]> git.ipfire.org Git - thirdparty/systemd.git/blob - src/network/networkd-dhcp-prefix-delegation.c
projects / thirdparty / systemd.git / blob
? search:


1a5ccf1d20dbe0df131a0076d3b353b64610dd93
[thirdparty/systemd.git] / src / network / networkd-dhcp-prefix-delegation.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include <linux/ipv6_route.h>
4 #include <linux/rtnetlink.h>
5
6 #include "sd-dhcp-client.h"
7 #include "sd-dhcp6-client.h"
8 #include "sd-netlink.h"
9 #include "sd-radv.h"
10
11 #include "dhcp6-lease-internal.h"
12 #include "errno-util.h"
13 #include "hashmap.h"
14 #include "in-addr-prefix-util.h"
15 #include "networkd-address.h"
16 #include "networkd-address-generation.h"
17 #include "networkd-dhcp-prefix-delegation.h"
18 #include "networkd-dhcp6.h"
19 #include "networkd-link.h"
20 #include "networkd-manager.h"
21 #include "networkd-queue.h"
22 #include "networkd-radv.h"
23 #include "networkd-route.h"
24 #include "networkd-route-util.h"
25 #include "networkd-setlink.h"
26 #include "parse-util.h"
27 #include "set.h"
28 #include "string-util.h"
29 #include "strv.h"
30 #include "tunnel.h"
31
32 bool link_dhcp_pd_is_enabled(Link *link) {
33 assert(link);
34
35 if (!link->network)
36 return false;
37
38 return link->network->dhcp_pd;
39 }
40
41 bool dhcp_pd_is_uplink(Link *link, Link *target, bool accept_auto) {
42 assert(link);
43 assert(target);
44
45 if (!link_dhcp_pd_is_enabled(link))
46 return false;
47
48 if (link->network->dhcp_pd_uplink_name)
49 return streq_ptr(target->ifname, link->network->dhcp_pd_uplink_name) ||
50 strv_contains(target->alternative_names, link->network->dhcp_pd_uplink_name);
51
52 if (link->network->dhcp_pd_uplink_index > 0)
53 return target->ifindex == link->network->dhcp_pd_uplink_index;
54
55 if (link->network->dhcp_pd_uplink_index == UPLINK_INDEX_SELF)
56 return link == target;
57
58 assert(link->network->dhcp_pd_uplink_index == UPLINK_INDEX_AUTO);
59 return accept_auto;
60 }
61
62 static void link_remove_dhcp_pd_subnet_prefix(Link *link, const struct in6_addr *prefix) {
63 void *key;
64
65 assert(link);
66 assert(link->manager);
67 assert(prefix);
68
69 if (hashmap_get(link->manager->links_by_dhcp_pd_subnet_prefix, prefix) != link)
70 return;
71
72 hashmap_remove2(link->manager->links_by_dhcp_pd_subnet_prefix, prefix, &key);
73 free(key);
74 }
75
76 static int link_add_dhcp_pd_subnet_prefix(Link *link, const struct in6_addr *prefix) {
77 _cleanup_free_ struct in6_addr *copy = NULL;
78 int r;
79
80 assert(link);
81 assert(prefix);
82
83 copy = newdup(struct in6_addr, prefix, 1);
84 if (!copy)
85 return -ENOMEM;
86
87 r = hashmap_ensure_put(&link->manager->links_by_dhcp_pd_subnet_prefix, &in6_addr_hash_ops_free, copy, link);
88 if (r < 0)
89 return r;
90 if (r > 0)
91 TAKE_PTR(copy);
92
93 return 0;
94 }
95
96 static int link_get_by_dhcp_pd_subnet_prefix(Manager *manager, const struct in6_addr *prefix, Link **ret) {
97 Link *link;
98
99 assert(manager);
100 assert(prefix);
101
102 link = hashmap_get(manager->links_by_dhcp_pd_subnet_prefix, prefix);
103 if (!link)
104 return -ENODEV;
105
106 if (ret)
107 *ret = link;
108 return 0;
109 }
110
111 static int dhcp_pd_get_assigned_subnet_prefix(Link *link, const struct in6_addr *pd_prefix, uint8_t pd_prefix_len, struct in6_addr *ret) {
112 assert(link);
113 assert(link->manager);
114 assert(pd_prefix);
115
116 if (!link_dhcp_pd_is_enabled(link))
117 return -ENOENT;
118
119 if (link->network->dhcp_pd_assign) {
120 Address *address;
121
122 SET_FOREACH(address, link->addresses) {
123 if (address->source != NETWORK_CONFIG_SOURCE_DHCP_PD)
124 continue;
125 assert(address->family == AF_INET6);
126
127 if (in6_addr_prefix_covers(pd_prefix, pd_prefix_len, &address->in_addr.in6) <= 0)
128 continue;
129
130 if (ret) {
131 struct in6_addr prefix = address->in_addr.in6;
132
133 in6_addr_mask(&prefix, 64);
134 *ret = prefix;
135 }
136 return 0;
137 }
138 } else {
139 Route *route;
140
141 SET_FOREACH(route, link->manager->routes) {
142 if (route->source != NETWORK_CONFIG_SOURCE_DHCP_PD)
143 continue;
144 assert(route->family == AF_INET6);
145
146 if (route->nexthop.ifindex != link->ifindex)
147 continue;
148
149 if (in6_addr_prefix_covers(pd_prefix, pd_prefix_len, &route->dst.in6) > 0) {
150 if (ret)
151 *ret = route->dst.in6;
152 return 0;
153 }
154 }
155 }
156
157 return -ENOENT;
158 }
159
160 int dhcp_pd_remove(Link *link, bool only_marked) {
161 int ret = 0;
162
163 assert(link);
164 assert(link->manager);
165
166 if (!link_dhcp_pd_is_enabled(link))
167 return 0;
168
169 if (!only_marked)
170 link->dhcp_pd_configured = false;
171
172 if (!link->network->dhcp_pd_assign) {
173 Route *route;
174
175 SET_FOREACH(route, link->manager->routes) {
176 if (route->source != NETWORK_CONFIG_SOURCE_DHCP_PD)
177 continue;
178 if (route->nexthop.ifindex != link->ifindex)
179 continue;
180 if (only_marked && !route_is_marked(route))
181 continue;
182
183 if (link->radv)
184 sd_radv_remove_prefix(link->radv, &route->dst.in6, 64);
185
186 link_remove_dhcp_pd_subnet_prefix(link, &route->dst.in6);
187
188 RET_GATHER(ret, route_remove_and_cancel(route, link->manager));
189 }
190 } else {
191 Address *address;
192
193 SET_FOREACH(address, link->addresses) {
194 struct in6_addr prefix;
195
196 if (address->source != NETWORK_CONFIG_SOURCE_DHCP_PD)
197 continue;
198 if (only_marked && !address_is_marked(address))
