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net: ipv6: Make address flushing on ifdown optional
[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>
eb4cb008 134#include <linux/sock_diag.h>
1da177e4
LT		 135
136#include <linux/filter.h>
538950a1 137#include <net/sock_reuseport.h>
1da177e4 138
3847ce32
SM		 139#include <trace/events/sock.h>
140
1da177e4
LT		 141#ifdef CONFIG_INET
142#include <net/tcp.h>
143#endif
144
076bb0c8 145#include <net/busy_poll.h>
06021292 146
36b77a52 147static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 148static LIST_HEAD(proto_list);
149
a3b299da
EB		 150/**
151 * sk_ns_capable - General socket capability test
152 * @sk: Socket to use a capability on or through
153 * @user_ns: The user namespace of the capability to use
154 * @cap: The capability to use
155 *
156 * Test to see if the opener of the socket had when the socket was
157 * created and the current process has the capability @cap in the user
158 * namespace @user_ns.
159 */
160bool sk_ns_capable(const struct sock *sk,
161 struct user_namespace *user_ns, int cap)
162{
163 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
164 ns_capable(user_ns, cap);
165}
166EXPORT_SYMBOL(sk_ns_capable);
167
168/**
169 * sk_capable - Socket global capability test
170 * @sk: Socket to use a capability on or through
e793c0f7 171 * @cap: The global capability to use
a3b299da
EB		 172 *
173 * Test to see if the opener of the socket had when the socket was
174 * created and the current process has the capability @cap in all user
175 * namespaces.
176 */
177bool sk_capable(const struct sock *sk, int cap)
178{
179 return sk_ns_capable(sk, &init_user_ns, cap);
180}
181EXPORT_SYMBOL(sk_capable);
182
183/**
184 * sk_net_capable - Network namespace socket capability test
185 * @sk: Socket to use a capability on or through
186 * @cap: The capability to use
187 *
e793c0f7 188 * Test to see if the opener of the socket had when the socket was created
a3b299da
EB		 189 * and the current process has the capability @cap over the network namespace
190 * the socket is a member of.
191 */
192bool sk_net_capable(const struct sock *sk, int cap)
193{
194 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
195}
196EXPORT_SYMBOL(sk_net_capable);
197
da21f24d
IM		 198/*
199 * Each address family might have different locking rules, so we have
200 * one slock key per address family:
201 */
a5b5bb9a
IM		 202static struct lock_class_key af_family_keys[AF_MAX];
203static struct lock_class_key af_family_slock_keys[AF_MAX];
204
a5b5bb9a
IM		 205/*
206 * Make lock validator output more readable. (we pre-construct these
207 * strings build-time, so that runtime initialization of socket
208 * locks is fast):
209 */
36cbd3dc 210static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 211 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
212 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
213 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
214 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
215 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
216 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
217 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 218 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 219 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 220 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 221 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 222 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 223 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
456db6a4 224 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX"
a5b5bb9a 225};
36cbd3dc 226static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 227 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
228 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
229 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
230 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
231 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
232 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
233 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 234 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 235 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 236 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 237 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 238 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 239 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
456db6a4 240 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX"
a5b5bb9a 241};
36cbd3dc 242static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 243 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
244 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
245 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
246 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
247 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
248 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
249 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 250 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 251 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 252 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 253 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 254 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 255 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
456db6a4 256 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX"
443aef0e 257};
da21f24d
IM		 258
259/*
260 * sk_callback_lock locking rules are per-address-family,
261 * so split the lock classes by using a per-AF key:
262 */
263static struct lock_class_key af_callback_keys[AF_MAX];
264
1da177e4
LT		 265/* Take into consideration the size of the struct sk_buff overhead in the
266 * determination of these values, since that is non-constant across
267 * platforms. This makes socket queueing behavior and performance
268 * not depend upon such differences.
269 */
270#define _SK_MEM_PACKETS 256
87fb4b7b 271#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 272#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
273#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
274
275/* Run time adjustable parameters. */
ab32ea5d 276__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 277EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 278__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 279EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 280__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
281__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 282
25985edc 283/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 284int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 285EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 286
b245be1f
WB		 287int sysctl_tstamp_allow_data __read_mostly = 1;
288
c93bdd0e
MG		 289struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
290EXPORT_SYMBOL_GPL(memalloc_socks);
291
7cb02404
MG		 292/**
293 * sk_set_memalloc - sets %SOCK_MEMALLOC
294 * @sk: socket to set it on
295 *
296 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
297 * It's the responsibility of the admin to adjust min_free_kbytes
298 * to meet the requirements
299 */
300void sk_set_memalloc(struct sock *sk)
301{
302 sock_set_flag(sk, SOCK_MEMALLOC);
303 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 304 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 305}
306EXPORT_SYMBOL_GPL(sk_set_memalloc);
307
308void sk_clear_memalloc(struct sock *sk)
309{
310 sock_reset_flag(sk, SOCK_MEMALLOC);
311 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 312 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 313
314 /*
315 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
5d753610
MG		 316 * progress of swapping. SOCK_MEMALLOC may be cleared while
317 * it has rmem allocations due to the last swapfile being deactivated
318 * but there is a risk that the socket is unusable due to exceeding
319 * the rmem limits. Reclaim the reserves and obey rmem limits again.
c76562b6 320 */
5d753610 321 sk_mem_reclaim(sk);
7cb02404
MG		 322}
323EXPORT_SYMBOL_GPL(sk_clear_memalloc);
324
b4b9e355
MG		 325int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
326{
327 int ret;
328 unsigned long pflags = current->flags;
329
330 /* these should have been dropped before queueing */
331 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
332
333 current->flags |= PF_MEMALLOC;
334 ret = sk->sk_backlog_rcv(sk, skb);
335 tsk_restore_flags(current, pflags, PF_MEMALLOC);
336
337 return ret;
338}
339EXPORT_SYMBOL(__sk_backlog_rcv);
340
1da177e4
LT		 341static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
342{
343 struct timeval tv;
344
345 if (optlen < sizeof(tv))
346 return -EINVAL;
347 if (copy_from_user(&tv, optval, sizeof(tv)))
348 return -EFAULT;
ba78073e
VA		 349 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
350 return -EDOM;
1da177e4 351
ba78073e 352 if (tv.tv_sec < 0) {
6f11df83
AM		 353 static int warned __read_mostly;
354
ba78073e 355 *timeo_p = 0;
50aab54f 356 if (warned < 10 && net_ratelimit()) {
ba78073e 357 warned++;
e005d193
JP		 358 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
359 __func__, current->comm, task_pid_nr(current));
50aab54f 360 }
ba78073e
VA		 361 return 0;
362 }
1da177e4
LT		 363 *timeo_p = MAX_SCHEDULE_TIMEOUT;
364 if (tv.tv_sec == 0 && tv.tv_usec == 0)
365 return 0;
366 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
367 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
368 return 0;
369}
370
371static void sock_warn_obsolete_bsdism(const char *name)
372{
373 static int warned;
374 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 375 if (strcmp(warncomm, current->comm) && warned < 5) {
376 strcpy(warncomm, current->comm);
e005d193
JP		 377 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
378 warncomm, name);
1da177e4
LT		 379 warned++;
380 }
381}
382
080a270f
HFS		 383static bool sock_needs_netstamp(const struct sock *sk)
384{
385 switch (sk->sk_family) {
386 case AF_UNSPEC:
387 case AF_UNIX:
388 return false;
389 default:
390 return true;
391 }
392}
393
08e29af3 394static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 395{
08e29af3
ED		 396 if (sk->sk_flags & flags) {
397 sk->sk_flags &= ~flags;
080a270f
HFS		 398 if (sock_needs_netstamp(sk) &&
399 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 400 net_disable_timestamp();
1da177e4
LT		 401 }
402}
403
404
f0088a50
DV		 405int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
406{
766e9037 407 int err;
3b885787
NH		 408 unsigned long flags;
409 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 410
0fd7bac6 411 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 412 atomic_inc(&sk->sk_drops);
3847ce32 413 trace_sock_rcvqueue_full(sk, skb);
766e9037 414 return -ENOMEM;
f0088a50
DV		 415 }
416
fda9ef5d 417 err = sk_filter(sk, skb);
f0088a50 418 if (err)
766e9037 419 return err;
f0088a50 420
c76562b6 421 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 422 atomic_inc(&sk->sk_drops);
423 return -ENOBUFS;
3ab224be
HA		 424 }
425
f0088a50
DV		 426 skb->dev = NULL;
427 skb_set_owner_r(skb, sk);
49ad9599 428
7fee226a
ED		 429 /* we escape from rcu protected region, make sure we dont leak
430 * a norefcounted dst
431 */
432 skb_dst_force(skb);
433
3b885787 434 spin_lock_irqsave(&list->lock, flags);
3bc3b96f 435 sock_skb_set_dropcount(sk, skb);
3b885787
NH		 436 __skb_queue_tail(list, skb);
437 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 438
439 if (!sock_flag(sk, SOCK_DEAD))
676d2369 440 sk->sk_data_ready(sk);
766e9037 441 return 0;
f0088a50
DV		 442}
443EXPORT_SYMBOL(sock_queue_rcv_skb);
444
58a5a7b9 445int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 446{
447 int rc = NET_RX_SUCCESS;
448
fda9ef5d 449 if (sk_filter(sk, skb))
f0088a50
DV		 450 goto discard_and_relse;
451
452 skb->dev = NULL;
453
274f482d 454 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 455 atomic_inc(&sk->sk_drops);
456 goto discard_and_relse;
457 }
58a5a7b9
ACM		 458 if (nested)
459 bh_lock_sock_nested(sk);
460 else
461 bh_lock_sock(sk);
a5b5bb9a
IM		 462 if (!sock_owned_by_user(sk)) {
463 /*
464 * trylock + unlock semantics:
465 */
466 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
467
c57943a1 468 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 469
470 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 471 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 472 bh_unlock_sock(sk);
473 atomic_inc(&sk->sk_drops);
474 goto discard_and_relse;
475 }
476
f0088a50
DV		 477 bh_unlock_sock(sk);
478out:
479 sock_put(sk);
480 return rc;
481discard_and_relse:
482 kfree_skb(skb);
483 goto out;
484}
485EXPORT_SYMBOL(sk_receive_skb);
486
487struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
488{
b6c6712a 489 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 490
491 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 492 sk_tx_queue_clear(sk);
a9b3cd7f 493 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 494 dst_release(dst);
495 return NULL;
496 }
497
498 return dst;
499}
500EXPORT_SYMBOL(__sk_dst_check);
501
502struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
503{
504 struct dst_entry *dst = sk_dst_get(sk);
505
506 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
507 sk_dst_reset(sk);
508 dst_release(dst);
509 return NULL;
510 }
511
512 return dst;
513}
514EXPORT_SYMBOL(sk_dst_check);
515
c91f6df2
BH		 516static int sock_setbindtodevice(struct sock *sk, char __user *optval,
517 int optlen)
4878809f
DM		 518{
519 int ret = -ENOPROTOOPT;
520#ifdef CONFIG_NETDEVICES
3b1e0a65 521 struct net *net = sock_net(sk);
4878809f
DM		 522 char devname[IFNAMSIZ];
523 int index;
524
525 /* Sorry... */
526 ret = -EPERM;
5e1fccc0 527 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 528 goto out;
529
530 ret = -EINVAL;
531 if (optlen < 0)
532 goto out;
533
534 /* Bind this socket to a particular device like "eth0",
535 * as specified in the passed interface name. If the
536 * name is "" or the option length is zero the socket
537 * is not bound.
