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