1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* SCTP kernel implementation
3 * (C) Copyright IBM Corp. 2002, 2004
4 * Copyright (c) 2001 Nokia, Inc.
5 * Copyright (c) 2001 La Monte H.P. Yarroll
6 * Copyright (c) 2002-2003 Intel Corp.
8 * This file is part of the SCTP kernel implementation
12 * Please send any bug reports or fixes you make to the
14 * lksctp developers <linux-sctp@vger.kernel.org>
16 * Written or modified by:
17 * Le Yanqun <yanqun.le@nokia.com>
18 * Hui Huang <hui.huang@nokia.com>
19 * La Monte H.P. Yarroll <piggy@acm.org>
20 * Sridhar Samudrala <sri@us.ibm.com>
21 * Jon Grimm <jgrimm@us.ibm.com>
22 * Ardelle Fan <ardelle.fan@intel.com>
25 * linux/net/ipv6/tcp_ipv6.c
28 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
30 #include <linux/module.h>
31 #include <linux/errno.h>
32 #include <linux/types.h>
33 #include <linux/socket.h>
34 #include <linux/sockios.h>
35 #include <linux/net.h>
37 #include <linux/in6.h>
38 #include <linux/netdevice.h>
39 #include <linux/init.h>
40 #include <linux/ipsec.h>
41 #include <linux/slab.h>
43 #include <linux/ipv6.h>
44 #include <linux/icmpv6.h>
45 #include <linux/random.h>
46 #include <linux/seq_file.h>
48 #include <net/protocol.h>
49 #include <net/ndisc.h>
52 #include <net/transp_v6.h>
53 #include <net/addrconf.h>
54 #include <net/ip6_route.h>
55 #include <net/inet_common.h>
56 #include <net/inet_ecn.h>
57 #include <net/sctp/sctp.h>
58 #include <net/udp_tunnel.h>
60 #include <linux/uaccess.h>
62 static inline int sctp_v6_addr_match_len(union sctp_addr
*s1
,
64 static void sctp_v6_to_addr(union sctp_addr
*addr
, struct in6_addr
*saddr
,
66 static int sctp_v6_cmp_addr(const union sctp_addr
*addr1
,
67 const union sctp_addr
*addr2
);
69 /* Event handler for inet6 address addition/deletion events.
70 * The sctp_local_addr_list needs to be protocted by a spin lock since
71 * multiple notifiers (say IPv4 and IPv6) may be running at the same
72 * time and thus corrupt the list.
73 * The reader side is protected with RCU.
75 static int sctp_inet6addr_event(struct notifier_block
*this, unsigned long ev
,
78 struct inet6_ifaddr
*ifa
= (struct inet6_ifaddr
*)ptr
;
79 struct sctp_sockaddr_entry
*addr
= NULL
;
80 struct sctp_sockaddr_entry
*temp
;
81 struct net
*net
= dev_net(ifa
->idev
->dev
);
86 addr
= kzalloc(sizeof(*addr
), GFP_ATOMIC
);
88 addr
->a
.v6
.sin6_family
= AF_INET6
;
89 addr
->a
.v6
.sin6_addr
= ifa
->addr
;
90 addr
->a
.v6
.sin6_scope_id
= ifa
->idev
->dev
->ifindex
;
92 spin_lock_bh(&net
->sctp
.local_addr_lock
);
93 list_add_tail_rcu(&addr
->list
, &net
->sctp
.local_addr_list
);
94 sctp_addr_wq_mgmt(net
, addr
, SCTP_ADDR_NEW
);
95 spin_unlock_bh(&net
->sctp
.local_addr_lock
);
99 spin_lock_bh(&net
->sctp
.local_addr_lock
);
100 list_for_each_entry_safe(addr
, temp
,
101 &net
->sctp
.local_addr_list
, list
) {
102 if (addr
->a
.sa
.sa_family
== AF_INET6
&&
103 ipv6_addr_equal(&addr
->a
.v6
.sin6_addr
,
105 addr
->a
.v6
.sin6_scope_id
== ifa
->idev
->dev
->ifindex
) {
106 sctp_addr_wq_mgmt(net
, addr
, SCTP_ADDR_DEL
);
109 list_del_rcu(&addr
->list
);
113 spin_unlock_bh(&net
->sctp
.local_addr_lock
);
115 kfree_rcu(addr
, rcu
);
122 static struct notifier_block sctp_inet6addr_notifier
= {
123 .notifier_call
= sctp_inet6addr_event
,
126 static void sctp_v6_err_handle(struct sctp_transport
*t
, struct sk_buff
*skb
,
127 __u8 type
, __u8 code
, __u32 info
)
129 struct sctp_association
*asoc
= t
->asoc
;
130 struct sock
*sk
= asoc
->base
.sk
;
131 struct ipv6_pinfo
*np
;
135 case ICMPV6_PKT_TOOBIG
:
136 if (ip6_sk_accept_pmtu(sk
))
137 sctp_icmp_frag_needed(sk
, asoc
, t
, info
);
139 case ICMPV6_PARAMPROB
:
140 if (ICMPV6_UNK_NEXTHDR
== code
) {
141 sctp_icmp_proto_unreachable(sk