538 */
539 if (optlen > IFNAMSIZ - 1)
540 optlen = IFNAMSIZ - 1;
541 memset(devname, 0, sizeof(devname));
542
543 ret = -EFAULT;
544 if (copy_from_user(devname, optval, optlen))
545 goto out;
546
000ba2e4
DM		 547 index = 0;
548 if (devname[0] != '\0') {
bf8e56bf 549 struct net_device *dev;
4878809f 550
bf8e56bf
ED		 551 rcu_read_lock();
552 dev = dev_get_by_name_rcu(net, devname);
553 if (dev)
554 index = dev->ifindex;
555 rcu_read_unlock();
4878809f
DM		 556 ret = -ENODEV;
557 if (!dev)
558 goto out;
4878809f
DM		 559 }
560
561 lock_sock(sk);
562 sk->sk_bound_dev_if = index;
563 sk_dst_reset(sk);
564 release_sock(sk);
565
566 ret = 0;
567
568out:
569#endif
570
571 return ret;
572}
573
c91f6df2
BH		 574static int sock_getbindtodevice(struct sock *sk, char __user *optval,
575 int __user *optlen, int len)
576{
577 int ret = -ENOPROTOOPT;
578#ifdef CONFIG_NETDEVICES
579 struct net *net = sock_net(sk);
c91f6df2 580 char devname[IFNAMSIZ];
c91f6df2
BH		 581
582 if (sk->sk_bound_dev_if == 0) {
583 len = 0;
584 goto zero;
585 }
586
587 ret = -EINVAL;
588 if (len < IFNAMSIZ)
589 goto out;
590
5dbe7c17
NS		 591 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
592 if (ret)
c91f6df2 593 goto out;
c91f6df2
BH		 594
595 len = strlen(devname) + 1;
596
597 ret = -EFAULT;
598 if (copy_to_user(optval, devname, len))
599 goto out;
600
601zero:
602 ret = -EFAULT;
603 if (put_user(len, optlen))
604 goto out;
605
606 ret = 0;
607
608out:
609#endif
610
611 return ret;
612}
613
c0ef877b
PE		 614static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
615{
616 if (valbool)
617 sock_set_flag(sk, bit);
618 else
619 sock_reset_flag(sk, bit);
620}
621
f60e5990 622bool sk_mc_loop(struct sock *sk)
623{
624 if (dev_recursion_level())
625 return false;
626 if (!sk)
627 return true;
628 switch (sk->sk_family) {
629 case AF_INET:
630 return inet_sk(sk)->mc_loop;
631#if IS_ENABLED(CONFIG_IPV6)
632 case AF_INET6:
633 return inet6_sk(sk)->mc_loop;
634#endif
635 }
636 WARN_ON(1);
637 return true;
638}
639EXPORT_SYMBOL(sk_mc_loop);
640
1da177e4
LT		 641/*
642 * This is meant for all protocols to use and covers goings on
643 * at the socket level. Everything here is generic.
644 */
645
646int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 647 char __user *optval, unsigned int optlen)
1da177e4 648{
2a91525c 649 struct sock *sk = sock->sk;
1da177e4
LT		 650 int val;
651 int valbool;
652 struct linger ling;
653 int ret = 0;
4ec93edb 654
1da177e4
LT		 655 /*
656 * Options without arguments
657 */
658
4878809f 659 if (optname == SO_BINDTODEVICE)
c91f6df2 660 return sock_setbindtodevice(sk, optval, optlen);
4878809f 661
e71a4783
SH		 662 if (optlen < sizeof(int))
663 return -EINVAL;
4ec93edb 664
1da177e4
LT		 665 if (get_user(val, (int __user *)optval))
666 return -EFAULT;
4ec93edb 667
2a91525c 668 valbool = val ? 1 : 0;
1da177e4
LT		 669
670 lock_sock(sk);
671
2a91525c 672 switch (optname) {
e71a4783 673 case SO_DEBUG:
2a91525c 674 if (val && !capable(CAP_NET_ADMIN))
e71a4783 675 ret = -EACCES;
2a91525c 676 else
c0ef877b 677 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 678 break;
679 case SO_REUSEADDR:
4a17fd52 680 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 681 break;
055dc21a
TH		 682 case SO_REUSEPORT:
683 sk->sk_reuseport = valbool;
684 break;
e71a4783 685 case SO_TYPE:
49c794e9 686 case SO_PROTOCOL:
0d6038ee 687 case SO_DOMAIN:
e71a4783
SH		 688 case SO_ERROR:
689 ret = -ENOPROTOOPT;
690 break;
691 case SO_DONTROUTE:
c0ef877b 692 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 693 break;
694 case SO_BROADCAST:
695 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
696 break;
697 case SO_SNDBUF:
698 /* Don't error on this BSD doesn't and if you think
82981930
ED		 699 * about it this is right. Otherwise apps have to
700 * play 'guess the biggest size' games. RCVBUF/SNDBUF
701 * are treated in BSD as hints
702 */
703 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 704set_sndbuf:
e71a4783 705 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 706 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
707 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 708 sk->sk_write_space(sk);
709 break;
1da177e4 710
e71a4783
SH		 711 case SO_SNDBUFFORCE:
712 if (!capable(CAP_NET_ADMIN)) {
713 ret = -EPERM;
714 break;
715 }
716 goto set_sndbuf;
b0573dea 717
e71a4783
SH		 718 case SO_RCVBUF:
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_rmem_max);
b0573dea 725set_rcvbuf:
e71a4783
SH		 726 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
727 /*
728 * We double it on the way in to account for
729 * "struct sk_buff" etc. overhead. Applications
730 * assume that the SO_RCVBUF setting they make will
731 * allow that much actual data to be received on that
732 * socket.
733 *
734 * Applications are unaware that "struct sk_buff" and
735 * other overheads allocate from the receive buffer
736 * during socket buffer allocation.
737 *
738 * And after considering the possible alternatives,
739 * returning the value we actually used in getsockopt
740 * is the most desirable behavior.
741 */
82981930 742 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 743 break;
744
745 case SO_RCVBUFFORCE:
746 if (!capable(CAP_NET_ADMIN)) {
747 ret = -EPERM;
1da177e4 748 break;
e71a4783
SH		 749 }
750 goto set_rcvbuf;
1da177e4 751
e71a4783 752 case SO_KEEPALIVE:
1da177e4 753#ifdef CONFIG_INET
3e10986d
ED		 754 if (sk->sk_protocol == IPPROTO_TCP &&
755 sk->sk_type == SOCK_STREAM)
e71a4783 756 tcp_set_keepalive(sk, valbool);
1da177e4 757#endif
e71a4783
SH		 758 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
759 break;
760
761 case SO_OOBINLINE:
762 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
763 break;
764
765 case SO_NO_CHECK:
28448b80 766 sk->sk_no_check_tx = valbool;
e71a4783
SH		 767 break;
768
769 case SO_PRIORITY:
5e1fccc0
EB		 770 if ((val >= 0 && val <= 6) ||
771 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 772 sk->sk_priority = val;
773 else
774 ret = -EPERM;
775 break;
776
777 case SO_LINGER:
778 if (optlen < sizeof(ling)) {
779 ret = -EINVAL; /* 1003.1g */
1da177e4 780 break;
e71a4783 781 }
2a91525c 782 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 783 ret = -EFAULT;
1da177e4 784 break;
e71a4783
SH		 785 }
786 if (!ling.l_onoff)
787 sock_reset_flag(sk, SOCK_LINGER);
788 else {
1da177e4 789#if (BITS_PER_LONG == 32)
e71a4783
SH		 790 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
791 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 792 else
e71a4783
SH		 793#endif
794 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
795 sock_set_flag(sk, SOCK_LINGER);
796 }
797 break;
798
799 case SO_BSDCOMPAT:
800 sock_warn_obsolete_bsdism("setsockopt");
801 break;
802
803 case SO_PASSCRED:
804 if (valbool)
805 set_bit(SOCK_PASSCRED, &sock->flags);
806 else
807 clear_bit(SOCK_PASSCRED, &sock->flags);
808 break;
809
810 case SO_TIMESTAMP:
92f37fd2 811 case SO_TIMESTAMPNS:
e71a4783 812 if (valbool) {
92f37fd2
ED		 813 if (optname == SO_TIMESTAMP)
814 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
815 else
816 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 817 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 818 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 819 } else {
e71a4783 820 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 821 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
822 }
e71a4783
SH		 823 break;
824
20d49473
PO		 825 case SO_TIMESTAMPING:
826 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 827 ret = -EINVAL;
20d49473
PO		 828 break;
829 }
b245be1f 830
09c2d251 831 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765 832 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
ac5cc977
WC		 833 if (sk->sk_protocol == IPPROTO_TCP &&
834 sk->sk_type == SOCK_STREAM) {
4ed2d765
WB		 835 if (sk->sk_state != TCP_ESTABLISHED) {
836 ret = -EINVAL;
837 break;
838 }
839 sk->sk_tskey = tcp_sk(sk)->snd_una;
840 } else {
841 sk->sk_tskey = 0;
842 }
843 }
b9f40e21 844 sk->sk_tsflags = val;
20d49473
PO		 845 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
846 sock_enable_timestamp(sk,
847 SOCK_TIMESTAMPING_RX_SOFTWARE);
848 else
849 sock_disable_timestamp(sk,
08e29af3 850 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 851 break;
852
e71a4783
SH		 853 case SO_RCVLOWAT:
854 if (val < 0)
855 val = INT_MAX;
856 sk->sk_rcvlowat = val ? : 1;
857 break;
858
859 case SO_RCVTIMEO:
860 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
861 break;
862
863 case SO_SNDTIMEO:
864 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
865 break;
1da177e4 866
e71a4783
SH		 867 case SO_ATTACH_FILTER:
868 ret = -EINVAL;
869 if (optlen == sizeof(struct sock_fprog)) {
870 struct sock_fprog fprog;
1da177e4 871
e71a4783
SH		 872 ret = -EFAULT;
873 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 874 break;
e71a4783
SH		 875
876 ret = sk_attach_filter(&fprog, sk);
877 }
878 break;
879
89aa0758
AS		 880 case SO_ATTACH_BPF:
881 ret = -EINVAL;
882 if (optlen == sizeof(u32)) {
883 u32 ufd;
884
885 ret = -EFAULT;
886 if (copy_from_user(&ufd, optval, sizeof(ufd)))
887 break;
888
889 ret = sk_attach_bpf(ufd, sk);
890 }
891 break;
892
538950a1
CG		 893 case SO_ATTACH_REUSEPORT_CBPF:
894 ret = -EINVAL;
895 if (optlen == sizeof(struct sock_fprog)) {
896 struct sock_fprog fprog;
897
898 ret = -EFAULT;
899 if (copy_from_user(&fprog, optval, sizeof(fprog)))
900 break;
901
902 ret = sk_reuseport_attach_filter(&fprog, sk);
903 }
904 break;
905
906 case SO_ATTACH_REUSEPORT_EBPF:
907 ret = -EINVAL;
