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
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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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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>
49 #include <netinet/icmp6.h>
51 static int ip6_rthdr0 __P((struct mbuf *, struct ip6_hdr *,
52 struct ip6_rthdr0 *));
55 route6_input(mp, offp, proto)
57 int *offp, proto; /* proto is unused */
62 int off = *offp, rhlen;
67 struct ip6aux *ip6a = mtod(n, struct ip6aux *);
68 /* XXX reject home-address option before rthdr */
69 if (ip6a->ip6a_flags & IP6A_SWAP) {
70 ip6stat.ip6s_badoptions++;
77 IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE);
78 ip6 = mtod(m, struct ip6_hdr *);
79 rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
81 ip6 = mtod(m, struct ip6_hdr *);
82 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
84 ip6stat.ip6s_tooshort++;
89 switch (rh->ip6r_type) {
90 case IPV6_RTHDR_TYPE_0:
91 rhlen = (rh->ip6r_len + 1) << 3;
94 * note on option length:
95 * due to IP6_EXTHDR_CHECK assumption, we cannot handle
96 * very big routing header (max rhlen == 2048).
98 IP6_EXTHDR_CHECK(m, off, rhlen, IPPROTO_DONE);
101 * note on option length:
102 * maximum rhlen: 2048
103 * max mbuf m_pulldown can handle: MCLBYTES == usually 2048
104 * so, here we are assuming that m_pulldown can handle
105 * rhlen == 2048 case. this may not be a good thing to
106 * assume - we may want to avoid pulling it up altogether.
108 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, rhlen);
110 ip6stat.ip6s_tooshort++;
114 if (ip6_rthdr0(m, ip6, (struct ip6_rthdr0 *)rh))
115 return(IPPROTO_DONE);
118 /* unknown routing type */
119 if (rh->ip6r_segleft == 0) {
120 rhlen = (rh->ip6r_len + 1) << 3;
121 break; /* Final dst. Just ignore the header. */
123 ip6stat.ip6s_badoptions++;
124 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
125 (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
126 return(IPPROTO_DONE);
130 return(rh->ip6r_nxt);
134 * Type0 routing header processing
136 * RFC2292 backward compatibility warning: no support for strict/loose bitmap,
137 * as it was dropped between RFC1883 and RFC2460.
140 ip6_rthdr0(m, ip6, rh0)
143 struct ip6_rthdr0 *rh0;
146 struct in6_addr *nextaddr, tmpaddr;
148 if (rh0->ip6r0_segleft == 0)
151 if (rh0->ip6r0_len % 2
152 #ifdef COMPAT_RFC1883
153 || rh0->ip6r0_len > 46
157 * Type 0 routing header can't contain more than 23 addresses.
158 * RFC 2462: this limitation was removed since strict/loose
159 * bitmap field was deleted.
161 ip6stat.ip6s_badoptions++;
162 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
163 (caddr_t)&rh0->ip6r0_len - (caddr_t)ip6);
167 if ((addrs = rh0->ip6r0_len / 2) < rh0->ip6r0_segleft) {
168 ip6stat.ip6s_badoptions++;
169 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
170 (caddr_t)&rh0->ip6r0_segleft - (caddr_t)ip6);
174 index = addrs - rh0->ip6r0_segleft;
175 rh0->ip6r0_segleft--;
176 /* note that ip6r0_addr does not exist in RFC2292bis */
177 nextaddr = rh0->ip6r0_addr + index;
180 * reject invalid addresses. be proactive about malicious use of
181 * IPv4 mapped/compat address.
182 * XXX need more checks?
184 if (IN6_IS_ADDR_MULTICAST(nextaddr) ||
185 IN6_IS_ADDR_UNSPECIFIED(nextaddr) ||
186 IN6_IS_ADDR_V4MAPPED(nextaddr) ||
187 IN6_IS_ADDR_V4COMPAT(nextaddr)) {
188 ip6stat.ip6s_badoptions++;
192 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
193 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst) ||
194 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst) ||
195 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
196 ip6stat.ip6s_badoptions++;
202 * Swap the IPv6 destination address and nextaddr. Forward the packet.
205 *nextaddr = ip6->ip6_dst;
206 if (IN6_IS_ADDR_LINKLOCAL(nextaddr))
207 nextaddr->s6_addr16[1] = 0;
208 ip6->ip6_dst = tmpaddr;
209 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst))
210 ip6->ip6_dst.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index);
212 #ifdef COMPAT_RFC1883
213 if (rh0->ip6r0_slmap[index / 8] & (1 << (7 - (index % 8))))
214 ip6_forward(m, IPV6_SRCRT_NEIGHBOR);
216 ip6_forward(m, IPV6_SRCRT_NOTNEIGHBOR);
221 return(-1); /* m would be freed in ip6_forward() */