Merge tag 'v3.12-rc2' into patchwork
[linux-drm-fsl-dcu.git] / net / sctp / protocol.c
1 /* SCTP kernel implementation
2  * (C) Copyright IBM Corp. 2001, 2004
3  * Copyright (c) 1999-2000 Cisco, Inc.
4  * Copyright (c) 1999-2001 Motorola, Inc.
5  * Copyright (c) 2001 Intel Corp.
6  * Copyright (c) 2001 Nokia, Inc.
7  * Copyright (c) 2001 La Monte H.P. Yarroll
8  *
9  * This file is part of the SCTP kernel implementation
10  *
11  * Initialization/cleanup for SCTP protocol support.
12  *
13  * This SCTP implementation is free software;
14  * you can redistribute it and/or modify it under the terms of
15  * the GNU General Public License as published by
16  * the Free Software Foundation; either version 2, or (at your option)
17  * any later version.
18  *
19  * This SCTP implementation is distributed in the hope that it
20  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21  *                 ************************
22  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23  * See the GNU General Public License for more details.
24  *
25  * You should have received a copy of the GNU General Public License
26  * along with GNU CC; see the file COPYING.  If not, write to
27  * the Free Software Foundation, 59 Temple Place - Suite 330,
28  * Boston, MA 02111-1307, USA.
29  *
30  * Please send any bug reports or fixes you make to the
31  * email address(es):
32  *    lksctp developers <linux-sctp@vger.kernel.org>
33  *
34  * Written or modified by:
35  *    La Monte H.P. Yarroll <piggy@acm.org>
36  *    Karl Knutson <karl@athena.chicago.il.us>
37  *    Jon Grimm <jgrimm@us.ibm.com>
38  *    Sridhar Samudrala <sri@us.ibm.com>
39  *    Daisy Chang <daisyc@us.ibm.com>
40  *    Ardelle Fan <ardelle.fan@intel.com>
41  */
42
43 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
44
45 #include <linux/module.h>
46 #include <linux/init.h>
47 #include <linux/netdevice.h>
48 #include <linux/inetdevice.h>
49 #include <linux/seq_file.h>
50 #include <linux/bootmem.h>
51 #include <linux/highmem.h>
52 #include <linux/swap.h>
53 #include <linux/slab.h>
54 #include <net/net_namespace.h>
55 #include <net/protocol.h>
56 #include <net/ip.h>
57 #include <net/ipv6.h>
58 #include <net/route.h>
59 #include <net/sctp/sctp.h>
60 #include <net/addrconf.h>
61 #include <net/inet_common.h>
62 #include <net/inet_ecn.h>
63
64 /* Global data structures. */
65 struct sctp_globals sctp_globals __read_mostly;
66
67 struct idr sctp_assocs_id;
68 DEFINE_SPINLOCK(sctp_assocs_id_lock);
69
70 static struct sctp_pf *sctp_pf_inet6_specific;
71 static struct sctp_pf *sctp_pf_inet_specific;
72 static struct sctp_af *sctp_af_v4_specific;
73 static struct sctp_af *sctp_af_v6_specific;
74
75 struct kmem_cache *sctp_chunk_cachep __read_mostly;
76 struct kmem_cache *sctp_bucket_cachep __read_mostly;
77
78 long sysctl_sctp_mem[3];
79 int sysctl_sctp_rmem[3];
80 int sysctl_sctp_wmem[3];
81
82 /* Set up the proc fs entry for the SCTP protocol. */
83 static int __net_init sctp_proc_init(struct net *net)
84 {
85 #ifdef CONFIG_PROC_FS
86         net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net);
87         if (!net->sctp.proc_net_sctp)
88                 goto out_proc_net_sctp;
89         if (sctp_snmp_proc_init(net))
90                 goto out_snmp_proc_init;
91         if (sctp_eps_proc_init(net))
92                 goto out_eps_proc_init;
93         if (sctp_assocs_proc_init(net))
94                 goto out_assocs_proc_init;
95         if (sctp_remaddr_proc_init(net))
96                 goto out_remaddr_proc_init;
97
98         return 0;
99
100 out_remaddr_proc_init:
101         sctp_assocs_proc_exit(net);
102 out_assocs_proc_init:
103         sctp_eps_proc_exit(net);
104 out_eps_proc_init:
105         sctp_snmp_proc_exit(net);
106 out_snmp_proc_init:
107         remove_proc_entry("sctp", net->proc_net);
108         net->sctp.proc_net_sctp = NULL;
109 out_proc_net_sctp:
110         return -ENOMEM;
111 #endif /* CONFIG_PROC_FS */
112         return 0;
113 }
114
115 /* Clean up the proc fs entry for the SCTP protocol.
116  * Note: Do not make this __exit as it is used in the init error
117  * path.
118  */
119 static void sctp_proc_exit(struct net *net)
120 {
121 #ifdef CONFIG_PROC_FS
122         sctp_snmp_proc_exit(net);
123         sctp_eps_proc_exit(net);
124         sctp_assocs_proc_exit(net);
125         sctp_remaddr_proc_exit(net);
126
127         remove_proc_entry("sctp", net->proc_net);
128         net->sctp.proc_net_sctp = NULL;
129 #endif
130 }
131
132 /* Private helper to extract ipv4 address and stash them in
133  * the protocol structure.
