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_bss_tm_response(struct usteer_local_node *ln, struct blob_attr *msg)
 148 {
 149         enum {
 150                 BSS_TM_RESPONSE_ADDRESS,
 151                 BSS_TM_RESPONSE_STATUS_CODE,
 152                 __BSS_TM_RESPONSE_MAX
 153         };
 154         struct blobmsg_policy policy[__BSS_TM_RESPONSE_MAX] = {
 155                 [BSS_TM_RESPONSE_ADDRESS] = { .name = "address", .type = BLOBMSG_TYPE_STRING },
 156                 [BSS_TM_RESPONSE_STATUS_CODE] = { .name = "status-code", .type = BLOBMSG_TYPE_INT8 },
 157         };
 158         struct blob_attr *tb[__BSS_TM_RESPONSE_MAX];
 159         struct sta_info *si;
 160         struct sta *sta;
 161         uint8_t *sta_addr;
 162
 163         blobmsg_parse(policy, __BSS_TM_RESPONSE_MAX, tb, blob_data(msg), blob_len(msg));
 164
 165         if (!tb[BSS_TM_RESPONSE_ADDRESS] || !tb[BSS_TM_RESPONSE_STATUS_CODE])
 166                 return 0;
 167
 168         sta_addr = (uint8_t *) ether_aton(blobmsg_get_string(tb[BSS_TM_RESPONSE_ADDRESS]));
 169         if (!sta_addr)
 170                 return 0;
 171
 172         sta = usteer_sta_get(sta_addr, false);
 173         if (!sta)
 174                 return 0;
 175
 176         si = usteer_sta_info_get(sta, &ln->node, false);
 177         if (!si)
 178                 return 0;
 179
 180         si->bss_transition_response.status_code = blobmsg_get_u8(tb[BSS_TM_RESPONSE_STATUS_CODE]);
 181         si->bss_transition_response.timestamp = current_time;
 182
 183         if (si->bss_transition_response.status_code) {
 184                 /* Cancel imminent kick in case BSS transition was rejected */
 185                 si->kick_time = 0;
 186         }
 187
 188         return 0;
 189 }
 190
 191 static int
 192 usteer_local_node_handle_beacon_report(struct usteer_local_node *ln, struct blob_attr *msg)
 193 {
 194         enum {
 195                 BR_ADDRESS,
 196                 BR_BSSID,
 197                 BR_RCPI,
 198                 BR_RSNI,
 199                 __BR_MAX
 200         };
 201         struct blobmsg_policy policy[__BR_MAX] = {
 202                 [BR_ADDRESS] = { .name = "address", .type = BLOBMSG_TYPE_STRING },
 203                 [BR_BSSID] = { .name = "bssid", .type = BLOBMSG_TYPE_STRING },
 204                 [BR_RCPI] = { .name = "rcpi", .type = BLOBMSG_TYPE_INT16 },
 205                 [BR_RSNI] = { .name = "rsni", .type = BLOBMSG_TYPE_INT16 },
 206         };
 207         struct blob_attr *tb[__BR_MAX];
 208         struct usteer_node *node;
 209         uint8_t *addr;
 210         struct sta *sta;
 211
 212         blobmsg_parse(policy, __BR_MAX, tb, blob_data(msg), blob_len(msg));
 213         if (!tb[BR_ADDRESS] || !tb[BR_BSSID] || !tb[BR_RCPI] || !tb[BR_RSNI])
 214                 return 0;
 215
 216         addr = (uint8_t *) ether_aton(blobmsg_get_string(tb[BR_ADDRESS]));
 217         if (!addr)
 218                 return 0;
 219
 220         sta = usteer_sta_get(addr, false);
 221         if (!sta)
 222                 return 0;
 223
 224         addr = (uint8_t *) ether_aton(blobmsg_get_string(tb[BR_BSSID]));
 225         if (!addr)
 226                 return 0;
 227
 228         node = usteer_node_by_bssid(addr);
 229         if (!node)
 230                 return 0;
 231
 232         usteer_measurement_report_add(sta, node,
 233                                       (uint8_t)blobmsg_get_u16(tb[BR_RCPI]),
 234                                       (uint8_t)blobmsg_get_u16(tb[BR_RSNI]),
 235                                       current_time);
 236         return 0;
 237 }
 238
 239 static int
 240 usteer_handle_event(struct ubus_context *ctx, struct ubus_object *obj,
 241                    struct ubus_request_data *req, const char *method,
 242                    struct blob_attr *msg)
 243 {
 244         enum {
 245                 EVENT_ADDR,
 246                 EVENT_SIGNAL,
 247                 EVENT_TARGET,
 248                 EVENT_FREQ,
