xref: /openbmc/linux/net/sctp/protocol.c (revision a1e58bbd)
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 #include <linux/module.h>
50 #include <linux/init.h>
51 #include <linux/netdevice.h>
52 #include <linux/inetdevice.h>
53 #include <linux/seq_file.h>
54 #include <linux/bootmem.h>
55 #include <net/net_namespace.h>
56 #include <net/protocol.h>
57 #include <net/ip.h>
58 #include <net/ipv6.h>
59 #include <net/route.h>
60 #include <net/sctp/sctp.h>
61 #include <net/addrconf.h>
62 #include <net/inet_common.h>
63 #include <net/inet_ecn.h>
64 
65 /* Global data structures. */
66 struct sctp_globals sctp_globals __read_mostly;
67 struct proc_dir_entry	*proc_net_sctp;
68 DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly;
69 
70 struct idr sctp_assocs_id;
71 DEFINE_SPINLOCK(sctp_assocs_id_lock);
72 
73 /* This is the global socket data structure used for responding to
74  * the Out-of-the-blue (OOTB) packets.  A control sock will be created
75  * for this socket at the initialization time.
76  */
77 static struct socket *sctp_ctl_socket;
78 
79 static struct sctp_pf *sctp_pf_inet6_specific;
80 static struct sctp_pf *sctp_pf_inet_specific;
81 static struct sctp_af *sctp_af_v4_specific;
82 static struct sctp_af *sctp_af_v6_specific;
83 
84 struct kmem_cache *sctp_chunk_cachep __read_mostly;
85 struct kmem_cache *sctp_bucket_cachep __read_mostly;
86 
87 int sysctl_sctp_mem[3];
88 int sysctl_sctp_rmem[3];
89 int sysctl_sctp_wmem[3];
90 
91 /* Return the address of the control sock. */
92 struct sock *sctp_get_ctl_sock(void)
93 {
94 	return sctp_ctl_socket->sk;
95 }
96 
97 /* Set up the proc fs entry for the SCTP protocol. */
98 static __init int sctp_proc_init(void)
99 {
100 	if (!proc_net_sctp) {
101 		struct proc_dir_entry *ent;
102 		ent = proc_mkdir("sctp", init_net.proc_net);
103 		if (ent) {
104 			ent->owner = THIS_MODULE;
105 			proc_net_sctp = ent;
106 		} else
107 			goto out_nomem;
108 	}
109 
110 	if (sctp_snmp_proc_init())
111 		goto out_nomem;
112 	if (sctp_eps_proc_init())
113 		goto out_nomem;
114 	if (sctp_assocs_proc_init())
115 		goto out_nomem;
116 
117 	return 0;
118 
119 out_nomem:
120 	return -ENOMEM;
121 }
122 
123 /* Clean up the proc fs entry for the SCTP protocol.
124  * Note: Do not make this __exit as it is used in the init error
125  * path.
126  */
127 static void sctp_proc_exit(void)
128 {
129 	sctp_snmp_proc_exit();
130 	sctp_eps_proc_exit();
131 	sctp_assocs_proc_exit();
132 
133 	if (proc_net_sctp) {
134 		proc_net_sctp = NULL;
135 		remove_proc_entry("sctp", init_net.proc_net);
136 	}
137 }
138 
139 /* Private helper to extract ipv4 address and stash them in
140  * the protocol structure.
141  */
142 static void sctp_v4_copy_addrlist(struct list_head *addrlist,
143 				  struct net_device *dev)
144 {
145 	struct in_device *in_dev;
146 	struct in_ifaddr *ifa;
147 	struct sctp_sockaddr_entry *addr;
148 
149 	rcu_read_lock();
150 	if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
151 		rcu_read_unlock();
152 		return;
153 	}
154 
155 	for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
156 		/* Add the address to the local list.  */
157 		addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
158 		if (addr) {
159 			addr->a.v4.sin_family = AF_INET;
160 			addr->a.v4.sin_port = 0;
161 			addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
162 			addr->valid = 1;
163 			INIT_LIST_HEAD(&addr->list);
164 			INIT_RCU_HEAD(&addr->rcu);
165 			list_add_tail(&addr->list, addrlist);
166 		}
167 	}
168 
169 	rcu_read_unlock();
170 }
171 
172 /* Extract our IP addresses from the system and stash them in the
173  * protocol structure.
174  */
175 static void sctp_get_local_addr_list(void)
176 {
177 	struct net_device *dev;
178 	struct list_head *pos;
179 	struct sctp_af *af;
180 
181 	read_lock(&dev_base_lock);
182 	for_each_netdev(&init_net, dev) {
183 		__list_for_each(pos, &sctp_address_families) {
184 			af = list_entry(pos, struct sctp_af, list);
185 			af->copy_addrlist(&sctp_local_addr_list, dev);
186 		}
187 	}
188 	read_unlock(&dev_base_lock);
189 }
190 
191 /* Free the existing local addresses.  */
192 static void sctp_free_local_addr_list(void)
193 {
194 	struct sctp_sockaddr_entry *addr;
195 	struct list_head *pos, *temp;
196 
197 	list_for_each_safe(pos, temp, &sctp_local_addr_list) {
198 		addr = list_entry(pos, struct sctp_sockaddr_entry, list);
199 		list_del(pos);
200 		kfree(addr);
201 	}
202 }
203 
204 void sctp_local_addr_free(struct rcu_head *head)
205 {
206 	struct sctp_sockaddr_entry *e = container_of(head,
207 				struct sctp_sockaddr_entry, rcu);
208 	kfree(e);
209 }
210 
211 /* Copy the local addresses which are valid for 'scope' into 'bp'.  */
212 int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
213 			      gfp_t gfp, int copy_flags)
214 {
215 	struct sctp_sockaddr_entry *addr;
216 	int error = 0;
217 
218 	rcu_read_lock();
219 	list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
220 		if (!addr->valid)
221 			continue;
222 		if (sctp_in_scope(&addr->a, scope)) {
223 			/* Now that the address is in scope, check to see if
224 			 * the address type is really supported by the local
225 			 * sock as well as the remote peer.
