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TOMOYO Linux Cross Reference
Linux/net/sctp/protocol.c

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  1 /* SCTP kernel implementation
  2  * (C) Copyright IBM Corp. 2001, 2004
  3  * Copyright (c) 1999-2000 Cisco, Inc.
  4  * Copyright (c) 1999-2001 Motorola, Inc.
  5  * Copyright (c) 2001 Intel Corp.
  6  * Copyright (c) 2001 Nokia, Inc.
  7  * Copyright (c) 2001 La Monte H.P. Yarroll
  8  *
  9  * This file is part of the SCTP kernel implementation
 10  *
 11  * Initialization/cleanup for SCTP protocol support.
 12  *
 13  * This SCTP implementation is free software;
 14  * you can redistribute it and/or modify it under the terms of
 15  * the GNU General Public License as published by
 16  * the Free Software Foundation; either version 2, or (at your option)
 17  * any later version.
 18  *
 19  * This SCTP implementation is distributed in the hope that it
 20  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
 21  *                 ************************
 22  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 23  * See the GNU General Public License for more details.
 24  *
 25  * You should have received a copy of the GNU General Public License
 26  * along with GNU CC; see the file COPYING.  If not, write to
 27  * the Free Software Foundation, 59 Temple Place - Suite 330,
 28  * Boston, MA 02111-1307, USA.
 29  *
 30  * Please send any bug reports or fixes you make to the
 31  * email address(es):
 32  *    lksctp developers <lksctp-developers@lists.sourceforge.net>
 33  *
 34  * Or submit a bug report through the following website:
 35  *    http://www.sf.net/projects/lksctp
 36  *
 37  * Written or modified by:
 38  *    La Monte H.P. Yarroll <piggy@acm.org>
 39  *    Karl Knutson <karl@athena.chicago.il.us>
 40  *    Jon Grimm <jgrimm@us.ibm.com>
 41  *    Sridhar Samudrala <sri@us.ibm.com>
 42  *    Daisy Chang <daisyc@us.ibm.com>
 43  *    Ardelle Fan <ardelle.fan@intel.com>
 44  *
 45  * Any bugs reported given to us we will try to fix... any fixes shared will
 46  * be incorporated into the next SCTP release.
 47  */
 48 
 49 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 50 
 51 #include <linux/module.h>
 52 #include <linux/init.h>
 53 #include <linux/netdevice.h>
 54 #include <linux/inetdevice.h>
 55 #include <linux/seq_file.h>
 56 #include <linux/bootmem.h>
 57 #include <linux/highmem.h>
 58 #include <linux/swap.h>
 59 #include <linux/slab.h>
 60 #include <net/net_namespace.h>
 61 #include <net/protocol.h>
 62 #include <net/ip.h>
 63 #include <net/ipv6.h>
 64 #include <net/route.h>
 65 #include <net/sctp/sctp.h>
 66 #include <net/addrconf.h>
 67 #include <net/inet_common.h>
 68 #include <net/inet_ecn.h>
 69 
 70 /* Global data structures. */
 71 struct sctp_globals sctp_globals __read_mostly;
 72 
 73 struct idr sctp_assocs_id;
 74 DEFINE_SPINLOCK(sctp_assocs_id_lock);
 75 
 76 static struct sctp_pf *sctp_pf_inet6_specific;
 77 static struct sctp_pf *sctp_pf_inet_specific;
 78 static struct sctp_af *sctp_af_v4_specific;
 79 static struct sctp_af *sctp_af_v6_specific;
 80 
 81 struct kmem_cache *sctp_chunk_cachep __read_mostly;
 82 struct kmem_cache *sctp_bucket_cachep __read_mostly;
 83 
 84 long sysctl_sctp_mem[3];
 85 int sysctl_sctp_rmem[3];
 86 int sysctl_sctp_wmem[3];
 87 
 88 /* Set up the proc fs entry for the SCTP protocol. */
 89 static int __net_init sctp_proc_init(struct net *net)
 90 {
 91 #ifdef CONFIG_PROC_FS
 92         net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net);
 93         if (!net->sctp.proc_net_sctp)
 94                 goto out_proc_net_sctp;
 95         if (sctp_snmp_proc_init(net))
 96                 goto out_snmp_proc_init;
 97         if (sctp_eps_proc_init(net))
 98                 goto out_eps_proc_init;
 99         if (sctp_assocs_proc_init(net))
100                 goto out_assocs_proc_init;
101         if (sctp_remaddr_proc_init(net))
102                 goto out_remaddr_proc_init;
103 
104         return 0;
105 
106 out_remaddr_proc_init:
107         sctp_assocs_proc_exit(net);
108 out_assocs_proc_init:
109         sctp_eps_proc_exit(net);
110 out_eps_proc_init:
111         sctp_snmp_proc_exit(net);
112 out_snmp_proc_init:
113         remove_proc_entry("sctp", net->proc_net);
114         net->sctp.proc_net_sctp = NULL;
115 out_proc_net_sctp:
116         return -ENOMEM;
117 #endif /* CONFIG_PROC_FS */
118         return 0;
119 }
120 
121 /* Clean up the proc fs entry for the SCTP protocol.
122  * Note: Do not make this __exit as it is used in the init error
123  * path.
124  */
125 static void sctp_proc_exit(struct net *net)
126 {
127 #ifdef CONFIG_PROC_FS
128         sctp_snmp_proc_exit(net);
129         sctp_eps_proc_exit(net);
130         sctp_assocs_proc_exit(net);
131         sctp_remaddr_proc_exit(net);
132 
133         remove_proc_entry("sctp", net->proc_net);
134         net->sctp.proc_net_sctp = NULL;
135 #endif
136 }
137 
138 /* Private helper to extract ipv4 address and stash them in
139  * the protocol structure.
140  */
141 static void sctp_v4_copy_addrlist(struct list_head *addrlist,
142                                   struct net_device *dev)
143 {
144         struct in_device *in_dev;
145         struct in_ifaddr *ifa;
146         struct sctp_sockaddr_entry *addr;
147 
148         rcu_read_lock();
149         if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
150                 rcu_read_unlock();
151                 return;
152         }
153 
154         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
155                 /* Add the address to the local list.  */
156                 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
157                 if (addr) {
158                         addr->a.v4.sin_family = AF_INET;
159                         addr->a.v4.sin_port = 0;
160                         addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
161                         addr->valid = 1;
162                         INIT_LIST_HEAD(&addr->list);
163                         list_add_tail(&addr->list, addrlist);
164                 }
165         }
166 
167         rcu_read_unlock();
168 }
169 
170 /* Extract our IP addresses from the system and stash them in the
171  * protocol structure.
