Line data Source code
1 : /* SPDX-License-Identifier: LGPL-2.1+ */
2 :
3 : #include <netinet/in.h>
4 : #include <linux/if.h>
5 : #include <linux/if_arp.h>
6 :
7 : #include "alloc-util.h"
8 : #include "hostname-util.h"
9 : #include "parse-util.h"
10 : #include "network-internal.h"
11 : #include "networkd-dhcp4.h"
12 : #include "networkd-link.h"
13 : #include "networkd-manager.h"
14 : #include "networkd-network.h"
15 : #include "string-table.h"
16 : #include "string-util.h"
17 : #include "sysctl-util.h"
18 :
19 : static int dhcp_remove_routes(Link *link, sd_dhcp_lease *lease, const struct in_addr *address, bool remove_all);
20 : static int dhcp_remove_router(Link *link, sd_dhcp_lease *lease, const struct in_addr *address, bool remove_all);
21 : static int dhcp_remove_dns_routes(Link *link, sd_dhcp_lease *lease, const struct in_addr *address, bool remove_all);
22 : static int dhcp_remove_address(Link *link, sd_dhcp_lease *lease, const struct in_addr *address);
23 :
24 6 : void dhcp4_release_old_lease(Link *link) {
25 6 : struct in_addr address = {}, address_old = {};
26 :
27 6 : assert(link);
28 :
29 6 : if (!link->dhcp_lease_old)
30 6 : return;
31 :
32 0 : assert(link->dhcp_lease);
33 :
34 0 : (void) sd_dhcp_lease_get_address(link->dhcp_lease_old, &address_old);
35 0 : (void) sd_dhcp_lease_get_address(link->dhcp_lease, &address);
36 :
37 0 : (void) dhcp_remove_routes(link, link->dhcp_lease_old, &address_old, false);
38 0 : (void) dhcp_remove_router(link, link->dhcp_lease_old, &address_old, false);
39 0 : (void) dhcp_remove_dns_routes(link, link->dhcp_lease_old, &address_old, false);
40 :
41 0 : if (!in4_addr_equal(&address_old, &address))
42 0 : (void) dhcp_remove_address(link, link->dhcp_lease_old, &address_old);
43 :
44 0 : link->dhcp_lease_old = sd_dhcp_lease_unref(link->dhcp_lease_old);
45 0 : link_dirty(link);
46 : }
47 :
48 0 : static int dhcp4_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
49 : int r;
50 :
51 0 : assert(link);
52 0 : assert(link->dhcp4_messages > 0);
53 :
54 0 : link->dhcp4_messages--;
55 :
56 0 : if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
57 0 : return 1;
58 :
59 0 : r = sd_netlink_message_get_errno(m);
60 0 : if (r < 0 && r != -EEXIST) {
61 0 : log_link_error_errno(link, r, "Could not set DHCPv4 route: %m");
62 0 : link_enter_failed(link);
63 0 : return 1;
64 : }
65 :
66 0 : if (link->dhcp4_messages == 0) {
67 0 : link->dhcp4_configured = true;
68 : /* New address and routes are configured now. Let's release old lease. */
69 0 : dhcp4_release_old_lease(link);
70 0 : link_check_ready(link);
71 : }
72 :
73 0 : return 1;
74 : }
75 :
76 0 : static int route_scope_from_address(const Route *route, const struct in_addr *self_addr) {
77 0 : assert(route);
78 0 : assert(self_addr);
79 :
80 0 : if (in4_addr_is_localhost(&route->dst.in) ||
81 0 : (!in4_addr_is_null(self_addr) && in4_addr_equal(&route->dst.in, self_addr)))
82 0 : return RT_SCOPE_HOST;
83 0 : else if (in4_addr_is_null(&route->gw.in))
84 0 : return RT_SCOPE_LINK;
85 : else
86 0 : return RT_SCOPE_UNIVERSE;
87 : }
88 :
89 0 : static int dhcp_route_configure(Route **route, Link *link) {
90 : int r;
91 :
92 0 : assert(route);
93 0 : assert(*route);
94 0 : assert(link);
95 :
96 0 : if (set_contains(link->dhcp_routes, *route))
97 0 : return 0;
98 :
99 0 : r = route_configure(*route, link, dhcp4_route_handler);
100 0 : if (r <= 0)
101 0 : return r;
102 :
103 0 : link->dhcp4_messages++;
104 :
105 0 : r = set_put(link->dhcp_routes, *route);
106 0 : if (r < 0)
107 0 : return r;
108 :
109 0 : TAKE_PTR(*route);
110 0 : return 0;
111 : }
112 :
113 0 : static int link_set_dns_routes(Link *link, const struct in_addr *address) {
114 : const struct in_addr *dns;
115 : uint32_t table;
116 : int i, n, r;
117 :
118 0 : assert(link);
119 0 : assert(link->dhcp_lease);
120 0 : assert(link->network);
121 :
122 0 : if (!link->network->dhcp_use_dns ||
123 0 : !link->network->dhcp_routes_to_dns)
124 0 : return 0;
125 :
126 0 : n = sd_dhcp_lease_get_dns(link->dhcp_lease, &dns);
127 0 : if (IN_SET(n, 0, -ENODATA))
128 0 : return 0;
129 0 : if (n < 0)
130 0 : return log_link_warning_errno(link, n, "DHCP error: could not get DNS servers: %m");
131 :
132 0 : table = link_get_dhcp_route_table(link);
133 :
134 0 : for (i = 0; i < n; i ++) {
135 0 : _cleanup_(route_freep) Route *route = NULL;
136 :
137 0 : r = route_new(&route);
138 0 : if (r < 0)
139 0 : return log_link_error_errno(link, r, "Could not allocate route: %m");
140 :
141 : /* Set routes to DNS servers. */
142 :
143 0 : route->family = AF_INET;
144 0 : route->dst.in = dns[i];
145 0 : route->dst_prefixlen = 32;
146 0 : route->prefsrc.in = *address;
147 0 : route->scope = RT_SCOPE_LINK;
148 0 : route->protocol = RTPROT_DHCP;
149 0 : route->priority = link->network->dhcp_route_metric;
150 0 : route->table = table;
151 :
152 0 : r = dhcp_route_configure(&route, link);
153 0 : if (r < 0)
154 0 : return log_link_error_errno(link, r, "Could not set route to DNS server: %m");
155 : }
156 :
157 0 : return 0;
158 : }
159 :
160 0 : static int link_set_dhcp_routes(Link *link) {
161 0 : _cleanup_free_ sd_dhcp_route **static_routes = NULL;
162 0 : bool classless_route = false, static_route = false;
163 : const struct in_addr *router;
164 : struct in_addr address;
165 : int r, n, i;
166 : uint32_t table;
167 :
168 0 : assert(link);
169 :
170 0 : if (!link->dhcp_lease) /* link went down while we configured the IP addresses? */
