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 "util.h"
  28
  29 int link_new(Manager *manager, struct udev_device *device, Link **ret) {
  30         _cleanup_link_free_ Link *link = NULL;
  31         const char *mac;
  32         struct ether_addr *mac_addr;
  33         const char *ifname;
  34         int r;
  35
  36         assert(device);
  37         assert(ret);
  38
  39         link = new0(Link, 1);
  40         if (!link)
  41                 return -ENOMEM;
  42
  43         link->manager = manager;
  44         link->state = _LINK_STATE_INVALID;
  45
  46         link->ifindex = udev_device_get_ifindex(device);
  47         if (link->ifindex <= 0)
  48                 return -EINVAL;
  49
  50         mac = udev_device_get_sysattr_value(device, "address");
  51         if (mac) {
  52                 mac_addr = ether_aton(mac);
  53                 if (mac_addr)
  54                         memcpy(&link->mac, mac_addr, sizeof(struct ether_addr));
  55         }
  56
  57         ifname = udev_device_get_sysname(device);
  58         link->ifname = strdup(ifname);
  59
  60         r = hashmap_put(manager->links, &link->ifindex, link);
  61         if (r < 0)
  62                 return r;
  63
  64         *ret = link;
  65         link = NULL;
  66
  67         return 0;
  68 }
  69
  70 void link_free(Link *link) {
  71         if (!link)
  72                 return;
  73
  74         assert(link->manager);
  75
  76         if (link->dhcp)
  77                 sd_dhcp_client_free(link->dhcp);
  78
  79         route_free(link->dhcp_route);
  80         link->dhcp_route = NULL;
  81
  82         address_free(link->dhcp_address);
  83         link->dhcp_address = NULL;
  84
  85         hashmap_remove(link->manager->links, &link->ifindex);
  86
  87         free(link->ifname);
  88
  89         free(link);
  90 }
  91
  92 int link_add(Manager *m, struct udev_device *device, Link **ret) {
  93         Link *link;
  94         Network *network;
  95         int r;
  96         uint64_t ifindex;
  97         const char *devtype;
  98
  99         assert(m);
 100         assert(device);
 101
 102         ifindex = udev_device_get_ifindex(device);
 103         link = hashmap_get(m->links, &ifindex);
 104         if (link) {
 105                 *ret = link;
 106                 return -EEXIST;
 107         }
 108
 109         r = link_new(m, device, &link);
 110         if (r < 0)
 111                 return r;
 112
 113         *ret = link;
 114
 115         devtype = udev_device_get_devtype(device);
 116         if (streq_ptr(devtype, "bridge")) {
 117                 r = bridge_set_link(m, link);
 118                 if (r < 0 && r != -ENOENT)
 119                         return r;
 120         }
 121
 122         r = network_get(m, device, &network);
 123         if (r < 0)
 124                 return r == -ENOENT ? 0 : r;
 125
 126         r = network_apply(m, network, link);
 127         if (r < 0)
 128                 return r;
 129
 130         return 0;
 131 }
 132
 133 static int link_enter_configured(Link *link) {
 134         assert(link);
 135         assert(link->state == LINK_STATE_SETTING_ROUTES);
 136
 137         log_info_link(link, "link configured");
 138
 139         link->state = LINK_STATE_CONFIGURED;
 140
 141         return 0;
 142 }
 143
 144 static void link_enter_failed(Link *link) {
 145         assert(link);
 146
 147         log_warning_link(link, "failed");
 148
 149         link->state = LINK_STATE_FAILED;
 150 }
 151
 152 static int route_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
 153         Link *link = userdata;
 154         int r;
 155
 156         assert(link->route_messages > 0);
 157         assert(link->state == LINK_STATE_SETTING_ADDRESSES ||
 158                link->state == LINK_STATE_SETTING_ROUTES ||
 159                link->state == LINK_STATE_FAILED);
 160
 161         link->route_messages --;
 162
 163         if (link->state == LINK_STATE_FAILED)
 164                 return 1;
 165
 166         r = sd_rtnl_message_get_errno(m);
 167         if (r < 0 && r != -EEXIST)
 168                 log_warning_link(link, "could not set route: %s", strerror(-r));
 169
 170         /* we might have received an old reply after moving back to SETTING_ADDRESSES,
 171          * ignore it */
 172         if (link->route_messages == 0 && link->state == LINK_STATE_SETTING_ROUTES) {
 173                 log_debug_link(link, "routes set");
 174                 link_enter_configured(link);
 175         }
 176
 177         return 1;
 178 }
 179
 180 static int link_enter_set_routes(Link *link) {
 181         Route *route;
 182         int r;
 183
 184         assert(link);
 185         assert(link->network);
 186         assert(link->state == LINK_STATE_SETTING_ADDRESSES);
 187
 188         link->state = LINK_STATE_SETTING_ROUTES;
 189
