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basic/log: add the log_struct terminator to macro
[thirdparty/systemd.git] / src / network / networkd-dhcp4.c
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53e1b683 1/* SPDX-License-Identifier: LGPL-2.1+ */
3c9b8860
TG		 2/***
3 This file is part of systemd.
4
5 Copyright 2013-2014 Tom Gundersen <teg@jklm.no>
3c9b8860
TG		 6***/
7
8#include <netinet/ether.h>
9#include <linux/if.h>
10
b5efdb8a
LP		 11#include "alloc-util.h"
12#include "dhcp-lease-internal.h"
958b66ea 13#include "hostname-util.h"
64b21ece 14#include "parse-util.h"
fc1ba79d 15#include "netdev/vrf.h"
3c9b8860 16#include "network-internal.h"
23f53b99
TG		 17#include "networkd-link.h"
18#include "networkd-manager.h"
19#include "networkd-network.h"
64b21ece
MV		 20#include "string-util.h"
21#include "sysctl-util.h"
3c9b8860 22
1c4baffc 23static int dhcp4_route_handler(sd_netlink *rtnl, sd_netlink_message *m,
3c9b8860 24 void *userdata) {
8e766630 25 _cleanup_(link_unrefp) Link *link = userdata;
3c9b8860
TG		 26 int r;
27
28 assert(link);
6cf4a01c 29 assert(link->dhcp4_messages > 0);
3c9b8860 30
313cefa1 31 link->dhcp4_messages--;
3c9b8860 32
1c4baffc 33 r = sd_netlink_message_get_errno(m);
3c9b8860 34 if (r < 0 && r != -EEXIST) {
f6b8196f 35 log_link_error_errno(link, r, "Could not set DHCPv4 route: %m");
3c9b8860
TG		 36 link_enter_failed(link);
37 }
38
6cf4a01c 39 if (link->dhcp4_messages == 0) {
3c9b8860 40 link->dhcp4_configured = true;
8012cd39 41 link_check_ready(link);
3c9b8860
TG		 42 }
43
44 return 1;
45}
46
d6eac9bd
DW		 47static int route_scope_from_address(const Route *route, const struct in_addr *self_addr) {
48 assert(route);
49 assert(self_addr);
50
51 if (in_addr_is_localhost(AF_INET, &route->dst) ||
52 (self_addr->s_addr && route->dst.in.s_addr == self_addr->s_addr))
53 return RT_SCOPE_HOST;
54 else if (in4_addr_is_null(&route->gw.in))
55 return RT_SCOPE_LINK;
56 else
57 return RT_SCOPE_UNIVERSE;
58}
59
3c9b8860 60static int link_set_dhcp_routes(Link *link) {
f8693fc7 61 _cleanup_free_ sd_dhcp_route **static_routes = NULL;
8cdc46e7
SS		 62 bool classless_route = false, static_route = false;
63 struct in_addr gateway, address;
3c9b8860 64 int r, n, i;
fc1ba79d 65 uint32_t table;
3c9b8860
TG		 66
67 assert(link);
0c9b15a3
AJ		 68
69 if (!link->dhcp_lease) /* link went down while we configured the IP addresses? */
70 return 0;
71
72 if (!link->network) /* link went down while we configured the IP addresses? */
73 return 0;
964b26fe
SS		 74
75 if (!link->network->dhcp_use_routes)
76 return 0;
3c9b8860 77
fc1ba79d
AR		 78 /* When the interface is part of an VRF use the VRFs routing table, unless
79 * there is a another table specified. */
80 table = link->network->dhcp_route_table;
81 if (!link->network->dhcp_route_table_set && link->network->vrf != NULL)
82 table = VRF(link->network->vrf)->table;
83
b23aec0d
DW		 84 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
85 if (r < 0)
86 return log_link_warning_errno(link, r, "DHCP error: could not get address: %m");
87
5f04a209 88 n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes);
5f04a209 89 if (n < 0)
8dc787d1 90 log_link_debug_errno(link, n, "DHCP error: could not get routes: %m");
5f04a209 91
8cdc46e7
SS		 92 for (i = 0; i < n; i++) {
93 if (static_routes[i]->option == SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE)
94 classless_route = true;
95
96 if (static_routes[i]->option == SD_DHCP_OPTION_STATIC_ROUTE)
97 static_route = true;
98 }
99
5f04a209 100 for (i = 0; i < n; i++) {
8e766630 101 _cleanup_(route_freep) Route *route = NULL;
