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net: Eliminate no_check from protosw
[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
f545a38f 494 if (sk_rcvqueues_full(sk, skb, 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:
787 sk->sk_no_check = valbool;
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 }
851 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
852 val & SOF_TIMESTAMPING_TX_HARDWARE);
853 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
854 val & SOF_TIMESTAMPING_TX_SOFTWARE);
855 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
856 val & SOF_TIMESTAMPING_RX_HARDWARE);
857 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
858 sock_enable_timestamp(sk,
859 SOCK_TIMESTAMPING_RX_SOFTWARE);
860 else
861 sock_disable_timestamp(sk,
08e29af3 862 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 863 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
864 val & SOF_TIMESTAMPING_SOFTWARE);
865 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
866 val & SOF_TIMESTAMPING_SYS_HARDWARE);
867 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
868 val & SOF_TIMESTAMPING_RAW_HARDWARE);
869 break;
870
e71a4783
SH		 871 case SO_RCVLOWAT:
872 if (val < 0)
873 val = INT_MAX;
874 sk->sk_rcvlowat = val ? : 1;
875 break;
876
877 case SO_RCVTIMEO:
878 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
879 break;
880
881 case SO_SNDTIMEO:
882 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
883 break;
1da177e4 884
e71a4783
SH		 885 case SO_ATTACH_FILTER:
886 ret = -EINVAL;
887 if (optlen == sizeof(struct sock_fprog)) {
888 struct sock_fprog fprog;
1da177e4 889
e71a4783
SH		 890 ret = -EFAULT;
891 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 892 break;
e71a4783
SH		 893
894 ret = sk_attach_filter(&fprog, sk);
895 }
896 break;
897
898 case SO_DETACH_FILTER:
55b33325 899 ret = sk_detach_filter(sk);
e71a4783 900 break;
1da177e4 901
d59577b6
VB		 902 case SO_LOCK_FILTER:
903 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
904 ret = -EPERM;
905 else
906 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
907 break;
908
e71a4783
SH		 909 case SO_PASSSEC:
910 if (valbool)
911 set_bit(SOCK_PASSSEC, &sock->flags);
912 else
913 clear_bit(SOCK_PASSSEC, &sock->flags);
914 break;
4a19ec58 915 case SO_MARK:
5e1fccc0 916 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 917 ret = -EPERM;
2a91525c 918 else
4a19ec58 919 sk->sk_mark = val;
4a19ec58 920 break;
877ce7c1 921
1da177e4
LT		 922 /* We implement the SO_SNDLOWAT etc to
923 not be settable (1003.1g 5.3) */
3b885787 924 case SO_RXQ_OVFL:
8083f0fc 925 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 926 break;
6e3e939f
JB		 927
928 case SO_WIFI_STATUS:
929 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
930 break;
931
ef64a54f
PE		 932 case SO_PEEK_OFF:
933 if (sock->ops->set_peek_off)
12663bfc 934 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 935 else
936 ret = -EOPNOTSUPP;
937 break;
3bdc0eba
BG		 938
939 case SO_NOFCS:
940 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
941 break;
942
7d4c04fc
KJ		 943 case SO_SELECT_ERR_QUEUE:
944 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
945 break;
946
e0d1095a 947#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 948 case SO_BUSY_POLL:
dafcc438
ET		 949 /* allow unprivileged users to decrease the value */
950 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
951 ret = -EPERM;
952 else {
953 if (val < 0)
954 ret = -EINVAL;
955 else
956 sk->sk_ll_usec = val;
957 }
958 break;
959#endif
62748f32
ED		 960
961 case SO_MAX_PACING_RATE:
962 sk->sk_max_pacing_rate = val;
963 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
964 sk->sk_max_pacing_rate);
965 break;
966
e71a4783
SH		 967 default:
968 ret = -ENOPROTOOPT;
969 break;
4ec93edb 970 }
1da177e4
LT		 971 release_sock(sk);
972 return ret;
973}
2a91525c 974EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 975
976
8f09898b 977static void cred_to_ucred(struct pid *pid, const struct cred *cred,
978 struct ucred *ucred)
3f551f94
EB		 979{
980 ucred->pid = pid_vnr(pid);
981 ucred->uid = ucred->gid = -1;
982 if (cred) {
983 struct user_namespace *current_ns = current_user_ns();
984
b2e4f544
EB		 985 ucred->uid = from_kuid_munged(current_ns, cred->euid);
986 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 987 }
988}
989
1da177e4
LT		 990int sock_getsockopt(struct socket *sock, int level, int optname,
991 char __user *optval, int __user *optlen)
992{
993 struct sock *sk = sock->sk;
4ec93edb 994
e71a4783 995 union {
4ec93edb
YH		 996 int val;
997 struct linger ling;
1da177e4
LT		 998 struct timeval tm;
999 } v;
4ec93edb 1000
4d0392be 1001 int lv = sizeof(int);
1da177e4 1002 int len;
4ec93edb 1003
e71a4783 1004 if (get_user(len, optlen))
4ec93edb 1005 return -EFAULT;
e71a4783 1006 if (len < 0)
1da177e4 1007 return -EINVAL;
4ec93edb 1008
50fee1de 1009 memset(&v, 0, sizeof(v));
df0bca04 1010
2a91525c 1011 switch (optname) {
e71a4783
SH		 1012 case SO_DEBUG:
1013 v.val = sock_flag(sk, SOCK_DBG);
1014 break;
1015
1016 case SO_DONTROUTE:
1017 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1018 break;
1019
1020 case SO_BROADCAST:
1b23a5df 1021 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1022 break;
1023
1024 case SO_SNDBUF:
1025 v.val = sk->sk_sndbuf;
1026 break;
1027
1028 case SO_RCVBUF:
1029 v.val = sk->sk_rcvbuf;
1030 break;
1031
1032 case SO_REUSEADDR:
1033 v.val = sk->sk_reuse;
1034 break;
1035
055dc21a
TH		 1036 case SO_REUSEPORT:
1037 v.val = sk->sk_reuseport;
1038 break;
1039
e71a4783 1040 case SO_KEEPALIVE:
1b23a5df 1041 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1042 break;
1043
1044 case SO_TYPE:
1045 v.val = sk->sk_type;
1046 break;
1047
49c794e9
JE		 1048 case SO_PROTOCOL:
1049 v.val = sk->sk_protocol;
1050 break;
1051
0d6038ee
JE		 1052 case SO_DOMAIN:
1053 v.val = sk->sk_family;
1054 break;
1055
e71a4783
SH		 1056 case SO_ERROR:
1057 v.val = -sock_error(sk);
2a91525c 1058 if (v.val == 0)
e71a4783
SH		 1059 v.val = xchg(&sk->sk_err_soft, 0);
1060 break;
1061
1062 case SO_OOBINLINE:
1b23a5df 1063 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1064 break;
1065
1066 case SO_NO_CHECK:
1067 v.val = sk->sk_no_check;
1068 break;
1069
1070 case SO_PRIORITY:
1071 v.val = sk->sk_priority;
1072 break;
1073
1074 case SO_LINGER:
1075 lv = sizeof(v.ling);
1b23a5df 1076 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1077 v.ling.l_linger = sk->sk_lingertime / HZ;
1078 break;
1079
1080 case SO_BSDCOMPAT:
1081 sock_warn_obsolete_bsdism("getsockopt");
1082 break;
1083
1084 case SO_TIMESTAMP:
92f37fd2
ED		 1085 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1086 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1087 break;
1088
1089 case SO_TIMESTAMPNS:
1090 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1091 break;
1092
20d49473
PO		 1093 case SO_TIMESTAMPING:
1094 v.val = 0;
1095 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
1096 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
1097 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
1098 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
1099 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
1100 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
1101 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1102 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
1103 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
1104 v.val |= SOF_TIMESTAMPING_SOFTWARE;
1105 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
1106 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
1107 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
1108 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
1109 break;
1110
e71a4783 1111 case SO_RCVTIMEO:
2a91525c 1112 lv = sizeof(struct timeval);
e71a4783
SH		 1113 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1114 v.tm.tv_sec = 0;
1115 v.tm.tv_usec = 0;
1116 } else {
1117 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1118 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1119 }
1120 break;
1121
1122 case SO_SNDTIMEO:
2a91525c 1123 lv = sizeof(struct timeval);
e71a4783
SH		 1124 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1125 v.tm.tv_sec = 0;
1126 v.tm.tv_usec = 0;
1127 } else {
1128 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1129 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1130 }
1131 break;
1da177e4 1132
e71a4783
SH		 1133 case SO_RCVLOWAT:
1134 v.val = sk->sk_rcvlowat;
1135 break;
1da177e4 1136
e71a4783 1137 case SO_SNDLOWAT:
2a91525c 1138 v.val = 1;
e71a4783 1139 break;
1da177e4 1140
e71a4783 1141 case SO_PASSCRED:
82981930 1142 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1143 break;
1da177e4 1144
e71a4783 1145 case SO_PEERCRED:
