local_node.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; either version 2 of the License.
   5  *
   6  *   This program is distributed in the hope that it will be useful,
   7  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9  *   GNU General Public License for more details.
  10  *
  11  *   You should have received a copy of the GNU General Public License
  12  *   along with this program; if not, write to the Free Software
  13  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  14  *
  15  *   Copyright (C) 2020 embedd.ch
  16  *   Copyright (C) 2020 Felix Fietkau <nbd@nbd.name>
  17  *   Copyright (C) 2020 John Crispin <john@phrozen.org>
  18  */
  19
  20 #include <sys/types.h>
  21 #include <sys/socket.h>
  22 #include <net/ethernet.h>
  23 #ifdef linux
  24 #include <netinet/ether.h>
  25 #endif
  26 #include <net/if.h>
  27 #include <stdlib.h>
  28
  29 #include <libubox/avl-cmp.h>
  30 #include <libubox/blobmsg_json.h>
  31 #include "usteer.h"
  32 #include "node.h"
  33
  34 AVL_TREE(local_nodes, avl_strcmp, false, NULL);
  35 static struct blob_buf b;
  36 static char *node_up_script;
  37
  38 static void
  39 usteer_local_node_state_reset(struct usteer_local_node *ln)
  40 {
  41         if (ln->req_state == REQ_IDLE)
  42                 return;
  43
  44         ubus_abort_request(ubus_ctx, &ln->req);
  45         uloop_timeout_cancel(&ln->req_timer);
  46         ln->req_state = REQ_IDLE;
  47 }
  48
  49 static void
  50 usteer_local_node_pending_bss_tm_free(struct usteer_local_node *ln)
  51 {
  52         struct usteer_bss_tm_query *query, *tmp;
  53
  54         list_for_each_entry_safe(query, tmp, &ln->bss_tm_queries, list) {
  55                 list_del(&query->list);
  56                 free(query);
  57         }
  58 }
  59
  60 static void
  61 usteer_free_node(struct ubus_context *ctx, struct usteer_local_node *ln)
  62 {
  63         struct usteer_node_handler *h;
  64
  65         list_for_each_entry(h, &node_handlers, list) {
  66                 if (!h->free_node)
  67                         continue;
  68                 h->free_node(&ln->node);
  69         }
  70
  71         usteer_local_node_pending_bss_tm_free(ln);
  72         usteer_local_node_state_reset(ln);
  73         usteer_sta_node_cleanup(&ln->node);
  74         usteer_measurement_report_node_cleanup(&ln->node);
  75         uloop_timeout_cancel(&ln->update);
  76         uloop_timeout_cancel(&ln->bss_tm_queries_timeout);
  77         avl_delete(&local_nodes, &ln->node.avl);
  78         ubus_unregister_subscriber(ctx, &ln->ev);
  79         kvlist_free(&ln->node_info);
  80         free(ln);
  81 }
  82
  83 struct usteer_local_node *usteer_local_node_by_bssid(uint8_t *bssid) {
  84         struct usteer_local_node *ln;
  85         struct usteer_node *n;
  86
  87         for_each_local_node(n) {
  88                 ln = container_of(n, struct usteer_local_node, node);
  89                 if (!memcmp(n->bssid, bssid, 6))
  90                         return ln;
  91         }
  92
  93         return NULL;
  94 }
  95
  96 static void
  97 usteer_handle_remove(struct ubus_context *ctx, struct ubus_subscriber *s,
  98                     uint32_t id)
  99 {
 100         struct usteer_local_node *ln = container_of(s, struct usteer_local_node, ev);
 101
 102         usteer_free_node(ctx, ln);
 103 }
 104
 105 static int
 106 usteer_handle_bss_tm_query(struct usteer_local_node *ln, struct blob_attr *msg)
