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48
49#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
50
51#include <linux/module.h>
52#include <linux/init.h>
53#include <linux/netdevice.h>
54#include <linux/inetdevice.h>
55#include <linux/seq_file.h>
56#include <linux/bootmem.h>
57#include <linux/highmem.h>
58#include <linux/swap.h>
59#include <linux/slab.h>
60#include <net/net_namespace.h>
61#include <net/protocol.h>
62#include <net/ip.h>
63#include <net/ipv6.h>
64#include <net/route.h>
65#include <net/sctp/sctp.h>
66#include <net/addrconf.h>
67#include <net/inet_common.h>
68#include <net/inet_ecn.h>
69
70
71struct sctp_globals sctp_globals __read_mostly;
72DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly;
73
74#ifdef CONFIG_PROC_FS
75struct proc_dir_entry *proc_net_sctp;
76#endif
77
78struct idr sctp_assocs_id;
79DEFINE_SPINLOCK(sctp_assocs_id_lock);
80
81
82
83
84
85static struct sock *sctp_ctl_sock;
86
87static struct sctp_pf *sctp_pf_inet6_specific;
88static struct sctp_pf *sctp_pf_inet_specific;
89static struct sctp_af *sctp_af_v4_specific;
90static struct sctp_af *sctp_af_v6_specific;
91
92struct kmem_cache *sctp_chunk_cachep __read_mostly;
93struct kmem_cache *sctp_bucket_cachep __read_mostly;
94
95long sysctl_sctp_mem[3];
96int sysctl_sctp_rmem[3];
97int sysctl_sctp_wmem[3];
98
99
100struct sock *sctp_get_ctl_sock(void)
101{
102 return sctp_ctl_sock;
103}
104
105
106static __init int sctp_proc_init(void)
107{
108 if (percpu_counter_init(&sctp_sockets_allocated, 0))
109 goto out_nomem;
110#ifdef CONFIG_PROC_FS
111 if (!proc_net_sctp) {
112 proc_net_sctp = proc_mkdir("sctp", init_net.proc_net);
113 if (!proc_net_sctp)
114 goto out_free_percpu;
115 }
116
117 if (sctp_snmp_proc_init())
118 goto out_snmp_proc_init;
119 if (sctp_eps_proc_init())
120 goto out_eps_proc_init;
121 if (sctp_assocs_proc_init())
122 goto out_assocs_proc_init;
123 if (sctp_remaddr_proc_init())
124 goto out_remaddr_proc_init;
125
126 return 0;
127
128out_remaddr_proc_init:
129 sctp_assocs_proc_exit();
130out_assocs_proc_init:
131 sctp_eps_proc_exit();
132out_eps_proc_init:
133 sctp_snmp_proc_exit();
134out_snmp_proc_init:
135 if (proc_net_sctp) {
136 proc_net_sctp = NULL;
137 remove_proc_entry("sctp", init_net.proc_net);
138 }
139out_free_percpu:
140 percpu_counter_destroy(&sctp_sockets_allocated);
141#else
142 return 0;
143#endif
144
145out_nomem:
146 return -ENOMEM;
147}
148
149
150
151
152
153static void sctp_proc_exit(void)
154{
155#ifdef CONFIG_PROC_FS
156 sctp_snmp_proc_exit();
157 sctp_eps_proc_exit();
158 sctp_assocs_proc_exit();
159 sctp_remaddr_proc_exit();
160
161 if (proc_net_sctp) {
162 proc_net_sctp = NULL;
163 remove_proc_entry("sctp", init_net.proc_net);
164 }
165#endif
166 percpu_counter_destroy(&sctp_sockets_allocated);
167}
168
169
170
171
172static void sctp_v4_copy_addrlist(struct list_head *addrlist,
173 struct net_device *dev)
174{
175 struct in_device *in_dev;
176 struct in_ifaddr *ifa;
177 struct sctp_sockaddr_entry *addr;
178
179 rcu_read_lock();
180 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
181 rcu_read_unlock();
182 return;
183 }
184
185 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
186
187 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
188 if (addr) {
189 addr->a.v4.sin_family = AF_INET;
190 addr->a.v4.sin_port = 0;
191 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
192 addr->valid = 1;
193 INIT_LIST_HEAD(&addr->list);
194 list_add_tail(&addr->list, addrlist);
195 }
196 }
197
198 rcu_read_unlock();
199}
200
201
202
203
204static void sctp_get_local_addr_list(void)
205{
206 struct net_device *dev;
207 struct list_head *pos;
208 struct sctp_af *af;
209
210 rcu_read_lock();
211 for_each_netdev_rcu(&init_net, dev) {
212 __list_for_each(pos, &sctp_address_families) {
213 af = list_entry(pos, struct sctp_af, list);
214 af->copy_addrlist(&sctp_local_addr_list, dev);
215 }
216 }
217 rcu_read_unlock();
218}
219
220
221static void sctp_free_local_addr_list(void)
222{
223 struct sctp_sockaddr_entry *addr;
224 struct list_head *pos, *temp;
225
226 list_for_each_safe(pos, temp, &sctp_local_addr_list) {
227 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
228 list_del(pos);
229 kfree(addr);
230 }
231}
232
233
234int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
235 gfp_t gfp, int copy_flags)
236{
237 struct sctp_sockaddr_entry *addr;
238 int error = 0;
239
