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_flowinfo
= 0;
105 addr
->a
.v6
.sin6_addr
= ifa
->addr
;
106 addr
->a
.v6
.sin6_scope_id
= ifa
->idev
->dev
->ifindex
;
108 spin_lock_bh(&net
->sctp
.local_addr_lock
);
109 list_add_tail_rcu(&addr
->list
, &net
->sctp
.local_addr_list
);
110 sctp_addr_wq_mgmt(net
, addr
, SCTP_ADDR_NEW
);
111 spin_unlock_bh(&net
->sctp
.local_addr_lock
);
115 spin_lock_bh(&net
->sctp
.local_addr_lock
);
116 list_for_each_entry_safe(addr
, temp
,
117 &net
->sctp
.local_addr_list
, list
) {
118 if (addr
->a
.sa
.sa_family
== AF_INET6
&&
119 ipv6_addr_equal(&addr
->a
.v6
.sin6_addr
,
121 sctp_addr_wq_mgmt(net
, addr
, SCTP_ADDR_DEL
);
124 list_del_rcu(&addr
->list
);
128 spin_unlock_bh(&net
->sctp
.local_addr_lock
);
130 kfree_rcu(addr
, rcu
);
137 static struct notifier_block sctp_inet6addr_notifier
= {
138 .notifier_call
= sctp_inet6addr_event
,
141 /* ICMP error handler. */
142 static void sctp_v6_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
143 u8 type
, u8 code
, int offset
, __be32 info
)
145 struct inet6_dev
*idev
;
147 struct sctp_association
*asoc
;
148 struct sctp_transport
*transport
;
149 struct ipv6_pinfo
*np
;
150 __u16 saveip
, savesctp
;
152 struct net
*net
= dev_net(skb
->dev
);
154 idev
= in6_dev_get(skb
->dev
);
156 /* Fix up skb to look at the embedded net header. */
157 saveip
= skb
->network_header
;
158 savesctp
= skb
->transport_header
;
159 skb_reset_network_header(skb
);
160 skb_set_transport_header(skb
, offset
);
161 sk
= sctp_err_lookup(net
, AF_INET6
, skb
, sctp_hdr(skb
), &asoc
, &transport
);
162 /* Put back, the original pointers. */
163 skb
->network_header
= saveip
;
164 skb
->transport_header
= savesctp
;
166 __ICMP6_INC_STATS(net
, idev
, ICMP6_MIB_INERRORS
);
170 /* Warning: The sock lock is held. Remember to call
175 case ICMPV6_PKT_TOOBIG
:
176 if (ip6_sk_accept_pmtu(sk
))
177 sctp_icmp_frag_needed(sk
, asoc
, transport
, ntohl(info
));
179 case ICMPV6_PARAMPROB
:
180 if (ICMPV6_UNK_NEXTHDR
== code
) {
181 sctp_icmp_proto_unreachable(sk
, asoc
, transport
);
186 sctp_icmp_redirect(sk
, transport
, skb
);
193 icmpv6_err_convert(type
, code
, &err
);
194 if (!sock_owned_by_user(sk
) && np
->recverr
) {
196 sk
->sk_error_report(sk
);
197 } else { /* Only an error on timeout */
198 sk
->sk_err_soft
= err
;
202 sctp_err_finish(sk
, transport
);
204 if (likely(idev
!= NULL
))
208 static int sctp_v6_xmit(struct sk_buff
*skb
, struct sctp_transport
*transport
)
210 struct sock
*sk
= skb
->sk
;
211 struct ipv6_pinfo
*np
= inet6_sk(sk
);
212 struct flowi6
*fl6
= &transport
->fl
.u
.ip6
;
215 pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__
