src/network/networkd-dhcp6.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2 /***
   3   Copyright © 2014 Intel Corporation. All rights reserved.
   4 ***/
   5
   6 #include "sd-dhcp6-client.h"
   7
   8 #include "hashmap.h"
   9 #include "hostname-setup.h"
  10 #include "hostname-util.h"
  11 #include "networkd-address.h"
  12 #include "networkd-dhcp-prefix-delegation.h"
  13 #include "networkd-dhcp6.h"
  14 #include "networkd-link.h"
  15 #include "networkd-manager.h"
  16 #include "networkd-queue.h"
  17 #include "networkd-route.h"
  18 #include "string-table.h"
  19 #include "string-util.h"
  20
  21 bool link_dhcp6_with_address_enabled(Link *link) {
  22         if (!link_dhcp6_enabled(link))
  23                 return false;
  24
  25         return link->network->dhcp6_use_address;
  26 }
  27
  28 static DHCP6ClientStartMode link_get_dhcp6_client_start_mode(Link *link) {
  29         assert(link);
  30
  31         if (!link->network)
  32                 return DHCP6_CLIENT_START_MODE_NO;
  33
  34         /* When WithoutRA= is explicitly specified, then honor it. */
  35         if (link->network->dhcp6_client_start_mode >= 0)
  36                 return link->network->dhcp6_client_start_mode;
  37
  38         /* When this interface itself is an uplink interface, then start dhcp6 client in solicit mode. */
  39         if (dhcp_pd_is_uplink(link, link, /* accept_auto = */ false))
  40                 return DHCP6_CLIENT_START_MODE_SOLICIT;
  41
  42         /* Otherwise, start dhcp6 client when RA is received. */
  43         return DHCP6_CLIENT_START_MODE_NO;
  44 }
  45
  46 static int dhcp6_remove(Link *link, bool only_marked) {
  47         Address *address;
  48         Route *route;
  49         int k, r = 0;
  50
  51         assert(link);
  52
  53         if (!only_marked)
  54                 link->dhcp6_configured = false;
  55
  56         SET_FOREACH(route, link->routes) {
  57                 if (route->source != NETWORK_CONFIG_SOURCE_DHCP6)
  58                         continue;
  59                 if (only_marked && !route_is_marked(route))
  60                         continue;
  61
  62                 k = route_remove(route);
  63                 if (k < 0)
  64                         r = k;
  65
  66                 route_cancel_request(route, link);
  67         }
  68
  69         SET_FOREACH(address, link->addresses) {
  70                 if (address->source != NETWORK_CONFIG_SOURCE_DHCP6)
  71                         continue;
  72                 if (only_marked && !address_is_marked(address))
  73                         continue;
  74
  75                 k = address_remove(address);
  76                 if (k < 0)
  77                         r = k;
  78
  79                 address_cancel_request(address);
  80         }
  81
  82         return r;
  83 }
  84
  85 static int dhcp6_address_ready_callback(Address *address) {
  86         Address *a;
  87
  88         assert(address);
  89         assert(address->link);
  90
  91         SET_FOREACH(a, address->link->addresses)
  92                 if (a->source == NETWORK_CONFIG_SOURCE_DHCP6)
  93                         a->callback = NULL;
  94
  95         return dhcp6_check_ready(address->link);
  96 }
  97
  98 int dhcp6_check_ready(Link *link) {
  99         bool has_ready = false;
 100         Address *address;
 101         int r;
 102
 103         assert(link);
 104
 105         if (link->dhcp6_messages > 0) {
 106                 log_link_debug(link, "%s(): DHCPv6 addresses and routes are not set.", __func__);
 107                 return 0;
 108         }
 109
 110         SET_FOREACH(address, link->addresses) {
 111                 if (address->source != NETWORK_CONFIG_SOURCE_DHCP6)
 112                         continue;
 113                 if (address_is_ready(address)) {
 114                         has_ready = true;
 115                         break;
 116                 }
 117         }
 118
 119         if (!has_ready) {
 120                 SET_FOREACH(address, link->addresses)
 121                         if (address->source == NETWORK_CONFIG_SOURCE_DHCP6)
 122                                 address->callback = dhcp6_address_ready_callback;
 123
 124                 log_link_debug(link, "%s(): no DHCPv6 address is ready.", __func__);
