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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Generic socket support routines. Memory allocators, socket lock/release
8 * handler for protocols to use and generic option handler.
9 *
10 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
35 * code. The ACK stuff can wait and needs major
36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 */
85
86#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
87
88#include <asm/unaligned.h>
89#include <linux/capability.h>
90#include <linux/errno.h>
91#include <linux/errqueue.h>
92#include <linux/types.h>
93#include <linux/socket.h>
94#include <linux/in.h>
95#include <linux/kernel.h>
96#include <linux/module.h>
97#include <linux/proc_fs.h>
98#include <linux/seq_file.h>
99#include <linux/sched.h>
100#include <linux/sched/mm.h>
101#include <linux/timer.h>
102#include <linux/string.h>
103#include <linux/sockios.h>
104#include <linux/net.h>
105#include <linux/mm.h>
106#include <linux/slab.h>
107#include <linux/interrupt.h>
108#include <linux/poll.h>
109#include <linux/tcp.h>
110#include <linux/init.h>
111#include <linux/highmem.h>
112#include <linux/user_namespace.h>
113#include <linux/static_key.h>
114#include <linux/memcontrol.h>
115#include <linux/prefetch.h>
116#include <linux/compat.h>
117
118#include <linux/uaccess.h>
119
120#include <linux/netdevice.h>
121#include <net/protocol.h>
122#include <linux/skbuff.h>
123#include <net/net_namespace.h>
124#include <net/request_sock.h>
125#include <net/sock.h>
126#include <linux/net_tstamp.h>
127#include <net/xfrm.h>
128#include <linux/ipsec.h>
129#include <net/cls_cgroup.h>
130#include <net/netprio_cgroup.h>
131#include <linux/sock_diag.h>
132
133#include <linux/filter.h>
134#include <net/sock_reuseport.h>
135#include <net/bpf_sk_storage.h>
136
137#include <trace/events/sock.h>
138
139#include <net/tcp.h>
140#include <net/busy_poll.h>
141
142#include <linux/ethtool.h>
143
144static DEFINE_MUTEX(proto_list_mutex);
145static LIST_HEAD(proto_list);
146
147static void sock_inuse_add(struct net *net, int val);
148
149/**
150 * sk_ns_capable - General socket capability test
151 * @sk: Socket to use a capability on or through
152 * @user_ns: The user namespace of the capability to use
153 * @cap: The capability to use
154 *
155 * Test to see if the opener of the socket had when the socket was
156 * created and the current process has the capability @cap in the user
157 * namespace @user_ns.
158 */
159bool sk_ns_capable(const struct sock *sk,
160 struct user_namespace *user_ns, int cap)
161{
162 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
163 ns_capable(user_ns, cap);
164}
165EXPORT_SYMBOL(sk_ns_capable);
166
167/**
168 * sk_capable - Socket global capability test
169 * @sk: Socket to use a capability on or through
170 * @cap: The global capability to use
171 *
172 * Test to see if the opener of the socket had when the socket was
173 * created and the current process has the capability @cap in all user
174 * namespaces.
175 */
176bool sk_capable(const struct sock *sk, int cap)
177{
178 return sk_ns_capable(sk, &init_user_ns, cap);
179}
180EXPORT_SYMBOL(sk_capable);
181
182/**
183 * sk_net_capable - Network namespace socket capability test
184 * @sk: Socket to use a capability on or through
185 * @cap: The capability to use
186 *
187 * Test to see if the opener of the socket had when the socket was created
188 * and the current process has the capability @cap over the network namespace
189 * the socket is a member of.
190 */
191bool sk_net_capable(const struct sock *sk, int cap)
192{
193 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
194}
195EXPORT_SYMBOL(sk_net_capable);
196
197/*
198 * Each address family might have different locking rules, so we have
199 * one slock key per address family and separate keys for internal and
200 * userspace sockets.
201 */
202static struct lock_class_key af_family_keys[AF_MAX];
203static struct lock_class_key af_family_kern_keys[AF_MAX];
204static struct lock_class_key af_family_slock_keys[AF_MAX];
205static struct lock_class_key af_family_kern_slock_keys[AF_MAX];
206
207/*
208 * Make lock validator output more readable. (we pre-construct these
209 * strings build-time, so that runtime initialization of socket
210 * locks is fast):
211 */
212
213#define _sock_locks(x) \
214 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \
215 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \
216 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \
217 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \
218 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \
219 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \
220 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \
221 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \
222 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \
223 x "27" , x "28" , x "AF_CAN" , \
224 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \
225 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \
226 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \
227 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \
228 x "AF_QIPCRTR", x "AF_SMC" , x "AF_XDP" , \
229 x "AF_MAX"
230
231static const char *const af_family_key_strings[AF_MAX+1] = {
232 _sock_locks("sk_lock-")
233};
234static const char *const af_family_slock_key_strings[AF_MAX+1] = {
235 _sock_locks("slock-")
236};
237static const char *const af_family_clock_key_strings[AF_MAX+1] = {
238 _sock_locks("clock-")
239};
240
241static const char *const af_family_kern_key_strings[AF_MAX+1] = {
242 _sock_locks("k-sk_lock-")
243};
244static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = {
245 _sock_locks("k-slock-")
246};
247static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = {
248 _sock_locks("k-clock-")
249};
250static const char *const af_family_rlock_key_strings[AF_MAX+1] = {
251 _sock_locks("rlock-")
252};
253static const char *const af_family_wlock_key_strings[AF_MAX+1] = {
254 _sock_locks("wlock-")
255};
256static const char *const af_family_elock_key_strings[AF_MAX+1] = {
257 _sock_locks("elock-")
258};
259
260/*
261 * sk_callback_lock and sk queues locking rules are per-address-family,
262 * so split the lock classes by using a per-AF key:
263 */
264static struct lock_class_key af_callback_keys[AF_MAX];
265static struct lock_class_key af_rlock_keys[AF_MAX];
266static struct lock_class_key af_wlock_keys[AF_MAX];
267static struct lock_class_key af_elock_keys[AF_MAX];
268static struct lock_class_key af_kern_callback_keys[AF_MAX];
269
270/* Run time adjustable parameters. */
271__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
272EXPORT_SYMBOL(sysctl_wmem_max);
273__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
274EXPORT_SYMBOL(sysctl_rmem_max);
275__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
276__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
277
278/* Maximal space eaten by iovec or ancillary data plus some space */
279int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
280EXPORT_SYMBOL(sysctl_optmem_max);
281
282int sysctl_tstamp_allow_data __read_mostly = 1;
283
284DEFINE_STATIC_KEY_FALSE(memalloc_socks_key);
285EXPORT_SYMBOL_GPL(memalloc_socks_key);
286
287/**
288 * sk_set_memalloc - sets %SOCK_MEMALLOC
289 * @sk: socket to set it on
290 *
291 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
292 * It's the responsibility of the admin to adjust min_free_kbytes
293 * to meet the requirements
294 */
295void sk_set_memalloc(struct sock *sk)
296{
297 sock_set_flag(sk, SOCK_MEMALLOC);
298 sk->sk_allocation |= __GFP_MEMALLOC;
299 static_branch_inc(&memalloc_socks_key);
300}
301EXPORT_SYMBOL_GPL(sk_set_memalloc);
302
303void sk_clear_memalloc(struct sock *sk)
304{
305 sock_reset_flag(sk, SOCK_MEMALLOC);
306 sk->sk_allocation &= ~__GFP_MEMALLOC;
307 static_branch_dec(&memalloc_socks_key);
308
309 /*
310 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
311 * progress of swapping. SOCK_MEMALLOC may be cleared while
312 * it has rmem allocations due to the last swapfile being deactivated
313 * but there is a risk that the socket is unusable due to exceeding
314 * the rmem limits. Reclaim the reserves and obey rmem limits again.
315 */
316 sk_mem_reclaim(sk);
317}
318EXPORT_SYMBOL_GPL(sk_clear_memalloc);
319
320int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
321{
322 int ret;
323 unsigned int noreclaim_flag;
324
325 /* these should have been dropped before queueing */
326 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
327
328 noreclaim_flag = memalloc_noreclaim_save();
329 ret = sk->sk_backlog_rcv(sk, skb);
330 memalloc_noreclaim_restore(noreclaim_flag);
331
332 return ret;
333}
334EXPORT_SYMBOL(__sk_backlog_rcv);
335
336void sk_error_report(struct sock *sk)
337{
338 sk->sk_error_report(sk);
339
340 switch (sk->sk_family) {
341 case AF_INET:
342 fallthrough;
343 case AF_INET6:
344 trace_inet_sk_error_report(sk);
345 break;
346 default:
347 break;
348 }
349}
350EXPORT_SYMBOL(sk_error_report);
351
352static int sock_get_timeout(long timeo, void *optval, bool old_timeval)
353{
354 struct __kernel_sock_timeval tv;
355
356 if (timeo == MAX_SCHEDULE_TIMEOUT) {
357 tv.tv_sec = 0;
358 tv.tv_usec = 0;
359 } else {
360 tv.tv_sec = timeo / HZ;
361 tv.tv_usec = ((timeo % HZ) * USEC_PER_SEC) / HZ;
362 }
363
364 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
365 struct old_timeval32 tv32 = { tv.tv_sec, tv.tv_usec };
366 *(struct old_timeval32 *)optval = tv32;
367 return sizeof(tv32);
368 }
369
370 if (old_timeval) {
371 struct __kernel_old_timeval old_tv;
372 old_tv.tv_sec = tv.tv_sec;
373 old_tv.tv_usec = tv.tv_usec;
374 *(struct __kernel_old_timeval *)optval = old_tv;
375 return sizeof(old_tv);
376 }
377
378 *(struct __kernel_sock_timeval *)optval = tv;
379 return sizeof(tv);
380}
381
382static int sock_set_timeout(long *timeo_p, sockptr_t optval, int optlen,
383 bool old_timeval)
384{
385 struct __kernel_sock_timeval tv;
386
387 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
388 struct old_timeval32 tv32;
389
390 if (optlen < sizeof(tv32))
391 return -EINVAL;
392
393 if (copy_from_sockptr(&tv32, optval, sizeof(tv32)))
394 return -EFAULT;
395 tv.tv_sec = tv32.tv_sec;
396 tv.tv_usec = tv32.tv_usec;
397 } else if (old_timeval) {
398 struct __kernel_old_timeval old_tv;
399
400 if (optlen < sizeof(old_tv))
401 return -EINVAL;
402 if (copy_from_sockptr(&old_tv, optval, sizeof(old_tv)))
403 return -EFAULT;
404 tv.tv_sec = old_tv.tv_sec;
405 tv.tv_usec = old_tv.tv_usec;
406 } else {
407 if (optlen < sizeof(tv))
408 return -EINVAL;
409 if (copy_from_sockptr(&tv, optval, sizeof(tv)))
410 return -EFAULT;
411 }
412 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
413 return -EDOM;
414
415 if (tv.tv_sec < 0) {
416 static int warned __read_mostly;
417
418 *timeo_p = 0;
419 if (warned < 10 && net_ratelimit()) {
420 warned++;
421 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
422 __func__, current->comm, task_pid_nr(current));
423 }
424 return 0;
425 }
426 *timeo_p = MAX_SCHEDULE_TIMEOUT;
427 if (tv.tv_sec == 0 && tv.tv_usec == 0)
428 return 0;
429 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1))
430 *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP((unsigned long)tv.tv_usec, USEC_PER_SEC / HZ);
431 return 0;
432}
433
434static bool sock_needs_netstamp(const struct sock *sk)
435{
436 switch (sk->sk_family) {
437 case AF_UNSPEC:
438 case AF_UNIX:
439 return false;
440 default:
441 return true;
442 }
443}
444
445static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
446{
447 if (sk->sk_flags & flags) {
448 sk->sk_flags &= ~flags;
449 if (sock_needs_netstamp(sk) &&
450 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
451 net_disable_timestamp();
452 }
453}
454
455
456int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
457{
458 unsigned long flags;
459 struct sk_buff_head *list = &sk->sk_receive_queue;
460
461 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
462 atomic_inc(&sk->sk_drops);
463 trace_sock_rcvqueue_full(sk, skb);
464 return -ENOMEM;
465 }
466
467 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
468 atomic_inc(&sk->sk_drops);
469 return -ENOBUFS;
470 }
471
472 skb->dev = NULL;
473 skb_set_owner_r(skb, sk);
474
475 /* we escape from rcu protected region, make sure we dont leak
476 * a norefcounted dst
477 */
478 skb_dst_force(skb);
479
480 spin_lock_irqsave(&list->lock, flags);
481 sock_skb_set_dropcount(sk, skb);
482 __skb_queue_tail(list, skb);
483 spin_unlock_irqrestore(&list->lock, flags);
484
485 if (!sock_flag(sk, SOCK_DEAD))
486 sk->sk_data_ready(sk);
487 return 0;
488}
489EXPORT_SYMBOL(__sock_queue_rcv_skb);
490
491int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
492{
493 int err;
494
495 err = sk_filter(sk, skb);
496 if (err)
497 return err;
498
499 return __sock_queue_rcv_skb(sk, skb);
500}
501EXPORT_SYMBOL(sock_queue_rcv_skb);
502
503int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
504 const int nested, unsigned int trim_cap, bool refcounted)
505{
506 int rc = NET_RX_SUCCESS;
507
508 if (sk_filter_trim_cap(sk, skb, trim_cap))
509 goto discard_and_relse;
510
511 skb->dev = NULL;
512
513 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
514 atomic_inc(&sk->sk_drops);
515 goto discard_and_relse;
516 }
517 if (nested)
518 bh_lock_sock_nested(sk);
519 else
520 bh_lock_sock(sk);
521 if (!sock_owned_by_user(sk)) {
522 /*
523 * trylock + unlock semantics:
524 */
525 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
526
527 rc = sk_backlog_rcv(sk, skb);
528
529 mutex_release(&sk->sk_lock.dep_map, _RET_IP_);
530 } else if (sk_add_backlog(sk, skb, READ_ONCE(sk->sk_rcvbuf))) {
531 bh_unlock_sock(sk);
532 atomic_inc(&sk->sk_drops);
533 goto discard_and_relse;
534 }
535
536 bh_unlock_sock(sk);
537out:
538 if (refcounted)
539 sock_put(sk);
540 return rc;
541discard_and_relse:
542 kfree_skb(skb);
543 goto out;
544}
545EXPORT_SYMBOL(__sk_receive_skb);
546
547INDIRECT_CALLABLE_DECLARE(struct dst_entry *ip6_dst_check(struct dst_entry *,
548 u32));
549INDIRECT_CALLABLE_DECLARE(struct dst_entry *ipv4_dst_check(struct dst_entry *,
550 u32));
551struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
552{
553 struct dst_entry *dst = __sk_dst_get(sk);
554
555 if (dst && dst->obsolete &&
556 INDIRECT_CALL_INET(dst->ops->check, ip6_dst_check, ipv4_dst_check,
557 dst, cookie) == NULL) {
558 sk_tx_queue_clear(sk);
559 sk->sk_dst_pending_confirm = 0;
560 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
561 dst_release(dst);
562 return NULL;
563 }
564
565 return dst;
566}
567EXPORT_SYMBOL(__sk_dst_check);
568
569struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
570{
571 struct dst_entry *dst = sk_dst_get(sk);
572
573 if (dst && dst->obsolete &&
574 INDIRECT_CALL_INET(dst->ops->check, ip6_dst_check, ipv4_dst_check,
575 dst, cookie) == NULL) {
576 sk_dst_reset(sk);
577 dst_release(dst);
578 return NULL;
579 }
580
581 return dst;
582}
583EXPORT_SYMBOL(sk_dst_check);
584
585static int sock_bindtoindex_locked(struct sock *sk, int ifindex)
586{
587 int ret = -ENOPROTOOPT;
588#ifdef CONFIG_NETDEVICES
589 struct net *net = sock_net(sk);
590
591 /* Sorry... */
592 ret = -EPERM;
593 if (sk->sk_bound_dev_if && !ns_capable(net->user_ns, CAP_NET_RAW))
594 goto out;
595
596 ret = -EINVAL;
597 if (ifindex < 0)
598 goto out;
599
600 sk->sk_bound_dev_if = ifindex;
601 if (sk->sk_prot->rehash)
602 sk->sk_prot->rehash(sk);
603 sk_dst_reset(sk);
604
605 ret = 0;
606
607out:
608#endif
609
610 return ret;
611}
612
613int sock_bindtoindex(struct sock *sk, int ifindex, bool lock_sk)
614{
615 int ret;
616
617 if (lock_sk)
618 lock_sock(sk);
619 ret = sock_bindtoindex_locked(sk, ifindex);
620 if (lock_sk)
621 release_sock(sk);
622
623 return ret;
624}
625EXPORT_SYMBOL(sock_bindtoindex);
626
627static int sock_setbindtodevice(struct sock *sk, sockptr_t optval, int optlen)
628{
629 int ret = -ENOPROTOOPT;
630#ifdef CONFIG_NETDEVICES
631 struct net *net = sock_net(sk);
632 char devname[IFNAMSIZ];
633 int index;
634
635 ret = -EINVAL;
636 if (optlen < 0)
637 goto out;
638
639 /* Bind this socket to a particular device like "eth0",
640 * as specified in the passed interface name. If the
641 * name is "" or the option length is zero the socket
642 * is not bound.
643 */
644 if (optlen > IFNAMSIZ - 1)
645 optlen = IFNAMSIZ - 1;
646 memset(devname, 0, sizeof(devname));
647
648 ret = -EFAULT;
649 if (copy_from_sockptr(devname, optval, optlen))
650 goto out;
651
652 index = 0;
653 if (devname[0] != '\0') {
654 struct net_device *dev;
655
656 rcu_read_lock();
657 dev = dev_get_by_name_rcu(net, devname);
658 if (dev)
659 index = dev->ifindex;
660 rcu_read_unlock();
661 ret = -ENODEV;
662 if (!dev)
663 goto out;
664 }
665
666 return sock_bindtoindex(sk, index, true);
667out:
668#endif
669
670 return ret;
671}
672
673static int sock_getbindtodevice(struct sock *sk, char __user *optval,
674 int __user *optlen, int len)
675{
676 int ret = -ENOPROTOOPT;
677#ifdef CONFIG_NETDEVICES
678 struct net *net = sock_net(sk);
679 char devname[IFNAMSIZ];
680
681 if (sk->sk_bound_dev_if == 0) {
682 len = 0;
683 goto zero;
684 }
685
686 ret = -EINVAL;
687 if (len < IFNAMSIZ)
688 goto out;
689
690 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
691 if (ret)
692 goto out;
693
694 len = strlen(devname) + 1;
695
696 ret = -EFAULT;
697 if (copy_to_user(optval, devname, len))
698 goto out;
699
700zero:
701 ret = -EFAULT;
702 if (put_user(len, optlen))
703 goto out;
704
705 ret = 0;
706
707out:
708#endif
709
710 return ret;
711}
712
713bool sk_mc_loop(struct sock *sk)
714{
715 if (dev_recursion_level())
716 return false;
717 if (!sk)
718 return true;
719 switch (sk->sk_family) {
720 case AF_INET:
721 return inet_sk(sk)->mc_loop;
722#if IS_ENABLED(CONFIG_IPV6)
723 case AF_INET6:
724 return inet6_sk(sk)->mc_loop;
725#endif
726 }
727 WARN_ON_ONCE(1);
728 return true;
729}
730EXPORT_SYMBOL(sk_mc_loop);
731
732void sock_set_reuseaddr(struct sock *sk)
733{
734 lock_sock(sk);
735 sk->sk_reuse = SK_CAN_REUSE;
736 release_sock(sk);
737}
738EXPORT_SYMBOL(sock_set_reuseaddr);
739
740void sock_set_reuseport(struct sock *sk)
741{
742 lock_sock(sk);
743 sk->sk_reuseport = true;
744 release_sock(sk);
745}
746EXPORT_SYMBOL(sock_set_reuseport);
747
748void sock_no_linger(struct sock *sk)
749{
750 lock_sock(sk);
751 sk->sk_lingertime = 0;
752 sock_set_flag(sk, SOCK_LINGER);
753 release_sock(sk);
754}
755EXPORT_SYMBOL(sock_no_linger);
756
757void sock_set_priority(struct sock *sk, u32 priority)
758{
759 lock_sock(sk);
760 sk->sk_priority = priority;
761 release_sock(sk);
762}
763EXPORT_SYMBOL(sock_set_priority);
764
765void sock_set_sndtimeo(struct sock *sk, s64 secs)
766{
767 lock_sock(sk);
768 if (secs && secs < MAX_SCHEDULE_TIMEOUT / HZ - 1)
769 sk->sk_sndtimeo = secs * HZ;
770 else
771 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
772 release_sock(sk);
773}
774EXPORT_SYMBOL(sock_set_sndtimeo);
775
776static void __sock_set_timestamps(struct sock *sk, bool val, bool new, bool ns)
777{
778 if (val) {
779 sock_valbool_flag(sk, SOCK_TSTAMP_NEW, new);
780 sock_valbool_flag(sk, SOCK_RCVTSTAMPNS, ns);
781 sock_set_flag(sk, SOCK_RCVTSTAMP);
782 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
783 } else {
784 sock_reset_flag(sk, SOCK_RCVTSTAMP);
785 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
786 }
787}
788
789void sock_enable_timestamps(struct sock *sk)
790{
791 lock_sock(sk);
792 __sock_set_timestamps(sk, true, false, true);
793 release_sock(sk);
794}
795EXPORT_SYMBOL(sock_enable_timestamps);
796
797void sock_set_timestamp(struct sock *sk, int optname, bool valbool)
798{
799 switch (optname) {
800 case SO_TIMESTAMP_OLD:
801 __sock_set_timestamps(sk, valbool, false, false);
802 break;
803 case SO_TIMESTAMP_NEW:
804 __sock_set_timestamps(sk, valbool, true, false);
805 break;
806 case SO_TIMESTAMPNS_OLD:
807 __sock_set_timestamps(sk, valbool, false, true);
808 break;
809 case SO_TIMESTAMPNS_NEW:
810 __sock_set_timestamps(sk, valbool, true, true);
811 break;
812 }
813}
814
815static int sock_timestamping_bind_phc(struct sock *sk, int phc_index)
816{
817 struct net *net = sock_net(sk);
818 struct net_device *dev = NULL;
819 bool match = false;
820 int *vclock_index;
821 int i, num;
822
823 if (sk->sk_bound_dev_if)
824 dev = dev_get_by_index(net, sk->sk_bound_dev_if);
825
826 if (!dev) {
827 pr_err("%s: sock not bind to device\n", __func__);
828 return -EOPNOTSUPP;
829 }
830
831 num = ethtool_get_phc_vclocks(dev, &vclock_index);
832 for (i = 0; i < num; i++) {
833 if (*(vclock_index + i) == phc_index) {
834 match = true;
835 break;
836 }
837 }
838
839 if (num > 0)
840 kfree(vclock_index);
841
842 if (!match)
843 return -EINVAL;
844
845 sk->sk_bind_phc = phc_index;
846
847 return 0;
848}
849
850int sock_set_timestamping(struct sock *sk, int optname,
851 struct so_timestamping timestamping)
852{
853 int val = timestamping.flags;
854 int ret;
855
856 if (val & ~SOF_TIMESTAMPING_MASK)
857 return -EINVAL;
858
859 if (val & SOF_TIMESTAMPING_OPT_ID &&
860 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
861 if (sk->sk_protocol == IPPROTO_TCP &&
862 sk->sk_type == SOCK_STREAM) {
863 if ((1 << sk->sk_state) &
864 (TCPF_CLOSE | TCPF_LISTEN))
865 return -EINVAL;
866 sk->sk_tskey = tcp_sk(sk)->snd_una;
867 } else {
868 sk->sk_tskey = 0;
869 }
870 }
871
872 if (val & SOF_TIMESTAMPING_OPT_STATS &&
873 !(val & SOF_TIMESTAMPING_OPT_TSONLY))
874 return -EINVAL;
875
876 if (val & SOF_TIMESTAMPING_BIND_PHC) {
877 ret = sock_timestamping_bind_phc(sk, timestamping.bind_phc);
878 if (ret)
879 return ret;
880 }
881
882 sk->sk_tsflags = val;
883 sock_valbool_flag(sk, SOCK_TSTAMP_NEW, optname == SO_TIMESTAMPING_NEW);
884
885 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
886 sock_enable_timestamp(sk,
887 SOCK_TIMESTAMPING_RX_SOFTWARE);
888 else
889 sock_disable_timestamp(sk,
890 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
891 return 0;
892}
893
894void sock_set_keepalive(struct sock *sk)
895{
896 lock_sock(sk);
897 if (sk->sk_prot->keepalive)
898 sk->sk_prot->keepalive(sk, true);
899 sock_valbool_flag(sk, SOCK_KEEPOPEN, true);
900 release_sock(sk);
901}
902EXPORT_SYMBOL(sock_set_keepalive);
903
904static void __sock_set_rcvbuf(struct sock *sk, int val)
905{
906 /* Ensure val * 2 fits into an int, to prevent max_t() from treating it
907 * as a negative value.
908 */
909 val = min_t(int, val, INT_MAX / 2);
910 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
911
912 /* We double it on the way in to account for "struct sk_buff" etc.