199 continue;
200
201 prefix = address->in_addr.in6;
202 in6_addr_mask(&prefix, 64);
203
204 if (link->radv)
205 sd_radv_remove_prefix(link->radv, &prefix, 64);
206
207 link_remove_dhcp_pd_subnet_prefix(link, &prefix);
208
209 RET_GATHER(ret, address_remove_and_cancel(address, link));
210 }
211 }
212
213 return ret;
214 }
215
216 static int dhcp_pd_check_ready(Link *link);
217
218 static int dhcp_pd_address_ready_callback(Address *address) {
219 Address *a;
220
221 assert(address);
222 assert(address->link);
223
224 SET_FOREACH(a, address->link->addresses)
225 if (a->source == NETWORK_CONFIG_SOURCE_DHCP_PD)
226 a->callback = NULL;
227
228 return dhcp_pd_check_ready(address->link);
229 }
230
231 static int dhcp_pd_check_ready(Link *link) {
232 int r;
233
234 assert(link);
235 assert(link->network);
236
237 if (link->dhcp_pd_messages > 0) {
238 log_link_debug(link, "%s(): DHCP-PD addresses and routes are not set.", __func__);
239 return 0;
240 }
241
242 if (link->network->dhcp_pd_assign) {
243 bool has_ready = false;
244 Address *address;
245
246 SET_FOREACH(address, link->addresses) {
247 if (address->source != NETWORK_CONFIG_SOURCE_DHCP_PD)
248 continue;
249 if (address_is_ready(address)) {
250 has_ready = true;
251 break;
252 }
253 }
254
255 if (!has_ready) {
256 SET_FOREACH(address, link->addresses)
257 if (address->source == NETWORK_CONFIG_SOURCE_DHCP_PD)
258 address->callback = dhcp_pd_address_ready_callback;
259
260 log_link_debug(link, "%s(): no DHCP-PD address is ready.", __func__);
261 return 0;
262 }
263 }
264
265 link->dhcp_pd_configured = true;
266
267 log_link_debug(link, "DHCP-PD addresses and routes set.");
268
269 r = dhcp_pd_remove(link, /* only_marked = */ true);
270 if (r < 0)
271 return r;
272
273 link_check_ready(link);
274 return 1;
275 }
276
277 static int dhcp_pd_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Route *route) {
278 int r;
279
280 assert(req);
281 assert(link);
282 assert(route);
283
284 r = route_configure_handler_internal(m, req, route);
285 if (r <= 0)
286 return r;
287
288 r = dhcp_pd_check_ready(link);
289 if (r < 0)
290 link_enter_failed(link);
291
292 return 1;
293 }
294
295 static int dhcp_pd_request_route(Link *link, const struct in6_addr *prefix, usec_t lifetime_usec) {
296 _cleanup_(route_unrefp) Route *route = NULL;
297 Route *existing;
298 int r;
299
300 assert(link);
301 assert(link->manager);
302 assert(link->network);
303 assert(prefix);
304
305 if (link->network->dhcp_pd_assign)
306 return 0;
307
308 r = route_new(&route);
309 if (r < 0)
310 return r;
311
312 route->source = NETWORK_CONFIG_SOURCE_DHCP_PD;
313 route->family = AF_INET6;
314 route->dst.in6 = *prefix;
315 route->dst_prefixlen = 64;
316 route->protocol = RTPROT_DHCP;
317 route->priority = link->network->dhcp_pd_route_metric;
318 route->lifetime_usec = lifetime_usec;
319
320 r = route_adjust_nexthops(route, link);
321 if (r < 0)
322 return r;
323
324 if (route_get(link->manager, route, &existing) < 0)
325 link->dhcp_pd_configured = false;
326 else
327 route_unmark(existing);
328
329 r = link_request_route(link, route, &link->dhcp_pd_messages, dhcp_pd_route_handler);
330 if (r < 0)
331 return log_link_error_errno(link, r, "Failed to request DHCP-PD prefix route: %m");
332
333 return 0;
334 }
335
336 static int dhcp_pd_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Address *address) {
337 int r;
338
339 assert(link);
340 assert(address);
341
342 r = address_configure_handler_internal(m, link, address);
343 if (r <= 0)
344 return r;
345
346 r = dhcp_pd_check_ready(link);
347 if (r < 0)
348 link_enter_failed(link);
349
350 return 1;
351 }
352
353 static void log_dhcp_pd_address(Link *link, const Address *address) {
354 assert(address);
355 assert(address->family == AF_INET6);
356
357 int log_level = address_get_harder(link, address, NULL) >= 0 ? LOG_DEBUG : LOG_INFO;
358
359 if (log_level < log_get_max_level())
360 return;
361
362 log_link_full(link, log_level, "DHCP-PD address %s (valid %s, preferred %s)",
363 IN6_ADDR_PREFIX_TO_STRING(&address->in_addr.in6, address->prefixlen),
364 FORMAT_LIFETIME(address->lifetime_valid_usec),
365 FORMAT_LIFETIME(address->lifetime_preferred_usec));
366 }
367
368 static int dhcp_pd_request_address_one(Address *address, Link *link) {
369 Address *existing;
370
371 assert(address);
372 assert(link);
373
374 log_dhcp_pd_address(link, address);
375
376 if (address_get(link, address, &existing) < 0)
377 link->dhcp_pd_configured = false;
378 else
379 address_unmark(existing);
380
381 return link_request_address(link, address, &link->dhcp_pd_messages, dhcp_pd_address_handler, NULL);
382 }
383
384 int dhcp_pd_reconfigure_address(Address *address, Link *link) {
385 int r;
386
387 assert(address);
388 assert(address->source == NETWORK_CONFIG_SOURCE_DHCP_PD);
389 assert(link);
390
391 r = regenerate_address(address, link);
392 if (r <= 0)
393 return r;
394
395 r = dhcp_pd_request_address_one(address, link);
396 if (r < 0)
397 return r;
398
399 if (!link->dhcp_pd_configured)
400 link_set_state(link, LINK_STATE_CONFIGURING);
401
402 link_check_ready(link);
403 return 0;
404 }
405
406 static int dhcp_pd_request_address(
407 Link *link,
408 const struct in6_addr *prefix,
409 usec_t lifetime_preferred_usec,
410 usec_t lifetime_valid_usec) {
411
412 int r;
413
414 assert(link);
415 assert(link->network);