908 if (optlen == sizeof(u32)) {
909 u32 ufd;
910
911 ret = -EFAULT;
912 if (copy_from_user(&ufd, optval, sizeof(ufd)))
913 break;
914
915 ret = sk_reuseport_attach_bpf(ufd, sk);
916 }
917 break;
918
e71a4783 919 case SO_DETACH_FILTER:
55b33325 920 ret = sk_detach_filter(sk);
e71a4783 921 break;
1da177e4 922
d59577b6
VB		 923 case SO_LOCK_FILTER:
924 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
925 ret = -EPERM;
926 else
927 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
928 break;
929
e71a4783
SH		 930 case SO_PASSSEC:
931 if (valbool)
932 set_bit(SOCK_PASSSEC, &sock->flags);
933 else
934 clear_bit(SOCK_PASSSEC, &sock->flags);
935 break;
4a19ec58 936 case SO_MARK:
5e1fccc0 937 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 938 ret = -EPERM;
2a91525c 939 else
4a19ec58 940 sk->sk_mark = val;
4a19ec58 941 break;
877ce7c1 942
3b885787 943 case SO_RXQ_OVFL:
8083f0fc 944 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 945 break;
6e3e939f
JB		 946
947 case SO_WIFI_STATUS:
948 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
949 break;
950
ef64a54f
PE		 951 case SO_PEEK_OFF:
952 if (sock->ops->set_peek_off)
12663bfc 953 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 954 else
955 ret = -EOPNOTSUPP;
956 break;
3bdc0eba
BG		 957
958 case SO_NOFCS:
959 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
960 break;
961
7d4c04fc
KJ		 962 case SO_SELECT_ERR_QUEUE:
963 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
964 break;
965
e0d1095a 966#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 967 case SO_BUSY_POLL:
dafcc438
ET		 968 /* allow unprivileged users to decrease the value */
969 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
970 ret = -EPERM;
971 else {
972 if (val < 0)
973 ret = -EINVAL;
974 else
975 sk->sk_ll_usec = val;
976 }
977 break;
978#endif
62748f32
ED		 979
980 case SO_MAX_PACING_RATE:
981 sk->sk_max_pacing_rate = val;
982 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
983 sk->sk_max_pacing_rate);
984 break;
985
70da268b
ED		 986 case SO_INCOMING_CPU:
987 sk->sk_incoming_cpu = val;
988 break;
989
e71a4783
SH		 990 default:
991 ret = -ENOPROTOOPT;
992 break;
4ec93edb 993 }
1da177e4
LT		 994 release_sock(sk);
995 return ret;
996}
2a91525c 997EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 998
999
8f09898b 1000static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1001 struct ucred *ucred)
3f551f94
EB		 1002{
1003 ucred->pid = pid_vnr(pid);
1004 ucred->uid = ucred->gid = -1;
1005 if (cred) {
1006 struct user_namespace *current_ns = current_user_ns();
1007
b2e4f544
EB		 1008 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1009 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 1010 }
1011}
1012
1da177e4
LT		 1013int sock_getsockopt(struct socket *sock, int level, int optname,
1014 char __user *optval, int __user *optlen)
1015{
1016 struct sock *sk = sock->sk;
4ec93edb 1017
e71a4783 1018 union {
4ec93edb
YH		 1019 int val;
1020 struct linger ling;
1da177e4
LT		 1021 struct timeval tm;
1022 } v;
4ec93edb 1023
4d0392be 1024 int lv = sizeof(int);
1da177e4 1025 int len;
4ec93edb 1026
e71a4783 1027 if (get_user(len, optlen))
4ec93edb 1028 return -EFAULT;
e71a4783 1029 if (len < 0)
1da177e4 1030 return -EINVAL;
4ec93edb 1031
50fee1de 1032 memset(&v, 0, sizeof(v));
df0bca04 1033
2a91525c 1034 switch (optname) {
e71a4783
SH		 1035 case SO_DEBUG:
1036 v.val = sock_flag(sk, SOCK_DBG);
1037 break;
1038
1039 case SO_DONTROUTE:
1040 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1041 break;
1042
1043 case SO_BROADCAST:
1b23a5df 1044 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1045 break;
1046
1047 case SO_SNDBUF:
1048 v.val = sk->sk_sndbuf;
1049 break;
1050
1051 case SO_RCVBUF:
1052 v.val = sk->sk_rcvbuf;
1053 break;
1054
1055 case SO_REUSEADDR:
1056 v.val = sk->sk_reuse;
1057 break;
1058
055dc21a
TH		 1059 case SO_REUSEPORT:
1060 v.val = sk->sk_reuseport;
1061 break;
1062
e71a4783 1063 case SO_KEEPALIVE:
1b23a5df 1064 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1065 break;
1066
1067 case SO_TYPE:
1068 v.val = sk->sk_type;
1069 break;
1070
49c794e9
JE		 1071 case SO_PROTOCOL:
1072 v.val = sk->sk_protocol;
1073 break;
1074
0d6038ee
JE		 1075 case SO_DOMAIN:
1076 v.val = sk->sk_family;
1077 break;
1078
e71a4783
SH		 1079 case SO_ERROR:
1080 v.val = -sock_error(sk);
2a91525c 1081 if (v.val == 0)
e71a4783
SH		 1082 v.val = xchg(&sk->sk_err_soft, 0);
1083 break;
1084
1085 case SO_OOBINLINE:
1b23a5df 1086 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1087 break;
1088
1089 case SO_NO_CHECK:
28448b80 1090 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1091 break;
1092
1093 case SO_PRIORITY:
1094 v.val = sk->sk_priority;
1095 break;
1096
1097 case SO_LINGER:
1098 lv = sizeof(v.ling);
1b23a5df 1099 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1100 v.ling.l_linger = sk->sk_lingertime / HZ;
1101 break;
1102
1103 case SO_BSDCOMPAT:
1104 sock_warn_obsolete_bsdism("getsockopt");
1105 break;
1106
1107 case SO_TIMESTAMP:
92f37fd2
ED		 1108 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1109 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1110 break;
1111
1112 case SO_TIMESTAMPNS:
1113 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1114 break;
1115
20d49473 1116 case SO_TIMESTAMPING:
b9f40e21 1117 v.val = sk->sk_tsflags;
20d49473
PO		 1118 break;
1119
e71a4783 1120 case SO_RCVTIMEO:
2a91525c 1121 lv = sizeof(struct timeval);
e71a4783
SH		 1122 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1123 v.tm.tv_sec = 0;
1124 v.tm.tv_usec = 0;
1125 } else {
1126 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1127 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1128 }
1129 break;
1130
1131 case SO_SNDTIMEO:
2a91525c 1132 lv = sizeof(struct timeval);
e71a4783
SH		 1133 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1134 v.tm.tv_sec = 0;
1135 v.tm.tv_usec = 0;
1136 } else {
1137 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1138 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1139 }
1140 break;
1da177e4 1141
e71a4783
SH		 1142 case SO_RCVLOWAT:
1143 v.val = sk->sk_rcvlowat;
1144 break;
1da177e4 1145
e71a4783 1146 case SO_SNDLOWAT:
2a91525c 1147 v.val = 1;
e71a4783 1148 break;
1da177e4 1149
e71a4783 1150 case SO_PASSCRED:
82981930 1151 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1152 break;
1da177e4 1153
e71a4783 1154 case SO_PEERCRED:
109f6e39
EB		 1155 {
1156 struct ucred peercred;
1157 if (len > sizeof(peercred))
1158 len = sizeof(peercred);
1159 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1160 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1161 return -EFAULT;
1162 goto lenout;
109f6e39 1163 }
1da177e4 1164
e71a4783
SH		 1165 case SO_PEERNAME:
1166 {
1167 char address[128];
1168
1169 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1170 return -ENOTCONN;
1171 if (lv < len)
1172 return -EINVAL;
1173 if (copy_to_user(optval, address, len))
1174 return -EFAULT;
1175 goto lenout;
1176 }
1da177e4 1177
e71a4783
SH		 1178 /* Dubious BSD thing... Probably nobody even uses it, but
1179 * the UNIX standard wants it for whatever reason... -DaveM
1180 */
1181 case SO_ACCEPTCONN:
1182 v.val = sk->sk_state == TCP_LISTEN;
1183 break;
1da177e4 1184
e71a4783 1185 case SO_PASSSEC:
82981930 1186 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1187 break;
877ce7c1 1188
e71a4783
SH		 1189 case SO_PEERSEC:
1190 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1191
4a19ec58
LAT		 1192 case SO_MARK:
1193 v.val = sk->sk_mark;
1194 break;
1195
3b885787 1196 case SO_RXQ_OVFL:
1b23a5df 1197 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1198 break;
1199
6e3e939f 1200 case SO_WIFI_STATUS:
1b23a5df 1201 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1202 break;
1203
ef64a54f
PE		 1204 case SO_PEEK_OFF:
1205 if (!sock->ops->set_peek_off)
1206 return -EOPNOTSUPP;
1207
1208 v.val = sk->sk_peek_off;
1209 break;
bc2f7996 1210 case SO_NOFCS:
1b23a5df 1211 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1212 break;
c91f6df2 1213
f7b86bfe 1214 case SO_BINDTODEVICE:
c91f6df2
BH		 1215 return sock_getbindtodevice(sk, optval, optlen, len);
1216
a8fc9277
PE		 1217 case SO_GET_FILTER:
1218 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1219 if (len < 0)
1220 return len;
1221
1222 goto lenout;
c91f6df2 1223
d59577b6
VB		 1224 case SO_LOCK_FILTER:
1225 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1226 break;
1227
ea02f941
MS		 1228 case SO_BPF_EXTENSIONS:
1229 v.val = bpf_tell_extensions();
1230 break;
1231
7d4c04fc
KJ		 1232 case SO_SELECT_ERR_QUEUE:
1233 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1234 break;
1235
e0d1095a 1236#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1237 case SO_BUSY_POLL:
dafcc438
ET		 1238 v.val = sk->sk_ll_usec;
1239 break;
1240#endif
1241
62748f32
ED		 1242 case SO_MAX_PACING_RATE:
1243 v.val = sk->sk_max_pacing_rate;
1244 break;
1245
2c8c56e1
ED		 1246 case SO_INCOMING_CPU:
1247 v.val = sk->sk_incoming_cpu;
1248 break;
1249
e71a4783 1250 default:
443b5991
YH		 1251 /* We implement the SO_SNDLOWAT etc to not be settable
1252 * (1003.1g 7).
1253 */
e71a4783 1254 return -ENOPROTOOPT;
1da177e4 1255 }
e71a4783 1256
1da177e4
LT		 1257 if (len > lv)
1258 len = lv;
1259 if (copy_to_user(optval, &v, len))
1260 return -EFAULT;
1261lenout:
4ec93edb
YH		 1262 if (put_user(len, optlen))
1263 return -EFAULT;
1264 return 0;
1da177e4
LT		 1265}
1266
a5b5bb9a
IM		 1267/*
1268 * Initialize an sk_lock.
1269 *
1270 * (We also register the sk_lock with the lock validator.)
