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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 | |
e3dca008 TG |
7 | ***/ |
8 | ||
9 | #include <arpa/inet.h> | |
10 | #include <errno.h> | |
11 | #include <stdio.h> | |
12 | #include <stdlib.h> | |
13 | #include <string.h> | |
14 | ||
07630cea LP |
15 | #include "sd-ipv4acd.h" |
16 | ||
b5efdb8a | 17 | #include "alloc-util.h" |
07630cea | 18 | #include "arp-util.h" |
e78f9587 | 19 | #include "ether-addr-util.h" |
3ffd4af2 | 20 | #include "fd-util.h" |
e3dca008 TG |
21 | #include "in-addr-util.h" |
22 | #include "list.h" | |
e3dca008 TG |
23 | #include "random-util.h" |
24 | #include "siphash24.h" | |
d246e77a | 25 | #include "string-util.h" |
e3dca008 TG |
26 | #include "util.h" |
27 | ||
e3dca008 | 28 | /* Constants from the RFC */ |
e3f4eedb LP |
29 | #define PROBE_WAIT_USEC (1U * USEC_PER_SEC) |
30 | #define PROBE_NUM 3U | |
31 | #define PROBE_MIN_USEC (1U * USEC_PER_SEC) | |
32 | #define PROBE_MAX_USEC (2U * USEC_PER_SEC) | |
33 | #define ANNOUNCE_WAIT_USEC (2U * USEC_PER_SEC) | |
34 | #define ANNOUNCE_NUM 2U | |
35 | #define ANNOUNCE_INTERVAL_USEC (2U * USEC_PER_SEC) | |
36 | #define MAX_CONFLICTS 10U | |
37 | #define RATE_LIMIT_INTERVAL_USEC (60U * USEC_PER_SEC) | |
38 | #define DEFEND_INTERVAL_USEC (10U * USEC_PER_SEC) | |
e3dca008 | 39 | |
e3dca008 TG |
40 | typedef enum IPv4ACDState { |
41 | IPV4ACD_STATE_INIT, | |
c9e458a4 | 42 | IPV4ACD_STATE_STARTED, |
e3dca008 TG |
43 | IPV4ACD_STATE_WAITING_PROBE, |
44 | IPV4ACD_STATE_PROBING, | |
45 | IPV4ACD_STATE_WAITING_ANNOUNCE, | |
46 | IPV4ACD_STATE_ANNOUNCING, | |
47 | IPV4ACD_STATE_RUNNING, | |
48 | _IPV4ACD_STATE_MAX, | |
49 | _IPV4ACD_STATE_INVALID = -1 | |
50 | } IPv4ACDState; | |
51 | ||
52 | struct sd_ipv4acd { | |
c116f526 | 53 | unsigned n_ref; |
e3dca008 TG |
54 | |
55 | IPv4ACDState state; | |
2f8e7633 | 56 | int ifindex; |
e3dca008 | 57 | int fd; |
784cdc2d LP |
58 | |
59 | unsigned n_iteration; | |
60 | unsigned n_conflict; | |
61 | ||
4dbf7b3a LP |
62 | sd_event_source *receive_message_event_source; |
63 | sd_event_source *timer_event_source; | |
784cdc2d | 64 | |
e3dca008 TG |
65 | usec_t defend_window; |
66 | be32_t address; | |
784cdc2d | 67 | |
e3dca008 TG |
68 | /* External */ |
69 | struct ether_addr mac_addr; | |
784cdc2d | 70 | |
e3dca008 TG |
71 | sd_event *event; |
72 | int event_priority; | |
45aa74c7 | 73 | sd_ipv4acd_callback_t callback; |
e3dca008 TG |
74 | void* userdata; |
75 | }; | |
76 | ||
b24ef049 LP |
77 | #define log_ipv4acd_errno(acd, error, fmt, ...) log_internal(LOG_DEBUG, error, __FILE__, __LINE__, __func__, "IPV4ACD: " fmt, ##__VA_ARGS__) |
