xref: /openbmc/linux/net/sctp/protocol.c (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
1 /* SCTP kernel reference 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 reference Implementation
10  *
11  * Initialization/cleanup for SCTP protocol support.
12  *
13  * The SCTP reference 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  * The SCTP reference 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 <net/protocol.h>
55 #include <net/ip.h>
56 #include <net/ipv6.h>
57 #include <net/sctp/sctp.h>
58 #include <net/addrconf.h>
59 #include <net/inet_common.h>
60 #include <net/inet_ecn.h>
61 
62 /* Global data structures. */
63 struct sctp_globals sctp_globals;
64 struct proc_dir_entry	*proc_net_sctp;
65 DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly;
66 
67 struct idr sctp_assocs_id;
68 DEFINE_SPINLOCK(sctp_assocs_id_lock);
69 
70 /* This is the global socket data structure used for responding to
71  * the Out-of-the-blue (OOTB) packets.  A control sock will be created
72  * for this socket at the initialization time.
73  */
74 static struct socket *sctp_ctl_socket;
75 
76 static struct sctp_pf *sctp_pf_inet6_specific;
77 static struct sctp_pf *sctp_pf_inet_specific;
78 static struct sctp_af *sctp_af_v4_specific;
79 static struct sctp_af *sctp_af_v6_specific;
80 
81 kmem_cache_t *sctp_chunk_cachep __read_mostly;
82 kmem_cache_t *sctp_bucket_cachep __read_mostly;
83 
84 extern int sctp_snmp_proc_init(void);
85 extern int sctp_snmp_proc_exit(void);
86 extern int sctp_eps_proc_init(void);
87 extern int sctp_eps_proc_exit(void);
88 extern int sctp_assocs_proc_init(void);
89 extern int sctp_assocs_proc_exit(void);
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("net/sctp", NULL);
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("net/sctp", NULL);
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 			list_add_tail(&addr->list, addrlist);
163 		}
164 	}
165 
166 	rcu_read_unlock();
167 }
168 
169 /* Extract our IP addresses from the system and stash them in the
170  * protocol structure.
171  */
172 static void __sctp_get_local_addr_list(void)
173 {
174 	struct net_device *dev;
175 	struct list_head *pos;
176 	struct sctp_af *af;
177 
178 	read_lock(&dev_base_lock);
179 	for (dev = dev_base; dev; dev = dev->next) {
180 		__list_for_each(pos, &sctp_address_families) {
181 			af = list_entry(pos, struct sctp_af, list);
182 			af->copy_addrlist(&sctp_local_addr_list, dev);
183 		}
184 	}
185 	read_unlock(&dev_base_lock);
186 }
187 
188 static void sctp_get_local_addr_list(void)
189 {
190 	unsigned long flags;
191 
192 	sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
193 	__sctp_get_local_addr_list();
194 	sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
195 }
196 
197 /* Free the existing local addresses.  */
198 static void __sctp_free_local_addr_list(void)
199 {
200 	struct sctp_sockaddr_entry *addr;
201 	struct list_head *pos, *temp;
202 
203 	list_for_each_safe(pos, temp, &sctp_local_addr_list) {
204 		addr = list_entry(pos, struct sctp_sockaddr_entry, list);
205 		list_del(pos);
206 		kfree(addr);
207 	}
208 }
209 
210 /* Free the existing local addresses.  */
211 static void sctp_free_local_addr_list(void)
212 {
213 	unsigned long flags;
214 
215 	sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
216 	__sctp_free_local_addr_list();
217 	sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
218 }
219 
220 /* Copy the local addresses which are valid for 'scope' into 'bp'.  */
221 int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
222 			      gfp_t gfp, int copy_flags)
223 {
224 	struct sctp_sockaddr_entry *addr;
225 	int error = 0;
226 	struct list_head *pos;
227 	unsigned long flags;
228 
229 	sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
230 	list_for_each(pos, &sctp_local_addr_list) {
231 		addr = list_entry(pos, struct sctp_sockaddr_entry, list);
232 		if (sctp_in_scope(&addr->a, scope)) {
233 			/* Now that the address is in scope, check to see if
234 			 * the address type is really supported by the local
235 			 * sock as well as the remote peer.
