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, *local_si;
 159         struct apmsg_sta msg;
 160         struct usteer_node *local_node;
 161         bool create;
 162         bool connect_change;
 163
 164         if (!parse_apmsg_sta(&msg, data)) {
 165                 MSG(DEBUG, "Cannot parse station in message\n");
 166                 return;
 167         }
 168
 169         if (msg.timeout <= 0) {
 170                 MSG(DEBUG, "Refuse to add an already expired station entry\n");
 171                 return;
 172         }
 173
 174         sta = usteer_sta_get(msg.addr, true);
 175         if (!sta)
 176                 return;
 177
 178         si = usteer_sta_info_get(sta, &node->node, &create);
 179         if (!si)
 180                 return;
 181
 182         connect_change = si->connected != msg.connected;
 183         si->connected = msg.connected;
 184         si->signal = msg.signal;
 185         si->seen = current_time - msg.seen;
 186         si->last_connected = current_time - msg.last_connected;
 187
 188         /* Check if client roamed to this foreign node */
 189         if ((connect_change || create) && si->connected == STA_CONNECTED) {
 190                 for_each_local_node(local_node) {
 191                         local_si = usteer_sta_info_get(sta, local_node, NULL);
 192                         if (!local_si)
 193                                 continue;
 194
 195                         if (current_time - local_si->last_connected < config.roam_process_timeout) {
 196                                 node->node.roam_events.target++;
 197                                 break;
 198                         }
 199                 }
 200         }
 201
 202         usteer_sta_info_update_timeout(si, msg.timeout);
 203 }
 204
 205 static void
 206 remote_node_free(struct usteer_remote_node *node)
 207 {
 208         struct usteer_remote_host *host = node->host;
 209
 210         list_del(&node->list);
 211         list_del(&node->host_list);
 212         usteer_sta_node_cleanup(&node->node);
 213         usteer_measurement_report_node_cleanup(&node->node);
 214         free(node);
 215
 216         if (!list_empty(&host->nodes))
 217                 return;
 218
 219         avl_delete(&remote_hosts, &host->avl);
 220         free(host->addr);
 221         free(host);
 222 }
 223
 224 static struct usteer_remote_host *
 225 interface_get_host(const char *addr, unsigned long id)
 226 {
 227         struct usteer_remote_host *host;
 228
 229         host = avl_find_element(&remote_hosts, (void *)id, host, avl);
 230         if (host)
 231                 goto out;
 232
 233         host = calloc(1, sizeof(*host));
 234         host->avl.key = (void *)id;
 235         INIT_LIST_HEAD(&host->nodes);
 236         avl_insert(&remote_hosts, &host->avl);
 237
 238 out:
 239         if (host->addr && !strcmp(host->addr, addr))
 240                 return host;
 241
 242         free(host->addr);
 243         host->addr = strdup(addr);
 244
 245         return host;
 246 }
 247
 248 static struct usteer_remote_node *
 249 interface_get_node(struct usteer_remote_host *host, const char *name)
 250 {
 251         struct usteer_remote_node *node;
 252         int addr_len = strlen(host->addr);
 253         char *buf;
 254
 255         list_for_each_entry(node, &host->nodes, host_list)
 256                 if (!strcmp(node->name, name))
 257                         return node;
 258
 259         node = calloc_a(sizeof(*node), &buf, addr_len + 1 + strlen(name) + 1);
 260         node->node.type = NODE_TYPE_REMOTE;
 261         node->node.created = current_time;
 262
 263         sprintf(buf, "%s#%s", host->addr, name);
 264         node->node.avl.key = buf;