1271 */
b6f99a21 1272static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1273{
ed07536e
PZ		 1274 sock_lock_init_class_and_name(sk,
1275 af_family_slock_key_strings[sk->sk_family],
1276 af_family_slock_keys + sk->sk_family,
1277 af_family_key_strings[sk->sk_family],
1278 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1279}
1280
4dc6dc71
ED		 1281/*
1282 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1283 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1284 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1285 */
f1a6c4da
PE		 1286static void sock_copy(struct sock *nsk, const struct sock *osk)
1287{
1288#ifdef CONFIG_SECURITY_NETWORK
1289 void *sptr = nsk->sk_security;
1290#endif
68835aba
ED		 1291 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1292
1293 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1294 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1295
f1a6c4da
PE		 1296#ifdef CONFIG_SECURITY_NETWORK
1297 nsk->sk_security = sptr;
1298 security_sk_clone(osk, nsk);
1299#endif
1300}
1301
fcbdf09d
OP		 1302void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1303{
1304 unsigned long nulls1, nulls2;
1305
1306 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1307 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1308 if (nulls1 > nulls2)
1309 swap(nulls1, nulls2);
1310
1311 if (nulls1 != 0)
1312 memset((char *)sk, 0, nulls1);
1313 memset((char *)sk + nulls1 + sizeof(void *), 0,
1314 nulls2 - nulls1 - sizeof(void *));
1315 memset((char *)sk + nulls2 + sizeof(void *), 0,
1316 size - nulls2 - sizeof(void *));
1317}
1318EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1319
2e4afe7b
PE		 1320static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1321 int family)
c308c1b2
PE		 1322{
1323 struct sock *sk;
1324 struct kmem_cache *slab;
1325
1326 slab = prot->slab;
e912b114
ED		 1327 if (slab != NULL) {
1328 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1329 if (!sk)
1330 return sk;
1331 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1332 if (prot->clear_sk)
1333 prot->clear_sk(sk, prot->obj_size);
1334 else
1335 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1336 }
fcbdf09d 1337 } else
c308c1b2
PE		 1338 sk = kmalloc(prot->obj_size, priority);
1339
2e4afe7b 1340 if (sk != NULL) {
a98b65a3
VN		 1341 kmemcheck_annotate_bitfield(sk, flags);
1342
2e4afe7b
PE		 1343 if (security_sk_alloc(sk, family, priority))
1344 goto out_free;
1345
1346 if (!try_module_get(prot->owner))
1347 goto out_free_sec;
e022f0b4 1348 sk_tx_queue_clear(sk);
bd1060a1 1349 cgroup_sk_alloc(&sk->sk_cgrp_data);
2e4afe7b
PE		 1350 }
1351
c308c1b2 1352 return sk;
2e4afe7b
PE		 1353
1354out_free_sec:
1355 security_sk_free(sk);
1356out_free:
1357 if (slab != NULL)
1358 kmem_cache_free(slab, sk);
1359 else
1360 kfree(sk);
1361 return NULL;
c308c1b2
PE		 1362}
1363
1364static void sk_prot_free(struct proto *prot, struct sock *sk)
1365{
1366 struct kmem_cache *slab;
2e4afe7b 1367 struct module *owner;
c308c1b2 1368
2e4afe7b 1369 owner = prot->owner;
c308c1b2 1370 slab = prot->slab;
2e4afe7b 1371
bd1060a1 1372 cgroup_sk_free(&sk->sk_cgrp_data);
2e4afe7b 1373 security_sk_free(sk);
c308c1b2
PE		 1374 if (slab != NULL)
1375 kmem_cache_free(slab, sk);
1376 else
1377 kfree(sk);
2e4afe7b 1378 module_put(owner);
c308c1b2
PE		 1379}
1380
1da177e4
LT		 1381/**
1382 * sk_alloc - All socket objects are allocated here
c4ea43c5 1383 * @net: the applicable net namespace
4dc3b16b
PP		 1384 * @family: protocol family
1385 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1386 * @prot: struct proto associated with this new sock instance
11aa9c28 1387 * @kern: is this to be a kernel socket?
1da177e4 1388 */
1b8d7ae4 1389struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
11aa9c28 1390 struct proto *prot, int kern)
1da177e4 1391{
c308c1b2 1392 struct sock *sk;
1da177e4 1393
154adbc8 1394 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1395 if (sk) {
154adbc8
PE		 1396 sk->sk_family = family;
1397 /*
1398 * See comment in struct sock definition to understand
1399 * why we need sk_prot_creator -acme
1400 */
1401 sk->sk_prot = sk->sk_prot_creator = prot;
1402 sock_lock_init(sk);
26abe143
EB		 1403 sk->sk_net_refcnt = kern ? 0 : 1;
1404 if (likely(sk->sk_net_refcnt))
1405 get_net(net);
1406 sock_net_set(sk, net);
d66ee058 1407 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1408
2a56a1fe
TH		 1409 sock_update_classid(&sk->sk_cgrp_data);
1410 sock_update_netprioidx(&sk->sk_cgrp_data);
1da177e4 1411 }
a79af59e 1412
2e4afe7b 1413 return sk;
1da177e4 1414}
2a91525c 1415EXPORT_SYMBOL(sk_alloc);
1da177e4 1416
eb4cb008 1417void sk_destruct(struct sock *sk)
1da177e4
LT		 1418{
1419 struct sk_filter *filter;
1da177e4
LT		 1420
1421 if (sk->sk_destruct)
1422 sk->sk_destruct(sk);
1423
a898def2
PM		 1424 filter = rcu_dereference_check(sk->sk_filter,
1425 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1426 if (filter) {
309dd5fc 1427 sk_filter_uncharge(sk, filter);
a9b3cd7f 1428 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4 1429 }
538950a1
CG		 1430 if (rcu_access_pointer(sk->sk_reuseport_cb))
1431 reuseport_detach_sock(sk);
1da177e4 1432
08e29af3 1433 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1434
1435 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1436 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1437 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1438
109f6e39
EB		 1439 if (sk->sk_peer_cred)
1440 put_cred(sk->sk_peer_cred);
1441 put_pid(sk->sk_peer_pid);
26abe143
EB		 1442 if (likely(sk->sk_net_refcnt))
1443 put_net(sock_net(sk));
c308c1b2 1444 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1445}
2b85a34e 1446
eb4cb008
CG		 1447static void __sk_free(struct sock *sk)
1448{
b922622e 1449 if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt))
eb4cb008
CG		 1450 sock_diag_broadcast_destroy(sk);
1451 else
1452 sk_destruct(sk);
1453}
1454
2b85a34e
ED		 1455void sk_free(struct sock *sk)
1456{
1457 /*
25985edc 1458 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1459 * some packets are still in some tx queue.
1460 * If not null, sock_wfree() will call __sk_free(sk) later
1461 */
1462 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1463 __sk_free(sk);
1464}
2a91525c 1465EXPORT_SYMBOL(sk_free);
1da177e4 1466
e56c57d0
ED		 1467/**
1468 * sk_clone_lock - clone a socket, and lock its clone
1469 * @sk: the socket to clone
1470 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1471 *
1472 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1473 */
1474struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1475{
8fd1d178 1476 struct sock *newsk;
278571ba 1477 bool is_charged = true;
87d11ceb 1478
8fd1d178 1479 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1480 if (newsk != NULL) {
1481 struct sk_filter *filter;
1482
892c141e 1483 sock_copy(newsk, sk);
87d11ceb
ACM		 1484
1485 /* SANITY */
8a681736
SV		 1486 if (likely(newsk->sk_net_refcnt))
1487 get_net(sock_net(newsk));
87d11ceb
ACM		 1488 sk_node_init(&newsk->sk_node);
1489 sock_lock_init(newsk);
1490 bh_lock_sock(newsk);
fa438ccf 1491 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1492 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1493
1494 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1495 /*
1496 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1497 */
1498 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1499 atomic_set(&newsk->sk_omem_alloc, 0);
1500 skb_queue_head_init(&newsk->sk_receive_queue);
1501 skb_queue_head_init(&newsk->sk_write_queue);
1502
87d11ceb 1503 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1504 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1505 af_callback_keys + newsk->sk_family,
1506 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1507
1508 newsk->sk_dst_cache = NULL;
1509 newsk->sk_wmem_queued = 0;
1510 newsk->sk_forward_alloc = 0;
1511 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1512 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1513
1514 sock_reset_flag(newsk, SOCK_DONE);
1515 skb_queue_head_init(&newsk->sk_error_queue);
1516
0d7da9dd 1517 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb 1518 if (filter != NULL)
278571ba
AS		 1519 /* though it's an empty new sock, the charging may fail
1520 * if sysctl_optmem_max was changed between creation of
1521 * original socket and cloning
1522 */
1523 is_charged = sk_filter_charge(newsk, filter);
87d11ceb 1524
d188ba86 1525 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
87d11ceb
ACM		 1526 /* It is still raw copy of parent, so invalidate
1527 * destructor and make plain sk_free() */
1528 newsk->sk_destruct = NULL;
b0691c8e 1529 bh_unlock_sock(newsk);
87d11ceb
ACM		 1530 sk_free(newsk);
1531 newsk = NULL;
1532 goto out;
1533 }
fa463497 1534 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
87d11ceb
ACM		 1535
1536 newsk->sk_err = 0;
1537 newsk->sk_priority = 0;
2c8c56e1 1538 newsk->sk_incoming_cpu = raw_smp_processor_id();
33cf7c90 1539 atomic64_set(&newsk->sk_cookie, 0);
4dc6dc71
ED		 1540 /*
1541 * Before updating sk_refcnt, we must commit prior changes to memory
1542 * (Documentation/RCU/rculist_nulls.txt for details)
1543 */
1544 smp_wmb();
87d11ceb
ACM		 1545 atomic_set(&newsk->sk_refcnt, 2);
1546
1547 /*
1548 * Increment the counter in the same struct proto as the master
1549 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1550 * is the same as sk->sk_prot->socks, as this field was copied
1551 * with memcpy).
1552 *
1553 * This _changes_ the previous behaviour, where
1554 * tcp_create_openreq_child always was incrementing the
1555 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1556 * to be taken into account in all callers. -acme
1557 */
1558 sk_refcnt_debug_inc(newsk);
972692e0 1559 sk_set_socket(newsk, NULL);
43815482 1560 newsk->sk_wq = NULL;
87d11ceb 1561
baac50bb 1562 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
3d596f7b 1563 sock_update_memcg(newsk);
f3f511e1 1564
87d11ceb 1565 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1566 sk_sockets_allocated_inc(newsk);
704da560 1567
080a270f
HFS		 1568 if (sock_needs_netstamp(sk) &&
1569 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1570 net_enable_timestamp();
87d11ceb
ACM		 1571 }
1572out:
1573 return newsk;
1574}
e56c57d0 1575EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1576
9958089a
AK		 1577void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1578{
d6a4e26a
ED		 1579 u32 max_segs = 1;
1580
6bd4f355 1581 sk_dst_set(sk, dst);
9958089a
AK		 1582 sk->sk_route_caps = dst->dev->features;
1583 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1584 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1585 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1586 if (sk_can_gso(sk)) {
82cc1a7a 1587 if (dst->header_len) {
9958089a 1588 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1589 } else {
9958089a 1590 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1591 sk->sk_gso_max_size = dst->dev->gso_max_size;
d6a4e26a 1592 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
82cc1a7a 1593 }
9958089a 1594 }
d6a4e26a 1595 sk->sk_gso_max_segs = max_segs;
9958089a
AK		 1596}
1597EXPORT_SYMBOL_GPL(sk_setup_caps);
1598
1da177e4
LT		 1599/*
1600 * Simple resource managers for sockets.
