Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[linux-2.6.git] / net / sctp / protocol.c
1 /* SCTP kernel implementation
2  * (C) Copyright IBM Corp. 2001, 2004
3  * Copyright (c) 1999-2000 Cisco, Inc.
4  * Copyright (c) 1999-2001 Motorola, Inc.
5  * Copyright (c) 2001 Intel Corp.
6  * Copyright (c) 2001 Nokia, Inc.
7  * Copyright (c) 2001 La Monte H.P. Yarroll
8  *
9  * This file is part of the SCTP kernel implementation
10  *
11  * Initialization/cleanup for SCTP protocol support.
12  *
13  * This SCTP implementation is free software;
14  * you can redistribute it and/or modify it under the terms of
15  * the GNU General Public License as published by
16  * the Free Software Foundation; either version 2, or (at your option)
17  * any later version.
18  *
19  * This SCTP implementation is distributed in the hope that it
20  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21  *                 ************************
22  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23  * See the GNU General Public License for more details.
24  *
25  * You should have received a copy of the GNU General Public License
26  * along with GNU CC; see the file COPYING.  If not, write to
27  * the Free Software Foundation, 59 Temple Place - Suite 330,
28  * Boston, MA 02111-1307, USA.
29  *
30  * Please send any bug reports or fixes you make to the
31  * email address(es):
32  *    lksctp developers <lksctp-developers@lists.sourceforge.net>
33  *
34  * Or submit a bug report through the following website:
35  *    http://www.sf.net/projects/lksctp
36  *
37  * Written or modified by:
38  *    La Monte H.P. Yarroll <piggy@acm.org>
39  *    Karl Knutson <karl@athena.chicago.il.us>
40  *    Jon Grimm <jgrimm@us.ibm.com>
41  *    Sridhar Samudrala <sri@us.ibm.com>
42  *    Daisy Chang <daisyc@us.ibm.com>
43  *    Ardelle Fan <ardelle.fan@intel.com>
44  *
45  * Any bugs reported given to us we will try to fix... any fixes shared will
46  * be incorporated into the next SCTP release.
47  */
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 /* Global data structures. */
71 struct sctp_globals sctp_globals __read_mostly;
72 DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly;
73
74 #ifdef CONFIG_PROC_FS
75 struct proc_dir_entry   *proc_net_sctp;
76 #endif
77
78 struct idr sctp_assocs_id;
79 DEFINE_SPINLOCK(sctp_assocs_id_lock);
80
81 /* This is the global socket data structure used for responding to
82  * the Out-of-the-blue (OOTB) packets.  A control sock will be created
83  * for this socket at the initialization time.
84  */
85 static struct sock *sctp_ctl_sock;
86
87 static struct sctp_pf *sctp_pf_inet6_specific;
88 static struct sctp_pf *sctp_pf_inet_specific;
89 static struct sctp_af *sctp_af_v4_specific;
90 static struct sctp_af *sctp_af_v6_specific;
91
92 struct kmem_cache *sctp_chunk_cachep __read_mostly;
93 struct kmem_cache *sctp_bucket_cachep __read_mostly;
94
95 long sysctl_sctp_mem[3];
96 int sysctl_sctp_rmem[3];
97 int sysctl_sctp_wmem[3];
98
99 /* Return the address of the control sock. */
100 struct sock *sctp_get_ctl_sock(void)
101 {
102         return sctp_ctl_sock;
103 }
104
105 /* Set up the proc fs entry for the SCTP protocol. */
106 static __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
128 out_remaddr_proc_init:
129         sctp_assocs_proc_exit();
130 out_assocs_proc_init:
131         sctp_eps_proc_exit();
132 out_eps_proc_init:
133         sctp_snmp_proc_exit();
134 out_snmp_proc_init:
135         if (proc_net_sctp) {
136                 proc_net_sctp = NULL;
137                 remove_proc_entry("sctp", init_net.proc_net);
138         }
139 out_free_percpu:
140         percpu_counter_destroy(&sctp_sockets_allocated);
141 #else
142         return 0;
143 #endif /* CONFIG_PROC_FS */
144
145 out_nomem:
146         return -ENOMEM;
147 }
148
149 /* Clean up the proc fs entry for the SCTP protocol.
150  * Note: Do not make this __exit as it is used in the init error
151  * path.
