1 /* 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.
7 * This file is part of the SCTP kernel reference Implementation
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)
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.
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
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>
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/sched.h>
58 #include <linux/in6.h>
59 #include <linux/netdevice.h>
60 #include <linux/init.h>
61 #include <linux/ipsec.h>
63 #include <linux/ipv6.h>
64 #include <linux/icmpv6.h>
65 #include <linux/random.h>
66 #include <linux/seq_file.h>
68 #include <net/protocol.h>
70 #include <net/ndisc.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>
79 #include <asm/uaccess.h>
81 extern int sctp_inetaddr_event(struct notifier_block *, unsigned long, void *);
82 static struct notifier_block sctp_inet6addr_notifier = {
83 .notifier_call = sctp_inetaddr_event,
86 /* ICMP error handler. */
87 void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
88 int type, int code, int offset, __u32 info)
90 struct inet6_dev *idev;
91 struct ipv6hdr *iph = (struct ipv6hdr *)skb->data;
92 struct sctphdr *sh = (struct sctphdr *)(skb->data + offset);
94 struct sctp_endpoint *ep;
95 struct sctp_association *asoc;
96 struct sctp_transport *transport;
97 struct ipv6_pinfo *np;
98 char *saveip, *savesctp;
101 idev = in6_dev_get(skb->dev);
103 /* Fix up skb to look at the embedded net header. */
104 saveip = skb->nh.raw;
105 savesctp = skb->h.raw;
107 skb->h.raw = (char *)sh;
108 sk = sctp_err_lookup(AF_INET6, skb, sh, &ep, &asoc, &transport);
109 /* Put back, the original pointers. */
110 skb->nh.raw = saveip;
111 skb->h.raw = savesctp;
113 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS);
117 /* Warning: The sock lock is held. Remember to call
122 case ICMPV6_PKT_TOOBIG:
123 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
130 icmpv6_err_convert(type, code, &err);
131 if (!sock_owned_by_user(sk) && np->recverr) {
133 sk->sk_error_report(sk);
134 } else { /* Only an error on timeout */
135 sk->sk_err_soft = err;
139 sctp_err_finish(sk, ep, asoc);
141 if (likely(idev != NULL))
145 /* Based on tcp_v6_xmit() in tcp_ipv6.c. */
146 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport,
149 struct sock *sk = skb->sk;
150 struct ipv6_pinfo *np = inet6_sk(sk);
153 memset(&fl, 0, sizeof(fl));
155 fl.proto = sk->sk_protocol;
157 /* Fill in the dest address from the route entry passed with the skb
158 * and the source address from the transport.
160 ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr);
161 ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr);
163 fl.fl6_flowlabel = np->flow_label;
164 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
165 if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL)
166 fl.oif = transport->saddr.v6.sin6_scope_id;
168 fl.oif = sk->sk_bound_dev_if;
169 fl.fl_ip_sport = inet_sk(sk)->sport;
170 fl.fl_ip_dport = transport->ipaddr.v6.sin6_port;
172 if (np->opt && np->opt->srcrt) {
173 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
174 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
177 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
178 "src:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
179 "dst:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
180 __FUNCTION__, skb, skb->len,
181 NIP6(fl.fl6_src), NIP6(fl.fl6_dst));
183 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
185 return ip6_xmit(sk, skb, &fl, np->opt, ipfragok);
188 /* Returns the dst cache entry for the given source and destination ip
191 struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
192 union sctp_addr *daddr,
193 union sctp_addr *saddr)
195 struct dst_entry *dst;
198 memset(&fl, 0, sizeof(fl));
199 ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr);
200 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
201 fl.oif = daddr->v6.sin6_scope_id;
204 SCTP_DEBUG_PRINTK("%s: DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
205 __FUNCTION__, NIP6(fl.fl6_dst));
208 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr);
210 "SRC=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x - ",
214 dst = ip6_route_output(NULL, &fl);
217 rt = (struct rt6_info *)dst;
219 "rt6_dst:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
220 "rt6_src:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
221 NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr));
223 SCTP_DEBUG_PRINTK("NO ROUTE\n");
229 /* Returns the number of consecutive initial bits that match in the 2 ipv6
232 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
235 struct in6_addr *a1 = &s1->v6.sin6_addr;
236 struct in6_addr *a2 = &s2->v6.sin6_addr;
239 for (i = 0; i < 4 ; i++) {
242 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i];
244 if ((j = fls(ntohl(a1xora2))))
245 return (i * 32 + 32 - j);
251 /* Fills in the source address(saddr) based on the destination address(daddr)
252 * and asoc's bind address list.
254 void sctp_v6_get_saddr(struct sctp_association *asoc, struct dst_entry *dst,
255 union sctp_addr *daddr, union sctp_addr *saddr)
257 struct sctp_bind_addr *bp;
259 struct sctp_sockaddr_entry *laddr;
260 struct list_head *pos;
262 union sctp_addr *baddr = NULL;
266 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
267 "daddr:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
268 __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr));
271 ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr);
272 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: "
273 "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
274 NIP6(saddr->v6.sin6_addr));
278 scope = sctp_scope(daddr);
280 bp = &asoc->base.bind_addr;
281 addr_lock = &asoc->base.addr_lock;
283 /* Go through the bind address list and find the best source address
284 * that matches the scope of the destination address.
286 sctp_read_lock(addr_lock);
287 list_for_each(pos, &bp->address_list) {
288 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
289 if ((laddr->a.sa.sa_family == AF_INET6) &&
290 (scope <= sctp_scope(&laddr->a))) {
291 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
292 if (!baddr || (matchlen < bmatchlen)) {
294 matchlen = bmatchlen;
300 memcpy(saddr, baddr, sizeof(union sctp_addr));
301 SCTP_DEBUG_PRINTK("saddr: "
302 "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
303 NIP6(saddr->v6.sin6_addr));
305 printk(KERN_ERR "%s: asoc:%p Could not find a valid source "
307 "dest:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
308 __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr));
311 sctp_read_unlock(addr_lock);
314 /* Make a copy of all potential local addresses. */
315 static void sctp_v6_copy_addrlist(struct list_head *addrlist,
316 struct net_device *dev)
318 struct inet6_dev *in6_dev;
319 struct inet6_ifaddr *ifp;
320 struct sctp_sockaddr_entry *addr;
322 read_lock(&addrconf_lock);
323 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
324 read_unlock(&addrconf_lock);
328 read_lock(&in6_dev->lock);
329 for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) {
330 /* Add the address to the local list. */
331 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
333 addr->a.v6.sin6_family = AF_INET6;
334 addr->a.v6.sin6_port = 0;
335 addr->a.v6.sin6_addr = ifp->addr;
336 addr->a.v6.sin6_scope_id = dev->ifindex;
337 INIT_LIST_HEAD(&addr->list);
338 list_add_tail(&addr->list, addrlist);
342 read_unlock(&in6_dev->lock);
343 read_unlock(&addrconf_lock);
346 /* Initialize a sockaddr_storage from in incoming skb. */
347 static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
354 port = &addr->v6.sin6_port;
355 addr->v6.sin6_family = AF_INET6;
356 addr->v6.sin6_flowinfo = 0; /* FIXME */
357 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
359 sh = (struct sctphdr *) skb->h.raw;
361 *port = ntohs(sh->source);
362 from = &skb->nh.ipv6h->saddr;
364 *port = ntohs(sh->dest);
365 from = &skb->nh.ipv6h->daddr;
367 ipv6_addr_copy(&addr->v6.sin6_addr, from);
370 /* Initialize an sctp_addr from a socket. */
371 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
373 addr->v6.sin6_family = AF_INET6;
374 addr->v6.sin6_port = inet_sk(sk)->num;
375 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
378 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
379 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
381 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
382 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
383 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
384 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
385 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
386 addr->v4.sin_addr.s_addr;
388 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
392 /* Initialize sk->sk_daddr from sctp_addr. */
393 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
395 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
396 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
397 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
398 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
399 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
401 inet6_sk(sk)->daddr = addr->v6.sin6_addr;
405 /* Initialize a sctp_addr from an address parameter. */
406 static void sctp_v6_from_addr_param(union sctp_addr *addr,
407 union sctp_addr_param *param,
410 addr->v6.sin6_family = AF_INET6;
411 addr->v6.sin6_port = port;
412 addr->v6.sin6_flowinfo = 0; /* BUG */
413 ipv6_addr_copy(&addr->v6.sin6_addr, ¶m->v6.addr);
414 addr->v6.sin6_scope_id = iif;
417 /* Initialize an address parameter from a sctp_addr and return the length
418 * of the address parameter.
