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, see
25 * <http://www.gnu.org/licenses/>.
27 * Please send any bug reports or fixes you make to the
29 * lksctp developers <linux-sctp@vger.kernel.org>
31 * Written or modified by:
32 * Le Yanqun <yanqun.le@nokia.com>
33 * Hui Huang <hui.huang@nokia.com>
34 * La Monte H.P. Yarroll <piggy@acm.org>
35 * Sridhar Samudrala <sri@us.ibm.com>
36 * Jon Grimm <jgrimm@us.ibm.com>
37 * Ardelle Fan <ardelle.fan@intel.com>
40 * linux/net/ipv6/tcp_ipv6.c
43 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
45 #include <linux/module.h>
46 #include <linux/errno.h>
47 #include <linux/types.h>
48 #include <linux/socket.h>
49 #include <linux/sockios.h>
50 #include <linux/net.h>
52 #include <linux/in6.h>
53 #include <linux/netdevice.h>
54 #include <linux/init.h>
55 #include <linux/ipsec.h>
56 #include <linux/slab.h>
58 #include <linux/ipv6.h>
59 #include <linux/icmpv6.h>
60 #include <linux/random.h>
61 #include <linux/seq_file.h>
63 #include <net/protocol.h>
64 #include <net/ndisc.h>
67 #include <net/transp_v6.h>
68 #include <net/addrconf.h>
69 #include <net/ip6_route.h>
70 #include <net/inet_common.h>
71 #include <net/inet_ecn.h>
72 #include <net/sctp/sctp.h>
74 #include <linux/uaccess.h>
76 static inline int sctp_v6_addr_match_len(union sctp_addr
*s1
,
78 static void sctp_v6_to_addr(union sctp_addr
*addr
, struct in6_addr
*saddr
,
80 static int sctp_v6_cmp_addr(const union sctp_addr
*addr1
,
81 const union sctp_addr
*addr2
);
83 /* Event handler for inet6 address addition/deletion events.
84 * The sctp_local_addr_list needs to be protocted by a spin lock since
85 * multiple notifiers (say IPv4 and IPv6) may be running at the same
86 * time and thus corrupt the list.
87 * The reader side is protected with RCU.
89 static int sctp_inet6addr_event(struct notifier_block
*this, unsigned long ev
,
92 struct inet6_ifaddr
*ifa
= (struct inet6_ifaddr
*)ptr
;
93 struct sctp_sockaddr_entry
*addr
= NULL
;
94 struct sctp_sockaddr_entry
*temp
;
95 struct net
*net
= dev_net(ifa
->idev
->dev
);
100 addr
= kmalloc(sizeof(struct sctp_sockaddr_entry
), GFP_ATOMIC
);
102 addr
->a
.v6
.sin6_family
= AF_INET6
;
103 addr
->a
.v6
.sin6_port
= 0;
104 addr
->a
.v6
.sin6_addr
= ifa
->addr
;
105 addr
->a
.v6
.sin6_scope_id
= ifa
->idev
->dev
->ifindex
;
107 spin_lock_bh(&net
->sctp
.local_addr_lock
);
108 list_add_tail_rcu(&addr
->list
, &net
->sctp
.local_addr_list
);
109 sctp_addr_wq_mgmt(net
, addr
, SCTP_ADDR_NEW
);
110 spin_unlock_bh(&net
->sctp
.local_addr_lock
);
114 spin_lock_bh(&net
->sctp
.local_addr_lock
);
115 list_for_each_entry_safe(addr
, temp
,
116 &net
->sctp
.local_addr_list
, list
) {
117 if (addr
->a
.sa
.sa_family
== AF_INET6
&&
118 ipv6_addr_equal(&addr
->a
.v6
.sin6_addr
,
120 sctp_addr_wq_mgmt(net
, addr
, SCTP_ADDR_DEL
);
123 list_del_rcu(&addr
->list
);
127 spin_unlock_bh(&net
->sctp
.local_addr_lock
);
129 kfree_rcu(addr
, rcu
);
136 static struct notifier_block sctp_inet6addr_notifier
= {
137 .notifier_call
= sctp_inet6addr_event
,
140 /* ICMP error handler. */
141 static void sctp_v6_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
142 u8 type
, u8 code
, int offset
, __be32 info
)
144 struct inet6_dev
*idev
;
146 struct sctp_association
*asoc
;
147 struct sctp_transport
*transport
;
148 struct ipv6_pinfo
*np
;
149 __u16 saveip
, savesctp
;
151 struct net
*net
= dev_net(skb
->dev
);
153 idev
= in6_dev_get(skb
->dev
);
155 /* Fix up skb to look at the embedded net header. */
156 saveip
= skb
->network_header
