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, 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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
52 #include <linux/module.h>
53 #include <linux/errno.h>
54 #include <linux/types.h>
55 #include <linux/socket.h>
56 #include <linux/sockios.h>
57 #include <linux/net.h>
59 #include <linux/in6.h>
60 #include <linux/netdevice.h>
61 #include <linux/init.h>
62 #include <linux/ipsec.h>
63 #include <linux/slab.h>
65 #include <linux/ipv6.h>
66 #include <linux/icmpv6.h>
67 #include <linux/random.h>
68 #include <linux/seq_file.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
74 #include <net/transp_v6.h>
75 #include <net/addrconf.h>
76 #include <net/ip6_route.h>
77 #include <net/inet_common.h>
78 #include <net/inet_ecn.h>
79 #include <net/sctp/sctp.h>
81 #include <asm/uaccess.h>
83 static inline int sctp_v6_addr_match_len(union sctp_addr
*s1
,
85 static void sctp_v6_to_addr(union sctp_addr
*addr
, struct in6_addr
*saddr
,
87 static int sctp_v6_cmp_addr(const union sctp_addr
*addr1
,
88 const union sctp_addr
*addr2
);
90 /* Event handler for inet6 address addition/deletion events.
91 * The sctp_local_addr_list needs to be protocted by a spin lock since
92 * multiple notifiers (say IPv4 and IPv6) may be running at the same
93 * time and thus corrupt the list.
94 * The reader side is protected with RCU.
96 static int sctp_inet6addr_event(struct notifier_block
*this, unsigned long ev
,
99 struct inet6_ifaddr
*ifa
= (struct inet6_ifaddr
*)ptr
;
100 struct sctp_sockaddr_entry
*addr
= NULL
;
101 struct sctp_sockaddr_entry
*temp
;
106 addr
= kmalloc(sizeof(struct sctp_sockaddr_entry
), GFP_ATOMIC
);
108 addr
->a
.v6
.sin6_family
= AF_INET6
;
109 addr
->a
.v6
.sin6_port
= 0;
110 ipv6_addr_copy(&addr
->a
.v6
.sin6_addr
, &ifa
->addr
);
111 addr
->a
.v6
.sin6_scope_id
= ifa
->idev
->dev
->ifindex
;
113 spin_lock_bh(&sctp_local_addr_lock
);
114 list_add_tail_rcu(&addr
->list
, &sctp_local_addr_list
);
115 spin_unlock_bh(&sctp_local_addr_lock
);
119 spin_lock_bh(&sctp_local_addr_lock
);
120 list_for_each_entry_safe(addr
, temp
,
121 &sctp_local_addr_list
, list
) {
122 if (addr
->a
.sa
.sa_family
== AF_INET6
&&
123 ipv6_addr_equal(&addr
->a
.v6
.sin6_addr
,
127 list_del_rcu(&addr
->list
);
131 spin_unlock_bh(&sctp_local_addr_lock
);
133 kfree_rcu(addr
, rcu
);
140 static struct notifier_block sctp_inet6addr_notifier
= {
141 .notifier_call
= sctp_inet6addr_event
,
144 /* ICMP error handler. */
145 SCTP_STATIC
void sctp_v6_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
146 u8 type
, u8 code
, int offset
, __be32 info
)
148 struct inet6_dev
*idev
;
150 struct sctp_association
*asoc
;
151 struct sctp_transport
*transport
;
152 struct ipv6_pinfo
*np
;
153 sk_buff_data_t saveip
, savesctp
;
156 idev
= in6_dev_get(skb
->dev
);
158 /* Fix up skb to look at the embedded net header. */
159 saveip
= skb
->network_header
;
160 savesctp
= skb
->transport_header
;
161 skb_reset_network_header(skb
);
162 skb_set_transport_header(skb
, offset
);
163 sk
= sctp_err_lookup(AF_INET6
, skb
, sctp_hdr(skb
), &asoc
, &transport
);
164 /* Put back, the original pointers. */
165 skb
->network_header
= saveip
;
166 skb
->transport_header
= savesctp
;
168 ICMP6_INC_STATS_BH(dev_net(skb
->dev
), idev
, ICMP6_MIB_INERRORS
);
172 /* Warning: The sock lock is held. Remember to call
177 case ICMPV6_PKT_TOOBIG
:
178 sctp_icmp_frag_needed(sk
, asoc
, transport
, ntohl(info
));
180 case ICMPV6_PARAMPROB
:
181 if (ICMPV6_UNK_NEXTHDR
== code
) {
182 sctp_icmp_proto_unreachable(sk
, asoc
, transport
);
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
, asoc
);
202 if (likely(idev
!= NULL
))
206 /* Based on tcp_v6_xmit() in tcp_ipv6.c. */
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
);
213 memset(&fl6
, 0, sizeof(fl6
));
215 fl6
.flowi6_proto
= sk
->sk_protocol
;
217 /* Fill in the dest address from the route entry passed with the skb
218 * and the source address from the transport.
