sr_protocol.h

/*
 *  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>

#include "sr_if.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
  {
/***************************************************************************/
    //struct sr_ethernet_hdr* ether_hrd;  /* eathernet header */
/***************************************************************************/

#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.
 */
struct sr_ethernet_hdr
{
#ifndef ETHER_ADDR_LEN
#define ETHER_ADDR_LEN 6
#endif
    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 IP_NO_FRAGMENT
#define IP_NO_FRAGMENT 0x4000
#endif


#ifndef IP_ADDR_LEN
#define IP_ADDR_LEN 4
#endif

#ifndef ARPHDR_ETHER
#define ARPHDR_ETHER    1
#endif

#ifndef IPPROTO_ICMP
#define IPPROTO_ICMP            0x0001  /* ICMP protocol */
#endif

#ifndef IP_PROTO_ICMP
#define IP_PROTO_ICMP           1  /* ICMP protocol */
#endif

#ifndef IP_PROTO_TCP
#define IP_PROTO_TCP            6  /* TCP protocol */
#endif

#ifndef IP_PROTO_UDP
#define IP_PROTO_UDP            17  /* UDP protocol */
#endif

#ifndef IP_PROTO_OSPFv2
#define IP_PROTO_OSPFv2         89  /* OSPFv2 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

struct sr_arphdr
{
/***************************************************************************/
    //struct sr_ethernet_hdr* ether_hrd;  /* eathernet header */
/***************************************************************************/

    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)         */
    unsigned char   ar_sha[ETHER_ADDR_LEN];   /* sender hardware address      */
    uint32_t        ar_sip;             /* sender IP address            */
    unsigned char   ar_tha[ETHER_ADDR_LEN];   /* target hardware address      */
    uint32_t        ar_tip;             /* target IP address            */
} __attribute__ ((packed)) ;



/***************************************************************************/
#define ICMP_ECHO_REQUEST_TYPE 8
#define ICMP_ECHO_REQUEST_CODE 0

#define ICMP_ECHO_REPLY_TYPE 0
#define ICMP_ECHO_REPLY_CODE 0

#define ICMP_DESTINATION_UNREACHABLE_TYPE 3
#define ICMP_HOST_UNREACHABLE_CODE 1
#define ICMP_PORT_UNREACHABLE_CODE 3

#define ICMP_TIME_EXCEEDED_TYPE 11
#define ICMP_TIME_EXCEEDED_CODE 0



struct sr_icmphdr
{
    //struct ip* ip_hrd;          /* ip header */

    uint8_t   type;             /* type of the ICMP   */
    uint8_t   code;             /* code of the ICMO   */
    uint16_t  cksum;            /* checksum           */
    uint16_t  id;               /* identification     */
    uint16_t  seq_n;            /* sequence number    */
} __attribute__ ((packed)) ;


#define ARP_REQUESTS_NUM 5
#define ARP_REQUEST_PKT_LEN 42

struct sr_arp_thread_param
{
    struct sr_instance* sr;
    uint8_t   counter;
    uint8_t   packet[ARP_REQUEST_PKT_LEN];
    char interface[sr_IFACE_NAMELEN];
    uint32_t target_ip;
} __attribute__ ((packed)) ;
/***************************************************************************/



#endif /* -- SR_PROTOCOL_H -- */