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

Version: ~ [ linux-5.14-rc3 ] ~ [ linux-5.13.5 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.53 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.135 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.198 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.240 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.276 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.276 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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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, see
 27  * <http://www.gnu.org/licenses/>.
 28  *
 29  * Please send any bug reports or fixes you make to the
 30  * email address(es):
 31  *    lksctp developers <linux-sctp@vger.kernel.org>
 32  *
 33  * Written or modified by:
 34  *    La Monte H.P. Yarroll <piggy@acm.org>
 35  *    Karl Knutson <karl@athena.chicago.il.us>
 36  *    Jon Grimm <jgrimm@us.ibm.com>
 37  *    Sridhar Samudrala <sri@us.ibm.com>
 38  *    Daisy Chang <daisyc@us.ibm.com>
 39  *    Ardelle Fan <ardelle.fan@intel.com>
 40  */
 41 
 42 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 43 
 44 #include <linux/module.h>
 45 #include <linux/init.h>
 46 #include <linux/netdevice.h>
 47 #include <linux/inetdevice.h>
 48 #include <linux/seq_file.h>
 49 #include <linux/bootmem.h>
 50 #include <linux/highmem.h>
 51 #include <linux/swap.h>
 52 #include <linux/slab.h>
 53 #include <net/net_namespace.h>
 54 #include <net/protocol.h>
 55 #include <net/ip.h>
 56 #include <net/ipv6.h>
 57 #include <net/route.h>
 58 #include <net/sctp/sctp.h>
 59 #include <net/addrconf.h>
 60 #include <net/inet_common.h>
 61 #include <net/inet_ecn.h>
 62 
 63 /* Global data structures. */
 64 struct sctp_globals sctp_globals __read_mostly;
 65 
 66 struct idr sctp_assocs_id;
 67 DEFINE_SPINLOCK(sctp_assocs_id_lock);
 68 
 69 static struct sctp_pf *sctp_pf_inet6_specific;
 70 static struct sctp_pf *sctp_pf_inet_specific;
 71 static struct sctp_af *sctp_af_v4_specific;
 72 static struct sctp_af *sctp_af_v6_specific;
 73 
 74 struct kmem_cache *sctp_chunk_cachep __read_mostly;
 75 struct kmem_cache *sctp_bucket_cachep __read_mostly;
 76 
 77 long sysctl_sctp_mem[3];
 78 int sysctl_sctp_rmem[3];
 79 int sysctl_sctp_wmem[3];
 80 
 81 /* Set up the proc fs entry for the SCTP protocol. */
 82 static int __net_init sctp_proc_init(struct net *net)
 83 {
 84 #ifdef CONFIG_PROC_FS
 85         net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net);
 86         if (!net->sctp.proc_net_sctp)
 87                 goto out_proc_net_sctp;
 88         if (sctp_snmp_proc_init(net))
 89                 goto out_snmp_proc_init;
 90         if (sctp_eps_proc_init(net))
 91                 goto out_eps_proc_init;
 92         if (sctp_assocs_proc_init(net))
 93                 goto out_assocs_proc_init;
 94         if (sctp_remaddr_proc_init(net))
 95                 goto out_remaddr_proc_init;
 96 
 97         return 0;
 98 
 99 out_remaddr_proc_init:
100         sctp_assocs_proc_exit(net);
101 out_assocs_proc_init:
102         sctp_eps_proc_exit(net);
103 out_eps_proc_init:
104         sctp_snmp_proc_exit(net);
105 out_snmp_proc_init:
106         remove_proc_entry("sctp", net->proc_net);
107         net->sctp.proc_net_sctp = NULL;
108 out_proc_net_sctp:
109         return -ENOMEM;
110 #endif /* CONFIG_PROC_FS */
111         return 0;
112 }
113 
114 /* Clean up the proc fs entry for the SCTP protocol.
115  * Note: Do not make this __exit as it is used in the init error
116  * path.
117  */
118 static void sctp_proc_exit(struct net *net)
119 {
120 #ifdef CONFIG_PROC_FS
121         sctp_snmp_proc_exit(net);
122         sctp_eps_proc_exit(net);
123         sctp_assocs_proc_exit(net);
124         sctp_remaddr_proc_exit(net);
125 
126         remove_proc_entry("sctp", net->proc_net);
127         net->sctp.proc_net_sctp = NULL;
128 #endif
129 }
130 
131 /* Private helper to extract ipv4 address and stash them in
132  * the protocol structure.
133  */
134 static void sctp_v4_copy_addrlist(struct list_head *addrlist,
135                                   struct net_device *dev)
136 {
137         struct in_device *in_dev;
138         struct in_ifaddr *ifa;
139         struct sctp_sockaddr_entry *addr;
140 
141         rcu_read_lock();
142         if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
143                 rcu_read_unlock();
144                 return;
145         }
146 
147         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
148                 /* Add the address to the local list.  */
149                 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
150                 if (addr) {
151                         addr->a.v4.sin_family = AF_INET;
152                         addr->a.v4.sin_port = 0;
153                         addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
154                         addr->valid = 1;
155                         INIT_LIST_HEAD(&addr->list);
156                         list_add_tail(&addr->list, addrlist);
157                 }
158         }
159 
160         rcu_read_unlock();
161 }
162 
163 /* Extract our IP addresses from the system and stash them in the
164  * protocol structure.
165  */
166 static void sctp_get_local_addr_list(struct net *net)
167 {
168         struct net_device *dev;
169         struct list_head *pos;
170         struct sctp_af *af;
171 
172         rcu_read_lock();
173         for_each_netdev_rcu(net, dev) {
174                 list_for_each(pos, &sctp_address_families) {
175                         af = list_entry(pos, struct sctp_af, list);
176                         af->copy_addrlist(&net->sctp.local_addr_list, dev);
177                 }
178         }
179         rcu_read_unlock();
180 }
181 
182 /* Free the existing local addresses.  */
183 static void sctp_free_local_addr_list(struct net *net)
184 {
185         struct sctp_sockaddr_entry *addr;
186         struct list_head *pos, *temp;
187 
188         list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
189                 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
190                 list_del(pos);
191                 kfree(addr);
192         }
193 }
194 
195 /* Copy the local addresses which are valid for 'scope' into 'bp'.  */
196 int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
197                               sctp_scope_t scope, gfp_t gfp, int copy_flags)
198 {
199         struct sctp_sockaddr_entry *addr;
200         int error = 0;
201 
202         rcu_read_lock();
203         list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
204                 if (!addr->valid)
205                         continue;
206                 if (sctp_in_scope(net, &addr->a, scope)) {
207                         /* Now that the address is in scope, check to see if
208                          * the address type is really supported by the local
209                          * sock as well as the remote peer.