, skb
,
216 skb
->len
, &fl6
->saddr
, &fl6
->daddr
);
218 IP6_ECN_flow_xmit(sk
, fl6
->flowlabel
);
220 if (!(transport
->param_flags
& SPP_PMTUD_ENABLE
))
223 SCTP_INC_STATS(sock_net(sk
), SCTP_MIB_OUTSCTPPACKS
);
226 res
= ip6_xmit(sk
, skb
, fl6
, sk
->sk_mark
, rcu_dereference(np
->opt
),
232 /* Returns the dst cache entry for the given source and destination ip
235 static void sctp_v6_get_dst(struct sctp_transport
*t
, union sctp_addr
*saddr
,
236 struct flowi
*fl
, struct sock
*sk
)
238 struct sctp_association
*asoc
= t
->asoc
;
239 struct dst_entry
*dst
= NULL
;
240 struct flowi6
*fl6
= &fl
->u
.ip6
;
241 struct sctp_bind_addr
*bp
;
242 struct ipv6_pinfo
*np
= inet6_sk(sk
);
243 struct sctp_sockaddr_entry
*laddr
;
244 union sctp_addr
*daddr
= &t
->ipaddr
;
245 union sctp_addr dst_saddr
;
246 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
) {
314 struct dst_entry
*bdst
;
318 laddr
->state
!= SCTP_ADDR_SRC
||
319 laddr
->a
.sa
.sa_family
!= AF_INET6
||
320 scope
> sctp_scope(&laddr
->a
))
323 fl6
->saddr
= laddr
->a
.v6
.sin6_addr
;
324 fl6
->fl6_sport
= laddr
->a
.v6
.sin6_port
;
325 final_p
= fl6_update_dst(fl6
, rcu_dereference(np
->opt
), &final
);
326 bdst
= ip6_dst_lookup_flow(sk
, fl6
, final_p
);
331 if (ipv6_chk_addr(dev_net(bdst
->dev
),
332 &laddr
->a
.v6
.sin6_addr
, bdst
->dev
, 1)) {
333 if (!IS_ERR_OR_NULL(dst
))
339 bmatchlen
= sctp_v6_addr_match_len(daddr
, &laddr
->a
);
340 if (matchlen
> bmatchlen
) {
345 if (!IS_ERR_OR_NULL(dst
))
348 matchlen
= bmatchlen
;
353 if (!IS_ERR_OR_NULL(dst
)) {
356 rt
= (struct rt6_info
*)dst
;
358 t
->dst_cookie
= rt6_get_cookie(rt
);
359 pr_debug("rt6_dst:%pI6/%d rt6_src:%pI6\n",
360 &rt
->rt6i_dst
.addr
, rt
->rt6i_dst
.plen
,
365 pr_debug("no route\n");
369 /* Returns the number of consecutive initial bits that match in the 2 ipv6
372 static inline int sctp_v6_addr_match_len(union sctp_addr
*s1
,
375 return ipv6_addr_diff(&s1
->v6
.sin6_addr
, &s2
->v6
.sin6_addr
);
378 /* Fills in the source address(saddr) based on the destination address(daddr)
379 * and asoc's bind address list.
381 static void sctp_v6_get_saddr(struct sctp_sock
*sk
,
382 struct sctp_transport
*t
,
385 struct flowi6
*fl6
= &fl
->u
.ip6
;
386 union sctp_addr
*saddr
= &t
->saddr
;
388 pr_debug("%s: asoc:%p dst:%p\n", __func__
, t
->asoc
, t
->dst
);
391 saddr
->v6
.sin6_family
= AF_INET6
;
392 saddr
->v6
.sin6_addr
= fl6
->saddr
;
396 /* Make a copy of all potential local addresses. */
397 static void sctp_v6_copy_addrlist(struct list_head
*addrlist
,
398 struct net_device
*dev
)
400 struct inet6_dev
*in6_dev
;
401 struct inet6_ifaddr
*ifp
;
402 struct sctp_sockaddr_entry
