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2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4
LT		 2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Generic socket support routines. Memory allocators, socket lock/release
8 * handler for protocols to use and generic option handler.
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:
1da177e4
LT		 84 */
85
e005d193
JP		 86#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
87
80b14dee 88#include <asm/unaligned.h>
4fc268d2 89#include <linux/capability.h>
1da177e4 90#include <linux/errno.h>
cb820f8e 91#include <linux/errqueue.h>
1da177e4
LT		 92#include <linux/types.h>
93#include <linux/socket.h>
94#include <linux/in.h>
95#include <linux/kernel.h>
1da177e4
LT		 96#include <linux/module.h>
97#include <linux/proc_fs.h>
98#include <linux/seq_file.h>
99#include <linux/sched.h>
f1083048 100#include <linux/sched/mm.h>
1da177e4
LT		 101#include <linux/timer.h>
102#include <linux/string.h>
103#include <linux/sockios.h>
104#include <linux/net.h>
105#include <linux/mm.h>
106#include <linux/slab.h>
107#include <linux/interrupt.h>
108#include <linux/poll.h>
109#include <linux/tcp.h>
110#include <linux/init.h>
a1f8e7f7 111#include <linux/highmem.h>
3f551f94 112#include <linux/user_namespace.h>
c5905afb 113#include <linux/static_key.h>
3969eb38 114#include <linux/memcontrol.h>
8c1ae10d 115#include <linux/prefetch.h>
a6c0d093 116#include <linux/compat.h>
1da177e4 117
7c0f6ba6 118#include <linux/uaccess.h>
1da177e4
LT		 119
120#include <linux/netdevice.h>
121#include <net/protocol.h>
122#include <linux/skbuff.h>
457c4cbc 123#include <net/net_namespace.h>
2e6599cb 124#include <net/request_sock.h>
1da177e4 125#include <net/sock.h>
20d49473 126#include <linux/net_tstamp.h>
1da177e4
LT		 127#include <net/xfrm.h>
128#include <linux/ipsec.h>
f8451725 129#include <net/cls_cgroup.h>
5bc1421e 130#include <net/netprio_cgroup.h>
eb4cb008 131#include <linux/sock_diag.h>
1da177e4
LT		 132
133#include <linux/filter.h>
538950a1 134#include <net/sock_reuseport.h>
6ac99e8f 135#include <net/bpf_sk_storage.h>
1da177e4 136
3847ce32
SM		 137#include <trace/events/sock.h>
138
1da177e4 139#include <net/tcp.h>
076bb0c8 140#include <net/busy_poll.h>
06021292 141
36b77a52 142static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 143static LIST_HEAD(proto_list);
144
648845ab
TZ		 145static void sock_inuse_add(struct net *net, int val);
146
a3b299da
EB		 147/**
148 * sk_ns_capable - General socket capability test
149 * @sk: Socket to use a capability on or through
150 * @user_ns: The user namespace of the capability to use
151 * @cap: The capability to use
152 *
153 * Test to see if the opener of the socket had when the socket was
154 * created and the current process has the capability @cap in the user
155 * namespace @user_ns.
156 */
157bool sk_ns_capable(const struct sock *sk,
158 struct user_namespace *user_ns, int cap)
159{
160 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
161 ns_capable(user_ns, cap);
162}
163EXPORT_SYMBOL(sk_ns_capable);
164
165/**
166 * sk_capable - Socket global capability test
167 * @sk: Socket to use a capability on or through
e793c0f7 168 * @cap: The global capability to use
a3b299da
EB		 169 *
170 * Test to see if the opener of the socket had when the socket was
171 * created and the current process has the capability @cap in all user
172 * namespaces.
173 */
174bool sk_capable(const struct sock *sk, int cap)
175{
176 return sk_ns_capable(sk, &init_user_ns, cap);
177}
178EXPORT_SYMBOL(sk_capable);
179
180/**
181 * sk_net_capable - Network namespace socket capability test
182 * @sk: Socket to use a capability on or through
183 * @cap: The capability to use
184 *
e793c0f7 185 * Test to see if the opener of the socket had when the socket was created
a3b299da
EB		 186 * and the current process has the capability @cap over the network namespace
187 * the socket is a member of.
188 */
189bool sk_net_capable(const struct sock *sk, int cap)
190{
191 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
192}
193EXPORT_SYMBOL(sk_net_capable);
194
da21f24d
IM		 195/*
196 * Each address family might have different locking rules, so we have
cdfbabfb
DH		 197 * one slock key per address family and separate keys for internal and
198 * userspace sockets.
da21f24d 199 */
a5b5bb9a 200static struct lock_class_key af_family_keys[AF_MAX];
cdfbabfb 201static struct lock_class_key af_family_kern_keys[AF_MAX];
a5b5bb9a 202static struct lock_class_key af_family_slock_keys[AF_MAX];
cdfbabfb 203static struct lock_class_key af_family_kern_slock_keys[AF_MAX];
a5b5bb9a 204
a5b5bb9a
IM		 205/*
206 * Make lock validator output more readable. (we pre-construct these
207 * strings build-time, so that runtime initialization of socket
208 * locks is fast):
209 */
cdfbabfb
DH		 210
211#define _sock_locks(x) \
212 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \
213 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \
214 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \
215 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \
216 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \
217 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \
218 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \
219 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \
220 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \
221 x "27" , x "28" , x "AF_CAN" , \
222 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \
223 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \
224 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \
225 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \
68e8b849
BT		 226 x "AF_QIPCRTR", x "AF_SMC" , x "AF_XDP" , \
227 x "AF_MAX"
cdfbabfb 228
36cbd3dc 229static const char *const af_family_key_strings[AF_MAX+1] = {
cdfbabfb 230 _sock_locks("sk_lock-")
a5b5bb9a 231};
36cbd3dc 232static const char *const af_family_slock_key_strings[AF_MAX+1] = {
cdfbabfb 233 _sock_locks("slock-")
a5b5bb9a 234};
36cbd3dc 235static const char *const af_family_clock_key_strings[AF_MAX+1] = {
cdfbabfb
DH		 236 _sock_locks("clock-")
237};
238
239static const char *const af_family_kern_key_strings[AF_MAX+1] = {
240 _sock_locks("k-sk_lock-")
241};
242static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = {
243 _sock_locks("k-slock-")
244};
245static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = {
246 _sock_locks("k-clock-")
443aef0e 247};
581319c5 248static const char *const af_family_rlock_key_strings[AF_MAX+1] = {
6b431d50 249 _sock_locks("rlock-")
581319c5
PA		 250};
251static const char *const af_family_wlock_key_strings[AF_MAX+1] = {
6b431d50 252 _sock_locks("wlock-")
581319c5
PA		 253};
254static const char *const af_family_elock_key_strings[AF_MAX+1] = {
6b431d50 255 _sock_locks("elock-")
581319c5 256};
da21f24d
IM		 257
258/*
581319c5 259 * sk_callback_lock and sk queues locking rules are per-address-family,
da21f24d
IM		 260 * so split the lock classes by using a per-AF key:
261 */
262static struct lock_class_key af_callback_keys[AF_MAX];
581319c5
PA		 263static struct lock_class_key af_rlock_keys[AF_MAX];
264static struct lock_class_key af_wlock_keys[AF_MAX];
265static struct lock_class_key af_elock_keys[AF_MAX];
cdfbabfb 266static struct lock_class_key af_kern_callback_keys[AF_MAX];
da21f24d 267
1da177e4 268/* Run time adjustable parameters. */
ab32ea5d 269__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 270EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 271__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 272EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 273__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
274__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 275
25985edc 276/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 277int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 278EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 279
b245be1f
WB		 280int sysctl_tstamp_allow_data __read_mostly = 1;
281
a7950ae8
DB		 282DEFINE_STATIC_KEY_FALSE(memalloc_socks_key);
283EXPORT_SYMBOL_GPL(memalloc_socks_key);
c93bdd0e 284
7cb02404
MG		 285/**
286 * sk_set_memalloc - sets %SOCK_MEMALLOC
287 * @sk: socket to set it on
288 *
289 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
290 * It's the responsibility of the admin to adjust min_free_kbytes
291 * to meet the requirements
292 */
293void sk_set_memalloc(struct sock *sk)
294{
295 sock_set_flag(sk, SOCK_MEMALLOC);
296 sk->sk_allocation |= __GFP_MEMALLOC;
a7950ae8 297 static_branch_inc(&memalloc_socks_key);
7cb02404
MG		 298}
299EXPORT_SYMBOL_GPL(sk_set_memalloc);
300
301void sk_clear_memalloc(struct sock *sk)
302{
303 sock_reset_flag(sk, SOCK_MEMALLOC);
304 sk->sk_allocation &= ~__GFP_MEMALLOC;
a7950ae8 305 static_branch_dec(&memalloc_socks_key);
c76562b6
MG		 306
307 /*
308 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
5d753610
MG		 309 * progress of swapping. SOCK_MEMALLOC may be cleared while
310 * it has rmem allocations due to the last swapfile being deactivated
311 * but there is a risk that the socket is unusable due to exceeding
312 * the rmem limits. Reclaim the reserves and obey rmem limits again.
c76562b6 313 */
5d753610 314 sk_mem_reclaim(sk);
7cb02404
MG		 315}
316EXPORT_SYMBOL_GPL(sk_clear_memalloc);
317
b4b9e355
MG		 318int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
319{
320 int ret;
f1083048 321 unsigned int noreclaim_flag;
b4b9e355
MG		 322
323 /* these should have been dropped before queueing */
324 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
325
f1083048 326 noreclaim_flag = memalloc_noreclaim_save();
b4b9e355 327 ret = sk->sk_backlog_rcv(sk, skb);
f1083048 328 memalloc_noreclaim_restore(noreclaim_flag);
b4b9e355
MG		 329
330 return ret;
331}
332EXPORT_SYMBOL(__sk_backlog_rcv);
333
a9beb86a 334static int sock_get_timeout(long timeo, void *optval, bool old_timeval)
fe0c72f3 335{
a9beb86a 336 struct __kernel_sock_timeval tv;
fe0c72f3
AB		 337
338 if (timeo == MAX_SCHEDULE_TIMEOUT) {
339 tv.tv_sec = 0;
340 tv.tv_usec = 0;
341 } else {
342 tv.tv_sec = timeo / HZ;
343 tv.tv_usec = ((timeo % HZ) * USEC_PER_SEC) / HZ;
344 }
345
e6986423 346 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
fe0c72f3
AB		 347 struct old_timeval32 tv32 = { tv.tv_sec, tv.tv_usec };
348 *(struct old_timeval32 *)optval = tv32;
349 return sizeof(tv32);
350 }
351
a9beb86a
DD		 352 if (old_timeval) {
353 struct __kernel_old_timeval old_tv;
354 old_tv.tv_sec = tv.tv_sec;
355 old_tv.tv_usec = tv.tv_usec;
356 *(struct __kernel_old_timeval *)optval = old_tv;
28e72b26 357 return sizeof(old_tv);
a9beb86a
DD		 358 }
359
28e72b26
VC		 360 *(struct __kernel_sock_timeval *)optval = tv;
361 return sizeof(tv);
fe0c72f3
AB		 362}
363
c34645ac
CH		 364static int sock_set_timeout(long *timeo_p, sockptr_t optval, int optlen,
365 bool old_timeval)
1da177e4 366{
a9beb86a 367 struct __kernel_sock_timeval tv;
1da177e4 368
e6986423 369 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
fe0c72f3
AB		 370 struct old_timeval32 tv32;
371
372 if (optlen < sizeof(tv32))
373 return -EINVAL;
374
c34645ac 375 if (copy_from_sockptr(&tv32, optval, sizeof(tv32)))
fe0c72f3
AB		 376 return -EFAULT;
377 tv.tv_sec = tv32.tv_sec;
378 tv.tv_usec = tv32.tv_usec;
a9beb86a
DD		 379 } else if (old_timeval) {
380 struct __kernel_old_timeval old_tv;
381
382 if (optlen < sizeof(old_tv))
383 return -EINVAL;
c34645ac 384 if (copy_from_sockptr(&old_tv, optval, sizeof(old_tv)))
a9beb86a
DD		 385 return -EFAULT;
386 tv.tv_sec = old_tv.tv_sec;
387 tv.tv_usec = old_tv.tv_usec;
fe0c72f3
AB		 388 } else {
389 if (optlen < sizeof(tv))
390 return -EINVAL;
c34645ac 391 if (copy_from_sockptr(&tv, optval, sizeof(tv)))
fe0c72f3
AB		 392 return -EFAULT;
393 }
ba78073e
VA		 394 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
395 return -EDOM;
1da177e4 396
ba78073e 397 if (tv.tv_sec < 0) {
6f11df83
AM		 398 static int warned __read_mostly;
399
ba78073e 400 *timeo_p = 0;
50aab54f 401 if (warned < 10 && net_ratelimit()) {
ba78073e 402 warned++;
e005d193
JP		 403 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
404 __func__, current->comm, task_pid_nr(current));
50aab54f 405 }
ba78073e
VA		 406 return 0;
407 }
1da177e4
LT		 408 *timeo_p = MAX_SCHEDULE_TIMEOUT;
409 if (tv.tv_sec == 0 && tv.tv_usec == 0)
410 return 0;
a9beb86a
DD		 411 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1))
412 *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP((unsigned long)tv.tv_usec, USEC_PER_SEC / HZ);
1da177e4
LT		 413 return 0;
414}
415
416static void sock_warn_obsolete_bsdism(const char *name)
417{
418 static int warned;
419 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 420 if (strcmp(warncomm, current->comm) && warned < 5) {
421 strcpy(warncomm, current->comm);
e005d193
JP		 422 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
423 warncomm, name);
1da177e4
LT		 424 warned++;
425 }
426}
427
080a270f
HFS		 428static bool sock_needs_netstamp(const struct sock *sk)
429{
430 switch (sk->sk_family) {
431 case AF_UNSPEC:
432 case AF_UNIX:
433 return false;
434 default:
435 return true;
436 }
437}
438
08e29af3 439static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 440{
08e29af3
ED		 441 if (sk->sk_flags & flags) {
442 sk->sk_flags &= ~flags;
080a270f
HFS		 443 if (sock_needs_netstamp(sk) &&
444 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 445 net_disable_timestamp();
1da177e4
LT		 446 }
447}
448
449
e6afc8ac 450int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
f0088a50 451{
3b885787
NH		 452 unsigned long flags;
453 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 454
0fd7bac6 455 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 456 atomic_inc(&sk->sk_drops);
3847ce32 457 trace_sock_rcvqueue_full(sk, skb);
766e9037 458 return -ENOMEM;
f0088a50
DV		 459 }
460
c76562b6 461 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 462 atomic_inc(&sk->sk_drops);
463 return -ENOBUFS;
3ab224be
HA		 464 }
465
f0088a50
DV		 466 skb->dev = NULL;
467 skb_set_owner_r(skb, sk);
49ad9599 468
7fee226a
ED		 469 /* we escape from rcu protected region, make sure we dont leak
470 * a norefcounted dst
471 */
472 skb_dst_force(skb);
473
3b885787 474 spin_lock_irqsave(&list->lock, flags);
3bc3b96f 475 sock_skb_set_dropcount(sk, skb);
3b885787
NH		 476 __skb_queue_tail(list, skb);
477 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 478
479 if (!sock_flag(sk, SOCK_DEAD))
676d2369 480 sk->sk_data_ready(sk);
766e9037 481 return 0;
f0088a50 482}
e6afc8ac 483EXPORT_SYMBOL(__sock_queue_rcv_skb);
484
485int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
486{
487 int err;
488
489 err = sk_filter(sk, skb);
490 if (err)
491 return err;
492
493 return __sock_queue_rcv_skb(sk, skb);
494}
f0088a50
DV		 495EXPORT_SYMBOL(sock_queue_rcv_skb);
496
4f0c40d9 497int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
c3f24cfb 498 const int nested, unsigned int trim_cap, bool refcounted)
f0088a50
DV		 499{
500 int rc = NET_RX_SUCCESS;
501
4f0c40d9 502 if (sk_filter_trim_cap(sk, skb, trim_cap))
f0088a50
DV		 503 goto discard_and_relse;
504
505 skb->dev = NULL;
506
274f482d 507 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 508 atomic_inc(&sk->sk_drops);
509 goto discard_and_relse;
510 }
58a5a7b9
ACM		 511 if (nested)
512 bh_lock_sock_nested(sk);
513 else
514 bh_lock_sock(sk);
a5b5bb9a
IM		 515 if (!sock_owned_by_user(sk)) {
516 /*
517 * trylock + unlock semantics:
518 */
519 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
520
c57943a1 521 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a 522
5facae4f 523 mutex_release(&sk->sk_lock.dep_map, _RET_IP_);
8265792b 524 } else if (sk_add_backlog(sk, skb, READ_ONCE(sk->sk_rcvbuf))) {
8eae939f
ZY		 525 bh_unlock_sock(sk);
526 atomic_inc(&sk->sk_drops);
527 goto discard_and_relse;
528 }
529
f0088a50
DV		 530 bh_unlock_sock(sk);
531out:
c3f24cfb
ED		 532 if (refcounted)
533 sock_put(sk);
f0088a50
DV		 534 return rc;
535discard_and_relse:
536 kfree_skb(skb);
537 goto out;
538}
4f0c40d9 539EXPORT_SYMBOL(__sk_receive_skb);
f0088a50
DV		 540
541struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
542{
b6c6712a 543 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 544
545 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 546 sk_tx_queue_clear(sk);
9b8805a3 547 sk->sk_dst_pending_confirm = 0;
a9b3cd7f 548 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 549 dst_release(dst);
550 return NULL;
551 }
552
553 return dst;
554}
555EXPORT_SYMBOL(__sk_dst_check);
556
557struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
558{
559 struct dst_entry *dst = sk_dst_get(sk);
560
561 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
562 sk_dst_reset(sk);
563 dst_release(dst);
564 return NULL;
565 }
566
567 return dst;
568}
569EXPORT_SYMBOL(sk_dst_check);
570
7594888c 571static int sock_bindtoindex_locked(struct sock *sk, int ifindex)
4878809f
DM		 572{
573 int ret = -ENOPROTOOPT;
574#ifdef CONFIG_NETDEVICES
3b1e0a65 575 struct net *net = sock_net(sk);
4878809f
DM		 576
577 /* Sorry... */
578 ret = -EPERM;
c427bfec 579 if (sk->sk_bound_dev_if && !ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 580 goto out;
581
f5dd3d0c
DH		 582 ret = -EINVAL;
583 if (ifindex < 0)
584 goto out;
585
586 sk->sk_bound_dev_if = ifindex;
587 if (sk->sk_prot->rehash)
588 sk->sk_prot->rehash(sk);
589 sk_dst_reset(sk);
590
591 ret = 0;
592
593out:
594#endif
595
596 return ret;
597}
598
8ea204c2 599int sock_bindtoindex(struct sock *sk, int ifindex, bool lock_sk)
7594888c
CH		 600{
601 int ret;
602
8ea204c2
FF		 603 if (lock_sk)
604 lock_sock(sk);
7594888c 605 ret = sock_bindtoindex_locked(sk, ifindex);
8ea204c2
FF		 606 if (lock_sk)
607 release_sock(sk);
7594888c
CH		 608
609 return ret;
610}
611EXPORT_SYMBOL(sock_bindtoindex);
612
5790642b 613static int sock_setbindtodevice(struct sock *sk, sockptr_t optval, int optlen)
f5dd3d0c
DH		 614{
615 int ret = -ENOPROTOOPT;
616#ifdef CONFIG_NETDEVICES
617 struct net *net = sock_net(sk);
618 char devname[IFNAMSIZ];
619 int index;
620
4878809f
DM		 621 ret = -EINVAL;
622 if (optlen < 0)
623 goto out;
624
625 /* Bind this socket to a particular device like "eth0",
626 * as specified in the passed interface name. If the
627 * name is "" or the option length is zero the socket
628 * is not bound.