;
157 savesctp
= skb
->transport_header
;
158 skb_reset_network_header(skb
);
159 skb_set_transport_header(skb
, offset
);
160 sk
= sctp_err_lookup(net
, AF_INET6
, skb
, sctp_hdr(skb
), &asoc
, &transport
);
161 /* Put back, the original pointers. */
162 skb
->network_header
= saveip
;
163 skb
->transport_header
= savesctp
;
165 __ICMP6_INC_STATS(net
, idev
, ICMP6_MIB_INERRORS
);
169 /* Warning: The sock lock is held. Remember to call
174 case ICMPV6_PKT_TOOBIG
:
175 if (ip6_sk_accept_pmtu(sk
))
176 sctp_icmp_frag_needed(sk
, asoc
, transport
, ntohl(info
));
178 case ICMPV6_PARAMPROB
:
179 if (ICMPV6_UNK_NEXTHDR
== code
) {
180 sctp_icmp_proto_unreachable(sk
, asoc
, transport
);
185 sctp_icmp_redirect(sk
, transport
, skb
);
192 icmpv6_err_convert(type
, code
, &err
);
193 if (!sock_owned_by_user(sk
) && np
->recverr
) {
195 sk
->sk_error_report(sk
);
196 } else { /* Only an error on timeout */
197 sk
->sk_err_soft
= err
;
201 sctp_err_finish(sk
, transport
);
203 if (likely(idev
!= NULL
))
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
);
211 struct flowi6
*fl6
= &transport
->fl
.u
.ip6
;
214 pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__
, skb
,
215 skb
->len
, &fl6
->saddr
, &fl6
->daddr
);
217 IP6_ECN_flow_xmit(sk
, fl6
->flowlabel
);
219 if (!(transport
->param_flags
& SPP_PMTUD_ENABLE
))
222 SCTP_INC_STATS(sock_net(sk
), SCTP_MIB_OUTSCTPPACKS
);
225 res
= ip6_xmit(sk
, skb
, fl6
, sk
->sk_mark
, rcu_dereference(np
->opt
),
231 /* Returns the dst cache entry for the given source and destination ip
234 static void sctp_v6_get_dst(struct sctp_transport
*t
, union sctp_addr
*saddr
,
235 struct flowi
*fl
, struct sock
*sk
)
237 struct sctp_association
*asoc
= t
->asoc
;
238 struct dst_entry
*dst
= NULL
;
239 struct flowi6
*fl6
= &fl
->u
.ip6
;
240 struct sctp_bind_addr
*bp
;
241 struct ipv6_pinfo
*np
= inet6_sk(sk
);
242 struct sctp_sockaddr_entry
*laddr
;
243 union sctp_addr
*daddr
= &t
->ipaddr
;
244 union sctp_addr dst_saddr
;
245 struct in6_addr
*final_p
, final
;
249 memset(fl6
, 0, sizeof(struct flowi6
));
250 fl6
->daddr
= daddr
->v6
.sin6_addr
;
251 fl6
->fl6_dport
= daddr
->v6
.sin6_port
;
252 fl6
->flowi6_proto
= IPPROTO_SCTP
;
253 if (ipv6_addr_type(&daddr
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
254 fl6
->flowi6_oif
= daddr
->v6
.sin6_scope_id
;
256 pr_debug("%s: dst=%pI6 ", __func__
, &fl6
->daddr
);
259 fl6
->fl6_sport
= htons(asoc
->base
.bind_addr
.port
);
262 fl6
->saddr
= saddr
->v6
.sin6_addr
;
263 fl6
->fl6_sport
= saddr
->v6
.sin6_port
;
265 pr_debug("src=%pI6 - ", &fl6
->saddr
);
269 final_p
= fl6_update_dst(fl6
, rcu_dereference(np
->opt
), &final
);
272 dst
= ip6_dst_lookup_flow(sk
, fl6
, final_p
);
276 bp
= &asoc
->base
.bind_addr
;
277 scope
= sctp_scope(daddr
);
278 /* ip6_dst_lookup has filled in the fl6->saddr for us. Check
279 * to see if we can use it.
282 /* Walk through the bind address list and look for a bind
283 * address that matches the source address of the returned dst.
285 sctp_v6_to_addr(&dst_saddr
, &fl6
->saddr
, htons(bp
->port
));
287 list_for_each_entry_rcu(laddr
, &bp
->address_list
, list
) {
288 if (!laddr
->valid
|| laddr
->state
== SCTP_ADDR_DEL
||
289 (laddr
->state
!= SCTP_ADDR_SRC
&&
290 !asoc
->src_out_of_asoc_ok
))
293 /* Do not compare against v4 addrs */
294 if ((laddr
->a
.sa
.sa_family
== AF_INET6
) &&
295 (sctp_v6_cmp_addr(&dst_saddr
, &laddr
->a
))) {
301 /* None of the bound addresses match the source address of the
302 * dst. So release it.
