blob: 2e266129a764d2f0dc0edfaabdf483155b8cfdb1 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* SCTP kernel reference 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 reference Implementation
8 *
9 * SCTP over IPv6.
10 *
11 * The SCTP reference 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 * The SCTP reference 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#include <linux/module.h>
51#include <linux/errno.h>
52#include <linux/types.h>
53#include <linux/socket.h>
54#include <linux/sockios.h>
55#include <linux/net.h>
56#include <linux/sched.h>
57#include <linux/in.h>
58#include <linux/in6.h>
59#include <linux/netdevice.h>
60#include <linux/init.h>
61#include <linux/ipsec.h>
62
63#include <linux/ipv6.h>
64#include <linux/icmpv6.h>
65#include <linux/random.h>
66#include <linux/seq_file.h>
67
68#include <net/protocol.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070069#include <net/ndisc.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070070#include <net/ip.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070071#include <net/ipv6.h>
72#include <net/transp_v6.h>
73#include <net/addrconf.h>
74#include <net/ip6_route.h>
75#include <net/inet_common.h>
76#include <net/inet_ecn.h>
77#include <net/sctp/sctp.h>
78
79#include <asm/uaccess.h>
80
81extern int sctp_inetaddr_event(struct notifier_block *, unsigned long, void *);
82static struct notifier_block sctp_inet6addr_notifier = {
83 .notifier_call = sctp_inetaddr_event,
84};
85
86/* ICMP error handler. */
87SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
88 int type, int code, int offset, __u32 info)
89{
90 struct inet6_dev *idev;
91 struct ipv6hdr *iph = (struct ipv6hdr *)skb->data;
92 struct sctphdr *sh = (struct sctphdr *)(skb->data + offset);
93 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 struct sctp_association *asoc;
95 struct sctp_transport *transport;
96 struct ipv6_pinfo *np;
97 char *saveip, *savesctp;
98 int err;
99
100 idev = in6_dev_get(skb->dev);
101
102 /* Fix up skb to look at the embedded net header. */
103 saveip = skb->nh.raw;
104 savesctp = skb->h.raw;
105 skb->nh.ipv6h = iph;
106 skb->h.raw = (char *)sh;
Sridhar Samudralad1ad1ff2005-07-18 13:44:10 -0700107 sk = sctp_err_lookup(AF_INET6, skb, sh, &asoc, &transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 /* Put back, the original pointers. */
109 skb->nh.raw = saveip;
110 skb->h.raw = savesctp;
111 if (!sk) {
112 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS);
113 goto out;
114 }
115
116 /* Warning: The sock lock is held. Remember to call
117 * sctp_err_finish!
118 */
119
120 switch (type) {
121 case ICMPV6_PKT_TOOBIG:
122 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
123 goto out_unlock;
124 case ICMPV6_PARAMPROB:
125 if (ICMPV6_UNK_NEXTHDR == code) {
Sridhar Samudralad1ad1ff2005-07-18 13:44:10 -0700126 sctp_icmp_proto_unreachable(sk, asoc, transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 goto out_unlock;
128 }
129 break;
130 default:
131 break;
132 }
133
134 np = inet6_sk(sk);
135 icmpv6_err_convert(type, code, &err);
136 if (!sock_owned_by_user(sk) && np->recverr) {
137 sk->sk_err = err;
138 sk->sk_error_report(sk);
139 } else { /* Only an error on timeout */
140 sk->sk_err_soft = err;
141 }
142
143out_unlock:
Sridhar Samudralad1ad1ff2005-07-18 13:44:10 -0700144 sctp_err_finish(sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145out:
146 if (likely(idev != NULL))
147 in6_dev_put(idev);
148}
149
150/* Based on tcp_v6_xmit() in tcp_ipv6.c. */
151static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport,
152 int ipfragok)
153{
154 struct sock *sk = skb->sk;
155 struct ipv6_pinfo *np = inet6_sk(sk);
156 struct flowi fl;
157
158 memset(&fl, 0, sizeof(fl));
159
160 fl.proto = sk->sk_protocol;
161
162 /* Fill in the dest address from the route entry passed with the skb
163 * and the source address from the transport.
