Annotation of src/sys/netinet6/route6.c, Revision 1.15
1.15 ! christos 1: /* $NetBSD: route6.c,v 1.14 2006/01/21 00:15:37 rpaulo Exp $ */
1.8 itojun 2: /* $KAME: route6.c,v 1.22 2000/12/03 00:54:00 itojun Exp $ */
1.3 thorpej 3:
1.2 itojun 4: /*
5: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6: * All rights reserved.
1.7 itojun 7: *
1.2 itojun 8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
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
15: * documentation and/or other materials provided with the distribution.
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.
1.7 itojun 19: *
1.2 itojun 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
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
1.10 lukem 32:
33: #include <sys/cdefs.h>
1.15 ! christos 34: __KERNEL_RCSID(0, "$NetBSD: route6.c,v 1.14 2006/01/21 00:15:37 rpaulo Exp $");
1.2 itojun 35:
36: #include <sys/param.h>
37: #include <sys/mbuf.h>
38: #include <sys/socket.h>
1.4 itojun 39: #include <sys/systm.h>
1.8 itojun 40: #include <sys/queue.h>
1.2 itojun 41:
42: #include <net/if.h>
43:
44: #include <netinet/in.h>
1.4 itojun 45: #include <netinet6/in6_var.h>
1.6 itojun 46: #include <netinet/ip6.h>
1.2 itojun 47: #include <netinet6/ip6_var.h>
1.14 rpaulo 48: #include <netinet6/scope6_var.h>
1.2 itojun 49:
50: #include <netinet/icmp6.h>
51:
1.8 itojun 52: static int ip6_rthdr0 __P((struct mbuf *, struct ip6_hdr *,
53: struct ip6_rthdr0 *));
1.2 itojun 54:
55: int
1.15 ! christos 56: route6_input(struct mbuf **mp, int *offp, int proto __unused)
1.2 itojun 57: {
1.8 itojun 58: struct ip6_hdr *ip6;
59: struct mbuf *m = *mp;
60: struct ip6_rthdr *rh;
1.2 itojun 61: int off = *offp, rhlen;
62:
1.4 itojun 63: ip6 = mtod(m, struct ip6_hdr *);
64: IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
65: if (rh == NULL) {
66: ip6stat.ip6s_tooshort++;
67: return IPPROTO_DONE;
68: }
1.2 itojun 69:
1.8 itojun 70: switch (rh->ip6r_type) {
71: case IPV6_RTHDR_TYPE_0:
72: rhlen = (rh->ip6r_len + 1) << 3;
73: /*
74: * note on option length:
75: * maximum rhlen: 2048
76: * max mbuf m_pulldown can handle: MCLBYTES == usually 2048
77: * so, here we are assuming that m_pulldown can handle
78: * rhlen == 2048 case. this may not be a good thing to
79: * assume - we may want to avoid pulling it up altogether.
80: */
81: IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, rhlen);
82: if (rh == NULL) {
1.4 itojun 83: ip6stat.ip6s_tooshort++;
84: return IPPROTO_DONE;
1.8 itojun 85: }
86: if (ip6_rthdr0(m, ip6, (struct ip6_rthdr0 *)rh))
1.11 itojun 87: return (IPPROTO_DONE);
1.8 itojun 88: break;
89: default:
90: /* unknown routing type */
91: if (rh->ip6r_segleft == 0) {
92: rhlen = (rh->ip6r_len + 1) << 3;
93: break; /* Final dst. Just ignore the header. */
94: }
95: ip6stat.ip6s_badoptions++;
96: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
97: (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
1.11 itojun 98: return (IPPROTO_DONE);
1.2 itojun 99: }
100:
101: *offp += rhlen;
1.11 itojun 102: return (rh->ip6r_nxt);
1.2 itojun 103: }
104:
105: /*
106: * Type0 routing header processing
1.13 itojun 107: *
108: * RFC2292 backward compatibility warning: no support for strict/loose bitmap,
109: * as it was dropped between RFC1883 and RFC2460.