172  */
173 static void sctp_get_local_addr_list(struct net *net)
174 {
175         struct net_device *dev;
176         struct list_head *pos;
177         struct sctp_af *af;
178 
179         rcu_read_lock();
180         for_each_netdev_rcu(net, dev) {
181                 __list_for_each(pos, &sctp_address_families) {
182                         af = list_entry(pos, struct sctp_af, list);
183                         af->copy_addrlist(&net->sctp.local_addr_list, dev);
184                 }
185         }
186         rcu_read_unlock();
187 }
188 
189 /* Free the existing local addresses.  */
190 static void sctp_free_local_addr_list(struct net *net)
191 {
192         struct sctp_sockaddr_entry *addr;
193         struct list_head *pos, *temp;
194 
195         list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
196                 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
197                 list_del(pos);
198                 kfree(addr);
199         }
200 }
201 
202 /* Copy the local addresses which are valid for 'scope' into 'bp'.  */
203 int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
204                               sctp_scope_t scope, gfp_t gfp, int copy_flags)
205 {
206         struct sctp_sockaddr_entry *addr;
207         int error = 0;
208 
209         rcu_read_lock();
210         list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
211                 if (!addr->valid)
212                         continue;
213                 if (sctp_in_scope(net, &addr->a, scope)) {
214                         /* Now that the address is in scope, check to see if
215                          * the address type is really supported by the local
216                          * sock as well as the remote peer.
217                          */
218                         if ((((AF_INET == addr->a.sa.sa_family) &&
219                               (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
220                             (((AF_INET6 == addr->a.sa.sa_family) &&
221                               (copy_flags & SCTP_ADDR6_ALLOWED) &&
222                               (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
223                                 error = sctp_add_bind_addr(bp, &addr->a,
224                                                     SCTP_ADDR_SRC, GFP_ATOMIC);
225                                 if (error)
226                                         goto end_copy;
227                         }
228                 }
229         }
230 
231 end_copy:
232         rcu_read_unlock();
233         return error;
234 }
235 
236 /* Initialize a sctp_addr from in incoming skb.  */
237 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
238                              int is_saddr)
239 {
240         void *from;
241         __be16 *port;
242         struct sctphdr *sh;
243 
244         port = &addr->v4.sin_port;
245         addr->v4.sin_family = AF_INET;
246 
247         sh = sctp_hdr(skb);
248         if (is_saddr) {
249                 *port  = sh->source;
250                 from = &ip_hdr(skb)->saddr;
251         } else {
252                 *port = sh->dest;
253                 from = &ip_hdr(skb)->daddr;
254         }
255         memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
256 }
257 
258 /* Initialize an sctp_addr from a socket. */
259 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
260 {
261         addr->v4.sin_family = AF_INET;
262         addr->v4.sin_port = 0;
263         addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
264 }
265 
266 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
267 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
268 {
269         inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
270 }
271 
272 /* Initialize sk->sk_daddr from sctp_addr. */
273 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
274 {
275         inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
276 }
277 
278 /* Initialize a sctp_addr from an address parameter. */
279 static void sctp_v4_from_addr_param(union sctp_addr *addr,
280                                     union sctp_addr_param *param,
281                                     __be16 port, int iif)
282 {
283         addr->v4.sin_family = AF_INET;
284         addr->v4.sin_port = port;
285         addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
286 }
287 
288 /* Initialize an address parameter from a sctp_addr and return the length
289  * of the address parameter.
290  */
291 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
292                                  union sctp_addr_param *param)
293 {
294         int length = sizeof(sctp_ipv4addr_param_t);
295 
296         param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
297         param->v4.param_hdr.length = htons(length);
298         param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
299 
300         return length;
301 }
302 
303 /* Initialize a sctp_addr from a dst_entry. */
304 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
305                               __be16 port)
306 {
307         saddr->v4.sin_family = AF_INET;
308         saddr->v4.sin_port = port;
309         saddr->v4.sin_addr.s_addr = fl4->saddr;
310 }
311 
312 /* Compare two addresses exactly. */
313 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
314                             const union sctp_addr *addr2)
315 {
316         if (addr1->sa.sa_family != addr2->sa.sa_family)
317                 return 0;
318         if (addr1->v4.sin_port != addr2->v4.sin_port)
319                 return 0;
320         if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
321                 return 0;
322 
323         return 1;
324 }
325 
326 /* Initialize addr struct to INADDR_ANY. */
327 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
328 {
329         addr->v4.sin_family = AF_INET;
330         addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
331         addr->v4.sin_port = port;
332 }
333 
334 /* Is this a wildcard address? */
335 static int sctp_v4_is_any(const union sctp_addr *addr)
336 {
337         return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
338 }
339 
340 /* This function checks if the address is a valid address to be used for
341  * SCTP binding.
342  *
343  * Output:
344  * Return 0 - If the address is a non-unicast or an illegal address.
345  * Return 1 - If the address is a unicast.
346  */
347 static int sctp_v4_addr_valid(union sctp_addr *addr,
348                               struct sctp_sock *sp,
349                               const struct sk_buff *skb)
350 {
351         /* IPv4 addresses not allowed */
352         if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
353                 return 0;
354 
355         /* Is this a non-unicast address or a unusable SCTP address? */
356         if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
357                 return 0;
358 
359         /* Is this a broadcast address? */
360         if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
361                 return 0;
362 
363         return 1;
364 }
365 
366 /* Should this be available for binding?   */
367 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
368 {
369         struct net *net = sock_net(&sp->inet.sk);
370         int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
371 
372 
373         if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
374            ret != RTN_LOCAL &&
375            !sp->inet.freebind &&
376            !sysctl_ip_nonlocal_bind)
377                 return 0;
378 
379         if (ipv6_only_sock(sctp_opt2sk(sp)))
380                 return 0;
381 
382         return 1;
383 }
384 
385 /* Checking the loopback, private and other address scopes as defined in
386  * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
387  * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
388  *
389  * Level 0 - unusable SCTP addresses
390  * Level 1 - loopback address
391  * Level 2 - link-local addresses
392  * Level 3 - private addresses.
393  * Level 4 - global addresses
394  * For INIT and INIT-ACK address list, let L be the level of
395  * of requested destination address, sender and receiver
396  * SHOULD include all of its addresses with level greater
397  * than or equal to L.
398  *
399  * IPv4 scoping can be controlled through sysctl option
400  * net.sctp.addr_scope_policy
401  */
402 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
403 {
404         sctp_scope_t retval;
405 
406         /* Check for unusable SCTP addresses. */
407         if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
408                 retval =  SCTP_SCOPE_UNUSABLE;
409         } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
410                 retval = SCTP_SCOPE_LOOPBACK;
411         } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
412                 retval = SCTP_SCOPE_LINK;
413         } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
414                    ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
415                    ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
416                 retval = SCTP_SCOPE_PRIVATE;
417         } else {
418                 retval = SCTP_SCOPE_GLOBAL;
419         }
420 
421         return retval;
422 }
423 
424 /* Returns a valid dst cache entry for the given source and destination ip
425  * addresses. If an association is passed, trys to get a dst entry with a
426  * source address that matches an address in the bind address list.