164 */
165 ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr);
166 ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr);
167
168 fl.fl6_flowlabel = np->flow_label;
169 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
170 if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL)
171 fl.oif = transport->saddr.v6.sin6_scope_id;
172 else
173 fl.oif = sk->sk_bound_dev_if;
174 fl.fl_ip_sport = inet_sk(sk)->sport;
175 fl.fl_ip_dport = transport->ipaddr.v6.sin6_port;
176
177 if (np->opt && np->opt->srcrt) {
178 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
179 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
180 }
181
182 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
Joe Perches46b86a22006-01-13 14:29:07 -0800183 "src:" NIP6_FMT " dst:" NIP6_FMT "\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 __FUNCTION__, skb, skb->len,
185 NIP6(fl.fl6_src), NIP6(fl.fl6_dst));
186
187 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
188
189 return ip6_xmit(sk, skb, &fl, np->opt, ipfragok);
190}
191
192/* Returns the dst cache entry for the given source and destination ip
193 * addresses.
194 */
195static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
196 union sctp_addr *daddr,
197 union sctp_addr *saddr)
198{
199 struct dst_entry *dst;
200 struct flowi fl;
201
202 memset(&fl, 0, sizeof(fl));
203 ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr);
204 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
205 fl.oif = daddr->v6.sin6_scope_id;
206
207
Joe Perches46b86a22006-01-13 14:29:07 -0800208 SCTP_DEBUG_PRINTK("%s: DST=" NIP6_FMT " ",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 __FUNCTION__, NIP6(fl.fl6_dst));
210
211 if (saddr) {
212 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr);
213 SCTP_DEBUG_PRINTK(
Joe Perches46b86a22006-01-13 14:29:07 -0800214 "SRC=" NIP6_FMT " - ",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 NIP6(fl.fl6_src));
216 }
217
218 dst = ip6_route_output(NULL, &fl);
219 if (dst) {
220 struct rt6_info *rt;
221 rt = (struct rt6_info *)dst;
222 SCTP_DEBUG_PRINTK(
Joe Perches46b86a22006-01-13 14:29:07 -0800223 "rt6_dst:" NIP6_FMT " rt6_src:" NIP6_FMT "\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr));
225 } else {
226 SCTP_DEBUG_PRINTK("NO ROUTE\n");
227 }
228
229 return dst;
230}
231
232/* Returns the number of consecutive initial bits that match in the 2 ipv6
233 * addresses.
234 */
235static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
236 union sctp_addr *s2)
237{
238 struct in6_addr *a1 = &s1->v6.sin6_addr;
239 struct in6_addr *a2 = &s2->v6.sin6_addr;
240 int i, j;
241
242 for (i = 0; i < 4 ; i++) {
243 __u32 a1xora2;
244
245 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i];
246
247 if ((j = fls(ntohl(a1xora2))))
248 return (i * 32 + 32 - j);
249 }
250
251 return (i*32);
252}
253
254/* Fills in the source address(saddr) based on the destination address(daddr)
255 * and asoc's bind address list.
256 */
257static void sctp_v6_get_saddr(struct sctp_association *asoc,
258 struct dst_entry *dst,
259 union sctp_addr *daddr,
260 union sctp_addr *saddr)
261{
262 struct sctp_bind_addr *bp;
263 rwlock_t *addr_lock;
264 struct sctp_sockaddr_entry *laddr;
265 struct list_head *pos;
266 sctp_scope_t scope;
267 union sctp_addr *baddr = NULL;
268 __u8 matchlen = 0;
269 __u8 bmatchlen;
270
271 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
Joe Perches46b86a22006-01-13 14:29:07 -0800272 "daddr:" NIP6_FMT " ",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr));
274
275 if (!asoc) {
276 ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr);
Joe Perches46b86a22006-01-13 14:29:07 -0800277 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT "\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 NIP6(saddr->v6.sin6_addr));
279 return;
280 }
281
282 scope = sctp_scope(daddr);
283
284 bp = &asoc->base.bind_addr;
285 addr_lock = &asoc->base.addr_lock;
286
287 /* Go through the bind address list and find the best source address
288 * that matches the scope of the destination address.
