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 (addr
->a
.sa
.sa_family
== AF_INET6
&&
114 ipv6_addr_equal(&addr
->a
.v6
.sin6_addr
,
118 list_del_rcu(&addr
->list
);
122 spin_unlock_bh(&sctp_local_addr_lock
);
124 call_rcu(&addr
->rcu
, sctp_local_addr_free
);
131 static struct notifier_block sctp_inet6addr_notifier
= {
132 .notifier_call
= sctp_inet6addr_event
,
135 /* ICMP error handler. */
136 SCTP_STATIC
void sctp_v6_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
137 int type
, int code
, int offset
, __be32 info
)
139 struct inet6_dev
*idev
;
141 struct sctp_association
*asoc
;
142 struct sctp_transport
*transport
;
143 struct ipv6_pinfo
*np
;
144 sk_buff_data_t saveip
, savesctp
;
147 idev
= in6_dev_get(skb
->dev
);
149 /* Fix up skb to look at the embedded net header. */
150 saveip
= skb
->network_header
;
151 savesctp
= skb
->transport_header
;
152 skb_reset_network_header(skb
);
153 skb_set_transport_header(skb
, offset
);
154 sk
= sctp_err_lookup(AF_INET6
, skb
, sctp_hdr(skb
), &asoc
, &transport
);
155 /* Put back, the original pointers. */
156 skb
->network_header
= saveip
;
157 skb
->transport_header
= savesctp
;
159 ICMP6_INC_STATS_BH(idev
, ICMP6_MIB_INERRORS
);
163 /* Warning: The sock lock is held. Remember to call
168 case ICMPV6_PKT_TOOBIG
:
169 sctp_icmp_frag_needed(sk
, asoc
, transport
, ntohl(info
));
171 case ICMPV6_PARAMPROB
:
172 if (ICMPV6_UNK_NEXTHDR
== code
) {
173 sctp_icmp_proto_unreachable(sk
, asoc
, transport
);
182 icmpv6_err_convert(type
, code
, &err
);
183 if (!sock_owned_by_user(sk
) && np
->recverr
) {
185 sk
->sk_error_report(sk
);
186 } else { /* Only an error on timeout */
187 sk
->sk_err_soft
= err
;
191 sctp_err_finish(sk
, asoc
);
193 if (likely(idev
!= NULL
))
197 /* Based on tcp_v6_xmit() in tcp_ipv6.c. */
198 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 if (!(transport
->param_flags
& SPP_PMTUD_ENABLE
))
236 return ip6_xmit(sk
, skb
, &fl
, np
->opt
, 0);
239 /* Returns the dst cache entry for the given source and destination ip
242 static struct dst_entry
*sctp_v6_get_dst(struct sctp_association
*asoc
,
243 union sctp_addr
*daddr
,
244 union sctp_addr
*saddr
)
246 struct dst_entry
*dst
;
249 memset(&fl
, 0, sizeof(fl
));
250 ipv6_addr_copy(&fl
.fl6_dst
, &daddr
->v6
.sin6_addr
);
251 if (ipv6_addr_type(&daddr
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
252 fl
.oif
= daddr
->v6
.sin6_scope_id
;
255 SCTP_DEBUG_PRINTK("%s: DST=" NIP6_FMT
" ",
256 __func__
, NIP6(fl
.fl6_dst
));
259 ipv6_addr_copy(&fl
.fl6_src
, &saddr
->v6
.sin6_addr
);
261 "SRC=" NIP6_FMT
" - ",
265 dst
= ip6_route_output(&init_net
, NULL
, &fl
);
268 rt
= (struct rt6_info
*)dst
;
270 "rt6_dst:" NIP6_FMT
" rt6_src:" NIP6_FMT
"\n",
271 NIP6(rt
->rt6i_dst
.addr
), NIP6(rt
->rt6i_src
.addr
));
274 SCTP_DEBUG_PRINTK("NO ROUTE\n");
279 /* Returns the number of consecutive initial bits that match in the 2 ipv6
282 static inline int sctp_v6_addr_match_len(union sctp_addr
*s1
,
285 struct in6_addr
*a1
= &s1
->v6
.sin6_addr
;
286 struct in6_addr
*a2
= &s2
->v6
.sin6_addr
;
289 for (i
= 0; i
< 4 ; i
++) {
292 a1xora2
= a1
->s6_addr32
[i
] ^ a2
->s6_addr32
[i
];
294 if ((j
= fls(ntohl(a1xora2
))))
295 return (i
* 32 + 32 - j
);
301 /* Fills in the source address(saddr) based on the destination address(daddr)
302 * and asoc's bind address list.
