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(struct sta_info *si, 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         int rem;
 359         int i = 0;
 360
 361         /* RRM */
 362         blobmsg_parse(&rrm_policy, 1, &rrm_blob, blobmsg_data(client_attr), blobmsg_data_len(client_attr));
 363         if (!rrm_blob)
 364                 return;
 365
 366         si->rrm = blobmsg_get_u32(blobmsg_data(rrm_blob));
 367
 368         /* Extended Capabilities / WNM */
 369         blobmsg_parse(&ext_capa_policy, 1, &wnm_blob, blobmsg_data(client_attr), blobmsg_data_len(client_attr));
 370         if (!wnm_blob)
 371                 return;
 372
 373         blobmsg_for_each_attr(cur, wnm_blob, rem) {
 374                 if (blobmsg_type(cur) != BLOBMSG_TYPE_INT32)
 375                         return;
 376
 377                 if (i == 2) {
 378                         if (blobmsg_get_u32(cur) & (1 << 3))
 379                                 si->bss_transition = true;
 380                 }
 381
 382                 i++;
 383         }
 384 }
 385
 386 static void
 387 usteer_local_node_set_assoc(struct usteer_local_node *ln, struct blob_attr *cl)
 388 {
 389         struct usteer_node *node = &ln->node;
 390         struct usteer_node_handler *h;
 391         struct blob_attr *cur;
 392         struct sta_info *si;
 393         struct sta *sta;
 394         int n_assoc = 0;
 395         int rem;
 396
 397         usteer_update_time();
 398
 399         list_for_each_entry(si, &node->sta_info, node_list) {
 400                 if (si->connected)
 401                         si->connected = STA_DISCONNECTED;
 402         }
 403
 404         blobmsg_for_each_attr(cur, cl, rem) {
 405                 uint8_t *addr = (uint8_t *) ether_aton(blobmsg_name(cur));
 406                 bool create;
 407
 408                 if (!addr)
 409                         continue;
 410
 411                 sta = usteer_sta_get(addr, true);
 412                 si = usteer_sta_info_get(sta, node, &create);
 413                 list_for_each_entry(h, &node_handlers, list) {
 414                         if (!h->update_sta)
 415                                 continue;
 416
 417                         h->update_sta(node, si);
 418                 }
 419                 usteer_local_node_assoc_update(si, cur);
 420                 if (si->connected == STA_CONNECTED) {
 421                         si->last_connected = current_time;
 422                         n_assoc++;
 423                 }
 424
 425                 /* Read RRM information */
 426                 usteer_local_node_update_sta_rrm_wnm(si, cur);
 427         }
 428
 429         node->n_assoc = n_assoc;
 430
 431         list_for_each_entry(si, &node->sta_info, node_list) {
 432                 if (si->connected != STA_DISCONNECTED)
 433                         continue;
 434
 435                 usteer_sta_disconnected(si);
 436                 MSG(VERBOSE, "station "MAC_ADDR_FMT" disconnected from node %s\n",
 437                         MAC_ADDR_DATA(si->sta->addr), usteer_node_name(node));
 438         }
 439 }
 440
 441 static void
 442 usteer_local_node_list_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 443 {
 444         enum {
 445                 MSG_FREQ,
 446                 MSG_CLIENTS,
 447                 __MSG_MAX,
 448         };
 449         static struct blobmsg_policy policy[__MSG_MAX] = {
 450                 [MSG_FREQ] = { "freq", BLOBMSG_TYPE_INT32 },
 451                 [MSG_CLIENTS] = { "clients", BLOBMSG_TYPE_TABLE },
 452         };
 453         struct blob_attr *tb[__MSG_MAX];
 454         struct usteer_local_node *ln;
 455         struct usteer_node *node;
 456
 457         ln = container_of(req, struct usteer_local_node, req);
 458         node = &ln->node;
 459
 460         blobmsg_parse(policy, __MSG_MAX, tb, blob_data(msg), blob_len(msg));
