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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
e3dca008 TG |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright (C) 2014 Axis Communications AB. All rights reserved. | |
6 | Copyright (C) 2015 Tom Gundersen | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <arpa/inet.h> | |
23 | #include <errno.h> | |
24 | #include <stdio.h> | |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
27 | ||
07630cea LP |
28 | #include "sd-ipv4acd.h" |
29 | ||
b5efdb8a | 30 | #include "alloc-util.h" |
07630cea | 31 | #include "arp-util.h" |
e78f9587 | 32 | #include "ether-addr-util.h" |
3ffd4af2 | 33 | #include "fd-util.h" |
e3dca008 TG |
34 | #include "in-addr-util.h" |
35 | #include "list.h" | |
e3dca008 TG |
36 | #include "random-util.h" |
37 | #include "siphash24.h" | |
d246e77a | 38 | #include "string-util.h" |
e3dca008 TG |
39 | #include "util.h" |
40 | ||
e3dca008 | 41 | /* Constants from the RFC */ |
e3f4eedb LP |
42 | #define PROBE_WAIT_USEC (1U * USEC_PER_SEC) |
43 | #define PROBE_NUM 3U | |
44 | #define PROBE_MIN_USEC (1U * USEC_PER_SEC) | |
45 | #define PROBE_MAX_USEC (2U * USEC_PER_SEC) | |
46 | #define ANNOUNCE_WAIT_USEC (2U * USEC_PER_SEC) | |
47 | #define ANNOUNCE_NUM 2U | |
48 | #define ANNOUNCE_INTERVAL_USEC (2U * USEC_PER_SEC) | |
49 | #define MAX_CONFLICTS 10U | |
50 | #define RATE_LIMIT_INTERVAL_USEC (60U * USEC_PER_SEC) | |
51 | #define DEFEND_INTERVAL_USEC (10U * USEC_PER_SEC) | |
e3dca008 | 52 | |
e3dca008 TG |
53 | typedef enum IPv4ACDState { |
54 | IPV4ACD_STATE_INIT, | |
c9e458a4 | 55 | IPV4ACD_STATE_STARTED, |
e3dca008 TG |
56 | IPV4ACD_STATE_WAITING_PROBE, |
57 | IPV4ACD_STATE_PROBING, | |
58 | IPV4ACD_STATE_WAITING_ANNOUNCE, | |
59 | IPV4ACD_STATE_ANNOUNCING, | |
60 | IPV4ACD_STATE_RUNNING, | |
61 | _IPV4ACD_STATE_MAX, | |
62 | _IPV4ACD_STATE_INVALID = -1 | |
63 | } IPv4ACDState; | |
64 | ||
65 | struct sd_ipv4acd { | |
c116f526 | 66 | unsigned n_ref; |
e3dca008 TG |
67 | |
68 | IPv4ACDState state; | |
2f8e7633 | 69 | int ifindex; |
e3dca008 | 70 | int fd; |
784cdc2d LP |
71 | |
72 | unsigned n_iteration; | |
73 | unsigned n_conflict; | |
74 | ||
4dbf7b3a LP |
75 | sd_event_source *receive_message_event_source; |
76 | sd_event_source *timer_event_source; | |
784cdc2d | 77 | |
e3dca008 TG |
78 | usec_t defend_window; |
79 | be32_t address; | |
784cdc2d | 80 | |
e3dca008 TG |
81 | /* External */ |
82 | struct ether_addr mac_addr; | |
784cdc2d | 83 | |
e3dca008 TG |
84 | sd_event *event; |
85 | int event_priority; | |
45aa74c7 | 86 | sd_ipv4acd_callback_t callback; |
e3dca008 TG |
87 | void* userdata; |
88 | }; | |
89 | ||
b24ef049 LP |