171 0 : return 0;
172 :
173 0 : if (!link->network) /* link went down while we configured the IP addresses? */
174 0 : return 0;
175 :
176 0 : if (!link->network->dhcp_use_routes)
177 0 : return 0;
178 :
179 0 : if (!link_has_carrier(link) && !link->network->configure_without_carrier)
180 : /* During configuring addresses, the link lost its carrier. As networkd is dropping
181 : * the addresses now, let's not configure the routes either. */
182 0 : return 0;
183 :
184 0 : r = set_ensure_allocated(&link->dhcp_routes, &route_full_hash_ops);
185 0 : if (r < 0)
186 0 : return log_oom();
187 :
188 : /* Clear old entries in case the set was already allocated */
189 0 : set_clear(link->dhcp_routes);
190 :
191 0 : table = link_get_dhcp_route_table(link);
192 :
193 0 : r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
194 0 : if (r < 0)
195 0 : return log_link_warning_errno(link, r, "DHCP error: could not get address: %m");
196 :
197 0 : n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes);
198 0 : if (n == -ENODATA)
199 0 : log_link_debug_errno(link, n, "DHCP: No routes received from DHCP server: %m");
200 0 : else if (n < 0)
201 0 : log_link_debug_errno(link, n, "DHCP error: could not get routes: %m");
202 :
203 0 : for (i = 0; i < n; i++) {
204 0 : switch (sd_dhcp_route_get_option(static_routes[i])) {
205 0 : case SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE:
206 0 : classless_route = true;
207 0 : break;
208 0 : case SD_DHCP_OPTION_STATIC_ROUTE:
209 0 : static_route = true;
210 0 : break;
211 : }
212 0 : }
213 :
214 0 : for (i = 0; i < n; i++) {
215 0 : _cleanup_(route_freep) Route *route = NULL;
216 :
217 : /* if the DHCP server returns both a Classless Static Routes option and a Static Routes option,
218 : the DHCP client MUST ignore the Static Routes option. */
219 0 : if (classless_route &&
220 0 : sd_dhcp_route_get_option(static_routes[i]) != SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE)
221 0 : continue;
222 :
223 0 : r = route_new(&route);
224 0 : if (r < 0)
225 0 : return log_link_error_errno(link, r, "Could not allocate route: %m");
226 :
227 0 : route->family = AF_INET;
228 0 : route->protocol = RTPROT_DHCP;
229 0 : assert_se(sd_dhcp_route_get_gateway(static_routes[i], &route->gw.in) >= 0);
230 0 : assert_se(sd_dhcp_route_get_destination(static_routes[i], &route->dst.in) >= 0);
231 0 : assert_se(sd_dhcp_route_get_destination_prefix_length(static_routes[i], &route->dst_prefixlen) >= 0);
232 0 : route->priority = link->network->dhcp_route_metric;
233 0 : route->table = table;
234 0 : route->scope = route_scope_from_address(route, &address);
235 0 : if (IN_SET(route->scope, RT_SCOPE_LINK, RT_SCOPE_UNIVERSE))
236 0 : route->prefsrc.in = address;
237 :
238 0 : if (set_contains(link->dhcp_routes, route))
239 0 : continue;
240 :
241 0 : r = dhcp_route_configure(&route, link);
242 0 : if (r < 0)
243 0 : return log_link_error_errno(link, r, "Could not set route: %m");
244 : }
245 :
246 0 : r = sd_dhcp_lease_get_router(link->dhcp_lease, &router);
247 0 : if (IN_SET(r, 0, -ENODATA))
248 0 : log_link_info(link, "DHCP: No gateway received from DHCP server.");
249 0 : else if (r < 0)
250 0 : log_link_warning_errno(link, r, "DHCP error: could not get gateway: %m");
251 0 : else if (in4_addr_is_null(&router[0]))
252 0 : log_link_info(link, "DHCP: Received gateway is null.");
253 :
254 : /* According to RFC 3442: If the DHCP server returns both a Classless Static Routes option and
255 : a Router option, the DHCP client MUST ignore the Router option. */
256 0 : if (classless_route && static_route)
257 0 : log_link_warning(link, "Classless static routes received from DHCP server: ignoring static-route option and router option");
258 :
259 0 : if (r > 0 && !classless_route && !in4_addr_is_null(&router[0])) {
260 0 : _cleanup_(route_freep) Route *route = NULL, *route_gw = NULL;
261 :
262 0 : r = route_new(&route_gw);
263 0 : if (r < 0)
264 0 : return log_link_error_errno(link, r, "Could not allocate route: %m");
265 :
266 : /* The dhcp netmask may mask out the gateway. Add an explicit
267 : * route for the gw host so that we can route no matter the
268 : * netmask or existing kernel route tables. */
269 0 : route_gw->family = AF_INET;
270 0 : route_gw->dst.in = router[0];
271 0 : route_gw->dst_prefixlen = 32;
272 0 : route_gw->prefsrc.in = address;
273 0 : route_gw->scope = RT_SCOPE_LINK;
274 0 : route_gw->protocol = RTPROT_DHCP;
275 0 : route_gw->priority = link->network->dhcp_route_metric;
276 0 : route_gw->table = table;
277 :
278 0 : r = dhcp_route_configure(&route_gw, link);
279 0 : if (r < 0)
280 0 : return log_link_error_errno(link, r, "Could not set host route: %m");
281 :
282 0 : r = route_new(&route);
283 0 : if (r < 0)
284 0 : return log_link_error_errno(link, r, "Could not allocate route: %m");
285 :
286 0 : route->family = AF_INET;
287 0 : route->gw.in = router[0];
288 0 : route->prefsrc.in = address;
289 0 : route->protocol = RTPROT_DHCP;
290 0 : route->priority = link->network->dhcp_route_metric;
291 0 : route->table = table;
292 :
293 0 : r = dhcp_route_configure(&route, link);
294 0 : if (r < 0)
295 0 : return log_link_error_errno(link, r, "Could not set router: %m");
296 : }
297 :
298 0 : return link_set_dns_routes(link, &address);
299 : }
300 :
301 0 : static int dhcp_remove_routes(Link *link, sd_dhcp_lease *lease, const struct in_addr *address, bool remove_all) {
