Branch data Line data Source code
1 : : /* SPDX-License-Identifier: LGPL-2.1+ */
2 : :
3 : : #include <netinet/in.h>
4 : : #include <linux/if.h>
5 : : #include <linux/if_arp.h>
6 : :
7 : : #include "alloc-util.h"
8 : : #include "hostname-util.h"
9 : : #include "parse-util.h"
10 : : #include "network-internal.h"
11 : : #include "networkd-dhcp4.h"
12 : : #include "networkd-link.h"
13 : : #include "networkd-manager.h"
14 : : #include "networkd-network.h"
15 : : #include "string-table.h"
16 : : #include "string-util.h"
17 : : #include "sysctl-util.h"
18 : :
19 : : static int dhcp_remove_routes(Link *link, sd_dhcp_lease *lease, const struct in_addr *address, bool remove_all);
20 : : static int dhcp_remove_router(Link *link, sd_dhcp_lease *lease, const struct in_addr *address, bool remove_all);
21 : : static int dhcp_remove_dns_routes(Link *link, sd_dhcp_lease *lease, const struct in_addr *address, bool remove_all);
22 : : static int dhcp_remove_address(Link *link, sd_dhcp_lease *lease, const struct in_addr *address);
23 : :
24 : 28 : void dhcp4_release_old_lease(Link *link) {
25 : 28 : struct in_addr address = {}, address_old = {};
26 : :
27 [ - + ]: 28 : assert(link);
28 : :
29 [ + - ]: 28 : if (!link->dhcp_lease_old)
30 : 28 : return;
31 : :
32 [ # # ]: 0 : assert(link->dhcp_lease);
33 : :
34 : 0 : (void) sd_dhcp_lease_get_address(link->dhcp_lease_old, &address_old);
35 : 0 : (void) sd_dhcp_lease_get_address(link->dhcp_lease, &address);
36 : :
37 : 0 : (void) dhcp_remove_routes(link, link->dhcp_lease_old, &address_old, false);
38 : 0 : (void) dhcp_remove_router(link, link->dhcp_lease_old, &address_old, false);
39 : 0 : (void) dhcp_remove_dns_routes(link, link->dhcp_lease_old, &address_old, false);
40 : :
41 [ # # ]: 0 : if (!in4_addr_equal(&address_old, &address))
42 : 0 : (void) dhcp_remove_address(link, link->dhcp_lease_old, &address_old);
43 : :
44 : 0 : link->dhcp_lease_old = sd_dhcp_lease_unref(link->dhcp_lease_old);
45 : 0 : link_dirty(link);
46 : : }
47 : :
48 : 0 : static int dhcp4_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
49 : : int r;
50 : :
51 [ # # ]: 0 : assert(link);
52 [ # # ]: 0 : assert(link->dhcp4_messages > 0);
53 : :
54 : 0 : link->dhcp4_messages--;
55 : :
56 [ # # # # ]: 0 : if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
57 : 0 : return 1;
58 : :
59 : 0 : r = sd_netlink_message_get_errno(m);
60 [ # # # # ]: 0 : if (r < 0 && r != -EEXIST) {
61 [ # # # # ]: 0 : log_link_error_errno(link, r, "Could not set DHCPv4 route: %m");
62 : 0 : link_enter_failed(link);
63 : 0 : return 1;
64 : : }
65 : :
66 [ # # ]: 0 : if (link->dhcp4_messages == 0) {
67 : 0 : link->dhcp4_configured = true;
68 : : /* New address and routes are configured now. Let's release old lease. */
69 : 0 : dhcp4_release_old_lease(link);
70 : 0 : link_check_ready(link);
71 : : }
72 : :
73 : 0 : return 1;
74 : : }
75 : :
76 : 0 : static int route_scope_from_address(const Route *route, const struct in_addr *self_addr) {
77 [ # # ]: 0 : assert(route);
78 [ # # ]: 0 : assert(self_addr);
79 : :
80 [ # # ]: 0 : if (in4_addr_is_localhost(&route->dst.in) ||
81 [ # # # # ]: 0 : (!in4_addr_is_null(self_addr) && in4_addr_equal(&route->dst.in, self_addr)))
82 : 0 : return RT_SCOPE_HOST;
83 [ # # ]: 0 : else if (in4_addr_is_null(&route->gw.in))
84 : 0 : return RT_SCOPE_LINK;
85 : : else
86 : 0 : return RT_SCOPE_UNIVERSE;
87 : : }
88 : :
89 : 0 : static int dhcp_route_configure(Route **route, Link *link) {
90 : : int r;
91 : :
92 [ # # ]: 0 : assert(route);
93 [ # # ]: 0 : assert(*route);
94 [ # # ]: 0 : assert(link);
95 : :
96 [ # # ]: 0 : if (set_contains(link->dhcp_routes, *route))
97 : 0 : return 0;
98 : :
99 : 0 : r = route_configure(*route, link, dhcp4_route_handler);
100 [ # # ]: 0 : if (r <= 0)
101 : 0 : return r;
102 : :
103 : 0 : link->dhcp4_messages++;
104 : :
105 : 0 : r = set_put(link->dhcp_routes, *route);
106 [ # # ]: 0 : if (r < 0)
107 : 0 : return r;
108 : :
109 : 0 : TAKE_PTR(*route);
110 : 0 : return 0;
111 : : }
112 : :
113 : 0 : static int link_set_dns_routes(Link *link, const struct in_addr *address) {
114 : : const struct in_addr *dns;
115 : : uint32_t table;
116 : : int i, n, r;
117 : :
118 [ # # ]: 0 : assert(link);
119 [ # # ]: 0 : assert(link->dhcp_lease);
120 [ # # ]: 0 : assert(link->network);
121 : :
122 [ # # ]: 0 : if (!link->network->dhcp_use_dns ||
123 [ # # ]: 0 : !link->network->dhcp_routes_to_dns)
124 : 0 : return 0;
125 : :
126 : 0 : n = sd_dhcp_lease_get_dns(link->dhcp_lease, &dns);
127 [ # # # # ]: 0 : if (IN_SET(n, 0, -ENODATA))
128 : 0 : return 0;
129 [ # # ]: 0 : if (n < 0)
130 [ # # # # ]: 0 : return log_link_warning_errno(link, n, "DHCP error: could not get DNS servers: %m");
131 : :
132 : 0 : table = link_get_dhcp_route_table(link);
133 : :
134 [ # # ]: 0 : for (i = 0; i < n; i ++) {
135 [ # # ]: 0 : _cleanup_(route_freep) Route *route = NULL;
136 : :
137 : 0 : r = route_new(&route);
138 [ # # ]: 0 : if (r < 0)
139 [ # # # # ]: 0 : return log_link_error_errno(link, r, "Could not allocate route: %m");
140 : :
141 : : /* Set routes to DNS servers. */
142 : :
143 : 0 : route->family = AF_INET;
144 : 0 : route->dst.in = dns[i];
145 : 0 : route->dst_prefixlen = 32;
146 : 0 : route->prefsrc.in = *address;
147 : 0 : route->scope = RT_SCOPE_LINK;
148 : 0 : route->protocol = RTPROT_DHCP;
149 : 0 : route->priority = link->network->dhcp_route_metric;
150 : 0 : route->table = table;
151 : :
152 : 0 : r = dhcp_route_configure(&route, link);
153 [ # # ]: 0 : if (r < 0)
154 [ # # # # ]: 0 : return log_link_error_errno(link, r, "Could not set route to DNS server: %m");
155 : : }
156 : :
157 : 0 : return 0;
158 : : }
159 : :
160 : 0 : static int link_set_dhcp_routes(Link *link) {
161 : 0 : _cleanup_free_ sd_dhcp_route **static_routes = NULL;
162 : 0 : bool classless_route = false, static_route = false;
163 : : const struct in_addr *router;
164 : : struct in_addr address;
165 : : int r, n, i;
166 : : uint32_t table;
167 : :
168 [ # # ]: 0 : assert(link);
169 : :
170 [ # # ]: 0 : if (!link->dhcp_lease) /* link went down while we configured the IP addresses? */