629 */
630 if (optlen > IFNAMSIZ - 1)
631 optlen = IFNAMSIZ - 1;
632 memset(devname, 0, sizeof(devname));
633
634 ret = -EFAULT;
5790642b 635 if (copy_from_sockptr(devname, optval, optlen))
4878809f
DM		 636 goto out;
637
000ba2e4
DM		 638 index = 0;
639 if (devname[0] != '\0') {
bf8e56bf 640 struct net_device *dev;
4878809f 641
bf8e56bf
ED		 642 rcu_read_lock();
643 dev = dev_get_by_name_rcu(net, devname);
644 if (dev)
645 index = dev->ifindex;
646 rcu_read_unlock();
4878809f
DM		 647 ret = -ENODEV;
648 if (!dev)
649 goto out;
4878809f
DM		 650 }
651
8ea204c2 652 return sock_bindtoindex(sk, index, true);
4878809f
DM		 653out:
654#endif
655
656 return ret;
657}
658
c91f6df2
BH		 659static int sock_getbindtodevice(struct sock *sk, char __user *optval,
660 int __user *optlen, int len)
661{
662 int ret = -ENOPROTOOPT;
663#ifdef CONFIG_NETDEVICES
664 struct net *net = sock_net(sk);
c91f6df2 665 char devname[IFNAMSIZ];
c91f6df2
BH		 666
667 if (sk->sk_bound_dev_if == 0) {
668 len = 0;
669 goto zero;
670 }
671
672 ret = -EINVAL;
673 if (len < IFNAMSIZ)
674 goto out;
675
5dbe7c17
NS		 676 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
677 if (ret)
c91f6df2 678 goto out;
c91f6df2
BH		 679
680 len = strlen(devname) + 1;
681
682 ret = -EFAULT;
683 if (copy_to_user(optval, devname, len))
684 goto out;
685
686zero:
687 ret = -EFAULT;
688 if (put_user(len, optlen))
689 goto out;
690
691 ret = 0;
692
693out:
694#endif
695
696 return ret;
697}
698
f60e5990 699bool sk_mc_loop(struct sock *sk)
700{
701 if (dev_recursion_level())
702 return false;
703 if (!sk)
704 return true;
705 switch (sk->sk_family) {
706 case AF_INET:
707 return inet_sk(sk)->mc_loop;
708#if IS_ENABLED(CONFIG_IPV6)
709 case AF_INET6:
710 return inet6_sk(sk)->mc_loop;
711#endif
712 }
0ad6f6e7 713 WARN_ON_ONCE(1);
f60e5990 714 return true;
715}
716EXPORT_SYMBOL(sk_mc_loop);
717
b58f0e8f
CH		 718void sock_set_reuseaddr(struct sock *sk)
719{
720 lock_sock(sk);
721 sk->sk_reuse = SK_CAN_REUSE;
722 release_sock(sk);
723}
724EXPORT_SYMBOL(sock_set_reuseaddr);
725
fe31a326
CH		 726void sock_set_reuseport(struct sock *sk)
727{
728 lock_sock(sk);
729 sk->sk_reuseport = true;
730 release_sock(sk);
731}
732EXPORT_SYMBOL(sock_set_reuseport);
733
c433594c
CH		 734void sock_no_linger(struct sock *sk)
735{
736 lock_sock(sk);
737 sk->sk_lingertime = 0;
738 sock_set_flag(sk, SOCK_LINGER);
739 release_sock(sk);
740}
741EXPORT_SYMBOL(sock_no_linger);
742
6e434967
CH		 743void sock_set_priority(struct sock *sk, u32 priority)
744{
745 lock_sock(sk);
746 sk->sk_priority = priority;
747 release_sock(sk);
748}
749EXPORT_SYMBOL(sock_set_priority);
750
76ee0785
CH		 751void sock_set_sndtimeo(struct sock *sk, s64 secs)
752{
753 lock_sock(sk);
754 if (secs && secs < MAX_SCHEDULE_TIMEOUT / HZ - 1)
755 sk->sk_sndtimeo = secs * HZ;
756 else
757 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
758 release_sock(sk);
759}
760EXPORT_SYMBOL(sock_set_sndtimeo);
761
783da70e
CH		 762static void __sock_set_timestamps(struct sock *sk, bool val, bool new, bool ns)
763{
764 if (val) {
765 sock_valbool_flag(sk, SOCK_TSTAMP_NEW, new);
766 sock_valbool_flag(sk, SOCK_RCVTSTAMPNS, ns);
767 sock_set_flag(sk, SOCK_RCVTSTAMP);
768 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
769 } else {
770 sock_reset_flag(sk, SOCK_RCVTSTAMP);
771 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
772 sock_reset_flag(sk, SOCK_TSTAMP_NEW);
773 }
774}
775
776void sock_enable_timestamps(struct sock *sk)
777{
778 lock_sock(sk);
779 __sock_set_timestamps(sk, true, false, true);
780 release_sock(sk);
781}
782EXPORT_SYMBOL(sock_enable_timestamps);
783
ce3d9544
CH		 784void sock_set_keepalive(struct sock *sk)
785{
786 lock_sock(sk);
787 if (sk->sk_prot->keepalive)
788 sk->sk_prot->keepalive(sk, true);
789 sock_valbool_flag(sk, SOCK_KEEPOPEN, true);
790 release_sock(sk);
791}
792EXPORT_SYMBOL(sock_set_keepalive);
793
26cfabf9
CH		 794static void __sock_set_rcvbuf(struct sock *sk, int val)
795{
796 /* Ensure val * 2 fits into an int, to prevent max_t() from treating it
797 * as a negative value.
798 */
799 val = min_t(int, val, INT_MAX / 2);
800 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
801
802 /* We double it on the way in to account for "struct sk_buff" etc.
803 * overhead. Applications assume that the SO_RCVBUF setting they make
804 * will allow that much actual data to be received on that socket.
805 *
806 * Applications are unaware that "struct sk_buff" and other overheads
807 * allocate from the receive buffer during socket buffer allocation.
808 *
809 * And after considering the possible alternatives, returning the value
810 * we actually used in getsockopt is the most desirable behavior.
811 */
812 WRITE_ONCE(sk->sk_rcvbuf, max_t(int, val * 2, SOCK_MIN_RCVBUF));
813}
814
815void sock_set_rcvbuf(struct sock *sk, int val)
816{
817 lock_sock(sk);
818 __sock_set_rcvbuf(sk, val);
819 release_sock(sk);
820}
821EXPORT_SYMBOL(sock_set_rcvbuf);
822
84d1c617
AA		 823void sock_set_mark(struct sock *sk, u32 val)
824{
825 lock_sock(sk);
826 sk->sk_mark = val;
827 release_sock(sk);
828}
829EXPORT_SYMBOL(sock_set_mark);
830
1da177e4
LT		 831/*
832 * This is meant for all protocols to use and covers goings on
833 * at the socket level. Everything here is generic.
834 */
835
836int sock_setsockopt(struct socket *sock, int level, int optname,
c8c1bbb6 837 sockptr_t optval, unsigned int optlen)
1da177e4 838{
80b14dee 839 struct sock_txtime sk_txtime;
2a91525c 840 struct sock *sk = sock->sk;
1da177e4
LT		 841 int val;
842 int valbool;
843 struct linger ling;
844 int ret = 0;
4ec93edb 845
1da177e4
LT		 846 /*
847 * Options without arguments
848 */
849
4878809f 850 if (optname == SO_BINDTODEVICE)
c91f6df2 851 return sock_setbindtodevice(sk, optval, optlen);
4878809f 852
e71a4783
SH		 853 if (optlen < sizeof(int))
854 return -EINVAL;
4ec93edb 855
c8c1bbb6 856 if (copy_from_sockptr(&val, optval, sizeof(val)))
1da177e4 857 return -EFAULT;
4ec93edb 858
2a91525c 859 valbool = val ? 1 : 0;
1da177e4
LT		 860
861 lock_sock(sk);
862
2a91525c 863 switch (optname) {
e71a4783 864 case SO_DEBUG:
2a91525c 865 if (val && !capable(CAP_NET_ADMIN))
e71a4783 866 ret = -EACCES;
2a91525c 867 else
c0ef877b 868 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 869 break;
870 case SO_REUSEADDR:
cdb8744d 871 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 872 break;
055dc21a
TH		 873 case SO_REUSEPORT:
874 sk->sk_reuseport = valbool;
875 break;
e71a4783 876 case SO_TYPE:
49c794e9 877 case SO_PROTOCOL:
0d6038ee 878 case SO_DOMAIN:
e71a4783
SH		 879 case SO_ERROR:
880 ret = -ENOPROTOOPT;
881 break;
882 case SO_DONTROUTE:
c0ef877b 883 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
0fbe82e6 884 sk_dst_reset(sk);
e71a4783
SH		 885 break;
886 case SO_BROADCAST:
887 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
888 break;
889 case SO_SNDBUF:
890 /* Don't error on this BSD doesn't and if you think
82981930
ED		 891 * about it this is right. Otherwise apps have to
892 * play 'guess the biggest size' games. RCVBUF/SNDBUF
893 * are treated in BSD as hints
894 */
895 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 896set_sndbuf:
4057765f
GN		 897 /* Ensure val * 2 fits into an int, to prevent max_t()
898 * from treating it as a negative value.
899 */
900 val = min_t(int, val, INT_MAX / 2);
e71a4783 901 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
e292f05e
ED		 902 WRITE_ONCE(sk->sk_sndbuf,
903 max_t(int, val * 2, SOCK_MIN_SNDBUF));
82981930 904 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 905 sk->sk_write_space(sk);
906 break;
1da177e4 907
e71a4783
SH		 908 case SO_SNDBUFFORCE:
909 if (!capable(CAP_NET_ADMIN)) {
910 ret = -EPERM;
911 break;
912 }
4057765f
GN		 913
914 /* No negative values (to prevent underflow, as val will be
915 * multiplied by 2).
916 */
917 if (val < 0)
918 val = 0;
e71a4783 919 goto set_sndbuf;
b0573dea 920
e71a4783
SH		 921 case SO_RCVBUF:
922 /* Don't error on this BSD doesn't and if you think
82981930
ED		 923 * about it this is right. Otherwise apps have to
924 * play 'guess the biggest size' games. RCVBUF/SNDBUF
925 * are treated in BSD as hints
926 */
26cfabf9 927 __sock_set_rcvbuf(sk, min_t(u32, val, sysctl_rmem_max));
e71a4783
SH		 928 break;
929
930 case SO_RCVBUFFORCE:
931 if (!capable(CAP_NET_ADMIN)) {
932 ret = -EPERM;
1da177e4 933 break;
e71a4783 934 }
4057765f
GN		 935
936 /* No negative values (to prevent underflow, as val will be
937 * multiplied by 2).
