ip6.h revision 57917
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: head/sys/netinet6/ip6.h 57917 2000-03-11 20:44:53Z shin $ 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#if !defined(_KERNEL) && !defined(__KAME_NETINET_IP6_H_INCLUDED_) 71#error "do not include netinet6/ip6.h directly, include netinet/ip6.h" 72#endif 73 74/* 75 * Definition for internet protocol version 6. 76 * RFC 2460 77 */ 78 79struct ip6_hdr { 80 union { 81 struct ip6_hdrctl { 82 u_int32_t ip6_un1_flow; /* 4 bits version, 83 * 8 bits traffic 84 * class, 85 * 20 bits flow-ID */ 86 u_int16_t ip6_un1_plen; /* payload length */ 87 u_int8_t ip6_un1_nxt; /* next header */ 88 u_int8_t ip6_un1_hlim; /* hop limit */ 89 } ip6_un1; 90 u_int8_t ip6_un2_vfc; /* 4 bits version, 91 * top 4 bits trafic class */ 92 } ip6_ctlun; 93 struct in6_addr ip6_src; /* source address */ 94 struct in6_addr ip6_dst; /* destination address */ 95}; 96 97#define ip6_vfc ip6_ctlun.ip6_un2_vfc 98#define ip6_flow ip6_ctlun.ip6_un1.ip6_un1_flow 99#define ip6_plen ip6_ctlun.ip6_un1.ip6_un1_plen 100#define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt 101#define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim 102#define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim 103 104#define IPV6_VERSION 0x60 105#define IPV6_VERSION_MASK 0xf0 106 107#if BYTE_ORDER == BIG_ENDIAN 108#define IPV6_FLOWINFO_MASK 0x0fffffff /* flow info (28 bits) */ 109#define IPV6_FLOWLABEL_MASK 0x000fffff /* flow label (20 bits) */ 110#endif /* BIG_ENDIAN */ 111#if BYTE_ORDER == LITTLE_ENDIAN 112#define IPV6_FLOWINFO_MASK 0xffffff0f /* flow info (28 bits) */ 113#define IPV6_FLOWLABEL_MASK 0xffff0f00 /* flow label (20 bits) */ 114#endif /* LITTLE_ENDIAN */ 115/* ECN bits proposed by Sally Floyd */ 116#define IP6TOS_CE 0x01 /* congestion experienced */ 117#define IP6TOS_ECT 0x02 /* ECN-capable transport */ 118 119/* 120 * Extension Headers 121 */ 122 123struct ip6_ext { 124 u_char ip6e_nxt; 125 u_char ip6e_len; 126}; 127 128/* Hop-by-Hop options header */ 129/* XXX should we pad it to force alignment on an 8-byte boundary? */ 130struct ip6_hbh { 131 u_int8_t ip6h_nxt; /* next header */ 132 u_int8_t ip6h_len; /* length in units of 8 octets */ 133 /* followed by options */ 134}; 135 136/* Destination options header */ 137/* XXX should we pad it to force alignment on an 8-byte boundary? */ 138struct ip6_dest { 139 u_int8_t ip6d_nxt; /* next header */ 140 u_int8_t ip6d_len; /* length in units of 8 octets */ 141 /* followed by options */ 142}; 143 144/* Option types and related macros */ 145#define IP6OPT_PAD1 0x00 /* 00 0 00000 */ 146#define IP6OPT_PADN 0x01 /* 00 0 00001 */ 147#define IP6OPT_JUMBO 0xC2 /* 11 0 00010 = 194 */ 148#define IP6OPT_JUMBO_LEN 6 149#define IP6OPT_RTALERT 0x05 /* 00 0 00101 */ 150#define IP6OPT_RTALERT_LEN 4 151#define IP6OPT_RTALERT_MLD 0 /* Datagram contains an MLD message */ 152#define IP6OPT_RTALERT_RSVP 1 /* Datagram contains an RSVP message */ 153#define IP6OPT_RTALERT_ACTNET 2 /* contains an Active Networks msg */ 154#define IP6OPT_MINLEN 2 155 156#define IP6OPT_TYPE(o) ((o) & 0xC0) 157#define IP6OPT_TYPE_SKIP 0x00 158#define IP6OPT_TYPE_DISCARD 0x40 159#define IP6OPT_TYPE_FORCEICMP 0x80 160#define IP6OPT_TYPE_ICMP 0xC0 161 