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;
102 struct net *net = dev_net(ifa->idev->dev);
107 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
109 addr->a.v6.sin6_family = AF_INET6;
110 addr->a.v6.sin6_port = 0;
111 addr->a.v6.sin6_addr = ifa->addr;
112 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
114 spin_lock_bh(&net->sctp.local_addr_lock);
115 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
116 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
117 spin_unlock_bh(&net->sctp.local_addr_lock);
121 spin_lock_bh(&net->sctp.local_addr_lock);
122 list_for_each_entry_safe(addr, temp,
123 &net->sctp.local_addr_list, list) {
124 if (addr->a.sa.sa_family == AF_INET6 &&
125 ipv6_addr_equal(&addr->a.v6.sin6_addr,
127 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
130 list_del_rcu(&addr->list);
134 spin_unlock_bh(&net->sctp.local_addr_lock);
136 kfree_rcu(addr, rcu);
143 static struct notifier_block sctp_inet6addr_notifier = {
144 .notifier_call = sctp_inet6addr_event,
147 /* ICMP error handler. */
148 SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
149 u8 type, u8 code, int offset, __be32 info)
151 struct inet6_dev *idev;
153 struct sctp_association *asoc;
154 struct sctp_transport *transport;
155 struct ipv6_pinfo *np;
156 sk_buff_data_t saveip, savesctp;
158 struct net *net = dev_net(skb->dev);
160 idev = in6_dev_get(skb->dev);
162 /* Fix up skb to look at the embedded net header. */
163 saveip = skb->network_header;
164 savesctp = skb->transport_header;
165 skb_reset_network_header(skb);
166 skb_set_transport_header(skb, offset);
167 sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
168 /* Put back, the original pointers. */
169 skb->network_header = saveip;
170 skb->transport_header = savesctp;
172 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_INERRORS);
176 /* Warning: The sock lock is held. Remember to call
181 case ICMPV6_PKT_TOOBIG:
182 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
184 case ICMPV6_PARAMPROB:
185 if (ICMPV6_UNK_NEXTHDR == code) {
186 sctp_icmp_proto_unreachable(sk, asoc, transport);
191 sctp_icmp_redirect(sk, transport, skb);
198 icmpv6_err_convert(type, code, &err);
199 if (!sock_owned_by_user(sk) && np->recverr) {
201 sk->sk_error_report(sk);
202 } else { /* Only an error on timeout */
203 sk->sk_err_soft = err;
207 sctp_err_finish(sk, asoc);
209 if (likely(idev != NULL))
213 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
215 struct sock *sk = skb->sk;
216 struct ipv6_pinfo *np = inet6_sk(sk);
217 struct flowi6 *fl6 = &transport->fl.u.ip6;
219 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n",
220 __func__, skb, skb->len,
221 &fl6->saddr, &fl6->daddr);
223 IP6_ECN_flow_xmit(sk, fl6->flowlabel);
225 if (!(transport->param_flags & SPP_PMTUD_ENABLE))
228 SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
230 return ip6_xmit(sk, skb, fl6, np->opt, np->tclass);
233 /* Returns the dst cache entry for the given source and destination ip
236 static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
237 struct flowi *fl, struct sock *sk)
239 struct sctp_association *asoc = t->asoc;
240 struct dst_entry *dst = NULL;
241 struct flowi6 *fl6 = &fl->u.ip6;
242 struct sctp_bind_addr *bp;
243 struct ipv6_pinfo *np = inet6_sk(sk);
244 struct sctp_sockaddr_entry *laddr;
245 union sctp_addr *baddr = NULL;
246 union sctp_addr *daddr = &t->ipaddr;
247 union sctp_addr dst_saddr;
248 struct in6_addr *final_p, final;
253 memset(fl6, 0, sizeof(struct flowi6));
254 fl6->daddr = daddr->v6.sin6_addr;
255 fl6->fl6_dport = daddr->v6.sin6_port;
256 fl6->flowi6_proto = IPPROTO_SCTP;
257 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
258 fl6->flowi6_oif = daddr->v6.sin6_scope_id;
260 SCTP_DEBUG_PRINTK("%s: DST=%pI6 ", __func__, &fl6->daddr);
263 fl6->fl6_sport = htons(asoc->base.bind_addr.port);
266 fl6->saddr = saddr->v6.sin6_addr;
267 fl6->fl6_sport = saddr->v6.sin6_port;
268 SCTP_DEBUG_PRINTK("SRC=%pI6 - ", &fl6->saddr);
271 final_p = fl6_update_dst(fl6, np->opt, &final);
272 dst = ip6_dst_lookup_flow(sk, fl6, final_p, false);
276 bp = &asoc->base.bind_addr;
277 scope = sctp_scope(daddr);
278 /* ip6_dst_lookup has filled in the fl6->saddr for us. Check
279 * to see if we can use it.