416 assert(prefix);
417
418 if (!link->network->dhcp_pd_assign)
419 return 0;
420
421 _cleanup_hashmap_free_ Hashmap *tokens_by_address = NULL;
422 r = dhcp_pd_generate_addresses(link, prefix, &tokens_by_address);
423 if (r < 0)
424 return log_link_warning_errno(link, r, "Failed to generate addresses for acquired DHCP delegated prefix: %m");
425
426 IPv6Token *token;
427 struct in6_addr *a;
428 HASHMAP_FOREACH_KEY(token, a, tokens_by_address) {
429 _cleanup_(address_unrefp) Address *address = NULL;
430
431 r = address_new(&address);
432 if (r < 0)
433 return log_link_error_errno(link, r, "Failed to allocate address for DHCP delegated prefix: %m");
434
435 address->source = NETWORK_CONFIG_SOURCE_DHCP_PD;
436 address->family = AF_INET6;
437 address->in_addr.in6 = *a;
438 address->prefixlen = 64;
439 address->lifetime_preferred_usec = lifetime_preferred_usec;
440 address->lifetime_valid_usec = lifetime_valid_usec;
441 SET_FLAG(address->flags, IFA_F_MANAGETEMPADDR, link->network->dhcp_pd_manage_temporary_address);
442 address->route_metric = link->network->dhcp_pd_route_metric;
443 address->token = ipv6_token_ref(token);
444
445 r = free_and_strdup_warn(&address->netlabel, link->network->dhcp_pd_netlabel);
446 if (r < 0)
447 return r;
448
449 r = dhcp_pd_request_address_one(address, link);
450 if (r < 0)
451 return log_link_error_errno(link, r, "Failed to request DHCP delegated prefix address: %m");
452 }
453
454 return 0;
455 }
456
457 static int dhcp_pd_calculate_subnet_prefix(
458 const struct in6_addr *pd_prefix,
459 uint8_t pd_prefix_len,
460 uint64_t subnet_id,
461 struct in6_addr *ret) {
462
463 struct in6_addr prefix;
464
465 assert(pd_prefix);
466 assert(pd_prefix_len <= 64);
467 assert(ret);
468
469 if (subnet_id >= UINT64_C(1) << (64 - pd_prefix_len))
470 return -ERANGE;
471
472 prefix = *pd_prefix;
473
474 if (pd_prefix_len < 32)
475 prefix.s6_addr32[0] |= htobe32(subnet_id >> 32);
476
477 prefix.s6_addr32[1] |= htobe32(subnet_id & 0xffffffff);
478
479 *ret = prefix;
480 return 0;
481 }
482
483 static int dhcp_pd_get_preferred_subnet_prefix(
484 Link *link,
485 const struct in6_addr *pd_prefix,
486 uint8_t pd_prefix_len,
487 struct in6_addr *ret) {
488
489 struct in6_addr prefix;
490 Link *assigned_link;
491 int r;
492
493 assert(link);
494 assert(link->manager);
495 assert(link->network);
496 assert(pd_prefix);
497
498 if (link->network->dhcp_pd_subnet_id >= 0) {
499 /* If the link has a preference for a particular subnet id try to allocate that */
500
501 r = dhcp_pd_calculate_subnet_prefix(pd_prefix, pd_prefix_len, link->network->dhcp_pd_subnet_id, &prefix);
502 if (r < 0)
503 return log_link_warning_errno(link, r,
504 "subnet id %" PRIi64 " is out of range. Only have %" PRIu64 " subnets.",
505 link->network->dhcp_pd_subnet_id, UINT64_C(1) << (64 - pd_prefix_len));
506
507 *ret = prefix;
508 return 0;
509 }
510
511 if (dhcp_pd_get_assigned_subnet_prefix(link, pd_prefix, pd_prefix_len, ret) >= 0)
512 return 0;
513
514 for (uint64_t n = 0; ; n++) {
515 /* If we do not have an allocation preference just iterate
516 * through the address space and return the first free prefix. */
517
518 r = dhcp_pd_calculate_subnet_prefix(pd_prefix, pd_prefix_len, n, &prefix);
519 if (r < 0)
520 return log_link_warning_errno(link, r,
521 "Couldn't find a suitable prefix. Ran out of address space.");
522
523 /* Do not use explicitly requested subnet IDs. Note that the corresponding link may not
524 * appear yet. So, we need to check the ID is not used in any .network files. */
525 if (set_contains(link->manager->dhcp_pd_subnet_ids, &n))
526 continue;
527
528 /* Check that the prefix is not assigned to another link. */
529 if (link_get_by_dhcp_pd_subnet_prefix(link->manager, &prefix, &assigned_link) < 0 ||
530 assigned_link == link)
531 break;
532 }
533
534 r = link_add_dhcp_pd_subnet_prefix(link, &prefix);
535 if (r < 0)
536 return log_link_warning_errno(link, r, "Failed to save acquired free subnet prefix: %m");
537
538 *ret = prefix;
539 return 0;
540 }
541
542 static int dhcp_pd_assign_subnet_prefix(
543 Link *link,
544 const struct in6_addr *pd_prefix,
545 uint8_t pd_prefix_len,
546 usec_t lifetime_preferred_usec,
547 usec_t lifetime_valid_usec,
548 bool is_uplink) {
549
550 struct in6_addr prefix;
551 int r;
552
553 assert(link);
554 assert(link->network);
555 assert(pd_prefix);
556
557 r = dhcp_pd_get_preferred_subnet_prefix(link, pd_prefix, pd_prefix_len, &prefix);
558 if (r < 0)
559 return r == -ERANGE ? 0 : r;
560
561 const char *pretty = IN6_ADDR_PREFIX_TO_STRING(&prefix, 64);
562
563 if (link_radv_enabled(link) && link->network->dhcp_pd_announce) {
564 if (is_uplink)
565 log_link_debug(link, "Ignoring Announce= setting on upstream interface.");
566 else {
567 r = radv_add_prefix(link, &prefix, 64, lifetime_preferred_usec, lifetime_valid_usec);
568 if (r < 0)
569 return log_link_warning_errno(link, r,
570 "Failed to assign/update prefix %s to IPv6 Router Advertisement: %m",
571 pretty);
572 }
573 }
574
575 r = dhcp_pd_request_route(link, &prefix, lifetime_valid_usec);
576 if (r < 0)
577 return log_link_warning_errno(link, r,
578 "Failed to assign/update route for prefix %s: %m", pretty);
579
580 r = dhcp_pd_request_address(link, &prefix, lifetime_preferred_usec, lifetime_valid_usec);
581 if (r < 0)
582 return log_link_warning_errno(link, r,
