1 /**
2 * @file
3 * AutoIP Automatic LinkLocal IP Configuration
4 *
5 * This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
6 * with RFC 3927.
7 *
8 * @defgroup autoip AUTOIP
9 * @ingroup ip4
10 * AUTOIP related functions
11 * USAGE:
12 *
13 * define @ref LWIP_AUTOIP 1 in your lwipopts.h
14 * Options:
15 * AUTOIP_TMR_INTERVAL msecs,
16 * I recommend a value of 100. The value must divide 1000 with a remainder almost 0.
17 * Possible values are 1000, 500, 333, 250, 200, 166, 142, 125, 111, 100 ....
18 *
19 * Without DHCP:
20 * - Call autoip_start() after netif_add().
21 *
22 * With DHCP:
23 * - define @ref LWIP_DHCP_AUTOIP_COOP 1 in your lwipopts.h.
24 * - Configure your DHCP Client.
25 *
26 * @see netifapi_autoip
27 */
28
29 /*
30 *
31 * Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
32 * All rights reserved.
33 *
34 * Redistribution and use in source and binary forms, with or without modification,
35 * are permitted provided that the following conditions are met:
36 *
37 * 1. Redistributions of source code must retain the above copyright notice,
38 * this list of conditions and the following disclaimer.
39 * 2. Redistributions in binary form must reproduce the above copyright notice,
40 * this list of conditions and the following disclaimer in the documentation
41 * and/or other materials provided with the distribution.
42 * 3. The name of the author may not be used to endorse or promote products
43 * derived from this software without specific prior written permission.
44 *
45 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
46 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
47 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
48 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
49 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
50 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
51 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
52 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
53 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
54 * OF SUCH DAMAGE.
55 *
56 * Author: Dominik Spies <kontakt@dspies.de>
57 */
58
59 #include "lwip/opt.h"
60
61 #if LWIP_IPV4 && LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */
62
63 #include "lwip/mem.h"
64 /* #include "lwip/udp.h" */
65 #include "lwip/ip_addr.h"
66 #include "lwip/netif.h"
67 #include "lwip/autoip.h"
68 #include "lwip/etharp.h"
69 #include "lwip/prot/autoip.h"
70
71 #include <string.h>
72
73 /** Pseudo random macro based on netif informations.
74 * You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */
75 #ifndef LWIP_AUTOIP_RAND
76 #define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) | \
77 ((u32_t)((netif->hwaddr[3]) & 0xff) << 16) | \
78 ((u32_t)((netif->hwaddr[2]) & 0xff) << 8) | \
79 ((u32_t)((netif->hwaddr[4]) & 0xff))) + \
80 (netif_autoip_data(netif)? netif_autoip_data(netif)->tried_llipaddr : 0))
81 #endif /* LWIP_AUTOIP_RAND */
82
83 /**
84 * Macro that generates the initial IP address to be tried by AUTOIP.
85 * If you want to override this, define it to something else in lwipopts.h.
86 */
87 #ifndef LWIP_AUTOIP_CREATE_SEED_ADDR
88 #define LWIP_AUTOIP_CREATE_SEED_ADDR(netif) \
89 lwip_htonl(AUTOIP_RANGE_START + ((u32_t)(((u8_t)(netif->hwaddr[4])) | \
90 ((u32_t)((u8_t)(netif->hwaddr[5]))) << 8)))
91 #endif /* LWIP_AUTOIP_CREATE_SEED_ADDR */
92
93 /* static functions */
94 static err_t autoip_arp_announce(struct netif *netif);
95 static void autoip_start_probing(struct netif *netif);
96
97 /**
98 * @ingroup autoip
99 * Set a statically allocated struct autoip to work with.
100 * Using this prevents autoip_start to allocate it using mem_malloc.
