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49#include <linux/module.h>
50#include <linux/init.h>
51#include <linux/netdevice.h>
52#include <linux/inetdevice.h>
53#include <linux/seq_file.h>
54#include <linux/bootmem.h>
55#include <linux/highmem.h>
56#include <linux/swap.h>
57#include <net/net_namespace.h>
58#include <net/protocol.h>
59#include <net/ip.h>
60#include <net/ipv6.h>
61#include <net/route.h>
62#include <net/sctp/sctp.h>
63#include <net/addrconf.h>
64#include <net/inet_common.h>
65#include <net/inet_ecn.h>
66
67
68struct sctp_globals sctp_globals __read_mostly;
69DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly;
70
71#ifdef CONFIG_PROC_FS
72struct proc_dir_entry *proc_net_sctp;
73#endif
74
75struct idr sctp_assocs_id;
76DEFINE_SPINLOCK(sctp_assocs_id_lock);
77
78
79
80
81
82static struct sock *sctp_ctl_sock;
83
84static struct sctp_pf *sctp_pf_inet6_specific;
85static struct sctp_pf *sctp_pf_inet_specific;
86static struct sctp_af *sctp_af_v4_specific;
87static struct sctp_af *sctp_af_v6_specific;
88
89struct kmem_cache *sctp_chunk_cachep __read_mostly;
90struct kmem_cache *sctp_bucket_cachep __read_mostly;
91
92int sysctl_sctp_mem[3];
93int sysctl_sctp_rmem[3];
94int sysctl_sctp_wmem[3];
95
96
97struct sock *sctp_get_ctl_sock(void)
98{
99 return sctp_ctl_sock;
100}
101
102
103static __init int sctp_proc_init(void)
104{
105 if (percpu_counter_init(&sctp_sockets_allocated, 0))
106 goto out_nomem;
107#ifdef CONFIG_PROC_FS
108 if (!proc_net_sctp) {
109 proc_net_sctp = proc_mkdir("sctp", init_net.proc_net);
110 if (!proc_net_sctp)
111 goto out_free_percpu;
112 }
113
114 if (sctp_snmp_proc_init())
115 goto out_snmp_proc_init;
116 if (sctp_eps_proc_init())
117 goto out_eps_proc_init;
118 if (sctp_assocs_proc_init())
119 goto out_assocs_proc_init;
120 if (sctp_remaddr_proc_init())
121 goto out_remaddr_proc_init;
122
123 return 0;
124
125out_remaddr_proc_init:
126 sctp_assocs_proc_exit();
127out_assocs_proc_init:
128 sctp_eps_proc_exit();
129out_eps_proc_init:
130 sctp_snmp_proc_exit();
131out_snmp_proc_init:
132 if (proc_net_sctp) {
133 proc_net_sctp = NULL;
134 remove_proc_entry("sctp", init_net.proc_net);
135 }
136out_free_percpu:
137 percpu_counter_destroy(&sctp_sockets_allocated);
138#else
139 return 0;
140#endif
141
142out_nomem:
143 return -ENOMEM;
144}
145
146
147
148
149
150static void sctp_proc_exit(void)
151{
152#ifdef CONFIG_PROC_FS
153 sctp_snmp_proc_exit();
154 sctp_eps_proc_exit();
155 sctp_assocs_proc_exit();
156 sctp_remaddr_proc_exit();
157
158 if (proc_net_sctp) {
159 proc_net_sctp = NULL;
160 remove_proc_entry("sctp", init_net.proc_net);
161 }
162#endif
163 percpu_counter_destroy(&sctp_sockets_allocated);
164}
165
166
167
168
169static void sctp_v4_copy_addrlist(struct list_head *addrlist,
170 struct net_device *dev)
171{
172 struct in_device *in_dev;
173 struct in_ifaddr *ifa;
174 struct sctp_sockaddr_entry *addr;
175
176 rcu_read_lock();
177 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
178 rcu_read_unlock();
179 return;
180 }
181
182 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
183
184 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
185 if (addr) {
186 addr->a.v4.sin_family = AF_INET;
187 addr->a.v4.sin_port = 0;
188 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
189 addr->valid = 1;
190 INIT_LIST_HEAD(&addr->list);
191 INIT_RCU_HEAD(&addr->rcu);
192 list_add_tail(&addr->list, addrlist);
193 }
194 }
195
196 rcu_read_unlock();
197}
198
199
200
201
202static void sctp_get_local_addr_list(void)
203{
204 struct net_device *dev;
205 struct list_head *pos;
206 struct sctp_af *af;
207
208 read_lock(&dev_base_lock);
209 for_each_netdev(&init_net, dev) {
210 __list_for_each(pos, &sctp_address_families) {
211 af = list_entry(pos, struct sctp_af, list);
212 af->copy_addrlist(&sctp_local_addr_list, dev);
213 }
214 }
215 read_unlock(&dev_base_lock);
216}
