1 /* $FreeBSD: src/sys/netinet6/route6.c,v 1.1.2.5 2003/01/23 21:06:47 sam Exp $ */
2 /* $DragonFly: src/sys/netinet6/route6.c,v 1.6 2006/10/24 06:18:42 hsu Exp $ */
3 /* $KAME: route6.c,v 1.24 2001/03/14 03:07:05 itojun Exp $ */
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #include "opt_inet6.h"
37 #include <sys/param.h>
39 #include <sys/socket.h>
40 #include <sys/systm.h>
41 #include <sys/queue.h>
45 #include <netinet/in.h>
46 #include <netinet6/in6_var.h>
47 #include <netinet/ip6.h>
48 #include <netinet6/ip6_var.h>
50 #include <netinet/icmp6.h>
52 static int ip6_rthdr0 (struct mbuf
*, struct ip6_hdr
*,
56 route6_input(struct mbuf
**mp
, int *offp
, int proto
) /* proto is unused */
61 int off
= *offp
, rhlen
;
64 IP6_EXTHDR_CHECK(m
, off
, sizeof(*rh
), IPPROTO_DONE
);
65 ip6
= mtod(m
, struct ip6_hdr
*);
66 rh
= (struct ip6_rthdr
*)((caddr_t
)ip6
+ off
);
68 ip6
= mtod(m
, struct ip6_hdr
*);
69 IP6_EXTHDR_GET(rh
, struct ip6_rthdr
*, m
, off
, sizeof(*rh
));
71 ip6stat
.ip6s_tooshort
++;
76 switch (rh
->ip6r_type
) {
77 case IPV6_RTHDR_TYPE_0
:
78 rhlen
= (rh
->ip6r_len
+ 1) << 3;
81 * note on option length:
82 * due to IP6_EXTHDR_CHECK assumption, we cannot handle
83 * very big routing header (max rhlen == 2048).
85 IP6_EXTHDR_CHECK(m
, off
, rhlen
, IPPROTO_DONE
);
88 * note on option length:
90 * max mbuf m_pulldown can handle: MCLBYTES == usually 2048
91 * so, here we are assuming that m_pulldown can handle
92 * rhlen == 2048 case. this may not be a good thing to
93 * assume - we may want to avoid pulling it up altogether.
95 IP6_EXTHDR_GET(rh
, struct ip6_rthdr
*, m
, off
, rhlen
);
97 ip6stat
.ip6s_tooshort
++;
101 if (ip6_rthdr0(m
, ip6
, (struct ip6_rthdr0
*)rh
))
102 return (IPPROTO_DONE
);
105 /* unknown routing type */
106 if (rh
->ip6r_segleft
== 0) {
107 rhlen
= (rh
->ip6r_len
+ 1) << 3;
108 break; /* Final dst. Just ignore the header. */
110 ip6stat
.ip6s_badoptions
++;
111 icmp6_error(m
, ICMP6_PARAM_PROB
, ICMP6_PARAMPROB_HEADER
,
112 (caddr_t
)&rh
->ip6r_type
- (caddr_t
)ip6
);
113 return (IPPROTO_DONE
);
117 return (rh
->ip6r_nxt
);
121 * Type0 routing header processing
123 * RFC2292 backward compatibility warning: no support for strict/loose bitmap,
124 * as it was dropped between RFC1883 and RFC2460.
127 ip6_rthdr0(struct mbuf
*m
, struct ip6_hdr
*ip6
, struct ip6_rthdr0
*rh0
)
130 struct in6_addr
*nextaddr
, tmpaddr
;
132 if (rh0
->ip6r0_segleft
== 0)
135 if (rh0
->ip6r0_len
% 2
136 #ifdef COMPAT_RFC1883
137 || rh0
->ip6r0_len
> 46
141 * Type 0 routing header can't contain more than 23 addresses.
142 * RFC 2462: this limitation was removed since strict/loose
143 * bitmap field was deleted.
145 ip6stat
.ip6s_badoptions
++;
146 icmp6_error(m
, ICMP6_PARAM_PROB
, ICMP6_PARAMPROB_HEADER
,
147 (caddr_t
)&rh0
->ip6r0_len
- (caddr_t
)ip6
);
151 if ((addrs
= rh0
->ip6r0_len
/ 2) < rh0
->ip6r0_segleft
) {
152 ip6stat
.ip6s_badoptions
++;
153 icmp6_error(m
, ICMP6_PARAM_PROB
, ICMP6_PARAMPROB_HEADER
,
154 (caddr_t
)&rh0
->ip6r0_segleft
- (caddr_t
)ip6
);
158 index
= addrs
- rh0
->ip6r0_segleft
;
159 rh0
->ip6r0_segleft
--;
160 /* note that ip6r0_addr does not exist in RFC2292bis */
161 nextaddr
= rh0
->ip6r0_addr
+ index
;
164 * reject invalid addresses. be proactive about malicious use of
165 * IPv4 mapped/compat address.
166 * XXX need more checks?
168 if (IN6_IS_ADDR_MULTICAST(nextaddr
) ||
169 IN6_IS_ADDR_UNSPECIFIED(nextaddr
) ||
170 IN6_IS_ADDR_V4MAPPED(nextaddr
) ||
171 IN6_IS_ADDR_V4COMPAT(nextaddr
)) {
172 ip6stat
.ip6s_badoptions
++;
176 if (IN6_IS_ADDR_MULTICAST(&ip6
->ip6_dst
) ||
177 IN6_IS_ADDR_UNSPECIFIED(&ip6
->ip6_dst
) ||
178 IN6_IS_ADDR_V4MAPPED(&ip6
->ip6_dst
) ||
179 IN6_IS_ADDR_V4COMPAT(&ip6
->ip6_dst
)) {
180 ip6stat
.ip6s_badoptions
++;
186 * Swap the IPv6 destination address and nextaddr. Forward the packet.
189 *nextaddr
= ip6
->ip6_dst
;
190 if (IN6_IS_ADDR_LINKLOCAL(nextaddr
))
191 nextaddr
->s6_addr16
[1] = 0;
192 ip6
->ip6_dst
= tmpaddr
;
193 if (IN6_IS_ADDR_LINKLOCAL(&ip6
->ip6_dst
))
194 ip6
->ip6_dst
.s6_addr16
[1] = htons(m
->m_pkthdr
.rcvif
->if_index
);
196 #ifdef COMPAT_RFC1883
197 if (rh0
->ip6r0_slmap
[index
/ 8] & (1 << (7 - (index
% 8))))
198 ip6_forward(m
, IPV6_SRCRT_NEIGHBOR
);
200 ip6_forward(m
, IPV6_SRCRT_NOTNEIGHBOR
);
205 return (-1); /* m would be freed in ip6_forward() */