304 static void sctp_v6_get_saddr(struct sctp_sock
*sk
,
305 struct sctp_association
*asoc
,
306 struct dst_entry
*dst
,
307 union sctp_addr
*daddr
,
308 union sctp_addr
*saddr
)
310 struct sctp_bind_addr
*bp
;
311 struct sctp_sockaddr_entry
*laddr
;
313 union sctp_addr
*baddr
= NULL
;
317 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
318 "daddr:" NIP6_FMT
" ",
319 __func__
, asoc
, dst
, NIP6(daddr
->v6
.sin6_addr
));
322 ipv6_dev_get_saddr(dst
? ip6_dst_idev(dst
)->dev
: NULL
,
323 &daddr
->v6
.sin6_addr
,
324 inet6_sk(&sk
->inet
.sk
)->srcprefs
,
325 &saddr
->v6
.sin6_addr
);
326 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT
"\n",
327 NIP6(saddr
->v6
.sin6_addr
));
331 scope
= sctp_scope(daddr
);
333 bp
= &asoc
->base
.bind_addr
;
335 /* Go through the bind address list and find the best source address
336 * that matches the scope of the destination address.
339 list_for_each_entry_rcu(laddr
, &bp
->address_list
, list
) {
342 if ((laddr
->state
== SCTP_ADDR_SRC
) &&
343 (laddr
->a
.sa
.sa_family
== AF_INET6
) &&
344 (scope
<= sctp_scope(&laddr
->a
))) {
345 bmatchlen
= sctp_v6_addr_match_len(daddr
, &laddr
->a
);
346 if (!baddr
|| (matchlen
< bmatchlen
)) {
348 matchlen
= bmatchlen
;
354 memcpy(saddr
, baddr
, sizeof(union sctp_addr
));
355 SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT
"\n",
356 NIP6(saddr
->v6
.sin6_addr
));
358 printk(KERN_ERR
"%s: asoc:%p Could not find a valid source "
359 "address for the dest:" NIP6_FMT
"\n",
360 __func__
, asoc
, NIP6(daddr
->v6
.sin6_addr
));
366 /* Make a copy of all potential local addresses. */
367 static void sctp_v6_copy_addrlist(struct list_head
*addrlist
,
368 struct net_device
*dev
)
370 struct inet6_dev
*in6_dev
;
371 struct inet6_ifaddr
*ifp
;
372 struct sctp_sockaddr_entry
*addr
;
375 if ((in6_dev
= __in6_dev_get(dev
)) == NULL
) {
380 read_lock_bh(&in6_dev
->lock
);
381 for (ifp
= in6_dev
->addr_list
; ifp
; ifp
= ifp
->if_next
) {
382 /* Add the address to the local list. */
383 addr
= t_new(struct sctp_sockaddr_entry
, GFP_ATOMIC
);
385 addr
->a
.v6
.sin6_family
= AF_INET6
;
386 addr
->a
.v6
.sin6_port
= 0;
387 addr
->a
.v6
.sin6_addr
= ifp
->addr
;
388 addr
->a
.v6
.sin6_scope_id
= dev
->ifindex
;
390 INIT_LIST_HEAD(&addr
->list
);
391 INIT_RCU_HEAD(&addr
->rcu
);
392 list_add_tail(&addr
->list
, addrlist
);
396 read_unlock_bh(&in6_dev
->lock
);
400 /* Initialize a sockaddr_storage from in incoming skb. */
401 static void sctp_v6_from_skb(union sctp_addr
*addr
,struct sk_buff
*skb
,
408 port
= &addr
->v6
.sin6_port
;
409 addr
->v6
.sin6_family
= AF_INET6
;
410 addr
->v6
.sin6_flowinfo
= 0; /* FIXME */
411 addr
->v6
