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1/* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2002, 2004
3 * Copyright (c) 2001 Nokia, Inc.
4 * Copyright (c) 2001 La Monte H.P. Yarroll
5 * Copyright (c) 2002-2003 Intel Corp.
6 *
7 * This file is part of the SCTP kernel implementation
8 *
9 * SCTP over IPv6.
10 *
11 * This SCTP implementation is free software;
12 * you can redistribute it and/or modify it under the terms of
13 * the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
17 * This SCTP implementation is distributed in the hope that it
18 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
19 * ************************
20 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
21 * See the GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with GNU CC; see the file COPYING. If not, see
25 * <http://www.gnu.org/licenses/>.
26 *
27 * Please send any bug reports or fixes you make to the
28 * email address(es):
29 * lksctp developers <linux-sctp@vger.kernel.org>
30 *
31 * Written or modified by:
32 * Le Yanqun <yanqun.le@nokia.com>
33 * Hui Huang <hui.huang@nokia.com>
34 * La Monte H.P. Yarroll <piggy@acm.org>
35 * Sridhar Samudrala <sri@us.ibm.com>
36 * Jon Grimm <jgrimm@us.ibm.com>
37 * Ardelle Fan <ardelle.fan@intel.com>
38 *
39 * Based on:
40 * linux/net/ipv6/tcp_ipv6.c
41 */
42
43#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
44
45#include <linux/module.h>
46#include <linux/errno.h>
47#include <linux/types.h>
48#include <linux/socket.h>
49#include <linux/sockios.h>
50#include <linux/net.h>
51#include <linux/in.h>
52#include <linux/in6.h>
53#include <linux/netdevice.h>
54#include <linux/init.h>
55#include <linux/ipsec.h>
56#include <linux/slab.h>
57
58#include <linux/ipv6.h>
59#include <linux/icmpv6.h>
60#include <linux/random.h>
61#include <linux/seq_file.h>
62
63#include <net/protocol.h>
64#include <net/ndisc.h>
65#include <net/ip.h>
66#include <net/ipv6.h>
67#include <net/transp_v6.h>
68#include <net/addrconf.h>
69#include <net/ip6_route.h>
70#include <net/inet_common.h>
71#include <net/inet_ecn.h>
72#include <net/sctp/sctp.h>
73
74#include <asm/uaccess.h>
75
76static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
77 union sctp_addr *s2);
78static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
79 __be16 port);
80static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
81 const union sctp_addr *addr2);
82
83/* Event handler for inet6 address addition/deletion events.
84 * The sctp_local_addr_list needs to be protocted by a spin lock since
85 * multiple notifiers (say IPv4 and IPv6) may be running at the same
86 * time and thus corrupt the list.
87 * The reader side is protected with RCU.
88 */
89static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
90 void *ptr)
91{
92 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
93 struct sctp_sockaddr_entry *addr = NULL;
94 struct sctp_sockaddr_entry *temp;
95 struct net *net = dev_net(ifa->idev->dev);
96 int found = 0;
97
98 switch (ev) {
99 case NETDEV_UP:
100 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
101 if (addr) {
102 addr->a.v6.sin6_family = AF_INET6;
103 addr->a.v6.sin6_port = 0;
104 addr->a.v6.sin6_addr = ifa->addr;
105 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
106 addr->valid = 1;
107 spin_lock_bh(&net->sctp.local_addr_lock);
108 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
109 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
110 spin_unlock_bh(&net->sctp.local_addr_lock);
111 }
112 break;
113 case NETDEV_DOWN:
114 spin_lock_bh(&net->sctp.local_addr_lock);
115 list_for_each_entry_safe(addr, temp,
116 &net->sctp.local_addr_list, list) {
117 if (addr->a.sa.sa_family == AF_INET6 &&
118 ipv6_addr_equal(&addr->a.v6.sin6_addr,
119 &ifa->addr)) {
120 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
121 found = 1;
122 addr->valid = 0;
123 list_del_rcu(&addr->list);
124 break;
125 }
126 }
127 spin_unlock_bh(&net->sctp.local_addr_lock);
128 if (found)
129 kfree_rcu(addr, rcu);
130 break;
131 }
132
133 return NOTIFY_DONE;
134}
135
136static struct notifier_block sctp_inet6addr_notifier = {
137 .notifier_call = sctp_inet6addr_event,
138};
139
140/* ICMP error handler. */
141static void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
142 u8 type, u8 code, int offset, __be32 info)
143{
144 struct inet6_dev *idev;
145 struct sock *sk;
146 struct sctp_association *asoc;
147 struct sctp_transport *transport;
148 struct ipv6_pinfo *np;
149 __u16 saveip, savesctp;
150 int err;
151 struct net *net = dev_net(skb->dev);
152
153 idev = in6_dev_get(skb->dev);
154
155 /* Fix up skb to look at the embedded net header. */
156 saveip = skb->network_header;
157 savesctp = skb->transport_header;
158 skb_reset_network_header(skb);
159 skb_set_transport_header(skb, offset);
160 sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
161 /* Put back, the original pointers. */
162 skb->network_header = saveip;
163 skb->transport_header = savesctp;
164 if (!sk) {
165 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_INERRORS);
166 goto out;
167 }
168
169 /* Warning: The sock lock is held. Remember to call
170 * sctp_err_finish!
171 */
172
173 switch (type) {
174 case ICMPV6_PKT_TOOBIG:
175 if (ip6_sk_accept_pmtu(sk))
176 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
177 goto out_unlock;
178 case ICMPV6_PARAMPROB:
179 if (ICMPV6_UNK_NEXTHDR == code) {
180 sctp_icmp_proto_unreachable(sk, asoc, transport);
181 goto out_unlock;
182 }
183 break;
184 case NDISC_REDIRECT:
185 sctp_icmp_redirect(sk, transport, skb);
186 goto out_unlock;
187 default:
188 break;
189 }
190
191 np = inet6_sk(sk);
192 icmpv6_err_convert(type, code, &err);
193 if (!sock_owned_by_user(sk) && np->recverr) {
194 sk->sk_err = err;
195 sk->sk_error_report(sk);
196 } else { /* Only an error on timeout */
197 sk->sk_err_soft = err;
198 }
199
200out_unlock:
201 sctp_err_finish(sk, asoc);
202out:
203 if (likely(idev != NULL))
204 in6_dev_put(idev);
205}
206
207static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
208{
209 struct sock *sk = skb->sk;
210 struct ipv6_pinfo *np = inet6_sk(sk);
211 struct flowi6 *fl6 = &transport->fl.u.ip6;
212
213 pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb,
214 skb->len, &fl6->saddr, &fl6->daddr);
215
216 IP6_ECN_flow_xmit(sk, fl6->flowlabel);
217
218 if (!(transport->param_flags & SPP_PMTUD_ENABLE))
219 skb->local_df = 1;
220
221 SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
222
223 return ip6_xmit(sk, skb, fl6, np->opt, np->tclass);
224}
225
226/* Returns the dst cache entry for the given source and destination ip
227 * addresses.
228 */
229static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
230 struct flowi *fl, struct sock *sk)
231{
232 struct sctp_association *asoc = t->asoc;
233 struct dst_entry *dst = NULL;
234 struct flowi6 *fl6 = &fl->u.ip6;
235 struct sctp_bind_addr *bp;
236 struct ipv6_pinfo *np = inet6_sk(sk);
237 struct sctp_sockaddr_entry *laddr;
238 union sctp_addr *baddr = NULL;
239 union sctp_addr *daddr = &t->ipaddr;
240 union sctp_addr dst_saddr;
241 struct in6_addr *final_p, final;
242 __u8 matchlen = 0;
243 __u8 bmatchlen;
244 sctp_scope_t scope;
245
246 memset(fl6, 0, sizeof(struct flowi6));
247 fl6->daddr = daddr->v6.sin6_addr;
248 fl6->fl6_dport = daddr->v6.sin6_port;
249 fl6->flowi6_proto = IPPROTO_SCTP;
250 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
251 fl6->flowi6_oif = daddr->v6.sin6_scope_id;
252
253 pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr);
254
255 if (asoc)
256 fl6->fl6_sport = htons(asoc->base.bind_addr.port);
257
258 if (saddr) {
259 fl6->saddr = saddr->v6.sin6_addr;
260 fl6->fl6_sport = saddr->v6.sin6_port;
261
262 pr_debug("src=%pI6 - ", &fl6->saddr);
263 }
264
265 final_p = fl6_update_dst(fl6, np->opt, &final);
266 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
267 if (!asoc || saddr)
268 goto out;
269
270 bp = &asoc->base.bind_addr;
271 scope = sctp_scope(daddr);
272 /* ip6_dst_lookup has filled in the fl6->saddr for us. Check
273 * to see if we can use it.
