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1 | /* SPDX-License-Identifier: LGPL-2.1+ */ | |
2 | ||
3 | #include <netinet/in.h> | |
4 | #include <linux/if.h> | |
5 | ||
6 | #include "alloc-util.h" | |
7 | #include "hostname-util.h" | |
8 | #include "parse-util.h" | |
9 | #include "network-internal.h" | |
10 | #include "networkd-link.h" | |
11 | #include "networkd-manager.h" | |
12 | #include "networkd-network.h" | |
13 | #include "string-util.h" | |
14 | #include "sysctl-util.h" | |
15 | ||
16 | static int dhcp_remove_routes(Link *link, sd_dhcp_lease *lease, sd_dhcp_lease *new_lease, struct in_addr *address); | |
17 | static int dhcp_remove_router(Link *link, sd_dhcp_lease *lease, struct in_addr *address); | |
18 | static int dhcp_remove_address(Link *link, sd_dhcp_lease *lease, struct in_addr *address); | |
19 | ||
20 | void dhcp4_release_old_lease(Link *link) { | |
21 | union in_addr_union address = IN_ADDR_NULL, address_old = IN_ADDR_NULL; | |
22 | ||
23 | assert(link); | |
24 | ||
25 | if (!link->dhcp_lease_old) | |
26 | return; | |
27 | ||
28 | assert(link->dhcp_lease); | |
29 | ||
30 | (void) sd_dhcp_lease_get_address(link->dhcp_lease_old, &address_old.in); | |
31 | (void) sd_dhcp_lease_get_address(link->dhcp_lease, &address.in); | |
32 | ||
33 | (void) dhcp_remove_routes(link, link->dhcp_lease_old, link->dhcp_lease, &address_old.in); | |
34 | ||
35 | if (!in_addr_equal(AF_INET, &address_old, &address)) { | |
36 | (void) dhcp_remove_router(link, link->dhcp_lease_old, &address_old.in); | |
37 | (void) dhcp_remove_address(link, link->dhcp_lease_old, &address_old.in); | |
38 | } | |
39 | ||
40 | link->dhcp_lease_old = sd_dhcp_lease_unref(link->dhcp_lease_old); | |
41 | link_dirty(link); | |
42 | } | |
43 | ||
44 | static int dhcp4_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { | |
45 | int r; | |
46 | ||
47 | assert(link); | |
48 | assert(link->dhcp4_messages > 0); | |
49 | ||
50 | link->dhcp4_messages--; | |
51 | ||
52 | if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) | |
53 | return 1; | |
54 | ||
55 | r = sd_netlink_message_get_errno(m); | |
56 | if (r < 0 && r != -EEXIST) { | |
57 | log_link_error_errno(link, r, "Could not set DHCPv4 route: %m"); | |
58 | link_enter_failed(link); | |
59 | return 1; | |
60 | } | |
61 | ||
62 | if (link->dhcp4_messages == 0) { | |
63 | link->dhcp4_configured = true; | |
64 | /* New address and routes are configured now. Let's release old lease. */ | |
65 | dhcp4_release_old_lease(link); | |
66 | link_check_ready(link); | |
67 | } | |
68 | ||
69 | return 1; | |
70 | } | |
71 | ||
72 | static int route_scope_from_address(const Route *route, const struct in_addr *self_addr) { | |
73 | assert(route); | |
74 | assert(self_addr); | |
75 | ||
76 | if (in_addr_is_localhost(AF_INET, &route->dst) || | |
77 | (self_addr->s_addr && route->dst.in.s_addr == self_addr->s_addr)) | |
78 | return RT_SCOPE_HOST; | |
79 | else if (in4_addr_is_null(&route->gw.in)) | |
80 | return RT_SCOPE_LINK; | |
81 | else | |
82 | return RT_SCOPE_UNIVERSE; | |
83 | } | |
84 | ||
85 | static int link_set_dhcp_routes(Link *link) { | |
86 | _cleanup_free_ sd_dhcp_route **static_routes = NULL; | |
87 | bool classless_route = false, static_route = false; | |
88 | const struct in_addr *router; | |
89 | struct in_addr address; | |
90 | int r, n, i; | |
91 | uint32_t table; | |
92 | ||
93 | assert(link); | |
94 | ||
95 | if (!link->dhcp_lease) /* link went down while we configured the IP addresses? */ | |
96 | return 0; | |
97 | ||
98 | if (!link->network) /* link went down while we configured the IP addresses? */ | |
99 | return 0; | |
100 | ||
101 | if (!link->network->dhcp_use_routes) | |
102 | return 0; | |
103 | ||
104 | table = link_get_dhcp_route_table(link); | |
105 | ||
106 | r = sd_dhcp_lease_get_address(link->dhcp_lease, &address); | |
107 | if (r < 0) | |
108 | return log_link_warning_errno(link, r, "DHCP error: could not get address: %m"); | |
109 | ||
110 | n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes); | |
111 | if (n == -ENODATA) | |
112 | log_link_debug_errno(link, n, "DHCP: No routes received from DHCP server: %m"); | |
113 | else if (n < 0) | |
114 | log_link_debug_errno(link, n, "DHCP error: could not get routes: %m"); | |
115 | ||
116 | for (i = 0; i < n; i++) { | |
117 | switch (sd_dhcp_route_get_option(static_routes[i])) { | |
118 | case SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE: | |
119 | classless_route = true; | |
120 | break; | |
121 | case SD_DHCP_OPTION_STATIC_ROUTE: | |
122 | static_route = true; | |
123 | break; | |
124 | } | |
125 | } | |
126 | ||
127 | for (i = 0; i < n; i++) { | |
128 | _cleanup_(route_freep) Route *route = NULL; | |
129 | ||
130 | /* if the DHCP server returns both a Classless Static Routes option and a Static Routes option, | |
131 | the DHCP client MUST ignore the Static Routes option. */ | |
132 | if (classless_route && | |
133 | sd_dhcp_route_get_option(static_routes[i]) != SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE) | |
