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, see
27 * <http://www.gnu.org/licenses/>.
28 *
29 * Please send any bug reports or fixes you make to the
30 * email address(es):
31 * lksctp developers <linux-sctp@vger.kernel.org>
32 *
33 * Written or modified by:
34 * La Monte H.P. Yarroll <piggy@acm.org>
35 * Karl Knutson <karl@athena.chicago.il.us>
36 * Jon Grimm <jgrimm@us.ibm.com>
37 * Sridhar Samudrala <sri@us.ibm.com>
38 * Daisy Chang <daisyc@us.ibm.com>
39 * Ardelle Fan <ardelle.fan@intel.com>
40 */
41
42 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
43
44 #include <linux/module.h>
45 #include <linux/init.h>
46 #include <linux/netdevice.h>
47 #include <linux/inetdevice.h>
48 #include <linux/seq_file.h>
49 #include <linux/bootmem.h>
50 #include <linux/highmem.h>
51 #include <linux/swap.h>
52 #include <linux/slab.h>
53 #include <net/net_namespace.h>
54 #include <net/protocol.h>
55 #include <net/ip.h>
56 #include <net/ipv6.h>
57 #include <net/route.h>
58 #include <net/sctp/sctp.h>
59 #include <net/addrconf.h>
60 #include <net/inet_common.h>
61 #include <net/inet_ecn.h>
62
63 #define MAX_SCTP_PORT_HASH_ENTRIES (64 * 1024)
64
65 /* Global data structures. */
66 struct sctp_globals sctp_globals __read_mostly;
67
68 struct idr sctp_assocs_id;
69 DEFINE_SPINLOCK(sctp_assocs_id_lock);
70
71 static struct sctp_pf *sctp_pf_inet6_specific;
72 static struct sctp_pf *sctp_pf_inet_specific;
73 static struct sctp_af *sctp_af_v4_specific;
74 static struct sctp_af *sctp_af_v6_specific;
75
76 struct kmem_cache *sctp_chunk_cachep __read_mostly;
77 struct kmem_cache *sctp_bucket_cachep __read_mostly;
78
79 long sysctl_sctp_mem[3];
80 int sysctl_sctp_rmem[3];
81 int sysctl_sctp_wmem[3];
82
83 /* Set up the proc fs entry for the SCTP protocol. */
sctp_proc_init(struct net * net)84 static int __net_init sctp_proc_init(struct net *net)
85 {
86 #ifdef CONFIG_PROC_FS
87 net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net);
88 if (!net->sctp.proc_net_sctp)
89 goto out_proc_net_sctp;
90 if (sctp_snmp_proc_init(net))
91 goto out_snmp_proc_init;
92 if (sctp_eps_proc_init(net))
93 goto out_eps_proc_init;
94 if (sctp_assocs_proc_init(net))
95 goto out_assocs_proc_init;
96 if (sctp_remaddr_proc_init(net))
97 goto out_remaddr_proc_init;
98
99 return 0;
100
101 out_remaddr_proc_init:
102 sctp_assocs_proc_exit(net);
103 out_assocs_proc_init:
104 sctp_eps_proc_exit(net);
105 out_eps_proc_init:
106 sctp_snmp_proc_exit(net);
107 out_snmp_proc_init:
108 remove_proc_entry("sctp", net->proc_net);
109 net->sctp.proc_net_sctp = NULL;
110 out_proc_net_sctp:
111 return -ENOMEM;
112 #endif /* CONFIG_PROC_FS */
113 return 0;
114 }
115
116 /* Clean up the proc fs entry for the SCTP protocol.
117 * Note: Do not make this __exit as it is used in the init error
118 * path.
119 */
sctp_proc_exit(struct net * net)120 static void sctp_proc_exit(struct net *net)
121 {
122 #ifdef CONFIG_PROC_FS
123 sctp_snmp_proc_exit(net);
124 sctp_eps_proc_exit(net);
125 sctp_assocs_proc_exit(net);
126 sctp_remaddr_proc_exit(net);
127
128 remove_proc_entry("sctp", net->proc_net);
129 net->sctp.proc_net_sctp = NULL;
130 #endif
131 }
132
133 /* Private helper to extract ipv4 address and stash them in
134 * the protocol structure.
135 */
sctp_v4_copy_addrlist(struct list_head * addrlist,struct net_device * dev)136 static void sctp_v4_copy_addrlist(struct list_head *addrlist,
137 struct net_device *dev)
138 {
139 struct in_device *in_dev;
140 struct in_ifaddr *ifa;
141 struct sctp_sockaddr_entry *addr;
142
143 rcu_read_lock();
144 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
145 rcu_read_unlock();
146 return;
147 }
148
149 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
150 /* Add the address to the local list. */
151 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
152 if (addr) {
153 addr->a.v4.sin_family = AF_INET;
154 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
155 addr->valid = 1;
156 INIT_LIST_HEAD(&addr->list);
157 list_add_tail(&addr->list, addrlist);
158 }
159 }
160
161 rcu_read_unlock();
162 }
163
164 /* Extract our IP addresses from the system and stash them in the
165 * protocol structure.
166 */
sctp_get_local_addr_list(struct net * net)167 static void sctp_get_local_addr_list(struct net *net)
168 {
169 struct net_device *dev;
170 struct list_head *pos;
171 struct sctp_af *af;
172
173 rcu_read_lock();
174 for_each_netdev_rcu(net, dev) {
175 list_for_each(pos, &sctp_address_families) {
176 af = list_entry(pos, struct sctp_af, list);
177 af->copy_addrlist(&net->sctp.local_addr_list, dev);
178 }
179 }
180 rcu_read_unlock();
181 }
182
183 /* Free the existing local addresses. */
sctp_free_local_addr_list(struct net * net)184 static void sctp_free_local_addr_list(struct net *net)
185 {
186 struct sctp_sockaddr_entry *addr;
187 struct list_head *pos, *temp;
188
189 list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
190 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
191 list_del(pos);
192 kfree(addr);
193 }
194 }
195
196 /* Copy the local addresses which are valid for 'scope' into 'bp'. */
sctp_copy_local_addr_list(struct net * net,struct sctp_bind_addr * bp,sctp_scope_t scope,gfp_t gfp,int copy_flags)197 int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
198 sctp_scope_t scope, gfp_t gfp, int copy_flags)
199 {
200 struct sctp_sockaddr_entry *addr;
201 int error = 0;
202
203 rcu_read_lock();
204 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
205 if (!addr->valid)
206 continue;
207 if (sctp_in_scope(net, &addr->a, scope)) {
208 /* Now that the address is in scope, check to see if
209 * the address type is really supported by the local
210 * sock as well as the remote peer.
