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         return 0;
 184 }
 185
 186 static int
 187 usteer_local_node_handle_beacon_report(struct usteer_local_node *ln, struct blob_attr *msg)
 188 {
 189         enum {
 190                 BR_ADDRESS,
 191                 BR_BSSID,
 192                 BR_RCPI,
 193                 BR_RSNI,
 194                 __BR_MAX
 195         };
 196         struct blobmsg_policy policy[__BR_MAX] = {
 197                 [BR_ADDRESS] = { .name = "address", .type = BLOBMSG_TYPE_STRING },
 198                 [BR_BSSID] = { .name = "bssid", .type = BLOBMSG_TYPE_STRING },
 199                 [BR_RCPI] = { .name = "rcpi", .type = BLOBMSG_TYPE_INT16 },
 200                 [BR_RSNI] = { .name = "rsni", .type = BLOBMSG_TYPE_INT16 },
 201         };
 202         struct blob_attr *tb[__BR_MAX];
 203
 204         struct usteer_beacon_report br;
 205         struct usteer_node *node;
 206         uint8_t *addr;
 207         struct sta *sta;
 208
 209         blobmsg_parse(policy, __BR_MAX, tb, blob_data(msg), blob_len(msg));
 210         if (!tb[BR_ADDRESS] || !tb[BR_BSSID] || !tb[BR_RCPI] || !tb[BR_RSNI])
 211                 return 0;
 212
 213         addr = (uint8_t *) ether_aton(blobmsg_get_string(tb[BR_ADDRESS]));
 214         if (!addr)
 215                 return 0;
 216
 217         sta = usteer_sta_get(addr, false);
 218         if (!sta)
 219                 return 0;
 220
 221         addr = (uint8_t *) ether_aton(blobmsg_get_string(tb[BR_BSSID]));
 222         if (!addr)
 223                 return 0;
 224
 225         node = usteer_node_by_bssid(addr);
 226         if (!node)
 227                 return 0;
 228
 229         br.rcpi = (uint8_t)blobmsg_get_u16(tb[BR_RCPI]);
 230         br.rsni = (uint8_t)blobmsg_get_u16(tb[BR_RSNI]);
 231
 232         usteer_measurement_report_add_beacon_report(sta, node, &br, current_time);
 233         return 0;
 234 }
 235
 236 static int
 237 usteer_handle_event(struct ubus_context *ctx, struct ubus_object *obj,
 238                    struct ubus_request_data *req, const char *method,
 239                    struct blob_attr *msg)
 240 {
 241         enum {
 242                 EVENT_ADDR,
 243                 EVENT_SIGNAL,
 244                 EVENT_TARGET,
 245                 EVENT_FREQ,
 246                 __EVENT_MAX
 247         };
 248         struct blobmsg_policy policy[__EVENT_MAX] = {
 249                 [EVENT_ADDR] = { .name = "address", .type = BLOBMSG_TYPE_STRING },
 250                 [EVENT_SIGNAL] = { .name = "signal", .type = BLOBMSG_TYPE_INT32 },
 251                 [EVENT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
 252                 [EVENT_FREQ] = { .name = "freq", .type = BLOBMSG_TYPE_INT32 },
 253         };
 254         enum usteer_event_type ev_type = __EVENT_TYPE_MAX;
 255         struct blob_attr *tb[__EVENT_MAX];
 256         struct usteer_local_node *ln;
 257         struct usteer_node *node;
 258         int signal = NO_SIGNAL;
 259         int freq = 0;
 260         const char *addr_str;
 261         const uint8_t *addr;
 262         int i;
 263         bool ret;
 264
 265         usteer_update_time();
 266
 267         ln = container_of(obj, struct usteer_local_node, ev.obj);
