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geneve: avoid use-after-free of skb->data
[linux-2.6-block.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
e6afc8ac 408int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
f0088a50 409{
3b885787
NH		 410 unsigned long flags;
411 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 412
0fd7bac6 413 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 414 atomic_inc(&sk->sk_drops);
3847ce32 415 trace_sock_rcvqueue_full(sk, skb);
766e9037 416 return -ENOMEM;
f0088a50
DV		 417 }
418
c76562b6 419 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 420 atomic_inc(&sk->sk_drops);
421 return -ENOBUFS;
3ab224be
HA		 422 }
423
f0088a50
DV		 424 skb->dev = NULL;
425 skb_set_owner_r(skb, sk);
49ad9599 426
7fee226a
ED		 427 /* we escape from rcu protected region, make sure we dont leak
428 * a norefcounted dst
429 */
430 skb_dst_force(skb);
431
3b885787 432 spin_lock_irqsave(&list->lock, flags);
3bc3b96f 433 sock_skb_set_dropcount(sk, skb);
3b885787
NH		 434 __skb_queue_tail(list, skb);
435 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 436
437 if (!sock_flag(sk, SOCK_DEAD))
676d2369 438 sk->sk_data_ready(sk);
766e9037 439 return 0;
f0088a50 440}
e6afc8ac 441EXPORT_SYMBOL(__sock_queue_rcv_skb);
442
443int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
444{
445 int err;
446
447 err = sk_filter(sk, skb);
448 if (err)
449 return err;
450
451 return __sock_queue_rcv_skb(sk, skb);
452}
f0088a50
DV		 453EXPORT_SYMBOL(sock_queue_rcv_skb);
454
4f0c40d9 455int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
c3f24cfb 456 const int nested, unsigned int trim_cap, bool refcounted)
f0088a50
DV		 457{
458 int rc = NET_RX_SUCCESS;
459
4f0c40d9 460 if (sk_filter_trim_cap(sk, skb, trim_cap))
f0088a50
DV		 461 goto discard_and_relse;
462
463 skb->dev = NULL;
464
274f482d 465 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 466 atomic_inc(&sk->sk_drops);
467 goto discard_and_relse;
468 }
58a5a7b9
ACM		 469 if (nested)
470 bh_lock_sock_nested(sk);
471 else
472 bh_lock_sock(sk);
a5b5bb9a
IM		 473 if (!sock_owned_by_user(sk)) {
474 /*
475 * trylock + unlock semantics:
476 */
477 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
478
c57943a1 479 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 480
481 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 482 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 483 bh_unlock_sock(sk);
484 atomic_inc(&sk->sk_drops);
485 goto discard_and_relse;
486 }
487
f0088a50
DV		 488 bh_unlock_sock(sk);
489out:
c3f24cfb
ED		 490 if (refcounted)
491 sock_put(sk);
f0088a50
DV		 492 return rc;
493discard_and_relse:
494 kfree_skb(skb);
495 goto out;
496}
4f0c40d9 497EXPORT_SYMBOL(__sk_receive_skb);
f0088a50
DV		 498
499struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
500{
b6c6712a 501 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 502
503 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 504 sk_tx_queue_clear(sk);
a9b3cd7f 505 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 506 dst_release(dst);
507 return NULL;
508 }
509
510 return dst;
511}
512EXPORT_SYMBOL(__sk_dst_check);
513
514struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
515{
516 struct dst_entry *dst = sk_dst_get(sk);
517
518 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
519 sk_dst_reset(sk);
520 dst_release(dst);
521 return NULL;
522 }
523
524 return dst;
525}
526EXPORT_SYMBOL(sk_dst_check);
527
c91f6df2
BH		 528static int sock_setbindtodevice(struct sock *sk, char __user *optval,
529 int optlen)
4878809f
DM		 530{
531 int ret = -ENOPROTOOPT;
532#ifdef CONFIG_NETDEVICES
3b1e0a65 533 struct net *net = sock_net(sk);
4878809f
DM		 534 char devname[IFNAMSIZ];
535 int index;
536
537 /* Sorry... */
538 ret = -EPERM;
5e1fccc0 539 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 540 goto out;
541
542 ret = -EINVAL;
543 if (optlen < 0)
544 goto out;
545
546 /* Bind this socket to a particular device like "eth0",
547 * as specified in the passed interface name. If the
548 * name is "" or the option length is zero the socket
549 * is not bound.
550 */
551 if (optlen > IFNAMSIZ - 1)
552 optlen = IFNAMSIZ - 1;
553 memset(devname, 0, sizeof(devname));
554
555 ret = -EFAULT;
556 if (copy_from_user(devname, optval, optlen))
557 goto out;
558
000ba2e4
DM		 559 index = 0;
560 if (devname[0] != '\0') {
bf8e56bf 561 struct net_device *dev;
4878809f 562
bf8e56bf
ED		 563 rcu_read_lock();
564 dev = dev_get_by_name_rcu(net, devname);
565 if (dev)
566 index = dev->ifindex;
567 rcu_read_unlock();
4878809f
DM		 568 ret = -ENODEV;
569 if (!dev)
570 goto out;
4878809f
DM		 571 }
572
573 lock_sock(sk);
574 sk->sk_bound_dev_if = index;
575 sk_dst_reset(sk);
576 release_sock(sk);
577
578 ret = 0;
579
580out:
581#endif
582
583 return ret;
584}
585
c91f6df2
BH		 586static int sock_getbindtodevice(struct sock *sk, char __user *optval,
587 int __user *optlen, int len)
588{
589 int ret = -ENOPROTOOPT;
590#ifdef CONFIG_NETDEVICES
591 struct net *net = sock_net(sk);
c91f6df2 592 char devname[IFNAMSIZ];
c91f6df2
BH		 593
594 if (sk->sk_bound_dev_if == 0) {
595 len = 0;
596 goto zero;
597 }
598
599 ret = -EINVAL;
600 if (len < IFNAMSIZ)
601 goto out;
602
5dbe7c17
NS		 603 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
604 if (ret)
c91f6df2 605 goto out;
c91f6df2
BH		 606
607 len = strlen(devname) + 1;
608
609 ret = -EFAULT;
610 if (copy_to_user(optval, devname, len))
611 goto out;
612
613zero:
614 ret = -EFAULT;
615 if (put_user(len, optlen))
616 goto out;
617
618 ret = 0;
619
620out:
621#endif
622
623 return ret;
624}
625
c0ef877b
PE		 626static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
627{
628 if (valbool)
629 sock_set_flag(sk, bit);
630 else
631 sock_reset_flag(sk, bit);
632}
633
f60e5990 634bool sk_mc_loop(struct sock *sk)
635{
636 if (dev_recursion_level())
637 return false;
638 if (!sk)
639 return true;
640 switch (sk->sk_family) {
641 case AF_INET:
642 return inet_sk(sk)->mc_loop;
643#if IS_ENABLED(CONFIG_IPV6)
644 case AF_INET6:
645 return inet6_sk(sk)->mc_loop;
646#endif
647 }
648 WARN_ON(1);
649 return true;
650}
651EXPORT_SYMBOL(sk_mc_loop);
652
1da177e4
LT		 653/*
654 * This is meant for all protocols to use and covers goings on
655 * at the socket level. Everything here is generic.
656 */
657
658int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 659 char __user *optval, unsigned int optlen)
1da177e4 660{
2a91525c 661 struct sock *sk = sock->sk;
1da177e4
LT		 662 int val;
663 int valbool;
664 struct linger ling;
665 int ret = 0;
4ec93edb 666
1da177e4
LT		 667 /*
668 * Options without arguments
669 */
670
4878809f 671 if (optname == SO_BINDTODEVICE)
c91f6df2 672 return sock_setbindtodevice(sk, optval, optlen);
4878809f 673
e71a4783
SH		 674 if (optlen < sizeof(int))
675 return -EINVAL;
4ec93edb 676
1da177e4
LT		 677 if (get_user(val, (int __user *)optval))
678 return -EFAULT;
4ec93edb 679
2a91525c 680 valbool = val ? 1 : 0;
1da177e4
LT		 681
682 lock_sock(sk);
683
2a91525c 684 switch (optname) {
e71a4783 685 case SO_DEBUG:
2a91525c 686 if (val && !capable(CAP_NET_ADMIN))
e71a4783 687 ret = -EACCES;
2a91525c 688 else
c0ef877b 689 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 690 break;
691 case SO_REUSEADDR:
4a17fd52 692 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 693 break;
055dc21a
TH		 694 case SO_REUSEPORT:
695 sk->sk_reuseport = valbool;
696 break;
e71a4783 697 case SO_TYPE:
49c794e9 698 case SO_PROTOCOL:
0d6038ee 699 case SO_DOMAIN:
e71a4783
SH		 700 case SO_ERROR:
701 ret = -ENOPROTOOPT;
702 break;
703 case SO_DONTROUTE:
c0ef877b 704 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 705 break;
706 case SO_BROADCAST:
707 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
708 break;
709 case SO_SNDBUF:
710 /* Don't error on this BSD doesn't and if you think
82981930
ED		 711 * about it this is right. Otherwise apps have to
712 * play 'guess the biggest size' games. RCVBUF/SNDBUF
713 * are treated in BSD as hints
714 */
715 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 716set_sndbuf:
e71a4783 717 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 718 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
719 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 720 sk->sk_write_space(sk);
721 break;
1da177e4 722
e71a4783
SH		 723 case SO_SNDBUFFORCE:
724 if (!capable(CAP_NET_ADMIN)) {
725 ret = -EPERM;
726 break;
727 }
728 goto set_sndbuf;
b0573dea 729
e71a4783
SH		 730 case SO_RCVBUF:
731 /* Don't error on this BSD doesn't and if you think
82981930
ED		 732 * about it this is right. Otherwise apps have to
733 * play 'guess the biggest size' games. RCVBUF/SNDBUF
734 * are treated in BSD as hints
735 */
736 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 737set_rcvbuf:
e71a4783
SH		 738 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
739 /*
740 * We double it on the way in to account for
741 * "struct sk_buff" etc. overhead. Applications
742 * assume that the SO_RCVBUF setting they make will
743 * allow that much actual data to be received on that
744 * socket.
745 *
746 * Applications are unaware that "struct sk_buff" and
747 * other overheads allocate from the receive buffer
748 * during socket buffer allocation.
749 *
750 * And after considering the possible alternatives,
751 * returning the value we actually used in getsockopt
752 * is the most desirable behavior.
