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Commit | Line | Data |
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e3dca008 TG |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright (C) 2014 Axis Communications AB. All rights reserved. | |
5 | Copyright (C) 2015 Tom Gundersen | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
21 | #include <arpa/inet.h> | |
22 | #include <errno.h> | |
23 | #include <stdio.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | ||
07630cea LP |
27 | #include "sd-ipv4acd.h" |
28 | ||
b5efdb8a | 29 | #include "alloc-util.h" |
07630cea | 30 | #include "arp-util.h" |
e78f9587 | 31 | #include "ether-addr-util.h" |
3ffd4af2 | 32 | #include "fd-util.h" |
e3dca008 TG |
33 | #include "in-addr-util.h" |
34 | #include "list.h" | |
e3dca008 TG |
35 | #include "random-util.h" |
36 | #include "siphash24.h" | |
d246e77a | 37 | #include "string-util.h" |
e3dca008 TG |
38 | #include "util.h" |
39 | ||
e3dca008 | 40 | /* Constants from the RFC */ |
e3f4eedb LP |
41 | #define PROBE_WAIT_USEC (1U * USEC_PER_SEC) |
42 | #define PROBE_NUM 3U | |
43 | #define PROBE_MIN_USEC (1U * USEC_PER_SEC) | |
44 | #define PROBE_MAX_USEC (2U * USEC_PER_SEC) | |
45 | #define ANNOUNCE_WAIT_USEC (2U * USEC_PER_SEC) | |
46 | #define ANNOUNCE_NUM 2U | |
47 | #define ANNOUNCE_INTERVAL_USEC (2U * USEC_PER_SEC) | |
48 | #define MAX_CONFLICTS 10U | |
49 | #define RATE_LIMIT_INTERVAL_USEC (60U * USEC_PER_SEC) | |
50 | #define DEFEND_INTERVAL_USEC (10U * USEC_PER_SEC) | |
e3dca008 | 51 | |
e3dca008 TG |
52 | typedef enum IPv4ACDState { |
53 | IPV4ACD_STATE_INIT, | |
c9e458a4 | 54 | IPV4ACD_STATE_STARTED, |
e3dca008 TG |
55 | IPV4ACD_STATE_WAITING_PROBE, |
56 | IPV4ACD_STATE_PROBING, | |
57 | IPV4ACD_STATE_WAITING_ANNOUNCE, | |
58 | IPV4ACD_STATE_ANNOUNCING, | |
59 | IPV4ACD_STATE_RUNNING, | |
60 | _IPV4ACD_STATE_MAX, | |
61 | _IPV4ACD_STATE_INVALID = -1 | |
62 | } IPv4ACDState; | |
63 | ||
64 | struct sd_ipv4acd { | |
c116f526 | 65 | unsigned n_ref; |
e3dca008 TG |
66 | |
67 | IPv4ACDState state; | |
2f8e7633 | 68 | int ifindex; |
e3dca008 | 69 | int fd; |
784cdc2d LP |
70 | |
71 | unsigned n_iteration; | |
72 | unsigned n_conflict; | |
73 | ||
4dbf7b3a LP |
74 | sd_event_source *receive_message_event_source; |
75 | sd_event_source *timer_event_source; | |
784cdc2d | 76 | |
e3dca008 TG |
77 | usec_t defend_window; |
78 | be32_t address; | |
784cdc2d | 79 | |
e3dca008 TG |
80 | /* External */ |
81 | struct ether_addr mac_addr; | |
784cdc2d | 82 | |
e3dca008 TG |
83 | sd_event *event; |
84 | int event_priority; | |
45aa74c7 | 85 | sd_ipv4acd_callback_t callback; |
e3dca008 TG |
86 | void* userdata; |
87 | }; | |
88 | ||
3aacc173 LP |
89 | #define log_ipv4acd_errno(ll, error, fmt, ...) log_internal(LOG_DEBUG, error, __FILE__, __LINE__, __func__, "IPV4ACD: " fmt, ##__VA_ARGS__) |
90 | #define log_ipv4acd(ll, fmt, ...) log_ipv4acd_errno(ll, 0, fmt, ##__VA_ARGS__) | |
91 | ||
d246e77a LP |
92 | static void ipv4acd_set_state(sd_ipv4acd *ll, IPv4ACDState st, bool reset_counter) { |
