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libbpf: fix check for presence of associated BTF for map creation
[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
80b14dee 94#include <asm/unaligned.h>
4fc268d2 95#include <linux/capability.h>
1da177e4 96#include <linux/errno.h>
cb820f8e 97#include <linux/errqueue.h>
1da177e4
LT		 98#include <linux/types.h>
99#include <linux/socket.h>
100#include <linux/in.h>
101#include <linux/kernel.h>
1da177e4
LT		 102#include <linux/module.h>
103#include <linux/proc_fs.h>
104#include <linux/seq_file.h>
105#include <linux/sched.h>
f1083048 106#include <linux/sched/mm.h>
1da177e4
LT		 107#include <linux/timer.h>
108#include <linux/string.h>
109#include <linux/sockios.h>
110#include <linux/net.h>
111#include <linux/mm.h>
112#include <linux/slab.h>
113#include <linux/interrupt.h>
114#include <linux/poll.h>
115#include <linux/tcp.h>
116#include <linux/init.h>
a1f8e7f7 117#include <linux/highmem.h>
3f551f94 118#include <linux/user_namespace.h>
c5905afb 119#include <linux/static_key.h>
3969eb38 120#include <linux/memcontrol.h>
8c1ae10d 121#include <linux/prefetch.h>
1da177e4 122
7c0f6ba6 123#include <linux/uaccess.h>
1da177e4
LT		 124
125#include <linux/netdevice.h>
126#include <net/protocol.h>
127#include <linux/skbuff.h>
457c4cbc 128#include <net/net_namespace.h>
2e6599cb 129#include <net/request_sock.h>
1da177e4 130#include <net/sock.h>
20d49473 131#include <linux/net_tstamp.h>
1da177e4
LT		 132#include <net/xfrm.h>
133#include <linux/ipsec.h>
f8451725 134#include <net/cls_cgroup.h>
5bc1421e 135#include <net/netprio_cgroup.h>
eb4cb008 136#include <linux/sock_diag.h>
1da177e4
LT		 137
138#include <linux/filter.h>
538950a1 139#include <net/sock_reuseport.h>
6ac99e8f 140#include <net/bpf_sk_storage.h>
1da177e4 141
3847ce32
SM		 142#include <trace/events/sock.h>
143
1da177e4 144#include <net/tcp.h>
076bb0c8 145#include <net/busy_poll.h>
06021292 146
36b77a52 147static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 148static LIST_HEAD(proto_list);
149
648845ab
TZ		 150static void sock_inuse_add(struct net *net, int val);
151
a3b299da
EB		 152/**
153 * sk_ns_capable - General socket capability test
154 * @sk: Socket to use a capability on or through
155 * @user_ns: The user namespace of the capability to use
156 * @cap: The capability to use
157 *
158 * Test to see if the opener of the socket had when the socket was
159 * created and the current process has the capability @cap in the user
160 * namespace @user_ns.
161 */
162bool sk_ns_capable(const struct sock *sk,
163 struct user_namespace *user_ns, int cap)
164{
165 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
166 ns_capable(user_ns, cap);
167}
168EXPORT_SYMBOL(sk_ns_capable);
169
170/**
171 * sk_capable - Socket global capability test
172 * @sk: Socket to use a capability on or through
e793c0f7 173 * @cap: The global capability to use
a3b299da
EB		 174 *
175 * Test to see if the opener of the socket had when the socket was
176 * created and the current process has the capability @cap in all user
177 * namespaces.
178 */
179bool sk_capable(const struct sock *sk, int cap)
180{
181 return sk_ns_capable(sk, &init_user_ns, cap);
182}
183EXPORT_SYMBOL(sk_capable);
184
185/**
186 * sk_net_capable - Network namespace socket capability test
187 * @sk: Socket to use a capability on or through
188 * @cap: The capability to use
189 *
e793c0f7 190 * Test to see if the opener of the socket had when the socket was created
a3b299da
EB		 191 * and the current process has the capability @cap over the network namespace
192 * the socket is a member of.
193 */
194bool sk_net_capable(const struct sock *sk, int cap)
195{
196 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
197}
198EXPORT_SYMBOL(sk_net_capable);
199
da21f24d
IM		 200/*
201 * Each address family might have different locking rules, so we have
cdfbabfb
DH		 202 * one slock key per address family and separate keys for internal and
203 * userspace sockets.
da21f24d 204 */
a5b5bb9a 205static struct lock_class_key af_family_keys[AF_MAX];
cdfbabfb 206static struct lock_class_key af_family_kern_keys[AF_MAX];
a5b5bb9a 207static struct lock_class_key af_family_slock_keys[AF_MAX];
cdfbabfb 208static struct lock_class_key af_family_kern_slock_keys[AF_MAX];
a5b5bb9a 209
a5b5bb9a
IM		 210/*
211 * Make lock validator output more readable. (we pre-construct these
212 * strings build-time, so that runtime initialization of socket
213 * locks is fast):
214 */
cdfbabfb
DH		 215
216#define _sock_locks(x) \
217 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \
218 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \
219 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \
220 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \
221 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \
222 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \
223 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \
224 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \
225 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \
226 x "27" , x "28" , x "AF_CAN" , \
227 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \
228 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \
229 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \
230 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \
68e8b849
BT		 231 x "AF_QIPCRTR", x "AF_SMC" , x "AF_XDP" , \
232 x "AF_MAX"
cdfbabfb 233
36cbd3dc 234static const char *const af_family_key_strings[AF_MAX+1] = {
cdfbabfb 235 _sock_locks("sk_lock-")
a5b5bb9a 236};
36cbd3dc 237static const char *const af_family_slock_key_strings[AF_MAX+1] = {
cdfbabfb 238 _sock_locks("slock-")
a5b5bb9a 239};
36cbd3dc 240static const char *const af_family_clock_key_strings[AF_MAX+1] = {
cdfbabfb
DH		 241 _sock_locks("clock-")
242};
243
244static const char *const af_family_kern_key_strings[AF_MAX+1] = {
245 _sock_locks("k-sk_lock-")
246};
247static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = {
248 _sock_locks("k-slock-")
249};
250static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = {
251 _sock_locks("k-clock-")
443aef0e 252};
581319c5 253static const char *const af_family_rlock_key_strings[AF_MAX+1] = {
6b431d50 254 _sock_locks("rlock-")
581319c5
PA		 255};
256static const char *const af_family_wlock_key_strings[AF_MAX+1] = {
6b431d50 257 _sock_locks("wlock-")
581319c5
PA		 258};
259static const char *const af_family_elock_key_strings[AF_MAX+1] = {
6b431d50 260 _sock_locks("elock-")
581319c5 261};
da21f24d
IM		 262
263/*
581319c5 264 * sk_callback_lock and sk queues locking rules are per-address-family,
da21f24d
IM		 265 * so split the lock classes by using a per-AF key:
266 */
267static struct lock_class_key af_callback_keys[AF_MAX];
581319c5
PA		 268static struct lock_class_key af_rlock_keys[AF_MAX];
269static struct lock_class_key af_wlock_keys[AF_MAX];
270static struct lock_class_key af_elock_keys[AF_MAX];
cdfbabfb 271static struct lock_class_key af_kern_callback_keys[AF_MAX];
da21f24d 272
1da177e4 273/* Run time adjustable parameters. */
ab32ea5d 274__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 275EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 276__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 277EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 278__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
279__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 280
25985edc 281/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 282int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 283EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 284
b245be1f
WB		 285int sysctl_tstamp_allow_data __read_mostly = 1;
286
a7950ae8
DB		 287DEFINE_STATIC_KEY_FALSE(memalloc_socks_key);
288EXPORT_SYMBOL_GPL(memalloc_socks_key);
c93bdd0e 289
7cb02404
MG		 290/**
291 * sk_set_memalloc - sets %SOCK_MEMALLOC
292 * @sk: socket to set it on
293 *
294 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
295 * It's the responsibility of the admin to adjust min_free_kbytes
296 * to meet the requirements
297 */
298void sk_set_memalloc(struct sock *sk)
299{
300 sock_set_flag(sk, SOCK_MEMALLOC);
301 sk->sk_allocation |= __GFP_MEMALLOC;
a7950ae8 302 static_branch_inc(&memalloc_socks_key);
7cb02404
MG		 303}
304EXPORT_SYMBOL_GPL(sk_set_memalloc);
305
306void sk_clear_memalloc(struct sock *sk)
307{
308 sock_reset_flag(sk, SOCK_MEMALLOC);
309 sk->sk_allocation &= ~__GFP_MEMALLOC;
a7950ae8 310 static_branch_dec(&memalloc_socks_key);
c76562b6
MG		 311
312 /*
313 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
5d753610
MG		 314 * progress of swapping. SOCK_MEMALLOC may be cleared while
315 * it has rmem allocations due to the last swapfile being deactivated
316 * but there is a risk that the socket is unusable due to exceeding
317 * the rmem limits. Reclaim the reserves and obey rmem limits again.
c76562b6 318 */
5d753610 319 sk_mem_reclaim(sk);
7cb02404
MG		 320}
321EXPORT_SYMBOL_GPL(sk_clear_memalloc);
322
b4b9e355
MG		 323int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
324{
325 int ret;
f1083048 326 unsigned int noreclaim_flag;
b4b9e355
MG		 327
328 /* these should have been dropped before queueing */
329 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
330
f1083048 331 noreclaim_flag = memalloc_noreclaim_save();
b4b9e355 332 ret = sk->sk_backlog_rcv(sk, skb);
f1083048 333 memalloc_noreclaim_restore(noreclaim_flag);
b4b9e355
MG		 334
335 return ret;
336}
337EXPORT_SYMBOL(__sk_backlog_rcv);
338
a9beb86a 339static int sock_get_timeout(long timeo, void *optval, bool old_timeval)
fe0c72f3 340{
a9beb86a
DD		 341 struct __kernel_sock_timeval tv;
342 int size;
fe0c72f3
AB		 343
344 if (timeo == MAX_SCHEDULE_TIMEOUT) {
345 tv.tv_sec = 0;
346 tv.tv_usec = 0;
347 } else {
348 tv.tv_sec = timeo / HZ;
349 tv.tv_usec = ((timeo % HZ) * USEC_PER_SEC) / HZ;
350 }
351
e6986423 352 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
fe0c72f3
AB		 353 struct old_timeval32 tv32 = { tv.tv_sec, tv.tv_usec };
354 *(struct old_timeval32 *)optval = tv32;
355 return sizeof(tv32);
356 }
357
a9beb86a
DD		 358 if (old_timeval) {
359 struct __kernel_old_timeval old_tv;
360 old_tv.tv_sec = tv.tv_sec;
361 old_tv.tv_usec = tv.tv_usec;
362 *(struct __kernel_old_timeval *)optval = old_tv;
363 size = sizeof(old_tv);
364 } else {
365 *(struct __kernel_sock_timeval *)optval = tv;
366 size = sizeof(tv);
367 }
368
369 return size;
fe0c72f3
AB		 370}
371
a9beb86a 372static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen, bool old_timeval)
1da177e4 373{
a9beb86a 374 struct __kernel_sock_timeval tv;
1da177e4 375
e6986423 376 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
fe0c72f3
AB		 377 struct old_timeval32 tv32;
378
379 if (optlen < sizeof(tv32))
380 return -EINVAL;
381
382 if (copy_from_user(&tv32, optval, sizeof(tv32)))
383 return -EFAULT;
384 tv.tv_sec = tv32.tv_sec;
385 tv.tv_usec = tv32.tv_usec;
a9beb86a
DD		 386 } else if (old_timeval) {
387 struct __kernel_old_timeval old_tv;
388
389 if (optlen < sizeof(old_tv))
390 return -EINVAL;
391 if (copy_from_user(&old_tv, optval, sizeof(old_tv)))
392 return -EFAULT;
393 tv.tv_sec = old_tv.tv_sec;
394 tv.tv_usec = old_tv.tv_usec;
fe0c72f3
AB		 395 } else {
396 if (optlen < sizeof(tv))
397 return -EINVAL;
398 if (copy_from_user(&tv, optval, sizeof(tv)))
399 return -EFAULT;
400 }
ba78073e
VA		 401 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
402 return -EDOM;
1da177e4 403
ba78073e 404 if (tv.tv_sec < 0) {
6f11df83
AM		 405 static int warned __read_mostly;
406
ba78073e 407 *timeo_p = 0;
50aab54f 408 if (warned < 10 && net_ratelimit()) {
ba78073e 409 warned++;
e005d193
JP		 410 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
411 __func__, current->comm, task_pid_nr(current));
50aab54f 412 }
ba78073e
VA		 413 return 0;
414 }
1da177e4
LT		 415 *timeo_p = MAX_SCHEDULE_TIMEOUT;
416 if (tv.tv_sec == 0 && tv.tv_usec == 0)
417 return 0;
a9beb86a
DD		 418 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1))
419 *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP((unsigned long)tv.tv_usec, USEC_PER_SEC / HZ);
1da177e4
LT		 420 return 0;
421}
422
423static void sock_warn_obsolete_bsdism(const char *name)
424{
425 static int warned;
426 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 427 if (strcmp(warncomm, current->comm) && warned < 5) {
428 strcpy(warncomm, current->comm);
e005d193
JP		 429 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
430 warncomm, name);
1da177e4
LT		 431 warned++;
432 }
433}
434
080a270f
HFS		 435static bool sock_needs_netstamp(const struct sock *sk)
436{
437 switch (sk->sk_family) {
438 case AF_UNSPEC:
439 case AF_UNIX:
440 return false;
441 default:
442 return true;
443 }
444}
445
08e29af3 446static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 447{
08e29af3
ED		 448 if (sk->sk_flags & flags) {
449 sk->sk_flags &= ~flags;
080a270f
HFS		 450 if (sock_needs_netstamp(sk) &&
451 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 452 net_disable_timestamp();
1da177e4
LT		 453 }
454}
455
456
e6afc8ac 457int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
f0088a50 458{
3b885787
NH		 459 unsigned long flags;
460 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 461
0fd7bac6 462 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 463 atomic_inc(&sk->sk_drops);
3847ce32 464 trace_sock_rcvqueue_full(sk, skb);
766e9037 465 return -ENOMEM;
f0088a50
DV		 466 }
467
c76562b6 468 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 469 atomic_inc(&sk->sk_drops);
470 return -ENOBUFS;
3ab224be
HA		 471 }
472
f0088a50
DV		 473 skb->dev = NULL;
474 skb_set_owner_r(skb, sk);
49ad9599 475
7fee226a
ED		 476 /* we escape from rcu protected region, make sure we dont leak
477 * a norefcounted dst
478 */
479 skb_dst_force(skb);
480
3b885787 481 spin_lock_irqsave(&list->lock, flags);
3bc3b96f 482 sock_skb_set_dropcount(sk, skb);
3b885787
NH		 483 __skb_queue_tail(list, skb);
484 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 485
486 if (!sock_flag(sk, SOCK_DEAD))
676d2369 487 sk->sk_data_ready(sk);
766e9037 488 return 0;
f0088a50 489}
e6afc8ac 490EXPORT_SYMBOL(__sock_queue_rcv_skb);
491
492int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
493{
494 int err;
495
496 err = sk_filter(sk, skb);
497 if (err)
498 return err;
499
500 return __sock_queue_rcv_skb(sk, skb);
501}
f0088a50
DV		 502EXPORT_SYMBOL(sock_queue_rcv_skb);
503
4f0c40d9 504int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
c3f24cfb 505 const int nested, unsigned int trim_cap, bool refcounted)
f0088a50
DV		 506{
507 int rc = NET_RX_SUCCESS;
508
4f0c40d9 509 if (sk_filter_trim_cap(sk, skb, trim_cap))
f0088a50
DV		 510 goto discard_and_relse;
511
512 skb->dev = NULL;
513
274f482d 514 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 515 atomic_inc(&sk->sk_drops);
516 goto discard_and_relse;
517 }
58a5a7b9
ACM		 518 if (nested)
519 bh_lock_sock_nested(sk);
520 else
521 bh_lock_sock(sk);
a5b5bb9a
IM		 522 if (!sock_owned_by_user(sk)) {
523 /*
524 * trylock + unlock semantics:
525 */
526 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
527
c57943a1 528 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 529
530 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 531 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 532 bh_unlock_sock(sk);
533 atomic_inc(&sk->sk_drops);
534 goto discard_and_relse;
535 }
536
f0088a50
DV		 537 bh_unlock_sock(sk);
538out:
c3f24cfb
ED		 539 if (refcounted)
540 sock_put(sk);
f0088a50
DV		 541 return rc;
542discard_and_relse:
543 kfree_skb(skb);
544 goto out;
545}
4f0c40d9 546EXPORT_SYMBOL(__sk_receive_skb);
f0088a50
DV		 547
548struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
549{
b6c6712a 550 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 551
552 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 553 sk_tx_queue_clear(sk);
9b8805a3 554 sk->sk_dst_pending_confirm = 0;
a9b3cd7f 555 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 556 dst_release(dst);
557 return NULL;
558 }
559
560 return dst;
561}
562EXPORT_SYMBOL(__sk_dst_check);
563
564struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
565{
566 struct dst_entry *dst = sk_dst_get(sk);
567
568 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
569 sk_dst_reset(sk);
570 dst_release(dst);
571 return NULL;
572 }
573
574 return dst;
575}
576EXPORT_SYMBOL(sk_dst_check);
577
f5dd3d0c 578static int sock_setbindtodevice_locked(struct sock *sk, int ifindex)
4878809f
DM		 579{
580 int ret = -ENOPROTOOPT;
581#ifdef CONFIG_NETDEVICES
3b1e0a65 582 struct net *net = sock_net(sk);
4878809f
DM		 583
584 /* Sorry... */
585 ret = -EPERM;
5e1fccc0 586 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 587 goto out;
588
f5dd3d0c
DH		 589 ret = -EINVAL;
590 if (ifindex < 0)
591 goto out;
592
593 sk->sk_bound_dev_if = ifindex;
594 if (sk->sk_prot->rehash)
595 sk->sk_prot->rehash(sk);
596 sk_dst_reset(sk);
597
598 ret = 0;
599
600out:
601#endif
602
603 return ret;
604}
605
606static int sock_setbindtodevice(struct sock *sk, char __user *optval,
607 int optlen)
608{
609 int ret = -ENOPROTOOPT;
610#ifdef CONFIG_NETDEVICES
611 struct net *net = sock_net(sk);
612 char devname[IFNAMSIZ];
613 int index;
614
4878809f
DM		 615 ret = -EINVAL;
616 if (optlen < 0)
617 goto out;
618
619 /* Bind this socket to a particular device like "eth0",
620 * as specified in the passed interface name. If the
621 * name is "" or the option length is zero the socket
622 * is not bound.
