src/network/networkd-link.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2013 Tom Gundersen <teg@jklm.no>
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <netinet/ether.h>
  23 #include <linux/if.h>
  24
  25 #include "networkd.h"
  26 #include "libudev-private.h"
  27 #include "udev-util.h"
  28 #include "util.h"
  29 #include "virt.h"
  30 #include "bus-util.h"
  31 #include "network-internal.h"
  32
  33 #include "dhcp-lease-internal.h"
  34
  35 static int ipv4ll_address_update(Link *link, bool deprecate);
  36 static bool ipv4ll_is_bound(sd_ipv4ll *ll);
  37
  38 static int link_new(Manager *manager, sd_rtnl_message *message, Link **ret) {
  39         _cleanup_link_free_ Link *link = NULL;
  40         uint16_t type;
  41         char *ifname;
  42         int r, ifindex;
  43
  44         assert(manager);
  45         assert(manager->links);
  46         assert(message);
  47         assert(ret);
  48
  49         r = sd_rtnl_message_get_type(message, &type);
  50         if (r < 0)
  51                 return r;
  52         else if (type != RTM_NEWLINK)
  53                 return -EINVAL;
  54
  55         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
  56         if (r < 0)
  57                 return r;
  58         else if (ifindex <= 0)
  59                 return -EINVAL;
  60
  61         r = sd_rtnl_message_read_string(message, IFLA_IFNAME, &ifname);
  62         if (r < 0)
  63                 return r;
  64
  65         link = new0(Link, 1);
  66         if (!link)
  67                 return -ENOMEM;
  68
  69         link->manager = manager;
  70         link->state = LINK_STATE_INITIALIZING;
  71         link->ifindex = ifindex;
  72         link->ifname = strdup(ifname);
  73         if (!link->ifname)
  74                 return -ENOMEM;
  75
  76         r = asprintf(&link->state_file, "/run/systemd/network/links/%"PRIu64,
  77                      link->ifindex);
  78         if (r < 0)
  79                 return -ENOMEM;
  80
  81         r = hashmap_put(manager->links, &link->ifindex, link);
  82         if (r < 0)
  83                 return r;
  84
  85         *ret = link;
  86         link = NULL;
  87
  88         return 0;
  89 }
  90
  91 void link_free(Link *link) {
  92         if (!link)
  93                 return;
  94
  95         assert(link->manager);
  96
  97         sd_dhcp_client_unref(link->dhcp_client);
  98         sd_dhcp_lease_unref(link->dhcp_lease);
  99
 100         sd_ipv4ll_unref(link->ipv4ll);
 101
 102         hashmap_remove(link->manager->links, &link->ifindex);
 103
 104         free(link->ifname);
 105         free(link->state_file);
 106
 107         udev_device_unref(link->udev_device);
 108
 109         free(link);
 110 }
 111
 112 int link_get(Manager *m, int ifindex, Link **ret) {
 113         Link *link;
 114         uint64_t ifindex_64;
 115
 116         assert(m);
 117         assert(m->links);
 118         assert(ifindex);
 119         assert(ret);
 120
 121         ifindex_64 = ifindex;
 122         link = hashmap_get(m->links, &ifindex_64);
 123         if (!link)
 124                 return -ENODEV;
 125
 126         *ret = link;
 127
 128         return 0;
 129 }
 130
 131 static int link_enter_configured(Link *link) {
 132         assert(link);
 133         assert(link->state == LINK_STATE_SETTING_ROUTES);
 134
 135         log_info_link(link, "link configured");
 136
 137         link->state = LINK_STATE_CONFIGURED;
 138
 139         link_save(link);
 140
 141         return 0;
 142 }
 143
 144 static void link_enter_unmanaged(Link *link) {
 145         assert(link);
 146
 147         log_info_link(link, "unmanaged");
 148
 149         link->state = LINK_STATE_UNMANAGED;
 150
 151         link_save(link);
 152 }
 153
 154 static void link_enter_failed(Link *link) {
 155         assert(link);
 156
 157         log_warning_link(link, "failed");
 158
 159         link->state = LINK_STATE_FAILED;
 160
 161         link_save(link);
 162 }
 163
 164 static int route_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
 165         Link *link = userdata;
 166         int r;
 167
 168         assert(link->route_messages > 0);
 169         assert(link->state == LINK_STATE_SETTING_ADDRESSES ||
 170                link->state == LINK_STATE_SETTING_ROUTES ||
 171                link->state == LINK_STATE_FAILED);
 172
 173         link->route_messages --;
 174
 175         if (link->state == LINK_STATE_FAILED)
 176                 return 1;
 177
 178         r = sd_rtnl_message_get_errno(m);
 179         if (r < 0 && r != -EEXIST)
 180                 log_struct_link(LOG_WARNING, link,
 181                                 "MESSAGE=%s: could not set route: %s",
 182                                 link->ifname, strerror(-r),
 183                                 "ERRNO=%d", -r,
 184                                 NULL);
 185
 186         /* we might have received an old reply after moving back to SETTING_ADDRESSES,
 187          * ignore it */
 188         if (link->route_messages == 0 && link->state == LINK_STATE_SETTING_ROUTES) {
 189                 log_debug_link(link, "routes set");
 190                 link_enter_configured(link);
 191         }
 192
 193         return 1;
 194 }
 195
 196 static int link_enter_set_routes(Link *link) {
 197         Route *rt;
 198         int r;
 199
 200         assert(link);
 201         assert(link->network);
 202         assert(link->state == LINK_STATE_SETTING_ADDRESSES);
 203
 204         link->state = LINK_STATE_SETTING_ROUTES;
 205
 206         if (!link->network->static_routes && !link->dhcp_lease &&
 207                 (!link->ipv4ll || ipv4ll_is_bound(link->ipv4ll) == false))
 208                 return link_enter_configured(link);
 209
 210         log_debug_link(link, "setting routes");
 211
 212         LIST_FOREACH(static_routes, rt, link->network->static_routes) {
 213                 r = route_configure(rt, link, &route_handler);
 214                 if (r < 0) {
 215                         log_warning_link(link,
 216                                          "could not set routes: %s", strerror(-r));
 217                         link_enter_failed(link);
 218                         return r;
 219                 }
 220
 221                 link->route_messages ++;
 222         }
 223
 224         if (link->ipv4ll && !link->dhcp_lease) {
 225                 _cleanup_route_free_ Route *route = NULL;
 226                 struct in_addr addr;
 227
 228                 r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
 229                 if (r < 0 && r != -ENOENT) {
 230                         log_warning_link(link, "IPV4LL error: no address: %s",
 231                                         strerror(-r));
 232                         return r;
 233                 }
 234
 235                 if (r != -ENOENT) {
 236                         r = route_new_dynamic(&route);
 237                         if (r < 0) {
 238                                 log_error_link(link, "Could not allocate route: %s",
 239                                                strerror(-r));
 240                                 return r;
 241                         }
 242
 243                         route->family = AF_INET;
 244                         route->scope = RT_SCOPE_LINK;
 245                         route->metrics = 99;
 246
 247                         r = route_configure(route, link, &route_handler);
 248                         if (r < 0) {
 249                                 log_warning_link(link,
 250                                                  "could not set routes: %s", strerror(-r));
 251                                 link_enter_failed(link);
 252                                 return r;
 253                         }
 254
 255                         link->route_messages ++;
 256                 }
 257         }
 258
 259         if (link->dhcp_lease) {