220 ipv6_addr_copy(&fl6
.daddr
, &transport
->ipaddr
.v6
.sin6_addr
);
221 ipv6_addr_copy(&fl6
.saddr
, &transport
->saddr
.v6
.sin6_addr
);
223 fl6
.flowlabel
= np
->flow_label
;
224 IP6_ECN_flow_xmit(sk
, fl6
.flowlabel
);
225 if (ipv6_addr_type(&fl6
.saddr
) & IPV6_ADDR_LINKLOCAL
)
226 fl6
.flowi6_oif
= transport
->saddr
.v6
.sin6_scope_id
;
228 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
230 if (np
->opt
&& np
->opt
->srcrt
) {
231 struct rt0_hdr
*rt0
= (struct rt0_hdr
*) np
->opt
->srcrt
;
232 ipv6_addr_copy(&fl6
.daddr
, rt0
->addr
);
235 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n",
236 __func__
, skb
, skb
->len
,
237 &fl6
.saddr
, &fl6
.daddr
);
239 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS
);
241 if (!(transport
->param_flags
& SPP_PMTUD_ENABLE
))
244 return ip6_xmit(sk
, skb
, &fl6
, np
->opt
);
247 /* Returns the dst cache entry for the given source and destination ip
250 static void sctp_v6_get_dst(struct sctp_transport
*t
, union sctp_addr
*saddr
,
251 struct flowi
*fl
, struct sock
*sk
)
253 struct sctp_association
*asoc
= t
->asoc
;
254 struct dst_entry
*dst
= NULL
;
255 struct flowi6
*fl6
= &fl
->u
.ip6
;
256 struct sctp_bind_addr
*bp
;
257 struct sctp_sockaddr_entry
*laddr
;
258 union sctp_addr
*baddr
= NULL
;
259 union sctp_addr
*daddr
= &t
->ipaddr
;
260 union sctp_addr dst_saddr
;
265 memset(fl6
, 0, sizeof(struct flowi6
));
266 ipv6_addr_copy(&fl6
->daddr
, &daddr
->v6
.sin6_addr
);
267 fl6
->fl6_dport
= daddr
->v6
.sin6_port
;
268 fl6
->flowi6_proto
= IPPROTO_SCTP
;
269 if (ipv6_addr_type(&daddr
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
270 fl6
->flowi6_oif
= daddr
->v6
.sin6_scope_id
;
272 SCTP_DEBUG_PRINTK("%s: DST=%pI6 ", __func__
, &fl6
->daddr
);
275 fl6
->fl6_sport
= htons(asoc
->base
.bind_addr
.port
);
278 ipv6_addr_copy(&fl6
->saddr
, &saddr
->v6
.sin6_addr
);
279 fl6
->fl6_sport
= saddr
->v6
.sin6_port
;
280 SCTP_DEBUG_PRINTK("SRC=%pI6 - ", &fl6
->saddr
);
283 dst
= ip6_dst_lookup_flow(sk
, fl6
, NULL
, false);
287 bp
= &asoc
->base
.bind_addr
;
288 scope
= sctp_scope(daddr
);
289 /* ip6_dst_lookup has filled in the fl6->saddr for us. Check
290 * to see if we can use it.
293 /* Walk through the bind address list and look for a bind
294 * address that matches the source address of the returned dst.
296 sctp_v6_to_addr(&dst_saddr
, &fl6
->saddr
, htons(bp
->port
));
298 list_for_each_entry_rcu(laddr
, &bp
->address_list
, list
) {
299 if (!laddr
->valid
|| (laddr
->state
!= SCTP_ADDR_SRC
))
302 /* Do not compare against v4 addrs */
303 if ((laddr
->a
.sa
.sa_family
== AF_INET6
) &&
304 (sctp_v6_cmp_addr(&dst_saddr
, &laddr
->a
))) {
310 /* None of the bound addresses match the source address of the
311 * dst. So release it.