 268
 269         if(!strcmp(method, "bss-transition-query")) {
 270                 return usteer_handle_bss_tm_query(ln, msg);
 271         } else if(!strcmp(method, "bss-transition-response")) {
 272                 return usteer_handle_bss_tm_response(ln, msg);
 273         } else if(!strcmp(method, "beacon-report")) {
 274                 return usteer_local_node_handle_beacon_report(ln, msg);
 275         }
 276
 277         for (i = 0; i < ARRAY_SIZE(event_types); i++) {
 278                 if (strcmp(method, event_types[i]) != 0)
 279                         continue;
 280
 281                 ev_type = i;
 282                 break;
 283         }
 284
 285         ln = container_of(obj, struct usteer_local_node, ev.obj);
 286         node = &ln->node;
 287         blobmsg_parse(policy, __EVENT_MAX, tb, blob_data(msg), blob_len(msg));
 288         if (!tb[EVENT_ADDR] || !tb[EVENT_FREQ])
 289                 return UBUS_STATUS_INVALID_ARGUMENT;
 290
 291         if (tb[EVENT_SIGNAL])
 292                 signal = (int32_t) blobmsg_get_u32(tb[EVENT_SIGNAL]);
 293
 294         if (tb[EVENT_FREQ])
 295                 freq = blobmsg_get_u32(tb[EVENT_FREQ]);
 296
 297         addr_str = blobmsg_data(tb[EVENT_ADDR]);
 298         addr = (uint8_t *) ether_aton(addr_str);
 299         if (!addr)
 300                 return UBUS_STATUS_INVALID_ARGUMENT;
 301
 302         ret = usteer_handle_sta_event(node, addr, ev_type, freq, signal);
 303
 304         MSG(DEBUG, "received %s event from %s, signal=%d, freq=%d, handled:%s\n",
 305             method, addr_str, signal, freq, ret ? "true" : "false");
 306
 307         return ret ? 0 : 17 /* WLAN_STATUS_AP_UNABLE_TO_HANDLE_NEW_STA */;
 308 }
 309
 310 static void
 311 usteer_local_node_assoc_update(struct sta_info *si, struct blob_attr *data)
 312 {
 313         enum {
 314                 MSG_ASSOC,
 315                 __MSG_MAX,
 316         };
 317         static struct blobmsg_policy policy[__MSG_MAX] = {
 318                 [MSG_ASSOC] = { "assoc", BLOBMSG_TYPE_BOOL },
 319         };
 320         struct blob_attr *tb[__MSG_MAX];
 321         struct usteer_remote_node *rn;
 322         struct sta_info *remote_si;
 323
 324         blobmsg_parse(policy, __MSG_MAX, tb, blobmsg_data(data), blobmsg_data_len(data));
 325         if (tb[MSG_ASSOC] && blobmsg_get_u8(tb[MSG_ASSOC])) {
 326                 if (si->connected == STA_NOT_CONNECTED) {
 327                         /* New connection. Check if STA roamed. */
 328                         for_each_remote_node(rn) {
 329                                 remote_si = usteer_sta_info_get(si->sta, &rn->node, NULL);
 330                                 if (!remote_si)
 331                                         continue;
 332
 333                                 if (current_time - remote_si->last_connected < config.roam_process_timeout) {
 334                                         rn->node.roam_events.source++;
 335                                         /* Don't abort looking for roam sources here.
 336                                          * The client might have roamed via another node
 337                                          * within the roam-timeout.
