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
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)
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
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;
96 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
98 addr->a.v6.sin6_family = AF_INET6;
99 addr->a.v6.sin6_port = 0;
100 ipv6_addr_copy(&addr->a.v6.sin6_addr, &ifa->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 (addr->a.sa.sa_family == AF_INET6 &&
113 ipv6_addr_equal(&addr->a.v6.sin6_addr,
117 list_del_rcu(&addr->list);
121 spin_unlock_bh(&sctp_local_addr_lock);
123 call_rcu(&addr->rcu, sctp_local_addr_free);
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 u8 type, u8 code, int offset, __be32 info)
138 struct inet6_dev *idev;
140 struct sctp_association *asoc;
141 struct sctp_transport *transport;
142 struct ipv6_pinfo *np;
143 sk_buff_data_t saveip, savesctp;
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;
158 ICMP6_INC_STATS_BH(dev_net(skb->dev), idev, ICMP6_MIB_INERRORS);
162 /* Warning: The sock lock is held. Remember to call
167 case ICMPV6_PKT_TOOBIG:
168 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
170 case ICMPV6_PARAMPROB:
171 if (ICMPV6_UNK_NEXTHDR == code) {
172 sctp_icmp_proto_unreachable(sk, asoc, transport);
181 icmpv6_err_convert(type, code, &err);
182 if (!sock_owned_by_user(sk) && np->recverr) {
184 sk->sk_error_report(sk);
185 } else { /* Only an error on timeout */
186 sk->sk_err_soft = err;
190 sctp_err_finish(sk, asoc);
192 if (likely(idev != NULL))
196 /* Based on tcp_v6_xmit() in tcp_ipv6.c. */
197 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
199 struct sock *sk = skb->sk;
200 struct ipv6_pinfo *np = inet6_sk(sk);
203 memset(&fl, 0, sizeof(fl));
205 fl.proto = sk->sk_protocol;
207 /* Fill in the dest address from the route entry passed with the skb
208 * and the source address from the transport.
210 ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr);
211 ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr);
213 fl.fl6_flowlabel = np->flow_label;
214 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
215 if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL)
216 fl.oif = transport->saddr.v6.sin6_scope_id;
218 fl.oif = sk->sk_bound_dev_if;
220 if (np->opt && np->opt->srcrt) {
221 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
222 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
225 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n",
226 __func__, skb, skb->len,
227 &fl.fl6_src, &fl.fl6_dst);
229 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
231 if (!(transport->param_flags & SPP_PMTUD_ENABLE))
234 return ip6_xmit(sk, skb, &fl, np->opt, 0);
237 /* Returns the dst cache entry for the given source and destination ip
240 static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
241 union sctp_addr *daddr,
242 union sctp_addr *saddr)
244 struct dst_entry *dst;
247 memset(&fl, 0, sizeof(fl));
248 ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr);
249 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
250 fl.oif = daddr->v6.sin6_scope_id;
253 SCTP_DEBUG_PRINTK("%s: DST=%pI6 ", __func__, &fl.fl6_dst);
256 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr);
257 SCTP_DEBUG_PRINTK("SRC=%pI6 - ", &fl.fl6_src);
260 dst = ip6_route_output(&init_net, NULL, &fl);
263 rt = (struct rt6_info *)dst;
264 SCTP_DEBUG_PRINTK("rt6_dst:%pI6 rt6_src:%pI6\n",
265 &rt->rt6i_dst.addr, &rt->rt6i_src.addr);
268 SCTP_DEBUG_PRINTK("NO ROUTE\n");
273 /* Returns the number of consecutive initial bits that match in the 2 ipv6
276 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
279 struct in6_addr *a1 = &s1->v6.sin6_addr;
280 struct in6_addr *a2 = &s2->v6.sin6_addr;
283 for (i = 0; i < 4 ; i++) {
286 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i];
288 if ((j = fls(ntohl(a1xora2))))
289 return (i * 32 + 32 - j);
295 /* Fills in the source address(saddr) based on the destination address(daddr)
296 * and asoc's bind address list.