, asoc
, t
);
146 sctp_icmp_redirect(sk
, t
, skb
);
153 icmpv6_err_convert(type
, code
, &err
);
154 if (!sock_owned_by_user(sk
) && np
->recverr
) {
158 sk
->sk_err_soft
= err
;
162 /* ICMP error handler. */
163 static int sctp_v6_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
164 u8 type
, u8 code
, int offset
, __be32 info
)
166 struct net
*net
= dev_net(skb
->dev
);
167 struct sctp_transport
*transport
;
168 struct sctp_association
*asoc
;
169 __u16 saveip
, savesctp
;
172 /* Fix up skb to look at the embedded net header. */
173 saveip
= skb
->network_header
;
174 savesctp
= skb
->transport_header
;
175 skb_reset_network_header(skb
);
176 skb_set_transport_header(skb
, offset
);
177 sk
= sctp_err_lookup(net
, AF_INET6
, skb
, sctp_hdr(skb
), &asoc
, &transport
);
178 /* Put back, the original pointers. */
179 skb
->network_header
= saveip
;
180 skb
->transport_header
= savesctp
;
182 __ICMP6_INC_STATS(net
, __in6_dev_get(skb
->dev
), ICMP6_MIB_INERRORS
);
186 sctp_v6_err_handle(transport
, skb
, type
, code
, ntohl(info
));
187 sctp_err_finish(sk
, transport
);
192 int sctp_udp_v6_err(struct sock
*sk
, struct sk_buff
*skb
)
194 struct net
*net
= dev_net(skb
->dev
);
195 struct sctp_association
*asoc
;
196 struct sctp_transport
*t
;
197 struct icmp6hdr
*hdr
;
200 skb
->transport_header
+= sizeof(struct udphdr
);
201 sk
= sctp_err_lookup(net
, AF_INET6
, skb
, sctp_hdr(skb
), &asoc
, &t
);
203 __ICMP6_INC_STATS(net
, __in6_dev_get(skb
->dev
), ICMP6_MIB_INERRORS
);
207 skb
->transport_header
-= sizeof(struct udphdr
);
208 hdr
= (struct icmp6hdr
*)(skb_network_header(skb
) - sizeof(struct icmp6hdr
));
209 if (hdr
->icmp6_type
== NDISC_REDIRECT
) {
210 /* can't be handled without outer ip6hdr known, leave it to udpv6_err */
211 sctp_err_finish(sk
, t
);
214 if (hdr
->icmp6_type
== ICMPV6_PKT_TOOBIG
)
215 info
= ntohl(hdr
->icmp6_mtu
);
216 sctp_v6_err_handle(t
, skb
, hdr
->icmp6_type
, hdr
->icmp6_code
, info
);
218 sctp_err_finish(sk
, t
);
222 static int sctp_v6_xmit(struct sk_buff
*skb
, struct sctp_transport
*t
)
224 struct dst_entry
*dst
= dst_clone(t
->dst
);
225 struct flowi6
*fl6
= &t
->fl
.u
.ip6
;
226 struct sock
*sk
= skb
->sk
;
227 struct ipv6_pinfo
*np
= inet6_sk(sk
);
228 __u8 tclass
= np
->tclass
;
231 pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__
, skb
,
232 skb
->len
, &fl6
->saddr
, &fl6
->daddr
);
234 if (t
->dscp
& SCTP_DSCP_SET_MASK
)
235 tclass
= t
->dscp
& SCTP_DSCP_VAL_MASK
;
237 if (INET_ECN_is_capable(tclass
))
238 IP6_ECN_flow_xmit(sk
, fl6
->flowlabel
);
240 if (!(t
->param_flags
& SPP_PMTUD_ENABLE
))
243 SCTP_INC_STATS(sock_net(sk
), SCTP_MIB_OUTSCTPPACKS
);
245 if (!t
->encap_port
|| !sctp_sk(sk
)->udp_port
) {
248 skb_dst_set(skb
, dst
);
250 res
= ip6_xmit(sk
, skb
, fl6
, sk
->sk_mark
,
251 rcu_dereference(np
->opt
),
252 tclass
, sk
->sk_priority
);
258 skb_shinfo(skb
)->gso_type
|= SKB_GSO_UDP_TUNNEL_CSUM
;
260 skb
->encapsulation
= 1;
261 skb_reset_inner_mac_header(skb
);
262 skb_reset_inner_transport_header(skb
);
263 skb_set_inner_ipproto(skb
, IPPROTO_SCTP
);
264 label
= ip6_make_flowlabel(sock_net(sk
), skb
, fl6
->flowlabel
, true, fl6
);
266 return udp_tunnel6_xmit_skb(dst
, sk
, skb
, NULL
, &fl6
->saddr
,
267 &fl6
->daddr
, tclass
, ip6_dst_hoplimit(dst
),
268 label
, sctp_sk(sk
)->udp_port
, t
->encap_port
, false);
271 /* Returns the dst cache entry for the given source and destination ip
274 static void sctp_v6_get_dst(struct sctp_transport
*t
, union sctp_addr
*saddr
,
275 struct flowi
*fl
, struct sock
*sk
)
277 struct sctp_association
*asoc
= t
->asoc
;
278 struct dst_entry
*dst
= NULL
;
280 struct flowi6
*fl6
= &_fl
.u
.ip6
;
281 struct sctp_bind_addr
*bp
