~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.1-rc5 ] ~ [ linux-5.0.7 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.34 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.111 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.168 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.178 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.138 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.65 ] ~ [ 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-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ 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/memblock.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 /* Private helper to extract ipv4 address and stash them in
 84  * the protocol structure.
 85  */
 86 static void sctp_v4_copy_addrlist(struct list_head *addrlist,
 87                                   struct net_device *dev)
 88 {
 89         struct in_device *in_dev;
 90         struct in_ifaddr *ifa;
 91         struct sctp_sockaddr_entry *addr;
 92 
 93         rcu_read_lock();
 94         if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
 95                 rcu_read_unlock();
 96                 return;
 97         }
 98 
 99         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
100                 /* Add the address to the local list.  */
101                 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
102                 if (addr) {
103                         addr->a.v4.sin_family = AF_INET;
104                         addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
105                         addr->valid = 1;
106                         INIT_LIST_HEAD(&addr->list);
107                         list_add_tail(&addr->list, addrlist);
108                 }
109         }
110 
111         rcu_read_unlock();
112 }
113 
114 /* Extract our IP addresses from the system and stash them in the
115  * protocol structure.
116  */
117 static void sctp_get_local_addr_list(struct net *net)
118 {
119         struct net_device *dev;
120         struct list_head *pos;
121         struct sctp_af *af;
122 
123         rcu_read_lock();
124         for_each_netdev_rcu(net, dev) {
125                 list_for_each(pos, &sctp_address_families) {
126                         af = list_entry(pos, struct sctp_af, list);
127                         af->copy_addrlist(&net->sctp.local_addr_list, dev);
128                 }
129         }
130         rcu_read_unlock();
131 }
132 
133 /* Free the existing local addresses.  */
134 static void sctp_free_local_addr_list(struct net *net)
135 {
136         struct sctp_sockaddr_entry *addr;
137         struct list_head *pos, *temp;
138 
139         list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
140                 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
141                 list_del(pos);
142                 kfree(addr);
143         }
144 }
145 
146 /* Copy the local addresses which are valid for 'scope' into 'bp'.  */
147 int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
148                               enum sctp_scope scope, gfp_t gfp, int copy_flags)
149 {
150         struct sctp_sockaddr_entry *addr;
151         union sctp_addr laddr;
152         int error = 0;
153 
154         rcu_read_lock();
155         list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
156                 if (!addr->valid)
157                         continue;
158                 if (!sctp_in_scope(net, &addr->a, scope))
159                         continue;
160 
161                 /* Now that the address is in scope, check to see if
162                  * the address type is really supported by the local
163                  * sock as well as the remote peer.
164                  */
165                 if (addr->a.sa.sa_family == AF_INET &&
166                     !(copy_flags & SCTP_ADDR4_PEERSUPP))
167                         continue;
168                 if (addr->a.sa.sa_family == AF_INET6 &&
169                     (!(copy_flags & SCTP_ADDR6_ALLOWED) ||
170                      !(copy_flags & SCTP_ADDR6_PEERSUPP)))
171                         continue;
172 
173                 laddr = addr->a;
174                 /* also works for setting ipv6 address port */
175                 laddr.v4.sin_port = htons(bp->port);
176                 if (sctp_bind_addr_state(bp, &laddr) != -1)
177                         continue;
178 
179                 error = sctp_add_bind_addr(bp, &addr->a, sizeof(addr->a),
180                                            SCTP_ADDR_SRC, GFP_ATOMIC);
181                 if (error)
182                         break;
183         }
184 
185         rcu_read_unlock();
186         return error;
187 }
188 
189 /* Copy over any ip options */
190 static void sctp_v4_copy_ip_options(struct sock *sk, struct sock *newsk)
191 {
192         struct inet_sock *newinet, *inet = inet_sk(sk);
193         struct ip_options_rcu *inet_opt, *newopt = NULL;
194 
195         newinet = inet_sk(newsk);
196 
197         rcu_read_lock();
198         inet_opt = rcu_dereference(inet->inet_opt);
199         if (inet_opt) {
200                 newopt = sock_kmalloc(newsk, sizeof(*inet_opt) +
201                                       inet_opt->opt.optlen, GFP_ATOMIC);
202                 if (newopt)
203                         memcpy(newopt, inet_opt, sizeof(*inet_opt) +
204                                inet_opt->opt.optlen);
205                 else
206                         pr_err("%s: Failed to copy ip options\n", __func__);
207         }
208         RCU_INIT_POINTER(newinet->inet_opt, newopt);
209         rcu_read_unlock();
210 }
211 
212 /* Account for the IP options */
213 static int sctp_v4_ip_options_len(struct sock *sk)
214 {
215         struct inet_sock *inet = inet_sk(sk);
216         struct ip_options_rcu *inet_opt;
217         int len = 0;
218 
219         rcu_read_lock();
220         inet_opt = rcu_dereference(inet->inet_opt);
221         if (inet_opt)
222                 len = inet_opt->opt.optlen;
223 
224         rcu_read_unlock();
225         return len;
226 }
227 
228 /* Initialize a sctp_addr from in incoming skb.  */
229 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
230                              int is_saddr)
231 {
232         /* Always called on head skb, so this is safe */
233         struct sctphdr *sh = sctp_hdr(skb);
234         struct sockaddr_in *sa = &addr->v4;
235 
236         addr->v4.sin_family = AF_INET;
237 
238         if (is_saddr) {
239                 sa->sin_port = sh->source;
240                 sa->sin_addr.s_addr = ip_hdr(skb)->saddr;
241         } else {
242                 sa->sin_port = sh->dest;
243                 sa->sin_addr.s_addr = ip_hdr(skb)->daddr;
244         }
245 }
246 
247 /* Initialize an sctp_addr from a socket. */
248 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
249 {
250         addr->v4.sin_family = AF_INET;
251         addr->v4.sin_port = 0;
252         addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
253 }
254 
255 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
256 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
257 {
258         inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
259 }
260 
261 /* Initialize sk->sk_daddr from sctp_addr. */
262 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
263 {
264         inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
265 }
266 
267 /* Initialize a sctp_addr from an address parameter. */
268 static void sctp_v4_from_addr_param(union sctp_addr *addr,
269                                     union sctp_addr_param *param,
270                                     __be16 port, int iif)
271 {
272         addr->v4.sin_family = AF_INET;
273         addr->v4.sin_port = port;
274         addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
275 }
276 
277 /* Initialize an address parameter from a sctp_addr and return the length
278  * of the address parameter.