171 : 0 : return 0;
172 : :
173 [ # # ]: 0 : if (!link->network) /* link went down while we configured the IP addresses? */
174 : 0 : return 0;
175 : :
176 [ # # ]: 0 : if (!link->network->dhcp_use_routes)
177 : 0 : return 0;
178 : :
179 [ # # # # ]: 0 : if (!link_has_carrier(link) && !link->network->configure_without_carrier)
180 : : /* During configuring addresses, the link lost its carrier. As networkd is dropping
181 : : * the addresses now, let's not configure the routes either. */
182 : 0 : return 0;
183 : :
184 : 0 : r = set_ensure_allocated(&link->dhcp_routes, &route_full_hash_ops);
185 [ # # ]: 0 : if (r < 0)
186 : 0 : return log_oom();
187 : :
188 : : /* Clear old entries in case the set was already allocated */
189 : 0 : set_clear(link->dhcp_routes);
190 : :
191 : 0 : table = link_get_dhcp_route_table(link);
192 : :
193 : 0 : r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
194 [ # # ]: 0 : if (r < 0)
195 [ # # # # ]: 0 : return log_link_warning_errno(link, r, "DHCP error: could not get address: %m");
196 : :
197 : 0 : n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes);
198 [ # # ]: 0 : if (n == -ENODATA)
199 [ # # # # ]: 0 : log_link_debug_errno(link, n, "DHCP: No routes received from DHCP server: %m");
200 [ # # ]: 0 : else if (n < 0)
201 [ # # # # ]: 0 : log_link_debug_errno(link, n, "DHCP error: could not get routes: %m");
202 : :
203 [ # # ]: 0 : for (i = 0; i < n; i++) {
204 [ # # # ]: 0 : switch (sd_dhcp_route_get_option(static_routes[i])) {
205 : 0 : case SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE:
206 : 0 : classless_route = true;
207 : 0 : break;
208 : 0 : case SD_DHCP_OPTION_STATIC_ROUTE:
209 : 0 : static_route = true;
210 : 0 : break;
211 : : }
212 : 0 : }
213 : :
214 [ # # ]: 0 : for (i = 0; i < n; i++) {
215 [ # # # ]: 0 : _cleanup_(route_freep) Route *route = NULL;
216 : :
217 : : /* if the DHCP server returns both a Classless Static Routes option and a Static Routes option,
218 : : the DHCP client MUST ignore the Static Routes option. */
219 [ # # # # ]: 0 : if (classless_route &&
220 : 0 : sd_dhcp_route_get_option(static_routes[i]) != SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE)
221 : 0 : continue;
222 : :
223 : 0 : r = route_new(&route);
224 [ # # ]: 0 : if (r < 0)
225 [ # # # # ]: 0 : return log_link_error_errno(link, r, "Could not allocate route: %m");
226 : :
227 : 0 : route->family = AF_INET;
228 : 0 : route->protocol = RTPROT_DHCP;
229 [ # # ]: 0 : assert_se(sd_dhcp_route_get_gateway(static_routes[i], &route->gw.in) >= 0);
230 [ # # ]: 0 : assert_se(sd_dhcp_route_get_destination(static_routes[i], &route->dst.in) >= 0);
231 [ # # ]: 0 : assert_se(sd_dhcp_route_get_destination_prefix_length(static_routes[i], &route->dst_prefixlen) >= 0);
232 : 0 : route->priority = link->network->dhcp_route_metric;
233 : 0 : route->table = table;
234 : 0 : route->scope = route_scope_from_address(route, &address);
235 [ # # # # ]: 0 : if (IN_SET(route->scope, RT_SCOPE_LINK, RT_SCOPE_UNIVERSE))
236 : 0 : route->prefsrc.in = address;
237 : :
238 [ # # ]: 0 : if (set_contains(link->dhcp_routes, route))
239 : 0 : continue;
240 : :
241 : 0 : r = dhcp_route_configure(&route, link);
242 [ # # ]: 0 : if (r < 0)
243 [ # # # # ]: 0 : return log_link_error_errno(link, r, "Could not set route: %m");
244 : : }
245 : :
246 : 0 : r = sd_dhcp_lease_get_router(link->dhcp_lease, &router);
247 [ # # # # ]: 0 : if (IN_SET(r, 0, -ENODATA))
248 [ # # # # ]: 0 : log_link_info(link, "DHCP: No gateway received from DHCP server.");
249 [ # # ]: 0 : else if (r < 0)
250 [ # # # # ]: 0 : log_link_warning_errno(link, r, "DHCP error: could not get gateway: %m");
251 [ # # ]: 0 : else if (in4_addr_is_null(&router[0]))
252 [ # # # # ]: 0 : log_link_info(link, "DHCP: Received gateway is null.");
253 : :
254 : : /* According to RFC 3442: If the DHCP server returns both a Classless Static Routes option and
255 : : a Router option, the DHCP client MUST ignore the Router option. */
256 [ # # # # ]: 0 : if (classless_route && static_route)
257 [ # # # # ]: 0 : log_link_warning(link, "Classless static routes received from DHCP server: ignoring static-route option and router option");
258 : :
259 [ # # # # : 0 : if (r > 0 && !classless_route && !in4_addr_is_null(&router[0])) {
# # ]
260 [ # # # # ]: 0 : _cleanup_(route_freep) Route *route = NULL, *route_gw = NULL;
261 : :
262 : 0 : r = route_new(&route_gw);
263 [ # # ]: 0 : if (r < 0)
264 [ # # # # ]: 0 : return log_link_error_errno(link, r, "Could not allocate route: %m");
265 : :
266 : : /* The dhcp netmask may mask out the gateway. Add an explicit
267 : : * route for the gw host so that we can route no matter the
268 : : * netmask or existing kernel route tables. */
269 : 0 : route_gw->family = AF_INET;
270 : 0 : route_gw->dst.in = router[0];
271 : 0 : route_gw->dst_prefixlen = 32;
272 : 0 : route_gw->prefsrc.in = address;
273 : 0 : route_gw->scope = RT_SCOPE_LINK;
274 : 0 : route_gw->protocol = RTPROT_DHCP;
275 : 0 : route_gw->priority = link->network->dhcp_route_metric;
276 : 0 : route_gw->table = table;
277 : :
278 : 0 : r = dhcp_route_configure(&route_gw, link);
279 [ # # ]: 0 : if (r < 0)
280 [ # # # # ]: 0 : return log_link_error_errno(link, r, "Could not set host route: %m");
281 : :
282 : 0 : r = route_new(&route);
283 [ # # ]: 0 : if (r < 0)
284 [ # # # # ]: 0 : return log_link_error_errno(link, r, "Could not allocate route: %m");
285 : :
286 : 0 : route->family = AF_INET;
287 : 0 : route->gw.in = router[0];
288 : 0 : route->prefsrc.in = address;
289 : 0 : route->protocol = RTPROT_DHCP;
290 : 0 : route->priority = link->network->dhcp_route_metric;
291 : 0 : route->table = table;
292 : :
293 : 0 : r = dhcp_route_configure(&route, link);
294 [ # # ]: 0 : if (r < 0)
295 [ # # # # ]: 0 : return log_link_error_errno(link, r, "Could not set router: %m");
296 : : }
297 : :
298 : 0 : return link_set_dns_routes(link, &address);
299 : : }
300 : :
301 : 0 : static int dhcp_remove_routes(Link *link, sd_dhcp_lease *lease, const struct in_addr *address, bool remove_all) {