 249                 __EVENT_MAX
 250         };
 251         struct blobmsg_policy policy[__EVENT_MAX] = {
 252                 [EVENT_ADDR] = { .name = "address", .type = BLOBMSG_TYPE_STRING },
 253                 [EVENT_SIGNAL] = { .name = "signal", .type = BLOBMSG_TYPE_INT32 },
 254                 [EVENT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
 255                 [EVENT_FREQ] = { .name = "freq", .type = BLOBMSG_TYPE_INT32 },
 256         };
 257         enum usteer_event_type ev_type = __EVENT_TYPE_MAX;
 258         struct blob_attr *tb[__EVENT_MAX];
 259         struct usteer_local_node *ln;
 260         struct usteer_node *node;
 261         int signal = NO_SIGNAL;
 262         int freq = 0;
 263         const char *addr_str;
 264         const uint8_t *addr;
 265         int i;
 266         bool ret;
 267
 268         usteer_update_time();
 269
 270         ln = container_of(obj, struct usteer_local_node, ev.obj);
 271
 272         if(!strcmp(method, "bss-transition-query")) {
 273                 return usteer_handle_bss_tm_query(ln, msg);
 274         } else if(!strcmp(method, "bss-transition-response")) {
 275                 return usteer_handle_bss_tm_response(ln, msg);
 276         } else if(!strcmp(method, "beacon-report")) {
 277                 return usteer_local_node_handle_beacon_report(ln, msg);
 278         }
 279
 280         for (i = 0; i < ARRAY_SIZE(event_types); i++) {
 281                 if (strcmp(method, event_types[i]) != 0)
 282                         continue;
 283
 284                 ev_type = i;
 285                 break;
 286         }
 287
 288         ln = container_of(obj, struct usteer_local_node, ev.obj);
 289         node = &ln->node;
 290         blobmsg_parse(policy, __EVENT_MAX, tb, blob_data(msg), blob_len(msg));
 291         if (!tb[EVENT_ADDR] || !tb[EVENT_FREQ])
 292                 return UBUS_STATUS_INVALID_ARGUMENT;
 293
 294         if (tb[EVENT_SIGNAL])
 295                 signal = (int32_t) blobmsg_get_u32(tb[EVENT_SIGNAL]);
 296
 297         if (tb[EVENT_FREQ])
 298                 freq = blobmsg_get_u32(tb[EVENT_FREQ]);
 299
 300         addr_str = blobmsg_data(tb[EVENT_ADDR]);
 301         addr = (uint8_t *) ether_aton(addr_str);
 302         if (!addr)
 303                 return UBUS_STATUS_INVALID_ARGUMENT;
 304
 305         ret = usteer_handle_sta_event(node, addr, ev_type, freq, signal);
 306
 307         MSG(DEBUG, "received %s event from %s, signal=%d, freq=%d, handled:%s\n",
 308             method, addr_str, signal, freq, ret ? "true" : "false");
 309
 310         return ret ? 0 : 17 /* WLAN_STATUS_AP_UNABLE_TO_HANDLE_NEW_STA */;
 311 }
 312
 313 static void
 314 usteer_local_node_assoc_update(struct sta_info *si, struct blob_attr *data)
 315 {
 316         enum {
 317                 MSG_ASSOC,
 318                 __MSG_MAX,
 319         };
 320         static struct blobmsg_policy policy[__MSG_MAX] = {
 321                 [MSG_ASSOC] = { "assoc", BLOBMSG_TYPE_BOOL },
 322         };
 323         struct blob_attr *tb[__MSG_MAX];
 324         struct usteer_remote_node *rn;
 325         struct sta_info *remote_si;
 326
 327         blobmsg_parse(policy, __MSG_MAX, tb, blobmsg_data(data), blobmsg_data_len(data));
 328         if (tb[MSG_ASSOC] && blobmsg_get_u8(tb[MSG_ASSOC])) {
 329                 if (si->connected == STA_NOT_CONNECTED) {
 330                         /* New connection. Check if STA roamed. */
 331                         for_each_remote_node(rn) {
 332                                 remote_si = usteer_sta_info_get(si->sta, &rn->node, NULL);
 333                                 if (!remote_si)
 334                                         continue;
 335
 336                                 if (current_time - remote_si->last_connected < config.roam_process_timeout) {
 337                                         rn->node.roam_events.source++;
 338                                         /* Don't abort looking for roam sources here.