753 */
82981930 754 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 755 break;
756
757 case SO_RCVBUFFORCE:
758 if (!capable(CAP_NET_ADMIN)) {
759 ret = -EPERM;
1da177e4 760 break;
e71a4783
SH		 761 }
762 goto set_rcvbuf;
1da177e4 763
e71a4783 764 case SO_KEEPALIVE:
1da177e4 765#ifdef CONFIG_INET
3e10986d
ED		 766 if (sk->sk_protocol == IPPROTO_TCP &&
767 sk->sk_type == SOCK_STREAM)
e71a4783 768 tcp_set_keepalive(sk, valbool);
1da177e4 769#endif
e71a4783
SH		 770 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
771 break;
772
773 case SO_OOBINLINE:
774 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
775 break;
776
777 case SO_NO_CHECK:
28448b80 778 sk->sk_no_check_tx = valbool;
e71a4783
SH		 779 break;
780
781 case SO_PRIORITY:
5e1fccc0
EB		 782 if ((val >= 0 && val <= 6) ||
783 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 784 sk->sk_priority = val;
785 else
786 ret = -EPERM;
787 break;
788
789 case SO_LINGER:
790 if (optlen < sizeof(ling)) {
791 ret = -EINVAL; /* 1003.1g */
1da177e4 792 break;
e71a4783 793 }
2a91525c 794 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 795 ret = -EFAULT;
1da177e4 796 break;
e71a4783
SH		 797 }
798 if (!ling.l_onoff)
799 sock_reset_flag(sk, SOCK_LINGER);
800 else {
1da177e4 801#if (BITS_PER_LONG == 32)
e71a4783
SH		 802 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
803 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 804 else
e71a4783
SH		 805#endif
806 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
807 sock_set_flag(sk, SOCK_LINGER);
808 }
809 break;
810
811 case SO_BSDCOMPAT:
812 sock_warn_obsolete_bsdism("setsockopt");
813 break;
814
815 case SO_PASSCRED:
816 if (valbool)
817 set_bit(SOCK_PASSCRED, &sock->flags);
818 else
819 clear_bit(SOCK_PASSCRED, &sock->flags);
820 break;
821
822 case SO_TIMESTAMP:
92f37fd2 823 case SO_TIMESTAMPNS:
e71a4783 824 if (valbool) {
92f37fd2
ED		 825 if (optname == SO_TIMESTAMP)
826 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
827 else
828 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 829 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 830 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 831 } else {
e71a4783 832 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 833 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
834 }
e71a4783
SH		 835 break;
836
20d49473
PO		 837 case SO_TIMESTAMPING:
838 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 839 ret = -EINVAL;
20d49473
PO		 840 break;
841 }
b245be1f 842
09c2d251 843 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765 844 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
ac5cc977
WC		 845 if (sk->sk_protocol == IPPROTO_TCP &&
846 sk->sk_type == SOCK_STREAM) {
6db8b963
SHY		 847 if ((1 << sk->sk_state) &
848 (TCPF_CLOSE | TCPF_LISTEN)) {
4ed2d765
WB		 849 ret = -EINVAL;
850 break;
851 }
852 sk->sk_tskey = tcp_sk(sk)->snd_una;
853 } else {
854 sk->sk_tskey = 0;
855 }
856 }
b9f40e21 857 sk->sk_tsflags = val;
20d49473
PO		 858 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
859 sock_enable_timestamp(sk,
860 SOCK_TIMESTAMPING_RX_SOFTWARE);
861 else
862 sock_disable_timestamp(sk,
08e29af3 863 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 864 break;
865
e71a4783
SH		 866 case SO_RCVLOWAT:
867 if (val < 0)
868 val = INT_MAX;
869 sk->sk_rcvlowat = val ? : 1;
870 break;
871
872 case SO_RCVTIMEO:
873 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
874 break;
875
876 case SO_SNDTIMEO:
877 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
878 break;
1da177e4 879
e71a4783
SH		 880 case SO_ATTACH_FILTER:
881 ret = -EINVAL;
882 if (optlen == sizeof(struct sock_fprog)) {
883 struct sock_fprog fprog;
1da177e4 884
e71a4783
SH		 885 ret = -EFAULT;
886 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 887 break;
e71a4783
SH		 888
889 ret = sk_attach_filter(&fprog, sk);
890 }
891 break;
892
89aa0758
AS		 893 case SO_ATTACH_BPF:
894 ret = -EINVAL;
895 if (optlen == sizeof(u32)) {
896 u32 ufd;
897
898 ret = -EFAULT;
899 if (copy_from_user(&ufd, optval, sizeof(ufd)))
900 break;
901
902 ret = sk_attach_bpf(ufd, sk);
903 }
904 break;
905
538950a1
CG		 906 case SO_ATTACH_REUSEPORT_CBPF:
907 ret = -EINVAL;
908 if (optlen == sizeof(struct sock_fprog)) {
909 struct sock_fprog fprog;
910
911 ret = -EFAULT;
912 if (copy_from_user(&fprog, optval, sizeof(fprog)))
913 break;
914
915 ret = sk_reuseport_attach_filter(&fprog, sk);
916 }
917 break;
918
919 case SO_ATTACH_REUSEPORT_EBPF:
920 ret = -EINVAL;
921 if (optlen == sizeof(u32)) {
922 u32 ufd;
923
924 ret = -EFAULT;
925 if (copy_from_user(&ufd, optval, sizeof(ufd)))
926 break;
927
928 ret = sk_reuseport_attach_bpf(ufd, sk);
929 }
930 break;
931
e71a4783 932 case SO_DETACH_FILTER:
55b33325 933 ret = sk_detach_filter(sk);
e71a4783 934 break;
1da177e4 935
d59577b6
VB		 936 case SO_LOCK_FILTER:
937 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
938 ret = -EPERM;
939 else
940 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
941 break;
942
e71a4783
SH		 943 case SO_PASSSEC:
944 if (valbool)
945 set_bit(SOCK_PASSSEC, &sock->flags);
946 else
947 clear_bit(SOCK_PASSSEC, &sock->flags);
948 break;
4a19ec58 949 case SO_MARK:
5e1fccc0 950 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 951 ret = -EPERM;
2a91525c 952 else
4a19ec58 953 sk->sk_mark = val;
4a19ec58 954 break;
877ce7c1 955
3b885787 956 case SO_RXQ_OVFL:
8083f0fc 957 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 958 break;
6e3e939f
JB		 959
960 case SO_WIFI_STATUS:
961 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
962 break;
963
ef64a54f
PE		 964 case SO_PEEK_OFF:
965 if (sock->ops->set_peek_off)
12663bfc 966 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 967 else
968 ret = -EOPNOTSUPP;
969 break;
3bdc0eba
BG		 970
971 case SO_NOFCS:
972 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
973 break;
974
7d4c04fc
KJ		 975 case SO_SELECT_ERR_QUEUE:
976 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
977 break;
978
e0d1095a 979#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 980 case SO_BUSY_POLL:
dafcc438
ET		 981 /* allow unprivileged users to decrease the value */
982 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
983 ret = -EPERM;
984 else {
985 if (val < 0)
986 ret = -EINVAL;
987 else
988 sk->sk_ll_usec = val;
989 }
990 break;
991#endif
62748f32
ED		 992
993 case SO_MAX_PACING_RATE:
994 sk->sk_max_pacing_rate = val;
995 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
996 sk->sk_max_pacing_rate);
997 break;
998
70da268b
ED		 999 case SO_INCOMING_CPU:
1000 sk->sk_incoming_cpu = val;
1001 break;
1002
a87cb3e4
TH		 1003 case SO_CNX_ADVICE:
1004 if (val == 1)
1005 dst_negative_advice(sk);
1006 break;
e71a4783
SH		 1007 default:
1008 ret = -ENOPROTOOPT;
1009 break;
4ec93edb 1010 }
1da177e4
LT		 1011 release_sock(sk);
1012 return ret;
1013}
2a91525c 1014EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 1015
1016
8f09898b 1017static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1018 struct ucred *ucred)
3f551f94
EB		 1019{
1020 ucred->pid = pid_vnr(pid);
1021 ucred->uid = ucred->gid = -1;
1022 if (cred) {
1023 struct user_namespace *current_ns = current_user_ns();
1024
b2e4f544
EB		 1025 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1026 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 1027 }
1028}
1029
1da177e4
LT		 1030int sock_getsockopt(struct socket *sock, int level, int optname,
1031 char __user *optval, int __user *optlen)
1032{
1033 struct sock *sk = sock->sk;
4ec93edb 1034
e71a4783 1035 union {
4ec93edb
YH		 1036 int val;
1037 struct linger ling;
1da177e4
LT		 1038 struct timeval tm;
1039 } v;
4ec93edb 1040
4d0392be 1041 int lv = sizeof(int);
1da177e4 1042 int len;
4ec93edb 1043
e71a4783 1044 if (get_user(len, optlen))
4ec93edb 1045 return -EFAULT;
e71a4783 1046 if (len < 0)
1da177e4 1047 return -EINVAL;
4ec93edb 1048
50fee1de 1049 memset(&v, 0, sizeof(v));
df0bca04 1050
2a91525c 1051 switch (optname) {
e71a4783
SH		 1052 case SO_DEBUG:
1053 v.val = sock_flag(sk, SOCK_DBG);
1054 break;
1055
1056 case SO_DONTROUTE:
1057 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1058 break;
1059
1060 case SO_BROADCAST:
1b23a5df 1061 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1062 break;
1063
1064 case SO_SNDBUF:
1065 v.val = sk->sk_sndbuf;
1066 break;
1067
1068 case SO_RCVBUF:
1069 v.val = sk->sk_rcvbuf;
1070 break;
1071
1072 case SO_REUSEADDR:
1073 v.val = sk->sk_reuse;
1074 break;
1075
055dc21a
TH		 1076 case SO_REUSEPORT:
1077 v.val = sk->sk_reuseport;
1078 break;
1079
e71a4783 1080 case SO_KEEPALIVE:
1b23a5df 1081 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1082 break;
1083
1084 case SO_TYPE:
1085 v.val = sk->sk_type;
1086 break;
1087
49c794e9
JE		 1088 case SO_PROTOCOL:
1089 v.val = sk->sk_protocol;
1090 break;
1091
0d6038ee
JE		 1092 case SO_DOMAIN:
1093 v.val = sk->sk_family;
1094 break;
1095
e71a4783
SH		 1096 case SO_ERROR:
1097 v.val = -sock_error(sk);
2a91525c 1098 if (v.val == 0)
e71a4783
SH		 1099 v.val = xchg(&sk->sk_err_soft, 0);
1100 break;
1101
1102 case SO_OOBINLINE:
1b23a5df 1103 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1104 break;
1105