.sin6_scope_id
= ((struct inet6_skb_parm
*)skb
->cb
)->iif
;
416 from
= &ipv6_hdr(skb
)->saddr
;
419 from
= &ipv6_hdr(skb
)->daddr
;
421 ipv6_addr_copy(&addr
->v6
.sin6_addr
, from
);
424 /* Initialize an sctp_addr from a socket. */
425 static void sctp_v6_from_sk(union sctp_addr
*addr
, struct sock
*sk
)
427 addr
->v6
.sin6_family
= AF_INET6
;
428 addr
->v6
.sin6_port
= 0;
429 addr
->v6
.sin6_addr
= inet6_sk(sk
)->rcv_saddr
;
432 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
433 static void sctp_v6_to_sk_saddr(union sctp_addr
*addr
, struct sock
*sk
)
435 if (addr
->sa
.sa_family
== AF_INET
&& sctp_sk(sk
)->v4mapped
) {
436 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[0] = 0;
437 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[1] = 0;
438 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[2] = htonl(0x0000ffff);
439 inet6_sk(sk
)->rcv_saddr
.s6_addr32
[3] =
440 addr
->v4
.sin_addr
.s_addr
;
442 inet6_sk(sk
)->rcv_saddr
= addr
->v6
.sin6_addr
;
446 /* Initialize sk->sk_daddr from sctp_addr. */
447 static void sctp_v6_to_sk_daddr(union sctp_addr
*addr
, struct sock
*sk
)
449 if (addr
->sa
.sa_family
== AF_INET
&& sctp_sk(sk
)->v4mapped
) {
450 inet6_sk(sk
)->daddr
.s6_addr32
[0] = 0;
451 inet6_sk(sk
)->daddr
.s6_addr32
[1] = 0;
452 inet6_sk(sk
)->daddr
.s6_addr32
[2] = htonl(0x0000ffff);
453 inet6_sk(sk
)->daddr
.s6_addr32
[3] = addr
->v4
.sin_addr
.s_addr
;
455 inet6_sk(sk
)->daddr
= addr
->v6
.sin6_addr
;
459 /* Initialize a sctp_addr from an address parameter. */
460 static void sctp_v6_from_addr_param(union sctp_addr
*addr
,
461 union sctp_addr_param
*param
,
462 __be16 port
, int iif
)
464 addr
->v6
.sin6_family
= AF_INET6
;
465 addr
->v6
.sin6_port
= port
;
466 addr
->v6
.sin6_flowinfo
= 0; /* BUG */
467 ipv6_addr_copy(&addr
->v6
.sin6_addr
, ¶m
->v6
.addr
);
468 addr
->v6
.sin6_scope_id
= iif
;
471 /* Initialize an address parameter from a sctp_addr and return the length
472 * of the address parameter.
474 static int sctp_v6_to_addr_param(const union sctp_addr
*addr
,
475 union sctp_addr_param
*param
)
477 int length
= sizeof(sctp_ipv6addr_param_t
);
479 param
->v6
.param_hdr
.type
= SCTP_PARAM_IPV6_ADDRESS
;
480 param
->v6
.param_hdr
.length
= htons(length
);
481 ipv6_addr_copy(¶m
->v6
.addr
, &addr
->v6
.sin6_addr
);
486 /* Initialize a sctp_addr from a dst_entry. */
487 static void sctp_v6_dst_saddr(union sctp_addr
*addr
, struct dst_entry
*dst
,
490 struct rt6_info
*rt
= (struct rt6_info
*)dst
;
491 addr
->sa
.sa_family
= AF_INET6
;
492 addr
->v6
.sin6_port
= port
;
493 ipv6_addr_copy(&addr
->v6
.sin6_addr
, &rt
->rt6i_src
.addr
);
496 /* Compare addresses exactly.
