src/network/networkd-manager.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2013 Tom Gundersen <teg@jklm.no>
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18  ***/
  19
  20 #include <sys/socket.h>
  21 #include <linux/if.h>
  22
  23 #include "sd-daemon.h"
  24 #include "sd-netlink.h"
  25
  26 #include "alloc-util.h"
  27 #include "bus-util.h"
  28 #include "conf-parser.h"
  29 #include "def.h"
  30 #include "dns-domain.h"
  31 #include "fd-util.h"
  32 #include "fileio.h"
  33 #include "libudev-private.h"
  34 #include "local-addresses.h"
  35 #include "netlink-util.h"
  36 #include "networkd.h"
  37 #include "ordered-set.h"
  38 #include "path-util.h"
  39 #include "set.h"
  40 #include "udev-util.h"
  41 #include "virt.h"
  42
  43 /* use 8 MB for receive socket kernel queue. */
  44 #define RCVBUF_SIZE    (8*1024*1024)
  45
  46 const char* const network_dirs[] = {
  47         "/etc/systemd/network",
  48         "/run/systemd/network",
  49         "/usr/lib/systemd/network",
  50 #ifdef HAVE_SPLIT_USR
  51         "/lib/systemd/network",
  52 #endif
  53         NULL};
  54
  55 static int setup_default_address_pool(Manager *m) {
  56         AddressPool *p;
  57         int r;
  58
  59         assert(m);
  60
  61         /* Add in the well-known private address ranges. */
  62
  63         r = address_pool_new_from_string(m, &p, AF_INET6, "fc00::", 7);
  64         if (r < 0)
  65                 return r;
  66
  67         r = address_pool_new_from_string(m, &p, AF_INET, "192.168.0.0", 16);
  68         if (r < 0)
  69                 return r;
  70
  71         r = address_pool_new_from_string(m, &p, AF_INET, "172.16.0.0", 12);
  72         if (r < 0)
  73                 return r;
  74
  75         r = address_pool_new_from_string(m, &p, AF_INET, "10.0.0.0", 8);
  76         if (r < 0)
  77                 return r;
  78
  79         return 0;
  80 }
  81
  82 static int on_bus_retry(sd_event_source *s, usec_t usec, void *userdata) {
  83         Manager *m = userdata;
  84
  85         assert(s);
  86         assert(m);
  87
  88         m->bus_retry_event_source = sd_event_source_unref(m->bus_retry_event_source);
  89
  90         manager_connect_bus(m);
  91
  92         return 0;
  93 }
  94
  95 static int manager_reset_all(Manager *m) {
  96         Link *link;
  97         Iterator i;
  98         int r;
  99
 100         assert(m);
 101
 102         HASHMAP_FOREACH(link, m->links, i) {
 103                 r = link_carrier_reset(link);
 104                 if (r < 0)
 105                         log_link_warning_errno(link, r, "Could not reset carrier: %m");
 106         }
 107
 108         return 0;
 109 }
 110
 111 static int match_prepare_for_sleep(sd_bus_message *message, void *userdata, sd_bus_error *ret_error) {
 112         Manager *m = userdata;
 113         int b, r;
 114
 115         assert(message);
 116
 117         r = sd_bus_message_read(message, "b", &b);
 118         if (r < 0) {
 119                 log_debug_errno(r, "Failed to parse PrepareForSleep signal: %m");
 120                 return 0;
 121         }
 122
 123         if (b)
 124                 return 0;
 125
 126         log_debug("Coming back from suspend, resetting all connections...");
 127
 128         manager_reset_all(m);
 129
 130         return 0;
 131 }
 132
 133 int manager_connect_bus(Manager *m) {
 134         int r;
 135
 136         assert(m);
 137
 138         r = sd_bus_default_system(&m->bus);
 139         if (r == -ENOENT) {
 140                 /* We failed to connect? Yuck, we must be in early
 141                  * boot. Let's try in 5s again. As soon as we have
 142                  * kdbus we can stop doing this... */
 143
 144                 log_debug_errno(r, "Failed to connect to bus, trying again in 5s: %m");
 145
 146                 r = sd_event_add_time(m->event, &m->bus_retry_event_source, CLOCK_MONOTONIC, now(CLOCK_MONOTONIC) + 5*USEC_PER_SEC, 0, on_bus_retry, m);
 147                 if (r < 0)
 148                         return log_error_errno(r, "Failed to install bus reconnect time event: %m");
 149
 150                 return 0;
 151         }
 152
 153         if (r < 0)
 154                 return r;
 155
 156         r = sd_bus_add_match(m->bus, &m->prepare_for_sleep_slot,
 157                              "type='signal',"
 158                              "sender='org.freedesktop.login1',"
 159                              "interface='org.freedesktop.login1.Manager',"
 160                              "member='PrepareForSleep',"
 161                              "path='/org/freedesktop/login1'",
 162                              match_prepare_for_sleep,
 163                              m);
 164         if (r < 0)
 165                 return log_error_errno(r, "Failed to add match for PrepareForSleep: %m");
 166
 167         r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/network1", "org.freedesktop.network1.Manager", manager_vtable, m);
 168         if (r < 0)
 169                 return log_error_errno(r, "Failed to add manager object vtable: %m");
 170
 171         r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/network1/link", "org.freedesktop.network1.Link", link_vtable, link_object_find, m);
 172         if (r < 0)
 173                return log_error_errno(r, "Failed to add link object vtable: %m");
 174
 175         r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/network1/link", link_node_enumerator, m);
 176         if (r < 0)
 177                 return log_error_errno(r, "Failed to add link enumerator: %m");
 178
 179         r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/network1/link", "org.freedesktop.network1.Link.Lease", lease_vtable, lease_object_find, m);
 180         if (r < 0)
 181                return log_error_errno(r, "Failed to add lease object vtable: %m");
 182
 183         r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/network1/link", lease_node_enumerator, m);
 184         if (r < 0)
 185                 return log_error_errno(r, "Failed to add lease enumerator: %m");