282 /* Walk through the bind address list and look for a bind
283 * address that matches the source address of the returned dst.
285 sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
287 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
288 if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC))
291 /* Do not compare against v4 addrs */
292 if ((laddr->a.sa.sa_family == AF_INET6) &&
293 (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
299 /* None of the bound addresses match the source address of the
300 * dst. So release it.
306 /* Walk through the bind address list and try to get the
307 * best source address for a given destination.
310 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
313 if ((laddr->state == SCTP_ADDR_SRC) &&
314 (laddr->a.sa.sa_family == AF_INET6) &&
315 (scope <= sctp_scope(&laddr->a))) {
316 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
317 if (!baddr || (matchlen < bmatchlen)) {
319 matchlen = bmatchlen;
326 fl6->saddr = baddr->v6.sin6_addr;
327 fl6->fl6_sport = baddr->v6.sin6_port;
328 final_p = fl6_update_dst(fl6, np->opt, &final);
329 dst = ip6_dst_lookup_flow(sk, fl6, final_p, false);
333 if (!IS_ERR_OR_NULL(dst)) {
335 rt = (struct rt6_info *)dst;
337 SCTP_DEBUG_PRINTK("rt6_dst:%pI6 rt6_src:%pI6\n",
338 &rt->rt6i_dst.addr, &fl6->saddr);
341 SCTP_DEBUG_PRINTK("NO ROUTE\n");
345 /* Returns the number of consecutive initial bits that match in the 2 ipv6
348 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
351 return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
354 /* Fills in the source address(saddr) based on the destination address(daddr)
355 * and asoc's bind address list.
357 static void sctp_v6_get_saddr(struct sctp_sock *sk,
358 struct sctp_transport *t,
361 struct flowi6 *fl6 = &fl->u.ip6;
362 union sctp_addr *saddr = &t->saddr;
364 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
367 saddr->v6.sin6_family = AF_INET6;
368 saddr->v6.sin6_addr = fl6->saddr;
372 /* Make a copy of all potential local addresses. */
373 static void sctp_v6_copy_addrlist(struct list_head *addrlist,
374 struct net_device *dev)
376 struct inet6_dev *in6_dev;
377 struct inet6_ifaddr *ifp;
378 struct sctp_sockaddr_entry *addr;
381 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
386 read_lock_bh(&in6_dev->lock);
387 list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
388 /* Add the address to the local list. */
389 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
391 addr->a.v6.sin6_family = AF_INET6;
392 addr->a.v6.sin6_port = 0;
393 addr->a.v6.sin6_addr = ifp->addr;
394 addr->a.v6.sin6_scope_id = dev->ifindex;
396 INIT_LIST_HEAD(&addr->list);
397 list_add_tail(&addr->list, addrlist);
401 read_unlock_bh(&in6_dev->lock);
405 /* Initialize a sockaddr_storage from in incoming skb. */
406 static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
412 port = &addr->v6.sin6_port;
413 addr->v6.sin6_family = AF_INET6;
414 addr->v6.sin6_flowinfo = 0; /* FIXME */
415 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
420 addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
423 addr->v6.sin6_addr = ipv6_hdr(skb)->daddr;
427 /* Initialize an sctp_addr from a socket. */
428 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
430 addr->v6.sin6_family = AF_INET6;
431 addr->v6.sin6_port = 0;
432 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
435 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
436 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
438 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
439 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
440 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
441 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