298 static void sctp_v6_get_saddr(struct sctp_sock *sk,
299 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;
305 struct sctp_sockaddr_entry *laddr;
307 union sctp_addr *baddr = NULL;
311 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p daddr:%pI6 ",
312 __func__, asoc, dst, &daddr->v6.sin6_addr);
315 ipv6_dev_get_saddr(sock_net(sctp_opt2sk(sk)),
316 dst ? ip6_dst_idev(dst)->dev : NULL,
317 &daddr->v6.sin6_addr,
318 inet6_sk(&sk->inet.sk)->srcprefs,
319 &saddr->v6.sin6_addr);
320 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: %pI6\n",
321 &saddr->v6.sin6_addr);
325 scope = sctp_scope(daddr);
327 bp = &asoc->base.bind_addr;
329 /* Go through the bind address list and find the best source address
330 * that matches the scope of the destination address.
333 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
336 if ((laddr->state == SCTP_ADDR_SRC) &&
337 (laddr->a.sa.sa_family == AF_INET6) &&
338 (scope <= sctp_scope(&laddr->a))) {
339 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
340 if (!baddr || (matchlen < bmatchlen)) {
342 matchlen = bmatchlen;
348 memcpy(saddr, baddr, sizeof(union sctp_addr));
349 SCTP_DEBUG_PRINTK("saddr: %pI6\n", &saddr->v6.sin6_addr);
351 printk(KERN_ERR "%s: asoc:%p Could not find a valid source "
352 "address for the dest:%pI6\n",
353 __func__, asoc, &daddr->v6.sin6_addr);
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_v4mapped(&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_v4mapped(&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(&init_net, 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)
631 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
632 struct sctp6_sock *newsctp6sk;
634 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot);
638 sock_init_data(NULL, newsk);
640 sctp_copy_sock(newsk, sk, asoc);
641 sock_reset_flag(sk, SOCK_ZAPPED);
643 newsctp6sk = (struct sctp6_sock *)newsk;
644 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
646 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
648 newnp = inet6_sk(newsk);
650 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
652 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
655 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
657 sk_refcnt_debug_inc(newsk);
659 if (newsk->sk_prot->init(newsk)) {
660 sk_common_release(newsk);
668 /* Map v4 address to mapped v6 address */
669 static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
671 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
672 sctp_v4_map_v6(addr);
675 /* Where did this skb come from? */
676 static int sctp_v6_skb_iif(const struct sk_buff *skb)
678 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
682 /* Was this packet marked by Explicit Congestion Notification? */
683 static int sctp_v6_is_ce(const struct sk_buff *skb)
685 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
688 /* Dump the v6 addr to the seq file. */
689 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
691 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
694 static void sctp_v6_ecn_capable(struct sock *sk)
696 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
699 /* Initialize a PF_INET6 socket msg_name. */
700 static void sctp_inet6_msgname(char *msgname, int *addr_len)
702 struct sockaddr_in6 *sin6;
704 sin6 = (struct sockaddr_in6 *)msgname;
705 sin6->sin6_family = AF_INET6;
706 sin6->sin6_flowinfo = 0;
707 sin6->sin6_scope_id = 0; /*FIXME */
708 *addr_len = sizeof(struct sockaddr_in6);
711 /* Initialize a PF_INET msgname from a ulpevent. */
712 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
713 char *msgname, int *addrlen)
715 struct sockaddr_in6 *sin6, *sin6from;
718 union sctp_addr *addr;
719 struct sctp_association *asoc;
722 sctp_inet6_msgname(msgname, addrlen);
723 sin6 = (struct sockaddr_in6 *)msgname;
724 sin6->sin6_port = htons(asoc->peer.port);
725 addr = &asoc->peer.primary_addr;
727 /* Note: If we go to a common v6 format, this code
731 /* Map ipv4 address into v4-mapped-on-v6 address. */
732 if (sctp_sk(asoc->base.sk)->v4mapped &&
733 AF_INET == addr->sa.sa_family) {
734 sctp_v4_map_v6((union sctp_addr *)sin6);
735 sin6->sin6_addr.s6_addr32[3] =
736 addr->v4.sin_addr.s_addr;
740 sin6from = &asoc->peer.primary_addr.v6;
741 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
742 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
743 sin6->sin6_scope_id = sin6from->sin6_scope_id;
747 /* Initialize a msg_name from an inbound skb. */
748 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
752 struct sockaddr_in6 *sin6;
755 sctp_inet6_msgname(msgname, addr_len);
756 sin6 = (struct sockaddr_in6 *)msgname;
758 sin6->sin6_port = sh->source;
760 /* Map ipv4 address into v4-mapped-on-v6 address. */
761 if (sctp_sk(skb->sk)->v4mapped &&
762 ip_hdr(skb)->version == 4) {
763 sctp_v4_map_v6((union sctp_addr *)sin6);
764 sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr;
768 /* Otherwise, just copy the v6 address. */
769 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
770 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
771 struct sctp_ulpevent *ev = sctp_skb2event(skb);
772 sin6->sin6_scope_id = ev->iif;
777 /* Do we support this AF? */
778 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
783 /* v4-mapped-v6 addresses */
785 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
792 /* Address matching with wildcards allowed. This extra level
793 * of indirection lets us choose whether a PF_INET6 should
794 * disallow any v4 addresses if we so choose.
