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-manager.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 < 0) {
 140                 /* We failed to connect? Yuck, we must be in early
 141                  * boot. Let's try in 5s again. */
 142
 143                 log_debug_errno(r, "Failed to connect to bus, trying again in 5s: %m");
 144
 145                 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);
 146                 if (r < 0)
 147                         return log_error_errno(r, "Failed to install bus reconnect time event: %m");
 148
 149                 return 0;
 150         }
 151
 152         if (r < 0)
 153                 return r;
 154
 155         r = sd_bus_add_match(m->bus, &m->prepare_for_sleep_slot,
 156                              "type='signal',"
 157                              "sender='org.freedesktop.login1',"
 158                              "interface='org.freedesktop.login1.Manager',"
 159                              "member='PrepareForSleep',"
 160                              "path='/org/freedesktop/login1'",
 161                              match_prepare_for_sleep,
 162                              m);
 163         if (r < 0)
 164                 return log_error_errno(r, "Failed to add match for PrepareForSleep: %m");
 165
 166         r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/network1", "org.freedesktop.network1.Manager", manager_vtable, m);
 167         if (r < 0)
 168                 return log_error_errno(r, "Failed to add manager object vtable: %m");
 169
 170         r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/network1/link", "org.freedesktop.network1.Link", link_vtable, link_object_find, m);
 171         if (r < 0)
 172                return log_error_errno(r, "Failed to add link object vtable: %m");
 173
 174         r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/network1/link", link_node_enumerator, m);
 175         if (r < 0)
 176                 return log_error_errno(r, "Failed to add link enumerator: %m");
 177
 178         r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/network1/network", "org.freedesktop.network1.Network", network_vtable, network_object_find, m);
 179         if (r < 0)
 180                return log_error_errno(r, "Failed to add network object vtable: %m");
 181
 182         r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/network1/network", network_node_enumerator, m);
 183         if (r < 0)
 184                 return log_error_errno(r, "Failed to add network enumerator: %m");
 185
 186         r = sd_bus_request_name(m->bus, "org.freedesktop.network1", 0);
 187         if (r < 0)
 188                 return log_error_errno(r, "Failed to register name: %m");
 189
 190         r = sd_bus_attach_event(m->bus, m->event, 0);
 191         if (r < 0)
 192                 return log_error_errno(r, "Failed to attach bus to event loop: %m");
 193
 194        /* Did we get a timezone or transient hostname from DHCP while D-Bus wasn't up yet? */
 195         if (m->dynamic_hostname) {
 196                 r = manager_set_hostname(m, m->dynamic_hostname);
 197                 if (r < 0)
 198                         return r;
 199         }
 200         if (m->dynamic_timezone) {
 201                 r = manager_set_timezone(m, m->dynamic_timezone);
 202                 if (r < 0)
 203                         return r;
 204         }
 205
 206         return 0;
 207 }
 208
 209 static int manager_udev_process_link(Manager *m, struct udev_device *device) {
 210         Link *link = NULL;
 211         int r, ifindex;
 212
 213         assert(m);
 214         assert(device);
 215
 216         if (!streq_ptr(udev_device_get_action(device), "add"))
 217                 return 0;
 218
 219         ifindex = udev_device_get_ifindex(device);
 220         if (ifindex <= 0) {
 221                 log_debug("Ignoring udev ADD event for device with invalid ifindex");
 222                 return 0;
 223         }
 224
 225         r = link_get(m, ifindex, &link);
 226         if (r == -ENODEV)
 227                 return 0;
 228         else if (r < 0)
 229                 return r;
 230
 231         r = link_initialized(link, device);
 232         if (r < 0)
 233                 return r;
 234
 235         return 0;
 236 }
 237
 238 static int manager_dispatch_link_udev(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
 239         Manager *m = userdata;
 240         struct udev_monitor *monitor = m->udev_monitor;
 241         _cleanup_udev_device_unref_ struct udev_device *device = NULL;
 242
 243         device = udev_monitor_receive_device(monitor);
 244         if (!device)
 245                 return -ENOMEM;
 246
 247         manager_udev_process_link(m, device);
 248         return 0;
 249 }
 250
 251 static int manager_connect_udev(Manager *m) {
 252         int r;
 253
 254         /* udev does not initialize devices inside containers,
 255          * so we rely on them being already initialized before
 256          * entering the container */
 257         if (detect_container() > 0)
 258                 return 0;
 259
 260         m->udev = udev_new();
 261         if (!m->udev)
 262                 return -ENOMEM;
 263
 264         m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
 265         if (!m->udev_monitor)
 266                 return -ENOMEM;
 267
 268         r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "net", NULL);
 269         if (r < 0)
 270                 return log_error_errno(r, "Could not add udev monitor filter: %m");
 271
 272         r = udev_monitor_enable_receiving(m->udev_monitor);
 273         if (r < 0) {
 274                 log_error("Could not enable udev monitor");
 275                 return r;
 276         }
 277
 278         r = sd_event_add_io(m->event,
 279                         &m->udev_event_source,
 280                         udev_monitor_get_fd(m->udev_monitor),
 281                         EPOLLIN, manager_dispatch_link_udev,