90 | #define log_ipv4acd_errno(acd, error, fmt, ...) log_internal(LOG_DEBUG, error, __FILE__, __LINE__, __func__, "IPV4ACD: " fmt, ##__VA_ARGS__) |
91 | #define log_ipv4acd(acd, fmt, ...) log_ipv4acd_errno(acd, 0, fmt, ##__VA_ARGS__) | |
3aacc173 | 92 | |
b24ef049 LP |
93 | static void ipv4acd_set_state(sd_ipv4acd *acd, IPv4ACDState st, bool reset_counter) { |
94 | assert(acd); | |
d246e77a LP |
95 | assert(st < _IPV4ACD_STATE_MAX); |
96 | ||
b24ef049 LP |
97 | if (st == acd->state && !reset_counter) |
98 | acd->n_iteration++; | |
d246e77a | 99 | else { |
b24ef049 LP |
100 | acd->state = st; |
101 | acd->n_iteration = 0; | |
d246e77a LP |
102 | } |
103 | } | |
104 | ||
b24ef049 LP |
105 | static void ipv4acd_reset(sd_ipv4acd *acd) { |
106 | assert(acd); | |
d246e77a | 107 | |
b24ef049 LP |
108 | acd->timer_event_source = sd_event_source_unref(acd->timer_event_source); |
109 | acd->receive_message_event_source = sd_event_source_unref(acd->receive_message_event_source); | |
d246e77a | 110 | |
b24ef049 | 111 | acd->fd = safe_close(acd->fd); |
d246e77a | 112 | |
b24ef049 | 113 | ipv4acd_set_state(acd, IPV4ACD_STATE_INIT, true); |
d246e77a LP |
114 | } |
115 | ||
b24ef049 LP |
116 | sd_ipv4acd *sd_ipv4acd_ref(sd_ipv4acd *acd) { |
117 | if (!acd) | |
c116f526 LP |
118 | return NULL; |
119 | ||
b24ef049 LP |
120 | assert_se(acd->n_ref >= 1); |
121 | acd->n_ref++; | |
e3dca008 | 122 | |
b24ef049 | 123 | return acd; |
e3dca008 TG |
124 | } |
125 | ||
b24ef049 LP |
126 | sd_ipv4acd *sd_ipv4acd_unref(sd_ipv4acd *acd) { |
127 | if (!acd) | |
c116f526 LP |
128 | return NULL; |
129 | ||
b24ef049 LP |
130 | assert_se(acd->n_ref >= 1); |
131 | acd->n_ref--; | |
c116f526 | 132 | |
b24ef049 | 133 | if (acd->n_ref > 0) |
e3dca008 TG |
134 | return NULL; |
135 | ||
b24ef049 LP |
136 | ipv4acd_reset(acd); |
137 | sd_ipv4acd_detach_event(acd); | |
e3dca008 | 138 | |
6b430fdb | 139 | return mfree(acd); |
e3dca008 TG |
140 | } |
141 | ||
e3dca008 | 142 | int sd_ipv4acd_new(sd_ipv4acd **ret) { |
b24ef049 | 143 | _cleanup_(sd_ipv4acd_unrefp) sd_ipv4acd *acd = NULL; |
e3dca008 TG |
144 | |
145 | assert_return(ret, -EINVAL); | |
146 | ||
b24ef049 LP |
147 | acd = new0(sd_ipv4acd, 1); |
148 | if (!acd) | |
e3dca008 TG |
149 | return -ENOMEM; |
150 | ||
b24ef049 LP |
151 | acd->n_ref = 1; |
152 | acd->state = IPV4ACD_STATE_INIT; | |
153 | acd->ifindex = -1; | |
154 | acd->fd = -1; | |
e3dca008 | 155 | |
b24ef049 LP |
156 | *ret = acd; |
157 | acd = NULL; | |
e3dca008 TG |
158 | |
159 | return 0; | |
160 | } | |
161 | ||
b24ef049 LP |
162 | static void ipv4acd_client_notify(sd_ipv4acd *acd, int event) { |
163 | assert(acd); | |
e3dca008 | 164 | |
b24ef049 | 165 | if (!acd->callback) |
e095f51d LP |
166 | return; |
167 | ||