 339                                          * The client might have roamed via another node
 340                                          * within the roam-timeout.
 341                                          */
 342                                 }
 343                         }
 344                 }
 345                 si->connected = STA_CONNECTED;
 346         }
 347 }
 348
 349 static void
 350 usteer_local_node_update_sta_rrm_wnm(struct sta_info *si, struct blob_attr *client_attr)
 351 {
 352         static const struct blobmsg_policy rrm_policy = {
 353                 .name = "rrm",
 354                 .type = BLOBMSG_TYPE_ARRAY,
 355         };
 356         static const struct blobmsg_policy ext_capa_policy = {
 357                 .name = "extended_capabilities",
 358                 .type = BLOBMSG_TYPE_ARRAY,
 359         };
 360         struct blob_attr *rrm_blob = NULL, *wnm_blob = NULL, *cur;
 361         int rem;
 362         int i = 0;
 363
 364         /* RRM */
 365         blobmsg_parse(&rrm_policy, 1, &rrm_blob, blobmsg_data(client_attr), blobmsg_data_len(client_attr));
 366         if (!rrm_blob)
 367                 return;
 368
 369         si->rrm = blobmsg_get_u32(blobmsg_data(rrm_blob));
 370
 371         /* Extended Capabilities / WNM */
 372         blobmsg_parse(&ext_capa_policy, 1, &wnm_blob, blobmsg_data(client_attr), blobmsg_data_len(client_attr));
 373         if (!wnm_blob)
 374                 return;
 375
 376         blobmsg_for_each_attr(cur, wnm_blob, rem) {
 377                 if (blobmsg_type(cur) != BLOBMSG_TYPE_INT32)
 378                         return;
 379
 380                 if (i == 2) {
 381                         if (blobmsg_get_u32(cur) & (1 << 3))
 382                                 si->bss_transition = true;
 383                 }
 384
 385                 i++;
 386         }
 387 }
 388
 389 static void
 390 usteer_local_node_set_assoc(struct usteer_local_node *ln, struct blob_attr *cl)
 391 {
 392         struct usteer_node *node = &ln->node;
 393         struct usteer_node_handler *h;
 394         struct blob_attr *cur;
 395         struct sta_info *si;
 396         struct sta *sta;
 397         int n_assoc = 0;
 398         int rem;
 399
 400         usteer_update_time();
 401
 402         list_for_each_entry(si, &node->sta_info, node_list) {
 403                 if (si->connected)
 404                         si->connected = STA_DISCONNECTED;
 405         }
 406
 407         blobmsg_for_each_attr(cur, cl, rem) {
 408                 uint8_t *addr = (uint8_t *) ether_aton(blobmsg_name(cur));
 409                 bool create;
 410
 411                 if (!addr)
 412                         continue;
 413
 414                 sta = usteer_sta_get(addr, true);
 415                 si = usteer_sta_info_get(sta, node, &create);
 416                 list_for_each_entry(h, &node_handlers, list) {
 417                         if (!h->update_sta)
 418                                 continue;
 419
 420                         h->update_sta(node, si);
 421                 }
 422                 usteer_local_node_assoc_update(si, cur);
 423                 if (si->connected == STA_CONNECTED) {
 424                         si->last_connected = current_time;
 425                         n_assoc++;
 426                 }
 427
 428                 /* Read RRM information */
 429                 usteer_local_node_update_sta_rrm_wnm(si, cur);
 430         }
 431
 432         node->n_assoc = n_assoc;
 433
 434         list_for_each_entry(si, &node->sta_info, node_list) {
 435                 if (si->connected != STA_DISCONNECTED)
 436                         continue;
 437
 438                 usteer_sta_disconnected(si);
 439                 MSG(VERBOSE, "station "MAC_ADDR_FMT" disconnected from node %s\n",
 440                         MAC_ADDR_DATA(si->sta->addr), usteer_node_name(node));
 441         }
 442 }
 443
 444 static void
 445 usteer_local_node_list_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 446 {
 447         enum {
