remote.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; either version 2 of the License.
   5  *
   6  *   This program is distributed in the hope that it will be useful,
   7  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9  *   GNU General Public License for more details.
  10  *
  11  *   You should have received a copy of the GNU General Public License
  12  *   along with this program; if not, write to the Free Software
  13  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  14  *
  15  *   Copyright (C) 2020 embedd.ch
  16  *   Copyright (C) 2020 Felix Fietkau <nbd@nbd.name>
  17  *   Copyright (C) 2020 John Crispin <john@phrozen.org>
  18  */
  19
  20 #include <sys/types.h>
  21 #include <sys/socket.h>
  22 #include <netinet/in.h>
  23 #include <net/if.h>
  24 #include <arpa/inet.h>
  25 #include <errno.h>
  26 #include <unistd.h>
  27
  28 #include <libubox/vlist.h>
  29 #include <libubox/avl-cmp.h>
  30 #include <libubox/usock.h>
  31 #include "usteer.h"
  32 #include "remote.h"
  33 #include "node.h"
  34
  35 static uint32_t local_id;
  36 static struct uloop_fd remote_fd;
  37 static struct uloop_timeout remote_timer;
  38 static struct uloop_timeout reload_timer;
  39
  40 static struct blob_buf buf;
  41 static uint32_t msg_seq;
  42
  43 struct interface {
  44         struct vlist_node node;
  45         int ifindex;
  46 };
  47
  48 static void
  49 interfaces_update_cb(struct vlist_tree *tree,
  50                      struct vlist_node *node_new,
  51                      struct vlist_node *node_old);
  52
  53 static int remote_host_cmp(const void *k1, const void *k2, void *ptr)
  54 {
  55         unsigned long v1 = (unsigned long) k1;
  56         unsigned long v2 = (unsigned long) k2;
  57
  58         return v2 - v1;
  59 }
  60
  61 static VLIST_TREE(interfaces, avl_strcmp, interfaces_update_cb, true, true);
  62 LIST_HEAD(remote_nodes);
  63 AVL_TREE(remote_hosts, remote_host_cmp, false, NULL);
  64
  65 static const char *
  66 interface_name(struct interface *iface)
  67 {
  68         return iface->node.avl.key;
  69 }
  70
  71 static void
  72 interface_check(struct interface *iface)
  73 {
  74         iface->ifindex = if_nametoindex(interface_name(iface));
  75         uloop_timeout_set(&reload_timer, 1);
  76 }
  77
  78 static void
  79 interface_init(struct interface *iface)
  80 {
  81         interface_check(iface);
  82 }
  83
  84 static void
  85 interface_free(struct interface *iface)
  86 {
  87         avl_delete(&interfaces.avl, &iface->node.avl);
  88         free(iface);
  89 }
  90
  91 static void
  92 interfaces_update_cb(struct vlist_tree *tree,
  93                      struct vlist_node *node_new,
  94                      struct vlist_node *node_old)
  95 {
  96         struct interface *iface;
  97
  98         if (node_new && node_old) {
  99                 iface = container_of(node_new, struct interface, node);
 100                 free(iface);
 101                 iface = container_of(node_old, struct interface, node);
 102                 interface_check(iface);
 103         } else if (node_old) {
 104                 iface = container_of(node_old, struct interface, node);
 105                 interface_free(iface);
 106         } else {
 107                 iface = container_of(node_new, struct interface, node);
 108                 interface_init(iface);
 109         }
 110 }
 111
 112 void usteer_interface_add(const char *name)
 113 {
 114         struct interface *iface;
 115         char *name_buf;
 116
 117         iface = calloc_a(sizeof(*iface), &name_buf, strlen(name) + 1);
 118         strcpy(name_buf, name);
 119         vlist_add(&interfaces, &iface->node, name_buf);
 120 }
 121
 122 void config_set_interfaces(struct blob_attr *data)
 123 {
 124         struct blob_attr *cur;
 125         int rem;
 126
 127         if (!data)
 128                 return;
 129
 130         if (!blobmsg_check_attr_list(data, BLOBMSG_TYPE_STRING))
 131                 return;
 132
 133         vlist_update(&interfaces);
 134         blobmsg_for_each_attr(cur, data, rem) {
 135                 usteer_interface_add(blobmsg_data(cur));
 136         }
 137         vlist_flush(&interfaces);
 138 }
 139
 140 void config_get_interfaces(struct blob_buf *buf)
