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Adam Green / Mbed 2 deprecated WeatherStation

Web server based weather station using Sparkfun Weather Meters.

Dependencies: FatFileSystem mbed WeatherMeters SDFileSystem

NetStack/lwip/core/ipv4/autoip.c@0:616601bde9fb, 2012-02-23 (annotated)

Committer:: AdamGreen
Date:: Thu Feb 23 21:38:39 2012 +0000
Revision:: 0:616601bde9fb

Who changed what in which revision?

User	Revision	Line number	New contents of line
AdamGreen	0:616601bde9fb	1	/**
AdamGreen	0:616601bde9fb	2	* @file
AdamGreen	0:616601bde9fb	3	* AutoIP Automatic LinkLocal IP Configuration
AdamGreen	0:616601bde9fb	4	*
AdamGreen	0:616601bde9fb	5	*/
AdamGreen	0:616601bde9fb	6
AdamGreen	0:616601bde9fb	7	/*
AdamGreen	0:616601bde9fb	8	*
AdamGreen	0:616601bde9fb	9	* Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
AdamGreen	0:616601bde9fb	10	* All rights reserved.
AdamGreen	0:616601bde9fb	11	*
AdamGreen	0:616601bde9fb	12	* Redistribution and use in source and binary forms, with or without modification,
AdamGreen	0:616601bde9fb	13	* are permitted provided that the following conditions are met:
AdamGreen	0:616601bde9fb	14	*
AdamGreen	0:616601bde9fb	15	* 1. Redistributions of source code must retain the above copyright notice,
AdamGreen	0:616601bde9fb	16	* this list of conditions and the following disclaimer.
AdamGreen	0:616601bde9fb	17	* 2. Redistributions in binary form must reproduce the above copyright notice,
AdamGreen	0:616601bde9fb	18	* this list of conditions and the following disclaimer in the documentation
AdamGreen	0:616601bde9fb	19	* and/or other materials provided with the distribution.
AdamGreen	0:616601bde9fb	20	* 3. The name of the author may not be used to endorse or promote products
AdamGreen	0:616601bde9fb	21	* derived from this software without specific prior written permission.
AdamGreen	0:616601bde9fb	22	*
AdamGreen	0:616601bde9fb	23	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
AdamGreen	0:616601bde9fb	24	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
AdamGreen	0:616601bde9fb	25	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
AdamGreen	0:616601bde9fb	26	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
AdamGreen	0:616601bde9fb	27	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
AdamGreen	0:616601bde9fb	28	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
AdamGreen	0:616601bde9fb	29	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
AdamGreen	0:616601bde9fb	30	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
AdamGreen	0:616601bde9fb	31	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
AdamGreen	0:616601bde9fb	32	* OF SUCH DAMAGE.
AdamGreen	0:616601bde9fb	33	*
AdamGreen	0:616601bde9fb	34	* Author: Dominik Spies <kontakt@dspies.de>
AdamGreen	0:616601bde9fb	35	*
AdamGreen	0:616601bde9fb	36	* This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
AdamGreen	0:616601bde9fb	37	* with RFC 3927.
AdamGreen	0:616601bde9fb	38	*
AdamGreen	0:616601bde9fb	39	*
AdamGreen	0:616601bde9fb	40	* Please coordinate changes and requests with Dominik Spies
AdamGreen	0:616601bde9fb	41	* <kontakt@dspies.de>
AdamGreen	0:616601bde9fb	42	*/
AdamGreen	0:616601bde9fb	43
AdamGreen	0:616601bde9fb	44	/*******************************************************************************
AdamGreen	0:616601bde9fb	45	* USAGE:
AdamGreen	0:616601bde9fb	46	*
AdamGreen	0:616601bde9fb	47	* define LWIP_AUTOIP 1 in your lwipopts.h
AdamGreen	0:616601bde9fb	48	*
AdamGreen	0:616601bde9fb	49	* If you don't use tcpip.c (so, don't call, you don't call tcpip_init):
AdamGreen	0:616601bde9fb	50	* - First, call autoip_init().
AdamGreen	0:616601bde9fb	51	* - call autoip_tmr() all AUTOIP_TMR_INTERVAL msces,
AdamGreen	0:616601bde9fb	52	* that should be defined in autoip.h.
AdamGreen	0:616601bde9fb	53	* I recommend a value of 100. The value must divide 1000 with a remainder almost 0.
AdamGreen	0:616601bde9fb	54	* Possible values are 1000, 500, 333, 250, 200, 166, 142, 125, 111, 100 ....
AdamGreen	0:616601bde9fb	55	*
AdamGreen	0:616601bde9fb	56	* Without DHCP:
AdamGreen	0:616601bde9fb	57	* - Call autoip_start() after netif_add().
AdamGreen	0:616601bde9fb	58	*
AdamGreen	0:616601bde9fb	59	* With DHCP:
AdamGreen	0:616601bde9fb	60	* - define LWIP_DHCP_AUTOIP_COOP 1 in your lwipopts.h.
AdamGreen	0:616601bde9fb	61	* - Configure your DHCP Client.