*addr
;
405 if ((in6_dev
= __in6_dev_get(dev
)) == NULL
) {
410 read_lock_bh(&in6_dev
->lock
);
411 list_for_each_entry(ifp
, &in6_dev
->addr_list
, if_list
) {
412 /* Add the address to the local list. */
413 addr
= kzalloc(sizeof(*addr
), GFP_ATOMIC
);
415 addr
->a
.v6
.sin6_family
= AF_INET6
;
416 addr
->a
.v6
.sin6_port
= 0;
417 addr
->a
.v6
.sin6_addr
= ifp
->addr
;
418 addr
->a
.v6
.sin6_scope_id
= dev
->ifindex
;
420 INIT_LIST_HEAD(&addr
->list
);
421 list_add_tail(&addr
->list
, addrlist
);
425 read_unlock_bh(&in6_dev
->lock
);
429 /* Initialize a sockaddr_storage from in incoming skb. */
430 static void sctp_v6_from_skb(union sctp_addr
*addr
, struct sk_buff
*skb
,
436 port
= &addr
->v6
.sin6_port
;
437 addr
->v6
.sin6_family
= AF_INET6
;
438 addr
->v6
.sin6_flowinfo
= 0; /* FIXME */
439 addr
->v6
.sin6_scope_id
= ((struct inet6_skb_parm
*)skb
->cb
)->iif
;
441 /* Always called on head skb, so this is safe */
445 addr
->v6
.sin6_addr
= ipv6_hdr(skb
)->saddr
;
448 addr
->v6
.sin6_addr
= ipv6_hdr(skb
)->daddr
;
452 /* Initialize an sctp_addr from a socket. */
453 static void sctp_v6_from_sk(union sctp_addr
*addr
, struct sock
*sk
)
455 addr
->v6
.sin6_family
= AF_INET6
;
456 addr
->v6
.sin6_port
= 0;
457 addr
->v6
.sin6_addr
= sk
->sk_v6_rcv_saddr
;
460 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
461 static void sctp_v6_to_sk_saddr(union sctp_addr
*addr
, struct sock
*sk
)
463 if (addr
->sa
.sa_family
== AF_INET
) {
464 sk
->sk_v6_rcv_saddr
.s6_addr32
[0] = 0;
465 sk
->sk_v6_rcv_saddr
.s6_addr32
[1] = 0;
466 sk
->sk_v6_rcv_saddr
.s6_addr32
[2] = htonl(0x0000ffff);
467 sk
->sk_v6_rcv_saddr
.s6_addr32
[3] =
468 addr
->v4
.sin_addr
.s_addr
;
470 sk
->sk_v6_rcv_saddr
= addr
->v6
.sin6_addr
;
474 /* Initialize sk->sk_daddr from sctp_addr. */
475 static void sctp_v6_to_sk_daddr(union sctp_addr
*addr
, struct sock
*sk
)
477 if (addr
->sa
.sa_family
== AF_INET
) {
478 sk
->sk_v6_daddr
.s6_addr32
[0] = 0;
479 sk
->sk_v6_daddr
.s6_addr32
[1] = 0;
480 sk
->sk_v6_daddr
.s6_addr32
[2] = htonl(0x0000ffff);
481 sk
->sk_v6_daddr
.s6_addr32
[3] = addr
->v4
.sin_addr
.s_addr
;
483 sk
->sk_v6_daddr
= addr
->v6
.sin6_addr
;
487 /* Initialize a sctp_addr from an address parameter. */
488 static void sctp_v6_from_addr_param(union sctp_addr
*addr
,
489 union sctp_addr_param
*param
,
490 __be16 port
, int iif
)
492 addr
->v6
.sin6_family
= AF_INET6
;
493 addr
->v6
.sin6_port
= port
;
494 addr
->v6
.sin6_flowinfo
= 0; /* BUG */
495 addr
->v6
.sin6_addr
= param
->v6
.addr
;
496 addr
->v6
.sin6_scope_id
= iif
;
499 /* Initialize an address parameter from a sctp_addr and return the length
500 * of the address parameter.