317 /* Walk through the bind address list and try to get the
318 * best source address for a given destination.
321 list_for_each_entry_rcu(laddr
, &bp
->address_list
, list
) {
322 if (!laddr
->valid
&& laddr
->state
!= SCTP_ADDR_SRC
)
324 if ((laddr
->a
.sa
.sa_family
== AF_INET6
) &&
325 (scope
<= sctp_scope(&laddr
->a
))) {
326 bmatchlen
= sctp_v6_addr_match_len(daddr
, &laddr
->a
);
327 if (!baddr
|| (matchlen
< bmatchlen
)) {
329 matchlen
= bmatchlen
;
335 ipv6_addr_copy(&fl6
->saddr
, &baddr
->v6
.sin6_addr
);
336 fl6
->fl6_sport
= baddr
->v6
.sin6_port
;
337 dst
= ip6_dst_lookup_flow(sk
, fl6
, NULL
, false);
343 rt
= (struct rt6_info
*)dst
;
345 SCTP_DEBUG_PRINTK("rt6_dst:%pI6 rt6_src:%pI6\n",
346 &rt
->rt6i_dst
.addr
, &fl6
->saddr
);
349 SCTP_DEBUG_PRINTK("NO ROUTE\n");
353 /* Returns the number of consecutive initial bits that match in the 2 ipv6
356 static inline int sctp_v6_addr_match_len(union sctp_addr
*s1
,
359 return ipv6_addr_diff(&s1
->v6
.sin6_addr
, &s2
->v6
.sin6_addr
);
362 /* Fills in the source address(saddr) based on the destination address(daddr)
363 * and asoc's bind address list.
365 static void sctp_v6_get_saddr(struct sctp_sock
*sk
,
366 struct sctp_transport
*t
,
369 struct flowi6
*fl6
= &fl
->u
.ip6
;
370 union sctp_addr
*saddr
= &t
->saddr
;
372 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p\n", __func__
, t
->asoc
, t
->dst
);
375 saddr
->v6
.sin6_family
= AF_INET6
;
376 ipv6_addr_copy(&saddr
->v6
.sin6_addr
, &fl6
->saddr
);
380 /* Make a copy of all potential local addresses. */
381 static void sctp_v6_copy_addrlist(struct list_head
*addrlist
,
382 struct net_device
*dev
)
384 struct inet6_dev
*in6_dev
;
385 struct inet6_ifaddr
*ifp
;
386 struct sctp_sockaddr_entry
*addr
;
389 if ((in6_dev
= __in6_dev_get(dev
)) == NULL
) {
394 read_lock_bh(&in6_dev
->lock
);
395 list_for_each_entry(ifp
, &in6_dev
->addr_list
, if_list
) {
396 /* Add the address to the local list. */
397 addr
= t_new(struct sctp_sockaddr_entry
, GFP_ATOMIC
);
399 addr
->a
.v6
.sin6_family
= AF_INET6
;
400 addr
->a
.v6
.sin6_port
= 0;
401 ipv6_addr_copy(&addr
->a
.v6
.sin6_addr
, &ifp
->addr
);
402 addr
->a
.v6
.sin6_scope_id
= dev
->ifindex
;
404 INIT_LIST_HEAD(&addr
->list
);
405 list_add_tail(&addr
->list
, addrlist
);
409 read_unlock_bh(&in6_dev
->lock
);
413 /* Initialize a sockaddr_storage from in incoming skb. */
414 static void sctp_v6_from_skb(union sctp_addr
*addr
,struct sk_buff
*skb
,
421 port
= &addr
->v6
.sin6_port
;
422 addr
->v6
.sin6_family
= AF_INET6
;
423 addr
->v6
.sin6_flowinfo
= 0; /* FIXME */
424 addr
->v6
.sin6_scope_id
= ((struct inet6_skb_parm
*)skb
->cb
)->iif