b24ef049 | 168 | acd->callback(acd, event, acd->userdata); |
e3dca008 TG |
169 | } |
170 | ||
b24ef049 LP |
171 | int sd_ipv4acd_stop(sd_ipv4acd *acd) { |
172 | assert_return(acd, -EINVAL); | |
e3dca008 | 173 | |
b24ef049 | 174 | ipv4acd_reset(acd); |
e3dca008 | 175 | |
b24ef049 | 176 | log_ipv4acd(acd, "STOPPED"); |
e3dca008 | 177 | |
b24ef049 | 178 | ipv4acd_client_notify(acd, SD_IPV4ACD_EVENT_STOP); |
e3dca008 TG |
179 | |
180 | return 0; | |
181 | } | |
182 | ||
183 | static int ipv4acd_on_timeout(sd_event_source *s, uint64_t usec, void *userdata); | |
184 | ||
b24ef049 | 185 | static int ipv4acd_set_next_wakeup(sd_ipv4acd *acd, usec_t usec, usec_t random_usec) { |
4afd3348 | 186 | _cleanup_(sd_event_source_unrefp) sd_event_source *timer = NULL; |
e3f4eedb | 187 | usec_t next_timeout, time_now; |
e3dca008 TG |
188 | int r; |
189 | ||
b24ef049 | 190 | assert(acd); |
e3dca008 | 191 | |
e3f4eedb | 192 | next_timeout = usec; |
e3dca008 | 193 | |
e3f4eedb LP |
194 | if (random_usec > 0) |
195 | next_timeout += (usec_t) random_u64() % random_usec; | |
e3dca008 | 196 | |
b24ef049 | 197 | assert_se(sd_event_now(acd->event, clock_boottime_or_monotonic(), &time_now) >= 0); |
e3dca008 | 198 | |
b24ef049 | 199 | r = sd_event_add_time(acd->event, &timer, clock_boottime_or_monotonic(), time_now + next_timeout, 0, ipv4acd_on_timeout, acd); |
e3dca008 TG |
200 | if (r < 0) |
201 | return r; | |
202 | ||
b24ef049 | 203 | r = sd_event_source_set_priority(timer, acd->event_priority); |
e3dca008 TG |
204 | if (r < 0) |
205 | return r; | |
206 | ||
4dbf7b3a | 207 | (void) sd_event_source_set_description(timer, "ipv4acd-timer"); |
e3dca008 | 208 | |
b24ef049 LP |
209 | sd_event_source_unref(acd->timer_event_source); |
210 | acd->timer_event_source = timer; | |
e3dca008 TG |
211 | timer = NULL; |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
b24ef049 LP |
216 | static bool ipv4acd_arp_conflict(sd_ipv4acd *acd, struct ether_arp *arp) { |
217 | assert(acd); | |
e3dca008 TG |
218 | assert(arp); |
219 | ||
220 | /* see the BPF */ | |
b24ef049 | 221 | if (memcmp(arp->arp_spa, &acd->address, sizeof(acd->address)) == 0) |
e3dca008 TG |
222 | return true; |
223 | ||
224 | /* the TPA matched instead of the SPA, this is not a conflict */ | |
225 | return false; | |
226 | } | |
227 | ||
228 | static int ipv4acd_on_timeout(sd_event_source *s, uint64_t usec, void *userdata) { | |
b24ef049 | 229 | sd_ipv4acd *acd = userdata; |
e3dca008 TG |
230 | int r = 0; |
231 | ||
b24ef049 | 232 | assert(acd); |
e3dca008 | 233 | |
b24ef049 | 234 | switch (acd->state) { |
e3dca008 | 235 | |
c9e458a4 | 236 | case IPV4ACD_STATE_STARTED: |
b24ef049 | 237 | ipv4acd_set_state(acd, IPV4ACD_STATE_WAITING_PROBE, true); |