289 */
290 sctp_read_lock(addr_lock);
291 list_for_each(pos, &bp->address_list) {
292 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
293 if ((laddr->a.sa.sa_family == AF_INET6) &&
294 (scope <= sctp_scope(&laddr->a))) {
295 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
296 if (!baddr || (matchlen < bmatchlen)) {
297 baddr = &laddr->a;
298 matchlen = bmatchlen;
299 }
300 }
301 }
302
303 if (baddr) {
304 memcpy(saddr, baddr, sizeof(union sctp_addr));
Joe Perches46b86a22006-01-13 14:29:07 -0800305 SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT "\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 NIP6(saddr->v6.sin6_addr));
307 } else {
308 printk(KERN_ERR "%s: asoc:%p Could not find a valid source "
Joe Perches46b86a22006-01-13 14:29:07 -0800309 "address for the dest:" NIP6_FMT "\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr));
311 }
312
313 sctp_read_unlock(addr_lock);
314}
315
316/* Make a copy of all potential local addresses. */
317static void sctp_v6_copy_addrlist(struct list_head *addrlist,
318 struct net_device *dev)
319{
320 struct inet6_dev *in6_dev;
321 struct inet6_ifaddr *ifp;
322 struct sctp_sockaddr_entry *addr;
323
324 read_lock(&addrconf_lock);
325 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
326 read_unlock(&addrconf_lock);
327 return;
328 }
329
330 read_lock(&in6_dev->lock);
331 for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) {
332 /* Add the address to the local list. */
333 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
334 if (addr) {
335 addr->a.v6.sin6_family = AF_INET6;
336 addr->a.v6.sin6_port = 0;
337 addr->a.v6.sin6_addr = ifp->addr;
338 addr->a.v6.sin6_scope_id = dev->ifindex;
339 INIT_LIST_HEAD(&addr->list);
340 list_add_tail(&addr->list, addrlist);
341 }
342 }
343
344 read_unlock(&in6_dev->lock);
345 read_unlock(&addrconf_lock);
346}
347
348/* Initialize a sockaddr_storage from in incoming skb. */
349static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
350 int is_saddr)
351{
352 void *from;
353 __u16 *port;
354 struct sctphdr *sh;
355
356 port = &addr->v6.sin6_port;
357 addr->v6.sin6_family = AF_INET6;
358 addr->v6.sin6_flowinfo = 0; /* FIXME */
359 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
360
361 sh = (struct sctphdr *) skb->h.raw;
362 if (is_saddr) {
363 *port = ntohs(sh->source);
364 from = &skb->nh.ipv6h->saddr;
365 } else {
366 *port = ntohs(sh->dest);
367 from = &skb->nh.ipv6h->daddr;
368 }
369 ipv6_addr_copy(&addr->v6.sin6_addr, from);
370}
371
372/* Initialize an sctp_addr from a socket. */
373static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
374{
375 addr->v6.sin6_family = AF_INET6;
376 addr->v6.sin6_port = inet_sk(sk)->num;
377 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
378}
379
380/* Initialize sk->sk_rcv_saddr from sctp_addr. */
381static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
382{
383 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
384 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
385 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
386 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
387 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
388 addr->v4.sin_addr.s_addr;
389 } else {
390 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
391 }
392}
393
394/* Initialize sk->sk_daddr from sctp_addr. */
395static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
396{
397 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
398 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
399 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
400 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
401 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
402 } else {
403 inet6_sk(sk)->daddr = addr->v6.sin6_addr;
404 }
405}
406
407/* Initialize a sctp_addr from an address parameter. */
408static void sctp_v6_from_addr_param(union sctp_addr *addr,
409 union sctp_addr_param *param,
410 __u16 port, int iif)
411{
412 addr->v6.sin6_family = AF_INET6;
413 addr->v6.sin6_port = port;
414 addr->v6.sin6_flowinfo = 0; /* BUG */
415 ipv6_addr_copy(&addr->v6.sin6_addr, &param->v6.addr);
416 addr->v6.sin6_scope_id = iif;
417}
418
419/* Initialize an address parameter from a sctp_addr and return the length
420 * of the address parameter.