 125                 return 0;
 126         }
 127
 128         link->dhcp6_configured = true;
 129         log_link_debug(link, "DHCPv6 addresses and routes set.");
 130
 131         r = dhcp6_remove(link, /* only_marked = */ true);
 132         if (r < 0)
 133                 return r;
 134
 135         link_check_ready(link);
 136         return 0;
 137 }
 138
 139 static int dhcp6_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Address *address) {
 140         int r;
 141
 142         assert(link);
 143
 144         r = address_configure_handler_internal(rtnl, m, link, "Could not set DHCPv6 address");
 145         if (r <= 0)
 146                 return r;
 147
 148         r = dhcp6_check_ready(link);
 149         if (r < 0)
 150                 link_enter_failed(link);
 151
 152         return 1;
 153 }
 154
 155 static int verify_dhcp6_address(Link *link, const Address *address) {
 156         bool by_ndisc = false;
 157         Address *existing;
 158         int log_level;
 159
 160         assert(link);
 161         assert(address);
 162         assert(address->family == AF_INET6);
 163
 164         const char *pretty = IN6_ADDR_TO_STRING(&address->in_addr.in6);
 165
 166         if (address_get(link, address, &existing) < 0 &&
 167             link_get_address(link, AF_INET6, &address->in_addr, 0, &existing) < 0) {
 168                 /* New address. */
 169                 log_level = LOG_INFO;
 170                 goto simple_log;
 171         } else
 172                 log_level = LOG_DEBUG;
 173
 174         if (address->prefixlen == existing->prefixlen)
 175                 /* Currently, only conflict in prefix length is reported. */
 176                 goto simple_log;
 177
 178         if (existing->source == NETWORK_CONFIG_SOURCE_NDISC)
 179                 by_ndisc = true;
 180
 181         log_link_warning(link, "Ignoring DHCPv6 address %s/%u (valid %s, preferred %s) which conflicts with %s/%u%s.",
 182                          pretty, address->prefixlen,
 183                          FORMAT_LIFETIME(address->lifetime_valid_usec),
 184                          FORMAT_LIFETIME(address->lifetime_preferred_usec),
 185                          pretty, existing->prefixlen,
 186                          by_ndisc ? " assigned by NDisc" : "");
 187         if (by_ndisc)
 188                 log_link_warning(link, "Hint: use IPv6Token= setting to change the address generated by NDisc or set UseAutonomousPrefix=no.");
 189
 190         return -EEXIST;
 191
 192 simple_log:
 193         log_link_full(link, log_level, "DHCPv6 address %s/%u (valid %s, preferred %s)",
 194                       pretty, address->prefixlen,
 195                       FORMAT_LIFETIME(address->lifetime_valid_usec),
 196                       FORMAT_LIFETIME(address->lifetime_preferred_usec));
 197         return 0;
 198 }
 199
 200 static int dhcp6_request_address(
 201                 Link *link,
 202                 const struct in6_addr *server_address,
 203                 const struct in6_addr *ip6_addr,
 204                 usec_t lifetime_preferred_usec,
 205                 usec_t lifetime_valid_usec) {
 206
 207         _cleanup_(address_freep) Address *addr = NULL;
 208         Address *existing;
 209         int r;
 210
 211         r = address_new(&addr);
 212         if (r < 0)
 213                 return log_oom();
 214
 215         addr->source = NETWORK_CONFIG_SOURCE_DHCP6;
 216         addr->provider.in6 = *server_address;
 217         addr->family = AF_INET6;
 218         addr->in_addr.in6 = *ip6_addr;
 219         addr->flags = IFA_F_NOPREFIXROUTE;
 220         addr->prefixlen = 128;
 221         addr->lifetime_preferred_usec = lifetime_preferred_usec;
 222         addr->lifetime_valid_usec = lifetime_valid_usec;
 223
 224         if (verify_dhcp6_address(link, addr) < 0)
 225                 return 0;
 226
 227         r = free_and_strdup_warn(&addr->netlabel, link->network->dhcp6_netlabel);
 228         if (r < 0)
 229                 return r;
 230
 231         if (address_get(link, addr, &existing) < 0)
 232                 link->dhcp6_configured = false;
 233         else
 234                 address_unmark(existing);
 235
 236         r = link_request_address(link, TAKE_PTR(addr), true, &link->dhcp6_messages,