274 */
275 if (!IS_ERR(dst)) {
276 /* Walk through the bind address list and look for a bind
277 * address that matches the source address of the returned dst.
278 */
279 sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
280 rcu_read_lock();
281 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
282 if (!laddr->valid || laddr->state == SCTP_ADDR_DEL ||
283 (laddr->state != SCTP_ADDR_SRC &&
284 !asoc->src_out_of_asoc_ok))
285 continue;
286
287 /* Do not compare against v4 addrs */
288 if ((laddr->a.sa.sa_family == AF_INET6) &&
289 (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
290 rcu_read_unlock();
291 goto out;
292 }
293 }
294 rcu_read_unlock();
295 /* None of the bound addresses match the source address of the
296 * dst. So release it.
297 */
298 dst_release(dst);
299 dst = NULL;
300 }
301
302 /* Walk through the bind address list and try to get the
303 * best source address for a given destination.
304 */
305 rcu_read_lock();
306 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
307 if (!laddr->valid)
308 continue;
309 if ((laddr->state == SCTP_ADDR_SRC) &&
310 (laddr->a.sa.sa_family == AF_INET6) &&
311 (scope <= sctp_scope(&laddr->a))) {
312 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
313 if (!baddr || (matchlen < bmatchlen)) {
314 baddr = &laddr->a;
315 matchlen = bmatchlen;
316 }
317 }
318 }
319 rcu_read_unlock();
320
321 if (baddr) {
322 fl6->saddr = baddr->v6.sin6_addr;
323 fl6->fl6_sport = baddr->v6.sin6_port;
324 final_p = fl6_update_dst(fl6, np->opt, &final);
325 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
326 }
327
328out:
329 if (!IS_ERR_OR_NULL(dst)) {
330 struct rt6_info *rt;
331
332 rt = (struct rt6_info *)dst;
333 t->dst = dst;
334 t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
335 pr_debug("rt6_dst:%pI6 rt6_src:%pI6\n", &rt->rt6i_dst.addr,
336 &fl6->saddr);
337 } else {
338 t->dst = NULL;
339
340 pr_debug("no route\n");
341 }
342}
343
344/* Returns the number of consecutive initial bits that match in the 2 ipv6
345 * addresses.
346 */
347static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
348 union sctp_addr *s2)
349{
350 return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
351}
352
353/* Fills in the source address(saddr) based on the destination address(daddr)
354 * and asoc's bind address list.
355 */
356static void sctp_v6_get_saddr(struct sctp_sock *sk,
357 struct sctp_transport *t,
358 struct flowi *fl)
359{
360 struct flowi6 *fl6 = &fl->u.ip6;
361 union sctp_addr *saddr = &t->saddr;
362
363 pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
364
365 if (t->dst) {
366 saddr->v6.sin6_family = AF_INET6;
367 saddr->v6.sin6_addr = fl6->saddr;
368 }
369}
370
371/* Make a copy of all potential local addresses. */
372static void sctp_v6_copy_addrlist(struct list_head *addrlist,
373 struct net_device *dev)
374{
375 struct inet6_dev *in6_dev;
376 struct inet6_ifaddr *ifp;
377 struct sctp_sockaddr_entry *addr;
378
379 rcu_read_lock();
380 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
381 rcu_read_unlock();
382 return;
383 }
384
385 read_lock_bh(&in6_dev->lock);
386 list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
387 /* Add the address to the local list. */
388 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
389 if (addr) {
390 addr->a.v6.sin6_family = AF_INET6;
391 addr->a.v6.sin6_port = 0;
392 addr->a.v6.sin6_addr = ifp->addr;
393 addr->a.v6.sin6_scope_id = dev->ifindex;
394 addr->valid = 1;
395 INIT_LIST_HEAD(&addr->list);
396 list_add_tail(&addr->list, addrlist);
397 }
398 }
399
400 read_unlock_bh(&in6_dev->lock);
401 rcu_read_unlock();
402}
403
404/* Initialize a sockaddr_storage from in incoming skb. */
405static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb,
406 int is_saddr)
407{
408 __be16 *port;
409 struct sctphdr *sh;
410
411 port = &addr->v6.sin6_port;
412 addr->v6.sin6_family = AF_INET6;
413 addr->v6.sin6_flowinfo = 0; /* FIXME */
414 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
415
416 sh = sctp_hdr(skb);
417 if (is_saddr) {
418 *port = sh->source;
419 addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
420 } else {
421 *port = sh->dest;
422 addr->v6.sin6_addr = ipv6_hdr(skb)->daddr;
423 }
424}
425
426/* Initialize an sctp_addr from a socket. */
427static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
428{
429 addr->v6.sin6_family = AF_INET6;
430 addr->v6.sin6_port = 0;
431 addr->v6.sin6_addr = sk->sk_v6_rcv_saddr;
432}
433
434/* Initialize sk->sk_rcv_saddr from sctp_addr. */
435static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
436{
437 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
438 sk->sk_v6_rcv_saddr.s6_addr32[0] = 0;
439 sk->sk_v6_rcv_saddr.s6_addr32[1] = 0;
440 sk->sk_v6_rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
441 sk->sk_v6_rcv_saddr.s6_addr32[3] =
442 addr->v4.sin_addr.s_addr;
443 } else {
444 sk->sk_v6_rcv_saddr = addr->v6.sin6_addr;
445 }
446}
447
448/* Initialize sk->sk_daddr from sctp_addr. */
449static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
450{
451 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
452 sk->sk_v6_daddr.s6_addr32[0] = 0;
453 sk->sk_v6_daddr.s6_addr32[1] = 0;
454 sk->sk_v6_daddr.s6_addr32[2] = htonl(0x0000ffff);
455 sk->sk_v6_daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
456 } else {
457 sk->sk_v6_daddr = addr->v6.sin6_addr;
458 }
459}
460
461/* Initialize a sctp_addr from an address parameter. */
462static void sctp_v6_from_addr_param(union sctp_addr *addr,
463 union sctp_addr_param *param,
464 __be16 port, int iif)
465{
466 addr->v6.sin6_family = AF_INET6;
467 addr->v6.sin6_port = port;
468 addr->v6.sin6_flowinfo = 0; /* BUG */
469 addr->v6.sin6_addr = param->v6.addr;
470 addr->v6.sin6_scope_id = iif;
471}
472
473/* Initialize an address parameter from a sctp_addr and return the length
474 * of the address parameter.
475 */
476static int sctp_v6_to_addr_param(const union sctp_addr *addr,
477 union sctp_addr_param *param)
478{
479 int length = sizeof(sctp_ipv6addr_param_t);
480
481 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
482 param->v6.param_hdr.length = htons(length);
483 param->v6.addr = addr->v6.sin6_addr;
484
485 return length;
486}
487
488/* Initialize a sctp_addr from struct in6_addr. */
489static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
490 __be16 port)
491{
492 addr->sa.sa_family = AF_INET6;
493 addr->v6.sin6_port = port;
494 addr->v6.sin6_addr = *saddr;
495}
496
497/* Compare addresses exactly.
498 * v4-mapped-v6 is also in consideration.