 265         node->name = buf + addr_len + 1;
 266         node->host = host;
 267         INIT_LIST_HEAD(&node->node.sta_info);
 268         INIT_LIST_HEAD(&node->node.measurements);
 269
 270         list_add_tail(&node->list, &remote_nodes);
 271         list_add_tail(&node->host_list, &host->nodes);
 272
 273         return node;
 274 }
 275
 276 static void
 277 interface_add_node(struct usteer_remote_host *host, struct blob_attr *data)
 278 {
 279         struct usteer_remote_node *node;
 280         struct apmsg_node msg;
 281         struct blob_attr *cur;
 282         int rem;
 283
 284         if (!parse_apmsg_node(&msg, data)) {
 285                 MSG(DEBUG, "Cannot parse node in message\n");
 286                 return;
 287         }
 288
 289         node = interface_get_node(host, msg.name);
 290         node->check = 0;
 291         node->node.freq = msg.freq;
 292         node->node.channel = msg.channel;
 293         node->node.op_class = msg.op_class;
 294         node->node.n_assoc = msg.n_assoc;
 295         node->node.max_assoc = msg.max_assoc;
 296         node->node.noise = msg.noise;
 297         node->node.load = msg.load;
 298
 299         memcpy(node->node.bssid, msg.bssid, sizeof(node->node.bssid));
 300
 301         snprintf(node->node.ssid, sizeof(node->node.ssid), "%s", msg.ssid);
 302         usteer_node_set_blob(&node->node.rrm_nr, msg.rrm_nr);
 303         usteer_node_set_blob(&node->node.node_info, msg.node_info);
 304
 305         blob_for_each_attr(cur, msg.stations, rem)
 306                 interface_add_station(node, cur);
 307 }
 308
 309 static void
 310 interface_recv_msg(struct interface *iface, char *addr_str, void *buf, int len)
 311 {
 312         struct usteer_remote_host *host;
 313         struct blob_attr *data = buf;
 314         struct apmsg msg;
 315         struct blob_attr *cur;
 316         int rem;
 317
 318         if (blob_pad_len(data) != len) {
 319                 MSG(DEBUG, "Invalid message length (header: %d, real: %d)\n", blob_pad_len(data), len);
 320                 return;
 321         }
 322
 323         if (!parse_apmsg(&msg, data)) {
 324                 MSG(DEBUG, "Missing fields in message\n");
 325                 return;
 326         }
 327
 328         if (msg.id == local_id)
 329                 return;
 330
 331         MSG(NETWORK, "Received message on %s (id=%08x->%08x seq=%d len=%d)\n",
 332                 interface_name(iface), msg.id, local_id, msg.seq, len);
 333
 334         host = interface_get_host(addr_str, msg.id);
 335         usteer_node_set_blob(&host->host_info, msg.host_info);
 336
 337         blob_for_each_attr(cur, msg.nodes, rem)
 338                 interface_add_node(host, cur);
 339 }
 340
 341 static struct interface *
 342 interface_find_by_ifindex(int index)
 343 {
 344         struct interface *iface;
 345
 346         vlist_for_each_element(&interfaces, iface, node) {
 347                 if (iface->ifindex == index)
 348                         return iface;
 349         }
 350
 351         return NULL;
 352 }
 353
 354 static void
 355 interface_recv_v4(struct uloop_fd *u, unsigned int events)
 356 {
 357         static char buf[APMGR_BUFLEN];
 358         static char cmsg_buf[( CMSG_SPACE(sizeof(struct in_pktinfo)) + sizeof(int)) + 1];
 359         static struct sockaddr_in sin;
 360         char addr_str[INET_ADDRSTRLEN];
 361         static struct iovec iov = {
 362                 .iov_base = buf,
 363                 .iov_len = sizeof(buf)
 364         };
 365         static struct msghdr msg = {
 366                 .msg_name = &sin,
 367                 .msg_namelen = sizeof(sin),
 368                 .msg_iov = &iov,
 369                 .msg_iovlen = 1,