938 */
26cfabf9
CH		 939 __sock_set_rcvbuf(sk, max(val, 0));
940 break;
1da177e4 941
e71a4783 942 case SO_KEEPALIVE:
4b9d07a4
UB		 943 if (sk->sk_prot->keepalive)
944 sk->sk_prot->keepalive(sk, valbool);
e71a4783
SH		 945 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
946 break;
947
948 case SO_OOBINLINE:
949 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
950 break;
951
952 case SO_NO_CHECK:
28448b80 953 sk->sk_no_check_tx = valbool;
e71a4783
SH		 954 break;
955
956 case SO_PRIORITY:
5e1fccc0
EB		 957 if ((val >= 0 && val <= 6) ||
958 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 959 sk->sk_priority = val;
960 else
961 ret = -EPERM;
962 break;
963
964 case SO_LINGER:
965 if (optlen < sizeof(ling)) {
966 ret = -EINVAL; /* 1003.1g */
1da177e4 967 break;
e71a4783 968 }
c8c1bbb6 969 if (copy_from_sockptr(&ling, optval, sizeof(ling))) {
e71a4783 970 ret = -EFAULT;
1da177e4 971 break;
e71a4783
SH		 972 }
973 if (!ling.l_onoff)
974 sock_reset_flag(sk, SOCK_LINGER);
975 else {
1da177e4 976#if (BITS_PER_LONG == 32)
e71a4783
SH		 977 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
978 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 979 else
e71a4783
SH		 980#endif
981 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
982 sock_set_flag(sk, SOCK_LINGER);
983 }
984 break;
985
986 case SO_BSDCOMPAT:
987 sock_warn_obsolete_bsdism("setsockopt");
988 break;
989
990 case SO_PASSCRED:
991 if (valbool)
992 set_bit(SOCK_PASSCRED, &sock->flags);
993 else
994 clear_bit(SOCK_PASSCRED, &sock->flags);
995 break;
996
7f1bc6e9 997 case SO_TIMESTAMP_OLD:
783da70e
CH		 998 __sock_set_timestamps(sk, valbool, false, false);
999 break;
887feae3 1000 case SO_TIMESTAMP_NEW:
783da70e
CH		 1001 __sock_set_timestamps(sk, valbool, true, false);
1002 break;
7f1bc6e9 1003 case SO_TIMESTAMPNS_OLD:
783da70e
CH		 1004 __sock_set_timestamps(sk, valbool, false, true);
1005 break;
887feae3 1006 case SO_TIMESTAMPNS_NEW:
783da70e 1007 __sock_set_timestamps(sk, valbool, true, true);
e71a4783 1008 break;
9718475e
DD		 1009 case SO_TIMESTAMPING_NEW:
1010 sock_set_flag(sk, SOCK_TSTAMP_NEW);
df561f66 1011 fallthrough;
7f1bc6e9 1012 case SO_TIMESTAMPING_OLD:
20d49473 1013 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 1014 ret = -EINVAL;
20d49473
PO		 1015 break;
1016 }
b245be1f 1017
09c2d251 1018 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765 1019 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
ac5cc977
WC		 1020 if (sk->sk_protocol == IPPROTO_TCP &&
1021 sk->sk_type == SOCK_STREAM) {
6db8b963
SHY		 1022 if ((1 << sk->sk_state) &
1023 (TCPF_CLOSE | TCPF_LISTEN)) {
4ed2d765
WB		 1024 ret = -EINVAL;
1025 break;
1026 }
1027 sk->sk_tskey = tcp_sk(sk)->snd_una;
1028 } else {
1029 sk->sk_tskey = 0;
1030 }
1031 }
1c885808
FY		 1032
1033 if (val & SOF_TIMESTAMPING_OPT_STATS &&
1034 !(val & SOF_TIMESTAMPING_OPT_TSONLY)) {
1035 ret = -EINVAL;
1036 break;
1037 }
1038
b9f40e21 1039 sk->sk_tsflags = val;
20d49473
PO		 1040 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
1041 sock_enable_timestamp(sk,
1042 SOCK_TIMESTAMPING_RX_SOFTWARE);
9718475e
DD		 1043 else {
1044 if (optname == SO_TIMESTAMPING_NEW)
1045 sock_reset_flag(sk, SOCK_TSTAMP_NEW);
1046
20d49473 1047 sock_disable_timestamp(sk,
08e29af3 1048 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
9718475e 1049 }
20d49473
PO		 1050 break;
1051
e71a4783
SH		 1052 case SO_RCVLOWAT:
1053 if (val < 0)
1054 val = INT_MAX;
d1361840
ED		 1055 if (sock->ops->set_rcvlowat)
1056 ret = sock->ops->set_rcvlowat(sk, val);
1057 else
eac66402 1058 WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
e71a4783
SH		 1059 break;
1060
45bdc661 1061 case SO_RCVTIMEO_OLD:
a9beb86a 1062 case SO_RCVTIMEO_NEW:
c8c1bbb6 1063 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval,
c34645ac 1064 optlen, optname == SO_RCVTIMEO_OLD);
e71a4783
SH		 1065 break;
1066
45bdc661 1067 case SO_SNDTIMEO_OLD:
a9beb86a 1068 case SO_SNDTIMEO_NEW:
c8c1bbb6 1069 ret = sock_set_timeout(&sk->sk_sndtimeo, optval,
c34645ac 1070 optlen, optname == SO_SNDTIMEO_OLD);
e71a4783 1071 break;
1da177e4 1072
4d295e54
CH		 1073 case SO_ATTACH_FILTER: {
1074 struct sock_fprog fprog;
e71a4783 1075
c8c1bbb6 1076 ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
4d295e54 1077 if (!ret)
e71a4783 1078 ret = sk_attach_filter(&fprog, sk);
e71a4783 1079 break;
4d295e54 1080 }
89aa0758
AS		 1081 case SO_ATTACH_BPF:
1082 ret = -EINVAL;
1083 if (optlen == sizeof(u32)) {
1084 u32 ufd;
1085
1086 ret = -EFAULT;
c8c1bbb6 1087 if (copy_from_sockptr(&ufd, optval, sizeof(ufd)))
89aa0758
AS		 1088 break;
1089
1090 ret = sk_attach_bpf(ufd, sk);
1091 }
1092 break;
1093
4d295e54
CH		 1094 case SO_ATTACH_REUSEPORT_CBPF: {
1095 struct sock_fprog fprog;
538950a1 1096
c8c1bbb6 1097 ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
4d295e54 1098 if (!ret)
538950a1 1099 ret = sk_reuseport_attach_filter(&fprog, sk);
538950a1 1100 break;
4d295e54 1101 }
538950a1
CG		 1102 case SO_ATTACH_REUSEPORT_EBPF:
1103 ret = -EINVAL;
1104 if (optlen == sizeof(u32)) {
1105 u32 ufd;
1106
1107 ret = -EFAULT;
c8c1bbb6 1108 if (copy_from_sockptr(&ufd, optval, sizeof(ufd)))
538950a1
CG		 1109 break;
1110
1111 ret = sk_reuseport_attach_bpf(ufd, sk);
1112 }
1113 break;
1114
99f3a064
MKL		 1115 case SO_DETACH_REUSEPORT_BPF:
1116 ret = reuseport_detach_prog(sk);
1117 break;
1118
e71a4783 1119 case SO_DETACH_FILTER:
55b33325 1120 ret = sk_detach_filter(sk);
e71a4783 1121 break;
1da177e4 1122
d59577b6
VB		 1123 case SO_LOCK_FILTER:
1124 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
1125 ret = -EPERM;
1126 else
1127 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
1128 break;
1129
e71a4783
SH		 1130 case SO_PASSSEC:
1131 if (valbool)
1132 set_bit(SOCK_PASSSEC, &sock->flags);
1133 else
1134 clear_bit(SOCK_PASSSEC, &sock->flags);
1135 break;
4a19ec58 1136 case SO_MARK:
50254256 1137 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
4a19ec58 1138 ret = -EPERM;
50254256 1139 } else if (val != sk->sk_mark) {
4a19ec58 1140 sk->sk_mark = val;
50254256
DB		 1141 sk_dst_reset(sk);
1142 }
4a19ec58 1143 break;
877ce7c1 1144
3b885787 1145 case SO_RXQ_OVFL:
8083f0fc 1146 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 1147 break;
6e3e939f
JB		 1148
1149 case SO_WIFI_STATUS:
1150 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
1151 break;
1152
ef64a54f
PE		 1153 case SO_PEEK_OFF:
1154 if (sock->ops->set_peek_off)
12663bfc 1155 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 1156 else
1157 ret = -EOPNOTSUPP;
1158 break;
3bdc0eba
BG		 1159
1160 case SO_NOFCS:
1161 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
1162 break;
1163
7d4c04fc
KJ		 1164 case SO_SELECT_ERR_QUEUE:
1165 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
1166 break;
1167
e0d1095a 1168#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1169 case SO_BUSY_POLL:
dafcc438
ET		 1170 /* allow unprivileged users to decrease the value */
1171 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
1172 ret = -EPERM;
1173 else {
1174 if (val < 0)
1175 ret = -EINVAL;
1176 else
1177 sk->sk_ll_usec = val;
1178 }
1179 break;
1180#endif
62748f32
ED		 1181
1182 case SO_MAX_PACING_RATE:
6bdef102
ED		 1183 {
1184 unsigned long ulval = (val == ~0U) ? ~0UL : val;
1185
1186 if (sizeof(ulval) != sizeof(val) &&
1187 optlen >= sizeof(ulval) &&
c8c1bbb6 1188 copy_from_sockptr(&ulval, optval, sizeof(ulval))) {
6bdef102
ED		 1189 ret = -EFAULT;
1190 break;
1191 }
1192 if (ulval != ~0UL)
218af599
ED		 1193 cmpxchg(&sk->sk_pacing_status,
1194 SK_PACING_NONE,
1195 SK_PACING_NEEDED);
6bdef102
ED		 1196 sk->sk_max_pacing_rate = ulval;
1197 sk->sk_pacing_rate = min(sk->sk_pacing_rate, ulval);
62748f32 1198 break;
6bdef102 1199 }
70da268b 1200 case SO_INCOMING_CPU:
7170a977 1201 WRITE_ONCE(sk->sk_incoming_cpu, val);
70da268b
ED		 1202 break;
1203
a87cb3e4
TH		 1204 case SO_CNX_ADVICE:
1205 if (val == 1)
1206 dst_negative_advice(sk);
1207 break;
76851d12
WB		 1208
1209 case SO_ZEROCOPY:
28190752 1210 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) {
b5947e5d
WB		 1211 if (!((sk->sk_type == SOCK_STREAM &&
1212 sk->sk_protocol == IPPROTO_TCP) ||
1213 (sk->sk_type == SOCK_DGRAM &&
1214 sk->sk_protocol == IPPROTO_UDP)))
28190752 1215 ret = -ENOTSUPP;
28190752 1216 } else if (sk->sk_family != PF_RDS) {
76851d12 1217 ret = -ENOTSUPP;
28190752
SV		 1218 }
1219 if (!ret) {
1220 if (val < 0 || val > 1)
1221 ret = -EINVAL;
1222 else
1223 sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool);
28190752 1224 }
334e6413
JSP		 1225 break;
1226
80b14dee 1227 case SO_TXTIME:
790709f2 1228 if (optlen != sizeof(struct sock_txtime)) {
80b14dee 1229 ret = -EINVAL;
790709f2 1230 break;
c8c1bbb6 1231 } else if (copy_from_sockptr(&sk_txtime, optval,
80b14dee
RC		 1232 sizeof(struct sock_txtime))) {
1233 ret = -EFAULT;
790709f2 1234 break;
80b14dee
RC		 1235 } else if (sk_txtime.flags & ~SOF_TXTIME_FLAGS_MASK) {
1236 ret = -EINVAL;
790709f2
ED		 1237 break;
1238 }
1239 /* CLOCK_MONOTONIC is only used by sch_fq, and this packet
1240 * scheduler has enough safe guards.
1241 */
1242 if (sk_txtime.clockid != CLOCK_MONOTONIC &&
1243 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1244 ret = -EPERM;
1245 break;
80b14dee 1246 }
790709f2
ED		 1247 sock_valbool_flag(sk, SOCK_TXTIME, true);
1248 sk->sk_clockid = sk_txtime.clockid;
1249 sk->sk_txtime_deadline_mode =
1250 !!(sk_txtime.flags & SOF_TXTIME_DEADLINE_MODE);
1251 sk->sk_txtime_report_errors =
1252 !!(sk_txtime.flags & SOF_TXTIME_REPORT_ERRORS);
80b14dee
RC		 1253 break;
1254
f5dd3d0c 1255 case SO_BINDTOIFINDEX:
7594888c 1256 ret = sock_bindtoindex_locked(sk, val);
f5dd3d0c
DH		 1257 break;
1258
e71a4783
SH		 1259 default:
1260 ret = -ENOPROTOOPT;
1261 break;
4ec93edb 1262 }
1da177e4
LT		 1263 release_sock(sk);
1264 return ret;
1265}
2a91525c 1266EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 1267
1268
8f09898b 1269static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1270 struct ucred *ucred)
3f551f94
EB		 1271{
1272 ucred->pid = pid_vnr(pid);
1273 ucred->uid = ucred->gid = -1;
1274 if (cred) {
1275 struct user_namespace *current_ns = current_user_ns();
1276
b2e4f544
EB		 1277 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1278 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 1279 }
1280}
1281
28b5ba2a
DH		 1282static int groups_to_user(gid_t __user *dst, const struct group_info *src)
1283{
1284 struct user_namespace *user_ns = current_user_ns();
1285 int i;
1286
1287 for (i = 0; i < src->ngroups; i++)
1288 if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i))
1289 return -EFAULT;
1290
1291 return 0;
1292}
1293
1da177e4
LT		 1294int sock_getsockopt(struct socket *sock, int level, int optname,
1295 char __user *optval, int __user *optlen)
1296{
1297 struct sock *sk = sock->sk;
4ec93edb 1298
e71a4783 1299 union {
4ec93edb 1300 int val;
5daab9db 1301 u64 val64;
677f136c 1302 unsigned long ulval;
4ec93edb 1303 struct linger ling;
fe0c72f3
AB		 1304 struct old_timeval32 tm32;
1305 struct __kernel_old_timeval tm;
a9beb86a 1306 struct __kernel_sock_timeval stm;
80b14dee 1307 struct sock_txtime txtime;
1da177e4 1308 } v;
4ec93edb 1309
4d0392be 1310 int lv = sizeof(int);
1da177e4 1311 int len;
4ec93edb 1312
e71a4783 1313 if (get_user(len, optlen))
4ec93edb 1314 return -EFAULT;
e71a4783 1315 if (len < 0)
1da177e4 1316 return -EINVAL;
4ec93edb 1317
50fee1de 1318 memset(&v, 0, sizeof(v));
df0bca04 1319
2a91525c 1320 switch (optname) {
e71a4783
SH		 1321 case SO_DEBUG:
1322 v.val = sock_flag(sk, SOCK_DBG);
1323 break;
1324
1325 case SO_DONTROUTE:
1326 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1327 break;
1328
1329 case SO_BROADCAST:
1b23a5df 1330 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1331 break;
1332
1333 case SO_SNDBUF:
1334 v.val = sk->sk_sndbuf;
1335 break;
1336
1337 case SO_RCVBUF:
1338 v.val = sk->sk_rcvbuf;
1339 break;
1340
1341 case SO_REUSEADDR:
1342 v.val = sk->sk_reuse;
1343 break;
1344
055dc21a
TH		 1345 case SO_REUSEPORT:
1346 v.val = sk->sk_reuseport;
1347 break;
1348
e71a4783 1349 case SO_KEEPALIVE:
1b23a5df 1350 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1351 break;
1352
1353 case SO_TYPE:
1354 v.val = sk->sk_type;
1355 break;
1356
49c794e9
JE		 1357 case SO_PROTOCOL:
1358 v.val = sk->sk_protocol;
1359 break;
1360
0d6038ee
JE		 1361 case SO_DOMAIN:
1362 v.val = sk->sk_family;
1363 break;
1364
e71a4783
SH		 1365 case SO_ERROR:
1366 v.val = -sock_error(sk);
2a91525c 1367 if (v.val == 0)
e71a4783
SH		 1368 v.val = xchg(&sk->sk_err_soft, 0);
1369 break;
1370
1371 case SO_OOBINLINE:
1b23a5df 1372 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1373 break;
1374
1375 case SO_NO_CHECK:
28448b80 1376 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1377 break;
1378
1379 case SO_PRIORITY:
1380 v.val = sk->sk_priority;
1381 break;
1382
1383 case SO_LINGER:
1384 lv = sizeof(v.ling);
1b23a5df 1385 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1386 v.ling.l_linger = sk->sk_lingertime / HZ;
1387 break;
1388
1389 case SO_BSDCOMPAT:
1390 sock_warn_obsolete_bsdism("getsockopt");
1391 break;
1392
7f1bc6e9 1393 case SO_TIMESTAMP_OLD:
92f37fd2 1394 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
887feae3 1395 !sock_flag(sk, SOCK_TSTAMP_NEW) &&
92f37fd2
ED		 1396 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1397 break;
