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network: add more log messages in configuring DHCP4 client
[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
LP		 6#include "alloc-util.h"
7#include "dhcp-lease-internal.h"
958b66ea 8#include "hostname-util.h"
64b21ece 9#include "parse-util.h"
fc1ba79d 10#include "netdev/vrf.h"
3c9b8860 11#include "network-internal.h"
23f53b99
TG		 12#include "networkd-link.h"
13#include "networkd-manager.h"
14#include "networkd-network.h"
64b21ece
MV		 15#include "string-util.h"
16#include "sysctl-util.h"
3c9b8860 17
1c4baffc 18static int dhcp4_route_handler(sd_netlink *rtnl, sd_netlink_message *m,
3c9b8860 19 void *userdata) {
8e766630 20 _cleanup_(link_unrefp) Link *link = userdata;
3c9b8860
TG		 21 int r;
22
23 assert(link);
6cf4a01c 24 assert(link->dhcp4_messages > 0);
3c9b8860 25
313cefa1 26 link->dhcp4_messages--;
3c9b8860 27
1c4baffc 28 r = sd_netlink_message_get_errno(m);
3c9b8860 29 if (r < 0 && r != -EEXIST) {
f6b8196f 30 log_link_error_errno(link, r, "Could not set DHCPv4 route: %m");
3c9b8860
TG		 31 link_enter_failed(link);
32 }
33
6cf4a01c 34 if (link->dhcp4_messages == 0) {
3c9b8860 35 link->dhcp4_configured = true;
8012cd39 36 link_check_ready(link);
3c9b8860
TG		 37 }
38
39 return 1;
40}
41
d6eac9bd
DW		 42static int route_scope_from_address(const Route *route, const struct in_addr *self_addr) {
43 assert(route);
44 assert(self_addr);
45
46 if (in_addr_is_localhost(AF_INET, &route->dst) ||
47 (self_addr->s_addr && route->dst.in.s_addr == self_addr->s_addr))
48 return RT_SCOPE_HOST;
49 else if (in4_addr_is_null(&route->gw.in))
50 return RT_SCOPE_LINK;
51 else
52 return RT_SCOPE_UNIVERSE;
53}
54
3c9b8860 55static int link_set_dhcp_routes(Link *link) {
f8693fc7 56 _cleanup_free_ sd_dhcp_route **static_routes = NULL;
8cdc46e7
SS		 57 bool classless_route = false, static_route = false;
58 struct in_addr gateway, address;
3c9b8860 59 int r, n, i;
fc1ba79d 60 uint32_t table;
3c9b8860
TG		 61
62 assert(link);
0c9b15a3
AJ		 63
64 if (!link->dhcp_lease) /* link went down while we configured the IP addresses? */
65 return 0;
66
67 if (!link->network) /* link went down while we configured the IP addresses? */
68 return 0;
964b26fe
SS		 69
70 if (!link->network->dhcp_use_routes)
71 return 0;
3c9b8860 72
fc1ba79d
AR		 73 /* When the interface is part of an VRF use the VRFs routing table, unless
74 * there is a another table specified. */
75 table = link->network->dhcp_route_table;
76 if (!link->network->dhcp_route_table_set && link->network->vrf != NULL)
77 table = VRF(link->network->vrf)->table;
78
b23aec0d
DW		 79 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
80 if (r < 0)
81 return log_link_warning_errno(link, r, "DHCP error: could not get address: %m");
82
5f04a209 83 n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes);
599c44e6
YW		 84 if (n == -ENODATA)
85 log_link_debug_errno(link, n, "DHCP: No routes received from DHCP server: %m");
86 else if (n < 0)
8dc787d1 87 log_link_debug_errno(link, n, "DHCP error: could not get routes: %m");
5f04a209 88
8cdc46e7
SS		 89 for (i = 0; i < n; i++) {
90 if (static_routes[i]->option == SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE)
91 classless_route = true;
92
93 if (static_routes[i]->option == SD_DHCP_OPTION_STATIC_ROUTE)
94 static_route = true;
95 }
96
5f04a209 97 for (i = 0; i < n; i++) {
8e766630 98 _cleanup_(route_freep) Route *route = NULL;
