autoip.c File Reference

#include "lwip/opt.h"
#include "lwip/mem.h"
#include "lwip/ip_addr.h"
#include "lwip/netif.h"
#include "lwip/autoip.h"
#include "lwip/etharp.h"
#include "lwip/prot/autoip.h"
#include <string.h>

Macros
#define	LWIP_AUTOIP_RAND(netif)
#define	LWIP_AUTOIP_CREATE_SEED_ADDR(netif)

Functions
void	autoip_set_struct (struct netif *netif, struct autoip *autoip)
err_t	autoip_start (struct netif *netif)
void	autoip_network_changed (struct netif *netif)
err_t	autoip_stop (struct netif *netif)
void	autoip_tmr (void)
void	autoip_arp_reply (struct netif *netif, struct etharp_hdr *hdr)
u8_t	autoip_supplied_address (const struct netif *netif)

Detailed Description

AutoIP Automatic LinkLocal IP Configuration

This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform with RFC 3927.

Macro Definition Documentation

LWIP_AUTOIP_CREATE_SEED_ADDR

#define LWIP_AUTOIP_CREATE_SEED_ADDR

(

netif

)

Value:

lwip_htonl(AUTOIP_RANGE_START + ((u32_t)(((u8_t)(netif->hwaddr[4])) | \
                 ((u32_t)((u8_t)(netif->hwaddr[5]))) << 8)))

Macro that generates the initial IP address to be tried by AUTOIP. If you want to override this, define it to something else in lwipopts.h.

LWIP_AUTOIP_RAND

#define LWIP_AUTOIP_RAND

(

netif

)

Value:

( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) | \
                                   ((u32_t)((netif->hwaddr[3]) & 0xff) << 16) | \
                                   ((u32_t)((netif->hwaddr[2]) & 0xff) << 8) | \
                                   ((u32_t)((netif->hwaddr[4]) & 0xff))) + \
                                   (netif_autoip_data(netif)? netif_autoip_data(netif)->tried_llipaddr : 0))

Pseudo random macro based on netif informations. You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h

Function Documentation

autoip_arp_reply()

void autoip_arp_reply	(	struct netif *	netif,
		struct etharp_hdr *	hdr
	)

Handles every incoming ARP Packet, called by etharp_input().

Parameters

netif	network interface to use for autoip processing
hdr	Incoming ARP packet

autoip_network_changed()

void autoip_network_changed

(

struct netif *

netif

)

Handle a possible change in the network configuration.

If there is an AutoIP address configured, take the interface down and begin probing with the same address.

autoip_supplied_address()

u8_t autoip_supplied_address

(

const struct netif *

netif

)

check if AutoIP supplied netif->ip_addr

Parameters

netif

the netif to check

Returns

1 if AutoIP supplied netif->ip_addr (state BOUND or ANNOUNCING), 0 otherwise

autoip_tmr()

void autoip_tmr

(

void

)

Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds