[NETFILTER]: nf_nat_sip: translate all Contact headers
[linux-2.6/sactl.git] / net / sctp / ipv6.c
blob036bfcc8d15b748d6b0f242f7cc35a920eadfeb3
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.
7 * This file is part of the SCTP kernel implementation
9 * SCTP over IPv6.
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.
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.
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.
28 * Please send any bug reports or fixes you make to the
29 * email address(es):
30 * lksctp developers <lksctp-developers@lists.sourceforge.net>
32 * Or submit a bug report through the following website:
33 * http://www.sf.net/projects/lksctp
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>
43 * Based on:
44 * linux/net/ipv6/tcp_ipv6.c
46 * Any bugs reported given to us we will try to fix... any fixes shared will
47 * be incorporated into the next SCTP release.
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/in.h>
57 #include <linux/in6.h>
58 #include <linux/netdevice.h>
59 #include <linux/init.h>
60 #include <linux/ipsec.h>
62 #include <linux/ipv6.h>
63 #include <linux/icmpv6.h>
64 #include <linux/random.h>
65 #include <linux/seq_file.h>
67 #include <net/protocol.h>
68 #include <net/ndisc.h>
69 #include <net/ip.h>
70 #include <net/ipv6.h>
71 #include <net/transp_v6.h>
72 #include <net/addrconf.h>
73 #include <net/ip6_route.h>
74 #include <net/inet_common.h>
75 #include <net/inet_ecn.h>
76 #include <net/sctp/sctp.h>
78 #include <asm/uaccess.h>
80 /* Event handler for inet6 address addition/deletion events.
81 * The sctp_local_addr_list needs to be protocted by a spin lock since
82 * multiple notifiers (say IPv4 and IPv6) may be running at the same
83 * time and thus corrupt the list.
84 * The reader side is protected with RCU.
86 static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
87 void *ptr)
89 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
90 struct sctp_sockaddr_entry *addr = NULL;
91 struct sctp_sockaddr_entry *temp;
92 int found = 0;
94 switch (ev) {
95 case NETDEV_UP:
96 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
97 if (addr) {
98 addr->a.v6.sin6_family = AF_INET6;
99 addr->a.v6.sin6_port = 0;
100 memcpy(&addr->a.v6.sin6_addr, &ifa->addr,
101 sizeof(struct in6_addr));
102 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
103 addr->valid = 1;
104 spin_lock_bh(&sctp_local_addr_lock);
105 list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
106 spin_unlock_bh(&sctp_local_addr_lock);
108 break;
109 case NETDEV_DOWN:
110 spin_lock_bh(&sctp_local_addr_lock);
111 list_for_each_entry_safe(addr, temp,
112 &sctp_local_addr_list, list) {
113 if (ipv6_addr_equal(&addr->a.v6.sin6_addr,
114 &ifa->addr)) {
115 found = 1;
116 addr->valid = 0;
117 list_del_rcu(&addr->list);
118 break;
121 spin_unlock_bh(&sctp_local_addr_lock);
122 if (found)
123 call_rcu(&addr->rcu, sctp_local_addr_free);
124 break;
127 return NOTIFY_DONE;
130 static struct notifier_block sctp_inet6addr_notifier = {
131 .notifier_call = sctp_inet6addr_event,
134 /* ICMP error handler. */
135 SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
136 int type, int code, int offset, __be32 info)
138 struct inet6_dev *idev;
139 struct sock *sk;
140 struct sctp_association *asoc;
141 struct sctp_transport *transport;
142 struct ipv6_pinfo *np;
143 sk_buff_data_t saveip, savesctp;
144 int err;
146 idev = in6_dev_get(skb->dev);
148 /* Fix up skb to look at the embedded net header. */
149 saveip = skb->network_header;
150 savesctp = skb->transport_header;
151 skb_reset_network_header(skb);
152 skb_set_transport_header(skb, offset);
153 sk = sctp_err_lookup(AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
154 /* Put back, the original pointers. */
155 skb->network_header = saveip;
156 skb->transport_header = savesctp;
157 if (!sk) {
158 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS);
159 goto out;
162 /* Warning: The sock lock is held. Remember to call
163 * sctp_err_finish!