;
282 struct ipv6_pinfo
*np
= inet6_sk(sk
);
283 struct sctp_sockaddr_entry
*laddr
;
284 union sctp_addr
*daddr
= &t
->ipaddr
;
285 union sctp_addr dst_saddr
;
286 struct in6_addr
*final_p
, final
;
287 enum sctp_scope scope
;
290 memset(&_fl
, 0, sizeof(_fl
));
291 fl6
->daddr
= daddr
->v6
.sin6_addr
;
292 fl6
->fl6_dport
= daddr
->v6
.sin6_port
;
293 fl6
->flowi6_proto
= IPPROTO_SCTP
;
294 if (ipv6_addr_type(&daddr
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
295 fl6
->flowi6_oif
= daddr
->v6
.sin6_scope_id
;
297 fl6
->flowi6_oif
= asoc
->base
.sk
->sk_bound_dev_if
;
298 if (t
->flowlabel
& SCTP_FLOWLABEL_SET_MASK
)
299 fl6
->flowlabel
= htonl(t
->flowlabel
& SCTP_FLOWLABEL_VAL_MASK
);
301 if (np
->sndflow
&& (fl6
->flowlabel
& IPV6_FLOWLABEL_MASK
)) {
302 struct ip6_flowlabel
*flowlabel
;
304 flowlabel
= fl6_sock_lookup(sk
, fl6
->flowlabel
);
305 if (IS_ERR(flowlabel
))
307 fl6_sock_release(flowlabel
);
310 pr_debug("%s: dst=%pI6 ", __func__
, &fl6
->daddr
);
313 fl6
->fl6_sport
= htons(asoc
->base
.bind_addr
.port
);
316 fl6
->saddr
= saddr
->v6
.sin6_addr
;
318 fl6
->fl6_sport
= saddr
->v6
.sin6_port
;
320 pr_debug("src=%pI6 - ", &fl6
->saddr
);
324 final_p
= fl6_update_dst(fl6
, rcu_dereference(np
->opt
), &final
);
327 dst
= ip6_dst_lookup_flow(sock_net(sk
), sk
, fl6
, final_p
);
328 if (!asoc
|| saddr
) {
330 memcpy(fl
, &_fl
, sizeof(_fl
));
334 bp
= &asoc
->base
.bind_addr
;
335 scope
= sctp_scope(daddr
);
336 /* ip6_dst_lookup has filled in the fl6->saddr for us. Check
337 * to see if we can use it.
340 /* Walk through the bind address list and look for a bind
341 * address that matches the source address of the returned dst.
343 sctp_v6_to_addr(&dst_saddr
, &fl6
->saddr
, htons(bp
->port
));
345 list_for_each_entry_rcu(laddr
, &bp
->address_list
, list
) {
346 if (!laddr
->valid
|| laddr
->state
== SCTP_ADDR_DEL
||
347 (laddr
->state
!= SCTP_ADDR_SRC
&&
348 !asoc
->src_out_of_asoc_ok
))
351 /* Do not compare against v4 addrs */
352 if ((laddr
->a
.sa
.sa_family
== AF_INET6
) &&
353 (sctp_v6_cmp_addr(&dst_saddr
, &laddr
->a
))) {
356 memcpy(fl
, &_fl
, sizeof(_fl
));
361 /* None of the bound addresses match the source address of the
362 * dst. So release it.
368 /* Walk through the bind address list and try to get the
369 * best source address for a given destination.
372 list_for_each_entry_rcu(laddr
, &bp
->address_list
, list
) {
373 struct dst_entry
*bdst
;
377 laddr
->state
!= SCTP_ADDR_SRC
||
378 laddr
->a
.sa
.sa_family
!= AF_INET6
||
379 scope
> sctp_scope(&laddr
->a
))
382 fl6
->saddr
= laddr
->a
.v6
.sin6_addr
;
383 fl6
->fl6_sport
= laddr
->a
.v6
.sin6_port
;
384 final_p
= fl6_update_dst(fl6
, rcu_dereference(np
->opt
), &final
);
385 bdst
= ip6_dst_lookup_flow(sock_net(sk
), sk
, fl6
, final_p
);
390 if (ipv6_chk_addr(dev_net(bdst
->dev
),
391 &laddr
->a
.v6
.sin6_addr
, bdst
->dev
, 1)) {
392 if (!IS_ERR_OR_NULL(dst
))
396 memcpy(fl
, &_fl
, sizeof(_fl
));
400 bmatchlen
= sctp_v6_addr_match_len(daddr
, &laddr
->a
);
401 if (matchlen
> bmatchlen
) {
406 if (!IS_ERR_OR_NULL(dst
))
409 matchlen
= bmatchlen
;
411 memcpy(fl
, &_fl
, sizeof(_fl
));
416 if (!IS_ERR_OR_NULL(dst
)) {
419 rt
= (struct rt6_info
*)dst
;
420 t
->dst_cookie
= rt6_get_cookie(rt
);
421 pr_debug("rt6_dst:%pI6/%d rt6_src:%pI6\n",
422 &rt
->rt6i_dst
.addr
, rt
->rt6i_dst
.plen
,
426 pr_debug("no route\n");
430 /* Returns the number of consecutive initial bits that match in the 2 ipv6
433 static inline int sctp_v6_addr_match_len(union sctp_addr
*s1
,
436 return ipv6_addr_diff(&s1
->v6
.sin6_addr
, &s2
->v6
.sin6_addr
);
439 /* Fills in the source address(saddr) based on the destination address(daddr)
440 * and asoc's bind address list.
