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 /** This is the packed version of ip6_addr_t, 48 used in network headers that are itself packed */ 49 #ifdef PACK_STRUCT_USE_INCLUDES 50 # include "arch/bpstruct.h" 51 #endif 52 PACK_STRUCT_BEGIN 53 struct ip6_addr_packed { 54 PACK_STRUCT_FIELD(u32_t addr[4]); 55 } PACK_STRUCT_STRUCT; 56 PACK_STRUCT_END 57 #ifdef PACK_STRUCT_USE_INCLUDES 58 # include "arch/epstruct.h" 59 #endif 60 typedef struct ip6_addr_packed ip6_addr_p_t; 61 62 #define IP6_HLEN 40 63 64 #define IP6_NEXTH_HOPBYHOP 0 65 #define IP6_NEXTH_TCP 6 66 #define IP6_NEXTH_UDP 17 67 #define IP6_NEXTH_ENCAPS 41 68 #define IP6_NEXTH_ROUTING 43 69 #define IP6_NEXTH_FRAGMENT 44 70 #define IP6_NEXTH_ICMP6 58 71 #define IP6_NEXTH_NONE 59 72 #define IP6_NEXTH_DESTOPTS 60 73 #define IP6_NEXTH_UDPLITE 136 74 75 /** The IPv6 header. */ 76 #ifdef PACK_STRUCT_USE_INCLUDES 77 # include "arch/bpstruct.h" 78 #endif 79 PACK_STRUCT_BEGIN 80 struct ip6_hdr { 81 /** version / traffic class / flow label */ 82 PACK_STRUCT_FIELD(u32_t _v_tc_fl); 83 /** payload length */ 84 PACK_STRUCT_FIELD(u16_t _plen); 85 /** next header */ 86 PACK_STRUCT_FLD_8(u8_t _nexth); 87 /** hop limit */ 88 PACK_STRUCT_FLD_8(u8_t _hoplim); 89 /** source and destination IP addresses */ 90 PACK_STRUCT_FLD_S(ip6_addr_p_t src); 91 PACK_STRUCT_FLD_S(ip6_addr_p_t dest); 92 } PACK_STRUCT_STRUCT; 93 PACK_STRUCT_END 94 #ifdef PACK_STRUCT_USE_INCLUDES 95 # include "arch/epstruct.h" 96 #endif 97 98 /* Hop-by-hop router alert option. */ 99 #define IP6_HBH_HLEN 8 100 #define IP6_PAD1_OPTION 0 101 #define IP6_PADN_ALERT_OPTION 1 102 #define IP6_ROUTER_ALERT_OPTION 5 103 #define IP6_ROUTER_ALERT_VALUE_MLD 0 104 #ifdef PACK_STRUCT_USE_INCLUDES 105 # include "arch/bpstruct.h" 106 #endif 107 PACK_STRUCT_BEGIN 108 struct ip6_hbh_hdr { 109 /* next header */ 110 PACK_STRUCT_FLD_8(u8_t _nexth); 111 /* header length */ 112 PACK_STRUCT_FLD_8(u8_t _hlen); 113 /* router alert option type */ 114 PACK_STRUCT_FLD_8(u8_t _ra_opt_type); 115 /* router alert option data len */ 116 PACK_STRUCT_FLD_8(u8_t _ra_opt_dlen); 117 /* router alert option data */ 118 PACK_STRUCT_FIELD(u16_t _ra_opt_data); 119 /* PadN option type */ 120 PACK_STRUCT_FLD_8(u8_t _padn_opt_type); 121 /* PadN option data len */ 122 PACK_STRUCT_FLD_8(u8_t _padn_opt_dlen); 123 } PACK_STRUCT_STRUCT; 124 PACK_STRUCT_END 125 #ifdef PACK_STRUCT_USE_INCLUDES 126 # include "arch/epstruct.h" 127 #endif 128 129 /* Fragment header. */ 130 #define IP6_FRAG_HLEN 8 131 #define IP6_FRAG_OFFSET_MASK 0xfff8 132 #define IP6_FRAG_MORE_FLAG 0x0001 133 #ifdef PACK_STRUCT_USE_INCLUDES 134 # include "arch/bpstruct.h" 135 #endif 136 PACK_STRUCT_BEGIN 137 struct ip6_frag_hdr { 138 /* next header */ 139 PACK_STRUCT_FLD_8(u8_t _nexth); 140 /* reserved */ 141 PACK_STRUCT_FLD_8(u8_t reserved); 142 /* fragment offset */ 143 PACK_STRUCT_FIELD(u16_t _fragment_offset); 144 /* fragmented packet identification */ 145 PACK_STRUCT_FIELD(u32_t _identification); 146 } PACK_STRUCT_STRUCT; 147 PACK_STRUCT_END 148 #ifdef PACK_STRUCT_USE_INCLUDES 149 # include "arch/epstruct.h" 150 #endif 151 152 #define IP6H_V(hdr) ((lwip_ntohl((hdr)->_v_tc_fl) >> 28) & 0x0f) 153 #define IP6H_TC(hdr) ((lwip_ntohl((hdr)->_v_tc_fl) >> 20) & 0xff) 154 #define IP6H_FL(hdr) (lwip_ntohl((hdr)->_v_tc_fl) & 0x000fffff) 155 #define IP6H_PLEN(hdr) (lwip_ntohs((hdr)->_plen)) 156 #define IP6H_NEXTH(hdr) ((hdr)->_nexth) 157 #define IP6H_NEXTH_P(hdr) ((u8_t *)(hdr) + 6) 158 #define IP6H_HOPLIM(hdr) ((hdr)->_hoplim) 159 160 #define IP6H_VTCFL_SET(hdr, v, tc, fl) (hdr)->_v_tc_fl = (lwip_htonl((((u32_t)(v)) << 28) | (((u32_t)(tc)) << 20) | (fl))) 161 #define IP6H_PLEN_SET(hdr, plen) (hdr)->_plen = lwip_htons(plen) 162 #define IP6H_NEXTH_SET(hdr, nexth) (hdr)->_nexth = (nexth) 163 #define IP6H_HOPLIM_SET(hdr, hl) (hdr)->_hoplim = (u8_t)(hl) 164 165 #ifdef __cplusplus 166 } 167 #endif 168 169 #endif /* LWIP_HDR_PROT_IP6_H */ 170