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Merge branch 'for-4.6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...
[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" ,
0a1a37b6
DC		 224 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_KCM" ,
225 "sk_lock-AF_MAX"
a5b5bb9a 226};
36cbd3dc 227static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 228 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
229 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
230 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
231 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
232 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
233 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
234 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 235 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 236 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 237 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 238 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 239 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 240 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
0a1a37b6
DC		 241 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_KCM" ,
242 "slock-AF_MAX"
a5b5bb9a 243};
36cbd3dc 244static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 245 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
246 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
247 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
248 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
249 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
250 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
251 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 252 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 253 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 254 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 255 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 256 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 257 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
0a1a37b6
DC		 258 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_KCM" ,
259 "clock-AF_MAX"
443aef0e 260};
da21f24d
IM		 261
262/*
263 * sk_callback_lock locking rules are per-address-family,
264 * so split the lock classes by using a per-AF key:
265 */
266static struct lock_class_key af_callback_keys[AF_MAX];
267
1da177e4
LT		 268/* Take into consideration the size of the struct sk_buff overhead in the
269 * determination of these values, since that is non-constant across
270 * platforms. This makes socket queueing behavior and performance
271 * not depend upon such differences.
272 */
273#define _SK_MEM_PACKETS 256
87fb4b7b 274#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 275#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
276#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
277
278/* Run time adjustable parameters. */
ab32ea5d 279__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 280EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 281__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 282EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 283__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
284__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 285
25985edc 286/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 287int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 288EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 289
b245be1f
WB		 290int sysctl_tstamp_allow_data __read_mostly = 1;
291
c93bdd0e
MG		 292struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
293EXPORT_SYMBOL_GPL(memalloc_socks);
294
7cb02404
MG		 295/**
296 * sk_set_memalloc - sets %SOCK_MEMALLOC
297 * @sk: socket to set it on
298 *
299 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
300 * It's the responsibility of the admin to adjust min_free_kbytes
301 * to meet the requirements
302 */
303void sk_set_memalloc(struct sock *sk)
304{
305 sock_set_flag(sk, SOCK_MEMALLOC);
306 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 307 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 308}
309EXPORT_SYMBOL_GPL(sk_set_memalloc);
310
311void sk_clear_memalloc(struct sock *sk)
312{
313 sock_reset_flag(sk, SOCK_MEMALLOC);
314 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 315 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 316
317 /*
318 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
5d753610
MG		 319 * progress of swapping. SOCK_MEMALLOC may be cleared while
320 * it has rmem allocations due to the last swapfile being deactivated
321 * but there is a risk that the socket is unusable due to exceeding
322 * the rmem limits. Reclaim the reserves and obey rmem limits again.
c76562b6 323 */
5d753610 324 sk_mem_reclaim(sk);
7cb02404
MG		 325}
326EXPORT_SYMBOL_GPL(sk_clear_memalloc);
327
b4b9e355
MG		 328int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
329{
330 int ret;
331 unsigned long pflags = current->flags;
332
333 /* these should have been dropped before queueing */
334 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
335
336 current->flags |= PF_MEMALLOC;
337 ret = sk->sk_backlog_rcv(sk, skb);
338 tsk_restore_flags(current, pflags, PF_MEMALLOC);
339
340 return ret;
341}
342EXPORT_SYMBOL(__sk_backlog_rcv);
343
1da177e4
LT		 344static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
345{
346 struct timeval tv;
347
348 if (optlen < sizeof(tv))
349 return -EINVAL;
350 if (copy_from_user(&tv, optval, sizeof(tv)))
351 return -EFAULT;
ba78073e
VA		 352 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
353 return -EDOM;
1da177e4 354
ba78073e 355 if (tv.tv_sec < 0) {
6f11df83
AM		 356 static int warned __read_mostly;
357
ba78073e 358 *timeo_p = 0;
50aab54f 359 if (warned < 10 && net_ratelimit()) {
ba78073e 360 warned++;
e005d193
JP		 361 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
362 __func__, current->comm, task_pid_nr(current));
50aab54f 363 }
ba78073e
VA		 364 return 0;
365 }
1da177e4
LT		 366 *timeo_p = MAX_SCHEDULE_TIMEOUT;
367 if (tv.tv_sec == 0 && tv.tv_usec == 0)
368 return 0;
369 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
370 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
371 return 0;
372}
373
374static void sock_warn_obsolete_bsdism(const char *name)
375{
376 static int warned;
377 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 378 if (strcmp(warncomm, current->comm) && warned < 5) {
379 strcpy(warncomm, current->comm);
e005d193
JP		 380 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
381 warncomm, name);
1da177e4
LT		 382 warned++;
383 }
384}
385
080a270f
HFS		 386static bool sock_needs_netstamp(const struct sock *sk)
387{
388 switch (sk->sk_family) {
389 case AF_UNSPEC:
390 case AF_UNIX:
391 return false;
392 default:
393 return true;
394 }
395}
396
08e29af3 397static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 398{
08e29af3
ED		 399 if (sk->sk_flags & flags) {
400 sk->sk_flags &= ~flags;
080a270f
HFS		 401 if (sock_needs_netstamp(sk) &&
402 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 403 net_disable_timestamp();
1da177e4
LT		 404 }
405}
406
407
f0088a50
DV		 408int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
409{
766e9037 410 int err;
3b885787
NH		 411 unsigned long flags;
412 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 413
0fd7bac6 414 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 415 atomic_inc(&sk->sk_drops);
3847ce32 416 trace_sock_rcvqueue_full(sk, skb);
766e9037 417 return -ENOMEM;
f0088a50
DV		 418 }
419
fda9ef5d 420 err = sk_filter(sk, skb);
f0088a50 421 if (err)
766e9037 422 return err;
f0088a50 423
c76562b6 424 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 425 atomic_inc(&sk->sk_drops);
426 return -ENOBUFS;
3ab224be
HA		 427 }
428
f0088a50
DV		 429 skb->dev = NULL;
430 skb_set_owner_r(skb, sk);
49ad9599 431
7fee226a
ED		 432 /* we escape from rcu protected region, make sure we dont leak
433 * a norefcounted dst
434 */
435 skb_dst_force(skb);
436
3b885787 437 spin_lock_irqsave(&list->lock, flags);
3bc3b96f 438 sock_skb_set_dropcount(sk, skb);
3b885787
NH		 439 __skb_queue_tail(list, skb);
440 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 441
442 if (!sock_flag(sk, SOCK_DEAD))
676d2369 443 sk->sk_data_ready(sk);
766e9037 444 return 0;
f0088a50
DV		 445}
446EXPORT_SYMBOL(sock_queue_rcv_skb);
447
58a5a7b9 448int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 449{
450 int rc = NET_RX_SUCCESS;
451
fda9ef5d 452 if (sk_filter(sk, skb))
f0088a50
DV		 453 goto discard_and_relse;
454
455 skb->dev = NULL;
456
274f482d 457 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 458 atomic_inc(&sk->sk_drops);
459 goto discard_and_relse;
460 }
58a5a7b9
ACM		 461 if (nested)
462 bh_lock_sock_nested(sk);
463 else
464 bh_lock_sock(sk);
a5b5bb9a
IM		 465 if (!sock_owned_by_user(sk)) {
466 /*
467 * trylock + unlock semantics:
468 */
469 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
470
c57943a1 471 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 472
473 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 474 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 475 bh_unlock_sock(sk);
476 atomic_inc(&sk->sk_drops);
477 goto discard_and_relse;
478 }
479
f0088a50
DV		 480 bh_unlock_sock(sk);
481out:
482 sock_put(sk);
483 return rc;
484discard_and_relse:
485 kfree_skb(skb);
486 goto out;
487}
488EXPORT_SYMBOL(sk_receive_skb);
489
490struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
491{
b6c6712a 492 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 493
494 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 495 sk_tx_queue_clear(sk);
a9b3cd7f 496 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 497 dst_release(dst);
498 return NULL;
499 }
500
501 return dst;
502}
503EXPORT_SYMBOL(__sk_dst_check);
504
505struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
506{
507 struct dst_entry *dst = sk_dst_get(sk);
508
509 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
510 sk_dst_reset(sk);
511 dst_release(dst);
512 return NULL;
513 }
514
515 return dst;
516}
517EXPORT_SYMBOL(sk_dst_check);
518
c91f6df2
BH		 519static int sock_setbindtodevice(struct sock *sk, char __user *optval,
520 int optlen)
4878809f
DM		 521{
522 int ret = -ENOPROTOOPT;
523#ifdef CONFIG_NETDEVICES
3b1e0a65 524 struct net *net = sock_net(sk);
4878809f
DM		 525 char devname[IFNAMSIZ];
526 int index;
527
528 /* Sorry... */
529 ret = -EPERM;
5e1fccc0 530 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 531 goto out;
532
533 ret = -EINVAL;
534 if (optlen < 0)
535 goto out;
536
537 /* Bind this socket to a particular device like "eth0",
538 * as specified in the passed interface name. If the
539 * name is "" or the option length is zero the socket
540 * is not bound.
541 */
542 if (optlen > IFNAMSIZ - 1)
543 optlen = IFNAMSIZ - 1;
544 memset(devname, 0, sizeof(devname));
545
546 ret = -EFAULT;
547 if (copy_from_user(devname, optval, optlen))
548 goto out;
549
000ba2e4
DM		 550 index = 0;
551 if (devname[0] != '\0') {
bf8e56bf 552 struct net_device *dev;
4878809f 553
bf8e56bf
ED		 554 rcu_read_lock();
555 dev = dev_get_by_name_rcu(net, devname);
556 if (dev)
557 index = dev->ifindex;
558 rcu_read_unlock();
4878809f
DM		 559 ret = -ENODEV;
560 if (!dev)
561 goto out;
4878809f
DM		 562 }
563
564 lock_sock(sk);
565 sk->sk_bound_dev_if = index;
566 sk_dst_reset(sk);
567 release_sock(sk);
568
569 ret = 0;
570
571out:
572#endif
573
574 return ret;
575}
576
c91f6df2
BH		 577static int sock_getbindtodevice(struct sock *sk, char __user *optval,
578 int __user *optlen, int len)
579{
580 int ret = -ENOPROTOOPT;
581#ifdef CONFIG_NETDEVICES
582 struct net *net = sock_net(sk);
c91f6df2 583 char devname[IFNAMSIZ];
c91f6df2
BH		 584
585 if (sk->sk_bound_dev_if == 0) {
586 len = 0;
587 goto zero;
588 }
589
590 ret = -EINVAL;
591 if (len < IFNAMSIZ)
592 goto out;
593
5dbe7c17
NS		 594 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
595 if (ret)
c91f6df2 596 goto out;
c91f6df2
BH		 597
598 len = strlen(devname) + 1;
599
600 ret = -EFAULT;
601 if (copy_to_user(optval, devname, len))
602 goto out;
603
604zero:
605 ret = -EFAULT;
606 if (put_user(len, optlen))
607 goto out;
608
609 ret = 0;
610
611out:
612#endif
613
614 return ret;
615}
616
c0ef877b
PE		 617static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
618{
619 if (valbool)
620 sock_set_flag(sk, bit);
621 else
622 sock_reset_flag(sk, bit);
623}
624
f60e5990 625bool sk_mc_loop(struct sock *sk)
626{
627 if (dev_recursion_level())
628 return false;
629 if (!sk)
630 return true;
631 switch (sk->sk_family) {
632 case AF_INET:
633 return inet_sk(sk)->mc_loop;
634#if IS_ENABLED(CONFIG_IPV6)
635 case AF_INET6:
636 return inet6_sk(sk)->mc_loop;
637#endif
638 }
639 WARN_ON(1);
640 return true;
641}
642EXPORT_SYMBOL(sk_mc_loop);
643
1da177e4
LT		 644/*
645 * This is meant for all protocols to use and covers goings on
646 * at the socket level. Everything here is generic.
