Annotation of sys/netinet/ip6.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: ip6.h,v 1.18 2006/12/09 01:12:28 itojun Exp $ */
! 2: /* $KAME: ip6.h,v 1.45 2003/06/05 04:46:38 keiichi 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: /*
! 34: * Copyright (c) 1982, 1986, 1993
! 35: * The Regents of the University of California. All rights reserved.
! 36: *
! 37: * Redistribution and use in source and binary forms, with or without
! 38: * modification, are permitted provided that the following conditions
! 39: * are met:
! 40: * 1. Redistributions of source code must retain the above copyright
! 41: * notice, this list of conditions and the following disclaimer.
! 42: * 2. Redistributions in binary form must reproduce the above copyright
! 43: * notice, this list of conditions and the following disclaimer in the
! 44: * documentation and/or other materials provided with the distribution.
! 45: * 3. Neither the name of the University nor the names of its contributors
! 46: * may be used to endorse or promote products derived from this software
! 47: * without specific prior written permission.
! 48: *
! 49: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 50: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 51: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 52: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 53: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 54: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 55: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 56: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 57: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 58: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 59: * SUCH DAMAGE.
! 60: *
! 61: * @(#)ip.h 8.1 (Berkeley) 6/10/93
! 62: */
! 63:
! 64: #ifndef _NETINET_IP6_H_
! 65: #define _NETINET_IP6_H_
! 66:
! 67: /*
! 68: * Definition for internet protocol version 6.
! 69: * RFC 2460
! 70: */
! 71:
! 72: struct ip6_hdr {
! 73: union {
! 74: struct ip6_hdrctl {
! 75: u_int32_t ip6_un1_flow; /* 20 bits of flow-ID */
! 76: u_int16_t ip6_un1_plen; /* payload length */
! 77: u_int8_t ip6_un1_nxt; /* next header */
! 78: u_int8_t ip6_un1_hlim; /* hop limit */
! 79: } ip6_un1;
! 80: u_int8_t ip6_un2_vfc; /* 4 bits version, top 4 bits class */
! 81: } ip6_ctlun;
! 82: struct in6_addr ip6_src; /* source address */
! 83: struct in6_addr ip6_dst; /* destination address */
! 84: } __packed;
! 85:
! 86: #define ip6_vfc ip6_ctlun.ip6_un2_vfc
! 87: #define ip6_flow ip6_ctlun.ip6_un1.ip6_un1_flow
! 88: #define ip6_plen ip6_ctlun.ip6_un1.ip6_un1_plen
! 89: #define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt
! 90: #define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim
! 91: #define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim
! 92:
! 93: #define IPV6_VERSION 0x60
! 94: #define IPV6_VERSION_MASK 0xf0
! 95:
! 96: #if _BYTE_ORDER == _BIG_ENDIAN
! 97: #define IPV6_FLOWINFO_MASK 0x0fffffff /* flow info (28 bits) */
! 98: #define IPV6_FLOWLABEL_MASK 0x000fffff /* flow label (20 bits) */
! 99: #else
! 100: #if _BYTE_ORDER == _LITTLE_ENDIAN
! 101: #define IPV6_FLOWINFO_MASK 0xffffff0f /* flow info (28 bits) */
! 102: #define IPV6_FLOWLABEL_MASK 0xffff0f00 /* flow label (20 bits) */
! 103: #endif /* _LITTLE_ENDIAN */
! 104: #endif
! 105: #if 1
! 106: /* ECN bits proposed by Sally Floyd */
! 107: #define IP6TOS_CE 0x01 /* congestion experienced */
! 108: #define IP6TOS_ECT 0x02 /* ECN-capable transport */
! 109: #endif
! 110:
! 111: #ifdef _KERNEL
! 112: /*
