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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17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
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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;
65 ip6a = ip6_findaux(m);
67 /* XXX reject home-address option before rthdr */
68 if (ip6a->ip6a_flags & IP6A_SWAP) {
69 ip6stat.ip6s_badoptions++;
76 IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE);
77 ip6 = mtod(m, struct ip6_hdr *);
78 rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
80 ip6 = mtod(m, struct ip6_hdr *);
81 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
83 ip6stat.ip6s_tooshort++;
88 switch (rh->ip6r_type) {
89 case IPV6_RTHDR_TYPE_0:
90 rhlen = (rh->ip6r_len + 1) << 3;
93 * note on option length:
94 * due to IP6_EXTHDR_CHECK assumption, we cannot handle
95 * very big routing header (max rhlen == 2048).
97 IP6_EXTHDR_CHECK(m, off, rhlen, IPPROTO_DONE);
100 * note on option length:
101 * maximum rhlen: 2048
102 * max mbuf m_pulldown can handle: MCLBYTES == usually 2048
103 * so, here we are assuming that m_pulldown can handle
104 * rhlen == 2048 case. this may not be a good thing to
105 * assume - we may want to avoid pulling it up altogether.
107 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, rhlen);
109 ip6stat.ip6s_tooshort++;
113 if (ip6_rthdr0(m, ip6, (struct ip6_rthdr0 *)rh))
114 return (IPPROTO_DONE);
117 /* unknown routing type */
118 if (rh->ip6r_segleft == 0) {
119 rhlen = (rh->ip6r_len + 1) << 3;
120 break; /* Final dst. Just ignore the header. */
122 ip6stat.ip6s_badoptions++;
123 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
124 (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
125 return (IPPROTO_DONE);
129 return (rh->ip6r_nxt);
133 * Type0 routing header processing
135 * RFC2292 backward compatibility warning: no support for strict/loose bitmap,
136 * as it was dropped between RFC1883 and RFC2460.
139 ip6_rthdr0(m, ip6, rh0)
142 struct ip6_rthdr0 *rh0;
145 struct in6_addr *nextaddr, tmpaddr;
147 if (rh0->ip6r0_segleft == 0)
150 if (rh0->ip6r0_len % 2
151 #ifdef COMPAT_RFC1883
152 || rh0->ip6r0_len > 46
156 * Type 0 routing header can't contain more than 23 addresses.
157 * RFC 2462: this limitation was removed since strict/loose
158 * bitmap field was deleted.
160 ip6stat.ip6s_badoptions++;
161 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
162 (caddr_t)&rh0->ip6r0_len - (caddr_t)ip6);
166 if ((addrs = rh0->ip6r0_len / 2) < rh0->ip6r0_segleft) {
167 ip6stat.ip6s_badoptions++;
168 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
169 (caddr_t)&rh0->ip6r0_segleft - (caddr_t)ip6);
173 index = addrs - rh0->ip6r0_segleft;
174 rh0->ip6r0_segleft--;
175 nextaddr = ((struct in6_addr *)(rh0 + 1)) + index;
178 * reject invalid addresses. be proactive about malicious use of
179 * IPv4 mapped/compat address.
180 * XXX need more checks?
182 if (IN6_IS_ADDR_MULTICAST(nextaddr) ||
183 IN6_IS_ADDR_UNSPECIFIED(nextaddr) ||
184 IN6_IS_ADDR_V4MAPPED(nextaddr) ||
185 IN6_IS_ADDR_V4COMPAT(nextaddr)) {
186 ip6stat.ip6s_badoptions++;
190 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
191 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst) ||
192 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst) ||
193 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
194 ip6stat.ip6s_badoptions++;
200 * Swap the IPv6 destination address and nextaddr. Forward the packet.
203 *nextaddr = ip6->ip6_dst;
204 if (IN6_IS_ADDR_LINKLOCAL(nextaddr))
205 nextaddr->s6_addr16[1] = 0;
206 ip6->ip6_dst = tmpaddr;
207 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst))
208 ip6->ip6_dst.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index);
210 #ifdef COMPAT_RFC1883
211 if (rh0->ip6r0_slmap[index / 8] & (1 << (7 - (index % 8))))
212 ip6_forward(m, IPV6_SRCRT_NEIGHBOR);
214 ip6_forward(m, IPV6_SRCRT_NOTNEIGHBOR);
219 return (-1); /* m would be freed in ip6_forward() */