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network: introduce Network::ipv6_accept_ra_route_table_set flag
[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
302a796f 17static int dhcp4_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3c9b8860
TG		 18 int r;
19
20 assert(link);
6cf4a01c 21 assert(link->dhcp4_messages > 0);
3c9b8860 22
313cefa1 23 link->dhcp4_messages--;
3c9b8860 24
1c4baffc 25 r = sd_netlink_message_get_errno(m);
3c9b8860 26 if (r < 0 && r != -EEXIST) {
f6b8196f 27 log_link_error_errno(link, r, "Could not set DHCPv4 route: %m");
3c9b8860
TG		 28 link_enter_failed(link);
29 }
30
6cf4a01c 31 if (link->dhcp4_messages == 0) {
3c9b8860 32 link->dhcp4_configured = true;
8012cd39 33 link_check_ready(link);
3c9b8860
TG		 34 }
35
36 return 1;
37}
38
d6eac9bd
DW		 39static int route_scope_from_address(const Route *route, const struct in_addr *self_addr) {
40 assert(route);
41 assert(self_addr);
42
43 if (in_addr_is_localhost(AF_INET, &route->dst) ||
44 (self_addr->s_addr && route->dst.in.s_addr == self_addr->s_addr))
45 return RT_SCOPE_HOST;
46 else if (in4_addr_is_null(&route->gw.in))
47 return RT_SCOPE_LINK;
48 else
49 return RT_SCOPE_UNIVERSE;
50}
51
3c9b8860 52static int link_set_dhcp_routes(Link *link) {
f8693fc7 53 _cleanup_free_ sd_dhcp_route **static_routes = NULL;
8cdc46e7
SS		 54 bool classless_route = false, static_route = false;
55 struct in_addr gateway, address;
3c9b8860 56 int r, n, i;
fc1ba79d 57 uint32_t table;
3c9b8860
TG		 58
59 assert(link);
0c9b15a3
AJ		 60
61 if (!link->dhcp_lease) /* link went down while we configured the IP addresses? */
62 return 0;
63
64 if (!link->network) /* link went down while we configured the IP addresses? */
65 return 0;
964b26fe
SS		 66
67 if (!link->network->dhcp_use_routes)
68 return 0;
3c9b8860 69
fc1ba79d
AR		 70 /* When the interface is part of an VRF use the VRFs routing table, unless
71 * there is a another table specified. */
72 table = link->network->dhcp_route_table;
860e636c 73 if (!link->network->dhcp_route_table_set && link->network->vrf)
fc1ba79d
AR		 74 table = VRF(link->network->vrf)->table;
75
b23aec0d
DW		 76 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
77 if (r < 0)
78 return log_link_warning_errno(link, r, "DHCP error: could not get address: %m");
79
5f04a209 80 n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes);
599c44e6
YW		 81 if (n == -ENODATA)
82 log_link_debug_errno(link, n, "DHCP: No routes received from DHCP server: %m");
83 else if (n < 0)
8dc787d1 84 log_link_debug_errno(link, n, "DHCP error: could not get routes: %m");
5f04a209 85
8cdc46e7 86 for (i = 0; i < n; i++) {
3476951c
TH		 87 switch (sd_dhcp_route_get_option(static_routes[i])) {
88 case SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE:
8cdc46e7 89 classless_route = true;
3476951c
TH		 90 break;
91 case SD_DHCP_OPTION_STATIC_ROUTE:
8cdc46e7 92 static_route = true;
3476951c
TH		 93 break;
94 }
8cdc46e7
SS		 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. */
3476951c
TH		 102 if (classless_route &&
103 sd_dhcp_route_get_option(static_routes[i]) != SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE)
8cdc46e7
SS		 104 continue;
105
5f04a209
SS		 106 r = route_new(&route);
107 if (r < 0)
108 return log_link_error_errno(link, r, "Could not allocate route: %m");
109
110 route->family = AF_INET;
111 route->protocol = RTPROT_DHCP;
112 assert_se(sd_dhcp_route_get_gateway(static_routes[i], &route->gw.in) >= 0);
113 assert_se(sd_dhcp_route_get_destination(static_routes[i], &route->dst.in) >= 0);
114 assert_se(sd_dhcp_route_get_destination_prefix_length(static_routes[i], &route->dst_prefixlen) >= 0);
115 route->priority = link->network->dhcp_route_metric;
116 route->table = table;
117 route->scope = route_scope_from_address(route, &address);
118
119 r = route_configure(route, link, dhcp4_route_handler);
120 if (r < 0)
121 return log_link_warning_errno(link, r, "Could not set host route: %m");
122
123 link->dhcp4_messages++;
124 }
125
3c9b8860 126 r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
444b0170 127 if (r == -ENODATA)
fb14aa7e 128 log_link_info_errno(link, r, "DHCP: No gateway received from DHCP server: %m");
444b0170
SS		 129 else if (r < 0)
130 log_link_warning_errno(link, r, "DHCP error: could not get gateway: %m");
f6b8196f 131
5f04a209
SS		 132 /* According to RFC 3442: If the DHCP server returns both a Classless Static Routes option and
133 a Router option, the DHCP client MUST ignore the Router option. */
8cdc46e7
SS		 134 if (classless_route && static_route)
135 log_link_warning(link, "Classless static routes received from DHCP server: ignoring static-route option and router option");
136
137 if (r >= 0 && !classless_route) {
860e636c 138 _cleanup_(route_freep) Route *route = NULL, *route_gw = NULL;
ed9e361a
TG		 139
140 r = route_new(&route_gw);
f6b8196f
LP		 141 if (r < 0)
142 return log_link_error_errno(link, r, "Could not allocate route: %m");
3c9b8860
TG		 143
144 /* The dhcp netmask may mask out the gateway. Add an explicit
145 * route for the gw host so that we can route no matter the
146 * netmask or existing kernel route tables. */
147 route_gw->family = AF_INET;
2ce40956 148 route_gw->dst.in = gateway;
3c9b8860 149 route_gw->dst_prefixlen = 32;
2ce40956 150 route_gw->prefsrc.in = address;
3c9b8860 151 route_gw->scope = RT_SCOPE_LINK;
ed9e361a 152 route_gw->protocol = RTPROT_DHCP;
86655331 153 route_gw->priority = link->network->dhcp_route_metric;
fc1ba79d 154 route_gw->table = table;
3c9b8860 155
483d099e 156 r = route_configure(route_gw, link, dhcp4_route_handler);
f6b8196f
LP		 157 if (r < 0)
158 return log_link_warning_errno(link, r, "Could not set host route: %m");
3c9b8860 159
313cefa1 160 link->dhcp4_messages++;
3c9b8860 161
860e636c
YW		 162 r = route_new(&route);
163 if (r < 0)
164 return log_link_error_errno(link, r, "Could not allocate route: %m");
165
3c9b8860 166 route->family = AF_INET;
2ce40956
TG		 167 route->gw.in = gateway;
168 route->prefsrc.in = address;
860e636c 169 route->protocol = RTPROT_DHCP;
86655331 170 route->priority = link->network->dhcp_route_metric;
fc1ba79d 171 route->table = table;
3c9b8860 172
483d099e 173 r = route_configure(route, link, dhcp4_route_handler);
3c9b8860 174 if (r < 0) {
f6b8196f 175 log_link_warning_errno(link, r, "Could not set routes: %m");
3c9b8860
TG		 176 link_enter_failed(link);
177 return r;
178 }
179
313cefa1 180 link->dhcp4_messages++;
3c9b8860
TG		 181 }
182
3c9b8860
TG		 183 return 0;
184}
185
186static int dhcp_lease_lost(Link *link) {
8e766630 187 _cleanup_(address_freep) Address *address = NULL;
3c9b8860
TG		 188 struct in_addr addr;
189 struct in_addr netmask;
190 struct in_addr gateway;
f414a269 191 unsigned prefixlen = 0;
3c9b8860
TG		 192 int r;
193
194 assert(link);
195 assert(link->dhcp_lease);
196
79008bdd 197 log_link_warning(link, "DHCP lease lost");
3c9b8860 198
27cb34f5 199 if (link->network->dhcp_use_routes) {
f8693fc7 200 _cleanup_free_ sd_dhcp_route **routes = NULL;
3c9b8860
TG		 201 int n, i;
202
203 n = sd_dhcp_lease_get_routes(link->dhcp_lease, &routes);
204 if (n >= 0) {
205 for (i = 0; i < n; i++) {
8e766630 206 _cleanup_(route_freep) Route *route = NULL;