166 switch (type) {
167 case ICMPV6_PKT_TOOBIG:
168 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
169 goto out_unlock;
170 case ICMPV6_PARAMPROB:
171 if (ICMPV6_UNK_NEXTHDR == code) {
172 sctp_icmp_proto_unreachable(sk, asoc, transport);
173 goto out_unlock;
175 break;
176 default:
177 break;
180 np = inet6_sk(sk);
181 icmpv6_err_convert(type, code, &err);
182 if (!sock_owned_by_user(sk) && np->recverr) {
183 sk->sk_err = err;
184 sk->sk_error_report(sk);
185 } else { /* Only an error on timeout */
186 sk->sk_err_soft = err;
189 out_unlock:
190 sctp_err_finish(sk, asoc);
191 out:
192 if (likely(idev != NULL))
193 in6_dev_put(idev);
196 /* Based on tcp_v6_xmit() in tcp_ipv6.c. */
197 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport,
198 int ipfragok)
200 struct sock *sk = skb->sk;
201 struct ipv6_pinfo *np = inet6_sk(sk);
202 struct flowi fl;
204 memset(&fl, 0, sizeof(fl));
206 fl.proto = sk->sk_protocol;
208 /* Fill in the dest address from the route entry passed with the skb
209 * and the source address from the transport.
211 ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr);
212 ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr);
214 fl.fl6_flowlabel = np->flow_label;
215 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
216 if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL)
217 fl.oif = transport->saddr.v6.sin6_scope_id;
218 else
219 fl.oif = sk->sk_bound_dev_if;
221 if (np->opt && np->opt->srcrt) {
222 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
223 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
226 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
227 "src:" NIP6_FMT " dst:" NIP6_FMT "\n",
228 __func__, skb, skb->len,
229 NIP6(fl.fl6_src), NIP6(fl.fl6_dst));
231 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
233 return ip6_xmit(sk, skb, &fl, np->opt, ipfragok);
236 /* Returns the dst cache entry for the given source and destination ip
237 * addresses.
239 static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
240 union sctp_addr *daddr,
241 union sctp_addr *saddr)
243 struct dst_entry *dst;
244 struct flowi fl;
246 memset(&fl, 0, sizeof(fl));
247 ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr);
248 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
249 fl.oif = daddr->v6.sin6_scope_id;
252 SCTP_DEBUG_PRINTK("%s: DST=" NIP6_FMT " ",
253 __func__, NIP6(fl.fl6_dst));
255 if (saddr) {
256 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr);
257 SCTP_DEBUG_PRINTK(
258 "SRC=" NIP6_FMT " - ",
259 NIP6(fl.fl6_src));
262 dst = ip6_route_output(&init_net, NULL, &fl);
263 if (!dst->error) {
264 struct rt6_info *rt;
265 rt = (struct rt6_info *)dst;
266 SCTP_DEBUG_PRINTK(
267 "rt6_dst:" NIP6_FMT " rt6_src:" NIP6_FMT "\n",
268 NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr));
269 return dst;
271 SCTP_DEBUG_PRINTK("NO ROUTE\n");
272 dst_release(dst);
273 return NULL;
276 /* Returns the number of consecutive initial bits that match in the 2 ipv6
277 * addresses.
279 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
280 union sctp_addr *s2)
282 struct in6_addr *a1 = &s1->v6.sin6_addr;
283 struct in6_addr *a2 = &s2->v6.sin6_addr;
284 int i, j;
286 for (i = 0; i < 4 ; i++) {
287 __be32 a1xora2;
289 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i];
291 if ((j = fls(ntohl(a1xora2))))
292 return (i * 32 + 32 - j);
295 return (i*32);
298 /* Fills in the source address(saddr) based on the destination address(daddr)
299 * and asoc's bind address list.
301 static void sctp_v6_get_saddr(struct sctp_association *asoc,
302 struct dst_entry *dst,
303 union sctp_addr *daddr,
304 union sctp_addr *saddr)
306 struct sctp_bind_addr *bp;
307 struct sctp_sockaddr_entry *laddr;
308 sctp_scope_t scope;
309 union sctp_addr *baddr = NULL;
310 __u8 matchlen = 0;
311 __u8 bmatchlen;
313 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
314 "daddr:" NIP6_FMT " ",
315 __func__, asoc, dst, NIP6(daddr->v6.sin6_addr));
317 if (!asoc) {
318 ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL,
319 &daddr->v6.sin6_addr,
320 inet6_sk(asoc->base.sk)->srcprefs,
321 &saddr->v6.sin6_addr);
322 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT "\n",
323 NIP6(saddr->v6.sin6_addr));
324 return;
327 scope = sctp_scope(daddr);
329 bp = &asoc->base.bind_addr;
331 /* Go through the bind address list and find the best source address
332 * that matches the scope of the destination address.
334 rcu_read_lock();
335 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
336 if (!laddr->valid)
337 continue;
338 if ((laddr->state == SCTP_ADDR_SRC) &&
339 (laddr->a.sa.sa_family == AF_INET6) &&
340 (scope <= sctp_scope(&laddr->a))) {
341 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
342 if (!baddr || (matchlen < bmatchlen)) {
343 baddr = &laddr->a;
344 matchlen = bmatchlen;
349 if (baddr) {
350 memcpy(saddr, baddr, sizeof(union sctp_addr));
351 SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT "\n",
352 NIP6(saddr->v6.sin6_addr));
353 } else {
354 printk(KERN_ERR "%s: asoc:%p Could not find a valid source "
355 "address for the dest:" NIP6_FMT "\n",
356 __func__, asoc, NIP6(daddr->v6.sin6_addr));
359 rcu_read_unlock();
362 /* Make a copy of all potential local addresses. */
363 static void sctp_v6_copy_addrlist(struct list_head *addrlist,
364 struct net_device *dev)
366 struct inet6_dev *in6_dev;
367 struct inet6_ifaddr *ifp;
368 struct sctp_sockaddr_entry *addr;
370 rcu_read_lock();
371 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
372 rcu_read_unlock();
373 return;
376 read_lock_bh(&in6_dev->lock);
377 for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) {
378 /* Add the address to the local list. */
379 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
380 if (addr) {
381 addr->a.v6.sin6_family = AF_INET6;
382 addr->a.v6.sin6_port = 0;
383 addr->a.v6.sin6_addr = ifp->addr;
384 addr->a.v6.sin6_scope_id = dev->ifindex;
385 addr->valid = 1;
386 INIT_LIST_HEAD(&addr->list);
387 INIT_RCU_HEAD(&addr->rcu);
388 list_add_tail(&addr->list, addrlist);
392 read_unlock_bh(&in6_dev->lock);
393 rcu_read_unlock();
396 /* Initialize a sockaddr_storage from in incoming skb. */
397 static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
398 int is_saddr)
400 void *from;
401 __be16 *port;
402 struct sctphdr *sh;
404 port = &addr->v6.sin6_port;
405 addr->v6.sin6_family = AF_INET6;
406 addr->v6.sin6_flowinfo = 0; /* FIXME */
407 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
409 sh = sctp_hdr(skb);
410 if (is_saddr) {
411 *port = sh->source;
412 from = &ipv6_hdr(skb)->saddr;
413 } else {
414 *port = sh->dest;
415 from = &ipv6_hdr(skb)->daddr;
417 ipv6_addr_copy(&addr->v6.sin6_addr, from);
420 /* Initialize an sctp_addr from a socket. */
421 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
423 addr->v6.sin6_family = AF_INET6;
424 addr->v6.sin6_port = 0;
425 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
428 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
429 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
431 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
432 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
433 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
434 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
435 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
436 addr->v4.sin_addr.s_addr;
437 } else {
438 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
442 /* Initialize sk->sk_daddr from sctp_addr. */
443 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
445 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
446 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
447 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
448 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
449 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
450 } else {
451 inet6_sk(sk)->daddr = addr->v6.sin6_addr;
455 /* Initialize a sctp_addr from an address parameter. */
456 static void sctp_v6_from_addr_param(union sctp_addr *addr,
457 union sctp_addr_param *param,
458 __be16 port, int iif)
460 addr->v6.sin6_family = AF_INET6;
461 addr->v6.sin6_port = port;
462 addr->v6.sin6_flowinfo = 0; /* BUG */
463 ipv6_addr_copy(&addr->v6.sin6_addr, &param->v6.addr);
464 addr->v6.sin6_scope_id = iif;
467 /* Initialize an address parameter from a sctp_addr and return the length
468 * of the address parameter.