226 			 */
227 			if ((((AF_INET == addr->a.sa.sa_family) &&
228 			      (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
229 			    (((AF_INET6 == addr->a.sa.sa_family) &&
230 			      (copy_flags & SCTP_ADDR6_ALLOWED) &&
231 			      (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
232 				error = sctp_add_bind_addr(bp, &addr->a,
233 						    SCTP_ADDR_SRC, GFP_ATOMIC);
234 				if (error)
235 					goto end_copy;
236 			}
237 		}
238 	}
239 
240 end_copy:
241 	rcu_read_unlock();
242 	return error;
243 }
244 
245 /* Initialize a sctp_addr from in incoming skb.  */
246 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
247 			     int is_saddr)
248 {
249 	void *from;
250 	__be16 *port;
251 	struct sctphdr *sh;
252 
253 	port = &addr->v4.sin_port;
254 	addr->v4.sin_family = AF_INET;
255 
256 	sh = sctp_hdr(skb);
257 	if (is_saddr) {
258 		*port  = sh->source;
259 		from = &ip_hdr(skb)->saddr;
260 	} else {
261 		*port = sh->dest;
262 		from = &ip_hdr(skb)->daddr;
263 	}
264 	memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
265 }
266 
267 /* Initialize an sctp_addr from a socket. */
268 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
269 {
270 	addr->v4.sin_family = AF_INET;
271 	addr->v4.sin_port = 0;
272 	addr->v4.sin_addr.s_addr = inet_sk(sk)->rcv_saddr;
273 }
274 
275 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
276 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
277 {
278 	inet_sk(sk)->rcv_saddr = addr->v4.sin_addr.s_addr;
279 }
280 
281 /* Initialize sk->sk_daddr from sctp_addr. */
282 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
283 {
284 	inet_sk(sk)->daddr = addr->v4.sin_addr.s_addr;
285 }
286 
287 /* Initialize a sctp_addr from an address parameter. */
288 static void sctp_v4_from_addr_param(union sctp_addr *addr,
289 				    union sctp_addr_param *param,
290 				    __be16 port, int iif)
291 {
292 	addr->v4.sin_family = AF_INET;
293 	addr->v4.sin_port = port;
294 	addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
295 }
296 
297 /* Initialize an address parameter from a sctp_addr and return the length
298  * of the address parameter.
299  */
300 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
301 				 union sctp_addr_param *param)
302 {
303 	int length = sizeof(sctp_ipv4addr_param_t);
304 
305 	param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
306 	param->v4.param_hdr.length = htons(length);
307 	param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
308 
309 	return length;
310 }
311 
312 /* Initialize a sctp_addr from a dst_entry. */
313 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst,
314 			      __be16 port)
315 {
316 	struct rtable *rt = (struct rtable *)dst;
317 	saddr->v4.sin_family = AF_INET;
318 	saddr->v4.sin_port = port;
319 	saddr->v4.sin_addr.s_addr = rt->rt_src;
320 }
321 
322 /* Compare two addresses exactly. */
323 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
324 			    const union sctp_addr *addr2)
325 {
326 	if (addr1->sa.sa_family != addr2->sa.sa_family)
327 		return 0;
328 	if (addr1->v4.sin_port != addr2->v4.sin_port)
329 		return 0;
330 	if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
331 		return 0;
332 
333 	return 1;
334 }
335 
336 /* Initialize addr struct to INADDR_ANY. */
337 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
338 {
339 	addr->v4.sin_family = AF_INET;
340 	addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
341 	addr->v4.sin_port = port;
342 }
343 
344 /* Is this a wildcard address? */
345 static int sctp_v4_is_any(const union sctp_addr *addr)
346 {
347 	return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
348 }
349 
350 /* This function checks if the address is a valid address to be used for
351  * SCTP binding.
352  *
353  * Output:
354  * Return 0 - If the address is a non-unicast or an illegal address.
355  * Return 1 - If the address is a unicast.
356  */
357 static int sctp_v4_addr_valid(union sctp_addr *addr,
358 			      struct sctp_sock *sp,
359 			      const struct sk_buff *skb)
360 {
361 	/* Is this a non-unicast address or a unusable SCTP address? */
362 	if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
363 		return 0;
364 
365 	/* Is this a broadcast address? */
366 	if (skb && ((struct rtable *)skb->dst)->rt_flags & RTCF_BROADCAST)
367 		return 0;
368 
369 	return 1;
370 }
371 
372 /* Should this be available for binding?   */
373 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
374 {
375 	int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr);
376 
377 
378 	if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
379 	   ret != RTN_LOCAL &&
380 	   !sp->inet.freebind &&
381 	   !sysctl_ip_nonlocal_bind)
382 		return 0;
383 
384 	return 1;
385 }
386 
387 /* Checking the loopback, private and other address scopes as defined in
388  * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
389  * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
390  *
391  * Level 0 - unusable SCTP addresses
392  * Level 1 - loopback address
393  * Level 2 - link-local addresses
394  * Level 3 - private addresses.
395  * Level 4 - global addresses
396  * For INIT and INIT-ACK address list, let L be the level of
397  * of requested destination address, sender and receiver
398  * SHOULD include all of its addresses with level greater
399  * than or equal to L.
400  */
401 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
402 {
403 	sctp_scope_t retval;
404 
405 	/* Should IPv4 scoping be a sysctl configurable option
406 	 * so users can turn it off (default on) for certain
407 	 * unconventional networking environments?