279  */
280 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
281                                  union sctp_addr_param *param)
282 {
283         int length = sizeof(struct sctp_ipv4addr_param);
284 
285         param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
286         param->v4.param_hdr.length = htons(length);
287         param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
288 
289         return length;
290 }
291 
292 /* Initialize a sctp_addr from a dst_entry. */
293 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
294                               __be16 port)
295 {
296         saddr->v4.sin_family = AF_INET;
297         saddr->v4.sin_port = port;
298         saddr->v4.sin_addr.s_addr = fl4->saddr;
299 }
300 
301 /* Compare two addresses exactly. */
302 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
303                             const union sctp_addr *addr2)
304 {
305         if (addr1->sa.sa_family != addr2->sa.sa_family)
306                 return 0;
307         if (addr1->v4.sin_port != addr2->v4.sin_port)
308                 return 0;
309         if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
310                 return 0;
311 
312         return 1;
313 }
314 
315 /* Initialize addr struct to INADDR_ANY. */
316 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
317 {
318         addr->v4.sin_family = AF_INET;
319         addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
320         addr->v4.sin_port = port;
321 }
322 
323 /* Is this a wildcard address? */
324 static int sctp_v4_is_any(const union sctp_addr *addr)
325 {
326         return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
327 }
328 
329 /* This function checks if the address is a valid address to be used for
330  * SCTP binding.
331  *
332  * Output:
333  * Return 0 - If the address is a non-unicast or an illegal address.
334  * Return 1 - If the address is a unicast.
335  */
336 static int sctp_v4_addr_valid(union sctp_addr *addr,
337                               struct sctp_sock *sp,
338                               const struct sk_buff *skb)
339 {
340         /* IPv4 addresses not allowed */
341         if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
342                 return 0;
343 
344         /* Is this a non-unicast address or a unusable SCTP address? */
345         if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
346                 return 0;
347 
348         /* Is this a broadcast address? */
349         if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
350                 return 0;
351 
352         return 1;
353 }
354 
355 /* Should this be available for binding?   */
356 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
357 {
358         struct net *net = sock_net(&sp->inet.sk);
359         int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
360 
361 
362         if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
363            ret != RTN_LOCAL &&
364            !sp->inet.freebind &&
365            !net->ipv4.sysctl_ip_nonlocal_bind)
366                 return 0;
367 
368         if (ipv6_only_sock(sctp_opt2sk(sp)))
369                 return 0;
370 
371         return 1;
372 }
373 
374 /* Checking the loopback, private and other address scopes as defined in
375  * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
376  * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
377  *
378  * Level 0 - unusable SCTP addresses
379  * Level 1 - loopback address
380  * Level 2 - link-local addresses
381  * Level 3 - private addresses.
382  * Level 4 - global addresses
383  * For INIT and INIT-ACK address list, let L be the level of
384  * of requested destination address, sender and receiver
385  * SHOULD include all of its addresses with level greater
386  * than or equal to L.
387  *
388  * IPv4 scoping can be controlled through sysctl option
389  * net.sctp.addr_scope_policy
390  */
391 static enum sctp_scope sctp_v4_scope(union sctp_addr *addr)
392 {
393         enum sctp_scope retval;
394 
395         /* Check for unusable SCTP addresses. */
396         if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
397                 retval =  SCTP_SCOPE_UNUSABLE;
398         } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
399                 retval = SCTP_SCOPE_LOOPBACK;
400         } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
401                 retval = SCTP_SCOPE_LINK;
402         } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
403                    ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
404                    ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
405                 retval = SCTP_SCOPE_PRIVATE;
406         } else {
407                 retval = SCTP_SCOPE_GLOBAL;
408         }
409 
410         return retval;
411 }
412 
413 /* Returns a valid dst cache entry for the given source and destination ip
414  * addresses. If an association is passed, trys to get a dst entry with a
415  * source address that matches an address in the bind address list.
416  */
417 static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
418                                 struct flowi *fl, struct sock *sk)
419 {
420         struct sctp_association *asoc = t->asoc;
421         struct rtable *rt;
422         struct flowi4 *fl4 = &fl->u.ip4;
423         struct sctp_bind_addr *bp;
424         struct sctp_sockaddr_entry *laddr;
425         struct dst_entry *dst = NULL;
426         union sctp_addr *daddr = &t->ipaddr;
427         union sctp_addr dst_saddr;
428         __u8 tos = inet_sk(sk)->tos;
429 
430         if (t->dscp & SCTP_DSCP_SET_MASK)
431                 tos = t->dscp & SCTP_DSCP_VAL_MASK;
432         memset(fl4, 0x0, sizeof(struct flowi4));
433         fl4->daddr  = daddr->v4.sin_addr.s_addr;
434         fl4->fl4_dport = daddr->v4.sin_port;
435         fl4->flowi4_proto = IPPROTO_SCTP;
436         if (asoc) {
437                 fl4->flowi4_tos = RT_CONN_FLAGS_TOS(asoc->base.sk, tos);
438                 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
439                 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
440         }
441         if (saddr) {
442                 fl4->saddr = saddr->v4.sin_addr.s_addr;
443                 if (!fl4->fl4_sport)
444                         fl4->fl4_sport = saddr->v4.sin_port;
445         }
446 
447         pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
448                  &fl4->saddr);
449 
450         rt = ip_route_output_key(sock_net(sk), fl4);
451         if (!IS_ERR(rt))
452                 dst = &rt->dst;
453 
454         /* If there is no association or if a source address is passed, no
455          * more validation is required.
456          */
457         if (!asoc || saddr)
458                 goto out;
459 
460         bp = &asoc->base.bind_addr;
461 
462         if (dst) {
463                 /* Walk through the bind address list and look for a bind
464                  * address that matches the source address of the returned dst.
465                  */
466                 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
467                 rcu_read_lock();
468                 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
469                         if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
470                             (laddr->state != SCTP_ADDR_SRC &&
471                             !asoc->src_out_of_asoc_ok))
472                                 continue;
473                         if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
474                                 goto out_unlock;
475                 }
476                 rcu_read_unlock();
477 
478                 /* None of the bound addresses match the source address of the
479                  * dst. So release it.
480                  */
481                 dst_release(dst);
482                 dst = NULL;
483         }
484 
485         /* Walk through the bind address list and try to get a dst that
486          * matches a bind address as the source address.