470 static int sctp_v6_to_addr_param(const union sctp_addr *addr,
471 union sctp_addr_param *param)
473 int length = sizeof(sctp_ipv6addr_param_t);
475 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
476 param->v6.param_hdr.length = htons(length);
477 ipv6_addr_copy(&param->v6.addr, &addr->v6.sin6_addr);
479 return length;
482 /* Initialize a sctp_addr from a dst_entry. */
483 static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst,
484 __be16 port)
486 struct rt6_info *rt = (struct rt6_info *)dst;
487 addr->sa.sa_family = AF_INET6;
488 addr->v6.sin6_port = port;
489 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr);
492 /* Compare addresses exactly.
493 * v4-mapped-v6 is also in consideration.
495 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
496 const union sctp_addr *addr2)
498 if (addr1->sa.sa_family != addr2->sa.sa_family) {
499 if (addr1->sa.sa_family == AF_INET &&
500 addr2->sa.sa_family == AF_INET6 &&
501 ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) {
502 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
503 addr2->v6.sin6_addr.s6_addr32[3] ==
504 addr1->v4.sin_addr.s_addr)
505 return 1;
507 if (addr2->sa.sa_family == AF_INET &&
508 addr1->sa.sa_family == AF_INET6 &&
509 ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) {
510 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
511 addr1->v6.sin6_addr.s6_addr32[3] ==
512 addr2->v4.sin_addr.s_addr)
513 return 1;
515 return 0;
517 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
518 return 0;
519 /* If this is a linklocal address, compare the scope_id. */
520 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
521 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
522 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
523 return 0;
527 return 1;
530 /* Initialize addr struct to INADDR_ANY. */
531 static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
533 memset(addr, 0x00, sizeof(union sctp_addr));
534 addr->v6.sin6_family = AF_INET6;
535 addr->v6.sin6_port = port;
538 /* Is this a wildcard address? */
539 static int sctp_v6_is_any(const union sctp_addr *addr)
541 return ipv6_addr_any(&addr->v6.sin6_addr);
544 /* Should this be available for binding? */
545 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
547 int type;
548 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr;
550 type = ipv6_addr_type(in6);
551 if (IPV6_ADDR_ANY == type)
552 return 1;
553 if (type == IPV6_ADDR_MAPPED) {
554 if (sp && !sp->v4mapped)
555 return 0;
556 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
557 return 0;
558 sctp_v6_map_v4(addr);
559 return sctp_get_af_specific(AF_INET)->available(addr, sp);
561 if (!(type & IPV6_ADDR_UNICAST))
562 return 0;
564 return ipv6_chk_addr(&init_net, in6, NULL, 0);
567 /* This function checks if the address is a valid address to be used for
568 * SCTP.
570 * Output:
571 * Return 0 - If the address is a non-unicast or an illegal address.
