Ethernet for Nucleo and Disco board STM32F746 works with gcc and arm. IAC is untested
Dependents: STM32F746_iothub_client_sample_mqtt DISCO-F746NG_Ethernet Nucleo_F746ZG_Ethernet thethingsiO-DISCO_F746NG-mqtt ... more
autoip.c
00001 /** 00002 * @file 00003 * AutoIP Automatic LinkLocal IP Configuration 00004 * 00005 */ 00006 00007 /* 00008 * 00009 * Copyright (c) 2007 Dominik Spies <kontakt@dspies.de> 00010 * All rights reserved. 00011 * 00012 * Redistribution and use in source and binary forms, with or without modification, 00013 * are permitted provided that the following conditions are met: 00014 * 00015 * 1. Redistributions of source code must retain the above copyright notice, 00016 * this list of conditions and the following disclaimer. 00017 * 2. Redistributions in binary form must reproduce the above copyright notice, 00018 * this list of conditions and the following disclaimer in the documentation 00019 * and/or other materials provided with the distribution. 00020 * 3. The name of the author may not be used to endorse or promote products 00021 * derived from this software without specific prior written permission. 00022 * 00023 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 00024 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00025 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 00026 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00027 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 00028 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00029 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00030 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 00031 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 00032 * OF SUCH DAMAGE. 00033 * 00034 * Author: Dominik Spies <kontakt@dspies.de> 00035 * 00036 * This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform 00037 * with RFC 3927. 00038 * 00039 * 00040 * Please coordinate changes and requests with Dominik Spies 00041 * <kontakt@dspies.de> 00042 */ 00043 00044 /******************************************************************************* 00045 * USAGE: 00046 * 00047 * define LWIP_AUTOIP 1 in your lwipopts.h 00048 * 00049 * If you don't use tcpip.c (so, don't call, you don't call tcpip_init): 00050 * - First, call autoip_init(). 00051 * - call autoip_tmr() all AUTOIP_TMR_INTERVAL msces, 00052 * that should be defined in autoip.h. 00053 * I recommend a value of 100. The value must divide 1000 with a remainder almost 0. 00054 * Possible values are 1000, 500, 333, 250, 200, 166, 142, 125, 111, 100 .... 00055 * 00056 * Without DHCP: 00057 * - Call autoip_start() after netif_add(). 00058 * 00059 * With DHCP: 00060 * - define LWIP_DHCP_AUTOIP_COOP 1 in your lwipopts.h. 00061 * - Configure your DHCP Client. 00062 * 00063 */ 00064 00065 #include "lwip/opt.h" 00066 00067 #if LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */ 00068 00069 #include "lwip/mem.h" 00070 #include "lwip/udp.h" 00071 #include "lwip/ip_addr.h" 00072 #include "lwip/netif.h" 00073 #include "lwip/autoip.h" 00074 #include "netif/etharp.h" 00075 00076 #include <stdlib.h> 00077 #include <string.h> 00078 00079 /* 169.254.0.0 */ 00080 #define AUTOIP_NET 0xA9FE0000 00081 /* 169.254.1.0 */ 00082 #define AUTOIP_RANGE_START (AUTOIP_NET | 0x0100) 00083 /* 169.254.254.255 */ 00084 #define AUTOIP_RANGE_END (AUTOIP_NET | 0xFEFF) 00085 00086 00087 /** Pseudo random macro based on netif informations. 00088 * You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */ 00089 #ifndef LWIP_AUTOIP_RAND 00090 #define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) | \ 00091 ((u32_t)((netif->hwaddr[3]) & 0xff) << 16) | \ 00092 ((u32_t)((netif->hwaddr[2]) & 0xff) << 8) | \ 00093 ((u32_t)((netif->hwaddr[4]) & 0xff))) + \ 00094 (netif->autoip?netif->autoip->tried_llipaddr:0)) 00095 #endif /* LWIP_AUTOIP_RAND */ 00096 00097 /** 00098 * Macro that generates the initial IP address to be tried by AUTOIP. 