;
429 from
= &ipv6_hdr(skb
)->saddr
;
432 from
= &ipv6_hdr(skb
)->daddr
;
434 ipv6_addr_copy(&addr
->v6
.sin6_addr
, from
);
437 /* Initialize an sctp_addr from a socket. */
438 static void sctp_v6_from_sk(union sctp_addr
*addr
, struct sock
*sk
)
440 addr
->v6
.sin6_family
= AF_INET6
;
441 addr
->v6
.sin6_port
= 0;
442 ipv6_addr_copy(&addr
->v6
.sin6_addr
, &inet6_sk(sk
)->rcv_saddr
);
445 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
446 static void sctp_v6_to_sk_saddr(union sctp_addr
*addr
, struct sock
*sk
)
448 if (addr
->sa
.sa_family
== AF_INET
&& sctp_sk(sk
)->v4mapped
) {
449 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[0] = 0;
450 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[1] = 0;
451 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[2] = htonl(0x0000ffff);
452 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[3] =
453 addr
->v4
.sin_addr
.s_addr
;
455 ipv6_addr_copy(&inet6_sk(sk
)->rcv_saddr
, &addr
->v6
.sin6_addr
);
459 /* Initialize sk->sk_daddr from sctp_addr. */
460 static void sctp_v6_to_sk_daddr(union sctp_addr
*addr
, struct sock
*sk
)
462 if (addr
->sa
.sa_family
== AF_INET
&& sctp_sk(sk
)->v4mapped
) {
463 inet6_sk(sk
)->daddr
.s6_addr32
[0] = 0;
464 inet6_sk(sk
)->daddr
.s6_addr32
[1] = 0;
465 inet6_sk(sk
)->daddr
.s6_addr32
[2] = htonl(0x0000ffff);
466 inet6_sk(sk
)->daddr
.s6_addr32
[3] = addr
->v4
.sin_addr
.s_addr
;
468 ipv6_addr_copy(&inet6_sk(sk
)->daddr
, &addr
->v6
.sin6_addr
);
472 /* Initialize a sctp_addr from an address parameter. */
473 static void sctp_v6_from_addr_param(union sctp_addr
*addr
,
474 union sctp_addr_param
*param
,
475 __be16 port
, int iif
)
477 addr
->v6
.sin6_family
= AF_INET6
;
478 addr
->v6
.sin6_port
= port
;
479 addr
->v6
.sin6_flowinfo
= 0; /* BUG */
480 ipv6_addr_copy(&addr
->v6
.sin6_addr
, ¶m
->v6
.addr
);
481 addr
->v6
.sin6_scope_id
= iif
;
484 /* Initialize an address parameter from a sctp_addr and return the length
485 * of the address parameter.
487 static int sctp_v6_to_addr_param(const union sctp_addr
*addr
,
488 union sctp_addr_param
*param
)
490 int length
= sizeof(sctp_ipv6addr_param_t
);
492 param
->v6
.param_hdr
.type
= SCTP_PARAM_IPV6_ADDRESS
;
493 param
->v6
.param_hdr
.length
= htons(length
);
494 ipv6_addr_copy(¶m
->v6
.addr
, &addr
->v6
.sin6_addr
);
499 /* Initialize a sctp_addr from struct in6_addr. */
500 static void sctp_v6_to_addr(union sctp_addr
*addr
, struct in6_addr
*saddr
,
503 addr
->sa
.sa_family
= AF_INET6
;
504 addr
->v6
.sin6_port
= port
;
505 ipv6_addr_copy(&addr
->v6
.sin6_addr
, saddr
);
508 /* Compare addresses exactly.
509 * v4-mapped-v6 is also in consideration.