210                          */
211                         if ((((AF_INET == addr->a.sa.sa_family) &&
212                               (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
213                             (((AF_INET6 == addr->a.sa.sa_family) &&
214                               (copy_flags & SCTP_ADDR6_ALLOWED) &&
215                               (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
216                                 error = sctp_add_bind_addr(bp, &addr->a,
217                                                     SCTP_ADDR_SRC, GFP_ATOMIC);
218                                 if (error)
219                                         goto end_copy;
220                         }
221                 }
222         }
223 
224 end_copy:
225         rcu_read_unlock();
226         return error;
227 }
228 
229 /* Initialize a sctp_addr from in incoming skb.  */
230 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
231                              int is_saddr)
232 {
233         void *from;
234         __be16 *port;
235         struct sctphdr *sh;
236 
237         port = &addr->v4.sin_port;
238         addr->v4.sin_family = AF_INET;
239 
240         sh = sctp_hdr(skb);
241         if (is_saddr) {
242                 *port  = sh->source;
243                 from = &ip_hdr(skb)->saddr;
244         } else {
245                 *port = sh->dest;
246                 from = &ip_hdr(skb)->daddr;
247         }
248         memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
249 }
250 
251 /* Initialize an sctp_addr from a socket. */
252 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
253 {
254         addr->v4.sin_family = AF_INET;
255         addr->v4.sin_port = 0;
256         addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
257 }
258 
259 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
260 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
261 {
262         inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
263 }
264 
265 /* Initialize sk->sk_daddr from sctp_addr. */
266 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
267 {
268         inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
269 }
270 
271 /* Initialize a sctp_addr from an address parameter. */
272 static void sctp_v4_from_addr_param(union sctp_addr *addr,
273                                     union sctp_addr_param *param,
274                                     __be16 port, int iif)
275 {
276         addr->v4.sin_family = AF_INET;
277         addr->v4.sin_port = port;
278         addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
279 }
280 
281 /* Initialize an address parameter from a sctp_addr and return the length
282  * of the address parameter.
283  */
284 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
285                                  union sctp_addr_param *param)
286 {
287         int length = sizeof(sctp_ipv4addr_param_t);
288 
289         param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
290         param->v4.param_hdr.length = htons(length);
291         param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
292 
293         return length;
294 }
295 
296 /* Initialize a sctp_addr from a dst_entry. */
297 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
298                               __be16 port)
299 {
300         saddr->v4.sin_family = AF_INET;
301         saddr->v4.sin_port = port;
302         saddr->v4.sin_addr.s_addr = fl4->saddr;
303 }
304 
305 /* Compare two addresses exactly. */
306 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
307                             const union sctp_addr *addr2)
308 {
309         if (addr1->sa.sa_family != addr2->sa.sa_family)
310                 return 0;
311         if (addr1->v4.sin_port != addr2->v4.sin_port)
312                 return 0;
313         if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
314                 return 0;
315 
316         return 1;
317 }
318 
319 /* Initialize addr struct to INADDR_ANY. */
320 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
321 {
322         addr->v4.sin_family = AF_INET;
323         addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
324         addr->v4.sin_port = port;
325 }
326 
327 /* Is this a wildcard address? */
328 static int sctp_v4_is_any(const union sctp_addr *addr)
329 {
330         return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
331 }
332 
333 /* This function checks if the address is a valid address to be used for
334  * SCTP binding.
335  *
336  * Output:
337  * Return 0 - If the address is a non-unicast or an illegal address.
338  * Return 1 - If the address is a unicast.
339  */
340 static int sctp_v4_addr_valid(union sctp_addr *addr,
341                               struct sctp_sock *sp,
342                               const struct sk_buff *skb)
343 {
344         /* IPv4 addresses not allowed */
345         if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
346                 return 0;
347 
348         /* Is this a non-unicast address or a unusable SCTP address? */
349         if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
350                 return 0;
351 
352         /* Is this a broadcast address? */
353         if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
354                 return 0;
355 
356         return 1;
357 }
358 
359 /* Should this be available for binding?   */
360 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
361 {
362         struct net *net = sock_net(&sp->inet.sk);
363         int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
364 
365 
366         if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
367            ret != RTN_LOCAL &&
368            !sp->inet.freebind &&
369            !net->ipv4.sysctl_ip_nonlocal_bind)
370                 return 0;
371 
372         if (ipv6_only_sock(sctp_opt2sk(sp)))
373                 return 0;
374 
375         return 1;
376 }
377 
378 /* Checking the loopback, private and other address scopes as defined in
379  * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
380  * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
381  *
382  * Level 0 - unusable SCTP addresses
383  * Level 1 - loopback address
384  * Level 2 - link-local addresses
385  * Level 3 - private addresses.
386  * Level 4 - global addresses
387  * For INIT and INIT-ACK address list, let L be the level of
388  * of requested destination address, sender and receiver
389  * SHOULD include all of its addresses with level greater
390  * than or equal to L.
391  *
392  * IPv4 scoping can be controlled through sysctl option
393  * net.sctp.addr_scope_policy
394  */
395 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
396 {
397         sctp_scope_t retval;
398 
399         /* Check for unusable SCTP addresses. */
400         if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
401                 retval =  SCTP_SCOPE_UNUSABLE;
402         } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
403                 retval = SCTP_SCOPE_LOOPBACK;
404         } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
405                 retval = SCTP_SCOPE_LINK;
406         } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
407                    ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
408                    ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
409                 retval = SCTP_SCOPE_PRIVATE;
410         } else {
411                 retval = SCTP_SCOPE_GLOBAL;
412         }
413 
414         return retval;
415 }
416 
417 /* Returns a valid dst cache entry for the given source and destination ip
418  * addresses. If an association is passed, trys to get a dst entry with a
419  * source address that matches an address in the bind address list.
