1 /* SCTP kernel reference Implementation
2 * (C) Copyright IBM Corp. 2002, 2004
3 * Copyright (c) 2001 Nokia, Inc.
4 * Copyright (c) 2001 La Monte H.P. Yarroll
5 * Copyright (c) 2002-2003 Intel Corp.
7 * This file is part of the SCTP kernel reference Implementation
11 * The SCTP reference implementation is free software;
12 * you can redistribute it and/or modify it under the terms of
13 * the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * The SCTP reference implementation is distributed in the hope that it
18 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
19 * ************************
20 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
21 * See the GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with GNU CC; see the file COPYING. If not, write to
25 * the Free Software Foundation, 59 Temple Place - Suite 330,
26 * Boston, MA 02111-1307, USA.
28 * Please send any bug reports or fixes you make to the
30 * lksctp developers <lksctp-developers@lists.sourceforge.net>
32 * Or submit a bug report through the following website:
33 * http://www.sf.net/projects/lksctp
35 * Written or modified by:
36 * Le Yanqun <yanqun.le@nokia.com>
37 * Hui Huang <hui.huang@nokia.com>
38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Sridhar Samudrala <sri@us.ibm.com>
40 * Jon Grimm <jgrimm@us.ibm.com>
41 * Ardelle Fan <ardelle.fan@intel.com>
44 * linux/net/ipv6/tcp_ipv6.c
46 * Any bugs reported given to us we will try to fix... any fixes shared will
47 * be incorporated into the next SCTP release.
50 #include <linux/module.h>
51 #include <linux/errno.h>
52 #include <linux/types.h>
53 #include <linux/socket.h>
54 #include <linux/sockios.h>
55 #include <linux/net.h>
56 #include <linux/sched.h>
58 #include <linux/in6.h>
59 #include <linux/netdevice.h>
60 #include <linux/init.h>
61 #include <linux/ipsec.h>
63 #include <linux/ipv6.h>
64 #include <linux/icmpv6.h>
65 #include <linux/random.h>
66 #include <linux/seq_file.h>
68 #include <net/protocol.h>
69 #include <net/ndisc.h>
72 #include <net/transp_v6.h>
73 #include <net/addrconf.h>
74 #include <net/ip6_route.h>
75 #include <net/inet_common.h>
76 #include <net/inet_ecn.h>
77 #include <net/sctp/sctp.h>
79 #include <asm/uaccess.h>
81 static struct notifier_block sctp_inet6addr_notifier
= {
82 .notifier_call
= sctp_inetaddr_event
,
85 /* ICMP error handler. */
86 SCTP_STATIC
void sctp_v6_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
87 int type
, int code
, int offset
, __be32 info
)
89 struct inet6_dev
*idev
;
90 struct ipv6hdr
*iph
= (struct ipv6hdr
*)skb
->data
;
91 struct sctphdr
*sh
= (struct sctphdr
*)(skb
->data
+ offset
);
93 struct sctp_association
*asoc
;
94 struct sctp_transport
*transport
;
95 struct ipv6_pinfo
*np
;
96 char *saveip
, *savesctp
;
99 idev
= in6_dev_get(skb
->dev
);
101 /* Fix up skb to look at the embedded net header. */
102 saveip
= skb
->nh
.raw
;
103 savesctp
= skb
->h
.raw
;
105 skb
->h
.raw
= (char *)sh
;
106 sk
= sctp_err_lookup(AF_INET6
, skb
, sh
, &asoc
, &transport
);
107 /* Put back, the original pointers. */
108 skb
->nh
.raw
= saveip
;
109 skb
->h
.raw
= savesctp
;
111 ICMP6_INC_STATS_BH(idev
, ICMP6_MIB_INERRORS
);
115 /* Warning: The sock lock is held. Remember to call
120 case ICMPV6_PKT_TOOBIG
:
121 sctp_icmp_frag_needed(sk
, asoc
, transport
, ntohl(info
));
123 case ICMPV6_PARAMPROB
:
124 if (ICMPV6_UNK_NEXTHDR
== code
) {
125 sctp_icmp_proto_unreachable(sk
, asoc
, transport
);
134 icmpv6_err_convert(type
, code
, &err
);
135 if (!sock_owned_by_user(sk
) && np
->recverr
) {
137 sk
->sk_error_report(sk
);
138 } else { /* Only an error on timeout */
139 sk
->sk_err_soft
= err
;
143 sctp_err_finish(sk
, asoc
);
145 if (likely(idev
!= NULL
))
149 /* Based on tcp_v6_xmit() in tcp_ipv6.c. */
150 static int sctp_v6_xmit(struct sk_buff
*skb
, struct sctp_transport
*transport
,
153 struct sock
*sk
= skb
->sk
;
154 struct ipv6_pinfo
*np
= inet6_sk(sk
);
157 memset(&fl
, 0, sizeof(fl
));
159 fl
.proto
= sk
->sk_protocol
;
161 /* Fill in the dest address from the route entry passed with the skb
162 * and the source address from the transport.