 107 {
 108         enum {
 109                 BSS_TM_QUERY_ADDRESS,
 110                 BSS_TM_QUERY_DIALOG_TOKEN,
 111                 BSS_TM_QUERY_CANDIDATE_LIST,
 112                 __BSS_TM_QUERY_MAX
 113         };
 114         struct blobmsg_policy policy[__BSS_TM_QUERY_MAX] = {
 115                 [BSS_TM_QUERY_ADDRESS] = { .name = "address", .type = BLOBMSG_TYPE_STRING },
 116                 [BSS_TM_QUERY_DIALOG_TOKEN] = { .name = "dialog-token", .type = BLOBMSG_TYPE_INT8 },
 117                 [BSS_TM_QUERY_CANDIDATE_LIST] = { .name = "candidate-list", .type = BLOBMSG_TYPE_STRING },
 118         };
 119         struct blob_attr *tb[__BSS_TM_QUERY_MAX];
 120         struct usteer_bss_tm_query *query;
 121         uint8_t *sta_addr;
 122
 123         blobmsg_parse(policy, __BSS_TM_QUERY_MAX, tb, blob_data(msg), blob_len(msg));
 124
 125         if (!tb[BSS_TM_QUERY_ADDRESS] || !tb[BSS_TM_QUERY_DIALOG_TOKEN])
 126                 return 0;
 127
 128         query = calloc(1, sizeof(*query));
 129         if (!query)
 130                 return 0;
 131
 132         query->dialog_token = blobmsg_get_u8(tb[BSS_TM_QUERY_DIALOG_TOKEN]);
 133
 134         sta_addr = (uint8_t *) ether_aton(blobmsg_get_string(tb[BSS_TM_QUERY_ADDRESS]));
 135         if (!sta_addr)
 136                 return 0;
 137
 138         memcpy(query->sta_addr, sta_addr, 6);
 139
 140         list_add(&query->list, &ln->bss_tm_queries);
 141         uloop_timeout_set(&ln->bss_tm_queries_timeout, 1);
 142
 143         return 1;
 144 }
 145
 146 static int
 147 usteer_handle_bss_tm_response(struct usteer_local_node *ln, struct blob_attr *msg)
 148 {
 149         enum {
 150                 BSS_TM_RESPONSE_ADDRESS,
 151                 BSS_TM_RESPONSE_STATUS_CODE,
 152                 __BSS_TM_RESPONSE_MAX
 153         };
 154         struct blobmsg_policy policy[__BSS_TM_RESPONSE_MAX] = {
 155                 [BSS_TM_RESPONSE_ADDRESS] = { .name = "address", .type = BLOBMSG_TYPE_STRING },
 156                 [BSS_TM_RESPONSE_STATUS_CODE] = { .name = "status-code", .type = BLOBMSG_TYPE_INT8 },
 157         };
 158         struct blob_attr *tb[__BSS_TM_RESPONSE_MAX];
 159         struct sta_info *si;
 160         struct sta *sta;
 161         uint8_t *sta_addr;
 162
 163         blobmsg_parse(policy, __BSS_TM_RESPONSE_MAX, tb, blob_data(msg), blob_len(msg));
 164
 165         if (!tb[BSS_TM_RESPONSE_ADDRESS] || !tb[BSS_TM_RESPONSE_STATUS_CODE])
 166                 return 0;
 167
 168         sta_addr = (uint8_t *) ether_aton(blobmsg_get_string(tb[BSS_TM_RESPONSE_ADDRESS]));
 169         if (!sta_addr)
 170                 return 0;
 171
 172         sta = usteer_sta_get(sta_addr, false);
 173         if (!sta)
 174                 return 0;
 175
 176         si = usteer_sta_info_get(sta, &ln->node, false);
 177         if (!si)
 178                 return 0;
 179
 180         si->bss_transition_response.status_code = blobmsg_get_u8(tb[BSS_TM_RESPONSE_STATUS_CODE]);
 181         si->bss_transition_response.timestamp = current_time;
 182
 183         if (si->bss_transition_response.status_code) {
 184                 /* Cancel imminent kick in case BSS transition was rejected */
 185                 si->kick_time = 0;
 186         }
 187
 188         return 0;
 189 }
 190
 191 static int
 192 usteer_local_node_handle_beacon_report(struct usteer_local_node *ln, struct blob_attr *msg)
 193 {
 194         enum {
 195                 BR_ADDRESS,