AdamGreen	0:616601bde9fb	62	*
AdamGreen	0:616601bde9fb	63	*/
AdamGreen	0:616601bde9fb	64
AdamGreen	0:616601bde9fb	65	#include "lwip/opt.h"
AdamGreen	0:616601bde9fb	66
AdamGreen	0:616601bde9fb	67	#if LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */
AdamGreen	0:616601bde9fb	68
AdamGreen	0:616601bde9fb	69	#include "lwip/mem.h"
AdamGreen	0:616601bde9fb	70	#include "lwip/udp.h"
AdamGreen	0:616601bde9fb	71	#include "lwip/ip_addr.h"
AdamGreen	0:616601bde9fb	72	#include "lwip/netif.h"
AdamGreen	0:616601bde9fb	73	#include "lwip/autoip.h"
AdamGreen	0:616601bde9fb	74	#include "netif/etharp.h"
AdamGreen	0:616601bde9fb	75
AdamGreen	0:616601bde9fb	76	#include <stdlib.h>
AdamGreen	0:616601bde9fb	77	#include <string.h>
AdamGreen	0:616601bde9fb	78
AdamGreen	0:616601bde9fb	79	/* 169.254.0.0 */
AdamGreen	0:616601bde9fb	80	#define AUTOIP_NET 0xA9FE0000
AdamGreen	0:616601bde9fb	81	/* 169.254.1.0 */
AdamGreen	0:616601bde9fb	82	#define AUTOIP_RANGE_START (AUTOIP_NET \| 0x0100)
AdamGreen	0:616601bde9fb	83	/* 169.254.254.255 */
AdamGreen	0:616601bde9fb	84	#define AUTOIP_RANGE_END (AUTOIP_NET \| 0xFEFF)
AdamGreen	0:616601bde9fb	85
AdamGreen	0:616601bde9fb	86
AdamGreen	0:616601bde9fb	87	/** Pseudo random macro based on netif informations.
AdamGreen	0:616601bde9fb	88	* You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */
AdamGreen	0:616601bde9fb	89	#ifndef LWIP_AUTOIP_RAND
AdamGreen	0:616601bde9fb	90	#define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) \| \
AdamGreen	0:616601bde9fb	91	((u32_t)((netif->hwaddr[3]) & 0xff) << 16) \| \
AdamGreen	0:616601bde9fb	92	((u32_t)((netif->hwaddr[2]) & 0xff) << 8) \| \
AdamGreen	0:616601bde9fb	93	((u32_t)((netif->hwaddr[4]) & 0xff))) + \
AdamGreen	0:616601bde9fb	94	(netif->autoip?netif->autoip->tried_llipaddr:0))
AdamGreen	0:616601bde9fb	95	#endif /* LWIP_AUTOIP_RAND */
AdamGreen	0:616601bde9fb	96
AdamGreen	0:616601bde9fb	97	/**
AdamGreen	0:616601bde9fb	98	* Macro that generates the initial IP address to be tried by AUTOIP.
AdamGreen	0:616601bde9fb	99	* If you want to override this, define it to something else in lwipopts.h.
AdamGreen	0:616601bde9fb	100	*/
AdamGreen	0:616601bde9fb	101	#ifndef LWIP_AUTOIP_CREATE_SEED_ADDR
AdamGreen	0:616601bde9fb	102	#define LWIP_AUTOIP_CREATE_SEED_ADDR(netif) \
AdamGreen	0:616601bde9fb	103	htonl(AUTOIP_RANGE_START + ((u32_t)(((u8_t)(netif->hwaddr[4])) \| \
AdamGreen	0:616601bde9fb	104	((u32_t)((u8_t)(netif->hwaddr[5]))) << 8)))
AdamGreen	0:616601bde9fb	105	#endif /* LWIP_AUTOIP_CREATE_SEED_ADDR */
AdamGreen	0:616601bde9fb	106
AdamGreen	0:616601bde9fb	107	/* static functions */
AdamGreen	0:616601bde9fb	108	static void autoip_handle_arp_conflict(struct netif *netif);
AdamGreen	0:616601bde9fb	109
AdamGreen	0:616601bde9fb	110	/* creates a pseudo random LL IP-Address for a network interface */
AdamGreen	0:616601bde9fb	111	static void autoip_create_addr(struct netif netif, ip_addr_t ipaddr);
AdamGreen	0:616601bde9fb	112
AdamGreen	0:616601bde9fb	113	/* sends an ARP probe */
AdamGreen	0:616601bde9fb	114	static err_t autoip_arp_probe(struct netif *netif);
AdamGreen	0:616601bde9fb	115
AdamGreen	0:616601bde9fb	116	/* sends an ARP announce */
AdamGreen	0:616601bde9fb	117	static err_t autoip_arp_announce(struct netif *netif);
AdamGreen	0:616601bde9fb	118
AdamGreen	0:616601bde9fb	119	/* configure interface for use with current LL IP-Address */
AdamGreen	0:616601bde9fb	120	static err_t autoip_bind(struct netif *netif);
AdamGreen	0:616601bde9fb	121
AdamGreen	0:616601bde9fb	122	/* start sending probes for llipaddr */
AdamGreen	0:616601bde9fb	123	static void autoip_start_probing(struct netif *netif);
AdamGreen	0:616601bde9fb	124
AdamGreen	0:616601bde9fb	125	/**
AdamGreen	0:616601bde9fb	126	* Initialize this module
AdamGreen	0:616601bde9fb	127	*/
AdamGreen	0:616601bde9fb	128	void
AdamGreen	0:616601bde9fb	129	autoip_init(void)
AdamGreen	0:616601bde9fb	130	{
AdamGreen	0:616601bde9fb	131	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE, ("autoip_init()\n"));
AdamGreen	0:616601bde9fb	132	}
AdamGreen	0:616601bde9fb	133
AdamGreen	0:616601bde9fb	134	/** Set a statically allocated struct autoip to work with.
