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 struct notifier_block sctp_inetaddr_notifier;
83 /* ICMP error handler. */
84 void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
85 int type, int code, int offset, __u32 info)
87 struct inet6_dev *idev;
88 struct ipv6hdr *iph = (struct ipv6hdr *)skb->data;
89 struct sctphdr *sh = (struct sctphdr *)(skb->data + offset);
91 struct sctp_endpoint *ep;
92 struct sctp_association *asoc;
93 struct sctp_transport *transport;
94 struct ipv6_pinfo *np;
95 char *saveip, *savesctp;
98 idev = in6_dev_get(skb->dev);
100 /* Fix up skb to look at the embedded net header. */
101 saveip = skb->nh.raw;
102 savesctp = skb->h.raw;
104 skb->h.raw = (char *)sh;
105 sk = sctp_err_lookup(AF_INET6, skb, sh, &ep, &asoc, &transport);
106 /* Put back, the original pointers. */
107 skb->nh.raw = saveip;
108 skb->h.raw = savesctp;
110 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS);
114 /* Warning: The sock lock is held. Remember to call
119 case ICMPV6_PKT_TOOBIG:
120 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
127 icmpv6_err_convert(type, code, &err);
128 if (!sock_owned_by_user(sk) && np->recverr) {
130 sk->sk_error_report(sk);
131 } else { /* Only an error on timeout */
132 sk->sk_err_soft = err;
136 sctp_err_finish(sk, ep, asoc);
138 if (likely(idev != NULL))
142 /* Based on tcp_v6_xmit() in tcp_ipv6.c. */
143 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport,
146 struct sock *sk = skb->sk;
147 struct ipv6_pinfo *np = inet6_sk(sk);
150 memset(&fl, 0, sizeof(fl));
152 fl.proto = sk->sk_protocol;
154 /* Fill in the dest address from the route entry passed with the skb
155 * and the source address from the transport.
157 ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr);
158 ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr);
160 fl.fl6_flowlabel = np->flow_label;
161 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
162 if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL)
163 fl.oif = transport->saddr.v6.sin6_scope_id;
165 fl.oif = sk->sk_bound_dev_if;
166 fl.fl_ip_sport = inet_sk(sk)->sport;
167 fl.fl_ip_dport = transport->ipaddr.v6.sin6_port;
169 if (np->opt && np->opt->srcrt) {
170 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
171 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
174 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
175 "src:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
176 "dst:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
177 __FUNCTION__, skb, skb->len,
178 NIP6(fl.fl6_src), NIP6(fl.fl6_dst));
180 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
182 return ip6_xmit(sk, skb, &fl, np->opt, ipfragok);
185 /* Returns the dst cache entry for the given source and destination ip
188 struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
189 union sctp_addr *daddr,
190 union sctp_addr *saddr)
192 struct dst_entry *dst;
195 memset(&fl, 0, sizeof(fl));
196 ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr);
197 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
198 fl.oif = daddr->v6.sin6_scope_id;
201 SCTP_DEBUG_PRINTK("%s: DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
202 __FUNCTION__, NIP6(fl.fl6_dst));
205 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr);
207 "SRC=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x - ",
211 dst = ip6_route_output(NULL, &fl);
214 rt = (struct rt6_info *)dst;
216 "rt6_dst:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
217 "rt6_src:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
218 NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr));
220 SCTP_DEBUG_PRINTK("NO ROUTE\n");
226 /* Returns the number of consecutive initial bits that match in the 2 ipv6
229 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
232 struct in6_addr *a1 = &s1->v6.sin6_addr;
233 struct in6_addr *a2 = &s2->v6.sin6_addr;
236 for (i = 0; i < 4 ; i++) {
239 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i];
241 if ((j = fls(ntohl(a1xora2))))
242 return (i * 32 + 32 - j);
248 /* Fills in the source address(saddr) based on the destination address(daddr)
249 * and asoc's bind address list.
