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

Version: ~ [ linux-5.6-rc1 ] ~ [ linux-5.5.2 ] ~ [ linux-5.4.17 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.102 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.170 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.213 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.213 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.81 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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         union sctp_addr laddr;
203         int error = 0;
204 
205         rcu_read_lock();
206         list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
207                 if (!addr->valid)
208                         continue;
209                 if (!sctp_in_scope(net, &addr->a, scope))
210                         continue;
211 
212                 /* Now that the address is in scope, check to see if
213                  * the address type is really supported by the local
214                  * sock as well as the remote peer.
215                  */
216                 if (addr->a.sa.sa_family == AF_INET &&
217                     !(copy_flags & SCTP_ADDR4_PEERSUPP))
218                         continue;
219                 if (addr->a.sa.sa_family == AF_INET6 &&
220                     (!(copy_flags & SCTP_ADDR6_ALLOWED) ||
221                      !(copy_flags & SCTP_ADDR6_PEERSUPP)))
222                         continue;
223 
224                 laddr = addr->a;
225                 /* also works for setting ipv6 address port */
226                 laddr.v4.sin_port = htons(bp->port);
227                 if (sctp_bind_addr_state(bp, &laddr) != -1)
228                         continue;
229 
230                 error = sctp_add_bind_addr(bp, &addr->a, sizeof(addr->a),
231                                            SCTP_ADDR_SRC, GFP_ATOMIC);
232                 if (error)
233                         break;
234         }
235 
236         rcu_read_unlock();
237         return error;
238 }
239 
240 /* Initialize a sctp_addr from in incoming skb.  */
241 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
242                              int is_saddr)
243 {
244         /* Always called on head skb, so this is safe */
245         struct sctphdr *sh = sctp_hdr(skb);
246         struct sockaddr_in *sa = &addr->v4;
247 
248         addr->v4.sin_family = AF_INET;
249 
250         if (is_saddr) {
251                 sa->sin_port = sh->source;
252                 sa->sin_addr.s_addr = ip_hdr(skb)->saddr;
253         } else {
254                 sa->sin_port = sh->dest;
255                 sa->sin_addr.s_addr = ip_hdr(skb)->daddr;
256         }
257 }
258 
259 /* Initialize an sctp_addr from a socket. */
260 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
261 {
262         addr->v4.sin_family = AF_INET;
263         addr->v4.sin_port = 0;
264         addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
265 }
266 
267 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
268 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
269 {
270         inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
271 }
272 
273 /* Initialize sk->sk_daddr from sctp_addr. */
274 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
275 {
276         inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
277 }
278 
279 /* Initialize a sctp_addr from an address parameter. */
280 static void sctp_v4_from_addr_param(union sctp_addr *addr,
281                                     union sctp_addr_param *param,
282                                     __be16 port, int iif)
283 {
284         addr->v4.sin_family = AF_INET;
285         addr->v4.sin_port = port;
286         addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
287 }
288 
289 /* Initialize an address parameter from a sctp_addr and return the length
290  * of the address parameter.
291  */
292 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
293                                  union sctp_addr_param *param)
294 {
295         int length = sizeof(sctp_ipv4addr_param_t);
296 
297         param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
298         param->v4.param_hdr.length = htons(length);
299         param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
300 
301         return length;
302 }
303 
304 /* Initialize a sctp_addr from a dst_entry. */
305 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
306                               __be16 port)
307 {
308         saddr->v4.sin_family = AF_INET;
309         saddr->v4.sin_port = port;
310         saddr->v4.sin_addr.s_addr = fl4->saddr;
311 }
312 
313 /* Compare two addresses exactly. */
314 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
315                             const union sctp_addr *addr2)
316 {
317         if (addr1->sa.sa_family != addr2->sa.sa_family)
318                 return 0;
319         if (addr1->v4.sin_port != addr2->v4.sin_port)
320                 return 0;
321         if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
322                 return 0;
323 
324         return 1;
325 }
326 
327 /* Initialize addr struct to INADDR_ANY. */
328 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
329 {
330         addr->v4.sin_family = AF_INET;
331         addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
332         addr->v4.sin_port = port;
333 }
334 
335 /* Is this a wildcard address? */
336 static int sctp_v4_is_any(const union sctp_addr *addr)
337 {
338         return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
339 }
340 
341 /* This function checks if the address is a valid address to be used for
342  * SCTP binding.
343  *
344  * Output:
345  * Return 0 - If the address is a non-unicast or an illegal address.
346  * Return 1 - If the address is a unicast.
347  */
348 static int sctp_v4_addr_valid(union sctp_addr *addr,
349                               struct sctp_sock *sp,
350                               const struct sk_buff *skb)
351 {
352         /* IPv4 addresses not allowed */
353         if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
354                 return 0;
355 
356         /* Is this a non-unicast address or a unusable SCTP address? */
357         if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
358                 return 0;
359 
360         /* Is this a broadcast address? */
361         if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
362                 return 0;
363 
364         return 1;
365 }
366 
367 /* Should this be available for binding?   */
368 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
369 {
370         struct net *net = sock_net(&sp->inet.sk);
371         int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
372 
373 
374         if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
375            ret != RTN_LOCAL &&
376            !sp->inet.freebind &&
377            !net->ipv4.sysctl_ip_nonlocal_bind)
378                 return 0;
379 
380         if (ipv6_only_sock(sctp_opt2sk(sp)))
381                 return 0;
382 
383         return 1;
384 }
385 
386 /* Checking the loopback, private and other address scopes as defined in
387  * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
388  * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
389  *
390  * Level 0 - unusable SCTP addresses
391  * Level 1 - loopback address
392  * Level 2 - link-local addresses
393  * Level 3 - private addresses.
394  * Level 4 - global addresses
395  * For INIT and INIT-ACK address list, let L be the level of
396  * of requested destination address, sender and receiver
397  * SHOULD include all of its addresses with level greater
398  * than or equal to L.