442 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
443 addr->v4.sin_addr.s_addr;
445 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
449 /* Initialize sk->sk_daddr from sctp_addr. */
450 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
452 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
453 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
454 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
455 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
456 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
458 inet6_sk(sk)->daddr = addr->v6.sin6_addr;
462 /* Initialize a sctp_addr from an address parameter. */
463 static void sctp_v6_from_addr_param(union sctp_addr *addr,
464 union sctp_addr_param *param,
465 __be16 port, int iif)
467 addr->v6.sin6_family = AF_INET6;
468 addr->v6.sin6_port = port;
469 addr->v6.sin6_flowinfo = 0; /* BUG */
470 addr->v6.sin6_addr = param->v6.addr;
471 addr->v6.sin6_scope_id = iif;
474 /* Initialize an address parameter from a sctp_addr and return the length
475 * of the address parameter.
477 static int sctp_v6_to_addr_param(const union sctp_addr *addr,
478 union sctp_addr_param *param)
480 int length = sizeof(sctp_ipv6addr_param_t);
482 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
483 param->v6.param_hdr.length = htons(length);
484 param->v6.addr = addr->v6.sin6_addr;
489 /* Initialize a sctp_addr from struct in6_addr. */
490 static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
493 addr->sa.sa_family = AF_INET6;
494 addr->v6.sin6_port = port;
495 addr->v6.sin6_addr = *saddr;
498 /* Compare addresses exactly.
499 * v4-mapped-v6 is also in consideration.
501 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
502 const union sctp_addr *addr2)
504 if (addr1->sa.sa_family != addr2->sa.sa_family) {
505 if (addr1->sa.sa_family == AF_INET &&
506 addr2->sa.sa_family == AF_INET6 &&
507 ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) {
508 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
509 addr2->v6.sin6_addr.s6_addr32[3] ==
510 addr1->v4.sin_addr.s_addr)
513 if (addr2->sa.sa_family == AF_INET &&
514 addr1->sa.sa_family == AF_INET6 &&
515 ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) {
516 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
517 addr1->v6.sin6_addr.s6_addr32[3] ==
518 addr2->v4.sin_addr.s_addr)
523 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
525 /* If this is a linklocal address, compare the scope_id. */
526 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
527 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
528 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
536 /* Initialize addr struct to INADDR_ANY. */
537 static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
539 memset(addr, 0x00, sizeof(union sctp_addr));
540 addr->v6.sin6_family = AF_INET6;
541 addr->v6.sin6_port = port;
544 /* Is this a wildcard address? */
545 static int sctp_v6_is_any(const union sctp_addr *addr)
547 return ipv6_addr_any(&addr->v6.sin6_addr);
550 /* Should this be available for binding? */
551 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
554 const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
556 type = ipv6_addr_type(in6);
557 if (IPV6_ADDR_ANY == type)
559 if (type == IPV6_ADDR_MAPPED) {
560 if (sp && !sp->v4mapped)
562 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
564 sctp_v6_map_v4(addr);
565 return sctp_get_af_specific(AF_INET)->available(addr, sp);
567 if (!(type & IPV6_ADDR_UNICAST))
570 return ipv6_chk_addr(sock_net(&sp->inet.sk), in6, NULL, 0);
573 /* This function checks if the address is a valid address to be used for
577 * Return 0 - If the address is a non-unicast or an illegal address.
578 * Return 1 - If the address is a unicast.