420  */
421 static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
422                                 struct flowi *fl, struct sock *sk)
423 {
424         struct sctp_association *asoc = t->asoc;
425         struct rtable *rt;
426         struct flowi4 *fl4 = &fl->u.ip4;
427         struct sctp_bind_addr *bp;
428         struct sctp_sockaddr_entry *laddr;
429         struct dst_entry *dst = NULL;
430         union sctp_addr *daddr = &t->ipaddr;
431         union sctp_addr dst_saddr;
432 
433         memset(fl4, 0x0, sizeof(struct flowi4));
434         fl4->daddr  = daddr->v4.sin_addr.s_addr;
435         fl4->fl4_dport = daddr->v4.sin_port;
436         fl4->flowi4_proto = IPPROTO_SCTP;
437         if (asoc) {
438                 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
439                 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
440                 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
441         }
442         if (saddr) {
443                 fl4->saddr = saddr->v4.sin_addr.s_addr;
444                 fl4->fl4_sport = saddr->v4.sin_port;
445         }
446 
447         pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
448                  &fl4->saddr);
449 
450         rt = ip_route_output_key(sock_net(sk), fl4);
451         if (!IS_ERR(rt))
452                 dst = &rt->dst;
453 
454         /* If there is no association or if a source address is passed, no
455          * more validation is required.
456          */
457         if (!asoc || saddr)
458                 goto out;
459 
460         bp = &asoc->base.bind_addr;
461 
462         if (dst) {
463                 /* Walk through the bind address list and look for a bind
464                  * address that matches the source address of the returned dst.
465                  */
466                 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
467                 rcu_read_lock();
468                 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
469                         if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
470                             (laddr->state != SCTP_ADDR_SRC &&
471                             !asoc->src_out_of_asoc_ok))
472                                 continue;
473                         if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
474                                 goto out_unlock;
475                 }
476                 rcu_read_unlock();
477 
478                 /* None of the bound addresses match the source address of the
479                  * dst. So release it.
480                  */
481                 dst_release(dst);
482                 dst = NULL;
483         }
484 
485         /* Walk through the bind address list and try to get a dst that
486          * matches a bind address as the source address.
487          */
488         rcu_read_lock();
489         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
490                 if (!laddr->valid)
491                         continue;
492                 if ((laddr->state == SCTP_ADDR_SRC) &&
493                     (AF_INET == laddr->a.sa.sa_family)) {
494                         fl4->fl4_sport = laddr->a.v4.sin_port;
495                         flowi4_update_output(fl4,
496                                              asoc->base.sk->sk_bound_dev_if,
497                                              RT_CONN_FLAGS(asoc->base.sk),
498                                              daddr->v4.sin_addr.s_addr,
499                                              laddr->a.v4.sin_addr.s_addr);
500 
501                         rt = ip_route_output_key(sock_net(sk), fl4);
502                         if (!IS_ERR(rt)) {
503                                 dst = &rt->dst;
504                                 goto out_unlock;
505                         }
506                 }
507         }
508 
509 out_unlock:
510         rcu_read_unlock();
511 out:
512         t->dst = dst;
513         if (dst)
514                 pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
515                          &fl4->daddr, &fl4->saddr);
516         else
517                 pr_debug("no route\n");
518 }
519 
520 /* For v4, the source address is cached in the route entry(dst). So no need
521  * to cache it separately and hence this is an empty routine.
522  */
523 static void sctp_v4_get_saddr(struct sctp_sock *sk,
524                               struct sctp_transport *t,
525                               struct flowi *fl)
526 {
527         union sctp_addr *saddr = &t->saddr;
528         struct rtable *rt = (struct rtable *)t->dst;
529 
530         if (rt) {
531                 saddr->v4.sin_family = AF_INET;
532                 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
533         }
534 }
535 
536 /* What interface did this skb arrive on? */
537 static int sctp_v4_skb_iif(const struct sk_buff *skb)
538 {
539         return inet_iif(skb);
540 }
541 
542 /* Was this packet marked by Explicit Congestion Notification? */
543 static int sctp_v4_is_ce(const struct sk_buff *skb)
544 {
545         return INET_ECN_is_ce(ip_hdr(skb)->tos);
546 }
547 
548 /* Create and initialize a new sk for the socket returned by accept(). */
549 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
550                                              struct sctp_association *asoc)
551 {
552         struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
553                         sk->sk_prot);
554         struct inet_sock *newinet;
555 
556         if (!newsk)
557                 goto out;
558 
559         sock_init_data(NULL, newsk);
560 
561         sctp_copy_sock(newsk, sk, asoc);
562         sock_reset_flag(newsk, SOCK_ZAPPED);
563 
564         newinet = inet_sk(newsk);
565 
566         newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
567 
568         sk_refcnt_debug_inc(newsk);
569 
570         if (newsk->sk_prot->init(newsk)) {
571                 sk_common_release(newsk);
572                 newsk = NULL;
573         }
574 
575 out:
576         return newsk;
577 }
578 
579 static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
580 {
581         /* No address mapping for V4 sockets */
582         return sizeof(struct sockaddr_in);
583 }
584 
585 /* Dump the v4 addr to the seq file. */
586 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
587 {
588         seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
589 }
590 
591 static void sctp_v4_ecn_capable(struct sock *sk)
592 {
593         INET_ECN_xmit(sk);
594 }
595 
596 static void sctp_addr_wq_timeout_handler(unsigned long arg)
597 {
598         struct net *net = (struct net *)arg;
599         struct sctp_sockaddr_entry *addrw, *temp;
600         struct sctp_sock *sp;
601 
602         spin_lock_bh(&net->sctp.addr_wq_lock);
603 
604         list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
605                 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
606                          "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
607                          addrw->state, addrw);
608 
609 #if IS_ENABLED(CONFIG_IPV6)
610                 /* Now we send an ASCONF for each association */
611                 /* Note. we currently don't handle link local IPv6 addressees */
612                 if (addrw->a.sa.sa_family == AF_INET6) {
613                         struct in6_addr *in6;
614 
615                         if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
616                             IPV6_ADDR_LINKLOCAL)
617                                 goto free_next;
618 
619                         in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
620                         if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
621                             addrw->state == SCTP_ADDR_NEW) {
622                                 unsigned long timeo_val;
623 
624                                 pr_debug("%s: this is on DAD, trying %d sec "
625                                          "later\n", __func__,
626                                          SCTP_ADDRESS_TICK_DELAY);
627 
628                                 timeo_val = jiffies;
629                                 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
630                                 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
631                                 break;
632                         }
633                 }
634 #endif
635                 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
636                         struct sock *sk;
637 
638                         sk = sctp_opt2sk(sp);
639                         /* ignore bound-specific endpoints */
640                         if (!sctp_is_ep_boundall(sk))
641                                 continue;
642                         bh_lock_sock(sk);
643                         if (sctp_asconf_mgmt(sp, addrw) < 0)
644                                 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
645                         bh_unlock_sock(sk);
646                 }
647 #if IS_ENABLED(CONFIG_IPV6)
648 free_next:
649 #endif
650                 list_del(&addrw->list);
651                 kfree(addrw);
652         }
653         spin_unlock_bh(&net->sctp.addr_wq_lock);
654 }
655 
656 static void sctp_free_addr_wq(struct net *net)
657 {
658         struct sctp_sockaddr_entry *addrw;
659         struct sctp_sockaddr_entry *temp;
660 
661         spin_lock_bh(&net->sctp.addr_wq_lock);
662         del_timer(&net->sctp.addr_wq_timer);
663         list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
664                 list_del(&addrw->list);
665                 kfree(addrw);
666         }
667         spin_unlock_bh(&net->sctp.addr_wq_lock);
668 }
669 
670 /* lookup the entry for the same address in the addr_waitq
671  * sctp_addr_wq MUST be locked
672  */
673 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
674                                         struct sctp_sockaddr_entry *addr)
675 {
676         struct sctp_sockaddr_entry *addrw;
677 
678         list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
679                 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
680                         continue;
681                 if (addrw->a.sa.sa_family == AF_INET) {
682                         if (addrw->a.v4.sin_addr.s_addr ==
683                             addr->a.v4.sin_addr.s_addr)
684                                 return addrw;
685                 } else if (addrw->a.sa.sa_family == AF_INET6) {
686                         if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
687                             &addr->a.v6.sin6_addr))
688                                 return addrw;
689                 }
690         }
691         return NULL;
692 }
693 
694 void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
695 {
696         struct sctp_sockaddr_entry *addrw;
697         unsigned long timeo_val;
698 
699         /* first, we check if an opposite message already exist in the queue.