427  */
428 static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
429                                 struct flowi *fl, struct sock *sk)
430 {
431         struct sctp_association *asoc = t->asoc;
432         struct rtable *rt;
433         struct flowi4 *fl4 = &fl->u.ip4;
434         struct sctp_bind_addr *bp;
435         struct sctp_sockaddr_entry *laddr;
436         struct dst_entry *dst = NULL;
437         union sctp_addr *daddr = &t->ipaddr;
438         union sctp_addr dst_saddr;
439 
440         memset(fl4, 0x0, sizeof(struct flowi4));
441         fl4->daddr  = daddr->v4.sin_addr.s_addr;
442         fl4->fl4_dport = daddr->v4.sin_port;
443         fl4->flowi4_proto = IPPROTO_SCTP;
444         if (asoc) {
445                 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
446                 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
447                 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
448         }
449         if (saddr) {
450                 fl4->saddr = saddr->v4.sin_addr.s_addr;
451                 fl4->fl4_sport = saddr->v4.sin_port;
452         }
453 
454         SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ",
455                           __func__, &fl4->daddr, &fl4->saddr);
456 
457         rt = ip_route_output_key(sock_net(sk), fl4);
458         if (!IS_ERR(rt))
459                 dst = &rt->dst;
460 
461         /* If there is no association or if a source address is passed, no
462          * more validation is required.
463          */
464         if (!asoc || saddr)
465                 goto out;
466 
467         bp = &asoc->base.bind_addr;
468 
469         if (dst) {
470                 /* Walk through the bind address list and look for a bind
471                  * address that matches the source address of the returned dst.
472                  */
473                 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
474                 rcu_read_lock();
475                 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
476                         if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
477                             (laddr->state != SCTP_ADDR_SRC &&
478                             !asoc->src_out_of_asoc_ok))
479                                 continue;
480                         if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
481                                 goto out_unlock;
482                 }
483                 rcu_read_unlock();
484 
485                 /* None of the bound addresses match the source address of the
486                  * dst. So release it.
487                  */
488                 dst_release(dst);
489                 dst = NULL;
490         }
491 
492         /* Walk through the bind address list and try to get a dst that
493          * matches a bind address as the source address.
494          */
495         rcu_read_lock();
496         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
497                 if (!laddr->valid)
498                         continue;
499                 if ((laddr->state == SCTP_ADDR_SRC) &&
500                     (AF_INET == laddr->a.sa.sa_family)) {
501                         fl4->fl4_sport = laddr->a.v4.sin_port;
502                         flowi4_update_output(fl4,
503                                              asoc->base.sk->sk_bound_dev_if,
504                                              RT_CONN_FLAGS(asoc->base.sk),
505                                              daddr->v4.sin_addr.s_addr,
506                                              laddr->a.v4.sin_addr.s_addr);
507 
508                         rt = ip_route_output_key(sock_net(sk), fl4);
509                         if (!IS_ERR(rt)) {
510                                 dst = &rt->dst;
511                                 goto out_unlock;
512                         }
513                 }
514         }
515 
516 out_unlock:
517         rcu_read_unlock();
518 out:
519         t->dst = dst;
520         if (dst)
521                 SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n",
522                                   &fl4->daddr, &fl4->saddr);
523         else
524                 SCTP_DEBUG_PRINTK("NO ROUTE\n");
525 }
526 
527 /* For v4, the source address is cached in the route entry(dst). So no need
528  * to cache it separately and hence this is an empty routine.
529  */
530 static void sctp_v4_get_saddr(struct sctp_sock *sk,
531                               struct sctp_transport *t,
532                               struct flowi *fl)
533 {
534         union sctp_addr *saddr = &t->saddr;
535         struct rtable *rt = (struct rtable *)t->dst;
536 
537         if (rt) {
538                 saddr->v4.sin_family = AF_INET;
539                 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
540         }
541 }
542 
543 /* What interface did this skb arrive on? */
544 static int sctp_v4_skb_iif(const struct sk_buff *skb)
545 {
546         return inet_iif(skb);
547 }
548 
549 /* Was this packet marked by Explicit Congestion Notification? */
550 static int sctp_v4_is_ce(const struct sk_buff *skb)
551 {
552         return INET_ECN_is_ce(ip_hdr(skb)->tos);
553 }
554 
555 /* Create and initialize a new sk for the socket returned by accept(). */
556 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
557                                              struct sctp_association *asoc)
558 {
559         struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
560                         sk->sk_prot);
561         struct inet_sock *newinet;
562 
563         if (!newsk)
564                 goto out;
565 
566         sock_init_data(NULL, newsk);
567 
568         sctp_copy_sock(newsk, sk, asoc);
569         sock_reset_flag(newsk, SOCK_ZAPPED);
570 
571         newinet = inet_sk(newsk);
572 
573         newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
574 
575         sk_refcnt_debug_inc(newsk);
576 
577         if (newsk->sk_prot->init(newsk)) {
578                 sk_common_release(newsk);
579                 newsk = NULL;
580         }
581 
582 out:
583         return newsk;
584 }
585 
586 /* Map address, empty for v4 family */
587 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
588 {
589         /* Empty */
590 }
591 
592 /* Dump the v4 addr to the seq file. */
593 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
594 {
595         seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
596 }
597 
598 static void sctp_v4_ecn_capable(struct sock *sk)
599 {
600         INET_ECN_xmit(sk);
601 }
602 
603 static void sctp_addr_wq_timeout_handler(unsigned long arg)
604 {
605         struct net *net = (struct net *)arg;
606         struct sctp_sockaddr_entry *addrw, *temp;
607         struct sctp_sock *sp;
608 
609         spin_lock_bh(&net->sctp.addr_wq_lock);
610 
611         list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
612                 SCTP_DEBUG_PRINTK_IPADDR("sctp_addrwq_timo_handler: the first ent in wq %p is ",
613                     " for cmd %d at entry %p\n", &net->sctp.addr_waitq, &addrw->a, addrw->state,
614                     addrw);
615 
616 #if IS_ENABLED(CONFIG_IPV6)
617                 /* Now we send an ASCONF for each association */
618                 /* Note. we currently don't handle link local IPv6 addressees */
619                 if (addrw->a.sa.sa_family == AF_INET6) {
620                         struct in6_addr *in6;
621 
622                         if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
623                             IPV6_ADDR_LINKLOCAL)
624                                 goto free_next;
625 
626                         in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
627                         if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
628                             addrw->state == SCTP_ADDR_NEW) {
629                                 unsigned long timeo_val;
630 
631                                 SCTP_DEBUG_PRINTK("sctp_timo_handler: this is on DAD, trying %d sec later\n",
632                                     SCTP_ADDRESS_TICK_DELAY);
633                                 timeo_val = jiffies;
634                                 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
635                                 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
636                                 break;
637                         }
638                 }
639 #endif
640                 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
641                         struct sock *sk;
642 