623 */
624 if (optlen > IFNAMSIZ - 1)
625 optlen = IFNAMSIZ - 1;
626 memset(devname, 0, sizeof(devname));
627
628 ret = -EFAULT;
629 if (copy_from_user(devname, optval, optlen))
630 goto out;
631
000ba2e4
DM		 632 index = 0;
633 if (devname[0] != '\0') {
bf8e56bf 634 struct net_device *dev;
4878809f 635
bf8e56bf
ED		 636 rcu_read_lock();
637 dev = dev_get_by_name_rcu(net, devname);
638 if (dev)
639 index = dev->ifindex;
640 rcu_read_unlock();
4878809f
DM		 641 ret = -ENODEV;
642 if (!dev)
643 goto out;
4878809f
DM		 644 }
645
646 lock_sock(sk);
f5dd3d0c 647 ret = sock_setbindtodevice_locked(sk, index);
4878809f
DM		 648 release_sock(sk);
649
4878809f
DM		 650out:
651#endif
652
653 return ret;
654}
655
c91f6df2
BH		 656static int sock_getbindtodevice(struct sock *sk, char __user *optval,
657 int __user *optlen, int len)
658{
659 int ret = -ENOPROTOOPT;
660#ifdef CONFIG_NETDEVICES
661 struct net *net = sock_net(sk);
c91f6df2 662 char devname[IFNAMSIZ];
c91f6df2
BH		 663
664 if (sk->sk_bound_dev_if == 0) {
665 len = 0;
666 goto zero;
667 }
668
669 ret = -EINVAL;
670 if (len < IFNAMSIZ)
671 goto out;
672
5dbe7c17
NS		 673 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
674 if (ret)
c91f6df2 675 goto out;
c91f6df2
BH		 676
677 len = strlen(devname) + 1;
678
679 ret = -EFAULT;
680 if (copy_to_user(optval, devname, len))
681 goto out;
682
683zero:
684 ret = -EFAULT;
685 if (put_user(len, optlen))
686 goto out;
687
688 ret = 0;
689
690out:
691#endif
692
693 return ret;
694}
695
c0ef877b
PE		 696static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
697{
698 if (valbool)
699 sock_set_flag(sk, bit);
700 else
701 sock_reset_flag(sk, bit);
702}
703
f60e5990 704bool sk_mc_loop(struct sock *sk)
705{
706 if (dev_recursion_level())
707 return false;
708 if (!sk)
709 return true;
710 switch (sk->sk_family) {
711 case AF_INET:
712 return inet_sk(sk)->mc_loop;
713#if IS_ENABLED(CONFIG_IPV6)
714 case AF_INET6:
715 return inet6_sk(sk)->mc_loop;
716#endif
717 }
718 WARN_ON(1);
719 return true;
720}
721EXPORT_SYMBOL(sk_mc_loop);
722
1da177e4
LT		 723/*
724 * This is meant for all protocols to use and covers goings on
725 * at the socket level. Everything here is generic.
726 */
727
728int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 729 char __user *optval, unsigned int optlen)
1da177e4 730{
80b14dee 731 struct sock_txtime sk_txtime;
2a91525c 732 struct sock *sk = sock->sk;
1da177e4
LT		 733 int val;
734 int valbool;
735 struct linger ling;
736 int ret = 0;
4ec93edb 737
1da177e4
LT		 738 /*
739 * Options without arguments
740 */
741
4878809f 742 if (optname == SO_BINDTODEVICE)
c91f6df2 743 return sock_setbindtodevice(sk, optval, optlen);
4878809f 744
e71a4783
SH		 745 if (optlen < sizeof(int))
746 return -EINVAL;
4ec93edb 747
1da177e4
LT		 748 if (get_user(val, (int __user *)optval))
749 return -EFAULT;
4ec93edb 750
2a91525c 751 valbool = val ? 1 : 0;
1da177e4
LT		 752
753 lock_sock(sk);
754
2a91525c 755 switch (optname) {
e71a4783 756 case SO_DEBUG:
2a91525c 757 if (val && !capable(CAP_NET_ADMIN))
e71a4783 758 ret = -EACCES;
2a91525c 759 else
c0ef877b 760 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 761 break;
762 case SO_REUSEADDR:
cdb8744d 763 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 764 break;
055dc21a
TH		 765 case SO_REUSEPORT:
766 sk->sk_reuseport = valbool;
767 break;
e71a4783 768 case SO_TYPE:
49c794e9 769 case SO_PROTOCOL:
0d6038ee 770 case SO_DOMAIN:
e71a4783
SH		 771 case SO_ERROR:
772 ret = -ENOPROTOOPT;
773 break;
774 case SO_DONTROUTE:
c0ef877b 775 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
0fbe82e6 776 sk_dst_reset(sk);
e71a4783
SH		 777 break;
778 case SO_BROADCAST:
779 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
780 break;
781 case SO_SNDBUF:
782 /* Don't error on this BSD doesn't and if you think
82981930
ED		 783 * about it this is right. Otherwise apps have to
784 * play 'guess the biggest size' games. RCVBUF/SNDBUF
785 * are treated in BSD as hints
786 */
787 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 788set_sndbuf:
4057765f
GN		 789 /* Ensure val * 2 fits into an int, to prevent max_t()
790 * from treating it as a negative value.
791 */
792 val = min_t(int, val, INT_MAX / 2);
e71a4783 793 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
b98b0bc8 794 sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF);
82981930 795 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 796 sk->sk_write_space(sk);
797 break;
1da177e4 798
e71a4783
SH		 799 case SO_SNDBUFFORCE:
800 if (!capable(CAP_NET_ADMIN)) {
801 ret = -EPERM;
802 break;
803 }
4057765f
GN		 804
805 /* No negative values (to prevent underflow, as val will be
806 * multiplied by 2).
807 */
808 if (val < 0)
809 val = 0;
e71a4783 810 goto set_sndbuf;
b0573dea 811
e71a4783
SH		 812 case SO_RCVBUF:
813 /* Don't error on this BSD doesn't and if you think
82981930
ED		 814 * about it this is right. Otherwise apps have to
815 * play 'guess the biggest size' games. RCVBUF/SNDBUF
816 * are treated in BSD as hints
817 */
818 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 819set_rcvbuf:
4057765f
GN		 820 /* Ensure val * 2 fits into an int, to prevent max_t()
821 * from treating it as a negative value.
822 */
823 val = min_t(int, val, INT_MAX / 2);
e71a4783
SH		 824 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
825 /*
826 * We double it on the way in to account for
827 * "struct sk_buff" etc. overhead. Applications
828 * assume that the SO_RCVBUF setting they make will
829 * allow that much actual data to be received on that
830 * socket.
831 *
832 * Applications are unaware that "struct sk_buff" and
833 * other overheads allocate from the receive buffer
834 * during socket buffer allocation.
835 *
836 * And after considering the possible alternatives,
837 * returning the value we actually used in getsockopt
838 * is the most desirable behavior.
839 */
b98b0bc8 840 sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 841 break;
842
843 case SO_RCVBUFFORCE:
844 if (!capable(CAP_NET_ADMIN)) {
845 ret = -EPERM;
1da177e4 846 break;
e71a4783 847 }
4057765f
GN		 848
849 /* No negative values (to prevent underflow, as val will be
850 * multiplied by 2).
851 */
852 if (val < 0)
853 val = 0;
e71a4783 854 goto set_rcvbuf;
1da177e4 855
e71a4783 856 case SO_KEEPALIVE:
4b9d07a4
UB		 857 if (sk->sk_prot->keepalive)
858 sk->sk_prot->keepalive(sk, valbool);
e71a4783
SH		 859 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
860 break;
861
862 case SO_OOBINLINE:
863 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
864 break;
865
866 case SO_NO_CHECK:
28448b80 867 sk->sk_no_check_tx = valbool;
e71a4783
SH		 868 break;
869
870 case SO_PRIORITY:
5e1fccc0
EB		 871 if ((val >= 0 && val <= 6) ||
872 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 873 sk->sk_priority = val;
874 else
875 ret = -EPERM;
876 break;
877
878 case SO_LINGER:
879 if (optlen < sizeof(ling)) {
880 ret = -EINVAL; /* 1003.1g */
1da177e4 881 break;
e71a4783 882 }
2a91525c 883 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 884 ret = -EFAULT;
1da177e4 885 break;
e71a4783
SH		 886 }
887 if (!ling.l_onoff)
888 sock_reset_flag(sk, SOCK_LINGER);
889 else {
1da177e4 890#if (BITS_PER_LONG == 32)
e71a4783
SH		 891 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
892 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 893 else
e71a4783
SH		 894#endif
895 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
896 sock_set_flag(sk, SOCK_LINGER);
897 }
898 break;
899
900 case SO_BSDCOMPAT:
901 sock_warn_obsolete_bsdism("setsockopt");
902 break;
903
904 case SO_PASSCRED:
905 if (valbool)
906 set_bit(SOCK_PASSCRED, &sock->flags);
907 else
908 clear_bit(SOCK_PASSCRED, &sock->flags);
909 break;
910
7f1bc6e9 911 case SO_TIMESTAMP_OLD:
887feae3 912 case SO_TIMESTAMP_NEW:
7f1bc6e9 913 case SO_TIMESTAMPNS_OLD:
887feae3 914 case SO_TIMESTAMPNS_NEW:
e71a4783 915 if (valbool) {
887feae3
DD		 916 if (optname == SO_TIMESTAMP_NEW || optname == SO_TIMESTAMPNS_NEW)
917 sock_set_flag(sk, SOCK_TSTAMP_NEW);
918 else
919 sock_reset_flag(sk, SOCK_TSTAMP_NEW);
920
921 if (optname == SO_TIMESTAMP_OLD || optname == SO_TIMESTAMP_NEW)
92f37fd2
ED		 922 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
923 else
924 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 925 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 926 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 927 } else {
e71a4783 928 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2 929 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
887feae3 930 sock_reset_flag(sk, SOCK_TSTAMP_NEW);
92f37fd2 931 }
e71a4783
SH		 932 break;
933
9718475e
DD		 934 case SO_TIMESTAMPING_NEW:
935 sock_set_flag(sk, SOCK_TSTAMP_NEW);
ff7653f9 936 /* fall through */
7f1bc6e9 937 case SO_TIMESTAMPING_OLD:
20d49473 938 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 939 ret = -EINVAL;
20d49473
PO		 940 break;
941 }
b245be1f 942
09c2d251 943 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765 944 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
ac5cc977
WC		 945 if (sk->sk_protocol == IPPROTO_TCP &&
946 sk->sk_type == SOCK_STREAM) {
6db8b963
SHY		 947 if ((1 << sk->sk_state) &
948 (TCPF_CLOSE | TCPF_LISTEN)) {
4ed2d765
WB		 949 ret = -EINVAL;
950 break;
951 }
952 sk->sk_tskey = tcp_sk(sk)->snd_una;
953 } else {
954 sk->sk_tskey = 0;
955 }
956 }
1c885808
FY		 957
958 if (val & SOF_TIMESTAMPING_OPT_STATS &&
959 !(val & SOF_TIMESTAMPING_OPT_TSONLY)) {
960 ret = -EINVAL;
961 break;
962 }
963
b9f40e21 964 sk->sk_tsflags = val;
20d49473
PO		 965 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
966 sock_enable_timestamp(sk,
967 SOCK_TIMESTAMPING_RX_SOFTWARE);
9718475e
DD		 968 else {
969 if (optname == SO_TIMESTAMPING_NEW)
970 sock_reset_flag(sk, SOCK_TSTAMP_NEW);
971
20d49473 972 sock_disable_timestamp(sk,
08e29af3 973 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
9718475e 974 }
20d49473
PO		 975 break;
976
e71a4783
SH		 977 case SO_RCVLOWAT:
978 if (val < 0)
979 val = INT_MAX;
d1361840
ED		 980 if (sock->ops->set_rcvlowat)
981 ret = sock->ops->set_rcvlowat(sk, val);
982 else
983 sk->sk_rcvlowat = val ? : 1;
e71a4783
SH		 984 break;
985
45bdc661 986 case SO_RCVTIMEO_OLD:
a9beb86a
DD		 987 case SO_RCVTIMEO_NEW:
988 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen, optname == SO_RCVTIMEO_OLD);
e71a4783
SH		 989 break;
990
45bdc661 991 case SO_SNDTIMEO_OLD:
a9beb86a
DD		 992 case SO_SNDTIMEO_NEW:
993 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen, optname == SO_SNDTIMEO_OLD);
e71a4783 994 break;
1da177e4 995
e71a4783
SH		 996 case SO_ATTACH_FILTER:
997 ret = -EINVAL;
998 if (optlen == sizeof(struct sock_fprog)) {
999 struct sock_fprog fprog;
1da177e4 1000
e71a4783
SH		 1001 ret = -EFAULT;
1002 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 1003 break;
e71a4783
SH		 1004
1005 ret = sk_attach_filter(&fprog, sk);
1006 }
1007 break;
1008
89aa0758
AS		 1009 case SO_ATTACH_BPF:
1010 ret = -EINVAL;
1011 if (optlen == sizeof(u32)) {
1012 u32 ufd;
1013
1014 ret = -EFAULT;
1015 if (copy_from_user(&ufd, optval, sizeof(ufd)))
1016 break;
1017
1018 ret = sk_attach_bpf(ufd, sk);
1019 }
1020 break;
1021
538950a1
CG		 1022 case SO_ATTACH_REUSEPORT_CBPF:
1023 ret = -EINVAL;
1024 if (optlen == sizeof(struct sock_fprog)) {
1025 struct sock_fprog fprog;
1026
1027 ret = -EFAULT;
1028 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1029 break;
1030
1031 ret = sk_reuseport_attach_filter(&fprog, sk);
1032 }
1033 break;
1034
1035 case SO_ATTACH_REUSEPORT_EBPF:
1036 ret = -EINVAL;
1037 if (optlen == sizeof(u32)) {
1038 u32 ufd;
1039
1040 ret = -EFAULT;
1041 if (copy_from_user(&ufd, optval, sizeof(ufd)))
1042 break;
1043
1044 ret = sk_reuseport_attach_bpf(ufd, sk);
1045 }
1046 break;
1047
e71a4783 1048 case SO_DETACH_FILTER:
55b33325 1049 ret = sk_detach_filter(sk);
e71a4783 1050 break;
1da177e4 1051
d59577b6
VB		 1052 case SO_LOCK_FILTER:
1053 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
1054 ret = -EPERM;
1055 else
1056 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
1057 break;
1058
e71a4783
SH		 1059 case SO_PASSSEC:
1060 if (valbool)
1061 set_bit(SOCK_PASSSEC, &sock->flags);
1062 else
1063 clear_bit(SOCK_PASSSEC, &sock->flags);
1064 break;
4a19ec58 1065 case SO_MARK:
50254256 1066 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
4a19ec58 1067 ret = -EPERM;
50254256 1068 } else if (val != sk->sk_mark) {
4a19ec58 1069 sk->sk_mark = val;
50254256
DB		 1070 sk_dst_reset(sk);
1071 }
4a19ec58 1072 break;
