src/network/networkd-network.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 <ctype.h>
  23 #include <net/if.h>
  24
  25 #include "path-util.h"
  26 #include "conf-files.h"
  27 #include "conf-parser.h"
  28 #include "util.h"
  29 #include "networkd.h"
  30 #include "networkd-netdev.h"
  31 #include "networkd-link.h"
  32 #include "network-internal.h"
  33
  34 static int network_load_one(Manager *manager, const char *filename) {
  35         _cleanup_network_free_ Network *network = NULL;
  36         _cleanup_fclose_ FILE *file = NULL;
  37         char *d;
  38         Route *route;
  39         Address *address;
  40         int r;
  41
  42         assert(manager);
  43         assert(filename);
  44
  45         file = fopen(filename, "re");
  46         if (!file) {
  47                 if (errno == ENOENT)
  48                         return 0;
  49                 else
  50                         return -errno;
  51         }
  52
  53         if (null_or_empty_fd(fileno(file))) {
  54                 log_debug("Skipping empty file: %s", filename);
  55                 return 0;
  56         }
  57
  58         network = new0(Network, 1);
  59         if (!network)
  60                 return log_oom();
  61
  62         network->manager = manager;
  63
  64         LIST_HEAD_INIT(network->static_addresses);
  65         LIST_HEAD_INIT(network->static_routes);
  66         LIST_HEAD_INIT(network->static_fdb_entries);
  67
  68         network->stacked_netdevs = hashmap_new(&string_hash_ops);
  69         if (!network->stacked_netdevs)
  70                 return log_oom();
  71
  72         network->addresses_by_section = hashmap_new(NULL);
  73         if (!network->addresses_by_section)
  74                 return log_oom();
  75
  76         network->routes_by_section = hashmap_new(NULL);
  77         if (!network->routes_by_section)
  78                 return log_oom();
  79
  80         network->fdb_entries_by_section = hashmap_new(NULL);
  81         if (!network->fdb_entries_by_section)
  82                 return log_oom();
  83
  84         network->filename = strdup(filename);
  85         if (!network->filename)
  86                 return log_oom();
  87
  88         network->name = strdup(basename(filename));
  89         if (!network->name)
  90                 return log_oom();
  91
  92         d = strrchr(network->name, '.');
  93         if (!d)
  94                 return -EINVAL;
  95
  96         assert(streq(d, ".network"));
  97
  98         *d = '\0';
  99
 100         network->dhcp = ADDRESS_FAMILY_NO;
 101         network->dhcp_ntp = true;
 102         network->dhcp_dns = true;
 103         network->dhcp_hostname = true;
 104         network->dhcp_routes = true;
 105         network->dhcp_sendhost = true;
 106         network->dhcp_route_metric = DHCP_ROUTE_METRIC;
 107
 108         network->llmnr = LLMNR_SUPPORT_YES;
 109
 110         network->link_local = ADDRESS_FAMILY_IPV6;
 111
 112         r = config_parse(NULL, filename, file,
 113                          "Match\0"
 114                          "Link\0"
 115                          "Network\0"
 116                          "Address\0"
 117                          "Route\0"
 118                          "DHCP\0"
 119                          "DHCPv4\0"
 120                          "Bridge\0"
 121                          "BridgeFDB\0",
 122                          config_item_perf_lookup, network_network_gperf_lookup,
 123                          false, false, true, network);
 124         if (r < 0)
 125                 return r;
 126
 127         /* IPMasquerade=yes implies IPForward=yes */
 128         if (network->ip_masquerade)
 129                 network->ip_forward |= ADDRESS_FAMILY_IPV4;
 130
 131         LIST_PREPEND(networks, manager->networks, network);
 132
 133         r = hashmap_ensure_allocated(&manager->networks_by_name, &string_hash_ops);
 134         if (r < 0)
 135                 return r;
 136
 137         r = hashmap_put(manager->networks_by_name, network->name, network);
 138         if (r < 0)
 139                 return r;
 140
 141         LIST_FOREACH(routes, route, network->static_routes) {
 142                 if (!route->family) {
 143                         log_warning("Route section without Gateway field configured in %s. "
 144                                     "Ignoring", filename);
 145                         return 0;
 146                 }
 147         }
 148
 149         LIST_FOREACH(addresses, address, network->static_addresses) {
 150                 if (!address->family) {
