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>
57 #include <linux/in6.h>
58 #include <linux/netdevice.h>
59 #include <linux/init.h>
60 #include <linux/ipsec.h>
62 #include <linux/ipv6.h>
63 #include <linux/icmpv6.h>
64 #include <linux/random.h>
65 #include <linux/seq_file.h>
67 #include <net/protocol.h>
68 #include <net/ndisc.h>
71 #include <net/transp_v6.h>
72 #include <net/addrconf.h>
73 #include <net/ip6_route.h>
74 #include <net/inet_common.h>
75 #include <net/inet_ecn.h>
76 #include <net/sctp/sctp.h>
78 #include <asm/uaccess.h>
80 /* Event handler for inet6 address addition/deletion events.
81 * The sctp_local_addr_list needs to be protocted by a spin lock since
82 * multiple notifiers (say IPv4 and IPv6) may be running at the same
83 * time and thus corrupt the list.
84 * The reader side is protected with RCU.
86 static int sctp_inet6addr_event(struct notifier_block
*this, unsigned long ev
,
89 struct inet6_ifaddr
*ifa
= (struct inet6_ifaddr
*)ptr
;
90 struct sctp_sockaddr_entry
*addr
= NULL
;
91 struct sctp_sockaddr_entry
*temp
;
95 addr
= kmalloc(sizeof(struct sctp_sockaddr_entry
), GFP_ATOMIC
);
97 addr
->a
.v6
.sin6_family
= AF_INET6
;
98 addr
->a
.v6
.sin6_port
= 0;
99 memcpy(&addr
->a
.v6
.sin6_addr
, &ifa
->addr
,
100 sizeof(struct in6_addr
));
101 addr
->a
.v6
.sin6_scope_id
= ifa
->idev
->dev
->ifindex
;
103 spin_lock_bh(&sctp_local_addr_lock
);
104 list_add_tail_rcu(&addr
->list
, &sctp_local_addr_list
);
105 spin_unlock_bh(&sctp_local_addr_lock
);
109 spin_lock_bh(&sctp_local_addr_lock
);
110 list_for_each_entry_safe(addr
, temp
,
111 &sctp_local_addr_list
, list
) {
112 if (ipv6_addr_equal(&addr
->a
.v6
.sin6_addr
,
115 list_del_rcu(&addr
->list
);
119 spin_unlock_bh(&sctp_local_addr_lock
);
120 if (addr
&& !addr
->valid
)
121 call_rcu(&addr
->rcu
, sctp_local_addr_free
);
128 static struct notifier_block sctp_inet6addr_notifier
= {
129 .notifier_call
= sctp_inet6addr_event
,
132 /* ICMP error handler. */
133 SCTP_STATIC
void sctp_v6_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
134 int type
, int code
, int offset
, __be32 info
)
136 struct inet6_dev
*idev
;
138 struct sctp_association
*asoc
;
139 struct sctp_transport
*transport
;
140 struct ipv6_pinfo
*np
;
141 sk_buff_data_t saveip
, savesctp
;
144 idev
= in6_dev_get(skb
->dev
);
146 /* Fix up skb to look at the embedded net header. */
147 saveip
= skb
->network_header
;
148 savesctp
= skb
->transport_header
;
149 skb_reset_network_header(skb
);
150 skb_set_transport_header(skb
, offset
);
151 sk
= sctp_err_lookup(AF_INET6
, skb
, sctp_hdr(skb
), &asoc
, &transport
);
152 /* Put back, the original pointers. */
153 skb
->network_header
= saveip
;
154 skb
->transport_header
= savesctp
;
156 ICMP6_INC_STATS_BH(idev
, ICMP6_MIB_INERRORS
);
160 /* Warning: The sock lock is held. Remember to call
165 case ICMPV6_PKT_TOOBIG
:
166 sctp_icmp_frag_needed(sk
, asoc
, transport
, ntohl(info
));
168 case ICMPV6_PARAMPROB
:
169 if (ICMPV6_UNK_NEXTHDR
== code
) {
170 sctp_icmp_proto_unreachable(sk
, asoc
, transport
);
179 icmpv6_err_convert(type
, code
, &err
);
180 if (!sock_owned_by_user(sk
) && np
->recverr
) {
182 sk
->sk_error_report(sk
);
183 } else { /* Only an error on timeout */
184 sk
->sk_err_soft
= err
;
188 sctp_err_finish(sk
, asoc
);
190 if (likely(idev
!= NULL
))
194 /* Based on tcp_v6_xmit() in tcp_ipv6.c. */
195 static int sctp_v6_xmit(struct sk_buff
*skb
, struct sctp_transport
*transport
,
198 struct sock
*sk
= skb
->sk
;
199 struct ipv6_pinfo
*np
= inet6_sk(sk
);
202 memset(&fl
, 0, sizeof(fl
));
204 fl
.proto
= sk
->sk_protocol
;
206 /* Fill in the dest address from the route entry passed with the skb
207 * and the source address from the transport.
