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
;
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 __func__
, 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 __func__
, NIP6(fl
.fl6_dst
));
254 ipv6_addr_copy(&fl
.fl6_src
, &saddr
->v6
.sin6_addr
);
256 "SRC=" NIP6_FMT
" - ",
260 dst
= ip6_route_output(&init_net
, 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
;
305 struct sctp_sockaddr_entry
*laddr
;
307 union sctp_addr
*baddr
= NULL
;
311 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
312 "daddr:" NIP6_FMT
" ",
313 __func__
, asoc
, dst
, NIP6(daddr
->v6
.sin6_addr
));
316 ipv6_dev_get_saddr(dst
? ip6_dst_idev(dst
)->dev
: NULL
,
317 &daddr
->v6
.sin6_addr
, &saddr
->v6
.sin6_addr
);
318 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT
"\n",
319 NIP6(saddr
->v6
.sin6_addr
));
323 scope
= sctp_scope(daddr
);
325 bp
= &asoc
->base
.bind_addr
;
327 /* Go through the bind address list and find the best source address
328 * that matches the scope of the destination address.
331 list_for_each_entry_rcu(laddr
, &bp
->address_list
, list
) {
334 if ((laddr
->state
== SCTP_ADDR_SRC
) &&
335 (laddr
->a
.sa
.sa_family
== AF_INET6
) &&
336 (scope
<= sctp_scope(&laddr
->a
))) {
337 bmatchlen
= sctp_v6_addr_match_len(daddr
, &laddr
->a
);
338 if (!baddr
|| (matchlen
< bmatchlen
)) {
340 matchlen
= bmatchlen
;
346 memcpy(saddr
, baddr
, sizeof(union sctp_addr
));
347 SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT
"\n",
348 NIP6(saddr
->v6
.sin6_addr
));
350 printk(KERN_ERR
"%s: asoc:%p Could not find a valid source "
351 "address for the dest:" NIP6_FMT
"\n",
352 __func__
, asoc
, NIP6(daddr
->v6
.sin6_addr
));
358 /* Make a copy of all potential local addresses. */
359 static void sctp_v6_copy_addrlist(struct list_head
*addrlist
,
360 struct net_device
*dev
)
362 struct inet6_dev
*in6_dev
;
363 struct inet6_ifaddr
*ifp
;
364 struct sctp_sockaddr_entry
*addr
;
367 if ((in6_dev
= __in6_dev_get(dev
)) == NULL
) {
372 read_lock_bh(&in6_dev
->lock
);
373 for (ifp
= in6_dev
->addr_list
; ifp
; ifp
= ifp
->if_next
) {
374 /* Add the address to the local list. */
375 addr
= t_new(struct sctp_sockaddr_entry
, GFP_ATOMIC
);
377 addr
->a
.v6
.sin6_family
= AF_INET6
;
378 addr
->a
.v6
.sin6_port
= 0;
379 addr
->a
.v6
.sin6_addr
= ifp
->addr
;
380 addr
->a
.v6
.sin6_scope_id
= dev
->ifindex
;
382 INIT_LIST_HEAD(&addr
->list
);
383 INIT_RCU_HEAD(&addr
->rcu
);
384 list_add_tail(&addr
->list
, addrlist
);
388 read_unlock_bh(&in6_dev
->lock
);
392 /* Initialize a sockaddr_storage from in incoming skb. */
393 static void sctp_v6_from_skb(union sctp_addr
*addr
,struct sk_buff
*skb
,
400 port
= &addr
->v6
.sin6_port
;
401 addr
->v6
.sin6_family
= AF_INET6
;
402 addr
->v6
.sin6_flowinfo