502 static int sctp_v6_to_addr_param(const union sctp_addr
*addr
,
503 union sctp_addr_param
*param
)
505 int length
= sizeof(sctp_ipv6addr_param_t
);
507 param
->v6
.param_hdr
.type
= SCTP_PARAM_IPV6_ADDRESS
;
508 param
->v6
.param_hdr
.length
= htons(length
);
509 param
->v6
.addr
= addr
->v6
.sin6_addr
;
514 /* Initialize a sctp_addr from struct in6_addr. */
515 static void sctp_v6_to_addr(union sctp_addr
*addr
, struct in6_addr
*saddr
,
518 addr
->sa
.sa_family
= AF_INET6
;
519 addr
->v6
.sin6_port
= port
;
520 addr
->v6
.sin6_flowinfo
= 0;
521 addr
->v6
.sin6_addr
= *saddr
;
522 addr
->v6
.sin6_scope_id
= 0;
525 static int __sctp_v6_cmp_addr(const union sctp_addr
*addr1
,
526 const union sctp_addr
*addr2
)
528 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
) {
529 if (addr1
->sa
.sa_family
== AF_INET
&&
530 addr2
->sa
.sa_family
== AF_INET6
&&
531 ipv6_addr_v4mapped(&addr2
->v6
.sin6_addr
) &&
532 addr2
->v6
.sin6_addr
.s6_addr32
[3] ==
533 addr1
->v4
.sin_addr
.s_addr
)
536 if (addr2
->sa
.sa_family
== AF_INET
&&
537 addr1
->sa
.sa_family
== AF_INET6
&&
538 ipv6_addr_v4mapped(&addr1
->v6
.sin6_addr
) &&
539 addr1
->v6
.sin6_addr
.s6_addr32
[3] ==
540 addr2
->v4
.sin_addr
.s_addr
)
546 if (!ipv6_addr_equal(&addr1
->v6
.sin6_addr
, &addr2
->v6
.sin6_addr
))
549 /* If this is a linklocal address, compare the scope_id. */
550 if ((ipv6_addr_type(&addr1
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
) &&
551 addr1
->v6
.sin6_scope_id
&& addr2
->v6
.sin6_scope_id
&&
552 addr1
->v6
.sin6_scope_id
!= addr2
->v6
.sin6_scope_id
)
558 /* Compare addresses exactly.
559 * v4-mapped-v6 is also in consideration.
561 static int sctp_v6_cmp_addr(const union sctp_addr
*addr1
,
562 const union sctp_addr
*addr2
)
564 return __sctp_v6_cmp_addr(addr1
, addr2
) &&
565 addr1
->v6
.sin6_port
== addr2
->v6
.sin6_port
;
568 /* Initialize addr struct to INADDR_ANY. */
569 static void sctp_v6_inaddr_any(union sctp_addr
*addr
, __be16 port
)
571 memset(addr
, 0x00, sizeof(union sctp_addr
));
572 addr
->v6
.sin6_family
= AF_INET6
;
573 addr
->v6
.sin6_port
= port
;
576 /* Is this a wildcard address? */
577 static int sctp_v6_is_any(const union sctp_addr
*addr
)
579 return ipv6_addr_any(&addr
->v6
.sin6_addr
);
582 /* Should this be available for binding? */
583 static int sctp_v6_available(union sctp_addr
*addr
, struct sctp_sock
*sp
)
586 struct net
*net
= sock_net(&sp
->inet
.sk
);
587 const struct in6_addr
*in6
= (const struct in6_addr
*)&addr
->v6
.sin6_addr
;
589 type
= ipv6_addr_type(in6
);
590 if (IPV6_ADDR_ANY
== type
)
592 if (type
== IPV6_ADDR_MAPPED
) {
593 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
595 sctp_v6_map_v4(addr
);
596 return sctp_get_af_specific(AF_INET
)->available(addr
, sp
);
598 if (!(type
& IPV6_ADDR_UNICAST
))
601 return sp
->inet
.freebind
|| net
->ipv6
.sysctl
.ip_nonlocal_bind
||
602 ipv6_chk_addr(net
, in6
, NULL
, 0);
605 /* This function checks if the address is a valid address to be used for
609 * Return 0 - If the address is a non-unicast or an illegal address.
610 * Return 1 - If the address is a unicast.
612 static int sctp_v6_addr_valid(union sctp_addr
*addr
,
613 struct sctp_sock
*sp
,
614 const struct sk_buff
*skb
)
616 int ret
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
618 /* Support v4-mapped-v6 address. */
619 if (ret
== IPV6_ADDR_MAPPED
) {
620 /* Note: This routine is used in input, so v4-mapped-v6
621 * are disallowed here when there is no sctp_sock.
623 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
625 sctp_v6_map_v4(addr
);
626 return sctp_get_af_specific(AF_INET
)->addr_valid(addr
, sp
, skb
);
629 /* Is this a non-unicast address */
630 if (!(ret
& IPV6_ADDR_UNICAST
))
636 /* What is the scope of 'addr'? */
637 static sctp_scope_t
sctp_v6_scope(union sctp_addr
*addr
)
642 /* The IPv6 scope is really a set of bit fields.
