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
= kzalloc(sizeof(*addr
), GFP_ATOMIC
);
102 addr
->a
.v6
.sin6_family
= AF_INET6
;
103 addr
->a
.v6
.sin6_addr
= ifa
->addr
;
104 addr
->a
.v6
.sin6_scope_id
= ifa
->idev
->dev
->ifindex
;
106 spin_lock_bh(&net
->sctp
.local_addr_lock
);
107 list_add_tail_rcu(&addr
->list
, &net
->sctp
.local_addr_list
);
108 sctp_addr_wq_mgmt(net
, addr
, SCTP_ADDR_NEW
);
109 spin_unlock_bh(&net
->sctp
.local_addr_lock
);
113 spin_lock_bh(&net
->sctp
.local_addr_lock
);
114 list_for_each_entry_safe(addr
, temp
,
115 &net
->sctp
.local_addr_list
, list
) {
116 if (addr
->a
.sa
.sa_family
== AF_INET6
&&
117 ipv6_addr_equal(&addr
->a
.v6
.sin6_addr
,
119 sctp_addr_wq_mgmt(net
, addr
, SCTP_ADDR_DEL
);
122 list_del_rcu(&addr
->list
);
126 spin_unlock_bh(&net
->sctp
.local_addr_lock
);
128 kfree_rcu(addr
, rcu
);
135 static struct notifier_block sctp_inet6addr_notifier
= {
136 .notifier_call
= sctp_inet6addr_event
,
139 /* ICMP error handler. */
140 static void sctp_v6_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
141 u8 type
, u8 code
, int offset
, __be32 info
)
143 struct inet6_dev
*idev
;
145 struct sctp_association
*asoc
;
146 struct sctp_transport
*transport
;
147 struct ipv6_pinfo
*np
;
148 __u16 saveip
, savesctp
;
150 struct net
*net
= dev_net(skb
->dev
);
152 idev
= in6_dev_get(skb
->dev
);
154 /* Fix up skb to look at the embedded net header. */
155 saveip
= skb
->network_header
;
156 savesctp
= skb
->transport_header
;
157 skb_reset_network_header(skb
);
158 skb_set_transport_header(skb
, offset
);
159 sk
= sctp_err_lookup(net
, AF_INET6
, skb
, sctp_hdr(skb
), &asoc
, &transport
);
160 /* Put back, the original pointers. */
161 skb
->network_header
= saveip
;
162 skb
->transport_header
= savesctp
;
164 __ICMP6_INC_STATS(net
, idev
, ICMP6_MIB_INERRORS
);
168 /* Warning: The sock lock is held. Remember to call
173 case ICMPV6_PKT_TOOBIG
:
174 if (ip6_sk_accept_pmtu(sk
))
175 sctp_icmp_frag_needed(sk
, asoc
, transport
, ntohl(info
));
177 case ICMPV6_PARAMPROB
:
178 if (ICMPV6_UNK_NEXTHDR
== code
) {
179 sctp_icmp_proto_unreachable(sk
, asoc
, transport
);
184 sctp_icmp_redirect(sk
, transport
, skb
);
191 icmpv6_err_convert(type
, code
, &err
);
192 if (!sock_owned_by_user(sk
) && np
->recverr
) {
194 sk
->sk_error_report(sk
);
195 } else { /* Only an error on timeout */
196 sk
->sk_err_soft
= err
;
200 sctp_err_finish(sk
, transport
);
202 if (likely(idev
!= NULL
))
206 static int sctp_v6_xmit(struct sk_buff
*skb
, struct sctp_transport
*transport
)
208 struct sock
*sk
= skb
->sk
;
209 struct ipv6_pinfo
*np
= inet6_sk(sk
);
210 struct flowi6
*fl6
= &transport
->fl
.u
.ip6
;
213 pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__
, skb
,
214 skb
->len
, &fl6
->saddr
, &fl6
->daddr
);
216 IP6_ECN_flow_xmit(sk
, fl6
->flowlabel
);
218 if (!(transport
->param_flags
& SPP_PMTUD_ENABLE
))
221 SCTP_INC_STATS(sock_net(sk
), SCTP_MIB_OUTSCTPPACKS
);
224 res
= ip6_xmit(sk
, skb
, fl6
, sk
->sk_mark
, rcu_dereference(np
->opt
),
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
*daddr
= &t
->ipaddr
;
243 union sctp_addr dst_saddr
;
244 struct in6_addr
*final_p
, final
;
245 enum sctp_scope scope
;
248 memset(fl6
, 0, sizeof(struct flowi6
));
249 fl6
->daddr
= daddr
->v6
.sin6_addr
;
250 fl6
->fl6_dport
= daddr
->v6
.sin6_port
;
251 fl6
->flowi6_proto
= IPPROTO_SCTP
;
252 if (ipv6_addr_type(&daddr
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
253 fl6
->flowi6_oif
= daddr
->v6
.sin6_scope_id
;
255 fl6
->flowi6_oif
= asoc
->base
.sk
->sk_bound_dev_if
;
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_addr
= ifp
->addr
;
417 addr
->a
.v6
.sin6_scope_id
= dev
->ifindex
;
419 INIT_LIST_HEAD(&addr
->list
);
420 list_add_tail(&addr
->list
, addrlist
);
424 read_unlock_bh(&in6_dev
->lock
);
428 /* Initialize a sockaddr_storage from in incoming skb. */
429 static void sctp_v6_from_skb(union sctp_addr
*addr
, struct sk_buff
*skb
,
432 /* Always called on head skb, so this is safe */
433 struct sctphdr
*sh
= sctp_hdr(skb
);
434 struct sockaddr_in6
*sa
= &addr
->v6
;
436 addr
->v6
.sin6_family
= AF_INET6
;
437 addr
->v6
.sin6_flowinfo
= 0; /* FIXME */
438 addr
->v6
.sin6_scope_id
= ((struct inet6_skb_parm
*)skb
->cb
)->iif
;
441 sa
->sin6_port
= sh
->source
;
442 sa
->sin6_addr
= ipv6_hdr(skb
)->saddr
;
444 sa
->sin6_port
= sh
->dest
;
445 sa
->sin6_addr
= ipv6_hdr(skb
)->daddr
;
449 /* Initialize an sctp_addr from a socket. */
450 static void sctp_v6_from_sk(union sctp_addr
*addr
, struct sock
*sk
)
452 addr
->v6
.sin6_family
= AF_INET6
;
453 addr
->v6
.sin6_port
= 0;
454 addr
->v6
.sin6_addr
= sk
->sk_v6_rcv_saddr
;
457 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
458 static void sctp_v6_to_sk_saddr(union sctp_addr
*addr
, struct sock
*sk
)
460 if (addr
->sa
.sa_family
== AF_INET
) {
461 sk
->sk_v6_rcv_saddr
.s6_addr32
[0] = 0;
462 sk
->sk_v6_rcv_saddr
.s6_addr32
[1] = 0;
463 sk
->sk_v6_rcv_saddr
.s6_addr32
[2] = htonl(0x0000ffff);
464 sk
->sk_v6_rcv_saddr
.s6_addr32
[3] =
465 addr
->v4
.sin_addr
.s_addr
;
467 sk
->sk_v6_rcv_saddr
= addr
->v6
.sin6_addr
;
471 /* Initialize sk->sk_daddr from sctp_addr. */
472 static void sctp_v6_to_sk_daddr(union sctp_addr
*addr
, struct sock
*sk
)
474 if (addr
->sa
.sa_family
== AF_INET
) {
475 sk
->sk_v6_daddr
.s6_addr32
[0] = 0;
476 sk
->sk_v6_daddr
.s6_addr32
[1] = 0;
477 sk
->sk_v6_daddr
.s6_addr32
[2] = htonl(0x0000ffff);
478 sk
->sk_v6_daddr
.s6_addr32
[3] = addr
->v4
.sin_addr
.s_addr
;
480 sk
->sk_v6_daddr
= addr
->v6
.sin6_addr
;
484 /* Initialize a sctp_addr from an address parameter. */
485 static void sctp_v6_from_addr_param(union sctp_addr
*addr
,
486 union sctp_addr_param
*param
,
487 __be16 port
, int iif
)
489 addr
->v6
.sin6_family
= AF_INET6
;
490 addr
->v6
.sin6_port
= port
;
491 addr
->v6
.sin6_flowinfo
= 0; /* BUG */
492 addr
->v6
.sin6_addr
= param
->v6
.addr
;
493 addr
->v6
.sin6_scope_id
= iif
;
496 /* Initialize an address parameter from a sctp_addr and return the length
497 * of the address parameter.