 237                                  dhcp6_address_handler, NULL);
 238         if (r < 0)
 239                 return log_link_error_errno(link, r, "Failed to request DHCPv6 address %s/128: %m",
 240                                             IN6_ADDR_TO_STRING(ip6_addr));
 241         return 0;
 242 }
 243
 244 static int dhcp6_address_acquired(Link *link) {
 245         struct in6_addr server_address;
 246         usec_t timestamp_usec;
 247         int r;
 248
 249         assert(link);
 250         assert(link->network);
 251         assert(link->dhcp6_lease);
 252
 253         if (!link->network->dhcp6_use_address)
 254                 return 0;
 255
 256         r = sd_dhcp6_lease_get_server_address(link->dhcp6_lease, &server_address);
 257         if (r < 0)
 258                 return log_link_warning_errno(link, r, "Failed to get server address of DHCPv6 lease: %m");
 259
 260         r = sd_dhcp6_lease_get_timestamp(link->dhcp6_lease, CLOCK_BOOTTIME, &timestamp_usec);
 261         if (r < 0)
 262                 return log_link_warning_errno(link, r, "Failed to get timestamp of DHCPv6 lease: %m");
 263
 264         for (sd_dhcp6_lease_reset_address_iter(link->dhcp6_lease);;) {
 265                 uint32_t lifetime_preferred_sec, lifetime_valid_sec;
 266                 struct in6_addr ip6_addr;
 267
 268                 r = sd_dhcp6_lease_get_address(link->dhcp6_lease, &ip6_addr, &lifetime_preferred_sec, &lifetime_valid_sec);
 269                 if (r < 0)
 270                         break;
 271
 272                 r = dhcp6_request_address(link, &server_address, &ip6_addr,
 273                                           sec_to_usec(lifetime_preferred_sec, timestamp_usec),
 274                                           sec_to_usec(lifetime_valid_sec, timestamp_usec));
 275                 if (r < 0)
 276                         return r;
 277         }
 278
 279         if (link->network->dhcp6_use_hostname) {
 280                 const char *dhcpname = NULL;
 281                 _cleanup_free_ char *hostname = NULL;
 282
 283                 (void) sd_dhcp6_lease_get_fqdn(link->dhcp6_lease, &dhcpname);
 284
 285                 if (dhcpname) {
 286                         r = shorten_overlong(dhcpname, &hostname);
 287                         if (r < 0)
 288                                 log_link_warning_errno(link, r, "Unable to shorten overlong DHCP hostname '%s', ignoring: %m", dhcpname);
 289                         if (r == 1)
 290                                 log_link_notice(link, "Overlong DHCP hostname received, shortened from '%s' to '%s'", dhcpname, hostname);
 291                 }
 292                 if (hostname) {
 293                         r = manager_set_hostname(link->manager, hostname);
 294                         if (r < 0)
 295                                 log_link_error_errno(link, r, "Failed to set transient hostname to '%s': %m", hostname);
 296                 }
 297         }
 298
 299         return 0;
 300 }
 301
 302 static int dhcp6_lease_ip_acquired(sd_dhcp6_client *client, Link *link) {
 303         _cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease_old = NULL;
 304         sd_dhcp6_lease *lease;
 305         int r;
 306
 307         link_mark_addresses(link, NETWORK_CONFIG_SOURCE_DHCP6, NULL);
 308         link_mark_routes(link, NETWORK_CONFIG_SOURCE_DHCP6, NULL);
 309
 310         r = sd_dhcp6_client_get_lease(client, &lease);
 311         if (r < 0)
 312                 return log_link_error_errno(link, r, "Failed to get DHCPv6 lease: %m");
 313
 314         lease_old = TAKE_PTR(link->dhcp6_lease);
 315         link->dhcp6_lease = sd_dhcp6_lease_ref(lease);
 316
 317         r = dhcp6_address_acquired(link);
 318         if (r < 0)
 319                 return r;
 320
 321         if (dhcp6_lease_has_pd_prefix(lease)) {
 322                 r = dhcp6_pd_prefix_acquired(link);
 323                 if (r < 0)
 324                         return r;
 325         } else if (dhcp6_lease_has_pd_prefix(lease_old))
 326                 /* When we had PD prefixes but not now, we need to remove them. */
 327                 dhcp_pd_prefix_lost(link);
 328
 329         if (link->dhcp6_messages == 0) {
 330                 link->dhcp6_configured = true;
 331