421 */
422static int sctp_v6_to_addr_param(const union sctp_addr *addr,
423 union sctp_addr_param *param)
424{
425 int length = sizeof(sctp_ipv6addr_param_t);
426
427 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
428 param->v6.param_hdr.length = ntohs(length);
429 ipv6_addr_copy(&param->v6.addr, &addr->v6.sin6_addr);
430
431 return length;
432}
433
434/* Initialize a sctp_addr from a dst_entry. */
435static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst,
436 unsigned short port)
437{
438 struct rt6_info *rt = (struct rt6_info *)dst;
439 addr->sa.sa_family = AF_INET6;
440 addr->v6.sin6_port = port;
441 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr);
442}
443
444/* Compare addresses exactly.
445 * v4-mapped-v6 is also in consideration.
446 */
447static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
448 const union sctp_addr *addr2)
449{
450 if (addr1->sa.sa_family != addr2->sa.sa_family) {
451 if (addr1->sa.sa_family == AF_INET &&
452 addr2->sa.sa_family == AF_INET6 &&
453 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) {
454 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
455 addr2->v6.sin6_addr.s6_addr32[3] ==
456 addr1->v4.sin_addr.s_addr)
457 return 1;
458 }
459 if (addr2->sa.sa_family == AF_INET &&
460 addr1->sa.sa_family == AF_INET6 &&
461 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) {
462 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
463 addr1->v6.sin6_addr.s6_addr32[3] ==
464 addr2->v4.sin_addr.s_addr)
465 return 1;
466 }
467 return 0;
468 }
469 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
470 return 0;
471 /* If this is a linklocal address, compare the scope_id. */
472 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
473 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
474 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
475 return 0;
476 }
477 }
478
479 return 1;
480}
481
482/* Initialize addr struct to INADDR_ANY. */
483static void sctp_v6_inaddr_any(union sctp_addr *addr, unsigned short port)
484{
485 memset(addr, 0x00, sizeof(union sctp_addr));
486 addr->v6.sin6_family = AF_INET6;
487 addr->v6.sin6_port = port;
488}
489
490/* Is this a wildcard address? */
491static int sctp_v6_is_any(const union sctp_addr *addr)
492{
Brian Haleyb9b9e102005-04-28 11:59:16 -0700493 return ipv6_addr_any(&addr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494}
495
496/* Should this be available for binding? */
497static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
498{
499 int type;
500 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr;
501
502 type = ipv6_addr_type(in6);
503 if (IPV6_ADDR_ANY == type)
504 return 1;
505 if (type == IPV6_ADDR_MAPPED) {
506 if (sp && !sp->v4mapped)
507 return 0;
508 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
509 return 0;
510 sctp_v6_map_v4(addr);
511 return sctp_get_af_specific(AF_INET)->available(addr, sp);
512 }
513 if (!(type & IPV6_ADDR_UNICAST))
514 return 0;
515
516 return ipv6_chk_addr(in6, NULL, 0);
517}
518
519/* This function checks if the address is a valid address to be used for
520 * SCTP.
521 *
522 * Output:
523 * Return 0 - If the address is a non-unicast or an illegal address.
524 * Return 1 - If the address is a unicast.