e3dca008 | 238 | |
b24ef049 | 239 | if (acd->n_conflict >= MAX_CONFLICTS) { |
e3f4eedb | 240 | char ts[FORMAT_TIMESPAN_MAX]; |
b24ef049 | 241 | log_ipv4acd(acd, "Max conflicts reached, delaying by %s", format_timespan(ts, sizeof(ts), RATE_LIMIT_INTERVAL_USEC, 0)); |
a48fc60a | 242 | |
b24ef049 | 243 | r = ipv4acd_set_next_wakeup(acd, RATE_LIMIT_INTERVAL_USEC, PROBE_WAIT_USEC); |
e3dca008 | 244 | if (r < 0) |
ff0c5ebd | 245 | goto fail; |
e3dca008 | 246 | } else { |
b24ef049 | 247 | r = ipv4acd_set_next_wakeup(acd, 0, PROBE_WAIT_USEC); |
e3dca008 | 248 | if (r < 0) |
ff0c5ebd | 249 | goto fail; |
e3dca008 TG |
250 | } |
251 | ||
252 | break; | |
4dbf7b3a | 253 | |
e3dca008 TG |
254 | case IPV4ACD_STATE_WAITING_PROBE: |
255 | case IPV4ACD_STATE_PROBING: | |
256 | /* Send a probe */ | |
b24ef049 | 257 | r = arp_send_probe(acd->fd, acd->ifindex, acd->address, &acd->mac_addr); |
e3dca008 | 258 | if (r < 0) { |
b24ef049 | 259 | log_ipv4acd_errno(acd, r, "Failed to send ARP probe: %m"); |
ff0c5ebd | 260 | goto fail; |
e3dca008 TG |
261 | } else { |
262 | _cleanup_free_ char *address = NULL; | |
b24ef049 | 263 | union in_addr_union addr = { .in.s_addr = acd->address }; |
e3dca008 | 264 | |
d246e77a | 265 | (void) in_addr_to_string(AF_INET, &addr, &address); |
b24ef049 | 266 | log_ipv4acd(acd, "Probing %s", strna(address)); |
e3dca008 TG |
267 | } |
268 | ||
b24ef049 LP |
269 | if (acd->n_iteration < PROBE_NUM - 2) { |
270 | ipv4acd_set_state(acd, IPV4ACD_STATE_PROBING, false); | |
e3dca008 | 271 | |
b24ef049 | 272 | r = ipv4acd_set_next_wakeup(acd, PROBE_MIN_USEC, (PROBE_MAX_USEC-PROBE_MIN_USEC)); |
e3dca008 | 273 | if (r < 0) |
ff0c5ebd | 274 | goto fail; |
e3dca008 | 275 | } else { |
b24ef049 | 276 | ipv4acd_set_state(acd, IPV4ACD_STATE_WAITING_ANNOUNCE, true); |
e3dca008 | 277 | |
b24ef049 | 278 | r = ipv4acd_set_next_wakeup(acd, ANNOUNCE_WAIT_USEC, 0); |
e3dca008 | 279 | if (r < 0) |
ff0c5ebd | 280 | goto fail; |
e3dca008 TG |
281 | } |
282 | ||
283 | break; | |
284 | ||
285 | case IPV4ACD_STATE_ANNOUNCING: | |
b24ef049 LP |
286 | if (acd->n_iteration >= ANNOUNCE_NUM - 1) { |
287 | ipv4acd_set_state(acd, IPV4ACD_STATE_RUNNING, false); | |
e3dca008 TG |
288 | break; |
289 | } | |
4dbf7b3a | 290 | |
4831981d | 291 | _fallthrough_; |
e3dca008 TG |
292 | case IPV4ACD_STATE_WAITING_ANNOUNCE: |
293 | /* Send announcement packet */ | |
b24ef049 | 294 | r = arp_send_announcement(acd->fd, acd->ifindex, acd->address, &acd->mac_addr); |
e3dca008 | 295 | if (r < 0) { |
b24ef049 | 296 | log_ipv4acd_errno(acd, r, "Failed to send ARP announcement: %m"); |
ff0c5ebd | 297 | goto fail; |
e3dca008 | 298 | } else |
b24ef049 | 299 | log_ipv4acd(acd, "ANNOUNCE"); |
e3dca008 | 300 | |
