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

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

Version: ~ [ linux-5.19-rc3 ] ~ [ linux-5.18.5 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.48 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.123 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.199 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.248 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.284 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.319 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /* SCTP kernel implementation
  2  * (C) Copyright IBM Corp. 2001, 2004
  3  * Copyright (c) 1999-2000 Cisco, Inc.
  4  * Copyright (c) 1999-2001 Motorola, Inc.
  5  * Copyright (c) 2001 Intel Corp.
  6  * Copyright (c) 2001 Nokia, Inc.
  7  * Copyright (c) 2001 La Monte H.P. Yarroll
  8  *
  9  * This file is part of the SCTP kernel implementation
 10  *
 11  * Initialization/cleanup for SCTP protocol support.
 12  *
 13  * This SCTP implementation is free software;
 14  * you can redistribute it and/or modify it under the terms of
 15  * the GNU General Public License as published by
 16  * the Free Software Foundation; either version 2, or (at your option)
 17  * any later version.
 18  *
 19  * This SCTP implementation is distributed in the hope that it
 20  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
 21  *                 ************************
 22  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 23  * See the GNU General Public License for more details.
 24  *
 25  * You should have received a copy of the GNU General Public License
 26  * along with GNU CC; see the file COPYING.  If not, see
 27  * <http://www.gnu.org/licenses/>.
 28  *
 29  * Please send any bug reports or fixes you make to the
 30  * email address(es):
 31  *    lksctp developers <linux-sctp@vger.kernel.org>
 32  *
 33  * Written or modified by:
 34  *    La Monte H.P. Yarroll <piggy@acm.org>
 35  *    Karl Knutson <karl@athena.chicago.il.us>
 36  *    Jon Grimm <jgrimm@us.ibm.com>
 37  *    Sridhar Samudrala <sri@us.ibm.com>
 38  *    Daisy Chang <daisyc@us.ibm.com>
 39  *    Ardelle Fan <ardelle.fan@intel.com>
 40  */
 41 
 42 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 43 
 44 #include <linux/module.h>
 45 #include <linux/init.h>
 46 #include <linux/netdevice.h>
 47 #include <linux/inetdevice.h>
 48 #include <linux/seq_file.h>
 49 #include <linux/bootmem.h>
 50 #include <linux/highmem.h>
 51 #include <linux/swap.h>
 52 #include <linux/slab.h>
 53 #include <net/net_namespace.h>
 54 #include <net/protocol.h>
 55 #include <net/ip.h>
 56 #include <net/ipv6.h>
 57 #include <net/route.h>
 58 #include <net/sctp/sctp.h>
 59 #include <net/addrconf.h>
 60 #include <net/inet_common.h>
 61 #include <net/inet_ecn.h>
 62 
 63 #define MAX_SCTP_PORT_HASH_ENTRIES (64 * 1024)
 64 
 65 /* Global data structures. */
 66 struct sctp_globals sctp_globals __read_mostly;
 67 
 68 struct idr sctp_assocs_id;
 69 DEFINE_SPINLOCK(sctp_assocs_id_lock);
 70 
 71 static struct sctp_pf *sctp_pf_inet6_specific;
 72 static struct sctp_pf *sctp_pf_inet_specific;
 73 static struct sctp_af *sctp_af_v4_specific;
 74 static struct sctp_af *sctp_af_v6_specific;
 75 
 76 struct kmem_cache *sctp_chunk_cachep __read_mostly;
 77 struct kmem_cache *sctp_bucket_cachep __read_mostly;
 78 
 79 long sysctl_sctp_mem[3];
 80 int sysctl_sctp_rmem[3];
 81 int sysctl_sctp_wmem[3];
 82 
 83 /* 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_port = 0;
105                         addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
106                         addr->valid = 1;
107                         INIT_LIST_HEAD(&addr->list);
108                         list_add_tail(&addr->list, addrlist);
109                 }
110         }
111 
112         rcu_read_unlock();
113 }
114 
115 /* Extract our IP addresses from the system and stash them in the
116  * protocol structure.
117  */
118 static void sctp_get_local_addr_list(struct net *net)
119 {
120         struct net_device *dev;
121         struct list_head *pos;
122         struct sctp_af *af;
123 
124         rcu_read_lock();
125         for_each_netdev_rcu(net, dev) {
126                 list_for_each(pos, &sctp_address_families) {
127                         af = list_entry(pos, struct sctp_af, list);
128                         af->copy_addrlist(&net->sctp.local_addr_list, dev);
129                 }
130         }
131         rcu_read_unlock();
132 }
133 
134 /* Free the existing local addresses.  */
135 static void sctp_free_local_addr_list(struct net *net)
136 {
137         struct sctp_sockaddr_entry *addr;
138         struct list_head *pos, *temp;
139 
140         list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
141                 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
142                 list_del(pos);
143                 kfree(addr);
144         }
145 }
146 
147 /* Copy the local addresses which are valid for 'scope' into 'bp'.  */
148 int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
149                               enum sctp_scope scope, gfp_t gfp, int copy_flags)
150 {
151         struct sctp_sockaddr_entry *addr;
152         union sctp_addr laddr;
153         int error = 0;
154 
155         rcu_read_lock();
156         list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
157                 if (!addr->valid)
158                         continue;
159                 if (!sctp_in_scope(net, &addr->a, scope))
160                         continue;
161 
162                 /* Now that the address is in scope, check to see if
163                  * the address type is really supported by the local
164                  * sock as well as the remote peer.
