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92#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
93
94#include <linux/capability.h>
95#include <linux/errno.h>
96#include <linux/errqueue.h>
97#include <linux/types.h>
98#include <linux/socket.h>
99#include <linux/in.h>
100#include <linux/kernel.h>
101#include <linux/module.h>
102#include <linux/proc_fs.h>
103#include <linux/seq_file.h>
104#include <linux/sched.h>
105#include <linux/sched/mm.h>
106#include <linux/timer.h>
107#include <linux/string.h>
108#include <linux/sockios.h>
109#include <linux/net.h>
110#include <linux/mm.h>
111#include <linux/slab.h>
112#include <linux/interrupt.h>
113#include <linux/poll.h>
114#include <linux/tcp.h>
115#include <linux/init.h>
116#include <linux/highmem.h>
117#include <linux/user_namespace.h>
118#include <linux/static_key.h>
119#include <linux/memcontrol.h>
120#include <linux/prefetch.h>
121
122#include <linux/uaccess.h>
123
124#include <linux/netdevice.h>
125#include <net/protocol.h>
126#include <linux/skbuff.h>
127#include <net/net_namespace.h>
128#include <net/request_sock.h>
129#include <net/sock.h>
130#include <linux/net_tstamp.h>
131#include <net/xfrm.h>
132#include <linux/ipsec.h>
133#include <net/cls_cgroup.h>
134#include <net/netprio_cgroup.h>
135#include <linux/sock_diag.h>
136
137#include <linux/filter.h>
138#include <net/sock_reuseport.h>
139
140#include <trace/events/sock.h>
141
142#include <net/tcp.h>
143#include <net/busy_poll.h>
144
145static DEFINE_MUTEX(proto_list_mutex);
146static LIST_HEAD(proto_list);
147
148
149
150
151
152
153
154
155
156
157
158bool sk_ns_capable(const struct sock *sk,
159 struct user_namespace *user_ns, int cap)
160{
161 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
162 ns_capable(user_ns, cap);
163}
164EXPORT_SYMBOL(sk_ns_capable);
165
166
167
168
169
170
171
172
173
174
175bool sk_capable(const struct sock *sk, int cap)
176{
177 return sk_ns_capable(sk, &init_user_ns, cap);
178}
179EXPORT_SYMBOL(sk_capable);
180
181
182
183
184
185
186
187
188
189
190bool sk_net_capable(const struct sock *sk, int cap)
191{
192 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
193}
194EXPORT_SYMBOL(sk_net_capable);
195
196
197
198
199
200
201static struct lock_class_key af_family_keys[AF_MAX];
202static struct lock_class_key af_family_kern_keys[AF_MAX];
203static struct lock_class_key af_family_slock_keys[AF_MAX];
204static struct lock_class_key af_family_kern_slock_keys[AF_MAX];
205
206
207
208
209
210
211
212#define _sock_locks(x) \
213 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \
214 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \
215 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \
216 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \
217 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \
218 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \
219 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \
220 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \
221 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \
222 x "27" , x "28" , x "AF_CAN" , \
223 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \
224 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \
225 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \
226 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \
227 x "AF_QIPCRTR", x "AF_SMC" , x "AF_MAX"
228
229static const char *const af_family_key_strings[AF_MAX+1] = {
230 _sock_locks("sk_lock-")
231};
232static const char *const af_family_slock_key_strings[AF_MAX+1] = {
233 _sock_locks("slock-")
234};
235static const char *const af_family_clock_key_strings[AF_MAX+1] = {
236 _sock_locks("clock-")
237};
238
239static const char *const af_family_kern_key_strings[AF_MAX+1] = {
240 _sock_locks("k-sk_lock-")
241};
242static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = {
243 _sock_locks("k-slock-")
244};
245static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = {
246 _sock_locks("k-clock-")
247};
248static const char *const af_family_rlock_key_strings[AF_MAX+1] = {
249 "rlock-AF_UNSPEC", "rlock-AF_UNIX" , "rlock-AF_INET" ,
250 "rlock-AF_AX25" , "rlock-AF_IPX" , "rlock-AF_APPLETALK",
251 "rlock-AF_NETROM", "rlock-AF_BRIDGE" , "rlock-AF_ATMPVC" ,
252 "rlock-AF_X25" , "rlock-AF_INET6" , "rlock-AF_ROSE" ,
253 "rlock-AF_DECnet", "rlock-AF_NETBEUI" , "rlock-AF_SECURITY" ,
254 "rlock-AF_KEY" , "rlock-AF_NETLINK" , "rlock-AF_PACKET" ,
255 "rlock-AF_ASH" , "rlock-AF_ECONET" , "rlock-AF_ATMSVC" ,
256 "rlock-AF_RDS" , "rlock-AF_SNA" , "rlock-AF_IRDA" ,
257 "rlock-AF_PPPOX" , "rlock-AF_WANPIPE" , "rlock-AF_LLC" ,
258 "rlock-27" , "rlock-28" , "rlock-AF_CAN" ,
259 "rlock-AF_TIPC" , "rlock-AF_BLUETOOTH", "rlock-AF_IUCV" ,
260 "rlock-AF_RXRPC" , "rlock-AF_ISDN" , "rlock-AF_PHONET" ,
261 "rlock-AF_IEEE802154", "rlock-AF_CAIF" , "rlock-AF_ALG" ,
262 "rlock-AF_NFC" , "rlock-AF_VSOCK" , "rlock-AF_KCM" ,
263 "rlock-AF_QIPCRTR", "rlock-AF_SMC" , "rlock-AF_MAX"
264};
265static const char *const af_family_wlock_key_strings[AF_MAX+1] = {
266 "wlock-AF_UNSPEC", "wlock-AF_UNIX" , "wlock-AF_INET" ,
267 "wlock-AF_AX25" , "wlock-AF_IPX" , "wlock-AF_APPLETALK",
268 "wlock-AF_NETROM", "wlock-AF_BRIDGE" , "wlock-AF_ATMPVC" ,
269 "wlock-AF_X25" , "wlock-AF_INET6" , "wlock-AF_ROSE" ,
270 "wlock-AF_DECnet", "wlock-AF_NETBEUI" , "wlock-AF_SECURITY" ,
271 "wlock-AF_KEY" , "wlock-AF_NETLINK" , "wlock-AF_PACKET" ,
272 "wlock-AF_ASH" , "wlock-AF_ECONET" , "wlock-AF_ATMSVC" ,
273 "wlock-AF_RDS" , "wlock-AF_SNA" , "wlock-AF_IRDA" ,
274 "wlock-AF_PPPOX" , "wlock-AF_WANPIPE" , "wlock-AF_LLC" ,
275 "wlock-27" , "wlock-28" , "wlock-AF_CAN" ,
276 "wlock-AF_TIPC" , "wlock-AF_BLUETOOTH", "wlock-AF_IUCV" ,
277 "wlock-AF_RXRPC" , "wlock-AF_ISDN" , "wlock-AF_PHONET" ,
278 "wlock-AF_IEEE802154", "wlock-AF_CAIF" , "wlock-AF_ALG" ,
279 "wlock-AF_NFC" , "wlock-AF_VSOCK" , "wlock-AF_KCM" ,
280 "wlock-AF_QIPCRTR", "wlock-AF_SMC" , "wlock-AF_MAX"
281};
282static const char *const af_family_elock_key_strings[AF_MAX+1] = {
283 "elock-AF_UNSPEC", "elock-AF_UNIX" , "elock-AF_INET" ,
284 "elock-AF_AX25" , "elock-AF_IPX" , "elock-AF_APPLETALK",
285 "elock-AF_NETROM", "elock-AF_BRIDGE" , "elock-AF_ATMPVC" ,
286 "elock-AF_X25" , "elock-AF_INET6" , "elock-AF_ROSE" ,
287 "elock-AF_DECnet", "elock-AF_NETBEUI" , "elock-AF_SECURITY" ,
288 "elock-AF_KEY" , "elock-AF_NETLINK" , "elock-AF_PACKET" ,
289 "elock-AF_ASH" , "elock-AF_ECONET" , "elock-AF_ATMSVC" ,
290 "elock-AF_RDS" , "elock-AF_SNA" , "elock-AF_IRDA" ,
291 "elock-AF_PPPOX" , "elock-AF_WANPIPE" , "elock-AF_LLC" ,
292 "elock-27" , "elock-28" , "elock-AF_CAN" ,
293 "elock-AF_TIPC" , "elock-AF_BLUETOOTH", "elock-AF_IUCV" ,
294 "elock-AF_RXRPC" , "elock-AF_ISDN" , "elock-AF_PHONET" ,
295 "elock-AF_IEEE802154", "elock-AF_CAIF" , "elock-AF_ALG" ,
296 "elock-AF_NFC" , "elock-AF_VSOCK" , "elock-AF_KCM" ,
297 "elock-AF_QIPCRTR", "elock-AF_SMC" , "elock-AF_MAX"
298};
299
300
301
302
303
304static struct lock_class_key af_callback_keys[AF_MAX];
305static struct lock_class_key af_rlock_keys[AF_MAX];
306static struct lock_class_key af_wlock_keys[AF_MAX];
307static struct lock_class_key af_elock_keys[AF_MAX];
308static struct lock_class_key af_kern_callback_keys[AF_MAX];
309
310
311__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
312EXPORT_SYMBOL(sysctl_wmem_max);
313__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
314EXPORT_SYMBOL(sysctl_rmem_max);
315__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
316__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
317
318
319int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
320EXPORT_SYMBOL(sysctl_optmem_max);
321
322int sysctl_tstamp_allow_data __read_mostly = 1;
323
324struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
325EXPORT_SYMBOL_GPL(memalloc_socks);
326
327
328
329
330
331
332
333
334
335void sk_set_memalloc(struct sock *sk)
336{
337 sock_set_flag(sk, SOCK_MEMALLOC);
338 sk->sk_allocation |= __GFP_MEMALLOC;
339 static_key_slow_inc(&memalloc_socks);
340}
341EXPORT_SYMBOL_GPL(sk_set_memalloc);
342
343void sk_clear_memalloc(struct sock *sk)
344{
345 sock_reset_flag(sk, SOCK_MEMALLOC);
346 sk->sk_allocation &= ~__GFP_MEMALLOC;
347 static_key_slow_dec(&memalloc_socks);
348
349
350
351
352
353
354
355
356 sk_mem_reclaim(sk);
357}
358EXPORT_SYMBOL_GPL(sk_clear_memalloc);
359
360int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
361{
362 int ret;
363 unsigned int noreclaim_flag;
364
365
366 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
367
368 noreclaim_flag = memalloc_noreclaim_save();
369 ret = sk->sk_backlog_rcv(sk, skb);
370 memalloc_noreclaim_restore(noreclaim_flag);
371
372 return ret;
373}
374EXPORT_SYMBOL(__sk_backlog_rcv);
375
376static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
377{
378 struct timeval tv;
379
380 if (optlen < sizeof(tv))
381 return -EINVAL;
382 if (copy_from_user(&tv, optval, sizeof(tv)))
383 return -EFAULT;
384 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
385 return -EDOM;
386
387 if (tv.tv_sec < 0) {
388 static int warned __read_mostly;
389
390 *timeo_p = 0;
391 if (warned < 10 && net_ratelimit()) {
392 warned++;
393 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
394 __func__, current->comm, task_pid_nr(current));
395 }
396 return 0;
397 }
398 *timeo_p = MAX_SCHEDULE_TIMEOUT;
399 if (tv.tv_sec == 0 && tv.tv_usec == 0)
400 return 0;
401 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
402 *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP(tv.tv_usec, USEC_PER_SEC / HZ);
403 return 0;
404}
405
406static void sock_warn_obsolete_bsdism(const char *name)
407{
408 static int warned;
409 static char warncomm[TASK_COMM_LEN];
410 if (strcmp(warncomm, current->comm) && warned < 5) {