308 /* Walk through the bind address list and try to get the
309 * best source address for a given destination.
312 list_for_each_entry_rcu(laddr
, &bp
->address_list
, list
) {
313 struct dst_entry
*bdst
;
317 laddr
->state
!= SCTP_ADDR_SRC
||
318 laddr
->a
.sa
.sa_family
!= AF_INET6
||
319 scope
> sctp_scope(&laddr
->a
))
322 fl6
->saddr
= laddr
->a
.v6
.sin6_addr
;
323 fl6
->fl6_sport
= laddr
->a
.v6
.sin6_port
;
324 final_p
= fl6_update_dst(fl6
, rcu_dereference(np
->opt
), &final
);
325 bdst
= ip6_dst_lookup_flow(sk
, fl6
, final_p
);
328 ipv6_chk_addr(dev_net(bdst
->dev
),
329 &laddr
->a
.v6
.sin6_addr
, bdst
->dev
, 1)) {
330 if (!IS_ERR_OR_NULL(dst
))
336 bmatchlen
= sctp_v6_addr_match_len(daddr
, &laddr
->a
);
337 if (matchlen
> bmatchlen
)
340 if (!IS_ERR_OR_NULL(dst
))
343 matchlen
= bmatchlen
;
348 if (!IS_ERR_OR_NULL(dst
)) {
351 rt
= (struct rt6_info
*)dst
;
353 t
->dst_cookie
= rt6_get_cookie(rt
);
354 pr_debug("rt6_dst:%pI6/%d rt6_src:%pI6\n",
355 &rt
->rt6i_dst
.addr
, rt
->rt6i_dst
.plen
,
360 pr_debug("no route\n");
364 /* Returns the number of consecutive initial bits that match in the 2 ipv6
367 static inline int sctp_v6_addr_match_len(union sctp_addr
*s1
,
370 return ipv6_addr_diff(&s1
->v6
.sin6_addr
, &s2
->v6
.sin6_addr
);
373 /* Fills in the source address(saddr) based on the destination address(daddr)
374 * and asoc's bind address list.
376 static void sctp_v6_get_saddr(struct sctp_sock
*sk
,
377 struct sctp_transport
*t
,
380 struct flowi6
*fl6
= &fl
->u
.ip6
;
381 union sctp_addr
*saddr
= &t
->saddr
;
383 pr_debug("%s: asoc:%p dst:%p\n", __func__
, t
->asoc
, t
->dst
);
386 saddr
->v6
.sin6_family
= AF_INET6
;
387 saddr
->v6
.sin6_addr
= fl6
->saddr
;
391 /* Make a copy of all potential local addresses. */
392 static void sctp_v6_copy_addrlist(struct list_head
*addrlist
,
393 struct net_device
*dev
)
395 struct inet6_dev
*in6_dev
;
396 struct inet6_ifaddr
*ifp
;
397 struct sctp_sockaddr_entry
*addr
;
400 if ((in6_dev
= __in6_dev_get(dev
)) == NULL
) {
405 read_lock_bh(&in6_dev
->lock
);
406 list_for_each_entry(ifp
, &in6_dev
->addr_list
, if_list
) {
407 /* Add the address to the local list. */
408 addr
= kzalloc(sizeof(*addr
), GFP_ATOMIC
);
410 addr
->a
.v6
.sin6_family
= AF_INET6
;
411 addr
->a
.v6
.sin6_port
= 0;
412 addr
->a
.v6
.sin6_addr
= ifp
->addr
;
413 addr
->a
.v6
.sin6_scope_id
= dev
->ifindex
;
415 INIT_LIST_HEAD(&addr
->list
);
416 list_add_tail(&addr
->list
, addrlist
);
420 read_unlock_bh(&in6_dev
->lock
);
424 /* Initialize a sockaddr_storage from in incoming skb. */
425 static void sctp_v6_from_skb(union sctp_addr
*addr
, struct sk_buff
*skb
,
428 /* Always called on head skb, so this is safe */
429 struct sctphdr
*sh
= sctp_hdr(skb
);
430 struct sockaddr_in6
*sa
= &addr
->v6
;
432 addr
->v6
.sin6_family
= AF_INET6
;
433 addr
->v6
.sin6_flowinfo
= 0; /* FIXME */
434 addr
->v6
.sin6_scope_id
= ((struct inet6_skb_parm
*)skb
->cb
)->iif
;
437 sa
->sin6_port
= sh
->source
;
438 sa
->sin6_addr
= ipv6_hdr(skb
)->saddr
;
440 sa
->sin6_port
= sh
->dest
;
441 sa
->sin6_addr
= ipv6_hdr(skb
)->daddr
;
445 /* Initialize an sctp_addr from a socket. */
446 static void sctp_v6_from_sk(union sctp_addr
*addr
, struct sock
*sk
)
448 addr
->v6
.sin6_family
= AF_INET6
;
449 addr
->v6
.sin6_port
= 0;
450 addr
->v6
.sin6_addr
= sk
->sk_v6_rcv_saddr
;
453 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