236 			 */
237 			if ((((AF_INET == addr->a.sa.sa_family) &&
238 			      (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
239 			    (((AF_INET6 == addr->a.sa.sa_family) &&
240 			      (copy_flags & SCTP_ADDR6_ALLOWED) &&
241 			      (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
242 				error = sctp_add_bind_addr(bp, &addr->a,
243 							   GFP_ATOMIC);
244 				if (error)
245 					goto end_copy;
246 			}
247 		}
248 	}
249 
250 end_copy:
251 	sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
252 	return error;
253 }
254 
255 /* Initialize a sctp_addr from in incoming skb.  */
256 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
257 			     int is_saddr)
258 {
259 	void *from;
260 	__u16 *port;
261 	struct sctphdr *sh;
262 
263 	port = &addr->v4.sin_port;
264 	addr->v4.sin_family = AF_INET;
265 
266 	sh = (struct sctphdr *) skb->h.raw;
267 	if (is_saddr) {
268 		*port  = ntohs(sh->source);
269 		from = &skb->nh.iph->saddr;
270 	} else {
271 		*port = ntohs(sh->dest);
272 		from = &skb->nh.iph->daddr;
273 	}
274 	memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
275 }
276 
277 /* Initialize an sctp_addr from a socket. */
278 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
279 {
280 	addr->v4.sin_family = AF_INET;
281 	addr->v4.sin_port = inet_sk(sk)->num;
282 	addr->v4.sin_addr.s_addr = inet_sk(sk)->rcv_saddr;
283 }
284 
285 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
286 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
287 {
288 	inet_sk(sk)->rcv_saddr = addr->v4.sin_addr.s_addr;
289 }
290 
291 /* Initialize sk->sk_daddr from sctp_addr. */
292 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
293 {
294 	inet_sk(sk)->daddr = addr->v4.sin_addr.s_addr;
295 }
296 
297 /* Initialize a sctp_addr from an address parameter. */
298 static void sctp_v4_from_addr_param(union sctp_addr *addr,
299 				    union sctp_addr_param *param,
300 				    __u16 port, int iif)
301 {
302 	addr->v4.sin_family = AF_INET;
303 	addr->v4.sin_port = port;
304 	addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
305 }
306 
307 /* Initialize an address parameter from a sctp_addr and return the length
308  * of the address parameter.
309  */
310 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
311 				 union sctp_addr_param *param)
312 {
313 	int length = sizeof(sctp_ipv4addr_param_t);
314 
315 	param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
316 	param->v4.param_hdr.length = ntohs(length);
317 	param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
318 
319 	return length;
320 }
321 
322 /* Initialize a sctp_addr from a dst_entry. */
323 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst,
324 			      unsigned short port)
325 {
326 	struct rtable *rt = (struct rtable *)dst;
327 	saddr->v4.sin_family = AF_INET;
328 	saddr->v4.sin_port = port;
329 	saddr->v4.sin_addr.s_addr = rt->rt_src;
330 }
331 
332 /* Compare two addresses exactly. */
333 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
334 			    const union sctp_addr *addr2)
335 {
336 	if (addr1->sa.sa_family != addr2->sa.sa_family)
337 		return 0;
338 	if (addr1->v4.sin_port != addr2->v4.sin_port)
339 		return 0;
340 	if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
341 		return 0;
342 
343 	return 1;
344 }
345 
346 /* Initialize addr struct to INADDR_ANY. */
347 static void sctp_v4_inaddr_any(union sctp_addr *addr, unsigned short port)
348 {
349 	addr->v4.sin_family = AF_INET;
350 	addr->v4.sin_addr.s_addr = INADDR_ANY;
351 	addr->v4.sin_port = port;
352 }
353 
354 /* Is this a wildcard address? */
355 static int sctp_v4_is_any(const union sctp_addr *addr)
356 {
357 	return INADDR_ANY == addr->v4.sin_addr.s_addr;
358 }
359 
360 /* This function checks if the address is a valid address to be used for
361  * SCTP binding.
362  *
363  * Output:
364  * Return 0 - If the address is a non-unicast or an illegal address.
365  * Return 1 - If the address is a unicast.
366  */
367 static int sctp_v4_addr_valid(union sctp_addr *addr, struct sctp_sock *sp)
368 {
369 	/* Is this a non-unicast address or a unusable SCTP address? */
370 	if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr))
371 		return 0;
372 
373 	return 1;
374 }
375 
376 /* Should this be available for binding?   */
377 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
378 {
379 	int ret = inet_addr_type(addr->v4.sin_addr.s_addr);
380 
381 
382 	if (addr->v4.sin_addr.s_addr != INADDR_ANY &&
383 	   ret != RTN_LOCAL &&
384 	   !sp->inet.freebind &&
385 	   !sysctl_ip_nonlocal_bind)
386 		return 0;
387 
388 	return 1;
389 }
390 
391 /* Checking the loopback, private and other address scopes as defined in
392  * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
393  * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
394  *
395  * Level 0 - unusable SCTP addresses
396  * Level 1 - loopback address
397  * Level 2 - link-local addresses
398  * Level 3 - private addresses.
399  * Level 4 - global addresses
400  * For INIT and INIT-ACK address list, let L be the level of
401  * of requested destination address, sender and receiver
402  * SHOULD include all of its addresses with level greater
403  * than or equal to L.
404  */
405 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
406 {
407 	sctp_scope_t retval;
408 
409 	/* Should IPv4 scoping be a sysctl configurable option
410 	 * so users can turn it off (default on) for certain
411 	 * unconventional networking environments?