647 */
648
649int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 650 char __user *optval, unsigned int optlen)
1da177e4 651{
2a91525c 652 struct sock *sk = sock->sk;
1da177e4
LT		 653 int val;
654 int valbool;
655 struct linger ling;
656 int ret = 0;
4ec93edb 657
1da177e4
LT		 658 /*
659 * Options without arguments
660 */
661
4878809f 662 if (optname == SO_BINDTODEVICE)
c91f6df2 663 return sock_setbindtodevice(sk, optval, optlen);
4878809f 664
e71a4783
SH		 665 if (optlen < sizeof(int))
666 return -EINVAL;
4ec93edb 667
1da177e4
LT		 668 if (get_user(val, (int __user *)optval))
669 return -EFAULT;
4ec93edb 670
2a91525c 671 valbool = val ? 1 : 0;
1da177e4
LT		 672
673 lock_sock(sk);
674
2a91525c 675 switch (optname) {
e71a4783 676 case SO_DEBUG:
2a91525c 677 if (val && !capable(CAP_NET_ADMIN))
e71a4783 678 ret = -EACCES;
2a91525c 679 else
c0ef877b 680 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 681 break;
682 case SO_REUSEADDR:
4a17fd52 683 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 684 break;
055dc21a
TH		 685 case SO_REUSEPORT:
686 sk->sk_reuseport = valbool;
687 break;
e71a4783 688 case SO_TYPE:
49c794e9 689 case SO_PROTOCOL:
0d6038ee 690 case SO_DOMAIN:
e71a4783
SH		 691 case SO_ERROR:
692 ret = -ENOPROTOOPT;
693 break;
694 case SO_DONTROUTE:
c0ef877b 695 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 696 break;
697 case SO_BROADCAST:
698 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
699 break;
700 case SO_SNDBUF:
701 /* Don't error on this BSD doesn't and if you think
82981930
ED		 702 * about it this is right. Otherwise apps have to
703 * play 'guess the biggest size' games. RCVBUF/SNDBUF
704 * are treated in BSD as hints
705 */
706 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 707set_sndbuf:
e71a4783 708 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 709 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
710 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 711 sk->sk_write_space(sk);
712 break;
1da177e4 713
e71a4783
SH		 714 case SO_SNDBUFFORCE:
715 if (!capable(CAP_NET_ADMIN)) {
716 ret = -EPERM;
717 break;
718 }
719 goto set_sndbuf;
b0573dea 720
e71a4783
SH		 721 case SO_RCVBUF:
722 /* Don't error on this BSD doesn't and if you think
82981930
ED		 723 * about it this is right. Otherwise apps have to
724 * play 'guess the biggest size' games. RCVBUF/SNDBUF
725 * are treated in BSD as hints
726 */
727 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 728set_rcvbuf:
e71a4783
SH		 729 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
730 /*
731 * We double it on the way in to account for
732 * "struct sk_buff" etc. overhead. Applications
733 * assume that the SO_RCVBUF setting they make will
734 * allow that much actual data to be received on that
735 * socket.
736 *
737 * Applications are unaware that "struct sk_buff" and
738 * other overheads allocate from the receive buffer
739 * during socket buffer allocation.
740 *
741 * And after considering the possible alternatives,
742 * returning the value we actually used in getsockopt
743 * is the most desirable behavior.
744 */
82981930 745 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 746 break;
747
748 case SO_RCVBUFFORCE:
749 if (!capable(CAP_NET_ADMIN)) {
750 ret = -EPERM;
1da177e4 751 break;
e71a4783
SH		 752 }
753 goto set_rcvbuf;
1da177e4 754
e71a4783 755 case SO_KEEPALIVE:
1da177e4 756#ifdef CONFIG_INET
3e10986d
ED		 757 if (sk->sk_protocol == IPPROTO_TCP &&
758 sk->sk_type == SOCK_STREAM)
e71a4783 759 tcp_set_keepalive(sk, valbool);
1da177e4 760#endif
e71a4783
SH		 761 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
762 break;
763
764 case SO_OOBINLINE:
765 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
766 break;
767
768 case SO_NO_CHECK:
28448b80 769 sk->sk_no_check_tx = valbool;
e71a4783
SH		 770 break;
771
772 case SO_PRIORITY:
5e1fccc0
EB		 773 if ((val >= 0 && val <= 6) ||
774 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 775 sk->sk_priority = val;
776 else
777 ret = -EPERM;
778 break;
779
780 case SO_LINGER:
781 if (optlen < sizeof(ling)) {
782 ret = -EINVAL; /* 1003.1g */
1da177e4 783 break;
e71a4783 784 }
2a91525c 785 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 786 ret = -EFAULT;
1da177e4 787 break;
e71a4783
SH		 788 }
789 if (!ling.l_onoff)
790 sock_reset_flag(sk, SOCK_LINGER);
791 else {
1da177e4 792#if (BITS_PER_LONG == 32)
e71a4783
SH		 793 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
794 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 795 else
e71a4783
SH		 796#endif
797 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
798 sock_set_flag(sk, SOCK_LINGER);
799 }
800 break;
801
802 case SO_BSDCOMPAT:
803 sock_warn_obsolete_bsdism("setsockopt");
804 break;
805
806 case SO_PASSCRED:
807 if (valbool)
808 set_bit(SOCK_PASSCRED, &sock->flags);
809 else
810 clear_bit(SOCK_PASSCRED, &sock->flags);
811 break;
812
813 case SO_TIMESTAMP:
92f37fd2 814 case SO_TIMESTAMPNS:
e71a4783 815 if (valbool) {
92f37fd2
ED		 816 if (optname == SO_TIMESTAMP)
817 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
818 else
819 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 820 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 821 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 822 } else {
e71a4783 823 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 824 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
825 }
e71a4783
SH		 826 break;
827
20d49473
PO		 828 case SO_TIMESTAMPING:
829 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 830 ret = -EINVAL;
20d49473
PO		 831 break;
832 }
b245be1f 833
09c2d251 834 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765 835 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
ac5cc977
WC		 836 if (sk->sk_protocol == IPPROTO_TCP &&
837 sk->sk_type == SOCK_STREAM) {
4ed2d765
WB		 838 if (sk->sk_state != TCP_ESTABLISHED) {
839 ret = -EINVAL;
840 break;
841 }
842 sk->sk_tskey = tcp_sk(sk)->snd_una;
843 } else {
844 sk->sk_tskey = 0;
845 }
846 }
b9f40e21 847 sk->sk_tsflags = val;
20d49473
PO		 848 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
849 sock_enable_timestamp(sk,
850 SOCK_TIMESTAMPING_RX_SOFTWARE);
851 else
852 sock_disable_timestamp(sk,
08e29af3 853 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 854 break;
855
e71a4783
SH		 856 case SO_RCVLOWAT:
857 if (val < 0)
858 val = INT_MAX;
859 sk->sk_rcvlowat = val ? : 1;
860 break;
861
862 case SO_RCVTIMEO:
863 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
864 break;
865
866 case SO_SNDTIMEO:
867 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
868 break;
1da177e4 869
e71a4783
SH		 870 case SO_ATTACH_FILTER:
871 ret = -EINVAL;
872 if (optlen == sizeof(struct sock_fprog)) {
873 struct sock_fprog fprog;
1da177e4 874
e71a4783
SH		 875 ret = -EFAULT;
876 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 877 break;
e71a4783
SH		 878
879 ret = sk_attach_filter(&fprog, sk);
880 }
881 break;
882
89aa0758
AS		 883 case SO_ATTACH_BPF:
884 ret = -EINVAL;
885 if (optlen == sizeof(u32)) {
886 u32 ufd;
887
888 ret = -EFAULT;
889 if (copy_from_user(&ufd, optval, sizeof(ufd)))
890 break;
891
892 ret = sk_attach_bpf(ufd, sk);
893 }
894 break;
895
538950a1
CG		 896 case SO_ATTACH_REUSEPORT_CBPF:
897 ret = -EINVAL;
898 if (optlen == sizeof(struct sock_fprog)) {
899 struct sock_fprog fprog;
900
901 ret = -EFAULT;
902 if (copy_from_user(&fprog, optval, sizeof(fprog)))
903 break;
904
905 ret = sk_reuseport_attach_filter(&fprog, sk);
906 }
907 break;
908
909 case SO_ATTACH_REUSEPORT_EBPF:
910 ret = -EINVAL;
911 if (optlen == sizeof(u32)) {
912 u32 ufd;
913
914 ret = -EFAULT;
915 if (copy_from_user(&ufd, optval, sizeof(ufd)))
916 break;
917
918 ret = sk_reuseport_attach_bpf(ufd, sk);
919 }
920 break;
921
e71a4783 922 case SO_DETACH_FILTER:
55b33325 923 ret = sk_detach_filter(sk);
e71a4783 924 break;
1da177e4 925
d59577b6
VB		 926 case SO_LOCK_FILTER:
927 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
928 ret = -EPERM;
929 else
930 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
931 break;
932
e71a4783
SH		 933 case SO_PASSSEC:
934 if (valbool)
935 set_bit(SOCK_PASSSEC, &sock->flags);
936 else
937 clear_bit(SOCK_PASSSEC, &sock->flags);
938 break;
4a19ec58 939 case SO_MARK:
5e1fccc0 940 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 941 ret = -EPERM;
2a91525c 942 else
4a19ec58 943 sk->sk_mark = val;
4a19ec58 944 break;
877ce7c1 945
3b885787 946 case SO_RXQ_OVFL:
8083f0fc 947 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 948 break;
6e3e939f
JB		 949
950 case SO_WIFI_STATUS:
951 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