497 * v4-mapped-v6 is also in consideration.
499 static int sctp_v6_cmp_addr(const union sctp_addr
*addr1
,
500 const union sctp_addr
*addr2
)
502 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
) {
503 if (addr1
->sa
.sa_family
== AF_INET
&&
504 addr2
->sa
.sa_family
== AF_INET6
&&
505 ipv6_addr_v4mapped(&addr2
->v6
.sin6_addr
)) {
506 if (addr2
->v6
.sin6_port
== addr1
->v4
.sin_port
&&
507 addr2
->v6
.sin6_addr
.s6_addr32
[3] ==
508 addr1
->v4
.sin_addr
.s_addr
)
511 if (addr2
->sa
.sa_family
== AF_INET
&&
512 addr1
->sa
.sa_family
== AF_INET6
&&
513 ipv6_addr_v4mapped(&addr1
->v6
.sin6_addr
)) {
514 if (addr1
->v6
.sin6_port
== addr2
->v4
.sin_port
&&
515 addr1
->v6
.sin6_addr
.s6_addr32
[3] ==
516 addr2
->v4
.sin_addr
.s_addr
)
521 if (!ipv6_addr_equal(&addr1
->v6
.sin6_addr
, &addr2
->v6
.sin6_addr
))
523 /* If this is a linklocal address, compare the scope_id. */
524 if (ipv6_addr_type(&addr1
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
) {
525 if (addr1
->v6
.sin6_scope_id
&& addr2
->v6
.sin6_scope_id
&&
526 (addr1
->v6
.sin6_scope_id
!= addr2
->v6
.sin6_scope_id
)) {
534 /* Initialize addr struct to INADDR_ANY. */
535 static void sctp_v6_inaddr_any(union sctp_addr
*addr
, __be16 port
)
537 memset(addr
, 0x00, sizeof(union sctp_addr
));
538 addr
->v6
.sin6_family
= AF_INET6
;
539 addr
->v6
.sin6_port
= port
;
542 /* Is this a wildcard address? */
543 static int sctp_v6_is_any(const union sctp_addr
*addr
)
545 return ipv6_addr_any(&addr
->v6
.sin6_addr
);
548 /* Should this be available for binding? */
549 static int sctp_v6_available(union sctp_addr
*addr
, struct sctp_sock
*sp
)
552 struct in6_addr
*in6
= (struct in6_addr
*)&addr
->v6
.sin6_addr
;
554 type
= ipv6_addr_type(in6
);
555 if (IPV6_ADDR_ANY
== type
)
557 if (type
== IPV6_ADDR_MAPPED
) {
558 if (sp
&& !sp
->v4mapped
)
560 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
562 sctp_v6_map_v4(addr
);
563 return sctp_get_af_specific(AF_INET
)->available(addr
, sp
);
565 if (!(type
& IPV6_ADDR_UNICAST
))
568 return ipv6_chk_addr(&init_net
, in6
, NULL
, 0);
571 /* This function checks if the address is a valid address to be used for
575 * Return 0 - If the address is a non-unicast or an illegal address.
576 * Return 1 - If the address is a unicast.
578 static int sctp_v6_addr_valid(union sctp_addr
*addr
,
579 struct sctp_sock
*sp
,
580 const struct sk_buff
*skb
)
582 int ret
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
584 /* Support v4-mapped-v6 address. */
585 if (ret
== IPV6_ADDR_MAPPED
) {
586 /* Note: This routine is used in input, so v4-mapped-v6
587 * are disallowed here when there is no sctp_sock.
589 if (!sp
|| !sp
->v4mapped
)
591 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
593 sctp_v6_map_v4(addr
);
594 return sctp_get_af_specific(AF_INET
)->addr_valid(addr
, sp
, skb
);
597 /* Is this a non-unicast address */
598 if (!(ret
& IPV6_ADDR_UNICAST
))
604 /* What is the scope of 'addr'? */
605 static sctp_scope_t
sctp_v6_scope(union sctp_addr
*addr
)
610 /* The IPv6 scope is really a set of bit fields.
