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>
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>
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,
89 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
90 struct sctp_sockaddr_entry *addr = NULL;
91 struct sctp_sockaddr_entry *temp;
95 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
97 addr->a.v6.sin6_family = AF_INET6;
98 addr->a.v6.sin6_port = 0;
99 memcpy(&addr->a.v6.sin6_addr, &ifa->addr,
100 sizeof(struct in6_addr));
101 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
103 spin_lock_bh(&sctp_local_addr_lock);
104 list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
105 spin_unlock_bh(&sctp_local_addr_lock);
109 spin_lock_bh(&sctp_local_addr_lock);
110 list_for_each_entry_safe(addr, temp,
111 &sctp_local_addr_list, list) {
112 if (ipv6_addr_equal(&addr->a.v6.sin6_addr,
115 list_del_rcu(&addr->list);
119 spin_unlock_bh(&sctp_local_addr_lock);
120 if (addr && !addr->valid)
121 call_rcu(&addr->rcu, sctp_local_addr_free);
128 static struct notifier_block sctp_inet6addr_notifier = {
129 .notifier_call = sctp_inet6addr_event,
132 /* ICMP error handler. */
133 SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
134 int type, int code, int offset, __be32 info)
136 struct inet6_dev *idev;
138 struct sctp_association *asoc;
139 struct sctp_transport *transport;
140 struct ipv6_pinfo *np;
141 sk_buff_data_t saveip, savesctp;
144 idev = in6_dev_get(skb->dev);
146 /* Fix up skb to look at the embedded net header. */
147 saveip = skb->network_header;
148 savesctp = skb->transport_header;
149 skb_reset_network_header(skb);
150 skb_set_transport_header(skb, offset);
151 sk = sctp_err_lookup(AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
152 /* Put back, the original pointers. */
153 skb->network_header = saveip;
154 skb->transport_header = savesctp;
156 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS);
160 /* Warning: The sock lock is held. Remember to call
165 case ICMPV6_PKT_TOOBIG:
166 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
168 case ICMPV6_PARAMPROB:
169 if (ICMPV6_UNK_NEXTHDR == code) {
170 sctp_icmp_proto_unreachable(sk, asoc, transport);
179 icmpv6_err_convert(type, code, &err);
180 if (!sock_owned_by_user(sk) && np->recverr) {
182 sk->sk_error_report(sk);
183 } else { /* Only an error on timeout */
184 sk->sk_err_soft = err;
188 sctp_err_finish(sk, asoc);
190 if (likely(idev != NULL))
194 /* Based on tcp_v6_xmit() in tcp_ipv6.c. */
195 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport,
198 struct sock *sk = skb->sk;
199 struct ipv6_pinfo *np = inet6_sk(sk);
202 memset(&fl, 0, sizeof(fl));
204 fl.proto = sk->sk_protocol;
206 /* Fill in the dest address from the route entry passed with the skb
207 * and the source address from the transport.
209 ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr);
210 ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr);
212 fl.fl6_flowlabel = np->flow_label;
213 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
214 if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL)
215 fl.oif = transport->saddr.v6.sin6_scope_id;
217 fl.oif = sk->sk_bound_dev_if;
219 if (np->opt && np->opt->srcrt) {
220 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
221 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
224 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
225 "src:" NIP6_FMT " dst:" NIP6_FMT "\n",
226 __FUNCTION__, skb, skb->len,
227 NIP6(fl.fl6_src), NIP6(fl.fl6_dst));
229 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
231 return ip6_xmit(sk, skb, &fl, np->opt, ipfragok);
234 /* Returns the dst cache entry for the given source and destination ip
237 static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
238 union sctp_addr *daddr,
239 union sctp_addr *saddr)
241 struct dst_entry *dst;
244 memset(&fl, 0, sizeof(fl));
245 ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr);
246 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
247 fl.oif = daddr->v6.sin6_scope_id;
250 SCTP_DEBUG_PRINTK("%s: DST=" NIP6_FMT " ",
251 __FUNCTION__, NIP6(fl.fl6_dst));
254 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr);
256 "SRC=" NIP6_FMT " - ",
260 dst = ip6_route_output(NULL, &fl);
263 rt = (struct rt6_info *)dst;
265 "rt6_dst:" NIP6_FMT " rt6_src:" NIP6_FMT "\n",
266 NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr));
269 SCTP_DEBUG_PRINTK("NO ROUTE\n");
274 /* Returns the number of consecutive initial bits that match in the 2 ipv6
277 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
280 struct in6_addr *a1 = &s1->v6.sin6_addr;
281 struct in6_addr *a2 = &s2->v6.sin6_addr;
284 for (i = 0; i < 4 ; i++) {
287 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i];
289 if ((j = fls(ntohl(a1xora2))))
290 return (i * 32 + 32 - j);
296 /* Fills in the source address(saddr) based on the destination address(daddr)
297 * and asoc's bind address list.