240 rcu_read_lock();
241 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
242 if (!addr->valid)
243 continue;
244 if (sctp_in_scope(&addr->a, scope)) {
245
246
247
248
249 if ((((AF_INET == addr->a.sa.sa_family) &&
250 (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
251 (((AF_INET6 == addr->a.sa.sa_family) &&
252 (copy_flags & SCTP_ADDR6_ALLOWED) &&
253 (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
254 error = sctp_add_bind_addr(bp, &addr->a,
255 SCTP_ADDR_SRC, GFP_ATOMIC);
256 if (error)
257 goto end_copy;
258 }
259 }
260 }
261
262end_copy:
263 rcu_read_unlock();
264 return error;
265}
266
267
268static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
269 int is_saddr)
270{
271 void *from;
272 __be16 *port;
273 struct sctphdr *sh;
274
275 port = &addr->v4.sin_port;
276 addr->v4.sin_family = AF_INET;
277
278 sh = sctp_hdr(skb);
279 if (is_saddr) {
280 *port = sh->source;
281 from = &ip_hdr(skb)->saddr;
282 } else {
283 *port = sh->dest;
284 from = &ip_hdr(skb)->daddr;
285 }
286 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
287}
288
289
290static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
291{
292 addr->v4.sin_family = AF_INET;
293 addr->v4.sin_port = 0;
294 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
295}
296
297
298static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
299{
300 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
301}
302
303
304static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
305{
306 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
307}
308
309
310static void sctp_v4_from_addr_param(union sctp_addr *addr,
311 union sctp_addr_param *param,
312 __be16 port, int iif)
313{
314 addr->v4.sin_family = AF_INET;
315 addr->v4.sin_port = port;
316 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
317}
318
319
320
321
322static int sctp_v4_to_addr_param(const union sctp_addr *addr,
323 union sctp_addr_param *param)
324{
325 int length = sizeof(sctp_ipv4addr_param_t);
326
327 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
328 param->v4.param_hdr.length = htons(length);
329 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
330
331 return length;
332}
333
334
335static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
336 __be16 port)
337{
338 saddr->v4.sin_family = AF_INET;
339 saddr->v4.sin_port = port;
340 saddr->v4.sin_addr.s_addr = fl4->saddr;
341}
342
343
344static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
345 const union sctp_addr *addr2)
346{
347 if (addr1->sa.sa_family != addr2->sa.sa_family)
348 return 0;
349 if (addr1->v4.sin_port != addr2->v4.sin_port)
350 return 0;
351 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
352 return 0;
353
354 return 1;
355}
356
357
358static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
359{
360 addr->v4.sin_family = AF_INET;
361 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
362 addr->v4.sin_port = port;
363}
364
365
366static int sctp_v4_is_any(const union sctp_addr *addr)
367{
368 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
369}
370
371
372
373
374
375
376
377
378static int sctp_v4_addr_valid(union sctp_addr *addr,
379 struct sctp_sock *sp,
380 const struct sk_buff *skb)
381{
382
383 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
384 return 0;
385
386
387 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
388 return 0;
389
390
391 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
392 return 0;
393
394 return 1;
395}
396
397
398static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
399{
400 int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr);
401
402
403 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
404 ret != RTN_LOCAL &&
405 !sp->inet.freebind &&
406 !sysctl_ip_nonlocal_bind)
407 return 0;
408
409 if (ipv6_only_sock(sctp_opt2sk(sp)))
410 return 0;
411
412 return 1;
413}
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
433{
434 sctp_scope_t retval;
435
436
437 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
438 retval = SCTP_SCOPE_UNUSABLE;
439 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
440 retval = SCTP_SCOPE_LOOPBACK;
441 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
442 retval = SCTP_SCOPE_LINK;
443 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
444 ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
445 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
446 retval = SCTP_SCOPE_PRIVATE;
447 } else {
448 retval = SCTP_SCOPE_GLOBAL;
449 }
450
451 return retval;
452}
453
454
455
456
457
458static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
459 struct flowi *fl, struct sock *sk)
460{
461 struct sctp_association *asoc = t->asoc;
462 struct rtable *rt;
463 struct flowi4 *fl4 = &fl->u.ip4;
464 struct sctp_bind_addr *bp;
465 struct sctp_sockaddr_entry *laddr;
466 struct dst_entry *dst = NULL;
467 union sctp_addr *daddr = &t->ipaddr;
468 union sctp_addr dst_saddr;
469
470 memset(fl4, 0x0, sizeof(struct flowi4));
471 fl4->daddr = daddr->v4.sin_addr.s_addr;
472 fl4->fl4_dport = daddr->v4.sin_port;
473 fl4->flowi4_proto = IPPROTO_SCTP;
474 if (asoc) {
475 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
476 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
477 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
478 }
479 if (saddr) {
480 fl4->saddr = saddr->v4.sin_addr.s_addr;
481 fl4->fl4_sport = saddr->v4.sin_port;
482 }
483
484 SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ",
485 __func__, &fl4->daddr, &fl4->saddr);
486
487 rt = ip_route_output_key(&init_net, fl4);
488 if (!IS_ERR(rt))
489 dst = &rt->dst;
490
491
492
493
494 if (!asoc || saddr)
495 goto out;
496
497 bp = &asoc->base.bind_addr;
498
499 if (dst) {
500
501
502
503 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
504 rcu_read_lock();
505 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
506 if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
507 (laddr->state != SCTP_ADDR_SRC &&
508 !asoc->src_out_of_asoc_ok))
509 continue;
510 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
511 goto out_unlock;
512 }
513 rcu_read_unlock();
514
515
516
517
518 dst_release(dst);
519 dst = NULL;
520 }
521
522
523
524
525 rcu_read_lock();
526 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
527 if (!laddr->valid)
528 continue;
529 if ((laddr->state == SCTP_ADDR_SRC) &&
530 (AF_INET == laddr->a.sa.sa_family)) {
531 fl4->saddr = laddr->a.v4.sin_addr.s_addr;
532 fl4->fl4_sport = laddr->a.v4.sin_port;
533 rt = ip_route_output_key(&init_net, fl4);
534 if (!IS_ERR(rt)) {
535 dst = &rt->dst;
536 goto out_unlock;
537 }
538 }
539 }
540
541out_unlock:
542 rcu_read_unlock();
543out:
544 t->dst = dst;
545 if (dst)
546 SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n",
547 &fl4->daddr, &fl4->saddr);
548 else
549 SCTP_DEBUG_PRINTK("NO ROUTE\n");
550}
551
552
553
554
555static void sctp_v4_get_saddr(struct sctp_sock *sk,
556 struct sctp_transport *t,
557 struct flowi *fl)
558{
559 union sctp_addr *saddr = &t->saddr;
560 struct rtable *rt = (struct rtable *)t->dst;
561
562 if (rt) {
563 saddr->v4.sin_family = AF_INET;
564 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
565 }
566}
567
568
569static int sctp_v4_skb_iif(const struct sk_buff *skb)
570{
571 return skb_rtable(skb)->rt_iif;
572}
573
574
575static int sctp_v4_is_ce(const struct sk_buff *skb)
576{
577 return INET_ECN_is_ce(ip_hdr(skb)->tos);
578}
579
580
581static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
582 struct sctp_association *asoc)
583{
584 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
585 sk->sk_prot);
586 struct inet_sock *newinet;
587
588 if (!newsk)
589 goto out;
590
591 sock_init_data(NULL, newsk);
592
593 sctp_copy_sock(newsk, sk, asoc);
594 sock_reset_flag(newsk, SOCK_ZAPPED);
595
596 newinet = inet_sk(newsk);
597
598 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
599
600 sk_refcnt_debug_inc(newsk);
601
602 if (newsk->sk_prot->init(newsk)) {
603 sk_common_release(newsk);
604 newsk = NULL;
605 }
606
607out:
608 return newsk;
609}
610
611
612static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
613{
614
615}
616
617
618static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
619{
620 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
621}
622
623static void sctp_v4_ecn_capable(struct sock *sk)
624{
625 INET_ECN_xmit(sk);
626}
627
628void sctp_addr_wq_timeout_handler(unsigned long arg)
629{
630 struct sctp_sockaddr_entry *addrw, *temp;
631 struct sctp_sock *sp;
632
633 spin_lock_bh(&sctp_addr_wq_lock);
634
635 list_for_each_entry_safe(addrw, temp, &sctp_addr_waitq, list) {
636 SCTP_DEBUG_PRINTK_IPADDR("sctp_addrwq_timo_handler: the first ent in wq %p is ",
637 " for cmd %d at entry %p\n", &sctp_addr_waitq, &addrw->a, addrw->state,
638 addrw);
639
640#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