643                         sk = sctp_opt2sk(sp);
644                         /* ignore bound-specific endpoints */
645                         if (!sctp_is_ep_boundall(sk))
646                                 continue;
647                         sctp_bh_lock_sock(sk);
648                         if (sctp_asconf_mgmt(sp, addrw) < 0)
649                                 SCTP_DEBUG_PRINTK("sctp_addrwq_timo_handler: sctp_asconf_mgmt failed\n");
650                         sctp_bh_unlock_sock(sk);
651                 }
652 #if IS_ENABLED(CONFIG_IPV6)
653 free_next:
654 #endif
655                 list_del(&addrw->list);
656                 kfree(addrw);
657         }
658         spin_unlock_bh(&net->sctp.addr_wq_lock);
659 }
660 
661 static void sctp_free_addr_wq(struct net *net)
662 {
663         struct sctp_sockaddr_entry *addrw;
664         struct sctp_sockaddr_entry *temp;
665 
666         spin_lock_bh(&net->sctp.addr_wq_lock);
667         del_timer(&net->sctp.addr_wq_timer);
668         list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
669                 list_del(&addrw->list);
670                 kfree(addrw);
671         }
672         spin_unlock_bh(&net->sctp.addr_wq_lock);
673 }
674 
675 /* lookup the entry for the same address in the addr_waitq
676  * sctp_addr_wq MUST be locked
677  */
678 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
679                                         struct sctp_sockaddr_entry *addr)
680 {
681         struct sctp_sockaddr_entry *addrw;
682 
683         list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
684                 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
685                         continue;
686                 if (addrw->a.sa.sa_family == AF_INET) {
687                         if (addrw->a.v4.sin_addr.s_addr ==
688                             addr->a.v4.sin_addr.s_addr)
689                                 return addrw;
690                 } else if (addrw->a.sa.sa_family == AF_INET6) {
691                         if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
692                             &addr->a.v6.sin6_addr))
693                                 return addrw;
694                 }
695         }
696         return NULL;
697 }
698 
699 void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
700 {
701         struct sctp_sockaddr_entry *addrw;
702         unsigned long timeo_val;
703 
704         /* first, we check if an opposite message already exist in the queue.
705          * If we found such message, it is removed.
706          * This operation is a bit stupid, but the DHCP client attaches the
707          * new address after a couple of addition and deletion of that address
708          */
709 
710         spin_lock_bh(&net->sctp.addr_wq_lock);
711         /* Offsets existing events in addr_wq */
712         addrw = sctp_addr_wq_lookup(net, addr);
713         if (addrw) {
714                 if (addrw->state != cmd) {
715                         SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt offsets existing entry for %d ",
716                             " in wq %p\n", addrw->state, &addrw->a,
717                             &net->sctp.addr_waitq);
718                         list_del(&addrw->list);
719                         kfree(addrw);
720                 }
721                 spin_unlock_bh(&net->sctp.addr_wq_lock);
722                 return;
723         }
724 
725         /* OK, we have to add the new address to the wait queue */
726         addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
727         if (addrw == NULL) {
728                 spin_unlock_bh(&net->sctp.addr_wq_lock);
729                 return;
730         }
731         addrw->state = cmd;
732         list_add_tail(&addrw->list, &net->sctp.addr_waitq);
733         SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt add new entry for cmd:%d ",
734             " in wq %p\n", addrw->state, &addrw->a, &net->sctp.addr_waitq);
735 
736         if (!timer_pending(&net->sctp.addr_wq_timer)) {
737                 timeo_val = jiffies;
738                 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
739                 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
740         }
741         spin_unlock_bh(&net->sctp.addr_wq_lock);
742 }
743 
744 /* Event handler for inet address addition/deletion events.
745  * The sctp_local_addr_list needs to be protocted by a spin lock since
746  * multiple notifiers (say IPv4 and IPv6) may be running at the same
747  * time and thus corrupt the list.
748  * The reader side is protected with RCU.
749  */
750 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
751                                void *ptr)
752 {
753         struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
754         struct sctp_sockaddr_entry *addr = NULL;
755         struct sctp_sockaddr_entry *temp;
756         struct net *net = dev_net(ifa->ifa_dev->dev);
757         int found = 0;
758 
759         switch (ev) {
760         case NETDEV_UP:
761                 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
762                 if (addr) {
763                         addr->a.v4.sin_family = AF_INET;
764                         addr->a.v4.sin_port = 0;
765                         addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
766                         addr->valid = 1;
767                         spin_lock_bh(&net->sctp.local_addr_lock);
768                         list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
769                         sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
770                         spin_unlock_bh(&net->sctp.local_addr_lock);
771                 }
772                 break;
773         case NETDEV_DOWN:
774                 spin_lock_bh(&net->sctp.local_addr_lock);
775                 list_for_each_entry_safe(addr, temp,
776                                         &net->sctp.local_addr_list, list) {
777                         if (addr->a.sa.sa_family == AF_INET &&
778                                         addr->a.v4.sin_addr.s_addr ==
779                                         ifa->ifa_local) {
780                                 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
781                                 found = 1;
782                                 addr->valid = 0;
783                                 list_del_rcu(&addr->list);
784                                 break;
785                         }
786                 }
787                 spin_unlock_bh(&net->sctp.local_addr_lock);
788                 if (found)
789                         kfree_rcu(addr, rcu);
790                 break;
791         }
792 
793         return NOTIFY_DONE;
794 }
795 
796 /*
797  * Initialize the control inode/socket with a control endpoint data
798  * structure.  This endpoint is reserved exclusively for the OOTB processing.
799  */
800 static int sctp_ctl_sock_init(struct net *net)
801 {
802         int err;
803         sa_family_t family = PF_INET;
804 
805         if (sctp_get_pf_specific(PF_INET6))
806                 family = PF_INET6;
807 
808         err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
809                                    SOCK_SEQPACKET, IPPROTO_SCTP, net);
810 
811         /* If IPv6 socket could not be created, try the IPv4 socket */
812         if (err < 0 && family == PF_INET6)
813                 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
814                                            SOCK_SEQPACKET, IPPROTO_SCTP,
815                                            net);
816 
817         if (err < 0) {
818                 pr_err("Failed to create the SCTP control socket\n");
819                 return err;
820         }
821         return 0;
822 }
823 
824 /* Register address family specific functions. */
825 int sctp_register_af(struct sctp_af *af)
826 {
827         switch (af->sa_family) {
828         case AF_INET:
829                 if (sctp_af_v4_specific)
830                         return 0;
831                 sctp_af_v4_specific = af;
832                 break;
833         case AF_INET6:
834                 if (sctp_af_v6_specific)
835                         return 0;
836                 sctp_af_v6_specific = af;
837                 break;
838         default:
839                 return 0;
840         }
841 
842         INIT_LIST_HEAD(&af->list);
843         list_add_tail(&af->list, &sctp_address_families);
844         return 1;
845 }
846 
847 /* Get the table of functions for manipulating a particular address
848  * family.