499 */
500static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
501 const union sctp_addr *addr2)
502{
503 if (addr1->sa.sa_family != addr2->sa.sa_family) {
504 if (addr1->sa.sa_family == AF_INET &&
505 addr2->sa.sa_family == AF_INET6 &&
506 ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) {
507 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
508 addr2->v6.sin6_addr.s6_addr32[3] ==
509 addr1->v4.sin_addr.s_addr)
510 return 1;
511 }
512 if (addr2->sa.sa_family == AF_INET &&
513 addr1->sa.sa_family == AF_INET6 &&
514 ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) {
515 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
516 addr1->v6.sin6_addr.s6_addr32[3] ==
517 addr2->v4.sin_addr.s_addr)
518 return 1;
519 }
520 return 0;
521 }
522 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
523 return 0;
524 /* If this is a linklocal address, compare the scope_id. */
525 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
526 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
527 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
528 return 0;
529 }
530 }
531
532 return 1;
533}
534
535/* Initialize addr struct to INADDR_ANY. */
536static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
537{
538 memset(addr, 0x00, sizeof(union sctp_addr));
539 addr->v6.sin6_family = AF_INET6;
540 addr->v6.sin6_port = port;
541}
542
543/* Is this a wildcard address? */
544static int sctp_v6_is_any(const union sctp_addr *addr)
545{
546 return ipv6_addr_any(&addr->v6.sin6_addr);
547}
548
549/* Should this be available for binding? */
550static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
551{
552 int type;
553 const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
554
555 type = ipv6_addr_type(in6);
556 if (IPV6_ADDR_ANY == type)
557 return 1;
558 if (type == IPV6_ADDR_MAPPED) {
559 if (sp && !sp->v4mapped)
560 return 0;
561 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
562 return 0;
563 sctp_v6_map_v4(addr);
564 return sctp_get_af_specific(AF_INET)->available(addr, sp);
565 }
566 if (!(type & IPV6_ADDR_UNICAST))
567 return 0;
568
569 return ipv6_chk_addr(sock_net(&sp->inet.sk), in6, NULL, 0);
570}
571
572/* This function checks if the address is a valid address to be used for
573 * SCTP.
574 *
575 * Output:
576 * Return 0 - If the address is a non-unicast or an illegal address.
577 * Return 1 - If the address is a unicast.
578 */
579static int sctp_v6_addr_valid(union sctp_addr *addr,
580 struct sctp_sock *sp,
581 const struct sk_buff *skb)
582{
583 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
584
585 /* Support v4-mapped-v6 address. */
586 if (ret == IPV6_ADDR_MAPPED) {
587 /* Note: This routine is used in input, so v4-mapped-v6
588 * are disallowed here when there is no sctp_sock.
589 */
590 if (!sp || !sp->v4mapped)
591 return 0;
592 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
593 return 0;
594 sctp_v6_map_v4(addr);
595 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
596 }
597
598 /* Is this a non-unicast address */
599 if (!(ret & IPV6_ADDR_UNICAST))
600 return 0;
601
602 return 1;
603}
604
605/* What is the scope of 'addr'? */
606static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
607{
608 int v6scope;
609 sctp_scope_t retval;
610
611 /* The IPv6 scope is really a set of bit fields.
612 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
613 */
614
615 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
616 switch (v6scope) {
617 case IFA_HOST:
618 retval = SCTP_SCOPE_LOOPBACK;
619 break;
620 case IFA_LINK:
621 retval = SCTP_SCOPE_LINK;
622 break;
623 case IFA_SITE:
624 retval = SCTP_SCOPE_PRIVATE;
625 break;
626 default:
627 retval = SCTP_SCOPE_GLOBAL;
628 break;
629 }
630
631 return retval;
632}
633
634/* Create and initialize a new sk for the socket to be returned by accept(). */
635static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
636 struct sctp_association *asoc)
637{
638 struct sock *newsk;
639 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
640 struct sctp6_sock *newsctp6sk;
641
642 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot);
643 if (!newsk)
644 goto out;
645
646 sock_init_data(NULL, newsk);
647
648 sctp_copy_sock(newsk, sk, asoc);
649 sock_reset_flag(sk, SOCK_ZAPPED);
650
651 newsctp6sk = (struct sctp6_sock *)newsk;
652 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
653
654 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
655
656 newnp = inet6_sk(newsk);
657
658 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
659
660 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
661 * and getpeername().
662 */
663 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
664
665 newsk->sk_v6_rcv_saddr = sk->sk_v6_rcv_saddr;
666
667 sk_refcnt_debug_inc(newsk);
668
669 if (newsk->sk_prot->init(newsk)) {
670 sk_common_release(newsk);
671 newsk = NULL;
672 }
673
674out:
675 return newsk;
676}
677
678/* Map v4 address to mapped v6 address */
679static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
680{
681 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
682 sctp_v4_map_v6(addr);
683}
684
685/* Where did this skb come from? */
686static int sctp_v6_skb_iif(const struct sk_buff *skb)
687{
688 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
689 return opt->iif;
690}
691
692/* Was this packet marked by Explicit Congestion Notification? */
693static int sctp_v6_is_ce(const struct sk_buff *skb)
694{
695 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
696}
697
698/* Dump the v6 addr to the seq file. */
699static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
700{
701 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
702}
703
704static void sctp_v6_ecn_capable(struct sock *sk)
705{
706 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
707}
708
709/* Initialize a PF_INET6 socket msg_name. */
710static void sctp_inet6_msgname(char *msgname, int *addr_len)
711{
712 struct sockaddr_in6 *sin6;
713
714 sin6 = (struct sockaddr_in6 *)msgname;
715 sin6->sin6_family = AF_INET6;
716 sin6->sin6_flowinfo = 0;
717 sin6->sin6_scope_id = 0; /*FIXME */
718 *addr_len = sizeof(struct sockaddr_in6);
719}
720
721/* Initialize a PF_INET msgname from a ulpevent. */
722static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
723 char *msgname, int *addrlen)
724{
725 struct sockaddr_in6 *sin6, *sin6from;
726
727 if (msgname) {
728 union sctp_addr *addr;
729 struct sctp_association *asoc;
730
731 asoc = event->asoc;
732 sctp_inet6_msgname(msgname, addrlen);
733 sin6 = (struct sockaddr_in6 *)msgname;
734 sin6->sin6_port = htons(asoc->peer.port);
735 addr = &asoc->peer.primary_addr;
736
737 /* Note: If we go to a common v6 format, this code
738 * will change.
739 */
740
741 /* Map ipv4 address into v4-mapped-on-v6 address. */
742 if (sctp_sk(asoc->base.sk)->v4mapped &&
743 AF_INET == addr->sa.sa_family) {
744 sctp_v4_map_v6((union sctp_addr *)sin6);
745 sin6->sin6_addr.s6_addr32[3] =
746 addr->v4.sin_addr.s_addr;
747 return;
748 }
749
750 sin6from = &asoc->peer.primary_addr.v6;
751 sin6->sin6_addr = sin6from->sin6_addr;
752 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
753 sin6->sin6_scope_id = sin6from->sin6_scope_id;
754 }
755}
756
757/* Initialize a msg_name from an inbound skb. */
758static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
759 int *addr_len)
760{
761 struct sctphdr *sh;
762 struct sockaddr_in6 *sin6;
763
764 if (msgname) {
765 sctp_inet6_msgname(msgname, addr_len);
766 sin6 = (struct sockaddr_in6 *)msgname;
767 sh = sctp_hdr(skb);
768 sin6->sin6_port = sh->source;
769
770 /* Map ipv4 address into v4-mapped-on-v6 address. */
771 if (sctp_sk(skb->sk)->v4mapped &&
772 ip_hdr(skb)->version == 4) {
773 sctp_v4_map_v6((union sctp_addr *)sin6);
774 sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr;
775 return;
776 }
777
778 /* Otherwise, just copy the v6 address. */
779 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
780 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
781 struct sctp_ulpevent *ev = sctp_skb2event(skb);
782 sin6->sin6_scope_id = ev->iif;
783 }
784 }
785}
786
787/* Do we support this AF? */
788static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
789{
790 switch (family) {
791 case AF_INET6:
792 return 1;
793 /* v4-mapped-v6 addresses */
794 case AF_INET:
795 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
796 return 1;
797 default:
798 return 0;
799 }
800}
801
802/* Address matching with wildcards allowed. This extra level
803 * of indirection lets us choose whether a PF_INET6 should
804 * disallow any v4 addresses if we so choose.
805 */
806static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
807 const union sctp_addr *addr2,
808 struct sctp_sock *opt)
809{
810 struct sctp_af *af1, *af2;
811 struct sock *sk = sctp_opt2sk(opt);
812
813 af1 = sctp_get_af_specific(addr1->sa.sa_family);
814 af2 = sctp_get_af_specific(addr2->sa.sa_family);
815
816 if (!af1 || !af2)
817 return 0;
818
819 /* If the socket is IPv6 only, v4 addrs will not match */
820 if (__ipv6_only_sock(sk) && af1 != af2)
821 return 0;
822
823 /* Today, wildcard AF_INET/AF_INET6. */
824 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
825 return 1;
826
827 if (addr1->sa.sa_family != addr2->sa.sa_family)
828 return 0;
829
830 return af1->cmp_addr(addr1, addr2);
831}
832
833/* Verify that the provided sockaddr looks bindable. Common verification,
834 * has already been taken care of.
