1 /* SCTP kernel reference Implementation
2 * (C) Copyright IBM Corp. 2002, 2004
3 * Copyright (c) 2001 Nokia, Inc.
4 * Copyright (c) 2001 La Monte H.P. Yarroll
5 * Copyright (c) 2002-2003 Intel Corp.
7 * This file is part of the SCTP kernel reference Implementation
11 * The SCTP reference implementation is free software;
12 * you can redistribute it and/or modify it under the terms of
13 * the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * The SCTP reference implementation is distributed in the hope that it
18 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
19 * ************************
20 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
21 * See the GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with GNU CC; see the file COPYING. If not, write to
25 * the Free Software Foundation, 59 Temple Place - Suite 330,
26 * Boston, MA 02111-1307, USA.
28 * Please send any bug reports or fixes you make to the
30 * lksctp developers <lksctp-developers@lists.sourceforge.net>
32 * Or submit a bug report through the following website:
33 * http://www.sf.net/projects/lksctp
35 * Written or modified by:
36 * Le Yanqun <yanqun.le@nokia.com>
37 * Hui Huang <hui.huang@nokia.com>
38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Sridhar Samudrala <sri@us.ibm.com>
40 * Jon Grimm <jgrimm@us.ibm.com>
41 * Ardelle Fan <ardelle.fan@intel.com>
44 * linux/net/ipv6/tcp_ipv6.c
46 * Any bugs reported given to us we will try to fix... any fixes shared will
47 * be incorporated into the next SCTP release.
50 #include <linux/module.h>
51 #include <linux/errno.h>
52 #include <linux/types.h>
53 #include <linux/socket.h>
54 #include <linux/sockios.h>
55 #include <linux/net.h>
56 #include <linux/sched.h>
58 #include <linux/in6.h>
59 #include <linux/netdevice.h>
60 #include <linux/init.h>
61 #include <linux/ipsec.h>
63 #include <linux/ipv6.h>
64 #include <linux/icmpv6.h>
65 #include <linux/random.h>
66 #include <linux/seq_file.h>
68 #include <net/protocol.h>
70 #include <net/ndisc.h>
72 #include <net/transp_v6.h>
73 #include <net/addrconf.h>
74 #include <net/ip6_route.h>
75 #include <net/inet_common.h>
76 #include <net/inet_ecn.h>
77 #include <net/sctp/sctp.h>
79 #include <asm/uaccess.h>
81 extern int sctp_inetaddr_event(struct notifier_block *, unsigned long, void *);
82 static struct notifier_block sctp_inet6addr_notifier = {
83 .notifier_call = sctp_inetaddr_event,
86 /* ICMP error handler. */
87 SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
88 int type, int code, int offset, __u32 info)
90 struct inet6_dev *idev;
91 struct ipv6hdr *iph = (struct ipv6hdr *)skb->data;
92 struct sctphdr *sh = (struct sctphdr *)(skb->data + offset);
94 struct sctp_endpoint *ep;
95 struct sctp_association *asoc;
96 struct sctp_transport *transport;
97 struct ipv6_pinfo *np;
98 char *saveip, *savesctp;
101 idev = in6_dev_get(skb->dev);
103 /* Fix up skb to look at the embedded net header. */
104 saveip = skb->nh.raw;
105 savesctp = skb->h.raw;
107 skb->h.raw = (char *)sh;
108 sk = sctp_err_lookup(AF_INET6, skb, sh, &ep, &asoc, &transport);
109 /* Put back, the original pointers. */
110 skb->nh.raw = saveip;
111 skb->h.raw = savesctp;
113 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS);
117 /* Warning: The sock lock is held. Remember to call
122 case ICMPV6_PKT_TOOBIG:
123 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
125 case ICMPV6_PARAMPROB:
126 if (ICMPV6_UNK_NEXTHDR == code) {
127 sctp_icmp_proto_unreachable(sk, ep, asoc, transport);
136 icmpv6_err_convert(type, code, &err);
137 if (!sock_owned_by_user(sk) && np->recverr) {
139 sk->sk_error_report(sk);
140 } else { /* Only an error on timeout */
141 sk->sk_err_soft = err;
145 sctp_err_finish(sk, ep, asoc);
147 if (likely(idev != NULL))
151 /* Based on tcp_v6_xmit() in tcp_ipv6.c. */
152 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport,
155 struct sock *sk = skb->sk;
156 struct ipv6_pinfo *np = inet6_sk(sk);
159 memset(&fl, 0, sizeof(fl));
161 fl.proto = sk->sk_protocol;
163 /* Fill in the dest address from the route entry passed with the skb
164 * and the source address from the transport.