 190         if (!link->network->static_routes && !link->dhcp_route)
 191                 return link_enter_configured(link);
 192
 193         log_debug_link(link, "setting routes");
 194
 195         LIST_FOREACH(static_routes, route, link->network->static_routes) {
 196                 r = route_configure(route, link, &route_handler);
 197                 if (r < 0) {
 198                         log_warning_link(link,
 199                                          "could not set routes: %s", strerror(-r));
 200                         link_enter_failed(link);
 201                         return r;
 202                 }
 203
 204                 link->route_messages ++;
 205         }
 206
 207         if (link->dhcp_route) {
 208                 r = route_configure(link->dhcp_route, link, &route_handler);
 209                 if (r < 0) {
 210                         log_warning_link(link,
 211                                          "could not set routes: %s", strerror(-r));
 212                         link_enter_failed(link);
 213                         return r;
 214                 }
 215
 216                 link->route_messages ++;
 217         }
 218
 219         return 0;
 220 }
 221
 222 static int address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
 223         Link *link = userdata;
 224         int r;
 225
 226         assert(m);
 227         assert(link);
 228         assert(link->ifname);
 229         assert(link->addr_messages > 0);
 230         assert(link->state == LINK_STATE_SETTING_ADDRESSES || link->state == LINK_STATE_FAILED);
 231
 232         link->addr_messages --;
 233
 234         if (link->state == LINK_STATE_FAILED)
 235                 return 1;
 236
 237         r = sd_rtnl_message_get_errno(m);
 238         if (r < 0 && r != -EEXIST)
 239                 log_struct_link(LOG_ERR, link,
 240                                 "MESSAGE=%s: could not set address: %s",
 241                                 link->ifname, strerror(-r),
 242                                 "ERRNO=%d", -r,
 243                                 NULL);
 244
 245         if (link->addr_messages == 0) {
 246                 log_debug_link(link, "addresses set");
 247                 link_enter_set_routes(link);
 248         }
 249
 250         return 1;
 251 }
 252
 253 static int link_enter_set_addresses(Link *link) {
 254         Address *address;
 255         int r;
 256
 257         assert(link);
 258         assert(link->network);
 259         assert(link->state != _LINK_STATE_INVALID);
 260
 261         link->state = LINK_STATE_SETTING_ADDRESSES;
 262
 263         if (!link->network->static_addresses && !link->dhcp_address)
 264                 return link_enter_set_routes(link);
 265
 266         log_debug_link(link, "setting addresses");
 267
 268         LIST_FOREACH(static_addresses, address, link->network->static_addresses) {
 269                 r = address_configure(address, link, &address_handler);
 270                 if (r < 0) {
 271                         log_warning_link(link,
 272                                          "could not set addresses: %s", strerror(-r));
 273                         link_enter_failed(link);
 274                         return r;
 275                 }
 276
 277                 link->addr_messages ++;
 278         }
 279
 280         if (link->dhcp_address) {
 281                 r = address_configure(link->dhcp_address, link, &address_handler);
 282                 if (r < 0) {
 283                         log_warning_link(link,
 284                                          "could not set addresses: %s", strerror(-r));
 285                         link_enter_failed(link);
 286                         return r;
 287                 }
 288
 289                 link->addr_messages ++;
 290         }
 291
 292         return 0;
 293 }
 294
 295 static int address_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
 296         Link *link = userdata;
 297         int r;
 298
 299         assert(m);
 300         assert(link);
 301         assert(link->ifname);
 302
 303         if (link->state == LINK_STATE_FAILED)
 304                 return 1;
 305
 306         r = sd_rtnl_message_get_errno(m);
 307         if (r < 0 && r != -EEXIST)
 308                 log_warning_link(link, "could not drop address: %s", strerror(-r));
 309
 310         return 1;
 311 }
 312
 313 static void dhcp_handler(sd_dhcp_client *client, int event, void *userdata) {
 314         Link *link = userdata;
 315         struct in_addr address;
 316         struct in_addr netmask;
 317         struct in_addr gateway;
 318         int prefixlen;
 319         int r;
 320
 321         assert(link);
 322         assert(link->network);
 323
 324         if (link->state == LINK_STATE_FAILED)
 325                 return;
 326
 327         if (event < 0) {
 328                 log_warning_link(link, "DHCP error: %s", strerror(-event));