641
642
643 if (addrw->a.sa.sa_family == AF_INET6) {
644 struct in6_addr *in6;
645
646 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
647 IPV6_ADDR_LINKLOCAL)
648 goto free_next;
649
650 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
651 if (ipv6_chk_addr(&init_net, in6, NULL, 0) == 0 &&
652 addrw->state == SCTP_ADDR_NEW) {
653 unsigned long timeo_val;
654
655 SCTP_DEBUG_PRINTK("sctp_timo_handler: this is on DAD, trying %d sec later\n",
656 SCTP_ADDRESS_TICK_DELAY);
657 timeo_val = jiffies;
658 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
659 mod_timer(&sctp_addr_wq_timer, timeo_val);
660 break;
661 }
662 }
663#endif
664 list_for_each_entry(sp, &sctp_auto_asconf_splist, auto_asconf_list) {
665 struct sock *sk;
666
667 sk = sctp_opt2sk(sp);
668
669 if (!sctp_is_ep_boundall(sk))
670 continue;
671 sctp_bh_lock_sock(sk);
672 if (sctp_asconf_mgmt(sp, addrw) < 0)
673 SCTP_DEBUG_PRINTK("sctp_addrwq_timo_handler: sctp_asconf_mgmt failed\n");
674 sctp_bh_unlock_sock(sk);
675 }
676free_next:
677 list_del(&addrw->list);
678 kfree(addrw);
679 }
680 spin_unlock_bh(&sctp_addr_wq_lock);
681}
682
683static void sctp_free_addr_wq(void)
684{
685 struct sctp_sockaddr_entry *addrw;
686 struct sctp_sockaddr_entry *temp;
687
688 spin_lock_bh(&sctp_addr_wq_lock);
689 del_timer(&sctp_addr_wq_timer);
690 list_for_each_entry_safe(addrw, temp, &sctp_addr_waitq, list) {
691 list_del(&addrw->list);
692 kfree(addrw);
693 }
694 spin_unlock_bh(&sctp_addr_wq_lock);
695}
696
697
698
699
700static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct sctp_sockaddr_entry *addr)
701{
702 struct sctp_sockaddr_entry *addrw;
703
704 list_for_each_entry(addrw, &sctp_addr_waitq, list) {
705 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
706 continue;
707 if (addrw->a.sa.sa_family == AF_INET) {
708 if (addrw->a.v4.sin_addr.s_addr ==
709 addr->a.v4.sin_addr.s_addr)
710 return addrw;
711 } else if (addrw->a.sa.sa_family == AF_INET6) {
712 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
713 &addr->a.v6.sin6_addr))
714 return addrw;
715 }
716 }
717 return NULL;
718}
719
720void sctp_addr_wq_mgmt(struct sctp_sockaddr_entry *addr, int cmd)
721{
722 struct sctp_sockaddr_entry *addrw;
723 unsigned long timeo_val;
724
725
726
727
728
729
730
731 spin_lock_bh(&sctp_addr_wq_lock);
732
733 addrw = sctp_addr_wq_lookup(addr);
734 if (addrw) {
735 if (addrw->state != cmd) {
736 SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt offsets existing entry for %d ",
737 " in wq %p\n", addrw->state, &addrw->a,
738 &sctp_addr_waitq);
739 list_del(&addrw->list);
740 kfree(addrw);
741 }
742 spin_unlock_bh(&sctp_addr_wq_lock);
743 return;
744 }
745
746
747 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
748 if (addrw == NULL) {
749 spin_unlock_bh(&sctp_addr_wq_lock);
750 return;
751 }
752 addrw->state = cmd;
753 list_add_tail(&addrw->list, &sctp_addr_waitq);
754 SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt add new entry for cmd:%d ",
755 " in wq %p\n", addrw->state, &addrw->a, &sctp_addr_waitq);
756
757 if (!timer_pending(&sctp_addr_wq_timer)) {
758 timeo_val = jiffies;
759 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
760 mod_timer(&sctp_addr_wq_timer, timeo_val);
761 }
762 spin_unlock_bh(&sctp_addr_wq_lock);
763}
764
765
766
767
768
769
770
771static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
772 void *ptr)
773{
774 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
775 struct sctp_sockaddr_entry *addr = NULL;
776 struct sctp_sockaddr_entry *temp;
777 int found = 0;
778
779 if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net))
780 return NOTIFY_DONE;
781
782 switch (ev) {
783 case NETDEV_UP:
784 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
785 if (addr) {
786 addr->a.v4.sin_family = AF_INET;
787 addr->a.v4.sin_port = 0;
788 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
789 addr->valid = 1;
790 spin_lock_bh(&sctp_local_addr_lock);
791 list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
792 sctp_addr_wq_mgmt(addr, SCTP_ADDR_NEW);
793 spin_unlock_bh(&sctp_local_addr_lock);
794 }
795 break;
796 case NETDEV_DOWN:
797 spin_lock_bh(&sctp_local_addr_lock);
798 list_for_each_entry_safe(addr, temp,
799 &sctp_local_addr_list, list) {
800 if (addr->a.sa.sa_family == AF_INET &&
801 addr->a.v4.sin_addr.s_addr ==
802 ifa->ifa_local) {
803 sctp_addr_wq_mgmt(addr, SCTP_ADDR_DEL);
804 found = 1;
