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

Version: ~ [ linux-5.19-rc3 ] ~ [ linux-5.18.5 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.48 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.123 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.199 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.248 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.284 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.319 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ 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 #define MAX_SCTP_PORT_HASH_ENTRIES (64 * 1024)
 64 
 65 /* Global data structures. */
 66 struct sctp_globals sctp_globals __read_mostly;
 67 
 68 struct idr sctp_assocs_id;
 69 DEFINE_SPINLOCK(sctp_assocs_id_lock);
 70 
 71 static struct sctp_pf *sctp_pf_inet6_specific;
 72 static struct sctp_pf *sctp_pf_inet_specific;
 73 static struct sctp_af *sctp_af_v4_specific;
 74 static struct sctp_af *sctp_af_v6_specific;
 75 
 76 struct kmem_cache *sctp_chunk_cachep __read_mostly;
 77 struct kmem_cache *sctp_bucket_cachep __read_mostly;
 78 
 79 long sysctl_sctp_mem[3];
 80 int sysctl_sctp_rmem[3];
 81 int sysctl_sctp_wmem[3];
 82 
 83 /* Set up the proc fs entry for the SCTP protocol. */
 84 static int __net_init sctp_proc_init(struct net *net)
 85 {
 86 #ifdef CONFIG_PROC_FS
 87         net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net);
 88         if (!net->sctp.proc_net_sctp)
 89                 goto out_proc_net_sctp;
 90         if (sctp_snmp_proc_init(net))
 91                 goto out_snmp_proc_init;
 92         if (sctp_eps_proc_init(net))
 93                 goto out_eps_proc_init;
 94         if (sctp_assocs_proc_init(net))
 95                 goto out_assocs_proc_init;
 96         if (sctp_remaddr_proc_init(net))
 97                 goto out_remaddr_proc_init;
 98 
 99         return 0;
100 
101 out_remaddr_proc_init:
102         sctp_assocs_proc_exit(net);
103 out_assocs_proc_init:
104         sctp_eps_proc_exit(net);
105 out_eps_proc_init:
106         sctp_snmp_proc_exit(net);
107 out_snmp_proc_init:
108         remove_proc_entry("sctp", net->proc_net);
109         net->sctp.proc_net_sctp = NULL;
110 out_proc_net_sctp:
111         return -ENOMEM;
112 #endif /* CONFIG_PROC_FS */
113         return 0;
114 }
115 
116 /* Clean up the proc fs entry for the SCTP protocol.
117  * Note: Do not make this __exit as it is used in the init error
118  * path.
119  */
120 static void sctp_proc_exit(struct net *net)
121 {
122 #ifdef CONFIG_PROC_FS
123         sctp_snmp_proc_exit(net);
124         sctp_eps_proc_exit(net);
125         sctp_assocs_proc_exit(net);
126         sctp_remaddr_proc_exit(net);
127 
128         remove_proc_entry("sctp", net->proc_net);
129         net->sctp.proc_net_sctp = NULL;
130 #endif
131 }
132 
133 /* Private helper to extract ipv4 address and stash them in
134  * the protocol structure.
135  */
136 static void sctp_v4_copy_addrlist(struct list_head *addrlist,
137                                   struct net_device *dev)
138 {
139         struct in_device *in_dev;
140         struct in_ifaddr *ifa;
141         struct sctp_sockaddr_entry *addr;
142 
143         rcu_read_lock();
144         if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
145                 rcu_read_unlock();
146                 return;
147         }
148 
149         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
150                 /* Add the address to the local list.  */
151                 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
152                 if (addr) {
153                         addr->a.v4.sin_family = AF_INET;
154                         addr->a.v4.sin_port = 0;
155                         addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
156                         addr->valid = 1;
157                         INIT_LIST_HEAD(&addr->list);
158                         list_add_tail(&addr->list, addrlist);
159                 }
160         }
161 
162         rcu_read_unlock();
163 }
164 
165 /* Extract our IP addresses from the system and stash them in the
166  * protocol structure.
167  */
168 static void sctp_get_local_addr_list(struct net *net)
169 {
170         struct net_device *dev;
171         struct list_head *pos;
172         struct sctp_af *af;
173 
174         rcu_read_lock();
175         for_each_netdev_rcu(net, dev) {
176                 list_for_each(pos, &sctp_address_families) {
177                         af = list_entry(pos, struct sctp_af, list);
178                         af->copy_addrlist(&net->sctp.local_addr_list, dev);
179                 }
180         }
181         rcu_read_unlock();
182 }
183 
184 /* Free the existing local addresses.  */
185 static void sctp_free_local_addr_list(struct net *net)
186 {
187         struct sctp_sockaddr_entry *addr;
188         struct list_head *pos, *temp;
189 
190         list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
191                 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
192                 list_del(pos);
193                 kfree(addr);
194         }
195 }
196 
197 /* Copy the local addresses which are valid for 'scope' into 'bp'.  */
198 int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
199                               sctp_scope_t scope, gfp_t gfp, int copy_flags)
200 {
201         struct sctp_sockaddr_entry *addr;
202         int error = 0;
203 
204         rcu_read_lock();
205         list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
206                 if (!addr->valid)
207                         continue;
208                 if (sctp_in_scope(net, &addr->a, scope)) {
209                         /* Now that the address is in scope, check to see if
210                          * the address type is really supported by the local
211                          * sock as well as the remote peer.
212                          */
213                         if ((((AF_INET == addr->a.sa.sa_family) &&
214                               (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
215                             (((AF_INET6 == addr->a.sa.sa_family) &&
216                               (copy_flags & SCTP_ADDR6_ALLOWED) &&
217                               (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
218                                 error = sctp_add_bind_addr(bp, &addr->a,
219                                                     SCTP_ADDR_SRC, GFP_ATOMIC);
220                                 if (error)
221                                         goto end_copy;
222                         }
223                 }
224         }
225 
226 end_copy:
227         rcu_read_unlock();
228         return error;
229 }
230 
231 /* Initialize a sctp_addr from in incoming skb.  */
232 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
233                              int is_saddr)
234 {
235         void *from;
236         __be16 *port;
237         struct sctphdr *sh;
238 
239         port = &addr->v4.sin_port;
240         addr->v4.sin_family = AF_INET;
241 
242         sh = sctp_hdr(skb);
243         if (is_saddr) {
244                 *port  = sh->source;
245                 from = &ip_hdr(skb)->saddr;
246         } else {
247                 *port = sh->dest;
248                 from = &ip_hdr(skb)->daddr;
249         }
250         memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
251 }
252 
253 /* Initialize an sctp_addr from a socket. */
254 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
255 {
256         addr->v4.sin_family = AF_INET;
257         addr->v4.sin_port = 0;
258         addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
259 }
260 
261 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
262 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
263 {
264         inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
265 }
266 
267 /* Initialize sk->sk_daddr from sctp_addr. */
268 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
269 {
270         inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
271 }
272 
273 /* Initialize a sctp_addr from an address parameter. */
274 static void sctp_v4_from_addr_param(union sctp_addr *addr,
275                                     union sctp_addr_param *param,
276                                     __be16 port, int iif)
277 {
278         addr->v4.sin_family = AF_INET;
279         addr->v4.sin_port = port;
280         addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
281 }
282 
283 /* Initialize an address parameter from a sctp_addr and return the length
284  * of the address parameter.
285  */
286 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
287                                  union sctp_addr_param *param)
288 {
289         int length = sizeof(sctp_ipv4addr_param_t);
290 
291         param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
292         param->v4.param_hdr.length = htons(length);
293         param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
294 
295         return length;
296 }
297 
298 /* Initialize a sctp_addr from a dst_entry. */
299 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
300                               __be16 port)
301 {
302         saddr->v4.sin_family = AF_INET;
303         saddr->v4.sin_port = port;
304         saddr->v4.sin_addr.s_addr = fl4->saddr;
305 }
306 
307 /* Compare two addresses exactly. */
308 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
309                             const union sctp_addr *addr2)
310 {
311         if (addr1->sa.sa_family != addr2->sa.sa_family)
312                 return 0;
313         if (addr1->v4.sin_port != addr2->v4.sin_port)
314                 return 0;
315         if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
316                 return 0;
317 
318         return 1;
319 }
320 
321 /* Initialize addr struct to INADDR_ANY. */
322 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
323 {
324         addr->v4.sin_family = AF_INET;
325         addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
326         addr->v4.sin_port = port;
327 }
328 
329 /* Is this a wildcard address? */
330 static int sctp_v4_is_any(const union sctp_addr *addr)
331 {
332         return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
333 }
334 
335 /* This function checks if the address is a valid address to be used for
336  * SCTP binding.
337  *
338  * Output:
339  * Return 0 - If the address is a non-unicast or an illegal address.
340  * Return 1 - If the address is a unicast.
341  */
342 static int sctp_v4_addr_valid(union sctp_addr *addr,
343                               struct sctp_sock *sp,
344                               const struct sk_buff *skb)
345 {
346         /* IPv4 addresses not allowed */
347         if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
348                 return 0;
349 
350         /* Is this a non-unicast address or a unusable SCTP address? */
351         if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
352                 return 0;
353 
354         /* Is this a broadcast address? */
355         if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
356                 return 0;
357 
358         return 1;
359 }
360 
361 /* Should this be available for binding?   */
362 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
363 {
364         struct net *net = sock_net(&sp->inet.sk);
365         int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
366 
367 
368         if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
369            ret != RTN_LOCAL &&
370            !sp->inet.freebind &&
371            !net->ipv4.sysctl_ip_nonlocal_bind)
372                 return 0;
373 
374         if (ipv6_only_sock(sctp_opt2sk(sp)))
375                 return 0;
376 
377         return 1;
378 }
379 
380 /* Checking the loopback, private and other address scopes as defined in
381  * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
382  * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
383  *
384  * Level 0 - unusable SCTP addresses
385  * Level 1 - loopback address
386  * Level 2 - link-local addresses
387  * Level 3 - private addresses.
388  * Level 4 - global addresses
389  * For INIT and INIT-ACK address list, let L be the level of
390  * of requested destination address, sender and receiver
391  * SHOULD include all of its addresses with level greater
392  * than or equal to L.
393  *
394  * IPv4 scoping can be controlled through sysctl option
395  * net.sctp.addr_scope_policy
396  */
397 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
398 {
399         sctp_scope_t retval;
400 
401         /* Check for unusable SCTP addresses. */
402         if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
403                 retval =  SCTP_SCOPE_UNUSABLE;
404         } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
405                 retval = SCTP_SCOPE_LOOPBACK;
406         } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
407                 retval = SCTP_SCOPE_LINK;
408         } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
409                    ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
410                    ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
411                 retval = SCTP_SCOPE_PRIVATE;
412         } else {
413                 retval = SCTP_SCOPE_GLOBAL;
414         }
415 
416         return retval;
417 }
418 
419 /* Returns a valid dst cache entry for the given source and destination ip
420  * addresses. If an association is passed, trys to get a dst entry with a
421  * source address that matches an address in the bind address list.
422  */
423 static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
424                                 struct flowi *fl, struct sock *sk)
425 {
426         struct sctp_association *asoc = t->asoc;
427         struct rtable *rt;
428         struct flowi4 *fl4 = &fl->u.ip4;
429         struct sctp_bind_addr *bp;
430         struct sctp_sockaddr_entry *laddr;
431         struct dst_entry *dst = NULL;
432         union sctp_addr *daddr = &t->ipaddr;
433         union sctp_addr dst_saddr;
434 
435         memset(fl4, 0x0, sizeof(struct flowi4));
436         fl4->daddr  = daddr->v4.sin_addr.s_addr;
437         fl4->fl4_dport = daddr->v4.sin_port;
438         fl4->flowi4_proto = IPPROTO_SCTP;
439         if (asoc) {
440                 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
441                 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
442                 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
443         }
444         if (saddr) {
445                 fl4->saddr = saddr->v4.sin_addr.s_addr;
446                 fl4->fl4_sport = saddr->v4.sin_port;
447         }
448 
449         pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
450                  &fl4->saddr);
451 
452         rt = ip_route_output_key(sock_net(sk), fl4);
453         if (!IS_ERR(rt))
454                 dst = &rt->dst;
455 
456         /* If there is no association or if a source address is passed, no
457          * more validation is required.
458          */
459         if (!asoc || saddr)
460                 goto out;
461 
462         bp = &asoc->base.bind_addr;
463 
464         if (dst) {
465                 /* Walk through the bind address list and look for a bind
466                  * address that matches the source address of the returned dst.
467                  */
468                 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
469                 rcu_read_lock();
470                 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
471                         if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
472                             (laddr->state != SCTP_ADDR_SRC &&
473                             !asoc->src_out_of_asoc_ok))
474                                 continue;
475                         if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
476                                 goto out_unlock;
477                 }
478                 rcu_read_unlock();
479 
480                 /* None of the bound addresses match the source address of the
481                  * dst. So release it.
482                  */
483                 dst_release(dst);
484                 dst = NULL;
485         }
486 
487         /* Walk through the bind address list and try to get a dst that
488          * matches a bind address as the source address.
489          */
490         rcu_read_lock();
491         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
492                 if (!laddr->valid)
493                         continue;
494                 if ((laddr->state == SCTP_ADDR_SRC) &&
495                     (AF_INET == laddr->a.sa.sa_family)) {
496                         fl4->fl4_sport = laddr->a.v4.sin_port;
497                         flowi4_update_output(fl4,
498                                              asoc->base.sk->sk_bound_dev_if,
499                                              RT_CONN_FLAGS(asoc->base.sk),
500                                              daddr->v4.sin_addr.s_addr,
501                                              laddr->a.v4.sin_addr.s_addr);
502 
503                         rt = ip_route_output_key(sock_net(sk), fl4);
504                         if (!IS_ERR(rt)) {
505                                 dst = &rt->dst;
506                                 goto out_unlock;
507                         }
508                 }
509         }
510 
511 out_unlock:
512         rcu_read_unlock();
513 out:
514         t->dst = dst;
515         if (dst)
516                 pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
517                          &fl4->daddr, &fl4->saddr);
518         else
519                 pr_debug("no route\n");
520 }
521 
522 /* For v4, the source address is cached in the route entry(dst). So no need
523  * to cache it separately and hence this is an empty routine.
524  */
525 static void sctp_v4_get_saddr(struct sctp_sock *sk,
526                               struct sctp_transport *t,
527                               struct flowi *fl)
528 {
529         union sctp_addr *saddr = &t->saddr;
530         struct rtable *rt = (struct rtable *)t->dst;
531 
532         if (rt) {
533                 saddr->v4.sin_family = AF_INET;
534                 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
535         }
536 }
537 
538 /* What interface did this skb arrive on? */
539 static int sctp_v4_skb_iif(const struct sk_buff *skb)
540 {
541         return inet_iif(skb);
542 }
543 
544 /* Was this packet marked by Explicit Congestion Notification? */
545 static int sctp_v4_is_ce(const struct sk_buff *skb)
546 {
547         return INET_ECN_is_ce(ip_hdr(skb)->tos);
548 }
549 
550 /* Create and initialize a new sk for the socket returned by accept(). */
551 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
552                                              struct sctp_association *asoc)
553 {
554         struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
555                         sk->sk_prot);
556         struct inet_sock *newinet;
557 
558         if (!newsk)
559                 goto out;
560 
561         sock_init_data(NULL, newsk);
562 
563         sctp_copy_sock(newsk, sk, asoc);
564         sock_reset_flag(newsk, SOCK_ZAPPED);
565 
566         newinet = inet_sk(newsk);
567 
568         newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
569 
570         sk_refcnt_debug_inc(newsk);
571 
572         if (newsk->sk_prot->init(newsk)) {
573                 sk_common_release(newsk);
574                 newsk = NULL;
575         }
576 
577 out:
578         return newsk;
579 }
580 
581 static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
582 {
583         /* No address mapping for V4 sockets */
584         return sizeof(struct sockaddr_in);
585 }
586 
587 /* Dump the v4 addr to the seq file. */
588 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
589 {
590         seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
591 }
592 
593 static void sctp_v4_ecn_capable(struct sock *sk)
594 {
595         INET_ECN_xmit(sk);
596 }
597 
598 static void sctp_addr_wq_timeout_handler(unsigned long arg)
599 {
600         struct net *net = (struct net *)arg;
601         struct sctp_sockaddr_entry *addrw, *temp;
602         struct sctp_sock *sp;
603 
604         spin_lock_bh(&net->sctp.addr_wq_lock);
605 
606         list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
607                 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
608                          "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
609                          addrw->state, addrw);
610 
611 #if IS_ENABLED(CONFIG_IPV6)
612                 /* Now we send an ASCONF for each association */
613                 /* Note. we currently don't handle link local IPv6 addressees */
614                 if (addrw->a.sa.sa_family == AF_INET6) {
615                         struct in6_addr *in6;
616 
617                         if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
618                             IPV6_ADDR_LINKLOCAL)
619                                 goto free_next;
620 
621                         in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
622                         if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
623                             addrw->state == SCTP_ADDR_NEW) {
624                                 unsigned long timeo_val;
625 
626                                 pr_debug("%s: this is on DAD, trying %d sec "
627                                          "later\n", __func__,
628                                          SCTP_ADDRESS_TICK_DELAY);
629 
630                                 timeo_val = jiffies;
631                                 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
632                                 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
633                                 break;
634                         }
635                 }
636 #endif
637                 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
638                         struct sock *sk;
639 
640                         sk = sctp_opt2sk(sp);
641                         /* ignore bound-specific endpoints */
642                         if (!sctp_is_ep_boundall(sk))
643                                 continue;
644                         bh_lock_sock(sk);
645                         if (sctp_asconf_mgmt(sp, addrw) < 0)
646                                 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
647                         bh_unlock_sock(sk);
648                 }
649 #if IS_ENABLED(CONFIG_IPV6)
650 free_next:
651 #endif
652                 list_del(&addrw->list);
653                 kfree(addrw);
654         }
655         spin_unlock_bh(&net->sctp.addr_wq_lock);
656 }
657 
658 static void sctp_free_addr_wq(struct net *net)
659 {
660         struct sctp_sockaddr_entry *addrw;
661         struct sctp_sockaddr_entry *temp;
662 
663         spin_lock_bh(&net->sctp.addr_wq_lock);
664         del_timer(&net->sctp.addr_wq_timer);
665         list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
666                 list_del(&addrw->list);
667                 kfree(addrw);
668         }
669         spin_unlock_bh(&net->sctp.addr_wq_lock);
670 }
671 
672 /* lookup the entry for the same address in the addr_waitq
673  * sctp_addr_wq MUST be locked
674  */
675 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
676                                         struct sctp_sockaddr_entry *addr)
677 {
678         struct sctp_sockaddr_entry *addrw;
679 
680         list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
681                 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
682                         continue;
683                 if (addrw->a.sa.sa_family == AF_INET) {
684                         if (addrw->a.v4.sin_addr.s_addr ==
685                             addr->a.v4.sin_addr.s_addr)
686                                 return addrw;
687                 } else if (addrw->a.sa.sa_family == AF_INET6) {
688                         if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
689                             &addr->a.v6.sin6_addr))
690                                 return addrw;
691                 }
692         }
693         return NULL;
694 }
695 
696 void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
697 {
698         struct sctp_sockaddr_entry *addrw;
699         unsigned long timeo_val;
700 
701         /* first, we check if an opposite message already exist in the queue.
702          * If we found such message, it is removed.
703          * This operation is a bit stupid, but the DHCP client attaches the
704          * new address after a couple of addition and deletion of that address
705          */
706 
707         spin_lock_bh(&net->sctp.addr_wq_lock);
708         /* Offsets existing events in addr_wq */
709         addrw = sctp_addr_wq_lookup(net, addr);
710         if (addrw) {
711                 if (addrw->state != cmd) {
712                         pr_debug("%s: offsets existing entry for %d, addr:%pISc "
713                                  "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
714                                  &net->sctp.addr_waitq);
715 
716                         list_del(&addrw->list);
717                         kfree(addrw);
718                 }
719                 spin_unlock_bh(&net->sctp.addr_wq_lock);
720                 return;
721         }
722 
723         /* OK, we have to add the new address to the wait queue */
724         addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
725         if (addrw == NULL) {
726                 spin_unlock_bh(&net->sctp.addr_wq_lock);
727                 return;
728         }
729         addrw->state = cmd;
730         list_add_tail(&addrw->list, &net->sctp.addr_waitq);
731 
732         pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
733                  __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
734 
735         if (!timer_pending(&net->sctp.addr_wq_timer)) {
736                 timeo_val = jiffies;
737                 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
738                 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
739         }
740         spin_unlock_bh(&net->sctp.addr_wq_lock);
741 }
742 
743 /* Event handler for inet address addition/deletion events.
744  * The sctp_local_addr_list needs to be protocted by a spin lock since
745  * multiple notifiers (say IPv4 and IPv6) may be running at the same
746  * time and thus corrupt the list.
747  * The reader side is protected with RCU.
748  */
749 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
750                                void *ptr)
751 {
752         struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
753         struct sctp_sockaddr_entry *addr = NULL;
754         struct sctp_sockaddr_entry *temp;
755         struct net *net = dev_net(ifa->ifa_dev->dev);
756         int found = 0;
757 
758         switch (ev) {
759         case NETDEV_UP:
760                 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
761                 if (addr) {
762                         addr->a.v4.sin_family = AF_INET;
763                         addr->a.v4.sin_port = 0;
764                         addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
765                         addr->valid = 1;
766                         spin_lock_bh(&net->sctp.local_addr_lock);
767                         list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
768                         sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
769                         spin_unlock_bh(&net->sctp.local_addr_lock);
770                 }
771                 break;
772         case NETDEV_DOWN:
773                 spin_lock_bh(&net->sctp.local_addr_lock);
774                 list_for_each_entry_safe(addr, temp,
775                                         &net->sctp.local_addr_list, list) {
776                         if (addr->a.sa.sa_family == AF_INET &&
777                                         addr->a.v4.sin_addr.s_addr ==
778                                         ifa->ifa_local) {
779                                 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
780                                 found = 1;
781                                 addr->valid = 0;
782                                 list_del_rcu(&addr->list);
783                                 break;
784                         }
785                 }
786                 spin_unlock_bh(&net->sctp.local_addr_lock);
787                 if (found)
788                         kfree_rcu(addr, rcu);
789                 break;
790         }
791 
792         return NOTIFY_DONE;
793 }
794 
795 /*
796  * Initialize the control inode/socket with a control endpoint data
797  * structure.  This endpoint is reserved exclusively for the OOTB processing.
798  */
799 static int sctp_ctl_sock_init(struct net *net)
800 {
801         int err;
802         sa_family_t family = PF_INET;
803 
804         if (sctp_get_pf_specific(PF_INET6))
805                 family = PF_INET6;
806 
807         err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
808                                    SOCK_SEQPACKET, IPPROTO_SCTP, net);
809 
810         /* If IPv6 socket could not be created, try the IPv4 socket */
811         if (err < 0 && family == PF_INET6)
812                 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
813                                            SOCK_SEQPACKET, IPPROTO_SCTP,
814                                            net);
815 
816         if (err < 0) {
817                 pr_err("Failed to create the SCTP control socket\n");
818                 return err;
819         }
820         return 0;
821 }
822 
823 /* Register address family specific functions. */
824 int sctp_register_af(struct sctp_af *af)
825 {
826         switch (af->sa_family) {
827         case AF_INET:
828                 if (sctp_af_v4_specific)
829                         return 0;
830                 sctp_af_v4_specific = af;
831                 break;
832         case AF_INET6:
833                 if (sctp_af_v6_specific)
834                         return 0;
835                 sctp_af_v6_specific = af;
836                 break;
837         default:
838                 return 0;
839         }
840 
841         INIT_LIST_HEAD(&af->list);
842         list_add_tail(&af->list, &sctp_address_families);
843         return 1;
844 }
845 
846 /* Get the table of functions for manipulating a particular address
847  * family.
848  */
849 struct sctp_af *sctp_get_af_specific(sa_family_t family)
850 {
851         switch (family) {
852         case AF_INET:
853                 return sctp_af_v4_specific;
854         case AF_INET6:
855                 return sctp_af_v6_specific;
856         default:
857                 return NULL;
858         }
859 }
860 
861 /* Common code to initialize a AF_INET msg_name. */
862 static void sctp_inet_msgname(char *msgname, int *addr_len)
863 {
864         struct sockaddr_in *sin;
865 
866         sin = (struct sockaddr_in *)msgname;
867         *addr_len = sizeof(struct sockaddr_in);
868         sin->sin_family = AF_INET;
869         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
870 }
871 
872 /* Copy the primary address of the peer primary address as the msg_name. */
873 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
874                                     int *addr_len)
875 {
876         struct sockaddr_in *sin, *sinfrom;
877 
878         if (msgname) {
879                 struct sctp_association *asoc;
880 
881                 asoc = event->asoc;
882                 sctp_inet_msgname(msgname, addr_len);
883                 sin = (struct sockaddr_in *)msgname;
884                 sinfrom = &asoc->peer.primary_addr.v4;
885                 sin->sin_port = htons(asoc->peer.port);
886                 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
887         }
888 }
889 
890 /* Initialize and copy out a msgname from an inbound skb. */
891 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
892 {
893         if (msgname) {
894                 struct sctphdr *sh = sctp_hdr(skb);
895                 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
896 
897                 sctp_inet_msgname(msgname, len);
898                 sin->sin_port = sh->source;
899                 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
900         }
901 }
902 
903 /* Do we support this AF? */
904 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
905 {
906         /* PF_INET only supports AF_INET addresses. */
907         return AF_INET == family;
908 }
909 
910 /* Address matching with wildcards allowed. */
911 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
912                               const union sctp_addr *addr2,
913                               struct sctp_sock *opt)
914 {
915         /* PF_INET only supports AF_INET addresses. */
916         if (addr1->sa.sa_family != addr2->sa.sa_family)
917                 return 0;
918         if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
919             htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
920                 return 1;
921         if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
922                 return 1;
923 
924         return 0;
925 }
926 
927 /* Verify that provided sockaddr looks bindable.  Common verification has
928  * already been taken care of.
929  */
930 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
931 {
932         return sctp_v4_available(addr, opt);
933 }
934 
935 /* Verify that sockaddr looks sendable.  Common verification has already
936  * been taken care of.
937  */
938 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
939 {
940         return 1;
941 }
942 
943 /* Fill in Supported Address Type information for INIT and INIT-ACK
944  * chunks.  Returns number of addresses supported.
945  */
946 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
947                                      __be16 *types)
948 {
949         types[0] = SCTP_PARAM_IPV4_ADDRESS;
950         return 1;
951 }
952 
953 /* Wrapper routine that calls the ip transmit routine. */
954 static inline int sctp_v4_xmit(struct sk_buff *skb,
955                                struct sctp_transport *transport)
956 {
957         struct inet_sock *inet = inet_sk(skb->sk);
958 
959         pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
960                  skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr);
961 
962         inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
963                          IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
964 
965         SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
966 
967         return ip_queue_xmit(&inet->sk, skb, &transport->fl);
968 }
969 
970 static struct sctp_af sctp_af_inet;
971 
972 static struct sctp_pf sctp_pf_inet = {
973         .event_msgname = sctp_inet_event_msgname,
974         .skb_msgname   = sctp_inet_skb_msgname,
975         .af_supported  = sctp_inet_af_supported,
976         .cmp_addr      = sctp_inet_cmp_addr,
977         .bind_verify   = sctp_inet_bind_verify,
978         .send_verify   = sctp_inet_send_verify,
979         .supported_addrs = sctp_inet_supported_addrs,
980         .create_accept_sk = sctp_v4_create_accept_sk,
981         .addr_to_user  = sctp_v4_addr_to_user,
982         .to_sk_saddr   = sctp_v4_to_sk_saddr,
983         .to_sk_daddr   = sctp_v4_to_sk_daddr,
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         .flags      = SCTP_PROTOSW_FLAG
1025 };
1026 static struct inet_protosw sctp_stream_protosw = {
1027         .type       = SOCK_STREAM,
1028         .protocol   = IPPROTO_SCTP,
1029         .prot       = &sctp_prot,
1030         .ops        = &inet_seqpacket_ops,
1031         .flags      = SCTP_PROTOSW_FLAG
1032 };
1033 
1034 /* Register with IP layer.  */
1035 static const struct net_protocol sctp_protocol = {
1036         .handler     = sctp_rcv,
1037         .err_handler = sctp_v4_err,
1038         .no_policy   = 1,
1039         .netns_ok    = 1,
1040         .icmp_strict_tag_validation = 1,
1041 };
1042 
1043 /* IPv4 address related functions.  */
1044 static struct sctp_af sctp_af_inet = {
1045         .sa_family         = AF_INET,
1046         .sctp_xmit         = sctp_v4_xmit,
1047         .setsockopt        = ip_setsockopt,
1048         .getsockopt        = ip_getsockopt,
1049         .get_dst           = sctp_v4_get_dst,
1050         .get_saddr         = sctp_v4_get_saddr,
1051         .copy_addrlist     = sctp_v4_copy_addrlist,
1052         .from_skb          = sctp_v4_from_skb,
1053         .from_sk           = sctp_v4_from_sk,
1054         .from_addr_param   = sctp_v4_from_addr_param,
1055         .to_addr_param     = sctp_v4_to_addr_param,
1056         .cmp_addr          = sctp_v4_cmp_addr,
1057         .addr_valid        = sctp_v4_addr_valid,
1058         .inaddr_any        = sctp_v4_inaddr_any,
1059         .is_any            = sctp_v4_is_any,
1060         .available         = sctp_v4_available,
1061         .scope             = sctp_v4_scope,
1062         .skb_iif           = sctp_v4_skb_iif,
1063         .is_ce             = sctp_v4_is_ce,
1064         .seq_dump_addr     = sctp_v4_seq_dump_addr,
1065         .ecn_capable       = sctp_v4_ecn_capable,
1066         .net_header_len    = sizeof(struct iphdr),
1067         .sockaddr_len      = sizeof(struct sockaddr_in),
1068 #ifdef CONFIG_COMPAT
1069         .compat_setsockopt = compat_ip_setsockopt,
1070         .compat_getsockopt = compat_ip_getsockopt,
1071 #endif
1072 };
1073 
1074 struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
1075 {
1076         switch (family) {
1077         case PF_INET:
1078                 return sctp_pf_inet_specific;
1079         case PF_INET6:
1080                 return sctp_pf_inet6_specific;
1081         default:
1082                 return NULL;
1083         }
1084 }
1085 
1086 /* Register the PF specific function table.  */
1087 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1088 {
1089         switch (family) {
1090         case PF_INET:
1091                 if (sctp_pf_inet_specific)
1092                         return 0;
1093                 sctp_pf_inet_specific = pf;
1094                 break;
1095         case PF_INET6:
1096                 if (sctp_pf_inet6_specific)
1097                         return 0;
1098                 sctp_pf_inet6_specific = pf;
1099                 break;
1100         default:
1101                 return 0;
1102         }
1103         return 1;
1104 }
1105 
1106 static inline int init_sctp_mibs(struct net *net)
1107 {
1108         net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib);
1109         if (!net->sctp.sctp_statistics)
1110                 return -ENOMEM;
1111         return 0;
1112 }
1113 
1114 static inline void cleanup_sctp_mibs(struct net *net)
1115 {
1116         free_percpu(net->sctp.sctp_statistics);
1117 }
1118 
1119 static void sctp_v4_pf_init(void)
1120 {
1121         /* Initialize the SCTP specific PF functions. */
1122         sctp_register_pf(&sctp_pf_inet, PF_INET);
1123         sctp_register_af(&sctp_af_inet);
1124 }
1125 
1126 static void sctp_v4_pf_exit(void)
1127 {
1128         list_del(&sctp_af_inet.list);
1129 }
1130 
1131 static int sctp_v4_protosw_init(void)
1132 {
1133         int rc;
1134 
1135         rc = proto_register(&sctp_prot, 1);
1136         if (rc)
1137                 return rc;
1138 
1139         /* Register SCTP(UDP and TCP style) with socket layer.  */
1140         inet_register_protosw(&sctp_seqpacket_protosw);
1141         inet_register_protosw(&sctp_stream_protosw);
1142 
1143         return 0;
1144 }
1145 
1146 static void sctp_v4_protosw_exit(void)
1147 {
1148         inet_unregister_protosw(&sctp_stream_protosw);
1149         inet_unregister_protosw(&sctp_seqpacket_protosw);
1150         proto_unregister(&sctp_prot);
1151 }
1152 
1153 static int sctp_v4_add_protocol(void)
1154 {
1155         /* Register notifier for inet address additions/deletions. */
1156         register_inetaddr_notifier(&sctp_inetaddr_notifier);
1157 
1158         /* Register SCTP with inet layer.  */
1159         if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1160                 return -EAGAIN;
1161 
1162         return 0;
1163 }
1164 
1165 static void sctp_v4_del_protocol(void)
1166 {
1167         inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1168         unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1169 }
1170 
1171 static int __net_init sctp_defaults_init(struct net *net)
1172 {
1173         int status;
1174 
1175         /*
1176          * 14. Suggested SCTP Protocol Parameter Values
1177          */
1178         /* The following protocol parameters are RECOMMENDED:  */
1179         /* RTO.Initial              - 3  seconds */
1180         net->sctp.rto_initial                   = SCTP_RTO_INITIAL;
1181         /* RTO.Min                  - 1  second */
1182         net->sctp.rto_min                       = SCTP_RTO_MIN;
1183         /* RTO.Max                 -  60 seconds */
1184         net->sctp.rto_max                       = SCTP_RTO_MAX;
1185         /* RTO.Alpha                - 1/8 */
1186         net->sctp.rto_alpha                     = SCTP_RTO_ALPHA;
1187         /* RTO.Beta                 - 1/4 */
1188         net->sctp.rto_beta                      = SCTP_RTO_BETA;
1189 
1190         /* Valid.Cookie.Life        - 60  seconds */
1191         net->sctp.valid_cookie_life             = SCTP_DEFAULT_COOKIE_LIFE;
1192 
1193         /* Whether Cookie Preservative is enabled(1) or not(0) */
1194         net->sctp.cookie_preserve_enable        = 1;
1195 
1196         /* Default sctp sockets to use md5 as their hmac alg */
1197 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1198         net->sctp.sctp_hmac_alg                 = "md5";
1199 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1200         net->sctp.sctp_hmac_alg                 = "sha1";
1201 #else
1202         net->sctp.sctp_hmac_alg                 = NULL;
1203 #endif
1204 
1205         /* Max.Burst                - 4 */
1206         net->sctp.max_burst                     = SCTP_DEFAULT_MAX_BURST;
1207 
1208         /* Association.Max.Retrans  - 10 attempts
1209          * Path.Max.Retrans         - 5  attempts (per destination address)
1210          * Max.Init.Retransmits     - 8  attempts
1211          */
1212         net->sctp.max_retrans_association       = 10;
1213         net->sctp.max_retrans_path              = 5;
1214         net->sctp.max_retrans_init              = 8;
1215 
1216         /* Sendbuffer growth        - do per-socket accounting */
1217         net->sctp.sndbuf_policy                 = 0;
1218 
1219         /* Rcvbuffer growth         - do per-socket accounting */
1220         net->sctp.rcvbuf_policy                 = 0;
1221 
1222         /* HB.interval              - 30 seconds */
1223         net->sctp.hb_interval                   = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1224 
1225         /* delayed SACK timeout */
1226         net->sctp.sack_timeout                  = SCTP_DEFAULT_TIMEOUT_SACK;
1227 
1228         /* Disable ADDIP by default. */
1229         net->sctp.addip_enable = 0;
1230         net->sctp.addip_noauth = 0;
1231         net->sctp.default_auto_asconf = 0;
1232 
1233         /* Enable PR-SCTP by default. */
1234         net->sctp.prsctp_enable = 1;
1235 
1236         /* Disable AUTH by default. */
1237         net->sctp.auth_enable = 0;
1238 
1239         /* Set SCOPE policy to enabled */
1240         net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1241 
1242         /* Set the default rwnd update threshold */
1243         net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1244 
1245         /* Initialize maximum autoclose timeout. */
1246         net->sctp.max_autoclose         = INT_MAX / HZ;
1247 
1248         status = sctp_sysctl_net_register(net);
1249         if (status)
1250                 goto err_sysctl_register;
1251 
1252         /* Allocate and initialise sctp mibs.  */
1253         status = init_sctp_mibs(net);
1254         if (status)
1255                 goto err_init_mibs;
1256 
1257         /* Initialize proc fs directory.  */
1258         status = sctp_proc_init(net);
1259         if (status)
1260                 goto err_init_proc;
1261 
1262         sctp_dbg_objcnt_init(net);
1263 
1264         /* Initialize the local address list. */
1265         INIT_LIST_HEAD(&net->sctp.local_addr_list);
1266         spin_lock_init(&net->sctp.local_addr_lock);
1267         sctp_get_local_addr_list(net);
1268 
1269         /* Initialize the address event list */
1270         INIT_LIST_HEAD(&net->sctp.addr_waitq);
1271         INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1272         spin_lock_init(&net->sctp.addr_wq_lock);
1273         net->sctp.addr_wq_timer.expires = 0;
1274         setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler,
1275                     (unsigned long)net);
1276 
1277         return 0;
1278 
1279 err_init_proc:
1280         cleanup_sctp_mibs(net);
1281 err_init_mibs:
1282         sctp_sysctl_net_unregister(net);
1283 err_sysctl_register:
1284         return status;
1285 }
1286 
1287 static void __net_exit sctp_defaults_exit(struct net *net)
1288 {
1289         /* Free the local address list */
1290         sctp_free_addr_wq(net);
1291         sctp_free_local_addr_list(net);
1292 
1293         sctp_dbg_objcnt_exit(net);
1294 
1295         sctp_proc_exit(net);
1296         cleanup_sctp_mibs(net);
1297         sctp_sysctl_net_unregister(net);
1298 }
1299 
1300 static struct pernet_operations sctp_defaults_ops = {
1301         .init = sctp_defaults_init,
1302         .exit = sctp_defaults_exit,
1303 };
1304 
1305 static int __net_init sctp_ctrlsock_init(struct net *net)
1306 {
1307         int status;
1308 
1309         /* Initialize the control inode/socket for handling OOTB packets.  */
1310         status = sctp_ctl_sock_init(net);
1311         if (status)
1312                 pr_err("Failed to initialize the SCTP control sock\n");
1313 
1314         return status;
1315 }
1316 
1317 static void __net_init sctp_ctrlsock_exit(struct net *net)
1318 {
1319         /* Free the control endpoint.  */
1320         inet_ctl_sock_destroy(net->sctp.ctl_sock);
1321 }
1322 
1323 static struct pernet_operations sctp_ctrlsock_ops = {
1324         .init = sctp_ctrlsock_init,
1325         .exit = sctp_ctrlsock_exit,
1326 };
1327 
1328 /* Initialize the universe into something sensible.  */
1329 static __init int sctp_init(void)
1330 {
1331         int i;
1332         int status = -EINVAL;
1333         unsigned long goal;
1334         unsigned long limit;
1335         int max_share;
1336         int order;
1337         int num_entries;
1338         int max_entry_order;
1339 
1340         sock_skb_cb_check_size(sizeof(struct sctp_ulpevent));
1341 
1342         /* Allocate bind_bucket and chunk caches. */
1343         status = -ENOBUFS;
1344         sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1345                                                sizeof(struct sctp_bind_bucket),
1346                                                0, SLAB_HWCACHE_ALIGN,
1347                                                NULL);
1348         if (!sctp_bucket_cachep)
1349                 goto out;
1350 
1351         sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1352                                                sizeof(struct sctp_chunk),
1353                                                0, SLAB_HWCACHE_ALIGN,
1354                                                NULL);
1355         if (!sctp_chunk_cachep)
1356                 goto err_chunk_cachep;
1357 
1358         status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL);
1359         if (status)
1360                 goto err_percpu_counter_init;
1361 
1362         /* Implementation specific variables. */
1363 
1364         /* Initialize default stream count setup information. */
1365         sctp_max_instreams              = SCTP_DEFAULT_INSTREAMS;
1366         sctp_max_outstreams             = SCTP_DEFAULT_OUTSTREAMS;
1367 
1368         /* Initialize handle used for association ids. */
1369         idr_init(&sctp_assocs_id);
1370 
1371         limit = nr_free_buffer_pages() / 8;
1372         limit = max(limit, 128UL);
1373         sysctl_sctp_mem[0] = limit / 4 * 3;
1374         sysctl_sctp_mem[1] = limit;
1375         sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1376 
1377         /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1378         limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1379         max_share = min(4UL*1024*1024, limit);
1380 
1381         sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1382         sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1383         sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1384 
1385         sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1386         sysctl_sctp_wmem[1] = 16*1024;
1387         sysctl_sctp_wmem[2] = max(64*1024, max_share);
1388 
1389         /* Size and allocate the association hash table.
1390          * The methodology is similar to that of the tcp hash tables.
1391          * Though not identical.  Start by getting a goal size
1392          */
1393         if (totalram_pages >= (128 * 1024))
1394                 goal = totalram_pages >> (22 - PAGE_SHIFT);
1395         else
1396                 goal = totalram_pages >> (24 - PAGE_SHIFT);
1397 
1398         /* Then compute the page order for said goal */
1399         order = get_order(goal);
1400 
1401         /* Now compute the required page order for the maximum sized table we
1402          * want to create
1403          */
1404         max_entry_order = get_order(MAX_SCTP_PORT_HASH_ENTRIES *
1405                                     sizeof(struct sctp_bind_hashbucket));
1406 
1407         /* Limit the page order by that maximum hash table size */
1408         order = min(order, max_entry_order);
1409 
1410         do {
1411                 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1412                                         sizeof(struct sctp_hashbucket);
1413                 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1414                         continue;
1415                 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1416                         __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1417         } while (!sctp_assoc_hashtable && --order > 0);
1418         if (!sctp_assoc_hashtable) {
1419                 pr_err("Failed association hash alloc\n");
1420                 status = -ENOMEM;
1421                 goto err_ahash_alloc;
1422         }
1423         for (i = 0; i < sctp_assoc_hashsize; i++) {
1424                 rwlock_init(&sctp_assoc_hashtable[i].lock);
1425                 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
1426         }
1427 
1428         /* Allocate and initialize the endpoint hash table.  */
1429         sctp_ep_hashsize = 64;
1430         sctp_ep_hashtable =
1431                 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1432         if (!sctp_ep_hashtable) {
1433                 pr_err("Failed endpoint_hash alloc\n");
1434                 status = -ENOMEM;
1435                 goto err_ehash_alloc;
1436         }
1437         for (i = 0; i < sctp_ep_hashsize; i++) {
1438                 rwlock_init(&sctp_ep_hashtable[i].lock);
1439                 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1440         }
1441 
1442         /* Allocate and initialize the SCTP port hash table.
1443          * Note that order is initalized to start at the max sized
1444          * table we want to support.  If we can't get that many pages
1445          * reduce the order and try again
1446          */
1447         do {
1448                 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1449                         __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1450         } while (!sctp_port_hashtable && --order > 0);
1451 
1452         if (!sctp_port_hashtable) {
1453                 pr_err("Failed bind hash alloc\n");
1454                 status = -ENOMEM;
1455                 goto err_bhash_alloc;
1456         }
1457 
1458         /* Now compute the number of entries that will fit in the
1459          * port hash space we allocated
1460          */
1461         num_entries = (1UL << order) * PAGE_SIZE /
1462                       sizeof(struct sctp_bind_hashbucket);
1463 
1464         /* And finish by rounding it down to the nearest power of two
1465          * this wastes some memory of course, but its needed because
1466          * the hash function operates based on the assumption that
1467          * that the number of entries is a power of two
1468          */
1469         sctp_port_hashsize = rounddown_pow_of_two(num_entries);
1470 
1471         for (i = 0; i < sctp_port_hashsize; i++) {
1472                 spin_lock_init(&sctp_port_hashtable[i].lock);
1473                 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1474         }
1475 
1476         pr_info("Hash tables configured (established %d bind %d/%d)\n",
1477                 sctp_assoc_hashsize, sctp_port_hashsize, num_entries);
1478 
1479         sctp_sysctl_register();
1480 
1481         INIT_LIST_HEAD(&sctp_address_families);
1482         sctp_v4_pf_init();
1483         sctp_v6_pf_init();
1484 
1485         status = register_pernet_subsys(&sctp_defaults_ops);
1486         if (status)
1487                 goto err_register_defaults;
1488 
1489         status = sctp_v4_protosw_init();
1490         if (status)
1491                 goto err_protosw_init;
1492 
1493         status = sctp_v6_protosw_init();
1494         if (status)
1495                 goto err_v6_protosw_init;
1496 
1497         status = register_pernet_subsys(&sctp_ctrlsock_ops);
1498         if (status)
1499                 goto err_register_ctrlsock;
1500 
1501         status = sctp_v4_add_protocol();
1502         if (status)
1503                 goto err_add_protocol;
1504 
1505         /* Register SCTP with inet6 layer.  */
1506         status = sctp_v6_add_protocol();
1507         if (status)
1508                 goto err_v6_add_protocol;
1509 
1510 out:
1511         return status;
1512 err_v6_add_protocol:
1513         sctp_v4_del_protocol();
1514 err_add_protocol:
1515         unregister_pernet_subsys(&sctp_ctrlsock_ops);
1516 err_register_ctrlsock:
1517         sctp_v6_protosw_exit();
1518 err_v6_protosw_init:
1519         sctp_v4_protosw_exit();
1520 err_protosw_init:
1521         unregister_pernet_subsys(&sctp_defaults_ops);
1522 err_register_defaults:
1523         sctp_v4_pf_exit();
1524         sctp_v6_pf_exit();
1525         sctp_sysctl_unregister();
1526         free_pages((unsigned long)sctp_port_hashtable,
1527                    get_order(sctp_port_hashsize *
1528                              sizeof(struct sctp_bind_hashbucket)));
1529 err_bhash_alloc:
1530         kfree(sctp_ep_hashtable);
1531 err_ehash_alloc:
1532         free_pages((unsigned long)sctp_assoc_hashtable,
1533                    get_order(sctp_assoc_hashsize *
1534                              sizeof(struct sctp_hashbucket)));
1535 err_ahash_alloc:
1536         percpu_counter_destroy(&sctp_sockets_allocated);
1537 err_percpu_counter_init:
1538         kmem_cache_destroy(sctp_chunk_cachep);
1539 err_chunk_cachep:
1540         kmem_cache_destroy(sctp_bucket_cachep);
1541         goto out;
1542 }
1543 
1544 /* Exit handler for the SCTP protocol.  */
1545 static __exit void sctp_exit(void)
1546 {
1547         /* BUG.  This should probably do something useful like clean
1548          * up all the remaining associations and all that memory.
1549          */
1550 
1551         /* Unregister with inet6/inet layers. */
1552         sctp_v6_del_protocol();
1553         sctp_v4_del_protocol();
1554 
1555         unregister_pernet_subsys(&sctp_ctrlsock_ops);
1556 
1557         /* Free protosw registrations */
1558         sctp_v6_protosw_exit();
1559         sctp_v4_protosw_exit();
1560 
1561         unregister_pernet_subsys(&sctp_defaults_ops);
1562 
1563         /* Unregister with socket layer. */
1564         sctp_v6_pf_exit();
1565         sctp_v4_pf_exit();
1566 
1567         sctp_sysctl_unregister();
1568 
1569         free_pages((unsigned long)sctp_assoc_hashtable,
1570                    get_order(sctp_assoc_hashsize *
1571                              sizeof(struct sctp_hashbucket)));
1572         kfree(sctp_ep_hashtable);
1573         free_pages((unsigned long)sctp_port_hashtable,
1574                    get_order(sctp_port_hashsize *
1575                              sizeof(struct sctp_bind_hashbucket)));
1576 
1577         percpu_counter_destroy(&sctp_sockets_allocated);
1578 
1579         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1580 
1581         kmem_cache_destroy(sctp_chunk_cachep);
1582         kmem_cache_destroy(sctp_bucket_cachep);
1583 }
1584 
1585 module_init(sctp_init);
1586 module_exit(sctp_exit);
1587 
1588 /*
1589  * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1590  */
1591 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1592 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1593 MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
1594 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1595 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1596 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1597 MODULE_LICENSE("GPL");
1598 

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