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 #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
;
96 addr
= kmalloc(sizeof(struct sctp_sockaddr_entry
), GFP_ATOMIC
);
98 addr
->a
.v6
.sin6_family
= AF_INET6
;
99 addr
->a
.v6
.sin6_port
= 0;
100 memcpy(&addr
->a
.v6
.sin6_addr
, &ifa
->addr
,
101 sizeof(struct in6_addr
));
102 addr
->a
.v6
.sin6_scope_id
= ifa
->idev
->dev
->ifindex
;
104 spin_lock_bh(&sctp_local_addr_lock
);
105 list_add_tail_rcu(&addr
->list
, &sctp_local_addr_list
);
106 spin_unlock_bh(&sctp_local_addr_lock
);
110 spin_lock_bh(&sctp_local_addr_lock
);
111 list_for_each_entry_safe(addr
, temp
,
112 &sctp_local_addr_list
, list
) {
113 if (ipv6_addr_equal(&addr
->a
.v6
.sin6_addr
,
117 list_del_rcu(&addr
->list
);
121 spin_unlock_bh(&sctp_local_addr_lock
);
123 call_rcu(&addr
->rcu
, sctp_local_addr_free
);
130 static struct notifier_block sctp_inet6addr_notifier
= {
131 .notifier_call
= sctp_inet6addr_event
,
134 /* ICMP error handler. */
135 SCTP_STATIC
void sctp_v6_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
136 int type
, int code
, int offset
, __be32 info
)
138 struct inet6_dev
*idev
;
140 struct sctp_association
*asoc
;
141 struct sctp_transport
*transport
;
142 struct ipv6_pinfo
*np
;
143 sk_buff_data_t saveip
, savesctp
;
146 idev
= in6_dev_get(skb
->dev
);
148 /* Fix up skb to look at the embedded net header. */
149 saveip
= skb
->network_header
;
150 savesctp
= skb
->transport_header
;
151 skb_reset_network_header(skb
);
152 skb_set_transport_header(skb
, offset
);
153 sk
= sctp_err_lookup(AF_INET6
, skb
, sctp_hdr(skb
), &asoc
, &transport
);
154 /* Put back, the original pointers. */
155 skb
->network_header
= saveip
;
156 skb
->transport_header
= savesctp
;
158 ICMP6_INC_STATS_BH(idev
, ICMP6_MIB_INERRORS
);
162 /* Warning: The sock lock is held. Remember to call
167 case ICMPV6_PKT_TOOBIG
:
168 sctp_icmp_frag_needed(sk
, asoc
, transport
, ntohl(info
));
170 case ICMPV6_PARAMPROB
:
171 if (ICMPV6_UNK_NEXTHDR
== code
) {
172 sctp_icmp_proto_unreachable(sk
, asoc
, transport
);
181 icmpv6_err_convert(type
, code
, &err
);
182 if (!sock_owned_by_user(sk
) && np
->recverr
) {
184 sk
->sk_error_report(sk
);
185 } else { /* Only an error on timeout */
186 sk
->sk_err_soft
= err
;
190 sctp_err_finish(sk
, asoc
);
192 if (likely(idev
!= NULL
))
196 /* Based on tcp_v6_xmit() in tcp_ipv6.c. */
197 static int sctp_v6_xmit(struct sk_buff
*skb
, struct sctp_transport
*transport
,
200 struct sock
*sk
= skb
->sk
;
201 struct ipv6_pinfo
*np
= inet6_sk(sk
);
204 memset(&fl
, 0, sizeof(fl
));
206 fl
.proto
= sk
->sk_protocol
;
208 /* Fill in the dest address from the route entry passed with the skb
209 * and the source address from the transport.