217
218
219static void sctp_free_local_addr_list(void)
220{
221 struct sctp_sockaddr_entry *addr;
222 struct list_head *pos, *temp;
223
224 list_for_each_safe(pos, temp, &sctp_local_addr_list) {
225 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
226 list_del(pos);
227 kfree(addr);
228 }
229}
230
231void sctp_local_addr_free(struct rcu_head *head)
232{
233 struct sctp_sockaddr_entry *e = container_of(head,
234 struct sctp_sockaddr_entry, rcu);
235 kfree(e);
236}
237
238
239int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
240 gfp_t gfp, int copy_flags)
241{
242 struct sctp_sockaddr_entry *addr;
243 int error = 0;
244
245 rcu_read_lock();
246 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
247 if (!addr->valid)
248 continue;
249 if (sctp_in_scope(&addr->a, scope)) {
250
251
252
253
254 if ((((AF_INET == addr->a.sa.sa_family) &&
255 (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
256 (((AF_INET6 == addr->a.sa.sa_family) &&
257 (copy_flags & SCTP_ADDR6_ALLOWED) &&
258 (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
259 error = sctp_add_bind_addr(bp, &addr->a,
260 SCTP_ADDR_SRC, GFP_ATOMIC);
261 if (error)
262 goto end_copy;
263 }
264 }
265 }
266
267end_copy:
268 rcu_read_unlock();
269 return error;
270}
271
272
273static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
274 int is_saddr)
275{
276 void *from;
277 __be16 *port;
278 struct sctphdr *sh;
279
280 port = &addr->v4.sin_port;
281 addr->v4.sin_family = AF_INET;
282
283 sh = sctp_hdr(skb);
284 if (is_saddr) {
285 *port = sh->source;
286 from = &ip_hdr(skb)->saddr;
287 } else {
288 *port = sh->dest;
289 from = &ip_hdr(skb)->daddr;
290 }
291 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
292}
293
294
295static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
296{
297 addr->v4.sin_family = AF_INET;
298 addr->v4.sin_port = 0;
299 addr->v4.sin_addr.s_addr = inet_sk(sk)->rcv_saddr;
300}
301
302
303static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
304{
305 inet_sk(sk)->rcv_saddr = addr->v4.sin_addr.s_addr;
306}
307
308
309static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
310{
311 inet_sk(sk)->daddr = addr->v4.sin_addr.s_addr;
312}
313
314
315static void sctp_v4_from_addr_param(union sctp_addr *addr,
316 union sctp_addr_param *param,
317 __be16 port, int iif)
318{
319 addr->v4.sin_family = AF_INET;
320 addr->v4.sin_port = port;
321 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
322}
323
324
325
326
327static int sctp_v4_to_addr_param(const union sctp_addr *addr,
328 union sctp_addr_param *param)
329{
330 int length = sizeof(sctp_ipv4addr_param_t);
331
332 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
333 param->v4.param_hdr.length = htons(length);
334 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
335
336 return length;
337}
338
339
340static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst,
341 __be16 port)
342{
343 struct rtable *rt = (struct rtable *)dst;
344 saddr->v4.sin_family = AF_INET;
345 saddr->v4.sin_port = port;
346 saddr->v4.sin_addr.s_addr = rt->rt_src;
347}
348
349
350static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
351 const union sctp_addr *addr2)
352{
353 if (addr1->sa.sa_family != addr2->sa.sa_family)
354 return 0;
355 if (addr1->v4.sin_port != addr2->v4.sin_port)
356 return 0;
357 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
358 return 0;
359
360 return 1;
361}
362
363
364static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
365{
366 addr->v4.sin_family = AF_INET;
367 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
368 addr->v4.sin_port = port;
369}
370
371
372static int sctp_v4_is_any(const union sctp_addr *addr)
373{
374 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
375}
376
377
378
379
380
381
382
383
384static int sctp_v4_addr_valid(union sctp_addr *addr,
385 struct sctp_sock *sp,
386 const struct sk_buff *skb)