 448                 MSG_FREQ,
 449                 MSG_CLIENTS,
 450                 __MSG_MAX,
 451         };
 452         static struct blobmsg_policy policy[__MSG_MAX] = {
 453                 [MSG_FREQ] = { "freq", BLOBMSG_TYPE_INT32 },
 454                 [MSG_CLIENTS] = { "clients", BLOBMSG_TYPE_TABLE },
 455         };
 456         struct blob_attr *tb[__MSG_MAX];
 457         struct usteer_local_node *ln;
 458         struct usteer_node *node;
 459
 460         ln = container_of(req, struct usteer_local_node, req);
 461         node = &ln->node;
 462
 463         blobmsg_parse(policy, __MSG_MAX, tb, blob_data(msg), blob_len(msg));
 464         if (!tb[MSG_FREQ] || !tb[MSG_CLIENTS])
 465                 return;
 466
 467         node->freq = blobmsg_get_u32(tb[MSG_FREQ]);
 468         usteer_local_node_set_assoc(ln, tb[MSG_CLIENTS]);
 469 }
 470
 471 static void
 472 usteer_local_node_status_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 473 {
 474         enum {
 475                 MSG_FREQ,
 476                 MSG_CHANNEL,
 477                 MSG_OP_CLASS,
 478                 MSG_BEACON_INTERVAL,
 479                 __MSG_MAX,
 480         };
 481         static struct blobmsg_policy policy[__MSG_MAX] = {
 482                 [MSG_FREQ] = { "freq", BLOBMSG_TYPE_INT32 },
 483                 [MSG_CHANNEL] = { "channel", BLOBMSG_TYPE_INT32 },
 484                 [MSG_OP_CLASS] = { "op_class", BLOBMSG_TYPE_INT32 },
 485                 [MSG_BEACON_INTERVAL] = { "beacon_interval", BLOBMSG_TYPE_INT32 },
 486         };
 487         struct blob_attr *tb[__MSG_MAX];
 488         struct usteer_local_node *ln;
 489         struct usteer_node *node;
 490
 491         ln = container_of(req, struct usteer_local_node, req);
 492         node = &ln->node;
 493
 494         blobmsg_parse(policy, __MSG_MAX, tb, blob_data(msg), blob_len(msg));
 495         if (tb[MSG_FREQ])
 496                 node->freq = blobmsg_get_u32(tb[MSG_FREQ]);
 497         if (tb[MSG_CHANNEL])
 498                 node->channel = blobmsg_get_u32(tb[MSG_CHANNEL]);
 499         if (tb[MSG_OP_CLASS])
 500                 node->op_class = blobmsg_get_u32(tb[MSG_OP_CLASS]);
 501
 502         /* Local-Node */
 503         if (tb[MSG_BEACON_INTERVAL])
 504                 ln->beacon_interval = blobmsg_get_u32(tb[MSG_BEACON_INTERVAL]);
 505 }
 506
 507 static void
 508 usteer_local_node_rrm_nr_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 509 {
 510         static const struct blobmsg_policy policy = {
 511                 "value", BLOBMSG_TYPE_ARRAY
 512         };
 513         struct usteer_local_node *ln;
 514         struct blob_attr *tb;
 515
 516         ln = container_of(req, struct usteer_local_node, req);
 517
 518         blobmsg_parse(&policy, 1, &tb, blob_data(msg), blob_len(msg));
 519         if (!tb)
 520                 return;
 521
 522         usteer_node_set_blob(&ln->node.rrm_nr, tb);
 523 }
 524
 525 static void
 526 usteer_local_node_req_cb(struct ubus_request *req, int ret)
 527 {
 528         struct usteer_local_node *ln;
 529
 530         ln = container_of(req, struct usteer_local_node, req);
 531         uloop_timeout_set(&ln->req_timer, 1);
 532 }
 533
 534 static bool
 535 usteer_add_rrm_data(struct usteer_local_node *ln, struct usteer_node *node)
 536 {
 537         if (node == &ln->node)
 538                 return false;
 539
 540         if (!node->rrm_nr)
 541                 return false;
 542
 543         /* Remote node only adds same SSID. Required for local-node. */
 544         if (strcmp(ln->node.ssid, node->ssid) != 0)
 545                 return false;
 546
 547         blobmsg_add_field(&b, BLOBMSG_TYPE_ARRAY, "",
 548                           blobmsg_data(node->rrm_nr),
 549                           blobmsg_data_len(node->rrm_nr));
 550
 551         return true;
 552 }
 553
 554 static void
 555 usteer_local_node_prepare_rrm_set(struct usteer_local_node *ln)
 556 {
 557         struct usteer_node *node, *last_remote_neighbor = NULL;
 558         int i = 0;
 559         void *c;