109f6e39
EB		 1146 {
1147 struct ucred peercred;
1148 if (len > sizeof(peercred))
1149 len = sizeof(peercred);
1150 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1151 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1152 return -EFAULT;
1153 goto lenout;
109f6e39 1154 }
1da177e4 1155
e71a4783
SH		 1156 case SO_PEERNAME:
1157 {
1158 char address[128];
1159
1160 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1161 return -ENOTCONN;
1162 if (lv < len)
1163 return -EINVAL;
1164 if (copy_to_user(optval, address, len))
1165 return -EFAULT;
1166 goto lenout;
1167 }
1da177e4 1168
e71a4783
SH		 1169 /* Dubious BSD thing... Probably nobody even uses it, but
1170 * the UNIX standard wants it for whatever reason... -DaveM
1171 */
1172 case SO_ACCEPTCONN:
1173 v.val = sk->sk_state == TCP_LISTEN;
1174 break;
1da177e4 1175
e71a4783 1176 case SO_PASSSEC:
82981930 1177 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1178 break;
877ce7c1 1179
e71a4783
SH		 1180 case SO_PEERSEC:
1181 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1182
4a19ec58
LAT		 1183 case SO_MARK:
1184 v.val = sk->sk_mark;
1185 break;
1186
3b885787 1187 case SO_RXQ_OVFL:
1b23a5df 1188 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1189 break;
1190
6e3e939f 1191 case SO_WIFI_STATUS:
1b23a5df 1192 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1193 break;
1194
ef64a54f
PE		 1195 case SO_PEEK_OFF:
1196 if (!sock->ops->set_peek_off)
1197 return -EOPNOTSUPP;
1198
1199 v.val = sk->sk_peek_off;
1200 break;
bc2f7996 1201 case SO_NOFCS:
1b23a5df 1202 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1203 break;
c91f6df2 1204
f7b86bfe 1205 case SO_BINDTODEVICE:
c91f6df2
BH		 1206 return sock_getbindtodevice(sk, optval, optlen, len);
1207
a8fc9277
PE		 1208 case SO_GET_FILTER:
1209 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1210 if (len < 0)
1211 return len;
1212
1213 goto lenout;
c91f6df2 1214
d59577b6
VB		 1215 case SO_LOCK_FILTER:
1216 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1217 break;
1218
ea02f941
MS		 1219 case SO_BPF_EXTENSIONS:
1220 v.val = bpf_tell_extensions();
1221 break;
1222
7d4c04fc
KJ		 1223 case SO_SELECT_ERR_QUEUE:
1224 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1225 break;
1226
e0d1095a 1227#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1228 case SO_BUSY_POLL:
dafcc438
ET		 1229 v.val = sk->sk_ll_usec;
1230 break;
1231#endif
1232
62748f32
ED		 1233 case SO_MAX_PACING_RATE:
1234 v.val = sk->sk_max_pacing_rate;
1235 break;
1236
e71a4783
SH		 1237 default:
1238 return -ENOPROTOOPT;
1da177e4 1239 }
e71a4783 1240
1da177e4
LT		 1241 if (len > lv)
1242 len = lv;
1243 if (copy_to_user(optval, &v, len))
1244 return -EFAULT;
1245lenout:
4ec93edb
YH		 1246 if (put_user(len, optlen))
1247 return -EFAULT;
1248 return 0;
1da177e4
LT		 1249}
1250
a5b5bb9a
IM		 1251/*
1252 * Initialize an sk_lock.
1253 *
1254 * (We also register the sk_lock with the lock validator.)
1255 */
b6f99a21 1256static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1257{
ed07536e
PZ		 1258 sock_lock_init_class_and_name(sk,
1259 af_family_slock_key_strings[sk->sk_family],
1260 af_family_slock_keys + sk->sk_family,
1261 af_family_key_strings[sk->sk_family],
1262 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1263}
1264
4dc6dc71
ED		 1265/*
1266 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1267 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1268 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1269 */
f1a6c4da
PE		 1270static void sock_copy(struct sock *nsk, const struct sock *osk)
1271{
1272#ifdef CONFIG_SECURITY_NETWORK
1273 void *sptr = nsk->sk_security;
1274#endif
68835aba
ED		 1275 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1276
1277 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1278 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1279
f1a6c4da
PE		 1280#ifdef CONFIG_SECURITY_NETWORK
1281 nsk->sk_security = sptr;
1282 security_sk_clone(osk, nsk);
1283#endif
1284}
1285
fcbdf09d
OP		 1286void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1287{
1288 unsigned long nulls1, nulls2;
1289
1290 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1291 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1292 if (nulls1 > nulls2)
1293 swap(nulls1, nulls2);
1294
1295 if (nulls1 != 0)
1296 memset((char *)sk, 0, nulls1);
1297 memset((char *)sk + nulls1 + sizeof(void *), 0,
1298 nulls2 - nulls1 - sizeof(void *));
1299 memset((char *)sk + nulls2 + sizeof(void *), 0,
1300 size - nulls2 - sizeof(void *));
1301}
1302EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1303
2e4afe7b
PE		 1304static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1305 int family)
c308c1b2
PE		 1306{
1307 struct sock *sk;
1308 struct kmem_cache *slab;
1309
1310 slab = prot->slab;
e912b114
ED		 1311 if (slab != NULL) {
1312 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1313 if (!sk)
1314 return sk;
1315 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1316 if (prot->clear_sk)
1317 prot->clear_sk(sk, prot->obj_size);
1318 else
1319 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1320 }
fcbdf09d 1321 } else
c308c1b2
PE		 1322 sk = kmalloc(prot->obj_size, priority);
1323
2e4afe7b 1324 if (sk != NULL) {
a98b65a3
VN		 1325 kmemcheck_annotate_bitfield(sk, flags);
1326
2e4afe7b
PE		 1327 if (security_sk_alloc(sk, family, priority))
1328 goto out_free;
1329
1330 if (!try_module_get(prot->owner))
1331 goto out_free_sec;
e022f0b4 1332 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1333 }
1334
c308c1b2 1335 return sk;
2e4afe7b
PE		 1336
1337out_free_sec:
1338 security_sk_free(sk);
1339out_free:
1340 if (slab != NULL)
1341 kmem_cache_free(slab, sk);
1342 else
1343 kfree(sk);
1344 return NULL;
c308c1b2
PE		 1345}
1346
1347static void sk_prot_free(struct proto *prot, struct sock *sk)
1348{
1349 struct kmem_cache *slab;
2e4afe7b 1350 struct module *owner;
c308c1b2 1351
2e4afe7b 1352 owner = prot->owner;
c308c1b2 1353 slab = prot->slab;
2e4afe7b
PE		 1354
1355 security_sk_free(sk);
c308c1b2
PE		 1356 if (slab != NULL)
1357 kmem_cache_free(slab, sk);
1358 else
1359 kfree(sk);
2e4afe7b 1360 module_put(owner);
c308c1b2
PE		 1361}
1362
86f8515f 1363#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
6ffd4641 1364void sock_update_netprioidx(struct sock *sk)
5bc1421e 1365{
5bc1421e
NH		 1366 if (in_interrupt())
1367 return;
2b73bc65 1368
6ffd4641 1369 sk->sk_cgrp_prioidx = task_netprioidx(current);
5bc1421e
NH		 1370}
1371EXPORT_SYMBOL_GPL(sock_update_netprioidx);
f8451725
HX		 1372#endif
1373
1da177e4
LT		 1374/**
1375 * sk_alloc - All socket objects are allocated here
c4ea43c5 1376 * @net: the applicable net namespace
4dc3b16b
PP		 1377 * @family: protocol family
1378 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1379 * @prot: struct proto associated with this new sock instance
1da177e4 1380 */
1b8d7ae4 1381struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1382 struct proto *prot)
1da177e4 1383{
c308c1b2 1384 struct sock *sk;
1da177e4 1385
154adbc8 1386 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1387 if (sk) {
154adbc8
PE		 1388 sk->sk_family = family;
1389 /*
1390 * See comment in struct sock definition to understand
1391 * why we need sk_prot_creator -acme
1392 */
1393 sk->sk_prot = sk->sk_prot_creator = prot;
1394 sock_lock_init(sk);
3b1e0a65 1395 sock_net_set(sk, get_net(net));
d66ee058 1396 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1397
211d2f97 1398 sock_update_classid(sk);
6ffd4641 1399 sock_update_netprioidx(sk);
1da177e4 1400 }
a79af59e 1401
2e4afe7b 1402 return sk;
1da177e4 1403}
2a91525c 1404EXPORT_SYMBOL(sk_alloc);
1da177e4 1405
2b85a34e 1406static void __sk_free(struct sock *sk)
1da177e4
LT		 1407{
1408 struct sk_filter *filter;
1da177e4
LT		 1409
1410 if (sk->sk_destruct)
1411 sk->sk_destruct(sk);
1412
a898def2
PM		 1413 filter = rcu_dereference_check(sk->sk_filter,
1414 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1415 if (filter) {
309dd5fc 1416 sk_filter_uncharge(sk, filter);
a9b3cd7f 1417 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1418 }
1419
08e29af3 1420 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1421
1422 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1423 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1424 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1425
109f6e39
EB		 1426 if (sk->sk_peer_cred)
1427 put_cred(sk->sk_peer_cred);
1428 put_pid(sk->sk_peer_pid);
3b1e0a65 1429 put_net(sock_net(sk));
c308c1b2 1430 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1431}
2b85a34e
ED		 1432
1433void sk_free(struct sock *sk)
1434{
1435 /*
25985edc 1436 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1437 * some packets are still in some tx queue.
