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92#include <linux/capability.h>
93#include <linux/errno.h>
94#include <linux/types.h>
95#include <linux/socket.h>
96#include <linux/in.h>
97#include <linux/kernel.h>
98#include <linux/module.h>
99#include <linux/proc_fs.h>
100#include <linux/seq_file.h>
101#include <linux/sched.h>
102#include <linux/timer.h>
103#include <linux/string.h>
104#include <linux/sockios.h>
105#include <linux/net.h>
106#include <linux/mm.h>
107#include <linux/slab.h>
108#include <linux/interrupt.h>
109#include <linux/poll.h>
110#include <linux/tcp.h>
111#include <linux/init.h>
112#include <linux/highmem.h>
113#include <linux/user_namespace.h>
114
115#include <asm/uaccess.h>
116#include <asm/system.h>
117
118#include <linux/netdevice.h>
119#include <net/protocol.h>
120#include <linux/skbuff.h>
121#include <net/net_namespace.h>
122#include <net/request_sock.h>
123#include <net/sock.h>
124#include <linux/net_tstamp.h>
125#include <net/xfrm.h>
126#include <linux/ipsec.h>
127#include <net/cls_cgroup.h>
128
129#include <linux/filter.h>
130
131#ifdef CONFIG_INET
132#include <net/tcp.h>
133#endif
134
135
136
137
138
139static struct lock_class_key af_family_keys[AF_MAX];
140static struct lock_class_key af_family_slock_keys[AF_MAX];
141
142
143
144
145
146
147static const char *const af_family_key_strings[AF_MAX+1] = {
148 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
149 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
150 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
151 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
152 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
153 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
154 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
155 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
156 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
157 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
158 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
159 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
160 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
161 "sk_lock-AF_MAX"
162};
163static const char *const af_family_slock_key_strings[AF_MAX+1] = {
164 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
165 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
166 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
167 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
168 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
169 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
170 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
171 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
172 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
173 "slock-27" , "slock-28" , "slock-AF_CAN" ,
174 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
175 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
176 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
177 "slock-AF_MAX"
178};
179static const char *const af_family_clock_key_strings[AF_MAX+1] = {
180 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
181 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
182 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
183 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
184 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
185 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
186 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
187 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
188 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
189 "clock-27" , "clock-28" , "clock-AF_CAN" ,
190 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
191 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
192 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
193 "clock-AF_MAX"
194};
195
196
197
198
199
200static struct lock_class_key af_callback_keys[AF_MAX];
201
202
203
204
205
206
207#define _SK_MEM_PACKETS 256
208#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
209#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
210#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
211
212
213__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
214__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
215__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
216__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
217
218
219int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
220EXPORT_SYMBOL(sysctl_optmem_max);
221
222#if defined(CONFIG_CGROUPS) && !defined(CONFIG_NET_CLS_CGROUP)
223int net_cls_subsys_id = -1;
224EXPORT_SYMBOL_GPL(net_cls_subsys_id);
225#endif
226
227static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
228{
229 struct timeval tv;
230
231 if (optlen < sizeof(tv))
232 return -EINVAL;
233 if (copy_from_user(&tv, optval, sizeof(tv)))
234 return -EFAULT;
235 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
236 return -EDOM;
237
238 if (tv.tv_sec < 0) {
239 static int warned __read_mostly;
240
241 *timeo_p = 0;
242 if (warned < 10 && net_ratelimit()) {
243 warned++;
244 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
245 "tries to set negative timeout\n",
246 current->comm, task_pid_nr(current));
247 }
248 return 0;
249 }
250 *timeo_p = MAX_SCHEDULE_TIMEOUT;
251 if (tv.tv_sec == 0 && tv.tv_usec == 0)
252 return 0;
253 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
254 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
255 return 0;
256}
257
258static void sock_warn_obsolete_bsdism(const char *name)
259{
260 static int warned;
261 static char warncomm[TASK_COMM_LEN];
262 if (strcmp(warncomm, current->comm) && warned < 5) {
263 strcpy(warncomm, current->comm);
264 printk(KERN_WARNING "process `%s' is using obsolete "
265 "%s SO_BSDCOMPAT\n", warncomm, name);
266 warned++;
267 }
268}
269
270static void sock_disable_timestamp(struct sock *sk, int flag)
271{
272 if (sock_flag(sk, flag)) {
273 sock_reset_flag(sk, flag);
274 if (!sock_flag(sk, SOCK_TIMESTAMP) &&
275 !sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) {
276 net_disable_timestamp();
277 }
278 }
279}
280
281
282int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
283{
284 int err;
285 int skb_len;
286 unsigned long flags;
287 struct sk_buff_head *list = &sk->sk_receive_queue;
288
289
290
291
292 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
293 (unsigned)sk->sk_rcvbuf) {
294 atomic_inc(&sk->sk_drops);
295 return -ENOMEM;
296 }
297
298 err = sk_filter(sk, skb);
299 if (err)
300 return err;
301
302 if (!sk_rmem_schedule(sk, skb->truesize)) {
303 atomic_inc(&sk->sk_drops);
304 return -ENOBUFS;
305 }
306
307 skb->dev = NULL;
308 skb_set_owner_r(skb, sk);
309
310
311
312
313
314
315 skb_len = skb->len;
316
317
318
319
320 skb_dst_force(skb);
321
322 spin_lock_irqsave(&list->lock, flags);
323 skb->dropcount = atomic_read(&sk->sk_drops);
324 __skb_queue_tail(list, skb);
325 spin_unlock_irqrestore(&list->lock, flags);
326
327 if (!sock_flag(sk, SOCK_DEAD))
328 sk->sk_data_ready(sk, skb_len);
329 return 0;
330}
331EXPORT_SYMBOL(sock_queue_rcv_skb);
332
333int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
334{
335 int rc = NET_RX_SUCCESS;
336
337 if (sk_filter(sk, skb))
338 goto discard_and_relse;
339
340 skb->dev = NULL;
341
342 if (sk_rcvqueues_full(sk, skb)) {
343 atomic_inc(&sk->sk_drops);
344 goto discard_and_relse;
345 }