134 | continue; | |
135 | ||
136 | r = route_new(&route); | |
137 | if (r < 0) | |
138 | return log_link_error_errno(link, r, "Could not allocate route: %m"); | |
139 | ||
140 | route->family = AF_INET; | |
141 | route->protocol = RTPROT_DHCP; | |
142 | assert_se(sd_dhcp_route_get_gateway(static_routes[i], &route->gw.in) >= 0); | |
143 | assert_se(sd_dhcp_route_get_destination(static_routes[i], &route->dst.in) >= 0); | |
144 | assert_se(sd_dhcp_route_get_destination_prefix_length(static_routes[i], &route->dst_prefixlen) >= 0); | |
145 | route->priority = link->network->dhcp_route_metric; | |
146 | route->table = table; | |
147 | route->scope = route_scope_from_address(route, &address); | |
148 | ||
149 | r = route_configure(route, link, dhcp4_route_handler); | |
150 | if (r < 0) | |
151 | return log_link_error_errno(link, r, "Could not set host route: %m"); | |
152 | ||
153 | link->dhcp4_messages++; | |
154 | } | |
155 | ||
156 | r = sd_dhcp_lease_get_router(link->dhcp_lease, &router); | |
157 | if (IN_SET(r, 0, -ENODATA)) | |
158 | log_link_info(link, "DHCP: No gateway received from DHCP server."); | |
159 | else if (r < 0) | |
160 | log_link_warning_errno(link, r, "DHCP error: could not get gateway: %m"); | |
161 | else if (in4_addr_is_null(&router[0])) | |
162 | log_link_info(link, "DHCP: Received gateway is null."); | |
163 | ||
164 | /* According to RFC 3442: If the DHCP server returns both a Classless Static Routes option and | |
165 | a Router option, the DHCP client MUST ignore the Router option. */ | |
166 | if (classless_route && static_route) | |
167 | log_link_warning(link, "Classless static routes received from DHCP server: ignoring static-route option and router option"); | |
168 | ||
169 | if (r > 0 && !classless_route && !in4_addr_is_null(&router[0])) { | |
170 | _cleanup_(route_freep) Route *route = NULL, *route_gw = NULL; | |
171 | ||
172 | r = route_new(&route_gw); | |
173 | if (r < 0) | |
174 | return log_link_error_errno(link, r, "Could not allocate route: %m"); | |
175 | ||
176 | /* The dhcp netmask may mask out the gateway. Add an explicit | |
177 | * route for the gw host so that we can route no matter the | |
178 | * netmask or existing kernel route tables. */ | |
179 | route_gw->family = AF_INET; | |
180 | route_gw->dst.in = router[0]; | |
181 | route_gw->dst_prefixlen = 32; | |
182 | route_gw->prefsrc.in = address; | |
183 | route_gw->scope = RT_SCOPE_LINK; | |
184 | route_gw->protocol = RTPROT_DHCP; | |
185 | route_gw->priority = link->network->dhcp_route_metric; | |
186 | route_gw->table = table; | |
187 | ||
188 | r = route_configure(route_gw, link, dhcp4_route_handler); | |
189 | if (r < 0) | |
190 | return log_link_error_errno(link, r, "Could not set host route: %m"); | |
191 | ||
192 | link->dhcp4_messages++; | |
193 | ||
194 | r = route_new(&route); | |
195 | if (r < 0) | |
196 | return log_link_error_errno(link, r, "Could not allocate route: %m"); | |
197 | ||
198 | route->family = AF_INET; | |
199 | route->gw.in = router[0]; | |
200 | route->prefsrc.in = address; | |
201 | route->protocol = RTPROT_DHCP; | |
202 | route->priority = link->network->dhcp_route_metric; | |
203 | route->table = table; | |
204 | ||
205 | r = route_configure(route, link, dhcp4_route_handler); | |
206 | if (r < 0) | |
207 | return log_link_error_errno(link, r, "Could not set routes: %m"); | |
208 | ||
209 | link->dhcp4_messages++; | |
210 | } | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
215 | static bool route_present_in_routes(const Route *route, sd_dhcp_route **routes, unsigned n_routes) { | |
216 | assert(n_routes == 0 || routes); | |
217 | ||
218 | for (unsigned j = 0; j < n_routes; j++) { | |
219 | union in_addr_union a; | |
220 | unsigned char l; | |
221 | ||
222 | assert_se(sd_dhcp_route_get_gateway(routes[j], &a.in) >= 0); | |
223 | if (!in_addr_equal(AF_INET, &a, &route->gw)) | |
224 | continue; | |
225 | assert_se(sd_dhcp_route_get_destination(routes[j], &a.in) >= 0); | |
226 | if (!in_addr_equal(AF_INET, &a, &route->dst)) | |
227 | continue; | |
228 | assert_se(sd_dhcp_route_get_destination_prefix_length(routes[j], &l) >= 0); | |
229 | if (l != route->dst_prefixlen) | |
230 | continue; | |
231 | return true; | |
232 | } | |
233 | ||
234 | return false; | |
235 | } | |
236 | ||
237 | static int dhcp_remove_routes(Link *link, sd_dhcp_lease *lease, sd_dhcp_lease *new_lease, struct in_addr *address) { | |
238 | _cleanup_free_ sd_dhcp_route **routes = NULL, **new_routes = NULL; | |
239 | uint32_t table; | |
240 | int m = 0, n, i, r; | |
241 | ||
242 | assert(link); | |
243 | assert(address); | |
244 | ||
245 | if (!link->network->dhcp_use_routes) | |
246 | return 0; | |
247 | ||
248 | n = sd_dhcp_lease_get_routes(lease, &routes); | |
249 | if (IN_SET(n, 0, -ENODATA)) | |
250 | return 0; | |
251 | else if (n < 0) | |
252 | return log_link_error_errno(link, n, "DHCP error: Failed to get routes: %m"); | |
253 | ||
254 | if (new_lease) { | |
255 | m = sd_dhcp_lease_get_routes(new_lease, &new_routes); | |
256 | if (m == -ENODATA) | |