643 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
646 v6scope
= ipv6_addr_scope(&addr
->v6
.sin6_addr
);
649 retval
= SCTP_SCOPE_LOOPBACK
;
652 retval
= SCTP_SCOPE_LINK
;
655 retval
= SCTP_SCOPE_PRIVATE
;
658 retval
= SCTP_SCOPE_GLOBAL
;
665 /* Create and initialize a new sk for the socket to be returned by accept(). */
666 static struct sock
*sctp_v6_create_accept_sk(struct sock
*sk
,
667 struct sctp_association
*asoc
)
670 struct ipv6_pinfo
*newnp
, *np
= inet6_sk(sk
);
671 struct sctp6_sock
*newsctp6sk
;
672 struct ipv6_txoptions
*opt
;
674 newsk
= sk_alloc(sock_net(sk
), PF_INET6
, GFP_KERNEL
, sk
->sk_prot
, 0);
678 sock_init_data(NULL
, newsk
);
680 sctp_copy_sock(newsk
, sk
, asoc
);
681 sock_reset_flag(sk
, SOCK_ZAPPED
);
683 newsctp6sk
= (struct sctp6_sock
*)newsk
;
684 inet_sk(newsk
)->pinet6
= &newsctp6sk
->inet6
;
686 sctp_sk(newsk
)->v4mapped
= sctp_sk(sk
)->v4mapped
;
688 newnp
= inet6_sk(newsk
);
690 memcpy(newnp
, np
, sizeof(struct ipv6_pinfo
));
691 newnp
->ipv6_mc_list
= NULL
;
692 newnp
->ipv6_ac_list
= NULL
;
693 newnp
->ipv6_fl_list
= NULL
;
696 opt
= rcu_dereference(np
->opt
);
698 opt
= ipv6_dup_options(newsk
, opt
);
699 RCU_INIT_POINTER(newnp
->opt
, opt
);
702 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
705 sctp_v6_to_sk_daddr(&asoc
->peer
.primary_addr
, newsk
);
707 newsk
->sk_v6_rcv_saddr
= sk
->sk_v6_rcv_saddr
;
709 sk_refcnt_debug_inc(newsk
);
711 if (newsk
->sk_prot
->init(newsk
)) {
712 sk_common_release(newsk
);
720 /* Format a sockaddr for return to user space. This makes sure the return is
721 * AF_INET or AF_INET6 depending on the SCTP_I_WANT_MAPPED_V4_ADDR option.
723 static int sctp_v6_addr_to_user(struct sctp_sock
*sp
, union sctp_addr
*addr
)
726 if (addr
->sa
.sa_family
== AF_INET
)
727 sctp_v4_map_v6(addr
);
729 if (addr
->sa
.sa_family
== AF_INET6
&&
730 ipv6_addr_v4mapped(&addr
->v6
.sin6_addr
))
731 sctp_v6_map_v4(addr
);
734 if (addr
->sa
.sa_family
== AF_INET
) {
735 memset(addr
->v4
.sin_zero
, 0, sizeof(addr
->v4
.sin_zero
));
736 return sizeof(struct sockaddr_in
);
738 return sizeof(struct sockaddr_in6
);
741 /* Where did this skb come from? */
742 static int sctp_v6_skb_iif(const struct sk_buff
*skb
)
744 return IP6CB(skb
)->iif
;
747 /* Was this packet marked by Explicit Congestion Notification? */
748 static int sctp_v6_is_ce(const struct sk_buff
*skb
)
750 return *((__u32
*)(ipv6_hdr(skb
))) & htonl(1 << 20);
753 /* Dump the v6 addr to the seq file. */
754 static void sctp_v6_seq_dump_addr(struct seq_file
*seq
, union sctp_addr
*addr
)
756 seq_printf(seq
, "%pI6 ", &addr
->v6
.sin6_addr
);
759 static void sctp_v6_ecn_capable(struct sock
*sk
)
761 inet6_sk(sk
)->tclass
|= INET_ECN_ECT_0
;
764 /* Initialize a PF_INET msgname from a ulpevent. */
765 static void sctp_inet6_event_msgname(struct sctp_ulpevent
