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I have a problem getting this to work. Server only recieves half of the data being sent. Whats wrong

lwip/core/ipv4/autoip.c@0:66300c77c6e9, 2011-03-29 (annotated)

Committer:: tax
Date:: Tue Mar 29 13:20:15 2011 +0000
Revision:: 0:66300c77c6e9

Who changed what in which revision?

User	Revision	Line number	New contents of line
tax	0:66300c77c6e9	1	/**
tax	0:66300c77c6e9	2	* @file
tax	0:66300c77c6e9	3	* AutoIP Automatic LinkLocal IP Configuration
tax	0:66300c77c6e9	4	*
tax	0:66300c77c6e9	5	*/
tax	0:66300c77c6e9	6
tax	0:66300c77c6e9	7	/*
tax	0:66300c77c6e9	8	*
tax	0:66300c77c6e9	9	* Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
tax	0:66300c77c6e9	10	* All rights reserved.
tax	0:66300c77c6e9	11	*
tax	0:66300c77c6e9	12	* Redistribution and use in source and binary forms, with or without modification,
tax	0:66300c77c6e9	13	* are permitted provided that the following conditions are met:
tax	0:66300c77c6e9	14	*
tax	0:66300c77c6e9	15	* 1. Redistributions of source code must retain the above copyright notice,
tax	0:66300c77c6e9	16	* this list of conditions and the following disclaimer.
tax	0:66300c77c6e9	17	* 2. Redistributions in binary form must reproduce the above copyright notice,
tax	0:66300c77c6e9	18	* this list of conditions and the following disclaimer in the documentation
tax	0:66300c77c6e9	19	* and/or other materials provided with the distribution.
tax	0:66300c77c6e9	20	* 3. The name of the author may not be used to endorse or promote products
tax	0:66300c77c6e9	21	* derived from this software without specific prior written permission.
tax	0:66300c77c6e9	22	*
tax	0:66300c77c6e9	23	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
tax	0:66300c77c6e9	24	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
tax	0:66300c77c6e9	25	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
tax	0:66300c77c6e9	26	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
tax	0:66300c77c6e9	27	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
tax	0:66300c77c6e9	28	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
tax	0:66300c77c6e9	29	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
tax	0:66300c77c6e9	30	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
tax	0:66300c77c6e9	31	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
tax	0:66300c77c6e9	32	* OF SUCH DAMAGE.
tax	0:66300c77c6e9	33	*
tax	0:66300c77c6e9	34	* Author: Dominik Spies <kontakt@dspies.de>
tax	0:66300c77c6e9	35	*
tax	0:66300c77c6e9	36	* This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
tax	0:66300c77c6e9	37	* with RFC 3927.
tax	0:66300c77c6e9	38	*
tax	0:66300c77c6e9	39	*
tax	0:66300c77c6e9	40	* Please coordinate changes and requests with Dominik Spies
tax	0:66300c77c6e9	41	* <kontakt@dspies.de>
tax	0:66300c77c6e9	42	*/
tax	0:66300c77c6e9	43
tax	0:66300c77c6e9	44	/*******************************************************************************
tax	0:66300c77c6e9	45	* USAGE:
tax	0:66300c77c6e9	46	*
tax	0:66300c77c6e9	47	* define LWIP_AUTOIP 1 in your lwipopts.h
tax	0:66300c77c6e9	48	*
tax	0:66300c77c6e9	49	* If you don't use tcpip.c (so, don't call, you don't call tcpip_init):
tax	0:66300c77c6e9	50	* - First, call autoip_init().
tax	0:66300c77c6e9	51	* - call autoip_tmr() all AUTOIP_TMR_INTERVAL msces,
tax	0:66300c77c6e9	52	* that should be defined in autoip.h.
tax	0:66300c77c6e9	53	* I recommend a value of 100. The value must divide 1000 with a remainder almost 0.
tax	0:66300c77c6e9	54	* Possible values are 1000, 500, 333, 250, 200, 166, 142, 125, 111, 100 ....
tax	0:66300c77c6e9	55	*
tax	0:66300c77c6e9	56	* Without DHCP:
tax	0:66300c77c6e9	57	* - Call autoip_start() after netif_add().
tax	0:66300c77c6e9	58	*
tax	0:66300c77c6e9	59	* With DHCP:
tax	0:66300c77c6e9	60	* - define LWIP_DHCP_AUTOIP_COOP 1 in your lwipopts.h.
tax	0:66300c77c6e9	61	* - Configure your DHCP Client.