442 static void sctp_v6_get_saddr(struct sctp_sock
*sk
,
443 struct sctp_transport
*t
,
446 struct flowi6
*fl6
= &fl
->u
.ip6
;
447 union sctp_addr
*saddr
= &t
->saddr
;
449 pr_debug("%s: asoc:%p dst:%p\n", __func__
, t
->asoc
, t
->dst
);
452 saddr
->v6
.sin6_family
= AF_INET6
;
453 saddr
->v6
.sin6_addr
= fl6
->saddr
;
457 /* Make a copy of all potential local addresses. */
458 static void sctp_v6_copy_addrlist(struct list_head
*addrlist
,
459 struct net_device
*dev
)
461 struct inet6_dev
*in6_dev
;
462 struct inet6_ifaddr
*ifp
;
463 struct sctp_sockaddr_entry
*addr
;
466 if ((in6_dev
= __in6_dev_get(dev
)) == NULL
) {
471 read_lock_bh(&in6_dev
->lock
);
472 list_for_each_entry(ifp
, &in6_dev
->addr_list
, if_list
) {
473 /* Add the address to the local list. */
474 addr
= kzalloc(sizeof(*addr
), GFP_ATOMIC
);
476 addr
->a
.v6
.sin6_family
= AF_INET6
;
477 addr
->a
.v6
.sin6_addr
= ifp
->addr
;
478 addr
->a
.v6
.sin6_scope_id
= dev
->ifindex
;
480 INIT_LIST_HEAD(&addr
->list
);
481 list_add_tail(&addr
->list
, addrlist
);
485 read_unlock_bh(&in6_dev
->lock
);
489 /* Copy over any ip options */
490 static void sctp_v6_copy_ip_options(struct sock
*sk
, struct sock
*newsk
)
492 struct ipv6_pinfo
*newnp
, *np
= inet6_sk(sk
);
493 struct ipv6_txoptions
*opt
;
495 newnp
= inet6_sk(newsk
);
498 opt
= rcu_dereference(np
->opt
);
500 opt
= ipv6_dup_options(newsk
, opt
);
502 pr_err("%s: Failed to copy ip options\n", __func__
);
504 RCU_INIT_POINTER(newnp
->opt
, opt
);
508 /* Account for the IP options */
509 static int sctp_v6_ip_options_len(struct sock
*sk
)
511 struct ipv6_pinfo
*np
= inet6_sk(sk
);
512 struct ipv6_txoptions
*opt
;
516 opt
= rcu_dereference(np
->opt
);
518 len
= opt
->opt_flen
+ opt
->opt_nflen
;
524 /* Initialize a sockaddr_storage from in incoming skb. */
525 static void sctp_v6_from_skb(union sctp_addr
*addr
, struct sk_buff
*skb
,
528 /* Always called on head skb, so this is safe */
529 struct sctphdr
*sh
= sctp_hdr(skb
);
530 struct sockaddr_in6
*sa
= &addr
->v6
;
532 addr
->v6
.sin6_family
= AF_INET6
;
533 addr
->v6
.sin6_flowinfo
= 0; /* FIXME */
534 addr
->v6
.sin6_scope_id
= ((struct inet6_skb_parm
*)skb
->cb
)->iif
;
537 sa
->sin6_port
= sh
->source
;
538 sa
->sin6_addr
= ipv6_hdr(skb
)->saddr
;
540 sa
->sin6_port
= sh
->dest
;
541 sa
->sin6_addr
= ipv6_hdr(skb
)->daddr
;
545 /* Initialize an sctp_addr from a socket. */
546 static void sctp_v6_from_sk(union sctp_addr
*addr
, struct sock
*sk
)
548 addr
->v6
.sin6_family
= AF_INET6
;
549 addr
->v6
.sin6_port
= 0;
550 addr
->v6
.sin6_addr
= sk
->sk_v6_rcv_saddr
;
553 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
554 static void sctp_v6_to_sk_saddr(union sctp_addr
*addr
, struct sock
*sk
)
556 if (addr
->sa
.sa_family
== AF_INET
) {
557 sk
->sk_v6_rcv_saddr
.s6_addr32
[0] = 0;
558 sk
->sk_v6_rcv_saddr
.s6_addr32
[1] = 0;
559 sk
->sk_v6_rcv_saddr
.s6_addr32
[2] = htonl(0x0000ffff);
560 sk
->sk_v6_rcv_saddr
.s6_addr32
[3] =
561 addr
->v4
.sin_addr
.s_addr
;
563 sk
->sk_v6_rcv_saddr
= addr
->v6
.sin6_addr
;
567 /* Initialize sk->sk_daddr from sctp_addr. */
568 static void sctp_v6_to_sk_daddr(union sctp_addr
*addr
, struct sock
*sk
)
570 if (addr
->sa
.sa_family
== AF_INET
) {
571 sk
->sk_v6_daddr
.s6_addr32
[0] = 0;
572 sk
->sk_v6_daddr
.s6_addr32
[1] = 0;
573 sk
->sk_v6_daddr
.s6_addr32
[2] = htonl(0x0000ffff);
574 sk
->sk_v6_daddr
.s6_addr32
[3] = addr
->v4
.sin_addr
.s_addr
;
576 sk
->sk_v6_daddr
= addr
->v6
.sin6_addr
;
580 /* Initialize a sctp_addr from an address parameter. */
581 static bool sctp_v6_from_addr_param(union sctp_addr
*addr
,
582 union sctp_addr_param
*param
,
583 __be16 port
, int iif
)
585 if (ntohs(param
->v6
.param_hdr
.length
) < sizeof(struct sctp_ipv6addr_param
))
588 addr
->v6
.sin6_family
= AF_INET6
;
589 addr
->v6
.sin6_port
= port
;
590 addr
->v6
.sin6_flowinfo
= 0; /* BUG */
591 addr
->v6
.sin6_addr
= param
->v6
.addr
;
592 addr
->v6
.sin6_scope_id
= iif
;
597 /* Initialize an address parameter from a sctp_addr and return the length
598 * of the address parameter.
