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1// SPDX-License-Identifier: GPL-2.0-or-later
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 *
10 * Authors: Ross Biro
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
35 * code. The ACK stuff can wait and needs major
36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 */
85
86#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
87
88#include <asm/unaligned.h>
89#include <linux/capability.h>
90#include <linux/errno.h>
91#include <linux/errqueue.h>
92#include <linux/types.h>
93#include <linux/socket.h>
94#include <linux/in.h>
95#include <linux/kernel.h>
96#include <linux/module.h>
97#include <linux/proc_fs.h>
98#include <linux/seq_file.h>
99#include <linux/sched.h>
100#include <linux/sched/mm.h>
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/udp.h>
111#include <linux/init.h>
112#include <linux/highmem.h>
113#include <linux/user_namespace.h>
114#include <linux/static_key.h>
115#include <linux/memcontrol.h>
116#include <linux/prefetch.h>
117#include <linux/compat.h>
118#include <linux/mroute.h>
119#include <linux/mroute6.h>
120#include <linux/icmpv6.h>
121
122#include <linux/uaccess.h>
123
124#include <linux/netdevice.h>
125#include <net/protocol.h>
126#include <linux/skbuff.h>
127#include <net/net_namespace.h>
128#include <net/request_sock.h>
129#include <net/sock.h>
130#include <linux/net_tstamp.h>
131#include <net/xfrm.h>
132#include <linux/ipsec.h>
133#include <net/cls_cgroup.h>
134#include <net/netprio_cgroup.h>
135#include <linux/sock_diag.h>
136
137#include <linux/filter.h>
138#include <net/sock_reuseport.h>
139#include <net/bpf_sk_storage.h>
140
141#include <trace/events/sock.h>
142
143#include <net/tcp.h>
144#include <net/busy_poll.h>
145#include <net/phonet/phonet.h>
146
147#include <linux/ethtool.h>
148
149#include "dev.h"
150
151static DEFINE_MUTEX(proto_list_mutex);
152static LIST_HEAD(proto_list);
153
154static void sock_def_write_space_wfree(struct sock *sk);
155static void sock_def_write_space(struct sock *sk);
156
157/**
158 * sk_ns_capable - General socket capability test
159 * @sk: Socket to use a capability on or through
160 * @user_ns: The user namespace of the capability to use
161 * @cap: The capability to use
162 *
163 * Test to see if the opener of the socket had when the socket was
164 * created and the current process has the capability @cap in the user
165 * namespace @user_ns.
166 */
167bool sk_ns_capable(const struct sock *sk,
168 struct user_namespace *user_ns, int cap)
169{
170 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
171 ns_capable(user_ns, cap);
172}
173EXPORT_SYMBOL(sk_ns_capable);
174
175/**
176 * sk_capable - Socket global capability test
177 * @sk: Socket to use a capability on or through
178 * @cap: The global capability to use
179 *
180 * Test to see if the opener of the socket had when the socket was
181 * created and the current process has the capability @cap in all user
182 * namespaces.
183 */
184bool sk_capable(const struct sock *sk, int cap)
185{
186 return sk_ns_capable(sk, &init_user_ns, cap);
187}
188EXPORT_SYMBOL(sk_capable);
189
190/**
191 * sk_net_capable - Network namespace socket capability test
192 * @sk: Socket to use a capability on or through
193 * @cap: The capability to use
194 *
195 * Test to see if the opener of the socket had when the socket was created
196 * and the current process has the capability @cap over the network namespace
197 * the socket is a member of.
198 */
199bool sk_net_capable(const struct sock *sk, int cap)
200{
201 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
202}
203EXPORT_SYMBOL(sk_net_capable);
204
205/*
206 * Each address family might have different locking rules, so we have
207 * one slock key per address family and separate keys for internal and
208 * userspace sockets.
209 */
210static struct lock_class_key af_family_keys[AF_MAX];
211static struct lock_class_key af_family_kern_keys[AF_MAX];
212static struct lock_class_key af_family_slock_keys[AF_MAX];
213static struct lock_class_key af_family_kern_slock_keys[AF_MAX];
214
215/*
216 * Make lock validator output more readable. (we pre-construct these
217 * strings build-time, so that runtime initialization of socket
218 * locks is fast):
219 */
220
221#define _sock_locks(x) \
222 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \
223 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \
224 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \
225 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \
226 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \
227 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \
228 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \
229 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \
230 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \
231 x "27" , x "28" , x "AF_CAN" , \
232 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \
233 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \
234 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \
235 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \
236 x "AF_QIPCRTR", x "AF_SMC" , x "AF_XDP" , \
237 x "AF_MCTP" , \
238 x "AF_MAX"
239
240static const char *const af_family_key_strings[AF_MAX+1] = {
241 _sock_locks("sk_lock-")
242};
243static const char *const af_family_slock_key_strings[AF_MAX+1] = {
244 _sock_locks("slock-")
245};
246static const char *const af_family_clock_key_strings[AF_MAX+1] = {
247 _sock_locks("clock-")
248};
249
250static const char *const af_family_kern_key_strings[AF_MAX+1] = {
251 _sock_locks("k-sk_lock-")
252};
253static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = {
254 _sock_locks("k-slock-")
255};
256static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = {
257 _sock_locks("k-clock-")
258};
259static const char *const af_family_rlock_key_strings[AF_MAX+1] = {
260 _sock_locks("rlock-")
261};
262static const char *const af_family_wlock_key_strings[AF_MAX+1] = {
263 _sock_locks("wlock-")
264};
265static const char *const af_family_elock_key_strings[AF_MAX+1] = {
266 _sock_locks("elock-")
267};
268
269/*
270 * sk_callback_lock and sk queues locking rules are per-address-family,
271 * so split the lock classes by using a per-AF key:
272 */
273static struct lock_class_key af_callback_keys[AF_MAX];
274static struct lock_class_key af_rlock_keys[AF_MAX];
275static struct lock_class_key af_wlock_keys[AF_MAX];
276static struct lock_class_key af_elock_keys[AF_MAX];
277static struct lock_class_key af_kern_callback_keys[AF_MAX];
278
279/* Run time adjustable parameters. */
280__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
281EXPORT_SYMBOL(sysctl_wmem_max);
282__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
283EXPORT_SYMBOL(sysctl_rmem_max);
284__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
285__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
286
287int sysctl_tstamp_allow_data __read_mostly = 1;
288
289DEFINE_STATIC_KEY_FALSE(memalloc_socks_key);
290EXPORT_SYMBOL_GPL(memalloc_socks_key);
291
292/**
293 * sk_set_memalloc - sets %SOCK_MEMALLOC
294 * @sk: socket to set it on
295 *
296 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
297 * It's the responsibility of the admin to adjust min_free_kbytes
298 * to meet the requirements
299 */
300void sk_set_memalloc(struct sock *sk)
301{
302 sock_set_flag(sk, SOCK_MEMALLOC);
303 sk->sk_allocation |= __GFP_MEMALLOC;
304 static_branch_inc(&memalloc_socks_key);
305}
306EXPORT_SYMBOL_GPL(sk_set_memalloc);
307
308void sk_clear_memalloc(struct sock *sk)
309{
310 sock_reset_flag(sk, SOCK_MEMALLOC);
311 sk->sk_allocation &= ~__GFP_MEMALLOC;
312 static_branch_dec(&memalloc_socks_key);
313
314 /*
315 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
316 * progress of swapping. SOCK_MEMALLOC may be cleared while
317 * it has rmem allocations due to the last swapfile being deactivated
318 * but there is a risk that the socket is unusable due to exceeding
319 * the rmem limits. Reclaim the reserves and obey rmem limits again.
320 */
321 sk_mem_reclaim(sk);
322}
323EXPORT_SYMBOL_GPL(sk_clear_memalloc);
324
325int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
326{
327 int ret;
328 unsigned int noreclaim_flag;
329
330 /* these should have been dropped before queueing */
331 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
332
333 noreclaim_flag = memalloc_noreclaim_save();
334 ret = INDIRECT_CALL_INET(sk->sk_backlog_rcv,
335 tcp_v6_do_rcv,
336 tcp_v4_do_rcv,
337 sk, skb);
338 memalloc_noreclaim_restore(noreclaim_flag);
339
340 return ret;
341}
342EXPORT_SYMBOL(__sk_backlog_rcv);
343
344void sk_error_report(struct sock *sk)
345{
346 sk->sk_error_report(sk);
347
348 switch (sk->sk_family) {
349 case AF_INET:
350 fallthrough;
351 case AF_INET6:
352 trace_inet_sk_error_report(sk);
353 break;
354 default:
355 break;
356 }
357}
358EXPORT_SYMBOL(sk_error_report);
359
360int sock_get_timeout(long timeo, void *optval, bool old_timeval)
361{
362 struct __kernel_sock_timeval tv;
363
364 if (timeo == MAX_SCHEDULE_TIMEOUT) {
365 tv.tv_sec = 0;
366 tv.tv_usec = 0;
367 } else {
368 tv.tv_sec = timeo / HZ;
369 tv.tv_usec = ((timeo % HZ) * USEC_PER_SEC) / HZ;
370 }
371
372 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
373 struct old_timeval32 tv32 = { tv.tv_sec, tv.tv_usec };
374 *(struct old_timeval32 *)optval = tv32;
375 return sizeof(tv32);
376 }
377
378 if (old_timeval) {
379 struct __kernel_old_timeval old_tv;
380 old_tv.tv_sec = tv.tv_sec;
381 old_tv.tv_usec = tv.tv_usec;
382 *(struct __kernel_old_timeval *)optval = old_tv;
383 return sizeof(old_tv);
384 }
385
386 *(struct __kernel_sock_timeval *)optval = tv;
387 return sizeof(tv);
388}
389EXPORT_SYMBOL(sock_get_timeout);
390
391int sock_copy_user_timeval(struct __kernel_sock_timeval *tv,
392 sockptr_t optval, int optlen, bool old_timeval)
393{
394 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
395 struct old_timeval32 tv32;
396
397 if (optlen < sizeof(tv32))
398 return -EINVAL;
399
400 if (copy_from_sockptr(&tv32, optval, sizeof(tv32)))
401 return -EFAULT;
402 tv->tv_sec = tv32.tv_sec;
403 tv->tv_usec = tv32.tv_usec;
404 } else if (old_timeval) {
405 struct __kernel_old_timeval old_tv;
406
407 if (optlen < sizeof(old_tv))
408 return -EINVAL;
409 if (copy_from_sockptr(&old_tv, optval, sizeof(old_tv)))
410 return -EFAULT;
411 tv->tv_sec = old_tv.tv_sec;
412 tv->tv_usec = old_tv.tv_usec;
413 } else {
414 if (optlen < sizeof(*tv))
415 return -EINVAL;
416 if (copy_from_sockptr(tv, optval, sizeof(*tv)))
417 return -EFAULT;
418 }
419
420 return 0;
421}
422EXPORT_SYMBOL(sock_copy_user_timeval);
423
424static int sock_set_timeout(long *timeo_p, sockptr_t optval, int optlen,
425 bool old_timeval)
426{
427 struct __kernel_sock_timeval tv;
428 int err = sock_copy_user_timeval(&tv, optval, optlen, old_timeval);
429 long val;
430
431 if (err)
432 return err;
433
434 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
435 return -EDOM;
436
437 if (tv.tv_sec < 0) {
438 static int warned __read_mostly;
439
440 WRITE_ONCE(*timeo_p, 0);
441 if (warned < 10 && net_ratelimit()) {
442 warned++;
443 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
444 __func__, current->comm, task_pid_nr(current));
445 }
446 return 0;
447 }
448 val = MAX_SCHEDULE_TIMEOUT;
449 if ((tv.tv_sec || tv.tv_usec) &&
450 (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)))
451 val = tv.tv_sec * HZ + DIV_ROUND_UP((unsigned long)tv.tv_usec,
452 USEC_PER_SEC / HZ);
453 WRITE_ONCE(*timeo_p, val);
454 return 0;
455}
456
457static bool sock_needs_netstamp(const struct sock *sk)
458{
459 switch (sk->sk_family) {
460 case AF_UNSPEC:
461 case AF_UNIX:
462 return false;
463 default:
464 return true;
465 }
466}
467
468static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
469{
470 if (sk->sk_flags & flags) {
471 sk->sk_flags &= ~flags;
472 if (sock_needs_netstamp(sk) &&
473 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
474 net_disable_timestamp();
475 }
476}
477
478
479int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
480{
481 unsigned long flags;
482 struct sk_buff_head *list = &sk->sk_receive_queue;
483
484 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
485 atomic_inc(&sk->sk_drops);
486 trace_sock_rcvqueue_full(sk, skb);
487 return -ENOMEM;
488 }
489
490 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
491 atomic_inc(&sk->sk_drops);
492 return -ENOBUFS;
493 }
494
495 skb->dev = NULL;
496 skb_set_owner_r(skb, sk);
497
498 /* we escape from rcu protected region, make sure we dont leak
499 * a norefcounted dst
500 */
501 skb_dst_force(skb);
502
503 spin_lock_irqsave(&list->lock, flags);
504 sock_skb_set_dropcount(sk, skb);
505 __skb_queue_tail(list, skb);
506 spin_unlock_irqrestore(&list->lock, flags);
507
508 if (!sock_flag(sk, SOCK_DEAD))
509 sk->sk_data_ready(sk);
510 return 0;
511}
512EXPORT_SYMBOL(__sock_queue_rcv_skb);
513
514int sock_queue_rcv_skb_reason(struct sock *sk, struct sk_buff *skb,
515 enum skb_drop_reason *reason)
516{
517 enum skb_drop_reason drop_reason;
518 int err;
519
520 err = sk_filter(sk, skb);
521 if (err) {
522 drop_reason = SKB_DROP_REASON_SOCKET_FILTER;
523 goto out;
524 }
525 err = __sock_queue_rcv_skb(sk, skb);
526 switch (err) {
527 case -ENOMEM:
528 drop_reason = SKB_DROP_REASON_SOCKET_RCVBUFF;
529 break;
530 case -ENOBUFS:
531 drop_reason = SKB_DROP_REASON_PROTO_MEM;
532 break;
533 default:
534 drop_reason = SKB_NOT_DROPPED_YET;
535 break;
536 }
537out:
538 if (reason)
539 *reason = drop_reason;
540 return err;
541}
542EXPORT_SYMBOL(sock_queue_rcv_skb_reason);
543
544int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
545 const int nested, unsigned int trim_cap, bool refcounted)
546{
547 int rc = NET_RX_SUCCESS;
548
549 if (sk_filter_trim_cap(sk, skb, trim_cap))
550 goto discard_and_relse;
551
552 skb->dev = NULL;
553
554 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
555 atomic_inc(&sk->sk_drops);
556 goto discard_and_relse;
557 }
558 if (nested)
559 bh_lock_sock_nested(sk);
560 else
561 bh_lock_sock(sk);
562 if (!sock_owned_by_user(sk)) {
563 /*
564 * trylock + unlock semantics:
565 */
566 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
567
568 rc = sk_backlog_rcv(sk, skb);
569
570 mutex_release(&sk->sk_lock.dep_map, _RET_IP_);
571 } else if (sk_add_backlog(sk, skb, READ_ONCE(sk->sk_rcvbuf))) {
572 bh_unlock_sock(sk);
573 atomic_inc(&sk->sk_drops);
574 goto discard_and_relse;
575 }
576
577 bh_unlock_sock(sk);
578out:
579 if (refcounted)
580 sock_put(sk);
581 return rc;
582discard_and_relse:
583 kfree_skb(skb);
584 goto out;
585}
586EXPORT_SYMBOL(__sk_receive_skb);
587
588INDIRECT_CALLABLE_DECLARE(struct dst_entry *ip6_dst_check(struct dst_entry *,
589 u32));
590INDIRECT_CALLABLE_DECLARE(struct dst_entry *ipv4_dst_check(struct dst_entry *,
591 u32));
592struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
593{
594 struct dst_entry *dst = __sk_dst_get(sk);
595
596 if (dst && dst->obsolete &&
597 INDIRECT_CALL_INET(dst->ops->check, ip6_dst_check, ipv4_dst_check,
598 dst, cookie) == NULL) {
599 sk_tx_queue_clear(sk);
600 WRITE_ONCE(sk->sk_dst_pending_confirm, 0);
601 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
602 dst_release(dst);
603 return NULL;
604 }
605
606 return dst;
607}
608EXPORT_SYMBOL(__sk_dst_check);
609
610struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
611{
612 struct dst_entry *dst = sk_dst_get(sk);
613
614 if (dst && dst->obsolete &&
615 INDIRECT_CALL_INET(dst->ops->check, ip6_dst_check, ipv4_dst_check,
616 dst, cookie) == NULL) {
617 sk_dst_reset(sk);
618 dst_release(dst);
619 return NULL;
620 }
621
622 return dst;
623}
624EXPORT_SYMBOL(sk_dst_check);
625
626static int sock_bindtoindex_locked(struct sock *sk, int ifindex)
627{
628 int ret = -ENOPROTOOPT;
629#ifdef CONFIG_NETDEVICES
630 struct net *net = sock_net(sk);
631
632 /* Sorry... */
633 ret = -EPERM;
634 if (sk->sk_bound_dev_if && !ns_capable(net->user_ns, CAP_NET_RAW))
635 goto out;
636
637 ret = -EINVAL;
638 if (ifindex < 0)
639 goto out;
640
641 /* Paired with all READ_ONCE() done locklessly. */
642 WRITE_ONCE(sk->sk_bound_dev_if, ifindex);
643
644 if (sk->sk_prot->rehash)
645 sk->sk_prot->rehash(sk);
646 sk_dst_reset(sk);
647
648 ret = 0;
649
650out:
651#endif
652
653 return ret;
654}
655
656int sock_bindtoindex(struct sock *sk, int ifindex, bool lock_sk)
657{
658 int ret;
659
660 if (lock_sk)
661 lock_sock(sk);
662 ret = sock_bindtoindex_locked(sk, ifindex);
663 if (lock_sk)
664 release_sock(sk);
665
666 return ret;
667}
668EXPORT_SYMBOL(sock_bindtoindex);
669
670static int sock_setbindtodevice(struct sock *sk, sockptr_t optval, int optlen)
671{
672 int ret = -ENOPROTOOPT;
673#ifdef CONFIG_NETDEVICES
674 struct net *net = sock_net(sk);
675 char devname[IFNAMSIZ];
676 int index;
677
678 ret = -EINVAL;
679 if (optlen < 0)
680 goto out;
681
682 /* Bind this socket to a particular device like "eth0",
683 * as specified in the passed interface name. If the
684 * name is "" or the option length is zero the socket
685 * is not bound.
686 */
687 if (optlen > IFNAMSIZ - 1)
688 optlen = IFNAMSIZ - 1;
689 memset(devname, 0, sizeof(devname));
690
691 ret = -EFAULT;
692 if (copy_from_sockptr(devname, optval, optlen))
693 goto out;
694
695 index = 0;
696 if (devname[0] != '\0') {
697 struct net_device *dev;
698
699 rcu_read_lock();
700 dev = dev_get_by_name_rcu(net, devname);
701 if (dev)
702 index = dev->ifindex;
703 rcu_read_unlock();
704 ret = -ENODEV;
705 if (!dev)
706 goto out;
707 }
708
709 sockopt_lock_sock(sk);
710 ret = sock_bindtoindex_locked(sk, index);
711 sockopt_release_sock(sk);
712out:
713#endif
714
715 return ret;
716}
717
718static int sock_getbindtodevice(struct sock *sk, sockptr_t optval,
719 sockptr_t optlen, int len)
720{
721 int ret = -ENOPROTOOPT;
722#ifdef CONFIG_NETDEVICES
723 int bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
724 struct net *net = sock_net(sk);
725 char devname[IFNAMSIZ];
726
727 if (bound_dev_if == 0) {
728 len = 0;
729 goto zero;
730 }
731
732 ret = -EINVAL;
733 if (len < IFNAMSIZ)
734 goto out;
735
736 ret = netdev_get_name(net, devname, bound_dev_if);
737 if (ret)
738 goto out;
739
740 len = strlen(devname) + 1;
741
742 ret = -EFAULT;
743 if (copy_to_sockptr(optval, devname, len))
744 goto out;
745
746zero:
747 ret = -EFAULT;
748 if (copy_to_sockptr(optlen, &len, sizeof(int)))
749 goto out;
750
751 ret = 0;
752
753out:
754#endif
755
756 return ret;
757}
758
759bool sk_mc_loop(const struct sock *sk)
760{
761 if (dev_recursion_level())
762 return false;
763 if (!sk)
764 return true;
765 /* IPV6_ADDRFORM can change sk->sk_family under us. */
766 switch (READ_ONCE(sk->sk_family)) {
767 case AF_INET:
768 return inet_test_bit(MC_LOOP, sk);
769#if IS_ENABLED(CONFIG_IPV6)
770 case AF_INET6:
771 return inet6_test_bit(MC6_LOOP, sk);
772#endif
773 }
774 WARN_ON_ONCE(1);
775 return true;
776}
777EXPORT_SYMBOL(sk_mc_loop);
778
779void sock_set_reuseaddr(struct sock *sk)
780{
781 lock_sock(sk);
782 sk->sk_reuse = SK_CAN_REUSE;
783 release_sock(sk);
784}
785EXPORT_SYMBOL(sock_set_reuseaddr);
786
787void sock_set_reuseport(struct sock *sk)
788{
789 lock_sock(sk);
790 sk->sk_reuseport = true;
791 release_sock(sk);
792}
793EXPORT_SYMBOL(sock_set_reuseport);
794
795void sock_no_linger(struct sock *sk)
796{
797 lock_sock(sk);
798 WRITE_ONCE(sk->sk_lingertime, 0);
799 sock_set_flag(sk, SOCK_LINGER);
800 release_sock(sk);
801}
802EXPORT_SYMBOL(sock_no_linger);
803
804void sock_set_priority(struct sock *sk, u32 priority)
805{
806 WRITE_ONCE(sk->sk_priority, priority);
807}
808EXPORT_SYMBOL(sock_set_priority);
809
810void sock_set_sndtimeo(struct sock *sk, s64 secs)
811{
812 lock_sock(sk);
813 if (secs && secs < MAX_SCHEDULE_TIMEOUT / HZ - 1)
814 WRITE_ONCE(sk->sk_sndtimeo, secs * HZ);
815 else
816 WRITE_ONCE(sk->sk_sndtimeo, MAX_SCHEDULE_TIMEOUT);
817 release_sock(sk);
818}
819EXPORT_SYMBOL(sock_set_sndtimeo);
820
821static void __sock_set_timestamps(struct sock *sk, bool val, bool new, bool ns)
822{
823 if (val) {
824 sock_valbool_flag(sk, SOCK_TSTAMP_NEW, new);
825 sock_valbool_flag(sk, SOCK_RCVTSTAMPNS, ns);
826 sock_set_flag(sk, SOCK_RCVTSTAMP);
827 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
828 } else {
829 sock_reset_flag(sk, SOCK_RCVTSTAMP);
830 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
831 }
832}
833
834void sock_enable_timestamps(struct sock *sk)
835{
836 lock_sock(sk);
837 __sock_set_timestamps(sk, true, false, true);
838 release_sock(sk);
839}
840EXPORT_SYMBOL(sock_enable_timestamps);
841
842void sock_set_timestamp(struct sock *sk, int optname, bool valbool)
843{
844 switch (optname) {
845 case SO_TIMESTAMP_OLD:
846 __sock_set_timestamps(sk, valbool, false, false);
847 break;
848 case SO_TIMESTAMP_NEW:
849 __sock_set_timestamps(sk, valbool, true, false);
850 break;
851 case SO_TIMESTAMPNS_OLD:
852 __sock_set_timestamps(sk, valbool, false, true);
853 break;
854 case SO_TIMESTAMPNS_NEW:
855 __sock_set_timestamps(sk, valbool, true, true);
856 break;
857 }
858}
859
860static int sock_timestamping_bind_phc(struct sock *sk, int phc_index)
861{
862 struct net *net = sock_net(sk);
863 struct net_device *dev = NULL;
864 bool match = false;
865 int *vclock_index;
866 int i, num;
867
868 if (sk->sk_bound_dev_if)
869 dev = dev_get_by_index(net, sk->sk_bound_dev_if);
870
871 if (!dev) {
872 pr_err("%s: sock not bind to device\n", __func__);
873 return -EOPNOTSUPP;
874 }
875
876 num = ethtool_get_phc_vclocks(dev, &vclock_index);
877 dev_put(dev);
878
879 for (i = 0; i < num; i++) {
880 if (*(vclock_index + i) == phc_index) {
881 match = true;
882 break;
883 }
884 }
885
886 if (num > 0)
887 kfree(vclock_index);
888
889 if (!match)
890 return -EINVAL;
891
892 WRITE_ONCE(sk->sk_bind_phc, phc_index);
893
894 return 0;
895}
896
897int sock_set_timestamping(struct sock *sk, int optname,
898 struct so_timestamping timestamping)
899{
900 int val = timestamping.flags;
901 int ret;
902
903 if (val & ~SOF_TIMESTAMPING_MASK)
904 return -EINVAL;
905
906 if (val & SOF_TIMESTAMPING_OPT_ID_TCP &&
907 !(val & SOF_TIMESTAMPING_OPT_ID))
908 return -EINVAL;
909
910 if (val & SOF_TIMESTAMPING_OPT_ID &&
911 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
912 if (sk_is_tcp(sk)) {
913 if ((1 << sk->sk_state) &
914 (TCPF_CLOSE | TCPF_LISTEN))
915 return -EINVAL;
916 if (val & SOF_TIMESTAMPING_OPT_ID_TCP)
917 atomic_set(&sk->sk_tskey, tcp_sk(sk)->write_seq);
918 else
919 atomic_set(&sk->sk_tskey, tcp_sk(sk)->snd_una);
920 } else {
921 atomic_set(&sk->sk_tskey, 0);
922 }
923 }
924
925 if (val & SOF_TIMESTAMPING_OPT_STATS &&
926 !(val & SOF_TIMESTAMPING_OPT_TSONLY))
927 return -EINVAL;
928
929 if (val & SOF_TIMESTAMPING_BIND_PHC) {
930 ret = sock_timestamping_bind_phc(sk, timestamping.bind_phc);
931 if (ret)
932 return ret;
933 }
934
935 WRITE_ONCE(sk->sk_tsflags, val);
936 sock_valbool_flag(sk, SOCK_TSTAMP_NEW, optname == SO_TIMESTAMPING_NEW);
937
938 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
939 sock_enable_timestamp(sk,
940 SOCK_TIMESTAMPING_RX_SOFTWARE);
941 else
942 sock_disable_timestamp(sk,
943 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
944 return 0;
945}
946
947void sock_set_keepalive(struct sock *sk)
948{
949 lock_sock(sk);
950 if (sk->sk_prot->keepalive)
951 sk->sk_prot->keepalive(sk, true);
952 sock_valbool_flag(sk, SOCK_KEEPOPEN, true);
953 release_sock(sk);
954}
955EXPORT_SYMBOL(sock_set_keepalive);
956
957static void __sock_set_rcvbuf(struct sock *sk, int val)
958{
959 /* Ensure val * 2 fits into an int, to prevent max_t() from treating it
960 * as a negative value.
961 */
962 val = min_t(int, val, INT_MAX / 2);
963 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
964
965 /* We double it on the way in to account for "struct sk_buff" etc.
966 * overhead. Applications assume that the SO_RCVBUF setting they make
967 * will allow that much actual data to be received on that socket.
968 *
969 * Applications are unaware that "struct sk_buff" and other overheads
970 * allocate from the receive buffer during socket buffer allocation.
971 *
972 * And after considering the possible alternatives, returning the value
973 * we actually used in getsockopt is the most desirable behavior.
974 */
975 WRITE_ONCE(sk->sk_rcvbuf, max_t(int, val * 2, SOCK_MIN_RCVBUF));
976}
977
978void sock_set_rcvbuf(struct sock *sk, int val)
979{
980 lock_sock(sk);
981 __sock_set_rcvbuf(sk, val);
982 release_sock(sk);
983}
984EXPORT_SYMBOL(sock_set_rcvbuf);
985
986static void __sock_set_mark(struct sock *sk, u32 val)
987{
988 if (val != sk->sk_mark) {
989 WRITE_ONCE(sk->sk_mark, val);
990 sk_dst_reset(sk);
991 }
992}
993
994void sock_set_mark(struct sock *sk, u32 val)
995{
996 lock_sock(sk);
997 __sock_set_mark(sk, val);
998 release_sock(sk);
999}
1000EXPORT_SYMBOL(sock_set_mark);
1001
1002static void sock_release_reserved_memory(struct sock *sk, int bytes)
1003{
1004 /* Round down bytes to multiple of pages */
1005 bytes = round_down(bytes, PAGE_SIZE);
1006
1007 WARN_ON(bytes > sk->sk_reserved_mem);
1008 WRITE_ONCE(sk->sk_reserved_mem, sk->sk_reserved_mem - bytes);
1009 sk_mem_reclaim(sk);
1010}
1011
1012static int sock_reserve_memory(struct sock *sk, int bytes)
1013{
1014 long allocated;
1015 bool charged;
1016 int pages;
1017
1018 if (!mem_cgroup_sockets_enabled || !sk->sk_memcg || !sk_has_account(sk))
1019 return -EOPNOTSUPP;
1020
1021 if (!bytes)
1022 return 0;
1023
1024 pages = sk_mem_pages(bytes);
1025
1026 /* pre-charge to memcg */
1027 charged = mem_cgroup_charge_skmem(sk->sk_memcg, pages,
1028 GFP_KERNEL | __GFP_RETRY_MAYFAIL);
1029 if (!charged)
1030 return -ENOMEM;
1031
1032 /* pre-charge to forward_alloc */
1033 sk_memory_allocated_add(sk, pages);
1034 allocated = sk_memory_allocated(sk);
1035 /* If the system goes into memory pressure with this
1036 * precharge, give up and return error.