302 0 : _cleanup_free_ sd_dhcp_route **routes = NULL;
303 : uint32_t table;
304 : int n, i, r;
305 :
306 0 : assert(link);
307 0 : assert(address);
308 :
309 0 : if (!link->network->dhcp_use_routes)
310 0 : return 0;
311 :
312 0 : n = sd_dhcp_lease_get_routes(lease, &routes);
313 0 : if (IN_SET(n, 0, -ENODATA))
314 0 : return 0;
315 0 : else if (n < 0)
316 0 : return log_link_error_errno(link, n, "DHCP error: Failed to get routes: %m");
317 :
318 0 : table = link_get_dhcp_route_table(link);
319 :
320 0 : for (i = 0; i < n; i++) {
321 0 : _cleanup_(route_freep) Route *route = NULL;
322 :
323 0 : r = route_new(&route);
324 0 : if (r < 0)
325 0 : return log_oom();
326 :
327 0 : route->family = AF_INET;
328 0 : assert_se(sd_dhcp_route_get_gateway(routes[i], &route->gw.in) >= 0);
329 0 : assert_se(sd_dhcp_route_get_destination(routes[i], &route->dst.in) >= 0);
330 0 : assert_se(sd_dhcp_route_get_destination_prefix_length(routes[i], &route->dst_prefixlen) >= 0);
331 0 : route->priority = link->network->dhcp_route_metric;
332 0 : route->table = table;
333 0 : route->scope = route_scope_from_address(route, address);
334 0 : if (IN_SET(route->scope, RT_SCOPE_LINK, RT_SCOPE_UNIVERSE))
335 0 : route->prefsrc.in = *address;
336 :
337 0 : if (!remove_all && set_contains(link->dhcp_routes, route))
338 0 : continue;
339 :
340 0 : (void) route_remove(route, link, NULL);
341 : }
342 :
343 0 : return n;
344 : }
345 :
346 0 : static int dhcp_remove_router(Link *link, sd_dhcp_lease *lease, const struct in_addr *address, bool remove_all) {
347 0 : _cleanup_(route_freep) Route *route_gw = NULL, *route = NULL;
348 : const struct in_addr *router;
349 : uint32_t table;
350 : int r;
351 :
352 0 : assert(link);
353 0 : assert(address);
354 :
355 0 : if (!link->network->dhcp_use_routes)
356 0 : return 0;
357 :
358 0 : r = sd_dhcp_lease_get_router(lease, &router);
359 0 : if (IN_SET(r, 0, -ENODATA)) {
360 0 : log_link_debug(link, "DHCP: No gateway received from DHCP server.");
361 0 : return 0;
362 0 : } else if (r < 0)
363 0 : return log_link_error_errno(link, r, "DHCP error: could not get gateway: %m");
364 0 : else if (in4_addr_is_null(&router[0])) {
365 0 : log_link_info(link, "DHCP: Received gateway is null, ignoring.");
366 0 : return 0;
367 : }
368 :
369 0 : table = link_get_dhcp_route_table(link);
370 :
371 0 : r = route_new(&route_gw);
372 0 : if (r < 0)
373 0 : return log_oom();
374 :
375 0 : route_gw->family = AF_INET;
376 0 : route_gw->dst.in = router[0];
377 0 : route_gw->dst_prefixlen = 32;
378 0 : route_gw->prefsrc.in = *address;
379 0 : route_gw->scope = RT_SCOPE_LINK;
380 0 : route_gw->protocol = RTPROT_DHCP;
381 0 : route_gw->priority = link->network->dhcp_route_metric;
382 0 : route_gw->table = table;
383 :
384 0 : if (remove_all || !set_contains(link->dhcp_routes, route_gw))
385 0 : (void) route_remove(route_gw, link, NULL);
386 :
387 0 : r = route_new(&route);
388 0 : if (r < 0)
389 0 : return log_oom();
390 :
391 0 : route->family = AF_INET;
392 0 : route->gw.in = router[0];
393 0 : route->prefsrc.in = *address;
394 0 : route->protocol = RTPROT_DHCP;
395 0 : route->priority = link->network->dhcp_route_metric;
396 0 : route->table = table;
397 :
398 0 : if (remove_all || !set_contains(link->dhcp_routes, route))
399 0 : (void) route_remove(route, link, NULL);
400 :
401 0 : return 0;
402 : }
403 :
404 0 : static int dhcp_remove_dns_routes(Link *link, sd_dhcp_lease *lease, const struct in_addr *address, bool remove_all) {
405 : const struct in_addr *dns;
406 : uint32_t table;
407 : int i, n, r;
408 :
409 0 : assert(link);
410 0 : assert(lease);
411 0 : assert(link->network);
412 :
413 0 : if (!link->network->dhcp_use_dns ||
414 0 : !link->network->dhcp_routes_to_dns)
415 0 : return 0;
416 :
417 0 : n = sd_dhcp_lease_get_dns(lease, &dns);
418 0 : if (IN_SET(n, 0, -ENODATA))
419 0 : return 0;
420 0 : if (n < 0)
421 0 : return log_link_warning_errno(link, n, "DHCP error: could not get DNS servers: %m");
422 :
423 0 : table = link_get_dhcp_route_table(link);
424 :
425 0 : for (i = 0; i < n; i ++) {
426 0 : _cleanup_(route_freep) Route *route = NULL;
427 :
428 0 : r = route_new(&route);
429 0 : if (r < 0)
430 0 : return log_link_error_errno(link, r, "Could not allocate route: %m");
431 :
432 0 : route->family = AF_INET;
433 0 : route->dst.in = dns[i];
434 0 : route->dst_prefixlen = 32;
435 0 : route->prefsrc.in = *address;
436 0 : route->scope = RT_SCOPE_LINK;
437 0 : route->protocol = RTPROT_DHCP;
438 0 : route->priority = link->network->dhcp_route_metric;
439 0 : route->table = table;
440 :
441 0 : if (!remove_all && set_contains(link->dhcp_routes, route))
442 0 : continue;
443 :
444 0 : (void) route_remove(route, link, NULL);
445 : }
446 :
447 0 : return 0;
448 : }
449 :
450 0 : static int dhcp_remove_address(Link *link, sd_dhcp_lease *lease, const struct in_addr *address) {
451 0 : _cleanup_(address_freep) Address *a = NULL;
452 : struct in_addr netmask;
453 : int r;
454 :
455 0 : assert(link);
456 0 : assert(address);
457 :
458 0 : if (in4_addr_is_null(address))
459 0 : return 0;
460 :
461 0 : r = address_new(&a);
462 0 : if (r < 0)
463 0 : return log_oom();
464 :
465 0 : a->family = AF_INET;
466 0 : a->in_addr.in = *address;
467 :
468 0 : if (sd_dhcp_lease_get_netmask(lease, &netmask) >= 0)
469 0 : a->prefixlen = in4_addr_netmask_to_prefixlen(&netmask);
470 :
471 0 : (void) address_remove(a, link, NULL);
472 :
473 0 : return 0;
474 : }
475 :
476 0 : static int dhcp_reset_mtu(Link *link) {
477 : uint16_t mtu;
478 : int r;
479 :
480 0 : assert(link);
481 :
482 0 : if (!link->network->dhcp_use_mtu)
483 0 : return 0;
484 :
485 0 : r = sd_dhcp_lease_get_mtu(link->dhcp_lease, &mtu);
486 0 : if (r < 0)
487 0 : return r;
488 :
489 0 : if (link->original_mtu == mtu)
490 0 : return 0;
491 :
492 0 : r = link_set_mtu(link, link->original_mtu);
493 0 : if (r < 0) {
494 0 : log_link_error_errno(link, r, "DHCP error: could not reset MTU: %m");
495 0 : link_enter_failed(link);
496 0 : return r;
497 : }
498 :
499 0 : return 0;
500 : }
501 :
502 0 : static int dhcp_reset_hostname(Link *link) {
503 : const char *hostname;
504 : int r;
505 :
506 0 : assert(link);
507 :
508 0 : if (!link->network->dhcp_use_hostname)
509 0 : return 0;
510 :
511 0 : hostname = link->network->dhcp_hostname;
512 0 : if (!hostname)
513 0 : (void) sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname);
514 :
515 0 : if (!hostname)
516 0 : return 0;
517 :
518 : /* If a hostname was set due to the lease, then unset it now. */
519 0 : r = manager_set_hostname(link->manager, NULL);
520 0 : if (r < 0)
521 0 : return log_link_error_errno(link, r, "DHCP error: Failed to reset transient hostname: %m");
522 :
523 0 : return 0;
524 : }
525 :
526 0 : static int dhcp_lease_lost(Link *link) {
527 0 : struct in_addr address = {};
528 :
529 0 : assert(link);
530 0 : assert(link->dhcp_lease);
531 :
532 0 : log_link_warning(link, "DHCP lease lost");
533 :
534 0 : link->dhcp4_configured = false;
535 :
536 0 : (void) sd_dhcp_lease_get_address(link->dhcp_lease, &address);
537 0 : (void) dhcp_remove_routes(link, link->dhcp_lease, &address, true);
538 0 : (void) dhcp_remove_router(link, link->dhcp_lease, &address, true);
539 0 : (void) dhcp_remove_dns_routes(link, link->dhcp_lease, &address, true);
540 0 : (void) dhcp_remove_address(link, link->dhcp_lease, &address);
541 0 : (void) dhcp_reset_mtu(link);
542 0 : (void) dhcp_reset_hostname(link);
543 :
544 0 : link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
545 0 : link_dirty(link);
546 :
547 0 : return 0;
548 : }
549 :
550 0 : static int dhcp4_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
551 : int r;
552 :
553 0 : assert(link);
554 :
555 0 : if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
556 0 : return 1;
557 :
558 0 : r = sd_netlink_message_get_errno(m);
559 0 : if (r < 0 && r != -EEXIST) {
560 0 : log_link_error_errno(link, r, "Could not set DHCPv4 address: %m");
561 0 : link_enter_failed(link);
562 0 : return 1;
563 0 : } else if (r >= 0)
564 0 : (void) manager_rtnl_process_address(rtnl, m, link->manager);
565 :
566 0 : r = link_set_dhcp_routes(link);
567 0 : if (r < 0) {
568 0 : link_enter_failed(link);
569 0 : return 1;
570 : }
571 :
572 : /* Add back static routes since kernel removes while DHCPv4 address is removed from when lease expires */
573 0 : r = link_request_set_routes(link);
574 0 : if (r < 0) {
575 0 : link_enter_failed(link);
576 0 : return 1;
577 : }
578 :
579 0 : if (link->dhcp4_messages == 0) {
580 0 : link->dhcp4_configured = true;
581 : /* The new address is configured, and no route is requested.
582 : * Let's drop the old lease. */
583 0 : dhcp4_release_old_lease(link);
584 0 : link_check_ready(link);
585 : }
586 :
587 0 : return 1;
588 : }
589 :
590 0 : static int dhcp4_update_address(Link *link,
591 : struct in_addr *address,
592 : struct in_addr *netmask,
593 : uint32_t lifetime) {
594 0 : _cleanup_(address_freep) Address *addr = NULL;
595 : unsigned prefixlen;
596 : int r;
597 :
598 0 : assert(address);
599 0 : assert(netmask);
600 0 : assert(lifetime);
601 :
602 0 : prefixlen = in4_addr_netmask_to_prefixlen(netmask);
603 :
604 0 : r = address_new(&addr);
605 0 : if (r < 0)
606 0 : return r;
607 :
608 0 : addr->family = AF_INET;
609 0 : addr->in_addr.in.s_addr = address->s_addr;
610 0 : addr->cinfo.ifa_prefered = lifetime;
611 0 : addr->cinfo.ifa_valid = lifetime;
612 0 : addr->prefixlen = prefixlen;
613 0 : addr->broadcast.s_addr = address->s_addr | ~netmask->s_addr;
614 :
615 : /* allow reusing an existing address and simply update its lifetime
616 : * in case it already exists */
617 0 : r = address_configure(addr, link, dhcp4_address_handler, true);
618 0 : if (r < 0)
619 0 : return r;
620 :
621 0 : return 0;
622 : }
623 :
624 0 : static int dhcp_lease_renew(sd_dhcp_client *client, Link *link) {
625 : sd_dhcp_lease *lease;
626 : struct in_addr address;
627 : struct in_addr netmask;
628 0 : uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
629 : int r;
630 :
631 0 : assert(link);
632 0 : assert(client);
633 0 : assert(link->network);
634 :
635 0 : r = sd_dhcp_client_get_lease(client, &lease);
636 0 : if (r < 0)
637 0 : return log_link_warning_errno(link, r, "DHCP error: no lease: %m");
638 :
639 0 : sd_dhcp_lease_unref(link->dhcp_lease);
640 0 : link->dhcp4_configured = false;
641 0 : link->dhcp_lease = sd_dhcp_lease_ref(lease);
642 0 : link_dirty(link);
643 :
644 0 : r = sd_dhcp_lease_get_address(lease, &address);
645 0 : if (r < 0)
646 0 : return log_link_warning_errno(link, r, "DHCP error: no address: %m");
647 :
648 0 : r = sd_dhcp_lease_get_netmask(lease, &netmask);
649 0 : if (r < 0)
650 0 : return log_link_warning_errno(link, r, "DHCP error: no netmask: %m");
651 :