408 	 */
409 
410 	/* Check for unusable SCTP addresses. */
411 	if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
412 		retval =  SCTP_SCOPE_UNUSABLE;
413 	} else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
414 		retval = SCTP_SCOPE_LOOPBACK;
415 	} else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
416 		retval = SCTP_SCOPE_LINK;
417 	} else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
418 		   ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
419 		   ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
420 		retval = SCTP_SCOPE_PRIVATE;
421 	} else {
422 		retval = SCTP_SCOPE_GLOBAL;
423 	}
424 
425 	return retval;
426 }
427 
428 /* Returns a valid dst cache entry for the given source and destination ip
429  * addresses. If an association is passed, trys to get a dst entry with a
430  * source address that matches an address in the bind address list.
431  */
432 static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc,
433 					 union sctp_addr *daddr,
434 					 union sctp_addr *saddr)
435 {
436 	struct rtable *rt;
437 	struct flowi fl;
438 	struct sctp_bind_addr *bp;
439 	struct sctp_sockaddr_entry *laddr;
440 	struct dst_entry *dst = NULL;
441 	union sctp_addr dst_saddr;
442 
443 	memset(&fl, 0x0, sizeof(struct flowi));
444 	fl.fl4_dst  = daddr->v4.sin_addr.s_addr;
445 	fl.proto = IPPROTO_SCTP;
446 	if (asoc) {
447 		fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk);
448 		fl.oif = asoc->base.sk->sk_bound_dev_if;
449 	}
450 	if (saddr)
451 		fl.fl4_src = saddr->v4.sin_addr.s_addr;
452 
453 	SCTP_DEBUG_PRINTK("%s: DST:%u.%u.%u.%u, SRC:%u.%u.%u.%u - ",
454 			  __FUNCTION__, NIPQUAD(fl.fl4_dst),
455 			  NIPQUAD(fl.fl4_src));
456 
457 	if (!ip_route_output_key(&init_net, &rt, &fl)) {
458 		dst = &rt->u.dst;
459 	}
460 
461 	/* If there is no association or if a source address is passed, no
462 	 * more validation is required.
463 	 */
464 	if (!asoc || saddr)
465 		goto out;
466 
467 	bp = &asoc->base.bind_addr;
468 
469 	if (dst) {
470 		/* Walk through the bind address list and look for a bind
471 		 * address that matches the source address of the returned dst.
472 		 */
473 		rcu_read_lock();
474 		list_for_each_entry_rcu(laddr, &bp->address_list, list) {
475 			if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC))
476 				continue;
477 			sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port));
478 			if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
479 				goto out_unlock;
480 		}
481 		rcu_read_unlock();
482 
483 		/* None of the bound addresses match the source address of the
484 		 * dst. So release it.
485 		 */
486 		dst_release(dst);
487 		dst = NULL;
488 	}
489 
490 	/* Walk through the bind address list and try to get a dst that
491 	 * matches a bind address as the source address.
492 	 */
493 	rcu_read_lock();
494 	list_for_each_entry_rcu(laddr, &bp->address_list, list) {
495 		if (!laddr->valid)
496 			continue;
497 		if ((laddr->state == SCTP_ADDR_SRC) &&
498 		    (AF_INET == laddr->a.sa.sa_family)) {
499 			fl.fl4_src = laddr->a.v4.sin_addr.s_addr;
500 			if (!ip_route_output_key(&init_net, &rt, &fl)) {
501 				dst = &rt->u.dst;
502 				goto out_unlock;
503 			}
504 		}
505 	}
506 
507 out_unlock:
508 	rcu_read_unlock();
509 out:
510 	if (dst)
511 		SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n",
512 				  NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_src));
513 	else
514 		SCTP_DEBUG_PRINTK("NO ROUTE\n");
515 
516 	return dst;
517 }
518 
519 /* For v4, the source address is cached in the route entry(dst). So no need
520  * to cache it separately and hence this is an empty routine.
521  */
522 static void sctp_v4_get_saddr(struct sctp_association *asoc,
523 			      struct dst_entry *dst,
524 			      union sctp_addr *daddr,
525 			      union sctp_addr *saddr)
526 {
527 	struct rtable *rt = (struct rtable *)dst;
528 
529 	if (!asoc)
530 		return;
531 
532 	if (rt) {
533 		saddr->v4.sin_family = AF_INET;
534 		saddr->v4.sin_port = htons(asoc->base.bind_addr.port);
535 		saddr->v4.sin_addr.s_addr = rt->rt_src;
536 	}
537 }
538 
539 /* What interface did this skb arrive on? */
540 static int sctp_v4_skb_iif(const struct sk_buff *skb)
541 {
542 	return ((struct rtable *)skb->dst)->rt_iif;
543 }
544 
545 /* Was this packet marked by Explicit Congestion Notification? */
546 static int sctp_v4_is_ce(const struct sk_buff *skb)
547 {
548 	return INET_ECN_is_ce(ip_hdr(skb)->tos);
549 }
550 
551 /* Create and initialize a new sk for the socket returned by accept(). */
552 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
553 					     struct sctp_association *asoc)
554 {
555 	struct inet_sock *inet = inet_sk(sk);
556 	struct inet_sock *newinet;
557 	struct sock *newsk = sk_alloc(sk->sk_net, PF_INET, GFP_KERNEL,
558 			sk->sk_prot);
559 
560 	if (!newsk)
561 		goto out;
562 
563 	sock_init_data(NULL, newsk);
564 
565 	newsk->sk_type = SOCK_STREAM;
566 
567 	newsk->sk_no_check = sk->sk_no_check;
568 	newsk->sk_reuse = sk->sk_reuse;
569 	newsk->sk_shutdown = sk->sk_shutdown;
570 
571 	newsk->sk_destruct = inet_sock_destruct;
572 	newsk->sk_family = PF_INET;
573 	newsk->sk_protocol = IPPROTO_SCTP;
574 	newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
575 	sock_reset_flag(newsk, SOCK_ZAPPED);
576 
577 	newinet = inet_sk(newsk);
578 
579 	/* Initialize sk's sport, dport, rcv_saddr and daddr for
580 	 * getsockname() and getpeername()
581 	 */
582 	newinet->sport = inet->sport;
583 	newinet->saddr = inet->saddr;
584 	newinet->rcv_saddr = inet->rcv_saddr;
585 	newinet->dport = htons(asoc->peer.port);
586 	newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
587 	newinet->pmtudisc = inet->pmtudisc;
588 	newinet->id = asoc->next_tsn ^ jiffies;
589 
590 	newinet->uc_ttl = -1;
591 	newinet->mc_loop = 1;
592 	newinet->mc_ttl = 1;
593 	newinet->mc_index = 0;
594 	newinet->mc_list = NULL;
595 
596 	sk_refcnt_debug_inc(newsk);
597 
598 	if (newsk->sk_prot->init(newsk)) {
599 		sk_common_release(newsk);
600 		newsk = NULL;
601 	}
602 
603 out:
604 	return newsk;
605 }
606 
607 /* Map address, empty for v4 family */
608 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
609 {
610 	/* Empty */
611 }
612 
613 /* Dump the v4 addr to the seq file. */
614 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
615 {
616 	seq_printf(seq, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr));
617 }
618 
619 /* Event handler for inet address addition/deletion events.