= 0; /* FIXME */
403 addr
->v6
.sin6_scope_id
= ((struct inet6_skb_parm
*)skb
->cb
)->iif
;
408 from
= &ipv6_hdr(skb
)->saddr
;
411 from
= &ipv6_hdr(skb
)->daddr
;
413 ipv6_addr_copy(&addr
->v6
.sin6_addr
, from
);
416 /* Initialize an sctp_addr from a socket. */
417 static void sctp_v6_from_sk(union sctp_addr
*addr
, struct sock
*sk
)
419 addr
->v6
.sin6_family
= AF_INET6
;
420 addr
->v6
.sin6_port
= 0;
421 addr
->v6
.sin6_addr
= inet6_sk(sk
)->rcv_saddr
;
424 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
425 static void sctp_v6_to_sk_saddr(union sctp_addr
*addr
, struct sock
*sk
)
427 if (addr
->sa
.sa_family
== AF_INET
&& sctp_sk(sk
)->v4mapped
) {
428 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[0] = 0;
429 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[1] = 0;
430 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[2] = htonl(0x0000ffff);
431 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[3] =
432 addr
->v4
.sin_addr
.s_addr
;
434 inet6_sk(sk
)->rcv_saddr
= addr
->v6
.sin6_addr
;
438 /* Initialize sk->sk_daddr from sctp_addr. */
439 static void sctp_v6_to_sk_daddr(union sctp_addr
*addr
, struct sock
*sk
)
441 if (addr
->sa
.sa_family
== AF_INET
&& sctp_sk(sk
)->v4mapped
) {
442 inet6_sk(sk
)->daddr
.s6_addr32
[0] = 0;
443 inet6_sk(sk
)->daddr
.s6_addr32
[1] = 0;
444 inet6_sk(sk
)->daddr
.s6_addr32
[2] = htonl(0x0000ffff);
445 inet6_sk(sk
)->daddr
.s6_addr32
[3] = addr
->v4
.sin_addr
.s_addr
;
447 inet6_sk(sk
)->daddr
= addr
->v6
.sin6_addr
;
451 /* Initialize a sctp_addr from an address parameter. */
452 static void sctp_v6_from_addr_param(union sctp_addr
*addr
,
453 union sctp_addr_param
*param
,
454 __be16 port
, int iif
)
456 addr
->v6
.sin6_family
= AF_INET6
;
457 addr
->v6
.sin6_port
= port
;
458 addr
->v6
.sin6_flowinfo
= 0; /* BUG */
459 ipv6_addr_copy(&addr
->v6
.sin6_addr
, ¶m
->v6
.addr
);
460 addr
->v6
.sin6_scope_id
= iif
;
463 /* Initialize an address parameter from a sctp_addr and return the length
464 * of the address parameter.
466 static int sctp_v6_to_addr_param(const union sctp_addr
*addr
,
467 union sctp_addr_param
*param
)
469 int length
= sizeof(sctp_ipv6addr_param_t
);
471 param
->v6
.param_hdr
.type
= SCTP_PARAM_IPV6_ADDRESS
;
472 param
->v6
.param_hdr
.length
= htons(length
);
473 ipv6_addr_copy(¶m
->v6
.addr
, &addr
->v6
.sin6_addr
);
478 /* Initialize a sctp_addr from a dst_entry. */
479 static void sctp_v6_dst_saddr(union sctp_addr
*addr
, struct dst_entry
*dst
,
482 struct rt6_info
*rt
= (struct rt6_info
*)dst
;
483 addr
->sa
.sa_family
= AF_INET6
;
484 addr
->v6
.sin6_port
= port
;
485 ipv6_addr_copy(&addr
->v6
.sin6_addr
, &rt
->rt6i_src
.addr
);
488 /* Compare addresses exactly.
489 * v4-mapped-v6 is also in consideration.
