFP_REPEAT;
1794
1795 skb = alloc_skb(header_len, gfp_mask);
1796 if (!skb)
1da177e4 1797 goto failure;
28d64271
ED		 1798
1799 skb->truesize += data_len;
1800
1801 for (i = 0; npages > 0; i++) {
1802 int order = max_page_order;
1803
1804 while (order) {
1805 if (npages >= 1 << order) {
1806 page = alloc_pages(sk->sk_allocation |
ed98df33
ED		 1807 __GFP_COMP |
1808 __GFP_NOWARN |
1809 __GFP_NORETRY,
28d64271
ED		 1810 order);
1811 if (page)
1812 goto fill_page;
1813 }
1814 order--;
1815 }
1816 page = alloc_page(sk->sk_allocation);
1817 if (!page)
1818 goto failure;
1819fill_page:
1820 chunk = min_t(unsigned long, data_len,
1821 PAGE_SIZE << order);
1822 skb_fill_page_desc(skb, i, page, 0, chunk);
1823 data_len -= chunk;
1824 npages -= 1 << order;
1da177e4 1825 }
1da177e4
LT		 1826 }
1827
1828 skb_set_owner_w(skb, sk);
1829 return skb;
1830
1831interrupted:
1832 err = sock_intr_errno(timeo);
1833failure:
28d64271 1834 kfree_skb(skb);
1da177e4
LT		 1835 *errcode = err;
1836 return NULL;
1837}
4cc7f68d 1838EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1839
4ec93edb 1840struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1841 int noblock, int *errcode)
1842{
28d64271 1843 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1844}
2a91525c 1845EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1846
5640f768
ED		 1847/* On 32bit arches, an skb frag is limited to 2^15 */
1848#define SKB_FRAG_PAGE_ORDER get_order(32768)
1849
400dfd3a
ED		 1850/**
1851 * skb_page_frag_refill - check that a page_frag contains enough room
1852 * @sz: minimum size of the fragment we want to get
1853 * @pfrag: pointer to page_frag
1854 * @prio: priority for memory allocation
1855 *
1856 * Note: While this allocator tries to use high order pages, there is
1857 * no guarantee that allocations succeed. Therefore, @sz MUST be
1858 * less or equal than PAGE_SIZE.
1859 */
1860bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t prio)
5640f768
ED		 1861{
1862 int order;
1863
1864 if (pfrag->page) {
1865 if (atomic_read(&pfrag->page->_count) == 1) {
1866 pfrag->offset = 0;
1867 return true;
1868 }
400dfd3a 1869 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1870 return true;
1871 put_page(pfrag->page);
1872 }
1873
097b4f19 1874 order = SKB_FRAG_PAGE_ORDER;
5640f768 1875 do {
400dfd3a 1876 gfp_t gfp = prio;
5640f768
ED		 1877
1878 if (order)
ed98df33 1879 gfp |= __GFP_COMP | __GFP_NOWARN | __GFP_NORETRY;
5640f768
ED		 1880 pfrag->page = alloc_pages(gfp, order);
1881 if (likely(pfrag->page)) {
1882 pfrag->offset = 0;
1883 pfrag->size = PAGE_SIZE << order;
1884 return true;
1885 }
1886 } while (--order >= 0);
1887
400dfd3a
ED		 1888 return false;
1889}
1890EXPORT_SYMBOL(skb_page_frag_refill);
1891
1892bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1893{
1894 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1895 return true;
1896
5640f768
ED		 1897 sk_enter_memory_pressure(sk);
1898 sk_stream_moderate_sndbuf(sk);
1899 return false;
1900}
1901EXPORT_SYMBOL(sk_page_frag_refill);
1902
1da177e4 1903static void __lock_sock(struct sock *sk)
f39234d6
NK		 1904 __releases(&sk->sk_lock.slock)
1905 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1906{
1907 DEFINE_WAIT(wait);
1908
e71a4783 1909 for (;;) {
1da177e4
LT		 1910 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1911 TASK_UNINTERRUPTIBLE);
1912 spin_unlock_bh(&sk->sk_lock.slock);
1913 schedule();
1914 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1915 if (!sock_owned_by_user(sk))
1da177e4
LT		 1916 break;
1917 }
1918 finish_wait(&sk->sk_lock.wq, &wait);
1919}
1920
1921static void __release_sock(struct sock *sk)
f39234d6
NK		 1922 __releases(&sk->sk_lock.slock)
1923 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1924{
1925 struct sk_buff *skb = sk->sk_backlog.head;
1926
1927 do {
1928 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1929 bh_unlock_sock(sk);
1930
1931 do {
1932 struct sk_buff *next = skb->next;
1933
e4cbb02a 1934 prefetch(next);
7fee226a 1935 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1936 skb->next = NULL;
c57943a1 1937 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1938
1939 /*
1940 * We are in process context here with softirqs
1941 * disabled, use cond_resched_softirq() to preempt.
