Bonjour - First step: AutoIP compiled in and working

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Darran Shepherd / Mbed 2 deprecated Bonjour

First step: AutoIP compiled in and working

lwip/core/ipv4/autoip.c@1:4218cacaf696, 2010-06-18 (annotated)

Committer:: darran
Date:: Fri Jun 18 15:54:21 2010 +0000
Revision:: 1:4218cacaf696
Parent:: 0:55a05330f8cc

Who changed what in which revision?

User	Revision	Line number	New contents of line
darran	0:55a05330f8cc	1	/**
darran	0:55a05330f8cc	2	* @file
darran	0:55a05330f8cc	3	* AutoIP Automatic LinkLocal IP Configuration
darran	0:55a05330f8cc	4	*
darran	0:55a05330f8cc	5	*/
darran	0:55a05330f8cc	6
darran	0:55a05330f8cc	7	/*
darran	0:55a05330f8cc	8	*
darran	0:55a05330f8cc	9	* Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
darran	0:55a05330f8cc	10	* All rights reserved.
darran	0:55a05330f8cc	11	*
darran	0:55a05330f8cc	12	* Redistribution and use in source and binary forms, with or without modification,
darran	0:55a05330f8cc	13	* are permitted provided that the following conditions are met:
darran	0:55a05330f8cc	14	*
darran	0:55a05330f8cc	15	* 1. Redistributions of source code must retain the above copyright notice,
darran	0:55a05330f8cc	16	* this list of conditions and the following disclaimer.
darran	0:55a05330f8cc	17	* 2. Redistributions in binary form must reproduce the above copyright notice,
darran	0:55a05330f8cc	18	* this list of conditions and the following disclaimer in the documentation
darran	0:55a05330f8cc	19	* and/or other materials provided with the distribution.
darran	0:55a05330f8cc	20	* 3. The name of the author may not be used to endorse or promote products
darran	0:55a05330f8cc	21	* derived from this software without specific prior written permission.
darran	0:55a05330f8cc	22	*
darran	0:55a05330f8cc	23	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
darran	0:55a05330f8cc	24	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
darran	0:55a05330f8cc	25	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
darran	0:55a05330f8cc	26	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
darran	0:55a05330f8cc	27	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
darran	0:55a05330f8cc	28	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
darran	0:55a05330f8cc	29	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
darran	0:55a05330f8cc	30	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
darran	0:55a05330f8cc	31	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
darran	0:55a05330f8cc	32	* OF SUCH DAMAGE.
darran	0:55a05330f8cc	33	*
darran	0:55a05330f8cc	34	* Author: Dominik Spies <kontakt@dspies.de>
darran	0:55a05330f8cc	35	*
darran	0:55a05330f8cc	36	* This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
darran	0:55a05330f8cc	37	* with RFC 3927.
darran	0:55a05330f8cc	38	*
darran	0:55a05330f8cc	39	*
darran	0:55a05330f8cc	40	* Please coordinate changes and requests with Dominik Spies
darran	0:55a05330f8cc	41	* <kontakt@dspies.de>
darran	0:55a05330f8cc	42	*/
darran	0:55a05330f8cc	43
darran	0:55a05330f8cc	44	/*******************************************************************************
darran	0:55a05330f8cc	45	* USAGE:
darran	0:55a05330f8cc	46	*
darran	0:55a05330f8cc	47	* define LWIP_AUTOIP 1 in your lwipopts.h
darran	0:55a05330f8cc	48	*
darran	0:55a05330f8cc	49	* If you don't use tcpip.c (so, don't call, you don't call tcpip_init):
darran	0:55a05330f8cc	50	* - First, call autoip_init().
darran	0:55a05330f8cc	51	* - call autoip_tmr() all AUTOIP_TMR_INTERVAL msces,
darran	0:55a05330f8cc	52	* that should be defined in autoip.h.
darran	0:55a05330f8cc	53	* I recommend a value of 100. The value must divide 1000 with a remainder almost 0.
darran	0:55a05330f8cc	54	* Possible values are 1000, 500, 333, 250, 200, 166, 142, 125, 111, 100 ....
darran	0:55a05330f8cc	55	*
darran	0:55a05330f8cc	56	* Without DHCP:
darran	0:55a05330f8cc	57	* - Call autoip_start() after netif_add().
darran	0:55a05330f8cc	58	*
darran	0:55a05330f8cc	59	* With DHCP:
darran	0:55a05330f8cc	60	* - define LWIP_DHCP_AUTOIP_COOP 1 in your lwipopts.h.
darran	0:55a05330f8cc	61	* - Configure your DHCP Client.