152  */
153 static 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 /* Private helper to extract ipv4 address and stash them in
170  * the protocol structure.
171  */
172 static 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                 /* Add the address to the local list.  */
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 /* Extract our IP addresses from the system and stash them in the
202  * protocol structure.
203  */
204 static 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 /* Free the existing local addresses.  */
221 static 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 /* Copy the local addresses which are valid for 'scope' into 'bp'.  */
234 int 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                         /* Now that the address is in scope, check to see if
246                          * the address type is really supported by the local
247                          * sock as well as the remote peer.
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
262 end_copy:
263         rcu_read_unlock();
264         return error;
265 }
266
267 /* Initialize a sctp_addr from in incoming skb.  */
268 static 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 /* Initialize an sctp_addr from a socket. */
290 static 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 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
298 static 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 /* Initialize sk->sk_daddr from sctp_addr. */
304 static 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 /* Initialize a sctp_addr from an address parameter. */
310 static 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 /* Initialize an address parameter from a sctp_addr and return the length
320  * of the address parameter.
321  */
322 static 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 /* Initialize a sctp_addr from a dst_entry. */
335 static 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 /* Compare two addresses exactly. */
344 static 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 /* Initialize addr struct to INADDR_ANY. */
358 static 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 /* Is this a wildcard address? */
366 static 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 /* This function checks if the address is a valid address to be used for
372  * SCTP binding.
373  *
374  * Output:
375  * Return 0 - If the address is a non-unicast or an illegal address.
376  * Return 1 - If the address is a unicast.
377  */
378 static int sctp_v4_addr_valid(union sctp_addr *addr,
379                               struct sctp_sock *sp,
380                               const struct sk_buff *skb)
381 {
382         /* IPv4 addresses not allowed */
383         if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
384                 return 0;
385
386         /* Is this a non-unicast address or a unusable SCTP address? */
387         if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
388                 return 0;
389
390         /* Is this a broadcast address? */
391         if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
392                 return 0;
393
394         return 1;
395 }
396
397 /* Should this be available for binding?   */
398 static 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 /* Checking the loopback, private and other address scopes as defined in
416  * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
417  * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
418  *
419  * Level 0 - unusable SCTP addresses
420  * Level 1 - loopback address
421  * Level 2 - link-local addresses
422  * Level 3 - private addresses.
423  * Level 4 - global addresses
424  * For INIT and INIT-ACK address list, let L be the level of
425  * of requested destination address, sender and receiver
426  * SHOULD include all of its addresses with level greater
427  * than or equal to L.
428  *
429  * IPv4 scoping can be controlled through sysctl option
430  * net.sctp.addr_scope_policy
431  */
432 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
433 {
434         sctp_scope_t retval;
435
436         /* Check for unusable SCTP addresses. */
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 /* Returns a valid dst cache entry for the given source and destination ip
455  * addresses. If an association is passed, trys to get a dst entry with a
456  * source address that matches an address in the bind address list.
457  */
458 static 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         /* If there is no association or if a source address is passed, no
492          * more validation is required.
493          */
494         if (!asoc || saddr)
495                 goto out;
496
497         bp = &asoc->base.bind_addr;
498
499         if (dst) {
500                 /* Walk through the bind address list and look for a bind
501                  * address that matches the source address of the returned dst.
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                 /* None of the bound addresses match the source address of the
516                  * dst. So release it.
517                  */
518                 dst_release(dst);
519                 dst = NULL;
520         }
521
522         /* Walk through the bind address list and try to get a dst that
523          * matches a bind address as the source address.
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
541 out_unlock:
542         rcu_read_unlock();
543 out:
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 /* For v4, the source address is cached in the route entry(dst). So no need
553  * to cache it separately and hence this is an empty routine.