 260                 _cleanup_route_free_ Route *route = NULL;
 261                 _cleanup_route_free_ Route *route_gw = NULL;
 262                 struct in_addr gateway;
 263
 264                 r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
 265                 if (r < 0) {
 266                         log_warning_link(link, "DHCP error: no router: %s",
 267                                          strerror(-r));
 268                         return r;
 269                 }
 270
 271                 r = route_new_dynamic(&route);
 272                 if (r < 0) {
 273                         log_error_link(link, "Could not allocate route: %s",
 274                                        strerror(-r));
 275                         return r;
 276                 }
 277
 278                 r = route_new_dynamic(&route_gw);
 279                 if (r < 0) {
 280                         log_error_link(link, "Could not allocate route: %s",
 281                                        strerror(-r));
 282                         return r;
 283                 }
 284
 285                 /* The dhcp netmask may mask out the gateway. Add an explicit
 286                  * route for the gw host so that we can route no matter the
 287                  * netmask or existing kernel route tables. */
 288                 route_gw->family = AF_INET;
 289                 route_gw->dst_addr.in = gateway;
 290                 route_gw->dst_prefixlen = 32;
 291                 route_gw->scope = RT_SCOPE_LINK;
 292
 293                 r = route_configure(route_gw, link, &route_handler);
 294                 if (r < 0) {
 295                         log_warning_link(link,
 296                                          "could not set host route: %s", strerror(-r));
 297                         return r;
 298                 }
 299
 300                 link->route_messages ++;
 301
 302                 route->family = AF_INET;
 303                 route->in_addr.in = gateway;
 304
 305                 r = route_configure(route, link, &route_handler);
 306                 if (r < 0) {
 307                         log_warning_link(link,
 308                                          "could not set routes: %s", strerror(-r));
 309                         link_enter_failed(link);
 310                         return r;
 311                 }
 312
 313                 link->route_messages ++;
 314         }
 315
 316         return 0;
 317 }
 318
 319 static int route_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
 320         Link *link = userdata;
 321         int r;
 322
 323         assert(m);
 324         assert(link);
 325         assert(link->ifname);
 326
 327         if (link->state == LINK_STATE_FAILED)
 328                 return 1;
 329
 330         r = sd_rtnl_message_get_errno(m);
 331         if (r < 0 && r != -ENOENT)
 332                 log_struct_link(LOG_WARNING, link,
 333                                 "MESSAGE=%s: could not drop route: %s",
 334                                 link->ifname, strerror(-r),
 335                                 "ERRNO=%d", -r,
 336                                 NULL);
 337
 338         return 0;
 339 }
 340
 341 static int address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
 342         Link *link = userdata;
 343         int r;
 344
 345         assert(m);
 346         assert(link);
 347         assert(link->ifname);
 348         assert(link->addr_messages > 0);
 349         assert(link->state == LINK_STATE_SETTING_ADDRESSES || link->state == LINK_STATE_FAILED);
 350
 351         link->addr_messages --;
 352
 353         if (link->state == LINK_STATE_FAILED)
 354                 return 1;
 355
 356         r = sd_rtnl_message_get_errno(m);
 357         if (r < 0 && r != -EEXIST)
 358                 log_struct_link(LOG_WARNING, link,
 359                                 "MESSAGE=%s: could not set address: %s",
 360                                 link->ifname, strerror(-r),
 361                                 "ERRNO=%d", -r,
 362                                 NULL);
 363
 364         if (link->addr_messages == 0) {
 365                 log_debug_link(link, "addresses set");
 366                 link_enter_set_routes(link);
 367         }
 368
 369         return 1;
 370 }
 371
 372 static int link_enter_set_addresses(Link *link) {
 373         Address *ad;
 374         int r;
 375
 376         assert(link);
 377         assert(link->network);
 378         assert(link->state != _LINK_STATE_INVALID);
 379
 380         link->state = LINK_STATE_SETTING_ADDRESSES;
 381
 382         if (!link->network->static_addresses && !link->dhcp_lease &&
 383                 (!link->ipv4ll || ipv4ll_is_bound(link->ipv4ll) == false))
 384                 return link_enter_set_routes(link);
 385
 386         log_debug_link(link, "setting addresses");
 387
 388         LIST_FOREACH(static_addresses, ad, link->network->static_addresses) {
 389                 r = address_configure(ad, link, &address_handler);
 390                 if (r < 0) {
 391                         log_warning_link(link,
 392                                          "could not set addresses: %s", strerror(-r));
 393                         link_enter_failed(link);
 394                         return r;
 395                 }
 396
 397                 link->addr_messages ++;
 398         }
 399
 400         if (link->ipv4ll && !link->dhcp_lease) {
 401                 _cleanup_address_free_ Address *ll_addr = NULL;
 402                 struct in_addr addr;
 403
 404                 r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
 405                 if (r < 0 && r != -ENOENT) {
 406                         log_warning_link(link, "IPV4LL error: no address: %s",
 407                                         strerror(-r));
 408                         return r;
 409                 }
 410
 411                 if (r != -ENOENT) {
 412                         r = address_new_dynamic(&ll_addr);
 413                         if (r < 0) {
 414                                 log_error_link(link, "Could not allocate address: %s", strerror(-r));
 415                                 return r;
 416                         }
 417
 418                         ll_addr->family = AF_INET;
 419                         ll_addr->in_addr.in = addr;
 420                         ll_addr->prefixlen = 16;
 421                         ll_addr->broadcast.s_addr = ll_addr->in_addr.in.s_addr | htonl(0xfffffffflu >> ll_addr->prefixlen);
 422                         ll_addr->scope = RT_SCOPE_LINK;
 423
 424                         r = address_configure(ll_addr, link, &address_handler);
 425                         if (r < 0) {
 426                                 log_warning_link(link,
 427                                          "could not set addresses: %s", strerror(-r));
 428                                 link_enter_failed(link);
 429                                 return r;
 430                         }
 431
 432                         link->addr_messages ++;
 433                 }
 434         }
 435
 436         if (link->dhcp_lease) {
 437                 _cleanup_address_free_ Address *address = NULL;
 438                 struct in_addr addr;
 439                 struct in_addr netmask;
 440                 unsigned prefixlen;
 441
 442                 r = sd_dhcp_lease_get_address(link->dhcp_lease, &addr);
 443                 if (r < 0) {
 444                         log_warning_link(link, "DHCP error: no address: %s",
 445                                          strerror(-r));
 446                         return r;
 447                 }
 448
 449                 r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
 450                 if (r < 0) {
 451                         log_warning_link(link, "DHCP error: no netmask: %s",
 452                                          strerror(-r));
 453                         return r;
 454                 }
 455
 456                 prefixlen = net_netmask_to_prefixlen(&netmask);
 457
 458                 r = address_new_dynamic(&address);
 459                 if (r < 0) {
 460                         log_error_link(link, "Could not allocate address: %s",
 461                                        strerror(-r));
 462                         return r;
 463                 }
 464
 465                 address->family = AF_INET;
 466                 address->in_addr.in = addr;
 467                 address->prefixlen = prefixlen;
 468                 address->broadcast.s_addr = addr.s_addr | ~netmask.s_addr;
 469
 470                 r = address_configure(address, link, &address_handler);
 471                 if (r < 0) {
 472                         log_warning_link(link,
 473                                          "could not set addresses: %s", strerror(-r));
 474                         link_enter_failed(link);
 475                         return r;
 476                 }
 477
 478                 link->addr_messages ++;
 479         }
 480
 481         return 0;
 482 }
 483
 484 static int address_update_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
 485         Link *link = userdata;
 486         int r;
 487
 488         assert(m);
 489         assert(link);
 490         assert(link->ifname);
 491
 492         if (link->state == LINK_STATE_FAILED)
 493                 return 1;
 494
 495         r = sd_rtnl_message_get_errno(m);
 496         if (r < 0 && r != -ENOENT)
 497                 log_struct_link(LOG_WARNING, link,
 498                                 "MESSAGE=%s: could not update address: %s",
 499                                 link->ifname, strerror(-r),
 500                                 "ERRNO=%d", -r,
 501                                 NULL);
 502
 503         return 0;
 504 }
 505
 506 static int address_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
 507         Link *link = userdata;
 508         int r;
 509
 510         assert(m);
 511         assert(link);
 512         assert(link->ifname);
 513
 514         if (link->state == LINK_STATE_FAILED)
 515                 return 1;
 516
 517         r = sd_rtnl_message_get_errno(m);
 518         if (r < 0 && r != -ENOENT)
 519                 log_struct_link(LOG_WARNING, link,
 520                                 "MESSAGE=%s: could not drop address: %s",
 521                                 link->ifname, strerror(-r),
 522                                 "ERRNO=%d", -r,
 523                                 NULL);
 524
 525         return 0;
 526 }
 527
 528 static int set_hostname_handler(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
 529         int r;
 530
 531         r = sd_bus_message_get_errno(m);
 532         if (r < 0)
 533                 log_warning("Could not set hostname: %s", strerror(-r));
 534
 535         return 1;
 536 }
 537
 538 static int set_hostname(sd_bus *bus, const char *hostname) {
 539         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
 540         int r = 0;
 541
 542         assert(hostname);
 543
 544         log_debug("Setting transient hostname: '%s'", hostname);
 545
 546         if (!bus) { /* TODO: replace by assert when we can rely on kdbus */
 547                 log_info("Not connected to system bus, ignoring transient hostname.");
 548                 return 0;
 549         }
 550
 551         r = sd_bus_message_new_method_call(
 552                         bus,
 553                         &m,
 554                         "org.freedesktop.hostname1",
 555                         "/org/freedesktop/hostname1",
 556                         "org.freedesktop.hostname1",
 557                         "SetHostname");
 558         if (r < 0)
 559                 return r;
 560
 561         r = sd_bus_message_append(m, "sb", hostname, false);
 562         if (r < 0)
 563                 return r;
 564
 565         r = sd_bus_call_async(bus, m, set_hostname_handler, NULL, 0, NULL);
 566         if (r < 0)
 567                 log_error("Could not set transient hostname: %s", strerror(-r));
 568
 569         return r;
 570 }
 571
 572 static int set_mtu_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
 573         Link *link = userdata;
 574         int r;
 575
 576         assert(m);
 577         assert(link);
 578         assert(link->ifname);
 579
 580         if (link->state == LINK_STATE_FAILED)
 581                 return 1;
 582
 583         r = sd_rtnl_message_get_errno(m);
 584         if (r < 0)
 585                 log_struct_link(LOG_WARNING, link,
 586                                 "MESSAGE=%s: could not set MTU: %s",
 587                                 link->ifname, strerror(-r),
 588                                 "ERRNO=%d", -r,
 589                                 NULL);
 590
 591         return 1;
 592 }
 593
 594 static int link_set_mtu(Link *link, uint32_t mtu) {
 595         _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
 596         int r;
 597
 598         assert(link);
 599         assert(link->manager);
 600         assert(link->manager->rtnl);
 601
 602         log_debug_link(link, "setting MTU: %" PRIu32, mtu);
 603
 604         r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
 605                                      RTM_SETLINK, link->ifindex);
 606         if (r < 0) {
 607                 log_error_link(link, "Could not allocate RTM_SETLINK message");
 608                 return r;
 609         }
 610
 611         r = sd_rtnl_message_append_u32(req, IFLA_MTU, mtu);
 612         if (r < 0) {
 613                 log_error_link(link, "Could not append MTU: %s", strerror(-r));
 614                 return r;
 615         }
 616
 617         r = sd_rtnl_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL);
 618         if (r < 0) {
 619                 log_error_link(link,
 620                                "Could not send rtnetlink message: %s", strerror(-r));
 621                 return r;
 622         }
 623
 624         return 0;
 625 }
 626
 627 static int dhcp_lease_lost(Link *link) {
 628         _cleanup_address_free_ Address *address = NULL;
 629         _cleanup_route_free_ Route *route_gw = NULL;
 630         _cleanup_route_free_ Route *route = NULL;
 631         struct in_addr addr;
 632         struct in_addr netmask;
 633         struct in_addr gateway;
 634         unsigned prefixlen;
 635         int r;
 636
 637         assert(link);
 638         assert(link->dhcp_lease);
 639
 640         log_warning_link(link, "DHCP lease lost");
 641
 642         r = address_new_dynamic(&address);
 643         if (r >= 0) {
 644                 sd_dhcp_lease_get_address(link->dhcp_lease, &addr);
 645                 sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
 646                 sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
 647                 prefixlen = net_netmask_to_prefixlen(&netmask);
 648
 649                 r = route_new_dynamic(&route_gw);
 650                 if (r >= 0) {
 651                         route_gw->family = AF_INET;
 652                         route_gw->dst_addr.in = gateway;
 653                         route_gw->dst_prefixlen = 32;
 654                         route_gw->scope = RT_SCOPE_LINK;
 655
 656                         route_drop(route_gw, link, &route_drop_handler);
 657                 }
 658
 659                 r = route_new_dynamic(&route);
 660                 if (r >= 0) {
 661                         route->family = AF_INET;
 662                         route->in_addr.in = gateway;
 663
 664                         route_drop(route, link, &route_drop_handler);
 665                 }
 666
 667                 address->family = AF_INET;
 668                 address->in_addr.in = addr;
 669                 address->prefixlen = prefixlen;
 670
 671                 address_drop(address, link, &address_drop_handler);
 672         }
 673
 674         if (link->network->dhcp_mtu) {