454 static void sctp_v6_to_sk_saddr(union sctp_addr
*addr
, struct sock
*sk
)
456 if (addr
->sa
.sa_family
== AF_INET
) {
457 sk
->sk_v6_rcv_saddr
.s6_addr32
[0] = 0;
458 sk
->sk_v6_rcv_saddr
.s6_addr32
[1] = 0;
459 sk
->sk_v6_rcv_saddr
.s6_addr32
[2] = htonl(0x0000ffff);
460 sk
->sk_v6_rcv_saddr
.s6_addr32
[3] =
461 addr
->v4
.sin_addr
.s_addr
;
463 sk
->sk_v6_rcv_saddr
= addr
->v6
.sin6_addr
;
467 /* Initialize sk->sk_daddr from sctp_addr. */
468 static void sctp_v6_to_sk_daddr(union sctp_addr
*addr
, struct sock
*sk
)
470 if (addr
->sa
.sa_family
== AF_INET
) {
471 sk
->sk_v6_daddr
.s6_addr32
[0] = 0;
472 sk
->sk_v6_daddr
.s6_addr32
[1] = 0;
473 sk
->sk_v6_daddr
.s6_addr32
[2] = htonl(0x0000ffff);
474 sk
->sk_v6_daddr
.s6_addr32
[3] = addr
->v4
.sin_addr
.s_addr
;
476 sk
->sk_v6_daddr
= addr
->v6
.sin6_addr
;
480 /* Initialize a sctp_addr from an address parameter. */
481 static void sctp_v6_from_addr_param(union sctp_addr
*addr
,
482 union sctp_addr_param
*param
,
483 __be16 port
, int iif
)
485 addr
->v6
.sin6_family
= AF_INET6
;
486 addr
->v6
.sin6_port
= port
;
487 addr
->v6
.sin6_flowinfo
= 0; /* BUG */
488 addr
->v6
.sin6_addr
= param
->v6
.addr
;
489 addr
->v6
.sin6_scope_id
= iif
;
492 /* Initialize an address parameter from a sctp_addr and return the length
493 * of the address parameter.
495 static int sctp_v6_to_addr_param(const union sctp_addr
*addr
,
496 union sctp_addr_param
*param
)
498 int length
= sizeof(sctp_ipv6addr_param_t
);
500 param
->v6
.param_hdr
.type
= SCTP_PARAM_IPV6_ADDRESS
;
501 param
->v6
.param_hdr
.length
= htons(length
);
502 param
->v6
.addr
= addr
->v6
.sin6_addr
;
507 /* Initialize a sctp_addr from struct in6_addr. */
508 static void sctp_v6_to_addr(union sctp_addr
*addr
, struct in6_addr
*saddr
,
511 addr
->sa
.sa_family
= AF_INET6
;
512 addr
->v6
.sin6_port
= port
;
513 addr
->v6
.sin6_addr
= *saddr
;
516 /* Compare addresses exactly.
517 * v4-mapped-v6 is also in consideration.
519 static int sctp_v6_cmp_addr(const union sctp_addr
*addr1
,
520 const union sctp_addr
*addr2
)
522 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
) {
523 if (addr1
->sa
.sa_family
== AF_INET
&&
524 addr2
->sa
.sa_family
== AF_INET6
&&
525 ipv6_addr_v4mapped(&addr2
->v6
.sin6_addr
)) {
526 if (addr2
->v6
.sin6_port
== addr1
->v4
.sin_port
&&
527 addr2
->v6
.sin6_addr
.s6_addr32
[3] ==
528 addr1
->v4
.sin_addr
.s_addr
)
531 if (addr2
->sa
.sa_family
== AF_INET
&&
532 addr1
->sa
.sa_family
== AF_INET6
&&
533 ipv6_addr_v4mapped(&addr1
->v6
.sin6_addr
)) {
534 if (addr1
->v6
.sin6_port
== addr2
->v4
.sin_port
&&
535 addr1
->v6
.sin6_addr
.s6_addr32
[3] ==
536 addr2
->v4
.sin_addr
.s_addr
)
541 if (addr1
->v6
.sin6_port
!= addr2
->v6
.sin6_port
)
543 if (!ipv6_addr_equal(&addr1
->v6
.sin6_addr
, &addr2
->v6
.sin6_addr
))
545 /* If this is a linklocal address, compare the scope_id. */
546 if (ipv6_addr_type(&addr1
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
) {
547 if (addr1
->v6
.sin6_scope_id
&& addr2
->v6
.sin6_scope_id
&&
548 (addr1
->v6
.sin6_scope_id
!= addr2
->v6
.sin6_scope_id
)) {
556 /* Initialize addr struct to INADDR_ANY. */
557 static void sctp_v6_inaddr_any(union sctp_addr
*addr
, __be16 port
)
559 memset(addr
, 0x00, sizeof(union sctp_addr
));
560 addr
->v6
.sin6_family
= AF_INET6
;
561 addr
->v6
.sin6_port
= port
;
564 /* Is this a wildcard address? */
