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 <asm/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_BH(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
, asoc
);
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
, rcu_dereference(np
->opt
), np
->tclass
);
230 /* Returns the dst cache entry for the given source and destination ip
233 static void sctp_v6_get_dst(struct sctp_transport
*t
, union sctp_addr
*saddr
,
234 struct flowi
*fl
, struct sock
*sk
)
236 struct sctp_association
*asoc
= t
->asoc
;
237 struct dst_entry
*dst
= NULL
;
238 struct flowi6
*fl6
= &fl
->u
.ip6
;
239 struct sctp_bind_addr
*bp
;
240 struct ipv6_pinfo
*np
= inet6_sk(sk
);
241 struct sctp_sockaddr_entry
*laddr
;
242 union sctp_addr
*baddr
= NULL
;
243 union sctp_addr
*daddr
= &t
->ipaddr
;
244 union sctp_addr dst_saddr
;
245 struct in6_addr
*final_p
, final
;
250 memset(fl6
, 0, sizeof(struct flowi6
));
251 fl6
->daddr
= daddr
->v6
.sin6_addr
;
252 fl6
->fl6_dport
= daddr
->v6
.sin6_port
;
253 fl6
->flowi6_proto
= IPPROTO_SCTP
;
254 if (ipv6_addr_type(&daddr
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
255 fl6
->flowi6_oif
= daddr
->v6
.sin6_scope_id
;
257 pr_debug("%s: dst=%pI6 ", __func__
, &fl6
->daddr
);
260 fl6
->fl6_sport
= htons(asoc
->base
.bind_addr
.port
);
263 fl6
->saddr
= saddr
->v6
.sin6_addr
;
264 fl6
->fl6_sport
= saddr
->v6
.sin6_port
;
266 pr_debug("src=%pI6 - ", &fl6
->saddr
);
270 final_p
= fl6_update_dst(fl6
, rcu_dereference(np
->opt
), &final
);
273 dst
= ip6_dst_lookup_flow(sk
, fl6
, final_p
);
277 bp
= &asoc
->base
.bind_addr
;
278 scope
= sctp_scope(daddr
);
279 /* ip6_dst_lookup has filled in the fl6->saddr for us. Check
280 * to see if we can use it.
283 /* Walk through the bind address list and look for a bind
284 * address that matches the source address of the returned dst.
286 sctp_v6_to_addr(&dst_saddr
, &fl6
->saddr
, htons(bp
->port
));
288 list_for_each_entry_rcu(laddr
, &bp
->address_list
, list
) {
289 if (!laddr
->valid
|| laddr
->state
== SCTP_ADDR_DEL
||
290 (laddr
->state
!= SCTP_ADDR_SRC
&&
291 !asoc
->src_out_of_asoc_ok
))
294 /* Do not compare against v4 addrs */
295 if ((laddr
->a
.sa
.sa_family
== AF_INET6
) &&
296 (sctp_v6_cmp_addr(&dst_saddr
, &laddr
->a
))) {
302 /* None of the bound addresses match the source address of the
303 * dst. So release it.
309 /* Walk through the bind address list and try to get the
310 * best source address for a given destination.
313 list_for_each_entry_rcu(laddr
, &bp
->address_list
, list
) {
316 if ((laddr
->state
== SCTP_ADDR_SRC
) &&
317 (laddr
->a
.sa
.sa_family
== AF_INET6
) &&
318 (scope
<= sctp_scope(&laddr
->a
))) {
319 bmatchlen
= sctp_v6_addr_match_len(daddr
, &laddr
->a
);
320 if (!baddr
|| (matchlen
< bmatchlen
)) {
322 matchlen
= bmatchlen
;
327 fl6
->saddr
= baddr
->v6
.sin6_addr
;
328 fl6
->fl6_sport
= baddr
->v6
.sin6_port
;
329 final_p
= fl6_update_dst(fl6
, rcu_dereference(np
->opt
), &final
);
330 dst
= ip6_dst_lookup_flow(sk
, fl6
, final_p
);
335 if (!IS_ERR_OR_NULL(dst
)) {
338 rt
= (struct rt6_info
*)dst
;
340 t
->dst_cookie
= rt6_get_cookie(rt
);
341 pr_debug("rt6_dst:%pI6/%d rt6_src:%pI6\n",
342 &rt
->rt6i_dst
.addr
, rt
->rt6i_dst
.plen
,
347 pr_debug("no route\n");
351 /* Returns the number of consecutive initial bits that match in the 2 ipv6
354 static inline int sctp_v6_addr_match_len(union sctp_addr
*s1
,
357 return ipv6_addr_diff(&s1
->v6
.sin6_addr
, &s2
->v6
.sin6_addr
);
360 /* Fills in the source address(saddr) based on the destination address(daddr)
361 * and asoc's bind address list.