1106 case SO_NO_CHECK:
28448b80 1107 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1108 break;
1109
1110 case SO_PRIORITY:
1111 v.val = sk->sk_priority;
1112 break;
1113
1114 case SO_LINGER:
1115 lv = sizeof(v.ling);
1b23a5df 1116 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1117 v.ling.l_linger = sk->sk_lingertime / HZ;
1118 break;
1119
1120 case SO_BSDCOMPAT:
1121 sock_warn_obsolete_bsdism("getsockopt");
1122 break;
1123
1124 case SO_TIMESTAMP:
92f37fd2
ED		 1125 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1126 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1127 break;
1128
1129 case SO_TIMESTAMPNS:
1130 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1131 break;
1132
20d49473 1133 case SO_TIMESTAMPING:
b9f40e21 1134 v.val = sk->sk_tsflags;
20d49473
PO		 1135 break;
1136
e71a4783 1137 case SO_RCVTIMEO:
2a91525c 1138 lv = sizeof(struct timeval);
e71a4783
SH		 1139 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1140 v.tm.tv_sec = 0;
1141 v.tm.tv_usec = 0;
1142 } else {
1143 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1144 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1145 }
1146 break;
1147
1148 case SO_SNDTIMEO:
2a91525c 1149 lv = sizeof(struct timeval);
e71a4783
SH		 1150 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1151 v.tm.tv_sec = 0;
1152 v.tm.tv_usec = 0;
1153 } else {
1154 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1155 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1156 }
1157 break;
1da177e4 1158
e71a4783
SH		 1159 case SO_RCVLOWAT:
1160 v.val = sk->sk_rcvlowat;
1161 break;
1da177e4 1162
e71a4783 1163 case SO_SNDLOWAT:
2a91525c 1164 v.val = 1;
e71a4783 1165 break;
1da177e4 1166
e71a4783 1167 case SO_PASSCRED:
82981930 1168 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1169 break;
1da177e4 1170
e71a4783 1171 case SO_PEERCRED:
109f6e39
EB		 1172 {
1173 struct ucred peercred;
1174 if (len > sizeof(peercred))
1175 len = sizeof(peercred);
1176 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1177 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1178 return -EFAULT;
1179 goto lenout;
109f6e39 1180 }
1da177e4 1181
e71a4783
SH		 1182 case SO_PEERNAME:
1183 {
1184 char address[128];
1185
1186 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1187 return -ENOTCONN;
1188 if (lv < len)
1189 return -EINVAL;
1190 if (copy_to_user(optval, address, len))
1191 return -EFAULT;
1192 goto lenout;
1193 }
1da177e4 1194
e71a4783
SH		 1195 /* Dubious BSD thing... Probably nobody even uses it, but
1196 * the UNIX standard wants it for whatever reason... -DaveM
1197 */
1198 case SO_ACCEPTCONN:
1199 v.val = sk->sk_state == TCP_LISTEN;
1200 break;
1da177e4 1201
e71a4783 1202 case SO_PASSSEC:
82981930 1203 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1204 break;
877ce7c1 1205
e71a4783
SH		 1206 case SO_PEERSEC:
1207 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1208
4a19ec58
LAT		 1209 case SO_MARK:
1210 v.val = sk->sk_mark;
1211 break;
1212
3b885787 1213 case SO_RXQ_OVFL:
1b23a5df 1214 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1215 break;
1216
6e3e939f 1217 case SO_WIFI_STATUS:
1b23a5df 1218 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1219 break;
1220
ef64a54f
PE		 1221 case SO_PEEK_OFF:
1222 if (!sock->ops->set_peek_off)
1223 return -EOPNOTSUPP;
1224
1225 v.val = sk->sk_peek_off;
1226 break;
bc2f7996 1227 case SO_NOFCS:
1b23a5df 1228 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1229 break;
c91f6df2 1230
f7b86bfe 1231 case SO_BINDTODEVICE:
c91f6df2
BH		 1232 return sock_getbindtodevice(sk, optval, optlen, len);
1233
a8fc9277
PE		 1234 case SO_GET_FILTER:
1235 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1236 if (len < 0)
1237 return len;
1238
1239 goto lenout;
c91f6df2 1240
d59577b6
VB		 1241 case SO_LOCK_FILTER:
1242 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1243 break;
1244
ea02f941
MS		 1245 case SO_BPF_EXTENSIONS:
1246 v.val = bpf_tell_extensions();
1247 break;
1248
7d4c04fc
KJ		 1249 case SO_SELECT_ERR_QUEUE:
1250 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1251 break;
1252
e0d1095a 1253#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1254 case SO_BUSY_POLL:
dafcc438
ET		 1255 v.val = sk->sk_ll_usec;
1256 break;
1257#endif
1258
62748f32
ED		 1259 case SO_MAX_PACING_RATE:
1260 v.val = sk->sk_max_pacing_rate;
1261 break;
1262
2c8c56e1
ED		 1263 case SO_INCOMING_CPU:
1264 v.val = sk->sk_incoming_cpu;
1265 break;
1266
e71a4783 1267 default:
443b5991
YH		 1268 /* We implement the SO_SNDLOWAT etc to not be settable
1269 * (1003.1g 7).
1270 */
e71a4783 1271 return -ENOPROTOOPT;
1da177e4 1272 }
e71a4783 1273
1da177e4
LT		 1274 if (len > lv)
1275 len = lv;
1276 if (copy_to_user(optval, &v, len))
1277 return -EFAULT;
1278lenout:
4ec93edb
YH		 1279 if (put_user(len, optlen))
1280 return -EFAULT;
1281 return 0;
1da177e4
LT		 1282}
1283
a5b5bb9a
IM		 1284/*
1285 * Initialize an sk_lock.
1286 *
1287 * (We also register the sk_lock with the lock validator.)
1288 */
b6f99a21 1289static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1290{
ed07536e
PZ		 1291 sock_lock_init_class_and_name(sk,
1292 af_family_slock_key_strings[sk->sk_family],
1293 af_family_slock_keys + sk->sk_family,
1294 af_family_key_strings[sk->sk_family],
1295 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1296}
1297
4dc6dc71
ED		 1298/*
1299 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1300 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1301 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1302 */
f1a6c4da
PE		 1303static void sock_copy(struct sock *nsk, const struct sock *osk)
1304{
1305#ifdef CONFIG_SECURITY_NETWORK
1306 void *sptr = nsk->sk_security;
1307#endif
68835aba
ED		 1308 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1309
1310 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1311 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1312
f1a6c4da
PE		 1313#ifdef CONFIG_SECURITY_NETWORK
1314 nsk->sk_security = sptr;
1315 security_sk_clone(osk, nsk);
1316#endif
1317}
1318
2e4afe7b
PE		 1319static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1320 int family)
c308c1b2
PE		 1321{
1322 struct sock *sk;
1323 struct kmem_cache *slab;
1324
1325 slab = prot->slab;
e912b114
ED		 1326 if (slab != NULL) {
1327 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1328 if (!sk)
1329 return sk;
ba2489b0
ED		 1330 if (priority & __GFP_ZERO)
1331 sk_prot_clear_nulls(sk, prot->obj_size);
fcbdf09d 1332 } else
c308c1b2
PE		 1333 sk = kmalloc(prot->obj_size, priority);
1334
2e4afe7b 1335 if (sk != NULL) {
a98b65a3
VN		 1336 kmemcheck_annotate_bitfield(sk, flags);
1337
2e4afe7b
PE		 1338 if (security_sk_alloc(sk, family, priority))
1339 goto out_free;
1340
1341 if (!try_module_get(prot->owner))
1342 goto out_free_sec;
e022f0b4 1343 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1344 }
1345
c308c1b2 1346 return sk;
2e4afe7b
PE		 1347
1348out_free_sec:
1349 security_sk_free(sk);
1350out_free:
1351 if (slab != NULL)
1352 kmem_cache_free(slab, sk);
1353 else
1354 kfree(sk);
1355 return NULL;
c308c1b2
PE		 1356}
1357
1358static void sk_prot_free(struct proto *prot, struct sock *sk)
1359{
1360 struct kmem_cache *slab;
2e4afe7b 1361 struct module *owner;
c308c1b2 1362
2e4afe7b 1363 owner = prot->owner;
c308c1b2 1364 slab = prot->slab;
2e4afe7b 1365
bd1060a1 1366 cgroup_sk_free(&sk->sk_cgrp_data);
2d758073 1367 mem_cgroup_sk_free(sk);
2e4afe7b 1368 security_sk_free(sk);
c308c1b2
PE		 1369 if (slab != NULL)
1370 kmem_cache_free(slab, sk);
1371 else
1372 kfree(sk);
2e4afe7b 1373 module_put(owner);
c308c1b2
PE		 1374}
1375
1da177e4
LT		 1376/**
1377 * sk_alloc - All socket objects are allocated here
c4ea43c5 1378 * @net: the applicable net namespace
4dc3b16b
PP		 1379 * @family: protocol family
1380 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1381 * @prot: struct proto associated with this new sock instance
11aa9c28 1382 * @kern: is this to be a kernel socket?
1da177e4 1383 */
1b8d7ae4 1384struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
11aa9c28 1385 struct proto *prot, int kern)
1da177e4 1386{
c308c1b2 1387 struct sock *sk;
1da177e4 1388
154adbc8 1389 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1390 if (sk) {
154adbc8
PE		 1391 sk->sk_family = family;
1392 /*
1393 * See comment in struct sock definition to understand
1394 * why we need sk_prot_creator -acme
1395 */
1396 sk->sk_prot = sk->sk_prot_creator = prot;
1397 sock_lock_init(sk);
26abe143
EB		 1398 sk->sk_net_refcnt = kern ? 0 : 1;
1399 if (likely(sk->sk_net_refcnt))
1400 get_net(net);
1401 sock_net_set(sk, net);
d66ee058 1402 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1403
2d758073 1404 mem_cgroup_sk_alloc(sk);
d979a39d 1405 cgroup_sk_alloc(&sk->sk_cgrp_data);
2a56a1fe
TH		 1406 sock_update_classid(&sk->sk_cgrp_data);
1407 sock_update_netprioidx(&sk->sk_cgrp_data);
1da177e4 1408 }
a79af59e 1409
2e4afe7b 1410 return sk;
1da177e4 1411}
2a91525c 1412EXPORT_SYMBOL(sk_alloc);
1da177e4 1413
a4298e45
ED		 1414/* Sockets having SOCK_RCU_FREE will call this function after one RCU
1415 * grace period. This is the case for UDP sockets and TCP listeners.