165                  */
166                 if (addr->a.sa.sa_family == AF_INET &&
167                     !(copy_flags & SCTP_ADDR4_PEERSUPP))
168                         continue;
169                 if (addr->a.sa.sa_family == AF_INET6 &&
170                     (!(copy_flags & SCTP_ADDR6_ALLOWED) ||
171                      !(copy_flags & SCTP_ADDR6_PEERSUPP)))
172                         continue;
173 
174                 laddr = addr->a;
175                 /* also works for setting ipv6 address port */
176                 laddr.v4.sin_port = htons(bp->port);
177                 if (sctp_bind_addr_state(bp, &laddr) != -1)
178                         continue;
179 
180                 error = sctp_add_bind_addr(bp, &addr->a, sizeof(addr->a),
181                                            SCTP_ADDR_SRC, GFP_ATOMIC);
182                 if (error)
183                         break;
184         }
185 
186         rcu_read_unlock();
187         return error;
188 }
189 
190 /* Copy over any ip options */
191 static void sctp_v4_copy_ip_options(struct sock *sk, struct sock *newsk)
192 {
193         struct inet_sock *newinet, *inet = inet_sk(sk);
194         struct ip_options_rcu *inet_opt, *newopt = NULL;
195 
196         newinet = inet_sk(newsk);
197 
198         rcu_read_lock();
199         inet_opt = rcu_dereference(inet->inet_opt);
200         if (inet_opt) {
201                 newopt = sock_kmalloc(newsk, sizeof(*inet_opt) +
202                                       inet_opt->opt.optlen, GFP_ATOMIC);
203                 if (newopt)
204                         memcpy(newopt, inet_opt, sizeof(*inet_opt) +
205                                inet_opt->opt.optlen);
206                 else
207                         pr_err("%s: Failed to copy ip options\n", __func__);
208         }
209         RCU_INIT_POINTER(newinet->inet_opt, newopt);
210         rcu_read_unlock();
211 }
212 
213 /* Account for the IP options */
214 static int sctp_v4_ip_options_len(struct sock *sk)
215 {
216         struct inet_sock *inet = inet_sk(sk);
217         struct ip_options_rcu *inet_opt;
218         int len = 0;
219 
220         rcu_read_lock();
221         inet_opt = rcu_dereference(inet->inet_opt);
222         if (inet_opt)
223                 len = inet_opt->opt.optlen;
224 
225         rcu_read_unlock();
226         return len;
227 }
228 
229 /* Initialize a sctp_addr from in incoming skb.  */
230 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
231                              int is_saddr)
232 {
233         /* Always called on head skb, so this is safe */
234         struct sctphdr *sh = sctp_hdr(skb);
235         struct sockaddr_in *sa = &addr->v4;
236 
237         addr->v4.sin_family = AF_INET;
238 
239         if (is_saddr) {
240                 sa->sin_port = sh->source;
241                 sa->sin_addr.s_addr = ip_hdr(skb)->saddr;
242         } else {
243                 sa->sin_port = sh->dest;
244                 sa->sin_addr.s_addr = ip_hdr(skb)->daddr;
245         }
246 }
247 
248 /* Initialize an sctp_addr from a socket. */
249 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
250 {
251         addr->v4.sin_family = AF_INET;
252         addr->v4.sin_port = 0;
253         addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
254 }
255 
256 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
257 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
258 {
259         inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
260 }
261 
262 /* Initialize sk->sk_daddr from sctp_addr. */
263 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
264 {
265         inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
266 }
267 
268 /* Initialize a sctp_addr from an address parameter. */
269 static void sctp_v4_from_addr_param(union sctp_addr *addr,
270                                     union sctp_addr_param *param,
271                                     __be16 port, int iif)
272 {
273         addr->v4.sin_family = AF_INET;
274         addr->v4.sin_port = port;
275         addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
276 }
277 
278 /* Initialize an address parameter from a sctp_addr and return the length
279  * of the address parameter.
280  */
281 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
282                                  union sctp_addr_param *param)
283 {
284         int length = sizeof(struct sctp_ipv4addr_param);
285 
286         param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
287         param->v4.param_hdr.length = htons(length);
288         param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
289 
290         return length;
291 }
292 
293 /* Initialize a sctp_addr from a dst_entry. */
294 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
295                               __be16 port)
296 {
297         saddr->v4.sin_family = AF_INET;
298         saddr->v4.sin_port = port;
299         saddr->v4.sin_addr.s_addr = fl4->saddr;
300 }
301 
302 /* Compare two addresses exactly. */
303 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
304                             const union sctp_addr *addr2)
305 {
306         if (addr1->sa.sa_family != addr2->sa.sa_family)
307                 return 0;
308         if (addr1->v4.sin_port != addr2->v4.sin_port)
309                 return 0;
310         if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
311                 return 0;
312 
313         return 1;
314 }
315 
316 /* Initialize addr struct to INADDR_ANY. */
317 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
318 {
319         addr->v4.sin_family = AF_INET;
320         addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
321         addr->v4.sin_port = port;
322 }
323 
324 /* Is this a wildcard address? */
325 static int sctp_v4_is_any(const union sctp_addr *addr)
326 {
327         return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
328 }
329 
330 /* This function checks if the address is a valid address to be used for
331  * SCTP binding.
332  *
333  * Output:
334  * Return 0 - If the address is a non-unicast or an illegal address.
335  * Return 1 - If the address is a unicast.
336  */
337 static int sctp_v4_addr_valid(union sctp_addr *addr,
338                               struct sctp_sock *sp,
339                               const struct sk_buff *skb)
340 {
341         /* IPv4 addresses not allowed */
342         if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
343                 return 0;
344 
345         /* Is this a non-unicast address or a unusable SCTP address? */
346         if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
347                 return 0;
348 
349         /* Is this a broadcast address? */
350         if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
351                 return 0;
352 
353         return 1;
354 }
355 
356 /* Should this be available for binding?   */
357 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
358 {
359         struct net *net = sock_net(&sp->inet.sk);
360         int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
361 
362 
363         if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
364            ret != RTN_LOCAL &&
365            !sp->inet.freebind &&
366            !net->ipv4.sysctl_ip_nonlocal_bind)
367                 return 0;
368 
369         if (ipv6_only_sock(sctp_opt2sk(sp)))
370                 return 0;
371 
372         return 1;
373 }
374 
375 /* Checking the loopback, private and other address scopes as defined in
376  * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
377  * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
378  *
379  * Level 0 - unusable SCTP addresses
380  * Level 1 - loopback address
381  * Level 2 - link-local addresses
382  * Level 3 - private addresses.
383  * Level 4 - global addresses
384  * For INIT and INIT-ACK address list, let L be the level of
385  * of requested destination address, sender and receiver
386  * SHOULD include all of its addresses with level greater
387  * than or equal to L.
388  *
389  * IPv4 scoping can be controlled through sysctl option
390  * net.sctp.addr_scope_policy
391  */
392 static enum sctp_scope sctp_v4_scope(union sctp_addr *addr)
393 {
394         enum sctp_scope retval;
395 
396         /* Check for unusable SCTP addresses. */
397         if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
398                 retval =  SCTP_SCOPE_UNUSABLE;
399         } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
400                 retval = SCTP_SCOPE_LOOPBACK;
401         } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
402                 retval = SCTP_SCOPE_LINK;
403         } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
404                    ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
405                    ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
406                 retval = SCTP_SCOPE_PRIVATE;
407         } else {
408                 retval = SCTP_SCOPE_GLOBAL;
409         }
410 
411         return retval;
412 }
413 
414 /* Returns a valid dst cache entry for the given source and destination ip
415  * addresses. If an association is passed, trys to get a dst entry with a
416  * source address that matches an address in the bind address list.
