git.ozlabs.org Git - petitboot/blob - discover/network.c

   1
   2 #include <stdbool.h>
   3 #include <stdint.h>
   4 #include <string.h>
   5 #include <stdlib.h>
   6 #include <errno.h>
   7 #include <sys/socket.h>
   8 #include <linux/if.h>
   9 #include <linux/netlink.h>
  10 #include <linux/rtnetlink.h>
  11 #include <i18n/i18n.h>
  12
  13 #include <log/log.h>
  14 #include <list/list.h>
  15 #include <file/file.h>
  16 #include <types/types.h>
  17 #include <talloc/talloc.h>
  18 #include <waiter/waiter.h>
  19 #include <process/process.h>
  20 #include <system/system.h>
  21
  22 #include "network.h"
  23 #include "sysinfo.h"
  24 #include "platform.h"
  25 #include "device-handler.h"
  26 #include "paths.h"
  27
  28 #define HWADDR_SIZE     6
  29 #define PIDFILE_BASE    (LOCAL_STATE_DIR "/petitboot/")
  30 #define INITIAL_BUFSIZE 4096
  31
  32 #define for_each_nlmsg(buf, nlmsg, len) \
  33         for (nlmsg = (struct nlmsghdr *)buf; \
  34                 NLMSG_OK(nlmsg, len) && nlmsg->nlmsg_type != NLMSG_DONE; \
  35                 nlmsg = NLMSG_NEXT(nlmsg, len))
  36
  37 #define for_each_rta(buf, rta, attrlen) \
  38         for (rta = (struct rtattr *)(buf); RTA_OK(rta, attrlen); \
  39                         rta = RTA_NEXT(rta, attrlen))
  40
  41
  42 struct interface {
  43         int     ifindex;
  44         char    name[IFNAMSIZ];
  45         uint8_t hwaddr[HWADDR_SIZE];
  46
  47         enum {
  48                 IFSTATE_NEW,
  49                 IFSTATE_UP_WAITING_LINK,
  50                 IFSTATE_CONFIGURED,
  51                 IFSTATE_IGNORED,
  52         } state;
  53
  54         struct list_item list;
  55         struct process *udhcpc_process;
  56         struct discover_device *dev;
  57 };
  58
  59 struct network {
  60         struct list             interfaces;
  61         struct device_handler   *handler;
  62         struct waiter           *waiter;
  63         int                     netlink_sd;
  64         void                    *netlink_buf;
  65         unsigned int            netlink_buf_size;
  66         bool                    manual_config;
  67         bool                    dry_run;
  68 };
  69
  70 static char *mac_bytes_to_string(void *ctx, uint8_t *addr, int len)
  71 {
  72         const int l = strlen("xx:");
  73         char *buf;
  74         int i;
  75
  76         if (len <= 0)
  77                 return talloc_strdup(ctx, "");
  78
  79         buf = talloc_array(ctx, char, (len * l) + 1);
  80
  81         for (i = 0; i < len; i++)
  82                 sprintf(buf + (l * i), "%02x:", addr[i]);
  83
  84         *(buf + (l * len) - 1) = '\0';
  85
  86         return buf;
  87 }
  88
  89 static const struct interface_config *find_config_by_hwaddr(
  90                 uint8_t *hwaddr)
  91 {
  92         const struct config *config;
  93         unsigned int i;
  94
  95         config = config_get();
  96         if (!config)
  97                 return NULL;
  98
  99         for (i = 0; i < config->network.n_interfaces; i++) {
 100                 struct interface_config *ifconf = config->network.interfaces[i];
 101
 102                 if (!memcmp(ifconf->hwaddr, hwaddr, HWADDR_SIZE))
 103                         return ifconf;
 104         }
 105
 106         return NULL;
 107 }
 108
 109 static struct interface *find_interface_by_ifindex(struct network *network,
 110                 int ifindex)
 111 {
 112         struct interface *interface;
 113
 114         list_for_each_entry(&network->interfaces, interface, list)
 115                 if (interface->ifindex == ifindex)
 116                         return interface;
 117
 118         return NULL;
 119 }
 120
 121 static struct interface *find_interface_by_name(struct network *network,
 122                 const char *name)
 123 {
 124         struct interface *interface;
 125
 126         list_for_each_entry(&network->interfaces, interface, list)
 127                 if (!strcmp(interface->name, name))
 128                         return interface;
 129
 130         return NULL;
 131 }
 132
 133 static struct interface *find_interface_by_uuid(struct network *network,
 134                 const char *uuid)
 135 {
 136         struct interface *interface;
 137         char *mac;
 138
 139         list_for_each_entry(&network->interfaces, interface, list) {
 140                 mac = mac_bytes_to_string(interface, interface->hwaddr,
 141                                         sizeof(interface->hwaddr));
 142                 if (!strcmp(mac, uuid)) {
 143                         talloc_free(mac);
 144                         return interface;