209 ipv6_addr_copy(&fl
.fl6_dst
, &transport
->ipaddr
.v6
.sin6_addr
);
210 ipv6_addr_copy(&fl
.fl6_src
, &transport
->saddr
.v6
.sin6_addr
);
212 fl
.fl6_flowlabel
= np
->flow_label
;
213 IP6_ECN_flow_xmit(sk
, fl
.fl6_flowlabel
);
214 if (ipv6_addr_type(&fl
.fl6_src
) & IPV6_ADDR_LINKLOCAL
)
215 fl
.oif
= transport
->saddr
.v6
.sin6_scope_id
;
217 fl
.oif
= sk
->sk_bound_dev_if
;
219 if (np
->opt
&& np
->opt
->srcrt
) {
220 struct rt0_hdr
*rt0
= (struct rt0_hdr
*) np
->opt
->srcrt
;
221 ipv6_addr_copy(&fl
.fl6_dst
, rt0
->addr
);
224 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
225 "src:" NIP6_FMT
" dst:" NIP6_FMT
"\n",
226 __FUNCTION__
, skb
, skb
->len
,
227 NIP6(fl
.fl6_src
), NIP6(fl
.fl6_dst
));
229 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS
);
231 return ip6_xmit(sk
, skb
, &fl
, np
->opt
, ipfragok
);
234 /* Returns the dst cache entry for the given source and destination ip
237 static struct dst_entry
*sctp_v6_get_dst(struct sctp_association
*asoc
,
238 union sctp_addr
*daddr
,
239 union sctp_addr
*saddr
)
241 struct dst_entry
*dst
;
244 memset(&fl
, 0, sizeof(fl
));
245 ipv6_addr_copy(&fl
.fl6_dst
, &daddr
->v6
.sin6_addr
);
246 if (ipv6_addr_type(&daddr
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
247 fl
.oif
= daddr
->v6
.sin6_scope_id
;
250 SCTP_DEBUG_PRINTK("%s: DST=" NIP6_FMT
" ",
251 __FUNCTION__
, NIP6(fl
.fl6_dst
));
254 ipv6_addr_copy(&fl
.fl6_src
, &saddr
->v6
.sin6_addr
);
256 "SRC=" NIP6_FMT
" - ",
260 dst
= ip6_route_output(NULL
, &fl
);
263 rt
= (struct rt6_info
*)dst
;
265 "rt6_dst:" NIP6_FMT
" rt6_src:" NIP6_FMT
"\n",
266 NIP6(rt
->rt6i_dst
.addr
), NIP6(rt
->rt6i_src
.addr
));
269 SCTP_DEBUG_PRINTK("NO ROUTE\n");
274 /* Returns the number of consecutive initial bits that match in the 2 ipv6
277 static inline int sctp_v6_addr_match_len(union sctp_addr
*s1
,
280 struct in6_addr
*a1
= &s1
->v6
.sin6_addr
;
281 struct in6_addr
*a2
= &s2
->v6
.sin6_addr
;
284 for (i
= 0; i
< 4 ; i
++) {
287 a1xora2
= a1
->s6_addr32
[i
] ^ a2
->s6_addr32
[i
];
289 if ((j
= fls(ntohl(a1xora2
))))
290 return (i
* 32 + 32 - j
);
296 /* Fills in the source address(saddr) based on the destination address(daddr)
297 * and asoc's bind address list.
299 static void sctp_v6_get_saddr(struct sctp_association
*asoc
,
300 struct dst_entry
*dst
,
301 union sctp_addr
*daddr
,
302 union sctp_addr
*saddr
)
304 struct sctp_bind_addr
*bp
;
306 struct sctp_sockaddr_entry
*laddr
;
307 struct list_head
*pos
;
309 union sctp_addr
*baddr
= NULL
;
313 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
314 "daddr:" NIP6_FMT
" ",
315 __FUNCTION__
, asoc
, dst
, NIP6(daddr
->v6
.sin6_addr
));
318 ipv6_get_saddr(dst
, &daddr
->v6
.sin6_addr
,&saddr
->v6
.sin6_addr
);
319 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT
"\n",
320 NIP6(saddr
->v6
.sin6_addr
));
324 scope
= sctp_scope(daddr
);
326 bp
= &asoc
->base
.bind_addr
;
327 addr_lock
= &asoc
->base
.addr_lock
;
329 /* Go through the bind address list and find the best source address
330 * that matches the scope of the destination address.