78 | #define log_ipv4acd(acd, fmt, ...) log_ipv4acd_errno(acd, 0, fmt, ##__VA_ARGS__) | |
3aacc173 | 79 | |
b24ef049 LP |
80 | static void ipv4acd_set_state(sd_ipv4acd *acd, IPv4ACDState st, bool reset_counter) { |
81 | assert(acd); | |
d246e77a LP |
82 | assert(st < _IPV4ACD_STATE_MAX); |
83 | ||
b24ef049 LP |
84 | if (st == acd->state && !reset_counter) |
85 | acd->n_iteration++; | |
d246e77a | 86 | else { |
b24ef049 LP |
87 | acd->state = st; |
88 | acd->n_iteration = 0; | |
d246e77a LP |
89 | } |
90 | } | |
91 | ||
b24ef049 LP |
92 | static void ipv4acd_reset(sd_ipv4acd *acd) { |
93 | assert(acd); | |
d246e77a | 94 | |
b24ef049 LP |
95 | acd->timer_event_source = sd_event_source_unref(acd->timer_event_source); |
96 | acd->receive_message_event_source = sd_event_source_unref(acd->receive_message_event_source); | |
d246e77a | 97 | |
b24ef049 | 98 | acd->fd = safe_close(acd->fd); |
d246e77a | 99 | |
b24ef049 | 100 | ipv4acd_set_state(acd, IPV4ACD_STATE_INIT, true); |
d246e77a LP |
101 | } |
102 | ||
b24ef049 LP |
103 | sd_ipv4acd *sd_ipv4acd_ref(sd_ipv4acd *acd) { |
104 | if (!acd) | |
c116f526 LP |
105 | return NULL; |
106 | ||
b24ef049 LP |
107 | assert_se(acd->n_ref >= 1); |
108 | acd->n_ref++; | |
e3dca008 | 109 | |
b24ef049 | 110 | return acd; |
e3dca008 TG |
111 | } |
112 | ||
b24ef049 LP |
113 | sd_ipv4acd *sd_ipv4acd_unref(sd_ipv4acd *acd) { |
114 | if (!acd) | |
c116f526 LP |
115 | return NULL; |
116 | ||
b24ef049 LP |
117 | assert_se(acd->n_ref >= 1); |
118 | acd->n_ref--; | |
c116f526 | 119 | |
b24ef049 | 120 | if (acd->n_ref > 0) |
e3dca008 TG |
121 | return NULL; |
122 | ||
b24ef049 LP |
123 | ipv4acd_reset(acd); |
124 | sd_ipv4acd_detach_event(acd); | |
e3dca008 | 125 | |
6b430fdb | 126 | return mfree(acd); |
e3dca008 TG |
127 | } |
128 | ||
e3dca008 | 129 | int sd_ipv4acd_new(sd_ipv4acd **ret) { |
b24ef049 | 130 | _cleanup_(sd_ipv4acd_unrefp) sd_ipv4acd *acd = NULL; |
e3dca008 TG |
131 | |
132 | assert_return(ret, -EINVAL); | |
133 | ||
b24ef049 LP |
134 | acd = new0(sd_ipv4acd, 1); |
135 | if (!acd) | |
e3dca008 TG |
136 | return -ENOMEM; |
137 | ||
b24ef049 LP |
138 | acd->n_ref = 1; |
139 | acd->state = IPV4ACD_STATE_INIT; | |
140 | acd->ifindex = -1; | |
141 | acd->fd = -1; | |
e3dca008 | 142 | |
1cc6c93a | 143 | *ret = TAKE_PTR(acd); |
e3dca008 TG |
144 | |
145 | return 0; | |
146 | } | |
147 | ||
b24ef049 LP |
148 | static void ipv4acd_client_notify(sd_ipv4acd *acd, int event) { |
149 | assert(acd); | |
e3dca008 | 150 | |
b24ef049 | 151 | if (!acd->callback) |
e095f51d LP |
152 | return; |
153 | ||
b24ef049 | 154 | acd->callback(acd, event, acd->userdata); |
e3dca008 TG |
155 | } |
156 | ||
b24ef049 LP |
157 | int sd_ipv4acd_stop(sd_ipv4acd *acd) { |
158 | assert_return(acd, -EINVAL); | |
e3dca008 | 159 | |
b24ef049 | 160 | ipv4acd_reset(acd); |
e3dca008 | 161 | |
b24ef049 | 162 | log_ipv4acd(acd, "STOPPED"); |
e3dca008 | 163 | |
b24ef049 | 164 | ipv4acd_client_notify(acd, SD_IPV4ACD_EVENT_STOP); |
e3dca008 TG |
165 | |
166 | return 0; | |
167 | } | |
168 | ||
169 | static int ipv4acd_on_timeout(sd_event_source *s, uint64_t usec, void *userdata); | |
170 | ||
b24ef049 | 171 | static int ipv4acd_set_next_wakeup(sd_ipv4acd *acd, usec_t usec, usec_t random_usec) { |
4afd3348 | 172 | _cleanup_(sd_event_source_unrefp) sd_event_source *timer = NULL; |
e3f4eedb | 173 | usec_t next_timeout, time_now; |
e3dca008 TG |
174 | int r; |
175 | ||
b24ef049 | 176 | assert(acd); |
e3dca008 | 177 | |
e3f4eedb | 178 | next_timeout = usec; |
e3dca008 | 179 | |
e3f4eedb LP |
180 | if (random_usec > 0) |
181 | next_timeout += (usec_t) random_u64() % random_usec; | |
e3dca008 | 182 | |
b24ef049 | 183 | assert_se(sd_event_now(acd->event, clock_boottime_or_monotonic(), &time_now) >= 0); |
e3dca008 | 184 | |
b24ef049 | 185 | r = sd_event_add_time(acd->event, &timer, clock_boottime_or_monotonic(), time_now + next_timeout, 0, ipv4acd_on_timeout, acd); |
e3dca008 TG |
186 | if (r < 0) |
187 | return r; | |
188 | ||
b24ef049 | 189 | r = sd_event_source_set_priority(timer, acd->event_priority); |
e3dca008 TG |
190 | if (r < 0) |
191 | return r; | |
192 | ||
4dbf7b3a | 193 | (void) sd_event_source_set_description(timer, "ipv4acd-timer"); |
e3dca008 | 194 | |
b24ef049 | 195 | sd_event_source_unref(acd->timer_event_source); |
1cc6c93a | 196 | acd->timer_event_source = TAKE_PTR(timer); |
e3dca008 TG |
197 | |
198 | return 0; | |
199 | } | |
200 | ||
b24ef049 LP |
201 | static bool ipv4acd_arp_conflict(sd_ipv4acd *acd, struct ether_arp *arp) { |
202 | assert(acd); | |
e3dca008 TG |
203 | assert(arp); |
204 | ||
205 | /* see the BPF */ | |
b24ef049 | 206 | if (memcmp(arp->arp_spa, &acd->address, sizeof(acd->address)) == 0) |
e3dca008 TG |
207 | return true; |
208 | ||
209 | /* the TPA matched instead of the SPA, this is not a conflict */ | |
210 | return false; | |
211 | } | |
212 | ||
213 | static int ipv4acd_on_timeout(sd_event_source *s, uint64_t usec, void *userdata) { | |
b24ef049 | 214 | sd_ipv4acd *acd = userdata; |
e3dca008 TG |
215 | int r = 0; |
216 | ||
b24ef049 | 217 | assert(acd); |
e3dca008 | 218 | |
b24ef049 | 219 | switch (acd->state) { |
e3dca008 | 220 | |
c9e458a4 | 221 | case IPV4ACD_STATE_STARTED: |
b24ef049 | 222 | ipv4acd_set_state(acd, IPV4ACD_STATE_WAITING_PROBE, true); |
e3dca008 | 223 | |
b24ef049 | 224 | if (acd->n_conflict >= MAX_CONFLICTS) { |
e3f4eedb | 225 | char ts[FORMAT_TIMESPAN_MAX]; |