257 | m = 0; | |
258 | else if (m < 0) | |
259 | return log_link_error_errno(link, m, "DHCP error: Failed to get routes: %m"); | |
260 | } | |
261 | ||
262 | table = link_get_dhcp_route_table(link); | |
263 | ||
264 | for (i = 0; i < n; i++) { | |
265 | _cleanup_(route_freep) Route *route = NULL; | |
266 | ||
267 | r = route_new(&route); | |
268 | if (r < 0) | |
269 | return log_oom(); | |
270 | ||
271 | route->family = AF_INET; | |
272 | assert_se(sd_dhcp_route_get_gateway(routes[i], &route->gw.in) >= 0); | |
273 | assert_se(sd_dhcp_route_get_destination(routes[i], &route->dst.in) >= 0); | |
274 | assert_se(sd_dhcp_route_get_destination_prefix_length(routes[i], &route->dst_prefixlen) >= 0); | |
275 | route->priority = link->network->dhcp_route_metric; | |
276 | route->table = table; | |
277 | route->scope = route_scope_from_address(route, address); | |
278 | ||
279 | if (route_present_in_routes(route, new_routes, m)) | |
280 | continue; | |
281 | ||
282 | (void) route_remove(route, link, NULL); | |
283 | } | |
284 | ||
285 | return n; | |
286 | } | |
287 | ||
288 | static int dhcp_remove_router(Link *link, sd_dhcp_lease *lease, struct in_addr *address) { | |
289 | _cleanup_(route_freep) Route *route_gw = NULL, *route = NULL; | |
290 | const struct in_addr *router; | |
291 | uint32_t table; | |
292 | int r; | |
293 | ||
294 | assert(link); | |
295 | assert(address); | |
296 | ||
297 | if (!link->network->dhcp_use_routes) | |
298 | return 0; | |
299 | ||
300 | r = sd_dhcp_lease_get_router(lease, &router); | |
301 | if (IN_SET(r, 0, -ENODATA)) { | |
302 | log_link_debug(link, "DHCP: No gateway received from DHCP server."); | |
303 | return 0; | |
304 | } else if (r < 0) | |
305 | return log_link_error_errno(link, r, "DHCP error: could not get gateway: %m"); | |
306 | else if (in4_addr_is_null(&router[0])) { | |
307 | log_link_info(link, "DHCP: Received gateway is null, ignoring."); | |
308 | return 0; | |
309 | } | |
310 | ||
311 | table = link_get_dhcp_route_table(link); | |
312 | ||
313 | r = route_new(&route_gw); | |
314 | if (r < 0) | |
315 | return log_oom(); | |
316 | ||
317 | route_gw->family = AF_INET; | |
318 | route_gw->dst.in = router[0]; | |
319 | route_gw->dst_prefixlen = 32; | |
320 | route_gw->prefsrc.in = *address; | |
321 | route_gw->scope = RT_SCOPE_LINK; | |
322 | route_gw->protocol = RTPROT_DHCP; | |
323 | route_gw->priority = link->network->dhcp_route_metric; | |
324 | route_gw->table = table; | |
325 | ||
326 | (void) route_remove(route_gw, link, NULL); | |
327 | ||
328 | r = route_new(&route); | |
329 | if (r < 0) | |
330 | return log_oom(); | |
331 | ||
332 | route->family = AF_INET; | |
333 | route->gw.in = router[0]; | |
334 | route->prefsrc.in = *address; | |
335 | route->protocol = RTPROT_DHCP; | |
336 | route->priority = link->network->dhcp_route_metric; | |
337 | route->table = table; | |
338 | ||
339 | (void) route_remove(route, link, NULL); | |
340 | ||
341 | return 0; | |
342 | } | |
343 | ||
344 | static int dhcp_remove_address(Link *link, sd_dhcp_lease *lease, struct in_addr *address) { | |
345 | _cleanup_(address_freep) Address *a = NULL; | |
346 | struct in_addr netmask; | |
347 | int r; | |
348 | ||
349 | assert(link); | |
350 | assert(address); | |
351 | ||
352 | if (in4_addr_is_null(address)) | |
353 | return 0; | |
354 | ||
355 | r = address_new(&a); | |
356 | if (r < 0) | |
357 | return log_oom(); | |
358 | ||
359 | a->family = AF_INET; | |
360 | a->in_addr.in = *address; | |
361 | ||
362 | if (sd_dhcp_lease_get_netmask(lease, &netmask) >= 0) | |
363 | a->prefixlen = in4_addr_netmask_to_prefixlen(&netmask); | |
364 | ||
365 | (void) address_remove(a, link, NULL); | |
366 | ||
367 | return 0; | |
368 | } | |
369 | ||
370 | static int dhcp_reset_mtu(Link *link) { | |
371 | uint16_t mtu; | |
372 | int r; | |
373 | ||
374 | assert(link); | |
375 | ||
376 | if (!link->network->dhcp_use_mtu) | |
377 | return 0; | |
378 | ||
379 | r = sd_dhcp_lease_get_mtu(link->dhcp_lease, &mtu); | |
380 | if (r < 0) | |
381 | return r; | |
382 | ||
383 | if (link->original_mtu == mtu) | |
384 | return 0; | |
385 | ||
386 | r = link_set_mtu(link, link->original_mtu); | |
387 | if (r < 0) { | |
388 | log_link_error_errno(link, r, "DHCP error: could not reset MTU: %m"); | |
389 | link_enter_failed(link); | |
390 | return r; | |
391 | } | |
392 | ||
393 | return 0; | |
394 | } | |
395 | ||
396 | static int dhcp_reset_hostname(Link *link) { | |
397 | const char *hostname; | |
398 | int r; | |
399 | ||
400 | assert(link); | |
401 | ||
402 | if (!link->network->dhcp_use_hostname) | |
403 | return 0; | |
404 | ||
405 | hostname = link->network->dhcp_hostname; | |
406 | if (!hostname) | |
407 | (void) sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname); | |
408 | ||
409 | if (!hostname) | |
410 | return 0; | |
411 | ||
412 | /* If a hostname was set due to the lease, then unset it now. */ | |
413 | r = manager_set_hostname(link->manager, NULL); | |
414 | if (r < 0) | |
415 | return log_link_error_errno(link, r, "DHCP error: Failed to reset transient hostname: %m"); | |