600 static int sctp_v6_to_addr_param(const union sctp_addr
*addr
,
601 union sctp_addr_param
*param
)
603 int length
= sizeof(struct sctp_ipv6addr_param
);
605 param
->v6
.param_hdr
.type
= SCTP_PARAM_IPV6_ADDRESS
;
606 param
->v6
.param_hdr
.length
= htons(length
);
607 param
->v6
.addr
= addr
->v6
.sin6_addr
;
612 /* Initialize a sctp_addr from struct in6_addr. */
613 static void sctp_v6_to_addr(union sctp_addr
*addr
, struct in6_addr
*saddr
,
616 addr
->sa
.sa_family
= AF_INET6
;
617 addr
->v6
.sin6_port
= port
;
618 addr
->v6
.sin6_flowinfo
= 0;
619 addr
->v6
.sin6_addr
= *saddr
;
620 addr
->v6
.sin6_scope_id
= 0;
623 static int __sctp_v6_cmp_addr(const union sctp_addr
*addr1
,
624 const union sctp_addr
*addr2
)
626 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
) {
627 if (addr1
->sa
.sa_family
== AF_INET
&&
628 addr2
->sa
.sa_family
== AF_INET6
&&
629 ipv6_addr_v4mapped(&addr2
->v6
.sin6_addr
) &&
630 addr2
->v6
.sin6_addr
.s6_addr32
[3] ==
631 addr1
->v4
.sin_addr
.s_addr
)
634 if (addr2
->sa
.sa_family
== AF_INET
&&
635 addr1
->sa
.sa_family
== AF_INET6
&&
636 ipv6_addr_v4mapped(&addr1
->v6
.sin6_addr
) &&
637 addr1
->v6
.sin6_addr
.s6_addr32
[3] ==
638 addr2
->v4
.sin_addr
.s_addr
)
644 if (!ipv6_addr_equal(&addr1
->v6
.sin6_addr
, &addr2
->v6
.sin6_addr
))
647 /* If this is a linklocal address, compare the scope_id. */
648 if ((ipv6_addr_type(&addr1
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
) &&
649 addr1
->v6
.sin6_scope_id
&& addr2
->v6
.sin6_scope_id
&&
650 addr1
->v6
.sin6_scope_id
!= addr2
->v6
.sin6_scope_id
)
656 /* Compare addresses exactly.
657 * v4-mapped-v6 is also in consideration.
659 static int sctp_v6_cmp_addr(const union sctp_addr
*addr1
,
660 const union sctp_addr
*addr2
)
662 return __sctp_v6_cmp_addr(addr1
, addr2
) &&
663 addr1
->v6
.sin6_port
== addr2
->v6
.sin6_port
;
666 /* Initialize addr struct to INADDR_ANY. */
667 static void sctp_v6_inaddr_any(union sctp_addr
*addr
, __be16 port
)
669 memset(addr
, 0x00, sizeof(union sctp_addr
));
670 addr
->v6
.sin6_family
= AF_INET6
;
671 addr
->v6
.sin6_port
= port
;
674 /* Is this a wildcard address? */
675 static int sctp_v6_is_any(const union sctp_addr
*addr
)
677 return ipv6_addr_any(&addr
->v6
.sin6_addr
);
680 /* Should this be available for binding? */
681 static int sctp_v6_available(union sctp_addr
*addr
, struct sctp_sock
*sp
)
684 struct net
*net
= sock_net(&sp
->inet
.sk
);
685 const struct in6_addr
*in6
= (const struct in6_addr
*)&addr
->v6
.sin6_addr
;
687 type
= ipv6_addr_type(in6
);
688 if (IPV6_ADDR_ANY
== type
)
690 if (type
== IPV6_ADDR_MAPPED
) {
691 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
693 sctp_v6_map_v4(addr
);
694 return sctp_get_af_specific(AF_INET
)->available(addr
, sp
);
696 if (!(type
& IPV6_ADDR_UNICAST
))
699 return ipv6_can_nonlocal_bind(net
, &sp
->inet
) ||
700 ipv6_chk_addr(net
, in6
, NULL
, 0);
703 /* This function checks if the address is a valid address to be used for
707 * Return 0 - If the address is a non-unicast or an illegal address.
708 * Return 1 - If the address is a unicast.
710 static int sctp_v6_addr_valid(union sctp_addr
*addr
,
711 struct sctp_sock
*sp
,
712 const struct sk_buff
*skb
)
714 int ret
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
716 /* Support v4-mapped-v6 address. */
717 if (ret
== IPV6_ADDR_MAPPED
) {
718 /* Note: This routine is used in input, so v4-mapped-v6
719 * are disallowed here when there is no sctp_sock.
721 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
723 sctp_v6_map_v4(addr
);
724 return sctp_get_af_specific(AF_INET
)->addr_valid(addr
, sp
, skb
);
727 /* Is this a non-unicast address */
728 if (!(ret
& IPV6_ADDR_UNICAST
))
734 /* What is the scope of 'addr'? */
735 static enum sctp_scope
sctp_v6_scope(union sctp_addr
*addr
)
737 enum sctp_scope retval
;
740 /* The IPv6 scope is really a set of bit fields.
