1 /** 2 * @file 3 * IPv6 protocol definitions 4 */ 5 6 /* 7 * Copyright (c) 2001-2004 Swedish Institute of Computer Science. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without modification, 11 * are permitted provided that the following conditions are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright notice, 14 * this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright notice, 16 * this list of conditions and the following disclaimer in the documentation 17 * and/or other materials provided with the distribution. 18 * 3. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 24 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 26 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 29 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 30 * OF SUCH DAMAGE. 31 * 32 * This file is part of the lwIP TCP/IP stack. 33 * 34 * Author: Adam Dunkels <adam@sics.se> 35 * 36 */ 37 #ifndef LWIP_HDR_PROT_IP6_H 38 #define LWIP_HDR_PROT_IP6_H 39 40 #include "lwip/arch.h" 41 #include "lwip/ip6_addr.h" 42 43 #ifdef __cplusplus 44 extern "C" { 45 #endif 46 47 #define IP6_MIN_MTU_LENGTH 1280 48 49 /** This is the packed version of ip6_addr_t, 50 used in network headers that are itself packed */ 51 #ifdef PACK_STRUCT_USE_INCLUDES 52 # include "arch/bpstruct.h" 53 #endif 54 PACK_STRUCT_BEGIN 55 struct ip6_addr_packed { 56 PACK_STRUCT_FIELD(u32_t addr[4]); 57 } PACK_STRUCT_STRUCT; 58 PACK_STRUCT_END 59 #ifdef PACK_STRUCT_USE_INCLUDES 60 # include "arch/epstruct.h" 61 #endif 62 typedef struct ip6_addr_packed ip6_addr_p_t; 63 64 #define IP6_HLEN 40 65 66 #define IP6_NEXTH_HOPBYHOP 0 67 #define IP6_NEXTH_TCP 6 68 #define IP6_NEXTH_UDP 17 69 #define IP6_NEXTH_ENCAPS 41 70 #define IP6_NEXTH_ROUTING 43 71 #define IP6_NEXTH_FRAGMENT 44 72 #define IP6_NEXTH_ICMP6 58 73 #define IP6_NEXTH_NONE 59 74 #define IP6_NEXTH_DESTOPTS 60 75 #define IP6_NEXTH_UDPLITE 136 76 77 /** The IPv6 header. */ 78 #ifdef PACK_STRUCT_USE_INCLUDES 79 # include "arch/bpstruct.h" 80 #endif 81 PACK_STRUCT_BEGIN 82 struct ip6_hdr { 83 /** version / traffic class / flow label */ 84 PACK_STRUCT_FIELD(u32_t _v_tc_fl); 85 /** payload length */ 86 PACK_STRUCT_FIELD(u16_t _plen); 87 /** next header */ 88 PACK_STRUCT_FLD_8(u8_t _nexth); 89 /** hop limit */ 90 PACK_STRUCT_FLD_8(u8_t _hoplim); 91 /** source and destination IP addresses */ 92 PACK_STRUCT_FLD_S(ip6_addr_p_t src); 93 PACK_STRUCT_FLD_S(ip6_addr_p_t dest); 94 } PACK_STRUCT_STRUCT; 95 PACK_STRUCT_END 96 #ifdef PACK_STRUCT_USE_INCLUDES 97 # include "arch/epstruct.h" 98 #endif 99 #define IP6H_V(hdr) ((lwip_ntohl((hdr)->_v_tc_fl) >> 28) & 0x0f) 100 #define IP6H_TC(hdr) ((lwip_ntohl((hdr)->_v_tc_fl) >> 20) & 0xff) 101 #define IP6H_FL(hdr) (lwip_ntohl((hdr)->_v_tc_fl) & 0x000fffff) 102 #define IP6H_PLEN(hdr) (lwip_ntohs((hdr)->_plen)) 103 #define IP6H_NEXTH(hdr) ((hdr)->_nexth) 104 #define IP6H_NEXTH_P(hdr) ((u8_t *)(hdr) + 6) 105 #define IP6H_HOPLIM(hdr) ((hdr)->_hoplim) 106 #define IP6H_VTCFL_SET(hdr, v, tc, fl) (hdr)->_v_tc_fl = (lwip_htonl((((u32_t)(v)) << 28) | (((u32_t)(tc)) << 20) | (fl))) 107 #define IP6H_PLEN_SET(hdr, plen) (hdr)->_plen = lwip_htons(plen) 108 #define IP6H_NEXTH_SET(hdr, nexth) (hdr)->_nexth = (nexth) 109 #define IP6H_HOPLIM_SET(hdr, hl) (hdr)->_hoplim = (u8_t)(hl) 110 111 /* ipv6 extended options header */ 112 #define IP6_PAD1_OPTION 0 113 #define IP6_PADN_OPTION 1 114 #define IP6_ROUTER_ALERT_OPTION 5 115 #define IP6_JUMBO_OPTION 194 116 #define IP6_HOME_ADDRESS_OPTION 