952 break;
953
ef64a54f
PE		 954 case SO_PEEK_OFF:
955 if (sock->ops->set_peek_off)
12663bfc 956 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 957 else
958 ret = -EOPNOTSUPP;
959 break;
3bdc0eba
BG		 960
961 case SO_NOFCS:
962 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
963 break;
964
7d4c04fc
KJ		 965 case SO_SELECT_ERR_QUEUE:
966 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
967 break;
968
e0d1095a 969#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 970 case SO_BUSY_POLL:
dafcc438
ET		 971 /* allow unprivileged users to decrease the value */
972 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
973 ret = -EPERM;
974 else {
975 if (val < 0)
976 ret = -EINVAL;
977 else
978 sk->sk_ll_usec = val;
979 }
980 break;
981#endif
62748f32
ED		 982
983 case SO_MAX_PACING_RATE:
984 sk->sk_max_pacing_rate = val;
985 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
986 sk->sk_max_pacing_rate);
987 break;
988
70da268b
ED		 989 case SO_INCOMING_CPU:
990 sk->sk_incoming_cpu = val;
991 break;
992
a87cb3e4
TH		 993 case SO_CNX_ADVICE:
994 if (val == 1)
995 dst_negative_advice(sk);
996 break;
e71a4783
SH		 997 default:
998 ret = -ENOPROTOOPT;
999 break;
4ec93edb 1000 }
1da177e4
LT		 1001 release_sock(sk);
1002 return ret;
1003}
2a91525c 1004EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 1005
1006
8f09898b 1007static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1008 struct ucred *ucred)
3f551f94
EB		 1009{
1010 ucred->pid = pid_vnr(pid);
1011 ucred->uid = ucred->gid = -1;
1012 if (cred) {
1013 struct user_namespace *current_ns = current_user_ns();
1014
b2e4f544
EB		 1015 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1016 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 1017 }
1018}
1019
1da177e4
LT		 1020int sock_getsockopt(struct socket *sock, int level, int optname,
1021 char __user *optval, int __user *optlen)
1022{
1023 struct sock *sk = sock->sk;
4ec93edb 1024
e71a4783 1025 union {
4ec93edb
YH		 1026 int val;
1027 struct linger ling;
1da177e4
LT		 1028 struct timeval tm;
1029 } v;
4ec93edb 1030
4d0392be 1031 int lv = sizeof(int);
1da177e4 1032 int len;
4ec93edb 1033
e71a4783 1034 if (get_user(len, optlen))
4ec93edb 1035 return -EFAULT;
e71a4783 1036 if (len < 0)
1da177e4 1037 return -EINVAL;
4ec93edb 1038
50fee1de 1039 memset(&v, 0, sizeof(v));
df0bca04 1040
2a91525c 1041 switch (optname) {
e71a4783
SH		 1042 case SO_DEBUG:
1043 v.val = sock_flag(sk, SOCK_DBG);
1044 break;
1045
1046 case SO_DONTROUTE:
1047 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1048 break;
1049
1050 case SO_BROADCAST:
1b23a5df 1051 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1052 break;
1053
1054 case SO_SNDBUF:
1055 v.val = sk->sk_sndbuf;
1056 break;
1057
1058 case SO_RCVBUF:
1059 v.val = sk->sk_rcvbuf;
1060 break;
1061
1062 case SO_REUSEADDR:
1063 v.val = sk->sk_reuse;
1064 break;
1065
055dc21a
TH		 1066 case SO_REUSEPORT:
1067 v.val = sk->sk_reuseport;
1068 break;
1069
e71a4783 1070 case SO_KEEPALIVE:
1b23a5df 1071 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1072 break;
1073
1074 case SO_TYPE:
1075 v.val = sk->sk_type;
1076 break;
1077
49c794e9
JE		 1078 case SO_PROTOCOL:
1079 v.val = sk->sk_protocol;
1080 break;
1081
0d6038ee
JE		 1082 case SO_DOMAIN:
1083 v.val = sk->sk_family;
1084 break;
1085
e71a4783
SH		 1086 case SO_ERROR:
1087 v.val = -sock_error(sk);
2a91525c 1088 if (v.val == 0)
e71a4783
SH		 1089 v.val = xchg(&sk->sk_err_soft, 0);
1090 break;
1091
1092 case SO_OOBINLINE:
1b23a5df 1093 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1094 break;
1095
1096 case SO_NO_CHECK:
28448b80 1097 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1098 break;
1099
1100 case SO_PRIORITY:
1101 v.val = sk->sk_priority;
1102 break;
1103
1104 case SO_LINGER:
1105 lv = sizeof(v.ling);
1b23a5df 1106 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1107 v.ling.l_linger = sk->sk_lingertime / HZ;
1108 break;
1109
1110 case SO_BSDCOMPAT:
1111 sock_warn_obsolete_bsdism("getsockopt");
1112 break;
1113
1114 case SO_TIMESTAMP:
92f37fd2
ED		 1115 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1116 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1117 break;
1118
1119 case SO_TIMESTAMPNS:
1120 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1121 break;
1122
20d49473 1123 case SO_TIMESTAMPING:
b9f40e21 1124 v.val = sk->sk_tsflags;
20d49473
PO		 1125 break;
1126
e71a4783 1127 case SO_RCVTIMEO:
2a91525c 1128 lv = sizeof(struct timeval);
e71a4783
SH		 1129 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1130 v.tm.tv_sec = 0;
1131 v.tm.tv_usec = 0;
1132 } else {
1133 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1134 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1135 }
1136 break;
1137
1138 case SO_SNDTIMEO:
2a91525c 1139 lv = sizeof(struct timeval);
e71a4783
SH		 1140 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1141 v.tm.tv_sec = 0;
1142 v.tm.tv_usec = 0;
1143 } else {
1144 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1145 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1146 }
1147 break;
1da177e4 1148
e71a4783
SH		 1149 case SO_RCVLOWAT:
1150 v.val = sk->sk_rcvlowat;
1151 break;
1da177e4 1152
e71a4783 1153 case SO_SNDLOWAT:
2a91525c 1154 v.val = 1;
e71a4783 1155 break;
1da177e4 1156
e71a4783 1157 case SO_PASSCRED:
82981930 1158 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1159 break;
1da177e4 1160
e71a4783 1161 case SO_PEERCRED:
109f6e39
EB		 1162 {
1163 struct ucred peercred;
1164 if (len > sizeof(peercred))
1165 len = sizeof(peercred);
1166 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1167 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1168 return -EFAULT;
1169 goto lenout;
109f6e39 1170 }
1da177e4 1171
e71a4783
SH		 1172 case SO_PEERNAME:
1173 {
1174 char address[128];
1175
1176 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1177 return -ENOTCONN;
1178 if (lv < len)
1179 return -EINVAL;
1180 if (copy_to_user(optval, address, len))
1181 return -EFAULT;
1182 goto lenout;
1183 }
1da177e4 1184
e71a4783
SH		 1185 /* Dubious BSD thing... Probably nobody even uses it, but
1186 * the UNIX standard wants it for whatever reason... -DaveM
1187 */
1188 case SO_ACCEPTCONN:
1189 v.val = sk->sk_state == TCP_LISTEN;
1190 break;
1da177e4 1191
e71a4783 1192 case SO_PASSSEC:
82981930 1193 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1194 break;
877ce7c1 1195
e71a4783
SH		 1196 case SO_PEERSEC:
1197 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1198
4a19ec58
LAT		 1199 case SO_MARK:
1200 v.val = sk->sk_mark;
1201 break;
1202
3b885787 1203 case SO_RXQ_OVFL:
1b23a5df 1204 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1205 break;
1206
6e3e939f 1207 case SO_WIFI_STATUS:
1b23a5df 1208 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1209 break;
1210
ef64a54f
PE		 1211 case SO_PEEK_OFF:
1212 if (!sock->ops->set_peek_off)
1213 return -EOPNOTSUPP;
1214
1215 v.val = sk->sk_peek_off;
1216 break;
bc2f7996 1217 case SO_NOFCS:
1b23a5df 1218 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1219 break;
c91f6df2 1220
f7b86bfe 1221 case SO_BINDTODEVICE:
c91f6df2
BH		 1222 return sock_getbindtodevice(sk, optval, optlen, len);
1223
a8fc9277
PE		 1224 case SO_GET_FILTER:
1225 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1226 if (len < 0)
1227 return len;
1228
1229 goto lenout;
c91f6df2 1230
d59577b6
VB		 1231 case SO_LOCK_FILTER:
1232 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1233 break;
1234
ea02f941
MS		 1235 case SO_BPF_EXTENSIONS:
1236 v.val = bpf_tell_extensions();
1237 break;
1238
7d4c04fc
KJ		 1239 case SO_SELECT_ERR_QUEUE:
1240 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1241 break;
1242
e0d1095a 1243#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1244 case SO_BUSY_POLL:
dafcc438
ET		 1245 v.val = sk->sk_ll_usec;
1246 break;
1247#endif
1248
62748f32
ED		 1249 case SO_MAX_PACING_RATE:
1250 v.val = sk->sk_max_pacing_rate;
1251 break;
1252
2c8c56e1
ED		 1253 case SO_INCOMING_CPU:
1254 v.val = sk->sk_incoming_cpu;
1255 break;
1256
e71a4783 1257 default:
443b5991
YH		 1258 /* We implement the SO_SNDLOWAT etc to not be settable
1259 * (1003.1g 7).
1260 */
e71a4783 1261 return -ENOPROTOOPT;
1da177e4 1262 }
e71a4783 1263
1da177e4
LT		 1264 if (len > lv)
1265 len = lv;
1266 if (copy_to_user(optval, &v, len))
1267 return -EFAULT;
1268lenout:
4ec93edb
YH		 1269 if (put_user(len, optlen))
1270 return -EFAULT;
1271 return 0;
1da177e4
LT		 1272}
1273
a5b5bb9a
IM		 1274/*
1275 * Initialize an sk_lock.
1276 *
1277 * (We also register the sk_lock with the lock validator.)