411 strcpy(warncomm, current->comm);
412 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
413 warncomm, name);
414 warned++;
415 }
416}
417
418static bool sock_needs_netstamp(const struct sock *sk)
419{
420 switch (sk->sk_family) {
421 case AF_UNSPEC:
422 case AF_UNIX:
423 return false;
424 default:
425 return true;
426 }
427}
428
429static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
430{
431 if (sk->sk_flags & flags) {
432 sk->sk_flags &= ~flags;
433 if (sock_needs_netstamp(sk) &&
434 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
435 net_disable_timestamp();
436 }
437}
438
439
440int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
441{
442 unsigned long flags;
443 struct sk_buff_head *list = &sk->sk_receive_queue;
444
445 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
446 atomic_inc(&sk->sk_drops);
447 trace_sock_rcvqueue_full(sk, skb);
448 return -ENOMEM;
449 }
450
451 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
452 atomic_inc(&sk->sk_drops);
453 return -ENOBUFS;
454 }
455
456 skb->dev = NULL;
457 skb_set_owner_r(skb, sk);
458
459
460
461
462 skb_dst_force(skb);
463
464 spin_lock_irqsave(&list->lock, flags);
465 sock_skb_set_dropcount(sk, skb);
466 __skb_queue_tail(list, skb);
467 spin_unlock_irqrestore(&list->lock, flags);
468
469 if (!sock_flag(sk, SOCK_DEAD))
470 sk->sk_data_ready(sk);
471 return 0;
472}
473EXPORT_SYMBOL(__sock_queue_rcv_skb);
474
475int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
476{
477 int err;
478
479 err = sk_filter(sk, skb);
480 if (err)
481 return err;
482
483 return __sock_queue_rcv_skb(sk, skb);
484}
485EXPORT_SYMBOL(sock_queue_rcv_skb);
486
487int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
488 const int nested, unsigned int trim_cap, bool refcounted)
489{
490 int rc = NET_RX_SUCCESS;
491
492 if (sk_filter_trim_cap(sk, skb, trim_cap))
493 goto discard_and_relse;
494
495 skb->dev = NULL;
496
497 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
498 atomic_inc(&sk->sk_drops);
499 goto discard_and_relse;
500 }
501 if (nested)
502 bh_lock_sock_nested(sk);
503 else
504 bh_lock_sock(sk);
505 if (!sock_owned_by_user(sk)) {
506
507
508
509 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
510
511 rc = sk_backlog_rcv(sk, skb);
512
513 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
514 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
515 bh_unlock_sock(sk);
516 atomic_inc(&sk->sk_drops);
517 goto discard_and_relse;
518 }
519
520 bh_unlock_sock(sk);
521out:
522 if (refcounted)
523 sock_put(sk);
524 return rc;
525discard_and_relse:
526 kfree_skb(skb);
527 goto out;
528}
529EXPORT_SYMBOL(__sk_receive_skb);
530
531struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
532{
533 struct dst_entry *dst = __sk_dst_get(sk);
534
535 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
536 sk_tx_queue_clear(sk);
537 sk->sk_dst_pending_confirm = 0;
538 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
539 dst_release(dst);
540 return NULL;
541 }
542
543 return dst;
544}
545EXPORT_SYMBOL(__sk_dst_check);
546
547struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
548{
549 struct dst_entry *dst = sk_dst_get(sk);
550
551 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
552 sk_dst_reset(sk);
553 dst_release(dst);
554 return NULL;
555 }
556
557 return dst;
558}
559EXPORT_SYMBOL(sk_dst_check);
560
561static int sock_setbindtodevice(struct sock *sk, char __user *optval,
562 int optlen)
563{
564 int ret = -ENOPROTOOPT;
565#ifdef CONFIG_NETDEVICES
566 struct net *net = sock_net(sk);
567 char devname[IFNAMSIZ];
568 int index;
569
570
571 ret = -EPERM;
572 if (!ns_capable(net->user_ns, CAP_NET_RAW))
573 goto out;
574
575 ret = -EINVAL;
576 if (optlen < 0)
577 goto out;
578
579
580
581
582
583
584 if (optlen > IFNAMSIZ - 1)
585 optlen = IFNAMSIZ - 1;
586 memset(devname, 0, sizeof(devname));
587
588 ret = -EFAULT;
589 if (copy_from_user(devname, optval, optlen))
590 goto out;
591
592 index = 0;
593 if (devname[0] != '\0') {
594 struct net_device *dev;
595
596 rcu_read_lock();
597 dev = dev_get_by_name_rcu(net, devname);
598 if (dev)
599 index = dev->ifindex;
600 rcu_read_unlock();
601 ret = -ENODEV;
602 if (!dev)
603 goto out;
604 }
605
606 lock_sock(sk);
607 sk->sk_bound_dev_if = index;
608 sk_dst_reset(sk);
609 release_sock(sk);
610
611 ret = 0;
612
613out:
614#endif
615
616 return ret;
617}
618
619static int sock_getbindtodevice(struct sock *sk, char __user *optval,
620 int __user *optlen, int len)
621{
622 int ret = -ENOPROTOOPT;
623#ifdef CONFIG_NETDEVICES
624 struct net *net = sock_net(sk);
625 char devname[IFNAMSIZ];
626
627 if (sk->sk_bound_dev_if == 0) {
628 len = 0;
629 goto zero;
630 }
631
632 ret = -EINVAL;
633 if (len < IFNAMSIZ)
634 goto out;
635
636 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
637 if (ret)
638 goto out;
639
640 len = strlen(devname) + 1;
641
642 ret = -EFAULT;
643 if (copy_to_user(optval, devname, len))
644 goto out;
645
646zero:
647 ret = -EFAULT;
648 if (put_user(len, optlen))
649 goto out;
650
651 ret = 0;
652
653out:
654#endif
655
656 return ret;
657}
658
659static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
660{
661 if (valbool)
662 sock_set_flag(sk, bit);
663 else
664 sock_reset_flag(sk, bit);
665}
666
667bool sk_mc_loop(struct sock *sk)
668{
669 if (dev_recursion_level())
670 return false;
671 if (!sk)
672 return true;
673 switch (sk->sk_family) {
674 case AF_INET:
675 return inet_sk(sk)->mc_loop;
676#if IS_ENABLED(CONFIG_IPV6)
677 case AF_INET6:
678 return inet6_sk(sk)->mc_loop;
679#endif
680 }
681 WARN_ON(1);
682 return true;
683}
684EXPORT_SYMBOL(sk_mc_loop);
685
686
687
688
689
690
691int sock_setsockopt(struct socket *sock, int level, int optname,
692 char __user *optval, unsigned int optlen)
693{
694 struct sock *sk = sock->sk;
695 int val;
696 int valbool;
697 struct linger ling;
698 int ret = 0;
699
700
701
702
703
704 if (optname == SO_BINDTODEVICE)
705 return sock_setbindtodevice(sk, optval, optlen);
706
707 if (optlen < sizeof(int))
708 return -EINVAL;
709
710 if (get_user(val, (int __user *)optval))
711 return -EFAULT;
712
713 valbool = val ? 1 : 0;
714
715 lock_sock(sk);
716
717 switch (optname) {
718 case SO_DEBUG:
719 if (val && !capable(CAP_NET_ADMIN))
720 ret = -EACCES;
721 else
722 sock_valbool_flag(sk, SOCK_DBG, valbool);
723 break;
724 case SO_REUSEADDR:
725 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
726 break;
727 case SO_REUSEPORT:
728 sk->sk_reuseport = valbool;
729 break;
730 case SO_TYPE:
731 case SO_PROTOCOL:
732 case SO_DOMAIN:
733 case SO_ERROR:
734 ret = -ENOPROTOOPT;
735 break;
736 case SO_DONTROUTE:
737 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
738 break;
739 case SO_BROADCAST:
740 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
741 break;
742 case SO_SNDBUF:
743
744
745
746
747
748 val = min_t(u32, val, sysctl_wmem_max);
749set_sndbuf:
750 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
751 sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF);
752
753 sk->sk_write_space(sk);
754 break;
755
756 case SO_SNDBUFFORCE:
757 if (!capable(CAP_NET_ADMIN)) {
758 ret = -EPERM;
759 break;
760 }
761 goto set_sndbuf;
762
763 case SO_RCVBUF:
764
765
766
767
768
769 val = min_t(u32, val, sysctl_rmem_max);
770set_rcvbuf:
771 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787 sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF);
788 break;
789
790 case SO_RCVBUFFORCE:
791 if (!capable(CAP_NET_ADMIN)) {
792 ret = -EPERM;
793 break;
794 }
795 goto set_rcvbuf;
796
797 case SO_KEEPALIVE:
798 if (sk->sk_prot->keepalive)
799 sk->sk_prot->keepalive(sk, valbool);
800 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
801 break;
802
803 case SO_OOBINLINE:
804 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
805 break;
806
807 case SO_NO_CHECK:
808 sk->sk_no_check_tx = valbool;
809 break;
810
811 case SO_PRIORITY:
812 if ((val >= 0 && val <= 6) ||
813 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
814 sk->sk_priority = val;
815 else
816 ret = -EPERM;
817 break;
818
819 case SO_LINGER:
820 if (optlen < sizeof(ling)) {
821 ret = -EINVAL;
822 break;
823 }
824 if (copy_from_user(&ling, optval, sizeof(ling))) {
825 ret = -EFAULT;
826 break;
827 }
828 if (!ling.l_onoff)
829 sock_reset_flag(sk, SOCK_LINGER);
830 else {
831#if (BITS_PER_LONG == 32)
832 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
833 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
834 else
835#endif
836 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
837 sock_set_flag(sk, SOCK_LINGER);
838 }
839 break;
840
841 case SO_BSDCOMPAT:
842 sock_warn_obsolete_bsdism("setsockopt");
843 break;
844
845 case SO_PASSCRED:
846 if (valbool)
847 set_bit(SOCK_PASSCRED, &sock->flags);
848 else
849 clear_bit(SOCK_PASSCRED, &sock->flags);
850 break;
851
852 case SO_TIMESTAMP:
853 case SO_TIMESTAMPNS:
854 if (valbool) {
855 if (optname == SO_TIMESTAMP)
856 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
857 else
858 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
859 sock_set_flag(sk, SOCK_RCVTSTAMP);
860 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
861 } else {
862 sock_reset_flag(sk, SOCK_RCVTSTAMP);
863 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
864 }
865 break;
866
867 case SO_TIMESTAMPING:
868 if (val & ~SOF_TIMESTAMPING_MASK) {
869 ret = -EINVAL;
870 break;
871 }
872
873 if (val & SOF_TIMESTAMPING_OPT_ID &&
874 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
875 if (sk->sk_protocol == IPPROTO_TCP &&
876 sk->sk_type == SOCK_STREAM) {
877 if ((1 << sk->sk_state) &
878 (TCPF_CLOSE | TCPF_LISTEN)) {
879 ret = -EINVAL;
880 break;
881 }
882 sk->sk_tskey = tcp_sk(sk)->snd_una;
883 } else {
884 sk->sk_tskey = 0;