101 *
102 * @param netif the netif for which to set the struct autoip
103 * @param autoip (uninitialised) autoip struct allocated by the application
104 */
105 void
autoip_set_struct(struct netif * netif,struct autoip * autoip)106 autoip_set_struct(struct netif *netif, struct autoip *autoip)
107 {
108 LWIP_ASSERT_CORE_LOCKED();
109 LWIP_ASSERT("netif != NULL", netif != NULL);
110 LWIP_ASSERT("autoip != NULL", autoip != NULL);
111 LWIP_ASSERT("netif already has a struct autoip set",
112 netif_autoip_data(netif) == NULL);
113
114 /* clear data structure */
115 memset(autoip, 0, sizeof(struct autoip));
116 /* autoip->state = AUTOIP_STATE_OFF; */
117 netif_set_client_data(netif, LWIP_NETIF_CLIENT_DATA_INDEX_AUTOIP, autoip);
118 }
119
120 /** Restart AutoIP client and check the next address (conflict detected)
121 *
122 * @param netif The netif under AutoIP control
123 */
124 static void
autoip_restart(struct netif * netif)125 autoip_restart(struct netif *netif)
126 {
127 struct autoip *autoip = netif_autoip_data(netif);
128 autoip->tried_llipaddr++;
129 autoip_start(netif);
130 }
131
132 /**
133 * Handle a IP address conflict after an ARP conflict detection
134 */
135 static void
autoip_handle_arp_conflict(struct netif * netif)136 autoip_handle_arp_conflict(struct netif *netif)
137 {
138 struct autoip *autoip = netif_autoip_data(netif);
139
140 /* RFC3927, 2.5 "Conflict Detection and Defense" allows two options where
141 a) means retreat on the first conflict and
142 b) allows to keep an already configured address when having only one
143 conflict in 10 seconds
144 We use option b) since it helps to improve the chance that one of the two
145 conflicting hosts may be able to retain its address. */
146
147 if (autoip->lastconflict > 0) {
148 /* retreat, there was a conflicting ARP in the last DEFEND_INTERVAL seconds */
149 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
150 ("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n"));
151
152 /* Active TCP sessions are aborted when removing the ip addresss */
153 autoip_restart(netif);
154 } else {
155 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
156 ("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n"));
157 autoip_arp_announce(netif);
158 autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_TICKS_PER_SECOND;
159 }
160 }
161
162 /**
163 * Create an IP-Address out of range 169.254.1.0 to 169.254.254.255
164 *
165 * @param netif network interface on which create the IP-Address
166 * @param ipaddr ip address to initialize
167 */
168 static void
autoip_create_addr(struct netif * netif,ip4_addr_t * ipaddr)169 autoip_create_addr(struct netif *netif, ip4_addr_t *ipaddr)
170 {
171 struct autoip *autoip = netif_autoip_data(netif);
172
173 /* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255
174 * compliant to RFC 3927 Section 2.1
175 * We have 254 * 256 possibilities */
176
177 u32_t addr = lwip_ntohl(LWIP_AUTOIP_CREATE_SEED_ADDR(netif));
178 addr += autoip->tried_llipaddr;
179 addr = AUTOIP_NET | (addr & 0xffff);
180 /* Now, 169.254.0.0 <= addr <= 169.254.255.255 */
181
182 if (addr < AUTOIP_RANGE_START) {
183 addr += AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
184 }
185 if (addr > AUTOIP_RANGE_END) {
186 addr -= AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
187 }
188 LWIP_ASSERT("AUTOIP address not in range", (addr >= AUTOIP_RANGE_START) &&
189 (addr <= AUTOIP_RANGE_END));
190 ip4_addr_set_u32(ipaddr, lwip_htonl(addr));
191
192 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
193 ("autoip_create_addr(): tried_llipaddr=%"U16_F", %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
194 (u16_t)(autoip->tried_llipaddr), ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr),
195 ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
196 }
197
198 /**
199 * Sends an ARP probe from a network interface
200 *
201 * @param netif network interface used to send the probe
202 */
203 static err_t
autoip_arp_probe(struct netif * netif)204 autoip_arp_probe(struct netif *netif)
205 {
206 struct autoip *autoip = netif_autoip_data(netif);
207 /* this works because netif->ip_addr is ANY */
208 return etharp_request(netif, &autoip->llipaddr);
209 }
210
211 /**