565 static int sctp_v6_is_any(const union sctp_addr
*addr
)
567 return ipv6_addr_any(&addr
->v6
.sin6_addr
);
570 /* Should this be available for binding? */
571 static int sctp_v6_available(union sctp_addr
*addr
, struct sctp_sock
*sp
)
574 struct net
*net
= sock_net(&sp
->inet
.sk
);
575 const struct in6_addr
*in6
= (const struct in6_addr
*)&addr
->v6
.sin6_addr
;
577 type
= ipv6_addr_type(in6
);
578 if (IPV6_ADDR_ANY
== type
)
580 if (type
== IPV6_ADDR_MAPPED
) {
581 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
583 sctp_v6_map_v4(addr
);
584 return sctp_get_af_specific(AF_INET
)->available(addr
, sp
);
586 if (!(type
& IPV6_ADDR_UNICAST
))
589 return sp
->inet
.freebind
|| net
->ipv6
.sysctl
.ip_nonlocal_bind
||
590 ipv6_chk_addr(net
, in6
, NULL
, 0);
593 /* This function checks if the address is a valid address to be used for
597 * Return 0 - If the address is a non-unicast or an illegal address.
598 * Return 1 - If the address is a unicast.
600 static int sctp_v6_addr_valid(union sctp_addr
*addr
,
601 struct sctp_sock
*sp
,
602 const struct sk_buff
*skb
)
604 int ret
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
606 /* Support v4-mapped-v6 address. */
607 if (ret
== IPV6_ADDR_MAPPED
) {
608 /* Note: This routine is used in input, so v4-mapped-v6
609 * are disallowed here when there is no sctp_sock.
611 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
613 sctp_v6_map_v4(addr
);
614 return sctp_get_af_specific(AF_INET
)->addr_valid(addr
, sp
, skb
);
617 /* Is this a non-unicast address */
618 if (!(ret
& IPV6_ADDR_UNICAST
))
624 /* What is the scope of 'addr'? */
625 static sctp_scope_t
sctp_v6_scope(union sctp_addr
*addr
)
630 /* The IPv6 scope is really a set of bit fields.
631 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
634 v6scope
= ipv6_addr_scope(&addr
->v6
.sin6_addr
);
637 retval
= SCTP_SCOPE_LOOPBACK
;
640 retval
= SCTP_SCOPE_LINK
;
643 retval
= SCTP_SCOPE_PRIVATE
;
646 retval
= SCTP_SCOPE_GLOBAL
;
653 /* Create and initialize a new sk for the socket to be returned by accept(). */
654 static struct sock
*sctp_v6_create_accept_sk(struct sock
*sk
,
655 struct sctp_association
*asoc
,
659 struct ipv6_pinfo
*newnp
, *np
= inet6_sk(sk
);
660 struct sctp6_sock
*newsctp6sk
;
661 struct ipv6_txoptions
*opt
;
663 newsk
= sk_alloc(sock_net(sk
), PF_INET6
, GFP_KERNEL
, sk
->sk_prot
, kern
);
667 sock_init_data(NULL
, newsk
);
669 sctp_copy_sock(newsk
, sk
, asoc
);
670 sock_reset_flag(sk
, SOCK_ZAPPED
);
672 newsctp6sk
= (struct sctp6_sock
*)newsk
;
673 inet_sk(newsk
)->pinet6
= &newsctp6sk
->inet6
;
675 sctp_sk(newsk
)->v4mapped
= sctp_sk(sk
)->v4mapped
;
677 newnp
= inet6_sk(newsk
);
679 memcpy(newnp
, np
, sizeof(struct ipv6_pinfo
));
680 newnp
->ipv6_mc_list
= NULL
;
681 newnp
->ipv6_ac_list
= NULL
;
682 newnp
->ipv6_fl_list
= NULL
;
685 opt
= rcu_dereference(np
->opt
);
687 opt
= ipv6_dup_options(newsk
, opt
);
688 RCU_INIT_POINTER(newnp
->opt
, opt
);
691 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
694 sctp_v6_to_sk_daddr(&asoc
->peer
.primary_addr
, newsk
);
696 newsk
->sk_v6_rcv_saddr
= sk
->sk_v6_rcv_saddr
;
698 sk_refcnt_debug_inc(newsk
);
700 if (newsk
->sk_prot
->init(newsk
)) {
701 sk_common_release(newsk
);
709 /* Format a sockaddr for return to user space. This makes sure the return is
710 * AF_INET or AF_INET6 depending on the SCTP_I_WANT_MAPPED_V4_ADDR option.