346 if (nested)
347 bh_lock_sock_nested(sk);
348 else
349 bh_lock_sock(sk);
350 if (!sock_owned_by_user(sk)) {
351
352
353
354 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
355
356 rc = sk_backlog_rcv(sk, skb);
357
358 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
359 } else if (sk_add_backlog(sk, skb)) {
360 bh_unlock_sock(sk);
361 atomic_inc(&sk->sk_drops);
362 goto discard_and_relse;
363 }
364
365 bh_unlock_sock(sk);
366out:
367 sock_put(sk);
368 return rc;
369discard_and_relse:
370 kfree_skb(skb);
371 goto out;
372}
373EXPORT_SYMBOL(sk_receive_skb);
374
375void sk_reset_txq(struct sock *sk)
376{
377 sk_tx_queue_clear(sk);
378}
379EXPORT_SYMBOL(sk_reset_txq);
380
381struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
382{
383 struct dst_entry *dst = __sk_dst_get(sk);
384
385 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
386 sk_tx_queue_clear(sk);
387 rcu_assign_pointer(sk->sk_dst_cache, NULL);
388 dst_release(dst);
389 return NULL;
390 }
391
392 return dst;
393}
394EXPORT_SYMBOL(__sk_dst_check);
395
396struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
397{
398 struct dst_entry *dst = sk_dst_get(sk);
399
400 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
401 sk_dst_reset(sk);
402 dst_release(dst);
403 return NULL;
404 }
405
406 return dst;
407}
408EXPORT_SYMBOL(sk_dst_check);
409
410static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
411{
412 int ret = -ENOPROTOOPT;
413#ifdef CONFIG_NETDEVICES
414 struct net *net = sock_net(sk);
415 char devname[IFNAMSIZ];
416 int index;
417
418
419 ret = -EPERM;
420 if (!capable(CAP_NET_RAW))
421 goto out;
422
423 ret = -EINVAL;
424 if (optlen < 0)
425 goto out;
426
427
428
429
430
431
432 if (optlen > IFNAMSIZ - 1)
433 optlen = IFNAMSIZ - 1;
434 memset(devname, 0, sizeof(devname));
435
436 ret = -EFAULT;
437 if (copy_from_user(devname, optval, optlen))
438 goto out;
439
440 index = 0;
441 if (devname[0] != '\0') {
442 struct net_device *dev;
443
444 rcu_read_lock();
445 dev = dev_get_by_name_rcu(net, devname);
446 if (dev)
447 index = dev->ifindex;
448 rcu_read_unlock();
449 ret = -ENODEV;
450 if (!dev)
451 goto out;
452 }
453
454 lock_sock(sk);
455 sk->sk_bound_dev_if = index;
456 sk_dst_reset(sk);
457 release_sock(sk);
458
459 ret = 0;
460
461out:
462#endif
463
464 return ret;
465}
466
467static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
468{
469 if (valbool)
470 sock_set_flag(sk, bit);
471 else
472 sock_reset_flag(sk, bit);
473}
474
475
476
477
478
479
480int sock_setsockopt(struct socket *sock, int level, int optname,
481 char __user *optval, unsigned int optlen)
482{
483 struct sock *sk = sock->sk;
484 int val;
485 int valbool;
486 struct linger ling;
487 int ret = 0;
488
489
490
491
492
493 if (optname == SO_BINDTODEVICE)
494 return sock_bindtodevice(sk, optval, optlen);
495
496 if (optlen < sizeof(int))
497 return -EINVAL;
498
499 if (get_user(val, (int __user *)optval))
500 return -EFAULT;
501
502 valbool = val ? 1 : 0;
503
504 lock_sock(sk);
505
506 switch (optname) {
507 case SO_DEBUG:
508 if (val && !capable(CAP_NET_ADMIN))
509 ret = -EACCES;
510 else
511 sock_valbool_flag(sk, SOCK_DBG, valbool);
512 break;
513 case SO_REUSEADDR:
514 sk->sk_reuse = valbool;
515 break;
516 case SO_TYPE:
517 case SO_PROTOCOL:
518 case SO_DOMAIN:
519 case SO_ERROR:
520 ret = -ENOPROTOOPT;
521 break;
522 case SO_DONTROUTE:
523 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
524 break;
525 case SO_BROADCAST:
526 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
527 break;
528 case SO_SNDBUF:
529
530
531
532
533
534 if (val > sysctl_wmem_max)
535 val = sysctl_wmem_max;
536set_sndbuf:
537 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
538 if ((val * 2) < SOCK_MIN_SNDBUF)
539 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
540 else
541 sk->sk_sndbuf = val * 2;
542
543
544
545
546
547 sk->sk_write_space(sk);
548 break;
549
550 case SO_SNDBUFFORCE:
551 if (!capable(CAP_NET_ADMIN)) {
552 ret = -EPERM;
553 break;
554 }
555 goto set_sndbuf;
556
557 case SO_RCVBUF:
558
559
560
561
562
563 if (val > sysctl_rmem_max)
564 val = sysctl_rmem_max;
565set_rcvbuf:
566 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582 if ((val * 2) < SOCK_MIN_RCVBUF)
583 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
584 else
585 sk->sk_rcvbuf = val * 2;
586 break;
587
588 case SO_RCVBUFFORCE:
589 if (!capable(CAP_NET_ADMIN)) {
590 ret = -EPERM;
591 break;
592 }
593 goto set_rcvbuf;
594
595 case SO_KEEPALIVE:
596#ifdef CONFIG_INET
597 if (sk->sk_protocol == IPPROTO_TCP)
598 tcp_set_keepalive(sk, valbool);
599#endif
600 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
601 break;
602
603 case SO_OOBINLINE:
604 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
605 break;
606
607 case SO_NO_CHECK:
608 sk->sk_no_check = valbool;
609 break;
610
611 case SO_PRIORITY:
612 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
613 sk->sk_priority = val;
614 else
615 ret = -EPERM;
616 break;
617
618 case SO_LINGER:
619 if (optlen < sizeof(ling)) {
620 ret = -EINVAL;
621 break;
622 }
623 if (copy_from_user(&ling, optval, sizeof(ling))) {
624 ret = -EFAULT;
625 break;
626 }
627 if (!ling.l_onoff)
628 sock_reset_flag(sk, SOCK_LINGER);
629 else {
630#if (BITS_PER_LONG == 32)
631 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
632 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
633 else
634#endif
635 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
636 sock_set_flag(sk, SOCK_LINGER);
637 }
638 break;
639
640 case SO_BSDCOMPAT:
641 sock_warn_obsolete_bsdism("setsockopt");
642 break;
643
644 case SO_PASSCRED:
645 if (valbool)
646 set_bit(SOCK_PASSCRED, &sock->flags);
647 else
648 clear_bit(SOCK_PASSCRED, &sock->flags);
649 break;
650
651 case SO_TIMESTAMP:
652 case SO_TIMESTAMPNS:
653 if (valbool) {
654 if (optname == SO_TIMESTAMP)
655 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
656 else
657 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
658 sock_set_flag(sk, SOCK_RCVTSTAMP);
659 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
660 } else {
661 sock_reset_flag(sk, SOCK_RCVTSTAMP);
662 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
663 }
664 break;
665
666 case SO_TIMESTAMPING:
667 if (val & ~SOF_TIMESTAMPING_MASK) {
668 ret = -EINVAL;
669 break;
670 }
671 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
672 val & SOF_TIMESTAMPING_TX_HARDWARE);
673 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
674 val & SOF_TIMESTAMPING_TX_SOFTWARE);
675 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
676 val & SOF_TIMESTAMPING_RX_HARDWARE);
677 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
678 sock_enable_timestamp(sk,
679 SOCK_TIMESTAMPING_RX_SOFTWARE);
680 else
681 sock_disable_timestamp(sk,
682 SOCK_TIMESTAMPING_RX_SOFTWARE);
683 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
684 val & SOF_TIMESTAMPING_SOFTWARE);
685 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
686 val & SOF_TIMESTAMPING_SYS_HARDWARE);
687 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
688 val & SOF_TIMESTAMPING_RAW_HARDWARE);
689 break;
690
691 case SO_RCVLOWAT:
692 if (val < 0)
693 val = INT_MAX;
694 sk->sk_rcvlowat = val ? : 1;
695 break;
696
697 case SO_RCVTIMEO:
698 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
699 break;
700
701 case SO_SNDTIMEO:
702 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