 186
 187         r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/network1/network", "org.freedesktop.network1.Network", network_vtable, network_object_find, m);
 188         if (r < 0)
 189                return log_error_errno(r, "Failed to add network object vtable: %m");
 190
 191         r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/network1/network", network_node_enumerator, m);
 192         if (r < 0)
 193                 return log_error_errno(r, "Failed to add network enumerator: %m");
 194
 195         r = sd_bus_request_name(m->bus, "org.freedesktop.network1", 0);
 196         if (r < 0)
 197                 return log_error_errno(r, "Failed to register name: %m");
 198
 199         r = sd_bus_attach_event(m->bus, m->event, 0);
 200         if (r < 0)
 201                 return log_error_errno(r, "Failed to attach bus to event loop: %m");
 202
 203         return 0;
 204 }
 205
 206 static int manager_udev_process_link(Manager *m, struct udev_device *device) {
 207         Link *link = NULL;
 208         int r, ifindex;
 209
 210         assert(m);
 211         assert(device);
 212
 213         if (!streq_ptr(udev_device_get_action(device), "add"))
 214                 return 0;
 215
 216         ifindex = udev_device_get_ifindex(device);
 217         if (ifindex <= 0) {
 218                 log_debug("Ignoring udev ADD event for device with invalid ifindex");
 219                 return 0;
 220         }
 221
 222         r = link_get(m, ifindex, &link);
 223         if (r == -ENODEV)
 224                 return 0;
 225         else if (r < 0)
 226                 return r;
 227
 228         r = link_initialized(link, device);
 229         if (r < 0)
 230                 return r;
 231
 232         return 0;
 233 }
 234
 235 static int manager_dispatch_link_udev(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
 236         Manager *m = userdata;
 237         struct udev_monitor *monitor = m->udev_monitor;
 238         _cleanup_udev_device_unref_ struct udev_device *device = NULL;
 239
 240         device = udev_monitor_receive_device(monitor);
 241         if (!device)
 242                 return -ENOMEM;
 243
 244         manager_udev_process_link(m, device);
 245         return 0;
 246 }
 247
 248 static int manager_connect_udev(Manager *m) {
 249         int r;
 250
 251         /* udev does not initialize devices inside containers,
 252          * so we rely on them being already initialized before
 253          * entering the container */
 254         if (detect_container() > 0)
 255                 return 0;
 256
 257         m->udev = udev_new();
 258         if (!m->udev)
 259                 return -ENOMEM;
 260
 261         m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
 262         if (!m->udev_monitor)
 263                 return -ENOMEM;
 264
 265         r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "net", NULL);
 266         if (r < 0)
 267                 return log_error_errno(r, "Could not add udev monitor filter: %m");
 268
 269         r = udev_monitor_enable_receiving(m->udev_monitor);
 270         if (r < 0) {
 271                 log_error("Could not enable udev monitor");
 272                 return r;
 273         }
 274
 275         r = sd_event_add_io(m->event,
 276                         &m->udev_event_source,
 277                         udev_monitor_get_fd(m->udev_monitor),
 278                         EPOLLIN, manager_dispatch_link_udev,
 279                         m);
 280         if (r < 0)
 281                 return r;
 282
 283         r = sd_event_source_set_description(m->udev_event_source, "networkd-udev");
 284         if (r < 0)
 285                 return r;
 286
 287         return 0;
 288 }
 289
 290 int manager_rtnl_process_route(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) {
 291         Manager *m = userdata;
 292         Link *link = NULL;
 293         uint16_t type;
 294         uint32_t ifindex, priority = 0;
 295         unsigned char protocol, scope, tos, table;
 296         int family;
 297         unsigned char dst_prefixlen, src_prefixlen;
 298         union in_addr_union dst = {}, gw = {}, src = {}, prefsrc = {};
 299         Route *route = NULL;
 300         int r;
 301
 302         assert(rtnl);
 303         assert(message);
 304         assert(m);
 305
 306         if (sd_netlink_message_is_error(message)) {
 307                 r = sd_netlink_message_get_errno(message);
 308                 if (r < 0)
 309                         log_warning_errno(r, "rtnl: failed to receive route: %m");
 310
 311                 return 0;
 312         }
 313
 314         r = sd_netlink_message_get_type(message, &type);
 315         if (r < 0) {
 316                 log_warning_errno(r, "rtnl: could not get message type: %m");
 317                 return 0;
 318         } else if (type != RTM_NEWROUTE && type != RTM_DELROUTE) {
 319                 log_warning("rtnl: received unexpected message type when processing route");
 320                 return 0;
 321         }
 322
 323         r = sd_netlink_message_read_u32(message, RTA_OIF, &ifindex);
 324         if (r == -ENODATA) {
 325                 log_debug("rtnl: received route without ifindex, ignoring");
 326                 return 0;
 327         } else if (r < 0) {
 328                 log_warning_errno(r, "rtnl: could not get ifindex from route, ignoring: %m");
 329                 return 0;
 330         } else if (ifindex <= 0) {
 331                 log_warning("rtnl: received route message with invalid ifindex, ignoring: %d", ifindex);
 332                 return 0;
 333         } else {
 334                 r = link_get(m, ifindex, &link);
 335                 if (r < 0 || !link) {
 336                         /* when enumerating we might be out of sync, but we will
 337                          * get the route again, so just ignore it */
 338                         if (!m->enumerating)
 339                                 log_warning("rtnl: received route for nonexistent link (%d), ignoring", ifindex);