211 ipv6_addr_copy(&fl
.fl6_dst
, &transport
->ipaddr
.v6
.sin6_addr
);
212 ipv6_addr_copy(&fl
.fl6_src
, &transport
->saddr
.v6
.sin6_addr
);
214 fl
.fl6_flowlabel
= np
->flow_label
;
215 IP6_ECN_flow_xmit(sk
, fl
.fl6_flowlabel
);
216 if (ipv6_addr_type(&fl
.fl6_src
) & IPV6_ADDR_LINKLOCAL
)
217 fl
.oif
= transport
->saddr
.v6
.sin6_scope_id
;
219 fl
.oif
= sk
->sk_bound_dev_if
;
221 if (np
->opt
&& np
->opt
->srcrt
) {
222 struct rt0_hdr
*rt0
= (struct rt0_hdr
*) np
->opt
->srcrt
;
223 ipv6_addr_copy(&fl
.fl6_dst
, rt0
->addr
);
226 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
227 "src:" NIP6_FMT
" dst:" NIP6_FMT
"\n",
228 __func__
, skb
, skb
->len
,
229 NIP6(fl
.fl6_src
), NIP6(fl
.fl6_dst
));
231 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS
);
233 return ip6_xmit(sk
, skb
, &fl
, np
->opt
, ipfragok
);
236 /* Returns the dst cache entry for the given source and destination ip
239 static struct dst_entry
*sctp_v6_get_dst(struct sctp_association
*asoc
,
240 union sctp_addr
*daddr
,
241 union sctp_addr
*saddr
)
243 struct dst_entry
*dst
;
246 memset(&fl
, 0, sizeof(fl
));
247 ipv6_addr_copy(&fl
.fl6_dst
, &daddr
->v6
.sin6_addr
);
248 if (ipv6_addr_type(&daddr
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
249 fl
.oif
= daddr
->v6
.sin6_scope_id
;
252 SCTP_DEBUG_PRINTK("%s: DST=" NIP6_FMT
" ",
253 __func__
, NIP6(fl
.fl6_dst
));
256 ipv6_addr_copy(&fl
.fl6_src
, &saddr
->v6
.sin6_addr
);
258 "SRC=" NIP6_FMT
" - ",
262 dst
= ip6_route_output(&init_net
, NULL
, &fl
);
265 rt
= (struct rt6_info
*)dst
;
267 "rt6_dst:" NIP6_FMT
" rt6_src:" NIP6_FMT
"\n",
268 NIP6(rt
->rt6i_dst
.addr
), NIP6(rt
->rt6i_src
.addr
));
271 SCTP_DEBUG_PRINTK("NO ROUTE\n");
276 /* Returns the number of consecutive initial bits that match in the 2 ipv6
279 static inline int sctp_v6_addr_match_len(union sctp_addr
*s1
,
282 struct in6_addr
*a1
= &s1
->v6
.sin6_addr
;
283 struct in6_addr
*a2
= &s2
->v6
.sin6_addr
;
286 for (i
= 0; i
< 4 ; i
++) {
289 a1xora2
= a1
->s6_addr32
[i
] ^ a2
->s6_addr32
[i
];
291 if ((j
= fls(ntohl(a1xora2
))))
292 return (i
* 32 + 32 - j
);
298 /* Fills in the source address(saddr) based on the destination address(daddr)
299 * and asoc's bind address list.
301 static void sctp_v6_get_saddr(struct sctp_association
*asoc
,
302 struct dst_entry
*dst
,
303 union sctp_addr
*daddr
,
304 union sctp_addr
*saddr
)
306 struct sctp_bind_addr
*bp
;
307 struct sctp_sockaddr_entry
*laddr
;
309 union sctp_addr
*baddr
= NULL
;
313 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
314 "daddr:" NIP6_FMT
" ",
315 __func__
, asoc
, dst
, NIP6(daddr
->v6
.sin6_addr
));
318 ipv6_dev_get_saddr(dst
? ip6_dst_idev(dst
)->dev
: NULL
,
319 &daddr
->v6
.sin6_addr
,
320 inet6_sk(asoc
->base
.sk
)->srcprefs
,
321 &saddr
->v6
.sin6_addr
);
322 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT
"\n",
323 NIP6(saddr
->v6
.sin6_addr
));
327 scope
= sctp_scope(daddr
);
329 bp
= &asoc
->base
.bind_addr
;
331 /* Go through the bind address list and find the best source address
332 * that matches the scope of the destination address.