93 | assert(ll); | |
94 | assert(st < _IPV4ACD_STATE_MAX); | |
95 | ||
96 | if (st == ll->state && !reset_counter) | |
97 | ll->n_iteration++; | |
98 | else { | |
99 | ll->state = st; | |
100 | ll->n_iteration = 0; | |
101 | } | |
102 | } | |
103 | ||
104 | static void ipv4acd_reset(sd_ipv4acd *ll) { | |
105 | assert(ll); | |
106 | ||
107 | ll->timer_event_source = sd_event_source_unref(ll->timer_event_source); | |
108 | ll->receive_message_event_source = sd_event_source_unref(ll->receive_message_event_source); | |
109 | ||
110 | ll->fd = safe_close(ll->fd); | |
111 | ||
112 | ipv4acd_set_state(ll, IPV4ACD_STATE_INIT, true); | |
113 | } | |
114 | ||
e3dca008 | 115 | sd_ipv4acd *sd_ipv4acd_ref(sd_ipv4acd *ll) { |
c116f526 LP |
116 | if (!ll) |
117 | return NULL; | |
118 | ||
119 | assert_se(ll->n_ref >= 1); | |
120 | ll->n_ref++; | |
e3dca008 TG |
121 | |
122 | return ll; | |
123 | } | |
124 | ||
125 | sd_ipv4acd *sd_ipv4acd_unref(sd_ipv4acd *ll) { | |
c116f526 LP |
126 | if (!ll) |
127 | return NULL; | |
128 | ||
129 | assert_se(ll->n_ref >= 1); | |
130 | ll->n_ref--; | |
131 | ||
132 | if (ll->n_ref > 0) | |
e3dca008 TG |
133 | return NULL; |
134 | ||
d246e77a | 135 | ipv4acd_reset(ll); |
e3dca008 TG |
136 | sd_ipv4acd_detach_event(ll); |
137 | ||
138 | free(ll); | |
139 | ||
140 | return NULL; | |
141 | } | |
142 | ||
e3dca008 | 143 | int sd_ipv4acd_new(sd_ipv4acd **ret) { |
4afd3348 | 144 | _cleanup_(sd_ipv4acd_unrefp) sd_ipv4acd *ll = NULL; |
e3dca008 TG |
145 | |
146 | assert_return(ret, -EINVAL); | |
147 | ||
148 | ll = new0(sd_ipv4acd, 1); | |
149 | if (!ll) | |
150 | return -ENOMEM; | |
151 | ||
c116f526 | 152 | ll->n_ref = 1; |
e3dca008 | 153 | ll->state = IPV4ACD_STATE_INIT; |
2f8e7633 | 154 | ll->ifindex = -1; |
e3dca008 TG |
155 | ll->fd = -1; |
156 | ||
157 | *ret = ll; | |
158 | ll = NULL; | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
e3dca008 TG |
163 | static void ipv4acd_client_notify(sd_ipv4acd *ll, int event) { |
164 | assert(ll); | |
165 | ||
45aa74c7 | 166 | if (!ll->callback) |
e095f51d LP |
167 | return; |
168 | ||
45aa74c7 | 169 | ll->callback(ll, event, ll->userdata); |
e3dca008 TG |
170 | } |
171 | ||
d246e77a LP |
172 | int sd_ipv4acd_stop(sd_ipv4acd *ll) { |
173 | assert_return(ll, -EINVAL); | |
e3dca008 | 174 | |
d246e77a | 175 | ipv4acd_reset(ll); |
e3dca008 | 176 | |
a48fc60a | 177 | log_ipv4acd(ll, "STOPPED"); |
e3dca008 | 178 | |
2237aa02 | 179 | ipv4acd_client_notify(ll, SD_IPV4ACD_EVENT_STOP); |
e3dca008 TG |
180 | |
181 | return 0; | |
182 | } | |
183 | ||
184 | static int ipv4acd_on_timeout(sd_event_source *s, uint64_t usec, void *userdata); | |
185 | ||
e3f4eedb | 186 | static int ipv4acd_set_next_wakeup(sd_ipv4acd *ll, usec_t usec, usec_t random_usec) { |
4afd3348 | 187 | _cleanup_(sd_event_source_unrefp) sd_event_source *timer = NULL; |
e3f4eedb | 188 | usec_t next_timeout, time_now; |
e3dca008 TG |
189 | int r; |
190 | ||
e3dca008 TG |
191 | assert(ll); |
192 | ||