417  */
418 static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
419                                 struct flowi *fl, struct sock *sk)
420 {
421         struct sctp_association *asoc = t->asoc;
422         struct rtable *rt;
423         struct flowi4 *fl4 = &fl->u.ip4;
424         struct sctp_bind_addr *bp;
425         struct sctp_sockaddr_entry *laddr;
426         struct dst_entry *dst = NULL;
427         union sctp_addr *daddr = &t->ipaddr;
428         union sctp_addr dst_saddr;
429 
430         memset(fl4, 0x0, sizeof(struct flowi4));
431         fl4->daddr  = daddr->v4.sin_addr.s_addr;
432         fl4->fl4_dport = daddr->v4.sin_port;
433         fl4->flowi4_proto = IPPROTO_SCTP;
434         if (asoc) {
435                 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
436                 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
437                 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
438         }
439         if (saddr) {
440                 fl4->saddr = saddr->v4.sin_addr.s_addr;
441                 fl4->fl4_sport = saddr->v4.sin_port;
442         }
443 
444         pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
445                  &fl4->saddr);
446 
447         rt = ip_route_output_key(sock_net(sk), fl4);
448         if (!IS_ERR(rt))
449                 dst = &rt->dst;
450 
451         /* If there is no association or if a source address is passed, no
452          * more validation is required.
453          */
454         if (!asoc || saddr)
455                 goto out;
456 
457         bp = &asoc->base.bind_addr;
458 
459         if (dst) {
460                 /* Walk through the bind address list and look for a bind
461                  * address that matches the source address of the returned dst.
462                  */
463                 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
464                 rcu_read_lock();
465                 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
466                         if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
467                             (laddr->state != SCTP_ADDR_SRC &&
468                             !asoc->src_out_of_asoc_ok))
469                                 continue;
470                         if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
471                                 goto out_unlock;
472                 }
473                 rcu_read_unlock();
474 
475                 /* None of the bound addresses match the source address of the
476                  * dst. So release it.
477                  */
478                 dst_release(dst);
479                 dst = NULL;
480         }
481 
482         /* Walk through the bind address list and try to get a dst that
483          * matches a bind address as the source address.
484          */
485         rcu_read_lock();
486         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
487                 struct net_device *odev;
488 
489                 if (!laddr->valid)
490                         continue;
491                 if (laddr->state != SCTP_ADDR_SRC ||
492                     AF_INET != laddr->a.sa.sa_family)
493                         continue;
494 
495                 fl4->fl4_sport = laddr->a.v4.sin_port;
496                 flowi4_update_output(fl4,
497                                      asoc->base.sk->sk_bound_dev_if,
498                                      RT_CONN_FLAGS(asoc->base.sk),
499                                      daddr->v4.sin_addr.s_addr,
500                                      laddr->a.v4.sin_addr.s_addr);
501 
502                 rt = ip_route_output_key(sock_net(sk), fl4);
503                 if (IS_ERR(rt))
504                         continue;
505 
506                 /* Ensure the src address belongs to the output
507                  * interface.
508                  */
509                 odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr,
510                                      false);
511                 if (!odev || odev->ifindex != fl4->flowi4_oif) {
512                         if (!dst)
513                                 dst = &rt->dst;
514                         else
515                                 dst_release(&rt->dst);
516                         continue;
517                 }
518 
519                 dst_release(dst);
520                 dst = &rt->dst;
521                 break;
522         }
523 
524 out_unlock:
525         rcu_read_unlock();
526 out:
527         t->dst = dst;
528         if (dst)
529                 pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
530                          &fl4->daddr, &fl4->saddr);
531         else
532                 pr_debug("no route\n");
533 }
534 
535 /* For v4, the source address is cached in the route entry(dst). So no need
536  * to cache it separately and hence this is an empty routine.
537  */
538 static void sctp_v4_get_saddr(struct sctp_sock *sk,
539                               struct sctp_transport *t,
540                               struct flowi *fl)
541 {
542         union sctp_addr *saddr = &t->saddr;
543         struct rtable *rt = (struct rtable *)t->dst;
544 
545         if (rt) {
546                 saddr->v4.sin_family = AF_INET;
547                 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
548         }
549 }
550 
551 /* What interface did this skb arrive on? */
552 static int sctp_v4_skb_iif(const struct sk_buff *skb)
553 {
554         return inet_iif(skb);
555 }
556 
557 /* Was this packet marked by Explicit Congestion Notification? */
558 static int sctp_v4_is_ce(const struct sk_buff *skb)
559 {
560         return INET_ECN_is_ce(ip_hdr(skb)->tos);
561 }
562 
563 /* Create and initialize a new sk for the socket returned by accept(). */
564 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
565                                              struct sctp_association *asoc,
566                                              bool kern)
567 {
568         struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
569                         sk->sk_prot, kern);
570         struct inet_sock *newinet;
571 
572         if (!newsk)
573                 goto out;
574 
575         sock_init_data(NULL, newsk);
576 
577         sctp_copy_sock(newsk, sk, asoc);
578         sock_reset_flag(newsk, SOCK_ZAPPED);
579 
580         sctp_v4_copy_ip_options(sk, newsk);
581 
582         newinet = inet_sk(newsk);
583 
584         newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
585 
586         sk_refcnt_debug_inc(newsk);
587 
588         if (newsk->sk_prot->init(newsk)) {
589                 sk_common_release(newsk);
590                 newsk = NULL;
591         }
592 
593 out:
594         return newsk;
595 }
596 
597 static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
598 {
599         /* No address mapping for V4 sockets */
600         return sizeof(struct sockaddr_in);
601 }
602 
603 /* Dump the v4 addr to the seq file. */
604 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
605 {
606         seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
607 }
608 
609 static void sctp_v4_ecn_capable(struct sock *sk)
610 {
611         INET_ECN_xmit(sk);
612 }
613 
614 static void sctp_addr_wq_timeout_handler(struct timer_list *t)
615 {
616         struct net *net = from_timer(net, t, sctp.addr_wq_timer);
617         struct sctp_sockaddr_entry *addrw, *temp;
618         struct sctp_sock *sp;
619 
620         spin_lock_bh(&net->sctp.addr_wq_lock);
621 
622         list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
623                 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
624                          "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
625                          addrw->state, addrw);
626 
627 #if IS_ENABLED(CONFIG_IPV6)
628                 /* Now we send an ASCONF for each association */
629                 /* Note. we currently don't handle link local IPv6 addressees */
630                 if (addrw->a.sa.sa_family == AF_INET6) {
631                         struct in6_addr *in6;
632 
633                         if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
634                             IPV6_ADDR_LINKLOCAL)
635                                 goto free_next;
636 
637                         in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
638                         if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
639                             addrw->state == SCTP_ADDR_NEW) {
640                                 unsigned long timeo_val;
641 
642                                 pr_debug("%s: this is on DAD, trying %d sec "
643                                          "later\n", __func__,
644                                          SCTP_ADDRESS_TICK_DELAY);
645 
646                                 timeo_val = jiffies;
647                                 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
648                                 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
649                                 break;
650                         }
651                 }
652 #endif
653                 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
654                         struct sock *sk;
655 
656                         sk = sctp_opt2sk(sp);
657                         /* ignore bound-specific endpoints */
658                         if (!sctp_is_ep_boundall(sk))
659                                 continue;
660                         bh_lock_sock(sk);
661                         if (sctp_asconf_mgmt(sp, addrw) < 0)
662                                 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
663                         bh_unlock_sock(sk);
664                 }
665 #if IS_ENABLED(CONFIG_IPV6)
666 free_next:
667 #endif
668                 list_del(&addrw->list);
669                 kfree(addrw);
670         }
671         spin_unlock_bh(&net->sctp.addr_wq_lock);
672 }
673 
674 static void sctp_free_addr_wq(struct net *net)
675 {
676         struct sctp_sockaddr_entry *addrw;
677         struct sctp_sockaddr_entry *temp;
678 
679         spin_lock_bh(&net->sctp.addr_wq_lock);
680         del_timer(&net->sctp.addr_wq_timer);
681         list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
682                 list_del(&addrw->list);
683                 kfree(addrw);
684         }
685         spin_unlock_bh(&net->sctp.addr_wq_lock);
686 }
687 
688 /* lookup the entry for the same address in the addr_waitq
689  * sctp_addr_wq MUST be locked
690  */
691 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
692                                         struct sctp_sockaddr_entry *addr)
693 {
694         struct sctp_sockaddr_entry *addrw;
695 
696         list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
697                 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
698                         continue;
699                 if (addrw->a.sa.sa_family == AF_INET) {
700                         if (addrw->a.v4.sin_addr.s_addr ==
701                             addr->a.v4.sin_addr.s_addr)
702                                 return addrw;
703                 } else if (addrw->a.sa.sa_family == AF_INET6) {
704                         if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
705                             &addr->a.v6.sin6_addr))
706                                 return addrw;
707                 }
708         }
709         return NULL;
710 }
711 
712 void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
713 {
714         struct sctp_sockaddr_entry *addrw;
715         unsigned long timeo_val;
716 
717         /* first, we check if an opposite message already exist in the queue.