583 "Failed to assign/update address for prefix %s: %m", pretty);
584
585 log_link_debug(link, "Assigned prefix %s", pretty);
586 return 1;
587 }
588
589 static int dhcp_pd_prepare(Link *link) {
590 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
591 return 0;
592
593 if (!link_dhcp_pd_is_enabled(link))
594 return 0;
595
596 if (link_radv_enabled(link) && link->network->dhcp_pd_announce && !link->radv)
597 return 0;
598
599 link_mark_addresses(link, NETWORK_CONFIG_SOURCE_DHCP_PD);
600 manager_mark_routes(link->manager, link, NETWORK_CONFIG_SOURCE_DHCP_PD);
601
602 return 1;
603 }
604
605 static int dhcp_pd_finalize(Link *link) {
606 int r;
607
608 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
609 return 0;
610
611 if (link->dhcp_pd_messages == 0) {
612 link->dhcp_pd_configured = false;
613
614 r = dhcp_pd_remove(link, /* only_marked = */ true);
615 if (r < 0)
616 return r;
617 }
618
619 if (!link->dhcp_pd_configured)
620 link_set_state(link, LINK_STATE_CONFIGURING);
621
622 link_check_ready(link);
623 return 0;
624 }
625
626 static void dhcp_pd_mark_unreachable_route(Manager *manager, NetworkConfigSource source) {
627 assert(manager);
628
629 Route *route;
630 SET_FOREACH(route, manager->routes) {
631 if (route->source != source)
632 continue;
633 if (route->family != AF_INET6)
634 continue;
635 if (route->nexthop.ifindex != 0) /* IPv6 unreachable has 0 ifindex. */
636 continue;
637 if (!route_type_is_reject(route->type))
638 continue;
639
640 route_mark(route);
641 }
642 }
643
644 static int dhcp_pd_remove_unreachable_route(Manager *manager, NetworkConfigSource source, bool only_marked) {
645 int ret = 0;
646
647 assert(manager);
648
649 Route *route;
650 SET_FOREACH(route, manager->routes) {
651 if (route->source != source)
652 continue;
653 if (route->family != AF_INET6)
654 continue;
655 if (route->nexthop.ifindex != 0) /* IPv6 unreachable has 0 ifindex. */
656 continue;
657 if (!route_type_is_reject(route->type))
658 continue;
659 if (only_marked && !route_is_marked(route))
660 continue;
661
662 RET_GATHER(ret, route_remove_and_cancel(route, manager));
663 }
664
665 return ret;
666 }
667
668 static void dhcp_pd_prefix_lost(Link *uplink, NetworkConfigSource source) {
669 Link *link;
670 int r;
671
672 assert(uplink);
673 assert(uplink->manager);
674
675 HASHMAP_FOREACH(link, uplink->manager->links_by_index) {
676 if (!dhcp_pd_is_uplink(link, uplink, /* accept_auto = */ true))
677 continue;
678
679 r = dhcp_pd_remove(link, /* only_marked = */ false);
680 if (r < 0)
681 link_enter_failed(link);
682 }
683
684 (void) dhcp_pd_remove_unreachable_route(uplink->manager, source, /* only_marked = */ false);
685
686 set_clear(uplink->dhcp_pd_prefixes);
687 }
688
689 void dhcp4_pd_prefix_lost(Link *uplink) {
690 Link *tunnel;
691
692 assert(uplink);
693 assert(uplink->manager);
694
695 dhcp_pd_prefix_lost(uplink, NETWORK_CONFIG_SOURCE_DHCP4);
696
697 if (uplink->dhcp4_6rd_tunnel_name &&
698 link_get_by_name(uplink->manager, uplink->dhcp4_6rd_tunnel_name, &tunnel) >= 0)
699 (void) link_remove(tunnel);
700 }
701
702 void dhcp6_pd_prefix_lost(Link *uplink) {
703 dhcp_pd_prefix_lost(uplink, NETWORK_CONFIG_SOURCE_DHCP6);
704 }
705
706 static int dhcp4_unreachable_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Route *route) {
707 int r;
708
709 assert(req);
710 assert(link);
711 assert(route);
712
713 r = route_configure_handler_internal(m, req, route);
714 if (r <= 0)
715 return r;
716
717 r = dhcp4_check_ready(link);
718 if (r < 0)
719 link_enter_failed(link);
720
721 return 1;
722 }
723
724 static int dhcp6_unreachable_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Route *route) {
725 int r;
726
727 assert(req);
728 assert(link);
729 assert(route);
730
731 r = route_configure_handler_internal(m, req, route);
732 if (r <= 0)
733 return r;
734
735 r = dhcp6_check_ready(link);
736 if (r < 0)
737 link_enter_failed(link);
738
739 return 1;
740 }
741
742 static int dhcp_request_unreachable_route(
743 Link *link,
744 const struct in6_addr *addr,
745 uint8_t prefixlen,
746 usec_t lifetime_usec,
747 NetworkConfigSource source,
748 const union in_addr_union *server_address,
749 uint8_t type, /* RTN_* */
750 unsigned *counter,
751 route_netlink_handler_t callback,
752 bool *configured) {
753
754 _cleanup_(route_unrefp) Route *route = NULL;
755 Route *existing;
756 int r;
757
758 assert(link);
759 assert(link->manager);
760 assert(addr);
761 assert(IN_SET(source, NETWORK_CONFIG_SOURCE_DHCP4, NETWORK_CONFIG_SOURCE_DHCP6));
762 assert(server_address);
763 assert(type == RTN_UNSPEC || route_type_is_reject(type));
764 assert(counter);
765 assert(callback);
766 assert(configured);
767
768 if (type == RTN_UNSPEC)
769 return 0; /* Disabled. */
770
771 if (prefixlen >= 64) {
772 log_link_debug(link, "Not adding a blocking route for DHCP delegated prefix %s since the prefix has length >= 64.",
773 IN6_ADDR_PREFIX_TO_STRING(addr, prefixlen));
774 return 0;
775 }
776
777 r = route_new(&route);
778 if (r < 0)
779 return log_oom();
780
781 route->source = source;
782 route->provider = *server_address;
783 route->family = AF_INET6;
784 route->dst.in6 = *addr;
785 route->dst_prefixlen = prefixlen;
786 route->type = type;
787 route->protocol = RTPROT_DHCP;
788 route->priority = IP6_RT_PRIO_USER;
789 route->lifetime_usec = lifetime_usec;
790
791 r = route_adjust_nexthops(route, link);
792 if (r < 0)