00099 * If you want to override this, define it to something else in lwipopts.h. 00100 */ 00101 #ifndef LWIP_AUTOIP_CREATE_SEED_ADDR 00102 #define LWIP_AUTOIP_CREATE_SEED_ADDR(netif) \ 00103 htonl(AUTOIP_RANGE_START + ((u32_t)(((u8_t)(netif->hwaddr[4])) | \ 00104 ((u32_t)((u8_t)(netif->hwaddr[5]))) << 8))) 00105 #endif /* LWIP_AUTOIP_CREATE_SEED_ADDR */ 00106 00107 /* static functions */ 00108 static void autoip_handle_arp_conflict(struct netif *netif); 00109 00110 /* creates a pseudo random LL IP-Address for a network interface */ 00111 static void autoip_create_addr(struct netif *netif, ip_addr_t *ipaddr); 00112 00113 /* sends an ARP probe */ 00114 static err_t autoip_arp_probe(struct netif *netif); 00115 00116 /* sends an ARP announce */ 00117 static err_t autoip_arp_announce(struct netif *netif); 00118 00119 /* configure interface for use with current LL IP-Address */ 00120 static err_t autoip_bind(struct netif *netif); 00121 00122 /* start sending probes for llipaddr */ 00123 static void autoip_start_probing(struct netif *netif); 00124 00125 00126 /** Set a statically allocated struct autoip to work with. 00127 * Using this prevents autoip_start to allocate it using mem_malloc. 00128 * 00129 * @param netif the netif for which to set the struct autoip 00130 * @param dhcp (uninitialised) dhcp struct allocated by the application 00131 */ 00132 void 00133 autoip_set_struct(struct netif *netif, struct autoip *autoip) 00134 { 00135 LWIP_ASSERT("netif != NULL", netif != NULL); 00136 LWIP_ASSERT("autoip != NULL", autoip != NULL); 00137 LWIP_ASSERT("netif already has a struct autoip set", netif->autoip == NULL); 00138 00139 /* clear data structure */ 00140 memset(autoip, 0, sizeof(struct autoip)); 00141 /* autoip->state = AUTOIP_STATE_OFF; */ 00142 netif->autoip = autoip; 00143 } 00144 00145 /** Restart AutoIP client and check the next address (conflict detected) 00146 * 00147 * @param netif The netif under AutoIP control 00148 */ 00149 static void 00150 autoip_restart(struct netif *netif) 00151 { 00152 netif->autoip->tried_llipaddr++; 00153 autoip_start(netif); 00154 } 00155 00156 /** 00157 * Handle a IP address conflict after an ARP conflict detection 00158 */ 00159 static void 00160 autoip_handle_arp_conflict(struct netif *netif) 00161 { 00162 /* Somehow detect if we are defending or retreating */ 00163 unsigned char defend = 1; /* tbd */ 00164 00165 if (defend) { 00166 if (netif->autoip->lastconflict > 0) { 00167 /* retreat, there was a conflicting ARP in the last 00168 * DEFEND_INTERVAL seconds 00169 */ 00170 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, 00171 ("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n")); 00172 00173 /* TODO: close all TCP sessions */ 00174 autoip_restart(netif); 00175 } else { 00176 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, 00177 ("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n")); 00178 autoip_arp_announce(netif); 00179 netif->autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_TICKS_PER_SECOND; 00180 } 00181 } else { 00182 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, 00183 ("autoip_handle_arp_conflict(): we do not defend, retreating\n")); 00184 /* TODO: close all TCP sessions */ 00185 autoip_restart(netif); 00186 } 00187 } 00188 00189 /** 00190 * Create an IP-Address out of range 169.254.1.0 to 169.254.254.255 00191 * 00192 * @param netif network interface on which create the IP-Address 00193 * @param ipaddr ip address to initialize 00194 */ 00195 static void 00196 autoip_create_addr(struct netif *netif, ip_addr_t *ipaddr) 00197 { 00198 /* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255 00199 * compliant to RFC 3927 Section 2.1 00200 * We have 254 * 256 possibilities */ 00201 00202 u32_t addr = ntohl(LWIP_AUTOIP_CREATE_SEED_ADDR(netif)); 