363 static void sctp_v6_get_saddr(struct sctp_sock
*sk
,
364 struct sctp_transport
*t
,
367 struct flowi6
*fl6
= &fl
->u
.ip6
;
368 union sctp_addr
*saddr
= &t
->saddr
;
370 pr_debug("%s: asoc:%p dst:%p\n", __func__
, t
->asoc
, t
->dst
);
373 saddr
->v6
.sin6_family
= AF_INET6
;
374 saddr
->v6
.sin6_addr
= fl6
->saddr
;
378 /* Make a copy of all potential local addresses. */
379 static void sctp_v6_copy_addrlist(struct list_head
*addrlist
,
380 struct net_device
*dev
)
382 struct inet6_dev
*in6_dev
;
383 struct inet6_ifaddr
*ifp
;
384 struct sctp_sockaddr_entry
*addr
;
387 if ((in6_dev
= __in6_dev_get(dev
)) == NULL
) {
392 read_lock_bh(&in6_dev
->lock
);
393 list_for_each_entry(ifp
, &in6_dev
->addr_list
, if_list
) {
394 /* Add the address to the local list. */
395 addr
= kzalloc(sizeof(*addr
), GFP_ATOMIC
);
397 addr
->a
.v6
.sin6_family
= AF_INET6
;
398 addr
->a
.v6
.sin6_port
= 0;
399 addr
->a
.v6
.sin6_addr
= ifp
->addr
;
400 addr
->a
.v6
.sin6_scope_id
= dev
->ifindex
;
402 INIT_LIST_HEAD(&addr
->list
);
403 list_add_tail(&addr
->list
, addrlist
);
407 read_unlock_bh(&in6_dev
->lock
);
411 /* Initialize a sockaddr_storage from in incoming skb. */
412 static void sctp_v6_from_skb(union sctp_addr
*addr
, struct sk_buff
*skb
,
418 port
= &addr
->v6
.sin6_port
;
419 addr
->v6
.sin6_family
= AF_INET6
;
420 addr
->v6
.sin6_flowinfo
= 0; /* FIXME */
421 addr
->v6
.sin6_scope_id
= ((struct inet6_skb_parm
*)skb
->cb
)->iif
;
426 addr
->v6
.sin6_addr
= ipv6_hdr(skb
)->saddr
;
429 addr
->v6
.sin6_addr
= ipv6_hdr(skb
)->daddr
;
433 /* Initialize an sctp_addr from a socket. */
434 static void sctp_v6_from_sk(union sctp_addr
*addr
, struct sock
*sk
)
436 addr
->v6
.sin6_family
= AF_INET6
;
437 addr
->v6
.sin6_port
= 0;
438 addr
->v6
.sin6_addr
= sk
->sk_v6_rcv_saddr
;
441 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
442 static void sctp_v6_to_sk_saddr(union sctp_addr
*addr
, struct sock
*sk
)
444 if (addr
->sa
.sa_family
== AF_INET
) {
445 sk
->sk_v6_rcv_saddr
.s6_addr32
[0] = 0;
446 sk
->sk_v6_rcv_saddr
.s6_addr32
[1] = 0;
447 sk
->sk_v6_rcv_saddr
.s6_addr32
[2] = htonl(0x0000ffff);
448 sk
->sk_v6_rcv_saddr
.s6_addr32
[3] =
449 addr
->v4
.sin_addr
.s_addr
;
451 sk
->sk_v6_rcv_saddr
= addr
->v6
.sin6_addr
;
455 /* Initialize sk->sk_daddr from sctp_addr. */
456 static void sctp_v6_to_sk_daddr(union sctp_addr
*addr
, struct sock
*sk
)
458 if (addr
->sa
.sa_family
== AF_INET
) {
459 sk
->sk_v6_daddr
.s6_addr32
[0] = 0;
460 sk
->sk_v6_daddr
.s6_addr32
[1] = 0;
461 sk
->sk_v6_daddr
.s6_addr32
[2] = htonl(0x0000ffff);
462 sk
->sk_v6_daddr
.s6_addr32
[3] = addr
->v4
.sin_addr
.s_addr
;
464 sk
->sk_v6_daddr
= addr
->v6
.sin6_addr
;
468 /* Initialize a sctp_addr from an address parameter. */
469 static void sctp_v6_from_addr_param(union sctp_addr
*addr
,
470 union sctp_addr_param
*param
,
471 __be16 port
, int iif
)
473 addr
->v6
.sin6_family
= AF_INET6
;
474 addr
->v6
.sin6_port
= port
;
475 addr
->v6
.sin6_flowinfo
= 0; /* BUG */
476 addr
->v6
.sin6_addr
= param
->v6
.addr
;
477 addr
->v6
.sin6_scope_id
= iif
;
480 /* Initialize an address parameter from a sctp_addr and return the length
481 * of the address parameter.