211 */
212 if ((((AF_INET == addr->a.sa.sa_family) &&
213 (copy_flags & SCTP_ADDR4_ALLOWED) &&
214 (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
215 (((AF_INET6 == addr->a.sa.sa_family) &&
216 (copy_flags & SCTP_ADDR6_ALLOWED) &&
217 (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
218 error = sctp_add_bind_addr(bp, &addr->a,
219 SCTP_ADDR_SRC, GFP_ATOMIC);
220 if (error)
221 goto end_copy;
222 }
223 }
224 }
225
226 end_copy:
227 rcu_read_unlock();
228 return error;
229 }
230
231 /* Initialize a sctp_addr from in incoming skb. */
sctp_v4_from_skb(union sctp_addr * addr,struct sk_buff * skb,int is_saddr)232 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
233 int is_saddr)
234 {
235 void *from;
236 __be16 *port;
237 struct sctphdr *sh;
238
239 port = &addr->v4.sin_port;
240 addr->v4.sin_family = AF_INET;
241
242 sh = sctp_hdr(skb);
243 if (is_saddr) {
244 *port = sh->source;
245 from = &ip_hdr(skb)->saddr;
246 } else {
247 *port = sh->dest;
248 from = &ip_hdr(skb)->daddr;
249 }
250 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
251 }
252
253 /* Initialize an sctp_addr from a socket. */
sctp_v4_from_sk(union sctp_addr * addr,struct sock * sk)254 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
255 {
256 addr->v4.sin_family = AF_INET;
257 addr->v4.sin_port = 0;
258 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
259 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
260 }
261
262 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
sctp_v4_to_sk_saddr(union sctp_addr * addr,struct sock * sk)263 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
264 {
265 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
266 }
267
268 /* Initialize sk->sk_daddr from sctp_addr. */
sctp_v4_to_sk_daddr(union sctp_addr * addr,struct sock * sk)269 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
270 {
271 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
272 }
273
274 /* Initialize a sctp_addr from an address parameter. */
sctp_v4_from_addr_param(union sctp_addr * addr,union sctp_addr_param * param,__be16 port,int iif)275 static bool sctp_v4_from_addr_param(union sctp_addr *addr,
276 union sctp_addr_param *param,
277 __be16 port, int iif)
278 {
279 if (ntohs(param->v4.param_hdr.length) < sizeof(struct sctp_ipv4addr_param))
280 return false;
281
282 addr->v4.sin_family = AF_INET;
283 addr->v4.sin_port = port;
284 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
285 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
286
287 return true;
288 }
289
290 /* Initialize an address parameter from a sctp_addr and return the length
291 * of the address parameter.
292 */
sctp_v4_to_addr_param(const union sctp_addr * addr,union sctp_addr_param * param)293 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
294 union sctp_addr_param *param)
295 {
296 int length = sizeof(sctp_ipv4addr_param_t);
297
298 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
299 param->v4.param_hdr.length = htons(length);
300 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
301
302 return length;
303 }
304
305 /* Initialize a sctp_addr from a dst_entry. */
sctp_v4_dst_saddr(union sctp_addr * saddr,struct flowi4 * fl4,__be16 port)306 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
307 __be16 port)
308 {
309 saddr->v4.sin_family = AF_INET;
310 saddr->v4.sin_port = port;
311 saddr->v4.sin_addr.s_addr = fl4->saddr;
312 memset(saddr->v4.sin_zero, 0, sizeof(saddr->v4.sin_zero));
313 }
314
315 /* Compare two addresses exactly. */
sctp_v4_cmp_addr(const union sctp_addr * addr1,const union sctp_addr * addr2)316 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
317 const union sctp_addr *addr2)
318 {
319 if (addr1->sa.sa_family != addr2->sa.sa_family)
320 return 0;
321 if (addr1->v4.sin_port != addr2->v4.sin_port)
322 return 0;
323 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
324 return 0;
325
326 return 1;
327 }
328
329 /* Initialize addr struct to INADDR_ANY. */
sctp_v4_inaddr_any(union sctp_addr * addr,__be16 port)330 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
331 {
332 addr->v4.sin_family = AF_INET;
333 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
334 addr->v4.sin_port = port;
335 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
336 }
337
338 /* Is this a wildcard address? */
sctp_v4_is_any(const union sctp_addr * addr)339 static int sctp_v4_is_any(const union sctp_addr *addr)
340 {
341 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
342 }
343
344 /* This function checks if the address is a valid address to be used for
345 * SCTP binding.
346 *
347 * Output:
348 * Return 0 - If the address is a non-unicast or an illegal address.
349 * Return 1 - If the address is a unicast.
350 */
sctp_v4_addr_valid(union sctp_addr * addr,struct sctp_sock * sp,const struct sk_buff * skb)351 static int sctp_v4_addr_valid(union sctp_addr *addr,
352 struct sctp_sock *sp,
353 const struct sk_buff *skb)
354 {
355 /* IPv4 addresses not allowed */
356 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
357 return 0;
358
359 /* Is this a non-unicast address or a unusable SCTP address? */
360 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
361 return 0;
362
363 /* Is this a broadcast address? */
364 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
365 return 0;
366
367 return 1;
368 }
369
370 /* Should this be available for binding? */
sctp_v4_available(union sctp_addr * addr,struct sctp_sock * sp)371 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
372 {
373 struct net *net = sock_net(&sp->inet.sk);
374 int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
375
376
377 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
378 ret != RTN_LOCAL &&
379 !sp->inet.freebind &&
380 !net->ipv4.sysctl_ip_nonlocal_bind)
381 return 0;
382
383 if (ipv6_only_sock(sctp_opt2sk(sp)))
384 return 0;
385
386 return 1;
387 }
388
389 /* Checking the loopback, private and other address scopes as defined in
390 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
391 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
392 *
393 * Level 0 - unusable SCTP addresses
394 * Level 1 - loopback address
395 * Level 2 - link-local addresses
396 * Level 3 - private addresses.
397 * Level 4 - global addresses
398 * For INIT and INIT-ACK address list, let L be the level of
399 * of requested destination address, sender and receiver
400 * SHOULD include all of its addresses with level greater
401 * than or equal to L.
402 *
403 * IPv4 scoping can be controlled through sysctl option
404 * net.sctp.addr_scope_policy
405 */
sctp_v4_scope(union sctp_addr * addr)406 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
407 {
408 sctp_scope_t retval;
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 ipv4_is_test_198(addr->v4.sin_addr.s_addr)) {
421 retval = SCTP_SCOPE_PRIVATE;
422 } else {
423 retval = SCTP_SCOPE_GLOBAL;
424 }
425
426 return retval;
427 }
428
429 /* Returns a valid dst cache entry for the given source and destination ip
430 * addresses. If an association is passed, trys to get a dst entry with a
431 * source address that matches an address in the bind address list.