1601 */
1602
1603
4ec93edb
YH		 1604/*
1605 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1606 */
1607void sock_wfree(struct sk_buff *skb)
1608{
1609 struct sock *sk = skb->sk;
d99927f4 1610 unsigned int len = skb->truesize;
1da177e4 1611
d99927f4
ED		 1612 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1613 /*
1614 * Keep a reference on sk_wmem_alloc, this will be released
1615 * after sk_write_space() call
1616 */
1617 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1618 sk->sk_write_space(sk);
d99927f4
ED		 1619 len = 1;
1620 }
2b85a34e 1621 /*
d99927f4
ED		 1622 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1623 * could not do because of in-flight packets
2b85a34e 1624 */
d99927f4 1625 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1626 __sk_free(sk);
1da177e4 1627}
2a91525c 1628EXPORT_SYMBOL(sock_wfree);
1da177e4 1629
9e17f8a4
ED		 1630void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1631{
1632 skb_orphan(skb);
1633 skb->sk = sk;
1634#ifdef CONFIG_INET
1635 if (unlikely(!sk_fullsock(sk))) {
1636 skb->destructor = sock_edemux;
1637 sock_hold(sk);
1638 return;
1639 }
1640#endif
1641 skb->destructor = sock_wfree;
1642 skb_set_hash_from_sk(skb, sk);
1643 /*
1644 * We used to take a refcount on sk, but following operation
1645 * is enough to guarantee sk_free() wont free this sock until
1646 * all in-flight packets are completed
1647 */
1648 atomic_add(skb->truesize, &sk->sk_wmem_alloc);
1649}
1650EXPORT_SYMBOL(skb_set_owner_w);
1651
f2f872f9
ED		 1652void skb_orphan_partial(struct sk_buff *skb)
1653{
1654 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1655 * so we do not completely orphan skb, but transfert all
1656 * accounted bytes but one, to avoid unexpected reorders.
1657 */
1658 if (skb->destructor == sock_wfree
1659#ifdef CONFIG_INET
1660 || skb->destructor == tcp_wfree
1661#endif
1662 ) {
1663 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1664 skb->truesize = 1;
1665 } else {
1666 skb_orphan(skb);
1667 }
1668}
1669EXPORT_SYMBOL(skb_orphan_partial);
1670
4ec93edb
YH		 1671/*
1672 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1673 */
1674void sock_rfree(struct sk_buff *skb)
1675{
1676 struct sock *sk = skb->sk;
d361fd59 1677 unsigned int len = skb->truesize;
1da177e4 1678
d361fd59
ED		 1679 atomic_sub(len, &sk->sk_rmem_alloc);
1680 sk_mem_uncharge(sk, len);
1da177e4 1681}
2a91525c 1682EXPORT_SYMBOL(sock_rfree);
1da177e4 1683
7768eed8
OH		 1684/*
1685 * Buffer destructor for skbs that are not used directly in read or write
1686 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1687 */
62bccb8c
AD		 1688void sock_efree(struct sk_buff *skb)
1689{
1690 sock_put(skb->sk);
1691}
1692EXPORT_SYMBOL(sock_efree);
1693
976d0201 1694kuid_t sock_i_uid(struct sock *sk)
1da177e4 1695{
976d0201 1696 kuid_t uid;
1da177e4 1697
f064af1e 1698 read_lock_bh(&sk->sk_callback_lock);
976d0201 1699 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1700 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1701 return uid;
1702}
2a91525c 1703EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1704
1705unsigned long sock_i_ino(struct sock *sk)
1706{
1707 unsigned long ino;
1708
f064af1e 1709 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1710 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1711 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1712 return ino;
1713}
2a91525c 1714EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1715
1716/*
1717 * Allocate a skb from the socket's send buffer.
1718 */
86a76caf 1719struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1720 gfp_t priority)
1da177e4
LT		 1721{
1722 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1723 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1724 if (skb) {
1725 skb_set_owner_w(skb, sk);
1726 return skb;
1727 }
1728 }
1729 return NULL;
1730}
2a91525c 1731EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1732
4ec93edb 1733/*
1da177e4 1734 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1735 */
dd0fc66f 1736void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1737{
95c96174 1738 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1739 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1740 void *mem;
1741 /* First do the add, to avoid the race if kmalloc
4ec93edb 1742 * might sleep.
1da177e4
LT		 1743 */
1744 atomic_add(size, &sk->sk_omem_alloc);
1745 mem = kmalloc(size, priority);
1746 if (mem)
1747 return mem;
1748 atomic_sub(size, &sk->sk_omem_alloc);
1749 }
1750 return NULL;
1751}
2a91525c 1752EXPORT_SYMBOL(sock_kmalloc);
1da177e4 1753
79e88659
DB		 1754/* Free an option memory block. Note, we actually want the inline
1755 * here as this allows gcc to detect the nullify and fold away the
1756 * condition entirely.
1da177e4 1757 */
79e88659
DB		 1758static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1759 const bool nullify)
1da177e4 1760{
e53da5fb
DM		 1761 if (WARN_ON_ONCE(!mem))
1762 return;
79e88659
DB		 1763 if (nullify)
1764 kzfree(mem);
1765 else
1766 kfree(mem);
1da177e4
LT		 1767 atomic_sub(size, &sk->sk_omem_alloc);
1768}
79e88659
DB		 1769
1770void sock_kfree_s(struct sock *sk, void *mem, int size)
1771{
1772 __sock_kfree_s(sk, mem, size, false);
1773}
2a91525c 1774EXPORT_SYMBOL(sock_kfree_s);
1da177e4 1775
79e88659
DB		 1776void sock_kzfree_s(struct sock *sk, void *mem, int size)
1777{
1778 __sock_kfree_s(sk, mem, size, true);
1779}
1780EXPORT_SYMBOL(sock_kzfree_s);
1781
1da177e4
LT		 1782/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1783 I think, these locks should be removed for datagram sockets.
1784 */
2a91525c 1785static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1786{
1787 DEFINE_WAIT(wait);
1788
9cd3e072 1789 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1da177e4
LT		 1790 for (;;) {
1791 if (!timeo)
1792 break;
1793 if (signal_pending(current))
1794 break;
1795 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1796 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1797 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1798 break;
1799 if (sk->sk_shutdown & SEND_SHUTDOWN)
1800 break;
1801 if (sk->sk_err)
1802 break;
1803 timeo = schedule_timeout(timeo);
1804 }
aa395145 1805 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1806 return timeo;
1807}
1808
1809
1810/*
1811 * Generic send/receive buffer handlers
1812 */
1813
4cc7f68d
HX		 1814struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1815 unsigned long data_len, int noblock,
28d64271 1816 int *errcode, int max_page_order)
1da177e4 1817{
2e4e4410 1818 struct sk_buff *skb;
1da177e4
LT		 1819 long timeo;
1820 int err;
1821
1da177e4 1822 timeo = sock_sndtimeo(sk, noblock);
2e4e4410 1823 for (;;) {
1da177e4
LT		 1824 err = sock_error(sk);
1825 if (err != 0)
1826 goto failure;
1827
1828 err = -EPIPE;
1829 if (sk->sk_shutdown & SEND_SHUTDOWN)
1830 goto failure;
1831
2e4e4410
ED		 1832 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
1833 break;
28d64271 1834
9cd3e072 1835 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2e4e4410
ED		 1836 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1837 err = -EAGAIN;
1838 if (!timeo)
1da177e4 1839 goto failure;
2e4e4410
ED		 1840 if (signal_pending(current))
1841 goto interrupted;
1842 timeo = sock_wait_for_wmem(sk, timeo);
1da177e4 1843 }
2e4e4410
ED		 1844 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
1845 errcode, sk->sk_allocation);
1846 if (skb)
1847 skb_set_owner_w(skb, sk);
1da177e4
LT		 1848 return skb;
1849
1850interrupted:
1851 err = sock_intr_errno(timeo);
1852failure:
1853 *errcode = err;
1854 return NULL;
1855}
4cc7f68d 1856EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1857
4ec93edb 1858struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1859 int noblock, int *errcode)
1860{
28d64271 1861 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1862}
2a91525c 1863EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1864
f28ea365
EJ		 1865int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
1866 struct sockcm_cookie *sockc)
1867{
1868 struct cmsghdr *cmsg;
1869
1870 for_each_cmsghdr(cmsg, msg) {
1871 if (!CMSG_OK(msg, cmsg))
1872 return -EINVAL;
1873 if (cmsg->cmsg_level != SOL_SOCKET)
1874 continue;
1875 switch (cmsg->cmsg_type) {
1876 case SO_MARK:
1877 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1878 return -EPERM;
1879 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
1880 return -EINVAL;
1881 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
1882 break;
1883 default:
1884 return -EINVAL;
1885 }
1886 }
1887 return 0;
1888}
1889EXPORT_SYMBOL(sock_cmsg_send);
1890
5640f768
ED		 1891/* On 32bit arches, an skb frag is limited to 2^15 */
1892#define SKB_FRAG_PAGE_ORDER get_order(32768)
1893
400dfd3a
ED		 1894/**
1895 * skb_page_frag_refill - check that a page_frag contains enough room
1896 * @sz: minimum size of the fragment we want to get
1897 * @pfrag: pointer to page_frag
82d5e2b8 1898 * @gfp: priority for memory allocation
400dfd3a
ED		 1899 *
1900 * Note: While this allocator tries to use high order pages, there is
1901 * no guarantee that allocations succeed. Therefore, @sz MUST be
1902 * less or equal than PAGE_SIZE.
1903 */
d9b2938a 1904bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 1905{
5640f768
ED		 1906 if (pfrag->page) {
1907 if (atomic_read(&pfrag->page->_count) == 1) {
1908 pfrag->offset = 0;
1909 return true;
1910 }
400dfd3a 1911 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1912 return true;
1913 put_page(pfrag->page);
1914 }
1915
d9b2938a
ED		 1916 pfrag->offset = 0;
1917 if (SKB_FRAG_PAGE_ORDER) {
d0164adc
MG		 1918 /* Avoid direct reclaim but allow kswapd to wake */
1919 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
1920 __GFP_COMP | __GFP_NOWARN |
1921 __GFP_NORETRY,
d9b2938a 1922 SKB_FRAG_PAGE_ORDER);
5640f768 1923 if (likely(pfrag->page)) {
d9b2938a 1924 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 1925 return true;
1926 }
d9b2938a
ED		 1927 }
1928 pfrag->page = alloc_page(gfp);
1929 if (likely(pfrag->page)) {
1930 pfrag->size = PAGE_SIZE;
1931 return true;
1932 }
400dfd3a
ED		 1933 return false;
1934}
1935EXPORT_SYMBOL(skb_page_frag_refill);
1936
1937bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1938{
1939 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1940 return true;
1941
5640f768
ED		 1942 sk_enter_memory_pressure(sk);
1943 sk_stream_moderate_sndbuf(sk);
1944 return false;
1945}
1946EXPORT_SYMBOL(sk_page_frag_refill);
1947
1da177e4 1948static void __lock_sock(struct sock *sk)
f39234d6
NK		 1949 __releases(&sk->sk_lock.slock)
1950 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1951{
1952 DEFINE_WAIT(wait);
1953
e71a4783 1954 for (;;) {
1da177e4
LT		 1955 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1956 TASK_UNINTERRUPTIBLE);
1957 spin_unlock_bh(&sk->sk_lock.slock);
1958 schedule();
1959 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1960 if (!sock_owned_by_user(sk))
1da177e4
LT		 1961 break;
1962 }
1963 finish_wait(&sk->sk_lock.wq, &wait);
1964}
1965
1966static void __release_sock(struct sock *sk)
f39234d6
NK		 1967 __releases(&sk->sk_lock.slock)
1968 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1969{
1970 struct sk_buff *skb = sk->sk_backlog.head;
1971
1972 do {
1973 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1974 bh_unlock_sock(sk);
1975
1976 do {
1977 struct sk_buff *next = skb->next;
1978
e4cbb02a 1979 prefetch(next);
7fee226a 1980 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1981 skb->next = NULL;
c57943a1 1982 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1983
1984 /*
1985 * We are in process context here with softirqs
1986 * disabled, use cond_resched_softirq() to preempt.