1037 */
1038 if (allocated > sk_prot_mem_limits(sk, 1)) {
1039 sk_memory_allocated_sub(sk, pages);
1040 mem_cgroup_uncharge_skmem(sk->sk_memcg, pages);
1041 return -ENOMEM;
1042 }
1043 sk_forward_alloc_add(sk, pages << PAGE_SHIFT);
1044
1045 WRITE_ONCE(sk->sk_reserved_mem,
1046 sk->sk_reserved_mem + (pages << PAGE_SHIFT));
1047
1048 return 0;
1049}
1050
1051void sockopt_lock_sock(struct sock *sk)
1052{
1053 /* When current->bpf_ctx is set, the setsockopt is called from
1054 * a bpf prog. bpf has ensured the sk lock has been
1055 * acquired before calling setsockopt().
1056 */
1057 if (has_current_bpf_ctx())
1058 return;
1059
1060 lock_sock(sk);
1061}
1062EXPORT_SYMBOL(sockopt_lock_sock);
1063
1064void sockopt_release_sock(struct sock *sk)
1065{
1066 if (has_current_bpf_ctx())
1067 return;
1068
1069 release_sock(sk);
1070}
1071EXPORT_SYMBOL(sockopt_release_sock);
1072
1073bool sockopt_ns_capable(struct user_namespace *ns, int cap)
1074{
1075 return has_current_bpf_ctx() || ns_capable(ns, cap);
1076}
1077EXPORT_SYMBOL(sockopt_ns_capable);
1078
1079bool sockopt_capable(int cap)
1080{
1081 return has_current_bpf_ctx() || capable(cap);
1082}
1083EXPORT_SYMBOL(sockopt_capable);
1084
1085/*
1086 * This is meant for all protocols to use and covers goings on
1087 * at the socket level. Everything here is generic.
1088 */
1089
1090int sk_setsockopt(struct sock *sk, int level, int optname,
1091 sockptr_t optval, unsigned int optlen)
1092{
1093 struct so_timestamping timestamping;
1094 struct socket *sock = sk->sk_socket;
1095 struct sock_txtime sk_txtime;
1096 int val;
1097 int valbool;
1098 struct linger ling;
1099 int ret = 0;
1100
1101 /*
1102 * Options without arguments
1103 */
1104
1105 if (optname == SO_BINDTODEVICE)
1106 return sock_setbindtodevice(sk, optval, optlen);
1107
1108 if (optlen < sizeof(int))
1109 return -EINVAL;
1110
1111 if (copy_from_sockptr(&val, optval, sizeof(val)))
1112 return -EFAULT;
1113
1114 valbool = val ? 1 : 0;
1115
1116 /* handle options which do not require locking the socket. */
1117 switch (optname) {
1118 case SO_PRIORITY:
1119 if ((val >= 0 && val <= 6) ||
1120 sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) ||
1121 sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1122 sock_set_priority(sk, val);
1123 return 0;
1124 }
1125 return -EPERM;
1126 case SO_PASSSEC:
1127 assign_bit(SOCK_PASSSEC, &sock->flags, valbool);
1128 return 0;
1129 case SO_PASSCRED:
1130 assign_bit(SOCK_PASSCRED, &sock->flags, valbool);
1131 return 0;
1132 case SO_PASSPIDFD:
1133 assign_bit(SOCK_PASSPIDFD, &sock->flags, valbool);
1134 return 0;
1135 case SO_TYPE:
1136 case SO_PROTOCOL:
1137 case SO_DOMAIN:
1138 case SO_ERROR:
1139 return -ENOPROTOOPT;
1140#ifdef CONFIG_NET_RX_BUSY_POLL
1141 case SO_BUSY_POLL:
1142 if (val < 0)
1143 return -EINVAL;
1144 WRITE_ONCE(sk->sk_ll_usec, val);
1145 return 0;
1146 case SO_PREFER_BUSY_POLL:
1147 if (valbool && !sockopt_capable(CAP_NET_ADMIN))
1148 return -EPERM;
1149 WRITE_ONCE(sk->sk_prefer_busy_poll, valbool);
1150 return 0;
1151 case SO_BUSY_POLL_BUDGET:
1152 if (val > READ_ONCE(sk->sk_busy_poll_budget) &&
1153 !sockopt_capable(CAP_NET_ADMIN))
1154 return -EPERM;
1155 if (val < 0 || val > U16_MAX)
1156 return -EINVAL;
1157 WRITE_ONCE(sk->sk_busy_poll_budget, val);
1158 return 0;
1159#endif
1160 case SO_MAX_PACING_RATE:
1161 {
1162 unsigned long ulval = (val == ~0U) ? ~0UL : (unsigned int)val;
1163 unsigned long pacing_rate;
1164
1165 if (sizeof(ulval) != sizeof(val) &&
1166 optlen >= sizeof(ulval) &&
1167 copy_from_sockptr(&ulval, optval, sizeof(ulval))) {
1168 return -EFAULT;
1169 }
1170 if (ulval != ~0UL)
1171 cmpxchg(&sk->sk_pacing_status,
1172 SK_PACING_NONE,
1173 SK_PACING_NEEDED);
1174 /* Pairs with READ_ONCE() from sk_getsockopt() */
1175 WRITE_ONCE(sk->sk_max_pacing_rate, ulval);
1176 pacing_rate = READ_ONCE(sk->sk_pacing_rate);
1177 if (ulval < pacing_rate)
1178 WRITE_ONCE(sk->sk_pacing_rate, ulval);
1179 return 0;
1180 }
1181 case SO_TXREHASH:
1182 if (val < -1 || val > 1)
1183 return -EINVAL;
1184 if ((u8)val == SOCK_TXREHASH_DEFAULT)
1185 val = READ_ONCE(sock_net(sk)->core.sysctl_txrehash);
1186 /* Paired with READ_ONCE() in tcp_rtx_synack()
1187 * and sk_getsockopt().
1188 */
1189 WRITE_ONCE(sk->sk_txrehash, (u8)val);
1190 return 0;
1191 case SO_PEEK_OFF:
1192 {
1193 int (*set_peek_off)(struct sock *sk, int val);
1194
1195 set_peek_off = READ_ONCE(sock->ops)->set_peek_off;
1196 if (set_peek_off)
1197 ret = set_peek_off(sk, val);
1198 else
1199 ret = -EOPNOTSUPP;
1200 return ret;
1201 }
1202 }
1203
1204 sockopt_lock_sock(sk);
1205
1206 switch (optname) {
1207 case SO_DEBUG:
1208 if (val && !sockopt_capable(CAP_NET_ADMIN))
1209 ret = -EACCES;
1210 else
1211 sock_valbool_flag(sk, SOCK_DBG, valbool);
1212 break;
1213 case SO_REUSEADDR:
1214 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
1215 break;
1216 case SO_REUSEPORT:
1217 sk->sk_reuseport = valbool;
1218 break;
1219 case SO_DONTROUTE:
1220 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
1221 sk_dst_reset(sk);
1222 break;
1223 case SO_BROADCAST:
1224 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
1225 break;
1226 case SO_SNDBUF:
1227 /* Don't error on this BSD doesn't and if you think
1228 * about it this is right. Otherwise apps have to
1229 * play 'guess the biggest size' games. RCVBUF/SNDBUF
1230 * are treated in BSD as hints
1231 */
1232 val = min_t(u32, val, READ_ONCE(sysctl_wmem_max));
1233set_sndbuf:
1234 /* Ensure val * 2 fits into an int, to prevent max_t()
1235 * from treating it as a negative value.
1236 */
1237 val = min_t(int, val, INT_MAX / 2);
1238 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1239 WRITE_ONCE(sk->sk_sndbuf,
1240 max_t(int, val * 2, SOCK_MIN_SNDBUF));
1241 /* Wake up sending tasks if we upped the value. */
1242 sk->sk_write_space(sk);
1243 break;
1244
1245 case SO_SNDBUFFORCE:
1246 if (!sockopt_capable(CAP_NET_ADMIN)) {
1247 ret = -EPERM;
1248 break;
1249 }
1250
1251 /* No negative values (to prevent underflow, as val will be
1252 * multiplied by 2).
1253 */
1254 if (val < 0)
1255 val = 0;
1256 goto set_sndbuf;
1257
1258 case SO_RCVBUF:
1259 /* Don't error on this BSD doesn't and if you think
1260 * about it this is right. Otherwise apps have to
1261 * play 'guess the biggest size' games. RCVBUF/SNDBUF
1262 * are treated in BSD as hints
1263 */
1264 __sock_set_rcvbuf(sk, min_t(u32, val, READ_ONCE(sysctl_rmem_max)));
1265 break;
1266
1267 case SO_RCVBUFFORCE:
1268 if (!sockopt_capable(CAP_NET_ADMIN)) {
1269 ret = -EPERM;
1270 break;
1271 }
1272
1273 /* No negative values (to prevent underflow, as val will be
1274 * multiplied by 2).
1275 */
1276 __sock_set_rcvbuf(sk, max(val, 0));
1277 break;
1278
1279 case SO_KEEPALIVE:
1280 if (sk->sk_prot->keepalive)
1281 sk->sk_prot->keepalive(sk, valbool);
1282 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
1283 break;
1284
1285 case SO_OOBINLINE:
1286 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
1287 break;
1288
1289 case SO_NO_CHECK:
1290 sk->sk_no_check_tx = valbool;
1291 break;
1292
1293 case SO_LINGER:
1294 if (optlen < sizeof(ling)) {
1295 ret = -EINVAL; /* 1003.1g */
1296 break;
1297 }
1298 if (copy_from_sockptr(&ling, optval, sizeof(ling))) {
1299 ret = -EFAULT;
1300 break;
1301 }
1302 if (!ling.l_onoff) {
1303 sock_reset_flag(sk, SOCK_LINGER);
1304 } else {
1305 unsigned long t_sec = ling.l_linger;
1306
1307 if (t_sec >= MAX_SCHEDULE_TIMEOUT / HZ)
1308 WRITE_ONCE(sk->sk_lingertime, MAX_SCHEDULE_TIMEOUT);
1309 else
1310 WRITE_ONCE(sk->sk_lingertime, t_sec * HZ);
1311 sock_set_flag(sk, SOCK_LINGER);
1312 }
1313 break;
1314
1315 case SO_BSDCOMPAT:
1316 break;
1317
1318 case SO_TIMESTAMP_OLD:
1319 case SO_TIMESTAMP_NEW:
1320 case SO_TIMESTAMPNS_OLD:
1321 case SO_TIMESTAMPNS_NEW:
1322 sock_set_timestamp(sk, optname, valbool);
1323 break;
1324
1325 case SO_TIMESTAMPING_NEW:
1326 case SO_TIMESTAMPING_OLD:
1327 if (optlen == sizeof(timestamping)) {
1328 if (copy_from_sockptr(×tamping, optval,
1329 sizeof(timestamping))) {
1330 ret = -EFAULT;
1331 break;
1332 }
1333 } else {
1334 memset(×tamping, 0, sizeof(timestamping));
1335 timestamping.flags = val;
1336 }
1337 ret = sock_set_timestamping(sk, optname, timestamping);
1338 break;
1339
1340 case SO_RCVLOWAT:
1341 {
1342 int (*set_rcvlowat)(struct sock *sk, int val) = NULL;
1343
1344 if (val < 0)
1345 val = INT_MAX;
1346 if (sock)
1347 set_rcvlowat = READ_ONCE(sock->ops)->set_rcvlowat;
1348 if (set_rcvlowat)
1349 ret = set_rcvlowat(sk, val);
1350 else
1351 WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
1352 break;
1353 }
1354 case SO_RCVTIMEO_OLD:
1355 case SO_RCVTIMEO_NEW:
1356 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval,
1357 optlen, optname == SO_RCVTIMEO_OLD);
1358 break;
1359
1360 case SO_SNDTIMEO_OLD:
1361 case SO_SNDTIMEO_NEW:
1362 ret = sock_set_timeout(&sk->sk_sndtimeo, optval,
1363 optlen, optname == SO_SNDTIMEO_OLD);
1364 break;
1365
1366 case SO_ATTACH_FILTER: {
1367 struct sock_fprog fprog;
1368
1369 ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
1370 if (!ret)
1371 ret = sk_attach_filter(&fprog, sk);
1372 break;
1373 }
1374 case SO_ATTACH_BPF:
1375 ret = -EINVAL;
1376 if (optlen == sizeof(u32)) {
1377 u32 ufd;
1378
1379 ret = -EFAULT;
1380 if (copy_from_sockptr(&ufd, optval, sizeof(ufd)))
1381 break;
1382
1383 ret = sk_attach_bpf(ufd, sk);
1384 }
1385 break;
1386
1387 case SO_ATTACH_REUSEPORT_CBPF: {
1388 struct sock_fprog fprog;
1389
1390 ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
1391 if (!ret)
1392 ret = sk_reuseport_attach_filter(&fprog, sk);
1393 break;
1394 }
1395 case SO_ATTACH_REUSEPORT_EBPF:
1396 ret = -EINVAL;
1397 if (optlen == sizeof(u32)) {
1398 u32 ufd;
1399
1400 ret = -EFAULT;
1401 if (copy_from_sockptr(&ufd, optval, sizeof(ufd)))
1402 break;
1403
1404 ret = sk_reuseport_attach_bpf(ufd, sk);
1405 }
1406 break;
1407
1408 case SO_DETACH_REUSEPORT_BPF:
1409 ret = reuseport_detach_prog(sk);
1410 break;
1411
1412 case SO_DETACH_FILTER:
1413 ret = sk_detach_filter(sk);
1414 break;
1415
1416 case SO_LOCK_FILTER:
1417 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
1418 ret = -EPERM;
1419 else
1420 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
1421 break;
1422
1423 case SO_MARK:
1424 if (!sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1425 !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1426 ret = -EPERM;
1427 break;
1428 }
1429
1430 __sock_set_mark(sk, val);
1431 break;
1432 case SO_RCVMARK:
1433 sock_valbool_flag(sk, SOCK_RCVMARK, valbool);
1434 break;
1435
1436 case SO_RXQ_OVFL:
1437 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
1438 break;
1439
1440 case SO_WIFI_STATUS:
1441 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
1442 break;
1443
1444 case SO_NOFCS:
1445 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
1446 break;
1447
1448 case SO_SELECT_ERR_QUEUE:
1449 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
1450 break;
1451
1452
1453 case SO_INCOMING_CPU:
1454 reuseport_update_incoming_cpu(sk, val);
1455 break;
1456
1457 case SO_CNX_ADVICE:
1458 if (val == 1)
1459 dst_negative_advice(sk);
1460 break;
1461
1462 case SO_ZEROCOPY:
1463 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) {
1464 if (!(sk_is_tcp(sk) ||
1465 (sk->sk_type == SOCK_DGRAM &&
1466 sk->sk_protocol == IPPROTO_UDP)))
1467 ret = -EOPNOTSUPP;
1468 } else if (sk->sk_family != PF_RDS) {
1469 ret = -EOPNOTSUPP;
1470 }
1471 if (!ret) {
1472 if (val < 0 || val > 1)
1473 ret = -EINVAL;
1474 else
1475 sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool);
1476 }
1477 break;
1478
1479 case SO_TXTIME:
1480 if (optlen != sizeof(struct sock_txtime)) {
1481 ret = -EINVAL;
1482 break;
1483 } else if (copy_from_sockptr(&sk_txtime, optval,
1484 sizeof(struct sock_txtime))) {
1485 ret = -EFAULT;
1486 break;
1487 } else if (sk_txtime.flags & ~SOF_TXTIME_FLAGS_MASK) {
1488 ret = -EINVAL;
1489 break;
1490 }
1491 /* CLOCK_MONOTONIC is only used by sch_fq, and this packet
1492 * scheduler has enough safe guards.
1493 */
1494 if (sk_txtime.clockid != CLOCK_MONOTONIC &&
1495 !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1496 ret = -EPERM;
1497 break;
1498 }
1499 sock_valbool_flag(sk, SOCK_TXTIME, true);
1500 sk->sk_clockid = sk_txtime.clockid;
1501 sk->sk_txtime_deadline_mode =
1502 !!(sk_txtime.flags & SOF_TXTIME_DEADLINE_MODE);
1503 sk->sk_txtime_report_errors =
1504 !!(sk_txtime.flags & SOF_TXTIME_REPORT_ERRORS);
1505 break;
1506
1507 case SO_BINDTOIFINDEX:
1508 ret = sock_bindtoindex_locked(sk, val);
1509 break;
1510
1511 case SO_BUF_LOCK:
1512 if (val & ~SOCK_BUF_LOCK_MASK) {
1513 ret = -EINVAL;
1514 break;
1515 }
1516 sk->sk_userlocks = val | (sk->sk_userlocks &
1517 ~SOCK_BUF_LOCK_MASK);
1518 break;
1519
1520 case SO_RESERVE_MEM:
1521 {
1522 int delta;
1523
1524 if (val < 0) {
1525 ret = -EINVAL;
1526 break;
1527 }
1528
1529 delta = val - sk->sk_reserved_mem;
1530 if (delta < 0)
1531 sock_release_reserved_memory(sk, -delta);
1532 else
1533 ret = sock_reserve_memory(sk, delta);
1534 break;
1535 }
1536
1537 default:
1538 ret = -ENOPROTOOPT;
1539 break;
1540 }
1541 sockopt_release_sock(sk);
1542 return ret;
1543}
1544
1545int sock_setsockopt(struct socket *sock, int level, int optname,
1546 sockptr_t optval, unsigned int optlen)
1547{
1548 return sk_setsockopt(sock->sk, level, optname,
1549 optval, optlen);
1550}
1551EXPORT_SYMBOL(sock_setsockopt);
1552
1553static const struct cred *sk_get_peer_cred(struct sock *sk)
1554{
1555 const struct cred *cred;
1556
1557 spin_lock(&sk->sk_peer_lock);
1558 cred = get_cred(sk->sk_peer_cred);
1559 spin_unlock(&sk->sk_peer_lock);
1560
1561 return cred;
1562}
1563
1564static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1565 struct ucred *ucred)
1566{
1567 ucred->pid = pid_vnr(pid);
1568 ucred->uid = ucred->gid = -1;
1569 if (cred) {
1570 struct user_namespace *current_ns = current_user_ns();
1571
1572 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1573 ucred->gid = from_kgid_munged(current_ns, cred->egid);
1574 }
1575}
1576
1577static int groups_to_user(sockptr_t dst, const struct group_info *src)
1578{
1579 struct user_namespace *user_ns = current_user_ns();
1580 int i;
1581
1582 for (i = 0; i < src->ngroups; i++) {
1583 gid_t gid = from_kgid_munged(user_ns, src->gid[i]);
1584
1585 if (copy_to_sockptr_offset(dst, i * sizeof(gid), &gid, sizeof(gid)))
1586 return -EFAULT;
1587 }
1588
1589 return 0;
1590}
1591
1592int sk_getsockopt(struct sock *sk, int level, int optname,
1593 sockptr_t optval, sockptr_t optlen)
1594{
1595 struct socket *sock = sk->sk_socket;
1596
1597 union {
1598 int val;
1599 u64 val64;
1600 unsigned long ulval;
1601 struct linger ling;
1602 struct old_timeval32 tm32;
1603 struct __kernel_old_timeval tm;
1604 struct __kernel_sock_timeval stm;
1605 struct sock_txtime txtime;
1606 struct so_timestamping timestamping;
1607 } v;
1608
1609 int lv = sizeof(int);
1610 int len;
1611
1612 if (copy_from_sockptr(&len, optlen, sizeof(int)))
1613 return -EFAULT;
1614 if (len < 0)
1615 return -EINVAL;
1616
1617 memset(&v, 0, sizeof(v));
1618
1619 switch (optname) {
1620 case SO_DEBUG:
1621 v.val = sock_flag(sk, SOCK_DBG);
1622 break;
1623
1624 case SO_DONTROUTE:
1625 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1626 break;
1627
1628 case SO_BROADCAST:
1629 v.val = sock_flag(sk, SOCK_BROADCAST);
1630 break;
1631
1632 case SO_SNDBUF:
1633 v.val = READ_ONCE(sk->sk_sndbuf);
1634 break;
1635
1636 case SO_RCVBUF:
1637 v.val = READ_ONCE(sk->sk_rcvbuf);
1638 break;
1639
1640 case SO_REUSEADDR:
1641 v.val = sk->sk_reuse;
1642 break;
1643
1644 case SO_REUSEPORT:
1645 v.val = sk->sk_reuseport;
1646 break;
1647
1648 case SO_KEEPALIVE:
1649 v.val = sock_flag(sk, SOCK_KEEPOPEN);
1650 break;
1651
1652 case SO_TYPE:
1653 v.val = sk->sk_type;
1654 break;
1655
1656 case SO_PROTOCOL:
1657 v.val = sk->sk_protocol;
1658 break;
1659
1660 case SO_DOMAIN:
1661 v.val = sk->sk_family;
1662 break;
1663
1664 case SO_ERROR:
1665 v.val = -sock_error(sk);
1666 if (v.val == 0)
1667 v.val = xchg(&sk->sk_err_soft, 0);
1668 break;
1669
1670 case SO_OOBINLINE:
1671 v.val = sock_flag(sk, SOCK_URGINLINE);
1672 break;
1673
1674 case SO_NO_CHECK:
1675 v.val = sk->sk_no_check_tx;
1676 break;
1677
1678 case SO_PRIORITY:
1679 v.val = READ_ONCE(sk->sk_priority);
1680 break;
1681
1682 case SO_LINGER:
1683 lv = sizeof(v.ling);
1684 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
1685 v.ling.l_linger = READ_ONCE(sk->sk_lingertime) / HZ;
1686 break;
1687
1688 case SO_BSDCOMPAT:
1689 break;
1690
1691 case SO_TIMESTAMP_OLD:
1692 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1693 !sock_flag(sk, SOCK_TSTAMP_NEW) &&
1694 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1695 break;
1696
1697 case SO_TIMESTAMPNS_OLD:
1698 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && !sock_flag(sk, SOCK_TSTAMP_NEW);
1699 break;
1700
1701 case SO_TIMESTAMP_NEW:
1702 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && sock_flag(sk, SOCK_TSTAMP_NEW);
1703 break;
1704
1705 case SO_TIMESTAMPNS_NEW:
1706 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && sock_flag(sk, SOCK_TSTAMP_NEW);
1707 break;
1708
1709 case SO_TIMESTAMPING_OLD:
1710 case SO_TIMESTAMPING_NEW:
1711 lv = sizeof(v.timestamping);
1712 /* For the later-added case SO_TIMESTAMPING_NEW: Be strict about only
1713 * returning the flags when they were set through the same option.
1714 * Don't change the beviour for the old case SO_TIMESTAMPING_OLD.
1715 */
1716 if (optname == SO_TIMESTAMPING_OLD || sock_flag(sk, SOCK_TSTAMP_NEW)) {
1717 v.timestamping.flags = READ_ONCE(sk->sk_tsflags);
1718 v.timestamping.bind_phc = READ_ONCE(sk->sk_bind_phc);
1719 }
1720 break;
1721
1722 case SO_RCVTIMEO_OLD:
1723 case SO_RCVTIMEO_NEW:
1724 lv = sock_get_timeout(READ_ONCE(sk->sk_rcvtimeo), &v,
1725 SO_RCVTIMEO_OLD == optname);
1726 break;
1727
1728 case SO_SNDTIMEO_OLD:
1729 case SO_SNDTIMEO_NEW:
1730 lv = sock_get_timeout(READ_ONCE(sk->sk_sndtimeo), &v,
1731 SO_SNDTIMEO_OLD == optname);
1732 break;
1733
1734 case SO_RCVLOWAT:
1735 v.val = READ_ONCE(sk->sk_rcvlowat);
1736 break;
1737
1738 case SO_SNDLOWAT:
1739 v.val = 1;
1740 break;
1741
1742 case SO_PASSCRED:
1743 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1744 break;
1745
1746 case SO_PASSPIDFD:
1747 v.val = !!test_bit(SOCK_PASSPIDFD, &sock->flags);
1748 break;
1749
1750 case SO_PEERCRED:
1751 {
1752 struct ucred peercred;
1753 if (len > sizeof(peercred))
1754 len = sizeof(peercred);
1755
1756 spin_lock(&sk->sk_peer_lock);
1757 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1758 spin_unlock(&sk->sk_peer_lock);
1759
1760 if (copy_to_sockptr(optval, &peercred, len))
1761 return -EFAULT;
1762 goto lenout;
1763 }
1764
1765 case SO_PEERPIDFD:
1766 {
1767 struct pid *peer_pid;
1768 struct file *pidfd_file = NULL;
1769 int pidfd;
1770
1771 if (len > sizeof(pidfd))
1772 len = sizeof(pidfd);
1773
1774 spin_lock(&sk->sk_peer_lock);
1775 peer_pid = get_pid(sk->sk_peer_pid);
1776 spin_unlock(&sk->sk_peer_lock);
1777
1778 if (!peer_pid)
1779 return -ENODATA;
1780
1781 pidfd = pidfd_prepare(peer_pid, 0, &pidfd_file);
1782 put_pid(peer_pid);
1783 if (pidfd < 0)
1784 return pidfd;
1785
1786 if (copy_to_sockptr(optval, &pidfd, len) ||
1787 copy_to_sockptr(optlen, &len, sizeof(int))) {
1788 put_unused_fd(pidfd);
1789 fput(pidfd_file);
1790
1791 return -EFAULT;
1792 }
1793
1794 fd_install(pidfd, pidfd_file);
1795 return 0;
1796 }
1797
1798 case SO_PEERGROUPS:
1799 {
1800 const struct cred *cred;
1801 int ret, n;
1802
1803 cred = sk_get_peer_cred(sk);
1804 if (!cred)
1805 return -ENODATA;
1806
1807 n = cred->group_info->ngroups;
1808 if (len < n * sizeof(gid_t)) {
1809 len = n * sizeof(gid_t);
1810 put_cred(cred);
1811 return copy_to_sockptr(optlen, &len, sizeof(int)) ? -EFAULT : -ERANGE;
1812 }
1813 len = n * sizeof(gid_t);
1814
1815 ret = groups_to_user(optval, cred->group_info);
1816 put_cred(cred);
1817 if (ret)
1818 return ret;
1819 goto lenout;
1820 }
1821
1822 case SO_PEERNAME:
1823 {
1824 struct sockaddr_storage address;
1825
1826 lv = READ_ONCE(sock->ops)->getname(sock, (struct sockaddr *)&address, 2);
1827 if (lv < 0)
1828 return -ENOTCONN;
1829 if (lv < len)
1830 return -EINVAL;
1831 if (copy_to_sockptr(optval, &address, len))
1832 return -EFAULT;
1833 goto lenout;
1834 }
1835
1836 /* Dubious BSD thing... Probably nobody even uses it, but
1837 * the UNIX standard wants it for whatever reason... -DaveM
1838 */
1839 case SO_ACCEPTCONN:
1840 v.val = sk->sk_state == TCP_LISTEN;
1841 break;
1842
1843 case SO_PASSSEC:
1844 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1845 break;
1846
1847 case SO_PEERSEC:
1848 return security_socket_getpeersec_stream(sock,
1849 optval, optlen, len);
1850
1851 case SO_MARK:
1852 v.val = READ_ONCE(sk->sk_mark);
1853 break;
1854
1855 case SO_RCVMARK:
1856 v.val = sock_flag(sk, SOCK_RCVMARK);
1857 break;
1858
1859 case SO_RXQ_OVFL:
1860 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1861 break;
1862
1863 case SO_WIFI_STATUS:
1864 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1865 break;
1866
1867 case SO_PEEK_OFF:
1868 if (!READ_ONCE(sock->ops)->set_peek_off)
1869 return -EOPNOTSUPP;
1870
1871 v.val = READ_ONCE(sk->sk_peek_off);
1872 break;
1873 case SO_NOFCS:
1874 v.val = sock_flag(sk, SOCK_NOFCS);
1875 break;
1876
1877 case SO_BINDTODEVICE:
1878 return sock_getbindtodevice(sk, optval, optlen, len);
1879
1880 case SO_GET_FILTER:
1881 len = sk_get_filter(sk, optval, len);
1882 if (len < 0)
1883 return len;
1884
1885 goto lenout;
1886
1887 case SO_LOCK_FILTER:
1888 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1889 break;
1890
1891 case SO_BPF_EXTENSIONS:
1892 v.val = bpf_tell_extensions();
1893 break;
1894
1895 case SO_SELECT_ERR_QUEUE:
1896 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1897 break;
1898
1899#ifdef CONFIG_NET_RX_BUSY_POLL
1900 case SO_BUSY_POLL:
1901 v.val = READ_ONCE(sk->sk_ll_usec);
1902 break;
1903 case SO_PREFER_BUSY_POLL:
1904 v.val = READ_ONCE(sk->sk_prefer_busy_poll);
1905 break;
1906#endif
1907
1908 case SO_MAX_PACING_RATE:
1909 /* The READ_ONCE() pair with the WRITE_ONCE() in sk_setsockopt() */
1910 if (sizeof(v.ulval) != sizeof(v.val) && len >= sizeof(v.ulval)) {
1911 lv = sizeof(v.ulval);
1912 v.ulval = READ_ONCE(sk->sk_max_pacing_rate);
1913 } else {
1914 /* 32bit version */
1915 v.val = min_t(unsigned long, ~0U,
1916 READ_ONCE(sk->sk_max_pacing_rate));
1917 }
1918 break;
1919
1920 case SO_INCOMING_CPU:
1921 v.val = READ_ONCE(sk->sk_incoming_cpu);
1922 break;
1923
1924 case SO_MEMINFO:
1925 {
1926 u32 meminfo[SK_MEMINFO_VARS];
1927
1928 sk_get_meminfo(sk, meminfo);
1929
1930 len = min_t(unsigned int, len, sizeof(meminfo));
1931 if (copy_to_sockptr(optval, &meminfo, len))
1932 return -EFAULT;
1933
1934 goto lenout;
1935 }
1936
1937#ifdef CONFIG_NET_RX_BUSY_POLL
1938 case SO_INCOMING_NAPI_ID:
1939 v.val = READ_ONCE(sk->sk_napi_id);
1940
1941 /* aggregate non-NAPI IDs down to 0 */
1942 if (v.val < MIN_NAPI_ID)
1943 v.val = 0;
1944
1945 break;
1946#endif
1947
1948 case SO_COOKIE:
1949 lv = sizeof(u64);
1950 if (len < lv)
1951 return -EINVAL;
1952 v.val64 = sock_gen_cookie(sk);
1953 break;
1954
1955 case SO_ZEROCOPY:
1956 v.val = sock_flag(sk, SOCK_ZEROCOPY);
1957 break;
1958
1959 case SO_TXTIME:
1960 lv = sizeof(v.txtime);
1961 v.txtime.clockid = sk->sk_clockid;
1962 v.txtime.flags |= sk->sk_txtime_deadline_mode ?