251 void sctp_v6_get_saddr(struct sctp_association *asoc, struct dst_entry *dst,
252 union sctp_addr *daddr, union sctp_addr *saddr)
254 struct sctp_bind_addr *bp;
256 struct sctp_sockaddr_entry *laddr;
257 struct list_head *pos;
259 union sctp_addr *baddr = NULL;
263 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
264 "daddr:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
265 __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr));
268 ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr);
269 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: "
270 "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
271 NIP6(saddr->v6.sin6_addr));
275 scope = sctp_scope(daddr);
277 bp = &asoc->base.bind_addr;
278 addr_lock = &asoc->base.addr_lock;
280 /* Go through the bind address list and find the best source address
281 * that matches the scope of the destination address.
283 sctp_read_lock(addr_lock);
284 list_for_each(pos, &bp->address_list) {
285 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
286 if ((laddr->a.sa.sa_family == AF_INET6) &&
287 (scope <= sctp_scope(&laddr->a))) {
288 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
289 if (!baddr || (matchlen < bmatchlen)) {
291 matchlen = bmatchlen;
297 memcpy(saddr, baddr, sizeof(union sctp_addr));
298 SCTP_DEBUG_PRINTK("saddr: "
299 "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
300 NIP6(saddr->v6.sin6_addr));
302 printk(KERN_ERR "%s: asoc:%p Could not find a valid source "
304 "dest:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
305 __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr));
308 sctp_read_unlock(addr_lock);
311 /* Make a copy of all potential local addresses. */
312 static void sctp_v6_copy_addrlist(struct list_head *addrlist,
313 struct net_device *dev)
315 struct inet6_dev *in6_dev;
316 struct inet6_ifaddr *ifp;
317 struct sctp_sockaddr_entry *addr;
319 read_lock(&addrconf_lock);
320 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
321 read_unlock(&addrconf_lock);
325 read_lock(&in6_dev->lock);
326 for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) {
327 /* Add the address to the local list. */
328 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
330 addr->a.v6.sin6_family = AF_INET6;
331 addr->a.v6.sin6_port = 0;
332 addr->a.v6.sin6_addr = ifp->addr;
333 addr->a.v6.sin6_scope_id = dev->ifindex;
334 INIT_LIST_HEAD(&addr->list);
335 list_add_tail(&addr->list, addrlist);
339 read_unlock(&in6_dev->lock);
340 read_unlock(&addrconf_lock);
343 /* Initialize a sockaddr_storage from in incoming skb. */
344 static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
351 port = &addr->v6.sin6_port;
352 addr->v6.sin6_family = AF_INET6;
353 addr->v6.sin6_flowinfo = 0; /* FIXME */
354 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
356 sh = (struct sctphdr *) skb->h.raw;
358 *port = ntohs(sh->source);
359 from = &skb->nh.ipv6h->saddr;
361 *port = ntohs(sh->dest);
362 from = &skb->nh.ipv6h->daddr;
364 ipv6_addr_copy(&addr->v6.sin6_addr, from);
367 /* Initialize an sctp_addr from a socket. */
368 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
370 addr->v6.sin6_family = AF_INET6;
371 addr->v6.sin6_port = inet_sk(sk)->num;
372 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
375 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
376 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
378 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
379 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
380 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
381 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
382 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
383 addr->v4.sin_addr.s_addr;
385 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
389 /* Initialize sk->sk_daddr from sctp_addr. */
390 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
392 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
393 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
394 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
395 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
396 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
398 inet6_sk(sk)->daddr = addr->v6.sin6_addr;
402 /* Initialize a sctp_addr from an address parameter. */
403 static void sctp_v6_from_addr_param(union sctp_addr *addr,
404 union sctp_addr_param *param,
407 addr->v6.sin6_family = AF_INET6;
408 addr->v6.sin6_port = port;
409 addr->v6.sin6_flowinfo = 0; /* BUG */
410 ipv6_addr_copy(&addr->v6.sin6_addr, ¶m->v6.addr);
411 addr->v6.sin6_scope_id = iif;
414 /* Initialize an address parameter from a sctp_addr and return the length
415 * of the address parameter.
417 static int sctp_v6_to_addr_param(const union sctp_addr *addr,
418 union sctp_addr_param *param)
420 int length = sizeof(sctp_ipv6addr_param_t);
422 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
423 param->v6.param_hdr.length = ntohs(length);
424 ipv6_addr_copy(¶m->v6.addr, &addr->v6.sin6_addr);
429 /* Initialize a sctp_addr from a dst_entry. */
430 static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst,
433 struct rt6_info *rt = (struct rt6_info *)dst;
434 addr->sa.sa_family = AF_INET6;
435 addr->v6.sin6_port = port;
436 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr);
439 /* Compare addresses exactly.