 340                         return 0;
 341                 }
 342         }
 343
 344         r = sd_rtnl_message_route_get_family(message, &family);
 345         if (r < 0 || !IN_SET(family, AF_INET, AF_INET6)) {
 346                 log_link_warning(link, "rtnl: received address with invalid family, ignoring.");
 347                 return 0;
 348         }
 349
 350         r = sd_rtnl_message_route_get_protocol(message, &protocol);
 351         if (r < 0) {
 352                 log_warning_errno(r, "rtnl: could not get route protocol: %m");
 353                 return 0;
 354         }
 355
 356         switch (family) {
 357         case AF_INET:
 358                 r = sd_netlink_message_read_in_addr(message, RTA_DST, &dst.in);
 359                 if (r < 0 && r != -ENODATA) {
 360                         log_link_warning_errno(link, r, "rtnl: received route without valid destination, ignoring: %m");
 361                         return 0;
 362                 }
 363
 364                 r = sd_netlink_message_read_in_addr(message, RTA_GATEWAY, &gw.in);
 365                 if (r < 0 && r != -ENODATA) {
 366                         log_link_warning_errno(link, r, "rtnl: received route with invalid gateway, ignoring: %m");
 367                         return 0;
 368                 }
 369
 370                 r = sd_netlink_message_read_in_addr(message, RTA_SRC, &src.in);
 371                 if (r < 0 && r != -ENODATA) {
 372                         log_link_warning_errno(link, r, "rtnl: received route with invalid source, ignoring: %m");
 373                         return 0;
 374                 }
 375
 376                 r = sd_netlink_message_read_in_addr(message, RTA_PREFSRC, &prefsrc.in);
 377                 if (r < 0 && r != -ENODATA) {
 378                         log_link_warning_errno(link, r, "rtnl: received route with invalid preferred source, ignoring: %m");
 379                         return 0;
 380                 }
 381
 382                 break;
 383
 384         case AF_INET6:
 385                 r = sd_netlink_message_read_in6_addr(message, RTA_DST, &dst.in6);
 386                 if (r < 0 && r != -ENODATA) {
 387                         log_link_warning_errno(link, r, "rtnl: received route without valid destination, ignoring: %m");
 388                         return 0;
 389                 }
 390
 391                 r = sd_netlink_message_read_in6_addr(message, RTA_GATEWAY, &gw.in6);
 392                 if (r < 0 && r != -ENODATA) {
 393                         log_link_warning_errno(link, r, "rtnl: received route with invalid gateway, ignoring: %m");
 394                         return 0;
 395                 }
 396
 397                 r = sd_netlink_message_read_in6_addr(message, RTA_SRC, &src.in6);
 398                 if (r < 0 && r != -ENODATA) {
 399                         log_link_warning_errno(link, r, "rtnl: received route with invalid source, ignoring: %m");
 400                         return 0;
 401                 }
 402
 403                 r = sd_netlink_message_read_in6_addr(message, RTA_PREFSRC, &prefsrc.in6);
 404                 if (r < 0 && r != -ENODATA) {
 405                         log_link_warning_errno(link, r, "rtnl: received route with invalid preferred source, ignoring: %m");
 406                         return 0;
 407                 }
 408
 409                 break;
 410
 411         default:
 412                 log_link_debug(link, "rtnl: ignoring unsupported address family: %d", family);
 413                 return 0;
 414         }
 415
 416         r = sd_rtnl_message_route_get_dst_prefixlen(message, &dst_prefixlen);
 417         if (r < 0) {
 418                 log_link_warning_errno(link, r, "rtnl: received route with invalid destination prefixlen, ignoring: %m");
 419                 return 0;
 420         }
 421
 422         r = sd_rtnl_message_route_get_src_prefixlen(message, &src_prefixlen);
 423         if (r < 0) {
 424                 log_link_warning_errno(link, r, "rtnl: received route with invalid source prefixlen, ignoring: %m");
 425                 return 0;
 426         }
 427
 428         r = sd_rtnl_message_route_get_scope(message, &scope);
 429         if (r < 0) {
 430                 log_link_warning_errno(link, r, "rtnl: received route with invalid scope, ignoring: %m");
 431                 return 0;
 432         }
 433
 434         r = sd_rtnl_message_route_get_tos(message, &tos);
 435         if (r < 0) {
 436                 log_link_warning_errno(link, r, "rtnl: received route with invalid tos, ignoring: %m");
 437                 return 0;
 438         }
 439
 440         r = sd_rtnl_message_route_get_table(message, &table);
 441         if (r < 0) {
 442                 log_link_warning_errno(link, r, "rtnl: received route with invalid table, ignoring: %m");
 443                 return 0;
 444         }
 445
 446         r = sd_netlink_message_read_u32(message, RTA_PRIORITY, &priority);
 447         if (r < 0 && r != -ENODATA) {
 448                 log_link_warning_errno(link, r, "rtnl: received route with invalid priority, ignoring: %m");
 449                 return 0;
 450         }
 451
 452         route_get(link, family, &dst, dst_prefixlen, tos, priority, table, &route);
 453
 454         switch (type) {
 455         case RTM_NEWROUTE:
 456                 if (!route) {
 457                         /* A route appeared that we did not request */
 458                         r = route_add_foreign(link, family, &dst, dst_prefixlen, tos, priority, table, &route);
 459                         if (r < 0)
 460                                 return 0;
 461                 }
 462
 463                 route_update(route, &src, src_prefixlen, &gw, &prefsrc, scope, protocol);
 464
 465                 break;
 466
 467         case RTM_DELROUTE:
 468                 route_free(route);
 469                 break;
 470
 471         default:
 472                 assert_not_reached("Received invalid RTNL message type");
