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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
52 #include <linux/module.h>
53 #include <linux/errno.h>
54 #include <linux/types.h>
55 #include <linux/socket.h>
56 #include <linux/sockios.h>
57 #include <linux/net.h>
59 #include <linux/in6.h>
60 #include <linux/netdevice.h>
61 #include <linux/init.h>
62 #include <linux/ipsec.h>
63 #include <linux/slab.h>
65 #include <linux/ipv6.h>
66 #include <linux/icmpv6.h>
67 #include <linux/random.h>
68 #include <linux/seq_file.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
74 #include <net/transp_v6.h>
75 #include <net/addrconf.h>
76 #include <net/ip6_route.h>
77 #include <net/inet_common.h>
78 #include <net/inet_ecn.h>
79 #include <net/sctp/sctp.h>
81 #include <asm/uaccess.h>
83 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
85 static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
87 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
88 const union sctp_addr *addr2);
90 /* Event handler for inet6 address addition/deletion events.
91 * The sctp_local_addr_list needs to be protocted by a spin lock since
92 * multiple notifiers (say IPv4 and IPv6) may be running at the same
93 * time and thus corrupt the list.
94 * The reader side is protected with RCU.
96 static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
99 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
100 struct sctp_sockaddr_entry *addr = NULL;
101 struct sctp_sockaddr_entry *temp;
106 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
108 addr->a.v6.sin6_family = AF_INET6;
109 addr->a.v6.sin6_port = 0;
110 ipv6_addr_copy(&addr->a.v6.sin6_addr, &ifa->addr);
111 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
113 spin_lock_bh(&sctp_local_addr_lock);
114 list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
115 sctp_addr_wq_mgmt(addr, SCTP_ADDR_NEW);
116 spin_unlock_bh(&sctp_local_addr_lock);
120 spin_lock_bh(&sctp_local_addr_lock);
121 list_for_each_entry_safe(addr, temp,
122 &sctp_local_addr_list, list) {
123 if (addr->a.sa.sa_family == AF_INET6 &&
124 ipv6_addr_equal(&addr->a.v6.sin6_addr,
126 sctp_addr_wq_mgmt(addr, SCTP_ADDR_DEL);
129 list_del_rcu(&addr->list);
133 spin_unlock_bh(&sctp_local_addr_lock);
135 kfree_rcu(addr, rcu);
142 static struct notifier_block sctp_inet6addr_notifier = {
143 .notifier_call = sctp_inet6addr_event,
146 /* ICMP error handler. */
147 SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
148 u8 type, u8 code, int offset, __be32 info)
150 struct inet6_dev *idev;
152 struct sctp_association *asoc;
153 struct sctp_transport *transport;
154 struct ipv6_pinfo *np;
155 sk_buff_data_t saveip, savesctp;
158 idev = in6_dev_get(skb->dev);
160 /* Fix up skb to look at the embedded net header. */
161 saveip = skb->network_header;
162 savesctp = skb->transport_header;
163 skb_reset_network_header(skb);
164 skb_set_transport_header(skb, offset);
165 sk = sctp_err_lookup(AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
166 /* Put back, the original pointers. */
167 skb->network_header = saveip;
168 skb->transport_header = savesctp;
170 ICMP6_INC_STATS_BH(dev_net(skb->dev), idev, ICMP6_MIB_INERRORS);
174 /* Warning: The sock lock is held. Remember to call
179 case ICMPV6_PKT_TOOBIG:
180 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
182 case ICMPV6_PARAMPROB:
183 if (ICMPV6_UNK_NEXTHDR == code) {
184 sctp_icmp_proto_unreachable(sk, asoc, transport);
193 icmpv6_err_convert(type, code, &err);
194 if (!sock_owned_by_user(sk) && np->recverr) {
196 sk->sk_error_report(sk);
197 } else { /* Only an error on timeout */
198 sk->sk_err_soft = err;