611 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
614 v6scope
= ipv6_addr_scope(&addr
->v6
.sin6_addr
);
617 retval
= SCTP_SCOPE_LOOPBACK
;
620 retval
= SCTP_SCOPE_LINK
;
623 retval
= SCTP_SCOPE_PRIVATE
;
626 retval
= SCTP_SCOPE_GLOBAL
;
633 /* Create and initialize a new sk for the socket to be returned by accept(). */
634 static struct sock
*sctp_v6_create_accept_sk(struct sock
*sk
,
635 struct sctp_association
*asoc
)
637 struct inet_sock
*inet
= inet_sk(sk
);
639 struct inet_sock
*newinet
;
640 struct ipv6_pinfo
*newnp
, *np
= inet6_sk(sk
);
641 struct sctp6_sock
*newsctp6sk
;
643 newsk
= sk_alloc(sock_net(sk
), PF_INET6
, GFP_KERNEL
, sk
->sk_prot
);
647 sock_init_data(NULL
, newsk
);
649 newsk
->sk_type
= SOCK_STREAM
;
651 newsk
->sk_prot
= sk
->sk_prot
;
652 newsk
->sk_no_check
= sk
->sk_no_check
;
653 newsk
->sk_reuse
= sk
->sk_reuse
;
655 newsk
->sk_destruct
= inet_sock_destruct
;
656 newsk
->sk_family
= PF_INET6
;
657 newsk
->sk_protocol
= IPPROTO_SCTP
;
658 newsk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
659 newsk
->sk_shutdown
= sk
->sk_shutdown
;
660 sock_reset_flag(sk
, SOCK_ZAPPED
);
662 newsctp6sk
= (struct sctp6_sock
*)newsk
;
663 inet_sk(newsk
)->pinet6
= &newsctp6sk
->inet6
;
665 sctp_sk(newsk
)->v4mapped
= sctp_sk(sk
)->v4mapped
;
667 newinet
= inet_sk(newsk
);
668 newnp
= inet6_sk(newsk
);
670 memcpy(newnp
, np
, sizeof(struct ipv6_pinfo
));
672 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
675 newinet
->sport
= inet
->sport
;
676 newnp
->saddr
= np
->saddr
;
677 newnp
->rcv_saddr
= np
->rcv_saddr
;
678 newinet
->dport
= htons(asoc
->peer
.port
);
679 sctp_v6_to_sk_daddr(&asoc
->peer
.primary_addr
, newsk
);
681 /* Init the ipv4 part of the socket since we can have sockets
682 * using v6 API for ipv4.
