AmpereMeter - Example self-announcing webserver which controls …

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Dirk-Willem van Gulik (NXP/mbed) / Mbed 2 deprecated AmpereMeter

Example self-announcing webserver which controls a servo through a smallHTML userinterface.

lwip/core/ipv4/autoip.c@0:a259777c45a3, 2010-08-14 (annotated)

Committer:: dirkx
Date:: Sat Aug 14 15:56:01 2010 +0000
Revision:: 0:a259777c45a3

Who changed what in which revision?

User	Revision	Line number	New contents of line
dirkx	0:a259777c45a3	1	/**
dirkx	0:a259777c45a3	2	* @file
dirkx	0:a259777c45a3	3	* AutoIP Automatic LinkLocal IP Configuration
dirkx	0:a259777c45a3	4	*
dirkx	0:a259777c45a3	5	*/
dirkx	0:a259777c45a3	6
dirkx	0:a259777c45a3	7	/*
dirkx	0:a259777c45a3	8	*
dirkx	0:a259777c45a3	9	* Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
dirkx	0:a259777c45a3	10	* All rights reserved.
dirkx	0:a259777c45a3	11	*
dirkx	0:a259777c45a3	12	* Redistribution and use in source and binary forms, with or without modification,
dirkx	0:a259777c45a3	13	* are permitted provided that the following conditions are met:
dirkx	0:a259777c45a3	14	*
dirkx	0:a259777c45a3	15	* 1. Redistributions of source code must retain the above copyright notice,
dirkx	0:a259777c45a3	16	* this list of conditions and the following disclaimer.
dirkx	0:a259777c45a3	17	* 2. Redistributions in binary form must reproduce the above copyright notice,
dirkx	0:a259777c45a3	18	* this list of conditions and the following disclaimer in the documentation
dirkx	0:a259777c45a3	19	* and/or other materials provided with the distribution.
dirkx	0:a259777c45a3	20	* 3. The name of the author may not be used to endorse or promote products
dirkx	0:a259777c45a3	21	* derived from this software without specific prior written permission.
dirkx	0:a259777c45a3	22	*
dirkx	0:a259777c45a3	23	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
dirkx	0:a259777c45a3	24	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
dirkx	0:a259777c45a3	25	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
dirkx	0:a259777c45a3	26	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
dirkx	0:a259777c45a3	27	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
dirkx	0:a259777c45a3	28	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
dirkx	0:a259777c45a3	29	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
dirkx	0:a259777c45a3	30	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
dirkx	0:a259777c45a3	31	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
dirkx	0:a259777c45a3	32	* OF SUCH DAMAGE.
dirkx	0:a259777c45a3	33	*
dirkx	0:a259777c45a3	34	* Author: Dominik Spies <kontakt@dspies.de>
dirkx	0:a259777c45a3	35	*
dirkx	0:a259777c45a3	36	* This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
dirkx	0:a259777c45a3	37	* with RFC 3927.
dirkx	0:a259777c45a3	38	*
dirkx	0:a259777c45a3	39	*
dirkx	0:a259777c45a3	40	* Please coordinate changes and requests with Dominik Spies
dirkx	0:a259777c45a3	41	* <kontakt@dspies.de>
dirkx	0:a259777c45a3	42	*/
dirkx	0:a259777c45a3	43
dirkx	0:a259777c45a3	44	/*******************************************************************************
dirkx	0:a259777c45a3	45	* USAGE:
dirkx	0:a259777c45a3	46	*
dirkx	0:a259777c45a3	47	* define LWIP_AUTOIP 1 in your lwipopts.h
dirkx	0:a259777c45a3	48	*
dirkx	0:a259777c45a3	49	* If you don't use tcpip.c (so, don't call, you don't call tcpip_init):
dirkx	0:a259777c45a3	50	* - First, call autoip_init().
dirkx	0:a259777c45a3	51	* - call autoip_tmr() all AUTOIP_TMR_INTERVAL msces,
dirkx	0:a259777c45a3	52	* that should be defined in autoip.h.
dirkx	0:a259777c45a3	53	* I recommend a value of 100. The value must divide 1000 with a remainder almost 0.
dirkx	0:a259777c45a3	54	* Possible values are 1000, 500, 333, 250, 200, 166, 142, 125, 111, 100 ....
dirkx	0:a259777c45a3	55	*
dirkx	0:a259777c45a3	56	* Without DHCP:
dirkx	0:a259777c45a3	57	* - Call autoip_start() after netif_add().
dirkx	0:a259777c45a3	58	*
dirkx	0:a259777c45a3	59	* With DHCP:
dirkx	0:a259777c45a3	60	* - define LWIP_DHCP_AUTOIP_COOP 1 in your lwipopts.h.
dirkx	0:a259777c45a3	61	* - Configure your DHCP Client.
