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NetServices/lwip/core/ipv4/autoip.c@0:05ccbd4f84f1, 2013-12-02 (annotated)

Committer:
hendrikvincent
Date:
Mon Dec 02 09:01:23 2013 +0000
Revision:
0:05ccbd4f84f1
eerste programma;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hendrikvincent 0:05ccbd4f84f1 1 /**
hendrikvincent 0:05ccbd4f84f1 2 * @file
hendrikvincent 0:05ccbd4f84f1 3 * AutoIP Automatic LinkLocal IP Configuration
hendrikvincent 0:05ccbd4f84f1 4 *
hendrikvincent 0:05ccbd4f84f1 5 */
hendrikvincent 0:05ccbd4f84f1 6
hendrikvincent 0:05ccbd4f84f1 7 /*
hendrikvincent 0:05ccbd4f84f1 8 *
hendrikvincent 0:05ccbd4f84f1 9 * Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
hendrikvincent 0:05ccbd4f84f1 10 * All rights reserved.
hendrikvincent 0:05ccbd4f84f1 11 *
hendrikvincent 0:05ccbd4f84f1 12 * Redistribution and use in source and binary forms, with or without modification,
hendrikvincent 0:05ccbd4f84f1 13 * are permitted provided that the following conditions are met:
hendrikvincent 0:05ccbd4f84f1 14 *
hendrikvincent 0:05ccbd4f84f1 15 * 1. Redistributions of source code must retain the above copyright notice,
hendrikvincent 0:05ccbd4f84f1 16 * this list of conditions and the following disclaimer.
hendrikvincent 0:05ccbd4f84f1 17 * 2. Redistributions in binary form must reproduce the above copyright notice,
hendrikvincent 0:05ccbd4f84f1 18 * this list of conditions and the following disclaimer in the documentation
hendrikvincent 0:05ccbd4f84f1 19 * and/or other materials provided with the distribution.
hendrikvincent 0:05ccbd4f84f1 20 * 3. The name of the author may not be used to endorse or promote products
hendrikvincent 0:05ccbd4f84f1 21 * derived from this software without specific prior written permission.
hendrikvincent 0:05ccbd4f84f1 22 *
hendrikvincent 0:05ccbd4f84f1 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
hendrikvincent 0:05ccbd4f84f1 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
hendrikvincent 0:05ccbd4f84f1 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
hendrikvincent 0:05ccbd4f84f1 26 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
hendrikvincent 0:05ccbd4f84f1 27 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
hendrikvincent 0:05ccbd4f84f1 28 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
hendrikvincent 0:05ccbd4f84f1 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
hendrikvincent 0:05ccbd4f84f1 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
hendrikvincent 0:05ccbd4f84f1 31 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
hendrikvincent 0:05ccbd4f84f1 32 * OF SUCH DAMAGE.
hendrikvincent 0:05ccbd4f84f1 33 *
hendrikvincent 0:05ccbd4f84f1 34 * Author: Dominik Spies <kontakt@dspies.de>
hendrikvincent 0:05ccbd4f84f1 35 *
hendrikvincent 0:05ccbd4f84f1 36 * This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
hendrikvincent 0:05ccbd4f84f1 37 * with RFC 3927.
hendrikvincent 0:05ccbd4f84f1 38 *
hendrikvincent 0:05ccbd4f84f1 39 *
hendrikvincent 0:05ccbd4f84f1 40 * Please coordinate changes and requests with Dominik Spies
hendrikvincent 0:05ccbd4f84f1 41 * <kontakt@dspies.de>
hendrikvincent 0:05ccbd4f84f1 42 */
hendrikvincent 0:05ccbd4f84f1 43
hendrikvincent 0:05ccbd4f84f1 44 /*******************************************************************************
hendrikvincent 0:05ccbd4f84f1 45 * USAGE:
hendrikvincent 0:05ccbd4f84f1 46 *
hendrikvincent 0:05ccbd4f84f1 47 * define LWIP_AUTOIP 1 in your lwipopts.h
hendrikvincent 0:05ccbd4f84f1 48 *
hendrikvincent 0:05ccbd4f84f1 49 * If you don't use tcpip.c (so, don't call, you don't call tcpip_init):
hendrikvincent 0:05ccbd4f84f1 50 * - First, call autoip_init().
hendrikvincent 0:05ccbd4f84f1 51 * - call autoip_tmr() all AUTOIP_TMR_INTERVAL msces,
hendrikvincent 0:05ccbd4f84f1 52 * that should be defined in autoip.h.
hendrikvincent 0:05ccbd4f84f1 53 * I recommend a value of 100. The value must divide 1000 with a remainder almost 0.
hendrikvincent 0:05ccbd4f84f1 54 * Possible values are 1000, 500, 333, 250, 200, 166, 142, 125, 111, 100 ....
hendrikvincent 0:05ccbd4f84f1 55 *
hendrikvincent 0:05ccbd4f84f1 56 * Without DHCP:
hendrikvincent 0:05ccbd4f84f1 57 * - Call autoip_start() after netif_add().
hendrikvincent 0:05ccbd4f84f1 58 *
hendrikvincent 0:05ccbd4f84f1 59 * With DHCP:
hendrikvincent 0:05ccbd4f84f1 60 * - define LWIP_DHCP_AUTOIP_COOP 1 in your lwipopts.h.
hendrikvincent 0:05ccbd4f84f1 61 * - Configure your DHCP Client.