913 * overhead. Applications assume that the SO_RCVBUF setting they make
914 * will allow that much actual data to be received on that socket.
915 *
916 * Applications are unaware that "struct sk_buff" and other overheads
917 * allocate from the receive buffer during socket buffer allocation.
918 *
919 * And after considering the possible alternatives, returning the value
920 * we actually used in getsockopt is the most desirable behavior.
921 */
922 WRITE_ONCE(sk->sk_rcvbuf, max_t(int, val * 2, SOCK_MIN_RCVBUF));
923}
924
925void sock_set_rcvbuf(struct sock *sk, int val)
926{
927 lock_sock(sk);
928 __sock_set_rcvbuf(sk, val);
929 release_sock(sk);
930}
931EXPORT_SYMBOL(sock_set_rcvbuf);
932
933static void __sock_set_mark(struct sock *sk, u32 val)
934{
935 if (val != sk->sk_mark) {
936 sk->sk_mark = val;
937 sk_dst_reset(sk);
938 }
939}
940
941void sock_set_mark(struct sock *sk, u32 val)
942{
943 lock_sock(sk);
944 __sock_set_mark(sk, val);
945 release_sock(sk);
946}
947EXPORT_SYMBOL(sock_set_mark);
948
949/*
950 * This is meant for all protocols to use and covers goings on
951 * at the socket level. Everything here is generic.
952 */
953
954int sock_setsockopt(struct socket *sock, int level, int optname,
955 sockptr_t optval, unsigned int optlen)
956{
957 struct so_timestamping timestamping;
958 struct sock_txtime sk_txtime;
959 struct sock *sk = sock->sk;
960 int val;
961 int valbool;
962 struct linger ling;
963 int ret = 0;
964
965 /*
966 * Options without arguments
967 */
968
969 if (optname == SO_BINDTODEVICE)
970 return sock_setbindtodevice(sk, optval, optlen);
971
972 if (optlen < sizeof(int))
973 return -EINVAL;
974
975 if (copy_from_sockptr(&val, optval, sizeof(val)))
976 return -EFAULT;
977
978 valbool = val ? 1 : 0;
979
980 lock_sock(sk);
981
982 switch (optname) {
983 case SO_DEBUG:
984 if (val && !capable(CAP_NET_ADMIN))
985 ret = -EACCES;
986 else
987 sock_valbool_flag(sk, SOCK_DBG, valbool);
988 break;
989 case SO_REUSEADDR:
990 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
991 break;
992 case SO_REUSEPORT:
993 sk->sk_reuseport = valbool;
994 break;
995 case SO_TYPE:
996 case SO_PROTOCOL:
997 case SO_DOMAIN:
998 case SO_ERROR:
999 ret = -ENOPROTOOPT;
1000 break;
1001 case SO_DONTROUTE:
1002 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
1003 sk_dst_reset(sk);
1004 break;
1005 case SO_BROADCAST:
1006 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
1007 break;
1008 case SO_SNDBUF:
1009 /* Don't error on this BSD doesn't and if you think
1010 * about it this is right. Otherwise apps have to
1011 * play 'guess the biggest size' games. RCVBUF/SNDBUF
1012 * are treated in BSD as hints
1013 */
1014 val = min_t(u32, val, sysctl_wmem_max);
1015set_sndbuf:
1016 /* Ensure val * 2 fits into an int, to prevent max_t()
1017 * from treating it as a negative value.
1018 */
1019 val = min_t(int, val, INT_MAX / 2);
1020 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1021 WRITE_ONCE(sk->sk_sndbuf,
1022 max_t(int, val * 2, SOCK_MIN_SNDBUF));
1023 /* Wake up sending tasks if we upped the value. */
1024 sk->sk_write_space(sk);
1025 break;
1026
1027 case SO_SNDBUFFORCE:
1028 if (!capable(CAP_NET_ADMIN)) {
1029 ret = -EPERM;
1030 break;
1031 }
1032
1033 /* No negative values (to prevent underflow, as val will be
1034 * multiplied by 2).
1035 */
1036 if (val < 0)
1037 val = 0;
1038 goto set_sndbuf;
1039
1040 case SO_RCVBUF:
1041 /* Don't error on this BSD doesn't and if you think
1042 * about it this is right. Otherwise apps have to
1043 * play 'guess the biggest size' games. RCVBUF/SNDBUF
1044 * are treated in BSD as hints
1045 */
1046 __sock_set_rcvbuf(sk, min_t(u32, val, sysctl_rmem_max));
1047 break;
1048
1049 case SO_RCVBUFFORCE:
1050 if (!capable(CAP_NET_ADMIN)) {
1051 ret = -EPERM;
1052 break;
1053 }
1054
1055 /* No negative values (to prevent underflow, as val will be
1056 * multiplied by 2).
1057 */
1058 __sock_set_rcvbuf(sk, max(val, 0));
1059 break;
1060
1061 case SO_KEEPALIVE:
1062 if (sk->sk_prot->keepalive)
1063 sk->sk_prot->keepalive(sk, valbool);
1064 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
1065 break;
1066
1067 case SO_OOBINLINE:
1068 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
1069 break;
1070
1071 case SO_NO_CHECK:
1072 sk->sk_no_check_tx = valbool;
1073 break;
1074
1075 case SO_PRIORITY:
1076 if ((val >= 0 && val <= 6) ||
1077 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1078 sk->sk_priority = val;
1079 else
1080 ret = -EPERM;
1081 break;
1082
1083 case SO_LINGER:
1084 if (optlen < sizeof(ling)) {
1085 ret = -EINVAL; /* 1003.1g */
1086 break;
1087 }
1088 if (copy_from_sockptr(&ling, optval, sizeof(ling))) {
1089 ret = -EFAULT;
1090 break;
1091 }
1092 if (!ling.l_onoff)
1093 sock_reset_flag(sk, SOCK_LINGER);
1094 else {
1095#if (BITS_PER_LONG == 32)
1096 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
1097 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1098 else
1099#endif
1100 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
1101 sock_set_flag(sk, SOCK_LINGER);
1102 }
1103 break;
1104
1105 case SO_BSDCOMPAT:
1106 break;
1107
1108 case SO_PASSCRED:
1109 if (valbool)
1110 set_bit(SOCK_PASSCRED, &sock->flags);
1111 else
1112 clear_bit(SOCK_PASSCRED, &sock->flags);
1113 break;
1114
1115 case SO_TIMESTAMP_OLD:
1116 case SO_TIMESTAMP_NEW:
1117 case SO_TIMESTAMPNS_OLD:
1118 case SO_TIMESTAMPNS_NEW:
1119 sock_set_timestamp(sk, optname, valbool);
1120 break;
1121
1122 case SO_TIMESTAMPING_NEW:
1123 case SO_TIMESTAMPING_OLD:
1124 if (optlen == sizeof(timestamping)) {
1125 if (copy_from_sockptr(×tamping, optval,
1126 sizeof(timestamping))) {
1127 ret = -EFAULT;
1128 break;
1129 }
1130 } else {
1131 memset(×tamping, 0, sizeof(timestamping));
1132 timestamping.flags = val;
1133 }
1134 ret = sock_set_timestamping(sk, optname, timestamping);
1135 break;
1136
1137 case SO_RCVLOWAT:
1138 if (val < 0)
1139 val = INT_MAX;
1140 if (sock->ops->set_rcvlowat)
1141 ret = sock->ops->set_rcvlowat(sk, val);
1142 else
1143 WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
1144 break;
1145
1146 case SO_RCVTIMEO_OLD:
1147 case SO_RCVTIMEO_NEW:
1148 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval,
1149 optlen, optname == SO_RCVTIMEO_OLD);
1150 break;
1151
1152 case SO_SNDTIMEO_OLD:
1153 case SO_SNDTIMEO_NEW:
1154 ret = sock_set_timeout(&sk->sk_sndtimeo, optval,
1155 optlen, optname == SO_SNDTIMEO_OLD);
1156 break;
1157
1158 case SO_ATTACH_FILTER: {
1159 struct sock_fprog fprog;
1160
1161 ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
1162 if (!ret)
1163 ret = sk_attach_filter(&fprog, sk);
1164 break;
1165 }
1166 case SO_ATTACH_BPF:
1167 ret = -EINVAL;
1168 if (optlen == sizeof(u32)) {
1169 u32 ufd;
1170
1171 ret = -EFAULT;
1172 if (copy_from_sockptr(&ufd, optval, sizeof(ufd)))
1173 break;
1174
1175 ret = sk_attach_bpf(ufd, sk);
1176 }
1177 break;
1178
1179 case SO_ATTACH_REUSEPORT_CBPF: {
1180 struct sock_fprog fprog;
1181
1182 ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
1183 if (!ret)
1184 ret = sk_reuseport_attach_filter(&fprog, sk);
1185 break;
1186 }
1187 case SO_ATTACH_REUSEPORT_EBPF:
1188 ret = -EINVAL;
1189 if (optlen == sizeof(u32)) {
1190 u32 ufd;
1191
1192 ret = -EFAULT;
1193 if (copy_from_sockptr(&ufd, optval, sizeof(ufd)))
1194 break;
1195
1196 ret = sk_reuseport_attach_bpf(ufd, sk);
1197 }
1198 break;
1199
1200 case SO_DETACH_REUSEPORT_BPF:
1201 ret = reuseport_detach_prog(sk);
1202 break;
1203
1204 case SO_DETACH_FILTER:
1205 ret = sk_detach_filter(sk);
1206 break;
1207
1208 case SO_LOCK_FILTER:
1209 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
1210 ret = -EPERM;
1211 else
1212 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
1213 break;
1214
1215 case SO_PASSSEC:
1216 if (valbool)
1217 set_bit(SOCK_PASSSEC, &sock->flags);
1218 else
1219 clear_bit(SOCK_PASSSEC, &sock->flags);
1220 break;
1221 case SO_MARK:
1222 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1223 ret = -EPERM;
1224 break;
1225 }
1226
1227 __sock_set_mark(sk, val);
1228 break;
1229
1230 case SO_RXQ_OVFL:
1231 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
1232 break;
1233
1234 case SO_WIFI_STATUS:
1235 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
1236 break;
1237
1238 case SO_PEEK_OFF:
1239 if (sock->ops->set_peek_off)
1240 ret = sock->ops->set_peek_off(sk, val);
1241 else
1242 ret = -EOPNOTSUPP;
1243 break;
1244
1245 case SO_NOFCS:
1246 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
1247 break;
1248
1249 case SO_SELECT_ERR_QUEUE:
1250 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
1251 break;
1252
1253#ifdef CONFIG_NET_RX_BUSY_POLL
1254 case SO_BUSY_POLL:
1255 /* allow unprivileged users to decrease the value */
1256 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
1257 ret = -EPERM;
1258 else {
1259 if (val < 0)
1260 ret = -EINVAL;
1261 else
1262 WRITE_ONCE(sk->sk_ll_usec, val);
1263 }
1264 break;
1265 case SO_PREFER_BUSY_POLL:
1266 if (valbool && !capable(CAP_NET_ADMIN))
1267 ret = -EPERM;
1268 else
1269 WRITE_ONCE(sk->sk_prefer_busy_poll, valbool);
1270 break;
1271 case SO_BUSY_POLL_BUDGET:
1272 if (val > READ_ONCE(sk->sk_busy_poll_budget) && !capable(CAP_NET_ADMIN)) {
1273 ret = -EPERM;
1274 } else {
1275 if (val < 0 || val > U16_MAX)
1276 ret = -EINVAL;
1277 else
1278 WRITE_ONCE(sk->sk_busy_poll_budget, val);
1279 }
1280 break;
1281#endif
1282
1283 case SO_MAX_PACING_RATE:
1284 {
1285 unsigned long ulval = (val == ~0U) ? ~0UL : (unsigned int)val;
1286
1287 if (sizeof(ulval) != sizeof(val) &&
1288 optlen >= sizeof(ulval) &&
1289 copy_from_sockptr(&ulval, optval, sizeof(ulval))) {
1290 ret = -EFAULT;
1291 break;
1292 }
1293 if (ulval != ~0UL)
1294 cmpxchg(&sk->sk_pacing_status,
1295 SK_PACING_NONE,
1296 SK_PACING_NEEDED);
1297 sk->sk_max_pacing_rate = ulval;
1298 sk->sk_pacing_rate = min(sk->sk_pacing_rate, ulval);
1299 break;
1300 }
1301 case SO_INCOMING_CPU:
1302 WRITE_ONCE(sk->sk_incoming_cpu, val);
1303 break;
1304
1305 case SO_CNX_ADVICE:
1306 if (val == 1)
1307 dst_negative_advice(sk);
1308 break;
1309
1310 case SO_ZEROCOPY:
1311 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) {
1312 if (!((sk->sk_type == SOCK_STREAM &&
1313 sk->sk_protocol == IPPROTO_TCP) ||
1314 (sk->sk_type == SOCK_DGRAM &&
1315 sk->sk_protocol == IPPROTO_UDP)))
1316 ret = -ENOTSUPP;
1317 } else if (sk->sk_family != PF_RDS) {
1318 ret = -ENOTSUPP;
1319 }
1320 if (!ret) {
1321 if (val < 0 || val > 1)
1322 ret = -EINVAL;
1323 else
1324 sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool);
1325 }
1326 break;
1327
1328 case SO_TXTIME:
1329 if (optlen != sizeof(struct sock_txtime)) {
1330 ret = -EINVAL;
1331 break;
1332 } else if (copy_from_sockptr(&sk_txtime, optval,
1333 sizeof(struct sock_txtime))) {
1334 ret = -EFAULT;
1335 break;
1336 } else if (sk_txtime.flags & ~SOF_TXTIME_FLAGS_MASK) {
1337 ret = -EINVAL;
1338 break;
1339 }
1340 /* CLOCK_MONOTONIC is only used by sch_fq, and this packet
1341 * scheduler has enough safe guards.
1342 */
1343 if (sk_txtime.clockid != CLOCK_MONOTONIC &&
1344 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1345 ret = -EPERM;
1346 break;
1347 }
1348 sock_valbool_flag(sk, SOCK_TXTIME, true);
1349 sk->sk_clockid = sk_txtime.clockid;
1350 sk->sk_txtime_deadline_mode =
1351 !!(sk_txtime.flags & SOF_TXTIME_DEADLINE_MODE);
1352 sk->sk_txtime_report_errors =
1353 !!(sk_txtime.flags & SOF_TXTIME_REPORT_ERRORS);
1354 break;
1355
1356 case SO_BINDTOIFINDEX:
1357 ret = sock_bindtoindex_locked(sk, val);
1358 break;
1359
1360 default:
1361 ret = -ENOPROTOOPT;
1362 break;
1363 }
1364 release_sock(sk);
1365 return ret;
1366}
1367EXPORT_SYMBOL(sock_setsockopt);
1368
1369static const struct cred *sk_get_peer_cred(struct sock *sk)
1370{
1371 const struct cred *cred;
1372
1373 spin_lock(&sk->sk_peer_lock);
1374 cred = get_cred(sk->sk_peer_cred);
1375 spin_unlock(&sk->sk_peer_lock);
1376
1377 return cred;
1378}
1379
1380static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1381 struct ucred *ucred)
1382{
1383 ucred->pid = pid_vnr(pid);
1384 ucred->uid = ucred->gid = -1;
1385 if (cred) {
1386 struct user_namespace *current_ns = current_user_ns();
1387
1388 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1389 ucred->gid = from_kgid_munged(current_ns, cred->egid);
1390 }
1391}
1392
1393static int groups_to_user(gid_t __user *dst, const struct group_info *src)
1394{
1395 struct user_namespace *user_ns = current_user_ns();
1396 int i;
1397
1398 for (i = 0; i < src->ngroups; i++)
1399 if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i))
1400 return -EFAULT;
1401
1402 return 0;
1403}
1404
1405int sock_getsockopt(struct socket *sock, int level, int optname,
1406 char __user *optval, int __user *optlen)
1407{
1408 struct sock *sk = sock->sk;
1409
1410 union {
1411 int val;
1412 u64 val64;
1413 unsigned long ulval;
1414 struct linger ling;
1415 struct old_timeval32 tm32;
1416 struct __kernel_old_timeval tm;
1417 struct __kernel_sock_timeval stm;
1418 struct sock_txtime txtime;
1419 struct so_timestamping timestamping;
1420 } v;
1421
1422 int lv = sizeof(int);
1423 int len;
1424
1425 if (get_user(len, optlen))
1426 return -EFAULT;
1427 if (len < 0)
1428 return -EINVAL;
1429
1430 memset(&v, 0, sizeof(v));
1431
1432 switch (optname) {
1433 case SO_DEBUG:
1434 v.val = sock_flag(sk, SOCK_DBG);
1435 break;
1436
1437 case SO_DONTROUTE:
1438 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1439 break;
1440
1441 case SO_BROADCAST:
1442 v.val = sock_flag(sk, SOCK_BROADCAST);
1443 break;
1444
1445 case SO_SNDBUF:
1446 v.val = sk->sk_sndbuf;
1447 break;
1448
1449 case SO_RCVBUF:
1450 v.val = sk->sk_rcvbuf;
1451 break;
1452
1453 case SO_REUSEADDR:
1454 v.val = sk->sk_reuse;
1455 break;
1456
1457 case SO_REUSEPORT:
1458 v.val = sk->sk_reuseport;
1459 break;
1460
1461 case SO_KEEPALIVE:
1462 v.val = sock_flag(sk, SOCK_KEEPOPEN);
1463 break;
1464
1465 case SO_TYPE:
1466 v.val = sk->sk_type;
1467 break;
1468
1469 case SO_PROTOCOL:
1470 v.val = sk->sk_protocol;
1471 break;
1472
1473 case SO_DOMAIN:
1474 v.val = sk->sk_family;
1475 break;
1476
1477 case SO_ERROR:
1478 v.val = -sock_error(sk);
1479 if (v.val == 0)
1480 v.val = xchg(&sk->sk_err_soft, 0);
1481 break;
1482
1483 case SO_OOBINLINE:
1484 v.val = sock_flag(sk, SOCK_URGINLINE);
1485 break;
1486
1487 case SO_NO_CHECK:
1488 v.val = sk->sk_no_check_tx;
1489 break;
1490
1491 case SO_PRIORITY:
1492 v.val = sk->sk_priority;
1493 break;
1494
1495 case SO_LINGER:
1496 lv = sizeof(v.ling);
1497 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
1498 v.ling.l_linger = sk->sk_lingertime / HZ;
1499 break;
1500
1501 case SO_BSDCOMPAT:
1502 break;
1503
1504 case SO_TIMESTAMP_OLD:
1505 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1506 !sock_flag(sk, SOCK_TSTAMP_NEW) &&
1507 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1508 break;
1509
1510 case SO_TIMESTAMPNS_OLD:
1511 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && !sock_flag(sk, SOCK_TSTAMP_NEW);
1512 break;
1513
1514 case SO_TIMESTAMP_NEW:
1515 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && sock_flag(sk, SOCK_TSTAMP_NEW);
1516 break;
1517
1518 case SO_TIMESTAMPNS_NEW:
1519 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && sock_flag(sk, SOCK_TSTAMP_NEW);
1520 break;
1521
1522 case SO_TIMESTAMPING_OLD:
1523 lv = sizeof(v.timestamping);
1524 v.timestamping.flags = sk->sk_tsflags;
1525 v.timestamping.bind_phc = sk->sk_bind_phc;
1526 break;
1527
1528 case SO_RCVTIMEO_OLD:
1529 case SO_RCVTIMEO_NEW:
1530 lv = sock_get_timeout(sk->sk_rcvtimeo, &v, SO_RCVTIMEO_OLD == optname);
1531 break;
1532
1533 case SO_SNDTIMEO_OLD:
1534 case SO_SNDTIMEO_NEW:
1535 lv = sock_get_timeout(sk->sk_sndtimeo, &v, SO_SNDTIMEO_OLD == optname);
1536 break;
1537
1538 case SO_RCVLOWAT:
1539 v.val = sk->sk_rcvlowat;
1540 break;
1541
1542 case SO_SNDLOWAT:
1543 v.val = 1;
1544 break;
1545
1546 case SO_PASSCRED:
1547 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1548 break;
1549
1550 case SO_PEERCRED:
1551 {
1552 struct ucred peercred;
1553 if (len > sizeof(peercred))
1554 len = sizeof(peercred);
1555
1556 spin_lock(&sk->sk_peer_lock);
1557 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1558 spin_unlock(&sk->sk_peer_lock);
1559
1560 if (copy_to_user(optval, &peercred, len))
1561 return -EFAULT;
1562 goto lenout;
1563 }
1564
1565 case SO_PEERGROUPS:
1566 {
1567 const struct cred *cred;
1568 int ret, n;
1569
1570 cred = sk_get_peer_cred(sk);
1571 if (!cred)
1572 return -ENODATA;
1573
1574 n = cred->group_info->ngroups;
1575 if (len < n * sizeof(gid_t)) {
1576 len = n * sizeof(gid_t);
1577 put_cred(cred);
1578 return put_user(len, optlen) ? -EFAULT : -ERANGE;
1579 }
1580 len = n * sizeof(gid_t);
1581
1582 ret = groups_to_user((gid_t __user *)optval, cred->group_info);
1583 put_cred(cred);
1584 if (ret)
1585 return ret;
1586 goto lenout;
1587 }
1588
1589 case SO_PEERNAME:
1590 {
1591 char address[128];
1592
1593 lv = sock->ops->getname(sock, (struct sockaddr *)address, 2);
1594 if (lv < 0)
1595 return -ENOTCONN;
1596 if (lv < len)
1597 return -EINVAL;
1598 if (copy_to_user(optval, address, len))
1599 return -EFAULT;
1600 goto lenout;
1601 }
1602
1603 /* Dubious BSD thing... Probably nobody even uses it, but
1604 * the UNIX standard wants it for whatever reason... -DaveM
1605 */
1606 case SO_ACCEPTCONN:
1607 v.val = sk->sk_state == TCP_LISTEN;
1608 break;
1609
1610 case SO_PASSSEC:
1611 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1612 break;
1613
1614 case SO_PEERSEC:
1615 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1616
1617 case SO_MARK:
1618 v.val = sk->sk_mark;
1619 break;
1620
1621 case SO_RXQ_OVFL:
1622 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1623 break;
1624
1625 case SO_WIFI_STATUS:
1626 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1627 break;
1628
1629 case SO_PEEK_OFF:
1630 if (!sock->ops->set_peek_off)
1631 return -EOPNOTSUPP;
1632
1633 v.val = sk->sk_peek_off;
1634 break;
1635 case SO_NOFCS:
1636 v.val = sock_flag(sk, SOCK_NOFCS);
1637 break;
1638
1639 case SO_BINDTODEVICE:
1640 return sock_getbindtodevice(sk, optval, optlen, len);
1641
1642 case SO_GET_FILTER:
1643 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1644 if (len < 0)
1645 return len;
1646
1647 goto lenout;
1648
1649 case SO_LOCK_FILTER:
1650 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1651 break;
1652
1653 case SO_BPF_EXTENSIONS:
1654 v.val = bpf_tell_extensions();
1655 break;
1656
1657 case SO_SELECT_ERR_QUEUE:
1658 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1659 break;
1660
1661#ifdef CONFIG_NET_RX_BUSY_POLL
1662 case SO_BUSY_POLL:
1663 v.val = sk->sk_ll_usec;
1664 break;
1665 case SO_PREFER_BUSY_POLL:
1666 v.val = READ_ONCE(sk->sk_prefer_busy_poll);
1667 break;
1668#endif
1669
1670 case SO_MAX_PACING_RATE:
1671 if (sizeof(v.ulval) != sizeof(v.val) && len >= sizeof(v.ulval)) {
1672 lv = sizeof(v.ulval);
1673 v.ulval = sk->sk_max_pacing_rate;
1674 } else {
1675 /* 32bit version */
1676 v.val = min_t(unsigned long, sk->sk_max_pacing_rate, ~0U);
1677 }
1678 break;
1679
1680 case SO_INCOMING_CPU:
1681 v.val = READ_ONCE(sk->sk_incoming_cpu);
1682 break;
1683
1684 case SO_MEMINFO:
1685 {
1686 u32 meminfo[SK_MEMINFO_VARS];
1687
1688 sk_get_meminfo(sk, meminfo);
1689
1690 len = min_t(unsigned int, len, sizeof(meminfo));
1691 if (copy_to_user(optval, &meminfo, len))
1692 return -EFAULT;
1693
1694 goto lenout;
1695 }
1696
1697#ifdef CONFIG_NET_RX_BUSY_POLL
1698 case SO_INCOMING_NAPI_ID:
1699 v.val = READ_ONCE(sk->sk_napi_id);
1700
1701 /* aggregate non-NAPI IDs down to 0 */
1702 if (v.val < MIN_NAPI_ID)
1703 v.val = 0;
1704
1705 break;
1706#endif
1707
1708 case SO_COOKIE:
1709 lv = sizeof(u64);
1710 if (len < lv)
1711 return -EINVAL;
1712 v.val64 = sock_gen_cookie(sk);
1713 break;
1714
1715 case SO_ZEROCOPY:
1716 v.val = sock_flag(sk, SOCK_ZEROCOPY);
1717 break;
1718
1719 case SO_TXTIME:
1720 lv = sizeof(v.txtime);
1721 v.txtime.clockid = sk->sk_clockid;
1722 v.txtime.flags |= sk->sk_txtime_deadline_mode ?