202 sctp_err_finish(sk, asoc);
204 if (likely(idev != NULL))
208 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
210 struct sock *sk = skb->sk;
211 struct ipv6_pinfo *np = inet6_sk(sk);
212 struct flowi6 *fl6 = &transport->fl.u.ip6;
214 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n",
215 __func__, skb, skb->len,
216 &fl6->saddr, &fl6->daddr);
218 IP6_ECN_flow_xmit(sk, fl6->flowlabel);
220 if (!(transport->param_flags & SPP_PMTUD_ENABLE))
223 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
225 return ip6_xmit(sk, skb, fl6, np->opt, np->tclass);
228 /* Returns the dst cache entry for the given source and destination ip
231 static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
232 struct flowi *fl, struct sock *sk)
234 struct sctp_association *asoc = t->asoc;
235 struct dst_entry *dst = NULL;
236 struct flowi6 *fl6 = &fl->u.ip6;
237 struct sctp_bind_addr *bp;
238 struct ipv6_pinfo *np = inet6_sk(sk);
239 struct sctp_sockaddr_entry *laddr;
240 union sctp_addr *baddr = NULL;
241 union sctp_addr *daddr = &t->ipaddr;
242 union sctp_addr dst_saddr;
243 struct in6_addr *final_p, final;
248 memset(fl6, 0, sizeof(struct flowi6));
249 ipv6_addr_copy(&fl6->daddr, &daddr->v6.sin6_addr);
250 fl6->fl6_dport = daddr->v6.sin6_port;
251 fl6->flowi6_proto = IPPROTO_SCTP;
252 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
253 fl6->flowi6_oif = daddr->v6.sin6_scope_id;
255 SCTP_DEBUG_PRINTK("%s: DST=%pI6 ", __func__, &fl6->daddr);
258 fl6->fl6_sport = htons(asoc->base.bind_addr.port);
261 ipv6_addr_copy(&fl6->saddr, &saddr->v6.sin6_addr);
262 fl6->fl6_sport = saddr->v6.sin6_port;
263 SCTP_DEBUG_PRINTK("SRC=%pI6 - ", &fl6->saddr);
266 final_p = fl6_update_dst(fl6, np->opt, &final);
267 dst = ip6_dst_lookup_flow(sk, fl6, final_p, false);
271 bp = &asoc->base.bind_addr;
272 scope = sctp_scope(daddr);
273 /* ip6_dst_lookup has filled in the fl6->saddr for us. Check
274 * to see if we can use it.
277 /* Walk through the bind address list and look for a bind
278 * address that matches the source address of the returned dst.
280 sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
282 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
283 if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC))
286 /* Do not compare against v4 addrs */
287 if ((laddr->a.sa.sa_family == AF_INET6) &&
288 (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
294 /* None of the bound addresses match the source address of the
295 * dst. So release it.
301 /* Walk through the bind address list and try to get the
302 * best source address for a given destination.
305 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
306 if (!laddr->valid && laddr->state != SCTP_ADDR_SRC)
308 if ((laddr->a.sa.sa_family == AF_INET6) &&
309 (scope <= sctp_scope(&laddr->a))) {
310 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
311 if (!baddr || (matchlen < bmatchlen)) {
313 matchlen = bmatchlen;
318 ipv6_addr_copy(&fl6->saddr, &baddr->v6.sin6_addr);
319 fl6->fl6_sport = baddr->v6.sin6_port;
320 final_p = fl6_update_dst(fl6, np->opt, &final);
321 dst = ip6_dst_lookup_flow(sk, fl6, final_p, false);
328 rt = (struct rt6_info *)dst;
330 SCTP_DEBUG_PRINTK("rt6_dst:%pI6 rt6_src:%pI6\n",
331 &rt->rt6i_dst.addr, &fl6->saddr);
334 SCTP_DEBUG_PRINTK("NO ROUTE\n");
338 /* Returns the number of consecutive initial bits that match in the 2 ipv6
341 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
344 return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
347 /* Fills in the source address(saddr) based on the destination address(daddr)
348 * and asoc's bind address list.
