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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
3c9b8860 | 2 | /*** |
96b2fb93 | 3 | Copyright © 2013-2014 Tom Gundersen <teg@jklm.no> |
3c9b8860 TG |
4 | ***/ |
5 | ||
6 | #include <netinet/ether.h> | |
7 | #include <linux/if.h> | |
8 | ||
b5efdb8a LP |
9 | #include "alloc-util.h" |
10 | #include "dhcp-lease-internal.h" | |
958b66ea | 11 | #include "hostname-util.h" |
64b21ece | 12 | #include "parse-util.h" |
fc1ba79d | 13 | #include "netdev/vrf.h" |
3c9b8860 | 14 | #include "network-internal.h" |
23f53b99 TG |
15 | #include "networkd-link.h" |
16 | #include "networkd-manager.h" | |
17 | #include "networkd-network.h" | |
64b21ece MV |
18 | #include "string-util.h" |
19 | #include "sysctl-util.h" | |
3c9b8860 | 20 | |
1c4baffc | 21 | static int dhcp4_route_handler(sd_netlink *rtnl, sd_netlink_message *m, |
3c9b8860 | 22 | void *userdata) { |
8e766630 | 23 | _cleanup_(link_unrefp) Link *link = userdata; |
3c9b8860 TG |
24 | int r; |
25 | ||
26 | assert(link); | |
6cf4a01c | 27 | assert(link->dhcp4_messages > 0); |
3c9b8860 | 28 | |
313cefa1 | 29 | link->dhcp4_messages--; |
3c9b8860 | 30 | |
1c4baffc | 31 | r = sd_netlink_message_get_errno(m); |
3c9b8860 | 32 | if (r < 0 && r != -EEXIST) { |
f6b8196f | 33 | log_link_error_errno(link, r, "Could not set DHCPv4 route: %m"); |
3c9b8860 TG |
34 | link_enter_failed(link); |
35 | } | |
36 | ||
6cf4a01c | 37 | if (link->dhcp4_messages == 0) { |
3c9b8860 | 38 | link->dhcp4_configured = true; |
8012cd39 | 39 | link_check_ready(link); |
3c9b8860 TG |
40 | } |
41 | ||
42 | return 1; | |
43 | } | |
44 | ||
d6eac9bd DW |
45 | static int route_scope_from_address(const Route *route, const struct in_addr *self_addr) { |
46 | assert(route); | |
47 | assert(self_addr); | |
48 | ||
49 | if (in_addr_is_localhost(AF_INET, &route->dst) || | |
50 | (self_addr->s_addr && route->dst.in.s_addr == self_addr->s_addr)) | |
51 | return RT_SCOPE_HOST; | |
52 | else if (in4_addr_is_null(&route->gw.in)) | |
53 | return RT_SCOPE_LINK; | |
54 | else | |
55 | return RT_SCOPE_UNIVERSE; | |
56 | } | |
57 | ||
3c9b8860 | 58 | static int link_set_dhcp_routes(Link *link) { |
f8693fc7 | 59 | _cleanup_free_ sd_dhcp_route **static_routes = NULL; |
8cdc46e7 SS |
60 | bool classless_route = false, static_route = false; |
61 | struct in_addr gateway, address; | |
3c9b8860 | 62 | int r, n, i; |
fc1ba79d | 63 | uint32_t table; |
3c9b8860 TG |
64 | |
65 | assert(link); | |
0c9b15a3 AJ |
66 | |
67 | if (!link->dhcp_lease) /* link went down while we configured the IP addresses? */ | |
68 | return 0; | |
69 | ||
70 | if (!link->network) /* link went down while we configured the IP addresses? */ | |
71 | return 0; | |
964b26fe SS |
72 | |
73 | if (!link->network->dhcp_use_routes) | |
74 | return 0; | |
3c9b8860 | 75 | |
fc1ba79d AR |
76 | /* When the interface is part of an VRF use the VRFs routing table, unless |
77 | * there is a another table specified. */ | |
78 | table = link->network->dhcp_route_table; | |
79 | if (!link->network->dhcp_route_table_set && link->network->vrf != NULL) | |
80 | table = VRF(link->network->vrf)->table; | |
81 | ||
b23aec0d DW |
82 | r = sd_dhcp_lease_get_address(link->dhcp_lease, &address); |
83 | if (r < 0) | |
84 | return log_link_warning_errno(link, r, "DHCP error: could not get address: %m"); | |
85 | ||
5f04a209 | 86 | n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes); |
5f04a209 | 87 | if (n < 0) |
8dc787d1 | 88 | log_link_debug_errno(link, n, "DHCP error: could not get routes: %m"); |
5f04a209 | 89 | |
8cdc46e7 SS |
90 | for (i = 0; i < n; i++) { |
91 | if (static_routes[i]->option == SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE) | |