487          */
488         rcu_read_lock();
489         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
490                 struct net_device *odev;
491 
492                 if (!laddr->valid)
493                         continue;
494                 if (laddr->state != SCTP_ADDR_SRC ||
495                     AF_INET != laddr->a.sa.sa_family)
496                         continue;
497 
498                 fl4->fl4_sport = laddr->a.v4.sin_port;
499                 flowi4_update_output(fl4,
500                                      asoc->base.sk->sk_bound_dev_if,
501                                      RT_CONN_FLAGS_TOS(asoc->base.sk, tos),
502                                      daddr->v4.sin_addr.s_addr,
503                                      laddr->a.v4.sin_addr.s_addr);
504 
505                 rt = ip_route_output_key(sock_net(sk), fl4);
506                 if (IS_ERR(rt))
507                         continue;
508 
509                 /* Ensure the src address belongs to the output
510                  * interface.
511                  */
512                 odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr,
513                                      false);
514                 if (!odev || odev->ifindex != fl4->flowi4_oif) {
515                         if (!dst)
516                                 dst = &rt->dst;
517                         else
518                                 dst_release(&rt->dst);
519                         continue;
520                 }
521 
522                 dst_release(dst);
523                 dst = &rt->dst;
524                 break;
525         }
526 
527 out_unlock:
528         rcu_read_unlock();
529 out:
530         t->dst = dst;
531         if (dst)
532                 pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
533                          &fl4->daddr, &fl4->saddr);
534         else
535                 pr_debug("no route\n");
536 }
537 
538 /* For v4, the source address is cached in the route entry(dst). So no need
539  * to cache it separately and hence this is an empty routine.
540  */
541 static void sctp_v4_get_saddr(struct sctp_sock *sk,
542                               struct sctp_transport *t,
543                               struct flowi *fl)
544 {
545         union sctp_addr *saddr = &t->saddr;
546         struct rtable *rt = (struct rtable *)t->dst;
547 
548         if (rt) {
549                 saddr->v4.sin_family = AF_INET;
550                 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
551         }
552 }
553 
554 /* What interface did this skb arrive on? */
555 static int sctp_v4_skb_iif(const struct sk_buff *skb)
556 {
557         return inet_iif(skb);
558 }
559 
560 /* Was this packet marked by Explicit Congestion Notification? */
561 static int sctp_v4_is_ce(const struct sk_buff *skb)
562 {
563         return INET_ECN_is_ce(ip_hdr(skb)->tos);
564 }
565 
566 /* Create and initialize a new sk for the socket returned by accept(). */
567 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
568                                              struct sctp_association *asoc,
569                                              bool kern)
570 {
571         struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
572                         sk->sk_prot, kern);
573         struct inet_sock *newinet;
574 
575         if (!newsk)
576                 goto out;
577 
578         sock_init_data(NULL, newsk);
579 
580         sctp_copy_sock(newsk, sk, asoc);
581         sock_reset_flag(newsk, SOCK_ZAPPED);
582 
583         sctp_v4_copy_ip_options(sk, newsk);
584 
585         newinet = inet_sk(newsk);
586 
587         newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
588 
589         sk_refcnt_debug_inc(newsk);
590 
591         if (newsk->sk_prot->init(newsk)) {
592                 sk_common_release(newsk);
593                 newsk = NULL;
594         }
595 
596 out:
597         return newsk;
598 }
599 
600 static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
601 {
602         /* No address mapping for V4 sockets */
603         memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
604         return sizeof(struct sockaddr_in);
605 }
606 
607 /* Dump the v4 addr to the seq file. */
608 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
609 {
610         seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
611 }
612 
613 static void sctp_v4_ecn_capable(struct sock *sk)
614 {
615         INET_ECN_xmit(sk);
616 }
617 
618 static void sctp_addr_wq_timeout_handler(struct timer_list *t)
619 {
620         struct net *net = from_timer(net, t, sctp.addr_wq_timer);
621         struct sctp_sockaddr_entry *addrw, *temp;
622         struct sctp_sock *sp;
623 
624         spin_lock_bh(&net->sctp.addr_wq_lock);
625 
626         list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
627                 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
628                          "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
629                          addrw->state, addrw);
630 
631 #if IS_ENABLED(CONFIG_IPV6)
632                 /* Now we send an ASCONF for each association */
633                 /* Note. we currently don't handle link local IPv6 addressees */
634                 if (addrw->a.sa.sa_family == AF_INET6) {
635                         struct in6_addr *in6;
636 
637                         if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
638                             IPV6_ADDR_LINKLOCAL)
639                                 goto free_next;
640 
641                         in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
642                         if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
643                             addrw->state == SCTP_ADDR_NEW) {
644                                 unsigned long timeo_val;
645 
646                                 pr_debug("%s: this is on DAD, trying %d sec "
647                                          "later\n", __func__,
648                                          SCTP_ADDRESS_TICK_DELAY);
649 
650                                 timeo_val = jiffies;
651                                 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
652                                 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
653                                 break;
654                         }
655                 }
656 #endif
657                 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
658                         struct sock *sk;
659 
660                         sk = sctp_opt2sk(sp);
661                         /* ignore bound-specific endpoints */
662                         if (!sctp_is_ep_boundall(sk))
663                                 continue;
664                         bh_lock_sock(sk);
665                         if (sctp_asconf_mgmt(sp, addrw) < 0)
666                                 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
667                         bh_unlock_sock(sk);
668                 }
669 #if IS_ENABLED(CONFIG_IPV6)
670 free_next:
671 #endif
672                 list_del(&addrw->list);
673                 kfree(addrw);
674         }
675         spin_unlock_bh(&net->sctp.addr_wq_lock);
676 }
677 
678 static void sctp_free_addr_wq(struct net *net)
679 {
680         struct sctp_sockaddr_entry *addrw;
681         struct sctp_sockaddr_entry *temp;
682 
683         spin_lock_bh(&net->sctp.addr_wq_lock);
684         del_timer(&net->sctp.addr_wq_timer);
685         list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
686                 list_del(&addrw->list);
687                 kfree(addrw);
688         }
689         spin_unlock_bh(&net->sctp.addr_wq_lock);
690 }
691 
692 /* lookup the entry for the same address in the addr_waitq
693  * sctp_addr_wq MUST be locked
694  */
695 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
696                                         struct sctp_sockaddr_entry *addr)
697 {
698         struct sctp_sockaddr_entry *addrw;
699 
700         list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
701                 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
702                         continue;
703                 if (addrw->a.sa.sa_family == AF_INET) {
704                         if (addrw->a.v4.sin_addr.s_addr ==
705                             addr->a.v4.sin_addr.s_addr)
706                                 return addrw;
707                 } else if (addrw->a.sa.sa_family == AF_INET6) {
708                         if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
709                             &addr->a.v6.sin6_addr))
710                                 return addrw;
711                 }
712         }
713         return NULL;
714 }
715 
716 void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
717 {
718         struct sctp_sockaddr_entry *addrw;
719         unsigned long timeo_val;
720 
721         /* first, we check if an opposite message already exist in the queue.