1398
7f1bc6e9 1399 case SO_TIMESTAMPNS_OLD:
887feae3
DD		 1400 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && !sock_flag(sk, SOCK_TSTAMP_NEW);
1401 break;
1402
1403 case SO_TIMESTAMP_NEW:
1404 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && sock_flag(sk, SOCK_TSTAMP_NEW);
1405 break;
1406
1407 case SO_TIMESTAMPNS_NEW:
1408 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && sock_flag(sk, SOCK_TSTAMP_NEW);
e71a4783
SH		 1409 break;
1410
7f1bc6e9 1411 case SO_TIMESTAMPING_OLD:
b9f40e21 1412 v.val = sk->sk_tsflags;
20d49473
PO		 1413 break;
1414
a9beb86a
DD		 1415 case SO_RCVTIMEO_OLD:
1416 case SO_RCVTIMEO_NEW:
1417 lv = sock_get_timeout(sk->sk_rcvtimeo, &v, SO_RCVTIMEO_OLD == optname);
e71a4783
SH		 1418 break;
1419
a9beb86a
DD		 1420 case SO_SNDTIMEO_OLD:
1421 case SO_SNDTIMEO_NEW:
1422 lv = sock_get_timeout(sk->sk_sndtimeo, &v, SO_SNDTIMEO_OLD == optname);
e71a4783 1423 break;
1da177e4 1424
e71a4783
SH		 1425 case SO_RCVLOWAT:
1426 v.val = sk->sk_rcvlowat;
1427 break;
1da177e4 1428
e71a4783 1429 case SO_SNDLOWAT:
2a91525c 1430 v.val = 1;
e71a4783 1431 break;
1da177e4 1432
e71a4783 1433 case SO_PASSCRED:
82981930 1434 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1435 break;
1da177e4 1436
e71a4783 1437 case SO_PEERCRED:
109f6e39
EB		 1438 {
1439 struct ucred peercred;
1440 if (len > sizeof(peercred))
1441 len = sizeof(peercred);
1442 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1443 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1444 return -EFAULT;
1445 goto lenout;
109f6e39 1446 }
1da177e4 1447
28b5ba2a
DH		 1448 case SO_PEERGROUPS:
1449 {
1450 int ret, n;
1451
1452 if (!sk->sk_peer_cred)
1453 return -ENODATA;
1454
1455 n = sk->sk_peer_cred->group_info->ngroups;
1456 if (len < n * sizeof(gid_t)) {
1457 len = n * sizeof(gid_t);
1458 return put_user(len, optlen) ? -EFAULT : -ERANGE;
1459 }
1460 len = n * sizeof(gid_t);
1461
1462 ret = groups_to_user((gid_t __user *)optval,
1463 sk->sk_peer_cred->group_info);
1464 if (ret)
1465 return ret;
1466 goto lenout;
1467 }
1468
e71a4783
SH		 1469 case SO_PEERNAME:
1470 {
1471 char address[128];
1472
9b2c45d4
DV		 1473 lv = sock->ops->getname(sock, (struct sockaddr *)address, 2);
1474 if (lv < 0)
e71a4783
SH		 1475 return -ENOTCONN;
1476 if (lv < len)
1477 return -EINVAL;
1478 if (copy_to_user(optval, address, len))
1479 return -EFAULT;
1480 goto lenout;
1481 }
1da177e4 1482
e71a4783
SH		 1483 /* Dubious BSD thing... Probably nobody even uses it, but
1484 * the UNIX standard wants it for whatever reason... -DaveM
1485 */
1486 case SO_ACCEPTCONN:
1487 v.val = sk->sk_state == TCP_LISTEN;
1488 break;
1da177e4 1489
e71a4783 1490 case SO_PASSSEC:
82981930 1491 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1492 break;
877ce7c1 1493
e71a4783
SH		 1494 case SO_PEERSEC:
1495 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1496
4a19ec58
LAT		 1497 case SO_MARK:
1498 v.val = sk->sk_mark;
1499 break;
1500
3b885787 1501 case SO_RXQ_OVFL:
1b23a5df 1502 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1503 break;
1504
6e3e939f 1505 case SO_WIFI_STATUS:
1b23a5df 1506 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1507 break;
1508
ef64a54f
PE		 1509 case SO_PEEK_OFF:
1510 if (!sock->ops->set_peek_off)
1511 return -EOPNOTSUPP;
1512
1513 v.val = sk->sk_peek_off;
1514 break;
bc2f7996 1515 case SO_NOFCS:
1b23a5df 1516 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1517 break;
c91f6df2 1518
f7b86bfe 1519 case SO_BINDTODEVICE:
c91f6df2
BH		 1520 return sock_getbindtodevice(sk, optval, optlen, len);
1521
a8fc9277
PE		 1522 case SO_GET_FILTER:
1523 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1524 if (len < 0)
1525 return len;
1526
1527 goto lenout;
c91f6df2 1528
d59577b6
VB		 1529 case SO_LOCK_FILTER:
1530 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1531 break;
1532
ea02f941
MS		 1533 case SO_BPF_EXTENSIONS:
1534 v.val = bpf_tell_extensions();
1535 break;
1536
7d4c04fc
KJ		 1537 case SO_SELECT_ERR_QUEUE:
1538 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1539 break;
1540
e0d1095a 1541#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1542 case SO_BUSY_POLL:
dafcc438
ET		 1543 v.val = sk->sk_ll_usec;
1544 break;
1545#endif
1546
62748f32 1547 case SO_MAX_PACING_RATE:
677f136c
ED		 1548 if (sizeof(v.ulval) != sizeof(v.val) && len >= sizeof(v.ulval)) {
1549 lv = sizeof(v.ulval);
1550 v.ulval = sk->sk_max_pacing_rate;
1551 } else {
1552 /* 32bit version */
1553 v.val = min_t(unsigned long, sk->sk_max_pacing_rate, ~0U);
1554 }
62748f32
ED		 1555 break;
1556
2c8c56e1 1557 case SO_INCOMING_CPU:
7170a977 1558 v.val = READ_ONCE(sk->sk_incoming_cpu);
2c8c56e1
ED		 1559 break;
1560
a2d133b1
JH		 1561 case SO_MEMINFO:
1562 {
1563 u32 meminfo[SK_MEMINFO_VARS];
1564
a2d133b1
JH		 1565 sk_get_meminfo(sk, meminfo);
1566
1567 len = min_t(unsigned int, len, sizeof(meminfo));
1568 if (copy_to_user(optval, &meminfo, len))
1569 return -EFAULT;
1570
1571 goto lenout;
1572 }
6d433902
SS		 1573
1574#ifdef CONFIG_NET_RX_BUSY_POLL
1575 case SO_INCOMING_NAPI_ID:
1576 v.val = READ_ONCE(sk->sk_napi_id);
1577
1578 /* aggregate non-NAPI IDs down to 0 */
1579 if (v.val < MIN_NAPI_ID)
1580 v.val = 0;
1581
1582 break;
1583#endif
1584
5daab9db
CF		 1585 case SO_COOKIE:
1586 lv = sizeof(u64);
1587 if (len < lv)
1588 return -EINVAL;
1589 v.val64 = sock_gen_cookie(sk);
1590 break;
1591
76851d12
WB		 1592 case SO_ZEROCOPY:
1593 v.val = sock_flag(sk, SOCK_ZEROCOPY);
1594 break;
1595
80b14dee
RC		 1596 case SO_TXTIME:
1597 lv = sizeof(v.txtime);
1598 v.txtime.clockid = sk->sk_clockid;
1599 v.txtime.flags |= sk->sk_txtime_deadline_mode ?
1600 SOF_TXTIME_DEADLINE_MODE : 0;
4b15c707
JSP		 1601 v.txtime.flags |= sk->sk_txtime_report_errors ?
1602 SOF_TXTIME_REPORT_ERRORS : 0;
80b14dee
RC		 1603 break;
1604
f5dd3d0c
DH		 1605 case SO_BINDTOIFINDEX:
1606 v.val = sk->sk_bound_dev_if;
1607 break;
1608
e71a4783 1609 default:
443b5991
YH		 1610 /* We implement the SO_SNDLOWAT etc to not be settable
1611 * (1003.1g 7).
1612 */
e71a4783 1613 return -ENOPROTOOPT;
1da177e4 1614 }
e71a4783 1615
1da177e4
LT		 1616 if (len > lv)
1617 len = lv;
1618 if (copy_to_user(optval, &v, len))
1619 return -EFAULT;
1620lenout:
4ec93edb
YH		 1621 if (put_user(len, optlen))
1622 return -EFAULT;
1623 return 0;
1da177e4
LT		 1624}
1625
a5b5bb9a
IM		 1626/*
1627 * Initialize an sk_lock.
1628 *
1629 * (We also register the sk_lock with the lock validator.)
1630 */
b6f99a21 1631static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1632{
cdfbabfb
DH		 1633 if (sk->sk_kern_sock)
1634 sock_lock_init_class_and_name(
1635 sk,
1636 af_family_kern_slock_key_strings[sk->sk_family],
1637 af_family_kern_slock_keys + sk->sk_family,
1638 af_family_kern_key_strings[sk->sk_family],
1639 af_family_kern_keys + sk->sk_family);
1640 else
1641 sock_lock_init_class_and_name(
1642 sk,
ed07536e
PZ		 1643 af_family_slock_key_strings[sk->sk_family],
1644 af_family_slock_keys + sk->sk_family,
1645 af_family_key_strings[sk->sk_family],
1646 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1647}
1648
4dc6dc71
ED		 1649/*
1650 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1651 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1652 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1653 */
f1a6c4da
PE		 1654static void sock_copy(struct sock *nsk, const struct sock *osk)
1655{
b8e202d1 1656 const struct proto *prot = READ_ONCE(osk->sk_prot);
f1a6c4da
PE		 1657#ifdef CONFIG_SECURITY_NETWORK
1658 void *sptr = nsk->sk_security;
1659#endif
68835aba
ED		 1660 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1661
1662 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
b8e202d1 1663 prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
68835aba 1664
f1a6c4da
PE		 1665#ifdef CONFIG_SECURITY_NETWORK
1666 nsk->sk_security = sptr;
1667 security_sk_clone(osk, nsk);
1668#endif
1669}
1670
2e4afe7b
PE		 1671static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1672 int family)
c308c1b2
PE		 1673{
1674 struct sock *sk;
1675 struct kmem_cache *slab;
1676
1677 slab = prot->slab;
e912b114
ED		 1678 if (slab != NULL) {
1679 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1680 if (!sk)
1681 return sk;
6471384a 1682 if (want_init_on_alloc(priority))
ba2489b0 1683 sk_prot_clear_nulls(sk, prot->obj_size);
fcbdf09d 1684 } else
c308c1b2
PE		 1685 sk = kmalloc(prot->obj_size, priority);
1686
2e4afe7b
PE		 1687 if (sk != NULL) {
1688 if (security_sk_alloc(sk, family, priority))
1689 goto out_free;
1690
1691 if (!try_module_get(prot->owner))
1692 goto out_free_sec;
e022f0b4 1693 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1694 }
1695
c308c1b2 1696 return sk;
2e4afe7b
PE		 1697
1698out_free_sec:
1699 security_sk_free(sk);
1700out_free:
1701 if (slab != NULL)
1702 kmem_cache_free(slab, sk);
1703 else
1704 kfree(sk);
1705 return NULL;
c308c1b2
PE		 1706}
1707
1708static void sk_prot_free(struct proto *prot, struct sock *sk)
1709{
1710 struct kmem_cache *slab;
2e4afe7b 1711 struct module *owner;
c308c1b2 1712
2e4afe7b 1713 owner = prot->owner;
c308c1b2 1714 slab = prot->slab;
2e4afe7b 1715
bd1060a1 1716 cgroup_sk_free(&sk->sk_cgrp_data);
2d758073 1717 mem_cgroup_sk_free(sk);
2e4afe7b 1718 security_sk_free(sk);
c308c1b2
PE		 1719 if (slab != NULL)
1720 kmem_cache_free(slab, sk);
1721 else
1722 kfree(sk);
2e4afe7b 1723 module_put(owner);
c308c1b2
PE		 1724}
1725
1da177e4
LT		 1726/**
1727 * sk_alloc - All socket objects are allocated here
c4ea43c5 1728 * @net: the applicable net namespace
4dc3b16b
PP		 1729 * @family: protocol family
1730 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1731 * @prot: struct proto associated with this new sock instance
11aa9c28 1732 * @kern: is this to be a kernel socket?
1da177e4 1733 */
1b8d7ae4 1734struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
11aa9c28 1735 struct proto *prot, int kern)
1da177e4 1736{
c308c1b2 1737 struct sock *sk;
1da177e4 1738
154adbc8 1739 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1740 if (sk) {
154adbc8
PE		 1741 sk->sk_family = family;
1742 /*
1743 * See comment in struct sock definition to understand
1744 * why we need sk_prot_creator -acme
1745 */
1746 sk->sk_prot = sk->sk_prot_creator = prot;
cdfbabfb 1747 sk->sk_kern_sock = kern;
154adbc8 1748 sock_lock_init(sk);
26abe143 1749 sk->sk_net_refcnt = kern ? 0 : 1;
648845ab 1750 if (likely(sk->sk_net_refcnt)) {
26abe143 1751 get_net(net);
648845ab
TZ		 1752 sock_inuse_add(net, 1);
1753 }
1754
26abe143 1755 sock_net_set(sk, net);
14afee4b 1756 refcount_set(&sk->sk_wmem_alloc, 1);
f8451725 1757
2d758073 1758 mem_cgroup_sk_alloc(sk);
d979a39d 1759 cgroup_sk_alloc(&sk->sk_cgrp_data);
2a56a1fe
TH		 1760 sock_update_classid(&sk->sk_cgrp_data);
1761 sock_update_netprioidx(&sk->sk_cgrp_data);
41b14fb8 1762 sk_tx_queue_clear(sk);
1da177e4 1763 }
a79af59e 1764
2e4afe7b 1765 return sk;
1da177e4 1766}
2a91525c 1767EXPORT_SYMBOL(sk_alloc);
1da177e4 1768
a4298e45
ED		 1769/* Sockets having SOCK_RCU_FREE will call this function after one RCU
1770 * grace period. This is the case for UDP sockets and TCP listeners.
1771 */
1772static void __sk_destruct(struct rcu_head *head)
1da177e4 1773{
a4298e45 1774 struct sock *sk = container_of(head, struct sock, sk_rcu);
1da177e4 1775 struct sk_filter *filter;
1da177e4
LT		 1776
1777 if (sk->sk_destruct)
1778 sk->sk_destruct(sk);
1779
a898def2 1780 filter = rcu_dereference_check(sk->sk_filter,
14afee4b 1781 refcount_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1782 if (filter) {
309dd5fc 1783 sk_filter_uncharge(sk, filter);
a9b3cd7f 1784 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1785 }
1786
08e29af3 1787 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4 1788
6ac99e8f
MKL		 1789#ifdef CONFIG_BPF_SYSCALL
1790 bpf_sk_storage_free(sk);
1791#endif
1792
1da177e4 1793 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1794 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1795 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1796
22a0e18e
ED		 1797 if (sk->sk_frag.page) {
1798 put_page(sk->sk_frag.page);
1799 sk->sk_frag.page = NULL;
1800 }
1801
109f6e39
EB		 1802 if (sk->sk_peer_cred)
1803 put_cred(sk->sk_peer_cred);
1804 put_pid(sk->sk_peer_pid);
26abe143
EB		 1805 if (likely(sk->sk_net_refcnt))
1806 put_net(sock_net(sk));
c308c1b2 1807 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1808}
2b85a34e 1809
a4298e45
ED		 1810void sk_destruct(struct sock *sk)
1811{
8c7138b3
MKL		 1812 bool use_call_rcu = sock_flag(sk, SOCK_RCU_FREE);
1813
1814 if (rcu_access_pointer(sk->sk_reuseport_cb)) {
1815 reuseport_detach_sock(sk);
1816 use_call_rcu = true;
1817 }
1818
1819 if (use_call_rcu)
a4298e45
ED		 1820 call_rcu(&sk->sk_rcu, __sk_destruct);
1821 else
1822 __sk_destruct(&sk->sk_rcu);
1823}
1824
eb4cb008
CG		 1825static void __sk_free(struct sock *sk)
1826{
648845ab
TZ		 1827 if (likely(sk->sk_net_refcnt))
1828 sock_inuse_add(sock_net(sk), -1);
1829
9709020c 1830 if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk)))
eb4cb008
CG		 1831 sock_diag_broadcast_destroy(sk);
1832 else
1833 sk_destruct(sk);
1834}
1835
2b85a34e
ED		 1836void sk_free(struct sock *sk)
1837{
1838 /*
25985edc 1839 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1840 * some packets are still in some tx queue.
