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