 196                 BR_BSSID,
 197                 BR_RCPI,
 198                 BR_RSNI,
 199                 __BR_MAX
 200         };
 201         struct blobmsg_policy policy[__BR_MAX] = {
 202                 [BR_ADDRESS] = { .name = "address", .type = BLOBMSG_TYPE_STRING },
 203                 [BR_BSSID] = { .name = "bssid", .type = BLOBMSG_TYPE_STRING },
 204                 [BR_RCPI] = { .name = "rcpi", .type = BLOBMSG_TYPE_INT16 },
 205                 [BR_RSNI] = { .name = "rsni", .type = BLOBMSG_TYPE_INT16 },
 206         };
 207         struct blob_attr *tb[__BR_MAX];
 208         struct usteer_node *node;
 209         uint8_t *addr;
 210         struct sta *sta;
 211
 212         blobmsg_parse(policy, __BR_MAX, tb, blob_data(msg), blob_len(msg));
 213         if (!tb[BR_ADDRESS] || !tb[BR_BSSID] || !tb[BR_RCPI] || !tb[BR_RSNI])
 214                 return 0;
 215
 216         addr = (uint8_t *) ether_aton(blobmsg_get_string(tb[BR_ADDRESS]));
 217         if (!addr)
 218                 return 0;
 219
 220         sta = usteer_sta_get(addr, false);
 221         if (!sta)
 222                 return 0;
 223
 224         addr = (uint8_t *) ether_aton(blobmsg_get_string(tb[BR_BSSID]));
 225         if (!addr)
 226                 return 0;
 227
 228         node = usteer_node_by_bssid(addr);
 229         if (!node)
 230                 return 0;
 231
 232         usteer_measurement_report_add(sta, node,
 233                                       (uint8_t)blobmsg_get_u16(tb[BR_RCPI]),
 234                                       (uint8_t)blobmsg_get_u16(tb[BR_RSNI]),
 235                                       current_time);
 236         return 0;
 237 }
 238
 239 static int
 240 usteer_local_node_handle_link_measurement_report(struct usteer_local_node *ln, struct blob_attr *msg)
 241 {
 242         enum {
 243                 LMR_ADDRESS,
 244                 LMR_RCPI,
 245                 LMR_RSNI,
 246                 __LMR_MAX
 247         };
 248         struct blobmsg_policy policy[__LMR_MAX] = {
 249                 [LMR_ADDRESS] = { .name = "address", .type = BLOBMSG_TYPE_STRING },
 250                 [LMR_RCPI] = { .name = "rcpi", .type = BLOBMSG_TYPE_INT16 },
 251                 [LMR_RSNI] = { .name = "rsni", .type = BLOBMSG_TYPE_INT16 },
 252         };
 253         struct blob_attr *tb[__LMR_MAX];
 254         uint8_t *addr;
 255         struct sta *sta;
 256
 257         blobmsg_parse(policy, __LMR_MAX, tb, blob_data(msg), blob_len(msg));
 258         if (!tb[LMR_ADDRESS] || !tb[LMR_RCPI] || !tb[LMR_RSNI])
 259                 return 0;
 260
 261         addr = (uint8_t *) ether_aton(blobmsg_get_string(tb[LMR_ADDRESS]));
 262         if (!addr)
 263                 return 0;
 264
 265         sta = usteer_sta_get(addr, false);
 266         if (!sta)
 267                 return 0;
 268
 269         usteer_measurement_report_add(sta, &ln->node,
 270                                       (uint8_t)blobmsg_get_u16(tb[LMR_RCPI]),
 271                                       (uint8_t)blobmsg_get_u16(tb[LMR_RSNI]),
 272                                       current_time);
 273         return 0;
 274 }
 275
 276 static int
 277 usteer_handle_event(struct ubus_context *ctx, struct ubus_object *obj,
 278                    struct ubus_request_data *req, const char *method,
 279                    struct blob_attr *msg)
 280 {
 281         enum {
 282                 EVENT_ADDR,
 283                 EVENT_SIGNAL,