5f04a209 99
8cdc46e7
SS		 100 /* if the DHCP server returns both a Classless Static Routes option and a Static Routes option,
101 the DHCP client MUST ignore the Static Routes option. */
102 if (classless_route && static_routes[i]->option == SD_DHCP_OPTION_STATIC_ROUTE)
103 continue;
104
5f04a209
SS		 105 r = route_new(&route);
106 if (r < 0)
107 return log_link_error_errno(link, r, "Could not allocate route: %m");
108
109 route->family = AF_INET;
110 route->protocol = RTPROT_DHCP;
111 assert_se(sd_dhcp_route_get_gateway(static_routes[i], &route->gw.in) >= 0);
112 assert_se(sd_dhcp_route_get_destination(static_routes[i], &route->dst.in) >= 0);
113 assert_se(sd_dhcp_route_get_destination_prefix_length(static_routes[i], &route->dst_prefixlen) >= 0);
114 route->priority = link->network->dhcp_route_metric;
115 route->table = table;
116 route->scope = route_scope_from_address(route, &address);
117
118 r = route_configure(route, link, dhcp4_route_handler);
119 if (r < 0)
120 return log_link_warning_errno(link, r, "Could not set host route: %m");
121
122 link->dhcp4_messages++;
123 }
124
3c9b8860 125 r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
444b0170 126 if (r == -ENODATA)
fb14aa7e 127 log_link_info_errno(link, r, "DHCP: No gateway received from DHCP server: %m");
444b0170
SS		 128 else if (r < 0)
129 log_link_warning_errno(link, r, "DHCP error: could not get gateway: %m");
f6b8196f 130
5f04a209
SS		 131 /* According to RFC 3442: If the DHCP server returns both a Classless Static Routes option and
132 a Router option, the DHCP client MUST ignore the Router option. */
8cdc46e7
SS		 133 if (classless_route && static_route)
134 log_link_warning(link, "Classless static routes received from DHCP server: ignoring static-route option and router option");
135
136 if (r >= 0 && !classless_route) {
8e766630
LP		 137 _cleanup_(route_freep) Route *route = NULL;
138 _cleanup_(route_freep) Route *route_gw = NULL;
3c9b8860 139
ed9e361a 140 r = route_new(&route);
f6b8196f
LP		 141 if (r < 0)
142 return log_link_error_errno(link, r, "Could not allocate route: %m");
3c9b8860 143
ed9e361a
TG		 144 route->protocol = RTPROT_DHCP;
145
146 r = route_new(&route_gw);
f6b8196f
LP		 147 if (r < 0)
148 return log_link_error_errno(link, r, "Could not allocate route: %m");
3c9b8860
TG		 149
150 /* The dhcp netmask may mask out the gateway. Add an explicit
151 * route for the gw host so that we can route no matter the
152 * netmask or existing kernel route tables. */
153 route_gw->family = AF_INET;
2ce40956 154 route_gw->dst.in = gateway;
3c9b8860 155 route_gw->dst_prefixlen = 32;
2ce40956 156 route_gw->prefsrc.in = address;
3c9b8860 157 route_gw->scope = RT_SCOPE_LINK;
ed9e361a 158 route_gw->protocol = RTPROT_DHCP;
86655331 159 route_gw->priority = link->network->dhcp_route_metric;
fc1ba79d 160 route_gw->table = table;
3c9b8860 161
483d099e 162 r = route_configure(route_gw, link, dhcp4_route_handler);
f6b8196f
LP		 163 if (r < 0)
164 return log_link_warning_errno(link, r, "Could not set host route: %m");
3c9b8860 165
313cefa1 166 link->dhcp4_messages++;
3c9b8860
TG		 167
168 route->family = AF_INET;
2ce40956
TG		 169 route->gw.in = gateway;
170 route->prefsrc.in = address;
86655331 171 route->priority = link->network->dhcp_route_metric;
fc1ba79d 172 route->table = table;
3c9b8860 173
483d099e 174 r = route_configure(route, link, dhcp4_route_handler);