877ce7c1 1073
3b885787 1074 case SO_RXQ_OVFL:
8083f0fc 1075 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 1076 break;
6e3e939f
JB		 1077
1078 case SO_WIFI_STATUS:
1079 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
1080 break;
1081
ef64a54f
PE		 1082 case SO_PEEK_OFF:
1083 if (sock->ops->set_peek_off)
12663bfc 1084 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 1085 else
1086 ret = -EOPNOTSUPP;
1087 break;
3bdc0eba
BG		 1088
1089 case SO_NOFCS:
1090 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
1091 break;
1092
7d4c04fc
KJ		 1093 case SO_SELECT_ERR_QUEUE:
1094 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
1095 break;
1096
e0d1095a 1097#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1098 case SO_BUSY_POLL:
dafcc438
ET		 1099 /* allow unprivileged users to decrease the value */
1100 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
1101 ret = -EPERM;
1102 else {
1103 if (val < 0)
1104 ret = -EINVAL;
1105 else
1106 sk->sk_ll_usec = val;
1107 }
1108 break;
1109#endif
62748f32
ED		 1110
1111 case SO_MAX_PACING_RATE:
6bdef102
ED		 1112 {
1113 unsigned long ulval = (val == ~0U) ? ~0UL : val;
1114
1115 if (sizeof(ulval) != sizeof(val) &&
1116 optlen >= sizeof(ulval) &&
1117 get_user(ulval, (unsigned long __user *)optval)) {
1118 ret = -EFAULT;
1119 break;
1120 }
1121 if (ulval != ~0UL)
218af599
ED		 1122 cmpxchg(&sk->sk_pacing_status,
1123 SK_PACING_NONE,
1124 SK_PACING_NEEDED);
6bdef102
ED		 1125 sk->sk_max_pacing_rate = ulval;
1126 sk->sk_pacing_rate = min(sk->sk_pacing_rate, ulval);
62748f32 1127 break;
6bdef102 1128 }
70da268b
ED		 1129 case SO_INCOMING_CPU:
1130 sk->sk_incoming_cpu = val;
1131 break;
1132
a87cb3e4
TH		 1133 case SO_CNX_ADVICE:
1134 if (val == 1)
1135 dst_negative_advice(sk);
1136 break;
76851d12
WB		 1137
1138 case SO_ZEROCOPY:
28190752 1139 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) {
b5947e5d
WB		 1140 if (!((sk->sk_type == SOCK_STREAM &&
1141 sk->sk_protocol == IPPROTO_TCP) ||
1142 (sk->sk_type == SOCK_DGRAM &&
1143 sk->sk_protocol == IPPROTO_UDP)))
28190752 1144 ret = -ENOTSUPP;
28190752 1145 } else if (sk->sk_family != PF_RDS) {
76851d12 1146 ret = -ENOTSUPP;
28190752
SV		 1147 }
1148 if (!ret) {
1149 if (val < 0 || val > 1)
1150 ret = -EINVAL;
1151 else
1152 sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool);
28190752 1153 }
334e6413
JSP		 1154 break;
1155
80b14dee
RC		 1156 case SO_TXTIME:
1157 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1158 ret = -EPERM;
1159 } else if (optlen != sizeof(struct sock_txtime)) {
1160 ret = -EINVAL;
1161 } else if (copy_from_user(&sk_txtime, optval,
1162 sizeof(struct sock_txtime))) {
1163 ret = -EFAULT;
1164 } else if (sk_txtime.flags & ~SOF_TXTIME_FLAGS_MASK) {
1165 ret = -EINVAL;
1166 } else {
1167 sock_valbool_flag(sk, SOCK_TXTIME, true);
1168 sk->sk_clockid = sk_txtime.clockid;
1169 sk->sk_txtime_deadline_mode =
1170 !!(sk_txtime.flags & SOF_TXTIME_DEADLINE_MODE);
4b15c707
JSP		 1171 sk->sk_txtime_report_errors =
1172 !!(sk_txtime.flags & SOF_TXTIME_REPORT_ERRORS);
80b14dee
RC		 1173 }
1174 break;
1175
f5dd3d0c
DH		 1176 case SO_BINDTOIFINDEX:
1177 ret = sock_setbindtodevice_locked(sk, val);
1178 break;
1179
e71a4783
SH		 1180 default:
1181 ret = -ENOPROTOOPT;
1182 break;
4ec93edb 1183 }
1da177e4
LT		 1184 release_sock(sk);
1185 return ret;
1186}
2a91525c 1187EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 1188
1189
8f09898b 1190static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1191 struct ucred *ucred)
3f551f94
EB		 1192{
1193 ucred->pid = pid_vnr(pid);
1194 ucred->uid = ucred->gid = -1;
1195 if (cred) {
1196 struct user_namespace *current_ns = current_user_ns();
1197
b2e4f544
EB		 1198 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1199 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 1200 }
1201}
1202
28b5ba2a
DH		 1203static int groups_to_user(gid_t __user *dst, const struct group_info *src)
1204{
1205 struct user_namespace *user_ns = current_user_ns();
1206 int i;
1207
1208 for (i = 0; i < src->ngroups; i++)
1209 if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i))
1210 return -EFAULT;
1211
1212 return 0;
1213}
1214
1da177e4
LT		 1215int sock_getsockopt(struct socket *sock, int level, int optname,
1216 char __user *optval, int __user *optlen)
1217{
1218 struct sock *sk = sock->sk;
4ec93edb 1219
e71a4783 1220 union {
4ec93edb 1221 int val;
5daab9db 1222 u64 val64;
677f136c 1223 unsigned long ulval;
4ec93edb 1224 struct linger ling;
fe0c72f3
AB		 1225 struct old_timeval32 tm32;
1226 struct __kernel_old_timeval tm;
a9beb86a 1227 struct __kernel_sock_timeval stm;
80b14dee 1228 struct sock_txtime txtime;
1da177e4 1229 } v;
4ec93edb 1230
4d0392be 1231 int lv = sizeof(int);
1da177e4 1232 int len;
4ec93edb 1233
e71a4783 1234 if (get_user(len, optlen))
4ec93edb 1235 return -EFAULT;
e71a4783 1236 if (len < 0)
1da177e4 1237 return -EINVAL;
4ec93edb 1238
50fee1de 1239 memset(&v, 0, sizeof(v));
df0bca04 1240
2a91525c 1241 switch (optname) {
e71a4783
SH		 1242 case SO_DEBUG:
1243 v.val = sock_flag(sk, SOCK_DBG);
1244 break;
1245
1246 case SO_DONTROUTE:
1247 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1248 break;
1249
1250 case SO_BROADCAST:
1b23a5df 1251 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1252 break;
1253
1254 case SO_SNDBUF:
1255 v.val = sk->sk_sndbuf;
1256 break;
1257
1258 case SO_RCVBUF:
1259 v.val = sk->sk_rcvbuf;
1260 break;
1261
1262 case SO_REUSEADDR:
1263 v.val = sk->sk_reuse;
1264 break;
1265
055dc21a
TH		 1266 case SO_REUSEPORT:
1267 v.val = sk->sk_reuseport;
1268 break;
1269
e71a4783 1270 case SO_KEEPALIVE:
1b23a5df 1271 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1272 break;
1273
1274 case SO_TYPE:
1275 v.val = sk->sk_type;
1276 break;
1277
49c794e9
JE		 1278 case SO_PROTOCOL:
1279 v.val = sk->sk_protocol;
1280 break;
1281
0d6038ee
JE		 1282 case SO_DOMAIN:
1283 v.val = sk->sk_family;
1284 break;
1285
e71a4783
SH		 1286 case SO_ERROR:
1287 v.val = -sock_error(sk);
2a91525c 1288 if (v.val == 0)
e71a4783
SH		 1289 v.val = xchg(&sk->sk_err_soft, 0);
1290 break;
1291
1292 case SO_OOBINLINE:
1b23a5df 1293 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1294 break;
1295
1296 case SO_NO_CHECK:
28448b80 1297 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1298 break;
1299
1300 case SO_PRIORITY:
1301 v.val = sk->sk_priority;
1302 break;
1303
1304 case SO_LINGER:
1305 lv = sizeof(v.ling);
1b23a5df 1306 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1307 v.ling.l_linger = sk->sk_lingertime / HZ;
1308 break;
1309
1310 case SO_BSDCOMPAT:
1311 sock_warn_obsolete_bsdism("getsockopt");
1312 break;
1313
7f1bc6e9 1314 case SO_TIMESTAMP_OLD:
92f37fd2 1315 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
887feae3 1316 !sock_flag(sk, SOCK_TSTAMP_NEW) &&
92f37fd2
ED		 1317 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1318 break;
1319
7f1bc6e9 1320 case SO_TIMESTAMPNS_OLD:
887feae3
DD		 1321 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && !sock_flag(sk, SOCK_TSTAMP_NEW);
1322 break;
1323
1324 case SO_TIMESTAMP_NEW:
1325 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && sock_flag(sk, SOCK_TSTAMP_NEW);
1326 break;
1327
1328 case SO_TIMESTAMPNS_NEW:
1329 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && sock_flag(sk, SOCK_TSTAMP_NEW);
e71a4783
SH		 1330 break;
1331
7f1bc6e9 1332 case SO_TIMESTAMPING_OLD:
b9f40e21 1333 v.val = sk->sk_tsflags;
20d49473
PO		 1334 break;
1335
a9beb86a
DD		 1336 case SO_RCVTIMEO_OLD:
1337 case SO_RCVTIMEO_NEW:
1338 lv = sock_get_timeout(sk->sk_rcvtimeo, &v, SO_RCVTIMEO_OLD == optname);
e71a4783
SH		 1339 break;
1340
a9beb86a
DD		 1341 case SO_SNDTIMEO_OLD:
1342 case SO_SNDTIMEO_NEW:
1343 lv = sock_get_timeout(sk->sk_sndtimeo, &v, SO_SNDTIMEO_OLD == optname);
e71a4783 1344 break;
1da177e4 1345
e71a4783
SH		 1346 case SO_RCVLOWAT:
1347 v.val = sk->sk_rcvlowat;
1348 break;
1da177e4 1349
e71a4783 1350 case SO_SNDLOWAT:
2a91525c 1351 v.val = 1;
e71a4783 1352 break;
1da177e4 1353
e71a4783 1354 case SO_PASSCRED:
82981930 1355 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1356 break;
1da177e4 1357
e71a4783 1358 case SO_PEERCRED:
109f6e39
EB		 1359 {
1360 struct ucred peercred;
1361 if (len > sizeof(peercred))
1362 len = sizeof(peercred);
1363 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1364 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1365 return -EFAULT;
1366 goto lenout;
109f6e39 1367 }
1da177e4 1368
28b5ba2a
DH		 1369 case SO_PEERGROUPS:
1370 {
1371 int ret, n;
1372
1373 if (!sk->sk_peer_cred)
1374 return -ENODATA;
1375
1376 n = sk->sk_peer_cred->group_info->ngroups;
1377 if (len < n * sizeof(gid_t)) {
1378 len = n * sizeof(gid_t);
1379 return put_user(len, optlen) ? -EFAULT : -ERANGE;
1380 }
1381 len = n * sizeof(gid_t);
1382
1383 ret = groups_to_user((gid_t __user *)optval,
1384 sk->sk_peer_cred->group_info);
1385 if (ret)
1386 return ret;
1387 goto lenout;
1388 }
1389
e71a4783
SH		 1390 case SO_PEERNAME:
1391 {
1392 char address[128];
1393
9b2c45d4
DV		 1394 lv = sock->ops->getname(sock, (struct sockaddr *)address, 2);
1395 if (lv < 0)
e71a4783
SH		 1396 return -ENOTCONN;
1397 if (lv < len)
1398 return -EINVAL;
1399 if (copy_to_user(optval, address, len))
1400 return -EFAULT;
1401 goto lenout;
1402 }
1da177e4 1403
e71a4783
SH		 1404 /* Dubious BSD thing... Probably nobody even uses it, but
1405 * the UNIX standard wants it for whatever reason... -DaveM
1406 */
1407 case SO_ACCEPTCONN:
1408 v.val = sk->sk_state == TCP_LISTEN;
1409 break;
1da177e4 1410
e71a4783 1411 case SO_PASSSEC:
82981930 1412 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1413 break;
877ce7c1 1414
e71a4783
SH		 1415 case SO_PEERSEC:
1416 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1417
4a19ec58
LAT		 1418 case SO_MARK:
1419 v.val = sk->sk_mark;
1420 break;
1421
3b885787 1422 case SO_RXQ_OVFL:
1b23a5df 1423 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1424 break;
1425
6e3e939f 1426 case SO_WIFI_STATUS:
1b23a5df 1427 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1428 break;
1429
ef64a54f
PE		 1430 case SO_PEEK_OFF:
1431 if (!sock->ops->set_peek_off)
1432 return -EOPNOTSUPP;
1433
1434 v.val = sk->sk_peek_off;
1435 break;
bc2f7996 1436 case SO_NOFCS:
1b23a5df 1437 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1438 break;
c91f6df2 1439
f7b86bfe 1440 case SO_BINDTODEVICE:
c91f6df2
BH		 1441 return sock_getbindtodevice(sk, optval, optlen, len);
1442
a8fc9277
PE		 1443 case SO_GET_FILTER:
1444 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1445 if (len < 0)
1446 return len;
1447
1448 goto lenout;
c91f6df2 1449
d59577b6
VB		 1450 case SO_LOCK_FILTER:
1451 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1452 break;
1453
ea02f941
MS		 1454 case SO_BPF_EXTENSIONS:
1455 v.val = bpf_tell_extensions();
1456 break;
1457
7d4c04fc
KJ		 1458 case SO_SELECT_ERR_QUEUE:
1459 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1460 break;
1461
e0d1095a 1462#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1463 case SO_BUSY_POLL:
dafcc438
ET		 1464 v.val = sk->sk_ll_usec;
1465 break;
1466#endif
1467
62748f32 1468 case SO_MAX_PACING_RATE:
677f136c
ED		 1469 if (sizeof(v.ulval) != sizeof(v.val) && len >= sizeof(v.ulval)) {
1470 lv = sizeof(v.ulval);
1471 v.ulval = sk->sk_max_pacing_rate;
1472 } else {
1473 /* 32bit version */
1474 v.val = min_t(unsigned long, sk->sk_max_pacing_rate, ~0U);
1475 }
62748f32
ED		 1476 break;
1477
2c8c56e1
ED		 1478 case SO_INCOMING_CPU:
1479 v.val = sk->sk_incoming_cpu;
1480 break;
1481
a2d133b1
JH		 1482 case SO_MEMINFO:
1483 {
1484 u32 meminfo[SK_MEMINFO_VARS];
1485
1486 if (get_user(len, optlen))
1487 return -EFAULT;
1488
1489 sk_get_meminfo(sk, meminfo);
1490
1491 len = min_t(unsigned int, len, sizeof(meminfo));
1492 if (copy_to_user(optval, &meminfo, len))
1493 return -EFAULT;
1494
1495 goto lenout;
1496 }
6d433902
SS		 1497
1498#ifdef CONFIG_NET_RX_BUSY_POLL
1499 case SO_INCOMING_NAPI_ID:
1500 v.val = READ_ONCE(sk->sk_napi_id);
1501
1502 /* aggregate non-NAPI IDs down to 0 */
1503 if (v.val < MIN_NAPI_ID)
1504 v.val = 0;
1505
1506 break;
1507#endif
1508
5daab9db
CF		 1509 case SO_COOKIE:
1510 lv = sizeof(u64);
1511 if (len < lv)
1512 return -EINVAL;
1513 v.val64 = sock_gen_cookie(sk);
1514 break;
1515
76851d12
WB		 1516 case SO_ZEROCOPY:
1517 v.val = sock_flag(sk, SOCK_ZEROCOPY);
1518 break;
1519
80b14dee
RC		 1520 case SO_TXTIME:
1521 lv = sizeof(v.txtime);
1522 v.txtime.clockid = sk->sk_clockid;
1523 v.txtime.flags |= sk->sk_txtime_deadline_mode ?