332 sctp_read_lock(addr_lock
);
333 list_for_each(pos
, &bp
->address_list
) {
334 laddr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
335 if ((laddr
->use_as_src
) &&
336 (laddr
->a
.sa
.sa_family
== AF_INET6
) &&
337 (scope
<= sctp_scope(&laddr
->a
))) {
338 bmatchlen
= sctp_v6_addr_match_len(daddr
, &laddr
->a
);
339 if (!baddr
|| (matchlen
< bmatchlen
)) {
341 matchlen
= bmatchlen
;
347 memcpy(saddr
, baddr
, sizeof(union sctp_addr
));
348 SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT
"\n",
349 NIP6(saddr
->v6
.sin6_addr
));
351 printk(KERN_ERR
"%s: asoc:%p Could not find a valid source "
352 "address for the dest:" NIP6_FMT
"\n",
353 __FUNCTION__
, asoc
, NIP6(daddr
->v6
.sin6_addr
));
356 sctp_read_unlock(addr_lock
);
359 /* Make a copy of all potential local addresses. */
360 static void sctp_v6_copy_addrlist(struct list_head
*addrlist
,
361 struct net_device
*dev
)
363 struct inet6_dev
*in6_dev
;
364 struct inet6_ifaddr
*ifp
;
365 struct sctp_sockaddr_entry
*addr
;
368 if ((in6_dev
= __in6_dev_get(dev
)) == NULL
) {
373 read_lock_bh(&in6_dev
->lock
);
374 for (ifp
= in6_dev
->addr_list
; ifp
; ifp
= ifp
->if_next
) {
375 /* Add the address to the local list. */
376 addr
= t_new(struct sctp_sockaddr_entry
, GFP_ATOMIC
);
378 addr
->a
.v6
.sin6_family
= AF_INET6
;
379 addr
->a
.v6
.sin6_port
= 0;
380 addr
->a
.v6
.sin6_addr
= ifp
->addr
;
381 addr
->a
.v6
.sin6_scope_id
= dev
->ifindex
;
383 INIT_LIST_HEAD(&addr
->list
);
384 INIT_RCU_HEAD(&addr
->rcu
);
385 list_add_tail(&addr
->list
, addrlist
);
389 read_unlock_bh(&in6_dev
->lock
);
393 /* Initialize a sockaddr_storage from in incoming skb. */
394 static void sctp_v6_from_skb(union sctp_addr
*addr
,struct sk_buff
*skb
,
401 port
= &addr
->v6
.sin6_port
;
402 addr
->v6
.sin6_family
= AF_INET6
;
403 addr
->v6
.sin6_flowinfo
= 0; /* FIXME */
404 addr
->v6
.sin6_scope_id
= ((struct inet6_skb_parm
*)skb
->cb
)->iif
;
409 from
= &ipv6_hdr(skb
)->saddr
;
412 from
= &ipv6_hdr(skb
)->daddr
;
414 ipv6_addr_copy(&addr
->v6
.sin6_addr
, from
);
417 /* Initialize an sctp_addr from a socket. */
418 static void sctp_v6_from_sk(union sctp_addr
*addr
, struct sock
*sk
)
420 addr
->v6
.sin6_family
= AF_INET6
;
421 addr
->v6
.sin6_port
= 0;
422 addr
->v6
.sin6_addr
= inet6_sk(sk
)->rcv_saddr
;
425 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
426 static void sctp_v6_to_sk_saddr(union sctp_addr
*addr
, struct sock
*sk
)
428 if (addr
->sa
.sa_family
== AF_INET
&& sctp_sk(sk
)->v4mapped
) {
429 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[0] = 0;
430 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[1] = 0;
431 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[2] = htonl(0x0000ffff);
432 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[3] =
433 addr
->v4
.sin_addr
.s_addr
;
435 inet6_sk(sk
)->rcv_saddr
= addr
->v6
.sin6_addr
;
439 /* Initialize sk->sk_daddr from sctp_addr. */
440 static void sctp_v6_to_sk_daddr(union sctp_addr
*addr
, struct sock
*sk
)
442 if (addr
->sa
.sa_family
== AF_INET
&& sctp_sk(sk
)->v4mapped
) {
443 inet6_sk(sk
)->daddr
.s6_addr32
[0] = 0;
444 inet6_sk(sk
)->daddr
.s6_addr32
[1] = 0;
445 inet6_sk(sk
)->daddr
.s6_addr32
[2] = htonl(0x0000ffff);
446 inet6_sk(sk
)->daddr
.s6_addr32
[3] = addr
->v4
.sin_addr
.s_addr
;
448 inet6_sk(sk
)->daddr
= addr
->v6
.sin6_addr
;
452 /* Initialize a sctp_addr from an address parameter. */
453 static void sctp_v6_from_addr_param(union sctp_addr
*addr
,
454 union sctp_addr_param
*param
,
455 __be16 port
, int iif
)
457 addr
->v6
.sin6_family
= AF_INET6
;
458 addr
->v6
.sin6_port
= port
;
459 addr
->v6
.sin6_flowinfo
= 0; /* BUG */
460 ipv6_addr_copy(&addr
->v6
.sin6_addr
, ¶m
->v6
.addr
);
461 addr
->v6
.sin6_scope_id
= iif
;
464 /* Initialize an address parameter from a sctp_addr and return the length
465 * of the address parameter.
