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network: use route_remove_handler() as the default callback of route_remove()
[thirdparty/systemd.git] / src / network / networkd-dhcp4.c
CommitLineData
53e1b683 1/* SPDX-License-Identifier: LGPL-2.1+ */
3c9b8860
TG		 2
3#include <netinet/ether.h>
4#include <linux/if.h>
5
b5efdb8a 6#include "alloc-util.h"
958b66ea 7#include "hostname-util.h"
64b21ece 8#include "parse-util.h"
fc1ba79d 9#include "netdev/vrf.h"
3c9b8860 10#include "network-internal.h"
23f53b99
TG		 11#include "networkd-link.h"
12#include "networkd-manager.h"
13#include "networkd-network.h"
64b21ece
MV		 14#include "string-util.h"
15#include "sysctl-util.h"
3c9b8860 16
1c4baffc 17static int dhcp4_route_handler(sd_netlink *rtnl, sd_netlink_message *m,
3c9b8860 18 void *userdata) {
1046bf9b 19 Link *link = userdata;
3c9b8860
TG		 20 int r;
21
22 assert(link);
6cf4a01c 23 assert(link->dhcp4_messages > 0);
3c9b8860 24
313cefa1 25 link->dhcp4_messages--;
3c9b8860 26
1c4baffc 27 r = sd_netlink_message_get_errno(m);
3c9b8860 28 if (r < 0 && r != -EEXIST) {
f6b8196f 29 log_link_error_errno(link, r, "Could not set DHCPv4 route: %m");
3c9b8860
TG		 30 link_enter_failed(link);
31 }
32
6cf4a01c 33 if (link->dhcp4_messages == 0) {
3c9b8860 34 link->dhcp4_configured = true;
8012cd39 35 link_check_ready(link);
3c9b8860
TG		 36 }
37
38 return 1;
39}
40
d6eac9bd
DW		 41static int route_scope_from_address(const Route *route, const struct in_addr *self_addr) {
42 assert(route);
43 assert(self_addr);
44
45 if (in_addr_is_localhost(AF_INET, &route->dst) ||
46 (self_addr->s_addr && route->dst.in.s_addr == self_addr->s_addr))
47 return RT_SCOPE_HOST;
48 else if (in4_addr_is_null(&route->gw.in))
49 return RT_SCOPE_LINK;
50 else
51 return RT_SCOPE_UNIVERSE;
52}
53
3c9b8860 54static int link_set_dhcp_routes(Link *link) {
f8693fc7 55 _cleanup_free_ sd_dhcp_route **static_routes = NULL;
8cdc46e7
SS		 56 bool classless_route = false, static_route = false;
57 struct in_addr gateway, address;
3c9b8860 58 int r, n, i;
fc1ba79d 59 uint32_t table;
3c9b8860
TG		 60
61 assert(link);
0c9b15a3
AJ		 62
63 if (!link->dhcp_lease) /* link went down while we configured the IP addresses? */
64 return 0;
65
66 if (!link->network) /* link went down while we configured the IP addresses? */
67 return 0;
964b26fe
SS		 68
69 if (!link->network->dhcp_use_routes)
70 return 0;
3c9b8860 71
fc1ba79d
AR		 72 /* When the interface is part of an VRF use the VRFs routing table, unless
73 * there is a another table specified. */
74 table = link->network->dhcp_route_table;
75 if (!link->network->dhcp_route_table_set && link->network->vrf != NULL)
76 table = VRF(link->network->vrf)->table;
77
b23aec0d
DW		 78 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
79 if (r < 0)
80 return log_link_warning_errno(link, r, "DHCP error: could not get address: %m");
81
5f04a209 82 n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes);
599c44e6
YW		 83 if (n == -ENODATA)
84 log_link_debug_errno(link, n, "DHCP: No routes received from DHCP server: %m");
85 else if (n < 0)
8dc787d1 86 log_link_debug_errno(link, n, "DHCP error: could not get routes: %m");
5f04a209 87
8cdc46e7 88 for (i = 0; i < n; i++) {
3476951c
TH		 89 switch (sd_dhcp_route_get_option(static_routes[i])) {
90 case SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE:
8cdc46e7 91 classless_route = true;
3476951c
TH		 92 break;
93 case SD_DHCP_OPTION_STATIC_ROUTE:
8cdc46e7 94 static_route = true;
3476951c
TH		 95 break;
96 }
8cdc46e7
SS		 97 }
98
5f04a209 99 for (i = 0; i < n; i++) {
8e766630 100 _cleanup_(route_freep) Route *route = NULL;
5f04a209 101
8cdc46e7
SS		 102 /* if the DHCP server returns both a Classless Static Routes option and a Static Routes option,