darran	0:55a05330f8cc	62	*
darran	0:55a05330f8cc	63	*/
darran	0:55a05330f8cc	64
darran	0:55a05330f8cc	65	#include "lwip/opt.h"
darran	0:55a05330f8cc	66
darran	0:55a05330f8cc	67	#if LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */
darran	0:55a05330f8cc	68
darran	0:55a05330f8cc	69	#include "lwip/mem.h"
darran	0:55a05330f8cc	70	#include "lwip/udp.h"
darran	0:55a05330f8cc	71	#include "lwip/ip_addr.h"
darran	0:55a05330f8cc	72	#include "lwip/netif.h"
darran	0:55a05330f8cc	73	#include "lwip/autoip.h"
darran	0:55a05330f8cc	74	#include "netif/etharp.h"
darran	0:55a05330f8cc	75
darran	0:55a05330f8cc	76	#include <stdlib.h>
darran	0:55a05330f8cc	77	#include <string.h>
darran	0:55a05330f8cc	78
darran	0:55a05330f8cc	79	/* 169.254.0.0 */
darran	0:55a05330f8cc	80	#define AUTOIP_NET 0xA9FE0000
darran	0:55a05330f8cc	81	/* 169.254.1.0 */
darran	0:55a05330f8cc	82	#define AUTOIP_RANGE_START (AUTOIP_NET \| 0x0100)
darran	0:55a05330f8cc	83	/* 169.254.254.255 */
darran	0:55a05330f8cc	84	#define AUTOIP_RANGE_END (AUTOIP_NET \| 0xFEFF)
darran	0:55a05330f8cc	85
darran	0:55a05330f8cc	86
darran	0:55a05330f8cc	87	/** Pseudo random macro based on netif informations.
darran	0:55a05330f8cc	88	* You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */
darran	0:55a05330f8cc	89	#ifndef LWIP_AUTOIP_RAND
darran	0:55a05330f8cc	90	#define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) \| \
darran	0:55a05330f8cc	91	((u32_t)((netif->hwaddr[3]) & 0xff) << 16) \| \
darran	0:55a05330f8cc	92	((u32_t)((netif->hwaddr[2]) & 0xff) << 8) \| \
darran	0:55a05330f8cc	93	((u32_t)((netif->hwaddr[4]) & 0xff))) + \
darran	0:55a05330f8cc	94	(netif->autoip?netif->autoip->tried_llipaddr:0))
darran	0:55a05330f8cc	95	#endif /* LWIP_AUTOIP_RAND */
darran	0:55a05330f8cc	96
darran	0:55a05330f8cc	97	/**
darran	0:55a05330f8cc	98	* Macro that generates the initial IP address to be tried by AUTOIP.
darran	0:55a05330f8cc	99	* If you want to override this, define it to something else in lwipopts.h.
darran	0:55a05330f8cc	100	*/
darran	0:55a05330f8cc	101	#ifndef LWIP_AUTOIP_CREATE_SEED_ADDR
darran	0:55a05330f8cc	102	#define LWIP_AUTOIP_CREATE_SEED_ADDR(netif) \
darran	0:55a05330f8cc	103	htonl(AUTOIP_RANGE_START + ((u32_t)(((u8_t)(netif->hwaddr[4])) \| \
darran	0:55a05330f8cc	104	((u32_t)((u8_t)(netif->hwaddr[5]))) << 8)))
darran	0:55a05330f8cc	105	#endif /* LWIP_AUTOIP_CREATE_SEED_ADDR */
darran	0:55a05330f8cc	106
darran	0:55a05330f8cc	107	/* static functions */
darran	0:55a05330f8cc	108	static void autoip_handle_arp_conflict(struct netif *netif);
darran	0:55a05330f8cc	109
darran	0:55a05330f8cc	110	/* creates a pseudo random LL IP-Address for a network interface */
darran	0:55a05330f8cc	111	static void autoip_create_addr(struct netif netif, ip_addr_t ipaddr);
darran	0:55a05330f8cc	112
darran	0:55a05330f8cc	113	/* sends an ARP probe */
darran	0:55a05330f8cc	114	static err_t autoip_arp_probe(struct netif *netif);
darran	0:55a05330f8cc	115
darran	0:55a05330f8cc	116	/* sends an ARP announce */
darran	0:55a05330f8cc	117	static err_t autoip_arp_announce(struct netif *netif);
darran	0:55a05330f8cc	118
darran	0:55a05330f8cc	119	/* configure interface for use with current LL IP-Address */
darran	0:55a05330f8cc	120	static err_t autoip_bind(struct netif *netif);
darran	0:55a05330f8cc	121
darran	0:55a05330f8cc	122	/* start sending probes for llipaddr */
darran	0:55a05330f8cc	123	static void autoip_start_probing(struct netif *netif);
darran	0:55a05330f8cc	124
darran	0:55a05330f8cc	125	/**
darran	0:55a05330f8cc	126	* Initialize this module
darran	0:55a05330f8cc	127	*/
darran	0:55a05330f8cc	128	void
darran	0:55a05330f8cc	129	autoip_init(void)
darran	0:55a05330f8cc	130	{
darran	0:55a05330f8cc	131	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE, ("autoip_init()\n"));
darran	0:55a05330f8cc	132	}
darran	0:55a05330f8cc	133
darran	0:55a05330f8cc	134	/** Set a statically allocated struct autoip to work with.