412 	 */
413 
414 	/* Check for unusable SCTP addresses. */
415 	if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr)) {
416 		retval =  SCTP_SCOPE_UNUSABLE;
417 	} else if (LOOPBACK(addr->v4.sin_addr.s_addr)) {
418 		retval = SCTP_SCOPE_LOOPBACK;
419 	} else if (IS_IPV4_LINK_ADDRESS(&addr->v4.sin_addr.s_addr)) {
420 		retval = SCTP_SCOPE_LINK;
421 	} else if (IS_IPV4_PRIVATE_ADDRESS(&addr->v4.sin_addr.s_addr)) {
422 		retval = SCTP_SCOPE_PRIVATE;
423 	} else {
424 		retval = SCTP_SCOPE_GLOBAL;
425 	}
426 
427 	return retval;
428 }
429 
430 /* Returns a valid dst cache entry for the given source and destination ip
431  * addresses. If an association is passed, trys to get a dst entry with a
432  * source address that matches an address in the bind address list.
433  */
434 static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc,
435 					 union sctp_addr *daddr,
436 					 union sctp_addr *saddr)
437 {
438 	struct rtable *rt;
439 	struct flowi fl;
440 	struct sctp_bind_addr *bp;
441 	rwlock_t *addr_lock;
442 	struct sctp_sockaddr_entry *laddr;
443 	struct list_head *pos;
444 	struct dst_entry *dst = NULL;
445 	union sctp_addr dst_saddr;
446 
447 	memset(&fl, 0x0, sizeof(struct flowi));
448 	fl.fl4_dst  = daddr->v4.sin_addr.s_addr;
449 	fl.proto = IPPROTO_SCTP;
450 	if (asoc) {
451 		fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk);
452 		fl.oif = asoc->base.sk->sk_bound_dev_if;
453 	}
454 	if (saddr)
455 		fl.fl4_src = saddr->v4.sin_addr.s_addr;
456 
457 	SCTP_DEBUG_PRINTK("%s: DST:%u.%u.%u.%u, SRC:%u.%u.%u.%u - ",
458 			  __FUNCTION__, NIPQUAD(fl.fl4_dst),
459 			  NIPQUAD(fl.fl4_src));
460 
461 	if (!ip_route_output_key(&rt, &fl)) {
462 		dst = &rt->u.dst;
463 	}
464 
465 	/* If there is no association or if a source address is passed, no
466 	 * more validation is required.
467 	 */
468 	if (!asoc || saddr)
469 		goto out;
470 
471 	bp = &asoc->base.bind_addr;
472 	addr_lock = &asoc->base.addr_lock;
473 
474 	if (dst) {
475 		/* Walk through the bind address list and look for a bind
476 		 * address that matches the source address of the returned dst.
477 		 */
478 		sctp_read_lock(addr_lock);
479 		list_for_each(pos, &bp->address_list) {
480 			laddr = list_entry(pos, struct sctp_sockaddr_entry,
481 					   list);
482 			sctp_v4_dst_saddr(&dst_saddr, dst, bp->port);
483 			if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
484 				goto out_unlock;
485 		}
486 		sctp_read_unlock(addr_lock);
487 
488 		/* None of the bound addresses match the source address of the
489 		 * dst. So release it.
490 		 */
491 		dst_release(dst);
492 		dst = NULL;
493 	}
494 
495 	/* Walk through the bind address list and try to get a dst that
496 	 * matches a bind address as the source address.
497 	 */
498 	sctp_read_lock(addr_lock);
499 	list_for_each(pos, &bp->address_list) {
500 		laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
501 
502 		if (AF_INET == laddr->a.sa.sa_family) {
503 			fl.fl4_src = laddr->a.v4.sin_addr.s_addr;
504 			if (!ip_route_output_key(&rt, &fl)) {
505 				dst = &rt->u.dst;
506 				goto out_unlock;
507 			}
508 		}
509 	}
510 
511 out_unlock:
512 	sctp_read_unlock(addr_lock);
513 out:
514 	if (dst)
515 		SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n",
516 			  	  NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_src));
517 	else
518 		SCTP_DEBUG_PRINTK("NO ROUTE\n");
519 
520 	return dst;
521 }
522 
523 /* For v4, the source address is cached in the route entry(dst). So no need
524  * to cache it separately and hence this is an empty routine.
525  */
526 static void sctp_v4_get_saddr(struct sctp_association *asoc,
527 			      struct dst_entry *dst,
528 			      union sctp_addr *daddr,
529 			      union sctp_addr *saddr)
530 {
531 	struct rtable *rt = (struct rtable *)dst;
532 
533 	if (rt) {
534 		saddr->v4.sin_family = AF_INET;
535 		saddr->v4.sin_port = asoc->base.bind_addr.port;
536 		saddr->v4.sin_addr.s_addr = rt->rt_src;
537 	}
538 }
539 
540 /* What interface did this skb arrive on? */
541 static int sctp_v4_skb_iif(const struct sk_buff *skb)
542 {
543      	return ((struct rtable *)skb->dst)->rt_iif;
544 }
545 
546 /* Was this packet marked by Explicit Congestion Notification? */
547 static int sctp_v4_is_ce(const struct sk_buff *skb)
548 {
549 	return INET_ECN_is_ce(skb->nh.iph->tos);
550 }
551 
552 /* Create and initialize a new sk for the socket returned by accept(). */
553 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
554 					     struct sctp_association *asoc)
555 {
556 	struct inet_sock *inet = inet_sk(sk);
557 	struct inet_sock *newinet;
558 	struct sock *newsk = sk_alloc(PF_INET, GFP_KERNEL, sk->sk_prot, 1);
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 = 0;
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  * Basically, whenever there is an event, we re-build our local address list.