432 */
sctp_v4_get_dst(struct sctp_transport * t,union sctp_addr * saddr,struct flowi * fl,struct sock * sk)433 static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
434 struct flowi *fl, struct sock *sk)
435 {
436 struct sctp_association *asoc = t->asoc;
437 struct rtable *rt;
438 struct flowi _fl;
439 struct flowi4 *fl4 = &_fl.u.ip4;
440 struct sctp_bind_addr *bp;
441 struct sctp_sockaddr_entry *laddr;
442 struct dst_entry *dst = NULL;
443 union sctp_addr *daddr = &t->ipaddr;
444 union sctp_addr dst_saddr;
445
446 memset(&_fl, 0x0, sizeof(_fl));
447 fl4->daddr = daddr->v4.sin_addr.s_addr;
448 fl4->fl4_dport = daddr->v4.sin_port;
449 fl4->flowi4_proto = IPPROTO_SCTP;
450 if (asoc) {
451 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
452 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
453 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
454 }
455 if (saddr) {
456 fl4->saddr = saddr->v4.sin_addr.s_addr;
457 fl4->fl4_sport = saddr->v4.sin_port;
458 }
459
460 pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
461 &fl4->saddr);
462
463 rt = ip_route_output_key(sock_net(sk), fl4);
464 if (!IS_ERR(rt)) {
465 dst = &rt->dst;
466 t->dst = dst;
467 memcpy(fl, &_fl, sizeof(_fl));
468 }
469
470 /* If there is no association or if a source address is passed, no
471 * more validation is required.
472 */
473 if (!asoc || saddr)
474 goto out;
475
476 bp = &asoc->base.bind_addr;
477
478 if (dst) {
479 /* Walk through the bind address list and look for a bind
480 * address that matches the source address of the returned dst.
481 */
482 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
483 rcu_read_lock();
484 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
485 if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
486 (laddr->state != SCTP_ADDR_SRC &&
487 !asoc->src_out_of_asoc_ok))
488 continue;
489 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
490 goto out_unlock;
491 }
492 rcu_read_unlock();
493
494 /* None of the bound addresses match the source address of the
495 * dst. So release it.
496 */
497 dst_release(dst);
498 dst = NULL;
499 }
500
501 /* Walk through the bind address list and try to get a dst that
502 * matches a bind address as the source address.
503 */
504 rcu_read_lock();
505 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
506 struct net_device *odev;
507
508 if (!laddr->valid)
509 continue;
510 if (laddr->state != SCTP_ADDR_SRC ||
511 AF_INET != laddr->a.sa.sa_family)
512 continue;
513
514 fl4->fl4_sport = laddr->a.v4.sin_port;
515 flowi4_update_output(fl4,
516 asoc->base.sk->sk_bound_dev_if,
517 RT_CONN_FLAGS(asoc->base.sk),
518 daddr->v4.sin_addr.s_addr,
519 laddr->a.v4.sin_addr.s_addr);
520
521 rt = ip_route_output_key(sock_net(sk), fl4);
522 if (IS_ERR(rt))
523 continue;
524
525 /* Ensure the src address belongs to the output
526 * interface.
527 */
528 odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr,
529 false);
530 if (!odev || odev->ifindex != fl4->flowi4_oif) {
531 if (!dst) {
532 dst = &rt->dst;
533 t->dst = dst;
534 memcpy(fl, &_fl, sizeof(_fl));
535 } else {
536 dst_release(&rt->dst);
537 }
538 continue;
539 }
540
541 dst_release(dst);
542 dst = &rt->dst;
543 t->dst = dst;
544 memcpy(fl, &_fl, sizeof(_fl));
545 break;
546 }
547
548 out_unlock:
549 rcu_read_unlock();
550 out:
551 if (dst) {
552 pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
553 &fl->u.ip4.daddr, &fl->u.ip4.saddr);
554 } else {
555 t->dst = NULL;
556 pr_debug("no route\n");
557 }
558 }
559
560 /* For v4, the source address is cached in the route entry(dst). So no need
561 * to cache it separately and hence this is an empty routine.
562 */
sctp_v4_get_saddr(struct sctp_sock * sk,struct sctp_transport * t,struct flowi * fl)563 static void sctp_v4_get_saddr(struct sctp_sock *sk,
564 struct sctp_transport *t,
565 struct flowi *fl)
566 {
567 union sctp_addr *saddr = &t->saddr;
568 struct rtable *rt = (struct rtable *)t->dst;
569
570 if (rt) {
571 saddr->v4.sin_family = AF_INET;
572 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
573 }
574 }
575
576 /* What interface did this skb arrive on? */
sctp_v4_skb_iif(const struct sk_buff * skb)577 static int sctp_v4_skb_iif(const struct sk_buff *skb)
578 {
579 return inet_iif(skb);
580 }
581
582 /* Was this packet marked by Explicit Congestion Notification? */
sctp_v4_is_ce(const struct sk_buff * skb)583 static int sctp_v4_is_ce(const struct sk_buff *skb)
584 {
585 return INET_ECN_is_ce(ip_hdr(skb)->tos);
586 }
587
588 /* Create and initialize a new sk for the socket returned by accept(). */
sctp_v4_create_accept_sk(struct sock * sk,struct sctp_association * asoc)589 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
590 struct sctp_association *asoc)
591 {
592 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
593 sk->sk_prot, 0);
594 struct inet_sock *newinet;
595
596 if (!newsk)
597 goto out;
598
599 sock_init_data(NULL, newsk);
600
601 sctp_copy_sock(newsk, sk, asoc);
602 sock_reset_flag(newsk, SOCK_ZAPPED);
603
604 newinet = inet_sk(newsk);
605
606 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
607
608 sk_refcnt_debug_inc(newsk);
609
610 if (newsk->sk_prot->init(newsk)) {
611 sk_common_release(newsk);
612 newsk = NULL;
613 }
614
615 out:
616 return newsk;
617 }
618
sctp_v4_addr_to_user(struct sctp_sock * sp,union sctp_addr * addr)619 static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
620 {
621 /* No address mapping for V4 sockets */
622 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
623 return sizeof(struct sockaddr_in);
624 }
625
626 /* Dump the v4 addr to the seq file. */
sctp_v4_seq_dump_addr(struct seq_file * seq,union sctp_addr * addr)627 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
628 {
629 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
630 }
631
sctp_v4_ecn_capable(struct sock * sk)632 static void sctp_v4_ecn_capable(struct sock *sk)
633 {
634 INET_ECN_xmit(sk);
635 }
636
sctp_addr_wq_timeout_handler(unsigned long arg)637 static void sctp_addr_wq_timeout_handler(unsigned long arg)
638 {
639 struct net *net = (struct net *)arg;
640 struct sctp_sockaddr_entry *addrw, *temp;
641 struct sctp_sock *sp;
642
643 spin_lock_bh(&net->sctp.addr_wq_lock);
644
645 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
646 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
647 "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
648 addrw->state, addrw);
649
650 #if IS_ENABLED(CONFIG_IPV6)
651 /* Now we send an ASCONF for each association */
652 /* Note. we currently don't handle link local IPv6 addressees */
653 if (addrw->a.sa.sa_family == AF_INET6) {
654 struct in6_addr *in6;
655
656 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
657 IPV6_ADDR_LINKLOCAL)
658 goto free_next;
659
660 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