420 static int sctp_v6_to_addr_param(const union sctp_addr *addr,
421 union sctp_addr_param *param)
423 int length = sizeof(sctp_ipv6addr_param_t);
425 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
426 param->v6.param_hdr.length = ntohs(length);
427 ipv6_addr_copy(¶m->v6.addr, &addr->v6.sin6_addr);
432 /* Initialize a sctp_addr from a dst_entry. */
433 static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst,
436 struct rt6_info *rt = (struct rt6_info *)dst;
437 addr->sa.sa_family = AF_INET6;
438 addr->v6.sin6_port = port;
439 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr);
442 /* Compare addresses exactly.
443 * v4-mapped-v6 is also in consideration.
445 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
446 const union sctp_addr *addr2)
448 if (addr1->sa.sa_family != addr2->sa.sa_family) {
449 if (addr1->sa.sa_family == AF_INET &&
450 addr2->sa.sa_family == AF_INET6 &&
451 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) {
452 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
453 addr2->v6.sin6_addr.s6_addr32[3] ==
454 addr1->v4.sin_addr.s_addr)
457 if (addr2->sa.sa_family == AF_INET &&
458 addr1->sa.sa_family == AF_INET6 &&
459 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) {
460 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
461 addr1->v6.sin6_addr.s6_addr32[3] ==
462 addr2->v4.sin_addr.s_addr)
467 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
469 /* If this is a linklocal address, compare the scope_id. */
470 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
471 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
472 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
480 /* Initialize addr struct to INADDR_ANY. */
481 static void sctp_v6_inaddr_any(union sctp_addr *addr, unsigned short port)
483 memset(addr, 0x00, sizeof(union sctp_addr));
484 addr->v6.sin6_family = AF_INET6;
485 addr->v6.sin6_port = port;
488 /* Is this a wildcard address? */
489 static int sctp_v6_is_any(const union sctp_addr *addr)
492 type = ipv6_addr_type((struct in6_addr *)&addr->v6.sin6_addr);
493 return IPV6_ADDR_ANY == type;
496 /* Should this be available for binding? */
497 static int sctp_v6_available(union sctp_addr *addr, struct sctp_opt *sp)
500 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr;
502 type = ipv6_addr_type(in6);
503 if (IPV6_ADDR_ANY == type)
505 if (type == IPV6_ADDR_MAPPED) {
506 if (sp && !sp->v4mapped)
508 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
510 sctp_v6_map_v4(addr);
511 return sctp_get_af_specific(AF_INET)->available(addr, sp);
513 if (!(type & IPV6_ADDR_UNICAST))
516 return ipv6_chk_addr(in6, NULL, 0);
519 /* This function checks if the address is a valid address to be used for
523 * Return 0 - If the address is a non-unicast or an illegal address.
524 * Return 1 - If the address is a unicast.
526 static int sctp_v6_addr_valid(union sctp_addr *addr, struct sctp_opt *sp)
528 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
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_opt.
535 if (!sp || !sp->v4mapped)
537 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
539 sctp_v6_map_v4(addr);
540 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp);
543 /* Is this a non-unicast address */
544 if (!(ret & IPV6_ADDR_UNICAST))
550 /* What is the scope of 'addr'? */
551 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
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.