dirkx	0:a259777c45a3	62	*
dirkx	0:a259777c45a3	63	*/
dirkx	0:a259777c45a3	64
dirkx	0:a259777c45a3	65	#include "lwip/opt.h"
dirkx	0:a259777c45a3	66
dirkx	0:a259777c45a3	67	#if LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */
dirkx	0:a259777c45a3	68
dirkx	0:a259777c45a3	69	#include "lwip/mem.h"
dirkx	0:a259777c45a3	70	#include "lwip/udp.h"
dirkx	0:a259777c45a3	71	#include "lwip/ip_addr.h"
dirkx	0:a259777c45a3	72	#include "lwip/netif.h"
dirkx	0:a259777c45a3	73	#include "lwip/autoip.h"
dirkx	0:a259777c45a3	74	#include "netif/etharp.h"
dirkx	0:a259777c45a3	75
dirkx	0:a259777c45a3	76	#include <stdlib.h>
dirkx	0:a259777c45a3	77	#include <string.h>
dirkx	0:a259777c45a3	78
dirkx	0:a259777c45a3	79	/* 169.254.0.0 */
dirkx	0:a259777c45a3	80	#define AUTOIP_NET 0xA9FE0000
dirkx	0:a259777c45a3	81	/* 169.254.1.0 */
dirkx	0:a259777c45a3	82	#define AUTOIP_RANGE_START (AUTOIP_NET \| 0x0100)
dirkx	0:a259777c45a3	83	/* 169.254.254.255 */
dirkx	0:a259777c45a3	84	#define AUTOIP_RANGE_END (AUTOIP_NET \| 0xFEFF)
dirkx	0:a259777c45a3	85
dirkx	0:a259777c45a3	86
dirkx	0:a259777c45a3	87	/** Pseudo random macro based on netif informations.
dirkx	0:a259777c45a3	88	* You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */
dirkx	0:a259777c45a3	89	#ifndef LWIP_AUTOIP_RAND
dirkx	0:a259777c45a3	90	#define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) \| \
dirkx	0:a259777c45a3	91	((u32_t)((netif->hwaddr[3]) & 0xff) << 16) \| \
dirkx	0:a259777c45a3	92	((u32_t)((netif->hwaddr[2]) & 0xff) << 8) \| \
dirkx	0:a259777c45a3	93	((u32_t)((netif->hwaddr[4]) & 0xff))) + \
dirkx	0:a259777c45a3	94	(netif->autoip?netif->autoip->tried_llipaddr:0))
dirkx	0:a259777c45a3	95	#endif /* LWIP_AUTOIP_RAND */
dirkx	0:a259777c45a3	96
dirkx	0:a259777c45a3	97	/**
dirkx	0:a259777c45a3	98	* Macro that generates the initial IP address to be tried by AUTOIP.
dirkx	0:a259777c45a3	99	* If you want to override this, define it to something else in lwipopts.h.
dirkx	0:a259777c45a3	100	*/
dirkx	0:a259777c45a3	101	#ifndef LWIP_AUTOIP_CREATE_SEED_ADDR
dirkx	0:a259777c45a3	102	#define LWIP_AUTOIP_CREATE_SEED_ADDR(netif) \
dirkx	0:a259777c45a3	103	htonl(AUTOIP_RANGE_START + ((u32_t)(((u8_t)(netif->hwaddr[4])) \| \
dirkx	0:a259777c45a3	104	((u32_t)((u8_t)(netif->hwaddr[5]))) << 8)))
dirkx	0:a259777c45a3	105	#endif /* LWIP_AUTOIP_CREATE_SEED_ADDR */
dirkx	0:a259777c45a3	106
dirkx	0:a259777c45a3	107	/* static functions */
dirkx	0:a259777c45a3	108	static void autoip_handle_arp_conflict(struct netif *netif);
dirkx	0:a259777c45a3	109
dirkx	0:a259777c45a3	110	/* creates a pseudo random LL IP-Address for a network interface */
dirkx	0:a259777c45a3	111	static void autoip_create_addr(struct netif netif, ip_addr_t ipaddr);
dirkx	0:a259777c45a3	112
dirkx	0:a259777c45a3	113	/* sends an ARP probe */
dirkx	0:a259777c45a3	114	static err_t autoip_arp_probe(struct netif *netif);
dirkx	0:a259777c45a3	115
dirkx	0:a259777c45a3	116	/* sends an ARP announce */
dirkx	0:a259777c45a3	117	static err_t autoip_arp_announce(struct netif *netif);
dirkx	0:a259777c45a3	118
dirkx	0:a259777c45a3	119	/* configure interface for use with current LL IP-Address */
dirkx	0:a259777c45a3	120	static err_t autoip_bind(struct netif *netif);
dirkx	0:a259777c45a3	121
dirkx	0:a259777c45a3	122	/* start sending probes for llipaddr */
dirkx	0:a259777c45a3	123	static void autoip_start_probing(struct netif *netif);
dirkx	0:a259777c45a3	124
dirkx	0:a259777c45a3	125	/**
dirkx	0:a259777c45a3	126	* Initialize this module
dirkx	0:a259777c45a3	127	*/
dirkx	0:a259777c45a3	128	void
dirkx	0:a259777c45a3	129	autoip_init(void)
dirkx	0:a259777c45a3	130	{
dirkx	0:a259777c45a3	131	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE, ("autoip_init()\n"));
dirkx	0:a259777c45a3	132	}
dirkx	0:a259777c45a3	133
dirkx	0:a259777c45a3	134	/** Set a statically allocated struct autoip to work with.