467 static int sctp_v6_to_addr_param(const union sctp_addr
*addr
,
468 union sctp_addr_param
*param
)
470 int length
= sizeof(sctp_ipv6addr_param_t
);
472 param
->v6
.param_hdr
.type
= SCTP_PARAM_IPV6_ADDRESS
;
473 param
->v6
.param_hdr
.length
= htons(length
);
474 ipv6_addr_copy(¶m
->v6
.addr
, &addr
->v6
.sin6_addr
);
479 /* Initialize a sctp_addr from a dst_entry. */
480 static void sctp_v6_dst_saddr(union sctp_addr
*addr
, struct dst_entry
*dst
,
483 struct rt6_info
*rt
= (struct rt6_info
*)dst
;
484 addr
->sa
.sa_family
= AF_INET6
;
485 addr
->v6
.sin6_port
= port
;
486 ipv6_addr_copy(&addr
->v6
.sin6_addr
, &rt
->rt6i_src
.addr
);
489 /* Compare addresses exactly.
490 * v4-mapped-v6 is also in consideration.
492 static int sctp_v6_cmp_addr(const union sctp_addr
*addr1
,
493 const union sctp_addr
*addr2
)
495 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
) {
496 if (addr1
->sa
.sa_family
== AF_INET
&&
497 addr2
->sa
.sa_family
== AF_INET6
&&
498 IPV6_ADDR_MAPPED
== ipv6_addr_type(&addr2
->v6
.sin6_addr
)) {
499 if (addr2
->v6
.sin6_port
== addr1
->v4
.sin_port
&&
500 addr2
->v6
.sin6_addr
.s6_addr32
[3] ==
501 addr1
->v4
.sin_addr
.s_addr
)
504 if (addr2
->sa
.sa_family
== AF_INET
&&
505 addr1
->sa
.sa_family
== AF_INET6
&&
506 IPV6_ADDR_MAPPED
== ipv6_addr_type(&addr1
->v6
.sin6_addr
)) {
507 if (addr1
->v6
.sin6_port
== addr2
->v4
.sin_port
&&
508 addr1
->v6
.sin6_addr
.s6_addr32
[3] ==
509 addr2
->v4
.sin_addr
.s_addr
)
514 if (!ipv6_addr_equal(&addr1
->v6
.sin6_addr
, &addr2
->v6
.sin6_addr
))
516 /* If this is a linklocal address, compare the scope_id. */
517 if (ipv6_addr_type(&addr1
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
) {
518 if (addr1
->v6
.sin6_scope_id
&& addr2
->v6
.sin6_scope_id
&&
519 (addr1
->v6
.sin6_scope_id
!= addr2
->v6
.sin6_scope_id
)) {
527 /* Initialize addr struct to INADDR_ANY. */
528 static void sctp_v6_inaddr_any(union sctp_addr
*addr
, __be16 port
)
530 memset(addr
, 0x00, sizeof(union sctp_addr
));
531 addr
->v6
.sin6_family
= AF_INET6
;
532 addr
->v6
.sin6_port
= port
;
535 /* Is this a wildcard address? */
536 static int sctp_v6_is_any(const union sctp_addr
*addr
)
538 return ipv6_addr_any(&addr
->v6
.sin6_addr
);
541 /* Should this be available for binding? */
542 static int sctp_v6_available(union sctp_addr
*addr
, struct sctp_sock
*sp
)
545 struct in6_addr
*in6
= (struct in6_addr
*)&addr
->v6
.sin6_addr
;
547 type
= ipv6_addr_type(in6
);
548 if (IPV6_ADDR_ANY
== type
)
550 if (type
== IPV6_ADDR_MAPPED
) {
551 if (sp
&& !sp
->v4mapped
)
553 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
555 sctp_v6_map_v4(addr
);
556 return sctp_get_af_specific(AF_INET
)->available(addr
, sp
);
558 if (!(type
& IPV6_ADDR_UNICAST
))
561 return ipv6_chk_addr(in6
, NULL
, 0);
564 /* This function checks if the address is a valid address to be used for
568 * Return 0 - If the address is a non-unicast or an illegal address.
