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(file: sk->sk_socket->file, ns: user_ns, cap) &&
171 ns_capable(ns: 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;
286int sysctl_mem_pcpu_rsv __read_mostly = SK_MEMORY_PCPU_RESERVE;
287
288int sysctl_tstamp_allow_data __read_mostly = 1;
289
290DEFINE_STATIC_KEY_FALSE(memalloc_socks_key);
291EXPORT_SYMBOL_GPL(memalloc_socks_key);
292
293/**
294 * sk_set_memalloc - sets %SOCK_MEMALLOC
295 * @sk: socket to set it on
296 *
297 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
298 * It's the responsibility of the admin to adjust min_free_kbytes
299 * to meet the requirements
300 */
301void sk_set_memalloc(struct sock *sk)
302{
303 sock_set_flag(sk, flag: SOCK_MEMALLOC);
304 sk->sk_allocation |= __GFP_MEMALLOC;
305 static_branch_inc(&memalloc_socks_key);
306}
307EXPORT_SYMBOL_GPL(sk_set_memalloc);
308
309void sk_clear_memalloc(struct sock *sk)
310{
311 sock_reset_flag(sk, flag: SOCK_MEMALLOC);
312 sk->sk_allocation &= ~__GFP_MEMALLOC;
313 static_branch_dec(&memalloc_socks_key);
314
315 /*
316 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
317 * progress of swapping. SOCK_MEMALLOC may be cleared while
318 * it has rmem allocations due to the last swapfile being deactivated
319 * but there is a risk that the socket is unusable due to exceeding
320 * the rmem limits. Reclaim the reserves and obey rmem limits again.
321 */
322 sk_mem_reclaim(sk);
323}
324EXPORT_SYMBOL_GPL(sk_clear_memalloc);
325
326int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
327{
328 int ret;
329 unsigned int noreclaim_flag;
330
331 /* these should have been dropped before queueing */
332 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
333
334 noreclaim_flag = memalloc_noreclaim_save();
335 ret = INDIRECT_CALL_INET(sk->sk_backlog_rcv,
336 tcp_v6_do_rcv,
337 tcp_v4_do_rcv,
338 sk, skb);
339 memalloc_noreclaim_restore(flags: noreclaim_flag);
340
341 return ret;
342}
343EXPORT_SYMBOL(__sk_backlog_rcv);
344
345void sk_error_report(struct sock *sk)
346{
347 sk->sk_error_report(sk);
348
349 switch (sk->sk_family) {
350 case AF_INET:
351 fallthrough;
352 case AF_INET6:
353 trace_inet_sk_error_report(sk);
354 break;
355 default:
356 break;
357 }
358}
359EXPORT_SYMBOL(sk_error_report);
360
361int sock_get_timeout(long timeo, void *optval, bool old_timeval)
362{
363 struct __kernel_sock_timeval tv;
364
365 if (timeo == MAX_SCHEDULE_TIMEOUT) {
366 tv.tv_sec = 0;
367 tv.tv_usec = 0;
368 } else {
369 tv.tv_sec = timeo / HZ;
370 tv.tv_usec = ((timeo % HZ) * USEC_PER_SEC) / HZ;
371 }
372
373 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
374 struct old_timeval32 tv32 = { tv.tv_sec, tv.tv_usec };
375 *(struct old_timeval32 *)optval = tv32;
376 return sizeof(tv32);
377 }
378
379 if (old_timeval) {
380 struct __kernel_old_timeval old_tv;
381 old_tv.tv_sec = tv.tv_sec;
382 old_tv.tv_usec = tv.tv_usec;
383 *(struct __kernel_old_timeval *)optval = old_tv;
384 return sizeof(old_tv);
385 }
386
387 *(struct __kernel_sock_timeval *)optval = tv;
388 return sizeof(tv);
389}
390EXPORT_SYMBOL(sock_get_timeout);
391
392int sock_copy_user_timeval(struct __kernel_sock_timeval *tv,
393 sockptr_t optval, int optlen, bool old_timeval)
394{
395 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
396 struct old_timeval32 tv32;
397
398 if (optlen < sizeof(tv32))
399 return -EINVAL;
400
401 if (copy_from_sockptr(dst: &tv32, src: optval, size: sizeof(tv32)))
402 return -EFAULT;
403 tv->tv_sec = tv32.tv_sec;
404 tv->tv_usec = tv32.tv_usec;
405 } else if (old_timeval) {
406 struct __kernel_old_timeval old_tv;
407
408 if (optlen < sizeof(old_tv))
409 return -EINVAL;
410 if (copy_from_sockptr(dst: &old_tv, src: optval, size: sizeof(old_tv)))
411 return -EFAULT;
412 tv->tv_sec = old_tv.tv_sec;
413 tv->tv_usec = old_tv.tv_usec;
414 } else {
415 if (optlen < sizeof(*tv))
416 return -EINVAL;
417 if (copy_from_sockptr(dst: tv, src: optval, size: sizeof(*tv)))
418 return -EFAULT;
419 }
420
421 return 0;
422}
423EXPORT_SYMBOL(sock_copy_user_timeval);
424
425static int sock_set_timeout(long *timeo_p, sockptr_t optval, int optlen,
426 bool old_timeval)
427{
428 struct __kernel_sock_timeval tv;
429 int err = sock_copy_user_timeval(&tv, optval, optlen, old_timeval);
430 long val;
431
432 if (err)
433 return err;
434
435 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
436 return -EDOM;
437
438 if (tv.tv_sec < 0) {
439 static int warned __read_mostly;
440
441 WRITE_ONCE(*timeo_p, 0);
442 if (warned < 10 && net_ratelimit()) {
443 warned++;
444 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
445 __func__, current->comm, task_pid_nr(current));
446 }
447 return 0;
448 }
449 val = MAX_SCHEDULE_TIMEOUT;
450 if ((tv.tv_sec || tv.tv_usec) &&
451 (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)))
452 val = tv.tv_sec * HZ + DIV_ROUND_UP((unsigned long)tv.tv_usec,
453 USEC_PER_SEC / HZ);
454 WRITE_ONCE(*timeo_p, val);
455 return 0;
456}
457
458static bool sock_needs_netstamp(const struct sock *sk)
459{
460 switch (sk->sk_family) {
461 case AF_UNSPEC:
462 case AF_UNIX:
463 return false;
464 default:
465 return true;
466 }
467}
468
469static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
470{
471 if (sk->sk_flags & flags) {
472 sk->sk_flags &= ~flags;
473 if (sock_needs_netstamp(sk) &&
474 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
475 net_disable_timestamp();
476 }
477}
478
479
480int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
481{
482 unsigned long flags;
483 struct sk_buff_head *list = &sk->sk_receive_queue;
484
485 if (atomic_read(v: &sk->sk_rmem_alloc) >= READ_ONCE(sk->sk_rcvbuf)) {
486 atomic_inc(v: &sk->sk_drops);
487 trace_sock_rcvqueue_full(sk, skb);
488 return -ENOMEM;
489 }
490
491 if (!sk_rmem_schedule(sk, skb, size: skb->truesize)) {
492 atomic_inc(v: &sk->sk_drops);
493 return -ENOBUFS;
494 }
495
496 skb->dev = NULL;
497 skb_set_owner_r(skb, sk);
498
499 /* we escape from rcu protected region, make sure we dont leak
500 * a norefcounted dst
501 */
502 skb_dst_force(skb);
503
504 spin_lock_irqsave(&list->lock, flags);
505 sock_skb_set_dropcount(sk, skb);
506 __skb_queue_tail(list, newsk: skb);
507 spin_unlock_irqrestore(lock: &list->lock, flags);
508
509 if (!sock_flag(sk, flag: SOCK_DEAD))
510 sk->sk_data_ready(sk);
511 return 0;
512}
513EXPORT_SYMBOL(__sock_queue_rcv_skb);
514
515int sock_queue_rcv_skb_reason(struct sock *sk, struct sk_buff *skb,
516 enum skb_drop_reason *reason)
517{
518 enum skb_drop_reason drop_reason;
519 int err;
520
521 err = sk_filter(sk, skb);
522 if (err) {
523 drop_reason = SKB_DROP_REASON_SOCKET_FILTER;
524 goto out;
525 }
526 err = __sock_queue_rcv_skb(sk, skb);
527 switch (err) {
528 case -ENOMEM:
529 drop_reason = SKB_DROP_REASON_SOCKET_RCVBUFF;
530 break;
531 case -ENOBUFS:
532 drop_reason = SKB_DROP_REASON_PROTO_MEM;
533 break;
534 default:
535 drop_reason = SKB_NOT_DROPPED_YET;
536 break;
537 }
538out:
539 if (reason)
540 *reason = drop_reason;
541 return err;
542}
543EXPORT_SYMBOL(sock_queue_rcv_skb_reason);
544
545int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
546 const int nested, unsigned int trim_cap, bool refcounted)
547{
548 int rc = NET_RX_SUCCESS;
549
550 if (sk_filter_trim_cap(sk, skb, cap: trim_cap))
551 goto discard_and_relse;
552
553 skb->dev = NULL;
554
555 if (sk_rcvqueues_full(sk, READ_ONCE(sk->sk_rcvbuf))) {
556 atomic_inc(v: &sk->sk_drops);
557 goto discard_and_relse;
558 }
559 if (nested)
560 bh_lock_sock_nested(sk);
561 else
562 bh_lock_sock(sk);
563 if (!sock_owned_by_user(sk)) {
564 /*
565 * trylock + unlock semantics:
566 */
567 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
568
569 rc = sk_backlog_rcv(sk, skb);
570
571 mutex_release(&sk->sk_lock.dep_map, _RET_IP_);
572 } else if (sk_add_backlog(sk, skb, READ_ONCE(sk->sk_rcvbuf))) {
573 bh_unlock_sock(sk);
574 atomic_inc(v: &sk->sk_drops);
575 goto discard_and_relse;
576 }
577
578 bh_unlock_sock(sk);
579out:
580 if (refcounted)
581 sock_put(sk);
582 return rc;
583discard_and_relse:
584 kfree_skb(skb);
585 goto out;
586}
587EXPORT_SYMBOL(__sk_receive_skb);
588
589INDIRECT_CALLABLE_DECLARE(struct dst_entry *ip6_dst_check(struct dst_entry *,
590 u32));
591INDIRECT_CALLABLE_DECLARE(struct dst_entry *ipv4_dst_check(struct dst_entry *,
592 u32));
593struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
594{
595 struct dst_entry *dst = __sk_dst_get(sk);
596
597 if (dst && dst->obsolete &&
598 INDIRECT_CALL_INET(dst->ops->check, ip6_dst_check, ipv4_dst_check,
599 dst, cookie) == NULL) {
600 sk_tx_queue_clear(sk);
601 WRITE_ONCE(sk->sk_dst_pending_confirm, 0);
602 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
603 dst_release(dst);
604 return NULL;
605 }
606
607 return dst;
608}
609EXPORT_SYMBOL(__sk_dst_check);
610
611struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
612{
613 struct dst_entry *dst = sk_dst_get(sk);
614
615 if (dst && dst->obsolete &&
616 INDIRECT_CALL_INET(dst->ops->check, ip6_dst_check, ipv4_dst_check,
617 dst, cookie) == NULL) {
618 sk_dst_reset(sk);
619 dst_release(dst);
620 return NULL;
621 }
622
623 return dst;
624}
625EXPORT_SYMBOL(sk_dst_check);
626
627static int sock_bindtoindex_locked(struct sock *sk, int ifindex)
628{
629 int ret = -ENOPROTOOPT;
630#ifdef CONFIG_NETDEVICES
631 struct net *net = sock_net(sk);
632
633 /* Sorry... */
634 ret = -EPERM;
635 if (sk->sk_bound_dev_if && !ns_capable(ns: net->user_ns, CAP_NET_RAW))
636 goto out;
637
638 ret = -EINVAL;
639 if (ifindex < 0)
640 goto out;
641
642 /* Paired with all READ_ONCE() done locklessly. */
643 WRITE_ONCE(sk->sk_bound_dev_if, ifindex);
644
645 if (sk->sk_prot->rehash)
646 sk->sk_prot->rehash(sk);
647 sk_dst_reset(sk);
648
649 ret = 0;
650
651out:
652#endif
653
654 return ret;
655}
656
657int sock_bindtoindex(struct sock *sk, int ifindex, bool lock_sk)
658{
659 int ret;
660
661 if (lock_sk)
662 lock_sock(sk);
663 ret = sock_bindtoindex_locked(sk, ifindex);
664 if (lock_sk)
665 release_sock(sk);
666
667 return ret;
668}
669EXPORT_SYMBOL(sock_bindtoindex);
670
671static int sock_setbindtodevice(struct sock *sk, sockptr_t optval, int optlen)
672{
673 int ret = -ENOPROTOOPT;
674#ifdef CONFIG_NETDEVICES
675 struct net *net = sock_net(sk);
676 char devname[IFNAMSIZ];
677 int index;
678
679 ret = -EINVAL;
680 if (optlen < 0)
681 goto out;
682
683 /* Bind this socket to a particular device like "eth0",
684 * as specified in the passed interface name. If the
685 * name is "" or the option length is zero the socket
686 * is not bound.
687 */
688 if (optlen > IFNAMSIZ - 1)
689 optlen = IFNAMSIZ - 1;
690 memset(devname, 0, sizeof(devname));
691
692 ret = -EFAULT;
693 if (copy_from_sockptr(dst: devname, src: optval, size: optlen))
694 goto out;
695
696 index = 0;
697 if (devname[0] != '\0') {
698 struct net_device *dev;
699
700 rcu_read_lock();
701 dev = dev_get_by_name_rcu(net, name: devname);
702 if (dev)
703 index = dev->ifindex;
704 rcu_read_unlock();
705 ret = -ENODEV;
706 if (!dev)
707 goto out;
708 }
709
710 sockopt_lock_sock(sk);
711 ret = sock_bindtoindex_locked(sk, ifindex: index);
712 sockopt_release_sock(sk);
713out:
714#endif
715
716 return ret;
717}
718
719static int sock_getbindtodevice(struct sock *sk, sockptr_t optval,
720 sockptr_t optlen, int len)
721{
722 int ret = -ENOPROTOOPT;
723#ifdef CONFIG_NETDEVICES
724 int bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
725 struct net *net = sock_net(sk);
726 char devname[IFNAMSIZ];
727
728 if (bound_dev_if == 0) {
729 len = 0;
730 goto zero;
731 }
732
733 ret = -EINVAL;
734 if (len < IFNAMSIZ)
735 goto out;
736
737 ret = netdev_get_name(net, name: devname, ifindex: bound_dev_if);
738 if (ret)
739 goto out;
740
741 len = strlen(devname) + 1;
742
743 ret = -EFAULT;
744 if (copy_to_sockptr(dst: optval, src: devname, size: len))
745 goto out;
746
747zero:
748 ret = -EFAULT;
749 if (copy_to_sockptr(dst: optlen, src: &len, size: sizeof(int)))
750 goto out;
751
752 ret = 0;
753
754out:
755#endif
756
757 return ret;
758}
759
760bool sk_mc_loop(const struct sock *sk)
761{
762 if (dev_recursion_level())
763 return false;
764 if (!sk)
765 return true;
766 /* IPV6_ADDRFORM can change sk->sk_family under us. */
767 switch (READ_ONCE(sk->sk_family)) {
768 case AF_INET:
769 return inet_test_bit(MC_LOOP, sk);
770#if IS_ENABLED(CONFIG_IPV6)
771 case AF_INET6:
772 return inet6_test_bit(MC6_LOOP, sk);
773#endif
774 }
775 WARN_ON_ONCE(1);
776 return true;
777}
778EXPORT_SYMBOL(sk_mc_loop);
779
780void sock_set_reuseaddr(struct sock *sk)
781{
782 lock_sock(sk);
783 sk->sk_reuse = SK_CAN_REUSE;
784 release_sock(sk);
785}
786EXPORT_SYMBOL(sock_set_reuseaddr);
787
788void sock_set_reuseport(struct sock *sk)
789{
790 lock_sock(sk);
791 sk->sk_reuseport = true;
792 release_sock(sk);
793}
794EXPORT_SYMBOL(sock_set_reuseport);
795
796void sock_no_linger(struct sock *sk)
797{
798 lock_sock(sk);
799 WRITE_ONCE(sk->sk_lingertime, 0);
800 sock_set_flag(sk, flag: SOCK_LINGER);
801 release_sock(sk);
802}
803EXPORT_SYMBOL(sock_no_linger);
804
805void sock_set_priority(struct sock *sk, u32 priority)
806{
807 WRITE_ONCE(sk->sk_priority, priority);
808}
809EXPORT_SYMBOL(sock_set_priority);
810
811void sock_set_sndtimeo(struct sock *sk, s64 secs)
812{
813 lock_sock(sk);
814 if (secs && secs < MAX_SCHEDULE_TIMEOUT / HZ - 1)
815 WRITE_ONCE(sk->sk_sndtimeo, secs * HZ);
816 else
817 WRITE_ONCE(sk->sk_sndtimeo, MAX_SCHEDULE_TIMEOUT);
818 release_sock(sk);
819}
820EXPORT_SYMBOL(sock_set_sndtimeo);
821
822static void __sock_set_timestamps(struct sock *sk, bool val, bool new, bool ns)
823{
824 if (val) {
825 sock_valbool_flag(sk, bit: SOCK_TSTAMP_NEW, valbool: new);
826 sock_valbool_flag(sk, bit: SOCK_RCVTSTAMPNS, valbool: ns);
827 sock_set_flag(sk, flag: SOCK_RCVTSTAMP);
828 sock_enable_timestamp(sk, flag: SOCK_TIMESTAMP);
829 } else {
830 sock_reset_flag(sk, flag: SOCK_RCVTSTAMP);
831 sock_reset_flag(sk, flag: SOCK_RCVTSTAMPNS);
832 }
833}
834
835void sock_enable_timestamps(struct sock *sk)
836{
837 lock_sock(sk);
838 __sock_set_timestamps(sk, val: true, new: false, ns: true);
839 release_sock(sk);
840}
841EXPORT_SYMBOL(sock_enable_timestamps);
842
843void sock_set_timestamp(struct sock *sk, int optname, bool valbool)
844{
845 switch (optname) {
846 case SO_TIMESTAMP_OLD:
847 __sock_set_timestamps(sk, val: valbool, new: false, ns: false);
848 break;
849 case SO_TIMESTAMP_NEW:
850 __sock_set_timestamps(sk, val: valbool, new: true, ns: false);
851 break;
852 case SO_TIMESTAMPNS_OLD:
853 __sock_set_timestamps(sk, val: valbool, new: false, ns: true);
854 break;
855 case SO_TIMESTAMPNS_NEW:
856 __sock_set_timestamps(sk, val: valbool, new: true, ns: true);
857 break;
858 }
859}
860
861static int sock_timestamping_bind_phc(struct sock *sk, int phc_index)
862{
863 struct net *net = sock_net(sk);
864 struct net_device *dev = NULL;
865 bool match = false;
866 int *vclock_index;
867 int i, num;
868
869 if (sk->sk_bound_dev_if)
870 dev = dev_get_by_index(net, ifindex: sk->sk_bound_dev_if);
871
872 if (!dev) {
873 pr_err("%s: sock not bind to device\n", __func__);
874 return -EOPNOTSUPP;
875 }
876
877 num = ethtool_get_phc_vclocks(dev, vclock_index: &vclock_index);
878 dev_put(dev);
879
880 for (i = 0; i < num; i++) {
881 if (*(vclock_index + i) == phc_index) {
882 match = true;
883 break;
884 }
885 }
886
887 if (num > 0)
888 kfree(objp: vclock_index);
889
890 if (!match)
891 return -EINVAL;
892
893 WRITE_ONCE(sk->sk_bind_phc, phc_index);
894
895 return 0;
896}
897
898int sock_set_timestamping(struct sock *sk, int optname,
899 struct so_timestamping timestamping)
900{
901 int val = timestamping.flags;
902 int ret;
903
904 if (val & ~SOF_TIMESTAMPING_MASK)
905 return -EINVAL;
906
907 if (val & SOF_TIMESTAMPING_OPT_ID_TCP &&
908 !(val & SOF_TIMESTAMPING_OPT_ID))
909 return -EINVAL;
910
911 if (val & SOF_TIMESTAMPING_OPT_ID &&
912 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
913 if (sk_is_tcp(sk)) {
914 if ((1 << sk->sk_state) &
915 (TCPF_CLOSE | TCPF_LISTEN))
916 return -EINVAL;
917 if (val & SOF_TIMESTAMPING_OPT_ID_TCP)
918 atomic_set(v: &sk->sk_tskey, tcp_sk(sk)->write_seq);
919 else
920 atomic_set(v: &sk->sk_tskey, tcp_sk(sk)->snd_una);
921 } else {
922 atomic_set(v: &sk->sk_tskey, i: 0);
923 }
924 }
925
926 if (val & SOF_TIMESTAMPING_OPT_STATS &&
927 !(val & SOF_TIMESTAMPING_OPT_TSONLY))
928 return -EINVAL;
929
930 if (val & SOF_TIMESTAMPING_BIND_PHC) {
931 ret = sock_timestamping_bind_phc(sk, phc_index: timestamping.bind_phc);
932 if (ret)
933 return ret;
934 }
935
936 WRITE_ONCE(sk->sk_tsflags, val);
937 sock_valbool_flag(sk, bit: SOCK_TSTAMP_NEW, valbool: optname == SO_TIMESTAMPING_NEW);
938
939 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
940 sock_enable_timestamp(sk,
941 flag: SOCK_TIMESTAMPING_RX_SOFTWARE);
942 else
943 sock_disable_timestamp(sk,
944 flags: (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
945 return 0;
946}
947
948void sock_set_keepalive(struct sock *sk)
949{
950 lock_sock(sk);
951 if (sk->sk_prot->keepalive)
952 sk->sk_prot->keepalive(sk, true);
953 sock_valbool_flag(sk, bit: SOCK_KEEPOPEN, valbool: true);
954 release_sock(sk);
955}
956EXPORT_SYMBOL(sock_set_keepalive);
957
958static void __sock_set_rcvbuf(struct sock *sk, int val)
959{
960 /* Ensure val * 2 fits into an int, to prevent max_t() from treating it
961 * as a negative value.
962 */
963 val = min_t(int, val, INT_MAX / 2);
964 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
965
966 /* We double it on the way in to account for "struct sk_buff" etc.
967 * overhead. Applications assume that the SO_RCVBUF setting they make
968 * will allow that much actual data to be received on that socket.
969 *
970 * Applications are unaware that "struct sk_buff" and other overheads
971 * allocate from the receive buffer during socket buffer allocation.
972 *
973 * And after considering the possible alternatives, returning the value
974 * we actually used in getsockopt is the most desirable behavior.
975 */
976 WRITE_ONCE(sk->sk_rcvbuf, max_t(int, val * 2, SOCK_MIN_RCVBUF));
977}
978
979void sock_set_rcvbuf(struct sock *sk, int val)
980{
981 lock_sock(sk);
982 __sock_set_rcvbuf(sk, val);
983 release_sock(sk);
984}
985EXPORT_SYMBOL(sock_set_rcvbuf);
986
987static void __sock_set_mark(struct sock *sk, u32 val)
988{
989 if (val != sk->sk_mark) {
990 WRITE_ONCE(sk->sk_mark, val);
991 sk_dst_reset(sk);
992 }
993}
994
995void sock_set_mark(struct sock *sk, u32 val)
996{
997 lock_sock(sk);
998 __sock_set_mark(sk, val);
999 release_sock(sk);
1000}
1001EXPORT_SYMBOL(sock_set_mark);
1002
1003static void sock_release_reserved_memory(struct sock *sk, int bytes)
1004{
1005 /* Round down bytes to multiple of pages */
1006 bytes = round_down(bytes, PAGE_SIZE);
1007
1008 WARN_ON(bytes > sk->sk_reserved_mem);
1009 WRITE_ONCE(sk->sk_reserved_mem, sk->sk_reserved_mem - bytes);
1010 sk_mem_reclaim(sk);
1011}
1012
1013static int sock_reserve_memory(struct sock *sk, int bytes)
1014{
1015 long allocated;
1016 bool charged;
1017 int pages;
1018
1019 if (!mem_cgroup_sockets_enabled || !sk->sk_memcg || !sk_has_account(sk))
1020 return -EOPNOTSUPP;
1021
1022 if (!bytes)
1023 return 0;
1024
1025 pages = sk_mem_pages(amt: bytes);
1026
1027 /* pre-charge to memcg */
1028 charged = mem_cgroup_charge_skmem(memcg: sk->sk_memcg, nr_pages: pages,
1029 GFP_KERNEL | __GFP_RETRY_MAYFAIL);
1030 if (!charged)
1031 return -ENOMEM;
1032
1033 /* pre-charge to forward_alloc */
1034 sk_memory_allocated_add(sk, amt: pages);
1035 allocated = sk_memory_allocated(sk);
1036 /* If the system goes into memory pressure with this
1037 * precharge, give up and return error.
1038 */
1039 if (allocated > sk_prot_mem_limits(sk, index: 1)) {
1040 sk_memory_allocated_sub(sk, amt: pages);
1041 mem_cgroup_uncharge_skmem(memcg: sk->sk_memcg, nr_pages: pages);
1042 return -ENOMEM;
1043 }
1044 sk_forward_alloc_add(sk, val: pages << PAGE_SHIFT);
1045
1046 WRITE_ONCE(sk->sk_reserved_mem,
1047 sk->sk_reserved_mem + (pages << PAGE_SHIFT));
1048
1049 return 0;
1050}
1051
1052void sockopt_lock_sock(struct sock *sk)
1053{
1054 /* When current->bpf_ctx is set, the setsockopt is called from
1055 * a bpf prog. bpf has ensured the sk lock has been
1056 * acquired before calling setsockopt().
1057 */
1058 if (has_current_bpf_ctx())
1059 return;
1060
1061 lock_sock(sk);
1062}
1063EXPORT_SYMBOL(sockopt_lock_sock);
1064
1065void sockopt_release_sock(struct sock *sk)
1066{
1067 if (has_current_bpf_ctx())
1068 return;
1069
1070 release_sock(sk);
1071}
1072EXPORT_SYMBOL(sockopt_release_sock);
1073
1074bool sockopt_ns_capable(struct user_namespace *ns, int cap)
1075{
1076 return has_current_bpf_ctx() || ns_capable(ns, cap);
1077}
1078EXPORT_SYMBOL(sockopt_ns_capable);
1079
1080bool sockopt_capable(int cap)
1081{
1082 return has_current_bpf_ctx() || capable(cap);
1083}
1084EXPORT_SYMBOL(sockopt_capable);
1085
1086/*
1087 * This is meant for all protocols to use and covers goings on
1088 * at the socket level. Everything here is generic.
1089 */
1090
1091int sk_setsockopt(struct sock *sk, int level, int optname,
1092 sockptr_t optval, unsigned int optlen)
1093{
1094 struct so_timestamping timestamping;
1095 struct socket *sock = sk->sk_socket;
1096 struct sock_txtime sk_txtime;
1097 int val;
1098 int valbool;
1099 struct linger ling;
1100 int ret = 0;
1101
1102 /*
1103 * Options without arguments
1104 */
1105
1106 if (optname == SO_BINDTODEVICE)
1107 return sock_setbindtodevice(sk, optval, optlen);
1108
1109 if (optlen < sizeof(int))
1110 return -EINVAL;
1111
1112 if (copy_from_sockptr(dst: &val, src: optval, size: sizeof(val)))
1113 return -EFAULT;
1114
1115 valbool = val ? 1 : 0;
1116
1117 /* handle options which do not require locking the socket. */
1118 switch (optname) {
1119 case SO_PRIORITY:
1120 if ((val >= 0 && val <= 6) ||
1121 sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) ||
1122 sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1123 sock_set_priority(sk, val);
1124 return 0;
1125 }
1126 return -EPERM;
1127 case SO_PASSSEC:
1128 assign_bit(SOCK_PASSSEC, addr: &sock->flags, value: valbool);
1129 return 0;
1130 case SO_PASSCRED:
1131 assign_bit(SOCK_PASSCRED, addr: &sock->flags, value: valbool);
1132 return 0;
1133 case SO_PASSPIDFD:
1134 assign_bit(SOCK_PASSPIDFD, addr: &sock->flags, value: valbool);
1135 return 0;
1136 case SO_TYPE:
1137 case SO_PROTOCOL:
1138 case SO_DOMAIN:
1139 case SO_ERROR:
1140 return -ENOPROTOOPT;
1141#ifdef CONFIG_NET_RX_BUSY_POLL
1142 case SO_BUSY_POLL:
1143 if (val < 0)
1144 return -EINVAL;
1145 WRITE_ONCE(sk->sk_ll_usec, val);
1146 return 0;
1147 case SO_PREFER_BUSY_POLL:
1148 if (valbool && !sockopt_capable(CAP_NET_ADMIN))
1149 return -EPERM;
1150 WRITE_ONCE(sk->sk_prefer_busy_poll, valbool);
1151 return 0;
1152 case SO_BUSY_POLL_BUDGET:
1153 if (val > READ_ONCE(sk->sk_busy_poll_budget) &&
1154 !sockopt_capable(CAP_NET_ADMIN))
1155 return -EPERM;
1156 if (val < 0 || val > U16_MAX)
1157 return -EINVAL;
1158 WRITE_ONCE(sk->sk_busy_poll_budget, val);
1159 return 0;
1160#endif
1161 case SO_MAX_PACING_RATE:
1162 {
1163 unsigned long ulval = (val == ~0U) ? ~0UL : (unsigned int)val;
1164 unsigned long pacing_rate;
1165
1166 if (sizeof(ulval) != sizeof(val) &&
1167 optlen >= sizeof(ulval) &&
1168 copy_from_sockptr(dst: &ulval, src: optval, size: sizeof(ulval))) {
1169 return -EFAULT;
1170 }
1171 if (ulval != ~0UL)
1172 cmpxchg(&sk->sk_pacing_status,
1173 SK_PACING_NONE,
1174 SK_PACING_NEEDED);
1175 /* Pairs with READ_ONCE() from sk_getsockopt() */
1176 WRITE_ONCE(sk->sk_max_pacing_rate, ulval);
1177 pacing_rate = READ_ONCE(sk->sk_pacing_rate);
1178 if (ulval < pacing_rate)
1179 WRITE_ONCE(sk->sk_pacing_rate, ulval);
1180 return 0;
1181 }
1182 case SO_TXREHASH:
1183 if (val < -1 || val > 1)
1184 return -EINVAL;
1185 if ((u8)val == SOCK_TXREHASH_DEFAULT)
1186 val = READ_ONCE(sock_net(sk)->core.sysctl_txrehash);
1187 /* Paired with READ_ONCE() in tcp_rtx_synack()
1188 * and sk_getsockopt().
1189 */
1190 WRITE_ONCE(sk->sk_txrehash, (u8)val);
1191 return 0;
1192 case SO_PEEK_OFF:
1193 {
1194 int (*set_peek_off)(struct sock *sk, int val);
1195
1196 set_peek_off = READ_ONCE(sock->ops)->set_peek_off;
1197 if (set_peek_off)
1198 ret = set_peek_off(sk, val);
1199 else
1200 ret = -EOPNOTSUPP;
1201 return ret;
1202 }
1203 }
1204
1205 sockopt_lock_sock(sk);
1206
1207 switch (optname) {
1208 case SO_DEBUG:
1209 if (val && !sockopt_capable(CAP_NET_ADMIN))
1210 ret = -EACCES;
1211 else
1212 sock_valbool_flag(sk, bit: SOCK_DBG, valbool);
1213 break;
1214 case SO_REUSEADDR:
1215 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
1216 break;
1217 case SO_REUSEPORT:
1218 sk->sk_reuseport = valbool;
1219 break;
1220 case SO_DONTROUTE:
1221 sock_valbool_flag(sk, bit: SOCK_LOCALROUTE, valbool);
1222 sk_dst_reset(sk);
1223 break;
1224 case SO_BROADCAST:
1225 sock_valbool_flag(sk, bit: SOCK_BROADCAST, valbool);
1226 break;
1227 case SO_SNDBUF:
1228 /* Don't error on this BSD doesn't and if you think
1229 * about it this is right. Otherwise apps have to
1230 * play 'guess the biggest size' games. RCVBUF/SNDBUF
1231 * are treated in BSD as hints
1232 */
1233 val = min_t(u32, val, READ_ONCE(sysctl_wmem_max));
1234set_sndbuf:
1235 /* Ensure val * 2 fits into an int, to prevent max_t()
1236 * from treating it as a negative value.
1237 */
1238 val = min_t(int, val, INT_MAX / 2);
1239 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1240 WRITE_ONCE(sk->sk_sndbuf,
1241 max_t(int, val * 2, SOCK_MIN_SNDBUF));
1242 /* Wake up sending tasks if we upped the value. */
1243 sk->sk_write_space(sk);
1244 break;
1245
1246 case SO_SNDBUFFORCE:
1247 if (!sockopt_capable(CAP_NET_ADMIN)) {
1248 ret = -EPERM;
1249 break;
1250 }
1251
1252 /* No negative values (to prevent underflow, as val will be
1253 * multiplied by 2).
1254 */
1255 if (val < 0)
1256 val = 0;
1257 goto set_sndbuf;
1258
1259 case SO_RCVBUF:
1260 /* Don't error on this BSD doesn't and if you think
1261 * about it this is right. Otherwise apps have to
1262 * play 'guess the biggest size' games. RCVBUF/SNDBUF
1263 * are treated in BSD as hints
1264 */
1265 __sock_set_rcvbuf(sk, min_t(u32, val, READ_ONCE(sysctl_rmem_max)));
1266 break;
1267
1268 case SO_RCVBUFFORCE:
1269 if (!sockopt_capable(CAP_NET_ADMIN)) {
1270 ret = -EPERM;
1271 break;
1272 }
1273
1274 /* No negative values (to prevent underflow, as val will be
1275 * multiplied by 2).