302 : 0 : _cleanup_free_ sd_dhcp_route **routes = NULL;
303 : : uint32_t table;
304 : : int n, i, r;
305 : :
306 [ # # ]: 0 : assert(link);
307 [ # # ]: 0 : assert(address);
308 : :
309 [ # # ]: 0 : if (!link->network->dhcp_use_routes)
310 : 0 : return 0;
311 : :
312 : 0 : n = sd_dhcp_lease_get_routes(lease, &routes);
313 [ # # # # ]: 0 : if (IN_SET(n, 0, -ENODATA))
314 : 0 : return 0;
315 [ # # ]: 0 : else if (n < 0)
316 [ # # # # ]: 0 : return log_link_error_errno(link, n, "DHCP error: Failed to get routes: %m");
317 : :
318 : 0 : table = link_get_dhcp_route_table(link);
319 : :
320 [ # # ]: 0 : for (i = 0; i < n; i++) {
321 [ # # # ]: 0 : _cleanup_(route_freep) Route *route = NULL;
322 : :
323 : 0 : r = route_new(&route);
324 [ # # ]: 0 : if (r < 0)
325 : 0 : return log_oom();
326 : :
327 : 0 : route->family = AF_INET;
328 [ # # ]: 0 : assert_se(sd_dhcp_route_get_gateway(routes[i], &route->gw.in) >= 0);
329 [ # # ]: 0 : assert_se(sd_dhcp_route_get_destination(routes[i], &route->dst.in) >= 0);
330 [ # # ]: 0 : assert_se(sd_dhcp_route_get_destination_prefix_length(routes[i], &route->dst_prefixlen) >= 0);
331 : 0 : route->priority = link->network->dhcp_route_metric;
332 : 0 : route->table = table;
333 : 0 : route->scope = route_scope_from_address(route, address);
334 [ # # # # ]: 0 : if (IN_SET(route->scope, RT_SCOPE_LINK, RT_SCOPE_UNIVERSE))
335 : 0 : route->prefsrc.in = *address;
336 : :
337 [ # # # # ]: 0 : if (!remove_all && set_contains(link->dhcp_routes, route))
338 : 0 : continue;
339 : :
340 : 0 : (void) route_remove(route, link, NULL);
341 : : }
342 : :
343 : 0 : return n;
344 : : }
345 : :
346 : 0 : static int dhcp_remove_router(Link *link, sd_dhcp_lease *lease, const struct in_addr *address, bool remove_all) {
347 : 0 : _cleanup_(route_freep) Route *route_gw = NULL, *route = NULL;
348 : : const struct in_addr *router;
349 : : uint32_t table;
350 : : int r;
351 : :
352 [ # # ]: 0 : assert(link);
353 [ # # ]: 0 : assert(address);
354 : :
355 [ # # ]: 0 : if (!link->network->dhcp_use_routes)
356 : 0 : return 0;
357 : :
358 : 0 : r = sd_dhcp_lease_get_router(lease, &router);
359 [ # # # # ]: 0 : if (IN_SET(r, 0, -ENODATA)) {
360 [ # # # # ]: 0 : log_link_debug(link, "DHCP: No gateway received from DHCP server.");
361 : 0 : return 0;
362 [ # # ]: 0 : } else if (r < 0)
363 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP error: could not get gateway: %m");
364 [ # # ]: 0 : else if (in4_addr_is_null(&router[0])) {
365 [ # # # # ]: 0 : log_link_info(link, "DHCP: Received gateway is null, ignoring.");
366 : 0 : return 0;
367 : : }
368 : :
369 : 0 : table = link_get_dhcp_route_table(link);
370 : :
371 : 0 : r = route_new(&route_gw);
372 [ # # ]: 0 : if (r < 0)
373 : 0 : return log_oom();
374 : :
375 : 0 : route_gw->family = AF_INET;
376 : 0 : route_gw->dst.in = router[0];
377 : 0 : route_gw->dst_prefixlen = 32;
378 : 0 : route_gw->prefsrc.in = *address;
379 : 0 : route_gw->scope = RT_SCOPE_LINK;
380 : 0 : route_gw->protocol = RTPROT_DHCP;
381 : 0 : route_gw->priority = link->network->dhcp_route_metric;
382 : 0 : route_gw->table = table;
383 : :
384 [ # # # # ]: 0 : if (remove_all || !set_contains(link->dhcp_routes, route_gw))
385 : 0 : (void) route_remove(route_gw, link, NULL);
386 : :
387 : 0 : r = route_new(&route);
388 [ # # ]: 0 : if (r < 0)
389 : 0 : return log_oom();
390 : :
391 : 0 : route->family = AF_INET;
392 : 0 : route->gw.in = router[0];
393 : 0 : route->prefsrc.in = *address;
394 : 0 : route->protocol = RTPROT_DHCP;
395 : 0 : route->priority = link->network->dhcp_route_metric;
396 : 0 : route->table = table;
397 : :
398 [ # # # # ]: 0 : if (remove_all || !set_contains(link->dhcp_routes, route))
399 : 0 : (void) route_remove(route, link, NULL);
400 : :
401 : 0 : return 0;
402 : : }
403 : :
404 : 0 : static int dhcp_remove_dns_routes(Link *link, sd_dhcp_lease *lease, const struct in_addr *address, bool remove_all) {
405 : : const struct in_addr *dns;
406 : : uint32_t table;
407 : : int i, n, r;
408 : :
409 [ # # ]: 0 : assert(link);
410 [ # # ]: 0 : assert(lease);
411 [ # # ]: 0 : assert(link->network);
412 : :
413 [ # # ]: 0 : if (!link->network->dhcp_use_dns ||
414 [ # # ]: 0 : !link->network->dhcp_routes_to_dns)
415 : 0 : return 0;
416 : :
417 : 0 : n = sd_dhcp_lease_get_dns(lease, &dns);
418 [ # # # # ]: 0 : if (IN_SET(n, 0, -ENODATA))
419 : 0 : return 0;
420 [ # # ]: 0 : if (n < 0)
421 [ # # # # ]: 0 : return log_link_warning_errno(link, n, "DHCP error: could not get DNS servers: %m");
422 : :
423 : 0 : table = link_get_dhcp_route_table(link);
424 : :
425 [ # # ]: 0 : for (i = 0; i < n; i ++) {
426 [ # # # ]: 0 : _cleanup_(route_freep) Route *route = NULL;
427 : :
428 : 0 : r = route_new(&route);
429 [ # # ]: 0 : if (r < 0)
430 [ # # # # ]: 0 : return log_link_error_errno(link, r, "Could not allocate route: %m");
431 : :
432 : 0 : route->family = AF_INET;
433 : 0 : route->dst.in = dns[i];
434 : 0 : route->dst_prefixlen = 32;
435 : 0 : route->prefsrc.in = *address;
436 : 0 : route->scope = RT_SCOPE_LINK;
437 : 0 : route->protocol = RTPROT_DHCP;
438 : 0 : route->priority = link->network->dhcp_route_metric;
439 : 0 : route->table = table;
440 : :
441 [ # # # # ]: 0 : if (!remove_all && set_contains(link->dhcp_routes, route))
442 : 0 : continue;
443 : :
444 : 0 : (void) route_remove(route, link, NULL);
445 : : }
446 : :
447 : 0 : return 0;
448 : : }
449 : :
450 : 0 : static int dhcp_remove_address(Link *link, sd_dhcp_lease *lease, const struct in_addr *address) {
451 : 0 : _cleanup_(address_freep) Address *a = NULL;
452 : : struct in_addr netmask;
453 : : int r;
454 : :
455 [ # # ]: 0 : assert(link);
456 [ # # ]: 0 : assert(address);
457 : :
458 [ # # ]: 0 : if (in4_addr_is_null(address))
459 : 0 : return 0;
460 : :
461 : 0 : r = address_new(&a);
462 [ # # ]: 0 : if (r < 0)
463 : 0 : return log_oom();
464 : :
465 : 0 : a->family = AF_INET;
466 : 0 : a->in_addr.in = *address;
467 : :
468 [ # # ]: 0 : if (sd_dhcp_lease_get_netmask(lease, &netmask) >= 0)