885 }
886 }
887
888 if (val & SOF_TIMESTAMPING_OPT_STATS &&
889 !(val & SOF_TIMESTAMPING_OPT_TSONLY)) {
890 ret = -EINVAL;
891 break;
892 }
893
894 sk->sk_tsflags = val;
895 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
896 sock_enable_timestamp(sk,
897 SOCK_TIMESTAMPING_RX_SOFTWARE);
898 else
899 sock_disable_timestamp(sk,
900 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
901 break;
902
903 case SO_RCVLOWAT:
904 if (val < 0)
905 val = INT_MAX;
906 sk->sk_rcvlowat = val ? : 1;
907 break;
908
909 case SO_RCVTIMEO:
910 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
911 break;
912
913 case SO_SNDTIMEO:
914 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
915 break;
916
917 case SO_ATTACH_FILTER:
918 ret = -EINVAL;
919 if (optlen == sizeof(struct sock_fprog)) {
920 struct sock_fprog fprog;
921
922 ret = -EFAULT;
923 if (copy_from_user(&fprog, optval, sizeof(fprog)))
924 break;
925
926 ret = sk_attach_filter(&fprog, sk);
927 }
928 break;
929
930 case SO_ATTACH_BPF:
931 ret = -EINVAL;
932 if (optlen == sizeof(u32)) {
933 u32 ufd;
934
935 ret = -EFAULT;
936 if (copy_from_user(&ufd, optval, sizeof(ufd)))
937 break;
938
939 ret = sk_attach_bpf(ufd, sk);
940 }
941 break;
942
943 case SO_ATTACH_REUSEPORT_CBPF:
944 ret = -EINVAL;
945 if (optlen == sizeof(struct sock_fprog)) {
946 struct sock_fprog fprog;
947
948 ret = -EFAULT;
949 if (copy_from_user(&fprog, optval, sizeof(fprog)))
950 break;
951
952 ret = sk_reuseport_attach_filter(&fprog, sk);
953 }
954 break;
955
956 case SO_ATTACH_REUSEPORT_EBPF:
957 ret = -EINVAL;
958 if (optlen == sizeof(u32)) {
959 u32 ufd;
960
961 ret = -EFAULT;
962 if (copy_from_user(&ufd, optval, sizeof(ufd)))
963 break;
964
965 ret = sk_reuseport_attach_bpf(ufd, sk);
966 }
967 break;
968
969 case SO_DETACH_FILTER:
970 ret = sk_detach_filter(sk);
971 break;
972
973 case SO_LOCK_FILTER:
974 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
975 ret = -EPERM;
976 else
977 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
978 break;
979
980 case SO_PASSSEC:
981 if (valbool)
982 set_bit(SOCK_PASSSEC, &sock->flags);
983 else
984 clear_bit(SOCK_PASSSEC, &sock->flags);
985 break;
986 case SO_MARK:
987 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
988 ret = -EPERM;
989 else
990 sk->sk_mark = val;
991 break;
992
993 case SO_RXQ_OVFL:
994 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
995 break;
996
997 case SO_WIFI_STATUS:
998 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
999 break;
1000
1001 case SO_PEEK_OFF:
1002 if (sock->ops->set_peek_off)
1003 ret = sock->ops->set_peek_off(sk, val);
1004 else
1005 ret = -EOPNOTSUPP;
1006 break;
1007
1008 case SO_NOFCS:
1009 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
1010 break;
1011
1012 case SO_SELECT_ERR_QUEUE:
1013 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
1014 break;
1015
1016#ifdef CONFIG_NET_RX_BUSY_POLL
1017 case SO_BUSY_POLL:
1018
1019 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
1020 ret = -EPERM;
1021 else {
1022 if (val < 0)
1023 ret = -EINVAL;
1024 else
1025 sk->sk_ll_usec = val;
1026 }
1027 break;
1028#endif
1029
1030 case SO_MAX_PACING_RATE:
1031 if (val != ~0U)
1032 cmpxchg(&sk->sk_pacing_status,
1033 SK_PACING_NONE,
1034 SK_PACING_NEEDED);
1035 sk->sk_max_pacing_rate = val;
1036 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
1037 sk->sk_max_pacing_rate);
1038 break;
1039
1040 case SO_INCOMING_CPU:
1041 sk->sk_incoming_cpu = val;
1042 break;
1043
1044 case SO_CNX_ADVICE:
1045 if (val == 1)
1046 dst_negative_advice(sk);
1047 break;
1048
1049 case SO_ZEROCOPY:
1050 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
1051 ret = -ENOTSUPP;
1052 else if (sk->sk_protocol != IPPROTO_TCP)
1053 ret = -ENOTSUPP;
1054 else if (sk->sk_state != TCP_CLOSE)
1055 ret = -EBUSY;
1056 else if (val < 0 || val > 1)
1057 ret = -EINVAL;
1058 else
1059 sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool);
1060 break;
1061
1062 default:
1063 ret = -ENOPROTOOPT;
1064 break;
1065 }
1066 release_sock(sk);
1067 return ret;
1068}
1069EXPORT_SYMBOL(sock_setsockopt);
1070
1071
1072static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1073 struct ucred *ucred)
1074{
1075 ucred->pid = pid_vnr(pid);
1076 ucred->uid = ucred->gid = -1;
1077 if (cred) {
1078 struct user_namespace *current_ns = current_user_ns();
1079
1080 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1081 ucred->gid = from_kgid_munged(current_ns, cred->egid);
1082 }
1083}
1084
1085static int groups_to_user(gid_t __user *dst, const struct group_info *src)
1086{
1087 struct user_namespace *user_ns = current_user_ns();
1088 int i;
1089
1090 for (i = 0; i < src->ngroups; i++)
1091 if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i))
1092 return -EFAULT;
1093
1094 return 0;
1095}
1096
1097int sock_getsockopt(struct socket *sock, int level, int optname,
1098 char __user *optval, int __user *optlen)
1099{
1100 struct sock *sk = sock->sk;
1101
1102 union {
1103 int val;
1104 u64 val64;
1105 struct linger ling;
1106 struct timeval tm;
1107 } v;
1108
1109 int lv = sizeof(int);
1110 int len;
1111
1112 if (get_user(len, optlen))
1113 return -EFAULT;
1114 if (len < 0)
1115 return -EINVAL;
1116
1117 memset(&v, 0, sizeof(v));
1118
1119 switch (optname) {
1120 case SO_DEBUG:
1121 v.val = sock_flag(sk, SOCK_DBG);
1122 break;
1123
1124 case SO_DONTROUTE:
1125 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1126 break;
1127
1128 case SO_BROADCAST:
1129 v.val = sock_flag(sk, SOCK_BROADCAST);
1130 break;
1131
1132 case SO_SNDBUF:
1133 v.val = sk->sk_sndbuf;
1134 break;
1135
1136 case SO_RCVBUF:
1137 v.val = sk->sk_rcvbuf;
1138 break;
1139
1140 case SO_REUSEADDR:
1141 v.val = sk->sk_reuse;
1142 break;
1143
1144 case SO_REUSEPORT:
1145 v.val = sk->sk_reuseport;
1146 break;
1147
1148 case SO_KEEPALIVE:
1149 v.val = sock_flag(sk, SOCK_KEEPOPEN);
1150 break;
1151
1152 case SO_TYPE:
1153 v.val = sk->sk_type;
1154 break;
1155
1156 case SO_PROTOCOL:
1157 v.val = sk->sk_protocol;
1158 break;
1159
1160 case SO_DOMAIN:
1161 v.val = sk->sk_family;
1162 break;
1163
1164 case SO_ERROR:
1165 v.val = -sock_error(sk);
1166 if (v.val == 0)
1167 v.val = xchg(&sk->sk_err_soft, 0);
1168 break;
1169
1170 case SO_OOBINLINE:
1171 v.val = sock_flag(sk, SOCK_URGINLINE);
1172 break;
1173
1174 case SO_NO_CHECK:
1175 v.val = sk->sk_no_check_tx;
1176 break;
1177
1178 case SO_PRIORITY:
1179 v.val = sk->sk_priority;
1180 break;
1181
1182 case SO_LINGER:
1183 lv = sizeof(v.ling);
1184 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
1185 v.ling.l_linger = sk->sk_lingertime / HZ;
1186 break;
1187
1188 case SO_BSDCOMPAT:
1189 sock_warn_obsolete_bsdism("getsockopt");
1190 break;
1191
1192 case SO_TIMESTAMP:
1193 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1194 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1195 break;
1196
1197 case SO_TIMESTAMPNS:
1198 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
1199 break;
1200
1201 case SO_TIMESTAMPING:
1202 v.val = sk->sk_tsflags;
1203 break;
1204
1205 case SO_RCVTIMEO:
1206 lv = sizeof(struct timeval);
1207 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1208 v.tm.tv_sec = 0;
1209 v.tm.tv_usec = 0;
1210 } else {
1211 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1212 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * USEC_PER_SEC) / HZ;
1213 }
1214 break;
1215
1216 case SO_SNDTIMEO:
1217 lv = sizeof(struct timeval);
1218 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1219 v.tm.tv_sec = 0;
1220 v.tm.tv_usec = 0;
1221 } else {
1222 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1223 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * USEC_PER_SEC) / HZ;
1224 }
1225 break;
1226
1227 case SO_RCVLOWAT:
1228 v.val = sk->sk_rcvlowat;
1229 break;
1230
1231 case SO_SNDLOWAT:
1232 v.val = 1;
1233 break;
1234
1235 case SO_PASSCRED:
1236 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1237 break;
1238
1239 case SO_PEERCRED:
1240 {
1241 struct ucred peercred;
1242 if (len > sizeof(peercred))
1243 len = sizeof(peercred);
1244 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1245 if (copy_to_user(optval, &peercred, len))
1246 return -EFAULT;
1247 goto lenout;
1248 }
1249
1250 case SO_PEERGROUPS:
1251 {
1252 int ret, n;
1253
1254 if (!sk->sk_peer_cred)
1255 return -ENODATA;
1256
1257 n = sk->sk_peer_cred->group_info->ngroups;
1258 if (len < n * sizeof(gid_t)) {
1259 len = n * sizeof(gid_t);
1260 return put_user(len, optlen) ? -EFAULT : -ERANGE;
1261 }
1262 len = n * sizeof(gid_t);
1263
1264 ret = groups_to_user((gid_t __user *)optval,
1265 sk->sk_peer_cred->group_info);
1266 if (ret)
1267 return ret;
1268 goto lenout;
1269 }
1270
1271 case SO_PEERNAME:
1272 {
1273 char address[128];
1274
1275 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1276 return -ENOTCONN;
1277 if (lv < len)
1278 return -EINVAL;
1279 if (copy_to_user(optval, address, len))
1280 return -EFAULT;
1281 goto lenout;
1282 }
1283
1284
1285
1286
1287 case SO_ACCEPTCONN:
1288 v.val = sk->sk_state == TCP_LISTEN;
1289 break;
1290
1291 case SO_PASSSEC:
1292 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1293 break;
1294
1295 case SO_PEERSEC:
1296 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1297
1298 case SO_MARK:
1299 v.val = sk->sk_mark;
1300 break;
1301
1302 case SO_RXQ_OVFL:
1303 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1304 break;
1305
1306 case SO_WIFI_STATUS:
1307 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1308 break;
1309
1310 case SO_PEEK_OFF:
1311 if (!sock->ops->set_peek_off)
1312 return -EOPNOTSUPP;
1313
1314 v.val = sk->sk_peek_off;
1315 break;
1316 case SO_NOFCS:
1317 v.val = sock_flag(sk, SOCK_NOFCS);
1318 break;
1319
1320 case SO_BINDTODEVICE:
1321 return sock_getbindtodevice(sk, optval, optlen, len);
1322
1323 case SO_GET_FILTER:
1324 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1325 if (len < 0)
1326 return len;
1327
1328 goto lenout;
1329
1330 case SO_LOCK_FILTER:
1331 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1332 break;
1333
1334 case SO_BPF_EXTENSIONS:
1335 v.val = bpf_tell_extensions();
1336 break;
1337
1338 case SO_SELECT_ERR_QUEUE:
1339 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1340 break;
1341
1342#ifdef CONFIG_NET_RX_BUSY_POLL
1343 case SO_BUSY_POLL:
1344 v.val = sk->sk_ll_usec;
1345 break;
1346#endif
1347
1348 case SO_MAX_PACING_RATE:
1349 v.val = sk->sk_max_pacing_rate;
1350 break;
1351
1352 case SO_INCOMING_CPU:
1353 v.val = sk->sk_incoming_cpu;
1354 break;
1355
1356 case SO_MEMINFO:
1357 {
1358 u32 meminfo[SK_MEMINFO_VARS];
1359
1360 if (get_user(len, optlen))
1361 return -EFAULT;
1362
1363 sk_get_meminfo(sk, meminfo);
1364
1365 len = min_t(unsigned int, len, sizeof(meminfo));
1366 if (copy_to_user(optval, &meminfo, len))
1367 return -EFAULT;
1368
1369 goto lenout;
1370 }
1371
1372#ifdef CONFIG_NET_RX_BUSY_POLL
1373 case SO_INCOMING_NAPI_ID:
1374 v.val = READ_ONCE(sk->sk_napi_id);
1375
1376
1377 if (v.val < MIN_NAPI_ID)
1378 v.val = 0;
1379
1380 break;
1381#endif
1382
1383 case SO_COOKIE:
1384 lv = sizeof(u64);
1385 if (len < lv)
1386 return -EINVAL;
1387 v.val64 = sock_gen_cookie(sk);
1388 break;
1389
1390 case SO_ZEROCOPY:
1391 v.val = sock_flag(sk, SOCK_ZEROCOPY);
1392 break;
1393
1394 default:
1395
1396
1397
1398 return -ENOPROTOOPT;
1399 }
1400
1401 if (len > lv)
1402 len = lv;
1403 if (copy_to_user(optval, &v, len))
1404 return -EFAULT;
1405lenout:
1406 if (put_user(len, optlen))
1407 return -EFAULT;
1408 return 0;
1409}
1410
1411
1412
1413
1414
1415
1416static inline void sock_lock_init(struct sock *sk)
1417{
1418 if (sk->sk_kern_sock)
1419 sock_lock_init_class_and_name(
1420 sk,
1421 af_family_kern_slock_key_strings[sk->sk_family],
1422 af_family_kern_slock_keys + sk->sk_family,
1423 af_family_kern_key_strings[sk->sk_family],
1424 af_family_kern_keys + sk->sk_family);
1425 else
1426 sock_lock_init_class_and_name(
1427 sk,
1428 af_family_slock_key_strings[sk->sk_family],
1429 af_family_slock_keys + sk->sk_family,
1430 af_family_key_strings[sk->sk_family],
1431 af_family_keys + sk->sk_family);
1432}
1433
1434
1435
1436
1437
1438
1439static void sock_copy(struct sock *nsk, const struct sock *osk)
1440{
1441#ifdef CONFIG_SECURITY_NETWORK
1442 void *sptr = nsk->sk_security;
1443#endif
1444 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1445
1446 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1447 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1448
1449#ifdef CONFIG_SECURITY_NETWORK
1450 nsk->sk_security = sptr;
1451 security_sk_clone(osk, nsk);
1452#endif
1453}
1454
1455static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1456 int family)
1457{
1458 struct sock *sk;
1459 struct kmem_cache *slab;
1460
1461 slab = prot->slab;
1462 if (slab != NULL) {
1463 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1464 if (!sk)
1465 return sk;
1466 if (priority & __GFP_ZERO)
1467 sk_prot_clear_nulls(sk, prot->obj_size);
1468 } else
1469 sk = kmalloc(prot->obj_size, priority);
1470
1471 if (sk != NULL) {
1472 kmemcheck_annotate_bitfield(sk, flags);
1473
1474 if (security_sk_alloc(sk, family, priority))
1475 goto out_free;
1476
1477 if (!try_module_get(prot->owner))
1478 goto out_free_sec;
1479 sk_tx_queue_clear(sk);
1480 }
1481
1482 return sk;
1483
1484out_free_sec:
1485 security_sk_free(sk);
1486out_free:
1487 if (slab != NULL)
1488 kmem_cache_free(slab, sk);
1489 else
1490 kfree(sk);
1491 return NULL;
1492}
1493
1494static void sk_prot_free(struct proto *prot, struct sock *sk)
1495{
1496 struct kmem_cache *slab;
1497 struct module *owner;
1498
1499 owner = prot->owner;
1500 slab = prot->slab;
1501
1502 cgroup_sk_free(&sk->sk_cgrp_data);
1503 mem_cgroup_sk_free(sk);
1504 security_sk_free(sk);
1505 if (slab != NULL)
1506 kmem_cache_free(slab, sk);
1507 else
1508 kfree(sk);
1509 module_put(owner);
1510}
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1521 struct proto *prot, int kern)
1522{
1523 struct sock *sk;
1524
1525 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1526 if (sk) {
1527 sk->sk_family = family;
1528
1529
1530
1531
1532 sk->sk_prot = sk->sk_prot_creator = prot;
1533 sk->sk_kern_sock = kern;
1534 sock_lock_init(sk);
1535 sk->sk_net_refcnt = kern ? 0 : 1;
1536 if (likely(sk->sk_net_refcnt))
1537 get_net(net);
1538 sock_net_set(sk, net);
1539 refcount_set(&sk->sk_wmem_alloc, 1);
1540
1541 mem_cgroup_sk_alloc(sk);
1542 cgroup_sk_alloc(&sk->sk_cgrp_data);
1543 sock_update_classid(&sk->sk_cgrp_data);
1544 sock_update_netprioidx(&sk->sk_cgrp_data);
1545 }
1546
1547 return sk;
1548}
1549EXPORT_SYMBOL(sk_alloc);
1550
1551
1552
1553
1554static void __sk_destruct(struct rcu_head *head)
1555{
1556 struct sock *sk = container_of(head, struct sock, sk_rcu);
1557 struct sk_filter *filter;
1558
1559 if (sk->sk_destruct)
1560 sk->sk_destruct(sk);
1561
1562 filter = rcu_dereference_check(sk->sk_filter,
1563 refcount_read(&sk->sk_wmem_alloc) == 0);
1564 if (filter) {
1565 sk_filter_uncharge(sk, filter);
1566 RCU_INIT_POINTER(sk->sk_filter, NULL);
1567 }
1568 if (rcu_access_pointer(sk->sk_reuseport_cb))
1569 reuseport_detach_sock(sk);
1570
1571 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1572
1573 if (atomic_read(&sk->sk_omem_alloc))
1574 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1575 __func__, atomic_read(&sk->sk_omem_alloc));
1576
1577 if (sk->sk_frag.page) {
1578 put_page(sk->sk_frag.page);
1579 sk->sk_frag.page = NULL;
1580 }
1581
1582 if (sk->sk_peer_cred)
1583 put_cred(sk->sk_peer_cred);
1584 put_pid(sk->sk_peer_pid);
1585 if (likely(sk->sk_net_refcnt))
1586 put_net(sock_net(sk));
1587 sk_prot_free(sk->sk_prot_creator, sk);
1588}
1589
1590void sk_destruct(struct sock *sk)
1591{
1592 if (sock_flag(sk, SOCK_RCU_FREE))
1593 call_rcu(&sk->sk_rcu, __sk_destruct);
1594 else
1595 __sk_destruct(&sk->sk_rcu);
1596}
1597
1598static void __sk_free(struct sock *sk)
1599{
1600 if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt))
1601 sock_diag_broadcast_destroy(sk);
1602 else
1603 sk_destruct(sk);
1604}
1605
1606void sk_free(struct sock *sk)
1607{
1608
1609
1610
1611
1612
1613 if (refcount_dec_and_test(&sk->sk_wmem_alloc))
1614 __sk_free(sk);
1615}
1616EXPORT_SYMBOL(sk_free);
1617
1618static void sk_init_common(struct sock *sk)
1619{
1620 skb_queue_head_init(&sk->sk_receive_queue);
1621 skb_queue_head_init(&sk->sk_write_queue);
1622 skb_queue_head_init(&sk->sk_error_queue);
1623
1624 rwlock_init(&sk->sk_callback_lock);
1625 lockdep_set_class_and_name(&sk->sk_receive_queue.lock,
1626 af_rlock_keys + sk->sk_family,
1627 af_family_rlock_key_strings[sk->sk_family]);
1628 lockdep_set_class_and_name(&sk->sk_write_queue.lock,
1629 af_wlock_keys + sk->sk_family,
1630 af_family_wlock_key_strings[sk->sk_family]);
1631 lockdep_set_class_and_name(&sk->sk_error_queue.lock,
1632 af_elock_keys + sk->sk_family,
1633 af_family_elock_key_strings[sk->sk_family]);
1634 lockdep_set_class_and_name(&sk->sk_callback_lock,
1635 af_callback_keys + sk->sk_family,
1636 af_family_clock_key_strings[sk->sk_family]);
1637}
1638
1639
1640
1641
1642
1643
1644
1645
1646struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1647{
1648 struct sock *newsk;
1649 bool is_charged = true;
1650
1651 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1652 if (newsk != NULL) {
1653 struct sk_filter *filter;
1654
1655 sock_copy(newsk, sk);
1656
1657 newsk->sk_prot_creator = sk->sk_prot;
1658
1659
1660 if (likely(newsk->sk_net_refcnt))
1661 get_net(sock_net(newsk));
1662 sk_node_init(&newsk->sk_node);
1663 sock_lock_init(newsk);
1664 bh_lock_sock(newsk);
1665 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1666 newsk->sk_backlog.len = 0;
1667
1668 atomic_set(&newsk->sk_rmem_alloc, 0);
1669
1670
1671
1672 refcount_set(&newsk->sk_wmem_alloc, 1);
1673 atomic_set(&newsk->sk_omem_alloc, 0);
1674 sk_init_common(newsk);
1675
1676 newsk->sk_dst_cache = NULL;
1677 newsk->sk_dst_pending_confirm = 0;
1678 newsk->sk_wmem_queued = 0;
1679 newsk->sk_forward_alloc = 0;
1680
1681
1682 newsk->sk_memcg = NULL;
1683
1684 atomic_set(&newsk->sk_drops, 0);
1685 newsk->sk_send_head = NULL;
1686 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1687 atomic_set(&newsk->sk_zckey, 0);
1688
1689 sock_reset_flag(newsk, SOCK_DONE);
1690 cgroup_sk_alloc(&newsk->sk_cgrp_data);
1691
1692 rcu_read_lock();
1693 filter = rcu_dereference(sk->sk_filter);
1694 if (filter != NULL)
1695
1696
1697
1698
1699 is_charged = sk_filter_charge(newsk, filter);
1700 RCU_INIT_POINTER(newsk->sk_filter, filter);
1701 rcu_read_unlock();
1702
1703 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
1704
1705
1706
1707
1708 if (!is_charged)
1709 RCU_INIT_POINTER(newsk->sk_filter, NULL);
1710 sk_free_unlock_clone(newsk);
1711 newsk = NULL;
1712 goto out;
1713 }
1714 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
1715
1716 newsk->sk_err = 0;
1717 newsk->sk_err_soft = 0;
1718 newsk->sk_priority = 0;
1719 newsk->sk_incoming_cpu = raw_smp_processor_id();
1720 atomic64_set(&newsk->sk_cookie, 0);
1721
1722
1723
1724
1725
1726 smp_wmb();
1727 refcount_set(&newsk->sk_refcnt, 2);
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740 sk_refcnt_debug_inc(newsk);
1741 sk_set_socket(newsk, NULL);
1742 newsk->sk_wq = NULL;
1743
1744 if (newsk->sk_prot->sockets_allocated)
1745 sk_sockets_allocated_inc(newsk);
1746
1747 if (sock_needs_netstamp(sk) &&
1748 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1749 net_enable_timestamp();
1750 }
1751out:
1752 return newsk;
1753}