661 if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
662 addrw->state == SCTP_ADDR_NEW) {
663 unsigned long timeo_val;
664
665 pr_debug("%s: this is on DAD, trying %d sec "
666 "later\n", __func__,
667 SCTP_ADDRESS_TICK_DELAY);
668
669 timeo_val = jiffies;
670 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
671 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
672 break;
673 }
674 }
675 #endif
676 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
677 struct sock *sk;
678
679 sk = sctp_opt2sk(sp);
680 /* ignore bound-specific endpoints */
681 if (!sctp_is_ep_boundall(sk))
682 continue;
683 bh_lock_sock(sk);
684 if (sctp_asconf_mgmt(sp, addrw) < 0)
685 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
686 bh_unlock_sock(sk);
687 }
688 #if IS_ENABLED(CONFIG_IPV6)
689 free_next:
690 #endif
691 list_del(&addrw->list);
692 kfree(addrw);
693 }
694 spin_unlock_bh(&net->sctp.addr_wq_lock);
695 }
696
sctp_free_addr_wq(struct net * net)697 static void sctp_free_addr_wq(struct net *net)
698 {
699 struct sctp_sockaddr_entry *addrw;
700 struct sctp_sockaddr_entry *temp;
701
702 spin_lock_bh(&net->sctp.addr_wq_lock);
703 del_timer(&net->sctp.addr_wq_timer);
704 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
705 list_del(&addrw->list);
706 kfree(addrw);
707 }
708 spin_unlock_bh(&net->sctp.addr_wq_lock);
709 }
710
711 /* lookup the entry for the same address in the addr_waitq
712 * sctp_addr_wq MUST be locked
713 */
sctp_addr_wq_lookup(struct net * net,struct sctp_sockaddr_entry * addr)714 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
715 struct sctp_sockaddr_entry *addr)
716 {
717 struct sctp_sockaddr_entry *addrw;
718
719 list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
720 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
721 continue;
722 if (addrw->a.sa.sa_family == AF_INET) {
723 if (addrw->a.v4.sin_addr.s_addr ==
724 addr->a.v4.sin_addr.s_addr)
725 return addrw;
726 } else if (addrw->a.sa.sa_family == AF_INET6) {
727 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
728 &addr->a.v6.sin6_addr))
729 return addrw;
730 }
731 }
732 return NULL;
733 }
734
sctp_addr_wq_mgmt(struct net * net,struct sctp_sockaddr_entry * addr,int cmd)735 void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
736 {
737 struct sctp_sockaddr_entry *addrw;
738 unsigned long timeo_val;
739
740 /* first, we check if an opposite message already exist in the queue.
741 * If we found such message, it is removed.
742 * This operation is a bit stupid, but the DHCP client attaches the
743 * new address after a couple of addition and deletion of that address
744 */
745
746 spin_lock_bh(&net->sctp.addr_wq_lock);
747 /* Offsets existing events in addr_wq */
748 addrw = sctp_addr_wq_lookup(net, addr);
749 if (addrw) {
750 if (addrw->state != cmd) {
751 pr_debug("%s: offsets existing entry for %d, addr:%pISc "
752 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
753 &net->sctp.addr_waitq);
754
755 list_del(&addrw->list);
756 kfree(addrw);
757 }
758 spin_unlock_bh(&net->sctp.addr_wq_lock);
759 return;
760 }
761
762 /* OK, we have to add the new address to the wait queue */
763 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
764 if (addrw == NULL) {
765 spin_unlock_bh(&net->sctp.addr_wq_lock);
766 return;
767 }
768 addrw->state = cmd;
769 list_add_tail(&addrw->list, &net->sctp.addr_waitq);
770
771 pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
772 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
773
774 if (!timer_pending(&net->sctp.addr_wq_timer)) {
775 timeo_val = jiffies;
776 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
777 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
778 }
779 spin_unlock_bh(&net->sctp.addr_wq_lock);
780 }
781
782 /* Event handler for inet address addition/deletion events.
783 * The sctp_local_addr_list needs to be protocted by a spin lock since
784 * multiple notifiers (say IPv4 and IPv6) may be running at the same
785 * time and thus corrupt the list.
786 * The reader side is protected with RCU.
787 */
sctp_inetaddr_event(struct notifier_block * this,unsigned long ev,void * ptr)788 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
789 void *ptr)
790 {
791 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
792 struct sctp_sockaddr_entry *addr = NULL;
793 struct sctp_sockaddr_entry *temp;
794 struct net *net = dev_net(ifa->ifa_dev->dev);
795 int found = 0;
796
797 switch (ev) {
798 case NETDEV_UP:
799 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
800 if (addr) {
801 addr->a.v4.sin_family = AF_INET;
802 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
803 addr->valid = 1;
804 spin_lock_bh(&net->sctp.local_addr_lock);
805 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
806 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
807 spin_unlock_bh(&net->sctp.local_addr_lock);
808 }
809 break;
810 case NETDEV_DOWN:
811 spin_lock_bh(&net->sctp.local_addr_lock);
812 list_for_each_entry_safe(addr, temp,
813 &net->sctp.local_addr_list, list) {
814 if (addr->a.sa.sa_family == AF_INET &&
815 addr->a.v4.sin_addr.s_addr ==
816 ifa->ifa_local) {
817 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
818 found = 1;
819 addr->valid = 0;
820 list_del_rcu(&addr->list);
821 break;
822 }
823 }
824 spin_unlock_bh(&net->sctp.local_addr_lock);
825 if (found)
826 kfree_rcu(addr, rcu);
827 break;
828 }
829
830 return NOTIFY_DONE;
831 }
832
833 /*
834 * Initialize the control inode/socket with a control endpoint data
835 * structure. This endpoint is reserved exclusively for the OOTB processing.
836 */
sctp_ctl_sock_init(struct net * net)837 static int sctp_ctl_sock_init(struct net *net)
838 {
839 int err;
840 sa_family_t family = PF_INET;
841
842 if (sctp_get_pf_specific(PF_INET6))
843 family = PF_INET6;
844
845 err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
846 SOCK_SEQPACKET, IPPROTO_SCTP, net);
847
848 /* If IPv6 socket could not be created, try the IPv4 socket */
849 if (err < 0 && family == PF_INET6)
850 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
851 SOCK_SEQPACKET, IPPROTO_SCTP,
852 net);
853
854 if (err < 0) {
855 pr_err("Failed to create the SCTP control socket\n");
856 return err;
857 }
858 return 0;
859 }
860
861 /* Register address family specific functions. */
sctp_register_af(struct sctp_af * af)862 int sctp_register_af(struct sctp_af *af)
863 {
864 switch (af->sa_family) {
865 case AF_INET:
866 if (sctp_af_v4_specific)
867 return 0;
868 sctp_af_v4_specific = af;
869 break;
870 case AF_INET6:
871 if (sctp_af_v6_specific)
872 return 0;
873 sctp_af_v6_specific = af;
874 break;
875 default:
876 return 0;
877 }
878
879 INIT_LIST_HEAD(&af->list);
880 list_add_tail(&af->list, &sctp_address_families);
881 return 1;
882 }
883
884 /* Get the table of functions for manipulating a particular address
885 * family.