 675                 uint16_t mtu;
 676
 677                 r = sd_dhcp_lease_get_mtu(link->dhcp_lease, &mtu);
 678                 if (r >= 0 && link->original_mtu != mtu) {
 679                         r = link_set_mtu(link, link->original_mtu);
 680                         if (r < 0) {
 681                                 log_warning_link(link, "DHCP error: could not reset MTU");
 682                                 link_enter_failed(link);
 683                                 return r;
 684                         }
 685                 }
 686         }
 687
 688         if (link->network->dhcp_hostname) {
 689                 const char *hostname = NULL;
 690
 691                 r = sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname);
 692                 if (r >= 0 && hostname) {
 693                         r = set_hostname(link->manager->bus, "");
 694                         if (r < 0)
 695                                 log_error("Failed to reset transient hostname");
 696                 }
 697         }
 698
 699         link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
 700
 701         return 0;
 702 }
 703
 704 static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) {
 705         sd_dhcp_lease *lease;
 706         struct in_addr address;
 707         struct in_addr netmask;
 708         struct in_addr gateway;
 709         unsigned prefixlen;
 710         struct in_addr *nameservers;
 711         size_t nameservers_size;
 712         int r;
 713
 714         assert(client);
 715         assert(link);
 716
 717         r = sd_dhcp_client_get_lease(client, &lease);
 718         if (r < 0) {
 719                 log_warning_link(link, "DHCP error: no lease: %s",
 720                                  strerror(-r));
 721                 return r;
 722         }
 723
 724         r = sd_dhcp_lease_get_address(lease, &address);
 725         if (r < 0) {
 726                 log_warning_link(link, "DHCP error: no address: %s",
 727                                  strerror(-r));
 728                 return r;
 729         }
 730
 731         r = sd_dhcp_lease_get_netmask(lease, &netmask);
 732         if (r < 0) {
 733                 log_warning_link(link, "DHCP error: no netmask: %s",
 734                                  strerror(-r));
 735                 return r;
 736         }
 737
 738         prefixlen = net_netmask_to_prefixlen(&netmask);
 739
 740         r = sd_dhcp_lease_get_router(lease, &gateway);
 741         if (r < 0) {
 742                 log_warning_link(link, "DHCP error: no router: %s",
 743                                  strerror(-r));
 744                 return r;
 745         }
 746
 747         log_struct_link(LOG_INFO, link,
 748                         "MESSAGE=%s: DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u",
 749                          link->ifname,
 750                          ADDRESS_FMT_VAL(address),
 751                          prefixlen,
 752                          ADDRESS_FMT_VAL(gateway),
 753                          "ADDRESS=%u.%u.%u.%u",
 754                          ADDRESS_FMT_VAL(address),
 755                          "PREFIXLEN=%u",
 756                          prefixlen,
 757                          "GATEWAY=%u.%u.%u.%u",
 758                          ADDRESS_FMT_VAL(gateway),
 759                          NULL);
 760
 761         link->dhcp_lease = lease;
 762
 763         if (link->network->dhcp_dns) {
 764                 r = sd_dhcp_lease_get_dns(lease, &nameservers, &nameservers_size);
 765                 if (r >= 0) {
 766                         r = manager_update_resolv_conf(link->manager);
 767                         if (r < 0)
 768                                 log_error("Failed to update resolv.conf");
 769                 }
 770         }
 771
 772         if (link->network->dhcp_mtu) {
 773                 uint16_t mtu;
 774
 775                 r = sd_dhcp_lease_get_mtu(lease, &mtu);
 776                 if (r >= 0) {
 777                         r = link_set_mtu(link, mtu);
 778                         if (r < 0)
 779                                 log_error_link(link, "Failed to set MTU "
 780                                                "to %" PRIu16, mtu);
 781                 }
 782         }
 783
 784         if (link->network->dhcp_hostname) {
 785                 const char *hostname;
 786
 787                 r = sd_dhcp_lease_get_hostname(lease, &hostname);
 788                 if (r >= 0) {
 789                         r = set_hostname(link->manager->bus, hostname);
 790                         if (r < 0)
 791                                 log_error("Failed to set transient hostname "
 792                                           "to '%s'", hostname);
 793                 }
 794         }
 795
 796         link_enter_set_addresses(link);
 797
 798         return 0;
 799 }
 800
 801 static void dhcp_handler(sd_dhcp_client *client, int event, void *userdata) {
 802         Link *link = userdata;
 803         int r = 0;
 804
 805         assert(link);
 806         assert(link->network);
 807         assert(link->manager);
 808
 809         if (link->state == LINK_STATE_FAILED)
 810                 return;
 811
 812         switch (event) {
 813                 case DHCP_EVENT_NO_LEASE:
 814                         log_debug_link(link, "IP address in use.");
 815                         break;
 816                 case DHCP_EVENT_EXPIRED:
 817                 case DHCP_EVENT_STOP:
 818                 case DHCP_EVENT_IP_CHANGE:
 819                         if (link->network->dhcp_critical) {
 820                                 log_error_link(link, "DHCPv4 connection considered system critical, "
 821                                                "ignoring request to reconfigure it.");
 822                                 return;
 823                         }
 824
 825                         if (link->dhcp_lease) {
 826                                 r = dhcp_lease_lost(link);
 827                                 if (r < 0) {
 828                                         link_enter_failed(link);
 829                                         return;
 830                                 }
 831                         }
 832
 833                         if (event == DHCP_EVENT_IP_CHANGE) {
 834                                 r = dhcp_lease_acquired(client, link);
 835                                 if (r < 0) {
 836                                         link_enter_failed(link);
 837                                         return;
 838                                 }
 839                         }
 840
 841                         if (event == DHCP_EVENT_EXPIRED && link->network->ipv4ll) {
 842                                 if (!sd_ipv4ll_is_running(link->ipv4ll))
 843                                         r = sd_ipv4ll_start(link->ipv4ll);
 844                                 else if (ipv4ll_is_bound(link->ipv4ll))
 845                                         r = ipv4ll_address_update(link, false);
 846                                 if (r < 0) {
 847                                         link_enter_failed(link);
 848                                         return;
 849                                 }
 850                         }
 851
 852                         break;
 853                 case DHCP_EVENT_IP_ACQUIRE:
 854                         r = dhcp_lease_acquired(client, link);
 855                         if (r < 0) {
 856                                 link_enter_failed(link);
 857                                 return;
 858                         }
 859                         if (link->ipv4ll) {
 860                                 if (ipv4ll_is_bound(link->ipv4ll))
 861                                         r = ipv4ll_address_update(link, true);
 862                                 else
 863                                         r = sd_ipv4ll_stop(link->ipv4ll);