tax	0:66300c77c6e9	62	*
tax	0:66300c77c6e9	63	*/
tax	0:66300c77c6e9	64
tax	0:66300c77c6e9	65	#include "lwip/opt.h"
tax	0:66300c77c6e9	66
tax	0:66300c77c6e9	67	#if LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */
tax	0:66300c77c6e9	68
tax	0:66300c77c6e9	69	#include "lwip/mem.h"
tax	0:66300c77c6e9	70	#include "lwip/udp.h"
tax	0:66300c77c6e9	71	#include "lwip/ip_addr.h"
tax	0:66300c77c6e9	72	#include "lwip/netif.h"
tax	0:66300c77c6e9	73	#include "lwip/autoip.h"
tax	0:66300c77c6e9	74	#include "netif/etharp.h"
tax	0:66300c77c6e9	75
tax	0:66300c77c6e9	76	#include <stdlib.h>
tax	0:66300c77c6e9	77	#include <string.h>
tax	0:66300c77c6e9	78
tax	0:66300c77c6e9	79	/* 169.254.0.0 */
tax	0:66300c77c6e9	80	#define AUTOIP_NET 0xA9FE0000
tax	0:66300c77c6e9	81	/* 169.254.1.0 */
tax	0:66300c77c6e9	82	#define AUTOIP_RANGE_START (AUTOIP_NET \| 0x0100)
tax	0:66300c77c6e9	83	/* 169.254.254.255 */
tax	0:66300c77c6e9	84	#define AUTOIP_RANGE_END (AUTOIP_NET \| 0xFEFF)
tax	0:66300c77c6e9	85
tax	0:66300c77c6e9	86
tax	0:66300c77c6e9	87	/** Pseudo random macro based on netif informations.
tax	0:66300c77c6e9	88	* You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */
tax	0:66300c77c6e9	89	#ifndef LWIP_AUTOIP_RAND
tax	0:66300c77c6e9	90	#define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) \| \
tax	0:66300c77c6e9	91	((u32_t)((netif->hwaddr[3]) & 0xff) << 16) \| \
tax	0:66300c77c6e9	92	((u32_t)((netif->hwaddr[2]) & 0xff) << 8) \| \
tax	0:66300c77c6e9	93	((u32_t)((netif->hwaddr[4]) & 0xff))) + \
tax	0:66300c77c6e9	94	(netif->autoip?netif->autoip->tried_llipaddr:0))
tax	0:66300c77c6e9	95	#endif /* LWIP_AUTOIP_RAND */
tax	0:66300c77c6e9	96
tax	0:66300c77c6e9	97	/**
tax	0:66300c77c6e9	98	* Macro that generates the initial IP address to be tried by AUTOIP.
tax	0:66300c77c6e9	99	* If you want to override this, define it to something else in lwipopts.h.
tax	0:66300c77c6e9	100	*/
tax	0:66300c77c6e9	101	#ifndef LWIP_AUTOIP_CREATE_SEED_ADDR
tax	0:66300c77c6e9	102	#define LWIP_AUTOIP_CREATE_SEED_ADDR(netif) \
tax	0:66300c77c6e9	103	htonl(AUTOIP_RANGE_START + ((u32_t)(((u8_t)(netif->hwaddr[4])) \| \
tax	0:66300c77c6e9	104	((u32_t)((u8_t)(netif->hwaddr[5]))) << 8)))
tax	0:66300c77c6e9	105	#endif /* LWIP_AUTOIP_CREATE_SEED_ADDR */
tax	0:66300c77c6e9	106
tax	0:66300c77c6e9	107	/* static functions */
tax	0:66300c77c6e9	108	static void autoip_handle_arp_conflict(struct netif *netif);
tax	0:66300c77c6e9	109
tax	0:66300c77c6e9	110	/* creates a pseudo random LL IP-Address for a network interface */
tax	0:66300c77c6e9	111	static void autoip_create_addr(struct netif netif, ip_addr_t ipaddr);
tax	0:66300c77c6e9	112
tax	0:66300c77c6e9	113	/* sends an ARP probe */
tax	0:66300c77c6e9	114	static err_t autoip_arp_probe(struct netif *netif);
tax	0:66300c77c6e9	115
tax	0:66300c77c6e9	116	/* sends an ARP announce */
tax	0:66300c77c6e9	117	static err_t autoip_arp_announce(struct netif *netif);
tax	0:66300c77c6e9	118
tax	0:66300c77c6e9	119	/* configure interface for use with current LL IP-Address */
tax	0:66300c77c6e9	120	static err_t autoip_bind(struct netif *netif);
tax	0:66300c77c6e9	121
tax	0:66300c77c6e9	122	/* start sending probes for llipaddr */
tax	0:66300c77c6e9	123	static void autoip_start_probing(struct netif *netif);
tax	0:66300c77c6e9	124
tax	0:66300c77c6e9	125	/**
tax	0:66300c77c6e9	126	* Initialize this module
tax	0:66300c77c6e9	127	*/
tax	0:66300c77c6e9	128	void
tax	0:66300c77c6e9	129	autoip_init(void)
tax	0:66300c77c6e9	130	{
tax	0:66300c77c6e9	131	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE, ("autoip_init()\n"));
tax	0:66300c77c6e9	132	}
tax	0:66300c77c6e9	133
tax	0:66300c77c6e9	134	/** Set a statically allocated struct autoip to work with.