335 list_for_each_entry_rcu(laddr
, &bp
->address_list
, list
) {
338 if ((laddr
->state
== SCTP_ADDR_SRC
) &&
339 (laddr
->a
.sa
.sa_family
== AF_INET6
) &&
340 (scope
<= sctp_scope(&laddr
->a
))) {
341 bmatchlen
= sctp_v6_addr_match_len(daddr
, &laddr
->a
);
342 if (!baddr
|| (matchlen
< bmatchlen
)) {
344 matchlen
= bmatchlen
;
350 memcpy(saddr
, baddr
, sizeof(union sctp_addr
));
351 SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT
"\n",
352 NIP6(saddr
->v6
.sin6_addr
));
354 printk(KERN_ERR
"%s: asoc:%p Could not find a valid source "
355 "address for the dest:" NIP6_FMT
"\n",
356 __func__
, asoc
, NIP6(daddr
->v6
.sin6_addr
));
362 /* Make a copy of all potential local addresses. */
363 static void sctp_v6_copy_addrlist(struct list_head
*addrlist
,
364 struct net_device
*dev
)
366 struct inet6_dev
*in6_dev
;
367 struct inet6_ifaddr
*ifp
;
368 struct sctp_sockaddr_entry
*addr
;
371 if ((in6_dev
= __in6_dev_get(dev
)) == NULL
) {
376 read_lock_bh(&in6_dev
->lock
);
377 for (ifp
= in6_dev
->addr_list
; ifp
; ifp
= ifp
->if_next
) {
378 /* Add the address to the local list. */
379 addr
= t_new(struct sctp_sockaddr_entry
, GFP_ATOMIC
);
381 addr
->a
.v6
.sin6_family
= AF_INET6
;
382 addr
->a
.v6
.sin6_port
= 0;
383 addr
->a
.v6
.sin6_addr
= ifp
->addr
;
384 addr
->a
.v6
.sin6_scope_id
= dev
->ifindex
;
386 INIT_LIST_HEAD(&addr
->list
);
387 INIT_RCU_HEAD(&addr
->rcu
);
388 list_add_tail(&addr
->list
, addrlist
);
392 read_unlock_bh(&in6_dev
->lock
);
396 /* Initialize a sockaddr_storage from in incoming skb. */
397 static void sctp_v6_from_skb(union sctp_addr
*addr
,struct sk_buff
*skb
,
404 port
= &addr
->v6
.sin6_port
;
405 addr
->v6
.sin6_family
= AF_INET6
;
406 addr
->v6
.sin6_flowinfo
= 0; /* FIXME */
407 addr
->v6
.sin6_scope_id
= ((struct inet6_skb_parm
*)skb
->cb
)->iif
;
412 from
= &ipv6_hdr(skb
)->saddr
;
415 from
= &ipv6_hdr(skb
)->daddr
;
417 ipv6_addr_copy(&addr
->v6
.sin6_addr
, from
);
420 /* Initialize an sctp_addr from a socket. */
421 static void sctp_v6_from_sk(union sctp_addr
*addr
, struct sock
*sk
)
423 addr
->v6
.sin6_family
= AF_INET6
;
424 addr
->v6
.sin6_port
= 0;
425 addr
->v6
.sin6_addr
= inet6_sk(sk
)->rcv_saddr
;
428 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
429 static void sctp_v6_to_sk_saddr(union sctp_addr
*addr
, struct sock
*sk
)
431 if (addr
->sa
.sa_family
== AF_INET
&& sctp_sk(sk
)->v4mapped
) {
432 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[0] = 0;
433 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[1] = 0;
434 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[2] = htonl(0x0000ffff);
435 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[3] =
436 addr
->v4
.sin_addr
.s_addr
;
438 inet6_sk(sk
)->rcv_saddr
= addr
->v6
.sin6_addr
;
442 /* Initialize sk->sk_daddr from sctp_addr. */
443 static void sctp_v6_to_sk_daddr(union sctp_addr
*addr
, struct sock
*sk
)
445 if (addr
->sa
.sa_family
== AF_INET
&& sctp_sk(sk
)->v4mapped
) {
446 inet6_sk(sk
)->daddr
.s6_addr32
[0] = 0;
447 inet6_sk(sk
)->daddr
.s6_addr32
[1] = 0;
448 inet6_sk(sk
)->daddr
.s6_addr32
[2] = htonl(0x0000ffff);
449 inet6_sk(sk
)->daddr
.s6_addr32
[3] = addr
->v4
.sin_addr
.s_addr
;
451 inet6_sk(sk
)->daddr
= addr
->v6
.sin6_addr
;
455 /* Initialize a sctp_addr from an address parameter. */
456 static void sctp_v6_from_addr_param(union sctp_addr
*addr
,
457 union sctp_addr_param
*param
,
458 __be16 port
, int iif
)
460 addr
->v6
.sin6_family
= AF_INET6
;
461 addr
->v6
.sin6_port
= port
;
462 addr
->v6
.sin6_flowinfo
= 0; /* BUG */
463 ipv6_addr_copy(&addr
->v6
.sin6_addr
, ¶m
->v6
.addr
);
464 addr
->v6
.sin6_scope_id
= iif
;
467 /* Initialize an address parameter from a sctp_addr and return the length
468 * of the address parameter.