212 * Sends an ARP announce from a network interface
213 *
214 * @param netif network interface used to send the announce
215 */
216 static err_t
autoip_arp_announce(struct netif * netif)217 autoip_arp_announce(struct netif *netif)
218 {
219 return etharp_gratuitous(netif);
220 }
221
222 /**
223 * Configure interface for use with current LL IP-Address
224 *
225 * @param netif network interface to configure with current LL IP-Address
226 */
227 static err_t
autoip_bind(struct netif * netif)228 autoip_bind(struct netif *netif)
229 {
230 struct autoip *autoip = netif_autoip_data(netif);
231 ip4_addr_t sn_mask, gw_addr;
232
233 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
234 ("autoip_bind(netif=%p) %s%"U16_F" %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
235 (void *)netif, netif->name, (u16_t)netif->num,
236 ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr),
237 ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr)));
238
239 IP4_ADDR(&sn_mask, 255, 255, 0, 0);
240 IP4_ADDR(&gw_addr, 0, 0, 0, 0);
241
242 (void)netif_set_addr(netif, &autoip->llipaddr, &sn_mask, &gw_addr);
243 /* interface is used by routing now that an address is set */
244
245 return ERR_OK;
246 }
247
248 /**
249 * @ingroup autoip
250 * Start AutoIP client
251 *
252 * @param netif network interface on which start the AutoIP client
253 */
254 err_t
autoip_start(struct netif * netif)255 autoip_start(struct netif *netif)
256 {
257 struct autoip *autoip = NULL;
258 err_t result = ERR_OK;
259
260 LWIP_ERROR("netif is NULL", (netif != NULL), return ERR_ARG);
261 LWIP_ERROR("netif is not up, old style port?", netif_is_up(netif), return ERR_ARG);
262
263 autoip = netif_autoip_data(netif);
264
265 /* Set IP-Address, Netmask and Gateway to 0 to make sure that
266 * ARP Packets are formed correctly
267 */
268 (void)netif_set_addr(netif, IP4_ADDR_ANY4, IP4_ADDR_ANY4, IP4_ADDR_ANY4);
269
270 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
271 ("autoip_start(netif=%p) %s%"U16_F"\n", (void *)netif, netif->name, (u16_t)netif->num));
272 if (autoip == NULL) {
273 /* no AutoIP client attached yet? */
274 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
275 ("autoip_start(): starting new AUTOIP client\n"));
276 autoip = (struct autoip *)mem_calloc(1, sizeof(struct autoip));
277 if (autoip == NULL) {
278 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
279 ("autoip_start(): could not allocate autoip\n"));
280 return ERR_MEM;
281 }
282 /* store this AutoIP client in the netif */
283 netif_set_client_data(netif, LWIP_NETIF_CLIENT_DATA_INDEX_AUTOIP, autoip);
284 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_start(): allocated autoip"));
285 } else {
286 autoip->state = AUTOIP_STATE_OFF;
287 autoip->ttw = 0;
288 autoip->sent_num = 0;
289 ip4_addr_set_zero(&autoip->llipaddr);
290 autoip->lastconflict = 0;
291 }
292
293 autoip_create_addr(netif, &(autoip->llipaddr));
294 autoip_start_probing(netif);
295
296 return result;
297 }
298
299 static void
autoip_start_probing(struct netif * netif)300 autoip_start_probing(struct netif *netif)
301 {
302 struct autoip *autoip = netif_autoip_data(netif);
303
304 autoip->state = AUTOIP_STATE_PROBING;
305 autoip->sent_num = 0;
306 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
307 ("autoip_start_probing(): changing state to PROBING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
308 ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr),
309 ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr)));
310
311 /* time to wait to first probe, this is randomly
312 * chosen out of 0 to PROBE_WAIT seconds.
313 * compliant to RFC 3927 Section 2.2.1
314 */
315 autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND));
316
317 /*
318 * if we tried more then MAX_CONFLICTS we must limit our rate for
319 * acquiring and probing address
320 * compliant to RFC 3927 Section 2.2.1
321 */
322 if (autoip->tried_llipaddr > MAX_CONFLICTS) {
323 autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND;
324 }
325 }
326
327 /**
328 * Handle a possible change in the network configuration.
329 *
330 * If there is an AutoIP address configured, take the interface down
331 * and begin probing with the same address.