92 | classless_route = true; | |
93 | ||
94 | if (static_routes[i]->option == SD_DHCP_OPTION_STATIC_ROUTE) | |
95 | static_route = true; | |
96 | } | |
97 | ||
5f04a209 | 98 | for (i = 0; i < n; i++) { |
8e766630 | 99 | _cleanup_(route_freep) Route *route = NULL; |
5f04a209 | 100 | |
8cdc46e7 SS |
101 | /* if the DHCP server returns both a Classless Static Routes option and a Static Routes option, |
102 | the DHCP client MUST ignore the Static Routes option. */ | |
103 | if (classless_route && static_routes[i]->option == SD_DHCP_OPTION_STATIC_ROUTE) | |
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 SS |
127 | if (r == -ENODATA) |
128 | log_link_info_errno(link, r, "DHCP: No routes received from DHCP server: %m"); | |
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) { | |
8e766630 LP |
138 | _cleanup_(route_freep) Route *route = NULL; |
139 | _cleanup_(route_freep) Route *route_gw = NULL; | |
3c9b8860 | 140 | |
ed9e361a | 141 | r = route_new(&route); |
f6b8196f LP |
142 | if (r < 0) |
143 | return log_link_error_errno(link, r, "Could not allocate route: %m"); | |
3c9b8860 | 144 | |
ed9e361a TG |
145 | route->protocol = RTPROT_DHCP; |
146 | ||
147 | r = route_new(&route_gw); | |
f6b8196f LP |
148 | if (r < 0) |
149 | return log_link_error_errno(link, r, "Could not allocate route: %m"); | |
3c9b8860 TG |
150 | |
151 | /* The dhcp netmask may mask out the gateway. Add an explicit | |
152 | * route for the gw host so that we can route no matter the | |
153 | * netmask or existing kernel route tables. */ | |
154 | route_gw->family = AF_INET; | |
2ce40956 | 155 | route_gw->dst.in = gateway; |
3c9b8860 | 156 | route_gw->dst_prefixlen = 32; |
2ce40956 | 157 | route_gw->prefsrc.in = address; |
3c9b8860 | 158 | route_gw->scope = RT_SCOPE_LINK; |
ed9e361a | 159 | route_gw->protocol = RTPROT_DHCP; |
86655331 | 160 | route_gw->priority = link->network->dhcp_route_metric; |
fc1ba79d | 161 | route_gw->table = table; |
3c9b8860 | 162 | |
483d099e | 163 | r = route_configure(route_gw, link, dhcp4_route_handler); |
f6b8196f LP |
164 | if (r < 0) |
165 | return log_link_warning_errno(link, r, "Could not set host route: %m"); | |
3c9b8860 | 166 | |
313cefa1 | 167 | link->dhcp4_messages++; |
3c9b8860 TG |
168 | |
169 | route->family = AF_INET; | |
2ce40956 TG |
170 | route->gw.in = gateway; |
171 | route->prefsrc.in = address; | |
86655331 | 172 | route->priority = link->network->dhcp_route_metric; |
fc1ba79d | 173 | route->table = table; |
3c9b8860 | 174 | |
483d099e | 175 | r = route_configure(route, link, dhcp4_route_handler); |
3c9b8860 | 176 | if (r < 0) { |
f6b8196f | 177 | log_link_warning_errno(link, r, "Could not set routes: %m"); |
3c9b8860 TG |
178 | link_enter_failed(link); |
179 | return r; | |
180 | } | |
181 | ||
313cefa1 | 182 | link->dhcp4_messages++; |
3c9b8860 TG |
183 | } |
184 | ||
3c9b8860 TG |
185 | return 0; |
186 | } | |
187 | ||
188 | static int dhcp_lease_lost(Link *link) { | |
8e766630 | 189 | _cleanup_(address_freep) Address *address = NULL; |
3c9b8860 TG |
190 | struct in_addr addr; |
191 | struct in_addr netmask; | |
192 | struct in_addr gateway; | |
f414a269 | 193 | unsigned prefixlen = 0; |
3c9b8860 TG |
194 | int r; |
195 | ||
196 | assert(link); | |
197 | assert(link->dhcp_lease); | |
198 | ||
79008bdd | 199 | log_link_warning(link, "DHCP lease lost"); |
3c9b8860 | 200 | |
27cb34f5 | 201 | if (link->network->dhcp_use_routes) { |
f8693fc7 | 202 | _cleanup_free_ sd_dhcp_route **routes = NULL; |
3c9b8860 TG |
203 | int n, i; |
204 | ||
205 | n = sd_dhcp_lease_get_routes(link->dhcp_lease, &routes); | |
206 | if (n >= 0) { | |
207 | for (i = 0; i < n; i++) { | |
8e766630 | 208 | _cleanup_(route_freep) Route *route = NULL; |