483 static int sctp_v6_to_addr_param(const union sctp_addr
*addr
,
484 union sctp_addr_param
*param
)
486 int length
= sizeof(sctp_ipv6addr_param_t
);
488 param
->v6
.param_hdr
.type
= SCTP_PARAM_IPV6_ADDRESS
;
489 param
->v6
.param_hdr
.length
= htons(length
);
490 param
->v6
.addr
= addr
->v6
.sin6_addr
;
495 /* Initialize a sctp_addr from struct in6_addr. */
496 static void sctp_v6_to_addr(union sctp_addr
*addr
, struct in6_addr
*saddr
,
499 addr
->sa
.sa_family
= AF_INET6
;
500 addr
->v6
.sin6_port
= port
;
501 addr
->v6
.sin6_addr
= *saddr
;
504 /* Compare addresses exactly.
505 * v4-mapped-v6 is also in consideration.
507 static int sctp_v6_cmp_addr(const union sctp_addr
*addr1
,
508 const union sctp_addr
*addr2
)
510 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
) {
511 if (addr1
->sa
.sa_family
== AF_INET
&&
512 addr2
->sa
.sa_family
== AF_INET6
&&
513 ipv6_addr_v4mapped(&addr2
->v6
.sin6_addr
)) {
514 if (addr2
->v6
.sin6_port
== addr1
->v4
.sin_port
&&
515 addr2
->v6
.sin6_addr
.s6_addr32
[3] ==
516 addr1
->v4
.sin_addr
.s_addr
)
519 if (addr2
->sa
.sa_family
== AF_INET
&&
520 addr1
->sa
.sa_family
== AF_INET6
&&
521 ipv6_addr_v4mapped(&addr1
->v6
.sin6_addr
)) {
522 if (addr1
->v6
.sin6_port
== addr2
->v4
.sin_port
&&
523 addr1
->v6
.sin6_addr
.s6_addr32
[3] ==
524 addr2
->v4
.sin_addr
.s_addr
)
529 if (!ipv6_addr_equal(&addr1
->v6
.sin6_addr
, &addr2
->v6
.sin6_addr
))
531 /* If this is a linklocal address, compare the scope_id. */
532 if (ipv6_addr_type(&addr1
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
) {
533 if (addr1
->v6
.sin6_scope_id
&& addr2
->v6
.sin6_scope_id
&&
534 (addr1
->v6
.sin6_scope_id
!= addr2
->v6
.sin6_scope_id
)) {
542 /* Initialize addr struct to INADDR_ANY. */
543 static void sctp_v6_inaddr_any(union sctp_addr
*addr
, __be16 port
)
545 memset(addr
, 0x00, sizeof(union sctp_addr
));
546 addr
->v6
.sin6_family
= AF_INET6
;
547 addr
->v6
.sin6_port
= port
;
550 /* Is this a wildcard address? */
551 static int sctp_v6_is_any(const union sctp_addr
*addr
)
553 return ipv6_addr_any(&addr
->v6
.sin6_addr
);
556 /* Should this be available for binding? */
557 static int sctp_v6_available(union sctp_addr
*addr
, struct sctp_sock
*sp
)
560 const struct in6_addr
*in6
= (const struct in6_addr
*)&addr
->v6
.sin6_addr
;
562 type
= ipv6_addr_type(in6
);
563 if (IPV6_ADDR_ANY
== type
)
565 if (type
== IPV6_ADDR_MAPPED
) {
566 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
568 sctp_v6_map_v4(addr
);
569 return sctp_get_af_specific(AF_INET
)->available(addr
, sp
);
571 if (!(type
& IPV6_ADDR_UNICAST
))
574 return ipv6_chk_addr(sock_net(&sp
->inet
.sk
), in6
, NULL
, 0);
577 /* This function checks if the address is a valid address to be used for
581 * Return 0 - If the address is a non-unicast or an illegal address.