1963 SOF_TXTIME_DEADLINE_MODE : 0;
1964 v.txtime.flags |= sk->sk_txtime_report_errors ?
1965 SOF_TXTIME_REPORT_ERRORS : 0;
1966 break;
1967
1968 case SO_BINDTOIFINDEX:
1969 v.val = READ_ONCE(sk->sk_bound_dev_if);
1970 break;
1971
1972 case SO_NETNS_COOKIE:
1973 lv = sizeof(u64);
1974 if (len != lv)
1975 return -EINVAL;
1976 v.val64 = sock_net(sk)->net_cookie;
1977 break;
1978
1979 case SO_BUF_LOCK:
1980 v.val = sk->sk_userlocks & SOCK_BUF_LOCK_MASK;
1981 break;
1982
1983 case SO_RESERVE_MEM:
1984 v.val = READ_ONCE(sk->sk_reserved_mem);
1985 break;
1986
1987 case SO_TXREHASH:
1988 /* Paired with WRITE_ONCE() in sk_setsockopt() */
1989 v.val = READ_ONCE(sk->sk_txrehash);
1990 break;
1991
1992 default:
1993 /* We implement the SO_SNDLOWAT etc to not be settable
1994 * (1003.1g 7).
1995 */
1996 return -ENOPROTOOPT;
1997 }
1998
1999 if (len > lv)
2000 len = lv;
2001 if (copy_to_sockptr(optval, &v, len))
2002 return -EFAULT;
2003lenout:
2004 if (copy_to_sockptr(optlen, &len, sizeof(int)))
2005 return -EFAULT;
2006 return 0;
2007}
2008
2009/*
2010 * Initialize an sk_lock.
2011 *
2012 * (We also register the sk_lock with the lock validator.)
2013 */
2014static inline void sock_lock_init(struct sock *sk)
2015{
2016 if (sk->sk_kern_sock)
2017 sock_lock_init_class_and_name(
2018 sk,
2019 af_family_kern_slock_key_strings[sk->sk_family],
2020 af_family_kern_slock_keys + sk->sk_family,
2021 af_family_kern_key_strings[sk->sk_family],
2022 af_family_kern_keys + sk->sk_family);
2023 else
2024 sock_lock_init_class_and_name(
2025 sk,
2026 af_family_slock_key_strings[sk->sk_family],
2027 af_family_slock_keys + sk->sk_family,
2028 af_family_key_strings[sk->sk_family],
2029 af_family_keys + sk->sk_family);
2030}
2031
2032/*
2033 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
2034 * even temporarly, because of RCU lookups. sk_node should also be left as is.
2035 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
2036 */
2037static void sock_copy(struct sock *nsk, const struct sock *osk)
2038{
2039 const struct proto *prot = READ_ONCE(osk->sk_prot);
2040#ifdef CONFIG_SECURITY_NETWORK
2041 void *sptr = nsk->sk_security;
2042#endif
2043
2044 /* If we move sk_tx_queue_mapping out of the private section,
2045 * we must check if sk_tx_queue_clear() is called after
2046 * sock_copy() in sk_clone_lock().
2047 */
2048 BUILD_BUG_ON(offsetof(struct sock, sk_tx_queue_mapping) <
2049 offsetof(struct sock, sk_dontcopy_begin) ||
2050 offsetof(struct sock, sk_tx_queue_mapping) >=
2051 offsetof(struct sock, sk_dontcopy_end));
2052
2053 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
2054
2055 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
2056 prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
2057
2058#ifdef CONFIG_SECURITY_NETWORK
2059 nsk->sk_security = sptr;
2060 security_sk_clone(osk, nsk);
2061#endif
2062}
2063
2064static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
2065 int family)
2066{
2067 struct sock *sk;
2068 struct kmem_cache *slab;
2069
2070 slab = prot->slab;
2071 if (slab != NULL) {
2072 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
2073 if (!sk)
2074 return sk;
2075 if (want_init_on_alloc(priority))
2076 sk_prot_clear_nulls(sk, prot->obj_size);
2077 } else
2078 sk = kmalloc(prot->obj_size, priority);
2079
2080 if (sk != NULL) {
2081 if (security_sk_alloc(sk, family, priority))
2082 goto out_free;
2083
2084 if (!try_module_get(prot->owner))
2085 goto out_free_sec;
2086 }
2087
2088 return sk;
2089
2090out_free_sec:
2091 security_sk_free(sk);
2092out_free:
2093 if (slab != NULL)
2094 kmem_cache_free(slab, sk);
2095 else
2096 kfree(sk);
2097 return NULL;
2098}
2099
2100static void sk_prot_free(struct proto *prot, struct sock *sk)
2101{
2102 struct kmem_cache *slab;
2103 struct module *owner;
2104
2105 owner = prot->owner;
2106 slab = prot->slab;
2107
2108 cgroup_sk_free(&sk->sk_cgrp_data);
2109 mem_cgroup_sk_free(sk);
2110 security_sk_free(sk);
2111 if (slab != NULL)
2112 kmem_cache_free(slab, sk);
2113 else
2114 kfree(sk);
2115 module_put(owner);
2116}
2117
2118/**
2119 * sk_alloc - All socket objects are allocated here
2120 * @net: the applicable net namespace
2121 * @family: protocol family
2122 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
2123 * @prot: struct proto associated with this new sock instance
2124 * @kern: is this to be a kernel socket?
2125 */
2126struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
2127 struct proto *prot, int kern)
2128{
2129 struct sock *sk;
2130
2131 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
2132 if (sk) {
2133 sk->sk_family = family;
2134 /*
2135 * See comment in struct sock definition to understand
2136 * why we need sk_prot_creator -acme
2137 */
2138 sk->sk_prot = sk->sk_prot_creator = prot;
2139 sk->sk_kern_sock = kern;
2140 sock_lock_init(sk);
2141 sk->sk_net_refcnt = kern ? 0 : 1;
2142 if (likely(sk->sk_net_refcnt)) {
2143 get_net_track(net, &sk->ns_tracker, priority);
2144 sock_inuse_add(net, 1);
2145 } else {
2146 __netns_tracker_alloc(net, &sk->ns_tracker,
2147 false, priority);
2148 }
2149
2150 sock_net_set(sk, net);
2151 refcount_set(&sk->sk_wmem_alloc, 1);
2152
2153 mem_cgroup_sk_alloc(sk);
2154 cgroup_sk_alloc(&sk->sk_cgrp_data);
2155 sock_update_classid(&sk->sk_cgrp_data);
2156 sock_update_netprioidx(&sk->sk_cgrp_data);
2157 sk_tx_queue_clear(sk);
2158 }
2159
2160 return sk;
2161}
2162EXPORT_SYMBOL(sk_alloc);
2163
2164/* Sockets having SOCK_RCU_FREE will call this function after one RCU
2165 * grace period. This is the case for UDP sockets and TCP listeners.
2166 */
2167static void __sk_destruct(struct rcu_head *head)
2168{
2169 struct sock *sk = container_of(head, struct sock, sk_rcu);
2170 struct sk_filter *filter;
2171
2172 if (sk->sk_destruct)
2173 sk->sk_destruct(sk);
2174
2175 filter = rcu_dereference_check(sk->sk_filter,
2176 refcount_read(&sk->sk_wmem_alloc) == 0);
2177 if (filter) {
2178 sk_filter_uncharge(sk, filter);
2179 RCU_INIT_POINTER(sk->sk_filter, NULL);
2180 }
2181
2182 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
2183
2184#ifdef CONFIG_BPF_SYSCALL
2185 bpf_sk_storage_free(sk);
2186#endif
2187
2188 if (atomic_read(&sk->sk_omem_alloc))
2189 pr_debug("%s: optmem leakage (%d bytes) detected\n",
2190 __func__, atomic_read(&sk->sk_omem_alloc));
2191
2192 if (sk->sk_frag.page) {
2193 put_page(sk->sk_frag.page);
2194 sk->sk_frag.page = NULL;
2195 }
2196
2197 /* We do not need to acquire sk->sk_peer_lock, we are the last user. */
2198 put_cred(sk->sk_peer_cred);
2199 put_pid(sk->sk_peer_pid);
2200
2201 if (likely(sk->sk_net_refcnt))
2202 put_net_track(sock_net(sk), &sk->ns_tracker);
2203 else
2204 __netns_tracker_free(sock_net(sk), &sk->ns_tracker, false);
2205
2206 sk_prot_free(sk->sk_prot_creator, sk);
2207}
2208
2209void sk_destruct(struct sock *sk)
2210{
2211 bool use_call_rcu = sock_flag(sk, SOCK_RCU_FREE);
2212
2213 if (rcu_access_pointer(sk->sk_reuseport_cb)) {
2214 reuseport_detach_sock(sk);
2215 use_call_rcu = true;
2216 }
2217
2218 if (use_call_rcu)
2219 call_rcu(&sk->sk_rcu, __sk_destruct);
2220 else
2221 __sk_destruct(&sk->sk_rcu);
2222}
2223
2224static void __sk_free(struct sock *sk)
2225{
2226 if (likely(sk->sk_net_refcnt))
2227 sock_inuse_add(sock_net(sk), -1);
2228
2229 if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk)))
2230 sock_diag_broadcast_destroy(sk);
2231 else
2232 sk_destruct(sk);
2233}
2234
2235void sk_free(struct sock *sk)
2236{
2237 /*
2238 * We subtract one from sk_wmem_alloc and can know if
2239 * some packets are still in some tx queue.
2240 * If not null, sock_wfree() will call __sk_free(sk) later
2241 */
2242 if (refcount_dec_and_test(&sk->sk_wmem_alloc))
2243 __sk_free(sk);
2244}
2245EXPORT_SYMBOL(sk_free);
2246
2247static void sk_init_common(struct sock *sk)
2248{
2249 skb_queue_head_init(&sk->sk_receive_queue);
2250 skb_queue_head_init(&sk->sk_write_queue);
2251 skb_queue_head_init(&sk->sk_error_queue);
2252
2253 rwlock_init(&sk->sk_callback_lock);
2254 lockdep_set_class_and_name(&sk->sk_receive_queue.lock,
2255 af_rlock_keys + sk->sk_family,
2256 af_family_rlock_key_strings[sk->sk_family]);
2257 lockdep_set_class_and_name(&sk->sk_write_queue.lock,
2258 af_wlock_keys + sk->sk_family,
2259 af_family_wlock_key_strings[sk->sk_family]);
2260 lockdep_set_class_and_name(&sk->sk_error_queue.lock,
2261 af_elock_keys + sk->sk_family,
2262 af_family_elock_key_strings[sk->sk_family]);
2263 lockdep_set_class_and_name(&sk->sk_callback_lock,
2264 af_callback_keys + sk->sk_family,
2265 af_family_clock_key_strings[sk->sk_family]);
2266}
2267
2268/**
2269 * sk_clone_lock - clone a socket, and lock its clone
2270 * @sk: the socket to clone
2271 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
2272 *
2273 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
2274 */
2275struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
2276{
2277 struct proto *prot = READ_ONCE(sk->sk_prot);
2278 struct sk_filter *filter;
2279 bool is_charged = true;
2280 struct sock *newsk;
2281
2282 newsk = sk_prot_alloc(prot, priority, sk->sk_family);
2283 if (!newsk)
2284 goto out;
2285
2286 sock_copy(newsk, sk);
2287
2288 newsk->sk_prot_creator = prot;
2289
2290 /* SANITY */
2291 if (likely(newsk->sk_net_refcnt)) {
2292 get_net_track(sock_net(newsk), &newsk->ns_tracker, priority);
2293 sock_inuse_add(sock_net(newsk), 1);
2294 } else {
2295 /* Kernel sockets are not elevating the struct net refcount.
2296 * Instead, use a tracker to more easily detect if a layer
2297 * is not properly dismantling its kernel sockets at netns
2298 * destroy time.
2299 */
2300 __netns_tracker_alloc(sock_net(newsk), &newsk->ns_tracker,
2301 false, priority);
2302 }
2303 sk_node_init(&newsk->sk_node);
2304 sock_lock_init(newsk);
2305 bh_lock_sock(newsk);
2306 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
2307 newsk->sk_backlog.len = 0;
2308
2309 atomic_set(&newsk->sk_rmem_alloc, 0);
2310
2311 /* sk_wmem_alloc set to one (see sk_free() and sock_wfree()) */
2312 refcount_set(&newsk->sk_wmem_alloc, 1);
2313
2314 atomic_set(&newsk->sk_omem_alloc, 0);
2315 sk_init_common(newsk);
2316
2317 newsk->sk_dst_cache = NULL;
2318 newsk->sk_dst_pending_confirm = 0;
2319 newsk->sk_wmem_queued = 0;
2320 newsk->sk_forward_alloc = 0;
2321 newsk->sk_reserved_mem = 0;
2322 atomic_set(&newsk->sk_drops, 0);
2323 newsk->sk_send_head = NULL;
2324 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
2325 atomic_set(&newsk->sk_zckey, 0);
2326
2327 sock_reset_flag(newsk, SOCK_DONE);
2328
2329 /* sk->sk_memcg will be populated at accept() time */
2330 newsk->sk_memcg = NULL;
2331
2332 cgroup_sk_clone(&newsk->sk_cgrp_data);
2333
2334 rcu_read_lock();
2335 filter = rcu_dereference(sk->sk_filter);
2336 if (filter != NULL)
2337 /* though it's an empty new sock, the charging may fail
2338 * if sysctl_optmem_max was changed between creation of
2339 * original socket and cloning
2340 */
2341 is_charged = sk_filter_charge(newsk, filter);
2342 RCU_INIT_POINTER(newsk->sk_filter, filter);
2343 rcu_read_unlock();
2344
2345 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
2346 /* We need to make sure that we don't uncharge the new
2347 * socket if we couldn't charge it in the first place
2348 * as otherwise we uncharge the parent's filter.
2349 */
2350 if (!is_charged)
2351 RCU_INIT_POINTER(newsk->sk_filter, NULL);
2352 sk_free_unlock_clone(newsk);
2353 newsk = NULL;
2354 goto out;
2355 }
2356 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
2357
2358 if (bpf_sk_storage_clone(sk, newsk)) {
2359 sk_free_unlock_clone(newsk);
2360 newsk = NULL;
2361 goto out;
2362 }
2363
2364 /* Clear sk_user_data if parent had the pointer tagged
2365 * as not suitable for copying when cloning.
2366 */
2367 if (sk_user_data_is_nocopy(newsk))
2368 newsk->sk_user_data = NULL;
2369
2370 newsk->sk_err = 0;
2371 newsk->sk_err_soft = 0;
2372 newsk->sk_priority = 0;
2373 newsk->sk_incoming_cpu = raw_smp_processor_id();
2374
2375 /* Before updating sk_refcnt, we must commit prior changes to memory
2376 * (Documentation/RCU/rculist_nulls.rst for details)
2377 */
2378 smp_wmb();
2379 refcount_set(&newsk->sk_refcnt, 2);
2380
2381 sk_set_socket(newsk, NULL);
2382 sk_tx_queue_clear(newsk);
2383 RCU_INIT_POINTER(newsk->sk_wq, NULL);
2384
2385 if (newsk->sk_prot->sockets_allocated)
2386 sk_sockets_allocated_inc(newsk);
2387
2388 if (sock_needs_netstamp(sk) && newsk->sk_flags & SK_FLAGS_TIMESTAMP)
2389 net_enable_timestamp();
2390out:
2391 return newsk;
2392}
2393EXPORT_SYMBOL_GPL(sk_clone_lock);
2394
2395void sk_free_unlock_clone(struct sock *sk)
2396{
2397 /* It is still raw copy of parent, so invalidate
2398 * destructor and make plain sk_free() */
2399 sk->sk_destruct = NULL;
2400 bh_unlock_sock(sk);
2401 sk_free(sk);
2402}
2403EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
2404
2405static u32 sk_dst_gso_max_size(struct sock *sk, struct dst_entry *dst)
2406{
2407 bool is_ipv6 = false;
2408 u32 max_size;
2409
2410#if IS_ENABLED(CONFIG_IPV6)
2411 is_ipv6 = (sk->sk_family == AF_INET6 &&
2412 !ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr));
2413#endif
2414 /* pairs with the WRITE_ONCE() in netif_set_gso(_ipv4)_max_size() */
2415 max_size = is_ipv6 ? READ_ONCE(dst->dev->gso_max_size) :
2416 READ_ONCE(dst->dev->gso_ipv4_max_size);
2417 if (max_size > GSO_LEGACY_MAX_SIZE && !sk_is_tcp(sk))
2418 max_size = GSO_LEGACY_MAX_SIZE;
2419
2420 return max_size - (MAX_TCP_HEADER + 1);
2421}
2422
2423void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
2424{
2425 u32 max_segs = 1;
2426
2427 sk->sk_route_caps = dst->dev->features;
2428 if (sk_is_tcp(sk))
2429 sk->sk_route_caps |= NETIF_F_GSO;
2430 if (sk->sk_route_caps & NETIF_F_GSO)
2431 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
2432 if (unlikely(sk->sk_gso_disabled))
2433 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
2434 if (sk_can_gso(sk)) {
2435 if (dst->header_len && !xfrm_dst_offload_ok(dst)) {
2436 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
2437 } else {
2438 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
2439 sk->sk_gso_max_size = sk_dst_gso_max_size(sk, dst);
2440 /* pairs with the WRITE_ONCE() in netif_set_gso_max_segs() */
2441 max_segs = max_t(u32, READ_ONCE(dst->dev->gso_max_segs), 1);
2442 }
2443 }
2444 sk->sk_gso_max_segs = max_segs;
2445 sk_dst_set(sk, dst);
2446}
2447EXPORT_SYMBOL_GPL(sk_setup_caps);
2448
2449/*
2450 * Simple resource managers for sockets.
2451 */
2452
2453
2454/*
2455 * Write buffer destructor automatically called from kfree_skb.
2456 */
2457void sock_wfree(struct sk_buff *skb)
2458{
2459 struct sock *sk = skb->sk;
2460 unsigned int len = skb->truesize;
2461 bool free;
2462
2463 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
2464 if (sock_flag(sk, SOCK_RCU_FREE) &&
2465 sk->sk_write_space == sock_def_write_space) {
2466 rcu_read_lock();
2467 free = refcount_sub_and_test(len, &sk->sk_wmem_alloc);
2468 sock_def_write_space_wfree(sk);
2469 rcu_read_unlock();
2470 if (unlikely(free))
2471 __sk_free(sk);
2472 return;
2473 }
2474
2475 /*
2476 * Keep a reference on sk_wmem_alloc, this will be released
2477 * after sk_write_space() call
2478 */
2479 WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc));
2480 sk->sk_write_space(sk);
2481 len = 1;
2482 }
2483 /*
2484 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
2485 * could not do because of in-flight packets
2486 */
2487 if (refcount_sub_and_test(len, &sk->sk_wmem_alloc))
2488 __sk_free(sk);
2489}
2490EXPORT_SYMBOL(sock_wfree);
2491
2492/* This variant of sock_wfree() is used by TCP,
2493 * since it sets SOCK_USE_WRITE_QUEUE.
2494 */
2495void __sock_wfree(struct sk_buff *skb)
2496{
2497 struct sock *sk = skb->sk;
2498
2499 if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
2500 __sk_free(sk);
2501}
2502
2503void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
2504{
2505 skb_orphan(skb);
2506 skb->sk = sk;
2507#ifdef CONFIG_INET
2508 if (unlikely(!sk_fullsock(sk))) {
2509 skb->destructor = sock_edemux;
2510 sock_hold(sk);
2511 return;
2512 }
2513#endif
2514 skb->destructor = sock_wfree;
2515 skb_set_hash_from_sk(skb, sk);
2516 /*
2517 * We used to take a refcount on sk, but following operation
2518 * is enough to guarantee sk_free() wont free this sock until
2519 * all in-flight packets are completed
2520 */
2521 refcount_add(skb->truesize, &sk->sk_wmem_alloc);
2522}
2523EXPORT_SYMBOL(skb_set_owner_w);
2524
2525static bool can_skb_orphan_partial(const struct sk_buff *skb)
2526{
2527#ifdef CONFIG_TLS_DEVICE
2528 /* Drivers depend on in-order delivery for crypto offload,
2529 * partial orphan breaks out-of-order-OK logic.
2530 */
2531 if (skb->decrypted)
2532 return false;
2533#endif
2534 return (skb->destructor == sock_wfree ||
2535 (IS_ENABLED(CONFIG_INET) && skb->destructor == tcp_wfree));
2536}
2537
2538/* This helper is used by netem, as it can hold packets in its
2539 * delay queue. We want to allow the owner socket to send more
2540 * packets, as if they were already TX completed by a typical driver.
2541 * But we also want to keep skb->sk set because some packet schedulers
2542 * rely on it (sch_fq for example).
2543 */
2544void skb_orphan_partial(struct sk_buff *skb)
2545{
2546 if (skb_is_tcp_pure_ack(skb))
2547 return;
2548
2549 if (can_skb_orphan_partial(skb) && skb_set_owner_sk_safe(skb, skb->sk))
2550 return;
2551
2552 skb_orphan(skb);
2553}
2554EXPORT_SYMBOL(skb_orphan_partial);
2555
2556/*
2557 * Read buffer destructor automatically called from kfree_skb.
2558 */
2559void sock_rfree(struct sk_buff *skb)
2560{
2561 struct sock *sk = skb->sk;
2562 unsigned int len = skb->truesize;
2563
2564 atomic_sub(len, &sk->sk_rmem_alloc);
2565 sk_mem_uncharge(sk, len);
2566}
2567EXPORT_SYMBOL(sock_rfree);
2568
2569/*
2570 * Buffer destructor for skbs that are not used directly in read or write
2571 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
2572 */
2573void sock_efree(struct sk_buff *skb)
2574{
2575 sock_put(skb->sk);
2576}
2577EXPORT_SYMBOL(sock_efree);
2578
2579/* Buffer destructor for prefetch/receive path where reference count may
2580 * not be held, e.g. for listen sockets.
2581 */
2582#ifdef CONFIG_INET
2583void sock_pfree(struct sk_buff *skb)
2584{
2585 if (sk_is_refcounted(skb->sk))
2586 sock_gen_put(skb->sk);
2587}
2588EXPORT_SYMBOL(sock_pfree);
2589#endif /* CONFIG_INET */
2590
2591kuid_t sock_i_uid(struct sock *sk)
2592{
2593 kuid_t uid;
2594
2595 read_lock_bh(&sk->sk_callback_lock);
2596 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
2597 read_unlock_bh(&sk->sk_callback_lock);
2598 return uid;
2599}
2600EXPORT_SYMBOL(sock_i_uid);
2601
2602unsigned long __sock_i_ino(struct sock *sk)
2603{
2604 unsigned long ino;
2605
2606 read_lock(&sk->sk_callback_lock);
2607 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
2608 read_unlock(&sk->sk_callback_lock);
2609 return ino;
2610}
2611EXPORT_SYMBOL(__sock_i_ino);
2612
2613unsigned long sock_i_ino(struct sock *sk)
2614{
2615 unsigned long ino;
2616
2617 local_bh_disable();
2618 ino = __sock_i_ino(sk);
2619 local_bh_enable();
2620 return ino;
2621}
2622EXPORT_SYMBOL(sock_i_ino);
2623
2624/*
2625 * Allocate a skb from the socket's send buffer.
2626 */
2627struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
2628 gfp_t priority)
2629{
2630 if (force ||
2631 refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf)) {
2632 struct sk_buff *skb = alloc_skb(size, priority);
2633
2634 if (skb) {
2635 skb_set_owner_w(skb, sk);
2636 return skb;
2637 }
2638 }
2639 return NULL;
2640}
2641EXPORT_SYMBOL(sock_wmalloc);
2642
2643static void sock_ofree(struct sk_buff *skb)
2644{
2645 struct sock *sk = skb->sk;
2646
2647 atomic_sub(skb->truesize, &sk->sk_omem_alloc);
2648}
2649
2650struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size,
2651 gfp_t priority)
2652{
2653 struct sk_buff *skb;
2654
2655 /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */
2656 if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) >
2657 READ_ONCE(sock_net(sk)->core.sysctl_optmem_max))
2658 return NULL;
2659
2660 skb = alloc_skb(size, priority);
2661 if (!skb)
2662 return NULL;
2663
2664 atomic_add(skb->truesize, &sk->sk_omem_alloc);
2665 skb->sk = sk;
2666 skb->destructor = sock_ofree;
2667 return skb;
2668}
2669
2670/*
2671 * Allocate a memory block from the socket's option memory buffer.
2672 */
2673void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
2674{
2675 int optmem_max = READ_ONCE(sock_net(sk)->core.sysctl_optmem_max);
2676
2677 if ((unsigned int)size <= optmem_max &&
2678 atomic_read(&sk->sk_omem_alloc) + size < optmem_max) {
2679 void *mem;
2680 /* First do the add, to avoid the race if kmalloc
2681 * might sleep.
2682 */
2683 atomic_add(size, &sk->sk_omem_alloc);
2684 mem = kmalloc(size, priority);
2685 if (mem)
2686 return mem;
2687 atomic_sub(size, &sk->sk_omem_alloc);
2688 }
2689 return NULL;
2690}
2691EXPORT_SYMBOL(sock_kmalloc);
2692
2693/* Free an option memory block. Note, we actually want the inline
2694 * here as this allows gcc to detect the nullify and fold away the
2695 * condition entirely.
2696 */
2697static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
2698 const bool nullify)
2699{
2700 if (WARN_ON_ONCE(!mem))
2701 return;
2702 if (nullify)
2703 kfree_sensitive(mem);
2704 else
2705 kfree(mem);
2706 atomic_sub(size, &sk->sk_omem_alloc);
2707}
2708
2709void sock_kfree_s(struct sock *sk, void *mem, int size)
2710{
2711 __sock_kfree_s(sk, mem, size, false);
2712}
2713EXPORT_SYMBOL(sock_kfree_s);
2714
2715void sock_kzfree_s(struct sock *sk, void *mem, int size)
2716{
2717 __sock_kfree_s(sk, mem, size, true);
2718}
2719EXPORT_SYMBOL(sock_kzfree_s);
2720
2721/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
2722 I think, these locks should be removed for datagram sockets.
2723 */
2724static long sock_wait_for_wmem(struct sock *sk, long timeo)
2725{
2726 DEFINE_WAIT(wait);
2727
2728 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2729 for (;;) {
2730 if (!timeo)
2731 break;
2732 if (signal_pending(current))
2733 break;
2734 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2735 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2736 if (refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf))
2737 break;
2738 if (READ_ONCE(sk->sk_shutdown) & SEND_SHUTDOWN)
2739 break;
2740 if (READ_ONCE(sk->sk_err))
2741 break;
2742 timeo = schedule_timeout(timeo);
2743 }
2744 finish_wait(sk_sleep(sk), &wait);
2745 return timeo;
2746}
2747
2748
2749/*
2750 * Generic send/receive buffer handlers
2751 */
2752
2753struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
2754 unsigned long data_len, int noblock,
2755 int *errcode, int max_page_order)
2756{
2757 struct sk_buff *skb;
2758 long timeo;
2759 int err;
2760
2761 timeo = sock_sndtimeo(sk, noblock);
2762 for (;;) {
2763 err = sock_error(sk);
2764 if (err != 0)
2765 goto failure;
2766
2767 err = -EPIPE;
2768 if (READ_ONCE(sk->sk_shutdown) & SEND_SHUTDOWN)
2769 goto failure;
2770
2771 if (sk_wmem_alloc_get(sk) < READ_ONCE(sk->sk_sndbuf))
2772 break;
2773
2774 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2775 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2776 err = -EAGAIN;
2777 if (!timeo)
2778 goto failure;
2779 if (signal_pending(current))
2780 goto interrupted;
2781 timeo = sock_wait_for_wmem(sk, timeo);
2782 }
2783 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
2784 errcode, sk->sk_allocation);
2785 if (skb)
2786 skb_set_owner_w(skb, sk);
2787 return skb;
2788
2789interrupted:
2790 err = sock_intr_errno(timeo);
2791failure:
2792 *errcode = err;
2793 return NULL;
2794}
2795EXPORT_SYMBOL(sock_alloc_send_pskb);
2796
2797int __sock_cmsg_send(struct sock *sk, struct cmsghdr *cmsg,
2798 struct sockcm_cookie *sockc)
2799{
2800 u32 tsflags;
2801
2802 switch (cmsg->cmsg_type) {
2803 case SO_MARK:
2804 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
2805 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2806 return -EPERM;
2807 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2808 return -EINVAL;
2809 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
2810 break;
2811 case SO_TIMESTAMPING_OLD:
2812 case SO_TIMESTAMPING_NEW:
2813 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2814 return -EINVAL;
2815
2816 tsflags = *(u32 *)CMSG_DATA(cmsg);
2817 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
2818 return -EINVAL;
2819
2820 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
2821 sockc->tsflags |= tsflags;
2822 break;
2823 case SCM_TXTIME:
2824 if (!sock_flag(sk, SOCK_TXTIME))
2825 return -EINVAL;
2826 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u64)))
2827 return -EINVAL;
2828 sockc->transmit_time = get_unaligned((u64 *)CMSG_DATA(cmsg));
2829 break;
2830 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
2831 case SCM_RIGHTS:
2832 case SCM_CREDENTIALS:
2833 break;
2834 default:
2835 return -EINVAL;
2836 }
2837 return 0;
2838}
2839EXPORT_SYMBOL(__sock_cmsg_send);
2840
2841int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
2842 struct sockcm_cookie *sockc)
2843{
2844 struct cmsghdr *cmsg;
2845 int ret;
2846
2847 for_each_cmsghdr(cmsg, msg) {
2848 if (!CMSG_OK(msg, cmsg))
2849 return -EINVAL;
2850 if (cmsg->cmsg_level != SOL_SOCKET)
2851 continue;
2852 ret = __sock_cmsg_send(sk, cmsg, sockc);
2853 if (ret)
2854 return ret;
2855 }
2856 return 0;
2857}
2858EXPORT_SYMBOL(sock_cmsg_send);
2859
2860static void sk_enter_memory_pressure(struct sock *sk)
2861{
2862 if (!sk->sk_prot->enter_memory_pressure)
2863 return;
2864
2865 sk->sk_prot->enter_memory_pressure(sk);
2866}
2867
2868static void sk_leave_memory_pressure(struct sock *sk)
2869{
2870 if (sk->sk_prot->leave_memory_pressure) {
2871 INDIRECT_CALL_INET_1(sk->sk_prot->leave_memory_pressure,
2872 tcp_leave_memory_pressure, sk);
2873 } else {
2874 unsigned long *memory_pressure = sk->sk_prot->memory_pressure;
2875
2876 if (memory_pressure && READ_ONCE(*memory_pressure))
2877 WRITE_ONCE(*memory_pressure, 0);
2878 }
2879}
2880
2881DEFINE_STATIC_KEY_FALSE(net_high_order_alloc_disable_key);
2882
2883/**
2884 * skb_page_frag_refill - check that a page_frag contains enough room
2885 * @sz: minimum size of the fragment we want to get
2886 * @pfrag: pointer to page_frag
2887 * @gfp: priority for memory allocation
2888 *
2889 * Note: While this allocator tries to use high order pages, there is
2890 * no guarantee that allocations succeed. Therefore, @sz MUST be
2891 * less or equal than PAGE_SIZE.