1942 * This is safe to do because we've taken the backlog
1943 * queue private:
1944 */
1945 cond_resched_softirq();
1946
1947 skb = next;
1948 } while (skb != NULL);
1949
1950 bh_lock_sock(sk);
e71a4783 1951 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1952
1953 /*
1954 * Doing the zeroing here guarantee we can not loop forever
1955 * while a wild producer attempts to flood us.
1956 */
1957 sk->sk_backlog.len = 0;
1da177e4
LT		 1958}
1959
1960/**
1961 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1962 * @sk: sock to wait on
1963 * @timeo: for how long
1da177e4
LT		 1964 *
1965 * Now socket state including sk->sk_err is changed only under lock,
1966 * hence we may omit checks after joining wait queue.
1967 * We check receive queue before schedule() only as optimization;
1968 * it is very likely that release_sock() added new data.
1969 */
1970int sk_wait_data(struct sock *sk, long *timeo)
1971{
1972 int rc;
1973 DEFINE_WAIT(wait);
1974
aa395145 1975 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1976 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1977 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1978 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1979 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1980 return rc;
1981}
1da177e4
LT		 1982EXPORT_SYMBOL(sk_wait_data);
1983
3ab224be
HA		 1984/**
1985 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1986 * @sk: socket
1987 * @size: memory size to allocate
1988 * @kind: allocation type
1989 *
1990 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1991 * rmem allocation. This function assumes that protocols which have
1992 * memory_pressure use sk_wmem_queued as write buffer accounting.
1993 */
1994int __sk_mem_schedule(struct sock *sk, int size, int kind)
1995{
1996 struct proto *prot = sk->sk_prot;
1997 int amt = sk_mem_pages(size);
8d987e5c 1998 long allocated;
e1aab161 1999 int parent_status = UNDER_LIMIT;
3ab224be
HA		 2000
2001 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 2002
e1aab161 2003 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 2004
2005 /* Under limit. */
e1aab161
GC		 2006 if (parent_status == UNDER_LIMIT &&
2007 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2008 sk_leave_memory_pressure(sk);
3ab224be
HA		 2009 return 1;
2010 }
2011
e1aab161
GC		 2012 /* Under pressure. (we or our parents) */
2013 if ((parent_status > SOFT_LIMIT) ||
2014 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2015 sk_enter_memory_pressure(sk);
3ab224be 2016
e1aab161
GC		 2017 /* Over hard limit (we or our parents) */
2018 if ((parent_status == OVER_LIMIT) ||
2019 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 2020 goto suppress_allocation;
2021
2022 /* guarantee minimum buffer size under pressure */
2023 if (kind == SK_MEM_RECV) {
2024 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2025 return 1;
180d8cd9 2026
3ab224be
HA		 2027 } else { /* SK_MEM_SEND */
2028 if (sk->sk_type == SOCK_STREAM) {
2029 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2030 return 1;
2031 } else if (atomic_read(&sk->sk_wmem_alloc) <
2032 prot->sysctl_wmem[0])
2033 return 1;
2034 }
2035
180d8cd9 2036 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2037 int alloc;
2038
180d8cd9 2039 if (!sk_under_memory_pressure(sk))
1748376b 2040 return 1;
180d8cd9
GC		 2041 alloc = sk_sockets_allocated_read_positive(sk);
2042 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2043 sk_mem_pages(sk->sk_wmem_queued +
2044 atomic_read(&sk->sk_rmem_alloc) +
2045 sk->sk_forward_alloc))
2046 return 1;
2047 }
2048
2049suppress_allocation:
2050
2051 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2052 sk_stream_moderate_sndbuf(sk);
2053
2054 /* Fail only if socket is _under_ its sndbuf.
2055 * In this case we cannot block, so that we have to fail.
2056 */
2057 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2058 return 1;
2059 }
2060
3847ce32
SM		 2061 trace_sock_exceed_buf_limit(sk, prot, allocated);
2062
3ab224be
HA		 2063 /* Alas. Undo changes. */
2064 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2065
0e90b31f 2066 sk_memory_allocated_sub(sk, amt);
180d8cd9 2067
3ab224be
HA		 2068 return 0;
2069}
3ab224be
HA		 2070EXPORT_SYMBOL(__sk_mem_schedule);
2071
2072/**
2073 * __sk_reclaim - reclaim memory_allocated
2074 * @sk: socket
2075 */
2076void __sk_mem_reclaim(struct sock *sk)
2077{
180d8cd9 2078 sk_memory_allocated_sub(sk,
0e90b31f 2079 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
3ab224be
HA		 2080 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
2081
180d8cd9
GC		 2082 if (sk_under_memory_pressure(sk) &&
2083 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2084 sk_leave_memory_pressure(sk);
3ab224be 2085}
3ab224be
HA		 2086EXPORT_SYMBOL(__sk_mem_reclaim);
2087
2088
1da177e4
LT		 2089/*
2090 * Set of default routines for initialising struct proto_ops when
2091 * the protocol does not support a particular function. In certain
2092 * cases where it makes no sense for a protocol to have a "do nothing"
2093 * function, some default processing is provided.