387{
388
389 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
390 return 0;
391
392
393 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
394 return 0;
395
396
397 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
398 return 0;
399
400 return 1;
401}
402
403
404static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
405{
406 int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr);
407
408
409 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
410 ret != RTN_LOCAL &&
411 !sp->inet.freebind &&
412 !sysctl_ip_nonlocal_bind)
413 return 0;
414
415 if (ipv6_only_sock(sctp_opt2sk(sp)))
416 return 0;
417
418 return 1;
419}
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
439{
440 sctp_scope_t retval;
441
442
443 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
444 retval = SCTP_SCOPE_UNUSABLE;
445 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
446 retval = SCTP_SCOPE_LOOPBACK;
447 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
448 retval = SCTP_SCOPE_LINK;
449 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
450 ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
451 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
452 retval = SCTP_SCOPE_PRIVATE;
453 } else {
454 retval = SCTP_SCOPE_GLOBAL;
455 }
456
457 return retval;
458}
459
460
461
462
463
464static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc,
465 union sctp_addr *daddr,
466 union sctp_addr *saddr)
467{
468 struct rtable *rt;
469 struct flowi fl;
470 struct sctp_bind_addr *bp;
471 struct sctp_sockaddr_entry *laddr;
472 struct dst_entry *dst = NULL;
473 union sctp_addr dst_saddr;
474
475 memset(&fl, 0x0, sizeof(struct flowi));
476 fl.fl4_dst = daddr->v4.sin_addr.s_addr;
477 fl.proto = IPPROTO_SCTP;
478 if (asoc) {
479 fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk);
480 fl.oif = asoc->base.sk->sk_bound_dev_if;
481 }
482 if (saddr)
483 fl.fl4_src = saddr->v4.sin_addr.s_addr;
484
485 SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ",
486 __func__, &fl.fl4_dst, &fl.fl4_src);
487
488 if (!ip_route_output_key(&init_net, &rt, &fl)) {
489 dst = &rt->u.dst;
490 }
491
492
493
494
495 if (!asoc || saddr)
496 goto out;
497
498 bp = &asoc->base.bind_addr;
499
500 if (dst) {
501
502
503
504 sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port));
505 rcu_read_lock();
506 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
507 if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC))
508 continue;
509 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
510 goto out_unlock;
511 }
512 rcu_read_unlock();
513
514
515
516
517 dst_release(dst);
518 dst = NULL;
519 }
520
521
522
523
524 rcu_read_lock();
525 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
526 if (!laddr->valid)
527 continue;
528 if ((laddr->state == SCTP_ADDR_SRC) &&
529 (AF_INET == laddr->a.sa.sa_family)) {
530 fl.fl4_src = laddr->a.v4.sin_addr.s_addr;
531 if (!ip_route_output_key(&init_net, &rt, &fl)) {
532 dst = &rt->u.dst;
533 goto out_unlock;
534 }
535 }
536 }
537
538out_unlock:
539 rcu_read_unlock();
540out:
541 if (dst)
542 SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n",
543 &rt->rt_dst, &rt->rt_src);
544 else
545 SCTP_DEBUG_PRINTK("NO ROUTE\n");
546
547 return dst;
548}
549
550
551
552
553static void sctp_v4_get_saddr(struct sctp_sock *sk,
554 struct sctp_association *asoc,
555 struct dst_entry *dst,
556 union sctp_addr *daddr,
557 union sctp_addr *saddr)
558{
559 struct rtable *rt = (struct rtable *)dst;
560
561 if (!asoc)
562 return;
563
564 if (rt) {
565 saddr->v4.sin_family = AF_INET;
566 saddr->v4.sin_port = htons(asoc->base.bind_addr.port);
567 saddr->v4.sin_addr.s_addr = rt->rt_src;
568 }
569}
570
571
572static int sctp_v4_skb_iif(const struct sk_buff *skb)
573{
574 return skb_rtable(skb)->rt_iif;
575}
576
577
578static int sctp_v4_is_ce(const struct sk_buff *skb)
579{
580 return INET_ECN_is_ce(ip_hdr(skb)->tos);