AdamGreen	0:616601bde9fb	135	* Using this prevents autoip_start to allocate it using mem_malloc.
AdamGreen	0:616601bde9fb	136	*
AdamGreen	0:616601bde9fb	137	* @param netif the netif for which to set the struct autoip
AdamGreen	0:616601bde9fb	138	* @param dhcp (uninitialised) dhcp struct allocated by the application
AdamGreen	0:616601bde9fb	139	*/
AdamGreen	0:616601bde9fb	140	void
AdamGreen	0:616601bde9fb	141	autoip_set_struct(struct netif netif, struct autoip autoip)
AdamGreen	0:616601bde9fb	142	{
AdamGreen	0:616601bde9fb	143	LWIP_ASSERT("netif != NULL", netif != NULL);
AdamGreen	0:616601bde9fb	144	LWIP_ASSERT("autoip != NULL", autoip != NULL);
AdamGreen	0:616601bde9fb	145	LWIP_ASSERT("netif already has a struct autoip set", netif->autoip == NULL);
AdamGreen	0:616601bde9fb	146
AdamGreen	0:616601bde9fb	147	/* clear data structure */
AdamGreen	0:616601bde9fb	148	memset(autoip, 0, sizeof(struct autoip));
AdamGreen	0:616601bde9fb	149	/* autoip->state = AUTOIP_STATE_OFF; */
AdamGreen	0:616601bde9fb	150	netif->autoip = autoip;
AdamGreen	0:616601bde9fb	151	}
AdamGreen	0:616601bde9fb	152
AdamGreen	0:616601bde9fb	153	/** Restart AutoIP client and check the next address (conflict detected)
AdamGreen	0:616601bde9fb	154	*
AdamGreen	0:616601bde9fb	155	* @param netif The netif under AutoIP control
AdamGreen	0:616601bde9fb	156	*/
AdamGreen	0:616601bde9fb	157	static void
AdamGreen	0:616601bde9fb	158	autoip_restart(struct netif *netif)
AdamGreen	0:616601bde9fb	159	{
AdamGreen	0:616601bde9fb	160	netif->autoip->tried_llipaddr++;
AdamGreen	0:616601bde9fb	161	autoip_start(netif);
AdamGreen	0:616601bde9fb	162	}
AdamGreen	0:616601bde9fb	163
AdamGreen	0:616601bde9fb	164	/**
AdamGreen	0:616601bde9fb	165	* Handle a IP address conflict after an ARP conflict detection
AdamGreen	0:616601bde9fb	166	*/
AdamGreen	0:616601bde9fb	167	static void
AdamGreen	0:616601bde9fb	168	autoip_handle_arp_conflict(struct netif *netif)
AdamGreen	0:616601bde9fb	169	{
AdamGreen	0:616601bde9fb	170	/* Somehow detect if we are defending or retreating */
AdamGreen	0:616601bde9fb	171	unsigned char defend = 1; /* tbd */
AdamGreen	0:616601bde9fb	172
AdamGreen	0:616601bde9fb	173	if(defend) {
AdamGreen	0:616601bde9fb	174	if(netif->autoip->lastconflict > 0) {
AdamGreen	0:616601bde9fb	175	/* retreat, there was a conflicting ARP in the last
AdamGreen	0:616601bde9fb	176	* DEFEND_INTERVAL seconds
AdamGreen	0:616601bde9fb	177	*/
AdamGreen	0:616601bde9fb	178	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
AdamGreen	0:616601bde9fb	179	("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n"));
AdamGreen	0:616601bde9fb	180
AdamGreen	0:616601bde9fb	181	/* TODO: close all TCP sessions */
AdamGreen	0:616601bde9fb	182	autoip_restart(netif);
AdamGreen	0:616601bde9fb	183	} else {
AdamGreen	0:616601bde9fb	184	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
AdamGreen	0:616601bde9fb	185	("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n"));
AdamGreen	0:616601bde9fb	186	autoip_arp_announce(netif);
AdamGreen	0:616601bde9fb	187	netif->autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_TICKS_PER_SECOND;
AdamGreen	0:616601bde9fb	188	}
AdamGreen	0:616601bde9fb	189	} else {
AdamGreen	0:616601bde9fb	190	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
AdamGreen	0:616601bde9fb	191	("autoip_handle_arp_conflict(): we do not defend, retreating\n"));
AdamGreen	0:616601bde9fb	192	/* TODO: close all TCP sessions */
AdamGreen	0:616601bde9fb	193	autoip_restart(netif);
AdamGreen	0:616601bde9fb	194	}
AdamGreen	0:616601bde9fb	195	}
AdamGreen	0:616601bde9fb	196
AdamGreen	0:616601bde9fb	197	/**
AdamGreen	0:616601bde9fb	198	* Create an IP-Address out of range 169.254.1.0 to 169.254.254.255
AdamGreen	0:616601bde9fb	199	*
AdamGreen	0:616601bde9fb	200	* @param netif network interface on which create the IP-Address
AdamGreen	0:616601bde9fb	201	* @param ipaddr ip address to initialize
AdamGreen	0:616601bde9fb	202	*/
AdamGreen	0:616601bde9fb	203	static void
AdamGreen	0:616601bde9fb	204	autoip_create_addr(struct netif netif, ip_addr_t ipaddr)
AdamGreen	0:616601bde9fb	205	{
AdamGreen	0:616601bde9fb	206	/* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255
AdamGreen	0:616601bde9fb	207	* compliant to RFC 3927 Section 2.1