2094 */
2095
2096int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2097{
2098 return -EOPNOTSUPP;
2099}
2a91525c 2100EXPORT_SYMBOL(sock_no_bind);
1da177e4 2101
4ec93edb 2102int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2103 int len, int flags)
2104{
2105 return -EOPNOTSUPP;
2106}
2a91525c 2107EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2108
2109int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2110{
2111 return -EOPNOTSUPP;
2112}
2a91525c 2113EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2114
2115int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2116{
2117 return -EOPNOTSUPP;
2118}
2a91525c 2119EXPORT_SYMBOL(sock_no_accept);
1da177e4 2120
4ec93edb 2121int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2122 int *len, int peer)
2123{
2124 return -EOPNOTSUPP;
2125}
2a91525c 2126EXPORT_SYMBOL(sock_no_getname);
1da177e4 2127
2a91525c 2128unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2129{
2130 return 0;
2131}
2a91525c 2132EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2133
2134int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2135{
2136 return -EOPNOTSUPP;
2137}
2a91525c 2138EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2139
2140int sock_no_listen(struct socket *sock, int backlog)
2141{
2142 return -EOPNOTSUPP;
2143}
2a91525c 2144EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2145
2146int sock_no_shutdown(struct socket *sock, int how)
2147{
2148 return -EOPNOTSUPP;
2149}
2a91525c 2150EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2151
2152int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2153 char __user *optval, unsigned int optlen)
1da177e4
LT		 2154{
2155 return -EOPNOTSUPP;
2156}
2a91525c 2157EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2158
2159int sock_no_getsockopt(struct socket *sock, int level, int optname,
2160 char __user *optval, int __user *optlen)
2161{
2162 return -EOPNOTSUPP;
2163}
2a91525c 2164EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 2165
2166int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2167 size_t len)
2168{
2169 return -EOPNOTSUPP;
2170}
2a91525c 2171EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 2172
2173int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2174 size_t len, int flags)
2175{
2176 return -EOPNOTSUPP;
2177}
2a91525c 2178EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2179
2180int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2181{
2182 /* Mirror missing mmap method error code */
2183 return -ENODEV;
2184}
2a91525c 2185EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2186
2187ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2188{
2189 ssize_t res;
2190 struct msghdr msg = {.msg_flags = flags};
2191 struct kvec iov;
2192 char *kaddr = kmap(page);
2193 iov.iov_base = kaddr + offset;
2194 iov.iov_len = size;
2195 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2196 kunmap(page);
2197 return res;
2198}
2a91525c 2199EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2200
2201/*
2202 * Default Socket Callbacks
2203 */
2204
2205static void sock_def_wakeup(struct sock *sk)
2206{
43815482
ED		 2207 struct socket_wq *wq;
2208
2209 rcu_read_lock();
2210 wq = rcu_dereference(sk->sk_wq);
2211 if (wq_has_sleeper(wq))
2212 wake_up_interruptible_all(&wq->wait);
2213 rcu_read_unlock();
1da177e4
LT		 2214}
2215
2216static void sock_def_error_report(struct sock *sk)
2217{
43815482
ED		 2218 struct socket_wq *wq;
2219
2220 rcu_read_lock();
2221 wq = rcu_dereference(sk->sk_wq);
2222 if (wq_has_sleeper(wq))
2223 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2224 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2225 rcu_read_unlock();
1da177e4
LT		 2226}
2227
676d2369 2228static void sock_def_readable(struct sock *sk)
1da177e4 2229{
43815482
ED		 2230 struct socket_wq *wq;
2231
2232 rcu_read_lock();
2233 wq = rcu_dereference(sk->sk_wq);
2234 if (wq_has_sleeper(wq))
2c6607c6 2235 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2236 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2237 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2238 rcu_read_unlock();
1da177e4
LT		 2239}
2240
2241static void sock_def_write_space(struct sock *sk)
2242{
43815482
ED		 2243 struct socket_wq *wq;
2244
2245 rcu_read_lock();
1da177e4
LT		 2246
2247 /* Do not wake up a writer until he can make "significant"
2248 * progress. --DaveM
2249 */
e71a4783 2250 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2251 wq = rcu_dereference(sk->sk_wq);
2252 if (wq_has_sleeper(wq))
2253 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2254 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2255
2256 /* Should agree with poll, otherwise some programs break */
2257 if (sock_writeable(sk))
8d8ad9d7 2258 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2259 }
2260
43815482 2261 rcu_read_unlock();
1da177e4
LT		 2262}
2263
2264static void sock_def_destruct(struct sock *sk)
2265{
a51482bd 2266 kfree(sk->sk_protinfo);
1da177e4
LT		 2267}
2268
2269void sk_send_sigurg(struct sock *sk)
2270{
2271 if (sk->sk_socket && sk->sk_socket->file)
2272 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2273 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2274}
2a91525c 2275EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2276
2277void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2278 unsigned long expires)
2279{
2280 if (!mod_timer(timer, expires))
2281 sock_hold(sk);
2282}
1da177e4
LT		 2283EXPORT_SYMBOL(sk_reset_timer);
2284
2285void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2286{
25cc4ae9 2287 if (del_timer(timer))
1da177e4
LT		 2288 __sock_put(sk);
2289}
1da177e4
LT		 2290EXPORT_SYMBOL(sk_stop_timer);
2291
2292void sock_init_data(struct socket *sock, struct sock *sk)
2293{
2294 skb_queue_head_init(&sk->sk_receive_queue);
2295 skb_queue_head_init(&sk->sk_write_queue);
2296 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 2297#ifdef CONFIG_NET_DMA
2298 skb_queue_head_init(&sk->sk_async_wait_queue);
2299#endif
1da177e4
LT		 2300
2301 sk->sk_send_head = NULL;
2302
2303 init_timer(&sk->sk_timer);
4ec93edb 2304
1da177e4
LT		 2305 sk->sk_allocation = GFP_KERNEL;
2306 sk->sk_rcvbuf = sysctl_rmem_default;
2307 sk->sk_sndbuf = sysctl_wmem_default;
2308 sk->sk_state = TCP_CLOSE;
972692e0 2309 sk_set_socket(sk, sock);
1da177e4
LT		 2310
2311 sock_set_flag(sk, SOCK_ZAPPED);
2312
e71a4783 2313 if (sock) {
1da177e4 2314 sk->sk_type = sock->type;
43815482 2315 sk->sk_wq = sock->wq;
1da177e4
LT		 2316 sock->sk = sk;
2317 } else
43815482 2318 sk->sk_wq = NULL;
1da177e4 2319
b6c6712a 2320 spin_lock_init(&sk->sk_dst_lock);
1da177e4 2321 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2322 lockdep_set_class_and_name(&sk->sk_callback_lock,
2323 af_callback_keys + sk->sk_family,
2324 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2325
2326 sk->sk_state_change = sock_def_wakeup;
2327 sk->sk_data_ready = sock_def_readable;
2328 sk->sk_write_space = sock_def_write_space;
2329 sk->sk_error_report = sock_def_error_report;
2330 sk->sk_destruct = sock_def_destruct;
2331
5640f768
ED		 2332 sk->sk_frag.page = NULL;
2333 sk->sk_frag.offset = 0;
ef64a54f 2334 sk->sk_peek_off = -1;
1da177e4 2335
109f6e39
EB		 2336 sk->sk_peer_pid = NULL;
2337 sk->sk_peer_cred = NULL;
1da177e4
LT		 2338 sk->sk_write_pending = 0;
2339 sk->sk_rcvlowat = 1;
2340 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2341 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2342
f37f0afb 2343 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2344
e0d1095a 2345#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2346 sk->sk_napi_id = 0;
64b0dc51 2347 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2348#endif
2349
62748f32 2350 sk->sk_max_pacing_rate = ~0U;
7eec4174 2351 sk->sk_pacing_rate = ~0U;
4dc6dc71
ED		 2352 /*
2353 * Before updating sk_refcnt, we must commit prior changes to memory
2354 * (Documentation/RCU/rculist_nulls.txt for details)
2355 */
2356 smp_wmb();
1da177e4 2357 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2358 atomic_set(&sk->sk_drops, 0);
1da177e4 2359}
2a91525c 2360EXPORT_SYMBOL(sock_init_data);
1da177e4 2361
b5606c2d 2362void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2363{
2364 might_sleep();
a5b5bb9a 2365 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2366 if (sk->sk_lock.owned)
1da177e4 2367 __lock_sock(sk);
d2e9117c 2368 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2369 spin_unlock(&sk->sk_lock.slock);
2370 /*
2371 * The sk_lock has mutex_lock() semantics here:
2372 */
fcc70d5f 2373 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2374 local_bh_enable();
1da177e4 2375}
fcc70d5f 2376EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2377
b5606c2d 2378void release_sock(struct sock *sk)
1da177e4 2379{
a5b5bb9a
IM		 2380 /*
2381 * The sk_lock has mutex_unlock() semantics:
2382 */
2383 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2384
2385 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2386 if (sk->sk_backlog.tail)
2387 __release_sock(sk);
46d3ceab 2388
c3f9b018
ED		 2389 /* Warning : release_cb() might need to release sk ownership,
2390 * ie call sock_release_ownership(sk) before us.