3c9b8860 175 if (r < 0) {
f6b8196f 176 log_link_warning_errno(link, r, "Could not set routes: %m");
3c9b8860
TG		 177 link_enter_failed(link);
178 return r;
179 }
180
313cefa1 181 link->dhcp4_messages++;
3c9b8860
TG		 182 }
183
3c9b8860
TG		 184 return 0;
185}
186
187static int dhcp_lease_lost(Link *link) {
8e766630 188 _cleanup_(address_freep) Address *address = NULL;
3c9b8860
TG		 189 struct in_addr addr;
190 struct in_addr netmask;
191 struct in_addr gateway;
f414a269 192 unsigned prefixlen = 0;
3c9b8860
TG		 193 int r;
194
195 assert(link);
196 assert(link->dhcp_lease);
197
79008bdd 198 log_link_warning(link, "DHCP lease lost");
3c9b8860 199
27cb34f5 200 if (link->network->dhcp_use_routes) {
f8693fc7 201 _cleanup_free_ sd_dhcp_route **routes = NULL;
3c9b8860
TG		 202 int n, i;
203
204 n = sd_dhcp_lease_get_routes(link->dhcp_lease, &routes);
205 if (n >= 0) {
206 for (i = 0; i < n; i++) {
8e766630 207 _cleanup_(route_freep) Route *route = NULL;
3c9b8860 208
ed9e361a 209 r = route_new(&route);
3c9b8860
TG		 210 if (r >= 0) {
211 route->family = AF_INET;
f8693fc7
BG		 212 assert_se(sd_dhcp_route_get_gateway(routes[i], &route->gw.in) >= 0);
213 assert_se(sd_dhcp_route_get_destination(routes[i], &route->dst.in) >= 0);
214 assert_se(sd_dhcp_route_get_destination_prefix_length(routes[i], &route->dst_prefixlen) >= 0);
3c9b8860 215
91b5f997 216 route_remove(route, link,
483d099e 217 link_route_remove_handler);
3c9b8860
TG		 218 }
219 }
220 }
221 }
222
f0213e37 223 r = address_new(&address);
3c9b8860
TG		 224 if (r >= 0) {
225 r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
226 if (r >= 0) {
8e766630
LP		 227 _cleanup_(route_freep) Route *route_gw = NULL;
228 _cleanup_(route_freep) Route *route = NULL;
3c9b8860 229
ed9e361a 230 r = route_new(&route_gw);
3c9b8860
TG		 231 if (r >= 0) {
232 route_gw->family = AF_INET;
2ce40956 233 route_gw->dst.in = gateway;
3c9b8860
TG		 234 route_gw->dst_prefixlen = 32;
235 route_gw->scope = RT_SCOPE_LINK;
236
91b5f997 237 route_remove(route_gw, link,
483d099e 238 link_route_remove_handler);
3c9b8860
TG		 239 }
240
ed9e361a 241 r = route_new(&route);
3c9b8860
TG		 242 if (r >= 0) {
243 route->family = AF_INET;
2ce40956 244 route->gw.in = gateway;
3c9b8860 245
91b5f997 246 route_remove(route, link,
483d099e 247 link_route_remove_handler);
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
483d099e 261 address_remove(address, link, link_address_remove_handler);
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) {
8e766630 305 _cleanup_(link_unrefp) 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);
3c9b8860 506 if (r < 0) {
f2341e0a 507 log_link_warning_errno(link, r, "DHCP error: no lifetime: %m");
3c9b8860
TG		 508 return r;
509 }
510 }
511
512 r = dhcp4_update_address(link, &address, &netmask, lifetime);
513 if (r < 0) {
f2341e0a 514 log_link_warning_errno(link, r, "Could not update IP address: %m");
3c9b8860
TG		 515 link_enter_failed(link);
516 return r;
517 }
518
519 return 0;
520}
521static void dhcp4_handler(sd_dhcp_client *client, int event, void *userdata) {
522 Link *link = userdata;
523 int r = 0;
524
525 assert(link);
526 assert(link->network);
527 assert(link->manager);
528
529 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
530 return;
531
532 switch (event) {
03748142
DH		 533 case SD_DHCP_CLIENT_EVENT_EXPIRED:
534 case SD_DHCP_CLIENT_EVENT_STOP:
535 case SD_DHCP_CLIENT_EVENT_IP_CHANGE:
3c9b8860 536 if (link->network->dhcp_critical) {
f6b8196f 537 log_link_error(link, "DHCPv4 connection considered system critical, ignoring request to reconfigure it.");
3c9b8860
TG		 538 return;
539 }
540
541 if (link->dhcp_lease) {
542 r = dhcp_lease_lost(link);
543 if (r < 0) {
544 link_enter_failed(link);
545 return;
546 }
547 }
548
03748142 549 if (event == SD_DHCP_CLIENT_EVENT_IP_CHANGE) {
3c9b8860
TG		 550 r = dhcp_lease_acquired(client, link);
551 if (r < 0) {
552 link_enter_failed(link);
553 return;
554 }
555 }
556
557 break;
03748142 558 case SD_DHCP_CLIENT_EVENT_RENEW:
3c9b8860
TG		 559 r = dhcp_lease_renew(client, link);
560 if (r < 0) {
561 link_enter_failed(link);
562 return;
563 }
564 break;
03748142 565 case SD_DHCP_CLIENT_EVENT_IP_ACQUIRE:
3c9b8860
TG		 566 r = dhcp_lease_acquired(client, link);
567 if (r < 0) {
568 link_enter_failed(link);
569 return;
570 }
571 break;
572 default:
573 if (event < 0)
f6b8196f 574 log_link_warning_errno(link, event, "DHCP error: Client failed: %m");
3c9b8860 575 else
f6b8196f 576 log_link_warning(link, "DHCP unknown event: %i", event);
3c9b8860
TG		 577 break;
578 }
579
580 return;
581}
582
7192bb81
LP		 583static int dhcp4_set_hostname(Link *link) {
584 _cleanup_free_ char *hostname = NULL;
585 const char *hn;
586 int r;
587
588 assert(link);
589
590 if (!link->network->dhcp_send_hostname)
591 hn = NULL;
592 else if (link->network->dhcp_hostname)
593 hn = link->network->dhcp_hostname;
594 else {
595 r = gethostname_strict(&hostname);
596 if (r < 0 && r != -ENXIO) /* ENXIO: no hostname set or hostname is "localhost" */
597 return r;
598
599 hn = hostname;
600 }
601
602 return sd_dhcp_client_set_hostname(link->dhcp_client, hn);
603}
604
64b21ece 605static bool promote_secondaries_enabled(const char *ifname) {
3f550c31
HV		 606 _cleanup_free_ char *promote_secondaries_sysctl = NULL;
607 char *promote_secondaries_path;
64b21ece
MV		 608 int r;
609
610 promote_secondaries_path = strjoina("net/ipv4/conf/", ifname, "/promote_secondaries");
611 r = sysctl_read(promote_secondaries_path, &promote_secondaries_sysctl);
612 if (r < 0) {
613 log_debug_errno(r, "Cannot read sysctl %s", promote_secondaries_path);
614 return false;
615 }
616
617 truncate_nl(promote_secondaries_sysctl);
618 r = parse_boolean(promote_secondaries_sysctl);
619 if (r < 0)
620 log_warning_errno(r, "Cannot parse sysctl %s with content %s as boolean", promote_secondaries_path, promote_secondaries_sysctl);
621 return r > 0;
622}
623
624/* dhcp4_set_promote_secondaries will ensure this interface has
625 * the "promote_secondaries" option in the kernel set. If this sysctl
626 * is not set DHCP will work only as long as the IP address does not
627 * changes between leases. The kernel will remove all secondary IP
628 * addresses of an interface otherwise. The way systemd-network works
629 * is that the new IP of a lease is added as a secondary IP and when
630 * the primary one expires it relies on the kernel to promote the
631 * secondary IP. See also https://github.com/systemd/systemd/issues/7163
632 */
633int dhcp4_set_promote_secondaries(Link *link) {
634 int r;
635
636 assert(link);
637 assert(link->network);
638 assert(link->network->dhcp & ADDRESS_FAMILY_IPV4);
639
640 /* check if the kernel has promote_secondaries enabled for our
641 * interface. If it is not globally enabled or enabled for the
642 * specific interface we must either enable it.