1276 */
1277 __sock_set_rcvbuf(sk, max(val, 0));
1278 break;
1279
1280 case SO_KEEPALIVE:
1281 if (sk->sk_prot->keepalive)
1282 sk->sk_prot->keepalive(sk, valbool);
1283 sock_valbool_flag(sk, bit: SOCK_KEEPOPEN, valbool);
1284 break;
1285
1286 case SO_OOBINLINE:
1287 sock_valbool_flag(sk, bit: SOCK_URGINLINE, valbool);
1288 break;
1289
1290 case SO_NO_CHECK:
1291 sk->sk_no_check_tx = valbool;
1292 break;
1293
1294 case SO_LINGER:
1295 if (optlen < sizeof(ling)) {
1296 ret = -EINVAL; /* 1003.1g */
1297 break;
1298 }
1299 if (copy_from_sockptr(dst: &ling, src: optval, size: sizeof(ling))) {
1300 ret = -EFAULT;
1301 break;
1302 }
1303 if (!ling.l_onoff) {
1304 sock_reset_flag(sk, flag: SOCK_LINGER);
1305 } else {
1306 unsigned long t_sec = ling.l_linger;
1307
1308 if (t_sec >= MAX_SCHEDULE_TIMEOUT / HZ)
1309 WRITE_ONCE(sk->sk_lingertime, MAX_SCHEDULE_TIMEOUT);
1310 else
1311 WRITE_ONCE(sk->sk_lingertime, t_sec * HZ);
1312 sock_set_flag(sk, flag: SOCK_LINGER);
1313 }
1314 break;
1315
1316 case SO_BSDCOMPAT:
1317 break;
1318
1319 case SO_TIMESTAMP_OLD:
1320 case SO_TIMESTAMP_NEW:
1321 case SO_TIMESTAMPNS_OLD:
1322 case SO_TIMESTAMPNS_NEW:
1323 sock_set_timestamp(sk, optname, valbool);
1324 break;
1325
1326 case SO_TIMESTAMPING_NEW:
1327 case SO_TIMESTAMPING_OLD:
1328 if (optlen == sizeof(timestamping)) {
1329 if (copy_from_sockptr(dst: &timestamping, src: optval,
1330 size: sizeof(timestamping))) {
1331 ret = -EFAULT;
1332 break;
1333 }
1334 } else {
1335 memset(&timestamping, 0, sizeof(timestamping));
1336 timestamping.flags = val;
1337 }
1338 ret = sock_set_timestamping(sk, optname, timestamping);
1339 break;
1340
1341 case SO_RCVLOWAT:
1342 {
1343 int (*set_rcvlowat)(struct sock *sk, int val) = NULL;
1344
1345 if (val < 0)
1346 val = INT_MAX;
1347 if (sock)
1348 set_rcvlowat = READ_ONCE(sock->ops)->set_rcvlowat;
1349 if (set_rcvlowat)
1350 ret = set_rcvlowat(sk, val);
1351 else
1352 WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
1353 break;
1354 }
1355 case SO_RCVTIMEO_OLD:
1356 case SO_RCVTIMEO_NEW:
1357 ret = sock_set_timeout(timeo_p: &sk->sk_rcvtimeo, optval,
1358 optlen, old_timeval: optname == SO_RCVTIMEO_OLD);
1359 break;
1360
1361 case SO_SNDTIMEO_OLD:
1362 case SO_SNDTIMEO_NEW:
1363 ret = sock_set_timeout(timeo_p: &sk->sk_sndtimeo, optval,
1364 optlen, old_timeval: optname == SO_SNDTIMEO_OLD);
1365 break;
1366
1367 case SO_ATTACH_FILTER: {
1368 struct sock_fprog fprog;
1369
1370 ret = copy_bpf_fprog_from_user(dst: &fprog, src: optval, len: optlen);
1371 if (!ret)
1372 ret = sk_attach_filter(fprog: &fprog, sk);
1373 break;
1374 }
1375 case SO_ATTACH_BPF:
1376 ret = -EINVAL;
1377 if (optlen == sizeof(u32)) {
1378 u32 ufd;
1379
1380 ret = -EFAULT;
1381 if (copy_from_sockptr(dst: &ufd, src: optval, size: sizeof(ufd)))
1382 break;
1383
1384 ret = sk_attach_bpf(ufd, sk);
1385 }
1386 break;
1387
1388 case SO_ATTACH_REUSEPORT_CBPF: {
1389 struct sock_fprog fprog;
1390
1391 ret = copy_bpf_fprog_from_user(dst: &fprog, src: optval, len: optlen);
1392 if (!ret)
1393 ret = sk_reuseport_attach_filter(fprog: &fprog, sk);
1394 break;
1395 }
1396 case SO_ATTACH_REUSEPORT_EBPF:
1397 ret = -EINVAL;
1398 if (optlen == sizeof(u32)) {
1399 u32 ufd;
1400
1401 ret = -EFAULT;
1402 if (copy_from_sockptr(dst: &ufd, src: optval, size: sizeof(ufd)))
1403 break;
1404
1405 ret = sk_reuseport_attach_bpf(ufd, sk);
1406 }
1407 break;
1408
1409 case SO_DETACH_REUSEPORT_BPF:
1410 ret = reuseport_detach_prog(sk);
1411 break;
1412
1413 case SO_DETACH_FILTER:
1414 ret = sk_detach_filter(sk);
1415 break;
1416
1417 case SO_LOCK_FILTER:
1418 if (sock_flag(sk, flag: SOCK_FILTER_LOCKED) && !valbool)
1419 ret = -EPERM;
1420 else
1421 sock_valbool_flag(sk, bit: SOCK_FILTER_LOCKED, valbool);
1422 break;
1423
1424 case SO_MARK:
1425 if (!sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1426 !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1427 ret = -EPERM;
1428 break;
1429 }
1430
1431 __sock_set_mark(sk, val);
1432 break;
1433 case SO_RCVMARK:
1434 sock_valbool_flag(sk, bit: SOCK_RCVMARK, valbool);
1435 break;
1436
1437 case SO_RXQ_OVFL:
1438 sock_valbool_flag(sk, bit: SOCK_RXQ_OVFL, valbool);
1439 break;
1440
1441 case SO_WIFI_STATUS:
1442 sock_valbool_flag(sk, bit: SOCK_WIFI_STATUS, valbool);
1443 break;
1444
1445 case SO_NOFCS:
1446 sock_valbool_flag(sk, bit: SOCK_NOFCS, valbool);
1447 break;
1448
1449 case SO_SELECT_ERR_QUEUE:
1450 sock_valbool_flag(sk, bit: SOCK_SELECT_ERR_QUEUE, valbool);
1451 break;
1452
1453
1454 case SO_INCOMING_CPU:
1455 reuseport_update_incoming_cpu(sk, val);
1456 break;
1457
1458 case SO_CNX_ADVICE:
1459 if (val == 1)
1460 dst_negative_advice(sk);
1461 break;
1462
1463 case SO_ZEROCOPY:
1464 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) {
1465 if (!(sk_is_tcp(sk) ||
1466 (sk->sk_type == SOCK_DGRAM &&
1467 sk->sk_protocol == IPPROTO_UDP)))
1468 ret = -EOPNOTSUPP;
1469 } else if (sk->sk_family != PF_RDS) {
1470 ret = -EOPNOTSUPP;
1471 }
1472 if (!ret) {
1473 if (val < 0 || val > 1)
1474 ret = -EINVAL;
1475 else
1476 sock_valbool_flag(sk, bit: SOCK_ZEROCOPY, valbool);
1477 }
1478 break;
1479
1480 case SO_TXTIME:
1481 if (optlen != sizeof(struct sock_txtime)) {
1482 ret = -EINVAL;
1483 break;
1484 } else if (copy_from_sockptr(dst: &sk_txtime, src: optval,
1485 size: sizeof(struct sock_txtime))) {
1486 ret = -EFAULT;
1487 break;
1488 } else if (sk_txtime.flags & ~SOF_TXTIME_FLAGS_MASK) {
1489 ret = -EINVAL;
1490 break;
1491 }
1492 /* CLOCK_MONOTONIC is only used by sch_fq, and this packet
1493 * scheduler has enough safe guards.
1494 */
1495 if (sk_txtime.clockid != CLOCK_MONOTONIC &&
1496 !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1497 ret = -EPERM;
1498 break;
1499 }
1500 sock_valbool_flag(sk, bit: SOCK_TXTIME, valbool: true);
1501 sk->sk_clockid = sk_txtime.clockid;
1502 sk->sk_txtime_deadline_mode =
1503 !!(sk_txtime.flags & SOF_TXTIME_DEADLINE_MODE);
1504 sk->sk_txtime_report_errors =
1505 !!(sk_txtime.flags & SOF_TXTIME_REPORT_ERRORS);
1506 break;
1507
1508 case SO_BINDTOIFINDEX:
1509 ret = sock_bindtoindex_locked(sk, ifindex: val);
1510 break;
1511
1512 case SO_BUF_LOCK:
1513 if (val & ~SOCK_BUF_LOCK_MASK) {
1514 ret = -EINVAL;
1515 break;
1516 }
1517 sk->sk_userlocks = val | (sk->sk_userlocks &
1518 ~SOCK_BUF_LOCK_MASK);
1519 break;
1520
1521 case SO_RESERVE_MEM:
1522 {
1523 int delta;
1524
1525 if (val < 0) {
1526 ret = -EINVAL;
1527 break;
1528 }
1529
1530 delta = val - sk->sk_reserved_mem;
1531 if (delta < 0)
1532 sock_release_reserved_memory(sk, bytes: -delta);
1533 else
1534 ret = sock_reserve_memory(sk, bytes: delta);
1535 break;
1536 }
1537
1538 default:
1539 ret = -ENOPROTOOPT;
1540 break;
1541 }
1542 sockopt_release_sock(sk);
1543 return ret;
1544}
1545
1546int sock_setsockopt(struct socket *sock, int level, int optname,
1547 sockptr_t optval, unsigned int optlen)
1548{
1549 return sk_setsockopt(sk: sock->sk, level, optname,
1550 optval, optlen);
1551}
1552EXPORT_SYMBOL(sock_setsockopt);
1553
1554static const struct cred *sk_get_peer_cred(struct sock *sk)
1555{
1556 const struct cred *cred;
1557
1558 spin_lock(lock: &sk->sk_peer_lock);
1559 cred = get_cred(cred: sk->sk_peer_cred);
1560 spin_unlock(lock: &sk->sk_peer_lock);
1561
1562 return cred;
1563}
1564
1565static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1566 struct ucred *ucred)
1567{
1568 ucred->pid = pid_vnr(pid);
1569 ucred->uid = ucred->gid = -1;
1570 if (cred) {
1571 struct user_namespace *current_ns = current_user_ns();
1572
1573 ucred->uid = from_kuid_munged(to: current_ns, uid: cred->euid);
1574 ucred->gid = from_kgid_munged(to: current_ns, gid: cred->egid);
1575 }
1576}
1577
1578static int groups_to_user(sockptr_t dst, const struct group_info *src)
1579{
1580 struct user_namespace *user_ns = current_user_ns();
1581 int i;
1582
1583 for (i = 0; i < src->ngroups; i++) {
1584 gid_t gid = from_kgid_munged(to: user_ns, gid: src->gid[i]);
1585
1586 if (copy_to_sockptr_offset(dst, offset: i * sizeof(gid), src: &gid, size: sizeof(gid)))
1587 return -EFAULT;
1588 }
1589
1590 return 0;
1591}
1592
1593int sk_getsockopt(struct sock *sk, int level, int optname,
1594 sockptr_t optval, sockptr_t optlen)
1595{
1596 struct socket *sock = sk->sk_socket;
1597
1598 union {
1599 int val;
1600 u64 val64;
1601 unsigned long ulval;
1602 struct linger ling;
1603 struct old_timeval32 tm32;
1604 struct __kernel_old_timeval tm;
1605 struct __kernel_sock_timeval stm;
1606 struct sock_txtime txtime;
1607 struct so_timestamping timestamping;
1608 } v;
1609
1610 int lv = sizeof(int);
1611 int len;
1612
1613 if (copy_from_sockptr(dst: &len, src: optlen, size: sizeof(int)))
1614 return -EFAULT;
1615 if (len < 0)
1616 return -EINVAL;
1617
1618 memset(&v, 0, sizeof(v));
1619
1620 switch (optname) {
1621 case SO_DEBUG:
1622 v.val = sock_flag(sk, flag: SOCK_DBG);
1623 break;
1624
1625 case SO_DONTROUTE:
1626 v.val = sock_flag(sk, flag: SOCK_LOCALROUTE);
1627 break;
1628
1629 case SO_BROADCAST:
1630 v.val = sock_flag(sk, flag: SOCK_BROADCAST);
1631 break;
1632
1633 case SO_SNDBUF:
1634 v.val = READ_ONCE(sk->sk_sndbuf);
1635 break;
1636
1637 case SO_RCVBUF:
1638 v.val = READ_ONCE(sk->sk_rcvbuf);
1639 break;
1640
1641 case SO_REUSEADDR:
1642 v.val = sk->sk_reuse;
1643 break;
1644
1645 case SO_REUSEPORT:
1646 v.val = sk->sk_reuseport;
1647 break;
1648
1649 case SO_KEEPALIVE:
1650 v.val = sock_flag(sk, flag: SOCK_KEEPOPEN);
1651 break;
1652
1653 case SO_TYPE:
1654 v.val = sk->sk_type;
1655 break;
1656
1657 case SO_PROTOCOL:
1658 v.val = sk->sk_protocol;
1659 break;
1660
1661 case SO_DOMAIN:
1662 v.val = sk->sk_family;
1663 break;
1664
1665 case SO_ERROR:
1666 v.val = -sock_error(sk);
1667 if (v.val == 0)
1668 v.val = xchg(&sk->sk_err_soft, 0);
1669 break;
1670
1671 case SO_OOBINLINE:
1672 v.val = sock_flag(sk, flag: SOCK_URGINLINE);
1673 break;
1674
1675 case SO_NO_CHECK:
1676 v.val = sk->sk_no_check_tx;
1677 break;
1678
1679 case SO_PRIORITY:
1680 v.val = READ_ONCE(sk->sk_priority);
1681 break;
1682
1683 case SO_LINGER:
1684 lv = sizeof(v.ling);
1685 v.ling.l_onoff = sock_flag(sk, flag: SOCK_LINGER);
1686 v.ling.l_linger = READ_ONCE(sk->sk_lingertime) / HZ;
1687 break;
1688
1689 case SO_BSDCOMPAT:
1690 break;
1691
1692 case SO_TIMESTAMP_OLD:
1693 v.val = sock_flag(sk, flag: SOCK_RCVTSTAMP) &&
1694 !sock_flag(sk, flag: SOCK_TSTAMP_NEW) &&
1695 !sock_flag(sk, flag: SOCK_RCVTSTAMPNS);
1696 break;
1697
1698 case SO_TIMESTAMPNS_OLD:
1699 v.val = sock_flag(sk, flag: SOCK_RCVTSTAMPNS) && !sock_flag(sk, flag: SOCK_TSTAMP_NEW);
1700 break;
1701
1702 case SO_TIMESTAMP_NEW:
1703 v.val = sock_flag(sk, flag: SOCK_RCVTSTAMP) && sock_flag(sk, flag: SOCK_TSTAMP_NEW);
1704 break;
1705
1706 case SO_TIMESTAMPNS_NEW:
1707 v.val = sock_flag(sk, flag: SOCK_RCVTSTAMPNS) && sock_flag(sk, flag: SOCK_TSTAMP_NEW);
1708 break;
1709
1710 case SO_TIMESTAMPING_OLD:
1711 case SO_TIMESTAMPING_NEW:
1712 lv = sizeof(v.timestamping);
1713 /* For the later-added case SO_TIMESTAMPING_NEW: Be strict about only
1714 * returning the flags when they were set through the same option.
1715 * Don't change the beviour for the old case SO_TIMESTAMPING_OLD.