*event
,
766 char *msgname
, int *addrlen
)
768 union sctp_addr
*addr
;
769 struct sctp_association
*asoc
;
770 union sctp_addr
*paddr
;
775 addr
= (union sctp_addr
*)msgname
;
777 paddr
= &asoc
->peer
.primary_addr
;
779 if (paddr
->sa
.sa_family
== AF_INET
) {
780 addr
->v4
.sin_family
= AF_INET
;
781 addr
->v4
.sin_port
= htons(asoc
->peer
.port
);
782 addr
->v4
.sin_addr
= paddr
->v4
.sin_addr
;
784 addr
->v6
.sin6_family
= AF_INET6
;
785 addr
->v6
.sin6_flowinfo
= 0;
786 if (ipv6_addr_type(&paddr
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
787 addr
->v6
.sin6_scope_id
= paddr
->v6
.sin6_scope_id
;
789 addr
->v6
.sin6_scope_id
= 0;
790 addr
->v6
.sin6_port
= htons(asoc
->peer
.port
);
791 addr
->v6
.sin6_addr
= paddr
->v6
.sin6_addr
;
794 *addrlen
= sctp_v6_addr_to_user(sctp_sk(asoc
->base
.sk
), addr
);
797 /* Initialize a msg_name from an inbound skb. */
798 static void sctp_inet6_skb_msgname(struct sk_buff
*skb
, char *msgname
,
801 union sctp_addr
*addr
;
807 addr
= (union sctp_addr
*)msgname
;
810 if (ip_hdr(skb
)->version
== 4) {
811 addr
->v4
.sin_family
= AF_INET
;
812 addr
->v4
.sin_port
= sh
->source
;
813 addr
->v4
.sin_addr
.s_addr
= ip_hdr(skb
)->saddr
;
815 addr
->v6
.sin6_family
= AF_INET6
;
816 addr
->v6
.sin6_flowinfo
= 0;
817 addr
->v6
.sin6_port
= sh
->source
;
818 addr
->v6
.sin6_addr
= ipv6_hdr(skb
)->saddr
;
819 if (ipv6_addr_type(&addr
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
820 addr
->v6
.sin6_scope_id
= sctp_v6_skb_iif(skb
);
822 addr
->v6
.sin6_scope_id
= 0;
825 *addr_len
= sctp_v6_addr_to_user(sctp_sk(skb
->sk
), addr
);
828 /* Do we support this AF? */
829 static int sctp_inet6_af_supported(sa_family_t family
, struct sctp_sock
*sp
)
834 /* v4-mapped-v6 addresses */
836 if (!__ipv6_only_sock(sctp_opt2sk(sp
)))
843 /* Address matching with wildcards allowed. This extra level
844 * of indirection lets us choose whether a PF_INET6 should
845 * disallow any v4 addresses if we so choose.
847 static int sctp_inet6_cmp_addr(const union sctp_addr
*addr1
,
848 const union sctp_addr
*addr2
,
849 struct sctp_sock
*opt
)
851 struct sock
*sk
= sctp_opt2sk(opt
);
852 struct sctp_af
*af1
, *af2
;
854 af1
= sctp_get_af_specific(addr1
->sa
.sa_family
);
855 af2
= sctp_get_af_specific(addr2
->sa
.sa_family
);
860 /* If the socket is IPv6 only, v4 addrs will not match */
861 if (__ipv6_only_sock(sk
) && af1
!= af2
)
864 /* Today, wildcard AF_INET/AF_INET6. */
865 if (sctp_is_any(sk
, addr1
) || sctp_is_any(sk
, addr2
))
868 if (addr1
->sa
.sa_family
== AF_INET
&& addr2
->sa
.sa_family
== AF_INET
)
869 return addr1
->v4
.sin_addr
.s_addr
== addr2
->v4
.sin_addr
.s_addr
;
871 return __sctp_v6_cmp_addr(addr1
, addr2
);
874 /* Verify that the provided sockaddr looks bindable. Common verification,
875 * has already been taken care of.