580 static int sctp_v6_addr_valid(union sctp_addr *addr,
581 struct sctp_sock *sp,
582 const struct sk_buff *skb)
584 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
586 /* Support v4-mapped-v6 address. */
587 if (ret == IPV6_ADDR_MAPPED) {
588 /* Note: This routine is used in input, so v4-mapped-v6
589 * are disallowed here when there is no sctp_sock.
591 if (!sp || !sp->v4mapped)
593 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
595 sctp_v6_map_v4(addr);
596 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
599 /* Is this a non-unicast address */
600 if (!(ret & IPV6_ADDR_UNICAST))
606 /* What is the scope of 'addr'? */
607 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
612 /* The IPv6 scope is really a set of bit fields.
613 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
616 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
619 retval = SCTP_SCOPE_LOOPBACK;
622 retval = SCTP_SCOPE_LINK;
625 retval = SCTP_SCOPE_PRIVATE;
628 retval = SCTP_SCOPE_GLOBAL;
635 /* Create and initialize a new sk for the socket to be returned by accept(). */
636 static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
637 struct sctp_association *asoc)
640 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
641 struct sctp6_sock *newsctp6sk;
643 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot);
647 sock_init_data(NULL, newsk);
649 sctp_copy_sock(newsk, sk, asoc);
650 sock_reset_flag(sk, SOCK_ZAPPED);
652 newsctp6sk = (struct sctp6_sock *)newsk;
653 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
655 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
657 newnp = inet6_sk(newsk);
659 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
661 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
664 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
666 sk_refcnt_debug_inc(newsk);
668 if (newsk->sk_prot->init(newsk)) {
669 sk_common_release(newsk);
677 /* Map v4 address to mapped v6 address */
678 static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
680 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
681 sctp_v4_map_v6(addr);
684 /* Where did this skb come from? */
685 static int sctp_v6_skb_iif(const struct sk_buff *skb)
687 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
691 /* Was this packet marked by Explicit Congestion Notification? */
692 static int sctp_v6_is_ce(const struct sk_buff *skb)
694 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
697 /* Dump the v6 addr to the seq file. */
698 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
700 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
703 static void sctp_v6_ecn_capable(struct sock *sk)
705 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
708 /* Initialize a PF_INET6 socket msg_name. */
709 static void sctp_inet6_msgname(char *msgname, int *addr_len)
711 struct sockaddr_in6 *sin6;
713 sin6 = (struct sockaddr_in6 *)msgname;
714 sin6->sin6_family = AF_INET6;
715 sin6->sin6_flowinfo = 0;
716 sin6->sin6_scope_id = 0; /*FIXME */
717 *addr_len = sizeof(struct sockaddr_in6);
720 /* Initialize a PF_INET msgname from a ulpevent. */
721 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
722 char *msgname, int *addrlen)
724 struct sockaddr_in6 *sin6, *sin6from;
727 union sctp_addr *addr;
728 struct sctp_association *asoc;
731 sctp_inet6_msgname(msgname, addrlen);
732 sin6 = (struct sockaddr_in6 *)msgname;
733 sin6->sin6_port = htons(asoc->peer.port);
734 addr = &asoc->peer.primary_addr;
736 /* Note: If we go to a common v6 format, this code
740 /* Map ipv4 address into v4-mapped-on-v6 address. */
741 if (sctp_sk(asoc->base.sk)->v4mapped &&
742 AF_INET == addr->sa.sa_family) {
743 sctp_v4_map_v6((union sctp_addr *)sin6);
744 sin6->sin6_addr.s6_addr32[3] =
745 addr->v4.sin_addr.s_addr;
749 sin6from = &asoc->peer.primary_addr.v6;
750 sin6->sin6_addr = sin6from->sin6_addr;
751 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
752 sin6->sin6_scope_id = sin6from->sin6_scope_id;
756 /* Initialize a msg_name from an inbound skb. */
757 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
761 struct sockaddr_in6 *sin6;
764 sctp_inet6_msgname(msgname, addr_len);
765 sin6 = (struct sockaddr_in6 *)msgname;
767 sin6->sin6_port = sh->source;
769 /* Map ipv4 address into v4-mapped-on-v6 address. */
770 if (sctp_sk(skb->sk)->v4mapped &&
771 ip_hdr(skb)->version == 4) {
772 sctp_v4_map_v6((union sctp_addr *)sin6);
773 sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr;
777 /* Otherwise, just copy the v6 address. */
778 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
779 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
780 struct sctp_ulpevent *ev = sctp_skb2event(skb);
781 sin6->sin6_scope_id = ev->iif;
786 /* Do we support this AF? */
787 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
792 /* v4-mapped-v6 addresses */
794 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
801 /* Address matching with wildcards allowed. This extra level
802 * of indirection lets us choose whether a PF_INET6 should
803 * disallow any v4 addresses if we so choose.