134  */
135 static void sctp_v4_copy_addrlist(struct list_head *addrlist,
136                                   struct net_device *dev)
137 {
138         struct in_device *in_dev;
139         struct in_ifaddr *ifa;
140         struct sctp_sockaddr_entry *addr;
141
142         rcu_read_lock();
143         if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
144                 rcu_read_unlock();
145                 return;
146         }
147
148         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
149                 /* Add the address to the local list.  */
150                 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
151                 if (addr) {
152                         addr->a.v4.sin_family = AF_INET;
153                         addr->a.v4.sin_port = 0;
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  */
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.  */
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'.  */
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_PEERSUPP))) ||
214                             (((AF_INET6 == addr->a.sa.sa_family) &&
215                               (copy_flags & SCTP_ADDR6_ALLOWED) &&
216                               (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
217                                 error = sctp_add_bind_addr(bp, &addr->a,
218                                                     SCTP_ADDR_SRC, GFP_ATOMIC);
219                                 if (error)
220                                         goto end_copy;
221                         }
222                 }
223         }
224
225 end_copy:
226         rcu_read_unlock();
227         return error;
228 }
229
230 /* Initialize a sctp_addr from in incoming skb.  */
231 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
232                              int is_saddr)
233 {
234         void *from;
235         __be16 *port;
236         struct sctphdr *sh;
237
238         port = &addr->v4.sin_port;
239         addr->v4.sin_family = AF_INET;
240
241         sh = sctp_hdr(skb);
242         if (is_saddr) {
243                 *port  = sh->source;
244                 from = &ip_hdr(skb)->saddr;
245         } else {
246                 *port = sh->dest;
247                 from = &ip_hdr(skb)->daddr;
248         }
249         memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
250 }
251
252 /* Initialize an sctp_addr from a socket. */
253 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
254 {
255         addr->v4.sin_family = AF_INET;
256         addr->v4.sin_port = 0;
257         addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
258 }
259
260 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
261 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
262 {
263         inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
264 }
265
266 /* Initialize sk->sk_daddr from sctp_addr. */
267 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
268 {
269         inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
270 }
271
272 /* Initialize a sctp_addr from an address parameter. */
273 static void sctp_v4_from_addr_param(union sctp_addr *addr,
274                                     union sctp_addr_param *param,
275                                     __be16 port, int iif)
276 {
277         addr->v4.sin_family = AF_INET;
278         addr->v4.sin_port = port;
279         addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
280 }
281
282 /* Initialize an address parameter from a sctp_addr and return the length
283  * of the address parameter.
284  */
285 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
286                                  union sctp_addr_param *param)
287 {
288         int length = sizeof(sctp_ipv4addr_param_t);
289
290         param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
291         param->v4.param_hdr.length = htons(length);
292         param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
293
294         return length;
295 }
296
297 /* Initialize a sctp_addr from a dst_entry. */
298 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
299                               __be16 port)
300 {
301         saddr->v4.sin_family = AF_INET;
302         saddr->v4.sin_port = port;
303         saddr->v4.sin_addr.s_addr = fl4->saddr;
304 }
305
306 /* Compare two addresses exactly. */
307 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
308                             const union sctp_addr *addr2)
309 {
310         if (addr1->sa.sa_family != addr2->sa.sa_family)
311                 return 0;
312         if (addr1->v4.sin_port != addr2->v4.sin_port)
313                 return 0;
314         if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
315                 return 0;
316
317         return 1;
318 }
319
320 /* Initialize addr struct to INADDR_ANY. */
321 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
322 {
323         addr->v4.sin_family = AF_INET;
324         addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
325         addr->v4.sin_port = port;
326 }
327
328 /* Is this a wildcard address? */
329 static int sctp_v4_is_any(const union sctp_addr *addr)
330 {
331         return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
332 }
333
334 /* This function checks if the address is a valid address to be used for
335  * SCTP binding.
336  *
337  * Output:
338  * Return 0 - If the address is a non-unicast or an illegal address.
339  * Return 1 - If the address is a unicast.
340  */
341 static int sctp_v4_addr_valid(union sctp_addr *addr,
342                               struct sctp_sock *sp,
343                               const struct sk_buff *skb)
344 {
345         /* IPv4 addresses not allowed */
346         if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
347                 return 0;
348
349         /* Is this a non-unicast address or a unusable SCTP address? */
350         if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
351                 return 0;
352
353         /* Is this a broadcast address? */
354         if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
355                 return 0;
356
357         return 1;
358 }
359
360 /* Should this be available for binding?   */
361 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
362 {
363         struct net *net = sock_net(&sp->inet.sk);
364         int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
365
366
367         if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
368            ret != RTN_LOCAL &&
369            !sp->inet.freebind &&
370            !sysctl_ip_nonlocal_bind)
371                 return 0;
372
373         if (ipv6_only_sock(sctp_opt2sk(sp)))
374                 return 0;
375
376         return 1;
377 }
378
379 /* Checking the loopback, private and other address scopes as defined in
380  * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
381  * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
382  *
383  * Level 0 - unusable SCTP addresses
384  * Level 1 - loopback address
385  * Level 2 - link-local addresses
386  * Level 3 - private addresses.
387  * Level 4 - global addresses
388  * For INIT and INIT-ACK address list, let L be the level of
389  * of requested destination address, sender and receiver
390  * SHOULD include all of its addresses with level greater
391  * than or equal to L.
392  *
393  * IPv4 scoping can be controlled through sysctl option
394  * net.sctp.addr_scope_policy
395  */
396 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
397 {
398         sctp_scope_t retval;
399
400         /* Check for unusable SCTP addresses. */
401         if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
402                 retval =  SCTP_SCOPE_UNUSABLE;
403         } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
404                 retval = SCTP_SCOPE_LOOPBACK;
405         } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
406                 retval = SCTP_SCOPE_LINK;
407         } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
408                    ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
409                    ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
410                 retval = SCTP_SCOPE_PRIVATE;
411         } else {
412                 retval = SCTP_SCOPE_GLOBAL;
413         }
414
415         return retval;
416 }
417
418 /* Returns a valid dst cache entry for the given source and destination ip
419  * addresses. If an association is passed, trys to get a dst entry with a
420  * source address that matches an address in the bind address list.
421  */
422 static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
423                                 struct flowi *fl, struct sock *sk)
424 {
425         struct sctp_association *asoc = t->asoc;
426         struct rtable *rt;
427         struct flowi4 *fl4 = &fl->u.ip4;
428         struct sctp_bind_addr *bp;
429         struct sctp_sockaddr_entry *laddr;
430         struct dst_entry *dst = NULL;
431         union sctp_addr *daddr = &t->ipaddr;
432         union sctp_addr dst_saddr;
433
434         memset(fl4, 0x0, sizeof(struct flowi4));
435         fl4->daddr  = daddr->v4.sin_addr.s_addr;
436         fl4->fl4_dport = daddr->v4.sin_port;
437         fl4->flowi4_proto = IPPROTO_SCTP;
438         if (asoc) {
439                 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
440                 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
441                 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
442         }
443         if (saddr) {
444                 fl4->saddr = saddr->v4.sin_addr.s_addr;
445                 fl4->fl4_sport = saddr->v4.sin_port;
446         }
447
448         pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
449                  &fl4->saddr);
450
451         rt = ip_route_output_key(sock_net(sk), fl4);
452         if (!IS_ERR(rt))
453                 dst = &rt->dst;
454
455         /* If there is no association or if a source address is passed, no
456          * more validation is required.