 473         }
 474
 475         return 1;
 476 }
 477
 478 int manager_rtnl_process_address(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) {
 479         Manager *m = userdata;
 480         Link *link = NULL;
 481         uint16_t type;
 482         unsigned char flags;
 483         int family;
 484         unsigned char prefixlen;
 485         unsigned char scope;
 486         union in_addr_union in_addr;
 487         struct ifa_cacheinfo cinfo;
 488         Address *address = NULL;
 489         char buf[INET6_ADDRSTRLEN], valid_buf[FORMAT_TIMESPAN_MAX];
 490         const char *valid_str = NULL;
 491         int r, ifindex;
 492
 493         assert(rtnl);
 494         assert(message);
 495         assert(m);
 496
 497         if (sd_netlink_message_is_error(message)) {
 498                 r = sd_netlink_message_get_errno(message);
 499                 if (r < 0)
 500                         log_warning_errno(r, "rtnl: failed to receive address: %m");
 501
 502                 return 0;
 503         }
 504
 505         r = sd_netlink_message_get_type(message, &type);
 506         if (r < 0) {
 507                 log_warning_errno(r, "rtnl: could not get message type: %m");
 508                 return 0;
 509         } else if (type != RTM_NEWADDR && type != RTM_DELADDR) {
 510                 log_warning("rtnl: received unexpected message type when processing address");
 511                 return 0;
 512         }
 513
 514         r = sd_rtnl_message_addr_get_ifindex(message, &ifindex);
 515         if (r < 0) {
 516                 log_warning_errno(r, "rtnl: could not get ifindex from address: %m");
 517                 return 0;
 518         } else if (ifindex <= 0) {
 519                 log_warning("rtnl: received address message with invalid ifindex: %d", ifindex);
 520                 return 0;
 521         } else {
 522                 r = link_get(m, ifindex, &link);
 523                 if (r < 0 || !link) {
 524                         /* when enumerating we might be out of sync, but we will
 525                          * get the address again, so just ignore it */
 526                         if (!m->enumerating)
 527                                 log_warning("rtnl: received address for nonexistent link (%d), ignoring", ifindex);
 528                         return 0;
 529                 }
 530         }
 531
 532         r = sd_rtnl_message_addr_get_family(message, &family);
 533         if (r < 0 || !IN_SET(family, AF_INET, AF_INET6)) {
 534                 log_link_warning(link, "rtnl: received address with invalid family, ignoring.");
 535                 return 0;
 536         }
 537
 538         r = sd_rtnl_message_addr_get_prefixlen(message, &prefixlen);
 539         if (r < 0) {
 540                 log_link_warning_errno(link, r, "rtnl: received address with invalid prefixlen, ignoring: %m");
 541                 return 0;
 542         }
 543
 544         r = sd_rtnl_message_addr_get_scope(message, &scope);
 545         if (r < 0) {
 546                 log_link_warning_errno(link, r, "rtnl: received address with invalid scope, ignoring: %m");
 547                 return 0;
 548         }
 549
 550         r = sd_rtnl_message_addr_get_flags(message, &flags);
 551         if (r < 0) {
 552                 log_link_warning_errno(link, r, "rtnl: received address with invalid flags, ignoring: %m");
 553                 return 0;
 554         }
 555
 556         switch (family) {
 557         case AF_INET:
 558                 r = sd_netlink_message_read_in_addr(message, IFA_LOCAL, &in_addr.in);
 559                 if (r < 0) {
 560                         log_link_warning_errno(link, r, "rtnl: received address without valid address, ignoring: %m");
 561                         return 0;
 562                 }
 563
 564                 break;
 565
 566         case AF_INET6:
 567                 r = sd_netlink_message_read_in6_addr(message, IFA_ADDRESS, &in_addr.in6);
 568                 if (r < 0) {
 569                         log_link_warning_errno(link, r, "rtnl: received address without valid address, ignoring: %m");
 570                         return 0;
 571                 }
 572
 573                 break;
 574
 575         default:
 576                 log_link_debug(link, "rtnl: ignoring unsupported address family: %d", family);
 577         }
 578
 579         if (!inet_ntop(family, &in_addr, buf, INET6_ADDRSTRLEN)) {
 580                 log_link_warning(link, "Could not print address");
 581                 return 0;
 582         }
 583
 584         r = sd_netlink_message_read_cache_info(message, IFA_CACHEINFO, &cinfo);
 585         if (r >= 0) {
 586                 if (cinfo.ifa_valid != CACHE_INFO_INFINITY_LIFE_TIME)
 587                         valid_str = format_timespan(valid_buf, FORMAT_TIMESPAN_MAX,
 588                                                     cinfo.ifa_valid * USEC_PER_SEC,
 589                                                     USEC_PER_SEC);
 590         }
 591
 592         address_get(link, family, &in_addr, prefixlen, &address);
 593
 594         switch (type) {
 595         case RTM_NEWADDR:
 596                 if (address)
 597                         log_link_debug(link, "Updating address: %s/%u (valid %s%s)", buf, prefixlen,
 598                                        valid_str ? "for " : "forever", valid_str ?: "");
 599                 else {
 600                         /* An address appeared that we did not request */
 601                         r = address_add_foreign(link, family, &in_addr, prefixlen, &address);
 602                         if (r < 0) {
 603                                 log_link_warning_errno(link, r, "Failed to add address %s/%u: %m", buf, prefixlen);
 604                                 return 0;
 605                         } else
 606                                 log_link_debug(link, "Adding address: %s/%u (valid %s%s)", buf, prefixlen,
 607                                                valid_str ? "for " : "forever", valid_str ?: "");