tax	0:66300c77c6e9	135	* Using this prevents autoip_start to allocate it using mem_malloc.
tax	0:66300c77c6e9	136	*
tax	0:66300c77c6e9	137	* @param netif the netif for which to set the struct autoip
tax	0:66300c77c6e9	138	* @param dhcp (uninitialised) dhcp struct allocated by the application
tax	0:66300c77c6e9	139	*/
tax	0:66300c77c6e9	140	void
tax	0:66300c77c6e9	141	autoip_set_struct(struct netif netif, struct autoip autoip)
tax	0:66300c77c6e9	142	{
tax	0:66300c77c6e9	143	LWIP_ASSERT("netif != NULL", netif != NULL);
tax	0:66300c77c6e9	144	LWIP_ASSERT("autoip != NULL", autoip != NULL);
tax	0:66300c77c6e9	145	LWIP_ASSERT("netif already has a struct autoip set", netif->autoip == NULL);
tax	0:66300c77c6e9	146
tax	0:66300c77c6e9	147	/* clear data structure */
tax	0:66300c77c6e9	148	memset(autoip, 0, sizeof(struct autoip));
tax	0:66300c77c6e9	149	/* autoip->state = AUTOIP_STATE_OFF; */
tax	0:66300c77c6e9	150	netif->autoip = autoip;
tax	0:66300c77c6e9	151	}
tax	0:66300c77c6e9	152
tax	0:66300c77c6e9	153	/** Restart AutoIP client and check the next address (conflict detected)
tax	0:66300c77c6e9	154	*
tax	0:66300c77c6e9	155	* @param netif The netif under AutoIP control
tax	0:66300c77c6e9	156	*/
tax	0:66300c77c6e9	157	static void
tax	0:66300c77c6e9	158	autoip_restart(struct netif *netif)
tax	0:66300c77c6e9	159	{
tax	0:66300c77c6e9	160	netif->autoip->tried_llipaddr++;
tax	0:66300c77c6e9	161	autoip_start(netif);
tax	0:66300c77c6e9	162	}
tax	0:66300c77c6e9	163
tax	0:66300c77c6e9	164	/**
tax	0:66300c77c6e9	165	* Handle a IP address conflict after an ARP conflict detection
tax	0:66300c77c6e9	166	*/
tax	0:66300c77c6e9	167	static void
tax	0:66300c77c6e9	168	autoip_handle_arp_conflict(struct netif *netif)
tax	0:66300c77c6e9	169	{
tax	0:66300c77c6e9	170	/* Somehow detect if we are defending or retreating */
tax	0:66300c77c6e9	171	unsigned char defend = 1; /* tbd */
tax	0:66300c77c6e9	172
tax	0:66300c77c6e9	173	if(defend) {
tax	0:66300c77c6e9	174	if(netif->autoip->lastconflict > 0) {
tax	0:66300c77c6e9	175	/* retreat, there was a conflicting ARP in the last
tax	0:66300c77c6e9	176	* DEFEND_INTERVAL seconds
tax	0:66300c77c6e9	177	*/
tax	0:66300c77c6e9	178	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
tax	0:66300c77c6e9	179	("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n"));
tax	0:66300c77c6e9	180
tax	0:66300c77c6e9	181	/* TODO: close all TCP sessions */
tax	0:66300c77c6e9	182	autoip_restart(netif);
tax	0:66300c77c6e9	183	} else {
tax	0:66300c77c6e9	184	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
tax	0:66300c77c6e9	185	("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n"));
tax	0:66300c77c6e9	186	autoip_arp_announce(netif);
tax	0:66300c77c6e9	187	netif->autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_TICKS_PER_SECOND;
tax	0:66300c77c6e9	188	}
tax	0:66300c77c6e9	189	} else {
tax	0:66300c77c6e9	190	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
tax	0:66300c77c6e9	191	("autoip_handle_arp_conflict(): we do not defend, retreating\n"));
tax	0:66300c77c6e9	192	/* TODO: close all TCP sessions */
tax	0:66300c77c6e9	193	autoip_restart(netif);
tax	0:66300c77c6e9	194	}
tax	0:66300c77c6e9	195	}
tax	0:66300c77c6e9	196
tax	0:66300c77c6e9	197	/**
tax	0:66300c77c6e9	198	* Create an IP-Address out of range 169.254.1.0 to 169.254.254.255
tax	0:66300c77c6e9	199	*
tax	0:66300c77c6e9	200	* @param netif network interface on which create the IP-Address
tax	0:66300c77c6e9	201	* @param ipaddr ip address to initialize
tax	0:66300c77c6e9	202	*/
tax	0:66300c77c6e9	203	static void
tax	0:66300c77c6e9	204	autoip_create_addr(struct netif netif, ip_addr_t ipaddr)
tax	0:66300c77c6e9	205	{
tax	0:66300c77c6e9	206	/* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255
tax	0:66300c77c6e9	207	* compliant to RFC 3927 Section 2.1