332 */
333 void
autoip_network_changed(struct netif * netif)334 autoip_network_changed(struct netif *netif)
335 {
336 struct autoip *autoip = netif_autoip_data(netif);
337
338 if (autoip && (autoip->state != AUTOIP_STATE_OFF)) {
339 autoip_start_probing(netif);
340 }
341 }
342
343 /**
344 * @ingroup autoip
345 * Stop AutoIP client
346 *
347 * @param netif network interface on which stop the AutoIP client
348 */
349 err_t
autoip_stop(struct netif * netif)350 autoip_stop(struct netif *netif)
351 {
352 struct autoip *autoip = NULL;
353 LWIP_ERROR("netif is NULL", (netif != NULL), return ERR_ARG);
354
355 autoip = netif_autoip_data(netif);
356 if (autoip != NULL) {
357 autoip->state = AUTOIP_STATE_OFF;
358 if (ip4_addr_islinklocal(netif_ip4_addr(netif))) {
359 (void)netif_set_addr(netif, IP4_ADDR_ANY4, IP4_ADDR_ANY4, IP4_ADDR_ANY4);
360 }
361 }
362 return ERR_OK;
363 }
364
365 #if LWIP_LOWPOWER
366 #include "lwip/lowpower.h"
367 u32_t
autoip_tmr_tick(void)368 autoip_tmr_tick(void)
369 {
370 struct netif *netif = netif_list;
371 u32_t tick = 0;
372
373 while (netif != NULL) {
374 struct autoip *autoip = netif_autoip_data(netif);
375 if ((autoip != NULL) && (autoip->ttw > 0)) {
376 if ((autoip->state == AUTOIP_STATE_PROBING) ||
377 (autoip->state == AUTOIP_STATE_ANNOUNCING)) {
378 SET_TMR_TICK(tick, autoip->ttw);
379 }
380 }
381 netif = netif->next;
382 }
383
384 LOWPOWER_DEBUG(("%s tmr tick: %u\n", __func__, tick));
385 return tick;
386 }
387
388 #endif
389
390 /**
391 * Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds
392 */
393 void
autoip_tmr(void)394 autoip_tmr(void)
395 {
396 struct netif *netif;
397 /* loop through netif's */
398 NETIF_FOREACH(netif) {
399 struct autoip *autoip = netif_autoip_data(netif);
400 /* only act on AutoIP configured interfaces */
401 if (autoip != NULL) {
402 if (autoip->lastconflict > 0) {
403 autoip->lastconflict--;
404 }
405
406 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
407 ("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n",
408 (u16_t)(autoip->state), autoip->ttw));
409
410 if (autoip->ttw > 0) {
411 autoip->ttw--;
412 }
413
414 switch (autoip->state) {
415 case AUTOIP_STATE_PROBING:
416 if (autoip->ttw == 0) {
417 if (autoip->sent_num >= PROBE_NUM) {
418 /* Switch to ANNOUNCING: now we can bind to an IP address and use it */
419 autoip->state = AUTOIP_STATE_ANNOUNCING;
420 autoip_bind(netif);
421 /* autoip_bind() calls netif_set_addr(): this triggers a gratuitous ARP
422 which counts as an announcement */
423 autoip->sent_num = 1;
424 autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND;
425 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
426 ("autoip_tmr(): changing state to ANNOUNCING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
427 ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr),
428 ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr)));
429 } else {
430 autoip_arp_probe(netif);
431 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_tmr() PROBING Sent Probe\n"));
432 autoip->sent_num++;
433 if (autoip->sent_num == PROBE_NUM) {
434 /* calculate time to wait to for announce */
435 autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND;
436 } else {
437 /* calculate time to wait to next probe */
438 autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) %
439 ((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) +
440 PROBE_MIN * AUTOIP_TICKS_PER_SECOND);
441 }
442 }
443 }
444 break;
445
446 case AUTOIP_STATE_ANNOUNCING:
447 if (autoip->ttw == 0) {
448 autoip_arp_announce(netif);
449 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_tmr() ANNOUNCING Sent Announce\n"));
450 autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND;
451 autoip->sent_num++;
452
453 if (autoip->sent_num >= ANNOUNCE_NUM) {
454 autoip->state = AUTOIP_STATE_BOUND;
455 autoip->sent_num = 0;
456 autoip->ttw = 0;
457 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
458 ("autoip_tmr(): changing state to BOUND: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
459 ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr),
460 ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr)));
461 }
462 }
463 break;
464
465 default:
466 /* nothing to do in other states */
467 break;
468 }
469 }
470 }
471 }
472
473 /**
474 * Handles every incoming ARP Packet, called by etharp_input().