469 : 0 : a->prefixlen = in4_addr_netmask_to_prefixlen(&netmask);
470 : :
471 : 0 : (void) address_remove(a, link, NULL);
472 : :
473 : 0 : return 0;
474 : : }
475 : :
476 : 0 : static int dhcp_reset_mtu(Link *link) {
477 : : uint16_t mtu;
478 : : int r;
479 : :
480 [ # # ]: 0 : assert(link);
481 : :
482 [ # # ]: 0 : if (!link->network->dhcp_use_mtu)
483 : 0 : return 0;
484 : :
485 : 0 : r = sd_dhcp_lease_get_mtu(link->dhcp_lease, &mtu);
486 [ # # ]: 0 : if (r < 0)
487 : 0 : return r;
488 : :
489 [ # # ]: 0 : if (link->original_mtu == mtu)
490 : 0 : return 0;
491 : :
492 : 0 : r = link_set_mtu(link, link->original_mtu);
493 [ # # ]: 0 : if (r < 0) {
494 [ # # # # ]: 0 : log_link_error_errno(link, r, "DHCP error: could not reset MTU: %m");
495 : 0 : link_enter_failed(link);
496 : 0 : return r;
497 : : }
498 : :
499 : 0 : return 0;
500 : : }
501 : :
502 : 0 : static int dhcp_reset_hostname(Link *link) {
503 : : const char *hostname;
504 : : int r;
505 : :
506 [ # # ]: 0 : assert(link);
507 : :
508 [ # # ]: 0 : if (!link->network->dhcp_use_hostname)
509 : 0 : return 0;
510 : :
511 : 0 : hostname = link->network->dhcp_hostname;
512 [ # # ]: 0 : if (!hostname)
513 : 0 : (void) sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname);
514 : :
515 [ # # ]: 0 : if (!hostname)
516 : 0 : return 0;
517 : :
518 : : /* If a hostname was set due to the lease, then unset it now. */
519 : 0 : r = manager_set_hostname(link->manager, NULL);
520 [ # # ]: 0 : if (r < 0)
521 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP error: Failed to reset transient hostname: %m");
522 : :
523 : 0 : return 0;
524 : : }
525 : :
526 : 0 : static int dhcp_lease_lost(Link *link) {
527 : 0 : struct in_addr address = {};
528 : :
529 [ # # ]: 0 : assert(link);
530 [ # # ]: 0 : assert(link->dhcp_lease);
531 : :
532 [ # # # # ]: 0 : log_link_warning(link, "DHCP lease lost");
533 : :
534 : 0 : link->dhcp4_configured = false;
535 : :
536 : 0 : (void) sd_dhcp_lease_get_address(link->dhcp_lease, &address);
537 : 0 : (void) dhcp_remove_routes(link, link->dhcp_lease, &address, true);
538 : 0 : (void) dhcp_remove_router(link, link->dhcp_lease, &address, true);
539 : 0 : (void) dhcp_remove_dns_routes(link, link->dhcp_lease, &address, true);
540 : 0 : (void) dhcp_remove_address(link, link->dhcp_lease, &address);
541 : 0 : (void) dhcp_reset_mtu(link);
542 : 0 : (void) dhcp_reset_hostname(link);
543 : :
544 : 0 : link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
545 : 0 : link_dirty(link);
546 : :
547 : 0 : return 0;
548 : : }
549 : :
550 : 0 : static int dhcp4_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
551 : : int r;
552 : :
553 [ # # ]: 0 : assert(link);
554 : :
555 [ # # # # ]: 0 : if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
556 : 0 : return 1;
557 : :
558 : 0 : r = sd_netlink_message_get_errno(m);
559 [ # # # # ]: 0 : if (r < 0 && r != -EEXIST) {
560 [ # # # # ]: 0 : log_link_error_errno(link, r, "Could not set DHCPv4 address: %m");
561 : 0 : link_enter_failed(link);
562 : 0 : return 1;
563 [ # # ]: 0 : } else if (r >= 0)
564 : 0 : (void) manager_rtnl_process_address(rtnl, m, link->manager);
565 : :
566 : 0 : r = link_set_dhcp_routes(link);
567 [ # # ]: 0 : if (r < 0) {
568 : 0 : link_enter_failed(link);
569 : 0 : return 1;
570 : : }
571 : :
572 : : /* Add back static routes since kernel removes while DHCPv4 address is removed from when lease expires */
573 : 0 : r = link_request_set_routes(link);
574 [ # # ]: 0 : if (r < 0) {
575 : 0 : link_enter_failed(link);
576 : 0 : return 1;
577 : : }
578 : :
579 [ # # ]: 0 : if (link->dhcp4_messages == 0) {
580 : 0 : link->dhcp4_configured = true;
581 : : /* The new address is configured, and no route is requested.
582 : : * Let's drop the old lease. */
583 : 0 : dhcp4_release_old_lease(link);
584 : 0 : link_check_ready(link);
585 : : }
586 : :
587 : 0 : return 1;
588 : : }
589 : :
590 : 0 : static int dhcp4_update_address(Link *link,
591 : : struct in_addr *address,
592 : : struct in_addr *netmask,
593 : : uint32_t lifetime) {
594 : 0 : _cleanup_(address_freep) Address *addr = NULL;
595 : : unsigned prefixlen;
596 : : int r;
597 : :
598 [ # # ]: 0 : assert(address);
599 [ # # ]: 0 : assert(netmask);
600 [ # # ]: 0 : assert(lifetime);
601 : :
602 : 0 : prefixlen = in4_addr_netmask_to_prefixlen(netmask);
603 : :
604 : 0 : r = address_new(&addr);
605 [ # # ]: 0 : if (r < 0)
606 : 0 : return r;
607 : :
608 : 0 : addr->family = AF_INET;
609 : 0 : addr->in_addr.in.s_addr = address->s_addr;
610 : 0 : addr->cinfo.ifa_prefered = lifetime;
611 : 0 : addr->cinfo.ifa_valid = lifetime;
612 : 0 : addr->prefixlen = prefixlen;
613 : 0 : addr->broadcast.s_addr = address->s_addr | ~netmask->s_addr;
614 : :
615 : : /* allow reusing an existing address and simply update its lifetime
616 : : * in case it already exists */
617 : 0 : r = address_configure(addr, link, dhcp4_address_handler, true);
618 [ # # ]: 0 : if (r < 0)
619 : 0 : return r;
620 : :
621 : 0 : return 0;
622 : : }
623 : :
624 : 0 : static int dhcp_lease_renew(sd_dhcp_client *client, Link *link) {
625 : : sd_dhcp_lease *lease;
626 : : struct in_addr address;
627 : : struct in_addr netmask;
628 : 0 : uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
629 : : int r;
630 : :
631 [ # # ]: 0 : assert(link);
632 [ # # ]: 0 : assert(client);
633 [ # # ]: 0 : assert(link->network);
634 : :
635 : 0 : r = sd_dhcp_client_get_lease(client, &lease);
636 [ # # ]: 0 : if (r < 0)
637 [ # # # # ]: 0 : return log_link_warning_errno(link, r, "DHCP error: no lease: %m");
638 : :
639 : 0 : sd_dhcp_lease_unref(link->dhcp_lease);
640 : 0 : link->dhcp4_configured = false;
641 : 0 : link->dhcp_lease = sd_dhcp_lease_ref(lease);
642 : 0 : link_dirty(link);
643 : :
644 : 0 : r = sd_dhcp_lease_get_address(lease, &address);
645 [ # # ]: 0 : if (r < 0)
646 [ # # # # ]: 0 : return log_link_warning_errno(link, r, "DHCP error: no address: %m");
647 : :
648 : 0 : r = sd_dhcp_lease_get_netmask(lease, &netmask);
649 [ # # ]: 0 : if (r < 0)
650 [ # # # # ]: 0 : return log_link_warning_errno(link, r, "DHCP error: no netmask: %m");