5f04a209 102
8cdc46e7
SS		 103 /* if the DHCP server returns both a Classless Static Routes option and a Static Routes option,
104 the DHCP client MUST ignore the Static Routes option. */
105 if (classless_route && static_routes[i]->option == SD_DHCP_OPTION_STATIC_ROUTE)
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
SS		 129 if (r == -ENODATA)
130 log_link_info_errno(link, r, "DHCP: No routes received from DHCP server: %m");
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
91b5f997 219 route_remove(route, link,
483d099e 220 link_route_remove_handler);
3c9b8860
TG		 221 }
222 }
223 }
224 }
225
f0213e37 226 r = address_new(&address);
3c9b8860
TG		 227 if (r >= 0) {
228 r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
229 if (r >= 0) {
8e766630
LP		 230 _cleanup_(route_freep) Route *route_gw = NULL;
231 _cleanup_(route_freep) Route *route = NULL;
3c9b8860 232
ed9e361a 233 r = route_new(&route_gw);
3c9b8860
TG		 234 if (r >= 0) {
235 route_gw->family = AF_INET;
2ce40956 236 route_gw->dst.in = gateway;
3c9b8860
TG		 237 route_gw->dst_prefixlen = 32;
238 route_gw->scope = RT_SCOPE_LINK;
239
91b5f997 240 route_remove(route_gw, link,
483d099e 241 link_route_remove_handler);
3c9b8860
TG		 242 }
243
ed9e361a 244 r = route_new(&route);
3c9b8860
TG		 245 if (r >= 0) {
246 route->family = AF_INET;
2ce40956 247 route->gw.in = gateway;
3c9b8860 248
91b5f997 249 route_remove(route, link,
483d099e 250 link_route_remove_handler);
3c9b8860
TG		 251 }
252 }
253
f414a269
TG		 254 r = sd_dhcp_lease_get_address(link->dhcp_lease, &addr);
255 if (r >= 0) {
256 r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
257 if (r >= 0)
5a941f5f 258 prefixlen = in4_addr_netmask_to_prefixlen(&netmask);
3c9b8860 259
f414a269
TG		 260 address->family = AF_INET;
261 address->in_addr.in = addr;
262 address->prefixlen = prefixlen;
3c9b8860 263
483d099e 264 address_remove(address, link, link_address_remove_handler);
f414a269 265 }
3c9b8860
TG		 266 }
267
27cb34f5 268 if (link->network->dhcp_use_mtu) {
3c9b8860
TG		 269 uint16_t mtu;
270
271 r = sd_dhcp_lease_get_mtu(link->dhcp_lease, &mtu);
272 if (r >= 0 && link->original_mtu != mtu) {
273 r = link_set_mtu(link, link->original_mtu);
274 if (r < 0) {
79008bdd 275 log_link_warning(link,
3c9b8860
TG		 276 "DHCP error: could not reset MTU");
277 link_enter_failed(link);
278 return r;
279 }
280 }
281 }
282
27cb34f5 283 if (link->network->dhcp_use_hostname) {
3c9b8860
TG		 284 const char *hostname = NULL;
285
27cb34f5
LP		 286 if (link->network->dhcp_hostname)
287 hostname = link->network->dhcp_hostname;
dce391e7
LP		 288 else
289 (void) sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname);
a7d0ef44 290
dce391e7
LP		 291 if (hostname) {
292 /* If a hostname was set due to the lease, then unset it now. */
59eb33e0 293 r = manager_set_hostname(link->manager, NULL);
3c9b8860 294 if (r < 0)
dce391e7 295 log_link_warning_errno(link, r, "Failed to reset transient hostname: %m");
3c9b8860
TG		 296 }
297 }
298
299 link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
6a3e5f6a 300 link_dirty(link);
3c9b8860
TG		 301 link->dhcp4_configured = false;
302
303 return 0;
304}
305
1c4baffc 306static int dhcp4_address_handler(sd_netlink *rtnl, sd_netlink_message *m,
3c9b8860 307 void *userdata) {
8e766630 308 _cleanup_(link_unrefp) Link *link = userdata;
3c9b8860
TG		 309 int r;
310
311 assert(link);
312
1c4baffc 313 r = sd_netlink_message_get_errno(m);
3c9b8860 314 if (r < 0 && r != -EEXIST) {
f6b8196f 315 log_link_error_errno(link, r, "Could not set DHCPv4 address: %m");