475 *
476 * @param netif network interface to use for autoip processing
477 * @param hdr Incoming ARP packet
478 */
479 void
autoip_arp_reply(struct netif * netif,struct etharp_hdr * hdr)480 autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr)
481 {
482 struct autoip *autoip = netif_autoip_data(netif);
483
484 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_arp_reply()\n"));
485 if ((autoip != NULL) && (autoip->state != AUTOIP_STATE_OFF)) {
486 /* when ip.src == llipaddr && hw.src != netif->hwaddr
487 *
488 * when probing ip.dst == llipaddr && hw.src != netif->hwaddr
489 * we have a conflict and must solve it
490 */
491 ip4_addr_t sipaddr, dipaddr;
492 struct eth_addr netifaddr;
493 SMEMCPY(netifaddr.addr, netif->hwaddr, ETH_HWADDR_LEN);
494
495 /* Copy struct ip4_addr_wordaligned to aligned ip4_addr, to support compilers without
496 * structure packing (not using structure copy which breaks strict-aliasing rules).
497 */
498 IPADDR_WORDALIGNED_COPY_TO_IP4_ADDR_T(&sipaddr, &hdr->sipaddr);
499 IPADDR_WORDALIGNED_COPY_TO_IP4_ADDR_T(&dipaddr, &hdr->dipaddr);
500
501 if (autoip->state == AUTOIP_STATE_PROBING) {
502 /* RFC 3927 Section 2.2.1:
503 * from beginning to after ANNOUNCE_WAIT
504 * seconds we have a conflict if
505 * ip.src == llipaddr OR
506 * ip.dst == llipaddr && hw.src != own hwaddr
507 */
508 if ((ip4_addr_cmp(&sipaddr, &autoip->llipaddr)) ||
509 (ip4_addr_isany_val(sipaddr) &&
510 ip4_addr_cmp(&dipaddr, &autoip->llipaddr) &&
511 !eth_addr_cmp(&netifaddr, &hdr->shwaddr))) {
512 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
513 ("autoip_arp_reply(): Probe Conflict detected\n"));
514 autoip_restart(netif);
515 }
516 } else {
517 /* RFC 3927 Section 2.5:
518 * in any state we have a conflict if
519 * ip.src == llipaddr && hw.src != own hwaddr
520 */
521 if (ip4_addr_cmp(&sipaddr, &autoip->llipaddr) &&
522 !eth_addr_cmp(&netifaddr, &hdr->shwaddr)) {
523 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
524 ("autoip_arp_reply(): Conflicting ARP-Packet detected\n"));
525 autoip_handle_arp_conflict(netif);
526 }
527 }
528 }
529 }
530
531 /** check if AutoIP supplied netif->ip_addr
532 *
533 * @param netif the netif to check
534 * @return 1 if AutoIP supplied netif->ip_addr (state BOUND or ANNOUNCING),
535 * 0 otherwise
536 */
537 u8_t
autoip_supplied_address(const struct netif * netif)538 autoip_supplied_address(const struct netif *netif)
539 {
540 if ((netif != NULL) && (netif_autoip_data(netif) != NULL)) {
541 struct autoip *autoip = netif_autoip_data(netif);
542 return (autoip->state == AUTOIP_STATE_BOUND) || (autoip->state == AUTOIP_STATE_ANNOUNCING);
543 }
544 return 0;
545 }
546
547 u8_t
autoip_accept_packet(struct netif * netif,const ip4_addr_t * addr)548 autoip_accept_packet(struct netif *netif, const ip4_addr_t *addr)
549 {
550 struct autoip *autoip = netif_autoip_data(netif);
551 return (autoip != NULL) && ip4_addr_cmp(addr, &(autoip->llipaddr));
552 }
553
554 #endif /* LWIP_IPV4 && LWIP_AUTOIP */
555