2391 */
46d3ceab
ED		 2392 if (sk->sk_prot->release_cb)
2393 sk->sk_prot->release_cb(sk);
2394
c3f9b018 2395 sock_release_ownership(sk);
a5b5bb9a
IM		 2396 if (waitqueue_active(&sk->sk_lock.wq))
2397 wake_up(&sk->sk_lock.wq);
2398 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2399}
2400EXPORT_SYMBOL(release_sock);
2401
8a74ad60
ED		 2402/**
2403 * lock_sock_fast - fast version of lock_sock
2404 * @sk: socket
2405 *
2406 * This version should be used for very small section, where process wont block
2407 * return false if fast path is taken
2408 * sk_lock.slock locked, owned = 0, BH disabled
2409 * return true if slow path is taken
2410 * sk_lock.slock unlocked, owned = 1, BH enabled
2411 */
2412bool lock_sock_fast(struct sock *sk)
2413{
2414 might_sleep();
2415 spin_lock_bh(&sk->sk_lock.slock);
2416
2417 if (!sk->sk_lock.owned)
2418 /*
2419 * Note : We must disable BH
2420 */
2421 return false;
2422
2423 __lock_sock(sk);
2424 sk->sk_lock.owned = 1;
2425 spin_unlock(&sk->sk_lock.slock);
2426 /*
2427 * The sk_lock has mutex_lock() semantics here:
2428 */
2429 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2430 local_bh_enable();
2431 return true;
2432}
2433EXPORT_SYMBOL(lock_sock_fast);
2434
1da177e4 2435int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2436{
b7aa0bf7 2437 struct timeval tv;
1da177e4 2438 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2439 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2440 tv = ktime_to_timeval(sk->sk_stamp);
2441 if (tv.tv_sec == -1)
1da177e4 2442 return -ENOENT;
b7aa0bf7
ED		 2443 if (tv.tv_sec == 0) {
2444 sk->sk_stamp = ktime_get_real();
2445 tv = ktime_to_timeval(sk->sk_stamp);
2446 }
2447 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2448}
1da177e4
LT		 2449EXPORT_SYMBOL(sock_get_timestamp);
2450
ae40eb1e
ED		 2451int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2452{
2453 struct timespec ts;
2454 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2455 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2456 ts = ktime_to_timespec(sk->sk_stamp);
2457 if (ts.tv_sec == -1)
2458 return -ENOENT;
2459 if (ts.tv_sec == 0) {
2460 sk->sk_stamp = ktime_get_real();
2461 ts = ktime_to_timespec(sk->sk_stamp);
2462 }
2463 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2464}
2465EXPORT_SYMBOL(sock_get_timestampns);
2466
20d49473 2467void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2468{
20d49473 2469 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2470 unsigned long previous_flags = sk->sk_flags;
2471
20d49473
PO		 2472 sock_set_flag(sk, flag);
2473 /*
2474 * we just set one of the two flags which require net
2475 * time stamping, but time stamping might have been on
2476 * already because of the other one
2477 */
08e29af3 2478 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2479 net_enable_timestamp();
1da177e4
LT		 2480 }
2481}
1da177e4 2482
cb820f8e
RC		 2483int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2484 int level, int type)
2485{
2486 struct sock_exterr_skb *serr;
2487 struct sk_buff *skb, *skb2;
2488 int copied, err;
2489
2490 err = -EAGAIN;
2491 skb = skb_dequeue(&sk->sk_error_queue);
2492 if (skb == NULL)
2493 goto out;
2494
2495 copied = skb->len;
2496 if (copied > len) {
2497 msg->msg_flags |= MSG_TRUNC;
2498 copied = len;
2499 }
2500 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2501 if (err)
2502 goto out_free_skb;
2503
2504 sock_recv_timestamp(msg, sk, skb);
2505
2506 serr = SKB_EXT_ERR(skb);
2507 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2508
2509 msg->msg_flags |= MSG_ERRQUEUE;
2510 err = copied;
2511
2512 /* Reset and regenerate socket error */
2513 spin_lock_bh(&sk->sk_error_queue.lock);
2514 sk->sk_err = 0;
2515 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
2516 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
2517 spin_unlock_bh(&sk->sk_error_queue.lock);
2518 sk->sk_error_report(sk);
2519 } else
2520 spin_unlock_bh(&sk->sk_error_queue.lock);
2521
2522out_free_skb:
2523 kfree_skb(skb);
2524out:
2525 return err;
2526}
2527EXPORT_SYMBOL(sock_recv_errqueue);
2528
1da177e4
LT		 2529/*
2530 * Get a socket option on an socket.