1716 */
1717 if (optname == SO_TIMESTAMPING_OLD || sock_flag(sk, flag: SOCK_TSTAMP_NEW)) {
1718 v.timestamping.flags = READ_ONCE(sk->sk_tsflags);
1719 v.timestamping.bind_phc = READ_ONCE(sk->sk_bind_phc);
1720 }
1721 break;
1722
1723 case SO_RCVTIMEO_OLD:
1724 case SO_RCVTIMEO_NEW:
1725 lv = sock_get_timeout(READ_ONCE(sk->sk_rcvtimeo), &v,
1726 SO_RCVTIMEO_OLD == optname);
1727 break;
1728
1729 case SO_SNDTIMEO_OLD:
1730 case SO_SNDTIMEO_NEW:
1731 lv = sock_get_timeout(READ_ONCE(sk->sk_sndtimeo), &v,
1732 SO_SNDTIMEO_OLD == optname);
1733 break;
1734
1735 case SO_RCVLOWAT:
1736 v.val = READ_ONCE(sk->sk_rcvlowat);
1737 break;
1738
1739 case SO_SNDLOWAT:
1740 v.val = 1;
1741 break;
1742
1743 case SO_PASSCRED:
1744 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1745 break;
1746
1747 case SO_PASSPIDFD:
1748 v.val = !!test_bit(SOCK_PASSPIDFD, &sock->flags);
1749 break;
1750
1751 case SO_PEERCRED:
1752 {
1753 struct ucred peercred;
1754 if (len > sizeof(peercred))
1755 len = sizeof(peercred);
1756
1757 spin_lock(lock: &sk->sk_peer_lock);
1758 cred_to_ucred(pid: sk->sk_peer_pid, cred: sk->sk_peer_cred, ucred: &peercred);
1759 spin_unlock(lock: &sk->sk_peer_lock);
1760
1761 if (copy_to_sockptr(dst: optval, src: &peercred, size: len))
1762 return -EFAULT;
1763 goto lenout;
1764 }
1765
1766 case SO_PEERPIDFD:
1767 {
1768 struct pid *peer_pid;
1769 struct file *pidfd_file = NULL;
1770 int pidfd;
1771
1772 if (len > sizeof(pidfd))
1773 len = sizeof(pidfd);
1774
1775 spin_lock(lock: &sk->sk_peer_lock);
1776 peer_pid = get_pid(pid: sk->sk_peer_pid);
1777 spin_unlock(lock: &sk->sk_peer_lock);
1778
1779 if (!peer_pid)
1780 return -ENODATA;
1781
1782 pidfd = pidfd_prepare(pid: peer_pid, flags: 0, ret: &pidfd_file);
1783 put_pid(pid: peer_pid);
1784 if (pidfd < 0)
1785 return pidfd;
1786
1787 if (copy_to_sockptr(dst: optval, src: &pidfd, size: len) ||
1788 copy_to_sockptr(dst: optlen, src: &len, size: sizeof(int))) {
1789 put_unused_fd(fd: pidfd);
1790 fput(pidfd_file);
1791
1792 return -EFAULT;
1793 }
1794
1795 fd_install(fd: pidfd, file: pidfd_file);
1796 return 0;
1797 }
1798
1799 case SO_PEERGROUPS:
1800 {
1801 const struct cred *cred;
1802 int ret, n;
1803
1804 cred = sk_get_peer_cred(sk);
1805 if (!cred)
1806 return -ENODATA;
1807
1808 n = cred->group_info->ngroups;
1809 if (len < n * sizeof(gid_t)) {
1810 len = n * sizeof(gid_t);
1811 put_cred(cred);
1812 return copy_to_sockptr(dst: optlen, src: &len, size: sizeof(int)) ? -EFAULT : -ERANGE;
1813 }
1814 len = n * sizeof(gid_t);
1815
1816 ret = groups_to_user(dst: optval, src: cred->group_info);
1817 put_cred(cred);
1818 if (ret)
1819 return ret;
1820 goto lenout;
1821 }
1822
1823 case SO_PEERNAME:
1824 {
1825 struct sockaddr_storage address;
1826
1827 lv = READ_ONCE(sock->ops)->getname(sock, (struct sockaddr *)&address, 2);
1828 if (lv < 0)
1829 return -ENOTCONN;
1830 if (lv < len)
1831 return -EINVAL;
1832 if (copy_to_sockptr(dst: optval, src: &address, size: len))
1833 return -EFAULT;
1834 goto lenout;
1835 }
1836
1837 /* Dubious BSD thing... Probably nobody even uses it, but
1838 * the UNIX standard wants it for whatever reason... -DaveM
1839 */
1840 case SO_ACCEPTCONN:
1841 v.val = sk->sk_state == TCP_LISTEN;
1842 break;
1843
1844 case SO_PASSSEC:
1845 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1846 break;
1847
1848 case SO_PEERSEC:
1849 return security_socket_getpeersec_stream(sock,
1850 optval, optlen, len);
1851
1852 case SO_MARK:
1853 v.val = READ_ONCE(sk->sk_mark);
1854 break;
1855
1856 case SO_RCVMARK:
1857 v.val = sock_flag(sk, flag: SOCK_RCVMARK);
1858 break;
1859
1860 case SO_RXQ_OVFL:
1861 v.val = sock_flag(sk, flag: SOCK_RXQ_OVFL);
1862 break;
1863
1864 case SO_WIFI_STATUS:
1865 v.val = sock_flag(sk, flag: SOCK_WIFI_STATUS);
1866 break;
1867
1868 case SO_PEEK_OFF:
1869 if (!READ_ONCE(sock->ops)->set_peek_off)
1870 return -EOPNOTSUPP;
1871
1872 v.val = READ_ONCE(sk->sk_peek_off);
1873 break;
1874 case SO_NOFCS:
1875 v.val = sock_flag(sk, flag: SOCK_NOFCS);
1876 break;
1877
1878 case SO_BINDTODEVICE:
1879 return sock_getbindtodevice(sk, optval, optlen, len);
1880
1881 case SO_GET_FILTER:
1882 len = sk_get_filter(sk, optval, len);
1883 if (len < 0)
1884 return len;
1885
1886 goto lenout;
1887
1888 case SO_LOCK_FILTER:
1889 v.val = sock_flag(sk, flag: SOCK_FILTER_LOCKED);
1890 break;
1891
1892 case SO_BPF_EXTENSIONS:
1893 v.val = bpf_tell_extensions();
1894 break;
1895
1896 case SO_SELECT_ERR_QUEUE:
1897 v.val = sock_flag(sk, flag: SOCK_SELECT_ERR_QUEUE);
1898 break;
1899
1900#ifdef CONFIG_NET_RX_BUSY_POLL
1901 case SO_BUSY_POLL:
1902 v.val = READ_ONCE(sk->sk_ll_usec);
1903 break;
1904 case SO_PREFER_BUSY_POLL:
1905 v.val = READ_ONCE(sk->sk_prefer_busy_poll);
1906 break;
1907#endif
1908
1909 case SO_MAX_PACING_RATE:
1910 /* The READ_ONCE() pair with the WRITE_ONCE() in sk_setsockopt() */
1911 if (sizeof(v.ulval) != sizeof(v.val) && len >= sizeof(v.ulval)) {
1912 lv = sizeof(v.ulval);
1913 v.ulval = READ_ONCE(sk->sk_max_pacing_rate);
1914 } else {
1915 /* 32bit version */
1916 v.val = min_t(unsigned long, ~0U,
1917 READ_ONCE(sk->sk_max_pacing_rate));
1918 }
1919 break;
1920
1921 case SO_INCOMING_CPU:
1922 v.val = READ_ONCE(sk->sk_incoming_cpu);
1923 break;
1924
1925 case SO_MEMINFO:
1926 {
1927 u32 meminfo[SK_MEMINFO_VARS];
1928
1929 sk_get_meminfo(sk, meminfo);
1930
1931 len = min_t(unsigned int, len, sizeof(meminfo));
1932 if (copy_to_sockptr(dst: optval, src: &meminfo, size: len))
1933 return -EFAULT;
1934
1935 goto lenout;
1936 }
1937
1938#ifdef CONFIG_NET_RX_BUSY_POLL
1939 case SO_INCOMING_NAPI_ID:
1940 v.val = READ_ONCE(sk->sk_napi_id);
1941
1942 /* aggregate non-NAPI IDs down to 0 */
1943 if (v.val < MIN_NAPI_ID)
1944 v.val = 0;
1945
1946 break;
1947#endif
1948
1949 case SO_COOKIE:
1950 lv = sizeof(u64);
1951 if (len < lv)
1952 return -EINVAL;
1953 v.val64 = sock_gen_cookie(sk);
1954 break;
1955
1956 case SO_ZEROCOPY:
1957 v.val = sock_flag(sk, flag: SOCK_ZEROCOPY);
1958 break;
1959
1960 case SO_TXTIME:
1961 lv = sizeof(v.txtime);
1962 v.txtime.clockid = sk->sk_clockid;
1963 v.txtime.flags |= sk->sk_txtime_deadline_mode ?
1964 SOF_TXTIME_DEADLINE_MODE : 0;
1965 v.txtime.flags |= sk->sk_txtime_report_errors ?
1966 SOF_TXTIME_REPORT_ERRORS : 0;
1967 break;
1968
1969 case SO_BINDTOIFINDEX:
1970 v.val = READ_ONCE(sk->sk_bound_dev_if);
1971 break;
1972
1973 case SO_NETNS_COOKIE:
1974 lv = sizeof(u64);
1975 if (len != lv)
1976 return -EINVAL;
1977 v.val64 = sock_net(sk)->net_cookie;
1978 break;
1979
1980 case SO_BUF_LOCK:
1981 v.val = sk->sk_userlocks & SOCK_BUF_LOCK_MASK;
1982 break;
1983
1984 case SO_RESERVE_MEM:
1985 v.val = READ_ONCE(sk->sk_reserved_mem);
1986 break;
1987
1988 case SO_TXREHASH:
1989 /* Paired with WRITE_ONCE() in sk_setsockopt() */
1990 v.val = READ_ONCE(sk->sk_txrehash);
1991 break;
1992
1993 default:
1994 /* We implement the SO_SNDLOWAT etc to not be settable
1995 * (1003.1g 7).
1996 */
1997 return -ENOPROTOOPT;
1998 }
1999
2000 if (len > lv)
2001 len = lv;
2002 if (copy_to_sockptr(dst: optval, src: &v, size: len))
2003 return -EFAULT;
2004lenout:
2005 if (copy_to_sockptr(dst: optlen, src: &len, size: sizeof(int)))
2006 return -EFAULT;
2007 return 0;
2008}
2009
2010/*
2011 * Initialize an sk_lock.
2012 *
2013 * (We also register the sk_lock with the lock validator.)
2014 */
2015static inline void sock_lock_init(struct sock *sk)
2016{
2017 if (sk->sk_kern_sock)
2018 sock_lock_init_class_and_name(
2019 sk,
2020 af_family_kern_slock_key_strings[sk->sk_family],
2021 af_family_kern_slock_keys + sk->sk_family,
2022 af_family_kern_key_strings[sk->sk_family],
2023 af_family_kern_keys + sk->sk_family);
2024 else
2025 sock_lock_init_class_and_name(
2026 sk,
2027 af_family_slock_key_strings[sk->sk_family],
2028 af_family_slock_keys + sk->sk_family,
2029 af_family_key_strings[sk->sk_family],
2030 af_family_keys + sk->sk_family);
2031}
2032
2033/*
2034 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
2035 * even temporarly, because of RCU lookups. sk_node should also be left as is.
2036 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
2037 */
2038static void sock_copy(struct sock *nsk, const struct sock *osk)
2039{
2040 const struct proto *prot = READ_ONCE(osk->sk_prot);
2041#ifdef CONFIG_SECURITY_NETWORK
2042 void *sptr = nsk->sk_security;
2043#endif
2044
2045 /* If we move sk_tx_queue_mapping out of the private section,
2046 * we must check if sk_tx_queue_clear() is called after
2047 * sock_copy() in sk_clone_lock().
2048 */
2049 BUILD_BUG_ON(offsetof(struct sock, sk_tx_queue_mapping) <
2050 offsetof(struct sock, sk_dontcopy_begin) ||
2051 offsetof(struct sock, sk_tx_queue_mapping) >=
2052 offsetof(struct sock, sk_dontcopy_end));
2053
2054 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
2055
2056 unsafe_memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
2057 prot->obj_size - offsetof(struct sock, sk_dontcopy_end),
2058 /* alloc is larger than struct, see sk_prot_alloc() */);
2059
2060#ifdef CONFIG_SECURITY_NETWORK
2061 nsk->sk_security = sptr;
2062 security_sk_clone(sk: osk, newsk: nsk);
2063#endif
2064}
2065
2066static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
2067 int family)
2068{
2069 struct sock *sk;
2070 struct kmem_cache *slab;
2071
2072 slab = prot->slab;
2073 if (slab != NULL) {
2074 sk = kmem_cache_alloc(cachep: slab, flags: priority & ~__GFP_ZERO);
2075 if (!sk)
2076 return sk;
2077 if (want_init_on_alloc(flags: priority))
2078 sk_prot_clear_nulls(sk, size: prot->obj_size);
2079 } else
2080 sk = kmalloc(size: prot->obj_size, flags: priority);
2081
2082 if (sk != NULL) {
2083 if (security_sk_alloc(sk, family, priority))
2084 goto out_free;
2085
2086 if (!try_module_get(module: prot->owner))
2087 goto out_free_sec;
2088 }
2089
2090 return sk;
2091
2092out_free_sec:
2093 security_sk_free(sk);
2094out_free:
2095 if (slab != NULL)
2096 kmem_cache_free(s: slab, objp: sk);
2097 else
2098 kfree(objp: sk);
2099 return NULL;
2100}
2101
2102static void sk_prot_free(struct proto *prot, struct sock *sk)
2103{
2104 struct kmem_cache *slab;
2105 struct module *owner;
2106
2107 owner = prot->owner;
2108 slab = prot->slab;
2109
2110 cgroup_sk_free(skcd: &sk->sk_cgrp_data);
2111 mem_cgroup_sk_free(sk);
2112 security_sk_free(sk);
2113 if (slab != NULL)
2114 kmem_cache_free(s: slab, objp: sk);
2115 else
2116 kfree(objp: sk);
2117 module_put(module: owner);
2118}
2119
2120/**
2121 * sk_alloc - All socket objects are allocated here
2122 * @net: the applicable net namespace
2123 * @family: protocol family
2124 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
2125 * @prot: struct proto associated with this new sock instance
2126 * @kern: is this to be a kernel socket?
2127 */
2128struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
2129 struct proto *prot, int kern)
2130{
2131 struct sock *sk;
2132
2133 sk = sk_prot_alloc(prot, priority: priority | __GFP_ZERO, family);
2134 if (sk) {
2135 sk->sk_family = family;
2136 /*
2137 * See comment in struct sock definition to understand
2138 * why we need sk_prot_creator -acme
2139 */
2140 sk->sk_prot = sk->sk_prot_creator = prot;
2141 sk->sk_kern_sock = kern;
2142 sock_lock_init(sk);
2143 sk->sk_net_refcnt = kern ? 0 : 1;
2144 if (likely(sk->sk_net_refcnt)) {
2145 get_net_track(net, tracker: &sk->ns_tracker, gfp: priority);
2146 sock_inuse_add(net, val: 1);
2147 } else {
2148 __netns_tracker_alloc(net, tracker: &sk->ns_tracker,
2149 refcounted: false, gfp: priority);
2150 }
2151
2152 sock_net_set(sk, net);
2153 refcount_set(r: &sk->sk_wmem_alloc, n: 1);
2154
2155 mem_cgroup_sk_alloc(sk);
2156 cgroup_sk_alloc(skcd: &sk->sk_cgrp_data);
2157 sock_update_classid(skcd: &sk->sk_cgrp_data);
2158 sock_update_netprioidx(skcd: &sk->sk_cgrp_data);
2159 sk_tx_queue_clear(sk);
2160 }
2161
2162 return sk;
2163}
2164EXPORT_SYMBOL(sk_alloc);
2165
2166/* Sockets having SOCK_RCU_FREE will call this function after one RCU
2167 * grace period. This is the case for UDP sockets and TCP listeners.
2168 */
2169static void __sk_destruct(struct rcu_head *head)
2170{
2171 struct sock *sk = container_of(head, struct sock, sk_rcu);
2172 struct sk_filter *filter;
2173
2174 if (sk->sk_destruct)
2175 sk->sk_destruct(sk);
2176
2177 filter = rcu_dereference_check(sk->sk_filter,
2178 refcount_read(&sk->sk_wmem_alloc) == 0);
2179 if (filter) {
2180 sk_filter_uncharge(sk, fp: filter);
2181 RCU_INIT_POINTER(sk->sk_filter, NULL);
2182 }
2183
2184 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
2185
2186#ifdef CONFIG_BPF_SYSCALL
2187 bpf_sk_storage_free(sk);
2188#endif
2189
2190 if (atomic_read(v: &sk->sk_omem_alloc))
2191 pr_debug("%s: optmem leakage (%d bytes) detected\n",
2192 __func__, atomic_read(&sk->sk_omem_alloc));
2193
2194 if (sk->sk_frag.page) {
2195 put_page(page: sk->sk_frag.page);
2196 sk->sk_frag.page = NULL;
2197 }
2198
2199 /* We do not need to acquire sk->sk_peer_lock, we are the last user. */
2200 put_cred(cred: sk->sk_peer_cred);
2201 put_pid(pid: sk->sk_peer_pid);
2202
2203 if (likely(sk->sk_net_refcnt))
2204 put_net_track(net: sock_net(sk), tracker: &sk->ns_tracker);
2205 else
2206 __netns_tracker_free(net: sock_net(sk), tracker: &sk->ns_tracker, refcounted: false);
2207
2208 sk_prot_free(prot: sk->sk_prot_creator, sk);
2209}
2210
2211void sk_destruct(struct sock *sk)
2212{
2213 bool use_call_rcu = sock_flag(sk, flag: SOCK_RCU_FREE);
2214
2215 if (rcu_access_pointer(sk->sk_reuseport_cb)) {
2216 reuseport_detach_sock(sk);
2217 use_call_rcu = true;
2218 }
2219
2220 if (use_call_rcu)
2221 call_rcu(head: &sk->sk_rcu, func: __sk_destruct);
2222 else
2223 __sk_destruct(head: &sk->sk_rcu);
2224}
2225
2226static void __sk_free(struct sock *sk)
2227{
2228 if (likely(sk->sk_net_refcnt))
2229 sock_inuse_add(net: sock_net(sk), val: -1);
2230
2231 if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk)))
2232 sock_diag_broadcast_destroy(sk);
2233 else
2234 sk_destruct(sk);
2235}
2236
2237void sk_free(struct sock *sk)
2238{
2239 /*
2240 * We subtract one from sk_wmem_alloc and can know if
2241 * some packets are still in some tx queue.
2242 * If not null, sock_wfree() will call __sk_free(sk) later
2243 */
2244 if (refcount_dec_and_test(r: &sk->sk_wmem_alloc))
2245 __sk_free(sk);
2246}
2247EXPORT_SYMBOL(sk_free);
2248
2249static void sk_init_common(struct sock *sk)
2250{
2251 skb_queue_head_init(list: &sk->sk_receive_queue);
2252 skb_queue_head_init(list: &sk->sk_write_queue);
2253 skb_queue_head_init(list: &sk->sk_error_queue);
2254
2255 rwlock_init(&sk->sk_callback_lock);
2256 lockdep_set_class_and_name(&sk->sk_receive_queue.lock,
2257 af_rlock_keys + sk->sk_family,
2258 af_family_rlock_key_strings[sk->sk_family]);
2259 lockdep_set_class_and_name(&sk->sk_write_queue.lock,
2260 af_wlock_keys + sk->sk_family,
2261 af_family_wlock_key_strings[sk->sk_family]);
2262 lockdep_set_class_and_name(&sk->sk_error_queue.lock,
2263 af_elock_keys + sk->sk_family,
2264 af_family_elock_key_strings[sk->sk_family]);
2265 lockdep_set_class_and_name(&sk->sk_callback_lock,
2266 af_callback_keys + sk->sk_family,
2267 af_family_clock_key_strings[sk->sk_family]);
2268}
2269
2270/**
2271 * sk_clone_lock - clone a socket, and lock its clone
2272 * @sk: the socket to clone
2273 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
2274 *
2275 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
2276 */
2277struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
2278{
2279 struct proto *prot = READ_ONCE(sk->sk_prot);
2280 struct sk_filter *filter;
2281 bool is_charged = true;
2282 struct sock *newsk;
2283
2284 newsk = sk_prot_alloc(prot, priority, family: sk->sk_family);
2285 if (!newsk)
2286 goto out;
2287
2288 sock_copy(nsk: newsk, osk: sk);
2289
2290 newsk->sk_prot_creator = prot;
2291
2292 /* SANITY */
2293 if (likely(newsk->sk_net_refcnt)) {
2294 get_net_track(net: sock_net(sk: newsk), tracker: &newsk->ns_tracker, gfp: priority);
2295 sock_inuse_add(net: sock_net(sk: newsk), val: 1);
2296 } else {
2297 /* Kernel sockets are not elevating the struct net refcount.