457          */
458         if (!asoc || saddr)
459                 goto out;
460
461         bp = &asoc->base.bind_addr;
462
463         if (dst) {
464                 /* Walk through the bind address list and look for a bind
465                  * address that matches the source address of the returned dst.
466                  */
467                 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
468                 rcu_read_lock();
469                 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
470                         if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
471                             (laddr->state != SCTP_ADDR_SRC &&
472                             !asoc->src_out_of_asoc_ok))
473                                 continue;
474                         if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
475                                 goto out_unlock;
476                 }
477                 rcu_read_unlock();
478
479                 /* None of the bound addresses match the source address of the
480                  * dst. So release it.
481                  */
482                 dst_release(dst);
483                 dst = NULL;
484         }
485
486         /* Walk through the bind address list and try to get a dst that
487          * matches a bind address as the source address.
488          */
489         rcu_read_lock();
490         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
491                 if (!laddr->valid)
492                         continue;
493                 if ((laddr->state == SCTP_ADDR_SRC) &&
494                     (AF_INET == laddr->a.sa.sa_family)) {
495                         fl4->saddr = laddr->a.v4.sin_addr.s_addr;
496                         fl4->fl4_sport = laddr->a.v4.sin_port;
497                         rt = ip_route_output_key(sock_net(sk), fl4);
498                         if (!IS_ERR(rt)) {
499                                 dst = &rt->dst;
500                                 goto out_unlock;
501                         }
502                 }
503         }
504
505 out_unlock:
506         rcu_read_unlock();
507 out:
508         t->dst = dst;
509         if (dst)
510                 pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
511                          &fl4->daddr, &fl4->saddr);
512         else
513                 pr_debug("no route\n");
514 }
515
516 /* For v4, the source address is cached in the route entry(dst). So no need
517  * to cache it separately and hence this is an empty routine.
518  */
519 static void sctp_v4_get_saddr(struct sctp_sock *sk,
520                               struct sctp_transport *t,
521                               struct flowi *fl)
522 {
523         union sctp_addr *saddr = &t->saddr;
524         struct rtable *rt = (struct rtable *)t->dst;
525
526         if (rt) {
527                 saddr->v4.sin_family = AF_INET;
528                 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
529         }
530 }
531
532 /* What interface did this skb arrive on? */
533 static int sctp_v4_skb_iif(const struct sk_buff *skb)
534 {
535         return inet_iif(skb);
536 }
537
538 /* Was this packet marked by Explicit Congestion Notification? */
539 static int sctp_v4_is_ce(const struct sk_buff *skb)
540 {
541         return INET_ECN_is_ce(ip_hdr(skb)->tos);
542 }
543
544 /* Create and initialize a new sk for the socket returned by accept(). */
545 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
546                                              struct sctp_association *asoc)
547 {
548         struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
549                         sk->sk_prot);
550         struct inet_sock *newinet;
551
552         if (!newsk)
553                 goto out;
554
555         sock_init_data(NULL, newsk);
556
557         sctp_copy_sock(newsk, sk, asoc);
558         sock_reset_flag(newsk, SOCK_ZAPPED);
559
560         newinet = inet_sk(newsk);
561
562         newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
563
564         sk_refcnt_debug_inc(newsk);
565
566         if (newsk->sk_prot->init(newsk)) {
567                 sk_common_release(newsk);
568                 newsk = NULL;
569         }
570
571 out:
572         return newsk;
573 }
574
575 /* Map address, empty for v4 family */
576 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
577 {
578         /* Empty */
579 }
580
581 /* Dump the v4 addr to the seq file. */
582 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
583 {
584         seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
585 }
586
587 static void sctp_v4_ecn_capable(struct sock *sk)
588 {
589         INET_ECN_xmit(sk);
590 }
591
592 static void sctp_addr_wq_timeout_handler(unsigned long arg)
593 {
594         struct net *net = (struct net *)arg;
595         struct sctp_sockaddr_entry *addrw, *temp;
596         struct sctp_sock *sp;
597
598         spin_lock_bh(&net->sctp.addr_wq_lock);
599
600         list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
601                 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
602                          "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
603                          addrw->state, addrw);
604
605 #if IS_ENABLED(CONFIG_IPV6)
606                 /* Now we send an ASCONF for each association */
607                 /* Note. we currently don't handle link local IPv6 addressees */
608                 if (addrw->a.sa.sa_family == AF_INET6) {
609                         struct in6_addr *in6;
610
611                         if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
612                             IPV6_ADDR_LINKLOCAL)
613                                 goto free_next;
614
615                         in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
616                         if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
617                             addrw->state == SCTP_ADDR_NEW) {
618                                 unsigned long timeo_val;
619
620                                 pr_debug("%s: this is on DAD, trying %d sec "
621                                          "later\n", __func__,
622                                          SCTP_ADDRESS_TICK_DELAY);
623
624                                 timeo_val = jiffies;
625                                 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
626                                 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
627                                 break;
628                         }
629                 }
630 #endif
631                 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
632                         struct sock *sk;
633
634                         sk = sctp_opt2sk(sp);
635                         /* ignore bound-specific endpoints */
636                         if (!sctp_is_ep_boundall(sk))
637                                 continue;
638                         sctp_bh_lock_sock(sk);
639                         if (sctp_asconf_mgmt(sp, addrw) < 0)
640                                 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
641                         sctp_bh_unlock_sock(sk);
642                 }
643 #if IS_ENABLED(CONFIG_IPV6)
644 free_next:
645 #endif
646                 list_del(&addrw->list);
647                 kfree(addrw);
648         }
649         spin_unlock_bh(&net->sctp.addr_wq_lock);
650 }
651
652 static void sctp_free_addr_wq(struct net *net)
653 {
654         struct sctp_sockaddr_entry *addrw;
655         struct sctp_sockaddr_entry *temp;
656
657         spin_lock_bh(&net->sctp.addr_wq_lock);
658         del_timer(&net->sctp.addr_wq_timer);
659         list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
660                 list_del(&addrw->list);
661                 kfree(addrw);
662         }
663         spin_unlock_bh(&net->sctp.addr_wq_lock);
664 }
665
666 /* lookup the entry for the same address in the addr_waitq
667  * sctp_addr_wq MUST be locked
668  */
669 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
670                                         struct sctp_sockaddr_entry *addr)
671 {
672         struct sctp_sockaddr_entry *addrw;
673
674         list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
675                 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
676                         continue;
677                 if (addrw->a.sa.sa_family == AF_INET) {
678                         if (addrw->a.v4.sin_addr.s_addr ==
679                             addr->a.v4.sin_addr.s_addr)
680                                 return addrw;
681                 } else if (addrw->a.sa.sa_family == AF_INET6) {
682                         if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
683                             &addr->a.v6.sin6_addr))
684                                 return addrw;
685                 }
686         }
687         return NULL;
688 }
689
690 void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
691 {
692         struct sctp_sockaddr_entry *addrw;
693         unsigned long timeo_val;
694
695         /* first, we check if an opposite message already exist in the queue.