416 | ||
417 | return 0; | |
418 | } | |
419 | ||
420 | static int dhcp_lease_lost(Link *link) { | |
421 | struct in_addr address = {}; | |
422 | ||
423 | assert(link); | |
424 | assert(link->dhcp_lease); | |
425 | ||
426 | log_link_warning(link, "DHCP lease lost"); | |
427 | ||
428 | link->dhcp4_configured = false; | |
429 | ||
430 | (void) sd_dhcp_lease_get_address(link->dhcp_lease, &address); | |
431 | (void) dhcp_remove_routes(link, link->dhcp_lease, NULL, &address); | |
432 | (void) dhcp_remove_router(link, link->dhcp_lease, &address); | |
433 | (void) dhcp_remove_address(link, link->dhcp_lease, &address); | |
434 | (void) dhcp_reset_mtu(link); | |
435 | (void) dhcp_reset_hostname(link); | |
436 | ||
437 | link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease); | |
438 | link_dirty(link); | |
439 | ||
440 | return 0; | |
441 | } | |
442 | ||
443 | static int dhcp4_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { | |
444 | int r; | |
445 | ||
446 | assert(link); | |
447 | ||
448 | if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) | |
449 | return 1; | |
450 | ||
451 | r = sd_netlink_message_get_errno(m); | |
452 | if (r < 0 && r != -EEXIST) { | |
453 | log_link_error_errno(link, r, "Could not set DHCPv4 address: %m"); | |
454 | link_enter_failed(link); | |
455 | return 1; | |
456 | } | |
457 | ||
458 | manager_rtnl_process_address(rtnl, m, link->manager); | |
459 | ||
460 | r = link_set_dhcp_routes(link); | |
461 | if (r < 0) { | |
462 | link_enter_failed(link); | |
463 | return 1; | |
464 | } | |
465 | ||
466 | /* Add back static routes since kernel removes while DHCPv4 address is removed from when lease expires */ | |
467 | link_request_set_routes(link); | |
468 | ||
469 | if (link->dhcp4_messages == 0) { | |
470 | link->dhcp4_configured = true; | |
471 | /* The new address is configured, and no route is requested. | |
472 | * Let's drop the old lease. */ | |
473 | dhcp4_release_old_lease(link); | |
474 | link_check_ready(link); | |
475 | } | |
476 | ||
477 | return 1; | |
478 | } | |
479 | ||
480 | static int dhcp4_update_address(Link *link, | |
481 | struct in_addr *address, | |
482 | struct in_addr *netmask, | |
483 | uint32_t lifetime) { | |
484 | _cleanup_(address_freep) Address *addr = NULL; | |
485 | unsigned prefixlen; | |
486 | int r; | |
487 | ||
488 | assert(address); | |
489 | assert(netmask); | |
490 | assert(lifetime); | |
491 | ||
492 | prefixlen = in4_addr_netmask_to_prefixlen(netmask); | |
493 | ||
494 | r = address_new(&addr); | |
495 | if (r < 0) | |
496 | return r; | |
497 | ||
498 | addr->family = AF_INET; | |
499 | addr->in_addr.in.s_addr = address->s_addr; | |
500 | addr->cinfo.ifa_prefered = lifetime; | |
501 | addr->cinfo.ifa_valid = lifetime; | |
502 | addr->prefixlen = prefixlen; | |
503 | addr->broadcast.s_addr = address->s_addr | ~netmask->s_addr; | |
504 | ||
505 | /* allow reusing an existing address and simply update its lifetime | |
506 | * in case it already exists */ | |
507 | r = address_configure(addr, link, dhcp4_address_handler, true); | |
508 | if (r < 0) | |
509 | return r; | |
510 | ||
511 | return 0; | |
512 | } | |
513 | ||
514 | static int dhcp_lease_renew(sd_dhcp_client *client, Link *link) { | |
515 | sd_dhcp_lease *lease; | |
516 | struct in_addr address; | |
517 | struct in_addr netmask; | |
518 | uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME; | |
519 | int r; | |
520 | ||
521 | assert(link); | |
522 | assert(client); | |
523 | assert(link->network); | |
524 | ||
525 | r = sd_dhcp_client_get_lease(client, &lease); | |
526 | if (r < 0) | |
527 | return log_link_warning_errno(link, r, "DHCP error: no lease: %m"); | |
528 | ||
529 | sd_dhcp_lease_unref(link->dhcp_lease); | |
530 | link->dhcp4_configured = false; | |
531 | link->dhcp_lease = sd_dhcp_lease_ref(lease); | |
532 | link_dirty(link); | |
533 | ||
534 | r = sd_dhcp_lease_get_address(lease, &address); | |
535 | if (r < 0) | |
536 | return log_link_warning_errno(link, r, "DHCP error: no address: %m"); | |
537 | ||
538 | r = sd_dhcp_lease_get_netmask(lease, &netmask); | |
539 | if (r < 0) | |
540 | return log_link_warning_errno(link, r, "DHCP error: no netmask: %m"); | |
541 | ||
542 | if (!FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) { | |
543 | r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, &lifetime); | |
544 | if (r < 0) | |
545 | return log_link_warning_errno(link, r, "DHCP error: no lifetime: %m"); | |
546 | } | |
547 | ||
548 | r = dhcp4_update_address(link, &address, &netmask, lifetime); | |
549 | if (r < 0) | |
550 | return log_link_warning_errno(link, r, "Could not update IP address: %m"); | |
551 | ||
552 | return 0; | |
553 | } | |
554 | ||
555 | static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) { | |
556 | const struct in_addr *router; | |
557 | sd_dhcp_lease *lease; | |
558 | struct in_addr address; | |
559 | struct in_addr netmask; | |
560 | unsigned prefixlen; | |
561 | uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME; | |