e3f4eedb | 193 | next_timeout = usec; |
e3dca008 | 194 | |
e3f4eedb LP |
195 | if (random_usec > 0) |
196 | next_timeout += (usec_t) random_u64() % random_usec; | |
e3dca008 TG |
197 | |
198 | assert_se(sd_event_now(ll->event, clock_boottime_or_monotonic(), &time_now) >= 0); | |
199 | ||
e3f4eedb | 200 | r = sd_event_add_time(ll->event, &timer, clock_boottime_or_monotonic(), time_now + next_timeout, 0, ipv4acd_on_timeout, ll); |
e3dca008 TG |
201 | if (r < 0) |
202 | return r; | |
203 | ||
204 | r = sd_event_source_set_priority(timer, ll->event_priority); | |
205 | if (r < 0) | |
206 | return r; | |
207 | ||
4dbf7b3a | 208 | (void) sd_event_source_set_description(timer, "ipv4acd-timer"); |
e3dca008 | 209 | |
4dbf7b3a LP |
210 | sd_event_source_unref(ll->timer_event_source); |
211 | ll->timer_event_source = timer; | |
e3dca008 TG |
212 | timer = NULL; |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | static bool ipv4acd_arp_conflict(sd_ipv4acd *ll, struct ether_arp *arp) { | |
218 | assert(ll); | |
219 | assert(arp); | |
220 | ||
221 | /* see the BPF */ | |
222 | if (memcmp(arp->arp_spa, &ll->address, sizeof(ll->address)) == 0) | |
223 | return true; | |
224 | ||
225 | /* the TPA matched instead of the SPA, this is not a conflict */ | |
226 | return false; | |
227 | } | |
228 | ||
229 | static int ipv4acd_on_timeout(sd_event_source *s, uint64_t usec, void *userdata) { | |
230 | sd_ipv4acd *ll = userdata; | |
231 | int r = 0; | |
232 | ||
233 | assert(ll); | |
234 | ||
235 | switch (ll->state) { | |
e3dca008 | 236 | |
c9e458a4 | 237 | case IPV4ACD_STATE_STARTED: |
e3dca008 TG |
238 | ipv4acd_set_state(ll, IPV4ACD_STATE_WAITING_PROBE, true); |
239 | ||
784cdc2d | 240 | if (ll->n_conflict >= MAX_CONFLICTS) { |
e3f4eedb LP |
241 | char ts[FORMAT_TIMESPAN_MAX]; |
242 | log_ipv4acd(ll, "Max conflicts reached, delaying by %s", format_timespan(ts, sizeof(ts), RATE_LIMIT_INTERVAL_USEC, 0)); | |
a48fc60a | 243 | |
e3f4eedb | 244 | r = ipv4acd_set_next_wakeup(ll, RATE_LIMIT_INTERVAL_USEC, PROBE_WAIT_USEC); |
e3dca008 | 245 | if (r < 0) |
ff0c5ebd | 246 | goto fail; |
e3dca008 | 247 | |
784cdc2d | 248 | ll->n_conflict = 0; |
e3dca008 | 249 | } else { |
e3f4eedb | 250 | r = ipv4acd_set_next_wakeup(ll, 0, PROBE_WAIT_USEC); |
e3dca008 | 251 | if (r < 0) |
ff0c5ebd | 252 | goto fail; |
e3dca008 TG |
253 | } |
254 | ||
255 | break; | |
4dbf7b3a | 256 | |
e3dca008 TG |
257 | case IPV4ACD_STATE_WAITING_PROBE: |
258 | case IPV4ACD_STATE_PROBING: | |
259 | /* Send a probe */ | |
2f8e7633 | 260 | r = arp_send_probe(ll->fd, ll->ifindex, ll->address, &ll->mac_addr); |
e3dca008 | 261 | if (r < 0) { |
a48fc60a | 262 | log_ipv4acd_errno(ll, r, "Failed to send ARP probe: %m"); |
ff0c5ebd | 263 | goto fail; |
e3dca008 TG |
264 | } else { |
265 | _cleanup_free_ char *address = NULL; | |
266 | union in_addr_union addr = { .in.s_addr = ll->address }; | |
267 | ||
d246e77a LP |
268 | (void) in_addr_to_string(AF_INET, &addr, &address); |
269 | log_ipv4acd(ll, "Probing %s", strna(address)); | |