 864                                 if (r < 0) {
 865                                         link_enter_failed(link);
 866                                         return;
 867                                 }
 868                         }
 869                         break;
 870                 default:
 871                         if (event < 0)
 872                                 log_warning_link(link, "DHCP error: %s", strerror(-event));
 873                         else
 874                                 log_warning_link(link, "DHCP unknown event: %d", event);
 875                         break;
 876         }
 877
 878         return;
 879 }
 880
 881 static int ipv4ll_address_update(Link *link, bool deprecate) {
 882         int r;
 883         struct in_addr addr;
 884
 885         assert(link);
 886
 887         r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
 888         if (r >= 0) {
 889                 _cleanup_address_free_ Address *address = NULL;
 890
 891                 log_debug_link(link, "IPv4 link-local %s %u.%u.%u.%u",
 892                                deprecate ? "deprecate" : "approve",
 893                                ADDRESS_FMT_VAL(addr));
 894
 895                 r = address_new_dynamic(&address);
 896                 if (r < 0) {
 897                         log_error_link(link, "Could not allocate address: %s", strerror(-r));
 898                         return r;
 899                 }
 900
 901                 address->family = AF_INET;
 902                 address->in_addr.in = addr;
 903                 address->prefixlen = 16;
 904                 address->scope = RT_SCOPE_LINK;
 905                 address->cinfo.ifa_prefered = deprecate ? 0 : CACHE_INFO_INFINITY_LIFE_TIME;
 906                 address->broadcast.s_addr = address->in_addr.in.s_addr | htonl(0xfffffffflu >> address->prefixlen);
 907
 908                 address_update(address, link, &address_update_handler);
 909         }
 910
 911         return 0;
 912
 913 }
 914
 915 static int ipv4ll_address_lost(Link *link) {
 916         int r;
 917         struct in_addr addr;
 918
 919         assert(link);
 920
 921         r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
 922         if (r >= 0) {
 923                 _cleanup_address_free_ Address *address = NULL;
 924                 _cleanup_route_free_ Route *route = NULL;
 925
 926                 log_debug_link(link, "IPv4 link-local release %u.%u.%u.%u",
 927                                 ADDRESS_FMT_VAL(addr));
 928
 929                 r = address_new_dynamic(&address);
 930                 if (r < 0) {
 931                         log_error_link(link, "Could not allocate address: %s", strerror(-r));
 932                         return r;
 933                 }
 934
 935                 address->family = AF_INET;
 936                 address->in_addr.in = addr;
 937                 address->prefixlen = 16;
 938                 address->scope = RT_SCOPE_LINK;
 939
 940                 address_drop(address, link, &address_drop_handler);
 941
 942                 r = route_new_dynamic(&route);
 943                 if (r < 0) {
 944                         log_error_link(link, "Could not allocate route: %s",
 945                                        strerror(-r));
 946                         return r;
 947                 }
 948
 949                 route->family = AF_INET;
 950                 route->scope = RT_SCOPE_LINK;
 951                 route->metrics = 99;
 952
 953                 route_drop(route, link, &route_drop_handler);
 954         }
 955
 956         return 0;
 957 }
 958
 959 static bool ipv4ll_is_bound(sd_ipv4ll *ll) {
 960         int r;
 961         struct in_addr addr;
 962
 963         assert(ll);
 964
 965         r = sd_ipv4ll_get_address(ll, &addr);
 966         if (r < 0)
 967                 return false;
 968         return true;
 969 }
 970
 971 static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) {
 972         struct in_addr address;
 973         int r;
 974
 975         assert(ll);
 976         assert(link);
 977
 978         r = sd_ipv4ll_get_address(ll, &address);
 979         if (r < 0)
 980                 return r;
 981
 982         log_struct_link(LOG_INFO, link,
 983                         "MESSAGE=%s: IPv4 link-local address %u.%u.%u.%u",
 984                         link->ifname,
 985                         ADDRESS_FMT_VAL(address),
 986                         NULL);
 987
 988        link_enter_set_addresses(link);
 989
 990        return 0;
 991 }
 992
 993 static void ipv4ll_handler(sd_ipv4ll *ll, int event, void *userdata){
 994         Link *link = userdata;
 995         int r;
 996
 997         assert(link);
 998         assert(link->network);
 999         assert(link->manager);
1000
1001         switch(event) {
1002                 case IPV4LL_EVENT_STOP:
1003                 case IPV4LL_EVENT_CONFLICT:
1004                         r = ipv4ll_address_lost(link);
1005                         if (r < 0) {
1006                                 link_enter_failed(link);
1007                                 return;
1008                         }
1009                         break;
1010                 case IPV4LL_EVENT_BIND:
1011                         r = ipv4ll_address_claimed(ll, link);
1012                         if (r < 0) {
1013                                 link_enter_failed(link);
1014                                 return;
1015                         }
1016                         break;
1017                 default:
1018                         if (event < 0)
1019                                 log_warning_link(link, "IPv4 link-local error: %s", strerror(-event));
1020                         else
1021                                 log_warning_link(link, "IPv4 link-local unknown event: %d", event);
1022                         break;
1023         }
1024 }
1025
1026 static int link_acquire_conf(Link *link) {
1027         int r;
1028
1029         assert(link);
1030         assert(link->network);
1031         assert(link->manager);
1032         assert(link->manager->event);
1033
1034         if (link->network->ipv4ll) {
1035                 assert(link->ipv4ll);
1036
1037                 log_debug_link(link, "acquiring IPv4 link-local address");
1038
1039                 r = sd_ipv4ll_start(link->ipv4ll);
1040                 if (r < 0)
1041                         return r;
1042         }
1043
1044         if (link->network->dhcp) {
1045                 assert(link->dhcp_client);
1046
1047                 log_debug_link(link, "acquiring DHCPv4 lease");
1048
1049                 r = sd_dhcp_client_start(link->dhcp_client);
1050                 if (r < 0)
1051                         return r;
1052         }
1053
1054         return 0;
1055 }
1056
1057 static int link_update_flags(Link *link, unsigned flags) {
1058         unsigned flags_added, flags_removed, generic_flags;
1059         bool carrier_gained, carrier_lost;
1060         int r;
1061
1062         assert(link);
1063
1064         if (link->state == LINK_STATE_FAILED)
1065                 return 0;
1066
1067         if (link->flags == flags)
1068                 return 0;
1069
1070         flags_added = (link->flags ^ flags) & flags;
1071         flags_removed = (link->flags ^ flags) & link->flags;
1072         generic_flags = ~(IFF_UP | IFF_LOWER_UP | IFF_DORMANT | IFF_DEBUG |
1073                           IFF_MULTICAST | IFF_BROADCAST | IFF_PROMISC |
1074                           IFF_NOARP | IFF_MASTER | IFF_SLAVE);
1075
1076         /* consider link to have carrier when LOWER_UP and !DORMANT
1077
1078            TODO: use proper operstates once we start supporting 802.1X
1079
1080            see Documentation/networking/operstates.txt in the kernel sources
1081          */
1082         carrier_gained = (((flags_added & IFF_LOWER_UP) && !(flags & IFF_DORMANT)) ||
1083                           ((flags_removed & IFF_DORMANT) && (flags & IFF_LOWER_UP)));