399  *
400  * IPv4 scoping can be controlled through sysctl option
401  * net.sctp.addr_scope_policy
402  */
403 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
404 {
405         sctp_scope_t retval;
406 
407         /* Check for unusable SCTP addresses. */
408         if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
409                 retval =  SCTP_SCOPE_UNUSABLE;
410         } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
411                 retval = SCTP_SCOPE_LOOPBACK;
412         } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
413                 retval = SCTP_SCOPE_LINK;
414         } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
415                    ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
416                    ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
417                 retval = SCTP_SCOPE_PRIVATE;
418         } else {
419                 retval = SCTP_SCOPE_GLOBAL;
420         }
421 
422         return retval;
423 }
424 
425 /* Returns a valid dst cache entry for the given source and destination ip
426  * addresses. If an association is passed, trys to get a dst entry with a
427  * source address that matches an address in the bind address list.
428  */
429 static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
430                                 struct flowi *fl, struct sock *sk)
431 {
432         struct sctp_association *asoc = t->asoc;
433         struct rtable *rt;
434         struct flowi4 *fl4 = &fl->u.ip4;
435         struct sctp_bind_addr *bp;
436         struct sctp_sockaddr_entry *laddr;
437         struct dst_entry *dst = NULL;
438         union sctp_addr *daddr = &t->ipaddr;
439         union sctp_addr dst_saddr;
440 
441         memset(fl4, 0x0, sizeof(struct flowi4));
442         fl4->daddr  = daddr->v4.sin_addr.s_addr;
443         fl4->fl4_dport = daddr->v4.sin_port;
444         fl4->flowi4_proto = IPPROTO_SCTP;
445         if (asoc) {
446                 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
447                 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
448                 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
449         }
450         if (saddr) {
451                 fl4->saddr = saddr->v4.sin_addr.s_addr;
452                 fl4->fl4_sport = saddr->v4.sin_port;
453         }
454 
455         pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
456                  &fl4->saddr);
457 
458         rt = ip_route_output_key(sock_net(sk), fl4);
459         if (!IS_ERR(rt))
460                 dst = &rt->dst;
461 
462         /* If there is no association or if a source address is passed, no
463          * more validation is required.
464          */
465         if (!asoc || saddr)
466                 goto out;
467 
468         bp = &asoc->base.bind_addr;
469 
470         if (dst) {
471                 /* Walk through the bind address list and look for a bind
472                  * address that matches the source address of the returned dst.
473                  */
474                 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
475                 rcu_read_lock();
476                 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
477                         if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
478                             (laddr->state != SCTP_ADDR_SRC &&
479                             !asoc->src_out_of_asoc_ok))
480                                 continue;
481                         if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
482                                 goto out_unlock;
483                 }
484                 rcu_read_unlock();
485 
486                 /* None of the bound addresses match the source address of the
487                  * dst. So release it.
488                  */
489                 dst_release(dst);
490                 dst = NULL;
491         }
492 
493         /* Walk through the bind address list and try to get a dst that
494          * matches a bind address as the source address.
495          */
496         rcu_read_lock();
497         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
498                 struct net_device *odev;
499 
500                 if (!laddr->valid)
501                         continue;
502                 if (laddr->state != SCTP_ADDR_SRC ||
503                     AF_INET != laddr->a.sa.sa_family)
504                         continue;
505 
506                 fl4->fl4_sport = laddr->a.v4.sin_port;
507                 flowi4_update_output(fl4,
508                                      asoc->base.sk->sk_bound_dev_if,
509                                      RT_CONN_FLAGS(asoc->base.sk),
510                                      daddr->v4.sin_addr.s_addr,
511                                      laddr->a.v4.sin_addr.s_addr);
512 
513                 rt = ip_route_output_key(sock_net(sk), fl4);
514                 if (IS_ERR(rt))
515                         continue;
516 
517                 if (!dst)
518                         dst = &rt->dst;
519 
520                 /* Ensure the src address belongs to the output
521                  * interface.
522                  */
523                 odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr,
524                                      false);
525                 if (!odev || odev->ifindex != fl4->flowi4_oif) {
526                         if (&rt->dst != dst)
527                                 dst_release(&rt->dst);
528                         continue;
529                 }
530 
531                 if (dst != &rt->dst)
532                         dst_release(dst);
533                 dst = &rt->dst;
534                 break;
535         }
536 
537 out_unlock:
538         rcu_read_unlock();
539 out:
540         t->dst = dst;
541         if (dst)
542                 pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
543                          &fl4->daddr, &fl4->saddr);
544         else
545                 pr_debug("no route\n");
546 }
547 
548 /* For v4, the source address is cached in the route entry(dst). So no need
549  * to cache it separately and hence this is an empty routine.