835 */
836static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
837{
838 struct sctp_af *af;
839
840 /* ASSERT: address family has already been verified. */
841 if (addr->sa.sa_family != AF_INET6)
842 af = sctp_get_af_specific(addr->sa.sa_family);
843 else {
844 int type = ipv6_addr_type(&addr->v6.sin6_addr);
845 struct net_device *dev;
846
847 if (type & IPV6_ADDR_LINKLOCAL) {
848 struct net *net;
849 if (!addr->v6.sin6_scope_id)
850 return 0;
851 net = sock_net(&opt->inet.sk);
852 rcu_read_lock();
853 dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id);
854 if (!dev ||
855 !ipv6_chk_addr(net, &addr->v6.sin6_addr, dev, 0)) {
856 rcu_read_unlock();
857 return 0;
858 }
859 rcu_read_unlock();
860 } else if (type == IPV6_ADDR_MAPPED) {
861 if (!opt->v4mapped)
862 return 0;
863 }
864
865 af = opt->pf->af;
866 }
867 return af->available(addr, opt);
868}
869
870/* Verify that the provided sockaddr looks sendable. Common verification,
871 * has already been taken care of.
872 */
873static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
874{
875 struct sctp_af *af = NULL;
876
877 /* ASSERT: address family has already been verified. */
878 if (addr->sa.sa_family != AF_INET6)
879 af = sctp_get_af_specific(addr->sa.sa_family);
880 else {
881 int type = ipv6_addr_type(&addr->v6.sin6_addr);
882 struct net_device *dev;
883
884 if (type & IPV6_ADDR_LINKLOCAL) {
885 if (!addr->v6.sin6_scope_id)
886 return 0;
887 rcu_read_lock();
888 dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk),
889 addr->v6.sin6_scope_id);
890 rcu_read_unlock();
891 if (!dev)
892 return 0;
893 }
894 af = opt->pf->af;
895 }
896
897 return af != NULL;
898}
899
900/* Fill in Supported Address Type information for INIT and INIT-ACK
901 * chunks. Note: In the future, we may want to look at sock options
902 * to determine whether a PF_INET6 socket really wants to have IPV4
903 * addresses.
904 * Returns number of addresses supported.
905 */
906static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
907 __be16 *types)
908{
909 types[0] = SCTP_PARAM_IPV6_ADDRESS;
910 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
911 types[1] = SCTP_PARAM_IPV4_ADDRESS;
912 return 2;
913 }
914 return 1;
915}
916
917static const struct proto_ops inet6_seqpacket_ops = {
918 .family = PF_INET6,
919 .owner = THIS_MODULE,
920 .release = inet6_release,
921 .bind = inet6_bind,
922 .connect = inet_dgram_connect,
923 .socketpair = sock_no_socketpair,
924 .accept = inet_accept,
925 .getname = inet6_getname,
926 .poll = sctp_poll,
927 .ioctl = inet6_ioctl,
928 .listen = sctp_inet_listen,
929 .shutdown = inet_shutdown,
930 .setsockopt = sock_common_setsockopt,
931 .getsockopt = sock_common_getsockopt,
932 .sendmsg = inet_sendmsg,
933 .recvmsg = sock_common_recvmsg,
934 .mmap = sock_no_mmap,
935#ifdef CONFIG_COMPAT
936 .compat_setsockopt = compat_sock_common_setsockopt,
937 .compat_getsockopt = compat_sock_common_getsockopt,
938#endif
939};
940
941static struct inet_protosw sctpv6_seqpacket_protosw = {
942 .type = SOCK_SEQPACKET,
943 .protocol = IPPROTO_SCTP,
944 .prot = &sctpv6_prot,
945 .ops = &inet6_seqpacket_ops,
946 .no_check = 0,
947 .flags = SCTP_PROTOSW_FLAG
948};
949static struct inet_protosw sctpv6_stream_protosw = {
950 .type = SOCK_STREAM,
951 .protocol = IPPROTO_SCTP,
952 .prot = &sctpv6_prot,
953 .ops = &inet6_seqpacket_ops,
954 .no_check = 0,
955 .flags = SCTP_PROTOSW_FLAG,
956};
957
958static int sctp6_rcv(struct sk_buff *skb)
959{
960 return sctp_rcv(skb) ? -1 : 0;
961}
962
963static const struct inet6_protocol sctpv6_protocol = {
964 .handler = sctp6_rcv,
965 .err_handler = sctp_v6_err,
966 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
967};
968
969static struct sctp_af sctp_af_inet6 = {
970 .sa_family = AF_INET6,
971 .sctp_xmit = sctp_v6_xmit,
972 .setsockopt = ipv6_setsockopt,
973 .getsockopt = ipv6_getsockopt,
974 .get_dst = sctp_v6_get_dst,
975 .get_saddr = sctp_v6_get_saddr,
976 .copy_addrlist = sctp_v6_copy_addrlist,
977 .from_skb = sctp_v6_from_skb,
978 .from_sk = sctp_v6_from_sk,
979 .to_sk_saddr = sctp_v6_to_sk_saddr,
980 .to_sk_daddr = sctp_v6_to_sk_daddr,
981 .from_addr_param = sctp_v6_from_addr_param,
982 .to_addr_param = sctp_v6_to_addr_param,
983 .cmp_addr = sctp_v6_cmp_addr,
984 .scope = sctp_v6_scope,
985 .addr_valid = sctp_v6_addr_valid,
986 .inaddr_any = sctp_v6_inaddr_any,
987 .is_any = sctp_v6_is_any,
988 .available = sctp_v6_available,
989 .skb_iif = sctp_v6_skb_iif,
990 .is_ce = sctp_v6_is_ce,
991 .seq_dump_addr = sctp_v6_seq_dump_addr,
992 .ecn_capable = sctp_v6_ecn_capable,
993 .net_header_len = sizeof(struct ipv6hdr),
994 .sockaddr_len = sizeof(struct sockaddr_in6),
995#ifdef CONFIG_COMPAT
996 .compat_setsockopt = compat_ipv6_setsockopt,
997 .compat_getsockopt = compat_ipv6_getsockopt,
998#endif
999};
1000
1001static struct sctp_pf sctp_pf_inet6 = {
1002 .event_msgname = sctp_inet6_event_msgname,
1003 .skb_msgname = sctp_inet6_skb_msgname,
1004 .af_supported = sctp_inet6_af_supported,
1005 .cmp_addr = sctp_inet6_cmp_addr,
1006 .bind_verify = sctp_inet6_bind_verify,
1007 .send_verify = sctp_inet6_send_verify,
1008 .supported_addrs = sctp_inet6_supported_addrs,
1009 .create_accept_sk = sctp_v6_create_accept_sk,
1010 .addr_v4map = sctp_v6_addr_v4map,
1011 .af = &sctp_af_inet6,
1012};
1013
1014/* Initialize IPv6 support and register with socket layer. */
1015void sctp_v6_pf_init(void)
1016{
1017 /* Register the SCTP specific PF_INET6 functions. */
1018 sctp_register_pf(&sctp_pf_inet6, PF_INET6);
1019
1020 /* Register the SCTP specific AF_INET6 functions. */
1021 sctp_register_af(&sctp_af_inet6);
1022}
1023
1024void sctp_v6_pf_exit(void)
1025{
1026 list_del(&sctp_af_inet6.list);
1027}
1028
1029/* Initialize IPv6 support and register with socket layer. */
1030int sctp_v6_protosw_init(void)
1031{
1032 int rc;
1033
1034 rc = proto_register(&sctpv6_prot, 1);
1035 if (rc)
1036 return rc;
1037
1038 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1039 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1040 inet6_register_protosw(&sctpv6_stream_protosw);
1041
1042 return 0;
1043}
1044
1045void sctp_v6_protosw_exit(void)
1046{
1047 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1048 inet6_unregister_protosw(&sctpv6_stream_protosw);
1049 proto_unregister(&sctpv6_prot);
1050}
1051
1052
1053/* Register with inet6 layer. */
1054int sctp_v6_add_protocol(void)
1055{
1056 /* Register notifier for inet6 address additions/deletions. */
1057 register_inet6addr_notifier(&sctp_inet6addr_notifier);
1058
1059 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1060 return -EAGAIN;
1061
1062 return 0;
1063}
1064
1065/* Unregister with inet6 layer. */
1066void sctp_v6_del_protocol(void)
1067{
1068 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1069 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
1070}
1/* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2002, 2004
3 * Copyright (c) 2001 Nokia, Inc.