620  * The sctp_local_addr_list needs to be protocted by a spin lock since
621  * multiple notifiers (say IPv4 and IPv6) may be running at the same
622  * time and thus corrupt the list.
623  * The reader side is protected with RCU.
624  */
625 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
626 			       void *ptr)
627 {
628 	struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
629 	struct sctp_sockaddr_entry *addr = NULL;
630 	struct sctp_sockaddr_entry *temp;
631 	int found = 0;
632 
633 	switch (ev) {
634 	case NETDEV_UP:
635 		addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
636 		if (addr) {
637 			addr->a.v4.sin_family = AF_INET;
638 			addr->a.v4.sin_port = 0;
639 			addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
640 			addr->valid = 1;
641 			spin_lock_bh(&sctp_local_addr_lock);
642 			list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
643 			spin_unlock_bh(&sctp_local_addr_lock);
644 		}
645 		break;
646 	case NETDEV_DOWN:
647 		spin_lock_bh(&sctp_local_addr_lock);
648 		list_for_each_entry_safe(addr, temp,
649 					&sctp_local_addr_list, list) {
650 			if (addr->a.v4.sin_addr.s_addr == ifa->ifa_local) {
651 				found = 1;
652 				addr->valid = 0;
653 				list_del_rcu(&addr->list);
654 				break;
655 			}
656 		}
657 		spin_unlock_bh(&sctp_local_addr_lock);
658 		if (found)
659 			call_rcu(&addr->rcu, sctp_local_addr_free);
660 		break;
661 	}
662 
663 	return NOTIFY_DONE;
664 }
665 
666 /*
667  * Initialize the control inode/socket with a control endpoint data
668  * structure.  This endpoint is reserved exclusively for the OOTB processing.
669  */
670 static int sctp_ctl_sock_init(void)
671 {
672 	int err;
673 	sa_family_t family;
674 
675 	if (sctp_get_pf_specific(PF_INET6))
676 		family = PF_INET6;
677 	else
678 		family = PF_INET;
679 
680 	err = sock_create_kern(family, SOCK_SEQPACKET, IPPROTO_SCTP,
681 			       &sctp_ctl_socket);
682 	if (err < 0) {
683 		printk(KERN_ERR
684 		       "SCTP: Failed to create the SCTP control socket.\n");
685 		return err;
686 	}
687 	sctp_ctl_socket->sk->sk_allocation = GFP_ATOMIC;
688 	inet_sk(sctp_ctl_socket->sk)->uc_ttl = -1;
689 
690 	return 0;
691 }
692 
693 /* Register address family specific functions. */
694 int sctp_register_af(struct sctp_af *af)
695 {
696 	switch (af->sa_family) {
697 	case AF_INET:
698 		if (sctp_af_v4_specific)
699 			return 0;
700 		sctp_af_v4_specific = af;
701 		break;
702 	case AF_INET6:
703 		if (sctp_af_v6_specific)
704 			return 0;
705 		sctp_af_v6_specific = af;
706 		break;
707 	default:
708 		return 0;
709 	}
710 
711 	INIT_LIST_HEAD(&af->list);
712 	list_add_tail(&af->list, &sctp_address_families);
713 	return 1;
714 }
715 
716 /* Get the table of functions for manipulating a particular address
717  * family.
718  */
719 struct sctp_af *sctp_get_af_specific(sa_family_t family)
720 {
721 	switch (family) {
722 	case AF_INET:
723 		return sctp_af_v4_specific;
724 	case AF_INET6:
725 		return sctp_af_v6_specific;
726 	default:
727 		return NULL;
728 	}
729 }
730 
731 /* Common code to initialize a AF_INET msg_name. */
732 static void sctp_inet_msgname(char *msgname, int *addr_len)
733 {
734 	struct sockaddr_in *sin;
735 
736 	sin = (struct sockaddr_in *)msgname;
737 	*addr_len = sizeof(struct sockaddr_in);
738 	sin->sin_family = AF_INET;
739 	memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
740 }
741 
742 /* Copy the primary address of the peer primary address as the msg_name. */
743 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
744 				    int *addr_len)
745 {
746 	struct sockaddr_in *sin, *sinfrom;
747 
748 	if (msgname) {
749 		struct sctp_association *asoc;
750 
751 		asoc = event->asoc;
752 		sctp_inet_msgname(msgname, addr_len);
753 		sin = (struct sockaddr_in *)msgname;
754 		sinfrom = &asoc->peer.primary_addr.v4;
755 		sin->sin_port = htons(asoc->peer.port);
756 		sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
757 	}
758 }
759 
760 /* Initialize and copy out a msgname from an inbound skb. */
761 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
762 {
763 	if (msgname) {
764 		struct sctphdr *sh = sctp_hdr(skb);
765 		struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
766 
767 		sctp_inet_msgname(msgname, len);
768 		sin->sin_port = sh->source;
769 		sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
770 	}
771 }
772 
773 /* Do we support this AF? */
774 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
775 {
776 	/* PF_INET only supports AF_INET addresses. */
777 	return (AF_INET == family);
778 }
779 
780 /* Address matching with wildcards allowed. */
781 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
782 			      const union sctp_addr *addr2,
783 			      struct sctp_sock *opt)
784 {
785 	/* PF_INET only supports AF_INET addresses. */
786 	if (addr1->sa.sa_family != addr2->sa.sa_family)
787 		return 0;
788 	if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
789 	    htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
790 		return 1;
791 	if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
792 		return 1;
793 
794 	return 0;
795 }
796 
797 /* Verify that provided sockaddr looks bindable.  Common verification has
798  * already been taken care of.