tax	0:66300c77c6e9	208	* We have 254 * 256 possibilities */
tax	0:66300c77c6e9	209
tax	0:66300c77c6e9	210	u32_t addr = ntohl(LWIP_AUTOIP_CREATE_SEED_ADDR(netif));
tax	0:66300c77c6e9	211	addr += netif->autoip->tried_llipaddr;
tax	0:66300c77c6e9	212	addr = AUTOIP_NET \| (addr & 0xffff);
tax	0:66300c77c6e9	213	/* Now, 169.254.0.0 <= addr <= 169.254.255.255 */
tax	0:66300c77c6e9	214
tax	0:66300c77c6e9	215	if (addr < AUTOIP_RANGE_START) {
tax	0:66300c77c6e9	216	addr += AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
tax	0:66300c77c6e9	217	}
tax	0:66300c77c6e9	218	if (addr > AUTOIP_RANGE_END) {
tax	0:66300c77c6e9	219	addr -= AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
tax	0:66300c77c6e9	220	}
tax	0:66300c77c6e9	221	LWIP_ASSERT("AUTOIP address not in range", (addr >= AUTOIP_RANGE_START) &&
tax	0:66300c77c6e9	222	(addr <= AUTOIP_RANGE_END));
tax	0:66300c77c6e9	223	ip4_addr_set_u32(ipaddr, htonl(addr));
tax	0:66300c77c6e9	224
tax	0:66300c77c6e9	225	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
tax	0:66300c77c6e9	226	("autoip_create_addr(): tried_llipaddr=%"U16_F", %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
tax	0:66300c77c6e9	227	(u16_t)(netif->autoip->tried_llipaddr), ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr),
tax	0:66300c77c6e9	228	ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
tax	0:66300c77c6e9	229	}
tax	0:66300c77c6e9	230
tax	0:66300c77c6e9	231	/**
tax	0:66300c77c6e9	232	* Sends an ARP probe from a network interface
tax	0:66300c77c6e9	233	*
tax	0:66300c77c6e9	234	* @param netif network interface used to send the probe
tax	0:66300c77c6e9	235	*/
tax	0:66300c77c6e9	236	static err_t
tax	0:66300c77c6e9	237	autoip_arp_probe(struct netif *netif)
tax	0:66300c77c6e9	238	{
tax	0:66300c77c6e9	239	return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
tax	0:66300c77c6e9	240	(struct eth_addr *)netif->hwaddr, IP_ADDR_ANY, &ethzero,
tax	0:66300c77c6e9	241	&netif->autoip->llipaddr, ARP_REQUEST);
tax	0:66300c77c6e9	242	}
tax	0:66300c77c6e9	243
tax	0:66300c77c6e9	244	/**
tax	0:66300c77c6e9	245	* Sends an ARP announce from a network interface
tax	0:66300c77c6e9	246	*
tax	0:66300c77c6e9	247	* @param netif network interface used to send the announce
tax	0:66300c77c6e9	248	*/
tax	0:66300c77c6e9	249	static err_t
tax	0:66300c77c6e9	250	autoip_arp_announce(struct netif *netif)
tax	0:66300c77c6e9	251	{
tax	0:66300c77c6e9	252	return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
tax	0:66300c77c6e9	253	(struct eth_addr *)netif->hwaddr, &netif->autoip->llipaddr, &ethzero,
tax	0:66300c77c6e9	254	&netif->autoip->llipaddr, ARP_REQUEST);
tax	0:66300c77c6e9	255	}
tax	0:66300c77c6e9	256
tax	0:66300c77c6e9	257	/**
tax	0:66300c77c6e9	258	* Configure interface for use with current LL IP-Address
tax	0:66300c77c6e9	259	*
tax	0:66300c77c6e9	260	* @param netif network interface to configure with current LL IP-Address
tax	0:66300c77c6e9	261	*/
tax	0:66300c77c6e9	262	static err_t
tax	0:66300c77c6e9	263	autoip_bind(struct netif *netif)
tax	0:66300c77c6e9	264	{
tax	0:66300c77c6e9	265	struct autoip *autoip = netif->autoip;
tax	0:66300c77c6e9	266	ip_addr_t sn_mask, gw_addr;
tax	0:66300c77c6e9	267
tax	0:66300c77c6e9	268	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
tax	0:66300c77c6e9	269	("autoip_bind(netif=%p) %c%c%"U16_F" %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
tax	0:66300c77c6e9	270	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num,
tax	0:66300c77c6e9	271	ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr),
tax	0:66300c77c6e9	272	ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr)));
tax	0:66300c77c6e9	273
tax	0:66300c77c6e9	274	IP4_ADDR(&sn_mask, 255, 255, 0, 0);
tax	0:66300c77c6e9	275	IP4_ADDR(&gw_addr, 0, 0, 0, 0);
tax	0:66300c77c6e9	276
tax	0:66300c77c6e9	277	netif_set_ipaddr(netif, &autoip->llipaddr);