3c9b8860 207
ed9e361a 208 r = route_new(&route);
3c9b8860
TG		 209 if (r >= 0) {
210 route->family = AF_INET;
f8693fc7
BG		 211 assert_se(sd_dhcp_route_get_gateway(routes[i], &route->gw.in) >= 0);
212 assert_se(sd_dhcp_route_get_destination(routes[i], &route->dst.in) >= 0);
213 assert_se(sd_dhcp_route_get_destination_prefix_length(routes[i], &route->dst_prefixlen) >= 0);
3c9b8860 214
4645ad47 215 route_remove(route, link, NULL);
3c9b8860
TG		 216 }
217 }
218 }
219 }
220
f0213e37 221 r = address_new(&address);
3c9b8860
TG		 222 if (r >= 0) {
223 r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
224 if (r >= 0) {
8e766630
LP		 225 _cleanup_(route_freep) Route *route_gw = NULL;
226 _cleanup_(route_freep) Route *route = NULL;
3c9b8860 227
ed9e361a 228 r = route_new(&route_gw);
3c9b8860
TG		 229 if (r >= 0) {
230 route_gw->family = AF_INET;
2ce40956 231 route_gw->dst.in = gateway;
3c9b8860
TG		 232 route_gw->dst_prefixlen = 32;
233 route_gw->scope = RT_SCOPE_LINK;
234
4645ad47 235 route_remove(route_gw, link, NULL);
3c9b8860
TG		 236 }
237
ed9e361a 238 r = route_new(&route);
3c9b8860
TG		 239 if (r >= 0) {
240 route->family = AF_INET;
2ce40956 241 route->gw.in = gateway;
3c9b8860 242
4645ad47 243 route_remove(route, link, NULL);
3c9b8860
TG		 244 }
245 }
246
f414a269
TG		 247 r = sd_dhcp_lease_get_address(link->dhcp_lease, &addr);
248 if (r >= 0) {
249 r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
250 if (r >= 0)
5a941f5f 251 prefixlen = in4_addr_netmask_to_prefixlen(&netmask);
3c9b8860 252
f414a269
TG		 253 address->family = AF_INET;
254 address->in_addr.in = addr;
255 address->prefixlen = prefixlen;
3c9b8860 256
63ae0569 257 address_remove(address, link, NULL);
f414a269 258 }
3c9b8860
TG		 259 }
260
27cb34f5 261 if (link->network->dhcp_use_mtu) {
3c9b8860
TG		 262 uint16_t mtu;
263
264 r = sd_dhcp_lease_get_mtu(link->dhcp_lease, &mtu);
265 if (r >= 0 && link->original_mtu != mtu) {
266 r = link_set_mtu(link, link->original_mtu);
267 if (r < 0) {
79008bdd 268 log_link_warning(link,
3c9b8860
TG		 269 "DHCP error: could not reset MTU");
270 link_enter_failed(link);
271 return r;
272 }
273 }
274 }
275
27cb34f5 276 if (link->network->dhcp_use_hostname) {
3c9b8860
TG		 277 const char *hostname = NULL;
278
27cb34f5
LP		 279 if (link->network->dhcp_hostname)
280 hostname = link->network->dhcp_hostname;
dce391e7
LP		 281 else
282 (void) sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname);
a7d0ef44 283
dce391e7
LP		 284 if (hostname) {
285 /* If a hostname was set due to the lease, then unset it now. */
59eb33e0 286 r = manager_set_hostname(link->manager, NULL);
3c9b8860 287 if (r < 0)
dce391e7 288 log_link_warning_errno(link, r, "Failed to reset transient hostname: %m");
3c9b8860
TG		 289 }
290 }
291
292 link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
6a3e5f6a 293 link_dirty(link);
3c9b8860
TG		 294 link->dhcp4_configured = false;
295
296 return 0;
297}
298
302a796f 299static int dhcp4_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3c9b8860
TG		 300 int r;
301
302 assert(link);
303
1c4baffc 304 r = sd_netlink_message_get_errno(m);
3c9b8860 305 if (r < 0 && r != -EEXIST) {
f6b8196f 306 log_link_error_errno(link, r, "Could not set DHCPv4 address: %m");
3c9b8860 307 link_enter_failed(link);
45af44d4 308 } else if (r >= 0)
200a0868 309 manager_rtnl_process_address(rtnl, m, link->manager);
3c9b8860
TG		 310
311 link_set_dhcp_routes(link);
312
223932c7
AH		 313 if (link->dhcp4_messages == 0) {
314 link->dhcp4_configured = true;
315 link_check_ready(link);
316 }
317
3c9b8860
TG		 318 return 1;
319}
320
321static int dhcp4_update_address(Link *link,
322 struct in_addr *address,
323 struct in_addr *netmask,
324 uint32_t lifetime) {
8e766630 325 _cleanup_(address_freep) Address *addr = NULL;
3c9b8860
TG		 326 unsigned prefixlen;
327 int r;
328
329 assert(address);
330 assert(netmask);
331 assert(lifetime);
332
5a941f5f 333 prefixlen = in4_addr_netmask_to_prefixlen(netmask);
3c9b8860 334
f0213e37 335 r = address_new(&addr);
3c9b8860
TG		 336 if (r < 0)
337 return r;
338
339 addr->family = AF_INET;
340 addr->in_addr.in.s_addr = address->s_addr;
341 addr->cinfo.ifa_prefered = lifetime;
342 addr->cinfo.ifa_valid = lifetime;
343 addr->prefixlen = prefixlen;
344 addr->broadcast.s_addr = address->s_addr | ~netmask->s_addr;
345
66669078
TG		 346 /* allow reusing an existing address and simply update its lifetime
347 * in case it already exists */
483d099e 348 r = address_configure(addr, link, dhcp4_address_handler, true);
3c9b8860
TG		 349 if (r < 0)
350 return r;
351
352 return 0;
353}
354
355static int dhcp_lease_renew(sd_dhcp_client *client, Link *link) {
356 sd_dhcp_lease *lease;
357 struct in_addr address;
358 struct in_addr netmask;
359 uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
360 int r;
361
362 assert(link);
363 assert(client);
364 assert(link->network);
365
366 r = sd_dhcp_client_get_lease(client, &lease);
f6b8196f
LP		 367 if (r < 0)
368 return log_link_warning_errno(link, r, "DHCP error: no lease: %m");
3c9b8860
TG		 369
370 sd_dhcp_lease_unref(link->dhcp_lease);
371 link->dhcp4_configured = false;
e6b18ffa 372 link->dhcp_lease = sd_dhcp_lease_ref(lease);
6a3e5f6a 373 link_dirty(link);
3c9b8860
TG		 374
375 r = sd_dhcp_lease_get_address(lease, &address);
f6b8196f
LP		 376 if (r < 0)
377 return log_link_warning_errno(link, r, "DHCP error: no address: %m");
3c9b8860
TG		 378
379 r = sd_dhcp_lease_get_netmask(lease, &netmask);
f6b8196f
LP		 380 if (r < 0)
381 return log_link_warning_errno(link, r, "DHCP error: no netmask: %m");
3c9b8860
TG		 382
383 if (!link->network->dhcp_critical) {
f6b8196f
LP		 384 r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, &lifetime);
385 if (r < 0)
386 return log_link_warning_errno(link, r, "DHCP error: no lifetime: %m");
3c9b8860
TG		 387 }
388
389 r = dhcp4_update_address(link, &address, &netmask, lifetime);
390 if (r < 0) {
f6b8196f 391 log_link_warning_errno(link, r, "Could not update IP address: %m");
3c9b8860
TG		 392 link_enter_failed(link);
393 return r;
394 }
395
396 return 0;
397}
398
399static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) {
400 sd_dhcp_lease *lease;
401 struct in_addr address;
402 struct in_addr netmask;
403 struct in_addr gateway;
404 unsigned prefixlen;
405 uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
406 int r;
407
408 assert(client);
409 assert(link);
410
411 r = sd_dhcp_client_get_lease(client, &lease);
f2341e0a 412 if (r < 0)
f6b8196f 413 return log_link_error_errno(link, r, "DHCP error: No lease: %m");
3c9b8860
TG		 414
415 r = sd_dhcp_lease_get_address(lease, &address);
f2341e0a 416 if (r < 0)
f6b8196f 417 return log_link_error_errno(link, r, "DHCP error: No address: %m");
3c9b8860
TG		 418
419 r = sd_dhcp_lease_get_netmask(lease, &netmask);
f2341e0a 420 if (r < 0)
f6b8196f 421 return log_link_error_errno(link, r, "DHCP error: No netmask: %m");
3c9b8860 422
5a941f5f 423 prefixlen = in4_addr_netmask_to_prefixlen(&netmask);
3c9b8860
TG		 424
425 r = sd_dhcp_lease_get_router(lease, &gateway);
397d15fd 426 if (r < 0 && r != -ENODATA)
f6b8196f 427 return log_link_error_errno(link, r, "DHCP error: Could not get gateway: %m");