700          * If we found such message, it is removed.
701          * This operation is a bit stupid, but the DHCP client attaches the
702          * new address after a couple of addition and deletion of that address
703          */
704 
705         spin_lock_bh(&net->sctp.addr_wq_lock);
706         /* Offsets existing events in addr_wq */
707         addrw = sctp_addr_wq_lookup(net, addr);
708         if (addrw) {
709                 if (addrw->state != cmd) {
710                         pr_debug("%s: offsets existing entry for %d, addr:%pISc "
711                                  "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
712                                  &net->sctp.addr_waitq);
713 
714                         list_del(&addrw->list);
715                         kfree(addrw);
716                 }
717                 spin_unlock_bh(&net->sctp.addr_wq_lock);
718                 return;
719         }
720 
721         /* OK, we have to add the new address to the wait queue */
722         addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
723         if (addrw == NULL) {
724                 spin_unlock_bh(&net->sctp.addr_wq_lock);
725                 return;
726         }
727         addrw->state = cmd;
728         list_add_tail(&addrw->list, &net->sctp.addr_waitq);
729 
730         pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
731                  __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
732 
733         if (!timer_pending(&net->sctp.addr_wq_timer)) {
734                 timeo_val = jiffies;
735                 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
736                 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
737         }
738         spin_unlock_bh(&net->sctp.addr_wq_lock);
739 }
740 
741 /* Event handler for inet address addition/deletion events.
742  * The sctp_local_addr_list needs to be protocted by a spin lock since
743  * multiple notifiers (say IPv4 and IPv6) may be running at the same
744  * time and thus corrupt the list.
745  * The reader side is protected with RCU.
746  */
747 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
748                                void *ptr)
749 {
750         struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
751         struct sctp_sockaddr_entry *addr = NULL;
752         struct sctp_sockaddr_entry *temp;
753         struct net *net = dev_net(ifa->ifa_dev->dev);
754         int found = 0;
755 
756         switch (ev) {
757         case NETDEV_UP:
758                 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
759                 if (addr) {
760                         addr->a.v4.sin_family = AF_INET;
761                         addr->a.v4.sin_port = 0;
762                         addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
763                         addr->valid = 1;
764                         spin_lock_bh(&net->sctp.local_addr_lock);
765                         list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
766                         sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
767                         spin_unlock_bh(&net->sctp.local_addr_lock);
768                 }
769                 break;
770         case NETDEV_DOWN:
771                 spin_lock_bh(&net->sctp.local_addr_lock);
772                 list_for_each_entry_safe(addr, temp,
773                                         &net->sctp.local_addr_list, list) {
774                         if (addr->a.sa.sa_family == AF_INET &&
775                                         addr->a.v4.sin_addr.s_addr ==
776                                         ifa->ifa_local) {
777                                 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
778                                 found = 1;
779                                 addr->valid = 0;
780                                 list_del_rcu(&addr->list);
781                                 break;
782                         }
783                 }
784                 spin_unlock_bh(&net->sctp.local_addr_lock);
785                 if (found)
786                         kfree_rcu(addr, rcu);
787                 break;
788         }
789 
790         return NOTIFY_DONE;
791 }
792 
793 /*
794  * Initialize the control inode/socket with a control endpoint data
795  * structure.  This endpoint is reserved exclusively for the OOTB processing.
796  */
797 static int sctp_ctl_sock_init(struct net *net)
798 {
799         int err;
800         sa_family_t family = PF_INET;
801 
802         if (sctp_get_pf_specific(PF_INET6))
803                 family = PF_INET6;
804 
805         err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
806                                    SOCK_SEQPACKET, IPPROTO_SCTP, net);
807 
808         /* If IPv6 socket could not be created, try the IPv4 socket */
809         if (err < 0 && family == PF_INET6)
810                 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
811                                            SOCK_SEQPACKET, IPPROTO_SCTP,
812                                            net);
813 
814         if (err < 0) {
815                 pr_err("Failed to create the SCTP control socket\n");
816                 return err;
817         }
818         return 0;
819 }
820 
821 /* Register address family specific functions. */
822 int sctp_register_af(struct sctp_af *af)
823 {
824         switch (af->sa_family) {
825         case AF_INET:
826                 if (sctp_af_v4_specific)
827                         return 0;
828                 sctp_af_v4_specific = af;
829                 break;
830         case AF_INET6:
831                 if (sctp_af_v6_specific)
832                         return 0;
833                 sctp_af_v6_specific = af;
834                 break;
835         default:
836                 return 0;
837         }
838 
839         INIT_LIST_HEAD(&af->list);
840         list_add_tail(&af->list, &sctp_address_families);
841         return 1;
842 }
843 
844 /* Get the table of functions for manipulating a particular address
845  * family.