dirkx	0:a259777c45a3	135	* Using this prevents autoip_start to allocate it using mem_malloc.
dirkx	0:a259777c45a3	136	*
dirkx	0:a259777c45a3	137	* @param netif the netif for which to set the struct autoip
dirkx	0:a259777c45a3	138	* @param dhcp (uninitialised) dhcp struct allocated by the application
dirkx	0:a259777c45a3	139	*/
dirkx	0:a259777c45a3	140	void
dirkx	0:a259777c45a3	141	autoip_set_struct(struct netif netif, struct autoip autoip)
dirkx	0:a259777c45a3	142	{
dirkx	0:a259777c45a3	143	LWIP_ASSERT("netif != NULL", netif != NULL);
dirkx	0:a259777c45a3	144	LWIP_ASSERT("autoip != NULL", autoip != NULL);
dirkx	0:a259777c45a3	145	LWIP_ASSERT("netif already has a struct autoip set", netif->autoip == NULL);
dirkx	0:a259777c45a3	146
dirkx	0:a259777c45a3	147	/* clear data structure */
dirkx	0:a259777c45a3	148	memset(autoip, 0, sizeof(struct autoip));
dirkx	0:a259777c45a3	149	/* autoip->state = AUTOIP_STATE_OFF; */
dirkx	0:a259777c45a3	150	netif->autoip = autoip;
dirkx	0:a259777c45a3	151	}
dirkx	0:a259777c45a3	152
dirkx	0:a259777c45a3	153	/**
dirkx	0:a259777c45a3	154	* Handle a IP address conflict after an ARP conflict detection
dirkx	0:a259777c45a3	155	*/
dirkx	0:a259777c45a3	156	static void
dirkx	0:a259777c45a3	157	autoip_handle_arp_conflict(struct netif *netif)
dirkx	0:a259777c45a3	158	{
dirkx	0:a259777c45a3	159	/* Somehow detect if we are defending or retreating */
dirkx	0:a259777c45a3	160	unsigned char defend = 1; /* tbd */
dirkx	0:a259777c45a3	161
dirkx	0:a259777c45a3	162	if(defend) {
dirkx	0:a259777c45a3	163	if(netif->autoip->lastconflict > 0) {
dirkx	0:a259777c45a3	164	/* retreat, there was a conflicting ARP in the last
dirkx	0:a259777c45a3	165	* DEFEND_INTERVAL seconds
dirkx	0:a259777c45a3	166	*/
dirkx	0:a259777c45a3	167	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
dirkx	0:a259777c45a3	168	("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n"));
dirkx	0:a259777c45a3	169
dirkx	0:a259777c45a3	170	/* TODO: close all TCP sessions */
dirkx	0:a259777c45a3	171	autoip_start(netif);
dirkx	0:a259777c45a3	172	} else {
dirkx	0:a259777c45a3	173	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
dirkx	0:a259777c45a3	174	("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n"));
dirkx	0:a259777c45a3	175	autoip_arp_announce(netif);
dirkx	0:a259777c45a3	176	netif->autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_TICKS_PER_SECOND;
dirkx	0:a259777c45a3	177	}
dirkx	0:a259777c45a3	178	} else {
dirkx	0:a259777c45a3	179	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
dirkx	0:a259777c45a3	180	("autoip_handle_arp_conflict(): we do not defend, retreating\n"));
dirkx	0:a259777c45a3	181	/* TODO: close all TCP sessions */
dirkx	0:a259777c45a3	182	autoip_start(netif);
dirkx	0:a259777c45a3	183	}
dirkx	0:a259777c45a3	184	}
dirkx	0:a259777c45a3	185
dirkx	0:a259777c45a3	186	/**
dirkx	0:a259777c45a3	187	* Create an IP-Address out of range 169.254.1.0 to 169.254.254.255
dirkx	0:a259777c45a3	188	*
dirkx	0:a259777c45a3	189	* @param netif network interface on which create the IP-Address
dirkx	0:a259777c45a3	190	* @param ipaddr ip address to initialize
dirkx	0:a259777c45a3	191	*/
dirkx	0:a259777c45a3	192	static void
dirkx	0:a259777c45a3	193	autoip_create_addr(struct netif netif, ip_addr_t ipaddr)
dirkx	0:a259777c45a3	194	{
dirkx	0:a259777c45a3	195	/* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255
dirkx	0:a259777c45a3	196	* compliant to RFC 3927 Section 2.1
dirkx	0:a259777c45a3	197	* We have 254 * 256 possibilities */
dirkx	0:a259777c45a3	198
dirkx	0:a259777c45a3	199	u32_t addr = ntohl(LWIP_AUTOIP_CREATE_SEED_ADDR(netif));
dirkx	0:a259777c45a3	200	addr += netif->autoip->tried_llipaddr;
dirkx	0:a259777c45a3	201	addr = AUTOIP_NET \| (addr & 0xffff);
dirkx	0:a259777c45a3	202	/* Now, 169.254.0.0 <= addr <= 169.254.255.255 */
dirkx	0:a259777c45a3	203
