src/network/networkd-manager.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2013 Tom Gundersen <teg@jklm.no>
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18  ***/
  19
  20 #include <sys/socket.h>
  21 #include <linux/if.h>
  22
  23 #include "sd-daemon.h"
  24 #include "sd-netlink.h"
  25
  26 #include "alloc-util.h"
  27 #include "bus-util.h"
  28 #include "conf-parser.h"
  29 #include "def.h"
  30 #include "dns-domain.h"
  31 #include "fd-util.h"
  32 #include "fileio.h"
  33 #include "libudev-private.h"
  34 #include "local-addresses.h"
  35 #include "netlink-util.h"
  36 #include "networkd.h"
  37 #include "ordered-set.h"
  38 #include "path-util.h"
  39 #include "set.h"
  40 #include "udev-util.h"
  41 #include "virt.h"
  42
  43 /* use 8 MB for receive socket kernel queue. */
  44 #define RCVBUF_SIZE    (8*1024*1024)
  45
  46 const char* const network_dirs[] = {
  47         "/etc/systemd/network",
  48         "/run/systemd/network",
  49         "/usr/lib/systemd/network",
  50 #ifdef HAVE_SPLIT_USR
  51         "/lib/systemd/network",
  52 #endif
  53         NULL};
  54
  55 static int setup_default_address_pool(Manager *m) {
  56         AddressPool *p;
  57         int r;
  58
  59         assert(m);
  60
  61         /* Add in the well-known private address ranges. */
  62
  63         r = address_pool_new_from_string(m, &p, AF_INET6, "fc00::", 7);
  64         if (r < 0)
  65                 return r;
  66
  67         r = address_pool_new_from_string(m, &p, AF_INET, "192.168.0.0", 16);
  68         if (r < 0)
  69                 return r;
  70
  71         r = address_pool_new_from_string(m, &p, AF_INET, "172.16.0.0", 12);
  72         if (r < 0)
  73                 return r;
  74
  75         r = address_pool_new_from_string(m, &p, AF_INET, "10.0.0.0", 8);
  76         if (r < 0)
  77                 return r;
  78
  79         return 0;
  80 }
  81
  82 static int on_bus_retry(sd_event_source *s, usec_t usec, void *userdata) {
  83         Manager *m = userdata;
  84
  85         assert(s);
  86         assert(m);
  87
  88         m->bus_retry_event_source = sd_event_source_unref(m->bus_retry_event_source);
  89
  90         manager_connect_bus(m);
  91
  92         return 0;
  93 }
  94
  95 static int manager_reset_all(Manager *m) {
  96         Link *link;
  97         Iterator i;
  98         int r;
  99
 100         assert(m);
 101
 102         HASHMAP_FOREACH(link, m->links, i) {
 103                 r = link_carrier_reset(link);
 104                 if (r < 0)
 105                         log_link_warning_errno(link, r, "Could not reset carrier: %m");
 106         }
 107
 108         return 0;
 109 }
 110
 111 static int match_prepare_for_sleep(sd_bus_message *message, void *userdata, sd_bus_error *ret_error) {
 112         Manager *m = userdata;
 113         int b, r;
 114
 115         assert(message);
 116
 117         r = sd_bus_message_read(message, "b", &b);
 118         if (r < 0) {
 119                 log_debug_errno(r, "Failed to parse PrepareForSleep signal: %m");
 120                 return 0;
 121         }
 122
 123         if (b)
 124                 return 0;
 125
 126         log_debug("Coming back from suspend, resetting all connections...");
 127
 128         manager_reset_all(m);
 129
 130         return 0;
 131 }
 132
 133 int manager_connect_bus(Manager *m) {
 134         int r;
 135
 136         assert(m);
 137
 138         r = sd_bus_default_system(&m->bus);
 139         if (r == -ENOENT) {
 140                 /* We failed to connect? Yuck, we must be in early
 141                  * boot. Let's try in 5s again. As soon as we have
 142                  * kdbus we can stop doing this... */
 143
 144                 log_debug_errno(r, "Failed to connect to bus, trying again in 5s: %m");
 145
 146                 r = sd_event_add_time(m->event, &m->bus_retry_event_source, CLOCK_MONOTONIC, now(CLOCK_MONOTONIC) + 5*USEC_PER_SEC, 0, on_bus_retry, m);
 147                 if (r < 0)
 148                         return log_error_errno(r, "Failed to install bus reconnect time event: %m");
 149
 150                 return 0;
 151         }
 152
 153         if (r < 0)
 154                 return r;
 155
 156         r = sd_bus_add_match(m->bus, &m->prepare_for_sleep_slot,
 157                              "type='signal',"
 158                              "sender='org.freedesktop.login1',"
 159                              "interface='org.freedesktop.login1.Manager',"
 160                              "member='PrepareForSleep',"
 161                              "path='/org/freedesktop/login1'",
 162                              match_prepare_for_sleep,
 163                              m);
 164         if (r < 0)
 165                 return log_error_errno(r, "Failed to add match for PrepareForSleep: %m");
 166
 167         r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/network1", "org.freedesktop.network1.Manager", manager_vtable, m);
 168         if (r < 0)
 169                 return log_error_errno(r, "Failed to add manager object vtable: %m");
 170
 171         r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/network1/link", "org.freedesktop.network1.Link", link_vtable, link_object_find, m);
 172         if (r < 0)
 173                return log_error_errno(r, "Failed to add link object vtable: %m");
 174
 175         r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/network1/link", link_node_enumerator, m);
 176         if (r < 0)
 177                 return log_error_errno(r, "Failed to add link enumerator: %m");
 178
 179         r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/network1/network", "org.freedesktop.network1.Network", network_vtable, network_object_find, m);
 180         if (r < 0)
 181                return log_error_errno(r, "Failed to add network object vtable: %m");
 182
 183         r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/network1/network", network_node_enumerator, m);