 151                         log_warning("Address section without Address field configured in %s. "
 152                                     "Ignoring", filename);
 153                         return 0;
 154                 }
 155         }
 156
 157         network = NULL;
 158
 159         return 0;
 160 }
 161
 162 int network_load(Manager *manager) {
 163         Network *network;
 164         _cleanup_strv_free_ char **files = NULL;
 165         char **f;
 166         int r;
 167
 168         assert(manager);
 169
 170         while ((network = manager->networks))
 171                 network_free(network);
 172
 173         r = conf_files_list_strv(&files, ".network", NULL, network_dirs);
 174         if (r < 0)
 175                 return log_error_errno(r, "Failed to enumerate network files: %m");
 176
 177         STRV_FOREACH_BACKWARDS(f, files) {
 178                 r = network_load_one(manager, *f);
 179                 if (r < 0)
 180                         return r;
 181         }
 182
 183         return 0;
 184 }
 185
 186 void network_free(Network *network) {
 187         NetDev *netdev;
 188         Route *route;
 189         Address *address;
 190         FdbEntry *fdb_entry;
 191         Iterator i;
 192
 193         if (!network)
 194                 return;
 195
 196         free(network->filename);
 197
 198         free(network->match_mac);
 199         free(network->match_path);
 200         free(network->match_driver);
 201         free(network->match_type);
 202         free(network->match_name);
 203
 204         free(network->description);
 205         free(network->dhcp_vendor_class_identifier);
 206
 207         free(network->mac);
 208
 209         strv_free(network->ntp);
 210         strv_free(network->dns);
 211         strv_free(network->domains);
 212
 213         netdev_unref(network->bridge);
 214
 215         netdev_unref(network->bond);
 216
 217         HASHMAP_FOREACH(netdev, network->stacked_netdevs, i) {
 218                 hashmap_remove(network->stacked_netdevs, netdev->ifname);
 219                 netdev_unref(netdev);
 220         }
 221         hashmap_free(network->stacked_netdevs);
 222
 223         while ((route = network->static_routes))
 224                 route_free(route);
 225
 226         while ((address = network->static_addresses))
 227                 address_free(address);
 228
 229         while ((fdb_entry = network->static_fdb_entries))
 230                 fdb_entry_free(fdb_entry);
 231
 232         hashmap_free(network->addresses_by_section);
 233         hashmap_free(network->routes_by_section);
 234         hashmap_free(network->fdb_entries_by_section);
 235
 236         if (network->manager) {
 237                 if (network->manager->networks)
 238                         LIST_REMOVE(networks, network->manager->networks, network);
 239
 240                 if (network->manager->networks_by_name)
 241                         hashmap_remove(network->manager->networks_by_name, network->name);
 242         }
 243
 244         free(network->name);
 245
 246         condition_free_list(network->match_host);
 247         condition_free_list(network->match_virt);
 248         condition_free_list(network->match_kernel);
 249         condition_free_list(network->match_arch);
 250
 251         free(network);
 252 }
 253
 254 int network_get_by_name(Manager *manager, const char *name, Network **ret) {
 255         Network *network;
 256
 257         assert(manager);
 258         assert(name);
 259         assert(ret);
 260
 261         network = hashmap_get(manager->networks_by_name, name);
 262         if (!network)
 263                 return -ENOENT;
 264
 265         *ret = network;
 266
 267         return 0;
 268 }
 269
 270 int network_get(Manager *manager, struct udev_device *device,
 271                 const char *ifname, const struct ether_addr *address,
 272                 Network **ret) {
 273         Network *network;
 274
 275         assert(manager);
 276         assert(ret);
 277
 278         LIST_FOREACH(networks, network, manager->networks) {
 279                 if (net_match_config(network->match_mac, network->match_path,
 280                                      network->match_driver, network->match_type,
 281                                      network->match_name, network->match_host,
 282                                      network->match_virt, network->match_kernel,
 283                                      network->match_arch,
 284                                      address,
 285                                      udev_device_get_property_value(device, "ID_PATH"),
 286                                      udev_device_get_driver(udev_device_get_parent(device)),
 287                                      udev_device_get_property_value(device, "ID_NET_DRIVER"),
 288                                      udev_device_get_devtype(device),
 289                                      ifname)) {
 290                         if (network->match_name) {
 291                                 const char *attr;
 292                                 uint8_t name_assign_type = NET_NAME_UNKNOWN;
 293
 294                                 attr = udev_device_get_sysattr_value(device, "name_assign_type");
 295                                 if (attr)
 296                                         (void)safe_atou8(attr, &name_assign_type);
 297
 298                                 if (name_assign_type == NET_NAME_ENUM)
 299                                         log_warning("%-*s: found matching network '%s', based on potentially unpredictable ifname",
 300                                                     IFNAMSIZ, ifname, network->filename);
 301                                 else
 302                                         log_debug("%-*s: found matching network '%s'", IFNAMSIZ, ifname, network->filename);
 303                         } else
 304                                 log_debug("%-*s: found matching network '%s'", IFNAMSIZ, ifname, network->filename);
 305
 306                         *ret = network;
 307                         return 0;
 308                 }
 309         }
 310
 311         *ret = NULL;
 312
 313         return -ENOENT;
 314 }
 315
 316 int network_apply(Manager *manager, Network *network, Link *link) {
 317         int r;
 318
 319         link->network = network;
 320
 321         if (network->ipv4ll_route) {
 322                 Route *route;
 323
 324                 r = route_new_static(network, 0, &route);
 325                 if (r < 0)
 326                         return r;
 327
 328                 r = inet_pton(AF_INET, "169.254.0.0", &route->dst_addr.in);
 329                 if (r == 0)
 330                         return -EINVAL;
 331                 if (r < 0)
 332                         return -errno;
 333
 334                 route->family = AF_INET;
 335                 route->dst_prefixlen = 16;
 336                 route->scope = RT_SCOPE_LINK;
 337                 route->metrics = IPV4LL_ROUTE_METRIC;
 338                 route->protocol = RTPROT_STATIC;
 339         }
 340
 341         if (network->dns || network->ntp) {
 342                 r = link_save(link);
 343                 if (r < 0)
 344                         return r;
 345         }
 346
 347         return 0;
 348 }
 349
 350 int config_parse_netdev(const char *unit,
 351                 const char *filename,
 352                 unsigned line,
 353                 const char *section,
 354                 unsigned section_line,
 355                 const char *lvalue,
 356                 int ltype,
 357                 const char *rvalue,
 358                 void *data,
 359                 void *userdata) {
 360         Network *network = userdata;
 361         _cleanup_free_ char *kind_string = NULL;
 362         char *p;
 363         NetDev *netdev;
 364         NetDevKind kind;
 365         int r;
 366
 367         assert(filename);
 368         assert(lvalue);
 369         assert(rvalue);
 370         assert(data);
 371
 372         kind_string = strdup(lvalue);
 373         if (!kind_string)
 374                 return log_oom();
 375
 376         /* the keys are CamelCase versions of the kind */
 377         for (p = kind_string; *p; p++)
 378                 *p = tolower(*p);
 379
 380         kind = netdev_kind_from_string(kind_string);
 381         if (kind == _NETDEV_KIND_INVALID) {
 382                 log_syntax(unit, LOG_ERR, filename, line, EINVAL,
 383                            "Invalid NetDev kind: %s", lvalue);
 384                 return 0;
 385         }
 386
 387         r = netdev_get(network->manager, rvalue, &netdev);
 388         if (r < 0) {
 389                 log_syntax(unit, LOG_ERR, filename, line, EINVAL,
 390                            "%s could not be found, ignoring assignment: %s", lvalue, rvalue);
 391                 return 0;
 392         }
 393
 394         if (netdev->kind != kind) {
 395                 log_syntax(unit, LOG_ERR, filename, line, EINVAL,
 396                            "NetDev is not a %s, ignoring assignment: %s", lvalue, rvalue);
 397                 return 0;
 398         }
 399
 400         switch (kind) {