350 static void sctp_v6_get_saddr(struct sctp_sock *sk,
351 struct sctp_transport *t,
354 struct flowi6 *fl6 = &fl->u.ip6;
355 union sctp_addr *saddr = &t->saddr;
357 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
360 saddr->v6.sin6_family = AF_INET6;
361 ipv6_addr_copy(&saddr->v6.sin6_addr, &fl6->saddr);
365 /* Make a copy of all potential local addresses. */
366 static void sctp_v6_copy_addrlist(struct list_head *addrlist,
367 struct net_device *dev)
369 struct inet6_dev *in6_dev;
370 struct inet6_ifaddr *ifp;
371 struct sctp_sockaddr_entry *addr;
374 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
379 read_lock_bh(&in6_dev->lock);
380 list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
381 /* Add the address to the local list. */
382 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
384 addr->a.v6.sin6_family = AF_INET6;
385 addr->a.v6.sin6_port = 0;
386 ipv6_addr_copy(&addr->a.v6.sin6_addr, &ifp->addr);
387 addr->a.v6.sin6_scope_id = dev->ifindex;
389 INIT_LIST_HEAD(&addr->list);
390 list_add_tail(&addr->list, addrlist);
394 read_unlock_bh(&in6_dev->lock);
398 /* Initialize a sockaddr_storage from in incoming skb. */
399 static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
406 port = &addr->v6.sin6_port;
407 addr->v6.sin6_family = AF_INET6;
408 addr->v6.sin6_flowinfo = 0; /* FIXME */
409 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
414 from = &ipv6_hdr(skb)->saddr;
417 from = &ipv6_hdr(skb)->daddr;
419 ipv6_addr_copy(&addr->v6.sin6_addr, from);
422 /* Initialize an sctp_addr from a socket. */
423 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
425 addr->v6.sin6_family = AF_INET6;
426 addr->v6.sin6_port = 0;
427 ipv6_addr_copy(&addr->v6.sin6_addr, &inet6_sk(sk)->rcv_saddr);
430 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
431 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
433 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
434 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
435 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
436 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
437 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
438 addr->v4.sin_addr.s_addr;
440 ipv6_addr_copy(&inet6_sk(sk)->rcv_saddr, &addr->v6.sin6_addr);
444 /* Initialize sk->sk_daddr from sctp_addr. */
445 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
447 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
448 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
449 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
450 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
451 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
453 ipv6_addr_copy(&inet6_sk(sk)->daddr, &addr->v6.sin6_addr);
457 /* Initialize a sctp_addr from an address parameter. */
458 static void sctp_v6_from_addr_param(union sctp_addr *addr,
459 union sctp_addr_param *param,
460 __be16 port, int iif)
462 addr->v6.sin6_family = AF_INET6;
463 addr->v6.sin6_port = port;
464 addr->v6.sin6_flowinfo = 0; /* BUG */
465 ipv6_addr_copy(&addr->v6.sin6_addr, ¶m->v6.addr);
466 addr->v6.sin6_scope_id = iif;
469 /* Initialize an address parameter from a sctp_addr and return the length
470 * of the address parameter.
472 static int sctp_v6_to_addr_param(const union sctp_addr *addr,
473 union sctp_addr_param *param)
475 int length = sizeof(sctp_ipv6addr_param_t);
477 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
478 param->v6.param_hdr.length = htons(length);
479 ipv6_addr_copy(¶m->v6.addr, &addr->v6.sin6_addr);
484 /* Initialize a sctp_addr from struct in6_addr. */
485 static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
488 addr->sa.sa_family = AF_INET6;
489 addr->v6.sin6_port = port;
490 ipv6_addr_copy(&addr->v6.sin6_addr, saddr);
493 /* Compare addresses exactly.
494 * v4-mapped-v6 is also in consideration.
496 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
497 const union sctp_addr *addr2)
499 if (addr1->sa.sa_family != addr2->sa.sa_family) {
500 if (addr1->sa.sa_family == AF_INET &&
501 addr2->sa.sa_family == AF_INET6 &&
502 ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) {
503 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
504 addr2->v6.sin6_addr.s6_addr32[3] ==
505 addr1->v4.sin_addr.s_addr)
508 if (addr2->sa.sa_family == AF_INET &&
509 addr1->sa.sa_family == AF_INET6 &&
510 ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) {
511 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
512 addr1->v6.sin6_addr.s6_addr32[3] ==
513 addr2->v4.sin_addr.s_addr)
518 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
520 /* If this is a linklocal address, compare the scope_id. */
521 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
522 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
523 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
531 /* Initialize addr struct to INADDR_ANY. */
532 static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
534 memset(addr, 0x00, sizeof(union sctp_addr));
535 addr->v6.sin6_family = AF_INET6;
536 addr->v6.sin6_port = port;
539 /* Is this a wildcard address? */
540 static int sctp_v6_is_any(const union sctp_addr *addr)
542 return ipv6_addr_any(&addr->v6.sin6_addr);
545 /* Should this be available for binding? */
546 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
549 const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
551 type = ipv6_addr_type(in6);
552 if (IPV6_ADDR_ANY == type)
554 if (type == IPV6_ADDR_MAPPED) {
555 if (sp && !sp->v4mapped)
557 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
559 sctp_v6_map_v4(addr);
560 return sctp_get_af_specific(AF_INET)->available(addr, sp);
562 if (!(type & IPV6_ADDR_UNICAST))
565 return ipv6_chk_addr(&init_net, in6, NULL, 0);
568 /* This function checks if the address is a valid address to be used for
572 * Return 0 - If the address is a non-unicast or an illegal address.