201 117 #define IP6_ROUTER_ALERT_DLEN 2 118 #define IP6_ROUTER_ALERT_VALUE_MLD 0 119 120 #ifdef PACK_STRUCT_USE_INCLUDES 121 # include "arch/bpstruct.h" 122 #endif 123 PACK_STRUCT_BEGIN 124 struct ip6_opt_hdr { 125 /* router alert option type */ 126 PACK_STRUCT_FLD_8(u8_t _opt_type); 127 /* router alert option data len */ 128 PACK_STRUCT_FLD_8(u8_t _opt_dlen); 129 } PACK_STRUCT_STRUCT; 130 PACK_STRUCT_END 131 #ifdef PACK_STRUCT_USE_INCLUDES 132 # include "arch/epstruct.h" 133 #endif 134 #define IP6_OPT_HLEN 2 135 #define IP6_OPT_TYPE_ACTION(hdr) ((((hdr)->_opt_type) >> 6) & 0x3) 136 #define IP6_OPT_TYPE_CHANGE(hdr) ((((hdr)->_opt_type) >> 5) & 0x1) 137 #define IP6_OPT_TYPE(hdr) ((hdr)->_opt_type) 138 #define IP6_OPT_DLEN(hdr) ((hdr)->_opt_dlen) 139 140 /* Hop-by-Hop header. */ 141 #define IP6_HBH_HLEN 2 142 143 #ifdef PACK_STRUCT_USE_INCLUDES 144 # include "arch/bpstruct.h" 145 #endif 146 PACK_STRUCT_BEGIN 147 struct ip6_hbh_hdr { 148 /* next header */ 149 PACK_STRUCT_FLD_8(u8_t _nexth); 150 /* header length in 8-octet units */ 151 PACK_STRUCT_FLD_8(u8_t _hlen); 152 } PACK_STRUCT_STRUCT; 153 PACK_STRUCT_END 154 #ifdef PACK_STRUCT_USE_INCLUDES 155 # include "arch/epstruct.h" 156 #endif 157 #define IP6_HBH_NEXTH(hdr) ((hdr)->_nexth) 158 159 /* Destination header. */ 160 #define IP6_DEST_HLEN 2 161 162 #ifdef PACK_STRUCT_USE_INCLUDES 163 # include "arch/bpstruct.h" 164 #endif 165 PACK_STRUCT_BEGIN 166 struct ip6_dest_hdr { 167 /* next header */ 168 PACK_STRUCT_FLD_8(u8_t _nexth); 169 /* header length in 8-octet units */ 170 PACK_STRUCT_FLD_8(u8_t _hlen); 171 } PACK_STRUCT_STRUCT; 172 PACK_STRUCT_END 173 #ifdef PACK_STRUCT_USE_INCLUDES 174 # include "arch/epstruct.h" 175 #endif 176 #define IP6_DEST_NEXTH(hdr) ((hdr)->_nexth) 177 178 /* Routing header */ 179 #define IP6_ROUT_TYPE2 2 180 #define IP6_ROUT_RPL 3 181 182 #ifdef PACK_STRUCT_USE_INCLUDES 183 # include "arch/bpstruct.h" 184 #endif 185 PACK_STRUCT_BEGIN 186 struct ip6_rout_hdr { 187 /* next header */ 188 PACK_STRUCT_FLD_8(u8_t _nexth); 189 /* reserved */ 190 PACK_STRUCT_FLD_8(u8_t _hlen); 191 /* fragment offset */ 192 PACK_STRUCT_FIELD(u8_t _routing_type); 193 /* fragmented packet identification */ 194 PACK_STRUCT_FIELD(u8_t _segments_left); 195 } PACK_STRUCT_STRUCT; 196 PACK_STRUCT_END 197 #ifdef PACK_STRUCT_USE_INCLUDES 198 # include "arch/epstruct.h" 199 #endif 200 #define IP6_ROUT_NEXTH(hdr) ((hdr)->_nexth) 201 #define IP6_ROUT_TYPE(hdr) ((hdr)->_routing_type) 202 #define IP6_ROUT_SEG_LEFT(hdr) ((hdr)->_segments_left) 203 204 /* Fragment header. */ 205 #define IP6_FRAG_HLEN 8 206 #define IP6_FRAG_OFFSET_MASK 0xfff8 207 #define IP6_FRAG_MORE_FLAG 0x0001 208 209 #ifdef PACK_STRUCT_USE_INCLUDES 210 # include "arch/bpstruct.h" 211 #endif 212 PACK_STRUCT_BEGIN 213 struct ip6_frag_hdr { 214 /* next header */ 215 PACK_STRUCT_FLD_8(u8_t _nexth); 216 /* reserved */ 217 PACK_STRUCT_FLD_8(u8_t reserved); 218 /* fragment offset */ 219 PACK_STRUCT_FIELD(u16_t _fragment_offset); 220 /* fragmented packet identification */ 221 PACK_STRUCT_FIELD(u32_t _identification); 222 } PACK_STRUCT_STRUCT; 223 PACK_STRUCT_END 224 #ifdef PACK_STRUCT_USE_INCLUDES 225 # include "arch/epstruct.h" 226 #endif 227 #define IP6_FRAG_NEXTH(hdr) ((hdr)->_nexth) 228 #define IP6_FRAG_MBIT(hdr) (lwip_ntohs((hdr)->_fragment_offset) & 0x1) 229 #define IP6_FRAG_ID(hdr) (lwip_ntohl((hdr)->_identification)) 230 231 #ifdef __cplusplus 232 } 233 #endif 234 235 #endif /* LWIP_HDR_PROT_IP6_H */ 236