581}
582
583
584static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
585 struct sctp_association *asoc)
586{
587 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
588 sk->sk_prot);
589 struct inet_sock *newinet;
590
591 if (!newsk)
592 goto out;
593
594 sock_init_data(NULL, newsk);
595
596 sctp_copy_sock(newsk, sk, asoc);
597 sock_reset_flag(newsk, SOCK_ZAPPED);
598
599 newinet = inet_sk(newsk);
600
601 newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
602
603 sk_refcnt_debug_inc(newsk);
604
605 if (newsk->sk_prot->init(newsk)) {
606 sk_common_release(newsk);
607 newsk = NULL;
608 }
609
610out:
611 return newsk;
612}
613
614
615static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
616{
617
618}
619
620
621static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
622{
623 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
624}
625
626static void sctp_v4_ecn_capable(struct sock *sk)
627{
628 INET_ECN_xmit(sk);
629}
630
631
632
633
634
635
636
637static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
638 void *ptr)
639{
640 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
641 struct sctp_sockaddr_entry *addr = NULL;
642 struct sctp_sockaddr_entry *temp;
643 int found = 0;
644
645 if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net))
646 return NOTIFY_DONE;
647
648 switch (ev) {
649 case NETDEV_UP:
650 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
651 if (addr) {
652 addr->a.v4.sin_family = AF_INET;
653 addr->a.v4.sin_port = 0;
654 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
655 addr->valid = 1;
656 spin_lock_bh(&sctp_local_addr_lock);
657 list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
658 spin_unlock_bh(&sctp_local_addr_lock);
659 }
660 break;
661 case NETDEV_DOWN:
662 spin_lock_bh(&sctp_local_addr_lock);
663 list_for_each_entry_safe(addr, temp,
664 &sctp_local_addr_list, list) {
665 if (addr->a.sa.sa_family == AF_INET &&
666 addr->a.v4.sin_addr.s_addr ==
667 ifa->ifa_local) {
668 found = 1;
669 addr->valid = 0;
670 list_del_rcu(&addr->list);
671 break;
672 }
673 }
674 spin_unlock_bh(&sctp_local_addr_lock);
675 if (found)
676 call_rcu(&addr->rcu, sctp_local_addr_free);
677 break;
678 }
679
680 return NOTIFY_DONE;
681}
682
683
684
685
686
687static int sctp_ctl_sock_init(void)
688{
689 int err;
690 sa_family_t family = PF_INET;
691
692 if (sctp_get_pf_specific(PF_INET6))
693 family = PF_INET6;
694
695 err = inet_ctl_sock_create(&sctp_ctl_sock, family,
696 SOCK_SEQPACKET, IPPROTO_SCTP, &init_net);
697
698
699 if (err < 0 && family == PF_INET6)
700 err = inet_ctl_sock_create(&sctp_ctl_sock, AF_INET,
701 SOCK_SEQPACKET, IPPROTO_SCTP,
702 &init_net);
703
704 if (err < 0) {
705 printk(KERN_ERR
706 "SCTP: Failed to create the SCTP control socket.\n");
707 return err;
708 }
709 return 0;
710}
711
712
713int sctp_register_af(struct sctp_af *af)
714{
715 switch (af->sa_family) {
716 case AF_INET:
717 if (sctp_af_v4_specific)
718 return 0;
719 sctp_af_v4_specific = af;
720 break;
721 case AF_INET6:
722 if (sctp_af_v6_specific)
723 return 0;
724 sctp_af_v6_specific = af;
725 break;
726 default:
727 return 0;
728 }
729
730 INIT_LIST_HEAD(&af->list);
731 list_add_tail(&af->list, &sctp_address_families);
732 return 1;
733}
734
735
736
737
738struct sctp_af *sctp_get_af_specific(sa_family_t family)
739{
740 switch (family) {
741 case AF_INET:
742 return sctp_af_v4_specific;
743 case AF_INET6:
744 return sctp_af_v6_specific;
745 default:
746 return NULL;
747 }
748}
749
750
751static void sctp_inet_msgname(char *msgname, int *addr_len)
752{
753 struct sockaddr_in *sin;
754
755 sin = (struct sockaddr_in *)msgname;
756 *addr_len = sizeof(struct sockaddr_in);
757 sin->sin_family = AF_INET;
758 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
759}
760
761
762static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
763 int *addr_len)
764{