491 static int sctp_v6_cmp_addr(const union sctp_addr
*addr1
,
492 const union sctp_addr
*addr2
)
494 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
) {
495 if (addr1
->sa
.sa_family
== AF_INET
&&
496 addr2
->sa
.sa_family
== AF_INET6
&&
497 ipv6_addr_v4mapped(&addr2
->v6
.sin6_addr
)) {
498 if (addr2
->v6
.sin6_port
== addr1
->v4
.sin_port
&&
499 addr2
->v6
.sin6_addr
.s6_addr32
[3] ==
500 addr1
->v4
.sin_addr
.s_addr
)
503 if (addr2
->sa
.sa_family
== AF_INET
&&
504 addr1
->sa
.sa_family
== AF_INET6
&&
505 ipv6_addr_v4mapped(&addr1
->v6
.sin6_addr
)) {
506 if (addr1
->v6
.sin6_port
== addr2
->v4
.sin_port
&&
507 addr1
->v6
.sin6_addr
.s6_addr32
[3] ==
508 addr2
->v4
.sin_addr
.s_addr
)
513 if (!ipv6_addr_equal(&addr1
->v6
.sin6_addr
, &addr2
->v6
.sin6_addr
))
515 /* If this is a linklocal address, compare the scope_id. */
516 if (ipv6_addr_type(&addr1
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
) {
517 if (addr1
->v6
.sin6_scope_id
&& addr2
->v6
.sin6_scope_id
&&
518 (addr1
->v6
.sin6_scope_id
!= addr2
->v6
.sin6_scope_id
)) {
526 /* Initialize addr struct to INADDR_ANY. */
527 static void sctp_v6_inaddr_any(union sctp_addr
*addr
, __be16 port
)
529 memset(addr
, 0x00, sizeof(union sctp_addr
));
530 addr
->v6
.sin6_family
= AF_INET6
;
531 addr
->v6
.sin6_port
= port
;
534 /* Is this a wildcard address? */
535 static int sctp_v6_is_any(const union sctp_addr
*addr
)
537 return ipv6_addr_any(&addr
->v6
.sin6_addr
);
540 /* Should this be available for binding? */
541 static int sctp_v6_available(union sctp_addr
*addr
, struct sctp_sock
*sp
)
544 struct in6_addr
*in6
= (struct in6_addr
*)&addr
->v6
.sin6_addr
;
546 type
= ipv6_addr_type(in6
);
547 if (IPV6_ADDR_ANY
== type
)
549 if (type
== IPV6_ADDR_MAPPED
) {
550 if (sp
&& !sp
->v4mapped
)
552 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
554 sctp_v6_map_v4(addr
);
555 return sctp_get_af_specific(AF_INET
)->available(addr
, sp
);
557 if (!(type
& IPV6_ADDR_UNICAST
))
560 return ipv6_chk_addr(&init_net
, in6
, NULL
, 0);
563 /* This function checks if the address is a valid address to be used for
567 * Return 0 - If the address is a non-unicast or an illegal address.
568 * Return 1 - If the address is a unicast.
570 static int sctp_v6_addr_valid(union sctp_addr
*addr
,
571 struct sctp_sock
*sp
,
572 const struct sk_buff
*skb
)
574 int ret
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
576 /* Support v4-mapped-v6 address. */
577 if (ret
== IPV6_ADDR_MAPPED
) {
578 /* Note: This routine is used in input, so v4-mapped-v6
579 * are disallowed here when there is no sctp_sock.
581 if (!sp
|| !sp
->v4mapped
)
583 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
585 sctp_v6_map_v4(addr
);
586 return sctp_get_af_specific(AF_INET
)->addr_valid(addr
, sp
, skb
);
589 /* Is this a non-unicast address */
590 if (!(ret
& IPV6_ADDR_UNICAST
))
596 /* What is the scope of 'addr'? */
597 static sctp_scope_t
sctp_v6_scope(union sctp_addr
*addr
)
602 /* The IPv6 scope is really a set of bit fields.