 184         if (r < 0)
 185                 return log_error_errno(r, "Failed to add network enumerator: %m");
 186
 187         r = sd_bus_request_name(m->bus, "org.freedesktop.network1", 0);
 188         if (r < 0)
 189                 return log_error_errno(r, "Failed to register name: %m");
 190
 191         r = sd_bus_attach_event(m->bus, m->event, 0);
 192         if (r < 0)
 193                 return log_error_errno(r, "Failed to attach bus to event loop: %m");
 194
 195         return 0;
 196 }
 197
 198 static int manager_udev_process_link(Manager *m, struct udev_device *device) {
 199         Link *link = NULL;
 200         int r, ifindex;
 201
 202         assert(m);
 203         assert(device);
 204
 205         if (!streq_ptr(udev_device_get_action(device), "add"))
 206                 return 0;
 207
 208         ifindex = udev_device_get_ifindex(device);
 209         if (ifindex <= 0) {
 210                 log_debug("Ignoring udev ADD event for device with invalid ifindex");
 211                 return 0;
 212         }
 213
 214         r = link_get(m, ifindex, &link);
 215         if (r == -ENODEV)
 216                 return 0;
 217         else if (r < 0)
 218                 return r;
 219
 220         r = link_initialized(link, device);
 221         if (r < 0)
 222                 return r;
 223
 224         return 0;
 225 }
 226
 227 static int manager_dispatch_link_udev(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
 228         Manager *m = userdata;
 229         struct udev_monitor *monitor = m->udev_monitor;
 230         _cleanup_udev_device_unref_ struct udev_device *device = NULL;
 231
 232         device = udev_monitor_receive_device(monitor);
 233         if (!device)
 234                 return -ENOMEM;
 235
 236         manager_udev_process_link(m, device);
 237         return 0;
 238 }
 239
 240 static int manager_connect_udev(Manager *m) {
 241         int r;
 242
 243         /* udev does not initialize devices inside containers,
 244          * so we rely on them being already initialized before
 245          * entering the container */
 246         if (detect_container() > 0)
 247                 return 0;
 248
 249         m->udev = udev_new();
 250         if (!m->udev)
 251                 return -ENOMEM;
 252
 253         m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
 254         if (!m->udev_monitor)
 255                 return -ENOMEM;
 256
 257         r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "net", NULL);
 258         if (r < 0)
 259                 return log_error_errno(r, "Could not add udev monitor filter: %m");
 260
 261         r = udev_monitor_enable_receiving(m->udev_monitor);
 262         if (r < 0) {
 263                 log_error("Could not enable udev monitor");
 264                 return r;
 265         }
 266
 267         r = sd_event_add_io(m->event,
 268                         &m->udev_event_source,
 269                         udev_monitor_get_fd(m->udev_monitor),
 270                         EPOLLIN, manager_dispatch_link_udev,
 271                         m);
 272         if (r < 0)
 273                 return r;
 274
 275         r = sd_event_source_set_description(m->udev_event_source, "networkd-udev");
 276         if (r < 0)
 277                 return r;
 278
 279         return 0;
 280 }
 281
 282 int manager_rtnl_process_route(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) {
 283         Manager *m = userdata;
 284         Link *link = NULL;
 285         uint16_t type;
 286         uint32_t ifindex, priority = 0;
 287         unsigned char protocol, scope, tos, table;
 288         int family;
 289         unsigned char dst_prefixlen, src_prefixlen;
 290         union in_addr_union dst = {}, gw = {}, src = {}, prefsrc = {};
 291         Route *route = NULL;
 292         int r;
 293
 294         assert(rtnl);
 295         assert(message);
 296         assert(m);
 297
 298         if (sd_netlink_message_is_error(message)) {
 299                 r = sd_netlink_message_get_errno(message);
 300                 if (r < 0)
 301                         log_warning_errno(r, "rtnl: failed to receive route: %m");
 302
 303                 return 0;
 304         }
 305
 306         r = sd_netlink_message_get_type(message, &type);
 307         if (r < 0) {
 308                 log_warning_errno(r, "rtnl: could not get message type: %m");
 309                 return 0;
 310         } else if (type != RTM_NEWROUTE && type != RTM_DELROUTE) {
 311                 log_warning("rtnl: received unexpected message type when processing route");
 312                 return 0;
 313         }
 314
 315         r = sd_netlink_message_read_u32(message, RTA_OIF, &ifindex);
 316         if (r == -ENODATA) {
 317                 log_debug("rtnl: received route without ifindex, ignoring");
 318                 return 0;
 319         } else if (r < 0) {
 320                 log_warning_errno(r, "rtnl: could not get ifindex from route, ignoring: %m");
 321                 return 0;
 322         } else if (ifindex <= 0) {
 323                 log_warning("rtnl: received route message with invalid ifindex, ignoring: %d", ifindex);
 324                 return 0;
 325         } else {
 326                 r = link_get(m, ifindex, &link);
 327                 if (r < 0 || !link) {
 328                         /* when enumerating we might be out of sync, but we will
 329                          * get the route again, so just ignore it */
 330                         if (!m->enumerating)
 331                                 log_warning("rtnl: received route for nonexistent link (%d), ignoring", ifindex);
 332                         return 0;
 333                 }
 334         }
 335
 336         r = sd_rtnl_message_route_get_family(message, &family);
 337         if (r < 0 || !IN_SET(family, AF_INET, AF_INET6)) {
 338                 log_link_warning(link, "rtnl: received address with invalid family, ignoring.");