103 the DHCP client MUST ignore the Static Routes option. */
3476951c
TH		 104 if (classless_route &&
105 sd_dhcp_route_get_option(static_routes[i]) != SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE)
8cdc46e7
SS		 106 continue;
107
5f04a209
SS		 108 r = route_new(&route);
109 if (r < 0)
110 return log_link_error_errno(link, r, "Could not allocate route: %m");
111
112 route->family = AF_INET;
113 route->protocol = RTPROT_DHCP;
114 assert_se(sd_dhcp_route_get_gateway(static_routes[i], &route->gw.in) >= 0);
115 assert_se(sd_dhcp_route_get_destination(static_routes[i], &route->dst.in) >= 0);
116 assert_se(sd_dhcp_route_get_destination_prefix_length(static_routes[i], &route->dst_prefixlen) >= 0);
117 route->priority = link->network->dhcp_route_metric;
118 route->table = table;
119 route->scope = route_scope_from_address(route, &address);
120
121 r = route_configure(route, link, dhcp4_route_handler);
122 if (r < 0)
123 return log_link_warning_errno(link, r, "Could not set host route: %m");
124
125 link->dhcp4_messages++;
126 }
127
3c9b8860 128 r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
444b0170 129 if (r == -ENODATA)
fb14aa7e 130 log_link_info_errno(link, r, "DHCP: No gateway received from DHCP server: %m");
444b0170
SS		 131 else if (r < 0)
132 log_link_warning_errno(link, r, "DHCP error: could not get gateway: %m");
f6b8196f 133
5f04a209
SS		 134 /* According to RFC 3442: If the DHCP server returns both a Classless Static Routes option and
135 a Router option, the DHCP client MUST ignore the Router option. */
8cdc46e7
SS		 136 if (classless_route && static_route)
137 log_link_warning(link, "Classless static routes received from DHCP server: ignoring static-route option and router option");
138
139 if (r >= 0 && !classless_route) {
8e766630
LP		 140 _cleanup_(route_freep) Route *route = NULL;
141 _cleanup_(route_freep) Route *route_gw = NULL;
3c9b8860 142
ed9e361a 143 r = route_new(&route);
f6b8196f
LP		 144 if (r < 0)
145 return log_link_error_errno(link, r, "Could not allocate route: %m");
3c9b8860 146
ed9e361a
TG		 147 route->protocol = RTPROT_DHCP;
148
149 r = route_new(&route_gw);
f6b8196f
LP		 150 if (r < 0)
151 return log_link_error_errno(link, r, "Could not allocate route: %m");
3c9b8860
TG		 152
153 /* The dhcp netmask may mask out the gateway. Add an explicit
154 * route for the gw host so that we can route no matter the
155 * netmask or existing kernel route tables. */
156 route_gw->family = AF_INET;
2ce40956 157 route_gw->dst.in = gateway;
3c9b8860 158 route_gw->dst_prefixlen = 32;
2ce40956 159 route_gw->prefsrc.in = address;
3c9b8860 160 route_gw->scope = RT_SCOPE_LINK;
ed9e361a 161 route_gw->protocol = RTPROT_DHCP;
86655331 162 route_gw->priority = link->network->dhcp_route_metric;
fc1ba79d 163 route_gw->table = table;
3c9b8860 164
483d099e 165 r = route_configure(route_gw, link, dhcp4_route_handler);
f6b8196f
LP		 166 if (r < 0)
167 return log_link_warning_errno(link, r, "Could not set host route: %m");
3c9b8860 168
313cefa1 169 link->dhcp4_messages++;
3c9b8860
TG		 170
171 route->family = AF_INET;
2ce40956
TG		 172 route->gw.in = gateway;
173 route->prefsrc.in = address;
86655331 174 route->priority = link->network->dhcp_route_metric;
fc1ba79d 175 route->table = table;
3c9b8860 176
483d099e 177 r = route_configure(route, link, dhcp4_route_handler);
3c9b8860 178 if (r < 0) {
f6b8196f 179 log_link_warning_errno(link, r, "Could not set routes: %m");
3c9b8860
TG		 180 link_enter_failed(link);
181 return r;
182 }
183
313cefa1 184 link->dhcp4_messages++;
3c9b8860
TG		 185 }
186
3c9b8860
TG		 187 return 0;
188}
189
190static int dhcp_lease_lost(Link *link) {
8e766630 191 _cleanup_(address_freep) Address *address = NULL;
3c9b8860
TG		 192 struct in_addr addr;
