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 #define _GNU_SOURCE
  21
  22 #include <sys/types.h>
  23 #include <sys/socket.h>
  24 #include <netinet/in.h>
  25 #include <net/if.h>
  26 #include <arpa/inet.h>
  27 #include <errno.h>
  28 #include <unistd.h>
  29
  30 #include <libubox/vlist.h>
  31 #include <libubox/avl-cmp.h>
  32 #include <libubox/usock.h>
  33 #include "usteer.h"
  34 #include "remote.h"
  35 #include "node.h"
  36
  37 static uint32_t local_id;
  38 static struct uloop_fd remote_fd;
  39 static struct uloop_timeout remote_timer;
  40 static struct uloop_timeout reload_timer;
  41
  42 static struct blob_buf buf;
  43 static uint32_t msg_seq;
  44
  45 struct interface {
  46         struct vlist_node node;
  47         int ifindex;
  48 };
  49
  50 static void
  51 interfaces_update_cb(struct vlist_tree *tree,
  52                      struct vlist_node *node_new,
  53                      struct vlist_node *node_old);
  54
  55 static int remote_host_cmp(const void *k1, const void *k2, void *ptr)
  56 {
  57         unsigned long v1 = (unsigned long) k1;
  58         unsigned long v2 = (unsigned long) k2;
  59
  60         return v2 - v1;
  61 }
  62
  63 static VLIST_TREE(interfaces, avl_strcmp, interfaces_update_cb, true, true);
  64 LIST_HEAD(remote_nodes);
  65 AVL_TREE(remote_hosts, remote_host_cmp, false, NULL);
  66
  67 static const char *
  68 interface_name(struct interface *iface)
  69 {
  70         return iface->node.avl.key;
  71 }
  72
  73 static void
  74 interface_check(struct interface *iface)
  75 {
  76         iface->ifindex = if_nametoindex(interface_name(iface));
  77         uloop_timeout_set(&reload_timer, 1);
  78 }
  79
  80 static void
  81 interface_init(struct interface *iface)
  82 {
  83         interface_check(iface);
  84 }
  85
  86 static void
  87 interface_free(struct interface *iface)
  88 {
  89         avl_delete(&interfaces.avl, &iface->node.avl);
  90         free(iface);
  91 }
  92
  93 static void
  94 interfaces_update_cb(struct vlist_tree *tree,
  95                      struct vlist_node *node_new,
  96                      struct vlist_node *node_old)
  97 {
  98         struct interface *iface;
  99
 100         if (node_new && node_old) {
 101                 iface = container_of(node_new, struct interface, node);
 102                 free(iface);
 103                 iface = container_of(node_old, struct interface, node);
 104                 interface_check(iface);
 105         } else if (node_old) {
 106                 iface = container_of(node_old, struct interface, node);
 107                 interface_free(iface);
 108         } else {
 109                 iface = container_of(node_new, struct interface, node);
 110                 interface_init(iface);
 111         }
 112 }
 113
 114 void usteer_interface_add(const char *name)
 115 {
 116         struct interface *iface;
 117         char *name_buf;
 118
 119         iface = calloc_a(sizeof(*iface), &name_buf, strlen(name) + 1);
 120         strcpy(name_buf, name);
 121         vlist_add(&interfaces, &iface->node, name_buf);
 122 }
 123
 124 void config_set_interfaces(struct blob_attr *data)
 125 {
 126         struct blob_attr *cur;
 127         int rem;
 128
 129         if (!data)
 130                 return;
 131
 132         if (!blobmsg_check_attr_list(data, BLOBMSG_TYPE_STRING))
 133                 return;
 134
 135         vlist_update(&interfaces);
 136         blobmsg_for_each_attr(cur, data, rem) {
 137                 usteer_interface_add(blobmsg_data(cur));
 138         }
 139         vlist_flush(&interfaces);
 140 }
 141
 142 void config_get_interfaces(struct blob_buf *buf)
 143 {
 144         struct interface *iface;
 145         void *c;
 146
 147         c = blobmsg_open_array(buf, "interfaces");
 148         vlist_for_each_element(&interfaces, iface, node) {
 149                 blobmsg_add_string(buf, NULL, interface_name(iface));
 150         }
 151         blobmsg_close_array(buf, c);
 152 }
 153
 154 static void
 155 interface_add_station(struct usteer_remote_node *node, struct blob_attr *data)
 156 {
 157         struct sta *sta;