805 addr->valid = 0;
806 list_del_rcu(&addr->list);
807 break;
808 }
809 }
810 spin_unlock_bh(&sctp_local_addr_lock);
811 if (found)
812 kfree_rcu(addr, rcu);
813 break;
814 }
815
816 return NOTIFY_DONE;
817}
818
819
820
821
822
823static int sctp_ctl_sock_init(void)
824{
825 int err;
826 sa_family_t family = PF_INET;
827
828 if (sctp_get_pf_specific(PF_INET6))
829 family = PF_INET6;
830
831 err = inet_ctl_sock_create(&sctp_ctl_sock, family,
832 SOCK_SEQPACKET, IPPROTO_SCTP, &init_net);
833
834
835 if (err < 0 && family == PF_INET6)
836 err = inet_ctl_sock_create(&sctp_ctl_sock, AF_INET,
837 SOCK_SEQPACKET, IPPROTO_SCTP,
838 &init_net);
839
840 if (err < 0) {
841 pr_err("Failed to create the SCTP control socket\n");
842 return err;
843 }
844 return 0;
845}
846
847
848int sctp_register_af(struct sctp_af *af)
849{
850 switch (af->sa_family) {
851 case AF_INET:
852 if (sctp_af_v4_specific)
853 return 0;
854 sctp_af_v4_specific = af;
855 break;
856 case AF_INET6:
857 if (sctp_af_v6_specific)
858 return 0;
859 sctp_af_v6_specific = af;
860 break;
861 default:
862 return 0;
863 }
864
865 INIT_LIST_HEAD(&af->list);
866 list_add_tail(&af->list, &sctp_address_families);
867 return 1;
868}
869
870
871
872
873struct sctp_af *sctp_get_af_specific(sa_family_t family)
874{
875 switch (family) {
876 case AF_INET:
877 return sctp_af_v4_specific;
878 case AF_INET6:
879 return sctp_af_v6_specific;
880 default:
881 return NULL;
882 }
883}
884
885
886static void sctp_inet_msgname(char *msgname, int *addr_len)
887{
888 struct sockaddr_in *sin;
889
890 sin = (struct sockaddr_in *)msgname;
891 *addr_len = sizeof(struct sockaddr_in);
892 sin->sin_family = AF_INET;
893 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
894}
895
896
897static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
898 int *addr_len)
899{
900 struct sockaddr_in *sin, *sinfrom;
901
902 if (msgname) {
903 struct sctp_association *asoc;
904
905 asoc = event->asoc;
906 sctp_inet_msgname(msgname, addr_len);
907 sin = (struct sockaddr_in *)msgname;
908 sinfrom = &asoc->peer.primary_addr.v4;
909 sin->sin_port = htons(asoc->peer.port);
910 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
911 }
912}
913
914
915static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
916{
917 if (msgname) {
918 struct sctphdr *sh = sctp_hdr(skb);
919 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
920
921 sctp_inet_msgname(msgname, len);
922 sin->sin_port = sh->source;
923 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
924 }
925}
926
927
928static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
929{
930
931 return AF_INET == family;
932}
933
934
935static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
936 const union sctp_addr *addr2,
937 struct sctp_sock *opt)
938{
939
940 if (addr1->sa.sa_family != addr2->sa.sa_family)
941 return 0;
942 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
943 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
944 return 1;
945 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
946 return 1;
947
948 return 0;
949}
950
951
952
953
954static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
955{
956 return sctp_v4_available(addr, opt);
957}
958
959
960
961
962static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
963{
964 return 1;
965}
966
967
968
969
970static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
971 __be16 *types)
972{
973 types[0] = SCTP_PARAM_IPV4_ADDRESS;
974 return 1;
975}
976
977
978static inline int sctp_v4_xmit(struct sk_buff *skb,
979 struct sctp_transport *transport)
980{
981 struct inet_sock *inet = inet_sk(skb->sk);
982
983 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n",
984 __func__, skb, skb->len,
985 &transport->fl.u.ip4.saddr,
986 &transport->fl.u.ip4.daddr);
987
988 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
989 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
990
991 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
992 return ip_queue_xmit(skb, &transport->fl);
993}
994
995static struct sctp_af sctp_af_inet;
996
997static struct sctp_pf sctp_pf_inet = {
998 .event_msgname = sctp_inet_event_msgname,
999 .skb_msgname = sctp_inet_skb_msgname,
1000 .af_supported = sctp_inet_af_supported,
1001 .cmp_addr = sctp_inet_cmp_addr,
1002 .bind_verify = sctp_inet_bind_verify,
1003 .send_verify = sctp_inet_send_verify,
1004 .supported_addrs = sctp_inet_supported_addrs,
