local_node.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 <net/ethernet.h>
  23 #ifdef linux
  24 #include <netinet/ether.h>
  25 #endif
  26 #include <net/if.h>
  27 #include <stdlib.h>
  28
  29 #include <libubox/avl-cmp.h>
  30 #include <libubox/blobmsg_json.h>
  31 #include "usteer.h"
  32 #include "node.h"
  33
  34 AVL_TREE(local_nodes, avl_strcmp, false, NULL);
  35 static struct blob_buf b;
  36 static char *node_up_script;
  37
  38 static void
  39 usteer_local_node_state_reset(struct usteer_local_node *ln)
  40 {
  41         if (ln->req_state == REQ_IDLE)
  42                 return;
  43
  44         ubus_abort_request(ubus_ctx, &ln->req);
  45         uloop_timeout_cancel(&ln->req_timer);
  46         ln->req_state = REQ_IDLE;
  47 }
  48
  49 static void
  50 usteer_local_node_pending_bss_tm_free(struct usteer_local_node *ln)
  51 {
  52         struct usteer_bss_tm_query *query, *tmp;
  53
  54         list_for_each_entry_safe(query, tmp, &ln->bss_tm_queries, list) {
  55                 list_del(&query->list);
  56                 free(query);
  57         }
  58 }
  59
  60 static void
  61 usteer_free_node(struct ubus_context *ctx, struct usteer_local_node *ln)
  62 {
  63         struct usteer_node_handler *h;
  64
  65         list_for_each_entry(h, &node_handlers, list) {
  66                 if (!h->free_node)
  67                         continue;
  68                 h->free_node(&ln->node);
  69         }
  70
  71         usteer_local_node_pending_bss_tm_free(ln);
  72         usteer_local_node_state_reset(ln);
  73         usteer_sta_node_cleanup(&ln->node);
  74         usteer_measurement_report_node_cleanup(&ln->node);
  75         uloop_timeout_cancel(&ln->update);
  76         uloop_timeout_cancel(&ln->bss_tm_queries_timeout);
  77         avl_delete(&local_nodes, &ln->node.avl);
  78         ubus_unregister_subscriber(ctx, &ln->ev);
  79         kvlist_free(&ln->node_info);
  80         free(ln);
  81 }
  82
  83 struct usteer_local_node *usteer_local_node_by_bssid(uint8_t *bssid) {
  84         struct usteer_local_node *ln;
  85         struct usteer_node *n;
  86
  87         for_each_local_node(n) {
  88                 ln = container_of(n, struct usteer_local_node, node);
  89                 if (!memcmp(n->bssid, bssid, 6))
  90                         return ln;
  91         }
  92
  93         return NULL;
  94 }
  95
  96 static void
  97 usteer_handle_remove(struct ubus_context *ctx, struct ubus_subscriber *s,
  98                     uint32_t id)
  99 {
 100         struct usteer_local_node *ln = container_of(s, struct usteer_local_node, ev);
 101
 102         usteer_free_node(ctx, ln);
 103 }
 104
 105 static int
 106 usteer_handle_bss_tm_query(struct usteer_local_node *ln, struct blob_attr *msg)
 107 {
 108         enum {
 109                 BSS_TM_QUERY_ADDRESS,
 110                 BSS_TM_QUERY_DIALOG_TOKEN,
 111                 BSS_TM_QUERY_CANDIDATE_LIST,
 112                 __BSS_TM_QUERY_MAX
 113         };
 114         struct blobmsg_policy policy[__BSS_TM_QUERY_MAX] = {
 115                 [BSS_TM_QUERY_ADDRESS] = { .name = "address", .type = BLOBMSG_TYPE_STRING },
 116                 [BSS_TM_QUERY_DIALOG_TOKEN] = { .name = "dialog-token", .type = BLOBMSG_TYPE_INT8 },
 117                 [BSS_TM_QUERY_CANDIDATE_LIST] = { .name = "candidate-list", .type = BLOBMSG_TYPE_STRING },
 118         };
 119         struct blob_attr *tb[__BSS_TM_QUERY_MAX];
 120         struct usteer_bss_tm_query *query;
 121         uint8_t *sta_addr;
 122
 123         blobmsg_parse(policy, __BSS_TM_QUERY_MAX, tb, blob_data(msg), blob_len(msg));
 124
 125         if (!tb[BSS_TM_QUERY_ADDRESS] || !tb[BSS_TM_QUERY_DIALOG_TOKEN])
 126                 return 0;
 127
 128         query = calloc(1, sizeof(*query));
 129         if (!query)
 130                 return 0;
 131
 132         query->dialog_token = blobmsg_get_u8(tb[BSS_TM_QUERY_DIALOG_TOKEN]);
 133
 134         sta_addr = (uint8_t *) ether_aton(blobmsg_get_string(tb[BSS_TM_QUERY_ADDRESS]));
 135         if (!sta_addr)
 136                 return 0;
 137
 138         memcpy(query->sta_addr, sta_addr, 6);
 139
 140         list_add(&query->list, &ln->bss_tm_queries);