765 struct sockaddr_in *sin, *sinfrom;
766
767 if (msgname) {
768 struct sctp_association *asoc;
769
770 asoc = event->asoc;
771 sctp_inet_msgname(msgname, addr_len);
772 sin = (struct sockaddr_in *)msgname;
773 sinfrom = &asoc->peer.primary_addr.v4;
774 sin->sin_port = htons(asoc->peer.port);
775 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
776 }
777}
778
779
780static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
781{
782 if (msgname) {
783 struct sctphdr *sh = sctp_hdr(skb);
784 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
785
786 sctp_inet_msgname(msgname, len);
787 sin->sin_port = sh->source;
788 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
789 }
790}
791
792
793static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
794{
795
796 return (AF_INET == family);
797}
798
799
800static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
801 const union sctp_addr *addr2,
802 struct sctp_sock *opt)
803{
804
805 if (addr1->sa.sa_family != addr2->sa.sa_family)
806 return 0;
807 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
808 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
809 return 1;
810 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
811 return 1;
812
813 return 0;
814}
815
816
817
818
819static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
820{
821 return sctp_v4_available(addr, opt);
822}
823
824
825
826
827static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
828{
829 return 1;
830}
831
832
833
834
835static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
836 __be16 *types)
837{
838 types[0] = SCTP_PARAM_IPV4_ADDRESS;
839 return 1;
840}
841
842
843static inline int sctp_v4_xmit(struct sk_buff *skb,
844 struct sctp_transport *transport)
845{
846 struct inet_sock *inet = inet_sk(skb->sk);
847
848 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n",
849 __func__, skb, skb->len,
850 &skb_rtable(skb)->rt_src,
851 &skb_rtable(skb)->rt_dst);
852
853 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
854 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
855
856 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
857 return ip_queue_xmit(skb, 0);
858}
859
860static struct sctp_af sctp_af_inet;
861
862static struct sctp_pf sctp_pf_inet = {
863 .event_msgname = sctp_inet_event_msgname,
864 .skb_msgname = sctp_inet_skb_msgname,
865 .af_supported = sctp_inet_af_supported,
866 .cmp_addr = sctp_inet_cmp_addr,
867 .bind_verify = sctp_inet_bind_verify,
868 .send_verify = sctp_inet_send_verify,
869 .supported_addrs = sctp_inet_supported_addrs,
870 .create_accept_sk = sctp_v4_create_accept_sk,
871 .addr_v4map = sctp_v4_addr_v4map,
872 .af = &sctp_af_inet
873};
874
875
876static struct notifier_block sctp_inetaddr_notifier = {
877 .notifier_call = sctp_inetaddr_event,
878};
879
880
881static const struct proto_ops inet_seqpacket_ops = {
882 .family = PF_INET,
883 .owner = THIS_MODULE,
884 .release = inet_release,
885 .bind = inet_bind,
886 .connect = inet_dgram_connect,
887 .socketpair = sock_no_socketpair,
888 .accept = inet_accept,
889 .getname = inet_getname,
890 .poll = sctp_poll,
891 .ioctl = inet_ioctl,
892 .listen = sctp_inet_listen,
893 .shutdown = inet_shutdown,
894 .setsockopt = sock_common_setsockopt,
895 .getsockopt = sock_common_getsockopt,
896 .sendmsg = inet_sendmsg,
897 .recvmsg = sock_common_recvmsg,
898 .mmap = sock_no_mmap,
899 .sendpage = sock_no_sendpage,
900#ifdef CONFIG_COMPAT
901 .compat_setsockopt = compat_sock_common_setsockopt,
902 .compat_getsockopt = compat_sock_common_getsockopt,
903#endif
904};
905
906
907static struct inet_protosw sctp_seqpacket_protosw = {
908 .type = SOCK_SEQPACKET,
909 .protocol = IPPROTO_SCTP,
910 .prot = &sctp_prot,
911 .ops = &inet_seqpacket_ops,
912 .capability = -1,
913 .no_check = 0,
914 .flags = SCTP_PROTOSW_FLAG
915};
916static struct inet_protosw sctp_stream_protosw = {
917 .type = SOCK_STREAM,