1416 */
1417static void __sk_destruct(struct rcu_head *head)
1da177e4 1418{
a4298e45 1419 struct sock *sk = container_of(head, struct sock, sk_rcu);
1da177e4 1420 struct sk_filter *filter;
1da177e4
LT		 1421
1422 if (sk->sk_destruct)
1423 sk->sk_destruct(sk);
1424
a898def2
PM		 1425 filter = rcu_dereference_check(sk->sk_filter,
1426 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1427 if (filter) {
309dd5fc 1428 sk_filter_uncharge(sk, filter);
a9b3cd7f 1429 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4 1430 }
538950a1
CG		 1431 if (rcu_access_pointer(sk->sk_reuseport_cb))
1432 reuseport_detach_sock(sk);
1da177e4 1433
08e29af3 1434 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1435
1436 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1437 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1438 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1439
109f6e39
EB		 1440 if (sk->sk_peer_cred)
1441 put_cred(sk->sk_peer_cred);
1442 put_pid(sk->sk_peer_pid);
26abe143
EB		 1443 if (likely(sk->sk_net_refcnt))
1444 put_net(sock_net(sk));
c308c1b2 1445 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1446}
2b85a34e 1447
a4298e45
ED		 1448void sk_destruct(struct sock *sk)
1449{
1450 if (sock_flag(sk, SOCK_RCU_FREE))
1451 call_rcu(&sk->sk_rcu, __sk_destruct);
1452 else
1453 __sk_destruct(&sk->sk_rcu);
1454}
1455
eb4cb008
CG		 1456static void __sk_free(struct sock *sk)
1457{
b922622e 1458 if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt))
eb4cb008
CG		 1459 sock_diag_broadcast_destroy(sk);
1460 else
1461 sk_destruct(sk);
1462}
1463
2b85a34e
ED		 1464void sk_free(struct sock *sk)
1465{
1466 /*
25985edc 1467 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1468 * some packets are still in some tx queue.
1469 * If not null, sock_wfree() will call __sk_free(sk) later
1470 */
1471 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1472 __sk_free(sk);
1473}
2a91525c 1474EXPORT_SYMBOL(sk_free);
1da177e4 1475
e56c57d0
ED		 1476/**
1477 * sk_clone_lock - clone a socket, and lock its clone
1478 * @sk: the socket to clone
1479 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1480 *
1481 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1482 */
1483struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1484{
8fd1d178 1485 struct sock *newsk;
278571ba 1486 bool is_charged = true;
87d11ceb 1487
8fd1d178 1488 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1489 if (newsk != NULL) {
1490 struct sk_filter *filter;
1491
892c141e 1492 sock_copy(newsk, sk);
87d11ceb
ACM		 1493
1494 /* SANITY */
8a681736
SV		 1495 if (likely(newsk->sk_net_refcnt))
1496 get_net(sock_net(newsk));
87d11ceb
ACM		 1497 sk_node_init(&newsk->sk_node);
1498 sock_lock_init(newsk);
1499 bh_lock_sock(newsk);
fa438ccf 1500 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1501 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1502
1503 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1504 /*
1505 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1506 */
1507 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1508 atomic_set(&newsk->sk_omem_alloc, 0);
1509 skb_queue_head_init(&newsk->sk_receive_queue);
1510 skb_queue_head_init(&newsk->sk_write_queue);
1511
87d11ceb 1512 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1513 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1514 af_callback_keys + newsk->sk_family,
1515 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1516
1517 newsk->sk_dst_cache = NULL;
1518 newsk->sk_wmem_queued = 0;
1519 newsk->sk_forward_alloc = 0;
9caad864 1520 atomic_set(&newsk->sk_drops, 0);
87d11ceb 1521 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1522 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1523
1524 sock_reset_flag(newsk, SOCK_DONE);
1525 skb_queue_head_init(&newsk->sk_error_queue);
1526
0d7da9dd 1527 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb 1528 if (filter != NULL)
278571ba
AS		 1529 /* though it's an empty new sock, the charging may fail
1530 * if sysctl_optmem_max was changed between creation of
1531 * original socket and cloning
1532 */
1533 is_charged = sk_filter_charge(newsk, filter);
87d11ceb 1534
d188ba86 1535 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
87d11ceb
ACM		 1536 /* It is still raw copy of parent, so invalidate
1537 * destructor and make plain sk_free() */
1538 newsk->sk_destruct = NULL;
b0691c8e 1539 bh_unlock_sock(newsk);
87d11ceb
ACM		 1540 sk_free(newsk);
1541 newsk = NULL;
1542 goto out;
1543 }
fa463497 1544 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
87d11ceb
ACM		 1545
1546 newsk->sk_err = 0;
e551c32d 1547 newsk->sk_err_soft = 0;
87d11ceb 1548 newsk->sk_priority = 0;
2c8c56e1 1549 newsk->sk_incoming_cpu = raw_smp_processor_id();
33cf7c90 1550 atomic64_set(&newsk->sk_cookie, 0);
d979a39d 1551
2d758073 1552 mem_cgroup_sk_alloc(newsk);
d979a39d
JW		 1553 cgroup_sk_alloc(&newsk->sk_cgrp_data);
1554
4dc6dc71
ED		 1555 /*
1556 * Before updating sk_refcnt, we must commit prior changes to memory
1557 * (Documentation/RCU/rculist_nulls.txt for details)
1558 */
1559 smp_wmb();
87d11ceb
ACM		 1560 atomic_set(&newsk->sk_refcnt, 2);
1561
1562 /*
1563 * Increment the counter in the same struct proto as the master
1564 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1565 * is the same as sk->sk_prot->socks, as this field was copied
1566 * with memcpy).
1567 *
1568 * This _changes_ the previous behaviour, where
1569 * tcp_create_openreq_child always was incrementing the
1570 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1571 * to be taken into account in all callers. -acme
1572 */
1573 sk_refcnt_debug_inc(newsk);
972692e0 1574 sk_set_socket(newsk, NULL);
43815482 1575 newsk->sk_wq = NULL;
87d11ceb
ACM		 1576
1577 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1578 sk_sockets_allocated_inc(newsk);
704da560 1579
080a270f
HFS		 1580 if (sock_needs_netstamp(sk) &&
1581 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1582 net_enable_timestamp();
87d11ceb
ACM		 1583 }
1584out:
1585 return newsk;
1586}
e56c57d0 1587EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1588
9958089a
AK		 1589void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1590{
d6a4e26a
ED		 1591 u32 max_segs = 1;
1592
6bd4f355 1593 sk_dst_set(sk, dst);
9958089a
AK		 1594 sk->sk_route_caps = dst->dev->features;
1595 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1596 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1597 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1598 if (sk_can_gso(sk)) {
82cc1a7a 1599 if (dst->header_len) {
9958089a 1600 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1601 } else {
9958089a 1602 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1603 sk->sk_gso_max_size = dst->dev->gso_max_size;
d6a4e26a 1604 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
82cc1a7a 1605 }
9958089a 1606 }
d6a4e26a 1607 sk->sk_gso_max_segs = max_segs;
9958089a
AK		 1608}
1609EXPORT_SYMBOL_GPL(sk_setup_caps);
1610
1da177e4
LT		 1611/*
1612 * Simple resource managers for sockets.
1613 */
1614
1615
4ec93edb
YH		 1616/*
1617 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1618 */
1619void sock_wfree(struct sk_buff *skb)
1620{
1621 struct sock *sk = skb->sk;
d99927f4 1622 unsigned int len = skb->truesize;
1da177e4 1623
d99927f4
ED		 1624 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1625 /*
1626 * Keep a reference on sk_wmem_alloc, this will be released
1627 * after sk_write_space() call
1628 */
1629 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1630 sk->sk_write_space(sk);
d99927f4
ED		 1631 len = 1;
1632 }
2b85a34e 1633 /*
d99927f4
ED		 1634 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1635 * could not do because of in-flight packets
2b85a34e 1636 */
d99927f4 1637 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1638 __sk_free(sk);
1da177e4 1639}
2a91525c 1640EXPORT_SYMBOL(sock_wfree);
1da177e4 1641
1d2077ac
ED		 1642/* This variant of sock_wfree() is used by TCP,
1643 * since it sets SOCK_USE_WRITE_QUEUE.
1644 */
1645void __sock_wfree(struct sk_buff *skb)
1646{
1647 struct sock *sk = skb->sk;
1648
1649 if (atomic_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
1650 __sk_free(sk);
1651}
1652
9e17f8a4
ED		 1653void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1654{
1655 skb_orphan(skb);
1656 skb->sk = sk;
1657#ifdef CONFIG_INET
1658 if (unlikely(!sk_fullsock(sk))) {
1659 skb->destructor = sock_edemux;
1660 sock_hold(sk);
1661 return;
1662 }
1663#endif
1664 skb->destructor = sock_wfree;
1665 skb_set_hash_from_sk(skb, sk);
1666 /*
1667 * We used to take a refcount on sk, but following operation
1668 * is enough to guarantee sk_free() wont free this sock until
1669 * all in-flight packets are completed
1670 */
1671 atomic_add(skb->truesize, &sk->sk_wmem_alloc);
1672}
1673EXPORT_SYMBOL(skb_set_owner_w);
1674
1d2077ac
ED		 1675/* This helper is used by netem, as it can hold packets in its
1676 * delay queue. We want to allow the owner socket to send more
1677 * packets, as if they were already TX completed by a typical driver.
1678 * But we also want to keep skb->sk set because some packet schedulers
1679 * rely on it (sch_fq for example). So we set skb->truesize to a small
1680 * amount (1) and decrease sk_wmem_alloc accordingly.
1681 */
f2f872f9
ED		 1682void skb_orphan_partial(struct sk_buff *skb)
1683{
1d2077ac
ED		 1684 /* If this skb is a TCP pure ACK or already went here,
1685 * we have nothing to do. 2 is already a very small truesize.
1686 */
1687 if (skb->truesize <= 2)
1688 return;
1689
f2f872f9
ED		 1690 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1691 * so we do not completely orphan skb, but transfert all
1692 * accounted bytes but one, to avoid unexpected reorders.
1693 */
1694 if (skb->destructor == sock_wfree
1695#ifdef CONFIG_INET
1696 || skb->destructor == tcp_wfree
1697#endif
1698 ) {
1699 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1700 skb->truesize = 1;
1701 } else {
1702 skb_orphan(skb);
1703 }
1704}
1705EXPORT_SYMBOL(skb_orphan_partial);
1706
4ec93edb
YH		 1707/*
1708 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1709 */
1710void sock_rfree(struct sk_buff *skb)
1711{
1712 struct sock *sk = skb->sk;
d361fd59 1713 unsigned int len = skb->truesize;
1da177e4 1714
d361fd59
ED		 1715 atomic_sub(len, &sk->sk_rmem_alloc);
1716 sk_mem_uncharge(sk, len);
1da177e4 1717}
2a91525c 1718EXPORT_SYMBOL(sock_rfree);
1da177e4 1719
7768eed8
OH		 1720/*
1721 * Buffer destructor for skbs that are not used directly in read or write
1722 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1723 */
62bccb8c
AD		 1724void sock_efree(struct sk_buff *skb)
1725{
1726 sock_put(skb->sk);
1727}
1728EXPORT_SYMBOL(sock_efree);
1729
976d0201 1730kuid_t sock_i_uid(struct sock *sk)
1da177e4 1731{
976d0201 1732 kuid_t uid;
1da177e4 1733
f064af1e 1734 read_lock_bh(&sk->sk_callback_lock);
976d0201 1735 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1736 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1737 return uid;
1738}
2a91525c 1739EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1740
1741unsigned long sock_i_ino(struct sock *sk)
1742{
1743 unsigned long ino;
1744
f064af1e 1745 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1746 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1747 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1748 return ino;
1749}
2a91525c 1750EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1751
1752/*
1753 * Allocate a skb from the socket's send buffer.