741 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
744 v6scope
= ipv6_addr_scope(&addr
->v6
.sin6_addr
);
747 retval
= SCTP_SCOPE_LOOPBACK
;
750 retval
= SCTP_SCOPE_LINK
;
753 retval
= SCTP_SCOPE_PRIVATE
;
756 retval
= SCTP_SCOPE_GLOBAL
;
763 /* Create and initialize a new sk for the socket to be returned by accept(). */
764 static struct sock
*sctp_v6_create_accept_sk(struct sock
*sk
,
765 struct sctp_association
*asoc
,
769 struct ipv6_pinfo
*newnp
, *np
= inet6_sk(sk
);
770 struct sctp6_sock
*newsctp6sk
;
772 newsk
= sk_alloc(sock_net(sk
), PF_INET6
, GFP_KERNEL
, sk
->sk_prot
, kern
);
776 sock_init_data(NULL
, newsk
);
778 sctp_copy_sock(newsk
, sk
, asoc
);
779 sock_reset_flag(sk
, SOCK_ZAPPED
);
781 newsctp6sk
= (struct sctp6_sock
*)newsk
;
782 inet_sk(newsk
)->pinet6
= &newsctp6sk
->inet6
;
784 sctp_sk(newsk
)->v4mapped
= sctp_sk(sk
)->v4mapped
;
786 newnp
= inet6_sk(newsk
);
788 memcpy(newnp
, np
, sizeof(struct ipv6_pinfo
));
789 newnp
->ipv6_mc_list
= NULL
;
790 newnp
->ipv6_ac_list
= NULL
;
791 newnp
->ipv6_fl_list
= NULL
;
793 sctp_v6_copy_ip_options(sk
, newsk
);
795 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
798 sctp_v6_to_sk_daddr(&asoc
->peer
.primary_addr
, newsk
);
800 newsk
->sk_v6_rcv_saddr
= sk
->sk_v6_rcv_saddr
;
802 sk_refcnt_debug_inc(newsk
);
804 if (newsk
->sk_prot
->init(newsk
)) {
805 sk_common_release(newsk
);
813 /* Format a sockaddr for return to user space. This makes sure the return is
814 * AF_INET or AF_INET6 depending on the SCTP_I_WANT_MAPPED_V4_ADDR option.
816 static int sctp_v6_addr_to_user(struct sctp_sock
*sp
, union sctp_addr
*addr
)
819 if (addr
->sa
.sa_family
== AF_INET
)
820 sctp_v4_map_v6(addr
);
822 if (addr
->sa
.sa_family
== AF_INET6
&&
823 ipv6_addr_v4mapped(&addr
->v6
.sin6_addr
))
824 sctp_v6_map_v4(addr
);
827 if (addr
->sa
.sa_family
== AF_INET
) {
828 memset(addr
->v4
.sin_zero
, 0, sizeof(addr
->v4
.sin_zero
));
829 return sizeof(struct sockaddr_in
);
831 return sizeof(struct sockaddr_in6
);
834 /* Where did this skb come from? */
835 static int sctp_v6_skb_iif(const struct sk_buff
*skb
)
837 return IP6CB(skb
)->iif
;
840 /* Was this packet marked by Explicit Congestion Notification? */
841 static int sctp_v6_is_ce(const struct sk_buff
*skb
)
843 return *((__u32
*)(ipv6_hdr(skb
))) & (__force __u32
)htonl(1 << 20);
846 /* Dump the v6 addr to the seq file. */
847 static void sctp_v6_seq_dump_addr(struct seq_file
*seq
, union sctp_addr
*addr
)
849 seq_printf(seq
, "%pI6 ", &addr
->v6
.sin6_addr
);
852 static void sctp_v6_ecn_capable(struct sock
*sk
)
854 inet6_sk(sk
)->tclass
|= INET_ECN_ECT_0
;
857 /* Initialize a PF_INET msgname from a ulpevent. */
858 static void sctp_inet6_event_msgname(struct sctp_ulpevent
*event
,
859 char *msgname
, int *addrlen
)
861 union sctp_addr
*addr
;
862 struct sctp_association
*asoc
;
863 union sctp_addr
*paddr
;
868 addr
= (union sctp_addr
*)msgname
;
870 paddr
= &asoc
->peer
.primary_addr
;
872 if (paddr
->sa
.sa_family
== AF_INET
) {
873 addr
->v4
.sin_family
= AF_INET
;
874 addr
->v4
.sin_port
= htons(asoc
->peer
.port
);
875 addr
->v4
.sin_addr
= paddr
->v4
.sin_addr
;
877 addr
->v6
.sin6_family
= AF_INET6
;
878 addr
->v6
.sin6_flowinfo
= 0;
879 if (ipv6_addr_type(&paddr
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
880 addr
->v6
.sin6_scope_id
= paddr
->v6
.sin6_scope_id
;
882 addr
->v6
.sin6_scope_id
= 0;
883 addr
->v6
.sin6_port
= htons(asoc
->peer
.port
);
884 addr
->v6
.sin6_addr
= paddr
->v6
.sin6_addr
;
887 *addrlen
= sctp_v6_addr_to_user(sctp_sk(asoc
->base
.sk
), addr
);
890 /* Initialize a msg_name from an inbound skb. */
891 static void sctp_inet6_skb_msgname(struct sk_buff
*skb
, char *msgname
,
894 union sctp_addr
*addr
;
900 addr
= (union sctp_addr
*)msgname
;
903 if (ip_hdr(skb
)->version
== 4) {
904 addr
->v4
.sin_family
= AF_INET
;
905 addr
->v4
.sin_port
= sh
->source
;
906 addr
->v4
.sin_addr
.s_addr
= ip_hdr(skb
)->saddr
;
908 addr
->v6
.sin6_family
= AF_INET6
;
909 addr
->v6
.sin6_flowinfo
= 0;
910 addr
->v6
.sin6_port
= sh
->source
;
911 addr
->v6
.sin6_addr
= ipv6_hdr(skb
)->saddr
;
912 if (ipv6_addr_type(&addr
->v6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
913 addr
->v6
.sin6_scope_id
= sctp_v6_skb_iif(skb
);
915 addr
->v6
.sin6_scope_id
= 0;
918 *addr_len
= sctp_v6_addr_to_user(sctp_sk(skb
->sk
), addr
);
921 /* Do we support this AF? */
922 static int sctp_inet6_af_supported(sa_family_t family
, struct sctp_sock
*sp
)
927 /* v4-mapped-v6 addresses */
929 if (!__ipv6_only_sock(sctp_opt2sk(sp
)))
937 /* Address matching with wildcards allowed. This extra level
938 * of indirection lets us choose whether a PF_INET6 should
939 * disallow any v4 addresses if we so choose.