525 */
526static int sctp_v6_addr_valid(union sctp_addr *addr, struct sctp_sock *sp)
527{
528 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
529
530 /* Support v4-mapped-v6 address. */
531 if (ret == IPV6_ADDR_MAPPED) {
532 /* Note: This routine is used in input, so v4-mapped-v6
533 * are disallowed here when there is no sctp_sock.
534 */
535 if (!sp || !sp->v4mapped)
536 return 0;
537 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
538 return 0;
539 sctp_v6_map_v4(addr);
540 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp);
541 }
542
543 /* Is this a non-unicast address */
544 if (!(ret & IPV6_ADDR_UNICAST))
545 return 0;
546
547 return 1;
548}
549
550/* What is the scope of 'addr'? */
551static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
552{
553 int v6scope;
554 sctp_scope_t retval;
555
556 /* The IPv6 scope is really a set of bit fields.
557 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
558 */
559
560 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
561 switch (v6scope) {
562 case IFA_HOST:
563 retval = SCTP_SCOPE_LOOPBACK;
564 break;
565 case IFA_LINK:
566 retval = SCTP_SCOPE_LINK;
567 break;
568 case IFA_SITE:
569 retval = SCTP_SCOPE_PRIVATE;
570 break;
571 default:
572 retval = SCTP_SCOPE_GLOBAL;
573 break;
574 };
575
576 return retval;
577}
578
579/* Create and initialize a new sk for the socket to be returned by accept(). */
580static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
581 struct sctp_association *asoc)
582{
583 struct inet_sock *inet = inet_sk(sk);
584 struct sock *newsk;
585 struct inet_sock *newinet;
586 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
587 struct sctp6_sock *newsctp6sk;
588
589 newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot, 1);
590 if (!newsk)
591 goto out;
592
593 sock_init_data(NULL, newsk);
594
595 newsk->sk_type = SOCK_STREAM;
596
597 newsk->sk_prot = sk->sk_prot;
598 newsk->sk_no_check = sk->sk_no_check;
599 newsk->sk_reuse = sk->sk_reuse;
600
601 newsk->sk_destruct = inet_sock_destruct;
602 newsk->sk_family = PF_INET6;
603 newsk->sk_protocol = IPPROTO_SCTP;
604 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
605 newsk->sk_shutdown = sk->sk_shutdown;
606 sock_reset_flag(sk, SOCK_ZAPPED);
607
608 newsctp6sk = (struct sctp6_sock *)newsk;
609 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
610
611 newinet = inet_sk(newsk);
612 newnp = inet6_sk(newsk);
613
614 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
615
616 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
617 * and getpeername().
618 */
619 newinet->sport = inet->sport;
620 newnp->saddr = np->saddr;
621 newnp->rcv_saddr = np->rcv_saddr;
622 newinet->dport = htons(asoc->peer.port);
623 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
624
625 /* Init the ipv4 part of the socket since we can have sockets
626 * using v6 API for ipv4.