 141 {
 142         struct interface *iface;
 143         void *c;
 144
 145         c = blobmsg_open_array(buf, "interfaces");
 146         vlist_for_each_element(&interfaces, iface, node) {
 147                 blobmsg_add_string(buf, NULL, interface_name(iface));
 148         }
 149         blobmsg_close_array(buf, c);
 150 }
 151
 152 static void
 153 interface_add_station(struct usteer_remote_node *node, struct blob_attr *data)
 154 {
 155         struct sta *sta;
 156         struct sta_info *si;
 157         struct apmsg_sta msg;
 158         bool create;
 159
 160         if (!parse_apmsg_sta(&msg, data)) {
 161                 MSG(DEBUG, "Cannot parse station in message\n");
 162                 return;
 163         }
 164
 165         if (msg.timeout <= 0) {
 166                 MSG(DEBUG, "Refuse to add an already expired station entry\n");
 167                 return;
 168         }
 169
 170         sta = usteer_sta_get(msg.addr, true);
 171         if (!sta)
 172                 return;
 173
 174         si = usteer_sta_info_get(sta, &node->node, &create);
 175         if (!si)
 176                 return;
 177
 178         si->connected = msg.connected;
 179         si->signal = msg.signal;
 180         si->seen = current_time - msg.seen;
 181         usteer_sta_info_update_timeout(si, msg.timeout);
 182 }
 183
 184 static void
 185 remote_node_free(struct usteer_remote_node *node)
 186 {
 187         struct usteer_remote_host *host = node->host;
 188
 189         list_del(&node->list);
 190         list_del(&node->host_list);
 191         usteer_sta_node_cleanup(&node->node);
 192         free(node);
 193
 194         if (!list_empty(&host->nodes))
 195                 return;
 196
 197         avl_delete(&remote_hosts, &host->avl);
 198         free(host->addr);
 199         free(host);
 200 }
 201
 202 static struct usteer_remote_host *
 203 interface_get_host(const char *addr, unsigned long id)
 204 {
 205         struct usteer_remote_host *host;
 206
 207         host = avl_find_element(&remote_hosts, (void *)id, host, avl);
 208         if (host)
 209                 goto out;
 210
 211         host = calloc(1, sizeof(*host));
 212         host->avl.key = (void *)id;
 213         INIT_LIST_HEAD(&host->nodes);
 214         avl_insert(&remote_hosts, &host->avl);
 215
 216 out:
 217         if (host->addr && !strcmp(host->addr, addr))
 218                 return host;
 219
 220         free(host->addr);
 221         host->addr = strdup(addr);
 222
 223         return host;
 224 }
 225
 226 static struct usteer_remote_node *
 227 interface_get_node(struct usteer_remote_host *host, const char *name)
 228 {
 229         struct usteer_remote_node *node;
 230         int addr_len = strlen(host->addr);
 231         char *buf;
 232
 233         list_for_each_entry(node, &host->nodes, host_list)
 234                 if (!strcmp(node->name, name))
 235                         return node;
 236
 237         node = calloc_a(sizeof(*node), &buf, addr_len + 1 + strlen(name) + 1);
 238         node->node.type = NODE_TYPE_REMOTE;
 239
 240         sprintf(buf, "%s#%s", host->addr, name);
 241         node->node.avl.key = buf;
 242         node->name = buf + addr_len + 1;
 243         node->host = host;
 244         INIT_LIST_HEAD(&node->node.sta_info);
 245
 246         list_add_tail(&node->list, &remote_nodes);
 247         list_add_tail(&node->host_list, &host->nodes);
 248
 249         return node;
 250 }
 251
 252 static void
 253 interface_add_node(struct usteer_remote_host *host, struct blob_attr *data)
 254 {
 255         struct usteer_remote_node *node;
 256         struct apmsg_node msg;
 257         struct blob_attr *cur;
 258         int rem;
 259
 260         if (!parse_apmsg_node(&msg, data)) {
 261                 MSG(DEBUG, "Cannot parse node in message\n");
 262                 return;
 263         }
 264
 265         node = interface_get_node(host, msg.name);
 266         node->check = 0;
 267         node->node.freq = msg.freq;
 268         node->node.n_assoc = msg.n_assoc;
 269         node->node.max_assoc = msg.max_assoc;
 270         node->node.noise = msg.noise;
 271         node->node.load = msg.load;
 272
 273         memcpy(node->node.bssid, msg.bssid, sizeof(node->node.bssid));