3c9b8860 316 link_enter_failed(link);
45af44d4 317 } else if (r >= 0)
200a0868 318 manager_rtnl_process_address(rtnl, m, link->manager);
3c9b8860
TG		 319
320 link_set_dhcp_routes(link);
321
223932c7
AH		 322 if (link->dhcp4_messages == 0) {
323 link->dhcp4_configured = true;
324 link_check_ready(link);
325 }
326
3c9b8860
TG		 327 return 1;
328}
329
330static int dhcp4_update_address(Link *link,
331 struct in_addr *address,
332 struct in_addr *netmask,
333 uint32_t lifetime) {
8e766630 334 _cleanup_(address_freep) Address *addr = NULL;
3c9b8860
TG		 335 unsigned prefixlen;
336 int r;
337
338 assert(address);
339 assert(netmask);
340 assert(lifetime);
341
5a941f5f 342 prefixlen = in4_addr_netmask_to_prefixlen(netmask);
3c9b8860 343
f0213e37 344 r = address_new(&addr);
3c9b8860
TG		 345 if (r < 0)
346 return r;
347
348 addr->family = AF_INET;
349 addr->in_addr.in.s_addr = address->s_addr;
350 addr->cinfo.ifa_prefered = lifetime;
351 addr->cinfo.ifa_valid = lifetime;
352 addr->prefixlen = prefixlen;
353 addr->broadcast.s_addr = address->s_addr | ~netmask->s_addr;
354
66669078
TG		 355 /* allow reusing an existing address and simply update its lifetime
356 * in case it already exists */
483d099e 357 r = address_configure(addr, link, dhcp4_address_handler, true);
3c9b8860
TG		 358 if (r < 0)
359 return r;
360
361 return 0;
362}
363
364static int dhcp_lease_renew(sd_dhcp_client *client, Link *link) {
365 sd_dhcp_lease *lease;
366 struct in_addr address;
367 struct in_addr netmask;
368 uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
369 int r;
370
371 assert(link);
372 assert(client);
373 assert(link->network);
374
375 r = sd_dhcp_client_get_lease(client, &lease);
f6b8196f
LP		 376 if (r < 0)
377 return log_link_warning_errno(link, r, "DHCP error: no lease: %m");
3c9b8860
TG		 378
379 sd_dhcp_lease_unref(link->dhcp_lease);
380 link->dhcp4_configured = false;
e6b18ffa 381 link->dhcp_lease = sd_dhcp_lease_ref(lease);
6a3e5f6a 382 link_dirty(link);
3c9b8860
TG		 383
384 r = sd_dhcp_lease_get_address(lease, &address);
f6b8196f
LP		 385 if (r < 0)
386 return log_link_warning_errno(link, r, "DHCP error: no address: %m");
3c9b8860
TG		 387
388 r = sd_dhcp_lease_get_netmask(lease, &netmask);
f6b8196f
LP		 389 if (r < 0)
390 return log_link_warning_errno(link, r, "DHCP error: no netmask: %m");
3c9b8860
TG		 391
392 if (!link->network->dhcp_critical) {
f6b8196f
LP		 393 r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, &lifetime);
394 if (r < 0)
395 return log_link_warning_errno(link, r, "DHCP error: no lifetime: %m");
3c9b8860
TG		 396 }
397
398 r = dhcp4_update_address(link, &address, &netmask, lifetime);
399 if (r < 0) {
f6b8196f 400 log_link_warning_errno(link, r, "Could not update IP address: %m");
3c9b8860
TG		 401 link_enter_failed(link);
402 return r;
403 }
404
405 return 0;
406}
407
408static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) {
409 sd_dhcp_lease *lease;
410 struct in_addr address;
411 struct in_addr netmask;
412 struct in_addr gateway;
413 unsigned prefixlen;
414 uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
415 int r;
416
417 assert(client);
418 assert(link);
419
420 r = sd_dhcp_client_get_lease(client, &lease);
f2341e0a 421 if (r < 0)
f6b8196f 422 return log_link_error_errno(link, r, "DHCP error: No lease: %m");
3c9b8860
TG		 423
424 r = sd_dhcp_lease_get_address(lease, &address);
f2341e0a 425 if (r < 0)
f6b8196f 426 return log_link_error_errno(link, r, "DHCP error: No address: %m");
3c9b8860
TG		 427
428 r = sd_dhcp_lease_get_netmask(lease, &netmask);
f2341e0a 429 if (r < 0)