470 static int sctp_v6_to_addr_param(const union sctp_addr
*addr
,
471 union sctp_addr_param
*param
)
473 int length
= sizeof(sctp_ipv6addr_param_t
);
475 param
->v6
.param_hdr
.type
= SCTP_PARAM_IPV6_ADDRESS
;
476 param
->v6
.param_hdr
.length
= htons(length
);
477 ipv6_addr_copy(¶m
->v6
.addr
, &addr
->v6
.sin6_addr
);
482 /* Initialize a sctp_addr from a dst_entry. */
483 static void sctp_v6_dst_saddr(union sctp_addr
*addr
, struct dst_entry
*dst
,
486 struct rt6_info
*rt
= (struct rt6_info
*)dst
;
487 addr
->sa
.sa_family
= AF_INET6
;
488 addr
->v6
.sin6_port
= port
;
489 ipv6_addr_copy(&addr
->v6
.sin6_addr
, &rt
->rt6i_src
.addr
);
492 /* Compare addresses exactly.
493 * v4-mapped-v6 is also in consideration.
495 static int sctp_v6_cmp_addr(const union sctp_addr
*addr1
,
496 const union sctp_addr
*addr2
)
498 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
) {
499 if (addr1
->sa
.sa_family
== AF_INET
&&
500 addr2
->sa
.sa_family
== AF_INET6
&&
501 ipv6_addr_v4mapped(&addr2
->v6
.sin6_addr
)) {
502 if (addr2
->v6
.sin6_port
== addr1
->v4
.sin_port
&&
503 addr2
->v6
.sin6_addr
.s6_addr32
[3] ==
504 addr1
->v4
.sin_addr
.s_addr
)
507 if (addr2
->sa
.sa_family
== AF_INET
&&
508 addr1
->sa
.sa_family
== AF_INET6
&&
509 ipv6_addr_v4mapped(&addr1
->v6
.sin6_addr
)) {
510 if (addr1
->v6
.sin6_port
== addr2
->v4
.sin_port
&&
511 addr1
->v6
.sin6_addr
.s6_addr32
[3] ==
512 addr2
->v4
.sin_addr
.s_addr
)
517 if (!ipv6_addr_equal(&addr1
->v6
.sin6_addr
, &addr2
->v6
.sin6_addr
))
519 /* If this is a linklocal address, compare the scope_id. */
520 if (ipv6_addr_type(&addr1
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
) {
521 if (addr1
->v6
.sin6_scope_id
&& addr2
->v6
.sin6_scope_id
&&
522 (addr1
->v6
.sin6_scope_id
!= addr2
->v6
.sin6_scope_id
)) {
530 /* Initialize addr struct to INADDR_ANY. */
531 static void sctp_v6_inaddr_any(union sctp_addr
*addr
, __be16 port
)
533 memset(addr
, 0x00, sizeof(union sctp_addr
));
534 addr
->v6
.sin6_family
= AF_INET6
;
535 addr
->v6
.sin6_port
= port
;
538 /* Is this a wildcard address? */
539 static int sctp_v6_is_any(const union sctp_addr
*addr
)
541 return ipv6_addr_any(&addr
->v6
.sin6_addr
);
544 /* Should this be available for binding? */
545 static int sctp_v6_available(union sctp_addr
*addr
, struct sctp_sock
*sp
)
548 struct in6_addr
*in6
= (struct in6_addr
*)&addr
->v6
.sin6_addr
;
550 type
= ipv6_addr_type(in6
);
551 if (IPV6_ADDR_ANY
== type
)
553 if (type
== IPV6_ADDR_MAPPED
) {
554 if (sp
&& !sp
->v4mapped
)
556 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
558 sctp_v6_map_v4(addr
);
559 return sctp_get_af_specific(AF_INET
)->available(addr
, sp
);
561 if (!(type
& IPV6_ADDR_UNICAST
))
564 return ipv6_chk_addr(&init_net
, in6
, NULL
, 0);
567 /* This function checks if the address is a valid address to be used for
571 * Return 0 - If the address is a non-unicast or an illegal address.