164 ipv6_addr_copy(&fl
.fl6_dst
, &transport
->ipaddr
.v6
.sin6_addr
);
165 ipv6_addr_copy(&fl
.fl6_src
, &transport
->saddr
.v6
.sin6_addr
);
167 fl
.fl6_flowlabel
= np
->flow_label
;
168 IP6_ECN_flow_xmit(sk
, fl
.fl6_flowlabel
);
169 if (ipv6_addr_type(&fl
.fl6_src
) & IPV6_ADDR_LINKLOCAL
)
170 fl
.oif
= transport
->saddr
.v6
.sin6_scope_id
;
172 fl
.oif
= sk
->sk_bound_dev_if
;
174 if (np
->opt
&& np
->opt
->srcrt
) {
175 struct rt0_hdr
*rt0
= (struct rt0_hdr
*) np
->opt
->srcrt
;
176 ipv6_addr_copy(&fl
.fl6_dst
, rt0
->addr
);
179 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
180 "src:" NIP6_FMT
" dst:" NIP6_FMT
"\n",
181 __FUNCTION__
, skb
, skb
->len
,
182 NIP6(fl
.fl6_src
), NIP6(fl
.fl6_dst
));
184 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS
);
186 return ip6_xmit(sk
, skb
, &fl
, np
->opt
, ipfragok
);
189 /* Returns the dst cache entry for the given source and destination ip
192 static struct dst_entry
*sctp_v6_get_dst(struct sctp_association
*asoc
,
193 union sctp_addr
*daddr
,
194 union sctp_addr
*saddr
)
196 struct dst_entry
*dst
;
199 memset(&fl
, 0, sizeof(fl
));
200 ipv6_addr_copy(&fl
.fl6_dst
, &daddr
->v6
.sin6_addr
);
201 if (ipv6_addr_type(&daddr
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
202 fl
.oif
= daddr
->v6
.sin6_scope_id
;
205 SCTP_DEBUG_PRINTK("%s: DST=" NIP6_FMT
" ",
206 __FUNCTION__
, NIP6(fl
.fl6_dst
));
209 ipv6_addr_copy(&fl
.fl6_src
, &saddr
->v6
.sin6_addr
);
211 "SRC=" NIP6_FMT
" - ",
215 dst
= ip6_route_output(NULL
, &fl
);
218 rt
= (struct rt6_info
*)dst
;
220 "rt6_dst:" NIP6_FMT
" rt6_src:" NIP6_FMT
"\n",
221 NIP6(rt
->rt6i_dst
.addr
), NIP6(rt
->rt6i_src
.addr
));
224 SCTP_DEBUG_PRINTK("NO ROUTE\n");
229 /* Returns the number of consecutive initial bits that match in the 2 ipv6
232 static inline int sctp_v6_addr_match_len(union sctp_addr
*s1
,
235 struct in6_addr
*a1
= &s1
->v6
.sin6_addr
;
236 struct in6_addr
*a2
= &s2
->v6
.sin6_addr
;
239 for (i
= 0; i
< 4 ; i
++) {
242 a1xora2
= a1
->s6_addr32
[i
] ^ a2
->s6_addr32
[i
];
244 if ((j
= fls(ntohl(a1xora2
))))
245 return (i
* 32 + 32 - j
);
251 /* Fills in the source address(saddr) based on the destination address(daddr)
252 * and asoc's bind address list.
254 static void sctp_v6_get_saddr(struct sctp_association
*asoc
,
255 struct dst_entry
*dst
,
256 union sctp_addr
*daddr
,
257 union sctp_addr
*saddr
)
259 struct sctp_bind_addr
*bp
;
261 struct sctp_sockaddr_entry
*laddr
;
262 struct list_head
*pos
;
264 union sctp_addr
*baddr
= NULL
;
268 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
269 "daddr:" NIP6_FMT
" ",
270 __FUNCTION__
, asoc
, dst
, NIP6(daddr
->v6
.sin6_addr
));
273 ipv6_get_saddr(dst
, &daddr
->v6
.sin6_addr
,&saddr
->v6
.sin6_addr
);
274 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT
"\n",
275 NIP6(saddr
->v6
.sin6_addr
));
279 scope
= sctp_scope(daddr
);
281 bp
= &asoc
->base
.bind_addr
;
282 addr_lock
= &asoc
->base
.addr_lock
;
284 /* Go through the bind address list and find the best source address
285 * that matches the scope of the destination address.
