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net: silence KCSAN warnings about sk->sk_backlog.len reads
[linux-2.6-block.git] / net / core / sock.c
CommitLineData
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>
1da177e4 116
7c0f6ba6 117#include <linux/uaccess.h>
1da177e4
LT		 118
119#include <linux/netdevice.h>
120#include <net/protocol.h>
121#include <linux/skbuff.h>
457c4cbc 122#include <net/net_namespace.h>
2e6599cb 123#include <net/request_sock.h>
1da177e4 124#include <net/sock.h>
20d49473 125#include <linux/net_tstamp.h>
1da177e4
LT		 126#include <net/xfrm.h>
127#include <linux/ipsec.h>
f8451725 128#include <net/cls_cgroup.h>
5bc1421e 129#include <net/netprio_cgroup.h>
eb4cb008 130#include <linux/sock_diag.h>
1da177e4
LT		 131
132#include <linux/filter.h>
538950a1 133#include <net/sock_reuseport.h>
6ac99e8f 134#include <net/bpf_sk_storage.h>
1da177e4 135
3847ce32
SM		 136#include <trace/events/sock.h>
137
1da177e4 138#include <net/tcp.h>
076bb0c8 139#include <net/busy_poll.h>
06021292 140
36b77a52 141static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 142static LIST_HEAD(proto_list);
143
648845ab
TZ		 144static void sock_inuse_add(struct net *net, int val);
145
a3b299da
EB		 146/**
147 * sk_ns_capable - General socket capability test
148 * @sk: Socket to use a capability on or through
149 * @user_ns: The user namespace of the capability to use
150 * @cap: The capability to use
151 *
152 * Test to see if the opener of the socket had when the socket was
153 * created and the current process has the capability @cap in the user
154 * namespace @user_ns.
155 */
156bool sk_ns_capable(const struct sock *sk,
157 struct user_namespace *user_ns, int cap)
158{
159 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
160 ns_capable(user_ns, cap);
161}
162EXPORT_SYMBOL(sk_ns_capable);
163
164/**
165 * sk_capable - Socket global capability test
166 * @sk: Socket to use a capability on or through
e793c0f7 167 * @cap: The global capability to use
a3b299da
EB		 168 *
169 * Test to see if the opener of the socket had when the socket was
170 * created and the current process has the capability @cap in all user
171 * namespaces.
172 */
173bool sk_capable(const struct sock *sk, int cap)
174{
175 return sk_ns_capable(sk, &init_user_ns, cap);
176}
177EXPORT_SYMBOL(sk_capable);
178
179/**
180 * sk_net_capable - Network namespace socket capability test
181 * @sk: Socket to use a capability on or through
182 * @cap: The capability to use
183 *
e793c0f7 184 * Test to see if the opener of the socket had when the socket was created
a3b299da
EB		 185 * and the current process has the capability @cap over the network namespace
186 * the socket is a member of.
187 */
188bool sk_net_capable(const struct sock *sk, int cap)
189{
190 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
191}
192EXPORT_SYMBOL(sk_net_capable);
193
da21f24d
IM		 194/*
195 * Each address family might have different locking rules, so we have
cdfbabfb
DH		 196 * one slock key per address family and separate keys for internal and
197 * userspace sockets.
da21f24d 198 */
a5b5bb9a 199static struct lock_class_key af_family_keys[AF_MAX];
cdfbabfb 200static struct lock_class_key af_family_kern_keys[AF_MAX];
a5b5bb9a 201static struct lock_class_key af_family_slock_keys[AF_MAX];
cdfbabfb 202static struct lock_class_key af_family_kern_slock_keys[AF_MAX];
a5b5bb9a 203
a5b5bb9a
IM		 204/*
205 * Make lock validator output more readable. (we pre-construct these
206 * strings build-time, so that runtime initialization of socket
207 * locks is fast):
208 */
cdfbabfb
DH		 209
210#define _sock_locks(x) \
211 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \
212 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \
213 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \
214 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \
215 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \
216 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \
217 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \
218 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \
219 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \
220 x "27" , x "28" , x "AF_CAN" , \
221 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \
222 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \
223 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \
224 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \
68e8b849
BT		 225 x "AF_QIPCRTR", x "AF_SMC" , x "AF_XDP" , \
226 x "AF_MAX"
cdfbabfb 227
36cbd3dc 228static const char *const af_family_key_strings[AF_MAX+1] = {
cdfbabfb 229 _sock_locks("sk_lock-")
a5b5bb9a 230};
36cbd3dc 231static const char *const af_family_slock_key_strings[AF_MAX+1] = {
cdfbabfb 232 _sock_locks("slock-")
a5b5bb9a 233};
36cbd3dc 234static const char *const af_family_clock_key_strings[AF_MAX+1] = {
cdfbabfb
DH		 235 _sock_locks("clock-")
236};
237
238static const char *const af_family_kern_key_strings[AF_MAX+1] = {
239 _sock_locks("k-sk_lock-")
240};
241static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = {
242 _sock_locks("k-slock-")
243};
244static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = {
245 _sock_locks("k-clock-")
443aef0e 246};
581319c5 247static const char *const af_family_rlock_key_strings[AF_MAX+1] = {
6b431d50 248 _sock_locks("rlock-")
581319c5
PA		 249};
250static const char *const af_family_wlock_key_strings[AF_MAX+1] = {
6b431d50 251 _sock_locks("wlock-")
581319c5
PA		 252};
253static const char *const af_family_elock_key_strings[AF_MAX+1] = {
6b431d50 254 _sock_locks("elock-")
581319c5 255};
da21f24d
IM		 256
257/*
581319c5 258 * sk_callback_lock and sk queues locking rules are per-address-family,
da21f24d
IM		 259 * so split the lock classes by using a per-AF key:
260 */
261static struct lock_class_key af_callback_keys[AF_MAX];
581319c5
PA		 262static struct lock_class_key af_rlock_keys[AF_MAX];
263static struct lock_class_key af_wlock_keys[AF_MAX];
264static struct lock_class_key af_elock_keys[AF_MAX];
cdfbabfb 265static struct lock_class_key af_kern_callback_keys[AF_MAX];
da21f24d 266
1da177e4 267/* Run time adjustable parameters. */
ab32ea5d 268__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 269EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 270__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 271EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 272__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
273__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 274
25985edc 275/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 276int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 277EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 278
b245be1f
WB		 279int sysctl_tstamp_allow_data __read_mostly = 1;
280
a7950ae8
DB		 281DEFINE_STATIC_KEY_FALSE(memalloc_socks_key);
282EXPORT_SYMBOL_GPL(memalloc_socks_key);
c93bdd0e 283
7cb02404
MG		 284/**
285 * sk_set_memalloc - sets %SOCK_MEMALLOC
286 * @sk: socket to set it on
287 *
288 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
289 * It's the responsibility of the admin to adjust min_free_kbytes
290 * to meet the requirements
291 */
292void sk_set_memalloc(struct sock *sk)
293{
294 sock_set_flag(sk, SOCK_MEMALLOC);
295 sk->sk_allocation |= __GFP_MEMALLOC;
a7950ae8 296 static_branch_inc(&memalloc_socks_key);
7cb02404
MG		 297}
298EXPORT_SYMBOL_GPL(sk_set_memalloc);
299
300void sk_clear_memalloc(struct sock *sk)
301{
302 sock_reset_flag(sk, SOCK_MEMALLOC);
303 sk->sk_allocation &= ~__GFP_MEMALLOC;
a7950ae8 304 static_branch_dec(&memalloc_socks_key);
c76562b6
MG		 305
306 /*
307 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
5d753610
MG		 308 * progress of swapping. SOCK_MEMALLOC may be cleared while
309 * it has rmem allocations due to the last swapfile being deactivated
310 * but there is a risk that the socket is unusable due to exceeding
311 * the rmem limits. Reclaim the reserves and obey rmem limits again.
c76562b6 312 */
5d753610 313 sk_mem_reclaim(sk);
7cb02404
MG		 314}
315EXPORT_SYMBOL_GPL(sk_clear_memalloc);
316
b4b9e355
MG		 317int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
318{
319 int ret;
f1083048 320 unsigned int noreclaim_flag;
b4b9e355
MG		 321
322 /* these should have been dropped before queueing */
323 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
324
f1083048 325 noreclaim_flag = memalloc_noreclaim_save();
b4b9e355 326 ret = sk->sk_backlog_rcv(sk, skb);
f1083048 327 memalloc_noreclaim_restore(noreclaim_flag);
b4b9e355
MG		 328
329 return ret;
330}
331EXPORT_SYMBOL(__sk_backlog_rcv);
332
a9beb86a 333static int sock_get_timeout(long timeo, void *optval, bool old_timeval)
fe0c72f3 334{
a9beb86a
DD		 335 struct __kernel_sock_timeval tv;
336 int size;
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;
357 size = sizeof(old_tv);
358 } else {
359 *(struct __kernel_sock_timeval *)optval = tv;
360 size = sizeof(tv);
361 }
362
363 return size;
fe0c72f3
AB		 364}
365
a9beb86a 366static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen, bool old_timeval)
1da177e4 367{
a9beb86a 368 struct __kernel_sock_timeval tv;
1da177e4 369
e6986423 370 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
fe0c72f3
AB		 371 struct old_timeval32 tv32;
372
373 if (optlen < sizeof(tv32))
374 return -EINVAL;
375
376 if (copy_from_user(&tv32, optval, sizeof(tv32)))
377 return -EFAULT;
378 tv.tv_sec = tv32.tv_sec;
379 tv.tv_usec = tv32.tv_usec;
a9beb86a
DD		 380 } else if (old_timeval) {
381 struct __kernel_old_timeval old_tv;
382
383 if (optlen < sizeof(old_tv))
384 return -EINVAL;
385 if (copy_from_user(&old_tv, optval, sizeof(old_tv)))
386 return -EFAULT;
387 tv.tv_sec = old_tv.tv_sec;
388 tv.tv_usec = old_tv.tv_usec;
fe0c72f3
AB		 389 } else {
390 if (optlen < sizeof(tv))
391 return -EINVAL;
392 if (copy_from_user(&tv, optval, sizeof(tv)))
393 return -EFAULT;
394 }
ba78073e
VA		 395 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
396 return -EDOM;
1da177e4 397
ba78073e 398 if (tv.tv_sec < 0) {
6f11df83
AM		 399 static int warned __read_mostly;
400
ba78073e 401 *timeo_p = 0;
50aab54f 402 if (warned < 10 && net_ratelimit()) {
ba78073e 403 warned++;
e005d193
JP		 404 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
405 __func__, current->comm, task_pid_nr(current));
50aab54f 406 }
ba78073e
VA		 407 return 0;
408 }
1da177e4
LT		 409 *timeo_p = MAX_SCHEDULE_TIMEOUT;
410 if (tv.tv_sec == 0 && tv.tv_usec == 0)
411 return 0;
a9beb86a
DD		 412 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1))
413 *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP((unsigned long)tv.tv_usec, USEC_PER_SEC / HZ);
1da177e4
LT		 414 return 0;
415}
416
417static void sock_warn_obsolete_bsdism(const char *name)
418{
419 static int warned;
420 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 421 if (strcmp(warncomm, current->comm) && warned < 5) {
422 strcpy(warncomm, current->comm);
e005d193
JP		 423 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
424 warncomm, name);
1da177e4
LT		 425 warned++;
426 }
427}
428
080a270f
HFS		 429static bool sock_needs_netstamp(const struct sock *sk)
430{
431 switch (sk->sk_family) {
432 case AF_UNSPEC:
433 case AF_UNIX:
434 return false;
435 default:
436 return true;
437 }
438}
439
08e29af3 440static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 441{
08e29af3
ED		 442 if (sk->sk_flags & flags) {
443 sk->sk_flags &= ~flags;
080a270f
HFS		 444 if (sock_needs_netstamp(sk) &&
445 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 446 net_disable_timestamp();
1da177e4
LT		 447 }
448}
449
450
e6afc8ac 451int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
f0088a50 452{
3b885787
NH		 453 unsigned long flags;
454 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 455
0fd7bac6 456 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 457 atomic_inc(&sk->sk_drops);
3847ce32 458 trace_sock_rcvqueue_full(sk, skb);
766e9037 459 return -ENOMEM;
f0088a50
DV		 460 }
461
c76562b6 462 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 463 atomic_inc(&sk->sk_drops);
464 return -ENOBUFS;
3ab224be
HA		 465 }
466
f0088a50
DV		 467 skb->dev = NULL;
468 skb_set_owner_r(skb, sk);
49ad9599 469
7fee226a
ED		 470 /* we escape from rcu protected region, make sure we dont leak
471 * a norefcounted dst
472 */
473 skb_dst_force(skb);
474
3b885787 475 spin_lock_irqsave(&list->lock, flags);
3bc3b96f 476 sock_skb_set_dropcount(sk, skb);
3b885787
NH		 477 __skb_queue_tail(list, skb);
478 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 479
480 if (!sock_flag(sk, SOCK_DEAD))
676d2369 481 sk->sk_data_ready(sk);
766e9037 482 return 0;
f0088a50 483}
e6afc8ac 484EXPORT_SYMBOL(__sock_queue_rcv_skb);
485
486int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
487{
488 int err;
489
490 err = sk_filter(sk, skb);
491 if (err)
492 return err;
493
494 return __sock_queue_rcv_skb(sk, skb);
495}
f0088a50
DV		 496EXPORT_SYMBOL(sock_queue_rcv_skb);
497
4f0c40d9 498int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
c3f24cfb 499 const int nested, unsigned int trim_cap, bool refcounted)
f0088a50
DV		 500{
501 int rc = NET_RX_SUCCESS;
502
4f0c40d9 503 if (sk_filter_trim_cap(sk, skb, trim_cap))
f0088a50
DV		 504 goto discard_and_relse;
505
506 skb->dev = NULL;
507
274f482d 508 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 509 atomic_inc(&sk->sk_drops);
510 goto discard_and_relse;
511 }
58a5a7b9
ACM		 512 if (nested)
513 bh_lock_sock_nested(sk);
514 else
515 bh_lock_sock(sk);
a5b5bb9a
IM		 516 if (!sock_owned_by_user(sk)) {
517 /*
518 * trylock + unlock semantics:
519 */
520 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
521
c57943a1 522 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 523
524 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
8265792b 525 } else if (sk_add_backlog(sk, skb, READ_ONCE(sk->sk_rcvbuf))) {
8eae939f
ZY		 526 bh_unlock_sock(sk);
527 atomic_inc(&sk->sk_drops);
528 goto discard_and_relse;
529 }
530
f0088a50
DV		 531 bh_unlock_sock(sk);
532out:
c3f24cfb
ED		 533 if (refcounted)
534 sock_put(sk);
f0088a50
DV		 535 return rc;
536discard_and_relse:
537 kfree_skb(skb);
538 goto out;
539}
4f0c40d9 540EXPORT_SYMBOL(__sk_receive_skb);
f0088a50
DV		 541
542struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
543{
b6c6712a 544 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 545
546 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 547 sk_tx_queue_clear(sk);
9b8805a3 548 sk->sk_dst_pending_confirm = 0;
a9b3cd7f 549 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 550 dst_release(dst);
551 return NULL;
552 }
553
554 return dst;
555}
556EXPORT_SYMBOL(__sk_dst_check);
557
558struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
559{
560 struct dst_entry *dst = sk_dst_get(sk);
561
562 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
563 sk_dst_reset(sk);
564 dst_release(dst);
565 return NULL;
566 }
567
568 return dst;
569}
570EXPORT_SYMBOL(sk_dst_check);
571
f5dd3d0c 572static int sock_setbindtodevice_locked(struct sock *sk, int ifindex)
4878809f
DM		 573{
574 int ret = -ENOPROTOOPT;
575#ifdef CONFIG_NETDEVICES
3b1e0a65 576 struct net *net = sock_net(sk);
4878809f
DM		 577
578 /* Sorry... */
579 ret = -EPERM;
5e1fccc0 580 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 581 goto out;
582
f5dd3d0c
DH		 583 ret = -EINVAL;
584 if (ifindex < 0)
585 goto out;
586
587 sk->sk_bound_dev_if = ifindex;
588 if (sk->sk_prot->rehash)
589 sk->sk_prot->rehash(sk);
590 sk_dst_reset(sk);
591
592 ret = 0;
593
594out:
595#endif
596
597 return ret;
598}
599
600static int sock_setbindtodevice(struct sock *sk, char __user *optval,
601 int optlen)
602{
603 int ret = -ENOPROTOOPT;
604#ifdef CONFIG_NETDEVICES
605 struct net *net = sock_net(sk);
606 char devname[IFNAMSIZ];
607 int index;
608
4878809f
DM		 609 ret = -EINVAL;
610 if (optlen < 0)
611 goto out;
612
613 /* Bind this socket to a particular device like "eth0",
614 * as specified in the passed interface name. If the
615 * name is "" or the option length is zero the socket
616 * is not bound.