722          * If we found such message, it is removed.
723          * This operation is a bit stupid, but the DHCP client attaches the
724          * new address after a couple of addition and deletion of that address
725          */
726 
727         spin_lock_bh(&net->sctp.addr_wq_lock);
728         /* Offsets existing events in addr_wq */
729         addrw = sctp_addr_wq_lookup(net, addr);
730         if (addrw) {
731                 if (addrw->state != cmd) {
732                         pr_debug("%s: offsets existing entry for %d, addr:%pISc "
733                                  "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
734                                  &net->sctp.addr_waitq);
735 
736                         list_del(&addrw->list);
737                         kfree(addrw);
738                 }
739                 spin_unlock_bh(&net->sctp.addr_wq_lock);
740                 return;
741         }
742 
743         /* OK, we have to add the new address to the wait queue */
744         addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
745         if (addrw == NULL) {
746                 spin_unlock_bh(&net->sctp.addr_wq_lock);
747                 return;
748         }
749         addrw->state = cmd;
750         list_add_tail(&addrw->list, &net->sctp.addr_waitq);
751 
752         pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
753                  __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
754 
755         if (!timer_pending(&net->sctp.addr_wq_timer)) {
756                 timeo_val = jiffies;
757                 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
758                 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
759         }
760         spin_unlock_bh(&net->sctp.addr_wq_lock);
761 }
762 
763 /* Event handler for inet address addition/deletion events.
764  * The sctp_local_addr_list needs to be protocted by a spin lock since
765  * multiple notifiers (say IPv4 and IPv6) may be running at the same
766  * time and thus corrupt the list.
767  * The reader side is protected with RCU.
768  */
769 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
770                                void *ptr)
771 {
772         struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
773         struct sctp_sockaddr_entry *addr = NULL;
774         struct sctp_sockaddr_entry *temp;
775         struct net *net = dev_net(ifa->ifa_dev->dev);
776         int found = 0;
777 
778         switch (ev) {
779         case NETDEV_UP:
780                 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
781                 if (addr) {
782                         addr->a.v4.sin_family = AF_INET;
783                         addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
784                         addr->valid = 1;
785                         spin_lock_bh(&net->sctp.local_addr_lock);
786                         list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
787                         sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
788                         spin_unlock_bh(&net->sctp.local_addr_lock);
789                 }
790                 break;
791         case NETDEV_DOWN:
792                 spin_lock_bh(&net->sctp.local_addr_lock);
793                 list_for_each_entry_safe(addr, temp,
794                                         &net->sctp.local_addr_list, list) {
795                         if (addr->a.sa.sa_family == AF_INET &&
796                                         addr->a.v4.sin_addr.s_addr ==
797                                         ifa->ifa_local) {
798                                 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
799                                 found = 1;
800                                 addr->valid = 0;
801                                 list_del_rcu(&addr->list);
802                                 break;
803                         }
804                 }
805                 spin_unlock_bh(&net->sctp.local_addr_lock);
806                 if (found)
807                         kfree_rcu(addr, rcu);
808                 break;
809         }
810 
811         return NOTIFY_DONE;
812 }
813 
814 /*
815  * Initialize the control inode/socket with a control endpoint data
816  * structure.  This endpoint is reserved exclusively for the OOTB processing.
817  */
818 static int sctp_ctl_sock_init(struct net *net)
819 {
820         int err;
821         sa_family_t family = PF_INET;
822 
823         if (sctp_get_pf_specific(PF_INET6))
824                 family = PF_INET6;
825 
826         err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
827                                    SOCK_SEQPACKET, IPPROTO_SCTP, net);
828 
829         /* If IPv6 socket could not be created, try the IPv4 socket */
830         if (err < 0 && family == PF_INET6)
831                 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
832                                            SOCK_SEQPACKET, IPPROTO_SCTP,
833                                            net);
834 
835         if (err < 0) {
836                 pr_err("Failed to create the SCTP control socket\n");
837                 return err;
838         }
839         return 0;
840 }
841 
842 /* Register address family specific functions. */
843 int sctp_register_af(struct sctp_af *af)
844 {
845         switch (af->sa_family) {
846         case AF_INET:
847                 if (sctp_af_v4_specific)
848                         return 0;
849                 sctp_af_v4_specific = af;
850                 break;
851         case AF_INET6:
852                 if (sctp_af_v6_specific)
853                         return 0;
854                 sctp_af_v6_specific = af;
855                 break;
856         default:
857                 return 0;
858         }
859 
860         INIT_LIST_HEAD(&af->list);
861         list_add_tail(&af->list, &sctp_address_families);
862         return 1;
863 }
864 
865 /* Get the table of functions for manipulating a particular address
866  * family.
867  */
868 struct sctp_af *sctp_get_af_specific(sa_family_t family)
869 {
870         switch (family) {
871         case AF_INET:
872                 return sctp_af_v4_specific;
873         case AF_INET6:
874                 return sctp_af_v6_specific;
875         default:
876                 return NULL;
877         }
878 }
879 
880 /* Common code to initialize a AF_INET msg_name. */
881 static void sctp_inet_msgname(char *msgname, int *addr_len)
882 {
883         struct sockaddr_in *sin;
884 
885         sin = (struct sockaddr_in *)msgname;
886         *addr_len = sizeof(struct sockaddr_in);
887         sin->sin_family = AF_INET;
888         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
889 }
890 
891 /* Copy the primary address of the peer primary address as the msg_name. */
892 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
893                                     int *addr_len)
894 {
895         struct sockaddr_in *sin, *sinfrom;
896 
897         if (msgname) {
898                 struct sctp_association *asoc;
899 
900                 asoc = event->asoc;
901                 sctp_inet_msgname(msgname, addr_len);
902                 sin = (struct sockaddr_in *)msgname;
903                 sinfrom = &asoc->peer.primary_addr.v4;
904                 sin->sin_port = htons(asoc->peer.port);
905                 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
906         }
907 }
908 
909 /* Initialize and copy out a msgname from an inbound skb. */
910 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
911 {
912         if (msgname) {
913                 struct sctphdr *sh = sctp_hdr(skb);
914                 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
915 
916                 sctp_inet_msgname(msgname, len);
917                 sin->sin_port = sh->source;
918                 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
919         }
920 }
921 
922 /* Do we support this AF? */
923 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
924 {
925         /* PF_INET only supports AF_INET addresses. */
926         return AF_INET == family;
927 }
928 
929 /* Address matching with wildcards allowed. */
930 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
931                               const union sctp_addr *addr2,
932                               struct sctp_sock *opt)
933 {
934         /* PF_INET only supports AF_INET addresses. */
935         if (addr1->sa.sa_family != addr2->sa.sa_family)
936                 return 0;
937         if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
938             htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
939                 return 1;
940         if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
941                 return 1;
942 
943         return 0;
944 }
945 
946 /* Verify that provided sockaddr looks bindable.  Common verification has
947  * already been taken care of.