684 newinet
->uc_ttl
= -1;
685 newinet
->mc_loop
= 1;
687 newinet
->mc_index
= 0;
688 newinet
->mc_list
= NULL
;
690 if (ipv4_config
.no_pmtu_disc
)
691 newinet
->pmtudisc
= IP_PMTUDISC_DONT
;
693 newinet
->pmtudisc
= IP_PMTUDISC_WANT
;
695 sk_refcnt_debug_inc(newsk
);
697 if (newsk
->sk_prot
->init(newsk
)) {
698 sk_common_release(newsk
);
706 /* Map v4 address to mapped v6 address */
707 static void sctp_v6_addr_v4map(struct sctp_sock
*sp
, union sctp_addr
*addr
)
709 if (sp
->v4mapped
&& AF_INET
== addr
->sa
.sa_family
)
710 sctp_v4_map_v6(addr
);
713 /* Where did this skb come from? */
714 static int sctp_v6_skb_iif(const struct sk_buff
*skb
)
716 struct inet6_skb_parm
*opt
= (struct inet6_skb_parm
*) skb
->cb
;
720 /* Was this packet marked by Explicit Congestion Notification? */
721 static int sctp_v6_is_ce(const struct sk_buff
*skb
)
723 return *((__u32
*)(ipv6_hdr(skb
))) & htonl(1 << 20);
726 /* Dump the v6 addr to the seq file. */
727 static void sctp_v6_seq_dump_addr(struct seq_file
*seq
, union sctp_addr
*addr
)
729 seq_printf(seq
, NIP6_FMT
" ", NIP6(addr
->v6
.sin6_addr
));
732 static void sctp_v6_ecn_capable(struct sock
*sk
)
734 inet6_sk(sk
)->tclass
|= INET_ECN_ECT_0
;
737 /* Initialize a PF_INET6 socket msg_name. */
738 static void sctp_inet6_msgname(char *msgname
, int *addr_len
)
740 struct sockaddr_in6
*sin6
;
742 sin6
= (struct sockaddr_in6
*)msgname
;
743 sin6
->sin6_family
= AF_INET6
;
744 sin6
->sin6_flowinfo
= 0;
745 sin6
->sin6_scope_id
= 0; /*FIXME */
746 *addr_len
= sizeof(struct sockaddr_in6
);
749 /* Initialize a PF_INET msgname from a ulpevent. */
750 static void sctp_inet6_event_msgname(struct sctp_ulpevent
*event
,
751 char *msgname
, int *addrlen
)
753 struct sockaddr_in6
*sin6
, *sin6from
;
756 union sctp_addr
*addr
;
757 struct sctp_association
*asoc
;
760 sctp_inet6_msgname(msgname
, addrlen
);
761 sin6
= (struct sockaddr_in6
*)msgname
;
762 sin6
->sin6_port
= htons(asoc
->peer
.port
);
763 addr
= &asoc
->peer
.primary_addr
;
765 /* Note: If we go to a common v6 format, this code
769 /* Map ipv4 address into v4-mapped-on-v6 address. */
770 if (sctp_sk(asoc
->base
.sk
)->v4mapped
&&
771 AF_INET
== addr
->sa
.sa_family
) {
772 sctp_v4_map_v6((union sctp_addr
*)sin6
);
773 sin6
->sin6_addr
.s6_addr32
[3] =
774 addr
->v4
.sin_addr
.s_addr
;
778 sin6from
= &asoc
->peer
.primary_addr
.v6
;
779 ipv6_addr_copy(&sin6
->sin6_addr
, &sin6from
->sin6_addr
);
780 if (ipv6_addr_type(&sin6
->sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
781 sin6
->sin6_scope_id
= sin6from
->sin6_scope_id
;
785 /* Initialize a msg_name from an inbound skb. */
786 static void sctp_inet6_skb_msgname(struct sk_buff
*skb
, char *msgname
,
790 struct sockaddr_in6
*sin6
;
793 sctp_inet6_msgname(msgname
, addr_len
);
794 sin6
= (struct sockaddr_in6
*)msgname
;
796 sin6
->sin6_port
= sh
->source
;
798 /* Map ipv4 address into v4-mapped-on-v6 address. */
799 if (sctp_sk(skb
->sk
)->v4mapped
&&
800 ip_hdr(skb
)->version
== 4) {
801 sctp_v4_map_v6((union sctp_addr
*)sin6
);
802 sin6
->sin6_addr
.s6_addr32
[3] = ip_hdr(skb
)->saddr
;
806 /* Otherwise, just copy the v6 address. */
807 ipv6_addr_copy(&sin6
->sin6_addr
, &ipv6_hdr(skb
)->saddr
);
808 if (ipv6_addr_type(&sin6
->sin6_addr
) & IPV6_ADDR_LINKLOCAL
) {
809 struct sctp_ulpevent
*ev
= sctp_skb2event(skb
);
810 sin6
->sin6_scope_id
= ev
->iif
;
815 /* Do we support this AF? */
816 static int sctp_inet6_af_supported(sa_family_t family
, struct sctp_sock
*sp
)
821 /* v4-mapped-v6 addresses */
823 if (!__ipv6_only_sock(sctp_opt2sk(sp
)))
830 /* Address matching with wildcards allowed. This extra level
831 * of indirection lets us choose whether a PF_INET6 should
832 * disallow any v4 addresses if we so choose.