1524 SOF_TXTIME_DEADLINE_MODE : 0;
4b15c707
JSP		 1525 v.txtime.flags |= sk->sk_txtime_report_errors ?
1526 SOF_TXTIME_REPORT_ERRORS : 0;
80b14dee
RC		 1527 break;
1528
f5dd3d0c
DH		 1529 case SO_BINDTOIFINDEX:
1530 v.val = sk->sk_bound_dev_if;
1531 break;
1532
e71a4783 1533 default:
443b5991
YH		 1534 /* We implement the SO_SNDLOWAT etc to not be settable
1535 * (1003.1g 7).
1536 */
e71a4783 1537 return -ENOPROTOOPT;
1da177e4 1538 }
e71a4783 1539
1da177e4
LT		 1540 if (len > lv)
1541 len = lv;
1542 if (copy_to_user(optval, &v, len))
1543 return -EFAULT;
1544lenout:
4ec93edb
YH		 1545 if (put_user(len, optlen))
1546 return -EFAULT;
1547 return 0;
1da177e4
LT		 1548}
1549
a5b5bb9a
IM		 1550/*
1551 * Initialize an sk_lock.
1552 *
1553 * (We also register the sk_lock with the lock validator.)
1554 */
b6f99a21 1555static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1556{
cdfbabfb
DH		 1557 if (sk->sk_kern_sock)
1558 sock_lock_init_class_and_name(
1559 sk,
1560 af_family_kern_slock_key_strings[sk->sk_family],
1561 af_family_kern_slock_keys + sk->sk_family,
1562 af_family_kern_key_strings[sk->sk_family],
1563 af_family_kern_keys + sk->sk_family);
1564 else
1565 sock_lock_init_class_and_name(
1566 sk,
ed07536e
PZ		 1567 af_family_slock_key_strings[sk->sk_family],
1568 af_family_slock_keys + sk->sk_family,
1569 af_family_key_strings[sk->sk_family],
1570 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1571}
1572
4dc6dc71
ED		 1573/*
1574 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1575 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1576 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1577 */
f1a6c4da
PE		 1578static void sock_copy(struct sock *nsk, const struct sock *osk)
1579{
1580#ifdef CONFIG_SECURITY_NETWORK
1581 void *sptr = nsk->sk_security;
1582#endif
68835aba
ED		 1583 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1584
1585 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1586 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1587
f1a6c4da
PE		 1588#ifdef CONFIG_SECURITY_NETWORK
1589 nsk->sk_security = sptr;
1590 security_sk_clone(osk, nsk);
1591#endif
1592}
1593
2e4afe7b
PE		 1594static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1595 int family)
c308c1b2
PE		 1596{
1597 struct sock *sk;
1598 struct kmem_cache *slab;
1599
1600 slab = prot->slab;
e912b114
ED		 1601 if (slab != NULL) {
1602 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1603 if (!sk)
1604 return sk;
ba2489b0
ED		 1605 if (priority & __GFP_ZERO)
1606 sk_prot_clear_nulls(sk, prot->obj_size);
fcbdf09d 1607 } else
c308c1b2
PE		 1608 sk = kmalloc(prot->obj_size, priority);
1609
2e4afe7b
PE		 1610 if (sk != NULL) {
1611 if (security_sk_alloc(sk, family, priority))
1612 goto out_free;
1613
1614 if (!try_module_get(prot->owner))
1615 goto out_free_sec;
e022f0b4 1616 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1617 }
1618
c308c1b2 1619 return sk;
2e4afe7b
PE		 1620
1621out_free_sec:
1622 security_sk_free(sk);
1623out_free:
1624 if (slab != NULL)
1625 kmem_cache_free(slab, sk);
1626 else
1627 kfree(sk);
1628 return NULL;
c308c1b2
PE		 1629}
1630
1631static void sk_prot_free(struct proto *prot, struct sock *sk)
1632{
1633 struct kmem_cache *slab;
2e4afe7b 1634 struct module *owner;
c308c1b2 1635
2e4afe7b 1636 owner = prot->owner;
c308c1b2 1637 slab = prot->slab;
2e4afe7b 1638
bd1060a1 1639 cgroup_sk_free(&sk->sk_cgrp_data);
2d758073 1640 mem_cgroup_sk_free(sk);
2e4afe7b 1641 security_sk_free(sk);
c308c1b2
PE		 1642 if (slab != NULL)
1643 kmem_cache_free(slab, sk);
1644 else
1645 kfree(sk);
2e4afe7b 1646 module_put(owner);
c308c1b2
PE		 1647}
1648
1da177e4
LT		 1649/**
1650 * sk_alloc - All socket objects are allocated here
c4ea43c5 1651 * @net: the applicable net namespace
4dc3b16b
PP		 1652 * @family: protocol family
1653 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1654 * @prot: struct proto associated with this new sock instance
11aa9c28 1655 * @kern: is this to be a kernel socket?
1da177e4 1656 */
1b8d7ae4 1657struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
11aa9c28 1658 struct proto *prot, int kern)
1da177e4 1659{
c308c1b2 1660 struct sock *sk;
1da177e4 1661
154adbc8 1662 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1663 if (sk) {
154adbc8
PE		 1664 sk->sk_family = family;
1665 /*
1666 * See comment in struct sock definition to understand
1667 * why we need sk_prot_creator -acme
1668 */
1669 sk->sk_prot = sk->sk_prot_creator = prot;
cdfbabfb 1670 sk->sk_kern_sock = kern;
154adbc8 1671 sock_lock_init(sk);
26abe143 1672 sk->sk_net_refcnt = kern ? 0 : 1;
648845ab 1673 if (likely(sk->sk_net_refcnt)) {
26abe143 1674 get_net(net);
648845ab
TZ		 1675 sock_inuse_add(net, 1);
1676 }
1677
26abe143 1678 sock_net_set(sk, net);
14afee4b 1679 refcount_set(&sk->sk_wmem_alloc, 1);
f8451725 1680
2d758073 1681 mem_cgroup_sk_alloc(sk);
d979a39d 1682 cgroup_sk_alloc(&sk->sk_cgrp_data);
2a56a1fe
TH		 1683 sock_update_classid(&sk->sk_cgrp_data);
1684 sock_update_netprioidx(&sk->sk_cgrp_data);
1da177e4 1685 }
a79af59e 1686
2e4afe7b 1687 return sk;
1da177e4 1688}
2a91525c 1689EXPORT_SYMBOL(sk_alloc);
1da177e4 1690
a4298e45
ED		 1691/* Sockets having SOCK_RCU_FREE will call this function after one RCU
1692 * grace period. This is the case for UDP sockets and TCP listeners.
1693 */
1694static void __sk_destruct(struct rcu_head *head)
1da177e4 1695{
a4298e45 1696 struct sock *sk = container_of(head, struct sock, sk_rcu);
1da177e4 1697 struct sk_filter *filter;
1da177e4
LT		 1698
1699 if (sk->sk_destruct)
1700 sk->sk_destruct(sk);
1701
a898def2 1702 filter = rcu_dereference_check(sk->sk_filter,
14afee4b 1703 refcount_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1704 if (filter) {
309dd5fc 1705 sk_filter_uncharge(sk, filter);
a9b3cd7f 1706 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4 1707 }
538950a1
CG		 1708 if (rcu_access_pointer(sk->sk_reuseport_cb))
1709 reuseport_detach_sock(sk);
1da177e4 1710
08e29af3 1711 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4 1712
6ac99e8f
MKL		 1713#ifdef CONFIG_BPF_SYSCALL
1714 bpf_sk_storage_free(sk);
1715#endif
1716
1da177e4 1717 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1718 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1719 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1720
22a0e18e
ED		 1721 if (sk->sk_frag.page) {
1722 put_page(sk->sk_frag.page);
1723 sk->sk_frag.page = NULL;
1724 }
1725
109f6e39
EB		 1726 if (sk->sk_peer_cred)
1727 put_cred(sk->sk_peer_cred);
1728 put_pid(sk->sk_peer_pid);
26abe143
EB		 1729 if (likely(sk->sk_net_refcnt))
1730 put_net(sock_net(sk));
c308c1b2 1731 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1732}
2b85a34e 1733
a4298e45
ED		 1734void sk_destruct(struct sock *sk)
1735{
1736 if (sock_flag(sk, SOCK_RCU_FREE))
1737 call_rcu(&sk->sk_rcu, __sk_destruct);
1738 else
1739 __sk_destruct(&sk->sk_rcu);
1740}
1741
eb4cb008
CG		 1742static void __sk_free(struct sock *sk)
1743{
648845ab
TZ		 1744 if (likely(sk->sk_net_refcnt))
1745 sock_inuse_add(sock_net(sk), -1);
1746
9709020c 1747 if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk)))
eb4cb008
CG		 1748 sock_diag_broadcast_destroy(sk);
1749 else
1750 sk_destruct(sk);
1751}
1752
2b85a34e
ED		 1753void sk_free(struct sock *sk)
1754{
1755 /*
25985edc 1756 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1757 * some packets are still in some tx queue.
1758 * If not null, sock_wfree() will call __sk_free(sk) later
1759 */
14afee4b 1760 if (refcount_dec_and_test(&sk->sk_wmem_alloc))
2b85a34e
ED		 1761 __sk_free(sk);
1762}
2a91525c 1763EXPORT_SYMBOL(sk_free);
1da177e4 1764
581319c5
PA		 1765static void sk_init_common(struct sock *sk)
1766{
1767 skb_queue_head_init(&sk->sk_receive_queue);
1768 skb_queue_head_init(&sk->sk_write_queue);
1769 skb_queue_head_init(&sk->sk_error_queue);
1770
1771 rwlock_init(&sk->sk_callback_lock);
1772 lockdep_set_class_and_name(&sk->sk_receive_queue.lock,
1773 af_rlock_keys + sk->sk_family,
1774 af_family_rlock_key_strings[sk->sk_family]);
1775 lockdep_set_class_and_name(&sk->sk_write_queue.lock,
1776 af_wlock_keys + sk->sk_family,
1777 af_family_wlock_key_strings[sk->sk_family]);
1778 lockdep_set_class_and_name(&sk->sk_error_queue.lock,
1779 af_elock_keys + sk->sk_family,
1780 af_family_elock_key_strings[sk->sk_family]);
1781 lockdep_set_class_and_name(&sk->sk_callback_lock,
1782 af_callback_keys + sk->sk_family,
1783 af_family_clock_key_strings[sk->sk_family]);
1784}
1785
e56c57d0
ED		 1786/**
1787 * sk_clone_lock - clone a socket, and lock its clone
1788 * @sk: the socket to clone
1789 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1790 *
1791 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1792 */
1793struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1794{
8fd1d178 1795 struct sock *newsk;
278571ba 1796 bool is_charged = true;
87d11ceb 1797
8fd1d178 1798 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1799 if (newsk != NULL) {
1800 struct sk_filter *filter;
1801
892c141e 1802 sock_copy(newsk, sk);
87d11ceb 1803
9d538fa6
CP		 1804 newsk->sk_prot_creator = sk->sk_prot;
1805
87d11ceb 1806 /* SANITY */
8a681736
SV		 1807 if (likely(newsk->sk_net_refcnt))
1808 get_net(sock_net(newsk));
87d11ceb
ACM		 1809 sk_node_init(&newsk->sk_node);
1810 sock_lock_init(newsk);
1811 bh_lock_sock(newsk);
fa438ccf 1812 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1813 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1814
1815 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1816 /*
1817 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1818 */
14afee4b 1819 refcount_set(&newsk->sk_wmem_alloc, 1);
87d11ceb 1820 atomic_set(&newsk->sk_omem_alloc, 0);
581319c5 1821 sk_init_common(newsk);
87d11ceb
ACM		 1822
1823 newsk->sk_dst_cache = NULL;
9b8805a3 1824 newsk->sk_dst_pending_confirm = 0;
87d11ceb
ACM		 1825 newsk->sk_wmem_queued = 0;
1826 newsk->sk_forward_alloc = 0;
9caad864 1827 atomic_set(&newsk->sk_drops, 0);
87d11ceb 1828 newsk->sk_send_head = NULL;
87d11ceb 1829 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
52267790 1830 atomic_set(&newsk->sk_zckey, 0);
87d11ceb
ACM		 1831
1832 sock_reset_flag(newsk, SOCK_DONE);
edbe69ef 1833 mem_cgroup_sk_alloc(newsk);
c0576e39 1834 cgroup_sk_alloc(&newsk->sk_cgrp_data);
87d11ceb 1835
eefca20e
ED		 1836 rcu_read_lock();
1837 filter = rcu_dereference(sk->sk_filter);
87d11ceb 1838 if (filter != NULL)
278571ba
AS		 1839 /* though it's an empty new sock, the charging may fail
1840 * if sysctl_optmem_max was changed between creation of
1841 * original socket and cloning
1842 */
1843 is_charged = sk_filter_charge(newsk, filter);
eefca20e
ED		 1844 RCU_INIT_POINTER(newsk->sk_filter, filter);
1845 rcu_read_unlock();
87d11ceb 1846
d188ba86 1847 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
a97e50cc
DB		 1848 /* We need to make sure that we don't uncharge the new
1849 * socket if we couldn't charge it in the first place
1850 * as otherwise we uncharge the parent's filter.
1851 */
1852 if (!is_charged)
1853 RCU_INIT_POINTER(newsk->sk_filter, NULL);
94352d45 1854 sk_free_unlock_clone(newsk);
87d11ceb
ACM		 1855 newsk = NULL;
1856 goto out;
1857 }
fa463497 1858 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
87d11ceb
ACM		 1859
1860 newsk->sk_err = 0;
e551c32d 1861 newsk->sk_err_soft = 0;
87d11ceb 1862 newsk->sk_priority = 0;
2c8c56e1 1863 newsk->sk_incoming_cpu = raw_smp_processor_id();
648845ab
TZ		 1864 if (likely(newsk->sk_net_refcnt))
1865 sock_inuse_add(sock_net(newsk), 1);
d979a39d 1866
4dc6dc71
ED		 1867 /*
1868 * Before updating sk_refcnt, we must commit prior changes to memory
1869 * (Documentation/RCU/rculist_nulls.txt for details)
1870 */
1871 smp_wmb();
41c6d650 1872 refcount_set(&newsk->sk_refcnt, 2);
87d11ceb
ACM		 1873
1874 /*
1875 * Increment the counter in the same struct proto as the master
1876 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1877 * is the same as sk->sk_prot->socks, as this field was copied
1878 * with memcpy).
1879 *
1880 * This _changes_ the previous behaviour, where
1881 * tcp_create_openreq_child always was incrementing the
1882 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1883 * to be taken into account in all callers. -acme
1884 */
1885 sk_refcnt_debug_inc(newsk);
972692e0 1886 sk_set_socket(newsk, NULL);
c2f26e8f 1887 RCU_INIT_POINTER(newsk->sk_wq, NULL);
87d11ceb
ACM		 1888
1889 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1890 sk_sockets_allocated_inc(newsk);
704da560 1891
080a270f
HFS		 1892 if (sock_needs_netstamp(sk) &&
1893 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1894 net_enable_timestamp();
87d11ceb
ACM		 1895 }
1896out:
1897 return newsk;
1898}
e56c57d0 1899EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1900
94352d45
ACM		 1901void sk_free_unlock_clone(struct sock *sk)
1902{
1903 /* It is still raw copy of parent, so invalidate
1904 * destructor and make plain sk_free() */
1905 sk->sk_destruct = NULL;
1906 bh_unlock_sock(sk);
1907 sk_free(sk);
1908}
1909EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
1910
9958089a
AK		 1911void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1912{
d6a4e26a
ED		 1913 u32 max_segs = 1;
1914
6bd4f355 1915 sk_dst_set(sk, dst);
0a6b2a1d 1916 sk->sk_route_caps = dst->dev->features | sk->sk_route_forced_caps;
9958089a 1917 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1918 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1919 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1920 if (sk_can_gso(sk)) {
f70f250a 1921 if (dst->header_len && !xfrm_dst_offload_ok(dst)) {
9958089a 1922 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1923 } else {
9958089a 1924 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1925 sk->sk_gso_max_size = dst->dev->gso_max_size;
d6a4e26a 1926 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
82cc1a7a 1927 }
9958089a 1928 }
d6a4e26a 1929 sk->sk_gso_max_segs = max_segs;
9958089a
AK		 1930}
1931EXPORT_SYMBOL_GPL(sk_setup_caps);
1932
1da177e4
LT		 1933/*
1934 * Simple resource managers for sockets.
1935 */
1936
1937
4ec93edb
YH		 1938/*
1939 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1940 */
1941void sock_wfree(struct sk_buff *skb)
1942{
1943 struct sock *sk = skb->sk;
d99927f4 1944 unsigned int len = skb->truesize;
1da177e4 1945
d99927f4
ED		 1946 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1947 /*
1948 * Keep a reference on sk_wmem_alloc, this will be released
1949 * after sk_write_space() call
1950 */
14afee4b 1951 WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc));
1da177e4 1952 sk->sk_write_space(sk);
d99927f4
ED		 1953 len = 1;
1954 }
2b85a34e 1955 /*
d99927f4
ED		 1956 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1957 * could not do because of in-flight packets
2b85a34e 1958 */
14afee4b 1959 if (refcount_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1960 __sk_free(sk);
1da177e4 1961}
2a91525c 1962EXPORT_SYMBOL(sock_wfree);
1da177e4 1963
1d2077ac
ED		 1964/* This variant of sock_wfree() is used by TCP,
1965 * since it sets SOCK_USE_WRITE_QUEUE.
1966 */
1967void __sock_wfree(struct sk_buff *skb)
1968{
1969 struct sock *sk = skb->sk;
1970
14afee4b 1971 if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
1d2077ac
ED		 1972 __sk_free(sk);
1973}
1974
9e17f8a4
ED		 1975void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1976{
1977 skb_orphan(skb);
1978 skb->sk = sk;
1979#ifdef CONFIG_INET
1980 if (unlikely(!sk_fullsock(sk))) {
1981 skb->destructor = sock_edemux;
1982 sock_hold(sk);
1983 return;
1984 }
1985#endif
1986 skb->destructor = sock_wfree;
1987 skb_set_hash_from_sk(skb, sk);
1988 /*
1989 * We used to take a refcount on sk, but following operation
1990 * is enough to guarantee sk_free() wont free this sock until
1991 * all in-flight packets are completed
1992 */
14afee4b 1993 refcount_add(skb->truesize, &sk->sk_wmem_alloc);
9e17f8a4
ED		 1994}
1995EXPORT_SYMBOL(skb_set_owner_w);
1996
1d2077ac
ED		 1997/* This helper is used by netem, as it can hold packets in its
1998 * delay queue. We want to allow the owner socket to send more
1999 * packets, as if they were already TX completed by a typical driver.
2000 * But we also want to keep skb->sk set because some packet schedulers
f6ba8d33 2001 * rely on it (sch_fq for example).
1d2077ac 2002 */
f2f872f9
ED		 2003void skb_orphan_partial(struct sk_buff *skb)
2004{
f6ba8d33 2005 if (skb_is_tcp_pure_ack(skb))
1d2077ac
ED		 2006 return;
2007
f2f872f9
ED		 2008 if (skb->destructor == sock_wfree
2009#ifdef CONFIG_INET
2010 || skb->destructor == tcp_wfree
2011#endif
2012 ) {
f6ba8d33
ED		 2013 struct sock *sk = skb->sk;
2014
41c6d650 2015 if (refcount_inc_not_zero(&sk->sk_refcnt)) {
14afee4b 2016 WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc));
f6ba8d33
ED		 2017 skb->destructor = sock_efree;
2018 }
f2f872f9
ED		 2019 } else {
2020 skb_orphan(skb);
2021 }
2022}
2023EXPORT_SYMBOL(skb_orphan_partial);
2024
4ec93edb
YH		 2025/*
2026 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 2027 */
2028void sock_rfree(struct sk_buff *skb)
2029{
2030 struct sock *sk = skb->sk;
d361fd59 2031 unsigned int len = skb->truesize;
1da177e4 2032
d361fd59
ED		 2033 atomic_sub(len, &sk->sk_rmem_alloc);
2034 sk_mem_uncharge(sk, len);
1da177e4 2035}
2a91525c 2036EXPORT_SYMBOL(sock_rfree);
1da177e4 2037
7768eed8
OH		 2038/*
2039 * Buffer destructor for skbs that are not used directly in read or write
2040 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
2041 */
62bccb8c
AD		 2042void sock_efree(struct sk_buff *skb)
2043{
2044 sock_put(skb->sk);
2045}
2046EXPORT_SYMBOL(sock_efree);
2047
976d0201 2048kuid_t sock_i_uid(struct sock *sk)
1da177e4 2049{
976d0201 2050 kuid_t uid;
1da177e4 2051
f064af1e 2052 read_lock_bh(&sk->sk_callback_lock);
976d0201 2053 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 2054 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 2055 return uid;
2056}
2a91525c 2057EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 2058
2059unsigned long sock_i_ino(struct sock *sk)
2060{
2061 unsigned long ino;
2062
f064af1e 2063 read_lock_bh(&sk->sk_callback_lock);
1da177e4 2064 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 2065 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 2066 return ino;
2067}
2a91525c 2068EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 2069
2070/*
2071 * Allocate a skb from the socket's send buffer.
2072 */
86a76caf 2073struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 2074 gfp_t priority)
1da177e4 2075{
14afee4b 2076 if (force || refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 2077 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 2078 if (skb) {
2079 skb_set_owner_w(skb, sk);
2080 return skb;
2081 }
2082 }
2083 return NULL;
2084}
2a91525c 2085EXPORT_SYMBOL(sock_wmalloc);
1da177e4 2086
98ba0bd5
WB		 2087static void sock_ofree(struct sk_buff *skb)
2088{
2089 struct sock *sk = skb->sk;
2090
2091 atomic_sub(skb->truesize, &sk->sk_omem_alloc);
2092}
2093
2094struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size,
2095 gfp_t priority)
2096{
2097 struct sk_buff *skb;
2098
2099 /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */
2100 if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) >
2101 sysctl_optmem_max)
2102 return NULL;
2103
2104 skb = alloc_skb(size, priority);
2105 if (!skb)
2106 return NULL;
2107
2108 atomic_add(skb->truesize, &sk->sk_omem_alloc);
2109 skb->sk = sk;
2110 skb->destructor = sock_ofree;
2111 return skb;
2112}
2113
4ec93edb 2114/*
1da177e4 2115 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 2116 */
dd0fc66f 2117void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 2118{
95c96174 2119 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 2120 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
2121 void *mem;
2122 /* First do the add, to avoid the race if kmalloc
4ec93edb 2123 * might sleep.
1da177e4
LT		 2124 */
2125 atomic_add(size, &sk->sk_omem_alloc);
2126 mem = kmalloc(size, priority);
2127 if (mem)
2128 return mem;
2129 atomic_sub(size, &sk->sk_omem_alloc);
2130 }
2131 return NULL;
2132}
2a91525c 2133EXPORT_SYMBOL(sock_kmalloc);
1da177e4 2134
79e88659
DB		 2135/* Free an option memory block. Note, we actually want the inline
2136 * here as this allows gcc to detect the nullify and fold away the
2137 * condition entirely.
1da177e4 2138 */
79e88659
DB		 2139static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
2140 const bool nullify)
1da177e4 2141{
e53da5fb
DM		 2142 if (WARN_ON_ONCE(!mem))
2143 return;
79e88659
DB		 2144 if (nullify)
2145 kzfree(mem);
2146 else
2147 kfree(mem);
1da177e4
LT		 2148 atomic_sub(size, &sk->sk_omem_alloc);
2149}
79e88659
DB		 2150
2151void sock_kfree_s(struct sock *sk, void *mem, int size)
2152{
2153 __sock_kfree_s(sk, mem, size, false);
2154}
2a91525c 2155EXPORT_SYMBOL(sock_kfree_s);
1da177e4 2156
79e88659
DB		 2157void sock_kzfree_s(struct sock *sk, void *mem, int size)
2158{
2159 __sock_kfree_s(sk, mem, size, true);
2160}
2161EXPORT_SYMBOL(sock_kzfree_s);
2162
1da177e4
LT		 2163/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
2164 I think, these locks should be removed for datagram sockets.
2165 */
2a91525c 2166static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 2167{
2168 DEFINE_WAIT(wait);
2169
9cd3e072 2170 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1da177e4
LT		 2171 for (;;) {
2172 if (!timeo)
2173 break;
2174 if (signal_pending(current))
2175 break;
2176 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 2177 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
14afee4b 2178 if (refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1da177e4
LT		 2179 break;
2180 if (sk->sk_shutdown & SEND_SHUTDOWN)
2181 break;
2182 if (sk->sk_err)
2183 break;
2184 timeo = schedule_timeout(timeo);
2185 }
aa395145 2186 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 2187 return timeo;
2188}
2189
2190
2191/*
2192 * Generic send/receive buffer handlers
2193 */
2194
4cc7f68d
HX		 2195struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
2196 unsigned long data_len, int noblock,
28d64271 2197 int *errcode, int max_page_order)
1da177e4 2198{
2e4e4410 2199 struct sk_buff *skb;
1da177e4
LT		 2200 long timeo;
2201 int err;
2202
1da177e4 2203 timeo = sock_sndtimeo(sk, noblock);
2e4e4410 2204 for (;;) {
1da177e4
LT		 2205 err = sock_error(sk);
2206 if (err != 0)
2207 goto failure;
2208
2209 err = -EPIPE;
2210 if (sk->sk_shutdown & SEND_SHUTDOWN)
2211 goto failure;
2212
2e4e4410
ED		 2213 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
2214 break;
28d64271 2215
9cd3e072 2216 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2e4e4410
ED		 2217 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2218 err = -EAGAIN;
2219 if (!timeo)
1da177e4 2220 goto failure;
2e4e4410
ED		 2221 if (signal_pending(current))
2222 goto interrupted;
2223 timeo = sock_wait_for_wmem(sk, timeo);
1da177e4 2224 }
2e4e4410
ED		 2225 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
2226 errcode, sk->sk_allocation);
2227 if (skb)
2228 skb_set_owner_w(skb, sk);
1da177e4
LT		 2229 return skb;
2230
2231interrupted:
2232 err = sock_intr_errno(timeo);
2233failure:
2234 *errcode = err;
2235 return NULL;
2236}
4cc7f68d 2237EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 2238
4ec93edb 2239struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 2240 int noblock, int *errcode)
2241{
28d64271 2242 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 2243}
2a91525c 2244EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 2245
39771b12
WB		 2246int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
2247 struct sockcm_cookie *sockc)
2248{
3dd17e63
SHY		 2249 u32 tsflags;
2250
39771b12
WB		 2251 switch (cmsg->cmsg_type) {
2252 case SO_MARK:
2253 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2254 return -EPERM;
2255 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2256 return -EINVAL;
2257 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
2258 break;
7f1bc6e9 2259 case SO_TIMESTAMPING_OLD:
3dd17e63
SHY		 2260 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2261 return -EINVAL;
2262
2263 tsflags = *(u32 *)CMSG_DATA(cmsg);
2264 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
2265 return -EINVAL;
2266
2267 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
2268 sockc->tsflags |= tsflags;
2269 break;
80b14dee
RC		 2270 case SCM_TXTIME:
2271 if (!sock_flag(sk, SOCK_TXTIME))
2272 return -EINVAL;
2273 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u64)))
2274 return -EINVAL;
2275 sockc->transmit_time = get_unaligned((u64 *)CMSG_DATA(cmsg));
2276 break;
779f1ede
SHY		 2277 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
2278 case SCM_RIGHTS:
2279 case SCM_CREDENTIALS:
2280 break;
39771b12
WB		 2281 default:
2282 return -EINVAL;
2283 }
2284 return 0;
2285}
2286EXPORT_SYMBOL(__sock_cmsg_send);
2287
f28ea365
EJ		 2288int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
2289 struct sockcm_cookie *sockc)
2290{
2291 struct cmsghdr *cmsg;
39771b12 2292 int ret;
f28ea365
EJ		 2293
2294 for_each_cmsghdr(cmsg, msg) {
2295 if (!CMSG_OK(msg, cmsg))
2296 return -EINVAL;
2297 if (cmsg->cmsg_level != SOL_SOCKET)
2298 continue;
39771b12
WB		 2299 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
2300 if (ret)
2301 return ret;
f28ea365
EJ		 2302 }
2303 return 0;
2304}
2305EXPORT_SYMBOL(sock_cmsg_send);
2306
06044751
ED		 2307static void sk_enter_memory_pressure(struct sock *sk)
2308{
2309 if (!sk->sk_prot->enter_memory_pressure)
2310 return;
2311
2312 sk->sk_prot->enter_memory_pressure(sk);
2313}
2314
2315static void sk_leave_memory_pressure(struct sock *sk)
2316{
2317 if (sk->sk_prot->leave_memory_pressure) {
2318 sk->sk_prot->leave_memory_pressure(sk);
2319 } else {
2320 unsigned long *memory_pressure = sk->sk_prot->memory_pressure;
2321
2322 if (memory_pressure && *memory_pressure)
2323 *memory_pressure = 0;
2324 }
2325}
2326
5640f768
ED		 2327/* On 32bit arches, an skb frag is limited to 2^15 */
2328#define SKB_FRAG_PAGE_ORDER get_order(32768)
2329
400dfd3a
ED		 2330/**
2331 * skb_page_frag_refill - check that a page_frag contains enough room
2332 * @sz: minimum size of the fragment we want to get
2333 * @pfrag: pointer to page_frag
82d5e2b8 2334 * @gfp: priority for memory allocation
400dfd3a
ED		 2335 *
2336 * Note: While this allocator tries to use high order pages, there is
2337 * no guarantee that allocations succeed. Therefore, @sz MUST be
2338 * less or equal than PAGE_SIZE.
2339 */
d9b2938a 2340bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 2341{
5640f768 2342 if (pfrag->page) {
fe896d18 2343 if (page_ref_count(pfrag->page) == 1) {
5640f768
ED		 2344 pfrag->offset = 0;
2345 return true;
2346 }
400dfd3a 2347 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 2348 return true;
2349 put_page(pfrag->page);
2350 }
2351
d9b2938a
ED		 2352 pfrag->offset = 0;
2353 if (SKB_FRAG_PAGE_ORDER) {
d0164adc
MG		 2354 /* Avoid direct reclaim but allow kswapd to wake */
2355 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
2356 __GFP_COMP | __GFP_NOWARN |
2357 __GFP_NORETRY,
d9b2938a 2358 SKB_FRAG_PAGE_ORDER);
5640f768 2359 if (likely(pfrag->page)) {
d9b2938a 2360 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 2361 return true;
2362 }
d9b2938a
ED		 2363 }
2364 pfrag->page = alloc_page(gfp);
2365 if (likely(pfrag->page)) {
2366 pfrag->size = PAGE_SIZE;
2367 return true;
2368 }
400dfd3a
ED		 2369 return false;
2370}
2371EXPORT_SYMBOL(skb_page_frag_refill);
2372
2373bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2374{
2375 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2376 return true;
2377
5640f768
ED		 2378 sk_enter_memory_pressure(sk);
2379 sk_stream_moderate_sndbuf(sk);
2380 return false;
2381}
2382EXPORT_SYMBOL(sk_page_frag_refill);
2383
1da177e4 2384static void __lock_sock(struct sock *sk)
f39234d6
NK		 2385 __releases(&sk->sk_lock.slock)
2386 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 2387{
2388 DEFINE_WAIT(wait);
2389
e71a4783 2390 for (;;) {
1da177e4
LT		 2391 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2392 TASK_UNINTERRUPTIBLE);
2393 spin_unlock_bh(&sk->sk_lock.slock);
2394 schedule();
2395 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 2396 if (!sock_owned_by_user(sk))
1da177e4
LT		 2397 break;
2398 }
2399 finish_wait(&sk->sk_lock.wq, &wait);
2400}
2401
8873c064 2402void __release_sock(struct sock *sk)
f39234d6
NK		 2403 __releases(&sk->sk_lock.slock)
2404 __acquires(&sk->sk_lock.slock)
1da177e4 2405{
5413d1ba 2406 struct sk_buff *skb, *next;
1da177e4 2407
5413d1ba 2408 while ((skb = sk->sk_backlog.head) != NULL) {
1da177e4 2409 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1da177e4 2410
5413d1ba 2411 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4 2412
5413d1ba
ED		 2413 do {
2414 next = skb->next;
e4cbb02a 2415 prefetch(next);
7fee226a 2416 WARN_ON_ONCE(skb_dst_is_noref(skb));
a8305bff 2417 skb_mark_not_on_list(skb);
c57943a1 2418 sk_backlog_rcv(sk, skb);
1da177e4 2419
5413d1ba 2420 cond_resched();
1da177e4
LT		 2421
2422 skb = next;
2423 } while (skb != NULL);
2424
5413d1ba
ED		 2425 spin_lock_bh(&sk->sk_lock.slock);
2426 }
8eae939f
ZY		 2427
2428 /*
2429 * Doing the zeroing here guarantee we can not loop forever
2430 * while a wild producer attempts to flood us.
2431 */
2432 sk->sk_backlog.len = 0;
1da177e4
LT		 2433}
2434
d41a69f1
ED		 2435void __sk_flush_backlog(struct sock *sk)
2436{
2437 spin_lock_bh(&sk->sk_lock.slock);
2438 __release_sock(sk);
2439 spin_unlock_bh(&sk->sk_lock.slock);
2440}
2441
1da177e4
LT		 2442/**
2443 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 2444 * @sk: sock to wait on
2445 * @timeo: for how long
dfbafc99 2446 * @skb: last skb seen on sk_receive_queue
1da177e4
LT		 2447 *
2448 * Now socket state including sk->sk_err is changed only under lock,
2449 * hence we may omit checks after joining wait queue.
2450 * We check receive queue before schedule() only as optimization;
2451 * it is very likely that release_sock() added new data.
2452 */
dfbafc99 2453int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
1da177e4 2454{
d9dc8b0f 2455 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1da177e4 2456 int rc;
1da177e4 2457
d9dc8b0f 2458 add_wait_queue(sk_sleep(sk), &wait);
9cd3e072 2459 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
d9dc8b0f 2460 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
9cd3e072 2461 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
d9dc8b0f 2462 remove_wait_queue(sk_sleep(sk), &wait);
1da177e4
LT		 2463 return rc;
2464}
1da177e4
LT		 2465EXPORT_SYMBOL(sk_wait_data);
2466
3ab224be 2467/**
f8c3bf00 2468 * __sk_mem_raise_allocated - increase memory_allocated
3ab224be
HA		 2469 * @sk: socket
2470 * @size: memory size to allocate
f8c3bf00 2471 * @amt: pages to allocate
3ab224be
HA		 2472 * @kind: allocation type
2473 *
f8c3bf00 2474 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc
3ab224be 2475 */
f8c3bf00 2476int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
3ab224be
HA		 2477{
2478 struct proto *prot = sk->sk_prot;
f8c3bf00 2479 long allocated = sk_memory_allocated_add(sk, amt);
d6f19938 2480 bool charged = true;
e805605c 2481
baac50bb 2482 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
d6f19938 2483 !(charged = mem_cgroup_charge_skmem(sk->sk_memcg, amt)))
e805605c 2484 goto suppress_allocation;
3ab224be
HA		 2485
2486 /* Under limit. */
e805605c 2487 if (allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2488 sk_leave_memory_pressure(sk);
3ab224be
HA		 2489 return 1;
2490 }
2491
e805605c
JW		 2492 /* Under pressure. */
2493 if (allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2494 sk_enter_memory_pressure(sk);
3ab224be 2495
e805605c
JW		 2496 /* Over hard limit. */
2497 if (allocated > sk_prot_mem_limits(sk, 2))
3ab224be
HA		 2498 goto suppress_allocation;
2499
2500 /* guarantee minimum buffer size under pressure */
2501 if (kind == SK_MEM_RECV) {
a3dcaf17 2502 if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot))
3ab224be 2503 return 1;
180d8cd9 2504
3ab224be 2505 } else { /* SK_MEM_SEND */
a3dcaf17
ED		 2506 int wmem0 = sk_get_wmem0(sk, prot);
2507
3ab224be 2508 if (sk->sk_type == SOCK_STREAM) {
a3dcaf17 2509 if (sk->sk_wmem_queued < wmem0)
3ab224be 2510 return 1;
a3dcaf17 2511 } else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) {
3ab224be 2512 return 1;
a3dcaf17 2513 }
3ab224be
HA		 2514 }
2515
180d8cd9 2516 if (sk_has_memory_pressure(sk)) {
5bf325a5 2517 u64 alloc;
1748376b 2518
180d8cd9 2519 if (!sk_under_memory_pressure(sk))
1748376b 2520 return 1;
180d8cd9
GC		 2521 alloc = sk_sockets_allocated_read_positive(sk);
2522 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2523 sk_mem_pages(sk->sk_wmem_queued +
2524 atomic_read(&sk->sk_rmem_alloc) +
2525 sk->sk_forward_alloc))
2526 return 1;
2527 }
2528
2529suppress_allocation:
2530
2531 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2532 sk_stream_moderate_sndbuf(sk);
2533
2534 /* Fail only if socket is _under_ its sndbuf.
2535 * In this case we cannot block, so that we have to fail.
2536 */
2537 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2538 return 1;
2539 }
2540
d6f19938
YS		 2541 if (kind == SK_MEM_SEND || (kind == SK_MEM_RECV && charged))
2542 trace_sock_exceed_buf_limit(sk, prot, allocated, kind);
3847ce32 2543
0e90b31f 2544 sk_memory_allocated_sub(sk, amt);
180d8cd9 2545
baac50bb
JW		 2546 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2547 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
e805605c 2548
3ab224be
HA		 2549 return 0;
2550}
f8c3bf00
PA		 2551EXPORT_SYMBOL(__sk_mem_raise_allocated);
2552
2553/**
2554 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2555 * @sk: socket
2556 * @size: memory size to allocate
2557 * @kind: allocation type
2558 *
2559 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2560 * rmem allocation. This function assumes that protocols which have
2561 * memory_pressure use sk_wmem_queued as write buffer accounting.
2562 */
2563int __sk_mem_schedule(struct sock *sk, int size, int kind)
2564{
2565 int ret, amt = sk_mem_pages(size);
2566
2567 sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT;
2568 ret = __sk_mem_raise_allocated(sk, size, amt, kind);
2569 if (!ret)
2570 sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT;
2571 return ret;
2572}
3ab224be
HA		 2573EXPORT_SYMBOL(__sk_mem_schedule);
2574
2575/**
f8c3bf00 2576 * __sk_mem_reduce_allocated - reclaim memory_allocated
3ab224be 2577 * @sk: socket
f8c3bf00
PA		 2578 * @amount: number of quanta
2579 *
2580 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
3ab224be 2581 */
f8c3bf00 2582void __sk_mem_reduce_allocated(struct sock *sk, int amount)
3ab224be 2583{
1a24e04e 2584 sk_memory_allocated_sub(sk, amount);
3ab224be 2585
baac50bb
JW		 2586 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2587 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
e805605c 2588
180d8cd9
GC		 2589 if (sk_under_memory_pressure(sk) &&
2590 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2591 sk_leave_memory_pressure(sk);
3ab224be 2592}
f8c3bf00
PA		 2593EXPORT_SYMBOL(__sk_mem_reduce_allocated);
2594
2595/**
2596 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
2597 * @sk: socket
2598 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
2599 */
2600void __sk_mem_reclaim(struct sock *sk, int amount)
2601{
2602 amount >>= SK_MEM_QUANTUM_SHIFT;
2603 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
2604 __sk_mem_reduce_allocated(sk, amount);
2605}
3ab224be
HA		 2606EXPORT_SYMBOL(__sk_mem_reclaim);
2607
627d2d6b 2608int sk_set_peek_off(struct sock *sk, int val)
2609{
627d2d6b 2610 sk->sk_peek_off = val;
2611 return 0;
2612}
2613EXPORT_SYMBOL_GPL(sk_set_peek_off);
3ab224be 2614
1da177e4
LT		 2615/*
2616 * Set of default routines for initialising struct proto_ops when
2617 * the protocol does not support a particular function. In certain
2618 * cases where it makes no sense for a protocol to have a "do nothing"
2619 * function, some default processing is provided.