 141         uloop_timeout_set(&ln->bss_tm_queries_timeout, 1);
 142
 143         return 1;
 144 }
 145
 146 static int
 147 usteer_handle_event(struct ubus_context *ctx, struct ubus_object *obj,
 148                    struct ubus_request_data *req, const char *method,
 149                    struct blob_attr *msg)
 150 {
 151         enum {
 152                 EVENT_ADDR,
 153                 EVENT_SIGNAL,
 154                 EVENT_TARGET,
 155                 EVENT_FREQ,
 156                 __EVENT_MAX
 157         };
 158         struct blobmsg_policy policy[__EVENT_MAX] = {
 159                 [EVENT_ADDR] = { .name = "address", .type = BLOBMSG_TYPE_STRING },
 160                 [EVENT_SIGNAL] = { .name = "signal", .type = BLOBMSG_TYPE_INT32 },
 161                 [EVENT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
 162                 [EVENT_FREQ] = { .name = "freq", .type = BLOBMSG_TYPE_INT32 },
 163         };
 164         enum usteer_event_type ev_type = __EVENT_TYPE_MAX;
 165         struct blob_attr *tb[__EVENT_MAX];
 166         struct usteer_local_node *ln;
 167         struct usteer_node *node;
 168         int signal = NO_SIGNAL;
 169         int freq = 0;
 170         const char *addr_str;
 171         const uint8_t *addr;
 172         int i;
 173         bool ret;
 174
 175         usteer_update_time();
 176
 177         ln = container_of(obj, struct usteer_local_node, ev.obj);
 178
 179         if(!strcmp(method, "bss-transition-query")) {
 180                 return usteer_handle_bss_tm_query(ln, msg);
 181         }
 182
 183         for (i = 0; i < ARRAY_SIZE(event_types); i++) {
 184                 if (strcmp(method, event_types[i]) != 0)
 185                         continue;
 186
 187                 ev_type = i;
 188                 break;
 189         }
 190
 191         ln = container_of(obj, struct usteer_local_node, ev.obj);
 192         node = &ln->node;
 193         blobmsg_parse(policy, __EVENT_MAX, tb, blob_data(msg), blob_len(msg));
 194         if (!tb[EVENT_ADDR] || !tb[EVENT_FREQ])
 195                 return UBUS_STATUS_INVALID_ARGUMENT;
 196
 197         if (tb[EVENT_SIGNAL])
 198                 signal = (int32_t) blobmsg_get_u32(tb[EVENT_SIGNAL]);
 199
 200         if (tb[EVENT_FREQ])
 201                 freq = blobmsg_get_u32(tb[EVENT_FREQ]);
 202
 203         addr_str = blobmsg_data(tb[EVENT_ADDR]);
 204         addr = (uint8_t *) ether_aton(addr_str);
 205         if (!addr)
 206                 return UBUS_STATUS_INVALID_ARGUMENT;
 207
 208         ret = usteer_handle_sta_event(node, addr, ev_type, freq, signal);
 209
 210         MSG(DEBUG, "received %s event from %s, signal=%d, freq=%d, handled:%s\n",
 211             method, addr_str, signal, freq, ret ? "true" : "false");
 212
 213         return ret ? 0 : 17 /* WLAN_STATUS_AP_UNABLE_TO_HANDLE_NEW_STA */;
 214 }
 215
 216 static void
 217 usteer_local_node_assoc_update(struct sta_info *si, struct blob_attr *data)
 218 {
 219         enum {
 220                 MSG_ASSOC,
 221                 __MSG_MAX,
 222         };
 223         static struct blobmsg_policy policy[__MSG_MAX] = {
 224                 [MSG_ASSOC] = { "assoc", BLOBMSG_TYPE_BOOL },
 225         };
 226         struct blob_attr *tb[__MSG_MAX];
 227         struct usteer_remote_node *rn;
 228         struct sta_info *remote_si;
 229
 230         blobmsg_parse(policy, __MSG_MAX, tb, blobmsg_data(data), blobmsg_data_len(data));
 231         if (tb[MSG_ASSOC] && blobmsg_get_u8(tb[MSG_ASSOC])) {
 232                 if (si->connected == STA_NOT_CONNECTED) {
 233                         /* New connection. Check if STA roamed. */
 234                         for_each_remote_node(rn) {
 235                                 remote_si = usteer_sta_info_get(si->sta, &rn->node, NULL);
 236                                 if (!remote_si)
 237                                         continue;
 238
 239                                 if (current_time - remote_si->last_connected < config.roam_process_timeout) {
 240                                         rn->node.roam_events.source++;
 241                                         /* Don't abort looking for roam sources here.