617 */
618 if (optlen > IFNAMSIZ - 1)
619 optlen = IFNAMSIZ - 1;
620 memset(devname, 0, sizeof(devname));
621
622 ret = -EFAULT;
623 if (copy_from_user(devname, optval, optlen))
624 goto out;
625
000ba2e4
DM		 626 index = 0;
627 if (devname[0] != '\0') {
bf8e56bf 628 struct net_device *dev;
4878809f 629
bf8e56bf
ED		 630 rcu_read_lock();
631 dev = dev_get_by_name_rcu(net, devname);
632 if (dev)
633 index = dev->ifindex;
634 rcu_read_unlock();
4878809f
DM		 635 ret = -ENODEV;
636 if (!dev)
637 goto out;
4878809f
DM		 638 }
639
640 lock_sock(sk);
f5dd3d0c 641 ret = sock_setbindtodevice_locked(sk, index);
4878809f
DM		 642 release_sock(sk);
643
4878809f
DM		 644out:
645#endif
646
647 return ret;
648}
649
c91f6df2
BH		 650static int sock_getbindtodevice(struct sock *sk, char __user *optval,
651 int __user *optlen, int len)
652{
653 int ret = -ENOPROTOOPT;
654#ifdef CONFIG_NETDEVICES
655 struct net *net = sock_net(sk);
c91f6df2 656 char devname[IFNAMSIZ];
c91f6df2
BH		 657
658 if (sk->sk_bound_dev_if == 0) {
659 len = 0;
660 goto zero;
661 }
662
663 ret = -EINVAL;
664 if (len < IFNAMSIZ)
665 goto out;
666
5dbe7c17
NS		 667 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
668 if (ret)
c91f6df2 669 goto out;
c91f6df2
BH		 670
671 len = strlen(devname) + 1;
672
673 ret = -EFAULT;
674 if (copy_to_user(optval, devname, len))
675 goto out;
676
677zero:
678 ret = -EFAULT;
679 if (put_user(len, optlen))
680 goto out;
681
682 ret = 0;
683
684out:
685#endif
686
687 return ret;
688}
689
c0ef877b
PE		 690static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
691{
692 if (valbool)
693 sock_set_flag(sk, bit);
694 else
695 sock_reset_flag(sk, bit);
696}
697
f60e5990 698bool sk_mc_loop(struct sock *sk)
699{
700 if (dev_recursion_level())
701 return false;
702 if (!sk)
703 return true;
704 switch (sk->sk_family) {
705 case AF_INET:
706 return inet_sk(sk)->mc_loop;
707#if IS_ENABLED(CONFIG_IPV6)
708 case AF_INET6:
709 return inet6_sk(sk)->mc_loop;
710#endif
711 }
712 WARN_ON(1);
713 return true;
714}
715EXPORT_SYMBOL(sk_mc_loop);
716
1da177e4
LT		 717/*
718 * This is meant for all protocols to use and covers goings on
719 * at the socket level. Everything here is generic.
720 */
721
722int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 723 char __user *optval, unsigned int optlen)
1da177e4 724{
80b14dee 725 struct sock_txtime sk_txtime;
2a91525c 726 struct sock *sk = sock->sk;
1da177e4
LT		 727 int val;
728 int valbool;
729 struct linger ling;
730 int ret = 0;
4ec93edb 731
1da177e4
LT		 732 /*
733 * Options without arguments
734 */
735
4878809f 736 if (optname == SO_BINDTODEVICE)
c91f6df2 737 return sock_setbindtodevice(sk, optval, optlen);
4878809f 738
e71a4783
SH		 739 if (optlen < sizeof(int))
740 return -EINVAL;
4ec93edb 741
1da177e4
LT		 742 if (get_user(val, (int __user *)optval))
743 return -EFAULT;
4ec93edb 744
2a91525c 745 valbool = val ? 1 : 0;
1da177e4
LT		 746
747 lock_sock(sk);
748
2a91525c 749 switch (optname) {
e71a4783 750 case SO_DEBUG:
2a91525c 751 if (val && !capable(CAP_NET_ADMIN))
e71a4783 752 ret = -EACCES;
2a91525c 753 else
c0ef877b 754 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 755 break;
756 case SO_REUSEADDR:
cdb8744d 757 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 758 break;
055dc21a
TH		 759 case SO_REUSEPORT:
760 sk->sk_reuseport = valbool;
761 break;
e71a4783 762 case SO_TYPE:
49c794e9 763 case SO_PROTOCOL:
0d6038ee 764 case SO_DOMAIN:
e71a4783
SH		 765 case SO_ERROR:
766 ret = -ENOPROTOOPT;
767 break;
768 case SO_DONTROUTE:
c0ef877b 769 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
0fbe82e6 770 sk_dst_reset(sk);
e71a4783
SH		 771 break;
772 case SO_BROADCAST:
773 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
774 break;
775 case SO_SNDBUF:
776 /* Don't error on this BSD doesn't and if you think
82981930
ED		 777 * about it this is right. Otherwise apps have to
778 * play 'guess the biggest size' games. RCVBUF/SNDBUF
779 * are treated in BSD as hints
780 */
781 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 782set_sndbuf:
4057765f
GN		 783 /* Ensure val * 2 fits into an int, to prevent max_t()
784 * from treating it as a negative value.
785 */
786 val = min_t(int, val, INT_MAX / 2);
e71a4783 787 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
b98b0bc8 788 sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF);
82981930 789 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 790 sk->sk_write_space(sk);
791 break;
1da177e4 792
e71a4783
SH		 793 case SO_SNDBUFFORCE:
794 if (!capable(CAP_NET_ADMIN)) {
795 ret = -EPERM;
796 break;
797 }
4057765f
GN		 798
799 /* No negative values (to prevent underflow, as val will be
800 * multiplied by 2).
801 */
802 if (val < 0)
803 val = 0;
e71a4783 804 goto set_sndbuf;
b0573dea 805
e71a4783
SH		 806 case SO_RCVBUF:
807 /* Don't error on this BSD doesn't and if you think
82981930
ED		 808 * about it this is right. Otherwise apps have to
809 * play 'guess the biggest size' games. RCVBUF/SNDBUF
810 * are treated in BSD as hints
811 */
812 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 813set_rcvbuf:
4057765f
GN		 814 /* Ensure val * 2 fits into an int, to prevent max_t()
815 * from treating it as a negative value.
816 */
817 val = min_t(int, val, INT_MAX / 2);
e71a4783
SH		 818 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
819 /*
820 * We double it on the way in to account for
821 * "struct sk_buff" etc. overhead. Applications
822 * assume that the SO_RCVBUF setting they make will
823 * allow that much actual data to be received on that
824 * socket.
825 *
826 * Applications are unaware that "struct sk_buff" and
827 * other overheads allocate from the receive buffer
828 * during socket buffer allocation.
829 *
830 * And after considering the possible alternatives,
831 * returning the value we actually used in getsockopt
832 * is the most desirable behavior.
833 */
b98b0bc8 834 sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 835 break;
836
837 case SO_RCVBUFFORCE:
838 if (!capable(CAP_NET_ADMIN)) {
839 ret = -EPERM;
1da177e4 840 break;
e71a4783 841 }
4057765f
GN		 842
843 /* No negative values (to prevent underflow, as val will be
844 * multiplied by 2).
845 */
846 if (val < 0)
847 val = 0;
e71a4783 848 goto set_rcvbuf;
1da177e4 849
e71a4783 850 case SO_KEEPALIVE:
4b9d07a4
UB		 851 if (sk->sk_prot->keepalive)
852 sk->sk_prot->keepalive(sk, valbool);
e71a4783
SH		 853 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
854 break;
855
856 case SO_OOBINLINE:
857 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
858 break;
859
860 case SO_NO_CHECK:
28448b80 861 sk->sk_no_check_tx = valbool;
e71a4783
SH		 862 break;
863
864 case SO_PRIORITY:
5e1fccc0
EB		 865 if ((val >= 0 && val <= 6) ||
866 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 867 sk->sk_priority = val;
868 else
869 ret = -EPERM;
870 break;
871
872 case SO_LINGER:
873 if (optlen < sizeof(ling)) {
874 ret = -EINVAL; /* 1003.1g */
1da177e4 875 break;
e71a4783 876 }
2a91525c 877 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 878 ret = -EFAULT;
1da177e4 879 break;
e71a4783
SH		 880 }
881 if (!ling.l_onoff)
882 sock_reset_flag(sk, SOCK_LINGER);
883 else {
1da177e4 884#if (BITS_PER_LONG == 32)
e71a4783
SH		 885 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
886 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 887 else
e71a4783
SH		 888#endif
889 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
890 sock_set_flag(sk, SOCK_LINGER);
891 }
892 break;
893
894 case SO_BSDCOMPAT:
895 sock_warn_obsolete_bsdism("setsockopt");
896 break;
897
898 case SO_PASSCRED:
899 if (valbool)
900 set_bit(SOCK_PASSCRED, &sock->flags);
901 else
902 clear_bit(SOCK_PASSCRED, &sock->flags);
903 break;
904
7f1bc6e9 905 case SO_TIMESTAMP_OLD:
887feae3 906 case SO_TIMESTAMP_NEW:
7f1bc6e9 907 case SO_TIMESTAMPNS_OLD:
887feae3 908 case SO_TIMESTAMPNS_NEW:
e71a4783 909 if (valbool) {
887feae3
DD		 910 if (optname == SO_TIMESTAMP_NEW || optname == SO_TIMESTAMPNS_NEW)
911 sock_set_flag(sk, SOCK_TSTAMP_NEW);
912 else
913 sock_reset_flag(sk, SOCK_TSTAMP_NEW);
914
915 if (optname == SO_TIMESTAMP_OLD || optname == SO_TIMESTAMP_NEW)
92f37fd2
ED		 916 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
917 else
918 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 919 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 920 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 921 } else {
e71a4783 922 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2 923 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
887feae3 924 sock_reset_flag(sk, SOCK_TSTAMP_NEW);
92f37fd2 925 }
e71a4783
SH		 926 break;
927
9718475e
DD		 928 case SO_TIMESTAMPING_NEW:
929 sock_set_flag(sk, SOCK_TSTAMP_NEW);
ff7653f9 930 /* fall through */
7f1bc6e9 931 case SO_TIMESTAMPING_OLD:
20d49473 932 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 933 ret = -EINVAL;
20d49473
PO		 934 break;
935 }
b245be1f 936
09c2d251 937 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765 938 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
ac5cc977
WC		 939 if (sk->sk_protocol == IPPROTO_TCP &&
940 sk->sk_type == SOCK_STREAM) {
6db8b963
SHY		 941 if ((1 << sk->sk_state) &
942 (TCPF_CLOSE | TCPF_LISTEN)) {
4ed2d765
WB		 943 ret = -EINVAL;
944 break;
945 }
946 sk->sk_tskey = tcp_sk(sk)->snd_una;
947 } else {
948 sk->sk_tskey = 0;
949 }
950 }
1c885808
FY		 951
952 if (val & SOF_TIMESTAMPING_OPT_STATS &&
953 !(val & SOF_TIMESTAMPING_OPT_TSONLY)) {
954 ret = -EINVAL;
955 break;
956 }
957
b9f40e21 958 sk->sk_tsflags = val;
20d49473
PO		 959 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
960 sock_enable_timestamp(sk,
961 SOCK_TIMESTAMPING_RX_SOFTWARE);
9718475e
DD		 962 else {
963 if (optname == SO_TIMESTAMPING_NEW)
964 sock_reset_flag(sk, SOCK_TSTAMP_NEW);
965
20d49473 966 sock_disable_timestamp(sk,
08e29af3 967 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
9718475e 968 }
20d49473
PO		 969 break;
970
e71a4783
SH		 971 case SO_RCVLOWAT:
972 if (val < 0)
973 val = INT_MAX;
d1361840
ED		 974 if (sock->ops->set_rcvlowat)
975 ret = sock->ops->set_rcvlowat(sk, val);
976 else
eac66402 977 WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
e71a4783
SH		 978 break;
979
45bdc661 980 case SO_RCVTIMEO_OLD:
a9beb86a
DD		 981 case SO_RCVTIMEO_NEW:
982 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen, optname == SO_RCVTIMEO_OLD);
e71a4783
SH		 983 break;
984
45bdc661 985 case SO_SNDTIMEO_OLD:
a9beb86a
DD		 986 case SO_SNDTIMEO_NEW:
987 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen, optname == SO_SNDTIMEO_OLD);
e71a4783 988 break;
1da177e4 989
e71a4783
SH		 990 case SO_ATTACH_FILTER:
991 ret = -EINVAL;
992 if (optlen == sizeof(struct sock_fprog)) {
993 struct sock_fprog fprog;
1da177e4 994
e71a4783
SH		 995 ret = -EFAULT;
996 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 997 break;
e71a4783
SH		 998
999 ret = sk_attach_filter(&fprog, sk);
1000 }
1001 break;
1002
89aa0758
AS		 1003 case SO_ATTACH_BPF:
1004 ret = -EINVAL;
1005 if (optlen == sizeof(u32)) {
1006 u32 ufd;
1007
1008 ret = -EFAULT;
1009 if (copy_from_user(&ufd, optval, sizeof(ufd)))
1010 break;
1011
1012 ret = sk_attach_bpf(ufd, sk);
1013 }
1014 break;
1015
538950a1
CG		 1016 case SO_ATTACH_REUSEPORT_CBPF:
1017 ret = -EINVAL;
1018 if (optlen == sizeof(struct sock_fprog)) {
1019 struct sock_fprog fprog;
1020
1021 ret = -EFAULT;
1022 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1023 break;
1024
1025 ret = sk_reuseport_attach_filter(&fprog, sk);
1026 }
1027 break;
1028
1029 case SO_ATTACH_REUSEPORT_EBPF:
1030 ret = -EINVAL;
1031 if (optlen == sizeof(u32)) {
1032 u32 ufd;
1033
1034 ret = -EFAULT;
1035 if (copy_from_user(&ufd, optval, sizeof(ufd)))
1036 break;
1037
1038 ret = sk_reuseport_attach_bpf(ufd, sk);
1039 }
1040 break;
1041
99f3a064
MKL		 1042 case SO_DETACH_REUSEPORT_BPF:
1043 ret = reuseport_detach_prog(sk);
1044 break;
1045
e71a4783 1046 case SO_DETACH_FILTER:
55b33325 1047 ret = sk_detach_filter(sk);
e71a4783 1048 break;
1da177e4 1049
d59577b6
VB		 1050 case SO_LOCK_FILTER:
1051 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
1052 ret = -EPERM;
1053 else
1054 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
1055 break;
1056
e71a4783
SH		 1057 case SO_PASSSEC:
1058 if (valbool)
1059 set_bit(SOCK_PASSSEC, &sock->flags);
1060 else
1061 clear_bit(SOCK_PASSSEC, &sock->flags);
1062 break;
4a19ec58 1063 case SO_MARK:
50254256 1064 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
4a19ec58 1065 ret = -EPERM;
50254256 1066 } else if (val != sk->sk_mark) {