 332                 r = dhcp6_remove(link, /* only_marked = */ true);
 333                 if (r < 0)
 334                         return r;
 335         } else
 336                 log_link_debug(link, "Setting DHCPv6 addresses and routes");
 337
 338         if (!link->dhcp6_configured)
 339                 link_set_state(link, LINK_STATE_CONFIGURING);
 340
 341         link_check_ready(link);
 342         return 0;
 343 }
 344
 345 static int dhcp6_lease_information_acquired(sd_dhcp6_client *client, Link *link) {
 346         return 0;
 347 }
 348
 349 static int dhcp6_lease_lost(Link *link) {
 350         int r;
 351
 352         assert(link);
 353         assert(link->manager);
 354
 355         log_link_info(link, "DHCPv6 lease lost");
 356
 357         if (dhcp6_lease_has_pd_prefix(link->dhcp6_lease))
 358                 dhcp_pd_prefix_lost(link);
 359
 360         link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease);
 361
 362         r = dhcp6_remove(link, /* only_marked = */ false);
 363         if (r < 0)
 364                 return r;
 365
 366         return 0;
 367 }
 368
 369 static void dhcp6_handler(sd_dhcp6_client *client, int event, void *userdata) {
 370         Link *link = ASSERT_PTR(userdata);
 371         int r;
 372
 373         assert(link->network);
 374
 375         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 376                 return;
 377
 378         switch (event) {
 379         case SD_DHCP6_CLIENT_EVENT_STOP:
 380         case SD_DHCP6_CLIENT_EVENT_RESEND_EXPIRE:
 381         case SD_DHCP6_CLIENT_EVENT_RETRANS_MAX:
 382                 r = dhcp6_lease_lost(link);
 383                 if (r < 0)
 384                         link_enter_failed(link);
 385                 break;
 386
 387         case SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE:
 388                 r = dhcp6_lease_ip_acquired(client, link);
 389                 if (r < 0) {
 390                         link_enter_failed(link);
 391                         return;
 392                 }
 393
 394                 _fallthrough_;
 395         case SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST:
 396                 r = dhcp6_lease_information_acquired(client, link);
 397                 if (r < 0)
 398                         link_enter_failed(link);
 399                 break;
 400
 401         default:
 402                 if (event < 0)
 403                         log_link_warning_errno(link, event, "DHCPv6 error: %m");
 404                 else
 405                         log_link_warning(link, "DHCPv6 unknown event: %d", event);
 406                 return;
 407         }
 408 }
 409
 410 int dhcp6_start_on_ra(Link *link, bool information_request) {
 411         int r;
 412
 413         assert(link);
 414         assert(link->dhcp6_client);
 415         assert(link->network);
 416         assert(in6_addr_is_link_local(&link->ipv6ll_address));
 417
 418         if (link_get_dhcp6_client_start_mode(link) != DHCP6_CLIENT_START_MODE_NO)
 419                 /* When WithoutRA= is specified, then the DHCPv6 client should be already running in
 420                  * the requested mode. Hence, ignore the requests by RA. */
 421                 return 0;
 422
 423         r = sd_dhcp6_client_is_running(link->dhcp6_client);
 424         if (r < 0)
 425                 return r;
 426
 427         if (r > 0) {
 428                 int inf_req;
 429
 430                 r = sd_dhcp6_client_get_information_request(link->dhcp6_client, &inf_req);
 431                 if (r < 0)
 432                         return r;
 433
 434                 if (inf_req == information_request)
 435                         /* The client is already running in the requested mode. */
 436                         return 0;
 437
 438                 if (!inf_req) {
 439                         log_link_debug(link,
 440                                        "The DHCPv6 client is already running in the managed mode, "
 441                                        "refusing to start the client in the information requesting mode.");
 442                         return 0;
 443                 }
 444
 445                 log_link_debug(link,
 446                                "The DHCPv6 client is running in the information requesting mode. "