 461         if (!tb[MSG_FREQ] || !tb[MSG_CLIENTS])
 462                 return;
 463
 464         node->freq = blobmsg_get_u32(tb[MSG_FREQ]);
 465         usteer_local_node_set_assoc(ln, tb[MSG_CLIENTS]);
 466 }
 467
 468 static void
 469 usteer_local_node_status_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 470 {
 471         enum {
 472                 MSG_FREQ,
 473                 MSG_CHANNEL,
 474                 MSG_OP_CLASS,
 475                 MSG_BEACON_INTERVAL,
 476                 __MSG_MAX,
 477         };
 478         static struct blobmsg_policy policy[__MSG_MAX] = {
 479                 [MSG_FREQ] = { "freq", BLOBMSG_TYPE_INT32 },
 480                 [MSG_CHANNEL] = { "channel", BLOBMSG_TYPE_INT32 },
 481                 [MSG_OP_CLASS] = { "op_class", BLOBMSG_TYPE_INT32 },
 482                 [MSG_BEACON_INTERVAL] = { "beacon_interval", BLOBMSG_TYPE_INT32 },
 483         };
 484         struct blob_attr *tb[__MSG_MAX];
 485         struct usteer_local_node *ln;
 486         struct usteer_node *node;
 487
 488         ln = container_of(req, struct usteer_local_node, req);
 489         node = &ln->node;
 490
 491         blobmsg_parse(policy, __MSG_MAX, tb, blob_data(msg), blob_len(msg));
 492         if (tb[MSG_FREQ])
 493                 node->freq = blobmsg_get_u32(tb[MSG_FREQ]);
 494         if (tb[MSG_CHANNEL])
 495                 node->channel = blobmsg_get_u32(tb[MSG_CHANNEL]);
 496         if (tb[MSG_OP_CLASS])
 497                 node->op_class = blobmsg_get_u32(tb[MSG_OP_CLASS]);
 498
 499         /* Local-Node */
 500         if (tb[MSG_BEACON_INTERVAL])
 501                 ln->beacon_interval = blobmsg_get_u32(tb[MSG_BEACON_INTERVAL]);
 502 }
 503
 504 static void
 505 usteer_local_node_rrm_nr_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 506 {
 507         static const struct blobmsg_policy policy = {
 508                 "value", BLOBMSG_TYPE_ARRAY
 509         };
 510         struct usteer_local_node *ln;
 511         struct blob_attr *tb;
 512
 513         ln = container_of(req, struct usteer_local_node, req);
 514
 515         blobmsg_parse(&policy, 1, &tb, blob_data(msg), blob_len(msg));
 516         if (!tb)
 517                 return;
 518
 519         usteer_node_set_blob(&ln->node.rrm_nr, tb);
 520 }
 521
 522 static void
 523 usteer_local_node_req_cb(struct ubus_request *req, int ret)
 524 {
 525         struct usteer_local_node *ln;
 526
 527         ln = container_of(req, struct usteer_local_node, req);
 528         uloop_timeout_set(&ln->req_timer, 1);
 529 }
 530
 531 static bool
 532 usteer_add_rrm_data(struct usteer_local_node *ln, struct usteer_node *node)
 533 {
 534         if (node == &ln->node)
 535                 return false;
 536
 537         if (!node->rrm_nr)
 538                 return false;
 539
 540         /* Remote node only adds same SSID. Required for local-node. */
 541         if (strcmp(ln->node.ssid, node->ssid) != 0)
 542                 return false;
 543
 544         blobmsg_add_field(&b, BLOBMSG_TYPE_ARRAY, "",
 545                           blobmsg_data(node->rrm_nr),
 546                           blobmsg_data_len(node->rrm_nr));
 547
 548         return true;
 549 }
 550
 551 static void
 552 usteer_local_node_prepare_rrm_set(struct usteer_local_node *ln)
 553 {
 554         struct usteer_node *node, *last_remote_neighbor = NULL;
 555         int i = 0;
 556         void *c;
 557
 558         c = blobmsg_open_array(&b, "list");
 559         for_each_local_node(node) {
 560                 if (i >= config.max_neighbor_reports)
 561                         break;
 562                 if (usteer_add_rrm_data(ln, node))
 563                         i++;
 564         }
 565
 566         while (i < config.max_neighbor_reports) {
 567                 node = usteer_node_get_next_neighbor(&ln->node, last_remote_neighbor);