849  */
850 struct sctp_af *sctp_get_af_specific(sa_family_t family)
851 {
852         switch (family) {
853         case AF_INET:
854                 return sctp_af_v4_specific;
855         case AF_INET6:
856                 return sctp_af_v6_specific;
857         default:
858                 return NULL;
859         }
860 }
861 
862 /* Common code to initialize a AF_INET msg_name. */
863 static void sctp_inet_msgname(char *msgname, int *addr_len)
864 {
865         struct sockaddr_in *sin;
866 
867         sin = (struct sockaddr_in *)msgname;
868         *addr_len = sizeof(struct sockaddr_in);
869         sin->sin_family = AF_INET;
870         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
871 }
872 
873 /* Copy the primary address of the peer primary address as the msg_name. */
874 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
875                                     int *addr_len)
876 {
877         struct sockaddr_in *sin, *sinfrom;
878 
879         if (msgname) {
880                 struct sctp_association *asoc;
881 
882                 asoc = event->asoc;
883                 sctp_inet_msgname(msgname, addr_len);
884                 sin = (struct sockaddr_in *)msgname;
885                 sinfrom = &asoc->peer.primary_addr.v4;
886                 sin->sin_port = htons(asoc->peer.port);
887                 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
888         }
889 }
890 
891 /* Initialize and copy out a msgname from an inbound skb. */
892 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
893 {
894         if (msgname) {
895                 struct sctphdr *sh = sctp_hdr(skb);
896                 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
897 
898                 sctp_inet_msgname(msgname, len);
899                 sin->sin_port = sh->source;
900                 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
901         }
902 }
903 
904 /* Do we support this AF? */
905 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
906 {
907         /* PF_INET only supports AF_INET addresses. */
908         return AF_INET == family;
909 }
910 
911 /* Address matching with wildcards allowed. */
912 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
913                               const union sctp_addr *addr2,
914                               struct sctp_sock *opt)
915 {
916         /* PF_INET only supports AF_INET addresses. */
917         if (addr1->sa.sa_family != addr2->sa.sa_family)
918                 return 0;
919         if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
920             htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
921                 return 1;
922         if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
923                 return 1;
924 
925         return 0;
926 }
927 
928 /* Verify that provided sockaddr looks bindable.  Common verification has
929  * already been taken care of.
930  */
931 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
932 {
933         return sctp_v4_available(addr, opt);
934 }
935 
936 /* Verify that sockaddr looks sendable.  Common verification has already
937  * been taken care of.
938  */
939 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
940 {
941         return 1;
942 }
943 
944 /* Fill in Supported Address Type information for INIT and INIT-ACK
945  * chunks.  Returns number of addresses supported.
946  */
947 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
948                                      __be16 *types)
949 {
950         types[0] = SCTP_PARAM_IPV4_ADDRESS;
951         return 1;
952 }
953 
954 /* Wrapper routine that calls the ip transmit routine. */
955 static inline int sctp_v4_xmit(struct sk_buff *skb,
956                                struct sctp_transport *transport)
957 {
958         struct inet_sock *inet = inet_sk(skb->sk);
959 
960         SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n",
961                           __func__, skb, skb->len,
962                           &transport->fl.u.ip4.saddr,
963                           &transport->fl.u.ip4.daddr);
964 
965         inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
966                          IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
967 
968         SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
969         return ip_queue_xmit(skb, &transport->fl);
970 }
971 
972 static struct sctp_af sctp_af_inet;
973 
974 static struct sctp_pf sctp_pf_inet = {
975         .event_msgname = sctp_inet_event_msgname,
976         .skb_msgname   = sctp_inet_skb_msgname,
977         .af_supported  = sctp_inet_af_supported,
978         .cmp_addr      = sctp_inet_cmp_addr,
979         .bind_verify   = sctp_inet_bind_verify,
980         .send_verify   = sctp_inet_send_verify,
981         .supported_addrs = sctp_inet_supported_addrs,
982         .create_accept_sk = sctp_v4_create_accept_sk,
983         .addr_v4map     = sctp_v4_addr_v4map,
984         .af            = &sctp_af_inet
985 };
986 
987 /* Notifier for inetaddr addition/deletion events.  */
988 static struct notifier_block sctp_inetaddr_notifier = {
989         .notifier_call = sctp_inetaddr_event,
990 };
991 
992 /* Socket operations.  */
993 static const struct proto_ops inet_seqpacket_ops = {
994         .family            = PF_INET,
995         .owner             = THIS_MODULE,
996         .release           = inet_release,      /* Needs to be wrapped... */
997         .bind              = inet_bind,
998         .connect           = inet_dgram_connect,
999         .socketpair        = sock_no_socketpair,
1000         .accept            = inet_accept,
1001         .getname           = inet_getname,      /* Semantics are different.  */
1002         .poll              = sctp_poll,
1003         .ioctl             = inet_ioctl,
1004         .listen            = sctp_inet_listen,
1005         .shutdown          = inet_shutdown,     /* Looks harmless.  */
1006         .setsockopt        = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1007         .getsockopt        = sock_common_getsockopt,
1008         .sendmsg           = inet_sendmsg,
1009         .recvmsg           = sock_common_recvmsg,
1010         .mmap              = sock_no_mmap,
1011         .sendpage          = sock_no_sendpage,
1012 #ifdef CONFIG_COMPAT
1013         .compat_setsockopt = compat_sock_common_setsockopt,
1014         .compat_getsockopt = compat_sock_common_getsockopt,
1015 #endif
1016 };
1017 
1018 /* Registration with AF_INET family.  */
1019 static struct inet_protosw sctp_seqpacket_protosw = {
1020         .type       = SOCK_SEQPACKET,
1021         .protocol   = IPPROTO_SCTP,
1022         .prot       = &sctp_prot,
1023         .ops        = &inet_seqpacket_ops,
1024         .no_check   = 0,
1025         .flags      = SCTP_PROTOSW_FLAG
1026 };
1027 static struct inet_protosw sctp_stream_protosw = {