! 113: * for IPv6 pseudo header checksum
! 114: * XXX nonstandard
! 115: */
! 116: struct ip6_hdr_pseudo {
! 117: struct in6_addr ip6ph_src;
! 118: struct in6_addr ip6ph_dst;
! 119: u_int32_t ip6ph_len;
! 120: u_int8_t ip6ph_zero[3];
! 121: u_int8_t ip6ph_nxt;
! 122: } __packed;
! 123: #endif
! 124:
! 125: /*
! 126: * Extension Headers
! 127: */
! 128: struct ip6_ext {
! 129: u_int8_t ip6e_nxt;
! 130: u_int8_t ip6e_len;
! 131: } __packed;
! 132:
! 133: /* Hop-by-Hop options header */
! 134: /* XXX should we pad it to force alignment on an 8-byte boundary? */
! 135: struct ip6_hbh {
! 136: u_int8_t ip6h_nxt; /* next header */
! 137: u_int8_t ip6h_len; /* length in units of 8 octets */
! 138: /* followed by options */
! 139: } __packed;
! 140:
! 141: /* Destination options header */
! 142: /* XXX should we pad it to force alignment on an 8-byte boundary? */
! 143: struct ip6_dest {
! 144: u_int8_t ip6d_nxt; /* next header */
! 145: u_int8_t ip6d_len; /* length in units of 8 octets */
! 146: /* followed by options */
! 147: } __packed;
! 148:
! 149: /* Option types and related macros */
! 150: #define IP6OPT_PAD1 0x00 /* 00 0 00000 */
! 151: #define IP6OPT_PADN 0x01 /* 00 0 00001 */
! 152: #define IP6OPT_JUMBO 0xC2 /* 11 0 00010 = 194 */
! 153: #define IP6OPT_NSAP_ADDR 0xC3 /* 11 0 00011 */
! 154: #define IP6OPT_TUNNEL_LIMIT 0x04 /* 00 0 00100 */
! 155: #define IP6OPT_ROUTER_ALERT 0x05 /* 00 0 00101 (RFC3542, recommended) */
! 156:
! 157: #define IP6OPT_RTALERT_LEN 4
! 158: #define IP6OPT_RTALERT_MLD 0 /* Datagram contains an MLD message */
! 159: #define IP6OPT_RTALERT_RSVP 1 /* Datagram contains an RSVP message */
! 160: #define IP6OPT_RTALERT_ACTNET 2 /* contains an Active Networks msg */
! 161: #define IP6OPT_MINLEN 2
! 162:
! 163: #define IP6OPT_TYPE(o) ((o) & 0xC0)
! 164: #define IP6OPT_TYPE_SKIP 0x00
! 165: #define IP6OPT_TYPE_DISCARD 0x40
! 166: #define IP6OPT_TYPE_FORCEICMP 0x80
! 167: #define IP6OPT_TYPE_ICMP 0xC0
! 168:
! 169: #define IP6OPT_MUTABLE 0x20
! 170:
! 171: /* IPv6 options: common part */
! 172: struct ip6_opt {
! 173: u_int8_t ip6o_type;
! 174: u_int8_t ip6o_len;
! 175: } __packed;
! 176:
! 177: /* Jumbo Payload Option */
! 178: struct ip6_opt_jumbo {
! 179: u_int8_t ip6oj_type;
! 180: u_int8_t ip6oj_len;
! 181: u_int8_t ip6oj_jumbo_len[4];
! 182: } __packed;
! 183: #define IP6OPT_JUMBO_LEN 6
! 184:
! 185: /* NSAP Address Option */
! 186: struct ip6_opt_nsap {
! 187: u_int8_t ip6on_type;
! 188: u_int8_t ip6on_len;
! 189: u_int8_t ip6on_src_nsap_len;
! 190: u_int8_t ip6on_dst_nsap_len;
! 191: /* followed by source NSAP */
! 192: /* followed by destination NSAP */
! 193: } __packed;
! 194:
! 195: /* Tunnel Limit Option */
! 196: struct ip6_opt_tunnel {
! 197: u_int8_t ip6ot_type;
! 198: u_int8_t ip6ot_len;
! 199: u_int8_t ip6ot_encap_limit;
! 200: } __packed;
! 201:
! 202: /* Router Alert Option */
! 203: struct ip6_opt_router {
! 204: u_int8_t ip6or_type;
! 205: u_int8_t ip6or_len;
! 206: u_int8_t ip6or_value[2];
! 207: } __packed;
! 208: /* Router alert values (in network byte order) */
! 209: #if _BYTE_ORDER == _BIG_ENDIAN
! 210: #define IP6_ALERT_MLD 0x0000
! 211: #define IP6_ALERT_RSVP 0x0001
! 212: #define IP6_ALERT_AN 0x0002
! 213: #else
! 214: #if _BYTE_ORDER == _LITTLE_ENDIAN
! 215: #define IP6_ALERT_MLD 0x0000
! 216: #define IP6_ALERT_RSVP 0x0100
! 217: #define IP6_ALERT_AN 0x0200
! 218: #endif /* _LITTLE_ENDIAN */
! 219: #endif
! 220:
! 221: /* Routing header */
! 222: struct ip6_rthdr {
! 223: u_int8_t ip6r_nxt; /* next header */