560 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
563 retval = SCTP_SCOPE_LOOPBACK;
566 retval = SCTP_SCOPE_LINK;
569 retval = SCTP_SCOPE_PRIVATE;
572 retval = SCTP_SCOPE_GLOBAL;
579 /* Create and initialize a new sk for the socket to be returned by accept(). */
580 struct sock *sctp_v6_create_accept_sk(struct sock *sk,
581 struct sctp_association *asoc)
583 struct inet_opt *inet = inet_sk(sk);
585 struct inet_opt *newinet;
586 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
587 struct sctp6_sock *newsctp6sk;
589 newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot->slab_obj_size,
594 sock_init_data(NULL, newsk);
595 sk_set_owner(newsk, THIS_MODULE);
597 newsk->sk_type = SOCK_STREAM;
599 newsk->sk_prot = sk->sk_prot;
600 newsk->sk_no_check = sk->sk_no_check;
601 newsk->sk_reuse = sk->sk_reuse;
603 newsk->sk_destruct = inet_sock_destruct;
604 newsk->sk_zapped = 0;
605 newsk->sk_family = PF_INET6;
606 newsk->sk_protocol = IPPROTO_SCTP;
607 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
608 newsk->sk_shutdown = sk->sk_shutdown;
610 newsctp6sk = (struct sctp6_sock *)newsk;
611 newsctp6sk->pinet6 = &newsctp6sk->inet6;
613 newinet = inet_sk(newsk);
614 newnp = inet6_sk(newsk);
616 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
618 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
621 newinet->sport = inet->sport;
622 newnp->saddr = np->saddr;
623 newnp->rcv_saddr = np->rcv_saddr;
624 newinet->dport = htons(asoc->peer.port);
625 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
627 /* Init the ipv4 part of the socket since we can have sockets
628 * using v6 API for ipv4.
630 newinet->uc_ttl = -1;
631 newinet->mc_loop = 1;
633 newinet->mc_index = 0;
634 newinet->mc_list = NULL;
636 if (ipv4_config.no_pmtu_disc)
637 newinet->pmtudisc = IP_PMTUDISC_DONT;
639 newinet->pmtudisc = IP_PMTUDISC_WANT;
641 #ifdef INET_REFCNT_DEBUG
642 atomic_inc(&inet6_sock_nr);
643 atomic_inc(&inet_sock_nr);
646 if (newsk->sk_prot->init(newsk)) {
647 sk_common_release(newsk);
655 /* Map v4 address to mapped v6 address */
656 static void sctp_v6_addr_v4map(struct sctp_opt *sp, union sctp_addr *addr)
658 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
659 sctp_v4_map_v6(addr);
662 /* Where did this skb come from? */
663 static int sctp_v6_skb_iif(const struct sk_buff *skb)
665 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
669 /* Was this packet marked by Explicit Congestion Notification? */
670 static int sctp_v6_is_ce(const struct sk_buff *skb)
672 return *((__u32 *)(skb->nh.ipv6h)) & htonl(1<<20);
675 /* Dump the v6 addr to the seq file. */
676 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
678 seq_printf(seq, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
679 NIP6(addr->v6.sin6_addr));
682 /* Initialize a PF_INET6 socket msg_name. */
683 static void sctp_inet6_msgname(char *msgname, int *addr_len)
685 struct sockaddr_in6 *sin6;
687 sin6 = (struct sockaddr_in6 *)msgname;
688 sin6->sin6_family = AF_INET6;
689 sin6->sin6_flowinfo = 0;
690 sin6->sin6_scope_id = 0; /*FIXME */
691 *addr_len = sizeof(struct sockaddr_in6);
694 /* Initialize a PF_INET msgname from a ulpevent. */
695 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
696 char *msgname, int *addrlen)
698 struct sockaddr_in6 *sin6, *sin6from;
701 union sctp_addr *addr;
702 struct sctp_association *asoc;
705 sctp_inet6_msgname(msgname, addrlen);
706 sin6 = (struct sockaddr_in6 *)msgname;
707 sin6->sin6_port = htons(asoc->peer.port);
708 addr = &asoc->peer.primary_addr;
710 /* Note: If we go to a common v6 format, this code
714 /* Map ipv4 address into v4-mapped-on-v6 address. */
715 if (sctp_sk(asoc->base.sk)->v4mapped &&
716 AF_INET == addr->sa.sa_family) {
717 sctp_v4_map_v6((union sctp_addr *)sin6);
718 sin6->sin6_addr.s6_addr32[3] =
719 addr->v4.sin_addr.s_addr;
723 sin6from = &asoc->peer.primary_addr.v6;
724 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
725 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
726 sin6->sin6_scope_id = sin6from->sin6_scope_id;
730 /* Initialize a msg_name from an inbound skb. */
731 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
735 struct sockaddr_in6 *sin6;
738 sctp_inet6_msgname(msgname, addr_len);
739 sin6 = (struct sockaddr_in6 *)msgname;
740 sh = (struct sctphdr *)skb->h.raw;
741 sin6->sin6_port = sh->source;
743 /* Map ipv4 address into v4-mapped-on-v6 address. */
744 if (sctp_sk(skb->sk)->v4mapped &&
745 skb->nh.iph->version == 4) {
746 sctp_v4_map_v6((union sctp_addr *)sin6);
747 sin6->sin6_addr.s6_addr32[3] = skb->nh.iph->saddr;
751 /* Otherwise, just copy the v6 address. */
752 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
753 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
754 struct sctp_ulpevent *ev = sctp_skb2event(skb);
755 sin6->sin6_scope_id = ev->iif;
760 /* Do we support this AF? */
761 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_opt *sp)
766 /* v4-mapped-v6 addresses */
768 if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped)
775 /* Address matching with wildcards allowed. This extra level
776 * of indirection lets us choose whether a PF_INET6 should
777 * disallow any v4 addresses if we so choose.