718          * If we found such message, it is removed.
719          * This operation is a bit stupid, but the DHCP client attaches the
720          * new address after a couple of addition and deletion of that address
721          */
722 
723         spin_lock_bh(&net->sctp.addr_wq_lock);
724         /* Offsets existing events in addr_wq */
725         addrw = sctp_addr_wq_lookup(net, addr);
726         if (addrw) {
727                 if (addrw->state != cmd) {
728                         pr_debug("%s: offsets existing entry for %d, addr:%pISc "
729                                  "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
730                                  &net->sctp.addr_waitq);
731 
732                         list_del(&addrw->list);
733                         kfree(addrw);
734                 }
735                 spin_unlock_bh(&net->sctp.addr_wq_lock);
736                 return;
737         }
738 
739         /* OK, we have to add the new address to the wait queue */
740         addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
741         if (addrw == NULL) {
742                 spin_unlock_bh(&net->sctp.addr_wq_lock);
743                 return;
744         }
745         addrw->state = cmd;
746         list_add_tail(&addrw->list, &net->sctp.addr_waitq);
747 
748         pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
749                  __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
750 
751         if (!timer_pending(&net->sctp.addr_wq_timer)) {
752                 timeo_val = jiffies;
753                 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
754                 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
755         }
756         spin_unlock_bh(&net->sctp.addr_wq_lock);
757 }
758 
759 /* Event handler for inet address addition/deletion events.
760  * The sctp_local_addr_list needs to be protocted by a spin lock since
761  * multiple notifiers (say IPv4 and IPv6) may be running at the same
762  * time and thus corrupt the list.
763  * The reader side is protected with RCU.
764  */
765 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
766                                void *ptr)
767 {
768         struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
769         struct sctp_sockaddr_entry *addr = NULL;
770         struct sctp_sockaddr_entry *temp;
771         struct net *net = dev_net(ifa->ifa_dev->dev);
772         int found = 0;
773 
774         switch (ev) {
775         case NETDEV_UP:
776                 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
777                 if (addr) {
778                         addr->a.v4.sin_family = AF_INET;
779                         addr->a.v4.sin_port = 0;
780                         addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
781                         addr->valid = 1;
782                         spin_lock_bh(&net->sctp.local_addr_lock);
783                         list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
784                         sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
785                         spin_unlock_bh(&net->sctp.local_addr_lock);
786                 }
787                 break;
788         case NETDEV_DOWN:
789                 spin_lock_bh(&net->sctp.local_addr_lock);
790                 list_for_each_entry_safe(addr, temp,
791                                         &net->sctp.local_addr_list, list) {
792                         if (addr->a.sa.sa_family == AF_INET &&
793                                         addr->a.v4.sin_addr.s_addr ==
794                                         ifa->ifa_local) {
795                                 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
796                                 found = 1;
797                                 addr->valid = 0;
798                                 list_del_rcu(&addr->list);
799                                 break;
800                         }
801                 }
802                 spin_unlock_bh(&net->sctp.local_addr_lock);
803                 if (found)
804                         kfree_rcu(addr, rcu);
805                 break;
806         }
807 
808         return NOTIFY_DONE;
809 }
810 
811 /*
812  * Initialize the control inode/socket with a control endpoint data
813  * structure.  This endpoint is reserved exclusively for the OOTB processing.
814  */
815 static int sctp_ctl_sock_init(struct net *net)
816 {
817         int err;
818         sa_family_t family = PF_INET;
819 
820         if (sctp_get_pf_specific(PF_INET6))
821                 family = PF_INET6;
822 
823         err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
824                                    SOCK_SEQPACKET, IPPROTO_SCTP, net);
825 
826         /* If IPv6 socket could not be created, try the IPv4 socket */
827         if (err < 0 && family == PF_INET6)
828                 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
829                                            SOCK_SEQPACKET, IPPROTO_SCTP,
830                                            net);
831 
832         if (err < 0) {
833                 pr_err("Failed to create the SCTP control socket\n");
834                 return err;
835         }
836         return 0;
837 }
838 
839 /* Register address family specific functions. */
840 int sctp_register_af(struct sctp_af *af)
841 {
842         switch (af->sa_family) {
843         case AF_INET:
844                 if (sctp_af_v4_specific)
845                         return 0;
846                 sctp_af_v4_specific = af;
847                 break;
848         case AF_INET6:
849                 if (sctp_af_v6_specific)
850                         return 0;
851                 sctp_af_v6_specific = af;
852                 break;
853         default:
854                 return 0;
855         }
856 
857         INIT_LIST_HEAD(&af->list);
858         list_add_tail(&af->list, &sctp_address_families);
859         return 1;
860 }
861 
862 /* Get the table of functions for manipulating a particular address
863  * family.