1754EXPORT_SYMBOL_GPL(sk_clone_lock);
1755
1756void sk_free_unlock_clone(struct sock *sk)
1757{
1758
1759
1760 sk->sk_destruct = NULL;
1761 bh_unlock_sock(sk);
1762 sk_free(sk);
1763}
1764EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
1765
1766void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1767{
1768 u32 max_segs = 1;
1769
1770 sk_dst_set(sk, dst);
1771 sk->sk_route_caps = dst->dev->features;
1772 if (sk->sk_route_caps & NETIF_F_GSO)
1773 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1774 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1775 if (sk_can_gso(sk)) {
1776 if (dst->header_len && !xfrm_dst_offload_ok(dst)) {
1777 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1778 } else {
1779 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1780 sk->sk_gso_max_size = dst->dev->gso_max_size;
1781 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
1782 }
1783 }
1784 sk->sk_gso_max_segs = max_segs;
1785}
1786EXPORT_SYMBOL_GPL(sk_setup_caps);
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796void sock_wfree(struct sk_buff *skb)
1797{
1798 struct sock *sk = skb->sk;
1799 unsigned int len = skb->truesize;
1800
1801 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1802
1803
1804
1805
1806 WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc));
1807 sk->sk_write_space(sk);
1808 len = 1;
1809 }
1810
1811
1812
1813
1814 if (refcount_sub_and_test(len, &sk->sk_wmem_alloc))
1815 __sk_free(sk);
1816}
1817EXPORT_SYMBOL(sock_wfree);
1818
1819
1820
1821
1822void __sock_wfree(struct sk_buff *skb)
1823{
1824 struct sock *sk = skb->sk;
1825
1826 if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
1827 __sk_free(sk);
1828}
1829
1830void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1831{
1832 skb_orphan(skb);
1833 skb->sk = sk;
1834#ifdef CONFIG_INET
1835 if (unlikely(!sk_fullsock(sk))) {
1836 skb->destructor = sock_edemux;
1837 sock_hold(sk);
1838 return;
1839 }
1840#endif
1841 skb->destructor = sock_wfree;
1842 skb_set_hash_from_sk(skb, sk);
1843
1844
1845
1846
1847
1848 refcount_add(skb->truesize, &sk->sk_wmem_alloc);
1849}
1850EXPORT_SYMBOL(skb_set_owner_w);
1851
1852
1853
1854
1855
1856
1857
1858void skb_orphan_partial(struct sk_buff *skb)
1859{
1860 if (skb_is_tcp_pure_ack(skb))
1861 return;
1862
1863 if (skb->destructor == sock_wfree
1864#ifdef CONFIG_INET
1865 || skb->destructor == tcp_wfree
1866#endif
1867 ) {
1868 struct sock *sk = skb->sk;
1869
1870 if (refcount_inc_not_zero(&sk->sk_refcnt)) {
1871 WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc));
1872 skb->destructor = sock_efree;
1873 }
1874 } else {
1875 skb_orphan(skb);
1876 }
1877}
1878EXPORT_SYMBOL(skb_orphan_partial);
1879
1880
1881
1882
1883void sock_rfree(struct sk_buff *skb)
1884{
1885 struct sock *sk = skb->sk;
1886 unsigned int len = skb->truesize;
1887
1888 atomic_sub(len, &sk->sk_rmem_alloc);
1889 sk_mem_uncharge(sk, len);
1890}
1891EXPORT_SYMBOL(sock_rfree);
1892
1893
1894
1895
1896
1897void sock_efree(struct sk_buff *skb)
1898{
1899 sock_put(skb->sk);
1900}
1901EXPORT_SYMBOL(sock_efree);
1902
1903kuid_t sock_i_uid(struct sock *sk)
1904{
1905 kuid_t uid;
1906
1907 read_lock_bh(&sk->sk_callback_lock);
1908 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
1909 read_unlock_bh(&sk->sk_callback_lock);
1910 return uid;
1911}
1912EXPORT_SYMBOL(sock_i_uid);
1913
1914unsigned long sock_i_ino(struct sock *sk)
1915{
1916 unsigned long ino;
1917
1918 read_lock_bh(&sk->sk_callback_lock);
1919 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1920 read_unlock_bh(&sk->sk_callback_lock);
1921 return ino;
1922}
1923EXPORT_SYMBOL(sock_i_ino);
1924
1925
1926
1927
1928struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1929 gfp_t priority)
1930{
1931 if (force || refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1932 struct sk_buff *skb = alloc_skb(size, priority);
1933 if (skb) {
1934 skb_set_owner_w(skb, sk);
1935 return skb;
1936 }
1937 }
1938 return NULL;
1939}
1940EXPORT_SYMBOL(sock_wmalloc);
1941
1942static void sock_ofree(struct sk_buff *skb)
1943{
1944 struct sock *sk = skb->sk;
1945
1946 atomic_sub(skb->truesize, &sk->sk_omem_alloc);
1947}
1948
1949struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size,
1950 gfp_t priority)
1951{
1952 struct sk_buff *skb;
1953
1954
1955 if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) >
1956 sysctl_optmem_max)
1957 return NULL;
1958
1959 skb = alloc_skb(size, priority);
1960 if (!skb)
1961 return NULL;
1962
1963 atomic_add(skb->truesize, &sk->sk_omem_alloc);
1964 skb->sk = sk;
1965 skb->destructor = sock_ofree;
1966 return skb;
1967}
1968
1969
1970
1971
1972void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1973{
1974 if ((unsigned int)size <= sysctl_optmem_max &&
1975 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1976 void *mem;
1977
1978
1979
1980 atomic_add(size, &sk->sk_omem_alloc);
1981 mem = kmalloc(size, priority);
1982 if (mem)
1983 return mem;
1984 atomic_sub(size, &sk->sk_omem_alloc);
1985 }
1986 return NULL;
1987}
1988EXPORT_SYMBOL(sock_kmalloc);
1989
1990
1991
1992
1993
1994static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1995 const bool nullify)
1996{
1997 if (WARN_ON_ONCE(!mem))
1998 return;
1999 if (nullify)
2000 kzfree(mem);
2001 else
2002 kfree(mem);
2003 atomic_sub(size, &sk->sk_omem_alloc);
2004}
2005
2006void sock_kfree_s(struct sock *sk, void *mem, int size)
2007{
2008 __sock_kfree_s(sk, mem, size, false);
2009}
2010EXPORT_SYMBOL(sock_kfree_s);
2011
2012void sock_kzfree_s(struct sock *sk, void *mem, int size)
2013{
2014 __sock_kfree_s(sk, mem, size, true);
2015}
2016EXPORT_SYMBOL(sock_kzfree_s);
2017
2018
2019
2020
2021static long sock_wait_for_wmem(struct sock *sk, long timeo)
2022{
2023 DEFINE_WAIT(wait);
2024
2025 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2026 for (;;) {
2027 if (!timeo)
2028 break;
2029 if (signal_pending(current))
2030 break;
2031 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2032 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2033 if (refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
2034 break;
2035 if (sk->sk_shutdown & SEND_SHUTDOWN)
2036 break;
2037 if (sk->sk_err)
2038 break;
2039 timeo = schedule_timeout(timeo);
2040 }
2041 finish_wait(sk_sleep(sk), &wait);
2042 return timeo;
2043}
2044
2045
2046
2047
2048
2049
2050struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
2051 unsigned long data_len, int noblock,
2052 int *errcode, int max_page_order)
2053{
2054 struct sk_buff *skb;
2055 long timeo;
2056 int err;
2057
2058 timeo = sock_sndtimeo(sk, noblock);
2059 for (;;) {
2060 err = sock_error(sk);
2061 if (err != 0)
2062 goto failure;
2063
2064 err = -EPIPE;
2065 if (sk->sk_shutdown & SEND_SHUTDOWN)
2066 goto failure;
2067
2068 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
2069 break;
2070
2071 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2072 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2073 err = -EAGAIN;
2074 if (!timeo)
2075 goto failure;
2076 if (signal_pending(current))
2077 goto interrupted;
2078 timeo = sock_wait_for_wmem(sk, timeo);
2079 }
2080 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
2081 errcode, sk->sk_allocation);
2082 if (skb)
2083 skb_set_owner_w(skb, sk);
2084 return skb;
2085
2086interrupted:
2087 err = sock_intr_errno(timeo);
2088failure:
2089 *errcode = err;
2090 return NULL;
2091}
2092EXPORT_SYMBOL(sock_alloc_send_pskb);
2093
2094struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
2095 int noblock, int *errcode)
2096{
2097 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
2098}
2099EXPORT_SYMBOL(sock_alloc_send_skb);
2100
2101int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
2102 struct sockcm_cookie *sockc)
2103{
2104 u32 tsflags;
2105
2106 switch (cmsg->cmsg_type) {
2107 case SO_MARK:
2108 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2109 return -EPERM;
2110 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2111 return -EINVAL;
2112 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
2113 break;
2114 case SO_TIMESTAMPING:
2115 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2116 return -EINVAL;
2117
2118 tsflags = *(u32 *)CMSG_DATA(cmsg);
2119 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
2120 return -EINVAL;
2121
2122 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
2123 sockc->tsflags |= tsflags;
2124 break;
2125
2126 case SCM_RIGHTS:
2127 case SCM_CREDENTIALS:
2128 break;
2129 default:
2130 return -EINVAL;
2131 }
2132 return 0;
2133}
2134EXPORT_SYMBOL(__sock_cmsg_send);
2135
2136int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
2137 struct sockcm_cookie *sockc)
2138{
2139 struct cmsghdr *cmsg;
2140 int ret;
2141
2142 for_each_cmsghdr(cmsg, msg) {
2143 if (!CMSG_OK(msg, cmsg))
2144 return -EINVAL;
2145 if (cmsg->cmsg_level != SOL_SOCKET)
2146 continue;
2147 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
2148 if (ret)
2149 return ret;
2150 }
2151 return 0;
2152}
2153EXPORT_SYMBOL(sock_cmsg_send);
2154
2155static void sk_enter_memory_pressure(struct sock *sk)
2156{
2157 if (!sk->sk_prot->enter_memory_pressure)
2158 return;
2159
2160 sk->sk_prot->enter_memory_pressure(sk);
2161}
2162
2163static void sk_leave_memory_pressure(struct sock *sk)
2164{
2165 if (sk->sk_prot->leave_memory_pressure) {
2166 sk->sk_prot->leave_memory_pressure(sk);
2167 } else {
2168 unsigned long *memory_pressure = sk->sk_prot->memory_pressure;
2169
2170 if (memory_pressure && *memory_pressure)
2171 *memory_pressure = 0;
2172 }
2173}
2174
2175
2176#define SKB_FRAG_PAGE_ORDER get_order(32768)
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
2189{
2190 if (pfrag->page) {
2191 if (page_ref_count(pfrag->page) == 1) {
2192 pfrag->offset = 0;