1005 .create_accept_sk = sctp_v4_create_accept_sk,
1006 .addr_v4map = sctp_v4_addr_v4map,
1007 .af = &sctp_af_inet
1008};
1009
1010
1011static struct notifier_block sctp_inetaddr_notifier = {
1012 .notifier_call = sctp_inetaddr_event,
1013};
1014
1015
1016static const struct proto_ops inet_seqpacket_ops = {
1017 .family = PF_INET,
1018 .owner = THIS_MODULE,
1019 .release = inet_release,
1020 .bind = inet_bind,
1021 .connect = inet_dgram_connect,
1022 .socketpair = sock_no_socketpair,
1023 .accept = inet_accept,
1024 .getname = inet_getname,
1025 .poll = sctp_poll,
1026 .ioctl = inet_ioctl,
1027 .listen = sctp_inet_listen,
1028 .shutdown = inet_shutdown,
1029 .setsockopt = sock_common_setsockopt,
1030 .getsockopt = sock_common_getsockopt,
1031 .sendmsg = inet_sendmsg,
1032 .recvmsg = sock_common_recvmsg,
1033 .mmap = sock_no_mmap,
1034 .sendpage = sock_no_sendpage,
1035#ifdef CONFIG_COMPAT
1036 .compat_setsockopt = compat_sock_common_setsockopt,
1037 .compat_getsockopt = compat_sock_common_getsockopt,
1038#endif
1039};
1040
1041
1042static struct inet_protosw sctp_seqpacket_protosw = {
1043 .type = SOCK_SEQPACKET,
1044 .protocol = IPPROTO_SCTP,
1045 .prot = &sctp_prot,
1046 .ops = &inet_seqpacket_ops,
1047 .no_check = 0,
1048 .flags = SCTP_PROTOSW_FLAG
1049};
1050static struct inet_protosw sctp_stream_protosw = {
1051 .type = SOCK_STREAM,
1052 .protocol = IPPROTO_SCTP,
1053 .prot = &sctp_prot,
1054 .ops = &inet_seqpacket_ops,
1055 .no_check = 0,
1056 .flags = SCTP_PROTOSW_FLAG
1057};
1058
1059
1060static const struct net_protocol sctp_protocol = {
1061 .handler = sctp_rcv,
1062 .err_handler = sctp_v4_err,
1063 .no_policy = 1,
1064};
1065
1066
1067static struct sctp_af sctp_af_inet = {
1068 .sa_family = AF_INET,
1069 .sctp_xmit = sctp_v4_xmit,
1070 .setsockopt = ip_setsockopt,
1071 .getsockopt = ip_getsockopt,
1072 .get_dst = sctp_v4_get_dst,
1073 .get_saddr = sctp_v4_get_saddr,
1074 .copy_addrlist = sctp_v4_copy_addrlist,
1075 .from_skb = sctp_v4_from_skb,
1076 .from_sk = sctp_v4_from_sk,
1077 .to_sk_saddr = sctp_v4_to_sk_saddr,
1078 .to_sk_daddr = sctp_v4_to_sk_daddr,
1079 .from_addr_param = sctp_v4_from_addr_param,
1080 .to_addr_param = sctp_v4_to_addr_param,
1081 .cmp_addr = sctp_v4_cmp_addr,
1082 .addr_valid = sctp_v4_addr_valid,
1083 .inaddr_any = sctp_v4_inaddr_any,
1084 .is_any = sctp_v4_is_any,
1085 .available = sctp_v4_available,
1086 .scope = sctp_v4_scope,
1087 .skb_iif = sctp_v4_skb_iif,
1088 .is_ce = sctp_v4_is_ce,
1089 .seq_dump_addr = sctp_v4_seq_dump_addr,
1090 .ecn_capable = sctp_v4_ecn_capable,
1091 .net_header_len = sizeof(struct iphdr),
1092 .sockaddr_len = sizeof(struct sockaddr_in),
1093#ifdef CONFIG_COMPAT
1094 .compat_setsockopt = compat_ip_setsockopt,
1095 .compat_getsockopt = compat_ip_getsockopt,
1096#endif
1097};
1098
1099struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
1100
1101 switch (family) {
1102 case PF_INET:
1103 return sctp_pf_inet_specific;
1104 case PF_INET6:
1105 return sctp_pf_inet6_specific;
1106 default:
1107 return NULL;
1108 }
1109}
1110
1111
1112int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1113{
1114 switch (family) {
1115 case PF_INET:
1116 if (sctp_pf_inet_specific)
1117 return 0;
1118 sctp_pf_inet_specific = pf;
1119 break;
1120 case PF_INET6:
1121 if (sctp_pf_inet6_specific)
1122 return 0;
1123 sctp_pf_inet6_specific = pf;
1124 break;
1125 default:
1126 return 0;
1127 }
1128 return 1;
1129}
1130
1131static inline int init_sctp_mibs(void)
1132{
1133 return snmp_mib_init((void __percpu **)sctp_statistics,
1134 sizeof(struct sctp_mib),
1135 __alignof__(struct sctp_mib));
1136}
1137
1138static inline void cleanup_sctp_mibs(void)
1139{
1140 snmp_mib_free((void __percpu **)sctp_statistics);
1141}
1142
1143static void sctp_v4_pf_init(void)
1144{
1145
1146 sctp_register_pf(&sctp_pf_inet, PF_INET);
1147 sctp_register_af(&sctp_af_inet);
1148}
1149
1150static void sctp_v4_pf_exit(void)
1151{
1152 list_del(&sctp_af_inet.list);
1153}
1154
1155static int sctp_v4_protosw_init(void)
1156{
1157 int rc;
1158
1159 rc = proto_register(&sctp_prot, 1);
1160 if (rc)
1161 return rc;
1162
1163
1164 inet_register_protosw(&sctp_seqpacket_protosw);
1165 inet_register_protosw(&sctp_stream_protosw);
1166
1167 return 0;
1168}
1169
1170static void sctp_v4_protosw_exit(void)
1171{
1172 inet_unregister_protosw(&sctp_stream_protosw);
1173 inet_unregister_protosw(&sctp_seqpacket_protosw);