193 struct in_addr netmask;
194 struct in_addr gateway;
f414a269 195 unsigned prefixlen = 0;
3c9b8860
TG		 196 int r;
197
198 assert(link);
199 assert(link->dhcp_lease);
200
79008bdd 201 log_link_warning(link, "DHCP lease lost");
3c9b8860 202
27cb34f5 203 if (link->network->dhcp_use_routes) {
f8693fc7 204 _cleanup_free_ sd_dhcp_route **routes = NULL;
3c9b8860
TG		 205 int n, i;
206
207 n = sd_dhcp_lease_get_routes(link->dhcp_lease, &routes);
208 if (n >= 0) {
209 for (i = 0; i < n; i++) {
8e766630 210 _cleanup_(route_freep) Route *route = NULL;
3c9b8860 211
ed9e361a 212 r = route_new(&route);
3c9b8860
TG		 213 if (r >= 0) {
214 route->family = AF_INET;
f8693fc7
BG		 215 assert_se(sd_dhcp_route_get_gateway(routes[i], &route->gw.in) >= 0);
216 assert_se(sd_dhcp_route_get_destination(routes[i], &route->dst.in) >= 0);
217 assert_se(sd_dhcp_route_get_destination_prefix_length(routes[i], &route->dst_prefixlen) >= 0);
3c9b8860 218
4645ad47 219 route_remove(route, link, NULL);
3c9b8860
TG		 220 }
221 }
222 }
223 }
224
f0213e37 225 r = address_new(&address);
3c9b8860
TG		 226 if (r >= 0) {
227 r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
228 if (r >= 0) {
8e766630
LP		 229 _cleanup_(route_freep) Route *route_gw = NULL;
230 _cleanup_(route_freep) Route *route = NULL;
3c9b8860 231
ed9e361a 232 r = route_new(&route_gw);
3c9b8860
TG		 233 if (r >= 0) {
234 route_gw->family = AF_INET;
2ce40956 235 route_gw->dst.in = gateway;
3c9b8860
TG		 236 route_gw->dst_prefixlen = 32;
237 route_gw->scope = RT_SCOPE_LINK;
238
4645ad47 239 route_remove(route_gw, link, NULL);
3c9b8860
TG		 240 }
241
ed9e361a 242 r = route_new(&route);
3c9b8860
TG		 243 if (r >= 0) {
244 route->family = AF_INET;
2ce40956 245 route->gw.in = gateway;
3c9b8860 246
4645ad47 247 route_remove(route, link, NULL);
3c9b8860
TG		 248 }
249 }
250
f414a269
TG		 251 r = sd_dhcp_lease_get_address(link->dhcp_lease, &addr);
252 if (r >= 0) {
253 r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
254 if (r >= 0)
5a941f5f 255 prefixlen = in4_addr_netmask_to_prefixlen(&netmask);
3c9b8860 256
f414a269
TG		 257 address->family = AF_INET;
258 address->in_addr.in = addr;
259 address->prefixlen = prefixlen;
3c9b8860 260
63ae0569 261 address_remove(address, link, NULL);
f414a269 262 }
3c9b8860
TG		 263 }
264
27cb34f5 265 if (link->network->dhcp_use_mtu) {
3c9b8860
TG		 266 uint16_t mtu;
267
268 r = sd_dhcp_lease_get_mtu(link->dhcp_lease, &mtu);
269 if (r >= 0 && link->original_mtu != mtu) {
270 r = link_set_mtu(link, link->original_mtu);
271 if (r < 0) {
79008bdd 272 log_link_warning(link,
3c9b8860
TG		 273 "DHCP error: could not reset MTU");
274 link_enter_failed(link);
275 return r;
276 }
277 }
278 }
279
27cb34f5 280 if (link->network->dhcp_use_hostname) {
3c9b8860
TG		 281 const char *hostname = NULL;
282
27cb34f5
LP		 283 if (link->network->dhcp_hostname)
284 hostname = link->network->dhcp_hostname;
dce391e7
LP		 285 else
286 (void) sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname);
a7d0ef44 287
dce391e7
LP		 288 if (hostname) {
289 /* If a hostname was set due to the lease, then unset it now. */
59eb33e0 290 r = manager_set_hostname(link->manager, NULL);
3c9b8860 291 if (r < 0)
dce391e7 292 log_link_warning_errno(link, r, "Failed to reset transient hostname: %m");
3c9b8860
TG		 293 }
294 }
295
296 link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
6a3e5f6a 297 link_dirty(link);
3c9b8860
TG		 298 link->dhcp4_configured = false;
299
300 return 0;
301}
302
1c4baffc 303static int dhcp4_address_handler(sd_netlink *rtnl, sd_netlink_message *m,
3c9b8860 304 void *userdata) {
1046bf9b 305 Link *link = userdata;
3c9b8860
TG		 306 int r;
307
308 assert(link);
309
1c4baffc 310 r = sd_netlink_message_get_errno(m);