499 static int sctp_v6_to_addr_param(const union sctp_addr
*addr
,
500 union sctp_addr_param
*param
)
502 int length
= sizeof(struct sctp_ipv6addr_param
);
504 param
->v6
.param_hdr
.type
= SCTP_PARAM_IPV6_ADDRESS
;
505 param
->v6
.param_hdr
.length
= htons(length
);
506 param
->v6
.addr
= addr
->v6
.sin6_addr
;
511 /* Initialize a sctp_addr from struct in6_addr. */
512 static void sctp_v6_to_addr(union sctp_addr
*addr
, struct in6_addr
*saddr
,
515 addr
->sa
.sa_family
= AF_INET6
;
516 addr
->v6
.sin6_port
= port
;
517 addr
->v6
.sin6_flowinfo
= 0;
518 addr
->v6
.sin6_addr
= *saddr
;
519 addr
->v6
.sin6_scope_id
= 0;
522 static int __sctp_v6_cmp_addr(const union sctp_addr
*addr1
,
523 const union sctp_addr
*addr2
)
525 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
) {
526 if (addr1
->sa
.sa_family
== AF_INET
&&
527 addr2
->sa
.sa_family
== AF_INET6
&&
528 ipv6_addr_v4mapped(&addr2
->v6
.sin6_addr
) &&
529 addr2
->v6
.sin6_addr
.s6_addr32
[3] ==
530 addr1
->v4
.sin_addr
.s_addr
)
533 if (addr2
->sa
.sa_family
== AF_INET
&&
534 addr1
->sa
.sa_family
== AF_INET6
&&
535 ipv6_addr_v4mapped(&addr1
->v6
.sin6_addr
) &&
536 addr1
->v6
.sin6_addr
.s6_addr32
[3] ==
537 addr2
->v4
.sin_addr
.s_addr
)
543 if (!ipv6_addr_equal(&addr1
->v6
.sin6_addr
, &addr2
->v6
.sin6_addr
))
546 /* If this is a linklocal address, compare the scope_id. */
547 if ((ipv6_addr_type(&addr1
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
) &&
548 addr1
->v6
.sin6_scope_id
&& addr2
->v6
.sin6_scope_id
&&
549 addr1
->v6
.sin6_scope_id
!= addr2
->v6
.sin6_scope_id
)
555 /* Compare addresses exactly.
556 * v4-mapped-v6 is also in consideration.
