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sr_protocol.h
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sr_protocol.h
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/*
* Copyright (c) 1998, 1999, 2000 Mike D. Schiffman <mike@infonexus.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/**
* sr_protocol.h
*
*/
#ifndef SR_PROTOCOL_H
#define SR_PROTOCOL_H
#ifdef _LINUX_
#include <stdint.h>
#endif /* _LINUX_ */
#include <sys/types.h>
#include <arpa/inet.h>
#ifndef IP_MAXPACKET
#define IP_MAXPACKET 65535
#endif
/* FIXME
* ohh how lame .. how very, very lame... how can I ever go out in public
* again?! /mc
*/
#ifndef __LITTLE_ENDIAN
#define __LITTLE_ENDIAN 1
#endif
#ifndef __BIG_ENDIAN
#define __BIG_ENDIAN 2
#endif
#ifdef _CYGWIN_
#ifndef __BYTE_ORDER
#define __BYTE_ORDER __LITTLE_ENDIAN
#endif
#endif
#ifdef _LINUX_
#ifndef __BYTE_ORDER
#define __BYTE_ORDER __LITTLE_ENDIAN
#endif
#endif
#ifdef _SOLARIS_
#ifndef __BYTE_ORDER
#define __BYTE_ORDER __BIG_ENDIAN
#endif
#endif
#ifdef _DARWIN_
#ifndef __BYTE_ORDER
#define __BYTE_ORDER __BIG_ENDIAN
#endif
#endif
/*
* Structure of an internet header, naked of options.
*/
struct ip
{
#if __BYTE_ORDER == __LITTLE_ENDIAN
unsigned int ip_hl:4; /* header length */
unsigned int ip_v:4; /* version */
#elif __BYTE_ORDER == __BIG_ENDIAN
unsigned int ip_v:4; /* version */
unsigned int ip_hl:4; /* header length */
#else
#error "Byte ordering not specified "
#endif
uint8_t ip_tos; /* type of service */
uint16_t ip_len; /* total length */
uint16_t ip_id; /* identification */
uint16_t ip_off; /* fragment offset field */
#define IP_RF 0x8000 /* reserved fragment flag */
#define IP_DF 0x4000 /* dont fragment flag */
#define IP_MF 0x2000 /* more fragments flag */
#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
uint8_t ip_ttl; /* time to live */
uint8_t ip_p; /* protocol */
uint16_t ip_sum; /* checksum */
struct in_addr ip_src, ip_dst; /* source and dest address */
} __attribute__ ((packed)) ;
/*
* Ethernet packet header prototype. Too many O/S's define this differently.
* Easy enough to solve that and define it here.
*/
#ifndef ETHER_ADDR_LEN
#define ETHER_ADDR_LEN 6
#endif
#ifndef IP_ADDR_LEN
#define IP_ADDR LEN 4
#endif
struct sr_ethernet_hdr
{
uint8_t ether_dhost[ETHER_ADDR_LEN]; /* destination ethernet address */
uint8_t ether_shost[ETHER_ADDR_LEN]; /* source ethernet address */
uint16_t ether_type; /* packet type ID */
} __attribute__ ((packed)) ;
#ifndef ARPHDR_ETHER
#define ARPHDR_ETHER 1
#endif
#ifndef IPPROTO_ICMP
#define IPPROTO_ICMP 0x0001 /* ICMP protocol */
#endif
#ifndef IPPROTO_TCP
#define IPPROTO_TCP 0x0006 /* ICMP protocol */
#endif
#ifndef IPPROTO_UDP
#define IPPROTO_UDP 0x0017 /* ICMP protocol */
#endif
#ifndef ETHERTYPE_IP
#define ETHERTYPE_IP 0x0800 /* IP protocol */
#endif
#ifndef ETHERTYPE_ARP
#define ETHERTYPE_ARP 0x0806 /* Addr. resolution protocol */
#endif
#define ARP_REQUEST 1
#define ARP_REPLY 2
#define ETH_HDR_LEN 14
struct sr_arphdr
{
unsigned short ar_hrd; /* format of hardware address */
unsigned short ar_pro; /* format of protocol address */
unsigned char ar_hln; /* length of hardware address */
unsigned char ar_pln; /* length of protocol address */
unsigned short ar_op; /* ARP opcode (command) */
uint8_t ar_sha[ETHER_ADDR_LEN]; /* sender hardware address */
uint32_t ar_sip; /* sender IP address */
uint8_t ar_tha[ETHER_ADDR_LEN]; /* target hardware address */
uint32_t ar_tip; /* target IP address */
} __attribute__ ((packed)) ;
struct sr_eth_pkt {
struct sr_ethernet_hdr* header; /* keep a copy of the original header */
uint8_t* payload; /* */
};
struct sr_ip_pkt
{
struct ip* header;
uint8_t* payload;
}__attribute__((packed));
struct sr_icmp_hdr
{
//struct sr_icmp_hdr header;
uint8_t type;
uint8_t code;
uint16_t checksum;
uint16_t field1;
uint16_t field2;
}__attribute__ ((packed)) ;
#endif /* -- SR_PROTOCOL_H -- */