572 * Return 1 - If the address is a unicast.
574 static int sctp_v6_addr_valid(union sctp_addr
*addr
,
575 struct sctp_sock
*sp
,
576 const struct sk_buff
*skb
)
578 int ret
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
580 /* Support v4-mapped-v6 address. */
581 if (ret
== IPV6_ADDR_MAPPED
) {
582 /* Note: This routine is used in input, so v4-mapped-v6
583 * are disallowed here when there is no sctp_sock.
585 if (!sp
|| !sp
->v4mapped
)
587 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
589 sctp_v6_map_v4(addr
);
590 return sctp_get_af_specific(AF_INET
)->addr_valid(addr
, sp
, skb
);
593 /* Is this a non-unicast address */
594 if (!(ret
& IPV6_ADDR_UNICAST
))
600 /* What is the scope of 'addr'? */
601 static sctp_scope_t
sctp_v6_scope(union sctp_addr
*addr
)
606 /* The IPv6 scope is really a set of bit fields.
607 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
610 v6scope
= ipv6_addr_scope(&addr
->v6
.sin6_addr
);
613 retval
= SCTP_SCOPE_LOOPBACK
;
616 retval
= SCTP_SCOPE_LINK
;
619 retval
= SCTP_SCOPE_PRIVATE
;
622 retval
= SCTP_SCOPE_GLOBAL
;
629 /* Create and initialize a new sk for the socket to be returned by accept(). */
630 static struct sock
*sctp_v6_create_accept_sk(struct sock
*sk
,
631 struct sctp_association
*asoc
)
633 struct inet_sock
*inet
= inet_sk(sk
);
635 struct inet_sock
*newinet
;
636 struct ipv6_pinfo
*newnp
, *np
= inet6_sk(sk
);
637 struct sctp6_sock
*newsctp6sk
;
639 newsk
= sk_alloc(sock_net(sk
), PF_INET6
, GFP_KERNEL
, sk
->sk_prot
);
643 sock_init_data(NULL
, newsk
);
645 newsk
->sk_type
= SOCK_STREAM
;
647 newsk
->sk_prot
= sk
->sk_prot
;
648 newsk
->sk_no_check
= sk
->sk_no_check
;
649 newsk
->sk_reuse
= sk
->sk_reuse
;
651 newsk
->sk_destruct
= inet_sock_destruct
;
652 newsk
->sk_family
= PF_INET6
;
653 newsk
->sk_protocol
= IPPROTO_SCTP
;
654 newsk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
655 newsk
->sk_shutdown
= sk
->sk_shutdown
;
656 sock_reset_flag(sk
, SOCK_ZAPPED
);
658 newsctp6sk
= (struct sctp6_sock
*)newsk
;
659 inet_sk(newsk
)->pinet6
= &newsctp6sk
->inet6
;
661 sctp_sk(newsk
)->v4mapped
= sctp_sk(sk
)->v4mapped
;
663 newinet
= inet_sk(newsk
);
664 newnp
= inet6_sk(newsk
);
666 memcpy(newnp
, np
, sizeof(struct ipv6_pinfo
));
668 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
671 newinet
->sport
= inet
->sport
;
672 newnp
->saddr
= np
->saddr
;
673 newnp
->rcv_saddr
= np
->rcv_saddr
;
674 newinet
->dport
= htons(asoc
->peer
.port
);
675 sctp_v6_to_sk_daddr(&asoc
->peer
.primary_addr
, newsk
);
677 /* Init the ipv4 part of the socket since we can have sockets
678 * using v6 API for ipv4.