darran	0:55a05330f8cc	135	* Using this prevents autoip_start to allocate it using mem_malloc.
darran	0:55a05330f8cc	136	*
darran	0:55a05330f8cc	137	* @param netif the netif for which to set the struct autoip
darran	0:55a05330f8cc	138	* @param dhcp (uninitialised) dhcp struct allocated by the application
darran	0:55a05330f8cc	139	*/
darran	0:55a05330f8cc	140	void
darran	0:55a05330f8cc	141	autoip_set_struct(struct netif netif, struct autoip autoip)
darran	0:55a05330f8cc	142	{
darran	0:55a05330f8cc	143	LWIP_ASSERT("netif != NULL", netif != NULL);
darran	0:55a05330f8cc	144	LWIP_ASSERT("autoip != NULL", autoip != NULL);
darran	0:55a05330f8cc	145	LWIP_ASSERT("netif already has a struct autoip set", netif->autoip == NULL);
darran	0:55a05330f8cc	146
darran	0:55a05330f8cc	147	/* clear data structure */
darran	0:55a05330f8cc	148	memset(autoip, 0, sizeof(struct autoip));
darran	0:55a05330f8cc	149	/* autoip->state = AUTOIP_STATE_OFF; */
darran	0:55a05330f8cc	150	netif->autoip = autoip;
darran	0:55a05330f8cc	151	}
darran	0:55a05330f8cc	152
darran	0:55a05330f8cc	153	/**
darran	0:55a05330f8cc	154	* Handle a IP address conflict after an ARP conflict detection
darran	0:55a05330f8cc	155	*/
darran	0:55a05330f8cc	156	static void
darran	0:55a05330f8cc	157	autoip_handle_arp_conflict(struct netif *netif)
darran	0:55a05330f8cc	158	{
darran	0:55a05330f8cc	159	/* Somehow detect if we are defending or retreating */
darran	0:55a05330f8cc	160	unsigned char defend = 1; /* tbd */
darran	0:55a05330f8cc	161
darran	0:55a05330f8cc	162	if(defend) {
darran	0:55a05330f8cc	163	if(netif->autoip->lastconflict > 0) {
darran	0:55a05330f8cc	164	/* retreat, there was a conflicting ARP in the last
darran	0:55a05330f8cc	165	* DEFEND_INTERVAL seconds
darran	0:55a05330f8cc	166	*/
darran	0:55a05330f8cc	167	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
darran	0:55a05330f8cc	168	("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n"));
darran	0:55a05330f8cc	169
darran	0:55a05330f8cc	170	/* TODO: close all TCP sessions */
darran	0:55a05330f8cc	171	autoip_start(netif);
darran	0:55a05330f8cc	172	} else {
darran	0:55a05330f8cc	173	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
darran	0:55a05330f8cc	174	("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n"));
darran	0:55a05330f8cc	175	autoip_arp_announce(netif);
darran	0:55a05330f8cc	176	netif->autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_TICKS_PER_SECOND;
darran	0:55a05330f8cc	177	}
darran	0:55a05330f8cc	178	} else {
darran	0:55a05330f8cc	179	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
darran	0:55a05330f8cc	180	("autoip_handle_arp_conflict(): we do not defend, retreating\n"));
darran	0:55a05330f8cc	181	/* TODO: close all TCP sessions */
darran	0:55a05330f8cc	182	autoip_start(netif);
darran	0:55a05330f8cc	183	}
darran	0:55a05330f8cc	184	}
darran	0:55a05330f8cc	185
darran	0:55a05330f8cc	186	/**
darran	0:55a05330f8cc	187	* Create an IP-Address out of range 169.254.1.0 to 169.254.254.255
darran	0:55a05330f8cc	188	*
darran	0:55a05330f8cc	189	* @param netif network interface on which create the IP-Address
darran	0:55a05330f8cc	190	* @param ipaddr ip address to initialize
darran	0:55a05330f8cc	191	*/
darran	0:55a05330f8cc	192	static void
darran	0:55a05330f8cc	193	autoip_create_addr(struct netif netif, ip_addr_t ipaddr)
darran	0:55a05330f8cc	194	{
darran	0:55a05330f8cc	195	/* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255
darran	0:55a05330f8cc	196	* compliant to RFC 3927 Section 2.1
darran	0:55a05330f8cc	197	* We have 254 * 256 possibilities */
darran	0:55a05330f8cc	198
darran	0:55a05330f8cc	199	u32_t addr = ntohl(LWIP_AUTOIP_CREATE_SEED_ADDR(netif));
darran	0:55a05330f8cc	200	addr += netif->autoip->tried_llipaddr;
darran	0:55a05330f8cc	201	addr = AUTOIP_NET \| (addr & 0xffff);
darran	0:55a05330f8cc	202	/* Now, 169.254.0.0 <= addr <= 169.254.255.255 */
darran	0:55a05330f8cc	203
