Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/route6.c
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1 /* $NetBSD: route6.c,v 1.13.4.1 2007/06/04 19:24:35 bouyer Exp $ */ 2 /* $KAME: route6.c,v 1.22 2000/12/03 00:54:00 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 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. 19 * 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 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: route6.c,v 1.13.4.1 2007/06/04 19:24:35 bouyer Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/mbuf.h> 38 #include <sys/socket.h> 39 #include <sys/systm.h> 40 #include <sys/queue.h> 41 42 #include <net/if.h> 43 44 #include <netinet/in.h> 45 #include <netinet6/in6_var.h> 46 #include <netinet/ip6.h> 47 #include <netinet6/ip6_var.h> 48 49 #include <netinet/icmp6.h> 50 51 int ip6_rht0 = -1; /* disabled by default */ 52 53 static int ip6_rthdr0 __P((struct mbuf *, struct ip6_hdr *, 54 struct ip6_rthdr0 *)); 55 56 int 57 route6_input(mp, offp, proto) 58 struct mbuf **mp; 59 int *offp, proto; /* proto is unused */ 60 { 61 struct ip6_hdr *ip6; 62 struct mbuf *m = *mp; 63 struct ip6_rthdr *rh; 64 int off = *offp, rhlen; 65 66 ip6 = mtod(m, struct ip6_hdr *); 67 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh)); 68 if (rh == NULL) { 69 ip6stat.ip6s_tooshort++; 70 return IPPROTO_DONE; 71 } 72 73 switch (rh->ip6r_type) { 74 case IPV6_RTHDR_TYPE_0: 75 if ((ip6_forwarding && ip6_rht0 == 0) || ip6_rht0 > 0) { 76 rhlen = (rh->ip6r_len + 1) << 3; 77 /* 78 * note on option length: 79 * maximum rhlen: 2048 80 * max mbuf m_pulldown can handle: MCLBYTES == usually 81 * 2048 so, here we are assuming that m_pulldown can 82 * handle hlen == 2048 case. This may not be a good 83 * thing to assume - we may want to avoid pulling it 84 * up altogether. 85 */ 86 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, rhlen); 87 if (rh == NULL) { 88 ip6stat.ip6s_tooshort++; 89 return IPPROTO_DONE; 90 } 91 if (ip6_rthdr0(m, ip6, (struct ip6_rthdr0 *)rh)) 92 return IPPROTO_DONE; 93 break; 94 } 95 /*FALLTHROUGH*/ 96 default: 97 /* unknown routing type */ 98 if (rh->ip6r_segleft == 0) { 99 rhlen = (rh->ip6r_len + 1) << 3; 100 break; /* Final dst. Just ignore the header. */ 101 } 102 ip6stat.ip6s_badoptions++; 103 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 104 (caddr_t)&rh->ip6r_type - (caddr_t)ip6); 105 return (IPPROTO_DONE); 106 } 107 108 *offp += rhlen; 109 return (rh->ip6r_nxt); 110 } 111 112 /* 113 * Type0 routing header processing 114 * 115 * RFC2292 backward compatibility warning: no support for strict/loose bitmap, 116 * as it was dropped between RFC1883 and RFC2460. 117 */ 118 static int 119 ip6_rthdr0(m, ip6, rh0) 120 struct mbuf *m; 121 struct ip6_hdr *ip6; 122 struct ip6_rthdr0 *rh0; 123 { 124 int addrs, index; 125 struct in6_addr *nextaddr, tmpaddr; 126 127 if (rh0->ip6r0_segleft == 0) 128 return (0); 129 130 if (rh0->ip6r0_len % 2 131 #ifdef COMPAT_RFC1883 132 || rh0->ip6r0_len > 46 133 #endif 134 ) { 135 /* 136 * Type 0 routing header can't contain more than 23 addresses. 137 * RFC 2462: this limitation was removed since strict/loose 138 * bitmap field was deleted. 139 */ 140 ip6stat.ip6s_badoptions++; 141 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 142 (caddr_t)&rh0->ip6r0_len - (caddr_t)ip6); 143 return (-1); 144 } 145 146 if ((addrs = rh0->ip6r0_len / 2) < rh0->ip6r0_segleft) { 147 ip6stat.ip6s_badoptions++; 148 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 149 (caddr_t)&rh0->ip6r0_segleft - (caddr_t)ip6); 150 return (-1); 151 } 152 153 index = addrs - rh0->ip6r0_segleft; 154 rh0->ip6r0_segleft--; 155 nextaddr = ((struct in6_addr *)(rh0 + 1)) + index; 156 157 /* 158 * reject invalid addresses. be proactive about malicious use of 159 * IPv4 mapped/compat address. 160 * XXX need more checks? 161 */ 162 if (IN6_IS_ADDR_MULTICAST(nextaddr) || 163 IN6_IS_ADDR_UNSPECIFIED(nextaddr) || 164 IN6_IS_ADDR_V4MAPPED(nextaddr) || 165 IN6_IS_ADDR_V4COMPAT(nextaddr)) { 166 ip6stat.ip6s_badoptions++; 167 goto bad; 168 } 169 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 170 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst) || 171 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst) || 172 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 173 ip6stat.ip6s_badoptions++; 174 goto bad; 175 } 176 177 /* 178 * Swap the IPv6 destination address and nextaddr. Forward the packet. 179 */ 180 tmpaddr = *nextaddr; 181 *nextaddr = ip6->ip6_dst; 182 if (IN6_IS_ADDR_LINKLOCAL(nextaddr)) 183 nextaddr->s6_addr16[1] = 0; 184 ip6->ip6_dst = tmpaddr; 185 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 186 ip6->ip6_dst.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index); 187 188 #ifdef COMPAT_RFC1883 189 if (rh0->ip6r0_slmap[index / 8] & (1 << (7 - (index % 8)))) 190 ip6_forward(m, IPV6_SRCRT_NEIGHBOR); 191 else 192 ip6_forward(m, IPV6_SRCRT_NOTNEIGHBOR); 193 #else 194 ip6_forward(m, 1); 195 #endif 196 197 return (-1); /* m would be freed in ip6_forward() */ 198 199 bad: 200 m_freem(m); 201 return (-1); 202 }
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