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 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 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. 28 * 29 * $FreeBSD$ 30 */ 31 32 /* 33 * Copyright (c) 1982, 1986, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. All advertising materials mentioning features or use of this software 45 * must display the following acknowledgement: 46 * This product includes software developed by the University of 47 * California, Berkeley and its contributors. 48 * 4. Neither the name of the University nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 * 64 * @(#)ip.h 8.1 (Berkeley) 6/10/93 65 */ 66 67 #ifndef _NETINET6_IPV6_H_ 68 #define _NETINET6_IPV6_H_ 69 70 /* 71 * Definition for internet protocol version 6. 72 * RFC 2460 73 */ 74 75 struct ip6_hdr { 76 union { 77 struct ip6_hdrctl { 78 u_int32_t ip6_un1_flow; /* 20 bits of flow-ID */ 79 u_int16_t ip6_un1_plen; /* payload length */ 80 u_int8_t ip6_un1_nxt; /* next header */ 81 u_int8_t ip6_un1_hlim; /* hop limit */ 82 } ip6_un1; 83 u_int8_t ip6_un2_vfc; /* 4 bits version, 4 bits class */ 84 } ip6_ctlun; 85 struct in6_addr ip6_src; /* source address */ 86 struct in6_addr ip6_dst; /* destination address */ 87 }; 88 89 #define ip6_vfc ip6_ctlun.ip6_un2_vfc 90 #define ip6_flow ip6_ctlun.ip6_un1.ip6_un1_flow 91 #define ip6_plen ip6_ctlun.ip6_un1.ip6_un1_plen 92 #define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt 93 #define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim 94 #define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim 95 96 #define IPV6_VERSION 0x60 97 #define IPV6_VERSION_MASK 0xf0 98 99 #if BYTE_ORDER == BIG_ENDIAN 100 #define IPV6_FLOWINFO_MASK 0x0fffffff /* flow info (28 bits) */ 101 #define IPV6_FLOWLABEL_MASK 0x000fffff /* flow label (20 bits) */ 102 #endif /* BIG_ENDIAN */ 103 #if BYTE_ORDER == LITTLE_ENDIAN 104 #define IPV6_FLOWINFO_MASK 0xffffff0f /* flow info (28 bits) */ 105 #define IPV6_FLOWLABEL_MASK 0xffff0f00 /* flow label (20 bits) */ 106 #endif /* LITTLE_ENDIAN */ 107 /* ECN bits proposed by Sally Floyd */ 108 #define IP6TOS_CE 0x01 /* congestion experienced */ 109 #define IP6TOS_ECT 0x02 /* ECN-capable transport */ 110 111 /* 112 * Extension Headers 113 */ 114 115 struct ip6_ext { 116 u_char ip6e_nxt; 117 u_char ip6e_len; 118 }; 119 120 /* Hop-by-Hop options header */ 121 /* XXX should we pad it to force alignment on an 8-byte boundary? */ 122 struct ip6_hbh { 123 u_int8_t ip6h_nxt; /* next header */ 124 u_int8_t ip6h_len; /* length in units of 8 octets */ 125 /* followed by options */ 126 }; 127 128 /* Destination options header */ 129 /* XXX should we pad it to force alignment on an 8-byte boundary? */ 130 struct ip6_dest { 131 u_int8_t ip6d_nxt; /* next header */ 132 u_int8_t ip6d_len; /* length in units of 8 octets */ 133 /* followed by options */ 134 }; 135 136 /* Option types and related macros */ 137 #define IP6OPT_PAD1 0x00 /* 00 0 00000 */ 138 #define IP6OPT_PADN 0x01 /* 00 0 00001 */ 139 #define IP6OPT_JUMBO 0xC2 /* 11 0 00010 = 194 */ 140 #define IP6OPT_JUMBO_LEN 6 141 #define IP6OPT_RTALERT 0x05 /* 00 0 00101 */ 142 #define IP6OPT_RTALERT_LEN 4 143 #define IP6OPT_RTALERT_MLD 0 /* Datagram contains an MLD message */ 144 #define IP6OPT_RTALERT_RSVP 1 /* Datagram contains an RSVP message */ 145 #define IP6OPT_RTALERT_ACTNET 2 /* contains an Active Networks msg */ 146 #define IP6OPT_MINLEN 2 147 148 #define IP6OPT_TYPE(o) ((o) & 