b24ef049 | 226 | log_ipv4acd(acd, "Max conflicts reached, delaying by %s", format_timespan(ts, sizeof(ts), RATE_LIMIT_INTERVAL_USEC, 0)); |
a48fc60a | 227 | |
b24ef049 | 228 | r = ipv4acd_set_next_wakeup(acd, RATE_LIMIT_INTERVAL_USEC, PROBE_WAIT_USEC); |
e3dca008 | 229 | if (r < 0) |
ff0c5ebd | 230 | goto fail; |
e3dca008 | 231 | } else { |
b24ef049 | 232 | r = ipv4acd_set_next_wakeup(acd, 0, PROBE_WAIT_USEC); |
e3dca008 | 233 | if (r < 0) |
ff0c5ebd | 234 | goto fail; |
e3dca008 TG |
235 | } |
236 | ||
237 | break; | |
4dbf7b3a | 238 | |
e3dca008 TG |
239 | case IPV4ACD_STATE_WAITING_PROBE: |
240 | case IPV4ACD_STATE_PROBING: | |
241 | /* Send a probe */ | |
b24ef049 | 242 | r = arp_send_probe(acd->fd, acd->ifindex, acd->address, &acd->mac_addr); |
e3dca008 | 243 | if (r < 0) { |
b24ef049 | 244 | log_ipv4acd_errno(acd, r, "Failed to send ARP probe: %m"); |
ff0c5ebd | 245 | goto fail; |
e3dca008 TG |
246 | } else { |
247 | _cleanup_free_ char *address = NULL; | |
b24ef049 | 248 | union in_addr_union addr = { .in.s_addr = acd->address }; |
e3dca008 | 249 | |
d246e77a | 250 | (void) in_addr_to_string(AF_INET, &addr, &address); |
b24ef049 | 251 | log_ipv4acd(acd, "Probing %s", strna(address)); |
e3dca008 TG |
252 | } |
253 | ||
b24ef049 LP |
254 | if (acd->n_iteration < PROBE_NUM - 2) { |
255 | ipv4acd_set_state(acd, IPV4ACD_STATE_PROBING, false); | |
e3dca008 | 256 | |
b24ef049 | 257 | r = ipv4acd_set_next_wakeup(acd, PROBE_MIN_USEC, (PROBE_MAX_USEC-PROBE_MIN_USEC)); |
e3dca008 | 258 | if (r < 0) |
ff0c5ebd | 259 | goto fail; |
e3dca008 | 260 | } else { |
b24ef049 | 261 | ipv4acd_set_state(acd, IPV4ACD_STATE_WAITING_ANNOUNCE, true); |
e3dca008 | 262 | |
b24ef049 | 263 | r = ipv4acd_set_next_wakeup(acd, ANNOUNCE_WAIT_USEC, 0); |
e3dca008 | 264 | if (r < 0) |
ff0c5ebd | 265 | goto fail; |
e3dca008 TG |
266 | } |
267 | ||
268 | break; | |
269 | ||
270 | case IPV4ACD_STATE_ANNOUNCING: | |
b24ef049 LP |
271 | if (acd->n_iteration >= ANNOUNCE_NUM - 1) { |
272 | ipv4acd_set_state(acd, IPV4ACD_STATE_RUNNING, false); | |
e3dca008 TG |
273 | break; |
274 | } | |
4dbf7b3a | 275 | |
4831981d | 276 | _fallthrough_; |
e3dca008 TG |
277 | case IPV4ACD_STATE_WAITING_ANNOUNCE: |
278 | /* Send announcement packet */ | |
b24ef049 | 279 | r = arp_send_announcement(acd->fd, acd->ifindex, acd->address, &acd->mac_addr); |
e3dca008 | 280 | if (r < 0) { |
b24ef049 | 281 | log_ipv4acd_errno(acd, r, "Failed to send ARP announcement: %m"); |
ff0c5ebd | 282 | goto fail; |
e3dca008 | 283 | } else |
b24ef049 | 284 | log_ipv4acd(acd, "ANNOUNCE"); |
e3dca008 | 285 | |
b24ef049 | 286 | ipv4acd_set_state(acd, IPV4ACD_STATE_ANNOUNCING, false); |
e3dca008 | 287 | |