hendrikvincent 0:05ccbd4f84f1 62 *
hendrikvincent 0:05ccbd4f84f1 63 */
hendrikvincent 0:05ccbd4f84f1 64
hendrikvincent 0:05ccbd4f84f1 65 #include "lwip/opt.h"
hendrikvincent 0:05ccbd4f84f1 66
hendrikvincent 0:05ccbd4f84f1 67 #if LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */
hendrikvincent 0:05ccbd4f84f1 68
hendrikvincent 0:05ccbd4f84f1 69 #include "lwip/mem.h"
hendrikvincent 0:05ccbd4f84f1 70 #include "lwip/udp.h"
hendrikvincent 0:05ccbd4f84f1 71 #include "lwip/ip_addr.h"
hendrikvincent 0:05ccbd4f84f1 72 #include "lwip/netif.h"
hendrikvincent 0:05ccbd4f84f1 73 #include "lwip/autoip.h"
hendrikvincent 0:05ccbd4f84f1 74 #include "netif/etharp.h"
hendrikvincent 0:05ccbd4f84f1 75
hendrikvincent 0:05ccbd4f84f1 76 #include <stdlib.h>
hendrikvincent 0:05ccbd4f84f1 77 #include <string.h>
hendrikvincent 0:05ccbd4f84f1 78
hendrikvincent 0:05ccbd4f84f1 79 /* 169.254.0.0 */
hendrikvincent 0:05ccbd4f84f1 80 #define AUTOIP_NET 0xA9FE0000
hendrikvincent 0:05ccbd4f84f1 81 /* 169.254.1.0 */
hendrikvincent 0:05ccbd4f84f1 82 #define AUTOIP_RANGE_START (AUTOIP_NET | 0x0100)
hendrikvincent 0:05ccbd4f84f1 83 /* 169.254.254.255 */
hendrikvincent 0:05ccbd4f84f1 84 #define AUTOIP_RANGE_END (AUTOIP_NET | 0xFEFF)
hendrikvincent 0:05ccbd4f84f1 85
hendrikvincent 0:05ccbd4f84f1 86
hendrikvincent 0:05ccbd4f84f1 87 /** Pseudo random macro based on netif informations.
hendrikvincent 0:05ccbd4f84f1 88 * You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */
hendrikvincent 0:05ccbd4f84f1 89 #ifndef LWIP_AUTOIP_RAND
hendrikvincent 0:05ccbd4f84f1 90 #define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) | \
hendrikvincent 0:05ccbd4f84f1 91 ((u32_t)((netif->hwaddr[3]) & 0xff) << 16) | \
hendrikvincent 0:05ccbd4f84f1 92 ((u32_t)((netif->hwaddr[2]) & 0xff) << 8) | \
hendrikvincent 0:05ccbd4f84f1 93 ((u32_t)((netif->hwaddr[4]) & 0xff))) + \
hendrikvincent 0:05ccbd4f84f1 94 (netif->autoip?netif->autoip->tried_llipaddr:0))
hendrikvincent 0:05ccbd4f84f1 95 #endif /* LWIP_AUTOIP_RAND */
hendrikvincent 0:05ccbd4f84f1 96
hendrikvincent 0:05ccbd4f84f1 97 /**
hendrikvincent 0:05ccbd4f84f1 98 * Macro that generates the initial IP address to be tried by AUTOIP.
hendrikvincent 0:05ccbd4f84f1 99 * If you want to override this, define it to something else in lwipopts.h.
hendrikvincent 0:05ccbd4f84f1 100 */
hendrikvincent 0:05ccbd4f84f1 101 #ifndef LWIP_AUTOIP_CREATE_SEED_ADDR
hendrikvincent 0:05ccbd4f84f1 102 #define LWIP_AUTOIP_CREATE_SEED_ADDR(netif) \
hendrikvincent 0:05ccbd4f84f1 103 htonl(AUTOIP_RANGE_START + ((u32_t)(((u8_t)(netif->hwaddr[4])) | \
hendrikvincent 0:05ccbd4f84f1 104 ((u32_t)((u8_t)(netif->hwaddr[5]))) << 8)))
hendrikvincent 0:05ccbd4f84f1 105 #endif /* LWIP_AUTOIP_CREATE_SEED_ADDR */
hendrikvincent 0:05ccbd4f84f1 106
hendrikvincent 0:05ccbd4f84f1 107 /* static functions */
hendrikvincent 0:05ccbd4f84f1 108 static void autoip_handle_arp_conflict(struct netif *netif);
hendrikvincent 0:05ccbd4f84f1 109
hendrikvincent 0:05ccbd4f84f1 110 /* creates a pseudo random LL IP-Address for a network interface */
hendrikvincent 0:05ccbd4f84f1 111 static void autoip_create_addr(struct netif *netif, ip_addr_t *ipaddr);
hendrikvincent 0:05ccbd4f84f1 112
hendrikvincent 0:05ccbd4f84f1 113 /* sends an ARP probe */
hendrikvincent 0:05ccbd4f84f1 114 static err_t autoip_arp_probe(struct netif *netif);
hendrikvincent 0:05ccbd4f84f1 115
hendrikvincent 0:05ccbd4f84f1 116 /* sends an ARP announce */
hendrikvincent 0:05ccbd4f84f1 117 static err_t autoip_arp_announce(struct netif *netif);
hendrikvincent 0:05ccbd4f84f1 118
hendrikvincent 0:05ccbd4f84f1 119 /* configure interface for use with current LL IP-Address */
hendrikvincent 0:05ccbd4f84f1 120 static err_t autoip_bind(struct netif *netif);
hendrikvincent 0:05ccbd4f84f1 121
hendrikvincent 0:05ccbd4f84f1 122 /* start sending probes for llipaddr */
hendrikvincent 0:05ccbd4f84f1 123 static void autoip_start_probing(struct netif *netif);
hendrikvincent 0:05ccbd4f84f1 124
hendrikvincent 0:05ccbd4f84f1 125 /**
hendrikvincent 0:05ccbd4f84f1 126 * Initialize this module
hendrikvincent 0:05ccbd4f84f1 127 */
hendrikvincent 0:05ccbd4f84f1 128 void
hendrikvincent 0:05ccbd4f84f1 129 autoip_init(void)
hendrikvincent 0:05ccbd4f84f1 130 {
hendrikvincent 0:05ccbd4f84f1 131 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_init()\n"));
hendrikvincent 0:05ccbd4f84f1 132 }
hendrikvincent 0:05ccbd4f84f1 133
hendrikvincent 0:05ccbd4f84f1 134 /** Set a statically allocated struct autoip to work with.
