src/network/networkd-manager.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   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
  10 #include "sd-daemon.h"
  11 #include "sd-netlink.h"
  12
  13 #include "alloc-util.h"
  14 #include "bus-polkit.h"
  15 #include "bus-util.h"
  16 #include "conf-parser.h"
  17 #include "def.h"
  18 #include "device-private.h"
  19 #include "device-util.h"
  20 #include "dns-domain.h"
  21 #include "fd-util.h"
  22 #include "fileio.h"
  23 #include "local-addresses.h"
  24 #include "netlink-util.h"
  25 #include "network-internal.h"
  26 #include "networkd-dhcp6.h"
  27 #include "networkd-link-bus.h"
  28 #include "networkd-manager-bus.h"
  29 #include "networkd-manager.h"
  30 #include "networkd-network-bus.h"
  31 #include "networkd-speed-meter.h"
  32 #include "ordered-set.h"
  33 #include "path-util.h"
  34 #include "set.h"
  35 #include "signal-util.h"
  36 #include "strv.h"
  37 #include "sysctl-util.h"
  38 #include "tmpfile-util.h"
  39 #include "udev-util.h"
  40 #include "virt.h"
  41
  42 /* use 128 MB for receive socket kernel queue. */
  43 #define RCVBUF_SIZE    (128*1024*1024)
  44
  45 static int log_message_warning_errno(sd_netlink_message *m, int err, const char *msg) {
  46         const char *err_msg = NULL;
  47
  48         (void) sd_netlink_message_read_string(m, NLMSGERR_ATTR_MSG, &err_msg);
  49         return log_warning_errno(err, "%s: %s%s%m", msg, strempty(err_msg), err_msg ? " " : "");
  50 }
  51
  52 static int setup_default_address_pool(Manager *m) {
  53         AddressPool *p;
  54         int r;
  55
  56         assert(m);
  57
  58         /* Add in the well-known private address ranges. */
  59
  60         r = address_pool_new_from_string(m, &p, AF_INET6, "fd00::", 8);
  61         if (r < 0)
  62                 return r;
  63
  64         r = address_pool_new_from_string(m, &p, AF_INET, "10.0.0.0", 8);
  65         if (r < 0)
  66                 return r;
  67
  68         r = address_pool_new_from_string(m, &p, AF_INET, "172.16.0.0", 12);
  69         if (r < 0)
  70                 return r;
  71
  72         r = address_pool_new_from_string(m, &p, AF_INET, "192.168.0.0", 16);
  73         if (r < 0)
  74                 return r;
  75
  76         return 0;
  77 }
  78
  79 static int manager_reset_all(Manager *m) {
  80         Link *link;
  81         Iterator i;
  82         int r;
  83
  84         assert(m);
  85
  86         HASHMAP_FOREACH(link, m->links, i) {
  87                 r = link_carrier_reset(link);
  88                 if (r < 0)
  89                         log_link_warning_errno(link, r, "Could not reset carrier: %m");
  90         }
  91
  92         return 0;
  93 }
  94
  95 static int match_prepare_for_sleep(sd_bus_message *message, void *userdata, sd_bus_error *ret_error) {
  96         Manager *m = userdata;
  97         int b, r;
  98
  99         assert(message);
 100         assert(m);
 101
 102         r = sd_bus_message_read(message, "b", &b);
 103         if (r < 0) {
 104                 log_debug_errno(r, "Failed to parse PrepareForSleep signal: %m");
 105                 return 0;
 106         }
 107
 108         if (b)
 109                 return 0;
 110
 111         log_debug("Coming back from suspend, resetting all connections...");
 112
 113         (void) manager_reset_all(m);
 114
 115         return 0;
 116 }
 117
 118 static int on_connected(sd_bus_message *message, void *userdata, sd_bus_error *ret_error) {
 119         Manager *m = userdata;
 120
 121         assert(message);
 122         assert(m);
 123
 124         /* Did we get a timezone or transient hostname from DHCP while D-Bus wasn't up yet? */
 125         if (m->dynamic_hostname)
 126                 (void) manager_set_hostname(m, m->dynamic_hostname);
 127         if (m->dynamic_timezone)
 128                 (void) manager_set_timezone(m, m->dynamic_timezone);
 129         if (m->links_requesting_uuid)
 130                 (void) manager_request_product_uuid(m, NULL);
 131
 132         return 0;
 133 }
 134
 135 int manager_connect_bus(Manager *m) {
 136         int r;
 137
 138         assert(m);
 139
 140         if (m->bus)
 141                 return 0;
 142
 143         r = bus_open_system_watch_bind_with_description(&m->bus, "bus-api-network");
 144         if (r < 0)
 145                 return log_error_errno(r, "Failed to connect to bus: %m");
 146
 147         r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/network1", "org.freedesktop.network1.Manager", manager_vtable, m);
 148         if (r < 0)
 149                 return log_error_errno(r, "Failed to add manager object vtable: %m");
 150
 151         r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/network1/link", "org.freedesktop.network1.Link", link_vtable, link_object_find, m);
 152         if (r < 0)
 153                return log_error_errno(r, "Failed to add link object vtable: %m");
 154
 155         r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/network1/link", link_node_enumerator, m);
 156         if (r < 0)
 157                 return log_error_errno(r, "Failed to add link enumerator: %m");
 158
 159         r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/network1/network", "org.freedesktop.network1.Network", network_vtable, network_object_find, m);
 160         if (r < 0)
 161                return log_error_errno(r, "Failed to add network object vtable: %m");
 162
 163         r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/network1/network", network_node_enumerator, m);
 164         if (r < 0)
 165                 return log_error_errno(r, "Failed to add network enumerator: %m");
 166
 167         r = sd_bus_request_name_async(m->bus, NULL, "org.freedesktop.network1", 0, NULL, NULL);
 168         if (r < 0)
 169                 return log_error_errno(r, "Failed to request name: %m");
 170
 171         r = sd_bus_attach_event(m->bus, m->event, 0);
 172         if (r < 0)
 173                 return log_error_errno(r, "Failed to attach bus to event loop: %m");
 174
 175         r = sd_bus_match_signal_async(
 176                         m->bus,
 177                         NULL,
 178                         "org.freedesktop.DBus.Local",
 179                         NULL,
 180                         "org.freedesktop.DBus.Local",
 181                         "Connected",
 182                         on_connected, NULL, m);
 183         if (r < 0)
 184                 return log_error_errno(r, "Failed to request match on Connected signal: %m");
 185
 186         r = sd_bus_match_signal_async(
 187                         m->bus,
 188                         NULL,
 189                         "org.freedesktop.login1",
 190                         "/org/freedesktop/login1",
 191                         "org.freedesktop.login1.Manager",
 192                         "PrepareForSleep",
 193                         match_prepare_for_sleep, NULL, m);
 194         if (r < 0)
 195                 log_warning_errno(r, "Failed to request match for PrepareForSleep, ignoring: %m");
 196
 197         return 0;
 198 }
 199
 200 static int manager_udev_process_link(sd_device_monitor *monitor, sd_device *device, void *userdata) {
 201         Manager *m = userdata;
 202         DeviceAction action;
 203         Link *link = NULL;
 204         int r, ifindex;
 205
 206         assert(m);
 207         assert(device);
 208
 209         r = device_get_action(device, &action);
 210         if (r < 0) {
 211                 log_device_debug_errno(device, r, "Failed to get udev action, ignoring device: %m");
 212                 return 0;
 213         }
 214
 215         if (!IN_SET(action, DEVICE_ACTION_ADD, DEVICE_ACTION_CHANGE, DEVICE_ACTION_MOVE)) {
 216                 log_device_debug(device, "Ignoring udev %s event for device.", device_action_to_string(action));
 217                 return 0;
 218         }
 219
 220         r = sd_device_get_ifindex(device, &ifindex);
 221         if (r < 0) {
 222                 log_device_debug_errno(device, r, "Ignoring udev ADD event for device without ifindex or with invalid ifindex: %m");
 223                 return 0;
 224         }
 225
 226         r = device_is_renaming(device);
 227         if (r < 0) {
 228                 log_device_error_errno(device, r, "Failed to determine the device is renamed or not, ignoring '%s' uevent: %m",
 229                                        device_action_to_string(action));
 230                 return 0;
 231         }
 232         if (r > 0) {
 233                 log_device_debug(device, "Interface is under renaming, wait for the interface to be renamed: %m");
 234                 return 0;
 235         }
 236
 237         r = link_get(m, ifindex, &link);
 238         if (r < 0) {
 239                 if (r != -ENODEV)
 240                         log_debug_errno(r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
 241                 return 0;
 242         }
 243
 244         (void) link_initialized(link, device);
 245
 246         return 0;
 247 }
 248
 249 static int manager_connect_udev(Manager *m) {
 250         int r;
 251
 252         /* udev does not initialize devices inside containers,
 253          * so we rely on them being already initialized before
 254          * entering the container */
 255         if (detect_container() > 0)
 256                 return 0;
 257
 258         r = sd_device_monitor_new(&m->device_monitor);
 259         if (r < 0)
 260                 return log_error_errno(r, "Failed to initialize device monitor: %m");
 261
 262         r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_monitor, "net", NULL);
 263         if (r < 0)
 264                 return log_error_errno(r, "Could not add device monitor filter: %m");
 265
 266         r = sd_device_monitor_attach_event(m->device_monitor, m->event);
 267         if (r < 0)
 268                 return log_error_errno(r, "Failed to attach event to device monitor: %m");
 269
 270         r = sd_device_monitor_start(m->device_monitor, manager_udev_process_link, m);
 271         if (r < 0)
 272                 return log_error_errno(r, "Failed to start device monitor: %m");
 273
 274         return 0;
 275 }
 276
 277 int manager_rtnl_process_route(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) {
 278         _cleanup_(route_freep) Route *tmp = NULL;
 279         Route *route = NULL;
 280         Manager *m = userdata;
 281         Link *link = NULL;
 282         uint32_t ifindex;
 283         uint16_t type;
 284         unsigned char table;
 285         int r;
 286
 287         assert(rtnl);
 288         assert(message);
 289         assert(m);
 290
 291         if (sd_netlink_message_is_error(message)) {
 292                 r = sd_netlink_message_get_errno(message);
 293                 if (r < 0)
 294                         log_message_warning_errno(message, r, "rtnl: failed to receive route message, ignoring");
 295
 296                 return 0;
 297         }
 298
 299         r = sd_netlink_message_get_type(message, &type);
 300         if (r < 0) {
 301                 log_warning_errno(r, "rtnl: could not get message type, ignoring: %m");
 302                 return 0;
 303         } else if (!IN_SET(type, RTM_NEWROUTE, RTM_DELROUTE)) {
 304                 log_warning("rtnl: received unexpected message type %u when processing route, ignoring.", type);
 305                 return 0;
 306         }
 307
 308         r = sd_netlink_message_read_u32(message, RTA_OIF, &ifindex);
 309         if (r == -ENODATA) {
 310                 log_debug("rtnl: received route message without ifindex, ignoring");
 311                 return 0;
 312         } else if (r < 0) {
 313                 log_warning_errno(r, "rtnl: could not get ifindex from route message, ignoring: %m");
 314                 return 0;
 315         } else if (ifindex <= 0) {
 316                 log_warning("rtnl: received route message with invalid ifindex %d, ignoring.", ifindex);
 317                 return 0;
 318         }
 319
 320         r = link_get(m, ifindex, &link);
 321         if (r < 0 || !link) {
 322                 /* when enumerating we might be out of sync, but we will
 323                  * get the route again, so just ignore it */
 324                 if (!m->enumerating)
 325                         log_warning("rtnl: received route message for link (%d) we do not know about, ignoring", ifindex);
 326                 return 0;
 327         }
 328
 329         r = route_new(&tmp);
 330         if (r < 0)
 331                 return log_oom();
 332
 333         r = sd_rtnl_message_route_get_family(message, &tmp->family);
 334         if (r < 0) {
 335                 log_link_warning(link, "rtnl: received route message without family, ignoring");
 336                 return 0;
 337         } else if (!IN_SET(tmp->family, AF_INET, AF_INET6)) {
 338                 log_link_debug(link, "rtnl: received route message with invalid family '%i', ignoring", tmp->family);
 339                 return 0;
 340         }
 341
 342         r = sd_rtnl_message_route_get_protocol(message, &tmp->protocol);
 343         if (r < 0) {
 344                 log_warning_errno(r, "rtnl: received route message without route protocol: %m");
 345                 return 0;
 346         }
 347
 348         switch (tmp->family) {
 349         case AF_INET:
 350                 r = sd_netlink_message_read_in_addr(message, RTA_DST, &tmp->dst.in);
 351                 if (r < 0 && r != -ENODATA) {
 352                         log_link_warning_errno(link, r, "rtnl: received route message without valid destination, ignoring: %m");
 353                         return 0;
 354                 }
 355
 356                 r = sd_netlink_message_read_in_addr(message, RTA_GATEWAY, &tmp->gw.in);
 357                 if (r < 0 && r != -ENODATA) {
 358                         log_link_warning_errno(link, r, "rtnl: received route message without valid gateway, ignoring: %m");
 359                         return 0;
 360                 }
 361
 362                 r = sd_netlink_message_read_in_addr(message, RTA_SRC, &tmp->src.in);
 363                 if (r < 0 && r != -ENODATA) {
 364                         log_link_warning_errno(link, r, "rtnl: received route message without valid source, ignoring: %m");
 365                         return 0;
 366                 }
 367
 368                 r = sd_netlink_message_read_in_addr(message, RTA_PREFSRC, &tmp->prefsrc.in);
 369                 if (r < 0 && r != -ENODATA) {
 370                         log_link_warning_errno(link, r, "rtnl: received route message without valid preferred source, ignoring: %m");
 371                         return 0;
 372                 }
 373
 374                 break;
 375
 376         case AF_INET6:
 377                 r = sd_netlink_message_read_in6_addr(message, RTA_DST, &tmp->dst.in6);
 378                 if (r < 0 && r != -ENODATA) {
 379                         log_link_warning_errno(link, r, "rtnl: received route message without valid destination, ignoring: %m");
 380                         return 0;
 381                 }
 382
 383                 r = sd_netlink_message_read_in6_addr(message, RTA_GATEWAY, &tmp->gw.in6);
 384                 if (r < 0 && r != -ENODATA) {
 385                         log_link_warning_errno(link, r, "rtnl: received route message without valid gateway, ignoring: %m");
 386                         return 0;
 387                 }
 388
 389                 r = sd_netlink_message_read_in6_addr(message, RTA_SRC, &tmp->src.in6);
 390                 if (r < 0 && r != -ENODATA) {
 391                         log_link_warning_errno(link, r, "rtnl: received route message without valid source, ignoring: %m");
 392                         return 0;
 393                 }
 394
 395                 r = sd_netlink_message_read_in6_addr(message, RTA_PREFSRC, &tmp->prefsrc.in6);
 396                 if (r < 0 && r != -ENODATA) {
 397                         log_link_warning_errno(link, r, "rtnl: received route message without valid preferred source, ignoring: %m");
 398                         return 0;
 399                 }
 400
 401                 break;
 402
 403         default:
 404                 assert_not_reached("Received route message with unsupported address family");
 405                 return 0;
 406         }
 407
 408         r = sd_rtnl_message_route_get_dst_prefixlen(message, &tmp->dst_prefixlen);
 409         if (r < 0) {
 410                 log_link_warning_errno(link, r, "rtnl: received route message with invalid destination prefixlen, ignoring: %m");
 411                 return 0;
 412         }
 413
 414         r = sd_rtnl_message_route_get_src_prefixlen(message, &tmp->src_prefixlen);
 415         if (r < 0) {
 416                 log_link_warning_errno(link, r, "rtnl: received route message with invalid source prefixlen, ignoring: %m");
 417                 return 0;
 418         }
 419
 420         r = sd_rtnl_message_route_get_scope(message, &tmp->scope);
 421         if (r < 0) {
 422                 log_link_warning_errno(link, r, "rtnl: received route message with invalid scope, ignoring: %m");
 423                 return 0;
 424         }
 425
 426         r = sd_rtnl_message_route_get_tos(message, &tmp->tos);
 427         if (r < 0) {
 428                 log_link_warning_errno(link, r, "rtnl: received route message with invalid tos, ignoring: %m");
 429                 return 0;
 430         }
 431
 432         r = sd_rtnl_message_route_get_type(message, &tmp->type);
 433         if (r < 0) {
 434                 log_link_warning_errno(link, r, "rtnl: received route message with invalid type, ignoring: %m");
 435                 return 0;
 436         }
 437
 438         r = sd_rtnl_message_route_get_table(message, &table);
 439         if (r < 0) {
 440                 log_link_warning_errno(link, r, "rtnl: received route message with invalid table, ignoring: %m");
 441                 return 0;
 442         }
 443         tmp->table = table;
 444
 445         r = sd_netlink_message_read_u32(message, RTA_PRIORITY, &tmp->priority);
 446         if (r < 0 && r != -ENODATA) {
 447                 log_link_warning_errno(link, r, "rtnl: received route message with invalid priority, ignoring: %m");
 448                 return 0;
 449         }
 450
 451         r = sd_netlink_message_enter_container(message, RTA_METRICS);
 452         if (r < 0 && r != -ENODATA) {
 453                 log_link_error_errno(link, r, "rtnl: Could not enter RTA_METRICS container: %m");
 454                 return 0;
 455         }
 456         if (r >= 0) {
 457                 r = sd_netlink_message_read_u32(message, RTAX_INITCWND, &tmp->initcwnd);
 458                 if (r < 0 && r != -ENODATA) {
 459                         log_link_warning_errno(link, r, "rtnl: received route message with invalid initcwnd, ignoring: %m");
 460                         return 0;
 461                 }
 462
 463                 r = sd_netlink_message_read_u32(message, RTAX_INITRWND, &tmp->initrwnd);
 464                 if (r < 0 && r != -ENODATA) {
 465                         log_link_warning_errno(link, r, "rtnl: received route message with invalid initrwnd, ignoring: %m");
 466                         return 0;
 467                 }
 468
 469                 r = sd_netlink_message_exit_container(message);
 470                 if (r < 0) {
 471                         log_link_error_errno(link, r, "rtnl: Could not exit from RTA_METRICS container: %m");
 472                         return 0;
 473                 }
 474         }
 475
 476         (void) route_get(link, tmp, &route);
 477
 478         if (DEBUG_LOGGING) {
 479                 _cleanup_free_ char *buf_dst = NULL, *buf_dst_prefixlen = NULL,
 480                         *buf_src = NULL, *buf_gw = NULL, *buf_prefsrc = NULL;
 481                 char buf_scope[ROUTE_SCOPE_STR_MAX], buf_table[ROUTE_TABLE_STR_MAX],
 482                         buf_protocol[ROUTE_PROTOCOL_STR_MAX];
 483
 484                 if (!in_addr_is_null(tmp->family, &tmp->dst)) {
 485                         (void) in_addr_to_string(tmp->family, &tmp->dst, &buf_dst);
 486                         (void) asprintf(&buf_dst_prefixlen, "/%u", tmp->dst_prefixlen);
 487                 }
 488                 if (!in_addr_is_null(tmp->family, &tmp->src))
 489                         (void) in_addr_to_string(tmp->family, &tmp->src, &buf_src);
 490                 if (!in_addr_is_null(tmp->family, &tmp->gw))
 491                         (void) in_addr_to_string(tmp->family, &tmp->gw, &buf_gw);
 492                 if (!in_addr_is_null(tmp->family, &tmp->prefsrc))
 493                         (void) in_addr_to_string(tmp->family, &tmp->prefsrc, &buf_prefsrc);
 494
 495                 log_link_debug(link,
 496                                "%s route: dst: %s%s, src: %s, gw: %s, prefsrc: %s, scope: %s, table: %s, proto: %s, type: %s",
 497                                type == RTM_DELROUTE ? "Forgetting" : route ? "Received remembered" : "Remembering",
 498                                strna(buf_dst), strempty(buf_dst_prefixlen),
 499                                strna(buf_src), strna(buf_gw), strna(buf_prefsrc),
 500                                format_route_scope(tmp->scope, buf_scope, sizeof buf_scope),
 501                                format_route_table(tmp->table, buf_table, sizeof buf_table),
 502                                format_route_protocol(tmp->protocol, buf_protocol, sizeof buf_protocol),
 503                                strna(route_type_to_string(tmp->type)));
 504         }
 505
 506         switch (type) {
 507         case RTM_NEWROUTE:
 508                 if (!route) {
 509                         /* A route appeared that we did not request */
 510                         r = route_add_foreign(link, tmp, &route);
 511                         if (r < 0) {
 512                                 log_link_warning_errno(link, r, "Failed to remember foreign route, ignoring: %m");
 513                                 return 0;
 514                         }
 515                 }
 516
 517                 break;
 518
 519         case RTM_DELROUTE:
 520                 route_free(route);
 521                 break;
 522
 523         default:
 524                 assert_not_reached("Received route message with invalid RTNL message type");
 525         }
 526
 527         return 1;
 528 }
 529
 530 static int manager_rtnl_process_neighbor_lladdr(sd_netlink_message *message, union lladdr_union *lladdr, size_t *size, char **str) {
 531         int r;
 532
 533         assert(message);
 534         assert(lladdr);
 535         assert(size);
 536         assert(str);
 537
 538         *str = NULL;
 539
 540         r = sd_netlink_message_read(message, NDA_LLADDR, sizeof(lladdr->ip.in6), &lladdr->ip.in6);
 541         if (r >= 0) {
 542                 *size = sizeof(lladdr->ip.in6);