511 static int sctp_v6_cmp_addr(const union sctp_addr
*addr1
,
512 const union sctp_addr
*addr2
)
514 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
) {
515 if (addr1
->sa
.sa_family
== AF_INET
&&
516 addr2
->sa
.sa_family
== AF_INET6
&&
517 ipv6_addr_v4mapped(&addr2
->v6
.sin6_addr
)) {
518 if (addr2
->v6
.sin6_port
== addr1
->v4
.sin_port
&&
519 addr2
->v6
.sin6_addr
.s6_addr32
[3] ==
520 addr1
->v4
.sin_addr
.s_addr
)
523 if (addr2
->sa
.sa_family
== AF_INET
&&
524 addr1
->sa
.sa_family
== AF_INET6
&&
525 ipv6_addr_v4mapped(&addr1
->v6
.sin6_addr
)) {
526 if (addr1
->v6
.sin6_port
== addr2
->v4
.sin_port
&&
527 addr1
->v6
.sin6_addr
.s6_addr32
[3] ==
528 addr2
->v4
.sin_addr
.s_addr
)
533 if (!ipv6_addr_equal(&addr1
->v6
.sin6_addr
, &addr2
->v6
.sin6_addr
))
535 /* If this is a linklocal address, compare the scope_id. */
536 if (ipv6_addr_type(&addr1
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
) {
537 if (addr1
->v6
.sin6_scope_id
&& addr2
->v6
.sin6_scope_id
&&
538 (addr1
->v6
.sin6_scope_id
!= addr2
->v6
.sin6_scope_id
)) {
546 /* Initialize addr struct to INADDR_ANY. */
547 static void sctp_v6_inaddr_any(union sctp_addr
*addr
, __be16 port
)
549 memset(addr
, 0x00, sizeof(union sctp_addr
));
550 addr
->v6
.sin6_family
= AF_INET6
;
551 addr
->v6
.sin6_port
= port
;
554 /* Is this a wildcard address? */
555 static int sctp_v6_is_any(const union sctp_addr
*addr
)
557 return ipv6_addr_any(&addr
->v6
.sin6_addr
);
560 /* Should this be available for binding? */
561 static int sctp_v6_available(union sctp_addr
*addr
, struct sctp_sock
*sp
)
564 const struct in6_addr
*in6
= (const struct in6_addr
*)&addr
->v6
.sin6_addr
;
566 type
= ipv6_addr_type(in6
);
567 if (IPV6_ADDR_ANY
== type
)
569 if (type
== IPV6_ADDR_MAPPED
) {
570 if (sp
&& !sp
->v4mapped
)
572 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
574 sctp_v6_map_v4(addr
);
575 return sctp_get_af_specific(AF_INET
)->available(addr
, sp
);
577 if (!(type
& IPV6_ADDR_UNICAST
))
580 return ipv6_chk_addr(&init_net
, in6
, NULL
, 0);
583 /* This function checks if the address is a valid address to be used for
587 * Return 0 - If the address is a non-unicast or an illegal address.
588 * Return 1 - If the address is a unicast.
590 static int sctp_v6_addr_valid(union sctp_addr
*addr
,
591 struct sctp_sock
*sp
,
592 const struct sk_buff
*skb
)
594 int ret
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
596 /* Support v4-mapped-v6 address. */
597 if (ret
== IPV6_ADDR_MAPPED
) {
598 /* Note: This routine is used in input, so v4-mapped-v6
599 * are disallowed here when there is no sctp_sock.
601 if (!sp
|| !sp
->v4mapped
)
603 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
605 sctp_v6_map_v4(addr
);
606 return sctp_get_af_specific(AF_INET
)->addr_valid(addr
, sp
, skb
);
609 /* Is this a non-unicast address */
610 if (!(ret
& IPV6_ADDR_UNICAST
))
616 /* What is the scope of 'addr'? */
617 static sctp_scope_t
sctp_v6_scope(union sctp_addr
*addr
)
622 /* The IPv6 scope is really a set of bit fields.