3c9b8860 | 209 | |
ed9e361a | 210 | r = route_new(&route); |
3c9b8860 TG |
211 | if (r >= 0) { |
212 | route->family = AF_INET; | |
f8693fc7 BG |
213 | assert_se(sd_dhcp_route_get_gateway(routes[i], &route->gw.in) >= 0); |
214 | assert_se(sd_dhcp_route_get_destination(routes[i], &route->dst.in) >= 0); | |
215 | assert_se(sd_dhcp_route_get_destination_prefix_length(routes[i], &route->dst_prefixlen) >= 0); | |
3c9b8860 | 216 | |
91b5f997 | 217 | route_remove(route, link, |
483d099e | 218 | link_route_remove_handler); |
3c9b8860 TG |
219 | } |
220 | } | |
221 | } | |
222 | } | |
223 | ||
f0213e37 | 224 | r = address_new(&address); |
3c9b8860 TG |
225 | if (r >= 0) { |
226 | r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway); | |
227 | if (r >= 0) { | |
8e766630 LP |
228 | _cleanup_(route_freep) Route *route_gw = NULL; |
229 | _cleanup_(route_freep) Route *route = NULL; | |
3c9b8860 | 230 | |
ed9e361a | 231 | r = route_new(&route_gw); |
3c9b8860 TG |
232 | if (r >= 0) { |
233 | route_gw->family = AF_INET; | |
2ce40956 | 234 | route_gw->dst.in = gateway; |
3c9b8860 TG |
235 | route_gw->dst_prefixlen = 32; |
236 | route_gw->scope = RT_SCOPE_LINK; | |
237 | ||
91b5f997 | 238 | route_remove(route_gw, link, |
483d099e | 239 | link_route_remove_handler); |
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 | |
91b5f997 | 247 | route_remove(route, link, |
483d099e | 248 | link_route_remove_handler); |
3c9b8860 TG |
249 | } |
250 | } | |
251 | ||
f414a269 TG |
252 | r = sd_dhcp_lease_get_address(link->dhcp_lease, &addr); |
253 | if (r >= 0) { | |
254 | r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask); | |
255 | if (r >= 0) | |
5a941f5f | 256 | prefixlen = in4_addr_netmask_to_prefixlen(&netmask); |
3c9b8860 | 257 | |
f414a269 TG |
258 | address->family = AF_INET; |
259 | address->in_addr.in = addr; | |
260 | address->prefixlen = prefixlen; | |
3c9b8860 | 261 | |
483d099e | 262 | address_remove(address, link, link_address_remove_handler); |
f414a269 | 263 | } |
3c9b8860 TG |
264 | } |
265 | ||
27cb34f5 | 266 | if (link->network->dhcp_use_mtu) { |
3c9b8860 TG |
267 | uint16_t mtu; |
268 | ||
269 | r = sd_dhcp_lease_get_mtu(link->dhcp_lease, &mtu); | |
270 | if (r >= 0 && link->original_mtu != mtu) { | |
271 | r = link_set_mtu(link, link->original_mtu); | |
272 | if (r < 0) { | |
79008bdd | 273 | log_link_warning(link, |
3c9b8860 TG |
274 | "DHCP error: could not reset MTU"); |
275 | link_enter_failed(link); | |
276 | return r; | |
277 | } | |
278 | } | |
279 | } | |
280 | ||
27cb34f5 | 281 | if (link->network->dhcp_use_hostname) { |
3c9b8860 TG |
282 | const char *hostname = NULL; |
283 | ||
27cb34f5 LP |
284 | if (link->network->dhcp_hostname) |
285 | hostname = link->network->dhcp_hostname; | |
dce391e7 LP |
286 | else |
287 | (void) sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname); | |
a7d0ef44 | 288 | |
dce391e7 LP |
289 | if (hostname) { |
290 | /* If a hostname was set due to the lease, then unset it now. */ | |
59eb33e0 | 291 | r = manager_set_hostname(link->manager, NULL); |
3c9b8860 | 292 | if (r < 0) |
dce391e7 | 293 | log_link_warning_errno(link, r, "Failed to reset transient hostname: %m"); |
3c9b8860 TG |
294 | } |
295 | } | |
296 | ||
297 | link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease); | |
6a3e5f6a | 298 | link_dirty(link); |
3c9b8860 TG |
299 | link->dhcp4_configured = false; |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
1c4baffc | 304 | static int dhcp4_address_handler(sd_netlink *rtnl, sd_netlink_message *m, |
3c9b8860 | 305 | void *userdata) { |
8e766630 | 306 | _cleanup_(link_unrefp) Link *link = userdata; |
3c9b8860 TG |
307 | int r; |
308 | ||
309 | assert(link); | |
310 | ||