287 sctp_read_lock(addr_lock
);
288 list_for_each(pos
, &bp
->address_list
) {
289 laddr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
290 if ((laddr
->use_as_src
) &&
291 (laddr
->a
.sa
.sa_family
== AF_INET6
) &&
292 (scope
<= sctp_scope(&laddr
->a
))) {
293 bmatchlen
= sctp_v6_addr_match_len(daddr
, &laddr
->a
);
294 if (!baddr
|| (matchlen
< bmatchlen
)) {
296 matchlen
= bmatchlen
;
302 memcpy(saddr
, baddr
, sizeof(union sctp_addr
));
303 SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT
"\n",
304 NIP6(saddr
->v6
.sin6_addr
));
306 printk(KERN_ERR
"%s: asoc:%p Could not find a valid source "
307 "address for the dest:" NIP6_FMT
"\n",
308 __FUNCTION__
, asoc
, NIP6(daddr
->v6
.sin6_addr
));
311 sctp_read_unlock(addr_lock
);
314 /* Make a copy of all potential local addresses. */
315 static void sctp_v6_copy_addrlist(struct list_head
*addrlist
,
316 struct net_device
*dev
)
318 struct inet6_dev
*in6_dev
;
319 struct inet6_ifaddr
*ifp
;
320 struct sctp_sockaddr_entry
*addr
;
323 if ((in6_dev
= __in6_dev_get(dev
)) == NULL
) {
328 read_lock(&in6_dev
->lock
);
329 for (ifp
= in6_dev
->addr_list
; ifp
; ifp
= ifp
->if_next
) {
330 /* Add the address to the local list. */
331 addr
= t_new(struct sctp_sockaddr_entry
, GFP_ATOMIC
);
333 addr
->a
.v6
.sin6_family
= AF_INET6
;
334 addr
->a
.v6
.sin6_port
= 0;
335 addr
->a
.v6
.sin6_addr
= ifp
->addr
;
336 addr
->a
.v6
.sin6_scope_id
= dev
->ifindex
;
337 INIT_LIST_HEAD(&addr
->list
);
338 list_add_tail(&addr
->list
, addrlist
);
342 read_unlock(&in6_dev
->lock
);
346 /* Initialize a sockaddr_storage from in incoming skb. */
347 static void sctp_v6_from_skb(union sctp_addr
*addr
,struct sk_buff
*skb
,
354 port
= &addr
->v6
.sin6_port
;
355 addr
->v6
.sin6_family
= AF_INET6
;
356 addr
->v6
.sin6_flowinfo
= 0; /* FIXME */
357 addr
->v6
.sin6_scope_id
= ((struct inet6_skb_parm
*)skb
->cb
)->iif
;
359 sh
= (struct sctphdr
*) skb
->h
.raw
;
362 from
= &skb
->nh
.ipv6h
->saddr
;
365 from
= &skb
->nh
.ipv6h
->daddr
;
367 ipv6_addr_copy(&addr
->v6
.sin6_addr
, from
);
370 /* Initialize an sctp_addr from a socket. */
371 static void sctp_v6_from_sk(union sctp_addr
*addr
, struct sock
*sk
)
373 addr
->v6
.sin6_family
= AF_INET6
;
374 addr
->v6
.sin6_port
= inet_sk(sk
)->num
;
375 addr
->v6
.sin6_addr
= inet6_sk(sk
)->rcv_saddr
;
378 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
379 static void sctp_v6_to_sk_saddr(union sctp_addr
*addr
, struct sock
*sk
)
381 if (addr
->sa
.sa_family
== AF_INET
&& sctp_sk(sk
)->v4mapped
) {
382 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[0] = 0;
383 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[1] = 0;
384 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[2] = htonl(0x0000ffff);
385 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[3] =
386 addr
->v4
.sin_addr
.s_addr
;
388 inet6_sk(sk
)->rcv_saddr
= addr
->v6
.sin6_addr
;
392 /* Initialize sk->sk_daddr from sctp_addr. */
393 static void sctp_v6_to_sk_daddr(union sctp_addr
*addr
, struct sock
*sk
)
395 if (addr
->sa
.sa_family
== AF_INET
&& sctp_sk(sk
)->v4mapped
) {
396 inet6_sk(sk
)->daddr
.s6_addr32
[0] = 0;
397 inet6_sk(sk
)->daddr
.s6_addr32
[1] = 0;
398 inet6_sk(sk
)->daddr
.s6_addr32
[2] = htonl(0x0000ffff);
399 inet6_sk(sk
)->daddr
.s6_addr32
[3] = addr
->v4
.sin_addr
.s_addr
;
401 inet6_sk(sk
)->daddr
= addr
->v6
.sin6_addr
;
405 /* Initialize a sctp_addr from an address parameter. */
406 static void sctp_v6_from_addr_param(union sctp_addr
*addr
,
407 union sctp_addr_param
*param
,
408 __be16 port
, int iif
)
410 addr
->v6
.sin6_family
= AF_INET6
;
411 addr
->v6
.sin6_port
= port
;
412 addr
->v6
.sin6_flowinfo
= 0; /* BUG */
413 ipv6_addr_copy(&addr
->v6
.sin6_addr
, ¶m
->v6
.addr
);
414 addr
->v6
.sin6_scope_id
= iif
;
417 /* Initialize an address parameter from a sctp_addr and return the length
418 * of the address parameter.