680 newinet
->uc_ttl
= -1;
681 newinet
->mc_loop
= 1;
683 newinet
->mc_index
= 0;
684 newinet
->mc_list
= NULL
;
686 if (ipv4_config
.no_pmtu_disc
)
687 newinet
->pmtudisc
= IP_PMTUDISC_DONT
;
689 newinet
->pmtudisc
= IP_PMTUDISC_WANT
;
691 sk_refcnt_debug_inc(newsk
);
693 if (newsk
->sk_prot
->init(newsk
)) {
694 sk_common_release(newsk
);
702 /* Map v4 address to mapped v6 address */
703 static void sctp_v6_addr_v4map(struct sctp_sock
*sp
, union sctp_addr
*addr
)
705 if (sp
->v4mapped
&& AF_INET
== addr
->sa
.sa_family
)
706 sctp_v4_map_v6(addr
);
709 /* Where did this skb come from? */
710 static int sctp_v6_skb_iif(const struct sk_buff
*skb
)
712 struct inet6_skb_parm
*opt
= (struct inet6_skb_parm
*) skb
->cb
;
716 /* Was this packet marked by Explicit Congestion Notification? */
717 static int sctp_v6_is_ce(const struct sk_buff
*skb
)
719 return *((__u32
*)(ipv6_hdr(skb
))) & htonl(1 << 20);
722 /* Dump the v6 addr to the seq file. */
723 static void sctp_v6_seq_dump_addr(struct seq_file
*seq
, union sctp_addr
*addr
)
725 seq_printf(seq
, NIP6_FMT
" ", NIP6(addr
->v6
.sin6_addr
));
728 /* Initialize a PF_INET6 socket msg_name. */
729 static void sctp_inet6_msgname(char *msgname
, int *addr_len
)
731 struct sockaddr_in6
*sin6
;
733 sin6
= (struct sockaddr_in6
*)msgname
;
734 sin6
->sin6_family
= AF_INET6
;
735 sin6
->sin6_flowinfo
= 0;
736 sin6
->sin6_scope_id
= 0; /*FIXME */
737 *addr_len
= sizeof(struct sockaddr_in6
);
740 /* Initialize a PF_INET msgname from a ulpevent. */
741 static void sctp_inet6_event_msgname(struct sctp_ulpevent
*event
,
742 char *msgname
, int *addrlen
)
744 struct sockaddr_in6
*sin6
, *sin6from
;
747 union sctp_addr
*addr
;
748 struct sctp_association
*asoc
;
751 sctp_inet6_msgname(msgname
, addrlen
);
752 sin6
= (struct sockaddr_in6
*)msgname
;
753 sin6
->sin6_port
= htons(asoc
->peer
.port
);
754 addr
= &asoc
->peer
.primary_addr
;
756 /* Note: If we go to a common v6 format, this code
760 /* Map ipv4 address into v4-mapped-on-v6 address. */
761 if (sctp_sk(asoc
->base
.sk
)->v4mapped
&&
762 AF_INET
== addr
->sa
.sa_family
) {
763 sctp_v4_map_v6((union sctp_addr
*)sin6
);
764 sin6
->sin6_addr
.s6_addr32
[3] =
765 addr
->v4
.sin_addr
.s_addr
;
769 sin6from
= &asoc
->peer
.primary_addr
.v6
;
770 ipv6_addr_copy(&sin6
->sin6_addr
, &sin6from
->sin6_addr
);
771 if (ipv6_addr_type(&sin6
->sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
772 sin6
->sin6_scope_id
= sin6from
->sin6_scope_id
;
776 /* Initialize a msg_name from an inbound skb. */
777 static void sctp_inet6_skb_msgname(struct sk_buff
*skb
, char *msgname
,
781 struct sockaddr_in6
*sin6
;
784 sctp_inet6_msgname(msgname
, addr_len
);
785 sin6
= (struct sockaddr_in6
*)msgname
;
787 sin6
->sin6_port
= sh
->source
;
789 /* Map ipv4 address into v4-mapped-on-v6 address. */
790 if (sctp_sk(skb
->sk
)->v4mapped
&&
791 ip_hdr(skb
)->version
== 4) {
792 sctp_v4_map_v6((union sctp_addr
*)sin6
);
793 sin6
->sin6_addr
.s6_addr32
[3] = ip_hdr(skb
)->saddr
;
797 /* Otherwise, just copy the v6 address. */
798 ipv6_addr_copy(&sin6
->sin6_addr
, &ipv6_hdr(skb
)->saddr
);
799 if (ipv6_addr_type(&sin6
->sin6_addr
) & IPV6_ADDR_LINKLOCAL
) {
800 struct sctp_ulpevent
*ev
= sctp_skb2event(skb
);
801 sin6
->sin6_scope_id
= ev
->iif
;
806 /* Do we support this AF? */
807 static int sctp_inet6_af_supported(sa_family_t family
, struct sctp_sock
*sp
)
812 /* v4-mapped-v6 addresses */
814 if (!__ipv6_only_sock(sctp_opt2sk(sp
)) && sp
->v4mapped
)
821 /* Address matching with wildcards allowed. This extra level
822 * of indirection lets us choose whether a PF_INET6 should
823 * disallow any v4 addresses if we so choose.