1c4baffc | 311 | r = sd_netlink_message_get_errno(m); |
3c9b8860 | 312 | if (r < 0 && r != -EEXIST) { |
f6b8196f | 313 | log_link_error_errno(link, r, "Could not set DHCPv4 address: %m"); |
3c9b8860 | 314 | link_enter_failed(link); |
45af44d4 | 315 | } else if (r >= 0) |
200a0868 | 316 | manager_rtnl_process_address(rtnl, m, link->manager); |
3c9b8860 TG |
317 | |
318 | link_set_dhcp_routes(link); | |
319 | ||
223932c7 AH |
320 | if (link->dhcp4_messages == 0) { |
321 | link->dhcp4_configured = true; | |
322 | link_check_ready(link); | |
323 | } | |
324 | ||
3c9b8860 TG |
325 | return 1; |
326 | } | |
327 | ||
328 | static int dhcp4_update_address(Link *link, | |
329 | struct in_addr *address, | |
330 | struct in_addr *netmask, | |
331 | uint32_t lifetime) { | |
8e766630 | 332 | _cleanup_(address_freep) Address *addr = NULL; |
3c9b8860 TG |
333 | unsigned prefixlen; |
334 | int r; | |
335 | ||
336 | assert(address); | |
337 | assert(netmask); | |
338 | assert(lifetime); | |
339 | ||
5a941f5f | 340 | prefixlen = in4_addr_netmask_to_prefixlen(netmask); |
3c9b8860 | 341 | |
f0213e37 | 342 | r = address_new(&addr); |
3c9b8860 TG |
343 | if (r < 0) |
344 | return r; | |
345 | ||
346 | addr->family = AF_INET; | |
347 | addr->in_addr.in.s_addr = address->s_addr; | |
348 | addr->cinfo.ifa_prefered = lifetime; | |
349 | addr->cinfo.ifa_valid = lifetime; | |
350 | addr->prefixlen = prefixlen; | |
351 | addr->broadcast.s_addr = address->s_addr | ~netmask->s_addr; | |
352 | ||
66669078 TG |
353 | /* allow reusing an existing address and simply update its lifetime |
354 | * in case it already exists */ | |
483d099e | 355 | r = address_configure(addr, link, dhcp4_address_handler, true); |
3c9b8860 TG |
356 | if (r < 0) |
357 | return r; | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
362 | static int dhcp_lease_renew(sd_dhcp_client *client, Link *link) { | |
363 | sd_dhcp_lease *lease; | |
364 | struct in_addr address; | |
365 | struct in_addr netmask; | |
366 | uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME; | |
367 | int r; | |
368 | ||
369 | assert(link); | |
370 | assert(client); | |
371 | assert(link->network); | |
372 | ||
373 | r = sd_dhcp_client_get_lease(client, &lease); | |
f6b8196f LP |
374 | if (r < 0) |
375 | return log_link_warning_errno(link, r, "DHCP error: no lease: %m"); | |
3c9b8860 TG |
376 | |
377 | sd_dhcp_lease_unref(link->dhcp_lease); | |
378 | link->dhcp4_configured = false; | |
e6b18ffa | 379 | link->dhcp_lease = sd_dhcp_lease_ref(lease); |
6a3e5f6a | 380 | link_dirty(link); |
3c9b8860 TG |
381 | |
382 | r = sd_dhcp_lease_get_address(lease, &address); | |
f6b8196f LP |
383 | if (r < 0) |
384 | return log_link_warning_errno(link, r, "DHCP error: no address: %m"); | |
3c9b8860 TG |
385 | |
386 | r = sd_dhcp_lease_get_netmask(lease, &netmask); | |
f6b8196f LP |
387 | if (r < 0) |
388 | return log_link_warning_errno(link, r, "DHCP error: no netmask: %m"); | |
3c9b8860 TG |
389 | |
390 | if (!link->network->dhcp_critical) { | |
f6b8196f LP |
391 | r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, &lifetime); |
392 | if (r < 0) | |
393 | return log_link_warning_errno(link, r, "DHCP error: no lifetime: %m"); | |
3c9b8860 TG |
394 | } |
395 | ||
396 | r = dhcp4_update_address(link, &address, &netmask, lifetime); | |
397 | if (r < 0) { | |
f6b8196f | 398 | log_link_warning_errno(link, r, "Could not update IP address: %m"); |
3c9b8860 TG |
399 | link_enter_failed(link); |
400 | return r; | |
401 | } | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
406 | static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) { | |
407 | sd_dhcp_lease *lease; | |
408 | struct in_addr address; | |
409 | struct in_addr netmask; | |
410 | struct in_addr gateway; | |