948  */
949 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
950 {
951         return sctp_v4_available(addr, opt);
952 }
953 
954 /* Verify that sockaddr looks sendable.  Common verification has already
955  * been taken care of.
956  */
957 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
958 {
959         return 1;
960 }
961 
962 /* Fill in Supported Address Type information for INIT and INIT-ACK
963  * chunks.  Returns number of addresses supported.
964  */
965 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
966                                      __be16 *types)
967 {
968         types[0] = SCTP_PARAM_IPV4_ADDRESS;
969         return 1;
970 }
971 
972 /* Wrapper routine that calls the ip transmit routine. */
973 static inline int sctp_v4_xmit(struct sk_buff *skb,
974                                struct sctp_transport *transport)
975 {
976         struct inet_sock *inet = inet_sk(skb->sk);
977         __u8 dscp = inet->tos;
978 
979         pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
980                  skb->len, &transport->fl.u.ip4.saddr,
981                  &transport->fl.u.ip4.daddr);
982 
983         if (transport->dscp & SCTP_DSCP_SET_MASK)
984                 dscp = transport->dscp & SCTP_DSCP_VAL_MASK;
985 
986         inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
987                          IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
988 
989         SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
990 
991         return __ip_queue_xmit(&inet->sk, skb, &transport->fl, dscp);
992 }
993 
994 static struct sctp_af sctp_af_inet;
995 
996 static struct sctp_pf sctp_pf_inet = {
997         .event_msgname = sctp_inet_event_msgname,
998         .skb_msgname   = sctp_inet_skb_msgname,
999         .af_supported  = sctp_inet_af_supported,
1000         .cmp_addr      = sctp_inet_cmp_addr,
1001         .bind_verify   = sctp_inet_bind_verify,
1002         .send_verify   = sctp_inet_send_verify,
1003         .supported_addrs = sctp_inet_supported_addrs,
1004         .create_accept_sk = sctp_v4_create_accept_sk,
1005         .addr_to_user  = sctp_v4_addr_to_user,
1006         .to_sk_saddr   = sctp_v4_to_sk_saddr,
1007         .to_sk_daddr   = sctp_v4_to_sk_daddr,
1008         .copy_ip_options = sctp_v4_copy_ip_options,
1009         .af            = &sctp_af_inet
1010 };
1011 
1012 /* Notifier for inetaddr addition/deletion events.  */
1013 static struct notifier_block sctp_inetaddr_notifier = {
1014         .notifier_call = sctp_inetaddr_event,
1015 };
1016 
1017 /* Socket operations.  */
1018 static const struct proto_ops inet_seqpacket_ops = {
1019         .family            = PF_INET,
1020         .owner             = THIS_MODULE,
1021         .release           = inet_release,      /* Needs to be wrapped... */
1022         .bind              = inet_bind,
1023         .connect           = sctp_inet_connect,
1024         .socketpair        = sock_no_socketpair,
1025         .accept            = inet_accept,
1026         .getname           = inet_getname,      /* Semantics are different.  */
1027         .poll              = sctp_poll,
1028         .ioctl             = inet_ioctl,
1029         .listen            = sctp_inet_listen,
1030         .shutdown          = inet_shutdown,     /* Looks harmless.  */
1031         .setsockopt        = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1032         .getsockopt        = sock_common_getsockopt,
1033         .sendmsg           = inet_sendmsg,
1034         .recvmsg           = inet_recvmsg,
1035         .mmap              = sock_no_mmap,
1036         .sendpage          = sock_no_sendpage,
1037 #ifdef CONFIG_COMPAT
1038         .compat_setsockopt = compat_sock_common_setsockopt,
1039         .compat_getsockopt = compat_sock_common_getsockopt,
1040 #endif
1041 };
1042 
1043 /* Registration with AF_INET family.  */
1044 static struct inet_protosw sctp_seqpacket_protosw = {
1045         .type       = SOCK_SEQPACKET,
1046         .protocol   = IPPROTO_SCTP,
1047         .prot       = &sctp_prot,
1048         .ops        = &inet_seqpacket_ops,
1049         .flags      = SCTP_PROTOSW_FLAG
1050 };
1051 static struct inet_protosw sctp_stream_protosw = {
1052         .type       = SOCK_STREAM,
1053         .protocol   = IPPROTO_SCTP,
1054         .prot       = &sctp_prot,
1055         .ops        = &inet_seqpacket_ops,
1056         .flags      = SCTP_PROTOSW_FLAG
1057 };
1058 
1059 /* Register with IP layer.  */
1060 static const struct net_protocol sctp_protocol = {
1061         .handler     = sctp_rcv,
1062         .err_handler = sctp_v4_err,
1063         .no_policy   = 1,
1064         .netns_ok    = 1,
1065         .icmp_strict_tag_validation = 1,
1066 };
1067 
1068 /* IPv4 address related functions.  */
1069 static struct sctp_af sctp_af_inet = {
1070         .sa_family         = AF_INET,
1071         .sctp_xmit         = sctp_v4_xmit,
1072         .setsockopt        = ip_setsockopt,
1073         .getsockopt        = ip_getsockopt,
1074         .get_dst           = sctp_v4_get_dst,
1075         .get_saddr         = sctp_v4_get_saddr,
1076         .copy_addrlist     = sctp_v4_copy_addrlist,
1077         .from_skb          = sctp_v4_from_skb,
1078         .from_sk           = sctp_v4_from_sk,
1079         .from_addr_param   = sctp_v4_from_addr_param,
1080         .to_addr_param     = sctp_v4_to_addr_param,
1081         .cmp_addr          = sctp_v4_cmp_addr,
1082         .addr_valid        = sctp_v4_addr_valid,
1083         .inaddr_any        = sctp_v4_inaddr_any,
1084         .is_any            = sctp_v4_is_any,
1085         .available         = sctp_v4_available,
1086         .scope             = sctp_v4_scope,
1087         .skb_iif           = sctp_v4_skb_iif,
1088         .is_ce             = sctp_v4_is_ce,
1089         .seq_dump_addr     = sctp_v4_seq_dump_addr,
1090         .ecn_capable       = sctp_v4_ecn_capable,
1091         .net_header_len    = sizeof(struct iphdr),
1092         .sockaddr_len      = sizeof(struct sockaddr_in),
1093         .ip_options_len    = sctp_v4_ip_options_len,