703 break;
704
705 case SO_ATTACH_FILTER:
706 ret = -EINVAL;
707 if (optlen == sizeof(struct sock_fprog)) {
708 struct sock_fprog fprog;
709
710 ret = -EFAULT;
711 if (copy_from_user(&fprog, optval, sizeof(fprog)))
712 break;
713
714 ret = sk_attach_filter(&fprog, sk);
715 }
716 break;
717
718 case SO_DETACH_FILTER:
719 ret = sk_detach_filter(sk);
720 break;
721
722 case SO_PASSSEC:
723 if (valbool)
724 set_bit(SOCK_PASSSEC, &sock->flags);
725 else
726 clear_bit(SOCK_PASSSEC, &sock->flags);
727 break;
728 case SO_MARK:
729 if (!capable(CAP_NET_ADMIN))
730 ret = -EPERM;
731 else
732 sk->sk_mark = val;
733 break;
734
735
736
737 case SO_RXQ_OVFL:
738 if (valbool)
739 sock_set_flag(sk, SOCK_RXQ_OVFL);
740 else
741 sock_reset_flag(sk, SOCK_RXQ_OVFL);
742 break;
743 default:
744 ret = -ENOPROTOOPT;
745 break;
746 }
747 release_sock(sk);
748 return ret;
749}
750EXPORT_SYMBOL(sock_setsockopt);
751
752
753void cred_to_ucred(struct pid *pid, const struct cred *cred,
754 struct ucred *ucred)
755{
756 ucred->pid = pid_vnr(pid);
757 ucred->uid = ucred->gid = -1;
758 if (cred) {
759 struct user_namespace *current_ns = current_user_ns();
760
761 ucred->uid = user_ns_map_uid(current_ns, cred, cred->euid);
762 ucred->gid = user_ns_map_gid(current_ns, cred, cred->egid);
763 }
764}
765EXPORT_SYMBOL_GPL(cred_to_ucred);
766
767int sock_getsockopt(struct socket *sock, int level, int optname,
768 char __user *optval, int __user *optlen)
769{
770 struct sock *sk = sock->sk;
771
772 union {
773 int val;
774 struct linger ling;
775 struct timeval tm;
776 } v;
777
778 int lv = sizeof(int);
779 int len;
780
781 if (get_user(len, optlen))
782 return -EFAULT;
783 if (len < 0)
784 return -EINVAL;
785
786 memset(&v, 0, sizeof(v));
787
788 switch (optname) {
789 case SO_DEBUG:
790 v.val = sock_flag(sk, SOCK_DBG);
791 break;
792
793 case SO_DONTROUTE:
794 v.val = sock_flag(sk, SOCK_LOCALROUTE);
795 break;
796
797 case SO_BROADCAST:
798 v.val = !!sock_flag(sk, SOCK_BROADCAST);
799 break;
800
801 case SO_SNDBUF:
802 v.val = sk->sk_sndbuf;
803 break;
804
805 case SO_RCVBUF:
806 v.val = sk->sk_rcvbuf;
807 break;
808
809 case SO_REUSEADDR:
810 v.val = sk->sk_reuse;
811 break;
812
813 case SO_KEEPALIVE:
814 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
815 break;
816
817 case SO_TYPE:
818 v.val = sk->sk_type;
819 break;
820
821 case SO_PROTOCOL:
822 v.val = sk->sk_protocol;
823 break;
824
825 case SO_DOMAIN:
826 v.val = sk->sk_family;
827 break;
828
829 case SO_ERROR:
830 v.val = -sock_error(sk);
831 if (v.val == 0)
832 v.val = xchg(&sk->sk_err_soft, 0);
833 break;
834
835 case SO_OOBINLINE:
836 v.val = !!sock_flag(sk, SOCK_URGINLINE);
837 break;
838
839 case SO_NO_CHECK:
840 v.val = sk->sk_no_check;
841 break;
842
843 case SO_PRIORITY:
844 v.val = sk->sk_priority;
845 break;
846
847 case SO_LINGER:
848 lv = sizeof(v.ling);
849 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
850 v.ling.l_linger = sk->sk_lingertime / HZ;
851 break;
852
853 case SO_BSDCOMPAT:
854 sock_warn_obsolete_bsdism("getsockopt");
855 break;
856
857 case SO_TIMESTAMP:
858 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
859 !sock_flag(sk, SOCK_RCVTSTAMPNS);
860 break;
861
862 case SO_TIMESTAMPNS:
863 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
864 break;
865
866 case SO_TIMESTAMPING:
867 v.val = 0;
868 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
869 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
870 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
871 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
872 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
873 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
874 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
875 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
876 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
877 v.val |= SOF_TIMESTAMPING_SOFTWARE;
878 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
879 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
880 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
881 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
882 break;
883
884 case SO_RCVTIMEO:
885 lv = sizeof(struct timeval);
886 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
887 v.tm.tv_sec = 0;
888 v.tm.tv_usec = 0;
889 } else {
890 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
891 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
892 }
893 break;
894
895 case SO_SNDTIMEO:
896 lv = sizeof(struct timeval);
897 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
898 v.tm.tv_sec = 0;
899 v.tm.tv_usec = 0;
900 } else {
901 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
902 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
903 }
904 break;
905
906 case SO_RCVLOWAT:
907 v.val = sk->sk_rcvlowat;
908 break;
909
910 case SO_SNDLOWAT:
911 v.val = 1;
912 break;
913
914 case SO_PASSCRED:
915 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
916 break;
917
918 case SO_PEERCRED:
919 {
920 struct ucred peercred;
921 if (len > sizeof(peercred))
922 len = sizeof(peercred);
923 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
924 if (copy_to_user(optval, &peercred, len))
925 return -EFAULT;
926 goto lenout;
927 }
928
929 case SO_PEERNAME:
930 {
931 char address[128];
932
933 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
934 return -ENOTCONN;
935 if (lv < len)
936 return -EINVAL;
937 if (copy_to_user(optval, address, len))
938 return -EFAULT;
939 goto lenout;
940 }
941
942
943
944
945 case SO_ACCEPTCONN:
946 v.val = sk->sk_state == TCP_LISTEN;
947 break;
948
949 case SO_PASSSEC:
950 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
951 break;
952
953 case SO_PEERSEC:
954 return security_socket_getpeersec_stream(sock, optval, optlen, len);
955
956 case SO_MARK:
957 v.val = sk->sk_mark;
958 break;
959
960 case SO_RXQ_OVFL:
961 v.val = !!sock_flag(sk, SOCK_RXQ_OVFL);
962 break;
963
964 default:
965 return -ENOPROTOOPT;
966 }
967
968 if (len > lv)
969 len = lv;
970 if (copy_to_user(optval, &v, len))
971 return -EFAULT;
972lenout:
973 if (put_user(len, optlen))
974 return -EFAULT;
975 return 0;
976}
977
978
979
980
981
982
983static inline void sock_lock_init(struct sock *sk)
984{
985 sock_lock_init_class_and_name(sk,
986 af_family_slock_key_strings[sk->sk_family],
987 af_family_slock_keys + sk->sk_family,
988 af_family_key_strings[sk->sk_family],
989 af_family_keys + sk->sk_family);
990}
991
992
993
994
995
996
997static void sock_copy(struct sock *nsk, const struct sock *osk)
998{
999#ifdef CONFIG_SECURITY_NETWORK
1000 void *sptr = nsk->sk_security;
1001#endif
1002 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1003
1004 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1005 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1006
1007#ifdef CONFIG_SECURITY_NETWORK
1008 nsk->sk_security = sptr;
1009 security_sk_clone(osk, nsk);
1010#endif
1011}
1012
1013
1014
1015
1016
1017static inline void sk_prot_clear_nulls(struct sock *sk, int size)
1018{
1019 if (offsetof(struct sock, sk_node.next) != 0)
1020 memset(sk, 0, offsetof(struct sock, sk_node.next));
1021 memset(&sk->sk_node.pprev, 0,
1022 size - offsetof(struct sock, sk_node.pprev));
1023}
1024
1025void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1026{
1027 unsigned long nulls1, nulls2;
1028