4a19ec58 1067 sk->sk_mark = val;
50254256
DB		 1068 sk_dst_reset(sk);
1069 }
4a19ec58 1070 break;
877ce7c1 1071
3b885787 1072 case SO_RXQ_OVFL:
8083f0fc 1073 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 1074 break;
6e3e939f
JB		 1075
1076 case SO_WIFI_STATUS:
1077 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
1078 break;
1079
ef64a54f
PE		 1080 case SO_PEEK_OFF:
1081 if (sock->ops->set_peek_off)
12663bfc 1082 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 1083 else
1084 ret = -EOPNOTSUPP;
1085 break;
3bdc0eba
BG		 1086
1087 case SO_NOFCS:
1088 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
1089 break;
1090
7d4c04fc
KJ		 1091 case SO_SELECT_ERR_QUEUE:
1092 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
1093 break;
1094
e0d1095a 1095#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1096 case SO_BUSY_POLL:
dafcc438
ET		 1097 /* allow unprivileged users to decrease the value */
1098 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
1099 ret = -EPERM;
1100 else {
1101 if (val < 0)
1102 ret = -EINVAL;
1103 else
1104 sk->sk_ll_usec = val;
1105 }
1106 break;
1107#endif
62748f32
ED		 1108
1109 case SO_MAX_PACING_RATE:
6bdef102
ED		 1110 {
1111 unsigned long ulval = (val == ~0U) ? ~0UL : val;
1112
1113 if (sizeof(ulval) != sizeof(val) &&
1114 optlen >= sizeof(ulval) &&
1115 get_user(ulval, (unsigned long __user *)optval)) {
1116 ret = -EFAULT;
1117 break;
1118 }
1119 if (ulval != ~0UL)
218af599
ED		 1120 cmpxchg(&sk->sk_pacing_status,
1121 SK_PACING_NONE,
1122 SK_PACING_NEEDED);
6bdef102
ED		 1123 sk->sk_max_pacing_rate = ulval;
1124 sk->sk_pacing_rate = min(sk->sk_pacing_rate, ulval);
62748f32 1125 break;
6bdef102 1126 }
70da268b
ED		 1127 case SO_INCOMING_CPU:
1128 sk->sk_incoming_cpu = val;
1129 break;
1130
a87cb3e4
TH		 1131 case SO_CNX_ADVICE:
1132 if (val == 1)
1133 dst_negative_advice(sk);
1134 break;
76851d12
WB		 1135
1136 case SO_ZEROCOPY:
28190752 1137 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) {
b5947e5d
WB		 1138 if (!((sk->sk_type == SOCK_STREAM &&
1139 sk->sk_protocol == IPPROTO_TCP) ||
1140 (sk->sk_type == SOCK_DGRAM &&
1141 sk->sk_protocol == IPPROTO_UDP)))
28190752 1142 ret = -ENOTSUPP;
28190752 1143 } else if (sk->sk_family != PF_RDS) {
76851d12 1144 ret = -ENOTSUPP;
28190752
SV		 1145 }
1146 if (!ret) {
1147 if (val < 0 || val > 1)
1148 ret = -EINVAL;
1149 else
1150 sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool);
28190752 1151 }
334e6413
JSP		 1152 break;
1153
80b14dee
RC		 1154 case SO_TXTIME:
1155 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1156 ret = -EPERM;
1157 } else if (optlen != sizeof(struct sock_txtime)) {
1158 ret = -EINVAL;
1159 } else if (copy_from_user(&sk_txtime, optval,
1160 sizeof(struct sock_txtime))) {
1161 ret = -EFAULT;
1162 } else if (sk_txtime.flags & ~SOF_TXTIME_FLAGS_MASK) {
1163 ret = -EINVAL;
1164 } else {
1165 sock_valbool_flag(sk, SOCK_TXTIME, true);
1166 sk->sk_clockid = sk_txtime.clockid;
1167 sk->sk_txtime_deadline_mode =
1168 !!(sk_txtime.flags & SOF_TXTIME_DEADLINE_MODE);
4b15c707
JSP		 1169 sk->sk_txtime_report_errors =
1170 !!(sk_txtime.flags & SOF_TXTIME_REPORT_ERRORS);
80b14dee
RC		 1171 }
1172 break;
1173
f5dd3d0c
DH		 1174 case SO_BINDTOIFINDEX:
1175 ret = sock_setbindtodevice_locked(sk, val);
1176 break;
1177
e71a4783
SH		 1178 default:
1179 ret = -ENOPROTOOPT;
1180 break;
4ec93edb 1181 }
1da177e4
LT		 1182 release_sock(sk);
1183 return ret;
1184}
2a91525c 1185EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 1186
1187
8f09898b 1188static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1189 struct ucred *ucred)
3f551f94
EB		 1190{
1191 ucred->pid = pid_vnr(pid);
1192 ucred->uid = ucred->gid = -1;
1193 if (cred) {
1194 struct user_namespace *current_ns = current_user_ns();
1195
b2e4f544
EB		 1196 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1197 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 1198 }
1199}
1200
28b5ba2a
DH		 1201static int groups_to_user(gid_t __user *dst, const struct group_info *src)
1202{
1203 struct user_namespace *user_ns = current_user_ns();
1204 int i;
1205
1206 for (i = 0; i < src->ngroups; i++)
1207 if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i))
1208 return -EFAULT;
1209
1210 return 0;
1211}
1212
1da177e4
LT		 1213int sock_getsockopt(struct socket *sock, int level, int optname,
1214 char __user *optval, int __user *optlen)
1215{
1216 struct sock *sk = sock->sk;
4ec93edb 1217
e71a4783 1218 union {
4ec93edb 1219 int val;
5daab9db 1220 u64 val64;
677f136c 1221 unsigned long ulval;
4ec93edb 1222 struct linger ling;
fe0c72f3
AB		 1223 struct old_timeval32 tm32;
1224 struct __kernel_old_timeval tm;
a9beb86a 1225 struct __kernel_sock_timeval stm;
80b14dee 1226 struct sock_txtime txtime;
1da177e4 1227 } v;
4ec93edb 1228
4d0392be 1229 int lv = sizeof(int);
1da177e4 1230 int len;
4ec93edb 1231
e71a4783 1232 if (get_user(len, optlen))
4ec93edb 1233 return -EFAULT;
e71a4783 1234 if (len < 0)
1da177e4 1235 return -EINVAL;
4ec93edb 1236
50fee1de 1237 memset(&v, 0, sizeof(v));
df0bca04 1238
2a91525c 1239 switch (optname) {
e71a4783
SH		 1240 case SO_DEBUG:
1241 v.val = sock_flag(sk, SOCK_DBG);
1242 break;
1243
1244 case SO_DONTROUTE:
1245 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1246 break;
1247
1248 case SO_BROADCAST:
1b23a5df 1249 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1250 break;
1251
1252 case SO_SNDBUF:
1253 v.val = sk->sk_sndbuf;
1254 break;
1255
1256 case SO_RCVBUF:
1257 v.val = sk->sk_rcvbuf;
1258 break;
1259
1260 case SO_REUSEADDR:
1261 v.val = sk->sk_reuse;
1262 break;
1263
055dc21a
TH		 1264 case SO_REUSEPORT:
1265 v.val = sk->sk_reuseport;
1266 break;
1267
e71a4783 1268 case SO_KEEPALIVE:
1b23a5df 1269 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1270 break;
1271
1272 case SO_TYPE:
1273 v.val = sk->sk_type;
1274 break;
1275
49c794e9
JE		 1276 case SO_PROTOCOL:
1277 v.val = sk->sk_protocol;
1278 break;
1279
0d6038ee
JE		 1280 case SO_DOMAIN:
1281 v.val = sk->sk_family;
1282 break;
1283
e71a4783
SH		 1284 case SO_ERROR:
1285 v.val = -sock_error(sk);
2a91525c 1286 if (v.val == 0)
e71a4783
SH		 1287 v.val = xchg(&sk->sk_err_soft, 0);
1288 break;
1289
1290 case SO_OOBINLINE:
1b23a5df 1291 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1292 break;
1293
1294 case SO_NO_CHECK:
28448b80 1295 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1296 break;
1297
1298 case SO_PRIORITY:
1299 v.val = sk->sk_priority;
1300 break;
1301
1302 case SO_LINGER:
1303 lv = sizeof(v.ling);
1b23a5df 1304 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1305 v.ling.l_linger = sk->sk_lingertime / HZ;
1306 break;
1307
1308 case SO_BSDCOMPAT:
1309 sock_warn_obsolete_bsdism("getsockopt");
1310 break;
1311
7f1bc6e9 1312 case SO_TIMESTAMP_OLD:
92f37fd2 1313 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
887feae3 1314 !sock_flag(sk, SOCK_TSTAMP_NEW) &&
92f37fd2
ED		 1315 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1316 break;
1317
7f1bc6e9 1318 case SO_TIMESTAMPNS_OLD:
887feae3
DD		 1319 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && !sock_flag(sk, SOCK_TSTAMP_NEW);
1320 break;
1321
1322 case SO_TIMESTAMP_NEW:
1323 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && sock_flag(sk, SOCK_TSTAMP_NEW);
1324 break;
1325
1326 case SO_TIMESTAMPNS_NEW:
1327 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && sock_flag(sk, SOCK_TSTAMP_NEW);
e71a4783
SH		 1328 break;
1329
7f1bc6e9 1330 case SO_TIMESTAMPING_OLD:
b9f40e21 1331 v.val = sk->sk_tsflags;
20d49473
PO		 1332 break;
1333
a9beb86a
DD		 1334 case SO_RCVTIMEO_OLD:
1335 case SO_RCVTIMEO_NEW:
1336 lv = sock_get_timeout(sk->sk_rcvtimeo, &v, SO_RCVTIMEO_OLD == optname);
e71a4783
SH		 1337 break;
1338
a9beb86a
DD		 1339 case SO_SNDTIMEO_OLD:
1340 case SO_SNDTIMEO_NEW:
1341 lv = sock_get_timeout(sk->sk_sndtimeo, &v, SO_SNDTIMEO_OLD == optname);
e71a4783 1342 break;
1da177e4 1343
e71a4783
SH		 1344 case SO_RCVLOWAT:
1345 v.val = sk->sk_rcvlowat;
1346 break;
1da177e4 1347
e71a4783 1348 case SO_SNDLOWAT:
2a91525c 1349 v.val = 1;
e71a4783 1350 break;
1da177e4 1351
e71a4783 1352 case SO_PASSCRED:
82981930 1353 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1354 break;
1da177e4 1355
e71a4783 1356 case SO_PEERCRED:
109f6e39
EB		 1357 {
1358 struct ucred peercred;
1359 if (len > sizeof(peercred))
1360 len = sizeof(peercred);
1361 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1362 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1363 return -EFAULT;
1364 goto lenout;
109f6e39 1365 }
1da177e4 1366
28b5ba2a
DH		 1367 case SO_PEERGROUPS:
1368 {
1369 int ret, n;
1370
1371 if (!sk->sk_peer_cred)
1372 return -ENODATA;
1373
1374 n = sk->sk_peer_cred->group_info->ngroups;
1375 if (len < n * sizeof(gid_t)) {
1376 len = n * sizeof(gid_t);
1377 return put_user(len, optlen) ? -EFAULT : -ERANGE;
1378 }
1379 len = n * sizeof(gid_t);
1380
1381 ret = groups_to_user((gid_t __user *)optval,
1382 sk->sk_peer_cred->group_info);
1383 if (ret)
1384 return ret;
1385 goto lenout;
1386 }
1387
e71a4783
SH		 1388 case SO_PEERNAME:
1389 {
1390 char address[128];
1391
9b2c45d4
DV		 1392 lv = sock->ops->getname(sock, (struct sockaddr *)address, 2);
1393 if (lv < 0)
e71a4783
SH		 1394 return -ENOTCONN;
1395 if (lv < len)
1396 return -EINVAL;
1397 if (copy_to_user(optval, address, len))
1398 return -EFAULT;
1399 goto lenout;
1400 }
1da177e4 1401
e71a4783
SH		 1402 /* Dubious BSD thing... Probably nobody even uses it, but
1403 * the UNIX standard wants it for whatever reason... -DaveM
1404 */
1405 case SO_ACCEPTCONN:
1406 v.val = sk->sk_state == TCP_LISTEN;
1407 break;
1da177e4 1408
e71a4783 1409 case SO_PASSSEC:
82981930 1410 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1411 break;
877ce7c1 1412
e71a4783
SH		 1413 case SO_PEERSEC:
1414 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1415
4a19ec58
LAT		 1416 case SO_MARK:
1417 v.val = sk->sk_mark;
1418 break;
1419
3b885787 1420 case SO_RXQ_OVFL:
1b23a5df 1421 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1422 break;
1423
6e3e939f 1424 case SO_WIFI_STATUS:
1b23a5df 1425 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1426 break;
1427
ef64a54f
PE		 1428 case SO_PEEK_OFF:
1429 if (!sock->ops->set_peek_off)
1430 return -EOPNOTSUPP;
1431
1432 v.val = sk->sk_peek_off;
1433 break;
bc2f7996 1434 case SO_NOFCS:
1b23a5df 1435 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1436 break;
c91f6df2 1437
f7b86bfe 1438 case SO_BINDTODEVICE:
c91f6df2
BH		 1439 return sock_getbindtodevice(sk, optval, optlen, len);
1440
a8fc9277
PE		 1441 case SO_GET_FILTER:
1442 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1443 if (len < 0)
1444 return len;
1445
1446 goto lenout;
c91f6df2 1447
d59577b6
VB		 1448 case SO_LOCK_FILTER:
1449 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1450 break;
1451
ea02f941
MS		 1452 case SO_BPF_EXTENSIONS:
1453 v.val = bpf_tell_extensions();
1454 break;
1455
7d4c04fc
KJ		 1456 case SO_SELECT_ERR_QUEUE:
1457 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1458 break;
1459
e0d1095a 1460#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1461 case SO_BUSY_POLL:
dafcc438
ET		 1462 v.val = sk->sk_ll_usec;
1463 break;
1464#endif
1465
62748f32 1466 case SO_MAX_PACING_RATE:
677f136c
ED		 1467 if (sizeof(v.ulval) != sizeof(v.val) && len >= sizeof(v.ulval)) {
1468 lv = sizeof(v.ulval);
1469 v.ulval = sk->sk_max_pacing_rate;
1470 } else {
1471 /* 32bit version */
1472 v.val = min_t(unsigned long, sk->sk_max_pacing_rate, ~0U);
1473 }
62748f32
ED		 1474 break;
1475
2c8c56e1
ED		 1476 case SO_INCOMING_CPU:
1477 v.val = sk->sk_incoming_cpu;
1478 break;
1479
a2d133b1
JH		 1480 case SO_MEMINFO:
1481 {
1482 u32 meminfo[SK_MEMINFO_VARS];
1483
a2d133b1
JH		 1484 sk_get_meminfo(sk, meminfo);
1485
1486 len = min_t(unsigned int, len, sizeof(meminfo));
1487 if (copy_to_user(optval, &meminfo, len))
1488 return -EFAULT;
1489
1490 goto lenout;
1491 }
6d433902
SS		 1492
1493#ifdef CONFIG_NET_RX_BUSY_POLL
1494 case SO_INCOMING_NAPI_ID:
1495 v.val = READ_ONCE(sk->sk_napi_id);
1496
1497 /* aggregate non-NAPI IDs down to 0 */
1498 if (v.val < MIN_NAPI_ID)
1499 v.val = 0;
1500
1501 break;
1502#endif
1503
5daab9db
CF		 1504 case SO_COOKIE:
1505 lv = sizeof(u64);
1506 if (len < lv)
1507 return -EINVAL;
1508 v.val64 = sock_gen_cookie(sk);
1509 break;
1510
76851d12
WB		 1511 case SO_ZEROCOPY:
1512 v.val = sock_flag(sk, SOCK_ZEROCOPY);
1513 break;
1514
80b14dee
RC		 1515 case SO_TXTIME:
1516 lv = sizeof(v.txtime);
1517 v.txtime.clockid = sk->sk_clockid;
1518 v.txtime.flags |= sk->sk_txtime_deadline_mode ?