550  */
551 static void sctp_v4_get_saddr(struct sctp_sock *sk,
552                               struct sctp_transport *t,
553                               struct flowi *fl)
554 {
555         union sctp_addr *saddr = &t->saddr;
556         struct rtable *rt = (struct rtable *)t->dst;
557 
558         if (rt) {
559                 saddr->v4.sin_family = AF_INET;
560                 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
561         }
562 }
563 
564 /* What interface did this skb arrive on? */
565 static int sctp_v4_skb_iif(const struct sk_buff *skb)
566 {
567         return inet_iif(skb);
568 }
569 
570 /* Was this packet marked by Explicit Congestion Notification? */
571 static int sctp_v4_is_ce(const struct sk_buff *skb)
572 {
573         return INET_ECN_is_ce(ip_hdr(skb)->tos);
574 }
575 
576 /* Create and initialize a new sk for the socket returned by accept(). */
577 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
578                                              struct sctp_association *asoc,
579                                              bool kern)
580 {
581         struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
582                         sk->sk_prot, kern);
583         struct inet_sock *newinet;
584 
585         if (!newsk)
586                 goto out;
587 
588         sock_init_data(NULL, newsk);
589 
590         sctp_copy_sock(newsk, sk, asoc);
591         sock_reset_flag(newsk, SOCK_ZAPPED);
592 
593         newinet = inet_sk(newsk);
594 
595         newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
596 
597         sk_refcnt_debug_inc(newsk);
598 
599         if (newsk->sk_prot->init(newsk)) {
600                 sk_common_release(newsk);
601                 newsk = NULL;
602         }
603 
604 out:
605         return newsk;
606 }
607 
608 static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
609 {
610         /* No address mapping for V4 sockets */
611         return sizeof(struct sockaddr_in);
612 }
613 
614 /* Dump the v4 addr to the seq file. */
615 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
616 {
617         seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
618 }
619 
620 static void sctp_v4_ecn_capable(struct sock *sk)
621 {
622         INET_ECN_xmit(sk);
623 }
624 
625 static void sctp_addr_wq_timeout_handler(unsigned long arg)
626 {
627         struct net *net = (struct net *)arg;
628         struct sctp_sockaddr_entry *addrw, *temp;
629         struct sctp_sock *sp;
630 
631         spin_lock_bh(&net->sctp.addr_wq_lock);
632 
633         list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
634                 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
635                          "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
636                          addrw->state, addrw);
637 
638 #if IS_ENABLED(CONFIG_IPV6)
639                 /* Now we send an ASCONF for each association */
640                 /* Note. we currently don't handle link local IPv6 addressees */
641                 if (addrw->a.sa.sa_family == AF_INET6) {
642                         struct in6_addr *in6;
643 
644                         if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
645                             IPV6_ADDR_LINKLOCAL)
646                                 goto free_next;
647 
648                         in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
649                         if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
650                             addrw->state == SCTP_ADDR_NEW) {
651                                 unsigned long timeo_val;
652 
653                                 pr_debug("%s: this is on DAD, trying %d sec "
654                                          "later\n", __func__,
655                                          SCTP_ADDRESS_TICK_DELAY);
656 
657                                 timeo_val = jiffies;
658                                 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
659                                 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
660                                 break;
661                         }
662                 }
663 #endif
664                 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
665                         struct sock *sk;
666 
667                         sk = sctp_opt2sk(sp);
668                         /* ignore bound-specific endpoints */
669                         if (!sctp_is_ep_boundall(sk))
670                                 continue;
671                         bh_lock_sock(sk);
672                         if (sctp_asconf_mgmt(sp, addrw) < 0)
673                                 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
674                         bh_unlock_sock(sk);
675                 }
676 #if IS_ENABLED(CONFIG_IPV6)
677 free_next:
678 #endif
679                 list_del(&addrw->list);
680                 kfree(addrw);
681         }
682         spin_unlock_bh(&net->sctp.addr_wq_lock);
683 }
684 
685 static void sctp_free_addr_wq(struct net *net)
686 {
687         struct sctp_sockaddr_entry *addrw;
688         struct sctp_sockaddr_entry *temp;
689 
690         spin_lock_bh(&net->sctp.addr_wq_lock);
691         del_timer(&net->sctp.addr_wq_timer);
692         list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
693                 list_del(&addrw->list);
694                 kfree(addrw);
695         }
696         spin_unlock_bh(&net->sctp.addr_wq_lock);
697 }
698 
699 /* lookup the entry for the same address in the addr_waitq
700  * sctp_addr_wq MUST be locked
701  */
702 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
703                                         struct sctp_sockaddr_entry *addr)
704 {
705         struct sctp_sockaddr_entry *addrw;
706 
707         list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
708                 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
709                         continue;
710                 if (addrw->a.sa.sa_family == AF_INET) {
711                         if (addrw->a.v4.sin_addr.s_addr ==
712                             addr->a.v4.sin_addr.s_addr)
713                                 return addrw;
714                 } else if (addrw->a.sa.sa_family == AF_INET6) {
715                         if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
716                             &addr->a.v6.sin6_addr))
717                                 return addrw;
718                 }
719         }
720         return NULL;
721 }
722 
723 void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
724 {
725         struct sctp_sockaddr_entry *addrw;
726         unsigned long timeo_val;
727 
728         /* first, we check if an opposite message already exist in the queue.
729          * If we found such message, it is removed.
730          * This operation is a bit stupid, but the DHCP client attaches the
731          * new address after a couple of addition and deletion of that address
732          */
733 
734         spin_lock_bh(&net->sctp.addr_wq_lock);
735         /* Offsets existing events in addr_wq */
736         addrw = sctp_addr_wq_lookup(net, addr);
737         if (addrw) {
738                 if (addrw->state != cmd) {
739                         pr_debug("%s: offsets existing entry for %d, addr:%pISc "
740                                  "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
741                                  &net->sctp.addr_waitq);
742 
743                         list_del(&addrw->list);
744                         kfree(addrw);
745                 }
746                 spin_unlock_bh(&net->sctp.addr_wq_lock);
747                 return;
748         }
749 
750         /* OK, we have to add the new address to the wait queue */
751         addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
752         if (addrw == NULL) {
753                 spin_unlock_bh(&net->sctp.addr_wq_lock);
754                 return;
755         }
756         addrw->state = cmd;
757         list_add_tail(&addrw->list, &net->sctp.addr_waitq);
758 
759         pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
760                  __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
761 
762         if (!timer_pending(&net->sctp.addr_wq_timer)) {
763                 timeo_val = jiffies;
764                 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
765                 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
766         }
767         spin_unlock_bh(&net->sctp.addr_wq_lock);
768 }
769 
770 /* Event handler for inet address addition/deletion events.
771  * The sctp_local_addr_list needs to be protocted by a spin lock since
772  * multiple notifiers (say IPv4 and IPv6) may be running at the same
773  * time and thus corrupt the list.
774  * The reader side is protected with RCU.
