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/**
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* @file
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* AutoIP Automatic LinkLocal IP Configuration
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*
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*/
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/*
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*
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* Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* Author: Dominik Spies <kontakt@dspies.de>
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*
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* This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
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* with RFC 3927.
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*
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*
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* Please coordinate changes and requests with Dominik Spies
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* <kontakt@dspies.de>
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*/
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/*******************************************************************************
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* USAGE:
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*
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* define LWIP_AUTOIP 1 in your lwipopts.h
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*
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* If you don't use tcpip.c (so, don't call, you don't call tcpip_init):
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* - First, call autoip_init().
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* - call autoip_tmr() all AUTOIP_TMR_INTERVAL msces,
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* that should be defined in autoip.h.
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* I recommend a value of 100. The value must divide 1000 with a remainder almost 0.
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* Possible values are 1000, 500, 333, 250, 200, 166, 142, 125, 111, 100 ....
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*
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* Without DHCP:
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* - Call autoip_start() after netif_add().
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*
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* With DHCP:
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* - define LWIP_DHCP_AUTOIP_COOP 1 in your lwipopts.h.
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* - Configure your DHCP Client.
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*
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*/
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#include "lwip/opt.h"
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#if LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */
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#include "lwip/mem.h"
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#include "lwip/udp.h"
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#include "lwip/ip_addr.h"
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#include "lwip/netif.h"
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#include "lwip/autoip.h"
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#include "netif/etharp.h"
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#include <stdlib.h>
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#include <string.h>
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/* 169.254.0.0 */
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#define AUTOIP_NET 0xA9FE0000
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/* 169.254.1.0 */
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#define AUTOIP_RANGE_START (AUTOIP_NET | 0x0100)
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/* 169.254.254.255 */
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#define AUTOIP_RANGE_END (AUTOIP_NET | 0xFEFF)
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/** Pseudo random macro based on netif informations.
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* You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */
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#ifndef LWIP_AUTOIP_RAND
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#define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) | \
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((u32_t)((netif->hwaddr[3]) & 0xff) << 16) | \
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((u32_t)((netif->hwaddr[2]) & 0xff) << 8) | \
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((u32_t)((netif->hwaddr[4]) & 0xff))) + \
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(netif->autoip?netif->autoip->tried_llipaddr:0))
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#endif /* LWIP_AUTOIP_RAND */
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/**
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* Macro that generates the initial IP address to be tried by AUTOIP.
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* If you want to override this, define it to something else in lwipopts.h.
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*/
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#ifndef LWIP_AUTOIP_CREATE_SEED_ADDR
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#define LWIP_AUTOIP_CREATE_SEED_ADDR(netif) \
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htonl(AUTOIP_RANGE_START + ((u32_t)(((u8_t)(netif->hwaddr[4])) | \
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((u32_t)((u8_t)(netif->hwaddr[5]))) << 8)))
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#endif /* LWIP_AUTOIP_CREATE_SEED_ADDR */
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/* static functions */
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static void autoip_handle_arp_conflict(struct netif *netif);
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/* creates a pseudo random LL IP-Address for a network interface */
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static void autoip_create_addr(struct netif *netif, ip_addr_t *ipaddr);
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/* sends an ARP probe */
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static err_t autoip_arp_probe(struct netif *netif);
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/* sends an ARP announce */
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static err_t autoip_arp_announce(struct netif *netif);
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/* configure interface for use with current LL IP-Address */
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static err_t autoip_bind(struct netif *netif);
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/* start sending probes for llipaddr */
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static void autoip_start_probing(struct netif *netif);
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/**
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* Initialize this module
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*/
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void
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autoip_init(void)
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{
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LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_init()\n"));
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}
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/** Set a statically allocated struct autoip to work with.
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* Using this prevents autoip_start to allocate it using mem_malloc.