 158         struct sta_info *si;
 159         struct apmsg_sta msg;
 160         bool create;
 161
 162         if (!parse_apmsg_sta(&msg, data)) {
 163                 MSG(DEBUG, "Cannot parse station in message\n");
 164                 return;
 165         }
 166
 167         if (msg.timeout <= 0) {
 168                 MSG(DEBUG, "Refuse to add an already expired station entry\n");
 169                 return;
 170         }
 171
 172         sta = usteer_sta_get(msg.addr, true);
 173         if (!sta)
 174                 return;
 175
 176         si = usteer_sta_info_get(sta, &node->node, &create);
 177         if (!si)
 178                 return;
 179
 180         si->connected = msg.connected;
 181         si->signal = msg.signal;
 182         si->seen = current_time - msg.seen;
 183         usteer_sta_info_update_timeout(si, msg.timeout);
 184 }
 185
 186 static void
 187 remote_node_free(struct usteer_remote_node *node)
 188 {
 189         struct usteer_remote_host *host = node->host;
 190
 191         list_del(&node->list);
 192         list_del(&node->host_list);
 193         usteer_sta_node_cleanup(&node->node);
 194         free(node);
 195
 196         if (!list_empty(&host->nodes))
 197                 return;
 198
 199         avl_delete(&remote_hosts, &host->avl);
 200         free(host->addr);
 201         free(host);
 202 }
 203
 204 static struct usteer_remote_host *
 205 interface_get_host(const char *addr, unsigned long id)
 206 {
 207         struct usteer_remote_host *host;
 208
 209         host = avl_find_element(&remote_hosts, (void *)id, host, avl);
 210         if (host)
 211                 goto out;
 212
 213         host = calloc(1, sizeof(*host));
 214         host->avl.key = (void *)id;
 215         INIT_LIST_HEAD(&host->nodes);
 216         avl_insert(&remote_hosts, &host->avl);
 217
 218 out:
 219         if (host->addr && !strcmp(host->addr, addr))
 220                 return host;
 221
 222         free(host->addr);
 223         host->addr = strdup(addr);
 224
 225         return host;
 226 }
 227
 228 static struct usteer_remote_node *
 229 interface_get_node(struct usteer_remote_host *host, const char *name)
 230 {
 231         struct usteer_remote_node *node;
 232         int addr_len = strlen(host->addr);
 233         char *buf;
 234
 235         list_for_each_entry(node, &host->nodes, host_list)
 236                 if (!strcmp(node->name, name))
 237                         return node;
 238
 239         node = calloc_a(sizeof(*node), &buf, addr_len + 1 + strlen(name) + 1);
 240         node->node.type = NODE_TYPE_REMOTE;
 241
 242         sprintf(buf, "%s#%s", host->addr, name);
 243         node->node.avl.key = buf;
 244         node->name = buf + addr_len + 1;
 245         node->host = host;
 246         INIT_LIST_HEAD(&node->node.sta_info);
 247
 248         list_add_tail(&node->list, &remote_nodes);
 249         list_add_tail(&node->host_list, &host->nodes);
 250
 251         return node;
 252 }
 253
 254 static void
 255 interface_add_node(struct usteer_remote_host *host, struct blob_attr *data)
 256 {
 257         struct usteer_remote_node *node;
 258         struct apmsg_node msg;
 259         struct blob_attr *cur;
 260         int rem;
 261
 262         if (!parse_apmsg_node(&msg, data)) {
 263                 MSG(DEBUG, "Cannot parse node in message\n");
 264                 return;
 265         }
 266
 267         node = interface_get_node(host, msg.name);
 268         node->check = 0;
 269         node->node.freq = msg.freq;
 270         node->node.n_assoc = msg.n_assoc;
 271         node->node.max_assoc = msg.max_assoc;
 272         node->node.noise = msg.noise;
 273         node->node.load = msg.load;
 274
 275         memcpy(node->node.bssid, msg.bssid, sizeof(node->node.bssid));
 276
 277         snprintf(node->node.ssid, sizeof(node->node.ssid), "%s", msg.ssid);
 278         usteer_node_set_blob(&node->node.rrm_nr, msg.rrm_nr);
 279         usteer_node_set_blob(&node->node.node_info, msg.node_info);
 280
 281         blob_for_each_attr(cur, msg.stations, rem)
 282                 interface_add_station(node, cur);
 283 }
 284
 285 static void