 338                                          */
 339                                 }
 340                         }
 341                 }
 342                 si->connected = STA_CONNECTED;
 343         }
 344 }
 345
 346 static void
 347 usteer_local_node_update_sta_rrm_wnm(const uint8_t *addr, struct blob_attr *client_attr)
 348 {
 349         static const struct blobmsg_policy rrm_policy = {
 350                 .name = "rrm",
 351                 .type = BLOBMSG_TYPE_ARRAY,
 352         };
 353         static const struct blobmsg_policy ext_capa_policy = {
 354                 .name = "extended_capabilities",
 355                 .type = BLOBMSG_TYPE_ARRAY,
 356         };
 357         struct blob_attr *rrm_blob = NULL, *wnm_blob = NULL, *cur;
 358         struct sta *sta;
 359         int rem;
 360         int i = 0;
 361
 362         if (!addr)
 363                 return;
 364
 365         /* Don't create the STA */
 366         sta = usteer_sta_get(addr, false);
 367         if (!sta)
 368                 return;
 369
 370         /* RRM */
 371         blobmsg_parse(&rrm_policy, 1, &rrm_blob, blobmsg_data(client_attr), blobmsg_data_len(client_attr));
 372         if (!rrm_blob)
 373                 return;
 374
 375         sta->rrm = blobmsg_get_u32(blobmsg_data(rrm_blob));
 376
 377         /* Extended Capabilities / WNM */
 378         blobmsg_parse(&ext_capa_policy, 1, &wnm_blob, blobmsg_data(client_attr), blobmsg_data_len(client_attr));
 379         if (!wnm_blob)
 380                 return;
 381
 382         blobmsg_for_each_attr(cur, wnm_blob, rem) {
 383                 if (blobmsg_type(cur) != BLOBMSG_TYPE_INT32)
 384                         return;
 385
 386                 if (i == 2) {
 387                         if (blobmsg_get_u32(cur) & (1 << 3))
 388                                 sta->bss_transition = true;
 389                 }
 390
 391                 i++;
 392         }
 393 }
 394
 395 static void
 396 usteer_local_node_set_assoc(struct usteer_local_node *ln, struct blob_attr *cl)
 397 {
 398         struct usteer_node *node = &ln->node;
 399         struct usteer_node_handler *h;
 400         struct blob_attr *cur;
 401         struct sta_info *si;
 402         struct sta *sta;
 403         int n_assoc = 0;
 404         int rem;
 405
 406         usteer_update_time();
 407
 408         list_for_each_entry(si, &node->sta_info, node_list) {
 409                 if (si->connected)
 410                         si->connected = STA_DISCONNECTED;
 411         }
 412
 413         blobmsg_for_each_attr(cur, cl, rem) {
 414                 uint8_t *addr = (uint8_t *) ether_aton(blobmsg_name(cur));
 415                 bool create;
 416
 417                 if (!addr)
 418                         continue;
 419
 420                 sta = usteer_sta_get(addr, true);
 421                 si = usteer_sta_info_get(sta, node, &create);
 422                 list_for_each_entry(h, &node_handlers, list) {
 423                         if (!h->update_sta)
 424                                 continue;
 425
 426                         h->update_sta(node, si);
 427                 }
 428                 usteer_local_node_assoc_update(si, cur);
 429                 if (si->connected == STA_CONNECTED) {
 430                         si->last_connected = current_time;
 431                         n_assoc++;
 432                 }
 433
 434                 /* Read RRM information */
 435                 usteer_local_node_update_sta_rrm_wnm(addr, cur);
 436         }
 437
 438         node->n_assoc = n_assoc;
 439
 440         list_for_each_entry(si, &node->sta_info, node_list) {
 441                 if (si->connected != STA_DISCONNECTED)
 442                         continue;
 443
 444                 usteer_sta_disconnected(si);
 445                 MSG(VERBOSE, "station "MAC_ADDR_FMT" disconnected from node %s\n",
 446                         MAC_ADDR_DATA(si->sta->addr), usteer_node_name(node));
 447         }
 448 }
 449
 450 static void