775  */
776 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
777                                void *ptr)
778 {
779         struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
780         struct sctp_sockaddr_entry *addr = NULL;
781         struct sctp_sockaddr_entry *temp;
782         struct net *net = dev_net(ifa->ifa_dev->dev);
783         int found = 0;
784 
785         switch (ev) {
786         case NETDEV_UP:
787                 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
788                 if (addr) {
789                         addr->a.v4.sin_family = AF_INET;
790                         addr->a.v4.sin_port = 0;
791                         addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
792                         addr->valid = 1;
793                         spin_lock_bh(&net->sctp.local_addr_lock);
794                         list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
795                         sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
796                         spin_unlock_bh(&net->sctp.local_addr_lock);
797                 }
798                 break;
799         case NETDEV_DOWN:
800                 spin_lock_bh(&net->sctp.local_addr_lock);
801                 list_for_each_entry_safe(addr, temp,
802                                         &net->sctp.local_addr_list, list) {
803                         if (addr->a.sa.sa_family == AF_INET &&
804                                         addr->a.v4.sin_addr.s_addr ==
805                                         ifa->ifa_local) {
806                                 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
807                                 found = 1;
808                                 addr->valid = 0;
809                                 list_del_rcu(&addr->list);
810                                 break;
811                         }
812                 }
813                 spin_unlock_bh(&net->sctp.local_addr_lock);
814                 if (found)
815                         kfree_rcu(addr, rcu);
816                 break;
817         }
818 
819         return NOTIFY_DONE;
820 }
821 
822 /*
823  * Initialize the control inode/socket with a control endpoint data
824  * structure.  This endpoint is reserved exclusively for the OOTB processing.
825  */
826 static int sctp_ctl_sock_init(struct net *net)
827 {
828         int err;
829         sa_family_t family = PF_INET;
830 
831         if (sctp_get_pf_specific(PF_INET6))
832                 family = PF_INET6;
833 
834         err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
835                                    SOCK_SEQPACKET, IPPROTO_SCTP, net);
836 
837         /* If IPv6 socket could not be created, try the IPv4 socket */
838         if (err < 0 && family == PF_INET6)
839                 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
840                                            SOCK_SEQPACKET, IPPROTO_SCTP,
841                                            net);
842 
843         if (err < 0) {
844                 pr_err("Failed to create the SCTP control socket\n");
845                 return err;
846         }
847         return 0;
848 }
849 
850 /* Register address family specific functions. */
851 int sctp_register_af(struct sctp_af *af)
852 {
853         switch (af->sa_family) {
854         case AF_INET:
855                 if (sctp_af_v4_specific)
856                         return 0;
857                 sctp_af_v4_specific = af;
858                 break;
859         case AF_INET6:
860                 if (sctp_af_v6_specific)
861                         return 0;
862                 sctp_af_v6_specific = af;
863                 break;
864         default:
865                 return 0;
866         }
867 
868         INIT_LIST_HEAD(&af->list);
869         list_add_tail(&af->list, &sctp_address_families);
870         return 1;
871 }
872 
873 /* Get the table of functions for manipulating a particular address
874  * family.
875  */
876 struct sctp_af *sctp_get_af_specific(sa_family_t family)
877 {
878         switch (family) {
879         case AF_INET:
880                 return sctp_af_v4_specific;
881         case AF_INET6:
882                 return sctp_af_v6_specific;
883         default:
884                 return NULL;
885         }
886 }
887 
888 /* Common code to initialize a AF_INET msg_name. */
889 static void sctp_inet_msgname(char *msgname, int *addr_len)
890 {
891         struct sockaddr_in *sin;
892 
893         sin = (struct sockaddr_in *)msgname;
894         *addr_len = sizeof(struct sockaddr_in);
895         sin->sin_family = AF_INET;
896         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
897 }
898 
899 /* Copy the primary address of the peer primary address as the msg_name. */
900 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
901                                     int *addr_len)
902 {
903         struct sockaddr_in *sin, *sinfrom;
904 
905         if (msgname) {
906                 struct sctp_association *asoc;
907 
908                 asoc = event->asoc;
909                 sctp_inet_msgname(msgname, addr_len);
910                 sin = (struct sockaddr_in *)msgname;
911                 sinfrom = &asoc->peer.primary_addr.v4;
912                 sin->sin_port = htons(asoc->peer.port);
913                 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
914         }
915 }
916 
917 /* Initialize and copy out a msgname from an inbound skb. */
918 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
919 {
920         if (msgname) {
921                 struct sctphdr *sh = sctp_hdr(skb);
922                 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
923 
924                 sctp_inet_msgname(msgname, len);
925                 sin->sin_port = sh->source;
926                 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
927         }
928 }
929 
930 /* Do we support this AF? */
931 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
932 {
933         /* PF_INET only supports AF_INET addresses. */
934         return AF_INET == family;
935 }
936 
937 /* Address matching with wildcards allowed. */
938 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
939                               const union sctp_addr *addr2,
940                               struct sctp_sock *opt)
941 {
942         /* PF_INET only supports AF_INET addresses. */
943         if (addr1->sa.sa_family != addr2->sa.sa_family)
944                 return 0;
945         if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
946             htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
947                 return 1;
948         if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
949                 return 1;
950 
951         return 0;
952 }
953 
954 /* Verify that provided sockaddr looks bindable.  Common verification has
955  * already been taken care of.
956  */
957 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
958 {
959         return sctp_v4_available(addr, opt);
960 }
961 
962 /* Verify that sockaddr looks sendable.  Common verification has already
963  * been taken care of.
964  */
965 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
966 {
967         return 1;
968 }
969 
970 /* Fill in Supported Address Type information for INIT and INIT-ACK
971  * chunks.  Returns number of addresses supported.