 274
 275         snprintf(node->node.ssid, sizeof(node->node.ssid), "%s", msg.ssid);
 276         usteer_node_set_blob(&node->node.rrm_nr, msg.rrm_nr);
 277         usteer_node_set_blob(&node->node.node_info, msg.node_info);
 278
 279         blob_for_each_attr(cur, msg.stations, rem)
 280                 interface_add_station(node, cur);
 281 }
 282
 283 static void
 284 interface_recv_msg(struct interface *iface, char *addr_str, void *buf, int len)
 285 {
 286         struct usteer_remote_host *host;
 287         struct blob_attr *data = buf;
 288         struct apmsg msg;
 289         struct blob_attr *cur;
 290         int rem;
 291
 292         if (blob_pad_len(data) != len) {
 293                 MSG(DEBUG, "Invalid message length (header: %d, real: %d)\n", blob_pad_len(data), len);
 294                 return;
 295         }
 296
 297         if (!parse_apmsg(&msg, data)) {
 298                 MSG(DEBUG, "Missing fields in message\n");
 299                 return;
 300         }
 301
 302         if (msg.id == local_id)
 303                 return;
 304
 305         MSG(NETWORK, "Received message on %s (id=%08x->%08x seq=%d len=%d)\n",
 306                 interface_name(iface), msg.id, local_id, msg.seq, len);
 307
 308         host = interface_get_host(addr_str, msg.id);
 309         usteer_node_set_blob(&host->host_info, msg.host_info);
 310
 311         blob_for_each_attr(cur, msg.nodes, rem)
 312                 interface_add_node(host, cur);
 313 }
 314
 315 static struct interface *
 316 interface_find_by_ifindex(int index)
 317 {
 318         struct interface *iface;
 319
 320         vlist_for_each_element(&interfaces, iface, node) {
 321                 if (iface->ifindex == index)
 322                         return iface;
 323         }
 324
 325         return NULL;
 326 }
 327
 328 static void
 329 interface_recv_v4(struct uloop_fd *u, unsigned int events)
 330 {
 331         static char buf[APMGR_BUFLEN];
 332         static char cmsg_buf[( CMSG_SPACE(sizeof(struct in_pktinfo)) + sizeof(int)) + 1];
 333         static struct sockaddr_in sin;
 334         char addr_str[INET_ADDRSTRLEN];
 335         static struct iovec iov = {
 336                 .iov_base = buf,
 337                 .iov_len = sizeof(buf)
 338         };
 339         static struct msghdr msg = {
 340                 .msg_name = &sin,
 341                 .msg_namelen = sizeof(sin),
 342                 .msg_iov = &iov,
 343                 .msg_iovlen = 1,
 344                 .msg_control = cmsg_buf,
 345                 .msg_controllen = sizeof(cmsg_buf),
 346         };
 347         struct cmsghdr *cmsg;
 348         int len;
 349
 350         do {
 351                 struct in_pktinfo *pkti = NULL;
 352                 struct interface *iface;
 353
 354                 len = recvmsg(u->fd, &msg, 0);
 355                 if (len < 0) {
 356                         switch (errno) {
 357                         case EAGAIN:
 358                                 return;
 359                         case EINTR:
 360                                 continue;
 361                         default:
 362                                 perror("recvmsg");
 363                                 uloop_fd_delete(u);
 364                                 return;
 365                         }
 366                 }
 367
 368                 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
 369                         if (cmsg->cmsg_type != IP_PKTINFO)
 370                                 continue;
 371
 372                         pkti = (struct in_pktinfo *) CMSG_DATA(cmsg);
 373                 }
 374
 375                 if (!pkti) {
 376                         MSG(DEBUG, "Received packet without ifindex\n");
 377                         continue;
 378                 }
 379
 380                 iface = interface_find_by_ifindex(pkti->ipi_ifindex);
 381                 if (!iface) {
 382                         MSG(DEBUG, "Received packet from unconfigured interface %d\n", pkti->ipi_ifindex);
 383                         continue;
 384                 }
 385
 386                 inet_ntop(AF_INET, &sin.sin_addr, addr_str, sizeof(addr_str));
 387
 388                 interface_recv_msg(iface, addr_str, buf, len);