f6b8196f 430 return log_link_error_errno(link, r, "DHCP error: No netmask: %m");
3c9b8860 431
5a941f5f 432 prefixlen = in4_addr_netmask_to_prefixlen(&netmask);
3c9b8860
TG		 433
434 r = sd_dhcp_lease_get_router(lease, &gateway);
397d15fd 435 if (r < 0 && r != -ENODATA)
f6b8196f 436 return log_link_error_errno(link, r, "DHCP error: Could not get gateway: %m");
3c9b8860
TG		 437
438 if (r >= 0)
f2341e0a
LP		 439 log_struct(LOG_INFO,
440 LOG_LINK_INTERFACE(link),
441 LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u",
442 ADDRESS_FMT_VAL(address),
443 prefixlen,
444 ADDRESS_FMT_VAL(gateway)),
445 "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address),
446 "PREFIXLEN=%u", prefixlen,
a1230ff9 447 "GATEWAY=%u.%u.%u.%u", ADDRESS_FMT_VAL(gateway));
3c9b8860 448 else
f2341e0a
LP		 449 log_struct(LOG_INFO,
450 LOG_LINK_INTERFACE(link),
451 LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u",
452 ADDRESS_FMT_VAL(address),
453 prefixlen),
454 "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address),
a1230ff9 455 "PREFIXLEN=%u", prefixlen);
3c9b8860 456
e6b18ffa 457 link->dhcp_lease = sd_dhcp_lease_ref(lease);
6a3e5f6a 458 link_dirty(link);
3c9b8860 459
27cb34f5 460 if (link->network->dhcp_use_mtu) {
3c9b8860
TG		 461 uint16_t mtu;
462
463 r = sd_dhcp_lease_get_mtu(lease, &mtu);
464 if (r >= 0) {
465 r = link_set_mtu(link, mtu);
466 if (r < 0)
f2341e0a 467 log_link_error_errno(link, r, "Failed to set MTU to %" PRIu16 ": %m", mtu);
3c9b8860
TG		 468 }
469 }
470
27cb34f5 471 if (link->network->dhcp_use_hostname) {
2de2abad
LB		 472 const char *dhcpname = NULL;
473 _cleanup_free_ char *hostname = NULL;
3c9b8860 474
27cb34f5 475 if (link->network->dhcp_hostname)
2de2abad 476 dhcpname = link->network->dhcp_hostname;
dce391e7 477 else
2de2abad
LB		 478 (void) sd_dhcp_lease_get_hostname(lease, &dhcpname);
479
480 if (dhcpname) {
481 r = shorten_overlong(dhcpname, &hostname);
482 if (r < 0)
483 log_link_warning_errno(link, r, "Unable to shorten overlong DHCP hostname '%s', ignoring: %m", dhcpname);
484 if (r == 1)
485 log_link_notice(link, "Overlong DCHP hostname received, shortened from '%s' to '%s'", dhcpname, hostname);
486 }
a7d0ef44 487
dce391e7 488 if (hostname) {
59eb33e0 489 r = manager_set_hostname(link->manager, hostname);
3c9b8860 490 if (r < 0)
f2341e0a 491 log_link_error_errno(link, r, "Failed to set transient hostname to '%s': %m", hostname);
3c9b8860
TG		 492 }
493 }
494
27cb34f5 495 if (link->network->dhcp_use_timezone) {
21b80ad1
LP		 496 const char *tz = NULL;
497
498 (void) sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
499
500 if (tz) {
59eb33e0 501 r = manager_set_timezone(link->manager, tz);
21b80ad1
LP		 502 if (r < 0)
503 log_link_error_errno(link, r, "Failed to set timezone to '%s': %m", tz);
504 }
505 }
506
3c9b8860 507 if (!link->network->dhcp_critical) {
f2341e0a 508 r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, &lifetime);
3c9b8860 509 if (r < 0) {
f2341e0a 510 log_link_warning_errno(link, r, "DHCP error: no lifetime: %m");
3c9b8860
TG		 511 return r;
512 }
513 }
514
515 r = dhcp4_update_address(link, &address, &netmask, lifetime);
516 if (r < 0) {
f2341e0a 517 log_link_warning_errno(link, r, "Could not update IP address: %m");
3c9b8860
TG		 518 link_enter_failed(link);
519 return r;
520 }
521
522 return 0;
523}
524static void dhcp4_handler(sd_dhcp_client *client, int event, void *userdata) {
525 Link *link = userdata;
526 int r = 0;
527
528 assert(link);
529 assert(link->network);
530 assert(link->manager);
531
532 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