972  */
973 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
974                                      __be16 *types)
975 {
976         types[0] = SCTP_PARAM_IPV4_ADDRESS;
977         return 1;
978 }
979 
980 /* Wrapper routine that calls the ip transmit routine. */
981 static inline int sctp_v4_xmit(struct sk_buff *skb,
982                                struct sctp_transport *transport)
983 {
984         struct inet_sock *inet = inet_sk(skb->sk);
985 
986         pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
987                  skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr);
988 
989         inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
990                          IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
991 
992         SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
993 
994         return ip_queue_xmit(&inet->sk, skb, &transport->fl);
995 }
996 
997 static struct sctp_af sctp_af_inet;
998 
999 static struct sctp_pf sctp_pf_inet = {
1000         .event_msgname = sctp_inet_event_msgname,
1001         .skb_msgname   = sctp_inet_skb_msgname,
1002         .af_supported  = sctp_inet_af_supported,
1003         .cmp_addr      = sctp_inet_cmp_addr,
1004         .bind_verify   = sctp_inet_bind_verify,
1005         .send_verify   = sctp_inet_send_verify,
1006         .supported_addrs = sctp_inet_supported_addrs,
1007         .create_accept_sk = sctp_v4_create_accept_sk,
1008         .addr_to_user  = sctp_v4_addr_to_user,
1009         .to_sk_saddr   = sctp_v4_to_sk_saddr,
1010         .to_sk_daddr   = sctp_v4_to_sk_daddr,
1011         .af            = &sctp_af_inet
1012 };
1013 
1014 /* Notifier for inetaddr addition/deletion events.  */
1015 static struct notifier_block sctp_inetaddr_notifier = {
1016         .notifier_call = sctp_inetaddr_event,
1017 };
1018 
1019 /* Socket operations.  */
1020 static const struct proto_ops inet_seqpacket_ops = {
1021         .family            = PF_INET,
1022         .owner             = THIS_MODULE,
1023         .release           = inet_release,      /* Needs to be wrapped... */
1024         .bind              = inet_bind,
1025         .connect           = inet_dgram_connect,
1026         .socketpair        = sock_no_socketpair,
1027         .accept            = inet_accept,
1028         .getname           = inet_getname,      /* Semantics are different.  */
1029         .poll              = sctp_poll,
1030         .ioctl             = inet_ioctl,
1031         .listen            = sctp_inet_listen,
1032         .shutdown          = inet_shutdown,     /* Looks harmless.  */
1033         .setsockopt        = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1034         .getsockopt        = sock_common_getsockopt,
1035         .sendmsg           = inet_sendmsg,
1036         .recvmsg           = inet_recvmsg,
1037         .mmap              = sock_no_mmap,
1038         .sendpage          = sock_no_sendpage,
1039 #ifdef CONFIG_COMPAT
1040         .compat_setsockopt = compat_sock_common_setsockopt,
1041         .compat_getsockopt = compat_sock_common_getsockopt,
1042 #endif
1043 };
1044 
1045 /* Registration with AF_INET family.  */
1046 static struct inet_protosw sctp_seqpacket_protosw = {
1047         .type       = SOCK_SEQPACKET,
1048         .protocol   = IPPROTO_SCTP,
1049         .prot       = &sctp_prot,
1050         .ops        = &inet_seqpacket_ops,
1051         .flags      = SCTP_PROTOSW_FLAG
1052 };
1053 static struct inet_protosw sctp_stream_protosw = {
1054         .type       = SOCK_STREAM,
1055         .protocol   = IPPROTO_SCTP,
1056         .prot       = &sctp_prot,
1057         .ops        = &inet_seqpacket_ops,
1058         .flags      = SCTP_PROTOSW_FLAG
1059 };
1060 
1061 /* Register with IP layer.  */
1062 static const struct net_protocol sctp_protocol = {
1063         .handler     = sctp_rcv,
1064         .err_handler = sctp_v4_err,
1065         .no_policy   = 1,
1066         .netns_ok    = 1,
1067         .icmp_strict_tag_validation = 1,
1068 };
1069 
1070 /* IPv4 address related functions.  */
1071 static struct sctp_af sctp_af_inet = {
1072         .sa_family         = AF_INET,
1073         .sctp_xmit         = sctp_v4_xmit,
1074         .setsockopt        = ip_setsockopt,
1075         .getsockopt        = ip_getsockopt,
1076         .get_dst           = sctp_v4_get_dst,
1077         .get_saddr         = sctp_v4_get_saddr,
1078         .copy_addrlist     = sctp_v4_copy_addrlist,
1079         .from_skb          = sctp_v4_from_skb,
1080         .from_sk           = sctp_v4_from_sk,
1081         .from_addr_param   = sctp_v4_from_addr_param,
1082         .to_addr_param     = sctp_v4_to_addr_param,
1083         .cmp_addr          = sctp_v4_cmp_addr,
1084         .addr_valid        = sctp_v4_addr_valid,
1085         .inaddr_any        = sctp_v4_inaddr_any,
1086         .is_any            = sctp_v4_is_any,
1087         .available         = sctp_v4_available,
1088         .scope             = sctp_v4_scope,
1089         .skb_iif           = sctp_v4_skb_iif,
1090         .is_ce             = sctp_v4_is_ce,
1091         .seq_dump_addr     = sctp_v4_seq_dump_addr,
1092         .ecn_capable       = sctp_v4_ecn_capable,
1093         .net_header_len    = sizeof(struct iphdr),
1094         .sockaddr_len      = sizeof(struct sockaddr_in),
1095 #ifdef CONFIG_COMPAT
1096         .compat_setsockopt = compat_ip_setsockopt,
1097         .compat_getsockopt = compat_ip_getsockopt,
1098 #endif
1099 };
1100 
1101 struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
1102 {
1103         switch (family) {
1104         case PF_INET:
1105                 return sctp_pf_inet_specific;
1106         case PF_INET6:
1107                 return sctp_pf_inet6_specific;
1108         default:
1109                 return NULL;
1110         }
1111 }
1112 
1113 /* Register the PF specific function table.  */
1114 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1115 {
1116         switch (family) {
1117         case PF_INET:
1118                 if (sctp_pf_inet_specific)
1119                         return 0;
1120                 sctp_pf_inet_specific = pf;
1121                 break;
1122         case PF_INET6:
1123                 if (sctp_pf_inet6_specific)
1124                         return 0;