696          * If we found such message, it is removed.
697          * This operation is a bit stupid, but the DHCP client attaches the
698          * new address after a couple of addition and deletion of that address
699          */
700
701         spin_lock_bh(&net->sctp.addr_wq_lock);
702         /* Offsets existing events in addr_wq */
703         addrw = sctp_addr_wq_lookup(net, addr);
704         if (addrw) {
705                 if (addrw->state != cmd) {
706                         pr_debug("%s: offsets existing entry for %d, addr:%pISc "
707                                  "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
708                                  &net->sctp.addr_waitq);
709
710                         list_del(&addrw->list);
711                         kfree(addrw);
712                 }
713                 spin_unlock_bh(&net->sctp.addr_wq_lock);
714                 return;
715         }
716
717         /* OK, we have to add the new address to the wait queue */
718         addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
719         if (addrw == NULL) {
720                 spin_unlock_bh(&net->sctp.addr_wq_lock);
721                 return;
722         }
723         addrw->state = cmd;
724         list_add_tail(&addrw->list, &net->sctp.addr_waitq);
725
726         pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
727                  __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
728
729         if (!timer_pending(&net->sctp.addr_wq_timer)) {
730                 timeo_val = jiffies;
731                 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
732                 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
733         }
734         spin_unlock_bh(&net->sctp.addr_wq_lock);
735 }
736
737 /* Event handler for inet address addition/deletion events.
738  * The sctp_local_addr_list needs to be protocted by a spin lock since
739  * multiple notifiers (say IPv4 and IPv6) may be running at the same
740  * time and thus corrupt the list.
741  * The reader side is protected with RCU.
742  */
743 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
744                                void *ptr)
745 {
746         struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
747         struct sctp_sockaddr_entry *addr = NULL;
748         struct sctp_sockaddr_entry *temp;
749         struct net *net = dev_net(ifa->ifa_dev->dev);
750         int found = 0;
751
752         switch (ev) {
753         case NETDEV_UP:
754                 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
755                 if (addr) {
756                         addr->a.v4.sin_family = AF_INET;
757                         addr->a.v4.sin_port = 0;
758                         addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
759                         addr->valid = 1;
760                         spin_lock_bh(&net->sctp.local_addr_lock);
761                         list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
762                         sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
763                         spin_unlock_bh(&net->sctp.local_addr_lock);
764                 }
765                 break;
766         case NETDEV_DOWN:
767                 spin_lock_bh(&net->sctp.local_addr_lock);
768                 list_for_each_entry_safe(addr, temp,
769                                         &net->sctp.local_addr_list, list) {
770                         if (addr->a.sa.sa_family == AF_INET &&
771                                         addr->a.v4.sin_addr.s_addr ==
772                                         ifa->ifa_local) {
773                                 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
774                                 found = 1;
775                                 addr->valid = 0;
776                                 list_del_rcu(&addr->list);
777                                 break;
778                         }
779                 }
780                 spin_unlock_bh(&net->sctp.local_addr_lock);
781                 if (found)
782                         kfree_rcu(addr, rcu);
783                 break;
784         }
785
786         return NOTIFY_DONE;
787 }
788
789 /*
790  * Initialize the control inode/socket with a control endpoint data
791  * structure.  This endpoint is reserved exclusively for the OOTB processing.
792  */
793 static int sctp_ctl_sock_init(struct net *net)
794 {
795         int err;
796         sa_family_t family = PF_INET;
797
798         if (sctp_get_pf_specific(PF_INET6))
799                 family = PF_INET6;
800
801         err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
802                                    SOCK_SEQPACKET, IPPROTO_SCTP, net);
803
804         /* If IPv6 socket could not be created, try the IPv4 socket */
805         if (err < 0 && family == PF_INET6)
806                 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
807                                            SOCK_SEQPACKET, IPPROTO_SCTP,
808                                            net);
809
810         if (err < 0) {
811                 pr_err("Failed to create the SCTP control socket\n");
812                 return err;
813         }
814         return 0;
815 }
816
817 /* Register address family specific functions. */
818 int sctp_register_af(struct sctp_af *af)
819 {
820         switch (af->sa_family) {
821         case AF_INET:
822                 if (sctp_af_v4_specific)
823                         return 0;
824                 sctp_af_v4_specific = af;
825                 break;
826         case AF_INET6:
827                 if (sctp_af_v6_specific)
828                         return 0;
829                 sctp_af_v6_specific = af;
830                 break;
831         default:
832                 return 0;
833         }
834
835         INIT_LIST_HEAD(&af->list);
836         list_add_tail(&af->list, &sctp_address_families);
837         return 1;
838 }
839
840 /* Get the table of functions for manipulating a particular address
841  * family.