623 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
626 v6scope
= ipv6_addr_scope(&addr
->v6
.sin6_addr
);
629 retval
= SCTP_SCOPE_LOOPBACK
;
632 retval
= SCTP_SCOPE_LINK
;
635 retval
= SCTP_SCOPE_PRIVATE
;
638 retval
= SCTP_SCOPE_GLOBAL
;
645 /* Create and initialize a new sk for the socket to be returned by accept(). */
646 static struct sock
*sctp_v6_create_accept_sk(struct sock
*sk
,
647 struct sctp_association
*asoc
)
650 struct ipv6_pinfo
*newnp
, *np
= inet6_sk(sk
);
651 struct sctp6_sock
*newsctp6sk
;
653 newsk
= sk_alloc(sock_net(sk
), PF_INET6
, GFP_KERNEL
, sk
->sk_prot
);
657 sock_init_data(NULL
, newsk
);
659 sctp_copy_sock(newsk
, sk
, asoc
);
660 sock_reset_flag(sk
, SOCK_ZAPPED
);
662 newsctp6sk
= (struct sctp6_sock
*)newsk
;
663 inet_sk(newsk
)->pinet6
= &newsctp6sk
->inet6
;
665 sctp_sk(newsk
)->v4mapped
= sctp_sk(sk
)->v4mapped
;
667 newnp
= inet6_sk(newsk
);
669 memcpy(newnp
, np
, sizeof(struct ipv6_pinfo
));
671 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
674 sctp_v6_to_sk_daddr(&asoc
->peer
.primary_addr
, newsk
);
676 sk_refcnt_debug_inc(newsk
);
678 if (newsk
->sk_prot
->init(newsk
)) {
679 sk_common_release(newsk
);
687 /* Map v4 address to mapped v6 address */
688 static void sctp_v6_addr_v4map(struct sctp_sock
*sp
, union sctp_addr
*addr
)
690 if (sp
->v4mapped
&& AF_INET
== addr
->sa
.sa_family
)
691 sctp_v4_map_v6(addr
);
694 /* Where did this skb come from? */
695 static int sctp_v6_skb_iif(const struct sk_buff
*skb
)
697 struct inet6_skb_parm
*opt
= (struct inet6_skb_parm
*) skb
->cb
;
701 /* Was this packet marked by Explicit Congestion Notification? */
702 static int sctp_v6_is_ce(const struct sk_buff
*skb
)
704 return *((__u32
*)(ipv6_hdr(skb
))) & htonl(1 << 20);
707 /* Dump the v6 addr to the seq file. */
708 static void sctp_v6_seq_dump_addr(struct seq_file
*seq
, union sctp_addr
*addr
)
710 seq_printf(seq
, "%pI6 ", &addr
->v6
.sin6_addr
);
713 static void sctp_v6_ecn_capable(struct sock
*sk
)
715 inet6_sk(sk
)->tclass
|= INET_ECN_ECT_0
;
718 /* Initialize a PF_INET6 socket msg_name. */
719 static void sctp_inet6_msgname(char *msgname
, int *addr_len
)
721 struct sockaddr_in6
*sin6
;
723 sin6
= (struct sockaddr_in6
*)msgname
;
724 sin6
->sin6_family
= AF_INET6
;
725 sin6
->sin6_flowinfo
= 0;
726 sin6
->sin6_scope_id
= 0; /*FIXME */
727 *addr_len
= sizeof(struct sockaddr_in6
);
730 /* Initialize a PF_INET msgname from a ulpevent. */
731 static void sctp_inet6_event_msgname(struct sctp_ulpevent
*event
,
732 char *msgname
, int *addrlen
)
734 struct sockaddr_in6
*sin6
, *sin6from
;
737 union sctp_addr
*addr
;
738 struct sctp_association
*asoc
;
741 sctp_inet6_msgname(msgname
, addrlen
);
742 sin6
= (struct sockaddr_in6
*)msgname
;
743 sin6
->sin6_port
= htons(asoc
->peer
.port
);
744 addr
= &asoc
->peer
.primary_addr
;
746 /* Note: If we go to a common v6 format, this code
750 /* Map ipv4 address into v4-mapped-on-v6 address. */
751 if (sctp_sk(asoc
->base
.sk
)->v4mapped
&&
752 AF_INET
== addr
->sa
.sa_family
) {
753 sctp_v4_map_v6((union sctp_addr
*)sin6
);
754 sin6
->sin6_addr
.s6_addr32
[3] =
755 addr
->v4
.sin_addr
.s_addr
;
759 sin6from
= &asoc
->peer
.primary_addr
.v6
;
760 ipv6_addr_copy(&sin6
->sin6_addr
, &sin6from
->sin6_addr
);
761 if (ipv6_addr_type(&sin6
->sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
762 sin6
->sin6_scope_id
= sin6from
->sin6_scope_id
;
766 /* Initialize a msg_name from an inbound skb. */
767 static void sctp_inet6_skb_msgname(struct sk_buff
*skb
, char *msgname
,
771 struct sockaddr_in6
*sin6
;
774 sctp_inet6_msgname(msgname
, addr_len
);
775 sin6
= (struct sockaddr_in6
*)msgname
;
777 sin6
->sin6_port
= sh
->source
;
779 /* Map ipv4 address into v4-mapped-on-v6 address. */
780 if (sctp_sk(skb
->sk
)->v4mapped
&&
781 ip_hdr(skb
)->version
== 4) {
782 sctp_v4_map_v6((union sctp_addr
*)sin6
);
783 sin6
->sin6_addr
.s6_addr32
[3] = ip_hdr(skb
)->saddr
;
787 /* Otherwise, just copy the v6 address. */
788 ipv6_addr_copy(&sin6
->sin6_addr
, &ipv6_hdr(skb
)->saddr
);
789 if (ipv6_addr_type(&sin6
->sin6_addr
) & IPV6_ADDR_LINKLOCAL
) {
790 struct sctp_ulpevent
*ev
= sctp_skb2event(skb
);
791 sin6
->sin6_scope_id
= ev
->iif
;
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
) {
857 if (!addr
->v6
.sin6_scope_id
)
860 dev
= dev_get_by_index_rcu(&init_net
,
861 addr
->v6
.sin6_scope_id
);
863 !ipv6_chk_addr(&init_net
, &addr
->v6
.sin6_addr
,
869 } else if (type
== IPV6_ADDR_MAPPED
) {
876 return af
->available(addr
, opt
);
879 /* Verify that the provided sockaddr looks sendable. Common verification,
880 * has already been taken care of.