 282                         m);
 283         if (r < 0)
 284                 return r;
 285
 286         r = sd_event_source_set_description(m->udev_event_source, "networkd-udev");
 287         if (r < 0)
 288                 return r;
 289
 290         return 0;
 291 }
 292
 293 int manager_rtnl_process_route(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) {
 294         Manager *m = userdata;
 295         Link *link = NULL;
 296         uint16_t type;
 297         uint32_t ifindex, priority = 0;
 298         unsigned char protocol, scope, tos, table;
 299         int family;
 300         unsigned char dst_prefixlen, src_prefixlen;
 301         union in_addr_union dst = {}, gw = {}, src = {}, prefsrc = {};
 302         Route *route = NULL;
 303         int r;
 304
 305         assert(rtnl);
 306         assert(message);
 307         assert(m);
 308
 309         if (sd_netlink_message_is_error(message)) {
 310                 r = sd_netlink_message_get_errno(message);
 311                 if (r < 0)
 312                         log_warning_errno(r, "rtnl: failed to receive route: %m");
 313
 314                 return 0;
 315         }
 316
 317         r = sd_netlink_message_get_type(message, &type);
 318         if (r < 0) {
 319                 log_warning_errno(r, "rtnl: could not get message type: %m");
 320                 return 0;
 321         } else if (type != RTM_NEWROUTE && type != RTM_DELROUTE) {
 322                 log_warning("rtnl: received unexpected message type when processing route");
 323                 return 0;
 324         }
 325
 326         r = sd_netlink_message_read_u32(message, RTA_OIF, &ifindex);
 327         if (r == -ENODATA) {
 328                 log_debug("rtnl: received route without ifindex, ignoring");
 329                 return 0;
 330         } else if (r < 0) {
 331                 log_warning_errno(r, "rtnl: could not get ifindex from route, ignoring: %m");
 332                 return 0;
 333         } else if (ifindex <= 0) {
 334                 log_warning("rtnl: received route message with invalid ifindex, ignoring: %d", ifindex);
 335                 return 0;
 336         } else {
 337                 r = link_get(m, ifindex, &link);
 338                 if (r < 0 || !link) {
 339                         /* when enumerating we might be out of sync, but we will
 340                          * get the route again, so just ignore it */
 341                         if (!m->enumerating)
 342                                 log_warning("rtnl: received route for nonexistent link (%d), ignoring", ifindex);
 343                         return 0;
 344                 }
 345         }
 346
 347         r = sd_rtnl_message_route_get_family(message, &family);
 348         if (r < 0 || !IN_SET(family, AF_INET, AF_INET6)) {
 349                 log_link_warning(link, "rtnl: received address with invalid family, ignoring.");
 350                 return 0;
 351         }
 352
 353         r = sd_rtnl_message_route_get_protocol(message, &protocol);
 354         if (r < 0) {
 355                 log_warning_errno(r, "rtnl: could not get route protocol: %m");
 356                 return 0;
 357         }
 358
 359         switch (family) {
 360         case AF_INET:
 361                 r = sd_netlink_message_read_in_addr(message, RTA_DST, &dst.in);
 362                 if (r < 0 && r != -ENODATA) {
 363                         log_link_warning_errno(link, r, "rtnl: received route without valid destination, ignoring: %m");
 364                         return 0;
 365                 }
 366
 367                 r = sd_netlink_message_read_in_addr(message, RTA_GATEWAY, &gw.in);
 368                 if (r < 0 && r != -ENODATA) {
 369                         log_link_warning_errno(link, r, "rtnl: received route with invalid gateway, ignoring: %m");
 370                         return 0;
 371                 }
 372
 373                 r = sd_netlink_message_read_in_addr(message, RTA_SRC, &src.in);
 374                 if (r < 0 && r != -ENODATA) {
 375                         log_link_warning_errno(link, r, "rtnl: received route with invalid source, ignoring: %m");
 376                         return 0;
 377                 }
 378
 379                 r = sd_netlink_message_read_in_addr(message, RTA_PREFSRC, &prefsrc.in);
 380                 if (r < 0 && r != -ENODATA) {
 381                         log_link_warning_errno(link, r, "rtnl: received route with invalid preferred source, ignoring: %m");
 382                         return 0;
 383                 }
 384
 385                 break;
 386
 387         case AF_INET6:
 388                 r = sd_netlink_message_read_in6_addr(message, RTA_DST, &dst.in6);
 389                 if (r < 0 && r != -ENODATA) {
 390                         log_link_warning_errno(link, r, "rtnl: received route without valid destination, ignoring: %m");
 391                         return 0;
 392                 }
 393
 394                 r = sd_netlink_message_read_in6_addr(message, RTA_GATEWAY, &gw.in6);
 395                 if (r < 0 && r != -ENODATA) {
 396                         log_link_warning_errno(link, r, "rtnl: received route with invalid gateway, ignoring: %m");
 397                         return 0;
 398                 }
 399
 400                 r = sd_netlink_message_read_in6_addr(message, RTA_SRC, &src.in6);
 401                 if (r < 0 && r != -ENODATA) {
 402                         log_link_warning_errno(link, r, "rtnl: received route with invalid source, ignoring: %m");
 403                         return 0;
 404                 }
 405
 406                 r = sd_netlink_message_read_in6_addr(message, RTA_PREFSRC, &prefsrc.in6);
 407                 if (r < 0 && r != -ENODATA) {
 408                         log_link_warning_errno(link, r, "rtnl: received route with invalid preferred source, ignoring: %m");
 409                         return 0;
 410                 }