hendrikvincent 0:05ccbd4f84f1 135 * Using this prevents autoip_start to allocate it using mem_malloc.
hendrikvincent 0:05ccbd4f84f1 136 *
hendrikvincent 0:05ccbd4f84f1 137 * @param netif the netif for which to set the struct autoip
hendrikvincent 0:05ccbd4f84f1 138 * @param dhcp (uninitialised) dhcp struct allocated by the application
hendrikvincent 0:05ccbd4f84f1 139 */
hendrikvincent 0:05ccbd4f84f1 140 void
hendrikvincent 0:05ccbd4f84f1 141 autoip_set_struct(struct netif *netif, struct autoip *autoip)
hendrikvincent 0:05ccbd4f84f1 142 {
hendrikvincent 0:05ccbd4f84f1 143 LWIP_ASSERT("netif != NULL", netif != NULL);
hendrikvincent 0:05ccbd4f84f1 144 LWIP_ASSERT("autoip != NULL", autoip != NULL);
hendrikvincent 0:05ccbd4f84f1 145 LWIP_ASSERT("netif already has a struct autoip set", netif->autoip == NULL);
hendrikvincent 0:05ccbd4f84f1 146
hendrikvincent 0:05ccbd4f84f1 147 /* clear data structure */
hendrikvincent 0:05ccbd4f84f1 148 memset(autoip, 0, sizeof(struct autoip));
hendrikvincent 0:05ccbd4f84f1 149 /* autoip->state = AUTOIP_STATE_OFF; */
hendrikvincent 0:05ccbd4f84f1 150 netif->autoip = autoip;
hendrikvincent 0:05ccbd4f84f1 151 }
hendrikvincent 0:05ccbd4f84f1 152
hendrikvincent 0:05ccbd4f84f1 153 /** Restart AutoIP client and check the next address (conflict detected)
hendrikvincent 0:05ccbd4f84f1 154 *
hendrikvincent 0:05ccbd4f84f1 155 * @param netif The netif under AutoIP control
hendrikvincent 0:05ccbd4f84f1 156 */
hendrikvincent 0:05ccbd4f84f1 157 static void
hendrikvincent 0:05ccbd4f84f1 158 autoip_restart(struct netif *netif)
hendrikvincent 0:05ccbd4f84f1 159 {
hendrikvincent 0:05ccbd4f84f1 160 netif->autoip->tried_llipaddr++;
hendrikvincent 0:05ccbd4f84f1 161 autoip_start(netif);
hendrikvincent 0:05ccbd4f84f1 162 }
hendrikvincent 0:05ccbd4f84f1 163
hendrikvincent 0:05ccbd4f84f1 164 /**
hendrikvincent 0:05ccbd4f84f1 165 * Handle a IP address conflict after an ARP conflict detection
hendrikvincent 0:05ccbd4f84f1 166 */
hendrikvincent 0:05ccbd4f84f1 167 static void
hendrikvincent 0:05ccbd4f84f1 168 autoip_handle_arp_conflict(struct netif *netif)
hendrikvincent 0:05ccbd4f84f1 169 {
hendrikvincent 0:05ccbd4f84f1 170 /* Somehow detect if we are defending or retreating */
hendrikvincent 0:05ccbd4f84f1 171 unsigned char defend = 1; /* tbd */
hendrikvincent 0:05ccbd4f84f1 172
hendrikvincent 0:05ccbd4f84f1 173 if(defend) {
hendrikvincent 0:05ccbd4f84f1 174 if(netif->autoip->lastconflict > 0) {
hendrikvincent 0:05ccbd4f84f1 175 /* retreat, there was a conflicting ARP in the last
hendrikvincent 0:05ccbd4f84f1 176 * DEFEND_INTERVAL seconds
hendrikvincent 0:05ccbd4f84f1 177 */
hendrikvincent 0:05ccbd4f84f1 178 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
hendrikvincent 0:05ccbd4f84f1 179 ("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n"));
hendrikvincent 0:05ccbd4f84f1 180
hendrikvincent 0:05ccbd4f84f1 181 /* TODO: close all TCP sessions */
hendrikvincent 0:05ccbd4f84f1 182 autoip_restart(netif);
hendrikvincent 0:05ccbd4f84f1 183 } else {
hendrikvincent 0:05ccbd4f84f1 184 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
hendrikvincent 0:05ccbd4f84f1 185 ("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n"));
hendrikvincent 0:05ccbd4f84f1 186 autoip_arp_announce(netif);
hendrikvincent 0:05ccbd4f84f1 187 netif->autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_TICKS_PER_SECOND;
hendrikvincent 0:05ccbd4f84f1 188 }
hendrikvincent 0:05ccbd4f84f1 189 } else {
hendrikvincent 0:05ccbd4f84f1 190 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
hendrikvincent 0:05ccbd4f84f1 191 ("autoip_handle_arp_conflict(): we do not defend, retreating\n"));
hendrikvincent 0:05ccbd4f84f1 192 /* TODO: close all TCP sessions */
hendrikvincent 0:05ccbd4f84f1 193 autoip_restart(netif);
hendrikvincent 0:05ccbd4f84f1 194 }
hendrikvincent 0:05ccbd4f84f1 195 }
hendrikvincent 0:05ccbd4f84f1 196
hendrikvincent 0:05ccbd4f84f1 197 /**
hendrikvincent 0:05ccbd4f84f1 198 * Create an IP-Address out of range 169.254.1.0 to 169.254.254.255
hendrikvincent 0:05ccbd4f84f1 199 *
hendrikvincent 0:05ccbd4f84f1 200 * @param netif network interface on which create the IP-Address
hendrikvincent 0:05ccbd4f84f1 201 * @param ipaddr ip address to initialize
hendrikvincent 0:05ccbd4f84f1 202 */
hendrikvincent 0:05ccbd4f84f1 203 static void
hendrikvincent 0:05ccbd4f84f1 204 autoip_create_addr(struct netif *netif, ip_addr_t *ipaddr)
hendrikvincent 0:05ccbd4f84f1 205 {
hendrikvincent 0:05ccbd4f84f1 206 /* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255
hendrikvincent 0:05ccbd4f84f1 207 * compliant to RFC 3927 Section 2.1