805 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
806 const union sctp_addr *addr2,
807 struct sctp_sock *opt)
809 struct sctp_af *af1, *af2;
810 struct sock *sk = sctp_opt2sk(opt);
812 af1 = sctp_get_af_specific(addr1->sa.sa_family);
813 af2 = sctp_get_af_specific(addr2->sa.sa_family);
818 /* If the socket is IPv6 only, v4 addrs will not match */
819 if (__ipv6_only_sock(sk) && af1 != af2)
822 /* Today, wildcard AF_INET/AF_INET6. */
823 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
826 if (addr1->sa.sa_family != addr2->sa.sa_family)
829 return af1->cmp_addr(addr1, addr2);
832 /* Verify that the provided sockaddr looks bindable. Common verification,
833 * has already been taken care of.
835 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
839 /* ASSERT: address family has already been verified. */
840 if (addr->sa.sa_family != AF_INET6)
841 af = sctp_get_af_specific(addr->sa.sa_family);
843 int type = ipv6_addr_type(&addr->v6.sin6_addr);
844 struct net_device *dev;
846 if (type & IPV6_ADDR_LINKLOCAL) {
848 if (!addr->v6.sin6_scope_id)
850 net = sock_net(&opt->inet.sk);
852 dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id);
854 !ipv6_chk_addr(net, &addr->v6.sin6_addr, dev, 0)) {
859 } else if (type == IPV6_ADDR_MAPPED) {
866 return af->available(addr, opt);
869 /* Verify that the provided sockaddr looks sendable. Common verification,
870 * has already been taken care of.
872 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
874 struct sctp_af *af = NULL;
876 /* ASSERT: address family has already been verified. */
877 if (addr->sa.sa_family != AF_INET6)
878 af = sctp_get_af_specific(addr->sa.sa_family);
880 int type = ipv6_addr_type(&addr->v6.sin6_addr);
881 struct net_device *dev;
883 if (type & IPV6_ADDR_LINKLOCAL) {
884 if (!addr->v6.sin6_scope_id)
887 dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk),
888 addr->v6.sin6_scope_id);
899 /* Fill in Supported Address Type information for INIT and INIT-ACK
900 * chunks. Note: In the future, we may want to look at sock options
901 * to determine whether a PF_INET6 socket really wants to have IPV4
903 * Returns number of addresses supported.