842  */
843 struct sctp_af *sctp_get_af_specific(sa_family_t family)
844 {
845         switch (family) {
846         case AF_INET:
847                 return sctp_af_v4_specific;
848         case AF_INET6:
849                 return sctp_af_v6_specific;
850         default:
851                 return NULL;
852         }
853 }
854
855 /* Common code to initialize a AF_INET msg_name. */
856 static void sctp_inet_msgname(char *msgname, int *addr_len)
857 {
858         struct sockaddr_in *sin;
859
860         sin = (struct sockaddr_in *)msgname;
861         *addr_len = sizeof(struct sockaddr_in);
862         sin->sin_family = AF_INET;
863         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
864 }
865
866 /* Copy the primary address of the peer primary address as the msg_name. */
867 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
868                                     int *addr_len)
869 {
870         struct sockaddr_in *sin, *sinfrom;
871
872         if (msgname) {
873                 struct sctp_association *asoc;
874
875                 asoc = event->asoc;
876                 sctp_inet_msgname(msgname, addr_len);
877                 sin = (struct sockaddr_in *)msgname;
878                 sinfrom = &asoc->peer.primary_addr.v4;
879                 sin->sin_port = htons(asoc->peer.port);
880                 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
881         }
882 }
883
884 /* Initialize and copy out a msgname from an inbound skb. */
885 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
886 {
887         if (msgname) {
888                 struct sctphdr *sh = sctp_hdr(skb);
889                 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
890
891                 sctp_inet_msgname(msgname, len);
892                 sin->sin_port = sh->source;
893                 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
894         }
895 }
896
897 /* Do we support this AF? */
898 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
899 {
900         /* PF_INET only supports AF_INET addresses. */
901         return AF_INET == family;
902 }
903
904 /* Address matching with wildcards allowed. */
905 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
906                               const union sctp_addr *addr2,
907                               struct sctp_sock *opt)
908 {
909         /* PF_INET only supports AF_INET addresses. */
910         if (addr1->sa.sa_family != addr2->sa.sa_family)
911                 return 0;
912         if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
913             htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
914                 return 1;
915         if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
916                 return 1;
917
918         return 0;
919 }
920
921 /* Verify that provided sockaddr looks bindable.  Common verification has
922  * already been taken care of.
923  */
924 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
925 {
926         return sctp_v4_available(addr, opt);
927 }
928
929 /* Verify that sockaddr looks sendable.  Common verification has already
930  * been taken care of.
931  */
932 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
933 {
934         return 1;
935 }
936
937 /* Fill in Supported Address Type information for INIT and INIT-ACK
938  * chunks.  Returns number of addresses supported.
939  */
940 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
941                                      __be16 *types)
942 {
943         types[0] = SCTP_PARAM_IPV4_ADDRESS;
944         return 1;
945 }
946
947 /* Wrapper routine that calls the ip transmit routine. */
948 static inline int sctp_v4_xmit(struct sk_buff *skb,
949                                struct sctp_transport *transport)
950 {
951         struct inet_sock *inet = inet_sk(skb->sk);
952
953         pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
954                  skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr);
955
956         inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
957                          IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
958
959         SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
960
961         return ip_queue_xmit(skb, &transport->fl);
962 }
963
964 static struct sctp_af sctp_af_inet;
965
966 static struct sctp_pf sctp_pf_inet = {
967         .event_msgname = sctp_inet_event_msgname,
968         .skb_msgname   = sctp_inet_skb_msgname,
969         .af_supported  = sctp_inet_af_supported,
970         .cmp_addr      = sctp_inet_cmp_addr,
971         .bind_verify   = sctp_inet_bind_verify,
972         .send_verify   = sctp_inet_send_verify,
973         .supported_addrs = sctp_inet_supported_addrs,
974         .create_accept_sk = sctp_v4_create_accept_sk,
975         .addr_v4map     = sctp_v4_addr_v4map,
976         .af            = &sctp_af_inet
977 };
978
979 /* Notifier for inetaddr addition/deletion events.  */
980 static struct notifier_block sctp_inetaddr_notifier = {
981         .notifier_call = sctp_inetaddr_event,
982 };
983
984 /* Socket operations.  */
985 static const struct proto_ops inet_seqpacket_ops = {
986         .family            = PF_INET,
987         .owner             = THIS_MODULE,
988         .release           = inet_release,      /* Needs to be wrapped... */
989         .bind              = inet_bind,
990         .connect           = inet_dgram_connect,
991         .socketpair        = sock_no_socketpair,
992         .accept            = inet_accept,
993         .getname           = inet_getname,      /* Semantics are different.  */
994         .poll              = sctp_poll,
995         .ioctl             = inet_ioctl,
996         .listen            = sctp_inet_listen,
997         .shutdown          = inet_shutdown,     /* Looks harmless.  */
998         .setsockopt        = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
999         .getsockopt        = sock_common_getsockopt,
1000         .sendmsg           = inet_sendmsg,
1001         .recvmsg           = sock_common_recvmsg,
1002         .mmap              = sock_no_mmap,
1003         .sendpage          = sock_no_sendpage,
1004 #ifdef CONFIG_COMPAT
1005         .compat_setsockopt = compat_sock_common_setsockopt,
1006         .compat_getsockopt = compat_sock_common_getsockopt,
1007 #endif
1008 };
1009
1010 /* Registration with AF_INET family.  */
1011 static struct inet_protosw sctp_seqpacket_protosw = {
1012         .type       = SOCK_SEQPACKET,
1013         .protocol   = IPPROTO_SCTP,
1014         .prot       = &sctp_prot,
1015         .ops        = &inet_seqpacket_ops,
1016         .no_check   = 0,
1017         .flags      = SCTP_PROTOSW_FLAG
1018 };
1019 static struct inet_protosw sctp_stream_protosw = {