tax	0:66300c77c6e9	278	netif_set_netmask(netif, &sn_mask);
tax	0:66300c77c6e9	279	netif_set_gw(netif, &gw_addr);
tax	0:66300c77c6e9	280
tax	0:66300c77c6e9	281	/* bring the interface up */
tax	0:66300c77c6e9	282	netif_set_up(netif);
tax	0:66300c77c6e9	283
tax	0:66300c77c6e9	284	return ERR_OK;
tax	0:66300c77c6e9	285	}
tax	0:66300c77c6e9	286
tax	0:66300c77c6e9	287	/**
tax	0:66300c77c6e9	288	* Start AutoIP client
tax	0:66300c77c6e9	289	*
tax	0:66300c77c6e9	290	* @param netif network interface on which start the AutoIP client
tax	0:66300c77c6e9	291	*/
tax	0:66300c77c6e9	292	err_t
tax	0:66300c77c6e9	293	autoip_start(struct netif *netif)
tax	0:66300c77c6e9	294	{
tax	0:66300c77c6e9	295	struct autoip *autoip = netif->autoip;
tax	0:66300c77c6e9	296	err_t result = ERR_OK;
tax	0:66300c77c6e9	297
tax	0:66300c77c6e9	298	if(netif_is_up(netif)) {
tax	0:66300c77c6e9	299	netif_set_down(netif);
tax	0:66300c77c6e9	300	}
tax	0:66300c77c6e9	301
tax	0:66300c77c6e9	302	/* Set IP-Address, Netmask and Gateway to 0 to make sure that
tax	0:66300c77c6e9	303	* ARP Packets are formed correctly
tax	0:66300c77c6e9	304	*/
tax	0:66300c77c6e9	305	ip_addr_set_zero(&netif->ip_addr);
tax	0:66300c77c6e9	306	ip_addr_set_zero(&netif->netmask);
tax	0:66300c77c6e9	307	ip_addr_set_zero(&netif->gw);
tax	0:66300c77c6e9	308
tax	0:66300c77c6e9	309	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
tax	0:66300c77c6e9	310	("autoip_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0],
tax	0:66300c77c6e9	311	netif->name[1], (u16_t)netif->num));
tax	0:66300c77c6e9	312	if(autoip == NULL) {
tax	0:66300c77c6e9	313	/* no AutoIP client attached yet? */
tax	0:66300c77c6e9	314	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
tax	0:66300c77c6e9	315	("autoip_start(): starting new AUTOIP client\n"));
tax	0:66300c77c6e9	316	autoip = (struct autoip *)mem_malloc(sizeof(struct autoip));
tax	0:66300c77c6e9	317	if(autoip == NULL) {
tax	0:66300c77c6e9	318	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
tax	0:66300c77c6e9	319	("autoip_start(): could not allocate autoip\n"));
tax	0:66300c77c6e9	320	return ERR_MEM;
tax	0:66300c77c6e9	321	}
tax	0:66300c77c6e9	322	memset(autoip, 0, sizeof(struct autoip));
tax	0:66300c77c6e9	323	/* store this AutoIP client in the netif */
tax	0:66300c77c6e9	324	netif->autoip = autoip;
tax	0:66300c77c6e9	325	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE, ("autoip_start(): allocated autoip"));
tax	0:66300c77c6e9	326	} else {
tax	0:66300c77c6e9	327	autoip->state = AUTOIP_STATE_OFF;
tax	0:66300c77c6e9	328	autoip->ttw = 0;
tax	0:66300c77c6e9	329	autoip->sent_num = 0;
tax	0:66300c77c6e9	330	ip_addr_set_zero(&autoip->llipaddr);
tax	0:66300c77c6e9	331	autoip->lastconflict = 0;
tax	0:66300c77c6e9	332	}
tax	0:66300c77c6e9	333
tax	0:66300c77c6e9	334	autoip_create_addr(netif, &(autoip->llipaddr));
tax	0:66300c77c6e9	335	autoip_start_probing(netif);
tax	0:66300c77c6e9	336
tax	0:66300c77c6e9	337	return result;
tax	0:66300c77c6e9	338	}
tax	0:66300c77c6e9	339
tax	0:66300c77c6e9	340	static void
tax	0:66300c77c6e9	341	autoip_start_probing(struct netif *netif)
tax	0:66300c77c6e9	342	{
tax	0:66300c77c6e9	343	struct autoip *autoip = netif->autoip;
tax	0:66300c77c6e9	344
tax	0:66300c77c6e9	345	autoip->state = AUTOIP_STATE_PROBING;
tax	0:66300c77c6e9	346	autoip->sent_num = 0;
tax	0:66300c77c6e9	347	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
tax	0:66300c77c6e9	348	("autoip_start_probing(): changing state to PROBING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
tax	0:66300c77c6e9	349	ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
tax	0:66300c77c6e9	350	ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
tax	0:66300c77c6e9	351
tax	0:66300c77c6e9	352	/* time to wait to first probe, this is randomly
tax	0:66300c77c6e9	353	* choosen out of 0 to PROBE_WAIT seconds.
