Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/bsd/netinet6/route6.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /* $FreeBSD: src/sys/netinet6/route6.c,v 1.1.2.3 2001/07/03 11:01:55 ume Exp $ */ 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 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/param.h> 34 #include <sys/mbuf.h> 35 #include <sys/socket.h> 36 #include <sys/queue.h> 37 38 #include <net/if.h> 39 40 #include <netinet/in.h> 41 #include <netinet6/in6_var.h> 42 #include <netinet/ip6.h> 43 #include <netinet6/ip6_var.h> 44 45 #include <netinet/icmp6.h> 46 47 static int ip6_rthdr0 __P((struct mbuf *, struct ip6_hdr *, 48 struct ip6_rthdr0 *)); 49 50 int 51 route6_input(mp, offp) 52 struct mbuf **mp; 53 int *offp; 54 { 55 struct ip6_hdr *ip6; 56 struct mbuf *m = *mp; 57 struct ip6_rthdr *rh; 58 int off = *offp, rhlen; 59 struct mbuf *n; 60 61 n = ip6_findaux(m); 62 if (n) { 63 struct ip6aux *ip6a = mtod(n, struct ip6aux *); 64 /* XXX reject home-address option before rthdr */ 65 if (ip6a->ip6a_flags & IP6A_SWAP) { 66 ip6stat.ip6s_badoptions++; 67 m_freem(m); 68 return IPPROTO_DONE; 69 } 70 } 71 72 #ifndef PULLDOWN_TEST 73 IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE); 74 ip6 = mtod(m, struct ip6_hdr *); 75 rh = (struct ip6_rthdr *)((caddr_t)ip6 + off); 76 #else 77 ip6 = mtod(m, struct ip6_hdr *); 78 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh)); 79 if (rh == NULL) { 80 ip6stat.ip6s_tooshort++; 81 return IPPROTO_DONE; 82 } 83 #endif 84 85 switch (rh->ip6r_type) { 86 case IPV6_RTHDR_TYPE_0: 87 rhlen = (rh->ip6r_len + 1) << 3; 88 #ifndef PULLDOWN_TEST 89 /* 90 * note on option length: 91 * due to IP6_EXTHDR_CHECK assumption, we cannot handle 92 * very big routing header (max rhlen == 2048). 93 */ 94 IP6_EXTHDR_CHECK(m, off, rhlen, IPPROTO_DONE); 95 #else 96 /* 97 * note on option length: 98 * maximum rhlen: 2048 99 * max mbuf m_pulldown can handle: MCLBYTES == usually 2048 100 * so, here we are assuming that m_pulldown can handle 101 * rhlen == 2048 case. this may not be a good thing to 102 * assume - we may want to avoid pulling it up altogether. 103 */ 104 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, rhlen); 105 if (rh == NULL) { 106 ip6stat.ip6s_tooshort++; 107 return IPPROTO_DONE; 108 } 109 #endif 110 if (ip6_rthdr0(m, ip6, (struct ip6_rthdr0 *)rh)) 111 return(IPPROTO_DONE); 112 break; 113 default: 114 /* unknown routing type */ 115 if (rh->ip6r_segleft == 0) { 116 rhlen = (rh->ip6r_len + 1) << 3; 117 break; /* Final dst. Just ignore the header. */ 118 } 119 ip6stat.ip6s_badoptions++; 120 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 121 (caddr_t)&rh->ip6r_type - (caddr_t)ip6); 122 return(IPPROTO_DONE); 123 } 124 125 *offp += rhlen; 126 return(rh->ip6r_nxt); 127 } 128 129 /* 130 * Type0 routing header processing 131 * 132 * RFC2292 backward compatibility warning: no support for strict/loose bitmap, 133 * as it was dropped between RFC1883 and RFC2460. 134 */ 135 static int 136 ip6_rthdr0(m, ip6, rh0) 137 struct mbuf *m; 138 struct ip6_hdr *ip6; 139 struct ip6_rthdr0 *rh0; 140 { 141 int addrs, index; 142 struct in6_addr *nextaddr, tmpaddr; 143 144 if (rh0->ip6r0_segleft == 0) 145 return(0); 146 147 if (rh0->ip6r0_len % 2 148 #if COMPAT_RFC1883 149 || rh0->ip6r0_len > 46 150 #endif 151 ) { 152 /* 153 * Type 0 routing header can't contain more than 23 addresses. 154 * RFC 2462: this limitation was removed since stict/loose 155 * bitmap field was deleted. 156 */ 157 ip6stat.ip6s_badoptions++; 158 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 159 (caddr_t)&rh0->ip6r0_len - (caddr_t)ip6); 160 return(-1); 161 } 162 163 if ((addrs = rh0->ip6r0_len / 2) < rh0->ip6r0_segleft) { 164 ip6stat.ip6s_badoptions++; 165 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 166 (caddr_t)&rh0->ip6r0_segleft - (caddr_t)ip6); 167 return(-1); 168 } 169 170 index = addrs - rh0->ip6r0_segleft; 171 rh0->ip6r0_segleft--; 172 /* note that ip6r0_addr does not exist in RFC2292bis */ 173 nextaddr = rh0->ip6r0_addr + index; 174 175 /* 176 * reject invalid addresses. be proactive about malicious use of 177 * IPv4 mapped/compat address. 178 * XXX need more checks? 179 */ 180 if (IN6_IS_ADDR_MULTICAST(nextaddr) || 181 IN6_IS_ADDR_UNSPECIFIED(nextaddr) || 182 IN6_IS_ADDR_V4MAPPED(nextaddr) || 183 IN6_IS_ADDR_V4COMPAT(nextaddr)) { 184 ip6stat.ip6s_badoptions++; 185 m_freem(m); 186 return(-1); 187 } 188 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 189 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst) || 190 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst) || 191 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 192 ip6stat.ip6s_badoptions++; 193 m_freem(m); 194 return(-1); 195 } 196 197 /* 198 * Swap the IPv6 destination address and nextaddr. Forward the packet. 199 */ 200 tmpaddr = *nextaddr; 201 *nextaddr = ip6->ip6_dst; 202 if (IN6_IS_ADDR_LINKLOCAL(nextaddr)) 203 nextaddr->s6_addr16[1] = 0; 204 ip6->ip6_dst = tmpaddr; 205 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 206 ip6->ip6_dst.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index); 207 208 #if COMPAT_RFC1883 209 if (rh0->ip6r0_slmap[index / 8] & (1 << (7 - (index % 8)))) 210 ip6_forward(m, IPV6_SRCRT_NEIGHBOR); 211 else 212 ip6_forward(m, IPV6_SRCRT_NOTNEIGHBOR); 213 #else 214 ip6_forward(m, 1); 215 #endif 216 217 return(-1); /* m would be freed in ip6_forward() */ 218 }
Cache object: 4c03ca3524d367762d2f96e078f85454
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]