2298 * Instead, use a tracker to more easily detect if a layer
2299 * is not properly dismantling its kernel sockets at netns
2300 * destroy time.
2301 */
2302 __netns_tracker_alloc(net: sock_net(sk: newsk), tracker: &newsk->ns_tracker,
2303 refcounted: false, gfp: priority);
2304 }
2305 sk_node_init(node: &newsk->sk_node);
2306 sock_lock_init(sk: newsk);
2307 bh_lock_sock(newsk);
2308 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
2309 newsk->sk_backlog.len = 0;
2310
2311 atomic_set(v: &newsk->sk_rmem_alloc, i: 0);
2312
2313 /* sk_wmem_alloc set to one (see sk_free() and sock_wfree()) */
2314 refcount_set(r: &newsk->sk_wmem_alloc, n: 1);
2315
2316 atomic_set(v: &newsk->sk_omem_alloc, i: 0);
2317 sk_init_common(sk: newsk);
2318
2319 newsk->sk_dst_cache = NULL;
2320 newsk->sk_dst_pending_confirm = 0;
2321 newsk->sk_wmem_queued = 0;
2322 newsk->sk_forward_alloc = 0;
2323 newsk->sk_reserved_mem = 0;
2324 atomic_set(v: &newsk->sk_drops, i: 0);
2325 newsk->sk_send_head = NULL;
2326 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
2327 atomic_set(v: &newsk->sk_zckey, i: 0);
2328
2329 sock_reset_flag(sk: newsk, flag: SOCK_DONE);
2330
2331 /* sk->sk_memcg will be populated at accept() time */
2332 newsk->sk_memcg = NULL;
2333
2334 cgroup_sk_clone(skcd: &newsk->sk_cgrp_data);
2335
2336 rcu_read_lock();
2337 filter = rcu_dereference(sk->sk_filter);
2338 if (filter != NULL)
2339 /* though it's an empty new sock, the charging may fail
2340 * if sysctl_optmem_max was changed between creation of
2341 * original socket and cloning
2342 */
2343 is_charged = sk_filter_charge(sk: newsk, fp: filter);
2344 RCU_INIT_POINTER(newsk->sk_filter, filter);
2345 rcu_read_unlock();
2346
2347 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
2348 /* We need to make sure that we don't uncharge the new
2349 * socket if we couldn't charge it in the first place
2350 * as otherwise we uncharge the parent's filter.
2351 */
2352 if (!is_charged)
2353 RCU_INIT_POINTER(newsk->sk_filter, NULL);
2354 sk_free_unlock_clone(sk: newsk);
2355 newsk = NULL;
2356 goto out;
2357 }
2358 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
2359
2360 if (bpf_sk_storage_clone(sk, newsk)) {
2361 sk_free_unlock_clone(sk: newsk);
2362 newsk = NULL;
2363 goto out;
2364 }
2365
2366 /* Clear sk_user_data if parent had the pointer tagged
2367 * as not suitable for copying when cloning.
2368 */
2369 if (sk_user_data_is_nocopy(sk: newsk))
2370 newsk->sk_user_data = NULL;
2371
2372 newsk->sk_err = 0;
2373 newsk->sk_err_soft = 0;
2374 newsk->sk_priority = 0;
2375 newsk->sk_incoming_cpu = raw_smp_processor_id();
2376
2377 /* Before updating sk_refcnt, we must commit prior changes to memory
2378 * (Documentation/RCU/rculist_nulls.rst for details)
2379 */
2380 smp_wmb();
2381 refcount_set(r: &newsk->sk_refcnt, n: 2);
2382
2383 sk_set_socket(sk: newsk, NULL);
2384 sk_tx_queue_clear(sk: newsk);
2385 RCU_INIT_POINTER(newsk->sk_wq, NULL);
2386
2387 if (newsk->sk_prot->sockets_allocated)
2388 sk_sockets_allocated_inc(sk: newsk);
2389
2390 if (sock_needs_netstamp(sk) && newsk->sk_flags & SK_FLAGS_TIMESTAMP)
2391 net_enable_timestamp();
2392out:
2393 return newsk;
2394}
2395EXPORT_SYMBOL_GPL(sk_clone_lock);
2396
2397void sk_free_unlock_clone(struct sock *sk)
2398{
2399 /* It is still raw copy of parent, so invalidate
2400 * destructor and make plain sk_free() */
2401 sk->sk_destruct = NULL;
2402 bh_unlock_sock(sk);
2403 sk_free(sk);
2404}
2405EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
2406
2407static u32 sk_dst_gso_max_size(struct sock *sk, struct dst_entry *dst)
2408{
2409 bool is_ipv6 = false;
2410 u32 max_size;
2411
2412#if IS_ENABLED(CONFIG_IPV6)
2413 is_ipv6 = (sk->sk_family == AF_INET6 &&
2414 !ipv6_addr_v4mapped(a: &sk->sk_v6_rcv_saddr));
2415#endif
2416 /* pairs with the WRITE_ONCE() in netif_set_gso(_ipv4)_max_size() */
2417 max_size = is_ipv6 ? READ_ONCE(dst->dev->gso_max_size) :
2418 READ_ONCE(dst->dev->gso_ipv4_max_size);
2419 if (max_size > GSO_LEGACY_MAX_SIZE && !sk_is_tcp(sk))
2420 max_size = GSO_LEGACY_MAX_SIZE;
2421
2422 return max_size - (MAX_TCP_HEADER + 1);
2423}
2424
2425void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
2426{
2427 u32 max_segs = 1;
2428
2429 sk->sk_route_caps = dst->dev->features;
2430 if (sk_is_tcp(sk))
2431 sk->sk_route_caps |= NETIF_F_GSO;
2432 if (sk->sk_route_caps & NETIF_F_GSO)
2433 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
2434 if (unlikely(sk->sk_gso_disabled))
2435 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
2436 if (sk_can_gso(sk)) {
2437 if (dst->header_len && !xfrm_dst_offload_ok(dst)) {
2438 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
2439 } else {
2440 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
2441 sk->sk_gso_max_size = sk_dst_gso_max_size(sk, dst);
2442 /* pairs with the WRITE_ONCE() in netif_set_gso_max_segs() */
2443 max_segs = max_t(u32, READ_ONCE(dst->dev->gso_max_segs), 1);
2444 }
2445 }
2446 sk->sk_gso_max_segs = max_segs;
2447 sk_dst_set(sk, dst);
2448}
2449EXPORT_SYMBOL_GPL(sk_setup_caps);
2450
2451/*
2452 * Simple resource managers for sockets.
2453 */
2454
2455
2456/*
2457 * Write buffer destructor automatically called from kfree_skb.
2458 */
2459void sock_wfree(struct sk_buff *skb)
2460{
2461 struct sock *sk = skb->sk;
2462 unsigned int len = skb->truesize;
2463 bool free;
2464
2465 if (!sock_flag(sk, flag: SOCK_USE_WRITE_QUEUE)) {
2466 if (sock_flag(sk, flag: SOCK_RCU_FREE) &&
2467 sk->sk_write_space == sock_def_write_space) {
2468 rcu_read_lock();
2469 free = refcount_sub_and_test(i: len, r: &sk->sk_wmem_alloc);
2470 sock_def_write_space_wfree(sk);
2471 rcu_read_unlock();
2472 if (unlikely(free))
2473 __sk_free(sk);
2474 return;
2475 }
2476
2477 /*
2478 * Keep a reference on sk_wmem_alloc, this will be released
2479 * after sk_write_space() call
2480 */
2481 WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc));
2482 sk->sk_write_space(sk);
2483 len = 1;
2484 }
2485 /*
2486 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
2487 * could not do because of in-flight packets
2488 */
2489 if (refcount_sub_and_test(i: len, r: &sk->sk_wmem_alloc))
2490 __sk_free(sk);
2491}
2492EXPORT_SYMBOL(sock_wfree);
2493
2494/* This variant of sock_wfree() is used by TCP,
2495 * since it sets SOCK_USE_WRITE_QUEUE.
2496 */
2497void __sock_wfree(struct sk_buff *skb)
2498{
2499 struct sock *sk = skb->sk;
2500
2501 if (refcount_sub_and_test(i: skb->truesize, r: &sk->sk_wmem_alloc))
2502 __sk_free(sk);
2503}
2504
2505void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
2506{
2507 skb_orphan(skb);
2508 skb->sk = sk;
2509#ifdef CONFIG_INET
2510 if (unlikely(!sk_fullsock(sk))) {
2511 skb->destructor = sock_edemux;
2512 sock_hold(sk);
2513 return;
2514 }
2515#endif
2516 skb->destructor = sock_wfree;
2517 skb_set_hash_from_sk(skb, sk);
2518 /*
2519 * We used to take a refcount on sk, but following operation
2520 * is enough to guarantee sk_free() wont free this sock until
2521 * all in-flight packets are completed
2522 */
2523 refcount_add(i: skb->truesize, r: &sk->sk_wmem_alloc);
2524}
2525EXPORT_SYMBOL(skb_set_owner_w);
2526
2527static bool can_skb_orphan_partial(const struct sk_buff *skb)
2528{
2529#ifdef CONFIG_TLS_DEVICE
2530 /* Drivers depend on in-order delivery for crypto offload,
2531 * partial orphan breaks out-of-order-OK logic.
2532 */
2533 if (skb->decrypted)
2534 return false;
2535#endif
2536 return (skb->destructor == sock_wfree ||
2537 (IS_ENABLED(CONFIG_INET) && skb->destructor == tcp_wfree));
2538}
2539
2540/* This helper is used by netem, as it can hold packets in its
2541 * delay queue. We want to allow the owner socket to send more
2542 * packets, as if they were already TX completed by a typical driver.
2543 * But we also want to keep skb->sk set because some packet schedulers
2544 * rely on it (sch_fq for example).
2545 */
2546void skb_orphan_partial(struct sk_buff *skb)
2547{
2548 if (skb_is_tcp_pure_ack(skb))
2549 return;
2550
2551 if (can_skb_orphan_partial(skb) && skb_set_owner_sk_safe(skb, sk: skb->sk))
2552 return;
2553
2554 skb_orphan(skb);
2555}
2556EXPORT_SYMBOL(skb_orphan_partial);
2557
2558/*
2559 * Read buffer destructor automatically called from kfree_skb.
2560 */
2561void sock_rfree(struct sk_buff *skb)
2562{
2563 struct sock *sk = skb->sk;
2564 unsigned int len = skb->truesize;
2565
2566 atomic_sub(i: len, v: &sk->sk_rmem_alloc);
2567 sk_mem_uncharge(sk, size: len);
2568}
2569EXPORT_SYMBOL(sock_rfree);
2570
2571/*
2572 * Buffer destructor for skbs that are not used directly in read or write
2573 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
2574 */
2575void sock_efree(struct sk_buff *skb)
2576{
2577 sock_put(sk: skb->sk);
2578}
2579EXPORT_SYMBOL(sock_efree);
2580
2581/* Buffer destructor for prefetch/receive path where reference count may
2582 * not be held, e.g. for listen sockets.
2583 */
2584#ifdef CONFIG_INET
2585void sock_pfree(struct sk_buff *skb)
2586{
2587 struct sock *sk = skb->sk;
2588
2589 if (!sk_is_refcounted(sk))
2590 return;
2591
2592 if (sk->sk_state == TCP_NEW_SYN_RECV && inet_reqsk(sk)->syncookie) {
2593 inet_reqsk(sk)->rsk_listener = NULL;
2594 reqsk_free(req: inet_reqsk(sk));
2595 return;
2596 }
2597
2598 sock_gen_put(sk);
2599}
2600EXPORT_SYMBOL(sock_pfree);
2601#endif /* CONFIG_INET */
2602
2603kuid_t sock_i_uid(struct sock *sk)
2604{
2605 kuid_t uid;
2606
2607 read_lock_bh(&sk->sk_callback_lock);
2608 uid = sk->sk_socket ? SOCK_INODE(socket: sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
2609 read_unlock_bh(&sk->sk_callback_lock);
2610 return uid;
2611}
2612EXPORT_SYMBOL(sock_i_uid);
2613
2614unsigned long __sock_i_ino(struct sock *sk)
2615{
2616 unsigned long ino;
2617
2618 read_lock(&sk->sk_callback_lock);
2619 ino = sk->sk_socket ? SOCK_INODE(socket: sk->sk_socket)->i_ino : 0;
2620 read_unlock(&sk->sk_callback_lock);
2621 return ino;
2622}
2623EXPORT_SYMBOL(__sock_i_ino);
2624
2625unsigned long sock_i_ino(struct sock *sk)
2626{
2627 unsigned long ino;
2628
2629 local_bh_disable();
2630 ino = __sock_i_ino(sk);
2631 local_bh_enable();
2632 return ino;
2633}
2634EXPORT_SYMBOL(sock_i_ino);
2635
2636/*
2637 * Allocate a skb from the socket's send buffer.
2638 */
2639struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
2640 gfp_t priority)
2641{
2642 if (force ||
2643 refcount_read(r: &sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf)) {
2644 struct sk_buff *skb = alloc_skb(size, priority);
2645
2646 if (skb) {
2647 skb_set_owner_w(skb, sk);
2648 return skb;
2649 }
2650 }
2651 return NULL;
2652}
2653EXPORT_SYMBOL(sock_wmalloc);
2654
2655static void sock_ofree(struct sk_buff *skb)
2656{
2657 struct sock *sk = skb->sk;
2658
2659 atomic_sub(i: skb->truesize, v: &sk->sk_omem_alloc);
2660}
2661
2662struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size,
2663 gfp_t priority)
2664{
2665 struct sk_buff *skb;
2666
2667 /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */
2668 if (atomic_read(v: &sk->sk_omem_alloc) + SKB_TRUESIZE(size) >
2669 READ_ONCE(sock_net(sk)->core.sysctl_optmem_max))
2670 return NULL;
2671
2672 skb = alloc_skb(size, priority);
2673 if (!skb)
2674 return NULL;
2675
2676 atomic_add(i: skb->truesize, v: &sk->sk_omem_alloc);
2677 skb->sk = sk;
2678 skb->destructor = sock_ofree;
2679 return skb;
2680}
2681
2682/*
2683 * Allocate a memory block from the socket's option memory buffer.
2684 */
2685void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
2686{
2687 int optmem_max = READ_ONCE(sock_net(sk)->core.sysctl_optmem_max);
2688
2689 if ((unsigned int)size <= optmem_max &&
2690 atomic_read(v: &sk->sk_omem_alloc) + size < optmem_max) {
2691 void *mem;
2692 /* First do the add, to avoid the race if kmalloc
2693 * might sleep.
2694 */
2695 atomic_add(i: size, v: &sk->sk_omem_alloc);
2696 mem = kmalloc(size, flags: priority);
2697 if (mem)
2698 return mem;
2699 atomic_sub(i: size, v: &sk->sk_omem_alloc);
2700 }
2701 return NULL;
2702}
2703EXPORT_SYMBOL(sock_kmalloc);
2704
2705/* Free an option memory block. Note, we actually want the inline
2706 * here as this allows gcc to detect the nullify and fold away the
2707 * condition entirely.