e3dca008 TG |
270 | } |
271 | ||
784cdc2d | 272 | if (ll->n_iteration < PROBE_NUM - 2) { |
e3dca008 TG |
273 | ipv4acd_set_state(ll, IPV4ACD_STATE_PROBING, false); |
274 | ||
e3f4eedb | 275 | r = ipv4acd_set_next_wakeup(ll, PROBE_MIN_USEC, (PROBE_MAX_USEC-PROBE_MIN_USEC)); |
e3dca008 | 276 | if (r < 0) |
ff0c5ebd | 277 | goto fail; |
e3dca008 TG |
278 | } else { |
279 | ipv4acd_set_state(ll, IPV4ACD_STATE_WAITING_ANNOUNCE, true); | |
280 | ||
e3f4eedb | 281 | r = ipv4acd_set_next_wakeup(ll, ANNOUNCE_WAIT_USEC, 0); |
e3dca008 | 282 | if (r < 0) |
ff0c5ebd | 283 | goto fail; |
e3dca008 TG |
284 | } |
285 | ||
286 | break; | |
287 | ||
288 | case IPV4ACD_STATE_ANNOUNCING: | |
784cdc2d | 289 | if (ll->n_iteration >= ANNOUNCE_NUM - 1) { |
e3dca008 | 290 | ipv4acd_set_state(ll, IPV4ACD_STATE_RUNNING, false); |
e3dca008 TG |
291 | break; |
292 | } | |
4dbf7b3a LP |
293 | |
294 | /* fall through */ | |
295 | ||
e3dca008 TG |
296 | case IPV4ACD_STATE_WAITING_ANNOUNCE: |
297 | /* Send announcement packet */ | |
2f8e7633 | 298 | r = arp_send_announcement(ll->fd, ll->ifindex, ll->address, &ll->mac_addr); |
e3dca008 | 299 | if (r < 0) { |
a48fc60a | 300 | log_ipv4acd_errno(ll, r, "Failed to send ARP announcement: %m"); |
ff0c5ebd | 301 | goto fail; |
e3dca008 | 302 | } else |
a48fc60a | 303 | log_ipv4acd(ll, "ANNOUNCE"); |
e3dca008 TG |
304 | |
305 | ipv4acd_set_state(ll, IPV4ACD_STATE_ANNOUNCING, false); | |
306 | ||
e3f4eedb | 307 | r = ipv4acd_set_next_wakeup(ll, ANNOUNCE_INTERVAL_USEC, 0); |
e3dca008 | 308 | if (r < 0) |
ff0c5ebd | 309 | goto fail; |
e3dca008 | 310 | |
784cdc2d LP |
311 | if (ll->n_iteration == 0) { |
312 | ll->n_conflict = 0; | |
2237aa02 | 313 | ipv4acd_client_notify(ll, SD_IPV4ACD_EVENT_BIND); |
e3dca008 TG |
314 | } |
315 | ||
316 | break; | |
4dbf7b3a | 317 | |
e3dca008 TG |
318 | default: |
319 | assert_not_reached("Invalid state."); | |
320 | } | |
321 | ||
ff0c5ebd | 322 | return 0; |
e3dca008 | 323 | |
ff0c5ebd LP |
324 | fail: |
325 | sd_ipv4acd_stop(ll); | |
326 | return 0; | |
e3dca008 TG |
327 | } |
328 | ||
329 | static void ipv4acd_on_conflict(sd_ipv4acd *ll) { | |
330 | _cleanup_free_ char *address = NULL; | |
331 | union in_addr_union addr = { .in.s_addr = ll->address }; | |
e3dca008 TG |
332 | |
333 | assert(ll); | |
334 | ||
784cdc2d | 335 | ll->n_conflict++; |
e3dca008 | 336 | |
d246e77a LP |
337 | (void) in_addr_to_string(AF_INET, &addr, &address); |
338 | log_ipv4acd(ll, "Conflict on %s (%u)", strna(address), ll->n_conflict); | |
e3dca008 | 339 | |
d246e77a | 340 | ipv4acd_reset(ll); |
2237aa02 | 341 | ipv4acd_client_notify(ll, SD_IPV4ACD_EVENT_CONFLICT); |
e3dca008 TG |
342 | } |
343 | ||
e095f51d LP |
344 | static int ipv4acd_on_packet( |
345 | sd_event_source *s, | |
346 | int fd, | |
347 | uint32_t revents, | |
348 | void *userdata) { | |
349 | ||
e3dca008 TG |
350 | sd_ipv4acd *ll = userdata; |
351 | struct ether_arp packet; | |
e095f51d | 352 | ssize_t n; |
e3dca008 TG |
353 | int r; |
354 | ||