darran	0:55a05330f8cc	204	if (addr < AUTOIP_RANGE_START) {
darran	0:55a05330f8cc	205	addr += AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
darran	0:55a05330f8cc	206	}
darran	0:55a05330f8cc	207	if (addr > AUTOIP_RANGE_END) {
darran	0:55a05330f8cc	208	addr -= AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
darran	0:55a05330f8cc	209	}
darran	0:55a05330f8cc	210	LWIP_ASSERT("AUTOIP address not in range", (addr >= AUTOIP_RANGE_START) &&
darran	0:55a05330f8cc	211	(addr <= AUTOIP_RANGE_END));
darran	0:55a05330f8cc	212	ip4_addr_set_u32(ipaddr, htonl(addr));
darran	0:55a05330f8cc	213
darran	0:55a05330f8cc	214	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
darran	0:55a05330f8cc	215	("autoip_create_addr(): tried_llipaddr=%"U16_F", %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
darran	0:55a05330f8cc	216	(u16_t)(netif->autoip->tried_llipaddr), ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr),
darran	0:55a05330f8cc	217	ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
darran	0:55a05330f8cc	218	}
darran	0:55a05330f8cc	219
darran	0:55a05330f8cc	220	/**
darran	0:55a05330f8cc	221	* Sends an ARP probe from a network interface
darran	0:55a05330f8cc	222	*
darran	0:55a05330f8cc	223	* @param netif network interface used to send the probe
darran	0:55a05330f8cc	224	*/
darran	0:55a05330f8cc	225	static err_t
darran	0:55a05330f8cc	226	autoip_arp_probe(struct netif *netif)
darran	0:55a05330f8cc	227	{
darran	0:55a05330f8cc	228	return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
darran	0:55a05330f8cc	229	(struct eth_addr *)netif->hwaddr, IP_ADDR_ANY, &ethzero,
darran	0:55a05330f8cc	230	&netif->autoip->llipaddr, ARP_REQUEST);
darran	0:55a05330f8cc	231	}
darran	0:55a05330f8cc	232
darran	0:55a05330f8cc	233	/**
darran	0:55a05330f8cc	234	* Sends an ARP announce from a network interface
darran	0:55a05330f8cc	235	*
darran	0:55a05330f8cc	236	* @param netif network interface used to send the announce
darran	0:55a05330f8cc	237	*/
darran	0:55a05330f8cc	238	static err_t
darran	0:55a05330f8cc	239	autoip_arp_announce(struct netif *netif)
darran	0:55a05330f8cc	240	{
darran	0:55a05330f8cc	241	return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
darran	0:55a05330f8cc	242	(struct eth_addr *)netif->hwaddr, &netif->autoip->llipaddr, &ethzero,
darran	0:55a05330f8cc	243	&netif->autoip->llipaddr, ARP_REQUEST);
darran	0:55a05330f8cc	244	}
darran	0:55a05330f8cc	245
darran	0:55a05330f8cc	246	/**
darran	0:55a05330f8cc	247	* Configure interface for use with current LL IP-Address
darran	0:55a05330f8cc	248	*
darran	0:55a05330f8cc	249	* @param netif network interface to configure with current LL IP-Address
darran	0:55a05330f8cc	250	*/
darran	0:55a05330f8cc	251	static err_t
darran	0:55a05330f8cc	252	autoip_bind(struct netif *netif)
darran	0:55a05330f8cc	253	{
darran	0:55a05330f8cc	254	struct autoip *autoip = netif->autoip;
darran	0:55a05330f8cc	255	ip_addr_t sn_mask, gw_addr;
darran	0:55a05330f8cc	256
darran	0:55a05330f8cc	257	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
darran	0:55a05330f8cc	258	("autoip_bind(netif=%p) %c%c%"U16_F" %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
darran	0:55a05330f8cc	259	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num,
darran	0:55a05330f8cc	260	ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr),
darran	0:55a05330f8cc	261	ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr)));
darran	0:55a05330f8cc	262
darran	0:55a05330f8cc	263	IP4_ADDR(&sn_mask, 255, 255, 0, 0);
darran	0:55a05330f8cc	264	IP4_ADDR(&gw_addr, 0, 0, 0, 0);
darran	0:55a05330f8cc	265
darran	0:55a05330f8cc	266	netif_set_ipaddr(netif, &autoip->llipaddr);
darran	0:55a05330f8cc	267	netif_set_netmask(netif, &sn_mask);
darran	0:55a05330f8cc	268	netif_set_gw(netif, &gw_addr);
darran	0:55a05330f8cc	269
darran	0:55a05330f8cc	270	/* bring the interface up */
darran	0:55a05330f8cc	271	netif_set_up(netif);