00203 addr += netif->autoip->tried_llipaddr; 00204 addr = AUTOIP_NET | (addr & 0xffff); 00205 /* Now, 169.254.0.0 <= addr <= 169.254.255.255 */ 00206 00207 if (addr < AUTOIP_RANGE_START) { 00208 addr += AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1; 00209 } 00210 if (addr > AUTOIP_RANGE_END) { 00211 addr -= AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1; 00212 } 00213 LWIP_ASSERT("AUTOIP address not in range", (addr >= AUTOIP_RANGE_START) && 00214 (addr <= AUTOIP_RANGE_END)); 00215 ip4_addr_set_u32(ipaddr, htonl(addr)); 00216 00217 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, 00218 ("autoip_create_addr(): tried_llipaddr=%"U16_F", %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n", 00219 (u16_t)(netif->autoip->tried_llipaddr), ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), 00220 ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr))); 00221 } 00222 00223 /** 00224 * Sends an ARP probe from a network interface 00225 * 00226 * @param netif network interface used to send the probe 00227 */ 00228 static err_t 00229 autoip_arp_probe(struct netif *netif) 00230 { 00231 return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, ðbroadcast, 00232 (struct eth_addr *)netif->hwaddr, IP_ADDR_ANY, ðzero, 00233 &netif->autoip->llipaddr, ARP_REQUEST); 00234 } 00235 00236 /** 00237 * Sends an ARP announce from a network interface 00238 * 00239 * @param netif network interface used to send the announce 00240 */ 00241 static err_t 00242 autoip_arp_announce(struct netif *netif) 00243 { 00244 return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, ðbroadcast, 00245 (struct eth_addr *)netif->hwaddr, &netif->autoip->llipaddr, ðzero, 00246 &netif->autoip->llipaddr, ARP_REQUEST); 00247 } 00248 00249 /** 00250 * Configure interface for use with current LL IP-Address 00251 * 00252 * @param netif network interface to configure with current LL IP-Address 00253 */ 00254 static err_t 00255 autoip_bind(struct netif *netif) 00256 { 00257 struct autoip *autoip = netif->autoip; 00258 ip_addr_t sn_mask, gw_addr; 00259 00260 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, 00261 ("autoip_bind(netif=%p) %c%c%"U16_F" %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n", 00262 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num, 00263 ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr), 00264 ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr))); 00265 00266 IP4_ADDR(&sn_mask, 255, 255, 0, 0); 00267 IP4_ADDR(&gw_addr, 0, 0, 0, 0); 00268 00269 netif_set_ipaddr(netif, &autoip->llipaddr); 00270 netif_set_netmask(netif, &sn_mask); 00271 netif_set_gw(netif, &gw_addr); 00272 00273 /* bring the interface up */ 00274 netif_set_up(netif); 00275 00276 return ERR_OK; 00277 } 00278 00279 /** 00280 * Start AutoIP client 00281 * 00282 * @param netif network interface on which start the AutoIP client 00283 */ 00284 err_t 00285 autoip_start(struct netif *netif) 00286 { 00287 struct autoip *autoip = netif->autoip; 00288 err_t result = ERR_OK; 00289 00290 if (netif_is_up(netif)) { 00291 netif_set_down(netif); 00292 } 00293 00294 /* Set IP-Address, Netmask and Gateway to 0 to make sure that 00295 * ARP Packets are formed correctly 00296 */ 00297 ip_addr_set_zero(&netif->ip_addr); 00298 ip_addr_set_zero(&netif->netmask); 00299 ip_addr_set_zero(&netif->gw); 00300 00301 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, 00302 ("autoip_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], 00303 netif->name[1], (u16_t)netif->num)); 00304 if (autoip == NULL) { 00305 /* no AutoIP client attached yet? */ 00306 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, 00307 ("autoip_start(): starting new AUTOIP client\n")); 00308 autoip = (struct autoip *)mem_malloc(sizeof(struct autoip)); 00309 if (autoip == NULL) { 00310 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, 