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128 lines
4.2 KiB
C
128 lines
4.2 KiB
C
/**
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* @file
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* IPv4 protocol definitions
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*/
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/*
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* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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#ifndef LWIP_HDR_PROT_IP4_H
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#define LWIP_HDR_PROT_IP4_H
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#include "lwip/arch.h"
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#include "lwip/ip4_addr.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** This is the packed version of ip4_addr_t,
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used in network headers that are itself packed */
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/bpstruct.h"
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#endif
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PACK_STRUCT_BEGIN
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struct ip4_addr_packed {
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PACK_STRUCT_FIELD(u32_t addr);
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} PACK_STRUCT_STRUCT;
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PACK_STRUCT_END
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/epstruct.h"
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#endif
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typedef struct ip4_addr_packed ip4_addr_p_t;
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/* Size of the IPv4 header. Same as 'sizeof(struct ip_hdr)'. */
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#define IP_HLEN 20
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/bpstruct.h"
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#endif
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PACK_STRUCT_BEGIN
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/* The IPv4 header */
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struct ip_hdr {
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/* version / header length */
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PACK_STRUCT_FLD_8(u8_t _v_hl);
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/* type of service */
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PACK_STRUCT_FLD_8(u8_t _tos);
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/* total length */
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PACK_STRUCT_FIELD(u16_t _len);
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/* identification */
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PACK_STRUCT_FIELD(u16_t _id);
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/* fragment offset field */
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PACK_STRUCT_FIELD(u16_t _offset);
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#define IP_RF 0x8000U /* reserved fragment flag */
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#define IP_DF 0x4000U /* don't fragment flag */
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#define IP_MF 0x2000U /* more fragments flag */
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#define IP_OFFMASK 0x1fffU /* mask for fragmenting bits */
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/* time to live */
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PACK_STRUCT_FLD_8(u8_t _ttl);
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/* protocol*/
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PACK_STRUCT_FLD_8(u8_t _proto);
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/* checksum */
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PACK_STRUCT_FIELD(u16_t _chksum);
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/* source and destination IP addresses */
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PACK_STRUCT_FLD_S(ip4_addr_p_t src);
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PACK_STRUCT_FLD_S(ip4_addr_p_t dest);
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} PACK_STRUCT_STRUCT;
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PACK_STRUCT_END
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/epstruct.h"
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#endif
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/* Macros to get struct ip_hdr fields: */
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#define IPH_V(hdr) ((hdr)->_v_hl >> 4)
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#define IPH_HL(hdr) ((hdr)->_v_hl & 0x0f)
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#define IPH_TOS(hdr) ((hdr)->_tos)
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#define IPH_LEN(hdr) ((hdr)->_len)
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#define IPH_ID(hdr) ((hdr)->_id)
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#define IPH_OFFSET(hdr) ((hdr)->_offset)
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#define IPH_TTL(hdr) ((hdr)->_ttl)
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#define IPH_PROTO(hdr) ((hdr)->_proto)
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#define IPH_CHKSUM(hdr) ((hdr)->_chksum)
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/* Macros to set struct ip_hdr fields: */
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#define IPH_VHL_SET(hdr, v, hl) (hdr)->_v_hl = (u8_t)((((v) << 4) | (hl)))
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#define IPH_TOS_SET(hdr, tos) (hdr)->_tos = (tos)
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#define IPH_LEN_SET(hdr, len) (hdr)->_len = (len)
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#define IPH_ID_SET(hdr, id) (hdr)->_id = (id)
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#define IPH_OFFSET_SET(hdr, off) (hdr)->_offset = (off)
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#define IPH_TTL_SET(hdr, ttl) (hdr)->_ttl = (u8_t)(ttl)
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#define IPH_PROTO_SET(hdr, proto) (hdr)->_proto = (u8_t)(proto)
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#define IPH_CHKSUM_SET(hdr, chksum) (hdr)->_chksum = (chksum)
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#ifdef __cplusplus
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}
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#endif
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#endif /* LWIP_HDR_PROT_IP4_H */
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