 560
 561         c = blobmsg_open_array(&b, "list");
 562         for_each_local_node(node) {
 563                 if (i >= config.max_neighbor_reports)
 564                         break;
 565                 if (usteer_add_rrm_data(ln, node))
 566                         i++;
 567         }
 568
 569         while (i < config.max_neighbor_reports) {
 570                 node = usteer_node_get_next_neighbor(&ln->node, last_remote_neighbor);
 571                 if (!node) {
 572                         /* No more nodes available */
 573                         break;
 574                 }
 575
 576                 last_remote_neighbor = node;
 577                 if (usteer_add_rrm_data(ln, node))
 578                         i++;
 579         }
 580
 581         blobmsg_close_array(&b, c);
 582 }
 583
 584 static void
 585 usteer_local_node_state_next(struct uloop_timeout *timeout)
 586 {
 587         struct usteer_local_node *ln;
 588
 589         ln = container_of(timeout, struct usteer_local_node, req_timer);
 590
 591         ln->req_state++;
 592         if (ln->req_state >= __REQ_MAX) {
 593                 ln->req_state = REQ_IDLE;
 594                 return;
 595         }
 596
 597         blob_buf_init(&b, 0);
 598         switch (ln->req_state) {
 599         case REQ_CLIENTS:
 600                 ubus_invoke_async(ubus_ctx, ln->obj_id, "get_clients", b.head, &ln->req);
 601                 ln->req.data_cb = usteer_local_node_list_cb;
 602                 break;
 603         case REQ_STATUS:
 604                 ubus_invoke_async(ubus_ctx, ln->obj_id, "get_status", b.head, &ln->req);
 605                 ln->req.data_cb = usteer_local_node_status_cb;
 606                 break;
 607         case REQ_RRM_SET_LIST:
 608                 usteer_local_node_prepare_rrm_set(ln);
 609                 ubus_invoke_async(ubus_ctx, ln->obj_id, "rrm_nr_set", b.head, &ln->req);
 610                 ln->req.data_cb = NULL;
 611                 break;
 612         case REQ_RRM_GET_OWN:
 613                 ubus_invoke_async(ubus_ctx, ln->obj_id, "rrm_nr_get_own", b.head, &ln->req);
 614                 ln->req.data_cb = usteer_local_node_rrm_nr_cb;
 615                 break;
 616         default:
 617                 break;
 618         }
 619         ln->req.complete_cb = usteer_local_node_req_cb;
 620         ubus_complete_request_async(ubus_ctx, &ln->req);
 621 }
 622
 623 static void
 624 usteer_local_node_update(struct uloop_timeout *timeout)
 625 {
 626         struct usteer_local_node *ln;
 627         struct usteer_node_handler *h;
 628         struct usteer_node *node;
 629
 630         ln = container_of(timeout, struct usteer_local_node, update);
 631         node = &ln->node;
 632
 633         list_for_each_entry(h, &node_handlers, list) {
 634                 if (!h->update_node)
 635                         continue;
 636
 637                 h->update_node(node);
 638         }
 639
 640         usteer_local_node_state_reset(ln);
 641         uloop_timeout_set(&ln->req_timer, 1);
 642         usteer_local_node_kick(ln);
 643         usteer_band_steering_perform_steer(ln);
 644         uloop_timeout_set(timeout, config.local_sta_update);
 645 }
 646
 647 static void
 648 usteer_local_node_process_bss_tm_queries(struct uloop_timeout *timeout)
 649 {
 650         struct usteer_bss_tm_query *query, *tmp;
 651         struct usteer_local_node *ln;
 652         struct usteer_node *node;
 653         struct sta_info *si;
 654         struct sta *sta;
 655         uint8_t validity_period;
 656
 657         ln = container_of(timeout, struct usteer_local_node, bss_tm_queries_timeout);
 658         node = &ln->node;
 659
 660         validity_period = 10000 / usteer_local_node_get_beacon_interval(ln); /* ~ 10 seconds */
 661
 662         list_for_each_entry_safe(query, tmp, &ln->bss_tm_queries, list) {
 663                 sta = usteer_sta_get(query->sta_addr, false);
 664                 if (!sta)
 665                         continue;
 666
 667                 si = usteer_sta_info_get(sta, node, false);
