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