 370                 .msg_control = cmsg_buf,
 371                 .msg_controllen = sizeof(cmsg_buf),
 372         };
 373         struct cmsghdr *cmsg;
 374         int len;
 375
 376         do {
 377                 struct in_pktinfo *pkti = NULL;
 378                 struct interface *iface;
 379
 380                 len = recvmsg(u->fd, &msg, 0);
 381                 if (len < 0) {
 382                         switch (errno) {
 383                         case EAGAIN:
 384                                 return;
 385                         case EINTR:
 386                                 continue;
 387                         default:
 388                                 perror("recvmsg");
 389                                 uloop_fd_delete(u);
 390                                 return;
 391                         }
 392                 }
 393
 394                 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
 395                         if (cmsg->cmsg_type != IP_PKTINFO)
 396                                 continue;
 397
 398                         pkti = (struct in_pktinfo *) CMSG_DATA(cmsg);
 399                 }
 400
 401                 if (!pkti) {
 402                         MSG(DEBUG, "Received packet without ifindex\n");
 403                         continue;
 404                 }
 405
 406                 iface = interface_find_by_ifindex(pkti->ipi_ifindex);
 407                 if (!iface) {
 408                         MSG(DEBUG, "Received packet from unconfigured interface %d\n", pkti->ipi_ifindex);
 409                         continue;
 410                 }
 411
 412                 inet_ntop(AF_INET, &sin.sin_addr, addr_str, sizeof(addr_str));
 413
 414                 interface_recv_msg(iface, addr_str, buf, len);
 415         } while (1);
 416 }
 417
 418
 419 static void interface_recv_v6(struct uloop_fd *u, unsigned int events){
 420         static char buf[APMGR_BUFLEN];
 421         static char cmsg_buf[( CMSG_SPACE(sizeof(struct in6_pktinfo)) + sizeof(int)) + 1];
 422         static struct sockaddr_in6 sin;
 423         static struct iovec iov = {
 424                 .iov_base = buf,
 425                 .iov_len = sizeof(buf)
 426         };
 427         static struct msghdr msg = {
 428                 .msg_name = &sin,
 429                 .msg_namelen = sizeof(sin),
 430                 .msg_iov = &iov,
 431                 .msg_iovlen = 1,
 432                 .msg_control = cmsg_buf,
 433                 .msg_controllen = sizeof(cmsg_buf),
 434         };
 435         struct cmsghdr *cmsg;
 436         char addr_str[INET6_ADDRSTRLEN];
 437         int len;
 438
 439         do {
 440                 struct in6_pktinfo *pkti = NULL;
 441                 struct interface *iface;
 442
 443                 len = recvmsg(u->fd, &msg, 0);
 444                 if (len < 0) {
 445                         switch (errno) {
 446                         case EAGAIN:
 447                                 return;
 448                         case EINTR:
 449                                 continue;
 450                         default:
 451                                 perror("recvmsg");
 452                                 uloop_fd_delete(u);
 453                                 return;
 454                         }
 455                 }
 456
 457                 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
 458                         if (cmsg->cmsg_type != IPV6_PKTINFO)
 459                                 continue;
 460
 461                         pkti = (struct in6_pktinfo *) CMSG_DATA(cmsg);
 462                 }
 463
 464                 if (!pkti) {