1723 SOF_TXTIME_DEADLINE_MODE : 0;
1724 v.txtime.flags |= sk->sk_txtime_report_errors ?
1725 SOF_TXTIME_REPORT_ERRORS : 0;
1726 break;
1727
1728 case SO_BINDTOIFINDEX:
1729 v.val = sk->sk_bound_dev_if;
1730 break;
1731
1732 case SO_NETNS_COOKIE:
1733 lv = sizeof(u64);
1734 if (len != lv)
1735 return -EINVAL;
1736 v.val64 = sock_net(sk)->net_cookie;
1737 break;
1738
1739 default:
1740 /* We implement the SO_SNDLOWAT etc to not be settable
1741 * (1003.1g 7).
1742 */
1743 return -ENOPROTOOPT;
1744 }
1745
1746 if (len > lv)
1747 len = lv;
1748 if (copy_to_user(optval, &v, len))
1749 return -EFAULT;
1750lenout:
1751 if (put_user(len, optlen))
1752 return -EFAULT;
1753 return 0;
1754}
1755
1756/*
1757 * Initialize an sk_lock.
1758 *
1759 * (We also register the sk_lock with the lock validator.)
1760 */
1761static inline void sock_lock_init(struct sock *sk)
1762{
1763 if (sk->sk_kern_sock)
1764 sock_lock_init_class_and_name(
1765 sk,
1766 af_family_kern_slock_key_strings[sk->sk_family],
1767 af_family_kern_slock_keys + sk->sk_family,
1768 af_family_kern_key_strings[sk->sk_family],
1769 af_family_kern_keys + sk->sk_family);
1770 else
1771 sock_lock_init_class_and_name(
1772 sk,
1773 af_family_slock_key_strings[sk->sk_family],
1774 af_family_slock_keys + sk->sk_family,
1775 af_family_key_strings[sk->sk_family],
1776 af_family_keys + sk->sk_family);
1777}
1778
1779/*
1780 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1781 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1782 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1783 */
1784static void sock_copy(struct sock *nsk, const struct sock *osk)
1785{
1786 const struct proto *prot = READ_ONCE(osk->sk_prot);
1787#ifdef CONFIG_SECURITY_NETWORK
1788 void *sptr = nsk->sk_security;
1789#endif
1790
1791 /* If we move sk_tx_queue_mapping out of the private section,
1792 * we must check if sk_tx_queue_clear() is called after
1793 * sock_copy() in sk_clone_lock().
1794 */
1795 BUILD_BUG_ON(offsetof(struct sock, sk_tx_queue_mapping) <
1796 offsetof(struct sock, sk_dontcopy_begin) ||
1797 offsetof(struct sock, sk_tx_queue_mapping) >=
1798 offsetof(struct sock, sk_dontcopy_end));
1799
1800 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1801
1802 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1803 prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1804
1805#ifdef CONFIG_SECURITY_NETWORK
1806 nsk->sk_security = sptr;
1807 security_sk_clone(osk, nsk);
1808#endif
1809}
1810
1811static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1812 int family)
1813{
1814 struct sock *sk;
1815 struct kmem_cache *slab;
1816
1817 slab = prot->slab;
1818 if (slab != NULL) {
1819 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1820 if (!sk)
1821 return sk;
1822 if (want_init_on_alloc(priority))
1823 sk_prot_clear_nulls(sk, prot->obj_size);
1824 } else
1825 sk = kmalloc(prot->obj_size, priority);
1826
1827 if (sk != NULL) {
1828 if (security_sk_alloc(sk, family, priority))
1829 goto out_free;
1830
1831 if (!try_module_get(prot->owner))
1832 goto out_free_sec;
1833 }
1834
1835 return sk;
1836
1837out_free_sec:
1838 security_sk_free(sk);
1839out_free:
1840 if (slab != NULL)
1841 kmem_cache_free(slab, sk);
1842 else
1843 kfree(sk);
1844 return NULL;
1845}
1846
1847static void sk_prot_free(struct proto *prot, struct sock *sk)
1848{
1849 struct kmem_cache *slab;
1850 struct module *owner;
1851
1852 owner = prot->owner;
1853 slab = prot->slab;
1854
1855 cgroup_sk_free(&sk->sk_cgrp_data);
1856 mem_cgroup_sk_free(sk);
1857 security_sk_free(sk);
1858 if (slab != NULL)
1859 kmem_cache_free(slab, sk);
1860 else
1861 kfree(sk);
1862 module_put(owner);
1863}
1864
1865/**
1866 * sk_alloc - All socket objects are allocated here
1867 * @net: the applicable net namespace
1868 * @family: protocol family
1869 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1870 * @prot: struct proto associated with this new sock instance
1871 * @kern: is this to be a kernel socket?
1872 */
1873struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1874 struct proto *prot, int kern)
1875{
1876 struct sock *sk;
1877
1878 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1879 if (sk) {
1880 sk->sk_family = family;
1881 /*
1882 * See comment in struct sock definition to understand
1883 * why we need sk_prot_creator -acme
1884 */
1885 sk->sk_prot = sk->sk_prot_creator = prot;
1886 sk->sk_kern_sock = kern;
1887 sock_lock_init(sk);
1888 sk->sk_net_refcnt = kern ? 0 : 1;
1889 if (likely(sk->sk_net_refcnt)) {
1890 get_net(net);
1891 sock_inuse_add(net, 1);
1892 }
1893
1894 sock_net_set(sk, net);
1895 refcount_set(&sk->sk_wmem_alloc, 1);
1896
1897 mem_cgroup_sk_alloc(sk);
1898 cgroup_sk_alloc(&sk->sk_cgrp_data);
1899 sock_update_classid(&sk->sk_cgrp_data);
1900 sock_update_netprioidx(&sk->sk_cgrp_data);
1901 sk_tx_queue_clear(sk);
1902 }
1903
1904 return sk;
1905}
1906EXPORT_SYMBOL(sk_alloc);
1907
1908/* Sockets having SOCK_RCU_FREE will call this function after one RCU
1909 * grace period. This is the case for UDP sockets and TCP listeners.
1910 */
1911static void __sk_destruct(struct rcu_head *head)
1912{
1913 struct sock *sk = container_of(head, struct sock, sk_rcu);
1914 struct sk_filter *filter;
1915
1916 if (sk->sk_destruct)
1917 sk->sk_destruct(sk);
1918
1919 filter = rcu_dereference_check(sk->sk_filter,
1920 refcount_read(&sk->sk_wmem_alloc) == 0);
1921 if (filter) {
1922 sk_filter_uncharge(sk, filter);
1923 RCU_INIT_POINTER(sk->sk_filter, NULL);
1924 }
1925
1926 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1927
1928#ifdef CONFIG_BPF_SYSCALL
1929 bpf_sk_storage_free(sk);
1930#endif
1931
1932 if (atomic_read(&sk->sk_omem_alloc))
1933 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1934 __func__, atomic_read(&sk->sk_omem_alloc));
1935
1936 if (sk->sk_frag.page) {
1937 put_page(sk->sk_frag.page);
1938 sk->sk_frag.page = NULL;
1939 }
1940
1941 /* We do not need to acquire sk->sk_peer_lock, we are the last user. */
1942 put_cred(sk->sk_peer_cred);
1943 put_pid(sk->sk_peer_pid);
1944
1945 if (likely(sk->sk_net_refcnt))
1946 put_net(sock_net(sk));
1947 sk_prot_free(sk->sk_prot_creator, sk);
1948}
1949
1950void sk_destruct(struct sock *sk)
1951{
1952 bool use_call_rcu = sock_flag(sk, SOCK_RCU_FREE);
1953
1954 if (rcu_access_pointer(sk->sk_reuseport_cb)) {
1955 reuseport_detach_sock(sk);
1956 use_call_rcu = true;
1957 }
1958
1959 if (use_call_rcu)
1960 call_rcu(&sk->sk_rcu, __sk_destruct);
1961 else
1962 __sk_destruct(&sk->sk_rcu);
1963}
1964
1965static void __sk_free(struct sock *sk)
1966{
1967 if (likely(sk->sk_net_refcnt))
1968 sock_inuse_add(sock_net(sk), -1);
1969
1970 if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk)))
1971 sock_diag_broadcast_destroy(sk);
1972 else
1973 sk_destruct(sk);
1974}
1975
1976void sk_free(struct sock *sk)
1977{
1978 /*
1979 * We subtract one from sk_wmem_alloc and can know if
1980 * some packets are still in some tx queue.
1981 * If not null, sock_wfree() will call __sk_free(sk) later
1982 */
1983 if (refcount_dec_and_test(&sk->sk_wmem_alloc))
1984 __sk_free(sk);
1985}
1986EXPORT_SYMBOL(sk_free);
1987
1988static void sk_init_common(struct sock *sk)
1989{
1990 skb_queue_head_init(&sk->sk_receive_queue);
1991 skb_queue_head_init(&sk->sk_write_queue);
1992 skb_queue_head_init(&sk->sk_error_queue);
1993
1994 rwlock_init(&sk->sk_callback_lock);
1995 lockdep_set_class_and_name(&sk->sk_receive_queue.lock,
1996 af_rlock_keys + sk->sk_family,
1997 af_family_rlock_key_strings[sk->sk_family]);
1998 lockdep_set_class_and_name(&sk->sk_write_queue.lock,
1999 af_wlock_keys + sk->sk_family,
2000 af_family_wlock_key_strings[sk->sk_family]);
2001 lockdep_set_class_and_name(&sk->sk_error_queue.lock,
2002 af_elock_keys + sk->sk_family,
2003 af_family_elock_key_strings[sk->sk_family]);
2004 lockdep_set_class_and_name(&sk->sk_callback_lock,
2005 af_callback_keys + sk->sk_family,
2006 af_family_clock_key_strings[sk->sk_family]);
2007}
2008
2009/**
2010 * sk_clone_lock - clone a socket, and lock its clone
2011 * @sk: the socket to clone
2012 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
2013 *
2014 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
2015 */
2016struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
2017{
2018 struct proto *prot = READ_ONCE(sk->sk_prot);
2019 struct sk_filter *filter;
2020 bool is_charged = true;
2021 struct sock *newsk;
2022
2023 newsk = sk_prot_alloc(prot, priority, sk->sk_family);
2024 if (!newsk)
2025 goto out;
2026
2027 sock_copy(newsk, sk);
2028
2029 newsk->sk_prot_creator = prot;
2030
2031 /* SANITY */
2032 if (likely(newsk->sk_net_refcnt))
2033 get_net(sock_net(newsk));
2034 sk_node_init(&newsk->sk_node);
2035 sock_lock_init(newsk);
2036 bh_lock_sock(newsk);
2037 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
2038 newsk->sk_backlog.len = 0;
2039
2040 atomic_set(&newsk->sk_rmem_alloc, 0);
2041
2042 /* sk_wmem_alloc set to one (see sk_free() and sock_wfree()) */
2043 refcount_set(&newsk->sk_wmem_alloc, 1);
2044
2045 atomic_set(&newsk->sk_omem_alloc, 0);
2046 sk_init_common(newsk);
2047
2048 newsk->sk_dst_cache = NULL;
2049 newsk->sk_dst_pending_confirm = 0;
2050 newsk->sk_wmem_queued = 0;
2051 newsk->sk_forward_alloc = 0;
2052 atomic_set(&newsk->sk_drops, 0);
2053 newsk->sk_send_head = NULL;
2054 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
2055 atomic_set(&newsk->sk_zckey, 0);
2056
2057 sock_reset_flag(newsk, SOCK_DONE);
2058
2059 /* sk->sk_memcg will be populated at accept() time */
2060 newsk->sk_memcg = NULL;
2061
2062 cgroup_sk_clone(&newsk->sk_cgrp_data);
2063
2064 rcu_read_lock();
2065 filter = rcu_dereference(sk->sk_filter);
2066 if (filter != NULL)
2067 /* though it's an empty new sock, the charging may fail
2068 * if sysctl_optmem_max was changed between creation of
2069 * original socket and cloning
2070 */
2071 is_charged = sk_filter_charge(newsk, filter);
2072 RCU_INIT_POINTER(newsk->sk_filter, filter);
2073 rcu_read_unlock();
2074
2075 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
2076 /* We need to make sure that we don't uncharge the new
2077 * socket if we couldn't charge it in the first place
2078 * as otherwise we uncharge the parent's filter.
2079 */
2080 if (!is_charged)
2081 RCU_INIT_POINTER(newsk->sk_filter, NULL);
2082 sk_free_unlock_clone(newsk);
2083 newsk = NULL;
2084 goto out;
2085 }
2086 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
2087
2088 if (bpf_sk_storage_clone(sk, newsk)) {
2089 sk_free_unlock_clone(newsk);
2090 newsk = NULL;
2091 goto out;
2092 }
2093
2094 /* Clear sk_user_data if parent had the pointer tagged
2095 * as not suitable for copying when cloning.
2096 */
2097 if (sk_user_data_is_nocopy(newsk))
2098 newsk->sk_user_data = NULL;
2099
2100 newsk->sk_err = 0;
2101 newsk->sk_err_soft = 0;
2102 newsk->sk_priority = 0;
2103 newsk->sk_incoming_cpu = raw_smp_processor_id();
2104 if (likely(newsk->sk_net_refcnt))
2105 sock_inuse_add(sock_net(newsk), 1);
2106
2107 /* Before updating sk_refcnt, we must commit prior changes to memory
2108 * (Documentation/RCU/rculist_nulls.rst for details)
2109 */
2110 smp_wmb();
2111 refcount_set(&newsk->sk_refcnt, 2);
2112
2113 /* Increment the counter in the same struct proto as the master
2114 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
2115 * is the same as sk->sk_prot->socks, as this field was copied
2116 * with memcpy).
2117 *
2118 * This _changes_ the previous behaviour, where
2119 * tcp_create_openreq_child always was incrementing the
2120 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
2121 * to be taken into account in all callers. -acme
2122 */
2123 sk_refcnt_debug_inc(newsk);
2124 sk_set_socket(newsk, NULL);
2125 sk_tx_queue_clear(newsk);
2126 RCU_INIT_POINTER(newsk->sk_wq, NULL);
2127
2128 if (newsk->sk_prot->sockets_allocated)
2129 sk_sockets_allocated_inc(newsk);
2130
2131 if (sock_needs_netstamp(sk) && newsk->sk_flags & SK_FLAGS_TIMESTAMP)
2132 net_enable_timestamp();
2133out:
2134 return newsk;
2135}
2136EXPORT_SYMBOL_GPL(sk_clone_lock);
2137
2138void sk_free_unlock_clone(struct sock *sk)
2139{
2140 /* It is still raw copy of parent, so invalidate
2141 * destructor and make plain sk_free() */
2142 sk->sk_destruct = NULL;
2143 bh_unlock_sock(sk);
2144 sk_free(sk);
2145}
2146EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
2147
2148void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
2149{
2150 u32 max_segs = 1;
2151
2152 sk_dst_set(sk, dst);
2153 sk->sk_route_caps = dst->dev->features | sk->sk_route_forced_caps;
2154 if (sk->sk_route_caps & NETIF_F_GSO)
2155 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
2156 sk->sk_route_caps &= ~sk->sk_route_nocaps;
2157 if (sk_can_gso(sk)) {
2158 if (dst->header_len && !xfrm_dst_offload_ok(dst)) {
2159 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
2160 } else {
2161 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
2162 sk->sk_gso_max_size = dst->dev->gso_max_size;
2163 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
2164 }
2165 }
2166 sk->sk_gso_max_segs = max_segs;
2167}
2168EXPORT_SYMBOL_GPL(sk_setup_caps);
2169
2170/*
2171 * Simple resource managers for sockets.
2172 */
2173
2174
2175/*
2176 * Write buffer destructor automatically called from kfree_skb.
2177 */
2178void sock_wfree(struct sk_buff *skb)
2179{
2180 struct sock *sk = skb->sk;
2181 unsigned int len = skb->truesize;
2182
2183 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
2184 /*
2185 * Keep a reference on sk_wmem_alloc, this will be released
2186 * after sk_write_space() call
2187 */
2188 WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc));
2189 sk->sk_write_space(sk);
2190 len = 1;
2191 }
2192 /*
2193 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
2194 * could not do because of in-flight packets
2195 */
2196 if (refcount_sub_and_test(len, &sk->sk_wmem_alloc))
2197 __sk_free(sk);
2198}
2199EXPORT_SYMBOL(sock_wfree);
2200
2201/* This variant of sock_wfree() is used by TCP,
2202 * since it sets SOCK_USE_WRITE_QUEUE.
2203 */
2204void __sock_wfree(struct sk_buff *skb)
2205{
2206 struct sock *sk = skb->sk;
2207
2208 if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
2209 __sk_free(sk);
2210}
2211
2212void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
2213{
2214 skb_orphan(skb);
2215 skb->sk = sk;
2216#ifdef CONFIG_INET
2217 if (unlikely(!sk_fullsock(sk))) {
2218 skb->destructor = sock_edemux;
2219 sock_hold(sk);
2220 return;
2221 }
2222#endif
2223 skb->destructor = sock_wfree;
2224 skb_set_hash_from_sk(skb, sk);
2225 /*
2226 * We used to take a refcount on sk, but following operation
2227 * is enough to guarantee sk_free() wont free this sock until
2228 * all in-flight packets are completed
2229 */
2230 refcount_add(skb->truesize, &sk->sk_wmem_alloc);
2231}
2232EXPORT_SYMBOL(skb_set_owner_w);
2233
2234static bool can_skb_orphan_partial(const struct sk_buff *skb)
2235{
2236#ifdef CONFIG_TLS_DEVICE
2237 /* Drivers depend on in-order delivery for crypto offload,
2238 * partial orphan breaks out-of-order-OK logic.
2239 */
2240 if (skb->decrypted)
2241 return false;
2242#endif
2243 return (skb->destructor == sock_wfree ||
2244 (IS_ENABLED(CONFIG_INET) && skb->destructor == tcp_wfree));
2245}
2246
2247/* This helper is used by netem, as it can hold packets in its
2248 * delay queue. We want to allow the owner socket to send more
2249 * packets, as if they were already TX completed by a typical driver.
2250 * But we also want to keep skb->sk set because some packet schedulers
2251 * rely on it (sch_fq for example).
2252 */
2253void skb_orphan_partial(struct sk_buff *skb)
2254{
2255 if (skb_is_tcp_pure_ack(skb))
2256 return;
2257
2258 if (can_skb_orphan_partial(skb) && skb_set_owner_sk_safe(skb, skb->sk))
2259 return;
2260
2261 skb_orphan(skb);
2262}
2263EXPORT_SYMBOL(skb_orphan_partial);
2264
2265/*
2266 * Read buffer destructor automatically called from kfree_skb.
2267 */
2268void sock_rfree(struct sk_buff *skb)
2269{
2270 struct sock *sk = skb->sk;
2271 unsigned int len = skb->truesize;
2272
2273 atomic_sub(len, &sk->sk_rmem_alloc);
2274 sk_mem_uncharge(sk, len);
2275}
2276EXPORT_SYMBOL(sock_rfree);
2277
2278/*
2279 * Buffer destructor for skbs that are not used directly in read or write
2280 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
2281 */
2282void sock_efree(struct sk_buff *skb)
2283{
2284 sock_put(skb->sk);
2285}
2286EXPORT_SYMBOL(sock_efree);
2287
2288/* Buffer destructor for prefetch/receive path where reference count may
2289 * not be held, e.g. for listen sockets.
2290 */
2291#ifdef CONFIG_INET
2292void sock_pfree(struct sk_buff *skb)
2293{
2294 if (sk_is_refcounted(skb->sk))
2295 sock_gen_put(skb->sk);
2296}
2297EXPORT_SYMBOL(sock_pfree);
2298#endif /* CONFIG_INET */
2299
2300kuid_t sock_i_uid(struct sock *sk)
2301{
2302 kuid_t uid;
2303
2304 read_lock_bh(&sk->sk_callback_lock);
2305 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
2306 read_unlock_bh(&sk->sk_callback_lock);
2307 return uid;
2308}
2309EXPORT_SYMBOL(sock_i_uid);
2310
2311unsigned long sock_i_ino(struct sock *sk)
2312{
2313 unsigned long ino;
2314
2315 read_lock_bh(&sk->sk_callback_lock);
2316 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
2317 read_unlock_bh(&sk->sk_callback_lock);
2318 return ino;
2319}
2320EXPORT_SYMBOL(sock_i_ino);
2321
2322/*
2323 * Allocate a skb from the socket's send buffer.
2324 */
2325struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
2326 gfp_t priority)
2327{
2328 if (force ||
2329 refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf)) {
2330 struct sk_buff *skb = alloc_skb(size, priority);
2331
2332 if (skb) {
2333 skb_set_owner_w(skb, sk);
2334 return skb;
2335 }
2336 }
2337 return NULL;
2338}
2339EXPORT_SYMBOL(sock_wmalloc);
2340
2341static void sock_ofree(struct sk_buff *skb)
2342{
2343 struct sock *sk = skb->sk;
2344
2345 atomic_sub(skb->truesize, &sk->sk_omem_alloc);
2346}
2347
2348struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size,
2349 gfp_t priority)
2350{
2351 struct sk_buff *skb;
2352
2353 /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */
2354 if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) >
2355 sysctl_optmem_max)
2356 return NULL;
2357
2358 skb = alloc_skb(size, priority);
2359 if (!skb)
2360 return NULL;
2361
2362 atomic_add(skb->truesize, &sk->sk_omem_alloc);
2363 skb->sk = sk;
2364 skb->destructor = sock_ofree;
2365 return skb;
2366}
2367
2368/*
2369 * Allocate a memory block from the socket's option memory buffer.
2370 */
2371void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
2372{
2373 if ((unsigned int)size <= sysctl_optmem_max &&
2374 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
2375 void *mem;
2376 /* First do the add, to avoid the race if kmalloc
2377 * might sleep.
2378 */
2379 atomic_add(size, &sk->sk_omem_alloc);
2380 mem = kmalloc(size, priority);
2381 if (mem)
2382 return mem;
2383 atomic_sub(size, &sk->sk_omem_alloc);
2384 }
2385 return NULL;
2386}
2387EXPORT_SYMBOL(sock_kmalloc);
2388
2389/* Free an option memory block. Note, we actually want the inline
2390 * here as this allows gcc to detect the nullify and fold away the
2391 * condition entirely.