886 */
sctp_get_af_specific(sa_family_t family)887 struct sctp_af *sctp_get_af_specific(sa_family_t family)
888 {
889 switch (family) {
890 case AF_INET:
891 return sctp_af_v4_specific;
892 case AF_INET6:
893 return sctp_af_v6_specific;
894 default:
895 return NULL;
896 }
897 }
898
899 /* Common code to initialize a AF_INET msg_name. */
sctp_inet_msgname(char * msgname,int * addr_len)900 static void sctp_inet_msgname(char *msgname, int *addr_len)
901 {
902 struct sockaddr_in *sin;
903
904 sin = (struct sockaddr_in *)msgname;
905 *addr_len = sizeof(struct sockaddr_in);
906 sin->sin_family = AF_INET;
907 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
908 }
909
910 /* Copy the primary address of the peer primary address as the msg_name. */
sctp_inet_event_msgname(struct sctp_ulpevent * event,char * msgname,int * addr_len)911 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
912 int *addr_len)
913 {
914 struct sockaddr_in *sin, *sinfrom;
915
916 if (msgname) {
917 struct sctp_association *asoc;
918
919 asoc = event->asoc;
920 sctp_inet_msgname(msgname, addr_len);
921 sin = (struct sockaddr_in *)msgname;
922 sinfrom = &asoc->peer.primary_addr.v4;
923 sin->sin_port = htons(asoc->peer.port);
924 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
925 }
926 }
927
928 /* Initialize and copy out a msgname from an inbound skb. */
sctp_inet_skb_msgname(struct sk_buff * skb,char * msgname,int * len)929 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
930 {
931 if (msgname) {
932 struct sctphdr *sh = sctp_hdr(skb);
933 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
934
935 sctp_inet_msgname(msgname, len);
936 sin->sin_port = sh->source;
937 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
938 }
939 }
940
941 /* Do we support this AF? */
sctp_inet_af_supported(sa_family_t family,struct sctp_sock * sp)942 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
943 {
944 /* PF_INET only supports AF_INET addresses. */
945 return AF_INET == family;
946 }
947
948 /* Address matching with wildcards allowed. */
sctp_inet_cmp_addr(const union sctp_addr * addr1,const union sctp_addr * addr2,struct sctp_sock * opt)949 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
950 const union sctp_addr *addr2,
951 struct sctp_sock *opt)
952 {
953 /* PF_INET only supports AF_INET addresses. */
954 if (addr1->sa.sa_family != addr2->sa.sa_family)
955 return 0;
956 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
957 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
958 return 1;
959 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
960 return 1;
961
962 return 0;
963 }
964
965 /* Verify that provided sockaddr looks bindable. Common verification has
966 * already been taken care of.
967 */
sctp_inet_bind_verify(struct sctp_sock * opt,union sctp_addr * addr)968 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
969 {
970 return sctp_v4_available(addr, opt);
971 }
972
973 /* Verify that sockaddr looks sendable. Common verification has already
974 * been taken care of.
975 */
sctp_inet_send_verify(struct sctp_sock * opt,union sctp_addr * addr)976 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
977 {
978 return 1;
979 }
980
981 /* Fill in Supported Address Type information for INIT and INIT-ACK
982 * chunks. Returns number of addresses supported.
983 */
sctp_inet_supported_addrs(const struct sctp_sock * opt,__be16 * types)984 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
985 __be16 *types)
986 {
987 types[0] = SCTP_PARAM_IPV4_ADDRESS;
988 return 1;
989 }
990
991 /* Wrapper routine that calls the ip transmit routine. */
sctp_v4_xmit(struct sk_buff * skb,struct sctp_transport * transport)992 static inline int sctp_v4_xmit(struct sk_buff *skb,
993 struct sctp_transport *transport)
994 {
995 struct inet_sock *inet = inet_sk(skb->sk);
996
997 pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
998 skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr);
999
1000 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
1001 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
1002
1003 SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
1004
1005 return ip_queue_xmit(&inet->sk, skb, &transport->fl);
1006 }
1007
1008 static struct sctp_af sctp_af_inet;
1009
1010 static struct sctp_pf sctp_pf_inet = {
1011 .event_msgname = sctp_inet_event_msgname,
1012 .skb_msgname = sctp_inet_skb_msgname,
1013 .af_supported = sctp_inet_af_supported,
1014 .cmp_addr = sctp_inet_cmp_addr,
1015 .bind_verify = sctp_inet_bind_verify,
1016 .send_verify = sctp_inet_send_verify,
1017 .supported_addrs = sctp_inet_supported_addrs,
1018 .create_accept_sk = sctp_v4_create_accept_sk,
1019 .addr_to_user = sctp_v4_addr_to_user,
1020 .to_sk_saddr = sctp_v4_to_sk_saddr,
1021 .to_sk_daddr = sctp_v4_to_sk_daddr,
1022 .af = &sctp_af_inet
1023 };
1024
1025 /* Notifier for inetaddr addition/deletion events. */
1026 static struct notifier_block sctp_inetaddr_notifier = {
1027 .notifier_call = sctp_inetaddr_event,
1028 };
1029
1030 /* Socket operations. */
1031 static const struct proto_ops inet_seqpacket_ops = {
1032 .family = PF_INET,
1033 .owner = THIS_MODULE,
1034 .release = inet_release, /* Needs to be wrapped... */
1035 .bind = inet_bind,
1036 .connect = sctp_inet_connect,
1037 .socketpair = sock_no_socketpair,
1038 .accept = inet_accept,
1039 .getname = inet_getname, /* Semantics are different. */
1040 .poll = sctp_poll,
1041 .ioctl = inet_ioctl,
1042 .listen = sctp_inet_listen,
1043 .shutdown = inet_shutdown, /* Looks harmless. */
1044 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1045 .getsockopt = sock_common_getsockopt,
1046 .sendmsg = inet_sendmsg,
1047 .recvmsg = sock_common_recvmsg,
1048 .mmap = sock_no_mmap,
1049 .sendpage = sock_no_sendpage,
1050 #ifdef CONFIG_COMPAT