tax	0:66300c77c6e9	354	* compliant to RFC 3927 Section 2.2.1
tax	0:66300c77c6e9	355	*/
tax	0:66300c77c6e9	356	autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND));
tax	0:66300c77c6e9	357
tax	0:66300c77c6e9	358	/*
tax	0:66300c77c6e9	359	* if we tried more then MAX_CONFLICTS we must limit our rate for
tax	0:66300c77c6e9	360	* accquiring and probing address
tax	0:66300c77c6e9	361	* compliant to RFC 3927 Section 2.2.1
tax	0:66300c77c6e9	362	*/
tax	0:66300c77c6e9	363	if(autoip->tried_llipaddr > MAX_CONFLICTS) {
tax	0:66300c77c6e9	364	autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND;
tax	0:66300c77c6e9	365	}
tax	0:66300c77c6e9	366	}
tax	0:66300c77c6e9	367
tax	0:66300c77c6e9	368	/**
tax	0:66300c77c6e9	369	* Handle a possible change in the network configuration.
tax	0:66300c77c6e9	370	*
tax	0:66300c77c6e9	371	* If there is an AutoIP address configured, take the interface down
tax	0:66300c77c6e9	372	* and begin probing with the same address.
tax	0:66300c77c6e9	373	*/
tax	0:66300c77c6e9	374	void
tax	0:66300c77c6e9	375	autoip_network_changed(struct netif *netif)
tax	0:66300c77c6e9	376	{
tax	0:66300c77c6e9	377	if (netif->autoip && netif->autoip->state != AUTOIP_STATE_OFF) {
tax	0:66300c77c6e9	378	netif_set_down(netif);
tax	0:66300c77c6e9	379	autoip_start_probing(netif);
tax	0:66300c77c6e9	380	}
tax	0:66300c77c6e9	381	}
tax	0:66300c77c6e9	382
tax	0:66300c77c6e9	383	/**
tax	0:66300c77c6e9	384	* Stop AutoIP client
tax	0:66300c77c6e9	385	*
tax	0:66300c77c6e9	386	* @param netif network interface on which stop the AutoIP client
tax	0:66300c77c6e9	387	*/
tax	0:66300c77c6e9	388	err_t
tax	0:66300c77c6e9	389	autoip_stop(struct netif *netif)
tax	0:66300c77c6e9	390	{
tax	0:66300c77c6e9	391	netif->autoip->state = AUTOIP_STATE_OFF;
tax	0:66300c77c6e9	392	netif_set_down(netif);
tax	0:66300c77c6e9	393	return ERR_OK;
tax	0:66300c77c6e9	394	}
tax	0:66300c77c6e9	395
tax	0:66300c77c6e9	396	/**
tax	0:66300c77c6e9	397	* Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds
tax	0:66300c77c6e9	398	*/
tax	0:66300c77c6e9	399	void
tax	0:66300c77c6e9	400	autoip_tmr()
tax	0:66300c77c6e9	401	{
tax	0:66300c77c6e9	402	struct netif *netif = netif_list;
tax	0:66300c77c6e9	403	/* loop through netif's */
tax	0:66300c77c6e9	404	while (netif != NULL) {
tax	0:66300c77c6e9	405	/* only act on AutoIP configured interfaces */
tax	0:66300c77c6e9	406	if (netif->autoip != NULL) {
tax	0:66300c77c6e9	407	if(netif->autoip->lastconflict > 0) {
tax	0:66300c77c6e9	408	netif->autoip->lastconflict--;
tax	0:66300c77c6e9	409	}
tax	0:66300c77c6e9	410
tax	0:66300c77c6e9	411	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
tax	0:66300c77c6e9	412	("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n",
tax	0:66300c77c6e9	413	(u16_t)(netif->autoip->state), netif->autoip->ttw));
tax	0:66300c77c6e9	414
tax	0:66300c77c6e9	415	switch(netif->autoip->state) {
tax	0:66300c77c6e9	416	case AUTOIP_STATE_PROBING:
tax	0:66300c77c6e9	417	if(netif->autoip->ttw > 0) {
tax	0:66300c77c6e9	418	netif->autoip->ttw--;
tax	0:66300c77c6e9	419	} else {
tax	0:66300c77c6e9	420	if(netif->autoip->sent_num >= PROBE_NUM) {
tax	0:66300c77c6e9	421	netif->autoip->state = AUTOIP_STATE_ANNOUNCING;
tax	0:66300c77c6e9	422	netif->autoip->sent_num = 0;