846  */
847 struct sctp_af *sctp_get_af_specific(sa_family_t family)
848 {
849         switch (family) {
850         case AF_INET:
851                 return sctp_af_v4_specific;
852         case AF_INET6:
853                 return sctp_af_v6_specific;
854         default:
855                 return NULL;
856         }
857 }
858 
859 /* Common code to initialize a AF_INET msg_name. */
860 static void sctp_inet_msgname(char *msgname, int *addr_len)
861 {
862         struct sockaddr_in *sin;
863 
864         sin = (struct sockaddr_in *)msgname;
865         *addr_len = sizeof(struct sockaddr_in);
866         sin->sin_family = AF_INET;
867         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
868 }
869 
870 /* Copy the primary address of the peer primary address as the msg_name. */
871 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
872                                     int *addr_len)
873 {
874         struct sockaddr_in *sin, *sinfrom;
875 
876         if (msgname) {
877                 struct sctp_association *asoc;
878 
879                 asoc = event->asoc;
880                 sctp_inet_msgname(msgname, addr_len);
881                 sin = (struct sockaddr_in *)msgname;
882                 sinfrom = &asoc->peer.primary_addr.v4;
883                 sin->sin_port = htons(asoc->peer.port);
884                 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
885         }
886 }
887 
888 /* Initialize and copy out a msgname from an inbound skb. */
889 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
890 {
891         if (msgname) {
892                 struct sctphdr *sh = sctp_hdr(skb);
893                 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
894 
895                 sctp_inet_msgname(msgname, len);
896                 sin->sin_port = sh->source;
897                 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
898         }
899 }
900 
901 /* Do we support this AF? */
902 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
903 {
904         /* PF_INET only supports AF_INET addresses. */
905         return AF_INET == family;
906 }
907 
908 /* Address matching with wildcards allowed. */
909 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
910                               const union sctp_addr *addr2,
911                               struct sctp_sock *opt)
912 {
913         /* PF_INET only supports AF_INET addresses. */
914         if (addr1->sa.sa_family != addr2->sa.sa_family)
915                 return 0;
916         if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
917             htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
918                 return 1;
919         if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
920                 return 1;
921 
922         return 0;
923 }
924 
925 /* Verify that provided sockaddr looks bindable.  Common verification has
926  * already been taken care of.
927  */
928 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
929 {
930         return sctp_v4_available(addr, opt);
931 }
932 
933 /* Verify that sockaddr looks sendable.  Common verification has already
934  * been taken care of.
935  */
936 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
937 {
938         return 1;
939 }
940 
941 /* Fill in Supported Address Type information for INIT and INIT-ACK
942  * chunks.  Returns number of addresses supported.
943  */
944 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
945                                      __be16 *types)
946 {
947         types[0] = SCTP_PARAM_IPV4_ADDRESS;
948         return 1;
949 }
950 
951 /* Wrapper routine that calls the ip transmit routine. */
952 static inline int sctp_v4_xmit(struct sk_buff *skb,
953                                struct sctp_transport *transport)
954 {
955         struct inet_sock *inet = inet_sk(skb->sk);
956 
957         pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
958                  skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr);
959 
960         inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
961                          IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
962 
963         SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
964 
965         return ip_queue_xmit(&inet->sk, skb, &transport->fl);
966 }
967 
968 static struct sctp_af sctp_af_inet;
969 
970 static struct sctp_pf sctp_pf_inet = {
971         .event_msgname = sctp_inet_event_msgname,
972         .skb_msgname   = sctp_inet_skb_msgname,
973         .af_supported  = sctp_inet_af_supported,
974         .cmp_addr      = sctp_inet_cmp_addr,
975         .bind_verify   = sctp_inet_bind_verify,
976         .send_verify   = sctp_inet_send_verify,
977         .supported_addrs = sctp_inet_supported_addrs,
978         .create_accept_sk = sctp_v4_create_accept_sk,
979         .addr_to_user  = sctp_v4_addr_to_user,
980         .to_sk_saddr   = sctp_v4_to_sk_saddr,
981         .to_sk_daddr   = sctp_v4_to_sk_daddr,
982         .af            = &sctp_af_inet
983 };
984 
985 /* Notifier for inetaddr addition/deletion events.  */
986 static struct notifier_block sctp_inetaddr_notifier = {
987         .notifier_call = sctp_inetaddr_event,
988 };
989 
990 /* Socket operations.  */
991 static const struct proto_ops inet_seqpacket_ops = {
992         .family            = PF_INET,
993         .owner             = THIS_MODULE,
994         .release           = inet_release,      /* Needs to be wrapped... */
995         .bind              = inet_bind,
996         .connect           = inet_dgram_connect,
997         .socketpair        = sock_no_socketpair,
998         .accept            = inet_accept,
999         .getname           = inet_getname,      /* Semantics are different.  */
1000         .poll              = sctp_poll,
1001         .ioctl             = inet_ioctl,
1002         .listen            = sctp_inet_listen,
1003         .shutdown          = inet_shutdown,     /* Looks harmless.  */
1004         .setsockopt        = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1005         .getsockopt        = sock_common_getsockopt,
1006         .sendmsg           = inet_sendmsg,
1007         .recvmsg           = sock_common_recvmsg,
1008         .mmap              = sock_no_mmap,
1009         .sendpage          = sock_no_sendpage,
1010 #ifdef CONFIG_COMPAT
1011         .compat_setsockopt = compat_sock_common_setsockopt,
1012         .compat_getsockopt = compat_sock_common_getsockopt,
1013 #endif
1014 };
1015 
1016 /* Registration with AF_INET family.  */
1017 static struct inet_protosw sctp_seqpacket_protosw = {
1018         .type       = SOCK_SEQPACKET,
1019         .protocol   = IPPROTO_SCTP,
1020         .prot       = &sctp_prot,