554  */
555 static 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 /* What interface did this skb arrive on? */
569 static int sctp_v4_skb_iif(const struct sk_buff *skb)
570 {
571         return skb_rtable(skb)->rt_iif;
572 }
573
574 /* Was this packet marked by Explicit Congestion Notification? */
575 static int sctp_v4_is_ce(const struct sk_buff *skb)
576 {
577         return INET_ECN_is_ce(ip_hdr(skb)->tos);
578 }
579
580 /* Create and initialize a new sk for the socket returned by accept(). */
581 static 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
607 out:
608         return newsk;
609 }
610
611 /* Map address, empty for v4 family */
612 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
613 {
614         /* Empty */
615 }
616
617 /* Dump the v4 addr to the seq file. */
618 static 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
623 static void sctp_v4_ecn_capable(struct sock *sk)
624 {
625         INET_ECN_xmit(sk);
626 }
627
628 void 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                 /* Now we send an ASCONF for each association */
642                 /* Note. we currently don't handle link local IPv6 addressees */
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                         /* ignore bound-specific endpoints */
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                 }
676 free_next:
677                 list_del(&addrw->list);
678                 kfree(addrw);
679         }
680         spin_unlock_bh(&sctp_addr_wq_lock);
681 }
682
683 static 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 /* lookup the entry for the same address in the addr_waitq
698  * sctp_addr_wq MUST be locked
699  */
700 static 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
720 void 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         /* first, we check if an opposite message already exist in the queue.
726          * If we found such message, it is removed.
727          * This operation is a bit stupid, but the DHCP client attaches the
728          * new address after a couple of addition and deletion of that address
729          */
730
731         spin_lock_bh(&sctp_addr_wq_lock);
732         /* Offsets existing events in addr_wq */
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         /* OK, we have to add the new address to the wait queue */
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 /* Event handler for inet address addition/deletion events.
766  * The sctp_local_addr_list needs to be protocted by a spin lock since
767  * multiple notifiers (say IPv4 and IPv6) may be running at the same
768  * time and thus corrupt the list.
769  * The reader side is protected with RCU.
770  */
771 static 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  * Initialize the control inode/socket with a control endpoint data
821  * structure.  This endpoint is reserved exclusively for the OOTB processing.
822  */
823 static 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         /* If IPv6 socket could not be created, try the IPv4 socket */
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 /* Register address family specific functions. */
848 int 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 /* Get the table of functions for manipulating a particular address
871  * family.
872  */
873 struct 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 /* Common code to initialize a AF_INET msg_name. */
886 static 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 /* Copy the primary address of the peer primary address as the msg_name. */
897 static 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 /* Initialize and copy out a msgname from an inbound skb. */
915 static 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 /* Do we support this AF? */
928 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
929 {
930         /* PF_INET only supports AF_INET addresses. */
931         return AF_INET == family;
932 }
933
934 /* Address matching with wildcards allowed. */
935 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
936                               const union sctp_addr *addr2,
937                               struct sctp_sock *opt)
938 {
939         /* PF_INET only supports AF_INET addresses. */
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 /* Verify that provided sockaddr looks bindable.  Common verification has
952  * already been taken care of.
953  */
954 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
955 {
956         return sctp_v4_available(addr, opt);
957 }
958
959 /* Verify that sockaddr looks sendable.  Common verification has already
960  * been taken care of.
961  */
962 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
963 {
964         return 1;
965 }
966
967 /* Fill in Supported Address Type information for INIT and INIT-ACK
968  * chunks.  Returns number of addresses supported.
969  */
970 static 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 /* Wrapper routine that calls the ip transmit routine. */
978 static 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
995 static struct sctp_af sctp_af_inet;
996
997 static 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 /* Notifier for inetaddr addition/deletion events.  */
1011 static struct notifier_block sctp_inetaddr_notifier = {
1012         .notifier_call = sctp_inetaddr_event,
1013 };
1014
1015 /* Socket operations.  */
1016 static const struct proto_ops inet_seqpacket_ops = {
1017         .family            = PF_INET,
1018         .owner             = THIS_MODULE,
1019         .release           = inet_release,      /* Needs to be wrapped... */
1020         .bind              = inet_bind,
1021         .connect           = inet_dgram_connect,
1022         .socketpair        = sock_no_socketpair,
1023         .accept            = inet_accept,
1024         .getname           = inet_getname,      /* Semantics are different.  */