1278 */
b6f99a21 1279static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1280{
ed07536e
PZ		 1281 sock_lock_init_class_and_name(sk,
1282 af_family_slock_key_strings[sk->sk_family],
1283 af_family_slock_keys + sk->sk_family,
1284 af_family_key_strings[sk->sk_family],
1285 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1286}
1287
4dc6dc71
ED		 1288/*
1289 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1290 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1291 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1292 */
f1a6c4da
PE		 1293static void sock_copy(struct sock *nsk, const struct sock *osk)
1294{
1295#ifdef CONFIG_SECURITY_NETWORK
1296 void *sptr = nsk->sk_security;
1297#endif
68835aba
ED		 1298 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1299
1300 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1301 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1302
f1a6c4da
PE		 1303#ifdef CONFIG_SECURITY_NETWORK
1304 nsk->sk_security = sptr;
1305 security_sk_clone(osk, nsk);
1306#endif
1307}
1308
fcbdf09d
OP		 1309void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1310{
1311 unsigned long nulls1, nulls2;
1312
1313 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1314 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1315 if (nulls1 > nulls2)
1316 swap(nulls1, nulls2);
1317
1318 if (nulls1 != 0)
1319 memset((char *)sk, 0, nulls1);
1320 memset((char *)sk + nulls1 + sizeof(void *), 0,
1321 nulls2 - nulls1 - sizeof(void *));
1322 memset((char *)sk + nulls2 + sizeof(void *), 0,
1323 size - nulls2 - sizeof(void *));
1324}
1325EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1326
2e4afe7b
PE		 1327static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1328 int family)
c308c1b2
PE		 1329{
1330 struct sock *sk;
1331 struct kmem_cache *slab;
1332
1333 slab = prot->slab;
e912b114
ED		 1334 if (slab != NULL) {
1335 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1336 if (!sk)
1337 return sk;
1338 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1339 if (prot->clear_sk)
1340 prot->clear_sk(sk, prot->obj_size);
1341 else
1342 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1343 }
fcbdf09d 1344 } else
c308c1b2
PE		 1345 sk = kmalloc(prot->obj_size, priority);
1346
2e4afe7b 1347 if (sk != NULL) {
a98b65a3
VN		 1348 kmemcheck_annotate_bitfield(sk, flags);
1349
2e4afe7b
PE		 1350 if (security_sk_alloc(sk, family, priority))
1351 goto out_free;
1352
1353 if (!try_module_get(prot->owner))
1354 goto out_free_sec;
e022f0b4 1355 sk_tx_queue_clear(sk);
bd1060a1 1356 cgroup_sk_alloc(&sk->sk_cgrp_data);
2e4afe7b
PE		 1357 }
1358
c308c1b2 1359 return sk;
2e4afe7b
PE		 1360
1361out_free_sec:
1362 security_sk_free(sk);
1363out_free:
1364 if (slab != NULL)
1365 kmem_cache_free(slab, sk);
1366 else
1367 kfree(sk);
1368 return NULL;
c308c1b2
PE		 1369}
1370
1371static void sk_prot_free(struct proto *prot, struct sock *sk)
1372{
1373 struct kmem_cache *slab;
2e4afe7b 1374 struct module *owner;
c308c1b2 1375
2e4afe7b 1376 owner = prot->owner;
c308c1b2 1377 slab = prot->slab;
2e4afe7b 1378
bd1060a1 1379 cgroup_sk_free(&sk->sk_cgrp_data);
2e4afe7b 1380 security_sk_free(sk);
c308c1b2
PE		 1381 if (slab != NULL)
1382 kmem_cache_free(slab, sk);
1383 else
1384 kfree(sk);
2e4afe7b 1385 module_put(owner);
c308c1b2
PE		 1386}
1387
1da177e4
LT		 1388/**
1389 * sk_alloc - All socket objects are allocated here
c4ea43c5 1390 * @net: the applicable net namespace
4dc3b16b
PP		 1391 * @family: protocol family
1392 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1393 * @prot: struct proto associated with this new sock instance
11aa9c28 1394 * @kern: is this to be a kernel socket?
1da177e4 1395 */
1b8d7ae4 1396struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
11aa9c28 1397 struct proto *prot, int kern)
1da177e4 1398{
c308c1b2 1399 struct sock *sk;
1da177e4 1400
154adbc8 1401 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1402 if (sk) {
154adbc8
PE		 1403 sk->sk_family = family;
1404 /*
1405 * See comment in struct sock definition to understand
1406 * why we need sk_prot_creator -acme
1407 */
1408 sk->sk_prot = sk->sk_prot_creator = prot;
1409 sock_lock_init(sk);
26abe143
EB		 1410 sk->sk_net_refcnt = kern ? 0 : 1;
1411 if (likely(sk->sk_net_refcnt))
1412 get_net(net);
1413 sock_net_set(sk, net);
d66ee058 1414 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1415
2a56a1fe
TH		 1416 sock_update_classid(&sk->sk_cgrp_data);
1417 sock_update_netprioidx(&sk->sk_cgrp_data);
1da177e4 1418 }
a79af59e 1419
2e4afe7b 1420 return sk;
1da177e4 1421}
2a91525c 1422EXPORT_SYMBOL(sk_alloc);
1da177e4 1423
eb4cb008 1424void sk_destruct(struct sock *sk)
1da177e4
LT		 1425{
1426 struct sk_filter *filter;
1da177e4
LT		 1427
1428 if (sk->sk_destruct)
1429 sk->sk_destruct(sk);
1430
a898def2
PM		 1431 filter = rcu_dereference_check(sk->sk_filter,
1432 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1433 if (filter) {
309dd5fc 1434 sk_filter_uncharge(sk, filter);
a9b3cd7f 1435 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4 1436 }
538950a1
CG		 1437 if (rcu_access_pointer(sk->sk_reuseport_cb))
1438 reuseport_detach_sock(sk);
1da177e4 1439
08e29af3 1440 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1441
1442 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1443 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1444 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1445
109f6e39
EB		 1446 if (sk->sk_peer_cred)
1447 put_cred(sk->sk_peer_cred);
1448 put_pid(sk->sk_peer_pid);
26abe143
EB		 1449 if (likely(sk->sk_net_refcnt))
1450 put_net(sock_net(sk));
c308c1b2 1451 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1452}
2b85a34e 1453
eb4cb008
CG		 1454static void __sk_free(struct sock *sk)
1455{
b922622e 1456 if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt))
eb4cb008
CG		 1457 sock_diag_broadcast_destroy(sk);
1458 else
1459 sk_destruct(sk);
1460}
1461
2b85a34e
ED		 1462void sk_free(struct sock *sk)
1463{
1464 /*
25985edc 1465 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1466 * some packets are still in some tx queue.
1467 * If not null, sock_wfree() will call __sk_free(sk) later
1468 */
1469 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1470 __sk_free(sk);
1471}
2a91525c 1472EXPORT_SYMBOL(sk_free);
1da177e4 1473
e56c57d0
ED		 1474/**
1475 * sk_clone_lock - clone a socket, and lock its clone
1476 * @sk: the socket to clone
1477 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1478 *
1479 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1480 */
1481struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1482{
8fd1d178 1483 struct sock *newsk;
278571ba 1484 bool is_charged = true;
87d11ceb 1485
8fd1d178 1486 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1487 if (newsk != NULL) {
1488 struct sk_filter *filter;
1489
892c141e 1490 sock_copy(newsk, sk);
87d11ceb
ACM		 1491
1492 /* SANITY */
8a681736
SV		 1493 if (likely(newsk->sk_net_refcnt))
1494 get_net(sock_net(newsk));
87d11ceb
ACM		 1495 sk_node_init(&newsk->sk_node);
1496 sock_lock_init(newsk);
1497 bh_lock_sock(newsk);
fa438ccf 1498 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1499 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1500
1501 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1502 /*
1503 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1504 */
1505 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1506 atomic_set(&newsk->sk_omem_alloc, 0);
1507 skb_queue_head_init(&newsk->sk_receive_queue);
1508 skb_queue_head_init(&newsk->sk_write_queue);
1509
87d11ceb 1510 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1511 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1512 af_callback_keys + newsk->sk_family,
1513 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1514
1515 newsk->sk_dst_cache = NULL;
1516 newsk->sk_wmem_queued = 0;
1517 newsk->sk_forward_alloc = 0;
1518 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1519 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1520
1521 sock_reset_flag(newsk, SOCK_DONE);
1522 skb_queue_head_init(&newsk->sk_error_queue);
1523
0d7da9dd 1524 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb 1525 if (filter != NULL)
278571ba
AS		 1526 /* though it's an empty new sock, the charging may fail
1527 * if sysctl_optmem_max was changed between creation of
1528 * original socket and cloning
1529 */
1530 is_charged = sk_filter_charge(newsk, filter);
87d11ceb 1531
d188ba86 1532 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
87d11ceb
ACM		 1533 /* It is still raw copy of parent, so invalidate
1534 * destructor and make plain sk_free() */
1535 newsk->sk_destruct = NULL;
b0691c8e 1536 bh_unlock_sock(newsk);
87d11ceb
ACM		 1537 sk_free(newsk);
1538 newsk = NULL;
1539 goto out;
1540 }
fa463497 1541 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
87d11ceb
ACM		 1542
1543 newsk->sk_err = 0;
1544 newsk->sk_priority = 0;
2c8c56e1 1545 newsk->sk_incoming_cpu = raw_smp_processor_id();
33cf7c90 1546 atomic64_set(&newsk->sk_cookie, 0);
4dc6dc71
ED		 1547 /*
1548 * Before updating sk_refcnt, we must commit prior changes to memory
1549 * (Documentation/RCU/rculist_nulls.txt for details)
1550 */
1551 smp_wmb();
87d11ceb
ACM		 1552 atomic_set(&newsk->sk_refcnt, 2);
1553
1554 /*
1555 * Increment the counter in the same struct proto as the master
1556 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1557 * is the same as sk->sk_prot->socks, as this field was copied
1558 * with memcpy).
1559 *
1560 * This _changes_ the previous behaviour, where
1561 * tcp_create_openreq_child always was incrementing the
1562 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1563 * to be taken into account in all callers. -acme
1564 */
1565 sk_refcnt_debug_inc(newsk);
972692e0 1566 sk_set_socket(newsk, NULL);
43815482 1567 newsk->sk_wq = NULL;
87d11ceb 1568
baac50bb 1569 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
3d596f7b 1570 sock_update_memcg(newsk);
f3f511e1 1571
87d11ceb 1572 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1573 sk_sockets_allocated_inc(newsk);
704da560 1574
080a270f
HFS		 1575 if (sock_needs_netstamp(sk) &&
1576 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1577 net_enable_timestamp();
87d11ceb
ACM		 1578 }
1579out:
1580 return newsk;
1581}
e56c57d0 1582EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1583
9958089a
AK		 1584void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1585{
d6a4e26a
ED		 1586 u32 max_segs = 1;
1587
6bd4f355 1588 sk_dst_set(sk, dst);
9958089a
AK		 1589 sk->sk_route_caps = dst->dev->features;
1590 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1591 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1592 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1593 if (sk_can_gso(sk)) {
82cc1a7a 1594 if (dst->header_len) {
9958089a 1595 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1596 } else {
9958089a 1597 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1598 sk->sk_gso_max_size = dst->dev->gso_max_size;
d6a4e26a 1599 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
82cc1a7a 1600 }
9958089a 1601 }
d6a4e26a 1602 sk->sk_gso_max_segs = max_segs;
9958089a
AK		 1603}
1604EXPORT_SYMBOL_GPL(sk_setup_caps);
1605
1da177e4
LT		 1606/*
1607 * Simple resource managers for sockets.