b24ef049 | 301 | ipv4acd_set_state(acd, IPV4ACD_STATE_ANNOUNCING, false); |
e3dca008 | 302 | |
b24ef049 | 303 | r = ipv4acd_set_next_wakeup(acd, ANNOUNCE_INTERVAL_USEC, 0); |
e3dca008 | 304 | if (r < 0) |
ff0c5ebd | 305 | goto fail; |
e3dca008 | 306 | |
b24ef049 LP |
307 | if (acd->n_iteration == 0) { |
308 | acd->n_conflict = 0; | |
309 | ipv4acd_client_notify(acd, SD_IPV4ACD_EVENT_BIND); | |
e3dca008 TG |
310 | } |
311 | ||
312 | break; | |
4dbf7b3a | 313 | |
e3dca008 TG |
314 | default: |
315 | assert_not_reached("Invalid state."); | |
316 | } | |
317 | ||
ff0c5ebd | 318 | return 0; |
e3dca008 | 319 | |
ff0c5ebd | 320 | fail: |
b24ef049 | 321 | sd_ipv4acd_stop(acd); |
ff0c5ebd | 322 | return 0; |
e3dca008 TG |
323 | } |
324 | ||
b24ef049 | 325 | static void ipv4acd_on_conflict(sd_ipv4acd *acd) { |
e3dca008 | 326 | _cleanup_free_ char *address = NULL; |
b24ef049 | 327 | union in_addr_union addr = { .in.s_addr = acd->address }; |
e3dca008 | 328 | |
b24ef049 | 329 | assert(acd); |
e3dca008 | 330 | |
b24ef049 | 331 | acd->n_conflict++; |
e3dca008 | 332 | |
d246e77a | 333 | (void) in_addr_to_string(AF_INET, &addr, &address); |
b24ef049 | 334 | log_ipv4acd(acd, "Conflict on %s (%u)", strna(address), acd->n_conflict); |
e3dca008 | 335 | |
b24ef049 LP |
336 | ipv4acd_reset(acd); |
337 | ipv4acd_client_notify(acd, SD_IPV4ACD_EVENT_CONFLICT); | |
e3dca008 TG |
338 | } |
339 | ||
e095f51d LP |
340 | static int ipv4acd_on_packet( |
341 | sd_event_source *s, | |
342 | int fd, | |
343 | uint32_t revents, | |
344 | void *userdata) { | |
345 | ||
b24ef049 | 346 | sd_ipv4acd *acd = userdata; |
e3dca008 | 347 | struct ether_arp packet; |
e095f51d | 348 | ssize_t n; |
e3dca008 TG |
349 | int r; |
350 | ||
e095f51d | 351 | assert(s); |
b24ef049 | 352 | assert(acd); |
e3dca008 TG |
353 | assert(fd >= 0); |
354 | ||
e095f51d LP |
355 | n = recv(fd, &packet, sizeof(struct ether_arp), 0); |
356 | if (n < 0) { | |
3742095b | 357 | if (IN_SET(errno, EAGAIN, EINTR)) |
004845d1 LP |
358 | return 0; |
359 | ||
b24ef049 | 360 | log_ipv4acd_errno(acd, errno, "Failed to read ARP packet: %m"); |
ff0c5ebd | 361 | goto fail; |
e095f51d LP |
362 | } |
363 | if ((size_t) n != sizeof(struct ether_arp)) { | |
b24ef049 | 364 | log_ipv4acd(acd, "Ignoring too short ARP packet."); |
e095f51d LP |
365 | return 0; |
366 | } | |
e3dca008 | 367 | |
b24ef049 | 368 | switch (acd->state) { |
e095f51d | 369 | |
e3dca008 TG |
370 | case IPV4ACD_STATE_ANNOUNCING: |
371 | case IPV4ACD_STATE_RUNNING: | |
e095f51d | 372 | |
b24ef049 | 373 | if (ipv4acd_arp_conflict(acd, &packet)) { |
e3dca008 TG |
374 | usec_t ts; |
375 | ||
b24ef049 | 376 | assert_se(sd_event_now(acd->event, clock_boottime_or_monotonic(), &ts) >= 0); |