 339                 return 0;
 340         }
 341
 342         r = sd_rtnl_message_route_get_protocol(message, &protocol);
 343         if (r < 0) {
 344                 log_warning_errno(r, "rtnl: could not get route protocol: %m");
 345                 return 0;
 346         }
 347
 348         switch (family) {
 349         case AF_INET:
 350                 r = sd_netlink_message_read_in_addr(message, RTA_DST, &dst.in);
 351                 if (r < 0 && r != -ENODATA) {
 352                         log_link_warning_errno(link, r, "rtnl: received route without valid destination, ignoring: %m");
 353                         return 0;
 354                 }
 355
 356                 r = sd_netlink_message_read_in_addr(message, RTA_GATEWAY, &gw.in);
 357                 if (r < 0 && r != -ENODATA) {
 358                         log_link_warning_errno(link, r, "rtnl: received route with invalid gateway, ignoring: %m");
 359                         return 0;
 360                 }
 361
 362                 r = sd_netlink_message_read_in_addr(message, RTA_SRC, &src.in);
 363                 if (r < 0 && r != -ENODATA) {
 364                         log_link_warning_errno(link, r, "rtnl: received route with invalid source, ignoring: %m");
 365                         return 0;
 366                 }
 367
 368                 r = sd_netlink_message_read_in_addr(message, RTA_PREFSRC, &prefsrc.in);
 369                 if (r < 0 && r != -ENODATA) {
 370                         log_link_warning_errno(link, r, "rtnl: received route with invalid preferred source, ignoring: %m");
 371                         return 0;
 372                 }
 373
 374                 break;
 375
 376         case AF_INET6:
 377                 r = sd_netlink_message_read_in6_addr(message, RTA_DST, &dst.in6);
 378                 if (r < 0 && r != -ENODATA) {
 379                         log_link_warning_errno(link, r, "rtnl: received route without valid destination, ignoring: %m");
 380                         return 0;
 381                 }
 382
 383                 r = sd_netlink_message_read_in6_addr(message, RTA_GATEWAY, &gw.in6);
 384                 if (r < 0 && r != -ENODATA) {
 385                         log_link_warning_errno(link, r, "rtnl: received route with invalid gateway, ignoring: %m");
 386                         return 0;
 387                 }
 388
 389                 r = sd_netlink_message_read_in6_addr(message, RTA_SRC, &src.in6);
 390                 if (r < 0 && r != -ENODATA) {
 391                         log_link_warning_errno(link, r, "rtnl: received route with invalid source, ignoring: %m");
 392                         return 0;
 393                 }
 394
 395                 r = sd_netlink_message_read_in6_addr(message, RTA_PREFSRC, &prefsrc.in6);
 396                 if (r < 0 && r != -ENODATA) {
 397                         log_link_warning_errno(link, r, "rtnl: received route with invalid preferred source, ignoring: %m");
 398                         return 0;
 399                 }
 400
 401                 break;
 402
 403         default:
 404                 log_link_debug(link, "rtnl: ignoring unsupported address family: %d", family);
 405                 return 0;
 406         }
 407
 408         r = sd_rtnl_message_route_get_dst_prefixlen(message, &dst_prefixlen);
 409         if (r < 0) {
 410                 log_link_warning_errno(link, r, "rtnl: received route with invalid destination prefixlen, ignoring: %m");
 411                 return 0;
 412         }
 413
 414         r = sd_rtnl_message_route_get_src_prefixlen(message, &src_prefixlen);
 415         if (r < 0) {
 416                 log_link_warning_errno(link, r, "rtnl: received route with invalid source prefixlen, ignoring: %m");
 417                 return 0;
 418         }
 419
 420         r = sd_rtnl_message_route_get_scope(message, &scope);
 421         if (r < 0) {
 422                 log_link_warning_errno(link, r, "rtnl: received route with invalid scope, ignoring: %m");
 423                 return 0;
 424         }
 425
 426         r = sd_rtnl_message_route_get_tos(message, &tos);
 427         if (r < 0) {
 428                 log_link_warning_errno(link, r, "rtnl: received route with invalid tos, ignoring: %m");
 429                 return 0;
 430         }
 431
 432         r = sd_rtnl_message_route_get_table(message, &table);
 433         if (r < 0) {
 434                 log_link_warning_errno(link, r, "rtnl: received route with invalid table, ignoring: %m");
 435                 return 0;
 436         }
 437
 438         r = sd_netlink_message_read_u32(message, RTA_PRIORITY, &priority);
 439         if (r < 0 && r != -ENODATA) {
 440                 log_link_warning_errno(link, r, "rtnl: received route with invalid priority, ignoring: %m");
 441                 return 0;
 442         }
 443
 444         route_get(link, family, &dst, dst_prefixlen, tos, priority, table, &route);
 445
 446         switch (type) {
 447         case RTM_NEWROUTE:
 448                 if (!route) {
 449                         /* A route appeared that we did not request */
 450                         r = route_add_foreign(link, family, &dst, dst_prefixlen, tos, priority, table, &route);
 451                         if (r < 0)
 452                                 return 0;
 453                 }
 454
 455                 route_update(route, &src, src_prefixlen, &gw, &prefsrc, scope, protocol);
 456
 457                 break;
 458
 459         case RTM_DELROUTE:
 460
 461                 if (route)
 462                         route_drop(route);
 463
 464                 break;
 465         default:
 466                 assert_not_reached("Received invalid RTNL message type");
 467         }
 468
 469         return 1;
 470 }
 471
 472 int manager_rtnl_process_address(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) {
 473         Manager *m = userdata;
 474         Link *link = NULL;
 475         uint16_t type;