AdamGreen	0:616601bde9fb	208	* We have 254 * 256 possibilities */
AdamGreen	0:616601bde9fb	209
AdamGreen	0:616601bde9fb	210	u32_t addr = ntohl(LWIP_AUTOIP_CREATE_SEED_ADDR(netif));
AdamGreen	0:616601bde9fb	211	addr += netif->autoip->tried_llipaddr;
AdamGreen	0:616601bde9fb	212	addr = AUTOIP_NET \| (addr & 0xffff);
AdamGreen	0:616601bde9fb	213	/* Now, 169.254.0.0 <= addr <= 169.254.255.255 */
AdamGreen	0:616601bde9fb	214
AdamGreen	0:616601bde9fb	215	if (addr < AUTOIP_RANGE_START) {
AdamGreen	0:616601bde9fb	216	addr += AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
AdamGreen	0:616601bde9fb	217	}
AdamGreen	0:616601bde9fb	218	if (addr > AUTOIP_RANGE_END) {
AdamGreen	0:616601bde9fb	219	addr -= AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
AdamGreen	0:616601bde9fb	220	}
AdamGreen	0:616601bde9fb	221	LWIP_ASSERT("AUTOIP address not in range", (addr >= AUTOIP_RANGE_START) &&
AdamGreen	0:616601bde9fb	222	(addr <= AUTOIP_RANGE_END));
AdamGreen	0:616601bde9fb	223	ip4_addr_set_u32(ipaddr, htonl(addr));
AdamGreen	0:616601bde9fb	224
AdamGreen	0:616601bde9fb	225	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
AdamGreen	0:616601bde9fb	226	("autoip_create_addr(): tried_llipaddr=%"U16_F", %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
AdamGreen	0:616601bde9fb	227	(u16_t)(netif->autoip->tried_llipaddr), ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr),
AdamGreen	0:616601bde9fb	228	ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
AdamGreen	0:616601bde9fb	229	}
AdamGreen	0:616601bde9fb	230
AdamGreen	0:616601bde9fb	231	/**
AdamGreen	0:616601bde9fb	232	* Sends an ARP probe from a network interface
AdamGreen	0:616601bde9fb	233	*
AdamGreen	0:616601bde9fb	234	* @param netif network interface used to send the probe
AdamGreen	0:616601bde9fb	235	*/
AdamGreen	0:616601bde9fb	236	static err_t
AdamGreen	0:616601bde9fb	237	autoip_arp_probe(struct netif *netif)
AdamGreen	0:616601bde9fb	238	{
AdamGreen	0:616601bde9fb	239	return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
AdamGreen	0:616601bde9fb	240	(struct eth_addr *)netif->hwaddr, IP_ADDR_ANY, &ethzero,
AdamGreen	0:616601bde9fb	241	&netif->autoip->llipaddr, ARP_REQUEST);
AdamGreen	0:616601bde9fb	242	}
AdamGreen	0:616601bde9fb	243
AdamGreen	0:616601bde9fb	244	/**
AdamGreen	0:616601bde9fb	245	* Sends an ARP announce from a network interface
AdamGreen	0:616601bde9fb	246	*
AdamGreen	0:616601bde9fb	247	* @param netif network interface used to send the announce
AdamGreen	0:616601bde9fb	248	*/
AdamGreen	0:616601bde9fb	249	static err_t
AdamGreen	0:616601bde9fb	250	autoip_arp_announce(struct netif *netif)
AdamGreen	0:616601bde9fb	251	{
AdamGreen	0:616601bde9fb	252	return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
AdamGreen	0:616601bde9fb	253	(struct eth_addr *)netif->hwaddr, &netif->autoip->llipaddr, &ethzero,
AdamGreen	0:616601bde9fb	254	&netif->autoip->llipaddr, ARP_REQUEST);
AdamGreen	0:616601bde9fb	255	}
AdamGreen	0:616601bde9fb	256
AdamGreen	0:616601bde9fb	257	/**
AdamGreen	0:616601bde9fb	258	* Configure interface for use with current LL IP-Address
AdamGreen	0:616601bde9fb	259	*
AdamGreen	0:616601bde9fb	260	* @param netif network interface to configure with current LL IP-Address
AdamGreen	0:616601bde9fb	261	*/
AdamGreen	0:616601bde9fb	262	static err_t
AdamGreen	0:616601bde9fb	263	autoip_bind(struct netif *netif)
AdamGreen	0:616601bde9fb	264	{
AdamGreen	0:616601bde9fb	265	struct autoip *autoip = netif->autoip;
AdamGreen	0:616601bde9fb	266	ip_addr_t sn_mask, gw_addr;
AdamGreen	0:616601bde9fb	267
AdamGreen	0:616601bde9fb	268	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
AdamGreen	0:616601bde9fb	269	("autoip_bind(netif=%p) %c%c%"U16_F" %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
AdamGreen	0:616601bde9fb	270	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num,
AdamGreen	0:616601bde9fb	271	ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr),
AdamGreen	0:616601bde9fb	272	ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr)));
AdamGreen	0:616601bde9fb	273
AdamGreen	0:616601bde9fb	274	IP4_ADDR(&sn_mask, 255, 255, 0, 0);
AdamGreen	0:616601bde9fb	275	IP4_ADDR(&gw_addr, 0, 0, 0, 0);
AdamGreen	0:616601bde9fb	276
AdamGreen	0:616601bde9fb	277	netif_set_ipaddr(netif, &autoip->llipaddr);