1084         carrier_lost = ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT)) &&
1085                        ((flags_removed & IFF_LOWER_UP) || (flags_added & IFF_DORMANT));
1086
1087         link->flags = flags;
1088
1089         if (!link->network)
1090                 /* not currently managing this link
1091                    we track state changes, but don't log them
1092                    they will be logged if and when a network is
1093                    applied */
1094                 return 0;
1095
1096         if (flags_added & IFF_UP)
1097                 log_info_link(link, "link is up");
1098         else if (flags_removed & IFF_UP)
1099                 log_info_link(link, "link is down");
1100
1101         if (flags_added & IFF_LOWER_UP)
1102                 log_debug_link(link, "link is lower up");
1103         else if (flags_removed & IFF_LOWER_UP)
1104                 log_debug_link(link, "link is lower down");
1105
1106         if (flags_added & IFF_DORMANT)
1107                 log_debug_link(link, "link is dormant");
1108         else if (flags_removed & IFF_DORMANT)
1109                 log_debug_link(link, "link is not dormant");
1110
1111         if (flags_added & IFF_DEBUG)
1112                 log_debug_link(link, "debugging enabled in the kernel");
1113         else if (flags_removed & IFF_DEBUG)
1114                 log_debug_link(link, "debugging disabled in the kernel");
1115
1116         if (flags_added & IFF_MULTICAST)
1117                 log_debug_link(link, "multicast enabled");
1118         else if (flags_removed & IFF_MULTICAST)
1119                 log_debug_link(link, "multicast disabled");
1120
1121         if (flags_added & IFF_BROADCAST)
1122                 log_debug_link(link, "broadcast enabled");
1123         else if (flags_removed & IFF_BROADCAST)
1124                 log_debug_link(link, "broadcast disabled");
1125
1126         if (flags_added & IFF_PROMISC)
1127                 log_debug_link(link, "promiscuous mode enabled");
1128         else if (flags_removed & IFF_PROMISC)
1129                 log_debug_link(link, "promiscuous mode disabled");
1130
1131         if (flags_added & IFF_NOARP)
1132                 log_debug_link(link, "ARP protocol disabled");
1133         else if (flags_removed & IFF_NOARP)
1134                 log_debug_link(link, "ARP protocol enabled");
1135
1136         if (flags_added & IFF_MASTER)
1137                 log_debug_link(link, "link is master");
1138         else if (flags_removed & IFF_MASTER)
1139                 log_debug_link(link, "link is no longer master");
1140
1141         if (flags_added & IFF_SLAVE)
1142                 log_debug_link(link, "link is slave");
1143         else if (flags_removed & IFF_SLAVE)
1144                 log_debug_link(link, "link is no longer slave");
1145
1146         /* link flags are currently at most 18 bits, let's default to printing 20 */
1147         if (flags_added & generic_flags)
1148                 log_debug_link(link, "unknown link flags gained: %#.5x (ignoring)",
1149                                flags_added & generic_flags);
1150
1151         if (flags_removed & generic_flags)
1152                 log_debug_link(link, "unknown link flags lost: %#.5x (ignoring)",
1153                                flags_removed & generic_flags);
1154
1155         if (carrier_gained) {
1156                 log_info_link(link, "gained carrier");
1157
1158                 if (link->network->dhcp || link->network->ipv4ll) {
1159                         r = link_acquire_conf(link);
1160                         if (r < 0) {
1161                                 log_warning_link(link, "Could not acquire configuration: %s", strerror(-r));
1162                                 link_enter_failed(link);
1163                                 return r;
1164                         }
1165                 }
1166         } else if (carrier_lost) {
1167                 log_info_link(link, "lost carrier");
1168
1169                 if (link->network->dhcp) {
1170                         r = sd_dhcp_client_stop(link->dhcp_client);
1171                         if (r < 0) {
1172                                 log_warning_link(link, "Could not stop DHCPv4 client: %s", strerror(-r));
1173                                 link_enter_failed(link);
1174                                 return r;
1175                         }
1176                 }
1177
1178                 if (link->network->ipv4ll) {
1179                         r = sd_ipv4ll_stop(link->ipv4ll);
1180                         if (r < 0) {
1181                                 log_warning_link(link, "Could not stop IPv4 link-local: %s", strerror(-r));
1182                                 link_enter_failed(link);
1183                                 return r;
1184                         }
1185                 }
1186         }
1187
1188         return 0;
1189 }
1190
1191 static int link_up_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
1192         Link *link = userdata;
1193         int r;
1194
1195         assert(link);
1196
1197         if (link->state == LINK_STATE_FAILED)
1198                 return 1;
1199
1200         r = sd_rtnl_message_get_errno(m);
1201         if (r >= 0)
1202                 link_update_flags(link, link->flags | IFF_UP);
1203         else
1204                 log_struct_link(LOG_WARNING, link,
1205                                 "MESSAGE=%s: could not bring up interface: %s",
1206                                 link->ifname, strerror(-r),
1207                                 "ERRNO=%d", -r,
1208                                 NULL);
1209         return 1;
1210 }
1211
1212 static int link_up(Link *link) {
1213         _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
1214         int r;
1215
1216         assert(link);
1217         assert(link->manager);
1218         assert(link->manager->rtnl);
1219
1220         log_debug_link(link, "bringing link up");
1221
1222         r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1223                                      RTM_SETLINK, link->ifindex);
1224         if (r < 0) {
1225                 log_error_link(link, "Could not allocate RTM_SETLINK message");
1226                 return r;
1227         }
1228
1229         r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1230         if (r < 0) {
1231                 log_error_link(link, "Could not set link flags: %s", strerror(-r));
1232                 return r;
1233         }
1234
1235         r = sd_rtnl_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
1236         if (r < 0) {
1237                 log_error_link(link,
1238                                "Could not send rtnetlink message: %s", strerror(-r));
1239                 return r;
1240         }
1241
1242         return 0;
1243 }
1244
1245 static int link_enslaved(Link *link) {
1246         int r;
1247
1248         assert(link);
1249         assert(link->state == LINK_STATE_ENSLAVING);
1250         assert(link->network);
1251
1252         if (!(link->flags & IFF_UP)) {
1253                 r = link_up(link);
1254                 if (r < 0) {
1255                         link_enter_failed(link);
1256                         return r;
1257                 }
1258         }
1259
1260         if (!link->network->dhcp && !link->network->ipv4ll)
1261                 return link_enter_set_addresses(link);
1262
1263         return 0;
1264 }
1265
1266 static int enslave_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
1267         Link *link = userdata;
1268         int r;
1269
1270         assert(link);
1271         assert(link->state == LINK_STATE_ENSLAVING || link->state == LINK_STATE_FAILED);
1272         assert(link->network);
1273
1274         link->enslaving --;
1275
1276         if (link->state == LINK_STATE_FAILED)
1277                 return 1;
1278
1279         r = sd_rtnl_message_get_errno(m);
1280         if (r < 0) {