 476         unsigned char flags;
 477         int family;
 478         unsigned char prefixlen;
 479         unsigned char scope;
 480         union in_addr_union in_addr;
 481         struct ifa_cacheinfo cinfo;
 482         Address *address = NULL;
 483         char buf[INET6_ADDRSTRLEN], valid_buf[FORMAT_TIMESPAN_MAX];
 484         const char *valid_str = NULL;
 485         int r, ifindex;
 486
 487         assert(rtnl);
 488         assert(message);
 489         assert(m);
 490
 491         if (sd_netlink_message_is_error(message)) {
 492                 r = sd_netlink_message_get_errno(message);
 493                 if (r < 0)
 494                         log_warning_errno(r, "rtnl: failed to receive address: %m");
 495
 496                 return 0;
 497         }
 498
 499         r = sd_netlink_message_get_type(message, &type);
 500         if (r < 0) {
 501                 log_warning_errno(r, "rtnl: could not get message type: %m");
 502                 return 0;
 503         } else if (type != RTM_NEWADDR && type != RTM_DELADDR) {
 504                 log_warning("rtnl: received unexpected message type when processing address");
 505                 return 0;
 506         }
 507
 508         r = sd_rtnl_message_addr_get_ifindex(message, &ifindex);
 509         if (r < 0) {
 510                 log_warning_errno(r, "rtnl: could not get ifindex from address: %m");
 511                 return 0;
 512         } else if (ifindex <= 0) {
 513                 log_warning("rtnl: received address message with invalid ifindex: %d", ifindex);
 514                 return 0;
 515         } else {
 516                 r = link_get(m, ifindex, &link);
 517                 if (r < 0 || !link) {
 518                         /* when enumerating we might be out of sync, but we will
 519                          * get the address again, so just ignore it */
 520                         if (!m->enumerating)
 521                                 log_warning("rtnl: received address for nonexistent link (%d), ignoring", ifindex);
 522                         return 0;
 523                 }
 524         }
 525
 526         r = sd_rtnl_message_addr_get_family(message, &family);
 527         if (r < 0 || !IN_SET(family, AF_INET, AF_INET6)) {
 528                 log_link_warning(link, "rtnl: received address with invalid family, ignoring.");
 529                 return 0;
 530         }
 531
 532         r = sd_rtnl_message_addr_get_prefixlen(message, &prefixlen);
 533         if (r < 0) {
 534                 log_link_warning_errno(link, r, "rtnl: received address with invalid prefixlen, ignoring: %m");
 535                 return 0;
 536         }
 537
 538         r = sd_rtnl_message_addr_get_scope(message, &scope);
 539         if (r < 0) {
 540                 log_link_warning_errno(link, r, "rtnl: received address with invalid scope, ignoring: %m");
 541                 return 0;
 542         }
 543
 544         r = sd_rtnl_message_addr_get_flags(message, &flags);
 545         if (r < 0) {
 546                 log_link_warning_errno(link, r, "rtnl: received address with invalid flags, ignoring: %m");
 547                 return 0;
 548         }
 549
 550         switch (family) {
 551         case AF_INET:
 552                 r = sd_netlink_message_read_in_addr(message, IFA_LOCAL, &in_addr.in);
 553                 if (r < 0) {
 554                         log_link_warning_errno(link, r, "rtnl: received address without valid address, ignoring: %m");
 555                         return 0;
 556                 }
 557
 558                 break;
 559
 560         case AF_INET6:
 561                 r = sd_netlink_message_read_in6_addr(message, IFA_ADDRESS, &in_addr.in6);
 562                 if (r < 0) {
 563                         log_link_warning_errno(link, r, "rtnl: received address without valid address, ignoring: %m");
 564                         return 0;
 565                 }
 566
 567                 break;
 568
 569         default:
 570                 log_link_debug(link, "rtnl: ignoring unsupported address family: %d", family);
 571         }
 572
 573         if (!inet_ntop(family, &in_addr, buf, INET6_ADDRSTRLEN)) {
 574                 log_link_warning(link, "Could not print address");
 575                 return 0;
 576         }
 577
 578         r = sd_netlink_message_read_cache_info(message, IFA_CACHEINFO, &cinfo);
 579         if (r >= 0) {
 580                 if (cinfo.ifa_valid != CACHE_INFO_INFINITY_LIFE_TIME)
 581                         valid_str = format_timespan(valid_buf, FORMAT_TIMESPAN_MAX,
 582                                                     cinfo.ifa_valid * USEC_PER_SEC,
 583                                                     USEC_PER_SEC);
 584         }
 585
 586         address_get(link, family, &in_addr, prefixlen, &address);
 587
 588         switch (type) {
 589         case RTM_NEWADDR:
 590                 if (address)
 591                         log_link_debug(link, "Updating address: %s/%u (valid %s%s)", buf, prefixlen,
 592                                        valid_str ? "for " : "forever", valid_str ?: "");
 593                 else {
 594                         /* An address appeared that we did not request */
 595                         r = address_add_foreign(link, family, &in_addr, prefixlen, &address);
 596                         if (r < 0) {
 597                                 log_link_warning_errno(link, r, "Failed to add address %s/%u: %m", buf, prefixlen);
 598                                 return 0;
 599                         } else
 600                                 log_link_debug(link, "Adding address: %s/%u (valid %s%s)", buf, prefixlen,
 601                                                valid_str ? "for " : "forever", valid_str ?: "");
 602                 }
 603
 604                 address_update(address, flags, scope, &cinfo);
 605
 606                 break;
 607
 608         case RTM_DELADDR:
 609
 610                 if (address) {
