ip_frag.h File Reference

#include "lwip/opt.h"
#include "lwip/err.h"
#include "lwip/pbuf.h"
#include "lwip/netif.h"
#include "lwip/ip_addr.h"
#include "lwip/ip.h"

Data Structures
struct	ip_reassdata
struct	pbuf_custom_ref

Macros
#define	IP_TMR_INTERVAL   1000
#define	LWIP_PBUF_CUSTOM_REF_DEFINED
	A custom pbuf that holds a reference to another pbuf, which is freed when this custom pbuf is freed. More...

Functions
err_t	ip_frag (struct pbuf *p, struct netif *netif, ip_addr_t *dest)
	Fragment an IP datagram if too large for the netif. More...
struct pbuf *	ip_reass (struct pbuf *p)
	Reassembles incoming IP fragments into an IP datagram. More...
void	ip_reass_init (void)
void	ip_reass_tmr (void)
	Reassembly timer base function for both NO_SYS == 0 and 1 (!). More...

#define IP_TMR_INTERVAL   1000

Referenced by ip_reass_timer(), and sys_timeouts_init().

#define LWIP_PBUF_CUSTOM_REF_DEFINED

A custom pbuf that holds a reference to another pbuf, which is freed when this custom pbuf is freed.

This is used to create a custom PBUF_REF that points into the original pbuf.

err_t ip_frag	(	struct pbuf *	p,
		struct netif *	netif,
		ip_addr_t *	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

References pbuf_custom::custom_free_function, ERR_MEM, ERR_OK, htons, if(), inet_chksum(), ip_frag(), ip_frag_alloc_pbuf_custom_ref(), ip_frag_free_pbuf_custom_ref(), IP_HLEN, IP_MF, IP_OFFMASK, IP_REASS_DEBUG, ipfrag_free_pbuf_custom(), IPFRAG_STATS_INC, IPH_CHKSUM_SET, IPH_LEN_SET, IPH_OFFSET, IPH_OFFSET_SET, pbuf::len, LWIP_ASSERT, LWIP_DEBUGF, LWIP_MEM_ALIGN, netif::mtu, pbuf::next, ntohs, NULL, pbuf_custom_ref::original, netif::output, pbuf::payload, pbuf_alloc(), pbuf_alloced_custom(), pbuf_cat(), pbuf_chain(), pbuf_copy_partial(), pbuf_free(), pbuf_header(), PBUF_IP, PBUF_LINK, PBUF_RAM, PBUF_RAW, pbuf_realloc(), PBUF_REF, pbuf_ref(), pbuf_custom_ref::pc, snmp_inc_ipfragcreates, snmp_inc_ipfragoks, and pbuf::tot_len.

Referenced by ip_frag(), ip_reass(), and ip_reass_enqueue_new_datagram().

struct pbuf* ip_reass

(

struct pbuf *

p

)

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

References ip_reassdata::datagram_len, ip_reassdata::flags, htons, if(), inet_chksum(), IP_ADDRESSES_AND_ID_MATCH, ip_frag(), IP_HLEN, IP_MF, IP_OFFMASK, ip_reass_chain_frag_into_datagram_and_validate(), IP_REASS_DEBUG, ip_reass_dequeue_datagram(), ip_reass_enqueue_new_datagram(), IP_REASS_FLAG_LASTFRAG, ip_reass_pbufcount, ip_reass_remove_oldest_datagram(), IPFRAG_STATS_INC, IPH_CHKSUM_SET, IPH_HL, IPH_ID, IPH_LEN, IPH_LEN_SET, IPH_OFFSET, IPH_OFFSET_SET, ip_reassdata::iphdr, LWIP_DEBUGF, ip_reassdata::next, ntohs, NULL, ip_reassdata::p, pbuf::payload, pbuf_cat(), pbuf_clen(), pbuf_free(), pbuf_header(), PP_NTOHS, S16_F, snmp_inc_ipreasmreqds, and X16_F.

Referenced by ip_input().

void ip_reass_init

(

void

)

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).

References IP_REASS_DEBUG, ip_reass_free_complete_datagram(), LWIP_DEBUGF, ip_reassdata::next, NULL, reassdatagrams, ip_reassdata::timer, and U16_F.

Referenced by ip_reass_timer().