 543                 if (in_addr_to_string(AF_INET6, &lladdr->ip, str) < 0)
 544                         log_warning_errno(r, "Could not print lower address: %m");
 545                 return r;
 546         }
 547
 548         r = sd_netlink_message_read(message, NDA_LLADDR, sizeof(lladdr->mac), &lladdr->mac);
 549         if (r >= 0) {
 550                 *size = sizeof(lladdr->mac);
 551                 *str = new(char, ETHER_ADDR_TO_STRING_MAX);
 552                 if (!*str) {
 553                         log_oom();
 554                         return r;
 555                 }
 556                 ether_addr_to_string(&lladdr->mac, *str);
 557                 return r;
 558         }
 559
 560         r = sd_netlink_message_read(message, NDA_LLADDR, sizeof(lladdr->ip.in), &lladdr->ip.in);
 561         if (r >= 0) {
 562                 *size = sizeof(lladdr->ip.in);
 563                 if (in_addr_to_string(AF_INET, &lladdr->ip, str) < 0)
 564                         log_warning_errno(r, "Could not print lower address: %m");
 565                 return r;
 566         }
 567
 568         return r;
 569 }
 570
 571 int manager_rtnl_process_neighbor(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) {
 572         Manager *m = userdata;
 573         Link *link = NULL;
 574         Neighbor *neighbor = NULL;
 575         int ifindex, family, r;
 576         uint16_t type, state;
 577         union in_addr_union in_addr = IN_ADDR_NULL;
 578         _cleanup_free_ char *addr_str = NULL;
 579         union lladdr_union lladdr;
 580         size_t lladdr_size = 0;
 581         _cleanup_free_ char *lladdr_str = NULL;
 582
 583         assert(rtnl);
 584         assert(message);
 585         assert(m);
 586
 587         if (sd_netlink_message_is_error(message)) {
 588                 r = sd_netlink_message_get_errno(message);
 589                 if (r < 0)
 590                         log_message_warning_errno(message, r, "rtnl: failed to receive neighbor message, ignoring");
 591
 592                 return 0;
 593         }
 594
 595         r = sd_netlink_message_get_type(message, &type);
 596         if (r < 0) {
 597                 log_warning_errno(r, "rtnl: could not get message type, ignoring: %m");
 598                 return 0;
 599         } else if (!IN_SET(type, RTM_NEWNEIGH, RTM_DELNEIGH)) {
 600                 log_warning("rtnl: received unexpected message type %u when processing neighbor, ignoring.", type);
 601                 return 0;
 602         }
 603
 604         r = sd_rtnl_message_neigh_get_state(message, &state);
 605         if (r < 0) {
 606                 log_link_warning_errno(link, r, "rtnl: received neighbor message with invalid state, ignoring: %m");
 607                 return 0;
 608         } else if (!FLAGS_SET(state, NUD_PERMANENT)) {
 609                 log_debug("rtnl: received non-static neighbor, ignoring.");
 610                 return 0;
 611         }
 612
 613         r = sd_rtnl_message_neigh_get_ifindex(message, &ifindex);
 614         if (r < 0) {
 615                 log_warning_errno(r, "rtnl: could not get ifindex from message, ignoring: %m");
 616                 return 0;
 617         } else if (ifindex <= 0) {
 618                 log_warning("rtnl: received neighbor message with invalid ifindex %d, ignoring.", ifindex);
 619                 return 0;
 620         }
 621
 622         r = link_get(m, ifindex, &link);
 623         if (r < 0 || !link) {
 624                 /* when enumerating we might be out of sync, but we will get the neighbor again, so just
 625                  * ignore it */
 626                 if (!m->enumerating)
 627                         log_warning("rtnl: received neighbor for link '%d' we don't know about, ignoring.", ifindex);
 628                 return 0;
 629         }
 630
 631         r = sd_rtnl_message_neigh_get_family(message, &family);
 632         if (r < 0) {
 633                 log_link_warning(link, "rtnl: received neighbor message without family, ignoring.");
 634                 return 0;
 635         } else if (!IN_SET(family, AF_INET, AF_INET6)) {
 636                 log_link_debug(link, "rtnl: received neighbor message with invalid family '%i', ignoring.", family);
 637                 return 0;
 638         }
 639
 640         switch (family) {
 641         case AF_INET:
 642                 r = sd_netlink_message_read_in_addr(message, NDA_DST, &in_addr.in);
 643                 if (r < 0) {
 644                         log_link_warning_errno(link, r, "rtnl: received neighbor message without valid address, ignoring: %m");
 645                         return 0;
 646                 }
 647
 648                 break;
 649
 650         case AF_INET6:
 651                 r = sd_netlink_message_read_in6_addr(message, NDA_DST, &in_addr.in6);
 652                 if (r < 0) {
 653                         log_link_warning_errno(link, r, "rtnl: received neighbor message without valid address, ignoring: %m");
 654                         return 0;
 655                 }
 656
 657                 break;
 658
 659         default:
 660                 assert_not_reached("Received unsupported address family");
 661         }
 662
 663         if (in_addr_to_string(family, &in_addr, &addr_str) < 0)
 664                 log_link_warning_errno(link, r, "Could not print address: %m");
 665
 666         r = manager_rtnl_process_neighbor_lladdr(message, &lladdr, &lladdr_size, &lladdr_str);
 667         if (r < 0) {
 668                 log_link_warning_errno(link, r, "rtnl: received neighbor message with invalid lladdr, ignoring: %m");
 669                 return 0;
 670         }
 671
 672         (void) neighbor_get(link, family, &in_addr, &lladdr, lladdr_size, &neighbor);
 673
 674         switch (type) {
 675         case RTM_NEWNEIGH:
 676                 if (neighbor)
 677                         log_link_debug(link, "Remembering neighbor: %s->%s",
 678                                        strnull(addr_str), strnull(lladdr_str));
 679                 else {
 680                         /* A neighbor appeared that we did not request */
 681                         r = neighbor_add_foreign(link, family, &in_addr, &lladdr, lladdr_size, &neighbor);
 682                         if (r < 0) {
 683                                 log_link_warning_errno(link, r, "Failed to remember foreign neighbor %s->%s, ignoring: %m",
 684                                                        strnull(addr_str), strnull(lladdr_str));
 685                                 return 0;
 686                         } else
 687                                 log_link_debug(link, "Remembering foreign neighbor: %s->%s",
 688                                                strnull(addr_str), strnull(lladdr_str));
 689                 }
 690
 691                 break;
 692
 693         case RTM_DELNEIGH:
 694                 if (neighbor) {
 695                         log_link_debug(link, "Forgetting neighbor: %s->%s",
 696                                        strnull(addr_str), strnull(lladdr_str));
 697                         (void) neighbor_free(neighbor);
 698                 } else
 699                         log_link_debug(link, "Kernel removed a neighbor we don't remember: %s->%s, ignoring.",
 700                                        strnull(addr_str), strnull(lladdr_str));
 701
 702                 break;
 703
 704         default:
 705                 assert_not_reached("Received invalid RTNL message type");
 706         }
 707
 708         return 1;
 709 }
 710
 711 int manager_rtnl_process_address(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) {
 712         _cleanup_free_ char *buf = NULL;
 713         Manager *m = userdata;
 714         Link *link = NULL;
 715         uint16_t type;
 716         unsigned char flags, prefixlen, scope;
 717         union in_addr_union in_addr = IN_ADDR_NULL;
 718         struct ifa_cacheinfo cinfo;
 719         Address *address = NULL;
 720         char valid_buf[FORMAT_TIMESPAN_MAX];
 721         const char *valid_str = NULL;
 722         int ifindex, family, r;
 723
 724         assert(rtnl);
 725         assert(message);
 726         assert(m);
 727
 728         if (sd_netlink_message_is_error(message)) {
 729                 r = sd_netlink_message_get_errno(message);
 730                 if (r < 0)
 731                         log_message_warning_errno(message, r, "rtnl: failed to receive address message, ignoring");
 732
 733                 return 0;
 734         }
 735
 736         r = sd_netlink_message_get_type(message, &type);
 737         if (r < 0) {
 738                 log_warning_errno(r, "rtnl: could not get message type, ignoring: %m");
 739                 return 0;
 740         } else if (!IN_SET(type, RTM_NEWADDR, RTM_DELADDR)) {
 741                 log_warning("rtnl: received unexpected message type %u when processing address, ignoring.", type);
 742                 return 0;
 743         }
 744
 745         r = sd_rtnl_message_addr_get_ifindex(message, &ifindex);
 746         if (r < 0) {
 747                 log_warning_errno(r, "rtnl: could not get ifindex from message, ignoring: %m");
 748                 return 0;
 749         } else if (ifindex <= 0) {
 750                 log_warning("rtnl: received address message with invalid ifindex %d, ignoring.", ifindex);
 751                 return 0;
 752         }
 753
 754         r = link_get(m, ifindex, &link);
 755         if (r < 0 || !link) {
 756                 /* when enumerating we might be out of sync, but we will get the address again, so just
 757                  * ignore it */
 758                 if (!m->enumerating)
 759                         log_warning("rtnl: received address for link '%d' we don't know about, ignoring.", ifindex);
 760                 return 0;
 761         }
 762
 763         r = sd_rtnl_message_addr_get_family(message, &family);
 764         if (r < 0) {
 765                 log_link_warning(link, "rtnl: received address message without family, ignoring.");
 766                 return 0;
 767         } else if (!IN_SET(family, AF_INET, AF_INET6)) {
 768                 log_link_debug(link, "rtnl: received address message with invalid family '%i', ignoring.", family);
 769                 return 0;
 770         }
 771
 772         r = sd_rtnl_message_addr_get_prefixlen(message, &prefixlen);
 773         if (r < 0) {
 774                 log_link_warning_errno(link, r, "rtnl: received address message with invalid prefixlen, ignoring: %m");
 775                 return 0;
 776         }
 777
 778         r = sd_rtnl_message_addr_get_scope(message, &scope);
 779         if (r < 0) {
 780                 log_link_warning_errno(link, r, "rtnl: received address message with invalid scope, ignoring: %m");
 781                 return 0;
 782         }
 783
 784         r = sd_rtnl_message_addr_get_flags(message, &flags);
 785         if (r < 0) {
 786                 log_link_warning_errno(link, r, "rtnl: received address message with invalid flags, ignoring: %m");
 787                 return 0;
 788         }
 789
 790         switch (family) {
 791         case AF_INET:
 792                 r = sd_netlink_message_read_in_addr(message, IFA_LOCAL, &in_addr.in);
 793                 if (r < 0) {
 794                         log_link_warning_errno(link, r, "rtnl: received address message without valid address, ignoring: %m");
 795                         return 0;
 796                 }
 797