582 * Return 1 - If the address is a unicast.
584 static int sctp_v6_addr_valid(union sctp_addr
*addr
,
585 struct sctp_sock
*sp
,
586 const struct sk_buff
*skb
)
588 int ret
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
590 /* Support v4-mapped-v6 address. */
591 if (ret
== IPV6_ADDR_MAPPED
) {
592 /* Note: This routine is used in input, so v4-mapped-v6
593 * are disallowed here when there is no sctp_sock.
595 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
597 sctp_v6_map_v4(addr
);
598 return sctp_get_af_specific(AF_INET
)->addr_valid(addr
, sp
, skb
);
601 /* Is this a non-unicast address */
602 if (!(ret
& IPV6_ADDR_UNICAST
))
608 /* What is the scope of 'addr'? */
609 static sctp_scope_t
sctp_v6_scope(union sctp_addr
*addr
)
614 /* The IPv6 scope is really a set of bit fields.
615 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
618 v6scope
= ipv6_addr_scope(&addr
->v6
.sin6_addr
);
621 retval
= SCTP_SCOPE_LOOPBACK
;
624 retval
= SCTP_SCOPE_LINK
;
627 retval
= SCTP_SCOPE_PRIVATE
;
630 retval
= SCTP_SCOPE_GLOBAL
;
637 /* Create and initialize a new sk for the socket to be returned by accept(). */
638 static struct sock
*sctp_v6_create_accept_sk(struct sock
*sk
,
639 struct sctp_association
*asoc
)
642 struct ipv6_pinfo
*newnp
, *np
= inet6_sk(sk
);
643 struct sctp6_sock
*newsctp6sk
;
644 struct ipv6_txoptions
*opt
;
646 newsk
= sk_alloc(sock_net(sk
), PF_INET6
, GFP_KERNEL
, sk
->sk_prot
, 0);
650 sock_init_data(NULL
, newsk
);
652 sctp_copy_sock(newsk
, sk
, asoc
);
653 sock_reset_flag(sk
, SOCK_ZAPPED
);
655 newsctp6sk
= (struct sctp6_sock
*)newsk
;
656 inet_sk(newsk
)->pinet6
= &newsctp6sk
->inet6
;
658 sctp_sk(newsk
)->v4mapped
= sctp_sk(sk
)->v4mapped
;
660 newnp
= inet6_sk(newsk
);
662 memcpy(newnp
, np
, sizeof(struct ipv6_pinfo
));
665 opt
= rcu_dereference(np
->opt
);
667 opt
= ipv6_dup_options(newsk
, opt
);
668 RCU_INIT_POINTER(newnp
->opt
, opt
);
671 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
674 sctp_v6_to_sk_daddr(&asoc
->peer
.primary_addr
, newsk
);
676 newsk
->sk_v6_rcv_saddr
= sk
->sk_v6_rcv_saddr
;
678 sk_refcnt_debug_inc(newsk
);
680 if (newsk
->sk_prot
->init(newsk
)) {
681 sk_common_release(newsk
);
689 /* Format a sockaddr for return to user space. This makes sure the return is
690 * AF_INET or AF_INET6 depending on the SCTP_I_WANT_MAPPED_V4_ADDR option.