825 static int sctp_inet6_cmp_addr(const union sctp_addr
*addr1
,
826 const union sctp_addr
*addr2
,
827 struct sctp_sock
*opt
)
829 struct sctp_af
*af1
, *af2
;
831 af1
= sctp_get_af_specific(addr1
->sa
.sa_family
);
832 af2
= sctp_get_af_specific(addr2
->sa
.sa_family
);
836 /* Today, wildcard AF_INET/AF_INET6. */
837 if (sctp_is_any(addr1
) || sctp_is_any(addr2
))
840 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
)
843 return af1
->cmp_addr(addr1
, addr2
);
846 /* Verify that the provided sockaddr looks bindable. Common verification,
847 * has already been taken care of.
849 static int sctp_inet6_bind_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
853 /* ASSERT: address family has already been verified. */
854 if (addr
->sa
.sa_family
!= AF_INET6
)
855 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
857 int type
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
858 struct net_device
*dev
;
860 if (type
& IPV6_ADDR_LINKLOCAL
) {
861 if (!addr
->v6
.sin6_scope_id
)
863 dev
= dev_get_by_index(&init_net
, addr
->v6
.sin6_scope_id
);
866 if (!ipv6_chk_addr(&init_net
, &addr
->v6
.sin6_addr
,
875 return af
->available(addr
, opt
);
878 /* Verify that the provided sockaddr looks sendable. Common verification,
879 * has already been taken care of.
881 static int sctp_inet6_send_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
883 struct sctp_af
*af
= NULL
;
885 /* ASSERT: address family has already been verified. */
886 if (addr
->sa
.sa_family
!= AF_INET6
)
887 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
889 int type
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
890 struct net_device
*dev
;
892 if (type
& IPV6_ADDR_LINKLOCAL
) {
893 if (!addr
->v6
.sin6_scope_id
)
895 dev
= dev_get_by_index(&init_net
, addr
->v6
.sin6_scope_id
);
906 /* Fill in Supported Address Type information for INIT and INIT-ACK
907 * chunks. Note: In the future, we may want to look at sock options
908 * to determine whether a PF_INET6 socket really wants to have IPV4
910 * Returns number of addresses supported.
912 static int sctp_inet6_supported_addrs(const struct sctp_sock
*opt
,
915 types
[0] = SCTP_PARAM_IPV4_ADDRESS
;
916 types
[1] = SCTP_PARAM_IPV6_ADDRESS
;
920 static const struct proto_ops inet6_seqpacket_ops
= {
922 .owner
= THIS_MODULE
,
923 .release
= inet6_release
,
925 .connect
= inet_dgram_connect
,
926 .socketpair
= sock_no_socketpair
,
927 .accept
= inet_accept
,
928 .getname
= inet6_getname
,
930 .ioctl
= inet6_ioctl
,
931 .listen
= sctp_inet_listen
,
932 .shutdown
= inet_shutdown
,
933 .setsockopt
= sock_common_setsockopt
,
934 .getsockopt
= sock_common_getsockopt
,
935 .sendmsg
= inet_sendmsg
,
936 .recvmsg
= sock_common_recvmsg
,
937 .mmap
= sock_no_mmap
,
939 .compat_setsockopt
= compat_sock_common_setsockopt
,
940 .compat_getsockopt
= compat_sock_common_getsockopt
,
944 static struct inet_protosw sctpv6_seqpacket_protosw
= {
945 .type
= SOCK_SEQPACKET
,
946 .protocol
= IPPROTO_SCTP
,
947 .prot
= &sctpv6_prot
,
948 .ops
= &inet6_seqpacket_ops
,
951 .flags
= SCTP_PROTOSW_FLAG
953 static struct inet_protosw sctpv6_stream_protosw
= {
955 .protocol
= IPPROTO_SCTP
,
956 .prot
= &sctpv6_prot
,
957 .ops
= &inet6_seqpacket_ops
,
960 .flags