420 static int sctp_v6_to_addr_param(const union sctp_addr
*addr
,
421 union sctp_addr_param
*param
)
423 int length
= sizeof(sctp_ipv6addr_param_t
);
425 param
->v6
.param_hdr
.type
= SCTP_PARAM_IPV6_ADDRESS
;
426 param
->v6
.param_hdr
.length
= htons(length
);
427 ipv6_addr_copy(¶m
->v6
.addr
, &addr
->v6
.sin6_addr
);
432 /* Initialize a sctp_addr from a dst_entry. */
433 static void sctp_v6_dst_saddr(union sctp_addr
*addr
, struct dst_entry
*dst
,
436 struct rt6_info
*rt
= (struct rt6_info
*)dst
;
437 addr
->sa
.sa_family
= AF_INET6
;
438 addr
->v6
.sin6_port
= port
;
439 ipv6_addr_copy(&addr
->v6
.sin6_addr
, &rt
->rt6i_src
.addr
);
442 /* Compare addresses exactly.
443 * v4-mapped-v6 is also in consideration.
445 static int sctp_v6_cmp_addr(const union sctp_addr
*addr1
,
446 const union sctp_addr
*addr2
)
448 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
) {
449 if (addr1
->sa
.sa_family
== AF_INET
&&
450 addr2
->sa
.sa_family
== AF_INET6
&&
451 IPV6_ADDR_MAPPED
== ipv6_addr_type(&addr2
->v6
.sin6_addr
)) {
452 if (addr2
->v6
.sin6_port
== addr1
->v4
.sin_port
&&
453 addr2
->v6
.sin6_addr
.s6_addr32
[3] ==
454 addr1
->v4
.sin_addr
.s_addr
)
457 if (addr2
->sa
.sa_family
== AF_INET
&&
458 addr1
->sa
.sa_family
== AF_INET6
&&
459 IPV6_ADDR_MAPPED
== ipv6_addr_type(&addr1
->v6
.sin6_addr
)) {
460 if (addr1
->v6
.sin6_port
== addr2
->v4
.sin_port
&&
461 addr1
->v6
.sin6_addr
.s6_addr32
[3] ==
462 addr2
->v4
.sin_addr
.s_addr
)
467 if (!ipv6_addr_equal(&addr1
->v6
.sin6_addr
, &addr2
->v6
.sin6_addr
))
469 /* If this is a linklocal address, compare the scope_id. */
470 if (ipv6_addr_type(&addr1
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
) {
471 if (addr1
->v6
.sin6_scope_id
&& addr2
->v6
.sin6_scope_id
&&
472 (addr1
->v6
.sin6_scope_id
!= addr2
->v6
.sin6_scope_id
)) {
480 /* Initialize addr struct to INADDR_ANY. */
481 static void sctp_v6_inaddr_any(union sctp_addr
*addr
, unsigned short port
)
483 memset(addr
, 0x00, sizeof(union sctp_addr
));
484 addr
->v6
.sin6_family
= AF_INET6
;
485 addr
->v6
.sin6_port
= port
;
488 /* Is this a wildcard address? */
489 static int sctp_v6_is_any(const union sctp_addr
*addr
)
491 return ipv6_addr_any(&addr
->v6
.sin6_addr
);
494 /* Should this be available for binding? */
495 static int sctp_v6_available(union sctp_addr
*addr
, struct sctp_sock
*sp
)
498 struct in6_addr
*in6
= (struct in6_addr
*)&addr
->v6
.sin6_addr
;
500 type
= ipv6_addr_type(in6
);
501 if (IPV6_ADDR_ANY
== type
)
503 if (type
== IPV6_ADDR_MAPPED
) {
504 if (sp
&& !sp
->v4mapped
)
506 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
508 sctp_v6_map_v4(addr
);
509 return sctp_get_af_specific(AF_INET
)->available(addr
, sp
);
511 if (!(type
& IPV6_ADDR_UNICAST
))
514 return ipv6_chk_addr(in6
, NULL
, 0);
517 /* This function checks if the address is a valid address to be used for
521 * Return 0 - If the address is a non-unicast or an illegal address.