1519 SOF_TXTIME_DEADLINE_MODE : 0;
4b15c707
JSP		 1520 v.txtime.flags |= sk->sk_txtime_report_errors ?
1521 SOF_TXTIME_REPORT_ERRORS : 0;
80b14dee
RC		 1522 break;
1523
f5dd3d0c
DH		 1524 case SO_BINDTOIFINDEX:
1525 v.val = sk->sk_bound_dev_if;
1526 break;
1527
e71a4783 1528 default:
443b5991
YH		 1529 /* We implement the SO_SNDLOWAT etc to not be settable
1530 * (1003.1g 7).
1531 */
e71a4783 1532 return -ENOPROTOOPT;
1da177e4 1533 }
e71a4783 1534
1da177e4
LT		 1535 if (len > lv)
1536 len = lv;
1537 if (copy_to_user(optval, &v, len))
1538 return -EFAULT;
1539lenout:
4ec93edb
YH		 1540 if (put_user(len, optlen))
1541 return -EFAULT;
1542 return 0;
1da177e4
LT		 1543}
1544
a5b5bb9a
IM		 1545/*
1546 * Initialize an sk_lock.
1547 *
1548 * (We also register the sk_lock with the lock validator.)
1549 */
b6f99a21 1550static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1551{
cdfbabfb
DH		 1552 if (sk->sk_kern_sock)
1553 sock_lock_init_class_and_name(
1554 sk,
1555 af_family_kern_slock_key_strings[sk->sk_family],
1556 af_family_kern_slock_keys + sk->sk_family,
1557 af_family_kern_key_strings[sk->sk_family],
1558 af_family_kern_keys + sk->sk_family);
1559 else
1560 sock_lock_init_class_and_name(
1561 sk,
ed07536e
PZ		 1562 af_family_slock_key_strings[sk->sk_family],
1563 af_family_slock_keys + sk->sk_family,
1564 af_family_key_strings[sk->sk_family],
1565 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1566}
1567
4dc6dc71
ED		 1568/*
1569 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1570 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1571 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1572 */
f1a6c4da
PE		 1573static void sock_copy(struct sock *nsk, const struct sock *osk)
1574{
1575#ifdef CONFIG_SECURITY_NETWORK
1576 void *sptr = nsk->sk_security;
1577#endif
68835aba
ED		 1578 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1579
1580 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1581 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1582
f1a6c4da
PE		 1583#ifdef CONFIG_SECURITY_NETWORK
1584 nsk->sk_security = sptr;
1585 security_sk_clone(osk, nsk);
1586#endif
1587}
1588
2e4afe7b
PE		 1589static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1590 int family)
c308c1b2
PE		 1591{
1592 struct sock *sk;
1593 struct kmem_cache *slab;
1594
1595 slab = prot->slab;
e912b114
ED		 1596 if (slab != NULL) {
1597 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1598 if (!sk)
1599 return sk;
6471384a 1600 if (want_init_on_alloc(priority))
ba2489b0 1601 sk_prot_clear_nulls(sk, prot->obj_size);
fcbdf09d 1602 } else
c308c1b2
PE		 1603 sk = kmalloc(prot->obj_size, priority);
1604
2e4afe7b
PE		 1605 if (sk != NULL) {
1606 if (security_sk_alloc(sk, family, priority))
1607 goto out_free;
1608
1609 if (!try_module_get(prot->owner))
1610 goto out_free_sec;
e022f0b4 1611 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1612 }
1613
c308c1b2 1614 return sk;
2e4afe7b
PE		 1615
1616out_free_sec:
1617 security_sk_free(sk);
1618out_free:
1619 if (slab != NULL)
1620 kmem_cache_free(slab, sk);
1621 else
1622 kfree(sk);
1623 return NULL;
c308c1b2
PE		 1624}
1625
1626static void sk_prot_free(struct proto *prot, struct sock *sk)
1627{
1628 struct kmem_cache *slab;
2e4afe7b 1629 struct module *owner;
c308c1b2 1630
2e4afe7b 1631 owner = prot->owner;
c308c1b2 1632 slab = prot->slab;
2e4afe7b 1633
bd1060a1 1634 cgroup_sk_free(&sk->sk_cgrp_data);
2d758073 1635 mem_cgroup_sk_free(sk);
2e4afe7b 1636 security_sk_free(sk);
c308c1b2
PE		 1637 if (slab != NULL)
1638 kmem_cache_free(slab, sk);
1639 else
1640 kfree(sk);
2e4afe7b 1641 module_put(owner);
c308c1b2
PE		 1642}
1643
1da177e4
LT		 1644/**
1645 * sk_alloc - All socket objects are allocated here
c4ea43c5 1646 * @net: the applicable net namespace
4dc3b16b
PP		 1647 * @family: protocol family
1648 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1649 * @prot: struct proto associated with this new sock instance
11aa9c28 1650 * @kern: is this to be a kernel socket?
1da177e4 1651 */
1b8d7ae4 1652struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
11aa9c28 1653 struct proto *prot, int kern)
1da177e4 1654{
c308c1b2 1655 struct sock *sk;
1da177e4 1656
154adbc8 1657 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1658 if (sk) {
154adbc8
PE		 1659 sk->sk_family = family;
1660 /*
1661 * See comment in struct sock definition to understand
1662 * why we need sk_prot_creator -acme
1663 */
1664 sk->sk_prot = sk->sk_prot_creator = prot;
cdfbabfb 1665 sk->sk_kern_sock = kern;
154adbc8 1666 sock_lock_init(sk);
26abe143 1667 sk->sk_net_refcnt = kern ? 0 : 1;
648845ab 1668 if (likely(sk->sk_net_refcnt)) {
26abe143 1669 get_net(net);
648845ab
TZ		 1670 sock_inuse_add(net, 1);
1671 }
1672
26abe143 1673 sock_net_set(sk, net);
14afee4b 1674 refcount_set(&sk->sk_wmem_alloc, 1);
f8451725 1675
2d758073 1676 mem_cgroup_sk_alloc(sk);
d979a39d 1677 cgroup_sk_alloc(&sk->sk_cgrp_data);
2a56a1fe
TH		 1678 sock_update_classid(&sk->sk_cgrp_data);
1679 sock_update_netprioidx(&sk->sk_cgrp_data);
1da177e4 1680 }
a79af59e 1681
2e4afe7b 1682 return sk;
1da177e4 1683}
2a91525c 1684EXPORT_SYMBOL(sk_alloc);
1da177e4 1685
a4298e45
ED		 1686/* Sockets having SOCK_RCU_FREE will call this function after one RCU
1687 * grace period. This is the case for UDP sockets and TCP listeners.
1688 */
1689static void __sk_destruct(struct rcu_head *head)
1da177e4 1690{
a4298e45 1691 struct sock *sk = container_of(head, struct sock, sk_rcu);
1da177e4 1692 struct sk_filter *filter;
1da177e4
LT		 1693
1694 if (sk->sk_destruct)
1695 sk->sk_destruct(sk);
1696
a898def2 1697 filter = rcu_dereference_check(sk->sk_filter,
14afee4b 1698 refcount_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1699 if (filter) {
309dd5fc 1700 sk_filter_uncharge(sk, filter);
a9b3cd7f 1701 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1702 }
1703
08e29af3 1704 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4 1705
6ac99e8f
MKL		 1706#ifdef CONFIG_BPF_SYSCALL
1707 bpf_sk_storage_free(sk);
1708#endif
1709
1da177e4 1710 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1711 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1712 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1713
22a0e18e
ED		 1714 if (sk->sk_frag.page) {
1715 put_page(sk->sk_frag.page);
1716 sk->sk_frag.page = NULL;
1717 }
1718
109f6e39
EB		 1719 if (sk->sk_peer_cred)
1720 put_cred(sk->sk_peer_cred);
1721 put_pid(sk->sk_peer_pid);
26abe143
EB		 1722 if (likely(sk->sk_net_refcnt))
1723 put_net(sock_net(sk));
c308c1b2 1724 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1725}
2b85a34e 1726
a4298e45
ED		 1727void sk_destruct(struct sock *sk)
1728{
8c7138b3
MKL		 1729 bool use_call_rcu = sock_flag(sk, SOCK_RCU_FREE);
1730
1731 if (rcu_access_pointer(sk->sk_reuseport_cb)) {
1732 reuseport_detach_sock(sk);
1733 use_call_rcu = true;
1734 }
1735
1736 if (use_call_rcu)
a4298e45
ED		 1737 call_rcu(&sk->sk_rcu, __sk_destruct);
1738 else
1739 __sk_destruct(&sk->sk_rcu);
1740}
1741
eb4cb008
CG		 1742static void __sk_free(struct sock *sk)
1743{
648845ab
TZ		 1744 if (likely(sk->sk_net_refcnt))
1745 sock_inuse_add(sock_net(sk), -1);
1746
9709020c 1747 if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk)))
eb4cb008
CG		 1748 sock_diag_broadcast_destroy(sk);
1749 else
1750 sk_destruct(sk);
1751}
1752
2b85a34e
ED		 1753void sk_free(struct sock *sk)
1754{
1755 /*
25985edc 1756 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1757 * some packets are still in some tx queue.
1758 * If not null, sock_wfree() will call __sk_free(sk) later
1759 */
14afee4b 1760 if (refcount_dec_and_test(&sk->sk_wmem_alloc))
2b85a34e
ED		 1761 __sk_free(sk);
1762}
2a91525c 1763EXPORT_SYMBOL(sk_free);
1da177e4 1764
581319c5
PA		 1765static void sk_init_common(struct sock *sk)
1766{
1767 skb_queue_head_init(&sk->sk_receive_queue);
1768 skb_queue_head_init(&sk->sk_write_queue);
1769 skb_queue_head_init(&sk->sk_error_queue);
1770
1771 rwlock_init(&sk->sk_callback_lock);
1772 lockdep_set_class_and_name(&sk->sk_receive_queue.lock,
1773 af_rlock_keys + sk->sk_family,
1774 af_family_rlock_key_strings[sk->sk_family]);
1775 lockdep_set_class_and_name(&sk->sk_write_queue.lock,
1776 af_wlock_keys + sk->sk_family,
1777 af_family_wlock_key_strings[sk->sk_family]);
1778 lockdep_set_class_and_name(&sk->sk_error_queue.lock,
1779 af_elock_keys + sk->sk_family,
1780 af_family_elock_key_strings[sk->sk_family]);
1781 lockdep_set_class_and_name(&sk->sk_callback_lock,
1782 af_callback_keys + sk->sk_family,
1783 af_family_clock_key_strings[sk->sk_family]);
1784}
1785
e56c57d0
ED		 1786/**
1787 * sk_clone_lock - clone a socket, and lock its clone
1788 * @sk: the socket to clone
1789 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1790 *
1791 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1792 */
1793struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1794{
8fd1d178 1795 struct sock *newsk;
278571ba 1796 bool is_charged = true;
87d11ceb 1797
8fd1d178 1798 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1799 if (newsk != NULL) {
1800 struct sk_filter *filter;
1801
892c141e 1802 sock_copy(newsk, sk);
87d11ceb 1803
9d538fa6
CP		 1804 newsk->sk_prot_creator = sk->sk_prot;
1805
87d11ceb 1806 /* SANITY */
8a681736
SV		 1807 if (likely(newsk->sk_net_refcnt))
1808 get_net(sock_net(newsk));
87d11ceb
ACM		 1809 sk_node_init(&newsk->sk_node);
1810 sock_lock_init(newsk);
1811 bh_lock_sock(newsk);
fa438ccf 1812 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1813 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1814
1815 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1816 /*
1817 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1818 */
14afee4b 1819 refcount_set(&newsk->sk_wmem_alloc, 1);
87d11ceb 1820 atomic_set(&newsk->sk_omem_alloc, 0);
581319c5 1821 sk_init_common(newsk);
87d11ceb
ACM		 1822
1823 newsk->sk_dst_cache = NULL;
9b8805a3 1824 newsk->sk_dst_pending_confirm = 0;
87d11ceb
ACM		 1825 newsk->sk_wmem_queued = 0;
1826 newsk->sk_forward_alloc = 0;
9caad864 1827 atomic_set(&newsk->sk_drops, 0);
87d11ceb 1828 newsk->sk_send_head = NULL;
87d11ceb 1829 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
52267790 1830 atomic_set(&newsk->sk_zckey, 0);
87d11ceb
ACM		 1831
1832 sock_reset_flag(newsk, SOCK_DONE);
edbe69ef 1833 mem_cgroup_sk_alloc(newsk);
c0576e39 1834 cgroup_sk_alloc(&newsk->sk_cgrp_data);
87d11ceb 1835
eefca20e
ED		 1836 rcu_read_lock();
1837 filter = rcu_dereference(sk->sk_filter);
87d11ceb 1838 if (filter != NULL)
278571ba
AS		 1839 /* though it's an empty new sock, the charging may fail
1840 * if sysctl_optmem_max was changed between creation of
1841 * original socket and cloning
1842 */
1843 is_charged = sk_filter_charge(newsk, filter);
eefca20e
ED		 1844 RCU_INIT_POINTER(newsk->sk_filter, filter);
1845 rcu_read_unlock();
87d11ceb 1846
d188ba86 1847 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
a97e50cc
DB		 1848 /* We need to make sure that we don't uncharge the new
1849 * socket if we couldn't charge it in the first place
1850 * as otherwise we uncharge the parent's filter.