1754 */
86a76caf 1755struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1756 gfp_t priority)
1da177e4
LT		 1757{
1758 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1759 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1760 if (skb) {
1761 skb_set_owner_w(skb, sk);
1762 return skb;
1763 }
1764 }
1765 return NULL;
1766}
2a91525c 1767EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1768
4ec93edb 1769/*
1da177e4 1770 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1771 */
dd0fc66f 1772void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1773{
95c96174 1774 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1775 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1776 void *mem;
1777 /* First do the add, to avoid the race if kmalloc
4ec93edb 1778 * might sleep.
1da177e4
LT		 1779 */
1780 atomic_add(size, &sk->sk_omem_alloc);
1781 mem = kmalloc(size, priority);
1782 if (mem)
1783 return mem;
1784 atomic_sub(size, &sk->sk_omem_alloc);
1785 }
1786 return NULL;
1787}
2a91525c 1788EXPORT_SYMBOL(sock_kmalloc);
1da177e4 1789
79e88659
DB		 1790/* Free an option memory block. Note, we actually want the inline
1791 * here as this allows gcc to detect the nullify and fold away the
1792 * condition entirely.
1da177e4 1793 */
79e88659
DB		 1794static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1795 const bool nullify)
1da177e4 1796{
e53da5fb
DM		 1797 if (WARN_ON_ONCE(!mem))
1798 return;
79e88659
DB		 1799 if (nullify)
1800 kzfree(mem);
1801 else
1802 kfree(mem);
1da177e4
LT		 1803 atomic_sub(size, &sk->sk_omem_alloc);
1804}
79e88659
DB		 1805
1806void sock_kfree_s(struct sock *sk, void *mem, int size)
1807{
1808 __sock_kfree_s(sk, mem, size, false);
1809}
2a91525c 1810EXPORT_SYMBOL(sock_kfree_s);
1da177e4 1811
79e88659
DB		 1812void sock_kzfree_s(struct sock *sk, void *mem, int size)
1813{
1814 __sock_kfree_s(sk, mem, size, true);
1815}
1816EXPORT_SYMBOL(sock_kzfree_s);
1817
1da177e4
LT		 1818/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1819 I think, these locks should be removed for datagram sockets.
1820 */
2a91525c 1821static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1822{
1823 DEFINE_WAIT(wait);
1824
9cd3e072 1825 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1da177e4
LT		 1826 for (;;) {
1827 if (!timeo)
1828 break;
1829 if (signal_pending(current))
1830 break;
1831 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1832 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1833 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1834 break;
1835 if (sk->sk_shutdown & SEND_SHUTDOWN)
1836 break;
1837 if (sk->sk_err)
1838 break;
1839 timeo = schedule_timeout(timeo);
1840 }
aa395145 1841 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1842 return timeo;
1843}
1844
1845
1846/*
1847 * Generic send/receive buffer handlers
1848 */
1849
4cc7f68d
HX		 1850struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1851 unsigned long data_len, int noblock,
28d64271 1852 int *errcode, int max_page_order)
1da177e4 1853{
2e4e4410 1854 struct sk_buff *skb;
1da177e4
LT		 1855 long timeo;
1856 int err;
1857
1da177e4 1858 timeo = sock_sndtimeo(sk, noblock);
2e4e4410 1859 for (;;) {
1da177e4
LT		 1860 err = sock_error(sk);
1861 if (err != 0)
1862 goto failure;
1863
1864 err = -EPIPE;
1865 if (sk->sk_shutdown & SEND_SHUTDOWN)
1866 goto failure;
1867
2e4e4410
ED		 1868 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
1869 break;
28d64271 1870
9cd3e072 1871 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2e4e4410
ED		 1872 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1873 err = -EAGAIN;
1874 if (!timeo)
1da177e4 1875 goto failure;
2e4e4410
ED		 1876 if (signal_pending(current))
1877 goto interrupted;
1878 timeo = sock_wait_for_wmem(sk, timeo);
1da177e4 1879 }
2e4e4410
ED		 1880 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
1881 errcode, sk->sk_allocation);
1882 if (skb)
1883 skb_set_owner_w(skb, sk);
1da177e4
LT		 1884 return skb;
1885
1886interrupted:
1887 err = sock_intr_errno(timeo);
1888failure:
1889 *errcode = err;
1890 return NULL;
1891}
4cc7f68d 1892EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1893
4ec93edb 1894struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1895 int noblock, int *errcode)
1896{
28d64271 1897 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1898}
2a91525c 1899EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1900
39771b12
WB		 1901int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
1902 struct sockcm_cookie *sockc)
1903{
3dd17e63
SHY		 1904 u32 tsflags;
1905
39771b12
WB		 1906 switch (cmsg->cmsg_type) {
1907 case SO_MARK:
1908 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1909 return -EPERM;
1910 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
1911 return -EINVAL;
1912 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
1913 break;
3dd17e63
SHY		 1914 case SO_TIMESTAMPING:
1915 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
1916 return -EINVAL;
1917
1918 tsflags = *(u32 *)CMSG_DATA(cmsg);
1919 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
1920 return -EINVAL;
1921
1922 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
1923 sockc->tsflags |= tsflags;
1924 break;
779f1ede
SHY		 1925 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
1926 case SCM_RIGHTS:
1927 case SCM_CREDENTIALS:
1928 break;
39771b12
WB		 1929 default:
1930 return -EINVAL;
1931 }
1932 return 0;
1933}
1934EXPORT_SYMBOL(__sock_cmsg_send);
1935
f28ea365
EJ		 1936int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
1937 struct sockcm_cookie *sockc)
1938{
1939 struct cmsghdr *cmsg;
39771b12 1940 int ret;
f28ea365
EJ		 1941
1942 for_each_cmsghdr(cmsg, msg) {
1943 if (!CMSG_OK(msg, cmsg))
1944 return -EINVAL;
1945 if (cmsg->cmsg_level != SOL_SOCKET)
1946 continue;
39771b12
WB		 1947 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
1948 if (ret)
1949 return ret;
f28ea365
EJ		 1950 }
1951 return 0;
1952}
1953EXPORT_SYMBOL(sock_cmsg_send);
1954
5640f768
ED		 1955/* On 32bit arches, an skb frag is limited to 2^15 */
1956#define SKB_FRAG_PAGE_ORDER get_order(32768)
1957
400dfd3a
ED		 1958/**
1959 * skb_page_frag_refill - check that a page_frag contains enough room
1960 * @sz: minimum size of the fragment we want to get
1961 * @pfrag: pointer to page_frag
82d5e2b8 1962 * @gfp: priority for memory allocation
400dfd3a
ED		 1963 *
1964 * Note: While this allocator tries to use high order pages, there is
1965 * no guarantee that allocations succeed. Therefore, @sz MUST be
1966 * less or equal than PAGE_SIZE.
1967 */
d9b2938a 1968bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 1969{
5640f768 1970 if (pfrag->page) {
fe896d18 1971 if (page_ref_count(pfrag->page) == 1) {
5640f768
ED		 1972 pfrag->offset = 0;
1973 return true;
1974 }
400dfd3a 1975 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1976 return true;
1977 put_page(pfrag->page);
1978 }
1979
d9b2938a
ED		 1980 pfrag->offset = 0;
1981 if (SKB_FRAG_PAGE_ORDER) {
d0164adc
MG		 1982 /* Avoid direct reclaim but allow kswapd to wake */
1983 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
1984 __GFP_COMP | __GFP_NOWARN |
1985 __GFP_NORETRY,
d9b2938a 1986 SKB_FRAG_PAGE_ORDER);
5640f768 1987 if (likely(pfrag->page)) {
d9b2938a 1988 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 1989 return true;
1990 }
d9b2938a
ED		 1991 }
1992 pfrag->page = alloc_page(gfp);
1993 if (likely(pfrag->page)) {
1994 pfrag->size = PAGE_SIZE;
1995 return true;
1996 }
400dfd3a
ED		 1997 return false;
1998}
1999EXPORT_SYMBOL(skb_page_frag_refill);
2000
2001bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2002{
2003 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2004 return true;
2005
5640f768
ED		 2006 sk_enter_memory_pressure(sk);
2007 sk_stream_moderate_sndbuf(sk);
2008 return false;
2009}
2010EXPORT_SYMBOL(sk_page_frag_refill);
2011
1da177e4 2012static void __lock_sock(struct sock *sk)
f39234d6
NK		 2013 __releases(&sk->sk_lock.slock)
2014 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 2015{
2016 DEFINE_WAIT(wait);
2017
e71a4783 2018 for (;;) {
1da177e4
LT		 2019 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2020 TASK_UNINTERRUPTIBLE);
2021 spin_unlock_bh(&sk->sk_lock.slock);
2022 schedule();
2023 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 2024 if (!sock_owned_by_user(sk))
1da177e4
LT		 2025 break;
2026 }
2027 finish_wait(&sk->sk_lock.wq, &wait);
2028}
2029
2030static void __release_sock(struct sock *sk)
f39234d6
NK		 2031 __releases(&sk->sk_lock.slock)
2032 __acquires(&sk->sk_lock.slock)
1da177e4 2033{
5413d1ba 2034 struct sk_buff *skb, *next;
1da177e4 2035
5413d1ba 2036 while ((skb = sk->sk_backlog.head) != NULL) {
1da177e4 2037 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1da177e4 2038
5413d1ba 2039 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4 2040
5413d1ba
ED		 2041 do {
2042 next = skb->next;
e4cbb02a 2043 prefetch(next);
7fee226a 2044 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 2045 skb->next = NULL;
c57943a1 2046 sk_backlog_rcv(sk, skb);
1da177e4 2047
5413d1ba 2048 cond_resched();
1da177e4
LT		 2049
2050 skb = next;
2051 } while (skb != NULL);
2052
5413d1ba
ED		 2053 spin_lock_bh(&sk->sk_lock.slock);
2054 }
8eae939f
ZY		 2055
2056 /*
2057 * Doing the zeroing here guarantee we can not loop forever
2058 * while a wild producer attempts to flood us.