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*
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* @param netif the netif for which to set the struct autoip
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* @param dhcp (uninitialised) dhcp struct allocated by the application
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*/
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void
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autoip_set_struct(struct netif *netif, struct autoip *autoip)
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{
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LWIP_ASSERT("netif != NULL", netif != NULL);
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LWIP_ASSERT("autoip != NULL", autoip != NULL);
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LWIP_ASSERT("netif already has a struct autoip set", netif->autoip == NULL);
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/* clear data structure */
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memset(autoip, 0, sizeof(struct autoip));
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/* autoip->state = AUTOIP_STATE_OFF; */
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netif->autoip = autoip;
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}
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153
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/** Restart AutoIP client and check the next address (conflict detected)
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*
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* @param netif The netif under AutoIP control
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*/
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static void
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autoip_restart(struct netif *netif)
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{
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netif->autoip->tried_llipaddr++;
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autoip_start(netif);
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}
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163
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| mbed714 |
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164
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/**
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* Handle a IP address conflict after an ARP conflict detection
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166
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*/
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static void
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autoip_handle_arp_conflict(struct netif *netif)
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169
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{
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170
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/* Somehow detect if we are defending or retreating */
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unsigned char defend = 1; /* tbd */
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if(defend) {
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if(netif->autoip->lastconflict > 0) {
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/* retreat, there was a conflicting ARP in the last
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* DEFEND_INTERVAL seconds
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177
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*/
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178
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LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
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("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n"));
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180
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181
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/* TODO: close all TCP sessions */
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autoip_restart(netif);
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} else {
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LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
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("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n"));
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autoip_arp_announce(netif);
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netif->autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_TICKS_PER_SECOND;
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}
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} else {
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LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
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("autoip_handle_arp_conflict(): we do not defend, retreating\n"));
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/* TODO: close all TCP sessions */
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autoip_restart(netif);
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}
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}
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/**