2392 */
2393static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
2394 const bool nullify)
2395{
2396 if (WARN_ON_ONCE(!mem))
2397 return;
2398 if (nullify)
2399 kfree_sensitive(mem);
2400 else
2401 kfree(mem);
2402 atomic_sub(size, &sk->sk_omem_alloc);
2403}
2404
2405void sock_kfree_s(struct sock *sk, void *mem, int size)
2406{
2407 __sock_kfree_s(sk, mem, size, false);
2408}
2409EXPORT_SYMBOL(sock_kfree_s);
2410
2411void sock_kzfree_s(struct sock *sk, void *mem, int size)
2412{
2413 __sock_kfree_s(sk, mem, size, true);
2414}
2415EXPORT_SYMBOL(sock_kzfree_s);
2416
2417/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
2418 I think, these locks should be removed for datagram sockets.
2419 */
2420static long sock_wait_for_wmem(struct sock *sk, long timeo)
2421{
2422 DEFINE_WAIT(wait);
2423
2424 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2425 for (;;) {
2426 if (!timeo)
2427 break;
2428 if (signal_pending(current))
2429 break;
2430 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2431 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2432 if (refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf))
2433 break;
2434 if (sk->sk_shutdown & SEND_SHUTDOWN)
2435 break;
2436 if (sk->sk_err)
2437 break;
2438 timeo = schedule_timeout(timeo);
2439 }
2440 finish_wait(sk_sleep(sk), &wait);
2441 return timeo;
2442}
2443
2444
2445/*
2446 * Generic send/receive buffer handlers
2447 */
2448
2449struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
2450 unsigned long data_len, int noblock,
2451 int *errcode, int max_page_order)
2452{
2453 struct sk_buff *skb;
2454 long timeo;
2455 int err;
2456
2457 timeo = sock_sndtimeo(sk, noblock);
2458 for (;;) {
2459 err = sock_error(sk);
2460 if (err != 0)
2461 goto failure;
2462
2463 err = -EPIPE;
2464 if (sk->sk_shutdown & SEND_SHUTDOWN)
2465 goto failure;
2466
2467 if (sk_wmem_alloc_get(sk) < READ_ONCE(sk->sk_sndbuf))
2468 break;
2469
2470 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2471 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2472 err = -EAGAIN;
2473 if (!timeo)
2474 goto failure;
2475 if (signal_pending(current))
2476 goto interrupted;
2477 timeo = sock_wait_for_wmem(sk, timeo);
2478 }
2479 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
2480 errcode, sk->sk_allocation);
2481 if (skb)
2482 skb_set_owner_w(skb, sk);
2483 return skb;
2484
2485interrupted:
2486 err = sock_intr_errno(timeo);
2487failure:
2488 *errcode = err;
2489 return NULL;
2490}
2491EXPORT_SYMBOL(sock_alloc_send_pskb);
2492
2493struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
2494 int noblock, int *errcode)
2495{
2496 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
2497}
2498EXPORT_SYMBOL(sock_alloc_send_skb);
2499
2500int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
2501 struct sockcm_cookie *sockc)
2502{
2503 u32 tsflags;
2504
2505 switch (cmsg->cmsg_type) {
2506 case SO_MARK:
2507 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2508 return -EPERM;
2509 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2510 return -EINVAL;
2511 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
2512 break;
2513 case SO_TIMESTAMPING_OLD:
2514 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2515 return -EINVAL;
2516
2517 tsflags = *(u32 *)CMSG_DATA(cmsg);
2518 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
2519 return -EINVAL;
2520
2521 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
2522 sockc->tsflags |= tsflags;
2523 break;
2524 case SCM_TXTIME:
2525 if (!sock_flag(sk, SOCK_TXTIME))
2526 return -EINVAL;
2527 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u64)))
2528 return -EINVAL;
2529 sockc->transmit_time = get_unaligned((u64 *)CMSG_DATA(cmsg));
2530 break;
2531 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
2532 case SCM_RIGHTS:
2533 case SCM_CREDENTIALS:
2534 break;
2535 default:
2536 return -EINVAL;
2537 }
2538 return 0;
2539}
2540EXPORT_SYMBOL(__sock_cmsg_send);
2541
2542int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
2543 struct sockcm_cookie *sockc)
2544{
2545 struct cmsghdr *cmsg;
2546 int ret;
2547
2548 for_each_cmsghdr(cmsg, msg) {
2549 if (!CMSG_OK(msg, cmsg))
2550 return -EINVAL;
2551 if (cmsg->cmsg_level != SOL_SOCKET)
2552 continue;
2553 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
2554 if (ret)
2555 return ret;
2556 }
2557 return 0;
2558}
2559EXPORT_SYMBOL(sock_cmsg_send);
2560
2561static void sk_enter_memory_pressure(struct sock *sk)
2562{
2563 if (!sk->sk_prot->enter_memory_pressure)
2564 return;
2565
2566 sk->sk_prot->enter_memory_pressure(sk);
2567}
2568
2569static void sk_leave_memory_pressure(struct sock *sk)
2570{
2571 if (sk->sk_prot->leave_memory_pressure) {
2572 sk->sk_prot->leave_memory_pressure(sk);
2573 } else {
2574 unsigned long *memory_pressure = sk->sk_prot->memory_pressure;
2575
2576 if (memory_pressure && READ_ONCE(*memory_pressure))
2577 WRITE_ONCE(*memory_pressure, 0);
2578 }
2579}
2580
2581#define SKB_FRAG_PAGE_ORDER get_order(32768)
2582DEFINE_STATIC_KEY_FALSE(net_high_order_alloc_disable_key);
2583
2584/**
2585 * skb_page_frag_refill - check that a page_frag contains enough room
2586 * @sz: minimum size of the fragment we want to get
2587 * @pfrag: pointer to page_frag
2588 * @gfp: priority for memory allocation
2589 *
2590 * Note: While this allocator tries to use high order pages, there is
2591 * no guarantee that allocations succeed. Therefore, @sz MUST be
2592 * less or equal than PAGE_SIZE.
2593 */
2594bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
2595{
2596 if (pfrag->page) {
2597 if (page_ref_count(pfrag->page) == 1) {
2598 pfrag->offset = 0;
2599 return true;
2600 }
2601 if (pfrag->offset + sz <= pfrag->size)
2602 return true;
2603 put_page(pfrag->page);
2604 }
2605
2606 pfrag->offset = 0;
2607 if (SKB_FRAG_PAGE_ORDER &&
2608 !static_branch_unlikely(&net_high_order_alloc_disable_key)) {
2609 /* Avoid direct reclaim but allow kswapd to wake */
2610 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
2611 __GFP_COMP | __GFP_NOWARN |
2612 __GFP_NORETRY,
2613 SKB_FRAG_PAGE_ORDER);
2614 if (likely(pfrag->page)) {
2615 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
2616 return true;
2617 }
2618 }
2619 pfrag->page = alloc_page(gfp);
2620 if (likely(pfrag->page)) {
2621 pfrag->size = PAGE_SIZE;
2622 return true;
2623 }
2624 return false;
2625}
2626EXPORT_SYMBOL(skb_page_frag_refill);
2627
2628bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2629{
2630 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2631 return true;
2632
2633 sk_enter_memory_pressure(sk);
2634 sk_stream_moderate_sndbuf(sk);
2635 return false;
2636}
2637EXPORT_SYMBOL(sk_page_frag_refill);
2638
2639void __lock_sock(struct sock *sk)
2640 __releases(&sk->sk_lock.slock)
2641 __acquires(&sk->sk_lock.slock)
2642{
2643 DEFINE_WAIT(wait);
2644
2645 for (;;) {
2646 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2647 TASK_UNINTERRUPTIBLE);
2648 spin_unlock_bh(&sk->sk_lock.slock);
2649 schedule();
2650 spin_lock_bh(&sk->sk_lock.slock);
2651 if (!sock_owned_by_user(sk))
2652 break;
2653 }
2654 finish_wait(&sk->sk_lock.wq, &wait);
2655}
2656
2657void __release_sock(struct sock *sk)
2658 __releases(&sk->sk_lock.slock)
2659 __acquires(&sk->sk_lock.slock)
2660{
2661 struct sk_buff *skb, *next;
2662
2663 while ((skb = sk->sk_backlog.head) != NULL) {
2664 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
2665
2666 spin_unlock_bh(&sk->sk_lock.slock);
2667
2668 do {
2669 next = skb->next;
2670 prefetch(next);
2671 WARN_ON_ONCE(skb_dst_is_noref(skb));
2672 skb_mark_not_on_list(skb);
2673 sk_backlog_rcv(sk, skb);
2674
2675 cond_resched();
2676
2677 skb = next;
2678 } while (skb != NULL);
2679
2680 spin_lock_bh(&sk->sk_lock.slock);
2681 }
2682
2683 /*
2684 * Doing the zeroing here guarantee we can not loop forever
2685 * while a wild producer attempts to flood us.
2686 */
2687 sk->sk_backlog.len = 0;
2688}
2689
2690void __sk_flush_backlog(struct sock *sk)
2691{
2692 spin_lock_bh(&sk->sk_lock.slock);
2693 __release_sock(sk);
2694 spin_unlock_bh(&sk->sk_lock.slock);
2695}
2696
2697/**
2698 * sk_wait_data - wait for data to arrive at sk_receive_queue
2699 * @sk: sock to wait on
2700 * @timeo: for how long
2701 * @skb: last skb seen on sk_receive_queue
2702 *
2703 * Now socket state including sk->sk_err is changed only under lock,
2704 * hence we may omit checks after joining wait queue.
2705 * We check receive queue before schedule() only as optimization;
2706 * it is very likely that release_sock() added new data.
2707 */
2708int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
2709{
2710 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2711 int rc;
2712
2713 add_wait_queue(sk_sleep(sk), &wait);
2714 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2715 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
2716 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2717 remove_wait_queue(sk_sleep(sk), &wait);
2718 return rc;
2719}
2720EXPORT_SYMBOL(sk_wait_data);
2721
2722/**
2723 * __sk_mem_raise_allocated - increase memory_allocated
2724 * @sk: socket
2725 * @size: memory size to allocate
2726 * @amt: pages to allocate
2727 * @kind: allocation type
2728 *
2729 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc
2730 */
2731int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
2732{
2733 struct proto *prot = sk->sk_prot;
2734 long allocated = sk_memory_allocated_add(sk, amt);
2735 bool charged = true;
2736
2737 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2738 !(charged = mem_cgroup_charge_skmem(sk->sk_memcg, amt)))
2739 goto suppress_allocation;
2740
2741 /* Under limit. */
2742 if (allocated <= sk_prot_mem_limits(sk, 0)) {
2743 sk_leave_memory_pressure(sk);
2744 return 1;
2745 }
2746
2747 /* Under pressure. */
2748 if (allocated > sk_prot_mem_limits(sk, 1))
2749 sk_enter_memory_pressure(sk);
2750
2751 /* Over hard limit. */
2752 if (allocated > sk_prot_mem_limits(sk, 2))
2753 goto suppress_allocation;
2754
2755 /* guarantee minimum buffer size under pressure */
2756 if (kind == SK_MEM_RECV) {
2757 if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot))
2758 return 1;
2759
2760 } else { /* SK_MEM_SEND */
2761 int wmem0 = sk_get_wmem0(sk, prot);
2762
2763 if (sk->sk_type == SOCK_STREAM) {
2764 if (sk->sk_wmem_queued < wmem0)
2765 return 1;
2766 } else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) {
2767 return 1;
2768 }
2769 }
2770
2771 if (sk_has_memory_pressure(sk)) {
2772 u64 alloc;
2773
2774 if (!sk_under_memory_pressure(sk))
2775 return 1;
2776 alloc = sk_sockets_allocated_read_positive(sk);
2777 if (sk_prot_mem_limits(sk, 2) > alloc *
2778 sk_mem_pages(sk->sk_wmem_queued +
2779 atomic_read(&sk->sk_rmem_alloc) +
2780 sk->sk_forward_alloc))
2781 return 1;
2782 }
2783
2784suppress_allocation:
2785
2786 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2787 sk_stream_moderate_sndbuf(sk);
2788
2789 /* Fail only if socket is _under_ its sndbuf.
2790 * In this case we cannot block, so that we have to fail.
2791 */
2792 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2793 return 1;
2794 }
2795
2796 if (kind == SK_MEM_SEND || (kind == SK_MEM_RECV && charged))
2797 trace_sock_exceed_buf_limit(sk, prot, allocated, kind);
2798
2799 sk_memory_allocated_sub(sk, amt);
2800
2801 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2802 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
2803
2804 return 0;
2805}
2806EXPORT_SYMBOL(__sk_mem_raise_allocated);
2807
2808/**
2809 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2810 * @sk: socket
2811 * @size: memory size to allocate
2812 * @kind: allocation type
2813 *
2814 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2815 * rmem allocation. This function assumes that protocols which have
2816 * memory_pressure use sk_wmem_queued as write buffer accounting.
2817 */
2818int __sk_mem_schedule(struct sock *sk, int size, int kind)
2819{
2820 int ret, amt = sk_mem_pages(size);
2821
2822 sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT;
2823 ret = __sk_mem_raise_allocated(sk, size, amt, kind);
2824 if (!ret)
2825 sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT;
2826 return ret;
2827}
2828EXPORT_SYMBOL(__sk_mem_schedule);
2829
2830/**
2831 * __sk_mem_reduce_allocated - reclaim memory_allocated
2832 * @sk: socket
2833 * @amount: number of quanta
2834 *
2835 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
2836 */
2837void __sk_mem_reduce_allocated(struct sock *sk, int amount)
2838{
2839 sk_memory_allocated_sub(sk, amount);
2840
2841 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2842 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
2843
2844 if (sk_under_memory_pressure(sk) &&
2845 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2846 sk_leave_memory_pressure(sk);
2847}
2848EXPORT_SYMBOL(__sk_mem_reduce_allocated);
2849
2850/**
2851 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
2852 * @sk: socket
2853 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
2854 */
2855void __sk_mem_reclaim(struct sock *sk, int amount)
2856{
2857 amount >>= SK_MEM_QUANTUM_SHIFT;
2858 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
2859 __sk_mem_reduce_allocated(sk, amount);
2860}
2861EXPORT_SYMBOL(__sk_mem_reclaim);
2862
2863int sk_set_peek_off(struct sock *sk, int val)
2864{
2865 sk->sk_peek_off = val;
2866 return 0;
2867}
2868EXPORT_SYMBOL_GPL(sk_set_peek_off);
2869
2870/*
2871 * Set of default routines for initialising struct proto_ops when
2872 * the protocol does not support a particular function. In certain
2873 * cases where it makes no sense for a protocol to have a "do nothing"
2874 * function, some default processing is provided.
2875 */
2876
2877int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2878{
2879 return -EOPNOTSUPP;
2880}
2881EXPORT_SYMBOL(sock_no_bind);
2882
2883int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
2884 int len, int flags)
2885{
2886 return -EOPNOTSUPP;
2887}
2888EXPORT_SYMBOL(sock_no_connect);
2889
2890int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2891{
2892 return -EOPNOTSUPP;
2893}
2894EXPORT_SYMBOL(sock_no_socketpair);
2895
2896int sock_no_accept(struct socket *sock, struct socket *newsock, int flags,
2897 bool kern)
2898{
2899 return -EOPNOTSUPP;
2900}
2901EXPORT_SYMBOL(sock_no_accept);
2902
2903int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
2904 int peer)
2905{
2906 return -EOPNOTSUPP;
2907}
2908EXPORT_SYMBOL(sock_no_getname);
2909
2910int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2911{
2912 return -EOPNOTSUPP;
2913}
2914EXPORT_SYMBOL(sock_no_ioctl);
2915
2916int sock_no_listen(struct socket *sock, int backlog)
2917{
2918 return -EOPNOTSUPP;
2919}
2920EXPORT_SYMBOL(sock_no_listen);
2921
2922int sock_no_shutdown(struct socket *sock, int how)
2923{
2924 return -EOPNOTSUPP;
2925}
2926EXPORT_SYMBOL(sock_no_shutdown);
2927
2928int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
2929{
2930 return -EOPNOTSUPP;
2931}
2932EXPORT_SYMBOL(sock_no_sendmsg);
2933
2934int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len)
2935{
2936 return -EOPNOTSUPP;
2937}
2938EXPORT_SYMBOL(sock_no_sendmsg_locked);
2939
2940int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2941 int flags)
2942{
2943 return -EOPNOTSUPP;
2944}
2945EXPORT_SYMBOL(sock_no_recvmsg);
2946
2947int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2948{
2949 /* Mirror missing mmap method error code */
2950 return -ENODEV;
2951}
2952EXPORT_SYMBOL(sock_no_mmap);
2953
2954/*
2955 * When a file is received (via SCM_RIGHTS, etc), we must bump the
2956 * various sock-based usage counts.
2957 */
2958void __receive_sock(struct file *file)
2959{
2960 struct socket *sock;
2961
2962 sock = sock_from_file(file);
2963 if (sock) {
2964 sock_update_netprioidx(&sock->sk->sk_cgrp_data);
2965 sock_update_classid(&sock->sk->sk_cgrp_data);
2966 }
2967}
2968
2969ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2970{
2971 ssize_t res;
2972 struct msghdr msg = {.msg_flags = flags};
2973 struct kvec iov;
2974 char *kaddr = kmap(page);
2975 iov.iov_base = kaddr + offset;
2976 iov.iov_len = size;
2977 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2978 kunmap(page);
2979 return res;
2980}
2981EXPORT_SYMBOL(sock_no_sendpage);
2982
2983ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page,
2984 int offset, size_t size, int flags)
2985{
2986 ssize_t res;
2987 struct msghdr msg = {.msg_flags = flags};
2988 struct kvec iov;
2989 char *kaddr = kmap(page);
2990
2991 iov.iov_base = kaddr + offset;
2992 iov.iov_len = size;
2993 res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size);
2994 kunmap(page);
2995 return res;
2996}
2997EXPORT_SYMBOL(sock_no_sendpage_locked);
2998
2999/*
3000 * Default Socket Callbacks
3001 */
3002
3003static void sock_def_wakeup(struct sock *sk)
3004{
3005 struct socket_wq *wq;
3006
3007 rcu_read_lock();
3008 wq = rcu_dereference(sk->sk_wq);
3009 if (skwq_has_sleeper(wq))
3010 wake_up_interruptible_all(&wq->wait);
3011 rcu_read_unlock();
3012}
3013
3014static void sock_def_error_report(struct sock *sk)
3015{
3016 struct socket_wq *wq;
3017
3018 rcu_read_lock();
3019 wq = rcu_dereference(sk->sk_wq);
3020 if (skwq_has_sleeper(wq))
3021 wake_up_interruptible_poll(&wq->wait, EPOLLERR);
3022 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
3023 rcu_read_unlock();
3024}
3025
3026void sock_def_readable(struct sock *sk)
3027{
3028 struct socket_wq *wq;
3029
3030 rcu_read_lock();
3031 wq = rcu_dereference(sk->sk_wq);
3032 if (skwq_has_sleeper(wq))
3033 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
3034 EPOLLRDNORM | EPOLLRDBAND);
3035 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
3036 rcu_read_unlock();
3037}
3038
3039static void sock_def_write_space(struct sock *sk)
3040{
3041 struct socket_wq *wq;
3042
3043 rcu_read_lock();
3044
3045 /* Do not wake up a writer until he can make "significant"
3046 * progress. --DaveM
3047 */
3048 if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= READ_ONCE(sk->sk_sndbuf)) {
3049 wq = rcu_dereference(sk->sk_wq);
3050 if (skwq_has_sleeper(wq))
3051 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
3052 EPOLLWRNORM | EPOLLWRBAND);
3053
3054 /* Should agree with poll, otherwise some programs break */
3055 if (sock_writeable(sk))
3056 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
3057 }
3058
3059 rcu_read_unlock();
3060}
3061
3062static void sock_def_destruct(struct sock *sk)
3063{
3064}
3065
3066void sk_send_sigurg(struct sock *sk)
3067{
3068 if (sk->sk_socket && sk->sk_socket->file)
3069 if (send_sigurg(&sk->sk_socket->file->f_owner))
3070 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
3071}
3072EXPORT_SYMBOL(sk_send_sigurg);
3073
3074void sk_reset_timer(struct sock *sk, struct timer_list* timer,
3075 unsigned long expires)
3076{
3077 if (!mod_timer(timer, expires))
3078 sock_hold(sk);
3079}
3080EXPORT_SYMBOL(sk_reset_timer);
3081
3082void sk_stop_timer(struct sock *sk, struct timer_list* timer)
3083{
3084 if (del_timer(timer))
3085 __sock_put(sk);
3086}
3087EXPORT_SYMBOL(sk_stop_timer);
3088
3089void sk_stop_timer_sync(struct sock *sk, struct timer_list *timer)
3090{
3091 if (del_timer_sync(timer))
3092 __sock_put(sk);
3093}
3094EXPORT_SYMBOL(sk_stop_timer_sync);
3095
3096void sock_init_data(struct socket *sock, struct sock *sk)
3097{
3098 sk_init_common(sk);
3099 sk->sk_send_head = NULL;
3100
3101 timer_setup(&sk->sk_timer, NULL, 0);
3102
3103 sk->sk_allocation = GFP_KERNEL;
3104 sk->sk_rcvbuf = sysctl_rmem_default;
3105 sk->sk_sndbuf = sysctl_wmem_default;
3106 sk->sk_state = TCP_CLOSE;
3107 sk_set_socket(sk, sock);
3108
3109 sock_set_flag(sk, SOCK_ZAPPED);
3110
3111 if (sock) {
3112 sk->sk_type = sock->type;
3113 RCU_INIT_POINTER(sk->sk_wq, &sock->wq);
3114 sock->sk = sk;
3115 sk->sk_uid = SOCK_INODE(sock)->i_uid;
3116 } else {
3117 RCU_INIT_POINTER(sk->sk_wq, NULL);
3118 sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0);
3119 }
3120
3121 rwlock_init(&sk->sk_callback_lock);
3122 if (sk->sk_kern_sock)
3123 lockdep_set_class_and_name(
3124 &sk->sk_callback_lock,
3125 af_kern_callback_keys + sk->sk_family,
3126 af_family_kern_clock_key_strings[sk->sk_family]);
3127 else
3128 lockdep_set_class_and_name(
3129 &sk->sk_callback_lock,
3130 af_callback_keys + sk->sk_family,
3131 af_family_clock_key_strings[sk->sk_family]);
3132
3133 sk->sk_state_change = sock_def_wakeup;
3134 sk->sk_data_ready = sock_def_readable;
3135 sk->sk_write_space = sock_def_write_space;
3136 sk->sk_error_report = sock_def_error_report;
3137 sk->sk_destruct = sock_def_destruct;
3138
3139 sk->sk_frag.page = NULL;
3140 sk->sk_frag.offset = 0;
3141 sk->sk_peek_off = -1;
3142
3143 sk->sk_peer_pid = NULL;
3144 sk->sk_peer_cred = NULL;
3145 spin_lock_init(&sk->sk_peer_lock);
3146
3147 sk->sk_write_pending = 0;
3148 sk->sk_rcvlowat = 1;
3149 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
3150 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
3151
3152 sk->sk_stamp = SK_DEFAULT_STAMP;
3153#if BITS_PER_LONG==32
3154 seqlock_init(&sk->sk_stamp_seq);
3155#endif
3156 atomic_set(&sk->sk_zckey, 0);
3157
3158#ifdef CONFIG_NET_RX_BUSY_POLL
3159 sk->sk_napi_id = 0;
3160 sk->sk_ll_usec = sysctl_net_busy_read;
3161#endif
3162
3163 sk->sk_max_pacing_rate = ~0UL;
3164 sk->sk_pacing_rate = ~0UL;
3165 WRITE_ONCE(sk->sk_pacing_shift, 10);
3166 sk->sk_incoming_cpu = -1;
3167
3168 sk_rx_queue_clear(sk);
3169 /*
3170 * Before updating sk_refcnt, we must commit prior changes to memory
3171 * (Documentation/RCU/rculist_nulls.rst for details)
3172 */
3173 smp_wmb();
3174 refcount_set(&sk->sk_refcnt, 1);
3175 atomic_set(&sk->sk_drops, 0);
3176}
3177EXPORT_SYMBOL(sock_init_data);
3178
3179void lock_sock_nested(struct sock *sk, int subclass)
3180{
3181 might_sleep();
3182 spin_lock_bh(&sk->sk_lock.slock);
3183 if (sk->sk_lock.owned)
3184 __lock_sock(sk);
3185 sk->sk_lock.owned = 1;
3186 spin_unlock(&sk->sk_lock.slock);
3187 /*
3188 * The sk_lock has mutex_lock() semantics here:
3189 */
3190 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
3191 local_bh_enable();
3192}
3193EXPORT_SYMBOL(lock_sock_nested);
3194
3195void release_sock(struct sock *sk)
3196{
3197 spin_lock_bh(&sk->sk_lock.slock);
3198 if (sk->sk_backlog.tail)
3199 __release_sock(sk);
3200
3201 /* Warning : release_cb() might need to release sk ownership,
3202 * ie call sock_release_ownership(sk) before us.
3203 */
3204 if (sk->sk_prot->release_cb)
3205 sk->sk_prot->release_cb(sk);
3206
3207 sock_release_ownership(sk);
3208 if (waitqueue_active(&sk->sk_lock.wq))
3209 wake_up(&sk->sk_lock.wq);
3210 spin_unlock_bh(&sk->sk_lock.slock);
3211}
3212EXPORT_SYMBOL(release_sock);
3213
3214/**
3215 * lock_sock_fast - fast version of lock_sock
3216 * @sk: socket
3217 *
3218 * This version should be used for very small section, where process wont block
3219 * return false if fast path is taken:
3220 *
3221 * sk_lock.slock locked, owned = 0, BH disabled
3222 *
3223 * return true if slow path is taken:
3224 *
3225 * sk_lock.slock unlocked, owned = 1, BH enabled
3226 */
3227bool lock_sock_fast(struct sock *sk) __acquires(&sk->sk_lock.slock)
3228{
3229 might_sleep();
3230 spin_lock_bh(&sk->sk_lock.slock);
3231
3232 if (!sk->sk_lock.owned)
3233 /*
3234 * Note : We must disable BH
3235 */
3236 return false;
3237
3238 __lock_sock(sk);
3239 sk->sk_lock.owned = 1;
3240 spin_unlock(&sk->sk_lock.slock);
3241 /*
3242 * The sk_lock has mutex_lock() semantics here:
3243 */
3244 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
3245 __acquire(&sk->sk_lock.slock);
3246 local_bh_enable();
3247 return true;
3248}
3249EXPORT_SYMBOL(lock_sock_fast);
3250
3251int sock_gettstamp(struct socket *sock, void __user *userstamp,
3252 bool timeval, bool time32)
3253{
3254 struct sock *sk = sock->sk;
3255 struct timespec64 ts;
3256
3257 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
3258 ts = ktime_to_timespec64(sock_read_timestamp(sk));
3259 if (ts.tv_sec == -1)
3260 return -ENOENT;
3261 if (ts.tv_sec == 0) {
3262 ktime_t kt = ktime_get_real();
3263 sock_write_timestamp(sk, kt);
3264 ts = ktime_to_timespec64(kt);
3265 }
3266
3267 if (timeval)
3268 ts.tv_nsec /= 1000;
3269
3270#ifdef CONFIG_COMPAT_32BIT_TIME
3271 if (time32)
3272 return put_old_timespec32(&ts, userstamp);
3273#endif
3274#ifdef CONFIG_SPARC64
3275 /* beware of padding in sparc64 timeval */
3276 if (timeval && !in_compat_syscall()) {
3277 struct __kernel_old_timeval __user tv = {
3278 .tv_sec = ts.tv_sec,
3279 .tv_usec = ts.tv_nsec,
3280 };
3281 if (copy_to_user(userstamp, &tv, sizeof(tv)))
3282 return -EFAULT;
3283 return 0;
3284 }
3285#endif
3286 return put_timespec64(&ts, userstamp);
3287}
3288EXPORT_SYMBOL(sock_gettstamp);
3289
3290void sock_enable_timestamp(struct sock *sk, enum sock_flags flag)
3291{
3292 if (!sock_flag(sk, flag)) {
3293 unsigned long previous_flags = sk->sk_flags;
3294
3295 sock_set_flag(sk, flag);
3296 /*
3297 * we just set one of the two flags which require net
3298 * time stamping, but time stamping might have been on
3299 * already because of the other one
3300 */
3301 if (sock_needs_netstamp(sk) &&
3302 !(previous_flags & SK_FLAGS_TIMESTAMP))
3303 net_enable_timestamp();
3304 }
3305}
3306
3307int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
3308 int level, int type)
3309{
3310 struct sock_exterr_skb *serr;
3311 struct sk_buff *skb;
3312 int copied, err;
3313
3314 err = -EAGAIN;
3315 skb = sock_dequeue_err_skb(sk);
3316 if (skb == NULL)
3317 goto out;
3318
3319 copied = skb->len;
3320 if (copied > len) {
3321 msg->msg_flags |= MSG_TRUNC;
3322 copied = len;
3323 }
3324 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3325 if (err)
3326 goto out_free_skb;
3327
3328 sock_recv_timestamp(msg, sk, skb);
3329
3330 serr = SKB_EXT_ERR(skb);
3331 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
3332
3333 msg->msg_flags |= MSG_ERRQUEUE;
3334 err = copied;
3335
3336out_free_skb:
3337 kfree_skb(skb);
3338out:
3339 return err;
3340}
3341EXPORT_SYMBOL(sock_recv_errqueue);
3342
3343/*
3344 * Get a socket option on an socket.