1281                 log_struct_link(LOG_ERR, link,
1282                                 "MESSAGE=%s: could not enslave: %s",
1283                                 link->ifname, strerror(-r),
1284                                 "ERRNO=%d", -r,
1285                                 NULL);
1286                 link_enter_failed(link);
1287                 return 1;
1288         }
1289
1290         log_debug_link(link, "enslaved");
1291
1292         if (link->enslaving == 0)
1293                 link_enslaved(link);
1294
1295         return 1;
1296 }
1297
1298 static int link_enter_enslave(Link *link) {
1299         NetDev *vlan, *macvlan;
1300         Iterator i;
1301         int r;
1302
1303         assert(link);
1304         assert(link->network);
1305         assert(link->state == LINK_STATE_INITIALIZING);
1306
1307         link->state = LINK_STATE_ENSLAVING;
1308
1309         link_save(link);
1310
1311         if (!link->network->bridge && !link->network->bond &&
1312             hashmap_isempty(link->network->vlans) &&
1313             hashmap_isempty(link->network->macvlans))
1314                 return link_enslaved(link);
1315
1316         if (link->network->bridge) {
1317                 log_struct_link(LOG_DEBUG, link,
1318                                 "MESSAGE=%s: enslaving by '%s'",
1319                                 link->ifname, link->network->bridge->name,
1320                                 NETDEV(link->network->bridge),
1321                                 NULL);
1322
1323                 r = netdev_enslave(link->network->bridge, link, &enslave_handler);
1324                 if (r < 0) {
1325                         log_struct_link(LOG_WARNING, link,
1326                                         "MESSAGE=%s: could not enslave by '%s': %s",
1327                                         link->ifname, link->network->bridge->name, strerror(-r),
1328                                         NETDEV(link->network->bridge),
1329                                         NULL);
1330                         link_enter_failed(link);
1331                         return r;
1332                 }
1333
1334                 link->enslaving ++;
1335         }
1336
1337         if (link->network->bond) {
1338                 log_struct_link(LOG_DEBUG, link,
1339                                 "MESSAGE=%s: enslaving by '%s'",
1340                                 link->ifname, link->network->bond->name,
1341                                 NETDEV(link->network->bond),
1342                                 NULL);
1343
1344                 r = netdev_enslave(link->network->bond, link, &enslave_handler);
1345                 if (r < 0) {
1346                         log_struct_link(LOG_WARNING, link,
1347                                         "MESSAGE=%s: could not enslave by '%s': %s",
1348                                         link->ifname, link->network->bond->name, strerror(-r),
1349                                         NETDEV(link->network->bond),
1350                                         NULL);
1351                         link_enter_failed(link);
1352                         return r;
1353                 }
1354
1355                 link->enslaving ++;
1356         }
1357
1358         HASHMAP_FOREACH(vlan, link->network->vlans, i) {
1359                 log_struct_link(LOG_DEBUG, link,
1360                                 "MESSAGE=%s: enslaving by '%s'",
1361                                 link->ifname, vlan->name, NETDEV(vlan), NULL);
1362
1363                 r = netdev_enslave(vlan, link, &enslave_handler);
1364                 if (r < 0) {
1365                         log_struct_link(LOG_WARNING, link,
1366                                         "MESSAGE=%s: could not enslave by '%s': %s",
1367                                         link->ifname, vlan->name, strerror(-r),
1368                                         NETDEV(vlan), NULL);
1369                         link_enter_failed(link);
1370                         return r;
1371                 }
1372
1373                 link->enslaving ++;
1374         }
1375
1376         HASHMAP_FOREACH(macvlan, link->network->macvlans, i) {
1377                 log_struct_link(LOG_DEBUG, link,
1378                                 "MESSAGE=%s: enslaving by '%s'",
1379                                 link->ifname, macvlan->name, NETDEV(macvlan), NULL);
1380
1381                 r = netdev_enslave(macvlan, link, &enslave_handler);
1382                 if (r < 0) {
1383                         log_struct_link(LOG_WARNING, link,
1384                                         "MESSAGE=%s: could not enslave by '%s': %s",
1385                                         link->ifname, macvlan->name, strerror(-r),
1386                                         NETDEV(macvlan), NULL);
1387                         link_enter_failed(link);
1388                         return r;
1389                 }
1390
1391                 link->enslaving ++;
1392         }
1393
1394         return 0;
1395 }
1396
1397 static int link_configure(Link *link) {
1398         int r;
1399
1400         assert(link);
1401         assert(link->state == LINK_STATE_INITIALIZING);
1402
1403         if (link->network->ipv4ll) {
1404                 uint8_t seed[8];
1405                 r = sd_ipv4ll_new(&link->ipv4ll);
1406                 if (r < 0)
1407                         return r;
1408
1409                 if (link->udev_device) {
1410                         r = net_get_unique_predictable_data(link->udev_device, seed);
1411                         if (r >= 0) {
1412                                 r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed);
1413                                 if (r < 0)
1414                                         return r;
1415                         }
1416                 }
1417
1418                 r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
1419                 if (r < 0)
1420                         return r;
1421
1422                 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
1423                 if (r < 0)
1424                         return r;
1425
1426                 r = sd_ipv4ll_set_index(link->ipv4ll, link->ifindex);
1427                 if (r < 0)
1428                         return r;
1429
1430                 r = sd_ipv4ll_set_callback(link->ipv4ll, ipv4ll_handler, link);
1431                 if (r < 0)
1432                         return r;
1433         }
1434
1435         if (link->network->dhcp) {
1436                 r = sd_dhcp_client_new(&link->dhcp_client);
1437                 if (r < 0)
1438                         return r;
1439
1440                 r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
1441                 if (r < 0)
1442                         return r;
1443
1444                 r = sd_dhcp_client_set_mac(link->dhcp_client, &link->mac);
1445                 if (r < 0)
1446                         return r;
1447
1448                 r = sd_dhcp_client_set_index(link->dhcp_client, link->ifindex);
1449                 if (r < 0)
1450                         return r;
1451
1452                 r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp_handler, link);
1453                 if (r < 0)
1454                         return r;
1455
1456                 if (link->network->dhcp_mtu) {
1457                         r = sd_dhcp_client_set_request_option(link->dhcp_client, 26);
1458                         if (r < 0)
1459                                 return r;
1460                 }
1461         }
1462
1463         return link_enter_enslave(link);
1464 }
1465
1466 int link_initialized(Link *link, struct udev_device *device) {
1467         Network *network;
1468         unsigned flags;
1469         int r;
1470
1471         assert(link);
1472         assert(link->ifname);
1473         assert(link->manager);
1474
1475         if (link->state != LINK_STATE_INITIALIZING)
1476                 return 0;
1477