 568                 if (!node) {
 569                         /* No more nodes available */
 570                         break;
 571                 }
 572
 573                 last_remote_neighbor = node;
 574                 if (usteer_add_rrm_data(ln, node))
 575                         i++;
 576         }
 577
 578         blobmsg_close_array(&b, c);
 579 }
 580
 581 static void
 582 usteer_local_node_state_next(struct uloop_timeout *timeout)
 583 {
 584         struct usteer_local_node *ln;
 585
 586         ln = container_of(timeout, struct usteer_local_node, req_timer);
 587
 588         ln->req_state++;
 589         if (ln->req_state >= __REQ_MAX) {
 590                 ln->req_state = REQ_IDLE;
 591                 return;
 592         }
 593
 594         blob_buf_init(&b, 0);
 595         switch (ln->req_state) {
 596         case REQ_CLIENTS:
 597                 ubus_invoke_async(ubus_ctx, ln->obj_id, "get_clients", b.head, &ln->req);
 598                 ln->req.data_cb = usteer_local_node_list_cb;
 599                 break;
 600         case REQ_STATUS:
 601                 ubus_invoke_async(ubus_ctx, ln->obj_id, "get_status", b.head, &ln->req);
 602                 ln->req.data_cb = usteer_local_node_status_cb;
 603                 break;
 604         case REQ_RRM_SET_LIST:
 605                 usteer_local_node_prepare_rrm_set(ln);
 606                 ubus_invoke_async(ubus_ctx, ln->obj_id, "rrm_nr_set", b.head, &ln->req);
 607                 ln->req.data_cb = NULL;
 608                 break;
 609         case REQ_RRM_GET_OWN:
 610                 ubus_invoke_async(ubus_ctx, ln->obj_id, "rrm_nr_get_own", b.head, &ln->req);
 611                 ln->req.data_cb = usteer_local_node_rrm_nr_cb;
 612                 break;
 613         default:
 614                 break;
 615         }
 616         ln->req.complete_cb = usteer_local_node_req_cb;
 617         ubus_complete_request_async(ubus_ctx, &ln->req);
 618 }
 619
 620 static void
 621 usteer_local_node_update(struct uloop_timeout *timeout)
 622 {
 623         struct usteer_local_node *ln;
 624         struct usteer_node_handler *h;
 625         struct usteer_node *node;
 626
 627         ln = container_of(timeout, struct usteer_local_node, update);
 628         node = &ln->node;
 629
 630         list_for_each_entry(h, &node_handlers, list) {
 631                 if (!h->update_node)
 632                         continue;
 633
 634                 h->update_node(node);
 635         }
 636
 637         usteer_local_node_state_reset(ln);
 638         uloop_timeout_set(&ln->req_timer, 1);
 639         usteer_local_node_kick(ln);
 640         uloop_timeout_set(timeout, config.local_sta_update);
 641 }
 642
 643 static void
 644 usteer_local_node_process_bss_tm_queries(struct uloop_timeout *timeout)
 645 {
 646         struct usteer_bss_tm_query *query, *tmp;
 647         struct usteer_local_node *ln;
 648         struct usteer_node *node;
 649         struct sta_info *si;
 650         struct sta *sta;
 651         uint8_t validity_period;
 652
 653         ln = container_of(timeout, struct usteer_local_node, bss_tm_queries_timeout);
 654         node = &ln->node;
 655
 656         validity_period = 10000 / usteer_local_node_get_beacon_interval(ln); /* ~ 10 seconds */
 657
 658         list_for_each_entry_safe(query, tmp, &ln->bss_tm_queries, list) {
 659                 sta = usteer_sta_get(query->sta_addr, false);
 660                 if (!sta)
 661                         continue;
 662
 663                 si = usteer_sta_info_get(sta, node, false);
 664                 if (!si)
 665                         continue;
 666
 667                 usteer_ubus_bss_transition_request(si, query->dialog_token, false, false, validity_period);
 668         }
 669
 670         /* Free pending queries we can not handle */
 671         usteer_local_node_pending_bss_tm_free(ln);