 608                 }
 609
 610                 address_update(address, flags, scope, &cinfo);
 611
 612                 break;
 613
 614         case RTM_DELADDR:
 615
 616                 if (address) {
 617                         log_link_debug(link, "Removing address: %s/%u (valid %s%s)", buf, prefixlen,
 618                                        valid_str ? "for " : "forever", valid_str ?: "");
 619                         address_drop(address);
 620                 } else
 621                         log_link_warning(link, "Removing non-existent address: %s/%u (valid %s%s)", buf, prefixlen,
 622                                          valid_str ? "for " : "forever", valid_str ?: "");
 623
 624                 break;
 625         default:
 626                 assert_not_reached("Received invalid RTNL message type");
 627         }
 628
 629         return 1;
 630 }
 631
 632 static int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) {
 633         Manager *m = userdata;
 634         Link *link = NULL;
 635         NetDev *netdev = NULL;
 636         uint16_t type;
 637         const char *name;
 638         int r, ifindex;
 639
 640         assert(rtnl);
 641         assert(message);
 642         assert(m);
 643
 644         if (sd_netlink_message_is_error(message)) {
 645                 r = sd_netlink_message_get_errno(message);
 646                 if (r < 0)
 647                         log_warning_errno(r, "rtnl: Could not receive link: %m");
 648
 649                 return 0;
 650         }
 651
 652         r = sd_netlink_message_get_type(message, &type);
 653         if (r < 0) {
 654                 log_warning_errno(r, "rtnl: Could not get message type: %m");
 655                 return 0;
 656         } else if (type != RTM_NEWLINK && type != RTM_DELLINK) {
 657                 log_warning("rtnl: Received unexpected message type when processing link");
 658                 return 0;
 659         }
 660
 661         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 662         if (r < 0) {
 663                 log_warning_errno(r, "rtnl: Could not get ifindex from link: %m");
 664                 return 0;
 665         } else if (ifindex <= 0) {
 666                 log_warning("rtnl: received link message with invalid ifindex: %d", ifindex);
 667                 return 0;
 668         }
 669
 670         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
 671         if (r < 0) {
 672                 log_warning_errno(r, "rtnl: Received link message without ifname: %m");
 673                 return 0;
 674         }
 675
 676         (void) link_get(m, ifindex, &link);
 677         (void) netdev_get(m, name, &netdev);
 678
 679         switch (type) {
 680         case RTM_NEWLINK:
 681                 if (!link) {
 682                         /* link is new, so add it */
 683                         r = link_add(m, message, &link);
 684                         if (r < 0) {
 685                                 log_warning_errno(r, "Could not add new link: %m");
 686                                 return 0;
 687                         }
 688                 }
 689
 690                 if (netdev) {
 691                         /* netdev exists, so make sure the ifindex matches */
 692                         r = netdev_set_ifindex(netdev, message);
 693                         if (r < 0) {
 694                                 log_warning_errno(r, "Could not set ifindex on netdev: %m");
 695                                 return 0;
 696                         }
 697                 }
 698
 699                 r = link_update(link, message);
 700                 if (r < 0)
 701                         return 0;
 702
 703                 break;
 704
 705         case RTM_DELLINK:
 706                 link_drop(link);
 707                 netdev_drop(netdev);
 708
 709                 break;
 710
 711         default:
 712                 assert_not_reached("Received invalid RTNL message type.");
 713         }
 714
 715         return 1;
 716 }
 717
 718 static int systemd_netlink_fd(void) {
 719         int n, fd, rtnl_fd = -EINVAL;
 720
 721         n = sd_listen_fds(true);
 722         if (n <= 0)
 723                 return -EINVAL;
 724
 725         for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd ++) {
 726                 if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1) > 0) {
 727                         if (rtnl_fd >= 0)
 728                                 return -EINVAL;
 729
 730                         rtnl_fd = fd;
 731                 }
 732         }
 733
 734         return rtnl_fd;
 735 }
 736
 737 static int manager_connect_rtnl(Manager *m) {
 738         int fd, r;
 739
 740         assert(m);
 741
 742         fd = systemd_netlink_fd();
 743         if (fd < 0)
 744                 r = sd_netlink_open(&m->rtnl);
 745         else
 746                 r = sd_netlink_open_fd(&m->rtnl, fd);
 747         if (r < 0)
 748                 return r;
 749
 750         r = sd_netlink_inc_rcvbuf(m->rtnl, RCVBUF_SIZE);
 751         if (r < 0)
 752                 return r;
 753
 754         r = sd_netlink_attach_event(m->rtnl, m->event, 0);
 755         if (r < 0)
 756                 return r;
 757
 758         r = sd_netlink_add_match(m->rtnl, RTM_NEWLINK, &manager_rtnl_process_link, m);
 759         if (r < 0)
 760                 return r;
 761
 762         r = sd_netlink_add_match(m->rtnl, RTM_DELLINK, &manager_rtnl_process_link, m);
 763         if (r < 0)
 764                 return r;
 765
 766         r = sd_netlink_add_match(m->rtnl, RTM_NEWADDR, &manager_rtnl_process_address, m);
 767         if (r < 0)
 768                 return r;
 769
 770         r = sd_netlink_add_match(m->rtnl, RTM_DELADDR, &manager_rtnl_process_address, m);
 771         if (r < 0)
 772                 return r;
 773
 774         r = sd_netlink_add_match(m->rtnl, RTM_NEWROUTE, &manager_rtnl_process_route, m);
 775         if (r < 0)
 776                 return r;
 777
 778         r = sd_netlink_add_match(m->rtnl, RTM_DELROUTE, &manager_rtnl_process_route, m);
 779         if (r < 0)
 780                 return r;
 781
 782         return 0;
 783 }
 784
 785 static int ordered_set_put_in_addr(OrderedSet *s, const struct in_addr *address) {
 786         char *p;
 787         int r;
 788
 789         assert(s);
 790
 791         r = in_addr_to_string(AF_INET, (const union in_addr_union*) address, &p);
 792         if (r < 0)
 793                 return r;
 794
 795         r = ordered_set_consume(s, p);
 796         if (r == -EEXIST)
 797                 return 0;
 798
 799         return r;
 800 }
 801
 802 static int ordered_set_put_in_addrv(OrderedSet *s, const struct in_addr *addresses, int n) {
 803         int r, i, c = 0;
 804
 805         assert(s);
 806         assert(n <= 0 || addresses);
 807
 808         for (i = 0; i < n; i++) {
 809                 r = ordered_set_put_in_addr(s, addresses+i);
 810                 if (r < 0)
 811                         return r;
 812
 813                 c += r;
 814         }
 815
 816         return c;
 817 }
 818
 819 static void print_string_set(FILE *f, const char *field, OrderedSet *s) {
 820         bool space = false;
 821         Iterator i;
 822         char *p;
 823
 824         if (ordered_set_isempty(s))
 825                 return;
 826
 827         fputs(field, f);
 828
 829         ORDERED_SET_FOREACH(p, s, i)
 830                 fputs_with_space(f, p, NULL, &space);
 831
 832         fputc('\n', f);
 833 }
 834
 835 static int manager_save(Manager *m) {
 836         _cleanup_ordered_set_free_free_ OrderedSet *dns = NULL, *ntp = NULL, *search_domains = NULL, *route_domains = NULL;
 837         Link *link;
 838         Iterator i;
 839         _cleanup_free_ char *temp_path = NULL;
 840         _cleanup_fclose_ FILE *f = NULL;
 841         LinkOperationalState operstate = LINK_OPERSTATE_OFF;
 842         const char *operstate_str;
 843         int r;
 844
 845         assert(m);
 846         assert(m->state_file);
 847
 848         /* We add all NTP and DNS server to a set, to filter out duplicates */
 849         dns = ordered_set_new(&string_hash_ops);
 850         if (!dns)
 851                 return -ENOMEM;
 852
 853         ntp = ordered_set_new(&string_hash_ops);
 854         if (!ntp)
 855                 return -ENOMEM;
 856
 857         search_domains = ordered_set_new(&dns_name_hash_ops);
 858         if (!search_domains)
 859                 return -ENOMEM;
 860
 861         route_domains = ordered_set_new(&dns_name_hash_ops);
 862         if (!route_domains)
 863                 return -ENOMEM;
 864
 865         HASHMAP_FOREACH(link, m->links, i) {
 866                 if (link->flags & IFF_LOOPBACK)
 867                         continue;
 868
 869                 if (link->operstate > operstate)
 870                         operstate = link->operstate;
 871
 872                 if (!link->network)
 873                         continue;
 874
 875                 /* First add the static configured entries */
 876                 r = ordered_set_put_strdupv(dns, link->network->dns);
 877                 if (r < 0)
 878                         return r;
 879
 880                 r = ordered_set_put_strdupv(ntp, link->network->ntp);
 881                 if (r < 0)
 882                         return r;
 883
 884                 r = ordered_set_put_strdupv(search_domains, link->network->search_domains);
 885                 if (r < 0)
 886                         return r;
 887
 888                 r = ordered_set_put_strdupv(route_domains, link->network->route_domains);
 889                 if (r < 0)
 890                         return r;
 891
 892                 if (!link->dhcp_lease)
 893                         continue;
 894
 895                 /* Secondly, add the entries acquired via DHCP */
 896                 if (link->network->dhcp_use_dns) {
 897                         const struct in_addr *addresses;
 898
 899                         r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
 900                         if (r > 0) {
 901                                 r = ordered_set_put_in_addrv(dns, addresses, r);
 902                                 if (r < 0)
 903                                         return r;
 904                         } else if (r < 0 && r != -ENODATA)
 905                                 return r;
 906                 }
 907
 908                 if (link->network->dhcp_use_ntp) {
 909                         const struct in_addr *addresses;
 910
 911                         r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
 912                         if (r > 0) {
 913                                 r = ordered_set_put_in_addrv(ntp, addresses, r);
 914                                 if (r < 0)
 915                                         return r;
 916                         } else if (r < 0 && r != -ENODATA)
 917                                 return r;
 918                 }
 919
 920                 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
 921                         const char *domainname;
 922
 923                         r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname);
 924                         if (r >= 0) {
 925
 926                                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES)
 927                                         r = ordered_set_put_strdup(search_domains, domainname);
 928                                 else
 929                                         r = ordered_set_put_strdup(route_domains, domainname);
 930
 931                                 if (r < 0)
 932                                         return r;
 933                         } else if (r != -ENODATA)
 934                                 return r;
 935                 }
 936         }
 937
 938         operstate_str = link_operstate_to_string(operstate);
 939         assert(operstate_str);
 940
 941         r = fopen_temporary(m->state_file, &f, &temp_path);
 942         if (r < 0)