e3dca008 TG |
377 | |
378 | /* Defend address */ | |
b24ef049 LP |
379 | if (ts > acd->defend_window) { |
380 | acd->defend_window = ts + DEFEND_INTERVAL_USEC; | |
381 | r = arp_send_announcement(acd->fd, acd->ifindex, acd->address, &acd->mac_addr); | |
e3dca008 | 382 | if (r < 0) { |
b24ef049 | 383 | log_ipv4acd_errno(acd, r, "Failed to send ARP announcement: %m"); |
ff0c5ebd | 384 | goto fail; |
e3dca008 | 385 | } else |
b24ef049 | 386 | log_ipv4acd(acd, "DEFEND"); |
e3dca008 TG |
387 | |
388 | } else | |
b24ef049 | 389 | ipv4acd_on_conflict(acd); |
e3dca008 | 390 | } |
e3dca008 | 391 | break; |
e095f51d | 392 | |
e3dca008 TG |
393 | case IPV4ACD_STATE_WAITING_PROBE: |
394 | case IPV4ACD_STATE_PROBING: | |
395 | case IPV4ACD_STATE_WAITING_ANNOUNCE: | |
396 | /* BPF ensures this packet indicates a conflict */ | |
b24ef049 | 397 | ipv4acd_on_conflict(acd); |
e3dca008 | 398 | break; |
e095f51d | 399 | |
e3dca008 TG |
400 | default: |
401 | assert_not_reached("Invalid state."); | |
402 | } | |
403 | ||
ff0c5ebd | 404 | return 0; |
e3dca008 | 405 | |
ff0c5ebd | 406 | fail: |
b24ef049 | 407 | sd_ipv4acd_stop(acd); |
ff0c5ebd | 408 | return 0; |
e3dca008 TG |
409 | } |
410 | ||
b24ef049 LP |
411 | int sd_ipv4acd_set_ifindex(sd_ipv4acd *acd, int ifindex) { |
412 | assert_return(acd, -EINVAL); | |
2f8e7633 | 413 | assert_return(ifindex > 0, -EINVAL); |
b24ef049 | 414 | assert_return(acd->state == IPV4ACD_STATE_INIT, -EBUSY); |
e3dca008 | 415 | |
b24ef049 | 416 | acd->ifindex = ifindex; |
e3dca008 TG |
417 | |
418 | return 0; | |
419 | } | |
420 | ||
b24ef049 LP |
421 | int sd_ipv4acd_set_mac(sd_ipv4acd *acd, const struct ether_addr *addr) { |
422 | assert_return(acd, -EINVAL); | |
e3dca008 | 423 | assert_return(addr, -EINVAL); |
b24ef049 | 424 | assert_return(acd->state == IPV4ACD_STATE_INIT, -EBUSY); |
e3dca008 | 425 | |
b24ef049 | 426 | acd->mac_addr = *addr; |
e3dca008 TG |
427 | |
428 | return 0; | |
429 | } | |
430 | ||
b24ef049 LP |
431 | int sd_ipv4acd_detach_event(sd_ipv4acd *acd) { |
432 | assert_return(acd, -EINVAL); | |
e3dca008 | 433 | |
b24ef049 | 434 | acd->event = sd_event_unref(acd->event); |
e3dca008 TG |
435 | |
436 | return 0; | |
437 | } | |
438 | ||
b24ef049 | 439 | int sd_ipv4acd_attach_event(sd_ipv4acd *acd, sd_event *event, int64_t priority) { |
e3dca008 TG |
440 | int r; |
441 | ||
b24ef049 LP |
442 | assert_return(acd, -EINVAL); |
443 | assert_return(!acd->event, -EBUSY); | |
e3dca008 TG |
444 | |
445 | if (event) | |
b24ef049 | 446 | acd->event = sd_event_ref(event); |
e3dca008 | 447 | else { |
b24ef049 | 448 | r = sd_event_default(&acd->event); |
e3dca008 TG |
449 | if (r < 0) |
450 | return r; | |
451 | } | |
452 | ||