941 static int sctp_inet6_cmp_addr(const union sctp_addr
*addr1
,
942 const union sctp_addr
*addr2
,
943 struct sctp_sock
*opt
)
945 struct sock
*sk
= sctp_opt2sk(opt
);
946 struct sctp_af
*af1
, *af2
;
948 af1
= sctp_get_af_specific(addr1
->sa
.sa_family
);
949 af2
= sctp_get_af_specific(addr2
->sa
.sa_family
);
954 /* If the socket is IPv6 only, v4 addrs will not match */
955 if (__ipv6_only_sock(sk
) && af1
!= af2
)
958 /* Today, wildcard AF_INET/AF_INET6. */
959 if (sctp_is_any(sk
, addr1
) || sctp_is_any(sk
, addr2
))
962 if (addr1
->sa
.sa_family
== AF_INET
&& addr2
->sa
.sa_family
== AF_INET
)
963 return addr1
->v4
.sin_addr
.s_addr
== addr2
->v4
.sin_addr
.s_addr
;
965 return __sctp_v6_cmp_addr(addr1
, addr2
);
968 /* Verify that the provided sockaddr looks bindable. Common verification,
969 * has already been taken care of.
971 static int sctp_inet6_bind_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
975 /* ASSERT: address family has already been verified. */
976 if (addr
->sa
.sa_family
!= AF_INET6
)
977 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
979 int type
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
980 struct net_device
*dev
;
982 if (type
& IPV6_ADDR_LINKLOCAL
) {
984 if (!addr
->v6
.sin6_scope_id
)
986 net
= sock_net(&opt
->inet
.sk
);
988 dev
= dev_get_by_index_rcu(net
, addr
->v6
.sin6_scope_id
);
989 if (!dev
|| !(ipv6_can_nonlocal_bind(net
, &opt
->inet
) ||
990 ipv6_chk_addr(net
, &addr
->v6
.sin6_addr
,
1000 return af
->available(addr
, opt
);
1003 /* Verify that the provided sockaddr looks sendable. Common verification,
1004 * has already been taken care of.
1006 static int sctp_inet6_send_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
1008 struct sctp_af
*af
= NULL
;
1010 /* ASSERT: address family has already been verified. */
1011 if (addr
->sa
.sa_family
!= AF_INET6
)
1012 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
1014 int type
= ipv6_addr_type(&addr
->v6
.sin6_addr
);
1015 struct net_device
*dev
;
1017 if (type
& IPV6_ADDR_LINKLOCAL
) {
1018 if (!addr
->v6
.sin6_scope_id
)
1021 dev
= dev_get_by_index_rcu(sock_net(&opt
->inet
.sk
),
1022 addr
->v6
.sin6_scope_id
);
1033 /* Fill in Supported Address Type information for INIT and INIT-ACK
1034 * chunks. Note: In the future, we may want to look at sock options
1035 * to determine whether a PF_INET6 socket really wants to have IPV4
1037 * Returns number of addresses supported.