1029 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1030 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1031 if (nulls1 > nulls2)
1032 swap(nulls1, nulls2);
1033
1034 if (nulls1 != 0)
1035 memset((char *)sk, 0, nulls1);
1036 memset((char *)sk + nulls1 + sizeof(void *), 0,
1037 nulls2 - nulls1 - sizeof(void *));
1038 memset((char *)sk + nulls2 + sizeof(void *), 0,
1039 size - nulls2 - sizeof(void *));
1040}
1041EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1042
1043static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1044 int family)
1045{
1046 struct sock *sk;
1047 struct kmem_cache *slab;
1048
1049 slab = prot->slab;
1050 if (slab != NULL) {
1051 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1052 if (!sk)
1053 return sk;
1054 if (priority & __GFP_ZERO) {
1055 if (prot->clear_sk)
1056 prot->clear_sk(sk, prot->obj_size);
1057 else
1058 sk_prot_clear_nulls(sk, prot->obj_size);
1059 }
1060 } else
1061 sk = kmalloc(prot->obj_size, priority);
1062
1063 if (sk != NULL) {
1064 kmemcheck_annotate_bitfield(sk, flags);
1065
1066 if (security_sk_alloc(sk, family, priority))
1067 goto out_free;
1068
1069 if (!try_module_get(prot->owner))
1070 goto out_free_sec;
1071 sk_tx_queue_clear(sk);
1072 }
1073
1074 return sk;
1075
1076out_free_sec:
1077 security_sk_free(sk);
1078out_free:
1079 if (slab != NULL)
1080 kmem_cache_free(slab, sk);
1081 else
1082 kfree(sk);
1083 return NULL;
1084}
1085
1086static void sk_prot_free(struct proto *prot, struct sock *sk)
1087{
1088 struct kmem_cache *slab;
1089 struct module *owner;
1090
1091 owner = prot->owner;
1092 slab = prot->slab;
1093
1094 security_sk_free(sk);
1095 if (slab != NULL)
1096 kmem_cache_free(slab, sk);
1097 else
1098 kfree(sk);
1099 module_put(owner);
1100}
1101
1102#ifdef CONFIG_CGROUPS
1103void sock_update_classid(struct sock *sk)
1104{
1105 u32 classid;
1106
1107 rcu_read_lock();
1108 classid = task_cls_classid(current);
1109 rcu_read_unlock();
1110 if (classid && classid != sk->sk_classid)
1111 sk->sk_classid = classid;
1112}
1113EXPORT_SYMBOL(sock_update_classid);
1114#endif
1115
1116
1117
1118
1119
1120
1121
1122
1123struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1124 struct proto *prot)
1125{
1126 struct sock *sk;
1127
1128 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1129 if (sk) {
1130 sk->sk_family = family;
1131
1132
1133
1134
1135 sk->sk_prot = sk->sk_prot_creator = prot;
1136 sock_lock_init(sk);
1137 sock_net_set(sk, get_net(net));
1138 atomic_set(&sk->sk_wmem_alloc, 1);
1139
1140 sock_update_classid(sk);
1141 }
1142
1143 return sk;
1144}
1145EXPORT_SYMBOL(sk_alloc);
1146
1147static void __sk_free(struct sock *sk)
1148{
1149 struct sk_filter *filter;
1150
1151 if (sk->sk_destruct)
1152 sk->sk_destruct(sk);
1153
1154 filter = rcu_dereference_check(sk->sk_filter,
1155 atomic_read(&sk->sk_wmem_alloc) == 0);
1156 if (filter) {
1157 sk_filter_uncharge(sk, filter);
1158 rcu_assign_pointer(sk->sk_filter, NULL);
1159 }
1160
1161 sock_disable_timestamp(sk, SOCK_TIMESTAMP);
1162 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
1163
1164 if (atomic_read(&sk->sk_omem_alloc))
1165 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
1166 __func__, atomic_read(&sk->sk_omem_alloc));
1167
1168 if (sk->sk_peer_cred)
1169 put_cred(sk->sk_peer_cred);
1170 put_pid(sk->sk_peer_pid);
1171 put_net(sock_net(sk));
1172 sk_prot_free(sk->sk_prot_creator, sk);
1173}
1174
1175void sk_free(struct sock *sk)
1176{
1177
1178
1179
1180
1181
1182 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1183 __sk_free(sk);
1184}
1185EXPORT_SYMBOL(sk_free);
1186
1187
1188
1189
1190
1191
1192
1193
1194void sk_release_kernel(struct sock *sk)
1195{
1196 if (sk == NULL || sk->sk_socket == NULL)
1197 return;
1198
1199 sock_hold(sk);
1200 sock_release(sk->sk_socket);
1201 release_net(sock_net(sk));
1202 sock_net_set(sk, get_net(&init_net));
1203 sock_put(sk);
1204}
1205EXPORT_SYMBOL(sk_release_kernel);
1206
1207struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
1208{
1209 struct sock *newsk;
1210
1211 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1212 if (newsk != NULL) {
1213 struct sk_filter *filter;
1214
1215 sock_copy(newsk, sk);
1216
1217
1218 get_net(sock_net(newsk));
1219 sk_node_init(&newsk->sk_node);
1220 sock_lock_init(newsk);
1221 bh_lock_sock(newsk);
1222 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1223 newsk->sk_backlog.len = 0;
1224
1225 atomic_set(&newsk->sk_rmem_alloc, 0);
1226
1227
1228
1229 atomic_set(&newsk->sk_wmem_alloc, 1);
1230 atomic_set(&newsk->sk_omem_alloc, 0);
1231 skb_queue_head_init(&newsk->sk_receive_queue);
1232 skb_queue_head_init(&newsk->sk_write_queue);
1233#ifdef CONFIG_NET_DMA
1234 skb_queue_head_init(&newsk->sk_async_wait_queue);
1235#endif
1236
1237 spin_lock_init(&newsk->sk_dst_lock);
1238 rwlock_init(&newsk->sk_callback_lock);
1239 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1240 af_callback_keys + newsk->sk_family,
1241 af_family_clock_key_strings[newsk->sk_family]);
1242
1243 newsk->sk_dst_cache = NULL;
1244 newsk->sk_wmem_queued = 0;
1245 newsk->sk_forward_alloc = 0;
1246 newsk->sk_send_head = NULL;
1247 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1248
1249 sock_reset_flag(newsk, SOCK_DONE);
1250 skb_queue_head_init(&newsk->sk_error_queue);
1251
1252 filter = rcu_dereference_protected(newsk->sk_filter, 1);
1253 if (filter != NULL)
1254 sk_filter_charge(newsk, filter);
1255
1256 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1257
1258
1259 newsk->sk_destruct = NULL;
1260 sk_free(newsk);
1261 newsk = NULL;
1262 goto out;
1263 }
1264
1265 newsk->sk_err = 0;
1266 newsk->sk_priority = 0;
1267
1268
1269
1270
1271 smp_wmb();
1272 atomic_set(&newsk->sk_refcnt, 2);
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285 sk_refcnt_debug_inc(newsk);
1286 sk_set_socket(newsk, NULL);
1287 newsk->sk_wq = NULL;
1288
1289 if (newsk->sk_prot->sockets_allocated)
1290 percpu_counter_inc(newsk->sk_prot->sockets_allocated);
1291
1292 if (sock_flag(newsk, SOCK_TIMESTAMP) ||
1293 sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1294 net_enable_timestamp();
1295 }
1296out:
1297 return newsk;
1298}
1299EXPORT_SYMBOL_GPL(sk_clone);
1300
1301void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1302{
1303 __sk_dst_set(sk, dst);
1304 sk->sk_route_caps = dst->dev->features;
1305 if (sk->sk_route_caps & NETIF_F_GSO)
1306 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1307 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1308 if (sk_can_gso(sk)) {
1309 if (dst->header_len) {
1310 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1311 } else {
1312 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1313 sk->sk_gso_max_size = dst->dev->gso_max_size;
1314 }
1315 }
1316}
1317EXPORT_SYMBOL_GPL(sk_setup_caps);
1318
1319void __init sk_init(void)
1320{
1321 if (totalram_pages <= 4096) {
1322 sysctl_wmem_max = 32767;
1323 sysctl_rmem_max = 32767;
1324 sysctl_wmem_default = 32767;
1325 sysctl_rmem_default = 32767;
1326 } else if (totalram_pages >= 131072) {
1327 sysctl_wmem_max = 131071;
1328 sysctl_rmem_max = 131071;
1329 }
1330}
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340void sock_wfree(struct sk_buff *skb)
1341{
1342 struct sock *sk = skb->sk;
1343 unsigned int len = skb->truesize;
1344
1345 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1346
1347
1348
1349