1841 * If not null, sock_wfree() will call __sk_free(sk) later
1842 */
14afee4b 1843 if (refcount_dec_and_test(&sk->sk_wmem_alloc))
2b85a34e
ED		 1844 __sk_free(sk);
1845}
2a91525c 1846EXPORT_SYMBOL(sk_free);
1da177e4 1847
581319c5
PA		 1848static void sk_init_common(struct sock *sk)
1849{
1850 skb_queue_head_init(&sk->sk_receive_queue);
1851 skb_queue_head_init(&sk->sk_write_queue);
1852 skb_queue_head_init(&sk->sk_error_queue);
1853
1854 rwlock_init(&sk->sk_callback_lock);
1855 lockdep_set_class_and_name(&sk->sk_receive_queue.lock,
1856 af_rlock_keys + sk->sk_family,
1857 af_family_rlock_key_strings[sk->sk_family]);
1858 lockdep_set_class_and_name(&sk->sk_write_queue.lock,
1859 af_wlock_keys + sk->sk_family,
1860 af_family_wlock_key_strings[sk->sk_family]);
1861 lockdep_set_class_and_name(&sk->sk_error_queue.lock,
1862 af_elock_keys + sk->sk_family,
1863 af_family_elock_key_strings[sk->sk_family]);
1864 lockdep_set_class_and_name(&sk->sk_callback_lock,
1865 af_callback_keys + sk->sk_family,
1866 af_family_clock_key_strings[sk->sk_family]);
1867}
1868
e56c57d0
ED		 1869/**
1870 * sk_clone_lock - clone a socket, and lock its clone
1871 * @sk: the socket to clone
1872 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1873 *
1874 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1875 */
1876struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1877{
b8e202d1 1878 struct proto *prot = READ_ONCE(sk->sk_prot);
8fd1d178 1879 struct sock *newsk;
278571ba 1880 bool is_charged = true;
87d11ceb 1881
b8e202d1 1882 newsk = sk_prot_alloc(prot, priority, sk->sk_family);
87d11ceb
ACM		 1883 if (newsk != NULL) {
1884 struct sk_filter *filter;
1885
892c141e 1886 sock_copy(newsk, sk);
87d11ceb 1887
b8e202d1 1888 newsk->sk_prot_creator = prot;
9d538fa6 1889
87d11ceb 1890 /* SANITY */
8a681736
SV		 1891 if (likely(newsk->sk_net_refcnt))
1892 get_net(sock_net(newsk));
87d11ceb
ACM		 1893 sk_node_init(&newsk->sk_node);
1894 sock_lock_init(newsk);
1895 bh_lock_sock(newsk);
fa438ccf 1896 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1897 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1898
1899 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1900 /*
1901 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1902 */
14afee4b 1903 refcount_set(&newsk->sk_wmem_alloc, 1);
87d11ceb 1904 atomic_set(&newsk->sk_omem_alloc, 0);
581319c5 1905 sk_init_common(newsk);
87d11ceb
ACM		 1906
1907 newsk->sk_dst_cache = NULL;
9b8805a3 1908 newsk->sk_dst_pending_confirm = 0;
87d11ceb
ACM		 1909 newsk->sk_wmem_queued = 0;
1910 newsk->sk_forward_alloc = 0;
9caad864 1911 atomic_set(&newsk->sk_drops, 0);
87d11ceb 1912 newsk->sk_send_head = NULL;
87d11ceb 1913 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
52267790 1914 atomic_set(&newsk->sk_zckey, 0);
87d11ceb
ACM		 1915
1916 sock_reset_flag(newsk, SOCK_DONE);
d752a498
SB		 1917
1918 /* sk->sk_memcg will be populated at accept() time */
1919 newsk->sk_memcg = NULL;
1920
ad0f75e5 1921 cgroup_sk_clone(&newsk->sk_cgrp_data);
87d11ceb 1922
eefca20e
ED		 1923 rcu_read_lock();
1924 filter = rcu_dereference(sk->sk_filter);
87d11ceb 1925 if (filter != NULL)
278571ba
AS		 1926 /* though it's an empty new sock, the charging may fail
1927 * if sysctl_optmem_max was changed between creation of
1928 * original socket and cloning
1929 */
1930 is_charged = sk_filter_charge(newsk, filter);
eefca20e
ED		 1931 RCU_INIT_POINTER(newsk->sk_filter, filter);
1932 rcu_read_unlock();
87d11ceb 1933
d188ba86 1934 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
a97e50cc
DB		 1935 /* We need to make sure that we don't uncharge the new
1936 * socket if we couldn't charge it in the first place
1937 * as otherwise we uncharge the parent's filter.
1938 */
1939 if (!is_charged)
1940 RCU_INIT_POINTER(newsk->sk_filter, NULL);
94352d45 1941 sk_free_unlock_clone(newsk);
87d11ceb
ACM		 1942 newsk = NULL;
1943 goto out;
1944 }
fa463497 1945 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
8f51dfc7
SF		 1946
1947 if (bpf_sk_storage_clone(sk, newsk)) {
1948 sk_free_unlock_clone(newsk);
1949 newsk = NULL;
1950 goto out;
1951 }
87d11ceb 1952
f1ff5ce2
JS		 1953 /* Clear sk_user_data if parent had the pointer tagged
1954 * as not suitable for copying when cloning.
1955 */
1956 if (sk_user_data_is_nocopy(newsk))
7a1ca972 1957 newsk->sk_user_data = NULL;
f1ff5ce2 1958
87d11ceb 1959 newsk->sk_err = 0;
e551c32d 1960 newsk->sk_err_soft = 0;
87d11ceb 1961 newsk->sk_priority = 0;
2c8c56e1 1962 newsk->sk_incoming_cpu = raw_smp_processor_id();
648845ab
TZ		 1963 if (likely(newsk->sk_net_refcnt))
1964 sock_inuse_add(sock_net(newsk), 1);
d979a39d 1965
4dc6dc71
ED		 1966 /*
1967 * Before updating sk_refcnt, we must commit prior changes to memory
2cdb54c9 1968 * (Documentation/RCU/rculist_nulls.rst for details)
4dc6dc71
ED		 1969 */
1970 smp_wmb();
41c6d650 1971 refcount_set(&newsk->sk_refcnt, 2);
87d11ceb
ACM		 1972
1973 /*
1974 * Increment the counter in the same struct proto as the master
1975 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1976 * is the same as sk->sk_prot->socks, as this field was copied
1977 * with memcpy).
1978 *
1979 * This _changes_ the previous behaviour, where
1980 * tcp_create_openreq_child always was incrementing the
1981 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1982 * to be taken into account in all callers. -acme
1983 */
1984 sk_refcnt_debug_inc(newsk);
972692e0 1985 sk_set_socket(newsk, NULL);
41b14fb8 1986 sk_tx_queue_clear(newsk);
c2f26e8f 1987 RCU_INIT_POINTER(newsk->sk_wq, NULL);
87d11ceb
ACM		 1988
1989 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1990 sk_sockets_allocated_inc(newsk);
704da560 1991
080a270f
HFS		 1992 if (sock_needs_netstamp(sk) &&
1993 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1994 net_enable_timestamp();
87d11ceb
ACM		 1995 }
1996out:
1997 return newsk;
1998}
e56c57d0 1999EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 2000
94352d45
ACM		 2001void sk_free_unlock_clone(struct sock *sk)
2002{
2003 /* It is still raw copy of parent, so invalidate
2004 * destructor and make plain sk_free() */
2005 sk->sk_destruct = NULL;
2006 bh_unlock_sock(sk);
2007 sk_free(sk);
2008}
2009EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
2010
9958089a
AK		 2011void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
2012{
d6a4e26a
ED		 2013 u32 max_segs = 1;
2014
6bd4f355 2015 sk_dst_set(sk, dst);
0a6b2a1d 2016 sk->sk_route_caps = dst->dev->features | sk->sk_route_forced_caps;
9958089a 2017 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 2018 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 2019 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 2020 if (sk_can_gso(sk)) {
f70f250a 2021 if (dst->header_len && !xfrm_dst_offload_ok(dst)) {
9958089a 2022 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 2023 } else {
9958089a 2024 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 2025 sk->sk_gso_max_size = dst->dev->gso_max_size;
d6a4e26a 2026 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
82cc1a7a 2027 }
9958089a 2028 }
d6a4e26a 2029 sk->sk_gso_max_segs = max_segs;
9958089a
AK		 2030}
2031EXPORT_SYMBOL_GPL(sk_setup_caps);
2032
1da177e4
LT		 2033/*
2034 * Simple resource managers for sockets.
2035 */
2036
2037
4ec93edb
YH		 2038/*
2039 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 2040 */
2041void sock_wfree(struct sk_buff *skb)
2042{
2043 struct sock *sk = skb->sk;
d99927f4 2044 unsigned int len = skb->truesize;
1da177e4 2045
d99927f4
ED		 2046 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
2047 /*
2048 * Keep a reference on sk_wmem_alloc, this will be released
2049 * after sk_write_space() call
2050 */
14afee4b 2051 WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc));
1da177e4 2052 sk->sk_write_space(sk);
d99927f4
ED		 2053 len = 1;
2054 }
2b85a34e 2055 /*
d99927f4
ED		 2056 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
2057 * could not do because of in-flight packets
2b85a34e 2058 */
14afee4b 2059 if (refcount_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 2060 __sk_free(sk);
1da177e4 2061}
2a91525c 2062EXPORT_SYMBOL(sock_wfree);
1da177e4 2063
1d2077ac
ED		 2064/* This variant of sock_wfree() is used by TCP,
2065 * since it sets SOCK_USE_WRITE_QUEUE.
2066 */
2067void __sock_wfree(struct sk_buff *skb)
2068{
2069 struct sock *sk = skb->sk;
2070
14afee4b 2071 if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
1d2077ac
ED		 2072 __sk_free(sk);
2073}
2074
9e17f8a4
ED		 2075void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
2076{
2077 skb_orphan(skb);
2078 skb->sk = sk;
2079#ifdef CONFIG_INET
2080 if (unlikely(!sk_fullsock(sk))) {
2081 skb->destructor = sock_edemux;
2082 sock_hold(sk);
2083 return;
2084 }
2085#endif
2086 skb->destructor = sock_wfree;
2087 skb_set_hash_from_sk(skb, sk);
2088 /*
2089 * We used to take a refcount on sk, but following operation
2090 * is enough to guarantee sk_free() wont free this sock until
2091 * all in-flight packets are completed
2092 */
14afee4b 2093 refcount_add(skb->truesize, &sk->sk_wmem_alloc);
9e17f8a4
ED		 2094}
2095EXPORT_SYMBOL(skb_set_owner_w);
2096
41477662
JK		 2097static bool can_skb_orphan_partial(const struct sk_buff *skb)
2098{
2099#ifdef CONFIG_TLS_DEVICE
2100 /* Drivers depend on in-order delivery for crypto offload,
2101 * partial orphan breaks out-of-order-OK logic.
2102 */
2103 if (skb->decrypted)
2104 return false;
2105#endif
2106 return (skb->destructor == sock_wfree ||
2107 (IS_ENABLED(CONFIG_INET) && skb->destructor == tcp_wfree));
2108}
2109
1d2077ac
ED		 2110/* This helper is used by netem, as it can hold packets in its
2111 * delay queue. We want to allow the owner socket to send more
2112 * packets, as if they were already TX completed by a typical driver.
2113 * But we also want to keep skb->sk set because some packet schedulers
f6ba8d33 2114 * rely on it (sch_fq for example).
1d2077ac 2115 */
f2f872f9
ED		 2116void skb_orphan_partial(struct sk_buff *skb)
2117{
f6ba8d33 2118 if (skb_is_tcp_pure_ack(skb))
1d2077ac
ED		 2119 return;
2120
41477662 2121 if (can_skb_orphan_partial(skb)) {
f6ba8d33
ED		 2122 struct sock *sk = skb->sk;
2123
41c6d650 2124 if (refcount_inc_not_zero(&sk->sk_refcnt)) {
14afee4b 2125 WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc));
f6ba8d33
ED		 2126 skb->destructor = sock_efree;
2127 }
f2f872f9
ED		 2128 } else {
2129 skb_orphan(skb);
2130 }
2131}
2132EXPORT_SYMBOL(skb_orphan_partial);
2133
4ec93edb
YH		 2134/*
2135 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 2136 */
2137void sock_rfree(struct sk_buff *skb)
2138{
2139 struct sock *sk = skb->sk;
d361fd59 2140 unsigned int len = skb->truesize;
1da177e4 2141
d361fd59
ED		 2142 atomic_sub(len, &sk->sk_rmem_alloc);
2143 sk_mem_uncharge(sk, len);
1da177e4 2144}
2a91525c 2145EXPORT_SYMBOL(sock_rfree);
1da177e4 2146
7768eed8
OH		 2147/*
2148 * Buffer destructor for skbs that are not used directly in read or write
2149 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
2150 */
62bccb8c
AD		 2151void sock_efree(struct sk_buff *skb)
2152{
2153 sock_put(skb->sk);
2154}
2155EXPORT_SYMBOL(sock_efree);
2156
cf7fbe66
JS		 2157/* Buffer destructor for prefetch/receive path where reference count may
2158 * not be held, e.g. for listen sockets.
2159 */
2160#ifdef CONFIG_INET
2161void sock_pfree(struct sk_buff *skb)
2162{
7ae215d2
JS		 2163 if (sk_is_refcounted(skb->sk))
2164 sock_gen_put(skb->sk);
cf7fbe66
JS		 2165}
2166EXPORT_SYMBOL(sock_pfree);
2167#endif /* CONFIG_INET */
2168
976d0201 2169kuid_t sock_i_uid(struct sock *sk)
1da177e4 2170{
976d0201 2171 kuid_t uid;
1da177e4 2172
f064af1e 2173 read_lock_bh(&sk->sk_callback_lock);
976d0201 2174 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 2175 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 2176 return uid;
2177}
2a91525c 2178EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 2179
2180unsigned long sock_i_ino(struct sock *sk)
2181{
2182 unsigned long ino;
2183
f064af1e 2184 read_lock_bh(&sk->sk_callback_lock);
1da177e4 2185 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 2186 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 2187 return ino;
2188}
2a91525c 2189EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 2190
2191/*
2192 * Allocate a skb from the socket's send buffer.
2193 */
86a76caf 2194struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 2195 gfp_t priority)
1da177e4 2196{
e292f05e
ED		 2197 if (force ||
2198 refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf)) {
2a91525c 2199 struct sk_buff *skb = alloc_skb(size, priority);
e292f05e 2200
1da177e4
LT		 2201 if (skb) {
2202 skb_set_owner_w(skb, sk);
2203 return skb;
2204 }
2205 }
2206 return NULL;
2207}
2a91525c 2208EXPORT_SYMBOL(sock_wmalloc);
1da177e4 2209
98ba0bd5
WB		 2210static void sock_ofree(struct sk_buff *skb)
2211{
2212 struct sock *sk = skb->sk;
2213
2214 atomic_sub(skb->truesize, &sk->sk_omem_alloc);
2215}
2216
2217struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size,
2218 gfp_t priority)
2219{
2220 struct sk_buff *skb;
2221
2222 /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */
2223 if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) >
2224 sysctl_optmem_max)
2225 return NULL;
2226
2227 skb = alloc_skb(size, priority);
2228 if (!skb)
2229 return NULL;
2230
2231 atomic_add(skb->truesize, &sk->sk_omem_alloc);
2232 skb->sk = sk;
2233 skb->destructor = sock_ofree;
2234 return skb;
2235}
2236
4ec93edb 2237/*
1da177e4 2238 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 2239 */
dd0fc66f 2240void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 2241{
95c96174 2242 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 2243 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
2244 void *mem;
2245 /* First do the add, to avoid the race if kmalloc
4ec93edb 2246 * might sleep.
1da177e4
LT		 2247 */
2248 atomic_add(size, &sk->sk_omem_alloc);
2249 mem = kmalloc(size, priority);
2250 if (mem)
2251 return mem;
2252 atomic_sub(size, &sk->sk_omem_alloc);
2253 }
2254 return NULL;
2255}
2a91525c 2256EXPORT_SYMBOL(sock_kmalloc);
1da177e4 2257
79e88659
DB		 2258/* Free an option memory block. Note, we actually want the inline
2259 * here as this allows gcc to detect the nullify and fold away the
2260 * condition entirely.