562 | int r; | |
563 | ||
564 | assert(client); | |
565 | assert(link); | |
566 | ||
567 | link->dhcp4_configured = false; | |
568 | ||
569 | r = sd_dhcp_client_get_lease(client, &lease); | |
570 | if (r < 0) | |
571 | return log_link_error_errno(link, r, "DHCP error: No lease: %m"); | |
572 | ||
573 | r = sd_dhcp_lease_get_address(lease, &address); | |
574 | if (r < 0) | |
575 | return log_link_error_errno(link, r, "DHCP error: No address: %m"); | |
576 | ||
577 | r = sd_dhcp_lease_get_netmask(lease, &netmask); | |
578 | if (r < 0) | |
579 | return log_link_error_errno(link, r, "DHCP error: No netmask: %m"); | |
580 | ||
581 | prefixlen = in4_addr_netmask_to_prefixlen(&netmask); | |
582 | ||
583 | if (!FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) { | |
584 | r = sd_dhcp_lease_get_lifetime(lease, &lifetime); | |
585 | if (r < 0) | |
586 | return log_link_warning_errno(link, r, "DHCP error: no lifetime: %m"); | |
587 | } | |
588 | ||
589 | r = sd_dhcp_lease_get_router(lease, &router); | |
590 | if (r < 0 && r != -ENODATA) | |
591 | return log_link_error_errno(link, r, "DHCP error: Could not get gateway: %m"); | |
592 | ||
593 | if (r > 0 && !in4_addr_is_null(&router[0])) | |
594 | log_struct(LOG_INFO, | |
595 | LOG_LINK_INTERFACE(link), | |
596 | LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u", | |
597 | ADDRESS_FMT_VAL(address), | |
598 | prefixlen, | |
599 | ADDRESS_FMT_VAL(router[0])), | |
600 | "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address), | |
601 | "PREFIXLEN=%u", prefixlen, | |
602 | "GATEWAY=%u.%u.%u.%u", ADDRESS_FMT_VAL(router[0])); | |
603 | else | |
604 | log_struct(LOG_INFO, | |
605 | LOG_LINK_INTERFACE(link), | |
606 | LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u", | |
607 | ADDRESS_FMT_VAL(address), | |
608 | prefixlen), | |
609 | "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address), | |
610 | "PREFIXLEN=%u", prefixlen); | |
611 | ||
612 | link->dhcp_lease = sd_dhcp_lease_ref(lease); | |
613 | link_dirty(link); | |
614 | ||
615 | if (link->network->dhcp_use_mtu) { | |
616 | uint16_t mtu; | |
617 | ||
618 | r = sd_dhcp_lease_get_mtu(lease, &mtu); | |
619 | if (r >= 0) { | |
620 | r = link_set_mtu(link, mtu); | |
621 | if (r < 0) | |
622 | log_link_error_errno(link, r, "Failed to set MTU to %" PRIu16 ": %m", mtu); | |
623 | } | |
624 | } | |
625 | ||
626 | if (link->network->dhcp_use_hostname) { | |
627 | const char *dhcpname = NULL; | |
628 | _cleanup_free_ char *hostname = NULL; | |
629 | ||
630 | if (link->network->dhcp_hostname) | |
631 | dhcpname = link->network->dhcp_hostname; | |
632 | else | |
633 | (void) sd_dhcp_lease_get_hostname(lease, &dhcpname); | |
634 | ||
635 | if (dhcpname) { | |
636 | r = shorten_overlong(dhcpname, &hostname); | |
637 | if (r < 0) | |
638 | log_link_warning_errno(link, r, "Unable to shorten overlong DHCP hostname '%s', ignoring: %m", dhcpname); | |
639 | if (r == 1) | |
640 | log_link_notice(link, "Overlong DHCP hostname received, shortened from '%s' to '%s'", dhcpname, hostname); | |
641 | } | |
642 | ||
643 | if (hostname) { | |
644 | r = manager_set_hostname(link->manager, hostname); | |
645 | if (r < 0) | |
646 | log_link_error_errno(link, r, "Failed to set transient hostname to '%s': %m", hostname); | |
647 | } | |
648 | } | |
649 | ||
650 | if (link->network->dhcp_use_timezone) { | |
651 | const char *tz = NULL; | |
652 | ||
653 | (void) sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz); | |
654 | ||
655 | if (tz) { | |
656 | r = manager_set_timezone(link->manager, tz); | |
657 | if (r < 0) | |
658 | log_link_error_errno(link, r, "Failed to set timezone to '%s': %m", tz); | |
659 | } | |
660 | } | |
661 | ||
662 | r = dhcp4_update_address(link, &address, &netmask, lifetime); | |
663 | if (r < 0) | |
664 | return log_link_warning_errno(link, r, "Could not update IP address: %m"); | |
665 | ||
666 | return 0; | |
667 | } | |
668 | ||
669 | static int dhcp_lease_ip_change(sd_dhcp_client *client, Link *link) { | |
670 | int r; | |
671 | ||
672 | link->dhcp_lease_old = TAKE_PTR(link->dhcp_lease); | |
673 | ||
674 | /* On ip address change, to keep the connectability, we would like to assign new address and | |
675 | * routes, and then release old lease. There are two possible success paths: | |
676 | * | |
677 | * 1. new address and routes are configured. | |
678 | * -> handled by dhcp_release_old_lease() in dhcp4_route_handler(). | |
679 | * 2. new address is configured and no route is requested. | |
680 | * -> handled by dhcp_release_old_lease() in dhcp4_address_handler(). | |
681 | * | |
682 | * On error in assigning new address and routes, then the link always enters to the failed | |
683 | * state. And link_enter_failed() leads to the DHCP client to be stopped. So, | |
684 | * dhcp_release_old_lease() will be also called by link_stop_clients(). | |
685 | */ | |
686 | ||
687 | r = dhcp_lease_acquired(client, link); | |
688 | if (r < 0) { | |
689 | /* If it fails, then the new address is not configured yet. | |