dirkx	0:a259777c45a3	204	if (addr < AUTOIP_RANGE_START) {
dirkx	0:a259777c45a3	205	addr += AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
dirkx	0:a259777c45a3	206	}
dirkx	0:a259777c45a3	207	if (addr > AUTOIP_RANGE_END) {
dirkx	0:a259777c45a3	208	addr -= AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
dirkx	0:a259777c45a3	209	}
dirkx	0:a259777c45a3	210	LWIP_ASSERT("AUTOIP address not in range", (addr >= AUTOIP_RANGE_START) &&
dirkx	0:a259777c45a3	211	(addr <= AUTOIP_RANGE_END));
dirkx	0:a259777c45a3	212	ip4_addr_set_u32(ipaddr, htonl(addr));
dirkx	0:a259777c45a3	213
dirkx	0:a259777c45a3	214	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
dirkx	0:a259777c45a3	215	("autoip_create_addr(): tried_llipaddr=%"U16_F", %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
dirkx	0:a259777c45a3	216	(u16_t)(netif->autoip->tried_llipaddr), ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr),
dirkx	0:a259777c45a3	217	ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
dirkx	0:a259777c45a3	218	}
dirkx	0:a259777c45a3	219
dirkx	0:a259777c45a3	220	/**
dirkx	0:a259777c45a3	221	* Sends an ARP probe from a network interface
dirkx	0:a259777c45a3	222	*
dirkx	0:a259777c45a3	223	* @param netif network interface used to send the probe
dirkx	0:a259777c45a3	224	*/
dirkx	0:a259777c45a3	225	static err_t
dirkx	0:a259777c45a3	226	autoip_arp_probe(struct netif *netif)
dirkx	0:a259777c45a3	227	{
dirkx	0:a259777c45a3	228	return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
dirkx	0:a259777c45a3	229	(struct eth_addr *)netif->hwaddr, IP_ADDR_ANY, &ethzero,
dirkx	0:a259777c45a3	230	&netif->autoip->llipaddr, ARP_REQUEST);
dirkx	0:a259777c45a3	231	}
dirkx	0:a259777c45a3	232
dirkx	0:a259777c45a3	233	/**
dirkx	0:a259777c45a3	234	* Sends an ARP announce from a network interface
dirkx	0:a259777c45a3	235	*
dirkx	0:a259777c45a3	236	* @param netif network interface used to send the announce
dirkx	0:a259777c45a3	237	*/
dirkx	0:a259777c45a3	238	static err_t
dirkx	0:a259777c45a3	239	autoip_arp_announce(struct netif *netif)
dirkx	0:a259777c45a3	240	{
dirkx	0:a259777c45a3	241	return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
dirkx	0:a259777c45a3	242	(struct eth_addr *)netif->hwaddr, &netif->autoip->llipaddr, &ethzero,
dirkx	0:a259777c45a3	243	&netif->autoip->llipaddr, ARP_REQUEST);
dirkx	0:a259777c45a3	244	}
dirkx	0:a259777c45a3	245
dirkx	0:a259777c45a3	246	/**
dirkx	0:a259777c45a3	247	* Configure interface for use with current LL IP-Address
dirkx	0:a259777c45a3	248	*
dirkx	0:a259777c45a3	249	* @param netif network interface to configure with current LL IP-Address
dirkx	0:a259777c45a3	250	*/
dirkx	0:a259777c45a3	251	static err_t
dirkx	0:a259777c45a3	252	autoip_bind(struct netif *netif)
dirkx	0:a259777c45a3	253	{
dirkx	0:a259777c45a3	254	struct autoip *autoip = netif->autoip;
dirkx	0:a259777c45a3	255	ip_addr_t sn_mask, gw_addr;
dirkx	0:a259777c45a3	256
dirkx	0:a259777c45a3	257	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
dirkx	0:a259777c45a3	258	("autoip_bind(netif=%p) %c%c%"U16_F" %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
dirkx	0:a259777c45a3	259	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num,
dirkx	0:a259777c45a3	260	ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr),
dirkx	0:a259777c45a3	261	ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr)));
dirkx	0:a259777c45a3	262
dirkx	0:a259777c45a3	263	IP4_ADDR(&sn_mask, 255, 255, 0, 0);
dirkx	0:a259777c45a3	264	IP4_ADDR(&gw_addr, 0, 0, 0, 0);
dirkx	0:a259777c45a3	265
dirkx	0:a259777c45a3	266	netif_set_ipaddr(netif, &autoip->llipaddr);
dirkx	0:a259777c45a3	267	netif_set_netmask(netif, &sn_mask);
dirkx	0:a259777c45a3	268	netif_set_gw(netif, &gw_addr);
dirkx	0:a259777c45a3	269
dirkx	0:a259777c45a3	270	/* bring the interface up */
dirkx	0:a259777c45a3	271	netif_set_up(netif);