b24ef049 | 453 | acd->event_priority = priority; |
e3dca008 TG |
454 | |
455 | return 0; | |
456 | } | |
457 | ||
b24ef049 LP |
458 | int sd_ipv4acd_set_callback(sd_ipv4acd *acd, sd_ipv4acd_callback_t cb, void *userdata) { |
459 | assert_return(acd, -EINVAL); | |
e3dca008 | 460 | |
b24ef049 LP |
461 | acd->callback = cb; |
462 | acd->userdata = userdata; | |
e3dca008 TG |
463 | |
464 | return 0; | |
465 | } | |
466 | ||
b24ef049 LP |
467 | int sd_ipv4acd_set_address(sd_ipv4acd *acd, const struct in_addr *address) { |
468 | assert_return(acd, -EINVAL); | |
e3dca008 | 469 | assert_return(address, -EINVAL); |
b24ef049 | 470 | assert_return(acd->state == IPV4ACD_STATE_INIT, -EBUSY); |
e3dca008 | 471 | |
b24ef049 | 472 | acd->address = address->s_addr; |
e3dca008 TG |
473 | |
474 | return 0; | |
475 | } | |
476 | ||
b24ef049 LP |
477 | int sd_ipv4acd_is_running(sd_ipv4acd *acd) { |
478 | assert_return(acd, false); | |
e3dca008 | 479 | |
b24ef049 | 480 | return acd->state != IPV4ACD_STATE_INIT; |
e3dca008 TG |
481 | } |
482 | ||
b24ef049 | 483 | int sd_ipv4acd_start(sd_ipv4acd *acd) { |
e3dca008 TG |
484 | int r; |
485 | ||
b24ef049 LP |
486 | assert_return(acd, -EINVAL); |
487 | assert_return(acd->event, -EINVAL); | |
488 | assert_return(acd->ifindex > 0, -EINVAL); | |
489 | assert_return(acd->address != 0, -EINVAL); | |
490 | assert_return(!ether_addr_is_null(&acd->mac_addr), -EINVAL); | |
491 | assert_return(acd->state == IPV4ACD_STATE_INIT, -EBUSY); | |
e3dca008 | 492 | |
b24ef049 | 493 | r = arp_network_bind_raw_socket(acd->ifindex, acd->address, &acd->mac_addr); |
e3dca008 | 494 | if (r < 0) |
d246e77a | 495 | return r; |
e3dca008 | 496 | |
b24ef049 LP |
497 | safe_close(acd->fd); |
498 | acd->fd = r; | |
499 | acd->defend_window = 0; | |
500 | acd->n_conflict = 0; | |
e3dca008 | 501 | |
b24ef049 | 502 | r = sd_event_add_io(acd->event, &acd->receive_message_event_source, acd->fd, EPOLLIN, ipv4acd_on_packet, acd); |
e3dca008 | 503 | if (r < 0) |
d246e77a | 504 | goto fail; |
e3dca008 | 505 | |
b24ef049 | 506 | r = sd_event_source_set_priority(acd->receive_message_event_source, acd->event_priority); |
e3dca008 | 507 | if (r < 0) |
d246e77a | 508 | goto fail; |
e3dca008 | 509 | |
b24ef049 | 510 | (void) sd_event_source_set_description(acd->receive_message_event_source, "ipv4acd-receive-message"); |
e3dca008 | 511 | |
b24ef049 | 512 | r = ipv4acd_set_next_wakeup(acd, 0, 0); |
e3dca008 | 513 | if (r < 0) |
d246e77a | 514 | goto fail; |
e3dca008 | 515 | |
b24ef049 | 516 | ipv4acd_set_state(acd, IPV4ACD_STATE_STARTED, true); |
e3dca008 | 517 | return 0; |
d246e77a LP |
518 | |
519 | fail: | |
b24ef049 | 520 | ipv4acd_reset(acd); |
d246e77a | 521 | return r; |
e3dca008 | 522 | } |