1987 * This is safe to do because we've taken the backlog
1988 * queue private:
1989 */
1990 cond_resched_softirq();
1991
1992 skb = next;
1993 } while (skb != NULL);
1994
1995 bh_lock_sock(sk);
e71a4783 1996 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1997
1998 /*
1999 * Doing the zeroing here guarantee we can not loop forever
2000 * while a wild producer attempts to flood us.
2001 */
2002 sk->sk_backlog.len = 0;
1da177e4
LT		 2003}
2004
2005/**
2006 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 2007 * @sk: sock to wait on
2008 * @timeo: for how long
dfbafc99 2009 * @skb: last skb seen on sk_receive_queue
1da177e4
LT		 2010 *
2011 * Now socket state including sk->sk_err is changed only under lock,
2012 * hence we may omit checks after joining wait queue.
2013 * We check receive queue before schedule() only as optimization;
2014 * it is very likely that release_sock() added new data.
2015 */
dfbafc99 2016int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
1da177e4
LT		 2017{
2018 int rc;
2019 DEFINE_WAIT(wait);
2020
aa395145 2021 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9cd3e072 2022 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
dfbafc99 2023 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb);
9cd3e072 2024 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
aa395145 2025 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 2026 return rc;
2027}
1da177e4
LT		 2028EXPORT_SYMBOL(sk_wait_data);
2029
3ab224be
HA		 2030/**
2031 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2032 * @sk: socket
2033 * @size: memory size to allocate
2034 * @kind: allocation type
2035 *
2036 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2037 * rmem allocation. This function assumes that protocols which have
2038 * memory_pressure use sk_wmem_queued as write buffer accounting.
2039 */
2040int __sk_mem_schedule(struct sock *sk, int size, int kind)
2041{
2042 struct proto *prot = sk->sk_prot;
2043 int amt = sk_mem_pages(size);
8d987e5c 2044 long allocated;
3ab224be
HA		 2045
2046 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 2047
e805605c
JW		 2048 allocated = sk_memory_allocated_add(sk, amt);
2049
baac50bb
JW		 2050 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2051 !mem_cgroup_charge_skmem(sk->sk_memcg, amt))
e805605c 2052 goto suppress_allocation;
3ab224be
HA		 2053
2054 /* Under limit. */
e805605c 2055 if (allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2056 sk_leave_memory_pressure(sk);
3ab224be
HA		 2057 return 1;
2058 }
2059
e805605c
JW		 2060 /* Under pressure. */
2061 if (allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2062 sk_enter_memory_pressure(sk);
3ab224be 2063
e805605c
JW		 2064 /* Over hard limit. */
2065 if (allocated > sk_prot_mem_limits(sk, 2))
3ab224be
HA		 2066 goto suppress_allocation;
2067
2068 /* guarantee minimum buffer size under pressure */
2069 if (kind == SK_MEM_RECV) {
2070 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2071 return 1;
180d8cd9 2072
3ab224be
HA		 2073 } else { /* SK_MEM_SEND */
2074 if (sk->sk_type == SOCK_STREAM) {
2075 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2076 return 1;
2077 } else if (atomic_read(&sk->sk_wmem_alloc) <
2078 prot->sysctl_wmem[0])
2079 return 1;
2080 }
2081
180d8cd9 2082 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2083 int alloc;
2084
180d8cd9 2085 if (!sk_under_memory_pressure(sk))
1748376b 2086 return 1;
180d8cd9
GC		 2087 alloc = sk_sockets_allocated_read_positive(sk);
2088 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2089 sk_mem_pages(sk->sk_wmem_queued +
2090 atomic_read(&sk->sk_rmem_alloc) +
2091 sk->sk_forward_alloc))
2092 return 1;
2093 }
2094
2095suppress_allocation:
2096
2097 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2098 sk_stream_moderate_sndbuf(sk);
2099
2100 /* Fail only if socket is _under_ its sndbuf.
2101 * In this case we cannot block, so that we have to fail.
2102 */
2103 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2104 return 1;
2105 }
2106
3847ce32
SM		 2107 trace_sock_exceed_buf_limit(sk, prot, allocated);
2108
3ab224be
HA		 2109 /* Alas. Undo changes. */
2110 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2111
0e90b31f 2112 sk_memory_allocated_sub(sk, amt);
180d8cd9 2113
baac50bb
JW		 2114 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2115 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
e805605c 2116
3ab224be
HA		 2117 return 0;
2118}
3ab224be
HA		 2119EXPORT_SYMBOL(__sk_mem_schedule);
2120
2121/**
69dba9bb 2122 * __sk_mem_reclaim - reclaim memory_allocated
3ab224be 2123 * @sk: socket
1a24e04e 2124 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
3ab224be 2125 */
1a24e04e 2126void __sk_mem_reclaim(struct sock *sk, int amount)
3ab224be 2127{
1a24e04e
ED		 2128 amount >>= SK_MEM_QUANTUM_SHIFT;
2129 sk_memory_allocated_sub(sk, amount);
2130 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
3ab224be 2131
baac50bb
JW		 2132 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2133 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
e805605c 2134
180d8cd9
GC		 2135 if (sk_under_memory_pressure(sk) &&
2136 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2137 sk_leave_memory_pressure(sk);
3ab224be 2138}
3ab224be
HA		 2139EXPORT_SYMBOL(__sk_mem_reclaim);
2140
2141
1da177e4
LT		 2142/*
2143 * Set of default routines for initialising struct proto_ops when
2144 * the protocol does not support a particular function. In certain
2145 * cases where it makes no sense for a protocol to have a "do nothing"
2146 * function, some default processing is provided.
2147 */
2148
2149int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2150{
2151 return -EOPNOTSUPP;
2152}
2a91525c 2153EXPORT_SYMBOL(sock_no_bind);
1da177e4 2154
4ec93edb 2155int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2156 int len, int flags)
2157{
2158 return -EOPNOTSUPP;
2159}
2a91525c 2160EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2161
2162int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2163{
2164 return -EOPNOTSUPP;
2165}
2a91525c 2166EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2167
2168int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2169{
2170 return -EOPNOTSUPP;
2171}
2a91525c 2172EXPORT_SYMBOL(sock_no_accept);
1da177e4 2173
4ec93edb 2174int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2175 int *len, int peer)
2176{
2177 return -EOPNOTSUPP;
2178}
2a91525c 2179EXPORT_SYMBOL(sock_no_getname);
1da177e4 2180
2a91525c 2181unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2182{
2183 return 0;
2184}
2a91525c 2185EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2186
2187int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2188{
2189 return -EOPNOTSUPP;
2190}
2a91525c 2191EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2192
2193int sock_no_listen(struct socket *sock, int backlog)
2194{
2195 return -EOPNOTSUPP;
2196}
2a91525c 2197EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2198
2199int sock_no_shutdown(struct socket *sock, int how)
2200{
2201 return -EOPNOTSUPP;
2202}
2a91525c 2203EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2204
2205int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2206 char __user *optval, unsigned int optlen)
1da177e4
LT		 2207{
2208 return -EOPNOTSUPP;
2209}
2a91525c 2210EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2211
2212int sock_no_getsockopt(struct socket *sock, int level, int optname,
2213 char __user *optval, int __user *optlen)
2214{
2215 return -EOPNOTSUPP;
2216}
2a91525c 2217EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4 2218
1b784140 2219int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
1da177e4
LT		 2220{
2221 return -EOPNOTSUPP;
2222}
2a91525c 2223EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4 2224
1b784140
YX		 2225int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2226 int flags)
1da177e4
LT		 2227{
2228 return -EOPNOTSUPP;
2229}
2a91525c 2230EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2231
2232int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2233{
2234 /* Mirror missing mmap method error code */
2235 return -ENODEV;
2236}
2a91525c 2237EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2238
2239ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2240{
2241 ssize_t res;
2242 struct msghdr msg = {.msg_flags = flags};
2243 struct kvec iov;
2244 char *kaddr = kmap(page);
2245 iov.iov_base = kaddr + offset;
2246 iov.iov_len = size;
2247 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2248 kunmap(page);
2249 return res;
2250}
2a91525c 2251EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2252
2253/*
2254 * Default Socket Callbacks
2255 */
2256
2257static void sock_def_wakeup(struct sock *sk)
2258{
43815482
ED		 2259 struct socket_wq *wq;
2260
2261 rcu_read_lock();
2262 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2263 if (skwq_has_sleeper(wq))
43815482
ED		 2264 wake_up_interruptible_all(&wq->wait);
2265 rcu_read_unlock();
1da177e4
LT		 2266}
2267
2268static void sock_def_error_report(struct sock *sk)
2269{
43815482
ED		 2270 struct socket_wq *wq;
2271
2272 rcu_read_lock();
2273 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2274 if (skwq_has_sleeper(wq))
43815482 2275 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2276 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2277 rcu_read_unlock();
1da177e4
LT		 2278}
2279
676d2369 2280static void sock_def_readable(struct sock *sk)
1da177e4 2281{
43815482
ED		 2282 struct socket_wq *wq;
2283
2284 rcu_read_lock();
2285 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2286 if (skwq_has_sleeper(wq))
2c6607c6 2287 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2288 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2289 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2290 rcu_read_unlock();
1da177e4
LT		 2291}
2292
2293static void sock_def_write_space(struct sock *sk)
2294{
43815482
ED		 2295 struct socket_wq *wq;
2296
2297 rcu_read_lock();
1da177e4
LT		 2298
2299 /* Do not wake up a writer until he can make "significant"
2300 * progress. --DaveM
2301 */
e71a4783 2302 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482 2303 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2304 if (skwq_has_sleeper(wq))
43815482 2305 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2306 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2307
2308 /* Should agree with poll, otherwise some programs break */
2309 if (sock_writeable(sk))
8d8ad9d7 2310 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2311 }
2312
43815482 2313 rcu_read_unlock();
1da177e4
LT		 2314}
2315
2316static void sock_def_destruct(struct sock *sk)