1438 * If not null, sock_wfree() will call __sk_free(sk) later
1439 */
1440 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1441 __sk_free(sk);
1442}
2a91525c 1443EXPORT_SYMBOL(sk_free);
1da177e4 1444
edf02087 1445/*
25985edc
LDM		 1446 * Last sock_put should drop reference to sk->sk_net. It has already
1447 * been dropped in sk_change_net. Taking reference to stopping namespace
edf02087 1448 * is not an option.
25985edc 1449 * Take reference to a socket to remove it from hash _alive_ and after that
edf02087
DL		 1450 * destroy it in the context of init_net.
1451 */
1452void sk_release_kernel(struct sock *sk)
1453{
1454 if (sk == NULL || sk->sk_socket == NULL)
1455 return;
1456
1457 sock_hold(sk);
1458 sock_release(sk->sk_socket);
65a18ec5 1459 release_net(sock_net(sk));
3b1e0a65 1460 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1461 sock_put(sk);
1462}
45af1754 1463EXPORT_SYMBOL(sk_release_kernel);
edf02087 1464
475f1b52
SR		 1465static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1466{
1467 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1468 sock_update_memcg(newsk);
1469}
1470
e56c57d0
ED		 1471/**
1472 * sk_clone_lock - clone a socket, and lock its clone
1473 * @sk: the socket to clone
1474 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1475 *
1476 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1477 */
1478struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1479{
8fd1d178 1480 struct sock *newsk;
87d11ceb 1481
8fd1d178 1482 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1483 if (newsk != NULL) {
1484 struct sk_filter *filter;
1485
892c141e 1486 sock_copy(newsk, sk);
87d11ceb
ACM		 1487
1488 /* SANITY */
3b1e0a65 1489 get_net(sock_net(newsk));
87d11ceb
ACM		 1490 sk_node_init(&newsk->sk_node);
1491 sock_lock_init(newsk);
1492 bh_lock_sock(newsk);
fa438ccf 1493 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1494 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1495
1496 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1497 /*
1498 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1499 */
1500 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1501 atomic_set(&newsk->sk_omem_alloc, 0);
1502 skb_queue_head_init(&newsk->sk_receive_queue);
1503 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1504#ifdef CONFIG_NET_DMA
1505 skb_queue_head_init(&newsk->sk_async_wait_queue);
1506#endif
87d11ceb 1507
b6c6712a 1508 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1509 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1510 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1511 af_callback_keys + newsk->sk_family,
1512 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1513
1514 newsk->sk_dst_cache = NULL;
1515 newsk->sk_wmem_queued = 0;
1516 newsk->sk_forward_alloc = 0;
1517 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1518 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1519
1520 sock_reset_flag(newsk, SOCK_DONE);
1521 skb_queue_head_init(&newsk->sk_error_queue);
1522
0d7da9dd 1523 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb
ACM		 1524 if (filter != NULL)
1525 sk_filter_charge(newsk, filter);
1526
1527 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1528 /* It is still raw copy of parent, so invalidate
1529 * destructor and make plain sk_free() */
1530 newsk->sk_destruct = NULL;
b0691c8e 1531 bh_unlock_sock(newsk);
87d11ceb
ACM		 1532 sk_free(newsk);
1533 newsk = NULL;
1534 goto out;
1535 }
1536
1537 newsk->sk_err = 0;
1538 newsk->sk_priority = 0;
4dc6dc71
ED		 1539 /*
1540 * Before updating sk_refcnt, we must commit prior changes to memory
1541 * (Documentation/RCU/rculist_nulls.txt for details)
1542 */
1543 smp_wmb();
87d11ceb
ACM		 1544 atomic_set(&newsk->sk_refcnt, 2);
1545
1546 /*
1547 * Increment the counter in the same struct proto as the master
1548 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1549 * is the same as sk->sk_prot->socks, as this field was copied
1550 * with memcpy).
1551 *
1552 * This _changes_ the previous behaviour, where
1553 * tcp_create_openreq_child always was incrementing the
1554 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1555 * to be taken into account in all callers. -acme
1556 */
1557 sk_refcnt_debug_inc(newsk);
972692e0 1558 sk_set_socket(newsk, NULL);
43815482 1559 newsk->sk_wq = NULL;
87d11ceb 1560
f3f511e1
GC		 1561 sk_update_clone(sk, newsk);
1562
87d11ceb 1563 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1564 sk_sockets_allocated_inc(newsk);
704da560 1565
08e29af3 1566 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1567 net_enable_timestamp();
87d11ceb
ACM		 1568 }
1569out:
1570 return newsk;
1571}
e56c57d0 1572EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1573
9958089a
AK		 1574void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1575{
1576 __sk_dst_set(sk, dst);
1577 sk->sk_route_caps = dst->dev->features;
1578 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1579 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1580 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1581 if (sk_can_gso(sk)) {
82cc1a7a 1582 if (dst->header_len) {
9958089a 1583 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1584 } else {
9958089a 1585 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1586 sk->sk_gso_max_size = dst->dev->gso_max_size;
1485348d 1587 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
82cc1a7a 1588 }
9958089a
AK		 1589 }
1590}
1591EXPORT_SYMBOL_GPL(sk_setup_caps);
1592
1da177e4
LT		 1593/*
1594 * Simple resource managers for sockets.
1595 */
1596
1597
4ec93edb
YH		 1598/*
1599 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1600 */
1601void sock_wfree(struct sk_buff *skb)
1602{
1603 struct sock *sk = skb->sk;
d99927f4 1604 unsigned int len = skb->truesize;
1da177e4 1605
d99927f4
ED		 1606 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1607 /*
1608 * Keep a reference on sk_wmem_alloc, this will be released
1609 * after sk_write_space() call
1610 */
1611 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1612 sk->sk_write_space(sk);
d99927f4
ED		 1613 len = 1;
1614 }
2b85a34e 1615 /*
d99927f4
ED		 1616 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1617 * could not do because of in-flight packets
2b85a34e 1618 */
d99927f4 1619 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1620 __sk_free(sk);
1da177e4 1621}
2a91525c 1622EXPORT_SYMBOL(sock_wfree);
1da177e4 1623
f2f872f9
ED		 1624void skb_orphan_partial(struct sk_buff *skb)
1625{
1626 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1627 * so we do not completely orphan skb, but transfert all
1628 * accounted bytes but one, to avoid unexpected reorders.