643 */
8e1a7253 644 if (!(promote_secondaries_enabled("all") || promote_secondaries_enabled(link->ifname))) {
64b21ece
MV		 645 char *promote_secondaries_path = NULL;
646
647 log_link_debug(link, "promote_secondaries is unset, setting it");
648 promote_secondaries_path = strjoina("net/ipv4/conf/", link->ifname, "/promote_secondaries");
649 r = sysctl_write(promote_secondaries_path, "1");
650 if (r < 0)
651 log_link_warning_errno(link, r, "cannot set sysctl %s to 1", promote_secondaries_path);
652 return r > 0;
653 }
654
655 return 0;
656}
657
3c9b8860
TG		 658int dhcp4_configure(Link *link) {
659 int r;
660
661 assert(link);
662 assert(link->network);
e0ee46f2 663 assert(link->network->dhcp & ADDRESS_FAMILY_IPV4);
3c9b8860 664
0bc70f1d 665 if (!link->dhcp_client) {
db3d2358 666 r = sd_dhcp_client_new(&link->dhcp_client, link->network->dhcp_anonymize);
1f6860d9
YW		 667 if (r == -ENOMEM)
668 return log_oom();
0bc70f1d 669 if (r < 0)
1f6860d9 670 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to create DHCP4 client: %m");
0bc70f1d 671 }
3c9b8860
TG		 672
673 r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
674 if (r < 0)
1f6860d9 675 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to attach event: %m");
3c9b8860 676
76253e73
DW		 677 r = sd_dhcp_client_set_mac(link->dhcp_client,
678 (const uint8_t *) &link->mac,
679 sizeof (link->mac), ARPHRD_ETHER);
3c9b8860 680 if (r < 0)
1f6860d9 681 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set MAC address: %m");
3c9b8860 682
2f8e7633 683 r = sd_dhcp_client_set_ifindex(link->dhcp_client, link->ifindex);
3c9b8860 684 if (r < 0)
1f6860d9 685 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set ifindex: %m");
3c9b8860
TG		 686
687 r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp4_handler, link);
688 if (r < 0)
1f6860d9 689 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set callback: %m");
3c9b8860
TG		 690
691 r = sd_dhcp_client_set_request_broadcast(link->dhcp_client,
692 link->network->dhcp_broadcast);
693 if (r < 0)
1f6860d9 694 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for broadcast: %m");
3c9b8860
TG		 695
696 if (link->mtu) {
697 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
698 if (r < 0)
1f6860d9 699 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set MTU: %m");
3c9b8860
TG		 700 }
701
27cb34f5 702 if (link->network->dhcp_use_mtu) {
39745a5a 703 r = sd_dhcp_client_set_request_option(link->dhcp_client,
22805d92 704 SD_DHCP_OPTION_INTERFACE_MTU);
39745a5a 705 if (r < 0)
1f6860d9 706 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for MTU: %m");
3c9b8860
TG		 707 }
708
5e77a146 709 /* NOTE: even if this variable is called "use", it also "sends" PRL
710 * options, maybe there should be a different configuration variable
711 * to send or not route options?. */
28522b0d 712 /* NOTE: when using Anonymize=yes, routes PRL options are sent
713 * by default, so they don't need to be added here. */
5e77a146 714 if (link->network->dhcp_use_routes && !link->network->dhcp_anonymize) {
3c9b8860 715 r = sd_dhcp_client_set_request_option(link->dhcp_client,
22805d92 716 SD_DHCP_OPTION_STATIC_ROUTE);
3c9b8860 717 if (r < 0)
1f6860d9
YW		 718 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for static route: %m");
719