864  */
865 struct sctp_af *sctp_get_af_specific(sa_family_t family)
866 {
867         switch (family) {
868         case AF_INET:
869                 return sctp_af_v4_specific;
870         case AF_INET6:
871                 return sctp_af_v6_specific;
872         default:
873                 return NULL;
874         }
875 }
876 
877 /* Common code to initialize a AF_INET msg_name. */
878 static void sctp_inet_msgname(char *msgname, int *addr_len)
879 {
880         struct sockaddr_in *sin;
881 
882         sin = (struct sockaddr_in *)msgname;
883         *addr_len = sizeof(struct sockaddr_in);
884         sin->sin_family = AF_INET;
885         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
886 }
887 
888 /* Copy the primary address of the peer primary address as the msg_name. */
889 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
890                                     int *addr_len)
891 {
892         struct sockaddr_in *sin, *sinfrom;
893 
894         if (msgname) {
895                 struct sctp_association *asoc;
896 
897                 asoc = event->asoc;
898                 sctp_inet_msgname(msgname, addr_len);
899                 sin = (struct sockaddr_in *)msgname;
900                 sinfrom = &asoc->peer.primary_addr.v4;
901                 sin->sin_port = htons(asoc->peer.port);
902                 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
903         }
904 }
905 
906 /* Initialize and copy out a msgname from an inbound skb. */
907 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
908 {
909         if (msgname) {
910                 struct sctphdr *sh = sctp_hdr(skb);
911                 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
912 
913                 sctp_inet_msgname(msgname, len);
914                 sin->sin_port = sh->source;
915                 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
916         }
917 }
918 
919 /* Do we support this AF? */
920 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
921 {
922         /* PF_INET only supports AF_INET addresses. */
923         return AF_INET == family;
924 }
925 
926 /* Address matching with wildcards allowed. */
927 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
928                               const union sctp_addr *addr2,
929                               struct sctp_sock *opt)
930 {
931         /* PF_INET only supports AF_INET addresses. */
932         if (addr1->sa.sa_family != addr2->sa.sa_family)
933                 return 0;
934         if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
935             htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
936                 return 1;
937         if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
938                 return 1;
939 
940         return 0;
941 }
942 
943 /* Verify that provided sockaddr looks bindable.  Common verification has
944  * already been taken care of.
945  */
946 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
947 {
948         return sctp_v4_available(addr, opt);
949 }
950 
951 /* Verify that sockaddr looks sendable.  Common verification has already
952  * been taken care of.
953  */
954 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
955 {
956         return 1;
957 }
958 
959 /* Fill in Supported Address Type information for INIT and INIT-ACK
960  * chunks.  Returns number of addresses supported.
961  */
962 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
963                                      __be16 *types)
964 {
965         types[0] = SCTP_PARAM_IPV4_ADDRESS;
966         return 1;
967 }
968 
969 /* Wrapper routine that calls the ip transmit routine. */
970 static inline int sctp_v4_xmit(struct sk_buff *skb,
971                                struct sctp_transport *transport)
972 {
973         struct inet_sock *inet = inet_sk(skb->sk);
974 
975         pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
976                  skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr);
977 
978         inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
979                          IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
980 
981         SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
982 
983         return ip_queue_xmit(&inet->sk, skb, &transport->fl);
984 }
985 
986 static struct sctp_af sctp_af_inet;
987 
988 static struct sctp_pf sctp_pf_inet = {
989         .event_msgname = sctp_inet_event_msgname,
990         .skb_msgname   = sctp_inet_skb_msgname,
991         .af_supported  = sctp_inet_af_supported,
992         .cmp_addr      = sctp_inet_cmp_addr,
993         .bind_verify   = sctp_inet_bind_verify,
994         .send_verify   = sctp_inet_send_verify,
995         .supported_addrs = sctp_inet_supported_addrs,
996         .create_accept_sk = sctp_v4_create_accept_sk,
997         .addr_to_user  = sctp_v4_addr_to_user,
998         .to_sk_saddr   = sctp_v4_to_sk_saddr,
999         .to_sk_daddr   = sctp_v4_to_sk_daddr,
1000         .copy_ip_options = sctp_v4_copy_ip_options,
1001         .af            = &sctp_af_inet
1002 };
1003 
1004 /* Notifier for inetaddr addition/deletion events.  */
1005 static struct notifier_block sctp_inetaddr_notifier = {
1006         .notifier_call = sctp_inetaddr_event,
1007 };
1008 
1009 /* Socket operations.  */
1010 static const struct proto_ops inet_seqpacket_ops = {
1011         .family            = PF_INET,
1012         .owner             = THIS_MODULE,
1013         .release           = inet_release,      /* Needs to be wrapped... */
1014         .bind              = inet_bind,
1015         .connect           = sctp_inet_connect,
1016         .socketpair        = sock_no_socketpair,
1017         .accept            = inet_accept,
1018         .getname           = inet_getname,      /* Semantics are different.  */
1019         .poll              = sctp_poll,
1020         .ioctl             = inet_ioctl,
1021         .listen            = sctp_inet_listen,
1022         .shutdown          = inet_shutdown,     /* Looks harmless.  */
1023         .setsockopt        = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1024         .getsockopt        = sock_common_getsockopt,
1025         .sendmsg           = inet_sendmsg,
1026         .recvmsg           = inet_recvmsg,
1027         .mmap              = sock_no_mmap,
1028         .sendpage          = sock_no_sendpage,
1029 #ifdef CONFIG_COMPAT
1030         .compat_setsockopt = compat_sock_common_setsockopt,
1031         .compat_getsockopt = compat_sock_common_getsockopt,
1032 #endif
1033 };
1034 
1035 /* Registration with AF_INET family.  */
1036 static struct inet_protosw sctp_seqpacket_protosw = {
1037         .type       = SOCK_SEQPACKET,
1038         .protocol   = IPPROTO_SCTP,
1039         .prot       = &sctp_prot,
1040         .ops        = &inet_seqpacket_ops,
1041         .flags      = SCTP_PROTOSW_FLAG
1042 };
1043 static struct inet_protosw sctp_stream_protosw = {
1044         .type       = SOCK_STREAM,