 447                                "Restarting the client in the managed mode.");
 448
 449                 r = sd_dhcp6_client_stop(link->dhcp6_client);
 450                 if (r < 0)
 451                         return r;
 452         } else {
 453                 r = sd_dhcp6_client_set_local_address(link->dhcp6_client, &link->ipv6ll_address);
 454                 if (r < 0)
 455                         return r;
 456         }
 457
 458         r = sd_dhcp6_client_set_information_request(link->dhcp6_client, information_request);
 459         if (r < 0)
 460                 return r;
 461
 462         r = sd_dhcp6_client_start(link->dhcp6_client);
 463         if (r < 0)
 464                 return r;
 465
 466         return 0;
 467 }
 468
 469 int dhcp6_start(Link *link) {
 470         DHCP6ClientStartMode start_mode;
 471         int r;
 472
 473         assert(link);
 474         assert(link->network);
 475
 476         if (!link->dhcp6_client)
 477                 return 0;
 478
 479         if (!link_dhcp6_enabled(link))
 480                 return 0;
 481
 482         if (!link_has_carrier(link))
 483                 return 0;
 484
 485         if (sd_dhcp6_client_is_running(link->dhcp6_client) > 0)
 486                 return 0;
 487
 488         if (!in6_addr_is_link_local(&link->ipv6ll_address)) {
 489                 log_link_debug(link, "IPv6 link-local address is not set, delaying to start DHCPv6 client.");
 490                 return 0;
 491         }
 492
 493         r = sd_dhcp6_client_set_local_address(link->dhcp6_client, &link->ipv6ll_address);
 494         if (r < 0)
 495                 return r;
 496
 497         start_mode = link_get_dhcp6_client_start_mode(link);
 498         if (start_mode == DHCP6_CLIENT_START_MODE_NO)
 499                 return 0;
 500
 501         r = sd_dhcp6_client_set_information_request(link->dhcp6_client,
 502                                                     start_mode == DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST);
 503         if (r < 0)
 504                 return r;
 505
 506         r = sd_dhcp6_client_start(link->dhcp6_client);
 507         if (r < 0)
 508                 return r;
 509
 510         return 1;
 511 }
 512
 513 static int dhcp6_set_hostname(sd_dhcp6_client *client, Link *link) {
 514         _cleanup_free_ char *hostname = NULL;
 515         const char *hn;
 516         int r;
 517
 518         assert(link);
 519
 520         if (!link->network->dhcp_send_hostname)
 521                 hn = NULL;
 522         else if (link->network->dhcp_hostname)
 523                 hn = link->network->dhcp_hostname;
 524         else {
 525                 r = gethostname_strict(&hostname);
 526                 if (r < 0 && r != -ENXIO) /* ENXIO: no hostname set or hostname is "localhost" */
 527                         return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to get hostname: %m");
 528
 529                 hn = hostname;
 530         }
 531
 532         r = sd_dhcp6_client_set_fqdn(client, hn);
 533         if (r == -EINVAL && hostname)
 534                 /* Ignore error when the machine's hostname is not suitable to send in DHCP packet. */
 535                 log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set hostname from kernel hostname, ignoring: %m");
 536         else if (r < 0)
 537                 return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set hostname: %m");
 538
 539         return 0;
 540 }
 541
 542 static int dhcp6_set_identifier(Link *link, sd_dhcp6_client *client) {
 543         const DUID *duid;
 544         int r;
 545
 546         assert(link);
 547         assert(link->network);
 548         assert(client);
 549
 550         r = sd_dhcp6_client_set_mac(client, link->hw_addr.bytes, link->hw_addr.length, link->iftype);
 551         if (r < 0)
 552                 return r;
 553
 554         if (link->network->dhcp6_iaid_set) {
 555                 r = sd_dhcp6_client_set_iaid(client, link->network->dhcp6_iaid);
 556                 if (r < 0)
 557                         return r;
 558         }
 559
 560         duid = link_get_dhcp6_duid(link);
 561         if (duid->type == DUID_TYPE_LLT && duid->raw_data_len == 0)
 562                 r = sd_dhcp6_client_set_duid_llt(client, duid->llt_time);
 563         else