 145                 }
 146                 talloc_free(mac);
 147         }
 148
 149         return NULL;
 150 }
 151
 152 uint8_t *find_mac_by_name(void *ctx, struct network *network,
 153                 const char *name)
 154 {
 155         struct interface *interface;
 156
 157         interface = find_interface_by_name(network, name);
 158         if (!interface)
 159                 return NULL;
 160
 161         return talloc_memdup(ctx, &interface->hwaddr,
 162                              sizeof(uint8_t) * HWADDR_SIZE);
 163 }
 164
 165 static int network_init_netlink(struct network *network)
 166 {
 167         struct sockaddr_nl addr;
 168         int rc;
 169
 170         memset(&addr, 0, sizeof(addr));
 171         addr.nl_family = AF_NETLINK;
 172         addr.nl_groups = RTMGRP_LINK;
 173
 174         network->netlink_sd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
 175         if (network->netlink_sd < 0) {
 176                 perror("socket(AF_NETLINK)");
 177                 return -1;
 178         }
 179
 180         rc = bind(network->netlink_sd, (struct sockaddr *)&addr, sizeof(addr));
 181         if (rc) {
 182                 perror("bind(sockaddr_nl)");
 183                 close(network->netlink_sd);
 184                 return -1;
 185         }
 186
 187         network->netlink_buf_size = INITIAL_BUFSIZE;
 188         network->netlink_buf = talloc_array(network, char,
 189                                 network->netlink_buf_size);
 190
 191         return 0;
 192 }
 193
 194 static int network_send_link_query(struct network *network)
 195 {
 196         int rc;
 197         struct {
 198                 struct nlmsghdr nlmsg;
 199                 struct rtgenmsg rtmsg;
 200         } msg;
 201
 202         memset(&msg, 0, sizeof(msg));
 203
 204         msg.nlmsg.nlmsg_len = sizeof(msg);
 205         msg.nlmsg.nlmsg_type = RTM_GETLINK;
 206         msg.nlmsg.nlmsg_flags = NLM_F_REQUEST | NLM_F_ROOT;
 207         msg.nlmsg.nlmsg_seq = 0;
 208         msg.nlmsg.nlmsg_pid = 0;
 209         msg.rtmsg.rtgen_family = AF_UNSPEC;
 210
 211         rc = send(network->netlink_sd, &msg, sizeof(msg), MSG_NOSIGNAL);
 212         if (rc != sizeof(msg))
 213                 return -1;
 214
 215         return 0;
 216 }
 217
 218 static void create_interface_dev(struct network *network,
 219                 struct interface *interface)
 220 {
 221         char *uuid = mac_bytes_to_string(interface, interface->hwaddr,
 222                                                 sizeof(interface->hwaddr));
 223
 224         interface->dev = discover_device_create(network->handler, uuid,
 225                                                 interface->name);
 226         interface->dev->device->type = DEVICE_TYPE_NETWORK;
 227         device_handler_add_device(network->handler, interface->dev);
 228         talloc_free(uuid);
 229 }
 230
 231 static void remove_interface(struct network *network,
 232                 struct interface *interface)
 233 {
 234         if (interface->dev)
 235                 device_handler_remove(network->handler, interface->dev);
 236         list_remove(&interface->list);
 237         talloc_free(interface);
 238 }
 239
 240 void network_register_device(struct network *network,
 241                 struct discover_device *dev)
 242 {
 243         struct interface *iface;
 244
 245         if (dev->uuid)
 246                 iface = find_interface_by_uuid(network, dev->uuid);
 247         else
 248                 iface = find_interface_by_name(network, dev->label);
 249         if (!iface)
 250                 return;
 251
 252         iface->dev = dev;
 253         dev->uuid = mac_bytes_to_string(iface->dev, iface->hwaddr,
 254                         sizeof(iface->hwaddr));
 255 }
 256
 257 void network_unregister_device(struct network *network,
 258                 struct discover_device *dev)
 259 {
 260         struct interface *iface;
 261
 262         iface = find_interface_by_uuid(network, dev->uuid);
 263         if (!iface)
 264                 return;
 265
 266         iface->dev = NULL;
 267 }
 268
 269 static int interface_change(struct interface *interface, bool up)
 270 {
 271         const char *statestr = up ? "up" : "down";
 272         int rc;
 273
 274         if (!up && interface->udhcpc_process) {
 275                 /* we don't care about the callback from here */
 276                 interface->udhcpc_process->exit_cb = NULL;
 277                 interface->udhcpc_process->data = NULL;
 278                 process_stop_async(interface->udhcpc_process);
 279                 process_release(interface->udhcpc_process);
 280         }