522 * Return 1 - If the address is a unicast.
524 static int sctp_v6_addr_valid(union sctp_addr
*addr
,
525 struct sctp_sock
*sp
,
526 const struct sk_buff
*skb
)
528 int ret
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
530 /* Support v4-mapped-v6 address. */
531 if (ret
== IPV6_ADDR_MAPPED
) {
532 /* Note: This routine is used in input, so v4-mapped-v6
533 * are disallowed here when there is no sctp_sock.
535 if (!sp
|| !sp
->v4mapped
)
537 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
539 sctp_v6_map_v4(addr
);
540 return sctp_get_af_specific(AF_INET
)->addr_valid(addr
, sp
, skb
);
543 /* Is this a non-unicast address */
544 if (!(ret
& IPV6_ADDR_UNICAST
))
550 /* What is the scope of 'addr'? */
551 static sctp_scope_t
sctp_v6_scope(union sctp_addr
*addr
)
556 /* The IPv6 scope is really a set of bit fields.
557 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
560 v6scope
= ipv6_addr_scope(&addr
->v6
.sin6_addr
);
563 retval
= SCTP_SCOPE_LOOPBACK
;
566 retval
= SCTP_SCOPE_LINK
;
569 retval
= SCTP_SCOPE_PRIVATE
;
572 retval
= SCTP_SCOPE_GLOBAL
;
579 /* Create and initialize a new sk for the socket to be returned by accept(). */
580 static struct sock
*sctp_v6_create_accept_sk(struct sock
*sk
,
581 struct sctp_association
*asoc
)
583 struct inet_sock
*inet
= inet_sk(sk
);
585 struct inet_sock
*newinet
;
586 struct ipv6_pinfo
*newnp
, *np
= inet6_sk(sk
);
587 struct sctp6_sock
*newsctp6sk
;
589 newsk
= sk_alloc(PF_INET6
, GFP_KERNEL
, sk
->sk_prot
, 1);
593 sock_init_data(NULL
, newsk
);
595 newsk
->sk_type
= SOCK_STREAM
;
597 newsk
->sk_prot
= sk
->sk_prot
;
598 newsk
->sk_no_check
= sk
->sk_no_check
;
599 newsk
->sk_reuse
= sk
->sk_reuse
;
601 newsk
->sk_destruct
= inet_sock_destruct
;
602 newsk
->sk_family
= PF_INET6
;
603 newsk
->sk_protocol
= IPPROTO_SCTP
;
604 newsk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
605 newsk
->sk_shutdown
= sk
->sk_shutdown
;
606 sock_reset_flag(sk
, SOCK_ZAPPED
);
608 newsctp6sk
= (struct sctp6_sock
*)newsk
;
609 inet_sk(newsk
)->pinet6
= &newsctp6sk
->inet6
;
611 newinet
= inet_sk(newsk
);
612 newnp
= inet6_sk(newsk
);
614 memcpy(newnp
, np
, sizeof(struct ipv6_pinfo
));
616 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
619 newinet
->sport
= inet
->sport
;
620 newnp
->saddr
= np
->saddr
;
621 newnp
->rcv_saddr
= np
->rcv_saddr
;
622 newinet
->dport
= htons(asoc
->peer
.port
);
623 sctp_v6_to_sk_daddr(&asoc
->peer
.primary_addr
, newsk
);
625 /* Init the ipv4 part of the socket since we can have sockets
626 * using v6 API for ipv4.