1608 */
1609
1610
4ec93edb
YH		 1611/*
1612 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1613 */
1614void sock_wfree(struct sk_buff *skb)
1615{
1616 struct sock *sk = skb->sk;
d99927f4 1617 unsigned int len = skb->truesize;
1da177e4 1618
d99927f4
ED		 1619 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1620 /*
1621 * Keep a reference on sk_wmem_alloc, this will be released
1622 * after sk_write_space() call
1623 */
1624 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1625 sk->sk_write_space(sk);
d99927f4
ED		 1626 len = 1;
1627 }
2b85a34e 1628 /*
d99927f4
ED		 1629 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1630 * could not do because of in-flight packets
2b85a34e 1631 */
d99927f4 1632 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1633 __sk_free(sk);
1da177e4 1634}
2a91525c 1635EXPORT_SYMBOL(sock_wfree);
1da177e4 1636
9e17f8a4
ED		 1637void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1638{
1639 skb_orphan(skb);
1640 skb->sk = sk;
1641#ifdef CONFIG_INET
1642 if (unlikely(!sk_fullsock(sk))) {
1643 skb->destructor = sock_edemux;
1644 sock_hold(sk);
1645 return;
1646 }
1647#endif
1648 skb->destructor = sock_wfree;
1649 skb_set_hash_from_sk(skb, sk);
1650 /*
1651 * We used to take a refcount on sk, but following operation
1652 * is enough to guarantee sk_free() wont free this sock until
1653 * all in-flight packets are completed
1654 */
1655 atomic_add(skb->truesize, &sk->sk_wmem_alloc);
1656}
1657EXPORT_SYMBOL(skb_set_owner_w);
1658
f2f872f9
ED		 1659void skb_orphan_partial(struct sk_buff *skb)
1660{
1661 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1662 * so we do not completely orphan skb, but transfert all
1663 * accounted bytes but one, to avoid unexpected reorders.
1664 */
1665 if (skb->destructor == sock_wfree
1666#ifdef CONFIG_INET
1667 || skb->destructor == tcp_wfree
1668#endif
1669 ) {
1670 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1671 skb->truesize = 1;
1672 } else {
1673 skb_orphan(skb);
1674 }
1675}
1676EXPORT_SYMBOL(skb_orphan_partial);
1677
4ec93edb
YH		 1678/*
1679 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1680 */
1681void sock_rfree(struct sk_buff *skb)
1682{
1683 struct sock *sk = skb->sk;
d361fd59 1684 unsigned int len = skb->truesize;
1da177e4 1685
d361fd59
ED		 1686 atomic_sub(len, &sk->sk_rmem_alloc);
1687 sk_mem_uncharge(sk, len);
1da177e4 1688}
2a91525c 1689EXPORT_SYMBOL(sock_rfree);
1da177e4 1690
7768eed8
OH		 1691/*
1692 * Buffer destructor for skbs that are not used directly in read or write
1693 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1694 */
62bccb8c
AD		 1695void sock_efree(struct sk_buff *skb)
1696{
1697 sock_put(skb->sk);
1698}
1699EXPORT_SYMBOL(sock_efree);
1700
976d0201 1701kuid_t sock_i_uid(struct sock *sk)
1da177e4 1702{
976d0201 1703 kuid_t uid;
1da177e4 1704
f064af1e 1705 read_lock_bh(&sk->sk_callback_lock);
976d0201 1706 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1707 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1708 return uid;
1709}
2a91525c 1710EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1711
1712unsigned long sock_i_ino(struct sock *sk)
1713{
1714 unsigned long ino;
1715
f064af1e 1716 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1717 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1718 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1719 return ino;
1720}
2a91525c 1721EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1722
1723/*
1724 * Allocate a skb from the socket's send buffer.
1725 */
86a76caf 1726struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1727 gfp_t priority)
1da177e4
LT		 1728{
1729 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1730 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1731 if (skb) {
1732 skb_set_owner_w(skb, sk);
1733 return skb;
1734 }
1735 }
1736 return NULL;
1737}
2a91525c 1738EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1739
4ec93edb 1740/*
1da177e4 1741 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1742 */
dd0fc66f 1743void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1744{
95c96174 1745 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1746 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1747 void *mem;
1748 /* First do the add, to avoid the race if kmalloc
4ec93edb 1749 * might sleep.
1da177e4
LT		 1750 */
1751 atomic_add(size, &sk->sk_omem_alloc);
1752 mem = kmalloc(size, priority);
1753 if (mem)
1754 return mem;
1755 atomic_sub(size, &sk->sk_omem_alloc);
1756 }
1757 return NULL;
1758}
2a91525c 1759EXPORT_SYMBOL(sock_kmalloc);
1da177e4 1760
79e88659
DB		 1761/* Free an option memory block. Note, we actually want the inline
1762 * here as this allows gcc to detect the nullify and fold away the
1763 * condition entirely.
1da177e4 1764 */
79e88659
DB		 1765static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1766 const bool nullify)
1da177e4 1767{
e53da5fb
DM		 1768 if (WARN_ON_ONCE(!mem))
1769 return;
79e88659
DB		 1770 if (nullify)
1771 kzfree(mem);
1772 else
1773 kfree(mem);
1da177e4
LT		 1774 atomic_sub(size, &sk->sk_omem_alloc);
1775}
79e88659
DB		 1776
1777void sock_kfree_s(struct sock *sk, void *mem, int size)
1778{
1779 __sock_kfree_s(sk, mem, size, false);
1780}
2a91525c 1781EXPORT_SYMBOL(sock_kfree_s);
1da177e4 1782
79e88659
DB		 1783void sock_kzfree_s(struct sock *sk, void *mem, int size)
1784{
1785 __sock_kfree_s(sk, mem, size, true);
1786}
1787EXPORT_SYMBOL(sock_kzfree_s);
1788
1da177e4
LT		 1789/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1790 I think, these locks should be removed for datagram sockets.
1791 */
2a91525c 1792static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1793{
1794 DEFINE_WAIT(wait);
1795
9cd3e072 1796 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1da177e4
LT		 1797 for (;;) {
1798 if (!timeo)
1799 break;
1800 if (signal_pending(current))
1801 break;
1802 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1803 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1804 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1805 break;
1806 if (sk->sk_shutdown & SEND_SHUTDOWN)
1807 break;
1808 if (sk->sk_err)
1809 break;
1810 timeo = schedule_timeout(timeo);
1811 }
aa395145 1812 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1813 return timeo;
1814}
1815
1816
1817/*
1818 * Generic send/receive buffer handlers
1819 */
1820
4cc7f68d
HX		 1821struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1822 unsigned long data_len, int noblock,
28d64271 1823 int *errcode, int max_page_order)
1da177e4 1824{
2e4e4410 1825 struct sk_buff *skb;
1da177e4
LT		 1826 long timeo;
1827 int err;
1828
1da177e4 1829 timeo = sock_sndtimeo(sk, noblock);
2e4e4410 1830 for (;;) {
1da177e4
LT		 1831 err = sock_error(sk);
1832 if (err != 0)
1833 goto failure;
1834
1835 err = -EPIPE;
1836 if (sk->sk_shutdown & SEND_SHUTDOWN)
1837 goto failure;
1838
2e4e4410
ED		 1839 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
1840 break;
28d64271 1841
9cd3e072 1842 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2e4e4410
ED		 1843 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1844 err = -EAGAIN;
1845 if (!timeo)
1da177e4 1846 goto failure;
2e4e4410
ED		 1847 if (signal_pending(current))
1848 goto interrupted;
1849 timeo = sock_wait_for_wmem(sk, timeo);
1da177e4 1850 }
2e4e4410
ED		 1851 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
1852 errcode, sk->sk_allocation);
1853 if (skb)
1854 skb_set_owner_w(skb, sk);
1da177e4
LT		 1855 return skb;
1856
1857interrupted:
1858 err = sock_intr_errno(timeo);
1859failure:
1860 *errcode = err;
1861 return NULL;
1862}
4cc7f68d 1863EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1864
4ec93edb 1865struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1866 int noblock, int *errcode)
1867{
28d64271 1868 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1869}
2a91525c 1870EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1871
f28ea365
EJ		 1872int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
1873 struct sockcm_cookie *sockc)
1874{
1875 struct cmsghdr *cmsg;
1876
1877 for_each_cmsghdr(cmsg, msg) {
1878 if (!CMSG_OK(msg, cmsg))
1879 return -EINVAL;
1880 if (cmsg->cmsg_level != SOL_SOCKET)
1881 continue;
1882 switch (cmsg->cmsg_type) {
1883 case SO_MARK:
1884 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1885 return -EPERM;
1886 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
1887 return -EINVAL;
1888 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
1889 break;
1890 default:
1891 return -EINVAL;
1892 }
1893 }
1894 return 0;
1895}
1896EXPORT_SYMBOL(sock_cmsg_send);
1897
5640f768
ED		 1898/* On 32bit arches, an skb frag is limited to 2^15 */
1899#define SKB_FRAG_PAGE_ORDER get_order(32768)
1900
400dfd3a
ED		 1901/**
1902 * skb_page_frag_refill - check that a page_frag contains enough room
1903 * @sz: minimum size of the fragment we want to get
1904 * @pfrag: pointer to page_frag
82d5e2b8 1905 * @gfp: priority for memory allocation
400dfd3a
ED		 1906 *
1907 * Note: While this allocator tries to use high order pages, there is
1908 * no guarantee that allocations succeed. Therefore, @sz MUST be
1909 * less or equal than PAGE_SIZE.
1910 */
d9b2938a 1911bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 1912{
5640f768 1913 if (pfrag->page) {
fe896d18 1914 if (page_ref_count(pfrag->page) == 1) {
5640f768
ED		 1915 pfrag->offset = 0;
1916 return true;
1917 }
400dfd3a 1918 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1919 return true;
1920 put_page(pfrag->page);
1921 }
1922
d9b2938a
ED		 1923 pfrag->offset = 0;
1924 if (SKB_FRAG_PAGE_ORDER) {
d0164adc
MG		 1925 /* Avoid direct reclaim but allow kswapd to wake */
1926 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
1927 __GFP_COMP | __GFP_NOWARN |
1928 __GFP_NORETRY,
d9b2938a 1929 SKB_FRAG_PAGE_ORDER);
5640f768 1930 if (likely(pfrag->page)) {
d9b2938a 1931 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 1932 return true;
1933 }
d9b2938a
ED		 1934 }
1935 pfrag->page = alloc_page(gfp);
1936 if (likely(pfrag->page)) {
1937 pfrag->size = PAGE_SIZE;
1938 return true;
1939 }
400dfd3a
ED		 1940 return false;
1941}
1942EXPORT_SYMBOL(skb_page_frag_refill);
1943
1944bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1945{
1946 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1947 return true;
1948
5640f768
ED		 1949 sk_enter_memory_pressure(sk);
1950 sk_stream_moderate_sndbuf(sk);
1951 return false;
1952}
1953EXPORT_SYMBOL(sk_page_frag_refill);
1954
1da177e4 1955static void __lock_sock(struct sock *sk)
f39234d6
NK		 1956 __releases(&sk->sk_lock.slock)
1957 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1958{
1959 DEFINE_WAIT(wait);
1960
e71a4783 1961 for (;;) {
1da177e4
LT		 1962 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1963 TASK_UNINTERRUPTIBLE);
1964 spin_unlock_bh(&sk->sk_lock.slock);
1965 schedule();
1966 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1967 if (!sock_owned_by_user(sk))
1da177e4
LT		 1968 break;
1969 }
1970 finish_wait(&sk->sk_lock.wq, &wait);
1971}
1972
1973static void __release_sock(struct sock *sk)
f39234d6
NK		 1974 __releases(&sk->sk_lock.slock)
1975 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1976{
1977 struct sk_buff *skb = sk->sk_backlog.head;
1978
1979 do {
1980 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1981 bh_unlock_sock(sk);
1982
1983 do {
1984 struct sk_buff *next = skb->next;
1985
e4cbb02a 1986 prefetch(next);
7fee226a 1987 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1988 skb->next = NULL;
c57943a1 1989 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1990
1991 /*
1992 * We are in process context here with softirqs
1993 * disabled, use cond_resched_softirq() to preempt.