692 static int sctp_v6_addr_to_user(struct sctp_sock
*sp
, union sctp_addr
*addr
)
695 if (addr
->sa
.sa_family
== AF_INET
)
696 sctp_v4_map_v6(addr
);
698 if (addr
->sa
.sa_family
== AF_INET6
&&
699 ipv6_addr_v4mapped(&addr
->v6
.sin6_addr
))
700 sctp_v6_map_v4(addr
);
703 if (addr
->sa
.sa_family
== AF_INET
)
704 return sizeof(struct sockaddr_in
);
705 return sizeof(struct sockaddr_in6
);
708 /* Where did this skb come from? */
709 static int sctp_v6_skb_iif(const struct sk_buff
*skb
)
711 struct inet6_skb_parm
*opt
= (struct inet6_skb_parm
*) skb
->cb
;
715 /* Was this packet marked by Explicit Congestion Notification? */
716 static int sctp_v6_is_ce(const struct sk_buff
*skb
)
718 return *((__u32
*)(ipv6_hdr(skb
))) & htonl(1 << 20);
721 /* Dump the v6 addr to the seq file. */
722 static void sctp_v6_seq_dump_addr(struct seq_file
*seq
, union sctp_addr
*addr
)
724 seq_printf(seq
, "%pI6 ", &addr
->v6
.sin6_addr
);
727 static void sctp_v6_ecn_capable(struct sock
*sk
)
729 inet6_sk(sk
)->tclass
|= INET_ECN_ECT_0
;
732 /* Initialize a PF_INET msgname from a ulpevent. */
733 static void sctp_inet6_event_msgname(struct sctp_ulpevent
*event
,
734 char *msgname
, int *addrlen
)
736 union sctp_addr
*addr
;
737 struct sctp_association
*asoc
;
738 union sctp_addr
*paddr
;
743 addr
= (union sctp_addr
*)msgname
;
745 paddr
= &asoc
->peer
.primary_addr
;
747 if (paddr
->sa
.sa_family
== AF_INET
) {
748 addr
->v4
.sin_family
= AF_INET
;
749 addr
->v4
.sin_port
= htons(asoc
->peer
.port
);
750 addr
->v4
.sin_addr
= paddr
->v4
.sin_addr
;
752 addr
->v6
.sin6_family
= AF_INET6
;
753 addr
->v6
.sin6_flowinfo
= 0;
754 if (ipv6_addr_type(&paddr
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
755 addr
->v6
.sin6_scope_id
= paddr
->v6
.sin6_scope_id
;
757 addr
->v6
.sin6_scope_id
= 0;
758 addr
->v6
.sin6_port
= htons(asoc
->peer
.port
);
759 addr
->v6
.sin6_addr
= paddr
->v6
.sin6_addr
;
762 *addrlen
= sctp_v6_addr_to_user(sctp_sk(asoc
->base
.sk
), addr
);
765 /* Initialize a msg_name from an inbound skb. */
766 static void sctp_inet6_skb_msgname(struct sk_buff
*skb
, char *msgname
,
769 union sctp_addr
*addr
;
775 addr
= (union sctp_addr
*)msgname
;
778 if (ip_hdr(skb
)->version
== 4) {
779 addr
->v4
.sin_family
= AF_INET
;
780 addr
->v4
.sin_port
= sh
->source
;
781 addr
->v4
.sin_addr
.s_addr
= ip_hdr(skb
)->saddr
;
783 addr
->v6
.sin6_family
= AF_INET6
;
784 addr
->v6
.sin6_flowinfo
= 0;
785 addr
->v6
.sin6_port
= sh
->source
;
786 addr
->v6
.sin6_addr
= ipv6_hdr(skb
)->saddr
;
787 if (ipv6_addr_type(&addr
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
) {
788 struct sctp_ulpevent
*ev
= sctp_skb2event(skb
);
789 addr
->v6
.sin6_scope_id
= ev
->iif
;
793 *addr_len
= sctp_v6_addr_to_user(sctp_sk(skb
->sk
), addr
);
796 /* Do we support this AF? */
797 static int sctp_inet6_af_supported(sa_family_t family
, struct sctp_sock
*sp
)
802 /* v4-mapped-v6 addresses */
804 if (!__ipv6_only_sock(sctp_opt2sk(sp
)))
811 /* Address matching with wildcards allowed. This extra level
812 * of indirection lets us choose whether a PF_INET6 should
813 * disallow any v4 addresses if we so choose.
815 static int sctp_inet6_cmp_addr(const union sctp_addr
*addr1
,
816 const union sctp_addr
*addr2
,
817 struct sctp_sock
*opt
)
819 struct sctp_af
*af1
, *af2
;
820 struct sock
*sk
= sctp_opt2sk(opt
);
822 af1
= sctp_get_af_specific(addr1
->sa
.sa_family
);
823 af2
= sctp_get_af_specific(addr2
->sa
.sa_family
);
828 /* If the socket is IPv6 only, v4 addrs will not match */
829 if (__ipv6_only_sock(sk
) && af1
!= af2
)
832 /* Today, wildcard AF_INET/AF_INET6. */
833 if (sctp_is_any(sk
, addr1
) || sctp_is_any(sk
, addr2
))
836 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
)
839 return af1
->cmp_addr(addr1
, addr2
);
842 /* Verify that the provided sockaddr looks bindable. Common verification,
843 * has already been taken care of.