621  */
622 int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
623                         void *ptr)
624 {
625 	unsigned long flags;
626 
627 	sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
628 	__sctp_free_local_addr_list();
629 	__sctp_get_local_addr_list();
630 	sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
631 
632 	return NOTIFY_DONE;
633 }
634 
635 /*
636  * Initialize the control inode/socket with a control endpoint data
637  * structure.  This endpoint is reserved exclusively for the OOTB processing.
638  */
639 static int sctp_ctl_sock_init(void)
640 {
641 	int err;
642 	sa_family_t family;
643 
644 	if (sctp_get_pf_specific(PF_INET6))
645 		family = PF_INET6;
646 	else
647 		family = PF_INET;
648 
649 	err = sock_create_kern(family, SOCK_SEQPACKET, IPPROTO_SCTP,
650 			       &sctp_ctl_socket);
651 	if (err < 0) {
652 		printk(KERN_ERR
653 		       "SCTP: Failed to create the SCTP control socket.\n");
654 		return err;
655 	}
656 	sctp_ctl_socket->sk->sk_allocation = GFP_ATOMIC;
657 	inet_sk(sctp_ctl_socket->sk)->uc_ttl = -1;
658 
659 	return 0;
660 }
661 
662 /* Register address family specific functions. */
663 int sctp_register_af(struct sctp_af *af)
664 {
665 	switch (af->sa_family) {
666 	case AF_INET:
667 		if (sctp_af_v4_specific)
668 			return 0;
669 		sctp_af_v4_specific = af;
670 		break;
671 	case AF_INET6:
672 		if (sctp_af_v6_specific)
673 			return 0;
674 		sctp_af_v6_specific = af;
675 		break;
676 	default:
677 		return 0;
678 	}
679 
680 	INIT_LIST_HEAD(&af->list);
681 	list_add_tail(&af->list, &sctp_address_families);
682 	return 1;
683 }
684 
685 /* Get the table of functions for manipulating a particular address
686  * family.
687  */
688 struct sctp_af *sctp_get_af_specific(sa_family_t family)
689 {
690 	switch (family) {
691 	case AF_INET:
692 		return sctp_af_v4_specific;
693 	case AF_INET6:
694 		return sctp_af_v6_specific;
695 	default:
696 		return NULL;
697 	}
698 }
699 
700 /* Common code to initialize a AF_INET msg_name. */
701 static void sctp_inet_msgname(char *msgname, int *addr_len)
702 {
703 	struct sockaddr_in *sin;
704 
705 	sin = (struct sockaddr_in *)msgname;
706 	*addr_len = sizeof(struct sockaddr_in);
707 	sin->sin_family = AF_INET;
708 	memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
709 }
710 
711 /* Copy the primary address of the peer primary address as the msg_name. */
712 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
713 				    int *addr_len)
714 {
715 	struct sockaddr_in *sin, *sinfrom;
716 
717 	if (msgname) {
718 		struct sctp_association *asoc;
719 
720 		asoc = event->asoc;
721 		sctp_inet_msgname(msgname, addr_len);
722 		sin = (struct sockaddr_in *)msgname;
723 		sinfrom = &asoc->peer.primary_addr.v4;
724 		sin->sin_port = htons(asoc->peer.port);
725 		sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
726 	}
727 }
728 
729 /* Initialize and copy out a msgname from an inbound skb. */
730 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
731 {
732 	struct sctphdr *sh;
733 	struct sockaddr_in *sin;
734 
735 	if (msgname) {
736 		sctp_inet_msgname(msgname, len);
737 		sin = (struct sockaddr_in *)msgname;
738 		sh = (struct sctphdr *)skb->h.raw;
739 		sin->sin_port = sh->source;
740 		sin->sin_addr.s_addr = skb->nh.iph->saddr;
741 	}
742 }
743 
744 /* Do we support this AF? */
745 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
746 {
747 	/* PF_INET only supports AF_INET addresses. */
748 	return (AF_INET == family);
749 }
750 
751 /* Address matching with wildcards allowed. */
752 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
753 			      const union sctp_addr *addr2,
754 			      struct sctp_sock *opt)
755 {
756 	/* PF_INET only supports AF_INET addresses. */
757 	if (addr1->sa.sa_family != addr2->sa.sa_family)
758 		return 0;
759 	if (INADDR_ANY == addr1->v4.sin_addr.s_addr ||
760 	    INADDR_ANY == addr2->v4.sin_addr.s_addr)
761 		return 1;
762 	if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
763 		return 1;
764 
765 	return 0;
766 }
767 
768 /* Verify that provided sockaddr looks bindable.  Common verification has
769  * already been taken care of.