1020         .type       = SOCK_STREAM,
1021         .protocol   = IPPROTO_SCTP,
1022         .prot       = &sctp_prot,
1023         .ops        = &inet_seqpacket_ops,
1024         .no_check   = 0,
1025         .flags      = SCTP_PROTOSW_FLAG
1026 };
1027
1028 /* Register with IP layer.  */
1029 static const struct net_protocol sctp_protocol = {
1030         .handler     = sctp_rcv,
1031         .err_handler = sctp_v4_err,
1032         .no_policy   = 1,
1033         .netns_ok    = 1,
1034 };
1035
1036 /* IPv4 address related functions.  */
1037 static struct sctp_af sctp_af_inet = {
1038         .sa_family         = AF_INET,
1039         .sctp_xmit         = sctp_v4_xmit,
1040         .setsockopt        = ip_setsockopt,
1041         .getsockopt        = ip_getsockopt,
1042         .get_dst           = sctp_v4_get_dst,
1043         .get_saddr         = sctp_v4_get_saddr,
1044         .copy_addrlist     = sctp_v4_copy_addrlist,
1045         .from_skb          = sctp_v4_from_skb,
1046         .from_sk           = sctp_v4_from_sk,
1047         .to_sk_saddr       = sctp_v4_to_sk_saddr,
1048         .to_sk_daddr       = sctp_v4_to_sk_daddr,
1049         .from_addr_param   = sctp_v4_from_addr_param,
1050         .to_addr_param     = sctp_v4_to_addr_param,
1051         .cmp_addr          = sctp_v4_cmp_addr,
1052         .addr_valid        = sctp_v4_addr_valid,
1053         .inaddr_any        = sctp_v4_inaddr_any,
1054         .is_any            = sctp_v4_is_any,
1055         .available         = sctp_v4_available,
1056         .scope             = sctp_v4_scope,
1057         .skb_iif           = sctp_v4_skb_iif,
1058         .is_ce             = sctp_v4_is_ce,
1059         .seq_dump_addr     = sctp_v4_seq_dump_addr,
1060         .ecn_capable       = sctp_v4_ecn_capable,
1061         .net_header_len    = sizeof(struct iphdr),
1062         .sockaddr_len      = sizeof(struct sockaddr_in),
1063 #ifdef CONFIG_COMPAT
1064         .compat_setsockopt = compat_ip_setsockopt,
1065         .compat_getsockopt = compat_ip_getsockopt,
1066 #endif
1067 };
1068
1069 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
1070
1071         switch (family) {
1072         case PF_INET:
1073                 return sctp_pf_inet_specific;
1074         case PF_INET6:
1075                 return sctp_pf_inet6_specific;
1076         default:
1077                 return NULL;
1078         }
1079 }
1080
1081 /* Register the PF specific function table.  */
1082 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1083 {
1084         switch (family) {
1085         case PF_INET:
1086                 if (sctp_pf_inet_specific)
1087                         return 0;
1088                 sctp_pf_inet_specific = pf;
1089                 break;
1090         case PF_INET6:
1091                 if (sctp_pf_inet6_specific)
1092                         return 0;
1093                 sctp_pf_inet6_specific = pf;
1094                 break;
1095         default:
1096                 return 0;
1097         }
1098         return 1;
1099 }
1100
1101 static inline int init_sctp_mibs(struct net *net)
1102 {
1103         return snmp_mib_init((void __percpu **)net->sctp.sctp_statistics,
1104                              sizeof(struct sctp_mib),
1105                              __alignof__(struct sctp_mib));
1106 }
1107
1108 static inline void cleanup_sctp_mibs(struct net *net)
1109 {
1110         snmp_mib_free((void __percpu **)net->sctp.sctp_statistics);
1111 }
1112
1113 static void sctp_v4_pf_init(void)
1114 {
1115         /* Initialize the SCTP specific PF functions. */
1116         sctp_register_pf(&sctp_pf_inet, PF_INET);
1117         sctp_register_af(&sctp_af_inet);
1118 }
1119
1120 static void sctp_v4_pf_exit(void)
1121 {
1122         list_del(&sctp_af_inet.list);
1123 }
1124
1125 static int sctp_v4_protosw_init(void)
1126 {
1127         int rc;
1128
1129         rc = proto_register(&sctp_prot, 1);
1130         if (rc)
1131                 return rc;
1132
1133         /* Register SCTP(UDP and TCP style) with socket layer.  */
1134         inet_register_protosw(&sctp_seqpacket_protosw);
1135         inet_register_protosw(&sctp_stream_protosw);
1136
1137         return 0;
1138 }
1139
1140 static void sctp_v4_protosw_exit(void)
1141 {
1142         inet_unregister_protosw(&sctp_stream_protosw);
1143         inet_unregister_protosw(&sctp_seqpacket_protosw);
1144         proto_unregister(&sctp_prot);
1145 }
1146
1147 static int sctp_v4_add_protocol(void)
1148 {
1149         /* Register notifier for inet address additions/deletions. */
1150         register_inetaddr_notifier(&sctp_inetaddr_notifier);
1151
1152         /* Register SCTP with inet layer.  */
1153         if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1154                 return -EAGAIN;
1155
1156         return 0;
1157 }
1158
1159 static void sctp_v4_del_protocol(void)
1160 {
1161         inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1162         unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1163 }
1164
1165 static int __net_init sctp_net_init(struct net *net)
1166 {
1167         int status;
1168
1169         /*
1170          * 14. Suggested SCTP Protocol Parameter Values
1171          */
1172         /* The following protocol parameters are RECOMMENDED:  */
1173         /* RTO.Initial              - 3  seconds */
1174         net->sctp.rto_initial                   = SCTP_RTO_INITIAL;
1175         /* RTO.Min                  - 1  second */
1176         net->sctp.rto_min                       = SCTP_RTO_MIN;
1177         /* RTO.Max                 -  60 seconds */
1178         net->sctp.rto_max                       = SCTP_RTO_MAX;
1179         /* RTO.Alpha                - 1/8 */
1180         net->sctp.rto_alpha                     = SCTP_RTO_ALPHA;
1181         /* RTO.Beta                 - 1/4 */
1182         net->sctp.rto_beta                      = SCTP_RTO_BETA;
1183
1184         /* Valid.Cookie.Life        - 60  seconds */
1185         net->sctp.valid_cookie_life             = SCTP_DEFAULT_COOKIE_LIFE;
1186
1187         /* Whether Cookie Preservative is enabled(1) or not(0) */
1188         net->sctp.cookie_preserve_enable        = 1;
1189
1190         /* Default sctp sockets to use md5 as their hmac alg */
1191 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1192         net->sctp.sctp_hmac_alg                 = "md5";
1193 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1194         net->sctp.sctp_hmac_alg                 = "sha1";
1195 #else
1196         net->sctp.sctp_hmac_alg                 = NULL;
1197 #endif
1198
1199         /* Max.Burst                - 4 */
1200         net->sctp.max_burst                     = SCTP_DEFAULT_MAX_BURST;
1201