779 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
780 const union sctp_addr *addr2,
781 struct sctp_opt *opt)
783 struct sctp_af *af1, *af2;
785 af1 = sctp_get_af_specific(addr1->sa.sa_family);
786 af2 = sctp_get_af_specific(addr2->sa.sa_family);
790 /* Today, wildcard AF_INET/AF_INET6. */
791 if (sctp_is_any(addr1) || sctp_is_any(addr2))
794 if (addr1->sa.sa_family != addr2->sa.sa_family)
797 return af1->cmp_addr(addr1, addr2);
800 /* Verify that the provided sockaddr looks bindable. Common verification,
801 * has already been taken care of.
803 static int sctp_inet6_bind_verify(struct sctp_opt *opt, union sctp_addr *addr)
807 /* ASSERT: address family has already been verified. */
808 if (addr->sa.sa_family != AF_INET6)
809 af = sctp_get_af_specific(addr->sa.sa_family);
812 int type = ipv6_addr_type(&addr->v6.sin6_addr);
813 sk = sctp_opt2sk(opt);
814 if (type & IPV6_ADDR_LINKLOCAL) {
815 /* Note: Behavior similar to af_inet6.c:
816 * 1) Overrides previous bound_dev_if
817 * 2) Destructive even if bind isn't successful.
820 if (addr->v6.sin6_scope_id)
821 sk->sk_bound_dev_if = addr->v6.sin6_scope_id;
822 if (!sk->sk_bound_dev_if)
827 return af->available(addr, opt);
830 /* Verify that the provided sockaddr looks bindable. Common verification,
831 * has already been taken care of.
833 static int sctp_inet6_send_verify(struct sctp_opt *opt, union sctp_addr *addr)
835 struct sctp_af *af = NULL;
837 /* ASSERT: address family has already been verified. */
838 if (addr->sa.sa_family != AF_INET6)
839 af = sctp_get_af_specific(addr->sa.sa_family);
842 int type = ipv6_addr_type(&addr->v6.sin6_addr);
843 sk = sctp_opt2sk(opt);
844 if (type & IPV6_ADDR_LINKLOCAL) {
845 /* Note: Behavior similar to af_inet6.c:
846 * 1) Overrides previous bound_dev_if
847 * 2) Destructive even if bind isn't successful.
850 if (addr->v6.sin6_scope_id)
851 sk->sk_bound_dev_if = addr->v6.sin6_scope_id;
852 if (!sk->sk_bound_dev_if)
861 /* Fill in Supported Address Type information for INIT and INIT-ACK
862 * chunks. Note: In the future, we may want to look at sock options
863 * to determine whether a PF_INET6 socket really wants to have IPV4
865 * Returns number of addresses supported.