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* Create an IP-Address out of range 169.254.1.0 to 169.254.254.255
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199
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*
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200
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* @param netif network interface on which create the IP-Address
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201
|
* @param ipaddr ip address to initialize
|
| mbed714 |
0:d616ece2d859
|
202
|
*/
|
| mbed714 |
0:d616ece2d859
|
203
|
static void
|
| mbed714 |
0:d616ece2d859
|
204
|
autoip_create_addr(struct netif *netif, ip_addr_t *ipaddr)
|
| mbed714 |
0:d616ece2d859
|
205
|
{
|
| mbed714 |
0:d616ece2d859
|
206
|
/* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255
|
| mbed714 |
0:d616ece2d859
|
207
|
* compliant to RFC 3927 Section 2.1
|
| mbed714 |
0:d616ece2d859
|
208
|
* We have 254 * 256 possibilities */
|
| mbed714 |
0:d616ece2d859
|
209
|
|
| mbed714 |
0:d616ece2d859
|
210
|
u32_t addr = ntohl(LWIP_AUTOIP_CREATE_SEED_ADDR(netif));
|
| mbed714 |
0:d616ece2d859
|
211
|
addr += netif->autoip->tried_llipaddr;
|
| mbed714 |
0:d616ece2d859
|
212
|
addr = AUTOIP_NET | (addr & 0xffff);
|
| mbed714 |
0:d616ece2d859
|
213
|
/* Now, 169.254.0.0 <= addr <= 169.254.255.255 */
|
| mbed714 |
0:d616ece2d859
|
214
|
|
| mbed714 |
0:d616ece2d859
|
215
|
if (addr < AUTOIP_RANGE_START) {
|
| mbed714 |
0:d616ece2d859
|
216
|
addr += AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
|
| mbed714 |
0:d616ece2d859
|
217
|
}
|
| mbed714 |
0:d616ece2d859
|
218
|
if (addr > AUTOIP_RANGE_END) {
|
| mbed714 |
0:d616ece2d859
|
219
|
addr -= AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
|
| mbed714 |
0:d616ece2d859
|
220
|
}
|
| mbed714 |
0:d616ece2d859
|
221
|
LWIP_ASSERT("AUTOIP address not in range", (addr >= AUTOIP_RANGE_START) &&
|
| mbed714 |
0:d616ece2d859
|
222
|
(addr <= AUTOIP_RANGE_END));
|
| mbed714 |
0:d616ece2d859
|
223
|
ip4_addr_set_u32(ipaddr, htonl(addr));
|
| mbed714 |
0:d616ece2d859
|
224
|
|
| mbed714 |
0:d616ece2d859
|
225
|
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
|
| mbed714 |
0:d616ece2d859
|
226
|
("autoip_create_addr(): tried_llipaddr=%"U16_F", %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
|
| mbed714 |
0:d616ece2d859
|
227
|
(u16_t)(netif->autoip->tried_llipaddr), ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr),
|
| mbed714 |
0:d616ece2d859
|
228
|
ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
|
| mbed714 |
0:d616ece2d859
|
229
|
}
|
| mbed714 |
0:d616ece2d859
|
230
|
|
| mbed714 |
0:d616ece2d859
|
231
|
/**
|
| mbed714 |
0:d616ece2d859
|
232
|
* Sends an ARP probe from a network interface
|
| mbed714 |
0:d616ece2d859
|
233
|
*
|
| mbed714 |
0:d616ece2d859
|
234
|
* @param netif network interface used to send the probe
|
| mbed714 |
0:d616ece2d859
|
235
|
*/
|
| mbed714 |
0:d616ece2d859
|
236
|
static err_t
|
| mbed714 |
0:d616ece2d859
|
237
|
autoip_arp_probe(struct netif *netif)
|
| mbed714 |
0:d616ece2d859
|
238
|
{
|
| mbed714 |
0:d616ece2d859
|
239
|
return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, ðbroadcast,
|
| mbed714 |
0:d616ece2d859
|
240
|
(struct eth_addr *)netif->hwaddr, IP_ADDR_ANY, ðzero,
|
| mbed714 |
0:d616ece2d859
|
241
|
&netif->autoip->llipaddr, ARP_REQUEST);
|
| mbed714 |
0:d616ece2d859
|
242
|
}
|
| mbed714 |
0:d616ece2d859
|
243
|
|
| mbed714 |
0:d616ece2d859
|
244
|
/**
|
| mbed714 |
0:d616ece2d859
|
245
|
* Sends an ARP announce from a network interface
|
| mbed714 |
0:d616ece2d859
|
246
|
*
|
| mbed714 |
0:d616ece2d859
|
247
|
* @param netif network interface used to send the announce
|
| mbed714 |
0:d616ece2d859
|
248
|
*/
|
| mbed714 |
0:d616ece2d859
|
249
|
static err_t
|
| mbed714 |
0:d616ece2d859
|
250
|
autoip_arp_announce(struct netif *netif)
|
| mbed714 |
0:d616ece2d859
|
251
|
{
|
| mbed714 |
0:d616ece2d859
|
252
|
return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, ðbroadcast,
|
| mbed714 |
0:d616ece2d859
|
253
|
(struct eth_addr *)netif->hwaddr, &netif->autoip->llipaddr, ðzero,
|
| mbed714 |
0:d616ece2d859
|
254
|
&netif->autoip->llipaddr, ARP_REQUEST);
|
| mbed714 |
0:d616ece2d859
|
255
|
}
|
| mbed714 |
0:d616ece2d859
|
256
|
|
| mbed714 |
0:d616ece2d859
|
257
|
/**
|
| mbed714 |
0:d616ece2d859
|
258
|
* Configure interface for use with current LL IP-Address
|
| mbed714 |
0:d616ece2d859
|
259
|
*
|
| mbed714 |
0:d616ece2d859
|
260
|
* @param netif network interface to configure with current LL IP-Address
|
| mbed714 |
0:d616ece2d859
|
261
|
*/
|
| mbed714 |
0:d616ece2d859
|
262
|
static err_t
|
| mbed714 |
0:d616ece2d859
|
263
|
autoip_bind(struct netif *netif)
|
| mbed714 |
0:d616ece2d859
|
264
|
{
|
| mbed714 |
0:d616ece2d859
|
265
|
struct autoip *autoip = netif->autoip;
|
| mbed714 |
0:d616ece2d859
|
266
|
ip_addr_t sn_mask, gw_addr;
|
| mbed714 |
0:d616ece2d859
|
267
|
|
| mbed714 |
0:d616ece2d859
|
268
|
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
|
| mbed714 |
0:d616ece2d859
|
269
|
("autoip_bind(netif=%p) %c%c%"U16_F" %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
|
| mbed714 |
0:d616ece2d859
|
270
|
(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num,
|
| mbed714 |
0:d616ece2d859
|
271
|
ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr),
|
| mbed714 |
0:d616ece2d859
|
272
|
ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr)));
|
| mbed714 |
0:d616ece2d859
|
273
|
|
| mbed714 |
0:d616ece2d859
|
274
|
IP4_ADDR(&sn_mask, 255, 255, 0, 0);
|
| mbed714 |
0:d616ece2d859
|
275
|
IP4_ADDR(&gw_addr, 0, 0, 0, 0);
|
| mbed714 |
0:d616ece2d859
|
276
|
|
| mbed714 |
0:d616ece2d859
|
277
|
netif_set_ipaddr(netif, &autoip->llipaddr);
|
| mbed714 |
0:d616ece2d859
|
278
|
netif_set_netmask(netif, &sn_mask);
|
| mbed714 |
0:d616ece2d859
|
279
|
netif_set_gw(netif, &gw_addr);
|
| mbed714 |
0:d616ece2d859
|
280
|
|
| mbed714 |
0:d616ece2d859
|
281
|
/* bring the interface up */
|
| mbed714 |
0:d616ece2d859
|
282
|
netif_set_up(netif);
|
| mbed714 |
0:d616ece2d859
|
283
|
|
| mbed714 |
0:d616ece2d859
|
284
|
return ERR_OK;
|
| mbed714 |
0:d616ece2d859
|
285
|
}
|
| mbed714 |
0:d616ece2d859
|
286
|
|
| mbed714 |
0:d616ece2d859
|
287
|
/**
|
| mbed714 |
0:d616ece2d859
|
288
|
* Start AutoIP client
|
| mbed714 |
0:d616ece2d859
|
289
|
*
|
| mbed714 |
0:d616ece2d859
|
290
|
* @param netif network interface on which start the AutoIP client
|
| mbed714 |
0:d616ece2d859
|
291
|
*/
|
| mbed714 |
0:d616ece2d859
|
292
|
err_t
|
| mbed714 |
0:d616ece2d859
|
293
|
autoip_start(struct netif *netif)
|
| mbed714 |
0:d616ece2d859
|
294
|
{
|
| mbed714 |
0:d616ece2d859
|
295
|
struct autoip *autoip = netif->autoip;
|
| mbed714 |
0:d616ece2d859
|
296
|
err_t result = ERR_OK;
|
| mbed714 |
0:d616ece2d859
|
297
|
|
| mbed714 |
0:d616ece2d859
|
298
|
if(netif_is_up(netif)) {
|
| mbed714 |
0:d616ece2d859
|
299
|
netif_set_down(netif);
|
| mbed714 |
0:d616ece2d859
|
300
|
}
|
| mbed714 |
0:d616ece2d859
|
301
|
|
| mbed714 |
0:d616ece2d859
|
302
|
/* Set IP-Address, Netmask and Gateway to 0 to make sure that
|
| mbed714 |
0:d616ece2d859
|
303
|
* ARP Packets are formed correctly
|
| mbed714 |
0:d616ece2d859
|
304
|
*/
|
| mbed714 |
0:d616ece2d859
|
305
|
ip_addr_set_zero(&netif->ip_addr);
|
| mbed714 |
0:d616ece2d859
|
306
|
ip_addr_set_zero(&netif->netmask);
|
| mbed714 |
0:d616ece2d859
|
307
|
ip_addr_set_zero(&netif->gw);
|
| mbed714 |
0:d616ece2d859
|
308
|
|
| mbed714 |
0:d616ece2d859
|
309
|
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
|
| mbed714 |
0:d616ece2d859
|
310
|
("autoip_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0],
|
| mbed714 |
0:d616ece2d859
|
311
|
netif->name[1], (u16_t)netif->num));
|
| mbed714 |
0:d616ece2d859
|
312
|
if(autoip == NULL) {
|
| mbed714 |
0:d616ece2d859
|
313
|
/* no AutoIP client attached yet? */
|
| mbed714 |
0:d616ece2d859
|
314
|
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
|
| mbed714 |
0:d616ece2d859
|
315
|
("autoip_start(): starting new AUTOIP client\n"));
|
| mbed714 |
0:d616ece2d859
|
316
|
autoip = (struct autoip *)mem_malloc(sizeof(struct autoip));
|
| mbed714 |
0:d616ece2d859
|
317
|
if(autoip == NULL) {
|
| mbed714 |
0:d616ece2d859
|
318
|
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
|
| mbed714 |
0:d616ece2d859
|
319
|
("autoip_start(): could not allocate autoip\n"));
|
| mbed714 |
0:d616ece2d859
|
320
|
return ERR_MEM;
|
| mbed714 |
0:d616ece2d859
|
321
|
}
|
| mbed714 |
0:d616ece2d859
|
322
|
memset(autoip, 0, sizeof(struct autoip));
|
| mbed714 |
0:d616ece2d859
|
323
|
/* store this AutoIP client in the netif */
|
| mbed714 |
0:d616ece2d859
|
324
|
netif->autoip = autoip;
|
| mbed714 |
0:d616ece2d859
|
325
|
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_start(): allocated autoip"));
|
| mbed714 |
0:d616ece2d859
|
326
|
} else {
|
| mbed714 |
0:d616ece2d859
|
327
|
autoip->state = AUTOIP_STATE_OFF;
|
| mbed714 |
0:d616ece2d859
|
328
|
autoip->ttw = 0;
|
| mbed714 |
0:d616ece2d859
|
329
|
autoip->sent_num = 0;
|
| mbed714 |
0:d616ece2d859
|
330
|
ip_addr_set_zero(&autoip->llipaddr);
|
| mbed714 |
0:d616ece2d859
|
331
|
autoip->lastconflict = 0;
|
| mbed714 |
0:d616ece2d859
|
332
|
}
|
| mbed714 |
0:d616ece2d859
|
333
|
|
| mbed714 |
0:d616ece2d859
|
334
|
autoip_create_addr(netif, &(autoip->llipaddr));
|
| mbed714 |
0:d616ece2d859
|
335
|
autoip_start_probing(netif);
|
| mbed714 |
0:d616ece2d859
|
336
|
|
| mbed714 |
0:d616ece2d859
|
337
|
return result;
|
| mbed714 |
0:d616ece2d859
|
338
|
}
|
| mbed714 |
0:d616ece2d859
|
339
|
|
| mbed714 |
0:d616ece2d859
|
340
|
static void
|
| mbed714 |
0:d616ece2d859
|
341
|
autoip_start_probing(struct netif *netif)
|
| mbed714 |
0:d616ece2d859
|
342
|
{
|
| mbed714 |
0:d616ece2d859
|
343
|
struct autoip *autoip = netif->autoip;
|
| mbed714 |
0:d616ece2d859
|
344
|
|
| mbed714 |
0:d616ece2d859
|
345
|
autoip->state = AUTOIP_STATE_PROBING;
|
| mbed714 |
0:d616ece2d859
|
346
|
autoip->sent_num = 0;
|
| mbed714 |
0:d616ece2d859
|
347
|
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
|
| mbed714 |
0:d616ece2d859
|
348
|
("autoip_start_probing(): changing state to PROBING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
|
| mbed714 |
0:d616ece2d859
|
349
|
ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
|
| mbed714 |
0:d616ece2d859
|
350
|
ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
|
| mbed714 |
0:d616ece2d859
|
351
|
|
| mbed714 |
0:d616ece2d859
|
352
|
/* time to wait to first probe, this is randomly
|
| mbed714 |
0:d616ece2d859
|
353
|
* choosen out of 0 to PROBE_WAIT seconds.
|
| mbed714 |
0:d616ece2d859
|
354
|
* compliant to RFC 3927 Section 2.2.1
|
| mbed714 |
0:d616ece2d859
|
355
|
*/
|
| mbed714 |
0:d616ece2d859
|
356
|
autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND));
|
| mbed714 |
0:d616ece2d859
|
357
|
|
| mbed714 |
0:d616ece2d859
|
358
|
/*
|
| mbed714 |
0:d616ece2d859
|
359
|
* if we tried more then MAX_CONFLICTS we must limit our rate for
|
| mbed714 |
0:d616ece2d859
|
360
|
* accquiring and probing address
|
| mbed714 |
0:d616ece2d859
|
361
|
* compliant to RFC 3927 Section 2.2.1
|
| mbed714 |
0:d616ece2d859
|
362
|
*/
|
| mbed714 |
0:d616ece2d859
|
363
|
if(autoip->tried_llipaddr > MAX_CONFLICTS) {
|
| mbed714 |
0:d616ece2d859
|
364
|
autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND;
|
| mbed714 |
0:d616ece2d859
|
365
|
}
|
| mbed714 |
0:d616ece2d859
|
366
|
}
|
| mbed714 |
0:d616ece2d859
|
367
|
|
| mbed714 |
0:d616ece2d859
|
368
|
/**
|
| mbed714 |
0:d616ece2d859
|
369
|
* Handle a possible change in the network configuration.
|
| mbed714 |
0:d616ece2d859
|
370
|
*
|
| mbed714 |
0:d616ece2d859
|
371
|
* If there is an AutoIP address configured, take the interface down
|
| mbed714 |
0:d616ece2d859
|
372
|
* and begin probing with the same address.
|
| mbed714 |
0:d616ece2d859
|
373
|
*/
|
| mbed714 |
0:d616ece2d859
|
374
|
void
|
| mbed714 |
0:d616ece2d859
|
375
|
autoip_network_changed(struct netif *netif)
|
| mbed714 |
0:d616ece2d859
|
376
|
{
|
| mbed714 |
0:d616ece2d859
|
377
|
if (netif->autoip && netif->autoip->state != AUTOIP_STATE_OFF) {
|
| mbed714 |
0:d616ece2d859
|
378
|
netif_set_down(netif);
|
| mbed714 |
0:d616ece2d859
|
379
|
autoip_start_probing(netif);
|
| mbed714 |
0:d616ece2d859
|
380
|
}
|
| mbed714 |
0:d616ece2d859
|
381
|
}
|
| mbed714 |
0:d616ece2d859
|
382
|
|
| mbed714 |
0:d616ece2d859
|
383
|
/**
|
| mbed714 |
0:d616ece2d859
|
384
|
* Stop AutoIP client
|
| mbed714 |
0:d616ece2d859
|
385
|
*
|
| mbed714 |
0:d616ece2d859
|
386
|
* @param netif network interface on which stop the AutoIP client
|
| mbed714 |
0:d616ece2d859
|
387
|
*/
|
| mbed714 |
0:d616ece2d859
|
388
|
err_t
|
| mbed714 |
0:d616ece2d859
|
389
|
autoip_stop(struct netif *netif)
|
| mbed714 |
0:d616ece2d859
|
390
|
{
|
| mbed714 |
0:d616ece2d859
|
391
|
netif->autoip->state = AUTOIP_STATE_OFF;
|
| mbed714 |
0:d616ece2d859
|
392
|
netif_set_down(netif);
|
| mbed714 |
0:d616ece2d859
|
393
|
return ERR_OK;
|
| mbed714 |
0:d616ece2d859
|
394
|
}
|
| mbed714 |
0:d616ece2d859
|
395
|
|
| mbed714 |
0:d616ece2d859
|
396
|
/**
|
| mbed714 |
0:d616ece2d859
|
397
|
* Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds
|
| mbed714 |
0:d616ece2d859
|
398
|
*/
|
| mbed714 |
0:d616ece2d859
|
399
|
void
|
| mbed714 |
0:d616ece2d859
|
400
|
autoip_tmr()
|
| mbed714 |
0:d616ece2d859
|
401
|
{
|
| mbed714 |
0:d616ece2d859
|
402
|
struct netif *netif = netif_list;
|
| mbed714 |
0:d616ece2d859
|
403
|
/* loop through netif's */
|
| mbed714 |
0:d616ece2d859
|
404
|
while (netif != NULL) {
|
| mbed714 |
0:d616ece2d859
|
405
|
/* only act on AutoIP configured interfaces */
|
| mbed714 |
0:d616ece2d859
|
406
|
if (netif->autoip != NULL) {
|
| mbed714 |
0:d616ece2d859
|
407
|
if(netif->autoip->lastconflict > 0) {
|
| mbed714 |
0:d616ece2d859
|
408
|
netif->autoip->lastconflict--;
|
| mbed714 |
0:d616ece2d859
|
409
|
}
|
| mbed714 |
0:d616ece2d859
|
410
|
|
| mbed714 |
0:d616ece2d859
|
411
|
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
|
| mbed714 |
0:d616ece2d859
|
412
|
("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n",
|
| mbed714 |
0:d616ece2d859
|
413
|
(u16_t)(netif->autoip->state), netif->autoip->ttw));
|
| mbed714 |
0:d616ece2d859
|
414
|
|
| mbed714 |
0:d616ece2d859
|
415
|
switch(netif->autoip->state) {
|
| mbed714 |
0:d616ece2d859
|
416
|
case AUTOIP_STATE_PROBING:
|
| mbed714 |
0:d616ece2d859
|
417
|
if(netif->autoip->ttw > 0) {
|
| mbed714 |
0:d616ece2d859
|
418
|
netif->autoip->ttw--;
|
| mbed714 |
0:d616ece2d859
|
419
|
} else {
|
| mbed714 |
0:d616ece2d859
|
420
|
if(netif->autoip->sent_num >= PROBE_NUM) {
|
| mbed714 |
0:d616ece2d859
|
421
|
netif->autoip->state = AUTOIP_STATE_ANNOUNCING;
|
| mbed714 |
0:d616ece2d859
|
422
|
netif->autoip->sent_num = 0;
|
| mbed714 |
0:d616ece2d859
|
423
|
netif->autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND;
|
| mbed714 |
0:d616ece2d859
|
424
|
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
|
| mbed714 |
0:d616ece2d859
|
425
|
("autoip_tmr(): changing state to ANNOUNCING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
|
| mbed714 |
0:d616ece2d859
|
426
|
ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
|
| mbed714 |
0:d616ece2d859
|
427
|
ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
|
| mbed714 |
0:d616ece2d859
|
428
|
} else {
|
| mbed714 |
0:d616ece2d859
|
429
|
autoip_arp_probe(netif);
|
| mbed714 |
0:d616ece2d859
|
430
|
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
|
| mbed714 |
0:d616ece2d859
|
431
|
("autoip_tmr() PROBING Sent Probe\n"));
|
| mbed714 |
0:d616ece2d859
|
432
|
netif->autoip->sent_num++;
|
| mbed714 |
0:d616ece2d859
|
433
|
/* calculate time to wait to next probe */
|
| mbed714 |
0:d616ece2d859
|
434
|
netif->autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) %
|
| mbed714 |
0:d616ece2d859
|
435
|
((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) +
|
| mbed714 |
0:d616ece2d859
|
436
|
PROBE_MIN * AUTOIP_TICKS_PER_SECOND);
|
| mbed714 |
0:d616ece2d859
|
437
|
}
|
| mbed714 |
0:d616ece2d859
|
438
|
}
|
| mbed714 |
0:d616ece2d859
|
439
|
break;
|
| mbed714 |
0:d616ece2d859
|
440
|
|
| mbed714 |
0:d616ece2d859
|
441
|
case AUTOIP_STATE_ANNOUNCING:
|
| mbed714 |
0:d616ece2d859
|
442
|
if(netif->autoip->ttw > 0) {
|
| mbed714 |
0:d616ece2d859
|
443
|
netif->autoip->ttw--;
|
| mbed714 |
0:d616ece2d859
|
444
|
} else {
|
| mbed714 |
0:d616ece2d859
|
445
|
if(netif->autoip->sent_num == 0) {
|
| mbed714 |
0:d616ece2d859
|
446
|
/* We are here the first time, so we waited ANNOUNCE_WAIT seconds
|
| mbed714 |
0:d616ece2d859
|
447
|
* Now we can bind to an IP address and use it.