4 * Copyright (c) 2001 La Monte H.P. Yarroll
5 * Copyright (c) 2002-2003 Intel Corp.
6 *
7 * This file is part of the SCTP kernel implementation
8 *
9 * SCTP over IPv6.
10 *
11 * This SCTP implementation is free software;
12 * you can redistribute it and/or modify it under the terms of
13 * the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
17 * This SCTP implementation is distributed in the hope that it
18 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
19 * ************************
20 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
21 * See the GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with GNU CC; see the file COPYING. If not, write to
25 * the Free Software Foundation, 59 Temple Place - Suite 330,
26 * Boston, MA 02111-1307, USA.
27 *
28 * Please send any bug reports or fixes you make to the
29 * email address(es):
30 * lksctp developers <lksctp-developers@lists.sourceforge.net>
31 *
32 * Or submit a bug report through the following website:
33 * http://www.sf.net/projects/lksctp
34 *
35 * Written or modified by:
36 * Le Yanqun <yanqun.le@nokia.com>
37 * Hui Huang <hui.huang@nokia.com>
38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Sridhar Samudrala <sri@us.ibm.com>
40 * Jon Grimm <jgrimm@us.ibm.com>
41 * Ardelle Fan <ardelle.fan@intel.com>
42 *
43 * Based on:
44 * linux/net/ipv6/tcp_ipv6.c
45 *
46 * Any bugs reported given to us we will try to fix... any fixes shared will
47 * be incorporated into the next SCTP release.
48 */
49
50#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
51
52#include <linux/module.h>
53#include <linux/errno.h>
54#include <linux/types.h>
55#include <linux/socket.h>
56#include <linux/sockios.h>
57#include <linux/net.h>
58#include <linux/in.h>
59#include <linux/in6.h>
60#include <linux/netdevice.h>
61#include <linux/init.h>
62#include <linux/ipsec.h>
63#include <linux/slab.h>
64
65#include <linux/ipv6.h>
66#include <linux/icmpv6.h>
67#include <linux/random.h>
68#include <linux/seq_file.h>
69
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip.h>
73#include <net/ipv6.h>
74#include <net/transp_v6.h>
75#include <net/addrconf.h>
76#include <net/ip6_route.h>
77#include <net/inet_common.h>
78#include <net/inet_ecn.h>
79#include <net/sctp/sctp.h>
80
81#include <asm/uaccess.h>
82
83static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
84 union sctp_addr *s2);
85static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
86 __be16 port);
87static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
88 const union sctp_addr *addr2);
89
90/* Event handler for inet6 address addition/deletion events.
91 * The sctp_local_addr_list needs to be protocted by a spin lock since
92 * multiple notifiers (say IPv4 and IPv6) may be running at the same
93 * time and thus corrupt the list.
94 * The reader side is protected with RCU.
95 */
96static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
97 void *ptr)
98{
99 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
100 struct sctp_sockaddr_entry *addr = NULL;
101 struct sctp_sockaddr_entry *temp;
102 int found = 0;
103
104 switch (ev) {
105 case NETDEV_UP:
106 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
107 if (addr) {
108 addr->a.v6.sin6_family = AF_INET6;
109 addr->a.v6.sin6_port = 0;
110 addr->a.v6.sin6_addr = ifa->addr;
111 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
112 addr->valid = 1;
113 spin_lock_bh(&sctp_local_addr_lock);
114 list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
115 sctp_addr_wq_mgmt(addr, SCTP_ADDR_NEW);
116 spin_unlock_bh(&sctp_local_addr_lock);
117 }
118 break;
119 case NETDEV_DOWN:
120 spin_lock_bh(&sctp_local_addr_lock);
121 list_for_each_entry_safe(addr, temp,
122 &sctp_local_addr_list, list) {
123 if (addr->a.sa.sa_family == AF_INET6 &&
124 ipv6_addr_equal(&addr->a.v6.sin6_addr,
125 &ifa->addr)) {
126 sctp_addr_wq_mgmt(addr, SCTP_ADDR_DEL);
127 found = 1;
128 addr->valid = 0;
129 list_del_rcu(&addr->list);
130 break;
131 }
132 }
133 spin_unlock_bh(&sctp_local_addr_lock);
134 if (found)
135 kfree_rcu(addr, rcu);
136 break;
137 }
138
139 return NOTIFY_DONE;
140}
141
142static struct notifier_block sctp_inet6addr_notifier = {
143 .notifier_call = sctp_inet6addr_event,
144};
145
146/* ICMP error handler. */
147SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
148 u8 type, u8 code, int offset, __be32 info)
149{
150 struct inet6_dev *idev;
151 struct sock *sk;
152 struct sctp_association *asoc;
153 struct sctp_transport *transport;
154 struct ipv6_pinfo *np;
155 sk_buff_data_t saveip, savesctp;
156 int err;
157
158 idev = in6_dev_get(skb->dev);
159
160 /* Fix up skb to look at the embedded net header. */
161 saveip = skb->network_header;
162 savesctp = skb->transport_header;
163 skb_reset_network_header(skb);
164 skb_set_transport_header(skb, offset);
165 sk = sctp_err_lookup(AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
166 /* Put back, the original pointers. */
167 skb->network_header = saveip;
168 skb->transport_header = savesctp;
169 if (!sk) {
170 ICMP6_INC_STATS_BH(dev_net(skb->dev), idev, ICMP6_MIB_INERRORS);
171 goto out;
172 }
173
174 /* Warning: The sock lock is held. Remember to call
175 * sctp_err_finish!
176 */
177
178 switch (type) {
179 case ICMPV6_PKT_TOOBIG:
180 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
181 goto out_unlock;
182 case ICMPV6_PARAMPROB:
183 if (ICMPV6_UNK_NEXTHDR == code) {
184 sctp_icmp_proto_unreachable(sk, asoc, transport);
185 goto out_unlock;
186 }
187 break;
188 default:
189 break;
190 }
191
192 np = inet6_sk(sk);
193 icmpv6_err_convert(type, code, &err);
194 if (!sock_owned_by_user(sk) && np->recverr) {
195 sk->sk_err = err;
196 sk->sk_error_report(sk);
197 } else { /* Only an error on timeout */
198 sk->sk_err_soft = err;
199 }
200
201out_unlock:
202 sctp_err_finish(sk, asoc);
203out:
204 if (likely(idev != NULL))
205 in6_dev_put(idev);
206}
207
208/* Based on tcp_v6_xmit() in tcp_ipv6.c. */
209static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
210{
211 struct sock *sk = skb->sk;
212 struct ipv6_pinfo *np = inet6_sk(sk);
213 struct flowi6 fl6;
214
215 memset(&fl6, 0, sizeof(fl6));
216
217 fl6.flowi6_proto = sk->sk_protocol;
218
219 /* Fill in the dest address from the route entry passed with the skb
220 * and the source address from the transport.
221 */
222 fl6.daddr = transport->ipaddr.v6.sin6_addr;
223 fl6.saddr = transport->saddr.v6.sin6_addr;
224
225 fl6.flowlabel = np->flow_label;
226 IP6_ECN_flow_xmit(sk, fl6.flowlabel);
227 if (ipv6_addr_type(&fl6.saddr) & IPV6_ADDR_LINKLOCAL)
228 fl6.flowi6_oif = transport->saddr.v6.sin6_scope_id;
229 else
230 fl6.flowi6_oif = sk->sk_bound_dev_if;
231
232 if (np->opt && np->opt->srcrt) {
233 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
234 fl6.daddr = *rt0->addr;
235 }
236
237 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n",
238 __func__, skb, skb->len,
239 &fl6.saddr, &fl6.daddr);
240
241 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
242
243 if (!(transport->param_flags & SPP_PMTUD_ENABLE))
244 skb->local_df = 1;
245
246 return ip6_xmit(sk, skb, &fl6, np->opt, np->tclass);
247}
248
249/* Returns the dst cache entry for the given source and destination ip
250 * addresses.