1350 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1351 sk->sk_write_space(sk);
1352 len = 1;
1353 }
1354
1355
1356
1357
1358 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
1359 __sk_free(sk);
1360}
1361EXPORT_SYMBOL(sock_wfree);
1362
1363
1364
1365
1366void sock_rfree(struct sk_buff *skb)
1367{
1368 struct sock *sk = skb->sk;
1369 unsigned int len = skb->truesize;
1370
1371 atomic_sub(len, &sk->sk_rmem_alloc);
1372 sk_mem_uncharge(sk, len);
1373}
1374EXPORT_SYMBOL(sock_rfree);
1375
1376
1377int sock_i_uid(struct sock *sk)
1378{
1379 int uid;
1380
1381 read_lock_bh(&sk->sk_callback_lock);
1382 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1383 read_unlock_bh(&sk->sk_callback_lock);
1384 return uid;
1385}
1386EXPORT_SYMBOL(sock_i_uid);
1387
1388unsigned long sock_i_ino(struct sock *sk)
1389{
1390 unsigned long ino;
1391
1392 read_lock_bh(&sk->sk_callback_lock);
1393 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1394 read_unlock_bh(&sk->sk_callback_lock);
1395 return ino;
1396}
1397EXPORT_SYMBOL(sock_i_ino);
1398
1399
1400
1401
1402struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1403 gfp_t priority)
1404{
1405 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1406 struct sk_buff *skb = alloc_skb(size, priority);
1407 if (skb) {
1408 skb_set_owner_w(skb, sk);
1409 return skb;
1410 }
1411 }
1412 return NULL;
1413}
1414EXPORT_SYMBOL(sock_wmalloc);
1415
1416
1417
1418
1419struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1420 gfp_t priority)
1421{
1422 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1423 struct sk_buff *skb = alloc_skb(size, priority);
1424 if (skb) {
1425 skb_set_owner_r(skb, sk);
1426 return skb;
1427 }
1428 }
1429 return NULL;
1430}
1431
1432
1433
1434
1435void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1436{
1437 if ((unsigned)size <= sysctl_optmem_max &&
1438 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1439 void *mem;
1440
1441
1442
1443 atomic_add(size, &sk->sk_omem_alloc);
1444 mem = kmalloc(size, priority);
1445 if (mem)
1446 return mem;
1447 atomic_sub(size, &sk->sk_omem_alloc);
1448 }
1449 return NULL;
1450}
1451EXPORT_SYMBOL(sock_kmalloc);
1452
1453
1454
1455
1456void sock_kfree_s(struct sock *sk, void *mem, int size)
1457{
1458 kfree(mem);
1459 atomic_sub(size, &sk->sk_omem_alloc);
1460}
1461EXPORT_SYMBOL(sock_kfree_s);
1462
1463
1464
1465
1466static long sock_wait_for_wmem(struct sock *sk, long timeo)
1467{
1468 DEFINE_WAIT(wait);
1469
1470 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1471 for (;;) {
1472 if (!timeo)
1473 break;
1474 if (signal_pending(current))
1475 break;
1476 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1477 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1478 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1479 break;
1480 if (sk->sk_shutdown & SEND_SHUTDOWN)
1481 break;
1482 if (sk->sk_err)
1483 break;
1484 timeo = schedule_timeout(timeo);
1485 }
1486 finish_wait(sk_sleep(sk), &wait);
1487 return timeo;
1488}
1489
1490
1491
1492
1493
1494
1495struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1496 unsigned long data_len, int noblock,
1497 int *errcode)
1498{
1499 struct sk_buff *skb;
1500 gfp_t gfp_mask;
1501 long timeo;
1502 int err;
1503
1504 gfp_mask = sk->sk_allocation;
1505 if (gfp_mask & __GFP_WAIT)
1506 gfp_mask |= __GFP_REPEAT;
1507
1508 timeo = sock_sndtimeo(sk, noblock);
1509 while (1) {
1510 err = sock_error(sk);
1511 if (err != 0)
1512 goto failure;
1513
1514 err = -EPIPE;
1515 if (sk->sk_shutdown & SEND_SHUTDOWN)
1516 goto failure;
1517
1518 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1519 skb = alloc_skb(header_len, gfp_mask);
1520 if (skb) {
1521 int npages;
1522 int i;
1523
1524
1525 if (!data_len)
1526 break;
1527
1528 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1529 skb->truesize += data_len;
1530 skb_shinfo(skb)->nr_frags = npages;
1531 for (i = 0; i < npages; i++) {
1532 struct page *page;
1533 skb_frag_t *frag;
1534
1535 page = alloc_pages(sk->sk_allocation, 0);
1536 if (!page) {
1537 err = -ENOBUFS;
1538 skb_shinfo(skb)->nr_frags = i;
1539 kfree_skb(skb);
1540 goto failure;
1541 }
1542
1543 frag = &skb_shinfo(skb)->frags[i];
1544 frag->page = page;
1545 frag->page_offset = 0;
1546 frag->size = (data_len >= PAGE_SIZE ?
1547 PAGE_SIZE :
1548 data_len);
1549 data_len -= PAGE_SIZE;
1550 }
1551
1552
1553 break;
1554 }
1555 err = -ENOBUFS;
1556 goto failure;
1557 }
1558 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1559 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1560 err = -EAGAIN;
1561 if (!timeo)
1562 goto failure;
1563 if (signal_pending(current))
1564 goto interrupted;
1565 timeo = sock_wait_for_wmem(sk, timeo);
1566 }
1567
1568 skb_set_owner_w(skb, sk);
1569 return skb;
1570
1571interrupted:
1572 err = sock_intr_errno(timeo);
1573failure:
1574 *errcode = err;
1575 return NULL;
1576}
1577EXPORT_SYMBOL(sock_alloc_send_pskb);
1578
1579struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1580 int noblock, int *errcode)
1581{
1582 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1583}
1584EXPORT_SYMBOL(sock_alloc_send_skb);
1585
1586static void __lock_sock(struct sock *sk)
1587 __releases(&sk->sk_lock.slock)
1588 __acquires(&sk->sk_lock.slock)
1589{
1590 DEFINE_WAIT(wait);
1591
1592 for (;;) {
1593 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1594 TASK_UNINTERRUPTIBLE);
1595 spin_unlock_bh(&sk->sk_lock.slock);
1596 schedule();
1597 spin_lock_bh(&sk->sk_lock.slock);
1598 if (!sock_owned_by_user(sk))
1599 break;
1600 }
1601 finish_wait(&sk->sk_lock.wq, &wait);
1602}
1603
1604static void __release_sock(struct sock *sk)
1605 __releases(&sk->sk_lock.slock)
1606 __acquires(&sk->sk_lock.slock)
1607{
1608 struct sk_buff *skb = sk->sk_backlog.head;
1609
1610 do {
1611 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1612 bh_unlock_sock(sk);
1613
1614 do {
1615 struct sk_buff *next = skb->next;
1616
1617 WARN_ON_ONCE(skb_dst_is_noref(skb));
1618 skb->next = NULL;
1619 sk_backlog_rcv(sk, skb);
1620
1621
1622
1623
1624
1625
1626
1627 cond_resched_softirq();
1628
1629 skb = next;
1630 } while (skb != NULL);
1631
1632 bh_lock_sock(sk);
1633 } while ((skb = sk->sk_backlog.head) != NULL);
1634
1635
1636
1637
1638
1639 sk->sk_backlog.len = 0;
1640}
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652int sk_wait_data(struct sock *sk, long *timeo)
1653{
1654 int rc;
1655 DEFINE_WAIT(wait);
1656
1657 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1658 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1659 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1660 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1661 finish_wait(sk_sleep(sk), &wait);
1662 return rc;
1663}
1664EXPORT_SYMBOL(sk_wait_data);
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676int __sk_mem_schedule(struct sock *sk, int size, int kind)
1677{
1678 struct proto *prot = sk->sk_prot;
1679 int amt = sk_mem_pages(size);
1680 long allocated;
1681
1682 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1683 allocated = atomic_long_add_return(amt, prot->memory_allocated);
1684
1685
1686 if (allocated <= prot->sysctl_mem[0]) {
1687 if (prot->memory_pressure && *prot->memory_pressure)
1688 *prot->memory_pressure = 0;
1689 return 1;
1690 }
1691
1692
1693 if (allocated > prot->sysctl_mem[1])
1694 if (prot->enter_memory_pressure)
1695 prot->enter_memory_pressure(sk);