1da177e4 2261 */
79e88659
DB		 2262static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
2263 const bool nullify)
1da177e4 2264{
e53da5fb
DM		 2265 if (WARN_ON_ONCE(!mem))
2266 return;
79e88659 2267 if (nullify)
453431a5 2268 kfree_sensitive(mem);
79e88659
DB		 2269 else
2270 kfree(mem);
1da177e4
LT		 2271 atomic_sub(size, &sk->sk_omem_alloc);
2272}
79e88659
DB		 2273
2274void sock_kfree_s(struct sock *sk, void *mem, int size)
2275{
2276 __sock_kfree_s(sk, mem, size, false);
2277}
2a91525c 2278EXPORT_SYMBOL(sock_kfree_s);
1da177e4 2279
79e88659
DB		 2280void sock_kzfree_s(struct sock *sk, void *mem, int size)
2281{
2282 __sock_kfree_s(sk, mem, size, true);
2283}
2284EXPORT_SYMBOL(sock_kzfree_s);
2285
1da177e4
LT		 2286/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
2287 I think, these locks should be removed for datagram sockets.
2288 */
2a91525c 2289static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 2290{
2291 DEFINE_WAIT(wait);
2292
9cd3e072 2293 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1da177e4
LT		 2294 for (;;) {
2295 if (!timeo)
2296 break;
2297 if (signal_pending(current))
2298 break;
2299 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 2300 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
e292f05e 2301 if (refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf))
1da177e4
LT		 2302 break;
2303 if (sk->sk_shutdown & SEND_SHUTDOWN)
2304 break;
2305 if (sk->sk_err)
2306 break;
2307 timeo = schedule_timeout(timeo);
2308 }
aa395145 2309 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 2310 return timeo;
2311}
2312
2313
2314/*
2315 * Generic send/receive buffer handlers
2316 */
2317
4cc7f68d
HX		 2318struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
2319 unsigned long data_len, int noblock,
28d64271 2320 int *errcode, int max_page_order)
1da177e4 2321{
2e4e4410 2322 struct sk_buff *skb;
1da177e4
LT		 2323 long timeo;
2324 int err;
2325
1da177e4 2326 timeo = sock_sndtimeo(sk, noblock);
2e4e4410 2327 for (;;) {
1da177e4
LT		 2328 err = sock_error(sk);
2329 if (err != 0)
2330 goto failure;
2331
2332 err = -EPIPE;
2333 if (sk->sk_shutdown & SEND_SHUTDOWN)
2334 goto failure;
2335
e292f05e 2336 if (sk_wmem_alloc_get(sk) < READ_ONCE(sk->sk_sndbuf))
2e4e4410 2337 break;
28d64271 2338
9cd3e072 2339 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2e4e4410
ED		 2340 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2341 err = -EAGAIN;
2342 if (!timeo)
1da177e4 2343 goto failure;
2e4e4410
ED		 2344 if (signal_pending(current))
2345 goto interrupted;
2346 timeo = sock_wait_for_wmem(sk, timeo);
1da177e4 2347 }
2e4e4410
ED		 2348 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
2349 errcode, sk->sk_allocation);
2350 if (skb)
2351 skb_set_owner_w(skb, sk);
1da177e4
LT		 2352 return skb;
2353
2354interrupted:
2355 err = sock_intr_errno(timeo);
2356failure:
2357 *errcode = err;
2358 return NULL;
2359}
4cc7f68d 2360EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 2361
4ec93edb 2362struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 2363 int noblock, int *errcode)
2364{
28d64271 2365 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 2366}
2a91525c 2367EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 2368
39771b12
WB		 2369int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
2370 struct sockcm_cookie *sockc)
2371{
3dd17e63
SHY		 2372 u32 tsflags;
2373
39771b12
WB		 2374 switch (cmsg->cmsg_type) {
2375 case SO_MARK:
2376 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2377 return -EPERM;
2378 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2379 return -EINVAL;
2380 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
2381 break;
7f1bc6e9 2382 case SO_TIMESTAMPING_OLD:
3dd17e63
SHY		 2383 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2384 return -EINVAL;
2385
2386 tsflags = *(u32 *)CMSG_DATA(cmsg);
2387 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
2388 return -EINVAL;
2389
2390 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
2391 sockc->tsflags |= tsflags;
2392 break;
80b14dee
RC		 2393 case SCM_TXTIME:
2394 if (!sock_flag(sk, SOCK_TXTIME))
2395 return -EINVAL;
2396 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u64)))
2397 return -EINVAL;
2398 sockc->transmit_time = get_unaligned((u64 *)CMSG_DATA(cmsg));
2399 break;
779f1ede
SHY		 2400 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
2401 case SCM_RIGHTS:
2402 case SCM_CREDENTIALS:
2403 break;
39771b12
WB		 2404 default:
2405 return -EINVAL;
2406 }
2407 return 0;
2408}
2409EXPORT_SYMBOL(__sock_cmsg_send);
2410
f28ea365
EJ		 2411int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
2412 struct sockcm_cookie *sockc)
2413{
2414 struct cmsghdr *cmsg;
39771b12 2415 int ret;
f28ea365
EJ		 2416
2417 for_each_cmsghdr(cmsg, msg) {
2418 if (!CMSG_OK(msg, cmsg))
2419 return -EINVAL;
2420 if (cmsg->cmsg_level != SOL_SOCKET)
2421 continue;
39771b12
WB		 2422 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
2423 if (ret)
2424 return ret;
f28ea365
EJ		 2425 }
2426 return 0;
2427}
2428EXPORT_SYMBOL(sock_cmsg_send);
2429
06044751
ED		 2430static void sk_enter_memory_pressure(struct sock *sk)
2431{
2432 if (!sk->sk_prot->enter_memory_pressure)
2433 return;
2434
2435 sk->sk_prot->enter_memory_pressure(sk);
2436}
2437
2438static void sk_leave_memory_pressure(struct sock *sk)
2439{
2440 if (sk->sk_prot->leave_memory_pressure) {
2441 sk->sk_prot->leave_memory_pressure(sk);
2442 } else {
2443 unsigned long *memory_pressure = sk->sk_prot->memory_pressure;
2444
503978ac
ED		 2445 if (memory_pressure && READ_ONCE(*memory_pressure))
2446 WRITE_ONCE(*memory_pressure, 0);
06044751
ED		 2447 }
2448}
2449
5640f768 2450#define SKB_FRAG_PAGE_ORDER get_order(32768)
ce27ec60 2451DEFINE_STATIC_KEY_FALSE(net_high_order_alloc_disable_key);
5640f768 2452
400dfd3a
ED		 2453/**
2454 * skb_page_frag_refill - check that a page_frag contains enough room
2455 * @sz: minimum size of the fragment we want to get
2456 * @pfrag: pointer to page_frag
82d5e2b8 2457 * @gfp: priority for memory allocation
400dfd3a
ED		 2458 *
2459 * Note: While this allocator tries to use high order pages, there is
2460 * no guarantee that allocations succeed. Therefore, @sz MUST be
2461 * less or equal than PAGE_SIZE.
2462 */
d9b2938a 2463bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 2464{
5640f768 2465 if (pfrag->page) {
fe896d18 2466 if (page_ref_count(pfrag->page) == 1) {
5640f768
ED		 2467 pfrag->offset = 0;
2468 return true;
2469 }
400dfd3a 2470 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 2471 return true;
2472 put_page(pfrag->page);
2473 }
2474
d9b2938a 2475 pfrag->offset = 0;
ce27ec60
ED		 2476 if (SKB_FRAG_PAGE_ORDER &&
2477 !static_branch_unlikely(&net_high_order_alloc_disable_key)) {
d0164adc
MG		 2478 /* Avoid direct reclaim but allow kswapd to wake */
2479 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
2480 __GFP_COMP | __GFP_NOWARN |
2481 __GFP_NORETRY,
d9b2938a 2482 SKB_FRAG_PAGE_ORDER);
5640f768 2483 if (likely(pfrag->page)) {
d9b2938a 2484 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 2485 return true;
2486 }
d9b2938a
ED		 2487 }
2488 pfrag->page = alloc_page(gfp);
2489 if (likely(pfrag->page)) {
2490 pfrag->size = PAGE_SIZE;
2491 return true;
2492 }
400dfd3a
ED		 2493 return false;
2494}
2495EXPORT_SYMBOL(skb_page_frag_refill);
2496
2497bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2498{
2499 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2500 return true;
2501
5640f768
ED		 2502 sk_enter_memory_pressure(sk);
2503 sk_stream_moderate_sndbuf(sk);
2504 return false;
2505}
2506EXPORT_SYMBOL(sk_page_frag_refill);
2507
1da177e4 2508static void __lock_sock(struct sock *sk)
f39234d6
NK		 2509 __releases(&sk->sk_lock.slock)
2510 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 2511{
2512 DEFINE_WAIT(wait);
2513
e71a4783 2514 for (;;) {
1da177e4
LT		 2515 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2516 TASK_UNINTERRUPTIBLE);
2517 spin_unlock_bh(&sk->sk_lock.slock);
2518 schedule();
2519 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 2520 if (!sock_owned_by_user(sk))
1da177e4
LT		 2521 break;
2522 }
2523 finish_wait(&sk->sk_lock.wq, &wait);
2524}
2525
8873c064 2526void __release_sock(struct sock *sk)
f39234d6
NK		 2527 __releases(&sk->sk_lock.slock)
2528 __acquires(&sk->sk_lock.slock)
1da177e4 2529{
5413d1ba 2530 struct sk_buff *skb, *next;
1da177e4 2531
5413d1ba 2532 while ((skb = sk->sk_backlog.head) != NULL) {
1da177e4 2533 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1da177e4 2534
5413d1ba 2535 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4 2536
5413d1ba
ED		 2537 do {
2538 next = skb->next;
e4cbb02a 2539 prefetch(next);
7fee226a 2540 WARN_ON_ONCE(skb_dst_is_noref(skb));
a8305bff 2541 skb_mark_not_on_list(skb);
c57943a1 2542 sk_backlog_rcv(sk, skb);
1da177e4 2543
5413d1ba 2544 cond_resched();
1da177e4
LT		 2545
2546 skb = next;
2547 } while (skb != NULL);
2548
5413d1ba
ED		 2549 spin_lock_bh(&sk->sk_lock.slock);
2550 }
8eae939f
ZY		 2551
2552 /*
2553 * Doing the zeroing here guarantee we can not loop forever
2554 * while a wild producer attempts to flood us.
2555 */
2556 sk->sk_backlog.len = 0;
1da177e4
LT		 2557}
2558
d41a69f1
ED		 2559void __sk_flush_backlog(struct sock *sk)
2560{
2561 spin_lock_bh(&sk->sk_lock.slock);
2562 __release_sock(sk);
2563 spin_unlock_bh(&sk->sk_lock.slock);
2564}
2565
1da177e4
LT		 2566/**
2567 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 2568 * @sk: sock to wait on
2569 * @timeo: for how long
dfbafc99 2570 * @skb: last skb seen on sk_receive_queue
1da177e4
LT		 2571 *
2572 * Now socket state including sk->sk_err is changed only under lock,
2573 * hence we may omit checks after joining wait queue.
2574 * We check receive queue before schedule() only as optimization;
2575 * it is very likely that release_sock() added new data.
2576 */
dfbafc99 2577int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
1da177e4 2578{
d9dc8b0f 2579 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1da177e4 2580 int rc;
1da177e4 2581
d9dc8b0f 2582 add_wait_queue(sk_sleep(sk), &wait);
9cd3e072 2583 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
d9dc8b0f 2584 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
9cd3e072 2585 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
d9dc8b0f 2586 remove_wait_queue(sk_sleep(sk), &wait);
1da177e4
LT		 2587 return rc;
2588}
1da177e4
LT		 2589EXPORT_SYMBOL(sk_wait_data);
2590
3ab224be 2591/**
f8c3bf00 2592 * __sk_mem_raise_allocated - increase memory_allocated
3ab224be
HA		 2593 * @sk: socket
2594 * @size: memory size to allocate
f8c3bf00 2595 * @amt: pages to allocate
3ab224be
HA		 2596 * @kind: allocation type
2597 *
f8c3bf00 2598 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc
3ab224be 2599 */
f8c3bf00 2600int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
3ab224be
HA		 2601{
2602 struct proto *prot = sk->sk_prot;
f8c3bf00 2603 long allocated = sk_memory_allocated_add(sk, amt);
d6f19938 2604 bool charged = true;
e805605c 2605
baac50bb 2606 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
d6f19938 2607 !(charged = mem_cgroup_charge_skmem(sk->sk_memcg, amt)))
e805605c 2608 goto suppress_allocation;
3ab224be
HA		 2609
2610 /* Under limit. */
e805605c 2611 if (allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2612 sk_leave_memory_pressure(sk);
3ab224be
HA		 2613 return 1;
2614 }
2615
e805605c
JW		 2616 /* Under pressure. */
2617 if (allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2618 sk_enter_memory_pressure(sk);
3ab224be 2619
e805605c
JW		 2620 /* Over hard limit. */
2621 if (allocated > sk_prot_mem_limits(sk, 2))
3ab224be
HA		 2622 goto suppress_allocation;
2623
2624 /* guarantee minimum buffer size under pressure */
2625 if (kind == SK_MEM_RECV) {
a3dcaf17 2626 if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot))
3ab224be 2627 return 1;
180d8cd9 2628
3ab224be 2629 } else { /* SK_MEM_SEND */
a3dcaf17
ED		 2630 int wmem0 = sk_get_wmem0(sk, prot);
2631
3ab224be 2632 if (sk->sk_type == SOCK_STREAM) {
a3dcaf17 2633 if (sk->sk_wmem_queued < wmem0)
3ab224be 2634 return 1;
a3dcaf17 2635 } else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) {
3ab224be 2636 return 1;
a3dcaf17 2637 }
3ab224be
HA		 2638 }
2639
180d8cd9 2640 if (sk_has_memory_pressure(sk)) {
5bf325a5 2641 u64 alloc;
1748376b 2642
180d8cd9 2643 if (!sk_under_memory_pressure(sk))
1748376b 2644 return 1;
180d8cd9
GC		 2645 alloc = sk_sockets_allocated_read_positive(sk);
2646 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2647 sk_mem_pages(sk->sk_wmem_queued +
2648 atomic_read(&sk->sk_rmem_alloc) +
2649 sk->sk_forward_alloc))
2650 return 1;
2651 }
2652
2653suppress_allocation:
2654
2655 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2656 sk_stream_moderate_sndbuf(sk);
2657
2658 /* Fail only if socket is _under_ its sndbuf.
2659 * In this case we cannot block, so that we have to fail.
2660 */
2661 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2662 return 1;
2663 }
2664
d6f19938
YS		 2665 if (kind == SK_MEM_SEND || (kind == SK_MEM_RECV && charged))
2666 trace_sock_exceed_buf_limit(sk, prot, allocated, kind);
3847ce32 2667
0e90b31f 2668 sk_memory_allocated_sub(sk, amt);
180d8cd9 2669
baac50bb
JW		 2670 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2671 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
e805605c 2672
3ab224be
HA		 2673 return 0;
2674}
f8c3bf00
PA		 2675EXPORT_SYMBOL(__sk_mem_raise_allocated);
2676
2677/**
2678 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2679 * @sk: socket
2680 * @size: memory size to allocate
2681 * @kind: allocation type
2682 *
2683 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2684 * rmem allocation. This function assumes that protocols which have
2685 * memory_pressure use sk_wmem_queued as write buffer accounting.
2686 */
2687int __sk_mem_schedule(struct sock *sk, int size, int kind)
2688{
2689 int ret, amt = sk_mem_pages(size);
2690
2691 sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT;
2692 ret = __sk_mem_raise_allocated(sk, size, amt, kind);
2693 if (!ret)
2694 sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT;
2695 return ret;
2696}
3ab224be
HA		 2697EXPORT_SYMBOL(__sk_mem_schedule);
2698
2699/**
f8c3bf00 2700 * __sk_mem_reduce_allocated - reclaim memory_allocated
3ab224be 2701 * @sk: socket
f8c3bf00
PA		 2702 * @amount: number of quanta
2703 *
2704 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
3ab224be 2705 */
f8c3bf00 2706void __sk_mem_reduce_allocated(struct sock *sk, int amount)
3ab224be 2707{
1a24e04e 2708 sk_memory_allocated_sub(sk, amount);
3ab224be 2709
baac50bb
JW		 2710 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2711 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
e805605c 2712
180d8cd9
GC		 2713 if (sk_under_memory_pressure(sk) &&
2714 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2715 sk_leave_memory_pressure(sk);
3ab224be 2716}
f8c3bf00
PA		 2717EXPORT_SYMBOL(__sk_mem_reduce_allocated);
2718
2719/**
2720 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
2721 * @sk: socket
2722 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
2723 */
2724void __sk_mem_reclaim(struct sock *sk, int amount)
2725{
2726 amount >>= SK_MEM_QUANTUM_SHIFT;
2727 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
2728 __sk_mem_reduce_allocated(sk, amount);
2729}
3ab224be
HA		 2730EXPORT_SYMBOL(__sk_mem_reclaim);
2731
627d2d6b 2732int sk_set_peek_off(struct sock *sk, int val)
2733{
627d2d6b 2734 sk->sk_peek_off = val;
2735 return 0;
2736}
2737EXPORT_SYMBOL_GPL(sk_set_peek_off);
3ab224be 2738
1da177e4
LT		 2739/*
2740 * Set of default routines for initialising struct proto_ops when
2741 * the protocol does not support a particular function. In certain
2742 * cases where it makes no sense for a protocol to have a "do nothing"
2743 * function, some default processing is provided.
2744 */
2745
2746int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2747{
2748 return -EOPNOTSUPP;
2749}
2a91525c 2750EXPORT_SYMBOL(sock_no_bind);
1da177e4 2751
4ec93edb 2752int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2753 int len, int flags)
2754{
2755 return -EOPNOTSUPP;
2756}
2a91525c 2757EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2758
2759int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2760{
2761 return -EOPNOTSUPP;
2762}
2a91525c 2763EXPORT_SYMBOL(sock_no_socketpair);
1da177e4 2764
cdfbabfb
DH		 2765int sock_no_accept(struct socket *sock, struct socket *newsock, int flags,
2766 bool kern)
1da177e4
LT		 2767{
2768 return -EOPNOTSUPP;
2769}
2a91525c 2770EXPORT_SYMBOL(sock_no_accept);
1da177e4 2771
4ec93edb 2772int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
9b2c45d4 2773 int peer)
1da177e4
LT		 2774{
2775 return -EOPNOTSUPP;
2776}
2a91525c 2777EXPORT_SYMBOL(sock_no_getname);
1da177e4 2778
1da177e4
LT		 2779int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2780{
2781 return -EOPNOTSUPP;
2782}
2a91525c 2783EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2784
2785int sock_no_listen(struct socket *sock, int backlog)
2786{
2787 return -EOPNOTSUPP;
2788}
2a91525c 2789EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2790
2791int sock_no_shutdown(struct socket *sock, int how)
2792{
2793 return -EOPNOTSUPP;
2794}
2a91525c 2795EXPORT_SYMBOL(sock_no_shutdown);
1da177e4 2796
1b784140 2797int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
1da177e4
LT		 2798{
2799 return -EOPNOTSUPP;
2800}
2a91525c 2801EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4 2802
306b13eb
TH		 2803int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len)
2804{
2805 return -EOPNOTSUPP;
2806}
2807EXPORT_SYMBOL(sock_no_sendmsg_locked);
2808
1b784140
YX		 2809int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2810 int flags)
1da177e4
LT		 2811{
2812 return -EOPNOTSUPP;
2813}
2a91525c 2814EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2815
2816int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2817{
2818 /* Mirror missing mmap method error code */
2819 return -ENODEV;
2820}
2a91525c 2821EXPORT_SYMBOL(sock_no_mmap);
1da177e4 2822
d9539752
KC		 2823/*
2824 * When a file is received (via SCM_RIGHTS, etc), we must bump the
2825 * various sock-based usage counts.