3c9b8860 311 if (r < 0 && r != -EEXIST) {
f6b8196f 312 log_link_error_errno(link, r, "Could not set DHCPv4 address: %m");
3c9b8860 313 link_enter_failed(link);
45af44d4 314 } else if (r >= 0)
200a0868 315 manager_rtnl_process_address(rtnl, m, link->manager);
3c9b8860
TG		 316
317 link_set_dhcp_routes(link);
318
223932c7
AH		 319 if (link->dhcp4_messages == 0) {
320 link->dhcp4_configured = true;
321 link_check_ready(link);
322 }
323
3c9b8860
TG		 324 return 1;
325}
326
327static int dhcp4_update_address(Link *link,
328 struct in_addr *address,
329 struct in_addr *netmask,
330 uint32_t lifetime) {
8e766630 331 _cleanup_(address_freep) Address *addr = NULL;
3c9b8860
TG		 332 unsigned prefixlen;
333 int r;
334
335 assert(address);
336 assert(netmask);
337 assert(lifetime);
338
5a941f5f 339 prefixlen = in4_addr_netmask_to_prefixlen(netmask);
3c9b8860 340
f0213e37 341 r = address_new(&addr);
3c9b8860
TG		 342 if (r < 0)
343 return r;
344
345 addr->family = AF_INET;
346 addr->in_addr.in.s_addr = address->s_addr;
347 addr->cinfo.ifa_prefered = lifetime;
348 addr->cinfo.ifa_valid = lifetime;
349 addr->prefixlen = prefixlen;
350 addr->broadcast.s_addr = address->s_addr | ~netmask->s_addr;
351
66669078
TG		 352 /* allow reusing an existing address and simply update its lifetime
353 * in case it already exists */
483d099e 354 r = address_configure(addr, link, dhcp4_address_handler, true);
3c9b8860
TG		 355 if (r < 0)
356 return r;
357
358 return 0;
359}
360
361static int dhcp_lease_renew(sd_dhcp_client *client, Link *link) {
362 sd_dhcp_lease *lease;
363 struct in_addr address;
364 struct in_addr netmask;
365 uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
366 int r;
367
368 assert(link);
369 assert(client);
370 assert(link->network);
371
372 r = sd_dhcp_client_get_lease(client, &lease);
f6b8196f
LP		 373 if (r < 0)
374 return log_link_warning_errno(link, r, "DHCP error: no lease: %m");
3c9b8860
TG		 375
376 sd_dhcp_lease_unref(link->dhcp_lease);
377 link->dhcp4_configured = false;
e6b18ffa 378 link->dhcp_lease = sd_dhcp_lease_ref(lease);
6a3e5f6a 379 link_dirty(link);
3c9b8860
TG		 380
381 r = sd_dhcp_lease_get_address(lease, &address);
f6b8196f
LP		 382 if (r < 0)
383 return log_link_warning_errno(link, r, "DHCP error: no address: %m");
3c9b8860
TG		 384
385 r = sd_dhcp_lease_get_netmask(lease, &netmask);
f6b8196f
LP		 386 if (r < 0)
387 return log_link_warning_errno(link, r, "DHCP error: no netmask: %m");
3c9b8860
TG		 388
389 if (!link->network->dhcp_critical) {
f6b8196f
LP		 390 r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, &lifetime);
391 if (r < 0)
392 return log_link_warning_errno(link, r, "DHCP error: no lifetime: %m");
3c9b8860
TG		 393 }
394
395 r = dhcp4_update_address(link, &address, &netmask, lifetime);
396 if (r < 0) {
f6b8196f 397 log_link_warning_errno(link, r, "Could not update IP address: %m");
3c9b8860
TG		 398 link_enter_failed(link);
399 return r;
400 }
401
402 return 0;
403}
404
405static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) {
406 sd_dhcp_lease *lease;
407 struct in_addr address;
408 struct in_addr netmask;
409 struct in_addr gateway;
410 unsigned prefixlen;
411 uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
412 int r;
413
414 assert(client);
415 assert(link);
416
417 r = sd_dhcp_client_get_lease(client, &lease);
f2341e0a 418 if (r < 0)
f6b8196f 419 return log_link_error_errno(link, r, "DHCP error: No lease: %m");
3c9b8860
TG		 420
421 r = sd_dhcp_lease_get_address(lease, &address);
f2341e0a 422 if (r < 0)
f6b8196f 423 return log_link_error_errno(link, r, "DHCP error: No address: %m");
3c9b8860
TG		 424
425 r = sd_dhcp_lease_get_netmask(lease, &netmask);
f2341e0a 426 if (r < 0)
