2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * $KAME: route6.c,v 1.24 2001/03/14 03:07:05 itojun Exp $
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
36 #include "opt_inet6.h"
38 #include <sys/param.h>
40 #include <sys/socket.h>
41 #include <sys/systm.h>
42 #include <sys/queue.h>
43 #include <sys/vimage.h>
47 #include <netinet/in.h>
48 #include <netinet6/in6_var.h>
49 #include <netinet/ip6.h>
50 #include <netinet6/ip6_var.h>
51 #include <netinet6/scope6_var.h>
53 #include <netinet/icmp6.h>
56 static int ip6_rthdr0 __P((struct mbuf *, struct ip6_hdr *,
57 struct ip6_rthdr0 *));
59 #endif /* Disable route header processing. */
66 route6_input(struct mbuf **mp, int *offp, int proto)
68 INIT_VNET_INET6(curvnet);
72 int off = *offp, rhlen;
75 ip6a = ip6_findaux(m);
77 /* XXX reject home-address option before rthdr */
78 if (ip6a->ip6a_flags & IP6A_SWAP) {
79 V_ip6stat.ip6s_badoptions++;
86 IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE);
87 ip6 = mtod(m, struct ip6_hdr *);
88 rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
90 ip6 = mtod(m, struct ip6_hdr *);
91 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
93 V_ip6stat.ip6s_tooshort++;
98 switch (rh->ip6r_type) {
100 case IPV6_RTHDR_TYPE_0:
101 rhlen = (rh->ip6r_len + 1) << 3;
102 #ifndef PULLDOWN_TEST
104 * note on option length:
105 * due to IP6_EXTHDR_CHECK assumption, we cannot handle
106 * very big routing header (max rhlen == 2048).
108 IP6_EXTHDR_CHECK(m, off, rhlen, IPPROTO_DONE);
111 * note on option length:
112 * maximum rhlen: 2048
113 * max mbuf m_pulldown can handle: MCLBYTES == usually 2048
114 * so, here we are assuming that m_pulldown can handle
115 * rhlen == 2048 case. this may not be a good thing to
116 * assume - we may want to avoid pulling it up altogether.
118 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, rhlen);
120 V_ip6stat.ip6s_tooshort++;
124 if (ip6_rthdr0(m, ip6, (struct ip6_rthdr0 *)rh))
125 return (IPPROTO_DONE);
127 #endif /* Disable route header 0 */
129 /* unknown routing type */
130 if (rh->ip6r_segleft == 0) {
131 rhlen = (rh->ip6r_len + 1) << 3;
132 break; /* Final dst. Just ignore the header. */
134 V_ip6stat.ip6s_badoptions++;
135 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
136 (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
137 return (IPPROTO_DONE);
141 return (rh->ip6r_nxt);
145 * Type0 routing header processing
147 * RFC2292 backward compatibility warning: no support for strict/loose bitmap,
148 * as it was dropped between RFC1883 and RFC2460.
152 ip6_rthdr0(struct mbuf *m, struct ip6_hdr *ip6, struct ip6_rthdr0 *rh0)
154 INIT_VNET_INET6(curvnet);
156 struct in6_addr *nextaddr, tmpaddr;
157 struct in6_ifaddr *ifa;
159 if (rh0->ip6r0_segleft == 0)
162 if (rh0->ip6r0_len % 2
163 #ifdef COMPAT_RFC1883
164 || rh0->ip6r0_len > 46
168 * Type 0 routing header can't contain more than 23 addresses.
169 * RFC 2462: this limitation was removed since strict/loose
170 * bitmap field was deleted.
172 V_ip6stat.ip6s_badoptions++;
173 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
174 (caddr_t)&rh0->ip6r0_len - (caddr_t)ip6);
178 if ((addrs = rh0->ip6r0_len / 2) < rh0->ip6r0_segleft) {
179 V_ip6stat.ip6s_badoptions++;
180 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
181 (caddr_t)&rh0->ip6r0_segleft - (caddr_t)ip6);
185 index = addrs - rh0->ip6r0_segleft;
186 rh0->ip6r0_segleft--;
187 nextaddr = ((struct in6_addr *)(rh0 + 1)) + index;
190 * reject invalid addresses. be proactive about malicious use of
191 * IPv4 mapped/compat address.
192 * XXX need more checks?
194 if (IN6_IS_ADDR_MULTICAST(nextaddr) ||
195 IN6_IS_ADDR_UNSPECIFIED(nextaddr) ||
196 IN6_IS_ADDR_V4MAPPED(nextaddr) ||
197 IN6_IS_ADDR_V4COMPAT(nextaddr)) {
198 V_ip6stat.ip6s_badoptions++;
202 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
203 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst) ||
204 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst) ||
205 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
206 V_ip6stat.ip6s_badoptions++;
212 * Determine the scope zone of the next hop, based on the interface
213 * of the current hop. [RFC4007, Section 9]
214 * Then disambiguate the scope zone for the next hop (if necessary).
216 if ((ifa = ip6_getdstifaddr(m)) == NULL)
218 if (in6_setscope(nextaddr, ifa->ia_ifp, NULL) != 0) {
219 V_ip6stat.ip6s_badscope++;
224 * Swap the IPv6 destination address and nextaddr. Forward the packet.
227 *nextaddr = ip6->ip6_dst;
228 in6_clearscope(nextaddr); /* XXX */
229 ip6->ip6_dst = tmpaddr;
231 #ifdef COMPAT_RFC1883
232 if (rh0->ip6r0_slmap[index / 8] & (1 << (7 - (index % 8))))
233 ip6_forward(m, IPV6_SRCRT_NEIGHBOR);
235 ip6_forward(m, IPV6_SRCRT_NOTNEIGHBOR);
240 return (-1); /* m would be freed in ip6_forward() */