652 0 : if (!FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) {
653 0 : r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, &lifetime);
654 0 : if (r < 0)
655 0 : return log_link_warning_errno(link, r, "DHCP error: no lifetime: %m");
656 : }
657 :
658 0 : r = dhcp4_update_address(link, &address, &netmask, lifetime);
659 0 : if (r < 0)
660 0 : return log_link_warning_errno(link, r, "Could not update IP address: %m");
661 :
662 0 : return 0;
663 : }
664 :
665 0 : static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) {
666 : const struct in_addr *router;
667 : sd_dhcp_lease *lease;
668 : struct in_addr address;
669 : struct in_addr netmask;
670 : unsigned prefixlen;
671 0 : uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
672 : int r;
673 :
674 0 : assert(client);
675 0 : assert(link);
676 :
677 0 : link->dhcp4_configured = false;
678 :
679 0 : r = sd_dhcp_client_get_lease(client, &lease);
680 0 : if (r < 0)
681 0 : return log_link_error_errno(link, r, "DHCP error: No lease: %m");
682 :
683 0 : r = sd_dhcp_lease_get_address(lease, &address);
684 0 : if (r < 0)
685 0 : return log_link_error_errno(link, r, "DHCP error: No address: %m");
686 :
687 0 : r = sd_dhcp_lease_get_netmask(lease, &netmask);
688 0 : if (r < 0)
689 0 : return log_link_error_errno(link, r, "DHCP error: No netmask: %m");
690 :
691 0 : prefixlen = in4_addr_netmask_to_prefixlen(&netmask);
692 :
693 0 : if (!FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) {
694 0 : r = sd_dhcp_lease_get_lifetime(lease, &lifetime);
695 0 : if (r < 0)
696 0 : return log_link_warning_errno(link, r, "DHCP error: no lifetime: %m");
697 : }
698 :
699 0 : r = sd_dhcp_lease_get_router(lease, &router);
700 0 : if (r < 0 && r != -ENODATA)
701 0 : return log_link_error_errno(link, r, "DHCP error: Could not get gateway: %m");
702 :
703 0 : if (r > 0 && !in4_addr_is_null(&router[0]))
704 0 : log_struct(LOG_INFO,
705 : LOG_LINK_INTERFACE(link),
706 : LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u",
707 : ADDRESS_FMT_VAL(address),
708 : prefixlen,
709 : ADDRESS_FMT_VAL(router[0])),
710 : "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address),
711 : "PREFIXLEN=%u", prefixlen,
712 : "GATEWAY=%u.%u.%u.%u", ADDRESS_FMT_VAL(router[0]));
713 : else
714 0 : log_struct(LOG_INFO,
715 : LOG_LINK_INTERFACE(link),
716 : LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u",
717 : ADDRESS_FMT_VAL(address),
718 : prefixlen),
719 : "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address),
720 : "PREFIXLEN=%u", prefixlen);
721 :
722 0 : link->dhcp_lease = sd_dhcp_lease_ref(lease);
723 0 : link_dirty(link);
724 :
725 0 : if (link->network->dhcp_use_mtu) {
726 : uint16_t mtu;
727 :
728 0 : r = sd_dhcp_lease_get_mtu(lease, &mtu);
729 0 : if (r >= 0) {
730 0 : r = link_set_mtu(link, mtu);
731 0 : if (r < 0)
732 0 : log_link_error_errno(link, r, "Failed to set MTU to %" PRIu16 ": %m", mtu);
733 : }
734 : }
735 :
736 0 : if (link->network->dhcp_use_hostname) {
737 0 : const char *dhcpname = NULL;
738 0 : _cleanup_free_ char *hostname = NULL;
739 :
740 0 : if (link->network->dhcp_hostname)
741 0 : dhcpname = link->network->dhcp_hostname;
742 : else
743 0 : (void) sd_dhcp_lease_get_hostname(lease, &dhcpname);
744 :
745 0 : if (dhcpname) {
746 0 : r = shorten_overlong(dhcpname, &hostname);
747 0 : if (r < 0)
748 0 : log_link_warning_errno(link, r, "Unable to shorten overlong DHCP hostname '%s', ignoring: %m", dhcpname);
749 0 : if (r == 1)
750 0 : log_link_notice(link, "Overlong DHCP hostname received, shortened from '%s' to '%s'", dhcpname, hostname);
751 : }
752 :
753 0 : if (hostname) {
754 0 : r = manager_set_hostname(link->manager, hostname);
755 0 : if (r < 0)
756 0 : log_link_error_errno(link, r, "Failed to set transient hostname to '%s': %m", hostname);
757 : }
758 : }
759 :
760 0 : if (link->network->dhcp_use_timezone) {
761 0 : const char *tz = NULL;
762 :
763 0 : (void) sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
764 :
765 0 : if (tz) {
766 0 : r = manager_set_timezone(link->manager, tz);
767 0 : if (r < 0)
768 0 : log_link_error_errno(link, r, "Failed to set timezone to '%s': %m", tz);
769 : }
770 : }
771 :
772 0 : r = dhcp4_update_address(link, &address, &netmask, lifetime);
773 0 : if (r < 0)
774 0 : return log_link_warning_errno(link, r, "Could not update IP address: %m");
775 :
776 0 : return 0;
777 : }
778 :
779 0 : static int dhcp_lease_ip_change(sd_dhcp_client *client, Link *link) {
780 : int r;
781 :
782 0 : link->dhcp_lease_old = TAKE_PTR(link->dhcp_lease);
783 :
784 : /* On ip address change, to keep the connectability, we would like to assign new address and
785 : * routes, and then release old lease. There are two possible success paths:
786 : *
787 : * 1. new address and routes are configured.
788 : * -> handled by dhcp_release_old_lease() in dhcp4_route_handler().
789 : * 2. new address is configured and no route is requested.
790 : * -> handled by dhcp_release_old_lease() in dhcp4_address_handler().
791 : *
792 : * On error in assigning new address and routes, then the link always enters to the failed
793 : * state. And link_enter_failed() leads to the DHCP client to be stopped. So,
794 : * dhcp_release_old_lease() will be also called by link_stop_clients().
795 : */
796 :
797 0 : r = dhcp_lease_acquired(client, link);
798 0 : if (r < 0) {
799 : /* If it fails, then the new address is not configured yet.