799  */
800 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
801 {
802 	return sctp_v4_available(addr, opt);
803 }
804 
805 /* Verify that sockaddr looks sendable.  Common verification has already
806  * been taken care of.
807  */
808 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
809 {
810 	return 1;
811 }
812 
813 /* Fill in Supported Address Type information for INIT and INIT-ACK
814  * chunks.  Returns number of addresses supported.
815  */
816 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
817 				     __be16 *types)
818 {
819 	types[0] = SCTP_PARAM_IPV4_ADDRESS;
820 	return 1;
821 }
822 
823 /* Wrapper routine that calls the ip transmit routine. */
824 static inline int sctp_v4_xmit(struct sk_buff *skb,
825 			       struct sctp_transport *transport, int ipfragok)
826 {
827 	SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
828 			  "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n",
829 			  __FUNCTION__, skb, skb->len,
830 			  NIPQUAD(((struct rtable *)skb->dst)->rt_src),
831 			  NIPQUAD(((struct rtable *)skb->dst)->rt_dst));
832 
833 	SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
834 	return ip_queue_xmit(skb, ipfragok);
835 }
836 
837 static struct sctp_af sctp_af_inet;
838 
839 static struct sctp_pf sctp_pf_inet = {
840 	.event_msgname = sctp_inet_event_msgname,
841 	.skb_msgname   = sctp_inet_skb_msgname,
842 	.af_supported  = sctp_inet_af_supported,
843 	.cmp_addr      = sctp_inet_cmp_addr,
844 	.bind_verify   = sctp_inet_bind_verify,
845 	.send_verify   = sctp_inet_send_verify,
846 	.supported_addrs = sctp_inet_supported_addrs,
847 	.create_accept_sk = sctp_v4_create_accept_sk,
848 	.addr_v4map	= sctp_v4_addr_v4map,
849 	.af            = &sctp_af_inet
850 };
851 
852 /* Notifier for inetaddr addition/deletion events.  */
853 static struct notifier_block sctp_inetaddr_notifier = {
854 	.notifier_call = sctp_inetaddr_event,
855 };
856 
857 /* Socket operations.  */
858 static const struct proto_ops inet_seqpacket_ops = {
859 	.family		   = PF_INET,
860 	.owner		   = THIS_MODULE,
861 	.release	   = inet_release,	/* Needs to be wrapped... */
862 	.bind		   = inet_bind,
863 	.connect	   = inet_dgram_connect,
864 	.socketpair	   = sock_no_socketpair,
865 	.accept		   = inet_accept,
866 	.getname	   = inet_getname,	/* Semantics are different.  */
867 	.poll		   = sctp_poll,
868 	.ioctl		   = inet_ioctl,
869 	.listen		   = sctp_inet_listen,
870 	.shutdown	   = inet_shutdown,	/* Looks harmless.  */
871 	.setsockopt	   = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
872 	.getsockopt	   = sock_common_getsockopt,
873 	.sendmsg	   = inet_sendmsg,
874 	.recvmsg	   = sock_common_recvmsg,
875 	.mmap		   = sock_no_mmap,
876 	.sendpage	   = sock_no_sendpage,
877 #ifdef CONFIG_COMPAT
878 	.compat_setsockopt = compat_sock_common_setsockopt,
879 	.compat_getsockopt = compat_sock_common_getsockopt,
880 #endif
881 };
882 
883 /* Registration with AF_INET family.  */
884 static struct inet_protosw sctp_seqpacket_protosw = {
885 	.type       = SOCK_SEQPACKET,
886 	.protocol   = IPPROTO_SCTP,
887 	.prot       = &sctp_prot,
888 	.ops        = &inet_seqpacket_ops,
889 	.capability = -1,
890 	.no_check   = 0,
891 	.flags      = SCTP_PROTOSW_FLAG
892 };
893 static struct inet_protosw sctp_stream_protosw = {
894 	.type       = SOCK_STREAM,
895 	.protocol   = IPPROTO_SCTP,
896 	.prot       = &sctp_prot,
897 	.ops        = &inet_seqpacket_ops,
898 	.capability = -1,
899 	.no_check   = 0,
900 	.flags      = SCTP_PROTOSW_FLAG
901 };
902 
903 /* Register with IP layer.  */
904 static struct net_protocol sctp_protocol = {
905 	.handler     = sctp_rcv,
906 	.err_handler = sctp_v4_err,
907 	.no_policy   = 1,
908 };
909 
910 /* IPv4 address related functions.  */
911 static struct sctp_af sctp_af_inet = {
912 	.sa_family	   = AF_INET,
913 	.sctp_xmit	   = sctp_v4_xmit,
914 	.setsockopt	   = ip_setsockopt,
915 	.getsockopt	   = ip_getsockopt,
916 	.get_dst	   = sctp_v4_get_dst,
917 	.get_saddr	   = sctp_v4_get_saddr,
918 	.copy_addrlist	   = sctp_v4_copy_addrlist,
919 	.from_skb	   = sctp_v4_from_skb,
920 	.from_sk	   = sctp_v4_from_sk,
921 	.to_sk_saddr	   = sctp_v4_to_sk_saddr,
922 	.to_sk_daddr	   = sctp_v4_to_sk_daddr,
923 	.from_addr_param   = sctp_v4_from_addr_param,
924 	.to_addr_param	   = sctp_v4_to_addr_param,
925 	.dst_saddr	   = sctp_v4_dst_saddr,
926 	.cmp_addr	   = sctp_v4_cmp_addr,
927 	.addr_valid	   = sctp_v4_addr_valid,
928 	.inaddr_any	   = sctp_v4_inaddr_any,
929 	.is_any		   = sctp_v4_is_any,
930 	.available	   = sctp_v4_available,
931 	.scope		   = sctp_v4_scope,
932 	.skb_iif	   = sctp_v4_skb_iif,
