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