558 static int sctp_v6_cmp_addr(const union sctp_addr
*addr1
,
559 const union sctp_addr
*addr2
)
561 return __sctp_v6_cmp_addr(addr1
, addr2
) &&
562 addr1
->v6
.sin6_port
== addr2
->v6
.sin6_port
;
565 /* Initialize addr struct to INADDR_ANY. */
566 static void sctp_v6_inaddr_any(union sctp_addr
*addr
, __be16 port
)
568 memset(addr
, 0x00, sizeof(union sctp_addr
));
569 addr
->v6
.sin6_family
= AF_INET6
;
570 addr
->v6
.sin6_port
= port
;
573 /* Is this a wildcard address? */
574 static int sctp_v6_is_any(const union sctp_addr
*addr
)
576 return ipv6_addr_any(&addr
->v6
.sin6_addr
);
579 /* Should this be available for binding? */
580 static int sctp_v6_available(union sctp_addr
*addr
, struct sctp_sock
*sp
)
583 struct net
*net
= sock_net(&sp
->inet
.sk
);
584 const struct in6_addr
*in6
= (const struct in6_addr
*)&addr
->v6
.sin6_addr
;
586 type
= ipv6_addr_type(in6
);
587 if (IPV6_ADDR_ANY
== type
)
589 if (type
== IPV6_ADDR_MAPPED
) {
590 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
592 sctp_v6_map_v4(addr
);
593 return sctp_get_af_specific(AF_INET
)->available(addr
, sp
);
595 if (!(type
& IPV6_ADDR_UNICAST
))
598 return sp
->inet
.freebind
|| net
->ipv6
.sysctl
.ip_nonlocal_bind
||
599 ipv6_chk_addr(net
, in6
, NULL
, 0);
602 /* This function checks if the address is a valid address to be used for
606 * Return 0 - If the address is a non-unicast or an illegal address.
607 * Return 1 - If the address is a unicast.
609 static int sctp_v6_addr_valid(union sctp_addr
*addr
,
610 struct sctp_sock
*sp
,
611 const struct sk_buff
*skb
)
613 int ret
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
615 /* Support v4-mapped-v6 address. */
616 if (ret
== IPV6_ADDR_MAPPED
) {
617 /* Note: This routine is used in input, so v4-mapped-v6
618 * are disallowed here when there is no sctp_sock.
620 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
622 sctp_v6_map_v4(addr
);
623 return sctp_get_af_specific(AF_INET
)->addr_valid(addr
, sp
, skb
);
626 /* Is this a non-unicast address */
627 if (!(ret
& IPV6_ADDR_UNICAST
))
633 /* What is the scope of 'addr'? */
634 static enum sctp_scope
sctp_v6_scope(union sctp_addr
*addr
)
636 enum sctp_scope retval
;
639 /* The IPv6 scope is really a set of bit fields.
640 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
643 v6scope
= ipv6_addr_scope(&addr
->v6
.sin6_addr
);
646 retval
= SCTP_SCOPE_LOOPBACK
;
649 retval
= SCTP_SCOPE_LINK
;
652 retval
= SCTP_SCOPE_PRIVATE
;
655 retval
= SCTP_SCOPE_GLOBAL
;
662 /* Create and initialize a new sk for the socket to be returned by accept(). */
663 static struct sock
*sctp_v6_create_accept_sk(struct sock
*sk
,
664 struct sctp_association
*asoc
,
668 struct ipv6_pinfo
*newnp
, *np
= inet6_sk(sk
);
669 struct sctp6_sock
*newsctp6sk
;
670 struct ipv6_txoptions
*opt
;
672 newsk
= sk_alloc(sock_net(sk
), PF_INET6
, GFP_KERNEL
, sk
->sk_prot
, kern
);
676 sock_init_data(NULL
, newsk
);
678 sctp_copy_sock(newsk
, sk
, asoc
);
679 sock_reset_flag(sk
, SOCK_ZAPPED
);
681 newsctp6sk
= (struct sctp6_sock
*)newsk
;
682 inet_sk(newsk
)->pinet6
= &newsctp6sk
->inet6
;
684 sctp_sk(newsk
)->v4mapped
= sctp_sk(sk
)->v4mapped
;
686 newnp
= inet6_sk(newsk
);
688 memcpy(newnp
, np
, sizeof(struct ipv6_pinfo
));
689 newnp
->ipv6_mc_list
= NULL
;
690 newnp
->ipv6_ac_list
= NULL
;
691 newnp
->ipv6_fl_list
= NULL
;
694 opt
= rcu_dereference(np
->opt
);
696 opt
= ipv6_dup_options(newsk
, opt
);
697 RCU_INIT_POINTER(newnp
->opt
, opt
);
700 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
703 sctp_v6_to_sk_daddr(&asoc
->peer
.primary_addr
, newsk
);
705 newsk
->sk_v6_rcv_saddr
= sk
->sk_v6_rcv_saddr
;
707 sk_refcnt_debug_inc(newsk
);
709 if (newsk
->sk_prot
->init(newsk
)) {
710 sk_common_release(newsk
);
718 /* Format a sockaddr for return to user space. This makes sure the return is
719 * AF_INET or AF_INET6 depending on the SCTP_I_WANT_MAPPED_V4_ADDR option.