 242                                          * The client might have roamed via another node
 243                                          * within the roam-timeout.
 244                                          */
 245                                 }
 246                         }
 247                 }
 248                 si->connected = STA_CONNECTED;
 249         }
 250 }
 251
 252 static void
 253 usteer_local_node_update_sta_rrm(const uint8_t *addr, struct blob_attr *client_attr)
 254 {
 255         static const struct blobmsg_policy rrm_policy = {
 256                 .name = "rrm",
 257                 .type = BLOBMSG_TYPE_ARRAY,
 258         };
 259         struct blob_attr *sta_blob = NULL;
 260         struct sta *sta;
 261
 262         if (!addr)
 263                 return;
 264
 265         /* Don't create the STA */
 266         sta = usteer_sta_get(addr, false);
 267         if (!sta)
 268                 return;
 269
 270         blobmsg_parse(&rrm_policy, 1, &sta_blob, blobmsg_data(client_attr), blobmsg_data_len(client_attr));
 271         if (!sta_blob)
 272                 return;
 273
 274         sta->rrm = blobmsg_get_u32(blobmsg_data(sta_blob));
 275 }
 276
 277 static void
 278 usteer_local_node_set_assoc(struct usteer_local_node *ln, struct blob_attr *cl)
 279 {
 280         struct usteer_node *node = &ln->node;
 281         struct usteer_node_handler *h;
 282         struct blob_attr *cur;
 283         struct sta_info *si;
 284         struct sta *sta;
 285         int n_assoc = 0;
 286         int rem;
 287
 288         usteer_update_time();
 289
 290         list_for_each_entry(si, &node->sta_info, node_list) {
 291                 if (si->connected)
 292                         si->connected = STA_DISCONNECTED;
 293         }
 294
 295         blobmsg_for_each_attr(cur, cl, rem) {
 296                 uint8_t *addr = (uint8_t *) ether_aton(blobmsg_name(cur));
 297                 bool create;
 298
 299                 if (!addr)
 300                         continue;
 301
 302                 sta = usteer_sta_get(addr, true);
 303                 si = usteer_sta_info_get(sta, node, &create);
 304                 list_for_each_entry(h, &node_handlers, list) {
 305                         if (!h->update_sta)
 306                                 continue;
 307
 308                         h->update_sta(node, si);
 309                 }
 310                 usteer_local_node_assoc_update(si, cur);
 311                 if (si->connected == STA_CONNECTED) {
 312                         si->last_connected = current_time;
 313                         n_assoc++;
 314                 }
 315
 316                 /* Read RRM information */
 317                 usteer_local_node_update_sta_rrm(addr, cur);
 318         }
 319
 320         node->n_assoc = n_assoc;
 321
 322         list_for_each_entry(si, &node->sta_info, node_list) {
 323                 if (si->connected != STA_DISCONNECTED)
 324                         continue;
 325
 326                 usteer_sta_disconnected(si);
 327                 MSG(VERBOSE, "station "MAC_ADDR_FMT" disconnected from node %s\n",
 328                         MAC_ADDR_DATA(si->sta->addr), usteer_node_name(node));
 329         }
 330 }
 331
 332 static void
 333 usteer_local_node_list_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 334 {
 335         enum {
 336                 MSG_FREQ,
 337                 MSG_CLIENTS,
 338                 __MSG_MAX,
 339         };
 340         static struct blobmsg_policy policy[__MSG_MAX] = {
 341                 [MSG_FREQ] = { "freq", BLOBMSG_TYPE_INT32 },
 342                 [MSG_CLIENTS] = { "clients", BLOBMSG_TYPE_TABLE },
 343         };
 344         struct blob_attr *tb[__MSG_MAX];
 345         struct usteer_local_node *ln;
 346         struct usteer_node *node;
 347
 348         ln = container_of(req, struct usteer_local_node, req);
 349         node = &ln->node;
 350
 351         blobmsg_parse(policy, __MSG_MAX, tb, blob_data(msg), blob_len(msg));
 352         if (!tb[MSG_FREQ] || !tb[MSG_CLIENTS])
 353                 return;
 354
 355         node->freq = blobmsg_get_u32(tb[MSG_FREQ]);
 356         usteer_local_node_set_assoc(ln, tb[MSG_CLIENTS]);
 357 }
 358
 359 static void
 360 usteer_local_node_status_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 361 {
 362         enum {
 363                 MSG_FREQ,
 364                 MSG_CHANNEL,
 365                 MSG_OP_CLASS,
 366                 __MSG_MAX,
 367         };
 368         static struct blobmsg_policy policy[__MSG_MAX] = {
 369                 [MSG_FREQ] = { "freq", BLOBMSG_TYPE_INT32 },
 370                 [MSG_CHANNEL] = { "channel", BLOBMSG_TYPE_INT32 },
 371                 [MSG_OP_CLASS] = { "op_class", BLOBMSG_TYPE_INT32 },
 372         };
 373         struct blob_attr *tb[__MSG_MAX];
 374         struct usteer_local_node *ln;
 375         struct usteer_node *node;
 376
 377         ln = container_of(req, struct usteer_local_node, req);
 378         node = &ln->node;
 379
 380         blobmsg_parse(policy, __MSG_MAX, tb, blob_data(msg), blob_len(msg));
 381         if (tb[MSG_FREQ])
 382                 node->freq = blobmsg_get_u32(tb[MSG_FREQ]);
 383         if (tb[MSG_CHANNEL])
 384                 node->channel = blobmsg_get_u32(tb[MSG_CHANNEL]);
 385         if (tb[MSG_FREQ])
 386                 node->op_class = blobmsg_get_u32(tb[MSG_OP_CLASS]);
 387 }
 388
 389 static void
 390 usteer_local_node_rrm_nr_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 391 {
 392         static const struct blobmsg_policy policy = {
 393                 "value", BLOBMSG_TYPE_ARRAY
 394         };
 395         struct usteer_local_node *ln;
 396         struct blob_attr *tb;
 397
 398         ln = container_of(req, struct usteer_local_node, req);
 399
 400         blobmsg_parse(&policy, 1, &tb, blob_data(msg), blob_len(msg));
 401         if (!tb)
 402                 return;
 403
 404         usteer_node_set_blob(&ln->node.rrm_nr, tb);
 405 }
 406
 407 static void
 408 usteer_local_node_req_cb(struct ubus_request *req, int ret)
 409 {
 410         struct usteer_local_node *ln;
 411
 412         ln = container_of(req, struct usteer_local_node, req);
 413         uloop_timeout_set(&ln->req_timer, 1);
 414 }
 415
 416 static bool
 417 usteer_add_rrm_data(struct usteer_local_node *ln, struct usteer_node *node)
 418 {
 419         if (node == &ln->node)
 420                 return false;
 421
 422         if (!node->rrm_nr)
 423                 return false;
 424
 425         /* Remote node only adds same SSID. Required for local-node. */
 426         if (strcmp(ln->node.ssid, node->ssid) != 0)
 427                 return false;
 428
 429         blobmsg_add_field(&b, BLOBMSG_TYPE_ARRAY, "",
 430                           blobmsg_data(node->rrm_nr),
 431                           blobmsg_data_len(node->rrm_nr));
 432
 433         return true;
 434 }
 435
 436 static void
 437 usteer_local_node_prepare_rrm_set(struct usteer_local_node *ln)
 438 {
 439         struct usteer_node *node, *last_remote_neighbor = NULL;
 440         int i = 0;
 441         void *c;
 442
 443         c = blobmsg_open_array(&b, "list");
 444         for_each_local_node(node) {
 445                 if (i >= config.max_neighbor_reports)
 446                         break;
 447                 if (usteer_add_rrm_data(ln, node))
 448                         i++;
 449         }
 450
 451         while (i < config.max_neighbor_reports) {