1021         .ops        = &inet_seqpacket_ops,
1022         .flags      = SCTP_PROTOSW_FLAG
1023 };
1024 static struct inet_protosw sctp_stream_protosw = {
1025         .type       = SOCK_STREAM,
1026         .protocol   = IPPROTO_SCTP,
1027         .prot       = &sctp_prot,
1028         .ops        = &inet_seqpacket_ops,
1029         .flags      = SCTP_PROTOSW_FLAG
1030 };
1031 
1032 /* Register with IP layer.  */
1033 static const struct net_protocol sctp_protocol = {
1034         .handler     = sctp_rcv,
1035         .err_handler = sctp_v4_err,
1036         .no_policy   = 1,
1037         .netns_ok    = 1,
1038         .icmp_strict_tag_validation = 1,
1039 };
1040 
1041 /* IPv4 address related functions.  */
1042 static struct sctp_af sctp_af_inet = {
1043         .sa_family         = AF_INET,
1044         .sctp_xmit         = sctp_v4_xmit,
1045         .setsockopt        = ip_setsockopt,
1046         .getsockopt        = ip_getsockopt,
1047         .get_dst           = sctp_v4_get_dst,
1048         .get_saddr         = sctp_v4_get_saddr,
1049         .copy_addrlist     = sctp_v4_copy_addrlist,
1050         .from_skb          = sctp_v4_from_skb,
1051         .from_sk           = sctp_v4_from_sk,
1052         .from_addr_param   = sctp_v4_from_addr_param,
1053         .to_addr_param     = sctp_v4_to_addr_param,
1054         .cmp_addr          = sctp_v4_cmp_addr,
1055         .addr_valid        = sctp_v4_addr_valid,
1056         .inaddr_any        = sctp_v4_inaddr_any,
1057         .is_any            = sctp_v4_is_any,
1058         .available         = sctp_v4_available,
1059         .scope             = sctp_v4_scope,
1060         .skb_iif           = sctp_v4_skb_iif,
1061         .is_ce             = sctp_v4_is_ce,
1062         .seq_dump_addr     = sctp_v4_seq_dump_addr,
1063         .ecn_capable       = sctp_v4_ecn_capable,
1064         .net_header_len    = sizeof(struct iphdr),
1065         .sockaddr_len      = sizeof(struct sockaddr_in),
1066 #ifdef CONFIG_COMPAT
1067         .compat_setsockopt = compat_ip_setsockopt,
1068         .compat_getsockopt = compat_ip_getsockopt,
1069 #endif
1070 };
1071 
1072 struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
1073 {
1074         switch (family) {
1075         case PF_INET:
1076                 return sctp_pf_inet_specific;
1077         case PF_INET6:
1078                 return sctp_pf_inet6_specific;
1079         default:
1080                 return NULL;
1081         }
1082 }
1083 
1084 /* Register the PF specific function table.  */
1085 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1086 {
1087         switch (family) {
1088         case PF_INET:
1089                 if (sctp_pf_inet_specific)
1090                         return 0;
1091                 sctp_pf_inet_specific = pf;
1092                 break;
1093         case PF_INET6:
1094                 if (sctp_pf_inet6_specific)
1095                         return 0;
1096                 sctp_pf_inet6_specific = pf;
1097                 break;
1098         default:
1099                 return 0;
1100         }
1101         return 1;
1102 }
1103 
1104 static inline int init_sctp_mibs(struct net *net)
1105 {
1106         net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib);
1107         if (!net->sctp.sctp_statistics)
1108                 return -ENOMEM;
1109         return 0;
1110 }
1111 
1112 static inline void cleanup_sctp_mibs(struct net *net)
1113 {
1114         free_percpu(net->sctp.sctp_statistics);
1115 }
1116 
1117 static void sctp_v4_pf_init(void)
1118 {
1119         /* Initialize the SCTP specific PF functions. */
1120         sctp_register_pf(&sctp_pf_inet, PF_INET);
1121         sctp_register_af(&sctp_af_inet);
1122 }
1123 
1124 static void sctp_v4_pf_exit(void)
1125 {
1126         list_del(&sctp_af_inet.list);
1127 }
1128 
1129 static int sctp_v4_protosw_init(void)
1130 {
1131         int rc;
1132 
1133         rc = proto_register(&sctp_prot, 1);
1134         if (rc)
1135                 return rc;
1136 
1137         /* Register SCTP(UDP and TCP style) with socket layer.  */
1138         inet_register_protosw(&sctp_seqpacket_protosw);
1139         inet_register_protosw(&sctp_stream_protosw);
1140 
1141         return 0;
1142 }
1143 
1144 static void sctp_v4_protosw_exit(void)
1145 {
1146         inet_unregister_protosw(&sctp_stream_protosw);
1147         inet_unregister_protosw(&sctp_seqpacket_protosw);
1148         proto_unregister(&sctp_prot);
1149 }
1150 
1151 static int sctp_v4_add_protocol(void)
1152 {
1153         /* Register notifier for inet address additions/deletions. */
1154         register_inetaddr_notifier(&sctp_inetaddr_notifier);
1155 
1156         /* Register SCTP with inet layer.  */
1157         if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1158                 return -EAGAIN;
1159 
1160         return 0;
1161 }
1162 
1163 static void sctp_v4_del_protocol(void)
1164 {
1165         inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1166         unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1167 }
1168 
1169 static int __net_init sctp_net_init(struct net *net)
1170 {
1171         int status;
1172 
1173         /*
1174          * 14. Suggested SCTP Protocol Parameter Values
1175          */
1176         /* The following protocol parameters are RECOMMENDED:  */
1177         /* RTO.Initial              - 3  seconds */
1178         net->sctp.rto_initial                   = SCTP_RTO_INITIAL;
1179         /* RTO.Min                  - 1  second */
1180         net->sctp.rto_min                       = SCTP_RTO_MIN;
1181         /* RTO.Max                 -  60 seconds */
1182         net->sctp.rto_max                       = SCTP_RTO_MAX;
1183         /* RTO.Alpha                - 1/8 */
1184         net->sctp.rto_alpha                     = SCTP_RTO_ALPHA;
1185         /* RTO.Beta                 - 1/4 */
1186         net->sctp.rto_beta                      = SCTP_RTO_BETA;
1187 
1188         /* Valid.Cookie.Life        - 60  seconds */
1189         net->sctp.valid_cookie_life             = SCTP_DEFAULT_COOKIE_LIFE;
1190 
1191         /* Whether Cookie Preservative is enabled(1) or not(0) */
1192         net->sctp.cookie_preserve_enable        = 1;
1193 
1194         /* Default sctp sockets to use md5 as their hmac alg */
1195 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1196         net->sctp.sctp_hmac_alg                 = "md5";
1197 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1198         net->sctp.sctp_hmac_alg                 = "sha1";
1199 #else
1200         net->sctp.sctp_hmac_alg                 = NULL;
1201 #endif
1202 
1203         /* Max.Burst                - 4 */
1204         net->sctp.max_burst                     = SCTP_DEFAULT_MAX_BURST;