721 static int sctp_v6_addr_to_user(struct sctp_sock
*sp
, union sctp_addr
*addr
)
724 if (addr
->sa
.sa_family
== AF_INET
)
725 sctp_v4_map_v6(addr
);
727 if (addr
->sa
.sa_family
== AF_INET6
&&
728 ipv6_addr_v4mapped(&addr
->v6
.sin6_addr
))
729 sctp_v6_map_v4(addr
);
732 if (addr
->sa
.sa_family
== AF_INET
) {
733 memset(addr
->v4
.sin_zero
, 0, sizeof(addr
->v4
.sin_zero
));
734 return sizeof(struct sockaddr_in
);
736 return sizeof(struct sockaddr_in6
);
739 /* Where did this skb come from? */
740 static int sctp_v6_skb_iif(const struct sk_buff
*skb
)
742 return IP6CB(skb
)->iif
;
745 /* Was this packet marked by Explicit Congestion Notification? */
746 static int sctp_v6_is_ce(const struct sk_buff
*skb
)
748 return *((__u32
*)(ipv6_hdr(skb
))) & (__force __u32
)htonl(1 << 20);
751 /* Dump the v6 addr to the seq file. */
752 static void sctp_v6_seq_dump_addr(struct seq_file
*seq
, union sctp_addr
*addr
)
754 seq_printf(seq
, "%pI6 ", &addr
->v6
.sin6_addr
);
757 static void sctp_v6_ecn_capable(struct sock
*sk
)
759 inet6_sk(sk
)->tclass
|= INET_ECN_ECT_0
;
762 /* Initialize a PF_INET msgname from a ulpevent. */
763 static void sctp_inet6_event_msgname(struct sctp_ulpevent
*event
,
764 char *msgname
, int *addrlen
)
766 union sctp_addr
*addr
;
767 struct sctp_association
*asoc
;
768 union sctp_addr
*paddr
;
773 addr
= (union sctp_addr
*)msgname
;
775 paddr
= &asoc
->peer
.primary_addr
;
777 if (paddr
->sa
.sa_family
== AF_INET
) {
778 addr
->v4
.sin_family
= AF_INET
;
779 addr
->v4
.sin_port
= htons(asoc
->peer
.port
);
780 addr
->v4
.sin_addr
= paddr
->v4
.sin_addr
;
782 addr
->v6
.sin6_family
= AF_INET6
;
783 addr
->v6
.sin6_flowinfo
= 0;
784 if (ipv6_addr_type(&paddr
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
785 addr
->v6
.sin6_scope_id
= paddr
->v6
.sin6_scope_id
;
787 addr
->v6
.sin6_scope_id
= 0;
788 addr
->v6
.sin6_port
= htons(asoc
->peer
.port
);
789 addr
->v6
.sin6_addr
= paddr
->v6
.sin6_addr
;
792 *addrlen
= sctp_v6_addr_to_user(sctp_sk(asoc
->base
.sk
), addr
);
795 /* Initialize a msg_name from an inbound skb. */
796 static void sctp_inet6_skb_msgname(struct sk_buff
*skb
, char *msgname
,
799 union sctp_addr
*addr
;
805 addr
= (union sctp_addr
*)msgname
;
808 if (ip_hdr(skb
)->version
== 4) {
809 addr
->v4
.sin_family
= AF_INET
;
810 addr
->v4
.sin_port
= sh
->source
;
811 addr
->v4
.sin_addr
.s_addr
= ip_hdr(skb
)->saddr
;
813 addr
->v6