tax	0:66300c77c6e9	423	netif->autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND;
tax	0:66300c77c6e9	424	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
tax	0:66300c77c6e9	425	("autoip_tmr(): changing state to ANNOUNCING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
tax	0:66300c77c6e9	426	ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
tax	0:66300c77c6e9	427	ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
tax	0:66300c77c6e9	428	} else {
tax	0:66300c77c6e9	429	autoip_arp_probe(netif);
tax	0:66300c77c6e9	430	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
tax	0:66300c77c6e9	431	("autoip_tmr() PROBING Sent Probe\n"));
tax	0:66300c77c6e9	432	netif->autoip->sent_num++;
tax	0:66300c77c6e9	433	/* calculate time to wait to next probe */
tax	0:66300c77c6e9	434	netif->autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) %
tax	0:66300c77c6e9	435	((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) +
tax	0:66300c77c6e9	436	PROBE_MIN * AUTOIP_TICKS_PER_SECOND);
tax	0:66300c77c6e9	437	}
tax	0:66300c77c6e9	438	}
tax	0:66300c77c6e9	439	break;
tax	0:66300c77c6e9	440
tax	0:66300c77c6e9	441	case AUTOIP_STATE_ANNOUNCING:
tax	0:66300c77c6e9	442	if(netif->autoip->ttw > 0) {
tax	0:66300c77c6e9	443	netif->autoip->ttw--;
tax	0:66300c77c6e9	444	} else {
tax	0:66300c77c6e9	445	if(netif->autoip->sent_num == 0) {
tax	0:66300c77c6e9	446	/* We are here the first time, so we waited ANNOUNCE_WAIT seconds
tax	0:66300c77c6e9	447	* Now we can bind to an IP address and use it.
tax	0:66300c77c6e9	448	*
tax	0:66300c77c6e9	449	* autoip_bind calls netif_set_up. This triggers a gratuitous ARP
tax	0:66300c77c6e9	450	* which counts as an announcement.
tax	0:66300c77c6e9	451	*/
tax	0:66300c77c6e9	452	autoip_bind(netif);
tax	0:66300c77c6e9	453	} else {
tax	0:66300c77c6e9	454	autoip_arp_announce(netif);
tax	0:66300c77c6e9	455	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,
tax	0:66300c77c6e9	456	("autoip_tmr() ANNOUNCING Sent Announce\n"));
tax	0:66300c77c6e9	457	}
tax	0:66300c77c6e9	458	netif->autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND;
tax	0:66300c77c6e9	459	netif->autoip->sent_num++;
tax	0:66300c77c6e9	460
tax	0:66300c77c6e9	461	if(netif->autoip->sent_num >= ANNOUNCE_NUM) {
tax	0:66300c77c6e9	462	netif->autoip->state = AUTOIP_STATE_BOUND;
tax	0:66300c77c6e9	463	netif->autoip->sent_num = 0;
tax	0:66300c77c6e9	464	netif->autoip->ttw = 0;
tax	0:66300c77c6e9	465	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
tax	0:66300c77c6e9	466	("autoip_tmr(): changing state to BOUND: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
tax	0:66300c77c6e9	467	ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
tax	0:66300c77c6e9	468	ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
tax	0:66300c77c6e9	469	}
tax	0:66300c77c6e9	470	}
tax	0:66300c77c6e9	471	break;
tax	0:66300c77c6e9	472	}
tax	0:66300c77c6e9	473	}
tax	0:66300c77c6e9	474	/* proceed to next network interface */
tax	0:66300c77c6e9	475	netif = netif->next;
tax	0:66300c77c6e9	476	}
tax	0:66300c77c6e9	477	}
tax	0:66300c77c6e9	478
tax	0:66300c77c6e9	479	/**
tax	0:66300c77c6e9	480	* Handles every incoming ARP Packet, called by etharp_arp_input.