1994 * This is safe to do because we've taken the backlog
1995 * queue private:
1996 */
1997 cond_resched_softirq();
1998
1999 skb = next;
2000 } while (skb != NULL);
2001
2002 bh_lock_sock(sk);
e71a4783 2003 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 2004
2005 /*
2006 * Doing the zeroing here guarantee we can not loop forever
2007 * while a wild producer attempts to flood us.
2008 */
2009 sk->sk_backlog.len = 0;
1da177e4
LT		 2010}
2011
2012/**
2013 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 2014 * @sk: sock to wait on
2015 * @timeo: for how long
dfbafc99 2016 * @skb: last skb seen on sk_receive_queue
1da177e4
LT		 2017 *
2018 * Now socket state including sk->sk_err is changed only under lock,
2019 * hence we may omit checks after joining wait queue.
2020 * We check receive queue before schedule() only as optimization;
2021 * it is very likely that release_sock() added new data.
2022 */
dfbafc99 2023int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
1da177e4
LT		 2024{
2025 int rc;
2026 DEFINE_WAIT(wait);
2027
aa395145 2028 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9cd3e072 2029 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
dfbafc99 2030 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb);
9cd3e072 2031 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
aa395145 2032 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 2033 return rc;
2034}
1da177e4
LT		 2035EXPORT_SYMBOL(sk_wait_data);
2036
3ab224be
HA		 2037/**
2038 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2039 * @sk: socket
2040 * @size: memory size to allocate
2041 * @kind: allocation type
2042 *
2043 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2044 * rmem allocation. This function assumes that protocols which have
2045 * memory_pressure use sk_wmem_queued as write buffer accounting.
2046 */
2047int __sk_mem_schedule(struct sock *sk, int size, int kind)
2048{
2049 struct proto *prot = sk->sk_prot;
2050 int amt = sk_mem_pages(size);
8d987e5c 2051 long allocated;
3ab224be
HA		 2052
2053 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 2054
e805605c
JW		 2055 allocated = sk_memory_allocated_add(sk, amt);
2056
baac50bb
JW		 2057 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2058 !mem_cgroup_charge_skmem(sk->sk_memcg, amt))
e805605c 2059 goto suppress_allocation;
3ab224be
HA		 2060
2061 /* Under limit. */
e805605c 2062 if (allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2063 sk_leave_memory_pressure(sk);
3ab224be
HA		 2064 return 1;
2065 }
2066
e805605c
JW		 2067 /* Under pressure. */
2068 if (allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2069 sk_enter_memory_pressure(sk);
3ab224be 2070
e805605c
JW		 2071 /* Over hard limit. */
2072 if (allocated > sk_prot_mem_limits(sk, 2))
3ab224be
HA		 2073 goto suppress_allocation;
2074
2075 /* guarantee minimum buffer size under pressure */
2076 if (kind == SK_MEM_RECV) {
2077 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2078 return 1;
180d8cd9 2079
3ab224be
HA		 2080 } else { /* SK_MEM_SEND */
2081 if (sk->sk_type == SOCK_STREAM) {
2082 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2083 return 1;
2084 } else if (atomic_read(&sk->sk_wmem_alloc) <
2085 prot->sysctl_wmem[0])
2086 return 1;
2087 }
2088
180d8cd9 2089 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2090 int alloc;
2091
180d8cd9 2092 if (!sk_under_memory_pressure(sk))
1748376b 2093 return 1;
180d8cd9
GC		 2094 alloc = sk_sockets_allocated_read_positive(sk);
2095 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2096 sk_mem_pages(sk->sk_wmem_queued +
2097 atomic_read(&sk->sk_rmem_alloc) +
2098 sk->sk_forward_alloc))
2099 return 1;
2100 }
2101
2102suppress_allocation:
2103
2104 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2105 sk_stream_moderate_sndbuf(sk);
2106
2107 /* Fail only if socket is _under_ its sndbuf.
2108 * In this case we cannot block, so that we have to fail.
2109 */
2110 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2111 return 1;
2112 }
2113
3847ce32
SM		 2114 trace_sock_exceed_buf_limit(sk, prot, allocated);
2115
3ab224be
HA		 2116 /* Alas. Undo changes. */
2117 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2118
0e90b31f 2119 sk_memory_allocated_sub(sk, amt);
180d8cd9 2120
baac50bb
JW		 2121 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2122 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
e805605c 2123
3ab224be
HA		 2124 return 0;
2125}
3ab224be
HA		 2126EXPORT_SYMBOL(__sk_mem_schedule);
2127
2128/**
69dba9bb 2129 * __sk_mem_reclaim - reclaim memory_allocated
3ab224be 2130 * @sk: socket
1a24e04e 2131 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
3ab224be 2132 */
1a24e04e 2133void __sk_mem_reclaim(struct sock *sk, int amount)
3ab224be 2134{
1a24e04e
ED		 2135 amount >>= SK_MEM_QUANTUM_SHIFT;
2136 sk_memory_allocated_sub(sk, amount);
2137 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
3ab224be 2138
baac50bb
JW		 2139 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2140 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
e805605c 2141
180d8cd9
GC		 2142 if (sk_under_memory_pressure(sk) &&
2143 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2144 sk_leave_memory_pressure(sk);
3ab224be 2145}
3ab224be
HA		 2146EXPORT_SYMBOL(__sk_mem_reclaim);
2147
2148
1da177e4
LT		 2149/*
2150 * Set of default routines for initialising struct proto_ops when
2151 * the protocol does not support a particular function. In certain
2152 * cases where it makes no sense for a protocol to have a "do nothing"
2153 * function, some default processing is provided.
2154 */
2155
2156int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2157{
2158 return -EOPNOTSUPP;
2159}
2a91525c 2160EXPORT_SYMBOL(sock_no_bind);
1da177e4 2161
4ec93edb 2162int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2163 int len, int flags)
2164{
2165 return -EOPNOTSUPP;
2166}
2a91525c 2167EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2168
2169int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2170{
2171 return -EOPNOTSUPP;
2172}
2a91525c 2173EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2174
2175int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2176{
2177 return -EOPNOTSUPP;
2178}
2a91525c 2179EXPORT_SYMBOL(sock_no_accept);
1da177e4 2180
4ec93edb 2181int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2182 int *len, int peer)
2183{
2184 return -EOPNOTSUPP;
2185}
2a91525c 2186EXPORT_SYMBOL(sock_no_getname);
1da177e4 2187
2a91525c 2188unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2189{
2190 return 0;
2191}
2a91525c 2192EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2193
2194int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2195{
2196 return -EOPNOTSUPP;
2197}
2a91525c 2198EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2199
2200int sock_no_listen(struct socket *sock, int backlog)
2201{
2202 return -EOPNOTSUPP;
2203}
2a91525c 2204EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2205
2206int sock_no_shutdown(struct socket *sock, int how)
2207{
2208 return -EOPNOTSUPP;
2209}
2a91525c 2210EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2211
2212int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2213 char __user *optval, unsigned int optlen)
1da177e4
LT		 2214{
2215 return -EOPNOTSUPP;
2216}
2a91525c 2217EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2218
2219int sock_no_getsockopt(struct socket *sock, int level, int optname,
2220 char __user *optval, int __user *optlen)
2221{
2222 return -EOPNOTSUPP;
2223}
2a91525c 2224EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4 2225
1b784140 2226int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
1da177e4
LT		 2227{
2228 return -EOPNOTSUPP;
2229}
2a91525c 2230EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4 2231
1b784140
YX		 2232int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2233 int flags)
1da177e4
LT		 2234{
2235 return -EOPNOTSUPP;
2236}
2a91525c 2237EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2238
2239int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2240{
2241 /* Mirror missing mmap method error code */
2242 return -ENODEV;
2243}
2a91525c 2244EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2245
2246ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2247{
2248 ssize_t res;
2249 struct msghdr msg = {.msg_flags = flags};
2250 struct kvec iov;
2251 char *kaddr = kmap(page);
2252 iov.iov_base = kaddr + offset;
2253 iov.iov_len = size;
2254 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2255 kunmap(page);
2256 return res;
2257}
2a91525c 2258EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2259
2260/*
2261 * Default Socket Callbacks
2262 */
2263
2264static void sock_def_wakeup(struct sock *sk)
2265{
43815482
ED		 2266 struct socket_wq *wq;
2267
2268 rcu_read_lock();
2269 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2270 if (skwq_has_sleeper(wq))
43815482
ED		 2271 wake_up_interruptible_all(&wq->wait);
2272 rcu_read_unlock();
1da177e4
LT		 2273}
2274
2275static void sock_def_error_report(struct sock *sk)
2276{
43815482
ED		 2277 struct socket_wq *wq;
2278
2279 rcu_read_lock();
2280 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2281 if (skwq_has_sleeper(wq))
43815482 2282 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2283 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2284 rcu_read_unlock();
1da177e4
LT		 2285}
2286
676d2369 2287static void sock_def_readable(struct sock *sk)
1da177e4 2288{
43815482
ED		 2289 struct socket_wq *wq;
2290
2291 rcu_read_lock();
2292 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2293 if (skwq_has_sleeper(wq))
2c6607c6 2294 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2295 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2296 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2297 rcu_read_unlock();
1da177e4
LT		 2298}
2299
2300static void sock_def_write_space(struct sock *sk)
2301{
43815482
ED		 2302 struct socket_wq *wq;
2303
2304 rcu_read_lock();
1da177e4
LT		 2305
2306 /* Do not wake up a writer until he can make "significant"
2307 * progress. --DaveM
2308 */
e71a4783 2309 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482 2310 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2311 if (skwq_has_sleeper(wq))
43815482 2312 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2313 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2314
2315 /* Should agree with poll, otherwise some programs break */
2316 if (sock_writeable(sk))
8d8ad9d7 2317 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2318 }
2319
43815482 2320 rcu_read_unlock();
1da177e4
LT		 2321}
2322
2323static void sock_def_destruct(struct sock *sk)
2324{
1da177e4
LT		 2325}
2326
2327void sk_send_sigurg(struct sock *sk)
2328{
2329 if (sk->sk_socket && sk->sk_socket->file)