251 */
252static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
253 struct flowi *fl, struct sock *sk)
254{
255 struct sctp_association *asoc = t->asoc;
256 struct dst_entry *dst = NULL;
257 struct flowi6 *fl6 = &fl->u.ip6;
258 struct sctp_bind_addr *bp;
259 struct sctp_sockaddr_entry *laddr;
260 union sctp_addr *baddr = NULL;
261 union sctp_addr *daddr = &t->ipaddr;
262 union sctp_addr dst_saddr;
263 __u8 matchlen = 0;
264 __u8 bmatchlen;
265 sctp_scope_t scope;
266
267 memset(fl6, 0, sizeof(struct flowi6));
268 fl6->daddr = daddr->v6.sin6_addr;
269 fl6->fl6_dport = daddr->v6.sin6_port;
270 fl6->flowi6_proto = IPPROTO_SCTP;
271 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
272 fl6->flowi6_oif = daddr->v6.sin6_scope_id;
273
274 SCTP_DEBUG_PRINTK("%s: DST=%pI6 ", __func__, &fl6->daddr);
275
276 if (asoc)
277 fl6->fl6_sport = htons(asoc->base.bind_addr.port);
278
279 if (saddr) {
280 fl6->saddr = saddr->v6.sin6_addr;
281 fl6->fl6_sport = saddr->v6.sin6_port;
282 SCTP_DEBUG_PRINTK("SRC=%pI6 - ", &fl6->saddr);
283 }
284
285 dst = ip6_dst_lookup_flow(sk, fl6, NULL, false);
286 if (!asoc || saddr)
287 goto out;
288
289 bp = &asoc->base.bind_addr;
290 scope = sctp_scope(daddr);
291 /* ip6_dst_lookup has filled in the fl6->saddr for us. Check
292 * to see if we can use it.
293 */
294 if (!IS_ERR(dst)) {
295 /* Walk through the bind address list and look for a bind
296 * address that matches the source address of the returned dst.
297 */
298 sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
299 rcu_read_lock();
300 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
301 if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC))
302 continue;
303
304 /* Do not compare against v4 addrs */
305 if ((laddr->a.sa.sa_family == AF_INET6) &&
306 (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
307 rcu_read_unlock();
308 goto out;
309 }
310 }
311 rcu_read_unlock();
312 /* None of the bound addresses match the source address of the
313 * dst. So release it.
314 */
315 dst_release(dst);
316 dst = NULL;
317 }
318
319 /* Walk through the bind address list and try to get the
320 * best source address for a given destination.
321 */
322 rcu_read_lock();
323 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
324 if (!laddr->valid && laddr->state != SCTP_ADDR_SRC)
325 continue;
326 if ((laddr->a.sa.sa_family == AF_INET6) &&
327 (scope <= sctp_scope(&laddr->a))) {
328 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
329 if (!baddr || (matchlen < bmatchlen)) {
330 baddr = &laddr->a;
331 matchlen = bmatchlen;
332 }
333 }
334 }
335 rcu_read_unlock();
336 if (baddr) {
337 fl6->saddr = baddr->v6.sin6_addr;
338 fl6->fl6_sport = baddr->v6.sin6_port;
339 dst = ip6_dst_lookup_flow(sk, fl6, NULL, false);
340 }
341
342out:
343 if (!IS_ERR(dst)) {
344 struct rt6_info *rt;
345 rt = (struct rt6_info *)dst;
346 t->dst = dst;
347 SCTP_DEBUG_PRINTK("rt6_dst:%pI6 rt6_src:%pI6\n",
348 &rt->rt6i_dst.addr, &fl6->saddr);
349 } else {
350 t->dst = NULL;
351 SCTP_DEBUG_PRINTK("NO ROUTE\n");
352 }
353}
354
355/* Returns the number of consecutive initial bits that match in the 2 ipv6
356 * addresses.
357 */
358static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
359 union sctp_addr *s2)
360{
361 return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
362}
363
364/* Fills in the source address(saddr) based on the destination address(daddr)
365 * and asoc's bind address list.
366 */
367static void sctp_v6_get_saddr(struct sctp_sock *sk,
368 struct sctp_transport *t,
369 struct flowi *fl)
370{
371 struct flowi6 *fl6 = &fl->u.ip6;
372 union sctp_addr *saddr = &t->saddr;
373
374 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
375
376 if (t->dst) {
377 saddr->v6.sin6_family = AF_INET6;
378 saddr->v6.sin6_addr = fl6->saddr;
379 }
380}
381
382/* Make a copy of all potential local addresses. */
383static void sctp_v6_copy_addrlist(struct list_head *addrlist,
384 struct net_device *dev)
385{
386 struct inet6_dev *in6_dev;
387 struct inet6_ifaddr *ifp;
388 struct sctp_sockaddr_entry *addr;
389
390 rcu_read_lock();
391 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
392 rcu_read_unlock();
393 return;
394 }
395
396 read_lock_bh(&in6_dev->lock);
397 list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
398 /* Add the address to the local list. */
399 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
400 if (addr) {
401 addr->a.v6.sin6_family = AF_INET6;
402 addr->a.v6.sin6_port = 0;
403 addr->a.v6.sin6_addr = ifp->addr;
404 addr->a.v6.sin6_scope_id = dev->ifindex;
405 addr->valid = 1;
406 INIT_LIST_HEAD(&addr->list);
407 list_add_tail(&addr->list, addrlist);
408 }
409 }
410
411 read_unlock_bh(&in6_dev->lock);
412 rcu_read_unlock();
413}
414
415/* Initialize a sockaddr_storage from in incoming skb. */
416static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
417 int is_saddr)
418{
419 __be16 *port;
420 struct sctphdr *sh;
421
422 port = &addr->v6.sin6_port;
423 addr->v6.sin6_family = AF_INET6;
424 addr->v6.sin6_flowinfo = 0; /* FIXME */
425 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
426
427 sh = sctp_hdr(skb);
428 if (is_saddr) {
429 *port = sh->source;
430 addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
431 } else {
432 *port = sh->dest;
433 addr->v6.sin6_addr = ipv6_hdr(skb)->daddr;
434 }
435}
436
437/* Initialize an sctp_addr from a socket. */
438static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
439{
440 addr->v6.sin6_family = AF_INET6;
441 addr->v6.sin6_port = 0;
442 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
443}
444
445/* Initialize sk->sk_rcv_saddr from sctp_addr. */
446static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
447{
448 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
449 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
450 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
451 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
452 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
453 addr->v4.sin_addr.s_addr;
454 } else {
455 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
456 }
457}
458
459/* Initialize sk->sk_daddr from sctp_addr. */
460static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
461{
462 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
463 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
464 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
465 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
466 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
467 } else {
468 inet6_sk(sk)->daddr = addr->v6.sin6_addr;
469 }
470}
471
472/* Initialize a sctp_addr from an address parameter. */
473static void sctp_v6_from_addr_param(union sctp_addr *addr,
474 union sctp_addr_param *param,
475 __be16 port, int iif)
476{
477 addr->v6.sin6_family = AF_INET6;
478 addr->v6.sin6_port = port;
479 addr->v6.sin6_flowinfo = 0; /* BUG */
480 addr->v6.sin6_addr = param->v6.addr;
481 addr->v6.sin6_scope_id = iif;
482}
483
484/* Initialize an address parameter from a sctp_addr and return the length
485 * of the address parameter.
486 */
487static int sctp_v6_to_addr_param(const union sctp_addr *addr,
488 union sctp_addr_param *param)
489{
490 int length = sizeof(sctp_ipv6addr_param_t);
491
492 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
493 param->v6.param_hdr.length = htons(length);
494 param->v6.addr = addr->v6.sin6_addr;
495
496 return length;
497}
498
499/* Initialize a sctp_addr from struct in6_addr. */
500static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
501 __be16 port)
502{
503 addr->sa.sa_family = AF_INET6;
504 addr->v6.sin6_port = port;
505 addr->v6.sin6_addr = *saddr;
506}
507
508/* Compare addresses exactly.
509 * v4-mapped-v6 is also in consideration.