411 | unsigned prefixlen; | |
412 | uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME; | |
413 | int r; | |
414 | ||
415 | assert(client); | |
416 | assert(link); | |
417 | ||
418 | r = sd_dhcp_client_get_lease(client, &lease); | |
f2341e0a | 419 | if (r < 0) |
f6b8196f | 420 | return log_link_error_errno(link, r, "DHCP error: No lease: %m"); |
3c9b8860 TG |
421 | |
422 | r = sd_dhcp_lease_get_address(lease, &address); | |
f2341e0a | 423 | if (r < 0) |
f6b8196f | 424 | return log_link_error_errno(link, r, "DHCP error: No address: %m"); |
3c9b8860 TG |
425 | |
426 | r = sd_dhcp_lease_get_netmask(lease, &netmask); | |
f2341e0a | 427 | if (r < 0) |
f6b8196f | 428 | return log_link_error_errno(link, r, "DHCP error: No netmask: %m"); |
3c9b8860 | 429 | |
5a941f5f | 430 | prefixlen = in4_addr_netmask_to_prefixlen(&netmask); |
3c9b8860 TG |
431 | |
432 | r = sd_dhcp_lease_get_router(lease, &gateway); | |
397d15fd | 433 | if (r < 0 && r != -ENODATA) |
f6b8196f | 434 | return log_link_error_errno(link, r, "DHCP error: Could not get gateway: %m"); |
3c9b8860 TG |
435 | |
436 | if (r >= 0) | |
f2341e0a LP |
437 | log_struct(LOG_INFO, |
438 | LOG_LINK_INTERFACE(link), | |
439 | LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u", | |
440 | ADDRESS_FMT_VAL(address), | |
441 | prefixlen, | |
442 | ADDRESS_FMT_VAL(gateway)), | |
443 | "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address), | |
444 | "PREFIXLEN=%u", prefixlen, | |
a1230ff9 | 445 | "GATEWAY=%u.%u.%u.%u", ADDRESS_FMT_VAL(gateway)); |
3c9b8860 | 446 | else |
f2341e0a LP |
447 | log_struct(LOG_INFO, |
448 | LOG_LINK_INTERFACE(link), | |
449 | LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u", | |
450 | ADDRESS_FMT_VAL(address), | |
451 | prefixlen), | |
452 | "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address), | |
a1230ff9 | 453 | "PREFIXLEN=%u", prefixlen); |
3c9b8860 | 454 | |
e6b18ffa | 455 | link->dhcp_lease = sd_dhcp_lease_ref(lease); |
6a3e5f6a | 456 | link_dirty(link); |
3c9b8860 | 457 | |
27cb34f5 | 458 | if (link->network->dhcp_use_mtu) { |
3c9b8860 TG |
459 | uint16_t mtu; |
460 | ||
461 | r = sd_dhcp_lease_get_mtu(lease, &mtu); | |
462 | if (r >= 0) { | |
463 | r = link_set_mtu(link, mtu); | |
464 | if (r < 0) | |
f2341e0a | 465 | log_link_error_errno(link, r, "Failed to set MTU to %" PRIu16 ": %m", mtu); |
3c9b8860 TG |
466 | } |
467 | } | |
468 | ||
27cb34f5 | 469 | if (link->network->dhcp_use_hostname) { |
2de2abad LB |
470 | const char *dhcpname = NULL; |
471 | _cleanup_free_ char *hostname = NULL; | |
3c9b8860 | 472 | |
27cb34f5 | 473 | if (link->network->dhcp_hostname) |
2de2abad | 474 | dhcpname = link->network->dhcp_hostname; |
dce391e7 | 475 | else |
2de2abad LB |
476 | (void) sd_dhcp_lease_get_hostname(lease, &dhcpname); |
477 | ||
478 | if (dhcpname) { | |
479 | r = shorten_overlong(dhcpname, &hostname); | |
480 | if (r < 0) | |
481 | log_link_warning_errno(link, r, "Unable to shorten overlong DHCP hostname '%s', ignoring: %m", dhcpname); | |
482 | if (r == 1) | |
483 | log_link_notice(link, "Overlong DCHP hostname received, shortened from '%s' to '%s'", dhcpname, hostname); | |
484 | } | |
a7d0ef44 | 485 | |
dce391e7 | 486 | if (hostname) { |
59eb33e0 | 487 | r = manager_set_hostname(link->manager, hostname); |
3c9b8860 | 488 | if (r < 0) |
f2341e0a | 489 | log_link_error_errno(link, r, "Failed to set transient hostname to '%s': %m", hostname); |
3c9b8860 TG |
490 | } |
491 | } | |
492 | ||
27cb34f5 | 493 | if (link->network->dhcp_use_timezone) { |
21b80ad1 LP |
494 | const char *tz = NULL; |
495 | ||
496 | (void) sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz); | |
497 | ||
498 | if (tz) { | |