933 	.is_ce		   = sctp_v4_is_ce,
934 	.seq_dump_addr	   = sctp_v4_seq_dump_addr,
935 	.net_header_len	   = sizeof(struct iphdr),
936 	.sockaddr_len	   = sizeof(struct sockaddr_in),
937 #ifdef CONFIG_COMPAT
938 	.compat_setsockopt = compat_ip_setsockopt,
939 	.compat_getsockopt = compat_ip_getsockopt,
940 #endif
941 };
942 
943 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
944 
945 	switch (family) {
946 	case PF_INET:
947 		return sctp_pf_inet_specific;
948 	case PF_INET6:
949 		return sctp_pf_inet6_specific;
950 	default:
951 		return NULL;
952 	}
953 }
954 
955 /* Register the PF specific function table.  */
956 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
957 {
958 	switch (family) {
959 	case PF_INET:
960 		if (sctp_pf_inet_specific)
961 			return 0;
962 		sctp_pf_inet_specific = pf;
963 		break;
964 	case PF_INET6:
965 		if (sctp_pf_inet6_specific)
966 			return 0;
967 		sctp_pf_inet6_specific = pf;
968 		break;
969 	default:
970 		return 0;
971 	}
972 	return 1;
973 }
974 
975 static int __init init_sctp_mibs(void)
976 {
977 	sctp_statistics[0] = alloc_percpu(struct sctp_mib);
978 	if (!sctp_statistics[0])
979 		return -ENOMEM;
980 	sctp_statistics[1] = alloc_percpu(struct sctp_mib);
981 	if (!sctp_statistics[1]) {
982 		free_percpu(sctp_statistics[0]);
983 		return -ENOMEM;
984 	}
985 	return 0;
986 
987 }
988 
989 static void cleanup_sctp_mibs(void)
990 {
991 	free_percpu(sctp_statistics[0]);
992 	free_percpu(sctp_statistics[1]);
993 }
994 
995 static void sctp_v4_pf_init(void)
996 {
997 	/* Initialize the SCTP specific PF functions. */
998 	sctp_register_pf(&sctp_pf_inet, PF_INET);
999 	sctp_register_af(&sctp_af_inet);
1000 }
1001 
1002 static void sctp_v4_pf_exit(void)
1003 {
1004 	list_del(&sctp_af_inet.list);
1005 }
1006 
1007 static int sctp_v4_protosw_init(void)
1008 {
1009 	int rc;
1010 
1011 	rc = proto_register(&sctp_prot, 1);
1012 	if (rc)
1013 		return rc;
1014 
1015 	/* Register SCTP(UDP and TCP style) with socket layer.  */
1016 	inet_register_protosw(&sctp_seqpacket_protosw);
1017 	inet_register_protosw(&sctp_stream_protosw);
1018 
1019 	return 0;
1020 }
1021 
1022 static void sctp_v4_protosw_exit(void)
1023 {
1024 	inet_unregister_protosw(&sctp_stream_protosw);
1025 	inet_unregister_protosw(&sctp_seqpacket_protosw);
1026 	proto_unregister(&sctp_prot);
1027 }
1028 
1029 static int sctp_v4_add_protocol(void)
1030 {
1031 	/* Register notifier for inet address additions/deletions. */
1032 	register_inetaddr_notifier(&sctp_inetaddr_notifier);
1033 
1034 	/* Register SCTP with inet layer.  */
1035 	if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1036 		return -EAGAIN;
1037 
1038 	return 0;
1039 }
1040 
1041 static void sctp_v4_del_protocol(void)
1042 {
1043 	inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1044 	unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1045 }
1046 
1047 /* Initialize the universe into something sensible.  */
1048 SCTP_STATIC __init int sctp_init(void)
1049 {
1050 	int i;
1051 	int status = -EINVAL;
1052 	unsigned long goal;
1053 	unsigned long limit;
1054 	int max_share;
1055 	int order;
1056 
1057 	/* SCTP_DEBUG sanity check. */
1058 	if (!sctp_sanity_check())
1059 		goto out;
1060 
1061 	/* Allocate bind_bucket and chunk caches. */
1062 	status = -ENOBUFS;
1063 	sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1064 					       sizeof(struct sctp_bind_bucket),
1065 					       0, SLAB_HWCACHE_ALIGN,
1066 					       NULL);
1067 	if (!sctp_bucket_cachep)
1068 		goto out;
1069 
1070 	sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1071 					       sizeof(struct sctp_chunk),
1072 					       0, SLAB_HWCACHE_ALIGN,
1073 					       NULL);
1074 	if (!sctp_chunk_cachep)
1075 		goto err_chunk_cachep;
1076 
1077 	/* Allocate and initialise sctp mibs.  */
1078 	status = init_sctp_mibs();
1079 	if (status)
1080 		goto err_init_mibs;
1081 
1082 	/* Initialize proc fs directory.  */
1083 	status = sctp_proc_init();
1084 	if (status)
1085 		goto err_init_proc;
1086 
1087 	/* Initialize object count debugging.  */
1088 	sctp_dbg_objcnt_init();
1089 
1090 	/*
1091 	 * 14. Suggested SCTP Protocol Parameter Values
1092 	 */
1093 	/* The following protocol parameters are RECOMMENDED:  */
1094 	/* RTO.Initial              - 3  seconds */
1095 	sctp_rto_initial		= SCTP_RTO_INITIAL;
1096 	/* RTO.Min                  - 1  second */
1097 	sctp_rto_min	 		= SCTP_RTO_MIN;
1098 	/* RTO.Max                 -  60 seconds */
1099 	sctp_rto_max 			= SCTP_RTO_MAX;
1100 	/* RTO.Alpha                - 1/8 */
1101 	sctp_rto_alpha	        	= SCTP_RTO_ALPHA;