712 static int sctp_v6_addr_to_user(struct sctp_sock
*sp
, union sctp_addr
*addr
)
715 if (addr
->sa
.sa_family
== AF_INET
)
716 sctp_v4_map_v6(addr
);
718 if (addr
->sa
.sa_family
== AF_INET6
&&
719 ipv6_addr_v4mapped(&addr
->v6
.sin6_addr
))
720 sctp_v6_map_v4(addr
);
723 if (addr
->sa
.sa_family
== AF_INET
)
724 return sizeof(struct sockaddr_in
);
725 return sizeof(struct sockaddr_in6
);
728 /* Where did this skb come from? */
729 static int sctp_v6_skb_iif(const struct sk_buff
*skb
)
731 return IP6CB(skb
)->iif
;
734 /* Was this packet marked by Explicit Congestion Notification? */
735 static int sctp_v6_is_ce(const struct sk_buff
*skb
)
737 return *((__u32
*)(ipv6_hdr(skb
))) & htonl(1 << 20);
740 /* Dump the v6 addr to the seq file. */
741 static void sctp_v6_seq_dump_addr(struct seq_file
*seq
, union sctp_addr
*addr
)
743 seq_printf(seq
, "%pI6 ", &addr
->v6
.sin6_addr
);
746 static void sctp_v6_ecn_capable(struct sock
*sk
)
748 inet6_sk(sk
)->tclass
|= INET_ECN_ECT_0
;
751 /* Initialize a PF_INET msgname from a ulpevent. */
752 static void sctp_inet6_event_msgname(struct sctp_ulpevent
*event
,
753 char *msgname
, int *addrlen
)
755 union sctp_addr
*addr
;
756 struct sctp_association
*asoc
;
757 union sctp_addr
*paddr
;
762 addr
= (union sctp_addr
*)msgname
;
764 paddr
= &asoc
->peer
.primary_addr
;
766 if (paddr
->sa
.sa_family
== AF_INET
) {
767 addr
->v4
.sin_family
= AF_INET
;
768 addr
->v4
.sin_port
= htons(asoc
->peer
.port
);
769 addr
->v4
.sin_addr
= paddr
->v4
.sin_addr
;
771 addr
->v6
.sin6_family
= AF_INET6
;
772 addr
->v6
.sin6_flowinfo
= 0;
773 if (ipv6_addr_type(&paddr
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
774 addr
->v6
.sin6_scope_id
= paddr
->v6
.sin6_scope_id
;
776 addr
->v6
.sin6_scope_id
= 0;
777 addr
->v6
.sin6_port
= htons(asoc
->peer
.port
);
778 addr
->v6
.sin6_addr
= paddr
->v6
.sin6_addr
;
781 *addrlen
= sctp_v6_addr_to_user(sctp_sk(asoc
->base
.sk
), addr
);
784 /* Initialize a msg_name from an inbound skb. */
785 static void sctp_inet6_skb_msgname(struct sk_buff
*skb
, char *msgname
,
788 union sctp_addr
*addr
;
794 addr
= (union sctp_addr
*)msgname
;
797 if (ip_hdr(skb
)->version
== 4) {
798 addr
->v4
.sin_family
= AF_INET
;
799 addr
->v4
.sin_port
= sh
->source
;
800 addr
->v4
.sin_addr
.s_addr
= ip_hdr(skb
)->saddr
;
802 addr
->v6
.sin6_family
= AF_INET6
;
803 addr
->v6
.sin6_flowinfo
= 0;
804 addr
->v6
.sin6_port
= sh
->source
;
805 addr
->v6
.sin6_addr
= ipv6_hdr(skb
)->saddr
;
806 if (ipv6_addr_type(&addr
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
) {
807 addr
->v6
.sin6_scope_id
= sctp_v6_skb_iif(skb
);
811 *addr_len
= sctp_v6_addr_to_user(sctp_sk(skb
->sk
), addr
);
814 /* Do we support this AF? */
815 static int sctp_inet6_af_supported(sa_family_t family
, struct sctp_sock
*sp
)
820 /* v4-mapped-v6 addresses */
822 if (!__ipv6_only_sock(sctp_opt2sk(sp
)))
829 /* Address matching with wildcards allowed. This extra level
830 * of indirection lets us choose whether a PF_INET6 should
831 * disallow any v4 addresses if we so choose.