877 static int sctp_inet6_bind_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
881 /* ASSERT: address family has already been verified. */
882 if (addr
->sa
.sa_family
!= AF_INET6
)
883 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
885 int type
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
886 struct net_device
*dev
;
888 if (type
& IPV6_ADDR_LINKLOCAL
) {
890 if (!addr
->v6
.sin6_scope_id
)
892 net
= sock_net(&opt
->inet
.sk
);
894 dev
= dev_get_by_index_rcu(net
, addr
->v6
.sin6_scope_id
);
895 if (!dev
|| !(opt
->inet
.freebind
||
896 net
->ipv6
.sysctl
.ip_nonlocal_bind
||
897 ipv6_chk_addr(net
, &addr
->v6
.sin6_addr
,
907 return af
->available(addr
, opt
);
910 /* Verify that the provided sockaddr looks sendable. Common verification,
911 * has already been taken care of.
913 static int sctp_inet6_send_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
915 struct sctp_af
*af
= NULL
;
917 /* ASSERT: address family has already been verified. */
918 if (addr
->sa
.sa_family
!= AF_INET6
)
919 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
921 int type
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
922 struct net_device
*dev
;
924 if (type
& IPV6_ADDR_LINKLOCAL
) {
925 if (!addr
->v6
.sin6_scope_id
)
928 dev
= dev_get_by_index_rcu(sock_net(&opt
->inet
.sk
),
929 addr
->v6
.sin6_scope_id
);
940 /* Fill in Supported Address Type information for INIT and INIT-ACK
941 * chunks. Note: In the future, we may want to look at sock options
942 * to determine whether a PF_INET6 socket really wants to have IPV4
944 * Returns number of addresses supported.
946 static int sctp_inet6_supported_addrs(const struct sctp_sock
*opt
,
949 types
[0] = SCTP_PARAM_IPV6_ADDRESS
;
950 if (!opt
|| !ipv6_only_sock(sctp_opt2sk(opt
))) {
951 types
[1] = SCTP_PARAM_IPV4_ADDRESS
;
957 /* Handle SCTP_I_WANT_MAPPED_V4_ADDR for getpeername() and getsockname() */
958 static int sctp_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
959 int *uaddr_len
, int peer
)
963 rc
= inet6_getname(sock
, uaddr
, uaddr_len
, peer
);
968 *uaddr_len
= sctp_v6_addr_to_user(sctp_sk(sock
->sk
),
969 (union sctp_addr
*)uaddr
);
974 static const struct proto_ops inet6_seqpacket_ops
= {
976 .owner
= THIS_MODULE
,
977 .release
= inet6_release
,
979 .connect
= inet_dgram_connect
,
980 .socketpair
= sock_no_socketpair
,
981 .accept
= inet_accept
,
982 .getname
= sctp_getname
,
984 .ioctl
= inet6_ioctl
,
985 .listen
= sctp_inet_listen
,
986 .shutdown
= inet_shutdown
,
987 .setsockopt
= sock_common_setsockopt
,
988 .getsockopt
= sock_common_getsockopt
,
989 .sendmsg
= inet_sendmsg
,
990 .recvmsg
= inet_recvmsg
,
991 .mmap
= sock_no_mmap
,
993 .compat_setsockopt
= compat_sock_common_setsockopt
,
994 .compat_getsockopt
= compat_sock_common_getsockopt
,
998 static struct inet_protosw sctpv6_seqpacket_protosw
= {
999 .type
= SOCK_SEQPACKET
,
1000 .protocol
= IPPROTO_SCTP
,
1001 .prot
= &sctpv6_prot
,
1002 .ops
= &inet6_seqpacket_ops
,
1003 .flags
= SCTP_PROTOSW_FLAG
1005 static struct inet_protosw sctpv6_stream_protosw
= {
1006 .type
= SOCK_STREAM
,
1007 .protocol
= IPPROTO_SCTP
,
1008 .prot
= &sctpv6_prot
,
1009 .ops
= &inet6_seqpacket_ops
,
1010 .flags
= SCTP_PROTOSW_FLAG
,