882 static int sctp_inet6_send_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
884 struct sctp_af
*af
= NULL
;
886 /* ASSERT: address family has already been verified. */
887 if (addr
->sa
.sa_family
!= AF_INET6
)
888 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
890 int type
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
891 struct net_device
*dev
;
893 if (type
& IPV6_ADDR_LINKLOCAL
) {
894 if (!addr
->v6
.sin6_scope_id
)
897 dev
= dev_get_by_index_rcu(&init_net
,
898 addr
->v6
.sin6_scope_id
);
909 /* Fill in Supported Address Type information for INIT and INIT-ACK
910 * chunks. Note: In the future, we may want to look at sock options
911 * to determine whether a PF_INET6 socket really wants to have IPV4
913 * Returns number of addresses supported.
915 static int sctp_inet6_supported_addrs(const struct sctp_sock
*opt
,
918 types
[0] = SCTP_PARAM_IPV6_ADDRESS
;
919 if (!opt
|| !ipv6_only_sock(sctp_opt2sk(opt
))) {
920 types
[1] = SCTP_PARAM_IPV4_ADDRESS
;
926 static const struct proto_ops inet6_seqpacket_ops
= {
928 .owner
= THIS_MODULE
,
929 .release
= inet6_release
,
931 .connect
= inet_dgram_connect
,
932 .socketpair
= sock_no_socketpair
,
933 .accept
= inet_accept
,
934 .getname
= inet6_getname
,
936 .ioctl
= inet6_ioctl
,
937 .listen
= sctp_inet_listen
,
938 .shutdown
= inet_shutdown
,
939 .setsockopt
= sock_common_setsockopt
,
940 .getsockopt
= sock_common_getsockopt
,
941 .sendmsg
= inet_sendmsg
,
942 .recvmsg
= sock_common_recvmsg
,
943 .mmap
= sock_no_mmap
,
945 .compat_setsockopt
= compat_sock_common_setsockopt
,
946 .compat_getsockopt
= compat_sock_common_getsockopt
,
950 static struct inet_protosw sctpv6_seqpacket_protosw
= {
951 .type
= SOCK_SEQPACKET
,
952 .protocol
= IPPROTO_SCTP
,
953 .prot
= &sctpv6_prot
,
954 .ops
= &inet6_seqpacket_ops
,
956 .flags
= SCTP_PROTOSW_FLAG
958 static struct inet_protosw sctpv6_stream_protosw
= {
960 .protocol
= IPPROTO_SCTP
,
961 .prot
= &sctpv6_prot
,
962 .ops
= &inet6_seqpacket_ops
,
964 .flags
= SCTP_PROTOSW_FLAG
,
967 static int sctp6_rcv(struct sk_buff
*skb
)
969 return sctp_rcv(skb
) ? -1 : 0;
972 static const struct inet6_protocol sctpv6_protocol
= {
973 .handler
= sctp6_rcv
,
974 .err_handler
= sctp_v6_err
,
975 .flags
= INET6_PROTO_NOPOLICY
| INET6_PROTO_FINAL
,
978 static struct sctp_af sctp_af_inet6
= {
979 .sa_family
= AF_INET6
,
980 .sctp_xmit
= sctp_v6_xmit
,
981 .setsockopt
= ipv6_setsockopt
,
982 .getsockopt
= ipv6_getsockopt
,
983 .get_dst
= sctp_v6_get_dst
,
984 .get_saddr
= sctp_v6_get_saddr
,
985 .copy_addrlist
= sctp_v6_copy_addrlist
,
986 .from_skb
= sctp_v6_from_skb
,
987 .from_sk