 389         } while (1);
 390 }
 391
 392
 393 static void interface_recv_v6(struct uloop_fd *u, unsigned int events){
 394         static char buf[APMGR_BUFLEN];
 395         static char cmsg_buf[( CMSG_SPACE(sizeof(struct in6_pktinfo)) + sizeof(int)) + 1];
 396         static struct sockaddr_in6 sin;
 397         static struct iovec iov = {
 398                 .iov_base = buf,
 399                 .iov_len = sizeof(buf)
 400         };
 401         static struct msghdr msg = {
 402                 .msg_name = &sin,
 403                 .msg_namelen = sizeof(sin),
 404                 .msg_iov = &iov,
 405                 .msg_iovlen = 1,
 406                 .msg_control = cmsg_buf,
 407                 .msg_controllen = sizeof(cmsg_buf),
 408         };
 409         struct cmsghdr *cmsg;
 410         char addr_str[INET6_ADDRSTRLEN];
 411         int len;
 412
 413         do {
 414                 struct in6_pktinfo *pkti = NULL;
 415                 struct interface *iface;
 416
 417                 len = recvmsg(u->fd, &msg, 0);
 418                 if (len < 0) {
 419                         switch (errno) {
 420                         case EAGAIN:
 421                                 return;
 422                         case EINTR:
 423                                 continue;
 424                         default:
 425                                 perror("recvmsg");
 426                                 uloop_fd_delete(u);
 427                                 return;
 428                         }
 429                 }
 430
 431                 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
 432                         if (cmsg->cmsg_type != IPV6_PKTINFO)
 433                                 continue;
 434
 435                         pkti = (struct in6_pktinfo *) CMSG_DATA(cmsg);
 436                 }
 437
 438                 if (!pkti) {
 439                         MSG(DEBUG, "Received packet without ifindex\n");
 440                         continue;
 441                 }
 442
 443                 iface = interface_find_by_ifindex(pkti->ipi6_ifindex);
 444                 if (!iface) {
 445                         MSG(DEBUG, "Received packet from unconfigured interface %d\n", pkti->ipi6_ifindex);
 446                         continue;
 447                 }
 448
 449                 inet_ntop(AF_INET6, &sin.sin6_addr, addr_str, sizeof(addr_str));
 450                 if (sin.sin6_addr.s6_addr[0] == 0) {
 451                         /* IPv4 mapped address. Ignore. */
 452                         continue;
 453                 }
 454
 455                 interface_recv_msg(iface, addr_str, buf, len);
 456         } while (1);
 457 }
 458
 459 static void interface_send_msg_v4(struct interface *iface, struct blob_attr *data)
 460 {
 461         static size_t cmsg_data[( CMSG_SPACE(sizeof(struct in_pktinfo)) / sizeof(size_t)) + 1];
 462         static struct sockaddr_in a;
 463         static struct iovec iov;
 464         static struct msghdr m = {
 465                 .msg_name = (struct sockaddr *) &a,
 466                 .msg_namelen = sizeof(a),
 467                 .msg_iov = &iov,
 468                 .msg_iovlen = 1,
 469                 .msg_control = cmsg_data,
 470                 .msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo)),
 471         };
 472         struct in_pktinfo *pkti;
 473         struct cmsghdr *cmsg;
 474
 475         a.sin_family = AF_INET;
 476         a.sin_port = htons(APMGR_PORT);
 477         a.sin_addr.s_addr = ~0;
 478
 479         memset(cmsg_data, 0, sizeof(cmsg_data));
 480         cmsg = CMSG_FIRSTHDR(&m);
 481         cmsg->cmsg_len = m.msg_controllen;
 482         cmsg->cmsg_level = IPPROTO_IP;
 483         cmsg->cmsg_type = IP_PKTINFO;
 484
 485         pkti = (struct in_pktinfo *) CMSG_DATA(cmsg);
 486         pkti->ipi_ifindex = iface->ifindex;
 487
 488         iov.iov_base = data;
 489         iov.iov_len = blob_pad_len(data);
 490
 491         if (sendmsg(remote_fd.fd, &m, 0) < 0)
 492                 perror("sendmsg");
 493 }
 494
 495
 496 static void interface_send_msg_v6(struct interface *iface, struct blob_attr *data) {
 497         static struct sockaddr_in6 groupSock = {};
 498