1125                 sctp_pf_inet6_specific = pf;
1126                 break;
1127         default:
1128                 return 0;
1129         }
1130         return 1;
1131 }
1132 
1133 static inline int init_sctp_mibs(struct net *net)
1134 {
1135         net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib);
1136         if (!net->sctp.sctp_statistics)
1137                 return -ENOMEM;
1138         return 0;
1139 }
1140 
1141 static inline void cleanup_sctp_mibs(struct net *net)
1142 {
1143         free_percpu(net->sctp.sctp_statistics);
1144 }
1145 
1146 static void sctp_v4_pf_init(void)
1147 {
1148         /* Initialize the SCTP specific PF functions. */
1149         sctp_register_pf(&sctp_pf_inet, PF_INET);
1150         sctp_register_af(&sctp_af_inet);
1151 }
1152 
1153 static void sctp_v4_pf_exit(void)
1154 {
1155         list_del(&sctp_af_inet.list);
1156 }
1157 
1158 static int sctp_v4_protosw_init(void)
1159 {
1160         int rc;
1161 
1162         rc = proto_register(&sctp_prot, 1);
1163         if (rc)
1164                 return rc;
1165 
1166         /* Register SCTP(UDP and TCP style) with socket layer.  */
1167         inet_register_protosw(&sctp_seqpacket_protosw);
1168         inet_register_protosw(&sctp_stream_protosw);
1169 
1170         return 0;
1171 }
1172 
1173 static void sctp_v4_protosw_exit(void)
1174 {
1175         inet_unregister_protosw(&sctp_stream_protosw);
1176         inet_unregister_protosw(&sctp_seqpacket_protosw);
1177         proto_unregister(&sctp_prot);
1178 }
1179 
1180 static int sctp_v4_add_protocol(void)
1181 {
1182         /* Register notifier for inet address additions/deletions. */
1183         register_inetaddr_notifier(&sctp_inetaddr_notifier);
1184 
1185         /* Register SCTP with inet layer.  */
1186         if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1187                 return -EAGAIN;
1188 
1189         return 0;
1190 }
1191 
1192 static void sctp_v4_del_protocol(void)
1193 {
1194         inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1195         unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1196 }
1197 
1198 static int __net_init sctp_defaults_init(struct net *net)
1199 {
1200         int status;
1201 
1202         /*
1203          * 14. Suggested SCTP Protocol Parameter Values
1204          */
1205         /* The following protocol parameters are RECOMMENDED:  */
1206         /* RTO.Initial              - 3  seconds */
1207         net->sctp.rto_initial                   = SCTP_RTO_INITIAL;
1208         /* RTO.Min                  - 1  second */
1209         net->sctp.rto_min                       = SCTP_RTO_MIN;
1210         /* RTO.Max                 -  60 seconds */
1211         net->sctp.rto_max                       = SCTP_RTO_MAX;
1212         /* RTO.Alpha                - 1/8 */
1213         net->sctp.rto_alpha                     = SCTP_RTO_ALPHA;
1214         /* RTO.Beta                 - 1/4 */
1215         net->sctp.rto_beta                      = SCTP_RTO_BETA;
1216 
1217         /* Valid.Cookie.Life        - 60  seconds */
1218         net->sctp.valid_cookie_life             = SCTP_DEFAULT_COOKIE_LIFE;
1219 
1220         /* Whether Cookie Preservative is enabled(1) or not(0) */
1221         net->sctp.cookie_preserve_enable        = 1;
1222 
1223         /* Default sctp sockets to use md5 as their hmac alg */
1224 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1225         net->sctp.sctp_hmac_alg                 = "md5";
1226 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1227         net->sctp.sctp_hmac_alg                 = "sha1";
1228 #else
1229         net->sctp.sctp_hmac_alg                 = NULL;
1230 #endif
1231 
1232         /* Max.Burst                - 4 */
1233         net->sctp.max_burst                     = SCTP_DEFAULT_MAX_BURST;
1234 
1235         /* Enable pf state by default */
1236         net->sctp.pf_enable = 1;
1237 
1238         /* Association.Max.Retrans  - 10 attempts
1239          * Path.Max.Retrans         - 5  attempts (per destination address)
1240          * Max.Init.Retransmits     - 8  attempts
1241          */
1242         net->sctp.max_retrans_association       = 10;
1243         net->sctp.max_retrans_path              = 5;
1244         net->sctp.max_retrans_init              = 8;
1245 
1246         /* Sendbuffer growth        - do per-socket accounting */
1247         net->sctp.sndbuf_policy                 = 0;
1248 
1249         /* Rcvbuffer growth         - do per-socket accounting */
1250         net->sctp.rcvbuf_policy                 = 0;
1251 
1252         /* HB.interval              - 30 seconds */
1253         net->sctp.hb_interval                   = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1254 
1255         /* delayed SACK timeout */
1256         net->sctp.sack_timeout                  = SCTP_DEFAULT_TIMEOUT_SACK;
1257 
1258         /* Disable ADDIP by default. */
1259         net->sctp.addip_enable = 0;
1260         net->sctp.addip_noauth = 0;
1261         net->sctp.default_auto_asconf = 0;
1262 
1263         /* Enable PR-SCTP by default. */
1264         net->sctp.prsctp_enable = 1;
1265 
1266         /* Disable RECONF by default. */
1267         net->sctp.reconf_enable = 0;
1268 
1269         /* Disable AUTH by default. */
1270         net->sctp.auth_enable = 0;
1271 
1272         /* Set SCOPE policy to enabled */
1273         net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1274 
1275         /* Set the default rwnd update threshold */
1276         net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1277 
1278         /* Initialize maximum autoclose timeout. */
1279         net->sctp.max_autoclose         = INT_MAX / HZ;
1280 
1281         status = sctp_sysctl_net_register(net);
1282         if (status)
1283                 goto err_sysctl_register;
1284 
1285         /* Allocate and initialise sctp mibs.  */
1286         status = init_sctp_mibs(net);
1287         if (status)
1288                 goto err_init_mibs;
1289 
1290         /* Initialize proc fs directory.  */
1291         status = sctp_proc_init(net);
1292         if (status)
1293                 goto err_init_proc;
1294 
1295         sctp_dbg_objcnt_init(net);
1296 
1297         /* Initialize the local address list. */
1298         INIT_LIST_HEAD(&net->sctp.local_addr_list);
1299         spin_lock_init(&net->sctp.local_addr_lock);
1300         sctp_get_local_addr_list(net);
1301 
1302         /* Initialize the address event list */
1303         INIT_LIST_HEAD(&net->sctp.addr_waitq);
1304         INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1305         spin_lock_init(&net->sctp.addr_wq_lock);
1306         net->sctp.addr_wq_timer.expires = 0;
1307         setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler,
1308                     (unsigned long)net);
1309 
1310         return 0;
1311 
1312 err_init_proc:
1313         cleanup_sctp_mibs(net);
1314 err_init_mibs:
1315         sctp_sysctl_net_unregister(net);
1316 err_sysctl_register:
1317         return status;
1318 }
1319 
1320 static void __net_exit sctp_defaults_exit(struct net *net)
1321 {
1322         /* Free the local address list */
1323         sctp_free_addr_wq(net);
1324         sctp_free_local_addr_list(net);
1325 
1326         sctp_dbg_objcnt_exit(net);
1327 
1328         sctp_proc_exit(net);
1329         cleanup_sctp_mibs(net);
1330         sctp_sysctl_net_unregister(net);
1331 }
1332 
1333 static struct pernet_operations sctp_defaults_ops = {
1334         .init = sctp_defaults_init,
1335         .exit = sctp_defaults_exit,
1336 };
1337 
1338 static int __net_init sctp_ctrlsock_init(struct net *net)
1339 {
1340         int status;
1341 
1342         /* Initialize the control inode/socket for handling OOTB packets.  */
1343         status = sctp_ctl_sock_init(net);
1344         if (status)
1345                 pr_err("Failed to initialize the SCTP control sock\n");
1346 
1347         return status;
1348 }
1349 
1350 static void __net_init sctp_ctrlsock_exit(struct net *net)
1351 {
1352         /* Free the control endpoint.  */
1353         inet_ctl_sock_destroy(net->sctp.ctl_sock);
1354 }
1355 
1356 static struct pernet_operations sctp_ctrlsock_ops = {
1357         .init = sctp_ctrlsock_init,
1358         .exit = sctp_ctrlsock_exit,
1359 };
1360 
1361 /* Initialize the universe into something sensible.  */
1362 static __init int sctp_init(void)
1363 {
1364         int i;
1365         int status = -EINVAL;
1366         unsigned long goal;
1367         unsigned long limit;
1368         int max_share;
1369         int order;
1370         int num_entries;
1371         int max_entry_order;
1372 
1373         sock_skb_cb_check_size(sizeof(struct sctp_ulpevent));
1374 
1375         /* Allocate bind_bucket and chunk caches. */
1376         status = -ENOBUFS;
1377         sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1378                                                sizeof(struct sctp_bind_bucket),
1379                                                0, SLAB_HWCACHE_ALIGN,
1380                                                NULL);
1381         if (!sctp_bucket_cachep)
1382                 goto out;
1383 
1384         sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1385                                                sizeof(struct sctp_chunk),
1386                                                0, SLAB_HWCACHE_ALIGN,
1387                                                NULL);
1388         if (!sctp_chunk_cachep)
1389                 goto err_chunk_cachep;
1390 
1391         status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL);
1392         if (status)
1393                 goto err_percpu_counter_init;
1394 
1395         /* Implementation specific variables. */
1396 
1397         /* Initialize default stream count setup information. */
1398         sctp_max_instreams              = SCTP_DEFAULT_INSTREAMS;
1399         sctp_max_outstreams             = SCTP_DEFAULT_OUTSTREAMS;
1400 
1401         /* Initialize handle used for association ids. */
1402         idr_init(&sctp_assocs_id);
1403 
1404         limit = nr_free_buffer_pages() / 8;
1405         limit = max(limit, 128UL);
1406         sysctl_sctp_mem[0] = limit / 4 * 3;
1407         sysctl_sctp_mem[1] = limit;
1408         sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1409 
1410         /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1411         limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1412         max_share = min(4UL*1024*1024, limit);
1413 
1414         sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1415         sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1416         sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1417 
1418         sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1419         sysctl_sctp_wmem[1] = 16*1024;
1420         sysctl_sctp_wmem[2] = max(64*1024, max_share);
1421 
1422         /* Size and allocate the association hash table.
1423          * The methodology is similar to that of the tcp hash tables.
1424          * Though not identical.  Start by getting a goal size
1425          */
1426         if (totalram_pages >= (128 * 1024))
1427                 goal = totalram_pages >> (22 - PAGE_SHIFT);
1428         else
1429                 goal = totalram_pages >> (24 - PAGE_SHIFT);
1430 
1431         /* Then compute the page order for said goal */
1432         order = get_order(goal);
1433 
1434         /* Now compute the required page order for the maximum sized table we
1435          * want to create
1436          */
1437         max_entry_order = get_order(MAX_SCTP_PORT_HASH_ENTRIES *
1438                                     sizeof(struct sctp_bind_hashbucket));
1439 
1440         /* Limit the page order by that maximum hash table size */
1441         order = min(order, max_entry_order);
1442 
1443         /* Allocate and initialize the endpoint hash table.  */
1444         sctp_ep_hashsize = 64;
1445         sctp_ep_hashtable =
1446                 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1447         if (!sctp_ep_hashtable) {
1448                 pr_err("Failed endpoint_hash alloc\n");
1449                 status = -ENOMEM;
1450                 goto err_ehash_alloc;
1451         }
1452         for (i = 0; i < sctp_ep_hashsize; i++) {
1453                 rwlock_init(&sctp_ep_hashtable[i].lock);
1454                 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1455         }
1456 
1457         /* Allocate and initialize the SCTP port hash table.