hendrikvincent 0:05ccbd4f84f1 208 * We have 254 * 256 possibilities */
hendrikvincent 0:05ccbd4f84f1 209
hendrikvincent 0:05ccbd4f84f1 210 u32_t addr = ntohl(LWIP_AUTOIP_CREATE_SEED_ADDR(netif));
hendrikvincent 0:05ccbd4f84f1 211 addr += netif->autoip->tried_llipaddr;
hendrikvincent 0:05ccbd4f84f1 212 addr = AUTOIP_NET | (addr & 0xffff);
hendrikvincent 0:05ccbd4f84f1 213 /* Now, 169.254.0.0 <= addr <= 169.254.255.255 */
hendrikvincent 0:05ccbd4f84f1 214
hendrikvincent 0:05ccbd4f84f1 215 if (addr < AUTOIP_RANGE_START) {
hendrikvincent 0:05ccbd4f84f1 216 addr += AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
hendrikvincent 0:05ccbd4f84f1 217 }
hendrikvincent 0:05ccbd4f84f1 218 if (addr > AUTOIP_RANGE_END) {
hendrikvincent 0:05ccbd4f84f1 219 addr -= AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
hendrikvincent 0:05ccbd4f84f1 220 }
hendrikvincent 0:05ccbd4f84f1 221 LWIP_ASSERT("AUTOIP address not in range", (addr >= AUTOIP_RANGE_START) &&
hendrikvincent 0:05ccbd4f84f1 222 (addr <= AUTOIP_RANGE_END));
hendrikvincent 0:05ccbd4f84f1 223 ip4_addr_set_u32(ipaddr, htonl(addr));
hendrikvincent 0:05ccbd4f84f1 224
hendrikvincent 0:05ccbd4f84f1 225 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
hendrikvincent 0:05ccbd4f84f1 226 ("autoip_create_addr(): tried_llipaddr=%"U16_F", %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
hendrikvincent 0:05ccbd4f84f1 227 (u16_t)(netif->autoip->tried_llipaddr), ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr),
hendrikvincent 0:05ccbd4f84f1 228 ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
hendrikvincent 0:05ccbd4f84f1 229 }
hendrikvincent 0:05ccbd4f84f1 230
hendrikvincent 0:05ccbd4f84f1 231 /**
hendrikvincent 0:05ccbd4f84f1 232 * Sends an ARP probe from a network interface
hendrikvincent 0:05ccbd4f84f1 233 *
hendrikvincent 0:05ccbd4f84f1 234 * @param netif network interface used to send the probe
hendrikvincent 0:05ccbd4f84f1 235 */
hendrikvincent 0:05ccbd4f84f1 236 static err_t
hendrikvincent 0:05ccbd4f84f1 237 autoip_arp_probe(struct netif *netif)
hendrikvincent 0:05ccbd4f84f1 238 {
hendrikvincent 0:05ccbd4f84f1 239 return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
hendrikvincent 0:05ccbd4f84f1 240 (struct eth_addr *)netif->hwaddr, IP_ADDR_ANY, &ethzero,
hendrikvincent 0:05ccbd4f84f1 241 &netif->autoip->llipaddr, ARP_REQUEST);
hendrikvincent 0:05ccbd4f84f1 242 }
hendrikvincent 0:05ccbd4f84f1 243
hendrikvincent 0:05ccbd4f84f1 244 /**
hendrikvincent 0:05ccbd4f84f1 245 * Sends an ARP announce from a network interface
hendrikvincent 0:05ccbd4f84f1 246 *
hendrikvincent 0:05ccbd4f84f1 247 * @param netif network interface used to send the announce
hendrikvincent 0:05ccbd4f84f1 248 */
hendrikvincent 0:05ccbd4f84f1 249 static err_t
hendrikvincent 0:05ccbd4f84f1 250 autoip_arp_announce(struct netif *netif)
hendrikvincent 0:05ccbd4f84f1 251 {
hendrikvincent 0:05ccbd4f84f1 252 return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
hendrikvincent 0:05ccbd4f84f1 253 (struct eth_addr *)netif->hwaddr, &netif->autoip->llipaddr, &ethzero,
hendrikvincent 0:05ccbd4f84f1 254 &netif->autoip->llipaddr, ARP_REQUEST);
hendrikvincent 0:05ccbd4f84f1 255 }
hendrikvincent 0:05ccbd4f84f1 256
hendrikvincent 0:05ccbd4f84f1 257 /**
hendrikvincent 0:05ccbd4f84f1 258 * Configure interface for use with current LL IP-Address
hendrikvincent 0:05ccbd4f84f1 259 *
hendrikvincent 0:05ccbd4f84f1 260 * @param netif network interface to configure with current LL IP-Address
hendrikvincent 0:05ccbd4f84f1 261 */
hendrikvincent 0:05ccbd4f84f1 262 static err_t
hendrikvincent 0:05ccbd4f84f1 263 autoip_bind(struct netif *netif)
hendrikvincent 0:05ccbd4f84f1 264 {
hendrikvincent 0:05ccbd4f84f1 265 struct autoip *autoip = netif->autoip;
hendrikvincent 0:05ccbd4f84f1 266 ip_addr_t sn_mask, gw_addr;
hendrikvincent 0:05ccbd4f84f1 267
hendrikvincent 0:05ccbd4f84f1 268 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
hendrikvincent 0:05ccbd4f84f1 269 ("autoip_bind(netif=%p) %c%c%"U16_F" %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
hendrikvincent 0:05ccbd4f84f1 270 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num,
hendrikvincent 0:05ccbd4f84f1 271 ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr),
hendrikvincent 0:05ccbd4f84f1 272 ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr)));
hendrikvincent 0:05ccbd4f84f1 273
hendrikvincent 0:05ccbd4f84f1 274 IP4_ADDR(&sn_mask, 255, 255, 0, 0);
hendrikvincent 0:05ccbd4f84f1 275 IP4_ADDR(&gw_addr, 0, 0, 0, 0);
hendrikvincent 0:05ccbd4f84f1 276
hendrikvincent 0:05ccbd4f84f1 277 netif_set_ipaddr(netif, &autoip->llipaddr);