299 static void sctp_v6_get_saddr(struct sctp_association *asoc,
300 struct dst_entry *dst,
301 union sctp_addr *daddr,
302 union sctp_addr *saddr)
304 struct sctp_bind_addr *bp;
306 struct sctp_sockaddr_entry *laddr;
307 struct list_head *pos;
309 union sctp_addr *baddr = NULL;
313 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
314 "daddr:" NIP6_FMT " ",
315 __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr));
318 ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr);
319 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT "\n",
320 NIP6(saddr->v6.sin6_addr));
324 scope = sctp_scope(daddr);
326 bp = &asoc->base.bind_addr;
327 addr_lock = &asoc->base.addr_lock;
329 /* Go through the bind address list and find the best source address
330 * that matches the scope of the destination address.
332 sctp_read_lock(addr_lock);
333 list_for_each(pos, &bp->address_list) {
334 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
335 if ((laddr->use_as_src) &&
336 (laddr->a.sa.sa_family == AF_INET6) &&
337 (scope <= sctp_scope(&laddr->a))) {
338 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
339 if (!baddr || (matchlen < bmatchlen)) {
341 matchlen = bmatchlen;
347 memcpy(saddr, baddr, sizeof(union sctp_addr));
348 SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT "\n",
349 NIP6(saddr->v6.sin6_addr));
351 printk(KERN_ERR "%s: asoc:%p Could not find a valid source "
352 "address for the dest:" NIP6_FMT "\n",
353 __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr));
356 sctp_read_unlock(addr_lock);
359 /* Make a copy of all potential local addresses. */
360 static void sctp_v6_copy_addrlist(struct list_head *addrlist,
361 struct net_device *dev)
363 struct inet6_dev *in6_dev;
364 struct inet6_ifaddr *ifp;
365 struct sctp_sockaddr_entry *addr;
368 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
373 read_lock_bh(&in6_dev->lock);
374 for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) {
375 /* Add the address to the local list. */
376 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
378 addr->a.v6.sin6_family = AF_INET6;
379 addr->a.v6.sin6_port = 0;
380 addr->a.v6.sin6_addr = ifp->addr;
381 addr->a.v6.sin6_scope_id = dev->ifindex;
383 INIT_LIST_HEAD(&addr->list);
384 INIT_RCU_HEAD(&addr->rcu);
385 list_add_tail(&addr->list, addrlist);
389 read_unlock_bh(&in6_dev->lock);
393 /* Initialize a sockaddr_storage from in incoming skb. */
394 static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
401 port = &addr->v6.sin6_port;
402 addr->v6.sin6_family = AF_INET6;
403 addr->v6.sin6_flowinfo = 0; /* FIXME */
404 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
409 from = &ipv6_hdr(skb)->saddr;
412 from = &ipv6_hdr(skb)->daddr;
414 ipv6_addr_copy(&addr->v6.sin6_addr, from);
417 /* Initialize an sctp_addr from a socket. */
418 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
420 addr->v6.sin6_family = AF_INET6;
421 addr->v6.sin6_port = 0;
422 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
425 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
426 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
428 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
429 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
430 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
431 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
432 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
433 addr->v4.sin_addr.s_addr;
435 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
439 /* Initialize sk->sk_daddr from sctp_addr. */
440 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
442 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
443 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
444 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
445 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
446 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
448 inet6_sk(sk)->daddr = addr->v6.sin6_addr;
452 /* Initialize a sctp_addr from an address parameter. */
453 static void sctp_v6_from_addr_param(union sctp_addr *addr,
454 union sctp_addr_param *param,
455 __be16 port, int iif)
457 addr->v6.sin6_family = AF_INET6;
458 addr->v6.sin6_port = port;
459 addr->v6.sin6_flowinfo = 0; /* BUG */
460 ipv6_addr_copy(&addr->v6.sin6_addr, ¶m->v6.addr);
461 addr->v6.sin6_scope_id = iif;
464 /* Initialize an address parameter from a sctp_addr and return the length
465 * of the address parameter.