834 static int sctp_inet6_cmp_addr(const union sctp_addr
*addr1
,
835 const union sctp_addr
*addr2
,
836 struct sctp_sock
*opt
)
838 struct sctp_af
*af1
, *af2
;
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(sctp_opt2sk(opt
)) && af1
!= af2
)
850 /* Today, wildcard AF_INET/AF_INET6. */
851 if (sctp_is_any(addr1
) || sctp_is_any(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
) {
875 if (!addr
->v6
.sin6_scope_id
)
877 dev
= dev_get_by_index(&init_net
, addr
->v6
.sin6_scope_id
);
880 if (!ipv6_chk_addr(&init_net
, &addr
->v6
.sin6_addr
,
886 } else if (type
== IPV6_ADDR_MAPPED
) {
893 return af
->available(addr
, opt
);
896 /* Verify that the provided sockaddr looks sendable. Common verification,
897 * has already been taken care of.
899 static int sctp_inet6_send_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
901 struct sctp_af
*af
= NULL
;
903 /* ASSERT: address family has already been verified. */
904 if (addr
->sa
.sa_family
!= AF_INET6
)
905 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
907 int type
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
908 struct net_device
*dev
;
910 if (type
& IPV6_ADDR_LINKLOCAL
) {
911 if (!addr
->v6
.sin6_scope_id
)
913 dev
= dev_get_by_index(&init_net
, 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 static const struct proto_ops inet6_seqpacket_ops
= {
943 .owner
= THIS_MODULE
,
944 .release
= inet6_release
,
946 .connect
= inet_dgram_connect
,
947 .socketpair
= sock_no_socketpair
,
948 .accept
= inet_accept
,
949 .getname
= inet6_getname
,
951 .ioctl
= inet6_ioctl
,
952 .listen
= sctp_inet_listen
,
953 .shutdown
= inet_shutdown
,
954 .setsockopt
= sock_common_setsockopt
,
955 .getsockopt
= sock_common_getsockopt
,
956 .sendmsg
= inet_sendmsg
,
957 .recvmsg
= sock_common_recvmsg
,
958 .mmap
= sock_no_mmap
,
960 .compat_setsockopt
= compat_sock_common_setsockopt
,
961 .compat_getsockopt
= compat_sock_common_getsockopt
,
965 static struct inet_protosw sctpv6_seqpacket_protosw
= {
966 .type
= SOCK_SEQPACKET
,
967 .protocol
= IPPROTO_SCTP
,
968 .prot
= &sctpv6_prot
,
969 .ops
= &inet6_seqpacket_ops
,
972 .flags
= SCTP_PROTOSW_FLAG
974 static struct inet_protosw sctpv6_stream_protosw
= {
976 .protocol
= IPPROTO_SCTP
,
977 .prot
= &sctpv6_prot
,
978 .ops
= &inet6_seqpacket_ops
,
981 .flags
= SCTP_PROTOSW_FLAG
,
984 static int sctp6_rcv(struct sk_buff
*skb
)
986 return sctp_rcv(skb
) ? -1 : 0;
989 static struct inet6_protocol sctpv6_protocol
= {
990 .handler
= sctp6_rcv
,
991 .err_handler
= sctp_v6_err
,
992 .flags
= INET6_PROTO_NOPOLICY
| INET6_PROTO_FINAL
,
995 static struct sctp_af sctp_af_inet6
= {
996 .sa_family
= AF_INET6
,
997 .sctp_xmit
= sctp_v6_xmit
,
998 .setsockopt
= ipv6_setsockopt
,
999 .getsockopt
= ipv6_getsockopt
,
1000 .get_dst
= sctp_v6_get_dst
,
1001 .get_saddr
= sctp_v6_get_saddr
,
1002 .copy_addrlist
= sctp_v6_copy_addrlist
,
1003 .from_skb
= sctp_v6_from_skb
,
1004 .from_sk
= sctp_v6_from_sk
,
1005 .to_sk_saddr
= sctp_v6_to_sk_saddr
,
1006 .to_sk_daddr
= sctp_v6_to_sk_daddr
,
1007 .from_addr_param
= sctp_v6_from_addr_param
,
1008 .to_addr_param
= sctp_v6_to_addr_param
,
1009 .dst_saddr
= sctp_v6_dst_saddr
,
1010 .cmp_addr
= sctp_v6_cmp_addr
,
1011 .scope
= sctp_v6_scope
,
1012 .addr_valid
= sctp_v6_addr_valid
,
1013 .inaddr_any
= sctp_v6_inaddr_any
,
1014 .is_any
= sctp_v6_is_any
,
1015 .available
= sctp_v6_available
,
1016 .skb_iif
= sctp_v6_skb_iif
,
1017 .is_ce
= sctp_v6_is_ce
,
1018 .seq_dump_addr
= sctp_v6_seq_dump_addr
,
1019 .ecn_capable
= sctp_v6_ecn_capable
,
1020 .net_header_len
= sizeof(struct ipv6hdr
),
1021 .sockaddr_len
= sizeof(struct sockaddr_in6
),
1022 #ifdef CONFIG_COMPAT
1023 .compat_setsockopt
= compat_ipv6_setsockopt
,
1024 .compat_getsockopt
= compat_ipv6_getsockopt
,
1028 static struct sctp_pf sctp_pf_inet6
= {
1029 .event_msgname
= sctp_inet6_event_msgname
,
1030 .skb_msgname
= sctp_inet6_skb_msgname
,
1031 .af_supported
= sctp_inet6_af_supported
,
1032 .cmp_addr
= sctp_inet6_cmp_addr
,
1033 .bind_verify
= sctp_inet6_bind_verify
,
1034 .send_verify
= sctp_inet6_send_verify
,
1035 .supported_addrs
= sctp_inet6_supported_addrs
,
1036 .create_accept_sk
= sctp_v6_create_accept_sk
,
1037 .addr_v4map
= sctp_v6_addr_v4map
,
1038 .af
= &sctp_af_inet6
,
1041 /* Initialize IPv6 support and register with socket layer. */
1042 void sctp_v6_pf_init(void)
1044 /* Register the SCTP specific PF_INET6 functions. */
1045 sctp_register_pf(&sctp_pf_inet6
, PF_INET6
);
1047 /* Register the SCTP specific AF_INET6 functions. */
1048 sctp_register_af(&sctp_af_inet6
);
1051 void sctp_v6_pf_exit(void)
1053 list_del(&sctp_af_inet6
.list
);
1056 /* Initialize IPv6 support and register with socket layer. */
1057 int sctp_v6_protosw_init(void)
1061 rc
= proto_register(&sctpv6_prot
, 1);
1065 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1066 inet6_register_protosw(&sctpv6_seqpacket_protosw
);
1067 inet6_register_protosw(&sctpv6_stream_protosw
);
1072 void sctp_v6_protosw_exit(void)
1074 inet6_unregister_protosw(&sctpv6_seqpacket_protosw
);
1075 inet6_unregister_protosw(&sctpv6_stream_protosw
);
1076 proto_unregister(&sctpv6_prot
);
1080 /* Register with inet6 layer. */
1081 int sctp_v6_add_protocol(void)
1083 /* Register notifier for inet6 address additions/deletions. */
1084 register_inet6addr_notifier(&sctp_inet6addr_notifier
);
1086 if (inet6_add_protocol(&sctpv6_protocol
, IPPROTO_SCTP
) < 0)
1092 /* Unregister with inet6 layer. */
1093 void sctp_v6_del_protocol(void)
1095 inet6_del_protocol(&sctpv6_protocol
, IPPROTO_SCTP
);
1096 unregister_inet6addr_notifier(&sctp_inet6addr_notifier
);