573 * Return 1 - If the address is a unicast.
575 static int sctp_v6_addr_valid(union sctp_addr *addr,
576 struct sctp_sock *sp,
577 const struct sk_buff *skb)
579 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
581 /* Support v4-mapped-v6 address. */
582 if (ret == IPV6_ADDR_MAPPED) {
583 /* Note: This routine is used in input, so v4-mapped-v6
584 * are disallowed here when there is no sctp_sock.
586 if (!sp || !sp->v4mapped)
588 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
590 sctp_v6_map_v4(addr);
591 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
594 /* Is this a non-unicast address */
595 if (!(ret & IPV6_ADDR_UNICAST))
601 /* What is the scope of 'addr'? */
602 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
607 /* The IPv6 scope is really a set of bit fields.
608 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
611 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
614 retval = SCTP_SCOPE_LOOPBACK;
617 retval = SCTP_SCOPE_LINK;
620 retval = SCTP_SCOPE_PRIVATE;
623 retval = SCTP_SCOPE_GLOBAL;
630 /* Create and initialize a new sk for the socket to be returned by accept(). */
631 static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
632 struct sctp_association *asoc)
635 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
636 struct sctp6_sock *newsctp6sk;
637 struct ipv6_txoptions *opt;
639 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot);
643 sock_init_data(NULL, newsk);
645 sctp_copy_sock(newsk, sk, asoc);
646 sock_reset_flag(sk, SOCK_ZAPPED);
648 newsctp6sk = (struct sctp6_sock *)newsk;
649 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
651 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
653 newnp = inet6_sk(newsk);
655 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
658 opt = rcu_dereference(np->opt);
660 opt = ipv6_dup_options(newsk, opt);
661 RCU_INIT_POINTER(newnp->opt, opt);
664 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
667 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
669 sk_refcnt_debug_inc(newsk);
671 if (newsk->sk_prot->init(newsk)) {
672 sk_common_release(newsk);
680 /* Map v4 address to mapped v6 address */
681 static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
683 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
684 sctp_v4_map_v6(addr);
687 /* Where did this skb come from? */
688 static int sctp_v6_skb_iif(const struct sk_buff *skb)
690 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
694 /* Was this packet marked by Explicit Congestion Notification? */
695 static int sctp_v6_is_ce(const struct sk_buff *skb)
697 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
700 /* Dump the v6 addr to the seq file. */
701 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
703 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
706 static void sctp_v6_ecn_capable(struct sock *sk)
708 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
711 /* Initialize a PF_INET6 socket msg_name. */
712 static void sctp_inet6_msgname(char *msgname, int *addr_len)
714 struct sockaddr_in6 *sin6;
716 sin6 = (struct sockaddr_in6 *)msgname;
717 sin6->sin6_family = AF_INET6;
718 sin6->sin6_flowinfo = 0;
719 sin6->sin6_scope_id = 0; /*FIXME */
720 *addr_len = sizeof(struct sockaddr_in6);
723 /* Initialize a PF_INET msgname from a ulpevent. */
724 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