1045         .protocol   = IPPROTO_SCTP,
1046         .prot       = &sctp_prot,
1047         .ops        = &inet_seqpacket_ops,
1048         .flags      = SCTP_PROTOSW_FLAG
1049 };
1050 
1051 /* Register with IP layer.  */
1052 static const struct net_protocol sctp_protocol = {
1053         .handler     = sctp_rcv,
1054         .err_handler = sctp_v4_err,
1055         .no_policy   = 1,
1056         .netns_ok    = 1,
1057         .icmp_strict_tag_validation = 1,
1058 };
1059 
1060 /* IPv4 address related functions.  */
1061 static struct sctp_af sctp_af_inet = {
1062         .sa_family         = AF_INET,
1063         .sctp_xmit         = sctp_v4_xmit,
1064         .setsockopt        = ip_setsockopt,
1065         .getsockopt        = ip_getsockopt,
1066         .get_dst           = sctp_v4_get_dst,
1067         .get_saddr         = sctp_v4_get_saddr,
1068         .copy_addrlist     = sctp_v4_copy_addrlist,
1069         .from_skb          = sctp_v4_from_skb,
1070         .from_sk           = sctp_v4_from_sk,
1071         .from_addr_param   = sctp_v4_from_addr_param,
1072         .to_addr_param     = sctp_v4_to_addr_param,
1073         .cmp_addr          = sctp_v4_cmp_addr,
1074         .addr_valid        = sctp_v4_addr_valid,
1075         .inaddr_any        = sctp_v4_inaddr_any,
1076         .is_any            = sctp_v4_is_any,
1077         .available         = sctp_v4_available,
1078         .scope             = sctp_v4_scope,
1079         .skb_iif           = sctp_v4_skb_iif,
1080         .is_ce             = sctp_v4_is_ce,
1081         .seq_dump_addr     = sctp_v4_seq_dump_addr,
1082         .ecn_capable       = sctp_v4_ecn_capable,
1083         .net_header_len    = sizeof(struct iphdr),
1084         .sockaddr_len      = sizeof(struct sockaddr_in),
1085         .ip_options_len    = sctp_v4_ip_options_len,
1086 #ifdef CONFIG_COMPAT
1087         .compat_setsockopt = compat_ip_setsockopt,
1088         .compat_getsockopt = compat_ip_getsockopt,
1089 #endif
1090 };
1091 
1092 struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
1093 {
1094         switch (family) {
1095         case PF_INET:
1096                 return sctp_pf_inet_specific;
1097         case PF_INET6:
1098                 return sctp_pf_inet6_specific;
1099         default:
1100                 return NULL;
1101         }
1102 }
1103 
1104 /* Register the PF specific function table.  */
1105 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1106 {
1107         switch (family) {
1108         case PF_INET:
1109                 if (sctp_pf_inet_specific)
1110                         return 0;
1111                 sctp_pf_inet_specific = pf;
1112                 break;
1113         case PF_INET6:
1114                 if (sctp_pf_inet6_specific)
1115                         return 0;
1116                 sctp_pf_inet6_specific = pf;
1117                 break;
1118         default:
1119                 return 0;
1120         }
1121         return 1;
1122 }
1123 
1124 static inline int init_sctp_mibs(struct net *net)
1125 {
1126         net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib);
1127         if (!net->sctp.sctp_statistics)
1128                 return -ENOMEM;
1129         return 0;
1130 }
1131 
1132 static inline void cleanup_sctp_mibs(struct net *net)
1133 {
1134         free_percpu(net->sctp.sctp_statistics);
1135 }
1136 
1137 static void sctp_v4_pf_init(void)
1138 {
1139         /* Initialize the SCTP specific PF functions. */
1140         sctp_register_pf(&sctp_pf_inet, PF_INET);
1141         sctp_register_af(&sctp_af_inet);
1142 }
1143 
1144 static void sctp_v4_pf_exit(void)
1145 {
1146         list_del(&sctp_af_inet.list);
1147 }
1148 
1149 static int sctp_v4_protosw_init(void)
1150 {
1151         int rc;
1152 
1153         rc = proto_register(&sctp_prot, 1);
1154         if (rc)
1155                 return rc;
1156 
1157         /* Register SCTP(UDP and TCP style) with socket layer.  */
1158         inet_register_protosw(&sctp_seqpacket_protosw);
1159         inet_register_protosw(&sctp_stream_protosw);
1160 
1161         return 0;
1162 }
1163 
1164 static void sctp_v4_protosw_exit(void)
1165 {
1166         inet_unregister_protosw(&sctp_stream_protosw);
1167         inet_unregister_protosw(&sctp_seqpacket_protosw);
1168         proto_unregister(&sctp_prot);
1169 }
1170 
1171 static int sctp_v4_add_protocol(void)
1172 {
1173         /* Register notifier for inet address additions/deletions. */
1174         register_inetaddr_notifier(&sctp_inetaddr_notifier);
1175 
1176         /* Register SCTP with inet layer.  */
1177         if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1178                 return -EAGAIN;
1179 
1180         return 0;
1181 }
1182 
1183 static void sctp_v4_del_protocol(void)
1184 {
1185         inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1186         unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1187 }
1188 
1189 static int __net_init sctp_defaults_init(struct net *net)
1190 {
1191         int status;
1192 
1193         /*
1194          * 14. Suggested SCTP Protocol Parameter Values
1195          */
1196         /* The following protocol parameters are RECOMMENDED:  */
1197         /* RTO.Initial              - 3  seconds */
1198         net->sctp.rto_initial                   = SCTP_RTO_INITIAL;
1199         /* RTO.Min                  - 1  second */
1200         net->sctp.rto_min                       = SCTP_RTO_MIN;
1201         /* RTO.Max                 -  60 seconds */
1202         net->sctp.rto_max                       = SCTP_RTO_MAX;
1203         /* RTO.Alpha                - 1/8 */
1204         net->sctp.rto_alpha                     = SCTP_RTO_ALPHA;
1205         /* RTO.Beta                 - 1/4 */
1206         net->sctp.rto_beta                      = SCTP_RTO_BETA;
1207 
1208         /* Valid.Cookie.Life        - 60  seconds */
1209         net->sctp.valid_cookie_life             = SCTP_DEFAULT_COOKIE_LIFE;
1210 
1211         /* Whether Cookie Preservative is enabled(1) or not(0) */
1212         net->sctp.cookie_preserve_enable        = 1;
1213 
1214         /* Default sctp sockets to use md5 as their hmac alg */
1215 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1216         net->sctp.sctp_hmac_alg                 = "md5";
1217 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1218         net->sctp.sctp_hmac_alg                 = "sha1";
1219 #else
1220         net->sctp.sctp_hmac_alg                 = NULL;
1221 #endif
1222 
1223         /* Max.Burst                - 4 */
1224         net->sctp.max_burst                     = SCTP_DEFAULT_MAX_BURST;
1225 
1226         /* Enable pf state by default */
1227         net->sctp.pf_enable = 1;
1228 
1229         /* Association.Max.Retrans  - 10 attempts
1230          * Path.Max.Retrans         - 5  attempts (per destination address)
1231          * Max.Init.Retransmits     - 8  attempts
1232          */
1233         net->sctp.max_retrans_association       = 10;