2059 */
2060 sk->sk_backlog.len = 0;
1da177e4
LT		 2061}
2062
d41a69f1
ED		 2063void __sk_flush_backlog(struct sock *sk)
2064{
2065 spin_lock_bh(&sk->sk_lock.slock);
2066 __release_sock(sk);
2067 spin_unlock_bh(&sk->sk_lock.slock);
2068}
2069
1da177e4
LT		 2070/**
2071 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 2072 * @sk: sock to wait on
2073 * @timeo: for how long
dfbafc99 2074 * @skb: last skb seen on sk_receive_queue
1da177e4
LT		 2075 *
2076 * Now socket state including sk->sk_err is changed only under lock,
2077 * hence we may omit checks after joining wait queue.
2078 * We check receive queue before schedule() only as optimization;
2079 * it is very likely that release_sock() added new data.
2080 */
dfbafc99 2081int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
1da177e4
LT		 2082{
2083 int rc;
2084 DEFINE_WAIT(wait);
2085
aa395145 2086 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9cd3e072 2087 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
dfbafc99 2088 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb);
9cd3e072 2089 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
aa395145 2090 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 2091 return rc;
2092}
1da177e4
LT		 2093EXPORT_SYMBOL(sk_wait_data);
2094
3ab224be
HA		 2095/**
2096 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2097 * @sk: socket
2098 * @size: memory size to allocate
2099 * @kind: allocation type
2100 *
2101 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2102 * rmem allocation. This function assumes that protocols which have
2103 * memory_pressure use sk_wmem_queued as write buffer accounting.
2104 */
2105int __sk_mem_schedule(struct sock *sk, int size, int kind)
2106{
2107 struct proto *prot = sk->sk_prot;
2108 int amt = sk_mem_pages(size);
8d987e5c 2109 long allocated;
3ab224be
HA		 2110
2111 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 2112
e805605c
JW		 2113 allocated = sk_memory_allocated_add(sk, amt);
2114
baac50bb
JW		 2115 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2116 !mem_cgroup_charge_skmem(sk->sk_memcg, amt))
e805605c 2117 goto suppress_allocation;
3ab224be
HA		 2118
2119 /* Under limit. */
e805605c 2120 if (allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2121 sk_leave_memory_pressure(sk);
3ab224be
HA		 2122 return 1;
2123 }
2124
e805605c
JW		 2125 /* Under pressure. */
2126 if (allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2127 sk_enter_memory_pressure(sk);
3ab224be 2128
e805605c
JW		 2129 /* Over hard limit. */
2130 if (allocated > sk_prot_mem_limits(sk, 2))
3ab224be
HA		 2131 goto suppress_allocation;
2132
2133 /* guarantee minimum buffer size under pressure */
2134 if (kind == SK_MEM_RECV) {
2135 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2136 return 1;
180d8cd9 2137
3ab224be
HA		 2138 } else { /* SK_MEM_SEND */
2139 if (sk->sk_type == SOCK_STREAM) {
2140 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2141 return 1;
2142 } else if (atomic_read(&sk->sk_wmem_alloc) <
2143 prot->sysctl_wmem[0])
2144 return 1;
2145 }
2146
180d8cd9 2147 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2148 int alloc;
2149
180d8cd9 2150 if (!sk_under_memory_pressure(sk))
1748376b 2151 return 1;
180d8cd9
GC		 2152 alloc = sk_sockets_allocated_read_positive(sk);
2153 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2154 sk_mem_pages(sk->sk_wmem_queued +
2155 atomic_read(&sk->sk_rmem_alloc) +
2156 sk->sk_forward_alloc))
2157 return 1;
2158 }
2159
2160suppress_allocation:
2161
2162 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2163 sk_stream_moderate_sndbuf(sk);
2164
2165 /* Fail only if socket is _under_ its sndbuf.
2166 * In this case we cannot block, so that we have to fail.
2167 */
2168 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2169 return 1;
2170 }
2171
3847ce32
SM		 2172 trace_sock_exceed_buf_limit(sk, prot, allocated);
2173
3ab224be
HA		 2174 /* Alas. Undo changes. */
2175 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2176
0e90b31f 2177 sk_memory_allocated_sub(sk, amt);
180d8cd9 2178
baac50bb
JW		 2179 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2180 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
e805605c 2181
3ab224be
HA		 2182 return 0;
2183}
3ab224be
HA		 2184EXPORT_SYMBOL(__sk_mem_schedule);
2185
2186/**
69dba9bb 2187 * __sk_mem_reclaim - reclaim memory_allocated
3ab224be 2188 * @sk: socket
1a24e04e 2189 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
3ab224be 2190 */
1a24e04e 2191void __sk_mem_reclaim(struct sock *sk, int amount)
3ab224be 2192{
1a24e04e
ED		 2193 amount >>= SK_MEM_QUANTUM_SHIFT;
2194 sk_memory_allocated_sub(sk, amount);
2195 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
3ab224be 2196
baac50bb
JW		 2197 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2198 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
e805605c 2199
180d8cd9
GC		 2200 if (sk_under_memory_pressure(sk) &&
2201 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2202 sk_leave_memory_pressure(sk);
3ab224be 2203}
3ab224be
HA		 2204EXPORT_SYMBOL(__sk_mem_reclaim);
2205
627d2d6b 2206int sk_set_peek_off(struct sock *sk, int val)
2207{
2208 if (val < 0)
2209 return -EINVAL;
2210
2211 sk->sk_peek_off = val;
2212 return 0;
2213}
2214EXPORT_SYMBOL_GPL(sk_set_peek_off);
3ab224be 2215
1da177e4
LT		 2216/*
2217 * Set of default routines for initialising struct proto_ops when
2218 * the protocol does not support a particular function. In certain
2219 * cases where it makes no sense for a protocol to have a "do nothing"
2220 * function, some default processing is provided.
2221 */
2222
2223int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2224{
2225 return -EOPNOTSUPP;
2226}
2a91525c 2227EXPORT_SYMBOL(sock_no_bind);
1da177e4 2228
4ec93edb 2229int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2230 int len, int flags)
2231{
2232 return -EOPNOTSUPP;
2233}
2a91525c 2234EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2235
2236int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2237{
2238 return -EOPNOTSUPP;
2239}
2a91525c 2240EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2241
2242int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2243{
2244 return -EOPNOTSUPP;
2245}
2a91525c 2246EXPORT_SYMBOL(sock_no_accept);
1da177e4 2247
4ec93edb 2248int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2249 int *len, int peer)
2250{
2251 return -EOPNOTSUPP;
2252}
2a91525c 2253EXPORT_SYMBOL(sock_no_getname);
1da177e4 2254
2a91525c 2255unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2256{
2257 return 0;
2258}
2a91525c 2259EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2260
2261int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2262{
2263 return -EOPNOTSUPP;
2264}
2a91525c 2265EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2266
2267int sock_no_listen(struct socket *sock, int backlog)
2268{
2269 return -EOPNOTSUPP;
2270}
2a91525c 2271EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2272
2273int sock_no_shutdown(struct socket *sock, int how)
2274{
2275 return -EOPNOTSUPP;
2276}
2a91525c 2277EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2278
2279int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2280 char __user *optval, unsigned int optlen)
1da177e4
LT		 2281{
2282 return -EOPNOTSUPP;
2283}
2a91525c 2284EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2285
2286int sock_no_getsockopt(struct socket *sock, int level, int optname,
2287 char __user *optval, int __user *optlen)
2288{
2289 return -EOPNOTSUPP;
2290}
2a91525c 2291EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4 2292
1b784140 2293int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
1da177e4
LT		 2294{
2295 return -EOPNOTSUPP;
2296}
2a91525c 2297EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4 2298
1b784140
YX		 2299int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2300 int flags)
1da177e4
LT		 2301{
2302 return -EOPNOTSUPP;
2303}
2a91525c 2304EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2305
2306int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2307{
2308 /* Mirror missing mmap method error code */
2309 return -ENODEV;
2310}
2a91525c 2311EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2312
2313ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2314{
2315 ssize_t res;
2316 struct msghdr msg = {.msg_flags = flags};
2317 struct kvec iov;
2318 char *kaddr = kmap(page);
2319 iov.iov_base = kaddr + offset;
2320 iov.iov_len = size;
2321 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2322 kunmap(page);
2323 return res;
2324}
2a91525c 2325EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2326
2327/*
2328 * Default Socket Callbacks
2329 */
2330
2331static void sock_def_wakeup(struct sock *sk)
2332{
43815482
ED		 2333 struct socket_wq *wq;
2334
2335 rcu_read_lock();
2336 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2337 if (skwq_has_sleeper(wq))
43815482
ED		 2338 wake_up_interruptible_all(&wq->wait);
2339 rcu_read_unlock();
1da177e4
LT		 2340}
2341
2342static void sock_def_error_report(struct sock *sk)
2343{
43815482
ED		 2344 struct socket_wq *wq;
2345
2346 rcu_read_lock();
2347 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2348 if (skwq_has_sleeper(wq))
43815482 2349 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2350 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2351 rcu_read_unlock();
1da177e4
LT		 2352}
2353
676d2369 2354static void sock_def_readable(struct sock *sk)
1da177e4 2355{
43815482
ED		 2356 struct socket_wq *wq;
2357
2358 rcu_read_lock();
2359 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2360 if (skwq_has_sleeper(wq))
2c6607c6 2361 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2362 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2363 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2364 rcu_read_unlock();
1da177e4
LT		 2365}
2366
2367static void sock_def_write_space(struct sock *sk)
2368{
43815482
ED		 2369 struct socket_wq *wq;
2370
2371 rcu_read_lock();
1da177e4
LT		 2372
2373 /* Do not wake up a writer until he can make "significant"
2374 * progress. --DaveM
2375 */
e71a4783 2376 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482 2377 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2378 if (skwq_has_sleeper(wq))
43815482 2379 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2380 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2381
2382 /* Should agree with poll, otherwise some programs break */
2383 if (sock_writeable(sk))
8d8ad9d7 2384 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2385 }
2386
43815482 2387 rcu_read_unlock();
1da177e4
LT		 2388}
2389
2390static void sock_def_destruct(struct sock *sk)
2391{
1da177e4
LT		 2392}
2393
2394void sk_send_sigurg(struct sock *sk)
2395{
2396 if (sk->sk_socket && sk->sk_socket->file)
2397 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2398 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2399}