dirkx	0:a259777c45a3	272
dirkx	0:a259777c45a3	273	return ERR_OK;
dirkx	0:a259777c45a3	274	}
dirkx	0:a259777c45a3	275
dirkx	0:a259777c45a3	276	/**
dirkx	0:a259777c45a3	277	* Start AutoIP client
dirkx	0:a259777c45a3	278	*
dirkx	0:a259777c45a3	279	* @param netif network interface on which start the AutoIP client
dirkx	0:a259777c45a3	280	*/
dirkx	0:a259777c45a3	281	err_t
dirkx	0:a259777c45a3	282	autoip_start(struct netif *netif)
dirkx	0:a259777c45a3	283	{
dirkx	0:a259777c45a3	284	struct autoip *autoip = netif->autoip;
dirkx	0:a259777c45a3	285	err_t result = ERR_OK;
dirkx	0:a259777c45a3	286
dirkx	0:a259777c45a3	287	if(netif_is_up(netif)) {
dirkx	0:a259777c45a3	288	netif_set_down(netif);
dirkx	0:a259777c45a3	289	}
dirkx	0:a259777c45a3	290
dirkx	0:a259777c45a3	291	/* Set IP-Address, Netmask and Gateway to 0 to make sure that
dirkx	0:a259777c45a3	292	* ARP Packets are formed correctly
dirkx	0:a259777c45a3	293	*/
dirkx	0:a259777c45a3	294	ip_addr_set_zero(&netif->ip_addr);
dirkx	0:a259777c45a3	295	ip_addr_set_zero(&netif->netmask);
dirkx	0:a259777c45a3	296	ip_addr_set_zero(&netif->gw);
dirkx	0:a259777c45a3	297
dirkx	0:a259777c45a3	298	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
dirkx	0:a259777c45a3	299	("autoip_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0],
dirkx	0:a259777c45a3	300	netif->name[1], (u16_t)netif->num));
dirkx	0:a259777c45a3	301	if(autoip == NULL) {
dirkx	0:a259777c45a3	302	/* no AutoIP client attached yet? */
dirkx	0:a259777c45a3	303	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
dirkx	0:a259777c45a3	304	("autoip_start(): starting new AUTOIP client\n"));
dirkx	0:a259777c45a3	305	autoip = (struct autoip *)mem_malloc(sizeof(struct autoip));
dirkx	0:a259777c45a3	306	if(autoip == NULL) {
dirkx	0:a259777c45a3	307	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
dirkx	0:a259777c45a3	308	("autoip_start(): could not allocate autoip\n"));
dirkx	0:a259777c45a3	309	return ERR_MEM;
dirkx	0:a259777c45a3	310	}
dirkx	0:a259777c45a3	311	memset( autoip, 0, sizeof(struct autoip));
dirkx	0:a259777c45a3	312	/* store this AutoIP client in the netif */
dirkx	0:a259777c45a3	313	netif->autoip = autoip;
dirkx	0:a259777c45a3	314	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE, ("autoip_start(): allocated autoip"));
dirkx	0:a259777c45a3	315	} else {
dirkx	0:a259777c45a3	316	autoip->state = AUTOIP_STATE_OFF;
dirkx	0:a259777c45a3	317	autoip->ttw = 0;
dirkx	0:a259777c45a3	318	autoip->sent_num = 0;
dirkx	0:a259777c45a3	319	memset(&autoip->llipaddr, 0, sizeof(ip_addr_t));
dirkx	0:a259777c45a3	320	autoip->lastconflict = 0;
dirkx	0:a259777c45a3	321	}
dirkx	0:a259777c45a3	322
dirkx	0:a259777c45a3	323	autoip_create_addr(netif, &(autoip->llipaddr));
dirkx	0:a259777c45a3	324	autoip->tried_llipaddr++;
dirkx	0:a259777c45a3	325	autoip_start_probing(netif);
dirkx	0:a259777c45a3	326
dirkx	0:a259777c45a3	327	return result;
dirkx	0:a259777c45a3	328	}
dirkx	0:a259777c45a3	329
dirkx	0:a259777c45a3	330	static void
dirkx	0:a259777c45a3	331	autoip_start_probing(struct netif *netif)
dirkx	0:a259777c45a3	332	{
dirkx	0:a259777c45a3	333	struct autoip *autoip = netif->autoip;
dirkx	0:a259777c45a3	334
dirkx	0:a259777c45a3	335	autoip->state = AUTOIP_STATE_PROBING;
dirkx	0:a259777c45a3	336	autoip->sent_num = 0;
dirkx	0:a259777c45a3	337	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
dirkx	0:a259777c45a3	338	("autoip_start_probing(): changing state to PROBING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
dirkx	0:a259777c45a3	339	ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
dirkx	0:a259777c45a3	340	ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
dirkx	0:a259777c45a3	341
dirkx	0:a259777c45a3	342	/* time to wait to first probe, this is randomly
dirkx	0:a259777c45a3	343	* choosen out of 0 to PROBE_WAIT seconds.