1094 #ifdef CONFIG_COMPAT
1095         .compat_setsockopt = compat_ip_setsockopt,
1096         .compat_getsockopt = compat_ip_getsockopt,
1097 #endif
1098 };
1099 
1100 struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
1101 {
1102         switch (family) {
1103         case PF_INET:
1104                 return sctp_pf_inet_specific;
1105         case PF_INET6:
1106                 return sctp_pf_inet6_specific;
1107         default:
1108                 return NULL;
1109         }
1110 }
1111 
1112 /* Register the PF specific function table.  */
1113 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1114 {
1115         switch (family) {
1116         case PF_INET:
1117                 if (sctp_pf_inet_specific)
1118                         return 0;
1119                 sctp_pf_inet_specific = pf;
1120                 break;
1121         case PF_INET6:
1122                 if (sctp_pf_inet6_specific)
1123                         return 0;
1124                 sctp_pf_inet6_specific = pf;
1125                 break;
1126         default:
1127                 return 0;
1128         }
1129         return 1;
1130 }
1131 
1132 static inline int init_sctp_mibs(struct net *net)
1133 {
1134         net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib);
1135         if (!net->sctp.sctp_statistics)
1136                 return -ENOMEM;
1137         return 0;
1138 }
1139 
1140 static inline void cleanup_sctp_mibs(struct net *net)
1141 {
1142         free_percpu(net->sctp.sctp_statistics);
1143 }
1144 
1145 static void sctp_v4_pf_init(void)
1146 {
1147         /* Initialize the SCTP specific PF functions. */
1148         sctp_register_pf(&sctp_pf_inet, PF_INET);
1149         sctp_register_af(&sctp_af_inet);
1150 }
1151 
1152 static void sctp_v4_pf_exit(void)
1153 {
1154         list_del(&sctp_af_inet.list);
1155 }
1156 
1157 static int sctp_v4_protosw_init(void)
1158 {
1159         int rc;
1160 
1161         rc = proto_register(&sctp_prot, 1);
1162         if (rc)
1163                 return rc;
1164 
1165         /* Register SCTP(UDP and TCP style) with socket layer.  */
1166         inet_register_protosw(&sctp_seqpacket_protosw);
1167         inet_register_protosw(&sctp_stream_protosw);
1168 
1169         return 0;
1170 }
1171 
1172 static void sctp_v4_protosw_exit(void)
1173 {
1174         inet_unregister_protosw(&sctp_stream_protosw);
1175         inet_unregister_protosw(&sctp_seqpacket_protosw);
1176         proto_unregister(&sctp_prot);
1177 }
1178 
1179 static int sctp_v4_add_protocol(void)
1180 {
1181         /* Register notifier for inet address additions/deletions. */
1182         register_inetaddr_notifier(&sctp_inetaddr_notifier);
1183 
1184         /* Register SCTP with inet layer.  */
1185         if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1186                 return -EAGAIN;
1187 
1188         return 0;
1189 }
1190 
1191 static void sctp_v4_del_protocol(void)
1192 {
1193         inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1194         unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1195 }
1196 
1197 static int __net_init sctp_defaults_init(struct net *net)
1198 {
1199         int status;
1200 
1201         /*
1202          * 14. Suggested SCTP Protocol Parameter Values
1203          */
1204         /* The following protocol parameters are RECOMMENDED:  */
1205         /* RTO.Initial              - 3  seconds */
1206         net->sctp.rto_initial                   = SCTP_RTO_INITIAL;
1207         /* RTO.Min                  - 1  second */
1208         net->sctp.rto_min                       = SCTP_RTO_MIN;
1209         /* RTO.Max                 -  60 seconds */
1210         net->sctp.rto_max                       = SCTP_RTO_MAX;
1211         /* RTO.Alpha                - 1/8 */
1212         net->sctp.rto_alpha                     = SCTP_RTO_ALPHA;
1213         /* RTO.Beta                 - 1/4 */
1214         net->sctp.rto_beta                      = SCTP_RTO_BETA;
1215 
1216         /* Valid.Cookie.Life        - 60  seconds */
1217         net->sctp.valid_cookie_life             = SCTP_DEFAULT_COOKIE_LIFE;
1218 
1219         /* Whether Cookie Preservative is enabled(1) or not(0) */
1220         net->sctp.cookie_preserve_enable        = 1;
1221 
1222         /* Default sctp sockets to use md5 as their hmac alg */
1223 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1224         net->sctp.sctp_hmac_alg                 = "md5";
1225 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1226         net->sctp.sctp_hmac_alg                 = "sha1";
1227 #else
1228         net->sctp.sctp_hmac_alg                 = NULL;
1229 #endif
1230 
1231         /* Max.Burst                - 4 */
1232         net->sctp.max_burst                     = SCTP_DEFAULT_MAX_BURST;
1233 
1234         /* Enable pf state by default */
1235         net->sctp.pf_enable = 1;
1236 
1237         /* Association.Max.Retrans  - 10 attempts
1238          * Path.Max.Retrans         - 5  attempts (per destination address)
1239          * Max.Init.Retransmits     - 8  attempts
1240          */
1241         net->sctp.max_retrans_association       = 10;
1242         net->sctp.max_retrans_path              = 5;
1243         net->sctp.max_retrans_init              = 8;
1244 
1245         /* Sendbuffer growth        - do per-socket accounting */
1246         net->sctp.sndbuf_policy                 = 0;
1247 
1248         /* Rcvbuffer growth         - do per-socket accounting */
1249         net->sctp.rcvbuf_policy                 = 0;
1250 
1251         /* HB.interval              - 30 seconds */
1252         net->sctp.hb_interval                   = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1253 
1254         /* delayed SACK timeout */
1255         net->sctp.sack_timeout                  = SCTP_DEFAULT_TIMEOUT_SACK;
1256 
1257         /* Disable ADDIP by default. */
1258         net->sctp.addip_enable = 0;
1259         net->sctp.addip_noauth = 0;
1260         net->sctp.default_auto_asconf = 0;
1261 
1262         /* Enable PR-SCTP by default. */
1263         net->sctp.prsctp_enable = 1;