f6b8196f 427 return log_link_error_errno(link, r, "DHCP error: No netmask: %m");
3c9b8860 428
5a941f5f 429 prefixlen = in4_addr_netmask_to_prefixlen(&netmask);
3c9b8860
TG		 430
431 r = sd_dhcp_lease_get_router(lease, &gateway);
397d15fd 432 if (r < 0 && r != -ENODATA)
f6b8196f 433 return log_link_error_errno(link, r, "DHCP error: Could not get gateway: %m");
3c9b8860
TG		 434
435 if (r >= 0)
f2341e0a
LP		 436 log_struct(LOG_INFO,
437 LOG_LINK_INTERFACE(link),
438 LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u",
439 ADDRESS_FMT_VAL(address),
440 prefixlen,
441 ADDRESS_FMT_VAL(gateway)),
442 "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address),
443 "PREFIXLEN=%u", prefixlen,
a1230ff9 444 "GATEWAY=%u.%u.%u.%u", ADDRESS_FMT_VAL(gateway));
3c9b8860 445 else
f2341e0a
LP		 446 log_struct(LOG_INFO,
447 LOG_LINK_INTERFACE(link),
448 LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u",
449 ADDRESS_FMT_VAL(address),
450 prefixlen),
451 "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address),
a1230ff9 452 "PREFIXLEN=%u", prefixlen);
3c9b8860 453
e6b18ffa 454 link->dhcp_lease = sd_dhcp_lease_ref(lease);
6a3e5f6a 455 link_dirty(link);
3c9b8860 456
27cb34f5 457 if (link->network->dhcp_use_mtu) {
3c9b8860
TG		 458 uint16_t mtu;
459
460 r = sd_dhcp_lease_get_mtu(lease, &mtu);
461 if (r >= 0) {
462 r = link_set_mtu(link, mtu);
463 if (r < 0)
f2341e0a 464 log_link_error_errno(link, r, "Failed to set MTU to %" PRIu16 ": %m", mtu);
3c9b8860
TG		 465 }
466 }
467
27cb34f5 468 if (link->network->dhcp_use_hostname) {
2de2abad
LB		 469 const char *dhcpname = NULL;
470 _cleanup_free_ char *hostname = NULL;
3c9b8860 471
27cb34f5 472 if (link->network->dhcp_hostname)
2de2abad 473 dhcpname = link->network->dhcp_hostname;
dce391e7 474 else
2de2abad
LB		 475 (void) sd_dhcp_lease_get_hostname(lease, &dhcpname);
476
477 if (dhcpname) {
478 r = shorten_overlong(dhcpname, &hostname);
479 if (r < 0)
480 log_link_warning_errno(link, r, "Unable to shorten overlong DHCP hostname '%s', ignoring: %m", dhcpname);
481 if (r == 1)
482 log_link_notice(link, "Overlong DCHP hostname received, shortened from '%s' to '%s'", dhcpname, hostname);
483 }
a7d0ef44 484
dce391e7 485 if (hostname) {
59eb33e0 486 r = manager_set_hostname(link->manager, hostname);
3c9b8860 487 if (r < 0)
f2341e0a 488 log_link_error_errno(link, r, "Failed to set transient hostname to '%s': %m", hostname);
3c9b8860
TG		 489 }
490 }
491
27cb34f5 492 if (link->network->dhcp_use_timezone) {
21b80ad1
LP		 493 const char *tz = NULL;
494
495 (void) sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
496
497 if (tz) {
59eb33e0 498 r = manager_set_timezone(link->manager, tz);
21b80ad1
LP		 499 if (r < 0)
500 log_link_error_errno(link, r, "Failed to set timezone to '%s': %m", tz);
501 }
502 }
503
3c9b8860 504 if (!link->network->dhcp_critical) {
f2341e0a 505 r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, &lifetime);
fc95c359
YW		 506 if (r < 0)
507 return log_link_warning_errno(link, r, "DHCP error: no lifetime: %m");
3c9b8860
TG		 508 }
509
510 r = dhcp4_update_address(link, &address, &netmask, lifetime);
511 if (r < 0) {
f2341e0a 512 log_link_warning_errno(link, r, "Could not update IP address: %m");
3c9b8860
TG		 513 link_enter_failed(link);
514 return r;
515 }
516
517 return 0;
518}
519static void dhcp4_handler(sd_dhcp_client *client, int event, void *userdata) {
520 Link *link = userdata;
521 int r = 0;
522
523 assert(link);
524 assert(link->network);
525 assert(link->manager);
526
527 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
528 return;
529
530 switch (event) {
03748142
DH		 531 case SD_DHCP_CLIENT_EVENT_EXPIRED:
532 case SD_DHCP_CLIENT_EVENT_STOP:
533 case SD_DHCP_CLIENT_EVENT_IP_CHANGE:
3c9b8860 534 if (link->network->dhcp_critical) {
