FreeBSD/Linux Kernel Cross Reference
sys/netinet6/route6.c
1 /*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
16 *
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
27 * SUCH DAMAGE.
28 *
29 * $KAME: route6.c,v 1.24 2001/03/14 03:07:05 itojun Exp $
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD: src/sys/netinet6/route6.c,v 1.18 2008/12/02 21:37:28 bz Exp $");
34
35 #include "opt_inet.h"
36 #include "opt_inet6.h"
37
38 #include <sys/param.h>
39 #include <sys/mbuf.h>
40 #include <sys/socket.h>
41 #include <sys/systm.h>
42 #include <sys/queue.h>
43 #include <sys/vimage.h>
44
45 #include <net/if.h>
46
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>
52
53 #include <netinet/icmp6.h>
54 #include <netinet6/vinet6.h>
55
56 #if 0
57 static int ip6_rthdr0 __P((struct mbuf *, struct ip6_hdr *,
58 struct ip6_rthdr0 *));
59
60 #endif /* Disable route header processing. */
61
62 /*
63 * proto - is unused
64 */
65
66 int
67 route6_input(struct mbuf **mp, int *offp, int proto)
68 {
69 INIT_VNET_INET6(curvnet);
70 struct ip6_hdr *ip6;
71 struct mbuf *m = *mp;
72 struct ip6_rthdr *rh;
73 int off = *offp, rhlen;
74 struct ip6aux *ip6a;
75
76 ip6a = ip6_findaux(m);
77 if (ip6a) {
78 /* XXX reject home-address option before rthdr */
79 if (ip6a->ip6a_flags & IP6A_SWAP) {
80 V_ip6stat.ip6s_badoptions++;
81 m_freem(m);
82 return IPPROTO_DONE;
83 }
84 }
85
86 #ifndef PULLDOWN_TEST
87 IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE);
88 ip6 = mtod(m, struct ip6_hdr *);
89 rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
90 #else
91 ip6 = mtod(m, struct ip6_hdr *);
92 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
93 if (rh == NULL) {
94 V_ip6stat.ip6s_tooshort++;
95 return IPPROTO_DONE;
96 }
97 #endif
98
99 switch (rh->ip6r_type) {
100 #if 0
101 case IPV6_RTHDR_TYPE_0:
102 rhlen = (rh->ip6r_len + 1) << 3;
103 #ifndef PULLDOWN_TEST
104 /*
105 * note on option length:
106 * due to IP6_EXTHDR_CHECK assumption, we cannot handle
107 * very big routing header (max rhlen == 2048).
108 */
109 IP6_EXTHDR_CHECK(m, off, rhlen, IPPROTO_DONE);
110 #else
111 /*
112 * note on option length:
113 * maximum rhlen: 2048
114 * max mbuf m_pulldown can handle: MCLBYTES == usually 2048
115 * so, here we are assuming that m_pulldown can handle
116 * rhlen == 2048 case. this may not be a good thing to
117 * assume - we may want to avoid pulling it up altogether.
118 */
119 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, rhlen);
120 if (rh == NULL) {
121 V_ip6stat.ip6s_tooshort++;
122 return IPPROTO_DONE;
123 }
124 #endif
125 if (ip6_rthdr0(m, ip6, (struct ip6_rthdr0 *)rh))
126 return (IPPROTO_DONE);
127 break;
128 #endif /* Disable route header 0 */
129 default:
130 /* unknown routing type */
131 if (rh->ip6r_segleft == 0) {
132 rhlen = (rh->ip6r_len + 1) << 3;
133 break; /* Final dst. Just ignore the header. */
134 }
135 V_ip6stat.ip6s_badoptions++;
136 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
137 (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
138 return (IPPROTO_DONE);
139 }
140
141 *offp += rhlen;
142 return (rh->ip6r_nxt);
143 }
144
145 /*
146 * Type0 routing header processing
147 *
148 * RFC2292 backward compatibility warning: no support for strict/loose bitmap,
149 * as it was dropped between RFC1883 and RFC2460.
150 */
151 #if 0
152 static int
153 ip6_rthdr0(struct mbuf *m, struct ip6_hdr *ip6, struct ip6_rthdr0 *rh0)
154 {
155 INIT_VNET_INET6(curvnet);
156 int addrs, index;
157 struct in6_addr *nextaddr, tmpaddr;
158 struct in6_ifaddr *ifa;
159
160 if (rh0->ip6r0_segleft == 0)
161 return (0);
162
163 if (rh0->ip6r0_len % 2
164 #ifdef COMPAT_RFC1883
165 || rh0->ip6r0_len > 46
166 #endif
167 ) {
168 /*
169 * Type 0 routing header can't contain more than 23 addresses.
170 * RFC 2462: this limitation was removed since strict/loose
171 * bitmap field was deleted.
172 */
173 V_ip6stat.ip6s_badoptions++;
174 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
175 (caddr_t)&rh0->ip6r0_len - (caddr_t)ip6);
176 return (-1);
177 }
178
179 if ((addrs = rh0->ip6r0_len / 2) < rh0->ip6r0_segleft) {
180 V_ip6stat.ip6s_badoptions++;
181 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
182 (caddr_t)&rh0->ip6r0_segleft - (caddr_t)ip6);
183 return (-1);
184 }
185
186 index = addrs - rh0->ip6r0_segleft;
187 rh0->ip6r0_segleft--;
188 nextaddr = ((struct in6_addr *)(rh0 + 1)) + index;
189
190 /*
191 * reject invalid addresses. be proactive about malicious use of
192 * IPv4 mapped/compat address.
193 * XXX need more checks?
194 */
195 if (IN6_IS_ADDR_MULTICAST(nextaddr) ||
196 IN6_IS_ADDR_UNSPECIFIED(nextaddr) ||
197 IN6_IS_ADDR_V4MAPPED(nextaddr) ||
198 IN6_IS_ADDR_V4COMPAT(nextaddr)) {
199 V_ip6stat.ip6s_badoptions++;
200 m_freem(m);
201 return (-1);
202 }
203 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
204 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst) ||
205 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst) ||
206 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
207 V_ip6stat.ip6s_badoptions++;
208 m_freem(m);
209 return (-1);
210 }
211
212 /*
213 * Determine the scope zone of the next hop, based on the interface
214 * of the current hop. [RFC4007, Section 9]
215 * Then disambiguate the scope zone for the next hop (if necessary).
216 */
217 if ((ifa = ip6_getdstifaddr(m)) == NULL)
218 goto bad;
219 if (in6_setscope(nextaddr, ifa->ia_ifp, NULL) != 0) {
220 V_ip6stat.ip6s_badscope++;
221 goto bad;
222 }
223
224 /*
225 * Swap the IPv6 destination address and nextaddr. Forward the packet.
226 */
227 tmpaddr = *nextaddr;
228 *nextaddr = ip6->ip6_dst;
229 in6_clearscope(nextaddr); /* XXX */
230 ip6->ip6_dst = tmpaddr;
231
232 #ifdef COMPAT_RFC1883
233 if (rh0->ip6r0_slmap[index / 8] & (1 << (7 - (index % 8))))
234 ip6_forward(m, IPV6_SRCRT_NEIGHBOR);
235 else
236 ip6_forward(m, IPV6_SRCRT_NOTNEIGHBOR);
237 #else
238 ip6_forward(m, 1);
239 #endif
240
241 return (-1); /* m would be freed in ip6_forward() */
242
243 bad:
244 m_freem(m);
245 return (-1);
246 }
247 #endif
248
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