800 : * So, let's simply drop the old lease. */
801 0 : sd_dhcp_lease_unref(link->dhcp_lease);
802 0 : link->dhcp_lease = TAKE_PTR(link->dhcp_lease_old);
803 0 : (void) dhcp_lease_lost(link);
804 0 : return r;
805 : }
806 :
807 0 : return 0;
808 : }
809 :
810 0 : static int dhcp_server_is_black_listed(Link *link, sd_dhcp_client *client) {
811 : sd_dhcp_lease *lease;
812 : struct in_addr addr;
813 : int r;
814 :
815 0 : assert(link);
816 0 : assert(link->network);
817 0 : assert(client);
818 :
819 0 : r = sd_dhcp_client_get_lease(client, &lease);
820 0 : if (r < 0)
821 0 : return log_link_error_errno(link, r, "Failed to get DHCP lease: %m");
822 :
823 0 : r = sd_dhcp_lease_get_server_identifier(lease, &addr);
824 0 : if (r < 0)
825 0 : return log_link_debug_errno(link, r, "Failed to get DHCP server ip address: %m");
826 :
827 0 : if (set_contains(link->network->dhcp_black_listed_ip, UINT32_TO_PTR(addr.s_addr))) {
828 0 : log_struct(LOG_DEBUG,
829 : LOG_LINK_INTERFACE(link),
830 : LOG_LINK_MESSAGE(link, "DHCPv4 ip '%u.%u.%u.%u' found in black listed ip addresses, ignoring offer",
831 : ADDRESS_FMT_VAL(addr)));
832 0 : return true;
833 : }
834 :
835 0 : return false;
836 : }
837 :
838 0 : static int dhcp4_handler(sd_dhcp_client *client, int event, void *userdata) {
839 0 : Link *link = userdata;
840 : int r;
841 :
842 0 : assert(link);
843 0 : assert(link->network);
844 0 : assert(link->manager);
845 :
846 0 : if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
847 0 : return 0;
848 :
849 0 : switch (event) {
850 0 : case SD_DHCP_CLIENT_EVENT_STOP:
851 :
852 0 : if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4)) {
853 0 : assert(link->ipv4ll);
854 :
855 0 : log_link_debug(link, "DHCP client is stopped. Acquiring IPv4 link-local address");
856 :
857 0 : r = sd_ipv4ll_start(link->ipv4ll);
858 0 : if (r < 0)
859 0 : return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
860 : }
861 :
862 0 : if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) {
863 0 : log_link_notice(link, "DHCPv4 connection considered critical, ignoring request to reconfigure it.");
864 0 : return 0;
865 : }
866 :
867 0 : if (link->network->dhcp_send_release)
868 0 : (void) sd_dhcp_client_send_release(client);
869 :
870 0 : if (link->dhcp_lease) {
871 0 : r = dhcp_lease_lost(link);
872 0 : if (r < 0) {
873 0 : link_enter_failed(link);
874 0 : return r;
875 : }
876 : }
877 :
878 0 : break;
879 0 : case SD_DHCP_CLIENT_EVENT_EXPIRED:
880 0 : if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) {
881 0 : log_link_notice(link, "DHCPv4 connection considered critical, ignoring request to reconfigure it.");
882 0 : return 0;
883 : }
884 :
885 0 : if (link->dhcp_lease) {
886 0 : r = dhcp_lease_lost(link);
887 0 : if (r < 0) {
888 0 : link_enter_failed(link);
889 0 : return r;
890 : }
891 : }
892 :
893 0 : break;
894 0 : case SD_DHCP_CLIENT_EVENT_IP_CHANGE:
895 0 : if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) {
896 0 : log_link_notice(link, "DHCPv4 connection considered critical, ignoring request to reconfigure it.");
897 0 : return 0;
898 : }
899 :
900 0 : r = dhcp_lease_ip_change(client, link);
901 0 : if (r < 0) {
902 0 : link_enter_failed(link);
903 0 : return r;
904 : }
905 :
906 0 : break;
907 0 : case SD_DHCP_CLIENT_EVENT_RENEW:
908 0 : r = dhcp_lease_renew(client, link);
909 0 : if (r < 0) {
910 0 : link_enter_failed(link);
911 0 : return r;
912 : }
913 0 : break;
914 0 : case SD_DHCP_CLIENT_EVENT_IP_ACQUIRE:
915 0 : r = dhcp_lease_acquired(client, link);
916 0 : if (r < 0) {
917 0 : link_enter_failed(link);
918 0 : return r;
919 : }
920 0 : break;
921 0 : case SD_DHCP_CLIENT_EVENT_SELECTING:
922 0 : r = dhcp_server_is_black_listed(link, client);
923 0 : if (r < 0)
924 0 : return r;
925 0 : if (r != 0)
926 0 : return -ENOMSG;
927 0 : break;
928 0 : default:
929 0 : if (event < 0)
930 0 : log_link_warning_errno(link, event, "DHCP error: Client failed: %m");
931 : else
932 0 : log_link_warning(link, "DHCP unknown event: %i", event);
933 0 : break;
934 : }
935 :
936 0 : return 0;
937 : }
938 :
939 0 : static int dhcp4_set_hostname(Link *link) {
940 0 : _cleanup_free_ char *hostname = NULL;
941 : const char *hn;
942 : int r;
943 :
944 0 : assert(link);
945 :
946 0 : if (!link->network->dhcp_send_hostname)
947 0 : hn = NULL;
948 0 : else if (link->network->dhcp_hostname)
949 0 : hn = link->network->dhcp_hostname;
950 : else {
951 0 : r = gethostname_strict(&hostname);
952 0 : if (r < 0 && r != -ENXIO) /* ENXIO: no hostname set or hostname is "localhost" */
953 0 : return r;
954 :
955 0 : hn = hostname;
956 : }
957 :
958 0 : r = sd_dhcp_client_set_hostname(link->dhcp_client, hn);
959 0 : if (r == -EINVAL && hostname)
960 : /* Ignore error when the machine's hostname is not suitable to send in DHCP packet. */
961 0 : log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set hostname from kernel hostname, ignoring: %m");
962 0 : else if (r < 0)
963 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set hostname: %m");
964 :
965 0 : return 0;
966 : }
967 :
968 0 : static bool promote_secondaries_enabled(const char *ifname) {
969 0 : _cleanup_free_ char *promote_secondaries_sysctl = NULL;
970 : char *promote_secondaries_path;
971 : int r;
972 :
973 0 : promote_secondaries_path = strjoina("net/ipv4/conf/", ifname, "/promote_secondaries");
974 0 : r = sysctl_read(promote_secondaries_path, &promote_secondaries_sysctl);
975 0 : if (r < 0) {
976 0 : log_debug_errno(r, "Cannot read sysctl %s", promote_secondaries_path);
977 0 : return false;
978 : }
979 :
980 0 : truncate_nl(promote_secondaries_sysctl);
981 0 : r = parse_boolean(promote_secondaries_sysctl);
982 0 : if (r < 0)
983 0 : log_warning_errno(r, "Cannot parse sysctl %s with content %s as boolean", promote_secondaries_path, promote_secondaries_sysctl);
984 0 : return r > 0;
985 : }
986 :
987 : /* dhcp4_set_promote_secondaries will ensure this interface has
988 : * the "promote_secondaries" option in the kernel set. If this sysctl
989 : * is not set DHCP will work only as long as the IP address does not
990 : * changes between leases. The kernel will remove all secondary IP
991 : * addresses of an interface otherwise. The way systemd-network works
992 : * is that the new IP of a lease is added as a secondary IP and when
993 : * the primary one expires it relies on the kernel to promote the
994 : * secondary IP. See also https://github.com/systemd/systemd/issues/7163
995 : */
996 0 : int dhcp4_set_promote_secondaries(Link *link) {
997 : int r;
998 :
999 0 : assert(link);
1000 0 : assert(link->network);
1001 0 : assert(link->network->dhcp & ADDRESS_FAMILY_IPV4);
1002 :
1003 : /* check if the kernel has promote_secondaries enabled for our
1004 : * interface. If it is not globally enabled or enabled for the
1005 : * specific interface we must either enable it.