59eb33e0 | 499 | r = manager_set_timezone(link->manager, tz); |
21b80ad1 LP |
500 | if (r < 0) |
501 | log_link_error_errno(link, r, "Failed to set timezone to '%s': %m", tz); | |
502 | } | |
503 | } | |
504 | ||
3c9b8860 | 505 | if (!link->network->dhcp_critical) { |
f2341e0a | 506 | r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, &lifetime); |
3c9b8860 | 507 | if (r < 0) { |
f2341e0a | 508 | log_link_warning_errno(link, r, "DHCP error: no lifetime: %m"); |
3c9b8860 TG |
509 | return r; |
510 | } | |
511 | } | |
512 | ||
513 | r = dhcp4_update_address(link, &address, &netmask, lifetime); | |
514 | if (r < 0) { | |
f2341e0a | 515 | log_link_warning_errno(link, r, "Could not update IP address: %m"); |
3c9b8860 TG |
516 | link_enter_failed(link); |
517 | return r; | |
518 | } | |
519 | ||
520 | return 0; | |
521 | } | |
522 | static void dhcp4_handler(sd_dhcp_client *client, int event, void *userdata) { | |
523 | Link *link = userdata; | |
524 | int r = 0; | |
525 | ||
526 | assert(link); | |
527 | assert(link->network); | |
528 | assert(link->manager); | |
529 | ||
530 | if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) | |
531 | return; | |
532 | ||
533 | switch (event) { | |
03748142 DH |
534 | case SD_DHCP_CLIENT_EVENT_EXPIRED: |
535 | case SD_DHCP_CLIENT_EVENT_STOP: | |
536 | case SD_DHCP_CLIENT_EVENT_IP_CHANGE: | |
3c9b8860 | 537 | if (link->network->dhcp_critical) { |
f6b8196f | 538 | log_link_error(link, "DHCPv4 connection considered system critical, ignoring request to reconfigure it."); |
3c9b8860 TG |
539 | return; |
540 | } | |
541 | ||
542 | if (link->dhcp_lease) { | |
543 | r = dhcp_lease_lost(link); | |
544 | if (r < 0) { | |
545 | link_enter_failed(link); | |
546 | return; | |
547 | } | |
548 | } | |
549 | ||
03748142 | 550 | if (event == SD_DHCP_CLIENT_EVENT_IP_CHANGE) { |
3c9b8860 TG |
551 | r = dhcp_lease_acquired(client, link); |
552 | if (r < 0) { | |
553 | link_enter_failed(link); | |
554 | return; | |
555 | } | |
556 | } | |
557 | ||
558 | break; | |
03748142 | 559 | case SD_DHCP_CLIENT_EVENT_RENEW: |
3c9b8860 TG |
560 | r = dhcp_lease_renew(client, link); |
561 | if (r < 0) { | |
562 | link_enter_failed(link); | |
563 | return; | |
564 | } | |
565 | break; | |
03748142 | 566 | case SD_DHCP_CLIENT_EVENT_IP_ACQUIRE: |
3c9b8860 TG |
567 | r = dhcp_lease_acquired(client, link); |
568 | if (r < 0) { | |
569 | link_enter_failed(link); | |
570 | return; | |
571 | } | |
572 | break; | |
573 | default: | |
574 | if (event < 0) | |
f6b8196f | 575 | log_link_warning_errno(link, event, "DHCP error: Client failed: %m"); |
3c9b8860 | 576 | else |
f6b8196f | 577 | log_link_warning(link, "DHCP unknown event: %i", event); |
3c9b8860 TG |
578 | break; |
579 | } | |
580 | ||
581 | return; | |
582 | } | |
583 | ||
7192bb81 LP |
584 | static int dhcp4_set_hostname(Link *link) { |
585 | _cleanup_free_ char *hostname = NULL; | |
586 | const char *hn; | |
587 | int r; | |
588 | ||
589 | assert(link); | |
590 | ||
591 | if (!link->network->dhcp_send_hostname) | |
592 | hn = NULL; | |
593 | else if (link->network->dhcp_hostname) | |
594 | hn = link->network->dhcp_hostname; | |
595 | else { | |
596 | r = gethostname_strict(&hostname); | |
597 | if (r < 0 && r != -ENXIO) /* ENXIO: no hostname set or hostname is "localhost" */ | |
598 | return r; | |
599 | ||
600 | hn = hostname; | |
601 | } | |
602 | ||
603 | return sd_dhcp_client_set_hostname(link->dhcp_client, hn); | |
604 | } | |
605 | ||
64b21ece | 606 | static bool promote_secondaries_enabled(const char *ifname) { |
3f550c31 HV |
607 | _cleanup_free_ char *promote_secondaries_sysctl = NULL; |
608 | char *promote_secondaries_path; | |
64b21ece MV |
609 | int r; |
610 | ||