2892 */
2893bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
2894{
2895 if (pfrag->page) {
2896 if (page_ref_count(pfrag->page) == 1) {
2897 pfrag->offset = 0;
2898 return true;
2899 }
2900 if (pfrag->offset + sz <= pfrag->size)
2901 return true;
2902 put_page(pfrag->page);
2903 }
2904
2905 pfrag->offset = 0;
2906 if (SKB_FRAG_PAGE_ORDER &&
2907 !static_branch_unlikely(&net_high_order_alloc_disable_key)) {
2908 /* Avoid direct reclaim but allow kswapd to wake */
2909 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
2910 __GFP_COMP | __GFP_NOWARN |
2911 __GFP_NORETRY,
2912 SKB_FRAG_PAGE_ORDER);
2913 if (likely(pfrag->page)) {
2914 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
2915 return true;
2916 }
2917 }
2918 pfrag->page = alloc_page(gfp);
2919 if (likely(pfrag->page)) {
2920 pfrag->size = PAGE_SIZE;
2921 return true;
2922 }
2923 return false;
2924}
2925EXPORT_SYMBOL(skb_page_frag_refill);
2926
2927bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2928{
2929 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2930 return true;
2931
2932 sk_enter_memory_pressure(sk);
2933 sk_stream_moderate_sndbuf(sk);
2934 return false;
2935}
2936EXPORT_SYMBOL(sk_page_frag_refill);
2937
2938void __lock_sock(struct sock *sk)
2939 __releases(&sk->sk_lock.slock)
2940 __acquires(&sk->sk_lock.slock)
2941{
2942 DEFINE_WAIT(wait);
2943
2944 for (;;) {
2945 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2946 TASK_UNINTERRUPTIBLE);
2947 spin_unlock_bh(&sk->sk_lock.slock);
2948 schedule();
2949 spin_lock_bh(&sk->sk_lock.slock);
2950 if (!sock_owned_by_user(sk))
2951 break;
2952 }
2953 finish_wait(&sk->sk_lock.wq, &wait);
2954}
2955
2956void __release_sock(struct sock *sk)
2957 __releases(&sk->sk_lock.slock)
2958 __acquires(&sk->sk_lock.slock)
2959{
2960 struct sk_buff *skb, *next;
2961
2962 while ((skb = sk->sk_backlog.head) != NULL) {
2963 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
2964
2965 spin_unlock_bh(&sk->sk_lock.slock);
2966
2967 do {
2968 next = skb->next;
2969 prefetch(next);
2970 DEBUG_NET_WARN_ON_ONCE(skb_dst_is_noref(skb));
2971 skb_mark_not_on_list(skb);
2972 sk_backlog_rcv(sk, skb);
2973
2974 cond_resched();
2975
2976 skb = next;
2977 } while (skb != NULL);
2978
2979 spin_lock_bh(&sk->sk_lock.slock);
2980 }
2981
2982 /*
2983 * Doing the zeroing here guarantee we can not loop forever
2984 * while a wild producer attempts to flood us.
2985 */
2986 sk->sk_backlog.len = 0;
2987}
2988
2989void __sk_flush_backlog(struct sock *sk)
2990{
2991 spin_lock_bh(&sk->sk_lock.slock);
2992 __release_sock(sk);
2993
2994 if (sk->sk_prot->release_cb)
2995 INDIRECT_CALL_INET_1(sk->sk_prot->release_cb,
2996 tcp_release_cb, sk);
2997
2998 spin_unlock_bh(&sk->sk_lock.slock);
2999}
3000EXPORT_SYMBOL_GPL(__sk_flush_backlog);
3001
3002/**
3003 * sk_wait_data - wait for data to arrive at sk_receive_queue
3004 * @sk: sock to wait on
3005 * @timeo: for how long
3006 * @skb: last skb seen on sk_receive_queue
3007 *
3008 * Now socket state including sk->sk_err is changed only under lock,
3009 * hence we may omit checks after joining wait queue.
3010 * We check receive queue before schedule() only as optimization;
3011 * it is very likely that release_sock() added new data.
3012 */
3013int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
3014{
3015 DEFINE_WAIT_FUNC(wait, woken_wake_function);
3016 int rc;
3017
3018 add_wait_queue(sk_sleep(sk), &wait);
3019 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
3020 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
3021 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
3022 remove_wait_queue(sk_sleep(sk), &wait);
3023 return rc;
3024}
3025EXPORT_SYMBOL(sk_wait_data);
3026
3027/**
3028 * __sk_mem_raise_allocated - increase memory_allocated
3029 * @sk: socket
3030 * @size: memory size to allocate
3031 * @amt: pages to allocate
3032 * @kind: allocation type
3033 *
3034 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc.
3035 *
3036 * Unlike the globally shared limits among the sockets under same protocol,
3037 * consuming the budget of a memcg won't have direct effect on other ones.
3038 * So be optimistic about memcg's tolerance, and leave the callers to decide
3039 * whether or not to raise allocated through sk_under_memory_pressure() or
3040 * its variants.
3041 */
3042int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
3043{
3044 struct mem_cgroup *memcg = mem_cgroup_sockets_enabled ? sk->sk_memcg : NULL;
3045 struct proto *prot = sk->sk_prot;
3046 bool charged = false;
3047 long allocated;
3048
3049 sk_memory_allocated_add(sk, amt);
3050 allocated = sk_memory_allocated(sk);
3051
3052 if (memcg) {
3053 if (!mem_cgroup_charge_skmem(memcg, amt, gfp_memcg_charge()))
3054 goto suppress_allocation;
3055 charged = true;
3056 }
3057
3058 /* Under limit. */
3059 if (allocated <= sk_prot_mem_limits(sk, 0)) {
3060 sk_leave_memory_pressure(sk);
3061 return 1;
3062 }
3063
3064 /* Under pressure. */
3065 if (allocated > sk_prot_mem_limits(sk, 1))
3066 sk_enter_memory_pressure(sk);
3067
3068 /* Over hard limit. */
3069 if (allocated > sk_prot_mem_limits(sk, 2))
3070 goto suppress_allocation;
3071
3072 /* Guarantee minimum buffer size under pressure (either global
3073 * or memcg) to make sure features described in RFC 7323 (TCP
3074 * Extensions for High Performance) work properly.
3075 *
3076 * This rule does NOT stand when exceeds global or memcg's hard
3077 * limit, or else a DoS attack can be taken place by spawning
3078 * lots of sockets whose usage are under minimum buffer size.
3079 */
3080 if (kind == SK_MEM_RECV) {
3081 if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot))
3082 return 1;
3083
3084 } else { /* SK_MEM_SEND */
3085 int wmem0 = sk_get_wmem0(sk, prot);
3086
3087 if (sk->sk_type == SOCK_STREAM) {
3088 if (sk->sk_wmem_queued < wmem0)
3089 return 1;
3090 } else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) {
3091 return 1;
3092 }
3093 }
3094
3095 if (sk_has_memory_pressure(sk)) {
3096 u64 alloc;
3097
3098 /* The following 'average' heuristic is within the
3099 * scope of global accounting, so it only makes
3100 * sense for global memory pressure.
3101 */
3102 if (!sk_under_global_memory_pressure(sk))
3103 return 1;
3104
3105 /* Try to be fair among all the sockets under global
3106 * pressure by allowing the ones that below average
3107 * usage to raise.
3108 */
3109 alloc = sk_sockets_allocated_read_positive(sk);
3110 if (sk_prot_mem_limits(sk, 2) > alloc *
3111 sk_mem_pages(sk->sk_wmem_queued +
3112 atomic_read(&sk->sk_rmem_alloc) +
3113 sk->sk_forward_alloc))
3114 return 1;
3115 }
3116
3117suppress_allocation:
3118
3119 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
3120 sk_stream_moderate_sndbuf(sk);
3121
3122 /* Fail only if socket is _under_ its sndbuf.
3123 * In this case we cannot block, so that we have to fail.
3124 */
3125 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) {
3126 /* Force charge with __GFP_NOFAIL */
3127 if (memcg && !charged) {
3128 mem_cgroup_charge_skmem(memcg, amt,
3129 gfp_memcg_charge() | __GFP_NOFAIL);
3130 }
3131 return 1;
3132 }
3133 }
3134
3135 if (kind == SK_MEM_SEND || (kind == SK_MEM_RECV && charged))
3136 trace_sock_exceed_buf_limit(sk, prot, allocated, kind);
3137
3138 sk_memory_allocated_sub(sk, amt);
3139
3140 if (charged)
3141 mem_cgroup_uncharge_skmem(memcg, amt);
3142
3143 return 0;
3144}
3145
3146/**
3147 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
3148 * @sk: socket
3149 * @size: memory size to allocate
3150 * @kind: allocation type
3151 *
3152 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
3153 * rmem allocation. This function assumes that protocols which have
3154 * memory_pressure use sk_wmem_queued as write buffer accounting.
3155 */
3156int __sk_mem_schedule(struct sock *sk, int size, int kind)
3157{
3158 int ret, amt = sk_mem_pages(size);
3159
3160 sk_forward_alloc_add(sk, amt << PAGE_SHIFT);
3161 ret = __sk_mem_raise_allocated(sk, size, amt, kind);
3162 if (!ret)
3163 sk_forward_alloc_add(sk, -(amt << PAGE_SHIFT));
3164 return ret;
3165}
3166EXPORT_SYMBOL(__sk_mem_schedule);
3167
3168/**
3169 * __sk_mem_reduce_allocated - reclaim memory_allocated
3170 * @sk: socket
3171 * @amount: number of quanta
3172 *
3173 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
3174 */
3175void __sk_mem_reduce_allocated(struct sock *sk, int amount)
3176{
3177 sk_memory_allocated_sub(sk, amount);
3178
3179 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
3180 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
3181
3182 if (sk_under_global_memory_pressure(sk) &&
3183 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
3184 sk_leave_memory_pressure(sk);
3185}
3186
3187/**
3188 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
3189 * @sk: socket
3190 * @amount: number of bytes (rounded down to a PAGE_SIZE multiple)
3191 */
3192void __sk_mem_reclaim(struct sock *sk, int amount)
3193{
3194 amount >>= PAGE_SHIFT;
3195 sk_forward_alloc_add(sk, -(amount << PAGE_SHIFT));
3196 __sk_mem_reduce_allocated(sk, amount);
3197}
3198EXPORT_SYMBOL(__sk_mem_reclaim);
3199
3200int sk_set_peek_off(struct sock *sk, int val)
3201{
3202 WRITE_ONCE(sk->sk_peek_off, val);
3203 return 0;
3204}
3205EXPORT_SYMBOL_GPL(sk_set_peek_off);
3206
3207/*
3208 * Set of default routines for initialising struct proto_ops when
3209 * the protocol does not support a particular function. In certain
3210 * cases where it makes no sense for a protocol to have a "do nothing"
3211 * function, some default processing is provided.
3212 */
3213
3214int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
3215{
3216 return -EOPNOTSUPP;
3217}
3218EXPORT_SYMBOL(sock_no_bind);
3219
3220int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
3221 int len, int flags)
3222{
3223 return -EOPNOTSUPP;
3224}
3225EXPORT_SYMBOL(sock_no_connect);
3226
3227int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
3228{
3229 return -EOPNOTSUPP;
3230}
3231EXPORT_SYMBOL(sock_no_socketpair);
3232
3233int sock_no_accept(struct socket *sock, struct socket *newsock, int flags,
3234 bool kern)
3235{
3236 return -EOPNOTSUPP;
3237}
3238EXPORT_SYMBOL(sock_no_accept);
3239
3240int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
3241 int peer)
3242{
3243 return -EOPNOTSUPP;
3244}
3245EXPORT_SYMBOL(sock_no_getname);
3246
3247int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
3248{
3249 return -EOPNOTSUPP;
3250}
3251EXPORT_SYMBOL(sock_no_ioctl);
3252
3253int sock_no_listen(struct socket *sock, int backlog)
3254{
3255 return -EOPNOTSUPP;
3256}
3257EXPORT_SYMBOL(sock_no_listen);
3258
3259int sock_no_shutdown(struct socket *sock, int how)
3260{
3261 return -EOPNOTSUPP;
3262}
3263EXPORT_SYMBOL(sock_no_shutdown);
3264
3265int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
3266{
3267 return -EOPNOTSUPP;
3268}
3269EXPORT_SYMBOL(sock_no_sendmsg);
3270
3271int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len)
3272{
3273 return -EOPNOTSUPP;
3274}
3275EXPORT_SYMBOL(sock_no_sendmsg_locked);
3276
3277int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
3278 int flags)
3279{
3280 return -EOPNOTSUPP;
3281}
3282EXPORT_SYMBOL(sock_no_recvmsg);
3283
3284int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
3285{
3286 /* Mirror missing mmap method error code */
3287 return -ENODEV;
3288}
3289EXPORT_SYMBOL(sock_no_mmap);
3290
3291/*
3292 * When a file is received (via SCM_RIGHTS, etc), we must bump the
3293 * various sock-based usage counts.
3294 */
3295void __receive_sock(struct file *file)
3296{
3297 struct socket *sock;
3298
3299 sock = sock_from_file(file);
3300 if (sock) {
3301 sock_update_netprioidx(&sock->sk->sk_cgrp_data);
3302 sock_update_classid(&sock->sk->sk_cgrp_data);
3303 }
3304}
3305
3306/*
3307 * Default Socket Callbacks
3308 */
3309
3310static void sock_def_wakeup(struct sock *sk)
3311{
3312 struct socket_wq *wq;
3313
3314 rcu_read_lock();
3315 wq = rcu_dereference(sk->sk_wq);
3316 if (skwq_has_sleeper(wq))
3317 wake_up_interruptible_all(&wq->wait);
3318 rcu_read_unlock();
3319}
3320
3321static void sock_def_error_report(struct sock *sk)
3322{
3323 struct socket_wq *wq;
3324
3325 rcu_read_lock();
3326 wq = rcu_dereference(sk->sk_wq);
3327 if (skwq_has_sleeper(wq))
3328 wake_up_interruptible_poll(&wq->wait, EPOLLERR);
3329 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
3330 rcu_read_unlock();
3331}
3332
3333void sock_def_readable(struct sock *sk)
3334{
3335 struct socket_wq *wq;
3336
3337 trace_sk_data_ready(sk);
3338
3339 rcu_read_lock();
3340 wq = rcu_dereference(sk->sk_wq);
3341 if (skwq_has_sleeper(wq))
3342 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
3343 EPOLLRDNORM | EPOLLRDBAND);
3344 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
3345 rcu_read_unlock();
3346}
3347
3348static void sock_def_write_space(struct sock *sk)
3349{
3350 struct socket_wq *wq;
3351
3352 rcu_read_lock();
3353
3354 /* Do not wake up a writer until he can make "significant"
3355 * progress. --DaveM
3356 */
3357 if (sock_writeable(sk)) {
3358 wq = rcu_dereference(sk->sk_wq);
3359 if (skwq_has_sleeper(wq))
3360 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
3361 EPOLLWRNORM | EPOLLWRBAND);
3362
3363 /* Should agree with poll, otherwise some programs break */
3364 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
3365 }
3366
3367 rcu_read_unlock();
3368}
3369
3370/* An optimised version of sock_def_write_space(), should only be called
3371 * for SOCK_RCU_FREE sockets under RCU read section and after putting
3372 * ->sk_wmem_alloc.
3373 */
3374static void sock_def_write_space_wfree(struct sock *sk)
3375{
3376 /* Do not wake up a writer until he can make "significant"
3377 * progress. --DaveM
3378 */
3379 if (sock_writeable(sk)) {
3380 struct socket_wq *wq = rcu_dereference(sk->sk_wq);
3381
3382 /* rely on refcount_sub from sock_wfree() */
3383 smp_mb__after_atomic();
3384 if (wq && waitqueue_active(&wq->wait))
3385 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
3386 EPOLLWRNORM | EPOLLWRBAND);
3387
3388 /* Should agree with poll, otherwise some programs break */
3389 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
3390 }
3391}
3392
3393static void sock_def_destruct(struct sock *sk)
3394{
3395}
3396
3397void sk_send_sigurg(struct sock *sk)
3398{
3399 if (sk->sk_socket && sk->sk_socket->file)
3400 if (send_sigurg(&sk->sk_socket->file->f_owner))
3401 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
3402}
3403EXPORT_SYMBOL(sk_send_sigurg);
3404
3405void sk_reset_timer(struct sock *sk, struct timer_list* timer,
3406 unsigned long expires)
3407{
3408 if (!mod_timer(timer, expires))
3409 sock_hold(sk);
3410}
3411EXPORT_SYMBOL(sk_reset_timer);
3412
3413void sk_stop_timer(struct sock *sk, struct timer_list* timer)
3414{
3415 if (del_timer(timer))
3416 __sock_put(sk);
3417}
3418EXPORT_SYMBOL(sk_stop_timer);
3419
3420void sk_stop_timer_sync(struct sock *sk, struct timer_list *timer)
3421{
3422 if (del_timer_sync(timer))
3423 __sock_put(sk);
3424}
3425EXPORT_SYMBOL(sk_stop_timer_sync);
3426
3427void sock_init_data_uid(struct socket *sock, struct sock *sk, kuid_t uid)
3428{
3429 sk_init_common(sk);
3430 sk->sk_send_head = NULL;
3431
3432 timer_setup(&sk->sk_timer, NULL, 0);
3433
3434 sk->sk_allocation = GFP_KERNEL;
3435 sk->sk_rcvbuf = READ_ONCE(sysctl_rmem_default);
3436 sk->sk_sndbuf = READ_ONCE(sysctl_wmem_default);
3437 sk->sk_state = TCP_CLOSE;
3438 sk->sk_use_task_frag = true;
3439 sk_set_socket(sk, sock);
3440
3441 sock_set_flag(sk, SOCK_ZAPPED);
3442
3443 if (sock) {
3444 sk->sk_type = sock->type;
3445 RCU_INIT_POINTER(sk->sk_wq, &sock->wq);
3446 sock->sk = sk;
3447 } else {
3448 RCU_INIT_POINTER(sk->sk_wq, NULL);
3449 }
3450 sk->sk_uid = uid;
3451
3452 rwlock_init(&sk->sk_callback_lock);
3453 if (sk->sk_kern_sock)
3454 lockdep_set_class_and_name(
3455 &sk->sk_callback_lock,
3456 af_kern_callback_keys + sk->sk_family,
3457 af_family_kern_clock_key_strings[sk->sk_family]);
3458 else
3459 lockdep_set_class_and_name(
3460 &sk->sk_callback_lock,
3461 af_callback_keys + sk->sk_family,
3462 af_family_clock_key_strings[sk->sk_family]);
3463
3464 sk->sk_state_change = sock_def_wakeup;
3465 sk->sk_data_ready = sock_def_readable;
3466 sk->sk_write_space = sock_def_write_space;
3467 sk->sk_error_report = sock_def_error_report;
3468 sk->sk_destruct = sock_def_destruct;
3469
3470 sk->sk_frag.page = NULL;
3471 sk->sk_frag.offset = 0;
3472 sk->sk_peek_off = -1;
3473
3474 sk->sk_peer_pid = NULL;
3475 sk->sk_peer_cred = NULL;
3476 spin_lock_init(&sk->sk_peer_lock);
3477
3478 sk->sk_write_pending = 0;
3479 sk->sk_rcvlowat = 1;
3480 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
3481 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
3482
3483 sk->sk_stamp = SK_DEFAULT_STAMP;
3484#if BITS_PER_LONG==32
3485 seqlock_init(&sk->sk_stamp_seq);
3486#endif
3487 atomic_set(&sk->sk_zckey, 0);
3488
3489#ifdef CONFIG_NET_RX_BUSY_POLL
3490 sk->sk_napi_id = 0;
3491 sk->sk_ll_usec = READ_ONCE(sysctl_net_busy_read);
3492#endif
3493
3494 sk->sk_max_pacing_rate = ~0UL;
3495 sk->sk_pacing_rate = ~0UL;
3496 WRITE_ONCE(sk->sk_pacing_shift, 10);
3497 sk->sk_incoming_cpu = -1;
3498
3499 sk_rx_queue_clear(sk);
3500 /*
3501 * Before updating sk_refcnt, we must commit prior changes to memory
3502 * (Documentation/RCU/rculist_nulls.rst for details)
3503 */
3504 smp_wmb();
3505 refcount_set(&sk->sk_refcnt, 1);
3506 atomic_set(&sk->sk_drops, 0);
3507}
3508EXPORT_SYMBOL(sock_init_data_uid);
3509
3510void sock_init_data(struct socket *sock, struct sock *sk)
3511{
3512 kuid_t uid = sock ?
3513 SOCK_INODE(sock)->i_uid :
3514 make_kuid(sock_net(sk)->user_ns, 0);
3515
3516 sock_init_data_uid(sock, sk, uid);
3517}
3518EXPORT_SYMBOL(sock_init_data);
3519
3520void lock_sock_nested(struct sock *sk, int subclass)
3521{
3522 /* The sk_lock has mutex_lock() semantics here. */
3523 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
3524
3525 might_sleep();
3526 spin_lock_bh(&sk->sk_lock.slock);
3527 if (sock_owned_by_user_nocheck(sk))
3528 __lock_sock(sk);
3529 sk->sk_lock.owned = 1;
3530 spin_unlock_bh(&sk->sk_lock.slock);
3531}
3532EXPORT_SYMBOL(lock_sock_nested);
3533
3534void release_sock(struct sock *sk)
3535{
3536 spin_lock_bh(&sk->sk_lock.slock);
3537 if (sk->sk_backlog.tail)
3538 __release_sock(sk);
3539
3540 if (sk->sk_prot->release_cb)
3541 INDIRECT_CALL_INET_1(sk->sk_prot->release_cb,
3542 tcp_release_cb, sk);
3543
3544 sock_release_ownership(sk);
3545 if (waitqueue_active(&sk->sk_lock.wq))
3546 wake_up(&sk->sk_lock.wq);
3547 spin_unlock_bh(&sk->sk_lock.slock);
3548}
3549EXPORT_SYMBOL(release_sock);
3550
3551bool __lock_sock_fast(struct sock *sk) __acquires(&sk->sk_lock.slock)
3552{
3553 might_sleep();
3554 spin_lock_bh(&sk->sk_lock.slock);
3555
3556 if (!sock_owned_by_user_nocheck(sk)) {
3557 /*
3558 * Fast path return with bottom halves disabled and
3559 * sock::sk_lock.slock held.
3560 *
3561 * The 'mutex' is not contended and holding
3562 * sock::sk_lock.slock prevents all other lockers to
3563 * proceed so the corresponding unlock_sock_fast() can
3564 * avoid the slow path of release_sock() completely and
3565 * just release slock.
3566 *
3567 * From a semantical POV this is equivalent to 'acquiring'
3568 * the 'mutex', hence the corresponding lockdep
3569 * mutex_release() has to happen in the fast path of
3570 * unlock_sock_fast().
3571 */
3572 return false;
3573 }
3574
3575 __lock_sock(sk);
3576 sk->sk_lock.owned = 1;
3577 __acquire(&sk->sk_lock.slock);
3578 spin_unlock_bh(&sk->sk_lock.slock);
3579 return true;
3580}
3581EXPORT_SYMBOL(__lock_sock_fast);
3582
3583int sock_gettstamp(struct socket *sock, void __user *userstamp,
3584 bool timeval, bool time32)
3585{
3586 struct sock *sk = sock->sk;
3587 struct timespec64 ts;
3588
3589 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
3590 ts = ktime_to_timespec64(sock_read_timestamp(sk));
3591 if (ts.tv_sec == -1)
3592 return -ENOENT;
3593 if (ts.tv_sec == 0) {
3594 ktime_t kt = ktime_get_real();
3595 sock_write_timestamp(sk, kt);
3596 ts = ktime_to_timespec64(kt);
3597 }
3598
3599 if (timeval)
3600 ts.tv_nsec /= 1000;
3601
3602#ifdef CONFIG_COMPAT_32BIT_TIME
3603 if (time32)
3604 return put_old_timespec32(&ts, userstamp);
3605#endif
3606#ifdef CONFIG_SPARC64
3607 /* beware of padding in sparc64 timeval */
3608 if (timeval && !in_compat_syscall()) {
3609 struct __kernel_old_timeval __user tv = {
3610 .tv_sec = ts.tv_sec,
3611 .tv_usec = ts.tv_nsec,
3612 };
3613 if (copy_to_user(userstamp, &tv, sizeof(tv)))
3614 return -EFAULT;
3615 return 0;
3616 }
3617#endif
3618 return put_timespec64(&ts, userstamp);
3619}
3620EXPORT_SYMBOL(sock_gettstamp);
3621
3622void sock_enable_timestamp(struct sock *sk, enum sock_flags flag)
3623{
3624 if (!sock_flag(sk, flag)) {
3625 unsigned long previous_flags = sk->sk_flags;
3626
3627 sock_set_flag(sk, flag);
3628 /*
3629 * we just set one of the two flags which require net
3630 * time stamping, but time stamping might have been on
3631 * already because of the other one
3632 */
3633 if (sock_needs_netstamp(sk) &&
3634 !(previous_flags & SK_FLAGS_TIMESTAMP))
3635 net_enable_timestamp();
3636 }
3637}
3638
3639int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
3640 int level, int type)
3641{
3642 struct sock_exterr_skb *serr;
3643 struct sk_buff *skb;
3644 int copied, err;
3645
3646 err = -EAGAIN;
3647 skb = sock_dequeue_err_skb(sk);
3648 if (skb == NULL)
3649 goto out;
3650
3651 copied = skb->len;
3652 if (copied > len) {
3653 msg->msg_flags |= MSG_TRUNC;
3654 copied = len;
3655 }
3656 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3657 if (err)
3658 goto out_free_skb;
3659
3660 sock_recv_timestamp(msg, sk, skb);
3661
3662 serr = SKB_EXT_ERR(skb);
3663 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
3664
3665 msg->msg_flags |= MSG_ERRQUEUE;
3666 err = copied;
3667
3668out_free_skb:
3669 kfree_skb(skb);
3670out:
3671 return err;
3672}
3673EXPORT_SYMBOL(sock_recv_errqueue);
3674
3675/*
3676 * Get a socket option on an socket.
3677 *
3678 * FIX: POSIX 1003.1g is very ambiguous here. It states that
3679 * asynchronous errors should be reported by getsockopt. We assume
3680 * this means if you specify SO_ERROR (otherwise whats the point of it).
3681 */
3682int sock_common_getsockopt(struct socket *sock, int level, int optname,
3683 char __user *optval, int __user *optlen)
3684{
3685 struct sock *sk = sock->sk;
3686
3687 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
3688 return READ_ONCE(sk->sk_prot)->getsockopt(sk, level, optname, optval, optlen);
3689}
3690EXPORT_SYMBOL(sock_common_getsockopt);
3691
3692int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
3693 int flags)
3694{
3695 struct sock *sk = sock->sk;
3696 int addr_len = 0;
3697 int err;
3698
3699 err = sk->sk_prot->recvmsg(sk, msg, size, flags, &addr_len);
3700 if (err >= 0)
3701 msg->msg_namelen = addr_len;
3702 return err;
3703}
3704EXPORT_SYMBOL(sock_common_recvmsg);
3705
3706/*
3707 * Set socket options on an inet socket.
3708 */
3709int sock_common_setsockopt(struct socket *sock, int level, int optname,
3710 sockptr_t optval, unsigned int optlen)
3711{
3712 struct sock *sk = sock->sk;
3713
3714 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
3715 return READ_ONCE(sk->sk_prot)->setsockopt(sk, level, optname, optval, optlen);
3716}
3717EXPORT_SYMBOL(sock_common_setsockopt);
3718
3719void sk_common_release(struct sock *sk)
3720{
3721 if (sk->sk_prot->destroy)
3722 sk->sk_prot->destroy(sk);
3723
3724 /*
3725 * Observation: when sk_common_release is called, processes have
3726 * no access to socket. But net still has.
