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