 611                         log_link_debug(link, "Removing address: %s/%u (valid %s%s)", buf, prefixlen,
 612                                        valid_str ? "for " : "forever", valid_str ?: "");
 613                         address_drop(address);
 614                 } else
 615                         log_link_warning(link, "Removing non-existent address: %s/%u (valid %s%s)", buf, prefixlen,
 616                                          valid_str ? "for " : "forever", valid_str ?: "");
 617
 618                 break;
 619         default:
 620                 assert_not_reached("Received invalid RTNL message type");
 621         }
 622
 623         return 1;
 624 }
 625
 626 static int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) {
 627         Manager *m = userdata;
 628         Link *link = NULL;
 629         NetDev *netdev = NULL;
 630         uint16_t type;
 631         const char *name;
 632         int r, ifindex;
 633
 634         assert(rtnl);
 635         assert(message);
 636         assert(m);
 637
 638         if (sd_netlink_message_is_error(message)) {
 639                 r = sd_netlink_message_get_errno(message);
 640                 if (r < 0)
 641                         log_warning_errno(r, "rtnl: Could not receive link: %m");
 642
 643                 return 0;
 644         }
 645
 646         r = sd_netlink_message_get_type(message, &type);
 647         if (r < 0) {
 648                 log_warning_errno(r, "rtnl: Could not get message type: %m");
 649                 return 0;
 650         } else if (type != RTM_NEWLINK && type != RTM_DELLINK) {
 651                 log_warning("rtnl: Received unexpected message type when processing link");
 652                 return 0;
 653         }
 654
 655         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 656         if (r < 0) {
 657                 log_warning_errno(r, "rtnl: Could not get ifindex from link: %m");
 658                 return 0;
 659         } else if (ifindex <= 0) {
 660                 log_warning("rtnl: received link message with invalid ifindex: %d", ifindex);
 661                 return 0;
 662         }
 663
 664         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
 665         if (r < 0) {
 666                 log_warning_errno(r, "rtnl: Received link message without ifname: %m");
 667                 return 0;
 668         }
 669
 670         (void) link_get(m, ifindex, &link);
 671         (void) netdev_get(m, name, &netdev);
 672
 673         switch (type) {
 674         case RTM_NEWLINK:
 675                 if (!link) {
 676                         /* link is new, so add it */
 677                         r = link_add(m, message, &link);
 678                         if (r < 0) {
 679                                 log_warning_errno(r, "Could not add new link: %m");
 680                                 return 0;
 681                         }
 682                 }
 683
 684                 if (netdev) {
 685                         /* netdev exists, so make sure the ifindex matches */
 686                         r = netdev_set_ifindex(netdev, message);
 687                         if (r < 0) {
 688                                 log_warning_errno(r, "Could not set ifindex on netdev: %m");
 689                                 return 0;
 690                         }
 691                 }
 692
 693                 r = link_update(link, message);
 694                 if (r < 0)
 695                         return 0;
 696
 697                 break;
 698
 699         case RTM_DELLINK:
 700                 link_drop(link);
 701                 netdev_drop(netdev);
 702
 703                 break;
 704
 705         default:
 706                 assert_not_reached("Received invalid RTNL message type.");
 707         }
 708
 709         return 1;
 710 }
 711
 712 static int systemd_netlink_fd(void) {
 713         int n, fd, rtnl_fd = -EINVAL;
 714
 715         n = sd_listen_fds(true);
 716         if (n <= 0)
 717                 return -EINVAL;
 718
 719         for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd ++) {
 720                 if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1) > 0) {
 721                         if (rtnl_fd >= 0)
 722                                 return -EINVAL;
 723
 724                         rtnl_fd = fd;
 725                 }
 726         }
 727
 728         return rtnl_fd;
 729 }
 730
 731 static int manager_connect_rtnl(Manager *m) {
 732         int fd, r;
 733
 734         assert(m);
 735
 736         fd = systemd_netlink_fd();
 737         if (fd < 0)
 738                 r = sd_netlink_open(&m->rtnl);
 739         else
 740                 r = sd_netlink_open_fd(&m->rtnl, fd);
 741         if (r < 0)
 742                 return r;
 743
 744         r = sd_netlink_inc_rcvbuf(m->rtnl, RCVBUF_SIZE);
 745         if (r < 0)
 746                 return r;
 747
 748         r = sd_netlink_attach_event(m->rtnl, m->event, 0);
 749         if (r < 0)
 750                 return r;
 751
 752         r = sd_netlink_add_match(m->rtnl, RTM_NEWLINK, &manager_rtnl_process_link, m);
 753         if (r < 0)
 754                 return r;
 755
 756         r = sd_netlink_add_match(m->rtnl, RTM_DELLINK, &manager_rtnl_process_link, m);
 757         if (r < 0)
 758                 return r;
 759
 760         r = sd_netlink_add_match(m->rtnl, RTM_NEWADDR, &manager_rtnl_process_address, m);
 761         if (r < 0)
 762                 return r;
 763
 764         r = sd_netlink_add_match(m->rtnl, RTM_DELADDR, &manager_rtnl_process_address, m);
 765         if (r < 0)
 766                 return r;
 767
 768         r = sd_netlink_add_match(m->rtnl, RTM_NEWROUTE, &manager_rtnl_process_route, m);
 769         if (r < 0)
 770                 return r;
 771
 772         r = sd_netlink_add_match(m->rtnl, RTM_DELROUTE, &manager_rtnl_process_route, m);
 773         if (r < 0)
 774                 return r;
 775
 776         return 0;