b24ef049 | 288 | r = ipv4acd_set_next_wakeup(acd, ANNOUNCE_INTERVAL_USEC, 0); |
e3dca008 | 289 | if (r < 0) |
ff0c5ebd | 290 | goto fail; |
e3dca008 | 291 | |
b24ef049 LP |
292 | if (acd->n_iteration == 0) { |
293 | acd->n_conflict = 0; | |
294 | ipv4acd_client_notify(acd, SD_IPV4ACD_EVENT_BIND); | |
e3dca008 TG |
295 | } |
296 | ||
297 | break; | |
4dbf7b3a | 298 | |
e3dca008 TG |
299 | default: |
300 | assert_not_reached("Invalid state."); | |
301 | } | |
302 | ||
ff0c5ebd | 303 | return 0; |
e3dca008 | 304 | |
ff0c5ebd | 305 | fail: |
b24ef049 | 306 | sd_ipv4acd_stop(acd); |
ff0c5ebd | 307 | return 0; |
e3dca008 TG |
308 | } |
309 | ||
b24ef049 | 310 | static void ipv4acd_on_conflict(sd_ipv4acd *acd) { |
e3dca008 | 311 | _cleanup_free_ char *address = NULL; |
b24ef049 | 312 | union in_addr_union addr = { .in.s_addr = acd->address }; |
e3dca008 | 313 | |
b24ef049 | 314 | assert(acd); |
e3dca008 | 315 | |
b24ef049 | 316 | acd->n_conflict++; |
e3dca008 | 317 | |
d246e77a | 318 | (void) in_addr_to_string(AF_INET, &addr, &address); |
b24ef049 | 319 | log_ipv4acd(acd, "Conflict on %s (%u)", strna(address), acd->n_conflict); |
e3dca008 | 320 | |
b24ef049 LP |
321 | ipv4acd_reset(acd); |
322 | ipv4acd_client_notify(acd, SD_IPV4ACD_EVENT_CONFLICT); | |
e3dca008 TG |
323 | } |
324 | ||
e095f51d LP |
325 | static int ipv4acd_on_packet( |
326 | sd_event_source *s, | |
327 | int fd, | |
328 | uint32_t revents, | |
329 | void *userdata) { | |
330 | ||
b24ef049 | 331 | sd_ipv4acd *acd = userdata; |
e3dca008 | 332 | struct ether_arp packet; |
e095f51d | 333 | ssize_t n; |
e3dca008 TG |
334 | int r; |
335 | ||
e095f51d | 336 | assert(s); |
b24ef049 | 337 | assert(acd); |
e3dca008 TG |
338 | assert(fd >= 0); |
339 | ||
e095f51d LP |
340 | n = recv(fd, &packet, sizeof(struct ether_arp), 0); |
341 | if (n < 0) { | |
3742095b | 342 | if (IN_SET(errno, EAGAIN, EINTR)) |
004845d1 LP |
343 | return 0; |
344 | ||
b24ef049 | 345 | log_ipv4acd_errno(acd, errno, "Failed to read ARP packet: %m"); |
ff0c5ebd | 346 | goto fail; |
e095f51d LP |
347 | } |
348 | if ((size_t) n != sizeof(struct ether_arp)) { | |
b24ef049 | 349 | log_ipv4acd(acd, "Ignoring too short ARP packet."); |
e095f51d LP |
350 | return 0; |
351 | } | |
e3dca008 | 352 | |
b24ef049 | 353 | switch (acd->state) { |
e095f51d | 354 | |
e3dca008 TG |
355 | case IPV4ACD_STATE_ANNOUNCING: |
356 | case IPV4ACD_STATE_RUNNING: | |
e095f51d | 357 | |
b24ef049 | 358 | if (ipv4acd_arp_conflict(acd, &packet)) { |
e3dca008 TG |
359 | usec_t ts; |
360 | ||
b24ef049 | 361 | assert_se(sd_event_now(acd->event, clock_boottime_or_monotonic(), &ts) >= 0); |
e3dca008 TG |
362 | |
363 | /* Defend address */ | |