 465                         MSG(DEBUG, "Received packet without ifindex\n");
 466                         continue;
 467                 }
 468
 469                 iface = interface_find_by_ifindex(pkti->ipi6_ifindex);
 470                 if (!iface) {
 471                         MSG(DEBUG, "Received packet from unconfigured interface %d\n", pkti->ipi6_ifindex);
 472                         continue;
 473                 }
 474
 475                 inet_ntop(AF_INET6, &sin.sin6_addr, addr_str, sizeof(addr_str));
 476                 if (sin.sin6_addr.s6_addr[0] == 0) {
 477                         /* IPv4 mapped address. Ignore. */
 478                         continue;
 479                 }
 480
 481                 interface_recv_msg(iface, addr_str, buf, len);
 482         } while (1);
 483 }
 484
 485 static void interface_send_msg_v4(struct interface *iface, struct blob_attr *data)
 486 {
 487         static size_t cmsg_data[( CMSG_SPACE(sizeof(struct in_pktinfo)) / sizeof(size_t)) + 1];
 488         static struct sockaddr_in a;
 489         static struct iovec iov;
 490         static struct msghdr m = {
 491                 .msg_name = (struct sockaddr *) &a,
 492                 .msg_namelen = sizeof(a),
 493                 .msg_iov = &iov,
 494                 .msg_iovlen = 1,
 495                 .msg_control = cmsg_data,
 496                 .msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo)),
 497         };
 498         struct in_pktinfo *pkti;
 499         struct cmsghdr *cmsg;
 500
 501         a.sin_family = AF_INET;
 502         a.sin_port = htons(APMGR_PORT);
 503         a.sin_addr.s_addr = ~0;
 504
 505         memset(cmsg_data, 0, sizeof(cmsg_data));
 506         cmsg = CMSG_FIRSTHDR(&m);
 507         cmsg->cmsg_len = m.msg_controllen;
 508         cmsg->cmsg_level = IPPROTO_IP;
 509         cmsg->cmsg_type = IP_PKTINFO;
 510
 511         pkti = (struct in_pktinfo *) CMSG_DATA(cmsg);
 512         pkti->ipi_ifindex = iface->ifindex;
 513
 514         iov.iov_base = data;
 515         iov.iov_len = blob_pad_len(data);
 516
 517         if (sendmsg(remote_fd.fd, &m, 0) < 0)
 518                 perror("sendmsg");
 519 }
 520
 521
 522 static void interface_send_msg_v6(struct interface *iface, struct blob_attr *data) {
 523         static struct sockaddr_in6 groupSock = {};
 524
 525         groupSock.sin6_family = AF_INET6;
 526         inet_pton(AF_INET6, APMGR_V6_MCAST_GROUP, &groupSock.sin6_addr);
 527         groupSock.sin6_port = htons(APMGR_PORT);
 528
 529         setsockopt(remote_fd.fd, IPPROTO_IPV6, IPV6_MULTICAST_IF, &iface->ifindex, sizeof(iface->ifindex));
 530
 531         if (sendto(remote_fd.fd, data, blob_pad_len(data), 0, (const struct sockaddr *)&groupSock, sizeof(groupSock)) < 0)
 532                 perror("sendmsg");
 533 }
 534
 535 static void interface_send_msg(struct interface *iface, struct blob_attr *data){
 536         if (config.ipv6) {
 537                 interface_send_msg_v6(iface, data);
 538         } else {
 539                 interface_send_msg_v4(iface, data);
 540         }
 541 }
 542
 543 static void usteer_send_sta_info(struct sta_info *sta)
 544 {
 545         int seen = current_time - sta->seen;
 546         int last_connected = !!sta->connected ? 0 : current_time - sta->last_connected;
 547         void *c;
 548
 549         c = blob_nest_start(&buf, 0);
 550         blob_put(&buf, APMSG_STA_ADDR, sta->sta->addr, 6);
 551         blob_put_int8(&buf, APMSG_STA_CONNECTED, !!sta->connected);
 552         blob_put_int32(&buf, APMSG_STA_SIGNAL, sta->signal);
 553         blob_put_int32(&buf, APMSG_STA_SEEN, seen);
 554         blob_put_int32(&buf, APMSG_STA_LAST_CONNECTED, last_connected);
 555         blob_put_int32(&buf, APMSG_STA_TIMEOUT, config.local_sta_timeout - seen);