2193 return true;
2194 }
2195 if (pfrag->offset + sz <= pfrag->size)
2196 return true;
2197 put_page(pfrag->page);
2198 }
2199
2200 pfrag->offset = 0;
2201 if (SKB_FRAG_PAGE_ORDER) {
2202
2203 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
2204 __GFP_COMP | __GFP_NOWARN |
2205 __GFP_NORETRY,
2206 SKB_FRAG_PAGE_ORDER);
2207 if (likely(pfrag->page)) {
2208 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
2209 return true;
2210 }
2211 }
2212 pfrag->page = alloc_page(gfp);
2213 if (likely(pfrag->page)) {
2214 pfrag->size = PAGE_SIZE;
2215 return true;
2216 }
2217 return false;
2218}
2219EXPORT_SYMBOL(skb_page_frag_refill);
2220
2221bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2222{
2223 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2224 return true;
2225
2226 sk_enter_memory_pressure(sk);
2227 sk_stream_moderate_sndbuf(sk);
2228 return false;
2229}
2230EXPORT_SYMBOL(sk_page_frag_refill);
2231
2232static void __lock_sock(struct sock *sk)
2233 __releases(&sk->sk_lock.slock)
2234 __acquires(&sk->sk_lock.slock)
2235{
2236 DEFINE_WAIT(wait);
2237
2238 for (;;) {
2239 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2240 TASK_UNINTERRUPTIBLE);
2241 spin_unlock_bh(&sk->sk_lock.slock);
2242 schedule();
2243 spin_lock_bh(&sk->sk_lock.slock);
2244 if (!sock_owned_by_user(sk))
2245 break;
2246 }
2247 finish_wait(&sk->sk_lock.wq, &wait);
2248}
2249
2250static void __release_sock(struct sock *sk)
2251 __releases(&sk->sk_lock.slock)
2252 __acquires(&sk->sk_lock.slock)
2253{
2254 struct sk_buff *skb, *next;
2255
2256 while ((skb = sk->sk_backlog.head) != NULL) {
2257 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
2258
2259 spin_unlock_bh(&sk->sk_lock.slock);
2260
2261 do {
2262 next = skb->next;
2263 prefetch(next);
2264 WARN_ON_ONCE(skb_dst_is_noref(skb));
2265 skb->next = NULL;
2266 sk_backlog_rcv(sk, skb);
2267
2268 cond_resched();
2269
2270 skb = next;
2271 } while (skb != NULL);
2272
2273 spin_lock_bh(&sk->sk_lock.slock);
2274 }
2275
2276
2277
2278
2279
2280 sk->sk_backlog.len = 0;
2281}
2282
2283void __sk_flush_backlog(struct sock *sk)
2284{
2285 spin_lock_bh(&sk->sk_lock.slock);
2286 __release_sock(sk);
2287 spin_unlock_bh(&sk->sk_lock.slock);
2288}
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
2302{
2303 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2304 int rc;
2305
2306 add_wait_queue(sk_sleep(sk), &wait);
2307 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2308 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
2309 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2310 remove_wait_queue(sk_sleep(sk), &wait);
2311 return rc;
2312}
2313EXPORT_SYMBOL(sk_wait_data);
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
2325{
2326 struct proto *prot = sk->sk_prot;
2327 long allocated = sk_memory_allocated_add(sk, amt);
2328
2329 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2330 !mem_cgroup_charge_skmem(sk->sk_memcg, amt))
2331 goto suppress_allocation;
2332
2333
2334 if (allocated <= sk_prot_mem_limits(sk, 0)) {
2335 sk_leave_memory_pressure(sk);
2336 return 1;
2337 }
2338
2339
2340 if (allocated > sk_prot_mem_limits(sk, 1))
2341 sk_enter_memory_pressure(sk);
2342
2343
2344 if (allocated > sk_prot_mem_limits(sk, 2))
2345 goto suppress_allocation;
2346
2347
2348 if (kind == SK_MEM_RECV) {
2349 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2350 return 1;
2351
2352 } else {
2353 if (sk->sk_type == SOCK_STREAM) {
2354 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2355 return 1;
2356 } else if (refcount_read(&sk->sk_wmem_alloc) <
2357 prot->sysctl_wmem[0])
2358 return 1;
2359 }
2360
2361 if (sk_has_memory_pressure(sk)) {
2362 int alloc;
2363
2364 if (!sk_under_memory_pressure(sk))
2365 return 1;
2366 alloc = sk_sockets_allocated_read_positive(sk);
2367 if (sk_prot_mem_limits(sk, 2) > alloc *
2368 sk_mem_pages(sk->sk_wmem_queued +
2369 atomic_read(&sk->sk_rmem_alloc) +
2370 sk->sk_forward_alloc))
2371 return 1;
2372 }
2373
2374suppress_allocation:
2375
2376 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2377 sk_stream_moderate_sndbuf(sk);
2378
2379
2380
2381
2382 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2383 return 1;
2384 }
2385
2386 trace_sock_exceed_buf_limit(sk, prot, allocated);
2387
2388 sk_memory_allocated_sub(sk, amt);
2389
2390 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2391 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
2392
2393 return 0;
2394}
2395EXPORT_SYMBOL(__sk_mem_raise_allocated);
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407int __sk_mem_schedule(struct sock *sk, int size, int kind)
2408{
2409 int ret, amt = sk_mem_pages(size);
2410
2411 sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT;
2412 ret = __sk_mem_raise_allocated(sk, size, amt, kind);
2413 if (!ret)
2414 sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT;
2415 return ret;
2416}
2417EXPORT_SYMBOL(__sk_mem_schedule);
2418
2419
2420
2421
2422
2423
2424
2425
2426void __sk_mem_reduce_allocated(struct sock *sk, int amount)
2427{
2428 sk_memory_allocated_sub(sk, amount);
2429
2430 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2431 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
2432
2433 if (sk_under_memory_pressure(sk) &&
2434 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2435 sk_leave_memory_pressure(sk);
2436}
2437EXPORT_SYMBOL(__sk_mem_reduce_allocated);
2438
2439
2440
2441
2442
2443
2444void __sk_mem_reclaim(struct sock *sk, int amount)
2445{
2446 amount >>= SK_MEM_QUANTUM_SHIFT;
2447 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
2448 __sk_mem_reduce_allocated(sk, amount);
2449}
2450EXPORT_SYMBOL(__sk_mem_reclaim);
2451
2452int sk_set_peek_off(struct sock *sk, int val)
2453{
2454 sk->sk_peek_off = val;
2455 return 0;
2456}
2457EXPORT_SYMBOL_GPL(sk_set_peek_off);
2458
2459
2460
2461
2462
2463
2464
2465
2466int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2467{
2468 return -EOPNOTSUPP;
2469}
2470EXPORT_SYMBOL(sock_no_bind);
2471
2472int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
2473 int len, int flags)
2474{
2475 return -EOPNOTSUPP;
2476}
2477EXPORT_SYMBOL(sock_no_connect);
2478
2479int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2480{
2481 return -EOPNOTSUPP;
2482}
2483EXPORT_SYMBOL(sock_no_socketpair);
2484
2485int sock_no_accept(struct socket *sock, struct socket *newsock, int flags,
2486 bool kern)
2487{
2488 return -EOPNOTSUPP;
2489}
2490EXPORT_SYMBOL(sock_no_accept);
2491
2492int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
2493 int *len, int peer)
2494{
2495 return -EOPNOTSUPP;
2496}
2497EXPORT_SYMBOL(sock_no_getname);
2498
2499unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
2500{
2501 return 0;
2502}
2503EXPORT_SYMBOL(sock_no_poll);
2504
2505int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2506{
2507 return -EOPNOTSUPP;
2508}
2509EXPORT_SYMBOL(sock_no_ioctl);
2510
2511int sock_no_listen(struct socket *sock, int backlog)
2512{
2513 return -EOPNOTSUPP;
2514}
2515EXPORT_SYMBOL(sock_no_listen);
2516
2517int sock_no_shutdown(struct socket *sock, int how)
2518{
2519 return -EOPNOTSUPP;
2520}
2521EXPORT_SYMBOL(sock_no_shutdown);
2522
2523int sock_no_setsockopt(struct socket *sock, int level, int optname,
2524 char __user *optval, unsigned int optlen)
2525{
2526 return -EOPNOTSUPP;
2527}
2528EXPORT_SYMBOL(sock_no_setsockopt);
2529
2530int sock_no_getsockopt(struct socket *sock, int level, int optname,
2531 char __user *optval, int __user *optlen)
2532{
2533 return -EOPNOTSUPP;
2534}
2535EXPORT_SYMBOL(sock_no_getsockopt);
2536
2537int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
2538{
2539 return -EOPNOTSUPP;
2540}
2541EXPORT_SYMBOL(sock_no_sendmsg);
2542
2543int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len)
2544{
2545 return -EOPNOTSUPP;
2546}
2547EXPORT_SYMBOL(sock_no_sendmsg_locked);
2548
2549int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2550 int flags)
2551{
2552 return -EOPNOTSUPP;
2553}
2554EXPORT_SYMBOL(sock_no_recvmsg);
2555
2556int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2557{
2558
2559 return -ENODEV;
2560}
2561EXPORT_SYMBOL(sock_no_mmap);
2562
2563ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2564{
2565 ssize_t res;
2566 struct msghdr msg = {.msg_flags = flags};
2567 struct kvec iov;
2568 char *kaddr = kmap(page);
2569 iov.iov_base = kaddr + offset;
2570 iov.iov_len = size;
2571 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2572 kunmap(page);
2573 return res;
2574}
2575EXPORT_SYMBOL(sock_no_sendpage);
2576
2577ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page,
2578 int offset, size_t size, int flags)
2579{
2580 ssize_t res;
2581 struct msghdr msg = {.msg_flags = flags};
2582 struct kvec iov;
2583 char *kaddr = kmap(page);
2584
2585 iov.iov_base = kaddr + offset;
2586 iov.iov_len = size;
2587 res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size);
2588 kunmap(page);
2589 return res;
2590}
2591EXPORT_SYMBOL(sock_no_sendpage_locked);
2592
2593
2594
2595
2596
2597static void sock_def_wakeup(struct sock *sk)
2598{
2599 struct socket_wq *wq;
2600
2601 rcu_read_lock();
2602 wq = rcu_dereference(sk->sk_wq);
2603 if (skwq_has_sleeper(wq))
2604 wake_up_interruptible_all(&wq->wait);
2605 rcu_read_unlock();
2606}
2607
2608static void sock_def_error_report(struct sock *sk)
2609{
2610 struct socket_wq *wq;
2611
2612 rcu_read_lock();
2613 wq = rcu_dereference(sk->sk_wq);
2614 if (skwq_has_sleeper(wq))
2615 wake_up_interruptible_poll(&wq->wait, POLLERR);
2616 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2617 rcu_read_unlock();
2618}
2619
2620static void sock_def_readable(struct sock *sk)
2621{
2622 struct socket_wq *wq;
2623
2624 rcu_read_lock();
2625 wq = rcu_dereference(sk->sk_wq);