569 * Return 1 - If the address is a unicast.
571 static int sctp_v6_addr_valid(union sctp_addr
*addr
,
572 struct sctp_sock
*sp
,
573 const struct sk_buff
*skb
)
575 int ret
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
577 /* Support v4-mapped-v6 address. */
578 if (ret
== IPV6_ADDR_MAPPED
) {
579 /* Note: This routine is used in input, so v4-mapped-v6
580 * are disallowed here when there is no sctp_sock.
582 if (!sp
|| !sp
->v4mapped
)
584 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
586 sctp_v6_map_v4(addr
);
587 return sctp_get_af_specific(AF_INET
)->addr_valid(addr
, sp
, skb
);
590 /* Is this a non-unicast address */
591 if (!(ret
& IPV6_ADDR_UNICAST
))
597 /* What is the scope of 'addr'? */
598 static sctp_scope_t
sctp_v6_scope(union sctp_addr
*addr
)
603 /* The IPv6 scope is really a set of bit fields.
604 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
607 v6scope
= ipv6_addr_scope(&addr
->v6
.sin6_addr
);
610 retval
= SCTP_SCOPE_LOOPBACK
;
613 retval
= SCTP_SCOPE_LINK
;
616 retval
= SCTP_SCOPE_PRIVATE
;
619 retval
= SCTP_SCOPE_GLOBAL
;
626 /* Create and initialize a new sk for the socket to be returned by accept(). */
627 static struct sock
*sctp_v6_create_accept_sk(struct sock
*sk
,
628 struct sctp_association
*asoc
)
630 struct inet_sock
*inet
= inet_sk(sk
);
632 struct inet_sock
*newinet
;
633 struct ipv6_pinfo
*newnp
, *np
= inet6_sk(sk
);
634 struct sctp6_sock
*newsctp6sk
;
636 newsk
= sk_alloc(PF_INET6
, GFP_KERNEL
, sk
->sk_prot
, 1);
640 sock_init_data(NULL
, newsk
);
642 newsk
->sk_type
= SOCK_STREAM
;
644 newsk
->sk_prot
= sk
->sk_prot
;
645 newsk
->sk_no_check
= sk
->sk_no_check
;
646 newsk
->sk_reuse
= sk
->sk_reuse
;
648 newsk
->sk_destruct
= inet_sock_destruct
;
649 newsk
->sk_family
= PF_INET6
;
650 newsk
->sk_protocol
= IPPROTO_SCTP
;
651 newsk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
652 newsk
->sk_shutdown
= sk
->sk_shutdown
;
653 sock_reset_flag(sk
, SOCK_ZAPPED
);
655 newsctp6sk
= (struct sctp6_sock
*)newsk
;
656 inet_sk(newsk
)->pinet6
= &newsctp6sk
->inet6
;
658 sctp_sk(newsk
)->v4mapped
= sctp_sk(sk
)->v4mapped
;
660 newinet
= inet_sk(newsk
);
661 newnp
= inet6_sk(newsk
);
663 memcpy(newnp
, np
, sizeof(struct ipv6_pinfo
));
665 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
668 newinet
->sport
= inet
->sport
;
669 newnp
->saddr
= np
->saddr
;
670 newnp
->rcv_saddr
= np
->rcv_saddr
;
671 newinet
->dport
= htons(asoc
->peer
.port
);
672 sctp_v6_to_sk_daddr(&asoc
->peer
.primary_addr
, newsk
);
674 /* Init the ipv4 part of the socket since we can have sockets
675 * using v6 API for ipv4.