611 | promote_secondaries_path = strjoina("net/ipv4/conf/", ifname, "/promote_secondaries"); | |
612 | r = sysctl_read(promote_secondaries_path, &promote_secondaries_sysctl); | |
613 | if (r < 0) { | |
614 | log_debug_errno(r, "Cannot read sysctl %s", promote_secondaries_path); | |
615 | return false; | |
616 | } | |
617 | ||
618 | truncate_nl(promote_secondaries_sysctl); | |
619 | r = parse_boolean(promote_secondaries_sysctl); | |
620 | if (r < 0) | |
621 | log_warning_errno(r, "Cannot parse sysctl %s with content %s as boolean", promote_secondaries_path, promote_secondaries_sysctl); | |
622 | return r > 0; | |
623 | } | |
624 | ||
625 | /* dhcp4_set_promote_secondaries will ensure this interface has | |
626 | * the "promote_secondaries" option in the kernel set. If this sysctl | |
627 | * is not set DHCP will work only as long as the IP address does not | |
628 | * changes between leases. The kernel will remove all secondary IP | |
629 | * addresses of an interface otherwise. The way systemd-network works | |
630 | * is that the new IP of a lease is added as a secondary IP and when | |
631 | * the primary one expires it relies on the kernel to promote the | |
632 | * secondary IP. See also https://github.com/systemd/systemd/issues/7163 | |
633 | */ | |
634 | int dhcp4_set_promote_secondaries(Link *link) { | |
635 | int r; | |
636 | ||
637 | assert(link); | |
638 | assert(link->network); | |
639 | assert(link->network->dhcp & ADDRESS_FAMILY_IPV4); | |
640 | ||
641 | /* check if the kernel has promote_secondaries enabled for our | |
642 | * interface. If it is not globally enabled or enabled for the | |
643 | * specific interface we must either enable it. | |
644 | */ | |
8e1a7253 | 645 | if (!(promote_secondaries_enabled("all") || promote_secondaries_enabled(link->ifname))) { |
64b21ece MV |
646 | char *promote_secondaries_path = NULL; |
647 | ||
648 | log_link_debug(link, "promote_secondaries is unset, setting it"); | |
649 | promote_secondaries_path = strjoina("net/ipv4/conf/", link->ifname, "/promote_secondaries"); | |
650 | r = sysctl_write(promote_secondaries_path, "1"); | |
651 | if (r < 0) | |
652 | log_link_warning_errno(link, r, "cannot set sysctl %s to 1", promote_secondaries_path); | |
653 | return r > 0; | |
654 | } | |
655 | ||
656 | return 0; | |
657 | } | |
658 | ||
3c9b8860 TG |
659 | int dhcp4_configure(Link *link) { |
660 | int r; | |
661 | ||
662 | assert(link); | |
663 | assert(link->network); | |
e0ee46f2 | 664 | assert(link->network->dhcp & ADDRESS_FAMILY_IPV4); |
3c9b8860 | 665 | |
0bc70f1d | 666 | if (!link->dhcp_client) { |
db3d2358 | 667 | r = sd_dhcp_client_new(&link->dhcp_client, link->network->dhcp_anonymize); |
0bc70f1d TG |
668 | if (r < 0) |
669 | return r; | |
670 | } | |
3c9b8860 TG |
671 | |
672 | r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0); | |
673 | if (r < 0) | |
674 | return r; | |
675 | ||
76253e73 DW |
676 | r = sd_dhcp_client_set_mac(link->dhcp_client, |
677 | (const uint8_t *) &link->mac, | |
678 | sizeof (link->mac), ARPHRD_ETHER); | |
3c9b8860 TG |
679 | if (r < 0) |
680 | return r; | |
681 | ||
2f8e7633 | 682 | r = sd_dhcp_client_set_ifindex(link->dhcp_client, link->ifindex); |
3c9b8860 TG |
683 | if (r < 0) |
684 | return r; | |
685 | ||
686 | r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp4_handler, link); | |
687 | if (r < 0) | |
688 | return r; | |
689 | ||
690 | r = sd_dhcp_client_set_request_broadcast(link->dhcp_client, | |
691 | link->network->dhcp_broadcast); | |
692 | if (r < 0) | |
693 | return r; | |
694 | ||
695 | if (link->mtu) { | |
696 | r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu); | |
697 | if (r < 0) | |
698 | return r; | |
699 | } | |
700 | ||
27cb34f5 | 701 | if (link->network->dhcp_use_mtu) { |