 668                 if (!si)
 669                         continue;
 670
 671                 usteer_ubus_bss_transition_request(si, query->dialog_token, false, false, validity_period);
 672         }
 673
 674         /* Free pending queries we can not handle */
 675         usteer_local_node_pending_bss_tm_free(ln);
 676 }
 677
 678 static struct usteer_local_node *
 679 usteer_get_node(struct ubus_context *ctx, const char *name)
 680 {
 681         struct usteer_local_node *ln;
 682         struct usteer_node *node;
 683         char *str;
 684
 685         ln = avl_find_element(&local_nodes, name, ln, node.avl);
 686         if (ln)
 687                 return ln;
 688
 689         ln = calloc_a(sizeof(*ln), &str, strlen(name) + 1);
 690         node = &ln->node;
 691         node->type = NODE_TYPE_LOCAL;
 692         node->created = current_time;
 693         node->avl.key = strcpy(str, name);
 694         ln->ev.remove_cb = usteer_handle_remove;
 695         ln->ev.cb = usteer_handle_event;
 696         ln->update.cb = usteer_local_node_update;
 697         ln->req_timer.cb = usteer_local_node_state_next;
 698         ubus_register_subscriber(ctx, &ln->ev);
 699         avl_insert(&local_nodes, &node->avl);
 700         kvlist_init(&ln->node_info, kvlist_blob_len);
 701         INIT_LIST_HEAD(&node->sta_info);
 702         INIT_LIST_HEAD(&node->measurements);
 703
 704         ln->bss_tm_queries_timeout.cb = usteer_local_node_process_bss_tm_queries;
 705         INIT_LIST_HEAD(&ln->bss_tm_queries);
 706         return ln;
 707 }
 708
 709 static void
 710 usteer_node_run_update_script(struct usteer_node *node)
 711 {
 712         struct usteer_local_node *ln = container_of(node, struct usteer_local_node, node);
 713         char *val;
 714
 715         if (!node_up_script)
 716                 return;
 717
 718         val = alloca(strlen(node_up_script) + strlen(ln->iface) + 8);
 719         sprintf(val, "%s '%s'", node_up_script, ln->iface);
 720         if (system(val))
 721                 MSG(INFO, "failed to execute %s\n", val);
 722 }
 723
 724 static void
 725 usteer_check_node_enabled(struct usteer_local_node *ln)
 726 {
 727         bool ssid_disabled = config.ssid_list;
 728         struct blob_attr *cur;
 729         int rem;
 730
 731         blobmsg_for_each_attr(cur, config.ssid_list, rem) {
 732                 if (strcmp(blobmsg_get_string(cur), ln->node.ssid) != 0)
 733                         continue;
 734
 735                 ssid_disabled = false;
 736                 break;
 737         }
 738
 739         if (ln->node.disabled == ssid_disabled)
 740                 return;
 741
 742         ln->node.disabled = ssid_disabled;
 743
 744         if (ssid_disabled) {
 745                 MSG(INFO, "Disconnecting from local node %s\n", usteer_node_name(&ln->node));
 746                 usteer_local_node_state_reset(ln);
 747                 usteer_sta_node_cleanup(&ln->node);
 748                 usteer_measurement_report_node_cleanup(&ln->node);
 749                 uloop_timeout_cancel(&ln->update);
 750                 ubus_unsubscribe(ubus_ctx, &ln->ev, ln->obj_id);
 751                 return;
 752         }
 753
 754         MSG(INFO, "Connecting to local node %s\n", usteer_node_name(&ln->node));
 755         ubus_subscribe(ubus_ctx, &ln->ev, ln->obj_id);
 756         uloop_timeout_set(&ln->update, 1);
 757         usteer_node_run_update_script(&ln->node);
 758 }
 759
 760 static void
 761 usteer_register_node(struct ubus_context *ctx, const char *name, uint32_t id)
 762 {
 763         struct usteer_local_node *ln;
 764         struct usteer_node_handler *h;
 765         const char *iface;
 766         int offset = sizeof("hostapd.") - 1;
 767
 768         iface = name + offset;
 769         if (strncmp(name, "hostapd.", iface - name) != 0)
 770                 return;
 771
 772         MSG(INFO, "Creating local node %s\n", name);
 773         ln = usteer_get_node(ctx, name);
 774         ln->obj_id = id;
 775         ln->iface = usteer_node_name(&ln->node) + offset;
