ip.c File Reference

#include "lwip/opt.h"
#include "lwip/def.h"
#include "lwip/mem.h"
#include "lwip/ip.h"
#include "lwip/ip_frag.h"
#include "lwip/inet.h"
#include "lwip/netif.h"
#include "lwip/icmp.h"
#include "lwip/raw.h"
#include "lwip/udp.h"
#include "lwip/tcp.h"
#include "lwip/stats.h"
#include "arch/perf.h"
#include "lwip/snmp.h"

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Functions
void	ip_init (void)
struct netif *	ip_route (struct ip_addr *dest)
err_t	ip_input (struct pbuf *p, struct netif *inp)
err_t	ip_output_if (struct pbuf *p, struct ip_addr *src, struct ip_addr *dest, u8_t ttl, u8_t tos, u8_t proto, struct netif *netif)
err_t	ip_output (struct pbuf *p, struct ip_addr *src, struct ip_addr *dest, u8_t ttl, u8_t tos, u8_t proto)

Function Documentation

ip_init()

void ip_init

(

void

)

Initializes the IP layer.

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ip_input()

err_t ip_input	(	struct pbuf *	p,
		struct netif *	inp
	)

This function is called by the network interface device driver when an IP packet is received. The function does the basic checks of the IP header such as packet size being at least larger than the header size etc. If the packet was not destined for us, the packet is forwarded (using ip_forward). The IP checksum is always checked.

Finally, the packet is sent to the upper layer protocol input function.

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ip_output()

err_t ip_output	(	struct pbuf *	p,
		struct ip_addr *	src,
		struct ip_addr *	dest,
		u8_t	ttl,
		u8_t	tos,
		u8_t	proto
	)

Simple interface to ip_output_if. It finds the outgoing network interface and calls upon ip_output_if to do the actual work.

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ip_output_if()

err_t ip_output_if	(	struct pbuf *	p,
		struct ip_addr *	src,
		struct ip_addr *	dest,
		u8_t	ttl,
		u8_t	tos,
		u8_t	proto,
		struct netif *	netif
	)

Sends an IP packet on a network interface. This function constructs the IP header and calculates the IP header checksum. If the source IP address is NULL, the IP address of the outgoing network interface is filled in as source address.

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ip_route()

struct netif* ip_route

(

struct ip_addr *

dest

)

Finds the appropriate network interface for a given IP address. It searches the list of network interfaces linearly. A match is found if the masked IP address of the network interface equals the masked IP address given to the function.

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