 286 interface_recv_msg(struct interface *iface, char *addr_str, void *buf, int len)
 287 {
 288         struct usteer_remote_host *host;
 289         struct blob_attr *data = buf;
 290         struct apmsg msg;
 291         struct blob_attr *cur;
 292         int rem;
 293
 294         if (blob_pad_len(data) != len) {
 295                 MSG(DEBUG, "Invalid message length (header: %d, real: %d)\n", blob_pad_len(data), len);
 296                 return;
 297         }
 298
 299         if (!parse_apmsg(&msg, data)) {
 300                 MSG(DEBUG, "Missing fields in message\n");
 301                 return;
 302         }
 303
 304         if (msg.id == local_id)
 305                 return;
 306
 307         MSG(NETWORK, "Received message on %s (id=%08x->%08x seq=%d len=%d)\n",
 308                 interface_name(iface), msg.id, local_id, msg.seq, len);
 309
 310         host = interface_get_host(addr_str, msg.id);
 311         usteer_node_set_blob(&host->host_info, msg.host_info);
 312
 313         blob_for_each_attr(cur, msg.nodes, rem)
 314                 interface_add_node(host, cur);
 315 }
 316
 317 static struct interface *
 318 interface_find_by_ifindex(int index)
 319 {
 320         struct interface *iface;
 321
 322         vlist_for_each_element(&interfaces, iface, node) {
 323                 if (iface->ifindex == index)
 324                         return iface;
 325         }
 326
 327         return NULL;
 328 }
 329
 330 static void
 331 interface_recv_v4(struct uloop_fd *u, unsigned int events)
 332 {
 333         static char buf[APMGR_BUFLEN];
 334         static char cmsg_buf[( CMSG_SPACE(sizeof(struct in_pktinfo)) + sizeof(int)) + 1];
 335         static struct sockaddr_in sin;
 336         char addr_str[INET_ADDRSTRLEN];
 337         static struct iovec iov = {
 338                 .iov_base = buf,
 339                 .iov_len = sizeof(buf)
 340         };
 341         static struct msghdr msg = {
 342                 .msg_name = &sin,
 343                 .msg_namelen = sizeof(sin),
 344                 .msg_iov = &iov,
 345                 .msg_iovlen = 1,
 346                 .msg_control = cmsg_buf,
 347                 .msg_controllen = sizeof(cmsg_buf),
 348         };
 349         struct cmsghdr *cmsg;
 350         int len;
 351
 352         do {
 353                 struct in_pktinfo *pkti = NULL;
 354                 struct interface *iface;
 355
 356                 len = recvmsg(u->fd, &msg, 0);
 357                 if (len < 0) {
 358                         switch (errno) {
 359                         case EAGAIN:
 360                                 return;
 361                         case EINTR:
 362                                 continue;
 363                         default:
 364                                 perror("recvmsg");
 365                                 uloop_fd_delete(u);
 366                                 return;
 367                         }
 368                 }
 369
 370                 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
 371                         if (cmsg->cmsg_type != IP_PKTINFO)
 372                                 continue;
 373
 374                         pkti = (struct in_pktinfo *) CMSG_DATA(cmsg);
 375                 }
 376
 377                 if (!pkti) {
 378                         MSG(DEBUG, "Received packet without ifindex\n");
 379                         continue;
 380                 }
 381
 382                 iface = interface_find_by_ifindex(pkti->ipi_ifindex);
 383                 if (!iface) {
 384                         MSG(DEBUG, "Received packet from unconfigured interface %d\n", pkti->ipi_ifindex);
 385                         continue;
 386                 }
 387
 388                 inet_ntop(AF_INET, &sin.sin_addr, addr_str, sizeof(addr_str));
 389
 390                 interface_recv_msg(iface, addr_str, buf, len);
 391         } while (1);
 392 }
 393
 394
 395 static void interface_recv_v6(struct uloop_fd *u, unsigned int events){
 396         static char buf[APMGR_BUFLEN];
 397         static char cmsg_buf[( CMSG_SPACE(sizeof(struct in6_pktinfo)) + sizeof(int)) + 1];
 398         static struct sockaddr_in6 sin;