00311 ("autoip_start(): could not allocate autoip\n")); 00312 return ERR_MEM; 00313 } 00314 memset(autoip, 0, sizeof(struct autoip)); 00315 /* store this AutoIP client in the netif */ 00316 netif->autoip = autoip; 00317 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_start(): allocated autoip")); 00318 } else { 00319 autoip->state = AUTOIP_STATE_OFF; 00320 autoip->ttw = 0; 00321 autoip->sent_num = 0; 00322 ip_addr_set_zero(&autoip->llipaddr); 00323 autoip->lastconflict = 0; 00324 } 00325 00326 autoip_create_addr(netif, &(autoip->llipaddr)); 00327 autoip_start_probing(netif); 00328 00329 return result; 00330 } 00331 00332 static void 00333 autoip_start_probing(struct netif *netif) 00334 { 00335 struct autoip *autoip = netif->autoip; 00336 00337 autoip->state = AUTOIP_STATE_PROBING; 00338 autoip->sent_num = 0; 00339 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, 00340 ("autoip_start_probing(): changing state to PROBING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n", 00341 ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr), 00342 ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr))); 00343 00344 /* time to wait to first probe, this is randomly 00345 * choosen out of 0 to PROBE_WAIT seconds. 00346 * compliant to RFC 3927 Section 2.2.1 00347 */ 00348 autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND)); 00349 00350 /* 00351 * if we tried more then MAX_CONFLICTS we must limit our rate for 00352 * accquiring and probing address 00353 * compliant to RFC 3927 Section 2.2.1 00354 */ 00355 if (autoip->tried_llipaddr > MAX_CONFLICTS) { 00356 autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND; 00357 } 00358 } 00359 00360 /** 00361 * Handle a possible change in the network configuration. 00362 * 00363 * If there is an AutoIP address configured, take the interface down 00364 * and begin probing with the same address. 00365 */ 00366 void 00367 autoip_network_changed(struct netif *netif) 00368 { 00369 if (netif->autoip && netif->autoip->state != AUTOIP_STATE_OFF) { 00370 netif_set_down(netif); 00371 autoip_start_probing(netif); 00372 } 00373 } 00374 00375 /** 00376 * Stop AutoIP client 00377 * 00378 * @param netif network interface on which stop the AutoIP client 00379 */ 00380 err_t 00381 autoip_stop(struct netif *netif) 00382 { 00383 netif->autoip->state = AUTOIP_STATE_OFF; 00384 netif_set_down(netif); 00385 return ERR_OK; 00386 } 00387 00388 /** 00389 * Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds 00390 */ 00391 void 00392 autoip_tmr() 00393 { 00394 struct netif *netif = netif_list; 00395 /* loop through netif's */ 00396 while (netif != NULL) { 00397 /* only act on AutoIP configured interfaces */ 00398 if (netif->autoip != NULL) { 00399 if (netif->autoip->lastconflict > 0) { 00400 netif->autoip->lastconflict--; 00401 } 00402 00403 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, 00404 ("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n", 00405 (u16_t)(netif->autoip->state), netif->autoip->ttw)); 00406 00407 switch(netif->autoip->state) { 00408 case AUTOIP_STATE_PROBING: 00409 if (netif->autoip->ttw > 0) { 00410 netif->autoip->ttw--; 00411 } else { 00412 if (netif->autoip->sent_num >= PROBE_NUM) { 00413 netif->autoip->state = AUTOIP_STATE_ANNOUNCING; 00414 netif->autoip->sent_num = 0; 00415 netif->autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND; 00416 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, 00417 ("autoip_tmr(): changing state to ANNOUNCING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n", 00418 ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr), 00419 ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr))); 00420 } else { 00421 autoip_arp_probe(netif); 00422 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, 00423 ("autoip_tmr() PROBING Sent Probe\n")); 00424 netif->autoip->sent_num++; 00425 /* calculate time to wait to next probe */ 00426 netif->autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) % 00427 ((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) + 00428 PROBE_MIN * AUTOIP_TICKS_PER_SECOND); 00429 } 00430 } 00431 break; 00432 00433 case AUTOIP_STATE_ANNOUNCING: 00434 if (netif->autoip->ttw > 0) { 00435 netif->autoip->ttw--; 00436 } else { 00437 if (netif->autoip->sent_num == 0) { 00438 /* We are here the first time, so we waited ANNOUNCE_WAIT seconds 00439 * Now we can bind to an IP address and use it. 00440 * 00441 * autoip_bind calls netif_set_up. This triggers a gratuitous ARP 00442 * which counts as an announcement. 00443 */ 00444 autoip_bind(netif); 00445 } else { 00446 autoip_arp_announce(netif); 00447 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, 00448 ("autoip_tmr() ANNOUNCING Sent Announce\n")); 00449 } 00450 netif->autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND; 00451 netif->autoip->sent_num++; 00452 00453 if (netif->autoip->sent_num >= ANNOUNCE_NUM) { 00454 netif->autoip->state = AUTOIP_STATE_BOUND; 00455 netif->autoip->sent_num = 0; 00456 netif->autoip->ttw = 0; 00457 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, 00458 ("autoip_tmr(): changing state to BOUND: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n", 00459 ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr), 00460 ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr))); 00461 } 00462 } 00463 break; 00464 } 00465 } 00466 /* proceed to next network interface */ 00467 netif = netif->next; 00468 } 00469 } 00470 00471 /** 00472 * Handles every incoming ARP Packet, called by etharp_arp_input. 00473 * 00474 * @param netif network interface to use for autoip processing 00475 * @param hdr Incoming ARP packet 00476 */ 00477 void 00478 autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr) 00479 { 00480 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_arp_reply()\n")); 00481 if ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) { 00482 /* when ip.src == llipaddr && hw.src != netif->hwaddr 00483 * 00484 * when probing ip.dst == llipaddr && hw.src != netif->hwaddr 00485 * we have a conflict and must solve it 00486 */ 00487 ip_addr_t sipaddr, dipaddr; 00488 struct eth_addr netifaddr; 00489 ETHADDR16_COPY(netifaddr.addr, netif->hwaddr); 00490 00491 /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without 00492 * structure packing (not using structure copy which breaks strict-aliasing rules). 00493 */ 00494 IPADDR2_COPY(&sipaddr, &hdr->sipaddr); 00495 IPADDR2_COPY(&dipaddr, &hdr->dipaddr); 00496 00497 if ((netif->autoip->state == AUTOIP_STATE_PROBING) || 00498 ((netif->autoip->state == AUTOIP_STATE_ANNOUNCING) && 00499 (netif->autoip->sent_num == 0))) { 00500 /* RFC 3927 Section 2.2.1: 00501 * from beginning to after ANNOUNCE_WAIT 00502 * seconds we have a conflict if 00503 * ip.src == llipaddr OR 00504 * ip.dst == llipaddr && hw.src != own hwaddr 00505 */ 00506 if ((ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr)) || 00507 (ip_addr_cmp(&dipaddr, &netif->autoip->llipaddr) && 00508 !eth_addr_cmp(&netifaddr, &hdr->shwaddr))) { 00509 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING, 00510 ("autoip_arp_reply(): Probe Conflict detected\n")); 00511 autoip_restart(netif); 00512 } 00513 } else { 00514 /* RFC 3927 Section 2.5: 00515 * in any state we have a conflict if 00516 * ip.src == llipaddr && hw.src != own hwaddr 00517 */ 00518 if (ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr) && 00519 !eth_addr_cmp(&netifaddr, &hdr->shwaddr)) { 00520 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING, 00521 ("autoip_arp_reply(): Conflicting ARP-Packet detected\n")); 00522 autoip_handle_arp_conflict(netif); 00523 } 00524 } 00525 } 00526 } 00527 00528 #endif /* LWIP_AUTOIP */
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