darran	0:55a05330f8cc	272
darran	0:55a05330f8cc	273	return ERR_OK;
darran	0:55a05330f8cc	274	}
darran	0:55a05330f8cc	275
darran	0:55a05330f8cc	276	/**
darran	0:55a05330f8cc	277	* Start AutoIP client
darran	0:55a05330f8cc	278	*
darran	0:55a05330f8cc	279	* @param netif network interface on which start the AutoIP client
darran	0:55a05330f8cc	280	*/
darran	0:55a05330f8cc	281	err_t
darran	0:55a05330f8cc	282	autoip_start(struct netif *netif)
darran	0:55a05330f8cc	283	{
darran	0:55a05330f8cc	284	struct autoip *autoip = netif->autoip;
darran	0:55a05330f8cc	285	err_t result = ERR_OK;
darran	0:55a05330f8cc	286
darran	0:55a05330f8cc	287	if(netif_is_up(netif)) {
darran	0:55a05330f8cc	288	netif_set_down(netif);
darran	0:55a05330f8cc	289	}
darran	0:55a05330f8cc	290
darran	0:55a05330f8cc	291	/* Set IP-Address, Netmask and Gateway to 0 to make sure that
darran	0:55a05330f8cc	292	* ARP Packets are formed correctly
darran	0:55a05330f8cc	293	*/
darran	0:55a05330f8cc	294	ip_addr_set_zero(&netif->ip_addr);
darran	0:55a05330f8cc	295	ip_addr_set_zero(&netif->netmask);
darran	0:55a05330f8cc	296	ip_addr_set_zero(&netif->gw);
darran	0:55a05330f8cc	297
darran	0:55a05330f8cc	298	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
darran	0:55a05330f8cc	299	("autoip_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0],
darran	0:55a05330f8cc	300	netif->name[1], (u16_t)netif->num));
darran	0:55a05330f8cc	301	if(autoip == NULL) {
darran	0:55a05330f8cc	302	/* no AutoIP client attached yet? */
darran	0:55a05330f8cc	303	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
darran	0:55a05330f8cc	304	("autoip_start(): starting new AUTOIP client\n"));
darran	0:55a05330f8cc	305	autoip = (struct autoip *)mem_malloc(sizeof(struct autoip));
darran	0:55a05330f8cc	306	if(autoip == NULL) {
darran	0:55a05330f8cc	307	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
darran	0:55a05330f8cc	308	("autoip_start(): could not allocate autoip\n"));
darran	0:55a05330f8cc	309	return ERR_MEM;
darran	0:55a05330f8cc	310	}
darran	0:55a05330f8cc	311	memset( autoip, 0, sizeof(struct autoip));
darran	0:55a05330f8cc	312	/* store this AutoIP client in the netif */
darran	0:55a05330f8cc	313	netif->autoip = autoip;
darran	0:55a05330f8cc	314	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE, ("autoip_start(): allocated autoip"));
darran	0:55a05330f8cc	315	} else {
darran	0:55a05330f8cc	316	autoip->state = AUTOIP_STATE_OFF;
darran	0:55a05330f8cc	317	autoip->ttw = 0;
darran	0:55a05330f8cc	318	autoip->sent_num = 0;
darran	0:55a05330f8cc	319	memset(&autoip->llipaddr, 0, sizeof(ip_addr_t));
darran	0:55a05330f8cc	320	autoip->lastconflict = 0;
darran	0:55a05330f8cc	321	}
darran	0:55a05330f8cc	322
darran	0:55a05330f8cc	323	autoip_create_addr(netif, &(autoip->llipaddr));
darran	0:55a05330f8cc	324	autoip->tried_llipaddr++;
darran	0:55a05330f8cc	325	autoip_start_probing(netif);
darran	0:55a05330f8cc	326
darran	0:55a05330f8cc	327	return result;
darran	0:55a05330f8cc	328	}
darran	0:55a05330f8cc	329
darran	0:55a05330f8cc	330	static void
darran	0:55a05330f8cc	331	autoip_start_probing(struct netif *netif)
darran	0:55a05330f8cc	332	{
darran	0:55a05330f8cc	333	struct autoip *autoip = netif->autoip;
darran	0:55a05330f8cc	334
darran	0:55a05330f8cc	335	autoip->state = AUTOIP_STATE_PROBING;
darran	0:55a05330f8cc	336	autoip->sent_num = 0;
darran	0:55a05330f8cc	337	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
darran	0:55a05330f8cc	338	("autoip_start_probing(): changing state to PROBING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
darran	0:55a05330f8cc	339	ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
darran	0:55a05330f8cc	340	ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
darran	0:55a05330f8cc	341
darran	0:55a05330f8cc	342	/* time to wait to first probe, this is randomly
darran	0:55a05330f8cc	343	* choosen out of 0 to PROBE_WAIT seconds.