2a91525c 2400EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2401
2402void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2403 unsigned long expires)
2404{
2405 if (!mod_timer(timer, expires))
2406 sock_hold(sk);
2407}
1da177e4
LT		 2408EXPORT_SYMBOL(sk_reset_timer);
2409
2410void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2411{
25cc4ae9 2412 if (del_timer(timer))
1da177e4
LT		 2413 __sock_put(sk);
2414}
1da177e4
LT		 2415EXPORT_SYMBOL(sk_stop_timer);
2416
2417void sock_init_data(struct socket *sock, struct sock *sk)
2418{
2419 skb_queue_head_init(&sk->sk_receive_queue);
2420 skb_queue_head_init(&sk->sk_write_queue);
2421 skb_queue_head_init(&sk->sk_error_queue);
2422
2423 sk->sk_send_head = NULL;
2424
2425 init_timer(&sk->sk_timer);
4ec93edb 2426
1da177e4
LT		 2427 sk->sk_allocation = GFP_KERNEL;
2428 sk->sk_rcvbuf = sysctl_rmem_default;
2429 sk->sk_sndbuf = sysctl_wmem_default;
2430 sk->sk_state = TCP_CLOSE;
972692e0 2431 sk_set_socket(sk, sock);
1da177e4
LT		 2432
2433 sock_set_flag(sk, SOCK_ZAPPED);
2434
e71a4783 2435 if (sock) {
1da177e4 2436 sk->sk_type = sock->type;
43815482 2437 sk->sk_wq = sock->wq;
1da177e4
LT		 2438 sock->sk = sk;
2439 } else
43815482 2440 sk->sk_wq = NULL;
1da177e4 2441
1da177e4 2442 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2443 lockdep_set_class_and_name(&sk->sk_callback_lock,
2444 af_callback_keys + sk->sk_family,
2445 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2446
2447 sk->sk_state_change = sock_def_wakeup;
2448 sk->sk_data_ready = sock_def_readable;
2449 sk->sk_write_space = sock_def_write_space;
2450 sk->sk_error_report = sock_def_error_report;
2451 sk->sk_destruct = sock_def_destruct;
2452
5640f768
ED		 2453 sk->sk_frag.page = NULL;
2454 sk->sk_frag.offset = 0;
ef64a54f 2455 sk->sk_peek_off = -1;
1da177e4 2456
109f6e39
EB		 2457 sk->sk_peer_pid = NULL;
2458 sk->sk_peer_cred = NULL;
1da177e4
LT		 2459 sk->sk_write_pending = 0;
2460 sk->sk_rcvlowat = 1;
2461 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2462 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2463
f37f0afb 2464 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2465
e0d1095a 2466#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2467 sk->sk_napi_id = 0;
64b0dc51 2468 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2469#endif
2470
62748f32 2471 sk->sk_max_pacing_rate = ~0U;
7eec4174 2472 sk->sk_pacing_rate = ~0U;
70da268b 2473 sk->sk_incoming_cpu = -1;
4dc6dc71
ED		 2474 /*
2475 * Before updating sk_refcnt, we must commit prior changes to memory
2476 * (Documentation/RCU/rculist_nulls.txt for details)
2477 */
2478 smp_wmb();
1da177e4 2479 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2480 atomic_set(&sk->sk_drops, 0);
1da177e4 2481}
2a91525c 2482EXPORT_SYMBOL(sock_init_data);
1da177e4 2483
b5606c2d 2484void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2485{
2486 might_sleep();
a5b5bb9a 2487 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2488 if (sk->sk_lock.owned)
1da177e4 2489 __lock_sock(sk);
d2e9117c 2490 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2491 spin_unlock(&sk->sk_lock.slock);
2492 /*
2493 * The sk_lock has mutex_lock() semantics here:
2494 */
fcc70d5f 2495 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2496 local_bh_enable();
1da177e4 2497}
fcc70d5f 2498EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2499
b5606c2d 2500void release_sock(struct sock *sk)
1da177e4 2501{
a5b5bb9a 2502 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2503 if (sk->sk_backlog.tail)
2504 __release_sock(sk);
46d3ceab 2505
c3f9b018
ED		 2506 /* Warning : release_cb() might need to release sk ownership,
2507 * ie call sock_release_ownership(sk) before us.
2508 */
46d3ceab
ED		 2509 if (sk->sk_prot->release_cb)
2510 sk->sk_prot->release_cb(sk);
2511
c3f9b018 2512 sock_release_ownership(sk);
a5b5bb9a
IM		 2513 if (waitqueue_active(&sk->sk_lock.wq))
2514 wake_up(&sk->sk_lock.wq);
2515 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2516}
2517EXPORT_SYMBOL(release_sock);
2518
8a74ad60
ED		 2519/**
2520 * lock_sock_fast - fast version of lock_sock
2521 * @sk: socket
2522 *
2523 * This version should be used for very small section, where process wont block
2524 * return false if fast path is taken
2525 * sk_lock.slock locked, owned = 0, BH disabled
2526 * return true if slow path is taken
2527 * sk_lock.slock unlocked, owned = 1, BH enabled
2528 */
2529bool lock_sock_fast(struct sock *sk)
2530{
2531 might_sleep();
2532 spin_lock_bh(&sk->sk_lock.slock);
2533
2534 if (!sk->sk_lock.owned)
2535 /*
2536 * Note : We must disable BH
2537 */
2538 return false;
2539
2540 __lock_sock(sk);
2541 sk->sk_lock.owned = 1;
2542 spin_unlock(&sk->sk_lock.slock);
2543 /*
2544 * The sk_lock has mutex_lock() semantics here:
2545 */
2546 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2547 local_bh_enable();
2548 return true;
2549}
2550EXPORT_SYMBOL(lock_sock_fast);
2551
1da177e4 2552int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2553{
b7aa0bf7 2554 struct timeval tv;
1da177e4 2555 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2556 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2557 tv = ktime_to_timeval(sk->sk_stamp);
2558 if (tv.tv_sec == -1)
1da177e4 2559 return -ENOENT;
b7aa0bf7
ED		 2560 if (tv.tv_sec == 0) {
2561 sk->sk_stamp = ktime_get_real();
2562 tv = ktime_to_timeval(sk->sk_stamp);
2563 }
2564 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2565}
1da177e4
LT		 2566EXPORT_SYMBOL(sock_get_timestamp);
2567
ae40eb1e
ED		 2568int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2569{
2570 struct timespec ts;
2571 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2572 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2573 ts = ktime_to_timespec(sk->sk_stamp);
2574 if (ts.tv_sec == -1)
2575 return -ENOENT;
2576 if (ts.tv_sec == 0) {
2577 sk->sk_stamp = ktime_get_real();
2578 ts = ktime_to_timespec(sk->sk_stamp);
2579 }
2580 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2581}
2582EXPORT_SYMBOL(sock_get_timestampns);
2583
20d49473 2584void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2585{
20d49473 2586 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2587 unsigned long previous_flags = sk->sk_flags;
2588
20d49473
PO		 2589 sock_set_flag(sk, flag);
2590 /*
2591 * we just set one of the two flags which require net
2592 * time stamping, but time stamping might have been on
2593 * already because of the other one
2594 */
080a270f
HFS		 2595 if (sock_needs_netstamp(sk) &&
2596 !(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2597 net_enable_timestamp();
1da177e4
LT		 2598 }
2599}
1da177e4 2600
cb820f8e
RC		 2601int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2602 int level, int type)
2603{
2604 struct sock_exterr_skb *serr;
364a9e93 2605 struct sk_buff *skb;
cb820f8e
RC		 2606 int copied, err;
2607
2608 err = -EAGAIN;
364a9e93 2609 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 2610 if (skb == NULL)
2611 goto out;
2612
2613 copied = skb->len;
2614 if (copied > len) {
2615 msg->msg_flags |= MSG_TRUNC;
2616 copied = len;
2617 }
51f3d02b 2618 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 2619 if (err)
2620 goto out_free_skb;
2621
2622 sock_recv_timestamp(msg, sk, skb);
2623
2624 serr = SKB_EXT_ERR(skb);
2625 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2626
2627 msg->msg_flags |= MSG_ERRQUEUE;
2628 err = copied;
2629
cb820f8e
RC		 2630out_free_skb:
2631 kfree_skb(skb);
2632out:
2633 return err;
2634}
2635EXPORT_SYMBOL(sock_recv_errqueue);
2636
1da177e4
LT		 2637/*
2638 * Get a socket option on an socket.
2639 *
2640 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2641 * asynchronous errors should be reported by getsockopt. We assume
2642 * this means if you specify SO_ERROR (otherwise whats the point of it).
2643 */
2644int sock_common_getsockopt(struct socket *sock, int level, int optname,
2645 char __user *optval, int __user *optlen)
2646{
2647 struct sock *sk = sock->sk;
2648
2649 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2650}
1da177e4
LT		 2651EXPORT_SYMBOL(sock_common_getsockopt);
2652
3fdadf7d 2653#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2654int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2655 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2656{
2657 struct sock *sk = sock->sk;
2658
1e51f951 2659 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2660 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2661 optval, optlen);
3fdadf7d
DM		 2662 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2663}
2664EXPORT_SYMBOL(compat_sock_common_getsockopt);
2665#endif
2666
1b784140
YX		 2667int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2668 int flags)
1da177e4
LT		 2669{
2670 struct sock *sk = sock->sk;
2671 int addr_len = 0;
2672 int err;
2673
1b784140 2674 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
1da177e4
LT		 2675 flags & ~MSG_DONTWAIT, &addr_len);
2676 if (err >= 0)
2677 msg->msg_namelen = addr_len;
2678 return err;
2679}
1da177e4
LT		 2680EXPORT_SYMBOL(sock_common_recvmsg);
2681
2682/*
2683 * Set socket options on an inet socket.
2684 */
2685int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2686 char __user *optval, unsigned int optlen)
1da177e4
LT		 2687{
2688 struct sock *sk = sock->sk;
2689
2690 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2691}
1da177e4
LT		 2692EXPORT_SYMBOL(sock_common_setsockopt);
2693
3fdadf7d 2694#ifdef CONFIG_COMPAT
543d9cfe 2695int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2696 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2697{
2698 struct sock *sk = sock->sk;
2699
543d9cfe
ACM		 2700 if (sk->sk_prot->compat_setsockopt != NULL)
2701 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2702 optval, optlen);
3fdadf7d
DM		 2703 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2704}
2705EXPORT_SYMBOL(compat_sock_common_setsockopt);
2706#endif
2707
1da177e4
LT		 2708void sk_common_release(struct sock *sk)
2709{
2710 if (sk->sk_prot->destroy)
2711 sk->sk_prot->destroy(sk);
2712
2713 /*
2714 * Observation: when sock_common_release is called, processes have
2715 * no access to socket. But net still has.
2716 * Step one, detach it from networking:
2717 *
2718 * A. Remove from hash tables.
2719 */
2720
2721 sk->sk_prot->unhash(sk);
2722
2723 /*
2724 * In this point socket cannot receive new packets, but it is possible
2725 * that some packets are in flight because some CPU runs receiver and
2726 * did hash table lookup before we unhashed socket. They will achieve
2727 * receive queue and will be purged by socket destructor.
2728 *
2729 * Also we still have packets pending on receive queue and probably,
2730 * our own packets waiting in device queues. sock_destroy will drain
2731 * receive queue, but transmitted packets will delay socket destruction
2732 * until the last reference will be released.