2708 */
2709static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
2710 const bool nullify)
2711{
2712 if (WARN_ON_ONCE(!mem))
2713 return;
2714 if (nullify)
2715 kfree_sensitive(objp: mem);
2716 else
2717 kfree(objp: mem);
2718 atomic_sub(i: size, v: &sk->sk_omem_alloc);
2719}
2720
2721void sock_kfree_s(struct sock *sk, void *mem, int size)
2722{
2723 __sock_kfree_s(sk, mem, size, nullify: false);
2724}
2725EXPORT_SYMBOL(sock_kfree_s);
2726
2727void sock_kzfree_s(struct sock *sk, void *mem, int size)
2728{
2729 __sock_kfree_s(sk, mem, size, nullify: true);
2730}
2731EXPORT_SYMBOL(sock_kzfree_s);
2732
2733/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
2734 I think, these locks should be removed for datagram sockets.
2735 */
2736static long sock_wait_for_wmem(struct sock *sk, long timeo)
2737{
2738 DEFINE_WAIT(wait);
2739
2740 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2741 for (;;) {
2742 if (!timeo)
2743 break;
2744 if (signal_pending(current))
2745 break;
2746 set_bit(SOCK_NOSPACE, addr: &sk->sk_socket->flags);
2747 prepare_to_wait(wq_head: sk_sleep(sk), wq_entry: &wait, TASK_INTERRUPTIBLE);
2748 if (refcount_read(r: &sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf))
2749 break;
2750 if (READ_ONCE(sk->sk_shutdown) & SEND_SHUTDOWN)
2751 break;
2752 if (READ_ONCE(sk->sk_err))
2753 break;
2754 timeo = schedule_timeout(timeout: timeo);
2755 }
2756 finish_wait(wq_head: sk_sleep(sk), wq_entry: &wait);
2757 return timeo;
2758}
2759
2760
2761/*
2762 * Generic send/receive buffer handlers
2763 */
2764
2765struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
2766 unsigned long data_len, int noblock,
2767 int *errcode, int max_page_order)
2768{
2769 struct sk_buff *skb;
2770 long timeo;
2771 int err;
2772
2773 timeo = sock_sndtimeo(sk, noblock);
2774 for (;;) {
2775 err = sock_error(sk);
2776 if (err != 0)
2777 goto failure;
2778
2779 err = -EPIPE;
2780 if (READ_ONCE(sk->sk_shutdown) & SEND_SHUTDOWN)
2781 goto failure;
2782
2783 if (sk_wmem_alloc_get(sk) < READ_ONCE(sk->sk_sndbuf))
2784 break;
2785
2786 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2787 set_bit(SOCK_NOSPACE, addr: &sk->sk_socket->flags);
2788 err = -EAGAIN;
2789 if (!timeo)
2790 goto failure;
2791 if (signal_pending(current))
2792 goto interrupted;
2793 timeo = sock_wait_for_wmem(sk, timeo);
2794 }
2795 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
2796 errcode, gfp_mask: sk->sk_allocation);
2797 if (skb)
2798 skb_set_owner_w(skb, sk);
2799 return skb;
2800
2801interrupted:
2802 err = sock_intr_errno(timeo);
2803failure:
2804 *errcode = err;
2805 return NULL;
2806}
2807EXPORT_SYMBOL(sock_alloc_send_pskb);
2808
2809int __sock_cmsg_send(struct sock *sk, struct cmsghdr *cmsg,
2810 struct sockcm_cookie *sockc)
2811{
2812 u32 tsflags;
2813
2814 switch (cmsg->cmsg_type) {
2815 case SO_MARK:
2816 if (!ns_capable(ns: sock_net(sk)->user_ns, CAP_NET_RAW) &&
2817 !ns_capable(ns: sock_net(sk)->user_ns, CAP_NET_ADMIN))
2818 return -EPERM;
2819 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2820 return -EINVAL;
2821 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
2822 break;
2823 case SO_TIMESTAMPING_OLD:
2824 case SO_TIMESTAMPING_NEW:
2825 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2826 return -EINVAL;
2827
2828 tsflags = *(u32 *)CMSG_DATA(cmsg);
2829 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
2830 return -EINVAL;
2831
2832 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
2833 sockc->tsflags |= tsflags;
2834 break;
2835 case SCM_TXTIME:
2836 if (!sock_flag(sk, flag: SOCK_TXTIME))
2837 return -EINVAL;
2838 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u64)))
2839 return -EINVAL;
2840 sockc->transmit_time = get_unaligned((u64 *)CMSG_DATA(cmsg));
2841 break;
2842 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
2843 case SCM_RIGHTS:
2844 case SCM_CREDENTIALS:
2845 break;
2846 default:
2847 return -EINVAL;
2848 }
2849 return 0;
2850}
2851EXPORT_SYMBOL(__sock_cmsg_send);
2852
2853int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
2854 struct sockcm_cookie *sockc)
2855{
2856 struct cmsghdr *cmsg;
2857 int ret;
2858
2859 for_each_cmsghdr(cmsg, msg) {
2860 if (!CMSG_OK(msg, cmsg))
2861 return -EINVAL;
2862 if (cmsg->cmsg_level != SOL_SOCKET)
2863 continue;
2864 ret = __sock_cmsg_send(sk, cmsg, sockc);
2865 if (ret)
2866 return ret;
2867 }
2868 return 0;
2869}
2870EXPORT_SYMBOL(sock_cmsg_send);
2871
2872static void sk_enter_memory_pressure(struct sock *sk)
2873{
2874 if (!sk->sk_prot->enter_memory_pressure)
2875 return;
2876
2877 sk->sk_prot->enter_memory_pressure(sk);
2878}
2879
2880static void sk_leave_memory_pressure(struct sock *sk)
2881{
2882 if (sk->sk_prot->leave_memory_pressure) {
2883 INDIRECT_CALL_INET_1(sk->sk_prot->leave_memory_pressure,
2884 tcp_leave_memory_pressure, sk);
2885 } else {
2886 unsigned long *memory_pressure = sk->sk_prot->memory_pressure;
2887
2888 if (memory_pressure && READ_ONCE(*memory_pressure))
2889 WRITE_ONCE(*memory_pressure, 0);
2890 }
2891}
2892
2893DEFINE_STATIC_KEY_FALSE(net_high_order_alloc_disable_key);
2894
2895/**
2896 * skb_page_frag_refill - check that a page_frag contains enough room
2897 * @sz: minimum size of the fragment we want to get
2898 * @pfrag: pointer to page_frag
2899 * @gfp: priority for memory allocation
2900 *
2901 * Note: While this allocator tries to use high order pages, there is
2902 * no guarantee that allocations succeed. Therefore, @sz MUST be
2903 * less or equal than PAGE_SIZE.
2904 */
2905bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
2906{
2907 if (pfrag->page) {
2908 if (page_ref_count(page: pfrag->page) == 1) {
2909 pfrag->offset = 0;
2910 return true;
2911 }
2912 if (pfrag->offset + sz <= pfrag->size)
2913 return true;
2914 put_page(page: pfrag->page);
2915 }
2916
2917 pfrag->offset = 0;
2918 if (SKB_FRAG_PAGE_ORDER &&
2919 !static_branch_unlikely(&net_high_order_alloc_disable_key)) {
2920 /* Avoid direct reclaim but allow kswapd to wake */
2921 pfrag->page = alloc_pages(gfp: (gfp & ~__GFP_DIRECT_RECLAIM) |
2922 __GFP_COMP | __GFP_NOWARN |
2923 __GFP_NORETRY,
2924 SKB_FRAG_PAGE_ORDER);
2925 if (likely(pfrag->page)) {
2926 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
2927 return true;
2928 }
2929 }
2930 pfrag->page = alloc_page(gfp);
2931 if (likely(pfrag->page)) {
2932 pfrag->size = PAGE_SIZE;
2933 return true;
2934 }
2935 return false;
2936}
2937EXPORT_SYMBOL(skb_page_frag_refill);
2938
2939bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2940{
2941 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2942 return true;
2943
2944 sk_enter_memory_pressure(sk);
2945 sk_stream_moderate_sndbuf(sk);
2946 return false;
2947}
2948EXPORT_SYMBOL(sk_page_frag_refill);
2949
2950void __lock_sock(struct sock *sk)
2951 __releases(&sk->sk_lock.slock)
2952 __acquires(&sk->sk_lock.slock)
2953{
2954 DEFINE_WAIT(wait);
2955
2956 for (;;) {
2957 prepare_to_wait_exclusive(wq_head: &sk->sk_lock.wq, wq_entry: &wait,
2958 TASK_UNINTERRUPTIBLE);
2959 spin_unlock_bh(lock: &sk->sk_lock.slock);
2960 schedule();
2961 spin_lock_bh(lock: &sk->sk_lock.slock);
2962 if (!sock_owned_by_user(sk))
2963 break;
2964 }
2965 finish_wait(wq_head: &sk->sk_lock.wq, wq_entry: &wait);
2966}
2967
2968void __release_sock(struct sock *sk)
2969 __releases(&sk->sk_lock.slock)
2970 __acquires(&sk->sk_lock.slock)
2971{
2972 struct sk_buff *skb, *next;
2973
2974 while ((skb = sk->sk_backlog.head) != NULL) {
2975 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
2976
2977 spin_unlock_bh(lock: &sk->sk_lock.slock);
2978
2979 do {
2980 next = skb->next;
2981 prefetch(next);
2982 DEBUG_NET_WARN_ON_ONCE(skb_dst_is_noref(skb));
2983 skb_mark_not_on_list(skb);
2984 sk_backlog_rcv(sk, skb);
2985
2986 cond_resched();
2987
2988 skb = next;
2989 } while (skb != NULL);
2990
2991 spin_lock_bh(lock: &sk->sk_lock.slock);
2992 }
2993
2994 /*
2995 * Doing the zeroing here guarantee we can not loop forever
2996 * while a wild producer attempts to flood us.
2997 */
2998 sk->sk_backlog.len = 0;
2999}
3000
3001void __sk_flush_backlog(struct sock *sk)
3002{
3003 spin_lock_bh(lock: &sk->sk_lock.slock);
3004 __release_sock(sk);
3005
3006 if (sk->sk_prot->release_cb)
3007 INDIRECT_CALL_INET_1(sk->sk_prot->release_cb,
3008 tcp_release_cb, sk);
3009
3010 spin_unlock_bh(lock: &sk->sk_lock.slock);
3011}
3012EXPORT_SYMBOL_GPL(__sk_flush_backlog);
3013
3014/**
3015 * sk_wait_data - wait for data to arrive at sk_receive_queue
3016 * @sk: sock to wait on
3017 * @timeo: for how long
3018 * @skb: last skb seen on sk_receive_queue
3019 *
3020 * Now socket state including sk->sk_err is changed only under lock,
3021 * hence we may omit checks after joining wait queue.
3022 * We check receive queue before schedule() only as optimization;
3023 * it is very likely that release_sock() added new data.
3024 */
3025int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
3026{
3027 DEFINE_WAIT_FUNC(wait, woken_wake_function);
3028 int rc;
3029
3030 add_wait_queue(wq_head: sk_sleep(sk), wq_entry: &wait);
3031 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
3032 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
3033 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
3034 remove_wait_queue(wq_head: sk_sleep(sk), wq_entry: &wait);
3035 return rc;
3036}
3037EXPORT_SYMBOL(sk_wait_data);
3038
3039/**
3040 * __sk_mem_raise_allocated - increase memory_allocated
3041 * @sk: socket
3042 * @size: memory size to allocate
3043 * @amt: pages to allocate
3044 * @kind: allocation type
3045 *
3046 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc.
3047 *
3048 * Unlike the globally shared limits among the sockets under same protocol,
3049 * consuming the budget of a memcg won't have direct effect on other ones.
3050 * So be optimistic about memcg's tolerance, and leave the callers to decide
3051 * whether or not to raise allocated through sk_under_memory_pressure() or
3052 * its variants.
3053 */
3054int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
3055{
3056 struct mem_cgroup *memcg = mem_cgroup_sockets_enabled ? sk->sk_memcg : NULL;
3057 struct proto *prot = sk->sk_prot;
3058 bool charged = false;
3059 long allocated;
3060
3061 sk_memory_allocated_add(sk, amt);
3062 allocated = sk_memory_allocated(sk);
3063
3064 if (memcg) {
3065 if (!mem_cgroup_charge_skmem(memcg, nr_pages: amt, gfp_mask: gfp_memcg_charge()))
3066 goto suppress_allocation;
3067 charged = true;
3068 }
3069
3070 /* Under limit. */
3071 if (allocated <= sk_prot_mem_limits(sk, index: 0)) {
3072 sk_leave_memory_pressure(sk);
3073 return 1;
3074 }
3075
3076 /* Under pressure. */
3077 if (allocated > sk_prot_mem_limits(sk, index: 1))
3078 sk_enter_memory_pressure(sk);
3079
3080 /* Over hard limit. */
3081 if (allocated > sk_prot_mem_limits(sk, index: 2))
3082 goto suppress_allocation;
3083
3084 /* Guarantee minimum buffer size under pressure (either global
3085 * or memcg) to make sure features described in RFC 7323 (TCP
3086 * Extensions for High Performance) work properly.
3087 *
3088 * This rule does NOT stand when exceeds global or memcg's hard
3089 * limit, or else a DoS attack can be taken place by spawning
3090 * lots of sockets whose usage are under minimum buffer size.
3091 */
3092 if (kind == SK_MEM_RECV) {
3093 if (atomic_read(v: &sk->sk_rmem_alloc) < sk_get_rmem0(sk, proto: prot))
3094 return 1;
3095
3096 } else { /* SK_MEM_SEND */
3097 int wmem0 = sk_get_wmem0(sk, proto: prot);
3098
3099 if (sk->sk_type == SOCK_STREAM) {
3100 if (sk->sk_wmem_queued < wmem0)
3101 return 1;
3102 } else if (refcount_read(r: &sk->sk_wmem_alloc) < wmem0) {
3103 return 1;
3104 }
3105 }
3106
3107 if (sk_has_memory_pressure(sk)) {
3108 u64 alloc;
3109
3110 /* The following 'average' heuristic is within the
3111 * scope of global accounting, so it only makes
3112 * sense for global memory pressure.
3113 */
3114 if (!sk_under_global_memory_pressure(sk))
3115 return 1;
3116
3117 /* Try to be fair among all the sockets under global
3118 * pressure by allowing the ones that below average
3119 * usage to raise.
3120 */
3121 alloc = sk_sockets_allocated_read_positive(sk);
3122 if (sk_prot_mem_limits(sk, index: 2) > alloc *
3123 sk_mem_pages(amt: sk->sk_wmem_queued +
3124 atomic_read(v: &sk->sk_rmem_alloc) +
3125 sk->sk_forward_alloc))
3126 return 1;
3127 }
3128
3129suppress_allocation:
3130
3131 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
3132 sk_stream_moderate_sndbuf(sk);
3133
3134 /* Fail only if socket is _under_ its sndbuf.
3135 * In this case we cannot block, so that we have to fail.
3136 */
3137 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) {
3138 /* Force charge with __GFP_NOFAIL */
3139 if (memcg && !charged) {
3140 mem_cgroup_charge_skmem(memcg, nr_pages: amt,
3141 gfp_mask: gfp_memcg_charge() | __GFP_NOFAIL);
3142 }
3143 return 1;
3144 }
3145 }
3146
3147 if (kind == SK_MEM_SEND || (kind == SK_MEM_RECV && charged))
3148 trace_sock_exceed_buf_limit(sk, prot, allocated, kind);
3149
3150 sk_memory_allocated_sub(sk, amt);
3151
3152 if (charged)
3153 mem_cgroup_uncharge_skmem(memcg, nr_pages: amt);
3154
3155 return 0;
3156}
3157
3158/**
3159 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
3160 * @sk: socket
3161 * @size: memory size to allocate
3162 * @kind: allocation type
3163 *
3164 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
3165 * rmem allocation. This function assumes that protocols which have
3166 * memory_pressure use sk_wmem_queued as write buffer accounting.
3167 */
3168int __sk_mem_schedule(struct sock *sk, int size, int kind)
3169{
3170 int ret, amt = sk_mem_pages(amt: size);
3171
3172 sk_forward_alloc_add(sk, val: amt << PAGE_SHIFT);
3173 ret = __sk_mem_raise_allocated(sk, size, amt, kind);
3174 if (!ret)
3175 sk_forward_alloc_add(sk, val: -(amt << PAGE_SHIFT));
3176 return ret;
3177}
3178EXPORT_SYMBOL(__sk_mem_schedule);
3179
3180/**
3181 * __sk_mem_reduce_allocated - reclaim memory_allocated
3182 * @sk: socket
3183 * @amount: number of quanta
3184 *
3185 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
3186 */
3187void __sk_mem_reduce_allocated(struct sock *sk, int amount)
3188{
3189 sk_memory_allocated_sub(sk, amt: amount);
3190
3191 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
3192 mem_cgroup_uncharge_skmem(memcg: sk->sk_memcg, nr_pages: amount);
3193
3194 if (sk_under_global_memory_pressure(sk) &&
3195 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, index: 0)))
3196 sk_leave_memory_pressure(sk);
3197}
3198
3199/**
3200 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
3201 * @sk: socket
3202 * @amount: number of bytes (rounded down to a PAGE_SIZE multiple)
3203 */
3204void __sk_mem_reclaim(struct sock *sk, int amount)
3205{
3206 amount >>= PAGE_SHIFT;
3207 sk_forward_alloc_add(sk, val: -(amount << PAGE_SHIFT));
3208 __sk_mem_reduce_allocated(sk, amount);
3209}
3210EXPORT_SYMBOL(__sk_mem_reclaim);
3211
3212int sk_set_peek_off(struct sock *sk, int val)
3213{
3214 WRITE_ONCE(sk->sk_peek_off, val);
3215 return 0;
3216}
3217EXPORT_SYMBOL_GPL(sk_set_peek_off);
3218
3219/*
3220 * Set of default routines for initialising struct proto_ops when
3221 * the protocol does not support a particular function. In certain
3222 * cases where it makes no sense for a protocol to have a "do nothing"
3223 * function, some default processing is provided.
3224 */
3225
3226int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
3227{
3228 return -EOPNOTSUPP;
3229}
3230EXPORT_SYMBOL(sock_no_bind);
3231
3232int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
3233 int len, int flags)
3234{
3235 return -EOPNOTSUPP;
3236}
3237EXPORT_SYMBOL(sock_no_connect);
3238
3239int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
3240{
3241 return -EOPNOTSUPP;
3242}
3243EXPORT_SYMBOL(sock_no_socketpair);
3244
3245int sock_no_accept(struct socket *sock, struct socket *newsock, int flags,
3246 bool kern)
3247{
3248 return -EOPNOTSUPP;
3249}
3250EXPORT_SYMBOL(sock_no_accept);
3251
3252int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
3253 int peer)
3254{
3255 return -EOPNOTSUPP;
3256}
3257EXPORT_SYMBOL(sock_no_getname);
3258
3259int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
3260{
3261 return -EOPNOTSUPP;
3262}
3263EXPORT_SYMBOL(sock_no_ioctl);
3264
3265int sock_no_listen(struct socket *sock, int backlog)
3266{
3267 return -EOPNOTSUPP;
3268}
3269EXPORT_SYMBOL(sock_no_listen);
3270
3271int sock_no_shutdown(struct socket *sock, int how)
3272{
3273 return -EOPNOTSUPP;
3274}
3275EXPORT_SYMBOL(sock_no_shutdown);
3276
3277int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
3278{
3279 return -EOPNOTSUPP;
3280}
3281EXPORT_SYMBOL(sock_no_sendmsg);
3282
3283int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len)
3284{
3285 return -EOPNOTSUPP;
3286}
3287EXPORT_SYMBOL(sock_no_sendmsg_locked);
3288
3289int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
3290 int flags)
3291{
3292 return -EOPNOTSUPP;
3293}
3294EXPORT_SYMBOL(sock_no_recvmsg);
3295
3296int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
3297{
3298 /* Mirror missing mmap method error code */
3299 return -ENODEV;
3300}
3301EXPORT_SYMBOL(sock_no_mmap);
3302
3303/*
3304 * When a file is received (via SCM_RIGHTS, etc), we must bump the
3305 * various sock-based usage counts.
3306 */
3307void __receive_sock(struct file *file)
3308{
3309 struct socket *sock;
3310
3311 sock = sock_from_file(file);
3312 if (sock) {
3313 sock_update_netprioidx(skcd: &sock->sk->sk_cgrp_data);
3314 sock_update_classid(skcd: &sock->sk->sk_cgrp_data);
3315 }
3316}
3317
3318/*
3319 * Default Socket Callbacks
3320 */
3321
3322static void sock_def_wakeup(struct sock *sk)
3323{
3324 struct socket_wq *wq;
3325
3326 rcu_read_lock();
3327 wq = rcu_dereference(sk->sk_wq);
3328 if (skwq_has_sleeper(wq))
3329 wake_up_interruptible_all(&wq->wait);
3330 rcu_read_unlock();
3331}
3332
3333static void sock_def_error_report(struct sock *sk)
3334{
3335 struct socket_wq *wq;
3336
3337 rcu_read_lock();
3338 wq = rcu_dereference(sk->sk_wq);
3339 if (skwq_has_sleeper(wq))
3340 wake_up_interruptible_poll(&wq->wait, EPOLLERR);
3341 sk_wake_async(sk, how: SOCK_WAKE_IO, POLL_ERR);
3342 rcu_read_unlock();
3343}
3344
3345void sock_def_readable(struct sock *sk)
3346{
3347 struct socket_wq *wq;
3348
3349 trace_sk_data_ready(sk);
3350
3351 rcu_read_lock();
3352 wq = rcu_dereference(sk->sk_wq);
3353 if (skwq_has_sleeper(wq))
3354 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
3355 EPOLLRDNORM | EPOLLRDBAND);
3356 sk_wake_async(sk, how: SOCK_WAKE_WAITD, POLL_IN);
3357 rcu_read_unlock();
3358}
3359
3360static void sock_def_write_space(struct sock *sk)
3361{
3362 struct socket_wq *wq;
3363
3364 rcu_read_lock();
3365
3366 /* Do not wake up a writer until he can make "significant"
3367 * progress. --DaveM
3368 */
3369 if (sock_writeable(sk)) {
3370 wq = rcu_dereference(sk->sk_wq);
3371 if (skwq_has_sleeper(wq))
3372 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
3373 EPOLLWRNORM | EPOLLWRBAND);
3374
3375 /* Should agree with poll, otherwise some programs break */
3376 sk_wake_async(sk, how: SOCK_WAKE_SPACE, POLL_OUT);
3377 }
3378
3379 rcu_read_unlock();
3380}
3381
3382/* An optimised version of sock_def_write_space(), should only be called
3383 * for SOCK_RCU_FREE sockets under RCU read section and after putting
3384 * ->sk_wmem_alloc.
3385 */
3386static void sock_def_write_space_wfree(struct sock *sk)
3387{
3388 /* Do not wake up a writer until he can make "significant"
3389 * progress. --DaveM
3390 */
3391 if (sock_writeable(sk)) {
3392 struct socket_wq *wq = rcu_dereference(sk->sk_wq);
3393
3394 /* rely on refcount_sub from sock_wfree() */
3395 smp_mb__after_atomic();
3396 if (wq && waitqueue_active(wq_head: &wq->wait))
3397 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
3398 EPOLLWRNORM | EPOLLWRBAND);
3399
3400 /* Should agree with poll, otherwise some programs break */
3401 sk_wake_async(sk, how: SOCK_WAKE_SPACE, POLL_OUT);
3402 }
3403}
3404
3405static void sock_def_destruct(struct sock *sk)
3406{
3407}
3408
3409void sk_send_sigurg(struct sock *sk)
3410{
3411 if (sk->sk_socket && sk->sk_socket->file)
3412 if (send_sigurg(fown: &sk->sk_socket->file->f_owner))
3413 sk_wake_async(sk, how: SOCK_WAKE_URG, POLL_PRI);
3414}
3415EXPORT_SYMBOL(sk_send_sigurg);
3416
3417void sk_reset_timer(struct sock *sk, struct timer_list* timer,
3418 unsigned long expires)
3419{
3420 if (!mod_timer(timer, expires))
3421 sock_hold(sk);
3422}
3423EXPORT_SYMBOL(sk_reset_timer);
3424
3425void sk_stop_timer(struct sock *sk, struct timer_list* timer)
3426{
3427 if (del_timer(timer))
3428 __sock_put(sk);
3429}
3430EXPORT_SYMBOL(sk_stop_timer);
3431
3432void sk_stop_timer_sync(struct sock *sk, struct timer_list *timer)
3433{
3434 if (del_timer_sync(timer))
3435 __sock_put(sk);
3436}
3437EXPORT_SYMBOL(sk_stop_timer_sync);
3438
3439void sock_init_data_uid(struct socket *sock, struct sock *sk, kuid_t uid)
3440{
3441 sk_init_common(sk);
3442 sk->sk_send_head = NULL;
3443
3444 timer_setup(&sk->sk_timer, NULL, 0);
3445
3446 sk->sk_allocation = GFP_KERNEL;
3447 sk->sk_rcvbuf = READ_ONCE(sysctl_rmem_default);
3448 sk->sk_sndbuf = READ_ONCE(sysctl_wmem_default);
3449 sk->sk_state = TCP_CLOSE;
3450 sk->sk_use_task_frag = true;
3451 sk_set_socket(sk, sock);
3452
3453 sock_set_flag(sk, flag: SOCK_ZAPPED);
3454
3455 if (sock) {
3456 sk->sk_type = sock->type;
3457 RCU_INIT_POINTER(sk->sk_wq, &sock->wq);
3458 sock->sk = sk;
3459 } else {
3460 RCU_INIT_POINTER(sk->sk_wq, NULL);
3461 }
3462 sk->sk_uid = uid;
3463
3464 rwlock_init(&sk->sk_callback_lock);
3465 if (sk->sk_kern_sock)
3466 lockdep_set_class_and_name(
3467 &sk->sk_callback_lock,
3468 af_kern_callback_keys + sk->sk_family,
3469 af_family_kern_clock_key_strings[sk->sk_family]);
3470 else
3471 lockdep_set_class_and_name(
3472 &sk->sk_callback_lock,
3473 af_callback_keys + sk->sk_family,
3474 af_family_clock_key_strings[sk->sk_family]);
3475
3476 sk->sk_state_change = sock_def_wakeup;
3477 sk->sk_data_ready = sock_def_readable;
3478 sk->sk_write_space = sock_def_write_space;
3479 sk->sk_error_report = sock_def_error_report;
3480 sk->sk_destruct = sock_def_destruct;
3481
3482 sk->sk_frag.page = NULL;
3483 sk->sk_frag.offset = 0;
3484 sk->sk_peek_off = -1;
3485
3486 sk->sk_peer_pid = NULL;
3487 sk->sk_peer_cred = NULL;
3488 spin_lock_init(&sk->sk_peer_lock);
3489
3490 sk->sk_write_pending = 0;
3491 sk->sk_rcvlowat = 1;
3492 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
3493 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
3494
3495 sk->sk_stamp = SK_DEFAULT_STAMP;
3496#if BITS_PER_LONG==32
3497 seqlock_init(&sk->sk_stamp_seq);
3498#endif
3499 atomic_set(v: &sk->sk_zckey, i: 0);
3500
3501#ifdef CONFIG_NET_RX_BUSY_POLL
3502 sk->sk_napi_id = 0;
3503 sk->sk_ll_usec = READ_ONCE(sysctl_net_busy_read);
3504#endif
3505
3506 sk->sk_max_pacing_rate = ~0UL;
3507 sk->sk_pacing_rate = ~0UL;
3508 WRITE_ONCE(sk->sk_pacing_shift, 10);
3509 sk->sk_incoming_cpu = -1;
3510
3511 sk_rx_queue_clear(sk);
3512 /*
3513 * Before updating sk_refcnt, we must commit prior changes to memory
3514 * (Documentation/RCU/rculist_nulls.rst for details)
3515 */
3516 smp_wmb();
3517 refcount_set(r: &sk->sk_refcnt, n: 1);
3518 atomic_set(v: &sk->sk_drops, i: 0);
3519}
3520EXPORT_SYMBOL(sock_init_data_uid);
3521
3522void sock_init_data(struct socket *sock, struct sock *sk)
3523{
3524 kuid_t uid = sock ?
3525 SOCK_INODE(socket: sock)->i_uid :
3526 make_kuid(from: sock_net(sk)->user_ns, uid: 0);
3527
3528 sock_init_data_uid(sock, sk, uid);
3529}
3530EXPORT_SYMBOL(sock_init_data);
3531
3532void lock_sock_nested(struct sock *sk, int subclass)
3533{
3534 /* The sk_lock has mutex_lock() semantics here. */
3535 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
3536
3537 might_sleep();
3538 spin_lock_bh(lock: &sk->sk_lock.slock);
3539 if (sock_owned_by_user_nocheck(sk))
3540 __lock_sock(sk);
3541 sk->sk_lock.owned = 1;
3542 spin_unlock_bh(lock: &sk->sk_lock.slock);
3543}
3544EXPORT_SYMBOL(lock_sock_nested);
3545
3546void release_sock(struct sock *sk)
3547{
3548 spin_lock_bh(lock: &sk->sk_lock.slock);
3549 if (sk->sk_backlog.tail)
3550 __release_sock(sk);
3551
3552 if (sk->sk_prot->release_cb)
3553 INDIRECT_CALL_INET_1(sk->sk_prot->release_cb,
3554 tcp_release_cb, sk);
3555
3556 sock_release_ownership(sk);
3557 if (waitqueue_active(wq_head: &sk->sk_lock.wq))
3558 wake_up(&sk->sk_lock.wq);
3559 spin_unlock_bh(lock: &sk->sk_lock.slock);
3560}
3561EXPORT_SYMBOL(release_sock);
3562
3563bool __lock_sock_fast(struct sock *sk) __acquires(&sk->sk_lock.slock)
3564{
3565 might_sleep();
3566 spin_lock_bh(lock: &sk->sk_lock.slock);
3567
3568 if (!sock_owned_by_user_nocheck(sk)) {
3569 /*
3570 * Fast path return with bottom halves disabled and
3571 * sock::sk_lock.slock held.
3572 *
3573 * The 'mutex' is not contended and holding
3574 * sock::sk_lock.slock prevents all other lockers to
3575 * proceed so the corresponding unlock_sock_fast() can
3576 * avoid the slow path of release_sock() completely and
3577 * just release slock.
3578 *
3579 * From a semantical POV this is equivalent to 'acquiring'
3580 * the 'mutex', hence the corresponding lockdep
3581 * mutex_release() has to happen in the fast path of
3582 * unlock_sock_fast().
3583 */
3584 return false;
3585 }
3586
3587 __lock_sock(sk);
3588 sk->sk_lock.owned = 1;
3589 __acquire(&sk->sk_lock.slock);
3590 spin_unlock_bh(lock: &sk->sk_lock.slock);
3591 return true;
3592}
3593EXPORT_SYMBOL(__lock_sock_fast);
3594
3595int sock_gettstamp(struct socket *sock, void __user *userstamp,
3596 bool timeval, bool time32)
3597{
3598 struct sock *sk = sock->sk;
3599 struct timespec64 ts;
3600
3601 sock_enable_timestamp(sk, flag: SOCK_TIMESTAMP);
3602 ts = ktime_to_timespec64(sock_read_timestamp(sk));
3603 if (ts.tv_sec == -1)
3604 return -ENOENT;
3605 if (ts.tv_sec == 0) {
3606 ktime_t kt = ktime_get_real();
3607 sock_write_timestamp(sk, kt);
3608 ts = ktime_to_timespec64(kt);
3609 }
3610
3611 if (timeval)
3612 ts.tv_nsec /= 1000;
3613
3614#ifdef CONFIG_COMPAT_32BIT_TIME
3615 if (time32)
3616 return put_old_timespec32(&ts, userstamp);
3617#endif
3618#ifdef CONFIG_SPARC64
3619 /* beware of padding in sparc64 timeval */
3620 if (timeval && !in_compat_syscall()) {
3621 struct __kernel_old_timeval __user tv = {
3622 .tv_sec = ts.tv_sec,
3623 .tv_usec = ts.tv_nsec,
3624 };
3625 if (copy_to_user(userstamp, &tv, sizeof(tv)))
3626 return -EFAULT;
3627 return 0;
3628 }
3629#endif
3630 return put_timespec64(ts: &ts, uts: userstamp);
3631}
3632EXPORT_SYMBOL(sock_gettstamp);
3633
3634void sock_enable_timestamp(struct sock *sk, enum sock_flags flag)
3635{
3636 if (!sock_flag(sk, flag)) {
3637 unsigned long previous_flags = sk->sk_flags;
3638
3639 sock_set_flag(sk, flag);
3640 /*
3641 * we just set one of the two flags which require net
3642 * time stamping, but time stamping might have been on
3643 * already because of the other one
3644 */
3645 if (sock_needs_netstamp(sk) &&
3646 !(previous_flags & SK_FLAGS_TIMESTAMP))
3647 net_enable_timestamp();
3648 }
3649}
3650
3651int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
3652 int level, int type)
3653{
3654 struct sock_exterr_skb *serr;
3655 struct sk_buff *skb;
3656 int copied, err;
3657
3658 err = -EAGAIN;
3659 skb = sock_dequeue_err_skb(sk);
3660 if (skb == NULL)
3661 goto out;
3662
3663 copied = skb->len;
3664 if (copied > len) {
3665 msg->msg_flags |= MSG_TRUNC;
3666 copied = len;
3667 }
3668 err = skb_copy_datagram_msg(from: skb, offset: 0, msg, size: copied);
3669 if (err)
3670 goto out_free_skb;
3671
3672 sock_recv_timestamp(msg, sk, skb);
3673
3674 serr = SKB_EXT_ERR(skb);
3675 put_cmsg(msg, level, type, len: sizeof(serr->ee), data: &serr->ee);
3676
3677 msg->msg_flags |= MSG_ERRQUEUE;
3678 err = copied;
3679
3680out_free_skb:
3681 kfree_skb(skb);
3682out:
3683 return err;
3684}
3685EXPORT_SYMBOL(sock_recv_errqueue);
3686
3687/*
3688 * Get a socket option on an socket.
3689 *
3690 * FIX: POSIX 1003.1g is very ambiguous here. It states that
3691 * asynchronous errors should be reported by getsockopt. We assume
3692 * this means if you specify SO_ERROR (otherwise whats the point of it).
3693 */
3694int sock_common_getsockopt(struct socket *sock, int level, int optname,
3695 char __user *optval, int __user *optlen)
3696{
3697 struct sock *sk = sock->sk;
3698
3699 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
3700 return READ_ONCE(sk->sk_prot)->getsockopt(sk, level, optname, optval, optlen);
3701}
3702EXPORT_SYMBOL(sock_common_getsockopt);
3703
3704int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
3705 int flags)
3706{
3707 struct sock *sk = sock->sk;
3708 int addr_len = 0;
3709 int err;
3710
3711 err = sk->sk_prot->recvmsg(sk, msg, size, flags, &addr_len);
3712 if (err >= 0)
3713 msg->msg_namelen = addr_len;
3714 return err;
3715}
3716EXPORT_SYMBOL(sock_common_recvmsg);
3717
3718/*
3719 * Set socket options on an inet socket.
3720 */
3721int sock_common_setsockopt(struct socket *sock, int level, int optname,
3722 sockptr_t optval, unsigned int optlen)
3723{
3724 struct sock *sk = sock->sk;
3725
3726 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
3727 return READ_ONCE(sk->sk_prot)->setsockopt(sk, level, optname, optval, optlen);
3728}
3729EXPORT_SYMBOL(sock_common_setsockopt);
3730
3731void sk_common_release(struct sock *sk)
3732{
3733 if (sk->sk_prot->destroy)
3734 sk->sk_prot->destroy(sk);
3735
3736 /*
3737 * Observation: when sk_common_release is called, processes have
3738 * no access to socket. But net still has.
3739 * Step one, detach it from networking:
3740 *
3741 * A. Remove from hash tables.
3742 */
3743
3744 sk->sk_prot->unhash(sk);
3745
3746 /*
3747 * In this point socket cannot receive new packets, but it is possible
3748 * that some packets are in flight because some CPU runs receiver and
3749 * did hash table lookup before we unhashed socket. They will achieve
3750 * receive queue and will be purged by socket destructor.
3751 *
3752 * Also we still have packets pending on receive queue and probably,
3753 * our own packets waiting in device queues. sock_destroy will drain
3754 * receive queue, but transmitted packets will delay socket destruction
3755 * until the last reference will be released.
