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route6.c (53541) route6.c (62587)
1/* $FreeBSD: head/sys/netinet6/route6.c 62587 2000-07-04 16:35:15Z itojun $ */
2/* $KAME: route6.c,v 1.15 2000/06/23 16:18:20 itojun Exp $ */
3
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

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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.
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
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright

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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.
28 *
29 * $FreeBSD: head/sys/netinet6/route6.c 53541 1999-11-22 02:45:11Z shin $
30 */
31
31 */
32
33#include "opt_inet.h"
34#include "opt_inet6.h"
35
32#include <sys/param.h>
33#include <sys/mbuf.h>
34#include <sys/socket.h>
36#include <sys/param.h>
37#include <sys/mbuf.h>
38#include <sys/socket.h>
39#include <sys/systm.h>
35
36#include <net/if.h>
37
38#include <netinet/in.h>
40
41#include <net/if.h>
42
43#include <netinet/in.h>
39#include <netinet6/in6.h>
40#include <netinet6/in6_var.h>
44#include <netinet6/in6_var.h>
41#include <netinet6/ip6.h>
45#include
42#include <netinet6/ip6_var.h>
43
44#include <netinet/icmp6.h>
45
46#include <netinet6/ip6_var.h>
47
48#include <netinet/icmp6.h>
49
46static int ip6_rthdr0 __P((struct mbuf *, struct ip6_hdr *, struct ip6_rthdr0 *));
50static int ip6_rthdr0 __P((struct mbuf *, struct ip6_hdr *,
51 struct ip6_rthdr0 *));
47
48int
49route6_input(mp, offp, proto)
50 struct mbuf **mp;
51 int *offp, proto; /* proto is unused */
52{
53 register struct ip6_hdr *ip6;
54 register struct mbuf *m = *mp;
55 register struct ip6_rthdr *rh;
56 int off = *offp, rhlen;
57
52
53int
54route6_input(mp, offp, proto)
55 struct mbuf **mp;
56 int *offp, proto; /* proto is unused */
57{
58 register struct ip6_hdr *ip6;
59 register struct mbuf *m = *mp;
60 register struct ip6_rthdr *rh;
61 int off = *offp, rhlen;
62
63#ifndef PULLDOWN_TEST
58 IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE);
59 ip6 = mtod(m, struct ip6_hdr *);
60 rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
64 IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE);
65 ip6 = mtod(m, struct ip6_hdr *);
66 rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
67#else
68 ip6 = mtod(m, struct ip6_hdr *);
69 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
70 if (rh == NULL) {
71 ip6stat.ip6s_tooshort++;
72 return IPPROTO_DONE;
73 }
74#endif
61
75
62 switch(rh->ip6r_type) {
63 case IPV6_RTHDR_TYPE_0:
64 rhlen = (rh->ip6r_len + 1) << 3;
65 IP6_EXTHDR_CHECK(m, off, rhlen, IPPROTO_DONE);
66 if (ip6_rthdr0(m, ip6, (struct ip6_rthdr0 *)rh))
67 return(IPPROTO_DONE);
68 break;
69 default:
70 /* unknown routing type */
71 if (rh->ip6r_segleft == 0) {
72 rhlen = (rh->ip6r_len + 1) << 3;
73 break; /* Final dst. Just ignore the header. */
74 }
75 ip6stat.ip6s_badoptions++;
76 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
77 (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
78 return(IPPROTO_DONE);
76 switch (rh->ip6r_type) {
77 case IPV6_RTHDR_TYPE_0:
78 rhlen = (rh->ip6r_len + 1) << 3;
79#ifndef PULLDOWN_TEST
80 /*
81 * note on option length:
82 * due to IP6_EXTHDR_CHECK assumption, we cannot handle
83 * very big routing header (max rhlen == 2048).
84 */
85 IP6_EXTHDR_CHECK(m, off, rhlen, IPPROTO_DONE);
86#else
87 /*
88 * note on option length:
89 * maximum rhlen: 2048
90 * max mbuf m_pulldown can handle: MCLBYTES == usually 2048
91 * so, here we are assuming that m_pulldown can handle
92 * rhlen == 2048 case. this may not be a good thing to
93 * assume - we may want to avoid pulling it up altogether.
94 */
95 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, rhlen);
96 if (rh == NULL) {
97 ip6stat.ip6s_tooshort++;
98 return IPPROTO_DONE;
99 }
100#endif
101 if (ip6_rthdr0(m, ip6, (struct ip6_rthdr0 *)rh))
102 return(IPPROTO_DONE);
103 break;
104 default:
105 /* unknown routing type */
106 if (rh->ip6r_segleft == 0) {
107 rhlen = (rh->ip6r_len + 1) << 3;
108 break; /* Final dst. Just ignore the header. */
109 }
110 ip6stat.ip6s_badoptions++;
111 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
112 (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
113 return(IPPROTO_DONE);
79 }
80
81 *offp += rhlen;
82 return(rh->ip6r_nxt);
83}
84
85/*
86 * Type0 routing header processing

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117 ip6stat.ip6s_badoptions++;
118 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
119 (caddr_t)&rh0->ip6r0_segleft - (caddr_t)ip6);
120 return(-1);
121 }
122
123 index = addrs - rh0->ip6r0_segleft;
124 rh0->ip6r0_segleft--;
114 }
115
116 *offp += rhlen;
117 return(rh->ip6r_nxt);
118}
119
120/*
121 * Type0 routing header processing

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152 ip6stat.ip6s_badoptions++;
153 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
154 (caddr_t)&rh0->ip6r0_segleft - (caddr_t)ip6);
155 return(-1);
156 }
157
158 index = addrs - rh0->ip6r0_segleft;
159 rh0->ip6r0_segleft--;
125 nextaddr = rh0->ip6r0_addr + index;
160 nextaddr = ((struct in6_addr *)(rh0 + 1)) + index;
126
161
162 /*
163 * reject invalid addresses. be proactive about malicious use of
164 * IPv4 mapped/compat address.
165 * XXX need more checks?
166 */
127 if (IN6_IS_ADDR_MULTICAST(nextaddr) ||
167 if (IN6_IS_ADDR_MULTICAST(nextaddr) ||
128 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
168 IN6_IS_ADDR_UNSPECIFIED(nextaddr) ||
169 IN6_IS_ADDR_V4MAPPED(nextaddr) ||
170 IN6_IS_ADDR_V4COMPAT(nextaddr)) {
129 ip6stat.ip6s_badoptions++;
130 m_freem(m);
131 return(-1);
132 }
171 ip6stat.ip6s_badoptions++;
172 m_freem(m);
173 return(-1);
174 }
175 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
176 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst) ||
177 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst) ||
178 IN6_IS_ADDR_V4COMPAT(nextaddr)) {
179 ip6stat.ip6s_badoptions++;
180 m_freem(m);
181 return(-1);
182 }
133
134 /*
135 * Swap the IPv6 destination address and nextaddr. Forward the packet.
136 */
137 tmpaddr = *nextaddr;
138 *nextaddr = ip6->ip6_dst;
139 if (IN6_IS_ADDR_LINKLOCAL(nextaddr))
140 nextaddr->s6_addr16[1] = 0;

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184 /*
185 * Swap the IPv6 destination address and nextaddr. Forward the packet.
186 */
187 tmpaddr = *nextaddr;
188 *nextaddr = ip6->ip6_dst;
189 if (IN6_IS_ADDR_LINKLOCAL(nextaddr))
190 nextaddr->s6_addr16[1] = 0;

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