793 return r;
794
795 if (route_get(link->manager, route, &existing) < 0)
796 *configured = false;
797 else
798 route_unmark(existing);
799
800 r = link_request_route(link, route, counter, callback);
801 if (r < 0)
802 return log_link_error_errno(link, r, "Failed to request unreachable route for DHCP delegated prefix %s: %m",
803 IN6_ADDR_PREFIX_TO_STRING(addr, prefixlen));
804
805 return 0;
806 }
807
808 static int dhcp4_request_unreachable_route(
809 Link *link,
810 const struct in6_addr *addr,
811 uint8_t prefixlen,
812 usec_t lifetime_usec,
813 const union in_addr_union *server_address) {
814
815 assert(link);
816 assert(link->network);
817
818 return dhcp_request_unreachable_route(link, addr, prefixlen, lifetime_usec,
819 NETWORK_CONFIG_SOURCE_DHCP4, server_address,
820 link->network->dhcp_6rd_prefix_route_type,
821 &link->dhcp4_messages, dhcp4_unreachable_route_handler,
822 &link->dhcp4_configured);
823 }
824
825 static int dhcp6_request_unreachable_route(
826 Link *link,
827 const struct in6_addr *addr,
828 uint8_t prefixlen,
829 usec_t lifetime_usec,
830 const union in_addr_union *server_address) {
831
832 assert(link);
833 assert(link->network);
834
835 return dhcp_request_unreachable_route(link, addr, prefixlen, lifetime_usec,
836 NETWORK_CONFIG_SOURCE_DHCP6, server_address,
837 link->network->dhcp6_pd_prefix_route_type,
838 &link->dhcp6_messages, dhcp6_unreachable_route_handler,
839 &link->dhcp6_configured);
840 }
841
842 static int dhcp_pd_prefix_add(Link *link, const struct in6_addr *prefix, uint8_t prefixlen) {
843 struct in_addr_prefix *p;
844 int r;
845
846 assert(link);
847 assert(prefix);
848
849 p = new(struct in_addr_prefix, 1);
850 if (!p)
851 return log_oom();
852
853 *p = (struct in_addr_prefix) {
854 .family = AF_INET6,
855 .prefixlen = prefixlen,
856 .address.in6 = *prefix,
857 };
858
859 int log_level = set_contains(link->dhcp_pd_prefixes, p) ? LOG_DEBUG :
860 prefixlen > 64 || prefixlen < 48 ? LOG_WARNING : LOG_INFO;
861 log_link_full(link,
862 log_level,
863 "DHCP: received delegated prefix %s%s",
864 IN6_ADDR_PREFIX_TO_STRING(prefix, prefixlen),
865 prefixlen > 64 ? " with prefix length > 64, ignoring." :
866 prefixlen < 48 ? " with prefix length < 48, looks unusual.": "");
867
868 /* Store PD prefix even if prefixlen > 64, not to make logged at warning level so frequently. */
869 r = set_ensure_consume(&link->dhcp_pd_prefixes, &in_addr_prefix_hash_ops_free, p);
870 if (r < 0)
871 return log_link_error_errno(link, r, "Failed to store DHCP delegated prefix %s: %m",
872 IN6_ADDR_PREFIX_TO_STRING(prefix, prefixlen));
873 return 0;
874 }
875
876 static int dhcp4_pd_request_default_gateway_on_6rd_tunnel(Link *link, const struct in_addr *br_address, usec_t lifetime_usec) {
877 _cleanup_(route_unrefp) Route *route = NULL;
878 Route *existing;
879 int r;
880
881 assert(link);
882 assert(link->manager);
883 assert(br_address);
884
885 r = route_new(&route);
886 if (r < 0)
887 return log_link_debug_errno(link, r, "Failed to allocate default gateway for DHCP delegated prefix: %m");
888
889 route->source = NETWORK_CONFIG_SOURCE_DHCP_PD;
890 route->family = AF_INET6;
891 route->nexthop.family = AF_INET6;
892 route->nexthop.gw.in6.s6_addr32[3] = br_address->s_addr;
893 route->scope = RT_SCOPE_UNIVERSE;
894 route->protocol = RTPROT_DHCP;
895 route->priority = IP6_RT_PRIO_USER;
896 route->lifetime_usec = lifetime_usec;
897
898 r = route_adjust_nexthops(route, link);
899 if (r < 0)
900 return r;
901
902 if (route_get(link->manager, route, &existing) < 0) /* This is a new route. */
903 link->dhcp_pd_configured = false;
904 else
905 route_unmark(existing);
906
907 r = link_request_route(link, route, &link->dhcp_pd_messages, dhcp_pd_route_handler);
908 if (r < 0)
909 return log_link_debug_errno(link, r, "Failed to request default gateway for DHCP delegated prefix: %m");
910
911 return 0;
912 }
913
914 static void dhcp4_calculate_pd_prefix(
915 const struct in_addr *ipv4address,
916 uint8_t ipv4masklen,
917 const struct in6_addr *sixrd_prefix,
918 uint8_t sixrd_prefixlen,
919 struct in6_addr *ret_pd_prefix,
920 uint8_t *ret_pd_prefixlen) {
921
922 struct in6_addr pd_prefix;
923
924 assert(ipv4address);
925 assert(ipv4masklen <= 32);
926 assert(sixrd_prefix);
927 assert(32 - ipv4masklen + sixrd_prefixlen <= 128);
928 assert(ret_pd_prefix);
929
930 pd_prefix = *sixrd_prefix;
931 for (unsigned i = 0; i < (unsigned) (32 - ipv4masklen); i++)
932 if (ipv4address->s_addr & htobe32(UINT32_C(1) << (32 - ipv4masklen - i - 1)))
933 pd_prefix.s6_addr[(i + sixrd_prefixlen) / 8] |= 1 << (7 - (i + sixrd_prefixlen) % 8);
934
935 *ret_pd_prefix = pd_prefix;
936 if (ret_pd_prefixlen)
937 *ret_pd_prefixlen = 32 - ipv4masklen + sixrd_prefixlen;
938 }
939
940 static int dhcp4_pd_assign_subnet_prefix(Link *link, Link *uplink) {
941 uint8_t ipv4masklen, sixrd_prefixlen, pd_prefixlen;
942 struct in6_addr sixrd_prefix, pd_prefix;
943 const struct in_addr *br_addresses;
944 struct in_addr ipv4address;
945 usec_t lifetime_usec;
946 int r;
947
948 assert(link);
949 assert(uplink);
950 assert(uplink->manager);
951 assert(uplink->dhcp_lease);
952
953 r = sd_dhcp_lease_get_address(uplink->dhcp_lease, &ipv4address);
954 if (r < 0)
955 return log_link_warning_errno(uplink, r, "Failed to get DHCPv4 address: %m");
956
957 r = sd_dhcp_lease_get_lifetime_timestamp(uplink->dhcp_lease, CLOCK_BOOTTIME, &lifetime_usec);
958 if (r < 0)
959 return log_link_warning_errno(uplink, r, "Failed to get lifetime of DHCPv4 lease: %m");
960
961 r = sd_dhcp_lease_get_6rd(uplink->dhcp_lease, &ipv4masklen, &sixrd_prefixlen, &sixrd_prefix, &br_addresses, NULL);
962 if (r < 0)
963 return log_link_warning_errno(uplink, r, "Failed to get DHCPv4 6rd option: %m");
964
965 dhcp4_calculate_pd_prefix(&ipv4address, ipv4masklen, &sixrd_prefix, sixrd_prefixlen, &pd_prefix, &pd_prefixlen);
966
967 if (pd_prefixlen > 64)
968 return 0;
969
970 r = dhcp_pd_prepare(link);
971 if (r <= 0)
972 return r;
973
974 if (streq_ptr(uplink->dhcp4_6rd_tunnel_name, link->ifname)) {
975 r = dhcp4_pd_request_default_gateway_on_6rd_tunnel(link, &br_addresses[0], lifetime_usec);
976 if (r < 0)
977 return r;
978 }
979
980 r = dhcp_pd_assign_subnet_prefix(link, &pd_prefix, pd_prefixlen, lifetime_usec, lifetime_usec, /* is_uplink = */ false);
981 if (r < 0)
982 return r;
983
984 return dhcp_pd_finalize(link);
985 }
986
987 static int dhcp4_pd_6rd_tunnel_create_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
988 int r;
989
990 assert(m);
991 assert(link);
992 assert(link->manager);
993 assert(link->dhcp4_6rd_tunnel_name);
994
995 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
996 return 0;
997
998 r = sd_netlink_message_get_errno(m);
999 if (r < 0) {
1000 log_link_message_warning_errno(link, m, r, "Failed to create tunnel device for DHCPv4 6rd");
1001 link_enter_failed(link);
1002 return 0;
1003 }
1004
1005 return 0;
1006 }
1007
1008 int dhcp4_pd_prefix_acquired(Link *uplink) {
1009 uint8_t ipv4masklen, sixrd_prefixlen, pd_prefixlen;
1010 struct in6_addr sixrd_prefix, pd_prefix;
1011 struct in_addr ipv4address;
1012 union in_addr_union server_address;
1013 const struct in_addr *br_addresses;
1014 usec_t lifetime_usec;
1015 Link *link;
1016 int r;
1017
1018 assert(uplink);
1019 assert(uplink->manager);
1020 assert(uplink->dhcp_lease);
1021
1022 r = sd_dhcp_lease_get_address(uplink->dhcp_lease, &ipv4address);
1023 if (r < 0)
1024 return log_link_warning_errno(uplink, r, "Failed to get DHCPv4 address: %m");
1025
1026 r = sd_dhcp_lease_get_lifetime_timestamp(uplink->dhcp_lease, CLOCK_BOOTTIME, &lifetime_usec);
1027 if (r < 0)
1028 return log_link_warning_errno(uplink, r, "Failed to get lifetime of DHCPv4 lease: %m");
1029
1030 r = sd_dhcp_lease_get_server_identifier(uplink->dhcp_lease, &server_address.in);
1031 if (r < 0)
1032 return log_link_warning_errno(uplink, r, "Failed to get server address of DHCPv4 lease: %m");
1033
1034 r = sd_dhcp_lease_get_6rd(uplink->dhcp_lease, &ipv4masklen, &sixrd_prefixlen, &sixrd_prefix, &br_addresses, NULL);
1035 if (r < 0)
1036 return log_link_warning_errno(uplink, r, "Failed to get DHCPv4 6rd option: %m");
1037
1038 if (DEBUG_LOGGING)
1039 log_link_debug(uplink, "DHCPv4: 6rd option is acquired: IPv4_masklen=%u, 6rd_prefix=%s, br_address="IPV4_ADDRESS_FMT_STR,
1040 ipv4masklen,
1041 IN6_ADDR_PREFIX_TO_STRING(&sixrd_prefix, sixrd_prefixlen),
1042 IPV4_ADDRESS_FMT_VAL(*br_addresses));
1043
1044 /* Calculate PD prefix */
1045 dhcp4_calculate_pd_prefix(&ipv4address, ipv4masklen, &sixrd_prefix, sixrd_prefixlen, &pd_prefix, &pd_prefixlen);
1046
1047 /* Register and log PD prefix */
1048 r = dhcp_pd_prefix_add(uplink, &pd_prefix, pd_prefixlen);
1049 if (r < 0)
1050 return r;
1051
1052 /* Request unreachable route */
1053 dhcp_pd_mark_unreachable_route(uplink->manager, NETWORK_CONFIG_SOURCE_DHCP4);
1054 r = dhcp4_request_unreachable_route(uplink, &pd_prefix, pd_prefixlen, lifetime_usec, &server_address);
1055 if (r < 0)
1056 return r;
1057 (void) dhcp_pd_remove_unreachable_route(uplink->manager, NETWORK_CONFIG_SOURCE_DHCP4, /* only_marked = */ true);
1058
1059 /* Create or update 6rd SIT tunnel device. */
1060 r = dhcp4_pd_create_6rd_tunnel(uplink, dhcp4_pd_6rd_tunnel_create_handler);
1061 if (r < 0)
1062 return log_link_warning_errno(uplink, r, "Failed to create or update 6rd SIT tunnel: %m");
1063
1064 /* Then, assign subnet prefixes to downstream interfaces. */
1065 HASHMAP_FOREACH(link, uplink->manager->links_by_index) {
1066 if (!dhcp_pd_is_uplink(link, uplink, /* accept_auto = */ true))
1067 continue;
1068
1069 r = dhcp4_pd_assign_subnet_prefix(link, uplink);
1070 if (r < 0) {
1071 /* When failed on the upstream interface (i.e., the case link == uplink),
1072 * immediately abort the assignment of the prefixes. As, the all assigned
1073 * prefixes will be dropped soon in link_enter_failed(), and it is meaningless
1074 * to continue the assignment. */
1075 if (link == uplink)
1076 return r;
1077
1078 link_enter_failed(link);
1079 }
1080 }
1081
1082 return 0;
1083 }
1084
1085 static int dhcp6_pd_assign_subnet_prefixes(Link *link, Link *uplink) {
1086 int r;
1087
1088 assert(link);
1089 assert(uplink);
1090 assert(uplink->dhcp6_lease);
1091
1092 r = dhcp_pd_prepare(link);
1093 if (r <= 0)
1094 return r;
1095
1096 FOREACH_DHCP6_PD_PREFIX(uplink->dhcp6_lease) {
1097 usec_t lifetime_preferred_usec, lifetime_valid_usec;
1098 struct in6_addr pd_prefix;
1099 uint8_t pd_prefix_len;
1100
1101 r = sd_dhcp6_lease_get_pd_prefix(uplink->dhcp6_lease, &pd_prefix, &pd_prefix_len);
1102 if (r < 0)
1103 return r;
1104
1105 if (pd_prefix_len > 64)
1106 continue;
1107
1108 /* Mask prefix for safety. */
1109 r = in6_addr_mask(&pd_prefix, pd_prefix_len);
1110 if (r < 0)
1111 return r;
1112
1113 r = sd_dhcp6_lease_get_pd_lifetime_timestamp(uplink->dhcp6_lease, CLOCK_BOOTTIME,
1114 &lifetime_preferred_usec, &lifetime_valid_usec);
1115 if (r < 0)
1116 return r;
1117
1118 r = dhcp_pd_assign_subnet_prefix(link, &pd_prefix, pd_prefix_len,
1119 lifetime_preferred_usec, lifetime_valid_usec,
1120 /* is_uplink = */ link == uplink);
1121 if (r < 0)
1122 return r;
1123 }
1124
1125 return dhcp_pd_finalize(link);
1126 }
1127
1128 int dhcp6_pd_prefix_acquired(Link *uplink) {
1129 union in_addr_union server_address;
1130 Link *link;
1131 int r;
1132
1133 assert(uplink);
1134 assert(uplink->dhcp6_lease);
1135 assert(uplink->manager);
1136
1137 r = sd_dhcp6_lease_get_server_address(uplink->dhcp6_lease, &server_address.in6);
1138 if (r < 0)
1139 return log_link_warning_errno(uplink, r, "Failed to get server address of DHCPv6 lease: %m");
1140
1141 dhcp_pd_mark_unreachable_route(uplink->manager, NETWORK_CONFIG_SOURCE_DHCP6);
1142
1143 /* First, logs acquired prefixes and request unreachable routes. */
1144 FOREACH_DHCP6_PD_PREFIX(uplink->dhcp6_lease) {
1145 usec_t lifetime_valid_usec;
1146 struct in6_addr pd_prefix;
1147 uint8_t pd_prefix_len;
1148
1149 r = sd_dhcp6_lease_get_pd_prefix(uplink->dhcp6_lease, &pd_prefix, &pd_prefix_len);
1150 if (r < 0)
1151 return r;
1152
1153 /* Mask prefix for safety. */
1154 r = in6_addr_mask(&pd_prefix, pd_prefix_len);
1155 if (r < 0)
1156 return log_link_error_errno(uplink, r, "Failed to mask DHCPv6 delegated prefix: %m");
1157
1158 r = dhcp_pd_prefix_add(uplink, &pd_prefix, pd_prefix_len);
1159 if (r < 0)
1160 return r;
1161
1162 r = sd_dhcp6_lease_get_pd_lifetime_timestamp(uplink->dhcp6_lease, CLOCK_BOOTTIME,
1163 NULL, &lifetime_valid_usec);
1164 if (r < 0)
1165 return r;
1166
1167 r = dhcp6_request_unreachable_route(uplink, &pd_prefix, pd_prefix_len,
1168 lifetime_valid_usec, &server_address);
1169 if (r < 0)
1170 return r;
1171 }
1172
1173 (void) dhcp_pd_remove_unreachable_route(uplink->manager, NETWORK_CONFIG_SOURCE_DHCP6, /* only_marked = */ true);
1174
1175 /* Then, assign subnet prefixes. */
1176 HASHMAP_FOREACH(link, uplink->manager->links_by_index) {
1177 if (!dhcp_pd_is_uplink(link, uplink, /* accept_auto = */ true))
1178 continue;
1179
1180 r = dhcp6_pd_assign_subnet_prefixes(link, uplink);
1181 if (r < 0) {
1182 /* When failed on the upstream interface (i.e., the case link == uplink),
1183 * immediately abort the assignment of the prefixes. As, the all assigned
1184 * prefixes will be dropped soon in link_enter_failed(), and it is meaningless
1185 * to continue the assignment. */
1186 if (link == uplink)
1187 return r;
1188
1189 link_enter_failed(link);
1190 }
1191 }
1192
1193 return 0;
1194 }
1195
1196 static bool dhcp4_pd_uplink_is_ready(Link *link) {
1197 assert(link);
1198
1199 if (!link->network)
1200 return false;
1201
1202 if (!link->network->dhcp_use_6rd)
1203 return false;
1204
1205 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
1206 return false;
1207
1208 if (!link->dhcp_client)
1209 return false;
1210
1211 if (sd_dhcp_client_is_running(link->dhcp_client) <= 0)
1212 return false;
1213
1214 return sd_dhcp_lease_has_6rd(link->dhcp_lease);
1215 }
1216
1217 static bool dhcp6_pd_uplink_is_ready(Link *link) {
1218 assert(link);
1219
1220 if (!link->network)
1221 return false;
1222
1223 if (!link->network->dhcp6_use_pd_prefix)
1224 return false;
1225
1226 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
1227 return false;
1228
1229 if (!link->dhcp6_client)
1230 return false;
1231
1232 if (sd_dhcp6_client_is_running(link->dhcp6_client) <= 0)
1233 return false;
1234
1235 return sd_dhcp6_lease_has_pd_prefix(link->dhcp6_lease);
1236 }
1237
1238 int dhcp_pd_find_uplink(Link *link, Link **ret) {
1239 Link *uplink = NULL;
1240 int r = 0;
1241
1242 assert(link);
1243 assert(link->manager);
1244 assert(link_dhcp_pd_is_enabled(link));
1245 assert(ret);
1246
1247 if (link->network->dhcp_pd_uplink_name)
1248 r = link_get_by_name(link->manager, link->network->dhcp_pd_uplink_name, &uplink);
1249 else if (link->network->dhcp_pd_uplink_index > 0)
1250 r = link_get_by_index(link->manager, link->network->dhcp_pd_uplink_index, &uplink);
1251 else if (link->network->dhcp_pd_uplink_index == UPLINK_INDEX_SELF)
1252 uplink = link;
1253 if (r < 0)
1254 return r;
1255
1256 if (uplink) {
1257 if (dhcp4_pd_uplink_is_ready(uplink)) {
1258 *ret = uplink;
1259 return AF_INET;
1260 }
1261
1262 if (dhcp6_pd_uplink_is_ready(uplink)) {
1263 *ret = uplink;
1264 return AF_INET6;
1265 }
1266
1267 return -EBUSY;
1268 }
1269
1270 HASHMAP_FOREACH(uplink, link->manager->links_by_index) {
1271 /* Assume that there exists at most one link which acquired delegated prefixes. */
1272 if (dhcp4_pd_uplink_is_ready(uplink)) {
1273 *ret = uplink;
1274 return AF_INET;
1275 }
1276
1277 if (dhcp6_pd_uplink_is_ready(uplink)) {
1278 *ret = uplink;
1279 return AF_INET6;
1280 }
1281 }
1282
1283 return -ENODEV;
1284 }
1285
1286 int dhcp_request_prefix_delegation(Link *link) {
1287 Link *uplink;
1288 int r;
1289
1290 assert(link);
1291
1292 if (!link_dhcp_pd_is_enabled(link))
1293 return 0;
1294
1295 r = dhcp_pd_find_uplink(link, &uplink);
1296 if (r < 0)
1297 return 0;
1298
1299 log_link_debug(link, "Requesting subnets of delegated prefixes acquired by DHCPv%c client on %s",
1300 r == AF_INET ? '4' : '6', uplink->ifname);
1301
1302 return r == AF_INET ?