3756 */
3757
3758 sock_orphan(sk);
3759
3760 xfrm_sk_free_policy(sk);
3761
3762 sock_put(sk);
3763}
3764EXPORT_SYMBOL(sk_common_release);
3765
3766void sk_get_meminfo(const struct sock *sk, u32 *mem)
3767{
3768 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
3769
3770 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
3771 mem[SK_MEMINFO_RCVBUF] = READ_ONCE(sk->sk_rcvbuf);
3772 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
3773 mem[SK_MEMINFO_SNDBUF] = READ_ONCE(sk->sk_sndbuf);
3774 mem[SK_MEMINFO_FWD_ALLOC] = sk_forward_alloc_get(sk);
3775 mem[SK_MEMINFO_WMEM_QUEUED] = READ_ONCE(sk->sk_wmem_queued);
3776 mem[SK_MEMINFO_OPTMEM] = atomic_read(v: &sk->sk_omem_alloc);
3777 mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len);
3778 mem[SK_MEMINFO_DROPS] = atomic_read(v: &sk->sk_drops);
3779}
3780
3781#ifdef CONFIG_PROC_FS
3782static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
3783
3784int sock_prot_inuse_get(struct net *net, struct proto *prot)
3785{
3786 int cpu, idx = prot->inuse_idx;
3787 int res = 0;
3788
3789 for_each_possible_cpu(cpu)
3790 res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx];
3791
3792 return res >= 0 ? res : 0;
3793}
3794EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
3795
3796int sock_inuse_get(struct net *net)
3797{
3798 int cpu, res = 0;
3799
3800 for_each_possible_cpu(cpu)
3801 res += per_cpu_ptr(net->core.prot_inuse, cpu)->all;
3802
3803 return res;
3804}
3805
3806EXPORT_SYMBOL_GPL(sock_inuse_get);
3807
3808static int __net_init sock_inuse_init_net(struct net *net)
3809{
3810 net->core.prot_inuse = alloc_percpu(struct prot_inuse);
3811 if (net->core.prot_inuse == NULL)
3812 return -ENOMEM;
3813 return 0;
3814}
3815
3816static void __net_exit sock_inuse_exit_net(struct net *net)
3817{
3818 free_percpu(pdata: net->core.prot_inuse);
3819}
3820
3821static struct pernet_operations net_inuse_ops = {
3822 .init = sock_inuse_init_net,
3823 .exit = sock_inuse_exit_net,
3824};
3825
3826static __init int net_inuse_init(void)
3827{
3828 if (register_pernet_subsys(&net_inuse_ops))
3829 panic(fmt: "Cannot initialize net inuse counters");
3830
3831 return 0;
3832}
3833
3834core_initcall(net_inuse_init);
3835
3836static int assign_proto_idx(struct proto *prot)
3837{
3838 prot->inuse_idx = find_first_zero_bit(addr: proto_inuse_idx, PROTO_INUSE_NR);
3839
3840 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
3841 pr_err("PROTO_INUSE_NR exhausted\n");
3842 return -ENOSPC;
3843 }
3844
3845 set_bit(nr: prot->inuse_idx, addr: proto_inuse_idx);
3846 return 0;
3847}
3848
3849static void release_proto_idx(struct proto *prot)
3850{
3851 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
3852 clear_bit(nr: prot->inuse_idx, addr: proto_inuse_idx);
3853}
3854#else
3855static inline int assign_proto_idx(struct proto *prot)
3856{
3857 return 0;
3858}
3859
3860static inline void release_proto_idx(struct proto *prot)
3861{
3862}
3863
3864#endif
3865
3866static void tw_prot_cleanup(struct timewait_sock_ops *twsk_prot)
3867{
3868 if (!twsk_prot)
3869 return;
3870 kfree(objp: twsk_prot->twsk_slab_name);
3871 twsk_prot->twsk_slab_name = NULL;
3872 kmem_cache_destroy(s: twsk_prot->twsk_slab);
3873 twsk_prot->twsk_slab = NULL;
3874}
3875
3876static int tw_prot_init(const struct proto *prot)
3877{
3878 struct timewait_sock_ops *twsk_prot = prot->twsk_prot;
3879
3880 if (!twsk_prot)
3881 return 0;
3882
3883 twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, fmt: "tw_sock_%s",
3884 prot->name);
3885 if (!twsk_prot->twsk_slab_name)
3886 return -ENOMEM;
3887
3888 twsk_prot->twsk_slab =
3889 kmem_cache_create(name: twsk_prot->twsk_slab_name,
3890 size: twsk_prot->twsk_obj_size, align: 0,
3891 SLAB_ACCOUNT | prot->slab_flags,
3892 NULL);
3893 if (!twsk_prot->twsk_slab) {
3894 pr_crit("%s: Can't create timewait sock SLAB cache!\n",
3895 prot->name);
3896 return -ENOMEM;
3897 }
3898
3899 return 0;
3900}
3901
3902static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
3903{
3904 if (!rsk_prot)
3905 return;
3906 kfree(objp: rsk_prot->slab_name);
3907 rsk_prot->slab_name = NULL;
3908 kmem_cache_destroy(s: rsk_prot->slab);
3909 rsk_prot->slab = NULL;
3910}
3911
3912static int req_prot_init(const struct proto *prot)
3913{
3914 struct request_sock_ops *rsk_prot = prot->rsk_prot;
3915
3916 if (!rsk_prot)
3917 return 0;
3918
3919 rsk_prot->slab_name = kasprintf(GFP_KERNEL, fmt: "request_sock_%s",
3920 prot->name);
3921 if (!rsk_prot->slab_name)
3922 return -ENOMEM;
3923
3924 rsk_prot->slab = kmem_cache_create(name: rsk_prot->slab_name,
3925 size: rsk_prot->obj_size, align: 0,
3926 SLAB_ACCOUNT | prot->slab_flags,
3927 NULL);
3928
3929 if (!rsk_prot->slab) {
3930 pr_crit("%s: Can't create request sock SLAB cache!\n",
3931 prot->name);
3932 return -ENOMEM;
3933 }
3934 return 0;
3935}
3936
3937int proto_register(struct proto *prot, int alloc_slab)
3938{
3939 int ret = -ENOBUFS;
3940
3941 if (prot->memory_allocated && !prot->sysctl_mem) {
3942 pr_err("%s: missing sysctl_mem\n", prot->name);
3943 return -EINVAL;
3944 }
3945 if (prot->memory_allocated && !prot->per_cpu_fw_alloc) {
3946 pr_err("%s: missing per_cpu_fw_alloc\n", prot->name);
3947 return -EINVAL;
3948 }
3949 if (alloc_slab) {
3950 prot->slab = kmem_cache_create_usercopy(name: prot->name,
3951 size: prot->obj_size, align: 0,
3952 SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT |
3953 prot->slab_flags,
3954 useroffset: prot->useroffset, usersize: prot->usersize,
3955 NULL);
3956
3957 if (prot->slab == NULL) {
3958 pr_crit("%s: Can't create sock SLAB cache!\n",
3959 prot->name);
3960 goto out;
3961 }
3962
3963 if (req_prot_init(prot))
3964 goto out_free_request_sock_slab;
3965
3966 if (tw_prot_init(prot))
3967 goto out_free_timewait_sock_slab;
3968 }
3969
3970 mutex_lock(&proto_list_mutex);
3971 ret = assign_proto_idx(prot);
3972 if (ret) {
3973 mutex_unlock(lock: &proto_list_mutex);
3974 goto out_free_timewait_sock_slab;
3975 }
3976 list_add(new: &prot->node, head: &proto_list);
3977 mutex_unlock(lock: &proto_list_mutex);
3978 return ret;
3979
3980out_free_timewait_sock_slab:
3981 if (alloc_slab)
3982 tw_prot_cleanup(twsk_prot: prot->twsk_prot);
3983out_free_request_sock_slab:
3984 if (alloc_slab) {
3985 req_prot_cleanup(rsk_prot: prot->rsk_prot);
3986
3987 kmem_cache_destroy(s: prot->slab);
3988 prot->slab = NULL;
3989 }
3990out:
3991 return ret;
3992}
3993EXPORT_SYMBOL(proto_register);
3994
3995void proto_unregister(struct proto *prot)
3996{
3997 mutex_lock(&proto_list_mutex);
3998 release_proto_idx(prot);
3999 list_del(entry: &prot->node);
4000 mutex_unlock(lock: &proto_list_mutex);
4001
4002 kmem_cache_destroy(s: prot->slab);
4003 prot->slab = NULL;
4004
4005 req_prot_cleanup(rsk_prot: prot->rsk_prot);
4006 tw_prot_cleanup(twsk_prot: prot->twsk_prot);
4007}
4008EXPORT_SYMBOL(proto_unregister);
4009
4010int sock_load_diag_module(int family, int protocol)
4011{
4012 if (!protocol) {
4013 if (!sock_is_registered(family))
4014 return -ENOENT;
4015
4016 return request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
4017 NETLINK_SOCK_DIAG, family);
4018 }
4019
4020#ifdef CONFIG_INET
4021 if (family == AF_INET &&
4022 protocol != IPPROTO_RAW &&
4023 protocol < MAX_INET_PROTOS &&
4024 !rcu_access_pointer(inet_protos[protocol]))
4025 return -ENOENT;
4026#endif
4027
4028 return request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
4029 NETLINK_SOCK_DIAG, family, protocol);
4030}
4031EXPORT_SYMBOL(sock_load_diag_module);
4032
4033#ifdef CONFIG_PROC_FS
4034static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
4035 __acquires(proto_list_mutex)
4036{
4037 mutex_lock(&proto_list_mutex);
4038 return seq_list_start_head(head: &proto_list, pos: *pos);
4039}
4040
4041static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4042{
4043 return seq_list_next(v, head: &proto_list, ppos: pos);
4044}
4045
4046static void proto_seq_stop(struct seq_file *seq, void *v)
4047 __releases(proto_list_mutex)
4048{
4049 mutex_unlock(lock: &proto_list_mutex);
4050}
4051
4052static char proto_method_implemented(const void *method)
4053{
4054 return method == NULL ? 'n' : 'y';
4055}
4056static long sock_prot_memory_allocated(struct proto *proto)
4057{
4058 return proto->memory_allocated != NULL ? proto_memory_allocated(prot: proto) : -1L;
4059}
4060
4061static const char *sock_prot_memory_pressure(struct proto *proto)
4062{
4063 return proto->memory_pressure != NULL ?
4064 proto_memory_pressure(prot: proto) ? "yes" : "no" : "NI";
4065}
4066
4067static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
4068{
4069
4070 seq_printf(m: seq, fmt: "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
4071 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
4072 proto->name,
4073 proto->obj_size,
4074 sock_prot_inuse_get(seq_file_net(seq), proto),
4075 sock_prot_memory_allocated(proto),
4076 sock_prot_memory_pressure(proto),
4077 proto->max_header,
4078 proto->slab == NULL ? "no" : "yes",
4079 module_name(proto->owner),
4080 proto_method_implemented(method: proto->close),
4081 proto_method_implemented(method: proto->connect),
4082 proto_method_implemented(method: proto->disconnect),
4083 proto_method_implemented(method: proto->accept),
4084 proto_method_implemented(method: proto->ioctl),
4085 proto_method_implemented(method: proto->init),
4086 proto_method_implemented(method: proto->destroy),
4087 proto_method_implemented(method: proto->shutdown),
4088 proto_method_implemented(method: proto->setsockopt),
4089 proto_method_implemented(method: proto->getsockopt),
4090 proto_method_implemented(method: proto->sendmsg),
4091 proto_method_implemented(method: proto->recvmsg),
4092 proto_method_implemented(method: proto->bind),
4093 proto_method_implemented(method: proto->backlog_rcv),
4094 proto_method_implemented(method: proto->hash),
4095 proto_method_implemented(method: proto->unhash),
4096 proto_method_implemented(method: proto->get_port),
4097 proto_method_implemented(method: proto->enter_memory_pressure));
4098}
4099
4100static int proto_seq_show(struct seq_file *seq, void *v)
4101{
4102 if (v == &proto_list)
4103 seq_printf(m: seq, fmt: "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
4104 "protocol",
4105 "size",
4106 "sockets",
4107 "memory",
4108 "press",
4109 "maxhdr",
4110 "slab",
4111 "module",
4112 "cl co di ac io in de sh ss gs se re bi br ha uh gp em\n");
4113 else
4114 proto_seq_printf(seq, list_entry(v, struct proto, node));
4115 return 0;
4116}
4117
4118static const struct seq_operations proto_seq_ops = {
4119 .start = proto_seq_start,
4120 .next = proto_seq_next,
4121 .stop = proto_seq_stop,
4122 .show = proto_seq_show,
4123};
4124
4125static __net_init int proto_init_net(struct net *net)
4126{
4127 if (!proc_create_net("protocols", 0444, net->proc_net, &proto_seq_ops,
4128 sizeof(struct seq_net_private)))
4129 return -ENOMEM;
4130
4131 return 0;
4132}
4133
4134static __net_exit void proto_exit_net(struct net *net)
4135{
4136 remove_proc_entry("protocols", net->proc_net);
4137}
4138
4139
4140static __net_initdata struct pernet_operations proto_net_ops = {
4141 .init = proto_init_net,
4142 .exit = proto_exit_net,
4143};
4144
4145static int __init proto_init(void)
4146{
4147 return register_pernet_subsys(&proto_net_ops);
4148}
4149
4150subsys_initcall(proto_init);
4151
4152#endif /* PROC_FS */
4153
4154#ifdef CONFIG_NET_RX_BUSY_POLL
4155bool sk_busy_loop_end(void *p, unsigned long start_time)
4156{
4157 struct sock *sk = p;
4158
4159 if (!skb_queue_empty_lockless(list: &sk->sk_receive_queue))
4160 return true;
4161
4162 if (sk_is_udp(sk) &&
4163 !skb_queue_empty_lockless(list: &udp_sk(sk)->reader_queue))
4164 return true;
4165
4166 return sk_busy_loop_timeout(sk, start_time);
4167}
4168EXPORT_SYMBOL(sk_busy_loop_end);
4169#endif /* CONFIG_NET_RX_BUSY_POLL */
4170
4171int sock_bind_add(struct sock *sk, struct sockaddr *addr, int addr_len)
4172{
4173 if (!sk->sk_prot->bind_add)
4174 return -EOPNOTSUPP;
4175 return sk->sk_prot->bind_add(sk, addr, addr_len);
4176}
4177EXPORT_SYMBOL(sock_bind_add);
4178
4179/* Copy 'size' bytes from userspace and return `size` back to userspace */
4180int sock_ioctl_inout(struct sock *sk, unsigned int cmd,
4181 void __user *arg, void *karg, size_t size)
4182{
4183 int ret;
4184
4185 if (copy_from_user(to: karg, from: arg, n: size))
4186 return -EFAULT;
4187
4188 ret = READ_ONCE(sk->sk_prot)->ioctl(sk, cmd, karg);
4189 if (ret)
4190 return ret;
4191
4192 if (copy_to_user(to: arg, from: karg, n: size))
4193 return -EFAULT;
4194
4195 return 0;
4196}
4197EXPORT_SYMBOL(sock_ioctl_inout);
4198
4199/* This is the most common ioctl prep function, where the result (4 bytes) is
4200 * copied back to userspace if the ioctl() returns successfully. No input is
4201 * copied from userspace as input argument.
4202 */
4203static int sock_ioctl_out(struct sock *sk, unsigned int cmd, void __user *arg)
4204{
4205 int ret, karg = 0;
4206
4207 ret = READ_ONCE(sk->sk_prot)->ioctl(sk, cmd, &karg);
4208 if (ret)
4209 return ret;
4210
4211 return put_user(karg, (int __user *)arg);
4212}
4213
4214/* A wrapper around sock ioctls, which copies the data from userspace
4215 * (depending on the protocol/ioctl), and copies back the result to userspace.
4216 * The main motivation for this function is to pass kernel memory to the
4217 * protocol ioctl callbacks, instead of userspace memory.
4218 */
4219int sk_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
4220{
4221 int rc = 1;
4222
4223 if (sk->sk_type == SOCK_RAW && sk->sk_family == AF_INET)
4224 rc = ipmr_sk_ioctl(sk, cmd, arg);
4225 else if (sk->sk_type == SOCK_RAW && sk->sk_family == AF_INET6)
4226 rc = ip6mr_sk_ioctl(sk, cmd, arg);
4227 else if (sk_is_phonet(sk))
4228 rc = phonet_sk_ioctl(sk, cmd, arg);
4229
4230 /* If ioctl was processed, returns its value */
4231 if (rc <= 0)
4232 return rc;
4233
4234 /* Otherwise call the default handler */
4235 return sock_ioctl_out(sk, cmd, arg);
4236}
4237EXPORT_SYMBOL(sk_ioctl);
4238
4239static int __init sock_struct_check(void)
4240{
4241 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_rx, sk_drops);
4242 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_rx, sk_peek_off);
4243 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_rx, sk_error_queue);
4244 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_rx, sk_receive_queue);
4245 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_rx, sk_backlog);
4246
4247 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rx, sk_rx_dst);
4248 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rx, sk_rx_dst_ifindex);
4249 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rx, sk_rx_dst_cookie);
4250 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rx, sk_rcvbuf);
4251 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rx, sk_filter);
4252 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rx, sk_wq);
4253 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rx, sk_data_ready);
4254 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rx, sk_rcvtimeo);
4255 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rx, sk_rcvlowat);
4256
4257 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rxtx, sk_err);
4258 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rxtx, sk_socket);
4259 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rxtx, sk_memcg);
4260
4261 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_rxtx, sk_lock);
4262 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_rxtx, sk_reserved_mem);
4263 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_rxtx, sk_forward_alloc);
4264 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_rxtx, sk_tsflags);
4265
4266 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_omem_alloc);
4267 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_omem_alloc);
4268 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_sndbuf);
4269 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_wmem_queued);
4270 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_wmem_alloc);
4271 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_tsq_flags);
4272 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_send_head);
4273 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_write_queue);
4274 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_write_pending);
4275 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_dst_pending_confirm);
4276 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_pacing_status);
4277 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_frag);
4278 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_timer);
4279 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_pacing_rate);
4280 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_zckey);
4281 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_tskey);
4282
4283 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_max_pacing_rate);
4284 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_sndtimeo);
4285 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_priority);
4286 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_mark);
4287 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_dst_cache);
4288 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_route_caps);
4289 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_gso_type);
4290 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_gso_max_size);
4291 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_allocation);
4292 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_txhash);
4293 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_gso_max_segs);
4294 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_pacing_shift);
4295 CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_use_task_frag);
4296 return 0;
4297}
4298
4299core_initcall(sock_struct_check);
4300

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source code of linux/net/core/sock.c