510 */
511static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
512 const union sctp_addr *addr2)
513{
514 if (addr1->sa.sa_family != addr2->sa.sa_family) {
515 if (addr1->sa.sa_family == AF_INET &&
516 addr2->sa.sa_family == AF_INET6 &&
517 ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) {
518 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
519 addr2->v6.sin6_addr.s6_addr32[3] ==
520 addr1->v4.sin_addr.s_addr)
521 return 1;
522 }
523 if (addr2->sa.sa_family == AF_INET &&
524 addr1->sa.sa_family == AF_INET6 &&
525 ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) {
526 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
527 addr1->v6.sin6_addr.s6_addr32[3] ==
528 addr2->v4.sin_addr.s_addr)
529 return 1;
530 }
531 return 0;
532 }
533 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
534 return 0;
535 /* If this is a linklocal address, compare the scope_id. */
536 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
537 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
538 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
539 return 0;
540 }
541 }
542
543 return 1;
544}
545
546/* Initialize addr struct to INADDR_ANY. */
547static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
548{
549 memset(addr, 0x00, sizeof(union sctp_addr));
550 addr->v6.sin6_family = AF_INET6;
551 addr->v6.sin6_port = port;
552}
553
554/* Is this a wildcard address? */
555static int sctp_v6_is_any(const union sctp_addr *addr)
556{
557 return ipv6_addr_any(&addr->v6.sin6_addr);
558}
559
560/* Should this be available for binding? */
561static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
562{
563 int type;
564 const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
565
566 type = ipv6_addr_type(in6);
567 if (IPV6_ADDR_ANY == type)
568 return 1;
569 if (type == IPV6_ADDR_MAPPED) {
570 if (sp && !sp->v4mapped)
571 return 0;
572 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
573 return 0;
574 sctp_v6_map_v4(addr);
575 return sctp_get_af_specific(AF_INET)->available(addr, sp);
576 }
577 if (!(type & IPV6_ADDR_UNICAST))
578 return 0;
579
580 return ipv6_chk_addr(&init_net, in6, NULL, 0);
581}
582
583/* This function checks if the address is a valid address to be used for
584 * SCTP.
585 *
586 * Output:
587 * Return 0 - If the address is a non-unicast or an illegal address.
588 * Return 1 - If the address is a unicast.
589 */
590static int sctp_v6_addr_valid(union sctp_addr *addr,
591 struct sctp_sock *sp,
592 const struct sk_buff *skb)
593{
594 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
595
596 /* Support v4-mapped-v6 address. */
597 if (ret == IPV6_ADDR_MAPPED) {
598 /* Note: This routine is used in input, so v4-mapped-v6
599 * are disallowed here when there is no sctp_sock.
600 */
601 if (!sp || !sp->v4mapped)
602 return 0;
603 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
604 return 0;
605 sctp_v6_map_v4(addr);
606 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
607 }
608
609 /* Is this a non-unicast address */
610 if (!(ret & IPV6_ADDR_UNICAST))
611 return 0;
612
613 return 1;
614}
615
616/* What is the scope of 'addr'? */
617static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
618{
619 int v6scope;
620 sctp_scope_t retval;
621
622 /* The IPv6 scope is really a set of bit fields.
623 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
624 */
625
626 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
627 switch (v6scope) {
628 case IFA_HOST:
629 retval = SCTP_SCOPE_LOOPBACK;
630 break;
631 case IFA_LINK:
632 retval = SCTP_SCOPE_LINK;
633 break;
634 case IFA_SITE:
635 retval = SCTP_SCOPE_PRIVATE;
636 break;
637 default:
638 retval = SCTP_SCOPE_GLOBAL;
639 break;
640 }
641
642 return retval;
643}
644
645/* Create and initialize a new sk for the socket to be returned by accept(). */
646static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
647 struct sctp_association *asoc)
648{
649 struct sock *newsk;
650 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
651 struct sctp6_sock *newsctp6sk;
652
653 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot);
654 if (!newsk)
655 goto out;
656
657 sock_init_data(NULL, newsk);
658
659 sctp_copy_sock(newsk, sk, asoc);
660 sock_reset_flag(sk, SOCK_ZAPPED);
661
662 newsctp6sk = (struct sctp6_sock *)newsk;
663 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
664
665 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
666
667 newnp = inet6_sk(newsk);
668
669 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
670
671 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
672 * and getpeername().
673 */
674 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
675
676 sk_refcnt_debug_inc(newsk);
677
678 if (newsk->sk_prot->init(newsk)) {
679 sk_common_release(newsk);
680 newsk = NULL;
681 }
682
683out:
684 return newsk;
685}
686
687/* Map v4 address to mapped v6 address */
688static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
689{
690 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
691 sctp_v4_map_v6(addr);
692}
693
694/* Where did this skb come from? */
695static int sctp_v6_skb_iif(const struct sk_buff *skb)
696{
697 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
698 return opt->iif;
699}
700
701/* Was this packet marked by Explicit Congestion Notification? */
702static int sctp_v6_is_ce(const struct sk_buff *skb)
703{
704 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
705}
706
707/* Dump the v6 addr to the seq file. */
708static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
709{
710 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
711}
712
713static void sctp_v6_ecn_capable(struct sock *sk)
714{
715 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
716}
717
718/* Initialize a PF_INET6 socket msg_name. */
719static void sctp_inet6_msgname(char *msgname, int *addr_len)
720{
721 struct sockaddr_in6 *sin6;
722
723 sin6 = (struct sockaddr_in6 *)msgname;
724 sin6->sin6_family = AF_INET6;
725 sin6->sin6_flowinfo = 0;
726 sin6->sin6_scope_id = 0; /*FIXME */
727 *addr_len = sizeof(struct sockaddr_in6);
728}
729
730/* Initialize a PF_INET msgname from a ulpevent. */
731static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
732 char *msgname, int *addrlen)
733{
734 struct sockaddr_in6 *sin6, *sin6from;
735
736 if (msgname) {
737 union sctp_addr *addr;
738 struct sctp_association *asoc;
739
740 asoc = event->asoc;
741 sctp_inet6_msgname(msgname, addrlen);
742 sin6 = (struct sockaddr_in6 *)msgname;
743 sin6->sin6_port = htons(asoc->peer.port);
744 addr = &asoc->peer.primary_addr;
745
746 /* Note: If we go to a common v6 format, this code
747 * will change.
748 */
749
750 /* Map ipv4 address into v4-mapped-on-v6 address. */
751 if (sctp_sk(asoc->base.sk)->v4mapped &&
752 AF_INET == addr->sa.sa_family) {
753 sctp_v4_map_v6((union sctp_addr *)sin6);
754 sin6->sin6_addr.s6_addr32[3] =
755 addr->v4.sin_addr.s_addr;
756 return;
757 }
758
759 sin6from = &asoc->peer.primary_addr.v6;
760 sin6->sin6_addr = sin6from->sin6_addr;
761 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
762 sin6->sin6_scope_id = sin6from->sin6_scope_id;
763 }
764}
765
766/* Initialize a msg_name from an inbound skb. */
767static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
768 int *addr_len)
769{
770 struct sctphdr *sh;
771 struct sockaddr_in6 *sin6;
772
773 if (msgname) {
774 sctp_inet6_msgname(msgname, addr_len);
775 sin6 = (struct sockaddr_in6 *)msgname;
776 sh = sctp_hdr(skb);
777 sin6->sin6_port = sh->source;
778
779 /* Map ipv4 address into v4-mapped-on-v6 address. */
780 if (sctp_sk(skb->sk)->v4mapped &&
781 ip_hdr(skb)->version == 4) {
782 sctp_v4_map_v6((union sctp_addr *)sin6);
783 sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr;
784 return;
785 }
786
787 /* Otherwise, just copy the v6 address. */
788 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
789 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
790 struct sctp_ulpevent *ev = sctp_skb2event(skb);
791 sin6->sin6_scope_id = ev->iif;
792 }
793 }
794}
795
796/* Do we support this AF? */
797static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
798{
799 switch (family) {
800 case AF_INET6:
801 return 1;
802 /* v4-mapped-v6 addresses */
803 case AF_INET:
804 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
805 return 1;
806 default:
807 return 0;
808 }
809}
810
811/* Address matching with wildcards allowed. This extra level
812 * of indirection lets us choose whether a PF_INET6 should
813 * disallow any v4 addresses if we so choose.
814 */
815static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
816 const union sctp_addr *addr2,
817 struct sctp_sock *opt)
818{
819 struct sctp_af *af1, *af2;
820 struct sock *sk = sctp_opt2sk(opt);
821
822 af1 = sctp_get_af_specific(addr1->sa.sa_family);
823 af2 = sctp_get_af_specific(addr2->sa.sa_family);
824
825 if (!af1 || !af2)
826 return 0;
827
828 /* If the socket is IPv6 only, v4 addrs will not match */
829 if (__ipv6_only_sock(sk) && af1 != af2)
830 return 0;
831
832 /* Today, wildcard AF_INET/AF_INET6. */
833 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
834 return 1;
835
836 if (addr1->sa.sa_family != addr2->sa.sa_family)
837 return 0;
838
839 return af1->cmp_addr(addr1, addr2);
840}
841
842/* Verify that the provided sockaddr looks bindable. Common verification,
843 * has already been taken care of.