1025         .poll              = sctp_poll,
1026         .ioctl             = inet_ioctl,
1027         .listen            = sctp_inet_listen,
1028         .shutdown          = inet_shutdown,     /* Looks harmless.  */
1029         .setsockopt        = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
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 /* Registration with AF_INET family.  */
1042 static 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 };
1050 static 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 /* Register with IP layer.  */
1060 static const struct net_protocol sctp_protocol = {
1061         .handler     = sctp_rcv,
1062         .err_handler = sctp_v4_err,
1063         .no_policy   = 1,
1064 };
1065
1066 /* IPv4 address related functions.  */
1067 static 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
1099 struct 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 /* Register the PF specific function table.  */
1112 int 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
1131 static 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
1138 static inline void cleanup_sctp_mibs(void)
1139 {
1140         snmp_mib_free((void __percpu **)sctp_statistics);
1141 }
1142
1143 static void sctp_v4_pf_init(void)
1144 {
1145         /* Initialize the SCTP specific PF functions. */
1146         sctp_register_pf(&sctp_pf_inet, PF_INET);
1147         sctp_register_af(&sctp_af_inet);
1148 }
1149
1150 static void sctp_v4_pf_exit(void)
1151 {
1152         list_del(&sctp_af_inet.list);
1153 }
1154
1155 static 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         /* Register SCTP(UDP and TCP style) with socket layer.  */
1164         inet_register_protosw(&sctp_seqpacket_protosw);
1165         inet_register_protosw(&sctp_stream_protosw);
1166
1167         return 0;
1168 }
1169
1170 static 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
1177 static int sctp_v4_add_protocol(void)
1178 {
1179         /* Register notifier for inet address additions/deletions. */
1180         register_inetaddr_notifier(&sctp_inetaddr_notifier);
1181
1182         /* Register SCTP with inet layer.  */
1183         if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1184                 return -EAGAIN;
1185
1186         return 0;
1187 }
1188
1189 static 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 /* Initialize the universe into something sensible.  */
1196 SCTP_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         /* SCTP_DEBUG sanity check. */
1206         if (!sctp_sanity_check())
1207                 goto out;
1208
1209         /* Allocate bind_bucket and chunk caches. */
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         /* Allocate and initialise sctp mibs.  */
1226         status = init_sctp_mibs();
1227         if (status)
1228                 goto err_init_mibs;
1229
1230         /* Initialize proc fs directory.  */
1231         status = sctp_proc_init();
1232         if (status)
1233                 goto err_init_proc;
1234
1235         /* Initialize object count debugging.  */
1236         sctp_dbg_objcnt_init();
1237
1238         /*
1239          * 14. Suggested SCTP Protocol Parameter Values
1240          */
1241         /* The following protocol parameters are RECOMMENDED:  */
1242         /* RTO.Initial              - 3  seconds */
1243         sctp_rto_initial                = SCTP_RTO_INITIAL;
1244         /* RTO.Min                  - 1  second */
1245         sctp_rto_min                    = SCTP_RTO_MIN;
1246         /* RTO.Max                 -  60 seconds */
1247         sctp_rto_max                    = SCTP_RTO_MAX;
1248         /* RTO.Alpha                - 1/8 */
1249         sctp_rto_alpha                  = SCTP_RTO_ALPHA;
1250         /* RTO.Beta                 - 1/4 */
1251         sctp_rto_beta                   = SCTP_RTO_BETA;
1252
1253         /* Valid.Cookie.Life        - 60  seconds */
1254         sctp_valid_cookie_life          = SCTP_DEFAULT_COOKIE_LIFE;
1255
1256         /* Whether Cookie Preservative is enabled(1) or not(0) */
1257         sctp_cookie_preserve_enable     = 1;
1258
1259         /* Max.Burst                - 4 */
1260         sctp_max_burst                  = SCTP_DEFAULT_MAX_BURST;
1261
1262         /* Association.Max.Retrans  - 10 attempts
1263          * Path.Max.Retrans         - 5  attempts (per destination address)
1264          * Max.Init.Retransmits     - 8  attempts
1265          */
1266         sctp_max_retrans_association    = 10;
1267         sctp_max_retrans_path           = 5;
1268         sctp_max_retrans_init           = 8;
1269
1270         /* Sendbuffer growth        - do per-socket accounting */
1271         sctp_sndbuf_policy              = 0;
1272
1273         /* Rcvbuffer growth         - do per-socket accounting */
1274         sctp_rcvbuf_policy              = 0;
1275
1276         /* HB.interval              - 30 seconds */
1277         sctp_hb_interval                = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1278
1279         /* delayed SACK timeout */
1280         sctp_sack_timeout               = SCTP_DEFAULT_TIMEOUT_SACK;
1281
1282         /* Implementation specific variables. */
1283
1284         /* Initialize default stream count setup information. */
1285         sctp_max_instreams              = SCTP_DEFAULT_INSTREAMS;
1286         sctp_max_outstreams             = SCTP_DEFAULT_OUTSTREAMS;
1287
1288         /* Initialize maximum autoclose timeout. */
1289         sctp_max_autoclose              = INT_MAX / HZ;
1290
1291         /* Initialize handle used for association ids. */
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         /* Set per-socket limits to no more than 1/128 the pressure threshold*/
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; /* give each asoc 1 page min */
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         /* Size and allocate the association hash table.