1851 */
1852 if (!is_charged)
1853 RCU_INIT_POINTER(newsk->sk_filter, NULL);
94352d45 1854 sk_free_unlock_clone(newsk);
87d11ceb
ACM		 1855 newsk = NULL;
1856 goto out;
1857 }
fa463497 1858 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
8f51dfc7
SF		 1859
1860 if (bpf_sk_storage_clone(sk, newsk)) {
1861 sk_free_unlock_clone(newsk);
1862 newsk = NULL;
1863 goto out;
1864 }
87d11ceb
ACM		 1865
1866 newsk->sk_err = 0;
e551c32d 1867 newsk->sk_err_soft = 0;
87d11ceb 1868 newsk->sk_priority = 0;
2c8c56e1 1869 newsk->sk_incoming_cpu = raw_smp_processor_id();
648845ab
TZ		 1870 if (likely(newsk->sk_net_refcnt))
1871 sock_inuse_add(sock_net(newsk), 1);
d979a39d 1872
4dc6dc71
ED		 1873 /*
1874 * Before updating sk_refcnt, we must commit prior changes to memory
1875 * (Documentation/RCU/rculist_nulls.txt for details)
1876 */
1877 smp_wmb();
41c6d650 1878 refcount_set(&newsk->sk_refcnt, 2);
87d11ceb
ACM		 1879
1880 /*
1881 * Increment the counter in the same struct proto as the master
1882 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1883 * is the same as sk->sk_prot->socks, as this field was copied
1884 * with memcpy).
1885 *
1886 * This _changes_ the previous behaviour, where
1887 * tcp_create_openreq_child always was incrementing the
1888 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1889 * to be taken into account in all callers. -acme
1890 */
1891 sk_refcnt_debug_inc(newsk);
972692e0 1892 sk_set_socket(newsk, NULL);
c2f26e8f 1893 RCU_INIT_POINTER(newsk->sk_wq, NULL);
87d11ceb
ACM		 1894
1895 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1896 sk_sockets_allocated_inc(newsk);
704da560 1897
080a270f
HFS		 1898 if (sock_needs_netstamp(sk) &&
1899 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1900 net_enable_timestamp();
87d11ceb
ACM		 1901 }
1902out:
1903 return newsk;
1904}
e56c57d0 1905EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1906
94352d45
ACM		 1907void sk_free_unlock_clone(struct sock *sk)
1908{
1909 /* It is still raw copy of parent, so invalidate
1910 * destructor and make plain sk_free() */
1911 sk->sk_destruct = NULL;
1912 bh_unlock_sock(sk);
1913 sk_free(sk);
1914}
1915EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
1916
9958089a
AK		 1917void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1918{
d6a4e26a
ED		 1919 u32 max_segs = 1;
1920
6bd4f355 1921 sk_dst_set(sk, dst);
0a6b2a1d 1922 sk->sk_route_caps = dst->dev->features | sk->sk_route_forced_caps;
9958089a 1923 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1924 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1925 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1926 if (sk_can_gso(sk)) {
f70f250a 1927 if (dst->header_len && !xfrm_dst_offload_ok(dst)) {
9958089a 1928 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1929 } else {
9958089a 1930 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1931 sk->sk_gso_max_size = dst->dev->gso_max_size;
d6a4e26a 1932 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
82cc1a7a 1933 }
9958089a 1934 }
d6a4e26a 1935 sk->sk_gso_max_segs = max_segs;
9958089a
AK		 1936}
1937EXPORT_SYMBOL_GPL(sk_setup_caps);
1938
1da177e4
LT		 1939/*
1940 * Simple resource managers for sockets.
1941 */
1942
1943
4ec93edb
YH		 1944/*
1945 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1946 */
1947void sock_wfree(struct sk_buff *skb)
1948{
1949 struct sock *sk = skb->sk;
d99927f4 1950 unsigned int len = skb->truesize;
1da177e4 1951
d99927f4
ED		 1952 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1953 /*
1954 * Keep a reference on sk_wmem_alloc, this will be released
1955 * after sk_write_space() call
1956 */
14afee4b 1957 WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc));
1da177e4 1958 sk->sk_write_space(sk);
d99927f4
ED		 1959 len = 1;
1960 }
2b85a34e 1961 /*
d99927f4
ED		 1962 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1963 * could not do because of in-flight packets
2b85a34e 1964 */
14afee4b 1965 if (refcount_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1966 __sk_free(sk);
1da177e4 1967}
2a91525c 1968EXPORT_SYMBOL(sock_wfree);
1da177e4 1969
1d2077ac
ED		 1970/* This variant of sock_wfree() is used by TCP,
1971 * since it sets SOCK_USE_WRITE_QUEUE.
1972 */
1973void __sock_wfree(struct sk_buff *skb)
1974{
1975 struct sock *sk = skb->sk;
1976
14afee4b 1977 if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
1d2077ac
ED		 1978 __sk_free(sk);
1979}
1980
9e17f8a4
ED		 1981void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1982{
1983 skb_orphan(skb);
1984 skb->sk = sk;
1985#ifdef CONFIG_INET
1986 if (unlikely(!sk_fullsock(sk))) {
1987 skb->destructor = sock_edemux;
1988 sock_hold(sk);
1989 return;
1990 }
1991#endif
1992 skb->destructor = sock_wfree;
1993 skb_set_hash_from_sk(skb, sk);
1994 /*
1995 * We used to take a refcount on sk, but following operation
1996 * is enough to guarantee sk_free() wont free this sock until
1997 * all in-flight packets are completed
1998 */
14afee4b 1999 refcount_add(skb->truesize, &sk->sk_wmem_alloc);
9e17f8a4
ED		 2000}
2001EXPORT_SYMBOL(skb_set_owner_w);
2002
41477662
JK		 2003static bool can_skb_orphan_partial(const struct sk_buff *skb)
2004{
2005#ifdef CONFIG_TLS_DEVICE
2006 /* Drivers depend on in-order delivery for crypto offload,
2007 * partial orphan breaks out-of-order-OK logic.
2008 */
2009 if (skb->decrypted)
2010 return false;
2011#endif
2012 return (skb->destructor == sock_wfree ||
2013 (IS_ENABLED(CONFIG_INET) && skb->destructor == tcp_wfree));
2014}
2015
1d2077ac
ED		 2016/* This helper is used by netem, as it can hold packets in its
2017 * delay queue. We want to allow the owner socket to send more
2018 * packets, as if they were already TX completed by a typical driver.
2019 * But we also want to keep skb->sk set because some packet schedulers
f6ba8d33 2020 * rely on it (sch_fq for example).
1d2077ac 2021 */
f2f872f9
ED		 2022void skb_orphan_partial(struct sk_buff *skb)
2023{
f6ba8d33 2024 if (skb_is_tcp_pure_ack(skb))
1d2077ac
ED		 2025 return;
2026
41477662 2027 if (can_skb_orphan_partial(skb)) {
f6ba8d33
ED		 2028 struct sock *sk = skb->sk;
2029
41c6d650 2030 if (refcount_inc_not_zero(&sk->sk_refcnt)) {
14afee4b 2031 WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc));
f6ba8d33
ED		 2032 skb->destructor = sock_efree;
2033 }
f2f872f9
ED		 2034 } else {
2035 skb_orphan(skb);
2036 }
2037}
2038EXPORT_SYMBOL(skb_orphan_partial);
2039
4ec93edb
YH		 2040/*
2041 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 2042 */
2043void sock_rfree(struct sk_buff *skb)
2044{
2045 struct sock *sk = skb->sk;
d361fd59 2046 unsigned int len = skb->truesize;
1da177e4 2047
d361fd59
ED		 2048 atomic_sub(len, &sk->sk_rmem_alloc);
2049 sk_mem_uncharge(sk, len);
1da177e4 2050}
2a91525c 2051EXPORT_SYMBOL(sock_rfree);
1da177e4 2052
7768eed8
OH		 2053/*
2054 * Buffer destructor for skbs that are not used directly in read or write
2055 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
2056 */
62bccb8c
AD		 2057void sock_efree(struct sk_buff *skb)
2058{
2059 sock_put(skb->sk);
2060}
2061EXPORT_SYMBOL(sock_efree);
2062
976d0201 2063kuid_t sock_i_uid(struct sock *sk)
1da177e4 2064{
976d0201 2065 kuid_t uid;
1da177e4 2066
f064af1e 2067 read_lock_bh(&sk->sk_callback_lock);
976d0201 2068 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 2069 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 2070 return uid;
2071}
2a91525c 2072EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 2073
2074unsigned long sock_i_ino(struct sock *sk)
2075{
2076 unsigned long ino;
2077
f064af1e 2078 read_lock_bh(&sk->sk_callback_lock);
1da177e4 2079 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 2080 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 2081 return ino;
2082}
2a91525c 2083EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 2084
2085/*
2086 * Allocate a skb from the socket's send buffer.
2087 */
86a76caf 2088struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 2089 gfp_t priority)
1da177e4 2090{
14afee4b 2091 if (force || refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 2092 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 2093 if (skb) {
2094 skb_set_owner_w(skb, sk);
2095 return skb;
2096 }
2097 }
2098 return NULL;
2099}
2a91525c 2100EXPORT_SYMBOL(sock_wmalloc);
1da177e4 2101
98ba0bd5
WB		 2102static void sock_ofree(struct sk_buff *skb)
2103{
2104 struct sock *sk = skb->sk;
2105
2106 atomic_sub(skb->truesize, &sk->sk_omem_alloc);
2107}
2108
2109struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size,
2110 gfp_t priority)
2111{
2112 struct sk_buff *skb;
2113
2114 /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */
2115 if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) >
2116 sysctl_optmem_max)
2117 return NULL;
2118
2119 skb = alloc_skb(size, priority);
2120 if (!skb)
2121 return NULL;
2122
2123 atomic_add(skb->truesize, &sk->sk_omem_alloc);
2124 skb->sk = sk;
2125 skb->destructor = sock_ofree;
2126 return skb;
2127}
2128
4ec93edb 2129/*
1da177e4 2130 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 2131 */
dd0fc66f 2132void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 2133{
95c96174 2134 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 2135 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
2136 void *mem;
2137 /* First do the add, to avoid the race if kmalloc
4ec93edb 2138 * might sleep.
1da177e4
LT		 2139 */
2140 atomic_add(size, &sk->sk_omem_alloc);
2141 mem = kmalloc(size, priority);
2142 if (mem)
2143 return mem;
2144 atomic_sub(size, &sk->sk_omem_alloc);
2145 }
2146 return NULL;
2147}
2a91525c 2148EXPORT_SYMBOL(sock_kmalloc);
1da177e4 2149
79e88659
DB		 2150/* Free an option memory block. Note, we actually want the inline
2151 * here as this allows gcc to detect the nullify and fold away the
2152 * condition entirely.
1da177e4 2153 */
79e88659
DB		 2154static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
2155 const bool nullify)
1da177e4 2156{
e53da5fb
DM		 2157 if (WARN_ON_ONCE(!mem))
2158 return;
79e88659
DB		 2159 if (nullify)
2160 kzfree(mem);
2161 else
2162 kfree(mem);
1da177e4
LT		 2163 atomic_sub(size, &sk->sk_omem_alloc);
2164}
79e88659
DB		 2165
2166void sock_kfree_s(struct sock *sk, void *mem, int size)
2167{
2168 __sock_kfree_s(sk, mem, size, false);
2169}
2a91525c 2170EXPORT_SYMBOL(sock_kfree_s);
1da177e4 2171
79e88659
DB		 2172void sock_kzfree_s(struct sock *sk, void *mem, int size)
2173{
2174 __sock_kfree_s(sk, mem, size, true);
2175}
2176EXPORT_SYMBOL(sock_kzfree_s);
2177
1da177e4
LT		 2178/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
2179 I think, these locks should be removed for datagram sockets.
2180 */
2a91525c 2181static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 2182{
2183 DEFINE_WAIT(wait);
2184
9cd3e072 2185 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1da177e4
LT		 2186 for (;;) {
2187 if (!timeo)
2188 break;
2189 if (signal_pending(current))
2190 break;
2191 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 2192 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
14afee4b 2193 if (refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1da177e4
LT		 2194 break;
2195 if (sk->sk_shutdown & SEND_SHUTDOWN)
2196 break;
2197 if (sk->sk_err)
2198 break;
2199 timeo = schedule_timeout(timeo);
2200 }
aa395145 2201 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 2202 return timeo;
2203}
2204
2205
2206/*
2207 * Generic send/receive buffer handlers
2208 */
2209
4cc7f68d
HX		 2210struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
2211 unsigned long data_len, int noblock,
28d64271 2212 int *errcode, int max_page_order)
1da177e4 2213{
2e4e4410 2214 struct sk_buff *skb;
1da177e4
LT		 2215 long timeo;
2216 int err;
2217
1da177e4 2218 timeo = sock_sndtimeo(sk, noblock);
2e4e4410 2219 for (;;) {
1da177e4
LT		 2220 err = sock_error(sk);
2221 if (err != 0)
2222 goto failure;
2223
2224 err = -EPIPE;
2225 if (sk->sk_shutdown & SEND_SHUTDOWN)
2226 goto failure;
2227
2e4e4410
ED		 2228 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
2229 break;
28d64271 2230
9cd3e072 2231 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2e4e4410
ED		 2232 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2233 err = -EAGAIN;
2234 if (!timeo)
1da177e4 2235 goto failure;
2e4e4410
ED		 2236 if (signal_pending(current))
2237 goto interrupted;
2238 timeo = sock_wait_for_wmem(sk, timeo);
1da177e4 2239 }
2e4e4410
ED		 2240 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
2241 errcode, sk->sk_allocation);
2242 if (skb)
2243 skb_set_owner_w(skb, sk);
1da177e4
LT		 2244 return skb;
2245
2246interrupted:
2247 err = sock_intr_errno(timeo);
2248failure:
2249 *errcode = err;
2250 return NULL;
2251}
4cc7f68d 2252EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 2253
4ec93edb 2254struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 2255 int noblock, int *errcode)
2256{
28d64271 2257 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 2258}
2a91525c 2259EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 2260
39771b12
WB		 2261int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
2262 struct sockcm_cookie *sockc)
2263{
3dd17e63
SHY		 2264 u32 tsflags;
2265
39771b12
WB		 2266 switch (cmsg->cmsg_type) {
2267 case SO_MARK:
2268 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2269 return -EPERM;
2270 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2271 return -EINVAL;
2272 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
2273 break;
7f1bc6e9 2274 case SO_TIMESTAMPING_OLD:
3dd17e63
SHY		 2275 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2276 return -EINVAL;
2277
2278 tsflags = *(u32 *)CMSG_DATA(cmsg);
2279 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
2280 return -EINVAL;
2281
2282 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
2283 sockc->tsflags |= tsflags;
2284 break;
80b14dee
RC		 2285 case SCM_TXTIME:
2286 if (!sock_flag(sk, SOCK_TXTIME))
2287 return -EINVAL;
2288 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u64)))
2289 return -EINVAL;
2290 sockc->transmit_time = get_unaligned((u64 *)CMSG_DATA(cmsg));
2291 break;
779f1ede
SHY		 2292 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
2293 case SCM_RIGHTS:
2294 case SCM_CREDENTIALS:
2295 break;
39771b12
WB		 2296 default:
2297 return -EINVAL;
2298 }
2299 return 0;
2300}
2301EXPORT_SYMBOL(__sock_cmsg_send);
2302
f28ea365
EJ		 2303int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
2304 struct sockcm_cookie *sockc)
2305{
2306 struct cmsghdr *cmsg;
39771b12 2307 int ret;
f28ea365
EJ		 2308
2309 for_each_cmsghdr(cmsg, msg) {
2310 if (!CMSG_OK(msg, cmsg))
2311 return -EINVAL;
2312 if (cmsg->cmsg_level != SOL_SOCKET)
2313 continue;
39771b12
WB		 2314 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
2315 if (ret)
2316 return ret;
f28ea365
EJ		 2317 }
2318 return 0;
2319}
2320EXPORT_SYMBOL(sock_cmsg_send);
2321
06044751
ED		 2322static void sk_enter_memory_pressure(struct sock *sk)
2323{
2324 if (!sk->sk_prot->enter_memory_pressure)
2325 return;
2326
2327 sk->sk_prot->enter_memory_pressure(sk);
2328}
2329
2330static void sk_leave_memory_pressure(struct sock *sk)
2331{
2332 if (sk->sk_prot->leave_memory_pressure) {
2333 sk->sk_prot->leave_memory_pressure(sk);
2334 } else {
2335 unsigned long *memory_pressure = sk->sk_prot->memory_pressure;
2336
503978ac
ED		 2337 if (memory_pressure && READ_ONCE(*memory_pressure))
2338 WRITE_ONCE(*memory_pressure, 0);
06044751
ED		 2339 }
2340}
2341
5640f768
ED		 2342/* On 32bit arches, an skb frag is limited to 2^15 */
2343#define SKB_FRAG_PAGE_ORDER get_order(32768)
ce27ec60 2344DEFINE_STATIC_KEY_FALSE(net_high_order_alloc_disable_key);
5640f768 2345
400dfd3a
ED		 2346/**
2347 * skb_page_frag_refill - check that a page_frag contains enough room
2348 * @sz: minimum size of the fragment we want to get
2349 * @pfrag: pointer to page_frag
82d5e2b8 2350 * @gfp: priority for memory allocation
400dfd3a
ED		 2351 *
2352 * Note: While this allocator tries to use high order pages, there is
2353 * no guarantee that allocations succeed. Therefore, @sz MUST be
2354 * less or equal than PAGE_SIZE.