 556         blob_nest_end(&buf, c);
 557 }
 558
 559 static void usteer_send_node(struct usteer_node *node, struct sta_info *sta)
 560 {
 561         void *c, *s, *r;
 562
 563         c = blob_nest_start(&buf, 0);
 564
 565         blob_put_string(&buf, APMSG_NODE_NAME, usteer_node_name(node));
 566         blob_put_string(&buf, APMSG_NODE_SSID, node->ssid);
 567         blob_put_int32(&buf, APMSG_NODE_FREQ, node->freq);
 568         blob_put_int32(&buf, APMSG_NODE_NOISE, node->noise);
 569         blob_put_int32(&buf, APMSG_NODE_LOAD, node->load);
 570         blob_put_int32(&buf, APMSG_NODE_N_ASSOC, node->n_assoc);
 571         blob_put_int32(&buf, APMSG_NODE_MAX_ASSOC, node->max_assoc);
 572         blob_put_int32(&buf, APMSG_NODE_OP_CLASS, node->op_class);
 573         blob_put_int32(&buf, APMSG_NODE_CHANNEL, node->channel);
 574         blob_put(&buf, APMSG_NODE_BSSID, node->bssid, sizeof(node->bssid));
 575         if (node->rrm_nr) {
 576                 r = blob_nest_start(&buf, APMSG_NODE_RRM_NR);
 577                 blobmsg_add_field(&buf, BLOBMSG_TYPE_ARRAY, "",
 578                                   blobmsg_data(node->rrm_nr),
 579                                   blobmsg_data_len(node->rrm_nr));
 580                 blob_nest_end(&buf, r);
 581         }
 582
 583         if (node->node_info)
 584                 blob_put(&buf, APMSG_NODE_NODE_INFO,
 585                          blob_data(node->node_info),
 586                          blob_len(node->node_info));
 587
 588         s = blob_nest_start(&buf, APMSG_NODE_STATIONS);
 589
 590         if (sta) {
 591                 usteer_send_sta_info(sta);
 592         } else {
 593                 list_for_each_entry(sta, &node->sta_info, node_list)
 594                         usteer_send_sta_info(sta);
 595         }
 596
 597         blob_nest_end(&buf, s);
 598
 599         blob_nest_end(&buf, c);
 600 }
 601
 602 static void
 603 usteer_check_timeout(void)
 604 {
 605         struct usteer_remote_node *node, *tmp;
 606         int timeout = config.remote_node_timeout;
 607
 608         list_for_each_entry_safe(node, tmp, &remote_nodes, list) {
 609                 if (node->check++ > timeout)
 610                         remote_node_free(node);
 611         }
 612 }
 613
 614 static void *
 615 usteer_update_init(void)
 616 {
 617         blob_buf_init(&buf, 0);
 618         blob_put_int32(&buf, APMSG_ID, local_id);
 619         blob_put_int32(&buf, APMSG_SEQ, ++msg_seq);
 620         if (host_info_blob)
 621                 blob_put(&buf, APMSG_HOST_INFO,
 622                          blob_data(host_info_blob),
 623                          blob_len(host_info_blob));
 624
 625         return blob_nest_start(&buf, APMSG_NODES);
 626 }
 627
 628 static void
 629 usteer_update_send(void *c)
 630 {
 631         struct interface *iface;
 632
 633         blob_nest_end(&buf, c);
 634
 635         vlist_for_each_element(&interfaces, iface, node)
 636                 interface_send_msg(iface, buf.head);
 637 }
 638
 639 void
 640 usteer_send_sta_update(struct sta_info *si)
 641 {
 642         void *c = usteer_update_init();
 643         usteer_send_node(si->node, si);
 644         usteer_update_send(c);
 645 }
 646
 647 static void
 648 usteer_send_update_timer(struct uloop_timeout *t)
 649 {
 650         struct usteer_node *node;
 651         void *c;
 652
 653         usteer_update_time();
 654         uloop_timeout_set(t, config.remote_update_interval);
 655
 656         if (!avl_is_empty(&local_nodes) || host_info_blob) {
 657                 c = usteer_update_init();
 658                 for_each_local_node(node)
 659                         usteer_send_node(node, NULL);