2626 if (skwq_has_sleeper(wq))
2627 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
2628 POLLRDNORM | POLLRDBAND);
2629 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2630 rcu_read_unlock();
2631}
2632
2633static void sock_def_write_space(struct sock *sk)
2634{
2635 struct socket_wq *wq;
2636
2637 rcu_read_lock();
2638
2639
2640
2641
2642 if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
2643 wq = rcu_dereference(sk->sk_wq);
2644 if (skwq_has_sleeper(wq))
2645 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
2646 POLLWRNORM | POLLWRBAND);
2647
2648
2649 if (sock_writeable(sk))
2650 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2651 }
2652
2653 rcu_read_unlock();
2654}
2655
2656static void sock_def_destruct(struct sock *sk)
2657{
2658}
2659
2660void sk_send_sigurg(struct sock *sk)
2661{
2662 if (sk->sk_socket && sk->sk_socket->file)
2663 if (send_sigurg(&sk->sk_socket->file->f_owner))
2664 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2665}
2666EXPORT_SYMBOL(sk_send_sigurg);
2667
2668void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2669 unsigned long expires)
2670{
2671 if (!mod_timer(timer, expires))
2672 sock_hold(sk);
2673}
2674EXPORT_SYMBOL(sk_reset_timer);
2675
2676void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2677{
2678 if (del_timer(timer))
2679 __sock_put(sk);
2680}
2681EXPORT_SYMBOL(sk_stop_timer);
2682
2683void sock_init_data(struct socket *sock, struct sock *sk)
2684{
2685 sk_init_common(sk);
2686 sk->sk_send_head = NULL;
2687
2688 init_timer(&sk->sk_timer);
2689
2690 sk->sk_allocation = GFP_KERNEL;
2691 sk->sk_rcvbuf = sysctl_rmem_default;
2692 sk->sk_sndbuf = sysctl_wmem_default;
2693 sk->sk_state = TCP_CLOSE;
2694 sk_set_socket(sk, sock);
2695
2696 sock_set_flag(sk, SOCK_ZAPPED);
2697
2698 if (sock) {
2699 sk->sk_type = sock->type;
2700 sk->sk_wq = sock->wq;
2701 sock->sk = sk;
2702 sk->sk_uid = SOCK_INODE(sock)->i_uid;
2703 } else {
2704 sk->sk_wq = NULL;
2705 sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0);
2706 }
2707
2708 rwlock_init(&sk->sk_callback_lock);
2709 if (sk->sk_kern_sock)
2710 lockdep_set_class_and_name(
2711 &sk->sk_callback_lock,
2712 af_kern_callback_keys + sk->sk_family,
2713 af_family_kern_clock_key_strings[sk->sk_family]);
2714 else
2715 lockdep_set_class_and_name(
2716 &sk->sk_callback_lock,
2717 af_callback_keys + sk->sk_family,
2718 af_family_clock_key_strings[sk->sk_family]);
2719
2720 sk->sk_state_change = sock_def_wakeup;
2721 sk->sk_data_ready = sock_def_readable;
2722 sk->sk_write_space = sock_def_write_space;
2723 sk->sk_error_report = sock_def_error_report;
2724 sk->sk_destruct = sock_def_destruct;
2725
2726 sk->sk_frag.page = NULL;
2727 sk->sk_frag.offset = 0;
2728 sk->sk_peek_off = -1;
2729
2730 sk->sk_peer_pid = NULL;
2731 sk->sk_peer_cred = NULL;
2732 sk->sk_write_pending = 0;
2733 sk->sk_rcvlowat = 1;
2734 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2735 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2736
2737 sk->sk_stamp = SK_DEFAULT_STAMP;
2738 atomic_set(&sk->sk_zckey, 0);
2739
2740#ifdef CONFIG_NET_RX_BUSY_POLL
2741 sk->sk_napi_id = 0;
2742 sk->sk_ll_usec = sysctl_net_busy_read;
2743#endif
2744
2745 sk->sk_max_pacing_rate = ~0U;
2746 sk->sk_pacing_rate = ~0U;
2747 sk->sk_incoming_cpu = -1;
2748
2749
2750
2751
2752 smp_wmb();
2753 refcount_set(&sk->sk_refcnt, 1);
2754 atomic_set(&sk->sk_drops, 0);
2755}
2756EXPORT_SYMBOL(sock_init_data);
2757
2758void lock_sock_nested(struct sock *sk, int subclass)
2759{
2760 might_sleep();
2761 spin_lock_bh(&sk->sk_lock.slock);
2762 if (sk->sk_lock.owned)
2763 __lock_sock(sk);
2764 sk->sk_lock.owned = 1;
2765 spin_unlock(&sk->sk_lock.slock);
2766
2767
2768
2769 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2770 local_bh_enable();
2771}
2772EXPORT_SYMBOL(lock_sock_nested);
2773
2774void release_sock(struct sock *sk)
2775{
2776 spin_lock_bh(&sk->sk_lock.slock);
2777 if (sk->sk_backlog.tail)
2778 __release_sock(sk);
2779
2780
2781
2782
2783 if (sk->sk_prot->release_cb)
2784 sk->sk_prot->release_cb(sk);
2785
2786 sock_release_ownership(sk);
2787 if (waitqueue_active(&sk->sk_lock.wq))
2788 wake_up(&sk->sk_lock.wq);
2789 spin_unlock_bh(&sk->sk_lock.slock);
2790}
2791EXPORT_SYMBOL(release_sock);
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806bool lock_sock_fast(struct sock *sk)
2807{
2808 might_sleep();
2809 spin_lock_bh(&sk->sk_lock.slock);
2810
2811 if (!sk->sk_lock.owned)
2812
2813
2814
2815 return false;
2816
2817 __lock_sock(sk);
2818 sk->sk_lock.owned = 1;
2819 spin_unlock(&sk->sk_lock.slock);
2820
2821
2822
2823 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2824 local_bh_enable();
2825 return true;
2826}
2827EXPORT_SYMBOL(lock_sock_fast);
2828
2829int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2830{
2831 struct timeval tv;
2832 if (!sock_flag(sk, SOCK_TIMESTAMP))
2833 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2834 tv = ktime_to_timeval(sk->sk_stamp);
2835 if (tv.tv_sec == -1)
2836 return -ENOENT;
2837 if (tv.tv_sec == 0) {
2838 sk->sk_stamp = ktime_get_real();
2839 tv = ktime_to_timeval(sk->sk_stamp);
2840 }
2841 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
2842}
2843EXPORT_SYMBOL(sock_get_timestamp);
2844
2845int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2846{
2847 struct timespec ts;
2848 if (!sock_flag(sk, SOCK_TIMESTAMP))
2849 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2850 ts = ktime_to_timespec(sk->sk_stamp);
2851 if (ts.tv_sec == -1)
2852 return -ENOENT;
2853 if (ts.tv_sec == 0) {
2854 sk->sk_stamp = ktime_get_real();
2855 ts = ktime_to_timespec(sk->sk_stamp);
2856 }
2857 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2858}
2859EXPORT_SYMBOL(sock_get_timestampns);
2860
2861void sock_enable_timestamp(struct sock *sk, int flag)
2862{
2863 if (!sock_flag(sk, flag)) {
2864 unsigned long previous_flags = sk->sk_flags;
2865
2866 sock_set_flag(sk, flag);
2867
2868
2869
2870
2871
2872 if (sock_needs_netstamp(sk) &&
2873 !(previous_flags & SK_FLAGS_TIMESTAMP))
2874 net_enable_timestamp();
2875 }
2876}
2877
2878int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2879 int level, int type)
2880{
2881 struct sock_exterr_skb *serr;
2882 struct sk_buff *skb;
2883 int copied, err;
2884
2885 err = -EAGAIN;
2886 skb = sock_dequeue_err_skb(sk);
2887 if (skb == NULL)
2888 goto out;
2889
2890 copied = skb->len;
2891 if (copied > len) {
2892 msg->msg_flags |= MSG_TRUNC;
2893 copied = len;
2894 }
2895 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2896 if (err)
2897 goto out_free_skb;
2898
2899 sock_recv_timestamp(msg, sk, skb);
2900
2901 serr = SKB_EXT_ERR(skb);
2902 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2903
2904 msg->msg_flags |= MSG_ERRQUEUE;
2905 err = copied;
2906
2907out_free_skb:
2908 kfree_skb(skb);
2909out:
2910 return err;
2911}
2912EXPORT_SYMBOL(sock_recv_errqueue);
2913
2914
2915
2916
2917
2918
2919
2920
2921int sock_common_getsockopt(struct socket *sock, int level, int optname,
2922 char __user *optval, int __user *optlen)
2923{
2924 struct sock *sk = sock->sk;
2925
2926 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2927}
2928EXPORT_SYMBOL(sock_common_getsockopt);
2929
2930#ifdef CONFIG_COMPAT
2931int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2932 char __user *optval, int __user *optlen)
2933{
2934 struct sock *sk = sock->sk;
2935
2936 if (sk->sk_prot->compat_getsockopt != NULL)
2937 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2938 optval, optlen);
2939 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2940}
2941EXPORT_SYMBOL(compat_sock_common_getsockopt);
2942#endif
2943
2944int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2945 int flags)
2946{
2947 struct sock *sk = sock->sk;
2948 int addr_len = 0;
2949 int err;
2950
2951 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
2952 flags & ~MSG_DONTWAIT, &addr_len);
2953 if (err >= 0)
2954 msg->msg_namelen = addr_len;
2955 return err;
2956}
2957EXPORT_SYMBOL(sock_common_recvmsg);
2958
2959
2960
2961
2962int sock_common_setsockopt(struct socket *sock, int level, int optname,
2963 char __user *optval, unsigned int optlen)
2964{
2965 struct sock *sk = sock->sk;
2966
2967 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2968}
2969EXPORT_SYMBOL(sock_common_setsockopt);
2970
2971#ifdef CONFIG_COMPAT
2972int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2973 char __user *optval, unsigned int optlen)
2974{
2975 struct sock *sk = sock->sk;
2976
2977 if (sk->sk_prot->compat_setsockopt != NULL)
2978 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2979 optval, optlen);
2980 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2981}
2982EXPORT_SYMBOL(compat_sock_common_setsockopt);
2983#endif
2984
2985void sk_common_release(struct sock *sk)
2986{
2987 if (sk->sk_prot->destroy)
2988 sk->sk_prot->destroy(sk);
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998 sk->sk_prot->unhash(sk);
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012 sock_orphan(sk);
3013
3014 xfrm_sk_free_policy(sk);
3015
3016 sk_refcnt_debug_release(sk);
3017
3018 sock_put(sk);
3019}
3020EXPORT_SYMBOL(sk_common_release);
3021
3022void sk_get_meminfo(const struct sock *sk, u32 *mem)
3023{
3024 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
3025
3026 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
3027 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
3028 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
3029 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
3030 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
3031 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
3032 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
3033 mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