833 static int sctp_inet6_cmp_addr(const union sctp_addr
*addr1
,
834 const union sctp_addr
*addr2
,
835 struct sctp_sock
*opt
)
837 struct sctp_af
*af1
, *af2
;
838 struct sock
*sk
= sctp_opt2sk(opt
);
840 af1
= sctp_get_af_specific(addr1
->sa
.sa_family
);
841 af2
= sctp_get_af_specific(addr2
->sa
.sa_family
);
846 /* If the socket is IPv6 only, v4 addrs will not match */
847 if (__ipv6_only_sock(sk
) && af1
!= af2
)
850 /* Today, wildcard AF_INET/AF_INET6. */
851 if (sctp_is_any(sk
, addr1
) || sctp_is_any(sk
, addr2
))
854 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
)
857 return af1
->cmp_addr(addr1
, addr2
);
860 /* Verify that the provided sockaddr looks bindable. Common verification,
861 * has already been taken care of.
863 static int sctp_inet6_bind_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
867 /* ASSERT: address family has already been verified. */
868 if (addr
->sa
.sa_family
!= AF_INET6
)
869 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
871 int type
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
872 struct net_device
*dev
;
874 if (type
& IPV6_ADDR_LINKLOCAL
) {
876 if (!addr
->v6
.sin6_scope_id
)
878 net
= sock_net(&opt
->inet
.sk
);
880 dev
= dev_get_by_index_rcu(net
, addr
->v6
.sin6_scope_id
);
882 !ipv6_chk_addr(net
, &addr
->v6
.sin6_addr
, dev
, 0)) {
891 return af
->available(addr
, opt
);
894 /* Verify that the provided sockaddr looks sendable. Common verification,
895 * has already been taken care of.
897 static int sctp_inet6_send_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
899 struct sctp_af
*af
= NULL
;
901 /* ASSERT: address family has already been verified. */
902 if (addr
->sa
.sa_family
!= AF_INET6
)
903 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
905 int type
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
906 struct net_device
*dev
;
908 if (type
& IPV6_ADDR_LINKLOCAL
) {
909 if (!addr
->v6
.sin6_scope_id
)
912 dev
= dev_get_by_index_rcu(sock_net(&opt
->inet
.sk
),
913 addr
->v6
.sin6_scope_id
);
924 /* Fill in Supported Address Type information for INIT and INIT-ACK
925 * chunks. Note: In the future, we may want to look at sock options
926 * to determine whether a PF_INET6 socket really wants to have IPV4
928 * Returns number of addresses supported.
930 static int sctp_inet6_supported_addrs(const struct sctp_sock
*opt
,
933 types
[0] = SCTP_PARAM_IPV6_ADDRESS
;
934 if (!opt
|| !ipv6_only_sock(sctp_opt2sk(opt
))) {
935 types
[1] = SCTP_PARAM_IPV4_ADDRESS
;
941 /* Handle SCTP_I_WANT_MAPPED_V4_ADDR for getpeername() and getsockname() */
942 static int sctp_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
943 int *uaddr_len
, int peer
)
947 rc
= inet6_getname(sock
, uaddr
, uaddr_len
, peer
);
952 *uaddr_len
= sctp_v6_addr_to_user(sctp_sk(sock
->sk
),
953 (union sctp_addr
*)uaddr
);
958 static const struct proto_ops inet6_seqpacket_ops
= {
960 .owner
= THIS_MODULE
,
961 .release
= inet6_release
,
963 .connect
= inet_dgram_connect
,
964 .socketpair
= sock_no_socketpair
,
965 .accept
= inet_accept
,
966 .getname
= sctp_getname
,
968 .ioctl
= inet6_ioctl
,
969 .listen
= sctp_inet_listen
,
970 .shutdown
= inet_shutdown
,
971 .setsockopt
= sock_common_setsockopt
,
972 .getsockopt
= sock_common_getsockopt
,
973 .sendmsg
= inet_sendmsg
,
974 .recvmsg
= inet_recvmsg
,
975 .mmap
= sock_no_mmap
,
977 .compat_setsockopt
= compat_sock_common_setsockopt
,
978 .compat_getsockopt
= compat_sock_common_getsockopt
,
982 static struct inet_protosw sctpv6_seqpacket_protosw
= {
983 .type
= SOCK_SEQPACKET
,