467 static int sctp_v6_to_addr_param(const union sctp_addr *addr,
468 union sctp_addr_param *param)
470 int length = sizeof(sctp_ipv6addr_param_t);
472 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
473 param->v6.param_hdr.length = htons(length);
474 ipv6_addr_copy(¶m->v6.addr, &addr->v6.sin6_addr);
479 /* Initialize a sctp_addr from a dst_entry. */
480 static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst,
483 struct rt6_info *rt = (struct rt6_info *)dst;
484 addr->sa.sa_family = AF_INET6;
485 addr->v6.sin6_port = port;
486 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr);
489 /* Compare addresses exactly.
490 * v4-mapped-v6 is also in consideration.
492 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
493 const union sctp_addr *addr2)
495 if (addr1->sa.sa_family != addr2->sa.sa_family) {
496 if (addr1->sa.sa_family == AF_INET &&
497 addr2->sa.sa_family == AF_INET6 &&
498 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) {
499 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
500 addr2->v6.sin6_addr.s6_addr32[3] ==
501 addr1->v4.sin_addr.s_addr)
504 if (addr2->sa.sa_family == AF_INET &&
505 addr1->sa.sa_family == AF_INET6 &&
506 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) {
507 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
508 addr1->v6.sin6_addr.s6_addr32[3] ==
509 addr2->v4.sin_addr.s_addr)
514 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
516 /* If this is a linklocal address, compare the scope_id. */
517 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
518 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
519 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
527 /* Initialize addr struct to INADDR_ANY. */
528 static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
530 memset(addr, 0x00, sizeof(union sctp_addr));
531 addr->v6.sin6_family = AF_INET6;
532 addr->v6.sin6_port = port;
535 /* Is this a wildcard address? */
536 static int sctp_v6_is_any(const union sctp_addr *addr)
538 return ipv6_addr_any(&addr->v6.sin6_addr);
541 /* Should this be available for binding? */
542 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
545 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr;
547 type = ipv6_addr_type(in6);
548 if (IPV6_ADDR_ANY == type)
550 if (type == IPV6_ADDR_MAPPED) {
551 if (sp && !sp->v4mapped)
553 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
555 sctp_v6_map_v4(addr);
556 return sctp_get_af_specific(AF_INET)->available(addr, sp);
558 if (!(type & IPV6_ADDR_UNICAST))
561 return ipv6_chk_addr(in6, NULL, 0);
564 /* This function checks if the address is a valid address to be used for
568 * Return 0 - If the address is a non-unicast or an illegal address.
569 * Return 1 - If the address is a unicast.
571 static int sctp_v6_addr_valid(union sctp_addr *addr,
572 struct sctp_sock *sp,
573 const struct sk_buff *skb)
575 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
577 /* Support v4-mapped-v6 address. */
578 if (ret == IPV6_ADDR_MAPPED) {
579 /* Note: This routine is used in input, so v4-mapped-v6
580 * are disallowed here when there is no sctp_sock.
582 if (!sp || !sp->v4mapped)
584 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
586 sctp_v6_map_v4(addr);
587 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
590 /* Is this a non-unicast address */
591 if (!(ret & IPV6_ADDR_UNICAST))
597 /* What is the scope of 'addr'? */
598 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
603 /* The IPv6 scope is really a set of bit fields.
604 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
607 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
610 retval = SCTP_SCOPE_LOOPBACK;
613 retval = SCTP_SCOPE_LINK;
616 retval = SCTP_SCOPE_PRIVATE;
619 retval = SCTP_SCOPE_GLOBAL;
626 /* Create and initialize a new sk for the socket to be returned by accept(). */
627 static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
628 struct sctp_association *asoc)
630 struct inet_sock *inet = inet_sk(sk);
632 struct inet_sock *newinet;
633 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
634 struct sctp6_sock *newsctp6sk;
636 newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot, 1);
640 sock_init_data(NULL, newsk);
642 newsk->sk_type = SOCK_STREAM;
644 newsk->sk_prot = sk->sk_prot;
645 newsk->sk_no_check = sk->sk_no_check;
646 newsk->sk_reuse = sk->sk_reuse;
648 newsk->sk_destruct = inet_sock_destruct;
649 newsk->sk_family = PF_INET6;
650 newsk->sk_protocol = IPPROTO_SCTP;
651 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
652 newsk->sk_shutdown = sk->sk_shutdown;
653 sock_reset_flag(sk, SOCK_ZAPPED);
655 newsctp6sk = (struct sctp6_sock *)newsk;
656 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
658 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
660 newinet = inet_sk(newsk);
661 newnp = inet6_sk(newsk);
663 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
665 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
668 newinet->sport = inet->sport;
669 newnp->saddr = np->saddr;
670 newnp->rcv_saddr = np->rcv_saddr;
671 newinet->dport = htons(asoc->peer.port);
672 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
674 /* Init the ipv4 part of the socket since we can have sockets
675 * using v6 API for ipv4.
677 newinet->uc_ttl = -1;
678 newinet->mc_loop = 1;
680 newinet->mc_index = 0;
681 newinet->mc_list = NULL;
683 if (ipv4_config.no_pmtu_disc)
684 newinet->pmtudisc = IP_PMTUDISC_DONT;
686 newinet->pmtudisc = IP_PMTUDISC_WANT;
688 sk_refcnt_debug_inc(newsk);
690 if (newsk->sk_prot->init(newsk)) {
691 sk_common_release(newsk);
699 /* Map v4 address to mapped v6 address */
700 static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
702 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
703 sctp_v4_map_v6(addr);
706 /* Where did this skb come from? */
707 static int sctp_v6_skb_iif(const struct sk_buff *skb)
709 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
713 /* Was this packet marked by Explicit Congestion Notification? */
714 static int sctp_v6_is_ce(const struct sk_buff *skb)
716 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
719 /* Dump the v6 addr to the seq file. */
720 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
722 seq_printf(seq, NIP6_FMT " ", NIP6(addr->v6.sin6_addr));
725 /* Initialize a PF_INET6 socket msg_name. */
726 static void sctp_inet6_msgname(char *msgname, int *addr_len)
728 struct sockaddr_in6 *sin6;
730 sin6 = (struct sockaddr_in6 *)msgname;
731 sin6->sin6_family = AF_INET6;
732 sin6->sin6_flowinfo = 0;
733 sin6->sin6_scope_id = 0; /*FIXME */
734 *addr_len = sizeof(struct sockaddr_in6);
737 /* Initialize a PF_INET msgname from a ulpevent. */
738 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
739 char *msgname, int *addrlen)
741 struct sockaddr_in6 *sin6, *sin6from;
744 union sctp_addr *addr;
745 struct sctp_association *asoc;
748 sctp_inet6_msgname(msgname, addrlen);
749 sin6 = (struct sockaddr_in6 *)msgname;
750 sin6->sin6_port = htons(asoc->peer.port);
751 addr = &asoc->peer.primary_addr;
753 /* Note: If we go to a common v6 format, this code
757 /* Map ipv4 address into v4-mapped-on-v6 address. */
758 if (sctp_sk(asoc->base.sk)->v4mapped &&
759 AF_INET == addr->sa.sa_family) {
760 sctp_v4_map_v6((union sctp_addr *)sin6);
761 sin6->sin6_addr.s6_addr32[3] =
762 addr->v4.sin_addr.s_addr;
766 sin6from = &asoc->peer.primary_addr.v6;
767 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
768 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
769 sin6->sin6_scope_id = sin6from->sin6_scope_id;
773 /* Initialize a msg_name from an inbound skb. */
774 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
778 struct sockaddr_in6 *sin6;
781 sctp_inet6_msgname(msgname, addr_len);
782 sin6 = (struct sockaddr_in6 *)msgname;
784 sin6->sin6_port = sh->source;
786 /* Map ipv4 address into v4-mapped-on-v6 address. */
787 if (sctp_sk(skb->sk)->v4mapped &&
788 ip_hdr(skb)->version == 4) {
789 sctp_v4_map_v6((union sctp_addr *)sin6);
790 sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr;
794 /* Otherwise, just copy the v6 address. */
795 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
796 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
797 struct sctp_ulpevent *ev = sctp_skb2event(skb);
798 sin6->sin6_scope_id = ev->iif;
803 /* Do we support this AF? */
804 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
809 /* v4-mapped-v6 addresses */
811 if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped)
818 /* Address matching with wildcards allowed. This extra level
819 * of indirection lets us choose whether a PF_INET6 should
820 * disallow any v4 addresses if we so choose.