677 newinet
->uc_ttl
= -1;
678 newinet
->mc_loop
= 1;
680 newinet
->mc_index
= 0;
681 newinet
->mc_list
= NULL
;
683 if (ipv4_config
.no_pmtu_disc
)
684 newinet
->pmtudisc
= IP_PMTUDISC_DONT
;
686 newinet
->pmtudisc
= IP_PMTUDISC_WANT
;
688 sk_refcnt_debug_inc(newsk
);
690 if (newsk
->sk_prot
->init(newsk
)) {
691 sk_common_release(newsk
);
699 /* Map v4 address to mapped v6 address */
700 static void sctp_v6_addr_v4map(struct sctp_sock
*sp
, union sctp_addr
*addr
)
702 if (sp
->v4mapped
&& AF_INET
== addr
->sa
.sa_family
)
703 sctp_v4_map_v6(addr
);
706 /* Where did this skb come from? */
707 static int sctp_v6_skb_iif(const struct sk_buff
*skb
)
709 struct inet6_skb_parm
*opt
= (struct inet6_skb_parm
*) skb
->cb
;
713 /* Was this packet marked by Explicit Congestion Notification? */
714 static int sctp_v6_is_ce(const struct sk_buff
*skb
)
716 return *((__u32
*)(ipv6_hdr(skb
))) & htonl(1 << 20);
719 /* Dump the v6 addr to the seq file. */
720 static void sctp_v6_seq_dump_addr(struct seq_file
*seq
, union sctp_addr
*addr
)
722 seq_printf(seq
, NIP6_FMT
" ", NIP6(addr
->v6
.sin6_addr
));
725 /* Initialize a PF_INET6 socket msg_name. */
726 static void sctp_inet6_msgname(char *msgname
, int *addr_len
)
728 struct sockaddr_in6
*sin6
;
730 sin6
= (struct sockaddr_in6
*)msgname
;
731 sin6
->sin6_family
= AF_INET6
;
732 sin6
->sin6_flowinfo
= 0;
733 sin6
->sin6_scope_id
= 0; /*FIXME */
734 *addr_len
= sizeof(struct sockaddr_in6
);
737 /* Initialize a PF_INET msgname from a ulpevent. */
738 static void sctp_inet6_event_msgname(struct sctp_ulpevent
*event
,
739 char *msgname
, int *addrlen
)
741 struct sockaddr_in6
*sin6
, *sin6from
;
744 union sctp_addr
*addr
;
745 struct sctp_association
*asoc
;
748 sctp_inet6_msgname(msgname
, addrlen
);
749 sin6
= (struct sockaddr_in6
*)msgname
;
750 sin6
->sin6_port
= htons(asoc
->peer
.port
);
751 addr
= &asoc
->peer
.primary_addr
;
753 /* Note: If we go to a common v6 format, this code
757 /* Map ipv4 address into v4-mapped-on-v6 address. */
758 if (sctp_sk(asoc
->base
.sk
)->v4mapped
&&
759 AF_INET
== addr
->sa
.sa_family
) {
760 sctp_v4_map_v6((union sctp_addr
*)sin6
);
761 sin6
->sin6_addr
.s6_addr32
[3] =
762 addr
->v4
.sin_addr
.s_addr
;
766 sin6from
= &asoc
->peer
.primary_addr
.v6
;
767 ipv6_addr_copy(&sin6
->sin6_addr
, &sin6from
->sin6_addr
);
768 if (ipv6_addr_type(&sin6
->sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
769 sin6
->sin6_scope_id
= sin6from
->sin6_scope_id
;
773 /* Initialize a msg_name from an inbound skb. */
774 static void sctp_inet6_skb_msgname(struct sk_buff
*skb
, char *msgname
,
778 struct sockaddr_in6
*sin6
;
781 sctp_inet6_msgname(msgname
, addr_len
);
782 sin6
= (struct sockaddr_in6
*)msgname
;
784 sin6
->sin6_port
= sh
->source
;
786 /* Map ipv4 address into v4-mapped-on-v6 address. */
787 if (sctp_sk(skb
->sk
)->v4mapped
&&
788 ip_hdr(skb
)->version
== 4) {
789 sctp_v4_map_v6((union sctp_addr
*)sin6
);
790 sin6
->sin6_addr
.s6_addr32
[3] = ip_hdr(skb
)->saddr
;
794 /* Otherwise, just copy the v6 address. */
795 ipv6_addr_copy(&sin6
->sin6_addr
, &ipv6_hdr(skb
)->saddr
);
796 if (ipv6_addr_type(&sin6
->sin6_addr
) & IPV6_ADDR_LINKLOCAL
) {
797 struct sctp_ulpevent
*ev
= sctp_skb2event(skb
);
798 sin6
->sin6_scope_id
= ev
->iif
;
803 /* Do we support this AF? */
804 static int sctp_inet6_af_supported(sa_family_t family
, struct sctp_sock
*sp
)
809 /* v4-mapped-v6 addresses */
811 if (!__ipv6_only_sock(sctp_opt2sk(sp
)) && sp
->v4mapped
)
818 /* Address matching with wildcards allowed. This extra level
819 * of indirection lets us choose whether a PF_INET6 should
820 * disallow any v4 addresses if we so choose.
