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 == -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        /* Did we get a timezone or transient hostname from DHCP while D-Bus wasn't up yet? */
 196         if (m->dynamic_hostname) {
 197                 r = manager_set_hostname(m, m->dynamic_hostname);
 198                 if (r < 0)
 199                         return r;
 200         }
 201         if (m->dynamic_timezone) {
 202                 r = manager_set_timezone(m, m->dynamic_timezone);
 203                 if (r < 0)
 204                         return r;
 205         }
 206
 207         return 0;
 208 }
 209
 210 static int manager_udev_process_link(Manager *m, struct udev_device *device) {
 211         Link *link = NULL;
 212         int r, ifindex;
 213
 214         assert(m);
 215         assert(device);
 216
 217         if (!streq_ptr(udev_device_get_action(device), "add"))
 218                 return 0;
 219
 220         ifindex = udev_device_get_ifindex(device);
 221         if (ifindex <= 0) {
 222                 log_debug("Ignoring udev ADD event for device with invalid ifindex");
 223                 return 0;
 224         }
 225
 226         r = link_get(m, ifindex, &link);
 227         if (r == -ENODEV)
 228                 return 0;
 229         else if (r < 0)
 230                 return r;
 231
 232         r = link_initialized(link, device);
 233         if (r < 0)
 234                 return r;
 235
 236         return 0;
 237 }
 238
 239 static int manager_dispatch_link_udev(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
 240         Manager *m = userdata;
 241         struct udev_monitor *monitor = m->udev_monitor;
 242         _cleanup_udev_device_unref_ struct udev_device *device = NULL;
 243
 244         device = udev_monitor_receive_device(monitor);
 245         if (!device)
 246                 return -ENOMEM;
 247
 248         manager_udev_process_link(m, device);
 249         return 0;
 250 }
 251
 252 static int manager_connect_udev(Manager *m) {
 253         int r;
 254
 255         /* udev does not initialize devices inside containers,
 256          * so we rely on them being already initialized before
 257          * entering the container */
 258         if (detect_container() > 0)
 259                 return 0;
 260
 261         m->udev = udev_new();
 262         if (!m->udev)
 263                 return -ENOMEM;
 264
 265         m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
 266         if (!m->udev_monitor)
 267                 return -ENOMEM;
 268
 269         r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "net", NULL);
 270         if (r < 0)
 271                 return log_error_errno(r, "Could not add udev monitor filter: %m");
 272
 273         r = udev_monitor_enable_receiving(m->udev_monitor);
 274         if (r < 0) {
 275                 log_error("Could not enable udev monitor");
 276                 return r;
 277         }
 278
 279         r = sd_event_add_io(m->event,
 280                         &m->udev_event_source,
 281                         udev_monitor_get_fd(m->udev_monitor),
 282                         EPOLLIN, manager_dispatch_link_udev,
 283                         m);
 284         if (r < 0)
 285                 return r;
 286
 287         r = sd_event_source_set_description(m->udev_event_source, "networkd-udev");
 288         if (r < 0)
 289                 return r;
 290
 291         return 0;
 292 }
 293
 294 int manager_rtnl_process_route(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) {
 295         Manager *m = userdata;
 296         Link *link = NULL;
 297         uint16_t type;
 298         uint32_t ifindex, priority = 0;
 299         unsigned char protocol, scope, tos, table;
 300         int family;
 301         unsigned char dst_prefixlen, src_prefixlen;
 302         union in_addr_union dst = {}, gw = {}, src = {}, prefsrc = {};
 303         Route *route = NULL;
 304         int r;
 305
 306         assert(rtnl);
 307         assert(message);
 308         assert(m);
 309
 310         if (sd_netlink_message_is_error(message)) {
 311                 r = sd_netlink_message_get_errno(message);
 312                 if (r < 0)
 313                         log_warning_errno(r, "rtnl: failed to receive route: %m");
 314
 315                 return 0;
 316         }
 317
 318         r = sd_netlink_message_get_type(message, &type);
 319         if (r < 0) {
 320                 log_warning_errno(r, "rtnl: could not get message type: %m");
 321                 return 0;
 322         } else if (type != RTM_NEWROUTE && type != RTM_DELROUTE) {
 323                 log_warning("rtnl: received unexpected message type when processing route");
 324                 return 0;
 325         }
 326
 327         r = sd_netlink_message_read_u32(message, RTA_OIF, &ifindex);
 328         if (r == -ENODATA) {
 329                 log_debug("rtnl: received route without ifindex, ignoring");
 330                 return 0;
 331         } else if (r < 0) {
 332                 log_warning_errno(r, "rtnl: could not get ifindex from route, ignoring: %m");
 333                 return 0;
 334         } else if (ifindex <= 0) {
 335                 log_warning("rtnl: received route message with invalid ifindex, ignoring: %d", ifindex);
 336                 return 0;
 337         } else {
 338                 r = link_get(m, ifindex, &link);
 339                 if (r < 0 || !link) {
 340                         /* when enumerating we might be out of sync, but we will
 341                          * get the route again, so just ignore it */
 342                         if (!m->enumerating)
 343                                 log_warning("rtnl: received route for nonexistent link (%d), ignoring", ifindex);
 344                         return 0;
 345                 }
 346         }
 347
 348         r = sd_rtnl_message_route_get_family(message, &family);
 349         if (r < 0 || !IN_SET(family, AF_INET, AF_INET6)) {
 350                 log_link_warning(link, "rtnl: received address with invalid family, ignoring.");
 351                 return 0;
 352         }
 353
 354         r = sd_rtnl_message_route_get_protocol(message, &protocol);
 355         if (r < 0) {
 356                 log_warning_errno(r, "rtnl: could not get route protocol: %m");
 357                 return 0;
 358         }
 359
 360         switch (family) {
 361         case AF_INET:
 362                 r = sd_netlink_message_read_in_addr(message, RTA_DST, &dst.in);
 363                 if (r < 0 && r != -ENODATA) {
 364                         log_link_warning_errno(link, r, "rtnl: received route without valid destination, ignoring: %m");
 365                         return 0;
 366                 }
 367
 368                 r = sd_netlink_message_read_in_addr(message, RTA_GATEWAY, &gw.in);
 369                 if (r < 0 && r != -ENODATA) {
 370                         log_link_warning_errno(link, r, "rtnl: received route with invalid gateway, ignoring: %m");
 371                         return 0;
 372                 }
 373
 374                 r = sd_netlink_message_read_in_addr(message, RTA_SRC, &src.in);
 375                 if (r < 0 && r != -ENODATA) {
 376                         log_link_warning_errno(link, r, "rtnl: received route with invalid source, ignoring: %m");
 377                         return 0;
 378                 }
 379
 380                 r = sd_netlink_message_read_in_addr(message, RTA_PREFSRC, &prefsrc.in);
 381                 if (r < 0 && r != -ENODATA) {
 382                         log_link_warning_errno(link, r, "rtnl: received route with invalid preferred source, ignoring: %m");
 383                         return 0;
 384                 }
 385
 386                 break;
 387
 388         case AF_INET6:
 389                 r = sd_netlink_message_read_in6_addr(message, RTA_DST, &dst.in6);
 390                 if (r < 0 && r != -ENODATA) {
 391                         log_link_warning_errno(link, r, "rtnl: received route without valid destination, ignoring: %m");
 392                         return 0;
 393                 }
 394
 395                 r = sd_netlink_message_read_in6_addr(message, RTA_GATEWAY, &gw.in6);
 396                 if (r < 0 && r != -ENODATA) {
 397                         log_link_warning_errno(link, r, "rtnl: received route with invalid gateway, ignoring: %m");
 398                         return 0;
 399                 }
 400
 401                 r = sd_netlink_message_read_in6_addr(message, RTA_SRC, &src.in6);
 402                 if (r < 0 && r != -ENODATA) {
 403                         log_link_warning_errno(link, r, "rtnl: received route with invalid source, ignoring: %m");
 404                         return 0;
 405                 }
 406
 407                 r = sd_netlink_message_read_in6_addr(message, RTA_PREFSRC, &prefsrc.in6);
 408                 if (r < 0 && r != -ENODATA) {
 409                         log_link_warning_errno(link, r, "rtnl: received route with invalid preferred source, ignoring: %m");
 410                         return 0;
 411                 }
 412
 413                 break;
 414
 415         default:
 416                 log_link_debug(link, "rtnl: ignoring unsupported address family: %d", family);
 417                 return 0;
 418         }
 419
 420         r = sd_rtnl_message_route_get_dst_prefixlen(message, &dst_prefixlen);
 421         if (r < 0) {
 422                 log_link_warning_errno(link, r, "rtnl: received route with invalid destination prefixlen, ignoring: %m");
 423                 return 0;
 424         }
 425
 426         r = sd_rtnl_message_route_get_src_prefixlen(message, &src_prefixlen);
 427         if (r < 0) {
 428                 log_link_warning_errno(link, r, "rtnl: received route with invalid source prefixlen, ignoring: %m");
 429                 return 0;
 430         }
 431
 432         r = sd_rtnl_message_route_get_scope(message, &scope);
 433         if (r < 0) {
 434                 log_link_warning_errno(link, r, "rtnl: received route with invalid scope, ignoring: %m");
 435                 return 0;
 436         }
 437
 438         r = sd_rtnl_message_route_get_tos(message, &tos);
 439         if (r < 0) {
 440                 log_link_warning_errno(link, r, "rtnl: received route with invalid tos, ignoring: %m");
 441                 return 0;
 442         }
 443
 444         r = sd_rtnl_message_route_get_table(message, &table);
 445         if (r < 0) {
 446                 log_link_warning_errno(link, r, "rtnl: received route with invalid table, ignoring: %m");
 447                 return 0;
 448         }
 449
 450         r = sd_netlink_message_read_u32(message, RTA_PRIORITY, &priority);
 451         if (r < 0 && r != -ENODATA) {
 452                 log_link_warning_errno(link, r, "rtnl: received route with invalid priority, ignoring: %m");
 453                 return 0;
 454         }
 455
 456         route_get(link, family, &dst, dst_prefixlen, tos, priority, table, &route);
 457
 458         switch (type) {
 459         case RTM_NEWROUTE:
 460                 if (!route) {
 461                         /* A route appeared that we did not request */
 462                         r = route_add_foreign(link, family, &dst, dst_prefixlen, tos, priority, table, &route);
 463                         if (r < 0)
 464                                 return 0;
 465                 }
 466
 467                 route_update(route, &src, src_prefixlen, &gw, &prefsrc, scope, protocol);
 468
 469                 break;
 470
 471         case RTM_DELROUTE:
 472                 route_free(route);
 473                 break;
 474
 475         default:
 476                 assert_not_reached("Received invalid RTNL message type");
 477         }
 478
 479         return 1;
 480 }
 481
 482 int manager_rtnl_process_address(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) {
 483         Manager *m = userdata;
 484         Link *link = NULL;
 485         uint16_t type;
 486         unsigned char flags;
 487         int family;
 488         unsigned char prefixlen;
 489         unsigned char scope;
 490         union in_addr_union in_addr;
 491         struct ifa_cacheinfo cinfo;
 492         Address *address = NULL;
 493         char buf[INET6_ADDRSTRLEN], valid_buf[FORMAT_TIMESPAN_MAX];
 494         const char *valid_str = NULL;
 495         int r, ifindex;
 496
 497         assert(rtnl);
 498         assert(message);
 499         assert(m);
 500
 501         if (sd_netlink_message_is_error(message)) {
 502                 r = sd_netlink_message_get_errno(message);
 503                 if (r < 0)
 504                         log_warning_errno(r, "rtnl: failed to receive address: %m");
 505
 506                 return 0;
 507         }
 508
 509         r = sd_netlink_message_get_type(message, &type);
 510         if (r < 0) {
 511                 log_warning_errno(r, "rtnl: could not get message type: %m");
 512                 return 0;
 513         } else if (type != RTM_NEWADDR && type != RTM_DELADDR) {
 514                 log_warning("rtnl: received unexpected message type when processing address");
 515                 return 0;
 516         }
 517
 518         r = sd_rtnl_message_addr_get_ifindex(message, &ifindex);
 519         if (r < 0) {
 520                 log_warning_errno(r, "rtnl: could not get ifindex from address: %m");
 521                 return 0;
 522         } else if (ifindex <= 0) {
 523                 log_warning("rtnl: received address message with invalid ifindex: %d", ifindex);
 524                 return 0;
 525         } else {
 526                 r = link_get(m, ifindex, &link);
 527                 if (r < 0 || !link) {
 528                         /* when enumerating we might be out of sync, but we will
 529                          * get the address again, so just ignore it */
 530                         if (!m->enumerating)
 531                                 log_warning("rtnl: received address for nonexistent link (%d), ignoring", ifindex);
 532                         return 0;
 533                 }
 534         }
 535
 536         r = sd_rtnl_message_addr_get_family(message, &family);
 537         if (r < 0 || !IN_SET(family, AF_INET, AF_INET6)) {
 538                 log_link_warning(link, "rtnl: received address with invalid family, ignoring.");
 539                 return 0;
 540         }
 541
 542         r = sd_rtnl_message_addr_get_prefixlen(message, &prefixlen);
 543         if (r < 0) {
 544                 log_link_warning_errno(link, r, "rtnl: received address with invalid prefixlen, ignoring: %m");
 545                 return 0;
 546         }
 547
 548         r = sd_rtnl_message_addr_get_scope(message, &scope);
 549         if (r < 0) {
 550                 log_link_warning_errno(link, r, "rtnl: received address with invalid scope, ignoring: %m");
 551                 return 0;
 552         }
 553
 554         r = sd_rtnl_message_addr_get_flags(message, &flags);
 555         if (r < 0) {
 556                 log_link_warning_errno(link, r, "rtnl: received address with invalid flags, ignoring: %m");
 557                 return 0;
 558         }
 559
 560         switch (family) {
 561         case AF_INET:
 562                 r = sd_netlink_message_read_in_addr(message, IFA_LOCAL, &in_addr.in);
 563                 if (r < 0) {
 564                         log_link_warning_errno(link, r, "rtnl: received address without valid address, ignoring: %m");
 565                         return 0;
 566                 }
 567
 568                 break;
 569
 570         case AF_INET6:
 571                 r = sd_netlink_message_read_in6_addr(message, IFA_ADDRESS, &in_addr.in6);
 572                 if (r < 0) {
 573                         log_link_warning_errno(link, r, "rtnl: received address without valid address, ignoring: %m");
 574                         return 0;
 575                 }
 576
 577                 break;
 578
 579         default:
 580                 log_link_debug(link, "rtnl: ignoring unsupported address family: %d", family);
 581         }
 582
 583         if (!inet_ntop(family, &in_addr, buf, INET6_ADDRSTRLEN)) {
 584                 log_link_warning(link, "Could not print address");
 585                 return 0;
 586         }
 587
 588         r = sd_netlink_message_read_cache_info(message, IFA_CACHEINFO, &cinfo);
 589         if (r >= 0) {
 590                 if (cinfo.ifa_valid != CACHE_INFO_INFINITY_LIFE_TIME)
 591                         valid_str = format_timespan(valid_buf, FORMAT_TIMESPAN_MAX,
 592                                                     cinfo.ifa_valid * USEC_PER_SEC,
 593                                                     USEC_PER_SEC);
 594         }
 595
 596         address_get(link, family, &in_addr, prefixlen, &address);
 597
 598         switch (type) {
 599         case RTM_NEWADDR:
 600                 if (address)
 601                         log_link_debug(link, "Updating address: %s/%u (valid %s%s)", buf, prefixlen,
 602                                        valid_str ? "for " : "forever", valid_str ?: "");
 603                 else {
 604                         /* An address appeared that we did not request */
 605                         r = address_add_foreign(link, family, &in_addr, prefixlen, &address);
 606                         if (r < 0) {
 607                                 log_link_warning_errno(link, r, "Failed to add address %s/%u: %m", buf, prefixlen);
 608                                 return 0;
 609                         } else
 610                                 log_link_debug(link, "Adding address: %s/%u (valid %s%s)", buf, prefixlen,
 611                                                valid_str ? "for " : "forever", valid_str ?: "");
 612                 }
 613
 614                 address_update(address, flags, scope, &cinfo);
 615
 616                 break;
 617
 618         case RTM_DELADDR:
 619
 620                 if (address) {
 621                         log_link_debug(link, "Removing address: %s/%u (valid %s%s)", buf, prefixlen,
 622                                        valid_str ? "for " : "forever", valid_str ?: "");
 623                         address_drop(address);
 624                 } else
 625                         log_link_warning(link, "Removing non-existent address: %s/%u (valid %s%s)", buf, prefixlen,
 626                                          valid_str ? "for " : "forever", valid_str ?: "");
 627
 628                 break;
 629         default:
 630                 assert_not_reached("Received invalid RTNL message type");
 631         }
 632
 633         return 1;
 634 }
 635
 636 static int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) {
 637         Manager *m = userdata;
 638         Link *link = NULL;
 639         NetDev *netdev = NULL;
 640         uint16_t type;
 641         const char *name;
 642         int r, ifindex;
 643
 644         assert(rtnl);
 645         assert(message);
 646         assert(m);
 647
 648         if (sd_netlink_message_is_error(message)) {
 649                 r = sd_netlink_message_get_errno(message);
 650                 if (r < 0)
 651                         log_warning_errno(r, "rtnl: Could not receive link: %m");
 652
 653                 return 0;
 654         }
 655
 656         r = sd_netlink_message_get_type(message, &type);
 657         if (r < 0) {
 658                 log_warning_errno(r, "rtnl: Could not get message type: %m");
 659                 return 0;
 660         } else if (type != RTM_NEWLINK && type != RTM_DELLINK) {
 661                 log_warning("rtnl: Received unexpected message type when processing link");
 662                 return 0;
 663         }
 664
 665         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 666         if (r < 0) {
 667                 log_warning_errno(r, "rtnl: Could not get ifindex from link: %m");
 668                 return 0;
 669         } else if (ifindex <= 0) {
 670                 log_warning("rtnl: received link message with invalid ifindex: %d", ifindex);
 671                 return 0;
 672         }
 673
 674         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
 675         if (r < 0) {
 676                 log_warning_errno(r, "rtnl: Received link message without ifname: %m");
 677                 return 0;
 678         }
 679
 680         (void) link_get(m, ifindex, &link);
 681         (void) netdev_get(m, name, &netdev);
 682
 683         switch (type) {
 684         case RTM_NEWLINK:
 685                 if (!link) {
 686                         /* link is new, so add it */
 687                         r = link_add(m, message, &link);
 688                         if (r < 0) {
 689                                 log_warning_errno(r, "Could not add new link: %m");
 690                                 return 0;
 691                         }
 692                 }
 693
 694                 if (netdev) {
 695                         /* netdev exists, so make sure the ifindex matches */
 696                         r = netdev_set_ifindex(netdev, message);
 697                         if (r < 0) {
 698                                 log_warning_errno(r, "Could not set ifindex on netdev: %m");
 699                                 return 0;
 700                         }
 701                 }
 702
 703                 r = link_update(link, message);
 704                 if (r < 0)
 705                         return 0;
 706
 707                 break;
 708
 709         case RTM_DELLINK:
 710                 link_drop(link);
 711                 netdev_drop(netdev);
 712
 713                 break;
 714
 715         default:
 716                 assert_not_reached("Received invalid RTNL message type.");
 717         }
 718
 719         return 1;
 720 }
 721
 722 static int systemd_netlink_fd(void) {
 723         int n, fd, rtnl_fd = -EINVAL;
 724
 725         n = sd_listen_fds(true);
 726         if (n <= 0)
 727                 return -EINVAL;
 728
 729         for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd ++) {
 730                 if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1) > 0) {
 731                         if (rtnl_fd >= 0)
 732                                 return -EINVAL;
 733
 734                         rtnl_fd = fd;
 735                 }
 736         }
 737
 738         return rtnl_fd;
 739 }
 740
 741 static int manager_connect_rtnl(Manager *m) {
 742         int fd, r;
 743
 744         assert(m);
 745
 746         fd = systemd_netlink_fd();
 747         if (fd < 0)
 748                 r = sd_netlink_open(&m->rtnl);
 749         else
 750                 r = sd_netlink_open_fd(&m->rtnl, fd);
 751         if (r < 0)
 752                 return r;
 753
 754         r = sd_netlink_inc_rcvbuf(m->rtnl, RCVBUF_SIZE);
 755         if (r < 0)
 756                 return r;
 757
 758         r = sd_netlink_attach_event(m->rtnl, m->event, 0);
 759         if (r < 0)
 760                 return r;
 761
 762         r = sd_netlink_add_match(m->rtnl, RTM_NEWLINK, &manager_rtnl_process_link, m);
 763         if (r < 0)
 764                 return r;
 765
 766         r = sd_netlink_add_match(m->rtnl, RTM_DELLINK, &manager_rtnl_process_link, m);
 767         if (r < 0)
 768                 return r;
 769
 770         r = sd_netlink_add_match(m->rtnl, RTM_NEWADDR, &manager_rtnl_process_address, m);
 771         if (r < 0)
 772                 return r;
 773
 774         r = sd_netlink_add_match(m->rtnl, RTM_DELADDR, &manager_rtnl_process_address, m);
 775         if (r < 0)
 776                 return r;
 777
 778         r = sd_netlink_add_match(m->rtnl, RTM_NEWROUTE, &manager_rtnl_process_route, m);
 779         if (r < 0)
 780                 return r;
 781
 782         r = sd_netlink_add_match(m->rtnl, RTM_DELROUTE, &manager_rtnl_process_route, m);
 783         if (r < 0)
 784                 return r;
 785
 786         return 0;
 787 }
 788
 789 static int ordered_set_put_in_addr_data(OrderedSet *s, const struct in_addr_data *address) {
 790         char *p;
 791         int r;
 792
 793         assert(s);
 794         assert(address);
 795
 796         r = in_addr_to_string(address->family, &address->address, &p);
 797         if (r < 0)
 798                 return r;
 799
 800         r = ordered_set_consume(s, p);
 801         if (r == -EEXIST)
 802                 return 0;
 803
 804         return r;
 805 }
 806
 807 static int ordered_set_put_in_addr_datav(OrderedSet *s, const struct in_addr_data *addresses, unsigned n) {
 808         int r, c = 0;
 809         unsigned i;
 810
 811         assert(s);
 812         assert(addresses || n == 0);
 813
 814         for (i = 0; i < n; i++) {
 815                 r = ordered_set_put_in_addr_data(s, addresses+i);
 816                 if (r < 0)
 817                         return r;
 818
 819                 c += r;
 820         }
 821
 822         return c;
 823 }
 824
 825 static int ordered_set_put_in4_addr(OrderedSet *s, const struct in_addr *address) {
 826         char *p;
 827         int r;
 828
 829         assert(s);
 830         assert(address);
 831
 832         r = in_addr_to_string(AF_INET, (const union in_addr_union*) address, &p);
 833         if (r < 0)
 834                 return r;
 835
 836         r = ordered_set_consume(s, p);
 837         if (r == -EEXIST)
 838                 return 0;
 839
 840         return r;
 841 }
 842
 843 static int ordered_set_put_in4_addrv(OrderedSet *s, const struct in_addr *addresses, unsigned n) {
 844         int r, c = 0;
 845         unsigned i;
 846
 847         assert(s);
 848         assert(n == 0 || addresses);
 849
 850         for (i = 0; i < n; i++) {
 851                 r = ordered_set_put_in4_addr(s, addresses+i);
 852                 if (r < 0)
 853                         return r;
 854
 855                 c += r;
 856         }
 857
 858         return c;
 859 }
 860
 861 static void print_string_set(FILE *f, const char *field, OrderedSet *s) {
 862         bool space = false;
 863         Iterator i;
 864         char *p;
 865
 866         if (ordered_set_isempty(s))
 867                 return;
 868
 869         fputs_unlocked(field, f);
 870
 871         ORDERED_SET_FOREACH(p, s, i)
 872                 fputs_with_space(f, p, NULL, &space);
 873
 874         fputc_unlocked('\n', f);
 875 }
 876
 877 static int manager_save(Manager *m) {
 878         _cleanup_ordered_set_free_free_ OrderedSet *dns = NULL, *ntp = NULL, *search_domains = NULL, *route_domains = NULL;
 879         Link *link;
 880         Iterator i;
 881         _cleanup_free_ char *temp_path = NULL;
 882         _cleanup_fclose_ FILE *f = NULL;
 883         LinkOperationalState operstate = LINK_OPERSTATE_OFF;
 884         const char *operstate_str;
 885         int r;
 886
 887         assert(m);
 888         assert(m->state_file);
 889
 890         /* We add all NTP and DNS server to a set, to filter out duplicates */
 891         dns = ordered_set_new(&string_hash_ops);
 892         if (!dns)
 893                 return -ENOMEM;
 894
 895         ntp = ordered_set_new(&string_hash_ops);
 896         if (!ntp)
 897                 return -ENOMEM;
 898
 899         search_domains = ordered_set_new(&dns_name_hash_ops);
 900         if (!search_domains)
 901                 return -ENOMEM;
 902
 903         route_domains = ordered_set_new(&dns_name_hash_ops);
 904         if (!route_domains)
 905                 return -ENOMEM;
 906
 907         HASHMAP_FOREACH(link, m->links, i) {
 908                 if (link->flags & IFF_LOOPBACK)
 909                         continue;
 910
 911                 if (link->operstate > operstate)
 912                         operstate = link->operstate;
 913
 914                 if (!link->network)
 915                         continue;
 916
 917                 /* First add the static configured entries */
 918                 r = ordered_set_put_in_addr_datav(dns, link->network->dns, link->network->n_dns);
 919                 if (r < 0)
 920                         return r;
 921
 922                 r = ordered_set_put_strdupv(ntp, link->network->ntp);
 923                 if (r < 0)
 924                         return r;
 925
 926                 r = ordered_set_put_strdupv(search_domains, link->network->search_domains);
 927                 if (r < 0)
 928                         return r;
 929
 930                 r = ordered_set_put_strdupv(route_domains, link->network->route_domains);
 931                 if (r < 0)
 932                         return r;
 933
 934                 if (!link->dhcp_lease)
 935                         continue;
 936
 937                 /* Secondly, add the entries acquired via DHCP */
 938                 if (link->network->dhcp_use_dns) {
 939                         const struct in_addr *addresses;
 940
 941                         r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
 942                         if (r > 0) {
 943                                 r = ordered_set_put_in4_addrv(dns, addresses, r);
 944                                 if (r < 0)
 945                                         return r;
 946                         } else if (r < 0 && r != -ENODATA)
 947                                 return r;
 948                 }
 949
 950                 if (link->network->dhcp_use_ntp) {
 951                         const struct in_addr *addresses;
 952
 953                         r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
 954                         if (r > 0) {
 955                                 r = ordered_set_put_in4_addrv(ntp, addresses, r);
 956                                 if (r < 0)
 957                                         return r;
 958                         } else if (r < 0 && r != -ENODATA)
 959                                 return r;
 960                 }
 961
 962                 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
 963                         const char *domainname;
 964                         char **domains = NULL;
 965
 966                         OrderedSet *target_domains = (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) ? search_domains : route_domains;
 967                         r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname);
 968                         if (r >= 0) {
 969                                 r = ordered_set_put_strdup(target_domains, domainname);
 970                                 if (r < 0)
 971                                         return r;
 972                         } else if (r != -ENODATA)
 973                                 return r;
 974
 975                         r = sd_dhcp_lease_get_search_domains(link->dhcp_lease, &domains);
 976                         if (r >= 0) {
 977                                 r = ordered_set_put_strdupv(target_domains, domains);
 978                                 if (r < 0)
 979                                         return r;
 980                         } else if (r != -ENODATA)
 981                                 return r;
 982                 }
 983         }
 984
 985         operstate_str = link_operstate_to_string(operstate);
 986         assert(operstate_str);
 987
 988         r = fopen_temporary(m->state_file, &f, &temp_path);
 989         if (r < 0)
 990                 return r;
 991
 992         (void) fchmod(fileno(f), 0644);
 993
 994         fprintf(f,
 995                 "# This is private data. Do not parse.\n"
 996                 "OPER_STATE=%s\n", operstate_str);
 997
 998         print_string_set(f, "DNS=", dns);
 999         print_string_set(f, "NTP=", ntp);
1000         print_string_set(f, "DOMAINS=", search_domains);
1001         print_string_set(f, "ROUTE_DOMAINS=", route_domains);
1002
1003         r = fflush_and_check(f);
1004         if (r < 0)
1005                 goto fail;
1006
1007         if (rename(temp_path, m->state_file) < 0) {
1008                 r = -errno;
1009                 goto fail;
1010         }
1011
1012         if (m->operational_state != operstate) {
1013                 m->operational_state = operstate;
1014                 r = manager_send_changed(m, "OperationalState", NULL);
1015                 if (r < 0)
1016                         log_error_errno(r, "Could not emit changed OperationalState: %m");
1017         }
1018
1019         m->dirty = false;
1020
1021         return 0;
1022
1023 fail:
1024         (void) unlink(m->state_file);
1025         (void) unlink(temp_path);
1026
1027         return log_error_errno(r, "Failed to save network state to %s: %m", m->state_file);
1028 }
1029
1030 static int manager_dirty_handler(sd_event_source *s, void *userdata) {
1031         Manager *m = userdata;
1032         Link *link;
1033         Iterator i;
1034         int r;
1035
1036         assert(m);
1037
1038         if (m->dirty)
1039                 manager_save(m);
1040
1041         SET_FOREACH(link, m->dirty_links, i) {
1042                 r = link_save(link);
1043                 if (r >= 0)
1044                         link_clean(link);
1045         }
1046
1047         return 1;
1048 }
1049
1050 int manager_new(Manager **ret, sd_event *event) {
1051         _cleanup_manager_free_ Manager *m = NULL;
1052         int r;
1053
1054         m = new0(Manager, 1);
1055         if (!m)
1056                 return -ENOMEM;
1057
1058         m->state_file = strdup("/run/systemd/netif/state");
1059         if (!m->state_file)
1060                 return -ENOMEM;
1061
1062         m->event = sd_event_ref(event);
1063
1064         r = sd_event_add_post(m->event, NULL, manager_dirty_handler, m);
1065         if (r < 0)
1066                 return r;
1067
1068         r = manager_connect_rtnl(m);
1069         if (r < 0)
1070                 return r;
1071
1072         r = manager_connect_udev(m);
1073         if (r < 0)
1074                 return r;
1075
1076         m->netdevs = hashmap_new(&string_hash_ops);
1077         if (!m->netdevs)
1078                 return -ENOMEM;
1079
1080         LIST_HEAD_INIT(m->networks);
1081
1082         r = setup_default_address_pool(m);
1083         if (r < 0)
1084                 return r;
1085
1086         m->duid.type = DUID_TYPE_EN;
1087
1088         *ret = m;
1089         m = NULL;
1090
1091         return 0;
1092 }
1093
1094 void manager_free(Manager *m) {
1095         Network *network;
1096         NetDev *netdev;
1097         Link *link;
1098         AddressPool *pool;
1099
1100         if (!m)
1101                 return;
1102
1103         free(m->state_file);
1104
1105         while ((link = hashmap_first(m->links)))
1106                 link_unref(link);
1107         hashmap_free(m->links);
1108
1109         while ((network = m->networks))
1110                 network_free(network);
1111
1112         hashmap_free(m->networks_by_name);
1113
1114         while ((netdev = hashmap_first(m->netdevs)))
1115                 netdev_unref(netdev);
1116         hashmap_free(m->netdevs);
1117
1118         while ((pool = m->address_pools))
1119                 address_pool_free(pool);
1120
1121         sd_netlink_unref(m->rtnl);
1122         sd_event_unref(m->event);
1123
1124         sd_event_source_unref(m->udev_event_source);
1125         udev_monitor_unref(m->udev_monitor);
1126         udev_unref(m->udev);
1127
1128         sd_bus_unref(m->bus);
1129         sd_bus_slot_unref(m->prepare_for_sleep_slot);
1130         sd_event_source_unref(m->bus_retry_event_source);
1131
1132         free(m->dynamic_timezone);
1133         free(m->dynamic_hostname);
1134
1135         free(m);
1136 }
1137
1138 int manager_start(Manager *m) {
1139         Link *link;
1140         Iterator i;
1141
1142         assert(m);
1143
1144         /* The dirty handler will deal with future serialization, but the first one
1145            must be done explicitly. */
1146
1147         manager_save(m);
1148
1149         HASHMAP_FOREACH(link, m->links, i)
1150                 link_save(link);
1151
1152         return 0;
1153 }
1154
1155 int manager_load_config(Manager *m) {
1156         int r;
1157
1158         /* update timestamp */
1159         paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, true);
1160
1161         r = netdev_load(m);
1162         if (r < 0)
1163                 return r;
1164
1165         r = network_load(m);
1166         if (r < 0)
1167                 return r;
1168
1169         return 0;
1170 }
1171
1172 bool manager_should_reload(Manager *m) {
1173         return paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, false);
1174 }
1175
1176 int manager_rtnl_enumerate_links(Manager *m) {
1177         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
1178         sd_netlink_message *link;
1179         int r;
1180
1181         assert(m);
1182         assert(m->rtnl);
1183
1184         r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
1185         if (r < 0)
1186                 return r;
1187
1188         r = sd_netlink_message_request_dump(req, true);
1189         if (r < 0)
1190                 return r;
1191
1192         r = sd_netlink_call(m->rtnl, req, 0, &reply);
1193         if (r < 0)
1194                 return r;
1195
1196         for (link = reply; link; link = sd_netlink_message_next(link)) {
1197                 int k;
1198
1199                 m->enumerating = true;
1200
1201                 k = manager_rtnl_process_link(m->rtnl, link, m);
1202                 if (k < 0)
1203                         r = k;
1204
1205                 m->enumerating = false;
1206         }
1207
1208         return r;
1209 }
1210
1211 int manager_rtnl_enumerate_addresses(Manager *m) {
1212         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
1213         sd_netlink_message *addr;
1214         int r;
1215
1216         assert(m);
1217         assert(m->rtnl);
1218
1219         r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, 0);
1220         if (r < 0)
1221                 return r;
1222
1223         r = sd_netlink_message_request_dump(req, true);
1224         if (r < 0)
1225                 return r;
1226
1227         r = sd_netlink_call(m->rtnl, req, 0, &reply);
1228         if (r < 0)
1229                 return r;
1230
1231         for (addr = reply; addr; addr = sd_netlink_message_next(addr)) {
1232                 int k;
1233
1234                 m->enumerating = true;
1235
1236                 k = manager_rtnl_process_address(m->rtnl, addr, m);
1237                 if (k < 0)
1238                         r = k;
1239
1240                 m->enumerating = false;
1241         }
1242
1243         return r;
1244 }
1245
1246 int manager_rtnl_enumerate_routes(Manager *m) {
1247         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
1248         sd_netlink_message *route;
1249         int r;
1250
1251         assert(m);
1252         assert(m->rtnl);
1253
1254         r = sd_rtnl_message_new_route(m->rtnl, &req, RTM_GETROUTE, 0, 0);
1255         if (r < 0)
1256                 return r;
1257
1258         r = sd_netlink_message_request_dump(req, true);
1259         if (r < 0)
1260                 return r;
1261
1262         r = sd_netlink_call(m->rtnl, req, 0, &reply);
1263         if (r < 0)
1264                 return r;
1265
1266         for (route = reply; route; route = sd_netlink_message_next(route)) {
1267                 int k;
1268
1269                 m->enumerating = true;
1270
1271                 k = manager_rtnl_process_route(m->rtnl, route, m);
1272                 if (k < 0)
1273                         r = k;
1274
1275                 m->enumerating = false;
1276         }
1277
1278         return r;
1279 }
1280
1281 int manager_address_pool_acquire(Manager *m, int family, unsigned prefixlen, union in_addr_union *found) {
1282         AddressPool *p;
1283         int r;
1284
1285         assert(m);
1286         assert(prefixlen > 0);
1287         assert(found);
1288
1289         LIST_FOREACH(address_pools, p, m->address_pools) {
1290                 if (p->family != family)
1291                         continue;
1292
1293                 r = address_pool_acquire(p, prefixlen, found);
1294                 if (r != 0)
1295                         return r;
1296         }
1297
1298         return 0;
1299 }
1300
1301 Link* manager_find_uplink(Manager *m, Link *exclude) {
1302         _cleanup_free_ struct local_address *gateways = NULL;
1303         int n, i;
1304
1305         assert(m);
1306
1307         /* Looks for a suitable "uplink", via black magic: an
1308          * interface that is up and where the default route with the
1309          * highest priority points to. */
1310
1311         n = local_gateways(m->rtnl, 0, AF_UNSPEC, &gateways);
1312         if (n < 0) {
1313                 log_warning_errno(n, "Failed to determine list of default gateways: %m");
1314                 return NULL;
1315         }
1316
1317         for (i = 0; i < n; i++) {
1318                 Link *link;
1319
1320                 link = hashmap_get(m->links, INT_TO_PTR(gateways[i].ifindex));
1321                 if (!link) {
1322                         log_debug("Weird, found a gateway for a link we don't know. Ignoring.");
1323                         continue;
1324                 }
1325
1326                 if (link == exclude)
1327                         continue;
1328
1329                 if (link->operstate < LINK_OPERSTATE_ROUTABLE)
1330                         continue;
1331
1332                 return link;
1333         }
1334
1335         return NULL;
1336 }
1337
1338 void manager_dirty(Manager *manager) {
1339         assert(manager);
1340
1341         /* the serialized state in /run is no longer up-to-date */
1342         manager->dirty = true;
1343 }
1344
1345 static int set_hostname_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
1346         Manager *manager = userdata;
1347         const sd_bus_error *e;
1348
1349         assert(m);
1350         assert(manager);
1351
1352         e = sd_bus_message_get_error(m);
1353         if (e)
1354                 log_warning_errno(sd_bus_error_get_errno(e), "Could not set hostname: %s", e->message);
1355
1356         return 1;
1357 }
1358
1359 int manager_set_hostname(Manager *m, const char *hostname) {
1360         int r;
1361
1362         log_debug("Setting transient hostname: '%s'", strna(hostname));
1363         if (free_and_strdup(&m->dynamic_hostname, hostname) < 0)
1364                 return log_oom();
1365
1366         if (!m->bus) {
1367                 /* TODO: replace by assert when we can rely on kdbus */
1368                 log_info("Not connected to system bus, ignoring transient hostname.");
1369                 return 0;
1370         }
1371
1372         r = sd_bus_call_method_async(
1373                         m->bus,
1374                         NULL,
1375                         "org.freedesktop.hostname1",
1376                         "/org/freedesktop/hostname1",
1377                         "org.freedesktop.hostname1",
1378                         "SetHostname",
1379                         set_hostname_handler,
1380                         m,
1381                         "sb",
1382                         hostname,
1383                         false);
1384
1385         if (r < 0)
1386                 return log_error_errno(r, "Could not set transient hostname: %m");
1387
1388         return 0;
1389 }
1390
1391 static int set_timezone_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
1392         Manager *manager = userdata;
1393         const sd_bus_error *e;
1394
1395         assert(m);
1396         assert(manager);
1397
1398         e = sd_bus_message_get_error(m);
1399         if (e)
1400                 log_warning_errno(sd_bus_error_get_errno(e), "Could not set timezone: %s", e->message);
1401
1402         return 1;
1403 }
1404
1405 int manager_set_timezone(Manager *m, const char *tz) {
1406         int r;
1407
1408         assert(m);
1409         assert(tz);
1410
1411         log_debug("Setting system timezone: '%s'", tz);
1412         if (free_and_strdup(&m->dynamic_timezone, tz) < 0)
1413                 return log_oom();
1414
1415         if (!m->bus) {
1416                 log_info("Not connected to system bus, ignoring timezone.");
1417                 return 0;
1418         }
1419
1420         r = sd_bus_call_method_async(
1421                         m->bus,
1422                         NULL,
1423                         "org.freedesktop.timedate1",
1424                         "/org/freedesktop/timedate1",
1425                         "org.freedesktop.timedate1",
1426                         "SetTimezone",
1427                         set_timezone_handler,
1428                         m,
1429                         "sb",
1430                         tz,
1431                         false);
1432         if (r < 0)
1433                 return log_error_errno(r, "Could not set timezone: %m");
1434
1435         return 0;
1436 }