3c9b8860
TG		 428
429 if (r >= 0)
f2341e0a
LP		 430 log_struct(LOG_INFO,
431 LOG_LINK_INTERFACE(link),
432 LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u",
433 ADDRESS_FMT_VAL(address),
434 prefixlen,
435 ADDRESS_FMT_VAL(gateway)),
436 "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address),
437 "PREFIXLEN=%u", prefixlen,
a1230ff9 438 "GATEWAY=%u.%u.%u.%u", ADDRESS_FMT_VAL(gateway));
3c9b8860 439 else
f2341e0a
LP		 440 log_struct(LOG_INFO,
441 LOG_LINK_INTERFACE(link),
442 LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u",
443 ADDRESS_FMT_VAL(address),
444 prefixlen),
445 "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address),
a1230ff9 446 "PREFIXLEN=%u", prefixlen);
3c9b8860 447
e6b18ffa 448 link->dhcp_lease = sd_dhcp_lease_ref(lease);
6a3e5f6a 449 link_dirty(link);
3c9b8860 450
27cb34f5 451 if (link->network->dhcp_use_mtu) {
3c9b8860
TG		 452 uint16_t mtu;
453
454 r = sd_dhcp_lease_get_mtu(lease, &mtu);
455 if (r >= 0) {
456 r = link_set_mtu(link, mtu);
457 if (r < 0)
f2341e0a 458 log_link_error_errno(link, r, "Failed to set MTU to %" PRIu16 ": %m", mtu);
3c9b8860
TG		 459 }
460 }
461
27cb34f5 462 if (link->network->dhcp_use_hostname) {
2de2abad
LB		 463 const char *dhcpname = NULL;
464 _cleanup_free_ char *hostname = NULL;
3c9b8860 465
27cb34f5 466 if (link->network->dhcp_hostname)
2de2abad 467 dhcpname = link->network->dhcp_hostname;
dce391e7 468 else
2de2abad
LB		 469 (void) sd_dhcp_lease_get_hostname(lease, &dhcpname);
470
471 if (dhcpname) {
472 r = shorten_overlong(dhcpname, &hostname);
473 if (r < 0)
474 log_link_warning_errno(link, r, "Unable to shorten overlong DHCP hostname '%s', ignoring: %m", dhcpname);
475 if (r == 1)
476 log_link_notice(link, "Overlong DCHP hostname received, shortened from '%s' to '%s'", dhcpname, hostname);
477 }
a7d0ef44 478
dce391e7 479 if (hostname) {
59eb33e0 480 r = manager_set_hostname(link->manager, hostname);
3c9b8860 481 if (r < 0)
f2341e0a 482 log_link_error_errno(link, r, "Failed to set transient hostname to '%s': %m", hostname);
3c9b8860
TG		 483 }
484 }
485
27cb34f5 486 if (link->network->dhcp_use_timezone) {
21b80ad1
LP		 487 const char *tz = NULL;
488
489 (void) sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
490
491 if (tz) {
59eb33e0 492 r = manager_set_timezone(link->manager, tz);
21b80ad1
LP		 493 if (r < 0)
494 log_link_error_errno(link, r, "Failed to set timezone to '%s': %m", tz);
495 }
496 }
497
3c9b8860 498 if (!link->network->dhcp_critical) {
f2341e0a 499 r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, &lifetime);
fc95c359
YW		 500 if (r < 0)
501 return log_link_warning_errno(link, r, "DHCP error: no lifetime: %m");
3c9b8860
TG		 502 }
503
504 r = dhcp4_update_address(link, &address, &netmask, lifetime);
505 if (r < 0) {
f2341e0a 506 log_link_warning_errno(link, r, "Could not update IP address: %m");
3c9b8860
TG		 507 link_enter_failed(link);
508 return r;
509 }
510
511 return 0;
512}
513static void dhcp4_handler(sd_dhcp_client *client, int event, void *userdata) {
514 Link *link = userdata;
515 int r = 0;
516
517 assert(link);
518 assert(link->network);
519 assert(link->manager);
520
521 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
522 return;
523
524 switch (event) {
03748142
DH		 525 case SD_DHCP_CLIENT_EVENT_EXPIRED:
526 case SD_DHCP_CLIENT_EVENT_STOP:
527 case SD_DHCP_CLIENT_EVENT_IP_CHANGE:
3c9b8860 528 if (link->network->dhcp_critical) {
f6b8196f 529 log_link_error(link, "DHCPv4 connection considered system critical, ignoring request to reconfigure it.");
3c9b8860
TG		 530 return;
531 }
532