3345 *
3346 * FIX: POSIX 1003.1g is very ambiguous here. It states that
3347 * asynchronous errors should be reported by getsockopt. We assume
3348 * this means if you specify SO_ERROR (otherwise whats the point of it).
3349 */
3350int sock_common_getsockopt(struct socket *sock, int level, int optname,
3351 char __user *optval, int __user *optlen)
3352{
3353 struct sock *sk = sock->sk;
3354
3355 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
3356}
3357EXPORT_SYMBOL(sock_common_getsockopt);
3358
3359int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
3360 int flags)
3361{
3362 struct sock *sk = sock->sk;
3363 int addr_len = 0;
3364 int err;
3365
3366 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
3367 flags & ~MSG_DONTWAIT, &addr_len);
3368 if (err >= 0)
3369 msg->msg_namelen = addr_len;
3370 return err;
3371}
3372EXPORT_SYMBOL(sock_common_recvmsg);
3373
3374/*
3375 * Set socket options on an inet socket.
3376 */
3377int sock_common_setsockopt(struct socket *sock, int level, int optname,
3378 sockptr_t optval, unsigned int optlen)
3379{
3380 struct sock *sk = sock->sk;
3381
3382 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
3383}
3384EXPORT_SYMBOL(sock_common_setsockopt);
3385
3386void sk_common_release(struct sock *sk)
3387{
3388 if (sk->sk_prot->destroy)
3389 sk->sk_prot->destroy(sk);
3390
3391 /*
3392 * Observation: when sk_common_release is called, processes have
3393 * no access to socket. But net still has.
3394 * Step one, detach it from networking:
3395 *
3396 * A. Remove from hash tables.
3397 */
3398
3399 sk->sk_prot->unhash(sk);
3400
3401 /*
3402 * In this point socket cannot receive new packets, but it is possible
3403 * that some packets are in flight because some CPU runs receiver and
3404 * did hash table lookup before we unhashed socket. They will achieve
3405 * receive queue and will be purged by socket destructor.
3406 *
3407 * Also we still have packets pending on receive queue and probably,
3408 * our own packets waiting in device queues. sock_destroy will drain
3409 * receive queue, but transmitted packets will delay socket destruction
3410 * until the last reference will be released.
3411 */
3412
3413 sock_orphan(sk);
3414
3415 xfrm_sk_free_policy(sk);
3416
3417 sk_refcnt_debug_release(sk);
3418
3419 sock_put(sk);
3420}
3421EXPORT_SYMBOL(sk_common_release);
3422
3423void sk_get_meminfo(const struct sock *sk, u32 *mem)
3424{
3425 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
3426
3427 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
3428 mem[SK_MEMINFO_RCVBUF] = READ_ONCE(sk->sk_rcvbuf);
3429 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
3430 mem[SK_MEMINFO_SNDBUF] = READ_ONCE(sk->sk_sndbuf);
3431 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
3432 mem[SK_MEMINFO_WMEM_QUEUED] = READ_ONCE(sk->sk_wmem_queued);
3433 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
3434 mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len);
3435 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
3436}
3437
3438#ifdef CONFIG_PROC_FS
3439#define PROTO_INUSE_NR 64 /* should be enough for the first time */
3440struct prot_inuse {
3441 int val[PROTO_INUSE_NR];
3442};
3443
3444static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
3445
3446void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
3447{
3448 __this_cpu_add(net->core.prot_inuse->val[prot->inuse_idx], val);
3449}
3450EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
3451
3452int sock_prot_inuse_get(struct net *net, struct proto *prot)
3453{
3454 int cpu, idx = prot->inuse_idx;
3455 int res = 0;
3456
3457 for_each_possible_cpu(cpu)
3458 res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx];
3459
3460 return res >= 0 ? res : 0;
3461}
3462EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
3463
3464static void sock_inuse_add(struct net *net, int val)
3465{
3466 this_cpu_add(*net->core.sock_inuse, val);
3467}
3468
3469int sock_inuse_get(struct net *net)
3470{
3471 int cpu, res = 0;
3472
3473 for_each_possible_cpu(cpu)
3474 res += *per_cpu_ptr(net->core.sock_inuse, cpu);
3475
3476 return res;
3477}
3478
3479EXPORT_SYMBOL_GPL(sock_inuse_get);
3480
3481static int __net_init sock_inuse_init_net(struct net *net)
3482{
3483 net->core.prot_inuse = alloc_percpu(struct prot_inuse);
3484 if (net->core.prot_inuse == NULL)
3485 return -ENOMEM;
3486
3487 net->core.sock_inuse = alloc_percpu(int);
3488 if (net->core.sock_inuse == NULL)
3489 goto out;
3490
3491 return 0;
3492
3493out:
3494 free_percpu(net->core.prot_inuse);
3495 return -ENOMEM;
3496}
3497
3498static void __net_exit sock_inuse_exit_net(struct net *net)
3499{
3500 free_percpu(net->core.prot_inuse);
3501 free_percpu(net->core.sock_inuse);
3502}
3503
3504static struct pernet_operations net_inuse_ops = {
3505 .init = sock_inuse_init_net,
3506 .exit = sock_inuse_exit_net,
3507};
3508
3509static __init int net_inuse_init(void)
3510{
3511 if (register_pernet_subsys(&net_inuse_ops))
3512 panic("Cannot initialize net inuse counters");
3513
3514 return 0;
3515}
3516
3517core_initcall(net_inuse_init);
3518
3519static int assign_proto_idx(struct proto *prot)
3520{
3521 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
3522
3523 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
3524 pr_err("PROTO_INUSE_NR exhausted\n");
3525 return -ENOSPC;
3526 }
3527
3528 set_bit(prot->inuse_idx, proto_inuse_idx);
3529 return 0;
3530}
3531
3532static void release_proto_idx(struct proto *prot)
3533{
3534 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
3535 clear_bit(prot->inuse_idx, proto_inuse_idx);
3536}
3537#else
3538static inline int assign_proto_idx(struct proto *prot)
3539{
3540 return 0;
3541}
3542
3543static inline void release_proto_idx(struct proto *prot)
3544{
3545}
3546
3547static void sock_inuse_add(struct net *net, int val)
3548{
3549}
3550#endif
3551
3552static void tw_prot_cleanup(struct timewait_sock_ops *twsk_prot)
3553{
3554 if (!twsk_prot)
3555 return;
3556 kfree(twsk_prot->twsk_slab_name);
3557 twsk_prot->twsk_slab_name = NULL;
3558 kmem_cache_destroy(twsk_prot->twsk_slab);
3559 twsk_prot->twsk_slab = NULL;
3560}
3561
3562static int tw_prot_init(const struct proto *prot)
3563{
3564 struct timewait_sock_ops *twsk_prot = prot->twsk_prot;
3565
3566 if (!twsk_prot)
3567 return 0;
3568
3569 twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s",
3570 prot->name);
3571 if (!twsk_prot->twsk_slab_name)
3572 return -ENOMEM;
3573
3574 twsk_prot->twsk_slab =
3575 kmem_cache_create(twsk_prot->twsk_slab_name,
3576 twsk_prot->twsk_obj_size, 0,
3577 SLAB_ACCOUNT | prot->slab_flags,
3578 NULL);
3579 if (!twsk_prot->twsk_slab) {
3580 pr_crit("%s: Can't create timewait sock SLAB cache!\n",
3581 prot->name);
3582 return -ENOMEM;
3583 }
3584
3585 return 0;
3586}
3587
3588static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
3589{
3590 if (!rsk_prot)
3591 return;
3592 kfree(rsk_prot->slab_name);
3593 rsk_prot->slab_name = NULL;
3594 kmem_cache_destroy(rsk_prot->slab);
3595 rsk_prot->slab = NULL;
3596}
3597
3598static int req_prot_init(const struct proto *prot)
3599{
3600 struct request_sock_ops *rsk_prot = prot->rsk_prot;
3601
3602 if (!rsk_prot)
3603 return 0;
3604
3605 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
3606 prot->name);
3607 if (!rsk_prot->slab_name)
3608 return -ENOMEM;
3609
3610 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
3611 rsk_prot->obj_size, 0,
3612 SLAB_ACCOUNT | prot->slab_flags,
3613 NULL);
3614
3615 if (!rsk_prot->slab) {
3616 pr_crit("%s: Can't create request sock SLAB cache!\n",
3617 prot->name);
3618 return -ENOMEM;
3619 }
3620 return 0;
3621}
3622
3623int proto_register(struct proto *prot, int alloc_slab)
3624{
3625 int ret = -ENOBUFS;
3626
3627 if (alloc_slab) {
3628 prot->slab = kmem_cache_create_usercopy(prot->name,
3629 prot->obj_size, 0,
3630 SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT |
3631 prot->slab_flags,
3632 prot->useroffset, prot->usersize,
3633 NULL);
3634
3635 if (prot->slab == NULL) {
3636 pr_crit("%s: Can't create sock SLAB cache!\n",
3637 prot->name);
3638 goto out;
3639 }
3640
3641 if (req_prot_init(prot))
3642 goto out_free_request_sock_slab;
3643
3644 if (tw_prot_init(prot))
3645 goto out_free_timewait_sock_slab;
3646 }
3647
3648 mutex_lock(&proto_list_mutex);
3649 ret = assign_proto_idx(prot);
3650 if (ret) {
3651 mutex_unlock(&proto_list_mutex);
3652 goto out_free_timewait_sock_slab;
3653 }
3654 list_add(&prot->node, &proto_list);
3655 mutex_unlock(&proto_list_mutex);
3656 return ret;
3657
3658out_free_timewait_sock_slab:
3659 if (alloc_slab)
3660 tw_prot_cleanup(prot->twsk_prot);
3661out_free_request_sock_slab:
3662 if (alloc_slab) {
3663 req_prot_cleanup(prot->rsk_prot);
3664
3665 kmem_cache_destroy(prot->slab);
3666 prot->slab = NULL;
3667 }
3668out:
3669 return ret;
3670}
3671EXPORT_SYMBOL(proto_register);
3672
3673void proto_unregister(struct proto *prot)
3674{
3675 mutex_lock(&proto_list_mutex);
3676 release_proto_idx(prot);
3677 list_del(&prot->node);
3678 mutex_unlock(&proto_list_mutex);
3679
3680 kmem_cache_destroy(prot->slab);
3681 prot->slab = NULL;
3682
3683 req_prot_cleanup(prot->rsk_prot);
3684 tw_prot_cleanup(prot->twsk_prot);
3685}
3686EXPORT_SYMBOL(proto_unregister);
3687
3688int sock_load_diag_module(int family, int protocol)
3689{
3690 if (!protocol) {
3691 if (!sock_is_registered(family))
3692 return -ENOENT;
3693
3694 return request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
3695 NETLINK_SOCK_DIAG, family);
3696 }
3697
3698#ifdef CONFIG_INET
3699 if (family == AF_INET &&
3700 protocol != IPPROTO_RAW &&
3701 protocol < MAX_INET_PROTOS &&
3702 !rcu_access_pointer(inet_protos[protocol]))
3703 return -ENOENT;
3704#endif
3705
3706 return request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
3707 NETLINK_SOCK_DIAG, family, protocol);
3708}
3709EXPORT_SYMBOL(sock_load_diag_module);
3710
3711#ifdef CONFIG_PROC_FS
3712static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
3713 __acquires(proto_list_mutex)
3714{
3715 mutex_lock(&proto_list_mutex);
3716 return seq_list_start_head(&proto_list, *pos);
3717}
3718
3719static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3720{
3721 return seq_list_next(v, &proto_list, pos);
3722}
3723
3724static void proto_seq_stop(struct seq_file *seq, void *v)
3725 __releases(proto_list_mutex)
3726{
3727 mutex_unlock(&proto_list_mutex);
3728}
3729
3730static char proto_method_implemented(const void *method)
3731{
3732 return method == NULL ? 'n' : 'y';
3733}
3734static long sock_prot_memory_allocated(struct proto *proto)
3735{
3736 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
3737}
3738
3739static const char *sock_prot_memory_pressure(struct proto *proto)
3740{
3741 return proto->memory_pressure != NULL ?
3742 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
3743}
3744
3745static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
3746{
3747
3748 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
3749 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3750 proto->name,
3751 proto->obj_size,
3752 sock_prot_inuse_get(seq_file_net(seq), proto),
3753 sock_prot_memory_allocated(proto),
3754 sock_prot_memory_pressure(proto),
3755 proto->max_header,
3756 proto->slab == NULL ? "no" : "yes",
3757 module_name(proto->owner),
3758 proto_method_implemented(proto->close),
3759 proto_method_implemented(proto->connect),
3760 proto_method_implemented(proto->disconnect),
3761 proto_method_implemented(proto->accept),
3762 proto_method_implemented(proto->ioctl),
3763 proto_method_implemented(proto->init),
3764 proto_method_implemented(proto->destroy),
3765 proto_method_implemented(proto->shutdown),
3766 proto_method_implemented(proto->setsockopt),
3767 proto_method_implemented(proto->getsockopt),
3768 proto_method_implemented(proto->sendmsg),
3769 proto_method_implemented(proto->recvmsg),
3770 proto_method_implemented(proto->sendpage),
3771 proto_method_implemented(proto->bind),
3772 proto_method_implemented(proto->backlog_rcv),
3773 proto_method_implemented(proto->hash),
3774 proto_method_implemented(proto->unhash),
3775 proto_method_implemented(proto->get_port),
3776 proto_method_implemented(proto->enter_memory_pressure));
3777}
3778
3779static int proto_seq_show(struct seq_file *seq, void *v)
3780{
3781 if (v == &proto_list)
3782 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3783 "protocol",
3784 "size",
3785 "sockets",
3786 "memory",
3787 "press",
3788 "maxhdr",
3789 "slab",
3790 "module",
3791 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3792 else
3793 proto_seq_printf(seq, list_entry(v, struct proto, node));
3794 return 0;
3795}
3796
3797static const struct seq_operations proto_seq_ops = {
3798 .start = proto_seq_start,
3799 .next = proto_seq_next,
3800 .stop = proto_seq_stop,
3801 .show = proto_seq_show,
3802};
3803
3804static __net_init int proto_init_net(struct net *net)
3805{
3806 if (!proc_create_net("protocols", 0444, net->proc_net, &proto_seq_ops,
3807 sizeof(struct seq_net_private)))
3808 return -ENOMEM;
3809
3810 return 0;
3811}
3812
3813static __net_exit void proto_exit_net(struct net *net)
3814{
3815 remove_proc_entry("protocols", net->proc_net);
3816}
3817
3818
3819static __net_initdata struct pernet_operations proto_net_ops = {
3820 .init = proto_init_net,
3821 .exit = proto_exit_net,
3822};
3823
3824static int __init proto_init(void)
3825{
3826 return register_pernet_subsys(&proto_net_ops);
3827}
3828
3829subsys_initcall(proto_init);
3830
3831#endif /* PROC_FS */
3832
3833#ifdef CONFIG_NET_RX_BUSY_POLL
3834bool sk_busy_loop_end(void *p, unsigned long start_time)
3835{
3836 struct sock *sk = p;
3837
3838 return !skb_queue_empty_lockless(&sk->sk_receive_queue) ||
3839 sk_busy_loop_timeout(sk, start_time);
3840}
3841EXPORT_SYMBOL(sk_busy_loop_end);
3842#endif /* CONFIG_NET_RX_BUSY_POLL */
3843
3844int sock_bind_add(struct sock *sk, struct sockaddr *addr, int addr_len)
3845{
3846 if (!sk->sk_prot->bind_add)
3847 return -EOPNOTSUPP;
3848 return sk->sk_prot->bind_add(sk, addr, addr_len);
3849}
3850EXPORT_SYMBOL(sock_bind_add);
1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
10 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
35 * code. The ACK stuff can wait and needs major
36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 *
85 *
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
90 */
91
92#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
93
94#include <linux/capability.h>
95#include <linux/errno.h>
96#include <linux/errqueue.h>
97#include <linux/types.h>
98#include <linux/socket.h>
99#include <linux/in.h>
100#include <linux/kernel.h>
101#include <linux/module.h>
102#include <linux/proc_fs.h>
103#include <linux/seq_file.h>
104#include <linux/sched.h>
105#include <linux/timer.h>
106#include <linux/string.h>
107#include <linux/sockios.h>
108#include <linux/net.h>
109#include <linux/mm.h>
110#include <linux/slab.h>
111#include <linux/interrupt.h>
112#include <linux/poll.h>
113#include <linux/tcp.h>
114#include <linux/init.h>
115#include <linux/highmem.h>
116#include <linux/user_namespace.h>
117#include <linux/static_key.h>
118#include <linux/memcontrol.h>
119#include <linux/prefetch.h>
120
121#include <asm/uaccess.h>
122
123#include <linux/netdevice.h>
124#include <net/protocol.h>
125#include <linux/skbuff.h>
126#include <net/net_namespace.h>
127#include <net/request_sock.h>
128#include <net/sock.h>
129#include <linux/net_tstamp.h>
130#include <net/xfrm.h>
131#include <linux/ipsec.h>
132#include <net/cls_cgroup.h>
133#include <net/netprio_cgroup.h>
134#include <linux/sock_diag.h>
135
136#include <linux/filter.h>
137#include <net/sock_reuseport.h>
138
139#include <trace/events/sock.h>
140
141#ifdef CONFIG_INET
142#include <net/tcp.h>
143#endif
144
145#include <net/busy_poll.h>
146
147static DEFINE_MUTEX(proto_list_mutex);
148static LIST_HEAD(proto_list);
149
150/**
151 * sk_ns_capable - General socket capability test
152 * @sk: Socket to use a capability on or through
153 * @user_ns: The user namespace of the capability to use
154 * @cap: The capability to use
155 *
156 * Test to see if the opener of the socket had when the socket was
157 * created and the current process has the capability @cap in the user
158 * namespace @user_ns.
159 */
160bool sk_ns_capable(const struct sock *sk,
161 struct user_namespace *user_ns, int cap)
162{
163 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
164 ns_capable(user_ns, cap);
165}
166EXPORT_SYMBOL(sk_ns_capable);
167
168/**
169 * sk_capable - Socket global capability test
170 * @sk: Socket to use a capability on or through
171 * @cap: The global capability to use
172 *
173 * Test to see if the opener of the socket had when the socket was
174 * created and the current process has the capability @cap in all user
175 * namespaces.
176 */
177bool sk_capable(const struct sock *sk, int cap)
178{
179 return sk_ns_capable(sk, &init_user_ns, cap);
180}
181EXPORT_SYMBOL(sk_capable);
182
183/**
184 * sk_net_capable - Network namespace socket capability test
185 * @sk: Socket to use a capability on or through
186 * @cap: The capability to use
187 *
188 * Test to see if the opener of the socket had when the socket was created
189 * and the current process has the capability @cap over the network namespace
190 * the socket is a member of.
191 */
192bool sk_net_capable(const struct sock *sk, int cap)
193{
194 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
195}
196EXPORT_SYMBOL(sk_net_capable);
197
198/*
199 * Each address family might have different locking rules, so we have
200 * one slock key per address family:
201 */
202static struct lock_class_key af_family_keys[AF_MAX];
203static struct lock_class_key af_family_slock_keys[AF_MAX];
204
205/*
206 * Make lock validator output more readable. (we pre-construct these
207 * strings build-time, so that runtime initialization of socket
208 * locks is fast):
209 */
210static const char *const af_family_key_strings[AF_MAX+1] = {
211 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
212 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
213 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
214 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
215 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
216 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
217 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
218 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
219 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
220 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
221 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
222 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
223 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
224 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_KCM" ,
225 "sk_lock-AF_MAX"
226};
227static const char *const af_family_slock_key_strings[AF_MAX+1] = {
228 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
229 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
230 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
231 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
232 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
233 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
234 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
235 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
236 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
237 "slock-27" , "slock-28" , "slock-AF_CAN" ,
238 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
239 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
240 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
241 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_KCM" ,
242 "slock-AF_MAX"
243};
244static const char *const af_family_clock_key_strings[AF_MAX+1] = {
245 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
246 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
247 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
248 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
249 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
250 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
251 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
252 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
253 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
254 "clock-27" , "clock-28" , "clock-AF_CAN" ,
255 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
256 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
257 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
258 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_KCM" ,
259 "clock-AF_MAX"
260};
261
262/*
263 * sk_callback_lock locking rules are per-address-family,
264 * so split the lock classes by using a per-AF key:
265 */
266static struct lock_class_key af_callback_keys[AF_MAX];
267
268/* Take into consideration the size of the struct sk_buff overhead in the
269 * determination of these values, since that is non-constant across
270 * platforms. This makes socket queueing behavior and performance
271 * not depend upon such differences.
272 */
273#define _SK_MEM_PACKETS 256
274#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
275#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
276#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
277
278/* Run time adjustable parameters. */
279__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
280EXPORT_SYMBOL(sysctl_wmem_max);
281__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
282EXPORT_SYMBOL(sysctl_rmem_max);
283__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
284__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
285
286/* Maximal space eaten by iovec or ancillary data plus some space */
287int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
288EXPORT_SYMBOL(sysctl_optmem_max);
289
290int sysctl_tstamp_allow_data __read_mostly = 1;
291
292struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
293EXPORT_SYMBOL_GPL(memalloc_socks);
294
295/**
296 * sk_set_memalloc - sets %SOCK_MEMALLOC
297 * @sk: socket to set it on
298 *
299 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
300 * It's the responsibility of the admin to adjust min_free_kbytes
301 * to meet the requirements
302 */
303void sk_set_memalloc(struct sock *sk)
304{
305 sock_set_flag(sk, SOCK_MEMALLOC);
306 sk->sk_allocation |= __GFP_MEMALLOC;
307 static_key_slow_inc(&memalloc_socks);
308}
309EXPORT_SYMBOL_GPL(sk_set_memalloc);
310
311void sk_clear_memalloc(struct sock *sk)
312{
313 sock_reset_flag(sk, SOCK_MEMALLOC);
314 sk->sk_allocation &= ~__GFP_MEMALLOC;
315 static_key_slow_dec(&memalloc_socks);
316
317 /*
318 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
319 * progress of swapping. SOCK_MEMALLOC may be cleared while
320 * it has rmem allocations due to the last swapfile being deactivated
321 * but there is a risk that the socket is unusable due to exceeding
322 * the rmem limits. Reclaim the reserves and obey rmem limits again.