 452                 node = usteer_node_get_next_neighbor(&ln->node, last_remote_neighbor);
 453                 if (!node) {
 454                         /* No more nodes available */
 455                         break;
 456                 }
 457
 458                 last_remote_neighbor = node;
 459                 if (usteer_add_rrm_data(ln, node))
 460                         i++;
 461         }
 462
 463         blobmsg_close_array(&b, c);
 464 }
 465
 466 static void
 467 usteer_local_node_state_next(struct uloop_timeout *timeout)
 468 {
 469         struct usteer_local_node *ln;
 470
 471         ln = container_of(timeout, struct usteer_local_node, req_timer);
 472
 473         ln->req_state++;
 474         if (ln->req_state >= __REQ_MAX) {
 475                 ln->req_state = REQ_IDLE;
 476                 return;
 477         }
 478
 479         blob_buf_init(&b, 0);
 480         switch (ln->req_state) {
 481         case REQ_CLIENTS:
 482                 ubus_invoke_async(ubus_ctx, ln->obj_id, "get_clients", b.head, &ln->req);
 483                 ln->req.data_cb = usteer_local_node_list_cb;
 484                 break;
 485         case REQ_STATUS:
 486                 ubus_invoke_async(ubus_ctx, ln->obj_id, "get_status", b.head, &ln->req);
 487                 ln->req.data_cb = usteer_local_node_status_cb;
 488                 break;
 489         case REQ_RRM_SET_LIST:
 490                 usteer_local_node_prepare_rrm_set(ln);
 491                 ubus_invoke_async(ubus_ctx, ln->obj_id, "rrm_nr_set", b.head, &ln->req);
 492                 ln->req.data_cb = NULL;
 493                 break;
 494         case REQ_RRM_GET_OWN:
 495                 ubus_invoke_async(ubus_ctx, ln->obj_id, "rrm_nr_get_own", b.head, &ln->req);
 496                 ln->req.data_cb = usteer_local_node_rrm_nr_cb;
 497                 break;
 498         default:
 499                 break;
 500         }
 501         ln->req.complete_cb = usteer_local_node_req_cb;
 502         ubus_complete_request_async(ubus_ctx, &ln->req);
 503 }
 504
 505 static void
 506 usteer_local_node_update(struct uloop_timeout *timeout)
 507 {
 508         struct usteer_local_node *ln;
 509         struct usteer_node_handler *h;
 510         struct usteer_node *node;
 511
 512         ln = container_of(timeout, struct usteer_local_node, update);
 513         node = &ln->node;
 514
 515         list_for_each_entry(h, &node_handlers, list) {
 516                 if (!h->update_node)
 517                         continue;
 518
 519                 h->update_node(node);
 520         }
 521
 522         usteer_local_node_state_reset(ln);
 523         uloop_timeout_set(&ln->req_timer, 1);
 524         usteer_local_node_kick(ln);
 525         uloop_timeout_set(timeout, config.local_sta_update);
 526 }
 527
 528 static void
 529 usteer_local_node_process_bss_tm_queries(struct uloop_timeout *timeout)
 530 {
 531         struct usteer_bss_tm_query *query, *tmp;
 532         struct usteer_local_node *ln;
 533         struct usteer_node *node;
 534         struct sta_info *si;
 535         struct sta *sta;
 536
 537         uint8_t validity_period = 100; /* ~ 10 seconds */
 538
 539         ln = container_of(timeout, struct usteer_local_node, bss_tm_queries_timeout);
 540         node = &ln->node;
 541
 542         list_for_each_entry_safe(query, tmp, &ln->bss_tm_queries, list) {
 543                 sta = usteer_sta_get(query->sta_addr, false);
 544                 if (!sta)
 545                         continue;
 546
 547                 si = usteer_sta_info_get(sta, node, false);
 548                 if (!si)
 549                         continue;
 550
 551                 usteer_ubus_bss_transition_request(si, query->dialog_token, false, false, validity_period);
 552         }
 553
 554         /* Free pending queries we can not handle */
 555         usteer_local_node_pending_bss_tm_free(ln);
 556 }
 557
 558 static struct usteer_local_node *
 559 usteer_get_node(struct ubus_context *ctx, const char *name)
 560 {
 561         struct usteer_local_node *ln;
 562         struct usteer_node *node;
 563         char *str;
 564
 565         ln = avl_find_element(&local_nodes, name, ln, node.avl);
 566         if (ln)
 567                 return ln;
 568
 569         ln = calloc_a(sizeof(*ln), &str, strlen(name) + 1);
 570         node = &ln->node;
 571         node->type = NODE_TYPE_LOCAL;
 572         node->created = current_time;
 573         node->avl.key = strcpy(str, name);
 574         ln->ev.remove_cb = usteer_handle_remove;
 575         ln->ev.cb = usteer_handle_event;
 576         ln->update.cb = usteer_local_node_update;
 577         ln->req_timer.cb = usteer_local_node_state_next;
 578         ubus_register_subscriber(ctx, &ln->ev);
 579         avl_insert(&local_nodes, &node->avl);
 580         kvlist_init(&ln->node_info, kvlist_blob_len);
 581         INIT_LIST_HEAD(&node->sta_info);
 582         INIT_LIST_HEAD(&node->measurements);
 583
 584         ln->bss_tm_queries_timeout.cb = usteer_local_node_process_bss_tm_queries;
 585         INIT_LIST_HEAD(&ln->bss_tm_queries);
 586         return ln;
 587 }
 588
 589 static void
 590 usteer_node_run_update_script(struct usteer_node *node)
 591 {
 592         struct usteer_local_node *ln = container_of(node, struct usteer_local_node, node);
 593         char *val;
 594
 595         if (!node_up_script)
 596                 return;
 597
 598         val = alloca(strlen(node_up_script) + strlen(ln->iface) + 8);
 599         sprintf(val, "%s '%s'", node_up_script, ln->iface);
 600         if (system(val))
 601                 MSG(INFO, "failed to execute %s\n", val);
 602 }
 603
 604 static void
 605 usteer_check_node_enabled(struct usteer_local_node *ln)
 606 {
 607         bool ssid_disabled = config.ssid_list;
 608         struct blob_attr *cur;
 609         int rem;
 610
 611         blobmsg_for_each_attr(cur, config.ssid_list, rem) {
 612                 if (strcmp(blobmsg_get_string(cur), ln->node.ssid) != 0)
 613                         continue;
 614
 615                 ssid_disabled = false;
 616                 break;
 617         }
 618
 619         if (ln->node.disabled == ssid_disabled)
 620                 return;
 621
 622         ln->node.disabled = ssid_disabled;
 623
 624         if (ssid_disabled) {
 625                 MSG(INFO, "Disconnecting from local node %s\n", usteer_node_name(&ln->node));
 626                 usteer_local_node_state_reset(ln);
 627                 usteer_sta_node_cleanup(&ln->node);
 628                 usteer_measurement_report_node_cleanup(&ln->node);
 629                 uloop_timeout_cancel(&ln->update);
 630                 ubus_unsubscribe(ubus_ctx, &ln->ev, ln->obj_id);
 631                 return;
 632         }
 633
 634         MSG(INFO, "Connecting to local node %s\n", usteer_node_name(&ln->node));
 635         ubus_subscribe(ubus_ctx, &ln->ev, ln->obj_id);
 636         uloop_timeout_set(&ln->update, 1);
 637         usteer_node_run_update_script(&ln->node);
 638 }
 639
 640 static void
 641 usteer_register_node(struct ubus_context *ctx, const char *name, uint32_t id)
 642 {
 643         struct usteer_local_node *ln;
 644         struct usteer_node_handler *h;
 645         const char *iface;
 646         int offset = sizeof("hostapd.") - 1;
 647
 648         iface = name + offset;
 649         if (strncmp(name, "hostapd.", iface - name) != 0)
 650                 return;
 651
 652         MSG(INFO, "Creating local node %s\n", name);
 653         ln = usteer_get_node(ctx, name);
 654         ln->obj_id = id;