 401         case NETDEV_KIND_BRIDGE:
 402                 network->bridge = netdev;
 403
 404                 break;
 405         case NETDEV_KIND_BOND:
 406                 network->bond = netdev;
 407
 408                 break;
 409         case NETDEV_KIND_VLAN:
 410         case NETDEV_KIND_MACVLAN:
 411         case NETDEV_KIND_IPVLAN:
 412         case NETDEV_KIND_VXLAN:
 413                 r = hashmap_put(network->stacked_netdevs, netdev->ifname, netdev);
 414                 if (r < 0) {
 415                         log_syntax(unit, LOG_ERR, filename, line, EINVAL,
 416                                    "Can not add VLAN '%s' to network: %s",
 417                                    rvalue, strerror(-r));
 418                         return 0;
 419                 }
 420
 421                 break;
 422         default:
 423                 assert_not_reached("Can not parse NetDev");
 424         }
 425
 426         netdev_ref(netdev);
 427
 428         return 0;
 429 }
 430
 431 int config_parse_domains(const char *unit,
 432                          const char *filename,
 433                          unsigned line,
 434                          const char *section,
 435                          unsigned section_line,
 436                          const char *lvalue,
 437                          int ltype,
 438                          const char *rvalue,
 439                          void *data,
 440                          void *userdata) {
 441         Network *network = userdata;
 442         char ***domains = data;
 443         char **domain;
 444         int r;
 445
 446         r = config_parse_strv(unit, filename, line, section, section_line,
 447                               lvalue, ltype, rvalue, domains, userdata);
 448         if (r < 0)
 449                 return r;
 450
 451         strv_uniq(*domains);
 452         network->wildcard_domain = !!strv_find(*domains, "*");
 453
 454         STRV_FOREACH(domain, *domains) {
 455                 if (is_localhost(*domain))
 456                         log_syntax(unit, LOG_ERR, filename, line, EINVAL, "'localhost' domain names may not be configured, ignoring assignment: %s", *domain);
 457                 else if (!hostname_is_valid(*domain)) {
 458                         if (!streq(*domain, "*"))
 459                                 log_syntax(unit, LOG_ERR, filename, line, EINVAL, "domain name is not valid, ignoring assignment: %s", *domain);
 460                 } else
 461                         continue;
 462
 463                 strv_remove(*domains, *domain);
 464
 465                 /* We removed one entry, make sure we don't skip the next one */
 466                 domain--;
 467         }
 468
 469         return 0;
 470 }
 471
 472 int config_parse_tunnel(const char *unit,
 473                         const char *filename,
 474                         unsigned line,
 475                         const char *section,
 476                         unsigned section_line,
 477                         const char *lvalue,
 478                         int ltype,
 479                         const char *rvalue,
 480                         void *data,
 481                         void *userdata) {
 482         Network *network = userdata;
 483         NetDev *netdev;
 484         int r;
 485
 486         assert(filename);
 487         assert(lvalue);
 488         assert(rvalue);
 489         assert(data);
 490
 491         r = netdev_get(network->manager, rvalue, &netdev);
 492         if (r < 0) {
 493                 log_syntax(unit, LOG_ERR, filename, line, EINVAL,
 494                            "Tunnel is invalid, ignoring assignment: %s", rvalue);
 495                 return 0;
 496         }
 497
 498         if (netdev->kind != NETDEV_KIND_IPIP &&
 499             netdev->kind != NETDEV_KIND_SIT &&
 500             netdev->kind != NETDEV_KIND_GRE &&
 501             netdev->kind != NETDEV_KIND_GRETAP &&
 502             netdev->kind != NETDEV_KIND_IP6GRE &&
 503             netdev->kind != NETDEV_KIND_IP6GRETAP &&
 504             netdev->kind != NETDEV_KIND_VTI &&
 505             netdev->kind != NETDEV_KIND_IP6TNL
 506             ) {
 507                 log_syntax(unit, LOG_ERR, filename, line, EINVAL,
 508                            "NetDev is not a tunnel, ignoring assignment: %s", rvalue);
 509                 return 0;
 510         }
 511
 512         r = hashmap_put(network->stacked_netdevs, netdev->ifname, netdev);
 513         if (r < 0) {
 514                 log_syntax(unit, LOG_ERR, filename, line, EINVAL,