b24ef049 LP |
364 | if (ts > acd->defend_window) { |
365 | acd->defend_window = ts + DEFEND_INTERVAL_USEC; | |
366 | r = arp_send_announcement(acd->fd, acd->ifindex, acd->address, &acd->mac_addr); | |
e3dca008 | 367 | if (r < 0) { |
b24ef049 | 368 | log_ipv4acd_errno(acd, r, "Failed to send ARP announcement: %m"); |
ff0c5ebd | 369 | goto fail; |
e3dca008 | 370 | } else |
b24ef049 | 371 | log_ipv4acd(acd, "DEFEND"); |
e3dca008 TG |
372 | |
373 | } else | |
b24ef049 | 374 | ipv4acd_on_conflict(acd); |
e3dca008 | 375 | } |
e3dca008 | 376 | break; |
e095f51d | 377 | |
e3dca008 TG |
378 | case IPV4ACD_STATE_WAITING_PROBE: |
379 | case IPV4ACD_STATE_PROBING: | |
380 | case IPV4ACD_STATE_WAITING_ANNOUNCE: | |
381 | /* BPF ensures this packet indicates a conflict */ | |
b24ef049 | 382 | ipv4acd_on_conflict(acd); |
e3dca008 | 383 | break; |
e095f51d | 384 | |
e3dca008 TG |
385 | default: |
386 | assert_not_reached("Invalid state."); | |
387 | } | |
388 | ||
ff0c5ebd | 389 | return 0; |
e3dca008 | 390 | |
ff0c5ebd | 391 | fail: |
b24ef049 | 392 | sd_ipv4acd_stop(acd); |
ff0c5ebd | 393 | return 0; |
e3dca008 TG |
394 | } |
395 | ||
b24ef049 LP |
396 | int sd_ipv4acd_set_ifindex(sd_ipv4acd *acd, int ifindex) { |
397 | assert_return(acd, -EINVAL); | |
2f8e7633 | 398 | assert_return(ifindex > 0, -EINVAL); |
b24ef049 | 399 | assert_return(acd->state == IPV4ACD_STATE_INIT, -EBUSY); |
e3dca008 | 400 | |
b24ef049 | 401 | acd->ifindex = ifindex; |
e3dca008 TG |
402 | |
403 | return 0; | |
404 | } | |
405 | ||
b24ef049 LP |
406 | int sd_ipv4acd_set_mac(sd_ipv4acd *acd, const struct ether_addr *addr) { |
407 | assert_return(acd, -EINVAL); | |
e3dca008 | 408 | assert_return(addr, -EINVAL); |
b24ef049 | 409 | assert_return(acd->state == IPV4ACD_STATE_INIT, -EBUSY); |
e3dca008 | 410 | |
b24ef049 | 411 | acd->mac_addr = *addr; |
e3dca008 TG |
412 | |
413 | return 0; | |
414 | } | |
415 | ||
b24ef049 LP |
416 | int sd_ipv4acd_detach_event(sd_ipv4acd *acd) { |
417 | assert_return(acd, -EINVAL); | |
e3dca008 | 418 | |
b24ef049 | 419 | acd->event = sd_event_unref(acd->event); |
e3dca008 TG |
420 | |
421 | return 0; | |
422 | } | |
423 | ||
b24ef049 | 424 | int sd_ipv4acd_attach_event(sd_ipv4acd *acd, sd_event *event, int64_t priority) { |
e3dca008 TG |
425 | int r; |
426 | ||
b24ef049 LP |
427 | assert_return(acd, -EINVAL); |
428 | assert_return(!acd->event, -EBUSY); | |
e3dca008 TG |
429 | |
430 | if (event) | |
b24ef049 | 431 | acd->event = sd_event_ref(event); |
e3dca008 | 432 | else { |
b24ef049 | 433 | r = sd_event_default(&acd->event); |
e3dca008 TG |
434 | if (r < 0) |
435 | return r; | |
436 | } | |
437 | ||
b24ef049 | 438 | acd->event_priority = priority; |