796 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
797 const union sctp_addr *addr2,
798 struct sctp_sock *opt)
800 struct sctp_af *af1, *af2;
801 struct sock *sk = sctp_opt2sk(opt);
803 af1 = sctp_get_af_specific(addr1->sa.sa_family);
804 af2 = sctp_get_af_specific(addr2->sa.sa_family);
809 /* If the socket is IPv6 only, v4 addrs will not match */
810 if (__ipv6_only_sock(sk) && af1 != af2)
813 /* Today, wildcard AF_INET/AF_INET6. */
814 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
817 if (addr1->sa.sa_family != addr2->sa.sa_family)
820 return af1->cmp_addr(addr1, addr2);
823 /* Verify that the provided sockaddr looks bindable. Common verification,
824 * has already been taken care of.
826 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
830 /* ASSERT: address family has already been verified. */
831 if (addr->sa.sa_family != AF_INET6)
832 af = sctp_get_af_specific(addr->sa.sa_family);
834 int type = ipv6_addr_type(&addr->v6.sin6_addr);
835 struct net_device *dev;
837 if (type & IPV6_ADDR_LINKLOCAL) {
838 if (!addr->v6.sin6_scope_id)
840 dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id);
843 if (!ipv6_chk_addr(&init_net, &addr->v6.sin6_addr,
849 } else if (type == IPV6_ADDR_MAPPED) {
856 return af->available(addr, opt);
859 /* Verify that the provided sockaddr looks sendable. Common verification,
860 * has already been taken care of.
862 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
864 struct sctp_af *af = NULL;
866 /* ASSERT: address family has already been verified. */
867 if (addr->sa.sa_family != AF_INET6)
868 af = sctp_get_af_specific(addr->sa.sa_family);
870 int type = ipv6_addr_type(&addr->v6.sin6_addr);
871 struct net_device *dev;
873 if (type & IPV6_ADDR_LINKLOCAL) {
874 if (!addr->v6.sin6_scope_id)
876 dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id);
887 /* Fill in Supported Address Type information for INIT and INIT-ACK
888 * chunks. Note: In the future, we may want to look at sock options
889 * to determine whether a PF_INET6 socket really wants to have IPV4
891 * Returns number of addresses supported.