628 newinet
->uc_ttl
= -1;
629 newinet
->mc_loop
= 1;
631 newinet
->mc_index
= 0;
632 newinet
->mc_list
= NULL
;
634 if (ipv4_config
.no_pmtu_disc
)
635 newinet
->pmtudisc
= IP_PMTUDISC_DONT
;
637 newinet
->pmtudisc
= IP_PMTUDISC_WANT
;
639 sk_refcnt_debug_inc(newsk
);
641 if (newsk
->sk_prot
->init(newsk
)) {
642 sk_common_release(newsk
);
650 /* Map v4 address to mapped v6 address */
651 static void sctp_v6_addr_v4map(struct sctp_sock
*sp
, union sctp_addr
*addr
)
653 if (sp
->v4mapped
&& AF_INET
== addr
->sa
.sa_family
)
654 sctp_v4_map_v6(addr
);
657 /* Where did this skb come from? */
658 static int sctp_v6_skb_iif(const struct sk_buff
*skb
)
660 struct inet6_skb_parm
*opt
= (struct inet6_skb_parm
*) skb
->cb
;
664 /* Was this packet marked by Explicit Congestion Notification? */
665 static int sctp_v6_is_ce(const struct sk_buff
*skb
)
667 return *((__u32
*)(skb
->nh
.ipv6h
)) & htonl(1<<20);
670 /* Dump the v6 addr to the seq file. */
671 static void sctp_v6_seq_dump_addr(struct seq_file
*seq
, union sctp_addr
*addr
)
673 seq_printf(seq
, NIP6_FMT
" ", NIP6(addr
->v6
.sin6_addr
));
676 /* Initialize a PF_INET6 socket msg_name. */
677 static void sctp_inet6_msgname(char *msgname
, int *addr_len
)
679 struct sockaddr_in6
*sin6
;
681 sin6
= (struct sockaddr_in6
*)msgname
;
682 sin6
->sin6_family
= AF_INET6
;
683 sin6
->sin6_flowinfo
= 0;
684 sin6
->sin6_scope_id
= 0; /*FIXME */
685 *addr_len
= sizeof(struct sockaddr_in6
);
688 /* Initialize a PF_INET msgname from a ulpevent. */
689 static void sctp_inet6_event_msgname(struct sctp_ulpevent
*event
,
690 char *msgname
, int *addrlen
)
692 struct sockaddr_in6
*sin6
, *sin6from
;
695 union sctp_addr
*addr
;
696 struct sctp_association
*asoc
;
699 sctp_inet6_msgname(msgname
, addrlen
);
700 sin6
= (struct sockaddr_in6
*)msgname
;
701 sin6
->sin6_port
= htons(asoc
->peer
.port
);
702 addr
= &asoc
->peer
.primary_addr
;
704 /* Note: If we go to a common v6 format, this code
708 /* Map ipv4 address into v4-mapped-on-v6 address. */
709 if (sctp_sk(asoc
->base
.sk
)->v4mapped
&&
710 AF_INET
== addr
->sa
.sa_family
) {
711 sctp_v4_map_v6((union sctp_addr
*)sin6
);
712 sin6
->sin6_addr
.s6_addr32
[3] =
713 addr
->v4
.sin_addr
.s_addr
;
717 sin6from
= &asoc
->peer
.primary_addr
.v6
;
718 ipv6_addr_copy(&sin6
->sin6_addr
, &sin6from
->sin6_addr
);
719 if (ipv6_addr_type(&sin6
->sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
720 sin6
->sin6_scope_id
= sin6from
->sin6_scope_id
;
724 /* Initialize a msg_name from an inbound skb. */
725 static void sctp_inet6_skb_msgname(struct sk_buff
*skb
, char *msgname
,
729 struct sockaddr_in6
*sin6
;
732 sctp_inet6_msgname(msgname
, addr_len
);
733 sin6
= (struct sockaddr_in6
*)msgname
;
734 sh
= (struct sctphdr
*)skb
->h
.raw
;
735 sin6
->sin6_port
= sh
->source
;
737 /* Map ipv4 address into v4-mapped-on-v6 address. */
738 if (sctp_sk(skb
->sk
)->v4mapped
&&
739 skb
->nh
.iph
->version
== 4) {
740 sctp_v4_map_v6((union sctp_addr
*)sin6
);
741 sin6
->sin6_addr
.s6_addr32
[3] = skb
->nh
.iph
->saddr
;
745 /* Otherwise, just copy the v6 address. */
746 ipv6_addr_copy(&sin6
->sin6_addr
, &skb
->nh
.ipv6h
->saddr
);
747 if (ipv6_addr_type(&sin6
->sin6_addr
) & IPV6_ADDR_LINKLOCAL
) {
748 struct sctp_ulpevent
*ev
= sctp_skb2event(skb
);
749 sin6
->sin6_scope_id
= ev
->iif
;
754 /* Do we support this AF? */
755 static int sctp_inet6_af_supported(sa_family_t family
, struct sctp_sock
*sp
)
760 /* v4-mapped-v6 addresses */
762 if (!__ipv6_only_sock(sctp_opt2sk(sp
)) && sp
->v4mapped
)
769 /* Address matching with wildcards allowed. This extra level
770 * of indirection lets us choose whether a PF_INET6 should
771 * disallow any v4 addresses if we so choose.