3c9b8860 720 r = sd_dhcp_client_set_request_option(link->dhcp_client,
22805d92 721 SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE);
7d6884b6 722 if (r < 0)
1f6860d9 723 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for classless static route: %m");
3c9b8860
TG		 724 }
725
ead36ce6 726 if (link->network->dhcp_use_ntp) {
727 r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NTP_SERVER);
728 if (r < 0)
1f6860d9 729 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for NTP server: %m");
ead36ce6 730 }
4b7b5abb 731
89573b37 732 if (link->network->dhcp_use_timezone) {
733 r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NEW_TZDB_TIMEZONE);
734 if (r < 0)
1f6860d9 735 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for timezone: %m");
89573b37 736 }
8eb9058d 737
7192bb81
LP		 738 r = dhcp4_set_hostname(link);
739 if (r < 0)
1f6860d9 740 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set hostname: %m");
3c9b8860
TG		 741
742 if (link->network->dhcp_vendor_class_identifier) {
743 r = sd_dhcp_client_set_vendor_class_identifier(link->dhcp_client,
744 link->network->dhcp_vendor_class_identifier);
745 if (r < 0)
1f6860d9 746 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set vendor class identifier: %m");
3c9b8860
TG		 747 }
748
af1c0de0
SS		 749 if (link->network->dhcp_user_class) {
750 r = sd_dhcp_client_set_user_class(link->dhcp_client, (const char **) link->network->dhcp_user_class);
751 if (r < 0)
1f6860d9 752 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set user class: %m");
af1c0de0
SS		 753 }
754
9faed222
SS		 755 if (link->network->dhcp_client_port) {
756 r = sd_dhcp_client_set_client_port(link->dhcp_client, link->network->dhcp_client_port);
757 if (r < 0)
1f6860d9 758 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set listen port: %m");
9faed222
SS		 759 }
760
3e43b2cd 761 switch (link->network->dhcp_client_identifier) {
8341a5c3 762 case DHCP_CLIENT_ID_DUID: {
413708d1 763 /* If configured, apply user specified DUID and/or IAID */
8341a5c3
ZJS		 764 const DUID *duid = link_duid(link);
765
766 r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
767 link->network->iaid,
768 duid->type,
769 duid->raw_data_len > 0 ? duid->raw_data : NULL,
770 duid->raw_data_len);
413708d1 771 if (r < 0)
1f6860d9 772 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set DUID: %m");
3e43b2cd 773 break;
8341a5c3 774 }
dace710c
YW		 775 case DHCP_CLIENT_ID_DUID_ONLY: {
776 /* If configured, apply user specified DUID */
777 const DUID *duid = link_duid(link);
778
779 r = sd_dhcp_client_set_duid(link->dhcp_client,
780 duid->type,
781 duid->raw_data_len > 0 ? duid->raw_data : NULL,
782 duid->raw_data_len);
783 if (r < 0)
1f6860d9 784 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set DUID: %m");
dace710c
YW		 785 break;
786 }
3e43b2cd
JJ		 787 case DHCP_CLIENT_ID_MAC:
788 r = sd_dhcp_client_set_client_id(link->dhcp_client,
789 ARPHRD_ETHER,
790 (const uint8_t *) &link->mac,
8341a5c3 791 sizeof(link->mac));
3e43b2cd 792 if (r < 0)
1f6860d9 793 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set client ID: %m");
3e43b2cd
JJ		 794 break;
795 default:
796 assert_not_reached("Unknown client identifier type.");
797 }
798
3c9b8860
TG		 799 return 0;
800}
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