440 * v4-mapped-v6 is also in consideration.
442 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
443 const union sctp_addr *addr2)
445 if (addr1->sa.sa_family != addr2->sa.sa_family) {
446 if (addr1->sa.sa_family == AF_INET &&
447 addr2->sa.sa_family == AF_INET6 &&
448 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) {
449 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
450 addr2->v6.sin6_addr.s6_addr32[3] ==
451 addr1->v4.sin_addr.s_addr)
454 if (addr2->sa.sa_family == AF_INET &&
455 addr1->sa.sa_family == AF_INET6 &&
456 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) {
457 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
458 addr1->v6.sin6_addr.s6_addr32[3] ==
459 addr2->v4.sin_addr.s_addr)
464 if (ipv6_addr_cmp(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
466 /* If this is a linklocal address, compare the scope_id. */
467 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
468 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
469 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
477 /* Initialize addr struct to INADDR_ANY. */
478 static void sctp_v6_inaddr_any(union sctp_addr *addr, unsigned short port)
480 memset(addr, 0x00, sizeof(union sctp_addr));
481 addr->v6.sin6_family = AF_INET6;
482 addr->v6.sin6_port = port;
485 /* Is this a wildcard address? */
486 static int sctp_v6_is_any(const union sctp_addr *addr)
489 type = ipv6_addr_type((struct in6_addr *)&addr->v6.sin6_addr);
490 return IPV6_ADDR_ANY == type;
493 /* Should this be available for binding? */
494 static int sctp_v6_available(union sctp_addr *addr, struct sctp_opt *sp)
497 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr;
499 type = ipv6_addr_type(in6);
500 if (IPV6_ADDR_ANY == type)
502 if (type == IPV6_ADDR_MAPPED) {
503 if (sp && !sp->v4mapped)
505 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
507 sctp_v6_map_v4(addr);
508 return sctp_get_af_specific(AF_INET)->available(addr, sp);
510 if (!(type & IPV6_ADDR_UNICAST))
513 return ipv6_chk_addr(in6, NULL, 0);
516 /* This function checks if the address is a valid address to be used for
520 * Return 0 - If the address is a non-unicast or an illegal address.
521 * Return 1 - If the address is a unicast.
523 static int sctp_v6_addr_valid(union sctp_addr *addr, struct sctp_opt *sp)
525 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
527 /* Support v4-mapped-v6 address. */
528 if (ret == IPV6_ADDR_MAPPED) {
529 /* Note: This routine is used in input, so v4-mapped-v6
530 * are disallowed here when there is no sctp_opt.
532 if (!sp || !sp->v4mapped)
534 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
536 sctp_v6_map_v4(addr);
537 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp);
540 /* Is this a non-unicast address */
541 if (!(ret & IPV6_ADDR_UNICAST))
547 /* What is the scope of 'addr'? */
548 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
553 /* The IPv6 scope is really a set of bit fields.
554 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
557 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
560 retval = SCTP_SCOPE_LOOPBACK;
563 retval = SCTP_SCOPE_LINK;
566 retval = SCTP_SCOPE_PRIVATE;
569 retval = SCTP_SCOPE_GLOBAL;
576 /* Create and initialize a new sk for the socket to be returned by accept(). */
577 struct sock *sctp_v6_create_accept_sk(struct sock *sk,
578 struct sctp_association *asoc)
580 struct inet_opt *inet = inet_sk(sk);
582 struct inet_opt *newinet;
583 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
584 struct sctp6_sock *newsctp6sk;
586 newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot->slab_obj_size,
591 sock_init_data(NULL, newsk);
592 sk_set_owner(newsk, THIS_MODULE);
594 newsk->sk_type = SOCK_STREAM;
596 newsk->sk_prot = sk->sk_prot;
597 newsk->sk_no_check = sk->sk_no_check;
598 newsk->sk_reuse = sk->sk_reuse;
600 newsk->sk_destruct = inet_sock_destruct;
601 newsk->sk_zapped = 0;
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;
607 newsctp6sk = (struct sctp6_sock *)newsk;
608 newsctp6sk->pinet6 = &newsctp6sk->inet6;
610 newinet = inet_sk(newsk);
611 newnp = inet6_sk(newsk);
613 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
615 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
618 newinet->sport = inet->sport;
619 newnp->saddr = np->saddr;
620 newnp->rcv_saddr = np->rcv_saddr;
621 newinet->dport = htons(asoc->peer.port);
622 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
624 /* Init the ipv4 part of the socket since we can have sockets
625 * using v6 API for ipv4.