|
| mbed714 |
0:d616ece2d859
|
448
|
*
|
| mbed714 |
0:d616ece2d859
|
449
|
* autoip_bind calls netif_set_up. This triggers a gratuitous ARP
|
| mbed714 |
0:d616ece2d859
|
450
|
* which counts as an announcement.
|
| mbed714 |
0:d616ece2d859
|
451
|
*/
|
| mbed714 |
0:d616ece2d859
|
452
|
autoip_bind(netif);
|
| mbed714 |
0:d616ece2d859
|
453
|
} else {
|
| mbed714 |
0:d616ece2d859
|
454
|
autoip_arp_announce(netif);
|
| mbed714 |
0:d616ece2d859
|
455
|
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
|
| mbed714 |
0:d616ece2d859
|
456
|
("autoip_tmr() ANNOUNCING Sent Announce\n"));
|
| mbed714 |
0:d616ece2d859
|
457
|
}
|
| mbed714 |
0:d616ece2d859
|
458
|
netif->autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND;
|
| mbed714 |
0:d616ece2d859
|
459
|
netif->autoip->sent_num++;
|
| mbed714 |
0:d616ece2d859
|
460
|
|
| mbed714 |
0:d616ece2d859
|
461
|
if(netif->autoip->sent_num >= ANNOUNCE_NUM) {
|
| mbed714 |
0:d616ece2d859
|
462
|
netif->autoip->state = AUTOIP_STATE_BOUND;
|
| mbed714 |
0:d616ece2d859
|
463
|
netif->autoip->sent_num = 0;
|
| mbed714 |
0:d616ece2d859
|
464
|
netif->autoip->ttw = 0;
|
| mbed714 |
0:d616ece2d859
|
465
|
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
|
| mbed714 |
0:d616ece2d859
|
466
|
("autoip_tmr(): changing state to BOUND: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
|
| mbed714 |
0:d616ece2d859
|
467
|
ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
|
| mbed714 |
0:d616ece2d859
|
468
|
ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
|
| mbed714 |
0:d616ece2d859
|
469
|
}
|
| mbed714 |
0:d616ece2d859
|
470
|
}
|
| mbed714 |
0:d616ece2d859
|
471
|
break;
|
| mbed714 |
0:d616ece2d859
|
472
|
}
|
| mbed714 |
0:d616ece2d859
|
473
|
}
|
| mbed714 |
0:d616ece2d859
|
474
|
/* proceed to next network interface */
|
| mbed714 |
0:d616ece2d859
|
475
|
netif = netif->next;
|
| mbed714 |
0:d616ece2d859
|
476
|
}
|
| mbed714 |
0:d616ece2d859
|
477
|
}
|
| mbed714 |
0:d616ece2d859
|
478
|
|
| mbed714 |
0:d616ece2d859
|
479
|
/**
|
| mbed714 |
0:d616ece2d859
|
480
|
* Handles every incoming ARP Packet, called by etharp_arp_input.
|
| mbed714 |
0:d616ece2d859
|
481
|
*
|
| mbed714 |
0:d616ece2d859
|
482
|
* @param netif network interface to use for autoip processing
|
| mbed714 |
0:d616ece2d859
|
483
|
* @param hdr Incoming ARP packet
|
| mbed714 |
0:d616ece2d859
|
484
|
*/
|
| mbed714 |
0:d616ece2d859
|
485
|
void
|
| mbed714 |
0:d616ece2d859
|
486
|
autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr)
|
| mbed714 |
0:d616ece2d859
|
487
|
{
|
| mbed714 |
0:d616ece2d859
|
488
|
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_arp_reply()\n"));
|
| mbed714 |
0:d616ece2d859
|
489
|
if ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) {
|
| mbed714 |
0:d616ece2d859
|
490
|
/* when ip.src == llipaddr && hw.src != netif->hwaddr
|
| mbed714 |
0:d616ece2d859
|
491
|
*
|
| mbed714 |
0:d616ece2d859
|
492
|
* when probing ip.dst == llipaddr && hw.src != netif->hwaddr
|
| mbed714 |
0:d616ece2d859
|
493
|
* we have a conflict and must solve it
|
| mbed714 |
0:d616ece2d859
|
494
|
*/
|
| mbed714 |
0:d616ece2d859
|
495
|
ip_addr_t sipaddr, dipaddr;
|
| mbed714 |
0:d616ece2d859
|
496
|
struct eth_addr netifaddr;
|
| mbed714 |
0:d616ece2d859
|
497
|
netifaddr.addr[0] = netif->hwaddr[0];
|
| mbed714 |
0:d616ece2d859
|
498
|
netifaddr.addr[1] = netif->hwaddr[1];
|
| mbed714 |
0:d616ece2d859
|
499
|
netifaddr.addr[2] = netif->hwaddr[2];
|
| mbed714 |
0:d616ece2d859
|
500
|
netifaddr.addr[3] = netif->hwaddr[3];
|
| mbed714 |
0:d616ece2d859
|
501
|
netifaddr.addr[4] = netif->hwaddr[4];
|
| mbed714 |
0:d616ece2d859
|
502
|
netifaddr.addr[5] = netif->hwaddr[5];
|
| mbed714 |
0:d616ece2d859
|
503
|
|
| mbed714 |
0:d616ece2d859
|
504
|
/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
|
| mbed714 |
0:d616ece2d859
|
505
|
* structure packing (not using structure copy which breaks strict-aliasing rules).