 943                 return r;
 944
 945         fchmod(fileno(f), 0644);
 946
 947         fprintf(f,
 948                 "# This is private data. Do not parse.\n"
 949                 "OPER_STATE=%s\n", operstate_str);
 950
 951         print_string_set(f, "DNS=", dns);
 952         print_string_set(f, "NTP=", ntp);
 953         print_string_set(f, "DOMAINS=", search_domains);
 954         print_string_set(f, "ROUTE_DOMAINS=", route_domains);
 955
 956         r = fflush_and_check(f);
 957         if (r < 0)
 958                 goto fail;
 959
 960         if (rename(temp_path, m->state_file) < 0) {
 961                 r = -errno;
 962                 goto fail;
 963         }
 964
 965         if (m->operational_state != operstate) {
 966                 m->operational_state = operstate;
 967                 r = manager_send_changed(m, "OperationalState", NULL);
 968                 if (r < 0)
 969                         log_error_errno(r, "Could not emit changed OperationalState: %m");
 970         }
 971
 972         m->dirty = false;
 973
 974         return 0;
 975
 976 fail:
 977         (void) unlink(m->state_file);
 978         (void) unlink(temp_path);
 979
 980         return log_error_errno(r, "Failed to save network state to %s: %m", m->state_file);
 981 }
 982
 983 static int manager_dirty_handler(sd_event_source *s, void *userdata) {
 984         Manager *m = userdata;
 985         Link *link;
 986         Iterator i;
 987         int r;
 988
 989         assert(m);
 990
 991         if (m->dirty)
 992                 manager_save(m);
 993
 994         SET_FOREACH(link, m->dirty_links, i) {
 995                 r = link_save(link);
 996                 if (r >= 0)
 997                         link_clean(link);
 998         }
 999
1000         return 1;
1001 }
1002
1003 int manager_new(Manager **ret) {
1004         _cleanup_manager_free_ Manager *m = NULL;
1005         int r;
1006
1007         m = new0(Manager, 1);
1008         if (!m)
1009                 return -ENOMEM;
1010
1011         m->state_file = strdup("/run/systemd/netif/state");
1012         if (!m->state_file)
1013                 return -ENOMEM;
1014
1015         r = sd_event_default(&m->event);
1016         if (r < 0)
1017                 return r;
1018
1019         sd_event_set_watchdog(m->event, true);
1020
1021         sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
1022         sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
1023
1024         r = sd_event_add_post(m->event, NULL, manager_dirty_handler, m);
1025         if (r < 0)
1026                 return r;
1027
1028         r = manager_connect_rtnl(m);
1029         if (r < 0)
1030                 return r;
1031
1032         r = manager_connect_udev(m);
1033         if (r < 0)
1034                 return r;
1035
1036         m->netdevs = hashmap_new(&string_hash_ops);
1037         if (!m->netdevs)
1038                 return -ENOMEM;
1039
1040         LIST_HEAD_INIT(m->networks);
1041
1042         r = setup_default_address_pool(m);
1043         if (r < 0)
1044                 return r;
1045
1046         m->duid.type = DUID_TYPE_EN;
1047
1048         *ret = m;
1049         m = NULL;
1050
1051         return 0;
1052 }
1053
1054 void manager_free(Manager *m) {
1055         Network *network;
1056         NetDev *netdev;
1057         Link *link;
1058         AddressPool *pool;
1059
1060         if (!m)
1061                 return;
1062
1063         free(m->state_file);
1064
1065         while ((link = hashmap_first(m->links)))
1066                 link_unref(link);
1067         hashmap_free(m->links);
1068
1069         while ((network = m->networks))
1070                 network_free(network);
1071
1072         hashmap_free(m->networks_by_name);
1073
1074         while ((netdev = hashmap_first(m->netdevs)))
1075                 netdev_unref(netdev);
1076         hashmap_free(m->netdevs);
1077
1078         while ((pool = m->address_pools))
1079                 address_pool_free(pool);
1080
1081         sd_netlink_unref(m->rtnl);
1082         sd_event_unref(m->event);
1083
1084         sd_event_source_unref(m->udev_event_source);
1085         udev_monitor_unref(m->udev_monitor);
1086         udev_unref(m->udev);
1087
1088         sd_bus_unref(m->bus);
1089         sd_bus_slot_unref(m->prepare_for_sleep_slot);
1090         sd_event_source_unref(m->bus_retry_event_source);
1091
1092         free(m);
1093 }
1094
1095 static bool manager_check_idle(void *userdata) {
1096         Manager *m = userdata;
1097         Link *link;
1098         Iterator i;
1099
1100         assert(m);
1101
1102         /* Check whether we are idle now. The only case when we decide to be idle is when there's only a loopback
1103          * device around, for which we have no configuration, and which already left the PENDING state. In all other
1104          * cases we are not idle. */
1105
1106         HASHMAP_FOREACH(link, m->links, i) {
1107                 /* We are not woken on udev activity, so let's just wait for the pending udev event */
1108                 if (link->state == LINK_STATE_PENDING)
1109                         return false;
1110
1111                 if ((link->flags & IFF_LOOPBACK) == 0)
1112                         return false;
1113
1114                 if (link->network)
1115                         return false;
1116         }
1117
1118         return true;
1119 }
1120
1121 int manager_run(Manager *m) {
1122         Link *link;
1123         Iterator i;
1124
1125         assert(m);
1126
1127         /* The dirty handler will deal with future serialization, but the first one
1128            must be done explicitly. */
1129
1130         manager_save(m);
1131
1132         HASHMAP_FOREACH(link, m->links, i)
1133                 link_save(link);
1134
1135         if (m->bus)
1136                 return bus_event_loop_with_idle(
1137                                 m->event,
1138                                 m->bus,
1139                                 "org.freedesktop.network1",
1140                                 DEFAULT_EXIT_USEC,