323 */
324 sk_mem_reclaim(sk);
325}
326EXPORT_SYMBOL_GPL(sk_clear_memalloc);
327
328int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
329{
330 int ret;
331 unsigned long pflags = current->flags;
332
333 /* these should have been dropped before queueing */
334 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
335
336 current->flags |= PF_MEMALLOC;
337 ret = sk->sk_backlog_rcv(sk, skb);
338 tsk_restore_flags(current, pflags, PF_MEMALLOC);
339
340 return ret;
341}
342EXPORT_SYMBOL(__sk_backlog_rcv);
343
344static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
345{
346 struct timeval tv;
347
348 if (optlen < sizeof(tv))
349 return -EINVAL;
350 if (copy_from_user(&tv, optval, sizeof(tv)))
351 return -EFAULT;
352 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
353 return -EDOM;
354
355 if (tv.tv_sec < 0) {
356 static int warned __read_mostly;
357
358 *timeo_p = 0;
359 if (warned < 10 && net_ratelimit()) {
360 warned++;
361 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
362 __func__, current->comm, task_pid_nr(current));
363 }
364 return 0;
365 }
366 *timeo_p = MAX_SCHEDULE_TIMEOUT;
367 if (tv.tv_sec == 0 && tv.tv_usec == 0)
368 return 0;
369 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
370 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
371 return 0;
372}
373
374static void sock_warn_obsolete_bsdism(const char *name)
375{
376 static int warned;
377 static char warncomm[TASK_COMM_LEN];
378 if (strcmp(warncomm, current->comm) && warned < 5) {
379 strcpy(warncomm, current->comm);
380 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
381 warncomm, name);
382 warned++;
383 }
384}
385
386static bool sock_needs_netstamp(const struct sock *sk)
387{
388 switch (sk->sk_family) {
389 case AF_UNSPEC:
390 case AF_UNIX:
391 return false;
392 default:
393 return true;
394 }
395}
396
397static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
398{
399 if (sk->sk_flags & flags) {
400 sk->sk_flags &= ~flags;
401 if (sock_needs_netstamp(sk) &&
402 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
403 net_disable_timestamp();
404 }
405}
406
407
408int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
409{
410 int err;
411 unsigned long flags;
412 struct sk_buff_head *list = &sk->sk_receive_queue;
413
414 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
415 atomic_inc(&sk->sk_drops);
416 trace_sock_rcvqueue_full(sk, skb);
417 return -ENOMEM;
418 }
419
420 err = sk_filter(sk, skb);
421 if (err)
422 return err;
423
424 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
425 atomic_inc(&sk->sk_drops);
426 return -ENOBUFS;
427 }
428
429 skb->dev = NULL;
430 skb_set_owner_r(skb, sk);
431
432 /* we escape from rcu protected region, make sure we dont leak
433 * a norefcounted dst
434 */
435 skb_dst_force(skb);
436
437 spin_lock_irqsave(&list->lock, flags);
438 sock_skb_set_dropcount(sk, skb);
439 __skb_queue_tail(list, skb);
440 spin_unlock_irqrestore(&list->lock, flags);
441
442 if (!sock_flag(sk, SOCK_DEAD))
443 sk->sk_data_ready(sk);
444 return 0;
445}
446EXPORT_SYMBOL(sock_queue_rcv_skb);
447
448int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
449{
450 int rc = NET_RX_SUCCESS;
451
452 if (sk_filter(sk, skb))
453 goto discard_and_relse;
454
455 skb->dev = NULL;
456
457 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
458 atomic_inc(&sk->sk_drops);
459 goto discard_and_relse;
460 }
461 if (nested)
462 bh_lock_sock_nested(sk);
463 else
464 bh_lock_sock(sk);
465 if (!sock_owned_by_user(sk)) {
466 /*
467 * trylock + unlock semantics:
468 */
469 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
470
471 rc = sk_backlog_rcv(sk, skb);
472
473 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
474 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
475 bh_unlock_sock(sk);
476 atomic_inc(&sk->sk_drops);
477 goto discard_and_relse;
478 }
479
480 bh_unlock_sock(sk);
481out:
482 sock_put(sk);
483 return rc;
484discard_and_relse:
485 kfree_skb(skb);
486 goto out;
487}
488EXPORT_SYMBOL(sk_receive_skb);
489
490struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
491{
492 struct dst_entry *dst = __sk_dst_get(sk);
493
494 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
495 sk_tx_queue_clear(sk);
496 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
497 dst_release(dst);
498 return NULL;
499 }
500
501 return dst;
502}
503EXPORT_SYMBOL(__sk_dst_check);
504
505struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
506{
507 struct dst_entry *dst = sk_dst_get(sk);
508
509 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
510 sk_dst_reset(sk);
511 dst_release(dst);
512 return NULL;
513 }
514
515 return dst;
516}
517EXPORT_SYMBOL(sk_dst_check);
518
519static int sock_setbindtodevice(struct sock *sk, char __user *optval,
520 int optlen)
521{
522 int ret = -ENOPROTOOPT;
523#ifdef CONFIG_NETDEVICES
524 struct net *net = sock_net(sk);
525 char devname[IFNAMSIZ];
526 int index;
527
528 /* Sorry... */
529 ret = -EPERM;
530 if (!ns_capable(net->user_ns, CAP_NET_RAW))
531 goto out;
532
533 ret = -EINVAL;
534 if (optlen < 0)
535 goto out;
536
537 /* Bind this socket to a particular device like "eth0",
538 * as specified in the passed interface name. If the
539 * name is "" or the option length is zero the socket
540 * is not bound.
541 */
542 if (optlen > IFNAMSIZ - 1)
543 optlen = IFNAMSIZ - 1;
544 memset(devname, 0, sizeof(devname));
545
546 ret = -EFAULT;
547 if (copy_from_user(devname, optval, optlen))
548 goto out;
549
550 index = 0;
551 if (devname[0] != '\0') {
552 struct net_device *dev;
553
554 rcu_read_lock();
555 dev = dev_get_by_name_rcu(net, devname);
556 if (dev)
557 index = dev->ifindex;
558 rcu_read_unlock();
559 ret = -ENODEV;
560 if (!dev)
561 goto out;
562 }
563
564 lock_sock(sk);
565 sk->sk_bound_dev_if = index;
566 sk_dst_reset(sk);
567 release_sock(sk);
568
569 ret = 0;
570
571out:
572#endif
573
574 return ret;
575}
576
577static int sock_getbindtodevice(struct sock *sk, char __user *optval,
578 int __user *optlen, int len)
579{
580 int ret = -ENOPROTOOPT;
581#ifdef CONFIG_NETDEVICES
582 struct net *net = sock_net(sk);
583 char devname[IFNAMSIZ];
584
585 if (sk->sk_bound_dev_if == 0) {
586 len = 0;
587 goto zero;
588 }
589
590 ret = -EINVAL;
591 if (len < IFNAMSIZ)
592 goto out;
593
594 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
595 if (ret)
596 goto out;
597
598 len = strlen(devname) + 1;
599
600 ret = -EFAULT;
601 if (copy_to_user(optval, devname, len))
602 goto out;
603
604zero:
605 ret = -EFAULT;
606 if (put_user(len, optlen))
607 goto out;
608
609 ret = 0;
610
611out:
612#endif
613
614 return ret;
615}
616
617static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
618{
619 if (valbool)
620 sock_set_flag(sk, bit);
621 else
622 sock_reset_flag(sk, bit);
623}
624
625bool sk_mc_loop(struct sock *sk)
626{
627 if (dev_recursion_level())
628 return false;
629 if (!sk)
630 return true;
631 switch (sk->sk_family) {
632 case AF_INET:
633 return inet_sk(sk)->mc_loop;
634#if IS_ENABLED(CONFIG_IPV6)
635 case AF_INET6:
636 return inet6_sk(sk)->mc_loop;
637#endif
638 }
639 WARN_ON(1);
640 return true;
641}
642EXPORT_SYMBOL(sk_mc_loop);
643
644/*
645 * This is meant for all protocols to use and covers goings on
646 * at the socket level. Everything here is generic.
647 */
648
649int sock_setsockopt(struct socket *sock, int level, int optname,
650 char __user *optval, unsigned int optlen)
651{
652 struct sock *sk = sock->sk;
653 int val;
654 int valbool;
655 struct linger ling;
656 int ret = 0;
657
658 /*
659 * Options without arguments
660 */
661
662 if (optname == SO_BINDTODEVICE)
663 return sock_setbindtodevice(sk, optval, optlen);
664
665 if (optlen < sizeof(int))
666 return -EINVAL;
667
668 if (get_user(val, (int __user *)optval))
669 return -EFAULT;
670
671 valbool = val ? 1 : 0;
672
673 lock_sock(sk);
674
675 switch (optname) {
676 case SO_DEBUG:
677 if (val && !capable(CAP_NET_ADMIN))
678 ret = -EACCES;
679 else
680 sock_valbool_flag(sk, SOCK_DBG, valbool);
681 break;
682 case SO_REUSEADDR:
683 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
684 break;
685 case SO_REUSEPORT:
686 sk->sk_reuseport = valbool;
687 break;
688 case SO_TYPE:
689 case SO_PROTOCOL:
690 case SO_DOMAIN:
691 case SO_ERROR:
692 ret = -ENOPROTOOPT;
693 break;
694 case SO_DONTROUTE:
695 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
696 break;
697 case SO_BROADCAST:
698 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
699 break;
700 case SO_SNDBUF:
701 /* Don't error on this BSD doesn't and if you think
702 * about it this is right. Otherwise apps have to
703 * play 'guess the biggest size' games. RCVBUF/SNDBUF
704 * are treated in BSD as hints
705 */
706 val = min_t(u32, val, sysctl_wmem_max);
707set_sndbuf:
708 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
709 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
710 /* Wake up sending tasks if we upped the value. */
711 sk->sk_write_space(sk);
712 break;
713
714 case SO_SNDBUFFORCE:
715 if (!capable(CAP_NET_ADMIN)) {
716 ret = -EPERM;
717 break;
718 }
719 goto set_sndbuf;
720
721 case SO_RCVBUF:
722 /* Don't error on this BSD doesn't and if you think
723 * about it this is right. Otherwise apps have to
724 * play 'guess the biggest size' games. RCVBUF/SNDBUF
725 * are treated in BSD as hints
726 */
727 val = min_t(u32, val, sysctl_rmem_max);
728set_rcvbuf:
729 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
730 /*
731 * We double it on the way in to account for
732 * "struct sk_buff" etc. overhead. Applications
733 * assume that the SO_RCVBUF setting they make will
734 * allow that much actual data to be received on that
735 * socket.
736 *
737 * Applications are unaware that "struct sk_buff" and
738 * other overheads allocate from the receive buffer
739 * during socket buffer allocation.
740 *
741 * And after considering the possible alternatives,
742 * returning the value we actually used in getsockopt
743 * is the most desirable behavior.
744 */
745 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
746 break;
747
748 case SO_RCVBUFFORCE:
749 if (!capable(CAP_NET_ADMIN)) {
750 ret = -EPERM;
751 break;
752 }
753 goto set_rcvbuf;
754
755 case SO_KEEPALIVE:
756#ifdef CONFIG_INET
757 if (sk->sk_protocol == IPPROTO_TCP &&
758 sk->sk_type == SOCK_STREAM)
759 tcp_set_keepalive(sk, valbool);
760#endif
761 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
762 break;
763
764 case SO_OOBINLINE:
765 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
766 break;
767
768 case SO_NO_CHECK:
769 sk->sk_no_check_tx = valbool;
770 break;
771
772 case SO_PRIORITY:
773 if ((val >= 0 && val <= 6) ||
774 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
775 sk->sk_priority = val;
776 else
777 ret = -EPERM;
778 break;
779
780 case SO_LINGER:
781 if (optlen < sizeof(ling)) {
782 ret = -EINVAL; /* 1003.1g */
783 break;
784 }
785 if (copy_from_user(&ling, optval, sizeof(ling))) {
786 ret = -EFAULT;
787 break;
788 }
789 if (!ling.l_onoff)
790 sock_reset_flag(sk, SOCK_LINGER);
791 else {
792#if (BITS_PER_LONG == 32)
793 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
794 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
795 else
796#endif
797 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
798 sock_set_flag(sk, SOCK_LINGER);
799 }
800 break;
801
802 case SO_BSDCOMPAT:
803 sock_warn_obsolete_bsdism("setsockopt");
804 break;
805
806 case SO_PASSCRED:
807 if (valbool)
808 set_bit(SOCK_PASSCRED, &sock->flags);
809 else
810 clear_bit(SOCK_PASSCRED, &sock->flags);
811 break;
812
813 case SO_TIMESTAMP:
814 case SO_TIMESTAMPNS:
815 if (valbool) {
816 if (optname == SO_TIMESTAMP)
817 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
818 else
819 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
820 sock_set_flag(sk, SOCK_RCVTSTAMP);
821 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
822 } else {
823 sock_reset_flag(sk, SOCK_RCVTSTAMP);
824 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
825 }
826 break;
827
828 case SO_TIMESTAMPING:
829 if (val & ~SOF_TIMESTAMPING_MASK) {
830 ret = -EINVAL;
831 break;
832 }
833
834 if (val & SOF_TIMESTAMPING_OPT_ID &&
835 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
836 if (sk->sk_protocol == IPPROTO_TCP &&
837 sk->sk_type == SOCK_STREAM) {
838 if (sk->sk_state != TCP_ESTABLISHED) {
839 ret = -EINVAL;
840 break;
841 }
842 sk->sk_tskey = tcp_sk(sk)->snd_una;
843 } else {
844 sk->sk_tskey = 0;
845 }
846 }
847 sk->sk_tsflags = val;
848 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
849 sock_enable_timestamp(sk,
850 SOCK_TIMESTAMPING_RX_SOFTWARE);
851 else
852 sock_disable_timestamp(sk,
853 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
854 break;
855
856 case SO_RCVLOWAT:
857 if (val < 0)
858 val = INT_MAX;
859 sk->sk_rcvlowat = val ? : 1;
860 break;
861
862 case SO_RCVTIMEO:
863 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
864 break;
865
866 case SO_SNDTIMEO:
867 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
868 break;
869
870 case SO_ATTACH_FILTER:
871 ret = -EINVAL;
872 if (optlen == sizeof(struct sock_fprog)) {
873 struct sock_fprog fprog;
874
875 ret = -EFAULT;
876 if (copy_from_user(&fprog, optval, sizeof(fprog)))
877 break;
878
879 ret = sk_attach_filter(&fprog, sk);
880 }
881 break;
882
883 case SO_ATTACH_BPF:
884 ret = -EINVAL;
885 if (optlen == sizeof(u32)) {
886 u32 ufd;
887
888 ret = -EFAULT;
889 if (copy_from_user(&ufd, optval, sizeof(ufd)))
890 break;
891
892 ret = sk_attach_bpf(ufd, sk);
893 }
894 break;
895
896 case SO_ATTACH_REUSEPORT_CBPF:
897 ret = -EINVAL;
898 if (optlen == sizeof(struct sock_fprog)) {
899 struct sock_fprog fprog;
900
901 ret = -EFAULT;
902 if (copy_from_user(&fprog, optval, sizeof(fprog)))
903 break;
904
905 ret = sk_reuseport_attach_filter(&fprog, sk);
906 }
907 break;
908
909 case SO_ATTACH_REUSEPORT_EBPF:
910 ret = -EINVAL;
911 if (optlen == sizeof(u32)) {
912 u32 ufd;
913
914 ret = -EFAULT;
915 if (copy_from_user(&ufd, optval, sizeof(ufd)))
916 break;
917
918 ret = sk_reuseport_attach_bpf(ufd, sk);
919 }
920 break;
921
922 case SO_DETACH_FILTER:
923 ret = sk_detach_filter(sk);
924 break;
925
926 case SO_LOCK_FILTER:
927 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
928 ret = -EPERM;
929 else
930 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
931 break;
932
933 case SO_PASSSEC:
934 if (valbool)
935 set_bit(SOCK_PASSSEC, &sock->flags);
936 else
937 clear_bit(SOCK_PASSSEC, &sock->flags);
938 break;
939 case SO_MARK:
940 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
941 ret = -EPERM;
942 else
943 sk->sk_mark = val;
944 break;
945
946 case SO_RXQ_OVFL:
947 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
948 break;
949
950 case SO_WIFI_STATUS:
951 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
952 break;
953
954 case SO_PEEK_OFF:
955 if (sock->ops->set_peek_off)
956 ret = sock->ops->set_peek_off(sk, val);
957 else
958 ret = -EOPNOTSUPP;
959 break;
960
961 case SO_NOFCS:
962 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
963 break;
964
965 case SO_SELECT_ERR_QUEUE:
966 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
967 break;
968
969#ifdef CONFIG_NET_RX_BUSY_POLL
970 case SO_BUSY_POLL:
971 /* allow unprivileged users to decrease the value */
972 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
973 ret = -EPERM;
974 else {
975 if (val < 0)
976 ret = -EINVAL;
977 else
978 sk->sk_ll_usec = val;
979 }
980 break;
981#endif
982
983 case SO_MAX_PACING_RATE:
984 sk->sk_max_pacing_rate = val;
985 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
986 sk->sk_max_pacing_rate);
987 break;
988
989 case SO_INCOMING_CPU:
990 sk->sk_incoming_cpu = val;
991 break;
992
993 case SO_CNX_ADVICE:
994 if (val == 1)
995 dst_negative_advice(sk);
996 break;
997 default:
998 ret = -ENOPROTOOPT;
999 break;
1000 }
1001 release_sock(sk);
1002 return ret;
1003}
1004EXPORT_SYMBOL(sock_setsockopt);
1005
1006
1007static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1008 struct ucred *ucred)
1009{
1010 ucred->pid = pid_vnr(pid);
1011 ucred->uid = ucred->gid = -1;
1012 if (cred) {
1013 struct user_namespace *current_ns = current_user_ns();
1014
1015 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1016 ucred->gid = from_kgid_munged(current_ns, cred->egid);
1017 }
1018}
1019
1020int sock_getsockopt(struct socket *sock, int level, int optname,
1021 char __user *optval, int __user *optlen)
1022{
1023 struct sock *sk = sock->sk;
1024
1025 union {
1026 int val;
1027 struct linger ling;
1028 struct timeval tm;
1029 } v;
1030
1031 int lv = sizeof(int);
1032 int len;
1033
1034 if (get_user(len, optlen))
1035 return -EFAULT;
1036 if (len < 0)
1037 return -EINVAL;
1038
1039 memset(&v, 0, sizeof(v));
1040
1041 switch (optname) {
1042 case SO_DEBUG:
1043 v.val = sock_flag(sk, SOCK_DBG);
1044 break;
1045
1046 case SO_DONTROUTE:
1047 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1048 break;
1049
1050 case SO_BROADCAST:
1051 v.val = sock_flag(sk, SOCK_BROADCAST);
1052 break;
1053
1054 case SO_SNDBUF:
1055 v.val = sk->sk_sndbuf;
1056 break;
1057
1058 case SO_RCVBUF:
1059 v.val = sk->sk_rcvbuf;
1060 break;
1061
1062 case SO_REUSEADDR:
1063 v.val = sk->sk_reuse;
1064 break;
1065
1066 case SO_REUSEPORT:
1067 v.val = sk->sk_reuseport;
1068 break;
1069
1070 case SO_KEEPALIVE:
1071 v.val = sock_flag(sk, SOCK_KEEPOPEN);
1072 break;
1073
1074 case SO_TYPE:
1075 v.val = sk->sk_type;
1076 break;
1077
1078 case SO_PROTOCOL:
1079 v.val = sk->sk_protocol;
1080 break;
1081
1082 case SO_DOMAIN:
1083 v.val = sk->sk_family;
1084 break;
1085
1086 case SO_ERROR:
1087 v.val = -sock_error(sk);
1088 if (v.val == 0)
1089 v.val = xchg(&sk->sk_err_soft, 0);
1090 break;
1091
1092 case SO_OOBINLINE:
1093 v.val = sock_flag(sk, SOCK_URGINLINE);
1094 break;
1095
1096 case SO_NO_CHECK:
1097 v.val = sk->sk_no_check_tx;
1098 break;
1099
1100 case SO_PRIORITY:
1101 v.val = sk->sk_priority;
1102 break;
1103
1104 case SO_LINGER:
1105 lv = sizeof(v.ling);
1106 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
1107 v.ling.l_linger = sk->sk_lingertime / HZ;
1108 break;
1109
1110 case SO_BSDCOMPAT:
1111 sock_warn_obsolete_bsdism("getsockopt");
1112 break;
1113
1114 case SO_TIMESTAMP:
1115 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1116 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1117 break;
1118
1119 case SO_TIMESTAMPNS:
1120 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
1121 break;
1122
1123 case SO_TIMESTAMPING:
1124 v.val = sk->sk_tsflags;
1125 break;
1126
1127 case SO_RCVTIMEO:
1128 lv = sizeof(struct timeval);
1129 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1130 v.tm.tv_sec = 0;
1131 v.tm.tv_usec = 0;
1132 } else {
1133 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1134 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1135 }
1136 break;
1137
1138 case SO_SNDTIMEO:
1139 lv = sizeof(struct timeval);
1140 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1141 v.tm.tv_sec = 0;
1142 v.tm.tv_usec = 0;
1143 } else {
1144 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1145 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1146 }
1147 break;
1148
1149 case SO_RCVLOWAT:
1150 v.val = sk->sk_rcvlowat;
1151 break;
1152
1153 case SO_SNDLOWAT:
1154 v.val = 1;
1155 break;
1156
1157 case SO_PASSCRED:
1158 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1159 break;
1160
1161 case SO_PEERCRED:
1162 {
1163 struct ucred peercred;
1164 if (len > sizeof(peercred))
1165 len = sizeof(peercred);
1166 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1167 if (copy_to_user(optval, &peercred, len))
1168 return -EFAULT;
1169 goto lenout;
1170 }
1171
1172 case SO_PEERNAME:
1173 {
1174 char address[128];
1175
1176 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1177 return -ENOTCONN;
1178 if (lv < len)
1179 return -EINVAL;
1180 if (copy_to_user(optval, address, len))
1181 return -EFAULT;
1182 goto lenout;
1183 }
1184
1185 /* Dubious BSD thing... Probably nobody even uses it, but
1186 * the UNIX standard wants it for whatever reason... -DaveM
1187 */
1188 case SO_ACCEPTCONN:
1189 v.val = sk->sk_state == TCP_LISTEN;
1190 break;
1191
1192 case SO_PASSSEC:
1193 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1194 break;
1195
1196 case SO_PEERSEC:
1197 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1198
1199 case SO_MARK:
1200 v.val = sk->sk_mark;
1201 break;
1202
1203 case SO_RXQ_OVFL:
1204 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1205 break;
1206
1207 case SO_WIFI_STATUS:
1208 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1209 break;
1210
1211 case SO_PEEK_OFF:
1212 if (!sock->ops->set_peek_off)
1213 return -EOPNOTSUPP;
1214
1215 v.val = sk->sk_peek_off;
1216 break;
1217 case SO_NOFCS:
1218 v.val = sock_flag(sk, SOCK_NOFCS);
1219 break;
1220
1221 case SO_BINDTODEVICE:
1222 return sock_getbindtodevice(sk, optval, optlen, len);
1223
1224 case SO_GET_FILTER:
1225 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1226 if (len < 0)
1227 return len;
1228
1229 goto lenout;
1230
1231 case SO_LOCK_FILTER:
1232 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1233 break;
1234
1235 case SO_BPF_EXTENSIONS:
1236 v.val = bpf_tell_extensions();
1237 break;
1238
1239 case SO_SELECT_ERR_QUEUE:
1240 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1241 break;
1242
1243#ifdef CONFIG_NET_RX_BUSY_POLL
1244 case SO_BUSY_POLL:
1245 v.val = sk->sk_ll_usec;
1246 break;
1247#endif
1248
1249 case SO_MAX_PACING_RATE:
1250 v.val = sk->sk_max_pacing_rate;
1251 break;
1252
1253 case SO_INCOMING_CPU:
1254 v.val = sk->sk_incoming_cpu;
1255 break;
1256
1257 default:
1258 /* We implement the SO_SNDLOWAT etc to not be settable
1259 * (1003.1g 7).
1260 */
1261 return -ENOPROTOOPT;
1262 }
1263
1264 if (len > lv)
1265 len = lv;
1266 if (copy_to_user(optval, &v, len))
1267 return -EFAULT;
1268lenout:
1269 if (put_user(len, optlen))
1270 return -EFAULT;
1271 return 0;
1272}
1273
1274/*
1275 * Initialize an sk_lock.
1276 *
1277 * (We also register the sk_lock with the lock validator.)