773 static int sctp_inet6_cmp_addr(const union sctp_addr
*addr1
,
774 const union sctp_addr
*addr2
,
775 struct sctp_sock
*opt
)
777 struct sctp_af
*af1
, *af2
;
779 af1
= sctp_get_af_specific(addr1
->sa
.sa_family
);
780 af2
= sctp_get_af_specific(addr2
->sa
.sa_family
);
784 /* Today, wildcard AF_INET/AF_INET6. */
785 if (sctp_is_any(addr1
) || sctp_is_any(addr2
))
788 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
)
791 return af1
->cmp_addr(addr1
, addr2
);
794 /* Verify that the provided sockaddr looks bindable. Common verification,
795 * has already been taken care of.
797 static int sctp_inet6_bind_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
801 /* ASSERT: address family has already been verified. */
802 if (addr
->sa
.sa_family
!= AF_INET6
)
803 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
805 int type
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
806 struct net_device
*dev
;
808 if (type
& IPV6_ADDR_LINKLOCAL
) {
809 if (!addr
->v6
.sin6_scope_id
)
811 dev
= dev_get_by_index(addr
->v6
.sin6_scope_id
);
818 return af
->available(addr
, opt
);
821 /* Verify that the provided sockaddr looks sendable. Common verification,
822 * has already been taken care of.
824 static int sctp_inet6_send_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
826 struct sctp_af
*af
= NULL
;
828 /* ASSERT: address family has already been verified. */
829 if (addr
->sa
.sa_family
!= AF_INET6
)
830 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
832 int type
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
833 struct net_device
*dev
;
835 if (type
& IPV6_ADDR_LINKLOCAL
) {
836 if (!addr
->v6
.sin6_scope_id
)
838 dev
= dev_get_by_index(addr
->v6
.sin6_scope_id
);
849 /* Fill in Supported Address Type information for INIT and INIT-ACK
850 * chunks. Note: In the future, we may want to look at sock options
851 * to determine whether a PF_INET6 socket really wants to have IPV4
853 * Returns number of addresses supported.
855 static int sctp_inet6_supported_addrs(const struct sctp_sock
*opt
,
858 types
[0] = SCTP_PARAM_IPV4_ADDRESS
;
859 types
[1] = SCTP_PARAM_IPV6_ADDRESS
;
863 static const struct proto_ops inet6_seqpacket_ops
= {
865 .owner
= THIS_MODULE
,
866 .release
= inet6_release
,
868 .connect
= inet_dgram_connect
,
869 .socketpair
= sock_no_socketpair
,
870 .accept
= inet_accept
,
871 .getname
= inet6_getname
,
873 .ioctl
= inet6_ioctl
,
874 .listen
= sctp_inet_listen
,
875 .shutdown
= inet_shutdown
,
876 .setsockopt
= sock_common_setsockopt
,
877 .getsockopt
= sock_common_getsockopt
,
878 .sendmsg
= inet_sendmsg
,
879 .recvmsg
= sock_common_recvmsg
,
880 .mmap
= sock_no_mmap
,
882 .compat_setsockopt
= compat_sock_common_setsockopt
,
883 .compat_getsockopt
= compat_sock_common_getsockopt
,
887 static struct inet_protosw sctpv6_seqpacket_protosw
= {
888 .type
= SOCK_SEQPACKET
,
889 .protocol
= IPPROTO_SCTP
,
890 .prot
= &sctpv6_prot
,
891 .ops
= &inet6_seqpacket_ops
,
894 .flags
= SCTP_PROTOSW_FLAG
896 static struct inet_protosw sctpv6_stream_protosw
= {
898 .protocol
= IPPROTO_SCTP
,
899 .prot
= &sctpv6_prot
,
900 .ops
= &inet6_seqpacket_ops