533 return;
534
535 switch (event) {
03748142
DH		 536 case SD_DHCP_CLIENT_EVENT_EXPIRED:
537 case SD_DHCP_CLIENT_EVENT_STOP:
538 case SD_DHCP_CLIENT_EVENT_IP_CHANGE:
3c9b8860 539 if (link->network->dhcp_critical) {
f6b8196f 540 log_link_error(link, "DHCPv4 connection considered system critical, ignoring request to reconfigure it.");
3c9b8860
TG		 541 return;
542 }
543
544 if (link->dhcp_lease) {
545 r = dhcp_lease_lost(link);
546 if (r < 0) {
547 link_enter_failed(link);
548 return;
549 }
550 }
551
03748142 552 if (event == SD_DHCP_CLIENT_EVENT_IP_CHANGE) {
3c9b8860
TG		 553 r = dhcp_lease_acquired(client, link);
554 if (r < 0) {
555 link_enter_failed(link);
556 return;
557 }
558 }
559
560 break;
03748142 561 case SD_DHCP_CLIENT_EVENT_RENEW:
3c9b8860
TG		 562 r = dhcp_lease_renew(client, link);
563 if (r < 0) {
564 link_enter_failed(link);
565 return;
566 }
567 break;
03748142 568 case SD_DHCP_CLIENT_EVENT_IP_ACQUIRE:
3c9b8860
TG		 569 r = dhcp_lease_acquired(client, link);
570 if (r < 0) {
571 link_enter_failed(link);
572 return;
573 }
574 break;
575 default:
576 if (event < 0)
f6b8196f 577 log_link_warning_errno(link, event, "DHCP error: Client failed: %m");
3c9b8860 578 else
f6b8196f 579 log_link_warning(link, "DHCP unknown event: %i", event);
3c9b8860
TG		 580 break;
581 }
582
583 return;
584}
585
7192bb81
LP		 586static int dhcp4_set_hostname(Link *link) {
587 _cleanup_free_ char *hostname = NULL;
588 const char *hn;
589 int r;
590
591 assert(link);
592
593 if (!link->network->dhcp_send_hostname)
594 hn = NULL;
595 else if (link->network->dhcp_hostname)
596 hn = link->network->dhcp_hostname;
597 else {
598 r = gethostname_strict(&hostname);
599 if (r < 0 && r != -ENXIO) /* ENXIO: no hostname set or hostname is "localhost" */
600 return r;
601
602 hn = hostname;
603 }
604
605 return sd_dhcp_client_set_hostname(link->dhcp_client, hn);
606}
607
64b21ece 608static bool promote_secondaries_enabled(const char *ifname) {
3f550c31
HV		 609 _cleanup_free_ char *promote_secondaries_sysctl = NULL;
610 char *promote_secondaries_path;
64b21ece
MV		 611 int r;
612
613 promote_secondaries_path = strjoina("net/ipv4/conf/", ifname, "/promote_secondaries");
614 r = sysctl_read(promote_secondaries_path, &promote_secondaries_sysctl);
615 if (r < 0) {
616 log_debug_errno(r, "Cannot read sysctl %s", promote_secondaries_path);
617 return false;
618 }
619
620 truncate_nl(promote_secondaries_sysctl);
621 r = parse_boolean(promote_secondaries_sysctl);
622 if (r < 0)
623 log_warning_errno(r, "Cannot parse sysctl %s with content %s as boolean", promote_secondaries_path, promote_secondaries_sysctl);
624 return r > 0;
625}
626
627/* dhcp4_set_promote_secondaries will ensure this interface has
628 * the "promote_secondaries" option in the kernel set. If this sysctl
629 * is not set DHCP will work only as long as the IP address does not
630 * changes between leases. The kernel will remove all secondary IP
631 * addresses of an interface otherwise. The way systemd-network works
632 * is that the new IP of a lease is added as a secondary IP and when
633 * the primary one expires it relies on the kernel to promote the
634 * secondary IP. See also https://github.com/systemd/systemd/issues/7163
635 */
636int dhcp4_set_promote_secondaries(Link *link) {
637 int r;
638
639 assert(link);
640 assert(link->network);
641 assert(link->network->dhcp & ADDRESS_FAMILY_IPV4);
642
643 /* check if the kernel has promote_secondaries enabled for our
644 * interface. If it is not globally enabled or enabled for the
645 * specific interface we must either enable it.