867 static int sctp_inet6_supported_addrs(const struct sctp_opt *opt,
870 types[0] = SCTP_PARAM_IPV4_ADDRESS;
871 types[1] = SCTP_PARAM_IPV6_ADDRESS;
875 static struct proto_ops inet6_seqpacket_ops = {
877 .owner = THIS_MODULE,
878 .release = inet6_release,
880 .connect = inet_dgram_connect,
881 .socketpair = sock_no_socketpair,
882 .accept = inet_accept,
883 .getname = inet6_getname,
885 .ioctl = inet6_ioctl,
886 .listen = sctp_inet_listen,
887 .shutdown = inet_shutdown,
888 .setsockopt = sock_common_setsockopt,
889 .getsockopt = sock_common_getsockopt,
890 .sendmsg = inet_sendmsg,
891 .recvmsg = sock_common_recvmsg,
892 .mmap = sock_no_mmap,
895 static struct inet_protosw sctpv6_seqpacket_protosw = {
896 .type = SOCK_SEQPACKET,
897 .protocol = IPPROTO_SCTP,
898 .prot = &sctpv6_prot,
899 .ops = &inet6_seqpacket_ops,
902 .flags = SCTP_PROTOSW_FLAG
904 static struct inet_protosw sctpv6_stream_protosw = {
906 .protocol = IPPROTO_SCTP,
907 .prot = &sctpv6_prot,
908 .ops = &inet6_seqpacket_ops,
911 .flags = SCTP_PROTOSW_FLAG,
914 static int sctp6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
916 return sctp_rcv(*pskb) ? -1 : 0;
919 static struct inet6_protocol sctpv6_protocol = {
920 .handler = sctp6_rcv,
921 .err_handler = sctp_v6_err,
922 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
925 static struct sctp_af sctp_ipv6_specific = {
926 .sctp_xmit = sctp_v6_xmit,
927 .setsockopt = ipv6_setsockopt,
928 .getsockopt = ipv6_getsockopt,
929 .get_dst = sctp_v6_get_dst,
930 .get_saddr = sctp_v6_get_saddr,
931 .copy_addrlist = sctp_v6_copy_addrlist,
932 .from_skb = sctp_v6_from_skb,
933 .from_sk = sctp_v6_from_sk,
934 .to_sk_saddr = sctp_v6_to_sk_saddr,
935 .to_sk_daddr = sctp_v6_to_sk_daddr,
936 .from_addr_param = sctp_v6_from_addr_param,
937 .to_addr_param = sctp_v6_to_addr_param,
938 .dst_saddr = sctp_v6_dst_saddr,
939 .cmp_addr = sctp_v6_cmp_addr,
940 .scope = sctp_v6_scope,
941 .addr_valid = sctp_v6_addr_valid,
942 .inaddr_any = sctp_v6_inaddr_any,
943 .is_any = sctp_v6_is_any,
944 .available = sctp_v6_available,
945 .skb_iif = sctp_v6_skb_iif,
946 .is_ce = sctp_v6_is_ce,
947 .seq_dump_addr = sctp_v6_seq_dump_addr,
948 .net_header_len = sizeof(struct ipv6hdr),
949 .sockaddr_len = sizeof(struct sockaddr_in6),
950 .sa_family = AF_INET6,
953 static struct sctp_pf sctp_pf_inet6_specific = {
954 .event_msgname = sctp_inet6_event_msgname,
955 .skb_msgname = sctp_inet6_skb_msgname,
956 .af_supported = sctp_inet6_af_supported,
957 .cmp_addr = sctp_inet6_cmp_addr,
958 .bind_verify = sctp_inet6_bind_verify,
959 .send_verify = sctp_inet6_send_verify,
960 .supported_addrs = sctp_inet6_supported_addrs,
961 .create_accept_sk = sctp_v6_create_accept_sk,
962 .addr_v4map = sctp_v6_addr_v4map,
963 .af = &sctp_ipv6_specific,
966 /* Initialize IPv6 support and register with inet6 stack. */
967 int sctp_v6_init(void)
969 int rc = sk_alloc_slab(&sctpv6_prot, "sctpv6_sock");
973 /* Register inet6 protocol. */
975 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
976 goto out_sctp_free_slab;
978 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
979 inet6_register_protosw(&sctpv6_seqpacket_protosw);
980 inet6_register_protosw(&sctpv6_stream_protosw);
982 /* Register the SCTP specific PF_INET6 functions. */
983 sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6);
985 /* Register the SCTP specific AF_INET6 functions. */
986 sctp_register_af(&sctp_ipv6_specific);
988 /* Register notifier for inet6 address additions/deletions. */
989 register_inet6addr_notifier(&sctp_inet6addr_notifier);
994 sk_free_slab(&sctpv6_prot);
998 /* IPv6 specific exit support. */
999 void sctp_v6_exit(void)
1001 list_del(&sctp_ipv6_specific.list);
1002 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1003 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1004 inet6_unregister_protosw(&sctpv6_stream_protosw);
1005 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
1006 sk_free_slab(&sctpv6_prot);