1141                                 manager_check_idle,
1142                                 m);
1143         else
1144                 /* failed to connect to the bus, so we lose exit-on-idle logic,
1145                    this should not happen except if dbus is not around at all */
1146                 return sd_event_loop(m->event);
1147 }
1148
1149 int manager_load_config(Manager *m) {
1150         int r;
1151
1152         /* update timestamp */
1153         paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, true);
1154
1155         r = netdev_load(m);
1156         if (r < 0)
1157                 return r;
1158
1159         r = network_load(m);
1160         if (r < 0)
1161                 return r;
1162
1163         return 0;
1164 }
1165
1166 bool manager_should_reload(Manager *m) {
1167         return paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, false);
1168 }
1169
1170 int manager_rtnl_enumerate_links(Manager *m) {
1171         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
1172         sd_netlink_message *link;
1173         int r;
1174
1175         assert(m);
1176         assert(m->rtnl);
1177
1178         r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
1179         if (r < 0)
1180                 return r;
1181
1182         r = sd_netlink_message_request_dump(req, true);
1183         if (r < 0)
1184                 return r;
1185
1186         r = sd_netlink_call(m->rtnl, req, 0, &reply);
1187         if (r < 0)
1188                 return r;
1189
1190         for (link = reply; link; link = sd_netlink_message_next(link)) {
1191                 int k;
1192
1193                 m->enumerating = true;
1194
1195                 k = manager_rtnl_process_link(m->rtnl, link, m);
1196                 if (k < 0)
1197                         r = k;
1198
1199                 m->enumerating = false;
1200         }
1201
1202         return r;
1203 }
1204
1205 int manager_rtnl_enumerate_addresses(Manager *m) {
1206         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
1207         sd_netlink_message *addr;
1208         int r;
1209
1210         assert(m);
1211         assert(m->rtnl);
1212
1213         r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, 0);
1214         if (r < 0)
1215                 return r;
1216
1217         r = sd_netlink_message_request_dump(req, true);
1218         if (r < 0)
1219                 return r;
1220
1221         r = sd_netlink_call(m->rtnl, req, 0, &reply);
1222         if (r < 0)
1223                 return r;
1224
1225         for (addr = reply; addr; addr = sd_netlink_message_next(addr)) {
1226                 int k;
1227
1228                 m->enumerating = true;
1229
1230                 k = manager_rtnl_process_address(m->rtnl, addr, m);
1231                 if (k < 0)
1232                         r = k;
1233
1234                 m->enumerating = false;
1235         }
1236
1237         return r;
1238 }
1239
1240 int manager_rtnl_enumerate_routes(Manager *m) {
1241         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
1242         sd_netlink_message *route;
1243         int r;
1244
1245         assert(m);
1246         assert(m->rtnl);
1247
1248         r = sd_rtnl_message_new_route(m->rtnl, &req, RTM_GETROUTE, 0, 0);
1249         if (r < 0)
1250                 return r;
1251
1252         r = sd_netlink_message_request_dump(req, true);
1253         if (r < 0)
1254                 return r;
1255
1256         r = sd_netlink_call(m->rtnl, req, 0, &reply);
1257         if (r < 0)
1258                 return r;
1259
1260         for (route = reply; route; route = sd_netlink_message_next(route)) {
1261                 int k;
1262
1263                 m->enumerating = true;
1264
1265                 k = manager_rtnl_process_route(m->rtnl, route, m);
1266                 if (k < 0)
1267                         r = k;
1268
1269                 m->enumerating = false;
1270         }
1271
1272         return r;
1273 }
1274
1275 int manager_address_pool_acquire(Manager *m, int family, unsigned prefixlen, union in_addr_union *found) {
1276         AddressPool *p;
1277         int r;
1278
1279         assert(m);
1280         assert(prefixlen > 0);
1281         assert(found);
1282
1283         LIST_FOREACH(address_pools, p, m->address_pools) {
1284                 if (p->family != family)
1285                         continue;
1286
1287                 r = address_pool_acquire(p, prefixlen, found);
1288                 if (r != 0)
1289                         return r;
1290         }
1291
1292         return 0;
1293 }
1294
1295 Link* manager_find_uplink(Manager *m, Link *exclude) {
1296         _cleanup_free_ struct local_address *gateways = NULL;
1297         int n, i;
1298
1299         assert(m);
1300
1301         /* Looks for a suitable "uplink", via black magic: an
1302          * interface that is up and where the default route with the
1303          * highest priority points to. */
1304
1305         n = local_gateways(m->rtnl, 0, AF_UNSPEC, &gateways);
1306         if (n < 0) {
1307                 log_warning_errno(n, "Failed to determine list of default gateways: %m");
1308                 return NULL;
1309         }
1310
1311         for (i = 0; i < n; i++) {
1312                 Link *link;
1313
1314                 link = hashmap_get(m->links, INT_TO_PTR(gateways[i].ifindex));
1315                 if (!link) {
1316                         log_debug("Weird, found a gateway for a link we don't know. Ignoring.");
1317                         continue;
1318                 }
1319
1320                 if (link == exclude)
1321                         continue;
1322
1323                 if (link->operstate < LINK_OPERSTATE_ROUTABLE)
1324                         continue;
1325
1326                 return link;
1327         }
1328
1329         return NULL;
1330 }
1331
1332 void manager_dirty(Manager *manager) {
1333         assert(manager);
1334
1335         /* the serialized state in /run is no longer up-to-date */
1336         manager->dirty = true;
1337 }