hendrikvincent 0:05ccbd4f84f1 278 netif_set_netmask(netif, &sn_mask);
hendrikvincent 0:05ccbd4f84f1 279 netif_set_gw(netif, &gw_addr);
hendrikvincent 0:05ccbd4f84f1 280
hendrikvincent 0:05ccbd4f84f1 281 /* bring the interface up */
hendrikvincent 0:05ccbd4f84f1 282 netif_set_up(netif);
hendrikvincent 0:05ccbd4f84f1 283
hendrikvincent 0:05ccbd4f84f1 284 return ERR_OK;
hendrikvincent 0:05ccbd4f84f1 285 }
hendrikvincent 0:05ccbd4f84f1 286
hendrikvincent 0:05ccbd4f84f1 287 /**
hendrikvincent 0:05ccbd4f84f1 288 * Start AutoIP client
hendrikvincent 0:05ccbd4f84f1 289 *
hendrikvincent 0:05ccbd4f84f1 290 * @param netif network interface on which start the AutoIP client
hendrikvincent 0:05ccbd4f84f1 291 */
hendrikvincent 0:05ccbd4f84f1 292 err_t
hendrikvincent 0:05ccbd4f84f1 293 autoip_start(struct netif *netif)
hendrikvincent 0:05ccbd4f84f1 294 {
hendrikvincent 0:05ccbd4f84f1 295 struct autoip *autoip = netif->autoip;
hendrikvincent 0:05ccbd4f84f1 296 err_t result = ERR_OK;
hendrikvincent 0:05ccbd4f84f1 297
hendrikvincent 0:05ccbd4f84f1 298 if(netif_is_up(netif)) {
hendrikvincent 0:05ccbd4f84f1 299 netif_set_down(netif);
hendrikvincent 0:05ccbd4f84f1 300 }
hendrikvincent 0:05ccbd4f84f1 301
hendrikvincent 0:05ccbd4f84f1 302 /* Set IP-Address, Netmask and Gateway to 0 to make sure that
hendrikvincent 0:05ccbd4f84f1 303 * ARP Packets are formed correctly
hendrikvincent 0:05ccbd4f84f1 304 */
hendrikvincent 0:05ccbd4f84f1 305 ip_addr_set_zero(&netif->ip_addr);
hendrikvincent 0:05ccbd4f84f1 306 ip_addr_set_zero(&netif->netmask);
hendrikvincent 0:05ccbd4f84f1 307 ip_addr_set_zero(&netif->gw);
hendrikvincent 0:05ccbd4f84f1 308
hendrikvincent 0:05ccbd4f84f1 309 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
hendrikvincent 0:05ccbd4f84f1 310 ("autoip_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0],
hendrikvincent 0:05ccbd4f84f1 311 netif->name[1], (u16_t)netif->num));
hendrikvincent 0:05ccbd4f84f1 312 if(autoip == NULL) {
hendrikvincent 0:05ccbd4f84f1 313 /* no AutoIP client attached yet? */
hendrikvincent 0:05ccbd4f84f1 314 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
hendrikvincent 0:05ccbd4f84f1 315 ("autoip_start(): starting new AUTOIP client\n"));
hendrikvincent 0:05ccbd4f84f1 316 autoip = (struct autoip *)mem_malloc(sizeof(struct autoip));
hendrikvincent 0:05ccbd4f84f1 317 if(autoip == NULL) {
hendrikvincent 0:05ccbd4f84f1 318 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
hendrikvincent 0:05ccbd4f84f1 319 ("autoip_start(): could not allocate autoip\n"));
hendrikvincent 0:05ccbd4f84f1 320 return ERR_MEM;
hendrikvincent 0:05ccbd4f84f1 321 }
hendrikvincent 0:05ccbd4f84f1 322 memset(autoip, 0, sizeof(struct autoip));
hendrikvincent 0:05ccbd4f84f1 323 /* store this AutoIP client in the netif */
hendrikvincent 0:05ccbd4f84f1 324 netif->autoip = autoip;
hendrikvincent 0:05ccbd4f84f1 325 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_start(): allocated autoip"));
hendrikvincent 0:05ccbd4f84f1 326 } else {
hendrikvincent 0:05ccbd4f84f1 327 autoip->state = AUTOIP_STATE_OFF;
hendrikvincent 0:05ccbd4f84f1 328 autoip->ttw = 0;
hendrikvincent 0:05ccbd4f84f1 329 autoip->sent_num = 0;
hendrikvincent 0:05ccbd4f84f1 330 ip_addr_set_zero(&autoip->llipaddr);
hendrikvincent 0:05ccbd4f84f1 331 autoip->lastconflict = 0;
hendrikvincent 0:05ccbd4f84f1 332 }
hendrikvincent 0:05ccbd4f84f1 333
hendrikvincent 0:05ccbd4f84f1 334 autoip_create_addr(netif, &(autoip->llipaddr));
hendrikvincent 0:05ccbd4f84f1 335 autoip_start_probing(netif);
hendrikvincent 0:05ccbd4f84f1 336
hendrikvincent 0:05ccbd4f84f1 337 return result;
hendrikvincent 0:05ccbd4f84f1 338 }
hendrikvincent 0:05ccbd4f84f1 339
hendrikvincent 0:05ccbd4f84f1 340 static void
hendrikvincent 0:05ccbd4f84f1 341 autoip_start_probing(struct netif *netif)
hendrikvincent 0:05ccbd4f84f1 342 {
hendrikvincent 0:05ccbd4f84f1 343 struct autoip *autoip = netif->autoip;
hendrikvincent 0:05ccbd4f84f1 344
hendrikvincent 0:05ccbd4f84f1 345 autoip->state = AUTOIP_STATE_PROBING;
hendrikvincent 0:05ccbd4f84f1 346 autoip->sent_num = 0;
hendrikvincent 0:05ccbd4f84f1 347 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
hendrikvincent 0:05ccbd4f84f1 348 ("autoip_start_probing(): changing state to PROBING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
hendrikvincent 0:05ccbd4f84f1 349 ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
hendrikvincent 0:05ccbd4f84f1 350 ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
hendrikvincent 0:05ccbd4f84f1 351
hendrikvincent 0:05ccbd4f84f1 352 /* time to wait to first probe, this is randomly
hendrikvincent 0:05ccbd4f84f1 353 * choosen out of 0 to PROBE_WAIT seconds.