690 | * So, let's simply drop the old lease. */ | |
691 | sd_dhcp_lease_unref(link->dhcp_lease); | |
692 | link->dhcp_lease = TAKE_PTR(link->dhcp_lease_old); | |
693 | (void) dhcp_lease_lost(link); | |
694 | return r; | |
695 | } | |
696 | ||
697 | return 0; | |
698 | } | |
699 | ||
700 | static int dhcp_server_is_black_listed(Link *link, sd_dhcp_client *client) { | |
701 | sd_dhcp_lease *lease; | |
702 | struct in_addr addr; | |
703 | int r; | |
704 | ||
705 | assert(link); | |
706 | assert(link->network); | |
707 | assert(client); | |
708 | ||
709 | r = sd_dhcp_client_get_lease(client, &lease); | |
710 | if (r < 0) | |
711 | return log_link_error_errno(link, r, "Failed to get DHCP lease: %m"); | |
712 | ||
713 | r = sd_dhcp_lease_get_server_identifier(lease, &addr); | |
714 | if (r < 0) | |
715 | return log_link_debug_errno(link, r, "Failed to get DHCP server ip address: %m"); | |
716 | ||
717 | if (set_contains(link->network->dhcp_black_listed_ip, UINT32_TO_PTR(addr.s_addr))) { | |
718 | log_struct(LOG_DEBUG, | |
719 | LOG_LINK_INTERFACE(link), | |
720 | LOG_LINK_MESSAGE(link, "DHCPv4 ip '%u.%u.%u.%u' found in black listed ip addresses, ignoring offer", | |
721 | ADDRESS_FMT_VAL(addr))); | |
722 | return true; | |
723 | } | |
724 | ||
725 | return false; | |
726 | } | |
727 | ||
728 | static int dhcp4_handler(sd_dhcp_client *client, int event, void *userdata) { | |
729 | Link *link = userdata; | |
730 | int r; | |
731 | ||
732 | assert(link); | |
733 | assert(link->network); | |
734 | assert(link->manager); | |
735 | ||
736 | if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) | |
737 | return 0; | |
738 | ||
739 | switch (event) { | |
740 | case SD_DHCP_CLIENT_EVENT_STOP: | |
741 | ||
742 | if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4)) { | |
743 | assert(link->ipv4ll); | |
744 | ||
745 | log_link_debug(link, "DHCP client is stopped. Acquiring IPv4 link-local address"); | |
746 | ||
747 | r = sd_ipv4ll_start(link->ipv4ll); | |
748 | if (r < 0) | |
749 | return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m"); | |
750 | } | |
751 | ||
752 | if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) { | |
753 | log_link_notice(link, "DHCPv4 connection considered critical, ignoring request to reconfigure it."); | |
754 | return 0; | |
755 | } | |
756 | ||
757 | if (link->network->dhcp_send_release) | |
758 | (void) sd_dhcp_client_send_release(client); | |
759 | ||
760 | if (link->dhcp_lease) { | |
761 | r = dhcp_lease_lost(link); | |
762 | if (r < 0) { | |
763 | link_enter_failed(link); | |
764 | return r; | |
765 | } | |
766 | } | |
767 | ||
768 | break; | |
769 | case SD_DHCP_CLIENT_EVENT_EXPIRED: | |
770 | if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) { | |
771 | log_link_notice(link, "DHCPv4 connection considered critical, ignoring request to reconfigure it."); | |
772 | return 0; | |
773 | } | |
774 | ||
775 | if (link->dhcp_lease) { | |
776 | r = dhcp_lease_lost(link); | |
777 | if (r < 0) { | |
778 | link_enter_failed(link); | |
779 | return r; | |
780 | } | |
781 | } | |
782 | ||
783 | break; | |
784 | case SD_DHCP_CLIENT_EVENT_IP_CHANGE: | |
785 | if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) { | |
786 | log_link_notice(link, "DHCPv4 connection considered critical, ignoring request to reconfigure it."); | |
787 | return 0; | |
788 | } | |
789 | ||
790 | r = dhcp_lease_ip_change(client, link); | |
791 | if (r < 0) { | |
792 | link_enter_failed(link); | |
793 | return r; | |
794 | } | |
795 | ||
796 | break; | |
797 | case SD_DHCP_CLIENT_EVENT_RENEW: | |
798 | r = dhcp_lease_renew(client, link); | |
799 | if (r < 0) { | |
800 | link_enter_failed(link); | |
801 | return r; | |
802 | } | |
803 | break; | |
804 | case SD_DHCP_CLIENT_EVENT_IP_ACQUIRE: | |
805 | r = dhcp_lease_acquired(client, link); | |
806 | if (r < 0) { | |
807 | link_enter_failed(link); | |
808 | return r; | |
809 | } | |
810 | break; | |
811 | case SD_DHCP_CLIENT_EVENT_SELECTING: | |
812 | r = dhcp_server_is_black_listed(link, client); | |
813 | if (r < 0) | |
814 | return r; | |
815 | if (r != 0) | |
816 | return -ENOMSG; | |
817 | break; | |
818 | default: | |
819 | if (event < 0) | |
820 | log_link_warning_errno(link, event, "DHCP error: Client failed: %m"); | |
821 | else | |
822 | log_link_warning(link, "DHCP unknown event: %i", event); | |
823 | break; | |
824 | } | |
825 | ||
826 | return 0; | |
827 | } | |
828 | ||
829 | static int dhcp4_set_hostname(Link *link) { | |
830 | _cleanup_free_ char *hostname = NULL; | |
831 | const char *hn; | |
832 | int r; | |
833 | ||
834 | assert(link); | |
835 | ||
836 | if (!link->network->dhcp_send_hostname) | |
837 | hn = NULL; | |
838 | else if (link->network->dhcp_hostname) | |
839 | hn = link->network->dhcp_hostname; | |
840 | else { | |
841 | r = gethostname_strict(&hostname); | |
842 | if (r < 0 && r != -ENXIO) /* ENXIO: no hostname set or hostname is "localhost" */ | |
843 | return r; | |
844 | ||
845 | hn = hostname; | |
846 | } | |
847 | ||