2317{
1da177e4
LT		 2318}
2319
2320void sk_send_sigurg(struct sock *sk)
2321{
2322 if (sk->sk_socket && sk->sk_socket->file)
2323 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2324 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2325}
2a91525c 2326EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2327
2328void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2329 unsigned long expires)
2330{
2331 if (!mod_timer(timer, expires))
2332 sock_hold(sk);
2333}
1da177e4
LT		 2334EXPORT_SYMBOL(sk_reset_timer);
2335
2336void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2337{
25cc4ae9 2338 if (del_timer(timer))
1da177e4
LT		 2339 __sock_put(sk);
2340}
1da177e4
LT		 2341EXPORT_SYMBOL(sk_stop_timer);
2342
2343void sock_init_data(struct socket *sock, struct sock *sk)
2344{
2345 skb_queue_head_init(&sk->sk_receive_queue);
2346 skb_queue_head_init(&sk->sk_write_queue);
2347 skb_queue_head_init(&sk->sk_error_queue);
2348
2349 sk->sk_send_head = NULL;
2350
2351 init_timer(&sk->sk_timer);
4ec93edb 2352
1da177e4
LT		 2353 sk->sk_allocation = GFP_KERNEL;
2354 sk->sk_rcvbuf = sysctl_rmem_default;
2355 sk->sk_sndbuf = sysctl_wmem_default;
2356 sk->sk_state = TCP_CLOSE;
972692e0 2357 sk_set_socket(sk, sock);
1da177e4
LT		 2358
2359 sock_set_flag(sk, SOCK_ZAPPED);
2360
e71a4783 2361 if (sock) {
1da177e4 2362 sk->sk_type = sock->type;
43815482 2363 sk->sk_wq = sock->wq;
1da177e4
LT		 2364 sock->sk = sk;
2365 } else
43815482 2366 sk->sk_wq = NULL;
1da177e4 2367
1da177e4 2368 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2369 lockdep_set_class_and_name(&sk->sk_callback_lock,
2370 af_callback_keys + sk->sk_family,
2371 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2372
2373 sk->sk_state_change = sock_def_wakeup;
2374 sk->sk_data_ready = sock_def_readable;
2375 sk->sk_write_space = sock_def_write_space;
2376 sk->sk_error_report = sock_def_error_report;
2377 sk->sk_destruct = sock_def_destruct;
2378
5640f768
ED		 2379 sk->sk_frag.page = NULL;
2380 sk->sk_frag.offset = 0;
ef64a54f 2381 sk->sk_peek_off = -1;
1da177e4 2382
109f6e39
EB		 2383 sk->sk_peer_pid = NULL;
2384 sk->sk_peer_cred = NULL;
1da177e4
LT		 2385 sk->sk_write_pending = 0;
2386 sk->sk_rcvlowat = 1;
2387 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2388 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2389
f37f0afb 2390 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2391
e0d1095a 2392#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2393 sk->sk_napi_id = 0;
64b0dc51 2394 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2395#endif
2396
62748f32 2397 sk->sk_max_pacing_rate = ~0U;
7eec4174 2398 sk->sk_pacing_rate = ~0U;
70da268b 2399 sk->sk_incoming_cpu = -1;
4dc6dc71
ED		 2400 /*
2401 * Before updating sk_refcnt, we must commit prior changes to memory
2402 * (Documentation/RCU/rculist_nulls.txt for details)
2403 */
2404 smp_wmb();
1da177e4 2405 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2406 atomic_set(&sk->sk_drops, 0);
1da177e4 2407}
2a91525c 2408EXPORT_SYMBOL(sock_init_data);
1da177e4 2409
b5606c2d 2410void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2411{
2412 might_sleep();
a5b5bb9a 2413 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2414 if (sk->sk_lock.owned)
1da177e4 2415 __lock_sock(sk);
d2e9117c 2416 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2417 spin_unlock(&sk->sk_lock.slock);
2418 /*
2419 * The sk_lock has mutex_lock() semantics here:
2420 */
fcc70d5f 2421 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2422 local_bh_enable();
1da177e4 2423}
fcc70d5f 2424EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2425
b5606c2d 2426void release_sock(struct sock *sk)
1da177e4 2427{
a5b5bb9a
IM		 2428 /*
2429 * The sk_lock has mutex_unlock() semantics:
2430 */
2431 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2432
2433 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2434 if (sk->sk_backlog.tail)
2435 __release_sock(sk);
46d3ceab 2436
c3f9b018
ED		 2437 /* Warning : release_cb() might need to release sk ownership,
2438 * ie call sock_release_ownership(sk) before us.
2439 */
46d3ceab
ED		 2440 if (sk->sk_prot->release_cb)
2441 sk->sk_prot->release_cb(sk);
2442
c3f9b018 2443 sock_release_ownership(sk);
a5b5bb9a
IM		 2444 if (waitqueue_active(&sk->sk_lock.wq))
2445 wake_up(&sk->sk_lock.wq);
2446 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2447}
2448EXPORT_SYMBOL(release_sock);
2449
8a74ad60
ED		 2450/**
2451 * lock_sock_fast - fast version of lock_sock
2452 * @sk: socket
2453 *
2454 * This version should be used for very small section, where process wont block
2455 * return false if fast path is taken
2456 * sk_lock.slock locked, owned = 0, BH disabled
2457 * return true if slow path is taken
2458 * sk_lock.slock unlocked, owned = 1, BH enabled
2459 */
2460bool lock_sock_fast(struct sock *sk)
2461{
2462 might_sleep();
2463 spin_lock_bh(&sk->sk_lock.slock);
2464
2465 if (!sk->sk_lock.owned)
2466 /*
2467 * Note : We must disable BH
2468 */
2469 return false;
2470
2471 __lock_sock(sk);
2472 sk->sk_lock.owned = 1;
2473 spin_unlock(&sk->sk_lock.slock);
2474 /*
2475 * The sk_lock has mutex_lock() semantics here:
2476 */
2477 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2478 local_bh_enable();
2479 return true;
2480}
2481EXPORT_SYMBOL(lock_sock_fast);
2482
1da177e4 2483int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2484{
b7aa0bf7 2485 struct timeval tv;
1da177e4 2486 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2487 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2488 tv = ktime_to_timeval(sk->sk_stamp);
2489 if (tv.tv_sec == -1)
1da177e4 2490 return -ENOENT;
b7aa0bf7
ED		 2491 if (tv.tv_sec == 0) {
2492 sk->sk_stamp = ktime_get_real();
2493 tv = ktime_to_timeval(sk->sk_stamp);
2494 }
2495 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2496}
1da177e4
LT		 2497EXPORT_SYMBOL(sock_get_timestamp);
2498
ae40eb1e
ED		 2499int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2500{
2501 struct timespec ts;
2502 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2503 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2504 ts = ktime_to_timespec(sk->sk_stamp);
2505 if (ts.tv_sec == -1)
2506 return -ENOENT;
2507 if (ts.tv_sec == 0) {
2508 sk->sk_stamp = ktime_get_real();
2509 ts = ktime_to_timespec(sk->sk_stamp);
2510 }
2511 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2512}
2513EXPORT_SYMBOL(sock_get_timestampns);
2514
20d49473 2515void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2516{
20d49473 2517 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2518 unsigned long previous_flags = sk->sk_flags;
2519
20d49473
PO		 2520 sock_set_flag(sk, flag);
2521 /*
2522 * we just set one of the two flags which require net
2523 * time stamping, but time stamping might have been on
2524 * already because of the other one
2525 */
080a270f
HFS		 2526 if (sock_needs_netstamp(sk) &&
2527 !(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2528 net_enable_timestamp();
1da177e4
LT		 2529 }
2530}
1da177e4 2531
cb820f8e
RC		 2532int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2533 int level, int type)
2534{
2535 struct sock_exterr_skb *serr;
364a9e93 2536 struct sk_buff *skb;
cb820f8e
RC		 2537 int copied, err;
2538
2539 err = -EAGAIN;
364a9e93 2540 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 2541 if (skb == NULL)
2542 goto out;
2543
2544 copied = skb->len;
2545 if (copied > len) {
2546 msg->msg_flags |= MSG_TRUNC;
2547 copied = len;
2548 }
51f3d02b 2549 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 2550 if (err)
2551 goto out_free_skb;
2552
2553 sock_recv_timestamp(msg, sk, skb);
2554
2555 serr = SKB_EXT_ERR(skb);
2556 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2557
2558 msg->msg_flags |= MSG_ERRQUEUE;
2559 err = copied;
2560
cb820f8e
RC		 2561out_free_skb:
2562 kfree_skb(skb);
2563out:
2564 return err;
2565}
2566EXPORT_SYMBOL(sock_recv_errqueue);
2567
1da177e4
LT		 2568/*
2569 * Get a socket option on an socket.
2570 *
2571 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2572 * asynchronous errors should be reported by getsockopt. We assume
2573 * this means if you specify SO_ERROR (otherwise whats the point of it).
2574 */
2575int sock_common_getsockopt(struct socket *sock, int level, int optname,
2576 char __user *optval, int __user *optlen)
2577{
2578 struct sock *sk = sock->sk;
2579
2580 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2581}
1da177e4
LT		 2582EXPORT_SYMBOL(sock_common_getsockopt);
2583
3fdadf7d 2584#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2585int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2586 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2587{
2588 struct sock *sk = sock->sk;
2589
1e51f951 2590 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2591 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2592 optval, optlen);
3fdadf7d
DM		 2593 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2594}
2595EXPORT_SYMBOL(compat_sock_common_getsockopt);
2596#endif
2597
1b784140
YX		 2598int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2599 int flags)
1da177e4
LT		 2600{
2601 struct sock *sk = sock->sk;
2602 int addr_len = 0;
2603 int err;
2604
1b784140 2605 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
1da177e4
LT		 2606 flags & ~MSG_DONTWAIT, &addr_len);
2607 if (err >= 0)
2608 msg->msg_namelen = addr_len;
2609 return err;
2610}
1da177e4
LT		 2611EXPORT_SYMBOL(sock_common_recvmsg);
2612
2613/*
2614 * Set socket options on an inet socket.
2615 */
2616int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2617 char __user *optval, unsigned int optlen)
1da177e4
LT		 2618{
2619 struct sock *sk = sock->sk;
2620
2621 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2622}
1da177e4
LT		 2623EXPORT_SYMBOL(sock_common_setsockopt);
2624
3fdadf7d 2625#ifdef CONFIG_COMPAT
543d9cfe 2626int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2627 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2628{
2629 struct sock *sk = sock->sk;
2630
543d9cfe
ACM		 2631 if (sk->sk_prot->compat_setsockopt != NULL)
2632 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2633 optval, optlen);
3fdadf7d
DM		 2634 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2635}
2636EXPORT_SYMBOL(compat_sock_common_setsockopt);
2637#endif
2638
1da177e4
LT		 2639void sk_common_release(struct sock *sk)
2640{
2641 if (sk->sk_prot->destroy)
2642 sk->sk_prot->destroy(sk);
2643
2644 /*
2645 * Observation: when sock_common_release is called, processes have
2646 * no access to socket. But net still has.
2647 * Step one, detach it from networking:
2648 *
2649 * A. Remove from hash tables.