1629 */
1630 if (skb->destructor == sock_wfree
1631#ifdef CONFIG_INET
1632 || skb->destructor == tcp_wfree
1633#endif
1634 ) {
1635 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1636 skb->truesize = 1;
1637 } else {
1638 skb_orphan(skb);
1639 }
1640}
1641EXPORT_SYMBOL(skb_orphan_partial);
1642
4ec93edb
YH		 1643/*
1644 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1645 */
1646void sock_rfree(struct sk_buff *skb)
1647{
1648 struct sock *sk = skb->sk;
d361fd59 1649 unsigned int len = skb->truesize;
1da177e4 1650
d361fd59
ED		 1651 atomic_sub(len, &sk->sk_rmem_alloc);
1652 sk_mem_uncharge(sk, len);
1da177e4 1653}
2a91525c 1654EXPORT_SYMBOL(sock_rfree);
1da177e4 1655
41063e9d
DM		 1656void sock_edemux(struct sk_buff *skb)
1657{
e812347c
ED		 1658 struct sock *sk = skb->sk;
1659
1c463e57 1660#ifdef CONFIG_INET
e812347c
ED		 1661 if (sk->sk_state == TCP_TIME_WAIT)
1662 inet_twsk_put(inet_twsk(sk));
1663 else
1c463e57 1664#endif
e812347c 1665 sock_put(sk);
41063e9d
DM		 1666}
1667EXPORT_SYMBOL(sock_edemux);
1da177e4 1668
976d0201 1669kuid_t sock_i_uid(struct sock *sk)
1da177e4 1670{
976d0201 1671 kuid_t uid;
1da177e4 1672
f064af1e 1673 read_lock_bh(&sk->sk_callback_lock);
976d0201 1674 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1675 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1676 return uid;
1677}
2a91525c 1678EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1679
1680unsigned long sock_i_ino(struct sock *sk)
1681{
1682 unsigned long ino;
1683
f064af1e 1684 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1685 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1686 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1687 return ino;
1688}
2a91525c 1689EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1690
1691/*
1692 * Allocate a skb from the socket's send buffer.
1693 */
86a76caf 1694struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1695 gfp_t priority)
1da177e4
LT		 1696{
1697 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1698 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1699 if (skb) {
1700 skb_set_owner_w(skb, sk);
1701 return skb;
1702 }
1703 }
1704 return NULL;
1705}
2a91525c 1706EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1707
4ec93edb 1708/*
1da177e4 1709 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1710 */
dd0fc66f 1711void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1712{
95c96174 1713 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1714 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1715 void *mem;
1716 /* First do the add, to avoid the race if kmalloc
4ec93edb 1717 * might sleep.
1da177e4
LT		 1718 */
1719 atomic_add(size, &sk->sk_omem_alloc);
1720 mem = kmalloc(size, priority);
1721 if (mem)
1722 return mem;
1723 atomic_sub(size, &sk->sk_omem_alloc);
1724 }
1725 return NULL;
1726}
2a91525c 1727EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1728
1729/*
1730 * Free an option memory block.
1731 */
1732void sock_kfree_s(struct sock *sk, void *mem, int size)
1733{
1734 kfree(mem);
1735 atomic_sub(size, &sk->sk_omem_alloc);
1736}
2a91525c 1737EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1738
1739/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1740 I think, these locks should be removed for datagram sockets.
1741 */
2a91525c 1742static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1743{
1744 DEFINE_WAIT(wait);
1745
1746 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1747 for (;;) {
1748 if (!timeo)
1749 break;
1750 if (signal_pending(current))
1751 break;
1752 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1753 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1754 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1755 break;
1756 if (sk->sk_shutdown & SEND_SHUTDOWN)
1757 break;
1758 if (sk->sk_err)
1759 break;
1760 timeo = schedule_timeout(timeo);
1761 }
aa395145 1762 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1763 return timeo;
1764}
1765
1766
1767/*
1768 * Generic send/receive buffer handlers
1769 */
1770
4cc7f68d
HX		 1771struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1772 unsigned long data_len, int noblock,
28d64271 1773 int *errcode, int max_page_order)
1da177e4 1774{
28d64271
ED		 1775 struct sk_buff *skb = NULL;
1776 unsigned long chunk;
7d877f3b 1777 gfp_t gfp_mask;
1da177e4
LT		 1778 long timeo;
1779 int err;
cc9b17ad 1780 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
28d64271
ED		 1781 struct page *page;
1782 int i;
cc9b17ad
JW		 1783
1784 err = -EMSGSIZE;
1785 if (npages > MAX_SKB_FRAGS)
1786 goto failure;
1da177e4 1787
1da177e4 1788 timeo = sock_sndtimeo(sk, noblock);
28d64271 1789 while (!skb) {
1da177e4
LT		 1790 err = sock_error(sk);
1791 if (err != 0)
1792 goto failure;
1793
1794 err = -EPIPE;
1795 if (sk->sk_shutdown & SEND_SHUTDOWN)
1796 goto failure;
1797
28d64271
ED		 1798 if (atomic_read(&sk->sk_wmem_alloc) >= sk->sk_sndbuf) {
1799 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1800 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1801 err = -EAGAIN;
1802 if (!timeo)
1803 goto failure;
1804 if (signal_pending(current))
1805 goto interrupted;
1806 timeo = sock_wait_for_wmem(sk, timeo);
1807 continue;
1808 }
1da177e4 1809
28d64271
ED		 1810 err = -ENOBUFS;
1811 gfp_mask = sk->sk_allocation;
1812 if (gfp_mask & __GFP_WAIT)
1813 gfp_mask |= __GFP_REPEAT;
1814
1815 skb = alloc_skb(header_len, gfp_mask);
1816 if (!skb)
1da177e4 1817 goto failure;
28d64271
ED		 1818
1819 skb->truesize += data_len;
1820
1821 for (i = 0; npages > 0; i++) {
1822 int order = max_page_order;
1823
1824 while (order) {
1825 if (npages >= 1 << order) {
1826 page = alloc_pages(sk->sk_allocation |
ed98df33
ED		 1827 __GFP_COMP |
1828 __GFP_NOWARN |
1829 __GFP_NORETRY,
28d64271
ED		 1830 order);
1831 if (page)
1832 goto fill_page;
1833 }
1834 order--;
1835 }
1836 page = alloc_page(sk->sk_allocation);
1837 if (!page)
1838 goto failure;
1839fill_page:
1840 chunk = min_t(unsigned long, data_len,
1841 PAGE_SIZE << order);
1842 skb_fill_page_desc(skb, i, page, 0, chunk);
1843 data_len -= chunk;
1844 npages -= 1 << order;
1da177e4 1845 }
1da177e4
LT		 1846 }
1847
1848 skb_set_owner_w(skb, sk);
1849 return skb;
1850
1851interrupted:
1852 err = sock_intr_errno(timeo);
1853failure:
28d64271 1854 kfree_skb(skb);
1da177e4
LT		 1855 *errcode = err;
1856 return NULL;
1857}
4cc7f68d 1858EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1859
4ec93edb 1860struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1861 int noblock, int *errcode)
1862{
28d64271 1863 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1864}
2a91525c 1865EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1866
5640f768
ED		 1867/* On 32bit arches, an skb frag is limited to 2^15 */
1868#define SKB_FRAG_PAGE_ORDER get_order(32768)
1869
400dfd3a
ED		 1870/**
1871 * skb_page_frag_refill - check that a page_frag contains enough room
1872 * @sz: minimum size of the fragment we want to get
1873 * @pfrag: pointer to page_frag
1874 * @prio: priority for memory allocation
1875 *
1876 * Note: While this allocator tries to use high order pages, there is
1877 * no guarantee that allocations succeed. Therefore, @sz MUST be
1878 * less or equal than PAGE_SIZE.