 399         static struct iovec iov = {
 400                 .iov_base = buf,
 401                 .iov_len = sizeof(buf)
 402         };
 403         static struct msghdr msg = {
 404                 .msg_name = &sin,
 405                 .msg_namelen = sizeof(sin),
 406                 .msg_iov = &iov,
 407                 .msg_iovlen = 1,
 408                 .msg_control = cmsg_buf,
 409                 .msg_controllen = sizeof(cmsg_buf),
 410         };
 411         struct cmsghdr *cmsg;
 412         char addr_str[INET6_ADDRSTRLEN];
 413         int len;
 414
 415         do {
 416                 struct in6_pktinfo *pkti = NULL;
 417                 struct interface *iface;
 418
 419                 len = recvmsg(u->fd, &msg, 0);
 420                 if (len < 0) {
 421                         switch (errno) {
 422                         case EAGAIN:
 423                                 return;
 424                         case EINTR:
 425                                 continue;
 426                         default:
 427                                 perror("recvmsg");
 428                                 uloop_fd_delete(u);
 429                                 return;
 430                         }
 431                 }
 432
 433                 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
 434                         if (cmsg->cmsg_type != IPV6_PKTINFO)
 435                                 continue;
 436
 437                         pkti = (struct in6_pktinfo *) CMSG_DATA(cmsg);
 438                 }
 439
 440                 if (!pkti) {
 441                         MSG(DEBUG, "Received packet without ifindex\n");
 442                         continue;
 443                 }
 444
 445                 iface = interface_find_by_ifindex(pkti->ipi6_ifindex);
 446                 if (!iface) {
 447                         MSG(DEBUG, "Received packet from unconfigured interface %d\n", pkti->ipi6_ifindex);
 448                         continue;
 449                 }
 450
 451                 inet_ntop(AF_INET6, &sin.sin6_addr, addr_str, sizeof(addr_str));
 452                 if (sin.sin6_addr.s6_addr[0] == 0) {
 453                         /* IPv4 mapped address. Ignore. */
 454                         continue;
 455                 }
 456
 457                 interface_recv_msg(iface, addr_str, buf, len);
 458         } while (1);
 459 }
 460
 461 static void interface_send_msg_v4(struct interface *iface, struct blob_attr *data)
 462 {
 463         static size_t cmsg_data[( CMSG_SPACE(sizeof(struct in_pktinfo)) / sizeof(size_t)) + 1];
 464         static struct sockaddr_in a;
 465         static struct iovec iov;
 466         static struct msghdr m = {
 467                 .msg_name = (struct sockaddr *) &a,
 468                 .msg_namelen = sizeof(a),
 469                 .msg_iov = &iov,
 470                 .msg_iovlen = 1,
 471                 .msg_control = cmsg_data,
 472                 .msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo)),
 473         };
 474         struct in_pktinfo *pkti;
 475         struct cmsghdr *cmsg;
 476
 477         a.sin_family = AF_INET;
 478         a.sin_port = htons(APMGR_PORT);
 479         a.sin_addr.s_addr = ~0;
 480
 481         memset(cmsg_data, 0, sizeof(cmsg_data));
 482         cmsg = CMSG_FIRSTHDR(&m);
 483         cmsg->cmsg_len = m.msg_controllen;
 484         cmsg->cmsg_level = IPPROTO_IP;
 485         cmsg->cmsg_type = IP_PKTINFO;
 486
 487         pkti = (struct in_pktinfo *) CMSG_DATA(cmsg);
 488         pkti->ipi_ifindex = iface->ifindex;
 489
 490         iov.iov_base = data;
 491         iov.iov_len = blob_pad_len(data);
 492
 493         if (sendmsg(remote_fd.fd, &m, 0) < 0)
 494                 perror("sendmsg");
 495 }
 496
 497
 498 static void interface_send_msg_v6(struct interface *iface, struct blob_attr *data) {
 499         static struct sockaddr_in6 groupSock = {};
 500
 501         groupSock.sin6_family = AF_INET6;
 502         inet_pton(AF_INET6, APMGR_V6_MCAST_GROUP, &groupSock.sin6_addr);
 503         groupSock.sin6_port = htons(APMGR_PORT);
 504