1278 */
1279static inline void sock_lock_init(struct sock *sk)
1280{
1281 sock_lock_init_class_and_name(sk,
1282 af_family_slock_key_strings[sk->sk_family],
1283 af_family_slock_keys + sk->sk_family,
1284 af_family_key_strings[sk->sk_family],
1285 af_family_keys + sk->sk_family);
1286}
1287
1288/*
1289 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1290 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1291 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1292 */
1293static void sock_copy(struct sock *nsk, const struct sock *osk)
1294{
1295#ifdef CONFIG_SECURITY_NETWORK
1296 void *sptr = nsk->sk_security;
1297#endif
1298 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1299
1300 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1301 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1302
1303#ifdef CONFIG_SECURITY_NETWORK
1304 nsk->sk_security = sptr;
1305 security_sk_clone(osk, nsk);
1306#endif
1307}
1308
1309void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1310{
1311 unsigned long nulls1, nulls2;
1312
1313 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1314 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1315 if (nulls1 > nulls2)
1316 swap(nulls1, nulls2);
1317
1318 if (nulls1 != 0)
1319 memset((char *)sk, 0, nulls1);
1320 memset((char *)sk + nulls1 + sizeof(void *), 0,
1321 nulls2 - nulls1 - sizeof(void *));
1322 memset((char *)sk + nulls2 + sizeof(void *), 0,
1323 size - nulls2 - sizeof(void *));
1324}
1325EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1326
1327static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1328 int family)
1329{
1330 struct sock *sk;
1331 struct kmem_cache *slab;
1332
1333 slab = prot->slab;
1334 if (slab != NULL) {
1335 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1336 if (!sk)
1337 return sk;
1338 if (priority & __GFP_ZERO) {
1339 if (prot->clear_sk)
1340 prot->clear_sk(sk, prot->obj_size);
1341 else
1342 sk_prot_clear_nulls(sk, prot->obj_size);
1343 }
1344 } else
1345 sk = kmalloc(prot->obj_size, priority);
1346
1347 if (sk != NULL) {
1348 kmemcheck_annotate_bitfield(sk, flags);
1349
1350 if (security_sk_alloc(sk, family, priority))
1351 goto out_free;
1352
1353 if (!try_module_get(prot->owner))
1354 goto out_free_sec;
1355 sk_tx_queue_clear(sk);
1356 cgroup_sk_alloc(&sk->sk_cgrp_data);
1357 }
1358
1359 return sk;
1360
1361out_free_sec:
1362 security_sk_free(sk);
1363out_free:
1364 if (slab != NULL)
1365 kmem_cache_free(slab, sk);
1366 else
1367 kfree(sk);
1368 return NULL;
1369}
1370
1371static void sk_prot_free(struct proto *prot, struct sock *sk)
1372{
1373 struct kmem_cache *slab;
1374 struct module *owner;
1375
1376 owner = prot->owner;
1377 slab = prot->slab;
1378
1379 cgroup_sk_free(&sk->sk_cgrp_data);
1380 security_sk_free(sk);
1381 if (slab != NULL)
1382 kmem_cache_free(slab, sk);
1383 else
1384 kfree(sk);
1385 module_put(owner);
1386}
1387
1388/**
1389 * sk_alloc - All socket objects are allocated here
1390 * @net: the applicable net namespace
1391 * @family: protocol family
1392 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1393 * @prot: struct proto associated with this new sock instance
1394 * @kern: is this to be a kernel socket?
1395 */
1396struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1397 struct proto *prot, int kern)
1398{
1399 struct sock *sk;
1400
1401 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1402 if (sk) {
1403 sk->sk_family = family;
1404 /*
1405 * See comment in struct sock definition to understand
1406 * why we need sk_prot_creator -acme
1407 */
1408 sk->sk_prot = sk->sk_prot_creator = prot;
1409 sock_lock_init(sk);
1410 sk->sk_net_refcnt = kern ? 0 : 1;
1411 if (likely(sk->sk_net_refcnt))
1412 get_net(net);
1413 sock_net_set(sk, net);
1414 atomic_set(&sk->sk_wmem_alloc, 1);
1415
1416 sock_update_classid(&sk->sk_cgrp_data);
1417 sock_update_netprioidx(&sk->sk_cgrp_data);
1418 }
1419
1420 return sk;
1421}
1422EXPORT_SYMBOL(sk_alloc);
1423
1424void sk_destruct(struct sock *sk)
1425{
1426 struct sk_filter *filter;
1427
1428 if (sk->sk_destruct)
1429 sk->sk_destruct(sk);
1430
1431 filter = rcu_dereference_check(sk->sk_filter,
1432 atomic_read(&sk->sk_wmem_alloc) == 0);
1433 if (filter) {
1434 sk_filter_uncharge(sk, filter);
1435 RCU_INIT_POINTER(sk->sk_filter, NULL);
1436 }
1437 if (rcu_access_pointer(sk->sk_reuseport_cb))
1438 reuseport_detach_sock(sk);
1439
1440 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1441
1442 if (atomic_read(&sk->sk_omem_alloc))
1443 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1444 __func__, atomic_read(&sk->sk_omem_alloc));
1445
1446 if (sk->sk_peer_cred)
1447 put_cred(sk->sk_peer_cred);
1448 put_pid(sk->sk_peer_pid);
1449 if (likely(sk->sk_net_refcnt))
1450 put_net(sock_net(sk));
1451 sk_prot_free(sk->sk_prot_creator, sk);
1452}
1453
1454static void __sk_free(struct sock *sk)
1455{
1456 if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt))
1457 sock_diag_broadcast_destroy(sk);
1458 else
1459 sk_destruct(sk);
1460}
1461
1462void sk_free(struct sock *sk)
1463{
1464 /*
1465 * We subtract one from sk_wmem_alloc and can know if
1466 * some packets are still in some tx queue.
1467 * If not null, sock_wfree() will call __sk_free(sk) later
1468 */
1469 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1470 __sk_free(sk);
1471}
1472EXPORT_SYMBOL(sk_free);
1473
1474/**
1475 * sk_clone_lock - clone a socket, and lock its clone
1476 * @sk: the socket to clone
1477 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1478 *
1479 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1480 */
1481struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1482{
1483 struct sock *newsk;
1484 bool is_charged = true;
1485
1486 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1487 if (newsk != NULL) {
1488 struct sk_filter *filter;
1489
1490 sock_copy(newsk, sk);
1491
1492 /* SANITY */
1493 if (likely(newsk->sk_net_refcnt))
1494 get_net(sock_net(newsk));
1495 sk_node_init(&newsk->sk_node);
1496 sock_lock_init(newsk);
1497 bh_lock_sock(newsk);
1498 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1499 newsk->sk_backlog.len = 0;
1500
1501 atomic_set(&newsk->sk_rmem_alloc, 0);
1502 /*
1503 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1504 */
1505 atomic_set(&newsk->sk_wmem_alloc, 1);
1506 atomic_set(&newsk->sk_omem_alloc, 0);
1507 skb_queue_head_init(&newsk->sk_receive_queue);
1508 skb_queue_head_init(&newsk->sk_write_queue);
1509
1510 rwlock_init(&newsk->sk_callback_lock);
1511 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1512 af_callback_keys + newsk->sk_family,
1513 af_family_clock_key_strings[newsk->sk_family]);
1514
1515 newsk->sk_dst_cache = NULL;
1516 newsk->sk_wmem_queued = 0;
1517 newsk->sk_forward_alloc = 0;
1518 newsk->sk_send_head = NULL;
1519 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1520
1521 sock_reset_flag(newsk, SOCK_DONE);
1522 skb_queue_head_init(&newsk->sk_error_queue);
1523
1524 filter = rcu_dereference_protected(newsk->sk_filter, 1);
1525 if (filter != NULL)
1526 /* though it's an empty new sock, the charging may fail
1527 * if sysctl_optmem_max was changed between creation of
1528 * original socket and cloning
1529 */
1530 is_charged = sk_filter_charge(newsk, filter);
1531
1532 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
1533 /* It is still raw copy of parent, so invalidate
1534 * destructor and make plain sk_free() */
1535 newsk->sk_destruct = NULL;
1536 bh_unlock_sock(newsk);
1537 sk_free(newsk);
1538 newsk = NULL;
1539 goto out;
1540 }
1541 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
1542
1543 newsk->sk_err = 0;
1544 newsk->sk_priority = 0;
1545 newsk->sk_incoming_cpu = raw_smp_processor_id();
1546 atomic64_set(&newsk->sk_cookie, 0);
1547 /*
1548 * Before updating sk_refcnt, we must commit prior changes to memory
1549 * (Documentation/RCU/rculist_nulls.txt for details)
1550 */
1551 smp_wmb();
1552 atomic_set(&newsk->sk_refcnt, 2);
1553
1554 /*
1555 * Increment the counter in the same struct proto as the master
1556 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1557 * is the same as sk->sk_prot->socks, as this field was copied
1558 * with memcpy).
1559 *
1560 * This _changes_ the previous behaviour, where
1561 * tcp_create_openreq_child always was incrementing the
1562 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1563 * to be taken into account in all callers. -acme
1564 */
1565 sk_refcnt_debug_inc(newsk);
1566 sk_set_socket(newsk, NULL);
1567 newsk->sk_wq = NULL;
1568
1569 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
1570 sock_update_memcg(newsk);
1571
1572 if (newsk->sk_prot->sockets_allocated)
1573 sk_sockets_allocated_inc(newsk);
1574
1575 if (sock_needs_netstamp(sk) &&
1576 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1577 net_enable_timestamp();
1578 }
1579out:
1580 return newsk;
1581}
1582EXPORT_SYMBOL_GPL(sk_clone_lock);
1583
1584void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1585{
1586 u32 max_segs = 1;
1587
1588 sk_dst_set(sk, dst);
1589 sk->sk_route_caps = dst->dev->features;
1590 if (sk->sk_route_caps & NETIF_F_GSO)
1591 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1592 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1593 if (sk_can_gso(sk)) {
1594 if (dst->header_len) {
1595 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1596 } else {
1597 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1598 sk->sk_gso_max_size = dst->dev->gso_max_size;
1599 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
1600 }
1601 }
1602 sk->sk_gso_max_segs = max_segs;
1603}
1604EXPORT_SYMBOL_GPL(sk_setup_caps);
1605
1606/*
1607 * Simple resource managers for sockets.
1608 */
1609
1610
1611/*
1612 * Write buffer destructor automatically called from kfree_skb.
1613 */
1614void sock_wfree(struct sk_buff *skb)
1615{
1616 struct sock *sk = skb->sk;
1617 unsigned int len = skb->truesize;
1618
1619 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1620 /*
1621 * Keep a reference on sk_wmem_alloc, this will be released
1622 * after sk_write_space() call
1623 */
1624 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1625 sk->sk_write_space(sk);
1626 len = 1;
1627 }
1628 /*
1629 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1630 * could not do because of in-flight packets
1631 */
1632 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
1633 __sk_free(sk);
1634}
1635EXPORT_SYMBOL(sock_wfree);
1636
1637void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1638{
1639 skb_orphan(skb);
1640 skb->sk = sk;
1641#ifdef CONFIG_INET
1642 if (unlikely(!sk_fullsock(sk))) {
1643 skb->destructor = sock_edemux;
1644 sock_hold(sk);
1645 return;
1646 }
1647#endif
1648 skb->destructor = sock_wfree;
1649 skb_set_hash_from_sk(skb, sk);
1650 /*
1651 * We used to take a refcount on sk, but following operation
1652 * is enough to guarantee sk_free() wont free this sock until
1653 * all in-flight packets are completed
1654 */
1655 atomic_add(skb->truesize, &sk->sk_wmem_alloc);
1656}
1657EXPORT_SYMBOL(skb_set_owner_w);
1658
1659void skb_orphan_partial(struct sk_buff *skb)
1660{
1661 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1662 * so we do not completely orphan skb, but transfert all
1663 * accounted bytes but one, to avoid unexpected reorders.
1664 */
1665 if (skb->destructor == sock_wfree
1666#ifdef CONFIG_INET
1667 || skb->destructor == tcp_wfree
1668#endif
1669 ) {
1670 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1671 skb->truesize = 1;
1672 } else {
1673 skb_orphan(skb);
1674 }
1675}
1676EXPORT_SYMBOL(skb_orphan_partial);
1677
1678/*
1679 * Read buffer destructor automatically called from kfree_skb.
1680 */
1681void sock_rfree(struct sk_buff *skb)
1682{
1683 struct sock *sk = skb->sk;
1684 unsigned int len = skb->truesize;
1685
1686 atomic_sub(len, &sk->sk_rmem_alloc);
1687 sk_mem_uncharge(sk, len);
1688}
1689EXPORT_SYMBOL(sock_rfree);
1690
1691/*
1692 * Buffer destructor for skbs that are not used directly in read or write
1693 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1694 */
1695void sock_efree(struct sk_buff *skb)
1696{
1697 sock_put(skb->sk);
1698}
1699EXPORT_SYMBOL(sock_efree);
1700
1701kuid_t sock_i_uid(struct sock *sk)
1702{
1703 kuid_t uid;
1704
1705 read_lock_bh(&sk->sk_callback_lock);
1706 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
1707 read_unlock_bh(&sk->sk_callback_lock);
1708 return uid;
1709}
1710EXPORT_SYMBOL(sock_i_uid);
1711
1712unsigned long sock_i_ino(struct sock *sk)
1713{
1714 unsigned long ino;
1715
1716 read_lock_bh(&sk->sk_callback_lock);
1717 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1718 read_unlock_bh(&sk->sk_callback_lock);
1719 return ino;
1720}
1721EXPORT_SYMBOL(sock_i_ino);
1722
1723/*
1724 * Allocate a skb from the socket's send buffer.
1725 */
1726struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1727 gfp_t priority)
1728{
1729 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1730 struct sk_buff *skb = alloc_skb(size, priority);
1731 if (skb) {
1732 skb_set_owner_w(skb, sk);
1733 return skb;
1734 }
1735 }
1736 return NULL;
1737}
1738EXPORT_SYMBOL(sock_wmalloc);
1739
1740/*
1741 * Allocate a memory block from the socket's option memory buffer.
1742 */
1743void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1744{
1745 if ((unsigned int)size <= sysctl_optmem_max &&
1746 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1747 void *mem;
1748 /* First do the add, to avoid the race if kmalloc
1749 * might sleep.
1750 */
1751 atomic_add(size, &sk->sk_omem_alloc);
1752 mem = kmalloc(size, priority);
1753 if (mem)
1754 return mem;
1755 atomic_sub(size, &sk->sk_omem_alloc);
1756 }
1757 return NULL;
1758}
1759EXPORT_SYMBOL(sock_kmalloc);
1760
1761/* Free an option memory block. Note, we actually want the inline
1762 * here as this allows gcc to detect the nullify and fold away the
1763 * condition entirely.
1764 */
1765static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1766 const bool nullify)
1767{
1768 if (WARN_ON_ONCE(!mem))
1769 return;
1770 if (nullify)
1771 kzfree(mem);
1772 else
1773 kfree(mem);
1774 atomic_sub(size, &sk->sk_omem_alloc);
1775}
1776
1777void sock_kfree_s(struct sock *sk, void *mem, int size)
1778{
1779 __sock_kfree_s(sk, mem, size, false);
1780}
1781EXPORT_SYMBOL(sock_kfree_s);
1782
1783void sock_kzfree_s(struct sock *sk, void *mem, int size)
1784{
1785 __sock_kfree_s(sk, mem, size, true);
1786}
1787EXPORT_SYMBOL(sock_kzfree_s);
1788
1789/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1790 I think, these locks should be removed for datagram sockets.
1791 */
1792static long sock_wait_for_wmem(struct sock *sk, long timeo)
1793{
1794 DEFINE_WAIT(wait);
1795
1796 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1797 for (;;) {
1798 if (!timeo)
1799 break;
1800 if (signal_pending(current))
1801 break;
1802 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1803 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1804 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1805 break;
1806 if (sk->sk_shutdown & SEND_SHUTDOWN)
1807 break;
1808 if (sk->sk_err)
1809 break;
1810 timeo = schedule_timeout(timeo);
1811 }
1812 finish_wait(sk_sleep(sk), &wait);
1813 return timeo;
1814}
1815
1816
1817/*
1818 * Generic send/receive buffer handlers
1819 */
1820
1821struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1822 unsigned long data_len, int noblock,
1823 int *errcode, int max_page_order)
1824{
1825 struct sk_buff *skb;
1826 long timeo;
1827 int err;
1828
1829 timeo = sock_sndtimeo(sk, noblock);
1830 for (;;) {
1831 err = sock_error(sk);
1832 if (err != 0)
1833 goto failure;
1834
1835 err = -EPIPE;
1836 if (sk->sk_shutdown & SEND_SHUTDOWN)
1837 goto failure;
1838
1839 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
1840 break;
1841
1842 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1843 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1844 err = -EAGAIN;
1845 if (!timeo)
1846 goto failure;
1847 if (signal_pending(current))
1848 goto interrupted;
1849 timeo = sock_wait_for_wmem(sk, timeo);
1850 }
1851 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
1852 errcode, sk->sk_allocation);
1853 if (skb)
1854 skb_set_owner_w(skb, sk);
1855 return skb;
1856
1857interrupted:
1858 err = sock_intr_errno(timeo);
1859failure:
1860 *errcode = err;
1861 return NULL;
1862}
1863EXPORT_SYMBOL(sock_alloc_send_pskb);
1864
1865struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1866 int noblock, int *errcode)
1867{
1868 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1869}
1870EXPORT_SYMBOL(sock_alloc_send_skb);
1871
1872int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
1873 struct sockcm_cookie *sockc)
1874{
1875 struct cmsghdr *cmsg;
1876
1877 for_each_cmsghdr(cmsg, msg) {
1878 if (!CMSG_OK(msg, cmsg))
1879 return -EINVAL;
1880 if (cmsg->cmsg_level != SOL_SOCKET)
1881 continue;
1882 switch (cmsg->cmsg_type) {
1883 case SO_MARK:
1884 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1885 return -EPERM;
1886 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
1887 return -EINVAL;
1888 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
1889 break;
1890 default:
1891 return -EINVAL;
1892 }
1893 }
1894 return 0;
1895}
1896EXPORT_SYMBOL(sock_cmsg_send);
1897
1898/* On 32bit arches, an skb frag is limited to 2^15 */
1899#define SKB_FRAG_PAGE_ORDER get_order(32768)
1900
1901/**
1902 * skb_page_frag_refill - check that a page_frag contains enough room
1903 * @sz: minimum size of the fragment we want to get
1904 * @pfrag: pointer to page_frag
1905 * @gfp: priority for memory allocation
1906 *
1907 * Note: While this allocator tries to use high order pages, there is
1908 * no guarantee that allocations succeed. Therefore, @sz MUST be
1909 * less or equal than PAGE_SIZE.
1910 */
1911bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
1912{
1913 if (pfrag->page) {
1914 if (page_ref_count(pfrag->page) == 1) {
1915 pfrag->offset = 0;
1916 return true;
1917 }
1918 if (pfrag->offset + sz <= pfrag->size)
1919 return true;
1920 put_page(pfrag->page);
1921 }
1922
1923 pfrag->offset = 0;
1924 if (SKB_FRAG_PAGE_ORDER) {
1925 /* Avoid direct reclaim but allow kswapd to wake */
1926 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
1927 __GFP_COMP | __GFP_NOWARN |
1928 __GFP_NORETRY,
1929 SKB_FRAG_PAGE_ORDER);
1930 if (likely(pfrag->page)) {
1931 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
1932 return true;
1933 }
1934 }
1935 pfrag->page = alloc_page(gfp);
1936 if (likely(pfrag->page)) {
1937 pfrag->size = PAGE_SIZE;
1938 return true;
1939 }
1940 return false;
1941}
1942EXPORT_SYMBOL(skb_page_frag_refill);
1943
1944bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1945{
1946 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1947 return true;
1948
1949 sk_enter_memory_pressure(sk);
1950 sk_stream_moderate_sndbuf(sk);
1951 return false;
1952}
1953EXPORT_SYMBOL(sk_page_frag_refill);
1954
1955static void __lock_sock(struct sock *sk)
1956 __releases(&sk->sk_lock.slock)
1957 __acquires(&sk->sk_lock.slock)
1958{
1959 DEFINE_WAIT(wait);
1960
1961 for (;;) {
1962 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1963 TASK_UNINTERRUPTIBLE);
1964 spin_unlock_bh(&sk->sk_lock.slock);
1965 schedule();
1966 spin_lock_bh(&sk->sk_lock.slock);
1967 if (!sock_owned_by_user(sk))
1968 break;
1969 }
1970 finish_wait(&sk->sk_lock.wq, &wait);
1971}
1972
1973static void __release_sock(struct sock *sk)
1974 __releases(&sk->sk_lock.slock)
1975 __acquires(&sk->sk_lock.slock)
1976{
1977 struct sk_buff *skb = sk->sk_backlog.head;
1978
1979 do {
1980 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1981 bh_unlock_sock(sk);
1982
1983 do {
1984 struct sk_buff *next = skb->next;
1985
1986 prefetch(next);
1987 WARN_ON_ONCE(skb_dst_is_noref(skb));
1988 skb->next = NULL;
1989 sk_backlog_rcv(sk, skb);
1990
1991 /*
1992 * We are in process context here with softirqs
1993 * disabled, use cond_resched_softirq() to preempt.
1994 * This is safe to do because we've taken the backlog
1995 * queue private:
1996 */
1997 cond_resched_softirq();
1998
1999 skb = next;
2000 } while (skb != NULL);
2001
2002 bh_lock_sock(sk);
2003 } while ((skb = sk->sk_backlog.head) != NULL);
2004
2005 /*
2006 * Doing the zeroing here guarantee we can not loop forever
2007 * while a wild producer attempts to flood us.
2008 */
2009 sk->sk_backlog.len = 0;
2010}
2011
2012/**
2013 * sk_wait_data - wait for data to arrive at sk_receive_queue
2014 * @sk: sock to wait on
2015 * @timeo: for how long
2016 * @skb: last skb seen on sk_receive_queue
2017 *
2018 * Now socket state including sk->sk_err is changed only under lock,
2019 * hence we may omit checks after joining wait queue.
2020 * We check receive queue before schedule() only as optimization;
2021 * it is very likely that release_sock() added new data.
2022 */
2023int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
2024{
2025 int rc;
2026 DEFINE_WAIT(wait);
2027
2028 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2029 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2030 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb);
2031 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2032 finish_wait(sk_sleep(sk), &wait);
2033 return rc;
2034}
2035EXPORT_SYMBOL(sk_wait_data);
2036
2037/**
2038 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2039 * @sk: socket
2040 * @size: memory size to allocate
2041 * @kind: allocation type
2042 *
2043 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2044 * rmem allocation. This function assumes that protocols which have
2045 * memory_pressure use sk_wmem_queued as write buffer accounting.
2046 */
2047int __sk_mem_schedule(struct sock *sk, int size, int kind)
2048{
2049 struct proto *prot = sk->sk_prot;
2050 int amt = sk_mem_pages(size);
2051 long allocated;
2052
2053 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
2054
2055 allocated = sk_memory_allocated_add(sk, amt);
2056
2057 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2058 !mem_cgroup_charge_skmem(sk->sk_memcg, amt))
2059 goto suppress_allocation;
2060
2061 /* Under limit. */
2062 if (allocated <= sk_prot_mem_limits(sk, 0)) {
2063 sk_leave_memory_pressure(sk);
2064 return 1;
2065 }
2066
2067 /* Under pressure. */
2068 if (allocated > sk_prot_mem_limits(sk, 1))
2069 sk_enter_memory_pressure(sk);
2070
2071 /* Over hard limit. */
2072 if (allocated > sk_prot_mem_limits(sk, 2))
2073 goto suppress_allocation;
2074
2075 /* guarantee minimum buffer size under pressure */
2076 if (kind == SK_MEM_RECV) {
2077 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2078 return 1;
2079
2080 } else { /* SK_MEM_SEND */
2081 if (sk->sk_type == SOCK_STREAM) {
2082 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2083 return 1;
2084 } else if (atomic_read(&sk->sk_wmem_alloc) <
2085 prot->sysctl_wmem[0])
2086 return 1;
2087 }
2088
2089 if (sk_has_memory_pressure(sk)) {
2090 int alloc;
2091
2092 if (!sk_under_memory_pressure(sk))
2093 return 1;
2094 alloc = sk_sockets_allocated_read_positive(sk);
2095 if (sk_prot_mem_limits(sk, 2) > alloc *
2096 sk_mem_pages(sk->sk_wmem_queued +
2097 atomic_read(&sk->sk_rmem_alloc) +
2098 sk->sk_forward_alloc))
2099 return 1;
2100 }
2101
2102suppress_allocation:
2103
2104 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2105 sk_stream_moderate_sndbuf(sk);
2106
2107 /* Fail only if socket is _under_ its sndbuf.
2108 * In this case we cannot block, so that we have to fail.
2109 */
2110 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2111 return 1;
2112 }
2113
2114 trace_sock_exceed_buf_limit(sk, prot, allocated);
2115
2116 /* Alas. Undo changes. */
2117 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
2118
2119 sk_memory_allocated_sub(sk, amt);
2120
2121 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2122 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
2123
2124 return 0;
2125}
2126EXPORT_SYMBOL(__sk_mem_schedule);
2127
2128/**
2129 * __sk_mem_reclaim - reclaim memory_allocated
2130 * @sk: socket
2131 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
2132 */
2133void __sk_mem_reclaim(struct sock *sk, int amount)
2134{
2135 amount >>= SK_MEM_QUANTUM_SHIFT;
2136 sk_memory_allocated_sub(sk, amount);
2137 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
2138
2139 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2140 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
2141
2142 if (sk_under_memory_pressure(sk) &&
2143 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2144 sk_leave_memory_pressure(sk);
2145}
2146EXPORT_SYMBOL(__sk_mem_reclaim);
2147
2148
2149/*
2150 * Set of default routines for initialising struct proto_ops when
2151 * the protocol does not support a particular function. In certain
2152 * cases where it makes no sense for a protocol to have a "do nothing"
2153 * function, some default processing is provided.