845 static int sctp_inet6_bind_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
849 /* ASSERT: address family has already been verified. */
850 if (addr
->sa
.sa_family
!= AF_INET6
)
851 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
853 int type
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
854 struct net_device
*dev
;
856 if (type
& IPV6_ADDR_LINKLOCAL
) {
858 if (!addr
->v6
.sin6_scope_id
)
860 net
= sock_net(&opt
->inet
.sk
);
862 dev
= dev_get_by_index_rcu(net
, addr
->v6
.sin6_scope_id
);
864 !ipv6_chk_addr(net
, &addr
->v6
.sin6_addr
, dev
, 0)) {
873 return af
->available(addr
, opt
);
876 /* Verify that the provided sockaddr looks sendable. Common verification,
877 * has already been taken care of.
879 static int sctp_inet6_send_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
881 struct sctp_af
*af
= NULL
;
883 /* ASSERT: address family has already been verified. */
884 if (addr
->sa
.sa_family
!= AF_INET6
)
885 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
887 int type
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
888 struct net_device
*dev
;
890 if (type
& IPV6_ADDR_LINKLOCAL
) {
891 if (!addr
->v6
.sin6_scope_id
)
894 dev
= dev_get_by_index_rcu(sock_net(&opt
->inet
.sk
),
895 addr
->v6
.sin6_scope_id
);
906 /* Fill in Supported Address Type information for INIT and INIT-ACK
907 * chunks. Note: In the future, we may want to look at sock options
908 * to determine whether a PF_INET6 socket really wants to have IPV4
910 * Returns number of addresses supported.
912 static int sctp_inet6_supported_addrs(const struct sctp_sock
*opt
,
915 types
[0] = SCTP_PARAM_IPV6_ADDRESS
;
916 if (!opt
|| !ipv6_only_sock(sctp_opt2sk(opt
))) {
917 types
[1] = SCTP_PARAM_IPV4_ADDRESS
;
923 /* Handle SCTP_I_WANT_MAPPED_V4_ADDR for getpeername() and getsockname() */
924 static int sctp_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
925 int *uaddr_len
, int peer
)
929 rc
= inet6_getname(sock
, uaddr
, uaddr_len
, peer
);
934 *uaddr_len
= sctp_v6_addr_to_user(sctp_sk(sock
->sk
),
935 (union sctp_addr
*)uaddr
);
940 static const struct proto_ops inet6_seqpacket_ops
= {
942 .owner
= THIS_MODULE
,
943 .release
= inet6_release
,
945 .connect
= inet_dgram_connect
,
946 .socketpair
= sock_no_socketpair
,
947 .accept
= inet_accept
,
948 .getname
= sctp_getname
,
950 .ioctl
= inet6_ioctl
,
951 .listen
= sctp_inet_listen
,
952 .shutdown
= inet_shutdown
,
953 .setsockopt
= sock_common_setsockopt
,
954 .getsockopt
= sock_common_getsockopt
,
955 .sendmsg
= inet_sendmsg
,
956 .recvmsg
= sock_common_recvmsg
,
957 .mmap
= sock_no_mmap
,
959 .compat_setsockopt
= compat_sock_common_setsockopt
,
960 .compat_getsockopt
= compat_sock_common_getsockopt
,
964 static struct inet_protosw sctpv6_seqpacket_protosw
= {
965 .type
= SOCK_SEQPACKET
,
966 .protocol
= IPPROTO_SCTP
,
967 .prot
= &sctpv6_prot
,
968 .ops
= &inet6_seqpacket_ops
,
969 .flags
= SCTP_PROTOSW_FLAG
971 static struct inet_protosw sctpv6_stream_protosw
= {
973 .protocol
= IPPROTO_SCTP
,
974 .prot
= &sctpv6_prot
,
975 .ops
= &inet6_seqpacket_ops
,
976 .flags
= SCTP_PROTOSW_FLAG
,
979 static int sctp6_rcv(struct sk_buff
*skb
)
981 return sctp_rcv(skb
) ? -1 : 0;
984 static const struct inet6_protocol sctpv6_protocol
= {
985 .handler
= sctp6_rcv
,
986 .err_handler
= sctp_v6_err
,
987 .flags
= INET6_PROTO_NOPOLICY
| INET6_PROTO_FINAL
,
990 static struct sctp_af sctp_af_inet6
= {
991 .sa_family
= AF_INET6
,
992 .sctp_xmit
= sctp_v6_xmit
,
993 .setsockopt
= ipv6_setsockopt
,
994 .getsockopt
= ipv6_getsockopt
,
995 .get_dst
= sctp_v6_get_dst
,
996 .get_saddr
= sctp_v6_get_saddr
,
997 .copy_addrlist
= sctp_v6_copy_addrlist
,
998 .from_skb
= sctp_v6_from_skb
,
999 .from_sk
= sctp_v6_from_sk
,
1000 .from_addr_param
= sctp_v6_from_addr_param
,
1001 .to_addr_param
= sctp_v6_to_addr_param
,
1002 .cmp_addr
= sctp_v6_cmp_addr
,
1003 .scope
= sctp_v6_scope
,
1004 .addr_valid
= sctp_v6_addr_valid
,
1005 .inaddr_any
= sctp_v6_inaddr_any
,
1006 .is_any
= sctp_v6_is_any
,
1007 .available
= sctp_v6_available
,
1008 .skb_iif
= sctp_v6_skb_iif
,
1009 .is_ce
= sctp_v6_is_ce
,
1010 .seq_dump_addr
= sctp_v6_seq_dump_addr
,
1011 .ecn_capable
= sctp_v6_ecn_capable
,
1012 .net_header_len
= sizeof(struct ipv6hdr
),
1013 .sockaddr_len
= sizeof(struct sockaddr_in6
),
1014 #ifdef CONFIG_COMPAT
1015 .compat_setsockopt
= compat_ipv6_setsockopt
,
1016 .compat_getsockopt
= compat_ipv6_getsockopt
,
1020 static struct sctp_pf sctp_pf_inet6
= {
1021 .event_msgname
= sctp_inet6_event_msgname
,
1022 .skb_msgname
= sctp_inet6_skb_msgname
,
1023 .af_supported
= sctp_inet6_af_supported
,
1024 .cmp_addr
= sctp_inet6_cmp_addr
,
1025 .bind_verify
= sctp_inet6_bind_verify
,
1026 .send_verify
= sctp_inet6_send_verify
,
1027 .supported_addrs
= sctp_inet6_supported_addrs
,
1028 .create_accept_sk
= sctp_v6_create_accept_sk
,
1029 .addr_to_user
= sctp_v6_addr_to_user
,
1030 .to_sk_saddr
= sctp_v6_to_sk_saddr
,
1031 .to_sk_daddr
= sctp_v6_to_sk_daddr
,
1032 .af
= &sctp_af_inet6
,
1035 /* Initialize IPv6 support and register with socket layer. */
1036 void sctp_v6_pf_init(void)
1038 /* Register the SCTP specific PF_INET6 functions. */
1039 sctp_register_pf(&sctp_pf_inet6
, PF_INET6
);
1041 /* Register the SCTP specific AF_INET6 functions. */
1042 sctp_register_af(&sctp_af_inet6
);
1045 void sctp_v6_pf_exit(void)
1047 list_del(&sctp_af_inet6
.list
);
1050 /* Initialize IPv6 support and register with socket layer. */
1051 int sctp_v6_protosw_init(void)
1055 rc
= proto_register(&sctpv6_prot
, 1);
1059 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1060 inet6_register_protosw(&sctpv6_seqpacket_protosw
);
1061 inet6_register_protosw(&sctpv6_stream_protosw
);
1066 void sctp_v6_protosw_exit(void)
1068 inet6_unregister_protosw(&sctpv6_seqpacket_protosw
);
1069 inet6_unregister_protosw(&sctpv6_stream_protosw
);
1070 proto_unregister(&sctpv6_prot
);
1074 /* Register with inet6 layer. */
1075 int sctp_v6_add_protocol(void)
1077 /* Register notifier for inet6 address additions/deletions. */
1078 register_inet6addr_notifier(&sctp_inet6addr_notifier
);
1080 if (inet6_add_protocol(&sctpv6_protocol
, IPPROTO_SCTP
) < 0)
1086 /* Unregister with inet6 layer. */
1087 void sctp_v6_del_protocol(void)
1089 inet6_del_protocol(&sctpv6_protocol
, IPPROTO_SCTP
);
1090 unregister_inet6addr_notifier(&sctp_inet6addr_notifier
);