 777 }
 778
 779 static int ordered_set_put_in_addr(OrderedSet *s, const struct in_addr *address) {
 780         char *p;
 781         int r;
 782
 783         assert(s);
 784
 785         r = in_addr_to_string(AF_INET, (const union in_addr_union*) address, &p);
 786         if (r < 0)
 787                 return r;
 788
 789         r = ordered_set_consume(s, p);
 790         if (r == -EEXIST)
 791                 return 0;
 792
 793         return r;
 794 }
 795
 796 static int ordered_set_put_in_addrv(OrderedSet *s, const struct in_addr *addresses, int n) {
 797         int r, i, c = 0;
 798
 799         assert(s);
 800         assert(n <= 0 || addresses);
 801
 802         for (i = 0; i < n; i++) {
 803                 r = ordered_set_put_in_addr(s, addresses+i);
 804                 if (r < 0)
 805                         return r;
 806
 807                 c += r;
 808         }
 809
 810         return c;
 811 }
 812
 813 static void print_string_set(FILE *f, const char *field, OrderedSet *s) {
 814         bool space = false;
 815         Iterator i;
 816         char *p;
 817
 818         if (ordered_set_isempty(s))
 819                 return;
 820
 821         fputs(field, f);
 822
 823         ORDERED_SET_FOREACH(p, s, i)
 824                 fputs_with_space(f, p, NULL, &space);
 825
 826         fputc('\n', f);
 827 }
 828
 829 static int manager_save(Manager *m) {
 830         _cleanup_ordered_set_free_free_ OrderedSet *dns = NULL, *ntp = NULL, *search_domains = NULL, *route_domains = NULL;
 831         Link *link;
 832         Iterator i;
 833         _cleanup_free_ char *temp_path = NULL;
 834         _cleanup_fclose_ FILE *f = NULL;
 835         LinkOperationalState operstate = LINK_OPERSTATE_OFF;
 836         const char *operstate_str;
 837         int r;
 838
 839         assert(m);
 840         assert(m->state_file);
 841
 842         /* We add all NTP and DNS server to a set, to filter out duplicates */
 843         dns = ordered_set_new(&string_hash_ops);
 844         if (!dns)
 845                 return -ENOMEM;
 846
 847         ntp = ordered_set_new(&string_hash_ops);
 848         if (!ntp)
 849                 return -ENOMEM;
 850
 851         search_domains = ordered_set_new(&dns_name_hash_ops);
 852         if (!search_domains)
 853                 return -ENOMEM;
 854
 855         route_domains = ordered_set_new(&dns_name_hash_ops);
 856         if (!route_domains)
 857                 return -ENOMEM;
 858
 859         HASHMAP_FOREACH(link, m->links, i) {
 860                 if (link->flags & IFF_LOOPBACK)
 861                         continue;
 862
 863                 if (link->operstate > operstate)
 864                         operstate = link->operstate;
 865
 866                 if (!link->network)
 867                         continue;
 868
 869                 /* First add the static configured entries */
 870                 r = ordered_set_put_strdupv(dns, link->network->dns);
 871                 if (r < 0)
 872                         return r;
 873
 874                 r = ordered_set_put_strdupv(ntp, link->network->ntp);
 875                 if (r < 0)
 876                         return r;
 877
 878                 r = ordered_set_put_strdupv(search_domains, link->network->search_domains);
 879                 if (r < 0)
 880                         return r;
 881
 882                 r = ordered_set_put_strdupv(route_domains, link->network->route_domains);
 883                 if (r < 0)
 884                         return r;
 885
 886                 if (!link->dhcp_lease)
 887                         continue;
 888
 889                 /* Secondly, add the entries acquired via DHCP */
 890                 if (link->network->dhcp_use_dns) {
 891                         const struct in_addr *addresses;
 892
 893                         r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
 894                         if (r > 0) {
 895                                 r = ordered_set_put_in_addrv(dns, addresses, r);
 896                                 if (r < 0)
 897                                         return r;
 898                         } else if (r < 0 && r != -ENODATA)
 899                                 return r;
 900                 }
 901
 902                 if (link->network->dhcp_use_ntp) {
 903                         const struct in_addr *addresses;
 904
 905                         r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
 906                         if (r > 0) {
 907                                 r = ordered_set_put_in_addrv(ntp, addresses, r);
 908                                 if (r < 0)
 909                                         return r;
 910                         } else if (r < 0 && r != -ENODATA)
 911                                 return r;
 912                 }
 913
 914                 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
 915                         const char *domainname;
 916
 917                         r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname);
 918                         if (r >= 0) {
 919
 920                                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES)
 921                                         r = ordered_set_put_strdup(search_domains, domainname);
 922                                 else
 923                                         r = ordered_set_put_strdup(route_domains, domainname);
 924
 925                                 if (r < 0)
 926                                         return r;
 927                         } else if (r != -ENODATA)
 928                                 return r;
 929                 }
 930         }
 931
 932         operstate_str = link_operstate_to_string(operstate);
 933         assert(operstate_str);
 934
 935         r = fopen_temporary(m->state_file, &f, &temp_path);
 936         if (r < 0)
 937                 return r;
 938
 939         fchmod(fileno(f), 0644);
 940
 941         fprintf(f,
 942                 "# This is private data. Do not parse.\n"
 943                 "OPER_STATE=%s\n", operstate_str);
 944
 945         print_string_set(f, "DNS=", dns);
 946         print_string_set(f, "NTP=", ntp);
 947         print_string_set(f, "DOMAINS=", search_domains);
 948         print_string_set(f, "ROUTE_DOMAINS=", route_domains);
 949
 950         r = fflush_and_check(f);
 951         if (r < 0)
 952                 goto fail;
 953
 954         if (rename(temp_path, m->state_file) < 0) {
 955                 r = -errno;
 956                 goto fail;
 957         }
 958
 959         if (m->operational_state != operstate) {
 960                 m->operational_state = operstate;
 961                 r = manager_send_changed(m, "OperationalState", NULL);
 962                 if (r < 0)
 963                         log_error_errno(r, "Could not emit changed OperationalState: %m");
 964         }
 965
 966         m->dirty = false;
 967
 968         return 0;
 969
 970 fail:
 971         (void) unlink(m->state_file);
 972         (void) unlink(temp_path);
 973
 974         return log_error_errno(r, "Failed to save network state to %s: %m", m->state_file);
 975 }
 976
 977 static int manager_dirty_handler(sd_event_source *s, void *userdata) {
 978         Manager *m = userdata;
 979         Link *link;
 980         Iterator i;
 981         int r;
 982
 983         assert(m);
 984
 985         if (m->dirty)
 986                 manager_save(m);
 987
 988         SET_FOREACH(link, m->dirty_links, i) {
 989                 r = link_save(link);
 990                 if (r >= 0)
 991                         link_clean(link);
 992         }
 993
 994         return 1;
 995 }
 996
 997 int manager_new(Manager **ret) {
 998         _cleanup_manager_free_ Manager *m = NULL;
 999         int r;
1000
1001         m = new0(Manager, 1);
1002         if (!m)
1003                 return -ENOMEM;
1004
1005         m->state_file = strdup("/run/systemd/netif/state");
1006         if (!m->state_file)
1007                 return -ENOMEM;
1008
1009         r = sd_event_default(&m->event);
1010         if (r < 0)
1011                 return r;
1012
1013         sd_event_set_watchdog(m->event, true);
1014
1015         sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
1016         sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
1017
1018         r = sd_event_add_post(m->event, NULL, manager_dirty_handler, m);
1019         if (r < 0)
1020                 return r;
1021
1022         r = manager_connect_rtnl(m);
1023         if (r < 0)
1024                 return r;
1025
1026         r = manager_connect_udev(m);
1027         if (r < 0)
1028                 return r;
1029
1030         m->netdevs = hashmap_new(&string_hash_ops);
1031         if (!m->netdevs)
1032                 return -ENOMEM;
1033
1034         LIST_HEAD_INIT(m->networks);
1035
1036         r = setup_default_address_pool(m);
1037         if (r < 0)
1038                 return r;
1039
1040         *ret = m;
1041         m = NULL;
1042
1043         return 0;
1044 }
1045
1046 void manager_free(Manager *m) {
1047         Network *network;
1048         NetDev *netdev;
1049         Link *link;
1050         AddressPool *pool;
1051
1052         if (!m)
1053                 return;
1054
1055         free(m->state_file);
1056
1057         while ((link = hashmap_first(m->links)))
1058                 link_unref(link);
1059         hashmap_free(m->links);
1060
1061         while ((network = m->networks))
1062                 network_free(network);
1063
1064         hashmap_free(m->networks_by_name);
1065
1066         while ((netdev = hashmap_first(m->netdevs)))
1067                 netdev_unref(netdev);
1068         hashmap_free(m->netdevs);
1069
1070         while ((pool = m->address_pools))
1071                 address_pool_free(pool);
1072
1073         sd_netlink_unref(m->rtnl);
1074         sd_event_unref(m->event);
1075
1076         sd_event_source_unref(m->udev_event_source);
1077         udev_monitor_unref(m->udev_monitor);
1078         udev_unref(m->udev);
1079
1080         sd_bus_unref(m->bus);
1081         sd_bus_slot_unref(m->prepare_for_sleep_slot);
1082         sd_event_source_unref(m->bus_retry_event_source);
1083
1084         free(m);
1085 }
1086
1087 static bool manager_check_idle(void *userdata) {
1088         Manager *m = userdata;
1089         Link *link;
1090         Iterator i;
1091
1092         assert(m);
1093
1094         /* Check whether we are idle now. The only case when we decide to be idle is when there's only a loopback
1095          * device around, for which we have no configuration, and which already left the PENDING state. In all other
1096          * cases we are not idle. */
1097
1098         HASHMAP_FOREACH(link, m->links, i) {
1099                 /* We are not woken on udev activity, so let's just wait for the pending udev event */
1100                 if (link->state == LINK_STATE_PENDING)
1101                         return false;
1102
1103                 if ((link->flags & IFF_LOOPBACK) == 0)
1104                         return false;
1105
1106                 if (link->network)
1107                         return false;
1108         }
1109
1110         return true;
1111 }
1112
1113 int manager_run(Manager *m) {
1114         Link *link;
1115         Iterator i;
1116
1117         assert(m);
1118
1119         /* The dirty handler will deal with future serialization, but the first one
1120            must be done explicitly. */
1121
1122         manager_save(m);
1123
1124         HASHMAP_FOREACH(link, m->links, i)
1125                 link_save(link);
1126
1127         if (m->bus)
1128                 return bus_event_loop_with_idle(
1129                                 m->event,
1130                                 m->bus,
1131                                 "org.freedesktop.network1",
1132                                 DEFAULT_EXIT_USEC,
1133                                 manager_check_idle,