905 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
908 types[0] = SCTP_PARAM_IPV6_ADDRESS;
909 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
910 types[1] = SCTP_PARAM_IPV4_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,
946 .flags = SCTP_PROTOSW_FLAG
948 static struct inet_protosw sctpv6_stream_protosw = {
950 .protocol = IPPROTO_SCTP,
951 .prot = &sctpv6_prot,
952 .ops = &inet6_seqpacket_ops,
954 .flags = SCTP_PROTOSW_FLAG,
957 static int sctp6_rcv(struct sk_buff *skb)
959 return sctp_rcv(skb) ? -1 : 0;
962 static const struct inet6_protocol sctpv6_protocol = {
963 .handler = sctp6_rcv,
964 .err_handler = sctp_v6_err,
965 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
968 static struct sctp_af sctp_af_inet6 = {
969 .sa_family = AF_INET6,
970 .sctp_xmit = sctp_v6_xmit,
971 .setsockopt = ipv6_setsockopt,
972 .getsockopt = ipv6_getsockopt,
973 .get_dst = sctp_v6_get_dst,
974 .get_saddr = sctp_v6_get_saddr,
975 .copy_addrlist = sctp_v6_copy_addrlist,
976 .from_skb = sctp_v6_from_skb,
977 .from_sk = sctp_v6_from_sk,
978 .to_sk_saddr = sctp_v6_to_sk_saddr,
979 .to_sk_daddr = sctp_v6_to_sk_daddr,
980 .from_addr_param = sctp_v6_from_addr_param,
981 .to_addr_param = sctp_v6_to_addr_param,
982 .cmp_addr = sctp_v6_cmp_addr,
983 .scope = sctp_v6_scope,
984 .addr_valid = sctp_v6_addr_valid,
985 .inaddr_any = sctp_v6_inaddr_any,
986 .is_any = sctp_v6_is_any,
987 .available = sctp_v6_available,
988 .skb_iif = sctp_v6_skb_iif,
989 .is_ce = sctp_v6_is_ce,
990 .seq_dump_addr = sctp_v6_seq_dump_addr,
991 .ecn_capable = sctp_v6_ecn_capable,
992 .net_header_len = sizeof(struct ipv6hdr),
993 .sockaddr_len = sizeof(struct sockaddr_in6),
995 .compat_setsockopt = compat_ipv6_setsockopt,
996 .compat_getsockopt = compat_ipv6_getsockopt,
1000 static struct sctp_pf sctp_pf_inet6 = {
1001 .event_msgname = sctp_inet6_event_msgname,
1002 .skb_msgname = sctp_inet6_skb_msgname,
1003 .af_supported = sctp_inet6_af_supported,
1004 .cmp_addr = sctp_inet6_cmp_addr,
1005 .bind_verify = sctp_inet6_bind_verify,
1006 .send_verify = sctp_inet6_send_verify,
1007 .supported_addrs = sctp_inet6_supported_addrs,
1008 .create_accept_sk = sctp_v6_create_accept_sk,
1009 .addr_v4map = sctp_v6_addr_v4map,
1010 .af = &sctp_af_inet6,
1013 /* Initialize IPv6 support and register with socket layer. */
1014 void sctp_v6_pf_init(void)
1016 /* Register the SCTP specific PF_INET6 functions. */
1017 sctp_register_pf(&sctp_pf_inet6, PF_INET6);
1019 /* Register the SCTP specific AF_INET6 functions. */
1020 sctp_register_af(&sctp_af_inet6);
1023 void sctp_v6_pf_exit(void)
1025 list_del(&sctp_af_inet6.list);
1028 /* Initialize IPv6 support and register with socket layer. */
1029 int sctp_v6_protosw_init(void)
1033 rc = proto_register(&sctpv6_prot, 1);
1037 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1038 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1039 inet6_register_protosw(&sctpv6_stream_protosw);
1044 void sctp_v6_protosw_exit(void)
1046 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1047 inet6_unregister_protosw(&sctpv6_stream_protosw);
1048 proto_unregister(&sctpv6_prot);
1052 /* Register with inet6 layer. */
1053 int sctp_v6_add_protocol(void)
1055 /* Register notifier for inet6 address additions/deletions. */
1056 register_inet6addr_notifier(&sctp_inet6addr_notifier);
1058 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1064 /* Unregister with inet6 layer. */
1065 void sctp_v6_del_protocol(void)
1067 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1068 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);