725 char *msgname, int *addrlen)
727 struct sockaddr_in6 *sin6, *sin6from;
730 union sctp_addr *addr;
731 struct sctp_association *asoc;
734 sctp_inet6_msgname(msgname, addrlen);
735 sin6 = (struct sockaddr_in6 *)msgname;
736 sin6->sin6_port = htons(asoc->peer.port);
737 addr = &asoc->peer.primary_addr;
739 /* Note: If we go to a common v6 format, this code
743 /* Map ipv4 address into v4-mapped-on-v6 address. */
744 if (sctp_sk(asoc->base.sk)->v4mapped &&
745 AF_INET == addr->sa.sa_family) {
746 sctp_v4_map_v6((union sctp_addr *)sin6);
747 sin6->sin6_addr.s6_addr32[3] =
748 addr->v4.sin_addr.s_addr;
752 sin6from = &asoc->peer.primary_addr.v6;
753 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
754 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
755 sin6->sin6_scope_id = sin6from->sin6_scope_id;
759 /* Initialize a msg_name from an inbound skb. */
760 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
764 struct sockaddr_in6 *sin6;
767 sctp_inet6_msgname(msgname, addr_len);
768 sin6 = (struct sockaddr_in6 *)msgname;
770 sin6->sin6_port = sh->source;
772 /* Map ipv4 address into v4-mapped-on-v6 address. */
773 if (sctp_sk(skb->sk)->v4mapped &&
774 ip_hdr(skb)->version == 4) {
775 sctp_v4_map_v6((union sctp_addr *)sin6);
776 sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr;
780 /* Otherwise, just copy the v6 address. */
781 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
782 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
783 struct sctp_ulpevent *ev = sctp_skb2event(skb);
784 sin6->sin6_scope_id = ev->iif;
789 /* Do we support this AF? */
790 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
795 /* v4-mapped-v6 addresses */
797 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
804 /* Address matching with wildcards allowed. This extra level
805 * of indirection lets us choose whether a PF_INET6 should
806 * disallow any v4 addresses if we so choose.
808 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
809 const union sctp_addr *addr2,
810 struct sctp_sock *opt)
812 struct sctp_af *af1, *af2;
813 struct sock *sk = sctp_opt2sk(opt);
815 af1 = sctp_get_af_specific(addr1->sa.sa_family);
816 af2 = sctp_get_af_specific(addr2->sa.sa_family);
821 /* If the socket is IPv6 only, v4 addrs will not match */
822 if (__ipv6_only_sock(sk) && af1 != af2)
825 /* Today, wildcard AF_INET/AF_INET6. */
826 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
829 if (addr1->sa.sa_family != addr2->sa.sa_family)
832 return af1->cmp_addr(addr1, addr2);
835 /* Verify that the provided sockaddr looks bindable. Common verification,
836 * has already been taken care of.
838 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
842 /* ASSERT: address family has already been verified. */
843 if (addr->sa.sa_family != AF_INET6)
844 af = sctp_get_af_specific(addr->sa.sa_family);
846 int type = ipv6_addr_type(&addr->v6.sin6_addr);
847 struct net_device *dev;
849 if (type & IPV6_ADDR_LINKLOCAL) {
850 if (!addr->v6.sin6_scope_id)
853 dev = dev_get_by_index_rcu(&init_net,
854 addr->v6.sin6_scope_id);
856 !ipv6_chk_addr(&init_net, &addr->v6.sin6_addr,
862 } else if (type == IPV6_ADDR_MAPPED) {
869 return af->available(addr, opt);
872 /* Verify that the provided sockaddr looks sendable. Common verification,
873 * has already been taken care of.