AdamGreen	0:616601bde9fb	278	netif_set_netmask(netif, &sn_mask);
AdamGreen	0:616601bde9fb	279	netif_set_gw(netif, &gw_addr);
AdamGreen	0:616601bde9fb	280
AdamGreen	0:616601bde9fb	281	/* bring the interface up */
AdamGreen	0:616601bde9fb	282	netif_set_up(netif);
AdamGreen	0:616601bde9fb	283
AdamGreen	0:616601bde9fb	284	return ERR_OK;
AdamGreen	0:616601bde9fb	285	}
AdamGreen	0:616601bde9fb	286
AdamGreen	0:616601bde9fb	287	/**
AdamGreen	0:616601bde9fb	288	* Start AutoIP client
AdamGreen	0:616601bde9fb	289	*
AdamGreen	0:616601bde9fb	290	* @param netif network interface on which start the AutoIP client
AdamGreen	0:616601bde9fb	291	*/
AdamGreen	0:616601bde9fb	292	err_t
AdamGreen	0:616601bde9fb	293	autoip_start(struct netif *netif)
AdamGreen	0:616601bde9fb	294	{
AdamGreen	0:616601bde9fb	295	struct autoip *autoip = netif->autoip;
AdamGreen	0:616601bde9fb	296	err_t result = ERR_OK;
AdamGreen	0:616601bde9fb	297
AdamGreen	0:616601bde9fb	298	if(netif_is_up(netif)) {
AdamGreen	0:616601bde9fb	299	netif_set_down(netif);
AdamGreen	0:616601bde9fb	300	}
AdamGreen	0:616601bde9fb	301
AdamGreen	0:616601bde9fb	302	/* Set IP-Address, Netmask and Gateway to 0 to make sure that
AdamGreen	0:616601bde9fb	303	* ARP Packets are formed correctly
AdamGreen	0:616601bde9fb	304	*/
AdamGreen	0:616601bde9fb	305	ip_addr_set_zero(&netif->ip_addr);
AdamGreen	0:616601bde9fb	306	ip_addr_set_zero(&netif->netmask);
AdamGreen	0:616601bde9fb	307	ip_addr_set_zero(&netif->gw);
AdamGreen	0:616601bde9fb	308
AdamGreen	0:616601bde9fb	309	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
AdamGreen	0:616601bde9fb	310	("autoip_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0],
AdamGreen	0:616601bde9fb	311	netif->name[1], (u16_t)netif->num));
AdamGreen	0:616601bde9fb	312	if(autoip == NULL) {
AdamGreen	0:616601bde9fb	313	/* no AutoIP client attached yet? */
AdamGreen	0:616601bde9fb	314	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
AdamGreen	0:616601bde9fb	315	("autoip_start(): starting new AUTOIP client\n"));
AdamGreen	0:616601bde9fb	316	autoip = (struct autoip *)mem_malloc(sizeof(struct autoip));
AdamGreen	0:616601bde9fb	317	if(autoip == NULL) {
AdamGreen	0:616601bde9fb	318	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
AdamGreen	0:616601bde9fb	319	("autoip_start(): could not allocate autoip\n"));
AdamGreen	0:616601bde9fb	320	return ERR_MEM;
AdamGreen	0:616601bde9fb	321	}
AdamGreen	0:616601bde9fb	322	memset(autoip, 0, sizeof(struct autoip));
AdamGreen	0:616601bde9fb	323	/* store this AutoIP client in the netif */
AdamGreen	0:616601bde9fb	324	netif->autoip = autoip;
AdamGreen	0:616601bde9fb	325	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE, ("autoip_start(): allocated autoip"));
AdamGreen	0:616601bde9fb	326	} else {
AdamGreen	0:616601bde9fb	327	autoip->state = AUTOIP_STATE_OFF;
AdamGreen	0:616601bde9fb	328	autoip->ttw = 0;
AdamGreen	0:616601bde9fb	329	autoip->sent_num = 0;
AdamGreen	0:616601bde9fb	330	ip_addr_set_zero(&autoip->llipaddr);
AdamGreen	0:616601bde9fb	331	autoip->lastconflict = 0;
AdamGreen	0:616601bde9fb	332	}
AdamGreen	0:616601bde9fb	333
AdamGreen	0:616601bde9fb	334	autoip_create_addr(netif, &(autoip->llipaddr));
AdamGreen	0:616601bde9fb	335	autoip_start_probing(netif);
AdamGreen	0:616601bde9fb	336
AdamGreen	0:616601bde9fb	337	return result;
AdamGreen	0:616601bde9fb	338	}
AdamGreen	0:616601bde9fb	339
AdamGreen	0:616601bde9fb	340	static void
AdamGreen	0:616601bde9fb	341	autoip_start_probing(struct netif *netif)
AdamGreen	0:616601bde9fb	342	{
AdamGreen	0:616601bde9fb	343	struct autoip *autoip = netif->autoip;
AdamGreen	0:616601bde9fb	344
AdamGreen	0:616601bde9fb	345	autoip->state = AUTOIP_STATE_PROBING;
AdamGreen	0:616601bde9fb	346	autoip->sent_num = 0;
AdamGreen	0:616601bde9fb	347	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
AdamGreen	0:616601bde9fb	348	("autoip_start_probing(): changing state to PROBING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
AdamGreen	0:616601bde9fb	349	ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
AdamGreen	0:616601bde9fb	350	ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
AdamGreen	0:616601bde9fb	351
AdamGreen	0:616601bde9fb	352	/* time to wait to first probe, this is randomly
AdamGreen	0:616601bde9fb	353	* choosen out of 0 to PROBE_WAIT seconds.