 329                 link_enter_failed(link);
 330                 return;
 331         }
 332
 333         if (event == DHCP_EVENT_NO_LEASE)
 334                 log_debug_link(link, "IP address in use.");
 335
 336         if (event == DHCP_EVENT_IP_CHANGE || event == DHCP_EVENT_EXPIRED ||
 337             event == DHCP_EVENT_STOP) {
 338                 if (link->dhcp_address) {
 339                         address_drop(link->dhcp_address, link, address_drop_handler);
 340
 341                         address_free(link->dhcp_address);
 342                         link->dhcp_address = NULL;
 343                 }
 344
 345                 if (link->dhcp_route) {
 346                         route_free(link->dhcp_route);
 347                         link->dhcp_route = NULL;
 348                 }
 349         }
 350
 351         r = sd_dhcp_client_get_address(client, &address);
 352         if (r < 0) {
 353                 log_warning_link(link, "DHCP error: no address");
 354                 link_enter_failed(link);
 355                 return;
 356         }
 357
 358         r = sd_dhcp_client_get_netmask(client, &netmask);
 359         if (r < 0) {
 360                 log_warning_link(link, "DHCP error: no netmask");
 361                 link_enter_failed(link);
 362                 return;
 363         }
 364
 365         prefixlen = sd_dhcp_client_prefixlen(&netmask);
 366         if (prefixlen < 0) {
 367                 log_warning_link(link, "DHCP error: no prefixlen");
 368                 link_enter_failed(link);
 369                 return;
 370         }
 371
 372         r = sd_dhcp_client_get_router(client, &gateway);
 373         if (r < 0) {
 374                 log_warning_link(link, "DHCP error: no router");
 375                 link_enter_failed(link);
 376                 return;
 377         }
 378
 379         if (event == DHCP_EVENT_IP_CHANGE || event == DHCP_EVENT_IP_ACQUIRE) {
 380                 _cleanup_address_free_ Address *addr = NULL;
 381                 _cleanup_route_free_ Route *rt = NULL;
 382                 struct in_addr **nameservers;
 383
 384                 log_struct_link(LOG_INFO, link,
 385                                 "MESSAGE=%s: DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u",
 386                                 link->ifname,
 387                                 ADDRESS_FMT_VAL(address),
 388                                 prefixlen,
 389                                 ADDRESS_FMT_VAL(gateway),
 390                                 "ADDRESS=%u.%u.%u.%u",
 391                                 ADDRESS_FMT_VAL(address),
 392                                 "PREFIXLEN=%u",
 393                                 prefixlen,
 394                                 "GATEWAY=%u.%u.%u.%u",
 395                                 ADDRESS_FMT_VAL(gateway),
 396                                 NULL);
 397
 398                 r = address_new_dynamic(&addr);
 399                 if (r < 0) {
 400                         log_error_link(link, "Could not allocate address");
 401                         link_enter_failed(link);
 402                         return;
 403                 }
 404
 405                 addr->family = AF_INET;
 406                 addr->in_addr.in = address;
 407                 addr->prefixlen = prefixlen;
 408                 addr->netmask = netmask;
 409
 410                 r = route_new_dynamic(&rt);
 411                 if (r < 0) {
 412                         log_error_link(link, "Could not allocate route");
 413                         link_enter_failed(link);
 414                         return;
 415                 }
 416
 417                 rt->family = AF_INET;
 418                 rt->in_addr.in = gateway;
 419
 420                 link->dhcp_address = addr;
 421                 link->dhcp_route = rt;
 422                 addr = NULL;
 423                 rt = NULL;
 424
 425                 if (link->network->dhcp_dns) {
 426                         r = sd_dhcp_client_get_dns(client, &nameservers);
 427                         if (r >= 0) {
 428                                 r = manager_update_resolv_conf(link->manager);
 429                                 if (r < 0)
 430                                         log_error("Failed to update resolv.conf");
 431                         }
 432                 }
 433
 434                 link_enter_set_addresses(link);
 435         }
 436
 437         return;
 438 }
 439
 440 static int link_acquire_conf(Link *link) {
 441         int r;
 442
 443         assert(link);
 444         assert(link->network);
 445         assert(link->network->dhcp);
 446         assert(link->manager);
 447         assert(link->manager->event);
 448
 449         if (!link->dhcp) {
 450                 link->dhcp = sd_dhcp_client_new(link->manager->event);
 451                 if (!link->dhcp)