1051 .compat_setsockopt = compat_sock_common_setsockopt,
1052 .compat_getsockopt = compat_sock_common_getsockopt,
1053 #endif
1054 };
1055
1056 /* Registration with AF_INET family. */
1057 static struct inet_protosw sctp_seqpacket_protosw = {
1058 .type = SOCK_SEQPACKET,
1059 .protocol = IPPROTO_SCTP,
1060 .prot = &sctp_prot,
1061 .ops = &inet_seqpacket_ops,
1062 .flags = SCTP_PROTOSW_FLAG
1063 };
1064 static struct inet_protosw sctp_stream_protosw = {
1065 .type = SOCK_STREAM,
1066 .protocol = IPPROTO_SCTP,
1067 .prot = &sctp_prot,
1068 .ops = &inet_seqpacket_ops,
1069 .flags = SCTP_PROTOSW_FLAG
1070 };
1071
1072 /* Register with IP layer. */
1073 static const struct net_protocol sctp_protocol = {
1074 .handler = sctp_rcv,
1075 .err_handler = sctp_v4_err,
1076 .no_policy = 1,
1077 .netns_ok = 1,
1078 .icmp_strict_tag_validation = 1,
1079 };
1080
1081 /* IPv4 address related functions. */
1082 static struct sctp_af sctp_af_inet = {
1083 .sa_family = AF_INET,
1084 .sctp_xmit = sctp_v4_xmit,
1085 .setsockopt = ip_setsockopt,
1086 .getsockopt = ip_getsockopt,
1087 .get_dst = sctp_v4_get_dst,
1088 .get_saddr = sctp_v4_get_saddr,
1089 .copy_addrlist = sctp_v4_copy_addrlist,
1090 .from_skb = sctp_v4_from_skb,
1091 .from_sk = sctp_v4_from_sk,
1092 .from_addr_param = sctp_v4_from_addr_param,
1093 .to_addr_param = sctp_v4_to_addr_param,
1094 .cmp_addr = sctp_v4_cmp_addr,
1095 .addr_valid = sctp_v4_addr_valid,
1096 .inaddr_any = sctp_v4_inaddr_any,
1097 .is_any = sctp_v4_is_any,
1098 .available = sctp_v4_available,
1099 .scope = sctp_v4_scope,
1100 .skb_iif = sctp_v4_skb_iif,
1101 .is_ce = sctp_v4_is_ce,
1102 .seq_dump_addr = sctp_v4_seq_dump_addr,
1103 .ecn_capable = sctp_v4_ecn_capable,
1104 .net_header_len = sizeof(struct iphdr),
1105 .sockaddr_len = sizeof(struct sockaddr_in),
1106 #ifdef CONFIG_COMPAT
1107 .compat_setsockopt = compat_ip_setsockopt,
1108 .compat_getsockopt = compat_ip_getsockopt,
1109 #endif
1110 };
1111
sctp_get_pf_specific(sa_family_t family)1112 struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
1113 {
1114 switch (family) {
1115 case PF_INET:
1116 return sctp_pf_inet_specific;
1117 case PF_INET6:
1118 return sctp_pf_inet6_specific;
1119 default:
1120 return NULL;
1121 }
1122 }
1123
1124 /* Register the PF specific function table. */
sctp_register_pf(struct sctp_pf * pf,sa_family_t family)1125 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1126 {
1127 switch (family) {
1128 case PF_INET:
1129 if (sctp_pf_inet_specific)
1130 return 0;
1131 sctp_pf_inet_specific = pf;
1132 break;
1133 case PF_INET6:
1134 if (sctp_pf_inet6_specific)
1135 return 0;
1136 sctp_pf_inet6_specific = pf;
1137 break;
1138 default:
1139 return 0;
1140 }
1141 return 1;
1142 }
1143
init_sctp_mibs(struct net * net)1144 static inline int init_sctp_mibs(struct net *net)
1145 {
1146 net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib);
1147 if (!net->sctp.sctp_statistics)
1148 return -ENOMEM;
1149 return 0;
1150 }
1151
cleanup_sctp_mibs(struct net * net)1152 static inline void cleanup_sctp_mibs(struct net *net)
1153 {
1154 free_percpu(net->sctp.sctp_statistics);
1155 }
1156
sctp_v4_pf_init(void)1157 static void sctp_v4_pf_init(void)
1158 {
1159 /* Initialize the SCTP specific PF functions. */
1160 sctp_register_pf(&sctp_pf_inet, PF_INET);
1161 sctp_register_af(&sctp_af_inet);
1162 }
1163
sctp_v4_pf_exit(void)1164 static void sctp_v4_pf_exit(void)
1165 {
1166 list_del(&sctp_af_inet.list);
1167 }
1168
sctp_v4_protosw_init(void)1169 static int sctp_v4_protosw_init(void)
1170 {
1171 int rc;
1172
1173 rc = proto_register(&sctp_prot, 1);
1174 if (rc)
1175 return rc;
1176
1177 /* Register SCTP(UDP and TCP style) with socket layer. */
1178 inet_register_protosw(&sctp_seqpacket_protosw);
1179 inet_register_protosw(&sctp_stream_protosw);
1180
1181 return 0;
1182 }
1183
sctp_v4_protosw_exit(void)1184 static void sctp_v4_protosw_exit(void)
1185 {
1186 inet_unregister_protosw(&sctp_stream_protosw);
1187 inet_unregister_protosw(&sctp_seqpacket_protosw);
1188 proto_unregister(&sctp_prot);
1189 }
1190
sctp_v4_add_protocol(void)1191 static int sctp_v4_add_protocol(void)
1192 {
1193 /* Register notifier for inet address additions/deletions. */
1194 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1195
1196 /* Register SCTP with inet layer. */
1197 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1198 return -EAGAIN;
1199
1200 return 0;
1201 }
1202
sctp_v4_del_protocol(void)1203 static void sctp_v4_del_protocol(void)
1204 {
1205 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1206 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1207 }
1208
sctp_defaults_init(struct net * net)1209 static int __net_init sctp_defaults_init(struct net *net)
1210 {
1211 int status;
1212
1213 /*
1214 * 14. Suggested SCTP Protocol Parameter Values
1215 */
1216 /* The following protocol parameters are RECOMMENDED: */
1217 /* RTO.Initial - 3 seconds */
1218 net->sctp.rto_initial = SCTP_RTO_INITIAL;
1219 /* RTO.Min - 1 second */
1220 net->sctp.rto_min = SCTP_RTO_MIN;
1221 /* RTO.Max - 60 seconds */
1222 net->sctp.rto_max = SCTP_RTO_MAX;
1223 /* RTO.Alpha - 1/8 */
1224 net->sctp.rto_alpha = SCTP_RTO_ALPHA;
1225 /* RTO.Beta - 1/4 */
1226 net->sctp.rto_beta = SCTP_RTO_BETA;
1227
1228 /* Valid.Cookie.Life - 60 seconds */
1229 net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
1230
1231 /* Whether Cookie Preservative is enabled(1) or not(0) */
1232 net->sctp.cookie_preserve_enable = 1;
1233
1234 /* Default sctp sockets to use md5 as their hmac alg */
1235 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1236 net->sctp.sctp_hmac_alg = "md5";
1237 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1238 net->sctp.sctp_hmac_alg = "sha1";
1239 #else
1240 net->sctp.sctp_hmac_alg = NULL;
1241 #endif