AdamGreen	0:616601bde9fb	354	* compliant to RFC 3927 Section 2.2.1
AdamGreen	0:616601bde9fb	355	*/
AdamGreen	0:616601bde9fb	356	autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND));
AdamGreen	0:616601bde9fb	357
AdamGreen	0:616601bde9fb	358	/*
AdamGreen	0:616601bde9fb	359	* if we tried more then MAX_CONFLICTS we must limit our rate for
AdamGreen	0:616601bde9fb	360	* accquiring and probing address
AdamGreen	0:616601bde9fb	361	* compliant to RFC 3927 Section 2.2.1
AdamGreen	0:616601bde9fb	362	*/
AdamGreen	0:616601bde9fb	363	if(autoip->tried_llipaddr > MAX_CONFLICTS) {
AdamGreen	0:616601bde9fb	364	autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND;
AdamGreen	0:616601bde9fb	365	}
AdamGreen	0:616601bde9fb	366	}
AdamGreen	0:616601bde9fb	367
AdamGreen	0:616601bde9fb	368	/**
AdamGreen	0:616601bde9fb	369	* Handle a possible change in the network configuration.
AdamGreen	0:616601bde9fb	370	*
AdamGreen	0:616601bde9fb	371	* If there is an AutoIP address configured, take the interface down
AdamGreen	0:616601bde9fb	372	* and begin probing with the same address.
AdamGreen	0:616601bde9fb	373	*/
AdamGreen	0:616601bde9fb	374	void
AdamGreen	0:616601bde9fb	375	autoip_network_changed(struct netif *netif)
AdamGreen	0:616601bde9fb	376	{
AdamGreen	0:616601bde9fb	377	if (netif->autoip && netif->autoip->state != AUTOIP_STATE_OFF) {
AdamGreen	0:616601bde9fb	378	netif_set_down(netif);
AdamGreen	0:616601bde9fb	379	autoip_start_probing(netif);
AdamGreen	0:616601bde9fb	380	}
AdamGreen	0:616601bde9fb	381	}
AdamGreen	0:616601bde9fb	382
AdamGreen	0:616601bde9fb	383	/**
AdamGreen	0:616601bde9fb	384	* Stop AutoIP client
AdamGreen	0:616601bde9fb	385	*
AdamGreen	0:616601bde9fb	386	* @param netif network interface on which stop the AutoIP client
AdamGreen	0:616601bde9fb	387	*/
AdamGreen	0:616601bde9fb	388	err_t
AdamGreen	0:616601bde9fb	389	autoip_stop(struct netif *netif)
AdamGreen	0:616601bde9fb	390	{
AdamGreen	0:616601bde9fb	391	netif->autoip->state = AUTOIP_STATE_OFF;
AdamGreen	0:616601bde9fb	392	netif_set_down(netif);
AdamGreen	0:616601bde9fb	393	return ERR_OK;
AdamGreen	0:616601bde9fb	394	}
AdamGreen	0:616601bde9fb	395
AdamGreen	0:616601bde9fb	396	/**
AdamGreen	0:616601bde9fb	397	* Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds
AdamGreen	0:616601bde9fb	398	*/
AdamGreen	0:616601bde9fb	399	void
AdamGreen	0:616601bde9fb	400	autoip_tmr()
AdamGreen	0:616601bde9fb	401	{
AdamGreen	0:616601bde9fb	402	struct netif *netif = netif_list;
AdamGreen	0:616601bde9fb	403	/* loop through netif's */
AdamGreen	0:616601bde9fb	404	while (netif != NULL) {
AdamGreen	0:616601bde9fb	405	/* only act on AutoIP configured interfaces */
AdamGreen	0:616601bde9fb	406	if (netif->autoip != NULL) {
AdamGreen	0:616601bde9fb	407	if(netif->autoip->lastconflict > 0) {
AdamGreen	0:616601bde9fb	408	netif->autoip->lastconflict--;
AdamGreen	0:616601bde9fb	409	}
AdamGreen	0:616601bde9fb	410
AdamGreen	0:616601bde9fb	411	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
AdamGreen	0:616601bde9fb	412	("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n",
AdamGreen	0:616601bde9fb	413	(u16_t)(netif->autoip->state), netif->autoip->ttw));
AdamGreen	0:616601bde9fb	414
AdamGreen	0:616601bde9fb	415	switch(netif->autoip->state) {
AdamGreen	0:616601bde9fb	416	case AUTOIP_STATE_PROBING:
AdamGreen	0:616601bde9fb	417	if(netif->autoip->ttw > 0) {
AdamGreen	0:616601bde9fb	418	netif->autoip->ttw--;
AdamGreen	0:616601bde9fb	419	} else {
AdamGreen	0:616601bde9fb	420	if(netif->autoip->sent_num >= PROBE_NUM) {
AdamGreen	0:616601bde9fb	421	netif->autoip->state = AUTOIP_STATE_ANNOUNCING;