 452                         return -ENOMEM;
 453
 454                 r = sd_dhcp_client_set_index(link->dhcp, link->ifindex);
 455                 if (r < 0)
 456                         return r;
 457
 458                 r = sd_dhcp_client_set_mac(link->dhcp, &link->mac);
 459                 if (r < 0)
 460                         return r;
 461
 462                 r = sd_dhcp_client_set_callback(link->dhcp, dhcp_handler, link);
 463                 if (r < 0)
 464                         return r;
 465         }
 466
 467         log_debug_link(link, "acquiring DHCPv4 lease");
 468
 469         r = sd_dhcp_client_start(link->dhcp);
 470         if (r < 0)
 471                 return r;
 472
 473         return 0;
 474 }
 475
 476 static int link_update_flags(Link *link, unsigned flags) {
 477         int r;
 478
 479         assert(link);
 480         assert(link->network);
 481
 482         if (link->state == LINK_STATE_FAILED)
 483                 return 0;
 484
 485         if (link->flags == flags) {
 486                 log_debug_link(link, "link status unchanged: %#.8x", flags);
 487                 return 0;
 488         }
 489
 490         if ((link->flags & IFF_UP) != (flags & IFF_UP))
 491                 log_info_link(link,
 492                               "power %s", flags & IFF_UP ? "on": "off");
 493
 494         if ((link->flags & IFF_LOWER_UP) != (flags & IFF_LOWER_UP)) {
 495                 if (flags & IFF_LOWER_UP) {
 496                         log_info_link(link, "carrier on");
 497
 498                         if (link->network->dhcp) {
 499                                 r = link_acquire_conf(link);
 500                                 if (r < 0) {
 501                                         link_enter_failed(link);
 502                                         return r;
 503                                 }
 504                         }
 505                 } else {
 506                         log_info_link(link, "carrier off");
 507
 508                         if (link->network->dhcp) {
 509                                 r = sd_dhcp_client_stop(link->dhcp);
 510                                 if (r < 0) {
 511                                         link_enter_failed(link);
 512                                         return r;
 513                                 }
 514                         }
 515                 }
 516         }
 517
 518         log_debug_link(link,
 519                        "link status updated: %#.8x -> %#.8x", link->flags, flags);
 520
 521         link->flags = flags;
 522
 523         return 0;
 524 }
 525
 526 static int link_up_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
 527         Link *link = userdata;
 528         int r;
 529
 530         assert(link);
 531
 532         if (link->state == LINK_STATE_FAILED)
 533                 return 1;
 534
 535         r = sd_rtnl_message_get_errno(m);
 536         if (r < 0) {
 537                 log_warning_link(link,
 538                                  "could not bring up interface: %s", strerror(-r));
 539                 link_enter_failed(link);
 540         }
 541
 542         link_update_flags(link, link->flags | IFF_UP);
 543
 544         return 1;
 545 }
 546
 547 static int link_up(Link *link) {
 548         _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *req = NULL;
 549         int r;
 550
 551         assert(link);
 552         assert(link->manager);
 553         assert(link->manager->rtnl);
 554
 555         log_debug_link(link, "bringing link up");
 556
 557         r = sd_rtnl_message_link_new(RTM_SETLINK, link->ifindex, &req);
 558         if (r < 0) {
 559                 log_error_link(link, "Could not allocate RTM_SETLINK message");
 560                 return r;
 561         }
 562
 563         r = sd_rtnl_message_link_set_flags(req, IFF_UP);
 564         if (r < 0) {
 565                 log_error_link(link, "Could not set link flags: %s", strerror(-r));
 566                 return r;
 567         }
 568
 569         r = sd_rtnl_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
 570         if (r < 0) {
 571                 log_error_link(link,
 572                                "Could not send rtnetlink message: %s", strerror(-r));
 573                 return r;
 574         }
 575
 576         return 0;
 577 }
 578
 579 static int link_bridge_joined(Link *link) {
 580         int r;
 581
 582         assert(link);
 583         assert(link->state == LINK_STATE_JOINING_BRIDGE);
 584         assert(link->network);
 585
 586         r = link_up(link);
 587         if (r < 0) {
 588                 link_enter_failed(link);
 589                 return r;
 590         }
 591
 592         if (!link->network->dhcp)
 593                 return link_enter_set_addresses(link);
 594
 595         return 0;
 596 }
 597