hendrikvincent 0:05ccbd4f84f1 354 * compliant to RFC 3927 Section 2.2.1
hendrikvincent 0:05ccbd4f84f1 355 */
hendrikvincent 0:05ccbd4f84f1 356 autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND));
hendrikvincent 0:05ccbd4f84f1 357
hendrikvincent 0:05ccbd4f84f1 358 /*
hendrikvincent 0:05ccbd4f84f1 359 * if we tried more then MAX_CONFLICTS we must limit our rate for
hendrikvincent 0:05ccbd4f84f1 360 * accquiring and probing address
hendrikvincent 0:05ccbd4f84f1 361 * compliant to RFC 3927 Section 2.2.1
hendrikvincent 0:05ccbd4f84f1 362 */
hendrikvincent 0:05ccbd4f84f1 363 if(autoip->tried_llipaddr > MAX_CONFLICTS) {
hendrikvincent 0:05ccbd4f84f1 364 autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND;
hendrikvincent 0:05ccbd4f84f1 365 }
hendrikvincent 0:05ccbd4f84f1 366 }
hendrikvincent 0:05ccbd4f84f1 367
hendrikvincent 0:05ccbd4f84f1 368 /**
hendrikvincent 0:05ccbd4f84f1 369 * Handle a possible change in the network configuration.
hendrikvincent 0:05ccbd4f84f1 370 *
hendrikvincent 0:05ccbd4f84f1 371 * If there is an AutoIP address configured, take the interface down
hendrikvincent 0:05ccbd4f84f1 372 * and begin probing with the same address.
hendrikvincent 0:05ccbd4f84f1 373 */
hendrikvincent 0:05ccbd4f84f1 374 void
hendrikvincent 0:05ccbd4f84f1 375 autoip_network_changed(struct netif *netif)
hendrikvincent 0:05ccbd4f84f1 376 {
hendrikvincent 0:05ccbd4f84f1 377 if (netif->autoip && netif->autoip->state != AUTOIP_STATE_OFF) {
hendrikvincent 0:05ccbd4f84f1 378 netif_set_down(netif);
hendrikvincent 0:05ccbd4f84f1 379 autoip_start_probing(netif);
hendrikvincent 0:05ccbd4f84f1 380 }
hendrikvincent 0:05ccbd4f84f1 381 }
hendrikvincent 0:05ccbd4f84f1 382
hendrikvincent 0:05ccbd4f84f1 383 /**
hendrikvincent 0:05ccbd4f84f1 384 * Stop AutoIP client
hendrikvincent 0:05ccbd4f84f1 385 *
hendrikvincent 0:05ccbd4f84f1 386 * @param netif network interface on which stop the AutoIP client
hendrikvincent 0:05ccbd4f84f1 387 */
hendrikvincent 0:05ccbd4f84f1 388 err_t
hendrikvincent 0:05ccbd4f84f1 389 autoip_stop(struct netif *netif)
hendrikvincent 0:05ccbd4f84f1 390 {
hendrikvincent 0:05ccbd4f84f1 391 netif->autoip->state = AUTOIP_STATE_OFF;
hendrikvincent 0:05ccbd4f84f1 392 netif_set_down(netif);
hendrikvincent 0:05ccbd4f84f1 393 return ERR_OK;
hendrikvincent 0:05ccbd4f84f1 394 }
hendrikvincent 0:05ccbd4f84f1 395
hendrikvincent 0:05ccbd4f84f1 396 /**
hendrikvincent 0:05ccbd4f84f1 397 * Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds
hendrikvincent 0:05ccbd4f84f1 398 */
hendrikvincent 0:05ccbd4f84f1 399 void
hendrikvincent 0:05ccbd4f84f1 400 autoip_tmr()
hendrikvincent 0:05ccbd4f84f1 401 {
hendrikvincent 0:05ccbd4f84f1 402 struct netif *netif = netif_list;
hendrikvincent 0:05ccbd4f84f1 403 /* loop through netif's */
hendrikvincent 0:05ccbd4f84f1 404 while (netif != NULL) {
hendrikvincent 0:05ccbd4f84f1 405 /* only act on AutoIP configured interfaces */
hendrikvincent 0:05ccbd4f84f1 406 if (netif->autoip != NULL) {
hendrikvincent 0:05ccbd4f84f1 407 if(netif->autoip->lastconflict > 0) {
hendrikvincent 0:05ccbd4f84f1 408 netif->autoip->lastconflict--;
hendrikvincent 0:05ccbd4f84f1 409 }
hendrikvincent 0:05ccbd4f84f1 410
hendrikvincent 0:05ccbd4f84f1 411 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
hendrikvincent 0:05ccbd4f84f1 412 ("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n",
hendrikvincent 0:05ccbd4f84f1 413 (u16_t)(netif->autoip->state), netif->autoip->ttw));
hendrikvincent 0:05ccbd4f84f1 414
hendrikvincent 0:05ccbd4f84f1 415 switch(netif->autoip->state) {
hendrikvincent 0:05ccbd4f84f1 416 case AUTOIP_STATE_PROBING:
hendrikvincent 0:05ccbd4f84f1 417 if(netif->autoip->ttw > 0) {
hendrikvincent 0:05ccbd4f84f1 418 netif->autoip->ttw--;
hendrikvincent 0:05ccbd4f84f1 419 } else {
hendrikvincent 0:05ccbd4f84f1 420 if(netif->autoip->sent_num >= PROBE_NUM) {
hendrikvincent 0:05ccbd4f84f1 421 netif->autoip->state = AUTOIP_STATE_ANNOUNCING;