984 .protocol
= IPPROTO_SCTP
,
985 .prot
= &sctpv6_prot
,
986 .ops
= &inet6_seqpacket_ops
,
987 .flags
= SCTP_PROTOSW_FLAG
989 static struct inet_protosw sctpv6_stream_protosw
= {
991 .protocol
= IPPROTO_SCTP
,
992 .prot
= &sctpv6_prot
,
993 .ops
= &inet6_seqpacket_ops
,
994 .flags
= SCTP_PROTOSW_FLAG
,
997 static int sctp6_rcv(struct sk_buff
*skb
)
999 return sctp_rcv(skb
) ? -1 : 0;
1002 static const struct inet6_protocol sctpv6_protocol
= {
1003 .handler
= sctp6_rcv
,
1004 .err_handler
= sctp_v6_err
,
1005 .flags
= INET6_PROTO_NOPOLICY
| INET6_PROTO_FINAL
,
1008 static struct sctp_af sctp_af_inet6
= {
1009 .sa_family
= AF_INET6
,
1010 .sctp_xmit
= sctp_v6_xmit
,
1011 .setsockopt
= ipv6_setsockopt
,
1012 .getsockopt
= ipv6_getsockopt
,
1013 .get_dst
= sctp_v6_get_dst
,
1014 .get_saddr
= sctp_v6_get_saddr
,
1015 .copy_addrlist
= sctp_v6_copy_addrlist
,
1016 .from_skb
= sctp_v6_from_skb
,
1017 .from_sk
= sctp_v6_from_sk
,
1018 .from_addr_param
= sctp_v6_from_addr_param
,
1019 .to_addr_param
= sctp_v6_to_addr_param
,
1020 .cmp_addr
= sctp_v6_cmp_addr
,
1021 .scope
= sctp_v6_scope
,
1022 .addr_valid
= sctp_v6_addr_valid
,
1023 .inaddr_any
= sctp_v6_inaddr_any
,
1024 .is_any
= sctp_v6_is_any
,
1025 .available
= sctp_v6_available
,
1026 .skb_iif
= sctp_v6_skb_iif
,
1027 .is_ce
= sctp_v6_is_ce
,
1028 .seq_dump_addr
= sctp_v6_seq_dump_addr
,
1029 .ecn_capable
= sctp_v6_ecn_capable
,
1030 .net_header_len
= sizeof(struct ipv6hdr
),
1031 .sockaddr_len
= sizeof(struct sockaddr_in6
),
1032 #ifdef CONFIG_COMPAT
1033 .compat_setsockopt
= compat_ipv6_setsockopt
,
1034 .compat_getsockopt
= compat_ipv6_getsockopt
,
1038 static struct sctp_pf sctp_pf_inet6
= {
1039 .event_msgname
= sctp_inet6_event_msgname
,
1040 .skb_msgname
= sctp_inet6_skb_msgname
,
1041 .af_supported
= sctp_inet6_af_supported
,
1042 .cmp_addr
= sctp_inet6_cmp_addr
,
1043 .bind_verify
= sctp_inet6_bind_verify
,
1044 .send_verify
= sctp_inet6_send_verify
,
1045 .supported_addrs
= sctp_inet6_supported_addrs
,
1046 .create_accept_sk
= sctp_v6_create_accept_sk
,
1047 .addr_to_user
= sctp_v6_addr_to_user
,
1048 .to_sk_saddr
= sctp_v6_to_sk_saddr
,
1049 .to_sk_daddr
= sctp_v6_to_sk_daddr
,
1050 .af
= &sctp_af_inet6
,
1053 /* Initialize IPv6 support and register with socket layer. */
1054 void sctp_v6_pf_init(void)
1056 /* Register the SCTP specific PF_INET6 functions. */
1057 sctp_register_pf(&sctp_pf_inet6
, PF_INET6
);
1059 /* Register the SCTP specific AF_INET6 functions. */
1060 sctp_register_af(&sctp_af_inet6
);
1063 void sctp_v6_pf_exit(void)
1065 list_del(&sctp_af_inet6
.list
);
1068 /* Initialize IPv6 support and register with socket layer. */
1069 int sctp_v6_protosw_init(void)
1073 rc
= proto_register(&sctpv6_prot
, 1);
1077 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1078 inet6_register_protosw(&sctpv6_seqpacket_protosw
);
1079 inet6_register_protosw(&sctpv6_stream_protosw
);
1084 void sctp_v6_protosw_exit(void)
1086 inet6_unregister_protosw(&sctpv6_seqpacket_protosw
);
1087 inet6_unregister_protosw(&sctpv6_stream_protosw
);
1088 proto_unregister(&sctpv6_prot
);
1092 /* Register with inet6 layer. */
1093 int sctp_v6_add_protocol(void)
1095 /* Register notifier for inet6 address additions/deletions. */
1096 register_inet6addr_notifier(&sctp_inet6addr_notifier
);
1098 if (inet6_add_protocol(&sctpv6_protocol
, IPPROTO_SCTP
) < 0)
1104 /* Unregister with inet6 layer. */
1105 void sctp_v6_del_protocol(void)
1107 inet6_del_protocol(&sctpv6_protocol
, IPPROTO_SCTP
);
1108 unregister_inet6addr_notifier(&sctp_inet6addr_notifier
);