 515                            "Can not add VLAN '%s' to network: %s",
 516                            rvalue, strerror(-r));
 517                 return 0;
 518         }
 519
 520         netdev_ref(netdev);
 521
 522         return 0;
 523 }
 524
 525 int config_parse_ipv4ll(
 526                 const char* unit,
 527                 const char *filename,
 528                 unsigned line,
 529                 const char *section,
 530                 unsigned section_line,
 531                 const char *lvalue,
 532                 int ltype,
 533                 const char *rvalue,
 534                 void *data,
 535                 void *userdata) {
 536
 537         AddressFamilyBoolean *link_local = data;
 538
 539         assert(filename);
 540         assert(lvalue);
 541         assert(rvalue);
 542         assert(data);
 543
 544         /* Note that this is mostly like
 545          * config_parse_address_family_boolean(), except that it
 546          * applies only to IPv4 */
 547
 548         if (parse_boolean(rvalue))
 549                 *link_local |= ADDRESS_FAMILY_IPV4;
 550         else
 551                 *link_local &= ~ADDRESS_FAMILY_IPV4;
 552
 553         return 0;
 554 }
 555
 556 int config_parse_dhcp(
 557                 const char* unit,
 558                 const char *filename,
 559                 unsigned line,
 560                 const char *section,
 561                 unsigned section_line,
 562                 const char *lvalue,
 563                 int ltype,
 564                 const char *rvalue,
 565                 void *data,
 566                 void *userdata) {
 567
 568         AddressFamilyBoolean *dhcp = data, s;
 569
 570         assert(filename);
 571         assert(lvalue);
 572         assert(rvalue);
 573         assert(data);
 574
 575         /* Note that this is mostly like
 576          * config_parse_address_family_boolean(), except that it
 577          * understands some old names for the enum values */
 578
 579         s = address_family_boolean_from_string(rvalue);
 580         if (s < 0) {
 581
 582                 /* Previously, we had a slightly different enum here,
 583                  * support its values for compatbility. */
 584
 585                 if (streq(rvalue, "none"))
 586                         s = ADDRESS_FAMILY_NO;
 587                 else if (streq(rvalue, "v4"))
 588                         s = ADDRESS_FAMILY_IPV4;
 589                 else if (streq(rvalue, "v6"))
 590                         s = ADDRESS_FAMILY_IPV6;
 591                 else if (streq(rvalue, "both"))
 592                         s = ADDRESS_FAMILY_YES;
 593                 else {
 594                         log_syntax(unit, LOG_ERR, filename, line, s, "Failed to parse DHCP option, ignoring: %s", rvalue);
 595                         return 0;
 596                 }
 597         }
 598
 599         *dhcp = s;
 600         return 0;
 601 }
 602
 603 static const char* const llmnr_support_table[_LLMNR_SUPPORT_MAX] = {
 604         [LLMNR_SUPPORT_NO] = "no",
 605         [LLMNR_SUPPORT_YES] = "yes",
 606         [LLMNR_SUPPORT_RESOLVE] = "resolve",
 607 };
 608
 609 DEFINE_STRING_TABLE_LOOKUP(llmnr_support, LLMNRSupport);
 610
 611 int config_parse_llmnr(
 612                 const char* unit,
 613                 const char *filename,
 614                 unsigned line,
 615                 const char *section,
 616                 unsigned section_line,
 617                 const char *lvalue,
 618                 int ltype,
 619                 const char *rvalue,
 620                 void *data,
 621                 void *userdata) {
 622
 623         LLMNRSupport *llmnr = data;
 624         int k;
 625
 626         assert(filename);
 627         assert(lvalue);
 628         assert(rvalue);
 629         assert(data);
 630
 631         /* Our enum shall be a superset of booleans, hence first try
 632          * to parse as boolean, and then as enum */
 633
 634         k = parse_boolean(rvalue);
 635         if (k > 0)
 636                 *llmnr = LLMNR_SUPPORT_YES;
 637         else if (k == 0)
 638                 *llmnr = LLMNR_SUPPORT_NO;
 639         else {
 640                 LLMNRSupport s;
 641
 642                 s = llmnr_support_from_string(rvalue);
 643                 if (s < 0){
 644                         log_syntax(unit, LOG_ERR, filename, line, -s, "Failed to parse LLMNR option, ignoring: %s", rvalue);
 645                         return 0;
 646                 }
 647
 648                 *llmnr = s;
 649         }
 650
 651         return 0;
 652 }