.sin6_family
= AF_INET6
;
814 addr
->v6
.sin6_flowinfo
= 0;
815 addr
->v6
.sin6_port
= sh
->source
;
816 addr
->v6
.sin6_addr
= ipv6_hdr(skb
)->saddr
;
817 if (ipv6_addr_type(&addr
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
818 addr
->v6
.sin6_scope_id
= sctp_v6_skb_iif(skb
);
820 addr
->v6
.sin6_scope_id
= 0;
823 *addr_len
= sctp_v6_addr_to_user(sctp_sk(skb
->sk
), addr
);
826 /* Do we support this AF? */
827 static int sctp_inet6_af_supported(sa_family_t family
, struct sctp_sock
*sp
)
832 /* v4-mapped-v6 addresses */
834 if (!__ipv6_only_sock(sctp_opt2sk(sp
)))
841 /* Address matching with wildcards allowed. This extra level
842 * of indirection lets us choose whether a PF_INET6 should
843 * disallow any v4 addresses if we so choose.
845 static int sctp_inet6_cmp_addr(const union sctp_addr
*addr1
,
846 const union sctp_addr
*addr2
,
847 struct sctp_sock
*opt
)
849 struct sock
*sk
= sctp_opt2sk(opt
);
850 struct sctp_af
*af1
, *af2
;
852 af1
= sctp_get_af_specific(addr1
->sa
.sa_family
);
853 af2
= sctp_get_af_specific(addr2
->sa
.sa_family
);
858 /* If the socket is IPv6 only, v4 addrs will not match */
859 if (__ipv6_only_sock(sk
) && af1
!= af2
)
862 /* Today, wildcard AF_INET/AF_INET6. */
863 if (sctp_is_any(sk
, addr1
) || sctp_is_any(sk
, addr2
))
866 if (addr1
->sa
.sa_family
== AF_INET
&& addr2
->sa
.sa_family
== AF_INET
)
867 return addr1
->v4
.sin_addr
.s_addr
== addr2
->v4
.sin_addr
.s_addr
;
869 return __sctp_v6_cmp_addr(addr1
, addr2
);
872 /* Verify that the provided sockaddr looks bindable. Common verification,
873 * has already been taken care of.
875 static int sctp_inet6_bind_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
879 /* ASSERT: address family has already been verified. */
880 if (addr
->sa
.sa_family
!= AF_INET6
)
881 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
883 int type
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
884 struct net_device
*dev
;
886 if (type
& IPV6_ADDR_LINKLOCAL
) {
888 if (!addr
->v6
.sin6_scope_id
)
890 net
= sock_net(&opt
->inet
.sk
);
892 dev
= dev_get_by_index_rcu(net
, addr
->v6
.sin6_scope_id
);
893 if (!dev
|| !(opt
->inet
.freebind
||
894 net
->ipv6
.sysctl
.ip_nonlocal_bind
||
895 ipv6_chk_addr(net
, &addr
->v6
.sin6_addr
,
905 return af
->available(addr
, opt
);
908 /* Verify that the provided sockaddr looks sendable. Common verification,
909 * has already been taken care of.