 660
 661                 usteer_update_send(c);
 662         }
 663         usteer_check_timeout();
 664 }
 665
 666 static int
 667 usteer_init_local_id(void)
 668 {
 669         FILE *f;
 670
 671         f = fopen("/dev/urandom", "r");
 672         if (!f) {
 673                 perror("fopen(/dev/urandom)");
 674                 return -1;
 675         }
 676
 677         if (fread(&local_id, sizeof(local_id), 1, f) < 1)
 678                 return -1;
 679
 680         fclose(f);
 681         return 0;
 682 }
 683
 684 static int usteer_create_v4_socket() {
 685         int yes = 1;
 686         int fd;
 687
 688         fd = usock(USOCK_UDP | USOCK_SERVER | USOCK_NONBLOCK |
 689                    USOCK_NUMERIC | USOCK_IPV4ONLY,
 690                    "0.0.0.0", APMGR_PORT_STR);
 691         if (fd < 0) {
 692                 perror("usock");
 693                 return - 1;
 694         }
 695
 696         if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &yes, sizeof(yes)) < 0)
 697                 perror("setsockopt(IP_PKTINFO)");
 698
 699         if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &yes, sizeof(yes)) < 0)
 700                 perror("setsockopt(SO_BROADCAST)");
 701
 702         return fd;
 703 }
 704
 705
 706 static int usteer_create_v6_socket() {
 707         struct interface *iface;
 708         struct ipv6_mreq group;
 709         int yes = 1;
 710         int fd;
 711
 712         fd = usock(USOCK_UDP | USOCK_SERVER | USOCK_NONBLOCK |
 713                    USOCK_NUMERIC | USOCK_IPV6ONLY,
 714                    "::", APMGR_PORT_STR);
 715         if (fd < 0) {
 716                 perror("usock");
 717                 return fd;
 718         }
 719
 720         if (!inet_pton(AF_INET6, APMGR_V6_MCAST_GROUP, &group.ipv6mr_multiaddr.s6_addr))
 721                 perror("inet_pton(AF_INET6)");
 722
 723         /* Membership has to be added for every interface we listen on. */
 724         vlist_for_each_element(&interfaces, iface, node) {
 725                 group.ipv6mr_interface = iface->ifindex;
 726                 if(setsockopt(fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, (char *)&group, sizeof group) < 0)
 727                         perror("setsockopt(IPV6_ADD_MEMBERSHIP)");
 728         }
 729
 730         if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &yes, sizeof(yes)) < 0)
 731                 perror("setsockopt(IPV6_RECVPKTINFO)");
 732
 733         if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &yes, sizeof(yes)) < 0)
 734                 perror("setsockopt(SO_BROADCAST)");
 735
 736         return fd;
 737 }
 738
 739 static void usteer_reload_timer(struct uloop_timeout *t) {
 740         /* Remove uloop descriptor */
 741         if (remote_fd.fd && remote_fd.registered) {
 742                 uloop_fd_delete(&remote_fd);
 743                 close(remote_fd.fd);
 744         }
 745
 746         if (config.ipv6) {
 747                 remote_fd.fd = usteer_create_v6_socket();
 748                 remote_fd.cb = interface_recv_v6;
 749         } else {
 750                 remote_fd.fd = usteer_create_v4_socket();
 751                 remote_fd.cb = interface_recv_v4;
 752         }
 753
 754         if (remote_fd.fd < 0)
 755                 return;
 756
 757         uloop_fd_add(&remote_fd, ULOOP_READ);
 758 }
 759
 760 int usteer_interface_init(void)
 761 {
 762         if (usteer_init_local_id())
 763                 return -1;
 764
 765         remote_timer.cb = usteer_send_update_timer;
 766         remote_timer.cb(&remote_timer);
 767
 768         reload_timer.cb = usteer_reload_timer;
 769         reload_timer.cb(&reload_timer);
 770
 771         return 0;
 772 }