770  */
771 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
772 {
773 	return sctp_v4_available(addr, opt);
774 }
775 
776 /* Verify that sockaddr looks sendable.  Common verification has already
777  * been taken care of.
778  */
779 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
780 {
781 	return 1;
782 }
783 
784 /* Fill in Supported Address Type information for INIT and INIT-ACK
785  * chunks.  Returns number of addresses supported.
786  */
787 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
788 				     __u16 *types)
789 {
790 	types[0] = SCTP_PARAM_IPV4_ADDRESS;
791 	return 1;
792 }
793 
794 /* Wrapper routine that calls the ip transmit routine. */
795 static inline int sctp_v4_xmit(struct sk_buff *skb,
796 			       struct sctp_transport *transport, int ipfragok)
797 {
798 	SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
799 			  "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n",
800 			  __FUNCTION__, skb, skb->len,
801 			  NIPQUAD(((struct rtable *)skb->dst)->rt_src),
802 			  NIPQUAD(((struct rtable *)skb->dst)->rt_dst));
803 
804 	SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
805 	return ip_queue_xmit(skb, ipfragok);
806 }
807 
808 static struct sctp_af sctp_ipv4_specific;
809 
810 static struct sctp_pf sctp_pf_inet = {
811 	.event_msgname = sctp_inet_event_msgname,
812 	.skb_msgname   = sctp_inet_skb_msgname,
813 	.af_supported  = sctp_inet_af_supported,
814 	.cmp_addr      = sctp_inet_cmp_addr,
815 	.bind_verify   = sctp_inet_bind_verify,
816 	.send_verify   = sctp_inet_send_verify,
817 	.supported_addrs = sctp_inet_supported_addrs,
818 	.create_accept_sk = sctp_v4_create_accept_sk,
819 	.addr_v4map	= sctp_v4_addr_v4map,
820 	.af            = &sctp_ipv4_specific,
821 };
822 
823 /* Notifier for inetaddr addition/deletion events.  */
824 static struct notifier_block sctp_inetaddr_notifier = {
825 	.notifier_call = sctp_inetaddr_event,
826 };
827 
828 /* Socket operations.  */
829 static struct proto_ops inet_seqpacket_ops = {
830 	.family      = PF_INET,
831 	.owner       = THIS_MODULE,
832 	.release     = inet_release,       /* Needs to be wrapped... */
833 	.bind        = inet_bind,
834 	.connect     = inet_dgram_connect,
835 	.socketpair  = sock_no_socketpair,
836 	.accept      = inet_accept,
837 	.getname     = inet_getname,      /* Semantics are different.  */
838 	.poll        = sctp_poll,
839 	.ioctl       = inet_ioctl,
840 	.listen      = sctp_inet_listen,
841 	.shutdown    = inet_shutdown,     /* Looks harmless.  */
842 	.setsockopt  = sock_common_setsockopt,   /* IP_SOL IP_OPTION is a problem. */
843 	.getsockopt  = sock_common_getsockopt,
844 	.sendmsg     = inet_sendmsg,
845 	.recvmsg     = sock_common_recvmsg,
846 	.mmap        = sock_no_mmap,
847 	.sendpage    = sock_no_sendpage,
848 };
849 
850 /* Registration with AF_INET family.  */
851 static struct inet_protosw sctp_seqpacket_protosw = {
852 	.type       = SOCK_SEQPACKET,
853 	.protocol   = IPPROTO_SCTP,
854 	.prot       = &sctp_prot,
855 	.ops        = &inet_seqpacket_ops,
856 	.capability = -1,
857 	.no_check   = 0,
858 	.flags      = SCTP_PROTOSW_FLAG
859 };
860 static struct inet_protosw sctp_stream_protosw = {
861 	.type       = SOCK_STREAM,
862 	.protocol   = IPPROTO_SCTP,
863 	.prot       = &sctp_prot,
864 	.ops        = &inet_seqpacket_ops,
865 	.capability = -1,
866 	.no_check   = 0,
867 	.flags      = SCTP_PROTOSW_FLAG
868 };
869 
870 /* Register with IP layer.  */
871 static struct net_protocol sctp_protocol = {
872 	.handler     = sctp_rcv,
873 	.err_handler = sctp_v4_err,
874 	.no_policy   = 1,
875 };
876 
877 /* IPv4 address related functions.  */
878 static struct sctp_af sctp_ipv4_specific = {
879 	.sctp_xmit      = sctp_v4_xmit,
880 	.setsockopt     = ip_setsockopt,
881 	.getsockopt     = ip_getsockopt,
882 	.get_dst	= sctp_v4_get_dst,
883 	.get_saddr	= sctp_v4_get_saddr,
884 	.copy_addrlist  = sctp_v4_copy_addrlist,