2620 */
2621
2622int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2623{
2624 return -EOPNOTSUPP;
2625}
2a91525c 2626EXPORT_SYMBOL(sock_no_bind);
1da177e4 2627
4ec93edb 2628int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2629 int len, int flags)
2630{
2631 return -EOPNOTSUPP;
2632}
2a91525c 2633EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2634
2635int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2636{
2637 return -EOPNOTSUPP;
2638}
2a91525c 2639EXPORT_SYMBOL(sock_no_socketpair);
1da177e4 2640
cdfbabfb
DH		 2641int sock_no_accept(struct socket *sock, struct socket *newsock, int flags,
2642 bool kern)
1da177e4
LT		 2643{
2644 return -EOPNOTSUPP;
2645}
2a91525c 2646EXPORT_SYMBOL(sock_no_accept);
1da177e4 2647
4ec93edb 2648int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
9b2c45d4 2649 int peer)
1da177e4
LT		 2650{
2651 return -EOPNOTSUPP;
2652}
2a91525c 2653EXPORT_SYMBOL(sock_no_getname);
1da177e4 2654
1da177e4
LT		 2655int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2656{
2657 return -EOPNOTSUPP;
2658}
2a91525c 2659EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2660
2661int sock_no_listen(struct socket *sock, int backlog)
2662{
2663 return -EOPNOTSUPP;
2664}
2a91525c 2665EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2666
2667int sock_no_shutdown(struct socket *sock, int how)
2668{
2669 return -EOPNOTSUPP;
2670}
2a91525c 2671EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2672
2673int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2674 char __user *optval, unsigned int optlen)
1da177e4
LT		 2675{
2676 return -EOPNOTSUPP;
2677}
2a91525c 2678EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2679
2680int sock_no_getsockopt(struct socket *sock, int level, int optname,
2681 char __user *optval, int __user *optlen)
2682{
2683 return -EOPNOTSUPP;
2684}
2a91525c 2685EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4 2686
1b784140 2687int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
1da177e4
LT		 2688{
2689 return -EOPNOTSUPP;
2690}
2a91525c 2691EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4 2692
306b13eb
TH		 2693int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len)
2694{
2695 return -EOPNOTSUPP;
2696}
2697EXPORT_SYMBOL(sock_no_sendmsg_locked);
2698
1b784140
YX		 2699int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2700 int flags)
1da177e4
LT		 2701{
2702 return -EOPNOTSUPP;
2703}
2a91525c 2704EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2705
2706int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2707{
2708 /* Mirror missing mmap method error code */
2709 return -ENODEV;
2710}
2a91525c 2711EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2712
2713ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2714{
2715 ssize_t res;
2716 struct msghdr msg = {.msg_flags = flags};
2717 struct kvec iov;
2718 char *kaddr = kmap(page);
2719 iov.iov_base = kaddr + offset;
2720 iov.iov_len = size;
2721 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2722 kunmap(page);
2723 return res;
2724}
2a91525c 2725EXPORT_SYMBOL(sock_no_sendpage);
1da177e4 2726
306b13eb
TH		 2727ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page,
2728 int offset, size_t size, int flags)
2729{
2730 ssize_t res;
2731 struct msghdr msg = {.msg_flags = flags};
2732 struct kvec iov;
2733 char *kaddr = kmap(page);
2734
2735 iov.iov_base = kaddr + offset;
2736 iov.iov_len = size;
2737 res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size);
2738 kunmap(page);
2739 return res;
2740}
2741EXPORT_SYMBOL(sock_no_sendpage_locked);
2742
1da177e4
LT		 2743/*
2744 * Default Socket Callbacks
2745 */
2746
2747static void sock_def_wakeup(struct sock *sk)
2748{
43815482
ED		 2749 struct socket_wq *wq;
2750
2751 rcu_read_lock();
2752 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2753 if (skwq_has_sleeper(wq))
43815482
ED		 2754 wake_up_interruptible_all(&wq->wait);
2755 rcu_read_unlock();
1da177e4
LT		 2756}
2757
2758static void sock_def_error_report(struct sock *sk)
2759{
43815482
ED		 2760 struct socket_wq *wq;
2761
2762 rcu_read_lock();
2763 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2764 if (skwq_has_sleeper(wq))
a9a08845 2765 wake_up_interruptible_poll(&wq->wait, EPOLLERR);
8d8ad9d7 2766 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2767 rcu_read_unlock();
1da177e4
LT		 2768}
2769
676d2369 2770static void sock_def_readable(struct sock *sk)
1da177e4 2771{
43815482
ED		 2772 struct socket_wq *wq;
2773
2774 rcu_read_lock();
2775 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2776 if (skwq_has_sleeper(wq))
a9a08845
LT		 2777 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
2778 EPOLLRDNORM | EPOLLRDBAND);
8d8ad9d7 2779 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2780 rcu_read_unlock();
1da177e4
LT		 2781}
2782
2783static void sock_def_write_space(struct sock *sk)
2784{
43815482
ED		 2785 struct socket_wq *wq;
2786
2787 rcu_read_lock();
1da177e4
LT		 2788
2789 /* Do not wake up a writer until he can make "significant"
2790 * progress. --DaveM
2791 */
14afee4b 2792 if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482 2793 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2794 if (skwq_has_sleeper(wq))
a9a08845
LT		 2795 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2796 EPOLLWRNORM | EPOLLWRBAND);
1da177e4
LT		 2797
2798 /* Should agree with poll, otherwise some programs break */
2799 if (sock_writeable(sk))
8d8ad9d7 2800 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2801 }
2802
43815482 2803 rcu_read_unlock();
1da177e4
LT		 2804}
2805
2806static void sock_def_destruct(struct sock *sk)
2807{
1da177e4
LT		 2808}
2809
2810void sk_send_sigurg(struct sock *sk)
2811{
2812 if (sk->sk_socket && sk->sk_socket->file)
2813 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2814 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2815}
2a91525c 2816EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2817
2818void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2819 unsigned long expires)
2820{
2821 if (!mod_timer(timer, expires))
2822 sock_hold(sk);
2823}
1da177e4
LT		 2824EXPORT_SYMBOL(sk_reset_timer);
2825
2826void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2827{
25cc4ae9 2828 if (del_timer(timer))
1da177e4
LT		 2829 __sock_put(sk);
2830}
1da177e4
LT		 2831EXPORT_SYMBOL(sk_stop_timer);
2832
2833void sock_init_data(struct socket *sock, struct sock *sk)
2834{
581319c5 2835 sk_init_common(sk);
1da177e4
LT		 2836 sk->sk_send_head = NULL;
2837
99767f27 2838 timer_setup(&sk->sk_timer, NULL, 0);
4ec93edb 2839
1da177e4
LT		 2840 sk->sk_allocation = GFP_KERNEL;
2841 sk->sk_rcvbuf = sysctl_rmem_default;
2842 sk->sk_sndbuf = sysctl_wmem_default;
2843 sk->sk_state = TCP_CLOSE;
972692e0 2844 sk_set_socket(sk, sock);
1da177e4
LT		 2845
2846 sock_set_flag(sk, SOCK_ZAPPED);
2847
e71a4783 2848 if (sock) {
1da177e4 2849 sk->sk_type = sock->type;
c2f26e8f 2850 RCU_INIT_POINTER(sk->sk_wq, sock->wq);
1da177e4 2851 sock->sk = sk;
86741ec2
LC		 2852 sk->sk_uid = SOCK_INODE(sock)->i_uid;
2853 } else {
c2f26e8f 2854 RCU_INIT_POINTER(sk->sk_wq, NULL);
86741ec2
LC		 2855 sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0);
2856 }
1da177e4 2857
1da177e4 2858 rwlock_init(&sk->sk_callback_lock);
cdfbabfb
DH		 2859 if (sk->sk_kern_sock)
2860 lockdep_set_class_and_name(
2861 &sk->sk_callback_lock,
2862 af_kern_callback_keys + sk->sk_family,
2863 af_family_kern_clock_key_strings[sk->sk_family]);
2864 else
2865 lockdep_set_class_and_name(
2866 &sk->sk_callback_lock,
443aef0e
PZ		 2867 af_callback_keys + sk->sk_family,
2868 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2869
2870 sk->sk_state_change = sock_def_wakeup;
2871 sk->sk_data_ready = sock_def_readable;
2872 sk->sk_write_space = sock_def_write_space;
2873 sk->sk_error_report = sock_def_error_report;
2874 sk->sk_destruct = sock_def_destruct;
2875
5640f768
ED		 2876 sk->sk_frag.page = NULL;
2877 sk->sk_frag.offset = 0;
ef64a54f 2878 sk->sk_peek_off = -1;
1da177e4 2879
109f6e39
EB		 2880 sk->sk_peer_pid = NULL;
2881 sk->sk_peer_cred = NULL;
1da177e4
LT		 2882 sk->sk_write_pending = 0;
2883 sk->sk_rcvlowat = 1;
2884 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2885 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2886
6c7c98ba 2887 sk->sk_stamp = SK_DEFAULT_STAMP;
3a0ed3e9
DD		 2888#if BITS_PER_LONG==32
2889 seqlock_init(&sk->sk_stamp_seq);
2890#endif
52267790 2891 atomic_set(&sk->sk_zckey, 0);
1da177e4 2892
e0d1095a 2893#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2894 sk->sk_napi_id = 0;
64b0dc51 2895 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2896#endif
2897
76a9ebe8
ED		 2898 sk->sk_max_pacing_rate = ~0UL;
2899 sk->sk_pacing_rate = ~0UL;
3a9b76fd 2900 sk->sk_pacing_shift = 10;
70da268b 2901 sk->sk_incoming_cpu = -1;
c6345ce7
AN		 2902
2903 sk_rx_queue_clear(sk);
4dc6dc71
ED		 2904 /*
2905 * Before updating sk_refcnt, we must commit prior changes to memory
2906 * (Documentation/RCU/rculist_nulls.txt for details)
2907 */
2908 smp_wmb();
41c6d650 2909 refcount_set(&sk->sk_refcnt, 1);
33c732c3 2910 atomic_set(&sk->sk_drops, 0);
1da177e4 2911}
2a91525c 2912EXPORT_SYMBOL(sock_init_data);
1da177e4 2913
b5606c2d 2914void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2915{
2916 might_sleep();
a5b5bb9a 2917 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2918 if (sk->sk_lock.owned)
1da177e4 2919 __lock_sock(sk);
d2e9117c 2920 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2921 spin_unlock(&sk->sk_lock.slock);
2922 /*
2923 * The sk_lock has mutex_lock() semantics here:
2924 */
fcc70d5f 2925 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2926 local_bh_enable();
1da177e4 2927}
fcc70d5f 2928EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2929
b5606c2d 2930void release_sock(struct sock *sk)
1da177e4 2931{
a5b5bb9a 2932 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2933 if (sk->sk_backlog.tail)
2934 __release_sock(sk);
46d3ceab 2935
c3f9b018
ED		 2936 /* Warning : release_cb() might need to release sk ownership,
2937 * ie call sock_release_ownership(sk) before us.
2938 */
46d3ceab
ED		 2939 if (sk->sk_prot->release_cb)
2940 sk->sk_prot->release_cb(sk);
2941
c3f9b018 2942 sock_release_ownership(sk);
a5b5bb9a
IM		 2943 if (waitqueue_active(&sk->sk_lock.wq))
2944 wake_up(&sk->sk_lock.wq);
2945 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2946}
2947EXPORT_SYMBOL(release_sock);
2948
8a74ad60
ED		 2949/**
2950 * lock_sock_fast - fast version of lock_sock
2951 * @sk: socket
2952 *
2953 * This version should be used for very small section, where process wont block
d651983d
MCC		 2954 * return false if fast path is taken:
2955 *
8a74ad60 2956 * sk_lock.slock locked, owned = 0, BH disabled
d651983d
MCC		 2957 *
2958 * return true if slow path is taken:
2959 *
8a74ad60
ED		 2960 * sk_lock.slock unlocked, owned = 1, BH enabled
2961 */
2962bool lock_sock_fast(struct sock *sk)
2963{
2964 might_sleep();
2965 spin_lock_bh(&sk->sk_lock.slock);
2966
2967 if (!sk->sk_lock.owned)
2968 /*
2969 * Note : We must disable BH
2970 */
2971 return false;
2972
2973 __lock_sock(sk);
2974 sk->sk_lock.owned = 1;
2975 spin_unlock(&sk->sk_lock.slock);
2976 /*
2977 * The sk_lock has mutex_lock() semantics here:
2978 */
2979 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2980 local_bh_enable();
2981 return true;
2982}
2983EXPORT_SYMBOL(lock_sock_fast);
2984
c7cbdbf2
AB		 2985int sock_gettstamp(struct socket *sock, void __user *userstamp,
2986 bool timeval, bool time32)
4ec93edb 2987{
c7cbdbf2
AB		 2988 struct sock *sk = sock->sk;
2989 struct timespec64 ts;
9dae3497
YS		 2990
2991 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
c7cbdbf2
AB		 2992 ts = ktime_to_timespec64(sock_read_timestamp(sk));
2993 if (ts.tv_sec == -1)
1da177e4 2994 return -ENOENT;
c7cbdbf2 2995 if (ts.tv_sec == 0) {
3a0ed3e9 2996 ktime_t kt = ktime_get_real();
c7cbdbf2
AB		 2997 sock_write_timestamp(sk, kt);;
2998 ts = ktime_to_timespec64(kt);
b7aa0bf7 2999 }
1da177e4 3000
c7cbdbf2
AB		 3001 if (timeval)
3002 ts.tv_nsec /= 1000;
9dae3497 3003
c7cbdbf2
AB		 3004#ifdef CONFIG_COMPAT_32BIT_TIME
3005 if (time32)
3006 return put_old_timespec32(&ts, userstamp);
3007#endif
3008#ifdef CONFIG_SPARC64
3009 /* beware of padding in sparc64 timeval */
3010 if (timeval && !in_compat_syscall()) {
3011 struct __kernel_old_timeval __user tv = {
c98f4822
SR		 3012 .tv_sec = ts.tv_sec,
3013 .tv_usec = ts.tv_nsec,
c7cbdbf2 3014 };
c98f4822 3015 if (copy_to_user(userstamp, &tv, sizeof(tv)))
c7cbdbf2
AB		 3016 return -EFAULT;
3017 return 0;
ae40eb1e 3018 }
c7cbdbf2
AB		 3019#endif
3020 return put_timespec64(&ts, userstamp);
ae40eb1e 3021}
c7cbdbf2 3022EXPORT_SYMBOL(sock_gettstamp);
ae40eb1e 3023
20d49473 3024void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 3025{
20d49473 3026 if (!sock_flag(sk, flag)) {
08e29af3
ED		 3027 unsigned long previous_flags = sk->sk_flags;
3028
20d49473
PO		 3029 sock_set_flag(sk, flag);
3030 /*
3031 * we just set one of the two flags which require net
3032 * time stamping, but time stamping might have been on
3033 * already because of the other one
3034 */
080a270f
HFS		 3035 if (sock_needs_netstamp(sk) &&
3036 !(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 3037 net_enable_timestamp();
1da177e4
LT		 3038 }
3039}
1da177e4 3040
cb820f8e
RC		 3041int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
3042 int level, int type)
3043{
3044 struct sock_exterr_skb *serr;
364a9e93 3045 struct sk_buff *skb;
cb820f8e
RC		 3046 int copied, err;
3047
3048 err = -EAGAIN;
364a9e93 3049 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 3050 if (skb == NULL)
3051 goto out;
3052
3053 copied = skb->len;
3054 if (copied > len) {
3055 msg->msg_flags |= MSG_TRUNC;
3056 copied = len;
3057 }
51f3d02b 3058 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 3059 if (err)
3060 goto out_free_skb;
3061
3062 sock_recv_timestamp(msg, sk, skb);
3063
3064 serr = SKB_EXT_ERR(skb);
3065 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
3066
3067 msg->msg_flags |= MSG_ERRQUEUE;
3068 err = copied;
3069
cb820f8e
RC		 3070out_free_skb:
3071 kfree_skb(skb);
3072out:
3073 return err;
3074}
3075EXPORT_SYMBOL(sock_recv_errqueue);
3076
1da177e4
LT		 3077/*
3078 * Get a socket option on an socket.
3079 *
3080 * FIX: POSIX 1003.1g is very ambiguous here. It states that
3081 * asynchronous errors should be reported by getsockopt. We assume
3082 * this means if you specify SO_ERROR (otherwise whats the point of it).
3083 */
3084int sock_common_getsockopt(struct socket *sock, int level, int optname,
3085 char __user *optval, int __user *optlen)
3086{
3087 struct sock *sk = sock->sk;
3088
3089 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
3090}
1da177e4
LT		 3091EXPORT_SYMBOL(sock_common_getsockopt);
3092
3fdadf7d 3093#ifdef CONFIG_COMPAT
543d9cfe
ACM		 3094int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
3095 char __user *optval, int __user *optlen)
3fdadf7d
DM		 3096{
3097 struct sock *sk = sock->sk;
3098
1e51f951 3099 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 3100 return sk->sk_prot->compat_getsockopt(sk, level, optname,
3101 optval, optlen);
3fdadf7d
DM		 3102 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
3103}
3104EXPORT_SYMBOL(compat_sock_common_getsockopt);
3105#endif
3106
1b784140
YX		 3107int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
3108 int flags)
1da177e4
LT		 3109{
3110 struct sock *sk = sock->sk;
3111 int addr_len = 0;
3112 int err;
3113
1b784140 3114 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
1da177e4
LT		 3115 flags & ~MSG_DONTWAIT, &addr_len);
3116 if (err >= 0)
3117 msg->msg_namelen = addr_len;
3118 return err;
3119}
1da177e4
LT		 3120EXPORT_SYMBOL(sock_common_recvmsg);
3121
3122/*
3123 * Set socket options on an inet socket.