3727 * Step one, detach it from networking:
3728 *
3729 * A. Remove from hash tables.
3730 */
3731
3732 sk->sk_prot->unhash(sk);
3733
3734 /*
3735 * In this point socket cannot receive new packets, but it is possible
3736 * that some packets are in flight because some CPU runs receiver and
3737 * did hash table lookup before we unhashed socket. They will achieve
3738 * receive queue and will be purged by socket destructor.
3739 *
3740 * Also we still have packets pending on receive queue and probably,
3741 * our own packets waiting in device queues. sock_destroy will drain
3742 * receive queue, but transmitted packets will delay socket destruction
3743 * until the last reference will be released.
3744 */
3745
3746 sock_orphan(sk);
3747
3748 xfrm_sk_free_policy(sk);
3749
3750 sock_put(sk);
3751}
3752EXPORT_SYMBOL(sk_common_release);
3753
3754void sk_get_meminfo(const struct sock *sk, u32 *mem)
3755{
3756 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
3757
3758 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
3759 mem[SK_MEMINFO_RCVBUF] = READ_ONCE(sk->sk_rcvbuf);
3760 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
3761 mem[SK_MEMINFO_SNDBUF] = READ_ONCE(sk->sk_sndbuf);
3762 mem[SK_MEMINFO_FWD_ALLOC] = sk_forward_alloc_get(sk);
3763 mem[SK_MEMINFO_WMEM_QUEUED] = READ_ONCE(sk->sk_wmem_queued);
3764 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
3765 mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len);
3766 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
3767}
3768
3769#ifdef CONFIG_PROC_FS
3770static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
3771
3772int sock_prot_inuse_get(struct net *net, struct proto *prot)
3773{
3774 int cpu, idx = prot->inuse_idx;
3775 int res = 0;
3776
3777 for_each_possible_cpu(cpu)
3778 res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx];
3779
3780 return res >= 0 ? res : 0;
3781}
3782EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
3783
3784int sock_inuse_get(struct net *net)
3785{
3786 int cpu, res = 0;
3787
3788 for_each_possible_cpu(cpu)
3789 res += per_cpu_ptr(net->core.prot_inuse, cpu)->all;
3790
3791 return res;
3792}
3793
3794EXPORT_SYMBOL_GPL(sock_inuse_get);
3795
3796static int __net_init sock_inuse_init_net(struct net *net)
3797{
3798 net->core.prot_inuse = alloc_percpu(struct prot_inuse);
3799 if (net->core.prot_inuse == NULL)
3800 return -ENOMEM;
3801 return 0;
3802}
3803
3804static void __net_exit sock_inuse_exit_net(struct net *net)
3805{
3806 free_percpu(net->core.prot_inuse);
3807}
3808
3809static struct pernet_operations net_inuse_ops = {
3810 .init = sock_inuse_init_net,
3811 .exit = sock_inuse_exit_net,
3812};
3813
3814static __init int net_inuse_init(void)
3815{
3816 if (register_pernet_subsys(&net_inuse_ops))
3817 panic("Cannot initialize net inuse counters");
3818
3819 return 0;
3820}
3821
3822core_initcall(net_inuse_init);
3823
3824static int assign_proto_idx(struct proto *prot)
3825{
3826 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
3827
3828 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
3829 pr_err("PROTO_INUSE_NR exhausted\n");
3830 return -ENOSPC;
3831 }
3832
3833 set_bit(prot->inuse_idx, proto_inuse_idx);
3834 return 0;
3835}
3836
3837static void release_proto_idx(struct proto *prot)
3838{
3839 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
3840 clear_bit(prot->inuse_idx, proto_inuse_idx);
3841}
3842#else
3843static inline int assign_proto_idx(struct proto *prot)
3844{
3845 return 0;
3846}
3847
3848static inline void release_proto_idx(struct proto *prot)
3849{
3850}
3851
3852#endif
3853
3854static void tw_prot_cleanup(struct timewait_sock_ops *twsk_prot)
3855{
3856 if (!twsk_prot)
3857 return;
3858 kfree(twsk_prot->twsk_slab_name);
3859 twsk_prot->twsk_slab_name = NULL;
3860 kmem_cache_destroy(twsk_prot->twsk_slab);
3861 twsk_prot->twsk_slab = NULL;
3862}
3863
3864static int tw_prot_init(const struct proto *prot)
3865{
3866 struct timewait_sock_ops *twsk_prot = prot->twsk_prot;
3867
3868 if (!twsk_prot)
3869 return 0;
3870
3871 twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s",
3872 prot->name);
3873 if (!twsk_prot->twsk_slab_name)
3874 return -ENOMEM;
3875
3876 twsk_prot->twsk_slab =
3877 kmem_cache_create(twsk_prot->twsk_slab_name,
3878 twsk_prot->twsk_obj_size, 0,
3879 SLAB_ACCOUNT | prot->slab_flags,
3880 NULL);
3881 if (!twsk_prot->twsk_slab) {
3882 pr_crit("%s: Can't create timewait sock SLAB cache!\n",
3883 prot->name);
3884 return -ENOMEM;
3885 }
3886
3887 return 0;
3888}
3889
3890static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
3891{
3892 if (!rsk_prot)
3893 return;
3894 kfree(rsk_prot->slab_name);
3895 rsk_prot->slab_name = NULL;
3896 kmem_cache_destroy(rsk_prot->slab);
3897 rsk_prot->slab = NULL;
3898}
3899
3900static int req_prot_init(const struct proto *prot)
3901{
3902 struct request_sock_ops *rsk_prot = prot->rsk_prot;
3903
3904 if (!rsk_prot)
3905 return 0;
3906
3907 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
3908 prot->name);
3909 if (!rsk_prot->slab_name)
3910 return -ENOMEM;
3911
3912 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
3913 rsk_prot->obj_size, 0,
3914 SLAB_ACCOUNT | prot->slab_flags,
3915 NULL);
3916
3917 if (!rsk_prot->slab) {
3918 pr_crit("%s: Can't create request sock SLAB cache!\n",
3919 prot->name);
3920 return -ENOMEM;
3921 }
3922 return 0;
3923}
3924
3925int proto_register(struct proto *prot, int alloc_slab)
3926{
3927 int ret = -ENOBUFS;
3928
3929 if (prot->memory_allocated && !prot->sysctl_mem) {
3930 pr_err("%s: missing sysctl_mem\n", prot->name);
3931 return -EINVAL;
3932 }
3933 if (prot->memory_allocated && !prot->per_cpu_fw_alloc) {
3934 pr_err("%s: missing per_cpu_fw_alloc\n", prot->name);
3935 return -EINVAL;
3936 }
3937 if (alloc_slab) {
3938 prot->slab = kmem_cache_create_usercopy(prot->name,
3939 prot->obj_size, 0,
3940 SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT |
3941 prot->slab_flags,
3942 prot->useroffset, prot->usersize,
3943 NULL);
3944
3945 if (prot->slab == NULL) {
3946 pr_crit("%s: Can't create sock SLAB cache!\n",
3947 prot->name);
3948 goto out;
3949 }
3950
3951 if (req_prot_init(prot))
3952 goto out_free_request_sock_slab;
3953
3954 if (tw_prot_init(prot))
3955 goto out_free_timewait_sock_slab;
3956 }
3957
3958 mutex_lock(&proto_list_mutex);
3959 ret = assign_proto_idx(prot);
3960 if (ret) {
3961 mutex_unlock(&proto_list_mutex);
3962 goto out_free_timewait_sock_slab;
3963 }
3964 list_add(&prot->node, &proto_list);
3965 mutex_unlock(&proto_list_mutex);
3966 return ret;
3967
3968out_free_timewait_sock_slab:
3969 if (alloc_slab)
3970 tw_prot_cleanup(prot->twsk_prot);
3971out_free_request_sock_slab:
3972 if (alloc_slab) {
3973 req_prot_cleanup(prot->rsk_prot);
3974
3975 kmem_cache_destroy(prot->slab);
3976 prot->slab = NULL;
3977 }
3978out:
3979 return ret;
3980}
3981EXPORT_SYMBOL(proto_register);
3982
3983void proto_unregister(struct proto *prot)
3984{
3985 mutex_lock(&proto_list_mutex);
3986 release_proto_idx(prot);
3987 list_del(&prot->node);
3988 mutex_unlock(&proto_list_mutex);
3989
3990 kmem_cache_destroy(prot->slab);
3991 prot->slab = NULL;
3992
3993 req_prot_cleanup(prot->rsk_prot);
3994 tw_prot_cleanup(prot->twsk_prot);
3995}
3996EXPORT_SYMBOL(proto_unregister);
3997
3998int sock_load_diag_module(int family, int protocol)
3999{
4000 if (!protocol) {
4001 if (!sock_is_registered(family))
4002 return -ENOENT;
4003
4004 return request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
4005 NETLINK_SOCK_DIAG, family);
4006 }
4007
4008#ifdef CONFIG_INET
4009 if (family == AF_INET &&
4010 protocol != IPPROTO_RAW &&
4011 protocol < MAX_INET_PROTOS &&
4012 !rcu_access_pointer(inet_protos[protocol]))
4013 return -ENOENT;
4014#endif
4015
4016 return request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
4017 NETLINK_SOCK_DIAG, family, protocol);
4018}
4019EXPORT_SYMBOL(sock_load_diag_module);
4020
4021#ifdef CONFIG_PROC_FS
4022static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
4023 __acquires(proto_list_mutex)
4024{
4025 mutex_lock(&proto_list_mutex);
4026 return seq_list_start_head(&proto_list, *pos);
4027}
4028
4029static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4030{
4031 return seq_list_next(v, &proto_list, pos);
4032}
4033
4034static void proto_seq_stop(struct seq_file *seq, void *v)
4035 __releases(proto_list_mutex)
4036{
4037 mutex_unlock(&proto_list_mutex);
4038}
4039
4040static char proto_method_implemented(const void *method)
4041{
4042 return method == NULL ? 'n' : 'y';
4043}
4044static long sock_prot_memory_allocated(struct proto *proto)
4045{
4046 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
4047}
4048
4049static const char *sock_prot_memory_pressure(struct proto *proto)
4050{
4051 return proto->memory_pressure != NULL ?
4052 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
4053}
4054
4055static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
4056{
4057
4058 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
4059 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
4060 proto->name,
4061 proto->obj_size,
4062 sock_prot_inuse_get(seq_file_net(seq), proto),
4063 sock_prot_memory_allocated(proto),
4064 sock_prot_memory_pressure(proto),
4065 proto->max_header,
4066 proto->slab == NULL ? "no" : "yes",
4067 module_name(proto->owner),
4068 proto_method_implemented(proto->close),
4069 proto_method_implemented(proto->connect),
4070 proto_method_implemented(proto->disconnect),
4071 proto_method_implemented(proto->accept),
4072 proto_method_implemented(proto->ioctl),
4073 proto_method_implemented(proto->init),
4074 proto_method_implemented(proto->destroy),
4075 proto_method_implemented(proto->shutdown),
4076 proto_method_implemented(proto->setsockopt),
4077 proto_method_implemented(proto->getsockopt),
4078 proto_method_implemented(proto->sendmsg),
4079 proto_method_implemented(proto->recvmsg),
4080 proto_method_implemented(proto->bind),
4081 proto_method_implemented(proto->backlog_rcv),
4082 proto_method_implemented(proto->hash),
4083 proto_method_implemented(proto->unhash),
4084 proto_method_implemented(proto->get_port),
4085 proto_method_implemented(proto->enter_memory_pressure));
4086}
4087
4088static int proto_seq_show(struct seq_file *seq, void *v)
4089{
4090 if (v == &proto_list)
4091 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
4092 "protocol",
4093 "size",
4094 "sockets",
4095 "memory",
4096 "press",
4097 "maxhdr",
4098 "slab",
4099 "module",
4100 "cl co di ac io in de sh ss gs se re bi br ha uh gp em\n");
4101 else
4102 proto_seq_printf(seq, list_entry(v, struct proto, node));
4103 return 0;
4104}
4105
4106static const struct seq_operations proto_seq_ops = {
4107 .start = proto_seq_start,
4108 .next = proto_seq_next,
4109 .stop = proto_seq_stop,
4110 .show = proto_seq_show,
4111};
4112
4113static __net_init int proto_init_net(struct net *net)
4114{
4115 if (!proc_create_net("protocols", 0444, net->proc_net, &proto_seq_ops,
4116 sizeof(struct seq_net_private)))
4117 return -ENOMEM;
4118
4119 return 0;
4120}
4121
4122static __net_exit void proto_exit_net(struct net *net)
4123{
4124 remove_proc_entry("protocols", net->proc_net);
4125}
4126
4127
4128static __net_initdata struct pernet_operations proto_net_ops = {
4129 .init = proto_init_net,
4130 .exit = proto_exit_net,
4131};
4132
4133static int __init proto_init(void)
4134{
4135 return register_pernet_subsys(&proto_net_ops);
4136}
4137
4138subsys_initcall(proto_init);
4139
4140#endif /* PROC_FS */
4141
4142#ifdef CONFIG_NET_RX_BUSY_POLL
4143bool sk_busy_loop_end(void *p, unsigned long start_time)
4144{
4145 struct sock *sk = p;
4146
4147 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
4148 return true;
4149
4150 if (sk_is_udp(sk) &&
4151 !skb_queue_empty_lockless(&udp_sk(sk)->reader_queue))
4152 return true;
4153
4154 return sk_busy_loop_timeout(sk, start_time);
4155}
4156EXPORT_SYMBOL(sk_busy_loop_end);
4157#endif /* CONFIG_NET_RX_BUSY_POLL */
4158
4159int sock_bind_add(struct sock *sk, struct sockaddr *addr, int addr_len)
4160{
4161 if (!sk->sk_prot->bind_add)
4162 return -EOPNOTSUPP;
4163 return sk->sk_prot->bind_add(sk, addr, addr_len);
4164}
4165EXPORT_SYMBOL(sock_bind_add);
4166
4167/* Copy 'size' bytes from userspace and return `size` back to userspace */
4168int sock_ioctl_inout(struct sock *sk, unsigned int cmd,
4169 void __user *arg, void *karg, size_t size)
4170{
4171 int ret;
4172
4173 if (copy_from_user(karg, arg, size))
4174 return -EFAULT;
4175
4176 ret = READ_ONCE(sk->sk_prot)->ioctl(sk, cmd, karg);
4177 if (ret)
4178 return ret;
4179
4180 if (copy_to_user(arg, karg, size))
4181 return -EFAULT;
4182
4183 return 0;
4184}
4185EXPORT_SYMBOL(sock_ioctl_inout);
4186
4187/* This is the most common ioctl prep function, where the result (4 bytes) is
4188 * copied back to userspace if the ioctl() returns successfully. No input is
4189 * copied from userspace as input argument.
4190 */
4191static int sock_ioctl_out(struct sock *sk, unsigned int cmd, void __user *arg)
4192{
4193 int ret, karg = 0;
4194
4195 ret = READ_ONCE(sk->sk_prot)->ioctl(sk, cmd, &karg);
4196 if (ret)
4197 return ret;
4198
4199 return put_user(karg, (int __user *)arg);
4200}
4201
4202/* A wrapper around sock ioctls, which copies the data from userspace
4203 * (depending on the protocol/ioctl), and copies back the result to userspace.
4204 * The main motivation for this function is to pass kernel memory to the
4205 * protocol ioctl callbacks, instead of userspace memory.
4206 */
4207int sk_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
4208{
4209 int rc = 1;
4210
4211 if (sk->sk_type == SOCK_RAW && sk->sk_family == AF_INET)
4212 rc = ipmr_sk_ioctl(sk, cmd, arg);
4213 else if (sk->sk_type == SOCK_RAW && sk->sk_family == AF_INET6)
4214 rc = ip6mr_sk_ioctl(sk, cmd, arg);
4215 else if (sk_is_phonet(sk))
4216 rc = phonet_sk_ioctl(sk, cmd, arg);
4217
4218 /* If ioctl was processed, returns its value */
4219 if (rc <= 0)
4220 return rc;
4221
4222 /* Otherwise call the default handler */
4223 return sock_ioctl_out(sk, cmd, arg);
4224}
4225EXPORT_SYMBOL(sk_ioctl);
1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
10 * Authors: Ross Biro
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
35 * code. The ACK stuff can wait and needs major
36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 *
85 *
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
90 */
91
92#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
93
94#include <linux/capability.h>
95#include <linux/errno.h>
96#include <linux/errqueue.h>
97#include <linux/types.h>
98#include <linux/socket.h>
99#include <linux/in.h>
100#include <linux/kernel.h>
101#include <linux/module.h>
102#include <linux/proc_fs.h>
103#include <linux/seq_file.h>
104#include <linux/sched.h>
105#include <linux/sched/mm.h>
106#include <linux/timer.h>
107#include <linux/string.h>
108#include <linux/sockios.h>
109#include <linux/net.h>
110#include <linux/mm.h>
111#include <linux/slab.h>
112#include <linux/interrupt.h>
113#include <linux/poll.h>
114#include <linux/tcp.h>
115#include <linux/init.h>
116#include <linux/highmem.h>
117#include <linux/user_namespace.h>
118#include <linux/static_key.h>
119#include <linux/memcontrol.h>
120#include <linux/prefetch.h>
121
122#include <linux/uaccess.h>
123
124#include <linux/netdevice.h>
125#include <net/protocol.h>
126#include <linux/skbuff.h>
127#include <net/net_namespace.h>
128#include <net/request_sock.h>
129#include <net/sock.h>
130#include <linux/net_tstamp.h>
131#include <net/xfrm.h>
132#include <linux/ipsec.h>
133#include <net/cls_cgroup.h>
134#include <net/netprio_cgroup.h>
135#include <linux/sock_diag.h>
136
137#include <linux/filter.h>
138#include <net/sock_reuseport.h>
139
140#include <trace/events/sock.h>
141
142#include <net/tcp.h>
143#include <net/busy_poll.h>
144
145static DEFINE_MUTEX(proto_list_mutex);
146static LIST_HEAD(proto_list);
147
148static void sock_inuse_add(struct net *net, int val);
149
150/**
151 * sk_ns_capable - General socket capability test
152 * @sk: Socket to use a capability on or through
153 * @user_ns: The user namespace of the capability to use
154 * @cap: The capability to use
155 *
156 * Test to see if the opener of the socket had when the socket was
157 * created and the current process has the capability @cap in the user
158 * namespace @user_ns.
159 */
160bool sk_ns_capable(const struct sock *sk,
161 struct user_namespace *user_ns, int cap)
162{
163 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
164 ns_capable(user_ns, cap);
165}
166EXPORT_SYMBOL(sk_ns_capable);
167
168/**
169 * sk_capable - Socket global capability test
170 * @sk: Socket to use a capability on or through
171 * @cap: The global capability to use
172 *
173 * Test to see if the opener of the socket had when the socket was
174 * created and the current process has the capability @cap in all user
175 * namespaces.
176 */
177bool sk_capable(const struct sock *sk, int cap)
178{
179 return sk_ns_capable(sk, &init_user_ns, cap);
180}
181EXPORT_SYMBOL(sk_capable);
182
183/**
184 * sk_net_capable - Network namespace socket capability test
185 * @sk: Socket to use a capability on or through
186 * @cap: The capability to use
187 *
188 * Test to see if the opener of the socket had when the socket was created
189 * and the current process has the capability @cap over the network namespace
190 * the socket is a member of.
191 */
192bool sk_net_capable(const struct sock *sk, int cap)
193{
194 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
195}
196EXPORT_SYMBOL(sk_net_capable);
197
198/*
199 * Each address family might have different locking rules, so we have
200 * one slock key per address family and separate keys for internal and
201 * userspace sockets.
202 */
203static struct lock_class_key af_family_keys[AF_MAX];
204static struct lock_class_key af_family_kern_keys[AF_MAX];
205static struct lock_class_key af_family_slock_keys[AF_MAX];
206static struct lock_class_key af_family_kern_slock_keys[AF_MAX];
207
208/*
209 * Make lock validator output more readable. (we pre-construct these
210 * strings build-time, so that runtime initialization of socket
211 * locks is fast):
212 */
213
214#define _sock_locks(x) \
215 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \
216 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \
217 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \
218 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \
219 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \
220 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \
221 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \
222 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \
223 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \
224 x "27" , x "28" , x "AF_CAN" , \
225 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \
226 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \
227 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \
228 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \
229 x "AF_QIPCRTR", x "AF_SMC" , x "AF_MAX"
230
231static const char *const af_family_key_strings[AF_MAX+1] = {
232 _sock_locks("sk_lock-")
233};
234static const char *const af_family_slock_key_strings[AF_MAX+1] = {
235 _sock_locks("slock-")
236};
237static const char *const af_family_clock_key_strings[AF_MAX+1] = {
238 _sock_locks("clock-")
239};
240
241static const char *const af_family_kern_key_strings[AF_MAX+1] = {
242 _sock_locks("k-sk_lock-")
243};
244static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = {
245 _sock_locks("k-slock-")
246};
247static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = {
248 _sock_locks("k-clock-")
249};
250static const char *const af_family_rlock_key_strings[AF_MAX+1] = {
251 "rlock-AF_UNSPEC", "rlock-AF_UNIX" , "rlock-AF_INET" ,
252 "rlock-AF_AX25" , "rlock-AF_IPX" , "rlock-AF_APPLETALK",
253 "rlock-AF_NETROM", "rlock-AF_BRIDGE" , "rlock-AF_ATMPVC" ,
254 "rlock-AF_X25" , "rlock-AF_INET6" , "rlock-AF_ROSE" ,
255 "rlock-AF_DECnet", "rlock-AF_NETBEUI" , "rlock-AF_SECURITY" ,
256 "rlock-AF_KEY" , "rlock-AF_NETLINK" , "rlock-AF_PACKET" ,
257 "rlock-AF_ASH" , "rlock-AF_ECONET" , "rlock-AF_ATMSVC" ,
258 "rlock-AF_RDS" , "rlock-AF_SNA" , "rlock-AF_IRDA" ,
259 "rlock-AF_PPPOX" , "rlock-AF_WANPIPE" , "rlock-AF_LLC" ,
260 "rlock-27" , "rlock-28" , "rlock-AF_CAN" ,
261 "rlock-AF_TIPC" , "rlock-AF_BLUETOOTH", "rlock-AF_IUCV" ,
262 "rlock-AF_RXRPC" , "rlock-AF_ISDN" , "rlock-AF_PHONET" ,
263 "rlock-AF_IEEE802154", "rlock-AF_CAIF" , "rlock-AF_ALG" ,
264 "rlock-AF_NFC" , "rlock-AF_VSOCK" , "rlock-AF_KCM" ,
265 "rlock-AF_QIPCRTR", "rlock-AF_SMC" , "rlock-AF_MAX"
266};
267static const char *const af_family_wlock_key_strings[AF_MAX+1] = {
268 "wlock-AF_UNSPEC", "wlock-AF_UNIX" , "wlock-AF_INET" ,
269 "wlock-AF_AX25" , "wlock-AF_IPX" , "wlock-AF_APPLETALK",
270 "wlock-AF_NETROM", "wlock-AF_BRIDGE" , "wlock-AF_ATMPVC" ,
271 "wlock-AF_X25" , "wlock-AF_INET6" , "wlock-AF_ROSE" ,
272 "wlock-AF_DECnet", "wlock-AF_NETBEUI" , "wlock-AF_SECURITY" ,
273 "wlock-AF_KEY" , "wlock-AF_NETLINK" , "wlock-AF_PACKET" ,
274 "wlock-AF_ASH" , "wlock-AF_ECONET" , "wlock-AF_ATMSVC" ,
275 "wlock-AF_RDS" , "wlock-AF_SNA" , "wlock-AF_IRDA" ,
276 "wlock-AF_PPPOX" , "wlock-AF_WANPIPE" , "wlock-AF_LLC" ,
277 "wlock-27" , "wlock-28" , "wlock-AF_CAN" ,
278 "wlock-AF_TIPC" , "wlock-AF_BLUETOOTH", "wlock-AF_IUCV" ,
279 "wlock-AF_RXRPC" , "wlock-AF_ISDN" , "wlock-AF_PHONET" ,
280 "wlock-AF_IEEE802154", "wlock-AF_CAIF" , "wlock-AF_ALG" ,
281 "wlock-AF_NFC" , "wlock-AF_VSOCK" , "wlock-AF_KCM" ,
282 "wlock-AF_QIPCRTR", "wlock-AF_SMC" , "wlock-AF_MAX"
283};
284static const char *const af_family_elock_key_strings[AF_MAX+1] = {
285 "elock-AF_UNSPEC", "elock-AF_UNIX" , "elock-AF_INET" ,
286 "elock-AF_AX25" , "elock-AF_IPX" , "elock-AF_APPLETALK",
287 "elock-AF_NETROM", "elock-AF_BRIDGE" , "elock-AF_ATMPVC" ,
288 "elock-AF_X25" , "elock-AF_INET6" , "elock-AF_ROSE" ,
289 "elock-AF_DECnet", "elock-AF_NETBEUI" , "elock-AF_SECURITY" ,
290 "elock-AF_KEY" , "elock-AF_NETLINK" , "elock-AF_PACKET" ,
291 "elock-AF_ASH" , "elock-AF_ECONET" , "elock-AF_ATMSVC" ,
292 "elock-AF_RDS" , "elock-AF_SNA" , "elock-AF_IRDA" ,
293 "elock-AF_PPPOX" , "elock-AF_WANPIPE" , "elock-AF_LLC" ,
294 "elock-27" , "elock-28" , "elock-AF_CAN" ,
295 "elock-AF_TIPC" , "elock-AF_BLUETOOTH", "elock-AF_IUCV" ,
296 "elock-AF_RXRPC" , "elock-AF_ISDN" , "elock-AF_PHONET" ,
297 "elock-AF_IEEE802154", "elock-AF_CAIF" , "elock-AF_ALG" ,
298 "elock-AF_NFC" , "elock-AF_VSOCK" , "elock-AF_KCM" ,
299 "elock-AF_QIPCRTR", "elock-AF_SMC" , "elock-AF_MAX"
300};
301
302/*
303 * sk_callback_lock and sk queues locking rules are per-address-family,
304 * so split the lock classes by using a per-AF key:
305 */
306static struct lock_class_key af_callback_keys[AF_MAX];
307static struct lock_class_key af_rlock_keys[AF_MAX];
308static struct lock_class_key af_wlock_keys[AF_MAX];
309static struct lock_class_key af_elock_keys[AF_MAX];
310static struct lock_class_key af_kern_callback_keys[AF_MAX];
311
312/* Run time adjustable parameters. */
313__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
314EXPORT_SYMBOL(sysctl_wmem_max);
315__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
316EXPORT_SYMBOL(sysctl_rmem_max);
317__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
318__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
319
320/* Maximal space eaten by iovec or ancillary data plus some space */
321int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
322EXPORT_SYMBOL(sysctl_optmem_max);
323
324int sysctl_tstamp_allow_data __read_mostly = 1;
325
326struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
327EXPORT_SYMBOL_GPL(memalloc_socks);
328
329/**
330 * sk_set_memalloc - sets %SOCK_MEMALLOC
331 * @sk: socket to set it on
332 *
333 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
334 * It's the responsibility of the admin to adjust min_free_kbytes
335 * to meet the requirements
336 */
337void sk_set_memalloc(struct sock *sk)
338{
339 sock_set_flag(sk, SOCK_MEMALLOC);
340 sk->sk_allocation |= __GFP_MEMALLOC;
341 static_key_slow_inc(&memalloc_socks);
342}
343EXPORT_SYMBOL_GPL(sk_set_memalloc);
344
345void sk_clear_memalloc(struct sock *sk)
346{
347 sock_reset_flag(sk, SOCK_MEMALLOC);
348 sk->sk_allocation &= ~__GFP_MEMALLOC;
349 static_key_slow_dec(&memalloc_socks);
350
351 /*
352 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
353 * progress of swapping. SOCK_MEMALLOC may be cleared while
354 * it has rmem allocations due to the last swapfile being deactivated
355 * but there is a risk that the socket is unusable due to exceeding
356 * the rmem limits. Reclaim the reserves and obey rmem limits again.