e3dca008 TG |
439 | |
440 | return 0; | |
441 | } | |
442 | ||
b24ef049 LP |
443 | int sd_ipv4acd_set_callback(sd_ipv4acd *acd, sd_ipv4acd_callback_t cb, void *userdata) { |
444 | assert_return(acd, -EINVAL); | |
e3dca008 | 445 | |
b24ef049 LP |
446 | acd->callback = cb; |
447 | acd->userdata = userdata; | |
e3dca008 TG |
448 | |
449 | return 0; | |
450 | } | |
451 | ||
b24ef049 LP |
452 | int sd_ipv4acd_set_address(sd_ipv4acd *acd, const struct in_addr *address) { |
453 | assert_return(acd, -EINVAL); | |
e3dca008 | 454 | assert_return(address, -EINVAL); |
b24ef049 | 455 | assert_return(acd->state == IPV4ACD_STATE_INIT, -EBUSY); |
e3dca008 | 456 | |
b24ef049 | 457 | acd->address = address->s_addr; |
e3dca008 TG |
458 | |
459 | return 0; | |
460 | } | |
461 | ||
b24ef049 LP |
462 | int sd_ipv4acd_is_running(sd_ipv4acd *acd) { |
463 | assert_return(acd, false); | |
e3dca008 | 464 | |
b24ef049 | 465 | return acd->state != IPV4ACD_STATE_INIT; |
e3dca008 TG |
466 | } |
467 | ||
b24ef049 | 468 | int sd_ipv4acd_start(sd_ipv4acd *acd) { |
e3dca008 TG |
469 | int r; |
470 | ||
b24ef049 LP |
471 | assert_return(acd, -EINVAL); |
472 | assert_return(acd->event, -EINVAL); | |
473 | assert_return(acd->ifindex > 0, -EINVAL); | |
474 | assert_return(acd->address != 0, -EINVAL); | |
475 | assert_return(!ether_addr_is_null(&acd->mac_addr), -EINVAL); | |
476 | assert_return(acd->state == IPV4ACD_STATE_INIT, -EBUSY); | |
e3dca008 | 477 | |
b24ef049 | 478 | r = arp_network_bind_raw_socket(acd->ifindex, acd->address, &acd->mac_addr); |
e3dca008 | 479 | if (r < 0) |
d246e77a | 480 | return r; |
e3dca008 | 481 | |
b24ef049 LP |
482 | safe_close(acd->fd); |
483 | acd->fd = r; | |
484 | acd->defend_window = 0; | |
485 | acd->n_conflict = 0; | |
e3dca008 | 486 | |
b24ef049 | 487 | r = sd_event_add_io(acd->event, &acd->receive_message_event_source, acd->fd, EPOLLIN, ipv4acd_on_packet, acd); |
e3dca008 | 488 | if (r < 0) |
d246e77a | 489 | goto fail; |
e3dca008 | 490 | |
b24ef049 | 491 | r = sd_event_source_set_priority(acd->receive_message_event_source, acd->event_priority); |
e3dca008 | 492 | if (r < 0) |
d246e77a | 493 | goto fail; |
e3dca008 | 494 | |
b24ef049 | 495 | (void) sd_event_source_set_description(acd->receive_message_event_source, "ipv4acd-receive-message"); |
e3dca008 | 496 | |
b24ef049 | 497 | r = ipv4acd_set_next_wakeup(acd, 0, 0); |
e3dca008 | 498 | if (r < 0) |
d246e77a | 499 | goto fail; |
e3dca008 | 500 | |
b24ef049 | 501 | ipv4acd_set_state(acd, IPV4ACD_STATE_STARTED, true); |
e3dca008 | 502 | return 0; |
d246e77a LP |
503 | |
504 | fail: | |
b24ef049 | 505 | ipv4acd_reset(acd); |
d246e77a | 506 | return r; |
e3dca008 | 507 | } |