f6b8196f 535 log_link_error(link, "DHCPv4 connection considered system critical, ignoring request to reconfigure it.");
3c9b8860
TG		 536 return;
537 }
538
539 if (link->dhcp_lease) {
540 r = dhcp_lease_lost(link);
541 if (r < 0) {
542 link_enter_failed(link);
543 return;
544 }
545 }
546
03748142 547 if (event == SD_DHCP_CLIENT_EVENT_IP_CHANGE) {
3c9b8860
TG		 548 r = dhcp_lease_acquired(client, link);
549 if (r < 0) {
550 link_enter_failed(link);
551 return;
552 }
553 }
554
555 break;
03748142 556 case SD_DHCP_CLIENT_EVENT_RENEW:
3c9b8860
TG		 557 r = dhcp_lease_renew(client, link);
558 if (r < 0) {
559 link_enter_failed(link);
560 return;
561 }
562 break;
03748142 563 case SD_DHCP_CLIENT_EVENT_IP_ACQUIRE:
3c9b8860
TG		 564 r = dhcp_lease_acquired(client, link);
565 if (r < 0) {
566 link_enter_failed(link);
567 return;
568 }
569 break;
570 default:
571 if (event < 0)
f6b8196f 572 log_link_warning_errno(link, event, "DHCP error: Client failed: %m");
3c9b8860 573 else
f6b8196f 574 log_link_warning(link, "DHCP unknown event: %i", event);
3c9b8860
TG		 575 break;
576 }
577
578 return;
579}
580
7192bb81
LP		 581static int dhcp4_set_hostname(Link *link) {
582 _cleanup_free_ char *hostname = NULL;
583 const char *hn;
584 int r;
585
586 assert(link);
587
588 if (!link->network->dhcp_send_hostname)
589 hn = NULL;
590 else if (link->network->dhcp_hostname)
591 hn = link->network->dhcp_hostname;
592 else {
593 r = gethostname_strict(&hostname);
594 if (r < 0 && r != -ENXIO) /* ENXIO: no hostname set or hostname is "localhost" */
595 return r;
596
597 hn = hostname;
598 }
599
a8494759
YW		 600 r = sd_dhcp_client_set_hostname(link->dhcp_client, hn);
601 if (r == -EINVAL && hostname)
602 /* Ignore error when the machine's hostname is not suitable to send in DHCP packet. */
603 log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set hostname from kernel hostname, ignoring: %m");
604 else if (r < 0)
605 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set hostname: %m");
606
607 return 0;
7192bb81
LP		 608}
609
64b21ece 610static bool promote_secondaries_enabled(const char *ifname) {
3f550c31
HV		 611 _cleanup_free_ char *promote_secondaries_sysctl = NULL;
612 char *promote_secondaries_path;
64b21ece
MV		 613 int r;
614
615 promote_secondaries_path = strjoina("net/ipv4/conf/", ifname, "/promote_secondaries");
616 r = sysctl_read(promote_secondaries_path, &promote_secondaries_sysctl);
617 if (r < 0) {
618 log_debug_errno(r, "Cannot read sysctl %s", promote_secondaries_path);
619 return false;
620 }
621
622 truncate_nl(promote_secondaries_sysctl);
623 r = parse_boolean(promote_secondaries_sysctl);
624 if (r < 0)
625 log_warning_errno(r, "Cannot parse sysctl %s with content %s as boolean", promote_secondaries_path, promote_secondaries_sysctl);
626 return r > 0;
627}
628
629/* dhcp4_set_promote_secondaries will ensure this interface has
630 * the "promote_secondaries" option in the kernel set. If this sysctl
631 * is not set DHCP will work only as long as the IP address does not
632 * changes between leases. The kernel will remove all secondary IP
633 * addresses of an interface otherwise. The way systemd-network works
634 * is that the new IP of a lease is added as a secondary IP and when
635 * the primary one expires it relies on the kernel to promote the
636 * secondary IP. See also https://github.com/systemd/systemd/issues/7163
637 */
638int dhcp4_set_promote_secondaries(Link *link) {
639 int r;
640
641 assert(link);
642 assert(link->network);
643 assert(link->network->dhcp & ADDRESS_FAMILY_IPV4);
644
645 /* check if the kernel has promote_secondaries enabled for our
646 * interface. If it is not globally enabled or enabled for the
647 * specific interface we must either enable it.