1102 	/* RTO.Beta                 - 1/4 */
1103 	sctp_rto_beta			= SCTP_RTO_BETA;
1104 
1105 	/* Valid.Cookie.Life        - 60  seconds */
1106 	sctp_valid_cookie_life		= SCTP_DEFAULT_COOKIE_LIFE;
1107 
1108 	/* Whether Cookie Preservative is enabled(1) or not(0) */
1109 	sctp_cookie_preserve_enable 	= 1;
1110 
1111 	/* Max.Burst		    - 4 */
1112 	sctp_max_burst 			= SCTP_DEFAULT_MAX_BURST;
1113 
1114 	/* Association.Max.Retrans  - 10 attempts
1115 	 * Path.Max.Retrans         - 5  attempts (per destination address)
1116 	 * Max.Init.Retransmits     - 8  attempts
1117 	 */
1118 	sctp_max_retrans_association 	= 10;
1119 	sctp_max_retrans_path		= 5;
1120 	sctp_max_retrans_init		= 8;
1121 
1122 	/* Sendbuffer growth	    - do per-socket accounting */
1123 	sctp_sndbuf_policy		= 0;
1124 
1125 	/* Rcvbuffer growth	    - do per-socket accounting */
1126 	sctp_rcvbuf_policy		= 0;
1127 
1128 	/* HB.interval              - 30 seconds */
1129 	sctp_hb_interval		= SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1130 
1131 	/* delayed SACK timeout */
1132 	sctp_sack_timeout		= SCTP_DEFAULT_TIMEOUT_SACK;
1133 
1134 	/* Implementation specific variables. */
1135 
1136 	/* Initialize default stream count setup information. */
1137 	sctp_max_instreams    		= SCTP_DEFAULT_INSTREAMS;
1138 	sctp_max_outstreams   		= SCTP_DEFAULT_OUTSTREAMS;
1139 
1140 	/* Initialize handle used for association ids. */
1141 	idr_init(&sctp_assocs_id);
1142 
1143 	/* Set the pressure threshold to be a fraction of global memory that
1144 	 * is up to 1/2 at 256 MB, decreasing toward zero with the amount of
1145 	 * memory, with a floor of 128 pages.
1146 	 * Note this initalizes the data in sctpv6_prot too
1147 	 * Unabashedly stolen from tcp_init
1148 	 */
1149 	limit = min(num_physpages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT);
1150 	limit = (limit * (num_physpages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11);
1151 	limit = max(limit, 128UL);
1152 	sysctl_sctp_mem[0] = limit / 4 * 3;
1153 	sysctl_sctp_mem[1] = limit;
1154 	sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1155 
1156 	/* Set per-socket limits to no more than 1/128 the pressure threshold*/
1157 	limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1158 	max_share = min(4UL*1024*1024, limit);
1159 
1160 	sysctl_sctp_rmem[0] = PAGE_SIZE; /* give each asoc 1 page min */
1161 	sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1));
1162 	sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1163 
1164 	sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1165 	sysctl_sctp_wmem[1] = 16*1024;
1166 	sysctl_sctp_wmem[2] = max(64*1024, max_share);
1167 
1168 	/* Size and allocate the association hash table.
1169 	 * The methodology is similar to that of the tcp hash tables.
1170 	 */
1171 	if (num_physpages >= (128 * 1024))
1172 		goal = num_physpages >> (22 - PAGE_SHIFT);
1173 	else
1174 		goal = num_physpages >> (24 - PAGE_SHIFT);
1175 
1176 	for (order = 0; (1UL << order) < goal; order++)
1177 		;
1178 
1179 	do {
1180 		sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1181 					sizeof(struct sctp_hashbucket);
1182 		if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1183 			continue;
1184 		sctp_assoc_hashtable = (struct sctp_hashbucket *)
1185 					__get_free_pages(GFP_ATOMIC, order);
1186 	} while (!sctp_assoc_hashtable && --order > 0);
1187 	if (!sctp_assoc_hashtable) {
1188 		printk(KERN_ERR "SCTP: Failed association hash alloc.\n");
1189 		status = -ENOMEM;
1190 		goto err_ahash_alloc;
1191 	}
1192 	for (i = 0; i < sctp_assoc_hashsize; i++) {
1193 		rwlock_init(&sctp_assoc_hashtable[i].lock);
1194 		INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
1195 	}
1196 
1197 	/* Allocate and initialize the endpoint hash table.  */
1198 	sctp_ep_hashsize = 64;
1199 	sctp_ep_hashtable = (struct sctp_hashbucket *)
1200 		kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1201 	if (!sctp_ep_hashtable) {
1202 		printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n");
1203 		status = -ENOMEM;
1204 		goto err_ehash_alloc;
1205 	}
1206 	for (i = 0; i < sctp_ep_hashsize; i++) {
1207 		rwlock_init(&sctp_ep_hashtable[i].lock);
1208 		INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1209 	}
1210 
1211 	/* Allocate and initialize the SCTP port hash table.  */
1212 	do {
1213 		sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1214 					sizeof(struct sctp_bind_hashbucket);
1215 		if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1216 			continue;
1217 		sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1218 					__get_free_pages(GFP_ATOMIC, order);