1242
1243 /* Max.Burst - 4 */
1244 net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST;
1245
1246 /* Association.Max.Retrans - 10 attempts
1247 * Path.Max.Retrans - 5 attempts (per destination address)
1248 * Max.Init.Retransmits - 8 attempts
1249 */
1250 net->sctp.max_retrans_association = 10;
1251 net->sctp.max_retrans_path = 5;
1252 net->sctp.max_retrans_init = 8;
1253
1254 /* Sendbuffer growth - do per-socket accounting */
1255 net->sctp.sndbuf_policy = 0;
1256
1257 /* Rcvbuffer growth - do per-socket accounting */
1258 net->sctp.rcvbuf_policy = 0;
1259
1260 /* HB.interval - 30 seconds */
1261 net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1262
1263 /* delayed SACK timeout */
1264 net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
1265
1266 /* Disable ADDIP by default. */
1267 net->sctp.addip_enable = 0;
1268 net->sctp.addip_noauth = 0;
1269 net->sctp.default_auto_asconf = 0;
1270
1271 /* Enable PR-SCTP by default. */
1272 net->sctp.prsctp_enable = 1;
1273
1274 /* Disable AUTH by default. */
1275 net->sctp.auth_enable = 0;
1276
1277 /* Set SCOPE policy to enabled */
1278 net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1279
1280 /* Set the default rwnd update threshold */
1281 net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1282
1283 /* Initialize maximum autoclose timeout. */
1284 net->sctp.max_autoclose = INT_MAX / HZ;
1285
1286 status = sctp_sysctl_net_register(net);
1287 if (status)
1288 goto err_sysctl_register;
1289
1290 /* Allocate and initialise sctp mibs. */
1291 status = init_sctp_mibs(net);
1292 if (status)
1293 goto err_init_mibs;
1294
1295 /* Initialize proc fs directory. */
1296 status = sctp_proc_init(net);
1297 if (status)
1298 goto err_init_proc;
1299
1300 sctp_dbg_objcnt_init(net);
1301
1302 /* Initialize the local address list. */
1303 INIT_LIST_HEAD(&net->sctp.local_addr_list);
1304 spin_lock_init(&net->sctp.local_addr_lock);
1305 sctp_get_local_addr_list(net);
1306
1307 /* Initialize the address event list */
1308 INIT_LIST_HEAD(&net->sctp.addr_waitq);
1309 INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1310 spin_lock_init(&net->sctp.addr_wq_lock);
1311 net->sctp.addr_wq_timer.expires = 0;
1312 setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler,
1313 (unsigned long)net);
1314
1315 return 0;
1316
1317 err_init_proc:
1318 cleanup_sctp_mibs(net);
1319 err_init_mibs:
1320 sctp_sysctl_net_unregister(net);
1321 err_sysctl_register:
1322 return status;
1323 }
1324
sctp_defaults_exit(struct net * net)1325 static void __net_exit sctp_defaults_exit(struct net *net)
1326 {
1327 /* Free the local address list */
1328 sctp_free_addr_wq(net);
1329 sctp_free_local_addr_list(net);
1330
1331 sctp_dbg_objcnt_exit(net);
1332
1333 sctp_proc_exit(net);
1334 cleanup_sctp_mibs(net);
1335 sctp_sysctl_net_unregister(net);
1336 }
1337
1338 static struct pernet_operations sctp_defaults_ops = {
1339 .init = sctp_defaults_init,
1340 .exit = sctp_defaults_exit,
1341 };
1342
sctp_ctrlsock_init(struct net * net)1343 static int __net_init sctp_ctrlsock_init(struct net *net)
1344 {
1345 int status;
1346
1347 /* Initialize the control inode/socket for handling OOTB packets. */
1348 status = sctp_ctl_sock_init(net);
1349 if (status)
1350 pr_err("Failed to initialize the SCTP control sock\n");
1351
1352 return status;
1353 }
1354
sctp_ctrlsock_exit(struct net * net)1355 static void __net_exit sctp_ctrlsock_exit(struct net *net)
1356 {
1357 /* Free the control endpoint. */
1358 inet_ctl_sock_destroy(net->sctp.ctl_sock);
1359 }
1360
1361 static struct pernet_operations sctp_ctrlsock_ops = {
1362 .init = sctp_ctrlsock_init,
1363 .exit = sctp_ctrlsock_exit,
1364 };
1365
1366 /* Initialize the universe into something sensible. */
sctp_init(void)1367 static __init int sctp_init(void)
1368 {
1369 int i;
1370 int status = -EINVAL;
1371 unsigned long goal;
1372 unsigned long limit;
1373 int max_share;
1374 int order;
1375 int num_entries;
1376 int max_entry_order;
1377
1378 sock_skb_cb_check_size(sizeof(struct sctp_ulpevent));
1379
1380 /* Allocate bind_bucket and chunk caches. */
1381 status = -ENOBUFS;
1382 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1383 sizeof(struct sctp_bind_bucket),
1384 0, SLAB_HWCACHE_ALIGN,
1385 NULL);
1386 if (!sctp_bucket_cachep)
1387 goto out;
1388
1389 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1390 sizeof(struct sctp_chunk),
1391 0, SLAB_HWCACHE_ALIGN,
1392 NULL);
1393 if (!sctp_chunk_cachep)
1394 goto err_chunk_cachep;
1395
1396 status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL);
1397 if (status)
1398 goto err_percpu_counter_init;
1399
1400 /* Implementation specific variables. */
1401
1402 /* Initialize default stream count setup information. */
1403 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1404 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1405
1406 /* Initialize handle used for association ids. */
1407 idr_init(&sctp_assocs_id);
1408
1409 limit = nr_free_buffer_pages() / 8;
1410 limit = max(limit, 128UL);
1411 sysctl_sctp_mem[0] = limit / 4 * 3;
1412 sysctl_sctp_mem[1] = limit;
1413 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1414
1415 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1416 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1417 max_share = min(4UL*1024*1024, limit);
1418
1419 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1420 sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1421 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1422
1423 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1424 sysctl_sctp_wmem[1] = 16*1024;
1425 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1426
1427 /* Size and allocate the association hash table.
1428 * The methodology is similar to that of the tcp hash tables.