|
| mbed714 |
0:d616ece2d859
|
506
|
*/
|
| mbed714 |
0:d616ece2d859
|
507
|
IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
|
| mbed714 |
0:d616ece2d859
|
508
|
IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
|
| mbed714 |
0:d616ece2d859
|
509
|
|
| mbed714 |
0:d616ece2d859
|
510
|
if ((netif->autoip->state == AUTOIP_STATE_PROBING) ||
|
| mbed714 |
0:d616ece2d859
|
511
|
((netif->autoip->state == AUTOIP_STATE_ANNOUNCING) &&
|
| mbed714 |
0:d616ece2d859
|
512
|
(netif->autoip->sent_num == 0))) {
|
| mbed714 |
0:d616ece2d859
|
513
|
/* RFC 3927 Section 2.2.1:
|
| mbed714 |
0:d616ece2d859
|
514
|
* from beginning to after ANNOUNCE_WAIT
|
| mbed714 |
0:d616ece2d859
|
515
|
* seconds we have a conflict if
|
| mbed714 |
0:d616ece2d859
|
516
|
* ip.src == llipaddr OR
|
| mbed714 |
0:d616ece2d859
|
517
|
* ip.dst == llipaddr && hw.src != own hwaddr
|
| mbed714 |
0:d616ece2d859
|
518
|
*/
|
| mbed714 |
0:d616ece2d859
|
519
|
if ((ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr)) ||
|
| mbed714 |
0:d616ece2d859
|
520
|
(ip_addr_cmp(&dipaddr, &netif->autoip->llipaddr) &&
|
| mbed714 |
0:d616ece2d859
|
521
|
!eth_addr_cmp(&netifaddr, &hdr->shwaddr))) {
|
| mbed714 |
0:d616ece2d859
|
522
|
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
|
| mbed714 |
0:d616ece2d859
|
523
|
("autoip_arp_reply(): Probe Conflict detected\n"));
|
| mbed714 |
0:d616ece2d859
|
524
|
autoip_restart(netif);
|
| mbed714 |
0:d616ece2d859
|
525
|
}
|
| mbed714 |
0:d616ece2d859
|
526
|
} else {
|
| mbed714 |
0:d616ece2d859
|
527
|
/* RFC 3927 Section 2.5:
|
| mbed714 |
0:d616ece2d859
|
528
|
* in any state we have a conflict if
|
| mbed714 |
0:d616ece2d859
|
529
|
* ip.src == llipaddr && hw.src != own hwaddr
|
| mbed714 |
0:d616ece2d859
|
530
|
*/
|
| mbed714 |
0:d616ece2d859
|
531
|
if (ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr) &&
|
| mbed714 |
0:d616ece2d859
|
532
|
!eth_addr_cmp(&netifaddr, &hdr->shwaddr)) {
|
| mbed714 |
0:d616ece2d859
|
533
|
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
|
| mbed714 |
0:d616ece2d859
|
534
|
("autoip_arp_reply(): Conflicting ARP-Packet detected\n"));
|
| mbed714 |
0:d616ece2d859
|
535
|
autoip_handle_arp_conflict(netif);
|
| mbed714 |
0:d616ece2d859
|
536
|
}
|
| mbed714 |
0:d616ece2d859
|
537
|
}
|
| mbed714 |
0:d616ece2d859
|
538
|
}
|
| mbed714 |
0:d616ece2d859
|
539
|
}
|
| mbed714 |
0:d616ece2d859
|
540
|
|
| mbed714 |
0:d616ece2d859
|
541
|
#endif /* LWIP_AUTOIP */
|
Daniel Peter