648 */
8e1a7253 649 if (!(promote_secondaries_enabled("all") || promote_secondaries_enabled(link->ifname))) {
64b21ece
MV		 650 char *promote_secondaries_path = NULL;
651
652 log_link_debug(link, "promote_secondaries is unset, setting it");
653 promote_secondaries_path = strjoina("net/ipv4/conf/", link->ifname, "/promote_secondaries");
654 r = sysctl_write(promote_secondaries_path, "1");
655 if (r < 0)
656 log_link_warning_errno(link, r, "cannot set sysctl %s to 1", promote_secondaries_path);
657 return r > 0;
658 }
659
660 return 0;
661}
662
fff1f40c
YW		 663int dhcp4_set_client_identifier(Link *link) {
664 int r;
665
666 assert(link);
667 assert(link->network);
668 assert(link->dhcp_client);
669
670 switch (link->network->dhcp_client_identifier) {
671 case DHCP_CLIENT_ID_DUID: {
0cf7c3fd 672 /* If configured, apply user specified DUID and IAID */
fff1f40c
YW		 673 const DUID *duid = link_get_duid(link);
674
0cf7c3fd
YW		 675 if (duid->type == DUID_TYPE_LLT && duid->raw_data_len == 0)
676 r = sd_dhcp_client_set_iaid_duid_llt(link->dhcp_client,
677 link->network->iaid,
678 duid->llt_time);
679 else
680 r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
681 link->network->iaid,
682 duid->type,
683 duid->raw_data_len > 0 ? duid->raw_data : NULL,
684 duid->raw_data_len);
fff1f40c 685 if (r < 0)
0cf7c3fd 686 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set IAID+DUID: %m");
fff1f40c
YW		 687 break;
688 }
689 case DHCP_CLIENT_ID_DUID_ONLY: {
690 /* If configured, apply user specified DUID */
691 const DUID *duid = link_get_duid(link);
692
0cf7c3fd
YW		 693 if (duid->type == DUID_TYPE_LLT && duid->raw_data_len == 0)
694 r = sd_dhcp_client_set_duid_llt(link->dhcp_client,
695 duid->llt_time);
696 else
697 r = sd_dhcp_client_set_duid(link->dhcp_client,
698 duid->type,
699 duid->raw_data_len > 0 ? duid->raw_data : NULL,
700 duid->raw_data_len);
fff1f40c
YW		 701 if (r < 0)
702 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set DUID: %m");
703 break;
704 }
705 case DHCP_CLIENT_ID_MAC:
706 r = sd_dhcp_client_set_client_id(link->dhcp_client,
707 ARPHRD_ETHER,
708 (const uint8_t *) &link->mac,
709 sizeof(link->mac));
710 if (r < 0)
711 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set client ID: %m");
712 break;
713 default:
714 assert_not_reached("Unknown client identifier type.");
715 }
716
717 return 0;
718}
719
3c9b8860
TG		 720int dhcp4_configure(Link *link) {
721 int r;
722
723 assert(link);
724 assert(link->network);
e0ee46f2 725 assert(link->network->dhcp & ADDRESS_FAMILY_IPV4);
3c9b8860 726
0bc70f1d 727 if (!link->dhcp_client) {
db3d2358 728 r = sd_dhcp_client_new(&link->dhcp_client, link->network->dhcp_anonymize);
1f6860d9
YW		 729 if (r == -ENOMEM)
730 return log_oom();
0bc70f1d 731 if (r < 0)
1f6860d9 732 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to create DHCP4 client: %m");
0bc70f1d 733 }
3c9b8860
TG		 734
735 r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
736 if (r < 0)
1f6860d9 737 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to attach event: %m");
3c9b8860 738
76253e73
DW		 739 r = sd_dhcp_client_set_mac(link->dhcp_client,
740 (const uint8_t *) &link->mac,
741 sizeof (link->mac), ARPHRD_ETHER);
3c9b8860 742 if (r < 0)
1f6860d9 743 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set MAC address: %m");
3c9b8860 744
2f8e7633 745 r = sd_dhcp_client_set_ifindex(link->dhcp_client, link->ifindex);
3c9b8860 746 if (r < 0)
1f6860d9 747 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set ifindex: %m");