1429 * Though not identical. Start by getting a goal size
1430 */
1431 if (totalram_pages >= (128 * 1024))
1432 goal = totalram_pages >> (22 - PAGE_SHIFT);
1433 else
1434 goal = totalram_pages >> (24 - PAGE_SHIFT);
1435
1436 /* Then compute the page order for said goal */
1437 order = get_order(goal);
1438
1439 /* Now compute the required page order for the maximum sized table we
1440 * want to create
1441 */
1442 max_entry_order = get_order(MAX_SCTP_PORT_HASH_ENTRIES *
1443 sizeof(struct sctp_bind_hashbucket));
1444
1445 /* Limit the page order by that maximum hash table size */
1446 order = min(order, max_entry_order);
1447
1448 do {
1449 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1450 sizeof(struct sctp_hashbucket);
1451 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1452 continue;
1453 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1454 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1455 } while (!sctp_assoc_hashtable && --order > 0);
1456 if (!sctp_assoc_hashtable) {
1457 pr_err("Failed association hash alloc\n");
1458 status = -ENOMEM;
1459 goto err_ahash_alloc;
1460 }
1461 for (i = 0; i < sctp_assoc_hashsize; i++) {
1462 rwlock_init(&sctp_assoc_hashtable[i].lock);
1463 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
1464 }
1465
1466 /* Allocate and initialize the endpoint hash table. */
1467 sctp_ep_hashsize = 64;
1468 sctp_ep_hashtable =
1469 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1470 if (!sctp_ep_hashtable) {
1471 pr_err("Failed endpoint_hash alloc\n");
1472 status = -ENOMEM;
1473 goto err_ehash_alloc;
1474 }
1475 for (i = 0; i < sctp_ep_hashsize; i++) {
1476 rwlock_init(&sctp_ep_hashtable[i].lock);
1477 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1478 }
1479
1480 /* Allocate and initialize the SCTP port hash table.
1481 * Note that order is initalized to start at the max sized
1482 * table we want to support. If we can't get that many pages
1483 * reduce the order and try again
1484 */
1485 do {
1486 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1487 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1488 } while (!sctp_port_hashtable && --order > 0);
1489
1490 if (!sctp_port_hashtable) {
1491 pr_err("Failed bind hash alloc\n");
1492 status = -ENOMEM;
1493 goto err_bhash_alloc;
1494 }
1495
1496 /* Now compute the number of entries that will fit in the
1497 * port hash space we allocated
1498 */
1499 num_entries = (1UL << order) * PAGE_SIZE /
1500 sizeof(struct sctp_bind_hashbucket);
1501
1502 /* And finish by rounding it down to the nearest power of two
1503 * this wastes some memory of course, but its needed because
1504 * the hash function operates based on the assumption that
1505 * that the number of entries is a power of two
1506 */
1507 sctp_port_hashsize = rounddown_pow_of_two(num_entries);
1508
1509 for (i = 0; i < sctp_port_hashsize; i++) {
1510 spin_lock_init(&sctp_port_hashtable[i].lock);
1511 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1512 }
1513
1514 pr_info("Hash tables configured (established %d bind %d)\n",
1515 sctp_assoc_hashsize, sctp_port_hashsize);
1516
1517 sctp_sysctl_register();
1518
1519 INIT_LIST_HEAD(&sctp_address_families);
1520 sctp_v4_pf_init();
1521 sctp_v6_pf_init();
1522
1523 status = register_pernet_subsys(&sctp_defaults_ops);
1524 if (status)
1525 goto err_register_defaults;
1526
1527 status = sctp_v4_protosw_init();
1528 if (status)
1529 goto err_protosw_init;
1530
1531 status = sctp_v6_protosw_init();
1532 if (status)
1533 goto err_v6_protosw_init;
1534
1535 status = register_pernet_subsys(&sctp_ctrlsock_ops);
1536 if (status)
1537 goto err_register_ctrlsock;
1538
1539 status = sctp_v4_add_protocol();
1540 if (status)
1541 goto err_add_protocol;
1542
1543 /* Register SCTP with inet6 layer. */
1544 status = sctp_v6_add_protocol();
1545 if (status)
1546 goto err_v6_add_protocol;
1547
1548 out:
1549 return status;
1550 err_v6_add_protocol:
1551 sctp_v4_del_protocol();
1552 err_add_protocol:
1553 unregister_pernet_subsys(&sctp_ctrlsock_ops);
1554 err_register_ctrlsock:
1555 sctp_v6_protosw_exit();
1556 err_v6_protosw_init:
1557 sctp_v4_protosw_exit();
1558 err_protosw_init:
1559 unregister_pernet_subsys(&sctp_defaults_ops);
1560 err_register_defaults:
1561 sctp_v4_pf_exit();
1562 sctp_v6_pf_exit();
1563 sctp_sysctl_unregister();
1564 free_pages((unsigned long)sctp_port_hashtable,
1565 get_order(sctp_port_hashsize *
1566 sizeof(struct sctp_bind_hashbucket)));
1567 err_bhash_alloc:
1568 kfree(sctp_ep_hashtable);
1569 err_ehash_alloc:
1570 free_pages((unsigned long)sctp_assoc_hashtable,
1571 get_order(sctp_assoc_hashsize *
1572 sizeof(struct sctp_hashbucket)));
1573 err_ahash_alloc:
1574 percpu_counter_destroy(&sctp_sockets_allocated);
1575 err_percpu_counter_init:
1576 kmem_cache_destroy(sctp_chunk_cachep);
1577 err_chunk_cachep:
1578 kmem_cache_destroy(sctp_bucket_cachep);
1579 goto out;
1580 }
1581
1582 /* Exit handler for the SCTP protocol. */
sctp_exit(void)1583 static __exit void sctp_exit(void)
1584 {
1585 /* BUG. This should probably do something useful like clean
1586 * up all the remaining associations and all that memory.
1587 */
1588
1589 /* Unregister with inet6/inet layers. */
1590 sctp_v6_del_protocol();
1591 sctp_v4_del_protocol();
1592
1593 unregister_pernet_subsys(&sctp_ctrlsock_ops);
1594
1595 /* Free protosw registrations */
1596 sctp_v6_protosw_exit();
1597 sctp_v4_protosw_exit();
1598
1599 unregister_pernet_subsys(&sctp_defaults_ops);
1600
1601 /* Unregister with socket layer. */
1602 sctp_v6_pf_exit();
1603 sctp_v4_pf_exit();
1604
1605 sctp_sysctl_unregister();
1606
1607 free_pages((unsigned long)sctp_assoc_hashtable,
1608 get_order(sctp_assoc_hashsize *
1609 sizeof(struct sctp_hashbucket)));
1610 kfree(sctp_ep_hashtable);
1611 free_pages((unsigned long)sctp_port_hashtable,
1612 get_order(sctp_port_hashsize *
1613 sizeof(struct sctp_bind_hashbucket)));
1614
1615 percpu_counter_destroy(&sctp_sockets_allocated);
1616
1617 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1618
1619 kmem_cache_destroy(sctp_chunk_cachep);
1620 kmem_cache_destroy(sctp_bucket_cachep);
1621 }
1622
1623 module_init(sctp_init);
1624 module_exit(sctp_exit);
1625
1626 /*
1627 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1628 */
1629 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1630 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1631 MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
1632 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1633 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1634 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1635 MODULE_LICENSE("GPL");
1636