1174 proto_unregister(&sctp_prot);
1175}
1176
1177static int sctp_v4_add_protocol(void)
1178{
1179
1180 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1181
1182
1183 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1184 return -EAGAIN;
1185
1186 return 0;
1187}
1188
1189static void sctp_v4_del_protocol(void)
1190{
1191 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1192 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1193}
1194
1195
1196SCTP_STATIC __init int sctp_init(void)
1197{
1198 int i;
1199 int status = -EINVAL;
1200 unsigned long goal;
1201 unsigned long limit;
1202 int max_share;
1203 int order;
1204
1205
1206 if (!sctp_sanity_check())
1207 goto out;
1208
1209
1210 status = -ENOBUFS;
1211 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1212 sizeof(struct sctp_bind_bucket),
1213 0, SLAB_HWCACHE_ALIGN,
1214 NULL);
1215 if (!sctp_bucket_cachep)
1216 goto out;
1217
1218 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1219 sizeof(struct sctp_chunk),
1220 0, SLAB_HWCACHE_ALIGN,
1221 NULL);
1222 if (!sctp_chunk_cachep)
1223 goto err_chunk_cachep;
1224
1225
1226 status = init_sctp_mibs();
1227 if (status)
1228 goto err_init_mibs;
1229
1230
1231 status = sctp_proc_init();
1232 if (status)
1233 goto err_init_proc;
1234
1235
1236 sctp_dbg_objcnt_init();
1237
1238
1239
1240
1241
1242
1243 sctp_rto_initial = SCTP_RTO_INITIAL;
1244
1245 sctp_rto_min = SCTP_RTO_MIN;
1246
1247 sctp_rto_max = SCTP_RTO_MAX;
1248
1249 sctp_rto_alpha = SCTP_RTO_ALPHA;
1250
1251 sctp_rto_beta = SCTP_RTO_BETA;
1252
1253
1254 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
1255
1256
1257 sctp_cookie_preserve_enable = 1;
1258
1259
1260 sctp_max_burst = SCTP_DEFAULT_MAX_BURST;
1261
1262
1263
1264
1265
1266 sctp_max_retrans_association = 10;
1267 sctp_max_retrans_path = 5;
1268 sctp_max_retrans_init = 8;
1269
1270
1271 sctp_sndbuf_policy = 0;
1272
1273
1274 sctp_rcvbuf_policy = 0;
1275
1276
1277 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1278
1279
1280 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
1281
1282
1283
1284
1285 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1286 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1287
1288
1289 sctp_max_autoclose = INT_MAX / HZ;
1290
1291
1292 idr_init(&sctp_assocs_id);
1293
1294 limit = nr_free_buffer_pages() / 8;
1295 limit = max(limit, 128UL);
1296 sysctl_sctp_mem[0] = limit / 4 * 3;
1297 sysctl_sctp_mem[1] = limit;
1298 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1299
1300
1301 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1302 max_share = min(4UL*1024*1024, limit);
1303
1304 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM;
1305 sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1306 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1307
1308 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1309 sysctl_sctp_wmem[1] = 16*1024;
1310 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1311
1312
1313
1314
1315 if (totalram_pages >= (128 * 1024))
1316 goal = totalram_pages >> (22 - PAGE_SHIFT);
1317 else
1318 goal = totalram_pages >> (24 - PAGE_SHIFT);
1319
1320 for (order = 0; (1UL << order) < goal; order++)
1321 ;
1322
1323 do {
1324 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1325 sizeof(struct sctp_hashbucket);
1326 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1327 continue;
1328 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1329 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1330 } while (!sctp_assoc_hashtable && --order > 0);
1331 if (!sctp_assoc_hashtable) {
1332 pr_err("Failed association hash alloc\n");
1333 status = -ENOMEM;
1334 goto err_ahash_alloc;
1335 }
1336 for (i = 0; i < sctp_assoc_hashsize; i++) {
1337 rwlock_init(&sctp_assoc_hashtable[i].lock);
1338 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
1339 }
1340
1341
1342 sctp_ep_hashsize = 64;
1343 sctp_ep_hashtable = (struct sctp_hashbucket *)
1344 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1345 if (!sctp_ep_hashtable) {
1346 pr_err("Failed endpoint_hash alloc\n");
1347 status = -ENOMEM;
1348 goto err_ehash_alloc;
1349 }
1350 for (i = 0; i < sctp_ep_hashsize; i++) {
1351 rwlock_init(&sctp_ep_hashtable[i].lock);
1352 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1353 }
1354
1355
1356 do {
1357 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1358 sizeof(struct sctp_bind_hashbucket);