 499         groupSock.sin6_family = AF_INET6;
 500         inet_pton(AF_INET6, APMGR_V6_MCAST_GROUP, &groupSock.sin6_addr);
 501         groupSock.sin6_port = htons(APMGR_PORT);
 502
 503         setsockopt(remote_fd.fd, IPPROTO_IPV6, IPV6_MULTICAST_IF, &iface->ifindex, sizeof(iface->ifindex));
 504
 505         if (sendto(remote_fd.fd, data, blob_pad_len(data), 0, (const struct sockaddr *)&groupSock, sizeof(groupSock)) < 0)
 506                 perror("sendmsg");
 507 }
 508
 509 static void interface_send_msg(struct interface *iface, struct blob_attr *data){
 510         if (config.ipv6) {
 511                 interface_send_msg_v6(iface, data);
 512         } else {
 513                 interface_send_msg_v4(iface, data);
 514         }
 515 }
 516
 517 static void usteer_send_sta_info(struct sta_info *sta)
 518 {
 519         int seen = current_time - sta->seen;
 520         void *c;
 521
 522         c = blob_nest_start(&buf, 0);
 523         blob_put(&buf, APMSG_STA_ADDR, sta->sta->addr, 6);
 524         blob_put_int8(&buf, APMSG_STA_CONNECTED, !!sta->connected);
 525         blob_put_int32(&buf, APMSG_STA_SIGNAL, sta->signal);
 526         blob_put_int32(&buf, APMSG_STA_SEEN, seen);
 527         blob_put_int32(&buf, APMSG_STA_TIMEOUT, config.local_sta_timeout - seen);
 528         blob_nest_end(&buf, c);
 529 }
 530
 531 static void usteer_send_node(struct usteer_node *node, struct sta_info *sta)
 532 {
 533         void *c, *s, *r;
 534
 535         c = blob_nest_start(&buf, 0);
 536
 537         blob_put_string(&buf, APMSG_NODE_NAME, usteer_node_name(node));
 538         blob_put_string(&buf, APMSG_NODE_SSID, node->ssid);
 539         blob_put_int32(&buf, APMSG_NODE_FREQ, node->freq);
 540         blob_put_int32(&buf, APMSG_NODE_NOISE, node->noise);
 541         blob_put_int32(&buf, APMSG_NODE_LOAD, node->load);
 542         blob_put_int32(&buf, APMSG_NODE_N_ASSOC, node->n_assoc);
 543         blob_put_int32(&buf, APMSG_NODE_MAX_ASSOC, node->max_assoc);
 544         blob_put(&buf, APMSG_NODE_BSSID, node->bssid, sizeof(node->bssid));
 545         if (node->rrm_nr) {
 546                 r = blob_nest_start(&buf, APMSG_NODE_RRM_NR);
 547                 blobmsg_add_field(&buf, BLOBMSG_TYPE_ARRAY, "",
 548                                   blobmsg_data(node->rrm_nr),
 549                                   blobmsg_data_len(node->rrm_nr));
 550                 blob_nest_end(&buf, r);
 551         }
 552
 553         if (node->node_info)
 554                 blob_put(&buf, APMSG_NODE_NODE_INFO,
 555                          blob_data(node->node_info),
 556                          blob_len(node->node_info));
 557
 558         s = blob_nest_start(&buf, APMSG_NODE_STATIONS);
 559
 560         if (sta) {
 561                 usteer_send_sta_info(sta);
 562         } else {
 563                 list_for_each_entry(sta, &node->sta_info, node_list)
 564                         usteer_send_sta_info(sta);
 565         }
 566
 567         blob_nest_end(&buf, s);
 568
 569         blob_nest_end(&buf, c);
 570 }
 571
 572 static void
 573 usteer_check_timeout(void)
 574 {
 575         struct usteer_remote_node *node, *tmp;
 576         int timeout = config.remote_node_timeout;
 577
 578         list_for_each_entry_safe(node, tmp, &remote_nodes, list) {
 579                 if (node->check++ > timeout)
 580                         remote_node_free(node);
 581         }
 582 }
 583
 584 static void *
 585 usteer_update_init(void)
 586 {
 587         blob_buf_init(&buf, 0);
 588         blob_put_int32(&buf, APMSG_ID, local_id);
 589         blob_put_int32(&buf, APMSG_SEQ, ++msg_seq);
 590         if (host_info_blob)
 591                 blob_put(&buf, APMSG_HOST_INFO,
 592                          blob_data(host_info_blob),
 593                          blob_len(host_info_blob));
 594
 595         return blob_nest_start(&buf, APMSG_NODES);
 596 }
 597
 598 static void
 599 usteer_update_send(void *c)
 600 {
 601         struct interface *iface;
 602
 603         blob_nest_end(&buf, c);
 604
 605         vlist_for_each_element(&interfaces, iface, node)
 606                 interface_send_msg(iface, buf.head);
 607 }
 608
 609 void
 610 usteer_send_sta_update(struct sta_info *si)
 611 {
 612         void *c = usteer_update_init();