 798                 break;
 799
 800         case AF_INET6:
 801                 r = sd_netlink_message_read_in6_addr(message, IFA_ADDRESS, &in_addr.in6);
 802                 if (r < 0) {
 803                         log_link_warning_errno(link, r, "rtnl: received address message without valid address, ignoring: %m");
 804                         return 0;
 805                 }
 806
 807                 break;
 808
 809         default:
 810                 assert_not_reached("Received unsupported address family");
 811         }
 812
 813         r = in_addr_to_string(family, &in_addr, &buf);
 814         if (r < 0)
 815                 log_link_warning_errno(link, r, "Could not print address: %m");
 816
 817         r = sd_netlink_message_read_cache_info(message, IFA_CACHEINFO, &cinfo);
 818         if (r < 0 && r != -ENODATA) {
 819                 log_link_warning_errno(link, r, "rtnl: cannot get IFA_CACHEINFO attribute, ignoring: %m");
 820                 return 0;
 821         } else if (r >= 0 && cinfo.ifa_valid != CACHE_INFO_INFINITY_LIFE_TIME)
 822                 valid_str = format_timespan(valid_buf, FORMAT_TIMESPAN_MAX,
 823                                             cinfo.ifa_valid * USEC_PER_SEC,
 824                                             USEC_PER_SEC);
 825
 826         (void) address_get(link, family, &in_addr, prefixlen, &address);
 827
 828         switch (type) {
 829         case RTM_NEWADDR:
 830                 if (address)
 831                         log_link_debug(link, "Remembering updated address: %s/%u (valid %s%s)",
 832                                        strnull(buf), prefixlen,
 833                                        valid_str ? "for " : "forever", strempty(valid_str));
 834                 else {
 835                         /* An address appeared that we did not request */
 836                         r = address_add_foreign(link, family, &in_addr, prefixlen, &address);
 837                         if (r < 0) {
 838                                 log_link_warning_errno(link, r, "Failed to remember foreign address %s/%u, ignoring: %m",
 839                                                        strnull(buf), prefixlen);
 840                                 return 0;
 841                         } else
 842                                 log_link_debug(link, "Remembering foreign address: %s/%u (valid %s%s)",
 843                                                strnull(buf), prefixlen,
 844                                                valid_str ? "for " : "forever", strempty(valid_str));
 845                 }
 846
 847                 /* address_update() logs internally, so we don't need to. */
 848                 (void) address_update(address, flags, scope, &cinfo);
 849
 850                 break;
 851
 852         case RTM_DELADDR:
 853                 if (address) {
 854                         log_link_debug(link, "Forgetting address: %s/%u (valid %s%s)",
 855                                        strnull(buf), prefixlen,
 856                                        valid_str ? "for " : "forever", strempty(valid_str));
 857                         (void) address_drop(address);
 858                 } else
 859                         log_link_debug(link, "Kernel removed an address we don't remember: %s/%u (valid %s%s), ignoring.",
 860                                        strnull(buf), prefixlen,
 861                                        valid_str ? "for " : "forever", strempty(valid_str));
 862
 863                 break;
 864
 865         default:
 866                 assert_not_reached("Received invalid RTNL message type");
 867         }
 868
 869         return 1;
 870 }
 871
 872 static int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) {
 873         Manager *m = userdata;
 874         Link *link = NULL;
 875         NetDev *netdev = NULL;
 876         uint16_t type;
 877         const char *name;
 878         int r, ifindex;
 879
 880         assert(rtnl);
 881         assert(message);
 882         assert(m);
 883
 884         if (sd_netlink_message_is_error(message)) {
 885                 r = sd_netlink_message_get_errno(message);
 886                 if (r < 0)
 887                         log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring");
 888
 889                 return 0;
 890         }
 891
 892         r = sd_netlink_message_get_type(message, &type);
 893         if (r < 0) {
 894                 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
 895                 return 0;
 896         } else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
 897                 log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type);
 898                 return 0;
 899         }
 900
 901         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 902         if (r < 0) {
 903                 log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m");
 904                 return 0;
 905         } else if (ifindex <= 0) {
 906                 log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex);
 907                 return 0;
 908         }
 909
 910         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
 911         if (r < 0) {
 912                 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
 913                 return 0;
 914         }
 915
 916         (void) link_get(m, ifindex, &link);
 917         (void) netdev_get(m, name, &netdev);
 918
 919         switch (type) {
 920         case RTM_NEWLINK:
 921                 if (!link) {
 922                         /* link is new, so add it */
 923                         r = link_add(m, message, &link);
 924                         if (r < 0) {
 925                                 log_warning_errno(r, "Could not process new link message, ignoring: %m");
 926                                 return 0;
 927                         }
 928                 }
 929
 930                 if (netdev) {
 931                         /* netdev exists, so make sure the ifindex matches */
 932                         r = netdev_set_ifindex(netdev, message);
 933                         if (r < 0) {
 934                                 log_warning_errno(r, "Could not process new link message for netdev, ignoring: %m");
 935                                 return 0;
 936                         }
 937                 }
 938
 939                 r = link_update(link, message);
 940                 if (r < 0) {
 941                         log_warning_errno(r, "Could not process link message, ignoring: %m");
 942                         return 0;
 943                 }
 944
 945                 break;
 946
 947         case RTM_DELLINK:
 948                 link_drop(link);
 949                 netdev_drop(netdev);
 950
 951                 break;
 952
 953         default:
 954                 assert_not_reached("Received link message with invalid RTNL message type.");
 955         }
 956
 957         return 1;
 958 }
 959
 960 int manager_rtnl_process_rule(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) {
 961         _cleanup_(routing_policy_rule_freep) RoutingPolicyRule *tmp = NULL;
 962         _cleanup_free_ char *from = NULL, *to = NULL;
 963         RoutingPolicyRule *rule = NULL;
 964         const char *iif = NULL, *oif = NULL;
 965         Manager *m = userdata;
 966         unsigned flags;
 967         uint16_t type;
 968         int r;
 969
 970         assert(rtnl);
 971         assert(message);
 972         assert(m);
 973
 974         if (sd_netlink_message_is_error(message)) {
 975                 r = sd_netlink_message_get_errno(message);
 976                 if (r < 0)
 977                         log_message_warning_errno(message, r, "rtnl: failed to receive rule message, ignoring");
 978
 979                 return 0;
 980         }
 981
 982         r = sd_netlink_message_get_type(message, &type);
 983         if (r < 0) {
 984                 log_warning_errno(r, "rtnl: could not get message type, ignoring: %m");
 985                 return 0;
 986         } else if (!IN_SET(type, RTM_NEWRULE, RTM_DELRULE)) {
 987                 log_warning("rtnl: received unexpected message type %u when processing rule, ignoring.", type);
 988                 return 0;
 989         }
 990
 991         r = routing_policy_rule_new(&tmp);
 992         if (r < 0) {
 993                 log_oom();
 994                 return 0;
 995         }
 996
 997         r = sd_rtnl_message_get_family(message, &tmp->family);
 998         if (r < 0) {
 999                 log_warning_errno(r, "rtnl: could not get rule family, ignoring: %m");
1000                 return 0;
1001         } else if (!IN_SET(tmp->family, AF_INET, AF_INET6)) {
1002                 log_debug("rtnl: received rule message with invalid family %d, ignoring.", tmp->family);
1003                 return 0;
1004         }
1005
1006         switch (tmp->family) {
1007         case AF_INET:
1008                 r = sd_netlink_message_read_in_addr(message, FRA_SRC, &tmp->from.in);
1009                 if (r < 0 && r != -ENODATA) {
1010                         log_warning_errno(r, "rtnl: could not get FRA_SRC attribute, ignoring: %m");
1011                         return 0;
1012                 } else if (r >= 0) {
1013                         r = sd_rtnl_message_routing_policy_rule_get_rtm_src_prefixlen(message, &tmp->from_prefixlen);
1014                         if (r < 0) {
1015                                 log_warning_errno(r, "rtnl: received rule message without valid source prefix length, ignoring: %m");
1016                                 return 0;
1017                         }
1018                 }
1019
1020                 r = sd_netlink_message_read_in_addr(message, FRA_DST, &tmp->to.in);
1021                 if (r < 0 && r != -ENODATA) {
1022                         log_warning_errno(r, "rtnl: could not get FRA_DST attribute, ignoring: %m");
1023                         return 0;
1024                 } else if (r >= 0) {
1025                         r = sd_rtnl_message_routing_policy_rule_get_rtm_dst_prefixlen(message, &tmp->to_prefixlen);
1026                         if (r < 0) {
1027                                 log_warning_errno(r, "rtnl: received rule message without valid destination prefix length, ignoring: %m");
1028                                 return 0;
1029                         }
1030                 }
1031
1032                 break;
1033
1034         case AF_INET6:
1035                 r = sd_netlink_message_read_in6_addr(message, FRA_SRC, &tmp->from.in6);
1036                 if (r < 0 && r != -ENODATA) {
1037                         log_warning_errno(r, "rtnl: could not get FRA_SRC attribute, ignoring: %m");
1038                         return 0;
1039                 } else if (r >= 0) {
1040                         r = sd_rtnl_message_routing_policy_rule_get_rtm_src_prefixlen(message, &tmp->from_prefixlen);
1041                         if (r < 0) {
1042                                 log_warning_errno(r, "rtnl: received rule message without valid source prefix length, ignoring: %m");
1043                                 return 0;
1044                         }
1045                 }
1046
1047                 r = sd_netlink_message_read_in6_addr(message, FRA_DST, &tmp->to.in6);
1048                 if (r < 0 && r != -ENODATA) {
1049                         log_warning_errno(r, "rtnl: could not get FRA_DST attribute, ignoring: %m");
1050                         return 0;
1051                 } else if (r >= 0) {
1052                         r = sd_rtnl_message_routing_policy_rule_get_rtm_dst_prefixlen(message, &tmp->to_prefixlen);
1053                         if (r < 0) {
1054                                 log_warning_errno(r, "rtnl: received rule message without valid destination prefix length, ignoring: %m");
1055                                 return 0;
1056                         }
1057                 }
1058
1059                 break;
1060
1061         default:
1062                 assert_not_reached("Received rule message with unsupported address family");
1063         }
1064
1065         if (tmp->from_prefixlen == 0 && tmp->to_prefixlen == 0)
1066                 return 0;
1067
1068         r = sd_rtnl_message_routing_policy_rule_get_flags(message, &flags);
1069         if (r < 0) {
1070                 log_warning_errno(r, "rtnl: received rule message without valid flag, ignoring: %m");
1071                 return 0;
1072         }
1073         tmp->invert_rule = flags & FIB_RULE_INVERT;
1074
1075         r = sd_netlink_message_read_u32(message, FRA_FWMARK, &tmp->fwmark);
1076         if (r < 0 && r != -ENODATA) {
1077                 log_warning_errno(r, "rtnl: could not get FRA_FWMARK attribute, ignoring: %m");
1078                 return 0;
1079         }
1080
1081         r = sd_netlink_message_read_u32(message, FRA_FWMASK, &tmp->fwmask);
1082         if (r < 0 && r != -ENODATA) {
1083                 log_warning_errno(r, "rtnl: could not get FRA_FWMASK attribute, ignoring: %m");
1084                 return 0;
1085         }
1086
1087         r = sd_netlink_message_read_u32(message, FRA_PRIORITY, &tmp->priority);
1088         if (r < 0 && r != -ENODATA) {
1089                 log_warning_errno(r, "rtnl: could not get FRA_PRIORITY attribute, ignoring: %m");
1090                 return 0;
1091         }
1092
1093         r = sd_netlink_message_read_u32(message, FRA_TABLE, &tmp->table);
1094         if (r < 0 && r != -ENODATA) {
1095                 log_warning_errno(r, "rtnl: could not get FRA_TABLE attribute, ignoring: %m");
1096                 return 0;
1097         }
1098
1099         r = sd_rtnl_message_routing_policy_rule_get_tos(message, &tmp->tos);
1100         if (r < 0 && r != -ENODATA) {
1101                 log_warning_errno(r, "rtnl: could not get ip rule TOS, ignoring: %m");
1102                 return 0;
1103         }
1104
1105         r = sd_netlink_message_read_string(message, FRA_IIFNAME, &iif);
1106         if (r < 0 && r != -ENODATA) {
1107                 log_warning_errno(r, "rtnl: could not get FRA_IIFNAME attribute, ignoring: %m");
1108                 return 0;
1109         }
1110         r = free_and_strdup(&tmp->iif, iif);
1111         if (r < 0)
1112                 return log_oom();
1113
1114         r = sd_netlink_message_read_string(message, FRA_OIFNAME, &oif);
1115         if (r < 0 && r != -ENODATA) {
1116                 log_warning_errno(r, "rtnl: could not get FRA_OIFNAME attribute, ignoring: %m");
1117                 return 0;
1118         }
1119         r = free_and_strdup(&tmp->oif, oif);
1120         if (r < 0)
1121                 return log_oom();
1122
1123         r = sd_netlink_message_read_u8(message, FRA_IP_PROTO, &tmp->protocol);
1124         if (r < 0 && r != -ENODATA) {
1125                 log_warning_errno(r, "rtnl: could not get FRA_IP_PROTO attribute, ignoring: %m");
1126                 return 0;
1127         }
1128
1129         r = sd_netlink_message_read(message, FRA_SPORT_RANGE, sizeof(tmp->sport), &tmp->sport);
1130         if (r < 0 && r != -ENODATA) {
1131                 log_warning_errno(r, "rtnl: could not get FRA_SPORT_RANGE attribute, ignoring: %m");
1132                 return 0;
1133         }
1134
1135         r = sd_netlink_message_read(message, FRA_DPORT_RANGE, sizeof(tmp->dport), &tmp->dport);
1136         if (r < 0 && r != -ENODATA) {
1137                 log_warning_errno(r, "rtnl: could not get FRA_DPORT_RANGE attribute, ignoring: %m");
1138                 return 0;
1139         }
1140
1141         (void) routing_policy_rule_get(m, tmp, &rule);
1142
1143         if (DEBUG_LOGGING) {
1144                 (void) in_addr_to_string(tmp->family, &tmp->from, &from);
1145                 (void) in_addr_to_string(tmp->family, &tmp->to, &to);
1146         }
1147
1148         switch (type) {
1149         case RTM_NEWRULE:
1150                 if (!rule) {
1151                         log_debug("Remembering foreign routing policy rule: %s/%u -> %s/%u, iif: %s, oif: %s, table: %u",
1152                                   from, tmp->from_prefixlen, to, tmp->to_prefixlen, strna(tmp->iif), strna(tmp->oif), tmp->table);
1153                         r = routing_policy_rule_add_foreign(m, tmp, &rule);
1154                         if (r < 0) {
1155                                 log_warning_errno(r, "Could not remember foreign rule, ignoring: %m");
1156                                 return 0;
1157                         }
1158                 }
1159                 break;
1160         case RTM_DELRULE:
1161                 log_debug("Forgetting routing policy rule: %s/%u -> %s/%u, iif: %s, oif: %s, table: %u",
1162                           from, tmp->from_prefixlen, to, tmp->to_prefixlen, strna(tmp->iif), strna(tmp->oif), tmp->table);
1163                 routing_policy_rule_free(rule);
1164
1165                 break;
1166
1167         default:
1168                 assert_not_reached("Received invalid RTNL message type");
1169         }
1170
1171         return 1;
1172 }
1173
1174 int manager_rtnl_process_nexthop(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) {
1175         _cleanup_(nexthop_freep) NextHop *tmp = NULL;
1176         _cleanup_free_ char *gateway = NULL;
1177         NextHop *nexthop = NULL;
1178         Manager *m = userdata;
1179         Link *link = NULL;
1180         uint16_t type;
1181         int r;
1182
1183         assert(rtnl);
1184         assert(message);
1185         assert(m);
1186
1187         if (sd_netlink_message_is_error(message)) {
1188                 r = sd_netlink_message_get_errno(message);
1189                 if (r < 0)
1190                         log_message_warning_errno(message, r, "rtnl: failed to receive rule message, ignoring");
1191
1192                 return 0;
1193         }
1194
1195         r = sd_netlink_message_get_type(message, &type);
1196         if (r < 0) {
1197                 log_warning_errno(r, "rtnl: could not get message type, ignoring: %m");
1198                 return 0;
1199         } else if (!IN_SET(type, RTM_NEWNEXTHOP, RTM_DELNEXTHOP)) {
1200                 log_warning("rtnl: received unexpected message type %u when processing nexthop, ignoring.", type);
1201                 return 0;
1202         }
1203
1204         r = nexthop_new(&tmp);
1205         if (r < 0)
1206                 return log_oom();
1207
1208         r = sd_rtnl_message_get_family(message, &tmp->family);
1209         if (r < 0) {
1210                 log_warning_errno(r, "rtnl: could not get nexthop family, ignoring: %m");
1211                 return 0;
1212         } else if (!IN_SET(tmp->family, AF_INET, AF_INET6)) {
1213                 log_debug("rtnl: received nexthop message with invalid family %d, ignoring.", tmp->family);
1214                 return 0;
1215         }
1216
1217         switch (tmp->family) {
1218         case AF_INET:
1219                 r = sd_netlink_message_read_in_addr(message, NHA_GATEWAY, &tmp->gw.in);
1220                 if (r < 0 && r != -ENODATA) {
1221                         log_warning_errno(r, "rtnl: could not get NHA_GATEWAY attribute, ignoring: %m");
1222                         return 0;
1223                 }
1224                 break;
1225
1226         case AF_INET6:
1227                 r = sd_netlink_message_read_in6_addr(message, NHA_GATEWAY, &tmp->gw.in6);
1228                 if (r < 0 && r != -ENODATA) {
1229                         log_warning_errno(r, "rtnl: could not get NHA_GATEWAY attribute, ignoring: %m");
1230                         return 0;
1231                 }
1232                 break;
1233
1234         default:
1235                 assert_not_reached("Received rule message with unsupported address family");
1236         }
1237
1238         r = sd_netlink_message_read_u32(message, NHA_ID, &tmp->id);
1239         if (r < 0 && r != -ENODATA) {
1240                 log_warning_errno(r, "rtnl: could not get NHA_ID attribute, ignoring: %m");
1241                 return 0;
1242         }
1243
1244         r = sd_netlink_message_read_u32(message, NHA_OIF, &tmp->oif);
1245         if (r < 0 && r != -ENODATA) {
1246                 log_warning_errno(r, "rtnl: could not get NHA_OIF attribute, ignoring: %m");
1247                 return 0;
1248         }
1249
1250         r = link_get(m, tmp->oif, &link);
1251         if (r < 0 || !link) {
1252                 if (!m->enumerating)
1253                         log_warning("rtnl: received nexthop message for link (%d) we do not know about, ignoring", tmp->oif);
1254                 return 0;
1255         }
1256
1257         (void) nexthop_get(link, tmp, &nexthop);
1258
1259         if (DEBUG_LOGGING)
1260                 (void) in_addr_to_string(tmp->family, &tmp->gw, &gateway);
1261
1262         switch (type) {
1263         case RTM_NEWNEXTHOP:
1264                 if (!nexthop) {
1265                         log_debug("Remembering foreign nexthop: %s, oif: %d, id: %d", gateway, tmp->oif, tmp->id);
1266                         r = nexthop_add_foreign(link, tmp, &nexthop);
1267                         if (r < 0) {
1268                                 log_warning_errno(r, "Could not remember foreign nexthop, ignoring: %m");
1269                                 return 0;
1270                         }
1271                 }
1272                 break;
1273         case RTM_DELNEXTHOP:
1274                 log_debug("Forgetting foreign nexthop: %s, oif: %d, id: %d", gateway, tmp->oif, tmp->id);
1275                 nexthop_free(nexthop);
1276
1277                 break;
1278
1279         default:
1280                 assert_not_reached("Received invalid RTNL message type");
1281         }
1282
1283         return 1;
1284 }
1285
1286 static int systemd_netlink_fd(void) {
1287         int n, fd, rtnl_fd = -EINVAL;
1288
1289         n = sd_listen_fds(true);
1290         if (n <= 0)
1291                 return -EINVAL;
1292
1293         for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd ++) {
1294                 if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1) > 0) {
1295                         if (rtnl_fd >= 0)
1296                                 return -EINVAL;
1297
1298                         rtnl_fd = fd;
1299                 }
1300         }
1301
1302         return rtnl_fd;
1303 }
1304
1305 static int manager_connect_genl(Manager *m) {
1306         int r;
1307
1308         assert(m);
1309
1310         r = sd_genl_socket_open(&m->genl);
1311         if (r < 0)
1312                 return r;
1313
1314         r = sd_netlink_inc_rcvbuf(m->genl, RCVBUF_SIZE);
1315         if (r < 0)
1316                 return r;
1317
1318         r = sd_netlink_attach_event(m->genl, m->event, 0);
1319         if (r < 0)
1320                 return r;
1321
1322         return 0;
1323 }
1324
1325 static int manager_connect_rtnl(Manager *m) {
1326         int fd, r;
1327
1328         assert(m);
1329
1330         fd = systemd_netlink_fd();
1331         if (fd < 0)
1332                 r = sd_netlink_open(&m->rtnl);
1333         else
1334                 r = sd_netlink_open_fd(&m->rtnl, fd);
1335         if (r < 0)
1336                 return r;
1337
1338         r = sd_netlink_inc_rcvbuf(m->rtnl, RCVBUF_SIZE);
1339         if (r < 0)
1340                 return r;
1341
1342         r = sd_netlink_attach_event(m->rtnl, m->event, 0);
1343         if (r < 0)
1344                 return r;
1345
1346         r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWLINK, &manager_rtnl_process_link, NULL, m, "network-rtnl_process_link");
1347         if (r < 0)
1348                 return r;
1349
1350         r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELLINK, &manager_rtnl_process_link, NULL, m, "network-rtnl_process_link");
1351         if (r < 0)
1352                 return r;
1353
1354         r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWADDR, &manager_rtnl_process_address, NULL, m, "network-rtnl_process_address");
1355         if (r < 0)
1356                 return r;
1357
1358         r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELADDR, &manager_rtnl_process_address, NULL, m, "network-rtnl_process_address");
1359         if (r < 0)
1360                 return r;
1361
1362         r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWNEIGH, &manager_rtnl_process_neighbor, NULL, m, "network-rtnl_process_neighbor");
1363         if (r < 0)
1364                 return r;
1365
1366         r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELNEIGH, &manager_rtnl_process_neighbor, NULL, m, "network-rtnl_process_neighbor");
1367         if (r < 0)
1368                 return r;
1369
1370         r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWROUTE, &manager_rtnl_process_route, NULL, m, "network-rtnl_process_route");
1371         if (r < 0)
1372                 return r;
1373
1374         r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELROUTE, &manager_rtnl_process_route, NULL, m, "network-rtnl_process_route");
1375         if (r < 0)
1376                 return r;
1377
1378         r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWRULE, &manager_rtnl_process_rule, NULL, m, "network-rtnl_process_rule");
1379         if (r < 0)
1380                 return r;
1381
1382         r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELRULE, &manager_rtnl_process_rule, NULL, m, "network-rtnl_process_rule");
1383         if (r < 0)
1384                 return r;
1385
1386         r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWNEXTHOP, &manager_rtnl_process_nexthop, NULL, m, "network-rtnl_process_nexthop");
1387         if (r < 0)
1388                 return r;
1389
1390         r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELNEXTHOP, &manager_rtnl_process_nexthop, NULL, m, "network-rtnl_process_nexthop");
1391         if (r < 0)
1392                 return r;
1393
1394         return 0;
1395 }
1396
1397 static int ordered_set_put_in_addr_data(OrderedSet *s, const struct in_addr_data *address) {
1398         char *p;
1399         int r;
1400
1401         assert(s);
1402         assert(address);
1403
1404         r = in_addr_to_string(address->family, &address->address, &p);
1405         if (r < 0)
1406                 return r;
1407
1408         r = ordered_set_consume(s, p);
1409         if (r == -EEXIST)
1410                 return 0;
1411
1412         return r;
1413 }
1414
1415 static int ordered_set_put_in_addr_datav(OrderedSet *s, const struct in_addr_data *addresses, unsigned n) {
1416         int r, c = 0;
1417         unsigned i;
1418
1419         assert(s);
1420         assert(addresses || n == 0);
1421
1422         for (i = 0; i < n; i++) {
1423                 r = ordered_set_put_in_addr_data(s, addresses+i);
1424                 if (r < 0)
1425                         return r;
1426
1427                 c += r;
1428         }
1429
1430         return c;
1431 }
1432
1433 static int ordered_set_put_in4_addr(OrderedSet *s, const struct in_addr *address) {
1434         char *p;
1435         int r;
1436
1437         assert(s);
1438         assert(address);
1439
1440         r = in_addr_to_string(AF_INET, (const union in_addr_union*) address, &p);
1441         if (r < 0)
1442                 return r;
1443
1444         r = ordered_set_consume(s, p);
1445         if (r == -EEXIST)
1446                 return 0;
1447
1448         return r;
1449 }
1450
1451 static int ordered_set_put_in4_addrv(OrderedSet *s,
1452                                      const struct in_addr *addresses,
1453                                      size_t n,
1454                                      bool (*predicate)(const struct in_addr *addr)) {
1455         int r, c = 0;
1456         size_t i;
1457
1458         assert(s);
1459         assert(n == 0 || addresses);
1460
1461         for (i = 0; i < n; i++) {
1462                 if (predicate && !predicate(&addresses[i]))
1463                         continue;
1464                 r = ordered_set_put_in4_addr(s, addresses+i);
1465                 if (r < 0)
1466                         return r;
1467
1468                 c += r;
1469         }
1470
1471         return c;
1472 }
1473
1474 static int manager_save(Manager *m) {
1475         _cleanup_ordered_set_free_free_ OrderedSet *dns = NULL, *ntp = NULL, *sip = NULL, *search_domains = NULL, *route_domains = NULL;
1476         const char *operstate_str, *carrier_state_str, *address_state_str;
1477         LinkOperationalState operstate = LINK_OPERSTATE_OFF;
1478         LinkCarrierState carrier_state = LINK_CARRIER_STATE_OFF;
1479         LinkAddressState address_state = LINK_ADDRESS_STATE_OFF;
1480         _cleanup_free_ char *temp_path = NULL;
1481         _cleanup_strv_free_ char **p = NULL;
1482         _cleanup_fclose_ FILE *f = NULL;
1483         Link *link;
1484         Iterator i;
1485         int r;
1486
1487         assert(m);
1488         assert(m->state_file);
1489
1490         /* We add all NTP and DNS server to a set, to filter out duplicates */
1491         dns = ordered_set_new(&string_hash_ops);
1492         if (!dns)
1493                 return -ENOMEM;
1494
1495         ntp = ordered_set_new(&string_hash_ops);
1496         if (!ntp)
1497                 return -ENOMEM;
1498
1499        sip = ordered_set_new(&string_hash_ops);
1500        if (!sip)
1501                 return -ENOMEM;
1502
1503         search_domains = ordered_set_new(&dns_name_hash_ops);
1504         if (!search_domains)
1505                 return -ENOMEM;
1506
1507         route_domains = ordered_set_new(&dns_name_hash_ops);
1508         if (!route_domains)
1509                 return -ENOMEM;
1510
1511         HASHMAP_FOREACH(link, m->links, i) {
1512                 if (link->flags & IFF_LOOPBACK)
1513                         continue;
1514
1515                 if (link->operstate > operstate)
1516                         operstate = link->operstate;
1517
1518                 if (link->carrier_state > carrier_state)
1519                         carrier_state = link->carrier_state;
1520
1521                 if (link->address_state > address_state)
1522                         address_state = link->address_state;
1523
1524                 if (!link->network)
1525                         continue;
1526
1527                 /* First add the static configured entries */
1528                 r = ordered_set_put_in_addr_datav(dns, link->network->dns, link->network->n_dns);
1529                 if (r < 0)
1530                         return r;
1531
1532                 r = ordered_set_put_strdupv(ntp, link->ntp ?: link->network->ntp);
1533                 if (r < 0)
1534                         return r;
1535
1536                 r = ordered_set_put_string_set(search_domains, link->search_domains ?: link->network->search_domains);
1537                 if (r < 0)
1538                         return r;
1539
1540                 r = ordered_set_put_string_set(route_domains, link->route_domains ?: link->network->route_domains);
1541                 if (r < 0)
1542                         return r;
1543
1544                 if (!link->dhcp_lease)
1545                         continue;
1546
1547                 /* Secondly, add the entries acquired via DHCP */
1548                 if (link->network->dhcp_use_dns) {
1549                         const struct in_addr *addresses;
1550
1551                         r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
1552                         if (r > 0) {
1553                                 r = ordered_set_put_in4_addrv(dns, addresses, r, in4_addr_is_non_local);
1554                                 if (r < 0)
1555                                         return r;
1556                         } else if (r < 0 && r != -ENODATA)
1557                                 return r;
1558                 }
1559
1560                 if (link->network->dhcp_use_ntp) {
1561                         const struct in_addr *addresses;
1562
1563                         r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
1564                         if (r > 0) {
1565                                 r = ordered_set_put_in4_addrv(ntp, addresses, r, in4_addr_is_non_local);
1566                                 if (r < 0)
1567                                         return r;
1568                         } else if (r < 0 && r != -ENODATA)
1569                                 return r;
1570                 }
1571
1572                 if (link->network->dhcp_use_sip) {
1573                         const struct in_addr *addresses;
1574
1575                         r = sd_dhcp_lease_get_sip(link->dhcp_lease, &addresses);
1576                         if (r > 0) {
1577                                 r = ordered_set_put_in4_addrv(sip, addresses, r, in4_addr_is_non_local);
1578                                 if (r < 0)
1579                                         return r;
1580                         } else if (r < 0 && r != -ENODATA)
1581                                 return r;
1582                 }
1583
1584                 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
1585                         const char *domainname;
1586                         char **domains = NULL;
1587
1588                         OrderedSet *target_domains = (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) ? search_domains : route_domains;
1589                         r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname);
1590                         if (r >= 0) {
1591                                 r = ordered_set_put_strdup(target_domains, domainname);
1592                                 if (r < 0)
1593                                         return r;
1594                         } else if (r != -ENODATA)
1595                                 return r;
1596
1597                         r = sd_dhcp_lease_get_search_domains(link->dhcp_lease, &domains);
1598                         if (r >= 0) {
1599                                 r = ordered_set_put_strdupv(target_domains, domains);
1600                                 if (r < 0)
1601                                         return r;
1602                         } else if (r != -ENODATA)
1603                                 return r;
1604                 }
1605         }
1606
1607         if (carrier_state >= LINK_CARRIER_STATE_ENSLAVED)
1608                 carrier_state = LINK_CARRIER_STATE_CARRIER;
1609
1610         operstate_str = link_operstate_to_string(operstate);
1611         assert(operstate_str);
1612
1613         carrier_state_str = link_carrier_state_to_string(carrier_state);
1614         assert(carrier_state_str);
1615
1616         address_state_str = link_address_state_to_string(address_state);
1617         assert(address_state_str);
1618
1619         r = fopen_temporary(m->state_file, &f, &temp_path);
1620         if (r < 0)
1621                 return r;
1622
1623         (void) fchmod(fileno(f), 0644);
1624
1625         fprintf(f,
1626                 "# This is private data. Do not parse.\n"
1627                 "OPER_STATE=%s\n"
1628                 "CARRIER_STATE=%s\n"
1629                 "ADDRESS_STATE=%s\n",
1630                 operstate_str, carrier_state_str, address_state_str);
1631
1632         ordered_set_print(f, "DNS=", dns);
1633         ordered_set_print(f, "NTP=", ntp);
1634         ordered_set_print(f, "SIP=", sip);
1635         ordered_set_print(f, "DOMAINS=", search_domains);
1636         ordered_set_print(f, "ROUTE_DOMAINS=", route_domains);
1637
1638         r = routing_policy_serialize_rules(m->rules, f);
1639         if (r < 0)
1640                 goto fail;
1641
1642         r = fflush_and_check(f);
1643         if (r < 0)
1644                 goto fail;
1645
1646         if (rename(temp_path, m->state_file) < 0) {
1647                 r = -errno;
1648                 goto fail;
1649         }
1650
1651         if (m->operational_state != operstate) {
1652                 m->operational_state = operstate;
1653                 if (strv_extend(&p, "OperationalState") < 0)
1654                         log_oom();
1655         }
1656
1657         if (m->carrier_state != carrier_state) {
1658                 m->carrier_state = carrier_state;
1659                 if (strv_extend(&p, "CarrierState") < 0)
1660                         log_oom();
1661         }
1662
1663         if (m->address_state != address_state) {
1664                 m->address_state = address_state;
1665                 if (strv_extend(&p, "AddressState") < 0)
1666                         log_oom();
1667         }
1668
1669         if (p) {
1670                 r = manager_send_changed_strv(m, p);
1671                 if (r < 0)
1672                         log_error_errno(r, "Could not emit changed properties: %m");
1673         }
1674
1675         m->dirty = false;
1676
1677         return 0;
1678
1679 fail:
1680         (void) unlink(m->state_file);
1681         (void) unlink(temp_path);
1682
1683         return log_error_errno(r, "Failed to save network state to %s: %m", m->state_file);
1684 }
1685
1686 static int manager_dirty_handler(sd_event_source *s, void *userdata) {
1687         Manager *m = userdata;
1688         Link *link;
1689         Iterator i;
1690
1691         assert(m);
1692
1693         if (m->dirty)
1694                 manager_save(m);
1695
1696         SET_FOREACH(link, m->dirty_links, i)
1697                 if (link_save(link) >= 0)
1698                         link_clean(link);
1699
1700         return 1;
1701 }
1702
1703 static int signal_terminate_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
1704         Manager *m = userdata;
1705
1706         assert(m);
1707         m->restarting = false;
1708
1709         log_debug("Terminate operation initiated.");
1710
1711         return sd_event_exit(sd_event_source_get_event(s), 0);
1712 }
1713
1714 static int signal_restart_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
1715         Manager *m = userdata;
1716
1717         assert(m);
1718         m->restarting = true;
1719
1720         log_debug("Restart operation initiated.");
1721
1722         return sd_event_exit(sd_event_source_get_event(s), 0);
1723 }
1724
1725 int manager_new(Manager **ret) {
1726         _cleanup_(manager_freep) Manager *m = NULL;
1727         int r;
1728
1729         m = new(Manager, 1);
1730         if (!m)
1731                 return -ENOMEM;
1732
1733         *m = (Manager) {
1734                 .speed_meter_interval_usec = SPEED_METER_DEFAULT_TIME_INTERVAL,
1735         };
1736
1737         m->state_file = strdup("/run/systemd/netif/state");
1738         if (!m->state_file)
1739                 return -ENOMEM;
1740
1741         r = sd_event_default(&m->event);
1742         if (r < 0)
1743                 return r;
1744
1745         assert_se(sigprocmask_many(SIG_SETMASK, NULL, SIGINT, SIGTERM, SIGUSR2, -1) >= 0);
1746
1747         (void) sd_event_set_watchdog(m->event, true);
1748         (void) sd_event_add_signal(m->event, NULL, SIGTERM, signal_terminate_callback, m);
1749         (void) sd_event_add_signal(m->event, NULL, SIGINT, signal_terminate_callback, m);
1750         (void) sd_event_add_signal(m->event, NULL, SIGUSR2, signal_restart_callback, m);
1751
1752         r = sd_event_add_post(m->event, NULL, manager_dirty_handler, m);
1753         if (r < 0)
1754                 return r;
1755
1756         r = manager_connect_rtnl(m);
1757         if (r < 0)
1758                 return r;
1759
1760         r = manager_connect_genl(m);
1761         if (r < 0)
1762                 return r;
1763
1764         r = manager_connect_udev(m);
1765         if (r < 0)
1766                 return r;
1767
1768         r = sd_resolve_default(&m->resolve);
1769         if (r < 0)
1770                 return r;
1771
1772         r = sd_resolve_attach_event(m->resolve, m->event, 0);
1773         if (r < 0)
1774                 return r;
1775
1776         r = setup_default_address_pool(m);
1777         if (r < 0)
1778                 return r;
1779
1780         m->duid.type = DUID_TYPE_EN;
1781
1782         (void) routing_policy_load_rules(m->state_file, &m->rules_saved);
1783
1784         *ret = TAKE_PTR(m);
1785
1786         return 0;
1787 }
1788
1789 void manager_free(Manager *m) {
1790         struct in6_addr *a;
1791         AddressPool *pool;
1792         Link *link;
1793
1794         if (!m)
1795                 return;
1796
1797         free(m->state_file);
1798
1799         while ((a = hashmap_first_key(m->dhcp6_prefixes)))
1800                 (void) dhcp6_prefix_remove(m, a);
1801         m->dhcp6_prefixes = hashmap_free(m->dhcp6_prefixes);
1802
1803         while ((link = hashmap_steal_first(m->links))) {
1804                 if (link->dhcp6_client)
1805                         (void) dhcp6_lease_pd_prefix_lost(link->dhcp6_client, link);
1806
1807                 (void) link_stop_clients(link, true);
1808
1809                 link_unref(link);
1810         }
1811
1812         m->dirty_links = set_free_with_destructor(m->dirty_links, link_unref);
1813         m->links_requesting_uuid = set_free_with_destructor(m->links_requesting_uuid, link_unref);
1814         m->links = hashmap_free_with_destructor(m->links, link_unref);
1815
1816         m->duids_requesting_uuid = set_free(m->duids_requesting_uuid);
1817         m->networks = ordered_hashmap_free_with_destructor(m->networks, network_unref);
1818
1819         m->netdevs = hashmap_free_with_destructor(m->netdevs, netdev_unref);
1820
1821         while ((pool = m->address_pools))
1822                 address_pool_free(pool);
1823
1824         /* routing_policy_rule_free() access m->rules and m->rules_foreign.
1825          * So, it is necessary to set NULL after the sets are freed. */
1826         m->rules = set_free_with_destructor(m->rules, routing_policy_rule_free);
1827         m->rules_foreign = set_free_with_destructor(m->rules_foreign, routing_policy_rule_free);
1828         set_free_with_destructor(m->rules_saved, routing_policy_rule_free);
1829
1830         sd_netlink_unref(m->rtnl);
1831         sd_netlink_unref(m->genl);
1832         sd_resolve_unref(m->resolve);
1833
1834         sd_event_source_unref(m->speed_meter_event_source);
1835         sd_event_unref(m->event);
1836
1837         sd_device_monitor_unref(m->device_monitor);
1838
1839         bus_verify_polkit_async_registry_free(m->polkit_registry);
1840         sd_bus_flush_close_unref(m->bus);
1841
1842         free(m->dynamic_timezone);
1843         free(m->dynamic_hostname);
1844
1845         free(m);
1846 }
1847
1848 int manager_start(Manager *m) {
1849         Link *link;
1850         Iterator i;
1851         int r;
1852
1853         assert(m);
1854
1855         r = manager_start_speed_meter(m);
1856         if (r < 0)
1857                 return log_error_errno(r, "Failed to initialize speed meter: %m");
1858
1859         /* The dirty handler will deal with future serialization, but the first one
1860            must be done explicitly. */
1861
1862         manager_save(m);
1863
1864         HASHMAP_FOREACH(link, m->links, i)
1865                 link_save(link);
1866
1867         return 0;
1868 }
1869
1870 int manager_load_config(Manager *m) {
1871         int r;
1872
1873         /* update timestamp */
1874         paths_check_timestamp(NETWORK_DIRS, &m->network_dirs_ts_usec, true);
1875
1876         r = netdev_load(m, false);
1877         if (r < 0)
1878                 return r;
1879
1880         r = network_load(m, &m->networks);
1881         if (r < 0)
1882                 return r;
1883
1884         return 0;
1885 }
1886
1887 bool manager_should_reload(Manager *m) {
1888         return paths_check_timestamp(NETWORK_DIRS, &m->network_dirs_ts_usec, false);
1889 }
1890
1891 int manager_rtnl_enumerate_links(Manager *m) {
1892         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
1893         sd_netlink_message *link;
1894         int r;
1895
1896         assert(m);
1897         assert(m->rtnl);
1898
1899         r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
1900         if (r < 0)
1901                 return r;
1902
1903         r = sd_netlink_message_request_dump(req, true);
1904         if (r < 0)
1905                 return r;
1906
1907         r = sd_netlink_call(m->rtnl, req, 0, &reply);
1908         if (r < 0)
1909                 return r;
1910
1911         for (link = reply; link; link = sd_netlink_message_next(link)) {
1912                 int k;
1913
1914                 m->enumerating = true;
1915
1916                 k = manager_rtnl_process_link(m->rtnl, link, m);
1917                 if (k < 0)
1918                         r = k;
1919
1920                 m->enumerating = false;
1921         }
1922
1923         return r;
1924 }
1925
1926 int manager_rtnl_enumerate_addresses(Manager *m) {
1927         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
1928         sd_netlink_message *addr;
1929         int r;
1930
1931         assert(m);
1932         assert(m->rtnl);
1933
1934         r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, 0);
1935         if (r < 0)
1936                 return r;
1937
1938         r = sd_netlink_message_request_dump(req, true);
1939         if (r < 0)
1940                 return r;
1941
1942         r = sd_netlink_call(m->rtnl, req, 0, &reply);
1943         if (r < 0)
1944                 return r;
1945
1946         for (addr = reply; addr; addr = sd_netlink_message_next(addr)) {
1947                 int k;
1948
1949                 m->enumerating = true;
1950
1951                 k = manager_rtnl_process_address(m->rtnl, addr, m);
1952                 if (k < 0)
1953                         r = k;
1954
1955                 m->enumerating = false;
1956         }
1957
1958         return r;
1959 }
1960
1961 int manager_rtnl_enumerate_neighbors(Manager *m) {
1962         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
1963         sd_netlink_message *neigh;
1964         int r;
1965
1966         assert(m);
1967         assert(m->rtnl);
1968