822 static int sctp_inet6_cmp_addr(const union sctp_addr
*addr1
,
823 const union sctp_addr
*addr2
,
824 struct sctp_sock
*opt
)
826 struct sctp_af
*af1
, *af2
;
828 af1
= sctp_get_af_specific(addr1
->sa
.sa_family
);
829 af2
= sctp_get_af_specific(addr2
->sa
.sa_family
);
833 /* Today, wildcard AF_INET/AF_INET6. */
834 if (sctp_is_any(addr1
) || sctp_is_any(addr2
))
837 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
)
840 return af1
->cmp_addr(addr1
, addr2
);
843 /* Verify that the provided sockaddr looks bindable. Common verification,
844 * has already been taken care of.
846 static int sctp_inet6_bind_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
850 /* ASSERT: address family has already been verified. */
851 if (addr
->sa
.sa_family
!= AF_INET6
)
852 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
854 int type
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
855 struct net_device
*dev
;
857 if (type
& IPV6_ADDR_LINKLOCAL
) {
858 if (!addr
->v6
.sin6_scope_id
)
860 dev
= dev_get_by_index(addr
->v6
.sin6_scope_id
);
863 if (!ipv6_chk_addr(&addr
->v6
.sin6_addr
, dev
, 0)) {
871 return af
->available(addr
, opt
);
874 /* Verify that the provided sockaddr looks sendable. Common verification,
875 * has already been taken care of.
877 static int sctp_inet6_send_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
879 struct sctp_af
*af
= NULL
;
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
) {
889 if (!addr
->v6
.sin6_scope_id
)
891 dev
= dev_get_by_index(addr
->v6
.sin6_scope_id
);
902 /* Fill in Supported Address Type information for INIT and INIT-ACK
903 * chunks. Note: In the future, we may want to look at sock options
904 * to determine whether a PF_INET6 socket really wants to have IPV4
906 * Returns number of addresses supported.
908 static int sctp_inet6_supported_addrs(const struct sctp_sock
*opt
,
911 types
[0] = SCTP_PARAM_IPV4_ADDRESS
;
912 types
[1] = SCTP_PARAM_IPV6_ADDRESS
;
916 static const struct proto_ops inet6_seqpacket_ops
= {
918 .owner
= THIS_MODULE
,
919 .release
= inet6_release
,
921 .connect
= inet_dgram_connect
,
922 .socketpair
= sock_no_socketpair
,
923 .accept
= inet_accept
,
924 .getname
= inet6_getname
,
926 .ioctl
= inet6_ioctl
,
927 .listen
= sctp_inet_listen
,
928 .shutdown
= inet_shutdown
,
929 .setsockopt
= sock_common_setsockopt
,
930 .getsockopt
= sock_common_getsockopt
,
931 .sendmsg
= inet_sendmsg
,
932 .recvmsg
= sock_common_recvmsg
,
933 .mmap
= sock_no_mmap
,
935 .compat_setsockopt
= compat_sock_common_setsockopt
,
936 .compat_getsockopt
= compat_sock_common_getsockopt
,
940 static struct inet_protosw sctpv6_seqpacket_protosw
= {
941 .type
= SOCK_SEQPACKET
,
942 .protocol
= IPPROTO_SCTP
,
943 .prot
= &sctpv6_prot
,
944 .ops
= &inet6_seqpacket_ops
,
947 .flags
= SCTP_PROTOSW_FLAG
949 static struct inet_protosw sctpv6_stream_protosw
= {
951 .protocol
= IPPROTO_SCTP
,
952 .prot
= &sctpv6_prot
,
953 .ops
= &inet6_seqpacket_ops
,
956 .flags
= SCTP_PROTOSW_FLAG
,
959 static int sctp6_rcv(struct sk_buff
**pskb
)