2826 */
2827void __receive_sock(struct file *file)
2828{
2829 struct socket *sock;
2830 int error;
2831
2832 /*
2833 * The resulting value of "error" is ignored here since we only
2834 * need to take action when the file is a socket and testing
2835 * "sock" for NULL is sufficient.
2836 */
2837 sock = sock_from_file(file, &error);
2838 if (sock) {
2839 sock_update_netprioidx(&sock->sk->sk_cgrp_data);
2840 sock_update_classid(&sock->sk->sk_cgrp_data);
2841 }
2842}
2843
1da177e4
LT		 2844ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2845{
2846 ssize_t res;
2847 struct msghdr msg = {.msg_flags = flags};
2848 struct kvec iov;
2849 char *kaddr = kmap(page);
2850 iov.iov_base = kaddr + offset;
2851 iov.iov_len = size;
2852 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2853 kunmap(page);
2854 return res;
2855}
2a91525c 2856EXPORT_SYMBOL(sock_no_sendpage);
1da177e4 2857
306b13eb
TH		 2858ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page,
2859 int offset, size_t size, int flags)
2860{
2861 ssize_t res;
2862 struct msghdr msg = {.msg_flags = flags};
2863 struct kvec iov;
2864 char *kaddr = kmap(page);
2865
2866 iov.iov_base = kaddr + offset;
2867 iov.iov_len = size;
2868 res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size);
2869 kunmap(page);
2870 return res;
2871}
2872EXPORT_SYMBOL(sock_no_sendpage_locked);
2873
1da177e4
LT		 2874/*
2875 * Default Socket Callbacks
2876 */
2877
2878static void sock_def_wakeup(struct sock *sk)
2879{
43815482
ED		 2880 struct socket_wq *wq;
2881
2882 rcu_read_lock();
2883 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2884 if (skwq_has_sleeper(wq))
43815482
ED		 2885 wake_up_interruptible_all(&wq->wait);
2886 rcu_read_unlock();
1da177e4
LT		 2887}
2888
2889static void sock_def_error_report(struct sock *sk)
2890{
43815482
ED		 2891 struct socket_wq *wq;
2892
2893 rcu_read_lock();
2894 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2895 if (skwq_has_sleeper(wq))
a9a08845 2896 wake_up_interruptible_poll(&wq->wait, EPOLLERR);
8d8ad9d7 2897 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2898 rcu_read_unlock();
1da177e4
LT		 2899}
2900
43a825af 2901void sock_def_readable(struct sock *sk)
1da177e4 2902{
43815482
ED		 2903 struct socket_wq *wq;
2904
2905 rcu_read_lock();
2906 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2907 if (skwq_has_sleeper(wq))
a9a08845
LT		 2908 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
2909 EPOLLRDNORM | EPOLLRDBAND);
8d8ad9d7 2910 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2911 rcu_read_unlock();
1da177e4
LT		 2912}
2913
2914static void sock_def_write_space(struct sock *sk)
2915{
43815482
ED		 2916 struct socket_wq *wq;
2917
2918 rcu_read_lock();
1da177e4
LT		 2919
2920 /* Do not wake up a writer until he can make "significant"
2921 * progress. --DaveM
2922 */
e292f05e 2923 if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= READ_ONCE(sk->sk_sndbuf)) {
43815482 2924 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2925 if (skwq_has_sleeper(wq))
a9a08845
LT		 2926 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2927 EPOLLWRNORM | EPOLLWRBAND);
1da177e4
LT		 2928
2929 /* Should agree with poll, otherwise some programs break */
2930 if (sock_writeable(sk))
8d8ad9d7 2931 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2932 }
2933
43815482 2934 rcu_read_unlock();
1da177e4
LT		 2935}
2936
2937static void sock_def_destruct(struct sock *sk)
2938{
1da177e4
LT		 2939}
2940
2941void sk_send_sigurg(struct sock *sk)
2942{
2943 if (sk->sk_socket && sk->sk_socket->file)
2944 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2945 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2946}
2a91525c 2947EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2948
2949void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2950 unsigned long expires)
2951{
2952 if (!mod_timer(timer, expires))
2953 sock_hold(sk);
2954}
1da177e4
LT		 2955EXPORT_SYMBOL(sk_reset_timer);
2956
2957void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2958{
25cc4ae9 2959 if (del_timer(timer))
1da177e4
LT		 2960 __sock_put(sk);
2961}
1da177e4
LT		 2962EXPORT_SYMBOL(sk_stop_timer);
2963
2964void sock_init_data(struct socket *sock, struct sock *sk)
2965{
581319c5 2966 sk_init_common(sk);
1da177e4
LT		 2967 sk->sk_send_head = NULL;
2968
99767f27 2969 timer_setup(&sk->sk_timer, NULL, 0);
4ec93edb 2970
1da177e4
LT		 2971 sk->sk_allocation = GFP_KERNEL;
2972 sk->sk_rcvbuf = sysctl_rmem_default;
2973 sk->sk_sndbuf = sysctl_wmem_default;
2974 sk->sk_state = TCP_CLOSE;
972692e0 2975 sk_set_socket(sk, sock);
1da177e4
LT		 2976
2977 sock_set_flag(sk, SOCK_ZAPPED);
2978
e71a4783 2979 if (sock) {
1da177e4 2980 sk->sk_type = sock->type;
333f7909 2981 RCU_INIT_POINTER(sk->sk_wq, &sock->wq);
1da177e4 2982 sock->sk = sk;
86741ec2
LC		 2983 sk->sk_uid = SOCK_INODE(sock)->i_uid;
2984 } else {
c2f26e8f 2985 RCU_INIT_POINTER(sk->sk_wq, NULL);
86741ec2
LC		 2986 sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0);
2987 }
1da177e4 2988
1da177e4 2989 rwlock_init(&sk->sk_callback_lock);
cdfbabfb
DH		 2990 if (sk->sk_kern_sock)
2991 lockdep_set_class_and_name(
2992 &sk->sk_callback_lock,
2993 af_kern_callback_keys + sk->sk_family,
2994 af_family_kern_clock_key_strings[sk->sk_family]);
2995 else
2996 lockdep_set_class_and_name(
2997 &sk->sk_callback_lock,
443aef0e
PZ		 2998 af_callback_keys + sk->sk_family,
2999 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 3000
3001 sk->sk_state_change = sock_def_wakeup;
3002 sk->sk_data_ready = sock_def_readable;
3003 sk->sk_write_space = sock_def_write_space;
3004 sk->sk_error_report = sock_def_error_report;
3005 sk->sk_destruct = sock_def_destruct;
3006
5640f768
ED		 3007 sk->sk_frag.page = NULL;
3008 sk->sk_frag.offset = 0;
ef64a54f 3009 sk->sk_peek_off = -1;
1da177e4 3010
109f6e39
EB		 3011 sk->sk_peer_pid = NULL;
3012 sk->sk_peer_cred = NULL;
1da177e4
LT		 3013 sk->sk_write_pending = 0;
3014 sk->sk_rcvlowat = 1;
3015 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
3016 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
3017
6c7c98ba 3018 sk->sk_stamp = SK_DEFAULT_STAMP;
3a0ed3e9
DD		 3019#if BITS_PER_LONG==32
3020 seqlock_init(&sk->sk_stamp_seq);
3021#endif
52267790 3022 atomic_set(&sk->sk_zckey, 0);
1da177e4 3023
e0d1095a 3024#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 3025 sk->sk_napi_id = 0;
64b0dc51 3026 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 3027#endif
3028
76a9ebe8
ED		 3029 sk->sk_max_pacing_rate = ~0UL;
3030 sk->sk_pacing_rate = ~0UL;
7c68fa2b 3031 WRITE_ONCE(sk->sk_pacing_shift, 10);
70da268b 3032 sk->sk_incoming_cpu = -1;
c6345ce7
AN		 3033
3034 sk_rx_queue_clear(sk);
4dc6dc71
ED		 3035 /*
3036 * Before updating sk_refcnt, we must commit prior changes to memory
2cdb54c9 3037 * (Documentation/RCU/rculist_nulls.rst for details)
4dc6dc71
ED		 3038 */
3039 smp_wmb();
41c6d650 3040 refcount_set(&sk->sk_refcnt, 1);
33c732c3 3041 atomic_set(&sk->sk_drops, 0);
1da177e4 3042}
2a91525c 3043EXPORT_SYMBOL(sock_init_data);
1da177e4 3044
b5606c2d 3045void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 3046{
3047 might_sleep();
a5b5bb9a 3048 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 3049 if (sk->sk_lock.owned)
1da177e4 3050 __lock_sock(sk);
d2e9117c 3051 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 3052 spin_unlock(&sk->sk_lock.slock);
3053 /*
3054 * The sk_lock has mutex_lock() semantics here:
3055 */
fcc70d5f 3056 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 3057 local_bh_enable();
1da177e4 3058}
fcc70d5f 3059EXPORT_SYMBOL(lock_sock_nested);
1da177e4 3060
b5606c2d 3061void release_sock(struct sock *sk)
1da177e4 3062{
a5b5bb9a 3063 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 3064 if (sk->sk_backlog.tail)
3065 __release_sock(sk);
46d3ceab 3066
c3f9b018
ED		 3067 /* Warning : release_cb() might need to release sk ownership,
3068 * ie call sock_release_ownership(sk) before us.
3069 */
46d3ceab
ED		 3070 if (sk->sk_prot->release_cb)
3071 sk->sk_prot->release_cb(sk);
3072
c3f9b018 3073 sock_release_ownership(sk);
a5b5bb9a
IM		 3074 if (waitqueue_active(&sk->sk_lock.wq))
3075 wake_up(&sk->sk_lock.wq);
3076 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 3077}
3078EXPORT_SYMBOL(release_sock);
3079
8a74ad60
ED		 3080/**
3081 * lock_sock_fast - fast version of lock_sock
3082 * @sk: socket
3083 *
3084 * This version should be used for very small section, where process wont block
d651983d
MCC		 3085 * return false if fast path is taken:
3086 *
8a74ad60 3087 * sk_lock.slock locked, owned = 0, BH disabled
d651983d
MCC		 3088 *
3089 * return true if slow path is taken:
3090 *
8a74ad60
ED		 3091 * sk_lock.slock unlocked, owned = 1, BH enabled
3092 */
3093bool lock_sock_fast(struct sock *sk)
3094{
3095 might_sleep();
3096 spin_lock_bh(&sk->sk_lock.slock);
3097
3098 if (!sk->sk_lock.owned)
3099 /*
3100 * Note : We must disable BH
3101 */
3102 return false;
3103
3104 __lock_sock(sk);
3105 sk->sk_lock.owned = 1;
3106 spin_unlock(&sk->sk_lock.slock);
3107 /*
3108 * The sk_lock has mutex_lock() semantics here:
3109 */
3110 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
3111 local_bh_enable();
3112 return true;
3113}
3114EXPORT_SYMBOL(lock_sock_fast);
3115
c7cbdbf2
AB		 3116int sock_gettstamp(struct socket *sock, void __user *userstamp,
3117 bool timeval, bool time32)
4ec93edb 3118{
c7cbdbf2
AB		 3119 struct sock *sk = sock->sk;
3120 struct timespec64 ts;
9dae3497
YS		 3121
3122 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
c7cbdbf2
AB		 3123 ts = ktime_to_timespec64(sock_read_timestamp(sk));
3124 if (ts.tv_sec == -1)
1da177e4 3125 return -ENOENT;
c7cbdbf2 3126 if (ts.tv_sec == 0) {
3a0ed3e9 3127 ktime_t kt = ktime_get_real();
f95f96a4 3128 sock_write_timestamp(sk, kt);
c7cbdbf2 3129 ts = ktime_to_timespec64(kt);
b7aa0bf7 3130 }
1da177e4 3131
c7cbdbf2
AB		 3132 if (timeval)
3133 ts.tv_nsec /= 1000;
9dae3497 3134
c7cbdbf2
AB		 3135#ifdef CONFIG_COMPAT_32BIT_TIME
3136 if (time32)
3137 return put_old_timespec32(&ts, userstamp);
3138#endif
3139#ifdef CONFIG_SPARC64
3140 /* beware of padding in sparc64 timeval */
3141 if (timeval && !in_compat_syscall()) {
3142 struct __kernel_old_timeval __user tv = {
c98f4822
SR		 3143 .tv_sec = ts.tv_sec,
3144 .tv_usec = ts.tv_nsec,
c7cbdbf2 3145 };
c98f4822 3146 if (copy_to_user(userstamp, &tv, sizeof(tv)))
c7cbdbf2
AB		 3147 return -EFAULT;
3148 return 0;
ae40eb1e 3149 }
c7cbdbf2
AB		 3150#endif
3151 return put_timespec64(&ts, userstamp);
ae40eb1e 3152}
c7cbdbf2 3153EXPORT_SYMBOL(sock_gettstamp);
ae40eb1e 3154
193d357d 3155void sock_enable_timestamp(struct sock *sk, enum sock_flags flag)
4ec93edb 3156{
20d49473 3157 if (!sock_flag(sk, flag)) {
08e29af3
ED		 3158 unsigned long previous_flags = sk->sk_flags;
3159
20d49473
PO		 3160 sock_set_flag(sk, flag);
3161 /*
3162 * we just set one of the two flags which require net
3163 * time stamping, but time stamping might have been on
3164 * already because of the other one
3165 */
080a270f
HFS		 3166 if (sock_needs_netstamp(sk) &&
3167 !(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 3168 net_enable_timestamp();
1da177e4
LT		 3169 }
3170}
1da177e4 3171
cb820f8e
RC		 3172int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
3173 int level, int type)
3174{
3175 struct sock_exterr_skb *serr;
364a9e93 3176 struct sk_buff *skb;
cb820f8e
RC		 3177 int copied, err;
3178
3179 err = -EAGAIN;
364a9e93 3180 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 3181 if (skb == NULL)
3182 goto out;
3183
3184 copied = skb->len;
3185 if (copied > len) {
3186 msg->msg_flags |= MSG_TRUNC;
3187 copied = len;
3188 }
51f3d02b 3189 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 3190 if (err)
3191 goto out_free_skb;
3192
3193 sock_recv_timestamp(msg, sk, skb);
3194
3195 serr = SKB_EXT_ERR(skb);
3196 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
3197
3198 msg->msg_flags |= MSG_ERRQUEUE;
3199 err = copied;
3200
cb820f8e
RC		 3201out_free_skb:
3202 kfree_skb(skb);
3203out:
3204 return err;
3205}
3206EXPORT_SYMBOL(sock_recv_errqueue);
3207
1da177e4
LT		 3208/*
3209 * Get a socket option on an socket.
3210 *
3211 * FIX: POSIX 1003.1g is very ambiguous here. It states that
3212 * asynchronous errors should be reported by getsockopt. We assume
3213 * this means if you specify SO_ERROR (otherwise whats the point of it).
3214 */
3215int sock_common_getsockopt(struct socket *sock, int level, int optname,
3216 char __user *optval, int __user *optlen)
3217{
3218 struct sock *sk = sock->sk;
3219
3220 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
3221}
1da177e4
LT		 3222EXPORT_SYMBOL(sock_common_getsockopt);
3223
1b784140
YX		 3224int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
3225 int flags)
1da177e4
LT		 3226{
3227 struct sock *sk = sock->sk;
3228 int addr_len = 0;
3229 int err;
3230
1b784140 3231 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
1da177e4
LT		 3232 flags & ~MSG_DONTWAIT, &addr_len);
3233 if (err >= 0)
3234 msg->msg_namelen = addr_len;
3235 return err;
3236}
1da177e4
LT		 3237EXPORT_SYMBOL(sock_common_recvmsg);
3238
3239/*
3240 * Set socket options on an inet socket.