 451 usteer_local_node_list_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 452 {
 453         enum {
 454                 MSG_FREQ,
 455                 MSG_CLIENTS,
 456                 __MSG_MAX,
 457         };
 458         static struct blobmsg_policy policy[__MSG_MAX] = {
 459                 [MSG_FREQ] = { "freq", BLOBMSG_TYPE_INT32 },
 460                 [MSG_CLIENTS] = { "clients", BLOBMSG_TYPE_TABLE },
 461         };
 462         struct blob_attr *tb[__MSG_MAX];
 463         struct usteer_local_node *ln;
 464         struct usteer_node *node;
 465
 466         ln = container_of(req, struct usteer_local_node, req);
 467         node = &ln->node;
 468
 469         blobmsg_parse(policy, __MSG_MAX, tb, blob_data(msg), blob_len(msg));
 470         if (!tb[MSG_FREQ] || !tb[MSG_CLIENTS])
 471                 return;
 472
 473         node->freq = blobmsg_get_u32(tb[MSG_FREQ]);
 474         usteer_local_node_set_assoc(ln, tb[MSG_CLIENTS]);
 475 }
 476
 477 static void
 478 usteer_local_node_status_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 479 {
 480         enum {
 481                 MSG_FREQ,
 482                 MSG_CHANNEL,
 483                 MSG_OP_CLASS,
 484                 MSG_BEACON_INTERVAL,
 485                 __MSG_MAX,
 486         };
 487         static struct blobmsg_policy policy[__MSG_MAX] = {
 488                 [MSG_FREQ] = { "freq", BLOBMSG_TYPE_INT32 },
 489                 [MSG_CHANNEL] = { "channel", BLOBMSG_TYPE_INT32 },
 490                 [MSG_OP_CLASS] = { "op_class", BLOBMSG_TYPE_INT32 },
 491                 [MSG_BEACON_INTERVAL] = { "beacon_interval", BLOBMSG_TYPE_INT32 },
 492         };
 493         struct blob_attr *tb[__MSG_MAX];
 494         struct usteer_local_node *ln;
 495         struct usteer_node *node;
 496
 497         ln = container_of(req, struct usteer_local_node, req);
 498         node = &ln->node;
 499
 500         blobmsg_parse(policy, __MSG_MAX, tb, blob_data(msg), blob_len(msg));
 501         if (tb[MSG_FREQ])
 502                 node->freq = blobmsg_get_u32(tb[MSG_FREQ]);
 503         if (tb[MSG_CHANNEL])
 504                 node->channel = blobmsg_get_u32(tb[MSG_CHANNEL]);
 505         if (tb[MSG_OP_CLASS])
 506                 node->op_class = blobmsg_get_u32(tb[MSG_OP_CLASS]);
 507
 508         /* Local-Node */
 509         if (tb[MSG_BEACON_INTERVAL])
 510                 ln->beacon_interval = blobmsg_get_u32(tb[MSG_BEACON_INTERVAL]);
 511 }
 512
 513 static void
 514 usteer_local_node_rrm_nr_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 515 {
 516         static const struct blobmsg_policy policy = {
 517                 "value", BLOBMSG_TYPE_ARRAY
 518         };
 519         struct usteer_local_node *ln;
 520         struct blob_attr *tb;
 521
 522         ln = container_of(req, struct usteer_local_node, req);
 523
 524         blobmsg_parse(&policy, 1, &tb, blob_data(msg), blob_len(msg));
 525         if (!tb)
 526                 return;
 527
 528         usteer_node_set_blob(&ln->node.rrm_nr, tb);
 529 }
 530
 531 static void
 532 usteer_local_node_req_cb(struct ubus_request *req, int ret)
 533 {
 534         struct usteer_local_node *ln;
 535
 536         ln = container_of(req, struct usteer_local_node, req);
 537         uloop_timeout_set(&ln->req_timer, 1);
 538 }
 539
 540 static bool
 541 usteer_add_rrm_data(struct usteer_local_node *ln, struct usteer_node *node)
 542 {
 543         if (node == &ln->node)
 544                 return false;
 545
 546         if (!node->rrm_nr)
 547                 return false;
 548
 549         /* Remote node only adds same SSID. Required for local-node. */
 550         if (strcmp(ln->node.ssid, node->ssid) != 0)
 551                 return false;
 552
 553         blobmsg_add_field(&b, BLOBMSG_TYPE_ARRAY, "",
 554                           blobmsg_data(node->rrm_nr),
 555                           blobmsg_data_len(node->rrm_nr));
 556
 557         return true;
 558 }
 559
 560 static void
 561 usteer_local_node_prepare_rrm_set(struct usteer_local_node *ln)
 562 {