627 */
628 newinet->uc_ttl = -1;
629 newinet->mc_loop = 1;
630 newinet->mc_ttl = 1;
631 newinet->mc_index = 0;
632 newinet->mc_list = NULL;
633
634 if (ipv4_config.no_pmtu_disc)
635 newinet->pmtudisc = IP_PMTUDISC_DONT;
636 else
637 newinet->pmtudisc = IP_PMTUDISC_WANT;
638
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700639 sk_refcnt_debug_inc(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640
641 if (newsk->sk_prot->init(newsk)) {
642 sk_common_release(newsk);
643 newsk = NULL;
644 }
645
646out:
647 return newsk;
648}
649
650/* Map v4 address to mapped v6 address */
651static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
652{
653 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
654 sctp_v4_map_v6(addr);
655}
656
657/* Where did this skb come from? */
658static int sctp_v6_skb_iif(const struct sk_buff *skb)
659{
660 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
661 return opt->iif;
662}
663
664/* Was this packet marked by Explicit Congestion Notification? */
665static int sctp_v6_is_ce(const struct sk_buff *skb)
666{
667 return *((__u32 *)(skb->nh.ipv6h)) & htonl(1<<20);
668}
669
670/* Dump the v6 addr to the seq file. */
671static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
672{
Joe Perches46b86a22006-01-13 14:29:07 -0800673 seq_printf(seq, NIP6_FMT " ", NIP6(addr->v6.sin6_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674}
675
676/* Initialize a PF_INET6 socket msg_name. */
677static void sctp_inet6_msgname(char *msgname, int *addr_len)
678{
679 struct sockaddr_in6 *sin6;
680
681 sin6 = (struct sockaddr_in6 *)msgname;
682 sin6->sin6_family = AF_INET6;
683 sin6->sin6_flowinfo = 0;
684 sin6->sin6_scope_id = 0; /*FIXME */
685 *addr_len = sizeof(struct sockaddr_in6);
686}
687
688/* Initialize a PF_INET msgname from a ulpevent. */
689static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
690 char *msgname, int *addrlen)
691{
692 struct sockaddr_in6 *sin6, *sin6from;
693
694 if (msgname) {
695 union sctp_addr *addr;
696 struct sctp_association *asoc;
697
698 asoc = event->asoc;
699 sctp_inet6_msgname(msgname, addrlen);
700 sin6 = (struct sockaddr_in6 *)msgname;
701 sin6->sin6_port = htons(asoc->peer.port);
702 addr = &asoc->peer.primary_addr;
703
704 /* Note: If we go to a common v6 format, this code
705 * will change.
706 */
707
708 /* Map ipv4 address into v4-mapped-on-v6 address. */
709 if (sctp_sk(asoc->base.sk)->v4mapped &&
710 AF_INET == addr->sa.sa_family) {
711 sctp_v4_map_v6((union sctp_addr *)sin6);
712 sin6->sin6_addr.s6_addr32[3] =
713 addr->v4.sin_addr.s_addr;
714 return;
715 }
716
717 sin6from = &asoc->peer.primary_addr.v6;
718 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
719 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
720 sin6->sin6_scope_id = sin6from->sin6_scope_id;
721 }
722}
723
724/* Initialize a msg_name from an inbound skb. */
725static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
726 int *addr_len)
727{
728 struct sctphdr *sh;
729 struct sockaddr_in6 *sin6;
730
731 if (msgname) {
732 sctp_inet6_msgname(msgname, addr_len);
733 sin6 = (struct sockaddr_in6 *)msgname;
734 sh = (struct sctphdr *)skb->h.raw;
735 sin6->sin6_port = sh->source;
736
737 /* Map ipv4 address into v4-mapped-on-v6 address. */
738 if (sctp_sk(skb->sk)->v4mapped &&
739 skb->nh.iph->version == 4) {
740 sctp_v4_map_v6((union sctp_addr *)sin6);
741 sin6->sin6_addr.s6_addr32[3] = skb->nh.iph->saddr;
742 return;
743 }
744
745 /* Otherwise, just copy the v6 address. */
746 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
747 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
748 struct sctp_ulpevent *ev = sctp_skb2event(skb);
749 sin6->sin6_scope_id = ev->iif;
750 }
751 }
752}
753
754/* Do we support this AF? */
755static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
756{
757 switch (family) {
758 case AF_INET6:
759 return 1;
760 /* v4-mapped-v6 addresses */
761 case AF_INET:
762 if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped)
763 return 1;
764 default:
765 return 0;
766 }
767}
768
769/* Address matching with wildcards allowed. This extra level
770 * of indirection lets us choose whether a PF_INET6 should
771 * disallow any v4 addresses if we so choose.