 505         setsockopt(remote_fd.fd, IPPROTO_IPV6, IPV6_MULTICAST_IF, &iface->ifindex, sizeof(iface->ifindex));
 506
 507         if (sendto(remote_fd.fd, data, blob_pad_len(data), 0, (const struct sockaddr *)&groupSock, sizeof(groupSock)) < 0)
 508                 perror("sendmsg");
 509 }
 510
 511 static void interface_send_msg(struct interface *iface, struct blob_attr *data){
 512         if (config.ipv6) {
 513                 interface_send_msg_v6(iface, data);
 514         } else {
 515                 interface_send_msg_v4(iface, data);
 516         }
 517 }
 518
 519 static void usteer_send_sta_info(struct sta_info *sta)
 520 {
 521         int seen = current_time - sta->seen;
 522         void *c;
 523
 524         c = blob_nest_start(&buf, 0);
 525         blob_put(&buf, APMSG_STA_ADDR, sta->sta->addr, 6);
 526         blob_put_int8(&buf, APMSG_STA_CONNECTED, !!sta->connected);
 527         blob_put_int32(&buf, APMSG_STA_SIGNAL, sta->signal);
 528         blob_put_int32(&buf, APMSG_STA_SEEN, seen);
 529         blob_put_int32(&buf, APMSG_STA_TIMEOUT, config.local_sta_timeout - seen);
 530         blob_nest_end(&buf, c);
 531 }
 532
 533 static void usteer_send_node(struct usteer_node *node, struct sta_info *sta)
 534 {
 535         void *c, *s, *r;
 536
 537         c = blob_nest_start(&buf, 0);
 538
 539         blob_put_string(&buf, APMSG_NODE_NAME, usteer_node_name(node));
 540         blob_put_string(&buf, APMSG_NODE_SSID, node->ssid);
 541         blob_put_int32(&buf, APMSG_NODE_FREQ, node->freq);
 542         blob_put_int32(&buf, APMSG_NODE_NOISE, node->noise);
 543         blob_put_int32(&buf, APMSG_NODE_LOAD, node->load);
 544         blob_put_int32(&buf, APMSG_NODE_N_ASSOC, node->n_assoc);
 545         blob_put_int32(&buf, APMSG_NODE_MAX_ASSOC, node->max_assoc);
 546         blob_put(&buf, APMSG_NODE_BSSID, node->bssid, sizeof(node->bssid));
 547         if (node->rrm_nr) {
 548                 r = blob_nest_start(&buf, APMSG_NODE_RRM_NR);
 549                 blobmsg_add_field(&buf, BLOBMSG_TYPE_ARRAY, "",
 550                                   blobmsg_data(node->rrm_nr),
 551                                   blobmsg_data_len(node->rrm_nr));
 552                 blob_nest_end(&buf, r);
 553         }
 554
 555         if (node->node_info)
 556                 blob_put(&buf, APMSG_NODE_NODE_INFO,
 557                          blob_data(node->node_info),
 558                          blob_len(node->node_info));
 559
 560         s = blob_nest_start(&buf, APMSG_NODE_STATIONS);
 561
 562         if (sta) {
 563                 usteer_send_sta_info(sta);
 564         } else {
 565                 list_for_each_entry(sta, &node->sta_info, node_list)
 566                         usteer_send_sta_info(sta);
 567         }
 568
 569         blob_nest_end(&buf, s);
 570
 571         blob_nest_end(&buf, c);
 572 }
 573
 574 static void
 575 usteer_check_timeout(void)
 576 {
 577         struct usteer_remote_node *node, *tmp;
 578         int timeout = config.remote_node_timeout;
 579
 580         list_for_each_entry_safe(node, tmp, &remote_nodes, list) {
 581                 if (node->check++ > timeout)
 582                         remote_node_free(node);
 583         }
 584 }
 585
 586 static void *
 587 usteer_update_init(void)
 588 {
 589         blob_buf_init(&buf, 0);
 590         blob_put_int32(&buf, APMSG_ID, local_id);
 591         blob_put_int32(&buf, APMSG_SEQ, ++msg_seq);
 592         if (host_info_blob)
 593                 blob_put(&buf, APMSG_HOST_INFO,
 594                          blob_data(host_info_blob),
 595                          blob_len(host_info_blob));
 596
 597         return blob_nest_start(&buf, APMSG_NODES);
 598 }
 599
 600 static void
 601 usteer_update_send(void *c)
 602 {
 603         struct interface *iface;
 604
 605         blob_nest_end(&buf, c);
 606
 607         vlist_for_each_element(&interfaces, iface, node)
 608                 interface_send_msg(iface, buf.head);
 609 }
 610
 611 void
 612 usteer_send_sta_update(struct sta_info *si)
 613 {
 614         void *c = usteer_update_init();
 615         usteer_send_node(si->node, si);
 616         usteer_update_send(c);
 617 }
 618
 619 static void
