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ip4.h
00001 /** 00002 * @file 00003 * IPv4 protocol definitions 00004 */ 00005 00006 /* 00007 * Copyright (c) 2001-2004 Swedish Institute of Computer Science. 00008 * All rights reserved. 00009 * 00010 * Redistribution and use in source and binary forms, with or without modification, 00011 * are permitted provided that the following conditions are met: 00012 * 00013 * 1. Redistributions of source code must retain the above copyright notice, 00014 * this list of conditions and the following disclaimer. 00015 * 2. Redistributions in binary form must reproduce the above copyright notice, 00016 * this list of conditions and the following disclaimer in the documentation 00017 * and/or other materials provided with the distribution. 00018 * 3. The name of the author may not be used to endorse or promote products 00019 * derived from this software without specific prior written permission. 00020 * 00021 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 00022 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00023 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 00024 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00025 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 00026 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00027 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00028 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 00029 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 00030 * OF SUCH DAMAGE. 00031 * 00032 * This file is part of the lwIP TCP/IP stack. 00033 * 00034 * Author: Adam Dunkels <adam@sics.se> 00035 * 00036 */ 00037 #ifndef LWIP_HDR_PROT_IP4_H 00038 #define LWIP_HDR_PROT_IP4_H 00039 00040 #include "lwip/arch.h" 00041 #include "lwip/ip4_addr.h" 00042 00043 #ifdef __cplusplus 00044 extern "C" { 00045 #endif 00046 00047 /** This is the packed version of ip4_addr_t, 00048 used in network headers that are itself packed */ 00049 #ifdef PACK_STRUCT_USE_INCLUDES 00050 # include "arch/bpstruct.h" 00051 #endif 00052 PACK_STRUCT_BEGIN 00053 struct ip4_addr_packed { 00054 PACK_STRUCT_FIELD(u32_t addr); 00055 } PACK_STRUCT_STRUCT; 00056 PACK_STRUCT_END 00057 #ifdef PACK_STRUCT_USE_INCLUDES 00058 # include "arch/epstruct.h" 00059 #endif 00060 00061 typedef struct ip4_addr_packed ip4_addr_p_t; 00062 00063 /* Size of the IPv4 header. Same as 'sizeof(struct ip_hdr)'. */ 00064 #define IP_HLEN 20 00065 00066 #ifdef PACK_STRUCT_USE_INCLUDES 00067 # include "arch/bpstruct.h" 00068 #endif 00069 PACK_STRUCT_BEGIN 00070 /* The IPv4 header */ 00071 struct ip_hdr { 00072 /* version / header length */ 00073 PACK_STRUCT_FLD_8(u8_t _v_hl); 00074 /* type of service */ 00075 PACK_STRUCT_FLD_8(u8_t _tos); 00076 /* total length */ 00077 PACK_STRUCT_FIELD(u16_t _len); 00078 /* identification */ 00079 PACK_STRUCT_FIELD(u16_t _id); 00080 /* fragment offset field */ 00081 PACK_STRUCT_FIELD(u16_t _offset); 00082 #define IP_RF 0x8000U /* reserved fragment flag */ 00083 #define IP_DF 0x4000U /* don't fragment flag */ 00084 #define IP_MF 0x2000U /* more fragments flag */ 00085 #define IP_OFFMASK 0x1fffU /* mask for fragmenting bits */ 00086 /* time to live */ 00087 PACK_STRUCT_FLD_8(u8_t _ttl); 00088 /* protocol*/ 00089 PACK_STRUCT_FLD_8(u8_t _proto); 00090 /* checksum */ 00091 PACK_STRUCT_FIELD(u16_t _chksum); 00092 /* source and destination IP addresses */ 00093 PACK_STRUCT_FLD_S(ip4_addr_p_t src); 00094 PACK_STRUCT_FLD_S(ip4_addr_p_t dest); 00095 } PACK_STRUCT_STRUCT; 00096 PACK_STRUCT_END 00097 #ifdef PACK_STRUCT_USE_INCLUDES 00098 # include "arch/epstruct.h" 00099 #endif 00100 00101 /* Macros to get struct ip_hdr fields: */ 00102 #define IPH_V(hdr) ((hdr)->_v_hl >> 4) 00103 #define IPH_HL(hdr) ((hdr)->_v_hl & 0x0f) 00104 #define IPH_TOS(hdr) ((hdr)->_tos) 00105 #define IPH_LEN(hdr) ((hdr)->_len) 00106 #define IPH_ID(hdr) ((hdr)->_id) 00107 #define IPH_OFFSET(hdr) ((hdr)->_offset) 00108 #define IPH_TTL(hdr) ((hdr)->_ttl) 00109 #define IPH_PROTO(hdr) ((hdr)->_proto) 00110 #define IPH_CHKSUM(hdr) ((hdr)->_chksum) 00111 00112 /* Macros to set struct ip_hdr fields: */ 00113 #define IPH_VHL_SET(hdr, v, hl) (hdr)->_v_hl = (u8_t)((((v) << 4) | (hl))) 00114 #define IPH_TOS_SET(hdr, tos) (hdr)->_tos = (tos) 00115 #define IPH_LEN_SET(hdr, len) (hdr)->_len = (len) 00116 #define IPH_ID_SET(hdr, id) (hdr)->_id = (id) 00117 #define IPH_OFFSET_SET(hdr, off) (hdr)->_offset = (off) 00118 #define IPH_TTL_SET(hdr, ttl) (hdr)->_ttl = (u8_t)(ttl) 00119 #define IPH_PROTO_SET(hdr, proto) (hdr)->_proto = (u8_t)(proto) 00120 #define IPH_CHKSUM_SET(hdr, chksum) (hdr)->_chksum = (chksum) 00121 00122 00123 #ifdef __cplusplus 00124 } 00125 #endif 00126 00127 #endif /* LWIP_HDR_PROT_IP4_H */
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