651 : :
652 [ # # ]: 0 : if (!FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) {
653 : 0 : r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, &lifetime);
654 [ # # ]: 0 : if (r < 0)
655 [ # # # # ]: 0 : return log_link_warning_errno(link, r, "DHCP error: no lifetime: %m");
656 : : }
657 : :
658 : 0 : r = dhcp4_update_address(link, &address, &netmask, lifetime);
659 [ # # ]: 0 : if (r < 0)
660 [ # # # # ]: 0 : return log_link_warning_errno(link, r, "Could not update IP address: %m");
661 : :
662 : 0 : return 0;
663 : : }
664 : :
665 : 0 : static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) {
666 : : const struct in_addr *router;
667 : : sd_dhcp_lease *lease;
668 : : struct in_addr address;
669 : : struct in_addr netmask;
670 : : unsigned prefixlen;
671 : 0 : uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
672 : : int r;
673 : :
674 [ # # ]: 0 : assert(client);
675 [ # # ]: 0 : assert(link);
676 : :
677 : 0 : link->dhcp4_configured = false;
678 : :
679 : 0 : r = sd_dhcp_client_get_lease(client, &lease);
680 [ # # ]: 0 : if (r < 0)
681 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP error: No lease: %m");
682 : :
683 : 0 : r = sd_dhcp_lease_get_address(lease, &address);
684 [ # # ]: 0 : if (r < 0)
685 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP error: No address: %m");
686 : :
687 : 0 : r = sd_dhcp_lease_get_netmask(lease, &netmask);
688 [ # # ]: 0 : if (r < 0)
689 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP error: No netmask: %m");
690 : :
691 : 0 : prefixlen = in4_addr_netmask_to_prefixlen(&netmask);
692 : :
693 [ # # ]: 0 : if (!FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) {
694 : 0 : r = sd_dhcp_lease_get_lifetime(lease, &lifetime);
695 [ # # ]: 0 : if (r < 0)
696 [ # # # # ]: 0 : return log_link_warning_errno(link, r, "DHCP error: no lifetime: %m");
697 : : }
698 : :
699 : 0 : r = sd_dhcp_lease_get_router(lease, &router);
700 [ # # # # ]: 0 : if (r < 0 && r != -ENODATA)
701 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP error: Could not get gateway: %m");
702 : :
703 [ # # # # ]: 0 : if (r > 0 && !in4_addr_is_null(&router[0]))
704 : 0 : log_struct(LOG_INFO,
705 : : LOG_LINK_INTERFACE(link),
706 : : LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u",
707 : : ADDRESS_FMT_VAL(address),
708 : : prefixlen,
709 : : ADDRESS_FMT_VAL(router[0])),
710 : : "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address),
711 : : "PREFIXLEN=%u", prefixlen,
712 : : "GATEWAY=%u.%u.%u.%u", ADDRESS_FMT_VAL(router[0]));
713 : : else
714 : 0 : log_struct(LOG_INFO,
715 : : LOG_LINK_INTERFACE(link),
716 : : LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u",
717 : : ADDRESS_FMT_VAL(address),
718 : : prefixlen),
719 : : "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address),
720 : : "PREFIXLEN=%u", prefixlen);
721 : :
722 : 0 : link->dhcp_lease = sd_dhcp_lease_ref(lease);
723 : 0 : link_dirty(link);
724 : :
725 [ # # ]: 0 : if (link->network->dhcp_use_mtu) {
726 : : uint16_t mtu;
727 : :
728 : 0 : r = sd_dhcp_lease_get_mtu(lease, &mtu);
729 [ # # ]: 0 : if (r >= 0) {
730 : 0 : r = link_set_mtu(link, mtu);
731 [ # # ]: 0 : if (r < 0)
732 [ # # # # ]: 0 : log_link_error_errno(link, r, "Failed to set MTU to %" PRIu16 ": %m", mtu);
733 : : }
734 : : }
735 : :
736 [ # # ]: 0 : if (link->network->dhcp_use_hostname) {
737 : 0 : const char *dhcpname = NULL;
738 : 0 : _cleanup_free_ char *hostname = NULL;
739 : :
740 [ # # ]: 0 : if (link->network->dhcp_hostname)
741 : 0 : dhcpname = link->network->dhcp_hostname;
742 : : else
743 : 0 : (void) sd_dhcp_lease_get_hostname(lease, &dhcpname);
744 : :
745 [ # # ]: 0 : if (dhcpname) {
746 : 0 : r = shorten_overlong(dhcpname, &hostname);
747 [ # # ]: 0 : if (r < 0)
748 [ # # # # ]: 0 : log_link_warning_errno(link, r, "Unable to shorten overlong DHCP hostname '%s', ignoring: %m", dhcpname);
749 [ # # ]: 0 : if (r == 1)
750 [ # # # # ]: 0 : log_link_notice(link, "Overlong DHCP hostname received, shortened from '%s' to '%s'", dhcpname, hostname);
751 : : }
752 : :
753 [ # # ]: 0 : if (hostname) {
754 : 0 : r = manager_set_hostname(link->manager, hostname);
755 [ # # ]: 0 : if (r < 0)
756 [ # # # # ]: 0 : log_link_error_errno(link, r, "Failed to set transient hostname to '%s': %m", hostname);
757 : : }
758 : : }
759 : :
760 [ # # ]: 0 : if (link->network->dhcp_use_timezone) {
761 : 0 : const char *tz = NULL;
762 : :
763 : 0 : (void) sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
764 : :
765 [ # # ]: 0 : if (tz) {
766 : 0 : r = manager_set_timezone(link->manager, tz);
767 [ # # ]: 0 : if (r < 0)
768 [ # # # # ]: 0 : log_link_error_errno(link, r, "Failed to set timezone to '%s': %m", tz);
769 : : }
770 : : }
771 : :
772 : 0 : r = dhcp4_update_address(link, &address, &netmask, lifetime);
773 [ # # ]: 0 : if (r < 0)
774 [ # # # # ]: 0 : return log_link_warning_errno(link, r, "Could not update IP address: %m");
775 : :
776 : 0 : return 0;
777 : : }
778 : :
779 : 0 : static int dhcp_lease_ip_change(sd_dhcp_client *client, Link *link) {
780 : : int r;
781 : :
782 : 0 : link->dhcp_lease_old = TAKE_PTR(link->dhcp_lease);
783 : :
784 : : /* On ip address change, to keep the connectability, we would like to assign new address and
785 : : * routes, and then release old lease. There are two possible success paths:
786 : : *
787 : : * 1. new address and routes are configured.
788 : : * -> handled by dhcp_release_old_lease() in dhcp4_route_handler().
789 : : * 2. new address is configured and no route is requested.
790 : : * -> handled by dhcp_release_old_lease() in dhcp4_address_handler().
791 : : *
792 : : * On error in assigning new address and routes, then the link always enters to the failed
793 : : * state. And link_enter_failed() leads to the DHCP client to be stopped. So,
794 : : * dhcp_release_old_lease() will be also called by link_stop_clients().
795 : : */
796 : :
797 : 0 : r = dhcp_lease_acquired(client, link);
798 [ # # ]: 0 : if (r < 0) {
799 : : /* If it fails, then the new address is not configured yet.