893 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
896 types[0] = SCTP_PARAM_IPV6_ADDRESS;
897 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
898 types[1] = SCTP_PARAM_IPV4_ADDRESS;
904 static const struct proto_ops inet6_seqpacket_ops = {
906 .owner = THIS_MODULE,
907 .release = inet6_release,
909 .connect = inet_dgram_connect,
910 .socketpair = sock_no_socketpair,
911 .accept = inet_accept,
912 .getname = inet6_getname,
914 .ioctl = inet6_ioctl,
915 .listen = sctp_inet_listen,
916 .shutdown = inet_shutdown,
917 .setsockopt = sock_common_setsockopt,
918 .getsockopt = sock_common_getsockopt,
919 .sendmsg = inet_sendmsg,
920 .recvmsg = sock_common_recvmsg,
921 .mmap = sock_no_mmap,
923 .compat_setsockopt = compat_sock_common_setsockopt,
924 .compat_getsockopt = compat_sock_common_getsockopt,
928 static struct inet_protosw sctpv6_seqpacket_protosw = {
929 .type = SOCK_SEQPACKET,
930 .protocol = IPPROTO_SCTP,
931 .prot = &sctpv6_prot,
932 .ops = &inet6_seqpacket_ops,
935 .flags = SCTP_PROTOSW_FLAG
937 static struct inet_protosw sctpv6_stream_protosw = {
939 .protocol = IPPROTO_SCTP,
940 .prot = &sctpv6_prot,
941 .ops = &inet6_seqpacket_ops,
944 .flags = SCTP_PROTOSW_FLAG,
947 static int sctp6_rcv(struct sk_buff *skb)
949 return sctp_rcv(skb) ? -1 : 0;
952 static struct inet6_protocol sctpv6_protocol = {
953 .handler = sctp6_rcv,
954 .err_handler = sctp_v6_err,
955 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
958 static struct sctp_af sctp_af_inet6 = {
959 .sa_family = AF_INET6,
960 .sctp_xmit = sctp_v6_xmit,
961 .setsockopt = ipv6_setsockopt,
962 .getsockopt = ipv6_getsockopt,
963 .get_dst = sctp_v6_get_dst,
964 .get_saddr = sctp_v6_get_saddr,
965 .copy_addrlist = sctp_v6_copy_addrlist,
966 .from_skb = sctp_v6_from_skb,
967 .from_sk = sctp_v6_from_sk,
968 .to_sk_saddr = sctp_v6_to_sk_saddr,
969 .to_sk_daddr = sctp_v6_to_sk_daddr,
970 .from_addr_param = sctp_v6_from_addr_param,
971 .to_addr_param = sctp_v6_to_addr_param,
972 .dst_saddr = sctp_v6_dst_saddr,
973 .cmp_addr = sctp_v6_cmp_addr,
974 .scope = sctp_v6_scope,
975 .addr_valid = sctp_v6_addr_valid,
976 .inaddr_any = sctp_v6_inaddr_any,
977 .is_any = sctp_v6_is_any,
978 .available = sctp_v6_available,
979 .skb_iif = sctp_v6_skb_iif,
980 .is_ce = sctp_v6_is_ce,
981 .seq_dump_addr = sctp_v6_seq_dump_addr,
982 .ecn_capable = sctp_v6_ecn_capable,
983 .net_header_len = sizeof(struct ipv6hdr),
984 .sockaddr_len = sizeof(struct sockaddr_in6),
986 .compat_setsockopt = compat_ipv6_setsockopt,
987 .compat_getsockopt = compat_ipv6_getsockopt,
991 static struct sctp_pf sctp_pf_inet6 = {
992 .event_msgname = sctp_inet6_event_msgname,
993 .skb_msgname = sctp_inet6_skb_msgname,
994 .af_supported = sctp_inet6_af_supported,
995 .cmp_addr = sctp_inet6_cmp_addr,
996 .bind_verify = sctp_inet6_bind_verify,
997 .send_verify = sctp_inet6_send_verify,
998 .supported_addrs = sctp_inet6_supported_addrs,
999 .create_accept_sk = sctp_v6_create_accept_sk,
1000 .addr_v4map = sctp_v6_addr_v4map,
1001 .af = &sctp_af_inet6,
1004 /* Initialize IPv6 support and register with socket layer. */
1005 void sctp_v6_pf_init(void)
1007 /* Register the SCTP specific PF_INET6 functions. */
1008 sctp_register_pf(&sctp_pf_inet6, PF_INET6);
1010 /* Register the SCTP specific AF_INET6 functions. */
1011 sctp_register_af(&sctp_af_inet6);
1014 void sctp_v6_pf_exit(void)
1016 list_del(&sctp_af_inet6.list);
1019 /* Initialize IPv6 support and register with socket layer. */
1020 int sctp_v6_protosw_init(void)
1024 rc = proto_register(&sctpv6_prot, 1);
1028 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1029 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1030 inet6_register_protosw(&sctpv6_stream_protosw);
1035 void sctp_v6_protosw_exit(void)
1037 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1038 inet6_unregister_protosw(&sctpv6_stream_protosw);
1039 proto_unregister(&sctpv6_prot);
1043 /* Register with inet6 layer. */
1044 int sctp_v6_add_protocol(void)
1046 /* Register notifier for inet6 address additions/deletions. */
1047 register_inet6addr_notifier(&sctp_inet6addr_notifier);
1049 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1055 /* Unregister with inet6 layer. */
1056 void sctp_v6_del_protocol(void)
1058 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1059 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);