646 */
8e1a7253 647 if (!(promote_secondaries_enabled("all") || promote_secondaries_enabled(link->ifname))) {
64b21ece
MV		 648 char *promote_secondaries_path = NULL;
649
650 log_link_debug(link, "promote_secondaries is unset, setting it");
651 promote_secondaries_path = strjoina("net/ipv4/conf/", link->ifname, "/promote_secondaries");
652 r = sysctl_write(promote_secondaries_path, "1");
653 if (r < 0)
654 log_link_warning_errno(link, r, "cannot set sysctl %s to 1", promote_secondaries_path);
655 return r > 0;
656 }
657
658 return 0;
659}
660
3c9b8860
TG		 661int dhcp4_configure(Link *link) {
662 int r;
663
664 assert(link);
665 assert(link->network);
e0ee46f2 666 assert(link->network->dhcp & ADDRESS_FAMILY_IPV4);
3c9b8860 667
0bc70f1d 668 if (!link->dhcp_client) {
db3d2358 669 r = sd_dhcp_client_new(&link->dhcp_client, link->network->dhcp_anonymize);
0bc70f1d
TG		 670 if (r < 0)
671 return r;
672 }
3c9b8860
TG		 673
674 r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
675 if (r < 0)
676 return r;
677
76253e73
DW		 678 r = sd_dhcp_client_set_mac(link->dhcp_client,
679 (const uint8_t *) &link->mac,
680 sizeof (link->mac), ARPHRD_ETHER);
3c9b8860
TG		 681 if (r < 0)
682 return r;
683
2f8e7633 684 r = sd_dhcp_client_set_ifindex(link->dhcp_client, link->ifindex);
3c9b8860
TG		 685 if (r < 0)
686 return r;
687
688 r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp4_handler, link);
689 if (r < 0)
690 return r;
691
692 r = sd_dhcp_client_set_request_broadcast(link->dhcp_client,
693 link->network->dhcp_broadcast);
694 if (r < 0)
695 return r;
696
697 if (link->mtu) {
698 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
699 if (r < 0)
700 return r;
701 }
702
27cb34f5 703 if (link->network->dhcp_use_mtu) {
39745a5a 704 r = sd_dhcp_client_set_request_option(link->dhcp_client,
22805d92 705 SD_DHCP_OPTION_INTERFACE_MTU);
39745a5a
LP		 706 if (r < 0)
707 return r;
3c9b8860
TG		 708 }
709
5e77a146 710 /* NOTE: even if this variable is called "use", it also "sends" PRL
711 * options, maybe there should be a different configuration variable
712 * to send or not route options?. */
28522b0d 713 /* NOTE: when using Anonymize=yes, routes PRL options are sent
714 * by default, so they don't need to be added here. */
5e77a146 715 if (link->network->dhcp_use_routes && !link->network->dhcp_anonymize) {
3c9b8860 716 r = sd_dhcp_client_set_request_option(link->dhcp_client,
22805d92 717 SD_DHCP_OPTION_STATIC_ROUTE);
3c9b8860
TG		 718 if (r < 0)
719 return r;
720 r = sd_dhcp_client_set_request_option(link->dhcp_client,
22805d92 721 SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE);
7d6884b6
TA		 722 if (r < 0)
723 return r;
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)
729 return r;
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)
735 return r;
736 }
8eb9058d 737
7192bb81
LP		 738 r = dhcp4_set_hostname(link);
739 if (r < 0)
740 return r;
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)
746 return r;
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)
752 return r;
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)
758 return r;
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
VK		 771 if (r < 0)
772 return r;
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)
784 return r;
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
JJ		 792 if (r < 0)
793 return r;
794 break;
795 default:
796 assert_not_reached("Unknown client identifier type.");
797 }
798
3c9b8860
TG		 799 return 0;
800}
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