AdamGreen	0:616601bde9fb	422	netif->autoip->sent_num = 0;
AdamGreen	0:616601bde9fb	423	netif->autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND;
AdamGreen	0:616601bde9fb	424	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
AdamGreen	0:616601bde9fb	425	("autoip_tmr(): changing state to ANNOUNCING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
AdamGreen	0:616601bde9fb	426	ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
AdamGreen	0:616601bde9fb	427	ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
AdamGreen	0:616601bde9fb	428	} else {
AdamGreen	0:616601bde9fb	429	autoip_arp_probe(netif);
AdamGreen	0:616601bde9fb	430	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
AdamGreen	0:616601bde9fb	431	("autoip_tmr() PROBING Sent Probe\n"));
AdamGreen	0:616601bde9fb	432	netif->autoip->sent_num++;
AdamGreen	0:616601bde9fb	433	/* calculate time to wait to next probe */
AdamGreen	0:616601bde9fb	434	netif->autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) %
AdamGreen	0:616601bde9fb	435	((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) +
AdamGreen	0:616601bde9fb	436	PROBE_MIN * AUTOIP_TICKS_PER_SECOND);
AdamGreen	0:616601bde9fb	437	}
AdamGreen	0:616601bde9fb	438	}
AdamGreen	0:616601bde9fb	439	break;
AdamGreen	0:616601bde9fb	440
AdamGreen	0:616601bde9fb	441	case AUTOIP_STATE_ANNOUNCING:
AdamGreen	0:616601bde9fb	442	if(netif->autoip->ttw > 0) {
AdamGreen	0:616601bde9fb	443	netif->autoip->ttw--;
AdamGreen	0:616601bde9fb	444	} else {
AdamGreen	0:616601bde9fb	445	if(netif->autoip->sent_num == 0) {
AdamGreen	0:616601bde9fb	446	/* We are here the first time, so we waited ANNOUNCE_WAIT seconds
AdamGreen	0:616601bde9fb	447	* Now we can bind to an IP address and use it.
AdamGreen	0:616601bde9fb	448	*
AdamGreen	0:616601bde9fb	449	* autoip_bind calls netif_set_up. This triggers a gratuitous ARP
AdamGreen	0:616601bde9fb	450	* which counts as an announcement.
AdamGreen	0:616601bde9fb	451	*/
AdamGreen	0:616601bde9fb	452	autoip_bind(netif);
AdamGreen	0:616601bde9fb	453	} else {
AdamGreen	0:616601bde9fb	454	autoip_arp_announce(netif);
AdamGreen	0:616601bde9fb	455	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
AdamGreen	0:616601bde9fb	456	("autoip_tmr() ANNOUNCING Sent Announce\n"));
AdamGreen	0:616601bde9fb	457	}
AdamGreen	0:616601bde9fb	458	netif->autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND;
AdamGreen	0:616601bde9fb	459	netif->autoip->sent_num++;
AdamGreen	0:616601bde9fb	460
AdamGreen	0:616601bde9fb	461	if(netif->autoip->sent_num >= ANNOUNCE_NUM) {
AdamGreen	0:616601bde9fb	462	netif->autoip->state = AUTOIP_STATE_BOUND;
AdamGreen	0:616601bde9fb	463	netif->autoip->sent_num = 0;
AdamGreen	0:616601bde9fb	464	netif->autoip->ttw = 0;
AdamGreen	0:616601bde9fb	465	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
AdamGreen	0:616601bde9fb	466	("autoip_tmr(): changing state to BOUND: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
AdamGreen	0:616601bde9fb	467	ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
AdamGreen	0:616601bde9fb	468	ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
AdamGreen	0:616601bde9fb	469	}
AdamGreen	0:616601bde9fb	470	}
AdamGreen	0:616601bde9fb	471	break;
AdamGreen	0:616601bde9fb	472	}
AdamGreen	0:616601bde9fb	473	}
AdamGreen	0:616601bde9fb	474	/* proceed to next network interface */
AdamGreen	0:616601bde9fb	475	netif = netif->next;
AdamGreen	0:616601bde9fb	476	}
AdamGreen	0:616601bde9fb	477	}
AdamGreen	0:616601bde9fb	478
AdamGreen	0:616601bde9fb	479	/**
AdamGreen	0:616601bde9fb	480	* Handles every incoming ARP Packet, called by etharp_arp_input.