 563         struct usteer_node *node, *last_remote_neighbor = NULL;
 564         int i = 0;
 565         void *c;
 566
 567         c = blobmsg_open_array(&b, "list");
 568         for_each_local_node(node) {
 569                 if (i >= config.max_neighbor_reports)
 570                         break;
 571                 if (usteer_add_rrm_data(ln, node))
 572                         i++;
 573         }
 574
 575         while (i < config.max_neighbor_reports) {
 576                 node = usteer_node_get_next_neighbor(&ln->node, last_remote_neighbor);
 577                 if (!node) {
 578                         /* No more nodes available */
 579                         break;
 580                 }
 581
 582                 last_remote_neighbor = node;
 583                 if (usteer_add_rrm_data(ln, node))
 584                         i++;
 585         }
 586
 587         blobmsg_close_array(&b, c);
 588 }
 589
 590 static void
 591 usteer_local_node_state_next(struct uloop_timeout *timeout)
 592 {
 593         struct usteer_local_node *ln;
 594
 595         ln = container_of(timeout, struct usteer_local_node, req_timer);
 596
 597         ln->req_state++;
 598         if (ln->req_state >= __REQ_MAX) {
 599                 ln->req_state = REQ_IDLE;
 600                 return;
 601         }
 602
 603         blob_buf_init(&b, 0);
 604         switch (ln->req_state) {
 605         case REQ_CLIENTS:
 606                 ubus_invoke_async(ubus_ctx, ln->obj_id, "get_clients", b.head, &ln->req);
 607                 ln->req.data_cb = usteer_local_node_list_cb;
 608                 break;
 609         case REQ_STATUS:
 610                 ubus_invoke_async(ubus_ctx, ln->obj_id, "get_status", b.head, &ln->req);
 611                 ln->req.data_cb = usteer_local_node_status_cb;
 612                 break;
 613         case REQ_RRM_SET_LIST:
 614                 usteer_local_node_prepare_rrm_set(ln);
 615                 ubus_invoke_async(ubus_ctx, ln->obj_id, "rrm_nr_set", b.head, &ln->req);
 616                 ln->req.data_cb = NULL;
 617                 break;
 618         case REQ_RRM_GET_OWN:
 619                 ubus_invoke_async(ubus_ctx, ln->obj_id, "rrm_nr_get_own", b.head, &ln->req);
 620                 ln->req.data_cb = usteer_local_node_rrm_nr_cb;
 621                 break;
 622         default:
 623                 break;
 624         }
 625         ln->req.complete_cb = usteer_local_node_req_cb;
 626         ubus_complete_request_async(ubus_ctx, &ln->req);
 627 }
 628
 629 static void
 630 usteer_local_node_update(struct uloop_timeout *timeout)
 631 {
 632         struct usteer_local_node *ln;
 633         struct usteer_node_handler *h;
 634         struct usteer_node *node;
 635
 636         ln = container_of(timeout, struct usteer_local_node, update);
 637         node = &ln->node;
 638
 639         list_for_each_entry(h, &node_handlers, list) {
 640                 if (!h->update_node)
 641                         continue;
 642
 643                 h->update_node(node);
 644         }
 645
 646         usteer_local_node_state_reset(ln);
 647         uloop_timeout_set(&ln->req_timer, 1);
 648         usteer_local_node_kick(ln);
 649         uloop_timeout_set(timeout, config.local_sta_update);
 650 }
 651
 652 static void
 653 usteer_local_node_process_bss_tm_queries(struct uloop_timeout *timeout)
 654 {
 655         struct usteer_bss_tm_query *query, *tmp;
 656         struct usteer_local_node *ln;
 657         struct usteer_node *node;
 658         struct sta_info *si;
 659         struct sta *sta;
 660         uint8_t validity_period;
 661
 662         ln = container_of(timeout, struct usteer_local_node, bss_tm_queries_timeout);
 663         node = &ln->node;
 664
 665         validity_period = 10000 / usteer_local_node_get_beacon_interval(ln); /* ~ 10 seconds */
 666
 667         list_for_each_entry_safe(query, tmp, &ln->bss_tm_queries, list) {
 668                 sta = usteer_sta_get(query->sta_addr, false);
 669                 if (!sta)
 670                         continue;
 671