961 return sctp_rcv(*pskb
) ? -1 : 0;
964 static struct inet6_protocol sctpv6_protocol
= {
965 .handler
= sctp6_rcv
,
966 .err_handler
= sctp_v6_err
,
967 .flags
= INET6_PROTO_NOPOLICY
| INET6_PROTO_FINAL
,
970 static struct sctp_af sctp_ipv6_specific
= {
971 .sa_family
= AF_INET6
,
972 .sctp_xmit
= sctp_v6_xmit
,
973 .setsockopt
= ipv6_setsockopt
,
974 .getsockopt
= ipv6_getsockopt
,
975 .get_dst
= sctp_v6_get_dst
,
976 .get_saddr
= sctp_v6_get_saddr
,
977 .copy_addrlist
= sctp_v6_copy_addrlist
,
978 .from_skb
= sctp_v6_from_skb
,
979 .from_sk
= sctp_v6_from_sk
,
980 .to_sk_saddr
= sctp_v6_to_sk_saddr
,
981 .to_sk_daddr
= sctp_v6_to_sk_daddr
,
982 .from_addr_param
= sctp_v6_from_addr_param
,
983 .to_addr_param
= sctp_v6_to_addr_param
,
984 .dst_saddr
= sctp_v6_dst_saddr
,
985 .cmp_addr
= sctp_v6_cmp_addr
,
986 .scope
= sctp_v6_scope
,
987 .addr_valid
= sctp_v6_addr_valid
,
988 .inaddr_any
= sctp_v6_inaddr_any
,
989 .is_any
= sctp_v6_is_any
,
990 .available
= sctp_v6_available
,
991 .skb_iif
= sctp_v6_skb_iif
,
992 .is_ce
= sctp_v6_is_ce
,
993 .seq_dump_addr
= sctp_v6_seq_dump_addr
,
994 .net_header_len
= sizeof(struct ipv6hdr
),
995 .sockaddr_len
= sizeof(struct sockaddr_in6
),
997 .compat_setsockopt
= compat_ipv6_setsockopt
,
998 .compat_getsockopt
= compat_ipv6_getsockopt
,
1002 static struct sctp_pf sctp_pf_inet6_specific
= {
1003 .event_msgname
= sctp_inet6_event_msgname
,
1004 .skb_msgname
= sctp_inet6_skb_msgname
,
1005 .af_supported
= sctp_inet6_af_supported
,
1006 .cmp_addr
= sctp_inet6_cmp_addr
,
1007 .bind_verify
= sctp_inet6_bind_verify
,
1008 .send_verify
= sctp_inet6_send_verify
,
1009 .supported_addrs
= sctp_inet6_supported_addrs
,
1010 .create_accept_sk
= sctp_v6_create_accept_sk
,
1011 .addr_v4map
= sctp_v6_addr_v4map
,
1012 .af
= &sctp_ipv6_specific
,
1015 /* Initialize IPv6 support and register with socket layer. */
1016 int sctp_v6_init(void)
1020 /* Register the SCTP specific PF_INET6 functions. */
1021 sctp_register_pf(&sctp_pf_inet6_specific
, PF_INET6
);
1023 /* Register the SCTP specific AF_INET6 functions. */
1024 sctp_register_af(&sctp_ipv6_specific
);
1026 rc
= proto_register(&sctpv6_prot
, 1);
1030 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1031 inet6_register_protosw(&sctpv6_seqpacket_protosw
);
1032 inet6_register_protosw(&sctpv6_stream_protosw
);
1037 /* Register with inet6 layer. */
1038 int sctp_v6_add_protocol(void)
1040 /* Register notifier for inet6 address additions/deletions. */
1041 register_inet6addr_notifier(&sctp_inet6addr_notifier
);
1043 if (inet6_add_protocol(&sctpv6_protocol
, IPPROTO_SCTP
) < 0)
1049 /* IPv6 specific exit support. */
1050 void sctp_v6_exit(void)
1052 inet6_unregister_protosw(&sctpv6_seqpacket_protosw
);
1053 inet6_unregister_protosw(&sctpv6_stream_protosw
);
1054 proto_unregister(&sctpv6_prot
);
1055 list_del(&sctp_ipv6_specific
.list
);
1058 /* Unregister with inet6 layer. */
1059 void sctp_v6_del_protocol(void)
1061 inet6_del_protocol(&sctpv6_protocol
, IPPROTO_SCTP
);
1062 unregister_inet6addr_notifier(&sctp_inet6addr_notifier
);