1006 : */
1007 0 : if (!(promote_secondaries_enabled("all") || promote_secondaries_enabled(link->ifname))) {
1008 0 : char *promote_secondaries_path = NULL;
1009 :
1010 0 : log_link_debug(link, "promote_secondaries is unset, setting it");
1011 0 : promote_secondaries_path = strjoina("net/ipv4/conf/", link->ifname, "/promote_secondaries");
1012 0 : r = sysctl_write(promote_secondaries_path, "1");
1013 0 : if (r < 0)
1014 0 : log_link_warning_errno(link, r, "cannot set sysctl %s to 1", promote_secondaries_path);
1015 0 : return r > 0;
1016 : }
1017 :
1018 0 : return 0;
1019 : }
1020 :
1021 0 : int dhcp4_set_client_identifier(Link *link) {
1022 : int r;
1023 :
1024 0 : assert(link);
1025 0 : assert(link->network);
1026 0 : assert(link->dhcp_client);
1027 :
1028 0 : switch (link->network->dhcp_client_identifier) {
1029 0 : case DHCP_CLIENT_ID_DUID: {
1030 : /* If configured, apply user specified DUID and IAID */
1031 0 : const DUID *duid = link_get_duid(link);
1032 :
1033 0 : if (duid->type == DUID_TYPE_LLT && duid->raw_data_len == 0)
1034 0 : r = sd_dhcp_client_set_iaid_duid_llt(link->dhcp_client,
1035 0 : link->network->iaid_set,
1036 0 : link->network->iaid,
1037 : duid->llt_time);
1038 : else
1039 0 : r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
1040 0 : link->network->iaid_set,
1041 0 : link->network->iaid,
1042 0 : duid->type,
1043 0 : duid->raw_data_len > 0 ? duid->raw_data : NULL,
1044 0 : duid->raw_data_len);
1045 0 : if (r < 0)
1046 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set IAID+DUID: %m");
1047 0 : break;
1048 : }
1049 0 : case DHCP_CLIENT_ID_DUID_ONLY: {
1050 : /* If configured, apply user specified DUID */
1051 0 : const DUID *duid = link_get_duid(link);
1052 :
1053 0 : if (duid->type == DUID_TYPE_LLT && duid->raw_data_len == 0)
1054 0 : r = sd_dhcp_client_set_duid_llt(link->dhcp_client,
1055 : duid->llt_time);
1056 : else
1057 0 : r = sd_dhcp_client_set_duid(link->dhcp_client,
1058 0 : duid->type,
1059 0 : duid->raw_data_len > 0 ? duid->raw_data : NULL,
1060 0 : duid->raw_data_len);
1061 0 : if (r < 0)
1062 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set DUID: %m");
1063 0 : break;
1064 : }
1065 0 : case DHCP_CLIENT_ID_MAC:
1066 0 : r = sd_dhcp_client_set_client_id(link->dhcp_client,
1067 : ARPHRD_ETHER,
1068 0 : (const uint8_t *) &link->mac,
1069 : sizeof(link->mac));
1070 0 : if (r < 0)
1071 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set client ID: %m");
1072 0 : break;
1073 0 : default:
1074 0 : assert_not_reached("Unknown client identifier type.");
1075 : }
1076 :
1077 0 : return 0;
1078 : }
1079 :
1080 0 : int dhcp4_configure(Link *link) {
1081 : int r;
1082 :
1083 0 : assert(link);
1084 0 : assert(link->network);
1085 0 : assert(link->network->dhcp & ADDRESS_FAMILY_IPV4);
1086 :
1087 0 : if (!link->dhcp_client) {
1088 0 : r = sd_dhcp_client_new(&link->dhcp_client, link->network->dhcp_anonymize);
1089 0 : if (r == -ENOMEM)
1090 0 : return log_oom();
1091 0 : if (r < 0)
1092 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to create DHCP4 client: %m");
1093 : }
1094 :
1095 0 : r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
1096 0 : if (r < 0)
1097 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to attach event: %m");
1098 :
1099 0 : r = sd_dhcp_client_set_mac(link->dhcp_client,
1100 0 : (const uint8_t *) &link->mac,
1101 : sizeof (link->mac), ARPHRD_ETHER);
1102 0 : if (r < 0)
1103 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set MAC address: %m");
1104 :
1105 0 : r = sd_dhcp_client_set_ifindex(link->dhcp_client, link->ifindex);
1106 0 : if (r < 0)
1107 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set ifindex: %m");
1108 :
1109 0 : r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp4_handler, link);
1110 0 : if (r < 0)
1111 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set callback: %m");
1112 :
1113 0 : r = sd_dhcp_client_set_request_broadcast(link->dhcp_client,
1114 0 : link->network->dhcp_broadcast);
1115 0 : if (r < 0)
1116 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for broadcast: %m");
1117 :
1118 0 : if (link->mtu) {
1119 0 : r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
1120 0 : if (r < 0)
1121 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set MTU: %m");
1122 : }
1123 :
1124 0 : if (link->network->dhcp_use_mtu) {
1125 0 : r = sd_dhcp_client_set_request_option(link->dhcp_client,
1126 : SD_DHCP_OPTION_INTERFACE_MTU);
1127 0 : if (r < 0)
1128 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for MTU: %m");
1129 : }
1130 :
1131 : /* NOTE: even if this variable is called "use", it also "sends" PRL
1132 : * options, maybe there should be a different configuration variable
1133 : * to send or not route options?. */
1134 : /* NOTE: when using Anonymize=yes, routes PRL options are sent
1135 : * by default, so they don't need to be added here. */
1136 0 : if (link->network->dhcp_use_routes && !link->network->dhcp_anonymize) {
1137 0 : r = sd_dhcp_client_set_request_option(link->dhcp_client,
1138 : SD_DHCP_OPTION_STATIC_ROUTE);
1139 0 : if (r < 0)
1140 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for static route: %m");
1141 :
1142 0 : r = sd_dhcp_client_set_request_option(link->dhcp_client,
1143 : SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE);
1144 0 : if (r < 0)
1145 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for classless static route: %m");
1146 : }
1147 :
1148 0 : if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO && !link->network->dhcp_anonymize) {
1149 0 : r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_DOMAIN_SEARCH_LIST);
1150 0 : if (r < 0)
1151 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for domain search list: %m");
1152 : }
1153 :
1154 0 : if (link->network->dhcp_use_ntp) {
1155 0 : r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NTP_SERVER);
1156 0 : if (r < 0)
1157 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for NTP server: %m");
1158 : }
1159 :
1160 0 : if (link->network->dhcp_use_timezone) {
1161 0 : r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NEW_TZDB_TIMEZONE);