 564                 r = sd_dhcp6_client_set_duid(client,
 565                                              duid->type,
 566                                              duid->raw_data_len > 0 ? duid->raw_data : NULL,
 567                                              duid->raw_data_len);
 568         if (r < 0)
 569                 return r;
 570
 571         return 0;
 572 }
 573
 574 static int dhcp6_configure(Link *link) {
 575         _cleanup_(sd_dhcp6_client_unrefp) sd_dhcp6_client *client = NULL;
 576         sd_dhcp6_option *vendor_option;
 577         sd_dhcp6_option *send_option;
 578         void *request_options;
 579         int r;
 580
 581         assert(link);
 582         assert(link->network);
 583
 584         if (link->dhcp6_client)
 585                 return log_link_debug_errno(link, SYNTHETIC_ERRNO(EBUSY), "DHCPv6 client is already configured.");
 586
 587         r = sd_dhcp6_client_new(&client);
 588         if (r == -ENOMEM)
 589                 return log_oom_debug();
 590         if (r < 0)
 591                 return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to create DHCPv6 client: %m");
 592
 593         r = sd_dhcp6_client_attach_event(client, link->manager->event, 0);
 594         if (r < 0)
 595                 return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to attach event: %m");
 596
 597         r = dhcp6_set_identifier(link, client);
 598         if (r < 0)
 599                 return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set identifier: %m");
 600
 601         ORDERED_HASHMAP_FOREACH(send_option, link->network->dhcp6_client_send_options) {
 602                 r = sd_dhcp6_client_add_option(client, send_option);
 603                 if (r == -EEXIST)
 604                         continue;
 605                 if (r < 0)
 606                         return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set option: %m");
 607         }
 608
 609         r = dhcp6_set_hostname(client, link);
 610         if (r < 0)
 611                 return r;
 612
 613         r = sd_dhcp6_client_set_ifindex(client, link->ifindex);
 614         if (r < 0)
 615                 return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set ifindex: %m");
 616
 617         if (link->network->dhcp6_mudurl) {
 618                 r = sd_dhcp6_client_set_request_mud_url(client, link->network->dhcp6_mudurl);
 619                 if (r < 0)
 620                         return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set MUD URL: %m");
 621         }
 622
 623         if (link->network->dhcp6_use_dns) {
 624                 r = sd_dhcp6_client_set_request_option(client, SD_DHCP6_OPTION_DNS_SERVER);
 625                 if (r < 0)
 626                         return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to request DNS servers: %m");
 627         }
 628
 629         if (link->network->dhcp6_use_domains > 0) {
 630                 r = sd_dhcp6_client_set_request_option(client, SD_DHCP6_OPTION_DOMAIN);
 631                 if (r < 0)
 632                         return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to request domains: %m");
 633         }
 634
 635         if (link->network->dhcp6_use_ntp) {
 636                 r = sd_dhcp6_client_set_request_option(client, SD_DHCP6_OPTION_NTP_SERVER);
 637                 if (r < 0)
 638                         return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to request NTP servers: %m");
 639
 640                 /* If the server does not provide NTP servers, then we fallback to use SNTP servers. */
 641                 r = sd_dhcp6_client_set_request_option(client, SD_DHCP6_OPTION_SNTP_SERVER);
 642                 if (r < 0)
 643                         return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to request SNTP servers: %m");
 644         }
 645
 646         SET_FOREACH(request_options, link->network->dhcp6_request_options) {
 647                 uint32_t option = PTR_TO_UINT32(request_options);
 648
 649                 r = sd_dhcp6_client_set_request_option(client, option);
 650                 if (r == -EEXIST) {
 651                         log_link_debug(link, "DHCPv6 CLIENT: Failed to set request flag for '%u' already exists, ignoring.", option);
 652                         continue;
 653                 }
 654                 if (r < 0)
 655                         return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set request flag for '%u': %m", option);
 656         }
 657
 658         if (link->network->dhcp6_user_class) {
 659                 r = sd_dhcp6_client_set_request_user_class(client, link->network->dhcp6_user_class);
 660                 if (r < 0)
 661                         return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set user class: %m");
 662         }
 663
 664         if (link->network->dhcp6_vendor_class) {
 665                 r = sd_dhcp6_client_set_request_vendor_class(client, link->network->dhcp6_vendor_class);
 666                 if (r < 0)
 667                         return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set vendor class: %m");
 668         }
 669
 670         ORDERED_HASHMAP_FOREACH(vendor_option, link->network->dhcp6_client_send_vendor_options) {
 671                 r = sd_dhcp6_client_add_vendor_option(client, vendor_option);
 672                 if (r == -EEXIST)
 673                         continue;
 674                 if (r < 0)
 675                         return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set vendor option: %m");
 676         }
 677
 678         r = sd_dhcp6_client_set_callback(client, dhcp6_handler, link);
 679         if (r < 0)
 680                 return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set callback: %m");
 681
 682         r = sd_dhcp6_client_set_prefix_delegation(client, link->network->dhcp6_use_pd_prefix);
 683         if (r < 0)
 684                 return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to %s requesting prefixes to be delegated: %m",
 685                                             enable_disable(link->network->dhcp6_use_pd_prefix));
 686
 687         /* Even if UseAddress=no, we need to request IA_NA, as the dhcp6 client may be started in solicit mode. */
 688         r = sd_dhcp6_client_set_address_request(client, link->network->dhcp6_use_pd_prefix ? link->network->dhcp6_use_address : true);
 689         if (r < 0)
 690                 return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to %s requesting address: %m",
 691                                             enable_disable(link->network->dhcp6_use_address));
 692
 693         if (link->network->dhcp6_pd_prefix_length > 0) {
 694                 r = sd_dhcp6_client_set_prefix_delegation_hint(client,
 695                                                                link->network->dhcp6_pd_prefix_length,
 696                                                                &link->network->dhcp6_pd_prefix_hint);
 697                 if (r < 0)
 698                         return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set prefix delegation hint: %m");
 699         }
 700
 701         r = sd_dhcp6_client_set_rapid_commit(client, link->network->dhcp6_use_rapid_commit);
 702         if (r < 0)
 703                 return log_link_debug_errno(link, r,
 704                                             "DHCPv6 CLIENT: Failed to %s rapid commit: %m",
 705                                             enable_disable(link->network->dhcp6_use_rapid_commit));
 706
 707         link->dhcp6_client = TAKE_PTR(client);
 708
 709         return 0;
 710 }
 711
 712 int dhcp6_update_mac(Link *link) {
 713         bool restart;
 714         int r;
 715
 716         assert(link);
 717
 718         if (!link->dhcp6_client)
 719                 return 0;
 720
 721         restart = sd_dhcp6_client_is_running(link->dhcp6_client) > 0;
 722
 723         if (restart) {
 724                 r = sd_dhcp6_client_stop(link->dhcp6_client);
 725                 if (r < 0)
 726                         return r;
 727         }
 728
 729         r = dhcp6_set_identifier(link, link->dhcp6_client);
 730         if (r < 0)
 731                 return r;
 732
 733         if (restart) {
 734                 r = sd_dhcp6_client_start(link->dhcp6_client);
 735                 if (r < 0)
 736                         return log_link_warning_errno(link, r, "Could not restart DHCPv6 client: %m");
 737         }
 738
 739         return 0;
 740 }
 741
 742 static int dhcp6_process_request(Request *req, Link *link, void *userdata) {