2355 */
d9b2938a 2356bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 2357{
5640f768 2358 if (pfrag->page) {
fe896d18 2359 if (page_ref_count(pfrag->page) == 1) {
5640f768
ED		 2360 pfrag->offset = 0;
2361 return true;
2362 }
400dfd3a 2363 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 2364 return true;
2365 put_page(pfrag->page);
2366 }
2367
d9b2938a 2368 pfrag->offset = 0;
ce27ec60
ED		 2369 if (SKB_FRAG_PAGE_ORDER &&
2370 !static_branch_unlikely(&net_high_order_alloc_disable_key)) {
d0164adc
MG		 2371 /* Avoid direct reclaim but allow kswapd to wake */
2372 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
2373 __GFP_COMP | __GFP_NOWARN |
2374 __GFP_NORETRY,
d9b2938a 2375 SKB_FRAG_PAGE_ORDER);
5640f768 2376 if (likely(pfrag->page)) {
d9b2938a 2377 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 2378 return true;
2379 }
d9b2938a
ED		 2380 }
2381 pfrag->page = alloc_page(gfp);
2382 if (likely(pfrag->page)) {
2383 pfrag->size = PAGE_SIZE;
2384 return true;
2385 }
400dfd3a
ED		 2386 return false;
2387}
2388EXPORT_SYMBOL(skb_page_frag_refill);
2389
2390bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2391{
2392 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2393 return true;
2394
5640f768
ED		 2395 sk_enter_memory_pressure(sk);
2396 sk_stream_moderate_sndbuf(sk);
2397 return false;
2398}
2399EXPORT_SYMBOL(sk_page_frag_refill);
2400
1da177e4 2401static void __lock_sock(struct sock *sk)
f39234d6
NK		 2402 __releases(&sk->sk_lock.slock)
2403 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 2404{
2405 DEFINE_WAIT(wait);
2406
e71a4783 2407 for (;;) {
1da177e4
LT		 2408 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2409 TASK_UNINTERRUPTIBLE);
2410 spin_unlock_bh(&sk->sk_lock.slock);
2411 schedule();
2412 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 2413 if (!sock_owned_by_user(sk))
1da177e4
LT		 2414 break;
2415 }
2416 finish_wait(&sk->sk_lock.wq, &wait);
2417}
2418
8873c064 2419void __release_sock(struct sock *sk)
f39234d6
NK		 2420 __releases(&sk->sk_lock.slock)
2421 __acquires(&sk->sk_lock.slock)
1da177e4 2422{
5413d1ba 2423 struct sk_buff *skb, *next;
1da177e4 2424
5413d1ba 2425 while ((skb = sk->sk_backlog.head) != NULL) {
1da177e4 2426 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1da177e4 2427
5413d1ba 2428 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4 2429
5413d1ba
ED		 2430 do {
2431 next = skb->next;
e4cbb02a 2432 prefetch(next);
7fee226a 2433 WARN_ON_ONCE(skb_dst_is_noref(skb));
a8305bff 2434 skb_mark_not_on_list(skb);
c57943a1 2435 sk_backlog_rcv(sk, skb);
1da177e4 2436
5413d1ba 2437 cond_resched();
1da177e4
LT		 2438
2439 skb = next;
2440 } while (skb != NULL);
2441
5413d1ba
ED		 2442 spin_lock_bh(&sk->sk_lock.slock);
2443 }
8eae939f
ZY		 2444
2445 /*
2446 * Doing the zeroing here guarantee we can not loop forever
2447 * while a wild producer attempts to flood us.
2448 */
2449 sk->sk_backlog.len = 0;
1da177e4
LT		 2450}
2451
d41a69f1
ED		 2452void __sk_flush_backlog(struct sock *sk)
2453{
2454 spin_lock_bh(&sk->sk_lock.slock);
2455 __release_sock(sk);
2456 spin_unlock_bh(&sk->sk_lock.slock);
2457}
2458
1da177e4
LT		 2459/**
2460 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 2461 * @sk: sock to wait on
2462 * @timeo: for how long
dfbafc99 2463 * @skb: last skb seen on sk_receive_queue
1da177e4
LT		 2464 *
2465 * Now socket state including sk->sk_err is changed only under lock,
2466 * hence we may omit checks after joining wait queue.
2467 * We check receive queue before schedule() only as optimization;
2468 * it is very likely that release_sock() added new data.
2469 */
dfbafc99 2470int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
1da177e4 2471{
d9dc8b0f 2472 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1da177e4 2473 int rc;
1da177e4 2474
d9dc8b0f 2475 add_wait_queue(sk_sleep(sk), &wait);
9cd3e072 2476 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
d9dc8b0f 2477 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
9cd3e072 2478 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
d9dc8b0f 2479 remove_wait_queue(sk_sleep(sk), &wait);
1da177e4
LT		 2480 return rc;
2481}
1da177e4
LT		 2482EXPORT_SYMBOL(sk_wait_data);
2483
3ab224be 2484/**
f8c3bf00 2485 * __sk_mem_raise_allocated - increase memory_allocated
3ab224be
HA		 2486 * @sk: socket
2487 * @size: memory size to allocate
f8c3bf00 2488 * @amt: pages to allocate
3ab224be
HA		 2489 * @kind: allocation type
2490 *
f8c3bf00 2491 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc
3ab224be 2492 */
f8c3bf00 2493int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
3ab224be
HA		 2494{
2495 struct proto *prot = sk->sk_prot;
f8c3bf00 2496 long allocated = sk_memory_allocated_add(sk, amt);
d6f19938 2497 bool charged = true;
e805605c 2498
baac50bb 2499 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
d6f19938 2500 !(charged = mem_cgroup_charge_skmem(sk->sk_memcg, amt)))
e805605c 2501 goto suppress_allocation;
3ab224be
HA		 2502
2503 /* Under limit. */
e805605c 2504 if (allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2505 sk_leave_memory_pressure(sk);
3ab224be
HA		 2506 return 1;
2507 }
2508
e805605c
JW		 2509 /* Under pressure. */
2510 if (allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2511 sk_enter_memory_pressure(sk);
3ab224be 2512
e805605c
JW		 2513 /* Over hard limit. */
2514 if (allocated > sk_prot_mem_limits(sk, 2))
3ab224be
HA		 2515 goto suppress_allocation;
2516
2517 /* guarantee minimum buffer size under pressure */
2518 if (kind == SK_MEM_RECV) {
a3dcaf17 2519 if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot))
3ab224be 2520 return 1;
180d8cd9 2521
3ab224be 2522 } else { /* SK_MEM_SEND */
a3dcaf17
ED		 2523 int wmem0 = sk_get_wmem0(sk, prot);
2524
3ab224be 2525 if (sk->sk_type == SOCK_STREAM) {
a3dcaf17 2526 if (sk->sk_wmem_queued < wmem0)
3ab224be 2527 return 1;
a3dcaf17 2528 } else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) {
3ab224be 2529 return 1;
a3dcaf17 2530 }
3ab224be
HA		 2531 }
2532
180d8cd9 2533 if (sk_has_memory_pressure(sk)) {
5bf325a5 2534 u64 alloc;
1748376b 2535
180d8cd9 2536 if (!sk_under_memory_pressure(sk))
1748376b 2537 return 1;
180d8cd9
GC		 2538 alloc = sk_sockets_allocated_read_positive(sk);
2539 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2540 sk_mem_pages(sk->sk_wmem_queued +
2541 atomic_read(&sk->sk_rmem_alloc) +
2542 sk->sk_forward_alloc))
2543 return 1;
2544 }
2545
2546suppress_allocation:
2547
2548 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2549 sk_stream_moderate_sndbuf(sk);
2550
2551 /* Fail only if socket is _under_ its sndbuf.
2552 * In this case we cannot block, so that we have to fail.
2553 */
2554 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2555 return 1;
2556 }
2557
d6f19938
YS		 2558 if (kind == SK_MEM_SEND || (kind == SK_MEM_RECV && charged))
2559 trace_sock_exceed_buf_limit(sk, prot, allocated, kind);
3847ce32 2560
0e90b31f 2561 sk_memory_allocated_sub(sk, amt);
180d8cd9 2562
baac50bb
JW		 2563 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2564 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
e805605c 2565
3ab224be
HA		 2566 return 0;
2567}
f8c3bf00
PA		 2568EXPORT_SYMBOL(__sk_mem_raise_allocated);
2569
2570/**
2571 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2572 * @sk: socket
2573 * @size: memory size to allocate
2574 * @kind: allocation type
2575 *
2576 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2577 * rmem allocation. This function assumes that protocols which have
2578 * memory_pressure use sk_wmem_queued as write buffer accounting.
2579 */
2580int __sk_mem_schedule(struct sock *sk, int size, int kind)
2581{
2582 int ret, amt = sk_mem_pages(size);
2583
2584 sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT;
2585 ret = __sk_mem_raise_allocated(sk, size, amt, kind);
2586 if (!ret)
2587 sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT;
2588 return ret;
2589}
3ab224be
HA		 2590EXPORT_SYMBOL(__sk_mem_schedule);
2591
2592/**
f8c3bf00 2593 * __sk_mem_reduce_allocated - reclaim memory_allocated
3ab224be 2594 * @sk: socket
f8c3bf00
PA		 2595 * @amount: number of quanta
2596 *
2597 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
3ab224be 2598 */
f8c3bf00 2599void __sk_mem_reduce_allocated(struct sock *sk, int amount)
3ab224be 2600{
1a24e04e 2601 sk_memory_allocated_sub(sk, amount);
3ab224be 2602
baac50bb
JW		 2603 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2604 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
e805605c 2605
180d8cd9
GC		 2606 if (sk_under_memory_pressure(sk) &&
2607 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2608 sk_leave_memory_pressure(sk);
3ab224be 2609}
f8c3bf00
PA		 2610EXPORT_SYMBOL(__sk_mem_reduce_allocated);
2611
2612/**
2613 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
2614 * @sk: socket
2615 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
2616 */
2617void __sk_mem_reclaim(struct sock *sk, int amount)
2618{
2619 amount >>= SK_MEM_QUANTUM_SHIFT;
2620 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
2621 __sk_mem_reduce_allocated(sk, amount);
2622}
3ab224be
HA		 2623EXPORT_SYMBOL(__sk_mem_reclaim);
2624
627d2d6b 2625int sk_set_peek_off(struct sock *sk, int val)
2626{
627d2d6b 2627 sk->sk_peek_off = val;
2628 return 0;
2629}
2630EXPORT_SYMBOL_GPL(sk_set_peek_off);
3ab224be 2631
1da177e4
LT		 2632/*
2633 * Set of default routines for initialising struct proto_ops when
2634 * the protocol does not support a particular function. In certain
2635 * cases where it makes no sense for a protocol to have a "do nothing"
2636 * function, some default processing is provided.