357 */
358 sk_mem_reclaim(sk);
359}
360EXPORT_SYMBOL_GPL(sk_clear_memalloc);
361
362int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
363{
364 int ret;
365 unsigned int noreclaim_flag;
366
367 /* these should have been dropped before queueing */
368 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
369
370 noreclaim_flag = memalloc_noreclaim_save();
371 ret = sk->sk_backlog_rcv(sk, skb);
372 memalloc_noreclaim_restore(noreclaim_flag);
373
374 return ret;
375}
376EXPORT_SYMBOL(__sk_backlog_rcv);
377
378static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
379{
380 struct timeval tv;
381
382 if (optlen < sizeof(tv))
383 return -EINVAL;
384 if (copy_from_user(&tv, optval, sizeof(tv)))
385 return -EFAULT;
386 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
387 return -EDOM;
388
389 if (tv.tv_sec < 0) {
390 static int warned __read_mostly;
391
392 *timeo_p = 0;
393 if (warned < 10 && net_ratelimit()) {
394 warned++;
395 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
396 __func__, current->comm, task_pid_nr(current));
397 }
398 return 0;
399 }
400 *timeo_p = MAX_SCHEDULE_TIMEOUT;
401 if (tv.tv_sec == 0 && tv.tv_usec == 0)
402 return 0;
403 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
404 *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP(tv.tv_usec, USEC_PER_SEC / HZ);
405 return 0;
406}
407
408static void sock_warn_obsolete_bsdism(const char *name)
409{
410 static int warned;
411 static char warncomm[TASK_COMM_LEN];
412 if (strcmp(warncomm, current->comm) && warned < 5) {
413 strcpy(warncomm, current->comm);
414 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
415 warncomm, name);
416 warned++;
417 }
418}
419
420static bool sock_needs_netstamp(const struct sock *sk)
421{
422 switch (sk->sk_family) {
423 case AF_UNSPEC:
424 case AF_UNIX:
425 return false;
426 default:
427 return true;
428 }
429}
430
431static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
432{
433 if (sk->sk_flags & flags) {
434 sk->sk_flags &= ~flags;
435 if (sock_needs_netstamp(sk) &&
436 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
437 net_disable_timestamp();
438 }
439}
440
441
442int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
443{
444 unsigned long flags;
445 struct sk_buff_head *list = &sk->sk_receive_queue;
446
447 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
448 atomic_inc(&sk->sk_drops);
449 trace_sock_rcvqueue_full(sk, skb);
450 return -ENOMEM;
451 }
452
453 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
454 atomic_inc(&sk->sk_drops);
455 return -ENOBUFS;
456 }
457
458 skb->dev = NULL;
459 skb_set_owner_r(skb, sk);
460
461 /* we escape from rcu protected region, make sure we dont leak
462 * a norefcounted dst
463 */
464 skb_dst_force(skb);
465
466 spin_lock_irqsave(&list->lock, flags);
467 sock_skb_set_dropcount(sk, skb);
468 __skb_queue_tail(list, skb);
469 spin_unlock_irqrestore(&list->lock, flags);
470
471 if (!sock_flag(sk, SOCK_DEAD))
472 sk->sk_data_ready(sk);
473 return 0;
474}
475EXPORT_SYMBOL(__sock_queue_rcv_skb);
476
477int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
478{
479 int err;
480
481 err = sk_filter(sk, skb);
482 if (err)
483 return err;
484
485 return __sock_queue_rcv_skb(sk, skb);
486}
487EXPORT_SYMBOL(sock_queue_rcv_skb);
488
489int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
490 const int nested, unsigned int trim_cap, bool refcounted)
491{
492 int rc = NET_RX_SUCCESS;
493
494 if (sk_filter_trim_cap(sk, skb, trim_cap))
495 goto discard_and_relse;
496
497 skb->dev = NULL;
498
499 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
500 atomic_inc(&sk->sk_drops);
501 goto discard_and_relse;
502 }
503 if (nested)
504 bh_lock_sock_nested(sk);
505 else
506 bh_lock_sock(sk);
507 if (!sock_owned_by_user(sk)) {
508 /*
509 * trylock + unlock semantics:
510 */
511 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
512
513 rc = sk_backlog_rcv(sk, skb);
514
515 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
516 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
517 bh_unlock_sock(sk);
518 atomic_inc(&sk->sk_drops);
519 goto discard_and_relse;
520 }
521
522 bh_unlock_sock(sk);
523out:
524 if (refcounted)
525 sock_put(sk);
526 return rc;
527discard_and_relse:
528 kfree_skb(skb);
529 goto out;
530}
531EXPORT_SYMBOL(__sk_receive_skb);
532
533struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
534{
535 struct dst_entry *dst = __sk_dst_get(sk);
536
537 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
538 sk_tx_queue_clear(sk);
539 sk->sk_dst_pending_confirm = 0;
540 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
541 dst_release(dst);
542 return NULL;
543 }
544
545 return dst;
546}
547EXPORT_SYMBOL(__sk_dst_check);
548
549struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
550{
551 struct dst_entry *dst = sk_dst_get(sk);
552
553 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
554 sk_dst_reset(sk);
555 dst_release(dst);
556 return NULL;
557 }
558
559 return dst;
560}
561EXPORT_SYMBOL(sk_dst_check);
562
563static int sock_setbindtodevice(struct sock *sk, char __user *optval,
564 int optlen)
565{
566 int ret = -ENOPROTOOPT;
567#ifdef CONFIG_NETDEVICES
568 struct net *net = sock_net(sk);
569 char devname[IFNAMSIZ];
570 int index;
571
572 /* Sorry... */
573 ret = -EPERM;
574 if (!ns_capable(net->user_ns, CAP_NET_RAW))
575 goto out;
576
577 ret = -EINVAL;
578 if (optlen < 0)
579 goto out;
580
581 /* Bind this socket to a particular device like "eth0",
582 * as specified in the passed interface name. If the
583 * name is "" or the option length is zero the socket
584 * is not bound.
585 */
586 if (optlen > IFNAMSIZ - 1)
587 optlen = IFNAMSIZ - 1;
588 memset(devname, 0, sizeof(devname));
589
590 ret = -EFAULT;
591 if (copy_from_user(devname, optval, optlen))
592 goto out;
593
594 index = 0;
595 if (devname[0] != '\0') {
596 struct net_device *dev;
597
598 rcu_read_lock();
599 dev = dev_get_by_name_rcu(net, devname);
600 if (dev)
601 index = dev->ifindex;
602 rcu_read_unlock();
603 ret = -ENODEV;
604 if (!dev)
605 goto out;
606 }
607
608 lock_sock(sk);
609 sk->sk_bound_dev_if = index;
610 sk_dst_reset(sk);
611 release_sock(sk);
612
613 ret = 0;
614
615out:
616#endif
617
618 return ret;
619}
620
621static int sock_getbindtodevice(struct sock *sk, char __user *optval,
622 int __user *optlen, int len)
623{
624 int ret = -ENOPROTOOPT;
625#ifdef CONFIG_NETDEVICES
626 struct net *net = sock_net(sk);
627 char devname[IFNAMSIZ];
628
629 if (sk->sk_bound_dev_if == 0) {
630 len = 0;
631 goto zero;
632 }
633
634 ret = -EINVAL;
635 if (len < IFNAMSIZ)
636 goto out;
637
638 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
639 if (ret)
640 goto out;
641
642 len = strlen(devname) + 1;
643
644 ret = -EFAULT;
645 if (copy_to_user(optval, devname, len))
646 goto out;
647
648zero:
649 ret = -EFAULT;
650 if (put_user(len, optlen))
651 goto out;
652
653 ret = 0;
654
655out:
656#endif
657
658 return ret;
659}
660
661static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
662{
663 if (valbool)
664 sock_set_flag(sk, bit);
665 else
666 sock_reset_flag(sk, bit);
667}
668
669bool sk_mc_loop(struct sock *sk)
670{
671 if (dev_recursion_level())
672 return false;
673 if (!sk)
674 return true;
675 switch (sk->sk_family) {
676 case AF_INET:
677 return inet_sk(sk)->mc_loop;
678#if IS_ENABLED(CONFIG_IPV6)
679 case AF_INET6:
680 return inet6_sk(sk)->mc_loop;
681#endif
682 }
683 WARN_ON(1);
684 return true;
685}
686EXPORT_SYMBOL(sk_mc_loop);
687
688/*
689 * This is meant for all protocols to use and covers goings on
690 * at the socket level. Everything here is generic.
691 */
692
693int sock_setsockopt(struct socket *sock, int level, int optname,
694 char __user *optval, unsigned int optlen)
695{
696 struct sock *sk = sock->sk;
697 int val;
698 int valbool;
699 struct linger ling;
700 int ret = 0;
701
702 /*
703 * Options without arguments
704 */
705
706 if (optname == SO_BINDTODEVICE)
707 return sock_setbindtodevice(sk, optval, optlen);
708
709 if (optlen < sizeof(int))
710 return -EINVAL;
711
712 if (get_user(val, (int __user *)optval))
713 return -EFAULT;
714
715 valbool = val ? 1 : 0;
716
717 lock_sock(sk);
718
719 switch (optname) {
720 case SO_DEBUG:
721 if (val && !capable(CAP_NET_ADMIN))
722 ret = -EACCES;
723 else
724 sock_valbool_flag(sk, SOCK_DBG, valbool);
725 break;
726 case SO_REUSEADDR:
727 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
728 break;
729 case SO_REUSEPORT:
730 sk->sk_reuseport = valbool;
731 break;
732 case SO_TYPE:
733 case SO_PROTOCOL:
734 case SO_DOMAIN:
735 case SO_ERROR:
736 ret = -ENOPROTOOPT;
737 break;
738 case SO_DONTROUTE:
739 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
740 break;
741 case SO_BROADCAST:
742 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
743 break;
744 case SO_SNDBUF:
745 /* Don't error on this BSD doesn't and if you think
746 * about it this is right. Otherwise apps have to
747 * play 'guess the biggest size' games. RCVBUF/SNDBUF
748 * are treated in BSD as hints
749 */
750 val = min_t(u32, val, sysctl_wmem_max);
751set_sndbuf:
752 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
753 sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF);
754 /* Wake up sending tasks if we upped the value. */
755 sk->sk_write_space(sk);
756 break;
757
758 case SO_SNDBUFFORCE:
759 if (!capable(CAP_NET_ADMIN)) {
760 ret = -EPERM;
761 break;
762 }
763 goto set_sndbuf;
764
765 case SO_RCVBUF:
766 /* Don't error on this BSD doesn't and if you think
767 * about it this is right. Otherwise apps have to
768 * play 'guess the biggest size' games. RCVBUF/SNDBUF
769 * are treated in BSD as hints
770 */
771 val = min_t(u32, val, sysctl_rmem_max);
772set_rcvbuf:
773 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
774 /*
775 * We double it on the way in to account for
776 * "struct sk_buff" etc. overhead. Applications
777 * assume that the SO_RCVBUF setting they make will
778 * allow that much actual data to be received on that
779 * socket.
780 *
781 * Applications are unaware that "struct sk_buff" and
782 * other overheads allocate from the receive buffer
783 * during socket buffer allocation.
784 *
785 * And after considering the possible alternatives,
786 * returning the value we actually used in getsockopt
787 * is the most desirable behavior.
788 */
789 sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF);
790 break;
791
792 case SO_RCVBUFFORCE:
793 if (!capable(CAP_NET_ADMIN)) {
794 ret = -EPERM;
795 break;
796 }
797 goto set_rcvbuf;
798
799 case SO_KEEPALIVE:
800 if (sk->sk_prot->keepalive)
801 sk->sk_prot->keepalive(sk, valbool);
802 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
803 break;
804
805 case SO_OOBINLINE:
806 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
807 break;
808
809 case SO_NO_CHECK:
810 sk->sk_no_check_tx = valbool;
811 break;
812
813 case SO_PRIORITY:
814 if ((val >= 0 && val <= 6) ||
815 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
816 sk->sk_priority = val;
817 else
818 ret = -EPERM;
819 break;
820
821 case SO_LINGER:
822 if (optlen < sizeof(ling)) {
823 ret = -EINVAL; /* 1003.1g */
824 break;
825 }
826 if (copy_from_user(&ling, optval, sizeof(ling))) {
827 ret = -EFAULT;
828 break;
829 }
830 if (!ling.l_onoff)
831 sock_reset_flag(sk, SOCK_LINGER);
832 else {
833#if (BITS_PER_LONG == 32)
834 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
835 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
836 else
837#endif
838 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
839 sock_set_flag(sk, SOCK_LINGER);
840 }
841 break;
842
843 case SO_BSDCOMPAT:
844 sock_warn_obsolete_bsdism("setsockopt");
845 break;
846
847 case SO_PASSCRED:
848 if (valbool)
849 set_bit(SOCK_PASSCRED, &sock->flags);
850 else
851 clear_bit(SOCK_PASSCRED, &sock->flags);
852 break;
853
854 case SO_TIMESTAMP:
855 case SO_TIMESTAMPNS:
856 if (valbool) {
857 if (optname == SO_TIMESTAMP)
858 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
859 else
860 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
861 sock_set_flag(sk, SOCK_RCVTSTAMP);
862 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
863 } else {
864 sock_reset_flag(sk, SOCK_RCVTSTAMP);
865 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
866 }
867 break;
868
869 case SO_TIMESTAMPING:
870 if (val & ~SOF_TIMESTAMPING_MASK) {
871 ret = -EINVAL;
872 break;
873 }
874
875 if (val & SOF_TIMESTAMPING_OPT_ID &&
876 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
877 if (sk->sk_protocol == IPPROTO_TCP &&
878 sk->sk_type == SOCK_STREAM) {
879 if ((1 << sk->sk_state) &
880 (TCPF_CLOSE | TCPF_LISTEN)) {
881 ret = -EINVAL;
882 break;
883 }
884 sk->sk_tskey = tcp_sk(sk)->snd_una;
885 } else {
886 sk->sk_tskey = 0;
887 }
888 }
889
890 if (val & SOF_TIMESTAMPING_OPT_STATS &&
891 !(val & SOF_TIMESTAMPING_OPT_TSONLY)) {
892 ret = -EINVAL;
893 break;
894 }
895
896 sk->sk_tsflags = val;
897 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
898 sock_enable_timestamp(sk,
899 SOCK_TIMESTAMPING_RX_SOFTWARE);
900 else
901 sock_disable_timestamp(sk,
902 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
903 break;
904
905 case SO_RCVLOWAT:
906 if (val < 0)
907 val = INT_MAX;
908 sk->sk_rcvlowat = val ? : 1;
909 break;
910
911 case SO_RCVTIMEO:
912 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
913 break;
914
915 case SO_SNDTIMEO:
916 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
917 break;
918
919 case SO_ATTACH_FILTER:
920 ret = -EINVAL;
921 if (optlen == sizeof(struct sock_fprog)) {
922 struct sock_fprog fprog;
923
924 ret = -EFAULT;
925 if (copy_from_user(&fprog, optval, sizeof(fprog)))
926 break;
927
928 ret = sk_attach_filter(&fprog, sk);
929 }
930 break;
931
932 case SO_ATTACH_BPF:
933 ret = -EINVAL;
934 if (optlen == sizeof(u32)) {
935 u32 ufd;
936
937 ret = -EFAULT;
938 if (copy_from_user(&ufd, optval, sizeof(ufd)))
939 break;
940
941 ret = sk_attach_bpf(ufd, sk);
942 }
943 break;
944
945 case SO_ATTACH_REUSEPORT_CBPF:
946 ret = -EINVAL;
947 if (optlen == sizeof(struct sock_fprog)) {
948 struct sock_fprog fprog;
949
950 ret = -EFAULT;
951 if (copy_from_user(&fprog, optval, sizeof(fprog)))
952 break;
953
954 ret = sk_reuseport_attach_filter(&fprog, sk);
955 }
956 break;
957
958 case SO_ATTACH_REUSEPORT_EBPF:
959 ret = -EINVAL;
960 if (optlen == sizeof(u32)) {
961 u32 ufd;
962
963 ret = -EFAULT;
964 if (copy_from_user(&ufd, optval, sizeof(ufd)))
965 break;
966
967 ret = sk_reuseport_attach_bpf(ufd, sk);
968 }
969 break;
970
971 case SO_DETACH_FILTER:
972 ret = sk_detach_filter(sk);
973 break;
974
975 case SO_LOCK_FILTER:
976 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
977 ret = -EPERM;
978 else
979 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
980 break;
981
982 case SO_PASSSEC:
983 if (valbool)
984 set_bit(SOCK_PASSSEC, &sock->flags);
985 else
986 clear_bit(SOCK_PASSSEC, &sock->flags);
987 break;
988 case SO_MARK:
989 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
990 ret = -EPERM;
991 else
992 sk->sk_mark = val;
993 break;
994
995 case SO_RXQ_OVFL:
996 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
997 break;
998
999 case SO_WIFI_STATUS:
1000 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
1001 break;
1002
1003 case SO_PEEK_OFF:
1004 if (sock->ops->set_peek_off)
1005 ret = sock->ops->set_peek_off(sk, val);
1006 else
1007 ret = -EOPNOTSUPP;
1008 break;
1009
1010 case SO_NOFCS:
1011 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
1012 break;
1013
1014 case SO_SELECT_ERR_QUEUE:
1015 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
1016 break;
1017
1018#ifdef CONFIG_NET_RX_BUSY_POLL
1019 case SO_BUSY_POLL:
1020 /* allow unprivileged users to decrease the value */
1021 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
1022 ret = -EPERM;
1023 else {
1024 if (val < 0)
1025 ret = -EINVAL;
1026 else
1027 sk->sk_ll_usec = val;
1028 }
1029 break;
1030#endif
1031
1032 case SO_MAX_PACING_RATE:
1033 if (val != ~0U)
1034 cmpxchg(&sk->sk_pacing_status,
1035 SK_PACING_NONE,
1036 SK_PACING_NEEDED);
1037 sk->sk_max_pacing_rate = val;
1038 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
1039 sk->sk_max_pacing_rate);
1040 break;
1041
1042 case SO_INCOMING_CPU:
1043 sk->sk_incoming_cpu = val;
1044 break;
1045
1046 case SO_CNX_ADVICE:
1047 if (val == 1)
1048 dst_negative_advice(sk);
1049 break;
1050
1051 case SO_ZEROCOPY:
1052 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) {
1053 if (sk->sk_protocol != IPPROTO_TCP)
1054 ret = -ENOTSUPP;
1055 } else if (sk->sk_family != PF_RDS) {
1056 ret = -ENOTSUPP;
1057 }
1058 if (!ret) {
1059 if (val < 0 || val > 1)
1060 ret = -EINVAL;
1061 else
1062 sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool);
1063 }
1064 break;
1065
1066 default:
1067 ret = -ENOPROTOOPT;
1068 break;
1069 }
1070 release_sock(sk);
1071 return ret;
1072}
1073EXPORT_SYMBOL(sock_setsockopt);
1074
1075
1076static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1077 struct ucred *ucred)
1078{
1079 ucred->pid = pid_vnr(pid);
1080 ucred->uid = ucred->gid = -1;
1081 if (cred) {
1082 struct user_namespace *current_ns = current_user_ns();
1083
1084 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1085 ucred->gid = from_kgid_munged(current_ns, cred->egid);
1086 }
1087}
1088
1089static int groups_to_user(gid_t __user *dst, const struct group_info *src)
1090{
1091 struct user_namespace *user_ns = current_user_ns();
1092 int i;
1093
1094 for (i = 0; i < src->ngroups; i++)
1095 if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i))
1096 return -EFAULT;
1097
1098 return 0;
1099}
1100
1101int sock_getsockopt(struct socket *sock, int level, int optname,
1102 char __user *optval, int __user *optlen)
1103{
1104 struct sock *sk = sock->sk;
1105
1106 union {
1107 int val;
1108 u64 val64;
1109 struct linger ling;
1110 struct timeval tm;
1111 } v;
1112
1113 int lv = sizeof(int);
1114 int len;
1115
1116 if (get_user(len, optlen))
1117 return -EFAULT;
1118 if (len < 0)
1119 return -EINVAL;
1120
1121 memset(&v, 0, sizeof(v));
1122
1123 switch (optname) {
1124 case SO_DEBUG:
1125 v.val = sock_flag(sk, SOCK_DBG);
1126 break;
1127
1128 case SO_DONTROUTE:
1129 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1130 break;
1131
1132 case SO_BROADCAST:
1133 v.val = sock_flag(sk, SOCK_BROADCAST);
1134 break;
1135
1136 case SO_SNDBUF:
1137 v.val = sk->sk_sndbuf;
1138 break;
1139
1140 case SO_RCVBUF:
1141 v.val = sk->sk_rcvbuf;
1142 break;
1143
1144 case SO_REUSEADDR:
1145 v.val = sk->sk_reuse;
1146 break;
1147
1148 case SO_REUSEPORT:
1149 v.val = sk->sk_reuseport;
1150 break;
1151
1152 case SO_KEEPALIVE:
1153 v.val = sock_flag(sk, SOCK_KEEPOPEN);
1154 break;
1155
1156 case SO_TYPE:
1157 v.val = sk->sk_type;
1158 break;
1159
1160 case SO_PROTOCOL:
1161 v.val = sk->sk_protocol;
1162 break;
1163
1164 case SO_DOMAIN:
1165 v.val = sk->sk_family;
1166 break;
1167
1168 case SO_ERROR:
1169 v.val = -sock_error(sk);
1170 if (v.val == 0)
1171 v.val = xchg(&sk->sk_err_soft, 0);
1172 break;
1173
1174 case SO_OOBINLINE:
1175 v.val = sock_flag(sk, SOCK_URGINLINE);
1176 break;
1177
1178 case SO_NO_CHECK:
1179 v.val = sk->sk_no_check_tx;
1180 break;
1181
1182 case SO_PRIORITY:
1183 v.val = sk->sk_priority;
1184 break;
1185
1186 case SO_LINGER:
1187 lv = sizeof(v.ling);
1188 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
1189 v.ling.l_linger = sk->sk_lingertime / HZ;
1190 break;
1191
1192 case SO_BSDCOMPAT:
1193 sock_warn_obsolete_bsdism("getsockopt");
1194 break;
1195
1196 case SO_TIMESTAMP:
1197 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1198 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1199 break;
1200
1201 case SO_TIMESTAMPNS:
1202 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
1203 break;
1204
1205 case SO_TIMESTAMPING:
1206 v.val = sk->sk_tsflags;
1207 break;
1208
1209 case SO_RCVTIMEO:
1210 lv = sizeof(struct timeval);
1211 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1212 v.tm.tv_sec = 0;
1213 v.tm.tv_usec = 0;
1214 } else {
1215 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1216 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * USEC_PER_SEC) / HZ;
1217 }
1218 break;
1219
1220 case SO_SNDTIMEO:
1221 lv = sizeof(struct timeval);
1222 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1223 v.tm.tv_sec = 0;
1224 v.tm.tv_usec = 0;
1225 } else {
1226 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1227 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * USEC_PER_SEC) / HZ;
1228 }
1229 break;
1230
1231 case SO_RCVLOWAT:
1232 v.val = sk->sk_rcvlowat;
1233 break;
1234
1235 case SO_SNDLOWAT:
1236 v.val = 1;
1237 break;
1238
1239 case SO_PASSCRED:
1240 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1241 break;
1242
1243 case SO_PEERCRED:
1244 {
1245 struct ucred peercred;
1246 if (len > sizeof(peercred))
1247 len = sizeof(peercred);
1248 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1249 if (copy_to_user(optval, &peercred, len))
1250 return -EFAULT;
1251 goto lenout;
1252 }
1253
1254 case SO_PEERGROUPS:
1255 {
1256 int ret, n;
1257
1258 if (!sk->sk_peer_cred)
1259 return -ENODATA;
1260
1261 n = sk->sk_peer_cred->group_info->ngroups;
1262 if (len < n * sizeof(gid_t)) {
1263 len = n * sizeof(gid_t);
1264 return put_user(len, optlen) ? -EFAULT : -ERANGE;
1265 }
1266 len = n * sizeof(gid_t);
1267
1268 ret = groups_to_user((gid_t __user *)optval,
1269 sk->sk_peer_cred->group_info);
1270 if (ret)
1271 return ret;
1272 goto lenout;
1273 }
1274
1275 case SO_PEERNAME:
1276 {
1277 char address[128];
1278
1279 lv = sock->ops->getname(sock, (struct sockaddr *)address, 2);
1280 if (lv < 0)
1281 return -ENOTCONN;
1282 if (lv < len)
1283 return -EINVAL;
1284 if (copy_to_user(optval, address, len))
1285 return -EFAULT;
1286 goto lenout;
1287 }
1288
1289 /* Dubious BSD thing... Probably nobody even uses it, but
1290 * the UNIX standard wants it for whatever reason... -DaveM
1291 */
1292 case SO_ACCEPTCONN:
1293 v.val = sk->sk_state == TCP_LISTEN;
1294 break;
1295
1296 case SO_PASSSEC:
1297 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1298 break;
1299
1300 case SO_PEERSEC:
1301 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1302
1303 case SO_MARK:
1304 v.val = sk->sk_mark;
1305 break;
1306
1307 case SO_RXQ_OVFL:
1308 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1309 break;
1310
1311 case SO_WIFI_STATUS:
1312 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1313 break;
1314
1315 case SO_PEEK_OFF:
1316 if (!sock->ops->set_peek_off)
1317 return -EOPNOTSUPP;
1318
1319 v.val = sk->sk_peek_off;
1320 break;
1321 case SO_NOFCS:
1322 v.val = sock_flag(sk, SOCK_NOFCS);
1323 break;
1324
1325 case SO_BINDTODEVICE:
1326 return sock_getbindtodevice(sk, optval, optlen, len);
1327
1328 case SO_GET_FILTER:
1329 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1330 if (len < 0)
1331 return len;
1332
1333 goto lenout;
1334
1335 case SO_LOCK_FILTER:
1336 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1337 break;
1338
1339 case SO_BPF_EXTENSIONS:
1340 v.val = bpf_tell_extensions();
1341 break;
1342
1343 case SO_SELECT_ERR_QUEUE:
1344 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1345 break;
1346
1347#ifdef CONFIG_NET_RX_BUSY_POLL
1348 case SO_BUSY_POLL:
1349 v.val = sk->sk_ll_usec;
1350 break;
1351#endif
1352
1353 case SO_MAX_PACING_RATE:
1354 v.val = sk->sk_max_pacing_rate;
1355 break;
1356
1357 case SO_INCOMING_CPU:
1358 v.val = sk->sk_incoming_cpu;
1359 break;
1360
1361 case SO_MEMINFO:
1362 {
1363 u32 meminfo[SK_MEMINFO_VARS];
1364
1365 if (get_user(len, optlen))
1366 return -EFAULT;
1367
1368 sk_get_meminfo(sk, meminfo);
1369
1370 len = min_t(unsigned int, len, sizeof(meminfo));
1371 if (copy_to_user(optval, &meminfo, len))
1372 return -EFAULT;
1373
1374 goto lenout;
1375 }
1376
1377#ifdef CONFIG_NET_RX_BUSY_POLL
1378 case SO_INCOMING_NAPI_ID:
1379 v.val = READ_ONCE(sk->sk_napi_id);
1380
1381 /* aggregate non-NAPI IDs down to 0 */
1382 if (v.val < MIN_NAPI_ID)
1383 v.val = 0;
1384
1385 break;
1386#endif
1387
1388 case SO_COOKIE:
1389 lv = sizeof(u64);
1390 if (len < lv)
1391 return -EINVAL;
1392 v.val64 = sock_gen_cookie(sk);
1393 break;
1394
1395 case SO_ZEROCOPY:
1396 v.val = sock_flag(sk, SOCK_ZEROCOPY);
1397 break;
1398
1399 default:
1400 /* We implement the SO_SNDLOWAT etc to not be settable
1401 * (1003.1g 7).
1402 */
1403 return -ENOPROTOOPT;
1404 }
1405
1406 if (len > lv)
1407 len = lv;
1408 if (copy_to_user(optval, &v, len))
1409 return -EFAULT;
1410lenout:
1411 if (put_user(len, optlen))
1412 return -EFAULT;
1413 return 0;
1414}
1415
1416/*
1417 * Initialize an sk_lock.
1418 *
1419 * (We also register the sk_lock with the lock validator.)
1420 */
1421static inline void sock_lock_init(struct sock *sk)
1422{
1423 if (sk->sk_kern_sock)
1424 sock_lock_init_class_and_name(
1425 sk,
1426 af_family_kern_slock_key_strings[sk->sk_family],
1427 af_family_kern_slock_keys + sk->sk_family,
1428 af_family_kern_key_strings[sk->sk_family],
1429 af_family_kern_keys + sk->sk_family);
1430 else
1431 sock_lock_init_class_and_name(
1432 sk,
1433 af_family_slock_key_strings[sk->sk_family],
1434 af_family_slock_keys + sk->sk_family,
1435 af_family_key_strings[sk->sk_family],
1436 af_family_keys + sk->sk_family);
1437}
1438
1439/*
1440 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1441 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1442 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1443 */
1444static void sock_copy(struct sock *nsk, const struct sock *osk)
1445{
1446#ifdef CONFIG_SECURITY_NETWORK
1447 void *sptr = nsk->sk_security;
1448#endif
1449 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1450
1451 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1452 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1453
1454#ifdef CONFIG_SECURITY_NETWORK
1455 nsk->sk_security = sptr;
1456 security_sk_clone(osk, nsk);
1457#endif
1458}
1459
1460static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1461 int family)
1462{
1463 struct sock *sk;
1464 struct kmem_cache *slab;
1465
1466 slab = prot->slab;
1467 if (slab != NULL) {
1468 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1469 if (!sk)
1470 return sk;
1471 if (priority & __GFP_ZERO)
1472 sk_prot_clear_nulls(sk, prot->obj_size);
1473 } else
1474 sk = kmalloc(prot->obj_size, priority);
1475
1476 if (sk != NULL) {
1477 if (security_sk_alloc(sk, family, priority))
1478 goto out_free;
1479
1480 if (!try_module_get(prot->owner))
1481 goto out_free_sec;
1482 sk_tx_queue_clear(sk);
1483 }
1484
1485 return sk;
1486
1487out_free_sec:
1488 security_sk_free(sk);
1489out_free:
1490 if (slab != NULL)
1491 kmem_cache_free(slab, sk);
1492 else
1493 kfree(sk);
1494 return NULL;
1495}
1496
1497static void sk_prot_free(struct proto *prot, struct sock *sk)
1498{
1499 struct kmem_cache *slab;
1500 struct module *owner;
1501
1502 owner = prot->owner;
1503 slab = prot->slab;
1504
1505 cgroup_sk_free(&sk->sk_cgrp_data);
1506 mem_cgroup_sk_free(sk);
1507 security_sk_free(sk);
1508 if (slab != NULL)
1509 kmem_cache_free(slab, sk);
1510 else
1511 kfree(sk);
1512 module_put(owner);
1513}
1514
1515/**
1516 * sk_alloc - All socket objects are allocated here
1517 * @net: the applicable net namespace
1518 * @family: protocol family
1519 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1520 * @prot: struct proto associated with this new sock instance
1521 * @kern: is this to be a kernel socket?