2154 */
2155
2156int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2157{
2158 return -EOPNOTSUPP;
2159}
2160EXPORT_SYMBOL(sock_no_bind);
2161
2162int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
2163 int len, int flags)
2164{
2165 return -EOPNOTSUPP;
2166}
2167EXPORT_SYMBOL(sock_no_connect);
2168
2169int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2170{
2171 return -EOPNOTSUPP;
2172}
2173EXPORT_SYMBOL(sock_no_socketpair);
2174
2175int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2176{
2177 return -EOPNOTSUPP;
2178}
2179EXPORT_SYMBOL(sock_no_accept);
2180
2181int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
2182 int *len, int peer)
2183{
2184 return -EOPNOTSUPP;
2185}
2186EXPORT_SYMBOL(sock_no_getname);
2187
2188unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
2189{
2190 return 0;
2191}
2192EXPORT_SYMBOL(sock_no_poll);
2193
2194int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2195{
2196 return -EOPNOTSUPP;
2197}
2198EXPORT_SYMBOL(sock_no_ioctl);
2199
2200int sock_no_listen(struct socket *sock, int backlog)
2201{
2202 return -EOPNOTSUPP;
2203}
2204EXPORT_SYMBOL(sock_no_listen);
2205
2206int sock_no_shutdown(struct socket *sock, int how)
2207{
2208 return -EOPNOTSUPP;
2209}
2210EXPORT_SYMBOL(sock_no_shutdown);
2211
2212int sock_no_setsockopt(struct socket *sock, int level, int optname,
2213 char __user *optval, unsigned int optlen)
2214{
2215 return -EOPNOTSUPP;
2216}
2217EXPORT_SYMBOL(sock_no_setsockopt);
2218
2219int sock_no_getsockopt(struct socket *sock, int level, int optname,
2220 char __user *optval, int __user *optlen)
2221{
2222 return -EOPNOTSUPP;
2223}
2224EXPORT_SYMBOL(sock_no_getsockopt);
2225
2226int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
2227{
2228 return -EOPNOTSUPP;
2229}
2230EXPORT_SYMBOL(sock_no_sendmsg);
2231
2232int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2233 int flags)
2234{
2235 return -EOPNOTSUPP;
2236}
2237EXPORT_SYMBOL(sock_no_recvmsg);
2238
2239int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2240{
2241 /* Mirror missing mmap method error code */
2242 return -ENODEV;
2243}
2244EXPORT_SYMBOL(sock_no_mmap);
2245
2246ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2247{
2248 ssize_t res;
2249 struct msghdr msg = {.msg_flags = flags};
2250 struct kvec iov;
2251 char *kaddr = kmap(page);
2252 iov.iov_base = kaddr + offset;
2253 iov.iov_len = size;
2254 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2255 kunmap(page);
2256 return res;
2257}
2258EXPORT_SYMBOL(sock_no_sendpage);
2259
2260/*
2261 * Default Socket Callbacks
2262 */
2263
2264static void sock_def_wakeup(struct sock *sk)
2265{
2266 struct socket_wq *wq;
2267
2268 rcu_read_lock();
2269 wq = rcu_dereference(sk->sk_wq);
2270 if (skwq_has_sleeper(wq))
2271 wake_up_interruptible_all(&wq->wait);
2272 rcu_read_unlock();
2273}
2274
2275static void sock_def_error_report(struct sock *sk)
2276{
2277 struct socket_wq *wq;
2278
2279 rcu_read_lock();
2280 wq = rcu_dereference(sk->sk_wq);
2281 if (skwq_has_sleeper(wq))
2282 wake_up_interruptible_poll(&wq->wait, POLLERR);
2283 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2284 rcu_read_unlock();
2285}
2286
2287static void sock_def_readable(struct sock *sk)
2288{
2289 struct socket_wq *wq;
2290
2291 rcu_read_lock();
2292 wq = rcu_dereference(sk->sk_wq);
2293 if (skwq_has_sleeper(wq))
2294 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
2295 POLLRDNORM | POLLRDBAND);
2296 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2297 rcu_read_unlock();
2298}
2299
2300static void sock_def_write_space(struct sock *sk)
2301{
2302 struct socket_wq *wq;
2303
2304 rcu_read_lock();
2305
2306 /* Do not wake up a writer until he can make "significant"
2307 * progress. --DaveM
2308 */
2309 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
2310 wq = rcu_dereference(sk->sk_wq);
2311 if (skwq_has_sleeper(wq))
2312 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
2313 POLLWRNORM | POLLWRBAND);
2314
2315 /* Should agree with poll, otherwise some programs break */
2316 if (sock_writeable(sk))
2317 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2318 }
2319
2320 rcu_read_unlock();
2321}
2322
2323static void sock_def_destruct(struct sock *sk)
2324{
2325}
2326
2327void sk_send_sigurg(struct sock *sk)
2328{
2329 if (sk->sk_socket && sk->sk_socket->file)
2330 if (send_sigurg(&sk->sk_socket->file->f_owner))
2331 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2332}
2333EXPORT_SYMBOL(sk_send_sigurg);
2334
2335void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2336 unsigned long expires)
2337{
2338 if (!mod_timer(timer, expires))
2339 sock_hold(sk);
2340}
2341EXPORT_SYMBOL(sk_reset_timer);
2342
2343void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2344{
2345 if (del_timer(timer))
2346 __sock_put(sk);
2347}
2348EXPORT_SYMBOL(sk_stop_timer);
2349
2350void sock_init_data(struct socket *sock, struct sock *sk)
2351{
2352 skb_queue_head_init(&sk->sk_receive_queue);
2353 skb_queue_head_init(&sk->sk_write_queue);
2354 skb_queue_head_init(&sk->sk_error_queue);
2355
2356 sk->sk_send_head = NULL;
2357
2358 init_timer(&sk->sk_timer);
2359
2360 sk->sk_allocation = GFP_KERNEL;
2361 sk->sk_rcvbuf = sysctl_rmem_default;
2362 sk->sk_sndbuf = sysctl_wmem_default;
2363 sk->sk_state = TCP_CLOSE;
2364 sk_set_socket(sk, sock);
2365
2366 sock_set_flag(sk, SOCK_ZAPPED);
2367
2368 if (sock) {
2369 sk->sk_type = sock->type;
2370 sk->sk_wq = sock->wq;
2371 sock->sk = sk;
2372 } else
2373 sk->sk_wq = NULL;
2374
2375 rwlock_init(&sk->sk_callback_lock);
2376 lockdep_set_class_and_name(&sk->sk_callback_lock,
2377 af_callback_keys + sk->sk_family,
2378 af_family_clock_key_strings[sk->sk_family]);
2379
2380 sk->sk_state_change = sock_def_wakeup;
2381 sk->sk_data_ready = sock_def_readable;
2382 sk->sk_write_space = sock_def_write_space;
2383 sk->sk_error_report = sock_def_error_report;
2384 sk->sk_destruct = sock_def_destruct;
2385
2386 sk->sk_frag.page = NULL;
2387 sk->sk_frag.offset = 0;
2388 sk->sk_peek_off = -1;
2389
2390 sk->sk_peer_pid = NULL;
2391 sk->sk_peer_cred = NULL;
2392 sk->sk_write_pending = 0;
2393 sk->sk_rcvlowat = 1;
2394 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2395 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2396
2397 sk->sk_stamp = ktime_set(-1L, 0);
2398
2399#ifdef CONFIG_NET_RX_BUSY_POLL
2400 sk->sk_napi_id = 0;
2401 sk->sk_ll_usec = sysctl_net_busy_read;
2402#endif
2403
2404 sk->sk_max_pacing_rate = ~0U;
2405 sk->sk_pacing_rate = ~0U;
2406 sk->sk_incoming_cpu = -1;
2407 /*
2408 * Before updating sk_refcnt, we must commit prior changes to memory
2409 * (Documentation/RCU/rculist_nulls.txt for details)
2410 */
2411 smp_wmb();
2412 atomic_set(&sk->sk_refcnt, 1);
2413 atomic_set(&sk->sk_drops, 0);
2414}
2415EXPORT_SYMBOL(sock_init_data);
2416
2417void lock_sock_nested(struct sock *sk, int subclass)
2418{
2419 might_sleep();
2420 spin_lock_bh(&sk->sk_lock.slock);
2421 if (sk->sk_lock.owned)
2422 __lock_sock(sk);
2423 sk->sk_lock.owned = 1;
2424 spin_unlock(&sk->sk_lock.slock);
2425 /*
2426 * The sk_lock has mutex_lock() semantics here:
2427 */
2428 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2429 local_bh_enable();
2430}
2431EXPORT_SYMBOL(lock_sock_nested);
2432
2433void release_sock(struct sock *sk)
2434{
2435 /*
2436 * The sk_lock has mutex_unlock() semantics:
2437 */
2438 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2439
2440 spin_lock_bh(&sk->sk_lock.slock);
2441 if (sk->sk_backlog.tail)
2442 __release_sock(sk);
2443
2444 /* Warning : release_cb() might need to release sk ownership,
2445 * ie call sock_release_ownership(sk) before us.
2446 */
2447 if (sk->sk_prot->release_cb)
2448 sk->sk_prot->release_cb(sk);
2449
2450 sock_release_ownership(sk);
2451 if (waitqueue_active(&sk->sk_lock.wq))
2452 wake_up(&sk->sk_lock.wq);
2453 spin_unlock_bh(&sk->sk_lock.slock);
2454}
2455EXPORT_SYMBOL(release_sock);
2456
2457/**
2458 * lock_sock_fast - fast version of lock_sock
2459 * @sk: socket
2460 *
2461 * This version should be used for very small section, where process wont block
2462 * return false if fast path is taken
2463 * sk_lock.slock locked, owned = 0, BH disabled
2464 * return true if slow path is taken
2465 * sk_lock.slock unlocked, owned = 1, BH enabled
2466 */
2467bool lock_sock_fast(struct sock *sk)
2468{
2469 might_sleep();
2470 spin_lock_bh(&sk->sk_lock.slock);
2471
2472 if (!sk->sk_lock.owned)
2473 /*
2474 * Note : We must disable BH
2475 */
2476 return false;
2477
2478 __lock_sock(sk);
2479 sk->sk_lock.owned = 1;
2480 spin_unlock(&sk->sk_lock.slock);
2481 /*
2482 * The sk_lock has mutex_lock() semantics here:
2483 */
2484 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2485 local_bh_enable();
2486 return true;
2487}
2488EXPORT_SYMBOL(lock_sock_fast);
2489
2490int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2491{
2492 struct timeval tv;
2493 if (!sock_flag(sk, SOCK_TIMESTAMP))
2494 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2495 tv = ktime_to_timeval(sk->sk_stamp);
2496 if (tv.tv_sec == -1)
2497 return -ENOENT;
2498 if (tv.tv_sec == 0) {
2499 sk->sk_stamp = ktime_get_real();
2500 tv = ktime_to_timeval(sk->sk_stamp);
2501 }
2502 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
2503}
2504EXPORT_SYMBOL(sock_get_timestamp);
2505
2506int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2507{
2508 struct timespec ts;
2509 if (!sock_flag(sk, SOCK_TIMESTAMP))
2510 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2511 ts = ktime_to_timespec(sk->sk_stamp);
2512 if (ts.tv_sec == -1)
2513 return -ENOENT;
2514 if (ts.tv_sec == 0) {
2515 sk->sk_stamp = ktime_get_real();
2516 ts = ktime_to_timespec(sk->sk_stamp);
2517 }
2518 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2519}
2520EXPORT_SYMBOL(sock_get_timestampns);
2521
2522void sock_enable_timestamp(struct sock *sk, int flag)
2523{
2524 if (!sock_flag(sk, flag)) {
2525 unsigned long previous_flags = sk->sk_flags;
2526
2527 sock_set_flag(sk, flag);
2528 /*
2529 * we just set one of the two flags which require net
2530 * time stamping, but time stamping might have been on
2531 * already because of the other one
2532 */
2533 if (sock_needs_netstamp(sk) &&
2534 !(previous_flags & SK_FLAGS_TIMESTAMP))
2535 net_enable_timestamp();
2536 }
2537}
2538
2539int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2540 int level, int type)
2541{
2542 struct sock_exterr_skb *serr;
2543 struct sk_buff *skb;
2544 int copied, err;
2545
2546 err = -EAGAIN;
2547 skb = sock_dequeue_err_skb(sk);
2548 if (skb == NULL)
2549 goto out;
2550
2551 copied = skb->len;
2552 if (copied > len) {
2553 msg->msg_flags |= MSG_TRUNC;
2554 copied = len;
2555 }
2556 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2557 if (err)
2558 goto out_free_skb;
2559
2560 sock_recv_timestamp(msg, sk, skb);
2561
2562 serr = SKB_EXT_ERR(skb);
2563 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2564
2565 msg->msg_flags |= MSG_ERRQUEUE;
2566 err = copied;
2567
2568out_free_skb:
2569 kfree_skb(skb);
2570out:
2571 return err;
2572}
2573EXPORT_SYMBOL(sock_recv_errqueue);
2574
2575/*
2576 * Get a socket option on an socket.
2577 *
2578 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2579 * asynchronous errors should be reported by getsockopt. We assume
2580 * this means if you specify SO_ERROR (otherwise whats the point of it).
2581 */
2582int sock_common_getsockopt(struct socket *sock, int level, int optname,
2583 char __user *optval, int __user *optlen)
2584{
2585 struct sock *sk = sock->sk;
2586
2587 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2588}
2589EXPORT_SYMBOL(sock_common_getsockopt);
2590
2591#ifdef CONFIG_COMPAT
2592int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2593 char __user *optval, int __user *optlen)
2594{
2595 struct sock *sk = sock->sk;
2596
2597 if (sk->sk_prot->compat_getsockopt != NULL)
2598 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2599 optval, optlen);
2600 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2601}
2602EXPORT_SYMBOL(compat_sock_common_getsockopt);
2603#endif
2604
2605int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2606 int flags)
2607{
2608 struct sock *sk = sock->sk;
2609 int addr_len = 0;
2610 int err;
2611
2612 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
2613 flags & ~MSG_DONTWAIT, &addr_len);
2614 if (err >= 0)
2615 msg->msg_namelen = addr_len;
2616 return err;
2617}
2618EXPORT_SYMBOL(sock_common_recvmsg);
2619
2620/*
2621 * Set socket options on an inet socket.
2622 */
2623int sock_common_setsockopt(struct socket *sock, int level, int optname,
2624 char __user *optval, unsigned int optlen)
2625{
2626 struct sock *sk = sock->sk;
2627
2628 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2629}
2630EXPORT_SYMBOL(sock_common_setsockopt);
2631
2632#ifdef CONFIG_COMPAT
2633int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2634 char __user *optval, unsigned int optlen)
2635{
2636 struct sock *sk = sock->sk;
2637
2638 if (sk->sk_prot->compat_setsockopt != NULL)
2639 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2640 optval, optlen);
2641 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2642}
2643EXPORT_SYMBOL(compat_sock_common_setsockopt);
2644#endif
2645
2646void sk_common_release(struct sock *sk)
2647{
2648 if (sk->sk_prot->destroy)
2649 sk->sk_prot->destroy(sk);
2650
2651 /*
2652 * Observation: when sock_common_release is called, processes have
2653 * no access to socket. But net still has.
2654 * Step one, detach it from networking:
2655 *
2656 * A. Remove from hash tables.
2657 */
2658
2659 sk->sk_prot->unhash(sk);
2660
2661 /*
2662 * In this point socket cannot receive new packets, but it is possible
2663 * that some packets are in flight because some CPU runs receiver and
2664 * did hash table lookup before we unhashed socket. They will achieve
2665 * receive queue and will be purged by socket destructor.
2666 *
2667 * Also we still have packets pending on receive queue and probably,
2668 * our own packets waiting in device queues. sock_destroy will drain
2669 * receive queue, but transmitted packets will delay socket destruction
2670 * until the last reference will be released.
2671 */
2672
2673 sock_orphan(sk);
2674
2675 xfrm_sk_free_policy(sk);
2676
2677 sk_refcnt_debug_release(sk);
2678
2679 if (sk->sk_frag.page) {
2680 put_page(sk->sk_frag.page);
2681 sk->sk_frag.page = NULL;
2682 }
2683
2684 sock_put(sk);
2685}
2686EXPORT_SYMBOL(sk_common_release);
2687
2688#ifdef CONFIG_PROC_FS
2689#define PROTO_INUSE_NR 64 /* should be enough for the first time */
2690struct prot_inuse {
2691 int val[PROTO_INUSE_NR];
2692};
2693
2694static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2695
2696#ifdef CONFIG_NET_NS
2697void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2698{
2699 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
2700}
2701EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2702
2703int sock_prot_inuse_get(struct net *net, struct proto *prot)
2704{
2705 int cpu, idx = prot->inuse_idx;
2706 int res = 0;
2707
2708 for_each_possible_cpu(cpu)
2709 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2710
2711 return res >= 0 ? res : 0;
2712}
2713EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2714
2715static int __net_init sock_inuse_init_net(struct net *net)
2716{
2717 net->core.inuse = alloc_percpu(struct prot_inuse);
2718 return net->core.inuse ? 0 : -ENOMEM;
2719}
2720
2721static void __net_exit sock_inuse_exit_net(struct net *net)
2722{
2723 free_percpu(net->core.inuse);
2724}
2725
2726static struct pernet_operations net_inuse_ops = {
2727 .init = sock_inuse_init_net,
2728 .exit = sock_inuse_exit_net,
2729};
2730
2731static __init int net_inuse_init(void)
2732{
2733 if (register_pernet_subsys(&net_inuse_ops))
2734 panic("Cannot initialize net inuse counters");
2735
2736 return 0;
2737}
2738
2739core_initcall(net_inuse_init);
2740#else
2741static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2742
2743void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2744{
2745 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
2746}
2747EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2748
2749int sock_prot_inuse_get(struct net *net, struct proto *prot)
2750{
2751 int cpu, idx = prot->inuse_idx;
2752 int res = 0;
2753
2754 for_each_possible_cpu(cpu)
2755 res += per_cpu(prot_inuse, cpu).val[idx];
2756
2757 return res >= 0 ? res : 0;
2758}
2759EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2760#endif
2761
2762static void assign_proto_idx(struct proto *prot)
2763{
2764 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2765
2766 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2767 pr_err("PROTO_INUSE_NR exhausted\n");
2768 return;
2769 }
2770
2771 set_bit(prot->inuse_idx, proto_inuse_idx);
2772}
2773
2774static void release_proto_idx(struct proto *prot)
2775{
2776 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2777 clear_bit(prot->inuse_idx, proto_inuse_idx);
2778}
2779#else
2780static inline void assign_proto_idx(struct proto *prot)
2781{
2782}
2783
2784static inline void release_proto_idx(struct proto *prot)
2785{
2786}
2787#endif
2788
2789static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
2790{
2791 if (!rsk_prot)
2792 return;
2793 kfree(rsk_prot->slab_name);
2794 rsk_prot->slab_name = NULL;
2795 kmem_cache_destroy(rsk_prot->slab);
2796 rsk_prot->slab = NULL;
2797}
2798
2799static int req_prot_init(const struct proto *prot)
2800{
2801 struct request_sock_ops *rsk_prot = prot->rsk_prot;
2802
2803 if (!rsk_prot)
2804 return 0;
2805
2806 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
2807 prot->name);
2808 if (!rsk_prot->slab_name)
2809 return -ENOMEM;
2810
2811 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
2812 rsk_prot->obj_size, 0,
2813 prot->slab_flags, NULL);
2814
2815 if (!rsk_prot->slab) {
2816 pr_crit("%s: Can't create request sock SLAB cache!\n",
2817 prot->name);
2818 return -ENOMEM;
2819 }
2820 return 0;
2821}
2822
2823int proto_register(struct proto *prot, int alloc_slab)
2824{
2825 if (alloc_slab) {
2826 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2827 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2828 NULL);
2829
2830 if (prot->slab == NULL) {
2831 pr_crit("%s: Can't create sock SLAB cache!\n",
2832 prot->name);
2833 goto out;
2834 }
2835
2836 if (req_prot_init(prot))
2837 goto out_free_request_sock_slab;
2838
2839 if (prot->twsk_prot != NULL) {
2840 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
2841
2842 if (prot->twsk_prot->twsk_slab_name == NULL)
2843 goto out_free_request_sock_slab;
2844
2845 prot->twsk_prot->twsk_slab =
2846 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2847 prot->twsk_prot->twsk_obj_size,
2848 0,
2849 prot->slab_flags,
2850 NULL);
2851 if (prot->twsk_prot->twsk_slab == NULL)
2852 goto out_free_timewait_sock_slab_name;
2853 }
2854 }
2855
2856 mutex_lock(&proto_list_mutex);
2857 list_add(&prot->node, &proto_list);
2858 assign_proto_idx(prot);
2859 mutex_unlock(&proto_list_mutex);
2860 return 0;
2861
2862out_free_timewait_sock_slab_name:
2863 kfree(prot->twsk_prot->twsk_slab_name);
2864out_free_request_sock_slab:
2865 req_prot_cleanup(prot->rsk_prot);
2866
2867 kmem_cache_destroy(prot->slab);
2868 prot->slab = NULL;
2869out:
2870 return -ENOBUFS;
2871}
2872EXPORT_SYMBOL(proto_register);
2873
2874void proto_unregister(struct proto *prot)
2875{
2876 mutex_lock(&proto_list_mutex);
2877 release_proto_idx(prot);
2878 list_del(&prot->node);
2879 mutex_unlock(&proto_list_mutex);
2880
2881 kmem_cache_destroy(prot->slab);
2882 prot->slab = NULL;
2883
2884 req_prot_cleanup(prot->rsk_prot);
2885
2886 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2887 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2888 kfree(prot->twsk_prot->twsk_slab_name);
2889 prot->twsk_prot->twsk_slab = NULL;
2890 }
2891}
2892EXPORT_SYMBOL(proto_unregister);
2893
2894#ifdef CONFIG_PROC_FS
2895static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2896 __acquires(proto_list_mutex)
2897{
2898 mutex_lock(&proto_list_mutex);
2899 return seq_list_start_head(&proto_list, *pos);
2900}
2901
2902static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2903{
2904 return seq_list_next(v, &proto_list, pos);
2905}
2906
2907static void proto_seq_stop(struct seq_file *seq, void *v)
2908 __releases(proto_list_mutex)
2909{
2910 mutex_unlock(&proto_list_mutex);
2911}
2912
2913static char proto_method_implemented(const void *method)
2914{
2915 return method == NULL ? 'n' : 'y';
2916}
2917static long sock_prot_memory_allocated(struct proto *proto)
2918{
2919 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
2920}
2921
2922static char *sock_prot_memory_pressure(struct proto *proto)
2923{
2924 return proto->memory_pressure != NULL ?
2925 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2926}
2927
2928static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2929{
2930
2931 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
2932 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2933 proto->name,
2934 proto->obj_size,
2935 sock_prot_inuse_get(seq_file_net(seq), proto),
2936 sock_prot_memory_allocated(proto),
2937 sock_prot_memory_pressure(proto),
2938 proto->max_header,
2939 proto->slab == NULL ? "no" : "yes",
2940 module_name(proto->owner),
2941 proto_method_implemented(proto->close),
2942 proto_method_implemented(proto->connect),
2943 proto_method_implemented(proto->disconnect),
2944 proto_method_implemented(proto->accept),
2945 proto_method_implemented(proto->ioctl),
2946 proto_method_implemented(proto->init),
2947 proto_method_implemented(proto->destroy),
2948 proto_method_implemented(proto->shutdown),
2949 proto_method_implemented(proto->setsockopt),
2950 proto_method_implemented(proto->getsockopt),
2951 proto_method_implemented(proto->sendmsg),
2952 proto_method_implemented(proto->recvmsg),
2953 proto_method_implemented(proto->sendpage),
2954 proto_method_implemented(proto->bind),
2955 proto_method_implemented(proto->backlog_rcv),
2956 proto_method_implemented(proto->hash),
2957 proto_method_implemented(proto->unhash),
2958 proto_method_implemented(proto->get_port),
2959 proto_method_implemented(proto->enter_memory_pressure));
2960}
2961
2962static int proto_seq_show(struct seq_file *seq, void *v)
2963{
2964 if (v == &proto_list)
2965 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2966 "protocol",
2967 "size",
2968 "sockets",
2969 "memory",
2970 "press",
2971 "maxhdr",
2972 "slab",
2973 "module",
2974 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2975 else
2976 proto_seq_printf(seq, list_entry(v, struct proto, node));
2977 return 0;
2978}
2979
2980static const struct seq_operations proto_seq_ops = {
2981 .start = proto_seq_start,
2982 .next = proto_seq_next,
2983 .stop = proto_seq_stop,
2984 .show = proto_seq_show,
2985};
2986
2987static int proto_seq_open(struct inode *inode, struct file *file)
2988{
2989 return seq_open_net(inode, file, &proto_seq_ops,
2990 sizeof(struct seq_net_private));
2991}
2992
2993static const struct file_operations proto_seq_fops = {
2994 .owner = THIS_MODULE,
2995 .open = proto_seq_open,
2996 .read = seq_read,
2997 .llseek = seq_lseek,
2998 .release = seq_release_net,
2999};
3000
3001static __net_init int proto_init_net(struct net *net)
3002{
3003 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
3004 return -ENOMEM;
3005
3006 return 0;
3007}
3008
3009static __net_exit void proto_exit_net(struct net *net)
3010{
3011 remove_proc_entry("protocols", net->proc_net);
3012}
3013
3014
3015static __net_initdata struct pernet_operations proto_net_ops = {
3016 .init = proto_init_net,
3017 .exit = proto_exit_net,
3018};
3019
3020static int __init proto_init(void)
3021{
3022 return register_pernet_subsys(&proto_net_ops);
3023}
3024
3025subsys_initcall(proto_init);
3026
3027#endif /* PROC_FS */