1.2 itojun 110: */
111: static int
112: ip6_rthdr0(m, ip6, rh0)
113: struct mbuf *m;
114: struct ip6_hdr *ip6;
115: struct ip6_rthdr0 *rh0;
116: {
117: int addrs, index;
118: struct in6_addr *nextaddr, tmpaddr;
1.14 rpaulo 119: struct in6_ifaddr *ifa;
1.2 itojun 120:
121: if (rh0->ip6r0_segleft == 0)
1.11 itojun 122: return (0);
1.2 itojun 123:
124: if (rh0->ip6r0_len % 2
125: #ifdef COMPAT_RFC1883
126: || rh0->ip6r0_len > 46
127: #endif
128: ) {
129: /*
130: * Type 0 routing header can't contain more than 23 addresses.
1.9 itojun 131: * RFC 2462: this limitation was removed since strict/loose
1.2 itojun 132: * bitmap field was deleted.
133: */
134: ip6stat.ip6s_badoptions++;
135: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
136: (caddr_t)&rh0->ip6r0_len - (caddr_t)ip6);
1.11 itojun 137: return (-1);
1.2 itojun 138: }
139:
140: if ((addrs = rh0->ip6r0_len / 2) < rh0->ip6r0_segleft) {
141: ip6stat.ip6s_badoptions++;
142: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
143: (caddr_t)&rh0->ip6r0_segleft - (caddr_t)ip6);
1.11 itojun 144: return (-1);
1.2 itojun 145: }
146:
147: index = addrs - rh0->ip6r0_segleft;
148: rh0->ip6r0_segleft--;
1.13 itojun 149: nextaddr = ((struct in6_addr *)(rh0 + 1)) + index;
1.2 itojun 150:
1.5 itojun 151: /*
152: * reject invalid addresses. be proactive about malicious use of
153: * IPv4 mapped/compat address.
154: * XXX need more checks?
155: */
1.2 itojun 156: if (IN6_IS_ADDR_MULTICAST(nextaddr) ||
1.5 itojun 157: IN6_IS_ADDR_UNSPECIFIED(nextaddr) ||
158: IN6_IS_ADDR_V4MAPPED(nextaddr) ||
159: IN6_IS_ADDR_V4COMPAT(nextaddr)) {
160: ip6stat.ip6s_badoptions++;
1.13 itojun 161: goto bad;
1.5 itojun 162: }
163: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
164: IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst) ||
165: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst) ||
1.7 itojun 166: IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
1.2 itojun 167: ip6stat.ip6s_badoptions++;
1.13 itojun 168: goto bad;
1.2 itojun 169: }
170:
171: /*
1.14 rpaulo 172: * Determine the scope zone of the next hop, based on the interface
173: * of the current hop. [RFC4007, Section 9]
174: * Then disambiguate the scope zone for the next hop (if necessary).
175: */
176: if ((ifa = ip6_getdstifaddr(m)) == NULL)
177: goto bad;
178: if (in6_setscope(nextaddr, ifa->ia_ifp, NULL) != 0) {
179: ip6stat.ip6s_badscope++;
180: goto bad;
181: }
182:
183: /*
1.2 itojun 184: * Swap the IPv6 destination address and nextaddr. Forward the packet.
185: */
186: tmpaddr = *nextaddr;
187: *nextaddr = ip6->ip6_dst;
1.14 rpaulo 188: in6_clearscope(nextaddr); /* XXX */
1.2 itojun 189: ip6->ip6_dst = tmpaddr;
190:
191: #ifdef COMPAT_RFC1883
192: if (rh0->ip6r0_slmap[index / 8] & (1 << (7 - (index % 8))))
193: ip6_forward(m, IPV6_SRCRT_NEIGHBOR);
194: else
195: ip6_forward(m, IPV6_SRCRT_NOTNEIGHBOR);
196: #else
197: ip6_forward(m, 1);
198: #endif
1.7 itojun 199:
1.11 itojun 200: return (-1); /* m would be freed in ip6_forward() */
1.13 itojun 201:
202: bad:
203: m_freem(m);
204: return (-1);
1.2 itojun 205: }
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