1522 */
1523struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1524 struct proto *prot, int kern)
1525{
1526 struct sock *sk;
1527
1528 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1529 if (sk) {
1530 sk->sk_family = family;
1531 /*
1532 * See comment in struct sock definition to understand
1533 * why we need sk_prot_creator -acme
1534 */
1535 sk->sk_prot = sk->sk_prot_creator = prot;
1536 sk->sk_kern_sock = kern;
1537 sock_lock_init(sk);
1538 sk->sk_net_refcnt = kern ? 0 : 1;
1539 if (likely(sk->sk_net_refcnt)) {
1540 get_net(net);
1541 sock_inuse_add(net, 1);
1542 }
1543
1544 sock_net_set(sk, net);
1545 refcount_set(&sk->sk_wmem_alloc, 1);
1546
1547 mem_cgroup_sk_alloc(sk);
1548 cgroup_sk_alloc(&sk->sk_cgrp_data);
1549 sock_update_classid(&sk->sk_cgrp_data);
1550 sock_update_netprioidx(&sk->sk_cgrp_data);
1551 }
1552
1553 return sk;
1554}
1555EXPORT_SYMBOL(sk_alloc);
1556
1557/* Sockets having SOCK_RCU_FREE will call this function after one RCU
1558 * grace period. This is the case for UDP sockets and TCP listeners.
1559 */
1560static void __sk_destruct(struct rcu_head *head)
1561{
1562 struct sock *sk = container_of(head, struct sock, sk_rcu);
1563 struct sk_filter *filter;
1564
1565 if (sk->sk_destruct)
1566 sk->sk_destruct(sk);
1567
1568 filter = rcu_dereference_check(sk->sk_filter,
1569 refcount_read(&sk->sk_wmem_alloc) == 0);
1570 if (filter) {
1571 sk_filter_uncharge(sk, filter);
1572 RCU_INIT_POINTER(sk->sk_filter, NULL);
1573 }
1574 if (rcu_access_pointer(sk->sk_reuseport_cb))
1575 reuseport_detach_sock(sk);
1576
1577 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1578
1579 if (atomic_read(&sk->sk_omem_alloc))
1580 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1581 __func__, atomic_read(&sk->sk_omem_alloc));
1582
1583 if (sk->sk_frag.page) {
1584 put_page(sk->sk_frag.page);
1585 sk->sk_frag.page = NULL;
1586 }
1587
1588 if (sk->sk_peer_cred)
1589 put_cred(sk->sk_peer_cred);
1590 put_pid(sk->sk_peer_pid);
1591 if (likely(sk->sk_net_refcnt))
1592 put_net(sock_net(sk));
1593 sk_prot_free(sk->sk_prot_creator, sk);
1594}
1595
1596void sk_destruct(struct sock *sk)
1597{
1598 if (sock_flag(sk, SOCK_RCU_FREE))
1599 call_rcu(&sk->sk_rcu, __sk_destruct);
1600 else
1601 __sk_destruct(&sk->sk_rcu);
1602}
1603
1604static void __sk_free(struct sock *sk)
1605{
1606 if (likely(sk->sk_net_refcnt))
1607 sock_inuse_add(sock_net(sk), -1);
1608
1609 if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk)))
1610 sock_diag_broadcast_destroy(sk);
1611 else
1612 sk_destruct(sk);
1613}
1614
1615void sk_free(struct sock *sk)
1616{
1617 /*
1618 * We subtract one from sk_wmem_alloc and can know if
1619 * some packets are still in some tx queue.
1620 * If not null, sock_wfree() will call __sk_free(sk) later
1621 */
1622 if (refcount_dec_and_test(&sk->sk_wmem_alloc))
1623 __sk_free(sk);
1624}
1625EXPORT_SYMBOL(sk_free);
1626
1627static void sk_init_common(struct sock *sk)
1628{
1629 skb_queue_head_init(&sk->sk_receive_queue);
1630 skb_queue_head_init(&sk->sk_write_queue);
1631 skb_queue_head_init(&sk->sk_error_queue);
1632
1633 rwlock_init(&sk->sk_callback_lock);
1634 lockdep_set_class_and_name(&sk->sk_receive_queue.lock,
1635 af_rlock_keys + sk->sk_family,
1636 af_family_rlock_key_strings[sk->sk_family]);
1637 lockdep_set_class_and_name(&sk->sk_write_queue.lock,
1638 af_wlock_keys + sk->sk_family,
1639 af_family_wlock_key_strings[sk->sk_family]);
1640 lockdep_set_class_and_name(&sk->sk_error_queue.lock,
1641 af_elock_keys + sk->sk_family,
1642 af_family_elock_key_strings[sk->sk_family]);
1643 lockdep_set_class_and_name(&sk->sk_callback_lock,
1644 af_callback_keys + sk->sk_family,
1645 af_family_clock_key_strings[sk->sk_family]);
1646}
1647
1648/**
1649 * sk_clone_lock - clone a socket, and lock its clone
1650 * @sk: the socket to clone
1651 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1652 *
1653 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1654 */
1655struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1656{
1657 struct sock *newsk;
1658 bool is_charged = true;
1659
1660 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1661 if (newsk != NULL) {
1662 struct sk_filter *filter;
1663
1664 sock_copy(newsk, sk);
1665
1666 newsk->sk_prot_creator = sk->sk_prot;
1667
1668 /* SANITY */
1669 if (likely(newsk->sk_net_refcnt))
1670 get_net(sock_net(newsk));
1671 sk_node_init(&newsk->sk_node);
1672 sock_lock_init(newsk);
1673 bh_lock_sock(newsk);
1674 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1675 newsk->sk_backlog.len = 0;
1676
1677 atomic_set(&newsk->sk_rmem_alloc, 0);
1678 /*
1679 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1680 */
1681 refcount_set(&newsk->sk_wmem_alloc, 1);
1682 atomic_set(&newsk->sk_omem_alloc, 0);
1683 sk_init_common(newsk);
1684
1685 newsk->sk_dst_cache = NULL;
1686 newsk->sk_dst_pending_confirm = 0;
1687 newsk->sk_wmem_queued = 0;
1688 newsk->sk_forward_alloc = 0;
1689 atomic_set(&newsk->sk_drops, 0);
1690 newsk->sk_send_head = NULL;
1691 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1692 atomic_set(&newsk->sk_zckey, 0);
1693
1694 sock_reset_flag(newsk, SOCK_DONE);
1695 mem_cgroup_sk_alloc(newsk);
1696 cgroup_sk_alloc(&newsk->sk_cgrp_data);
1697
1698 rcu_read_lock();
1699 filter = rcu_dereference(sk->sk_filter);
1700 if (filter != NULL)
1701 /* though it's an empty new sock, the charging may fail
1702 * if sysctl_optmem_max was changed between creation of
1703 * original socket and cloning
1704 */
1705 is_charged = sk_filter_charge(newsk, filter);
1706 RCU_INIT_POINTER(newsk->sk_filter, filter);
1707 rcu_read_unlock();
1708
1709 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
1710 /* We need to make sure that we don't uncharge the new
1711 * socket if we couldn't charge it in the first place
1712 * as otherwise we uncharge the parent's filter.
1713 */
1714 if (!is_charged)
1715 RCU_INIT_POINTER(newsk->sk_filter, NULL);
1716 sk_free_unlock_clone(newsk);
1717 newsk = NULL;
1718 goto out;
1719 }
1720 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
1721
1722 newsk->sk_err = 0;
1723 newsk->sk_err_soft = 0;
1724 newsk->sk_priority = 0;
1725 newsk->sk_incoming_cpu = raw_smp_processor_id();
1726 atomic64_set(&newsk->sk_cookie, 0);
1727 if (likely(newsk->sk_net_refcnt))
1728 sock_inuse_add(sock_net(newsk), 1);
1729
1730 /*
1731 * Before updating sk_refcnt, we must commit prior changes to memory
1732 * (Documentation/RCU/rculist_nulls.txt for details)
1733 */
1734 smp_wmb();
1735 refcount_set(&newsk->sk_refcnt, 2);
1736
1737 /*
1738 * Increment the counter in the same struct proto as the master
1739 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1740 * is the same as sk->sk_prot->socks, as this field was copied
1741 * with memcpy).
1742 *
1743 * This _changes_ the previous behaviour, where
1744 * tcp_create_openreq_child always was incrementing the
1745 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1746 * to be taken into account in all callers. -acme
1747 */
1748 sk_refcnt_debug_inc(newsk);
1749 sk_set_socket(newsk, NULL);
1750 newsk->sk_wq = NULL;
1751
1752 if (newsk->sk_prot->sockets_allocated)
1753 sk_sockets_allocated_inc(newsk);
1754
1755 if (sock_needs_netstamp(sk) &&
1756 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1757 net_enable_timestamp();
1758 }
1759out:
1760 return newsk;
1761}
1762EXPORT_SYMBOL_GPL(sk_clone_lock);
1763
1764void sk_free_unlock_clone(struct sock *sk)
1765{
1766 /* It is still raw copy of parent, so invalidate
1767 * destructor and make plain sk_free() */
1768 sk->sk_destruct = NULL;
1769 bh_unlock_sock(sk);
1770 sk_free(sk);
1771}
1772EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
1773
1774void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1775{
1776 u32 max_segs = 1;
1777
1778 sk_dst_set(sk, dst);
1779 sk->sk_route_caps = dst->dev->features | sk->sk_route_forced_caps;
1780 if (sk->sk_route_caps & NETIF_F_GSO)
1781 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1782 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1783 if (sk_can_gso(sk)) {
1784 if (dst->header_len && !xfrm_dst_offload_ok(dst)) {
1785 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1786 } else {
1787 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1788 sk->sk_gso_max_size = dst->dev->gso_max_size;
1789 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
1790 }
1791 }
1792 sk->sk_gso_max_segs = max_segs;
1793}
1794EXPORT_SYMBOL_GPL(sk_setup_caps);
1795
1796/*
1797 * Simple resource managers for sockets.
1798 */
1799
1800
1801/*
1802 * Write buffer destructor automatically called from kfree_skb.
1803 */
1804void sock_wfree(struct sk_buff *skb)
1805{
1806 struct sock *sk = skb->sk;
1807 unsigned int len = skb->truesize;
1808
1809 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1810 /*
1811 * Keep a reference on sk_wmem_alloc, this will be released
1812 * after sk_write_space() call
1813 */
1814 WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc));
1815 sk->sk_write_space(sk);
1816 len = 1;
1817 }
1818 /*
1819 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1820 * could not do because of in-flight packets
1821 */
1822 if (refcount_sub_and_test(len, &sk->sk_wmem_alloc))
1823 __sk_free(sk);
1824}
1825EXPORT_SYMBOL(sock_wfree);
1826
1827/* This variant of sock_wfree() is used by TCP,
1828 * since it sets SOCK_USE_WRITE_QUEUE.
1829 */
1830void __sock_wfree(struct sk_buff *skb)
1831{
1832 struct sock *sk = skb->sk;
1833
1834 if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
1835 __sk_free(sk);
1836}
1837
1838void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1839{
1840 skb_orphan(skb);
1841 skb->sk = sk;
1842#ifdef CONFIG_INET
1843 if (unlikely(!sk_fullsock(sk))) {
1844 skb->destructor = sock_edemux;
1845 sock_hold(sk);
1846 return;
1847 }
1848#endif
1849 skb->destructor = sock_wfree;
1850 skb_set_hash_from_sk(skb, sk);
1851 /*
1852 * We used to take a refcount on sk, but following operation
1853 * is enough to guarantee sk_free() wont free this sock until
1854 * all in-flight packets are completed
1855 */
1856 refcount_add(skb->truesize, &sk->sk_wmem_alloc);
1857}
1858EXPORT_SYMBOL(skb_set_owner_w);
1859
1860/* This helper is used by netem, as it can hold packets in its
1861 * delay queue. We want to allow the owner socket to send more
1862 * packets, as if they were already TX completed by a typical driver.
1863 * But we also want to keep skb->sk set because some packet schedulers
1864 * rely on it (sch_fq for example).
1865 */
1866void skb_orphan_partial(struct sk_buff *skb)
1867{
1868 if (skb_is_tcp_pure_ack(skb))
1869 return;
1870
1871 if (skb->destructor == sock_wfree
1872#ifdef CONFIG_INET
1873 || skb->destructor == tcp_wfree
1874#endif
1875 ) {
1876 struct sock *sk = skb->sk;
1877
1878 if (refcount_inc_not_zero(&sk->sk_refcnt)) {
1879 WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc));
1880 skb->destructor = sock_efree;
1881 }
1882 } else {
1883 skb_orphan(skb);
1884 }
1885}
1886EXPORT_SYMBOL(skb_orphan_partial);
1887
1888/*
1889 * Read buffer destructor automatically called from kfree_skb.
1890 */
1891void sock_rfree(struct sk_buff *skb)
1892{
1893 struct sock *sk = skb->sk;
1894 unsigned int len = skb->truesize;
1895
1896 atomic_sub(len, &sk->sk_rmem_alloc);
1897 sk_mem_uncharge(sk, len);
1898}
1899EXPORT_SYMBOL(sock_rfree);
1900
1901/*
1902 * Buffer destructor for skbs that are not used directly in read or write
1903 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1904 */
1905void sock_efree(struct sk_buff *skb)
1906{
1907 sock_put(skb->sk);
1908}
1909EXPORT_SYMBOL(sock_efree);
1910
1911kuid_t sock_i_uid(struct sock *sk)
1912{
1913 kuid_t uid;
1914
1915 read_lock_bh(&sk->sk_callback_lock);
1916 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
1917 read_unlock_bh(&sk->sk_callback_lock);
1918 return uid;
1919}
1920EXPORT_SYMBOL(sock_i_uid);
1921
1922unsigned long sock_i_ino(struct sock *sk)
1923{
1924 unsigned long ino;
1925
1926 read_lock_bh(&sk->sk_callback_lock);
1927 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1928 read_unlock_bh(&sk->sk_callback_lock);
1929 return ino;
1930}
1931EXPORT_SYMBOL(sock_i_ino);
1932
1933/*
1934 * Allocate a skb from the socket's send buffer.
1935 */
1936struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1937 gfp_t priority)
1938{
1939 if (force || refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1940 struct sk_buff *skb = alloc_skb(size, priority);
1941 if (skb) {
1942 skb_set_owner_w(skb, sk);
1943 return skb;
1944 }
1945 }
1946 return NULL;
1947}
1948EXPORT_SYMBOL(sock_wmalloc);
1949
1950static void sock_ofree(struct sk_buff *skb)
1951{
1952 struct sock *sk = skb->sk;
1953
1954 atomic_sub(skb->truesize, &sk->sk_omem_alloc);
1955}
1956
1957struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size,
1958 gfp_t priority)
1959{
1960 struct sk_buff *skb;
1961
1962 /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */
1963 if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) >
1964 sysctl_optmem_max)
1965 return NULL;
1966
1967 skb = alloc_skb(size, priority);
1968 if (!skb)
1969 return NULL;
1970
1971 atomic_add(skb->truesize, &sk->sk_omem_alloc);
1972 skb->sk = sk;
1973 skb->destructor = sock_ofree;
1974 return skb;
1975}
1976
1977/*
1978 * Allocate a memory block from the socket's option memory buffer.
1979 */
1980void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1981{
1982 if ((unsigned int)size <= sysctl_optmem_max &&
1983 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1984 void *mem;
1985 /* First do the add, to avoid the race if kmalloc
1986 * might sleep.
1987 */
1988 atomic_add(size, &sk->sk_omem_alloc);
1989 mem = kmalloc(size, priority);
1990 if (mem)
1991 return mem;
1992 atomic_sub(size, &sk->sk_omem_alloc);
1993 }
1994 return NULL;
1995}
1996EXPORT_SYMBOL(sock_kmalloc);
1997
1998/* Free an option memory block. Note, we actually want the inline
1999 * here as this allows gcc to detect the nullify and fold away the
2000 * condition entirely.
2001 */
2002static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
2003 const bool nullify)
2004{
2005 if (WARN_ON_ONCE(!mem))
2006 return;
2007 if (nullify)
2008 kzfree(mem);
2009 else
2010 kfree(mem);
2011 atomic_sub(size, &sk->sk_omem_alloc);
2012}
2013
2014void sock_kfree_s(struct sock *sk, void *mem, int size)
2015{
2016 __sock_kfree_s(sk, mem, size, false);
2017}
2018EXPORT_SYMBOL(sock_kfree_s);
2019
2020void sock_kzfree_s(struct sock *sk, void *mem, int size)
2021{
2022 __sock_kfree_s(sk, mem, size, true);
2023}
2024EXPORT_SYMBOL(sock_kzfree_s);
2025
2026/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
2027 I think, these locks should be removed for datagram sockets.
2028 */
2029static long sock_wait_for_wmem(struct sock *sk, long timeo)
2030{
2031 DEFINE_WAIT(wait);
2032
2033 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2034 for (;;) {
2035 if (!timeo)
2036 break;
2037 if (signal_pending(current))
2038 break;
2039 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2040 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2041 if (refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
2042 break;
2043 if (sk->sk_shutdown & SEND_SHUTDOWN)
2044 break;
2045 if (sk->sk_err)
2046 break;
2047 timeo = schedule_timeout(timeo);
2048 }
2049 finish_wait(sk_sleep(sk), &wait);
2050 return timeo;
2051}
2052
2053
2054/*
2055 * Generic send/receive buffer handlers
2056 */
2057
2058struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
2059 unsigned long data_len, int noblock,
2060 int *errcode, int max_page_order)
2061{
2062 struct sk_buff *skb;
2063 long timeo;
2064 int err;
2065
2066 timeo = sock_sndtimeo(sk, noblock);
2067 for (;;) {
2068 err = sock_error(sk);
2069 if (err != 0)
2070 goto failure;
2071
2072 err = -EPIPE;
2073 if (sk->sk_shutdown & SEND_SHUTDOWN)
2074 goto failure;
2075
2076 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
2077 break;
2078
2079 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2080 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2081 err = -EAGAIN;
2082 if (!timeo)
2083 goto failure;
2084 if (signal_pending(current))
2085 goto interrupted;
2086 timeo = sock_wait_for_wmem(sk, timeo);
2087 }
2088 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
2089 errcode, sk->sk_allocation);
2090 if (skb)
2091 skb_set_owner_w(skb, sk);
2092 return skb;
2093
2094interrupted:
2095 err = sock_intr_errno(timeo);
2096failure:
2097 *errcode = err;
2098 return NULL;
2099}
2100EXPORT_SYMBOL(sock_alloc_send_pskb);
2101
2102struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
2103 int noblock, int *errcode)
2104{
2105 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
2106}
2107EXPORT_SYMBOL(sock_alloc_send_skb);
2108
2109int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
2110 struct sockcm_cookie *sockc)
2111{
2112 u32 tsflags;
2113
2114 switch (cmsg->cmsg_type) {
2115 case SO_MARK:
2116 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2117 return -EPERM;
2118 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2119 return -EINVAL;
2120 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
2121 break;
2122 case SO_TIMESTAMPING:
2123 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2124 return -EINVAL;
2125
2126 tsflags = *(u32 *)CMSG_DATA(cmsg);
2127 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
2128 return -EINVAL;
2129
2130 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
2131 sockc->tsflags |= tsflags;
2132 break;
2133 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
2134 case SCM_RIGHTS:
2135 case SCM_CREDENTIALS:
2136 break;
2137 default:
2138 return -EINVAL;
2139 }
2140 return 0;
2141}
2142EXPORT_SYMBOL(__sock_cmsg_send);
2143
2144int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
2145 struct sockcm_cookie *sockc)
2146{
2147 struct cmsghdr *cmsg;
2148 int ret;
2149
2150 for_each_cmsghdr(cmsg, msg) {
2151 if (!CMSG_OK(msg, cmsg))
2152 return -EINVAL;
2153 if (cmsg->cmsg_level != SOL_SOCKET)
2154 continue;
2155 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
2156 if (ret)
2157 return ret;
2158 }
2159 return 0;
2160}
2161EXPORT_SYMBOL(sock_cmsg_send);
2162
2163static void sk_enter_memory_pressure(struct sock *sk)
2164{
2165 if (!sk->sk_prot->enter_memory_pressure)
2166 return;
2167
2168 sk->sk_prot->enter_memory_pressure(sk);
2169}
2170
2171static void sk_leave_memory_pressure(struct sock *sk)
2172{
2173 if (sk->sk_prot->leave_memory_pressure) {
2174 sk->sk_prot->leave_memory_pressure(sk);
2175 } else {
2176 unsigned long *memory_pressure = sk->sk_prot->memory_pressure;
2177
2178 if (memory_pressure && *memory_pressure)
2179 *memory_pressure = 0;
2180 }
2181}
2182
2183/* On 32bit arches, an skb frag is limited to 2^15 */
2184#define SKB_FRAG_PAGE_ORDER get_order(32768)
2185
2186/**
2187 * skb_page_frag_refill - check that a page_frag contains enough room
2188 * @sz: minimum size of the fragment we want to get
2189 * @pfrag: pointer to page_frag
2190 * @gfp: priority for memory allocation
2191 *
2192 * Note: While this allocator tries to use high order pages, there is
2193 * no guarantee that allocations succeed. Therefore, @sz MUST be
2194 * less or equal than PAGE_SIZE.
2195 */
2196bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
2197{
2198 if (pfrag->page) {
2199 if (page_ref_count(pfrag->page) == 1) {
2200 pfrag->offset = 0;
2201 return true;
2202 }
2203 if (pfrag->offset + sz <= pfrag->size)
2204 return true;
2205 put_page(pfrag->page);
2206 }
2207
2208 pfrag->offset = 0;
2209 if (SKB_FRAG_PAGE_ORDER) {
2210 /* Avoid direct reclaim but allow kswapd to wake */
2211 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
2212 __GFP_COMP | __GFP_NOWARN |
2213 __GFP_NORETRY,
2214 SKB_FRAG_PAGE_ORDER);
2215 if (likely(pfrag->page)) {
2216 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
2217 return true;
2218 }
2219 }
2220 pfrag->page = alloc_page(gfp);
2221 if (likely(pfrag->page)) {
2222 pfrag->size = PAGE_SIZE;
2223 return true;
2224 }
2225 return false;
2226}
2227EXPORT_SYMBOL(skb_page_frag_refill);
2228
2229bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2230{
2231 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2232 return true;
2233
2234 sk_enter_memory_pressure(sk);
2235 sk_stream_moderate_sndbuf(sk);
2236 return false;
2237}
2238EXPORT_SYMBOL(sk_page_frag_refill);
2239
2240int sk_alloc_sg(struct sock *sk, int len, struct scatterlist *sg,
2241 int sg_start, int *sg_curr_index, unsigned int *sg_curr_size,
2242 int first_coalesce)
2243{
2244 int sg_curr = *sg_curr_index, use = 0, rc = 0;
2245 unsigned int size = *sg_curr_size;
2246 struct page_frag *pfrag;
2247 struct scatterlist *sge;
2248
2249 len -= size;
2250 pfrag = sk_page_frag(sk);
2251
2252 while (len > 0) {
2253 unsigned int orig_offset;
2254
2255 if (!sk_page_frag_refill(sk, pfrag)) {
2256 rc = -ENOMEM;
2257 goto out;
2258 }
2259
2260 use = min_t(int, len, pfrag->size - pfrag->offset);
2261
2262 if (!sk_wmem_schedule(sk, use)) {
2263 rc = -ENOMEM;
2264 goto out;
2265 }
2266
2267 sk_mem_charge(sk, use);
2268 size += use;
2269 orig_offset = pfrag->offset;
2270 pfrag->offset += use;
2271
2272 sge = sg + sg_curr - 1;
2273 if (sg_curr > first_coalesce && sg_page(sg) == pfrag->page &&
2274 sg->offset + sg->length == orig_offset) {
2275 sg->length += use;
2276 } else {
2277 sge = sg + sg_curr;
2278 sg_unmark_end(sge);
2279 sg_set_page(sge, pfrag->page, use, orig_offset);
2280 get_page(pfrag->page);
2281 sg_curr++;
2282
2283 if (sg_curr == MAX_SKB_FRAGS)
2284 sg_curr = 0;
2285
2286 if (sg_curr == sg_start) {
2287 rc = -ENOSPC;
2288 break;
2289 }
2290 }
2291
2292 len -= use;
2293 }
2294out:
2295 *sg_curr_size = size;
2296 *sg_curr_index = sg_curr;
2297 return rc;
2298}
2299EXPORT_SYMBOL(sk_alloc_sg);
2300
2301static void __lock_sock(struct sock *sk)
2302 __releases(&sk->sk_lock.slock)
2303 __acquires(&sk->sk_lock.slock)
2304{
2305 DEFINE_WAIT(wait);
2306
2307 for (;;) {
2308 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2309 TASK_UNINTERRUPTIBLE);
2310 spin_unlock_bh(&sk->sk_lock.slock);
2311 schedule();
2312 spin_lock_bh(&sk->sk_lock.slock);
2313 if (!sock_owned_by_user(sk))
2314 break;
2315 }
2316 finish_wait(&sk->sk_lock.wq, &wait);
2317}
2318
2319static void __release_sock(struct sock *sk)
2320 __releases(&sk->sk_lock.slock)
2321 __acquires(&sk->sk_lock.slock)
2322{
2323 struct sk_buff *skb, *next;
2324
2325 while ((skb = sk->sk_backlog.head) != NULL) {
2326 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
2327
2328 spin_unlock_bh(&sk->sk_lock.slock);
2329
2330 do {
2331 next = skb->next;
2332 prefetch(next);
2333 WARN_ON_ONCE(skb_dst_is_noref(skb));
2334 skb->next = NULL;
2335 sk_backlog_rcv(sk, skb);
2336
2337 cond_resched();
2338
2339 skb = next;
2340 } while (skb != NULL);
2341
2342 spin_lock_bh(&sk->sk_lock.slock);
2343 }
2344
2345 /*
2346 * Doing the zeroing here guarantee we can not loop forever
2347 * while a wild producer attempts to flood us.
2348 */
2349 sk->sk_backlog.len = 0;
2350}
2351
2352void __sk_flush_backlog(struct sock *sk)
2353{
2354 spin_lock_bh(&sk->sk_lock.slock);
2355 __release_sock(sk);
2356 spin_unlock_bh(&sk->sk_lock.slock);
2357}
2358
2359/**
2360 * sk_wait_data - wait for data to arrive at sk_receive_queue
2361 * @sk: sock to wait on
2362 * @timeo: for how long
2363 * @skb: last skb seen on sk_receive_queue
2364 *
2365 * Now socket state including sk->sk_err is changed only under lock,
2366 * hence we may omit checks after joining wait queue.
2367 * We check receive queue before schedule() only as optimization;
2368 * it is very likely that release_sock() added new data.
2369 */
2370int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
2371{
2372 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2373 int rc;
2374
2375 add_wait_queue(sk_sleep(sk), &wait);
2376 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2377 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
2378 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2379 remove_wait_queue(sk_sleep(sk), &wait);
2380 return rc;
2381}
2382EXPORT_SYMBOL(sk_wait_data);
2383
2384/**
2385 * __sk_mem_raise_allocated - increase memory_allocated
2386 * @sk: socket
2387 * @size: memory size to allocate
2388 * @amt: pages to allocate
2389 * @kind: allocation type
2390 *
2391 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc
2392 */
2393int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
2394{
2395 struct proto *prot = sk->sk_prot;
2396 long allocated = sk_memory_allocated_add(sk, amt);
2397
2398 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2399 !mem_cgroup_charge_skmem(sk->sk_memcg, amt))
2400 goto suppress_allocation;
2401
2402 /* Under limit. */
2403 if (allocated <= sk_prot_mem_limits(sk, 0)) {
2404 sk_leave_memory_pressure(sk);
2405 return 1;
2406 }
2407
2408 /* Under pressure. */
2409 if (allocated > sk_prot_mem_limits(sk, 1))
2410 sk_enter_memory_pressure(sk);
2411
2412 /* Over hard limit. */
2413 if (allocated > sk_prot_mem_limits(sk, 2))
2414 goto suppress_allocation;
2415
2416 /* guarantee minimum buffer size under pressure */
2417 if (kind == SK_MEM_RECV) {
2418 if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot))
2419 return 1;
2420
2421 } else { /* SK_MEM_SEND */
2422 int wmem0 = sk_get_wmem0(sk, prot);
2423
2424 if (sk->sk_type == SOCK_STREAM) {
2425 if (sk->sk_wmem_queued < wmem0)
2426 return 1;
2427 } else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) {
2428 return 1;
2429 }
2430 }
2431
2432 if (sk_has_memory_pressure(sk)) {
2433 int alloc;
2434
2435 if (!sk_under_memory_pressure(sk))
2436 return 1;
2437 alloc = sk_sockets_allocated_read_positive(sk);
2438 if (sk_prot_mem_limits(sk, 2) > alloc *
2439 sk_mem_pages(sk->sk_wmem_queued +
2440 atomic_read(&sk->sk_rmem_alloc) +
2441 sk->sk_forward_alloc))
2442 return 1;
2443 }
2444
2445suppress_allocation:
2446
2447 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2448 sk_stream_moderate_sndbuf(sk);
2449
2450 /* Fail only if socket is _under_ its sndbuf.
2451 * In this case we cannot block, so that we have to fail.
2452 */
2453 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2454 return 1;
2455 }
2456
2457 trace_sock_exceed_buf_limit(sk, prot, allocated);
2458
2459 sk_memory_allocated_sub(sk, amt);
2460
2461 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2462 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
2463
2464 return 0;
2465}
2466EXPORT_SYMBOL(__sk_mem_raise_allocated);
2467
2468/**
2469 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2470 * @sk: socket
2471 * @size: memory size to allocate
2472 * @kind: allocation type
2473 *
2474 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2475 * rmem allocation. This function assumes that protocols which have
2476 * memory_pressure use sk_wmem_queued as write buffer accounting.
2477 */
2478int __sk_mem_schedule(struct sock *sk, int size, int kind)
2479{
2480 int ret, amt = sk_mem_pages(size);
2481
2482 sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT;
2483 ret = __sk_mem_raise_allocated(sk, size, amt, kind);
2484 if (!ret)
2485 sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT;
2486 return ret;
2487}
2488EXPORT_SYMBOL(__sk_mem_schedule);
2489
2490/**
2491 * __sk_mem_reduce_allocated - reclaim memory_allocated
2492 * @sk: socket
2493 * @amount: number of quanta
2494 *
2495 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
2496 */
2497void __sk_mem_reduce_allocated(struct sock *sk, int amount)
2498{
2499 sk_memory_allocated_sub(sk, amount);
2500
2501 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2502 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
2503
2504 if (sk_under_memory_pressure(sk) &&
2505 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2506 sk_leave_memory_pressure(sk);
2507}
2508EXPORT_SYMBOL(__sk_mem_reduce_allocated);
2509
2510/**
2511 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
2512 * @sk: socket
2513 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
2514 */
2515void __sk_mem_reclaim(struct sock *sk, int amount)
2516{
2517 amount >>= SK_MEM_QUANTUM_SHIFT;
2518 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
2519 __sk_mem_reduce_allocated(sk, amount);
2520}
2521EXPORT_SYMBOL(__sk_mem_reclaim);
2522
2523int sk_set_peek_off(struct sock *sk, int val)
2524{
2525 sk->sk_peek_off = val;
2526 return 0;
2527}
2528EXPORT_SYMBOL_GPL(sk_set_peek_off);
2529
2530/*
2531 * Set of default routines for initialising struct proto_ops when
2532 * the protocol does not support a particular function. In certain
2533 * cases where it makes no sense for a protocol to have a "do nothing"
2534 * function, some default processing is provided.
2535 */
2536
2537int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2538{
2539 return -EOPNOTSUPP;
2540}
2541EXPORT_SYMBOL(sock_no_bind);
2542
2543int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
2544 int len, int flags)
2545{
2546 return -EOPNOTSUPP;
2547}
2548EXPORT_SYMBOL(sock_no_connect);
2549
2550int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2551{
2552 return -EOPNOTSUPP;
2553}
2554EXPORT_SYMBOL(sock_no_socketpair);
2555
2556int sock_no_accept(struct socket *sock, struct socket *newsock, int flags,
2557 bool kern)
2558{
2559 return -EOPNOTSUPP;
2560}
2561EXPORT_SYMBOL(sock_no_accept);
2562
2563int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
2564 int peer)
2565{
2566 return -EOPNOTSUPP;
2567}
2568EXPORT_SYMBOL(sock_no_getname);
2569
2570__poll_t sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
2571{
2572 return 0;
2573}
2574EXPORT_SYMBOL(sock_no_poll);
2575
2576int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2577{
2578 return -EOPNOTSUPP;
2579}
2580EXPORT_SYMBOL(sock_no_ioctl);
2581
2582int sock_no_listen(struct socket *sock, int backlog)
2583{
2584 return -EOPNOTSUPP;
2585}
2586EXPORT_SYMBOL(sock_no_listen);
2587
2588int sock_no_shutdown(struct socket *sock, int how)
2589{
2590 return -EOPNOTSUPP;
2591}
2592EXPORT_SYMBOL(sock_no_shutdown);
2593
2594int sock_no_setsockopt(struct socket *sock, int level, int optname,
2595 char __user *optval, unsigned int optlen)
2596{
2597 return -EOPNOTSUPP;
2598}
2599EXPORT_SYMBOL(sock_no_setsockopt);
2600
2601int sock_no_getsockopt(struct socket *sock, int level, int optname,
2602 char __user *optval, int __user *optlen)
2603{
2604 return -EOPNOTSUPP;
2605}
2606EXPORT_SYMBOL(sock_no_getsockopt);
2607
2608int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
2609{
2610 return -EOPNOTSUPP;
2611}
2612EXPORT_SYMBOL(sock_no_sendmsg);
2613
2614int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len)
2615{
2616 return -EOPNOTSUPP;
2617}
2618EXPORT_SYMBOL(sock_no_sendmsg_locked);
2619
2620int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2621 int flags)
2622{
2623 return -EOPNOTSUPP;
2624}
2625EXPORT_SYMBOL(sock_no_recvmsg);
2626
2627int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2628{
2629 /* Mirror missing mmap method error code */
2630 return -ENODEV;
2631}
2632EXPORT_SYMBOL(sock_no_mmap);
2633
2634ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2635{
2636 ssize_t res;
2637 struct msghdr msg = {.msg_flags = flags};
2638 struct kvec iov;
2639 char *kaddr = kmap(page);
2640 iov.iov_base = kaddr + offset;
2641 iov.iov_len = size;
2642 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2643 kunmap(page);
2644 return res;
2645}
2646EXPORT_SYMBOL(sock_no_sendpage);
2647
2648ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page,
2649 int offset, size_t size, int flags)
2650{
2651 ssize_t res;
2652 struct msghdr msg = {.msg_flags = flags};
2653 struct kvec iov;
2654 char *kaddr = kmap(page);
2655
2656 iov.iov_base = kaddr + offset;
2657 iov.iov_len = size;
2658 res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size);
2659 kunmap(page);
2660 return res;
2661}
2662EXPORT_SYMBOL(sock_no_sendpage_locked);
2663
2664/*
2665 * Default Socket Callbacks
2666 */
2667
2668static void sock_def_wakeup(struct sock *sk)
2669{
2670 struct socket_wq *wq;
2671
2672 rcu_read_lock();
2673 wq = rcu_dereference(sk->sk_wq);
2674 if (skwq_has_sleeper(wq))
2675 wake_up_interruptible_all(&wq->wait);
2676 rcu_read_unlock();
2677}
2678
2679static void sock_def_error_report(struct sock *sk)
2680{
2681 struct socket_wq *wq;
2682
2683 rcu_read_lock();
2684 wq = rcu_dereference(sk->sk_wq);
2685 if (skwq_has_sleeper(wq))
2686 wake_up_interruptible_poll(&wq->wait, EPOLLERR);
2687 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2688 rcu_read_unlock();
2689}
2690
2691static void sock_def_readable(struct sock *sk)
2692{
2693 struct socket_wq *wq;
2694
2695 rcu_read_lock();
2696 wq = rcu_dereference(sk->sk_wq);
2697 if (skwq_has_sleeper(wq))
2698 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
2699 EPOLLRDNORM | EPOLLRDBAND);
2700 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2701 rcu_read_unlock();
2702}
2703
2704static void sock_def_write_space(struct sock *sk)
2705{
2706 struct socket_wq *wq;
2707
2708 rcu_read_lock();
2709
2710 /* Do not wake up a writer until he can make "significant"
2711 * progress. --DaveM
2712 */
2713 if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
2714 wq = rcu_dereference(sk->sk_wq);
2715 if (skwq_has_sleeper(wq))
2716 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2717 EPOLLWRNORM | EPOLLWRBAND);
2718
2719 /* Should agree with poll, otherwise some programs break */
2720 if (sock_writeable(sk))
2721 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2722 }
2723
2724 rcu_read_unlock();
2725}
2726
2727static void sock_def_destruct(struct sock *sk)
2728{
2729}
2730
2731void sk_send_sigurg(struct sock *sk)
2732{
2733 if (sk->sk_socket && sk->sk_socket->file)
2734 if (send_sigurg(&sk->sk_socket->file->f_owner))
2735 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2736}
2737EXPORT_SYMBOL(sk_send_sigurg);
2738
2739void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2740 unsigned long expires)
2741{
2742 if (!mod_timer(timer, expires))
2743 sock_hold(sk);
2744}
2745EXPORT_SYMBOL(sk_reset_timer);
2746
2747void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2748{
2749 if (del_timer(timer))
2750 __sock_put(sk);
2751}
2752EXPORT_SYMBOL(sk_stop_timer);
2753
2754void sock_init_data(struct socket *sock, struct sock *sk)
2755{
2756 sk_init_common(sk);
2757 sk->sk_send_head = NULL;
2758
2759 timer_setup(&sk->sk_timer, NULL, 0);
2760
2761 sk->sk_allocation = GFP_KERNEL;
2762 sk->sk_rcvbuf = sysctl_rmem_default;
2763 sk->sk_sndbuf = sysctl_wmem_default;
2764 sk->sk_state = TCP_CLOSE;
2765 sk_set_socket(sk, sock);
2766
2767 sock_set_flag(sk, SOCK_ZAPPED);
2768
2769 if (sock) {
2770 sk->sk_type = sock->type;
2771 sk->sk_wq = sock->wq;
2772 sock->sk = sk;
2773 sk->sk_uid = SOCK_INODE(sock)->i_uid;
2774 } else {
2775 sk->sk_wq = NULL;
2776 sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0);
2777 }
2778
2779 rwlock_init(&sk->sk_callback_lock);
2780 if (sk->sk_kern_sock)
2781 lockdep_set_class_and_name(
2782 &sk->sk_callback_lock,
2783 af_kern_callback_keys + sk->sk_family,
2784 af_family_kern_clock_key_strings[sk->sk_family]);
2785 else
2786 lockdep_set_class_and_name(
2787 &sk->sk_callback_lock,
2788 af_callback_keys + sk->sk_family,
2789 af_family_clock_key_strings[sk->sk_family]);
2790
2791 sk->sk_state_change = sock_def_wakeup;
2792 sk->sk_data_ready = sock_def_readable;
2793 sk->sk_write_space = sock_def_write_space;
2794 sk->sk_error_report = sock_def_error_report;
2795 sk->sk_destruct = sock_def_destruct;
2796
2797 sk->sk_frag.page = NULL;
2798 sk->sk_frag.offset = 0;
2799 sk->sk_peek_off = -1;
2800
2801 sk->sk_peer_pid = NULL;
2802 sk->sk_peer_cred = NULL;
2803 sk->sk_write_pending = 0;
2804 sk->sk_rcvlowat = 1;
2805 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2806 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2807
2808 sk->sk_stamp = SK_DEFAULT_STAMP;
2809 atomic_set(&sk->sk_zckey, 0);
2810
2811#ifdef CONFIG_NET_RX_BUSY_POLL
2812 sk->sk_napi_id = 0;
2813 sk->sk_ll_usec = sysctl_net_busy_read;
2814#endif
2815
2816 sk->sk_max_pacing_rate = ~0U;
2817 sk->sk_pacing_rate = ~0U;
2818 sk->sk_pacing_shift = 10;
2819 sk->sk_incoming_cpu = -1;
2820 /*
2821 * Before updating sk_refcnt, we must commit prior changes to memory
2822 * (Documentation/RCU/rculist_nulls.txt for details)
2823 */
2824 smp_wmb();
2825 refcount_set(&sk->sk_refcnt, 1);
2826 atomic_set(&sk->sk_drops, 0);
2827}
2828EXPORT_SYMBOL(sock_init_data);
2829
2830void lock_sock_nested(struct sock *sk, int subclass)
2831{
2832 might_sleep();
2833 spin_lock_bh(&sk->sk_lock.slock);
2834 if (sk->sk_lock.owned)
2835 __lock_sock(sk);
2836 sk->sk_lock.owned = 1;
2837 spin_unlock(&sk->sk_lock.slock);
2838 /*
2839 * The sk_lock has mutex_lock() semantics here:
2840 */
2841 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2842 local_bh_enable();
2843}
2844EXPORT_SYMBOL(lock_sock_nested);
2845
2846void release_sock(struct sock *sk)
2847{
2848 spin_lock_bh(&sk->sk_lock.slock);
2849 if (sk->sk_backlog.tail)
2850 __release_sock(sk);
2851
2852 /* Warning : release_cb() might need to release sk ownership,
2853 * ie call sock_release_ownership(sk) before us.
2854 */
2855 if (sk->sk_prot->release_cb)
2856 sk->sk_prot->release_cb(sk);
2857
2858 sock_release_ownership(sk);
2859 if (waitqueue_active(&sk->sk_lock.wq))
2860 wake_up(&sk->sk_lock.wq);
2861 spin_unlock_bh(&sk->sk_lock.slock);
2862}
2863EXPORT_SYMBOL(release_sock);
2864
2865/**
2866 * lock_sock_fast - fast version of lock_sock
2867 * @sk: socket
2868 *
2869 * This version should be used for very small section, where process wont block
2870 * return false if fast path is taken:
2871 *
2872 * sk_lock.slock locked, owned = 0, BH disabled
2873 *
2874 * return true if slow path is taken:
2875 *
2876 * sk_lock.slock unlocked, owned = 1, BH enabled
2877 */
2878bool lock_sock_fast(struct sock *sk)
2879{
2880 might_sleep();
2881 spin_lock_bh(&sk->sk_lock.slock);
2882
2883 if (!sk->sk_lock.owned)
2884 /*
2885 * Note : We must disable BH
2886 */
2887 return false;
2888
2889 __lock_sock(sk);
2890 sk->sk_lock.owned = 1;
2891 spin_unlock(&sk->sk_lock.slock);
2892 /*
2893 * The sk_lock has mutex_lock() semantics here:
2894 */
2895 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2896 local_bh_enable();
2897 return true;
2898}
2899EXPORT_SYMBOL(lock_sock_fast);
2900
2901int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2902{
2903 struct timeval tv;
2904 if (!sock_flag(sk, SOCK_TIMESTAMP))
2905 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2906 tv = ktime_to_timeval(sk->sk_stamp);
2907 if (tv.tv_sec == -1)
2908 return -ENOENT;
2909 if (tv.tv_sec == 0) {
2910 sk->sk_stamp = ktime_get_real();
2911 tv = ktime_to_timeval(sk->sk_stamp);
2912 }
2913 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
2914}
2915EXPORT_SYMBOL(sock_get_timestamp);
2916
2917int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2918{
2919 struct timespec ts;
2920 if (!sock_flag(sk, SOCK_TIMESTAMP))
2921 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2922 ts = ktime_to_timespec(sk->sk_stamp);
2923 if (ts.tv_sec == -1)
2924 return -ENOENT;
2925 if (ts.tv_sec == 0) {
2926 sk->sk_stamp = ktime_get_real();
2927 ts = ktime_to_timespec(sk->sk_stamp);
2928 }
2929 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2930}
2931EXPORT_SYMBOL(sock_get_timestampns);
2932
2933void sock_enable_timestamp(struct sock *sk, int flag)
2934{
2935 if (!sock_flag(sk, flag)) {
2936 unsigned long previous_flags = sk->sk_flags;
2937
2938 sock_set_flag(sk, flag);
2939 /*
2940 * we just set one of the two flags which require net
2941 * time stamping, but time stamping might have been on
2942 * already because of the other one
2943 */
2944 if (sock_needs_netstamp(sk) &&
2945 !(previous_flags & SK_FLAGS_TIMESTAMP))
2946 net_enable_timestamp();
2947 }
2948}
2949
2950int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2951 int level, int type)
2952{
2953 struct sock_exterr_skb *serr;
2954 struct sk_buff *skb;
2955 int copied, err;
2956
2957 err = -EAGAIN;
2958 skb = sock_dequeue_err_skb(sk);
2959 if (skb == NULL)
2960 goto out;
2961
2962 copied = skb->len;
2963 if (copied > len) {
2964 msg->msg_flags |= MSG_TRUNC;
2965 copied = len;
2966 }
2967 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2968 if (err)
2969 goto out_free_skb;
2970
2971 sock_recv_timestamp(msg, sk, skb);
2972
2973 serr = SKB_EXT_ERR(skb);
2974 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2975
2976 msg->msg_flags |= MSG_ERRQUEUE;
2977 err = copied;
2978
2979out_free_skb:
2980 kfree_skb(skb);
2981out:
2982 return err;
2983}
2984EXPORT_SYMBOL(sock_recv_errqueue);
2985
2986/*
2987 * Get a socket option on an socket.
2988 *
2989 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2990 * asynchronous errors should be reported by getsockopt. We assume
2991 * this means if you specify SO_ERROR (otherwise whats the point of it).
2992 */
2993int sock_common_getsockopt(struct socket *sock, int level, int optname,
2994 char __user *optval, int __user *optlen)
2995{
2996 struct sock *sk = sock->sk;
2997
2998 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2999}
3000EXPORT_SYMBOL(sock_common_getsockopt);
3001
3002#ifdef CONFIG_COMPAT
3003int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
3004 char __user *optval, int __user *optlen)
3005{
3006 struct sock *sk = sock->sk;
3007
3008 if (sk->sk_prot->compat_getsockopt != NULL)
3009 return sk->sk_prot->compat_getsockopt(sk, level, optname,
3010 optval, optlen);
3011 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
3012}
3013EXPORT_SYMBOL(compat_sock_common_getsockopt);
3014#endif
3015
3016int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
3017 int flags)
3018{
3019 struct sock *sk = sock->sk;
3020 int addr_len = 0;
3021 int err;
3022
3023 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
3024 flags & ~MSG_DONTWAIT, &addr_len);
3025 if (err >= 0)
3026 msg->msg_namelen = addr_len;
3027 return err;
3028}
3029EXPORT_SYMBOL(sock_common_recvmsg);
3030
3031/*
3032 * Set socket options on an inet socket.
3033 */
3034int sock_common_setsockopt(struct socket *sock, int level, int optname,
3035 char __user *optval, unsigned int optlen)
3036{
3037 struct sock *sk = sock->sk;
3038
3039 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
3040}
3041EXPORT_SYMBOL(sock_common_setsockopt);
3042
3043#ifdef CONFIG_COMPAT
3044int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
3045 char __user *optval, unsigned int optlen)
3046{
3047 struct sock *sk = sock->sk;
3048
3049 if (sk->sk_prot->compat_setsockopt != NULL)
3050 return sk->sk_prot->compat_setsockopt(sk, level, optname,
3051 optval, optlen);
3052 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
3053}
3054EXPORT_SYMBOL(compat_sock_common_setsockopt);
3055#endif
3056
3057void sk_common_release(struct sock *sk)
3058{
3059 if (sk->sk_prot->destroy)
3060 sk->sk_prot->destroy(sk);
3061
3062 /*
3063 * Observation: when sock_common_release is called, processes have
3064 * no access to socket. But net still has.
3065 * Step one, detach it from networking:
3066 *
3067 * A. Remove from hash tables.
3068 */
3069
3070 sk->sk_prot->unhash(sk);
3071
3072 /*
3073 * In this point socket cannot receive new packets, but it is possible
3074 * that some packets are in flight because some CPU runs receiver and
3075 * did hash table lookup before we unhashed socket. They will achieve
3076 * receive queue and will be purged by socket destructor.
3077 *
3078 * Also we still have packets pending on receive queue and probably,
3079 * our own packets waiting in device queues. sock_destroy will drain
3080 * receive queue, but transmitted packets will delay socket destruction
3081 * until the last reference will be released.
3082 */
3083
3084 sock_orphan(sk);
3085
3086 xfrm_sk_free_policy(sk);
3087
3088 sk_refcnt_debug_release(sk);
3089
3090 sock_put(sk);
3091}
3092EXPORT_SYMBOL(sk_common_release);
3093
3094void sk_get_meminfo(const struct sock *sk, u32 *mem)
3095{
3096 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
3097
3098 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
3099 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
3100 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
3101 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
3102 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
3103 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
3104 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
3105 mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
3106 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
3107}
3108
3109#ifdef CONFIG_PROC_FS
3110#define PROTO_INUSE_NR 64 /* should be enough for the first time */
3111struct prot_inuse {
3112 int val[PROTO_INUSE_NR];
3113};
3114
3115static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
3116
3117void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
3118{
3119 __this_cpu_add(net->core.prot_inuse->val[prot->inuse_idx], val);
3120}
3121EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
3122
3123int sock_prot_inuse_get(struct net *net, struct proto *prot)
3124{
3125 int cpu, idx = prot->inuse_idx;
3126 int res = 0;
3127
3128 for_each_possible_cpu(cpu)
3129 res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx];
3130
3131 return res >= 0 ? res : 0;
3132}
3133EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
3134
3135static void sock_inuse_add(struct net *net, int val)
3136{
3137 this_cpu_add(*net->core.sock_inuse, val);
3138}
3139
3140int sock_inuse_get(struct net *net)
3141{
3142 int cpu, res = 0;
3143
3144 for_each_possible_cpu(cpu)
3145 res += *per_cpu_ptr(net->core.sock_inuse, cpu);
3146
3147 return res;
3148}
3149
3150EXPORT_SYMBOL_GPL(sock_inuse_get);
3151
3152static int __net_init sock_inuse_init_net(struct net *net)
3153{
3154 net->core.prot_inuse = alloc_percpu(struct prot_inuse);
3155 if (net->core.prot_inuse == NULL)
3156 return -ENOMEM;
3157
3158 net->core.sock_inuse = alloc_percpu(int);
3159 if (net->core.sock_inuse == NULL)
3160 goto out;
3161
3162 return 0;
3163
3164out:
3165 free_percpu(net->core.prot_inuse);
3166 return -ENOMEM;
3167}
3168
3169static void __net_exit sock_inuse_exit_net(struct net *net)
3170{
3171 free_percpu(net->core.prot_inuse);
3172 free_percpu(net->core.sock_inuse);
3173}
3174
3175static struct pernet_operations net_inuse_ops = {
3176 .init = sock_inuse_init_net,
3177 .exit = sock_inuse_exit_net,
3178};
3179
3180static __init int net_inuse_init(void)
3181{
3182 if (register_pernet_subsys(&net_inuse_ops))
3183 panic("Cannot initialize net inuse counters");
3184
3185 return 0;
3186}
3187
3188core_initcall(net_inuse_init);
3189
3190static void assign_proto_idx(struct proto *prot)
3191{
3192 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
3193
3194 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
3195 pr_err("PROTO_INUSE_NR exhausted\n");
3196 return;
3197 }
3198
3199 set_bit(prot->inuse_idx, proto_inuse_idx);
3200}
3201
3202static void release_proto_idx(struct proto *prot)
3203{
3204 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
3205 clear_bit(prot->inuse_idx, proto_inuse_idx);
3206}
3207#else
3208static inline void assign_proto_idx(struct proto *prot)
3209{
3210}
3211
3212static inline void release_proto_idx(struct proto *prot)
3213{
3214}
3215
3216static void sock_inuse_add(struct net *net, int val)
3217{
3218}
3219#endif
3220
3221static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
3222{
3223 if (!rsk_prot)
3224 return;
3225 kfree(rsk_prot->slab_name);
3226 rsk_prot->slab_name = NULL;
3227 kmem_cache_destroy(rsk_prot->slab);
3228 rsk_prot->slab = NULL;
3229}
3230
3231static int req_prot_init(const struct proto *prot)
3232{
3233 struct request_sock_ops *rsk_prot = prot->rsk_prot;
3234
3235 if (!rsk_prot)
3236 return 0;
3237
3238 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
3239 prot->name);
3240 if (!rsk_prot->slab_name)
3241 return -ENOMEM;
3242
3243 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
3244 rsk_prot->obj_size, 0,
3245 prot->slab_flags, NULL);
3246
3247 if (!rsk_prot->slab) {
3248 pr_crit("%s: Can't create request sock SLAB cache!\n",
3249 prot->name);
3250 return -ENOMEM;
3251 }
3252 return 0;
3253}
3254
3255int proto_register(struct proto *prot, int alloc_slab)
3256{
3257 if (alloc_slab) {
3258 prot->slab = kmem_cache_create_usercopy(prot->name,
3259 prot->obj_size, 0,
3260 SLAB_HWCACHE_ALIGN | prot->slab_flags,
3261 prot->useroffset, prot->usersize,
3262 NULL);
3263
3264 if (prot->slab == NULL) {
3265 pr_crit("%s: Can't create sock SLAB cache!\n",
3266 prot->name);
3267 goto out;
3268 }
3269
3270 if (req_prot_init(prot))
3271 goto out_free_request_sock_slab;
3272
3273 if (prot->twsk_prot != NULL) {
3274 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
3275
3276 if (prot->twsk_prot->twsk_slab_name == NULL)
3277 goto out_free_request_sock_slab;
3278
3279 prot->twsk_prot->twsk_slab =
3280 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
3281 prot->twsk_prot->twsk_obj_size,
3282 0,
3283 prot->slab_flags,
3284 NULL);
3285 if (prot->twsk_prot->twsk_slab == NULL)
3286 goto out_free_timewait_sock_slab_name;
3287 }
3288 }
3289
3290 mutex_lock(&proto_list_mutex);
3291 list_add(&prot->node, &proto_list);
3292 assign_proto_idx(prot);
3293 mutex_unlock(&proto_list_mutex);
3294 return 0;
3295
3296out_free_timewait_sock_slab_name:
3297 kfree(prot->twsk_prot->twsk_slab_name);
3298out_free_request_sock_slab:
3299 req_prot_cleanup(prot->rsk_prot);
3300
3301 kmem_cache_destroy(prot->slab);
3302 prot->slab = NULL;
3303out:
3304 return -ENOBUFS;
3305}
3306EXPORT_SYMBOL(proto_register);
3307
3308void proto_unregister(struct proto *prot)
3309{
3310 mutex_lock(&proto_list_mutex);
3311 release_proto_idx(prot);
3312 list_del(&prot->node);
3313 mutex_unlock(&proto_list_mutex);
3314
3315 kmem_cache_destroy(prot->slab);
3316 prot->slab = NULL;
3317
3318 req_prot_cleanup(prot->rsk_prot);
3319
3320 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
3321 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
3322 kfree(prot->twsk_prot->twsk_slab_name);
3323 prot->twsk_prot->twsk_slab = NULL;
3324 }
3325}
3326EXPORT_SYMBOL(proto_unregister);
3327
3328int sock_load_diag_module(int family, int protocol)
3329{
3330 if (!protocol) {
3331 if (!sock_is_registered(family))
3332 return -ENOENT;
3333
3334 return request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
3335 NETLINK_SOCK_DIAG, family);
3336 }
3337
3338#ifdef CONFIG_INET
3339 if (family == AF_INET &&
3340 !rcu_access_pointer(inet_protos[protocol]))
3341 return -ENOENT;
3342#endif
3343
3344 return request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
3345 NETLINK_SOCK_DIAG, family, protocol);
3346}
3347EXPORT_SYMBOL(sock_load_diag_module);
3348
3349#ifdef CONFIG_PROC_FS
3350static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
3351 __acquires(proto_list_mutex)
3352{
3353 mutex_lock(&proto_list_mutex);
3354 return seq_list_start_head(&proto_list, *pos);
3355}
3356
3357static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3358{
3359 return seq_list_next(v, &proto_list, pos);
3360}
3361
3362static void proto_seq_stop(struct seq_file *seq, void *v)
3363 __releases(proto_list_mutex)
3364{
3365 mutex_unlock(&proto_list_mutex);
3366}
3367
3368static char proto_method_implemented(const void *method)
3369{
3370 return method == NULL ? 'n' : 'y';
3371}
3372static long sock_prot_memory_allocated(struct proto *proto)
3373{
3374 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
3375}
3376
3377static char *sock_prot_memory_pressure(struct proto *proto)
3378{
3379 return proto->memory_pressure != NULL ?
3380 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
3381}
3382
3383static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
3384{
3385
3386 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
3387 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3388 proto->name,
3389 proto->obj_size,
3390 sock_prot_inuse_get(seq_file_net(seq), proto),
3391 sock_prot_memory_allocated(proto),
3392 sock_prot_memory_pressure(proto),
3393 proto->max_header,
3394 proto->slab == NULL ? "no" : "yes",
3395 module_name(proto->owner),
3396 proto_method_implemented(proto->close),
3397 proto_method_implemented(proto->connect),
3398 proto_method_implemented(proto->disconnect),
3399 proto_method_implemented(proto->accept),
3400 proto_method_implemented(proto->ioctl),
3401 proto_method_implemented(proto->init),
3402 proto_method_implemented(proto->destroy),
3403 proto_method_implemented(proto->shutdown),
3404 proto_method_implemented(proto->setsockopt),
3405 proto_method_implemented(proto->getsockopt),
3406 proto_method_implemented(proto->sendmsg),
3407 proto_method_implemented(proto->recvmsg),
3408 proto_method_implemented(proto->sendpage),
3409 proto_method_implemented(proto->bind),
3410 proto_method_implemented(proto->backlog_rcv),
3411 proto_method_implemented(proto->hash),
3412 proto_method_implemented(proto->unhash),
3413 proto_method_implemented(proto->get_port),
3414 proto_method_implemented(proto->enter_memory_pressure));
3415}
3416
3417static int proto_seq_show(struct seq_file *seq, void *v)
3418{
3419 if (v == &proto_list)
3420 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3421 "protocol",
3422 "size",
3423 "sockets",
3424 "memory",
3425 "press",
3426 "maxhdr",
3427 "slab",
3428 "module",
3429 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3430 else
3431 proto_seq_printf(seq, list_entry(v, struct proto, node));
3432 return 0;
3433}
3434
3435static const struct seq_operations proto_seq_ops = {
3436 .start = proto_seq_start,
3437 .next = proto_seq_next,
3438 .stop = proto_seq_stop,
3439 .show = proto_seq_show,
3440};
3441
3442static int proto_seq_open(struct inode *inode, struct file *file)
3443{
3444 return seq_open_net(inode, file, &proto_seq_ops,
3445 sizeof(struct seq_net_private));
3446}
3447
3448static const struct file_operations proto_seq_fops = {
3449 .open = proto_seq_open,
3450 .read = seq_read,
3451 .llseek = seq_lseek,
3452 .release = seq_release_net,
3453};
3454
3455static __net_init int proto_init_net(struct net *net)
3456{
3457 if (!proc_create("protocols", 0444, net->proc_net, &proto_seq_fops))
3458 return -ENOMEM;
3459
3460 return 0;
3461}
3462
3463static __net_exit void proto_exit_net(struct net *net)
3464{
3465 remove_proc_entry("protocols", net->proc_net);
3466}
3467
3468
3469static __net_initdata struct pernet_operations proto_net_ops = {
3470 .init = proto_init_net,
3471 .exit = proto_exit_net,
3472};
3473
3474static int __init proto_init(void)
3475{
3476 return register_pernet_subsys(&proto_net_ops);
3477}
3478
3479subsys_initcall(proto_init);
3480
3481#endif /* PROC_FS */
3482
3483#ifdef CONFIG_NET_RX_BUSY_POLL
3484bool sk_busy_loop_end(void *p, unsigned long start_time)
3485{
3486 struct sock *sk = p;
3487
3488 return !skb_queue_empty(&sk->sk_receive_queue) ||
3489 sk_busy_loop_timeout(sk, start_time);
3490}
3491EXPORT_SYMBOL(sk_busy_loop_end);
3492#endif /* CONFIG_NET_RX_BUSY_POLL */