 672                 si = usteer_sta_info_get(sta, node, false);
 673                 if (!si)
 674                         continue;
 675
 676                 usteer_ubus_bss_transition_request(si, query->dialog_token, false, false, validity_period);
 677         }
 678
 679         /* Free pending queries we can not handle */
 680         usteer_local_node_pending_bss_tm_free(ln);
 681 }
 682
 683 static struct usteer_local_node *
 684 usteer_get_node(struct ubus_context *ctx, const char *name)
 685 {
 686         struct usteer_local_node *ln;
 687         struct usteer_node *node;
 688         char *str;
 689
 690         ln = avl_find_element(&local_nodes, name, ln, node.avl);
 691         if (ln)
 692                 return ln;
 693
 694         ln = calloc_a(sizeof(*ln), &str, strlen(name) + 1);
 695         node = &ln->node;
 696         node->type = NODE_TYPE_LOCAL;
 697         node->created = current_time;
 698         node->avl.key = strcpy(str, name);
 699         ln->ev.remove_cb = usteer_handle_remove;
 700         ln->ev.cb = usteer_handle_event;
 701         ln->update.cb = usteer_local_node_update;
 702         ln->req_timer.cb = usteer_local_node_state_next;
 703         ubus_register_subscriber(ctx, &ln->ev);
 704         avl_insert(&local_nodes, &node->avl);
 705         kvlist_init(&ln->node_info, kvlist_blob_len);
 706         INIT_LIST_HEAD(&node->sta_info);
 707         INIT_LIST_HEAD(&node->measurements);
 708
 709         ln->bss_tm_queries_timeout.cb = usteer_local_node_process_bss_tm_queries;
 710         INIT_LIST_HEAD(&ln->bss_tm_queries);
 711         return ln;
 712 }
 713
 714 static void
 715 usteer_node_run_update_script(struct usteer_node *node)
 716 {
 717         struct usteer_local_node *ln = container_of(node, struct usteer_local_node, node);
 718         char *val;
 719
 720         if (!node_up_script)
 721                 return;
 722
 723         val = alloca(strlen(node_up_script) + strlen(ln->iface) + 8);
 724         sprintf(val, "%s '%s'", node_up_script, ln->iface);
 725         if (system(val))
 726                 MSG(INFO, "failed to execute %s\n", val);
 727 }
 728
 729 static void
 730 usteer_check_node_enabled(struct usteer_local_node *ln)
 731 {
 732         bool ssid_disabled = config.ssid_list;
 733         struct blob_attr *cur;
 734         int rem;
 735
 736         blobmsg_for_each_attr(cur, config.ssid_list, rem) {
 737                 if (strcmp(blobmsg_get_string(cur), ln->node.ssid) != 0)
 738                         continue;
 739
 740                 ssid_disabled = false;
 741                 break;
 742         }
 743
 744         if (ln->node.disabled == ssid_disabled)
 745                 return;
 746
 747         ln->node.disabled = ssid_disabled;
 748
 749         if (ssid_disabled) {
 750                 MSG(INFO, "Disconnecting from local node %s\n", usteer_node_name(&ln->node));
 751                 usteer_local_node_state_reset(ln);
 752                 usteer_sta_node_cleanup(&ln->node);
 753                 usteer_measurement_report_node_cleanup(&ln->node);
 754                 uloop_timeout_cancel(&ln->update);
 755                 ubus_unsubscribe(ubus_ctx, &ln->ev, ln->obj_id);
 756                 return;
 757         }
 758
 759         MSG(INFO, "Connecting to local node %s\n", usteer_node_name(&ln->node));
 760         ubus_subscribe(ubus_ctx, &ln->ev, ln->obj_id);
 761         uloop_timeout_set(&ln->update, 1);
 762         usteer_node_run_update_script(&ln->node);
 763 }
 764
 765 static void
 766 usteer_register_node(struct ubus_context *ctx, const char *name, uint32_t id)
 767 {
 768         struct usteer_local_node *ln;
 769         struct usteer_node_handler *h;
 770         const char *iface;
 771         int offset = sizeof("hostapd.") - 1;
 772
 773         iface = name + offset;
 774         if (strncmp(name, "hostapd.", iface - name) != 0)
 775                 return;
 776
 777         MSG(INFO, "Creating local node %s\n", name);
 778         ln = usteer_get_node(ctx, name);
 779         ln->obj_id = id;