1205 
1206         /* Association.Max.Retrans  - 10 attempts
1207          * Path.Max.Retrans         - 5  attempts (per destination address)
1208          * Max.Init.Retransmits     - 8  attempts
1209          */
1210         net->sctp.max_retrans_association       = 10;
1211         net->sctp.max_retrans_path              = 5;
1212         net->sctp.max_retrans_init              = 8;
1213 
1214         /* Sendbuffer growth        - do per-socket accounting */
1215         net->sctp.sndbuf_policy                 = 0;
1216 
1217         /* Rcvbuffer growth         - do per-socket accounting */
1218         net->sctp.rcvbuf_policy                 = 0;
1219 
1220         /* HB.interval              - 30 seconds */
1221         net->sctp.hb_interval                   = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1222 
1223         /* delayed SACK timeout */
1224         net->sctp.sack_timeout                  = SCTP_DEFAULT_TIMEOUT_SACK;
1225 
1226         /* Disable ADDIP by default. */
1227         net->sctp.addip_enable = 0;
1228         net->sctp.addip_noauth = 0;
1229         net->sctp.default_auto_asconf = 0;
1230 
1231         /* Enable PR-SCTP by default. */
1232         net->sctp.prsctp_enable = 1;
1233 
1234         /* Disable AUTH by default. */
1235         net->sctp.auth_enable = 0;
1236 
1237         /* Set SCOPE policy to enabled */
1238         net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1239 
1240         /* Set the default rwnd update threshold */
1241         net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1242 
1243         /* Initialize maximum autoclose timeout. */
1244         net->sctp.max_autoclose         = INT_MAX / HZ;
1245 
1246         status = sctp_sysctl_net_register(net);
1247         if (status)
1248                 goto err_sysctl_register;
1249 
1250         /* Allocate and initialise sctp mibs.  */
1251         status = init_sctp_mibs(net);
1252         if (status)
1253                 goto err_init_mibs;
1254 
1255         /* Initialize proc fs directory.  */
1256         status = sctp_proc_init(net);
1257         if (status)
1258                 goto err_init_proc;
1259 
1260         sctp_dbg_objcnt_init(net);
1261 
1262         /* Initialize the control inode/socket for handling OOTB packets.  */
1263         if ((status = sctp_ctl_sock_init(net))) {
1264                 pr_err("Failed to initialize the SCTP control sock\n");
1265                 goto err_ctl_sock_init;
1266         }
1267 
1268         /* Initialize the local address list. */
1269         INIT_LIST_HEAD(&net->sctp.local_addr_list);
1270         spin_lock_init(&net->sctp.local_addr_lock);
1271         sctp_get_local_addr_list(net);
1272 
1273         /* Initialize the address event list */
1274         INIT_LIST_HEAD(&net->sctp.addr_waitq);
1275         INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1276         spin_lock_init(&net->sctp.addr_wq_lock);
1277         net->sctp.addr_wq_timer.expires = 0;
1278         setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler,
1279                     (unsigned long)net);
1280 
1281         return 0;
1282 
1283 err_ctl_sock_init:
1284         sctp_dbg_objcnt_exit(net);
1285         sctp_proc_exit(net);
1286 err_init_proc:
1287         cleanup_sctp_mibs(net);
1288 err_init_mibs:
1289         sctp_sysctl_net_unregister(net);
1290 err_sysctl_register:
1291         return status;
1292 }
1293 
1294 static void __net_exit sctp_net_exit(struct net *net)
1295 {
1296         /* Free the local address list */
1297         sctp_free_addr_wq(net);
1298         sctp_free_local_addr_list(net);
1299 
1300         /* Free the control endpoint.  */
1301         inet_ctl_sock_destroy(net->sctp.ctl_sock);
1302 
1303         sctp_dbg_objcnt_exit(net);
1304 
1305         sctp_proc_exit(net);
1306         cleanup_sctp_mibs(net);
1307         sctp_sysctl_net_unregister(net);
1308 }
1309 
1310 static struct pernet_operations sctp_net_ops = {
1311         .init = sctp_net_init,
1312         .exit = sctp_net_exit,
1313 };
1314 
1315 /* Initialize the universe into something sensible.  */
1316 static __init int sctp_init(void)
1317 {
1318         int i;
1319         int status = -EINVAL;
1320         unsigned long goal;
1321         unsigned long limit;
1322         int max_share;
1323         int order;
1324 
1325         BUILD_BUG_ON(sizeof(struct sctp_ulpevent) >
1326                      sizeof(((struct sk_buff *) 0)->cb));
1327 
1328         /* Allocate bind_bucket and chunk caches. */
1329         status = -ENOBUFS;
1330         sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1331                                                sizeof(struct sctp_bind_bucket),
1332                                                0, SLAB_HWCACHE_ALIGN,
1333                                                NULL);
1334         if (!sctp_bucket_cachep)
1335                 goto out;
1336 
1337         sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1338                                                sizeof(struct sctp_chunk),
1339                                                0, SLAB_HWCACHE_ALIGN,
1340                                                NULL);
1341         if (!sctp_chunk_cachep)
1342                 goto err_chunk_cachep;
1343 
1344         status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL);
1345         if (status)
1346                 goto err_percpu_counter_init;
1347 
1348         /* Implementation specific variables. */
1349 
1350         /* Initialize default stream count setup information. */
1351         sctp_max_instreams              = SCTP_DEFAULT_INSTREAMS;
1352         sctp_max_outstreams             = SCTP_DEFAULT_OUTSTREAMS;
1353 
1354         /* Initialize handle used for association ids. */
1355         idr_init(&sctp_assocs_id);
1356 
1357         limit = nr_free_buffer_pages() / 8;
1358         limit = max(limit, 128UL);
1359         sysctl_sctp_mem[0] = limit / 4 * 3;
1360         sysctl_sctp_mem[1] = limit;
1361         sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1362 
1363         /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1364         limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1365         max_share = min(4UL*1024*1024, limit);
1366 
1367         sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1368         sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1369         sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1370 
1371         sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1372         sysctl_sctp_wmem[1] = 16*1024;
1373         sysctl_sctp_wmem[2] = max(64*1024, max_share);
1374 
1375         /* Size and allocate the association hash table.