3034 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
3035}
3036
3037#ifdef CONFIG_PROC_FS
3038#define PROTO_INUSE_NR 64
3039struct prot_inuse {
3040 int val[PROTO_INUSE_NR];
3041};
3042
3043static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
3044
3045#ifdef CONFIG_NET_NS
3046void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
3047{
3048 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
3049}
3050EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
3051
3052int sock_prot_inuse_get(struct net *net, struct proto *prot)
3053{
3054 int cpu, idx = prot->inuse_idx;
3055 int res = 0;
3056
3057 for_each_possible_cpu(cpu)
3058 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
3059
3060 return res >= 0 ? res : 0;
3061}
3062EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
3063
3064static int __net_init sock_inuse_init_net(struct net *net)
3065{
3066 net->core.inuse = alloc_percpu(struct prot_inuse);
3067 return net->core.inuse ? 0 : -ENOMEM;
3068}
3069
3070static void __net_exit sock_inuse_exit_net(struct net *net)
3071{
3072 free_percpu(net->core.inuse);
3073}
3074
3075static struct pernet_operations net_inuse_ops = {
3076 .init = sock_inuse_init_net,
3077 .exit = sock_inuse_exit_net,
3078};
3079
3080static __init int net_inuse_init(void)
3081{
3082 if (register_pernet_subsys(&net_inuse_ops))
3083 panic("Cannot initialize net inuse counters");
3084
3085 return 0;
3086}
3087
3088core_initcall(net_inuse_init);
3089#else
3090static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
3091
3092void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
3093{
3094 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
3095}
3096EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
3097
3098int sock_prot_inuse_get(struct net *net, struct proto *prot)
3099{
3100 int cpu, idx = prot->inuse_idx;
3101 int res = 0;
3102
3103 for_each_possible_cpu(cpu)
3104 res += per_cpu(prot_inuse, cpu).val[idx];
3105
3106 return res >= 0 ? res : 0;
3107}
3108EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
3109#endif
3110
3111static void assign_proto_idx(struct proto *prot)
3112{
3113 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
3114
3115 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
3116 pr_err("PROTO_INUSE_NR exhausted\n");
3117 return;
3118 }
3119
3120 set_bit(prot->inuse_idx, proto_inuse_idx);
3121}
3122
3123static void release_proto_idx(struct proto *prot)
3124{
3125 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
3126 clear_bit(prot->inuse_idx, proto_inuse_idx);
3127}
3128#else
3129static inline void assign_proto_idx(struct proto *prot)
3130{
3131}
3132
3133static inline void release_proto_idx(struct proto *prot)
3134{
3135}
3136#endif
3137
3138static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
3139{
3140 if (!rsk_prot)
3141 return;
3142 kfree(rsk_prot->slab_name);
3143 rsk_prot->slab_name = NULL;
3144 kmem_cache_destroy(rsk_prot->slab);
3145 rsk_prot->slab = NULL;
3146}
3147
3148static int req_prot_init(const struct proto *prot)
3149{
3150 struct request_sock_ops *rsk_prot = prot->rsk_prot;
3151
3152 if (!rsk_prot)
3153 return 0;
3154
3155 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
3156 prot->name);
3157 if (!rsk_prot->slab_name)
3158 return -ENOMEM;
3159
3160 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
3161 rsk_prot->obj_size, 0,
3162 prot->slab_flags, NULL);
3163
3164 if (!rsk_prot->slab) {
3165 pr_crit("%s: Can't create request sock SLAB cache!\n",
3166 prot->name);
3167 return -ENOMEM;
3168 }
3169 return 0;
3170}
3171
3172int proto_register(struct proto *prot, int alloc_slab)
3173{
3174 if (alloc_slab) {
3175 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
3176 SLAB_HWCACHE_ALIGN | prot->slab_flags,
3177 NULL);
3178
3179 if (prot->slab == NULL) {
3180 pr_crit("%s: Can't create sock SLAB cache!\n",
3181 prot->name);
3182 goto out;
3183 }
3184
3185 if (req_prot_init(prot))
3186 goto out_free_request_sock_slab;
3187
3188 if (prot->twsk_prot != NULL) {
3189 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
3190
3191 if (prot->twsk_prot->twsk_slab_name == NULL)
3192 goto out_free_request_sock_slab;
3193
3194 prot->twsk_prot->twsk_slab =
3195 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
3196 prot->twsk_prot->twsk_obj_size,
3197 0,
3198 prot->slab_flags,
3199 NULL);
3200 if (prot->twsk_prot->twsk_slab == NULL)
3201 goto out_free_timewait_sock_slab_name;
3202 }
3203 }
3204
3205 mutex_lock(&proto_list_mutex);
3206 list_add(&prot->node, &proto_list);
3207 assign_proto_idx(prot);
3208 mutex_unlock(&proto_list_mutex);
3209 return 0;
3210
3211out_free_timewait_sock_slab_name:
3212 kfree(prot->twsk_prot->twsk_slab_name);
3213out_free_request_sock_slab:
3214 req_prot_cleanup(prot->rsk_prot);
3215
3216 kmem_cache_destroy(prot->slab);
3217 prot->slab = NULL;
3218out:
3219 return -ENOBUFS;
3220}
3221EXPORT_SYMBOL(proto_register);
3222
3223void proto_unregister(struct proto *prot)
3224{
3225 mutex_lock(&proto_list_mutex);
3226 release_proto_idx(prot);
3227 list_del(&prot->node);
3228 mutex_unlock(&proto_list_mutex);
3229
3230 kmem_cache_destroy(prot->slab);
3231 prot->slab = NULL;
3232
3233 req_prot_cleanup(prot->rsk_prot);
3234
3235 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
3236 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
3237 kfree(prot->twsk_prot->twsk_slab_name);
3238 prot->twsk_prot->twsk_slab = NULL;
3239 }
3240}
3241EXPORT_SYMBOL(proto_unregister);
3242
3243#ifdef CONFIG_PROC_FS
3244static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
3245 __acquires(proto_list_mutex)
3246{
3247 mutex_lock(&proto_list_mutex);
3248 return seq_list_start_head(&proto_list, *pos);
3249}
3250
3251static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3252{
3253 return seq_list_next(v, &proto_list, pos);
3254}
3255
3256static void proto_seq_stop(struct seq_file *seq, void *v)
3257 __releases(proto_list_mutex)
3258{
3259 mutex_unlock(&proto_list_mutex);
3260}
3261
3262static char proto_method_implemented(const void *method)
3263{
3264 return method == NULL ? 'n' : 'y';
3265}
3266static long sock_prot_memory_allocated(struct proto *proto)
3267{
3268 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
3269}
3270
3271static char *sock_prot_memory_pressure(struct proto *proto)
3272{
3273 return proto->memory_pressure != NULL ?
3274 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
3275}
3276
3277static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
3278{
3279
3280 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
3281 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3282 proto->name,
3283 proto->obj_size,
3284 sock_prot_inuse_get(seq_file_net(seq), proto),
3285 sock_prot_memory_allocated(proto),
3286 sock_prot_memory_pressure(proto),
3287 proto->max_header,
3288 proto->slab == NULL ? "no" : "yes",
3289 module_name(proto->owner),
3290 proto_method_implemented(proto->close),
3291 proto_method_implemented(proto->connect),
3292 proto_method_implemented(proto->disconnect),
3293 proto_method_implemented(proto->accept),
3294 proto_method_implemented(proto->ioctl),
3295 proto_method_implemented(proto->init),
3296 proto_method_implemented(proto->destroy),
3297 proto_method_implemented(proto->shutdown),
3298 proto_method_implemented(proto->setsockopt),
3299 proto_method_implemented(proto->getsockopt),
3300 proto_method_implemented(proto->sendmsg),
3301 proto_method_implemented(proto->recvmsg),
3302 proto_method_implemented(proto->sendpage),
3303 proto_method_implemented(proto->bind),
3304 proto_method_implemented(proto->backlog_rcv),
3305 proto_method_implemented(proto->hash),
3306 proto_method_implemented(proto->unhash),
3307 proto_method_implemented(proto->get_port),
3308 proto_method_implemented(proto->enter_memory_pressure));
3309}
3310
3311static int proto_seq_show(struct seq_file *seq, void *v)
3312{
3313 if (v == &proto_list)
3314 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3315 "protocol",
3316 "size",
3317 "sockets",
3318 "memory",
3319 "press",
3320 "maxhdr",
3321 "slab",
3322 "module",
3323 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3324 else
3325 proto_seq_printf(seq, list_entry(v, struct proto, node));
3326 return 0;
3327}
3328
3329static const struct seq_operations proto_seq_ops = {
3330 .start = proto_seq_start,
3331 .next = proto_seq_next,
3332 .stop = proto_seq_stop,
3333 .show = proto_seq_show,
3334};
3335
3336static int proto_seq_open(struct inode *inode, struct file *file)
3337{
3338 return seq_open_net(inode, file, &proto_seq_ops,
3339 sizeof(struct seq_net_private));
3340}
3341
3342static const struct file_operations proto_seq_fops = {
3343 .owner = THIS_MODULE,
3344 .open = proto_seq_open,
3345 .read = seq_read,
3346 .llseek = seq_lseek,
3347 .release = seq_release_net,
3348};
3349
3350static __net_init int proto_init_net(struct net *net)
3351{
3352 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
3353 return -ENOMEM;
3354
3355 return 0;
3356}
3357
3358static __net_exit void proto_exit_net(struct net *net)
3359{
3360 remove_proc_entry("protocols", net->proc_net);
3361}
3362
3363
3364static __net_initdata struct pernet_operations proto_net_ops = {
3365 .init = proto_init_net,
3366 .exit = proto_exit_net,
3367};
3368
3369static int __init proto_init(void)
3370{
3371 return register_pernet_subsys(&proto_net_ops);
3372}
3373
3374subsys_initcall(proto_init);
3375
3376#endif
3377
3378#ifdef CONFIG_NET_RX_BUSY_POLL
3379bool sk_busy_loop_end(void *p, unsigned long start_time)
3380{
3381 struct sock *sk = p;
3382
3383 return !skb_queue_empty(&sk->sk_receive_queue) ||
3384 sk_busy_loop_timeout(sk, start_time);
3385}
3386EXPORT_SYMBOL(sk_busy_loop_end);
3387#endif
3388