533 if (link->dhcp_lease) {
534 r = dhcp_lease_lost(link);
535 if (r < 0) {
536 link_enter_failed(link);
537 return;
538 }
539 }
540
03748142 541 if (event == SD_DHCP_CLIENT_EVENT_IP_CHANGE) {
3c9b8860
TG		 542 r = dhcp_lease_acquired(client, link);
543 if (r < 0) {
544 link_enter_failed(link);
545 return;
546 }
547 }
548
549 break;
03748142 550 case SD_DHCP_CLIENT_EVENT_RENEW:
3c9b8860
TG		 551 r = dhcp_lease_renew(client, link);
552 if (r < 0) {
553 link_enter_failed(link);
554 return;
555 }
556 break;
03748142 557 case SD_DHCP_CLIENT_EVENT_IP_ACQUIRE:
3c9b8860
TG		 558 r = dhcp_lease_acquired(client, link);
559 if (r < 0) {
560 link_enter_failed(link);
561 return;
562 }
563 break;
564 default:
565 if (event < 0)
f6b8196f 566 log_link_warning_errno(link, event, "DHCP error: Client failed: %m");
3c9b8860 567 else
f6b8196f 568 log_link_warning(link, "DHCP unknown event: %i", event);
3c9b8860
TG		 569 break;
570 }
571
572 return;
573}
574
7192bb81
LP		 575static int dhcp4_set_hostname(Link *link) {
576 _cleanup_free_ char *hostname = NULL;
577 const char *hn;
578 int r;
579
580 assert(link);
581
582 if (!link->network->dhcp_send_hostname)
583 hn = NULL;
584 else if (link->network->dhcp_hostname)
585 hn = link->network->dhcp_hostname;
586 else {
587 r = gethostname_strict(&hostname);
588 if (r < 0 && r != -ENXIO) /* ENXIO: no hostname set or hostname is "localhost" */
589 return r;
590
591 hn = hostname;
592 }
593
a8494759
YW		 594 r = sd_dhcp_client_set_hostname(link->dhcp_client, hn);
595 if (r == -EINVAL && hostname)
596 /* Ignore error when the machine's hostname is not suitable to send in DHCP packet. */
597 log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set hostname from kernel hostname, ignoring: %m");
598 else if (r < 0)
599 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set hostname: %m");
600
601 return 0;
7192bb81
LP		 602}
603
64b21ece 604static bool promote_secondaries_enabled(const char *ifname) {
3f550c31
HV		 605 _cleanup_free_ char *promote_secondaries_sysctl = NULL;
606 char *promote_secondaries_path;
64b21ece
MV		 607 int r;
608
609 promote_secondaries_path = strjoina("net/ipv4/conf/", ifname, "/promote_secondaries");
610 r = sysctl_read(promote_secondaries_path, &promote_secondaries_sysctl);
611 if (r < 0) {
612 log_debug_errno(r, "Cannot read sysctl %s", promote_secondaries_path);
613 return false;
614 }
615
616 truncate_nl(promote_secondaries_sysctl);
617 r = parse_boolean(promote_secondaries_sysctl);
618 if (r < 0)
619 log_warning_errno(r, "Cannot parse sysctl %s with content %s as boolean", promote_secondaries_path, promote_secondaries_sysctl);
620 return r > 0;
621}
622
623/* dhcp4_set_promote_secondaries will ensure this interface has
624 * the "promote_secondaries" option in the kernel set. If this sysctl
625 * is not set DHCP will work only as long as the IP address does not
626 * changes between leases. The kernel will remove all secondary IP
627 * addresses of an interface otherwise. The way systemd-network works
628 * is that the new IP of a lease is added as a secondary IP and when
629 * the primary one expires it relies on the kernel to promote the
630 * secondary IP. See also https://github.com/systemd/systemd/issues/7163
631 */
632int dhcp4_set_promote_secondaries(Link *link) {
633 int r;
634
635 assert(link);
636 assert(link->network);
637 assert(link->network->dhcp & ADDRESS_FAMILY_IPV4);
638
639 /* check if the kernel has promote_secondaries enabled for our
640 * interface. If it is not globally enabled or enabled for the
641 * specific interface we must either enable it.
642 */
8e1a7253 643 if (!(promote_secondaries_enabled("all") || promote_secondaries_enabled(link->ifname))) {
64b21ece
MV		 644 char *promote_secondaries_path = NULL;
645
646 log_link_debug(link, "promote_secondaries is unset, setting it");
647 promote_secondaries_path = strjoina("net/ipv4/conf/", link->ifname, "/promote_secondaries");
648 r = sysctl_write(promote_secondaries_path, "1");
649 if (r < 0)
650 log_link_warning_errno(link, r, "cannot set sysctl %s to 1", promote_secondaries_path);
651 return r > 0;
652 }
653
654 return 0;
655}
656
fff1f40c
YW		 657int dhcp4_set_client_identifier(Link *link) {
658 int r;
659
660 assert(link);
661 assert(link->network);
662 assert(link->dhcp_client);
663
664 switch (link->network->dhcp_client_identifier) {
665 case DHCP_CLIENT_ID_DUID: {
0cf7c3fd 666 /* If configured, apply user specified DUID and IAID */
fff1f40c
YW		 667 const DUID *duid = link_get_duid(link);
668
0cf7c3fd
YW		 669 if (duid->type == DUID_TYPE_LLT && duid->raw_data_len == 0)
670 r = sd_dhcp_client_set_iaid_duid_llt(link->dhcp_client,
8217ed5e 671 link->network->iaid_set,
0cf7c3fd
YW		 672 link->network->iaid,
673 duid->llt_time);
674 else
675 r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
8217ed5e 676 link->network->iaid_set,
0cf7c3fd
YW		 677 link->network->iaid,
678 duid->type,
679 duid->raw_data_len > 0 ? duid->raw_data : NULL,
680 duid->raw_data_len);
fff1f40c 681 if (r < 0)
0cf7c3fd 682 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set IAID+DUID: %m");
fff1f40c
YW		 683 break;
684 }
685 case DHCP_CLIENT_ID_DUID_ONLY: {
686 /* If configured, apply user specified DUID */
687 const DUID *duid = link_get_duid(link);
688
0cf7c3fd
YW		 689 if (duid->type == DUID_TYPE_LLT && duid->raw_data_len == 0)
690 r = sd_dhcp_client_set_duid_llt(link->dhcp_client,
89b3fa66 691 duid->llt_time);
0cf7c3fd
YW		 692 else
693 r = sd_dhcp_client_set_duid(link->dhcp_client,
694 duid->type,
695 duid->raw_data_len > 0 ? duid->raw_data : NULL,
696 duid->raw_data_len);
fff1f40c
YW		 697 if (r < 0)
698 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set DUID: %m");
699 break;
700 }
701 case DHCP_CLIENT_ID_MAC:
702 r = sd_dhcp_client_set_client_id(link->dhcp_client,
703 ARPHRD_ETHER,
704 (const uint8_t *) &link->mac,
705 sizeof(link->mac));
706 if (r < 0)
707 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set client ID: %m");
708 break;
709 default:
710 assert_not_reached("Unknown client identifier type.");
711 }
712
713 return 0;
714}
715
3c9b8860
TG		 716int dhcp4_configure(Link *link) {
717 int r;
718
719 assert(link);
720 assert(link->network);
e0ee46f2 721 assert(link->network->dhcp & ADDRESS_FAMILY_IPV4);
3c9b8860 722
0bc70f1d 723 if (!link->dhcp_client) {
db3d2358 724 r = sd_dhcp_client_new(&link->dhcp_client, link->network->dhcp_anonymize);
1f6860d9
YW		 725 if (r == -ENOMEM)
726 return log_oom();
0bc70f1d 727 if (r < 0)
1f6860d9 728 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to create DHCP4 client: %m");
0bc70f1d 729 }
3c9b8860
TG		 730
731 r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
732 if (r < 0)
1f6860d9 733 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to attach event: %m");
3c9b8860 734
76253e73
DW		 735 r = sd_dhcp_client_set_mac(link->dhcp_client,
736 (const uint8_t *) &link->mac,
737 sizeof (link->mac), ARPHRD_ETHER);
3c9b8860 738 if (r < 0)
1f6860d9 739 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set MAC address: %m");
3c9b8860 740
2f8e7633 741 r = sd_dhcp_client_set_ifindex(link->dhcp_client, link->ifindex);
3c9b8860 742 if (r < 0)