dirkx	0:a259777c45a3	344	* compliant to RFC 3927 Section 2.2.1
dirkx	0:a259777c45a3	345	*/
dirkx	0:a259777c45a3	346	autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND));
dirkx	0:a259777c45a3	347
dirkx	0:a259777c45a3	348	/*
dirkx	0:a259777c45a3	349	* if we tried more then MAX_CONFLICTS we must limit our rate for
dirkx	0:a259777c45a3	350	* accquiring and probing address
dirkx	0:a259777c45a3	351	* compliant to RFC 3927 Section 2.2.1
dirkx	0:a259777c45a3	352	*/
dirkx	0:a259777c45a3	353	if(autoip->tried_llipaddr > MAX_CONFLICTS) {
dirkx	0:a259777c45a3	354	autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND;
dirkx	0:a259777c45a3	355	}
dirkx	0:a259777c45a3	356	}
dirkx	0:a259777c45a3	357
dirkx	0:a259777c45a3	358	/**
dirkx	0:a259777c45a3	359	* Handle a possible change in the network configuration.
dirkx	0:a259777c45a3	360	*
dirkx	0:a259777c45a3	361	* If there is an AutoIP address configured, take the interface down
dirkx	0:a259777c45a3	362	* and begin probing with the same address.
dirkx	0:a259777c45a3	363	*/
dirkx	0:a259777c45a3	364	void
dirkx	0:a259777c45a3	365	autoip_network_changed(struct netif *netif)
dirkx	0:a259777c45a3	366	{
dirkx	0:a259777c45a3	367	if (netif->autoip && netif->autoip->state != AUTOIP_STATE_OFF) {
dirkx	0:a259777c45a3	368	netif_set_down(netif);
dirkx	0:a259777c45a3	369	autoip_start_probing(netif);
dirkx	0:a259777c45a3	370	}
dirkx	0:a259777c45a3	371	}
dirkx	0:a259777c45a3	372
dirkx	0:a259777c45a3	373	/**
dirkx	0:a259777c45a3	374	* Stop AutoIP client
dirkx	0:a259777c45a3	375	*
dirkx	0:a259777c45a3	376	* @param netif network interface on which stop the AutoIP client
dirkx	0:a259777c45a3	377	*/
dirkx	0:a259777c45a3	378	err_t
dirkx	0:a259777c45a3	379	autoip_stop(struct netif *netif)
dirkx	0:a259777c45a3	380	{
dirkx	0:a259777c45a3	381	netif->autoip->state = AUTOIP_STATE_OFF;
dirkx	0:a259777c45a3	382	netif_set_down(netif);
dirkx	0:a259777c45a3	383	return ERR_OK;
dirkx	0:a259777c45a3	384	}
dirkx	0:a259777c45a3	385
dirkx	0:a259777c45a3	386	/**
dirkx	0:a259777c45a3	387	* Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds
dirkx	0:a259777c45a3	388	*/
dirkx	0:a259777c45a3	389	void
dirkx	0:a259777c45a3	390	autoip_tmr()
dirkx	0:a259777c45a3	391	{
dirkx	0:a259777c45a3	392	struct netif *netif = netif_list;
dirkx	0:a259777c45a3	393	/* loop through netif's */
dirkx	0:a259777c45a3	394	while (netif != NULL) {
dirkx	0:a259777c45a3	395	/* only act on AutoIP configured interfaces */
dirkx	0:a259777c45a3	396	if (netif->autoip != NULL) {
dirkx	0:a259777c45a3	397	if(netif->autoip->lastconflict > 0) {
dirkx	0:a259777c45a3	398	netif->autoip->lastconflict--;
dirkx	0:a259777c45a3	399	}
dirkx	0:a259777c45a3	400
dirkx	0:a259777c45a3	401	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
dirkx	0:a259777c45a3	402	("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n",
dirkx	0:a259777c45a3	403	(u16_t)(netif->autoip->state), netif->autoip->ttw));
dirkx	0:a259777c45a3	404
dirkx	0:a259777c45a3	405	switch(netif->autoip->state) {
dirkx	0:a259777c45a3	406	case AUTOIP_STATE_PROBING:
dirkx	0:a259777c45a3	407	if(netif->autoip->ttw > 0) {
dirkx	0:a259777c45a3	408	netif->autoip->ttw--;
dirkx	0:a259777c45a3	409	} else {
dirkx	0:a259777c45a3	410	if(netif->autoip->sent_num >= PROBE_NUM) {
dirkx	0:a259777c45a3	411	netif->autoip->state = AUTOIP_STATE_ANNOUNCING;