e095f51d | 355 | assert(s); |
e3dca008 TG |
356 | assert(ll); |
357 | assert(fd >= 0); | |
358 | ||
e095f51d LP |
359 | n = recv(fd, &packet, sizeof(struct ether_arp), 0); |
360 | if (n < 0) { | |
004845d1 LP |
361 | if (errno == EAGAIN || errno == EINTR) |
362 | return 0; | |
363 | ||
ff0c5ebd LP |
364 | log_ipv4acd_errno(ll, errno, "Failed to read ARP packet: %m"); |
365 | goto fail; | |
e095f51d LP |
366 | } |
367 | if ((size_t) n != sizeof(struct ether_arp)) { | |
a48fc60a | 368 | log_ipv4acd(ll, "Ignoring too short ARP packet."); |
e095f51d LP |
369 | return 0; |
370 | } | |
e3dca008 TG |
371 | |
372 | switch (ll->state) { | |
e095f51d | 373 | |
e3dca008 TG |
374 | case IPV4ACD_STATE_ANNOUNCING: |
375 | case IPV4ACD_STATE_RUNNING: | |
e095f51d | 376 | |
e3dca008 TG |
377 | if (ipv4acd_arp_conflict(ll, &packet)) { |
378 | usec_t ts; | |
379 | ||
380 | assert_se(sd_event_now(ll->event, clock_boottime_or_monotonic(), &ts) >= 0); | |
381 | ||
382 | /* Defend address */ | |
383 | if (ts > ll->defend_window) { | |
e3f4eedb | 384 | ll->defend_window = ts + DEFEND_INTERVAL_USEC; |
2f8e7633 | 385 | r = arp_send_announcement(ll->fd, ll->ifindex, ll->address, &ll->mac_addr); |
e3dca008 | 386 | if (r < 0) { |
a48fc60a | 387 | log_ipv4acd_errno(ll, r, "Failed to send ARP announcement: %m"); |
ff0c5ebd | 388 | goto fail; |
e3dca008 | 389 | } else |
a48fc60a | 390 | log_ipv4acd(ll, "DEFEND"); |
e3dca008 TG |
391 | |
392 | } else | |
393 | ipv4acd_on_conflict(ll); | |
394 | } | |
e3dca008 | 395 | break; |
e095f51d | 396 | |
e3dca008 TG |
397 | case IPV4ACD_STATE_WAITING_PROBE: |
398 | case IPV4ACD_STATE_PROBING: | |
399 | case IPV4ACD_STATE_WAITING_ANNOUNCE: | |
400 | /* BPF ensures this packet indicates a conflict */ | |
401 | ipv4acd_on_conflict(ll); | |
e3dca008 | 402 | break; |
e095f51d | 403 | |
e3dca008 TG |
404 | default: |
405 | assert_not_reached("Invalid state."); | |
406 | } | |
407 | ||
ff0c5ebd | 408 | return 0; |
e3dca008 | 409 | |
ff0c5ebd LP |
410 | fail: |
411 | sd_ipv4acd_stop(ll); | |
412 | return 0; | |
e3dca008 TG |
413 | } |
414 | ||
2f8e7633 | 415 | int sd_ipv4acd_set_ifindex(sd_ipv4acd *ll, int ifindex) { |
e3dca008 | 416 | assert_return(ll, -EINVAL); |
2f8e7633 | 417 | assert_return(ifindex > 0, -EINVAL); |
e3dca008 TG |
418 | assert_return(ll->state == IPV4ACD_STATE_INIT, -EBUSY); |
419 | ||
2f8e7633 | 420 | ll->ifindex = ifindex; |
e3dca008 TG |
421 | |
422 | return 0; | |
423 | } | |
424 | ||
425 | int sd_ipv4acd_set_mac(sd_ipv4acd *ll, const struct ether_addr *addr) { | |
426 | assert_return(ll, -EINVAL); | |
427 | assert_return(addr, -EINVAL); | |
428 | assert_return(ll->state == IPV4ACD_STATE_INIT, -EBUSY); | |
429 | ||
d914f7a5 | 430 | ll->mac_addr = *addr; |
e3dca008 TG |
431 | |
432 | return 0; | |
433 | } | |
434 | ||
435 | int sd_ipv4acd_detach_event(sd_ipv4acd *ll) { | |
436 | assert_return(ll, -EINVAL); | |
437 | ||
438 | ll->event = sd_event_unref(ll->event); | |
439 | ||
440 | return 0; | |
441 | } | |
442 | ||