848 | r = sd_dhcp_client_set_hostname(link->dhcp_client, hn); | |
849 | if (r == -EINVAL && hostname) | |
850 | /* Ignore error when the machine's hostname is not suitable to send in DHCP packet. */ | |
851 | log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set hostname from kernel hostname, ignoring: %m"); | |
852 | else if (r < 0) | |
853 | return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set hostname: %m"); | |
854 | ||
855 | return 0; | |
856 | } | |
857 | ||
858 | static bool promote_secondaries_enabled(const char *ifname) { | |
859 | _cleanup_free_ char *promote_secondaries_sysctl = NULL; | |
860 | char *promote_secondaries_path; | |
861 | int r; | |
862 | ||
863 | promote_secondaries_path = strjoina("net/ipv4/conf/", ifname, "/promote_secondaries"); | |
864 | r = sysctl_read(promote_secondaries_path, &promote_secondaries_sysctl); | |
865 | if (r < 0) { | |
866 | log_debug_errno(r, "Cannot read sysctl %s", promote_secondaries_path); | |
867 | return false; | |
868 | } | |
869 | ||
870 | truncate_nl(promote_secondaries_sysctl); | |
871 | r = parse_boolean(promote_secondaries_sysctl); | |
872 | if (r < 0) | |
873 | log_warning_errno(r, "Cannot parse sysctl %s with content %s as boolean", promote_secondaries_path, promote_secondaries_sysctl); | |
874 | return r > 0; | |
875 | } | |
876 | ||
877 | /* dhcp4_set_promote_secondaries will ensure this interface has | |
878 | * the "promote_secondaries" option in the kernel set. If this sysctl | |
879 | * is not set DHCP will work only as long as the IP address does not | |
880 | * changes between leases. The kernel will remove all secondary IP | |
881 | * addresses of an interface otherwise. The way systemd-network works | |
882 | * is that the new IP of a lease is added as a secondary IP and when | |
883 | * the primary one expires it relies on the kernel to promote the | |
884 | * secondary IP. See also https://github.com/systemd/systemd/issues/7163 | |
885 | */ | |
886 | int dhcp4_set_promote_secondaries(Link *link) { | |
887 | int r; | |
888 | ||
889 | assert(link); | |
890 | assert(link->network); | |
891 | assert(link->network->dhcp & ADDRESS_FAMILY_IPV4); | |
892 | ||
893 | /* check if the kernel has promote_secondaries enabled for our | |
894 | * interface. If it is not globally enabled or enabled for the | |
895 | * specific interface we must either enable it. | |
896 | */ | |
897 | if (!(promote_secondaries_enabled("all") || promote_secondaries_enabled(link->ifname))) { | |
898 | char *promote_secondaries_path = NULL; | |
899 | ||
900 | log_link_debug(link, "promote_secondaries is unset, setting it"); | |
901 | promote_secondaries_path = strjoina("net/ipv4/conf/", link->ifname, "/promote_secondaries"); | |
902 | r = sysctl_write(promote_secondaries_path, "1"); | |
903 | if (r < 0) | |
904 | log_link_warning_errno(link, r, "cannot set sysctl %s to 1", promote_secondaries_path); | |
905 | return r > 0; | |
906 | } | |
907 | ||
908 | return 0; | |
909 | } | |
910 | ||
911 | int dhcp4_set_client_identifier(Link *link) { | |
912 | int r; | |
913 | ||
914 | assert(link); | |
915 | assert(link->network); | |
916 | assert(link->dhcp_client); | |
917 | ||
918 | switch (link->network->dhcp_client_identifier) { | |
919 | case DHCP_CLIENT_ID_DUID: { | |
920 | /* If configured, apply user specified DUID and IAID */ | |
921 | const DUID *duid = link_get_duid(link); | |
922 | ||
923 | if (duid->type == DUID_TYPE_LLT && duid->raw_data_len == 0) | |
924 | r = sd_dhcp_client_set_iaid_duid_llt(link->dhcp_client, | |
925 | link->network->iaid_set, | |
926 | link->network->iaid, | |
927 | duid->llt_time); | |
928 | else | |
929 | r = sd_dhcp_client_set_iaid_duid(link->dhcp_client, | |
930 | link->network->iaid_set, | |
931 | link->network->iaid, | |
932 | duid->type, | |
933 | duid->raw_data_len > 0 ? duid->raw_data : NULL, | |
934 | duid->raw_data_len); | |
935 | if (r < 0) | |
936 | return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set IAID+DUID: %m"); | |
937 | break; | |
938 | } | |
939 | case DHCP_CLIENT_ID_DUID_ONLY: { | |
940 | /* If configured, apply user specified DUID */ | |
941 | const DUID *duid = link_get_duid(link); | |
942 | ||
943 | if (duid->type == DUID_TYPE_LLT && duid->raw_data_len == 0) | |
944 | r = sd_dhcp_client_set_duid_llt(link->dhcp_client, | |
945 | duid->llt_time); | |
946 | else | |
947 | r = sd_dhcp_client_set_duid(link->dhcp_client, | |
948 | duid->type, | |
949 | duid->raw_data_len > 0 ? duid->raw_data : NULL, | |
950 | duid->raw_data_len); | |
951 | if (r < 0) | |
952 | return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set DUID: %m"); | |
953 | break; | |
954 | } | |
955 | case DHCP_CLIENT_ID_MAC: | |
956 | r = sd_dhcp_client_set_client_id(link->dhcp_client, | |
957 | ARPHRD_ETHER, | |
958 | (const uint8_t *) &link->mac, | |
959 | sizeof(link->mac)); | |
960 | if (r < 0) | |
961 | return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set client ID: %m"); | |
962 | break; | |
963 | default: | |
964 | assert_not_reached("Unknown client identifier type."); | |