800 : : * So, let's simply drop the old lease. */
801 : 0 : sd_dhcp_lease_unref(link->dhcp_lease);
802 : 0 : link->dhcp_lease = TAKE_PTR(link->dhcp_lease_old);
803 : 0 : (void) dhcp_lease_lost(link);
804 : 0 : return r;
805 : : }
806 : :
807 : 0 : return 0;
808 : : }
809 : :
810 : 0 : static int dhcp_server_is_black_listed(Link *link, sd_dhcp_client *client) {
811 : : sd_dhcp_lease *lease;
812 : : struct in_addr addr;
813 : : int r;
814 : :
815 [ # # ]: 0 : assert(link);
816 [ # # ]: 0 : assert(link->network);
817 [ # # ]: 0 : assert(client);
818 : :
819 : 0 : r = sd_dhcp_client_get_lease(client, &lease);
820 [ # # ]: 0 : if (r < 0)
821 [ # # # # ]: 0 : return log_link_error_errno(link, r, "Failed to get DHCP lease: %m");
822 : :
823 : 0 : r = sd_dhcp_lease_get_server_identifier(lease, &addr);
824 [ # # ]: 0 : if (r < 0)
825 [ # # # # ]: 0 : return log_link_debug_errno(link, r, "Failed to get DHCP server ip address: %m");
826 : :
827 [ # # ]: 0 : if (set_contains(link->network->dhcp_black_listed_ip, UINT32_TO_PTR(addr.s_addr))) {
828 : 0 : log_struct(LOG_DEBUG,
829 : : LOG_LINK_INTERFACE(link),
830 : : LOG_LINK_MESSAGE(link, "DHCPv4 ip '%u.%u.%u.%u' found in black listed ip addresses, ignoring offer",
831 : : ADDRESS_FMT_VAL(addr)));
832 : 0 : return true;
833 : : }
834 : :
835 : 0 : return false;
836 : : }
837 : :
838 : 0 : static int dhcp4_handler(sd_dhcp_client *client, int event, void *userdata) {
839 : 0 : Link *link = userdata;
840 : : int r;
841 : :
842 [ # # ]: 0 : assert(link);
843 [ # # ]: 0 : assert(link->network);
844 [ # # ]: 0 : assert(link->manager);
845 : :
846 [ # # # # ]: 0 : if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
847 : 0 : return 0;
848 : :
849 [ # # # # : 0 : switch (event) {
# # # ]
850 : 0 : case SD_DHCP_CLIENT_EVENT_STOP:
851 : :
852 [ # # ]: 0 : if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4)) {
853 [ # # ]: 0 : assert(link->ipv4ll);
854 : :
855 [ # # # # ]: 0 : log_link_debug(link, "DHCP client is stopped. Acquiring IPv4 link-local address");
856 : :
857 : 0 : r = sd_ipv4ll_start(link->ipv4ll);
858 [ # # ]: 0 : if (r < 0)
859 [ # # # # ]: 0 : return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
860 : : }
861 : :
862 [ # # ]: 0 : if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) {
863 [ # # # # ]: 0 : log_link_notice(link, "DHCPv4 connection considered critical, ignoring request to reconfigure it.");
864 : 0 : return 0;
865 : : }
866 : :
867 [ # # ]: 0 : if (link->network->dhcp_send_release)
868 : 0 : (void) sd_dhcp_client_send_release(client);
869 : :
870 [ # # ]: 0 : if (link->dhcp_lease) {
871 : 0 : r = dhcp_lease_lost(link);
872 [ # # ]: 0 : if (r < 0) {
873 : 0 : link_enter_failed(link);
874 : 0 : return r;
875 : : }
876 : : }
877 : :
878 : 0 : break;
879 : 0 : case SD_DHCP_CLIENT_EVENT_EXPIRED:
880 [ # # ]: 0 : if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) {
881 [ # # # # ]: 0 : log_link_notice(link, "DHCPv4 connection considered critical, ignoring request to reconfigure it.");
882 : 0 : return 0;
883 : : }
884 : :
885 [ # # ]: 0 : if (link->dhcp_lease) {
886 : 0 : r = dhcp_lease_lost(link);
887 [ # # ]: 0 : if (r < 0) {
888 : 0 : link_enter_failed(link);
889 : 0 : return r;
890 : : }
891 : : }
892 : :
893 : 0 : break;
894 : 0 : case SD_DHCP_CLIENT_EVENT_IP_CHANGE:
895 [ # # ]: 0 : if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) {
896 [ # # # # ]: 0 : log_link_notice(link, "DHCPv4 connection considered critical, ignoring request to reconfigure it.");
897 : 0 : return 0;
898 : : }
899 : :
900 : 0 : r = dhcp_lease_ip_change(client, link);
901 [ # # ]: 0 : if (r < 0) {
902 : 0 : link_enter_failed(link);
903 : 0 : return r;
904 : : }
905 : :
906 : 0 : break;
907 : 0 : case SD_DHCP_CLIENT_EVENT_RENEW:
908 : 0 : r = dhcp_lease_renew(client, link);
909 [ # # ]: 0 : if (r < 0) {
910 : 0 : link_enter_failed(link);
911 : 0 : return r;
912 : : }
913 : 0 : break;
914 : 0 : case SD_DHCP_CLIENT_EVENT_IP_ACQUIRE:
915 : 0 : r = dhcp_lease_acquired(client, link);
916 [ # # ]: 0 : if (r < 0) {
917 : 0 : link_enter_failed(link);
918 : 0 : return r;
919 : : }
920 : 0 : break;
921 : 0 : case SD_DHCP_CLIENT_EVENT_SELECTING:
922 : 0 : r = dhcp_server_is_black_listed(link, client);
923 [ # # ]: 0 : if (r < 0)
924 : 0 : return r;
925 [ # # ]: 0 : if (r != 0)
926 : 0 : return -ENOMSG;
927 : 0 : break;
928 : 0 : default:
929 [ # # ]: 0 : if (event < 0)
930 [ # # # # ]: 0 : log_link_warning_errno(link, event, "DHCP error: Client failed: %m");
931 : : else
932 [ # # # # ]: 0 : log_link_warning(link, "DHCP unknown event: %i", event);
933 : 0 : break;
934 : : }
935 : :
936 : 0 : return 0;
937 : : }
938 : :
939 : 0 : static int dhcp4_set_hostname(Link *link) {
940 : 0 : _cleanup_free_ char *hostname = NULL;
941 : : const char *hn;
942 : : int r;
943 : :
944 [ # # ]: 0 : assert(link);
945 : :
946 [ # # ]: 0 : if (!link->network->dhcp_send_hostname)
947 : 0 : hn = NULL;
948 [ # # ]: 0 : else if (link->network->dhcp_hostname)
949 : 0 : hn = link->network->dhcp_hostname;
950 : : else {
951 : 0 : r = gethostname_strict(&hostname);
952 [ # # # # ]: 0 : if (r < 0 && r != -ENXIO) /* ENXIO: no hostname set or hostname is "localhost" */
953 : 0 : return r;
954 : :
955 : 0 : hn = hostname;
956 : : }
957 : :
958 : 0 : r = sd_dhcp_client_set_hostname(link->dhcp_client, hn);
959 [ # # # # ]: 0 : if (r == -EINVAL && hostname)
960 : : /* Ignore error when the machine's hostname is not suitable to send in DHCP packet. */
961 [ # # # # ]: 0 : log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set hostname from kernel hostname, ignoring: %m");
962 [ # # ]: 0 : else if (r < 0)
963 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set hostname: %m");
964 : :
965 : 0 : return 0;
966 : : }
967 : :
968 : 0 : static bool promote_secondaries_enabled(const char *ifname) {
969 : 0 : _cleanup_free_ char *promote_secondaries_sysctl = NULL;
970 : : char *promote_secondaries_path;
971 : : int r;
972 : :
973 [ # # # # : 0 : promote_secondaries_path = strjoina("net/ipv4/conf/", ifname, "/promote_secondaries");
# # # # #
# # # ]
974 : 0 : r = sysctl_read(promote_secondaries_path, &promote_secondaries_sysctl);
975 [ # # ]: 0 : if (r < 0) {
976 [ # # ]: 0 : log_debug_errno(r, "Cannot read sysctl %s", promote_secondaries_path);
977 : 0 : return false;
978 : : }
979 : :
980 : 0 : truncate_nl(promote_secondaries_sysctl);
981 : 0 : r = parse_boolean(promote_secondaries_sysctl);
982 [ # # ]: 0 : if (r < 0)
983 [ # # ]: 0 : log_warning_errno(r, "Cannot parse sysctl %s with content %s as boolean", promote_secondaries_path, promote_secondaries_sysctl);
984 : 0 : return r > 0;
985 : : }
986 : :
987 : : /* dhcp4_set_promote_secondaries will ensure this interface has
988 : : * the "promote_secondaries" option in the kernel set. If this sysctl
989 : : * is not set DHCP will work only as long as the IP address does not
990 : : * changes between leases. The kernel will remove all secondary IP
991 : : * addresses of an interface otherwise. The way systemd-network works
992 : : * is that the new IP of a lease is added as a secondary IP and when
993 : : * the primary one expires it relies on the kernel to promote the
994 : : * secondary IP. See also https://github.com/systemd/systemd/issues/7163
995 : : */
996 : 0 : int dhcp4_set_promote_secondaries(Link *link) {
997 : : int r;
998 : :
999 [ # # ]: 0 : assert(link);
1000 [ # # ]: 0 : assert(link->network);
1001 [ # # ]: 0 : assert(link->network->dhcp & ADDRESS_FAMILY_IPV4);
1002 : :
1003 : : /* check if the kernel has promote_secondaries enabled for our
1004 : : * interface. If it is not globally enabled or enabled for the
1005 : : * specific interface we must either enable it.