2637 */
2638
2639int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2640{
2641 return -EOPNOTSUPP;
2642}
2a91525c 2643EXPORT_SYMBOL(sock_no_bind);
1da177e4 2644
4ec93edb 2645int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2646 int len, int flags)
2647{
2648 return -EOPNOTSUPP;
2649}
2a91525c 2650EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2651
2652int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2653{
2654 return -EOPNOTSUPP;
2655}
2a91525c 2656EXPORT_SYMBOL(sock_no_socketpair);
1da177e4 2657
cdfbabfb
DH		 2658int sock_no_accept(struct socket *sock, struct socket *newsock, int flags,
2659 bool kern)
1da177e4
LT		 2660{
2661 return -EOPNOTSUPP;
2662}
2a91525c 2663EXPORT_SYMBOL(sock_no_accept);
1da177e4 2664
4ec93edb 2665int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
9b2c45d4 2666 int peer)
1da177e4
LT		 2667{
2668 return -EOPNOTSUPP;
2669}
2a91525c 2670EXPORT_SYMBOL(sock_no_getname);
1da177e4 2671
1da177e4
LT		 2672int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2673{
2674 return -EOPNOTSUPP;
2675}
2a91525c 2676EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2677
2678int sock_no_listen(struct socket *sock, int backlog)
2679{
2680 return -EOPNOTSUPP;
2681}
2a91525c 2682EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2683
2684int sock_no_shutdown(struct socket *sock, int how)
2685{
2686 return -EOPNOTSUPP;
2687}
2a91525c 2688EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2689
2690int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2691 char __user *optval, unsigned int optlen)
1da177e4
LT		 2692{
2693 return -EOPNOTSUPP;
2694}
2a91525c 2695EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2696
2697int sock_no_getsockopt(struct socket *sock, int level, int optname,
2698 char __user *optval, int __user *optlen)
2699{
2700 return -EOPNOTSUPP;
2701}
2a91525c 2702EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4 2703
1b784140 2704int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
1da177e4
LT		 2705{
2706 return -EOPNOTSUPP;
2707}
2a91525c 2708EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4 2709
306b13eb
TH		 2710int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len)
2711{
2712 return -EOPNOTSUPP;
2713}
2714EXPORT_SYMBOL(sock_no_sendmsg_locked);
2715
1b784140
YX		 2716int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2717 int flags)
1da177e4
LT		 2718{
2719 return -EOPNOTSUPP;
2720}
2a91525c 2721EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2722
2723int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2724{
2725 /* Mirror missing mmap method error code */
2726 return -ENODEV;
2727}
2a91525c 2728EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2729
2730ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2731{
2732 ssize_t res;
2733 struct msghdr msg = {.msg_flags = flags};
2734 struct kvec iov;
2735 char *kaddr = kmap(page);
2736 iov.iov_base = kaddr + offset;
2737 iov.iov_len = size;
2738 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2739 kunmap(page);
2740 return res;
2741}
2a91525c 2742EXPORT_SYMBOL(sock_no_sendpage);
1da177e4 2743
306b13eb
TH		 2744ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page,
2745 int offset, size_t size, int flags)
2746{
2747 ssize_t res;
2748 struct msghdr msg = {.msg_flags = flags};
2749 struct kvec iov;
2750 char *kaddr = kmap(page);
2751
2752 iov.iov_base = kaddr + offset;
2753 iov.iov_len = size;
2754 res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size);
2755 kunmap(page);
2756 return res;
2757}
2758EXPORT_SYMBOL(sock_no_sendpage_locked);
2759
1da177e4
LT		 2760/*
2761 * Default Socket Callbacks
2762 */
2763
2764static void sock_def_wakeup(struct sock *sk)
2765{
43815482
ED		 2766 struct socket_wq *wq;
2767
2768 rcu_read_lock();
2769 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2770 if (skwq_has_sleeper(wq))
43815482
ED		 2771 wake_up_interruptible_all(&wq->wait);
2772 rcu_read_unlock();
1da177e4
LT		 2773}
2774
2775static void sock_def_error_report(struct sock *sk)
2776{
43815482
ED		 2777 struct socket_wq *wq;
2778
2779 rcu_read_lock();
2780 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2781 if (skwq_has_sleeper(wq))
a9a08845 2782 wake_up_interruptible_poll(&wq->wait, EPOLLERR);
8d8ad9d7 2783 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2784 rcu_read_unlock();
1da177e4
LT		 2785}
2786
676d2369 2787static void sock_def_readable(struct sock *sk)
1da177e4 2788{
43815482
ED		 2789 struct socket_wq *wq;
2790
2791 rcu_read_lock();
2792 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2793 if (skwq_has_sleeper(wq))
a9a08845
LT		 2794 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
2795 EPOLLRDNORM | EPOLLRDBAND);
8d8ad9d7 2796 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2797 rcu_read_unlock();
1da177e4
LT		 2798}
2799
2800static void sock_def_write_space(struct sock *sk)
2801{
43815482
ED		 2802 struct socket_wq *wq;
2803
2804 rcu_read_lock();
1da177e4
LT		 2805
2806 /* Do not wake up a writer until he can make "significant"
2807 * progress. --DaveM
2808 */
14afee4b 2809 if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482 2810 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2811 if (skwq_has_sleeper(wq))
a9a08845
LT		 2812 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2813 EPOLLWRNORM | EPOLLWRBAND);
1da177e4
LT		 2814
2815 /* Should agree with poll, otherwise some programs break */
2816 if (sock_writeable(sk))
8d8ad9d7 2817 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2818 }
2819
43815482 2820 rcu_read_unlock();
1da177e4
LT		 2821}
2822
2823static void sock_def_destruct(struct sock *sk)
2824{
1da177e4
LT		 2825}
2826
2827void sk_send_sigurg(struct sock *sk)
2828{
2829 if (sk->sk_socket && sk->sk_socket->file)
2830 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2831 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2832}
2a91525c 2833EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2834
2835void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2836 unsigned long expires)
2837{
2838 if (!mod_timer(timer, expires))
2839 sock_hold(sk);
2840}
1da177e4
LT		 2841EXPORT_SYMBOL(sk_reset_timer);
2842
2843void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2844{
25cc4ae9 2845 if (del_timer(timer))
1da177e4
LT		 2846 __sock_put(sk);
2847}
1da177e4
LT		 2848EXPORT_SYMBOL(sk_stop_timer);
2849
2850void sock_init_data(struct socket *sock, struct sock *sk)
2851{
581319c5 2852 sk_init_common(sk);
1da177e4
LT		 2853 sk->sk_send_head = NULL;
2854
99767f27 2855 timer_setup(&sk->sk_timer, NULL, 0);
4ec93edb 2856
1da177e4
LT		 2857 sk->sk_allocation = GFP_KERNEL;
2858 sk->sk_rcvbuf = sysctl_rmem_default;
2859 sk->sk_sndbuf = sysctl_wmem_default;
2860 sk->sk_state = TCP_CLOSE;
972692e0 2861 sk_set_socket(sk, sock);
1da177e4
LT		 2862
2863 sock_set_flag(sk, SOCK_ZAPPED);
2864
e71a4783 2865 if (sock) {
1da177e4 2866 sk->sk_type = sock->type;
333f7909 2867 RCU_INIT_POINTER(sk->sk_wq, &sock->wq);
1da177e4 2868 sock->sk = sk;
86741ec2
LC		 2869 sk->sk_uid = SOCK_INODE(sock)->i_uid;
2870 } else {
c2f26e8f 2871 RCU_INIT_POINTER(sk->sk_wq, NULL);
86741ec2
LC		 2872 sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0);
2873 }
1da177e4 2874
1da177e4 2875 rwlock_init(&sk->sk_callback_lock);
cdfbabfb
DH		 2876 if (sk->sk_kern_sock)
2877 lockdep_set_class_and_name(
2878 &sk->sk_callback_lock,
2879 af_kern_callback_keys + sk->sk_family,
2880 af_family_kern_clock_key_strings[sk->sk_family]);
2881 else
2882 lockdep_set_class_and_name(
2883 &sk->sk_callback_lock,
443aef0e
PZ		 2884 af_callback_keys + sk->sk_family,
2885 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2886
2887 sk->sk_state_change = sock_def_wakeup;
2888 sk->sk_data_ready = sock_def_readable;
2889 sk->sk_write_space = sock_def_write_space;
2890 sk->sk_error_report = sock_def_error_report;
2891 sk->sk_destruct = sock_def_destruct;
2892
5640f768
ED		 2893 sk->sk_frag.page = NULL;
2894 sk->sk_frag.offset = 0;
ef64a54f 2895 sk->sk_peek_off = -1;
1da177e4 2896
109f6e39
EB		 2897 sk->sk_peer_pid = NULL;
2898 sk->sk_peer_cred = NULL;
1da177e4
LT		 2899 sk->sk_write_pending = 0;
2900 sk->sk_rcvlowat = 1;
2901 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2902 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2903
6c7c98ba 2904 sk->sk_stamp = SK_DEFAULT_STAMP;
3a0ed3e9
DD		 2905#if BITS_PER_LONG==32
2906 seqlock_init(&sk->sk_stamp_seq);
2907#endif
52267790 2908 atomic_set(&sk->sk_zckey, 0);
1da177e4 2909
e0d1095a 2910#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2911 sk->sk_napi_id = 0;
64b0dc51 2912 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2913#endif
2914
76a9ebe8
ED		 2915 sk->sk_max_pacing_rate = ~0UL;
2916 sk->sk_pacing_rate = ~0UL;
3a9b76fd 2917 sk->sk_pacing_shift = 10;
70da268b 2918 sk->sk_incoming_cpu = -1;
c6345ce7
AN		 2919
2920 sk_rx_queue_clear(sk);
4dc6dc71
ED		 2921 /*
2922 * Before updating sk_refcnt, we must commit prior changes to memory
2923 * (Documentation/RCU/rculist_nulls.txt for details)
2924 */
2925 smp_wmb();
41c6d650 2926 refcount_set(&sk->sk_refcnt, 1);
33c732c3 2927 atomic_set(&sk->sk_drops, 0);
1da177e4 2928}
2a91525c 2929EXPORT_SYMBOL(sock_init_data);
1da177e4 2930
b5606c2d 2931void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2932{
2933 might_sleep();
a5b5bb9a 2934 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2935 if (sk->sk_lock.owned)
1da177e4 2936 __lock_sock(sk);
d2e9117c 2937 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2938 spin_unlock(&sk->sk_lock.slock);
2939 /*
2940 * The sk_lock has mutex_lock() semantics here:
2941 */
fcc70d5f 2942 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2943 local_bh_enable();
1da177e4 2944}
fcc70d5f 2945EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2946
b5606c2d 2947void release_sock(struct sock *sk)
1da177e4 2948{
a5b5bb9a 2949 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2950 if (sk->sk_backlog.tail)
2951 __release_sock(sk);
46d3ceab 2952
c3f9b018
ED		 2953 /* Warning : release_cb() might need to release sk ownership,
2954 * ie call sock_release_ownership(sk) before us.
2955 */
46d3ceab
ED		 2956 if (sk->sk_prot->release_cb)
2957 sk->sk_prot->release_cb(sk);
2958
c3f9b018 2959 sock_release_ownership(sk);
a5b5bb9a
IM		 2960 if (waitqueue_active(&sk->sk_lock.wq))
2961 wake_up(&sk->sk_lock.wq);
2962 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2963}
2964EXPORT_SYMBOL(release_sock);
2965
8a74ad60
ED		 2966/**
2967 * lock_sock_fast - fast version of lock_sock
2968 * @sk: socket
2969 *
2970 * This version should be used for very small section, where process wont block
d651983d
MCC		 2971 * return false if fast path is taken:
2972 *
8a74ad60 2973 * sk_lock.slock locked, owned = 0, BH disabled
d651983d
MCC		 2974 *
2975 * return true if slow path is taken:
2976 *
8a74ad60
ED		 2977 * sk_lock.slock unlocked, owned = 1, BH enabled
2978 */
2979bool lock_sock_fast(struct sock *sk)
2980{
2981 might_sleep();
2982 spin_lock_bh(&sk->sk_lock.slock);
2983
2984 if (!sk->sk_lock.owned)
2985 /*
2986 * Note : We must disable BH
2987 */
2988 return false;
2989
2990 __lock_sock(sk);
2991 sk->sk_lock.owned = 1;
2992 spin_unlock(&sk->sk_lock.slock);
2993 /*
2994 * The sk_lock has mutex_lock() semantics here:
2995 */
2996 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2997 local_bh_enable();
2998 return true;
2999}
3000EXPORT_SYMBOL(lock_sock_fast);
3001
c7cbdbf2
AB		 3002int sock_gettstamp(struct socket *sock, void __user *userstamp,
3003 bool timeval, bool time32)
4ec93edb 3004{
c7cbdbf2
AB		 3005 struct sock *sk = sock->sk;
3006 struct timespec64 ts;
9dae3497
YS		 3007
3008 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
c7cbdbf2
AB		 3009 ts = ktime_to_timespec64(sock_read_timestamp(sk));
3010 if (ts.tv_sec == -1)
1da177e4 3011 return -ENOENT;
c7cbdbf2 3012 if (ts.tv_sec == 0) {
3a0ed3e9 3013 ktime_t kt = ktime_get_real();
c7cbdbf2
AB		 3014 sock_write_timestamp(sk, kt);;
3015 ts = ktime_to_timespec64(kt);
b7aa0bf7 3016 }
1da177e4 3017
c7cbdbf2
AB		 3018 if (timeval)
3019 ts.tv_nsec /= 1000;
9dae3497 3020
c7cbdbf2
AB		 3021#ifdef CONFIG_COMPAT_32BIT_TIME
3022 if (time32)
3023 return put_old_timespec32(&ts, userstamp);
3024#endif
3025#ifdef CONFIG_SPARC64
3026 /* beware of padding in sparc64 timeval */
3027 if (timeval && !in_compat_syscall()) {
3028 struct __kernel_old_timeval __user tv = {
c98f4822
SR		 3029 .tv_sec = ts.tv_sec,
3030 .tv_usec = ts.tv_nsec,
c7cbdbf2 3031 };
c98f4822 3032 if (copy_to_user(userstamp, &tv, sizeof(tv)))
c7cbdbf2
AB		 3033 return -EFAULT;
3034 return 0;
ae40eb1e 3035 }
c7cbdbf2
AB		 3036#endif
3037 return put_timespec64(&ts, userstamp);
ae40eb1e 3038}
c7cbdbf2 3039EXPORT_SYMBOL(sock_gettstamp);
ae40eb1e 3040
20d49473 3041void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 3042{
20d49473 3043 if (!sock_flag(sk, flag)) {
08e29af3
ED		 3044 unsigned long previous_flags = sk->sk_flags;
3045
20d49473
PO		 3046 sock_set_flag(sk, flag);
3047 /*
3048 * we just set one of the two flags which require net
3049 * time stamping, but time stamping might have been on
3050 * already because of the other one
3051 */
080a270f
HFS		 3052 if (sock_needs_netstamp(sk) &&
3053 !(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 3054 net_enable_timestamp();
1da177e4
LT		 3055 }
3056}
1da177e4 3057
cb820f8e
RC		 3058int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
3059 int level, int type)
3060{
3061 struct sock_exterr_skb *serr;
364a9e93 3062 struct sk_buff *skb;
cb820f8e
RC		 3063 int copied, err;
3064
3065 err = -EAGAIN;
364a9e93 3066 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 3067 if (skb == NULL)
3068 goto out;
3069
3070 copied = skb->len;
3071 if (copied > len) {
3072 msg->msg_flags |= MSG_TRUNC;
3073 copied = len;
3074 }
51f3d02b 3075 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 3076 if (err)
3077 goto out_free_skb;
3078
3079 sock_recv_timestamp(msg, sk, skb);
3080
3081 serr = SKB_EXT_ERR(skb);
3082 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
3083
3084 msg->msg_flags |= MSG_ERRQUEUE;
3085 err = copied;
3086
cb820f8e
RC		 3087out_free_skb:
3088 kfree_skb(skb);
3089out:
3090 return err;
3091}
3092EXPORT_SYMBOL(sock_recv_errqueue);
3093
1da177e4
LT		 3094/*
3095 * Get a socket option on an socket.
3096 *
3097 * FIX: POSIX 1003.1g is very ambiguous here. It states that
3098 * asynchronous errors should be reported by getsockopt. We assume
3099 * this means if you specify SO_ERROR (otherwise whats the point of it).
3100 */
3101int sock_common_getsockopt(struct socket *sock, int level, int optname,
3102 char __user *optval, int __user *optlen)
3103{
3104 struct sock *sk = sock->sk;
3105
3106 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
3107}
1da177e4
LT		 3108EXPORT_SYMBOL(sock_common_getsockopt);
3109
3fdadf7d 3110#ifdef CONFIG_COMPAT
543d9cfe
ACM		 3111int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
3112 char __user *optval, int __user *optlen)
3fdadf7d
DM		 3113{
3114 struct sock *sk = sock->sk;
3115
1e51f951 3116 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 3117 return sk->sk_prot->compat_getsockopt(sk, level, optname,
3118 optval, optlen);
3fdadf7d
DM		 3119 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
3120}
3121EXPORT_SYMBOL(compat_sock_common_getsockopt);
3122#endif
3123
1b784140
YX		 3124int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
3125 int flags)
1da177e4
LT		 3126{
3127 struct sock *sk = sock->sk;
3128 int addr_len = 0;
3129 int err;
3130
1b784140 3131 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
1da177e4
LT		 3132 flags & ~MSG_DONTWAIT, &addr_len);
3133 if (err >= 0)
3134 msg->msg_namelen = addr_len;
3135 return err;
3136}
1da177e4
LT		 3137EXPORT_SYMBOL(sock_common_recvmsg);
3138
3139/*
3140 * Set socket options on an inet socket.
