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route6.c (105194) route6.c (120856)
1/* $FreeBSD: head/sys/netinet6/route6.c 105194 2002-10-16 01:54:46Z sam $ */
1/* $FreeBSD: head/sys/netinet6/route6.c 120856 2003-10-06 14:02:09Z ume $ */
2/* $KAME: route6.c,v 1.24 2001/03/14 03:07:05 itojun Exp $ */
3
4/*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions

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106 */
107 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, rhlen);
108 if (rh == NULL) {
109 ip6stat.ip6s_tooshort++;
110 return IPPROTO_DONE;
111 }
112#endif
113 if (ip6_rthdr0(m, ip6, (struct ip6_rthdr0 *)rh))
2/* $KAME: route6.c,v 1.24 2001/03/14 03:07:05 itojun Exp $ */
3
4/*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions

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106 */
107 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, rhlen);
108 if (rh == NULL) {
109 ip6stat.ip6s_tooshort++;
110 return IPPROTO_DONE;
111 }
112#endif
113 if (ip6_rthdr0(m, ip6, (struct ip6_rthdr0 *)rh))
114 return(IPPROTO_DONE);
114 return (IPPROTO_DONE);
115 break;
116 default:
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. */
121 }
122 ip6stat.ip6s_badoptions++;
123 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
124 (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
115 break;
116 default:
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. */
121 }
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);
125 return (IPPROTO_DONE);
126 }
127
128 *offp += rhlen;
126 }
127
128 *offp += rhlen;
129 return(rh->ip6r_nxt);
129 return (rh->ip6r_nxt);
130}
131
132/*
133 * Type0 routing header processing
134 *
135 * RFC2292 backward compatibility warning: no support for strict/loose bitmap,
136 * as it was dropped between RFC1883 and RFC2460.
137 */
138static int
139ip6_rthdr0(m, ip6, rh0)
140 struct mbuf *m;
141 struct ip6_hdr *ip6;
142 struct ip6_rthdr0 *rh0;
143{
144 int addrs, index;
145 struct in6_addr *nextaddr, tmpaddr;
146
147 if (rh0->ip6r0_segleft == 0)
130}
131
132/*
133 * Type0 routing header processing
134 *
135 * RFC2292 backward compatibility warning: no support for strict/loose bitmap,
136 * as it was dropped between RFC1883 and RFC2460.
137 */
138static int
139ip6_rthdr0(m, ip6, rh0)
140 struct mbuf *m;
141 struct ip6_hdr *ip6;
142 struct ip6_rthdr0 *rh0;
143{
144 int addrs, index;
145 struct in6_addr *nextaddr, tmpaddr;
146
147 if (rh0->ip6r0_segleft == 0)
148 return(0);
148 return (0);
149
150 if (rh0->ip6r0_len % 2
151#ifdef COMPAT_RFC1883
152 || rh0->ip6r0_len > 46
153#endif
154 ) {
155 /*
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.
159 */
160 ip6stat.ip6s_badoptions++;
161 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
162 (caddr_t)&rh0->ip6r0_len - (caddr_t)ip6);
149
150 if (rh0->ip6r0_len % 2
151#ifdef COMPAT_RFC1883
152 || rh0->ip6r0_len > 46
153#endif
154 ) {
155 /*
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.
159 */
160 ip6stat.ip6s_badoptions++;
161 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
162 (caddr_t)&rh0->ip6r0_len - (caddr_t)ip6);
163 return(-1);
163 return (-1);
164 }
165
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);
164 }
165
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);
170 return(-1);
170 return (-1);
171 }
172
173 index = addrs - rh0->ip6r0_segleft;
174 rh0->ip6r0_segleft--;
175 /* note that ip6r0_addr does not exist in RFC2292bis */
176 nextaddr = rh0->ip6r0_addr + index;
177
178 /*
179 * reject invalid addresses. be proactive about malicious use of
180 * IPv4 mapped/compat address.
181 * XXX need more checks?
182 */
183 if (IN6_IS_ADDR_MULTICAST(nextaddr) ||
184 IN6_IS_ADDR_UNSPECIFIED(nextaddr) ||
185 IN6_IS_ADDR_V4MAPPED(nextaddr) ||
186 IN6_IS_ADDR_V4COMPAT(nextaddr)) {
187 ip6stat.ip6s_badoptions++;
188 m_freem(m);
171 }
172
173 index = addrs - rh0->ip6r0_segleft;
174 rh0->ip6r0_segleft--;
175 /* note that ip6r0_addr does not exist in RFC2292bis */
176 nextaddr = rh0->ip6r0_addr + index;
177
178 /*
179 * reject invalid addresses. be proactive about malicious use of
180 * IPv4 mapped/compat address.
181 * XXX need more checks?
182 */
183 if (IN6_IS_ADDR_MULTICAST(nextaddr) ||
184 IN6_IS_ADDR_UNSPECIFIED(nextaddr) ||
185 IN6_IS_ADDR_V4MAPPED(nextaddr) ||
186 IN6_IS_ADDR_V4COMPAT(nextaddr)) {
187 ip6stat.ip6s_badoptions++;
188 m_freem(m);
189 return(-1);
189 return (-1);
190 }
191 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
192 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst) ||
193 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst) ||
194 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
195 ip6stat.ip6s_badoptions++;
196 m_freem(m);
190 }
191 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
192 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst) ||
193 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst) ||
194 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
195 ip6stat.ip6s_badoptions++;
196 m_freem(m);
197 return(-1);
197 return (-1);
198 }
199
200 /*
201 * Swap the IPv6 destination address and nextaddr. Forward the packet.
202 */
203 tmpaddr = *nextaddr;
204 *nextaddr = ip6->ip6_dst;
205 if (IN6_IS_ADDR_LINKLOCAL(nextaddr))

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212 if (rh0->ip6r0_slmap[index / 8] & (1 << (7 - (index % 8))))
213 ip6_forward(m, IPV6_SRCRT_NEIGHBOR);
214 else
215 ip6_forward(m, IPV6_SRCRT_NOTNEIGHBOR);
216#else
217 ip6_forward(m, 1);
218#endif
219
198 }
199
200 /*
201 * Swap the IPv6 destination address and nextaddr. Forward the packet.
202 */
203 tmpaddr = *nextaddr;
204 *nextaddr = ip6->ip6_dst;
205 if (IN6_IS_ADDR_LINKLOCAL(nextaddr))

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212 if (rh0->ip6r0_slmap[index / 8] & (1 << (7 - (index % 8))))
213 ip6_forward(m, IPV6_SRCRT_NEIGHBOR);
214 else
215 ip6_forward(m, IPV6_SRCRT_NOTNEIGHBOR);
216#else
217 ip6_forward(m, 1);
218#endif
219
220 return(-1); /* m would be freed in ip6_forward() */
220 return (-1); /* m would be freed in ip6_forward() */
221}
221}