572 * Return 1 - If the address is a unicast.
574 static int sctp_v6_addr_valid(union sctp_addr *addr,
575 struct sctp_sock *sp,
576 const struct sk_buff *skb)
578 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
580 /* Support v4-mapped-v6 address. */
581 if (ret == IPV6_ADDR_MAPPED) {
582 /* Note: This routine is used in input, so v4-mapped-v6
583 * are disallowed here when there is no sctp_sock.
585 if (!sp || !sp->v4mapped)
586 return 0;
587 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
588 return 0;
589 sctp_v6_map_v4(addr);
590 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
593 /* Is this a non-unicast address */
594 if (!(ret & IPV6_ADDR_UNICAST))
595 return 0;
597 return 1;
600 /* What is the scope of 'addr'? */
601 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
603 int v6scope;
604 sctp_scope_t retval;
606 /* The IPv6 scope is really a set of bit fields.
607 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
610 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
611 switch (v6scope) {
612 case IFA_HOST:
613 retval = SCTP_SCOPE_LOOPBACK;
614 break;
615 case IFA_LINK:
616 retval = SCTP_SCOPE_LINK;
617 break;
618 case IFA_SITE:
619 retval = SCTP_SCOPE_PRIVATE;
620 break;
621 default:
622 retval = SCTP_SCOPE_GLOBAL;
623 break;
626 return retval;
629 /* Create and initialize a new sk for the socket to be returned by accept(). */
630 static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
631 struct sctp_association *asoc)
633 struct inet_sock *inet = inet_sk(sk);
634 struct sock *newsk;
635 struct inet_sock *newinet;
636 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
637 struct sctp6_sock *newsctp6sk;
639 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot);
640 if (!newsk)
641 goto out;
643 sock_init_data(NULL, newsk);
645 newsk->sk_type = SOCK_STREAM;
647 newsk->sk_prot = sk->sk_prot;
648 newsk->sk_no_check = sk->sk_no_check;
649 newsk->sk_reuse = sk->sk_reuse;
651 newsk->sk_destruct = inet_sock_destruct;
652 newsk->sk_family = PF_INET6;
653 newsk->sk_protocol = IPPROTO_SCTP;
654 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
655 newsk->sk_shutdown = sk->sk_shutdown;
656 sock_reset_flag(sk, SOCK_ZAPPED);
658 newsctp6sk = (struct sctp6_sock *)newsk;
659 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
661 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
663 newinet = inet_sk(newsk);
664 newnp = inet6_sk(newsk);
666 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
668 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
669 * and getpeername().
671 newinet->sport = inet->sport;
672 newnp->saddr = np->saddr;
673 newnp->rcv_saddr = np->rcv_saddr;
674 newinet->dport = htons(asoc->peer.port);
675 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
677 /* Init the ipv4 part of the socket since we can have sockets
678 * using v6 API for ipv4.