1264 
1265         /* Disable RECONF by default. */
1266         net->sctp.reconf_enable = 0;
1267 
1268         /* Disable AUTH by default. */
1269         net->sctp.auth_enable = 0;
1270 
1271         /* Set SCOPE policy to enabled */
1272         net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1273 
1274         /* Set the default rwnd update threshold */
1275         net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1276 
1277         /* Initialize maximum autoclose timeout. */
1278         net->sctp.max_autoclose         = INT_MAX / HZ;
1279 
1280         status = sctp_sysctl_net_register(net);
1281         if (status)
1282                 goto err_sysctl_register;
1283 
1284         /* Allocate and initialise sctp mibs.  */
1285         status = init_sctp_mibs(net);
1286         if (status)
1287                 goto err_init_mibs;
1288 
1289 #ifdef CONFIG_PROC_FS
1290         /* Initialize proc fs directory.  */
1291         status = sctp_proc_init(net);
1292         if (status)
1293                 goto err_init_proc;
1294 #endif
1295 
1296         sctp_dbg_objcnt_init(net);
1297 
1298         /* Initialize the local address list. */
1299         INIT_LIST_HEAD(&net->sctp.local_addr_list);
1300         spin_lock_init(&net->sctp.local_addr_lock);
1301         sctp_get_local_addr_list(net);
1302 
1303         /* Initialize the address event list */
1304         INIT_LIST_HEAD(&net->sctp.addr_waitq);
1305         INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1306         spin_lock_init(&net->sctp.addr_wq_lock);
1307         net->sctp.addr_wq_timer.expires = 0;
1308         timer_setup(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler, 0);
1309 
1310         return 0;
1311 
1312 #ifdef CONFIG_PROC_FS
1313 err_init_proc:
1314         cleanup_sctp_mibs(net);
1315 #endif
1316 err_init_mibs:
1317         sctp_sysctl_net_unregister(net);
1318 err_sysctl_register:
1319         return status;
1320 }
1321 
1322 static void __net_exit sctp_defaults_exit(struct net *net)
1323 {
1324         /* Free the local address list */
1325         sctp_free_addr_wq(net);
1326         sctp_free_local_addr_list(net);
1327 
1328 #ifdef CONFIG_PROC_FS
1329         remove_proc_subtree("sctp", net->proc_net);
1330         net->sctp.proc_net_sctp = NULL;
1331 #endif
1332         cleanup_sctp_mibs(net);
1333         sctp_sysctl_net_unregister(net);
1334 }
1335 
1336 static struct pernet_operations sctp_defaults_ops = {
1337         .init = sctp_defaults_init,
1338         .exit = sctp_defaults_exit,
1339 };
1340 
1341 static int __net_init sctp_ctrlsock_init(struct net *net)
1342 {
1343         int status;
1344 
1345         /* Initialize the control inode/socket for handling OOTB packets.  */
1346         status = sctp_ctl_sock_init(net);
1347         if (status)
1348                 pr_err("Failed to initialize the SCTP control sock\n");
1349 
1350         return status;
1351 }
1352 
1353 static void __net_init sctp_ctrlsock_exit(struct net *net)
1354 {
1355         /* Free the control endpoint.  */
1356         inet_ctl_sock_destroy(net->sctp.ctl_sock);
1357 }
1358 
1359 static struct pernet_operations sctp_ctrlsock_ops = {
1360         .init = sctp_ctrlsock_init,
1361         .exit = sctp_ctrlsock_exit,
1362 };
1363 
1364 /* Initialize the universe into something sensible.  */
1365 static __init int sctp_init(void)
1366 {
1367         int i;
1368         int status = -EINVAL;
1369         unsigned long goal;
1370         unsigned long limit;
1371         unsigned long nr_pages = totalram_pages();
1372         int max_share;
1373         int order;
1374         int num_entries;
1375         int max_entry_order;
1376 
1377         sock_skb_cb_check_size(sizeof(struct sctp_ulpevent));
1378 
1379         /* Allocate bind_bucket and chunk caches. */
1380         status = -ENOBUFS;
1381         sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1382                                                sizeof(struct sctp_bind_bucket),
1383                                                0, SLAB_HWCACHE_ALIGN,
1384                                                NULL);
1385         if (!sctp_bucket_cachep)
1386                 goto out;
1387 
1388         sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1389                                                sizeof(struct sctp_chunk),
1390                                                0, SLAB_HWCACHE_ALIGN,
1391                                                NULL);
1392         if (!sctp_chunk_cachep)
1393                 goto err_chunk_cachep;
1394 
1395         status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL);
1396         if (status)
1397                 goto err_percpu_counter_init;
1398 
1399         /* Implementation specific variables. */
1400 
1401         /* Initialize default stream count setup information. */
1402         sctp_max_instreams              = SCTP_DEFAULT_INSTREAMS;
1403         sctp_max_outstreams             = SCTP_DEFAULT_OUTSTREAMS;
1404 
1405         /* Initialize handle used for association ids. */
1406         idr_init(&sctp_assocs_id);
1407 
1408         limit = nr_free_buffer_pages() / 8;
1409         limit = max(limit, 128UL);
1410         sysctl_sctp_mem[0] = limit / 4 * 3;
1411         sysctl_sctp_mem[1] = limit;
1412         sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1413 
1414         /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1415         limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1416         max_share = min(4UL*1024*1024, limit);
1417 
1418         sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1419         sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1420         sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1421 
1422         sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1423         sysctl_sctp_wmem[1] = 16*1024;
1424         sysctl_sctp_wmem[2] = max(64*1024, max_share);
1425 
1426         /* Size and allocate the association hash table.
1427          * The methodology is similar to that of the tcp hash tables.