 281
 282         if (!up) {
 283                 rc = process_run_simple(interface, pb_system_apps.ip,
 284                                 "address", "flush", "dev", interface->name,
 285                                 NULL);
 286                 if (rc)
 287                         pb_log("failed to flush addresses from interface %s\n",
 288                                 interface->name);
 289         }
 290
 291         rc = process_run_simple(interface, pb_system_apps.ip,
 292                         "link", "set", interface->name, statestr, NULL);
 293         if (rc) {
 294                 pb_log("failed to bring interface %s %s\n", interface->name,
 295                                 statestr);
 296                 return -1;
 297         }
 298         return 0;
 299 }
 300
 301 static int interface_up(struct interface *interface)
 302 {
 303         return interface_change(interface, true);
 304 }
 305
 306 static int interface_down(struct interface *interface)
 307 {
 308         return interface_change(interface, false);
 309 }
 310
 311 static void udhcpc_process_exit(struct process *process)
 312 {
 313         struct interface *interface = process->data;
 314         pb_debug("udhcp client [pid %d] for interface %s exited, rc %d\n",
 315                         process->pid, interface->name, process->exit_status);
 316         interface->udhcpc_process = NULL;
 317         process_release(process);
 318 }
 319
 320 static void configure_interface_dhcp(struct network *network,
 321                 struct interface *interface)
 322 {
 323         const struct platform *platform;
 324         char pidfile[256], id[10];
 325         struct process *process;
 326         int rc;
 327         const char *argv[] = {
 328                 pb_system_apps.udhcpc,
 329                 "-R",
 330                 "-f",
 331                 "-O", "pxeconffile",
 332                 "-O", "pxepathprefix",
 333                 "-p", pidfile,
 334                 "-i", interface->name,
 335                 "-x", id, /* [11,12] - dhcp client identifier */
 336                 NULL,
 337         };
 338
 339         device_handler_status_dev_info(network->handler, interface->dev,
 340                         _("Configuring with DHCP"));
 341
 342         snprintf(pidfile, sizeof(pidfile), "%s/udhcpc-%s.pid",
 343                         PIDFILE_BASE, interface->name);
 344
 345         platform = platform_get();
 346         if (platform && platform->dhcp_arch_id != 0xffff)
 347                 snprintf(id, sizeof(id), "0x5d:%04x", platform->dhcp_arch_id);
 348         else
 349                 argv[11] = NULL;
 350
 351         process = process_create(interface);
 352
 353         process->path = pb_system_apps.udhcpc;
 354         process->argv = argv;
 355         process->exit_cb = udhcpc_process_exit;
 356         process->data = interface;
 357
 358         rc = process_run_async(process);
 359
 360         if (rc)
 361                 process_release(process);
 362         else
 363                 interface->udhcpc_process = process;
 364
 365         return;
 366 }
 367
 368 static void configure_interface_static(struct network *network,
 369                 struct interface *interface,
 370                 const struct interface_config *config)
 371 {
 372         int rc;
 373
 374         device_handler_status_dev_info(network->handler, interface->dev,
 375                         _("Configuring with static address (ip: %s)"),
 376                         config->static_config.address);
 377
 378         rc = process_run_simple(interface, pb_system_apps.ip,
 379                         "address", "add", config->static_config.address,
 380                         "dev", interface->name, NULL);
 381
 382
 383         if (rc) {
 384                 pb_log("failed to add address %s to interface %s\n",
 385                                 config->static_config.address,
 386                                 interface->name);
 387                 return;
 388         }
 389
 390         system_info_set_interface_address(sizeof(interface->hwaddr),
 391                                 interface->hwaddr,
 392                                 config->static_config.address);
 393
 394         /* we need the interface up before we can route through it */
 395         rc = interface_up(interface);
 396         if (rc)
 397                 return;
 398
 399         if (config->static_config.gateway)
 400                 rc = process_run_simple(interface, pb_system_apps.ip,
 401                                 "route", "add", "default",
 402                                 "via", config->static_config.gateway,
 403                                 NULL);
 404
 405         if (rc) {
 406                 pb_log("failed to add default route %s on interface %s\n",
 407                                 config->static_config.gateway,
 408                                 interface->name);
 409         }
 410
 411         if (config->static_config.url) {
 412                 pb_log("config URL %s\n", config->static_config.url);
 413                 device_handler_process_url(network->handler,
 414                                 config->static_config.url,
 415                                 mac_bytes_to_string(interface->dev,
 416                                                 interface->hwaddr,
 417                                                 sizeof(interface->hwaddr)),
 418                                 config->static_config.address);
 419         }
 420
 421         return;
 422 }
 423
 424 static void configure_interface(struct network *network,
 425                 struct interface *interface, bool up, bool link)
 426 {
 427         const struct interface_config *config = NULL;
 428
 429         if (interface->state == IFSTATE_IGNORED)
 430                 return;
 431
 432         /* old interface? check that we're still up and running */
 433         if (interface->state == IFSTATE_CONFIGURED) {
 434                 if (!up)
 435                         interface->state = IFSTATE_NEW;
 436                 else if (!link)
 437                         interface->state = IFSTATE_UP_WAITING_LINK;
 438                 else {
 439                         pb_debug("network: skipping configured interface %s\n",
 440                                         interface->name);
 441                         return;
 442                 }
 443         }
 444
 445         /* always up the lookback, no other handling required */
 446         if (!strcmp(interface->name, "lo")) {
 447                 if (interface->state == IFSTATE_NEW)
 448                         interface_up(interface);
 449                 interface->state = IFSTATE_CONFIGURED;
 450                 return;
 451         }
 452
 453         config = find_config_by_hwaddr(interface->hwaddr);
 454         if (config && config->ignore) {
 455                 pb_log("network: ignoring interface %s\n", interface->name);
 456                 interface->state = IFSTATE_IGNORED;
 457                 return;
 458         }
 459
 460         /* if we're in manual config mode, we need an interface configuration */
 461         if (network->manual_config && !config) {
 462                 interface->state = IFSTATE_IGNORED;
 463                 pb_log("network: skipping %s: manual config mode, "
 464                                 "but no config for this interface\n",
 465                                 interface->name);
 466                 return;
 467         }
 468
 469         /* new interface? bring up to the point so we can detect a link */
 470         if (interface->state == IFSTATE_NEW) {
 471                 if (!up) {
 472                         interface_up(interface);
 473                         pb_log("network: bringing up interface %s\n",
 474                                         interface->name);
 475                         return;
 476
 477                 } else if (!link) {
 478                         interface->state = IFSTATE_UP_WAITING_LINK;
 479                 }
 480         }
 481
 482         /* no link? wait for a notification */
 483         if (interface->state == IFSTATE_UP_WAITING_LINK && !link)
 484                 return;
 485
 486         pb_log("network: configuring interface %s\n", interface->name);
 487
 488         if (!config || config->method == CONFIG_METHOD_DHCP) {
 489                 configure_interface_dhcp(network, interface);
 490
 491         } else if (config->method == CONFIG_METHOD_STATIC) {
 492                 configure_interface_static(network, interface, config);
 493                 /* Nothing left to do for static interfaces */
 494                 pending_network_jobs_start();
 495         }
 496
 497         interface->state = IFSTATE_CONFIGURED;
 498 }
 499
 500 static int network_handle_nlmsg(struct network *network, struct nlmsghdr *nlmsg)
 501 {
 502         bool have_ifaddr, have_ifname;
 503         struct interface *interface, *tmp;
 504         struct ifinfomsg *info;
 505         struct rtattr *attr;
 506         unsigned int mtu;
 507         uint8_t ifaddr[6];
 508         char ifname[IFNAMSIZ+1];
 509         int attrlen, type;
 510
 511
 512         /* we're only interested in NEWLINK messages */
 513         type = nlmsg->nlmsg_type;
 514         if (!(type == RTM_NEWLINK || type == RTM_DELLINK))
 515                 return 0;
 516
 517         info = NLMSG_DATA(nlmsg);
 518
 519         have_ifaddr = have_ifname = false;
 520         mtu = 1;
 521
 522         attrlen = nlmsg->nlmsg_len - sizeof(*info);
 523
 524         /* extract the interface name and hardware address attributes */
 525         for_each_rta(info + 1, attr, attrlen) {
 526                 void *data = RTA_DATA(attr);
 527
 528                 switch (attr->rta_type) {
 529                 case IFLA_ADDRESS:
 530                         memcpy(ifaddr, data, sizeof(ifaddr));
 531                         have_ifaddr = true;
 532                         break;
 533
 534                 case IFLA_IFNAME:
 535                         strncpy(ifname, data, IFNAMSIZ);
 536                         have_ifname = true;
 537                         break;
 538
 539                 case IFLA_MTU:
 540                         mtu = *(unsigned int *)data;
 541                         break;
 542                 }
 543         }
 544
 545         if (!have_ifaddr || !have_ifname)
 546                 return -1;
 547
 548         if (type == RTM_DELLINK || mtu == 0) {
 549                 interface = find_interface_by_ifindex(network, info->ifi_index);
 550                 if (!interface)
 551                         return 0;
 552                 pb_log("network: interface %s removed\n", interface->name);
 553                 remove_interface(network, interface);
 554                 return 0;
 555         }
 556
 557         /* ignore the default tun device in some environments */
 558         if (strncmp(ifname, "tun", strlen("tun")) == 0)
 559                 return 0;
 560
 561         interface = find_interface_by_ifindex(network, info->ifi_index);
 562         if (!interface) {
 563                 interface = talloc_zero(network, struct interface);
 564                 interface->ifindex = info->ifi_index;
 565                 interface->state = IFSTATE_NEW;
 566                 memcpy(interface->hwaddr, ifaddr, sizeof(interface->hwaddr));
 567                 strncpy(interface->name, ifname, sizeof(interface->name) - 1);
 568
 569                 list_for_each_entry(&network->interfaces, tmp, list)
 570                         if (memcmp(interface->hwaddr, tmp->hwaddr,
 571                                    sizeof(interface->hwaddr)) == 0) {
 572                                 pb_log("%s: %s has duplicate MAC address, ignoring\n",
 573                                        __func__, interface->name);
 574                                 talloc_free(interface);
 575                                 return -1;
 576                         }
 577
 578                 list_add(&network->interfaces, &interface->list);
 579                 create_interface_dev(network, interface);
 580         }
 581
 582         /* A repeated RTM_NEWLINK can represent an interface name change */
 583         if (strncmp(interface->name, ifname, IFNAMSIZ)) {
 584                 pb_debug("ifname update: %s -> %s\n", interface->name, ifname);
 585                 strncpy(interface->name, ifname, sizeof(interface->name) - 1);
 586                 talloc_free(interface->dev->device->id);
 587                 interface->dev->device->id =
 588                         talloc_strdup(interface->dev->device, ifname);
 589         }
 590
 591         /* notify the sysinfo code about changes to this interface */
 592         if (strcmp(interface->name, "lo"))
 593                 system_info_register_interface(
 594                                 sizeof(interface->hwaddr),
 595                                 interface->hwaddr, interface->name,
 596                                 info->ifi_flags & IFF_LOWER_UP);
 597
 598         if (!interface->dev)
 599                 create_interface_dev(network, interface);
 600
 601         configure_interface(network, interface,
 602                         info->ifi_flags & IFF_UP,
 603                         info->ifi_flags & IFF_LOWER_UP);
 604
 605         return 0;
 606 }
 607
 608 static int network_netlink_process(void *arg)
 609 {
 610         struct network *network = arg;
 611         struct nlmsghdr *nlmsg;
 612         struct msghdr msg;
 613         struct iovec iov;
 614         unsigned int len;
 615         int rc, flags;
 616
 617         memset(&msg, 0, sizeof(msg));
 618         msg.msg_iov = &iov;
 619         msg.msg_iovlen = 1;
 620
 621         flags = MSG_PEEK;
 622
 623 retry:
 624         iov.iov_len = network->netlink_buf_size;
 625         iov.iov_base = network->netlink_buf;
 626
 627         rc = recvmsg(network->netlink_sd, &msg, flags);
 628
 629         if (rc < 0) {
 630                 perror("netlink recv header");
 631                 return -1;
 632         }
 633
 634         len = rc;
 635
 636         /* if the netlink message was larger than our buffer, realloc
 637          * before reading again */
 638         if (len > network->netlink_buf_size || msg.msg_flags & MSG_TRUNC) {
 639                 network->netlink_buf_size *= 2;
 640                 network->netlink_buf = talloc_realloc(network,
 641                                         network->netlink_buf,
 642                                         char *,
 643                                         network->netlink_buf_size);
 644                 goto retry;
 645         }
 646
 647         /* otherwise, we're good to read the entire message without PEEK */
 648         if (flags == MSG_PEEK) {
 649                 flags = 0;
 650                 goto retry;
 651         }
 652
 653         for_each_nlmsg(network->netlink_buf, nlmsg, len)
 654                 network_handle_nlmsg(network, nlmsg);
 655
 656         return 0;
 657 }
 658
 659 static void network_init_dns(struct network *network)
 660 {
 661         const struct config *config;
 662         unsigned int i;
 663         int rc, len;
 664         bool modified;
 665         char *buf;
 666
 667         if (network->dry_run)
 668                 return;
 669
 670         config = config_get();
 671         if (!config || !config->network.n_dns_servers)
 672                 return;
 673
 674         rc = read_file(network, "/etc/resolv.conf", &buf, &len);
 675
 676         if (rc) {
 677                 buf = talloc_strdup(network, "");
 678                 len = 0;
 679         }
 680
 681         modified = false;
 682
 683         for (i = 0; i < config->network.n_dns_servers; i++) {
 684                 int dns_conf_len;
 685                 char *dns_conf;
 686
 687                 dns_conf = talloc_asprintf(network, "nameserver %s\n",
 688                                 config->network.dns_servers[i]);
 689
 690                 if (strstr(buf, dns_conf)) {
 691                         talloc_free(dns_conf);
 692                         continue;
 693                 }
 694
 695                 dns_conf_len = strlen(dns_conf);
 696                 buf = talloc_realloc(network, buf, char, len + dns_conf_len + 1);
 697                 memcpy(buf + len, dns_conf, dns_conf_len);
 698                 len += dns_conf_len;
 699                 buf[len] = '\0';
 700                 modified = true;
 701
 702                 talloc_free(dns_conf);
 703         }
 704
 705         if (modified) {
 706                 rc = replace_file("/etc/resolv.conf", buf, len);
 707                 if (rc)
 708                         pb_log("error replacing resolv.conf: %s\n",
 709                                         strerror(errno));
 710         }
 711
 712         talloc_free(buf);
 713 }
 714
 715 struct network *network_init(struct device_handler *handler,
 716                 struct waitset *waitset, bool dry_run)
 717 {
 718         struct network *network;
 719         int rc;
 720
 721         network = talloc(handler, struct network);
 722         list_init(&network->interfaces);
 723         network->handler = handler;
 724         network->dry_run = dry_run;
 725         network->manual_config = config_get()->network.n_interfaces != 0;
 726
 727         network_init_dns(network);
 728
 729         rc = network_init_netlink(network);
 730         if (rc)
 731                 goto err;
 732
 733         network->waiter = waiter_register_io(waitset, network->netlink_sd,
 734                         WAIT_IN, network_netlink_process, network);
 735
 736         if (!network->waiter)
 737                 goto err;
 738
 739         rc = network_send_link_query(network);
 740         if (rc)
 741                 goto err;
 742
 743         return network;
 744
 745 err:
 746         network_shutdown(network);
 747         return NULL;
 748 }
 749
 750 int network_shutdown(struct network *network)
 751 {
 752         struct interface *interface;
 753
 754         if (network->waiter)
 755                 waiter_remove(network->waiter);
 756
 757         list_for_each_entry(&network->interfaces, interface, list) {
 758                 if (interface->state == IFSTATE_IGNORED)
 759                         continue;
 760                 if (!strcmp(interface->name, "lo"))
 761                         continue;
 762                 interface_down(interface);
 763         }
 764
 765         close(network->netlink_sd);
 766         talloc_free(network);
 767         return 0;
 768 }