2330 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2331 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2332}
2a91525c 2333EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2334
2335void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2336 unsigned long expires)
2337{
2338 if (!mod_timer(timer, expires))
2339 sock_hold(sk);
2340}
1da177e4
LT		 2341EXPORT_SYMBOL(sk_reset_timer);
2342
2343void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2344{
25cc4ae9 2345 if (del_timer(timer))
1da177e4
LT		 2346 __sock_put(sk);
2347}
1da177e4
LT		 2348EXPORT_SYMBOL(sk_stop_timer);
2349
2350void sock_init_data(struct socket *sock, struct sock *sk)
2351{
2352 skb_queue_head_init(&sk->sk_receive_queue);
2353 skb_queue_head_init(&sk->sk_write_queue);
2354 skb_queue_head_init(&sk->sk_error_queue);
2355
2356 sk->sk_send_head = NULL;
2357
2358 init_timer(&sk->sk_timer);
4ec93edb 2359
1da177e4
LT		 2360 sk->sk_allocation = GFP_KERNEL;
2361 sk->sk_rcvbuf = sysctl_rmem_default;
2362 sk->sk_sndbuf = sysctl_wmem_default;
2363 sk->sk_state = TCP_CLOSE;
972692e0 2364 sk_set_socket(sk, sock);
1da177e4
LT		 2365
2366 sock_set_flag(sk, SOCK_ZAPPED);
2367
e71a4783 2368 if (sock) {
1da177e4 2369 sk->sk_type = sock->type;
43815482 2370 sk->sk_wq = sock->wq;
1da177e4
LT		 2371 sock->sk = sk;
2372 } else
43815482 2373 sk->sk_wq = NULL;
1da177e4 2374
1da177e4 2375 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2376 lockdep_set_class_and_name(&sk->sk_callback_lock,
2377 af_callback_keys + sk->sk_family,
2378 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2379
2380 sk->sk_state_change = sock_def_wakeup;
2381 sk->sk_data_ready = sock_def_readable;
2382 sk->sk_write_space = sock_def_write_space;
2383 sk->sk_error_report = sock_def_error_report;
2384 sk->sk_destruct = sock_def_destruct;
2385
5640f768
ED		 2386 sk->sk_frag.page = NULL;
2387 sk->sk_frag.offset = 0;
ef64a54f 2388 sk->sk_peek_off = -1;
1da177e4 2389
109f6e39
EB		 2390 sk->sk_peer_pid = NULL;
2391 sk->sk_peer_cred = NULL;
1da177e4
LT		 2392 sk->sk_write_pending = 0;
2393 sk->sk_rcvlowat = 1;
2394 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2395 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2396
f37f0afb 2397 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2398
e0d1095a 2399#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2400 sk->sk_napi_id = 0;
64b0dc51 2401 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2402#endif
2403
62748f32 2404 sk->sk_max_pacing_rate = ~0U;
7eec4174 2405 sk->sk_pacing_rate = ~0U;
70da268b 2406 sk->sk_incoming_cpu = -1;
4dc6dc71
ED		 2407 /*
2408 * Before updating sk_refcnt, we must commit prior changes to memory
2409 * (Documentation/RCU/rculist_nulls.txt for details)
2410 */
2411 smp_wmb();
1da177e4 2412 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2413 atomic_set(&sk->sk_drops, 0);
1da177e4 2414}
2a91525c 2415EXPORT_SYMBOL(sock_init_data);
1da177e4 2416
b5606c2d 2417void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2418{
2419 might_sleep();
a5b5bb9a 2420 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2421 if (sk->sk_lock.owned)
1da177e4 2422 __lock_sock(sk);
d2e9117c 2423 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2424 spin_unlock(&sk->sk_lock.slock);
2425 /*
2426 * The sk_lock has mutex_lock() semantics here:
2427 */
fcc70d5f 2428 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2429 local_bh_enable();
1da177e4 2430}
fcc70d5f 2431EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2432
b5606c2d 2433void release_sock(struct sock *sk)
1da177e4 2434{
a5b5bb9a
IM		 2435 /*
2436 * The sk_lock has mutex_unlock() semantics:
2437 */
2438 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2439
2440 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2441 if (sk->sk_backlog.tail)
2442 __release_sock(sk);
46d3ceab 2443
c3f9b018
ED		 2444 /* Warning : release_cb() might need to release sk ownership,
2445 * ie call sock_release_ownership(sk) before us.
2446 */
46d3ceab
ED		 2447 if (sk->sk_prot->release_cb)
2448 sk->sk_prot->release_cb(sk);
2449
c3f9b018 2450 sock_release_ownership(sk);
a5b5bb9a
IM		 2451 if (waitqueue_active(&sk->sk_lock.wq))
2452 wake_up(&sk->sk_lock.wq);
2453 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2454}
2455EXPORT_SYMBOL(release_sock);
2456
8a74ad60
ED		 2457/**
2458 * lock_sock_fast - fast version of lock_sock
2459 * @sk: socket
2460 *
2461 * This version should be used for very small section, where process wont block
2462 * return false if fast path is taken
2463 * sk_lock.slock locked, owned = 0, BH disabled
2464 * return true if slow path is taken
2465 * sk_lock.slock unlocked, owned = 1, BH enabled
2466 */
2467bool lock_sock_fast(struct sock *sk)
2468{
2469 might_sleep();
2470 spin_lock_bh(&sk->sk_lock.slock);
2471
2472 if (!sk->sk_lock.owned)
2473 /*
2474 * Note : We must disable BH
2475 */
2476 return false;
2477
2478 __lock_sock(sk);
2479 sk->sk_lock.owned = 1;
2480 spin_unlock(&sk->sk_lock.slock);
2481 /*
2482 * The sk_lock has mutex_lock() semantics here:
2483 */
2484 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2485 local_bh_enable();
2486 return true;
2487}
2488EXPORT_SYMBOL(lock_sock_fast);
2489
1da177e4 2490int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2491{
b7aa0bf7 2492 struct timeval tv;
1da177e4 2493 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2494 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2495 tv = ktime_to_timeval(sk->sk_stamp);
2496 if (tv.tv_sec == -1)
1da177e4 2497 return -ENOENT;
b7aa0bf7
ED		 2498 if (tv.tv_sec == 0) {
2499 sk->sk_stamp = ktime_get_real();
2500 tv = ktime_to_timeval(sk->sk_stamp);
2501 }
2502 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2503}
1da177e4
LT		 2504EXPORT_SYMBOL(sock_get_timestamp);
2505
ae40eb1e
ED		 2506int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2507{
2508 struct timespec ts;
2509 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2510 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2511 ts = ktime_to_timespec(sk->sk_stamp);
2512 if (ts.tv_sec == -1)
2513 return -ENOENT;
2514 if (ts.tv_sec == 0) {
2515 sk->sk_stamp = ktime_get_real();
2516 ts = ktime_to_timespec(sk->sk_stamp);
2517 }
2518 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2519}
2520EXPORT_SYMBOL(sock_get_timestampns);
2521
20d49473 2522void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2523{
20d49473 2524 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2525 unsigned long previous_flags = sk->sk_flags;
2526
20d49473
PO		 2527 sock_set_flag(sk, flag);
2528 /*
2529 * we just set one of the two flags which require net
2530 * time stamping, but time stamping might have been on
2531 * already because of the other one
2532 */
080a270f
HFS		 2533 if (sock_needs_netstamp(sk) &&
2534 !(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2535 net_enable_timestamp();
1da177e4
LT		 2536 }
2537}
1da177e4 2538
cb820f8e
RC		 2539int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2540 int level, int type)
2541{
2542 struct sock_exterr_skb *serr;
364a9e93 2543 struct sk_buff *skb;
cb820f8e
RC		 2544 int copied, err;
2545
2546 err = -EAGAIN;
364a9e93 2547 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 2548 if (skb == NULL)
2549 goto out;
2550
2551 copied = skb->len;
2552 if (copied > len) {
2553 msg->msg_flags |= MSG_TRUNC;
2554 copied = len;
2555 }
51f3d02b 2556 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 2557 if (err)
2558 goto out_free_skb;
2559
2560 sock_recv_timestamp(msg, sk, skb);
2561
2562 serr = SKB_EXT_ERR(skb);
2563 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2564
2565 msg->msg_flags |= MSG_ERRQUEUE;
2566 err = copied;
2567
cb820f8e
RC		 2568out_free_skb:
2569 kfree_skb(skb);
2570out:
2571 return err;
2572}
2573EXPORT_SYMBOL(sock_recv_errqueue);
2574
1da177e4
LT		 2575/*
2576 * Get a socket option on an socket.
2577 *
2578 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2579 * asynchronous errors should be reported by getsockopt. We assume
2580 * this means if you specify SO_ERROR (otherwise whats the point of it).
2581 */
2582int sock_common_getsockopt(struct socket *sock, int level, int optname,
2583 char __user *optval, int __user *optlen)
2584{
2585 struct sock *sk = sock->sk;
2586
2587 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2588}
1da177e4
LT		 2589EXPORT_SYMBOL(sock_common_getsockopt);
2590
3fdadf7d 2591#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2592int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2593 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2594{
2595 struct sock *sk = sock->sk;
2596
1e51f951 2597 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2598 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2599 optval, optlen);
3fdadf7d
DM		 2600 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2601}
2602EXPORT_SYMBOL(compat_sock_common_getsockopt);
2603#endif
2604
1b784140
YX		 2605int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2606 int flags)
1da177e4
LT		 2607{
2608 struct sock *sk = sock->sk;
2609 int addr_len = 0;
2610 int err;
2611
1b784140 2612 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
1da177e4
LT		 2613 flags & ~MSG_DONTWAIT, &addr_len);
2614 if (err >= 0)
2615 msg->msg_namelen = addr_len;
2616 return err;
2617}
1da177e4
LT		 2618EXPORT_SYMBOL(sock_common_recvmsg);
2619
2620/*
2621 * Set socket options on an inet socket.
2622 */
2623int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2624 char __user *optval, unsigned int optlen)
1da177e4
LT		 2625{
2626 struct sock *sk = sock->sk;
2627
2628 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2629}
1da177e4
LT		 2630EXPORT_SYMBOL(sock_common_setsockopt);
2631
3fdadf7d 2632#ifdef CONFIG_COMPAT
543d9cfe 2633int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2634 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2635{
2636 struct sock *sk = sock->sk;
2637
543d9cfe
ACM		 2638 if (sk->sk_prot->compat_setsockopt != NULL)
2639 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2640 optval, optlen);
3fdadf7d
DM		 2641 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2642}
2643EXPORT_SYMBOL(compat_sock_common_setsockopt);
2644#endif
2645
1da177e4
LT		 2646void sk_common_release(struct sock *sk)
2647{
2648 if (sk->sk_prot->destroy)
2649 sk->sk_prot->destroy(sk);
2650
2651 /*
2652 * Observation: when sock_common_release is called, processes have
2653 * no access to socket. But net still has.
2654 * Step one, detach it from networking:
2655 *
2656 * A. Remove from hash tables.
2657 */
2658
2659 sk->sk_prot->unhash(sk);
2660
2661 /*
2662 * In this point socket cannot receive new packets, but it is possible
2663 * that some packets are in flight because some CPU runs receiver and
2664 * did hash table lookup before we unhashed socket. They will achieve
2665 * receive queue and will be purged by socket destructor.