3141 */
3142int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 3143 char __user *optval, unsigned int optlen)
1da177e4
LT		 3144{
3145 struct sock *sk = sock->sk;
3146
3147 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
3148}
1da177e4
LT		 3149EXPORT_SYMBOL(sock_common_setsockopt);
3150
3fdadf7d 3151#ifdef CONFIG_COMPAT
543d9cfe 3152int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 3153 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 3154{
3155 struct sock *sk = sock->sk;
3156
543d9cfe
ACM		 3157 if (sk->sk_prot->compat_setsockopt != NULL)
3158 return sk->sk_prot->compat_setsockopt(sk, level, optname,
3159 optval, optlen);
3fdadf7d
DM		 3160 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
3161}
3162EXPORT_SYMBOL(compat_sock_common_setsockopt);
3163#endif
3164
1da177e4
LT		 3165void sk_common_release(struct sock *sk)
3166{
3167 if (sk->sk_prot->destroy)
3168 sk->sk_prot->destroy(sk);
3169
3170 /*
3171 * Observation: when sock_common_release is called, processes have
3172 * no access to socket. But net still has.
3173 * Step one, detach it from networking:
3174 *
3175 * A. Remove from hash tables.
3176 */
3177
3178 sk->sk_prot->unhash(sk);
3179
3180 /*
3181 * In this point socket cannot receive new packets, but it is possible
3182 * that some packets are in flight because some CPU runs receiver and
3183 * did hash table lookup before we unhashed socket. They will achieve
3184 * receive queue and will be purged by socket destructor.
3185 *
3186 * Also we still have packets pending on receive queue and probably,
3187 * our own packets waiting in device queues. sock_destroy will drain
3188 * receive queue, but transmitted packets will delay socket destruction
3189 * until the last reference will be released.
3190 */
3191
3192 sock_orphan(sk);
3193
3194 xfrm_sk_free_policy(sk);
3195
e6848976 3196 sk_refcnt_debug_release(sk);
5640f768 3197
1da177e4
LT		 3198 sock_put(sk);
3199}
1da177e4
LT		 3200EXPORT_SYMBOL(sk_common_release);
3201
a2d133b1
JH		 3202void sk_get_meminfo(const struct sock *sk, u32 *mem)
3203{
3204 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
3205
3206 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
3207 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
3208 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
3209 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
3210 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
3211 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
3212 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
70c26558 3213 mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len);
a2d133b1
JH		 3214 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
3215}
3216
13ff3d6f
PE		 3217#ifdef CONFIG_PROC_FS
3218#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 3219struct prot_inuse {
3220 int val[PROTO_INUSE_NR];
3221};
13ff3d6f
PE		 3222
3223static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159 3224
70ee1159
PE		 3225void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
3226{
08fc7f81 3227 __this_cpu_add(net->core.prot_inuse->val[prot->inuse_idx], val);
70ee1159
PE		 3228}
3229EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
3230
3231int sock_prot_inuse_get(struct net *net, struct proto *prot)
3232{
3233 int cpu, idx = prot->inuse_idx;
3234 int res = 0;
3235
3236 for_each_possible_cpu(cpu)
08fc7f81 3237 res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx];
70ee1159
PE		 3238
3239 return res >= 0 ? res : 0;
3240}
3241EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
3242
648845ab
TZ		 3243static void sock_inuse_add(struct net *net, int val)
3244{
3245 this_cpu_add(*net->core.sock_inuse, val);
3246}
3247
3248int sock_inuse_get(struct net *net)
3249{
3250 int cpu, res = 0;
3251
3252 for_each_possible_cpu(cpu)
3253 res += *per_cpu_ptr(net->core.sock_inuse, cpu);
3254
3255 return res;
3256}
3257
3258EXPORT_SYMBOL_GPL(sock_inuse_get);
3259
2c8c1e72 3260static int __net_init sock_inuse_init_net(struct net *net)
70ee1159 3261{
08fc7f81 3262 net->core.prot_inuse = alloc_percpu(struct prot_inuse);
648845ab
TZ		 3263 if (net->core.prot_inuse == NULL)
3264 return -ENOMEM;
3265
3266 net->core.sock_inuse = alloc_percpu(int);
3267 if (net->core.sock_inuse == NULL)
3268 goto out;
3269
3270 return 0;
3271
3272out:
3273 free_percpu(net->core.prot_inuse);
3274 return -ENOMEM;
70ee1159
PE		 3275}
3276
2c8c1e72 3277static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159 3278{
08fc7f81 3279 free_percpu(net->core.prot_inuse);
648845ab 3280 free_percpu(net->core.sock_inuse);
70ee1159
PE		 3281}
3282
3283static struct pernet_operations net_inuse_ops = {
3284 .init = sock_inuse_init_net,
3285 .exit = sock_inuse_exit_net,
3286};
3287
3288static __init int net_inuse_init(void)
3289{
3290 if (register_pernet_subsys(&net_inuse_ops))
3291 panic("Cannot initialize net inuse counters");
3292
3293 return 0;
3294}
3295
3296core_initcall(net_inuse_init);
13ff3d6f 3297
b45ce321 3298static int assign_proto_idx(struct proto *prot)
13ff3d6f
PE		 3299{
3300 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
3301
3302 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 3303 pr_err("PROTO_INUSE_NR exhausted\n");
b45ce321 3304 return -ENOSPC;
13ff3d6f
PE		 3305 }
3306
3307 set_bit(prot->inuse_idx, proto_inuse_idx);
b45ce321 3308 return 0;
13ff3d6f
PE		 3309}
3310
3311static void release_proto_idx(struct proto *prot)
3312{
3313 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
3314 clear_bit(prot->inuse_idx, proto_inuse_idx);
3315}
3316#else
b45ce321 3317static inline int assign_proto_idx(struct proto *prot)
13ff3d6f 3318{
b45ce321 3319 return 0;
13ff3d6f
PE		 3320}
3321
3322static inline void release_proto_idx(struct proto *prot)
3323{
3324}
648845ab
TZ		 3325
3326static void sock_inuse_add(struct net *net, int val)
3327{
3328}
13ff3d6f
PE		 3329#endif
3330
0159dfd3
ED		 3331static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
3332{
3333 if (!rsk_prot)
3334 return;
3335 kfree(rsk_prot->slab_name);
3336 rsk_prot->slab_name = NULL;
adf78eda
JL		 3337 kmem_cache_destroy(rsk_prot->slab);
3338 rsk_prot->slab = NULL;
0159dfd3
ED		 3339}
3340
3341static int req_prot_init(const struct proto *prot)
3342{
3343 struct request_sock_ops *rsk_prot = prot->rsk_prot;
3344
3345 if (!rsk_prot)
3346 return 0;
3347
3348 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
3349 prot->name);
3350 if (!rsk_prot->slab_name)
3351 return -ENOMEM;
3352
3353 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
3354 rsk_prot->obj_size, 0,
e699e2c6
SB		 3355 SLAB_ACCOUNT | prot->slab_flags,
3356 NULL);
0159dfd3
ED		 3357
3358 if (!rsk_prot->slab) {
3359 pr_crit("%s: Can't create request sock SLAB cache!\n",
3360 prot->name);
3361 return -ENOMEM;
3362 }
3363 return 0;
3364}
3365
b733c007
PE		 3366int proto_register(struct proto *prot, int alloc_slab)
3367{
b45ce321 3368 int ret = -ENOBUFS;
3369
1da177e4 3370 if (alloc_slab) {
30c2c9f1
DW		 3371 prot->slab = kmem_cache_create_usercopy(prot->name,
3372 prot->obj_size, 0,
e699e2c6
SB		 3373 SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT |
3374 prot->slab_flags,
289a4860 3375 prot->useroffset, prot->usersize,
271b72c7 3376 NULL);
1da177e4
LT		 3377
3378 if (prot->slab == NULL) {
e005d193
JP		 3379 pr_crit("%s: Can't create sock SLAB cache!\n",
3380 prot->name);
60e7663d 3381 goto out;
1da177e4 3382 }
2e6599cb 3383
0159dfd3
ED		 3384 if (req_prot_init(prot))
3385 goto out_free_request_sock_slab;
8feaf0c0 3386
6d6ee43e 3387 if (prot->twsk_prot != NULL) {
faf23422 3388 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 3389
7e56b5d6 3390 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 3391 goto out_free_request_sock_slab;
3392
6d6ee43e 3393 prot->twsk_prot->twsk_slab =
7e56b5d6 3394 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 3395 prot->twsk_prot->twsk_obj_size,
3ab5aee7 3396 0,
e699e2c6 3397 SLAB_ACCOUNT |
52db70dc 3398 prot->slab_flags,
20c2df83 3399 NULL);
6d6ee43e 3400 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 3401 goto out_free_timewait_sock_slab_name;
3402 }
1da177e4
LT		 3403 }
3404
36b77a52 3405 mutex_lock(&proto_list_mutex);
b45ce321 3406 ret = assign_proto_idx(prot);
3407 if (ret) {
3408 mutex_unlock(&proto_list_mutex);
3409 goto out_free_timewait_sock_slab_name;
3410 }
1da177e4 3411 list_add(&prot->node, &proto_list);
36b77a52 3412 mutex_unlock(&proto_list_mutex);
b45ce321 3413 return ret;
b733c007 3414
8feaf0c0 3415out_free_timewait_sock_slab_name:
b45ce321 3416 if (alloc_slab && prot->twsk_prot)
3417 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0 3418out_free_request_sock_slab:
b45ce321 3419 if (alloc_slab) {
3420 req_prot_cleanup(prot->rsk_prot);
0159dfd3 3421
b45ce321 3422 kmem_cache_destroy(prot->slab);
3423 prot->slab = NULL;
3424 }
b733c007 3425out:
b45ce321 3426 return ret;
1da177e4 3427}
1da177e4
LT		 3428EXPORT_SYMBOL(proto_register);
3429
3430void proto_unregister(struct proto *prot)
3431{
36b77a52 3432 mutex_lock(&proto_list_mutex);
13ff3d6f 3433 release_proto_idx(prot);
0a3f4358 3434 list_del(&prot->node);
36b77a52 3435 mutex_unlock(&proto_list_mutex);
1da177e4 3436
adf78eda
JL		 3437 kmem_cache_destroy(prot->slab);
3438 prot->slab = NULL;
1da177e4 3439
0159dfd3 3440 req_prot_cleanup(prot->rsk_prot);
2e6599cb 3441
6d6ee43e 3442 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 3443 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 3444 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 3445 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 3446 }
1da177e4 3447}
1da177e4
LT		 3448EXPORT_SYMBOL(proto_unregister);
3449
bf2ae2e4
XL		 3450int sock_load_diag_module(int family, int protocol)
3451{
3452 if (!protocol) {
3453 if (!sock_is_registered(family))
3454 return -ENOENT;
3455
3456 return request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
3457 NETLINK_SOCK_DIAG, family);
3458 }
3459
3460#ifdef CONFIG_INET
3461 if (family == AF_INET &&
c34c1287 3462 protocol != IPPROTO_RAW &&
bf2ae2e4
XL		 3463 !rcu_access_pointer(inet_protos[protocol]))
3464 return -ENOENT;
3465#endif
3466
3467 return request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
3468 NETLINK_SOCK_DIAG, family, protocol);
3469}
3470EXPORT_SYMBOL(sock_load_diag_module);
3471
1da177e4 3472#ifdef CONFIG_PROC_FS
1da177e4 3473static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 3474 __acquires(proto_list_mutex)
1da177e4 3475{
36b77a52 3476 mutex_lock(&proto_list_mutex);
60f0438a 3477 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 3478}
3479
3480static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3481{
60f0438a 3482 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 3483}
3484
3485static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 3486 __releases(proto_list_mutex)
1da177e4 3487{
36b77a52 3488 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 3489}
3490
3491static char proto_method_implemented(const void *method)
3492{
3493 return method == NULL ? 'n' : 'y';
3494}
180d8cd9
GC		 3495static long sock_prot_memory_allocated(struct proto *proto)
3496{
cb75a36c 3497 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 3498}
3499
7a512eb8 3500static const char *sock_prot_memory_pressure(struct proto *proto)
180d8cd9
GC		 3501{
3502 return proto->memory_pressure != NULL ?
3503 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
3504}
1da177e4
LT		 3505
3506static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
3507{
180d8cd9 3508
8d987e5c 3509 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 3510 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3511 proto->name,
3512 proto->obj_size,
14e943db 3513 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 3514 sock_prot_memory_allocated(proto),
3515 sock_prot_memory_pressure(proto),
1da177e4
LT		 3516 proto->max_header,
3517 proto->slab == NULL ? "no" : "yes",
3518 module_name(proto->owner),
3519 proto_method_implemented(proto->close),
3520 proto_method_implemented(proto->connect),
3521 proto_method_implemented(proto->disconnect),
3522 proto_method_implemented(proto->accept),
3523 proto_method_implemented(proto->ioctl),
3524 proto_method_implemented(proto->init),
3525 proto_method_implemented(proto->destroy),
3526 proto_method_implemented(proto->shutdown),
3527 proto_method_implemented(proto->setsockopt),
3528 proto_method_implemented(proto->getsockopt),
3529 proto_method_implemented(proto->sendmsg),
3530 proto_method_implemented(proto->recvmsg),
3531 proto_method_implemented(proto->sendpage),
3532 proto_method_implemented(proto->bind),
3533 proto_method_implemented(proto->backlog_rcv),
3534 proto_method_implemented(proto->hash),
3535 proto_method_implemented(proto->unhash),
3536 proto_method_implemented(proto->get_port),
3537 proto_method_implemented(proto->enter_memory_pressure));
3538}
3539
3540static int proto_seq_show(struct seq_file *seq, void *v)
3541{
60f0438a 3542 if (v == &proto_list)
1da177e4
LT		 3543 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3544 "protocol",
3545 "size",
3546 "sockets",
3547 "memory",
3548 "press",
3549 "maxhdr",
3550 "slab",
3551 "module",
3552 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3553 else
60f0438a 3554 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 3555 return 0;
3556}
3557
f690808e 3558static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 3559 .start = proto_seq_start,
3560 .next = proto_seq_next,
3561 .stop = proto_seq_stop,
3562 .show = proto_seq_show,
3563};
3564
14e943db
ED		 3565static __net_init int proto_init_net(struct net *net)
3566{
c3506372
CH		 3567 if (!proc_create_net("protocols", 0444, net->proc_net, &proto_seq_ops,
3568 sizeof(struct seq_net_private)))
14e943db
ED		 3569 return -ENOMEM;
3570
3571 return 0;
3572}
3573
3574static __net_exit void proto_exit_net(struct net *net)
3575{
ece31ffd 3576 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 3577}
3578
3579
3580static __net_initdata struct pernet_operations proto_net_ops = {
3581 .init = proto_init_net,
3582 .exit = proto_exit_net,
1da177e4
LT		 3583};
3584
3585static int __init proto_init(void)
3586{
14e943db 3587 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 3588}
3589
3590subsys_initcall(proto_init);
3591
3592#endif /* PROC_FS */
7db6b048
SS		 3593
3594#ifdef CONFIG_NET_RX_BUSY_POLL
3595bool sk_busy_loop_end(void *p, unsigned long start_time)
3596{
3597 struct sock *sk = p;
3598
3599 return !skb_queue_empty(&sk->sk_receive_queue) ||
3600 sk_busy_loop_timeout(sk, start_time);
3601}
3602EXPORT_SYMBOL(sk_busy_loop_end);
3603#endif /* CONFIG_NET_RX_BUSY_POLL */
Linux 6.x block layer and io_uring tree(s)