dirkx	0:a259777c45a3	412	netif->autoip->sent_num = 0;
dirkx	0:a259777c45a3	413	netif->autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND;
dirkx	0:a259777c45a3	414	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
dirkx	0:a259777c45a3	415	("autoip_tmr(): changing state to ANNOUNCING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
dirkx	0:a259777c45a3	416	ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
dirkx	0:a259777c45a3	417	ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
dirkx	0:a259777c45a3	418	} else {
dirkx	0:a259777c45a3	419	autoip_arp_probe(netif);
dirkx	0:a259777c45a3	420	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
dirkx	0:a259777c45a3	421	("autoip_tmr() PROBING Sent Probe\n"));
dirkx	0:a259777c45a3	422	netif->autoip->sent_num++;
dirkx	0:a259777c45a3	423	/* calculate time to wait to next probe */
dirkx	0:a259777c45a3	424	netif->autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) %
dirkx	0:a259777c45a3	425	((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) +
dirkx	0:a259777c45a3	426	PROBE_MIN * AUTOIP_TICKS_PER_SECOND);
dirkx	0:a259777c45a3	427	}
dirkx	0:a259777c45a3	428	}
dirkx	0:a259777c45a3	429	break;
dirkx	0:a259777c45a3	430
dirkx	0:a259777c45a3	431	case AUTOIP_STATE_ANNOUNCING:
dirkx	0:a259777c45a3	432	if(netif->autoip->ttw > 0) {
dirkx	0:a259777c45a3	433	netif->autoip->ttw--;
dirkx	0:a259777c45a3	434	} else {
dirkx	0:a259777c45a3	435	if(netif->autoip->sent_num == 0) {
dirkx	0:a259777c45a3	436	/* We are here the first time, so we waited ANNOUNCE_WAIT seconds
dirkx	0:a259777c45a3	437	* Now we can bind to an IP address and use it.
dirkx	0:a259777c45a3	438	*
dirkx	0:a259777c45a3	439	* autoip_bind calls netif_set_up. This triggers a gratuitous ARP
dirkx	0:a259777c45a3	440	* which counts as an announcement.
dirkx	0:a259777c45a3	441	*/
dirkx	0:a259777c45a3	442	autoip_bind(netif);
dirkx	0:a259777c45a3	443	} else {
dirkx	0:a259777c45a3	444	autoip_arp_announce(netif);
dirkx	0:a259777c45a3	445	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
dirkx	0:a259777c45a3	446	("autoip_tmr() ANNOUNCING Sent Announce\n"));
dirkx	0:a259777c45a3	447	}
dirkx	0:a259777c45a3	448	netif->autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND;
dirkx	0:a259777c45a3	449	netif->autoip->sent_num++;
dirkx	0:a259777c45a3	450
dirkx	0:a259777c45a3	451	if(netif->autoip->sent_num >= ANNOUNCE_NUM) {
dirkx	0:a259777c45a3	452	netif->autoip->state = AUTOIP_STATE_BOUND;
dirkx	0:a259777c45a3	453	netif->autoip->sent_num = 0;
dirkx	0:a259777c45a3	454	netif->autoip->ttw = 0;
dirkx	0:a259777c45a3	455	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
dirkx	0:a259777c45a3	456	("autoip_tmr(): changing state to BOUND: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
dirkx	0:a259777c45a3	457	ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
dirkx	0:a259777c45a3	458	ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
dirkx	0:a259777c45a3	459	}
dirkx	0:a259777c45a3	460	}
dirkx	0:a259777c45a3	461	break;
dirkx	0:a259777c45a3	462	}
dirkx	0:a259777c45a3	463	}
dirkx	0:a259777c45a3	464	/* proceed to next network interface */
dirkx	0:a259777c45a3	465	netif = netif->next;
dirkx	0:a259777c45a3	466	}
dirkx	0:a259777c45a3	467	}
dirkx	0:a259777c45a3	468
dirkx	0:a259777c45a3	469	/**
dirkx	0:a259777c45a3	470	* Handles every incoming ARP Packet, called by etharp_arp_input.