2666 *
2667 * Also we still have packets pending on receive queue and probably,
2668 * our own packets waiting in device queues. sock_destroy will drain
2669 * receive queue, but transmitted packets will delay socket destruction
2670 * until the last reference will be released.
2671 */
2672
2673 sock_orphan(sk);
2674
2675 xfrm_sk_free_policy(sk);
2676
e6848976 2677 sk_refcnt_debug_release(sk);
5640f768
ED		 2678
2679 if (sk->sk_frag.page) {
2680 put_page(sk->sk_frag.page);
2681 sk->sk_frag.page = NULL;
2682 }
2683
1da177e4
LT		 2684 sock_put(sk);
2685}
1da177e4
LT		 2686EXPORT_SYMBOL(sk_common_release);
2687
13ff3d6f
PE		 2688#ifdef CONFIG_PROC_FS
2689#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2690struct prot_inuse {
2691 int val[PROTO_INUSE_NR];
2692};
13ff3d6f
PE		 2693
2694static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2695
2696#ifdef CONFIG_NET_NS
2697void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2698{
d6d9ca0f 2699 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2700}
2701EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2702
2703int sock_prot_inuse_get(struct net *net, struct proto *prot)
2704{
2705 int cpu, idx = prot->inuse_idx;
2706 int res = 0;
2707
2708 for_each_possible_cpu(cpu)
2709 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2710
2711 return res >= 0 ? res : 0;
2712}
2713EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2714
2c8c1e72 2715static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2716{
2717 net->core.inuse = alloc_percpu(struct prot_inuse);
2718 return net->core.inuse ? 0 : -ENOMEM;
2719}
2720
2c8c1e72 2721static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2722{
2723 free_percpu(net->core.inuse);
2724}
2725
2726static struct pernet_operations net_inuse_ops = {
2727 .init = sock_inuse_init_net,
2728 .exit = sock_inuse_exit_net,
2729};
2730
2731static __init int net_inuse_init(void)
2732{
2733 if (register_pernet_subsys(&net_inuse_ops))
2734 panic("Cannot initialize net inuse counters");
2735
2736 return 0;
2737}
2738
2739core_initcall(net_inuse_init);
2740#else
1338d466
PE		 2741static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2742
c29a0bc4 2743void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2744{
d6d9ca0f 2745 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2746}
2747EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2748
c29a0bc4 2749int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2750{
2751 int cpu, idx = prot->inuse_idx;
2752 int res = 0;
2753
2754 for_each_possible_cpu(cpu)
2755 res += per_cpu(prot_inuse, cpu).val[idx];
2756
2757 return res >= 0 ? res : 0;
2758}
2759EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2760#endif
13ff3d6f
PE		 2761
2762static void assign_proto_idx(struct proto *prot)
2763{
2764 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2765
2766 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2767 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2768 return;
2769 }
2770
2771 set_bit(prot->inuse_idx, proto_inuse_idx);
2772}
2773
2774static void release_proto_idx(struct proto *prot)
2775{
2776 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2777 clear_bit(prot->inuse_idx, proto_inuse_idx);
2778}
2779#else
2780static inline void assign_proto_idx(struct proto *prot)
2781{
2782}
2783
2784static inline void release_proto_idx(struct proto *prot)
2785{
2786}
2787#endif
2788
0159dfd3
ED		 2789static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
2790{
2791 if (!rsk_prot)
2792 return;
2793 kfree(rsk_prot->slab_name);
2794 rsk_prot->slab_name = NULL;
adf78eda
JL		 2795 kmem_cache_destroy(rsk_prot->slab);
2796 rsk_prot->slab = NULL;
0159dfd3
ED		 2797}
2798
2799static int req_prot_init(const struct proto *prot)
2800{
2801 struct request_sock_ops *rsk_prot = prot->rsk_prot;
2802
2803 if (!rsk_prot)
2804 return 0;
2805
2806 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
2807 prot->name);
2808 if (!rsk_prot->slab_name)
2809 return -ENOMEM;
2810
2811 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
2812 rsk_prot->obj_size, 0,
e96f78ab 2813 prot->slab_flags, NULL);
0159dfd3
ED		 2814
2815 if (!rsk_prot->slab) {
2816 pr_crit("%s: Can't create request sock SLAB cache!\n",
2817 prot->name);
2818 return -ENOMEM;
2819 }
2820 return 0;
2821}
2822
b733c007
PE		 2823int proto_register(struct proto *prot, int alloc_slab)
2824{
1da177e4
LT		 2825 if (alloc_slab) {
2826 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2827 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2828 NULL);
1da177e4
LT		 2829
2830 if (prot->slab == NULL) {
e005d193
JP		 2831 pr_crit("%s: Can't create sock SLAB cache!\n",
2832 prot->name);
60e7663d 2833 goto out;
1da177e4 2834 }
2e6599cb 2835
0159dfd3
ED		 2836 if (req_prot_init(prot))
2837 goto out_free_request_sock_slab;
8feaf0c0 2838
6d6ee43e 2839 if (prot->twsk_prot != NULL) {
faf23422 2840 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2841
7e56b5d6 2842 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2843 goto out_free_request_sock_slab;
2844
6d6ee43e 2845 prot->twsk_prot->twsk_slab =
7e56b5d6 2846 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2847 prot->twsk_prot->twsk_obj_size,
3ab5aee7 2848 0,
52db70dc 2849 prot->slab_flags,
20c2df83 2850 NULL);
6d6ee43e 2851 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2852 goto out_free_timewait_sock_slab_name;
2853 }
1da177e4
LT		 2854 }
2855
36b77a52 2856 mutex_lock(&proto_list_mutex);
1da177e4 2857 list_add(&prot->node, &proto_list);
13ff3d6f 2858 assign_proto_idx(prot);
36b77a52 2859 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2860 return 0;
2861
8feaf0c0 2862out_free_timewait_sock_slab_name:
7e56b5d6 2863 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0 2864out_free_request_sock_slab:
0159dfd3
ED		 2865 req_prot_cleanup(prot->rsk_prot);
2866
2e6599cb
ACM		 2867 kmem_cache_destroy(prot->slab);
2868 prot->slab = NULL;
b733c007
PE		 2869out:
2870 return -ENOBUFS;
1da177e4 2871}
1da177e4
LT		 2872EXPORT_SYMBOL(proto_register);
2873
2874void proto_unregister(struct proto *prot)
2875{
36b77a52 2876 mutex_lock(&proto_list_mutex);
13ff3d6f 2877 release_proto_idx(prot);
0a3f4358 2878 list_del(&prot->node);
36b77a52 2879 mutex_unlock(&proto_list_mutex);
1da177e4 2880
adf78eda
JL		 2881 kmem_cache_destroy(prot->slab);
2882 prot->slab = NULL;
1da177e4 2883
0159dfd3 2884 req_prot_cleanup(prot->rsk_prot);
2e6599cb 2885
6d6ee43e 2886 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2887 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2888 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2889 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2890 }
1da177e4 2891}
1da177e4
LT		 2892EXPORT_SYMBOL(proto_unregister);
2893
2894#ifdef CONFIG_PROC_FS
1da177e4 2895static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2896 __acquires(proto_list_mutex)
1da177e4 2897{
36b77a52 2898 mutex_lock(&proto_list_mutex);
60f0438a 2899 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2900}
2901
2902static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2903{
60f0438a 2904 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2905}
2906
2907static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2908 __releases(proto_list_mutex)
1da177e4 2909{
36b77a52 2910 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2911}
2912
2913static char proto_method_implemented(const void *method)
2914{
2915 return method == NULL ? 'n' : 'y';
2916}
180d8cd9
GC		 2917static long sock_prot_memory_allocated(struct proto *proto)
2918{
cb75a36c 2919 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2920}
2921
2922static char *sock_prot_memory_pressure(struct proto *proto)
2923{
2924 return proto->memory_pressure != NULL ?
2925 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2926}
1da177e4
LT		 2927
2928static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2929{
180d8cd9 2930
8d987e5c 2931 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2932 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2933 proto->name,
2934 proto->obj_size,
14e943db 2935 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2936 sock_prot_memory_allocated(proto),
2937 sock_prot_memory_pressure(proto),
1da177e4
LT		 2938 proto->max_header,
2939 proto->slab == NULL ? "no" : "yes",
2940 module_name(proto->owner),
2941 proto_method_implemented(proto->close),
2942 proto_method_implemented(proto->connect),
2943 proto_method_implemented(proto->disconnect),
2944 proto_method_implemented(proto->accept),
2945 proto_method_implemented(proto->ioctl),
2946 proto_method_implemented(proto->init),
2947 proto_method_implemented(proto->destroy),
2948 proto_method_implemented(proto->shutdown),
2949 proto_method_implemented(proto->setsockopt),
2950 proto_method_implemented(proto->getsockopt),
2951 proto_method_implemented(proto->sendmsg),
2952 proto_method_implemented(proto->recvmsg),
2953 proto_method_implemented(proto->sendpage),
2954 proto_method_implemented(proto->bind),
2955 proto_method_implemented(proto->backlog_rcv),
2956 proto_method_implemented(proto->hash),
2957 proto_method_implemented(proto->unhash),
2958 proto_method_implemented(proto->get_port),
2959 proto_method_implemented(proto->enter_memory_pressure));
2960}
2961
2962static int proto_seq_show(struct seq_file *seq, void *v)
2963{
60f0438a 2964 if (v == &proto_list)
1da177e4
LT		 2965 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2966 "protocol",
2967 "size",
2968 "sockets",
2969 "memory",
2970 "press",
2971 "maxhdr",
2972 "slab",
2973 "module",
2974 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2975 else
60f0438a 2976 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2977 return 0;
2978}
2979
f690808e 2980static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2981 .start = proto_seq_start,
2982 .next = proto_seq_next,
2983 .stop = proto_seq_stop,
2984 .show = proto_seq_show,
2985};
2986
2987static int proto_seq_open(struct inode *inode, struct file *file)
2988{
14e943db
ED		 2989 return seq_open_net(inode, file, &proto_seq_ops,
2990 sizeof(struct seq_net_private));
1da177e4
LT		 2991}
2992
9a32144e 2993static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2994 .owner = THIS_MODULE,
2995 .open = proto_seq_open,
2996 .read = seq_read,
2997 .llseek = seq_lseek,
14e943db
ED		 2998 .release = seq_release_net,
2999};
3000
3001static __net_init int proto_init_net(struct net *net)
3002{
d4beaa66 3003 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 3004 return -ENOMEM;
3005
3006 return 0;
3007}
3008
3009static __net_exit void proto_exit_net(struct net *net)
3010{
ece31ffd 3011 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 3012}
3013
3014
3015static __net_initdata struct pernet_operations proto_net_ops = {
3016 .init = proto_init_net,
3017 .exit = proto_exit_net,
1da177e4
LT		 3018};
3019
3020static int __init proto_init(void)
3021{
14e943db 3022 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 3023}
3024
3025subsys_initcall(proto_init);
3026
3027#endif /* PROC_FS */
Linux kernel - Deliverables
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