1f6860d9 743 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set ifindex: %m");
3c9b8860
TG		 744
745 r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp4_handler, link);
746 if (r < 0)
1f6860d9 747 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set callback: %m");
3c9b8860
TG		 748
749 r = sd_dhcp_client_set_request_broadcast(link->dhcp_client,
750 link->network->dhcp_broadcast);
751 if (r < 0)
1f6860d9 752 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for broadcast: %m");
3c9b8860
TG		 753
754 if (link->mtu) {
755 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
756 if (r < 0)
1f6860d9 757 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set MTU: %m");
3c9b8860
TG		 758 }
759
27cb34f5 760 if (link->network->dhcp_use_mtu) {
39745a5a 761 r = sd_dhcp_client_set_request_option(link->dhcp_client,
22805d92 762 SD_DHCP_OPTION_INTERFACE_MTU);
39745a5a 763 if (r < 0)
1f6860d9 764 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for MTU: %m");
3c9b8860
TG		 765 }
766
5e77a146 767 /* NOTE: even if this variable is called "use", it also "sends" PRL
768 * options, maybe there should be a different configuration variable
769 * to send or not route options?. */
28522b0d 770 /* NOTE: when using Anonymize=yes, routes PRL options are sent
771 * by default, so they don't need to be added here. */
5e77a146 772 if (link->network->dhcp_use_routes && !link->network->dhcp_anonymize) {
3c9b8860 773 r = sd_dhcp_client_set_request_option(link->dhcp_client,
22805d92 774 SD_DHCP_OPTION_STATIC_ROUTE);
3c9b8860 775 if (r < 0)
1f6860d9
YW		 776 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for static route: %m");
777
3c9b8860 778 r = sd_dhcp_client_set_request_option(link->dhcp_client,
22805d92 779 SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE);
7d6884b6 780 if (r < 0)
1f6860d9 781 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for classless static route: %m");
3c9b8860
TG		 782 }
783
ead36ce6 784 if (link->network->dhcp_use_ntp) {
785 r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NTP_SERVER);
786 if (r < 0)
1f6860d9 787 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for NTP server: %m");
ead36ce6 788 }
4b7b5abb 789
89573b37 790 if (link->network->dhcp_use_timezone) {
791 r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NEW_TZDB_TIMEZONE);
792 if (r < 0)
1f6860d9 793 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for timezone: %m");
89573b37 794 }
8eb9058d 795
7192bb81
LP		 796 r = dhcp4_set_hostname(link);
797 if (r < 0)
a8494759 798 return r;
3c9b8860
TG		 799
800 if (link->network->dhcp_vendor_class_identifier) {
801 r = sd_dhcp_client_set_vendor_class_identifier(link->dhcp_client,
802 link->network->dhcp_vendor_class_identifier);
803 if (r < 0)
1f6860d9 804 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set vendor class identifier: %m");
3c9b8860
TG		 805 }
806
af1c0de0
SS		 807 if (link->network->dhcp_user_class) {
808 r = sd_dhcp_client_set_user_class(link->dhcp_client, (const char **) link->network->dhcp_user_class);
809 if (r < 0)
1f6860d9 810 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set user class: %m");
af1c0de0
SS		 811 }
812
9faed222
SS		 813 if (link->network->dhcp_client_port) {
814 r = sd_dhcp_client_set_client_port(link->dhcp_client, link->network->dhcp_client_port);
815 if (r < 0)
1f6860d9 816 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set listen port: %m");
9faed222
SS		 817 }
818
fff1f40c 819 return dhcp4_set_client_identifier(link);
3c9b8860 820}
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