627 newinet->uc_ttl = -1;
628 newinet->mc_loop = 1;
630 newinet->mc_index = 0;
631 newinet->mc_list = NULL;
633 if (ipv4_config.no_pmtu_disc)
634 newinet->pmtudisc = IP_PMTUDISC_DONT;
636 newinet->pmtudisc = IP_PMTUDISC_WANT;
638 #ifdef INET_REFCNT_DEBUG
639 atomic_inc(&inet6_sock_nr);
640 atomic_inc(&inet_sock_nr);
643 if (newsk->sk_prot->init(newsk)) {
644 sk_common_release(newsk);
652 /* Map v4 address to mapped v6 address */
653 static void sctp_v6_addr_v4map(struct sctp_opt *sp, union sctp_addr *addr)
655 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
656 sctp_v4_map_v6(addr);
659 /* Where did this skb come from? */
660 static int sctp_v6_skb_iif(const struct sk_buff *skb)
662 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
666 /* Was this packet marked by Explicit Congestion Notification? */
667 static int sctp_v6_is_ce(const struct sk_buff *skb)
669 return *((__u32 *)(skb->nh.ipv6h)) & htonl(1<<20);
672 /* Dump the v6 addr to the seq file. */
673 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
675 seq_printf(seq, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
676 NIP6(addr->v6.sin6_addr));
679 /* Initialize a PF_INET6 socket msg_name. */
680 static void sctp_inet6_msgname(char *msgname, int *addr_len)
682 struct sockaddr_in6 *sin6;
684 sin6 = (struct sockaddr_in6 *)msgname;
685 sin6->sin6_family = AF_INET6;
686 sin6->sin6_flowinfo = 0;
687 sin6->sin6_scope_id = 0; /*FIXME */
688 *addr_len = sizeof(struct sockaddr_in6);
691 /* Initialize a PF_INET msgname from a ulpevent. */
692 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
693 char *msgname, int *addrlen)
695 struct sockaddr_in6 *sin6, *sin6from;
698 union sctp_addr *addr;
699 struct sctp_association *asoc;
702 sctp_inet6_msgname(msgname, addrlen);
703 sin6 = (struct sockaddr_in6 *)msgname;
704 sin6->sin6_port = htons(asoc->peer.port);
705 addr = &asoc->peer.primary_addr;
707 /* Note: If we go to a common v6 format, this code
711 /* Map ipv4 address into v4-mapped-on-v6 address. */
712 if (sctp_sk(asoc->base.sk)->v4mapped &&
713 AF_INET == addr->sa.sa_family) {
714 sctp_v4_map_v6((union sctp_addr *)sin6);
715 sin6->sin6_addr.s6_addr32[3] =
716 addr->v4.sin_addr.s_addr;
720 sin6from = &asoc->peer.primary_addr.v6;
721 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
722 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
723 sin6->sin6_scope_id = sin6from->sin6_scope_id;
727 /* Initialize a msg_name from an inbound skb. */
728 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
732 struct sockaddr_in6 *sin6;
735 sctp_inet6_msgname(msgname, addr_len);
736 sin6 = (struct sockaddr_in6 *)msgname;
737 sh = (struct sctphdr *)skb->h.raw;
738 sin6->sin6_port = sh->source;
740 /* Map ipv4 address into v4-mapped-on-v6 address. */
741 if (sctp_sk(skb->sk)->v4mapped &&
742 skb->nh.iph->version == 4) {
743 sctp_v4_map_v6((union sctp_addr *)sin6);
744 sin6->sin6_addr.s6_addr32[3] = skb->nh.iph->saddr;
748 /* Otherwise, just copy the v6 address. */
749 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
750 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
751 struct sctp_ulpevent *ev = sctp_skb2event(skb);
752 sin6->sin6_scope_id = ev->iif;
757 /* Do we support this AF? */
758 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_opt *sp)
763 /* v4-mapped-v6 addresses */
765 if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped)
772 /* Address matching with wildcards allowed. This extra level
773 * of indirection lets us choose whether a PF_INET6 should
774 * disallow any v4 addresses if we so choose.