918 .protocol = IPPROTO_SCTP,
919 .prot = &sctp_prot,
920 .ops = &inet_seqpacket_ops,
921 .capability = -1,
922 .no_check = 0,
923 .flags = SCTP_PROTOSW_FLAG
924};
925
926
927static const struct net_protocol sctp_protocol = {
928 .handler = sctp_rcv,
929 .err_handler = sctp_v4_err,
930 .no_policy = 1,
931};
932
933
934static struct sctp_af sctp_af_inet = {
935 .sa_family = AF_INET,
936 .sctp_xmit = sctp_v4_xmit,
937 .setsockopt = ip_setsockopt,
938 .getsockopt = ip_getsockopt,
939 .get_dst = sctp_v4_get_dst,
940 .get_saddr = sctp_v4_get_saddr,
941 .copy_addrlist = sctp_v4_copy_addrlist,
942 .from_skb = sctp_v4_from_skb,
943 .from_sk = sctp_v4_from_sk,
944 .to_sk_saddr = sctp_v4_to_sk_saddr,
945 .to_sk_daddr = sctp_v4_to_sk_daddr,
946 .from_addr_param = sctp_v4_from_addr_param,
947 .to_addr_param = sctp_v4_to_addr_param,
948 .dst_saddr = sctp_v4_dst_saddr,
949 .cmp_addr = sctp_v4_cmp_addr,
950 .addr_valid = sctp_v4_addr_valid,
951 .inaddr_any = sctp_v4_inaddr_any,
952 .is_any = sctp_v4_is_any,
953 .available = sctp_v4_available,
954 .scope = sctp_v4_scope,
955 .skb_iif = sctp_v4_skb_iif,
956 .is_ce = sctp_v4_is_ce,
957 .seq_dump_addr = sctp_v4_seq_dump_addr,
958 .ecn_capable = sctp_v4_ecn_capable,
959 .net_header_len = sizeof(struct iphdr),
960 .sockaddr_len = sizeof(struct sockaddr_in),
961#ifdef CONFIG_COMPAT
962 .compat_setsockopt = compat_ip_setsockopt,
963 .compat_getsockopt = compat_ip_getsockopt,
964#endif
965};
966
967struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
968
969 switch (family) {
970 case PF_INET:
971 return sctp_pf_inet_specific;
972 case PF_INET6:
973 return sctp_pf_inet6_specific;
974 default:
975 return NULL;
976 }
977}
978
979
980int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
981{
982 switch (family) {
983 case PF_INET:
984 if (sctp_pf_inet_specific)
985 return 0;
986 sctp_pf_inet_specific = pf;
987 break;
988 case PF_INET6:
989 if (sctp_pf_inet6_specific)
990 return 0;
991 sctp_pf_inet6_specific = pf;
992 break;
993 default:
994 return 0;
995 }
996 return 1;
997}
998
999static inline int init_sctp_mibs(void)
1000{
1001 return snmp_mib_init((void**)sctp_statistics, sizeof(struct sctp_mib));
1002}
1003
1004static inline void cleanup_sctp_mibs(void)
1005{
1006 snmp_mib_free((void**)sctp_statistics);
1007}
1008
1009static void sctp_v4_pf_init(void)
1010{
1011
1012 sctp_register_pf(&sctp_pf_inet, PF_INET);
1013 sctp_register_af(&sctp_af_inet);
1014}
1015
1016static void sctp_v4_pf_exit(void)
1017{
1018 list_del(&sctp_af_inet.list);
1019}
1020
1021static int sctp_v4_protosw_init(void)
1022{
1023 int rc;
1024
1025 rc = proto_register(&sctp_prot, 1);
1026 if (rc)
1027 return rc;
1028
1029
1030 inet_register_protosw(&sctp_seqpacket_protosw);
1031 inet_register_protosw(&sctp_stream_protosw);
1032
1033 return 0;
1034}
1035
1036static void sctp_v4_protosw_exit(void)
1037{
1038 inet_unregister_protosw(&sctp_stream_protosw);
1039 inet_unregister_protosw(&sctp_seqpacket_protosw);
1040 proto_unregister(&sctp_prot);
1041}
1042
1043static int sctp_v4_add_protocol(void)
1044{
1045
1046 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1047
1048
1049 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1050 return -EAGAIN;
1051
1052 return 0;
1053}
1054
1055static void sctp_v4_del_protocol(void)
1056{
1057 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1058 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1059}
1060
1061
1062SCTP_STATIC __init int sctp_init(void)
1063{
1064 int i;
1065 int status = -EINVAL;
1066 unsigned long goal;
1067 unsigned long limit;
1068 unsigned long nr_pages;
1069 int max_share;
1070 int order;
1071
1072
1073 if (!sctp_sanity_check())
1074 goto out;
1075
1076
1077 status = -ENOBUFS;
1078 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1079 sizeof(struct sctp_bind_bucket),
1080 0, SLAB_HWCACHE_ALIGN,
1081 NULL);
1082 if (!sctp_bucket_cachep)