2650 */
2651
2652 sk->sk_prot->unhash(sk);
2653
2654 /*
2655 * In this point socket cannot receive new packets, but it is possible
2656 * that some packets are in flight because some CPU runs receiver and
2657 * did hash table lookup before we unhashed socket. They will achieve
2658 * receive queue and will be purged by socket destructor.
2659 *
2660 * Also we still have packets pending on receive queue and probably,
2661 * our own packets waiting in device queues. sock_destroy will drain
2662 * receive queue, but transmitted packets will delay socket destruction
2663 * until the last reference will be released.
2664 */
2665
2666 sock_orphan(sk);
2667
2668 xfrm_sk_free_policy(sk);
2669
e6848976 2670 sk_refcnt_debug_release(sk);
5640f768
ED		 2671
2672 if (sk->sk_frag.page) {
2673 put_page(sk->sk_frag.page);
2674 sk->sk_frag.page = NULL;
2675 }
2676
1da177e4
LT		 2677 sock_put(sk);
2678}
1da177e4
LT		 2679EXPORT_SYMBOL(sk_common_release);
2680
13ff3d6f
PE		 2681#ifdef CONFIG_PROC_FS
2682#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2683struct prot_inuse {
2684 int val[PROTO_INUSE_NR];
2685};
13ff3d6f
PE		 2686
2687static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2688
2689#ifdef CONFIG_NET_NS
2690void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2691{
d6d9ca0f 2692 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2693}
2694EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2695
2696int sock_prot_inuse_get(struct net *net, struct proto *prot)
2697{
2698 int cpu, idx = prot->inuse_idx;
2699 int res = 0;
2700
2701 for_each_possible_cpu(cpu)
2702 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2703
2704 return res >= 0 ? res : 0;
2705}
2706EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2707
2c8c1e72 2708static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2709{
2710 net->core.inuse = alloc_percpu(struct prot_inuse);
2711 return net->core.inuse ? 0 : -ENOMEM;
2712}
2713
2c8c1e72 2714static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2715{
2716 free_percpu(net->core.inuse);
2717}
2718
2719static struct pernet_operations net_inuse_ops = {
2720 .init = sock_inuse_init_net,
2721 .exit = sock_inuse_exit_net,
2722};
2723
2724static __init int net_inuse_init(void)
2725{
2726 if (register_pernet_subsys(&net_inuse_ops))
2727 panic("Cannot initialize net inuse counters");
2728
2729 return 0;
2730}
2731
2732core_initcall(net_inuse_init);
2733#else
1338d466
PE		 2734static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2735
c29a0bc4 2736void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2737{
d6d9ca0f 2738 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2739}
2740EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2741
c29a0bc4 2742int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2743{
2744 int cpu, idx = prot->inuse_idx;
2745 int res = 0;
2746
2747 for_each_possible_cpu(cpu)
2748 res += per_cpu(prot_inuse, cpu).val[idx];
2749
2750 return res >= 0 ? res : 0;
2751}
2752EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2753#endif
13ff3d6f
PE		 2754
2755static void assign_proto_idx(struct proto *prot)
2756{
2757 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2758
2759 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2760 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2761 return;
2762 }
2763
2764 set_bit(prot->inuse_idx, proto_inuse_idx);
2765}
2766
2767static void release_proto_idx(struct proto *prot)
2768{
2769 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2770 clear_bit(prot->inuse_idx, proto_inuse_idx);
2771}
2772#else
2773static inline void assign_proto_idx(struct proto *prot)
2774{
2775}
2776
2777static inline void release_proto_idx(struct proto *prot)
2778{
2779}
2780#endif
2781
0159dfd3
ED		 2782static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
2783{
2784 if (!rsk_prot)
2785 return;
2786 kfree(rsk_prot->slab_name);
2787 rsk_prot->slab_name = NULL;
adf78eda
JL		 2788 kmem_cache_destroy(rsk_prot->slab);
2789 rsk_prot->slab = NULL;
0159dfd3
ED		 2790}
2791
2792static int req_prot_init(const struct proto *prot)
2793{
2794 struct request_sock_ops *rsk_prot = prot->rsk_prot;
2795
2796 if (!rsk_prot)
2797 return 0;
2798
2799 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
2800 prot->name);
2801 if (!rsk_prot->slab_name)
2802 return -ENOMEM;
2803
2804 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
2805 rsk_prot->obj_size, 0,
e96f78ab 2806 prot->slab_flags, NULL);
0159dfd3
ED		 2807
2808 if (!rsk_prot->slab) {
2809 pr_crit("%s: Can't create request sock SLAB cache!\n",
2810 prot->name);
2811 return -ENOMEM;
2812 }
2813 return 0;
2814}
2815
b733c007
PE		 2816int proto_register(struct proto *prot, int alloc_slab)
2817{
1da177e4
LT		 2818 if (alloc_slab) {
2819 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2820 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2821 NULL);
1da177e4
LT		 2822
2823 if (prot->slab == NULL) {
e005d193
JP		 2824 pr_crit("%s: Can't create sock SLAB cache!\n",
2825 prot->name);
60e7663d 2826 goto out;
1da177e4 2827 }
2e6599cb 2828
0159dfd3
ED		 2829 if (req_prot_init(prot))
2830 goto out_free_request_sock_slab;
8feaf0c0 2831
6d6ee43e 2832 if (prot->twsk_prot != NULL) {
faf23422 2833 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2834
7e56b5d6 2835 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2836 goto out_free_request_sock_slab;
2837
6d6ee43e 2838 prot->twsk_prot->twsk_slab =
7e56b5d6 2839 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2840 prot->twsk_prot->twsk_obj_size,
3ab5aee7 2841 0,
52db70dc 2842 prot->slab_flags,
20c2df83 2843 NULL);
6d6ee43e 2844 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2845 goto out_free_timewait_sock_slab_name;
2846 }
1da177e4
LT		 2847 }
2848
36b77a52 2849 mutex_lock(&proto_list_mutex);
1da177e4 2850 list_add(&prot->node, &proto_list);
13ff3d6f 2851 assign_proto_idx(prot);
36b77a52 2852 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2853 return 0;
2854
8feaf0c0 2855out_free_timewait_sock_slab_name:
7e56b5d6 2856 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0 2857out_free_request_sock_slab:
0159dfd3
ED		 2858 req_prot_cleanup(prot->rsk_prot);
2859
2e6599cb
ACM		 2860 kmem_cache_destroy(prot->slab);
2861 prot->slab = NULL;
b733c007
PE		 2862out:
2863 return -ENOBUFS;
1da177e4 2864}
1da177e4
LT		 2865EXPORT_SYMBOL(proto_register);
2866
2867void proto_unregister(struct proto *prot)
2868{
36b77a52 2869 mutex_lock(&proto_list_mutex);
13ff3d6f 2870 release_proto_idx(prot);
0a3f4358 2871 list_del(&prot->node);
36b77a52 2872 mutex_unlock(&proto_list_mutex);
1da177e4 2873
adf78eda
JL		 2874 kmem_cache_destroy(prot->slab);
2875 prot->slab = NULL;
1da177e4 2876
0159dfd3 2877 req_prot_cleanup(prot->rsk_prot);
2e6599cb 2878
6d6ee43e 2879 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2880 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2881 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2882 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2883 }
1da177e4 2884}
1da177e4
LT		 2885EXPORT_SYMBOL(proto_unregister);
2886
2887#ifdef CONFIG_PROC_FS
1da177e4 2888static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2889 __acquires(proto_list_mutex)
1da177e4 2890{
36b77a52 2891 mutex_lock(&proto_list_mutex);
60f0438a 2892 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2893}
2894
2895static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2896{
60f0438a 2897 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2898}
2899
2900static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2901 __releases(proto_list_mutex)
1da177e4 2902{
36b77a52 2903 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2904}
2905
2906static char proto_method_implemented(const void *method)
2907{
2908 return method == NULL ? 'n' : 'y';
2909}
180d8cd9
GC		 2910static long sock_prot_memory_allocated(struct proto *proto)
2911{
cb75a36c 2912 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2913}
2914
2915static char *sock_prot_memory_pressure(struct proto *proto)
2916{
2917 return proto->memory_pressure != NULL ?
2918 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2919}
1da177e4
LT		 2920
2921static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2922{
180d8cd9 2923
8d987e5c 2924 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2925 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2926 proto->name,
2927 proto->obj_size,
14e943db 2928 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2929 sock_prot_memory_allocated(proto),
2930 sock_prot_memory_pressure(proto),
1da177e4
LT		 2931 proto->max_header,
2932 proto->slab == NULL ? "no" : "yes",
2933 module_name(proto->owner),
2934 proto_method_implemented(proto->close),
2935 proto_method_implemented(proto->connect),
2936 proto_method_implemented(proto->disconnect),
2937 proto_method_implemented(proto->accept),
2938 proto_method_implemented(proto->ioctl),
2939 proto_method_implemented(proto->init),
2940 proto_method_implemented(proto->destroy),
2941 proto_method_implemented(proto->shutdown),
2942 proto_method_implemented(proto->setsockopt),
2943 proto_method_implemented(proto->getsockopt),
2944 proto_method_implemented(proto->sendmsg),
2945 proto_method_implemented(proto->recvmsg),
2946 proto_method_implemented(proto->sendpage),
2947 proto_method_implemented(proto->bind),
2948 proto_method_implemented(proto->backlog_rcv),
2949 proto_method_implemented(proto->hash),
2950 proto_method_implemented(proto->unhash),
2951 proto_method_implemented(proto->get_port),
2952 proto_method_implemented(proto->enter_memory_pressure));
2953}
2954
2955static int proto_seq_show(struct seq_file *seq, void *v)
2956{
60f0438a 2957 if (v == &proto_list)
1da177e4
LT		 2958 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2959 "protocol",
2960 "size",
2961 "sockets",
2962 "memory",
2963 "press",
2964 "maxhdr",
2965 "slab",
2966 "module",
2967 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2968 else
60f0438a 2969 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2970 return 0;
2971}
2972
f690808e 2973static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2974 .start = proto_seq_start,
2975 .next = proto_seq_next,
2976 .stop = proto_seq_stop,
2977 .show = proto_seq_show,
2978};
2979
2980static int proto_seq_open(struct inode *inode, struct file *file)
2981{
14e943db
ED		 2982 return seq_open_net(inode, file, &proto_seq_ops,
2983 sizeof(struct seq_net_private));
1da177e4
LT		 2984}
2985
9a32144e 2986static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2987 .owner = THIS_MODULE,
2988 .open = proto_seq_open,
2989 .read = seq_read,
2990 .llseek = seq_lseek,
14e943db
ED		 2991 .release = seq_release_net,
2992};
2993
2994static __net_init int proto_init_net(struct net *net)
2995{
d4beaa66 2996 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 2997 return -ENOMEM;
2998
2999 return 0;
3000}
3001
3002static __net_exit void proto_exit_net(struct net *net)
3003{
ece31ffd 3004 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 3005}
3006
3007
3008static __net_initdata struct pernet_operations proto_net_ops = {
3009 .init = proto_init_net,
3010 .exit = proto_exit_net,
1da177e4
LT		 3011};
3012
3013static int __init proto_init(void)
3014{
14e943db 3015 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 3016}
3017
3018subsys_initcall(proto_init);
3019
3020#endif /* PROC_FS */
Linux kernel - Deliverables
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