1202         /* Association.Max.Retrans  - 10 attempts
1203          * Path.Max.Retrans         - 5  attempts (per destination address)
1204          * Max.Init.Retransmits     - 8  attempts
1205          */
1206         net->sctp.max_retrans_association       = 10;
1207         net->sctp.max_retrans_path              = 5;
1208         net->sctp.max_retrans_init              = 8;
1209
1210         /* Sendbuffer growth        - do per-socket accounting */
1211         net->sctp.sndbuf_policy                 = 0;
1212
1213         /* Rcvbuffer growth         - do per-socket accounting */
1214         net->sctp.rcvbuf_policy                 = 0;
1215
1216         /* HB.interval              - 30 seconds */
1217         net->sctp.hb_interval                   = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1218
1219         /* delayed SACK timeout */
1220         net->sctp.sack_timeout                  = SCTP_DEFAULT_TIMEOUT_SACK;
1221
1222         /* Disable ADDIP by default. */
1223         net->sctp.addip_enable = 0;
1224         net->sctp.addip_noauth = 0;
1225         net->sctp.default_auto_asconf = 0;
1226
1227         /* Enable PR-SCTP by default. */
1228         net->sctp.prsctp_enable = 1;
1229
1230         /* Disable AUTH by default. */
1231         net->sctp.auth_enable = 0;
1232
1233         /* Set SCOPE policy to enabled */
1234         net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1235
1236         /* Set the default rwnd update threshold */
1237         net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1238
1239         /* Initialize maximum autoclose timeout. */
1240         net->sctp.max_autoclose         = INT_MAX / HZ;
1241
1242         status = sctp_sysctl_net_register(net);
1243         if (status)
1244                 goto err_sysctl_register;
1245
1246         /* Allocate and initialise sctp mibs.  */
1247         status = init_sctp_mibs(net);
1248         if (status)
1249                 goto err_init_mibs;
1250
1251         /* Initialize proc fs directory.  */
1252         status = sctp_proc_init(net);
1253         if (status)
1254                 goto err_init_proc;
1255
1256         sctp_dbg_objcnt_init(net);
1257
1258         /* Initialize the control inode/socket for handling OOTB packets.  */
1259         if ((status = sctp_ctl_sock_init(net))) {
1260                 pr_err("Failed to initialize the SCTP control sock\n");
1261                 goto err_ctl_sock_init;
1262         }
1263
1264         /* Initialize the local address list. */
1265         INIT_LIST_HEAD(&net->sctp.local_addr_list);
1266         spin_lock_init(&net->sctp.local_addr_lock);
1267         sctp_get_local_addr_list(net);
1268
1269         /* Initialize the address event list */
1270         INIT_LIST_HEAD(&net->sctp.addr_waitq);
1271         INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1272         spin_lock_init(&net->sctp.addr_wq_lock);
1273         net->sctp.addr_wq_timer.expires = 0;
1274         setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler,
1275                     (unsigned long)net);
1276
1277         return 0;
1278
1279 err_ctl_sock_init:
1280         sctp_dbg_objcnt_exit(net);
1281         sctp_proc_exit(net);
1282 err_init_proc:
1283         cleanup_sctp_mibs(net);
1284 err_init_mibs:
1285         sctp_sysctl_net_unregister(net);
1286 err_sysctl_register:
1287         return status;
1288 }
1289
1290 static void __net_exit sctp_net_exit(struct net *net)
1291 {
1292         /* Free the local address list */
1293         sctp_free_addr_wq(net);
1294         sctp_free_local_addr_list(net);
1295
1296         /* Free the control endpoint.  */
1297         inet_ctl_sock_destroy(net->sctp.ctl_sock);
1298
1299         sctp_dbg_objcnt_exit(net);
1300
1301         sctp_proc_exit(net);
1302         cleanup_sctp_mibs(net);
1303         sctp_sysctl_net_unregister(net);
1304 }
1305
1306 static struct pernet_operations sctp_net_ops = {
1307         .init = sctp_net_init,
1308         .exit = sctp_net_exit,
1309 };
1310
1311 /* Initialize the universe into something sensible.  */
1312 static __init int sctp_init(void)
1313 {
1314         int i;
1315         int status = -EINVAL;
1316         unsigned long goal;
1317         unsigned long limit;
1318         int max_share;
1319         int order;
1320
1321         BUILD_BUG_ON(sizeof(struct sctp_ulpevent) >
1322                      sizeof(((struct sk_buff *) 0)->cb));
1323
1324         /* Allocate bind_bucket and chunk caches. */
1325         status = -ENOBUFS;
1326         sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1327                                                sizeof(struct sctp_bind_bucket),
1328                                                0, SLAB_HWCACHE_ALIGN,
1329                                                NULL);
1330         if (!sctp_bucket_cachep)
1331                 goto out;
1332
1333         sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1334                                                sizeof(struct sctp_chunk),
1335                                                0, SLAB_HWCACHE_ALIGN,
1336                                                NULL);
1337         if (!sctp_chunk_cachep)
1338                 goto err_chunk_cachep;
1339
1340         status = percpu_counter_init(&sctp_sockets_allocated, 0);
1341         if (status)
1342                 goto err_percpu_counter_init;
1343
1344         /* Implementation specific variables. */
1345
1346         /* Initialize default stream count setup information. */
1347         sctp_max_instreams              = SCTP_DEFAULT_INSTREAMS;
1348         sctp_max_outstreams             = SCTP_DEFAULT_OUTSTREAMS;
1349
1350         /* Initialize handle used for association ids. */
1351         idr_init(&sctp_assocs_id);
1352
1353         limit = nr_free_buffer_pages() / 8;
1354         limit = max(limit, 128UL);
1355         sysctl_sctp_mem[0] = limit / 4 * 3;
1356         sysctl_sctp_mem[1] = limit;
1357         sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1358
1359         /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1360         limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1361         max_share = min(4UL*1024*1024, limit);
1362
1363         sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1364         sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1365         sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1366
1367         sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1368         sysctl_sctp_wmem[1] = 16*1024;
1369         sysctl_sctp_wmem[2] = max(64*1024, max_share);
1370
1371         /* Size and allocate the association hash table.
1372          * The methodology is similar to that of the tcp hash tables.