! 224: u_int8_t ip6r_len; /* length in units of 8 octets */
! 225: u_int8_t ip6r_type; /* routing type */
! 226: u_int8_t ip6r_segleft; /* segments left */
! 227: /* followed by routing type specific data */
! 228: } __packed;
! 229:
! 230: /* Type 0 Routing header */
! 231: struct ip6_rthdr0 {
! 232: u_int8_t ip6r0_nxt; /* next header */
! 233: u_int8_t ip6r0_len; /* length in units of 8 octets */
! 234: u_int8_t ip6r0_type; /* always zero */
! 235: u_int8_t ip6r0_segleft; /* segments left */
! 236: u_int32_t ip6r0_reserved; /* reserved field */
! 237: } __packed;
! 238:
! 239: /* Fragment header */
! 240: struct ip6_frag {
! 241: u_int8_t ip6f_nxt; /* next header */
! 242: u_int8_t ip6f_reserved; /* reserved field */
! 243: u_int16_t ip6f_offlg; /* offset, reserved, and flag */
! 244: u_int32_t ip6f_ident; /* identification */
! 245: } __packed;
! 246:
! 247: #if _BYTE_ORDER == _BIG_ENDIAN
! 248: #define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */
! 249: #define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */
! 250: #define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */
! 251: #else /* _BYTE_ORDER == _LITTLE_ENDIAN */
! 252: #define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */
! 253: #define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */
! 254: #define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */
! 255: #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */
! 256:
! 257: /*
! 258: * Internet implementation parameters.
! 259: */
! 260: #define IPV6_MAXHLIM 255 /* maximum hoplimit */
! 261: #define IPV6_DEFHLIM 64 /* default hlim */
! 262: #define IPV6_FRAGTTL 120 /* ttl for fragment packets, in slowtimo tick */
! 263: #define IPV6_HLIMDEC 1 /* subtracted when forwarding */
! 264:
! 265: #define IPV6_MMTU 1280 /* minimal MTU and reassembly. 1024 + 256 */
! 266: #define IPV6_MAXPACKET 65535 /* ip6 max packet size without Jumbo payload*/
! 267:
! 268: #ifdef _KERNEL
! 269: /*
! 270: * IP6_EXTHDR_GET ensures that intermediate protocol header (from "off" to
! 271: * "len") is located in single mbuf, on contiguous memory region.
! 272: * The pointer to the region will be returned to pointer variable "val",
! 273: * with type "typ".
! 274: * IP6_EXTHDR_GET0 does the same, except that it aligns the structure at the
! 275: * very top of mbuf. GET0 is likely to make memory copy than GET.
! 276: */
! 277: #define IP6_EXTHDR_GET(val, typ, m, off, len) \
! 278: do { \
! 279: struct mbuf *t; \
! 280: int tmp; \
! 281: if ((m)->m_len >= (off) + (len)) \
! 282: (val) = (typ)(mtod((m), caddr_t) + (off)); \
! 283: else { \
! 284: t = m_pulldown((m), (off), (len), &tmp); \
! 285: if (t) { \
! 286: if (t->m_len < tmp + (len)) \
! 287: panic("m_pulldown malfunction"); \
! 288: (val) = (typ)(mtod(t, caddr_t) + tmp); \
! 289: } else { \
! 290: (val) = (typ)NULL; \
! 291: (m) = NULL; \
! 292: } \
! 293: } \
! 294: } while (0)
! 295:
! 296: #define IP6_EXTHDR_GET0(val, typ, m, off, len) \
! 297: do { \
! 298: struct mbuf *t; \
! 299: if ((off) == 0 && (m)->m_len >= len) \
! 300: (val) = (typ)mtod((m), caddr_t); \
! 301: else { \
! 302: t = m_pulldown((m), (off), (len), NULL); \
! 303: if (t) { \
! 304: if (t->m_len < (len)) \
! 305: panic("m_pulldown malfunction"); \
! 306: (val) = (typ)mtod(t, caddr_t); \
! 307: } else { \
! 308: (val) = (typ)NULL; \
! 309: (m) = NULL; \
! 310: } \
! 311: } \
! 312: } while (0)
! 313: #endif /* _KERNEL */
! 314: #endif /* _NETINET_IP6_H_ */
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