darran	0:55a05330f8cc	344	* compliant to RFC 3927 Section 2.2.1
darran	0:55a05330f8cc	345	*/
darran	0:55a05330f8cc	346	autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND));
darran	0:55a05330f8cc	347
darran	0:55a05330f8cc	348	/*
darran	0:55a05330f8cc	349	* if we tried more then MAX_CONFLICTS we must limit our rate for
darran	0:55a05330f8cc	350	* accquiring and probing address
darran	0:55a05330f8cc	351	* compliant to RFC 3927 Section 2.2.1
darran	0:55a05330f8cc	352	*/
darran	0:55a05330f8cc	353	if(autoip->tried_llipaddr > MAX_CONFLICTS) {
darran	0:55a05330f8cc	354	autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND;
darran	0:55a05330f8cc	355	}
darran	0:55a05330f8cc	356	}
darran	0:55a05330f8cc	357
darran	0:55a05330f8cc	358	/**
darran	0:55a05330f8cc	359	* Handle a possible change in the network configuration.
darran	0:55a05330f8cc	360	*
darran	0:55a05330f8cc	361	* If there is an AutoIP address configured, take the interface down
darran	0:55a05330f8cc	362	* and begin probing with the same address.
darran	0:55a05330f8cc	363	*/
darran	0:55a05330f8cc	364	void
darran	0:55a05330f8cc	365	autoip_network_changed(struct netif *netif)
darran	0:55a05330f8cc	366	{
darran	0:55a05330f8cc	367	if (netif->autoip && netif->autoip->state != AUTOIP_STATE_OFF) {
darran	0:55a05330f8cc	368	netif_set_down(netif);
darran	0:55a05330f8cc	369	autoip_start_probing(netif);
darran	0:55a05330f8cc	370	}
darran	0:55a05330f8cc	371	}
darran	0:55a05330f8cc	372
darran	0:55a05330f8cc	373	/**
darran	0:55a05330f8cc	374	* Stop AutoIP client
darran	0:55a05330f8cc	375	*
darran	0:55a05330f8cc	376	* @param netif network interface on which stop the AutoIP client
darran	0:55a05330f8cc	377	*/
darran	0:55a05330f8cc	378	err_t
darran	0:55a05330f8cc	379	autoip_stop(struct netif *netif)
darran	0:55a05330f8cc	380	{
darran	0:55a05330f8cc	381	netif->autoip->state = AUTOIP_STATE_OFF;
darran	0:55a05330f8cc	382	netif_set_down(netif);
darran	0:55a05330f8cc	383	return ERR_OK;
darran	0:55a05330f8cc	384	}
darran	0:55a05330f8cc	385
darran	0:55a05330f8cc	386	/**
darran	0:55a05330f8cc	387	* Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds
darran	0:55a05330f8cc	388	*/
darran	0:55a05330f8cc	389	void
darran	0:55a05330f8cc	390	autoip_tmr()
darran	0:55a05330f8cc	391	{
darran	0:55a05330f8cc	392	struct netif *netif = netif_list;
darran	0:55a05330f8cc	393	/* loop through netif's */
darran	0:55a05330f8cc	394	while (netif != NULL) {
darran	0:55a05330f8cc	395	/* only act on AutoIP configured interfaces */
darran	0:55a05330f8cc	396	if (netif->autoip != NULL) {
darran	0:55a05330f8cc	397	if(netif->autoip->lastconflict > 0) {
darran	0:55a05330f8cc	398	netif->autoip->lastconflict--;
darran	0:55a05330f8cc	399	}
darran	0:55a05330f8cc	400
darran	0:55a05330f8cc	401	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
darran	0:55a05330f8cc	402	("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n",
darran	0:55a05330f8cc	403	(u16_t)(netif->autoip->state), netif->autoip->ttw));
darran	0:55a05330f8cc	404
darran	0:55a05330f8cc	405	switch(netif->autoip->state) {
darran	0:55a05330f8cc	406	case AUTOIP_STATE_PROBING:
darran	0:55a05330f8cc	407	if(netif->autoip->ttw > 0) {
darran	0:55a05330f8cc	408	netif->autoip->ttw--;
darran	0:55a05330f8cc	409	} else {
darran	0:55a05330f8cc	410	if(netif->autoip->sent_num >= PROBE_NUM) {
darran	0:55a05330f8cc	411	netif->autoip->state = AUTOIP_STATE_ANNOUNCING;