1313          * The methodology is similar to that of the tcp hash tables.
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         /* Allocate and initialize the endpoint hash table.  */
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         /* Allocate and initialize the SCTP port hash table.  */
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         /* Disable ADDIP by default. */
1378         sctp_addip_enable = 0;
1379         sctp_addip_noauth = 0;
1380         sctp_default_auto_asconf = 0;
1381
1382         /* Enable PR-SCTP by default. */
1383         sctp_prsctp_enable = 1;
1384
1385         /* Disable AUTH by default. */
1386         sctp_auth_enable = 0;
1387
1388         /* Set SCOPE policy to enabled */
1389         sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1390
1391         /* Set the default rwnd update threshold */
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         /* Initialize the local address list. */
1401         INIT_LIST_HEAD(&sctp_local_addr_list);
1402         spin_lock_init(&sctp_local_addr_lock);
1403         sctp_get_local_addr_list();
1404
1405         /* Initialize the address event list */
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         /* Initialize the control inode/socket for handling OOTB packets.  */
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         /* Register SCTP with inet6 layer.  */
1432         status = sctp_v6_add_protocol();
1433         if (status)
1434                 goto err_v6_add_protocol;
1435
1436         status = 0;
1437 out:
1438         return status;
1439 err_v6_add_protocol:
1440         sctp_v4_del_protocol();
1441 err_add_protocol:
1442         inet_ctl_sock_destroy(sctp_ctl_sock);
1443 err_ctl_sock_init:
1444         sctp_v6_protosw_exit();
1445 err_v6_protosw_init:
1446         sctp_v4_protosw_exit();
1447 err_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)));
1455 err_bhash_alloc:
1456         kfree(sctp_ep_hashtable);
1457 err_ehash_alloc:
1458         free_pages((unsigned long)sctp_assoc_hashtable,
1459                    get_order(sctp_assoc_hashsize *
1460                              sizeof(struct sctp_hashbucket)));
1461 err_ahash_alloc:
1462         sctp_dbg_objcnt_exit();
1463         sctp_proc_exit();
1464 err_init_proc:
1465         cleanup_sctp_mibs();
1466 err_init_mibs:
1467         kmem_cache_destroy(sctp_chunk_cachep);
1468 err_chunk_cachep:
1469         kmem_cache_destroy(sctp_bucket_cachep);
1470         goto out;
1471 }
1472
1473 /* Exit handler for the SCTP protocol.  */
1474 SCTP_STATIC __exit void sctp_exit(void)
1475 {
1476         /* BUG.  This should probably do something useful like clean
1477          * up all the remaining associations and all that memory.
1478          */
1479
1480         /* Unregister with inet6/inet layers. */
1481         sctp_v6_del_protocol();
1482         sctp_v4_del_protocol();
1483         sctp_free_addr_wq();
1484
1485         /* Free the control endpoint.  */
1486         inet_ctl_sock_destroy(sctp_ctl_sock);
1487
1488         /* Free protosw registrations */
1489         sctp_v6_protosw_exit();
1490         sctp_v4_protosw_exit();
1491
1492         /* Free the local address list.  */
1493         sctp_free_local_addr_list();
1494
1495         /* Unregister with socket layer. */
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(); /* Wait for completion of call_rcu()'s */
1514
1515         kmem_cache_destroy(sctp_chunk_cachep);
1516         kmem_cache_destroy(sctp_bucket_cachep);
1517 }
1518
1519 module_init(sctp_init);
1520 module_exit(sctp_exit);
1521
1522 /*
1523  * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1524  */
1525 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1526 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1527 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1528 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1529 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1530 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1531 MODULE_LICENSE("GPL");