822 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
823 const union sctp_addr *addr2,
824 struct sctp_sock *opt)
826 struct sctp_af *af1, *af2;
828 af1 = sctp_get_af_specific(addr1->sa.sa_family);
829 af2 = sctp_get_af_specific(addr2->sa.sa_family);
833 /* Today, wildcard AF_INET/AF_INET6. */
834 if (sctp_is_any(addr1) || sctp_is_any(addr2))
837 if (addr1->sa.sa_family != addr2->sa.sa_family)
840 return af1->cmp_addr(addr1, addr2);
843 /* Verify that the provided sockaddr looks bindable. Common verification,
844 * has already been taken care of.
846 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
850 /* ASSERT: address family has already been verified. */
851 if (addr->sa.sa_family != AF_INET6)
852 af = sctp_get_af_specific(addr->sa.sa_family);
854 int type = ipv6_addr_type(&addr->v6.sin6_addr);
855 struct net_device *dev;
857 if (type & IPV6_ADDR_LINKLOCAL) {
858 if (!addr->v6.sin6_scope_id)
860 dev = dev_get_by_index(addr->v6.sin6_scope_id);
863 if (!ipv6_chk_addr(&addr->v6.sin6_addr, dev, 0)) {
871 return af->available(addr, opt);
874 /* Verify that the provided sockaddr looks sendable. Common verification,
875 * has already been taken care of.
877 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
879 struct sctp_af *af = NULL;
881 /* ASSERT: address family has already been verified. */
882 if (addr->sa.sa_family != AF_INET6)
883 af = sctp_get_af_specific(addr->sa.sa_family);
885 int type = ipv6_addr_type(&addr->v6.sin6_addr);
886 struct net_device *dev;
888 if (type & IPV6_ADDR_LINKLOCAL) {
889 if (!addr->v6.sin6_scope_id)
891 dev = dev_get_by_index(addr->v6.sin6_scope_id);
902 /* Fill in Supported Address Type information for INIT and INIT-ACK
903 * chunks. Note: In the future, we may want to look at sock options
904 * to determine whether a PF_INET6 socket really wants to have IPV4
906 * Returns number of addresses supported.