911 static int sctp_inet6_send_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
913 struct sctp_af
*af
= NULL
;
915 /* ASSERT: address family has already been verified. */
916 if (addr
->sa
.sa_family
!= AF_INET6
)
917 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
919 int type
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
920 struct net_device
*dev
;
922 if (type
& IPV6_ADDR_LINKLOCAL
) {
923 if (!addr
->v6
.sin6_scope_id
)
926 dev
= dev_get_by_index_rcu(sock_net(&opt
->inet
.sk
),
927 addr
->v6
.sin6_scope_id
);
938 /* Fill in Supported Address Type information for INIT and INIT-ACK
939 * chunks. Note: In the future, we may want to look at sock options
940 * to determine whether a PF_INET6 socket really wants to have IPV4
942 * Returns number of addresses supported.
944 static int sctp_inet6_supported_addrs(const struct sctp_sock
*opt
,
947 types
[0] = SCTP_PARAM_IPV6_ADDRESS
;
948 if (!opt
|| !ipv6_only_sock(sctp_opt2sk(opt
))) {
949 types
[1] = SCTP_PARAM_IPV4_ADDRESS
;
955 /* Handle SCTP_I_WANT_MAPPED_V4_ADDR for getpeername() and getsockname() */
956 static int sctp_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
957 int *uaddr_len
, int peer
)
961 rc
= inet6_getname(sock
, uaddr
, uaddr_len
, peer
);
966 *uaddr_len
= sctp_v6_addr_to_user(sctp_sk(sock
->sk
),
967 (union sctp_addr
*)uaddr
);
972 static const struct proto_ops inet6_seqpacket_ops
= {
974 .owner
= THIS_MODULE
,
975 .release
= inet6_release
,
977 .connect
= inet_dgram_connect
,
978 .socketpair
= sock_no_socketpair
,
979 .accept
= inet_accept
,
980 .getname
= sctp_getname
,
982 .ioctl
= inet6_ioctl
,
983 .listen
= sctp_inet_listen
,
984 .shutdown
= inet_shutdown
,
985 .setsockopt
= sock_common_setsockopt
,
986 .getsockopt
= sock_common_getsockopt
,
987 .sendmsg
= inet_sendmsg
,
988 .recvmsg
= inet_recvmsg
,
989 .mmap
= sock_no_mmap
,
991 .compat_setsockopt
= compat_sock_common_setsockopt
,
992 .compat_getsockopt
= compat_sock_common_getsockopt
,
996 static struct inet_protosw sctpv6_seqpacket_protosw
= {
997 .type
= SOCK_SEQPACKET
,
998 .protocol
= IPPROTO_SCTP
,
999 .prot
= &sctpv6_prot
,
1000 .ops
= &inet6_seqpacket_ops
,
1001 .flags
= SCTP_PROTOSW_FLAG
1003 static struct inet_protosw sctpv6_stream_protosw
= {
1004 .type
= SOCK_STREAM
,
1005 .protocol
= IPPROTO_SCTP
,
1006 .prot
= &sctpv6_prot
,
1007 .ops
= &inet6_seqpacket_ops
,
1008 .flags
= SCTP_PROTOSW_FLAG
,
1011 static int sctp6_rcv(struct sk_buff
*skb
)
1013 return sctp_rcv(skb
) ? -1 : 0;
1016 static const struct inet6_protocol sctpv6_protocol
= {
1017 .handler
= sctp6_rcv
,
1018 .err_handler
= sctp_v6_err
,
1019 .flags
= INET6_PROTO_NOPOLICY
| INET6_PROTO_FINAL
,
1022 static struct sctp_af sctp_af_inet6
= {
1023 .sa_family
= AF_INET6
,
1024 .sctp_xmit
= sctp_v6_xmit
,
1025 .setsockopt
= ipv6_setsockopt
,
1026 .getsockopt