 620 usteer_send_update_timer(struct uloop_timeout *t)
 621 {
 622         struct usteer_node *node;
 623         void *c;
 624
 625         usteer_update_time();
 626         uloop_timeout_set(t, config.remote_update_interval);
 627
 628         if (!avl_is_empty(&local_nodes) || host_info_blob) {
 629                 c = usteer_update_init();
 630                 for_each_local_node(node)
 631                         usteer_send_node(node, NULL);
 632
 633                 usteer_update_send(c);
 634         }
 635         usteer_check_timeout();
 636 }
 637
 638 static int
 639 usteer_init_local_id(void)
 640 {
 641         FILE *f;
 642
 643         f = fopen("/dev/urandom", "r");
 644         if (!f) {
 645                 perror("fopen(/dev/urandom)");
 646                 return -1;
 647         }
 648
 649         if (fread(&local_id, sizeof(local_id), 1, f) < 1)
 650                 return -1;
 651
 652         fclose(f);
 653         return 0;
 654 }
 655
 656 static int usteer_create_v4_socket() {
 657         int yes = 1;
 658         int fd;
 659
 660         fd = usock(USOCK_UDP | USOCK_SERVER | USOCK_NONBLOCK |
 661                    USOCK_NUMERIC | USOCK_IPV4ONLY,
 662                    "0.0.0.0", APMGR_PORT_STR);
 663         if (fd < 0) {
 664                 perror("usock");
 665                 return - 1;
 666         }
 667
 668         if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &yes, sizeof(yes)) < 0)
 669                 perror("setsockopt(IP_PKTINFO)");
 670
 671         if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &yes, sizeof(yes)) < 0)
 672                 perror("setsockopt(SO_BROADCAST)");
 673
 674         return fd;
 675 }
 676
 677
 678 static int usteer_create_v6_socket() {
 679         struct interface *iface;
 680         struct ipv6_mreq group;
 681         int yes = 1;
 682         int fd;
 683
 684         fd = usock(USOCK_UDP | USOCK_SERVER | USOCK_NONBLOCK |
 685                    USOCK_NUMERIC | USOCK_IPV6ONLY,
 686                    "::", APMGR_PORT_STR);
 687         if (fd < 0) {
 688                 perror("usock");
 689                 return fd;
 690         }
 691
 692         if (!inet_pton(AF_INET6, APMGR_V6_MCAST_GROUP, &group.ipv6mr_multiaddr.s6_addr))
 693                 perror("inet_pton(AF_INET6)");
 694
 695         /* Membership has to be added for every interface we listen on. */
 696         vlist_for_each_element(&interfaces, iface, node) {
 697                 group.ipv6mr_interface = iface->ifindex;
 698                 if(setsockopt(fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, (char *)&group, sizeof group) < 0)
 699                         perror("setsockopt(IPV6_ADD_MEMBERSHIP)");
 700         }
 701
 702         if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &yes, sizeof(yes)) < 0)
 703                 perror("setsockopt(IPV6_RECVPKTINFO)");
 704
 705         if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &yes, sizeof(yes)) < 0)
 706                 perror("setsockopt(SO_BROADCAST)");
 707
 708         return fd;
 709 }
 710
 711 static void usteer_reload_timer(struct uloop_timeout *t) {
 712         /* Remove uloop descriptor */
 713         if (remote_fd.fd && remote_fd.registered) {
 714                 uloop_fd_delete(&remote_fd);
 715                 close(remote_fd.fd);
 716         }
 717
 718         if (config.ipv6) {
 719                 remote_fd.fd = usteer_create_v6_socket();
 720                 remote_fd.cb = interface_recv_v6;
 721         } else {
 722                 remote_fd.fd = usteer_create_v4_socket();
 723                 remote_fd.cb = interface_recv_v4;
 724         }
 725
 726         if (remote_fd.fd < 0)
 727                 return;
 728
 729         uloop_fd_add(&remote_fd, ULOOP_READ);
 730 }
 731
 732 int usteer_interface_init(void)
 733 {
 734         if (usteer_init_local_id())
 735                 return -1;
 736
 737         remote_timer.cb = usteer_send_update_timer;
 738         remote_timer.cb(&remote_timer);
 739
 740         reload_timer.cb = usteer_reload_timer;
 741         reload_timer.cb(&reload_timer);
 742
 743         return 0;
 744 }