844 */
845static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
846{
847 struct sctp_af *af;
848
849 /* ASSERT: address family has already been verified. */
850 if (addr->sa.sa_family != AF_INET6)
851 af = sctp_get_af_specific(addr->sa.sa_family);
852 else {
853 int type = ipv6_addr_type(&addr->v6.sin6_addr);
854 struct net_device *dev;
855
856 if (type & IPV6_ADDR_LINKLOCAL) {
857 if (!addr->v6.sin6_scope_id)
858 return 0;
859 rcu_read_lock();
860 dev = dev_get_by_index_rcu(&init_net,
861 addr->v6.sin6_scope_id);
862 if (!dev ||
863 !ipv6_chk_addr(&init_net, &addr->v6.sin6_addr,
864 dev, 0)) {
865 rcu_read_unlock();
866 return 0;
867 }
868 rcu_read_unlock();
869 } else if (type == IPV6_ADDR_MAPPED) {
870 if (!opt->v4mapped)
871 return 0;
872 }
873
874 af = opt->pf->af;
875 }
876 return af->available(addr, opt);
877}
878
879/* Verify that the provided sockaddr looks sendable. Common verification,
880 * has already been taken care of.
881 */
882static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
883{
884 struct sctp_af *af = NULL;
885
886 /* ASSERT: address family has already been verified. */
887 if (addr->sa.sa_family != AF_INET6)
888 af = sctp_get_af_specific(addr->sa.sa_family);
889 else {
890 int type = ipv6_addr_type(&addr->v6.sin6_addr);
891 struct net_device *dev;
892
893 if (type & IPV6_ADDR_LINKLOCAL) {
894 if (!addr->v6.sin6_scope_id)
895 return 0;
896 rcu_read_lock();
897 dev = dev_get_by_index_rcu(&init_net,
898 addr->v6.sin6_scope_id);
899 rcu_read_unlock();
900 if (!dev)
901 return 0;
902 }
903 af = opt->pf->af;
904 }
905
906 return af != NULL;
907}
908
909/* Fill in Supported Address Type information for INIT and INIT-ACK
910 * chunks. Note: In the future, we may want to look at sock options
911 * to determine whether a PF_INET6 socket really wants to have IPV4
912 * addresses.
913 * Returns number of addresses supported.
914 */
915static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
916 __be16 *types)
917{
918 types[0] = SCTP_PARAM_IPV6_ADDRESS;
919 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
920 types[1] = SCTP_PARAM_IPV4_ADDRESS;
921 return 2;
922 }
923 return 1;
924}
925
926static const struct proto_ops inet6_seqpacket_ops = {
927 .family = PF_INET6,
928 .owner = THIS_MODULE,
929 .release = inet6_release,
930 .bind = inet6_bind,
931 .connect = inet_dgram_connect,
932 .socketpair = sock_no_socketpair,
933 .accept = inet_accept,
934 .getname = inet6_getname,
935 .poll = sctp_poll,
936 .ioctl = inet6_ioctl,
937 .listen = sctp_inet_listen,
938 .shutdown = inet_shutdown,
939 .setsockopt = sock_common_setsockopt,
940 .getsockopt = sock_common_getsockopt,
941 .sendmsg = inet_sendmsg,
942 .recvmsg = sock_common_recvmsg,
943 .mmap = sock_no_mmap,
944#ifdef CONFIG_COMPAT
945 .compat_setsockopt = compat_sock_common_setsockopt,
946 .compat_getsockopt = compat_sock_common_getsockopt,
947#endif
948};
949
950static struct inet_protosw sctpv6_seqpacket_protosw = {
951 .type = SOCK_SEQPACKET,
952 .protocol = IPPROTO_SCTP,
953 .prot = &sctpv6_prot,
954 .ops = &inet6_seqpacket_ops,
955 .no_check = 0,
956 .flags = SCTP_PROTOSW_FLAG
957};
958static struct inet_protosw sctpv6_stream_protosw = {
959 .type = SOCK_STREAM,
960 .protocol = IPPROTO_SCTP,
961 .prot = &sctpv6_prot,
962 .ops = &inet6_seqpacket_ops,
963 .no_check = 0,
964 .flags = SCTP_PROTOSW_FLAG,
965};
966
967static int sctp6_rcv(struct sk_buff *skb)
968{
969 return sctp_rcv(skb) ? -1 : 0;
970}
971
972static const struct inet6_protocol sctpv6_protocol = {
973 .handler = sctp6_rcv,
974 .err_handler = sctp_v6_err,
975 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
976};
977
978static struct sctp_af sctp_af_inet6 = {
979 .sa_family = AF_INET6,
980 .sctp_xmit = sctp_v6_xmit,
981 .setsockopt = ipv6_setsockopt,
982 .getsockopt = ipv6_getsockopt,
983 .get_dst = sctp_v6_get_dst,
984 .get_saddr = sctp_v6_get_saddr,
985 .copy_addrlist = sctp_v6_copy_addrlist,
986 .from_skb = sctp_v6_from_skb,
987 .from_sk = sctp_v6_from_sk,
988 .to_sk_saddr = sctp_v6_to_sk_saddr,
989 .to_sk_daddr = sctp_v6_to_sk_daddr,
990 .from_addr_param = sctp_v6_from_addr_param,
991 .to_addr_param = sctp_v6_to_addr_param,
992 .cmp_addr = sctp_v6_cmp_addr,
993 .scope = sctp_v6_scope,
994 .addr_valid = sctp_v6_addr_valid,
995 .inaddr_any = sctp_v6_inaddr_any,
996 .is_any = sctp_v6_is_any,
997 .available = sctp_v6_available,
998 .skb_iif = sctp_v6_skb_iif,
999 .is_ce = sctp_v6_is_ce,
1000 .seq_dump_addr = sctp_v6_seq_dump_addr,
1001 .ecn_capable = sctp_v6_ecn_capable,
1002 .net_header_len = sizeof(struct ipv6hdr),
1003 .sockaddr_len = sizeof(struct sockaddr_in6),
1004#ifdef CONFIG_COMPAT
1005 .compat_setsockopt = compat_ipv6_setsockopt,
1006 .compat_getsockopt = compat_ipv6_getsockopt,
1007#endif
1008};
1009
1010static struct sctp_pf sctp_pf_inet6 = {
1011 .event_msgname = sctp_inet6_event_msgname,
1012 .skb_msgname = sctp_inet6_skb_msgname,
1013 .af_supported = sctp_inet6_af_supported,
1014 .cmp_addr = sctp_inet6_cmp_addr,
1015 .bind_verify = sctp_inet6_bind_verify,
1016 .send_verify = sctp_inet6_send_verify,
1017 .supported_addrs = sctp_inet6_supported_addrs,
1018 .create_accept_sk = sctp_v6_create_accept_sk,
1019 .addr_v4map = sctp_v6_addr_v4map,
1020 .af = &sctp_af_inet6,
1021};
1022
1023/* Initialize IPv6 support and register with socket layer. */
1024void sctp_v6_pf_init(void)
1025{
1026 /* Register the SCTP specific PF_INET6 functions. */
1027 sctp_register_pf(&sctp_pf_inet6, PF_INET6);
1028
1029 /* Register the SCTP specific AF_INET6 functions. */
1030 sctp_register_af(&sctp_af_inet6);
1031}
1032
1033void sctp_v6_pf_exit(void)
1034{
1035 list_del(&sctp_af_inet6.list);
1036}
1037
1038/* Initialize IPv6 support and register with socket layer. */
1039int sctp_v6_protosw_init(void)
1040{
1041 int rc;
1042
1043 rc = proto_register(&sctpv6_prot, 1);
1044 if (rc)
1045 return rc;
1046
1047 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1048 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1049 inet6_register_protosw(&sctpv6_stream_protosw);
1050
1051 return 0;
1052}
1053
1054void sctp_v6_protosw_exit(void)
1055{
1056 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1057 inet6_unregister_protosw(&sctpv6_stream_protosw);
1058 proto_unregister(&sctpv6_prot);
1059}
1060
1061
1062/* Register with inet6 layer. */
1063int sctp_v6_add_protocol(void)
1064{
1065 /* Register notifier for inet6 address additions/deletions. */
1066 register_inet6addr_notifier(&sctp_inet6addr_notifier);
1067
1068 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1069 return -EAGAIN;
1070
1071 return 0;
1072}
1073
1074/* Unregister with inet6 layer. */
1075void sctp_v6_del_protocol(void)
1076{
1077 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1078 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
1079}