 411
 412                 break;
 413
 414         default:
 415                 log_link_debug(link, "rtnl: ignoring unsupported address family: %d", family);
 416                 return 0;
 417         }
 418
 419         r = sd_rtnl_message_route_get_dst_prefixlen(message, &dst_prefixlen);
 420         if (r < 0) {
 421                 log_link_warning_errno(link, r, "rtnl: received route with invalid destination prefixlen, ignoring: %m");
 422                 return 0;
 423         }
 424
 425         r = sd_rtnl_message_route_get_src_prefixlen(message, &src_prefixlen);
 426         if (r < 0) {
 427                 log_link_warning_errno(link, r, "rtnl: received route with invalid source prefixlen, ignoring: %m");
 428                 return 0;
 429         }
 430
 431         r = sd_rtnl_message_route_get_scope(message, &scope);
 432         if (r < 0) {
 433                 log_link_warning_errno(link, r, "rtnl: received route with invalid scope, ignoring: %m");
 434                 return 0;
 435         }
 436
 437         r = sd_rtnl_message_route_get_tos(message, &tos);
 438         if (r < 0) {
 439                 log_link_warning_errno(link, r, "rtnl: received route with invalid tos, ignoring: %m");
 440                 return 0;
 441         }
 442
 443         r = sd_rtnl_message_route_get_table(message, &table);
 444         if (r < 0) {
 445                 log_link_warning_errno(link, r, "rtnl: received route with invalid table, ignoring: %m");
 446                 return 0;
 447         }
 448
 449         r = sd_netlink_message_read_u32(message, RTA_PRIORITY, &priority);
 450         if (r < 0 && r != -ENODATA) {
 451                 log_link_warning_errno(link, r, "rtnl: received route with invalid priority, ignoring: %m");
 452                 return 0;
 453         }
 454
 455         route_get(link, family, &dst, dst_prefixlen, tos, priority, table, &route);
 456
 457         switch (type) {
 458         case RTM_NEWROUTE:
 459                 if (!route) {
 460                         /* A route appeared that we did not request */
 461                         r = route_add_foreign(link, family, &dst, dst_prefixlen, tos, priority, table, &route);
 462                         if (r < 0)
 463                                 return 0;
 464                 }
 465
 466                 route_update(route, &src, src_prefixlen, &gw, &prefsrc, scope, protocol);
 467
 468                 break;
 469
 470         case RTM_DELROUTE:
 471                 route_free(route);
 472                 break;
 473
 474         default:
 475                 assert_not_reached("Received invalid RTNL message type");
 476         }
 477
 478         return 1;
 479 }
 480
 481 int manager_rtnl_process_address(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) {
 482         Manager *m = userdata;
 483         Link *link = NULL;
 484         uint16_t type;
 485         unsigned char flags;
 486         int family;
 487         unsigned char prefixlen;
 488         unsigned char scope;
 489         union in_addr_union in_addr;
 490         struct ifa_cacheinfo cinfo;
 491         Address *address = NULL;
 492         char buf[INET6_ADDRSTRLEN], valid_buf[FORMAT_TIMESPAN_MAX];
 493         const char *valid_str = NULL;
 494         int r, ifindex;
 495
 496         assert(rtnl);
 497         assert(message);
 498         assert(m);
 499
 500         if (sd_netlink_message_is_error(message)) {
 501                 r = sd_netlink_message_get_errno(message);
 502                 if (r < 0)
 503                         log_warning_errno(r, "rtnl: failed to receive address: %m");
 504
 505                 return 0;
 506         }
 507
 508         r = sd_netlink_message_get_type(message, &type);
 509         if (r < 0) {
 510                 log_warning_errno(r, "rtnl: could not get message type: %m");
 511                 return 0;
 512         } else if (type != RTM_NEWADDR && type != RTM_DELADDR) {
 513                 log_warning("rtnl: received unexpected message type when processing address");
 514                 return 0;
 515         }
 516
 517         r = sd_rtnl_message_addr_get_ifindex(message, &ifindex);
 518         if (r < 0) {
 519                 log_warning_errno(r, "rtnl: could not get ifindex from address: %m");
 520                 return 0;
 521         } else if (ifindex <= 0) {
 522                 log_warning("rtnl: received address message with invalid ifindex: %d", ifindex);
 523                 return 0;
 524         } else {
 525                 r = link_get(m, ifindex, &link);
 526                 if (r < 0 || !link) {
 527                         /* when enumerating we might be out of sync, but we will
 528                          * get the address again, so just ignore it */
 529                         if (!m->enumerating)
 530                                 log_warning("rtnl: received address for nonexistent link (%d), ignoring", ifindex);
 531                         return 0;
 532                 }
 533         }
 534
 535         r = sd_rtnl_message_addr_get_family(message, &family);
 536         if (r < 0 || !IN_SET(family, AF_INET, AF_INET6)) {
 537                 log_link_warning(link, "rtnl: received address with invalid family, ignoring.");
 538                 return 0;
 539         }
 540
 541         r = sd_rtnl_message_addr_get_prefixlen(message, &prefixlen);
 542         if (r < 0) {
 543                 log_link_warning_errno(link, r, "rtnl: received address with invalid prefixlen, ignoring: %m");
 544                 return 0;
 545         }
 546
 547         r = sd_rtnl_message_addr_get_scope(message, &scope);
 548         if (r < 0) {
 549                 log_link_warning_errno(link, r, "rtnl: received address with invalid scope, ignoring: %m");
 550                 return 0;
 551         }
 552
 553         r = sd_rtnl_message_addr_get_flags(message, &flags);
 554         if (r < 0) {
