protocol.h

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// protocol consts, see protocol.txt

#define TCPIP_MAX_RECEIVE	238		// Number of bytes allowed in a receive (max)
#define TCPIP_MAX_SEND		252		// Number of bytes allowed in a send (max)

#define TCP_WINDOW_SIZE	    198		// Max tcp data

/* ARP packet type is 0x0806 */
#define EPT_ARP_HIGH    0x08
#define EPT_ARP_LOW     0x06

/* IP packet type is 0x0800 */
#define EPT_IP_HIGH     0x08
#define EPT_IP_LOW      0x00


/* Field offset in an IP packet */
#define EP_DST  0
#define EP_SRC  HW_ALEN
#define EP_TYPE (HW_ALEN + HW_ALEN)
#define EP_DATA (EP_TYPE + 2)     

/* APR packet length */
#define ARP_LENGTH      (8 + HW_ALEN + IP_ALEN + HW_ALEN + IP_ALEN)

/* Internet Protocol (IP) constants */

/* Some assigned protocol numbers */
#define IPT_ICMP    1   /* protocol type for ICMP packets */
#define IPT_IGMP    2   /* protocol type for IGMP packets */
#define IPT_TCP     6   /* protocol type for TCP packets */
#define IPT_EGP     8   /* protocol type for EGP packets */
#define IPT_UDP     17  /* protocol type for UDP packets */
#define IPT_OSPF    89  /* protocol type for OSPF packets */

/* Field offeset in an IP packet */
#define IP_VERLEN   0   /* IP version & header length (in longs) */
#define IP_TOS      1   /* type of service */
#define IP_LEN      2   /* total packet length (in octets) */	
#define IP_ID       4   /* datagram id */
#define IP_FRAGOFF  6   /* fragment offset (in 8-octet's) */
#define IP_TTL      8   /* time to live, in gateway hops */
#define IP_PROTO    9   /* IP protocol */
#define IP_CKSUM    10  /* header checksum */
#define IP_SRC      12  /* IP address of source */
#define IP_DST      16  /* IP address of destination */
#define IP_DATA     20  /* variable length data, minimum IP header length */

#define IP_FIRST_BYTE   0x45
#define IP_VERSION      4   /* current version value */
#define IP_MINHLEN      5   /* minimum header length (in longs) */
#define IP_INIT_TTL     128 /* initial time-to-live value */


/* UDP constants and formats */

/* Field offset of an UDP packet (following the IP header) */
#define UDP_SRC		0	/* source UDP port number */
#define UDP_DST		2	/* destination UDP port number */
#define UDP_LEN		4	/* length of UDP data */
#define UDP_CKSUM	6	/* UDP checksum (0 => none) */
#define UDP_DATA	8	/* data begin in UDP message, and the UDP header length */

#define UDB_LENGTH	4

/* TCP constants and formats */

#define TCP_DATA	20	/* data begin, minimum TCP header length */
#define TCB_LENGTH          28

#define UDP_LOCAL_PORT_HIGH		0x20

#define UDP_DEBUG_PORT_LOW		0x21
#define UDP_TEST_PORT_LOW		0x22

#define DNS_LOCAL_PORT_HIGH		0x24
#define DNS_LOCAL_PORT_LOW		0x23

#define TCP_LOCAL_PORT_HIGH		0x22
#define TCP_UPGRADE_PORT_LOW	0x23


// Wellknown DHCP server and client
#define DHCP_SERVER_PORT_HIGH	0
#define DHCP_SERVER_PORT_LOW	67
#define DHCP_LOCAL_PORT_HIGH	0
#define DHCP_LOCAL_PORT_LOW		68

#define DNS_SERVER_PORT_HIGH	0	
#define DNS_SERVER_PORT_LOW		53


// TCP constant

// Self defined UDP port 

// Self defined TCP port 
//#define SERIAL_SERVER_PORT_HIGH   18
//#define SERIAL_SERVER_PORT_LOW   0x34
// Telnet Server port 
#define TELNET_SERVER_PORT_HIGH		0x00
#define TELNET_SERVER_PORT_LOW		0x17




// email constants
#define DNS_DOMAIN_SIZE		80