ip_frag.c File Reference

Data Structures
struct	ip_reass_helper
Functions
void	ip_reass_tmr (void)
struct pbuf *	ip_reass (struct pbuf *p)
err_t	ip_frag (struct pbuf *p, struct netif *netif, struct ip_addr *dest)

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Detailed Description

This is the IPv4 packet segmentation and reassembly implementation.

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Function Documentation

err_t ip_frag	(	struct pbuf *	p,
		struct netif *	netif,
		struct ip_addr *	dest
	)

Fragment an IP datagram if too large for the netif.

Chop the datagram in MTU sized chunks and send them in order by using a fixed size static memory buffer (PBUF_REF) or point PBUF_REFs into p (depending on IP_FRAG_USES_STATIC_BUF).

Parameters:

	p	ip packet to send
	netif	the netif on which to send
	dest	destination ip address to which to send

Returns:

ERR_OK if sent successfully, err_t otherwise

struct pbuf* ip_reass

(

struct pbuf *

p

)

[read]

Reassembles incoming IP fragments into an IP datagram.

Parameters:

p

points to a pbuf chain of the fragment

Returns:

NULL if reassembly is incomplete, ? otherwise

void ip_reass_tmr

(

void

)

Reassembly timer base function for both NO_SYS == 0 and 1 (!).

Should be called every 1000 msec (defined by IP_TMR_INTERVAL).

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