 555                 log_link_warning_errno(link, r, "rtnl: received address with invalid flags, ignoring: %m");
 556                 return 0;
 557         }
 558
 559         switch (family) {
 560         case AF_INET:
 561                 r = sd_netlink_message_read_in_addr(message, IFA_LOCAL, &in_addr.in);
 562                 if (r < 0) {
 563                         log_link_warning_errno(link, r, "rtnl: received address without valid address, ignoring: %m");
 564                         return 0;
 565                 }
 566
 567                 break;
 568
 569         case AF_INET6:
 570                 r = sd_netlink_message_read_in6_addr(message, IFA_ADDRESS, &in_addr.in6);
 571                 if (r < 0) {
 572                         log_link_warning_errno(link, r, "rtnl: received address without valid address, ignoring: %m");
 573                         return 0;
 574                 }
 575
 576                 break;
 577
 578         default:
 579                 log_link_debug(link, "rtnl: ignoring unsupported address family: %d", family);
 580         }
 581
 582         if (!inet_ntop(family, &in_addr, buf, INET6_ADDRSTRLEN)) {
 583                 log_link_warning(link, "Could not print address");
 584                 return 0;
 585         }
 586
 587         r = sd_netlink_message_read_cache_info(message, IFA_CACHEINFO, &cinfo);
 588         if (r >= 0) {
 589                 if (cinfo.ifa_valid != CACHE_INFO_INFINITY_LIFE_TIME)
 590                         valid_str = format_timespan(valid_buf, FORMAT_TIMESPAN_MAX,
 591                                                     cinfo.ifa_valid * USEC_PER_SEC,
 592                                                     USEC_PER_SEC);
 593         }
 594
 595         address_get(link, family, &in_addr, prefixlen, &address);
 596
 597         switch (type) {
 598         case RTM_NEWADDR:
 599                 if (address)
 600                         log_link_debug(link, "Updating address: %s/%u (valid %s%s)", buf, prefixlen,
 601                                        valid_str ? "for " : "forever", valid_str ?: "");
 602                 else {
 603                         /* An address appeared that we did not request */
 604                         r = address_add_foreign(link, family, &in_addr, prefixlen, &address);
 605                         if (r < 0) {
 606                                 log_link_warning_errno(link, r, "Failed to add address %s/%u: %m", buf, prefixlen);
 607                                 return 0;
 608                         } else
 609                                 log_link_debug(link, "Adding address: %s/%u (valid %s%s)", buf, prefixlen,
 610                                                valid_str ? "for " : "forever", valid_str ?: "");
 611                 }
 612
 613                 address_update(address, flags, scope, &cinfo);
 614
 615                 break;
 616
 617         case RTM_DELADDR:
 618
 619                 if (address) {
 620                         log_link_debug(link, "Removing address: %s/%u (valid %s%s)", buf, prefixlen,
 621                                        valid_str ? "for " : "forever", valid_str ?: "");
 622                         address_drop(address);
 623                 } else
 624                         log_link_warning(link, "Removing non-existent address: %s/%u (valid %s%s)", buf, prefixlen,
 625                                          valid_str ? "for " : "forever", valid_str ?: "");
 626
 627                 break;
 628         default:
 629                 assert_not_reached("Received invalid RTNL message type");
 630         }
 631
 632         return 1;
 633 }
 634
 635 static int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) {
 636         Manager *m = userdata;
 637         Link *link = NULL;
 638         NetDev *netdev = NULL;
 639         uint16_t type;
 640         const char *name;
 641         int r, ifindex;
 642
 643         assert(rtnl);
 644         assert(message);
 645         assert(m);
 646
 647         if (sd_netlink_message_is_error(message)) {
 648                 r = sd_netlink_message_get_errno(message);
 649                 if (r < 0)
 650                         log_warning_errno(r, "rtnl: Could not receive link: %m");
 651
 652                 return 0;
 653         }
 654
 655         r = sd_netlink_message_get_type(message, &type);
 656         if (r < 0) {
 657                 log_warning_errno(r, "rtnl: Could not get message type: %m");
 658                 return 0;
 659         } else if (type != RTM_NEWLINK && type != RTM_DELLINK) {
 660                 log_warning("rtnl: Received unexpected message type when processing link");
 661                 return 0;
 662         }
 663
 664         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 665         if (r < 0) {
 666                 log_warning_errno(r, "rtnl: Could not get ifindex from link: %m");
 667                 return 0;
 668         } else if (ifindex <= 0) {
 669                 log_warning("rtnl: received link message with invalid ifindex: %d", ifindex);
 670                 return 0;
 671         }
 672
 673         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
 674         if (r < 0) {
 675                 log_warning_errno(r, "rtnl: Received link message without ifname: %m");
 676                 return 0;
 677         }
 678
 679         (void) link_get(m, ifindex, &link);
 680         (void) netdev_get(m, name, &netdev);
 681
 682         switch (type) {
 683         case RTM_NEWLINK:
 684                 if (!link) {
 685                         /* link is new, so add it */
 686                         r = link_add(m, message, &link);
 687                         if (r < 0) {
 688                                 log_warning_errno(r, "Could not add new link: %m");
 689                                 return 0;
 690                         }
 691                 }
 692
 693                 if (netdev) {
 694                         /* netdev exists, so make sure the ifindex matches */
 695                         r = netdev_set_ifindex(netdev, message);
 696                         if (r < 0) {
 697                                 log_warning_errno(r, "Could not set ifindex on netdev: %m");
 698                                 return 0;
 699                         }
 700                 }
 701
 702                 r = link_update(link, message);
 703                 if (r < 0)
 704                         return 0;
 705
 706                 break;
 707
 708         case RTM_DELLINK:
 709                 link_drop(link);
 710                 netdev_drop(netdev);
 711
 712                 break;
 713
 714         default:
 715                 assert_not_reached("Received invalid RTNL message type.");
 716         }
 717
 718         return 1;
 719 }
 720
 721 static int systemd_netlink_fd(void) {
 722         int n, fd, rtnl_fd = -EINVAL;
 723
 724         n = sd_listen_fds(true);
 725         if (n <= 0)
 726                 return -EINVAL;
 727
 728         for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd ++) {
 729                 if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1) > 0) {
 730                         if (rtnl_fd >= 0)
 731                                 return -EINVAL;
 732
 733                         rtnl_fd = fd;
 734                 }
 735         }
 736
 737         return rtnl_fd;
 738 }
 739
 740 static int manager_connect_rtnl(Manager *m) {
 741         int fd, r;
 742
 743         assert(m);
 744
 745         fd = systemd_netlink_fd();
 746         if (fd < 0)
 747                 r = sd_netlink_open(&m->rtnl);
 748         else
 749                 r = sd_netlink_open_fd(&m->rtnl, fd);
 750         if (r < 0)
 751                 return r;
 752
 753         r = sd_netlink_inc_rcvbuf(m->rtnl, RCVBUF_SIZE);
 754         if (r < 0)
 755                 return r;
 756
 757         r = sd_netlink_attach_event(m->rtnl, m->event, 0);
 758         if (r < 0)
 759                 return r;
 760
 761         r = sd_netlink_add_match(m->rtnl, RTM_NEWLINK, &manager_rtnl_process_link, m);
 762         if (r < 0)
 763                 return r;
 764
 765         r = sd_netlink_add_match(m->rtnl, RTM_DELLINK, &manager_rtnl_process_link, m);
 766         if (r < 0)
 767                 return r;
 768
 769         r = sd_netlink_add_match(m->rtnl, RTM_NEWADDR, &manager_rtnl_process_address, m);
 770         if (r < 0)
 771                 return r;
 772
 773         r = sd_netlink_add_match(m->rtnl, RTM_DELADDR, &manager_rtnl_process_address, m);
 774         if (r < 0)
 775                 return r;
 776
 777         r = sd_netlink_add_match(m->rtnl, RTM_NEWROUTE, &manager_rtnl_process_route, m);
 778         if (r < 0)
 779                 return r;
 780
 781         r = sd_netlink_add_match(m->rtnl, RTM_DELROUTE, &manager_rtnl_process_route, m);
 782         if (r < 0)
 783                 return r;
 784
 785         return 0;
 786 }
 787
 788 static int ordered_set_put_in_addr_data(OrderedSet *s, const struct in_addr_data *address) {
 789         char *p;
 790         int r;
 791
 792         assert(s);
 793         assert(address);
 794
 795         r = in_addr_to_string(address->family, &address->address, &p);
 796         if (r < 0)
 797                 return r;
 798
 799         r = ordered_set_consume(s, p);
 800         if (r == -EEXIST)
 801                 return 0;
 802
 803         return r;
 804 }
 805
 806 static int ordered_set_put_in_addr_datav(OrderedSet *s, const struct in_addr_data *addresses, unsigned n) {
 807         int r, c = 0;
 808         unsigned i;
 809
 810         assert(s);
 811         assert(addresses || n == 0);
 812
 813         for (i = 0; i < n; i++) {
 814                 r = ordered_set_put_in_addr_data(s, addresses+i);
 815                 if (r < 0)
 816                         return r;
 817
 818                 c += r;
 819         }
 820
 821         return c;
 822 }
 823
 824 static int ordered_set_put_in4_addr(OrderedSet *s, const struct in_addr *address) {
 825         char *p;
 826         int r;
 827
 828         assert(s);
 829         assert(address);
 830
 831         r = in_addr_to_string(AF_INET, (const union in_addr_union*) address, &p);
 832         if (r < 0)
 833                 return r;
 834
 835         r = ordered_set_consume(s, p);
 836         if (r == -EEXIST)
 837                 return 0;
 838
 839         return r;
 840 }
 841
 842 static int ordered_set_put_in4_addrv(OrderedSet *s, const struct in_addr *addresses, unsigned n) {
 843         int r, c = 0;
 844         unsigned i;
 845
 846         assert(s);
 847         assert(n == 0 || addresses);
 848
 849         for (i = 0; i < n; i++) {
 850                 r = ordered_set_put_in4_addr(s, addresses+i);
 851                 if (r < 0)
 852                         return r;
 853
 854                 c += r;
 855         }
 856
 857         return c;
 858 }
 859
 860 static void print_string_set(FILE *f, const char *field, OrderedSet *s) {
 861         bool space = false;
 862         Iterator i;
 863         char *p;
 864
 865         if (ordered_set_isempty(s))
 866                 return;
 867
 868         fputs_unlocked(field, f);
 869
 870         ORDERED_SET_FOREACH(p, s, i)
 871                 fputs_with_space(f, p, NULL, &space);
 872
 873         fputc_unlocked('\n', f);
 874 }
 875
 876 static int manager_save(Manager *m) {
 877         _cleanup_ordered_set_free_free_ OrderedSet *dns = NULL, *ntp = NULL, *search_domains = NULL, *route_domains = NULL;
 878         Link *link;
 879         Iterator i;
 880         _cleanup_free_ char *temp_path = NULL;
 881         _cleanup_fclose_ FILE *f = NULL;
 882         LinkOperationalState operstate = LINK_OPERSTATE_OFF;
 883         const char *operstate_str;
 884         int r;
 885
 886         assert(m);
 887         assert(m->state_file);
 888
 889         /* We add all NTP and DNS server to a set, to filter out duplicates */
 890         dns = ordered_set_new(&string_hash_ops);
 891         if (!dns)
 892                 return -ENOMEM;
 893
 894         ntp = ordered_set_new(&string_hash_ops);
 895         if (!ntp)
 896                 return -ENOMEM;
 897
 898         search_domains = ordered_set_new(&dns_name_hash_ops);
 899         if (!search_domains)
 900                 return -ENOMEM;
 901
 902         route_domains = ordered_set_new(&dns_name_hash_ops);
 903         if (!route_domains)
 904                 return -ENOMEM;
 905
 906         HASHMAP_FOREACH(link, m->links, i) {
 907                 if (link->flags & IFF_LOOPBACK)
 908                         continue;
 909
 910                 if (link->operstate > operstate)
 911                         operstate = link->operstate;
 912
 913                 if (!link->network)
 914                         continue;
 915
 916                 /* First add the static configured entries */
 917                 r = ordered_set_put_in_addr_datav(dns, link->network->dns, link->network->n_dns);
 918                 if (r < 0)
 919                         return r;
 920
 921                 r = ordered_set_put_strdupv(ntp, link->network->ntp);
 922                 if (r < 0)
 923                         return r;
 924
 925                 r = ordered_set_put_strdupv(search_domains, link->network->search_domains);
 926                 if (r < 0)
 927                         return r;
 928
 929                 r = ordered_set_put_strdupv(route_domains, link->network->route_domains);
 930                 if (r < 0)
 931                         return r;
 932
 933                 if (!link->dhcp_lease)
 934                         continue;
 935
 936                 /* Secondly, add the entries acquired via DHCP */
 937                 if (link->network->dhcp_use_dns) {
 938                         const struct in_addr *addresses;
 939
 940                         r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
 941                         if (r > 0) {
 942                                 r = ordered_set_put_in4_addrv(dns, addresses, r);
 943                                 if (r < 0)
 944                                         return r;
 945                         } else if (r < 0 && r != -ENODATA)
 946                                 return r;
 947                 }
 948
 949                 if (link->network->dhcp_use_ntp) {
 950                         const struct in_addr *addresses;
 951
 952                         r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
 953                         if (r > 0) {
 954                                 r = ordered_set_put_in4_addrv(ntp, addresses, r);
 955                                 if (r < 0)
 956                                         return r;
 957                         } else if (r < 0 && r != -ENODATA)
 958                                 return r;
 959                 }
 960
 961                 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
 962                         const char *domainname;
 963                         char **domains = NULL;
 964
 965                         OrderedSet *target_domains = (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) ? search_domains : route_domains;
 966                         r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname);
 967                         if (r >= 0) {
 968                                 r = ordered_set_put_strdup(target_domains, domainname);
 969                                 if (r < 0)
 970                                         return r;
 971                         } else if (r != -ENODATA)
 972                                 return r;
 973
 974                         r = sd_dhcp_lease_get_search_domains(link->dhcp_lease, &domains);
 975                         if (r >= 0) {
 976                                 r = ordered_set_put_strdupv(target_domains, domains);
 977                                 if (r < 0)
 978                                         return r;
 979                         } else if (r != -ENODATA)
 980                                 return r;
 981                 }
 982         }
 983
 984         operstate_str = link_operstate_to_string(operstate);
 985         assert(operstate_str);
 986
 987         r = fopen_temporary(m->state_file, &f, &temp_path);
 988         if (r < 0)
 989                 return r;
 990
 991         (void) fchmod(fileno(f), 0644);
 992
 993         fprintf(f,
 994                 "# This is private data. Do not parse.\n"
 995                 "OPER_STATE=%s\n", operstate_str);
 996
 997         print_string_set(f, "DNS=", dns);
 998         print_string_set(f, "NTP=", ntp);
 999         print_string_set(f, "DOMAINS=", search_domains);
1000         print_string_set(f, "ROUTE_DOMAINS=", route_domains);
1001
1002         r = fflush_and_check(f);
1003         if (r < 0)
1004                 goto fail;
1005
1006         if (rename(temp_path, m->state_file) < 0) {
1007                 r = -errno;
1008                 goto fail;
1009         }
1010
1011         if (m->operational_state != operstate) {
1012                 m->operational_state = operstate;
1013                 r = manager_send_changed(m, "OperationalState", NULL);
1014                 if (r < 0)
1015                         log_error_errno(r, "Could not emit changed OperationalState: %m");
1016         }
1017
1018         m->dirty = false;
1019
1020         return 0;
1021
1022 fail:
1023         (void) unlink(m->state_file);
1024         (void) unlink(temp_path);
1025
1026         return log_error_errno(r, "Failed to save network state to %s: %m", m->state_file);
1027 }
1028
1029 static int manager_dirty_handler(sd_event_source *s, void *userdata) {
1030         Manager *m = userdata;
1031         Link *link;
1032         Iterator i;
1033         int r;
1034
1035         assert(m);
1036
1037         if (m->dirty)
1038                 manager_save(m);
1039
1040         SET_FOREACH(link, m->dirty_links, i) {
1041                 r = link_save(link);
1042                 if (r >= 0)
1043                         link_clean(link);
1044         }
1045
1046         return 1;
1047 }
1048
1049 int manager_new(Manager **ret, sd_event *event) {
1050         _cleanup_manager_free_ Manager *m = NULL;
1051         int r;
1052
1053         m = new0(Manager, 1);
1054         if (!m)
1055                 return -ENOMEM;
1056
1057         m->state_file = strdup("/run/systemd/netif/state");
1058         if (!m->state_file)
1059                 return -ENOMEM;
1060
1061         m->event = sd_event_ref(event);
1062
1063         r = sd_event_add_post(m->event, NULL, manager_dirty_handler, m);
1064         if (r < 0)
1065                 return r;
1066
1067         r = manager_connect_rtnl(m);
1068         if (r < 0)
1069                 return r;
1070
1071         r = manager_connect_udev(m);
1072         if (r < 0)
1073                 return r;
1074
1075         m->netdevs = hashmap_new(&string_hash_ops);
1076         if (!m->netdevs)
1077                 return -ENOMEM;
1078
1079         LIST_HEAD_INIT(m->networks);
1080
1081         r = setup_default_address_pool(m);
1082         if (r < 0)
1083                 return r;
1084
1085         m->duid.type = DUID_TYPE_EN;
1086
1087         *ret = m;
1088         m = NULL;
1089
1090         return 0;
1091 }
1092
1093 void manager_free(Manager *m) {
1094         Network *network;
1095         NetDev *netdev;
1096         Link *link;
1097         AddressPool *pool;
1098
1099         if (!m)
1100                 return;
1101
1102         free(m->state_file);
1103
1104         while ((link = hashmap_first(m->links)))
1105                 link_unref(link);
1106         hashmap_free(m->links);
1107
1108         while ((network = m->networks))
1109                 network_free(network);
1110
1111         hashmap_free(m->networks_by_name);
1112
1113         while ((netdev = hashmap_first(m->netdevs)))
1114                 netdev_unref(netdev);
1115         hashmap_free(m->netdevs);
1116
1117         while ((pool = m->address_pools))
1118                 address_pool_free(pool);
1119
1120         sd_netlink_unref(m->rtnl);
1121         sd_event_unref(m->event);
1122
1123         sd_event_source_unref(m->udev_event_source);
1124         udev_monitor_unref(m->udev_monitor);
1125         udev_unref(m->udev);
1126
1127         sd_bus_unref(m->bus);
1128         sd_bus_slot_unref(m->prepare_for_sleep_slot);
1129         sd_event_source_unref(m->bus_retry_event_source);
1130
1131         free(m->dynamic_timezone);
1132         free(m->dynamic_hostname);
1133
1134         free(m);
1135 }
1136
1137 int manager_start(Manager *m) {
1138         Link *link;
1139         Iterator i;
1140
1141         assert(m);
1142
1143         /* The dirty handler will deal with future serialization, but the first one
1144            must be done explicitly. */
1145
1146         manager_save(m);
1147
1148         HASHMAP_FOREACH(link, m->links, i)
1149                 link_save(link);
1150
1151         return 0;
1152 }
1153
1154 int manager_load_config(Manager *m) {
1155         int r;
1156
1157         /* update timestamp */
1158         paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, true);
1159
1160         r = netdev_load(m);
1161         if (r < 0)
1162                 return r;
1163
1164         r = network_load(m);
1165         if (r < 0)
1166                 return r;
1167
1168         return 0;
1169 }
1170
1171 bool manager_should_reload(Manager *m) {
1172         return paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, false);
1173 }
1174
1175 int manager_rtnl_enumerate_links(Manager *m) {
1176         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
1177         sd_netlink_message *link;
1178         int r;
1179
1180         assert(m);
1181         assert(m->rtnl);
1182
1183         r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
1184         if (r < 0)
1185                 return r;
1186
1187         r = sd_netlink_message_request_dump(req, true);
1188         if (r < 0)
1189                 return r;
1190
1191         r = sd_netlink_call(m->rtnl, req, 0, &reply);
1192         if (r < 0)
1193                 return r;
1194
1195         for (link = reply; link; link = sd_netlink_message_next(link)) {
1196                 int k;
1197
1198                 m->enumerating = true;
1199
1200                 k = manager_rtnl_process_link(m->rtnl, link, m);
1201                 if (k < 0)
1202                         r = k;
1203
1204                 m->enumerating = false;
1205         }
1206
1207         return r;
1208 }
1209
1210 int manager_rtnl_enumerate_addresses(Manager *m) {
1211         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
1212         sd_netlink_message *addr;
1213         int r;
1214
1215         assert(m);
1216         assert(m->rtnl);
1217
1218         r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, 0);
1219         if (r < 0)
1220                 return r;
1221
1222         r = sd_netlink_message_request_dump(req, true);
1223         if (r < 0)
1224                 return r;
1225
1226         r = sd_netlink_call(m->rtnl, req, 0, &reply);
1227         if (r < 0)
1228                 return r;
1229
1230         for (addr = reply; addr; addr = sd_netlink_message_next(addr)) {
1231                 int k;
1232
1233                 m->enumerating = true;
1234
1235                 k = manager_rtnl_process_address(m->rtnl, addr, m);
1236                 if (k < 0)
1237                         r = k;
1238
1239                 m->enumerating = false;
1240         }
1241
1242         return r;
1243 }
1244
1245 int manager_rtnl_enumerate_routes(Manager *m) {
1246         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
1247         sd_netlink_message *route;
1248         int r;
1249
1250         assert(m);
1251         assert(m->rtnl);
1252
1253         r = sd_rtnl_message_new_route(m->rtnl, &req, RTM_GETROUTE, 0, 0);
1254         if (r < 0)