1134                                 m);
1135         else
1136                 /* failed to connect to the bus, so we lose exit-on-idle logic,
1137                    this should not happen except if dbus is not around at all */
1138                 return sd_event_loop(m->event);
1139 }
1140
1141 int manager_load_config(Manager *m) {
1142         int r;
1143
1144         /* update timestamp */
1145         paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, true);
1146
1147         r = netdev_load(m);
1148         if (r < 0)
1149                 return r;
1150
1151         r = network_load(m);
1152         if (r < 0)
1153                 return r;
1154
1155         return 0;
1156 }
1157
1158 bool manager_should_reload(Manager *m) {
1159         return paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, false);
1160 }
1161
1162 int manager_rtnl_enumerate_links(Manager *m) {
1163         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
1164         sd_netlink_message *link;
1165         int r;
1166
1167         assert(m);
1168         assert(m->rtnl);
1169
1170         r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
1171         if (r < 0)
1172                 return r;
1173
1174         r = sd_netlink_message_request_dump(req, true);
1175         if (r < 0)
1176                 return r;
1177
1178         r = sd_netlink_call(m->rtnl, req, 0, &reply);
1179         if (r < 0)
1180                 return r;
1181
1182         for (link = reply; link; link = sd_netlink_message_next(link)) {
1183                 int k;
1184
1185                 m->enumerating = true;
1186
1187                 k = manager_rtnl_process_link(m->rtnl, link, m);
1188                 if (k < 0)
1189                         r = k;
1190
1191                 m->enumerating = false;
1192         }
1193
1194         return r;
1195 }
1196
1197 int manager_rtnl_enumerate_addresses(Manager *m) {
1198         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
1199         sd_netlink_message *addr;
1200         int r;
1201
1202         assert(m);
1203         assert(m->rtnl);
1204
1205         r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, 0);
1206         if (r < 0)
1207                 return r;
1208
1209         r = sd_netlink_message_request_dump(req, true);
1210         if (r < 0)
1211                 return r;
1212
1213         r = sd_netlink_call(m->rtnl, req, 0, &reply);
1214         if (r < 0)
1215                 return r;
1216
1217         for (addr = reply; addr; addr = sd_netlink_message_next(addr)) {
1218                 int k;
1219
1220                 m->enumerating = true;
1221
1222                 k = manager_rtnl_process_address(m->rtnl, addr, m);
1223                 if (k < 0)
1224                         r = k;
1225
1226                 m->enumerating = false;
1227         }
1228
1229         return r;
1230 }
1231
1232 int manager_rtnl_enumerate_routes(Manager *m) {
1233         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
1234         sd_netlink_message *route;
1235         int r;
1236
1237         assert(m);
1238         assert(m->rtnl);
1239
1240         r = sd_rtnl_message_new_route(m->rtnl, &req, RTM_GETROUTE, 0, 0);
1241         if (r < 0)
1242                 return r;
1243
1244         r = sd_netlink_message_request_dump(req, true);
1245         if (r < 0)
1246                 return r;
1247
1248         r = sd_netlink_call(m->rtnl, req, 0, &reply);
1249         if (r < 0)
1250                 return r;
1251
1252         for (route = reply; route; route = sd_netlink_message_next(route)) {
1253                 int k;
1254
1255                 m->enumerating = true;
1256
1257                 k = manager_rtnl_process_route(m->rtnl, route, m);
1258                 if (k < 0)
1259                         r = k;
1260
1261                 m->enumerating = false;
1262         }
1263
1264         return r;
1265 }
1266
1267 int manager_address_pool_acquire(Manager *m, int family, unsigned prefixlen, union in_addr_union *found) {
1268         AddressPool *p;
1269         int r;
1270
1271         assert(m);
1272         assert(prefixlen > 0);
1273         assert(found);
1274
1275         LIST_FOREACH(address_pools, p, m->address_pools) {
1276                 if (p->family != family)
1277                         continue;
1278
1279                 r = address_pool_acquire(p, prefixlen, found);
1280                 if (r != 0)
1281                         return r;
1282         }
1283
1284         return 0;
1285 }
1286
1287 Link* manager_find_uplink(Manager *m, Link *exclude) {
1288         _cleanup_free_ struct local_address *gateways = NULL;
1289         int n, i;
1290
1291         assert(m);
1292
1293         /* Looks for a suitable "uplink", via black magic: an
1294          * interface that is up and where the default route with the
1295          * highest priority points to. */
1296
1297         n = local_gateways(m->rtnl, 0, AF_UNSPEC, &gateways);
1298         if (n < 0) {
1299                 log_warning_errno(n, "Failed to determine list of default gateways: %m");
1300                 return NULL;
1301         }
1302
1303         for (i = 0; i < n; i++) {
1304                 Link *link;
1305
1306                 link = hashmap_get(m->links, INT_TO_PTR(gateways[i].ifindex));
1307                 if (!link) {
1308                         log_debug("Weird, found a gateway for a link we don't know. Ignoring.");
1309                         continue;
1310                 }
1311
1312                 if (link == exclude)
1313                         continue;
1314
1315                 if (link->operstate < LINK_OPERSTATE_ROUTABLE)
1316                         continue;
1317
1318                 return link;
1319         }
1320
1321         return NULL;
1322 }
1323
1324 void manager_dirty(Manager *manager) {
1325         assert(manager);
1326
1327         /* the serialized state in /run is no longer up-to-date */
1328         manager->dirty = true;
1329 }