1879 */
1880bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t prio)
5640f768
ED		 1881{
1882 int order;
1883
1884 if (pfrag->page) {
1885 if (atomic_read(&pfrag->page->_count) == 1) {
1886 pfrag->offset = 0;
1887 return true;
1888 }
400dfd3a 1889 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1890 return true;
1891 put_page(pfrag->page);
1892 }
1893
097b4f19 1894 order = SKB_FRAG_PAGE_ORDER;
5640f768 1895 do {
400dfd3a 1896 gfp_t gfp = prio;
5640f768
ED		 1897
1898 if (order)
ed98df33 1899 gfp |= __GFP_COMP | __GFP_NOWARN | __GFP_NORETRY;
5640f768
ED		 1900 pfrag->page = alloc_pages(gfp, order);
1901 if (likely(pfrag->page)) {
1902 pfrag->offset = 0;
1903 pfrag->size = PAGE_SIZE << order;
1904 return true;
1905 }
1906 } while (--order >= 0);
1907
400dfd3a
ED		 1908 return false;
1909}
1910EXPORT_SYMBOL(skb_page_frag_refill);
1911
1912bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1913{
1914 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1915 return true;
1916
5640f768
ED		 1917 sk_enter_memory_pressure(sk);
1918 sk_stream_moderate_sndbuf(sk);
1919 return false;
1920}
1921EXPORT_SYMBOL(sk_page_frag_refill);
1922
1da177e4 1923static void __lock_sock(struct sock *sk)
f39234d6
NK		 1924 __releases(&sk->sk_lock.slock)
1925 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1926{
1927 DEFINE_WAIT(wait);
1928
e71a4783 1929 for (;;) {
1da177e4
LT		 1930 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1931 TASK_UNINTERRUPTIBLE);
1932 spin_unlock_bh(&sk->sk_lock.slock);
1933 schedule();
1934 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1935 if (!sock_owned_by_user(sk))
1da177e4
LT		 1936 break;
1937 }
1938 finish_wait(&sk->sk_lock.wq, &wait);
1939}
1940
1941static void __release_sock(struct sock *sk)
f39234d6
NK		 1942 __releases(&sk->sk_lock.slock)
1943 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1944{
1945 struct sk_buff *skb = sk->sk_backlog.head;
1946
1947 do {
1948 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1949 bh_unlock_sock(sk);
1950
1951 do {
1952 struct sk_buff *next = skb->next;
1953
e4cbb02a 1954 prefetch(next);
7fee226a 1955 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1956 skb->next = NULL;
c57943a1 1957 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1958
1959 /*
1960 * We are in process context here with softirqs
1961 * disabled, use cond_resched_softirq() to preempt.
1962 * This is safe to do because we've taken the backlog
1963 * queue private:
1964 */
1965 cond_resched_softirq();
1966
1967 skb = next;
1968 } while (skb != NULL);
1969
1970 bh_lock_sock(sk);
e71a4783 1971 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1972
1973 /*
1974 * Doing the zeroing here guarantee we can not loop forever
1975 * while a wild producer attempts to flood us.
1976 */
1977 sk->sk_backlog.len = 0;
1da177e4
LT		 1978}
1979
1980/**
1981 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1982 * @sk: sock to wait on
1983 * @timeo: for how long
1da177e4
LT		 1984 *
1985 * Now socket state including sk->sk_err is changed only under lock,
1986 * hence we may omit checks after joining wait queue.
1987 * We check receive queue before schedule() only as optimization;
1988 * it is very likely that release_sock() added new data.
1989 */
1990int sk_wait_data(struct sock *sk, long *timeo)
1991{
1992 int rc;
1993 DEFINE_WAIT(wait);
1994
aa395145 1995 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1996 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1997 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1998 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1999 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 2000 return rc;
2001}
1da177e4
LT		 2002EXPORT_SYMBOL(sk_wait_data);
2003
3ab224be
HA		 2004/**
2005 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2006 * @sk: socket
2007 * @size: memory size to allocate
2008 * @kind: allocation type
2009 *
2010 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2011 * rmem allocation. This function assumes that protocols which have
2012 * memory_pressure use sk_wmem_queued as write buffer accounting.
2013 */
2014int __sk_mem_schedule(struct sock *sk, int size, int kind)
2015{
2016 struct proto *prot = sk->sk_prot;
2017 int amt = sk_mem_pages(size);
8d987e5c 2018 long allocated;
e1aab161 2019 int parent_status = UNDER_LIMIT;
3ab224be
HA		 2020
2021 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 2022
e1aab161 2023 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 2024
2025 /* Under limit. */
e1aab161
GC		 2026 if (parent_status == UNDER_LIMIT &&
2027 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2028 sk_leave_memory_pressure(sk);
3ab224be
HA		 2029 return 1;
2030 }
2031
e1aab161
GC		 2032 /* Under pressure. (we or our parents) */
2033 if ((parent_status > SOFT_LIMIT) ||
2034 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2035 sk_enter_memory_pressure(sk);
3ab224be 2036
e1aab161
GC		 2037 /* Over hard limit (we or our parents) */
2038 if ((parent_status == OVER_LIMIT) ||
2039 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 2040 goto suppress_allocation;
2041
2042 /* guarantee minimum buffer size under pressure */
2043 if (kind == SK_MEM_RECV) {
2044 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2045 return 1;
180d8cd9 2046
3ab224be
HA		 2047 } else { /* SK_MEM_SEND */
2048 if (sk->sk_type == SOCK_STREAM) {
2049 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2050 return 1;
2051 } else if (atomic_read(&sk->sk_wmem_alloc) <
2052 prot->sysctl_wmem[0])
2053 return 1;
2054 }
2055
180d8cd9 2056 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2057 int alloc;
2058
180d8cd9 2059 if (!sk_under_memory_pressure(sk))
1748376b 2060 return 1;
180d8cd9
GC		 2061 alloc = sk_sockets_allocated_read_positive(sk);
2062 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2063 sk_mem_pages(sk->sk_wmem_queued +
2064 atomic_read(&sk->sk_rmem_alloc) +
2065 sk->sk_forward_alloc))
2066 return 1;
2067 }
2068
2069suppress_allocation:
2070
2071 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2072 sk_stream_moderate_sndbuf(sk);
2073
2074 /* Fail only if socket is _under_ its sndbuf.
2075 * In this case we cannot block, so that we have to fail.
2076 */
2077 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2078 return 1;
2079 }
2080
3847ce32
SM		 2081 trace_sock_exceed_buf_limit(sk, prot, allocated);
2082
3ab224be
HA		 2083 /* Alas. Undo changes. */
2084 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2085
0e90b31f 2086 sk_memory_allocated_sub(sk, amt);
180d8cd9 2087
3ab224be
HA		 2088 return 0;
2089}
3ab224be
HA		 2090EXPORT_SYMBOL(__sk_mem_schedule);
2091
2092/**
2093 * __sk_reclaim - reclaim memory_allocated
2094 * @sk: socket
2095 */
2096void __sk_mem_reclaim(struct sock *sk)
2097{
180d8cd9 2098 sk_memory_allocated_sub(sk,
0e90b31f 2099 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
3ab224be
HA		 2100 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
2101
180d8cd9
GC		 2102 if (sk_under_memory_pressure(sk) &&
2103 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2104 sk_leave_memory_pressure(sk);
3ab224be 2105}
3ab224be
HA		 2106EXPORT_SYMBOL(__sk_mem_reclaim);
2107
2108
1da177e4
LT		 2109/*
2110 * Set of default routines for initialising struct proto_ops when
2111 * the protocol does not support a particular function. In certain
2112 * cases where it makes no sense for a protocol to have a "do nothing"
2113 * function, some default processing is provided.