1303 dhcp4_pd_assign_subnet_prefix(link, uplink) :
1304 dhcp6_pd_assign_subnet_prefixes(link, uplink);
1305 }
1306
1307 int link_drop_dhcp_pd_config(Link *link, Network *network) {
1308 assert(link);
1309 assert(link->network);
1310
1311 if (link->network == network)
1312 return 0; /* .network file is unchanged. It is not necessary to reconfigure the client. */
1313
1314 if (!link_dhcp_pd_is_enabled(link)) /* Disabled now, drop all configs. */
1315 return dhcp_pd_remove(link, /* only_marked = */ false);
1316
1317 /* If previously explicitly disabled, then there is nothing we need to drop.
1318 * If this is called on start up, we do not know the previous settings, assume nothing changed. */
1319 if (!network || !network->dhcp_pd)
1320 return 0;
1321
1322 /* If at least one setting is changed, then drop all configurations. */
1323 if (link->network->dhcp_pd_assign != network->dhcp_pd_assign ||
1324 (link->network->dhcp_pd_assign &&
1325 (link->network->dhcp_pd_manage_temporary_address != network->dhcp_pd_manage_temporary_address ||
1326 !set_equal(link->network->dhcp_pd_tokens, network->dhcp_pd_tokens))) ||
1327 link->network->dhcp_pd_subnet_id != network->dhcp_pd_subnet_id ||
1328 link->network->dhcp_pd_route_metric != network->dhcp_pd_route_metric ||
1329 link->network->dhcp_pd_uplink_index != network->dhcp_pd_uplink_index ||
1330 !streq_ptr(link->network->dhcp_pd_uplink_name, network->dhcp_pd_uplink_name))
1331 return dhcp_pd_remove(link, /* only_marked = */ false);
1332
1333 return 0;
1334 }
1335
1336 int config_parse_dhcp_pd_subnet_id(
1337 const char *unit,
1338 const char *filename,
1339 unsigned line,
1340 const char *section,
1341 unsigned section_line,
1342 const char *lvalue,
1343 int ltype,
1344 const char *rvalue,
1345 void *data,
1346 void *userdata) {
1347
1348 int64_t *p = ASSERT_PTR(data);
1349 uint64_t t;
1350 int r;
1351
1352 assert(filename);
1353 assert(lvalue);
1354 assert(rvalue);
1355
1356 if (isempty(rvalue) || streq(rvalue, "auto")) {
1357 *p = -1;
1358 return 0;
1359 }
1360
1361 r = safe_atoux64(rvalue, &t);
1362 if (r < 0) {
1363 log_syntax(unit, LOG_WARNING, filename, line, r,
1364 "Failed to parse %s=, ignoring assignment: %s",
1365 lvalue, rvalue);
1366 return 0;
1367 }
1368 if (t > INT64_MAX) {
1369 log_syntax(unit, LOG_WARNING, filename, line, 0,
1370 "Invalid subnet id '%s', ignoring assignment.",
1371 rvalue);
1372 return 0;
1373 }
1374
1375 *p = (int64_t) t;
1376
1377 return 0;
1378 }
1379
1380 int config_parse_dhcp_pd_prefix_route_type(
1381 const char *unit,
1382 const char *filename,
1383 unsigned line,
1384 const char *section,
1385 unsigned section_line,
1386 const char *lvalue,
1387 int ltype,
1388 const char *rvalue,
1389 void *data,
1390 void *userdata) {
1391
1392 uint8_t *p = ASSERT_PTR(data);
1393 int r;
1394
1395 assert(filename);
1396 assert(lvalue);
1397 assert(rvalue);
1398
1399 if (isempty(rvalue)) {
1400 *p = RTN_UNREACHABLE; /* Defaults to unreachable. */
1401 return 0;
1402 }
1403
1404 if (streq(rvalue, "none")) {
1405 *p = RTN_UNSPEC; /* Indicate that the route is disabled. */
1406 return 0;
1407 }
1408
1409 r = route_type_from_string(rvalue);
1410 if (r < 0) {
1411 log_syntax(unit, LOG_WARNING, filename, line, r,
1412 "Failed to parse %s=, ignoring assignment: %s",
1413 lvalue, rvalue);
1414 return 0;
1415 }
1416
1417 if (!route_type_is_reject(r)) {
1418 log_syntax(unit, LOG_WARNING, filename, line, 0,
1419 "Invalid route type is specified to %s=, ignoring assignment: %s",
1420 lvalue, rvalue);
1421 return 0;
1422 }
1423
1424 *p = r;
1425 return 0;
1426 }
Unnamed repository; edit this file 'description' to name the repository.