AdamGreen	0:616601bde9fb	481	*
AdamGreen	0:616601bde9fb	482	* @param netif network interface to use for autoip processing
AdamGreen	0:616601bde9fb	483	* @param hdr Incoming ARP packet
AdamGreen	0:616601bde9fb	484	*/
AdamGreen	0:616601bde9fb	485	void
AdamGreen	0:616601bde9fb	486	autoip_arp_reply(struct netif netif, struct etharp_hdr hdr)
AdamGreen	0:616601bde9fb	487	{
AdamGreen	0:616601bde9fb	488	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE, ("autoip_arp_reply()\n"));
AdamGreen	0:616601bde9fb	489	if ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) {
AdamGreen	0:616601bde9fb	490	/* when ip.src == llipaddr && hw.src != netif->hwaddr
AdamGreen	0:616601bde9fb	491	*
AdamGreen	0:616601bde9fb	492	* when probing ip.dst == llipaddr && hw.src != netif->hwaddr
AdamGreen	0:616601bde9fb	493	* we have a conflict and must solve it
AdamGreen	0:616601bde9fb	494	*/
AdamGreen	0:616601bde9fb	495	ip_addr_t sipaddr, dipaddr;
AdamGreen	0:616601bde9fb	496	struct eth_addr netifaddr;
AdamGreen	0:616601bde9fb	497	netifaddr.addr[0] = netif->hwaddr[0];
AdamGreen	0:616601bde9fb	498	netifaddr.addr[1] = netif->hwaddr[1];
AdamGreen	0:616601bde9fb	499	netifaddr.addr[2] = netif->hwaddr[2];
AdamGreen	0:616601bde9fb	500	netifaddr.addr[3] = netif->hwaddr[3];
AdamGreen	0:616601bde9fb	501	netifaddr.addr[4] = netif->hwaddr[4];
AdamGreen	0:616601bde9fb	502	netifaddr.addr[5] = netif->hwaddr[5];
AdamGreen	0:616601bde9fb	503
AdamGreen	0:616601bde9fb	504	/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
AdamGreen	0:616601bde9fb	505	* structure packing (not using structure copy which breaks strict-aliasing rules).
AdamGreen	0:616601bde9fb	506	*/
AdamGreen	0:616601bde9fb	507	IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
AdamGreen	0:616601bde9fb	508	IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
AdamGreen	0:616601bde9fb	509
AdamGreen	0:616601bde9fb	510	if ((netif->autoip->state == AUTOIP_STATE_PROBING) \|\|
AdamGreen	0:616601bde9fb	511	((netif->autoip->state == AUTOIP_STATE_ANNOUNCING) &&
AdamGreen	0:616601bde9fb	512	(netif->autoip->sent_num == 0))) {
AdamGreen	0:616601bde9fb	513	/* RFC 3927 Section 2.2.1:
AdamGreen	0:616601bde9fb	514	* from beginning to after ANNOUNCE_WAIT
AdamGreen	0:616601bde9fb	515	* seconds we have a conflict if
AdamGreen	0:616601bde9fb	516	* ip.src == llipaddr OR
AdamGreen	0:616601bde9fb	517	* ip.dst == llipaddr && hw.src != own hwaddr
AdamGreen	0:616601bde9fb	518	*/
AdamGreen	0:616601bde9fb	519	if ((ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr)) \|\|
AdamGreen	0:616601bde9fb	520	(ip_addr_cmp(&dipaddr, &netif->autoip->llipaddr) &&
AdamGreen	0:616601bde9fb	521	!eth_addr_cmp(&netifaddr, &hdr->shwaddr))) {
AdamGreen	0:616601bde9fb	522	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| LWIP_DBG_LEVEL_WARNING,
AdamGreen	0:616601bde9fb	523	("autoip_arp_reply(): Probe Conflict detected\n"));
AdamGreen	0:616601bde9fb	524	autoip_restart(netif);
AdamGreen	0:616601bde9fb	525	}
AdamGreen	0:616601bde9fb	526	} else {
AdamGreen	0:616601bde9fb	527	/* RFC 3927 Section 2.5:
AdamGreen	0:616601bde9fb	528	* in any state we have a conflict if
AdamGreen	0:616601bde9fb	529	* ip.src == llipaddr && hw.src != own hwaddr
AdamGreen	0:616601bde9fb	530	*/
AdamGreen	0:616601bde9fb	531	if (ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr) &&
AdamGreen	0:616601bde9fb	532	!eth_addr_cmp(&netifaddr, &hdr->shwaddr)) {
AdamGreen	0:616601bde9fb	533	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| LWIP_DBG_LEVEL_WARNING,
AdamGreen	0:616601bde9fb	534	("autoip_arp_reply(): Conflicting ARP-Packet detected\n"));
AdamGreen	0:616601bde9fb	535	autoip_handle_arp_conflict(netif);
AdamGreen	0:616601bde9fb	536	}
AdamGreen	0:616601bde9fb	537	}
AdamGreen	0:616601bde9fb	538	}
AdamGreen	0:616601bde9fb	539	}
AdamGreen	0:616601bde9fb	540
AdamGreen	0:616601bde9fb	541	#endif /* LWIP_AUTOIP */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	23 Feb 2012
Imports:	113
Forks:	0
Commits:	2
Dependents:	0
Dependencies:	4
Followers:	6

NetStack/lwip/core/ipv4/autoip.c@0:616601bde9fb, 2012-02-23 (annotated)

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