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ip.h File Reference

IP (Internet Protocol) layer header. More...

Go to the source code of this file.

Data Structures
struct	ip
	The IP packet structure. More...
Defines
#define	IP_V4   4
	IP version 4.
#define	IP_V6   6
	IP version 6.
#define	IP_FRAME_LEN   65535
	Maximum IP frame length.
#define	IP_HEAD_MIN_LEN   20
	Minimum IP header length.
#define	IP_DEFAULT_TTL   64
	Default TTL (Time To Live).
#define	IPPROTO_ICMP   1
	ICMP (Internet Control Message Protocol) packet type.
#define	IPPROTO_IGMP   2
	IGMP (Internet Group Message Protocol) packet type.
#define	IPPROTO_TCP   6
	TCP (Transmition Control Protocol) packet type.
#define	IPPROTO_UDP   17
	UDP (User Datagram Protocol) packet type.
#define	IP_TOS_MIN_DELAY   0x10
	Type of service :: Minimum delay.
#define	IP_TOS_MAX_THRU   0x08
	Type of service :: Maximum throughput.
#define	IP_TOS_MAX_RELY   0x04
	Type of service :: Maximum rely.
#define	IP_TOS_MIN_COST   0x02
	Type of service :: Minimum cost.
#define	IP_FLAG_MF   0x2000
	More Fragments.
#define	IP_FLAG_DF   0x4000
	Don't Fragment.
#define	IP_FLAG_CE   0x8000
	The CE flag.
#define	IP_FLAG_MASK   0x1FFF
	The flag mask.
#define	IP_ADDRESS(a, b, c, d)   ((a) | (b) << 8 | (c) << 16 | (d) << 24)
	Create an IP address in the binary network format from the notation "a.b.c.d".
#define	IP_A(ip)   ((uint8_t) ((ip) >> 24))
	Get the 1st most significant byte of a host-format IP address.
#define	IP_B(ip)   ((uint8_t) ((ip) >> 16))
	Get the 2nd most significant byte of a host-format IP address.
#define	IP_C(ip)   ((uint8_t) ((ip) >> 8))
	Get the 3rd most significant byte of a host-format IP address.
#define	IP_D(ip)   ((uint8_t) ((ip) >> 0))
	Get the less significant byte of a host-format IP address.
#define	INADDR_LOOPBACK   IP_ADDRESS(127, 0, 0, 1)
	Loopback IP address.
#define	INADDR_ANY   IP_ADDRESS(0, 0, 0, 0)
	Null IP address.
#define	INADDR_BROADCAST   IP_ADDRESS(255, 255, 255, 255)
	Broadcast IP address.
Typedefs
typedef uint32_t	in_addr_t
	IP address type (in binary network format).
typedef ip	ip_t
	The IP packet structure.
Functions
uint16_t	ip_checksum (const void *buf, size_t hdr_len)
	Calculate the IP header checksum. Parameters: buf  The IP header content. hdr_len  The IP header length. Returns: The result of the checksum.
void	set_host_ip_net (in_addr_t ip, in_addr_t netmask)
	Set the IP and netmask for this host. Parameters: ip  The IP address in network format. netmask  The netmask in network format.
in_addr_t	get_host_ip ()
	Get the IP address of this host. Returns: The IP address expressed in network format.
in_addr_t	get_host_netmask ()
	Get the netmask of this host. Returns: The netmask expressed in network format.
in_addr_t	get_host_bcast ()
	Get the broadcast address of the local network. Returns: The broadcast address of this local network expressed in network format.
void	to_ip_layer (ip_t *packet)
	Process an IP packet received from the ethernet layer. Parameters: packet  The IP packet.
int	inet_aton (const char *cp, in_addr_t *inp)
	Converts an internet IP addres from number-and-dot string notation into binary data network byte order. Parameters: cp  The string of the number-and-dot notation IP address. inp  The destination where the binary network byte order address will be put. Returns: Nonzero if the address is valid, zero if not.
int	send_ip_packet (uint32_t ip_to, const void *data, size_t len, uint8_t ttl, uint8_t proto)
	Send an IP packet to the ethernet layer. Parameters: ip_to  The IP destination address in network format. data  The buffer of data to be sent. len  The size of the buffer to be sent. ttl  TTL (Time To Live). proto  The upper-layer protocol type. Returns: The number of bytes sent in case of success; -EMSGSIZE the packet is too big to be sent; -ENOMEM cannot allocate the packet structure; -ENETUNREACH destination address not found;.

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Detailed Description

IP (Internet Protocol) layer header.

Author:

Andrea Righi <drizzt@inwind.it>

Date:

Last update: 2003-11-09

Note:

Copyright (©) 2003 Andrea Righi

Definition in file ip.h.

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Define Documentation

#define IP_DEFAULT_TTL   64

Default TTL (Time To Live). Definition at line 21 of file ip.h.

#define IP_FLAG_CE   0x8000

The CE flag. Definition at line 47 of file ip.h.

#define IP_FLAG_DF   0x4000

Don't Fragment. Definition at line 45 of file ip.h.

#define IP_FLAG_MASK   0x1FFF

The flag mask. Definition at line 49 of file ip.h.

#define IP_FLAG_MF   0x2000

More Fragments. Definition at line 43 of file ip.h.

#define IP_FRAME_LEN   65535

Maximum IP frame length. Definition at line 17 of file ip.h.

#define IP_HEAD_MIN_LEN   20

Minimum IP header length. Definition at line 19 of file ip.h.

#define IP_TOS_MAX_RELY   0x04

Type of service :: Maximum rely. Definition at line 37 of file ip.h.

#define IP_TOS_MAX_THRU   0x08

Type of service :: Maximum throughput. Definition at line 35 of file ip.h.

#define IP_TOS_MIN_COST   0x02

Type of service :: Minimum cost. Definition at line 39 of file ip.h.

#define IP_TOS_MIN_DELAY   0x10

Type of service :: Minimum delay. Definition at line 33 of file ip.h.

#define IP_V4   4

IP version 4. Definition at line 12 of file ip.h.

#define IP_V6   6

IP version 6. Definition at line 14 of file ip.h.

#define IPPROTO_ICMP   1

ICMP (Internet Control Message Protocol) packet type. Definition at line 24 of file ip.h.

#define IPPROTO_IGMP   2

IGMP (Internet Group Message Protocol) packet type. Definition at line 26 of file ip.h.

#define IPPROTO_TCP   6

TCP (Transmition Control Protocol) packet type. Definition at line 28 of file ip.h.

#define IPPROTO_UDP   17

UDP (User Datagram Protocol) packet type. Definition at line 30 of file ip.h.

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