885 	.from_skb       = sctp_v4_from_skb,
886 	.from_sk        = sctp_v4_from_sk,
887 	.to_sk_saddr    = sctp_v4_to_sk_saddr,
888 	.to_sk_daddr    = sctp_v4_to_sk_daddr,
889 	.from_addr_param= sctp_v4_from_addr_param,
890 	.to_addr_param  = sctp_v4_to_addr_param,
891 	.dst_saddr      = sctp_v4_dst_saddr,
892 	.cmp_addr       = sctp_v4_cmp_addr,
893 	.addr_valid     = sctp_v4_addr_valid,
894 	.inaddr_any     = sctp_v4_inaddr_any,
895 	.is_any         = sctp_v4_is_any,
896 	.available      = sctp_v4_available,
897 	.scope          = sctp_v4_scope,
898 	.skb_iif        = sctp_v4_skb_iif,
899 	.is_ce          = sctp_v4_is_ce,
900 	.seq_dump_addr  = sctp_v4_seq_dump_addr,
901 	.net_header_len = sizeof(struct iphdr),
902 	.sockaddr_len   = sizeof(struct sockaddr_in),
903 	.sa_family      = AF_INET,
904 };
905 
906 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
907 
908 	switch (family) {
909 	case PF_INET:
910 		return sctp_pf_inet_specific;
911 	case PF_INET6:
912 		return sctp_pf_inet6_specific;
913 	default:
914 		return NULL;
915 	}
916 }
917 
918 /* Register the PF specific function table.  */
919 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
920 {
921 	switch (family) {
922 	case PF_INET:
923 		if (sctp_pf_inet_specific)
924 			return 0;
925 		sctp_pf_inet_specific = pf;
926 		break;
927 	case PF_INET6:
928 		if (sctp_pf_inet6_specific)
929 			return 0;
930 		sctp_pf_inet6_specific = pf;
931 		break;
932 	default:
933 		return 0;
934 	}
935 	return 1;
936 }
937 
938 static int __init init_sctp_mibs(void)
939 {
940 	sctp_statistics[0] = alloc_percpu(struct sctp_mib);
941 	if (!sctp_statistics[0])
942 		return -ENOMEM;
943 	sctp_statistics[1] = alloc_percpu(struct sctp_mib);
944 	if (!sctp_statistics[1]) {
945 		free_percpu(sctp_statistics[0]);
946 		return -ENOMEM;
947 	}
948 	return 0;
949 
950 }
951 
952 static void cleanup_sctp_mibs(void)
953 {
954 	free_percpu(sctp_statistics[0]);
955 	free_percpu(sctp_statistics[1]);
956 }
957 
958 /* Initialize the universe into something sensible.  */
959 SCTP_STATIC __init int sctp_init(void)
960 {
961 	int i;
962 	int status = -EINVAL;
963 	unsigned long goal;
964 	int order;
965 
966 	/* SCTP_DEBUG sanity check. */
967 	if (!sctp_sanity_check())
968 		goto out;
969 
970 	status = proto_register(&sctp_prot, 1);
971 	if (status)
972 		goto out;
973 
974 	/* Add SCTP to inet_protos hash table.  */
975 	status = -EAGAIN;
976 	if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
977 		goto err_add_protocol;
978 
979 	/* Add SCTP(TCP and UDP style) to inetsw linked list.  */
980 	inet_register_protosw(&sctp_seqpacket_protosw);
981 	inet_register_protosw(&sctp_stream_protosw);
982 
983 	/* Allocate a cache pools. */
984 	status = -ENOBUFS;
985 	sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
986 					       sizeof(struct sctp_bind_bucket),
987 					       0, SLAB_HWCACHE_ALIGN,
988 					       NULL, NULL);
989 
990 	if (!sctp_bucket_cachep)
991 		goto err_bucket_cachep;
992 
993 	sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
994 					       sizeof(struct sctp_chunk),
995 					       0, SLAB_HWCACHE_ALIGN,
996 					       NULL, NULL);
997 	if (!sctp_chunk_cachep)
998 		goto err_chunk_cachep;
999 
1000 	/* Allocate and initialise sctp mibs.  */
1001 	status = init_sctp_mibs();
1002 	if (status)
1003 		goto err_init_mibs;
1004 
1005 	/* Initialize proc fs directory.  */
1006 	status = sctp_proc_init();
1007 	if (status)
1008 		goto err_init_proc;
1009 
1010 	/* Initialize object count debugging.  */
1011 	sctp_dbg_objcnt_init();
1012 
1013 	/* Initialize the SCTP specific PF functions. */
1014 	sctp_register_pf(&sctp_pf_inet, PF_INET);
1015 	/*
1016 	 * 14. Suggested SCTP Protocol Parameter Values
1017 	 */
1018 	/* The following protocol parameters are RECOMMENDED:  */
1019 	/* RTO.Initial              - 3  seconds */
1020 	sctp_rto_initial		= SCTP_RTO_INITIAL;
1021 	/* RTO.Min                  - 1  second */