1428          * Though not identical.  Start by getting a goal size
1429          */
1430         if (nr_pages >= (128 * 1024))
1431                 goal = nr_pages >> (22 - PAGE_SHIFT);
1432         else
1433                 goal = nr_pages >> (24 - PAGE_SHIFT);
1434 
1435         /* Then compute the page order for said goal */
1436         order = get_order(goal);
1437 
1438         /* Now compute the required page order for the maximum sized table we
1439          * want to create
1440          */
1441         max_entry_order = get_order(MAX_SCTP_PORT_HASH_ENTRIES *
1442                                     sizeof(struct sctp_bind_hashbucket));
1443 
1444         /* Limit the page order by that maximum hash table size */
1445         order = min(order, max_entry_order);
1446 
1447         /* Allocate and initialize the endpoint hash table.  */
1448         sctp_ep_hashsize = 64;
1449         sctp_ep_hashtable =
1450                 kmalloc_array(64, sizeof(struct sctp_hashbucket), GFP_KERNEL);
1451         if (!sctp_ep_hashtable) {
1452                 pr_err("Failed endpoint_hash alloc\n");
1453                 status = -ENOMEM;
1454                 goto err_ehash_alloc;
1455         }
1456         for (i = 0; i < sctp_ep_hashsize; i++) {
1457                 rwlock_init(&sctp_ep_hashtable[i].lock);
1458                 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1459         }
1460 
1461         /* Allocate and initialize the SCTP port hash table.
1462          * Note that order is initalized to start at the max sized
1463          * table we want to support.  If we can't get that many pages
1464          * reduce the order and try again
1465          */
1466         do {
1467                 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1468                         __get_free_pages(GFP_KERNEL | __GFP_NOWARN, order);
1469         } while (!sctp_port_hashtable && --order > 0);
1470 
1471         if (!sctp_port_hashtable) {
1472                 pr_err("Failed bind hash alloc\n");
1473                 status = -ENOMEM;
1474                 goto err_bhash_alloc;
1475         }
1476 
1477         /* Now compute the number of entries that will fit in the
1478          * port hash space we allocated
1479          */
1480         num_entries = (1UL << order) * PAGE_SIZE /
1481                       sizeof(struct sctp_bind_hashbucket);
1482 
1483         /* And finish by rounding it down to the nearest power of two
1484          * this wastes some memory of course, but its needed because
1485          * the hash function operates based on the assumption that
1486          * that the number of entries is a power of two
1487          */
1488         sctp_port_hashsize = rounddown_pow_of_two(num_entries);
1489 
1490         for (i = 0; i < sctp_port_hashsize; i++) {
1491                 spin_lock_init(&sctp_port_hashtable[i].lock);
1492                 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1493         }
1494 
1495         status = sctp_transport_hashtable_init();
1496         if (status)
1497                 goto err_thash_alloc;
1498 
1499         pr_info("Hash tables configured (bind %d/%d)\n", sctp_port_hashsize,
1500                 num_entries);
1501 
1502         sctp_sysctl_register();
1503 
1504         INIT_LIST_HEAD(&sctp_address_families);
1505         sctp_v4_pf_init();
1506         sctp_v6_pf_init();
1507         sctp_sched_ops_init();
1508 
1509         status = register_pernet_subsys(&sctp_defaults_ops);
1510         if (status)
1511                 goto err_register_defaults;
1512 
1513         status = sctp_v4_protosw_init();
1514         if (status)
1515                 goto err_protosw_init;
1516 
1517         status = sctp_v6_protosw_init();
1518         if (status)
1519                 goto err_v6_protosw_init;
1520 
1521         status = register_pernet_subsys(&sctp_ctrlsock_ops);
1522         if (status)
1523                 goto err_register_ctrlsock;
1524 
1525         status = sctp_v4_add_protocol();
1526         if (status)
1527                 goto err_add_protocol;
1528 
1529         /* Register SCTP with inet6 layer.  */
1530         status = sctp_v6_add_protocol();
1531         if (status)
1532                 goto err_v6_add_protocol;
1533 
1534         if (sctp_offload_init() < 0)
1535                 pr_crit("%s: Cannot add SCTP protocol offload\n", __func__);
1536 
1537 out:
1538         return status;
1539 err_v6_add_protocol:
1540         sctp_v4_del_protocol();
1541 err_add_protocol:
1542         unregister_pernet_subsys(&sctp_ctrlsock_ops);
1543 err_register_ctrlsock:
1544         sctp_v6_protosw_exit();
1545 err_v6_protosw_init:
1546         sctp_v4_protosw_exit();
1547 err_protosw_init:
1548         unregister_pernet_subsys(&sctp_defaults_ops);
1549 err_register_defaults:
1550         sctp_v4_pf_exit();
1551         sctp_v6_pf_exit();
1552         sctp_sysctl_unregister();
1553         free_pages((unsigned long)sctp_port_hashtable,
1554                    get_order(sctp_port_hashsize *
1555                              sizeof(struct sctp_bind_hashbucket)));
1556 err_bhash_alloc:
1557         sctp_transport_hashtable_destroy();
1558 err_thash_alloc:
1559         kfree(sctp_ep_hashtable);
1560 err_ehash_alloc:
1561         percpu_counter_destroy(&sctp_sockets_allocated);
1562 err_percpu_counter_init:
1563         kmem_cache_destroy(sctp_chunk_cachep);
1564 err_chunk_cachep:
1565         kmem_cache_destroy(sctp_bucket_cachep);
1566         goto out;
1567 }
1568 
1569 /* Exit handler for the SCTP protocol.  */
1570 static __exit void sctp_exit(void)
1571 {
1572         /* BUG.  This should probably do something useful like clean
1573          * up all the remaining associations and all that memory.
1574          */
1575 
1576         /* Unregister with inet6/inet layers. */
1577         sctp_v6_del_protocol();
1578         sctp_v4_del_protocol();
1579 
1580         unregister_pernet_subsys(&sctp_ctrlsock_ops);
1581 
1582         /* Free protosw registrations */
1583         sctp_v6_protosw_exit();
1584         sctp_v4_protosw_exit();
1585 
1586         unregister_pernet_subsys(&sctp_defaults_ops);
1587 
1588         /* Unregister with socket layer. */
1589         sctp_v6_pf_exit();
1590         sctp_v4_pf_exit();
1591 
1592         sctp_sysctl_unregister();
1593 
1594         free_pages((unsigned long)sctp_port_hashtable,
1595                    get_order(sctp_port_hashsize *
1596                              sizeof(struct sctp_bind_hashbucket)));
1597         kfree(sctp_ep_hashtable);
1598         sctp_transport_hashtable_destroy();
1599 
1600         percpu_counter_destroy(&sctp_sockets_allocated);
1601 
1602         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1603 
1604         kmem_cache_destroy(sctp_chunk_cachep);
1605         kmem_cache_destroy(sctp_bucket_cachep);
1606 }
1607 
1608 module_init(sctp_init);
1609 module_exit(sctp_exit);
1610 
1611 /*
1612  * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1613  */
1614 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1615 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1616 MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
1617 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1618 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1619 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1620 MODULE_LICENSE("GPL");
1621 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp