src/network/networkd-manager.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <netinet/in.h>
   4 #include <sys/socket.h>
   5 #include <unistd.h>
   6 #include <linux/if.h>
   7 #include <linux/fib_rules.h>
   8 #include <linux/nexthop.h>
   9 #include <linux/nl80211.h>
  10
  11 #include "sd-netlink.h"
  12
  13 #include "alloc-util.h"
  14 #include "bus-error.h"
  15 #include "bus-locator.h"
  16 #include "bus-log-control-api.h"
  17 #include "bus-polkit.h"
  18 #include "bus-util.h"
  19 #include "common-signal.h"
  20 #include "conf-parser.h"
  21 #include "constants.h"
  22 #include "daemon-util.h"
  23 #include "device-private.h"
  24 #include "device-util.h"
  25 #include "dns-domain.h"
  26 #include "fd-util.h"
  27 #include "fileio.h"
  28 #include "firewall-util.h"
  29 #include "fs-util.h"
  30 #include "initrd-util.h"
  31 #include "local-addresses.h"
  32 #include "netlink-util.h"
  33 #include "network-internal.h"
  34 #include "networkd-address-pool.h"
  35 #include "networkd-address.h"
  36 #include "networkd-dhcp-server-bus.h"
  37 #include "networkd-dhcp6.h"
  38 #include "networkd-link-bus.h"
  39 #include "networkd-manager.h"
  40 #include "networkd-manager-bus.h"
  41 #include "networkd-manager-varlink.h"
  42 #include "networkd-neighbor.h"
  43 #include "networkd-network-bus.h"
  44 #include "networkd-nexthop.h"
  45 #include "networkd-queue.h"
  46 #include "networkd-route.h"
  47 #include "networkd-routing-policy-rule.h"
  48 #include "networkd-speed-meter.h"
  49 #include "networkd-state-file.h"
  50 #include "networkd-wifi.h"
  51 #include "networkd-wiphy.h"
  52 #include "ordered-set.h"
  53 #include "path-lookup.h"
  54 #include "path-util.h"
  55 #include "qdisc.h"
  56 #include "selinux-util.h"
  57 #include "set.h"
  58 #include "signal-util.h"
  59 #include "stat-util.h"
  60 #include "strv.h"
  61 #include "sysctl-util.h"
  62 #include "tclass.h"
  63 #include "tmpfile-util.h"
  64 #include "tuntap.h"
  65 #include "udev-util.h"
  66
  67 /* use 128 MB for receive socket kernel queue. */
  68 #define RCVBUF_SIZE    (128*1024*1024)
  69
  70 static int match_prepare_for_sleep(sd_bus_message *message, void *userdata, sd_bus_error *ret_error) {
  71         Manager *m = ASSERT_PTR(userdata);
  72         Link *link;
  73         int b, r;
  74
  75         assert(message);
  76
  77         r = sd_bus_message_read(message, "b", &b);
  78         if (r < 0) {
  79                 bus_log_parse_error(r);
  80                 return 0;
  81         }
  82
  83         if (b)
  84                 return 0;
  85
  86         log_debug("Coming back from suspend, reconfiguring all connections...");
  87
  88         HASHMAP_FOREACH(link, m->links_by_index) {
  89                 r = link_reconfigure(link, /* force = */ true);
  90                 if (r < 0) {
  91                         log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
  92                         link_enter_failed(link);
  93                 }
  94         }
  95
  96         return 0;
  97 }
  98
  99 static int on_connected(sd_bus_message *message, void *userdata, sd_bus_error *ret_error) {
 100         Manager *m = ASSERT_PTR(userdata);
 101
 102         assert(message);
 103
 104         /* Did we get a timezone or transient hostname from DHCP while D-Bus wasn't up yet? */
 105         if (m->dynamic_hostname)
 106                 (void) manager_set_hostname(m, m->dynamic_hostname);
 107         if (m->dynamic_timezone)
 108                 (void) manager_set_timezone(m, m->dynamic_timezone);
 109         if (m->product_uuid_requested)
 110                 (void) manager_request_product_uuid(m);
 111
 112         return 0;
 113 }
 114
 115 static int manager_connect_bus(Manager *m) {
 116         int r;
 117
 118         assert(m);
 119         assert(!m->bus);
 120
 121         r = bus_open_system_watch_bind_with_description(&m->bus, "bus-api-network");
 122         if (r < 0)
 123                 return log_error_errno(r, "Failed to connect to bus: %m");
 124
 125         r = bus_add_implementation(m->bus, &manager_object, m);
 126         if (r < 0)
 127                 return r;
 128
 129         r = bus_log_control_api_register(m->bus);
 130         if (r < 0)
 131                 return r;
 132
 133         r = sd_bus_request_name_async(m->bus, NULL, "org.freedesktop.network1", 0, NULL, NULL);
 134         if (r < 0)
 135                 return log_error_errno(r, "Failed to request name: %m");
 136
 137         r = sd_bus_attach_event(m->bus, m->event, 0);
 138         if (r < 0)
 139                 return log_error_errno(r, "Failed to attach bus to event loop: %m");
 140
 141         r = sd_bus_match_signal_async(
 142                         m->bus,
 143                         NULL,
 144                         "org.freedesktop.DBus.Local",
 145                         NULL,
 146                         "org.freedesktop.DBus.Local",
 147                         "Connected",
 148                         on_connected, NULL, m);
 149         if (r < 0)
 150                 return log_error_errno(r, "Failed to request match on Connected signal: %m");
 151
 152         r = bus_match_signal_async(
 153                         m->bus,
 154                         NULL,
 155                         bus_login_mgr,
 156                         "PrepareForSleep",
 157                         match_prepare_for_sleep, NULL, m);
 158         if (r < 0)
 159                 log_warning_errno(r, "Failed to request match for PrepareForSleep, ignoring: %m");
 160
 161         return 0;
 162 }
 163
 164 static int manager_process_uevent(sd_device_monitor *monitor, sd_device *device, void *userdata) {
 165         Manager *m = ASSERT_PTR(userdata);
 166         sd_device_action_t action;
 167         int r;
 168
 169         assert(device);
 170
 171         r = sd_device_get_action(device, &action);
 172         if (r < 0)
 173                 return log_device_warning_errno(device, r, "Failed to get udev action, ignoring: %m");
 174
 175         if (device_in_subsystem(device, "net"))
 176                 r = manager_udev_process_link(m, device, action);
 177         else if (device_in_subsystem(device, "ieee80211"))
 178                 r = manager_udev_process_wiphy(m, device, action);
 179         else if (device_in_subsystem(device, "rfkill"))
 180                 r = manager_udev_process_rfkill(m, device, action);
 181         if (r < 0)
 182                 log_device_warning_errno(device, r, "Failed to process \"%s\" uevent, ignoring: %m",
 183                                          device_action_to_string(action));
 184
 185         return 0;
 186 }
 187
 188 static int manager_connect_udev(Manager *m) {
 189         int r;
 190
 191         /* udev does not initialize devices inside containers, so we rely on them being already
 192          * initialized before entering the container. */
 193         if (!udev_available())
 194                 return 0;
 195
 196         r = sd_device_monitor_new(&m->device_monitor);
 197         if (r < 0)
 198                 return log_error_errno(r, "Failed to initialize device monitor: %m");
 199
 200         r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_monitor, "net", NULL);
 201         if (r < 0)
 202                 return log_error_errno(r, "Could not add device monitor filter for net subsystem: %m");
 203
 204         r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_monitor, "ieee80211", NULL);
 205         if (r < 0)
 206                 return log_error_errno(r, "Could not add device monitor filter for ieee80211 subsystem: %m");
 207
 208         r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_monitor, "rfkill", NULL);
 209         if (r < 0)
 210                 return log_error_errno(r, "Could not add device monitor filter for rfkill subsystem: %m");
 211
 212         r = sd_device_monitor_attach_event(m->device_monitor, m->event);
 213         if (r < 0)
 214                 return log_error_errno(r, "Failed to attach event to device monitor: %m");
 215
 216         r = sd_device_monitor_start(m->device_monitor, manager_process_uevent, m);
 217         if (r < 0)
 218                 return log_error_errno(r, "Failed to start device monitor: %m");
 219
 220         return 0;
 221 }
 222
 223 static int manager_listen_fds(Manager *m, int *ret_rtnl_fd) {
 224         _cleanup_strv_free_ char **names = NULL;
 225         int n, rtnl_fd = -EBADF;
 226
 227         assert(m);
 228         assert(ret_rtnl_fd);
 229
 230         n = sd_listen_fds_with_names(/* unset_environment = */ true, &names);
 231         if (n < 0)
 232                 return n;
 233
 234         if (strv_length(names) != (size_t) n)
 235                 return -EINVAL;
 236
 237         for (int i = 0; i < n; i++) {
 238                 int fd = i + SD_LISTEN_FDS_START;
 239
 240                 if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1) > 0) {
 241                         if (rtnl_fd >= 0) {
 242                                 log_debug("Received multiple netlink socket, ignoring.");
 243                                 safe_close(fd);
 244                                 continue;
 245                         }
 246
 247                         rtnl_fd = fd;
 248                         continue;
 249                 }
 250
 251                 if (manager_add_tuntap_fd(m, fd, names[i]) >= 0)
 252                         continue;
 253
 254                 if (m->test_mode)
 255                         safe_close(fd);
 256                 else
 257                         close_and_notify_warn(fd, names[i]);
 258         }
 259
 260         *ret_rtnl_fd = rtnl_fd;
 261         return 0;
 262 }
 263
 264 static int manager_connect_genl(Manager *m) {
 265         int r;
 266
 267         assert(m);
 268
 269         r = sd_genl_socket_open(&m->genl);
 270         if (r < 0)
 271                 return r;
 272
 273         r = sd_netlink_increase_rxbuf(m->genl, RCVBUF_SIZE);
 274         if (r < 0)
 275                 log_warning_errno(r, "Failed to increase receive buffer size for general netlink socket, ignoring: %m");
 276
 277         r = sd_netlink_attach_event(m->genl, m->event, 0);
 278         if (r < 0)
 279                 return r;
 280
 281         r = genl_add_match(m->genl, NULL, NL80211_GENL_NAME, NL80211_MULTICAST_GROUP_CONFIG, 0,
 282                            &manager_genl_process_nl80211_config, NULL, m, "network-genl_process_nl80211_config");
 283         if (r < 0 && r != -EOPNOTSUPP)
 284                 return r;
 285
 286         r = genl_add_match(m->genl, NULL, NL80211_GENL_NAME, NL80211_MULTICAST_GROUP_MLME, 0,
 287                            &manager_genl_process_nl80211_mlme, NULL, m, "network-genl_process_nl80211_mlme");
 288         if (r < 0 && r != -EOPNOTSUPP)
 289                 return r;
 290
 291         return 0;
 292 }
 293
 294 static int manager_setup_rtnl_filter(Manager *manager) {
 295         struct sock_filter filter[] = {
 296                 /* Check the packet length. */
 297                 BPF_STMT(BPF_LD + BPF_W + BPF_LEN, 0),                                      /* A <- packet length */
 298                 BPF_JUMP(BPF_JMP + BPF_JGE + BPF_K, sizeof(struct nlmsghdr), 1, 0),         /* A (packet length) >= sizeof(struct nlmsghdr) ? */
 299                 BPF_STMT(BPF_RET + BPF_K, 0),                                               /* reject */
 300                 /* Always accept multipart message. */
 301                 BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(struct nlmsghdr, nlmsg_flags)), /* A <- message flags */
 302                 BPF_JUMP(BPF_JMP + BPF_JSET + BPF_K, htobe16(NLM_F_MULTI), 0, 1),           /* message flags has NLM_F_MULTI ? */
 303                 BPF_STMT(BPF_RET + BPF_K, UINT32_MAX),                                      /* accept */
 304                 /* Accept all message types except for RTM_NEWNEIGH or RTM_DELNEIGH. */
 305                 BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(struct nlmsghdr, nlmsg_type)),  /* A <- message type */
 306                 BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, htobe16(RTM_NEWNEIGH), 2, 0),           /* message type == RTM_NEWNEIGH ? */
 307                 BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, htobe16(RTM_DELNEIGH), 1, 0),           /* message type == RTM_DELNEIGH ? */
 308                 BPF_STMT(BPF_RET + BPF_K, UINT32_MAX),                                      /* accept */
 309                 /* Check the packet length. */
 310                 BPF_STMT(BPF_LD + BPF_W + BPF_LEN, 0),                                      /* A <- packet length */
 311                 BPF_JUMP(BPF_JMP + BPF_JGE + BPF_K, sizeof(struct nlmsghdr) + sizeof(struct ndmsg), 1, 0),
 312                                                                                             /* packet length >= sizeof(struct nlmsghdr) + sizeof(struct ndmsg) ? */
 313                 BPF_STMT(BPF_RET + BPF_K, 0),                                               /* reject */
 314                 /* Reject the message when the neighbor state does not have NUD_PERMANENT flag. */
 315                 BPF_STMT(BPF_LD + BPF_H + BPF_ABS, sizeof(struct nlmsghdr) + offsetof(struct ndmsg, ndm_state)),
 316                                                                                             /* A <- neighbor state */
 317                 BPF_JUMP(BPF_JMP + BPF_JSET + BPF_K, htobe16(NUD_PERMANENT), 1, 0),         /* neighbor state has NUD_PERMANENT ? */
 318                 BPF_STMT(BPF_RET + BPF_K, 0),                                               /* reject */
 319                 BPF_STMT(BPF_RET + BPF_K, UINT32_MAX),                                      /* accept */
 320         };
 321
 322         assert(manager);
 323         assert(manager->rtnl);
 324
 325         return sd_netlink_attach_filter(manager->rtnl, ELEMENTSOF(filter), filter);
 326 }
 327
 328 static int manager_connect_rtnl(Manager *m, int fd) {
 329         _unused_ _cleanup_close_ int fd_close = fd;
 330         int r;
 331
 332         assert(m);
 333
 334         /* This takes input fd. */
 335
 336         if (fd < 0)
 337                 r = sd_netlink_open(&m->rtnl);
 338         else
 339                 r = sd_netlink_open_fd(&m->rtnl, fd);
 340         if (r < 0)
 341                 return r;
 342         TAKE_FD(fd_close);
 343
 344         /* Bump receiver buffer, but only if we are not called via socket activation, as in that
 345          * case systemd sets the receive buffer size for us, and the value in the .socket unit
 346          * should take full effect. */
 347         if (fd < 0) {
 348                 r = sd_netlink_increase_rxbuf(m->rtnl, RCVBUF_SIZE);
 349                 if (r < 0)
 350                         log_warning_errno(r, "Failed to increase receive buffer size for rtnl socket, ignoring: %m");
 351         }
 352
 353         r = sd_netlink_attach_event(m->rtnl, m->event, 0);
 354         if (r < 0)
 355                 return r;
 356
 357         r = netlink_add_match(m->rtnl, NULL, RTM_NEWLINK, &manager_rtnl_process_link, NULL, m, "network-rtnl_process_link");
 358         if (r < 0)
 359                 return r;
 360
 361         r = netlink_add_match(m->rtnl, NULL, RTM_DELLINK, &manager_rtnl_process_link, NULL, m, "network-rtnl_process_link");
 362         if (r < 0)
 363                 return r;
 364
 365         r = netlink_add_match(m->rtnl, NULL, RTM_NEWQDISC, &manager_rtnl_process_qdisc, NULL, m, "network-rtnl_process_qdisc");
 366         if (r < 0)
 367                 return r;
 368
 369         r = netlink_add_match(m->rtnl, NULL, RTM_DELQDISC, &manager_rtnl_process_qdisc, NULL, m, "network-rtnl_process_qdisc");
 370         if (r < 0)
 371                 return r;
 372
 373         r = netlink_add_match(m->rtnl, NULL, RTM_NEWTCLASS, &manager_rtnl_process_tclass, NULL, m, "network-rtnl_process_tclass");
 374         if (r < 0)
 375                 return r;
 376
 377         r = netlink_add_match(m->rtnl, NULL, RTM_DELTCLASS, &manager_rtnl_process_tclass, NULL, m, "network-rtnl_process_tclass");
 378         if (r < 0)
 379                 return r;
 380
 381         r = netlink_add_match(m->rtnl, NULL, RTM_NEWADDR, &manager_rtnl_process_address, NULL, m, "network-rtnl_process_address");
 382         if (r < 0)
 383                 return r;
 384
 385         r = netlink_add_match(m->rtnl, NULL, RTM_DELADDR, &manager_rtnl_process_address, NULL, m, "network-rtnl_process_address");
 386         if (r < 0)
 387                 return r;
 388
 389         r = netlink_add_match(m->rtnl, NULL, RTM_NEWNEIGH, &manager_rtnl_process_neighbor, NULL, m, "network-rtnl_process_neighbor");
 390         if (r < 0)
 391                 return r;
 392
 393         r = netlink_add_match(m->rtnl, NULL, RTM_DELNEIGH, &manager_rtnl_process_neighbor, NULL, m, "network-rtnl_process_neighbor");
 394         if (r < 0)
 395                 return r;
 396
 397         r = netlink_add_match(m->rtnl, NULL, RTM_NEWROUTE, &manager_rtnl_process_route, NULL, m, "network-rtnl_process_route");
 398         if (r < 0)
 399                 return r;
 400
 401         r = netlink_add_match(m->rtnl, NULL, RTM_DELROUTE, &manager_rtnl_process_route, NULL, m, "network-rtnl_process_route");
 402         if (r < 0)
 403                 return r;
 404
 405         r = netlink_add_match(m->rtnl, NULL, RTM_NEWRULE, &manager_rtnl_process_rule, NULL, m, "network-rtnl_process_rule");
 406         if (r < 0)
 407                 return r;
 408
 409         r = netlink_add_match(m->rtnl, NULL, RTM_DELRULE, &manager_rtnl_process_rule, NULL, m, "network-rtnl_process_rule");
 410         if (r < 0)
 411                 return r;
 412
 413         r = netlink_add_match(m->rtnl, NULL, RTM_NEWNEXTHOP, &manager_rtnl_process_nexthop, NULL, m, "network-rtnl_process_nexthop");
 414         if (r < 0)
 415                 return r;
 416
 417         r = netlink_add_match(m->rtnl, NULL, RTM_DELNEXTHOP, &manager_rtnl_process_nexthop, NULL, m, "network-rtnl_process_nexthop");
 418         if (r < 0)
 419                 return r;
 420
 421         return manager_setup_rtnl_filter(m);
 422 }
 423
 424 static int manager_post_handler(sd_event_source *s, void *userdata) {
 425         Manager *manager = ASSERT_PTR(userdata);
 426
 427         (void) manager_process_remove_requests(manager);
 428         (void) manager_process_requests(manager);
 429         (void) manager_clean_all(manager);
 430         return 0;
 431 }
 432
 433 static int signal_terminate_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
 434         Manager *m = ASSERT_PTR(userdata);
 435
 436         m->restarting = false;
 437
 438         log_debug("Terminate operation initiated.");
 439
 440         return sd_event_exit(sd_event_source_get_event(s), 0);
 441 }
 442
 443 static int signal_restart_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
 444         Manager *m = ASSERT_PTR(userdata);
 445
 446         m->restarting = true;
 447
 448         log_debug("Restart operation initiated.");
 449
 450         return sd_event_exit(sd_event_source_get_event(s), 0);
 451 }
 452
 453 static int signal_reload_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
 454         Manager *m = ASSERT_PTR(userdata);
 455
 456         (void) manager_reload(m, /* message = */ NULL);
 457
 458         return 0;
 459 }
 460
 461 static int manager_set_keep_configuration(Manager *m) {
 462         int r;
 463
 464         assert(m);
 465
 466         if (in_initrd()) {
 467                 log_debug("Running in initrd, keep DHCPv4 addresses on stopping networkd by default.");
 468                 m->keep_configuration = KEEP_CONFIGURATION_DHCP_ON_STOP;
 469                 return 0;
 470         }
 471
 472         r = path_is_network_fs("/");
 473         if (r < 0)
 474                 return log_error_errno(r, "Failed to detect if root is network filesystem: %m");
 475         if (r == 0) {
 476                 m->keep_configuration = _KEEP_CONFIGURATION_INVALID;
 477                 return 0;
 478         }
 479
 480         log_debug("Running on network filesystem, enabling KeepConfiguration= by default.");
 481         m->keep_configuration = KEEP_CONFIGURATION_YES;
 482         return 0;
 483 }
 484
 485 int manager_setup(Manager *m) {
 486         _cleanup_close_ int rtnl_fd = -EBADF;
 487         int r;
 488
 489         assert(m);
 490
 491         r = sd_event_default(&m->event);
 492         if (r < 0)
 493                 return r;
 494
 495         (void) sd_event_set_watchdog(m->event, true);
 496         (void) sd_event_add_signal(m->event, NULL, SIGTERM | SD_EVENT_SIGNAL_PROCMASK, signal_terminate_callback, m);
 497         (void) sd_event_add_signal(m->event, NULL, SIGINT | SD_EVENT_SIGNAL_PROCMASK, signal_terminate_callback, m);
 498         (void) sd_event_add_signal(m->event, NULL, SIGUSR2 | SD_EVENT_SIGNAL_PROCMASK, signal_restart_callback, m);
 499         (void) sd_event_add_signal(m->event, NULL, SIGHUP | SD_EVENT_SIGNAL_PROCMASK, signal_reload_callback, m);
 500         (void) sd_event_add_signal(m->event, NULL, (SIGRTMIN+18) | SD_EVENT_SIGNAL_PROCMASK, sigrtmin18_handler, NULL);
 501
 502         r = sd_event_add_memory_pressure(m->event, NULL, NULL, NULL);
 503         if (r < 0)
 504                 log_debug_errno(r, "Failed allocate memory pressure event source, ignoring: %m");
 505
 506         r = sd_event_add_post(m->event, NULL, manager_post_handler, m);
 507         if (r < 0)
 508                 return r;
 509
 510         r = manager_listen_fds(m, &rtnl_fd);
 511         if (r < 0)
 512                 return r;
 513
 514         r = manager_connect_rtnl(m, TAKE_FD(rtnl_fd));
 515         if (r < 0)
 516                 return r;
 517
 518         r = manager_connect_genl(m);
 519         if (r < 0)
 520                 return r;
 521
 522         if (m->test_mode)
 523                 return 0;
 524
 525         r = manager_connect_varlink(m);
 526         if (r < 0)
 527                 return r;
 528
 529         r = manager_connect_bus(m);
 530         if (r < 0)
 531                 return r;
 532
 533         r = manager_connect_udev(m);
 534         if (r < 0)
 535                 return r;
 536
 537         r = sd_resolve_default(&m->resolve);
 538         if (r < 0)
 539                 return r;
 540
 541         r = sd_resolve_attach_event(m->resolve, m->event, 0);
 542         if (r < 0)
 543                 return r;
 544
 545         r = address_pool_setup_default(m);
 546         if (r < 0)
 547                 return r;
 548
 549         r = manager_set_keep_configuration(m);
 550         if (r < 0)
 551                 return r;
 552
 553         m->state_file = strdup("/run/systemd/netif/state");
 554         if (!m->state_file)
 555                 return -ENOMEM;
 556
 557         return 0;
 558 }
 559
 560 int manager_new(Manager **ret, bool test_mode) {
 561         _cleanup_(manager_freep) Manager *m = NULL;
 562
 563         m = new(Manager, 1);
 564         if (!m)
 565                 return -ENOMEM;
 566
 567         *m = (Manager) {
 568                 .keep_configuration = _KEEP_CONFIGURATION_INVALID,
 569                 .ipv6_privacy_extensions = IPV6_PRIVACY_EXTENSIONS_NO,
 570                 .test_mode = test_mode,
 571                 .speed_meter_interval_usec = SPEED_METER_DEFAULT_TIME_INTERVAL,
 572                 .online_state = _LINK_ONLINE_STATE_INVALID,
 573                 .manage_foreign_routes = true,
 574                 .manage_foreign_rules = true,
 575                 .manage_foreign_nexthops = true,
 576                 .ethtool_fd = -EBADF,
 577                 .dhcp_duid.type = DUID_TYPE_EN,
 578                 .dhcp6_duid.type = DUID_TYPE_EN,
 579                 .duid_product_uuid.type = DUID_TYPE_UUID,
 580                 .ip_forwarding = { -1, -1, },
 581         };
 582
 583         *ret = TAKE_PTR(m);
 584         return 0;
 585 }
 586
 587 Manager* manager_free(Manager *m) {
 588         Link *link;
 589
 590         if (!m)
 591                 return NULL;
 592
 593         free(m->state_file);
 594
 595         HASHMAP_FOREACH(link, m->links_by_index)
 596                 (void) link_stop_engines(link, true);
 597
 598         m->request_queue = ordered_set_free(m->request_queue);
 599         m->remove_request_queue = ordered_set_free(m->remove_request_queue);
 600
 601         m->dirty_links = set_free_with_destructor(m->dirty_links, link_unref);
 602         m->new_wlan_ifindices = set_free(m->new_wlan_ifindices);
 603         m->links_by_name = hashmap_free(m->links_by_name);
 604         m->links_by_hw_addr = hashmap_free(m->links_by_hw_addr);
 605         m->links_by_dhcp_pd_subnet_prefix = hashmap_free(m->links_by_dhcp_pd_subnet_prefix);
 606         m->links_by_index = hashmap_free_with_destructor(m->links_by_index, link_unref);
 607
 608         m->dhcp_pd_subnet_ids = set_free(m->dhcp_pd_subnet_ids);
 609         m->networks = ordered_hashmap_free_with_destructor(m->networks, network_unref);
 610
 611         m->netdevs = hashmap_free_with_destructor(m->netdevs, netdev_unref);
 612
 613         m->tuntap_fds_by_name = hashmap_free(m->tuntap_fds_by_name);
 614
 615         m->wiphy_by_name = hashmap_free(m->wiphy_by_name);
 616         m->wiphy_by_index = hashmap_free_with_destructor(m->wiphy_by_index, wiphy_free);
 617
 618         ordered_set_free_free(m->address_pools);
 619
 620         hashmap_free(m->route_table_names_by_number);
 621         hashmap_free(m->route_table_numbers_by_name);
 622
 623         set_free(m->rules);
 624
 625         sd_netlink_unref(m->rtnl);
 626         sd_netlink_unref(m->genl);
 627         sd_resolve_unref(m->resolve);
 628
 629         /* reject (e.g. unreachable) type routes are managed by Manager, but may be referenced by a
 630          * link. E.g., DHCP6 with prefix delegation creates unreachable routes, and they are referenced
 631          * by the upstream link. And the links may be referenced by netlink slots. Hence, two
 632          * set_free() must be called after the above sd_netlink_unref(). */
 633         m->routes = set_free(m->routes);
 634
 635         m->nexthops_by_id = hashmap_free(m->nexthops_by_id);
 636         m->nexthop_ids = set_free(m->nexthop_ids);
 637
 638         sd_event_source_unref(m->speed_meter_event_source);
 639         sd_event_unref(m->event);
 640
 641         sd_device_monitor_unref(m->device_monitor);
 642
 643         manager_varlink_done(m);
 644         hashmap_free(m->polkit_registry);
 645         sd_bus_flush_close_unref(m->bus);
 646
 647         free(m->dynamic_timezone);
 648         free(m->dynamic_hostname);
 649
 650         safe_close(m->ethtool_fd);
 651
 652         m->fw_ctx = fw_ctx_free(m->fw_ctx);
 653
 654         return mfree(m);
 655 }
 656
 657 int manager_start(Manager *m) {
 658         Link *link;
 659         int r;
 660
 661         assert(m);
 662
 663         manager_set_sysctl(m);
 664
 665         r = manager_start_speed_meter(m);
 666         if (r < 0)
 667                 return log_error_errno(r, "Failed to initialize speed meter: %m");
 668
 669         /* The dirty handler will deal with future serialization, but the first one
 670            must be done explicitly. */
 671
 672         r = manager_save(m);
 673         if (r < 0)
 674                 log_warning_errno(r, "Failed to update state file %s, ignoring: %m", m->state_file);
 675
 676         HASHMAP_FOREACH(link, m->links_by_index) {
 677                 r = link_save_and_clean(link);
 678                 if (r < 0)
 679                         log_link_warning_errno(link, r, "Failed to update link state file %s, ignoring: %m", link->state_file);
 680         }
 681
 682         return 0;
 683 }
 684
 685 int manager_load_config(Manager *m) {
 686         int r;
 687
 688         r = netdev_load(m, false);
 689         if (r < 0)
 690                 return r;
 691
 692         manager_clear_unmanaged_tuntap_fds(m);
 693
 694         r = network_load(m, &m->networks);
 695         if (r < 0)
 696                 return r;
 697
 698         r = manager_build_dhcp_pd_subnet_ids(m);
 699         if (r < 0)
 700                 return r;
 701
 702         r = manager_build_nexthop_ids(m);
 703         if (r < 0)
 704                 return r;
 705
 706         return 0;
 707 }
 708
 709 int manager_enumerate_internal(
 710                 Manager *m,
 711                 sd_netlink *nl,
 712                 sd_netlink_message *req,
 713                 int (*process)(sd_netlink *, sd_netlink_message *, Manager *)) {
 714
 715         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *reply = NULL;
 716         int r;
 717
 718         assert(m);
 719         assert(nl);
 720         assert(req);
 721         assert(process);
 722
 723         r = sd_netlink_message_set_request_dump(req, true);
 724         if (r < 0)
 725                 return r;
 726
 727         r = sd_netlink_call(nl, req, 0, &reply);
 728         if (r < 0)
 729                 return r;
 730
 731         m->enumerating = true;
 732         for (sd_netlink_message *reply_one = reply; reply_one; reply_one = sd_netlink_message_next(reply_one))
 733                 RET_GATHER(r, process(nl, reply_one, m));
 734         m->enumerating = false;
 735
 736         return r;
 737 }
 738
 739 static int manager_enumerate_links(Manager *m) {
 740         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 741         int r;
 742
 743         assert(m);
 744         assert(m->rtnl);
 745
 746         r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
 747         if (r < 0)
 748                 return r;
 749
 750         r = manager_enumerate_internal(m, m->rtnl, req, manager_rtnl_process_link);
 751         if (r < 0)
 752                 return r;
 753
 754         req = sd_netlink_message_unref(req);
 755
 756         r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
 757         if (r < 0)
 758                 return r;
 759
 760         r = sd_rtnl_message_link_set_family(req, AF_BRIDGE);
 761         if (r < 0)
 762                 return r;
 763
 764         return manager_enumerate_internal(m, m->rtnl, req, manager_rtnl_process_link);
 765 }
 766
 767 static int manager_enumerate_qdisc(Manager *m) {
 768         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 769         int r;
 770
 771         assert(m);
 772         assert(m->rtnl);
 773
 774         r = sd_rtnl_message_new_traffic_control(m->rtnl, &req, RTM_GETQDISC, 0, 0, 0);
 775         if (r < 0)
 776                 return r;
 777
 778         return manager_enumerate_internal(m, m->rtnl, req, manager_rtnl_process_qdisc);
 779 }
 780
 781 static int manager_enumerate_tclass(Manager *m) {
 782         Link *link;
 783         int r = 0;
 784
 785         assert(m);
 786         assert(m->rtnl);
 787
 788         /* TC class can be enumerated only per link. See tc_dump_tclass() in net/sched/sched_api.c. */
 789
 790         HASHMAP_FOREACH(link, m->links_by_index)
 791                 RET_GATHER(r, link_enumerate_tclass(link, 0));
 792
 793         return r;
 794 }
 795
 796 static int manager_enumerate_addresses(Manager *m) {
 797         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 798         int r;
 799
 800         assert(m);
 801         assert(m->rtnl);
 802
 803         r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, 0);
 804         if (r < 0)
 805                 return r;
 806
 807         return manager_enumerate_internal(m, m->rtnl, req, manager_rtnl_process_address);
 808 }
 809
 810 static int manager_enumerate_neighbors(Manager *m) {
 811         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 812         int r;
 813
 814         assert(m);
 815         assert(m->rtnl);
 816
 817         r = sd_rtnl_message_new_neigh(m->rtnl, &req, RTM_GETNEIGH, 0, AF_UNSPEC);
 818         if (r < 0)
 819                 return r;
 820
 821         return manager_enumerate_internal(m, m->rtnl, req, manager_rtnl_process_neighbor);
 822 }
 823
 824 static int manager_enumerate_routes(Manager *m) {
 825         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 826         int r;
 827
 828         assert(m);
 829         assert(m->rtnl);
 830
 831         if (!m->manage_foreign_routes)
 832                 return 0;
 833
 834         r = sd_rtnl_message_new_route(m->rtnl, &req, RTM_GETROUTE, 0, 0);
 835         if (r < 0)
 836                 return r;
 837
 838         return manager_enumerate_internal(m, m->rtnl, req, manager_rtnl_process_route);
 839 }
 840
 841 static int manager_enumerate_rules(Manager *m) {
 842         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 843         int r;
 844
 845         assert(m);
 846         assert(m->rtnl);
 847
 848         if (!m->manage_foreign_rules)
 849                 return 0;
 850
 851         r = sd_rtnl_message_new_routing_policy_rule(m->rtnl, &req, RTM_GETRULE, 0);
 852         if (r < 0)
 853                 return r;
 854
 855         return manager_enumerate_internal(m, m->rtnl, req, manager_rtnl_process_rule);
 856 }
 857
 858 static int manager_enumerate_nexthop(Manager *m) {
 859         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 860         int r;
 861
 862         assert(m);
 863         assert(m->rtnl);
 864
 865         if (!m->manage_foreign_nexthops)
 866                 return 0;
 867
 868         r = sd_rtnl_message_new_nexthop(m->rtnl, &req, RTM_GETNEXTHOP, 0, 0);
 869         if (r < 0)
 870                 return r;
 871
 872         return manager_enumerate_internal(m, m->rtnl, req, manager_rtnl_process_nexthop);
 873 }
 874
 875 static int manager_enumerate_nl80211_wiphy(Manager *m) {
 876         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 877         int r;
 878
 879         assert(m);
 880         assert(m->genl);
 881
 882         r = sd_genl_message_new(m->genl, NL80211_GENL_NAME, NL80211_CMD_GET_WIPHY, &req);
 883         if (r < 0)
 884                 return r;
 885
 886         return manager_enumerate_internal(m, m->genl, req, manager_genl_process_nl80211_wiphy);
 887 }
 888
 889 static int manager_enumerate_nl80211_config(Manager *m) {
 890         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 891         int r;
 892
 893         assert(m);
 894         assert(m->genl);
 895
 896         r = sd_genl_message_new(m->genl, NL80211_GENL_NAME, NL80211_CMD_GET_INTERFACE, &req);
 897         if (r < 0)
 898                 return r;
 899
 900         return manager_enumerate_internal(m, m->genl, req, manager_genl_process_nl80211_config);
 901 }
 902
 903 static int manager_enumerate_nl80211_mlme(Manager *m) {
 904         Link *link;
 905         int r;
 906
 907         assert(m);
 908         assert(m->genl);
 909
 910         HASHMAP_FOREACH(link, m->links_by_index) {
 911                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 912
 913                 if (link->wlan_iftype != NL80211_IFTYPE_STATION)
 914                         continue;
 915
 916                 r = sd_genl_message_new(m->genl, NL80211_GENL_NAME, NL80211_CMD_GET_STATION, &req);
 917                 if (r < 0)
 918                         return r;
 919
 920                 r = sd_netlink_message_append_u32(req, NL80211_ATTR_IFINDEX, link->ifindex);
 921                 if (r < 0)
 922                         return r;
 923
 924                 r = manager_enumerate_internal(m, m->genl, req, manager_genl_process_nl80211_mlme);
 925                 if (r < 0)
 926                         return r;
 927         }
 928
 929         return 0;
 930 }
 931
 932 int manager_enumerate(Manager *m) {
 933         int r;
 934
 935         r = manager_enumerate_links(m);
 936         if (r < 0)
 937                 return log_error_errno(r, "Could not enumerate links: %m");
 938
 939         r = manager_enumerate_qdisc(m);
 940         if (r == -EOPNOTSUPP)
 941                 log_debug_errno(r, "Could not enumerate QDiscs, ignoring: %m");
 942         else if (r < 0)
 943                 return log_error_errno(r, "Could not enumerate QDisc: %m");
 944
 945         r = manager_enumerate_tclass(m);
 946         if (r == -EOPNOTSUPP)
 947                 log_debug_errno(r, "Could not enumerate TClasses, ignoring: %m");
 948         else if (r < 0)
 949                 return log_error_errno(r, "Could not enumerate TClass: %m");
 950
 951         r = manager_enumerate_addresses(m);
 952         if (r < 0)
 953                 return log_error_errno(r, "Could not enumerate addresses: %m");
 954
 955         r = manager_enumerate_neighbors(m);
 956         if (r < 0)
 957                 return log_error_errno(r, "Could not enumerate neighbors: %m");
 958
 959         /* NextHop support is added in kernel v5.3 (65ee00a9409f751188a8cdc0988167858eb4a536),
 960          * and older kernels return -EOPNOTSUPP, or -EINVAL if SELinux is enabled. */
 961         r = manager_enumerate_nexthop(m);
 962         if (r == -EOPNOTSUPP || (r == -EINVAL && mac_selinux_enforcing()))
 963                 log_debug_errno(r, "Could not enumerate nexthops, ignoring: %m");
 964         else if (r < 0)
 965                 return log_error_errno(r, "Could not enumerate nexthops: %m");
 966
 967         r = manager_enumerate_routes(m);
 968         if (r < 0)
 969                 return log_error_errno(r, "Could not enumerate routes: %m");
 970
 971         /* If kernel is built with CONFIG_FIB_RULES=n, it returns -EOPNOTSUPP. */
 972         r = manager_enumerate_rules(m);
 973         if (r == -EOPNOTSUPP)
 974                 log_debug_errno(r, "Could not enumerate routing policy rules, ignoring: %m");
 975         else if (r < 0)
 976                 return log_error_errno(r, "Could not enumerate routing policy rules: %m");
 977
 978         r = manager_enumerate_nl80211_wiphy(m);
 979         if (r == -EOPNOTSUPP)
 980                 log_debug_errno(r, "Could not enumerate wireless LAN phy, ignoring: %m");
 981         else if (r < 0)
 982                 return log_error_errno(r, "Could not enumerate wireless LAN phy: %m");
 983
 984         r = manager_enumerate_nl80211_config(m);
 985         if (r == -EOPNOTSUPP)
 986                 log_debug_errno(r, "Could not enumerate wireless LAN interfaces, ignoring: %m");
 987         else if (r < 0)
 988                 return log_error_errno(r, "Could not enumerate wireless LAN interfaces: %m");
 989
 990         r = manager_enumerate_nl80211_mlme(m);
 991         if (r == -EOPNOTSUPP)
 992                 log_debug_errno(r, "Could not enumerate wireless LAN stations, ignoring: %m");
 993         else if (r < 0)
 994                 return log_error_errno(r, "Could not enumerate wireless LAN stations: %m");
 995
 996         return 0;
 997 }
 998
 999 static int set_hostname_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
1000         const sd_bus_error *e;
1001         int r;
1002
1003         assert(m);
1004
1005         e = sd_bus_message_get_error(m);
1006         if (e) {
1007                 r = sd_bus_error_get_errno(e);
1008                 log_warning_errno(r, "Could not set hostname: %s", bus_error_message(e, r));
1009         }
1010
1011         return 1;
1012 }
1013
1014 int manager_set_hostname(Manager *m, const char *hostname) {
1015         int r;
1016
1017         log_debug("Setting transient hostname: '%s'", strna(hostname));
1018
1019         r = free_and_strdup_warn(&m->dynamic_hostname, hostname);
1020         if (r < 0)
1021                 return r;
1022
1023         if (sd_bus_is_ready(m->bus) <= 0) {
1024                 log_debug("Not connected to system bus, setting system hostname later.");
1025                 return 0;
1026         }
1027
1028         r = bus_call_method_async(
1029                         m->bus,
1030                         NULL,
1031                         bus_hostname,
1032                         "SetHostname",
1033                         set_hostname_handler,
1034                         m,
1035                         "sb",
1036                         hostname,
1037                         false);
1038         if (r < 0)
1039                 return log_error_errno(r, "Could not set transient hostname: %m");
1040
1041         return 0;
1042 }
1043
1044 static int set_timezone_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
1045         const sd_bus_error *e;
1046         int r;
1047
1048         assert(m);
1049
1050         e = sd_bus_message_get_error(m);
1051         if (e) {
1052                 r = sd_bus_error_get_errno(e);
1053                 log_warning_errno(r, "Could not set timezone: %s", bus_error_message(e, r));
1054         }
1055
1056         return 1;
1057 }
1058
1059 int manager_set_timezone(Manager *m, const char *tz) {
1060         int r;
1061
1062         assert(m);
1063         assert(tz);
1064
1065         log_debug("Setting system timezone: '%s'", tz);
1066         r = free_and_strdup_warn(&m->dynamic_timezone, tz);
1067         if (r < 0)
1068                 return r;
1069
1070         if (sd_bus_is_ready(m->bus) <= 0) {
1071                 log_debug("Not connected to system bus, setting system timezone later.");
1072                 return 0;
1073         }
1074
1075         r = bus_call_method_async(
1076                         m->bus,
1077                         NULL,
1078                         bus_timedate,
1079                         "SetTimezone",
1080                         set_timezone_handler,
1081                         m,
1082                         "sb",
1083                         tz,
1084                         false);
1085         if (r < 0)
1086                 return log_error_errno(r, "Could not set timezone: %m");
1087
1088         return 0;
1089 }
1090
1091 int manager_reload(Manager *m, sd_bus_message *message) {
1092         Link *link;
1093         int r;
1094
1095         assert(m);
1096
1097         (void) sd_notifyf(/* unset= */ false,
1098                           "RELOADING=1\n"
1099                           "STATUS=Reloading configuration...\n"
1100                           "MONOTONIC_USEC=" USEC_FMT, now(CLOCK_MONOTONIC));
1101
1102         r = netdev_load(m, /* reload= */ true);
1103         if (r < 0)
1104                 goto finish;
1105
1106         r = network_reload(m);
1107         if (r < 0)
1108                 goto finish;
1109
1110         HASHMAP_FOREACH(link, m->links_by_index) {
1111                 if (message)
1112                         r = link_reconfigure_on_bus_method_reload(link, message);
1113                 else
1114                         r = link_reconfigure(link, /* force = */ false);
1115                 if (r < 0) {
1116                         log_link_warning_errno(link, r, "Failed to reconfigure the interface: %m");
1117                         link_enter_failed(link);
1118                 }
1119         }
1120
1121         r = 0;
1122 finish:
1123         (void) sd_notify(/* unset= */ false, NOTIFY_READY);
1124         return r;
1125 }