 613         usteer_send_node(si->node, si);
 614         usteer_update_send(c);
 615 }
 616
 617 static void
 618 usteer_send_update_timer(struct uloop_timeout *t)
 619 {
 620         struct usteer_node *node;
 621         void *c;
 622
 623         if (avl_is_empty(&local_nodes) && !host_info_blob)
 624                 return;
 625
 626         usteer_update_time();
 627         uloop_timeout_set(t, config.remote_update_interval);
 628
 629         c = usteer_update_init();
 630         for_each_local_node(node)
 631                 usteer_send_node(node, NULL);
 632
 633         usteer_update_send(c);
 634         usteer_check_timeout();
 635 }
 636
 637 static int
 638 usteer_init_local_id(void)
 639 {
 640         FILE *f;
 641
 642         f = fopen("/dev/urandom", "r");
 643         if (!f) {
 644                 perror("fopen(/dev/urandom)");
 645                 return -1;
 646         }
 647
 648         if (fread(&local_id, sizeof(local_id), 1, f) < 1)
 649                 return -1;
 650
 651         fclose(f);
 652         return 0;
 653 }
 654
 655 static int usteer_create_v4_socket() {
 656         int yes = 1;
 657         int fd;
 658
 659         fd = usock(USOCK_UDP | USOCK_SERVER | USOCK_NONBLOCK |
 660                    USOCK_NUMERIC | USOCK_IPV4ONLY,
 661                    "0.0.0.0", APMGR_PORT_STR);
 662         if (fd < 0) {
 663                 perror("usock");
 664                 return - 1;
 665         }
 666
 667         if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &yes, sizeof(yes)) < 0)
 668                 perror("setsockopt(IP_PKTINFO)");
 669
 670         if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &yes, sizeof(yes)) < 0)
 671                 perror("setsockopt(SO_BROADCAST)");
 672
 673         return fd;
 674 }
 675
 676
 677 static int usteer_create_v6_socket() {
 678         struct interface *iface;
 679         struct ipv6_mreq group;
 680         int yes = 1;
 681         int fd;
 682
 683         fd = usock(USOCK_UDP | USOCK_SERVER | USOCK_NONBLOCK |
 684                    USOCK_NUMERIC | USOCK_IPV6ONLY,
 685                    "::", APMGR_PORT_STR);
 686         if (fd < 0) {
 687                 perror("usock");
 688                 return fd;
 689         }
 690
 691         if (!inet_pton(AF_INET6, APMGR_V6_MCAST_GROUP, &group.ipv6mr_multiaddr.s6_addr))
 692                 perror("inet_pton(AF_INET6)");
 693
 694         /* Membership has to be added for every interface we listen on. */
 695         vlist_for_each_element(&interfaces, iface, node) {
 696                 group.ipv6mr_interface = iface->ifindex;
 697                 if(setsockopt(fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, (char *)&group, sizeof group) < 0)
 698                         perror("setsockopt(IPV6_ADD_MEMBERSHIP)");
 699         }
 700
 701         if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &yes, sizeof(yes)) < 0)
 702                 perror("setsockopt(IPV6_RECVPKTINFO)");
 703
 704         if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &yes, sizeof(yes)) < 0)
 705                 perror("setsockopt(SO_BROADCAST)");
 706
 707         return fd;
 708 }
 709
 710 static void usteer_reload_timer(struct uloop_timeout *t) {
 711         /* Remove uloop descriptor */
 712         if (remote_fd.fd && remote_fd.registered) {
 713                 uloop_fd_delete(&remote_fd);
 714                 close(remote_fd.fd);
 715         }
 716
 717         if (config.ipv6) {
 718                 remote_fd.fd = usteer_create_v6_socket();
 719                 remote_fd.cb = interface_recv_v6;
 720         } else {
 721                 remote_fd.fd = usteer_create_v4_socket();
 722                 remote_fd.cb = interface_recv_v4;
 723         }
 724
 725         if (remote_fd.fd < 0)
 726                 return;
 727
 728         uloop_fd_add(&remote_fd, ULOOP_READ);
 729 }
 730
 731 int usteer_interface_init(void)
 732 {
 733         if (usteer_init_local_id())
 734                 return -1;
 735
 736         remote_timer.cb = usteer_send_update_timer;
 737         remote_timer.cb(&remote_timer);
 738
 739         reload_timer.cb = usteer_reload_timer;
 740         reload_timer.cb(&reload_timer);
 741
 742         return 0;
 743 }