 743         int r;
 744
 745         assert(link);
 746
 747         if (!link_is_ready_to_configure(link, /* allow_unmanaged = */ false))
 748                 return 0;
 749
 750         r = dhcp_configure_duid(link, link_get_dhcp6_duid(link));
 751         if (r <= 0)
 752                 return r;
 753
 754         r = dhcp6_configure(link);
 755         if (r < 0)
 756                 return log_link_warning_errno(link, r, "Failed to configure DHCPv6 client: %m");
 757
 758         r = ndisc_start(link);
 759         if (r < 0)
 760                 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m");
 761
 762         r = dhcp6_start(link);
 763         if (r < 0)
 764                 return log_link_warning_errno(link, r, "Failed to start DHCPv6 client: %m");
 765
 766         log_link_debug(link, "DHCPv6 client is configured%s.",
 767                        r > 0 ? ", acquiring DHCPv6 lease" : "");
 768         return 1;
 769 }
 770
 771 int link_request_dhcp6_client(Link *link) {
 772         int r;
 773
 774         assert(link);
 775
 776         if (!link_dhcp6_enabled(link) && !link_ipv6_accept_ra_enabled(link))
 777                 return 0;
 778
 779         if (link->dhcp6_client)
 780                 return 0;
 781
 782         r = link_queue_request(link, REQUEST_TYPE_DHCP6_CLIENT, dhcp6_process_request, NULL);
 783         if (r < 0)
 784                 return log_link_warning_errno(link, r, "Failed to request configuring of the DHCPv6 client: %m");
 785
 786         log_link_debug(link, "Requested configuring of the DHCPv6 client.");
 787         return 0;
 788 }
 789
 790 int link_serialize_dhcp6_client(Link *link, FILE *f) {
 791         _cleanup_free_ char *duid = NULL;
 792         uint32_t iaid;
 793         int r;
 794
 795         assert(link);
 796
 797         if (!link->dhcp6_client)
 798                 return 0;
 799
 800         r = sd_dhcp6_client_get_iaid(link->dhcp6_client, &iaid);
 801         if (r >= 0)
 802                 fprintf(f, "DHCP6_CLIENT_IAID=0x%x\n", iaid);
 803
 804         r = sd_dhcp6_client_duid_as_string(link->dhcp6_client, &duid);
 805         if (r >= 0)
 806                 fprintf(f, "DHCP6_CLIENT_DUID=%s\n", duid);
 807
 808         return 0;
 809 }
 810
 811 int config_parse_dhcp6_pd_prefix_hint(
 812                 const char* unit,
 813                 const char *filename,
 814                 unsigned line,
 815                 const char *section,
 816                 unsigned section_line,
 817                 const char *lvalue,
 818                 int ltype,
 819                 const char *rvalue,
 820                 void *data,
 821                 void *userdata) {
 822
 823         Network *network = ASSERT_PTR(userdata);
 824         union in_addr_union u;
 825         unsigned char prefixlen;
 826         int r;
 827
 828         assert(filename);
 829         assert(lvalue);
 830         assert(rvalue);
 831
 832         r = in_addr_prefix_from_string(rvalue, AF_INET6, &u, &prefixlen);
 833         if (r < 0) {
 834                 log_syntax(unit, LOG_WARNING, filename, line, r,
 835                            "Failed to parse %s=%s, ignoring assignment.", lvalue, rvalue);
 836                 return 0;
 837         }
 838
 839         if (prefixlen < 1 || prefixlen > 128) {
 840                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 841                            "Invalid prefix length in %s=%s, ignoring assignment.", lvalue, rvalue);
 842                 return 0;
 843         }
 844
 845         network->dhcp6_pd_prefix_hint = u.in6;
 846         network->dhcp6_pd_prefix_length = prefixlen;
 847
 848         return 0;
 849 }
 850
 851 DEFINE_CONFIG_PARSE_ENUM(config_parse_dhcp6_client_start_mode, dhcp6_client_start_mode, DHCP6ClientStartMode,
 852                          "Failed to parse WithoutRA= setting");
 853
 854 static const char* const dhcp6_client_start_mode_table[_DHCP6_CLIENT_START_MODE_MAX] = {
 855         [DHCP6_CLIENT_START_MODE_NO]                  = "no",
 856         [DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST] = "information-request",
 857         [DHCP6_CLIENT_START_MODE_SOLICIT]             = "solicit",
 858 };
 859
 860 DEFINE_STRING_TABLE_LOOKUP(dhcp6_client_start_mode, DHCP6ClientStartMode);