776 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
777 const union sctp_addr *addr2,
778 struct sctp_opt *opt)
780 struct sctp_af *af1, *af2;
782 af1 = sctp_get_af_specific(addr1->sa.sa_family);
783 af2 = sctp_get_af_specific(addr2->sa.sa_family);
787 /* Today, wildcard AF_INET/AF_INET6. */
788 if (sctp_is_any(addr1) || sctp_is_any(addr2))
791 if (addr1->sa.sa_family != addr2->sa.sa_family)
794 return af1->cmp_addr(addr1, addr2);
797 /* Verify that the provided sockaddr looks bindable. Common verification,
798 * has already been taken care of.
800 static int sctp_inet6_bind_verify(struct sctp_opt *opt, union sctp_addr *addr)
804 /* ASSERT: address family has already been verified. */
805 if (addr->sa.sa_family != AF_INET6)
806 af = sctp_get_af_specific(addr->sa.sa_family);
809 int type = ipv6_addr_type(&addr->v6.sin6_addr);
810 sk = sctp_opt2sk(opt);
811 if (type & IPV6_ADDR_LINKLOCAL) {
812 /* Note: Behavior similar to af_inet6.c:
813 * 1) Overrides previous bound_dev_if
814 * 2) Destructive even if bind isn't successful.
817 if (addr->v6.sin6_scope_id)
818 sk->sk_bound_dev_if = addr->v6.sin6_scope_id;
819 if (!sk->sk_bound_dev_if)
824 return af->available(addr, opt);
827 /* Verify that the provided sockaddr looks bindable. Common verification,
828 * has already been taken care of.
830 static int sctp_inet6_send_verify(struct sctp_opt *opt, union sctp_addr *addr)
832 struct sctp_af *af = NULL;
834 /* ASSERT: address family has already been verified. */
835 if (addr->sa.sa_family != AF_INET6)
836 af = sctp_get_af_specific(addr->sa.sa_family);
839 int type = ipv6_addr_type(&addr->v6.sin6_addr);
840 sk = sctp_opt2sk(opt);
841 if (type & IPV6_ADDR_LINKLOCAL) {
842 /* Note: Behavior similar to af_inet6.c:
843 * 1) Overrides previous bound_dev_if
844 * 2) Destructive even if bind isn't successful.
847 if (addr->v6.sin6_scope_id)
848 sk->sk_bound_dev_if = addr->v6.sin6_scope_id;
849 if (!sk->sk_bound_dev_if)
858 /* Fill in Supported Address Type information for INIT and INIT-ACK
859 * chunks. Note: In the future, we may want to look at sock options
860 * to determine whether a PF_INET6 socket really wants to have IPV4
862 * Returns number of addresses supported.