3124 */
3125int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 3126 char __user *optval, unsigned int optlen)
1da177e4
LT		 3127{
3128 struct sock *sk = sock->sk;
3129
3130 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
3131}
1da177e4
LT		 3132EXPORT_SYMBOL(sock_common_setsockopt);
3133
3fdadf7d 3134#ifdef CONFIG_COMPAT
543d9cfe 3135int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 3136 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 3137{
3138 struct sock *sk = sock->sk;
3139
543d9cfe
ACM		 3140 if (sk->sk_prot->compat_setsockopt != NULL)
3141 return sk->sk_prot->compat_setsockopt(sk, level, optname,
3142 optval, optlen);
3fdadf7d
DM		 3143 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
3144}
3145EXPORT_SYMBOL(compat_sock_common_setsockopt);
3146#endif
3147
1da177e4
LT		 3148void sk_common_release(struct sock *sk)
3149{
3150 if (sk->sk_prot->destroy)
3151 sk->sk_prot->destroy(sk);
3152
3153 /*
3154 * Observation: when sock_common_release is called, processes have
3155 * no access to socket. But net still has.
3156 * Step one, detach it from networking:
3157 *
3158 * A. Remove from hash tables.
3159 */
3160
3161 sk->sk_prot->unhash(sk);
3162
3163 /*
3164 * In this point socket cannot receive new packets, but it is possible
3165 * that some packets are in flight because some CPU runs receiver and
3166 * did hash table lookup before we unhashed socket. They will achieve
3167 * receive queue and will be purged by socket destructor.
3168 *
3169 * Also we still have packets pending on receive queue and probably,
3170 * our own packets waiting in device queues. sock_destroy will drain
3171 * receive queue, but transmitted packets will delay socket destruction
3172 * until the last reference will be released.
3173 */
3174
3175 sock_orphan(sk);
3176
3177 xfrm_sk_free_policy(sk);
3178
e6848976 3179 sk_refcnt_debug_release(sk);
5640f768 3180
1da177e4
LT		 3181 sock_put(sk);
3182}
1da177e4
LT		 3183EXPORT_SYMBOL(sk_common_release);
3184
a2d133b1
JH		 3185void sk_get_meminfo(const struct sock *sk, u32 *mem)
3186{
3187 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
3188
3189 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
3190 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
3191 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
3192 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
3193 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
3194 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
3195 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
3196 mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
3197 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
3198}
3199
13ff3d6f
PE		 3200#ifdef CONFIG_PROC_FS
3201#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 3202struct prot_inuse {
3203 int val[PROTO_INUSE_NR];
3204};
13ff3d6f
PE		 3205
3206static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159 3207
70ee1159
PE		 3208void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
3209{
08fc7f81 3210 __this_cpu_add(net->core.prot_inuse->val[prot->inuse_idx], val);
70ee1159
PE		 3211}
3212EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
3213
3214int sock_prot_inuse_get(struct net *net, struct proto *prot)
3215{
3216 int cpu, idx = prot->inuse_idx;
3217 int res = 0;
3218
3219 for_each_possible_cpu(cpu)
08fc7f81 3220 res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx];
70ee1159
PE		 3221
3222 return res >= 0 ? res : 0;
3223}
3224EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
3225
648845ab
TZ		 3226static void sock_inuse_add(struct net *net, int val)
3227{
3228 this_cpu_add(*net->core.sock_inuse, val);
3229}
3230
3231int sock_inuse_get(struct net *net)
3232{
3233 int cpu, res = 0;
3234
3235 for_each_possible_cpu(cpu)
3236 res += *per_cpu_ptr(net->core.sock_inuse, cpu);
3237
3238 return res;
3239}
3240
3241EXPORT_SYMBOL_GPL(sock_inuse_get);
3242
2c8c1e72 3243static int __net_init sock_inuse_init_net(struct net *net)
70ee1159 3244{
08fc7f81 3245 net->core.prot_inuse = alloc_percpu(struct prot_inuse);
648845ab
TZ		 3246 if (net->core.prot_inuse == NULL)
3247 return -ENOMEM;
3248
3249 net->core.sock_inuse = alloc_percpu(int);
3250 if (net->core.sock_inuse == NULL)
3251 goto out;
3252
3253 return 0;
3254
3255out:
3256 free_percpu(net->core.prot_inuse);
3257 return -ENOMEM;
70ee1159
PE		 3258}
3259
2c8c1e72 3260static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159 3261{
08fc7f81 3262 free_percpu(net->core.prot_inuse);
648845ab 3263 free_percpu(net->core.sock_inuse);
70ee1159
PE		 3264}
3265
3266static struct pernet_operations net_inuse_ops = {
3267 .init = sock_inuse_init_net,
3268 .exit = sock_inuse_exit_net,
3269};
3270
3271static __init int net_inuse_init(void)
3272{
3273 if (register_pernet_subsys(&net_inuse_ops))
3274 panic("Cannot initialize net inuse counters");
3275
3276 return 0;
3277}
3278
3279core_initcall(net_inuse_init);
13ff3d6f
PE		 3280
3281static void assign_proto_idx(struct proto *prot)
3282{
3283 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
3284
3285 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 3286 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 3287 return;
3288 }
3289
3290 set_bit(prot->inuse_idx, proto_inuse_idx);
3291}
3292
3293static void release_proto_idx(struct proto *prot)
3294{
3295 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
3296 clear_bit(prot->inuse_idx, proto_inuse_idx);
3297}
3298#else
3299static inline void assign_proto_idx(struct proto *prot)
3300{
3301}
3302
3303static inline void release_proto_idx(struct proto *prot)
3304{
3305}
648845ab
TZ		 3306
3307static void sock_inuse_add(struct net *net, int val)
3308{
3309}
13ff3d6f
PE		 3310#endif
3311
0159dfd3
ED		 3312static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
3313{
3314 if (!rsk_prot)
3315 return;
3316 kfree(rsk_prot->slab_name);
3317 rsk_prot->slab_name = NULL;
adf78eda
JL		 3318 kmem_cache_destroy(rsk_prot->slab);
3319 rsk_prot->slab = NULL;
0159dfd3
ED		 3320}
3321
3322static int req_prot_init(const struct proto *prot)
3323{
3324 struct request_sock_ops *rsk_prot = prot->rsk_prot;
3325
3326 if (!rsk_prot)
3327 return 0;
3328
3329 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
3330 prot->name);
3331 if (!rsk_prot->slab_name)
3332 return -ENOMEM;
3333
3334 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
3335 rsk_prot->obj_size, 0,
e699e2c6
SB		 3336 SLAB_ACCOUNT | prot->slab_flags,
3337 NULL);
0159dfd3
ED		 3338
3339 if (!rsk_prot->slab) {
3340 pr_crit("%s: Can't create request sock SLAB cache!\n",
3341 prot->name);
3342 return -ENOMEM;
3343 }
3344 return 0;
3345}
3346
b733c007
PE		 3347int proto_register(struct proto *prot, int alloc_slab)
3348{
1da177e4 3349 if (alloc_slab) {
30c2c9f1
DW		 3350 prot->slab = kmem_cache_create_usercopy(prot->name,
3351 prot->obj_size, 0,
e699e2c6
SB		 3352 SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT |
3353 prot->slab_flags,
289a4860 3354 prot->useroffset, prot->usersize,
271b72c7 3355 NULL);
1da177e4
LT		 3356
3357 if (prot->slab == NULL) {
e005d193
JP		 3358 pr_crit("%s: Can't create sock SLAB cache!\n",
3359 prot->name);
60e7663d 3360 goto out;
1da177e4 3361 }
2e6599cb 3362
0159dfd3
ED		 3363 if (req_prot_init(prot))
3364 goto out_free_request_sock_slab;
8feaf0c0 3365
6d6ee43e 3366 if (prot->twsk_prot != NULL) {
faf23422 3367 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 3368
7e56b5d6 3369 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 3370 goto out_free_request_sock_slab;
3371
6d6ee43e 3372 prot->twsk_prot->twsk_slab =
7e56b5d6 3373 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 3374 prot->twsk_prot->twsk_obj_size,
3ab5aee7 3375 0,
e699e2c6 3376 SLAB_ACCOUNT |
52db70dc 3377 prot->slab_flags,
20c2df83 3378 NULL);
6d6ee43e 3379 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 3380 goto out_free_timewait_sock_slab_name;
3381 }
1da177e4
LT		 3382 }
3383
36b77a52 3384 mutex_lock(&proto_list_mutex);
1da177e4 3385 list_add(&prot->node, &proto_list);
13ff3d6f 3386 assign_proto_idx(prot);
36b77a52 3387 mutex_unlock(&proto_list_mutex);
b733c007
PE		 3388 return 0;
3389
8feaf0c0 3390out_free_timewait_sock_slab_name:
7e56b5d6 3391 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0 3392out_free_request_sock_slab:
0159dfd3
ED		 3393 req_prot_cleanup(prot->rsk_prot);
3394
2e6599cb
ACM		 3395 kmem_cache_destroy(prot->slab);
3396 prot->slab = NULL;
b733c007
PE		 3397out:
3398 return -ENOBUFS;
1da177e4 3399}
1da177e4
LT		 3400EXPORT_SYMBOL(proto_register);
3401
3402void proto_unregister(struct proto *prot)
3403{
36b77a52 3404 mutex_lock(&proto_list_mutex);
13ff3d6f 3405 release_proto_idx(prot);
0a3f4358 3406 list_del(&prot->node);
36b77a52 3407 mutex_unlock(&proto_list_mutex);
1da177e4 3408
adf78eda
JL		 3409 kmem_cache_destroy(prot->slab);
3410 prot->slab = NULL;
1da177e4 3411
0159dfd3 3412 req_prot_cleanup(prot->rsk_prot);
2e6599cb 3413
6d6ee43e 3414 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 3415 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 3416 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 3417 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 3418 }
1da177e4 3419}
1da177e4
LT		 3420EXPORT_SYMBOL(proto_unregister);
3421
bf2ae2e4
XL		 3422int sock_load_diag_module(int family, int protocol)
3423{
3424 if (!protocol) {
3425 if (!sock_is_registered(family))
3426 return -ENOENT;
3427
3428 return request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
3429 NETLINK_SOCK_DIAG, family);
3430 }
3431
3432#ifdef CONFIG_INET
3433 if (family == AF_INET &&
c34c1287 3434 protocol != IPPROTO_RAW &&
bf2ae2e4
XL		 3435 !rcu_access_pointer(inet_protos[protocol]))
3436 return -ENOENT;
3437#endif
3438
3439 return request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
3440 NETLINK_SOCK_DIAG, family, protocol);
3441}
3442EXPORT_SYMBOL(sock_load_diag_module);
3443
1da177e4 3444#ifdef CONFIG_PROC_FS
1da177e4 3445static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 3446 __acquires(proto_list_mutex)
1da177e4 3447{
36b77a52 3448 mutex_lock(&proto_list_mutex);
60f0438a 3449 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 3450}
3451
3452static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3453{
60f0438a 3454 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 3455}
3456
3457static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 3458 __releases(proto_list_mutex)
1da177e4 3459{
36b77a52 3460 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 3461}
3462
3463static char proto_method_implemented(const void *method)
3464{
3465 return method == NULL ? 'n' : 'y';
3466}
180d8cd9
GC		 3467static long sock_prot_memory_allocated(struct proto *proto)
3468{
cb75a36c 3469 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 3470}
3471
3472static char *sock_prot_memory_pressure(struct proto *proto)
3473{
3474 return proto->memory_pressure != NULL ?
3475 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
3476}
1da177e4
LT		 3477
3478static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
3479{
180d8cd9 3480
8d987e5c 3481 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 3482 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3483 proto->name,
3484 proto->obj_size,
14e943db 3485 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 3486 sock_prot_memory_allocated(proto),
3487 sock_prot_memory_pressure(proto),
1da177e4
LT		 3488 proto->max_header,
3489 proto->slab == NULL ? "no" : "yes",
3490 module_name(proto->owner),
3491 proto_method_implemented(proto->close),
3492 proto_method_implemented(proto->connect),
3493 proto_method_implemented(proto->disconnect),
3494 proto_method_implemented(proto->accept),
3495 proto_method_implemented(proto->ioctl),
3496 proto_method_implemented(proto->init),
3497 proto_method_implemented(proto->destroy),
3498 proto_method_implemented(proto->shutdown),
3499 proto_method_implemented(proto->setsockopt),
3500 proto_method_implemented(proto->getsockopt),
3501 proto_method_implemented(proto->sendmsg),
3502 proto_method_implemented(proto->recvmsg),
3503 proto_method_implemented(proto->sendpage),
3504 proto_method_implemented(proto->bind),
3505 proto_method_implemented(proto->backlog_rcv),
3506 proto_method_implemented(proto->hash),
3507 proto_method_implemented(proto->unhash),
3508 proto_method_implemented(proto->get_port),
3509 proto_method_implemented(proto->enter_memory_pressure));
3510}
3511
3512static int proto_seq_show(struct seq_file *seq, void *v)
3513{
60f0438a 3514 if (v == &proto_list)
1da177e4
LT		 3515 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3516 "protocol",
3517 "size",
3518 "sockets",
3519 "memory",
3520 "press",
3521 "maxhdr",
3522 "slab",
3523 "module",
3524 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3525 else
60f0438a 3526 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 3527 return 0;
3528}
3529
f690808e 3530static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 3531 .start = proto_seq_start,
3532 .next = proto_seq_next,
3533 .stop = proto_seq_stop,
3534 .show = proto_seq_show,
3535};
3536
14e943db
ED		 3537static __net_init int proto_init_net(struct net *net)
3538{
c3506372
CH		 3539 if (!proc_create_net("protocols", 0444, net->proc_net, &proto_seq_ops,
3540 sizeof(struct seq_net_private)))
14e943db
ED		 3541 return -ENOMEM;
3542
3543 return 0;
3544}
3545
3546static __net_exit void proto_exit_net(struct net *net)
3547{
ece31ffd 3548 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 3549}
3550
3551
3552static __net_initdata struct pernet_operations proto_net_ops = {
3553 .init = proto_init_net,
3554 .exit = proto_exit_net,
1da177e4
LT		 3555};
3556
3557static int __init proto_init(void)
3558{
14e943db 3559 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 3560}
3561
3562subsys_initcall(proto_init);
3563
3564#endif /* PROC_FS */
7db6b048
SS		 3565
3566#ifdef CONFIG_NET_RX_BUSY_POLL
3567bool sk_busy_loop_end(void *p, unsigned long start_time)
3568{
3569 struct sock *sk = p;
3570
3571 return !skb_queue_empty(&sk->sk_receive_queue) ||
3572 sk_busy_loop_timeout(sk, start_time);
3573}
3574EXPORT_SYMBOL(sk_busy_loop_end);
3575#endif /* CONFIG_NET_RX_BUSY_POLL */
Linux 6.x block layer and io_uring tree(s)