1969         r = sd_rtnl_message_new_neigh(m->rtnl, &req, RTM_GETNEIGH, 0, AF_UNSPEC);
1970         if (r < 0)
1971                 return r;
1972
1973         r = sd_netlink_message_request_dump(req, true);
1974         if (r < 0)
1975                 return r;
1976
1977         r = sd_netlink_call(m->rtnl, req, 0, &reply);
1978         if (r < 0)
1979                 return r;
1980
1981         for (neigh = reply; neigh; neigh = sd_netlink_message_next(neigh)) {
1982                 int k;
1983
1984                 m->enumerating = true;
1985
1986                 k = manager_rtnl_process_neighbor(m->rtnl, neigh, m);
1987                 if (k < 0)
1988                         r = k;
1989
1990                 m->enumerating = false;
1991         }
1992
1993         return r;
1994 }
1995
1996 int manager_rtnl_enumerate_routes(Manager *m) {
1997         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
1998         sd_netlink_message *route;
1999         int r;
2000
2001         assert(m);
2002         assert(m->rtnl);
2003
2004         r = sd_rtnl_message_new_route(m->rtnl, &req, RTM_GETROUTE, 0, 0);
2005         if (r < 0)
2006                 return r;
2007
2008         r = sd_netlink_message_request_dump(req, true);
2009         if (r < 0)
2010                 return r;
2011
2012         r = sd_netlink_call(m->rtnl, req, 0, &reply);
2013         if (r < 0)
2014                 return r;
2015
2016         for (route = reply; route; route = sd_netlink_message_next(route)) {
2017                 int k;
2018
2019                 m->enumerating = true;
2020
2021                 k = manager_rtnl_process_route(m->rtnl, route, m);
2022                 if (k < 0)
2023                         r = k;
2024
2025                 m->enumerating = false;
2026         }
2027
2028         return r;
2029 }
2030
2031 int manager_rtnl_enumerate_rules(Manager *m) {
2032         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
2033         sd_netlink_message *rule;
2034         int r;
2035
2036         assert(m);
2037         assert(m->rtnl);
2038
2039         r = sd_rtnl_message_new_routing_policy_rule(m->rtnl, &req, RTM_GETRULE, 0);
2040         if (r < 0)
2041                 return r;
2042
2043         r = sd_netlink_message_request_dump(req, true);
2044         if (r < 0)
2045                 return r;
2046
2047         r = sd_netlink_call(m->rtnl, req, 0, &reply);
2048         if (r < 0) {
2049                 if (r == -EOPNOTSUPP) {
2050                         log_debug("FIB Rules are not supported by the kernel. Ignoring.");
2051                         return 0;
2052                 }
2053
2054                 return r;
2055         }
2056
2057         for (rule = reply; rule; rule = sd_netlink_message_next(rule)) {
2058                 int k;
2059
2060                 m->enumerating = true;
2061
2062                 k = manager_rtnl_process_rule(m->rtnl, rule, m);
2063                 if (k < 0)
2064                         r = k;
2065
2066                 m->enumerating = false;
2067         }
2068
2069         return r;
2070 }
2071
2072 int manager_rtnl_enumerate_nexthop(Manager *m) {
2073         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
2074         sd_netlink_message *nexthop;
2075         int r;
2076
2077         assert(m);
2078         assert(m->rtnl);
2079
2080         r = sd_rtnl_message_new_nexthop(m->rtnl, &req, RTM_GETNEXTHOP, 0, 0);
2081         if (r < 0)
2082                 return r;
2083
2084         r = sd_netlink_message_request_dump(req, true);
2085         if (r < 0)
2086                 return r;
2087
2088         r = sd_netlink_call(m->rtnl, req, 0, &reply);
2089         if (r < 0) {
2090                 if (r == -EOPNOTSUPP) {
2091                         log_debug("Nexthop are not supported by the kernel. Ignoring.");
2092                         return 0;
2093                 }
2094
2095                 return r;
2096         }
2097
2098         for (nexthop = reply; nexthop; nexthop = sd_netlink_message_next(nexthop)) {
2099                 int k;
2100
2101                 m->enumerating = true;
2102
2103                 k = manager_rtnl_process_nexthop(m->rtnl, nexthop, m);
2104                 if (k < 0)
2105                         r = k;
2106
2107                 m->enumerating = false;
2108         }
2109
2110         return r;
2111 }
2112
2113 int manager_address_pool_acquire(Manager *m, int family, unsigned prefixlen, union in_addr_union *found) {
2114         AddressPool *p;
2115         int r;
2116
2117         assert(m);
2118         assert(prefixlen > 0);
2119         assert(found);
2120
2121         LIST_FOREACH(address_pools, p, m->address_pools) {
2122                 if (p->family != family)
2123                         continue;
2124
2125                 r = address_pool_acquire(p, prefixlen, found);
2126                 if (r != 0)
2127                         return r;
2128         }
2129
2130         return 0;
2131 }
2132
2133 Link* manager_find_uplink(Manager *m, Link *exclude) {
2134         _cleanup_free_ struct local_address *gateways = NULL;
2135         int n, i;
2136
2137         assert(m);
2138
2139         /* Looks for a suitable "uplink", via black magic: an
2140          * interface that is up and where the default route with the
2141          * highest priority points to. */
2142
2143         n = local_gateways(m->rtnl, 0, AF_UNSPEC, &gateways);
2144         if (n < 0) {
2145                 log_warning_errno(n, "Failed to determine list of default gateways: %m");
2146                 return NULL;
2147         }
2148
2149         for (i = 0; i < n; i++) {
2150                 Link *link;
2151
2152                 link = hashmap_get(m->links, INT_TO_PTR(gateways[i].ifindex));
2153                 if (!link) {
2154                         log_debug("Weird, found a gateway for a link we don't know. Ignoring.");
2155                         continue;
2156                 }
2157
2158                 if (link == exclude)
2159                         continue;
2160
2161                 if (link->operstate < LINK_OPERSTATE_ROUTABLE)
2162                         continue;
2163
2164                 return link;
2165         }
2166
2167         return NULL;
2168 }
2169
2170 void manager_dirty(Manager *manager) {
2171         assert(manager);
2172
2173         /* the serialized state in /run is no longer up-to-date */
2174         manager->dirty = true;
2175 }
2176
2177 static int set_hostname_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2178         Manager *manager = userdata;
2179         const sd_bus_error *e;
2180
2181         assert(m);
2182         assert(manager);
2183
2184         e = sd_bus_message_get_error(m);
2185         if (e)
2186                 log_warning_errno(sd_bus_error_get_errno(e), "Could not set hostname: %s", e->message);
2187
2188         return 1;
2189 }
2190
2191 int manager_set_hostname(Manager *m, const char *hostname) {
2192         int r;
2193
2194         log_debug("Setting transient hostname: '%s'", strna(hostname));
2195
2196         if (free_and_strdup(&m->dynamic_hostname, hostname) < 0)
2197                 return log_oom();
2198
2199         if (!m->bus || sd_bus_is_ready(m->bus) <= 0) {
2200                 log_debug("Not connected to system bus, setting hostname later.");
2201                 return 0;
2202         }
2203
2204         r = sd_bus_call_method_async(
2205                         m->bus,
2206                         NULL,
2207                         "org.freedesktop.hostname1",
2208                         "/org/freedesktop/hostname1",
2209                         "org.freedesktop.hostname1",
2210                         "SetHostname",
2211                         set_hostname_handler,
2212                         m,
2213                         "sb",
2214                         hostname,
2215                         false);
2216
2217         if (r < 0)
2218                 return log_error_errno(r, "Could not set transient hostname: %m");
2219
2220         return 0;
2221 }
2222
2223 static int set_timezone_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2224         Manager *manager = userdata;
2225         const sd_bus_error *e;
2226
2227         assert(m);
2228         assert(manager);
2229
2230         e = sd_bus_message_get_error(m);
2231         if (e)
2232                 log_warning_errno(sd_bus_error_get_errno(e), "Could not set timezone: %s", e->message);
2233
2234         return 1;
2235 }
2236
2237 int manager_set_timezone(Manager *m, const char *tz) {
2238         int r;
2239
2240         assert(m);
2241         assert(tz);
2242
2243         log_debug("Setting system timezone: '%s'", tz);
2244         if (free_and_strdup(&m->dynamic_timezone, tz) < 0)
2245                 return log_oom();
2246
2247         if (!m->bus || sd_bus_is_ready(m->bus) <= 0) {
2248                 log_debug("Not connected to system bus, setting timezone later.");
2249                 return 0;
2250         }
2251
2252         r = sd_bus_call_method_async(
2253                         m->bus,
2254                         NULL,
2255                         "org.freedesktop.timedate1",
2256                         "/org/freedesktop/timedate1",
2257                         "org.freedesktop.timedate1",
2258                         "SetTimezone",
2259                         set_timezone_handler,
2260                         m,
2261                         "sb",
2262                         tz,
2263                         false);
2264         if (r < 0)
2265                 return log_error_errno(r, "Could not set timezone: %m");
2266
2267         return 0;
2268 }
2269
2270 int manager_request_product_uuid(Manager *m, Link *link) {
2271         int r;
2272
2273         assert(m);
2274
2275         if (m->has_product_uuid)
2276                 return 0;
2277
2278         log_debug("Requesting product UUID");
2279
2280         if (link) {
2281                 DUID *duid;
2282
2283                 assert_se(duid = link_get_duid(link));
2284
2285                 r = set_ensure_allocated(&m->links_requesting_uuid, NULL);
2286                 if (r < 0)
2287                         return log_oom();
2288
2289                 r = set_ensure_allocated(&m->duids_requesting_uuid, NULL);
2290                 if (r < 0)
2291                         return log_oom();
2292
2293                 r = set_put(m->links_requesting_uuid, link);
2294                 if (r < 0)
2295                         return log_oom();
2296
2297                 r = set_put(m->duids_requesting_uuid, duid);
2298                 if (r < 0)
2299                         return log_oom();
2300
2301                 link_ref(link);
2302         }
2303
2304         if (!m->bus || sd_bus_is_ready(m->bus) <= 0) {
2305                 log_debug("Not connected to system bus, requesting product UUID later.");
2306                 return 0;
2307         }
2308
2309         r = sd_bus_call_method_async(
2310                         m->bus,
2311                         NULL,
2312                         "org.freedesktop.hostname1",
2313                         "/org/freedesktop/hostname1",
2314                         "org.freedesktop.hostname1",
2315                         "GetProductUUID",
2316                         get_product_uuid_handler,
2317                         m,
2318                         "b",
2319                         false);
2320         if (r < 0)
2321                 return log_warning_errno(r, "Failed to get product UUID: %m");
2322
2323         return 0;
2324 }