 776         ln->ifindex = if_nametoindex(ln->iface);
 777
 778         blob_buf_init(&b, 0);
 779         blobmsg_add_u32(&b, "notify_response", 1);
 780         ubus_invoke(ctx, id, "notify_response", b.head, NULL, NULL, 1000);
 781
 782         blob_buf_init(&b, 0);
 783         blobmsg_add_u8(&b, "neighbor_report", 1);
 784         blobmsg_add_u8(&b, "link_measurement", 1);
 785         blobmsg_add_u8(&b, "beacon_report", 1);
 786         blobmsg_add_u8(&b, "bss_transition", 1);
 787         ubus_invoke(ctx, id, "bss_mgmt_enable", b.head, NULL, NULL, 1000);
 788
 789         list_for_each_entry(h, &node_handlers, list) {
 790                 if (!h->init_node)
 791                         continue;
 792
 793                 h->init_node(&ln->node);
 794         }
 795
 796         ln->node.disabled = true;
 797         usteer_check_node_enabled(ln);
 798 }
 799
 800 static void
 801 usteer_event_handler(struct ubus_context *ctx, struct ubus_event_handler *ev,
 802                     const char *type, struct blob_attr *msg)
 803 {
 804         static const struct blobmsg_policy policy[2] = {
 805                 { .name = "id", .type = BLOBMSG_TYPE_INT32 },
 806                 { .name = "path", .type = BLOBMSG_TYPE_STRING },
 807         };
 808         struct blob_attr *tb[2];
 809         const char *path;
 810
 811         blobmsg_parse(policy, 2, tb, blob_data(msg), blob_len(msg));
 812
 813         if (!tb[0] || !tb[1])
 814                 return;
 815
 816         path = blobmsg_data(tb[1]);
 817         usteer_register_node(ctx, path, blobmsg_get_u32(tb[0]));
 818 }
 819
 820 static void
 821 usteer_register_events(struct ubus_context *ctx)
 822 {
 823         static struct ubus_event_handler handler = {
 824             .cb = usteer_event_handler
 825         };
 826
 827         ubus_register_event_handler(ctx, &handler, "ubus.object.add");
 828 }
 829
 830 static void
 831 node_list_cb(struct ubus_context *ctx, struct ubus_object_data *obj, void *priv)
 832 {
 833         usteer_register_node(ctx, obj->path, obj->id);
 834 }
 835
 836 int
 837 usteer_local_node_get_beacon_interval(struct usteer_local_node *ln)
 838 {
 839         /* Check if beacon-interval is not available (pre-21.02+) */
 840         if (ln->beacon_interval < 1)
 841                 return 100;
 842
 843         return ln->beacon_interval;
 844 }
 845
 846 void config_set_node_up_script(struct blob_attr *data)
 847 {
 848         const char *val;
 849         struct usteer_node *node;
 850
 851         if (!data)
 852                 return;
 853
 854         val = blobmsg_get_string(data);
 855         if (node_up_script && !strcmp(val, node_up_script))
 856                 return;
 857
 858         free(node_up_script);
 859
 860         if (!strlen(val)) {
 861                 node_up_script = NULL;
 862                 return;
 863         }
 864
 865         node_up_script = strdup(val);
 866
 867         for_each_local_node(node)
 868                 usteer_node_run_update_script(node);
 869 }
 870
 871 void config_get_node_up_script(struct blob_buf *buf)
 872 {
 873         if (!node_up_script)
 874                 return;
 875
 876         blobmsg_add_string(buf, "node_up_script", node_up_script);
 877 }
 878
 879 void config_set_ssid_list(struct blob_attr *data)
 880 {
 881         struct usteer_local_node *ln;
 882
 883         free(config.ssid_list);
 884
 885         if (data && blobmsg_len(data))
 886                 config.ssid_list = blob_memdup(data);
 887         else
 888                 config.ssid_list = NULL;
 889
 890         avl_for_each_element(&local_nodes, ln, node.avl)
 891                 usteer_check_node_enabled(ln);
 892 }
 893
 894 void config_get_ssid_list(struct blob_buf *buf)
 895 {
 896         if (config.ssid_list)
 897                 blobmsg_add_blob(buf, config.ssid_list);
 898 }
 899
 900 void
 901 usteer_local_nodes_init(struct ubus_context *ctx)
 902 {
 903         usteer_register_events(ctx);
 904         ubus_lookup(ctx, "hostapd.*", node_list_cb, NULL);
 905 }