 598 static int bridge_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
 599         Link *link = userdata;
 600         int r;
 601
 602         assert(link);
 603         assert(link->state == LINK_STATE_JOINING_BRIDGE || link->state == LINK_STATE_FAILED);
 604         assert(link->network);
 605
 606         if (link->state == LINK_STATE_FAILED)
 607                 return 1;
 608
 609         r = sd_rtnl_message_get_errno(m);
 610         if (r < 0) {
 611                 log_struct_link(LOG_ERR, link,
 612                                 "MESSAGE=%s: could not join bridge '%s': %s",
 613                                 link->ifname, link->network->bridge->name, strerror(-r),
 614                                 BRIDGE(link->network->bridge),
 615                                 NULL);
 616                 link_enter_failed(link);
 617                 return 1;
 618         }
 619
 620         log_struct_link(LOG_DEBUG, link,
 621                         "MESSAGE=%s: joined bridge '%s'",
 622                         link->network->bridge->name,
 623                         BRIDGE(link->network->bridge),
 624                         NULL);
 625
 626         link_bridge_joined(link);
 627
 628         return 1;
 629 }
 630
 631 static int link_enter_join_bridge(Link *link) {
 632         int r;
 633
 634         assert(link);
 635         assert(link->network);
 636         assert(link->state == _LINK_STATE_INVALID);
 637
 638         link->state = LINK_STATE_JOINING_BRIDGE;
 639
 640         if (!link->network->bridge)
 641                 return link_bridge_joined(link);
 642
 643         log_struct_link(LOG_DEBUG, link,
 644                         "MESSAGE=%s: joining bridge '%s'",
 645                         link->network->bridge->name,
 646                         BRIDGE(link->network->bridge),
 647                         NULL);
 648         log_debug_link(link, "joining bridge");
 649
 650         r = bridge_join(link->network->bridge, link, &bridge_handler);
 651         if (r < 0) {
 652                 log_struct_link(LOG_WARNING, link,
 653                                 "MESSAGE=%s: could not join bridge '%s': %s",
 654                                 link->network->bridge->name, strerror(-r),
 655                                 BRIDGE(link->network->bridge),
 656                                 NULL);
 657                 link_enter_failed(link);
 658                 return r;
 659         }
 660
 661         return 0;
 662 }
 663
 664 static int link_get_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
 665         Link *link = userdata;
 666         int r;
 667
 668         assert(link);
 669
 670         if (link->state == LINK_STATE_FAILED)
 671                 return 1;
 672
 673         r = sd_rtnl_message_get_errno(m);
 674         if (r < 0) {
 675                 log_warning_link(link, "could not get state: %s", strerror(-r));
 676                 link_enter_failed(link);
 677         }
 678
 679         log_debug_link(link, "got link state");
 680
 681         link_update(link, m);
 682
 683         return 1;
 684 }
 685
 686 static int link_get(Link *link) {
 687         _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *req = NULL;
 688         int r;
 689
 690         assert(link);
 691         assert(link->manager);
 692         assert(link->manager->rtnl);
 693
 694         log_debug_link(link, "requesting link status");
 695
 696         r = sd_rtnl_message_link_new(RTM_GETLINK, link->ifindex, &req);
 697         if (r < 0) {
 698                 log_error_link(link, "Could not allocate RTM_GETLINK message");
 699                 return r;
 700         }
 701
 702         r = sd_rtnl_call_async(link->manager->rtnl, req, link_get_handler, link, 0, NULL);
 703         if (r < 0) {
 704                 log_error_link(link,
 705                                "Could not send rtnetlink message: %s", strerror(-r));
 706                 return r;
 707         }
 708
 709         return 0;
 710 }
 711
 712 int link_configure(Link *link) {
 713         int r;
 714
 715         assert(link);
 716         assert(link->network);
 717         assert(link->state == _LINK_STATE_INVALID);
 718
 719         r = link_get(link);
 720         if (r < 0) {
 721                 link_enter_failed(link);
 722                 return r;
 723         }
 724
 725         return link_enter_join_bridge(link);
 726 }
 727
 728 int link_update(Link *link, sd_rtnl_message *m) {
 729         unsigned flags;
 730         int r;
 731
 732         assert(link);
 733         assert(m);
 734
 735         if (link->state == LINK_STATE_FAILED)
 736                 return 0;
 737
 738         r = sd_rtnl_message_link_get_flags(m, &flags);
 739         if (r < 0) {
 740                 log_warning_link(link, "could not get link flags");
 741                 return r;
 742         }
 743
 744         return link_update_flags(link, flags);
 745 }