1013 static int sctp6_rcv(struct sk_buff
*skb
)
1015 return sctp_rcv(skb
) ? -1 : 0;
1018 static const struct inet6_protocol sctpv6_protocol
= {
1019 .handler
= sctp6_rcv
,
1020 .err_handler
= sctp_v6_err
,
1021 .flags
= INET6_PROTO_NOPOLICY
| INET6_PROTO_FINAL
,
1024 static struct sctp_af sctp_af_inet6
= {
1025 .sa_family
= AF_INET6
,
1026 .sctp_xmit
= sctp_v6_xmit
,
1027 .setsockopt
= ipv6_setsockopt
,
1028 .getsockopt
= ipv6_getsockopt
,
1029 .get_dst
= sctp_v6_get_dst
,
1030 .get_saddr
= sctp_v6_get_saddr
,
1031 .copy_addrlist
= sctp_v6_copy_addrlist
,
1032 .from_skb
= sctp_v6_from_skb
,
1033 .from_sk
= sctp_v6_from_sk
,
1034 .from_addr_param
= sctp_v6_from_addr_param
,
1035 .to_addr_param
= sctp_v6_to_addr_param
,
1036 .cmp_addr
= sctp_v6_cmp_addr
,
1037 .scope
= sctp_v6_scope
,
1038 .addr_valid
= sctp_v6_addr_valid
,
1039 .inaddr_any
= sctp_v6_inaddr_any
,
1040 .is_any
= sctp_v6_is_any
,
1041 .available
= sctp_v6_available
,
1042 .skb_iif
= sctp_v6_skb_iif
,
1043 .is_ce
= sctp_v6_is_ce
,
1044 .seq_dump_addr
= sctp_v6_seq_dump_addr
,
1045 .ecn_capable
= sctp_v6_ecn_capable
,
1046 .net_header_len
= sizeof(struct ipv6hdr
),
1047 .sockaddr_len
= sizeof(struct sockaddr_in6
),
1048 #ifdef CONFIG_COMPAT
1049 .compat_setsockopt
= compat_ipv6_setsockopt
,
1050 .compat_getsockopt
= compat_ipv6_getsockopt
,
1054 static struct sctp_pf sctp_pf_inet6
= {
1055 .event_msgname
= sctp_inet6_event_msgname
,
1056 .skb_msgname
= sctp_inet6_skb_msgname
,
1057 .af_supported
= sctp_inet6_af_supported
,
1058 .cmp_addr
= sctp_inet6_cmp_addr
,
1059 .bind_verify
= sctp_inet6_bind_verify
,
1060 .send_verify
= sctp_inet6_send_verify
,
1061 .supported_addrs
= sctp_inet6_supported_addrs
,
1062 .create_accept_sk
= sctp_v6_create_accept_sk
,
1063 .addr_to_user
= sctp_v6_addr_to_user
,
1064 .to_sk_saddr
= sctp_v6_to_sk_saddr
,
1065 .to_sk_daddr
= sctp_v6_to_sk_daddr
,
1066 .af
= &sctp_af_inet6
,
1069 /* Initialize IPv6 support and register with socket layer. */
1070 void sctp_v6_pf_init(void)
1072 /* Register the SCTP specific PF_INET6 functions. */
1073 sctp_register_pf(&sctp_pf_inet6
, PF_INET6
);
1075 /* Register the SCTP specific AF_INET6 functions. */
1076 sctp_register_af(&sctp_af_inet6
);
1079 void sctp_v6_pf_exit(void)
1081 list_del(&sctp_af_inet6
.list
);
1084 /* Initialize IPv6 support and register with socket layer. */
1085 int sctp_v6_protosw_init(void)
1089 rc
= proto_register(&sctpv6_prot
, 1);
1093 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1094 inet6_register_protosw(&sctpv6_seqpacket_protosw
);
1095 inet6_register_protosw(&sctpv6_stream_protosw
);
1100 void sctp_v6_protosw_exit(void)
1102 inet6_unregister_protosw(&sctpv6_seqpacket_protosw
);
1103 inet6_unregister_protosw(&sctpv6_stream_protosw
);
1104 proto_unregister(&sctpv6_prot
);
1108 /* Register with inet6 layer. */
1109 int sctp_v6_add_protocol(void)
1111 /* Register notifier for inet6 address additions/deletions. */
1112 register_inet6addr_notifier(&sctp_inet6addr_notifier
);
1114 if (inet6_add_protocol(&sctpv6_protocol
, IPPROTO_SCTP
) < 0)
1120 /* Unregister with inet6 layer. */
1121 void sctp_v6_del_protocol(void)
1123 inet6_del_protocol(&sctpv6_protocol
, IPPROTO_SCTP
);
1124 unregister_inet6addr_notifier(&sctp_inet6addr_notifier
);