2 /* $KAME: route6.c,v 1.24 2001/03/14 03:07:05 itojun Exp $ */
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
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16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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34 #include "opt_inet6.h"
36 #include <sys/param.h>
38 #include <sys/socket.h>
39 #include <sys/systm.h>
40 #include <sys/queue.h>
44 #include <netinet/in.h>
45 #include <netinet6/in6_var.h>
46 #include <netinet/ip6.h>
47 #include <netinet6/ip6_var.h>
48 #include <netinet6/scope6_var.h>
50 #include <netinet/icmp6.h>
53 static int ip6_rthdr0 __P((struct mbuf *, struct ip6_hdr *,
54 struct ip6_rthdr0 *));
56 #endif /* Disable route header processing. */
59 route6_input(mp, offp, proto)
61 int *offp, proto; /* proto is unused */
66 int off = *offp, rhlen;
69 ip6a = ip6_findaux(m);
71 /* XXX reject home-address option before rthdr */
72 if (ip6a->ip6a_flags & IP6A_SWAP) {
73 ip6stat.ip6s_badoptions++;
80 IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE);
81 ip6 = mtod(m, struct ip6_hdr *);
82 rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
84 ip6 = mtod(m, struct ip6_hdr *);
85 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
87 ip6stat.ip6s_tooshort++;
92 switch (rh->ip6r_type) {
94 case IPV6_RTHDR_TYPE_0:
95 rhlen = (rh->ip6r_len + 1) << 3;
98 * note on option length:
99 * due to IP6_EXTHDR_CHECK assumption, we cannot handle
100 * very big routing header (max rhlen == 2048).
102 IP6_EXTHDR_CHECK(m, off, rhlen, IPPROTO_DONE);
105 * note on option length:
106 * maximum rhlen: 2048
107 * max mbuf m_pulldown can handle: MCLBYTES == usually 2048
108 * so, here we are assuming that m_pulldown can handle
109 * rhlen == 2048 case. this may not be a good thing to
110 * assume - we may want to avoid pulling it up altogether.
112 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, rhlen);
114 ip6stat.ip6s_tooshort++;
118 if (ip6_rthdr0(m, ip6, (struct ip6_rthdr0 *)rh))
119 return (IPPROTO_DONE);
121 #endif /* Disable route header 0 */
123 /* unknown routing type */
124 if (rh->ip6r_segleft == 0) {
125 rhlen = (rh->ip6r_len + 1) << 3;
126 break; /* Final dst. Just ignore the header. */
128 ip6stat.ip6s_badoptions++;
129 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
130 (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
131 return (IPPROTO_DONE);
135 return (rh->ip6r_nxt);
139 * Type0 routing header processing
141 * RFC2292 backward compatibility warning: no support for strict/loose bitmap,
142 * as it was dropped between RFC1883 and RFC2460.
146 ip6_rthdr0(m, ip6, rh0)
149 struct ip6_rthdr0 *rh0;
152 struct in6_addr *nextaddr, tmpaddr;
153 struct in6_ifaddr *ifa;
155 if (rh0->ip6r0_segleft == 0)
158 if (rh0->ip6r0_len % 2
159 #ifdef COMPAT_RFC1883
160 || rh0->ip6r0_len > 46
164 * Type 0 routing header can't contain more than 23 addresses.
165 * RFC 2462: this limitation was removed since strict/loose
166 * bitmap field was deleted.
168 ip6stat.ip6s_badoptions++;
169 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
170 (caddr_t)&rh0->ip6r0_len - (caddr_t)ip6);
174 if ((addrs = rh0->ip6r0_len / 2) < rh0->ip6r0_segleft) {
175 ip6stat.ip6s_badoptions++;
176 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
177 (caddr_t)&rh0->ip6r0_segleft - (caddr_t)ip6);
181 index = addrs - rh0->ip6r0_segleft;
182 rh0->ip6r0_segleft--;
183 nextaddr = ((struct in6_addr *)(rh0 + 1)) + index;
186 * reject invalid addresses. be proactive about malicious use of
187 * IPv4 mapped/compat address.
188 * XXX need more checks?
190 if (IN6_IS_ADDR_MULTICAST(nextaddr) ||
191 IN6_IS_ADDR_UNSPECIFIED(nextaddr) ||
192 IN6_IS_ADDR_V4MAPPED(nextaddr) ||
193 IN6_IS_ADDR_V4COMPAT(nextaddr)) {
194 ip6stat.ip6s_badoptions++;
198 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
199 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst) ||
200 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst) ||
201 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
202 ip6stat.ip6s_badoptions++;
208 * Determine the scope zone of the next hop, based on the interface
209 * of the current hop. [RFC4007, Section 9]
210 * Then disambiguate the scope zone for the next hop (if necessary).
212 if ((ifa = ip6_getdstifaddr(m)) == NULL)
214 if (in6_setscope(nextaddr, ifa->ia_ifp, NULL) != 0) {
215 ip6stat.ip6s_badscope++;
220 * Swap the IPv6 destination address and nextaddr. Forward the packet.
223 *nextaddr = ip6->ip6_dst;
224 in6_clearscope(nextaddr); /* XXX */
225 ip6->ip6_dst = tmpaddr;
227 #ifdef COMPAT_RFC1883
228 if (rh0->ip6r0_slmap[index / 8] & (1 << (7 - (index % 8))))
229 ip6_forward(m, IPV6_SRCRT_NEIGHBOR);
231 ip6_forward(m, IPV6_SRCRT_NOTNEIGHBOR);
236 return (-1); /* m would be freed in ip6_forward() */