908 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
911 types[0] = SCTP_PARAM_IPV4_ADDRESS;
912 types[1] = SCTP_PARAM_IPV6_ADDRESS;
916 static const struct proto_ops inet6_seqpacket_ops = {
918 .owner = THIS_MODULE,
919 .release = inet6_release,
921 .connect = inet_dgram_connect,
922 .socketpair = sock_no_socketpair,
923 .accept = inet_accept,
924 .getname = inet6_getname,
926 .ioctl = inet6_ioctl,
927 .listen = sctp_inet_listen,
928 .shutdown = inet_shutdown,
929 .setsockopt = sock_common_setsockopt,
930 .getsockopt = sock_common_getsockopt,
931 .sendmsg = inet_sendmsg,
932 .recvmsg = sock_common_recvmsg,
933 .mmap = sock_no_mmap,
935 .compat_setsockopt = compat_sock_common_setsockopt,
936 .compat_getsockopt = compat_sock_common_getsockopt,
940 static struct inet_protosw sctpv6_seqpacket_protosw = {
941 .type = SOCK_SEQPACKET,
942 .protocol = IPPROTO_SCTP,
943 .prot = &sctpv6_prot,
944 .ops = &inet6_seqpacket_ops,
947 .flags = SCTP_PROTOSW_FLAG
949 static struct inet_protosw sctpv6_stream_protosw = {
951 .protocol = IPPROTO_SCTP,
952 .prot = &sctpv6_prot,
953 .ops = &inet6_seqpacket_ops,
956 .flags = SCTP_PROTOSW_FLAG,
959 static int sctp6_rcv(struct sk_buff **pskb)
961 return sctp_rcv(*pskb) ? -1 : 0;
964 static struct inet6_protocol sctpv6_protocol = {
965 .handler = sctp6_rcv,
966 .err_handler = sctp_v6_err,
967 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
970 static struct sctp_af sctp_ipv6_specific = {
971 .sa_family = AF_INET6,
972 .sctp_xmit = sctp_v6_xmit,
973 .setsockopt = ipv6_setsockopt,
974 .getsockopt = ipv6_getsockopt,
975 .get_dst = sctp_v6_get_dst,
976 .get_saddr = sctp_v6_get_saddr,
977 .copy_addrlist = sctp_v6_copy_addrlist,
978 .from_skb = sctp_v6_from_skb,
979 .from_sk = sctp_v6_from_sk,
980 .to_sk_saddr = sctp_v6_to_sk_saddr,
981 .to_sk_daddr = sctp_v6_to_sk_daddr,
982 .from_addr_param = sctp_v6_from_addr_param,
983 .to_addr_param = sctp_v6_to_addr_param,
984 .dst_saddr = sctp_v6_dst_saddr,
985 .cmp_addr = sctp_v6_cmp_addr,
986 .scope = sctp_v6_scope,
987 .addr_valid = sctp_v6_addr_valid,
988 .inaddr_any = sctp_v6_inaddr_any,
989 .is_any = sctp_v6_is_any,
990 .available = sctp_v6_available,
991 .skb_iif = sctp_v6_skb_iif,
992 .is_ce = sctp_v6_is_ce,
993 .seq_dump_addr = sctp_v6_seq_dump_addr,
994 .net_header_len = sizeof(struct ipv6hdr),
995 .sockaddr_len = sizeof(struct sockaddr_in6),
997 .compat_setsockopt = compat_ipv6_setsockopt,
998 .compat_getsockopt = compat_ipv6_getsockopt,
1002 static struct sctp_pf sctp_pf_inet6_specific = {
1003 .event_msgname = sctp_inet6_event_msgname,
1004 .skb_msgname = sctp_inet6_skb_msgname,
1005 .af_supported = sctp_inet6_af_supported,
1006 .cmp_addr = sctp_inet6_cmp_addr,
1007 .bind_verify = sctp_inet6_bind_verify,
1008 .send_verify = sctp_inet6_send_verify,
1009 .supported_addrs = sctp_inet6_supported_addrs,
1010 .create_accept_sk = sctp_v6_create_accept_sk,
1011 .addr_v4map = sctp_v6_addr_v4map,
1012 .af = &sctp_ipv6_specific,
1015 /* Initialize IPv6 support and register with socket layer. */
1016 int sctp_v6_init(void)
1020 /* Register the SCTP specific PF_INET6 functions. */
1021 sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6);
1023 /* Register the SCTP specific AF_INET6 functions. */
1024 sctp_register_af(&sctp_ipv6_specific);
1026 rc = proto_register(&sctpv6_prot, 1);
1030 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1031 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1032 inet6_register_protosw(&sctpv6_stream_protosw);
1037 /* Register with inet6 layer. */
1038 int sctp_v6_add_protocol(void)
1040 /* Register notifier for inet6 address additions/deletions. */
1041 register_inet6addr_notifier(&sctp_inet6addr_notifier);
1043 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1049 /* IPv6 specific exit support. */
1050 void sctp_v6_exit(void)
1052 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1053 inet6_unregister_protosw(&sctpv6_stream_protosw);
1054 proto_unregister(&sctpv6_prot);
1055 list_del(&sctp_ipv6_specific.list);
1058 /* Unregister with inet6 layer. */
1059 void sctp_v6_del_protocol(void)
1061 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1062 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);