1696
1697
1698 if (allocated > prot->sysctl_mem[2])
1699 goto suppress_allocation;
1700
1701
1702 if (kind == SK_MEM_RECV) {
1703 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1704 return 1;
1705 } else {
1706 if (sk->sk_type == SOCK_STREAM) {
1707 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1708 return 1;
1709 } else if (atomic_read(&sk->sk_wmem_alloc) <
1710 prot->sysctl_wmem[0])
1711 return 1;
1712 }
1713
1714 if (prot->memory_pressure) {
1715 int alloc;
1716
1717 if (!*prot->memory_pressure)
1718 return 1;
1719 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1720 if (prot->sysctl_mem[2] > alloc *
1721 sk_mem_pages(sk->sk_wmem_queued +
1722 atomic_read(&sk->sk_rmem_alloc) +
1723 sk->sk_forward_alloc))
1724 return 1;
1725 }
1726
1727suppress_allocation:
1728
1729 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1730 sk_stream_moderate_sndbuf(sk);
1731
1732
1733
1734
1735 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1736 return 1;
1737 }
1738
1739
1740 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1741 atomic_long_sub(amt, prot->memory_allocated);
1742 return 0;
1743}
1744EXPORT_SYMBOL(__sk_mem_schedule);
1745
1746
1747
1748
1749
1750void __sk_mem_reclaim(struct sock *sk)
1751{
1752 struct proto *prot = sk->sk_prot;
1753
1754 atomic_long_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
1755 prot->memory_allocated);
1756 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1757
1758 if (prot->memory_pressure && *prot->memory_pressure &&
1759 (atomic_long_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1760 *prot->memory_pressure = 0;
1761}
1762EXPORT_SYMBOL(__sk_mem_reclaim);
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1773{
1774 return -EOPNOTSUPP;
1775}
1776EXPORT_SYMBOL(sock_no_bind);
1777
1778int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1779 int len, int flags)
1780{
1781 return -EOPNOTSUPP;
1782}
1783EXPORT_SYMBOL(sock_no_connect);
1784
1785int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1786{
1787 return -EOPNOTSUPP;
1788}
1789EXPORT_SYMBOL(sock_no_socketpair);
1790
1791int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1792{
1793 return -EOPNOTSUPP;
1794}
1795EXPORT_SYMBOL(sock_no_accept);
1796
1797int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1798 int *len, int peer)
1799{
1800 return -EOPNOTSUPP;
1801}
1802EXPORT_SYMBOL(sock_no_getname);
1803
1804unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1805{
1806 return 0;
1807}
1808EXPORT_SYMBOL(sock_no_poll);
1809
1810int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1811{
1812 return -EOPNOTSUPP;
1813}
1814EXPORT_SYMBOL(sock_no_ioctl);
1815
1816int sock_no_listen(struct socket *sock, int backlog)
1817{
1818 return -EOPNOTSUPP;
1819}
1820EXPORT_SYMBOL(sock_no_listen);
1821
1822int sock_no_shutdown(struct socket *sock, int how)
1823{
1824 return -EOPNOTSUPP;
1825}
1826EXPORT_SYMBOL(sock_no_shutdown);
1827
1828int sock_no_setsockopt(struct socket *sock, int level, int optname,
1829 char __user *optval, unsigned int optlen)
1830{
1831 return -EOPNOTSUPP;
1832}
1833EXPORT_SYMBOL(sock_no_setsockopt);
1834
1835int sock_no_getsockopt(struct socket *sock, int level, int optname,
1836 char __user *optval, int __user *optlen)
1837{
1838 return -EOPNOTSUPP;
1839}
1840EXPORT_SYMBOL(sock_no_getsockopt);
1841
1842int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1843 size_t len)
1844{
1845 return -EOPNOTSUPP;
1846}
1847EXPORT_SYMBOL(sock_no_sendmsg);
1848
1849int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1850 size_t len, int flags)
1851{
1852 return -EOPNOTSUPP;
1853}
1854EXPORT_SYMBOL(sock_no_recvmsg);
1855
1856int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1857{
1858
1859 return -ENODEV;
1860}
1861EXPORT_SYMBOL(sock_no_mmap);
1862
1863ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1864{
1865 ssize_t res;
1866 struct msghdr msg = {.msg_flags = flags};
1867 struct kvec iov;
1868 char *kaddr = kmap(page);
1869 iov.iov_base = kaddr + offset;
1870 iov.iov_len = size;
1871 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1872 kunmap(page);
1873 return res;
1874}
1875EXPORT_SYMBOL(sock_no_sendpage);
1876
1877
1878
1879
1880
1881static void sock_def_wakeup(struct sock *sk)
1882{
1883 struct socket_wq *wq;
1884
1885 rcu_read_lock();
1886 wq = rcu_dereference(sk->sk_wq);
1887 if (wq_has_sleeper(wq))
1888 wake_up_interruptible_all(&wq->wait);
1889 rcu_read_unlock();
1890}
1891
1892static void sock_def_error_report(struct sock *sk)
1893{
1894 struct socket_wq *wq;
1895
1896 rcu_read_lock();
1897 wq = rcu_dereference(sk->sk_wq);
1898 if (wq_has_sleeper(wq))
1899 wake_up_interruptible_poll(&wq->wait, POLLERR);
1900 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1901 rcu_read_unlock();
1902}
1903
1904static void sock_def_readable(struct sock *sk, int len)
1905{
1906 struct socket_wq *wq;
1907
1908 rcu_read_lock();
1909 wq = rcu_dereference(sk->sk_wq);
1910 if (wq_has_sleeper(wq))
1911 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
1912 POLLRDNORM | POLLRDBAND);
1913 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1914 rcu_read_unlock();
1915}
1916
1917static void sock_def_write_space(struct sock *sk)
1918{
1919 struct socket_wq *wq;
1920
1921 rcu_read_lock();
1922
1923
1924
1925
1926 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1927 wq = rcu_dereference(sk->sk_wq);
1928 if (wq_has_sleeper(wq))
1929 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
1930 POLLWRNORM | POLLWRBAND);
1931
1932
1933 if (sock_writeable(sk))
1934 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1935 }
1936
1937 rcu_read_unlock();
1938}
1939
1940static void sock_def_destruct(struct sock *sk)
1941{
1942 kfree(sk->sk_protinfo);
1943}
1944
1945void sk_send_sigurg(struct sock *sk)
1946{
1947 if (sk->sk_socket && sk->sk_socket->file)
1948 if (send_sigurg(&sk->sk_socket->file->f_owner))
1949 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1950}
1951EXPORT_SYMBOL(sk_send_sigurg);
1952
1953void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1954 unsigned long expires)
1955{
1956 if (!mod_timer(timer, expires))
1957 sock_hold(sk);
1958}
1959EXPORT_SYMBOL(sk_reset_timer);
1960
1961void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1962{
1963 if (timer_pending(timer) && del_timer(timer))
1964 __sock_put(sk);
1965}
1966EXPORT_SYMBOL(sk_stop_timer);
1967
1968void sock_init_data(struct socket *sock, struct sock *sk)
1969{
1970 skb_queue_head_init(&sk->sk_receive_queue);
1971 skb_queue_head_init(&sk->sk_write_queue);
1972 skb_queue_head_init(&sk->sk_error_queue);
1973#ifdef CONFIG_NET_DMA
1974 skb_queue_head_init(&sk->sk_async_wait_queue);
1975#endif
1976
1977 sk->sk_send_head = NULL;
1978
1979 init_timer(&sk->sk_timer);
1980
1981 sk->sk_allocation = GFP_KERNEL;
1982 sk->sk_rcvbuf = sysctl_rmem_default;
1983 sk->sk_sndbuf = sysctl_wmem_default;
1984 sk->sk_state = TCP_CLOSE;
1985 sk_set_socket(sk, sock);
1986
1987 sock_set_flag(sk, SOCK_ZAPPED);
1988
1989 if (sock) {
1990 sk->sk_type = sock->type;
1991 sk->sk_wq = sock->wq;
1992 sock->sk = sk;
1993 } else
1994 sk->sk_wq = NULL;
1995
1996 spin_lock_init(&sk->sk_dst_lock);
1997 rwlock_init(&sk->sk_callback_lock);
1998 lockdep_set_class_and_name(&sk->sk_callback_lock,
1999 af_callback_keys + sk->sk_family,
2000 af_family_clock_key_strings[sk->sk_family]);
2001
2002 sk->sk_state_change = sock_def_wakeup;