hendrikvincent 0:05ccbd4f84f1 422 netif->autoip->sent_num = 0;
hendrikvincent 0:05ccbd4f84f1 423 netif->autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND;
hendrikvincent 0:05ccbd4f84f1 424 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
hendrikvincent 0:05ccbd4f84f1 425 ("autoip_tmr(): changing state to ANNOUNCING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
hendrikvincent 0:05ccbd4f84f1 426 ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
hendrikvincent 0:05ccbd4f84f1 427 ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
hendrikvincent 0:05ccbd4f84f1 428 } else {
hendrikvincent 0:05ccbd4f84f1 429 autoip_arp_probe(netif);
hendrikvincent 0:05ccbd4f84f1 430 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
hendrikvincent 0:05ccbd4f84f1 431 ("autoip_tmr() PROBING Sent Probe\n"));
hendrikvincent 0:05ccbd4f84f1 432 netif->autoip->sent_num++;
hendrikvincent 0:05ccbd4f84f1 433 /* calculate time to wait to next probe */
hendrikvincent 0:05ccbd4f84f1 434 netif->autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) %
hendrikvincent 0:05ccbd4f84f1 435 ((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) +
hendrikvincent 0:05ccbd4f84f1 436 PROBE_MIN * AUTOIP_TICKS_PER_SECOND);
hendrikvincent 0:05ccbd4f84f1 437 }
hendrikvincent 0:05ccbd4f84f1 438 }
hendrikvincent 0:05ccbd4f84f1 439 break;
hendrikvincent 0:05ccbd4f84f1 440
hendrikvincent 0:05ccbd4f84f1 441 case AUTOIP_STATE_ANNOUNCING:
hendrikvincent 0:05ccbd4f84f1 442 if(netif->autoip->ttw > 0) {
hendrikvincent 0:05ccbd4f84f1 443 netif->autoip->ttw--;
hendrikvincent 0:05ccbd4f84f1 444 } else {
hendrikvincent 0:05ccbd4f84f1 445 if(netif->autoip->sent_num == 0) {
hendrikvincent 0:05ccbd4f84f1 446 /* We are here the first time, so we waited ANNOUNCE_WAIT seconds
hendrikvincent 0:05ccbd4f84f1 447 * Now we can bind to an IP address and use it.
hendrikvincent 0:05ccbd4f84f1 448 *
hendrikvincent 0:05ccbd4f84f1 449 * autoip_bind calls netif_set_up. This triggers a gratuitous ARP
hendrikvincent 0:05ccbd4f84f1 450 * which counts as an announcement.
hendrikvincent 0:05ccbd4f84f1 451 */
hendrikvincent 0:05ccbd4f84f1 452 autoip_bind(netif);
hendrikvincent 0:05ccbd4f84f1 453 } else {
hendrikvincent 0:05ccbd4f84f1 454 autoip_arp_announce(netif);
hendrikvincent 0:05ccbd4f84f1 455 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
hendrikvincent 0:05ccbd4f84f1 456 ("autoip_tmr() ANNOUNCING Sent Announce\n"));
hendrikvincent 0:05ccbd4f84f1 457 }
hendrikvincent 0:05ccbd4f84f1 458 netif->autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND;
hendrikvincent 0:05ccbd4f84f1 459 netif->autoip->sent_num++;
hendrikvincent 0:05ccbd4f84f1 460
hendrikvincent 0:05ccbd4f84f1 461 if(netif->autoip->sent_num >= ANNOUNCE_NUM) {
hendrikvincent 0:05ccbd4f84f1 462 netif->autoip->state = AUTOIP_STATE_BOUND;
hendrikvincent 0:05ccbd4f84f1 463 netif->autoip->sent_num = 0;
hendrikvincent 0:05ccbd4f84f1 464 netif->autoip->ttw = 0;
hendrikvincent 0:05ccbd4f84f1 465 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
hendrikvincent 0:05ccbd4f84f1 466 ("autoip_tmr(): changing state to BOUND: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
hendrikvincent 0:05ccbd4f84f1 467 ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
hendrikvincent 0:05ccbd4f84f1 468 ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
hendrikvincent 0:05ccbd4f84f1 469 }
hendrikvincent 0:05ccbd4f84f1 470 }
hendrikvincent 0:05ccbd4f84f1 471 break;
hendrikvincent 0:05ccbd4f84f1 472 }
hendrikvincent 0:05ccbd4f84f1 473 }
hendrikvincent 0:05ccbd4f84f1 474 /* proceed to next network interface */
hendrikvincent 0:05ccbd4f84f1 475 netif = netif->next;
hendrikvincent 0:05ccbd4f84f1 476 }
hendrikvincent 0:05ccbd4f84f1 477 }
hendrikvincent 0:05ccbd4f84f1 478
hendrikvincent 0:05ccbd4f84f1 479 /**
hendrikvincent 0:05ccbd4f84f1 480 * Handles every incoming ARP Packet, called by etharp_arp_input.