 780         ln->iface = usteer_node_name(&ln->node) + offset;
 781         ln->ifindex = if_nametoindex(ln->iface);
 782
 783         blob_buf_init(&b, 0);
 784         blobmsg_add_u32(&b, "notify_response", 1);
 785         ubus_invoke(ctx, id, "notify_response", b.head, NULL, NULL, 1000);
 786
 787         blob_buf_init(&b, 0);
 788         blobmsg_add_u8(&b, "neighbor_report", 1);
 789         blobmsg_add_u8(&b, "beacon_report", 1);
 790         blobmsg_add_u8(&b, "bss_transition", 1);
 791         ubus_invoke(ctx, id, "bss_mgmt_enable", b.head, NULL, NULL, 1000);
 792
 793         list_for_each_entry(h, &node_handlers, list) {
 794                 if (!h->init_node)
 795                         continue;
 796
 797                 h->init_node(&ln->node);
 798         }
 799
 800         ln->node.disabled = true;
 801         usteer_check_node_enabled(ln);
 802 }
 803
 804 static void
 805 usteer_event_handler(struct ubus_context *ctx, struct ubus_event_handler *ev,
 806                     const char *type, struct blob_attr *msg)
 807 {
 808         static const struct blobmsg_policy policy[2] = {
 809                 { .name = "id", .type = BLOBMSG_TYPE_INT32 },
 810                 { .name = "path", .type = BLOBMSG_TYPE_STRING },
 811         };
 812         struct blob_attr *tb[2];
 813         const char *path;
 814
 815         blobmsg_parse(policy, 2, tb, blob_data(msg), blob_len(msg));
 816
 817         if (!tb[0] || !tb[1])
 818                 return;
 819
 820         path = blobmsg_data(tb[1]);
 821         usteer_register_node(ctx, path, blobmsg_get_u32(tb[0]));
 822 }
 823
 824 static void
 825 usteer_register_events(struct ubus_context *ctx)
 826 {
 827         static struct ubus_event_handler handler = {
 828             .cb = usteer_event_handler
 829         };
 830
 831         ubus_register_event_handler(ctx, &handler, "ubus.object.add");
 832 }
 833
 834 static void
 835 node_list_cb(struct ubus_context *ctx, struct ubus_object_data *obj, void *priv)
 836 {
 837         usteer_register_node(ctx, obj->path, obj->id);
 838 }
 839
 840 int
 841 usteer_local_node_get_beacon_interval(struct usteer_local_node *ln)
 842 {
 843         /* Check if beacon-interval is not available (pre-21.02+) */
 844         if (ln->beacon_interval < 1)
 845                 return 100;
 846
 847         return ln->beacon_interval;
 848 }
 849
 850 void config_set_node_up_script(struct blob_attr *data)
 851 {
 852         const char *val;
 853         struct usteer_node *node;
 854
 855         if (!data)
 856                 return;
 857
 858         val = blobmsg_get_string(data);
 859         if (node_up_script && !strcmp(val, node_up_script))
 860                 return;
 861
 862         free(node_up_script);
 863
 864         if (!strlen(val)) {
 865                 node_up_script = NULL;
 866                 return;
 867         }
 868
 869         node_up_script = strdup(val);
 870
 871         for_each_local_node(node)
 872                 usteer_node_run_update_script(node);
 873 }
 874
 875 void config_get_node_up_script(struct blob_buf *buf)
 876 {
 877         if (!node_up_script)
 878                 return;
 879
 880         blobmsg_add_string(buf, "node_up_script", node_up_script);
 881 }
 882
 883 void config_set_ssid_list(struct blob_attr *data)
 884 {
 885         struct usteer_local_node *ln;
 886
 887         free(config.ssid_list);
 888
 889         if (data && blobmsg_len(data))
 890                 config.ssid_list = blob_memdup(data);
 891         else
 892                 config.ssid_list = NULL;
 893
 894         avl_for_each_element(&local_nodes, ln, node.avl)
 895                 usteer_check_node_enabled(ln);
 896 }
 897
 898 void config_get_ssid_list(struct blob_buf *buf)
 899 {
 900         if (config.ssid_list)
 901                 blobmsg_add_blob(buf, config.ssid_list);
 902 }
 903
 904 void
 905 usteer_local_nodes_init(struct ubus_context *ctx)
 906 {
 907         usteer_register_events(ctx);
 908         ubus_lookup(ctx, "hostapd.*", node_list_cb, NULL);
 909 }