0xC0) 149 #define IP6OPT_TYPE_SKIP 0x00 150 #define IP6OPT_TYPE_DISCARD 0x40 151 #define IP6OPT_TYPE_FORCEICMP 0x80 152 #define IP6OPT_TYPE_ICMP 0xC0 153 154 #define IP6OPT_MUTABLE 0x20 155 156 /* Routing header */ 157 struct ip6_rthdr { 158 u_int8_t ip6r_nxt; /* next header */ 159 u_int8_t ip6r_len; /* length in units of 8 octets */ 160 u_int8_t ip6r_type; /* routing type */ 161 u_int8_t ip6r_segleft; /* segments left */ 162 /* followed by routing type specific data */ 163 }; 164 165 /* Type 0 Routing header */ 166 struct ip6_rthdr0 { 167 u_int8_t ip6r0_nxt; /* next header */ 168 u_int8_t ip6r0_len; /* length in units of 8 octets */ 169 u_int8_t ip6r0_type; /* always zero */ 170 u_int8_t ip6r0_segleft; /* segments left */ 171 u_int8_t ip6r0_reserved; /* reserved field */ 172 u_int8_t ip6r0_slmap[3]; /* strict/loose bit map */ 173 struct in6_addr ip6r0_addr[1]; /* up to 23 addresses */ 174 }; 175 176 /* Fragment header */ 177 struct ip6_frag { 178 u_int8_t ip6f_nxt; /* next header */ 179 u_int8_t ip6f_reserved; /* reserved field */ 180 u_int16_t ip6f_offlg; /* offset, reserved, and flag */ 181 u_int32_t ip6f_ident; /* identification */ 182 }; 183 184 #if BYTE_ORDER == BIG_ENDIAN 185 #define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */ 186 #define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */ 187 #define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */ 188 #else /* BYTE_ORDER == LITTLE_ENDIAN */ 189 #define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */ 190 #define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */ 191 #define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */ 192 #endif /* BYTE_ORDER == LITTLE_ENDIAN */ 193 194 /* 195 * Internet implementation parameters. 196 */ 197 #define IPV6_MAXHLIM 255 /* maximun hoplimit */ 198 #define IPV6_DEFHLIM 64 /* default hlim */ 199 #define IPV6_FRAGTTL 120 /* ttl for fragment packets, in slowtimo tick */ 200 #define IPV6_HLIMDEC 1 /* subtracted when forwaeding */ 201 202 #define IPV6_MMTU 1280 /* minimal MTU and reassembly. 1024 + 256 */ 203 #define IPV6_MAXPACKET 65535 /* ip6 max packet size without Jumbo payload*/ 204 205 /* 206 * IP6_EXTHDR_CHECK ensures that region between the IP6 header and the 207 * target header (including IPv6 itself, extension headers and 208 * TCP/UDP/ICMP6 headers) are continuous. KAME requires drivers 209 * to store incoming data into one internal mbuf or one or more external 210 * mbufs(never into two or more internal mbufs). Thus, the third case is 211 * supposed to never be matched but is prepared just in case. 212 */ 213 214 #define IP6_EXTHDR_CHECK(m, off, hlen, ret) \ 215 do { \ 216 if ((m)->m_next != NULL) { \ 217 if (((m)->m_flags & M_LOOP) && \ 218 ((m)->m_len < (off) + (hlen)) && \ 219 (((m) = m_pullup((m), (off) + (hlen))) == NULL)) { \ 220 ip6stat.ip6s_exthdrtoolong++; \ 221 return ret; \ 222 } else if ((m)->m_flags & M_EXT) { \ 223 if ((m)->m_len < (off) + (hlen)) { \ 224 ip6stat.ip6s_exthdrtoolong++; \ 225 m_freem(m); \ 226 return ret; \ 227 } \ 228 } else { \ 229 if ((m)->m_len < (off) + (hlen)) { \ 230 ip6stat.ip6s_exthdrtoolong++; \ 231 m_freem(m); \ 232 return ret; \ 233 } \ 234 } \ 235 } else { \ 236 if ((m)->m_len < (off) + (hlen)) { \ 237 ip6stat.ip6s_tooshort++; \ 238 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); \ 239 m_freem(m); \ 240 return ret; \ 241 } \ 242 } \ 243 } while (0) 244 245 #endif /* not _NETINET_IPV6_H_ */ 246