1359 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1360 continue;
1361 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1362 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1363 } while (!sctp_port_hashtable && --order > 0);
1364 if (!sctp_port_hashtable) {
1365 pr_err("Failed bind hash alloc\n");
1366 status = -ENOMEM;
1367 goto err_bhash_alloc;
1368 }
1369 for (i = 0; i < sctp_port_hashsize; i++) {
1370 spin_lock_init(&sctp_port_hashtable[i].lock);
1371 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1372 }
1373
1374 pr_info("Hash tables configured (established %d bind %d)\n",
1375 sctp_assoc_hashsize, sctp_port_hashsize);
1376
1377
1378 sctp_addip_enable = 0;
1379 sctp_addip_noauth = 0;
1380 sctp_default_auto_asconf = 0;
1381
1382
1383 sctp_prsctp_enable = 1;
1384
1385
1386 sctp_auth_enable = 0;
1387
1388
1389 sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1390
1391
1392 sctp_rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1393
1394 sctp_sysctl_register();
1395
1396 INIT_LIST_HEAD(&sctp_address_families);
1397 sctp_v4_pf_init();
1398 sctp_v6_pf_init();
1399
1400
1401 INIT_LIST_HEAD(&sctp_local_addr_list);
1402 spin_lock_init(&sctp_local_addr_lock);
1403 sctp_get_local_addr_list();
1404
1405
1406 INIT_LIST_HEAD(&sctp_addr_waitq);
1407 INIT_LIST_HEAD(&sctp_auto_asconf_splist);
1408 spin_lock_init(&sctp_addr_wq_lock);
1409 sctp_addr_wq_timer.expires = 0;
1410 setup_timer(&sctp_addr_wq_timer, sctp_addr_wq_timeout_handler, 0);
1411
1412 status = sctp_v4_protosw_init();
1413
1414 if (status)
1415 goto err_protosw_init;
1416
1417 status = sctp_v6_protosw_init();
1418 if (status)
1419 goto err_v6_protosw_init;
1420
1421
1422 if ((status = sctp_ctl_sock_init())) {
1423 pr_err("Failed to initialize the SCTP control sock\n");
1424 goto err_ctl_sock_init;
1425 }
1426
1427 status = sctp_v4_add_protocol();
1428 if (status)
1429 goto err_add_protocol;
1430
1431
1432 status = sctp_v6_add_protocol();
1433 if (status)
1434 goto err_v6_add_protocol;
1435
1436 status = 0;
1437out:
1438 return status;
1439err_v6_add_protocol:
1440 sctp_v4_del_protocol();
1441err_add_protocol:
1442 inet_ctl_sock_destroy(sctp_ctl_sock);
1443err_ctl_sock_init:
1444 sctp_v6_protosw_exit();
1445err_v6_protosw_init:
1446 sctp_v4_protosw_exit();
1447err_protosw_init:
1448 sctp_free_local_addr_list();
1449 sctp_v4_pf_exit();
1450 sctp_v6_pf_exit();
1451 sctp_sysctl_unregister();
1452 free_pages((unsigned long)sctp_port_hashtable,
1453 get_order(sctp_port_hashsize *
1454 sizeof(struct sctp_bind_hashbucket)));
1455err_bhash_alloc:
1456 kfree(sctp_ep_hashtable);
1457err_ehash_alloc:
1458 free_pages((unsigned long)sctp_assoc_hashtable,
1459 get_order(sctp_assoc_hashsize *
1460 sizeof(struct sctp_hashbucket)));
1461err_ahash_alloc:
1462 sctp_dbg_objcnt_exit();
1463 sctp_proc_exit();
1464err_init_proc:
1465 cleanup_sctp_mibs();
1466err_init_mibs:
1467 kmem_cache_destroy(sctp_chunk_cachep);
1468err_chunk_cachep:
1469 kmem_cache_destroy(sctp_bucket_cachep);
1470 goto out;
1471}
1472
1473
1474SCTP_STATIC __exit void sctp_exit(void)
1475{
1476
1477
1478
1479
1480
1481 sctp_v6_del_protocol();
1482 sctp_v4_del_protocol();
1483 sctp_free_addr_wq();
1484
1485
1486 inet_ctl_sock_destroy(sctp_ctl_sock);
1487
1488
1489 sctp_v6_protosw_exit();
1490 sctp_v4_protosw_exit();
1491
1492
1493 sctp_free_local_addr_list();
1494
1495
1496 sctp_v6_pf_exit();
1497 sctp_v4_pf_exit();
1498
1499 sctp_sysctl_unregister();
1500
1501 free_pages((unsigned long)sctp_assoc_hashtable,
1502 get_order(sctp_assoc_hashsize *
1503 sizeof(struct sctp_hashbucket)));
1504 kfree(sctp_ep_hashtable);
1505 free_pages((unsigned long)sctp_port_hashtable,
1506 get_order(sctp_port_hashsize *
1507 sizeof(struct sctp_bind_hashbucket)));
1508
1509 sctp_dbg_objcnt_exit();
1510 sctp_proc_exit();
1511 cleanup_sctp_mibs();
1512
1513 rcu_barrier();
1514
1515 kmem_cache_destroy(sctp_chunk_cachep);
1516 kmem_cache_destroy(sctp_bucket_cachep);
1517}
1518
1519module_init(sctp_init);
1520module_exit(sctp_exit);
1521
1522
1523
1524
1525MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1526MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1527MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1528MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1529module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1530MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1531MODULE_LICENSE("GPL");
1532