162#define IP6OPT_MUTABLE 0x20 163 164/* Routing header */ 165struct ip6_rthdr { 166 u_int8_t ip6r_nxt; /* next header */ 167 u_int8_t ip6r_len; /* length in units of 8 octets */ 168 u_int8_t ip6r_type; /* routing type */ 169 u_int8_t ip6r_segleft; /* segments left */ 170 /* followed by routing type specific data */ 171}; 172 173/* Type 0 Routing header */ 174struct ip6_rthdr0 { 175 u_int8_t ip6r0_nxt; /* next header */ 176 u_int8_t ip6r0_len; /* length in units of 8 octets */ 177 u_int8_t ip6r0_type; /* always zero */ 178 u_int8_t ip6r0_segleft; /* segments left */ 179 u_int8_t ip6r0_reserved; /* reserved field */ 180 u_int8_t ip6r0_slmap[3]; /* strict/loose bit map */ 181 struct in6_addr ip6r0_addr[1]; /* up to 23 addresses */ 182}; 183 184/* Fragment header */ 185struct ip6_frag { 186 u_int8_t ip6f_nxt; /* next header */ 187 u_int8_t ip6f_reserved; /* reserved field */ 188 u_int16_t ip6f_offlg; /* offset, reserved, and flag */ 189 u_int32_t ip6f_ident; /* identification */ 190}; 191 192#if BYTE_ORDER == BIG_ENDIAN 193#define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */ 194#define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */ 195#define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */ 196#else /* BYTE_ORDER == LITTLE_ENDIAN */ 197#define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */ 198#define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */ 199#define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */ 200#endif /* BYTE_ORDER == LITTLE_ENDIAN */ 201 202/* 203 * Internet implementation parameters. 204 */ 205#define IPV6_MAXHLIM 255 /* maximun hoplimit */ 206#define IPV6_DEFHLIM 64 /* default hlim */ 207#define IPV6_FRAGTTL 120 /* ttl for fragment packets, in slowtimo tick */ 208#define IPV6_HLIMDEC 1 /* subtracted when forwaeding */ 209 210#define IPV6_MMTU 1280 /* minimal MTU and reassembly. 1024 + 256 */ 211#define IPV6_MAXPACKET 65535 /* ip6 max packet size without Jumbo payload*/ 212 213/* 214 * IP6_EXTHDR_CHECK ensures that region between the IP6 header and the 215 * target header (including IPv6 itself, extension headers and 216 * TCP/UDP/ICMP6 headers) are continuous. KAME requires drivers 217 * to store incoming data into one internal mbuf or one or more external 218 * mbufs(never into two or more internal mbufs). Thus, the third case is 219 * supposed to never be matched but is prepared just in case. 220 */ 221 222#define IP6_EXTHDR_CHECK(m, off, hlen, ret) \ 223do { \ 224 if ((m)->m_next != NULL) { \ 225 if (((m)->m_flags & M_LOOP) && \ 226 ((m)->m_len < (off) + (hlen)) && \ 227 (((m) = m_pullup((m), (off) + (hlen))) == NULL)) { \ 228 ip6stat.ip6s_exthdrtoolong++; \ 229 return ret; \ 230 } else if ((m)->m_flags & M_EXT) { \ 231 if ((m)->m_len < (off) + (hlen)) { \ 232 ip6stat.ip6s_exthdrtoolong++; \ 233 m_freem(m); \ 234 return ret; \ 235 } \ 236 } else { \ 237 if ((m)->m_len < (off) + (hlen)) { \ 238 ip6stat.ip6s_exthdrtoolong++; \ 239 m_freem(m); \ 240 return ret; \ 241 } \ 242 } \ 243 } else { \ 244 if ((m)->m_len < (off) + (hlen)) { \ 245 ip6stat.ip6s_tooshort++; \ 246 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); \ 247 m_freem(m); \ 248 return ret; \ 249 } \ 250 } \ 251} while (0) 252 253#endif /* not _NETINET_IPV6_H_ */ 254