680 newinet->uc_ttl = -1;
681 newinet->mc_loop = 1;
682 newinet->mc_ttl = 1;
683 newinet->mc_index = 0;
684 newinet->mc_list = NULL;
686 if (ipv4_config.no_pmtu_disc)
687 newinet->pmtudisc = IP_PMTUDISC_DONT;
688 else
689 newinet->pmtudisc = IP_PMTUDISC_WANT;
691 sk_refcnt_debug_inc(newsk);
693 if (newsk->sk_prot->init(newsk)) {
694 sk_common_release(newsk);
695 newsk = NULL;
698 out:
699 return newsk;
702 /* Map v4 address to mapped v6 address */
703 static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
705 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
706 sctp_v4_map_v6(addr);
709 /* Where did this skb come from? */
710 static int sctp_v6_skb_iif(const struct sk_buff *skb)
712 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
713 return opt->iif;
716 /* Was this packet marked by Explicit Congestion Notification? */
717 static int sctp_v6_is_ce(const struct sk_buff *skb)
719 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
722 /* Dump the v6 addr to the seq file. */
723 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
725 seq_printf(seq, NIP6_FMT " ", NIP6(addr->v6.sin6_addr));
728 /* Initialize a PF_INET6 socket msg_name. */
729 static void sctp_inet6_msgname(char *msgname, int *addr_len)
731 struct sockaddr_in6 *sin6;
733 sin6 = (struct sockaddr_in6 *)msgname;
734 sin6->sin6_family = AF_INET6;
735 sin6->sin6_flowinfo = 0;
736 sin6->sin6_scope_id = 0; /*FIXME */
737 *addr_len = sizeof(struct sockaddr_in6);
740 /* Initialize a PF_INET msgname from a ulpevent. */
741 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
742 char *msgname, int *addrlen)
744 struct sockaddr_in6 *sin6, *sin6from;
746 if (msgname) {
747 union sctp_addr *addr;
748 struct sctp_association *asoc;
750 asoc = event->asoc;
751 sctp_inet6_msgname(msgname, addrlen);
752 sin6 = (struct sockaddr_in6 *)msgname;
753 sin6->sin6_port = htons(asoc->peer.port);
754 addr = &asoc->peer.primary_addr;
756 /* Note: If we go to a common v6 format, this code
757 * will change.
760 /* Map ipv4 address into v4-mapped-on-v6 address. */
761 if (sctp_sk(asoc->base.sk)->v4mapped &&
762 AF_INET == addr->sa.sa_family) {
763 sctp_v4_map_v6((union sctp_addr *)sin6);
764 sin6->sin6_addr.s6_addr32[3] =
765 addr->v4.sin_addr.s_addr;
766 return;
769 sin6from = &asoc->peer.primary_addr.v6;
770 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
771 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
772 sin6->sin6_scope_id = sin6from->sin6_scope_id;
776 /* Initialize a msg_name from an inbound skb. */
777 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
778 int *addr_len)
780 struct sctphdr *sh;
781 struct sockaddr_in6 *sin6;
783 if (msgname) {
784 sctp_inet6_msgname(msgname, addr_len);
785 sin6 = (struct sockaddr_in6 *)msgname;
786 sh = sctp_hdr(skb);
787 sin6->sin6_port = sh->source;
789 /* Map ipv4 address into v4-mapped-on-v6 address. */
790 if (sctp_sk(skb->sk)->v4mapped &&
791 ip_hdr(skb)->version == 4) {
792 sctp_v4_map_v6((union sctp_addr *)sin6);
793 sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr;
794 return;
797 /* Otherwise, just copy the v6 address. */
798 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
799 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
800 struct sctp_ulpevent *ev = sctp_skb2event(skb);
801 sin6->sin6_scope_id = ev->iif;
806 /* Do we support this AF? */
807 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
809 switch (family) {
810 case AF_INET6:
811 return 1;
812 /* v4-mapped-v6 addresses */
813 case AF_INET:
814 if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped)
815 return 1;
816 default:
817 return 0;
821 /* Address matching with wildcards allowed. This extra level
822 * of indirection lets us choose whether a PF_INET6 should
823 * disallow any v4 addresses if we so choose.
825 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
826 const union sctp_addr *addr2,
827 struct sctp_sock *opt)
829 struct sctp_af *af1, *af2;
831 af1 = sctp_get_af_specific(addr1->sa.sa_family);
832 af2 = sctp_get_af_specific(addr2->sa.sa_family);
834 if (!af1 || !af2)
835 return 0;
836 /* Today, wildcard AF_INET/AF_INET6. */
837 if (sctp_is_any(addr1) || sctp_is_any(addr2))
838 return 1;
840 if (addr1->sa.sa_family != addr2->sa.sa_family)
841 return 0;
843 return af1->cmp_addr(addr1, addr2);
846 /* Verify that the provided sockaddr looks bindable. Common verification,
847 * has already been taken care of.