2003 sk->sk_data_ready = sock_def_readable;
2004 sk->sk_write_space = sock_def_write_space;
2005 sk->sk_error_report = sock_def_error_report;
2006 sk->sk_destruct = sock_def_destruct;
2007
2008 sk->sk_sndmsg_page = NULL;
2009 sk->sk_sndmsg_off = 0;
2010
2011 sk->sk_peer_pid = NULL;
2012 sk->sk_peer_cred = NULL;
2013 sk->sk_write_pending = 0;
2014 sk->sk_rcvlowat = 1;
2015 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2016 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2017
2018 sk->sk_stamp = ktime_set(-1L, 0);
2019
2020
2021
2022
2023
2024 smp_wmb();
2025 atomic_set(&sk->sk_refcnt, 1);
2026 atomic_set(&sk->sk_drops, 0);
2027}
2028EXPORT_SYMBOL(sock_init_data);
2029
2030void lock_sock_nested(struct sock *sk, int subclass)
2031{
2032 might_sleep();
2033 spin_lock_bh(&sk->sk_lock.slock);
2034 if (sk->sk_lock.owned)
2035 __lock_sock(sk);
2036 sk->sk_lock.owned = 1;
2037 spin_unlock(&sk->sk_lock.slock);
2038
2039
2040
2041 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2042 local_bh_enable();
2043}
2044EXPORT_SYMBOL(lock_sock_nested);
2045
2046void release_sock(struct sock *sk)
2047{
2048
2049
2050
2051 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2052
2053 spin_lock_bh(&sk->sk_lock.slock);
2054 if (sk->sk_backlog.tail)
2055 __release_sock(sk);
2056 sk->sk_lock.owned = 0;
2057 if (waitqueue_active(&sk->sk_lock.wq))
2058 wake_up(&sk->sk_lock.wq);
2059 spin_unlock_bh(&sk->sk_lock.slock);
2060}
2061EXPORT_SYMBOL(release_sock);
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073bool lock_sock_fast(struct sock *sk)
2074{
2075 might_sleep();
2076 spin_lock_bh(&sk->sk_lock.slock);
2077
2078 if (!sk->sk_lock.owned)
2079
2080
2081
2082 return false;
2083
2084 __lock_sock(sk);
2085 sk->sk_lock.owned = 1;
2086 spin_unlock(&sk->sk_lock.slock);
2087
2088
2089
2090 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2091 local_bh_enable();
2092 return true;
2093}
2094EXPORT_SYMBOL(lock_sock_fast);
2095
2096int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2097{
2098 struct timeval tv;
2099 if (!sock_flag(sk, SOCK_TIMESTAMP))
2100 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2101 tv = ktime_to_timeval(sk->sk_stamp);
2102 if (tv.tv_sec == -1)
2103 return -ENOENT;
2104 if (tv.tv_sec == 0) {
2105 sk->sk_stamp = ktime_get_real();
2106 tv = ktime_to_timeval(sk->sk_stamp);
2107 }
2108 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
2109}
2110EXPORT_SYMBOL(sock_get_timestamp);
2111
2112int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2113{
2114 struct timespec ts;
2115 if (!sock_flag(sk, SOCK_TIMESTAMP))
2116 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2117 ts = ktime_to_timespec(sk->sk_stamp);
2118 if (ts.tv_sec == -1)
2119 return -ENOENT;
2120 if (ts.tv_sec == 0) {
2121 sk->sk_stamp = ktime_get_real();
2122 ts = ktime_to_timespec(sk->sk_stamp);
2123 }
2124 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2125}
2126EXPORT_SYMBOL(sock_get_timestampns);
2127
2128void sock_enable_timestamp(struct sock *sk, int flag)
2129{
2130 if (!sock_flag(sk, flag)) {
2131 sock_set_flag(sk, flag);
2132
2133
2134
2135
2136
2137 if (!sock_flag(sk,
2138 flag == SOCK_TIMESTAMP ?
2139 SOCK_TIMESTAMPING_RX_SOFTWARE :
2140 SOCK_TIMESTAMP))
2141 net_enable_timestamp();
2142 }
2143}
2144
2145
2146
2147
2148
2149
2150
2151
2152int sock_common_getsockopt(struct socket *sock, int level, int optname,
2153 char __user *optval, int __user *optlen)
2154{
2155 struct sock *sk = sock->sk;
2156
2157 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2158}
2159EXPORT_SYMBOL(sock_common_getsockopt);
2160
2161#ifdef CONFIG_COMPAT
2162int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2163 char __user *optval, int __user *optlen)
2164{
2165 struct sock *sk = sock->sk;
2166
2167 if (sk->sk_prot->compat_getsockopt != NULL)
2168 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2169 optval, optlen);
2170 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2171}
2172EXPORT_SYMBOL(compat_sock_common_getsockopt);
2173#endif
2174
2175int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2176 struct msghdr *msg, size_t size, int flags)
2177{
2178 struct sock *sk = sock->sk;
2179 int addr_len = 0;
2180 int err;
2181
2182 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2183 flags & ~MSG_DONTWAIT, &addr_len);
2184 if (err >= 0)
2185 msg->msg_namelen = addr_len;
2186 return err;
2187}
2188EXPORT_SYMBOL(sock_common_recvmsg);
2189
2190
2191
2192
2193int sock_common_setsockopt(struct socket *sock, int level, int optname,
2194 char __user *optval, unsigned int optlen)
2195{
2196 struct sock *sk = sock->sk;
2197
2198 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2199}
2200EXPORT_SYMBOL(sock_common_setsockopt);
2201
2202#ifdef CONFIG_COMPAT
2203int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2204 char __user *optval, unsigned int optlen)
2205{
2206 struct sock *sk = sock->sk;
2207
2208 if (sk->sk_prot->compat_setsockopt != NULL)
2209 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2210 optval, optlen);
2211 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2212}
2213EXPORT_SYMBOL(compat_sock_common_setsockopt);
2214#endif
2215
2216void sk_common_release(struct sock *sk)
2217{
2218 if (sk->sk_prot->destroy)
2219 sk->sk_prot->destroy(sk);
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229 sk->sk_prot->unhash(sk);
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243 sock_orphan(sk);
2244
2245 xfrm_sk_free_policy(sk);
2246
2247 sk_refcnt_debug_release(sk);
2248 sock_put(sk);
2249}
2250EXPORT_SYMBOL(sk_common_release);
2251
2252static DEFINE_RWLOCK(proto_list_lock);
2253static LIST_HEAD(proto_list);
2254
2255#ifdef CONFIG_PROC_FS
2256#define PROTO_INUSE_NR 64
2257struct prot_inuse {
2258 int val[PROTO_INUSE_NR];
2259};
2260
2261static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2262
2263#ifdef CONFIG_NET_NS
2264void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2265{
2266 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
2267}
2268EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2269
2270int sock_prot_inuse_get(struct net *net, struct proto *prot)
2271{
2272 int cpu, idx = prot->inuse_idx;
2273 int res = 0;
2274
2275 for_each_possible_cpu(cpu)
2276 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2277
2278 return res >= 0 ? res : 0;
2279}
2280EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2281
2282static int __net_init sock_inuse_init_net(struct net *net)
2283{
2284 net->core.inuse = alloc_percpu(struct prot_inuse);
2285 return net->core.inuse ? 0 : -ENOMEM;
2286}
2287
2288static void __net_exit sock_inuse_exit_net(struct net *net)
2289{
2290 free_percpu(net->core.inuse);
2291}
2292
2293static struct pernet_operations net_inuse_ops = {
2294 .init = sock_inuse_init_net,
2295 .exit = sock_inuse_exit_net,
2296};
2297
2298static __init int net_inuse_init(void)
2299{
2300 if (register_pernet_subsys(&net_inuse_ops))
2301 panic("Cannot initialize net inuse counters");
2302
2303 return 0;
2304}
2305
2306core_initcall(net_inuse_init);
2307#else
2308static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2309
2310void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2311{
2312 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
2313}
2314EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2315
2316int sock_prot_inuse_get(struct net *net, struct proto *prot)