39745a5a | 702 | r = sd_dhcp_client_set_request_option(link->dhcp_client, |
22805d92 | 703 | SD_DHCP_OPTION_INTERFACE_MTU); |
39745a5a LP |
704 | if (r < 0) |
705 | return r; | |
3c9b8860 TG |
706 | } |
707 | ||
5e77a146 | 708 | /* NOTE: even if this variable is called "use", it also "sends" PRL |
709 | * options, maybe there should be a different configuration variable | |
710 | * to send or not route options?. */ | |
28522b0d | 711 | /* NOTE: when using Anonymize=yes, routes PRL options are sent |
712 | * by default, so they don't need to be added here. */ | |
5e77a146 | 713 | if (link->network->dhcp_use_routes && !link->network->dhcp_anonymize) { |
3c9b8860 | 714 | r = sd_dhcp_client_set_request_option(link->dhcp_client, |
22805d92 | 715 | SD_DHCP_OPTION_STATIC_ROUTE); |
3c9b8860 TG |
716 | if (r < 0) |
717 | return r; | |
718 | r = sd_dhcp_client_set_request_option(link->dhcp_client, | |
22805d92 | 719 | SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE); |
7d6884b6 TA |
720 | if (r < 0) |
721 | return r; | |
3c9b8860 TG |
722 | } |
723 | ||
ead36ce6 | 724 | if (link->network->dhcp_use_ntp) { |
725 | r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NTP_SERVER); | |
726 | if (r < 0) | |
727 | return r; | |
728 | } | |
4b7b5abb | 729 | |
89573b37 | 730 | if (link->network->dhcp_use_timezone) { |
731 | r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NEW_TZDB_TIMEZONE); | |
732 | if (r < 0) | |
733 | return r; | |
734 | } | |
8eb9058d | 735 | |
7192bb81 LP |
736 | r = dhcp4_set_hostname(link); |
737 | if (r < 0) | |
738 | return r; | |
3c9b8860 TG |
739 | |
740 | if (link->network->dhcp_vendor_class_identifier) { | |
741 | r = sd_dhcp_client_set_vendor_class_identifier(link->dhcp_client, | |
742 | link->network->dhcp_vendor_class_identifier); | |
743 | if (r < 0) | |
744 | return r; | |
745 | } | |
746 | ||
af1c0de0 SS |
747 | if (link->network->dhcp_user_class) { |
748 | r = sd_dhcp_client_set_user_class(link->dhcp_client, (const char **) link->network->dhcp_user_class); | |
749 | if (r < 0) | |
750 | return r; | |
751 | } | |
752 | ||
9faed222 SS |
753 | if (link->network->dhcp_client_port) { |
754 | r = sd_dhcp_client_set_client_port(link->dhcp_client, link->network->dhcp_client_port); | |
755 | if (r < 0) | |
756 | return r; | |
757 | } | |
758 | ||
3e43b2cd | 759 | switch (link->network->dhcp_client_identifier) { |
8341a5c3 | 760 | case DHCP_CLIENT_ID_DUID: { |
413708d1 | 761 | /* If configured, apply user specified DUID and/or IAID */ |
8341a5c3 ZJS |
762 | const DUID *duid = link_duid(link); |
763 | ||
764 | r = sd_dhcp_client_set_iaid_duid(link->dhcp_client, | |
765 | link->network->iaid, | |
766 | duid->type, | |
767 | duid->raw_data_len > 0 ? duid->raw_data : NULL, | |
768 | duid->raw_data_len); | |
413708d1 VK |
769 | if (r < 0) |
770 | return r; | |
3e43b2cd | 771 | break; |
8341a5c3 | 772 | } |
dace710c YW |
773 | case DHCP_CLIENT_ID_DUID_ONLY: { |
774 | /* If configured, apply user specified DUID */ | |
775 | const DUID *duid = link_duid(link); | |
776 | ||
777 | r = sd_dhcp_client_set_duid(link->dhcp_client, | |
778 | duid->type, | |
779 | duid->raw_data_len > 0 ? duid->raw_data : NULL, | |
780 | duid->raw_data_len); | |
781 | if (r < 0) | |
782 | return r; | |
783 | break; | |
784 | } | |
3e43b2cd JJ |
785 | case DHCP_CLIENT_ID_MAC: |
786 | r = sd_dhcp_client_set_client_id(link->dhcp_client, | |
787 | ARPHRD_ETHER, | |
788 | (const uint8_t *) &link->mac, | |
8341a5c3 | 789 | sizeof(link->mac)); |
3e43b2cd JJ |
790 | if (r < 0) |
791 | return r; | |
792 | break; | |
793 | default: | |
794 | assert_not_reached("Unknown client identifier type."); | |
795 | } | |
796 | ||
3c9b8860 TG |
797 | return 0; |
798 | } |