1028         .type       = SOCK_STREAM,
1029         .protocol   = IPPROTO_SCTP,
1030         .prot       = &sctp_prot,
1031         .ops        = &inet_seqpacket_ops,
1032         .no_check   = 0,
1033         .flags      = SCTP_PROTOSW_FLAG
1034 };
1035 
1036 /* Register with IP layer.  */
1037 static const struct net_protocol sctp_protocol = {
1038         .handler     = sctp_rcv,
1039         .err_handler = sctp_v4_err,
1040         .no_policy   = 1,
1041         .netns_ok    = 1,
1042 };
1043 
1044 /* IPv4 address related functions.  */
1045 static struct sctp_af sctp_af_inet = {
1046         .sa_family         = AF_INET,
1047         .sctp_xmit         = sctp_v4_xmit,
1048         .setsockopt        = ip_setsockopt,
1049         .getsockopt        = ip_getsockopt,
1050         .get_dst           = sctp_v4_get_dst,
1051         .get_saddr         = sctp_v4_get_saddr,
1052         .copy_addrlist     = sctp_v4_copy_addrlist,
1053         .from_skb          = sctp_v4_from_skb,
1054         .from_sk           = sctp_v4_from_sk,
1055         .to_sk_saddr       = sctp_v4_to_sk_saddr,
1056         .to_sk_daddr       = sctp_v4_to_sk_daddr,
1057         .from_addr_param   = sctp_v4_from_addr_param,
1058         .to_addr_param     = sctp_v4_to_addr_param,
1059         .cmp_addr          = sctp_v4_cmp_addr,
1060         .addr_valid        = sctp_v4_addr_valid,
1061         .inaddr_any        = sctp_v4_inaddr_any,
1062         .is_any            = sctp_v4_is_any,
1063         .available         = sctp_v4_available,
1064         .scope             = sctp_v4_scope,
1065         .skb_iif           = sctp_v4_skb_iif,
1066         .is_ce             = sctp_v4_is_ce,
1067         .seq_dump_addr     = sctp_v4_seq_dump_addr,
1068         .ecn_capable       = sctp_v4_ecn_capable,
1069         .net_header_len    = sizeof(struct iphdr),
1070         .sockaddr_len      = sizeof(struct sockaddr_in),
1071 #ifdef CONFIG_COMPAT
1072         .compat_setsockopt = compat_ip_setsockopt,
1073         .compat_getsockopt = compat_ip_getsockopt,
1074 #endif
1075 };
1076 
1077 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
1078 
1079         switch (family) {
1080         case PF_INET:
1081                 return sctp_pf_inet_specific;
1082         case PF_INET6:
1083                 return sctp_pf_inet6_specific;
1084         default:
1085                 return NULL;
1086         }
1087 }
1088 
1089 /* Register the PF specific function table.  */
1090 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1091 {
1092         switch (family) {
1093         case PF_INET:
1094                 if (sctp_pf_inet_specific)
1095                         return 0;
1096                 sctp_pf_inet_specific = pf;
1097                 break;
1098         case PF_INET6:
1099                 if (sctp_pf_inet6_specific)
1100                         return 0;
1101                 sctp_pf_inet6_specific = pf;
1102                 break;
1103         default:
1104                 return 0;
1105         }
1106         return 1;
1107 }
1108 
1109 static inline int init_sctp_mibs(struct net *net)
1110 {
1111         return snmp_mib_init((void __percpu **)net->sctp.sctp_statistics,
1112                              sizeof(struct sctp_mib),
1113                              __alignof__(struct sctp_mib));
1114 }
1115 
1116 static inline void cleanup_sctp_mibs(struct net *net)
1117 {
1118         snmp_mib_free((void __percpu **)net->sctp.sctp_statistics);
1119 }
1120 
1121 static void sctp_v4_pf_init(void)
1122 {
1123         /* Initialize the SCTP specific PF functions. */
1124         sctp_register_pf(&sctp_pf_inet, PF_INET);
1125         sctp_register_af(&sctp_af_inet);
1126 }
1127 
1128 static void sctp_v4_pf_exit(void)
1129 {
1130         list_del(&sctp_af_inet.list);
1131 }
1132 
1133 static int sctp_v4_protosw_init(void)
1134 {
1135         int rc;
1136 
1137         rc = proto_register(&sctp_prot, 1);
1138         if (rc)
1139                 return rc;
1140 
1141         /* Register SCTP(UDP and TCP style) with socket layer.  */
1142         inet_register_protosw(&sctp_seqpacket_protosw);
1143         inet_register_protosw(&sctp_stream_protosw);
1144 
1145         return 0;
1146 }
1147 
1148 static void sctp_v4_protosw_exit(void)
1149 {
1150         inet_unregister_protosw(&sctp_stream_protosw);
1151         inet_unregister_protosw(&sctp_seqpacket_protosw);
1152         proto_unregister(&sctp_prot);
1153 }
1154 
1155 static int sctp_v4_add_protocol(void)
1156 {
1157         /* Register notifier for inet address additions/deletions. */
1158         register_inetaddr_notifier(&sctp_inetaddr_notifier);
1159 
1160         /* Register SCTP with inet layer.  */
1161         if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1162                 return -EAGAIN;
1163 
1164         return 0;
1165 }
1166 
1167 static void sctp_v4_del_protocol(void)
1168 {
1169         inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1170         unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1171 }
1172 
1173 static int __net_init sctp_defaults_init(struct net *net)
1174 {
1175         int status;
1176 
1177         /*
1178          * 14. Suggested SCTP Protocol Parameter Values
1179          */
1180         /* The following protocol parameters are RECOMMENDED:  */
1181         /* RTO.Initial              - 3  seconds */
1182         net->sctp.rto_initial                   = SCTP_RTO_INITIAL;
1183         /* RTO.Min                  - 1  second */
1184         net->sctp.rto_min                       = SCTP_RTO_MIN;
1185         /* RTO.Max                 -  60 seconds */
1186         net->sctp.rto_max                       = SCTP_RTO_MAX;
1187         /* RTO.Alpha                - 1/8 */
1188         net->sctp.rto_alpha                     = SCTP_RTO_ALPHA;
1189         /* RTO.Beta                 - 1/4 */
1190         net->sctp.rto_beta                      = SCTP_RTO_BETA;
1191 
1192         /* Valid.Cookie.Life        - 60  seconds */
1193         net->sctp.valid_cookie_life             = SCTP_DEFAULT_COOKIE_LIFE;
1194 
1195         /* Whether Cookie Preservative is enabled(1) or not(0) */
1196         net->sctp.cookie_preserve_enable        = 1;
1197 
1198         /* Default sctp sockets to use md5 as their hmac alg */
1199 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1200         net->sctp.sctp_hmac_alg                 = "md5";
1201 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1202         net->sctp.sctp_hmac_alg                 = "sha1";
1203 #else
1204         net->sctp.sctp_hmac_alg                 = NULL;
1205 #endif
1206 
1207         /* Max.Burst                - 4 */
1208         net->sctp.max_burst                     = SCTP_DEFAULT_MAX_BURST;
1209 
1210         /* Association.Max.Retrans  - 10 attempts
1211          * Path.Max.Retrans         - 5  attempts (per destination address)