1022 	sctp_rto_min	 		= SCTP_RTO_MIN;
1023 	/* RTO.Max                 -  60 seconds */
1024 	sctp_rto_max 			= SCTP_RTO_MAX;
1025 	/* RTO.Alpha                - 1/8 */
1026 	sctp_rto_alpha	        	= SCTP_RTO_ALPHA;
1027 	/* RTO.Beta                 - 1/4 */
1028 	sctp_rto_beta			= SCTP_RTO_BETA;
1029 
1030 	/* Valid.Cookie.Life        - 60  seconds */
1031 	sctp_valid_cookie_life		= 60 * HZ;
1032 
1033 	/* Whether Cookie Preservative is enabled(1) or not(0) */
1034 	sctp_cookie_preserve_enable 	= 1;
1035 
1036 	/* Max.Burst		    - 4 */
1037 	sctp_max_burst 			= SCTP_MAX_BURST;
1038 
1039 	/* Association.Max.Retrans  - 10 attempts
1040 	 * Path.Max.Retrans         - 5  attempts (per destination address)
1041 	 * Max.Init.Retransmits     - 8  attempts
1042 	 */
1043 	sctp_max_retrans_association 	= 10;
1044 	sctp_max_retrans_path		= 5;
1045 	sctp_max_retrans_init		= 8;
1046 
1047 	/* Sendbuffer growth	    - do per-socket accounting */
1048 	sctp_sndbuf_policy		= 0;
1049 
1050 	/* HB.interval              - 30 seconds */
1051 	sctp_hb_interval		= SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1052 
1053 	/* delayed SACK timeout */
1054 	sctp_sack_timeout		= SCTP_DEFAULT_TIMEOUT_SACK;
1055 
1056 	/* Implementation specific variables. */
1057 
1058 	/* Initialize default stream count setup information. */
1059 	sctp_max_instreams    		= SCTP_DEFAULT_INSTREAMS;
1060 	sctp_max_outstreams   		= SCTP_DEFAULT_OUTSTREAMS;
1061 
1062 	/* Initialize handle used for association ids. */
1063 	idr_init(&sctp_assocs_id);
1064 
1065 	/* Size and allocate the association hash table.
1066 	 * The methodology is similar to that of the tcp hash tables.
1067 	 */
1068 	if (num_physpages >= (128 * 1024))
1069 		goal = num_physpages >> (22 - PAGE_SHIFT);
1070 	else
1071 		goal = num_physpages >> (24 - PAGE_SHIFT);
1072 
1073 	for (order = 0; (1UL << order) < goal; order++)
1074 		;
1075 
1076 	do {
1077 		sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1078 					sizeof(struct sctp_hashbucket);
1079 		if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1080 			continue;
1081 		sctp_assoc_hashtable = (struct sctp_hashbucket *)
1082 					__get_free_pages(GFP_ATOMIC, order);
1083 	} while (!sctp_assoc_hashtable && --order > 0);
1084 	if (!sctp_assoc_hashtable) {
1085 		printk(KERN_ERR "SCTP: Failed association hash alloc.\n");
1086 		status = -ENOMEM;
1087 		goto err_ahash_alloc;
1088 	}
1089 	for (i = 0; i < sctp_assoc_hashsize; i++) {
1090 		rwlock_init(&sctp_assoc_hashtable[i].lock);
1091 		sctp_assoc_hashtable[i].chain = NULL;
1092 	}
1093 
1094 	/* Allocate and initialize the endpoint hash table.  */
1095 	sctp_ep_hashsize = 64;
1096 	sctp_ep_hashtable = (struct sctp_hashbucket *)
1097 		kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1098 	if (!sctp_ep_hashtable) {
1099 		printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n");
1100 		status = -ENOMEM;
1101 		goto err_ehash_alloc;
1102 	}
1103 	for (i = 0; i < sctp_ep_hashsize; i++) {
1104 		rwlock_init(&sctp_ep_hashtable[i].lock);
1105 		sctp_ep_hashtable[i].chain = NULL;
1106 	}
1107 
1108 	/* Allocate and initialize the SCTP port hash table.  */
1109 	do {
1110 		sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1111 					sizeof(struct sctp_bind_hashbucket);
1112 		if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1113 			continue;
1114 		sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1115 					__get_free_pages(GFP_ATOMIC, order);
1116 	} while (!sctp_port_hashtable && --order > 0);
1117 	if (!sctp_port_hashtable) {
1118 		printk(KERN_ERR "SCTP: Failed bind hash alloc.");
1119 		status = -ENOMEM;
1120 		goto err_bhash_alloc;
1121 	}
1122 	for (i = 0; i < sctp_port_hashsize; i++) {
1123 		spin_lock_init(&sctp_port_hashtable[i].lock);
1124 		sctp_port_hashtable[i].chain = NULL;
1125 	}
1126 
1127 	spin_lock_init(&sctp_port_alloc_lock);
1128 	sctp_port_rover = sysctl_local_port_range[0] - 1;