1376          * The methodology is similar to that of the tcp hash tables.
1377          */
1378         if (totalram_pages >= (128 * 1024))
1379                 goal = totalram_pages >> (22 - PAGE_SHIFT);
1380         else
1381                 goal = totalram_pages >> (24 - PAGE_SHIFT);
1382 
1383         for (order = 0; (1UL << order) < goal; order++)
1384                 ;
1385 
1386         do {
1387                 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1388                                         sizeof(struct sctp_hashbucket);
1389                 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1390                         continue;
1391                 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1392                         __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1393         } while (!sctp_assoc_hashtable && --order > 0);
1394         if (!sctp_assoc_hashtable) {
1395                 pr_err("Failed association hash alloc\n");
1396                 status = -ENOMEM;
1397                 goto err_ahash_alloc;
1398         }
1399         for (i = 0; i < sctp_assoc_hashsize; i++) {
1400                 rwlock_init(&sctp_assoc_hashtable[i].lock);
1401                 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
1402         }
1403 
1404         /* Allocate and initialize the endpoint hash table.  */
1405         sctp_ep_hashsize = 64;
1406         sctp_ep_hashtable =
1407                 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1408         if (!sctp_ep_hashtable) {
1409                 pr_err("Failed endpoint_hash alloc\n");
1410                 status = -ENOMEM;
1411                 goto err_ehash_alloc;
1412         }
1413         for (i = 0; i < sctp_ep_hashsize; i++) {
1414                 rwlock_init(&sctp_ep_hashtable[i].lock);
1415                 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1416         }
1417 
1418         /* Allocate and initialize the SCTP port hash table.  */
1419         do {
1420                 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1421                                         sizeof(struct sctp_bind_hashbucket);
1422                 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1423                         continue;
1424                 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1425                         __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1426         } while (!sctp_port_hashtable && --order > 0);
1427         if (!sctp_port_hashtable) {
1428                 pr_err("Failed bind hash alloc\n");
1429                 status = -ENOMEM;
1430                 goto err_bhash_alloc;
1431         }
1432         for (i = 0; i < sctp_port_hashsize; i++) {
1433                 spin_lock_init(&sctp_port_hashtable[i].lock);
1434                 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1435         }
1436 
1437         pr_info("Hash tables configured (established %d bind %d)\n",
1438                 sctp_assoc_hashsize, sctp_port_hashsize);
1439 
1440         sctp_sysctl_register();
1441 
1442         INIT_LIST_HEAD(&sctp_address_families);
1443         sctp_v4_pf_init();
1444         sctp_v6_pf_init();
1445 
1446         status = sctp_v4_protosw_init();
1447 
1448         if (status)
1449                 goto err_protosw_init;
1450 
1451         status = sctp_v6_protosw_init();
1452         if (status)
1453                 goto err_v6_protosw_init;
1454 
1455         status = register_pernet_subsys(&sctp_net_ops);
1456         if (status)
1457                 goto err_register_pernet_subsys;
1458 
1459         status = sctp_v4_add_protocol();
1460         if (status)
1461                 goto err_add_protocol;
1462 
1463         /* Register SCTP with inet6 layer.  */
1464         status = sctp_v6_add_protocol();
1465         if (status)
1466                 goto err_v6_add_protocol;
1467 
1468 out:
1469         return status;
1470 err_v6_add_protocol:
1471         sctp_v4_del_protocol();
1472 err_add_protocol:
1473         unregister_pernet_subsys(&sctp_net_ops);
1474 err_register_pernet_subsys:
1475         sctp_v6_protosw_exit();
1476 err_v6_protosw_init:
1477         sctp_v4_protosw_exit();
1478 err_protosw_init:
1479         sctp_v4_pf_exit();
1480         sctp_v6_pf_exit();
1481         sctp_sysctl_unregister();
1482         free_pages((unsigned long)sctp_port_hashtable,
1483                    get_order(sctp_port_hashsize *
1484                              sizeof(struct sctp_bind_hashbucket)));
1485 err_bhash_alloc:
1486         kfree(sctp_ep_hashtable);
1487 err_ehash_alloc:
1488         free_pages((unsigned long)sctp_assoc_hashtable,
1489                    get_order(sctp_assoc_hashsize *
1490                              sizeof(struct sctp_hashbucket)));
1491 err_ahash_alloc:
1492         percpu_counter_destroy(&sctp_sockets_allocated);
1493 err_percpu_counter_init:
1494         kmem_cache_destroy(sctp_chunk_cachep);
1495 err_chunk_cachep:
1496         kmem_cache_destroy(sctp_bucket_cachep);
1497         goto out;
1498 }
1499 
1500 /* Exit handler for the SCTP protocol.  */
1501 static __exit void sctp_exit(void)
1502 {
1503         /* BUG.  This should probably do something useful like clean
1504          * up all the remaining associations and all that memory.
1505          */
1506 
1507         /* Unregister with inet6/inet layers. */
1508         sctp_v6_del_protocol();
1509         sctp_v4_del_protocol();
1510 
1511         unregister_pernet_subsys(&sctp_net_ops);
1512 
1513         /* Free protosw registrations */
1514         sctp_v6_protosw_exit();
1515         sctp_v4_protosw_exit();
1516 
1517         /* Unregister with socket layer. */
1518         sctp_v6_pf_exit();
1519         sctp_v4_pf_exit();
1520 
1521         sctp_sysctl_unregister();
1522 
1523         free_pages((unsigned long)sctp_assoc_hashtable,
1524                    get_order(sctp_assoc_hashsize *
1525                              sizeof(struct sctp_hashbucket)));
1526         kfree(sctp_ep_hashtable);
1527         free_pages((unsigned long)sctp_port_hashtable,
1528                    get_order(sctp_port_hashsize *
1529                              sizeof(struct sctp_bind_hashbucket)));
1530 
1531         percpu_counter_destroy(&sctp_sockets_allocated);
1532 
1533         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1534 
1535         kmem_cache_destroy(sctp_chunk_cachep);
1536         kmem_cache_destroy(sctp_bucket_cachep);
1537 }
1538 
1539 module_init(sctp_init);
1540 module_exit(sctp_exit);
1541 
1542 /*
1543  * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1544  */
1545 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1546 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1547 MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
1548 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1549 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1550 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1551 MODULE_LICENSE("GPL");
1552 

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