1219 	} while (!sctp_port_hashtable && --order > 0);
1220 	if (!sctp_port_hashtable) {
1221 		printk(KERN_ERR "SCTP: Failed bind hash alloc.");
1222 		status = -ENOMEM;
1223 		goto err_bhash_alloc;
1224 	}
1225 	for (i = 0; i < sctp_port_hashsize; i++) {
1226 		spin_lock_init(&sctp_port_hashtable[i].lock);
1227 		INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1228 	}
1229 
1230 	printk(KERN_INFO "SCTP: Hash tables configured "
1231 			 "(established %d bind %d)\n",
1232 		sctp_assoc_hashsize, sctp_port_hashsize);
1233 
1234 	/* Disable ADDIP by default. */
1235 	sctp_addip_enable = 0;
1236 	sctp_addip_noauth = 0;
1237 
1238 	/* Enable PR-SCTP by default. */
1239 	sctp_prsctp_enable = 1;
1240 
1241 	/* Disable AUTH by default. */
1242 	sctp_auth_enable = 0;
1243 
1244 	sctp_sysctl_register();
1245 
1246 	INIT_LIST_HEAD(&sctp_address_families);
1247 	sctp_v4_pf_init();
1248 	sctp_v6_pf_init();
1249 
1250 	/* Initialize the local address list. */
1251 	INIT_LIST_HEAD(&sctp_local_addr_list);
1252 	spin_lock_init(&sctp_local_addr_lock);
1253 	sctp_get_local_addr_list();
1254 
1255 	status = sctp_v4_protosw_init();
1256 
1257 	if (status)
1258 		goto err_protosw_init;
1259 
1260 	status = sctp_v6_protosw_init();
1261 	if (status)
1262 		goto err_v6_protosw_init;
1263 
1264 	/* Initialize the control inode/socket for handling OOTB packets.  */
1265 	if ((status = sctp_ctl_sock_init())) {
1266 		printk (KERN_ERR
1267 			"SCTP: Failed to initialize the SCTP control sock.\n");
1268 		goto err_ctl_sock_init;
1269 	}
1270 
1271 	status = sctp_v4_add_protocol();
1272 	if (status)
1273 		goto err_add_protocol;
1274 
1275 	/* Register SCTP with inet6 layer.  */
1276 	status = sctp_v6_add_protocol();
1277 	if (status)
1278 		goto err_v6_add_protocol;
1279 
1280 	status = 0;
1281 out:
1282 	return status;
1283 err_v6_add_protocol:
1284 	sctp_v6_del_protocol();
1285 err_add_protocol:
1286 	sctp_v4_del_protocol();
1287 	sock_release(sctp_ctl_socket);
1288 err_ctl_sock_init:
1289 	sctp_v6_protosw_exit();
1290 err_v6_protosw_init:
1291 	sctp_v4_protosw_exit();
1292 err_protosw_init:
1293 	sctp_free_local_addr_list();
1294 	sctp_v4_pf_exit();
1295 	sctp_v6_pf_exit();
1296 	sctp_sysctl_unregister();
1297 	list_del(&sctp_af_inet.list);
1298 	free_pages((unsigned long)sctp_port_hashtable,
1299 		   get_order(sctp_port_hashsize *
1300 			     sizeof(struct sctp_bind_hashbucket)));
1301 err_bhash_alloc:
1302 	kfree(sctp_ep_hashtable);
1303 err_ehash_alloc:
1304 	free_pages((unsigned long)sctp_assoc_hashtable,
1305 		   get_order(sctp_assoc_hashsize *
1306 			     sizeof(struct sctp_hashbucket)));
1307 err_ahash_alloc:
1308 	sctp_dbg_objcnt_exit();
1309 	sctp_proc_exit();
1310 err_init_proc:
1311 	cleanup_sctp_mibs();
1312 err_init_mibs:
1313 	kmem_cache_destroy(sctp_chunk_cachep);
1314 err_chunk_cachep:
1315 	kmem_cache_destroy(sctp_bucket_cachep);
1316 	goto out;
1317 }
1318 
1319 /* Exit handler for the SCTP protocol.  */
1320 SCTP_STATIC __exit void sctp_exit(void)
1321 {
1322 	/* BUG.  This should probably do something useful like clean
1323 	 * up all the remaining associations and all that memory.
1324 	 */
1325 
1326 	/* Unregister with inet6/inet layers. */
1327 	sctp_v6_del_protocol();
1328 	sctp_v4_del_protocol();
1329 
1330 	/* Free the control endpoint.  */
1331 	sock_release(sctp_ctl_socket);
1332 
1333 	/* Free protosw registrations */
1334 	sctp_v6_protosw_exit();
1335 	sctp_v4_protosw_exit();
1336 
1337 	/* Free the local address list.  */
1338 	sctp_free_local_addr_list();
1339 
1340 	/* Unregister with socket layer. */
1341 	sctp_v6_pf_exit();
1342 	sctp_v4_pf_exit();
1343 
1344 	sctp_sysctl_unregister();
1345 	list_del(&sctp_af_inet.list);
1346 
1347 	free_pages((unsigned long)sctp_assoc_hashtable,
1348 		   get_order(sctp_assoc_hashsize *
1349 			     sizeof(struct sctp_hashbucket)));
1350 	kfree(sctp_ep_hashtable);
1351 	free_pages((unsigned long)sctp_port_hashtable,
1352 		   get_order(sctp_port_hashsize *
1353 			     sizeof(struct sctp_bind_hashbucket)));
1354 
1355 	sctp_dbg_objcnt_exit();
1356 	sctp_proc_exit();
1357 	cleanup_sctp_mibs();
1358 
1359 	kmem_cache_destroy(sctp_chunk_cachep);
1360 	kmem_cache_destroy(sctp_bucket_cachep);
1361 }
1362 
1363 module_init(sctp_init);
1364 module_exit(sctp_exit);
1365 
1366 /*
1367  * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1368  */
1369 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1370 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1371 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1372 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1373 MODULE_LICENSE("GPL");
1374