1129 
1130 	printk(KERN_INFO "SCTP: Hash tables configured "
1131 			 "(established %d bind %d)\n",
1132 		sctp_assoc_hashsize, sctp_port_hashsize);
1133 
1134 	/* Disable ADDIP by default. */
1135 	sctp_addip_enable = 0;
1136 
1137 	/* Enable PR-SCTP by default. */
1138 	sctp_prsctp_enable = 1;
1139 
1140 	sctp_sysctl_register();
1141 
1142 	INIT_LIST_HEAD(&sctp_address_families);
1143 	sctp_register_af(&sctp_ipv4_specific);
1144 
1145 	status = sctp_v6_init();
1146 	if (status)
1147 		goto err_v6_init;
1148 
1149 	/* Initialize the control inode/socket for handling OOTB packets.  */
1150 	if ((status = sctp_ctl_sock_init())) {
1151 		printk (KERN_ERR
1152 			"SCTP: Failed to initialize the SCTP control sock.\n");
1153 		goto err_ctl_sock_init;
1154 	}
1155 
1156 	/* Initialize the local address list. */
1157 	INIT_LIST_HEAD(&sctp_local_addr_list);
1158 	spin_lock_init(&sctp_local_addr_lock);
1159 
1160 	/* Register notifier for inet address additions/deletions. */
1161 	register_inetaddr_notifier(&sctp_inetaddr_notifier);
1162 
1163 	sctp_get_local_addr_list();
1164 
1165 	__unsafe(THIS_MODULE);
1166 	status = 0;
1167 out:
1168 	return status;
1169 err_ctl_sock_init:
1170 	sctp_v6_exit();
1171 err_v6_init:
1172 	sctp_sysctl_unregister();
1173 	list_del(&sctp_ipv4_specific.list);
1174 	free_pages((unsigned long)sctp_port_hashtable,
1175 		   get_order(sctp_port_hashsize *
1176 			     sizeof(struct sctp_bind_hashbucket)));
1177 err_bhash_alloc:
1178 	kfree(sctp_ep_hashtable);
1179 err_ehash_alloc:
1180 	free_pages((unsigned long)sctp_assoc_hashtable,
1181 		   get_order(sctp_assoc_hashsize *
1182 			     sizeof(struct sctp_hashbucket)));
1183 err_ahash_alloc:
1184 	sctp_dbg_objcnt_exit();
1185 err_init_proc:
1186 	sctp_proc_exit();
1187 	cleanup_sctp_mibs();
1188 err_init_mibs:
1189 	kmem_cache_destroy(sctp_chunk_cachep);
1190 err_chunk_cachep:
1191 	kmem_cache_destroy(sctp_bucket_cachep);
1192 err_bucket_cachep:
1193 	inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1194 	inet_unregister_protosw(&sctp_seqpacket_protosw);
1195 	inet_unregister_protosw(&sctp_stream_protosw);
1196 err_add_protocol:
1197 	proto_unregister(&sctp_prot);
1198 	goto out;
1199 }
1200 
1201 /* Exit handler for the SCTP protocol.  */
1202 SCTP_STATIC __exit void sctp_exit(void)
1203 {
1204 	/* BUG.  This should probably do something useful like clean
1205 	 * up all the remaining associations and all that memory.
1206 	 */
1207 
1208 	/* Unregister notifier for inet address additions/deletions. */
1209 	unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1210 
1211 	/* Free the local address list.  */
1212 	sctp_free_local_addr_list();
1213 
1214 	/* Free the control endpoint.  */
1215 	sock_release(sctp_ctl_socket);
1216 
1217 	sctp_v6_exit();
1218 	sctp_sysctl_unregister();
1219 	list_del(&sctp_ipv4_specific.list);
1220 
1221 	free_pages((unsigned long)sctp_assoc_hashtable,
1222 		   get_order(sctp_assoc_hashsize *
1223 			     sizeof(struct sctp_hashbucket)));
1224 	kfree(sctp_ep_hashtable);
1225 	free_pages((unsigned long)sctp_port_hashtable,
1226 		   get_order(sctp_port_hashsize *
1227 			     sizeof(struct sctp_bind_hashbucket)));
1228 
1229 	kmem_cache_destroy(sctp_chunk_cachep);
1230 	kmem_cache_destroy(sctp_bucket_cachep);
1231 
1232 	sctp_dbg_objcnt_exit();
1233 	sctp_proc_exit();
1234 	cleanup_sctp_mibs();
1235 
1236 	inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1237 	inet_unregister_protosw(&sctp_seqpacket_protosw);
1238 	inet_unregister_protosw(&sctp_stream_protosw);
1239 	proto_unregister(&sctp_prot);
1240 }
1241 
1242 module_init(sctp_init);
1243 module_exit(sctp_exit);
1244 
1245 /*
1246  * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1247  */
1248 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1249 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1250 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1251 MODULE_LICENSE("GPL");
1252