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, see
25 * <http://www.gnu.org/licenses/>.
27 * Please send any bug reports or fixes you make to the
29 * lksctp developers <linux-sctp@vger.kernel.org>
31 * Written or modified by:
32 * Le Yanqun <yanqun.le@nokia.com>
33 * Hui Huang <hui.huang@nokia.com>
34 * La Monte H.P. Yarroll <piggy@acm.org>
35 * Sridhar Samudrala <sri@us.ibm.com>
36 * Jon Grimm <jgrimm@us.ibm.com>
37 * Ardelle Fan <ardelle.fan@intel.com>
40 * linux/net/ipv6/tcp_ipv6.c
43 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
45 #include <linux/module.h>
46 #include <linux/errno.h>
47 #include <linux/types.h>
48 #include <linux/socket.h>
49 #include <linux/sockios.h>
50 #include <linux/net.h>
52 #include <linux/in6.h>
53 #include <linux/netdevice.h>
54 #include <linux/init.h>
55 #include <linux/ipsec.h>
56 #include <linux/slab.h>
58 #include <linux/ipv6.h>
59 #include <linux/icmpv6.h>
60 #include <linux/random.h>
61 #include <linux/seq_file.h>
63 #include <net/protocol.h>
64 #include <net/ndisc.h>
67 #include <net/transp_v6.h>
68 #include <net/addrconf.h>
69 #include <net/ip6_route.h>
70 #include <net/inet_common.h>
71 #include <net/inet_ecn.h>
72 #include <net/sctp/sctp.h>
74 #include <linux/uaccess.h>
76 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
78 static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
80 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
81 const union sctp_addr *addr2);
83 /* Event handler for inet6 address addition/deletion events.
84 * The sctp_local_addr_list needs to be protocted by a spin lock since
85 * multiple notifiers (say IPv4 and IPv6) may be running at the same
86 * time and thus corrupt the list.
87 * The reader side is protected with RCU.
89 static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
92 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
93 struct sctp_sockaddr_entry *addr = NULL;
94 struct sctp_sockaddr_entry *temp;
95 struct net *net = dev_net(ifa->idev->dev);
100 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
102 addr->a.v6.sin6_family = AF_INET6;
103 addr->a.v6.sin6_port = 0;
104 addr->a.v6.sin6_addr = ifa->addr;
105 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
107 spin_lock_bh(&net->sctp.local_addr_lock);
108 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
109 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
110 spin_unlock_bh(&net->sctp.local_addr_lock);
114 spin_lock_bh(&net->sctp.local_addr_lock);
115 list_for_each_entry_safe(addr, temp,
116 &net->sctp.local_addr_list, list) {
117 if (addr->a.sa.sa_family == AF_INET6 &&
118 ipv6_addr_equal(&addr->a.v6.sin6_addr,
120 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
123 list_del_rcu(&addr->list);
127 spin_unlock_bh(&net->sctp.local_addr_lock);
129 kfree_rcu(addr, rcu);
136 static struct notifier_block sctp_inet6addr_notifier = {
137 .notifier_call = sctp_inet6addr_event,
140 /* ICMP error handler. */
141 static void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
142 u8 type, u8 code, int offset, __be32 info)
144 struct inet6_dev *idev;
146 struct sctp_association *asoc;
147 struct sctp_transport *transport;
148 struct ipv6_pinfo *np;
149 __u16 saveip, savesctp;
151 struct net *net = dev_net(skb->dev);
153 idev = in6_dev_get(skb->dev);
155 /* Fix up skb to look at the embedded net header. */
156 saveip = skb->network_header;
157 savesctp = skb->transport_header;
158 skb_reset_network_header(skb);
159 skb_set_transport_header(skb, offset);
160 sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
161 /* Put back, the original pointers. */
162 skb->network_header = saveip;
163 skb->transport_header = savesctp;
165 __ICMP6_INC_STATS(net, idev, ICMP6_MIB_INERRORS);
169 /* Warning: The sock lock is held. Remember to call
174 case ICMPV6_PKT_TOOBIG:
175 if (ip6_sk_accept_pmtu(sk))
176 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
178 case ICMPV6_PARAMPROB:
179 if (ICMPV6_UNK_NEXTHDR == code) {
180 sctp_icmp_proto_unreachable(sk, asoc, transport);
185 sctp_icmp_redirect(sk, transport, skb);
192 icmpv6_err_convert(type, code, &err);
193 if (!sock_owned_by_user(sk) && np->recverr) {
195 sk->sk_error_report(sk);
196 } else { /* Only an error on timeout */
197 sk->sk_err_soft = err;
201 sctp_err_finish(sk, transport);
203 if (likely(idev != NULL))
207 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
209 struct sock *sk = skb->sk;
210 struct ipv6_pinfo *np = inet6_sk(sk);
211 struct flowi6 *fl6 = &transport->fl.u.ip6;
214 pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb,
215 skb->len, &fl6->saddr, &fl6->daddr);
217 IP6_ECN_flow_xmit(sk, fl6->flowlabel);
219 if (!(transport->param_flags & SPP_PMTUD_ENABLE))
222 SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
225 res = ip6_xmit(sk, skb, fl6, sk->sk_mark, rcu_dereference(np->opt),
231 /* Returns the dst cache entry for the given source and destination ip
234 static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
235 struct flowi *fl, struct sock *sk)
237 struct sctp_association *asoc = t->asoc;
238 struct dst_entry *dst = NULL;
239 struct flowi6 *fl6 = &fl->u.ip6;
240 struct sctp_bind_addr *bp;
241 struct ipv6_pinfo *np = inet6_sk(sk);
242 struct sctp_sockaddr_entry *laddr;
243 union sctp_addr *baddr = NULL;
244 union sctp_addr *daddr = &t->ipaddr;
245 union sctp_addr dst_saddr;
246 struct in6_addr *final_p, final;
251 memset(fl6, 0, sizeof(struct flowi6));
252 fl6->daddr = daddr->v6.sin6_addr;
253 fl6->fl6_dport = daddr->v6.sin6_port;
254 fl6->flowi6_proto = IPPROTO_SCTP;
255 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
256 fl6->flowi6_oif = daddr->v6.sin6_scope_id;
258 pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr);
261 fl6->fl6_sport = htons(asoc->base.bind_addr.port);
264 fl6->saddr = saddr->v6.sin6_addr;
265 fl6->fl6_sport = saddr->v6.sin6_port;
267 pr_debug("src=%pI6 - ", &fl6->saddr);
271 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
274 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
278 bp = &asoc->base.bind_addr;
279 scope = sctp_scope(daddr);
280 /* ip6_dst_lookup has filled in the fl6->saddr for us. Check
281 * to see if we can use it.
284 /* Walk through the bind address list and look for a bind
285 * address that matches the source address of the returned dst.
287 sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
289 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
290 if (!laddr->valid || laddr->state == SCTP_ADDR_DEL ||
291 (laddr->state != SCTP_ADDR_SRC &&
292 !asoc->src_out_of_asoc_ok))
295 /* Do not compare against v4 addrs */
296 if ((laddr->a.sa.sa_family == AF_INET6) &&
297 (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
303 /* None of the bound addresses match the source address of the
304 * dst. So release it.
310 /* Walk through the bind address list and try to get the
311 * best source address for a given destination.
314 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
317 if ((laddr->state == SCTP_ADDR_SRC) &&
318 (laddr->a.sa.sa_family == AF_INET6) &&
319 (scope <= sctp_scope(&laddr->a))) {
320 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
321 if (!baddr || (matchlen < bmatchlen)) {
323 matchlen = bmatchlen;
328 fl6->saddr = baddr->v6.sin6_addr;
329 fl6->fl6_sport = baddr->v6.sin6_port;
330 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
331 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
336 if (!IS_ERR_OR_NULL(dst)) {
339 rt = (struct rt6_info *)dst;
341 t->dst_cookie = rt6_get_cookie(rt);
342 pr_debug("rt6_dst:%pI6/%d rt6_src:%pI6\n",
343 &rt->rt6i_dst.addr, rt->rt6i_dst.plen,
348 pr_debug("no route\n");
352 /* Returns the number of consecutive initial bits that match in the 2 ipv6
355 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
358 return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
361 /* Fills in the source address(saddr) based on the destination address(daddr)
362 * and asoc's bind address list.
364 static void sctp_v6_get_saddr(struct sctp_sock *sk,
365 struct sctp_transport *t,
368 struct flowi6 *fl6 = &fl->u.ip6;
369 union sctp_addr *saddr = &t->saddr;
371 pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
374 saddr->v6.sin6_family = AF_INET6;
375 saddr->v6.sin6_addr = fl6->saddr;
379 /* Make a copy of all potential local addresses. */
380 static void sctp_v6_copy_addrlist(struct list_head *addrlist,
381 struct net_device *dev)
383 struct inet6_dev *in6_dev;
384 struct inet6_ifaddr *ifp;
385 struct sctp_sockaddr_entry *addr;
388 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
393 read_lock_bh(&in6_dev->lock);
394 list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
395 /* Add the address to the local list. */
396 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
398 addr->a.v6.sin6_family = AF_INET6;
399 addr->a.v6.sin6_port = 0;
400 addr->a.v6.sin6_addr = ifp->addr;
401 addr->a.v6.sin6_scope_id = dev->ifindex;
403 INIT_LIST_HEAD(&addr->list);
404 list_add_tail(&addr->list, addrlist);
408 read_unlock_bh(&in6_dev->lock);
412 /* Initialize a sockaddr_storage from in incoming skb. */
413 static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb,
419 port = &addr->v6.sin6_port;
420 addr->v6.sin6_family = AF_INET6;
421 addr->v6.sin6_flowinfo = 0; /* FIXME */
422 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
424 /* Always called on head skb, so this is safe */
428 addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
431 addr->v6.sin6_addr = ipv6_hdr(skb)->daddr;
435 /* Initialize an sctp_addr from a socket. */
436 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
438 addr->v6.sin6_family = AF_INET6;
439 addr->v6.sin6_port = 0;
440 addr->v6.sin6_addr = sk->sk_v6_rcv_saddr;
443 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
444 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
446 if (addr->sa.sa_family == AF_INET) {
447 sk->sk_v6_rcv_saddr.s6_addr32[0] = 0;
448 sk->sk_v6_rcv_saddr.s6_addr32[1] = 0;
449 sk->sk_v6_rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
450 sk->sk_v6_rcv_saddr.s6_addr32[3] =
451 addr->v4.sin_addr.s_addr;
453 sk->sk_v6_rcv_saddr = addr->v6.sin6_addr;
457 /* Initialize sk->sk_daddr from sctp_addr. */
458 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
460 if (addr->sa.sa_family == AF_INET) {
461 sk->sk_v6_daddr.s6_addr32[0] = 0;
462 sk->sk_v6_daddr.s6_addr32[1] = 0;
463 sk->sk_v6_daddr.s6_addr32[2] = htonl(0x0000ffff);
464 sk->sk_v6_daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
466 sk->sk_v6_daddr = addr->v6.sin6_addr;
470 /* Initialize a sctp_addr from an address parameter. */
471 static void sctp_v6_from_addr_param(union sctp_addr *addr,
472 union sctp_addr_param *param,
473 __be16 port, int iif)
475 addr->v6.sin6_family = AF_INET6;
476 addr->v6.sin6_port = port;
477 addr->v6.sin6_flowinfo = 0; /* BUG */
478 addr->v6.sin6_addr = param->v6.addr;
479 addr->v6.sin6_scope_id = iif;
482 /* Initialize an address parameter from a sctp_addr and return the length
483 * of the address parameter.
485 static int sctp_v6_to_addr_param(const union sctp_addr *addr,
486 union sctp_addr_param *param)
488 int length = sizeof(sctp_ipv6addr_param_t);
490 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
491 param->v6.param_hdr.length = htons(length);
492 param->v6.addr = addr->v6.sin6_addr;
497 /* Initialize a sctp_addr from struct in6_addr. */
498 static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
501 addr->sa.sa_family = AF_INET6;
502 addr->v6.sin6_port = port;
503 addr->v6.sin6_addr = *saddr;
506 /* Compare addresses exactly.
507 * v4-mapped-v6 is also in consideration.
509 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
510 const union sctp_addr *addr2)
512 if (addr1->sa.sa_family != addr2->sa.sa_family) {
513 if (addr1->sa.sa_family == AF_INET &&
514 addr2->sa.sa_family == AF_INET6 &&
515 ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) {
516 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
517 addr2->v6.sin6_addr.s6_addr32[3] ==
518 addr1->v4.sin_addr.s_addr)
521 if (addr2->sa.sa_family == AF_INET &&
522 addr1->sa.sa_family == AF_INET6 &&
523 ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) {
524 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
525 addr1->v6.sin6_addr.s6_addr32[3] ==
526 addr2->v4.sin_addr.s_addr)
531 if (addr1->v6.sin6_port != addr2->v6.sin6_port)
533 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
535 /* If this is a linklocal address, compare the scope_id. */
536 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
537 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
538 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
546 /* Initialize addr struct to INADDR_ANY. */
547 static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
549 memset(addr, 0x00, sizeof(union sctp_addr));
550 addr->v6.sin6_family = AF_INET6;
551 addr->v6.sin6_port = port;
554 /* Is this a wildcard address? */
555 static int sctp_v6_is_any(const union sctp_addr *addr)
557 return ipv6_addr_any(&addr->v6.sin6_addr);
560 /* Should this be available for binding? */
561 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
564 struct net *net = sock_net(&sp->inet.sk);
565 const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
567 type = ipv6_addr_type(in6);
568 if (IPV6_ADDR_ANY == type)
570 if (type == IPV6_ADDR_MAPPED) {
571 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
573 sctp_v6_map_v4(addr);
574 return sctp_get_af_specific(AF_INET)->available(addr, sp);
576 if (!(type & IPV6_ADDR_UNICAST))
579 return sp->inet.freebind || net->ipv6.sysctl.ip_nonlocal_bind ||
580 ipv6_chk_addr(net, in6, NULL, 0);
583 /* This function checks if the address is a valid address to be used for
587 * Return 0 - If the address is a non-unicast or an illegal address.
588 * Return 1 - If the address is a unicast.
590 static int sctp_v6_addr_valid(union sctp_addr *addr,
591 struct sctp_sock *sp,
592 const struct sk_buff *skb)
594 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
596 /* Support v4-mapped-v6 address. */
597 if (ret == IPV6_ADDR_MAPPED) {
598 /* Note: This routine is used in input, so v4-mapped-v6
599 * are disallowed here when there is no sctp_sock.
601 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
603 sctp_v6_map_v4(addr);
604 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
607 /* Is this a non-unicast address */
608 if (!(ret & IPV6_ADDR_UNICAST))
614 /* What is the scope of 'addr'? */
615 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
620 /* The IPv6 scope is really a set of bit fields.
621 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
624 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
627 retval = SCTP_SCOPE_LOOPBACK;
630 retval = SCTP_SCOPE_LINK;
633 retval = SCTP_SCOPE_PRIVATE;
636 retval = SCTP_SCOPE_GLOBAL;
643 /* Create and initialize a new sk for the socket to be returned by accept(). */
644 static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
645 struct sctp_association *asoc)
648 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
649 struct sctp6_sock *newsctp6sk;
650 struct ipv6_txoptions *opt;
652 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot, 0);
656 sock_init_data(NULL, newsk);
658 sctp_copy_sock(newsk, sk, asoc);
659 sock_reset_flag(sk, SOCK_ZAPPED);
661 newsctp6sk = (struct sctp6_sock *)newsk;
662 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
664 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
666 newnp = inet6_sk(newsk);
668 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
671 opt = rcu_dereference(np->opt);
673 opt = ipv6_dup_options(newsk, opt);
674 RCU_INIT_POINTER(newnp->opt, opt);
677 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
680 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
682 newsk->sk_v6_rcv_saddr = sk->sk_v6_rcv_saddr;
684 sk_refcnt_debug_inc(newsk);
686 if (newsk->sk_prot->init(newsk)) {
687 sk_common_release(newsk);
695 /* Format a sockaddr for return to user space. This makes sure the return is
696 * AF_INET or AF_INET6 depending on the SCTP_I_WANT_MAPPED_V4_ADDR option.
698 static int sctp_v6_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
701 if (addr->sa.sa_family == AF_INET)
702 sctp_v4_map_v6(addr);
704 if (addr->sa.sa_family == AF_INET6 &&
705 ipv6_addr_v4mapped(&addr->v6.sin6_addr))
706 sctp_v6_map_v4(addr);
709 if (addr->sa.sa_family == AF_INET)
710 return sizeof(struct sockaddr_in);
711 return sizeof(struct sockaddr_in6);
714 /* Where did this skb come from? */
715 static int sctp_v6_skb_iif(const struct sk_buff *skb)
717 return IP6CB(skb)->iif;
720 /* Was this packet marked by Explicit Congestion Notification? */
721 static int sctp_v6_is_ce(const struct sk_buff *skb)
723 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
726 /* Dump the v6 addr to the seq file. */
727 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
729 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
732 static void sctp_v6_ecn_capable(struct sock *sk)
734 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
737 /* Initialize a PF_INET msgname from a ulpevent. */
738 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
739 char *msgname, int *addrlen)
741 union sctp_addr *addr;
742 struct sctp_association *asoc;
743 union sctp_addr *paddr;
748 addr = (union sctp_addr *)msgname;
750 paddr = &asoc->peer.primary_addr;
752 if (paddr->sa.sa_family == AF_INET) {
753 addr->v4.sin_family = AF_INET;
754 addr->v4.sin_port = htons(asoc->peer.port);
755 addr->v4.sin_addr = paddr->v4.sin_addr;
757 addr->v6.sin6_family = AF_INET6;
758 addr->v6.sin6_flowinfo = 0;
759 if (ipv6_addr_type(&paddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
760 addr->v6.sin6_scope_id = paddr->v6.sin6_scope_id;
762 addr->v6.sin6_scope_id = 0;
763 addr->v6.sin6_port = htons(asoc->peer.port);
764 addr->v6.sin6_addr = paddr->v6.sin6_addr;
767 *addrlen = sctp_v6_addr_to_user(sctp_sk(asoc->base.sk), addr);
770 /* Initialize a msg_name from an inbound skb. */
771 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
774 union sctp_addr *addr;
780 addr = (union sctp_addr *)msgname;
783 if (ip_hdr(skb)->version == 4) {
784 addr->v4.sin_family = AF_INET;
785 addr->v4.sin_port = sh->source;
786 addr->v4.sin_addr.s_addr = ip_hdr(skb)->saddr;
788 addr->v6.sin6_family = AF_INET6;
789 addr->v6.sin6_flowinfo = 0;
790 addr->v6.sin6_port = sh->source;
791 addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
792 if (ipv6_addr_type(&addr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
793 addr->v6.sin6_scope_id = sctp_v6_skb_iif(skb);
797 *addr_len = sctp_v6_addr_to_user(sctp_sk(skb->sk), addr);
800 /* Do we support this AF? */
801 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
806 /* v4-mapped-v6 addresses */
808 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
815 /* Address matching with wildcards allowed. This extra level
816 * of indirection lets us choose whether a PF_INET6 should
817 * disallow any v4 addresses if we so choose.
819 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
820 const union sctp_addr *addr2,
821 struct sctp_sock *opt)
823 struct sctp_af *af1, *af2;
824 struct sock *sk = sctp_opt2sk(opt);
826 af1 = sctp_get_af_specific(addr1->sa.sa_family);
827 af2 = sctp_get_af_specific(addr2->sa.sa_family);
832 /* If the socket is IPv6 only, v4 addrs will not match */
833 if (__ipv6_only_sock(sk) && af1 != af2)
836 /* Today, wildcard AF_INET/AF_INET6. */
837 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
840 if (addr1->sa.sa_family != addr2->sa.sa_family)
843 return af1->cmp_addr(addr1, addr2);
846 /* Verify that the provided sockaddr looks bindable. Common verification,
847 * has already been taken care of.
849 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
853 /* ASSERT: address family has already been verified. */
854 if (addr->sa.sa_family != AF_INET6)
855 af = sctp_get_af_specific(addr->sa.sa_family);
857 int type = ipv6_addr_type(&addr->v6.sin6_addr);
858 struct net_device *dev;
860 if (type & IPV6_ADDR_LINKLOCAL) {
862 if (!addr->v6.sin6_scope_id)
864 net = sock_net(&opt->inet.sk);
866 dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id);
868 !ipv6_chk_addr(net, &addr->v6.sin6_addr, dev, 0)) {
877 return af->available(addr, opt);
880 /* Verify that the provided sockaddr looks sendable. Common verification,
881 * has already been taken care of.
883 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
885 struct sctp_af *af = NULL;
887 /* ASSERT: address family has already been verified. */
888 if (addr->sa.sa_family != AF_INET6)
889 af = sctp_get_af_specific(addr->sa.sa_family);
891 int type = ipv6_addr_type(&addr->v6.sin6_addr);
892 struct net_device *dev;
894 if (type & IPV6_ADDR_LINKLOCAL) {
895 if (!addr->v6.sin6_scope_id)
898 dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk),
899 addr->v6.sin6_scope_id);
910 /* Fill in Supported Address Type information for INIT and INIT-ACK
911 * chunks. Note: In the future, we may want to look at sock options
912 * to determine whether a PF_INET6 socket really wants to have IPV4
914 * Returns number of addresses supported.
916 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
919 types[0] = SCTP_PARAM_IPV6_ADDRESS;
920 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
921 types[1] = SCTP_PARAM_IPV4_ADDRESS;
927 /* Handle SCTP_I_WANT_MAPPED_V4_ADDR for getpeername() and getsockname() */
928 static int sctp_getname(struct socket *sock, struct sockaddr *uaddr,
929 int *uaddr_len, int peer)
933 rc = inet6_getname(sock, uaddr, uaddr_len, peer);
938 *uaddr_len = sctp_v6_addr_to_user(sctp_sk(sock->sk),
939 (union sctp_addr *)uaddr);
944 static const struct proto_ops inet6_seqpacket_ops = {
946 .owner = THIS_MODULE,
947 .release = inet6_release,
949 .connect = inet_dgram_connect,
950 .socketpair = sock_no_socketpair,
951 .accept = inet_accept,
952 .getname = sctp_getname,
954 .ioctl = inet6_ioctl,
955 .listen = sctp_inet_listen,
956 .shutdown = inet_shutdown,
957 .setsockopt = sock_common_setsockopt,
958 .getsockopt = sock_common_getsockopt,
959 .sendmsg = inet_sendmsg,
960 .recvmsg = inet_recvmsg,
961 .mmap = sock_no_mmap,
963 .compat_setsockopt = compat_sock_common_setsockopt,
964 .compat_getsockopt = compat_sock_common_getsockopt,
968 static struct inet_protosw sctpv6_seqpacket_protosw = {
969 .type = SOCK_SEQPACKET,
970 .protocol = IPPROTO_SCTP,
971 .prot = &sctpv6_prot,
972 .ops = &inet6_seqpacket_ops,
973 .flags = SCTP_PROTOSW_FLAG
975 static struct inet_protosw sctpv6_stream_protosw = {
977 .protocol = IPPROTO_SCTP,
978 .prot = &sctpv6_prot,
979 .ops = &inet6_seqpacket_ops,
980 .flags = SCTP_PROTOSW_FLAG,
983 static int sctp6_rcv(struct sk_buff *skb)
985 return sctp_rcv(skb) ? -1 : 0;
988 static const struct inet6_protocol sctpv6_protocol = {
989 .handler = sctp6_rcv,
990 .err_handler = sctp_v6_err,
991 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
994 static struct sctp_af sctp_af_inet6 = {
995 .sa_family = AF_INET6,
996 .sctp_xmit = sctp_v6_xmit,
997 .setsockopt = ipv6_setsockopt,
998 .getsockopt = ipv6_getsockopt,
999 .get_dst = sctp_v6_get_dst,
1000 .get_saddr = sctp_v6_get_saddr,
1001 .copy_addrlist = sctp_v6_copy_addrlist,
1002 .from_skb = sctp_v6_from_skb,
1003 .from_sk = sctp_v6_from_sk,
1004 .from_addr_param = sctp_v6_from_addr_param,
1005 .to_addr_param = sctp_v6_to_addr_param,
1006 .cmp_addr = sctp_v6_cmp_addr,
1007 .scope = sctp_v6_scope,
1008 .addr_valid = sctp_v6_addr_valid,
1009 .inaddr_any = sctp_v6_inaddr_any,
1010 .is_any = sctp_v6_is_any,
1011 .available = sctp_v6_available,
1012 .skb_iif = sctp_v6_skb_iif,
1013 .is_ce = sctp_v6_is_ce,
1014 .seq_dump_addr = sctp_v6_seq_dump_addr,
1015 .ecn_capable = sctp_v6_ecn_capable,
1016 .net_header_len = sizeof(struct ipv6hdr),
1017 .sockaddr_len = sizeof(struct sockaddr_in6),
1018 #ifdef CONFIG_COMPAT
1019 .compat_setsockopt = compat_ipv6_setsockopt,
1020 .compat_getsockopt = compat_ipv6_getsockopt,
1024 static struct sctp_pf sctp_pf_inet6 = {
1025 .event_msgname = sctp_inet6_event_msgname,
1026 .skb_msgname = sctp_inet6_skb_msgname,
1027 .af_supported = sctp_inet6_af_supported,
1028 .cmp_addr = sctp_inet6_cmp_addr,
1029 .bind_verify = sctp_inet6_bind_verify,
1030 .send_verify = sctp_inet6_send_verify,
1031 .supported_addrs = sctp_inet6_supported_addrs,
1032 .create_accept_sk = sctp_v6_create_accept_sk,
1033 .addr_to_user = sctp_v6_addr_to_user,
1034 .to_sk_saddr = sctp_v6_to_sk_saddr,
1035 .to_sk_daddr = sctp_v6_to_sk_daddr,
1036 .af = &sctp_af_inet6,
1039 /* Initialize IPv6 support and register with socket layer. */
1040 void sctp_v6_pf_init(void)
1042 /* Register the SCTP specific PF_INET6 functions. */
1043 sctp_register_pf(&sctp_pf_inet6, PF_INET6);
1045 /* Register the SCTP specific AF_INET6 functions. */
1046 sctp_register_af(&sctp_af_inet6);
1049 void sctp_v6_pf_exit(void)
1051 list_del(&sctp_af_inet6.list);
1054 /* Initialize IPv6 support and register with socket layer. */
1055 int sctp_v6_protosw_init(void)
1059 rc = proto_register(&sctpv6_prot, 1);
1063 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1064 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1065 inet6_register_protosw(&sctpv6_stream_protosw);
1070 void sctp_v6_protosw_exit(void)
1072 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1073 inet6_unregister_protosw(&sctpv6_stream_protosw);
1074 proto_unregister(&sctpv6_prot);
1078 /* Register with inet6 layer. */
1079 int sctp_v6_add_protocol(void)
1081 /* Register notifier for inet6 address additions/deletions. */
1082 register_inet6addr_notifier(&sctp_inet6addr_notifier);
1084 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1090 /* Unregister with inet6 layer. */
1091 void sctp_v6_del_protocol(void)
1093 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1094 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);