603 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
606 v6scope
= ipv6_addr_scope(&addr
->v6
.sin6_addr
);
609 retval
= SCTP_SCOPE_LOOPBACK
;
612 retval
= SCTP_SCOPE_LINK
;
615 retval
= SCTP_SCOPE_PRIVATE
;
618 retval
= SCTP_SCOPE_GLOBAL
;
625 /* Create and initialize a new sk for the socket to be returned by accept(). */
626 static struct sock
*sctp_v6_create_accept_sk(struct sock
*sk
,
627 struct sctp_association
*asoc
)
629 struct inet_sock
*inet
= inet_sk(sk
);
631 struct inet_sock
*newinet
;
632 struct ipv6_pinfo
*newnp
, *np
= inet6_sk(sk
);
633 struct sctp6_sock
*newsctp6sk
;
635 newsk
= sk_alloc(sk
->sk_net
, PF_INET6
, GFP_KERNEL
, sk
->sk_prot
);
639 sock_init_data(NULL
, newsk
);
641 newsk
->sk_type
= SOCK_STREAM
;
643 newsk
->sk_prot
= sk
->sk_prot
;
644 newsk
->sk_no_check
= sk
->sk_no_check
;
645 newsk
->sk_reuse
= sk
->sk_reuse
;
647 newsk
->sk_destruct
= inet_sock_destruct
;
648 newsk
->sk_family
= PF_INET6
;
649 newsk
->sk_protocol
= IPPROTO_SCTP
;
650 newsk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
651 newsk
->sk_shutdown
= sk
->sk_shutdown
;
652 sock_reset_flag(sk
, SOCK_ZAPPED
);
654 newsctp6sk
= (struct sctp6_sock
*)newsk
;
655 inet_sk(newsk
)->pinet6
= &newsctp6sk
->inet6
;
657 sctp_sk(newsk
)->v4mapped
= sctp_sk(sk
)->v4mapped
;
659 newinet
= inet_sk(newsk
);
660 newnp
= inet6_sk(newsk
);
662 memcpy(newnp
, np
, sizeof(struct ipv6_pinfo
));
664 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
667 newinet
->sport
= inet
->sport
;
668 newnp
->saddr
= np
->saddr
;
669 newnp
->rcv_saddr
= np
->rcv_saddr
;
670 newinet
->dport
= htons(asoc
->peer
.port
);
671 sctp_v6_to_sk_daddr(&asoc
->peer
.primary_addr
, newsk
);
673 /* Init the ipv4 part of the socket since we can have sockets
674 * using v6 API for ipv4.
676 newinet
->uc_ttl
= -1;
677 newinet
->mc_loop
= 1;
679 newinet
->mc_index
= 0;
680 newinet
->mc_list
= NULL
;
682 if (ipv4_config
.no_pmtu_disc
)
683 newinet
->pmtudisc
= IP_PMTUDISC_DONT
;
685 newinet
->pmtudisc
= IP_PMTUDISC_WANT
;
687 sk_refcnt_debug_inc(newsk
);
689 if (newsk
->sk_prot
->init(newsk
)) {
690 sk_common_release(newsk
);
698 /* Map v4 address to mapped v6 address */
699 static void sctp_v6_addr_v4map(struct sctp_sock
*sp
, union sctp_addr
*addr
)
701 if (sp
->v4mapped
&& AF_INET
== addr
->sa
.sa_family
)
702 sctp_v4_map_v6(addr
);
705 /* Where did this skb come from? */
706 static int sctp_v6_skb_iif(const struct sk_buff
*skb
)
708 struct inet6_skb_parm
*opt
= (struct inet6_skb_parm
*) skb
->cb
;
712 /* Was this packet marked by Explicit Congestion Notification? */
713 static int sctp_v6_is_ce(const struct sk_buff
*skb
)
715 return *((__u32
*)(ipv6_hdr(skb
))) & htonl(1 << 20);
718 /* Dump the v6 addr to the seq file. */
719 static void sctp_v6_seq_dump_addr(struct seq_file
*seq
, union sctp_addr
*addr
)
721 seq_printf(seq
, NIP6_FMT
" ", NIP6(addr
->v6
.sin6_addr
));
724 /* Initialize a PF_INET6 socket msg_name. */
725 static void sctp_inet6_msgname(char *msgname
, int *addr_len
)
727 struct sockaddr_in6
*sin6
;
729 sin6
= (struct sockaddr_in6
*)msgname
;
730 sin6
->sin6_family
= AF_INET6
;
731 sin6
->sin6_flowinfo
= 0;
732 sin6
->sin6_scope_id
= 0; /*FIXME */
733 *addr_len
= sizeof(struct sockaddr_in6
);
736 /* Initialize a PF_INET msgname from a ulpevent. */