3c9b8860
TG		 748
749 r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp4_handler, link);
750 if (r < 0)
1f6860d9 751 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set callback: %m");
3c9b8860
TG		 752
753 r = sd_dhcp_client_set_request_broadcast(link->dhcp_client,
754 link->network->dhcp_broadcast);
755 if (r < 0)
1f6860d9 756 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for broadcast: %m");
3c9b8860
TG		 757
758 if (link->mtu) {
759 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
760 if (r < 0)
1f6860d9 761 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set MTU: %m");
3c9b8860
TG		 762 }
763
27cb34f5 764 if (link->network->dhcp_use_mtu) {
39745a5a 765 r = sd_dhcp_client_set_request_option(link->dhcp_client,
22805d92 766 SD_DHCP_OPTION_INTERFACE_MTU);
39745a5a 767 if (r < 0)
1f6860d9 768 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for MTU: %m");
3c9b8860
TG		 769 }
770
5e77a146 771 /* NOTE: even if this variable is called "use", it also "sends" PRL
772 * options, maybe there should be a different configuration variable
773 * to send or not route options?. */
28522b0d 774 /* NOTE: when using Anonymize=yes, routes PRL options are sent
775 * by default, so they don't need to be added here. */
5e77a146 776 if (link->network->dhcp_use_routes && !link->network->dhcp_anonymize) {
3c9b8860 777 r = sd_dhcp_client_set_request_option(link->dhcp_client,
22805d92 778 SD_DHCP_OPTION_STATIC_ROUTE);
3c9b8860 779 if (r < 0)
1f6860d9
YW		 780 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for static route: %m");
781
3c9b8860 782 r = sd_dhcp_client_set_request_option(link->dhcp_client,
22805d92 783 SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE);
7d6884b6 784 if (r < 0)
1f6860d9 785 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for classless static route: %m");
3c9b8860
TG		 786 }
787
ead36ce6 788 if (link->network->dhcp_use_ntp) {
789 r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NTP_SERVER);
790 if (r < 0)
1f6860d9 791 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for NTP server: %m");
ead36ce6 792 }
4b7b5abb 793
89573b37 794 if (link->network->dhcp_use_timezone) {
795 r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NEW_TZDB_TIMEZONE);
796 if (r < 0)
1f6860d9 797 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for timezone: %m");
89573b37 798 }
8eb9058d 799
7192bb81
LP		 800 r = dhcp4_set_hostname(link);
801 if (r < 0)
a8494759 802 return r;
3c9b8860
TG		 803
804 if (link->network->dhcp_vendor_class_identifier) {
805 r = sd_dhcp_client_set_vendor_class_identifier(link->dhcp_client,
806 link->network->dhcp_vendor_class_identifier);
807 if (r < 0)
1f6860d9 808 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set vendor class identifier: %m");
3c9b8860
TG		 809 }
810
af1c0de0
SS		 811 if (link->network->dhcp_user_class) {
812 r = sd_dhcp_client_set_user_class(link->dhcp_client, (const char **) link->network->dhcp_user_class);
813 if (r < 0)
1f6860d9 814 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set user class: %m");
af1c0de0
SS		 815 }
816
9faed222
SS		 817 if (link->network->dhcp_client_port) {
818 r = sd_dhcp_client_set_client_port(link->dhcp_client, link->network->dhcp_client_port);
819 if (r < 0)
1f6860d9 820 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set listen port: %m");
9faed222
SS		 821 }
822
fff1f40c 823 return dhcp4_set_client_identifier(link);
3c9b8860 824}
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