166 ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr);
167 ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr);
169 fl.fl6_flowlabel = np->flow_label;
170 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
171 if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL)
172 fl.oif = transport->saddr.v6.sin6_scope_id;
174 fl.oif = sk->sk_bound_dev_if;
175 fl.fl_ip_sport = inet_sk(sk)->sport;
176 fl.fl_ip_dport = transport->ipaddr.v6.sin6_port;
178 if (np->opt && np->opt->srcrt) {
179 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
180 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
183 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
184 "src:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
185 "dst:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
186 __FUNCTION__, skb, skb->len,
187 NIP6(fl.fl6_src), NIP6(fl.fl6_dst));
189 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
191 return ip6_xmit(sk, skb, &fl, np->opt, ipfragok);
194 /* Returns the dst cache entry for the given source and destination ip
197 static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
198 union sctp_addr *daddr,
199 union sctp_addr *saddr)
201 struct dst_entry *dst;
204 memset(&fl, 0, sizeof(fl));
205 ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr);
206 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
207 fl.oif = daddr->v6.sin6_scope_id;
210 SCTP_DEBUG_PRINTK("%s: DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
211 __FUNCTION__, NIP6(fl.fl6_dst));
214 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr);
216 "SRC=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x - ",
220 dst = ip6_route_output(NULL, &fl);
223 rt = (struct rt6_info *)dst;
225 "rt6_dst:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
226 "rt6_src:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
227 NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr));
229 SCTP_DEBUG_PRINTK("NO ROUTE\n");
235 /* Returns the number of consecutive initial bits that match in the 2 ipv6
238 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
241 struct in6_addr *a1 = &s1->v6.sin6_addr;
242 struct in6_addr *a2 = &s2->v6.sin6_addr;
245 for (i = 0; i < 4 ; i++) {
248 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i];
250 if ((j = fls(ntohl(a1xora2))))
251 return (i * 32 + 32 - j);
257 /* Fills in the source address(saddr) based on the destination address(daddr)
258 * and asoc's bind address list.
260 static void sctp_v6_get_saddr(struct sctp_association *asoc,
261 struct dst_entry *dst,
262 union sctp_addr *daddr,
263 union sctp_addr *saddr)
265 struct sctp_bind_addr *bp;
267 struct sctp_sockaddr_entry *laddr;
268 struct list_head *pos;
270 union sctp_addr *baddr = NULL;
274 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
275 "daddr:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
276 __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr));
279 ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr);
280 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: "
281 "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
282 NIP6(saddr->v6.sin6_addr));
286 scope = sctp_scope(daddr);
288 bp = &asoc->base.bind_addr;
289 addr_lock = &asoc->base.addr_lock;
291 /* Go through the bind address list and find the best source address
292 * that matches the scope of the destination address.
294 sctp_read_lock(addr_lock);
295 list_for_each(pos, &bp->address_list) {
296 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
297 if ((laddr->a.sa.sa_family == AF_INET6) &&
298 (scope <= sctp_scope(&laddr->a))) {
299 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
300 if (!baddr || (matchlen < bmatchlen)) {
302 matchlen = bmatchlen;
308 memcpy(saddr, baddr, sizeof(union sctp_addr));
309 SCTP_DEBUG_PRINTK("saddr: "
310 "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
311 NIP6(saddr->v6.sin6_addr));
313 printk(KERN_ERR "%s: asoc:%p Could not find a valid source "
315 "dest:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
316 __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr));
319 sctp_read_unlock(addr_lock);
322 /* Make a copy of all potential local addresses. */
323 static void sctp_v6_copy_addrlist(struct list_head *addrlist,
324 struct net_device *dev)
326 struct inet6_dev *in6_dev;
327 struct inet6_ifaddr *ifp;
328 struct sctp_sockaddr_entry *addr;
330 read_lock(&addrconf_lock);
331 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
332 read_unlock(&addrconf_lock);
336 read_lock(&in6_dev->lock);
337 for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) {
338 /* Add the address to the local list. */
339 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
341 addr->a.v6.sin6_family = AF_INET6;
342 addr->a.v6.sin6_port = 0;
343 addr->a.v6.sin6_addr = ifp->addr;
344 addr->a.v6.sin6_scope_id = dev->ifindex;
345 INIT_LIST_HEAD(&addr->list);
346 list_add_tail(&addr->list, addrlist);
350 read_unlock(&in6_dev->lock);
351 read_unlock(&addrconf_lock);
354 /* Initialize a sockaddr_storage from in incoming skb. */
355 static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
362 port = &addr->v6.sin6_port;
363 addr->v6.sin6_family = AF_INET6;
364 addr->v6.sin6_flowinfo = 0; /* FIXME */
365 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
367 sh = (struct sctphdr *) skb->h.raw;
369 *port = ntohs(sh->source);
370 from = &skb->nh.ipv6h->saddr;
372 *port = ntohs(sh->dest);
373 from = &skb->nh.ipv6h->daddr;
375 ipv6_addr_copy(&addr->v6.sin6_addr, from);
378 /* Initialize an sctp_addr from a socket. */
379 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
381 addr->v6.sin6_family = AF_INET6;
382 addr->v6.sin6_port = inet_sk(sk)->num;
383 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
386 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
387 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
389 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
390 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
391 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
392 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
393 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
394 addr->v4.sin_addr.s_addr;
396 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
400 /* Initialize sk->sk_daddr from sctp_addr. */
401 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
403 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
404 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
405 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
406 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
407 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
409 inet6_sk(sk)->daddr = addr->v6.sin6_addr;
413 /* Initialize a sctp_addr from an address parameter. */
414 static void sctp_v6_from_addr_param(union sctp_addr *addr,
415 union sctp_addr_param *param,
418 addr->v6.sin6_family = AF_INET6;
419 addr->v6.sin6_port = port;
420 addr->v6.sin6_flowinfo = 0; /* BUG */
421 ipv6_addr_copy(&addr->v6.sin6_addr, ¶m->v6.addr);
422 addr->v6.sin6_scope_id = iif;
425 /* Initialize an address parameter from a sctp_addr and return the length
426 * of the address parameter.
428 static int sctp_v6_to_addr_param(const union sctp_addr *addr,
429 union sctp_addr_param *param)
431 int length = sizeof(sctp_ipv6addr_param_t);
433 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
434 param->v6.param_hdr.length = ntohs(length);
435 ipv6_addr_copy(¶m->v6.addr, &addr->v6.sin6_addr);
440 /* Initialize a sctp_addr from a dst_entry. */
441 static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst,
444 struct rt6_info *rt = (struct rt6_info *)dst;
445 addr->sa.sa_family = AF_INET6;
446 addr->v6.sin6_port = port;
447 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr);
450 /* Compare addresses exactly.
451 * v4-mapped-v6 is also in consideration.
453 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
454 const union sctp_addr *addr2)
456 if (addr1->sa.sa_family != addr2->sa.sa_family) {
457 if (addr1->sa.sa_family == AF_INET &&
458 addr2->sa.sa_family == AF_INET6 &&
459 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) {
460 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
461 addr2->v6.sin6_addr.s6_addr32[3] ==
462 addr1->v4.sin_addr.s_addr)
465 if (addr2->sa.sa_family == AF_INET &&
466 addr1->sa.sa_family == AF_INET6 &&
467 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) {
468 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
469 addr1->v6.sin6_addr.s6_addr32[3] ==
470 addr2->v4.sin_addr.s_addr)
475 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
477 /* If this is a linklocal address, compare the scope_id. */
478 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
479 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
480 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
488 /* Initialize addr struct to INADDR_ANY. */
489 static void sctp_v6_inaddr_any(union sctp_addr *addr, unsigned short port)
491 memset(addr, 0x00, sizeof(union sctp_addr));
492 addr->v6.sin6_family = AF_INET6;
493 addr->v6.sin6_port = port;
496 /* Is this a wildcard address? */
497 static int sctp_v6_is_any(const union sctp_addr *addr)
500 type = ipv6_addr_type((struct in6_addr *)&addr->v6.sin6_addr);
501 return IPV6_ADDR_ANY == type;
504 /* Should this be available for binding? */
505 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
508 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr;
510 type = ipv6_addr_type(in6);
511 if (IPV6_ADDR_ANY == type)
513 if (type == IPV6_ADDR_MAPPED) {
514 if (sp && !sp->v4mapped)
516 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
518 sctp_v6_map_v4(addr);
519 return sctp_get_af_specific(AF_INET)->available(addr, sp);
521 if (!(type & IPV6_ADDR_UNICAST))
524 return ipv6_chk_addr(in6, NULL, 0);
527 /* This function checks if the address is a valid address to be used for
531 * Return 0 - If the address is a non-unicast or an illegal address.
532 * Return 1 - If the address is a unicast.
534 static int sctp_v6_addr_valid(union sctp_addr *addr, struct sctp_sock *sp)
536 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
538 /* Support v4-mapped-v6 address. */
539 if (ret == IPV6_ADDR_MAPPED) {
540 /* Note: This routine is used in input, so v4-mapped-v6
541 * are disallowed here when there is no sctp_sock.
543 if (!sp || !sp->v4mapped)
545 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
547 sctp_v6_map_v4(addr);
548 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp);
551 /* Is this a non-unicast address */
552 if (!(ret & IPV6_ADDR_UNICAST))
558 /* What is the scope of 'addr'? */
559 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
564 /* The IPv6 scope is really a set of bit fields.
565 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
568 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
571 retval = SCTP_SCOPE_LOOPBACK;
574 retval = SCTP_SCOPE_LINK;
577 retval = SCTP_SCOPE_PRIVATE;
580 retval = SCTP_SCOPE_GLOBAL;
587 /* Create and initialize a new sk for the socket to be returned by accept(). */
588 static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
589 struct sctp_association *asoc)
591 struct inet_sock *inet = inet_sk(sk);
593 struct inet_sock *newinet;
594 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
595 struct sctp6_sock *newsctp6sk;
597 newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot->slab_obj_size,
602 sock_init_data(NULL, newsk);
603 sk_set_owner(newsk, THIS_MODULE);
605 newsk->sk_type = SOCK_STREAM;
607 newsk->sk_prot = sk->sk_prot;
608 newsk->sk_no_check = sk->sk_no_check;
609 newsk->sk_reuse = sk->sk_reuse;
611 newsk->sk_destruct = inet_sock_destruct;
612 newsk->sk_zapped = 0;
613 newsk->sk_family = PF_INET6;
614 newsk->sk_protocol = IPPROTO_SCTP;
615 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
616 newsk->sk_shutdown = sk->sk_shutdown;
618 newsctp6sk = (struct sctp6_sock *)newsk;
619 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
621 newinet = inet_sk(newsk);
622 newnp = inet6_sk(newsk);
624 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
626 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
629 newinet->sport = inet->sport;
630 newnp->saddr = np->saddr;
631 newnp->rcv_saddr = np->rcv_saddr;
632 newinet->dport = htons(asoc->peer.port);
633 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
635 /* Init the ipv4 part of the socket since we can have sockets
636 * using v6 API for ipv4.
638 newinet->uc_ttl = -1;
639 newinet->mc_loop = 1;
641 newinet->mc_index = 0;
642 newinet->mc_list = NULL;
644 if (ipv4_config.no_pmtu_disc)
645 newinet->pmtudisc = IP_PMTUDISC_DONT;
647 newinet->pmtudisc = IP_PMTUDISC_WANT;
649 #ifdef INET_REFCNT_DEBUG
650 atomic_inc(&inet6_sock_nr);
651 atomic_inc(&inet_sock_nr);
654 if (newsk->sk_prot->init(newsk)) {
655 sk_common_release(newsk);
663 /* Map v4 address to mapped v6 address */
664 static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
666 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
667 sctp_v4_map_v6(addr);
670 /* Where did this skb come from? */
671 static int sctp_v6_skb_iif(const struct sk_buff *skb)
673 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
677 /* Was this packet marked by Explicit Congestion Notification? */
678 static int sctp_v6_is_ce(const struct sk_buff *skb)
680 return *((__u32 *)(skb->nh.ipv6h)) & htonl(1<<20);
683 /* Dump the v6 addr to the seq file. */
684 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
686 seq_printf(seq, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
687 NIP6(addr->v6.sin6_addr));
690 /* Initialize a PF_INET6 socket msg_name. */
691 static void sctp_inet6_msgname(char *msgname, int *addr_len)
693 struct sockaddr_in6 *sin6;
695 sin6 = (struct sockaddr_in6 *)msgname;
696 sin6->sin6_family = AF_INET6;
697 sin6->sin6_flowinfo = 0;
698 sin6->sin6_scope_id = 0; /*FIXME */
699 *addr_len = sizeof(struct sockaddr_in6);
702 /* Initialize a PF_INET msgname from a ulpevent. */
703 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
704 char *msgname, int *addrlen)
706 struct sockaddr_in6 *sin6, *sin6from;
709 union sctp_addr *addr;
710 struct sctp_association *asoc;
713 sctp_inet6_msgname(msgname, addrlen);
714 sin6 = (struct sockaddr_in6 *)msgname;
715 sin6->sin6_port = htons(asoc->peer.port);
716 addr = &asoc->peer.primary_addr;
718 /* Note: If we go to a common v6 format, this code
722 /* Map ipv4 address into v4-mapped-on-v6 address. */
723 if (sctp_sk(asoc->base.sk)->v4mapped &&
724 AF_INET == addr->sa.sa_family) {
725 sctp_v4_map_v6((union sctp_addr *)sin6);
726 sin6->sin6_addr.s6_addr32[3] =
727 addr->v4.sin_addr.s_addr;
731 sin6from = &asoc->peer.primary_addr.v6;
732 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
733 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
734 sin6->sin6_scope_id = sin6from->sin6_scope_id;
738 /* Initialize a msg_name from an inbound skb. */
739 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
743 struct sockaddr_in6 *sin6;
746 sctp_inet6_msgname(msgname, addr_len);
747 sin6 = (struct sockaddr_in6 *)msgname;
748 sh = (struct sctphdr *)skb->h.raw;
749 sin6->sin6_port = sh->source;
751 /* Map ipv4 address into v4-mapped-on-v6 address. */
752 if (sctp_sk(skb->sk)->v4mapped &&
753 skb->nh.iph->version == 4) {
754 sctp_v4_map_v6((union sctp_addr *)sin6);
755 sin6->sin6_addr.s6_addr32[3] = skb->nh.iph->saddr;
759 /* Otherwise, just copy the v6 address. */
760 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
761 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
762 struct sctp_ulpevent *ev = sctp_skb2event(skb);
763 sin6->sin6_scope_id = ev->iif;
768 /* Do we support this AF? */
769 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
774 /* v4-mapped-v6 addresses */
776 if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped)
783 /* Address matching with wildcards allowed. This extra level
784 * of indirection lets us choose whether a PF_INET6 should
785 * disallow any v4 addresses if we so choose.
787 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
788 const union sctp_addr *addr2,
789 struct sctp_sock *opt)
791 struct sctp_af *af1, *af2;
793 af1 = sctp_get_af_specific(addr1->sa.sa_family);
794 af2 = sctp_get_af_specific(addr2->sa.sa_family);
798 /* Today, wildcard AF_INET/AF_INET6. */
799 if (sctp_is_any(addr1) || sctp_is_any(addr2))
802 if (addr1->sa.sa_family != addr2->sa.sa_family)
805 return af1->cmp_addr(addr1, addr2);
808 /* Verify that the provided sockaddr looks bindable. Common verification,
809 * has already been taken care of.
811 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
815 /* ASSERT: address family has already been verified. */
816 if (addr->sa.sa_family != AF_INET6)
817 af = sctp_get_af_specific(addr->sa.sa_family);
820 int type = ipv6_addr_type(&addr->v6.sin6_addr);
821 sk = sctp_opt2sk(opt);
822 if (type & IPV6_ADDR_LINKLOCAL) {
823 /* Note: Behavior similar to af_inet6.c:
824 * 1) Overrides previous bound_dev_if
825 * 2) Destructive even if bind isn't successful.
828 if (addr->v6.sin6_scope_id)
829 sk->sk_bound_dev_if = addr->v6.sin6_scope_id;
830 if (!sk->sk_bound_dev_if)
835 return af->available(addr, opt);
838 /* Verify that the provided sockaddr looks bindable. Common verification,
839 * has already been taken care of.
841 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
843 struct sctp_af *af = NULL;
845 /* ASSERT: address family has already been verified. */
846 if (addr->sa.sa_family != AF_INET6)
847 af = sctp_get_af_specific(addr->sa.sa_family);
850 int type = ipv6_addr_type(&addr->v6.sin6_addr);
851 sk = sctp_opt2sk(opt);
852 if (type & IPV6_ADDR_LINKLOCAL) {
853 /* Note: Behavior similar to af_inet6.c:
854 * 1) Overrides previous bound_dev_if
855 * 2) Destructive even if bind isn't successful.
858 if (addr->v6.sin6_scope_id)
859 sk->sk_bound_dev_if = addr->v6.sin6_scope_id;
860 if (!sk->sk_bound_dev_if)
869 /* Fill in Supported Address Type information for INIT and INIT-ACK
870 * chunks. Note: In the future, we may want to look at sock options
871 * to determine whether a PF_INET6 socket really wants to have IPV4
873 * Returns number of addresses supported.
875 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
878 types[0] = SCTP_PARAM_IPV4_ADDRESS;
879 types[1] = SCTP_PARAM_IPV6_ADDRESS;
883 static struct proto_ops inet6_seqpacket_ops = {
885 .owner = THIS_MODULE,
886 .release = inet6_release,
888 .connect = inet_dgram_connect,
889 .socketpair = sock_no_socketpair,
890 .accept = inet_accept,
891 .getname = inet6_getname,
893 .ioctl = inet6_ioctl,
894 .listen = sctp_inet_listen,
895 .shutdown = inet_shutdown,
896 .setsockopt = sock_common_setsockopt,
897 .getsockopt = sock_common_getsockopt,
898 .sendmsg = inet_sendmsg,
899 .recvmsg = sock_common_recvmsg,
900 .mmap = sock_no_mmap,
903 static struct inet_protosw sctpv6_seqpacket_protosw = {
904 .type = SOCK_SEQPACKET,
905 .protocol = IPPROTO_SCTP,
906 .prot = &sctpv6_prot,
907 .ops = &inet6_seqpacket_ops,
910 .flags = SCTP_PROTOSW_FLAG
912 static struct inet_protosw sctpv6_stream_protosw = {
914 .protocol = IPPROTO_SCTP,
915 .prot = &sctpv6_prot,
916 .ops = &inet6_seqpacket_ops,
919 .flags = SCTP_PROTOSW_FLAG,
922 static int sctp6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
924 return sctp_rcv(*pskb) ? -1 : 0;
927 static struct inet6_protocol sctpv6_protocol = {
928 .handler = sctp6_rcv,
929 .err_handler = sctp_v6_err,
930 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
933 static struct sctp_af sctp_ipv6_specific = {
934 .sctp_xmit = sctp_v6_xmit,
935 .setsockopt = ipv6_setsockopt,
936 .getsockopt = ipv6_getsockopt,
937 .get_dst = sctp_v6_get_dst,
938 .get_saddr = sctp_v6_get_saddr,
939 .copy_addrlist = sctp_v6_copy_addrlist,
940 .from_skb = sctp_v6_from_skb,
941 .from_sk = sctp_v6_from_sk,
942 .to_sk_saddr = sctp_v6_to_sk_saddr,
943 .to_sk_daddr = sctp_v6_to_sk_daddr,
944 .from_addr_param = sctp_v6_from_addr_param,
945 .to_addr_param = sctp_v6_to_addr_param,
946 .dst_saddr = sctp_v6_dst_saddr,
947 .cmp_addr = sctp_v6_cmp_addr,
948 .scope = sctp_v6_scope,
949 .addr_valid = sctp_v6_addr_valid,
950 .inaddr_any = sctp_v6_inaddr_any,
951 .is_any = sctp_v6_is_any,
952 .available = sctp_v6_available,
953 .skb_iif = sctp_v6_skb_iif,
954 .is_ce = sctp_v6_is_ce,
955 .seq_dump_addr = sctp_v6_seq_dump_addr,
956 .net_header_len = sizeof(struct ipv6hdr),
957 .sockaddr_len = sizeof(struct sockaddr_in6),
958 .sa_family = AF_INET6,
961 static struct sctp_pf sctp_pf_inet6_specific = {
962 .event_msgname = sctp_inet6_event_msgname,
963 .skb_msgname = sctp_inet6_skb_msgname,
964 .af_supported = sctp_inet6_af_supported,
965 .cmp_addr = sctp_inet6_cmp_addr,
966 .bind_verify = sctp_inet6_bind_verify,
967 .send_verify = sctp_inet6_send_verify,
968 .supported_addrs = sctp_inet6_supported_addrs,
969 .create_accept_sk = sctp_v6_create_accept_sk,
970 .addr_v4map = sctp_v6_addr_v4map,
971 .af = &sctp_ipv6_specific,
974 /* Initialize IPv6 support and register with inet6 stack. */
975 int sctp_v6_init(void)
977 int rc = sk_alloc_slab(&sctpv6_prot, "sctpv6_sock");
981 /* Register inet6 protocol. */
983 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
984 goto out_sctp_free_slab;
986 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
987 inet6_register_protosw(&sctpv6_seqpacket_protosw);
988 inet6_register_protosw(&sctpv6_stream_protosw);
990 /* Register the SCTP specific PF_INET6 functions. */
991 sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6);
993 /* Register the SCTP specific AF_INET6 functions. */
994 sctp_register_af(&sctp_ipv6_specific);
996 /* Register notifier for inet6 address additions/deletions. */
997 register_inet6addr_notifier(&sctp_inet6addr_notifier);
1002 sk_free_slab(&sctpv6_prot);
1006 /* IPv6 specific exit support. */
1007 void sctp_v6_exit(void)
1009 list_del(&sctp_ipv6_specific.list);
1010 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1011 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1012 inet6_unregister_protosw(&sctpv6_stream_protosw);
1013 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
1014 sk_free_slab(&sctpv6_prot);