sr_protocol.h File Reference

A collection of macros, structs, and enums to represent packet types and headers. More...

#include <sys/types.h>
#include <arpa/inet.h>

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Classes
struct	sr_icmp_hdr
	General struct of a ICMP header. More...
struct	sr_icmp_t0_hdr
	Struct of a Type-0 (echo reply) ICMP header. More...
struct	sr_icmp_t3_hdr
	Struct of a Type-3 (destination unreachable) ICMP header. More...
struct	sr_icmp_t11_hdr
	Struct of a Type-11 (TTL exceeded) ICMP header. More...
struct	sr_ip_hdr
	Struct of an IP header, without options. More...
struct	sr_ethernet_hdr
	Struct of an Ethernet Header. More...
struct	sr_arp_hdr
	Struct of an ARP header. More...

Macros
#define	IP_MAXPACKET   65535
#define	__LITTLE_ENDIAN   1
#define	__BIG_ENDIAN   2
#define	ICMP_DATA_SIZE   28
#define	ICMP_ZERO_HEADER_SIZE   10
#define	ICMP_ELEVEN_HEADER_SIZE   36
#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
#define	ETHER_ADDR_LEN   6
#define	ICMP_TYPE_ECHO_REPLY   0
#define	ICMP_TYPE_DEST_UNREACH   3
#define	ICMP_TYPE_ECHO_REQUEST   8
#define	ICMP_TYPE_TIME_EXCEEDED   11
#define	ICMP_CODE_NET_UNREACH   0
#define	ICMP_CODE_HOST_UNREACH   1
#define	ICMP_CODE_PROTO_UNREACH   2
#define	ICMP_CODE_PORT_UNREACH   3
#define	ICMP_CODE_TTL_EXPIRED   0
#define	IP_PROTO_ICMP   0x0001
#define	IPV4_HEADER_LEN   20
#define	ICMP_HEADER_LEN   8
#define	sr_IFACE_NAMELEN   32

Typedefs
typedef struct sr_icmp_hdr	sr_icmp_hdr_t
typedef struct sr_icmp_t0_hdr	sr_icmp_t0_hdr_t
typedef struct sr_icmp_t3_hdr	sr_icmp_t3_hdr_t
typedef struct sr_icmp_t11_hdr	sr_icmp_t11_hdr_t
typedef struct sr_ip_hdr	sr_ip_hdr_t
typedef struct sr_ethernet_hdr	sr_ethernet_hdr_t
typedef struct sr_arp_hdr	sr_arp_hdr_t

Enumerations
enum	sr_ip_protocol { ip_protocol_icmp = 0x0001 }
	Enumeration of useful codes for protocols encapsulated in IP.
enum	sr_ethertype { ethertype_arp = 0x0806, ethertype_ip = 0x0800 }
	Enumeration of useful codes for protocols encapsulated in Ethernet.
enum	sr_arp_opcode { arp_op_request = 0x0001, arp_op_reply = 0x0002 }
	Enumeration of useful codes for ARP operations.
enum	sr_arp_hrd_fmt { arp_hrd_ethernet = 0x0001 }
	Enumeration of useful hardware format codes for ARP.

Functions
struct sr_icmp_hdr	__attribute__ ((packed))

Variables
uint8_t	icmp_type
	icmp type
uint8_t	icmp_code
	icmp code, if needed
uint16_t	icmp_sum
	icmp checksum
uint16_t	icmp_id
	icmp identifier, you shouldn't need to use this
uint16_t	icmp_seq
	icmp sequence number, you shouldn't need to use this
uint16_t	timestamp
uint16_t	data [ICMP_DATA_SIZE/2]
uint16_t	unused
uint16_t	next_mtu
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
uint8_t	ip_ttl
	time to live
uint8_t	ip_p
	protocol of encapsulated packet
uint16_t	ip_sum
	IP checksum.
uint32_t	ip_src
	src IP address
uint32_t	ip_dst
	dest IP address
uint8_t	ether_dhost [ETHER_ADDR_LEN]
	destination ethernet address
uint8_t	ether_shost [ETHER_ADDR_LEN]
	source ethernet address
uint16_t	ether_type
	type (protocol) of encapsulated packet
enum sr_ip_protocol	__attribute__
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

Detailed Description

A collection of macros, structs, and enums to represent packet types and headers.