tax	0:66300c77c6e9	481	*
tax	0:66300c77c6e9	482	* @param netif network interface to use for autoip processing
tax	0:66300c77c6e9	483	* @param hdr Incoming ARP packet
tax	0:66300c77c6e9	484	*/
tax	0:66300c77c6e9	485	void
tax	0:66300c77c6e9	486	autoip_arp_reply(struct netif netif, struct etharp_hdr hdr)
tax	0:66300c77c6e9	487	{
tax	0:66300c77c6e9	488	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE, ("autoip_arp_reply()\n"));
tax	0:66300c77c6e9	489	if ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) {
tax	0:66300c77c6e9	490	/* when ip.src == llipaddr && hw.src != netif->hwaddr
tax	0:66300c77c6e9	491	*
tax	0:66300c77c6e9	492	* when probing ip.dst == llipaddr && hw.src != netif->hwaddr
tax	0:66300c77c6e9	493	* we have a conflict and must solve it
tax	0:66300c77c6e9	494	*/
tax	0:66300c77c6e9	495	ip_addr_t sipaddr, dipaddr;
tax	0:66300c77c6e9	496	struct eth_addr netifaddr;
tax	0:66300c77c6e9	497	netifaddr.addr[0] = netif->hwaddr[0];
tax	0:66300c77c6e9	498	netifaddr.addr[1] = netif->hwaddr[1];
tax	0:66300c77c6e9	499	netifaddr.addr[2] = netif->hwaddr[2];
tax	0:66300c77c6e9	500	netifaddr.addr[3] = netif->hwaddr[3];
tax	0:66300c77c6e9	501	netifaddr.addr[4] = netif->hwaddr[4];
tax	0:66300c77c6e9	502	netifaddr.addr[5] = netif->hwaddr[5];
tax	0:66300c77c6e9	503
tax	0:66300c77c6e9	504	/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
tax	0:66300c77c6e9	505	* structure packing (not using structure copy which breaks strict-aliasing rules).
tax	0:66300c77c6e9	506	*/
tax	0:66300c77c6e9	507	IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
tax	0:66300c77c6e9	508	IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
tax	0:66300c77c6e9	509
tax	0:66300c77c6e9	510	if ((netif->autoip->state == AUTOIP_STATE_PROBING) \|\|
tax	0:66300c77c6e9	511	((netif->autoip->state == AUTOIP_STATE_ANNOUNCING) &&
tax	0:66300c77c6e9	512	(netif->autoip->sent_num == 0))) {
tax	0:66300c77c6e9	513	/* RFC 3927 Section 2.2.1:
tax	0:66300c77c6e9	514	* from beginning to after ANNOUNCE_WAIT
tax	0:66300c77c6e9	515	* seconds we have a conflict if
tax	0:66300c77c6e9	516	* ip.src == llipaddr OR
tax	0:66300c77c6e9	517	* ip.dst == llipaddr && hw.src != own hwaddr
tax	0:66300c77c6e9	518	*/
tax	0:66300c77c6e9	519	if ((ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr)) \|\|
tax	0:66300c77c6e9	520	(ip_addr_cmp(&dipaddr, &netif->autoip->llipaddr) &&
tax	0:66300c77c6e9	521	!eth_addr_cmp(&netifaddr, &hdr->shwaddr))) {
tax	0:66300c77c6e9	522	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| LWIP_DBG_LEVEL_WARNING,
tax	0:66300c77c6e9	523	("autoip_arp_reply(): Probe Conflict detected\n"));
tax	0:66300c77c6e9	524	autoip_restart(netif);
tax	0:66300c77c6e9	525	}
tax	0:66300c77c6e9	526	} else {
tax	0:66300c77c6e9	527	/* RFC 3927 Section 2.5:
tax	0:66300c77c6e9	528	* in any state we have a conflict if
tax	0:66300c77c6e9	529	* ip.src == llipaddr && hw.src != own hwaddr
tax	0:66300c77c6e9	530	*/
tax	0:66300c77c6e9	531	if (ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr) &&
tax	0:66300c77c6e9	532	!eth_addr_cmp(&netifaddr, &hdr->shwaddr)) {
tax	0:66300c77c6e9	533	LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| LWIP_DBG_LEVEL_WARNING,
tax	0:66300c77c6e9	534	("autoip_arp_reply(): Conflicting ARP-Packet detected\n"));
tax	0:66300c77c6e9	535	autoip_handle_arp_conflict(netif);
tax	0:66300c77c6e9	536	}
tax	0:66300c77c6e9	537	}
tax	0:66300c77c6e9	538	}
tax	0:66300c77c6e9	539	}
tax	0:66300c77c6e9	540
tax	0:66300c77c6e9	541	#endif /* LWIP_AUTOIP */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	29 Mar 2011
Imports:	16
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	2

lwip/core/ipv4/autoip.c@0:66300c77c6e9, 2011-03-29 (annotated)

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