= sctp_v6_from_sk
,
988 .to_sk_saddr
= sctp_v6_to_sk_saddr
,
989 .to_sk_daddr
= sctp_v6_to_sk_daddr
,
990 .from_addr_param
= sctp_v6_from_addr_param
,
991 .to_addr_param
= sctp_v6_to_addr_param
,
992 .cmp_addr
= sctp_v6_cmp_addr
,
993 .scope
= sctp_v6_scope
,
994 .addr_valid
= sctp_v6_addr_valid
,
995 .inaddr_any
= sctp_v6_inaddr_any
,
996 .is_any
= sctp_v6_is_any
,
997 .available
= sctp_v6_available
,
998 .skb_iif
= sctp_v6_skb_iif
,
999 .is_ce
= sctp_v6_is_ce
,
1000 .seq_dump_addr
= sctp_v6_seq_dump_addr
,
1001 .ecn_capable
= sctp_v6_ecn_capable
,
1002 .net_header_len
= sizeof(struct ipv6hdr
),
1003 .sockaddr_len
= sizeof(struct sockaddr_in6
),
1004 #ifdef CONFIG_COMPAT
1005 .compat_setsockopt
= compat_ipv6_setsockopt
,
1006 .compat_getsockopt
= compat_ipv6_getsockopt
,
1010 static struct sctp_pf sctp_pf_inet6
= {
1011 .event_msgname
= sctp_inet6_event_msgname
,
1012 .skb_msgname
= sctp_inet6_skb_msgname
,
1013 .af_supported
= sctp_inet6_af_supported
,
1014 .cmp_addr
= sctp_inet6_cmp_addr
,
1015 .bind_verify
= sctp_inet6_bind_verify
,
1016 .send_verify
= sctp_inet6_send_verify
,
1017 .supported_addrs
= sctp_inet6_supported_addrs
,
1018 .create_accept_sk
= sctp_v6_create_accept_sk
,
1019 .addr_v4map
= sctp_v6_addr_v4map
,
1020 .af
= &sctp_af_inet6
,
1023 /* Initialize IPv6 support and register with socket layer. */
1024 void sctp_v6_pf_init(void)
1026 /* Register the SCTP specific PF_INET6 functions. */
1027 sctp_register_pf(&sctp_pf_inet6
, PF_INET6
);
1029 /* Register the SCTP specific AF_INET6 functions. */
1030 sctp_register_af(&sctp_af_inet6
);
1033 void sctp_v6_pf_exit(void)
1035 list_del(&sctp_af_inet6
.list
);
1038 /* Initialize IPv6 support and register with socket layer. */
1039 int sctp_v6_protosw_init(void)
1043 rc
= proto_register(&sctpv6_prot
, 1);
1047 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1048 inet6_register_protosw(&sctpv6_seqpacket_protosw
);
1049 inet6_register_protosw(&sctpv6_stream_protosw
);
1054 void sctp_v6_protosw_exit(void)
1056 inet6_unregister_protosw(&sctpv6_seqpacket_protosw
);
1057 inet6_unregister_protosw(&sctpv6_stream_protosw
);
1058 proto_unregister(&sctpv6_prot
);
1062 /* Register with inet6 layer. */
1063 int sctp_v6_add_protocol(void)
1065 /* Register notifier for inet6 address additions/deletions. */
1066 register_inet6addr_notifier(&sctp_inet6addr_notifier
);
1068 if (inet6_add_protocol(&sctpv6_protocol
, IPPROTO_SCTP
) < 0)
1074 /* Unregister with inet6 layer. */
1075 void sctp_v6_del_protocol(void)
1077 inet6_del_protocol(&sctpv6_protocol
, IPPROTO_SCTP
);
1078 unregister_inet6addr_notifier(&sctp_inet6addr_notifier
);