Layer 3 - Internet Protocol (IPv4)

TCP/IP Illustrated Vol I - Chapter 5 - IP RFC 791 More...

Collaboration diagram for Layer 3 - Internet Protocol (IPv4):

Macros
#define	IPV4_VERSION   4
	Version field inside the IP header.
#define	IPV4_MIN_LENGTH   20
	Minimum size of an IP header.
#define	IPV4_DEFAULT_TTL   64
	TTL value used when creating packets.

Functions
struct PACKED	ALIGNED (sizeof(uint16_t)) ipv4_header
	An IPv4 header. More...
static uint16_t	ipv4_fragment_offset (const struct ipv4_header *iphdr)
static bool	ipv4_more_framents (const struct ipv4_header *iphdr)
static bool	ipv4_is_fragmented (const struct ipv4_header *iphdr)
error_t	ipv4_receive_packet (struct packet *packet)
	Process a newly received IP packet.
struct packet *	ipv4_build_packet (const struct net_route *, u8 protocol, const void *payload, size_t)
	Build an IP packet The L2/L3 headers are filled using the routing information.
static __be ipv4_t	IPV4 (uint8_t a, uint8_t b, uint8_t c, uint8_t d)
	Helper to quickly generate an IPv4 address.

Detailed Description

Function Documentation

ALIGNED()

struct PACKED ALIGNED

(

sizeof(uint16_t)

)

Note

All fields are in big endian

ipv4_fragment_offset()

static uint16_t ipv4_fragment_offset ( const struct ipv4_header *  iphdr )

inlinestatic

Returns

An IPv4 fragment's offset

ipv4_is_fragmented()

static bool ipv4_is_fragmented ( const struct ipv4_header *  iphdr )

inlinestatic

Returns

Whether this header's packet is fragmented

ipv4_more_framents()

static bool ipv4_more_framents ( const struct ipv4_header *  iphdr )

inlinestatic

Returns

Whether this header's packet has more fragments remaining