1478         if (device)
1479                 link->udev_device = udev_device_ref(device);
1480
1481         log_debug_link(link, "link initialized");
1482
1483         r = network_get(link->manager, device, link->ifname, &link->mac, &network);
1484         if (r == -ENOENT) {
1485                 link_enter_unmanaged(link);
1486                 return 0;
1487         } else if (r < 0)
1488                 return r;
1489
1490         r = network_apply(link->manager, network, link);
1491         if (r < 0)
1492                 return r;
1493
1494         r = link_configure(link);
1495         if (r < 0)
1496                 return r;
1497
1498         /* re-trigger all state updates */
1499         flags = link->flags;
1500         link->flags = 0;
1501         r = link_update_flags(link, flags);
1502         if (r < 0)
1503                 return r;
1504
1505         return 0;
1506 }
1507
1508 int link_add(Manager *m, sd_rtnl_message *message, Link **ret) {
1509         Link *link;
1510         _cleanup_udev_device_unref_ struct udev_device *device = NULL;
1511         char ifindex_str[2 + DECIMAL_STR_MAX(int)];
1512         int r;
1513
1514         assert(m);
1515         assert(message);
1516         assert(ret);
1517
1518         r = link_new(m, message, ret);
1519         if (r < 0)
1520                 return r;
1521
1522         link = *ret;
1523
1524         log_info_link(link, "link added");
1525
1526         if (detect_container(NULL) <= 0) {
1527                 /* not in a container, udev will be around */
1528                 sprintf(ifindex_str, "n%"PRIu64, link->ifindex);
1529                 device = udev_device_new_from_device_id(m->udev, ifindex_str);
1530                 if (!device) {
1531                         log_warning_link(link, "could not find udev device");
1532                         return -errno;
1533                 }
1534
1535                 if (udev_device_get_is_initialized(device) <= 0)
1536                         /* not yet ready */
1537                         return 0;
1538         }
1539
1540         r = link_initialized(link, device);
1541         if (r < 0)
1542                 return r;
1543
1544         return 0;
1545 }
1546
1547 int link_update(Link *link, sd_rtnl_message *m) {
1548         unsigned flags;
1549         struct ether_addr mac;
1550         char *ifname;
1551         int r;
1552
1553         assert(link);
1554         assert(link->ifname);
1555         assert(m);
1556
1557         if (link->state == LINK_STATE_FAILED || link->state == LINK_STATE_UNMANAGED)
1558                 return 0;
1559
1560         r = sd_rtnl_message_read_string(m, IFLA_IFNAME, &ifname);
1561         if (r >= 0 && !streq(ifname, link->ifname)) {
1562                 log_info_link(link, "renamed to %s", ifname);
1563
1564                 free(link->ifname);
1565                 link->ifname = strdup(ifname);
1566                 if (!link->ifname)
1567                         return -ENOMEM;
1568         }
1569
1570         if (!link->original_mtu) {
1571                 r = sd_rtnl_message_read_u16(m, IFLA_MTU, &link->original_mtu);
1572                 if (r >= 0)
1573                         log_debug_link(link, "saved original MTU: %"
1574                                        PRIu16, link->original_mtu);
1575         }
1576
1577         /* The kernel may broadcast NEWLINK messages without the MAC address
1578            set, simply ignore them. */
1579         r = sd_rtnl_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
1580         if (r >= 0) {
1581                 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet, ETH_ALEN)) {
1582
1583                         memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet, ETH_ALEN);
1584
1585                         log_debug_link(link, "MAC address: "
1586                                        "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
1587                                        mac.ether_addr_octet[0],
1588                                        mac.ether_addr_octet[1],
1589                                        mac.ether_addr_octet[2],
1590                                        mac.ether_addr_octet[3],
1591                                        mac.ether_addr_octet[4],
1592                                        mac.ether_addr_octet[5]);
1593
1594                         if (link->ipv4ll) {
1595                                 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
1596                                 if (r < 0) {
1597                                         log_warning_link(link, "Could not update MAC "
1598                                                          "address in IPv4LL client: %s",
1599                                                          strerror(-r));
1600                                         return r;
1601                                 }
1602                         }
1603
1604                         if (link->dhcp_client) {
1605                                 r = sd_dhcp_client_set_mac(link->dhcp_client, &link->mac);
1606                                 if (r < 0) {
1607                                         log_warning_link(link, "Could not update MAC "
1608                                                          "address in DHCP client: %s",
1609                                                          strerror(-r));
1610                                         return r;
1611                                 }
1612                         }
1613                 }
1614         }
1615
1616         r = sd_rtnl_message_link_get_flags(m, &flags);
1617         if (r < 0) {
1618                 log_warning_link(link, "Could not get link flags");
1619                 return r;
1620         }
1621
1622         return link_update_flags(link, flags);
1623 }
1624
1625 int link_save(Link *link) {
1626         _cleanup_free_ char *temp_path = NULL;
1627         _cleanup_fclose_ FILE *f = NULL;
1628         const char *state;
1629         int r;
1630
1631         assert(link);
1632         assert(link->state_file);
1633
1634         state = link_state_to_string(link->state);
1635         assert(state);
1636
1637         r = fopen_temporary(link->state_file, &f, &temp_path);
1638         if (r < 0)
1639                 goto finish;
1640
1641         fchmod(fileno(f), 0644);
1642
1643         fprintf(f,
1644                 "# This is private data. Do not parse.\n"
1645                 "STATE=%s\n", state);
1646
1647         if (link->dhcp_lease) {
1648                 _cleanup_free_ char *lease_file = NULL;
1649
1650                 r = asprintf(&lease_file, "/run/systemd/network/leases/%"PRIu64,
1651                              link->ifindex);
1652                 if (r < 0)
1653                         return -ENOMEM;
1654
1655                 r = dhcp_lease_save(link->dhcp_lease, lease_file);
1656                 if (r < 0)
1657                         goto finish;
1658
1659                 fprintf(f, "DHCP_LEASE=%s\n", lease_file);
1660         }
1661
1662         fflush(f);
1663
1664         if (ferror(f) || rename(temp_path, link->state_file) < 0) {
1665                 r = -errno;
1666                 unlink(link->state_file);
1667                 unlink(temp_path);
1668         }
1669
1670 finish:
1671         if (r < 0)
1672                 log_error("Failed to save link data %s: %s", link->state_file, strerror(-r));
1673
1674         return r;
1675 }
1676
1677 static const char* const link_state_table[_LINK_STATE_MAX] = {
1678         [LINK_STATE_INITIALIZING] = "configuring",
1679         [LINK_STATE_ENSLAVING] = "configuring",
1680         [LINK_STATE_SETTING_ADDRESSES] = "configuring",
1681         [LINK_STATE_SETTING_ROUTES] = "configuring",
1682         [LINK_STATE_CONFIGURED] = "configured",
1683         [LINK_STATE_UNMANAGED] = "unmanaged",
1684         [LINK_STATE_FAILED] = "failed",
1685 };
1686
1687 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);