772 */
773static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
774 const union sctp_addr *addr2,
775 struct sctp_sock *opt)
776{
777 struct sctp_af *af1, *af2;
778
779 af1 = sctp_get_af_specific(addr1->sa.sa_family);
780 af2 = sctp_get_af_specific(addr2->sa.sa_family);
781
782 if (!af1 || !af2)
783 return 0;
784 /* Today, wildcard AF_INET/AF_INET6. */
785 if (sctp_is_any(addr1) || sctp_is_any(addr2))
786 return 1;
787
788 if (addr1->sa.sa_family != addr2->sa.sa_family)
789 return 0;
790
791 return af1->cmp_addr(addr1, addr2);
792}
793
794/* Verify that the provided sockaddr looks bindable. Common verification,
795 * has already been taken care of.
796 */
797static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
798{
799 struct sctp_af *af;
800
801 /* ASSERT: address family has already been verified. */
802 if (addr->sa.sa_family != AF_INET6)
803 af = sctp_get_af_specific(addr->sa.sa_family);
804 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 int type = ipv6_addr_type(&addr->v6.sin6_addr);
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700806 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700808 if (type & IPV6_ADDR_LINKLOCAL) {
809 if (!addr->v6.sin6_scope_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 return 0;
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700811 dev = dev_get_by_index(addr->v6.sin6_scope_id);
812 if (!dev)
813 return 0;
814 dev_put(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 }
816 af = opt->pf->af;
817 }
818 return af->available(addr, opt);
819}
820
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700821/* Verify that the provided sockaddr looks sendable. Common verification,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 * has already been taken care of.
823 */
824static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
825{
826 struct sctp_af *af = NULL;
827
828 /* ASSERT: address family has already been verified. */
829 if (addr->sa.sa_family != AF_INET6)
830 af = sctp_get_af_specific(addr->sa.sa_family);
831 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 int type = ipv6_addr_type(&addr->v6.sin6_addr);
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700833 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700835 if (type & IPV6_ADDR_LINKLOCAL) {
836 if (!addr->v6.sin6_scope_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 return 0;
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700838 dev = dev_get_by_index(addr->v6.sin6_scope_id);
839 if (!dev)
840 return 0;
841 dev_put(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 }
843 af = opt->pf->af;
844 }
845
846 return af != NULL;
847}
848
849/* Fill in Supported Address Type information for INIT and INIT-ACK
850 * chunks. Note: In the future, we may want to look at sock options
851 * to determine whether a PF_INET6 socket really wants to have IPV4
852 * addresses.
853 * Returns number of addresses supported.
854 */
855static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
856 __u16 *types)
857{
858 types[0] = SCTP_PARAM_IPV4_ADDRESS;
859 types[1] = SCTP_PARAM_IPV6_ADDRESS;
860 return 2;
861}
862
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800863static const struct proto_ops inet6_seqpacket_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 .family = PF_INET6,
865 .owner = THIS_MODULE,
866 .release = inet6_release,
867 .bind = inet6_bind,
868 .connect = inet_dgram_connect,
869 .socketpair = sock_no_socketpair,
870 .accept = inet_accept,
871 .getname = inet6_getname,
872 .poll = sctp_poll,
873 .ioctl = inet6_ioctl,
874 .listen = sctp_inet_listen,
875 .shutdown = inet_shutdown,
876 .setsockopt = sock_common_setsockopt,
877 .getsockopt = sock_common_getsockopt,
878 .sendmsg = inet_sendmsg,