= ipv6_getsockopt
,
1027 .get_dst
= sctp_v6_get_dst
,
1028 .get_saddr
= sctp_v6_get_saddr
,
1029 .copy_addrlist
= sctp_v6_copy_addrlist
,
1030 .from_skb
= sctp_v6_from_skb
,
1031 .from_sk
= sctp_v6_from_sk
,
1032 .from_addr_param
= sctp_v6_from_addr_param
,
1033 .to_addr_param
= sctp_v6_to_addr_param
,
1034 .cmp_addr
= sctp_v6_cmp_addr
,
1035 .scope
= sctp_v6_scope
,
1036 .addr_valid
= sctp_v6_addr_valid
,
1037 .inaddr_any
= sctp_v6_inaddr_any
,
1038 .is_any
= sctp_v6_is_any
,
1039 .available
= sctp_v6_available
,
1040 .skb_iif
= sctp_v6_skb_iif
,
1041 .is_ce
= sctp_v6_is_ce
,
1042 .seq_dump_addr
= sctp_v6_seq_dump_addr
,
1043 .ecn_capable
= sctp_v6_ecn_capable
,
1044 .net_header_len
= sizeof(struct ipv6hdr
),
1045 .sockaddr_len
= sizeof(struct sockaddr_in6
),
1046 #ifdef CONFIG_COMPAT
1047 .compat_setsockopt
= compat_ipv6_setsockopt
,
1048 .compat_getsockopt
= compat_ipv6_getsockopt
,
1052 static struct sctp_pf sctp_pf_inet6
= {
1053 .event_msgname
= sctp_inet6_event_msgname
,
1054 .skb_msgname
= sctp_inet6_skb_msgname
,
1055 .af_supported
= sctp_inet6_af_supported
,
1056 .cmp_addr
= sctp_inet6_cmp_addr
,
1057 .bind_verify
= sctp_inet6_bind_verify
,
1058 .send_verify
= sctp_inet6_send_verify
,
1059 .supported_addrs
= sctp_inet6_supported_addrs
,
1060 .create_accept_sk
= sctp_v6_create_accept_sk
,
1061 .addr_to_user
= sctp_v6_addr_to_user
,
1062 .to_sk_saddr
= sctp_v6_to_sk_saddr
,
1063 .to_sk_daddr
= sctp_v6_to_sk_daddr
,
1064 .af
= &sctp_af_inet6
,
1067 /* Initialize IPv6 support and register with socket layer. */
1068 void sctp_v6_pf_init(void)
1070 /* Register the SCTP specific PF_INET6 functions. */
1071 sctp_register_pf(&sctp_pf_inet6
, PF_INET6
);
1073 /* Register the SCTP specific AF_INET6 functions. */
1074 sctp_register_af(&sctp_af_inet6
);
1077 void sctp_v6_pf_exit(void)
1079 list_del(&sctp_af_inet6
.list
);
1082 /* Initialize IPv6 support and register with socket layer. */
1083 int sctp_v6_protosw_init(void)
1087 rc
= proto_register(&sctpv6_prot
, 1);
1091 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1092 inet6_register_protosw(&sctpv6_seqpacket_protosw
);
1093 inet6_register_protosw(&sctpv6_stream_protosw
);
1098 void sctp_v6_protosw_exit(void)
1100 inet6_unregister_protosw(&sctpv6_seqpacket_protosw
);
1101 inet6_unregister_protosw(&sctpv6_stream_protosw
);
1102 proto_unregister(&sctpv6_prot
);
1106 /* Register with inet6 layer. */
1107 int sctp_v6_add_protocol(void)
1109 /* Register notifier for inet6 address additions/deletions. */
1110 register_inet6addr_notifier(&sctp_inet6addr_notifier
);
1112 if (inet6_add_protocol(&sctpv6_protocol
, IPPROTO_SCTP
) < 0)
1118 /* Unregister with inet6 layer. */
1119 void sctp_v6_del_protocol(void)
1121 inet6_del_protocol(&sctpv6_protocol
, IPPROTO_SCTP
);
1122 unregister_inet6addr_notifier(&sctp_inet6addr_notifier
);