1083 goto out;
1084
1085 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1086 sizeof(struct sctp_chunk),
1087 0, SLAB_HWCACHE_ALIGN,
1088 NULL);
1089 if (!sctp_chunk_cachep)
1090 goto err_chunk_cachep;
1091
1092
1093 status = init_sctp_mibs();
1094 if (status)
1095 goto err_init_mibs;
1096
1097
1098 status = sctp_proc_init();
1099 if (status)
1100 goto err_init_proc;
1101
1102
1103 sctp_dbg_objcnt_init();
1104
1105
1106
1107
1108
1109
1110 sctp_rto_initial = SCTP_RTO_INITIAL;
1111
1112 sctp_rto_min = SCTP_RTO_MIN;
1113
1114 sctp_rto_max = SCTP_RTO_MAX;
1115
1116 sctp_rto_alpha = SCTP_RTO_ALPHA;
1117
1118 sctp_rto_beta = SCTP_RTO_BETA;
1119
1120
1121 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
1122
1123
1124 sctp_cookie_preserve_enable = 1;
1125
1126
1127 sctp_max_burst = SCTP_DEFAULT_MAX_BURST;
1128
1129
1130
1131
1132
1133 sctp_max_retrans_association = 10;
1134 sctp_max_retrans_path = 5;
1135 sctp_max_retrans_init = 8;
1136
1137
1138 sctp_sndbuf_policy = 0;
1139
1140
1141 sctp_rcvbuf_policy = 0;
1142
1143
1144 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1145
1146
1147 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
1148
1149
1150
1151
1152 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1153 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1154
1155
1156 idr_init(&sctp_assocs_id);
1157
1158
1159
1160
1161
1162
1163
1164 nr_pages = totalram_pages - totalhigh_pages;
1165 limit = min(nr_pages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT);
1166 limit = (limit * (nr_pages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11);
1167 limit = max(limit, 128UL);
1168 sysctl_sctp_mem[0] = limit / 4 * 3;
1169 sysctl_sctp_mem[1] = limit;
1170 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1171
1172
1173 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1174 max_share = min(4UL*1024*1024, limit);
1175
1176 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM;
1177 sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1));
1178 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1179
1180 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1181 sysctl_sctp_wmem[1] = 16*1024;
1182 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1183
1184
1185
1186
1187 if (totalram_pages >= (128 * 1024))
1188 goal = totalram_pages >> (22 - PAGE_SHIFT);
1189 else
1190 goal = totalram_pages >> (24 - PAGE_SHIFT);
1191
1192 for (order = 0; (1UL << order) < goal; order++)
1193 ;
1194
1195 do {
1196 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1197 sizeof(struct sctp_hashbucket);
1198 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1199 continue;
1200 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1201 __get_free_pages(GFP_ATOMIC, order);
1202 } while (!sctp_assoc_hashtable && --order > 0);
1203 if (!sctp_assoc_hashtable) {
1204 printk(KERN_ERR "SCTP: Failed association hash alloc.\n");
1205 status = -ENOMEM;
1206 goto err_ahash_alloc;
1207 }
1208 for (i = 0; i < sctp_assoc_hashsize; i++) {
1209 rwlock_init(&sctp_assoc_hashtable[i].lock);
1210 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
1211 }
1212
1213
1214 sctp_ep_hashsize = 64;
1215 sctp_ep_hashtable = (struct sctp_hashbucket *)
1216 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1217 if (!sctp_ep_hashtable) {
1218 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n");
1219 status = -ENOMEM;
1220 goto err_ehash_alloc;
1221 }
1222 for (i = 0; i < sctp_ep_hashsize; i++) {
1223 rwlock_init(&sctp_ep_hashtable[i].lock);
1224 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1225 }
1226
1227
1228 do {
1229 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1230 sizeof(struct sctp_bind_hashbucket);
1231 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1232 continue;
1233 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1234 __get_free_pages(GFP_ATOMIC, order);