32d20645 | 443 | int sd_ipv4acd_attach_event(sd_ipv4acd *ll, sd_event *event, int64_t priority) { |
e3dca008 TG |
444 | int r; |
445 | ||
446 | assert_return(ll, -EINVAL); | |
447 | assert_return(!ll->event, -EBUSY); | |
448 | ||
449 | if (event) | |
450 | ll->event = sd_event_ref(event); | |
451 | else { | |
452 | r = sd_event_default(&ll->event); | |
453 | if (r < 0) | |
454 | return r; | |
455 | } | |
456 | ||
457 | ll->event_priority = priority; | |
458 | ||
459 | return 0; | |
460 | } | |
461 | ||
ccf86354 | 462 | int sd_ipv4acd_set_callback(sd_ipv4acd *ll, sd_ipv4acd_callback_t cb, void *userdata) { |
e3dca008 TG |
463 | assert_return(ll, -EINVAL); |
464 | ||
45aa74c7 | 465 | ll->callback = cb; |
e3dca008 TG |
466 | ll->userdata = userdata; |
467 | ||
468 | return 0; | |
469 | } | |
470 | ||
9ed794a3 | 471 | int sd_ipv4acd_set_address(sd_ipv4acd *ll, const struct in_addr *address) { |
e3dca008 TG |
472 | assert_return(ll, -EINVAL); |
473 | assert_return(address, -EINVAL); | |
474 | assert_return(ll->state == IPV4ACD_STATE_INIT, -EBUSY); | |
475 | ||
476 | ll->address = address->s_addr; | |
477 | ||
478 | return 0; | |
479 | } | |
480 | ||
04c01369 | 481 | int sd_ipv4acd_is_running(sd_ipv4acd *ll) { |
e3dca008 TG |
482 | assert_return(ll, false); |
483 | ||
484 | return ll->state != IPV4ACD_STATE_INIT; | |
485 | } | |
486 | ||
e3dca008 TG |
487 | int sd_ipv4acd_start(sd_ipv4acd *ll) { |
488 | int r; | |
489 | ||
490 | assert_return(ll, -EINVAL); | |
491 | assert_return(ll->event, -EINVAL); | |
2f8e7633 | 492 | assert_return(ll->ifindex > 0, -EINVAL); |
e3dca008 | 493 | assert_return(ll->address != 0, -EINVAL); |
e78f9587 | 494 | assert_return(!ether_addr_is_null(&ll->mac_addr), -EINVAL); |
e3dca008 TG |
495 | assert_return(ll->state == IPV4ACD_STATE_INIT, -EBUSY); |
496 | ||
2f8e7633 | 497 | r = arp_network_bind_raw_socket(ll->ifindex, ll->address, &ll->mac_addr); |
e3dca008 | 498 | if (r < 0) |
d246e77a | 499 | return r; |
e3dca008 | 500 | |
d246e77a | 501 | safe_close(ll->fd); |
e3dca008 | 502 | ll->fd = r; |
d246e77a | 503 | ll->defend_window = 0; |
d6345845 | 504 | ll->n_conflict = 0; |
e3dca008 | 505 | |
4dbf7b3a | 506 | r = sd_event_add_io(ll->event, &ll->receive_message_event_source, ll->fd, EPOLLIN, ipv4acd_on_packet, ll); |
e3dca008 | 507 | if (r < 0) |
d246e77a | 508 | goto fail; |
e3dca008 | 509 | |
4dbf7b3a | 510 | r = sd_event_source_set_priority(ll->receive_message_event_source, ll->event_priority); |
e3dca008 | 511 | if (r < 0) |
d246e77a | 512 | goto fail; |
e3dca008 | 513 | |
4dbf7b3a | 514 | (void) sd_event_source_set_description(ll->receive_message_event_source, "ipv4acd-receive-message"); |
e3dca008 TG |
515 | |
516 | r = ipv4acd_set_next_wakeup(ll, 0, 0); | |
517 | if (r < 0) | |
d246e77a | 518 | goto fail; |
e3dca008 | 519 | |
c9e458a4 | 520 | ipv4acd_set_state(ll, IPV4ACD_STATE_STARTED, true); |
e3dca008 | 521 | return 0; |
d246e77a LP |
522 | |
523 | fail: | |
524 | ipv4acd_reset(ll); | |
525 | return r; | |
e3dca008 | 526 | } |