1234         net->sctp.max_retrans_path              = 5;
1235         net->sctp.max_retrans_init              = 8;
1236 
1237         /* Sendbuffer growth        - do per-socket accounting */
1238         net->sctp.sndbuf_policy                 = 0;
1239 
1240         /* Rcvbuffer growth         - do per-socket accounting */
1241         net->sctp.rcvbuf_policy                 = 0;
1242 
1243         /* HB.interval              - 30 seconds */
1244         net->sctp.hb_interval                   = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1245 
1246         /* delayed SACK timeout */
1247         net->sctp.sack_timeout                  = SCTP_DEFAULT_TIMEOUT_SACK;
1248 
1249         /* Disable ADDIP by default. */
1250         net->sctp.addip_enable = 0;
1251         net->sctp.addip_noauth = 0;
1252         net->sctp.default_auto_asconf = 0;
1253 
1254         /* Enable PR-SCTP by default. */
1255         net->sctp.prsctp_enable = 1;
1256 
1257         /* Disable RECONF by default. */
1258         net->sctp.reconf_enable = 0;
1259 
1260         /* Disable AUTH by default. */
1261         net->sctp.auth_enable = 0;
1262 
1263         /* Set SCOPE policy to enabled */
1264         net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1265 
1266         /* Set the default rwnd update threshold */
1267         net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1268 
1269         /* Initialize maximum autoclose timeout. */
1270         net->sctp.max_autoclose         = INT_MAX / HZ;
1271 
1272         status = sctp_sysctl_net_register(net);
1273         if (status)
1274                 goto err_sysctl_register;
1275 
1276         /* Allocate and initialise sctp mibs.  */
1277         status = init_sctp_mibs(net);
1278         if (status)
1279                 goto err_init_mibs;
1280 
1281 #ifdef CONFIG_PROC_FS
1282         /* Initialize proc fs directory.  */
1283         status = sctp_proc_init(net);
1284         if (status)
1285                 goto err_init_proc;
1286 #endif
1287 
1288         sctp_dbg_objcnt_init(net);
1289 
1290         /* Initialize the local address list. */
1291         INIT_LIST_HEAD(&net->sctp.local_addr_list);
1292         spin_lock_init(&net->sctp.local_addr_lock);
1293         sctp_get_local_addr_list(net);
1294 
1295         /* Initialize the address event list */
1296         INIT_LIST_HEAD(&net->sctp.addr_waitq);
1297         INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1298         spin_lock_init(&net->sctp.addr_wq_lock);
1299         net->sctp.addr_wq_timer.expires = 0;
1300         timer_setup(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler, 0);
1301 
1302         return 0;
1303 
1304 #ifdef CONFIG_PROC_FS
1305 err_init_proc:
1306         cleanup_sctp_mibs(net);
1307 #endif
1308 err_init_mibs:
1309         sctp_sysctl_net_unregister(net);
1310 err_sysctl_register:
1311         return status;
1312 }
1313 
1314 static void __net_exit sctp_defaults_exit(struct net *net)
1315 {
1316         /* Free the local address list */
1317         sctp_free_addr_wq(net);
1318         sctp_free_local_addr_list(net);
1319 
1320 #ifdef CONFIG_PROC_FS
1321         remove_proc_subtree("sctp", net->proc_net);
1322         net->sctp.proc_net_sctp = NULL;
1323 #endif
1324         cleanup_sctp_mibs(net);
1325         sctp_sysctl_net_unregister(net);
1326 }
1327 
1328 static struct pernet_operations sctp_defaults_ops = {
1329         .init = sctp_defaults_init,
1330         .exit = sctp_defaults_exit,
1331 };
1332 
1333 static int __net_init sctp_ctrlsock_init(struct net *net)
1334 {
1335         int status;
1336 
1337         /* Initialize the control inode/socket for handling OOTB packets.  */
1338         status = sctp_ctl_sock_init(net);
1339         if (status)
1340                 pr_err("Failed to initialize the SCTP control sock\n");
1341 
1342         return status;
1343 }
1344 
1345 static void __net_init sctp_ctrlsock_exit(struct net *net)
1346 {
1347         /* Free the control endpoint.  */
1348         inet_ctl_sock_destroy(net->sctp.ctl_sock);
1349 }
1350 
1351 static struct pernet_operations sctp_ctrlsock_ops = {
1352         .init = sctp_ctrlsock_init,
1353         .exit = sctp_ctrlsock_exit,
1354 };
1355 
1356 /* Initialize the universe into something sensible.  */
1357 static __init int sctp_init(void)
1358 {
1359         int i;
1360         int status = -EINVAL;
1361         unsigned long goal;
1362         unsigned long limit;
1363         int max_share;
1364         int order;
1365         int num_entries;
1366         int max_entry_order;
1367 
1368         sock_skb_cb_check_size(sizeof(struct sctp_ulpevent));
1369 
1370         /* Allocate bind_bucket and chunk caches. */
1371         status = -ENOBUFS;
1372         sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1373                                                sizeof(struct sctp_bind_bucket),
1374                                                0, SLAB_HWCACHE_ALIGN,
1375                                                NULL);
1376         if (!sctp_bucket_cachep)
1377                 goto out;
1378 
1379         sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1380                                                sizeof(struct sctp_chunk),
1381                                                0, SLAB_HWCACHE_ALIGN,
1382                                                NULL);
1383         if (!sctp_chunk_cachep)
1384                 goto err_chunk_cachep;
1385 
1386         status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL);
1387         if (status)
1388                 goto err_percpu_counter_init;
1389 
1390         /* Implementation specific variables. */
1391 
1392         /* Initialize default stream count setup information. */
1393         sctp_max_instreams              = SCTP_DEFAULT_INSTREAMS;
1394         sctp_max_outstreams             = SCTP_DEFAULT_OUTSTREAMS;
1395 
1396         /* Initialize handle used for association ids. */
1397         idr_init(&sctp_assocs_id);
1398 
1399         limit = nr_free_buffer_pages() / 8;
1400         limit = max(limit, 128UL);
1401         sysctl_sctp_mem[0] = limit / 4 * 3;
1402         sysctl_sctp_mem[1] = limit;
1403         sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1404 
1405         /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1406         limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1407         max_share = min(4UL*1024*1024, limit);
1408 
1409         sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1410         sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1411         sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1412 
1413         sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1414         sysctl_sctp_wmem[1] = 16*1024;
1415         sysctl_sctp_wmem[2] = max(64*1024, max_share);
1416 
1417         /* Size and allocate the association hash table.
1418          * The methodology is similar to that of the tcp hash tables.
1419          * Though not identical.  Start by getting a goal size
1420          */
1421         if (totalram_pages >= (128 * 1024))
1422                 goal = totalram_pages >> (22 - PAGE_SHIFT);
1423         else
1424                 goal = totalram_pages >> (24 - PAGE_SHIFT);
1425 
1426         /* Then compute the page order for said goal */
1427         order = get_order(goal);
1428 
1429         /* Now compute the required page order for the maximum sized table we
1430          * want to create
1431          */
1432         max_entry_order = get_order(MAX_SCTP_PORT_HASH_ENTRIES *
1433                                     sizeof(struct sctp_bind_hashbucket));
1434 
1435         /* Limit the page order by that maximum hash table size */
1436         order = min(order, max_entry_order);
1437 
1438         /* Allocate and initialize the endpoint hash table.  */
1439         sctp_ep_hashsize = 64;
1440         sctp_ep_hashtable =
1441                 kmalloc_array(64, sizeof(struct sctp_hashbucket), GFP_KERNEL);
1442         if (!sctp_ep_hashtable) {
1443                 pr_err("Failed endpoint_hash alloc\n");
1444                 status = -ENOMEM;
1445                 goto err_ehash_alloc;
1446         }
1447         for (i = 0; i < sctp_ep_hashsize; i++) {
1448                 rwlock_init(&sctp_ep_hashtable[i].lock);
1449                 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1450         }
1451 
1452         /* Allocate and initialize the SCTP port hash table.
1453          * Note that order is initalized to start at the max sized
1454          * table we want to support.  If we can't get that many pages
1455          * reduce the order and try again
1456          */
1457         do {
1458                 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1459                         __get_free_pages(GFP_KERNEL | __GFP_NOWARN, order);
1460         } while (!sctp_port_hashtable && --order > 0);
1461 
1462         if (!sctp_port_hashtable) {
1463                 pr_err("Failed bind hash alloc\n");
1464                 status = -ENOMEM;
1465                 goto err_bhash_alloc;
1466         }
1467 
1468         /* Now compute the number of entries that will fit in the
1469          * port hash space we allocated
1470          */
1471         num_entries = (1UL << order) * PAGE_SIZE /
1472                       sizeof(struct sctp_bind_hashbucket);
1473 
1474         /* And finish by rounding it down to the nearest power of two
1475          * this wastes some memory of course, but its needed because
1476          * the hash function operates based on the assumption that
1477          * that the number of entries is a power of two
1478          */
1479         sctp_port_hashsize = rounddown_pow_of_two(num_entries);
1480 
1481         for (i = 0; i < sctp_port_hashsize; i++) {
1482                 spin_lock_init(&sctp_port_hashtable[i].lock);
1483                 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1484         }
1485 
1486         status = sctp_transport_hashtable_init();
1487         if (status)
1488                 goto err_thash_alloc;
1489 
1490         pr_info("Hash tables configured (bind %d/%d)\n", sctp_port_hashsize,
1491                 num_entries);
1492 
1493         sctp_sysctl_register();
1494 
1495         INIT_LIST_HEAD(&sctp_address_families);
1496         sctp_v4_pf_init();
1497         sctp_v6_pf_init();
1498         sctp_sched_ops_init();
1499 
1500         status = register_pernet_subsys(&sctp_defaults_ops);
1501         if (status)
1502                 goto err_register_defaults;
1503 
1504         status = sctp_v4_protosw_init();
1505         if (status)
1506                 goto err_protosw_init;
1507 
1508         status = sctp_v6_protosw_init();
1509         if (status)
1510                 goto err_v6_protosw_init;
1511 
1512         status = register_pernet_subsys(&sctp_ctrlsock_ops);
1513         if (status)
1514                 goto err_register_ctrlsock;
1515 
1516         status = sctp_v4_add_protocol();
1517         if (status)
1518                 goto err_add_protocol;
1519 
1520         /* Register SCTP with inet6 layer.  */
1521         status = sctp_v6_add_protocol();
1522         if (status)
1523                 goto err_v6_add_protocol;
1524 
1525         if (sctp_offload_init() < 0)
1526                 pr_crit("%s: Cannot add SCTP protocol offload\n", __func__);
1527 
1528 out:
1529         return status;
1530 err_v6_add_protocol:
1531         sctp_v4_del_protocol();
1532 err_add_protocol:
1533         unregister_pernet_subsys(&sctp_ctrlsock_ops);
1534 err_register_ctrlsock:
1535         sctp_v6_protosw_exit();
1536 err_v6_protosw_init:
1537         sctp_v4_protosw_exit();
1538 err_protosw_init:
1539         unregister_pernet_subsys(&sctp_defaults_ops);
1540 err_register_defaults:
1541         sctp_v4_pf_exit();
1542         sctp_v6_pf_exit();
1543         sctp_sysctl_unregister();
1544         free_pages((unsigned long)sctp_port_hashtable,
1545                    get_order(sctp_port_hashsize *
1546                              sizeof(struct sctp_bind_hashbucket)));
1547 err_bhash_alloc:
1548         sctp_transport_hashtable_destroy();
1549 err_thash_alloc:
1550         kfree(sctp_ep_hashtable);
1551 err_ehash_alloc:
1552         percpu_counter_destroy(&sctp_sockets_allocated);
1553 err_percpu_counter_init:
1554         kmem_cache_destroy(sctp_chunk_cachep);
1555 err_chunk_cachep:
1556         kmem_cache_destroy(sctp_bucket_cachep);
1557         goto out;
1558 }
1559 
1560 /* Exit handler for the SCTP protocol.  */
1561 static __exit void sctp_exit(void)
1562 {
1563         /* BUG.  This should probably do something useful like clean
1564          * up all the remaining associations and all that memory.
1565          */
1566 
1567         /* Unregister with inet6/inet layers. */
1568         sctp_v6_del_protocol();
1569         sctp_v4_del_protocol();
1570 
1571         unregister_pernet_subsys(&sctp_ctrlsock_ops);
1572 
1573         /* Free protosw registrations */
1574         sctp_v6_protosw_exit();
1575         sctp_v4_protosw_exit();
1576 
1577         unregister_pernet_subsys(&sctp_defaults_ops);
1578 
1579         /* Unregister with socket layer. */
1580         sctp_v6_pf_exit();
1581         sctp_v4_pf_exit();
1582 
1583         sctp_sysctl_unregister();
1584 
1585         free_pages((unsigned long)sctp_port_hashtable,
1586                    get_order(sctp_port_hashsize *
1587                              sizeof(struct sctp_bind_hashbucket)));
1588         kfree(sctp_ep_hashtable);
1589         sctp_transport_hashtable_destroy();
1590 
1591         percpu_counter_destroy(&sctp_sockets_allocated);
1592 
1593         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1594 
1595         kmem_cache_destroy(sctp_chunk_cachep);
1596         kmem_cache_destroy(sctp_bucket_cachep);
1597 }
1598 
1599 module_init(sctp_init);
1600 module_exit(sctp_exit);
1601 
1602 /*
1603  * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1604  */
1605 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1606 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1607 MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
1608 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1609 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1610 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1611 MODULE_LICENSE("GPL");
1612 

~ [ 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