1458          * Note that order is initalized to start at the max sized
1459          * table we want to support.  If we can't get that many pages
1460          * reduce the order and try again
1461          */
1462         do {
1463                 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1464                         __get_free_pages(GFP_KERNEL | __GFP_NOWARN, order);
1465         } while (!sctp_port_hashtable && --order > 0);
1466 
1467         if (!sctp_port_hashtable) {
1468                 pr_err("Failed bind hash alloc\n");
1469                 status = -ENOMEM;
1470                 goto err_bhash_alloc;
1471         }
1472 
1473         /* Now compute the number of entries that will fit in the
1474          * port hash space we allocated
1475          */
1476         num_entries = (1UL << order) * PAGE_SIZE /
1477                       sizeof(struct sctp_bind_hashbucket);
1478 
1479         /* And finish by rounding it down to the nearest power of two
1480          * this wastes some memory of course, but its needed because
1481          * the hash function operates based on the assumption that
1482          * that the number of entries is a power of two
1483          */
1484         sctp_port_hashsize = rounddown_pow_of_two(num_entries);
1485 
1486         for (i = 0; i < sctp_port_hashsize; i++) {
1487                 spin_lock_init(&sctp_port_hashtable[i].lock);
1488                 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1489         }
1490 
1491         status = sctp_transport_hashtable_init();
1492         if (status)
1493                 goto err_thash_alloc;
1494 
1495         pr_info("Hash tables configured (bind %d/%d)\n", sctp_port_hashsize,
1496                 num_entries);
1497 
1498         sctp_sysctl_register();
1499 
1500         INIT_LIST_HEAD(&sctp_address_families);
1501         sctp_v4_pf_init();
1502         sctp_v6_pf_init();
1503 
1504         status = register_pernet_subsys(&sctp_defaults_ops);
1505         if (status)
1506                 goto err_register_defaults;
1507 
1508         status = sctp_v4_protosw_init();
1509         if (status)
1510                 goto err_protosw_init;
1511 
1512         status = sctp_v6_protosw_init();
1513         if (status)
1514                 goto err_v6_protosw_init;
1515 
1516         status = register_pernet_subsys(&sctp_ctrlsock_ops);
1517         if (status)
1518                 goto err_register_ctrlsock;
1519 
1520         status = sctp_v4_add_protocol();
1521         if (status)
1522                 goto err_add_protocol;
1523 
1524         /* Register SCTP with inet6 layer.  */
1525         status = sctp_v6_add_protocol();
1526         if (status)
1527                 goto err_v6_add_protocol;
1528 
1529         if (sctp_offload_init() < 0)
1530                 pr_crit("%s: Cannot add SCTP protocol offload\n", __func__);
1531 
1532 out:
1533         return status;
1534 err_v6_add_protocol:
1535         sctp_v4_del_protocol();
1536 err_add_protocol:
1537         unregister_pernet_subsys(&sctp_ctrlsock_ops);
1538 err_register_ctrlsock:
1539         sctp_v6_protosw_exit();
1540 err_v6_protosw_init:
1541         sctp_v4_protosw_exit();
1542 err_protosw_init:
1543         unregister_pernet_subsys(&sctp_defaults_ops);
1544 err_register_defaults:
1545         sctp_v4_pf_exit();
1546         sctp_v6_pf_exit();
1547         sctp_sysctl_unregister();
1548         free_pages((unsigned long)sctp_port_hashtable,
1549                    get_order(sctp_port_hashsize *
1550                              sizeof(struct sctp_bind_hashbucket)));
1551 err_bhash_alloc:
1552         sctp_transport_hashtable_destroy();
1553 err_thash_alloc:
1554         kfree(sctp_ep_hashtable);
1555 err_ehash_alloc:
1556         percpu_counter_destroy(&sctp_sockets_allocated);
1557 err_percpu_counter_init:
1558         kmem_cache_destroy(sctp_chunk_cachep);
1559 err_chunk_cachep:
1560         kmem_cache_destroy(sctp_bucket_cachep);
1561         goto out;
1562 }
1563 
1564 /* Exit handler for the SCTP protocol.  */
1565 static __exit void sctp_exit(void)
1566 {
1567         /* BUG.  This should probably do something useful like clean
1568          * up all the remaining associations and all that memory.
1569          */
1570 
1571         /* Unregister with inet6/inet layers. */
1572         sctp_v6_del_protocol();
1573         sctp_v4_del_protocol();
1574 
1575         unregister_pernet_subsys(&sctp_ctrlsock_ops);
1576 
1577         /* Free protosw registrations */
1578         sctp_v6_protosw_exit();
1579         sctp_v4_protosw_exit();
1580 
1581         unregister_pernet_subsys(&sctp_defaults_ops);
1582 
1583         /* Unregister with socket layer. */
1584         sctp_v6_pf_exit();
1585         sctp_v4_pf_exit();
1586 
1587         sctp_sysctl_unregister();
1588 
1589         free_pages((unsigned long)sctp_port_hashtable,
1590                    get_order(sctp_port_hashsize *
1591                              sizeof(struct sctp_bind_hashbucket)));
1592         kfree(sctp_ep_hashtable);
1593         sctp_transport_hashtable_destroy();
1594 
1595         percpu_counter_destroy(&sctp_sockets_allocated);
1596 
1597         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1598 
1599         kmem_cache_destroy(sctp_chunk_cachep);
1600         kmem_cache_destroy(sctp_bucket_cachep);
1601 }
1602 
1603 module_init(sctp_init);
1604 module_exit(sctp_exit);
1605 
1606 /*
1607  * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1608  */
1609 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1610 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1611 MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
1612 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1613 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1614 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1615 MODULE_LICENSE("GPL");
1616 

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