849 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
851 struct sctp_af *af;
853 /* ASSERT: address family has already been verified. */
854 if (addr->sa.sa_family != AF_INET6)
855 af = sctp_get_af_specific(addr->sa.sa_family);
856 else {
857 int type = ipv6_addr_type(&addr->v6.sin6_addr);
858 struct net_device *dev;
860 if (type & IPV6_ADDR_LINKLOCAL) {
861 if (!addr->v6.sin6_scope_id)
862 return 0;
863 dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id);
864 if (!dev)
865 return 0;
866 if (!ipv6_chk_addr(&init_net, &addr->v6.sin6_addr,
867 dev, 0)) {
868 dev_put(dev);
869 return 0;
871 dev_put(dev);
873 af = opt->pf->af;
875 return af->available(addr, opt);
878 /* Verify that the provided sockaddr looks sendable. Common verification,
879 * has already been taken care of.
881 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
883 struct sctp_af *af = NULL;
885 /* ASSERT: address family has already been verified. */
886 if (addr->sa.sa_family != AF_INET6)
887 af = sctp_get_af_specific(addr->sa.sa_family);
888 else {
889 int type = ipv6_addr_type(&addr->v6.sin6_addr);
890 struct net_device *dev;
892 if (type & IPV6_ADDR_LINKLOCAL) {
893 if (!addr->v6.sin6_scope_id)
894 return 0;
895 dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id);
896 if (!dev)
897 return 0;
898 dev_put(dev);
900 af = opt->pf->af;
903 return af != NULL;
906 /* Fill in Supported Address Type information for INIT and INIT-ACK
907 * chunks. Note: In the future, we may want to look at sock options
908 * to determine whether a PF_INET6 socket really wants to have IPV4
909 * addresses.
910 * Returns number of addresses supported.
912 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
913 __be16 *types)
915 types[0] = SCTP_PARAM_IPV4_ADDRESS;
916 types[1] = SCTP_PARAM_IPV6_ADDRESS;
917 return 2;
920 static const struct proto_ops inet6_seqpacket_ops = {
921 .family = PF_INET6,
922 .owner = THIS_MODULE,
923 .release = inet6_release,
924 .bind = inet6_bind,
925 .connect = inet_dgram_connect,
926 .socketpair = sock_no_socketpair,
927 .accept = inet_accept,
928 .getname = inet6_getname,
929 .poll = sctp_poll,
930 .ioctl = inet6_ioctl,
931 .listen = sctp_inet_listen,
932 .shutdown = inet_shutdown,
933 .setsockopt = sock_common_setsockopt,
934 .getsockopt = sock_common_getsockopt,
935 .sendmsg = inet_sendmsg,
936 .recvmsg = sock_common_recvmsg,
937 .mmap = sock_no_mmap,
938 #ifdef CONFIG_COMPAT
939 .compat_setsockopt = compat_sock_common_setsockopt,
940 .compat_getsockopt = compat_sock_common_getsockopt,
941 #endif
944 static struct inet_protosw sctpv6_seqpacket_protosw = {
945 .type = SOCK_SEQPACKET,
946 .protocol = IPPROTO_SCTP,
947 .prot = &sctpv6_prot,
948 .ops = &inet6_seqpacket_ops,
949 .capability = -1,
950 .no_check = 0,
951 .flags = SCTP_PROTOSW_FLAG
953 static struct inet_protosw sctpv6_stream_protosw = {
954 .type = SOCK_STREAM,
955 .protocol = IPPROTO_SCTP,
956 .prot = &sctpv6_prot,
957 .ops = &inet6_seqpacket_ops,
958 .capability = -1,
959 .no_check = 0,
960 .flags = SCTP_PROTOSW_FLAG,
963 static int sctp6_rcv(struct sk_buff *skb)
965 return sctp_rcv(skb) ? -1 : 0;
968 static struct inet6_protocol sctpv6_protocol = {