2114 */
2115
2116int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2117{
2118 return -EOPNOTSUPP;
2119}
2a91525c 2120EXPORT_SYMBOL(sock_no_bind);
1da177e4 2121
4ec93edb 2122int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2123 int len, int flags)
2124{
2125 return -EOPNOTSUPP;
2126}
2a91525c 2127EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2128
2129int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2130{
2131 return -EOPNOTSUPP;
2132}
2a91525c 2133EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2134
2135int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2136{
2137 return -EOPNOTSUPP;
2138}
2a91525c 2139EXPORT_SYMBOL(sock_no_accept);
1da177e4 2140
4ec93edb 2141int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2142 int *len, int peer)
2143{
2144 return -EOPNOTSUPP;
2145}
2a91525c 2146EXPORT_SYMBOL(sock_no_getname);
1da177e4 2147
2a91525c 2148unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2149{
2150 return 0;
2151}
2a91525c 2152EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2153
2154int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2155{
2156 return -EOPNOTSUPP;
2157}
2a91525c 2158EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2159
2160int sock_no_listen(struct socket *sock, int backlog)
2161{
2162 return -EOPNOTSUPP;
2163}
2a91525c 2164EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2165
2166int sock_no_shutdown(struct socket *sock, int how)
2167{
2168 return -EOPNOTSUPP;
2169}
2a91525c 2170EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2171
2172int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2173 char __user *optval, unsigned int optlen)
1da177e4
LT		 2174{
2175 return -EOPNOTSUPP;
2176}
2a91525c 2177EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2178
2179int sock_no_getsockopt(struct socket *sock, int level, int optname,
2180 char __user *optval, int __user *optlen)
2181{
2182 return -EOPNOTSUPP;
2183}
2a91525c 2184EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 2185
2186int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2187 size_t len)
2188{
2189 return -EOPNOTSUPP;
2190}
2a91525c 2191EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 2192
2193int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2194 size_t len, int flags)
2195{
2196 return -EOPNOTSUPP;
2197}
2a91525c 2198EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2199
2200int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2201{
2202 /* Mirror missing mmap method error code */
2203 return -ENODEV;
2204}
2a91525c 2205EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2206
2207ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2208{
2209 ssize_t res;
2210 struct msghdr msg = {.msg_flags = flags};
2211 struct kvec iov;
2212 char *kaddr = kmap(page);
2213 iov.iov_base = kaddr + offset;
2214 iov.iov_len = size;
2215 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2216 kunmap(page);
2217 return res;
2218}
2a91525c 2219EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2220
2221/*
2222 * Default Socket Callbacks
2223 */
2224
2225static void sock_def_wakeup(struct sock *sk)
2226{
43815482
ED		 2227 struct socket_wq *wq;
2228
2229 rcu_read_lock();
2230 wq = rcu_dereference(sk->sk_wq);
2231 if (wq_has_sleeper(wq))
2232 wake_up_interruptible_all(&wq->wait);
2233 rcu_read_unlock();
1da177e4
LT		 2234}
2235
2236static void sock_def_error_report(struct sock *sk)
2237{
43815482
ED		 2238 struct socket_wq *wq;
2239
2240 rcu_read_lock();
2241 wq = rcu_dereference(sk->sk_wq);
2242 if (wq_has_sleeper(wq))
2243 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2244 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2245 rcu_read_unlock();
1da177e4
LT		 2246}
2247
676d2369 2248static void sock_def_readable(struct sock *sk)
1da177e4 2249{
43815482
ED		 2250 struct socket_wq *wq;
2251
2252 rcu_read_lock();
2253 wq = rcu_dereference(sk->sk_wq);
2254 if (wq_has_sleeper(wq))
2c6607c6 2255 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2256 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2257 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2258 rcu_read_unlock();
1da177e4
LT		 2259}
2260
2261static void sock_def_write_space(struct sock *sk)
2262{
43815482
ED		 2263 struct socket_wq *wq;
2264
2265 rcu_read_lock();
1da177e4
LT		 2266
2267 /* Do not wake up a writer until he can make "significant"
2268 * progress. --DaveM
2269 */
e71a4783 2270 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2271 wq = rcu_dereference(sk->sk_wq);
2272 if (wq_has_sleeper(wq))
2273 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2274 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2275
2276 /* Should agree with poll, otherwise some programs break */
2277 if (sock_writeable(sk))
8d8ad9d7 2278 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2279 }
2280
43815482 2281 rcu_read_unlock();
1da177e4
LT		 2282}
2283
2284static void sock_def_destruct(struct sock *sk)
2285{
a51482bd 2286 kfree(sk->sk_protinfo);
1da177e4
LT		 2287}
2288
2289void sk_send_sigurg(struct sock *sk)
2290{
2291 if (sk->sk_socket && sk->sk_socket->file)
2292 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2293 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2294}
2a91525c 2295EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2296
2297void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2298 unsigned long expires)
2299{
2300 if (!mod_timer(timer, expires))
2301 sock_hold(sk);
2302}
1da177e4
LT		 2303EXPORT_SYMBOL(sk_reset_timer);
2304
2305void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2306{
25cc4ae9 2307 if (del_timer(timer))
1da177e4
LT		 2308 __sock_put(sk);
2309}
1da177e4
LT		 2310EXPORT_SYMBOL(sk_stop_timer);
2311
2312void sock_init_data(struct socket *sock, struct sock *sk)
2313{
2314 skb_queue_head_init(&sk->sk_receive_queue);
2315 skb_queue_head_init(&sk->sk_write_queue);
2316 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 2317#ifdef CONFIG_NET_DMA
2318 skb_queue_head_init(&sk->sk_async_wait_queue);
2319#endif
1da177e4
LT		 2320
2321 sk->sk_send_head = NULL;
2322
2323 init_timer(&sk->sk_timer);
4ec93edb 2324
1da177e4
LT		 2325 sk->sk_allocation = GFP_KERNEL;
2326 sk->sk_rcvbuf = sysctl_rmem_default;
2327 sk->sk_sndbuf = sysctl_wmem_default;
2328 sk->sk_state = TCP_CLOSE;
972692e0 2329 sk_set_socket(sk, sock);
1da177e4
LT		 2330
2331 sock_set_flag(sk, SOCK_ZAPPED);
2332
e71a4783 2333 if (sock) {
1da177e4 2334 sk->sk_type = sock->type;
43815482 2335 sk->sk_wq = sock->wq;
1da177e4
LT		 2336 sock->sk = sk;
2337 } else
43815482 2338 sk->sk_wq = NULL;
1da177e4 2339
b6c6712a 2340 spin_lock_init(&sk->sk_dst_lock);
1da177e4 2341 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2342 lockdep_set_class_and_name(&sk->sk_callback_lock,
2343 af_callback_keys + sk->sk_family,
2344 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2345
2346 sk->sk_state_change = sock_def_wakeup;
2347 sk->sk_data_ready = sock_def_readable;
2348 sk->sk_write_space = sock_def_write_space;
2349 sk->sk_error_report = sock_def_error_report;
2350 sk->sk_destruct = sock_def_destruct;
2351
5640f768
ED		 2352 sk->sk_frag.page = NULL;
2353 sk->sk_frag.offset = 0;
ef64a54f 2354 sk->sk_peek_off = -1;
1da177e4 2355
109f6e39
EB		 2356 sk->sk_peer_pid = NULL;
2357 sk->sk_peer_cred = NULL;
1da177e4
LT		 2358 sk->sk_write_pending = 0;
2359 sk->sk_rcvlowat = 1;
2360 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2361 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2362
f37f0afb 2363 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2364
e0d1095a 2365#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2366 sk->sk_napi_id = 0;
64b0dc51 2367 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2368#endif
2369
62748f32 2370 sk->sk_max_pacing_rate = ~0U;
7eec4174 2371 sk->sk_pacing_rate = ~0U;
4dc6dc71
ED		 2372 /*
2373 * Before updating sk_refcnt, we must commit prior changes to memory
2374 * (Documentation/RCU/rculist_nulls.txt for details)
2375 */
2376 smp_wmb();
1da177e4 2377 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2378 atomic_set(&sk->sk_drops, 0);
1da177e4 2379}
2a91525c 2380EXPORT_SYMBOL(sock_init_data);
1da177e4 2381
b5606c2d 2382void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2383{
2384 might_sleep();
a5b5bb9a 2385 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2386 if (sk->sk_lock.owned)
1da177e4 2387 __lock_sock(sk);
d2e9117c 2388 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2389 spin_unlock(&sk->sk_lock.slock);
2390 /*
2391 * The sk_lock has mutex_lock() semantics here:
2392 */
fcc70d5f 2393 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2394 local_bh_enable();
1da177e4 2395}
fcc70d5f 2396EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2397
b5606c2d 2398void release_sock(struct sock *sk)
1da177e4 2399{
a5b5bb9a
IM		 2400 /*
2401 * The sk_lock has mutex_unlock() semantics:
2402 */
2403 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2404
2405 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2406 if (sk->sk_backlog.tail)
2407 __release_sock(sk);
46d3ceab 2408
c3f9b018
ED		 2409 /* Warning : release_cb() might need to release sk ownership,
2410 * ie call sock_release_ownership(sk) before us.