875 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
877 struct sctp_af *af = NULL;
879 /* ASSERT: address family has already been verified. */
880 if (addr->sa.sa_family != AF_INET6)
881 af = sctp_get_af_specific(addr->sa.sa_family);
883 int type = ipv6_addr_type(&addr->v6.sin6_addr);
884 struct net_device *dev;
886 if (type & IPV6_ADDR_LINKLOCAL) {
887 if (!addr->v6.sin6_scope_id)
890 dev = dev_get_by_index_rcu(&init_net,
891 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_IPV6_ADDRESS;
912 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
913 types[1] = SCTP_PARAM_IPV4_ADDRESS;
919 static const struct proto_ops inet6_seqpacket_ops = {
921 .owner = THIS_MODULE,
922 .release = inet6_release,
924 .connect = inet_dgram_connect,
925 .socketpair = sock_no_socketpair,
926 .accept = inet_accept,
927 .getname = inet6_getname,
929 .ioctl = inet6_ioctl,
930 .listen = sctp_inet_listen,
931 .shutdown = inet_shutdown,
932 .setsockopt = sock_common_setsockopt,
933 .getsockopt = sock_common_getsockopt,
934 .sendmsg = inet_sendmsg,
935 .recvmsg = sock_common_recvmsg,
936 .mmap = sock_no_mmap,
938 .compat_setsockopt = compat_sock_common_setsockopt,
939 .compat_getsockopt = compat_sock_common_getsockopt,
943 static struct inet_protosw sctpv6_seqpacket_protosw = {
944 .type = SOCK_SEQPACKET,
945 .protocol = IPPROTO_SCTP,
946 .prot = &sctpv6_prot,
947 .ops = &inet6_seqpacket_ops,
949 .flags = SCTP_PROTOSW_FLAG
951 static struct inet_protosw sctpv6_stream_protosw = {
953 .protocol = IPPROTO_SCTP,
954 .prot = &sctpv6_prot,
955 .ops = &inet6_seqpacket_ops,
957 .flags = SCTP_PROTOSW_FLAG,
960 static int sctp6_rcv(struct sk_buff *skb)
962 return sctp_rcv(skb) ? -1 : 0;
965 static const struct inet6_protocol sctpv6_protocol = {
966 .handler = sctp6_rcv,
967 .err_handler = sctp_v6_err,
968 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
971 static struct sctp_af sctp_af_inet6 = {
972 .sa_family = AF_INET6,
973 .sctp_xmit = sctp_v6_xmit,
974 .setsockopt = ipv6_setsockopt,
975 .getsockopt = ipv6_getsockopt,
976 .get_dst = sctp_v6_get_dst,
977 .get_saddr = sctp_v6_get_saddr,
978 .copy_addrlist = sctp_v6_copy_addrlist,
979 .from_skb = sctp_v6_from_skb,
980 .from_sk = sctp_v6_from_sk,
981 .to_sk_saddr = sctp_v6_to_sk_saddr,
982 .to_sk_daddr = sctp_v6_to_sk_daddr,
983 .from_addr_param = sctp_v6_from_addr_param,
984 .to_addr_param = sctp_v6_to_addr_param,
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 .ecn_capable = sctp_v6_ecn_capable,
995 .net_header_len = sizeof(struct ipv6hdr),
996 .sockaddr_len = sizeof(struct sockaddr_in6),
998 .compat_setsockopt = compat_ipv6_setsockopt,
999 .compat_getsockopt = compat_ipv6_getsockopt,
1003 static struct sctp_pf sctp_pf_inet6 = {
1004 .event_msgname = sctp_inet6_event_msgname,
1005 .skb_msgname = sctp_inet6_skb_msgname,
1006 .af_supported = sctp_inet6_af_supported,
1007 .cmp_addr = sctp_inet6_cmp_addr,
1008 .bind_verify = sctp_inet6_bind_verify,
1009 .send_verify = sctp_inet6_send_verify,
1010 .supported_addrs = sctp_inet6_supported_addrs,
1011 .create_accept_sk = sctp_v6_create_accept_sk,
1012 .addr_v4map = sctp_v6_addr_v4map,
1013 .af = &sctp_af_inet6,
1016 /* Initialize IPv6 support and register with socket layer. */
1017 void sctp_v6_pf_init(void)
1019 /* Register the SCTP specific PF_INET6 functions. */
1020 sctp_register_pf(&sctp_pf_inet6, PF_INET6);
1022 /* Register the SCTP specific AF_INET6 functions. */
1023 sctp_register_af(&sctp_af_inet6);
1026 void sctp_v6_pf_exit(void)
1028 list_del(&sctp_af_inet6.list);
1031 /* Initialize IPv6 support and register with socket layer. */
1032 int sctp_v6_protosw_init(void)
1036 rc = proto_register(&sctpv6_prot, 1);
1040 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1041 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1042 inet6_register_protosw(&sctpv6_stream_protosw);
1047 void sctp_v6_protosw_exit(void)
1049 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1050 inet6_unregister_protosw(&sctpv6_stream_protosw);
1051 proto_unregister(&sctpv6_prot);
1055 /* Register with inet6 layer. */
1056 int sctp_v6_add_protocol(void)
1058 /* Register notifier for inet6 address additions/deletions. */
1059 register_inet6addr_notifier(&sctp_inet6addr_notifier);
1061 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1067 /* Unregister with inet6 layer. */
1068 void sctp_v6_del_protocol(void)
1070 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1071 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);