1006 : : */
1007 [ # # # # ]: 0 : if (!(promote_secondaries_enabled("all") || promote_secondaries_enabled(link->ifname))) {
1008 : 0 : char *promote_secondaries_path = NULL;
1009 : :
1010 [ # # # # ]: 0 : log_link_debug(link, "promote_secondaries is unset, setting it");
1011 [ # # # # : 0 : promote_secondaries_path = strjoina("net/ipv4/conf/", link->ifname, "/promote_secondaries");
# # # # #
# # # ]
1012 : 0 : r = sysctl_write(promote_secondaries_path, "1");
1013 [ # # ]: 0 : if (r < 0)
1014 [ # # # # ]: 0 : log_link_warning_errno(link, r, "cannot set sysctl %s to 1", promote_secondaries_path);
1015 : 0 : return r > 0;
1016 : : }
1017 : :
1018 : 0 : return 0;
1019 : : }
1020 : :
1021 : 0 : int dhcp4_set_client_identifier(Link *link) {
1022 : : int r;
1023 : :
1024 [ # # ]: 0 : assert(link);
1025 [ # # ]: 0 : assert(link->network);
1026 [ # # ]: 0 : assert(link->dhcp_client);
1027 : :
1028 [ # # # # ]: 0 : switch (link->network->dhcp_client_identifier) {
1029 : 0 : case DHCP_CLIENT_ID_DUID: {
1030 : : /* If configured, apply user specified DUID and IAID */
1031 : 0 : const DUID *duid = link_get_duid(link);
1032 : :
1033 [ # # # # ]: 0 : if (duid->type == DUID_TYPE_LLT && duid->raw_data_len == 0)
1034 : 0 : r = sd_dhcp_client_set_iaid_duid_llt(link->dhcp_client,
1035 : 0 : link->network->iaid_set,
1036 : 0 : link->network->iaid,
1037 : : duid->llt_time);
1038 : : else
1039 : 0 : r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
1040 : 0 : link->network->iaid_set,
1041 : 0 : link->network->iaid,
1042 : 0 : duid->type,
1043 : 0 : duid->raw_data_len > 0 ? duid->raw_data : NULL,
1044 [ # # ]: 0 : duid->raw_data_len);
1045 [ # # ]: 0 : if (r < 0)
1046 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set IAID+DUID: %m");
1047 : 0 : break;
1048 : : }
1049 : 0 : case DHCP_CLIENT_ID_DUID_ONLY: {
1050 : : /* If configured, apply user specified DUID */
1051 : 0 : const DUID *duid = link_get_duid(link);
1052 : :
1053 [ # # # # ]: 0 : if (duid->type == DUID_TYPE_LLT && duid->raw_data_len == 0)
1054 : 0 : r = sd_dhcp_client_set_duid_llt(link->dhcp_client,
1055 : : duid->llt_time);
1056 : : else
1057 : 0 : r = sd_dhcp_client_set_duid(link->dhcp_client,
1058 : 0 : duid->type,
1059 : 0 : duid->raw_data_len > 0 ? duid->raw_data : NULL,
1060 [ # # ]: 0 : duid->raw_data_len);
1061 [ # # ]: 0 : if (r < 0)
1062 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set DUID: %m");
1063 : 0 : break;
1064 : : }
1065 : 0 : case DHCP_CLIENT_ID_MAC:
1066 : 0 : r = sd_dhcp_client_set_client_id(link->dhcp_client,
1067 : : ARPHRD_ETHER,
1068 : 0 : (const uint8_t *) &link->mac,
1069 : : sizeof(link->mac));
1070 [ # # ]: 0 : if (r < 0)
1071 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set client ID: %m");
1072 : 0 : break;
1073 : 0 : default:
1074 : 0 : assert_not_reached("Unknown client identifier type.");
1075 : : }
1076 : :
1077 : 0 : return 0;
1078 : : }
1079 : :
1080 : 0 : int dhcp4_configure(Link *link) {
1081 : : int r;
1082 : :
1083 [ # # ]: 0 : assert(link);
1084 [ # # ]: 0 : assert(link->network);
1085 [ # # ]: 0 : assert(link->network->dhcp & ADDRESS_FAMILY_IPV4);
1086 : :
1087 [ # # ]: 0 : if (!link->dhcp_client) {
1088 : 0 : r = sd_dhcp_client_new(&link->dhcp_client, link->network->dhcp_anonymize);
1089 [ # # ]: 0 : if (r == -ENOMEM)
1090 : 0 : return log_oom();
1091 [ # # ]: 0 : if (r < 0)
1092 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to create DHCP4 client: %m");
1093 : : }
1094 : :
1095 : 0 : r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
1096 [ # # ]: 0 : if (r < 0)
1097 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to attach event: %m");
1098 : :
1099 : 0 : r = sd_dhcp_client_set_mac(link->dhcp_client,
1100 : 0 : (const uint8_t *) &link->mac,
1101 : : sizeof (link->mac), ARPHRD_ETHER);
1102 [ # # ]: 0 : if (r < 0)
1103 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set MAC address: %m");
1104 : :
1105 : 0 : r = sd_dhcp_client_set_ifindex(link->dhcp_client, link->ifindex);
1106 [ # # ]: 0 : if (r < 0)
1107 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set ifindex: %m");
1108 : :
1109 : 0 : r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp4_handler, link);
1110 [ # # ]: 0 : if (r < 0)
1111 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set callback: %m");
1112 : :
1113 : 0 : r = sd_dhcp_client_set_request_broadcast(link->dhcp_client,
1114 : 0 : link->network->dhcp_broadcast);
1115 [ # # ]: 0 : if (r < 0)
1116 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for broadcast: %m");
1117 : :
1118 [ # # ]: 0 : if (link->mtu) {
1119 : 0 : r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
1120 [ # # ]: 0 : if (r < 0)
1121 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set MTU: %m");
1122 : : }
1123 : :
1124 [ # # ]: 0 : if (link->network->dhcp_use_mtu) {
1125 : 0 : r = sd_dhcp_client_set_request_option(link->dhcp_client,
1126 : : SD_DHCP_OPTION_INTERFACE_MTU);
1127 [ # # ]: 0 : if (r < 0)
1128 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for MTU: %m");
1129 : : }
1130 : :
1131 : : /* NOTE: even if this variable is called "use", it also "sends" PRL
1132 : : * options, maybe there should be a different configuration variable
1133 : : * to send or not route options?. */
1134 : : /* NOTE: when using Anonymize=yes, routes PRL options are sent
1135 : : * by default, so they don't need to be added here. */
1136 [ # # # # ]: 0 : if (link->network->dhcp_use_routes && !link->network->dhcp_anonymize) {
1137 : 0 : r = sd_dhcp_client_set_request_option(link->dhcp_client,
1138 : : SD_DHCP_OPTION_STATIC_ROUTE);
1139 [ # # ]: 0 : if (r < 0)
1140 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for static route: %m");
1141 : :
1142 : 0 : r = sd_dhcp_client_set_request_option(link->dhcp_client,
1143 : : SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE);
1144 [ # # ]: 0 : if (r < 0)
1145 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for classless static route: %m");
1146 : : }
1147 : :
1148 [ # # # # ]: 0 : if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO && !link->network->dhcp_anonymize) {
1149 : 0 : r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_DOMAIN_SEARCH_LIST);
1150 [ # # ]: 0 : if (r < 0)
1151 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for domain search list: %m");
1152 : : }
1153 : :
1154 [ # # ]: 0 : if (link->network->dhcp_use_ntp) {
1155 : 0 : r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NTP_SERVER);
1156 [ # # ]: 0 : if (r < 0)
1157 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for NTP server: %m");
1158 : : }
1159 : :
1160 [ # # ]: 0 : if (link->network->dhcp_use_timezone) {
1161 : 0 : r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NEW_TZDB_TIMEZONE);
1162 [ # # ]: 0 : if (r < 0)