1212          * Max.Init.Retransmits     - 8  attempts
1213          */
1214         net->sctp.max_retrans_association       = 10;
1215         net->sctp.max_retrans_path              = 5;
1216         net->sctp.max_retrans_init              = 8;
1217 
1218         /* Sendbuffer growth        - do per-socket accounting */
1219         net->sctp.sndbuf_policy                 = 0;
1220 
1221         /* Rcvbuffer growth         - do per-socket accounting */
1222         net->sctp.rcvbuf_policy                 = 0;
1223 
1224         /* HB.interval              - 30 seconds */
1225         net->sctp.hb_interval                   = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1226 
1227         /* delayed SACK timeout */
1228         net->sctp.sack_timeout                  = SCTP_DEFAULT_TIMEOUT_SACK;
1229 
1230         /* Disable ADDIP by default. */
1231         net->sctp.addip_enable = 0;
1232         net->sctp.addip_noauth = 0;
1233         net->sctp.default_auto_asconf = 0;
1234 
1235         /* Enable PR-SCTP by default. */
1236         net->sctp.prsctp_enable = 1;
1237 
1238         /* Disable AUTH by default. */
1239         net->sctp.auth_enable = 0;
1240 
1241         /* Set SCOPE policy to enabled */
1242         net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1243 
1244         /* Set the default rwnd update threshold */
1245         net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1246 
1247         /* Initialize maximum autoclose timeout. */
1248         net->sctp.max_autoclose         = INT_MAX / HZ;
1249 
1250         status = sctp_sysctl_net_register(net);
1251         if (status)
1252                 goto err_sysctl_register;
1253 
1254         /* Allocate and initialise sctp mibs.  */
1255         status = init_sctp_mibs(net);
1256         if (status)
1257                 goto err_init_mibs;
1258 
1259         /* Initialize proc fs directory.  */
1260         status = sctp_proc_init(net);
1261         if (status)
1262                 goto err_init_proc;
1263 
1264         sctp_dbg_objcnt_init(net);
1265 
1266         /* Initialize the local address list. */
1267         INIT_LIST_HEAD(&net->sctp.local_addr_list);
1268         spin_lock_init(&net->sctp.local_addr_lock);
1269         sctp_get_local_addr_list(net);
1270 
1271         /* Initialize the address event list */
1272         INIT_LIST_HEAD(&net->sctp.addr_waitq);
1273         INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1274         spin_lock_init(&net->sctp.addr_wq_lock);
1275         net->sctp.addr_wq_timer.expires = 0;
1276         setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler,
1277                     (unsigned long)net);
1278 
1279         return 0;
1280 
1281 err_init_proc:
1282         cleanup_sctp_mibs(net);
1283 err_init_mibs:
1284         sctp_sysctl_net_unregister(net);
1285 err_sysctl_register:
1286         return status;
1287 }
1288 
1289 static void __net_exit sctp_defaults_exit(struct net *net)
1290 {
1291         /* Free the local address list */
1292         sctp_free_addr_wq(net);
1293         sctp_free_local_addr_list(net);
1294 
1295         sctp_dbg_objcnt_exit(net);
1296 
1297         sctp_proc_exit(net);
1298         cleanup_sctp_mibs(net);
1299         sctp_sysctl_net_unregister(net);
1300 }
1301 
1302 static struct pernet_operations sctp_defaults_ops = {
1303         .init = sctp_defaults_init,
1304         .exit = sctp_defaults_exit,
1305 };
1306 
1307 static int __net_init sctp_ctrlsock_init(struct net *net)
1308 {
1309         int status;
1310 
1311         /* Initialize the control inode/socket for handling OOTB packets.  */
1312         status = sctp_ctl_sock_init(net);
1313         if (status)
1314                 pr_err("Failed to initialize the SCTP control sock\n");
1315 
1316         return status;
1317 }
1318 
1319 static void __net_init sctp_ctrlsock_exit(struct net *net)
1320 {
1321         /* Free the control endpoint.  */
1322         inet_ctl_sock_destroy(net->sctp.ctl_sock);
1323 }
1324 
1325 static struct pernet_operations sctp_ctrlsock_ops = {
1326         .init = sctp_ctrlsock_init,
1327         .exit = sctp_ctrlsock_exit,
1328 };
1329 
1330 /* Initialize the universe into something sensible.  */
1331 SCTP_STATIC __init int sctp_init(void)
1332 {
1333         int i;
1334         int status = -EINVAL;
1335         unsigned long goal;
1336         unsigned long limit;
1337         int max_share;
1338         int order;
1339 
1340         /* SCTP_DEBUG sanity check. */
1341         if (!sctp_sanity_check())
1342                 goto out;
1343 
1344         /* Allocate bind_bucket and chunk caches. */
1345         status = -ENOBUFS;
1346         sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1347                                                sizeof(struct sctp_bind_bucket),
1348                                                0, SLAB_HWCACHE_ALIGN,
1349                                                NULL);
1350         if (!sctp_bucket_cachep)
1351                 goto out;
1352 
1353         sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1354                                                sizeof(struct sctp_chunk),
1355                                                0, SLAB_HWCACHE_ALIGN,
1356                                                NULL);
1357         if (!sctp_chunk_cachep)
1358                 goto err_chunk_cachep;
1359 
1360         status = percpu_counter_init(&sctp_sockets_allocated, 0);
1361         if (status)
1362                 goto err_percpu_counter_init;
1363 
1364         /* Implementation specific variables. */
1365 
1366         /* Initialize default stream count setup information. */
1367         sctp_max_instreams              = SCTP_DEFAULT_INSTREAMS;
1368         sctp_max_outstreams             = SCTP_DEFAULT_OUTSTREAMS;
1369 
1370         /* Initialize handle used for association ids. */
1371         idr_init(&sctp_assocs_id);
1372 
1373         limit = nr_free_buffer_pages() / 8;
1374         limit = max(limit, 128UL);
1375         sysctl_sctp_mem[0] = limit / 4 * 3;
1376         sysctl_sctp_mem[1] = limit;
1377         sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1378 
1379         /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1380         limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1381         max_share = min(4UL*1024*1024, limit);
1382 
1383         sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1384         sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1385         sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1386 
1387         sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1388         sysctl_sctp_wmem[1] = 16*1024;
1389         sysctl_sctp_wmem[2] = max(64*1024, max_share);
1390 
1391         /* Size and allocate the association hash table.