darran	0:55a05330f8cc	412	netif->autoip->sent_num = 0;
darran	0:55a05330f8cc	413	netif->autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND;
darran	0:55a05330f8cc	414	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
darran	0:55a05330f8cc	415	("autoip_tmr(): changing state to ANNOUNCING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
darran	0:55a05330f8cc	416	ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
darran	0:55a05330f8cc	417	ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
darran	0:55a05330f8cc	418	} else {
darran	0:55a05330f8cc	419	autoip_arp_probe(netif);
darran	0:55a05330f8cc	420	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
darran	0:55a05330f8cc	421	("autoip_tmr() PROBING Sent Probe\n"));
darran	0:55a05330f8cc	422	netif->autoip->sent_num++;
darran	0:55a05330f8cc	423	/* calculate time to wait to next probe */
darran	0:55a05330f8cc	424	netif->autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) %
darran	0:55a05330f8cc	425	((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) +
darran	0:55a05330f8cc	426	PROBE_MIN * AUTOIP_TICKS_PER_SECOND);
darran	0:55a05330f8cc	427	}
darran	0:55a05330f8cc	428	}
darran	0:55a05330f8cc	429	break;
darran	0:55a05330f8cc	430
darran	0:55a05330f8cc	431	case AUTOIP_STATE_ANNOUNCING:
darran	0:55a05330f8cc	432	if(netif->autoip->ttw > 0) {
darran	0:55a05330f8cc	433	netif->autoip->ttw--;
darran	0:55a05330f8cc	434	} else {
darran	0:55a05330f8cc	435	if(netif->autoip->sent_num == 0) {
darran	0:55a05330f8cc	436	/* We are here the first time, so we waited ANNOUNCE_WAIT seconds
darran	0:55a05330f8cc	437	* Now we can bind to an IP address and use it.
darran	0:55a05330f8cc	438	*
darran	0:55a05330f8cc	439	* autoip_bind calls netif_set_up. This triggers a gratuitous ARP
darran	0:55a05330f8cc	440	* which counts as an announcement.
darran	0:55a05330f8cc	441	*/
darran	0:55a05330f8cc	442	autoip_bind(netif);
darran	0:55a05330f8cc	443	} else {
darran	0:55a05330f8cc	444	autoip_arp_announce(netif);
darran	0:55a05330f8cc	445	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
darran	0:55a05330f8cc	446	("autoip_tmr() ANNOUNCING Sent Announce\n"));
darran	0:55a05330f8cc	447	}
darran	0:55a05330f8cc	448	netif->autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND;
darran	0:55a05330f8cc	449	netif->autoip->sent_num++;
darran	0:55a05330f8cc	450
darran	0:55a05330f8cc	451	if(netif->autoip->sent_num >= ANNOUNCE_NUM) {
darran	0:55a05330f8cc	452	netif->autoip->state = AUTOIP_STATE_BOUND;
darran	0:55a05330f8cc	453	netif->autoip->sent_num = 0;
darran	0:55a05330f8cc	454	netif->autoip->ttw = 0;
darran	0:55a05330f8cc	455	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
darran	0:55a05330f8cc	456	("autoip_tmr(): changing state to BOUND: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
darran	0:55a05330f8cc	457	ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
darran	0:55a05330f8cc	458	ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
darran	0:55a05330f8cc	459	}
darran	0:55a05330f8cc	460	}
darran	0:55a05330f8cc	461	break;
darran	0:55a05330f8cc	462	}
darran	0:55a05330f8cc	463	}
darran	0:55a05330f8cc	464	/* proceed to next network interface */
darran	0:55a05330f8cc	465	netif = netif->next;
darran	0:55a05330f8cc	466	}
darran	0:55a05330f8cc	467	}
darran	0:55a05330f8cc	468
darran	0:55a05330f8cc	469	/**
darran	0:55a05330f8cc	470	* Handles every incoming ARP Packet, called by etharp_arp_input.