1163 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for timezone: %m");
1164 : : }
1165 : :
1166 : 0 : r = dhcp4_set_hostname(link);
1167 [ # # ]: 0 : if (r < 0)
1168 : 0 : return r;
1169 : :
1170 [ # # ]: 0 : if (link->network->dhcp_vendor_class_identifier) {
1171 : 0 : r = sd_dhcp_client_set_vendor_class_identifier(link->dhcp_client,
1172 : 0 : link->network->dhcp_vendor_class_identifier);
1173 [ # # ]: 0 : if (r < 0)
1174 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set vendor class identifier: %m");
1175 : : }
1176 : :
1177 [ # # ]: 0 : if (link->network->dhcp_user_class) {
1178 : 0 : r = sd_dhcp_client_set_user_class(link->dhcp_client, (const char **) link->network->dhcp_user_class);
1179 [ # # ]: 0 : if (r < 0)
1180 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set user class: %m");
1181 : : }
1182 : :
1183 [ # # ]: 0 : if (link->network->dhcp_client_port) {
1184 : 0 : r = sd_dhcp_client_set_client_port(link->dhcp_client, link->network->dhcp_client_port);
1185 [ # # ]: 0 : if (r < 0)
1186 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set listen port: %m");
1187 : : }
1188 : :
1189 [ # # ]: 0 : if (link->network->dhcp_max_attempts > 0) {
1190 : 0 : r = sd_dhcp_client_set_max_attempts(link->dhcp_client, link->network->dhcp_max_attempts);
1191 [ # # ]: 0 : if (r < 0)
1192 [ # # # # ]: 0 : return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set max attempts: %m");
1193 : : }
1194 : :
1195 : 0 : return dhcp4_set_client_identifier(link);
1196 : : }
1197 : :
1198 : 0 : int config_parse_dhcp_max_attempts(
1199 : : const char *unit,
1200 : : const char *filename,
1201 : : unsigned line,
1202 : : const char *section,
1203 : : unsigned section_line,
1204 : : const char *lvalue,
1205 : : int ltype,
1206 : : const char *rvalue,
1207 : : void *data,
1208 : : void *userdata) {
1209 : :
1210 : 0 : Network *network = data;
1211 : : uint64_t a;
1212 : : int r;
1213 : :
1214 [ # # ]: 0 : assert(network);
1215 [ # # ]: 0 : assert(lvalue);
1216 [ # # ]: 0 : assert(rvalue);
1217 : :
1218 [ # # ]: 0 : if (isempty(rvalue)) {
1219 : 0 : network->dhcp_max_attempts = 0;
1220 : 0 : return 0;
1221 : : }
1222 : :
1223 [ # # ]: 0 : if (streq(rvalue, "infinity")) {
1224 : 0 : network->dhcp_max_attempts = (uint64_t) -1;
1225 : 0 : return 0;
1226 : : }
1227 : :
1228 : 0 : r = safe_atou64(rvalue, &a);
1229 [ # # ]: 0 : if (r < 0) {
1230 [ # # ]: 0 : log_syntax(unit, LOG_ERR, filename, line, r,
1231 : : "Failed to parse DHCP maximum attempts, ignoring: %s", rvalue);
1232 : 0 : return 0;
1233 : : }
1234 : :
1235 [ # # ]: 0 : if (a == 0) {
1236 [ # # ]: 0 : log_syntax(unit, LOG_ERR, filename, line, 0,
1237 : : "%s= must be positive integer or 'infinity', ignoring: %s", lvalue, rvalue);
1238 : 0 : return 0;
1239 : : }
1240 : :
1241 : 0 : network->dhcp_max_attempts = a;
1242 : :
1243 : 0 : return 0;
1244 : : }
1245 : :
1246 : 0 : int config_parse_dhcp_black_listed_ip_address(
1247 : : const char *unit,
1248 : : const char *filename,
1249 : : unsigned line,
1250 : : const char *section,
1251 : : unsigned section_line,
1252 : : const char *lvalue,
1253 : : int ltype,
1254 : : const char *rvalue,
1255 : : void *data,
1256 : : void *userdata) {
1257 : :
1258 : 0 : Network *network = data;
1259 : : const char *p;
1260 : : int r;
1261 : :
1262 [ # # ]: 0 : assert(filename);
1263 [ # # ]: 0 : assert(lvalue);
1264 [ # # ]: 0 : assert(rvalue);
1265 [ # # ]: 0 : assert(data);
1266 : :
1267 [ # # ]: 0 : if (isempty(rvalue)) {
1268 : 0 : network->dhcp_black_listed_ip = set_free(network->dhcp_black_listed_ip);
1269 : 0 : return 0;
1270 : : }
1271 : :
1272 : 0 : for (p = rvalue;;) {
1273 [ # # # ]: 0 : _cleanup_free_ char *n = NULL;
1274 : : union in_addr_union ip;
1275 : :
1276 : 0 : r = extract_first_word(&p, &n, NULL, 0);
1277 [ # # ]: 0 : if (r < 0) {
1278 [ # # ]: 0 : log_syntax(unit, LOG_ERR, filename, line, r,
1279 : : "Failed to parse DHCP black listed ip address, ignoring assignment: %s",
1280 : : rvalue);
1281 : 0 : return 0;
1282 : : }
1283 [ # # ]: 0 : if (r == 0)
1284 : 0 : return 0;
1285 : :
1286 : 0 : r = in_addr_from_string(AF_INET, n, &ip);
1287 [ # # ]: 0 : if (r < 0) {
1288 [ # # ]: 0 : log_syntax(unit, LOG_ERR, filename, line, r,
1289 : : "DHCP black listed ip address is invalid, ignoring assignment: %s", n);
1290 : 0 : continue;
1291 : : }
1292 : :
1293 : 0 : r = set_ensure_allocated(&network->dhcp_black_listed_ip, NULL);
1294 [ # # ]: 0 : if (r < 0)
1295 : 0 : return log_oom();
1296 : :
1297 : 0 : r = set_put(network->dhcp_black_listed_ip, UINT32_TO_PTR(ip.in.s_addr));
1298 [ # # ]: 0 : if (r < 0)
1299 [ # # ]: 0 : log_syntax(unit, LOG_ERR, filename, line, r,
1300 : : "Failed to store DHCP black listed ip address '%s', ignoring assignment: %m", n);
1301 : : }
1302 : :
1303 : : return 0;
1304 : : }
1305 : :
1306 : 0 : int config_parse_dhcp_user_class(
1307 : : const char *unit,
1308 : : const char *filename,
1309 : : unsigned line,
1310 : : const char *section,
1311 : : unsigned section_line,
1312 : : const char *lvalue,
1313 : : int ltype,
1314 : : const char *rvalue,
1315 : : void *data,
1316 : : void *userdata) {
1317 : :
1318 : 0 : char ***l = data;
1319 : : int r;
1320 : :
1321 [ # # ]: 0 : assert(l);
1322 [ # # ]: 0 : assert(lvalue);
1323 [ # # ]: 0 : assert(rvalue);
1324 : :
1325 [ # # ]: 0 : if (isempty(rvalue)) {
1326 : 0 : *l = strv_free(*l);
1327 : 0 : return 0;
1328 : : }
1329 : :
1330 : 0 : for (;;) {
1331 [ # # # # ]: 0 : _cleanup_free_ char *w = NULL;
1332 : :
1333 : 0 : r = extract_first_word(&rvalue, &w, NULL, 0);
1334 [ # # ]: 0 : if (r == -ENOMEM)
1335 : 0 : return log_oom();
1336 [ # # ]: 0 : if (r < 0) {
1337 [ # # ]: 0 : log_syntax(unit, LOG_ERR, filename, line, r,
1338 : : "Failed to split user classes option, ignoring: %s", rvalue);
1339 : 0 : break;
1340 : : }
1341 [ # # ]: 0 : if (r == 0)
1342 : 0 : break;
1343 : :
1344 [ # # ]: 0 : if (strlen(w) > 255) {
1345 [ # # ]: 0 : log_syntax(unit, LOG_ERR, filename, line, 0,
1346 : : "%s length is not in the range 1-255, ignoring.", w);
1347 : 0 : continue;
1348 : : }
1349 : :
1350 : 0 : r = strv_push(l, w);
1351 [ # # ]: 0 : if (r < 0)
1352 : 0 : return log_oom();
1353 : :
1354 : 0 : w = NULL;
1355 : : }
1356 : :
1357 : 0 : return 0;
1358 : : }
1359 : :
1360 : : static const char* const dhcp_client_identifier_table[_DHCP_CLIENT_ID_MAX] = {
1361 : : [DHCP_CLIENT_ID_MAC] = "mac",
1362 : : [DHCP_CLIENT_ID_DUID] = "duid",
1363 : : [DHCP_CLIENT_ID_DUID_ONLY] = "duid-only",
1364 : : };
1365 : :
1366 : 0 : DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(dhcp_client_identifier, DHCPClientIdentifier);
1367 [ # # # # : 0 : DEFINE_CONFIG_PARSE_ENUM(config_parse_dhcp_client_identifier, dhcp_client_identifier, DHCPClientIdentifier,
# # # # #
# # # ]
1368 : : "Failed to parse client identifier type");
|