 655         ln->iface = usteer_node_name(&ln->node) + offset;
 656         ln->ifindex = if_nametoindex(ln->iface);
 657
 658         blob_buf_init(&b, 0);
 659         blobmsg_add_u32(&b, "notify_response", 1);
 660         ubus_invoke(ctx, id, "notify_response", b.head, NULL, NULL, 1000);
 661
 662         blob_buf_init(&b, 0);
 663         blobmsg_add_u8(&b, "neighbor_report", 1);
 664         blobmsg_add_u8(&b, "beacon_report", 1);
 665         blobmsg_add_u8(&b, "bss_transition", 1);
 666         ubus_invoke(ctx, id, "bss_mgmt_enable", b.head, NULL, NULL, 1000);
 667
 668         list_for_each_entry(h, &node_handlers, list) {
 669                 if (!h->init_node)
 670                         continue;
 671
 672                 h->init_node(&ln->node);
 673         }
 674
 675         ln->node.disabled = true;
 676         usteer_check_node_enabled(ln);
 677 }
 678
 679 static void
 680 usteer_event_handler(struct ubus_context *ctx, struct ubus_event_handler *ev,
 681                     const char *type, struct blob_attr *msg)
 682 {
 683         static const struct blobmsg_policy policy[2] = {
 684                 { .name = "id", .type = BLOBMSG_TYPE_INT32 },
 685                 { .name = "path", .type = BLOBMSG_TYPE_STRING },
 686         };
 687         struct blob_attr *tb[2];
 688         const char *path;
 689
 690         blobmsg_parse(policy, 2, tb, blob_data(msg), blob_len(msg));
 691
 692         if (!tb[0] || !tb[1])
 693                 return;
 694
 695         path = blobmsg_data(tb[1]);
 696         usteer_register_node(ctx, path, blobmsg_get_u32(tb[0]));
 697 }
 698
 699 static void
 700 usteer_register_events(struct ubus_context *ctx)
 701 {
 702         static struct ubus_event_handler handler = {
 703             .cb = usteer_event_handler
 704         };
 705
 706         ubus_register_event_handler(ctx, &handler, "ubus.object.add");
 707 }
 708
 709 static void
 710 node_list_cb(struct ubus_context *ctx, struct ubus_object_data *obj, void *priv)
 711 {
 712         usteer_register_node(ctx, obj->path, obj->id);
 713 }
 714
 715 void config_set_node_up_script(struct blob_attr *data)
 716 {
 717         const char *val;
 718         struct usteer_node *node;
 719
 720         if (!data)
 721                 return;
 722
 723         val = blobmsg_get_string(data);
 724         if (node_up_script && !strcmp(val, node_up_script))
 725                 return;
 726
 727         free(node_up_script);
 728
 729         if (!strlen(val)) {
 730                 node_up_script = NULL;
 731                 return;
 732         }
 733
 734         node_up_script = strdup(val);
 735
 736         for_each_local_node(node)
 737                 usteer_node_run_update_script(node);
 738 }
 739
 740 void config_get_node_up_script(struct blob_buf *buf)
 741 {
 742         if (!node_up_script)
 743                 return;
 744
 745         blobmsg_add_string(buf, "node_up_script", node_up_script);
 746 }
 747
 748 void config_set_ssid_list(struct blob_attr *data)
 749 {
 750         struct usteer_local_node *ln;
 751
 752         free(config.ssid_list);
 753
 754         if (data && blobmsg_len(data))
 755                 config.ssid_list = blob_memdup(data);
 756         else
 757                 config.ssid_list = NULL;
 758
 759         avl_for_each_element(&local_nodes, ln, node.avl)
 760                 usteer_check_node_enabled(ln);
 761 }
 762
 763 void config_get_ssid_list(struct blob_buf *buf)
 764 {
 765         if (config.ssid_list)
 766                 blobmsg_add_blob(buf, config.ssid_list);
 767 }
 768
 769 void
 770 usteer_local_nodes_init(struct ubus_context *ctx)
 771 {
 772         usteer_register_events(ctx);
 773         ubus_lookup(ctx, "hostapd.*", node_list_cb, NULL);
 774 }