hendrikvincent 0:05ccbd4f84f1 481 *
hendrikvincent 0:05ccbd4f84f1 482 * @param netif network interface to use for autoip processing
hendrikvincent 0:05ccbd4f84f1 483 * @param hdr Incoming ARP packet
hendrikvincent 0:05ccbd4f84f1 484 */
hendrikvincent 0:05ccbd4f84f1 485 void
hendrikvincent 0:05ccbd4f84f1 486 autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr)
hendrikvincent 0:05ccbd4f84f1 487 {
hendrikvincent 0:05ccbd4f84f1 488 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_arp_reply()\n"));
hendrikvincent 0:05ccbd4f84f1 489 if ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) {
hendrikvincent 0:05ccbd4f84f1 490 /* when ip.src == llipaddr && hw.src != netif->hwaddr
hendrikvincent 0:05ccbd4f84f1 491 *
hendrikvincent 0:05ccbd4f84f1 492 * when probing ip.dst == llipaddr && hw.src != netif->hwaddr
hendrikvincent 0:05ccbd4f84f1 493 * we have a conflict and must solve it
hendrikvincent 0:05ccbd4f84f1 494 */
hendrikvincent 0:05ccbd4f84f1 495 ip_addr_t sipaddr, dipaddr;
hendrikvincent 0:05ccbd4f84f1 496 struct eth_addr netifaddr;
hendrikvincent 0:05ccbd4f84f1 497 netifaddr.addr[0] = netif->hwaddr[0];
hendrikvincent 0:05ccbd4f84f1 498 netifaddr.addr[1] = netif->hwaddr[1];
hendrikvincent 0:05ccbd4f84f1 499 netifaddr.addr[2] = netif->hwaddr[2];
hendrikvincent 0:05ccbd4f84f1 500 netifaddr.addr[3] = netif->hwaddr[3];
hendrikvincent 0:05ccbd4f84f1 501 netifaddr.addr[4] = netif->hwaddr[4];
hendrikvincent 0:05ccbd4f84f1 502 netifaddr.addr[5] = netif->hwaddr[5];
hendrikvincent 0:05ccbd4f84f1 503
hendrikvincent 0:05ccbd4f84f1 504 /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
hendrikvincent 0:05ccbd4f84f1 505 * structure packing (not using structure copy which breaks strict-aliasing rules).
hendrikvincent 0:05ccbd4f84f1 506 */
hendrikvincent 0:05ccbd4f84f1 507 IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
hendrikvincent 0:05ccbd4f84f1 508 IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
hendrikvincent 0:05ccbd4f84f1 509
hendrikvincent 0:05ccbd4f84f1 510 if ((netif->autoip->state == AUTOIP_STATE_PROBING) ||
hendrikvincent 0:05ccbd4f84f1 511 ((netif->autoip->state == AUTOIP_STATE_ANNOUNCING) &&
hendrikvincent 0:05ccbd4f84f1 512 (netif->autoip->sent_num == 0))) {
hendrikvincent 0:05ccbd4f84f1 513 /* RFC 3927 Section 2.2.1:
hendrikvincent 0:05ccbd4f84f1 514 * from beginning to after ANNOUNCE_WAIT
hendrikvincent 0:05ccbd4f84f1 515 * seconds we have a conflict if
hendrikvincent 0:05ccbd4f84f1 516 * ip.src == llipaddr OR
hendrikvincent 0:05ccbd4f84f1 517 * ip.dst == llipaddr && hw.src != own hwaddr
hendrikvincent 0:05ccbd4f84f1 518 */
hendrikvincent 0:05ccbd4f84f1 519 if ((ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr)) ||
hendrikvincent 0:05ccbd4f84f1 520 (ip_addr_cmp(&dipaddr, &netif->autoip->llipaddr) &&
hendrikvincent 0:05ccbd4f84f1 521 !eth_addr_cmp(&netifaddr, &hdr->shwaddr))) {
hendrikvincent 0:05ccbd4f84f1 522 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
hendrikvincent 0:05ccbd4f84f1 523 ("autoip_arp_reply(): Probe Conflict detected\n"));
hendrikvincent 0:05ccbd4f84f1 524 autoip_restart(netif);
hendrikvincent 0:05ccbd4f84f1 525 }
hendrikvincent 0:05ccbd4f84f1 526 } else {
hendrikvincent 0:05ccbd4f84f1 527 /* RFC 3927 Section 2.5:
hendrikvincent 0:05ccbd4f84f1 528 * in any state we have a conflict if
hendrikvincent 0:05ccbd4f84f1 529 * ip.src == llipaddr && hw.src != own hwaddr
hendrikvincent 0:05ccbd4f84f1 530 */
hendrikvincent 0:05ccbd4f84f1 531 if (ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr) &&
hendrikvincent 0:05ccbd4f84f1 532 !eth_addr_cmp(&netifaddr, &hdr->shwaddr)) {
hendrikvincent 0:05ccbd4f84f1 533 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
hendrikvincent 0:05ccbd4f84f1 534 ("autoip_arp_reply(): Conflicting ARP-Packet detected\n"));
hendrikvincent 0:05ccbd4f84f1 535 autoip_handle_arp_conflict(netif);
hendrikvincent 0:05ccbd4f84f1 536 }
hendrikvincent 0:05ccbd4f84f1 537 }
hendrikvincent 0:05ccbd4f84f1 538 }
hendrikvincent 0:05ccbd4f84f1 539 }
hendrikvincent 0:05ccbd4f84f1 540
hendrikvincent 0:05ccbd4f84f1 541 #endif /* LWIP_AUTOIP */