2411 */
46d3ceab
ED		 2412 if (sk->sk_prot->release_cb)
2413 sk->sk_prot->release_cb(sk);
2414
c3f9b018 2415 sock_release_ownership(sk);
a5b5bb9a
IM		 2416 if (waitqueue_active(&sk->sk_lock.wq))
2417 wake_up(&sk->sk_lock.wq);
2418 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2419}
2420EXPORT_SYMBOL(release_sock);
2421
8a74ad60
ED		 2422/**
2423 * lock_sock_fast - fast version of lock_sock
2424 * @sk: socket
2425 *
2426 * This version should be used for very small section, where process wont block
2427 * return false if fast path is taken
2428 * sk_lock.slock locked, owned = 0, BH disabled
2429 * return true if slow path is taken
2430 * sk_lock.slock unlocked, owned = 1, BH enabled
2431 */
2432bool lock_sock_fast(struct sock *sk)
2433{
2434 might_sleep();
2435 spin_lock_bh(&sk->sk_lock.slock);
2436
2437 if (!sk->sk_lock.owned)
2438 /*
2439 * Note : We must disable BH
2440 */
2441 return false;
2442
2443 __lock_sock(sk);
2444 sk->sk_lock.owned = 1;
2445 spin_unlock(&sk->sk_lock.slock);
2446 /*
2447 * The sk_lock has mutex_lock() semantics here:
2448 */
2449 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2450 local_bh_enable();
2451 return true;
2452}
2453EXPORT_SYMBOL(lock_sock_fast);
2454
1da177e4 2455int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2456{
b7aa0bf7 2457 struct timeval tv;
1da177e4 2458 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2459 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2460 tv = ktime_to_timeval(sk->sk_stamp);
2461 if (tv.tv_sec == -1)
1da177e4 2462 return -ENOENT;
b7aa0bf7
ED		 2463 if (tv.tv_sec == 0) {
2464 sk->sk_stamp = ktime_get_real();
2465 tv = ktime_to_timeval(sk->sk_stamp);
2466 }
2467 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2468}
1da177e4
LT		 2469EXPORT_SYMBOL(sock_get_timestamp);
2470
ae40eb1e
ED		 2471int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2472{
2473 struct timespec ts;
2474 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2475 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2476 ts = ktime_to_timespec(sk->sk_stamp);
2477 if (ts.tv_sec == -1)
2478 return -ENOENT;
2479 if (ts.tv_sec == 0) {
2480 sk->sk_stamp = ktime_get_real();
2481 ts = ktime_to_timespec(sk->sk_stamp);
2482 }
2483 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2484}
2485EXPORT_SYMBOL(sock_get_timestampns);
2486
20d49473 2487void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2488{
20d49473 2489 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2490 unsigned long previous_flags = sk->sk_flags;
2491
20d49473
PO		 2492 sock_set_flag(sk, flag);
2493 /*
2494 * we just set one of the two flags which require net
2495 * time stamping, but time stamping might have been on
2496 * already because of the other one
2497 */
08e29af3 2498 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2499 net_enable_timestamp();
1da177e4
LT		 2500 }
2501}
1da177e4 2502
cb820f8e
RC		 2503int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2504 int level, int type)
2505{
2506 struct sock_exterr_skb *serr;
2507 struct sk_buff *skb, *skb2;
2508 int copied, err;
2509
2510 err = -EAGAIN;
2511 skb = skb_dequeue(&sk->sk_error_queue);
2512 if (skb == NULL)
2513 goto out;
2514
2515 copied = skb->len;
2516 if (copied > len) {
2517 msg->msg_flags |= MSG_TRUNC;
2518 copied = len;
2519 }
2520 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2521 if (err)
2522 goto out_free_skb;
2523
2524 sock_recv_timestamp(msg, sk, skb);
2525
2526 serr = SKB_EXT_ERR(skb);
2527 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2528
2529 msg->msg_flags |= MSG_ERRQUEUE;
2530 err = copied;
2531
2532 /* Reset and regenerate socket error */
2533 spin_lock_bh(&sk->sk_error_queue.lock);
2534 sk->sk_err = 0;
2535 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
2536 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
2537 spin_unlock_bh(&sk->sk_error_queue.lock);
2538 sk->sk_error_report(sk);
2539 } else
2540 spin_unlock_bh(&sk->sk_error_queue.lock);
2541
2542out_free_skb:
2543 kfree_skb(skb);
2544out:
2545 return err;
2546}
2547EXPORT_SYMBOL(sock_recv_errqueue);
2548
1da177e4
LT		 2549/*
2550 * Get a socket option on an socket.
2551 *
2552 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2553 * asynchronous errors should be reported by getsockopt. We assume
2554 * this means if you specify SO_ERROR (otherwise whats the point of it).
2555 */
2556int sock_common_getsockopt(struct socket *sock, int level, int optname,
2557 char __user *optval, int __user *optlen)
2558{
2559 struct sock *sk = sock->sk;
2560
2561 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2562}
1da177e4
LT		 2563EXPORT_SYMBOL(sock_common_getsockopt);
2564
3fdadf7d 2565#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2566int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2567 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2568{
2569 struct sock *sk = sock->sk;
2570
1e51f951 2571 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2572 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2573 optval, optlen);
3fdadf7d
DM		 2574 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2575}
2576EXPORT_SYMBOL(compat_sock_common_getsockopt);
2577#endif
2578
1da177e4
LT		 2579int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2580 struct msghdr *msg, size_t size, int flags)
2581{
2582 struct sock *sk = sock->sk;
2583 int addr_len = 0;
2584 int err;
2585
2586 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2587 flags & ~MSG_DONTWAIT, &addr_len);
2588 if (err >= 0)
2589 msg->msg_namelen = addr_len;
2590 return err;
2591}
1da177e4
LT		 2592EXPORT_SYMBOL(sock_common_recvmsg);
2593
2594/*
2595 * Set socket options on an inet socket.
2596 */
2597int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2598 char __user *optval, unsigned int optlen)
1da177e4
LT		 2599{
2600 struct sock *sk = sock->sk;
2601
2602 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2603}
1da177e4
LT		 2604EXPORT_SYMBOL(sock_common_setsockopt);
2605
3fdadf7d 2606#ifdef CONFIG_COMPAT
543d9cfe 2607int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2608 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2609{
2610 struct sock *sk = sock->sk;
2611
543d9cfe
ACM		 2612 if (sk->sk_prot->compat_setsockopt != NULL)
2613 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2614 optval, optlen);
3fdadf7d
DM		 2615 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2616}
2617EXPORT_SYMBOL(compat_sock_common_setsockopt);
2618#endif
2619
1da177e4
LT		 2620void sk_common_release(struct sock *sk)
2621{
2622 if (sk->sk_prot->destroy)
2623 sk->sk_prot->destroy(sk);
2624
2625 /*
2626 * Observation: when sock_common_release is called, processes have
2627 * no access to socket. But net still has.
2628 * Step one, detach it from networking:
2629 *
2630 * A. Remove from hash tables.
2631 */
2632
2633 sk->sk_prot->unhash(sk);
2634
2635 /*
2636 * In this point socket cannot receive new packets, but it is possible
2637 * that some packets are in flight because some CPU runs receiver and
2638 * did hash table lookup before we unhashed socket. They will achieve
2639 * receive queue and will be purged by socket destructor.
2640 *
2641 * Also we still have packets pending on receive queue and probably,
2642 * our own packets waiting in device queues. sock_destroy will drain
2643 * receive queue, but transmitted packets will delay socket destruction
2644 * until the last reference will be released.