darran	0:55a05330f8cc	471	*
darran	0:55a05330f8cc	472	* @param netif network interface to use for autoip processing
darran	0:55a05330f8cc	473	* @param hdr Incoming ARP packet
darran	0:55a05330f8cc	474	*/
darran	0:55a05330f8cc	475	void
darran	0:55a05330f8cc	476	autoip_arp_reply(struct netif netif, struct etharp_hdr hdr)
darran	0:55a05330f8cc	477	{
darran	0:55a05330f8cc	478	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE, ("autoip_arp_reply()\n"));
darran	0:55a05330f8cc	479	if ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) {
darran	0:55a05330f8cc	480	/* when ip.src == llipaddr && hw.src != netif->hwaddr
darran	0:55a05330f8cc	481	*
darran	0:55a05330f8cc	482	* when probing ip.dst == llipaddr && hw.src != netif->hwaddr
darran	0:55a05330f8cc	483	* we have a conflict and must solve it
darran	0:55a05330f8cc	484	*/
darran	0:55a05330f8cc	485	ip_addr_t sipaddr, dipaddr;
darran	0:55a05330f8cc	486	struct eth_addr netifaddr;
darran	0:55a05330f8cc	487	netifaddr.addr[0] = netif->hwaddr[0];
darran	0:55a05330f8cc	488	netifaddr.addr[1] = netif->hwaddr[1];
darran	0:55a05330f8cc	489	netifaddr.addr[2] = netif->hwaddr[2];
darran	0:55a05330f8cc	490	netifaddr.addr[3] = netif->hwaddr[3];
darran	0:55a05330f8cc	491	netifaddr.addr[4] = netif->hwaddr[4];
darran	0:55a05330f8cc	492	netifaddr.addr[5] = netif->hwaddr[5];
darran	0:55a05330f8cc	493
darran	0:55a05330f8cc	494	/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
darran	0:55a05330f8cc	495	* structure packing (not using structure copy which breaks strict-aliasing rules).
darran	0:55a05330f8cc	496	*/
darran	0:55a05330f8cc	497	SMEMCPY(&sipaddr, &hdr->sipaddr, sizeof(sipaddr));
darran	0:55a05330f8cc	498	SMEMCPY(&dipaddr, &hdr->dipaddr, sizeof(dipaddr));
darran	0:55a05330f8cc	499
darran	0:55a05330f8cc	500	if ((netif->autoip->state == AUTOIP_STATE_PROBING) \|\|
darran	0:55a05330f8cc	501	((netif->autoip->state == AUTOIP_STATE_ANNOUNCING) &&
darran	0:55a05330f8cc	502	(netif->autoip->sent_num == 0))) {
darran	0:55a05330f8cc	503	/* RFC 3927 Section 2.2.1:
darran	0:55a05330f8cc	504	* from beginning to after ANNOUNCE_WAIT
darran	0:55a05330f8cc	505	* seconds we have a conflict if
darran	0:55a05330f8cc	506	* ip.src == llipaddr OR
darran	0:55a05330f8cc	507	* ip.dst == llipaddr && hw.src != own hwaddr
darran	0:55a05330f8cc	508	*/
darran	0:55a05330f8cc	509	if ((ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr)) \|\|
darran	0:55a05330f8cc	510	(ip_addr_cmp(&dipaddr, &netif->autoip->llipaddr) &&
darran	0:55a05330f8cc	511	!eth_addr_cmp(&netifaddr, &hdr->shwaddr))) {
darran	0:55a05330f8cc	512	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| LWIP_DBG_LEVEL_WARNING,
darran	0:55a05330f8cc	513	("autoip_arp_reply(): Probe Conflict detected\n"));
darran	0:55a05330f8cc	514	autoip_start(netif);
darran	0:55a05330f8cc	515	}
darran	0:55a05330f8cc	516	} else {
darran	0:55a05330f8cc	517	/* RFC 3927 Section 2.5:
darran	0:55a05330f8cc	518	* in any state we have a conflict if
darran	0:55a05330f8cc	519	* ip.src == llipaddr && hw.src != own hwaddr
darran	0:55a05330f8cc	520	*/
darran	0:55a05330f8cc	521	if (ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr) &&
darran	0:55a05330f8cc	522	!eth_addr_cmp(&netifaddr, &hdr->shwaddr)) {
darran	0:55a05330f8cc	523	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| LWIP_DBG_LEVEL_WARNING,
darran	0:55a05330f8cc	524	("autoip_arp_reply(): Conflicting ARP-Packet detected\n"));
darran	0:55a05330f8cc	525	autoip_handle_arp_conflict(netif);
darran	0:55a05330f8cc	526	}
darran	0:55a05330f8cc	527	}
darran	0:55a05330f8cc	528	}
darran	0:55a05330f8cc	529	}
darran	0:55a05330f8cc	530
darran	0:55a05330f8cc	531	#endif /* LWIP_AUTOIP */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	18 Jun 2010
Imports:	7
Forks:	0
Commits:	2
Dependents:	0
Dependencies:	1
Followers:	1

lwip/core/ipv4/autoip.c@1:4218cacaf696, 2010-06-18 (annotated)

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