 672 }
 673
 674 static struct usteer_local_node *
 675 usteer_get_node(struct ubus_context *ctx, const char *name)
 676 {
 677         struct usteer_local_node *ln;
 678         struct usteer_node *node;
 679         char *str;
 680
 681         ln = avl_find_element(&local_nodes, name, ln, node.avl);
 682         if (ln)
 683                 return ln;
 684
 685         ln = calloc_a(sizeof(*ln), &str, strlen(name) + 1);
 686         node = &ln->node;
 687         node->type = NODE_TYPE_LOCAL;
 688         node->created = current_time;
 689         node->avl.key = strcpy(str, name);
 690         ln->ev.remove_cb = usteer_handle_remove;
 691         ln->ev.cb = usteer_handle_event;
 692         ln->update.cb = usteer_local_node_update;
 693         ln->req_timer.cb = usteer_local_node_state_next;
 694         ubus_register_subscriber(ctx, &ln->ev);
 695         avl_insert(&local_nodes, &node->avl);
 696         kvlist_init(&ln->node_info, kvlist_blob_len);
 697         INIT_LIST_HEAD(&node->sta_info);
 698         INIT_LIST_HEAD(&node->measurements);
 699
 700         ln->bss_tm_queries_timeout.cb = usteer_local_node_process_bss_tm_queries;
 701         INIT_LIST_HEAD(&ln->bss_tm_queries);
 702         return ln;
 703 }
 704
 705 static void
 706 usteer_node_run_update_script(struct usteer_node *node)
 707 {
 708         struct usteer_local_node *ln = container_of(node, struct usteer_local_node, node);
 709         char *val;
 710
 711         if (!node_up_script)
 712                 return;
 713
 714         val = alloca(strlen(node_up_script) + strlen(ln->iface) + 8);
 715         sprintf(val, "%s '%s'", node_up_script, ln->iface);
 716         if (system(val))
 717                 MSG(INFO, "failed to execute %s\n", val);
 718 }
 719
 720 static void
 721 usteer_check_node_enabled(struct usteer_local_node *ln)
 722 {
 723         bool ssid_disabled = config.ssid_list;
 724         struct blob_attr *cur;
 725         int rem;
 726
 727         blobmsg_for_each_attr(cur, config.ssid_list, rem) {
 728                 if (strcmp(blobmsg_get_string(cur), ln->node.ssid) != 0)
 729                         continue;
 730
 731                 ssid_disabled = false;
 732                 break;
 733         }
 734
 735         if (ln->node.disabled == ssid_disabled)
 736                 return;
 737
 738         ln->node.disabled = ssid_disabled;
 739
 740         if (ssid_disabled) {
 741                 MSG(INFO, "Disconnecting from local node %s\n", usteer_node_name(&ln->node));
 742                 usteer_local_node_state_reset(ln);
 743                 usteer_sta_node_cleanup(&ln->node);
 744                 usteer_measurement_report_node_cleanup(&ln->node);
 745                 uloop_timeout_cancel(&ln->update);
 746                 ubus_unsubscribe(ubus_ctx, &ln->ev, ln->obj_id);
 747                 return;
 748         }
 749
 750         MSG(INFO, "Connecting to local node %s\n", usteer_node_name(&ln->node));
 751         ubus_subscribe(ubus_ctx, &ln->ev, ln->obj_id);
 752         uloop_timeout_set(&ln->update, 1);
 753         usteer_node_run_update_script(&ln->node);
 754 }
 755
 756 static void
 757 usteer_register_node(struct ubus_context *ctx, const char *name, uint32_t id)
 758 {
 759         struct usteer_local_node *ln;
 760         struct usteer_node_handler *h;
 761         const char *iface;
 762         int offset = sizeof("hostapd.") - 1;
 763
 764         iface = name + offset;
 765         if (strncmp(name, "hostapd.", iface - name) != 0)
 766                 return;
 767
 768         MSG(INFO, "Creating local node %s\n", name);
 769         ln = usteer_get_node(ctx, name);
 770         ln->obj_id = id;
 771         ln->iface = usteer_node_name(&ln->node) + offset;
 772         ln->ifindex = if_nametoindex(ln->iface);
 773
 774         blob_buf_init(&b, 0);
 775         blobmsg_add_u32(&b, "notify_response", 1);
 776         ubus_invoke(ctx, id, "notify_response", b.head, NULL, NULL, 1000);
 777
 778         blob_buf_init(&b, 0);
 779         blobmsg_add_u8(&b, "neighbor_report", 1);
 780         blobmsg_add_u8(&b, "beacon_report", 1);
 781         blobmsg_add_u8(&b, "bss_transition", 1);
 782         ubus_invoke(ctx, id, "bss_mgmt_enable", b.head, NULL, NULL, 1000);
 783
 784         list_for_each_entry(h, &node_handlers, list) {
 785                 if (!h->init_node)
 786                         continue;
 787
 788                 h->init_node(&ln->node);
 789         }
 790
 791         ln->node.disabled = true;
 792         usteer_check_node_enabled(ln);
 793 }
 794
 795 static void
 796 usteer_event_handler(struct ubus_context *ctx, struct ubus_event_handler *ev,
 797                     const char *type, struct blob_attr *msg)
 798 {
 799         static const struct blobmsg_policy policy[2] = {
 800                 { .name = "id", .type = BLOBMSG_TYPE_INT32 },
 801                 { .name = "path", .type = BLOBMSG_TYPE_STRING },
 802         };
 803         struct blob_attr *tb[2];
 804         const char *path;
 805
 806         blobmsg_parse(policy, 2, tb, blob_data(msg), blob_len(msg));
 807
 808         if (!tb[0] || !tb[1])
 809                 return;
 810
 811         path = blobmsg_data(tb[1]);
 812         usteer_register_node(ctx, path, blobmsg_get_u32(tb[0]));
 813 }
 814
 815 static void
 816 usteer_register_events(struct ubus_context *ctx)
 817 {
 818         static struct ubus_event_handler handler = {
 819             .cb = usteer_event_handler
 820         };
 821
 822         ubus_register_event_handler(ctx, &handler, "ubus.object.add");
 823 }
 824
 825 static void
 826 node_list_cb(struct ubus_context *ctx, struct ubus_object_data *obj, void *priv)
 827 {
 828         usteer_register_node(ctx, obj->path, obj->id);
 829 }
 830
 831 int
 832 usteer_local_node_get_beacon_interval(struct usteer_local_node *ln)
 833 {
 834         /* Check if beacon-interval is not available (pre-21.02+) */
 835         if (ln->beacon_interval < 1)
 836                 return 100;
 837
 838         return ln->beacon_interval;
 839 }
 840
 841 void config_set_node_up_script(struct blob_attr *data)
 842 {
 843         const char *val;
 844         struct usteer_node *node;
 845
 846         if (!data)
 847                 return;
 848
 849         val = blobmsg_get_string(data);
 850         if (node_up_script && !strcmp(val, node_up_script))
 851                 return;
 852
 853         free(node_up_script);
 854
 855         if (!strlen(val)) {
 856                 node_up_script = NULL;
 857                 return;
 858         }
 859
 860         node_up_script = strdup(val);
 861
 862         for_each_local_node(node)
 863                 usteer_node_run_update_script(node);
 864 }
 865
 866 void config_get_node_up_script(struct blob_buf *buf)
 867 {
 868         if (!node_up_script)
 869                 return;
 870
 871         blobmsg_add_string(buf, "node_up_script", node_up_script);
 872 }
 873
 874 void config_set_ssid_list(struct blob_attr *data)
 875 {
 876         struct usteer_local_node *ln;
 877
 878         free(config.ssid_list);
 879
 880         if (data && blobmsg_len(data))
 881                 config.ssid_list = blob_memdup(data);
 882         else
 883                 config.ssid_list = NULL;
 884
 885         avl_for_each_element(&local_nodes, ln, node.avl)
 886                 usteer_check_node_enabled(ln);
 887 }
 888
 889 void config_get_ssid_list(struct blob_buf *buf)
 890 {
 891         if (config.ssid_list)
 892                 blobmsg_add_blob(buf, config.ssid_list);
 893 }
 894
 895 void
 896 usteer_local_nodes_init(struct ubus_context *ctx)
 897 {
 898         usteer_register_events(ctx);
 899         ubus_lookup(ctx, "hostapd.*", node_list_cb, NULL);
 900 }