1162 0 : if (r < 0)
1163 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for timezone: %m");
1164 : }
1165 :
1166 0 : r = dhcp4_set_hostname(link);
1167 0 : if (r < 0)
1168 0 : return r;
1169 :
1170 0 : if (link->network->dhcp_vendor_class_identifier) {
1171 0 : r = sd_dhcp_client_set_vendor_class_identifier(link->dhcp_client,
1172 0 : link->network->dhcp_vendor_class_identifier);
1173 0 : if (r < 0)
1174 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set vendor class identifier: %m");
1175 : }
1176 :
1177 0 : if (link->network->dhcp_user_class) {
1178 0 : r = sd_dhcp_client_set_user_class(link->dhcp_client, (const char **) link->network->dhcp_user_class);
1179 0 : if (r < 0)
1180 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set user class: %m");
1181 : }
1182 :
1183 0 : if (link->network->dhcp_client_port) {
1184 0 : r = sd_dhcp_client_set_client_port(link->dhcp_client, link->network->dhcp_client_port);
1185 0 : if (r < 0)
1186 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set listen port: %m");
1187 : }
1188 :
1189 0 : if (link->network->dhcp_max_attempts > 0) {
1190 0 : r = sd_dhcp_client_set_max_attempts(link->dhcp_client, link->network->dhcp_max_attempts);
1191 0 : if (r < 0)
1192 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set max attempts: %m");
1193 : }
1194 :
1195 0 : return dhcp4_set_client_identifier(link);
1196 : }
1197 :
1198 0 : int config_parse_dhcp_max_attempts(
1199 : const char *unit,
1200 : const char *filename,
1201 : unsigned line,
1202 : const char *section,
1203 : unsigned section_line,
1204 : const char *lvalue,
1205 : int ltype,
1206 : const char *rvalue,
1207 : void *data,
1208 : void *userdata) {
1209 :
1210 0 : Network *network = data;
1211 : uint64_t a;
1212 : int r;
1213 :
1214 0 : assert(network);
1215 0 : assert(lvalue);
1216 0 : assert(rvalue);
1217 :
1218 0 : if (isempty(rvalue)) {
1219 0 : network->dhcp_max_attempts = 0;
1220 0 : return 0;
1221 : }
1222 :
1223 0 : if (streq(rvalue, "infinity")) {
1224 0 : network->dhcp_max_attempts = (uint64_t) -1;
1225 0 : return 0;
1226 : }
1227 :
1228 0 : r = safe_atou64(rvalue, &a);
1229 0 : if (r < 0) {
1230 0 : log_syntax(unit, LOG_ERR, filename, line, r,
1231 : "Failed to parse DHCP maximum attempts, ignoring: %s", rvalue);
1232 0 : return 0;
1233 : }
1234 :
1235 0 : if (a == 0) {
1236 0 : log_syntax(unit, LOG_ERR, filename, line, 0,
1237 : "%s= must be positive integer or 'infinity', ignoring: %s", lvalue, rvalue);
1238 0 : return 0;
1239 : }
1240 :
1241 0 : network->dhcp_max_attempts = a;
1242 :
1243 0 : return 0;
1244 : }
1245 :
1246 0 : int config_parse_dhcp_black_listed_ip_address(
1247 : const char *unit,
1248 : const char *filename,
1249 : unsigned line,
1250 : const char *section,
1251 : unsigned section_line,
1252 : const char *lvalue,
1253 : int ltype,
1254 : const char *rvalue,
1255 : void *data,
1256 : void *userdata) {
1257 :
1258 0 : Network *network = data;
1259 : const char *p;
1260 : int r;
1261 :
1262 0 : assert(filename);
1263 0 : assert(lvalue);
1264 0 : assert(rvalue);
1265 0 : assert(data);
1266 :
1267 0 : if (isempty(rvalue)) {
1268 0 : network->dhcp_black_listed_ip = set_free(network->dhcp_black_listed_ip);
1269 0 : return 0;
1270 : }
1271 :
1272 0 : for (p = rvalue;;) {
1273 0 : _cleanup_free_ char *n = NULL;
1274 : union in_addr_union ip;
1275 :
1276 0 : r = extract_first_word(&p, &n, NULL, 0);
1277 0 : if (r < 0) {
1278 0 : log_syntax(unit, LOG_ERR, filename, line, r,
1279 : "Failed to parse DHCP black listed ip address, ignoring assignment: %s",
1280 : rvalue);
1281 0 : return 0;
1282 : }
1283 0 : if (r == 0)
1284 0 : return 0;
1285 :
1286 0 : r = in_addr_from_string(AF_INET, n, &ip);
1287 0 : if (r < 0) {
1288 0 : log_syntax(unit, LOG_ERR, filename, line, r,
1289 : "DHCP black listed ip address is invalid, ignoring assignment: %s", n);
1290 0 : continue;
1291 : }
1292 :
1293 0 : r = set_ensure_allocated(&network->dhcp_black_listed_ip, NULL);
1294 0 : if (r < 0)
1295 0 : return log_oom();
1296 :
1297 0 : r = set_put(network->dhcp_black_listed_ip, UINT32_TO_PTR(ip.in.s_addr));
1298 0 : if (r < 0)
1299 0 : log_syntax(unit, LOG_ERR, filename, line, r,
1300 : "Failed to store DHCP black listed ip address '%s', ignoring assignment: %m", n);
1301 : }
1302 :
1303 : return 0;
1304 : }
1305 :
1306 0 : int config_parse_dhcp_user_class(
1307 : const char *unit,
1308 : const char *filename,
1309 : unsigned line,
1310 : const char *section,
1311 : unsigned section_line,
1312 : const char *lvalue,
1313 : int ltype,
1314 : const char *rvalue,
1315 : void *data,
1316 : void *userdata) {
1317 :
1318 0 : char ***l = data;
1319 : int r;
1320 :
1321 0 : assert(l);
1322 0 : assert(lvalue);
1323 0 : assert(rvalue);
1324 :
1325 0 : if (isempty(rvalue)) {
1326 0 : *l = strv_free(*l);
1327 0 : return 0;
1328 : }
1329 :
1330 0 : for (;;) {
1331 0 : _cleanup_free_ char *w = NULL;
1332 :
1333 0 : r = extract_first_word(&rvalue, &w, NULL, 0);
1334 0 : if (r == -ENOMEM)
1335 0 : return log_oom();
1336 0 : if (r < 0) {
1337 0 : log_syntax(unit, LOG_ERR, filename, line, r,
1338 : "Failed to split user classes option, ignoring: %s", rvalue);
1339 0 : break;
1340 : }
1341 0 : if (r == 0)
1342 0 : break;
1343 :
1344 0 : if (strlen(w) > 255) {
1345 0 : log_syntax(unit, LOG_ERR, filename, line, 0,
1346 : "%s length is not in the range 1-255, ignoring.", w);
1347 0 : continue;
1348 : }
1349 :
1350 0 : r = strv_push(l, w);
1351 0 : if (r < 0)
1352 0 : return log_oom();
1353 :
1354 0 : w = NULL;
1355 : }
1356 :
1357 0 : return 0;
1358 : }
1359 :
1360 : static const char* const dhcp_client_identifier_table[_DHCP_CLIENT_ID_MAX] = {
1361 : [DHCP_CLIENT_ID_MAC] = "mac",
1362 : [DHCP_CLIENT_ID_DUID] = "duid",
1363 : [DHCP_CLIENT_ID_DUID_ONLY] = "duid-only",
1364 : };
1365 :
1366 0 : DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(dhcp_client_identifier, DHCPClientIdentifier);
1367 0 : DEFINE_CONFIG_PARSE_ENUM(config_parse_dhcp_client_identifier, dhcp_client_identifier, DHCPClientIdentifier,
1368 : "Failed to parse client identifier type");
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