1392          * The methodology is similar to that of the tcp hash tables.
1393          */
1394         if (totalram_pages >= (128 * 1024))
1395                 goal = totalram_pages >> (22 - PAGE_SHIFT);
1396         else
1397                 goal = totalram_pages >> (24 - PAGE_SHIFT);
1398 
1399         for (order = 0; (1UL << order) < goal; order++)
1400                 ;
1401 
1402         do {
1403                 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1404                                         sizeof(struct sctp_hashbucket);
1405                 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1406                         continue;
1407                 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1408                         __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1409         } while (!sctp_assoc_hashtable && --order > 0);
1410         if (!sctp_assoc_hashtable) {
1411                 pr_err("Failed association hash alloc\n");
1412                 status = -ENOMEM;
1413                 goto err_ahash_alloc;
1414         }
1415         for (i = 0; i < sctp_assoc_hashsize; i++) {
1416                 rwlock_init(&sctp_assoc_hashtable[i].lock);
1417                 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
1418         }
1419 
1420         /* Allocate and initialize the endpoint hash table.  */
1421         sctp_ep_hashsize = 64;
1422         sctp_ep_hashtable =
1423                 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1424         if (!sctp_ep_hashtable) {
1425                 pr_err("Failed endpoint_hash alloc\n");
1426                 status = -ENOMEM;
1427                 goto err_ehash_alloc;
1428         }
1429         for (i = 0; i < sctp_ep_hashsize; i++) {
1430                 rwlock_init(&sctp_ep_hashtable[i].lock);
1431                 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1432         }
1433 
1434         /* Allocate and initialize the SCTP port hash table.  */
1435         do {
1436                 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1437                                         sizeof(struct sctp_bind_hashbucket);
1438                 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1439                         continue;
1440                 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1441                         __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1442         } while (!sctp_port_hashtable && --order > 0);
1443         if (!sctp_port_hashtable) {
1444                 pr_err("Failed bind hash alloc\n");
1445                 status = -ENOMEM;
1446                 goto err_bhash_alloc;
1447         }
1448         for (i = 0; i < sctp_port_hashsize; i++) {
1449                 spin_lock_init(&sctp_port_hashtable[i].lock);
1450                 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1451         }
1452 
1453         pr_info("Hash tables configured (established %d bind %d)\n",
1454                 sctp_assoc_hashsize, sctp_port_hashsize);
1455 
1456         sctp_sysctl_register();
1457 
1458         INIT_LIST_HEAD(&sctp_address_families);
1459         sctp_v4_pf_init();
1460         sctp_v6_pf_init();
1461 
1462         status = register_pernet_subsys(&sctp_defaults_ops);
1463         if (status)
1464                 goto err_register_defaults;
1465 
1466         status = sctp_v4_protosw_init();
1467         if (status)
1468                 goto err_protosw_init;
1469 
1470         status = sctp_v6_protosw_init();
1471         if (status)
1472                 goto err_v6_protosw_init;
1473 
1474         status = register_pernet_subsys(&sctp_ctrlsock_ops);
1475         if (status)
1476                 goto err_register_ctrlsock;
1477 
1478         status = sctp_v4_add_protocol();
1479         if (status)
1480                 goto err_add_protocol;
1481 
1482         /* Register SCTP with inet6 layer.  */
1483         status = sctp_v6_add_protocol();
1484         if (status)
1485                 goto err_v6_add_protocol;
1486 
1487         status = 0;
1488 out:
1489         return status;
1490 err_v6_add_protocol:
1491         sctp_v4_del_protocol();
1492 err_add_protocol:
1493         unregister_pernet_subsys(&sctp_ctrlsock_ops);
1494 err_register_ctrlsock:
1495         sctp_v6_protosw_exit();
1496 err_v6_protosw_init:
1497         sctp_v4_protosw_exit();
1498 err_protosw_init:
1499         unregister_pernet_subsys(&sctp_defaults_ops);
1500 err_register_defaults:
1501         sctp_v4_pf_exit();
1502         sctp_v6_pf_exit();
1503         sctp_sysctl_unregister();
1504         free_pages((unsigned long)sctp_port_hashtable,
1505                    get_order(sctp_port_hashsize *
1506                              sizeof(struct sctp_bind_hashbucket)));
1507 err_bhash_alloc:
1508         kfree(sctp_ep_hashtable);
1509 err_ehash_alloc:
1510         free_pages((unsigned long)sctp_assoc_hashtable,
1511                    get_order(sctp_assoc_hashsize *
1512                              sizeof(struct sctp_hashbucket)));
1513 err_ahash_alloc:
1514         percpu_counter_destroy(&sctp_sockets_allocated);
1515 err_percpu_counter_init:
1516         kmem_cache_destroy(sctp_chunk_cachep);
1517 err_chunk_cachep:
1518         kmem_cache_destroy(sctp_bucket_cachep);
1519         goto out;
1520 }
1521 
1522 /* Exit handler for the SCTP protocol.  */
1523 SCTP_STATIC __exit void sctp_exit(void)
1524 {
1525         /* BUG.  This should probably do something useful like clean
1526          * up all the remaining associations and all that memory.
1527          */
1528 
1529         /* Unregister with inet6/inet layers. */
1530         sctp_v6_del_protocol();
1531         sctp_v4_del_protocol();
1532 
1533         unregister_pernet_subsys(&sctp_ctrlsock_ops);
1534 
1535         /* Free protosw registrations */
1536         sctp_v6_protosw_exit();
1537         sctp_v4_protosw_exit();
1538 
1539         unregister_pernet_subsys(&sctp_defaults_ops);
1540 
1541         /* Unregister with socket layer. */
1542         sctp_v6_pf_exit();
1543         sctp_v4_pf_exit();
1544 
1545         sctp_sysctl_unregister();
1546 
1547         free_pages((unsigned long)sctp_assoc_hashtable,
1548                    get_order(sctp_assoc_hashsize *
1549                              sizeof(struct sctp_hashbucket)));
1550         kfree(sctp_ep_hashtable);
1551         free_pages((unsigned long)sctp_port_hashtable,
1552                    get_order(sctp_port_hashsize *
1553                              sizeof(struct sctp_bind_hashbucket)));
1554 
1555         percpu_counter_destroy(&sctp_sockets_allocated);
1556 
1557         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1558 
1559         kmem_cache_destroy(sctp_chunk_cachep);
1560         kmem_cache_destroy(sctp_bucket_cachep);
1561 }
1562 
1563 module_init(sctp_init);
1564 module_exit(sctp_exit);
1565 
1566 /*
1567  * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1568  */
1569 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1570 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1571 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1572 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1573 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1574 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1575 MODULE_LICENSE("GPL");
1576 

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