dirkx	0:a259777c45a3	471	*
dirkx	0:a259777c45a3	472	* @param netif network interface to use for autoip processing
dirkx	0:a259777c45a3	473	* @param hdr Incoming ARP packet
dirkx	0:a259777c45a3	474	*/
dirkx	0:a259777c45a3	475	void
dirkx	0:a259777c45a3	476	autoip_arp_reply(struct netif netif, struct etharp_hdr hdr)
dirkx	0:a259777c45a3	477	{
dirkx	0:a259777c45a3	478	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE, ("autoip_arp_reply()\n"));
dirkx	0:a259777c45a3	479	if ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) {
dirkx	0:a259777c45a3	480	/* when ip.src == llipaddr && hw.src != netif->hwaddr
dirkx	0:a259777c45a3	481	*
dirkx	0:a259777c45a3	482	* when probing ip.dst == llipaddr && hw.src != netif->hwaddr
dirkx	0:a259777c45a3	483	* we have a conflict and must solve it
dirkx	0:a259777c45a3	484	*/
dirkx	0:a259777c45a3	485	ip_addr_t sipaddr, dipaddr;
dirkx	0:a259777c45a3	486	struct eth_addr netifaddr;
dirkx	0:a259777c45a3	487	netifaddr.addr[0] = netif->hwaddr[0];
dirkx	0:a259777c45a3	488	netifaddr.addr[1] = netif->hwaddr[1];
dirkx	0:a259777c45a3	489	netifaddr.addr[2] = netif->hwaddr[2];
dirkx	0:a259777c45a3	490	netifaddr.addr[3] = netif->hwaddr[3];
dirkx	0:a259777c45a3	491	netifaddr.addr[4] = netif->hwaddr[4];
dirkx	0:a259777c45a3	492	netifaddr.addr[5] = netif->hwaddr[5];
dirkx	0:a259777c45a3	493
dirkx	0:a259777c45a3	494	/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
dirkx	0:a259777c45a3	495	* structure packing (not using structure copy which breaks strict-aliasing rules).
dirkx	0:a259777c45a3	496	*/
dirkx	0:a259777c45a3	497	SMEMCPY(&sipaddr, &hdr->sipaddr, sizeof(sipaddr));
dirkx	0:a259777c45a3	498	SMEMCPY(&dipaddr, &hdr->dipaddr, sizeof(dipaddr));
dirkx	0:a259777c45a3	499
dirkx	0:a259777c45a3	500	if ((netif->autoip->state == AUTOIP_STATE_PROBING) \|\|
dirkx	0:a259777c45a3	501	((netif->autoip->state == AUTOIP_STATE_ANNOUNCING) &&
dirkx	0:a259777c45a3	502	(netif->autoip->sent_num == 0))) {
dirkx	0:a259777c45a3	503	/* RFC 3927 Section 2.2.1:
dirkx	0:a259777c45a3	504	* from beginning to after ANNOUNCE_WAIT
dirkx	0:a259777c45a3	505	* seconds we have a conflict if
dirkx	0:a259777c45a3	506	* ip.src == llipaddr OR
dirkx	0:a259777c45a3	507	* ip.dst == llipaddr && hw.src != own hwaddr
dirkx	0:a259777c45a3	508	*/
dirkx	0:a259777c45a3	509	if ((ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr)) \|\|
dirkx	0:a259777c45a3	510	(ip_addr_cmp(&dipaddr, &netif->autoip->llipaddr) &&
dirkx	0:a259777c45a3	511	!eth_addr_cmp(&netifaddr, &hdr->shwaddr))) {
dirkx	0:a259777c45a3	512	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| LWIP_DBG_LEVEL_WARNING,
dirkx	0:a259777c45a3	513	("autoip_arp_reply(): Probe Conflict detected\n"));
dirkx	0:a259777c45a3	514	autoip_start(netif);
dirkx	0:a259777c45a3	515	}
dirkx	0:a259777c45a3	516	} else {
dirkx	0:a259777c45a3	517	/* RFC 3927 Section 2.5:
dirkx	0:a259777c45a3	518	* in any state we have a conflict if
dirkx	0:a259777c45a3	519	* ip.src == llipaddr && hw.src != own hwaddr
dirkx	0:a259777c45a3	520	*/
dirkx	0:a259777c45a3	521	if (ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr) &&
dirkx	0:a259777c45a3	522	!eth_addr_cmp(&netifaddr, &hdr->shwaddr)) {
dirkx	0:a259777c45a3	523	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| LWIP_DBG_LEVEL_WARNING,
dirkx	0:a259777c45a3	524	("autoip_arp_reply(): Conflicting ARP-Packet detected\n"));
dirkx	0:a259777c45a3	525	autoip_handle_arp_conflict(netif);
dirkx	0:a259777c45a3	526	}
dirkx	0:a259777c45a3	527	}
dirkx	0:a259777c45a3	528	}
dirkx	0:a259777c45a3	529	}
dirkx	0:a259777c45a3	530
dirkx	0:a259777c45a3	531	#endif /* LWIP_AUTOIP */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	14 Aug 2010
Imports:	49
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	2
Followers:	1

lwip/core/ipv4/autoip.c@0:a259777c45a3, 2010-08-14 (annotated)

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