879 .recvmsg = sock_common_recvmsg,
880 .mmap = sock_no_mmap,
881};
882
883static struct inet_protosw sctpv6_seqpacket_protosw = {
884 .type = SOCK_SEQPACKET,
885 .protocol = IPPROTO_SCTP,
886 .prot = &sctpv6_prot,
887 .ops = &inet6_seqpacket_ops,
888 .capability = -1,
889 .no_check = 0,
890 .flags = SCTP_PROTOSW_FLAG
891};
892static struct inet_protosw sctpv6_stream_protosw = {
893 .type = SOCK_STREAM,
894 .protocol = IPPROTO_SCTP,
895 .prot = &sctpv6_prot,
896 .ops = &inet6_seqpacket_ops,
897 .capability = -1,
898 .no_check = 0,
899 .flags = SCTP_PROTOSW_FLAG,
900};
901
Patrick McHardy951dbc82006-01-06 23:02:34 -0800902static int sctp6_rcv(struct sk_buff **pskb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903{
904 return sctp_rcv(*pskb) ? -1 : 0;
905}
906
907static struct inet6_protocol sctpv6_protocol = {
908 .handler = sctp6_rcv,
909 .err_handler = sctp_v6_err,
910 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
911};
912
913static struct sctp_af sctp_ipv6_specific = {
914 .sctp_xmit = sctp_v6_xmit,
915 .setsockopt = ipv6_setsockopt,
916 .getsockopt = ipv6_getsockopt,
917 .get_dst = sctp_v6_get_dst,
918 .get_saddr = sctp_v6_get_saddr,
919 .copy_addrlist = sctp_v6_copy_addrlist,
920 .from_skb = sctp_v6_from_skb,
921 .from_sk = sctp_v6_from_sk,
922 .to_sk_saddr = sctp_v6_to_sk_saddr,
923 .to_sk_daddr = sctp_v6_to_sk_daddr,
924 .from_addr_param = sctp_v6_from_addr_param,
925 .to_addr_param = sctp_v6_to_addr_param,
926 .dst_saddr = sctp_v6_dst_saddr,
927 .cmp_addr = sctp_v6_cmp_addr,
928 .scope = sctp_v6_scope,
929 .addr_valid = sctp_v6_addr_valid,
930 .inaddr_any = sctp_v6_inaddr_any,
931 .is_any = sctp_v6_is_any,
932 .available = sctp_v6_available,
933 .skb_iif = sctp_v6_skb_iif,
934 .is_ce = sctp_v6_is_ce,
935 .seq_dump_addr = sctp_v6_seq_dump_addr,
936 .net_header_len = sizeof(struct ipv6hdr),
937 .sockaddr_len = sizeof(struct sockaddr_in6),
938 .sa_family = AF_INET6,
939};
940
941static struct sctp_pf sctp_pf_inet6_specific = {
942 .event_msgname = sctp_inet6_event_msgname,
943 .skb_msgname = sctp_inet6_skb_msgname,
944 .af_supported = sctp_inet6_af_supported,
945 .cmp_addr = sctp_inet6_cmp_addr,
946 .bind_verify = sctp_inet6_bind_verify,
947 .send_verify = sctp_inet6_send_verify,
948 .supported_addrs = sctp_inet6_supported_addrs,
949 .create_accept_sk = sctp_v6_create_accept_sk,
950 .addr_v4map = sctp_v6_addr_v4map,
951 .af = &sctp_ipv6_specific,
952};
953
954/* Initialize IPv6 support and register with inet6 stack. */
955int sctp_v6_init(void)
956{
957 int rc = proto_register(&sctpv6_prot, 1);
958
959 if (rc)
960 goto out;
961 /* Register inet6 protocol. */
962 rc = -EAGAIN;
963 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
964 goto out_unregister_sctp_proto;
965
966 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
967 inet6_register_protosw(&sctpv6_seqpacket_protosw);
968 inet6_register_protosw(&sctpv6_stream_protosw);
969
970 /* Register the SCTP specific PF_INET6 functions. */
971 sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6);
972
973 /* Register the SCTP specific AF_INET6 functions. */
974 sctp_register_af(&sctp_ipv6_specific);
975
976 /* Register notifier for inet6 address additions/deletions. */
977 register_inet6addr_notifier(&sctp_inet6addr_notifier);
978 rc = 0;
979out:
980 return rc;
981out_unregister_sctp_proto:
982 proto_unregister(&sctpv6_prot);
983 goto out;
984}
985
986/* IPv6 specific exit support. */
987void sctp_v6_exit(void)
988{
989 list_del(&sctp_ipv6_specific.list);
990 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
991 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
992 inet6_unregister_protosw(&sctpv6_stream_protosw);
993 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
994 proto_unregister(&sctpv6_prot);
995}