1235 } while (!sctp_port_hashtable && --order > 0);
1236 if (!sctp_port_hashtable) {
1237 printk(KERN_ERR "SCTP: Failed bind hash alloc.");
1238 status = -ENOMEM;
1239 goto err_bhash_alloc;
1240 }
1241 for (i = 0; i < sctp_port_hashsize; i++) {
1242 spin_lock_init(&sctp_port_hashtable[i].lock);
1243 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1244 }
1245
1246 printk(KERN_INFO "SCTP: Hash tables configured "
1247 "(established %d bind %d)\n",
1248 sctp_assoc_hashsize, sctp_port_hashsize);
1249
1250
1251 sctp_addip_enable = 0;
1252 sctp_addip_noauth = 0;
1253
1254
1255 sctp_prsctp_enable = 1;
1256
1257
1258 sctp_auth_enable = 0;
1259
1260
1261 sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1262
1263 sctp_sysctl_register();
1264
1265 INIT_LIST_HEAD(&sctp_address_families);
1266 sctp_v4_pf_init();
1267 sctp_v6_pf_init();
1268
1269
1270 INIT_LIST_HEAD(&sctp_local_addr_list);
1271 spin_lock_init(&sctp_local_addr_lock);
1272 sctp_get_local_addr_list();
1273
1274 status = sctp_v4_protosw_init();
1275
1276 if (status)
1277 goto err_protosw_init;
1278
1279 status = sctp_v6_protosw_init();
1280 if (status)
1281 goto err_v6_protosw_init;
1282
1283
1284 if ((status = sctp_ctl_sock_init())) {
1285 printk (KERN_ERR
1286 "SCTP: Failed to initialize the SCTP control sock.\n");
1287 goto err_ctl_sock_init;
1288 }
1289
1290 status = sctp_v4_add_protocol();
1291 if (status)
1292 goto err_add_protocol;
1293
1294
1295 status = sctp_v6_add_protocol();
1296 if (status)
1297 goto err_v6_add_protocol;
1298
1299 status = 0;
1300out:
1301 return status;
1302err_v6_add_protocol:
1303 sctp_v4_del_protocol();
1304err_add_protocol:
1305 inet_ctl_sock_destroy(sctp_ctl_sock);
1306err_ctl_sock_init:
1307 sctp_v6_protosw_exit();
1308err_v6_protosw_init:
1309 sctp_v4_protosw_exit();
1310err_protosw_init:
1311 sctp_free_local_addr_list();
1312 sctp_v4_pf_exit();
1313 sctp_v6_pf_exit();
1314 sctp_sysctl_unregister();
1315 free_pages((unsigned long)sctp_port_hashtable,
1316 get_order(sctp_port_hashsize *
1317 sizeof(struct sctp_bind_hashbucket)));
1318err_bhash_alloc:
1319 kfree(sctp_ep_hashtable);
1320err_ehash_alloc:
1321 free_pages((unsigned long)sctp_assoc_hashtable,
1322 get_order(sctp_assoc_hashsize *
1323 sizeof(struct sctp_hashbucket)));
1324err_ahash_alloc:
1325 sctp_dbg_objcnt_exit();
1326 sctp_proc_exit();
1327err_init_proc:
1328 cleanup_sctp_mibs();
1329err_init_mibs:
1330 kmem_cache_destroy(sctp_chunk_cachep);
1331err_chunk_cachep:
1332 kmem_cache_destroy(sctp_bucket_cachep);
1333 goto out;
1334}
1335
1336
1337SCTP_STATIC __exit void sctp_exit(void)
1338{
1339
1340
1341
1342
1343
1344 sctp_v6_del_protocol();
1345 sctp_v4_del_protocol();
1346
1347
1348 inet_ctl_sock_destroy(sctp_ctl_sock);
1349
1350
1351 sctp_v6_protosw_exit();
1352 sctp_v4_protosw_exit();
1353
1354
1355 sctp_free_local_addr_list();
1356
1357
1358 sctp_v6_pf_exit();
1359 sctp_v4_pf_exit();
1360
1361 sctp_sysctl_unregister();
1362
1363 free_pages((unsigned long)sctp_assoc_hashtable,
1364 get_order(sctp_assoc_hashsize *
1365 sizeof(struct sctp_hashbucket)));
1366 kfree(sctp_ep_hashtable);
1367 free_pages((unsigned long)sctp_port_hashtable,
1368 get_order(sctp_port_hashsize *
1369 sizeof(struct sctp_bind_hashbucket)));
1370
1371 sctp_dbg_objcnt_exit();
1372 sctp_proc_exit();
1373 cleanup_sctp_mibs();
1374
1375 rcu_barrier();
1376
1377 kmem_cache_destroy(sctp_chunk_cachep);
1378 kmem_cache_destroy(sctp_bucket_cachep);
1379}
1380
1381module_init(sctp_init);
1382module_exit(sctp_exit);
1383
1384
1385
1386
1387MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1388MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1389MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1390MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1391module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1392MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1393MODULE_LICENSE("GPL");
1394