864 static int sctp_inet6_supported_addrs(const struct sctp_opt *opt,
867 types[0] = SCTP_PARAM_IPV4_ADDRESS;
868 types[1] = SCTP_PARAM_IPV6_ADDRESS;
872 static struct proto_ops inet6_seqpacket_ops = {
874 .owner = THIS_MODULE,
875 .release = inet6_release,
877 .connect = inet_dgram_connect,
878 .socketpair = sock_no_socketpair,
879 .accept = inet_accept,
880 .getname = inet6_getname,
882 .ioctl = inet6_ioctl,
883 .listen = sctp_inet_listen,
884 .shutdown = inet_shutdown,
885 .setsockopt = sock_common_setsockopt,
886 .getsockopt = sock_common_getsockopt,
887 .sendmsg = inet_sendmsg,
888 .recvmsg = sock_common_recvmsg,
889 .mmap = sock_no_mmap,
892 static struct inet_protosw sctpv6_seqpacket_protosw = {
893 .type = SOCK_SEQPACKET,
894 .protocol = IPPROTO_SCTP,
895 .prot = &sctpv6_prot,
896 .ops = &inet6_seqpacket_ops,
899 .flags = SCTP_PROTOSW_FLAG
901 static struct inet_protosw sctpv6_stream_protosw = {
903 .protocol = IPPROTO_SCTP,
904 .prot = &sctpv6_prot,
905 .ops = &inet6_seqpacket_ops,
908 .flags = SCTP_PROTOSW_FLAG,
911 static int sctp6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
913 return sctp_rcv(*pskb) ? -1 : 0;
916 static struct inet6_protocol sctpv6_protocol = {
917 .handler = sctp6_rcv,
918 .err_handler = sctp_v6_err,
919 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
922 static struct sctp_af sctp_ipv6_specific = {
923 .sctp_xmit = sctp_v6_xmit,
924 .setsockopt = ipv6_setsockopt,
925 .getsockopt = ipv6_getsockopt,
926 .get_dst = sctp_v6_get_dst,
927 .get_saddr = sctp_v6_get_saddr,
928 .copy_addrlist = sctp_v6_copy_addrlist,
929 .from_skb = sctp_v6_from_skb,
930 .from_sk = sctp_v6_from_sk,
931 .to_sk_saddr = sctp_v6_to_sk_saddr,
932 .to_sk_daddr = sctp_v6_to_sk_daddr,
933 .from_addr_param = sctp_v6_from_addr_param,
934 .to_addr_param = sctp_v6_to_addr_param,
935 .dst_saddr = sctp_v6_dst_saddr,
936 .cmp_addr = sctp_v6_cmp_addr,
937 .scope = sctp_v6_scope,
938 .addr_valid = sctp_v6_addr_valid,
939 .inaddr_any = sctp_v6_inaddr_any,
940 .is_any = sctp_v6_is_any,
941 .available = sctp_v6_available,
942 .skb_iif = sctp_v6_skb_iif,
943 .is_ce = sctp_v6_is_ce,
944 .seq_dump_addr = sctp_v6_seq_dump_addr,
945 .net_header_len = sizeof(struct ipv6hdr),
946 .sockaddr_len = sizeof(struct sockaddr_in6),
947 .sa_family = AF_INET6,
950 static struct sctp_pf sctp_pf_inet6_specific = {
951 .event_msgname = sctp_inet6_event_msgname,
952 .skb_msgname = sctp_inet6_skb_msgname,
953 .af_supported = sctp_inet6_af_supported,
954 .cmp_addr = sctp_inet6_cmp_addr,
955 .bind_verify = sctp_inet6_bind_verify,
956 .send_verify = sctp_inet6_send_verify,
957 .supported_addrs = sctp_inet6_supported_addrs,
958 .create_accept_sk = sctp_v6_create_accept_sk,
959 .addr_v4map = sctp_v6_addr_v4map,
960 .af = &sctp_ipv6_specific,
963 /* Initialize IPv6 support and register with inet6 stack. */
964 int sctp_v6_init(void)
966 int rc = sk_alloc_slab(&sctpv6_prot, "sctpv6_sock");
970 /* Register inet6 protocol. */
972 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
973 goto out_sctp_free_slab;
975 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
976 inet6_register_protosw(&sctpv6_seqpacket_protosw);
977 inet6_register_protosw(&sctpv6_stream_protosw);
979 /* Register the SCTP specific PF_INET6 functions. */
980 sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6);
982 /* Register the SCTP specific AF_INET6 functions. */
983 sctp_register_af(&sctp_ipv6_specific);
985 /* Register notifier for inet6 address additions/deletions. */
986 register_inet6addr_notifier(&sctp_inetaddr_notifier);
991 sk_free_slab(&sctpv6_prot);
995 /* IPv6 specific exit support. */
996 void sctp_v6_exit(void)
998 list_del(&sctp_ipv6_specific.list);
999 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1000 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1001 inet6_unregister_protosw(&sctpv6_stream_protosw);
1002 unregister_inet6addr_notifier(&sctp_inetaddr_notifier);
1003 sk_free_slab(&sctpv6_prot);