737 static void sctp_inet6_event_msgname(struct sctp_ulpevent
*event
,
738 char *msgname
, int *addrlen
)
740 struct sockaddr_in6
*sin6
, *sin6from
;
743 union sctp_addr
*addr
;
744 struct sctp_association
*asoc
;
747 sctp_inet6_msgname(msgname
, addrlen
);
748 sin6
= (struct sockaddr_in6
*)msgname
;
749 sin6
->sin6_port
= htons(asoc
->peer
.port
);
750 addr
= &asoc
->peer
.primary_addr
;
752 /* Note: If we go to a common v6 format, this code
756 /* Map ipv4 address into v4-mapped-on-v6 address. */
757 if (sctp_sk(asoc
->base
.sk
)->v4mapped
&&
758 AF_INET
== addr
->sa
.sa_family
) {
759 sctp_v4_map_v6((union sctp_addr
*)sin6
);
760 sin6
->sin6_addr
.s6_addr32
[3] =
761 addr
->v4
.sin_addr
.s_addr
;
765 sin6from
= &asoc
->peer
.primary_addr
.v6
;
766 ipv6_addr_copy(&sin6
->sin6_addr
, &sin6from
->sin6_addr
);
767 if (ipv6_addr_type(&sin6
->sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
768 sin6
->sin6_scope_id
= sin6from
->sin6_scope_id
;
772 /* Initialize a msg_name from an inbound skb. */
773 static void sctp_inet6_skb_msgname(struct sk_buff
*skb
, char *msgname
,
777 struct sockaddr_in6
*sin6
;
780 sctp_inet6_msgname(msgname
, addr_len
);
781 sin6
= (struct sockaddr_in6
*)msgname
;
783 sin6
->sin6_port
= sh
->source
;
785 /* Map ipv4 address into v4-mapped-on-v6 address. */
786 if (sctp_sk(skb
->sk
)->v4mapped
&&
787 ip_hdr(skb
)->version
== 4) {
788 sctp_v4_map_v6((union sctp_addr
*)sin6
);
789 sin6
->sin6_addr
.s6_addr32
[3] = ip_hdr(skb
)->saddr
;
793 /* Otherwise, just copy the v6 address. */
794 ipv6_addr_copy(&sin6
->sin6_addr
, &ipv6_hdr(skb
)->saddr
);
795 if (ipv6_addr_type(&sin6
->sin6_addr
) & IPV6_ADDR_LINKLOCAL
) {
796 struct sctp_ulpevent
*ev
= sctp_skb2event(skb
);
797 sin6
->sin6_scope_id
= ev
->iif
;
802 /* Do we support this AF? */
803 static int sctp_inet6_af_supported(sa_family_t family
, struct sctp_sock
*sp
)
808 /* v4-mapped-v6 addresses */
810 if (!__ipv6_only_sock(sctp_opt2sk(sp
)) && sp
->v4mapped
)
817 /* Address matching with wildcards allowed. This extra level
818 * of indirection lets us choose whether a PF_INET6 should
819 * disallow any v4 addresses if we so choose.
821 static int sctp_inet6_cmp_addr(const union sctp_addr
*addr1
,
822 const union sctp_addr
*addr2
,
823 struct sctp_sock
*opt
)
825 struct sctp_af
*af1
, *af2
;
827 af1
= sctp_get_af_specific(addr1
->sa
.sa_family
);
828 af2
= sctp_get_af_specific(addr2
->sa
.sa_family
);
832 /* Today, wildcard AF_INET/AF_INET6. */
833 if (sctp_is_any(addr1
) || sctp_is_any(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
)
859 dev
= dev_get_by_index(&init_net
, addr
->v6
.sin6_scope_id
);
862 if (!ipv6_chk_addr(&init_net
, &addr
->v6
.sin6_addr
,
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(&init_net
, 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
*skb
)
961 return sctp_rcv(skb
) ? -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_af_inet6
= {
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
= {
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_af_inet6
,
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
, PF_INET6
);
1023 /* Register the SCTP specific AF_INET6 functions. */
1024 sctp_register_af(&sctp_af_inet6
);
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_af_inet6
.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
);