1039 static int sctp_inet6_supported_addrs(const struct sctp_sock
*opt
,
1042 types
[0] = SCTP_PARAM_IPV6_ADDRESS
;
1043 if (!opt
|| !ipv6_only_sock(sctp_opt2sk(opt
))) {
1044 types
[1] = SCTP_PARAM_IPV4_ADDRESS
;
1050 /* Handle SCTP_I_WANT_MAPPED_V4_ADDR for getpeername() and getsockname() */
1051 static int sctp_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
1056 rc
= inet6_getname(sock
, uaddr
, peer
);
1061 rc
= sctp_v6_addr_to_user(sctp_sk(sock
->sk
),
1062 (union sctp_addr
*)uaddr
);
1067 static const struct proto_ops inet6_seqpacket_ops
= {
1069 .owner
= THIS_MODULE
,
1070 .release
= inet6_release
,
1072 .connect
= sctp_inet_connect
,
1073 .socketpair
= sock_no_socketpair
,
1074 .accept
= inet_accept
,
1075 .getname
= sctp_getname
,
1077 .ioctl
= inet6_ioctl
,
1078 .gettstamp
= sock_gettstamp
,
1079 .listen
= sctp_inet_listen
,
1080 .shutdown
= inet_shutdown
,
1081 .setsockopt
= sock_common_setsockopt
,
1082 .getsockopt
= sock_common_getsockopt
,
1083 .sendmsg
= inet_sendmsg
,
1084 .recvmsg
= inet_recvmsg
,
1085 .mmap
= sock_no_mmap
,
1086 #ifdef CONFIG_COMPAT
1087 .compat_ioctl
= inet6_compat_ioctl
,
1091 static struct inet_protosw sctpv6_seqpacket_protosw
= {
1092 .type
= SOCK_SEQPACKET
,
1093 .protocol
= IPPROTO_SCTP
,
1094 .prot
= &sctpv6_prot
,
1095 .ops
= &inet6_seqpacket_ops
,
1096 .flags
= SCTP_PROTOSW_FLAG
1098 static struct inet_protosw sctpv6_stream_protosw
= {
1099 .type
= SOCK_STREAM
,
1100 .protocol
= IPPROTO_SCTP
,
1101 .prot
= &sctpv6_prot
,
1102 .ops
= &inet6_seqpacket_ops
,
1103 .flags
= SCTP_PROTOSW_FLAG
,
1106 static int sctp6_rcv(struct sk_buff
*skb
)
1108 SCTP_INPUT_CB(skb
)->encap_port
= 0;
1109 return sctp_rcv(skb
) ? -1 : 0;
1112 static const struct inet6_protocol sctpv6_protocol
= {
1113 .handler
= sctp6_rcv
,
1114 .err_handler
= sctp_v6_err
,
1115 .flags
= INET6_PROTO_NOPOLICY
| INET6_PROTO_FINAL
,
1118 static struct sctp_af sctp_af_inet6
= {
1119 .sa_family
= AF_INET6
,
1120 .sctp_xmit
= sctp_v6_xmit
,
1121 .setsockopt
= ipv6_setsockopt
,
1122 .getsockopt
= ipv6_getsockopt
,
1123 .get_dst
= sctp_v6_get_dst
,
1124 .get_saddr
= sctp_v6_get_saddr
,
1125 .copy_addrlist
= sctp_v6_copy_addrlist
,
1126 .from_skb
= sctp_v6_from_skb
,
1127 .from_sk
= sctp_v6_from_sk
,
1128 .from_addr_param
= sctp_v6_from_addr_param
,
1129 .to_addr_param
= sctp_v6_to_addr_param
,
1130 .cmp_addr
= sctp_v6_cmp_addr
,
1131 .scope
= sctp_v6_scope
,
1132 .addr_valid
= sctp_v6_addr_valid
,
1133 .inaddr_any
= sctp_v6_inaddr_any
,
1134 .is_any
= sctp_v6_is_any
,
1135 .available
= sctp_v6_available
,
1136 .skb_iif
= sctp_v6_skb_iif
,
1137 .is_ce
= sctp_v6_is_ce
,
1138 .seq_dump_addr
= sctp_v6_seq_dump_addr
,
1139 .ecn_capable
= sctp_v6_ecn_capable
,
1140 .net_header_len
= sizeof(struct ipv6hdr
),
1141 .sockaddr_len
= sizeof(struct sockaddr_in6
),
1142 .ip_options_len
= sctp_v6_ip_options_len
,
1145 static struct sctp_pf sctp_pf_inet6
= {
1146 .event_msgname
= sctp_inet6_event_msgname
,
1147 .skb_msgname
= sctp_inet6_skb_msgname
,
1148 .af_supported
= sctp_inet6_af_supported
,
1149 .cmp_addr
= sctp_inet6_cmp_addr
,
1150 .bind_verify
= sctp_inet6_bind_verify
,
1151 .send_verify
= sctp_inet6_send_verify
,
1152 .supported_addrs
= sctp_inet6_supported_addrs
,
1153 .create_accept_sk
= sctp_v6_create_accept_sk
,
1154 .addr_to_user
= sctp_v6_addr_to_user
,
1155 .to_sk_saddr
= sctp_v6_to_sk_saddr
,
1156 .to_sk_daddr
= sctp_v6_to_sk_daddr
,
1157 .copy_ip_options
= sctp_v6_copy_ip_options
,
1158 .af
= &sctp_af_inet6
,
1161 /* Initialize IPv6 support and register with socket layer. */
1162 void sctp_v6_pf_init(void)
1164 /* Register the SCTP specific PF_INET6 functions. */
1165 sctp_register_pf(&sctp_pf_inet6
, PF_INET6
);
1167 /* Register the SCTP specific AF_INET6 functions. */
1168 sctp_register_af(&sctp_af_inet6
);
1171 void sctp_v6_pf_exit(void)
1173 list_del(&sctp_af_inet6
.list
);
1176 /* Initialize IPv6 support and register with socket layer. */
1177 int sctp_v6_protosw_init(void)
1181 rc
= proto_register(&sctpv6_prot
, 1);
1185 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1186 inet6_register_protosw(&sctpv6_seqpacket_protosw
);
1187 inet6_register_protosw(&sctpv6_stream_protosw
);
1192 void sctp_v6_protosw_exit(void)
1194 inet6_unregister_protosw(&sctpv6_seqpacket_protosw
);
1195 inet6_unregister_protosw(&sctpv6_stream_protosw
);
1196 proto_unregister(&sctpv6_prot
);
1200 /* Register with inet6 layer. */
1201 int sctp_v6_add_protocol(void)
1203 /* Register notifier for inet6 address additions/deletions. */
1204 register_inet6addr_notifier(&sctp_inet6addr_notifier
);
1206 if (inet6_add_protocol(&sctpv6_protocol
, IPPROTO_SCTP
) < 0)
1212 /* Unregister with inet6 layer. */
1213 void sctp_v6_del_protocol(void)
1215 inet6_del_protocol(&sctpv6_protocol
, IPPROTO_SCTP
);
1216 unregister_inet6addr_notifier(&sctp_inet6addr_notifier
);