2531 *
2532 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2533 * asynchronous errors should be reported by getsockopt. We assume
2534 * this means if you specify SO_ERROR (otherwise whats the point of it).
2535 */
2536int sock_common_getsockopt(struct socket *sock, int level, int optname,
2537 char __user *optval, int __user *optlen)
2538{
2539 struct sock *sk = sock->sk;
2540
2541 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2542}
1da177e4
LT		 2543EXPORT_SYMBOL(sock_common_getsockopt);
2544
3fdadf7d 2545#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2546int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2547 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2548{
2549 struct sock *sk = sock->sk;
2550
1e51f951 2551 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2552 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2553 optval, optlen);
3fdadf7d
DM		 2554 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2555}
2556EXPORT_SYMBOL(compat_sock_common_getsockopt);
2557#endif
2558
1da177e4
LT		 2559int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2560 struct msghdr *msg, size_t size, int flags)
2561{
2562 struct sock *sk = sock->sk;
2563 int addr_len = 0;
2564 int err;
2565
2566 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2567 flags & ~MSG_DONTWAIT, &addr_len);
2568 if (err >= 0)
2569 msg->msg_namelen = addr_len;
2570 return err;
2571}
1da177e4
LT		 2572EXPORT_SYMBOL(sock_common_recvmsg);
2573
2574/*
2575 * Set socket options on an inet socket.
2576 */
2577int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2578 char __user *optval, unsigned int optlen)
1da177e4
LT		 2579{
2580 struct sock *sk = sock->sk;
2581
2582 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2583}
1da177e4
LT		 2584EXPORT_SYMBOL(sock_common_setsockopt);
2585
3fdadf7d 2586#ifdef CONFIG_COMPAT
543d9cfe 2587int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2588 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2589{
2590 struct sock *sk = sock->sk;
2591
543d9cfe
ACM		 2592 if (sk->sk_prot->compat_setsockopt != NULL)
2593 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2594 optval, optlen);
3fdadf7d
DM		 2595 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2596}
2597EXPORT_SYMBOL(compat_sock_common_setsockopt);
2598#endif
2599
1da177e4
LT		 2600void sk_common_release(struct sock *sk)
2601{
2602 if (sk->sk_prot->destroy)
2603 sk->sk_prot->destroy(sk);
2604
2605 /*
2606 * Observation: when sock_common_release is called, processes have
2607 * no access to socket. But net still has.
2608 * Step one, detach it from networking:
2609 *
2610 * A. Remove from hash tables.
2611 */
2612
2613 sk->sk_prot->unhash(sk);
2614
2615 /*
2616 * In this point socket cannot receive new packets, but it is possible
2617 * that some packets are in flight because some CPU runs receiver and
2618 * did hash table lookup before we unhashed socket. They will achieve
2619 * receive queue and will be purged by socket destructor.
2620 *
2621 * Also we still have packets pending on receive queue and probably,
2622 * our own packets waiting in device queues. sock_destroy will drain
2623 * receive queue, but transmitted packets will delay socket destruction
2624 * until the last reference will be released.