965 | } | |
966 | ||
967 | return 0; | |
968 | } | |
969 | ||
970 | int dhcp4_configure(Link *link) { | |
971 | int r; | |
972 | ||
973 | assert(link); | |
974 | assert(link->network); | |
975 | assert(link->network->dhcp & ADDRESS_FAMILY_IPV4); | |
976 | ||
977 | if (!link->dhcp_client) { | |
978 | r = sd_dhcp_client_new(&link->dhcp_client, link->network->dhcp_anonymize); | |
979 | if (r == -ENOMEM) | |
980 | return log_oom(); | |
981 | if (r < 0) | |
982 | return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to create DHCP4 client: %m"); | |
983 | } | |
984 | ||
985 | r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0); | |
986 | if (r < 0) | |
987 | return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to attach event: %m"); | |
988 | ||
989 | r = sd_dhcp_client_set_mac(link->dhcp_client, | |
990 | (const uint8_t *) &link->mac, | |
991 | sizeof (link->mac), ARPHRD_ETHER); | |
992 | if (r < 0) | |
993 | return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set MAC address: %m"); | |
994 | ||
995 | r = sd_dhcp_client_set_ifindex(link->dhcp_client, link->ifindex); | |
996 | if (r < 0) | |
997 | return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set ifindex: %m"); | |
998 | ||
999 | r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp4_handler, link); | |
1000 | if (r < 0) | |
1001 | return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set callback: %m"); | |
1002 | ||
1003 | r = sd_dhcp_client_set_request_broadcast(link->dhcp_client, | |
1004 | link->network->dhcp_broadcast); | |
1005 | if (r < 0) | |
1006 | return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for broadcast: %m"); | |
1007 | ||
1008 | if (link->mtu) { | |
1009 | r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu); | |
1010 | if (r < 0) | |
1011 | return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set MTU: %m"); | |
1012 | } | |
1013 | ||
1014 | if (link->network->dhcp_use_mtu) { | |
1015 | r = sd_dhcp_client_set_request_option(link->dhcp_client, | |
1016 | SD_DHCP_OPTION_INTERFACE_MTU); | |
1017 | if (r < 0) | |
1018 | return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for MTU: %m"); | |
1019 | } | |
1020 | ||
1021 | /* NOTE: even if this variable is called "use", it also "sends" PRL | |
1022 | * options, maybe there should be a different configuration variable | |
1023 | * to send or not route options?. */ | |
1024 | /* NOTE: when using Anonymize=yes, routes PRL options are sent | |
1025 | * by default, so they don't need to be added here. */ | |
1026 | if (link->network->dhcp_use_routes && !link->network->dhcp_anonymize) { | |
1027 | r = sd_dhcp_client_set_request_option(link->dhcp_client, | |
1028 | SD_DHCP_OPTION_STATIC_ROUTE); | |
1029 | if (r < 0) | |
1030 | return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for static route: %m"); | |
1031 | ||
1032 | r = sd_dhcp_client_set_request_option(link->dhcp_client, | |
1033 | SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE); | |
1034 | if (r < 0) | |
1035 | return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for classless static route: %m"); | |
1036 | } | |
1037 | ||
1038 | if (link->network->dhcp_use_ntp) { | |
1039 | r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NTP_SERVER); | |
1040 | if (r < 0) | |
1041 | return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for NTP server: %m"); | |
1042 | } | |
1043 | ||
1044 | if (link->network->dhcp_use_timezone) { | |
1045 | r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NEW_TZDB_TIMEZONE); | |
1046 | if (r < 0) | |
1047 | return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for timezone: %m"); | |
1048 | } | |
1049 | ||
1050 | r = dhcp4_set_hostname(link); | |
1051 | if (r < 0) | |
1052 | return r; | |
1053 | ||
1054 | if (link->network->dhcp_vendor_class_identifier) { | |
1055 | r = sd_dhcp_client_set_vendor_class_identifier(link->dhcp_client, | |
1056 | link->network->dhcp_vendor_class_identifier); | |
1057 | if (r < 0) | |
1058 | return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set vendor class identifier: %m"); | |
1059 | } | |
1060 | ||
1061 | if (link->network->dhcp_user_class) { | |
1062 | r = sd_dhcp_client_set_user_class(link->dhcp_client, (const char **) link->network->dhcp_user_class); | |
1063 | if (r < 0) | |
1064 | return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set user class: %m"); | |
1065 | } | |
1066 | ||
1067 | if (link->network->dhcp_client_port) { | |
1068 | r = sd_dhcp_client_set_client_port(link->dhcp_client, link->network->dhcp_client_port); | |
1069 | if (r < 0) | |
1070 | return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set listen port: %m"); | |
1071 | } | |
1072 | ||
1073 | if (link->network->dhcp_max_attempts > 0) { | |
1074 | r = sd_dhcp_client_set_max_attempts(link->dhcp_client, link->network->dhcp_max_attempts); | |
1075 | if (r < 0) | |
1076 | return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set max attempts: %m"); | |
1077 | } | |
1078 | ||
1079 | return dhcp4_set_client_identifier(link); | |
1080 | } |