,
903 .flags
= SCTP_PROTOSW_FLAG
,
906 static int sctp6_rcv(struct sk_buff
**pskb
)
908 return sctp_rcv(*pskb
) ? -1 : 0;
911 static struct inet6_protocol sctpv6_protocol
= {
912 .handler
= sctp6_rcv
,
913 .err_handler
= sctp_v6_err
,
914 .flags
= INET6_PROTO_NOPOLICY
| INET6_PROTO_FINAL
,
917 static struct sctp_af sctp_ipv6_specific
= {
918 .sa_family
= AF_INET6
,
919 .sctp_xmit
= sctp_v6_xmit
,
920 .setsockopt
= ipv6_setsockopt
,
921 .getsockopt
= ipv6_getsockopt
,
922 .get_dst
= sctp_v6_get_dst
,
923 .get_saddr
= sctp_v6_get_saddr
,
924 .copy_addrlist
= sctp_v6_copy_addrlist
,
925 .from_skb
= sctp_v6_from_skb
,
926 .from_sk
= sctp_v6_from_sk
,
927 .to_sk_saddr
= sctp_v6_to_sk_saddr
,
928 .to_sk_daddr
= sctp_v6_to_sk_daddr
,
929 .from_addr_param
= sctp_v6_from_addr_param
,
930 .to_addr_param
= sctp_v6_to_addr_param
,
931 .dst_saddr
= sctp_v6_dst_saddr
,
932 .cmp_addr
= sctp_v6_cmp_addr
,
933 .scope
= sctp_v6_scope
,
934 .addr_valid
= sctp_v6_addr_valid
,
935 .inaddr_any
= sctp_v6_inaddr_any
,
936 .is_any
= sctp_v6_is_any
,
937 .available
= sctp_v6_available
,
938 .skb_iif
= sctp_v6_skb_iif
,
939 .is_ce
= sctp_v6_is_ce
,
940 .seq_dump_addr
= sctp_v6_seq_dump_addr
,
941 .net_header_len
= sizeof(struct ipv6hdr
),
942 .sockaddr_len
= sizeof(struct sockaddr_in6
),
944 .compat_setsockopt
= compat_ipv6_setsockopt
,
945 .compat_getsockopt
= compat_ipv6_getsockopt
,
949 static struct sctp_pf sctp_pf_inet6_specific
= {
950 .event_msgname
= sctp_inet6_event_msgname
,
951 .skb_msgname
= sctp_inet6_skb_msgname
,
952 .af_supported
= sctp_inet6_af_supported
,
953 .cmp_addr
= sctp_inet6_cmp_addr
,
954 .bind_verify
= sctp_inet6_bind_verify
,
955 .send_verify
= sctp_inet6_send_verify
,
956 .supported_addrs
= sctp_inet6_supported_addrs
,
957 .create_accept_sk
= sctp_v6_create_accept_sk
,
958 .addr_v4map
= sctp_v6_addr_v4map
,
959 .af
= &sctp_ipv6_specific
,
962 /* Initialize IPv6 support and register with inet6 stack. */
963 int sctp_v6_init(void)
965 int rc
= proto_register(&sctpv6_prot
, 1);
969 /* Register inet6 protocol. */
971 if (inet6_add_protocol(&sctpv6_protocol
, IPPROTO_SCTP
) < 0)
972 goto out_unregister_sctp_proto
;
974 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
975 inet6_register_protosw(&sctpv6_seqpacket_protosw
);
976 inet6_register_protosw(&sctpv6_stream_protosw
);
978 /* Register the SCTP specific PF_INET6 functions. */
979 sctp_register_pf(&sctp_pf_inet6_specific
, PF_INET6
);
981 /* Register the SCTP specific AF_INET6 functions. */
982 sctp_register_af(&sctp_ipv6_specific
);
984 /* Register notifier for inet6 address additions/deletions. */
985 register_inet6addr_notifier(&sctp_inet6addr_notifier
);
989 out_unregister_sctp_proto
:
990 proto_unregister(&sctpv6_prot
);
994 /* IPv6 specific exit support. */
995 void sctp_v6_exit(void)
997 list_del(&sctp_ipv6_specific
.list
);
998 inet6_del_protocol(&sctpv6_protocol
, IPPROTO_SCTP
);
999 inet6_unregister_protosw(&sctpv6_seqpacket_protosw
);
1000 inet6_unregister_protosw(&sctpv6_stream_protosw
);
1001 unregister_inet6addr_notifier(&sctp_inet6addr_notifier
);
1002 proto_unregister(&sctpv6_prot
);