2317{
2318 int cpu, idx = prot->inuse_idx;
2319 int res = 0;
2320
2321 for_each_possible_cpu(cpu)
2322 res += per_cpu(prot_inuse, cpu).val[idx];
2323
2324 return res >= 0 ? res : 0;
2325}
2326EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2327#endif
2328
2329static void assign_proto_idx(struct proto *prot)
2330{
2331 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2332
2333 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2334 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2335 return;
2336 }
2337
2338 set_bit(prot->inuse_idx, proto_inuse_idx);
2339}
2340
2341static void release_proto_idx(struct proto *prot)
2342{
2343 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2344 clear_bit(prot->inuse_idx, proto_inuse_idx);
2345}
2346#else
2347static inline void assign_proto_idx(struct proto *prot)
2348{
2349}
2350
2351static inline void release_proto_idx(struct proto *prot)
2352{
2353}
2354#endif
2355
2356int proto_register(struct proto *prot, int alloc_slab)
2357{
2358 if (alloc_slab) {
2359 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2360 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2361 NULL);
2362
2363 if (prot->slab == NULL) {
2364 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2365 prot->name);
2366 goto out;
2367 }
2368
2369 if (prot->rsk_prot != NULL) {
2370 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
2371 if (prot->rsk_prot->slab_name == NULL)
2372 goto out_free_sock_slab;
2373
2374 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2375 prot->rsk_prot->obj_size, 0,
2376 SLAB_HWCACHE_ALIGN, NULL);
2377
2378 if (prot->rsk_prot->slab == NULL) {
2379 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2380 prot->name);
2381 goto out_free_request_sock_slab_name;
2382 }
2383 }
2384
2385 if (prot->twsk_prot != NULL) {
2386 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
2387
2388 if (prot->twsk_prot->twsk_slab_name == NULL)
2389 goto out_free_request_sock_slab;
2390
2391 prot->twsk_prot->twsk_slab =
2392 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2393 prot->twsk_prot->twsk_obj_size,
2394 0,
2395 SLAB_HWCACHE_ALIGN |
2396 prot->slab_flags,
2397 NULL);
2398 if (prot->twsk_prot->twsk_slab == NULL)
2399 goto out_free_timewait_sock_slab_name;
2400 }
2401 }
2402
2403 write_lock(&proto_list_lock);
2404 list_add(&prot->node, &proto_list);
2405 assign_proto_idx(prot);
2406 write_unlock(&proto_list_lock);
2407 return 0;
2408
2409out_free_timewait_sock_slab_name:
2410 kfree(prot->twsk_prot->twsk_slab_name);
2411out_free_request_sock_slab:
2412 if (prot->rsk_prot && prot->rsk_prot->slab) {
2413 kmem_cache_destroy(prot->rsk_prot->slab);
2414 prot->rsk_prot->slab = NULL;
2415 }
2416out_free_request_sock_slab_name:
2417 if (prot->rsk_prot)
2418 kfree(prot->rsk_prot->slab_name);
2419out_free_sock_slab:
2420 kmem_cache_destroy(prot->slab);
2421 prot->slab = NULL;
2422out:
2423 return -ENOBUFS;
2424}
2425EXPORT_SYMBOL(proto_register);
2426
2427void proto_unregister(struct proto *prot)
2428{
2429 write_lock(&proto_list_lock);
2430 release_proto_idx(prot);
2431 list_del(&prot->node);
2432 write_unlock(&proto_list_lock);
2433
2434 if (prot->slab != NULL) {
2435 kmem_cache_destroy(prot->slab);
2436 prot->slab = NULL;
2437 }
2438
2439 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2440 kmem_cache_destroy(prot->rsk_prot->slab);
2441 kfree(prot->rsk_prot->slab_name);
2442 prot->rsk_prot->slab = NULL;
2443 }
2444
2445 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2446 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2447 kfree(prot->twsk_prot->twsk_slab_name);
2448 prot->twsk_prot->twsk_slab = NULL;
2449 }
2450}
2451EXPORT_SYMBOL(proto_unregister);
2452
2453#ifdef CONFIG_PROC_FS
2454static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2455 __acquires(proto_list_lock)
2456{
2457 read_lock(&proto_list_lock);
2458 return seq_list_start_head(&proto_list, *pos);
2459}
2460
2461static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2462{
2463 return seq_list_next(v, &proto_list, pos);
2464}
2465
2466static void proto_seq_stop(struct seq_file *seq, void *v)
2467 __releases(proto_list_lock)
2468{
2469 read_unlock(&proto_list_lock);
2470}
2471
2472static char proto_method_implemented(const void *method)
2473{
2474 return method == NULL ? 'n' : 'y';
2475}
2476
2477static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2478{
2479 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
2480 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2481 proto->name,
2482 proto->obj_size,
2483 sock_prot_inuse_get(seq_file_net(seq), proto),
2484 proto->memory_allocated != NULL ? atomic_long_read(proto->memory_allocated) : -1L,
2485 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2486 proto->max_header,
2487 proto->slab == NULL ? "no" : "yes",
2488 module_name(proto->owner),
2489 proto_method_implemented(proto->close),
2490 proto_method_implemented(proto->connect),
2491 proto_method_implemented(proto->disconnect),
2492 proto_method_implemented(proto->accept),
2493 proto_method_implemented(proto->ioctl),
2494 proto_method_implemented(proto->init),
2495 proto_method_implemented(proto->destroy),
2496 proto_method_implemented(proto->shutdown),
2497 proto_method_implemented(proto->setsockopt),
2498 proto_method_implemented(proto->getsockopt),
2499 proto_method_implemented(proto->sendmsg),
2500 proto_method_implemented(proto->recvmsg),
2501 proto_method_implemented(proto->sendpage),
2502 proto_method_implemented(proto->bind),
2503 proto_method_implemented(proto->backlog_rcv),
2504 proto_method_implemented(proto->hash),
2505 proto_method_implemented(proto->unhash),
2506 proto_method_implemented(proto->get_port),
2507 proto_method_implemented(proto->enter_memory_pressure));
2508}
2509
2510static int proto_seq_show(struct seq_file *seq, void *v)
2511{
2512 if (v == &proto_list)
2513 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2514 "protocol",
2515 "size",
2516 "sockets",
2517 "memory",
2518 "press",
2519 "maxhdr",
2520 "slab",
2521 "module",
2522 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2523 else
2524 proto_seq_printf(seq, list_entry(v, struct proto, node));
2525 return 0;
2526}
2527
2528static const struct seq_operations proto_seq_ops = {
2529 .start = proto_seq_start,
2530 .next = proto_seq_next,
2531 .stop = proto_seq_stop,
2532 .show = proto_seq_show,
2533};
2534
2535static int proto_seq_open(struct inode *inode, struct file *file)
2536{
2537 return seq_open_net(inode, file, &proto_seq_ops,
2538 sizeof(struct seq_net_private));
2539}
2540
2541static const struct file_operations proto_seq_fops = {
2542 .owner = THIS_MODULE,
2543 .open = proto_seq_open,
2544 .read = seq_read,
2545 .llseek = seq_lseek,
2546 .release = seq_release_net,
2547};
2548
2549static __net_init int proto_init_net(struct net *net)
2550{
2551 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2552 return -ENOMEM;
2553
2554 return 0;
2555}
2556
2557static __net_exit void proto_exit_net(struct net *net)
2558{
2559 proc_net_remove(net, "protocols");
2560}
2561
2562
2563static __net_initdata struct pernet_operations proto_net_ops = {
2564 .init = proto_init_net,
2565 .exit = proto_exit_net,
2566};
2567
2568static int __init proto_init(void)
2569{
2570 return register_pernet_subsys(&proto_net_ops);
2571}
2572
2573subsys_initcall(proto_init);
2574
2575#endif
2576