969 .handler = sctp6_rcv,
970 .err_handler = sctp_v6_err,
971 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
974 static struct sctp_af sctp_af_inet6 = {
975 .sa_family = AF_INET6,
976 .sctp_xmit = sctp_v6_xmit,
977 .setsockopt = ipv6_setsockopt,
978 .getsockopt = ipv6_getsockopt,
979 .get_dst = sctp_v6_get_dst,
980 .get_saddr = sctp_v6_get_saddr,
981 .copy_addrlist = sctp_v6_copy_addrlist,
982 .from_skb = sctp_v6_from_skb,
983 .from_sk = sctp_v6_from_sk,
984 .to_sk_saddr = sctp_v6_to_sk_saddr,
985 .to_sk_daddr = sctp_v6_to_sk_daddr,
986 .from_addr_param = sctp_v6_from_addr_param,
987 .to_addr_param = sctp_v6_to_addr_param,
988 .dst_saddr = sctp_v6_dst_saddr,
989 .cmp_addr = sctp_v6_cmp_addr,
990 .scope = sctp_v6_scope,
991 .addr_valid = sctp_v6_addr_valid,
992 .inaddr_any = sctp_v6_inaddr_any,
993 .is_any = sctp_v6_is_any,
994 .available = sctp_v6_available,
995 .skb_iif = sctp_v6_skb_iif,
996 .is_ce = sctp_v6_is_ce,
997 .seq_dump_addr = sctp_v6_seq_dump_addr,
998 .net_header_len = sizeof(struct ipv6hdr),
999 .sockaddr_len = sizeof(struct sockaddr_in6),
1000 #ifdef CONFIG_COMPAT
1001 .compat_setsockopt = compat_ipv6_setsockopt,
1002 .compat_getsockopt = compat_ipv6_getsockopt,
1003 #endif
1006 static struct sctp_pf sctp_pf_inet6 = {
1007 .event_msgname = sctp_inet6_event_msgname,
1008 .skb_msgname = sctp_inet6_skb_msgname,
1009 .af_supported = sctp_inet6_af_supported,
1010 .cmp_addr = sctp_inet6_cmp_addr,
1011 .bind_verify = sctp_inet6_bind_verify,
1012 .send_verify = sctp_inet6_send_verify,
1013 .supported_addrs = sctp_inet6_supported_addrs,
1014 .create_accept_sk = sctp_v6_create_accept_sk,
1015 .addr_v4map = sctp_v6_addr_v4map,
1016 .af = &sctp_af_inet6,
1019 /* Initialize IPv6 support and register with socket layer. */
1020 void sctp_v6_pf_init(void)
1022 /* Register the SCTP specific PF_INET6 functions. */
1023 sctp_register_pf(&sctp_pf_inet6, PF_INET6);
1025 /* Register the SCTP specific AF_INET6 functions. */
1026 sctp_register_af(&sctp_af_inet6);
1029 void sctp_v6_pf_exit(void)
1031 list_del(&sctp_af_inet6.list);
1034 /* Initialize IPv6 support and register with socket layer. */
1035 int sctp_v6_protosw_init(void)
1037 int rc;
1039 rc = proto_register(&sctpv6_prot, 1);
1040 if (rc)
1041 return rc;
1043 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1044 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1045 inet6_register_protosw(&sctpv6_stream_protosw);
1047 return 0;
1050 void sctp_v6_protosw_exit(void)
1052 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1053 inet6_unregister_protosw(&sctpv6_stream_protosw);
1054 proto_unregister(&sctpv6_prot);
1058 /* Register with inet6 layer. */
1059 int sctp_v6_add_protocol(void)
1061 /* Register notifier for inet6 address additions/deletions. */
1062 register_inet6addr_notifier(&sctp_inet6addr_notifier);
1064 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1065 return -EAGAIN;
1067 return 0;
1070 /* Unregister with inet6 layer. */
1071 void sctp_v6_del_protocol(void)
1073 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1074 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);