2645 */
2646
2647 sock_orphan(sk);
2648
2649 xfrm_sk_free_policy(sk);
2650
e6848976 2651 sk_refcnt_debug_release(sk);
5640f768
ED		 2652
2653 if (sk->sk_frag.page) {
2654 put_page(sk->sk_frag.page);
2655 sk->sk_frag.page = NULL;
2656 }
2657
1da177e4
LT		 2658 sock_put(sk);
2659}
1da177e4
LT		 2660EXPORT_SYMBOL(sk_common_release);
2661
13ff3d6f
PE		 2662#ifdef CONFIG_PROC_FS
2663#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2664struct prot_inuse {
2665 int val[PROTO_INUSE_NR];
2666};
13ff3d6f
PE		 2667
2668static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2669
2670#ifdef CONFIG_NET_NS
2671void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2672{
d6d9ca0f 2673 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2674}
2675EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2676
2677int sock_prot_inuse_get(struct net *net, struct proto *prot)
2678{
2679 int cpu, idx = prot->inuse_idx;
2680 int res = 0;
2681
2682 for_each_possible_cpu(cpu)
2683 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2684
2685 return res >= 0 ? res : 0;
2686}
2687EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2688
2c8c1e72 2689static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2690{
2691 net->core.inuse = alloc_percpu(struct prot_inuse);
2692 return net->core.inuse ? 0 : -ENOMEM;
2693}
2694
2c8c1e72 2695static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2696{
2697 free_percpu(net->core.inuse);
2698}
2699
2700static struct pernet_operations net_inuse_ops = {
2701 .init = sock_inuse_init_net,
2702 .exit = sock_inuse_exit_net,
2703};
2704
2705static __init int net_inuse_init(void)
2706{
2707 if (register_pernet_subsys(&net_inuse_ops))
2708 panic("Cannot initialize net inuse counters");
2709
2710 return 0;
2711}
2712
2713core_initcall(net_inuse_init);
2714#else
1338d466
PE		 2715static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2716
c29a0bc4 2717void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2718{
d6d9ca0f 2719 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2720}
2721EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2722
c29a0bc4 2723int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2724{
2725 int cpu, idx = prot->inuse_idx;
2726 int res = 0;
2727
2728 for_each_possible_cpu(cpu)
2729 res += per_cpu(prot_inuse, cpu).val[idx];
2730
2731 return res >= 0 ? res : 0;
2732}
2733EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2734#endif
13ff3d6f
PE		 2735
2736static void assign_proto_idx(struct proto *prot)
2737{
2738 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2739
2740 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2741 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2742 return;
2743 }
2744
2745 set_bit(prot->inuse_idx, proto_inuse_idx);
2746}
2747
2748static void release_proto_idx(struct proto *prot)
2749{
2750 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2751 clear_bit(prot->inuse_idx, proto_inuse_idx);
2752}
2753#else
2754static inline void assign_proto_idx(struct proto *prot)
2755{
2756}
2757
2758static inline void release_proto_idx(struct proto *prot)
2759{
2760}
2761#endif
2762
b733c007
PE		 2763int proto_register(struct proto *prot, int alloc_slab)
2764{
1da177e4
LT		 2765 if (alloc_slab) {
2766 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2767 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2768 NULL);
1da177e4
LT		 2769
2770 if (prot->slab == NULL) {
e005d193
JP		 2771 pr_crit("%s: Can't create sock SLAB cache!\n",
2772 prot->name);
60e7663d 2773 goto out;
1da177e4 2774 }
2e6599cb
ACM		 2775
2776 if (prot->rsk_prot != NULL) {
faf23422 2777 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2778 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2779 goto out_free_sock_slab;
2780
7e56b5d6 2781 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2782 prot->rsk_prot->obj_size, 0,
20c2df83 2783 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2784
2785 if (prot->rsk_prot->slab == NULL) {
e005d193
JP		 2786 pr_crit("%s: Can't create request sock SLAB cache!\n",
2787 prot->name);
2e6599cb
ACM		 2788 goto out_free_request_sock_slab_name;
2789 }
2790 }
8feaf0c0 2791
6d6ee43e 2792 if (prot->twsk_prot != NULL) {
faf23422 2793 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2794
7e56b5d6 2795 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2796 goto out_free_request_sock_slab;
2797
6d6ee43e 2798 prot->twsk_prot->twsk_slab =
7e56b5d6 2799 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2800 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2801 0,
2802 SLAB_HWCACHE_ALIGN |
2803 prot->slab_flags,
20c2df83 2804 NULL);
6d6ee43e 2805 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2806 goto out_free_timewait_sock_slab_name;
2807 }
1da177e4
LT		 2808 }
2809
36b77a52 2810 mutex_lock(&proto_list_mutex);
1da177e4 2811 list_add(&prot->node, &proto_list);
13ff3d6f 2812 assign_proto_idx(prot);
36b77a52 2813 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2814 return 0;
2815
8feaf0c0 2816out_free_timewait_sock_slab_name:
7e56b5d6 2817 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2818out_free_request_sock_slab:
2819 if (prot->rsk_prot && prot->rsk_prot->slab) {
2820 kmem_cache_destroy(prot->rsk_prot->slab);
2821 prot->rsk_prot->slab = NULL;
2822 }
2e6599cb 2823out_free_request_sock_slab_name:
72150e9b
DC		 2824 if (prot->rsk_prot)
2825 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2826out_free_sock_slab:
2827 kmem_cache_destroy(prot->slab);
2828 prot->slab = NULL;
b733c007
PE		 2829out:
2830 return -ENOBUFS;
1da177e4 2831}
1da177e4
LT		 2832EXPORT_SYMBOL(proto_register);
2833
2834void proto_unregister(struct proto *prot)
2835{
36b77a52 2836 mutex_lock(&proto_list_mutex);
13ff3d6f 2837 release_proto_idx(prot);
0a3f4358 2838 list_del(&prot->node);
36b77a52 2839 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2840
2841 if (prot->slab != NULL) {
2842 kmem_cache_destroy(prot->slab);
2843 prot->slab = NULL;
2844 }
2845
2e6599cb 2846 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2847 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2848 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2849 prot->rsk_prot->slab = NULL;
2850 }
2851
6d6ee43e 2852 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2853 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2854 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2855 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2856 }
1da177e4 2857}
1da177e4
LT		 2858EXPORT_SYMBOL(proto_unregister);
2859
2860#ifdef CONFIG_PROC_FS
1da177e4 2861static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2862 __acquires(proto_list_mutex)
1da177e4 2863{
36b77a52 2864 mutex_lock(&proto_list_mutex);
60f0438a 2865 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2866}
2867
2868static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2869{
60f0438a 2870 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2871}
2872
2873static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2874 __releases(proto_list_mutex)
1da177e4 2875{
36b77a52 2876 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2877}
2878
2879static char proto_method_implemented(const void *method)
2880{
2881 return method == NULL ? 'n' : 'y';
2882}
180d8cd9
GC		 2883static long sock_prot_memory_allocated(struct proto *proto)
2884{
cb75a36c 2885 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2886}
2887
2888static char *sock_prot_memory_pressure(struct proto *proto)
2889{
2890 return proto->memory_pressure != NULL ?
2891 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2892}
1da177e4
LT		 2893
2894static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2895{
180d8cd9 2896
8d987e5c 2897 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2898 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2899 proto->name,
2900 proto->obj_size,
14e943db 2901 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2902 sock_prot_memory_allocated(proto),
2903 sock_prot_memory_pressure(proto),
1da177e4
LT		 2904 proto->max_header,
2905 proto->slab == NULL ? "no" : "yes",
2906 module_name(proto->owner),
2907 proto_method_implemented(proto->close),
2908 proto_method_implemented(proto->connect),
2909 proto_method_implemented(proto->disconnect),
2910 proto_method_implemented(proto->accept),
2911 proto_method_implemented(proto->ioctl),
2912 proto_method_implemented(proto->init),
2913 proto_method_implemented(proto->destroy),
2914 proto_method_implemented(proto->shutdown),
2915 proto_method_implemented(proto->setsockopt),
2916 proto_method_implemented(proto->getsockopt),
2917 proto_method_implemented(proto->sendmsg),
2918 proto_method_implemented(proto->recvmsg),
2919 proto_method_implemented(proto->sendpage),
2920 proto_method_implemented(proto->bind),
2921 proto_method_implemented(proto->backlog_rcv),
2922 proto_method_implemented(proto->hash),
2923 proto_method_implemented(proto->unhash),
2924 proto_method_implemented(proto->get_port),
2925 proto_method_implemented(proto->enter_memory_pressure));
2926}
2927
2928static int proto_seq_show(struct seq_file *seq, void *v)
2929{
60f0438a 2930 if (v == &proto_list)
1da177e4
LT		 2931 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2932 "protocol",
2933 "size",
2934 "sockets",
2935 "memory",
2936 "press",
2937 "maxhdr",
2938 "slab",
2939 "module",
2940 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2941 else
60f0438a 2942 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2943 return 0;
2944}
2945
f690808e 2946static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2947 .start = proto_seq_start,
2948 .next = proto_seq_next,
2949 .stop = proto_seq_stop,
2950 .show = proto_seq_show,
2951};
2952
2953static int proto_seq_open(struct inode *inode, struct file *file)
2954{
14e943db
ED		 2955 return seq_open_net(inode, file, &proto_seq_ops,
2956 sizeof(struct seq_net_private));
1da177e4
LT		 2957}
2958
9a32144e 2959static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2960 .owner = THIS_MODULE,
2961 .open = proto_seq_open,
2962 .read = seq_read,
2963 .llseek = seq_lseek,
14e943db
ED		 2964 .release = seq_release_net,
2965};
2966
2967static __net_init int proto_init_net(struct net *net)
2968{
d4beaa66 2969 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 2970 return -ENOMEM;
2971
2972 return 0;
2973}
2974
2975static __net_exit void proto_exit_net(struct net *net)
2976{
ece31ffd 2977 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 2978}
2979
2980
2981static __net_initdata struct pernet_operations proto_net_ops = {
2982 .init = proto_init_net,
2983 .exit = proto_exit_net,
1da177e4
LT		 2984};
2985
2986static int __init proto_init(void)
2987{
14e943db 2988 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2989}
2990
2991subsys_initcall(proto_init);
2992
2993#endif /* PROC_FS */
Linux kernel - Deliverables
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