1255                 return r;
1256
1257         r = sd_netlink_message_request_dump(req, true);
1258         if (r < 0)
1259                 return r;
1260
1261         r = sd_netlink_call(m->rtnl, req, 0, &reply);
1262         if (r < 0)
1263                 return r;
1264
1265         for (route = reply; route; route = sd_netlink_message_next(route)) {
1266                 int k;
1267
1268                 m->enumerating = true;
1269
1270                 k = manager_rtnl_process_route(m->rtnl, route, m);
1271                 if (k < 0)
1272                         r = k;
1273
1274                 m->enumerating = false;
1275         }
1276
1277         return r;
1278 }
1279
1280 int manager_address_pool_acquire(Manager *m, int family, unsigned prefixlen, union in_addr_union *found) {
1281         AddressPool *p;
1282         int r;
1283
1284         assert(m);
1285         assert(prefixlen > 0);
1286         assert(found);
1287
1288         LIST_FOREACH(address_pools, p, m->address_pools) {
1289                 if (p->family != family)
1290                         continue;
1291
1292                 r = address_pool_acquire(p, prefixlen, found);
1293                 if (r != 0)
1294                         return r;
1295         }
1296
1297         return 0;
1298 }
1299
1300 Link* manager_find_uplink(Manager *m, Link *exclude) {
1301         _cleanup_free_ struct local_address *gateways = NULL;
1302         int n, i;
1303
1304         assert(m);
1305
1306         /* Looks for a suitable "uplink", via black magic: an
1307          * interface that is up and where the default route with the
1308          * highest priority points to. */
1309
1310         n = local_gateways(m->rtnl, 0, AF_UNSPEC, &gateways);
1311         if (n < 0) {
1312                 log_warning_errno(n, "Failed to determine list of default gateways: %m");
1313                 return NULL;
1314         }
1315
1316         for (i = 0; i < n; i++) {
1317                 Link *link;
1318
1319                 link = hashmap_get(m->links, INT_TO_PTR(gateways[i].ifindex));
1320                 if (!link) {
1321                         log_debug("Weird, found a gateway for a link we don't know. Ignoring.");
1322                         continue;
1323                 }
1324
1325                 if (link == exclude)
1326                         continue;
1327
1328                 if (link->operstate < LINK_OPERSTATE_ROUTABLE)
1329                         continue;
1330
1331                 return link;
1332         }
1333
1334         return NULL;
1335 }
1336
1337 void manager_dirty(Manager *manager) {
1338         assert(manager);
1339
1340         /* the serialized state in /run is no longer up-to-date */
1341         manager->dirty = true;
1342 }
1343
1344 static int set_hostname_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
1345         Manager *manager = userdata;
1346         const sd_bus_error *e;
1347
1348         assert(m);
1349         assert(manager);
1350
1351         e = sd_bus_message_get_error(m);
1352         if (e)
1353                 log_warning_errno(sd_bus_error_get_errno(e), "Could not set hostname: %s", e->message);
1354
1355         return 1;
1356 }
1357
1358 int manager_set_hostname(Manager *m, const char *hostname) {
1359         int r;
1360
1361         log_debug("Setting transient hostname: '%s'", strna(hostname));
1362         if (free_and_strdup(&m->dynamic_hostname, hostname) < 0)
1363                 return log_oom();
1364
1365         if (!m->bus) {
1366                 /* TODO: replace by assert when we can rely on kdbus */
1367                 log_info("Not connected to system bus, ignoring transient hostname.");
1368                 return 0;
1369         }
1370
1371         r = sd_bus_call_method_async(
1372                         m->bus,
1373                         NULL,
1374                         "org.freedesktop.hostname1",
1375                         "/org/freedesktop/hostname1",
1376                         "org.freedesktop.hostname1",
1377                         "SetHostname",
1378                         set_hostname_handler,
1379                         m,
1380                         "sb",
1381                         hostname,
1382                         false);
1383
1384         if (r < 0)
1385                 return log_error_errno(r, "Could not set transient hostname: %m");
1386
1387         return 0;
1388 }
1389
1390 static int set_timezone_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
1391         Manager *manager = userdata;
1392         const sd_bus_error *e;
1393
1394         assert(m);
1395         assert(manager);
1396
1397         e = sd_bus_message_get_error(m);
1398         if (e)
1399                 log_warning_errno(sd_bus_error_get_errno(e), "Could not set timezone: %s", e->message);
1400
1401         return 1;
1402 }
1403
1404 int manager_set_timezone(Manager *m, const char *tz) {
1405         int r;
1406
1407         assert(m);
1408         assert(tz);
1409
1410         log_debug("Setting system timezone: '%s'", tz);
1411         if (free_and_strdup(&m->dynamic_timezone, tz) < 0)
1412                 return log_oom();
1413
1414         if (!m->bus) {
1415                 log_info("Not connected to system bus, ignoring timezone.");
1416                 return 0;
1417         }
1418
1419         r = sd_bus_call_method_async(
1420                         m->bus,
1421                         NULL,
1422                         "org.freedesktop.timedate1",
1423                         "/org/freedesktop/timedate1",
1424                         "org.freedesktop.timedate1",
1425                         "SetTimezone",
1426                         set_timezone_handler,
1427                         m,
1428                         "sb",
1429                         tz,
1430                         false);
1431         if (r < 0)
1432                 return log_error_errno(r, "Could not set timezone: %m");
1433
1434         return 0;
1435 }