3241 */
3242int sock_common_setsockopt(struct socket *sock, int level, int optname,
a7b75c5a 3243 sockptr_t optval, unsigned int optlen)
1da177e4
LT		 3244{
3245 struct sock *sk = sock->sk;
3246
3247 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
3248}
1da177e4
LT		 3249EXPORT_SYMBOL(sock_common_setsockopt);
3250
3251void sk_common_release(struct sock *sk)
3252{
3253 if (sk->sk_prot->destroy)
3254 sk->sk_prot->destroy(sk);
3255
3256 /*
3257 * Observation: when sock_common_release is called, processes have
3258 * no access to socket. But net still has.
3259 * Step one, detach it from networking:
3260 *
3261 * A. Remove from hash tables.
3262 */
3263
3264 sk->sk_prot->unhash(sk);
3265
3266 /*
3267 * In this point socket cannot receive new packets, but it is possible
3268 * that some packets are in flight because some CPU runs receiver and
3269 * did hash table lookup before we unhashed socket. They will achieve
3270 * receive queue and will be purged by socket destructor.
3271 *
3272 * Also we still have packets pending on receive queue and probably,
3273 * our own packets waiting in device queues. sock_destroy will drain
3274 * receive queue, but transmitted packets will delay socket destruction
3275 * until the last reference will be released.
3276 */
3277
3278 sock_orphan(sk);
3279
3280 xfrm_sk_free_policy(sk);
3281
e6848976 3282 sk_refcnt_debug_release(sk);
5640f768 3283
1da177e4
LT		 3284 sock_put(sk);
3285}
1da177e4
LT		 3286EXPORT_SYMBOL(sk_common_release);
3287
a2d133b1
JH		 3288void sk_get_meminfo(const struct sock *sk, u32 *mem)
3289{
3290 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
3291
3292 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
ebb3b78d 3293 mem[SK_MEMINFO_RCVBUF] = READ_ONCE(sk->sk_rcvbuf);
a2d133b1 3294 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
e292f05e 3295 mem[SK_MEMINFO_SNDBUF] = READ_ONCE(sk->sk_sndbuf);
a2d133b1 3296 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
ab4e846a 3297 mem[SK_MEMINFO_WMEM_QUEUED] = READ_ONCE(sk->sk_wmem_queued);
a2d133b1 3298 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
70c26558 3299 mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len);
a2d133b1
JH		 3300 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
3301}
3302
13ff3d6f
PE		 3303#ifdef CONFIG_PROC_FS
3304#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 3305struct prot_inuse {
3306 int val[PROTO_INUSE_NR];
3307};
13ff3d6f
PE		 3308
3309static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159 3310
70ee1159
PE		 3311void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
3312{
08fc7f81 3313 __this_cpu_add(net->core.prot_inuse->val[prot->inuse_idx], val);
70ee1159
PE		 3314}
3315EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
3316
3317int sock_prot_inuse_get(struct net *net, struct proto *prot)
3318{
3319 int cpu, idx = prot->inuse_idx;
3320 int res = 0;
3321
3322 for_each_possible_cpu(cpu)
08fc7f81 3323 res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx];
70ee1159
PE		 3324
3325 return res >= 0 ? res : 0;
3326}
3327EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
3328
648845ab
TZ		 3329static void sock_inuse_add(struct net *net, int val)
3330{
3331 this_cpu_add(*net->core.sock_inuse, val);
3332}
3333
3334int sock_inuse_get(struct net *net)
3335{
3336 int cpu, res = 0;
3337
3338 for_each_possible_cpu(cpu)
3339 res += *per_cpu_ptr(net->core.sock_inuse, cpu);
3340
3341 return res;
3342}
3343
3344EXPORT_SYMBOL_GPL(sock_inuse_get);
3345
2c8c1e72 3346static int __net_init sock_inuse_init_net(struct net *net)
70ee1159 3347{
08fc7f81 3348 net->core.prot_inuse = alloc_percpu(struct prot_inuse);
648845ab
TZ		 3349 if (net->core.prot_inuse == NULL)
3350 return -ENOMEM;
3351
3352 net->core.sock_inuse = alloc_percpu(int);
3353 if (net->core.sock_inuse == NULL)
3354 goto out;
3355
3356 return 0;
3357
3358out:
3359 free_percpu(net->core.prot_inuse);
3360 return -ENOMEM;
70ee1159
PE		 3361}
3362
2c8c1e72 3363static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159 3364{
08fc7f81 3365 free_percpu(net->core.prot_inuse);
648845ab 3366 free_percpu(net->core.sock_inuse);
70ee1159
PE		 3367}
3368
3369static struct pernet_operations net_inuse_ops = {
3370 .init = sock_inuse_init_net,
3371 .exit = sock_inuse_exit_net,
3372};
3373
3374static __init int net_inuse_init(void)
3375{
3376 if (register_pernet_subsys(&net_inuse_ops))
3377 panic("Cannot initialize net inuse counters");
3378
3379 return 0;
3380}
3381
3382core_initcall(net_inuse_init);
13ff3d6f 3383
b45ce321 3384static int assign_proto_idx(struct proto *prot)
13ff3d6f
PE		 3385{
3386 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
3387
3388 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 3389 pr_err("PROTO_INUSE_NR exhausted\n");
b45ce321 3390 return -ENOSPC;
13ff3d6f
PE		 3391 }
3392
3393 set_bit(prot->inuse_idx, proto_inuse_idx);
b45ce321 3394 return 0;
13ff3d6f
PE		 3395}
3396
3397static void release_proto_idx(struct proto *prot)
3398{
3399 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
3400 clear_bit(prot->inuse_idx, proto_inuse_idx);
3401}
3402#else
b45ce321 3403static inline int assign_proto_idx(struct proto *prot)
13ff3d6f 3404{
b45ce321 3405 return 0;
13ff3d6f
PE		 3406}
3407
3408static inline void release_proto_idx(struct proto *prot)
3409{
3410}
648845ab
TZ		 3411
3412static void sock_inuse_add(struct net *net, int val)
3413{
3414}
13ff3d6f
PE		 3415#endif
3416
0f5907af
ML		 3417static void tw_prot_cleanup(struct timewait_sock_ops *twsk_prot)
3418{
3419 if (!twsk_prot)
3420 return;
3421 kfree(twsk_prot->twsk_slab_name);
3422 twsk_prot->twsk_slab_name = NULL;
3423 kmem_cache_destroy(twsk_prot->twsk_slab);
3424 twsk_prot->twsk_slab = NULL;
3425}
3426
0159dfd3
ED		 3427static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
3428{
3429 if (!rsk_prot)
3430 return;
3431 kfree(rsk_prot->slab_name);
3432 rsk_prot->slab_name = NULL;
adf78eda
JL		 3433 kmem_cache_destroy(rsk_prot->slab);
3434 rsk_prot->slab = NULL;
0159dfd3
ED		 3435}
3436
3437static int req_prot_init(const struct proto *prot)
3438{
3439 struct request_sock_ops *rsk_prot = prot->rsk_prot;
3440
3441 if (!rsk_prot)
3442 return 0;
3443
3444 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
3445 prot->name);
3446 if (!rsk_prot->slab_name)
3447 return -ENOMEM;
3448
3449 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
3450 rsk_prot->obj_size, 0,
e699e2c6
SB		 3451 SLAB_ACCOUNT | prot->slab_flags,
3452 NULL);
0159dfd3
ED		 3453
3454 if (!rsk_prot->slab) {
3455 pr_crit("%s: Can't create request sock SLAB cache!\n",
3456 prot->name);
3457 return -ENOMEM;
3458 }
3459 return 0;
3460}
3461
b733c007
PE		 3462int proto_register(struct proto *prot, int alloc_slab)
3463{
b45ce321 3464 int ret = -ENOBUFS;
3465
1da177e4 3466 if (alloc_slab) {
30c2c9f1
DW		 3467 prot->slab = kmem_cache_create_usercopy(prot->name,
3468 prot->obj_size, 0,
e699e2c6
SB		 3469 SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT |
3470 prot->slab_flags,
289a4860 3471 prot->useroffset, prot->usersize,
271b72c7 3472 NULL);
1da177e4
LT		 3473
3474 if (prot->slab == NULL) {
e005d193
JP		 3475 pr_crit("%s: Can't create sock SLAB cache!\n",
3476 prot->name);
60e7663d 3477 goto out;
1da177e4 3478 }
2e6599cb 3479
0159dfd3
ED		 3480 if (req_prot_init(prot))
3481 goto out_free_request_sock_slab;
8feaf0c0 3482
6d6ee43e 3483 if (prot->twsk_prot != NULL) {
faf23422 3484 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 3485
7e56b5d6 3486 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 3487 goto out_free_request_sock_slab;
3488
6d6ee43e 3489 prot->twsk_prot->twsk_slab =
7e56b5d6 3490 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 3491 prot->twsk_prot->twsk_obj_size,
3ab5aee7 3492 0,
e699e2c6 3493 SLAB_ACCOUNT |
52db70dc 3494 prot->slab_flags,
20c2df83 3495 NULL);
6d6ee43e 3496 if (prot->twsk_prot->twsk_slab == NULL)
0f5907af 3497 goto out_free_timewait_sock_slab;
8feaf0c0 3498 }
1da177e4
LT		 3499 }
3500
36b77a52 3501 mutex_lock(&proto_list_mutex);
b45ce321 3502 ret = assign_proto_idx(prot);
3503 if (ret) {
3504 mutex_unlock(&proto_list_mutex);
0f5907af 3505 goto out_free_timewait_sock_slab;
b45ce321 3506 }
1da177e4 3507 list_add(&prot->node, &proto_list);
36b77a52 3508 mutex_unlock(&proto_list_mutex);
b45ce321 3509 return ret;
b733c007 3510
0f5907af 3511out_free_timewait_sock_slab:
b45ce321 3512 if (alloc_slab && prot->twsk_prot)
0f5907af 3513 tw_prot_cleanup(prot->twsk_prot);
8feaf0c0 3514out_free_request_sock_slab:
b45ce321 3515 if (alloc_slab) {
3516 req_prot_cleanup(prot->rsk_prot);
0159dfd3 3517
b45ce321 3518 kmem_cache_destroy(prot->slab);
3519 prot->slab = NULL;
3520 }
b733c007 3521out:
b45ce321 3522 return ret;
1da177e4 3523}
1da177e4
LT		 3524EXPORT_SYMBOL(proto_register);
3525
3526void proto_unregister(struct proto *prot)
3527{
36b77a52 3528 mutex_lock(&proto_list_mutex);
13ff3d6f 3529 release_proto_idx(prot);
0a3f4358 3530 list_del(&prot->node);
36b77a52 3531 mutex_unlock(&proto_list_mutex);
1da177e4 3532
adf78eda
JL		 3533 kmem_cache_destroy(prot->slab);
3534 prot->slab = NULL;
1da177e4 3535
0159dfd3 3536 req_prot_cleanup(prot->rsk_prot);
0f5907af 3537 tw_prot_cleanup(prot->twsk_prot);
1da177e4 3538}
1da177e4
LT		 3539EXPORT_SYMBOL(proto_unregister);
3540
bf2ae2e4
XL		 3541int sock_load_diag_module(int family, int protocol)
3542{
3543 if (!protocol) {
3544 if (!sock_is_registered(family))
3545 return -ENOENT;
3546
3547 return request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
3548 NETLINK_SOCK_DIAG, family);
3549 }
3550
3551#ifdef CONFIG_INET
3552 if (family == AF_INET &&
c34c1287 3553 protocol != IPPROTO_RAW &&
3f935c75 3554 protocol < MAX_INET_PROTOS &&
bf2ae2e4
XL		 3555 !rcu_access_pointer(inet_protos[protocol]))
3556 return -ENOENT;
3557#endif
3558
3559 return request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
3560 NETLINK_SOCK_DIAG, family, protocol);
3561}
3562EXPORT_SYMBOL(sock_load_diag_module);
3563
1da177e4 3564#ifdef CONFIG_PROC_FS
1da177e4 3565static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 3566 __acquires(proto_list_mutex)
1da177e4 3567{
36b77a52 3568 mutex_lock(&proto_list_mutex);
60f0438a 3569 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 3570}
3571
3572static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3573{
60f0438a 3574 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 3575}
3576
3577static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 3578 __releases(proto_list_mutex)
1da177e4 3579{
36b77a52 3580 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 3581}
3582
3583static char proto_method_implemented(const void *method)
3584{
3585 return method == NULL ? 'n' : 'y';
3586}
180d8cd9
GC		 3587static long sock_prot_memory_allocated(struct proto *proto)
3588{
cb75a36c 3589 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 3590}
3591
7a512eb8 3592static const char *sock_prot_memory_pressure(struct proto *proto)
180d8cd9
GC		 3593{
3594 return proto->memory_pressure != NULL ?
3595 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
3596}
1da177e4
LT		 3597
3598static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
3599{
180d8cd9 3600
8d987e5c 3601 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 3602 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3603 proto->name,
3604 proto->obj_size,
14e943db 3605 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 3606 sock_prot_memory_allocated(proto),
3607 sock_prot_memory_pressure(proto),
1da177e4
LT		 3608 proto->max_header,
3609 proto->slab == NULL ? "no" : "yes",
3610 module_name(proto->owner),
3611 proto_method_implemented(proto->close),
3612 proto_method_implemented(proto->connect),
3613 proto_method_implemented(proto->disconnect),
3614 proto_method_implemented(proto->accept),
3615 proto_method_implemented(proto->ioctl),
3616 proto_method_implemented(proto->init),
3617 proto_method_implemented(proto->destroy),
3618 proto_method_implemented(proto->shutdown),
3619 proto_method_implemented(proto->setsockopt),
3620 proto_method_implemented(proto->getsockopt),
3621 proto_method_implemented(proto->sendmsg),
3622 proto_method_implemented(proto->recvmsg),
3623 proto_method_implemented(proto->sendpage),
3624 proto_method_implemented(proto->bind),
3625 proto_method_implemented(proto->backlog_rcv),
3626 proto_method_implemented(proto->hash),
3627 proto_method_implemented(proto->unhash),
3628 proto_method_implemented(proto->get_port),
3629 proto_method_implemented(proto->enter_memory_pressure));
3630}
3631
3632static int proto_seq_show(struct seq_file *seq, void *v)
3633{
60f0438a 3634 if (v == &proto_list)
1da177e4
LT		 3635 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3636 "protocol",
3637 "size",
3638 "sockets",
3639 "memory",
3640 "press",
3641 "maxhdr",
3642 "slab",
3643 "module",
3644 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3645 else
60f0438a 3646 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 3647 return 0;
3648}
3649
f690808e 3650static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 3651 .start = proto_seq_start,
3652 .next = proto_seq_next,
3653 .stop = proto_seq_stop,
3654 .show = proto_seq_show,
3655};
3656
14e943db
ED		 3657static __net_init int proto_init_net(struct net *net)
3658{
c3506372
CH		 3659 if (!proc_create_net("protocols", 0444, net->proc_net, &proto_seq_ops,
3660 sizeof(struct seq_net_private)))
14e943db
ED		 3661 return -ENOMEM;
3662
3663 return 0;
3664}
3665
3666static __net_exit void proto_exit_net(struct net *net)
3667{
ece31ffd 3668 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 3669}
3670
3671
3672static __net_initdata struct pernet_operations proto_net_ops = {
3673 .init = proto_init_net,
3674 .exit = proto_exit_net,
1da177e4
LT		 3675};
3676
3677static int __init proto_init(void)
3678{
14e943db 3679 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 3680}
3681
3682subsys_initcall(proto_init);
3683
3684#endif /* PROC_FS */
7db6b048
SS		 3685
3686#ifdef CONFIG_NET_RX_BUSY_POLL
3687bool sk_busy_loop_end(void *p, unsigned long start_time)
3688{
3689 struct sock *sk = p;
3690
3f926af3 3691 return !skb_queue_empty_lockless(&sk->sk_receive_queue) ||
7db6b048
SS		 3692 sk_busy_loop_timeout(sk, start_time);
3693}
3694EXPORT_SYMBOL(sk_busy_loop_end);
3695#endif /* CONFIG_NET_RX_BUSY_POLL */
c0425a42
CH		 3696
3697int sock_bind_add(struct sock *sk, struct sockaddr *addr, int addr_len)
3698{
3699 if (!sk->sk_prot->bind_add)
3700 return -EOPNOTSUPP;
3701 return sk->sk_prot->bind_add(sk, addr, addr_len);
3702}
3703EXPORT_SYMBOL(sock_bind_add);
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