1373          */
1374         if (totalram_pages >= (128 * 1024))
1375                 goal = totalram_pages >> (22 - PAGE_SHIFT);
1376         else
1377                 goal = totalram_pages >> (24 - PAGE_SHIFT);
1378
1379         for (order = 0; (1UL << order) < goal; order++)
1380                 ;
1381
1382         do {
1383                 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1384                                         sizeof(struct sctp_hashbucket);
1385                 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1386                         continue;
1387                 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1388                         __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1389         } while (!sctp_assoc_hashtable && --order > 0);
1390         if (!sctp_assoc_hashtable) {
1391                 pr_err("Failed association hash alloc\n");
1392                 status = -ENOMEM;
1393                 goto err_ahash_alloc;
1394         }
1395         for (i = 0; i < sctp_assoc_hashsize; i++) {
1396                 rwlock_init(&sctp_assoc_hashtable[i].lock);
1397                 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
1398         }
1399
1400         /* Allocate and initialize the endpoint hash table.  */
1401         sctp_ep_hashsize = 64;
1402         sctp_ep_hashtable =
1403                 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1404         if (!sctp_ep_hashtable) {
1405                 pr_err("Failed endpoint_hash alloc\n");
1406                 status = -ENOMEM;
1407                 goto err_ehash_alloc;
1408         }
1409         for (i = 0; i < sctp_ep_hashsize; i++) {
1410                 rwlock_init(&sctp_ep_hashtable[i].lock);
1411                 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1412         }
1413
1414         /* Allocate and initialize the SCTP port hash table.  */
1415         do {
1416                 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1417                                         sizeof(struct sctp_bind_hashbucket);
1418                 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1419                         continue;
1420                 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1421                         __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1422         } while (!sctp_port_hashtable && --order > 0);
1423         if (!sctp_port_hashtable) {
1424                 pr_err("Failed bind hash alloc\n");
1425                 status = -ENOMEM;
1426                 goto err_bhash_alloc;
1427         }
1428         for (i = 0; i < sctp_port_hashsize; i++) {
1429                 spin_lock_init(&sctp_port_hashtable[i].lock);
1430                 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1431         }
1432
1433         pr_info("Hash tables configured (established %d bind %d)\n",
1434                 sctp_assoc_hashsize, sctp_port_hashsize);
1435
1436         sctp_sysctl_register();
1437
1438         INIT_LIST_HEAD(&sctp_address_families);
1439         sctp_v4_pf_init();
1440         sctp_v6_pf_init();
1441
1442         status = sctp_v4_protosw_init();
1443
1444         if (status)
1445                 goto err_protosw_init;
1446
1447         status = sctp_v6_protosw_init();
1448         if (status)
1449                 goto err_v6_protosw_init;
1450
1451         status = register_pernet_subsys(&sctp_net_ops);
1452         if (status)
1453                 goto err_register_pernet_subsys;
1454
1455         status = sctp_v4_add_protocol();
1456         if (status)
1457                 goto err_add_protocol;
1458
1459         /* Register SCTP with inet6 layer.  */
1460         status = sctp_v6_add_protocol();
1461         if (status)
1462                 goto err_v6_add_protocol;
1463
1464         status = 0;
1465 out:
1466         return status;
1467 err_v6_add_protocol:
1468         sctp_v4_del_protocol();
1469 err_add_protocol:
1470         unregister_pernet_subsys(&sctp_net_ops);
1471 err_register_pernet_subsys:
1472         sctp_v6_protosw_exit();
1473 err_v6_protosw_init:
1474         sctp_v4_protosw_exit();
1475 err_protosw_init:
1476         sctp_v4_pf_exit();
1477         sctp_v6_pf_exit();
1478         sctp_sysctl_unregister();
1479         free_pages((unsigned long)sctp_port_hashtable,
1480                    get_order(sctp_port_hashsize *
1481                              sizeof(struct sctp_bind_hashbucket)));
1482 err_bhash_alloc:
1483         kfree(sctp_ep_hashtable);
1484 err_ehash_alloc:
1485         free_pages((unsigned long)sctp_assoc_hashtable,
1486                    get_order(sctp_assoc_hashsize *
1487                              sizeof(struct sctp_hashbucket)));
1488 err_ahash_alloc:
1489         percpu_counter_destroy(&sctp_sockets_allocated);
1490 err_percpu_counter_init:
1491         kmem_cache_destroy(sctp_chunk_cachep);
1492 err_chunk_cachep:
1493         kmem_cache_destroy(sctp_bucket_cachep);
1494         goto out;
1495 }
1496
1497 /* Exit handler for the SCTP protocol.  */
1498 static __exit void sctp_exit(void)
1499 {
1500         /* BUG.  This should probably do something useful like clean
1501          * up all the remaining associations and all that memory.
1502          */
1503
1504         /* Unregister with inet6/inet layers. */
1505         sctp_v6_del_protocol();
1506         sctp_v4_del_protocol();
1507
1508         unregister_pernet_subsys(&sctp_net_ops);
1509
1510         /* Free protosw registrations */
1511         sctp_v6_protosw_exit();
1512         sctp_v4_protosw_exit();
1513
1514         /* Unregister with socket layer. */
1515         sctp_v6_pf_exit();
1516         sctp_v4_pf_exit();
1517
1518         sctp_sysctl_unregister();
1519
1520         free_pages((unsigned long)sctp_assoc_hashtable,
1521                    get_order(sctp_assoc_hashsize *
1522                              sizeof(struct sctp_hashbucket)));
1523         kfree(sctp_ep_hashtable);
1524         free_pages((unsigned long)sctp_port_hashtable,
1525                    get_order(sctp_port_hashsize *
1526                              sizeof(struct sctp_bind_hashbucket)));
1527
1528         percpu_counter_destroy(&sctp_sockets_allocated);
1529
1530         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1531
1532         kmem_cache_destroy(sctp_chunk_cachep);
1533         kmem_cache_destroy(sctp_bucket_cachep);
1534 }
1535
1536 module_init(sctp_init);
1537 module_exit(sctp_exit);
1538
1539 /*
1540  * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1541  */
1542 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1543 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1544 MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
1545 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1546 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1547 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1548 MODULE_LICENSE("GPL");