2733 */
2734
2735 sock_orphan(sk);
2736
2737 xfrm_sk_free_policy(sk);
2738
e6848976 2739 sk_refcnt_debug_release(sk);
5640f768
ED		 2740
2741 if (sk->sk_frag.page) {
2742 put_page(sk->sk_frag.page);
2743 sk->sk_frag.page = NULL;
2744 }
2745
1da177e4
LT		 2746 sock_put(sk);
2747}
1da177e4
LT		 2748EXPORT_SYMBOL(sk_common_release);
2749
13ff3d6f
PE		 2750#ifdef CONFIG_PROC_FS
2751#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2752struct prot_inuse {
2753 int val[PROTO_INUSE_NR];
2754};
13ff3d6f
PE		 2755
2756static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2757
2758#ifdef CONFIG_NET_NS
2759void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2760{
d6d9ca0f 2761 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2762}
2763EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2764
2765int sock_prot_inuse_get(struct net *net, struct proto *prot)
2766{
2767 int cpu, idx = prot->inuse_idx;
2768 int res = 0;
2769
2770 for_each_possible_cpu(cpu)
2771 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2772
2773 return res >= 0 ? res : 0;
2774}
2775EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2776
2c8c1e72 2777static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2778{
2779 net->core.inuse = alloc_percpu(struct prot_inuse);
2780 return net->core.inuse ? 0 : -ENOMEM;
2781}
2782
2c8c1e72 2783static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2784{
2785 free_percpu(net->core.inuse);
2786}
2787
2788static struct pernet_operations net_inuse_ops = {
2789 .init = sock_inuse_init_net,
2790 .exit = sock_inuse_exit_net,
2791};
2792
2793static __init int net_inuse_init(void)
2794{
2795 if (register_pernet_subsys(&net_inuse_ops))
2796 panic("Cannot initialize net inuse counters");
2797
2798 return 0;
2799}
2800
2801core_initcall(net_inuse_init);
2802#else
1338d466
PE		 2803static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2804
c29a0bc4 2805void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2806{
d6d9ca0f 2807 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2808}
2809EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2810
c29a0bc4 2811int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2812{
2813 int cpu, idx = prot->inuse_idx;
2814 int res = 0;
2815
2816 for_each_possible_cpu(cpu)
2817 res += per_cpu(prot_inuse, cpu).val[idx];
2818
2819 return res >= 0 ? res : 0;
2820}
2821EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2822#endif
13ff3d6f
PE		 2823
2824static void assign_proto_idx(struct proto *prot)
2825{
2826 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2827
2828 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2829 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2830 return;
2831 }
2832
2833 set_bit(prot->inuse_idx, proto_inuse_idx);
2834}
2835
2836static void release_proto_idx(struct proto *prot)
2837{
2838 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2839 clear_bit(prot->inuse_idx, proto_inuse_idx);
2840}
2841#else
2842static inline void assign_proto_idx(struct proto *prot)
2843{
2844}
2845
2846static inline void release_proto_idx(struct proto *prot)
2847{
2848}
2849#endif
2850
0159dfd3
ED		 2851static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
2852{
2853 if (!rsk_prot)
2854 return;
2855 kfree(rsk_prot->slab_name);
2856 rsk_prot->slab_name = NULL;
adf78eda
JL		 2857 kmem_cache_destroy(rsk_prot->slab);
2858 rsk_prot->slab = NULL;
0159dfd3
ED		 2859}
2860
2861static int req_prot_init(const struct proto *prot)
2862{
2863 struct request_sock_ops *rsk_prot = prot->rsk_prot;
2864
2865 if (!rsk_prot)
2866 return 0;
2867
2868 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
2869 prot->name);
2870 if (!rsk_prot->slab_name)
2871 return -ENOMEM;
2872
2873 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
2874 rsk_prot->obj_size, 0,
e96f78ab 2875 prot->slab_flags, NULL);
0159dfd3
ED		 2876
2877 if (!rsk_prot->slab) {
2878 pr_crit("%s: Can't create request sock SLAB cache!\n",
2879 prot->name);
2880 return -ENOMEM;
2881 }
2882 return 0;
2883}
2884
b733c007
PE		 2885int proto_register(struct proto *prot, int alloc_slab)
2886{
1da177e4
LT		 2887 if (alloc_slab) {
2888 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2889 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2890 NULL);
1da177e4
LT		 2891
2892 if (prot->slab == NULL) {
e005d193
JP		 2893 pr_crit("%s: Can't create sock SLAB cache!\n",
2894 prot->name);
60e7663d 2895 goto out;
1da177e4 2896 }
2e6599cb 2897
0159dfd3
ED		 2898 if (req_prot_init(prot))
2899 goto out_free_request_sock_slab;
8feaf0c0 2900
6d6ee43e 2901 if (prot->twsk_prot != NULL) {
faf23422 2902 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2903
7e56b5d6 2904 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2905 goto out_free_request_sock_slab;
2906
6d6ee43e 2907 prot->twsk_prot->twsk_slab =
7e56b5d6 2908 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2909 prot->twsk_prot->twsk_obj_size,
3ab5aee7 2910 0,
52db70dc 2911 prot->slab_flags,
20c2df83 2912 NULL);
6d6ee43e 2913 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2914 goto out_free_timewait_sock_slab_name;
2915 }
1da177e4
LT		 2916 }
2917
36b77a52 2918 mutex_lock(&proto_list_mutex);
1da177e4 2919 list_add(&prot->node, &proto_list);
13ff3d6f 2920 assign_proto_idx(prot);
36b77a52 2921 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2922 return 0;
2923
8feaf0c0 2924out_free_timewait_sock_slab_name:
7e56b5d6 2925 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0 2926out_free_request_sock_slab:
0159dfd3
ED		 2927 req_prot_cleanup(prot->rsk_prot);
2928
2e6599cb
ACM		 2929 kmem_cache_destroy(prot->slab);
2930 prot->slab = NULL;
b733c007
PE		 2931out:
2932 return -ENOBUFS;
1da177e4 2933}
1da177e4
LT		 2934EXPORT_SYMBOL(proto_register);
2935
2936void proto_unregister(struct proto *prot)
2937{
36b77a52 2938 mutex_lock(&proto_list_mutex);
13ff3d6f 2939 release_proto_idx(prot);
0a3f4358 2940 list_del(&prot->node);
36b77a52 2941 mutex_unlock(&proto_list_mutex);
1da177e4 2942
adf78eda
JL		 2943 kmem_cache_destroy(prot->slab);
2944 prot->slab = NULL;
1da177e4 2945
0159dfd3 2946 req_prot_cleanup(prot->rsk_prot);
2e6599cb 2947
6d6ee43e 2948 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2949 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2950 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2951 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2952 }
1da177e4 2953}
1da177e4
LT		 2954EXPORT_SYMBOL(proto_unregister);
2955
2956#ifdef CONFIG_PROC_FS
1da177e4 2957static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2958 __acquires(proto_list_mutex)
1da177e4 2959{
36b77a52 2960 mutex_lock(&proto_list_mutex);
60f0438a 2961 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2962}
2963
2964static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2965{
60f0438a 2966 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2967}
2968
2969static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2970 __releases(proto_list_mutex)
1da177e4 2971{
36b77a52 2972 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2973}
2974
2975static char proto_method_implemented(const void *method)
2976{
2977 return method == NULL ? 'n' : 'y';
2978}
180d8cd9
GC		 2979static long sock_prot_memory_allocated(struct proto *proto)
2980{
cb75a36c 2981 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2982}
2983
2984static char *sock_prot_memory_pressure(struct proto *proto)
2985{
2986 return proto->memory_pressure != NULL ?
2987 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2988}
1da177e4
LT		 2989
2990static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2991{
180d8cd9 2992
8d987e5c 2993 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2994 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2995 proto->name,
2996 proto->obj_size,
14e943db 2997 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2998 sock_prot_memory_allocated(proto),
2999 sock_prot_memory_pressure(proto),
1da177e4
LT		 3000 proto->max_header,
3001 proto->slab == NULL ? "no" : "yes",
3002 module_name(proto->owner),
3003 proto_method_implemented(proto->close),
3004 proto_method_implemented(proto->connect),
3005 proto_method_implemented(proto->disconnect),
3006 proto_method_implemented(proto->accept),
3007 proto_method_implemented(proto->ioctl),
3008 proto_method_implemented(proto->init),
3009 proto_method_implemented(proto->destroy),
3010 proto_method_implemented(proto->shutdown),
3011 proto_method_implemented(proto->setsockopt),
3012 proto_method_implemented(proto->getsockopt),
3013 proto_method_implemented(proto->sendmsg),
3014 proto_method_implemented(proto->recvmsg),
3015 proto_method_implemented(proto->sendpage),
3016 proto_method_implemented(proto->bind),
3017 proto_method_implemented(proto->backlog_rcv),
3018 proto_method_implemented(proto->hash),
3019 proto_method_implemented(proto->unhash),
3020 proto_method_implemented(proto->get_port),
3021 proto_method_implemented(proto->enter_memory_pressure));
3022}
3023
3024static int proto_seq_show(struct seq_file *seq, void *v)
3025{
60f0438a 3026 if (v == &proto_list)
1da177e4
LT		 3027 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3028 "protocol",
3029 "size",
3030 "sockets",
3031 "memory",
3032 "press",
3033 "maxhdr",
3034 "slab",
3035 "module",
3036 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3037 else
60f0438a 3038 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 3039 return 0;
3040}
3041
f690808e 3042static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 3043 .start = proto_seq_start,
3044 .next = proto_seq_next,
3045 .stop = proto_seq_stop,
3046 .show = proto_seq_show,
3047};
3048
3049static int proto_seq_open(struct inode *inode, struct file *file)
3050{
14e943db
ED		 3051 return seq_open_net(inode, file, &proto_seq_ops,
3052 sizeof(struct seq_net_private));
1da177e4
LT		 3053}
3054
9a32144e 3055static const struct file_operations proto_seq_fops = {
1da177e4
LT		 3056 .owner = THIS_MODULE,
3057 .open = proto_seq_open,
3058 .read = seq_read,
3059 .llseek = seq_lseek,
14e943db
ED		 3060 .release = seq_release_net,
3061};
3062
3063static __net_init int proto_init_net(struct net *net)
3064{
d4beaa66 3065 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 3066 return -ENOMEM;
3067
3068 return 0;
3069}
3070
3071static __net_exit void proto_exit_net(struct net *net)
3072{
ece31ffd 3073 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 3074}
3075
3076
3077static __net_initdata struct pernet_operations proto_net_ops = {
3078 .init = proto_init_net,
3079 .exit = proto_exit_net,
1da177e4
LT		 3080};
3081
3082static int __init proto_init(void)
3083{
14e943db 3084 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 3085}
3086
3087subsys_initcall(proto_init);
3088
3089#endif /* PROC_FS */
Linux 6.x block layer and io_uring tree(s)