2625 */
2626
2627 sock_orphan(sk);
2628
2629 xfrm_sk_free_policy(sk);
2630
e6848976 2631 sk_refcnt_debug_release(sk);
5640f768
ED		 2632
2633 if (sk->sk_frag.page) {
2634 put_page(sk->sk_frag.page);
2635 sk->sk_frag.page = NULL;
2636 }
2637
1da177e4
LT		 2638 sock_put(sk);
2639}
1da177e4
LT		 2640EXPORT_SYMBOL(sk_common_release);
2641
13ff3d6f
PE		 2642#ifdef CONFIG_PROC_FS
2643#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2644struct prot_inuse {
2645 int val[PROTO_INUSE_NR];
2646};
13ff3d6f
PE		 2647
2648static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2649
2650#ifdef CONFIG_NET_NS
2651void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2652{
d6d9ca0f 2653 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2654}
2655EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2656
2657int sock_prot_inuse_get(struct net *net, struct proto *prot)
2658{
2659 int cpu, idx = prot->inuse_idx;
2660 int res = 0;
2661
2662 for_each_possible_cpu(cpu)
2663 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2664
2665 return res >= 0 ? res : 0;
2666}
2667EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2668
2c8c1e72 2669static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2670{
2671 net->core.inuse = alloc_percpu(struct prot_inuse);
2672 return net->core.inuse ? 0 : -ENOMEM;
2673}
2674
2c8c1e72 2675static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2676{
2677 free_percpu(net->core.inuse);
2678}
2679
2680static struct pernet_operations net_inuse_ops = {
2681 .init = sock_inuse_init_net,
2682 .exit = sock_inuse_exit_net,
2683};
2684
2685static __init int net_inuse_init(void)
2686{
2687 if (register_pernet_subsys(&net_inuse_ops))
2688 panic("Cannot initialize net inuse counters");
2689
2690 return 0;
2691}
2692
2693core_initcall(net_inuse_init);
2694#else
1338d466
PE		 2695static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2696
c29a0bc4 2697void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2698{
d6d9ca0f 2699 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2700}
2701EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2702
c29a0bc4 2703int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2704{
2705 int cpu, idx = prot->inuse_idx;
2706 int res = 0;
2707
2708 for_each_possible_cpu(cpu)
2709 res += per_cpu(prot_inuse, cpu).val[idx];
2710
2711 return res >= 0 ? res : 0;
2712}
2713EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2714#endif
13ff3d6f
PE		 2715
2716static void assign_proto_idx(struct proto *prot)
2717{
2718 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2719
2720 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2721 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2722 return;
2723 }
2724
2725 set_bit(prot->inuse_idx, proto_inuse_idx);
2726}
2727
2728static void release_proto_idx(struct proto *prot)
2729{
2730 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2731 clear_bit(prot->inuse_idx, proto_inuse_idx);
2732}
2733#else
2734static inline void assign_proto_idx(struct proto *prot)
2735{
2736}
2737
2738static inline void release_proto_idx(struct proto *prot)
2739{
2740}
2741#endif
2742
b733c007
PE		 2743int proto_register(struct proto *prot, int alloc_slab)
2744{
1da177e4
LT		 2745 if (alloc_slab) {
2746 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2747 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2748 NULL);
1da177e4
LT		 2749
2750 if (prot->slab == NULL) {
e005d193
JP		 2751 pr_crit("%s: Can't create sock SLAB cache!\n",
2752 prot->name);
60e7663d 2753 goto out;
1da177e4 2754 }
2e6599cb
ACM		 2755
2756 if (prot->rsk_prot != NULL) {
faf23422 2757 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2758 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2759 goto out_free_sock_slab;
2760
7e56b5d6 2761 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2762 prot->rsk_prot->obj_size, 0,
20c2df83 2763 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2764
2765 if (prot->rsk_prot->slab == NULL) {
e005d193
JP		 2766 pr_crit("%s: Can't create request sock SLAB cache!\n",
2767 prot->name);
2e6599cb
ACM		 2768 goto out_free_request_sock_slab_name;
2769 }
2770 }
8feaf0c0 2771
6d6ee43e 2772 if (prot->twsk_prot != NULL) {
faf23422 2773 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2774
7e56b5d6 2775 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2776 goto out_free_request_sock_slab;
2777
6d6ee43e 2778 prot->twsk_prot->twsk_slab =
7e56b5d6 2779 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2780 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2781 0,
2782 SLAB_HWCACHE_ALIGN |
2783 prot->slab_flags,
20c2df83 2784 NULL);
6d6ee43e 2785 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2786 goto out_free_timewait_sock_slab_name;
2787 }
1da177e4
LT		 2788 }
2789
36b77a52 2790 mutex_lock(&proto_list_mutex);
1da177e4 2791 list_add(&prot->node, &proto_list);
13ff3d6f 2792 assign_proto_idx(prot);
36b77a52 2793 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2794 return 0;
2795
8feaf0c0 2796out_free_timewait_sock_slab_name:
7e56b5d6 2797 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2798out_free_request_sock_slab:
2799 if (prot->rsk_prot && prot->rsk_prot->slab) {
2800 kmem_cache_destroy(prot->rsk_prot->slab);
2801 prot->rsk_prot->slab = NULL;
2802 }
2e6599cb 2803out_free_request_sock_slab_name:
72150e9b
DC		 2804 if (prot->rsk_prot)
2805 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2806out_free_sock_slab:
2807 kmem_cache_destroy(prot->slab);
2808 prot->slab = NULL;
b733c007
PE		 2809out:
2810 return -ENOBUFS;
1da177e4 2811}
1da177e4
LT		 2812EXPORT_SYMBOL(proto_register);
2813
2814void proto_unregister(struct proto *prot)
2815{
36b77a52 2816 mutex_lock(&proto_list_mutex);
13ff3d6f 2817 release_proto_idx(prot);
0a3f4358 2818 list_del(&prot->node);
36b77a52 2819 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2820
2821 if (prot->slab != NULL) {
2822 kmem_cache_destroy(prot->slab);
2823 prot->slab = NULL;
2824 }
2825
2e6599cb 2826 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2827 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2828 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2829 prot->rsk_prot->slab = NULL;
2830 }
2831
6d6ee43e 2832 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2833 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2834 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2835 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2836 }
1da177e4 2837}
1da177e4
LT		 2838EXPORT_SYMBOL(proto_unregister);
2839
2840#ifdef CONFIG_PROC_FS
1da177e4 2841static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2842 __acquires(proto_list_mutex)
1da177e4 2843{
36b77a52 2844 mutex_lock(&proto_list_mutex);
60f0438a 2845 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2846}
2847
2848static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2849{
60f0438a 2850 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2851}
2852
2853static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2854 __releases(proto_list_mutex)
1da177e4 2855{
36b77a52 2856 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2857}
2858
2859static char proto_method_implemented(const void *method)
2860{
2861 return method == NULL ? 'n' : 'y';
2862}
180d8cd9
GC		 2863static long sock_prot_memory_allocated(struct proto *proto)
2864{
cb75a36c 2865 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2866}
2867
2868static char *sock_prot_memory_pressure(struct proto *proto)
2869{
2870 return proto->memory_pressure != NULL ?
2871 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2872}
1da177e4
LT		 2873
2874static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2875{
180d8cd9 2876
8d987e5c 2877 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2878 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2879 proto->name,
2880 proto->obj_size,
14e943db 2881 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2882 sock_prot_memory_allocated(proto),
2883 sock_prot_memory_pressure(proto),
1da177e4
LT		 2884 proto->max_header,
2885 proto->slab == NULL ? "no" : "yes",
2886 module_name(proto->owner),
2887 proto_method_implemented(proto->close),
2888 proto_method_implemented(proto->connect),
2889 proto_method_implemented(proto->disconnect),
2890 proto_method_implemented(proto->accept),
2891 proto_method_implemented(proto->ioctl),
2892 proto_method_implemented(proto->init),
2893 proto_method_implemented(proto->destroy),
2894 proto_method_implemented(proto->shutdown),
2895 proto_method_implemented(proto->setsockopt),
2896 proto_method_implemented(proto->getsockopt),
2897 proto_method_implemented(proto->sendmsg),
2898 proto_method_implemented(proto->recvmsg),
2899 proto_method_implemented(proto->sendpage),
2900 proto_method_implemented(proto->bind),
2901 proto_method_implemented(proto->backlog_rcv),
2902 proto_method_implemented(proto->hash),
2903 proto_method_implemented(proto->unhash),
2904 proto_method_implemented(proto->get_port),
2905 proto_method_implemented(proto->enter_memory_pressure));
2906}
2907
2908static int proto_seq_show(struct seq_file *seq, void *v)
2909{
60f0438a 2910 if (v == &proto_list)
1da177e4
LT		 2911 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2912 "protocol",
2913 "size",
2914 "sockets",
2915 "memory",
2916 "press",
2917 "maxhdr",
2918 "slab",
2919 "module",
2920 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2921 else
60f0438a 2922 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2923 return 0;
2924}
2925
f690808e 2926static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2927 .start = proto_seq_start,
2928 .next = proto_seq_next,
2929 .stop = proto_seq_stop,
2930 .show = proto_seq_show,
2931};
2932
2933static int proto_seq_open(struct inode *inode, struct file *file)
2934{
14e943db
ED		 2935 return seq_open_net(inode, file, &proto_seq_ops,
2936 sizeof(struct seq_net_private));
1da177e4
LT		 2937}
2938
9a32144e 2939static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2940 .owner = THIS_MODULE,
2941 .open = proto_seq_open,
2942 .read = seq_read,
2943 .llseek = seq_lseek,
14e943db
ED		 2944 .release = seq_release_net,
2945};
2946
2947static __net_init int proto_init_net(struct net *net)
2948{
d4beaa66 2949 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 2950 return -ENOMEM;
2951
2952 return 0;
2953}
2954
2955static __net_exit void proto_exit_net(struct net *net)
2956{
ece31ffd 2957 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 2958}
2959
2960
2961static __net_initdata struct pernet_operations proto_net_ops = {
2962 .init = proto_init_net,
2963 .exit = proto_exit_net,
1da177e4
LT		 2964};
2965
2966static int __init proto_init(void)
2967{
14e943db 2968 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2969}
2970
2971subsys_initcall(proto_init);
2972
2973#endif /* PROC_FS */
Linux kernel - Deliverables
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