= SCTP_PROTOSW_FLAG
,
963 static int sctp6_rcv(struct sk_buff
*skb
)
965 return sctp_rcv(skb
) ? -1 : 0;
968 static struct inet6_protocol sctpv6_protocol
= {
969 .handler
= sctp6_rcv
,
970 .err_handler
= sctp_v6_err
,
971 .flags
= INET6_PROTO_NOPOLICY
| INET6_PROTO_FINAL
,
974 static struct sctp_af sctp_af_inet6
= {
975 .sa_family
= AF_INET6
,
976 .sctp_xmit
= sctp_v6_xmit
,
977 .setsockopt
= ipv6_setsockopt
,
978 .getsockopt
= ipv6_getsockopt
,
979 .get_dst
= sctp_v6_get_dst
,
980 .get_saddr
= sctp_v6_get_saddr
,
981 .copy_addrlist
= sctp_v6_copy_addrlist
,
982 .from_skb
= sctp_v6_from_skb
,
983 .from_sk
= sctp_v6_from_sk
,
984 .to_sk_saddr
= sctp_v6_to_sk_saddr
,
985 .to_sk_daddr
= sctp_v6_to_sk_daddr
,
986 .from_addr_param
= sctp_v6_from_addr_param
,
987 .to_addr_param
= sctp_v6_to_addr_param
,
988 .dst_saddr
= sctp_v6_dst_saddr
,
989 .cmp_addr
= sctp_v6_cmp_addr
,
990 .scope
= sctp_v6_scope
,
991 .addr_valid
= sctp_v6_addr_valid
,
992 .inaddr_any
= sctp_v6_inaddr_any
,
993 .is_any
= sctp_v6_is_any
,
994 .available
= sctp_v6_available
,
995 .skb_iif
= sctp_v6_skb_iif
,
996 .is_ce
= sctp_v6_is_ce
,
997 .seq_dump_addr
= sctp_v6_seq_dump_addr
,
998 .net_header_len
= sizeof(struct ipv6hdr
),
999 .sockaddr_len
= sizeof(struct sockaddr_in6
),
1000 #ifdef CONFIG_COMPAT
1001 .compat_setsockopt
= compat_ipv6_setsockopt
,
1002 .compat_getsockopt
= compat_ipv6_getsockopt
,
1006 static struct sctp_pf sctp_pf_inet6
= {
1007 .event_msgname
= sctp_inet6_event_msgname
,
1008 .skb_msgname
= sctp_inet6_skb_msgname
,
1009 .af_supported
= sctp_inet6_af_supported
,
1010 .cmp_addr
= sctp_inet6_cmp_addr
,
1011 .bind_verify
= sctp_inet6_bind_verify
,
1012 .send_verify
= sctp_inet6_send_verify
,
1013 .supported_addrs
= sctp_inet6_supported_addrs
,
1014 .create_accept_sk
= sctp_v6_create_accept_sk
,
1015 .addr_v4map
= sctp_v6_addr_v4map
,
1016 .af
= &sctp_af_inet6
,
1019 /* Initialize IPv6 support and register with socket layer. */
1020 void sctp_v6_pf_init(void)
1022 /* Register the SCTP specific PF_INET6 functions. */
1023 sctp_register_pf(&sctp_pf_inet6
, PF_INET6
);
1025 /* Register the SCTP specific AF_INET6 functions. */
1026 sctp_register_af(&sctp_af_inet6
);
1029 void sctp_v6_pf_exit(void)
1031 list_del(&sctp_af_inet6
.list
);
1034 /* Initialize IPv6 support and register with socket layer. */
1035 int sctp_v6_protosw_init(void)
1039 rc
= proto_register(&sctpv6_prot
, 1);
1043 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1044 inet6_register_protosw(&sctpv6_seqpacket_protosw
);
1045 inet6_register_protosw(&sctpv6_stream_protosw
);
1050 void sctp_v6_protosw_exit(void)
1052 inet6_unregister_protosw(&sctpv6_seqpacket_protosw
);
1053 inet6_unregister_protosw(&sctpv6_stream_protosw
);
1054 proto_unregister(&sctpv6_prot
);
1058 /* Register with inet6 layer. */
1059 int sctp_v6_add_protocol(void)
1061 /* Register notifier for inet6 address additions/deletions. */
1062 register_inet6addr_notifier(&sctp_inet6addr_notifier
);
1064 if (inet6_add_protocol(&sctpv6_protocol
, IPPROTO_SCTP
) < 0)
1070 /* Unregister with inet6 layer. */
1071 void sctp_v6_del_protocol(void)
1073 inet6_del_protocol(&sctpv6_protocol
, IPPROTO_SCTP
);
1074 unregister_inet6addr_notifier(&sctp_inet6addr_notifier
);