 284                 EVENT_TARGET,
 285                 EVENT_FREQ,
 286                 __EVENT_MAX
 287         };
 288         struct blobmsg_policy policy[__EVENT_MAX] = {
 289                 [EVENT_ADDR] = { .name = "address", .type = BLOBMSG_TYPE_STRING },
 290                 [EVENT_SIGNAL] = { .name = "signal", .type = BLOBMSG_TYPE_INT32 },
 291                 [EVENT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
 292                 [EVENT_FREQ] = { .name = "freq", .type = BLOBMSG_TYPE_INT32 },
 293         };
 294         enum usteer_event_type ev_type = __EVENT_TYPE_MAX;
 295         struct blob_attr *tb[__EVENT_MAX];
 296         struct usteer_local_node *ln;
 297         struct usteer_node *node;
 298         int signal = NO_SIGNAL;
 299         int freq = 0;
 300         const char *addr_str;
 301         const uint8_t *addr;
 302         int i;
 303         bool ret;
 304
 305         usteer_update_time();
 306
 307         ln = container_of(obj, struct usteer_local_node, ev.obj);
 308
 309         if(!strcmp(method, "bss-transition-query")) {
 310                 return usteer_handle_bss_tm_query(ln, msg);
 311         } else if(!strcmp(method, "bss-transition-response")) {
 312                 return usteer_handle_bss_tm_response(ln, msg);
 313         } else if(!strcmp(method, "beacon-report")) {
 314                 return usteer_local_node_handle_beacon_report(ln, msg);
 315         } else if(!strcmp(method, "link-measurement-report")) {
 316                 return usteer_local_node_handle_link_measurement_report(ln, msg);
 317         }
 318
 319         for (i = 0; i < ARRAY_SIZE(event_types); i++) {
 320                 if (strcmp(method, event_types[i]) != 0)
 321                         continue;
 322
 323                 ev_type = i;
 324                 break;
 325         }
 326
 327         ln = container_of(obj, struct usteer_local_node, ev.obj);
 328         node = &ln->node;
 329         blobmsg_parse(policy, __EVENT_MAX, tb, blob_data(msg), blob_len(msg));
 330         if (!tb[EVENT_ADDR] || !tb[EVENT_FREQ])
 331                 return UBUS_STATUS_INVALID_ARGUMENT;
 332
 333         if (tb[EVENT_SIGNAL])
 334                 signal = (int32_t) blobmsg_get_u32(tb[EVENT_SIGNAL]);
 335
 336         if (tb[EVENT_FREQ])
 337                 freq = blobmsg_get_u32(tb[EVENT_FREQ]);
 338
 339         addr_str = blobmsg_data(tb[EVENT_ADDR]);
 340         addr = (uint8_t *) ether_aton(addr_str);
 341         if (!addr)
 342                 return UBUS_STATUS_INVALID_ARGUMENT;
 343
 344         ret = usteer_handle_sta_event(node, addr, ev_type, freq, signal);
 345
 346         MSG(DEBUG, "received %s event from %s, signal=%d, freq=%d, handled:%s\n",
 347             method, addr_str, signal, freq, ret ? "true" : "false");
 348
 349         return ret ? 0 : 17 /* WLAN_STATUS_AP_UNABLE_TO_HANDLE_NEW_STA */;
 350 }
 351
 352 static void
 353 usteer_local_node_assoc_update(struct sta_info *si, struct blob_attr *data)
 354 {
 355         enum {
 356                 MSG_ASSOC,
 357                 __MSG_MAX,
 358         };
 359         static struct blobmsg_policy policy[__MSG_MAX] = {
 360                 [MSG_ASSOC] = { "assoc", BLOBMSG_TYPE_BOOL },
 361         };
 362         struct blob_attr *tb[__MSG_MAX];
 363         struct usteer_remote_node *rn;
 364         struct sta_info *remote_si;
 365
 366         blobmsg_parse(policy, __MSG_MAX, tb, blobmsg_data(data), blobmsg_data_len(data));
 367         if (tb[MSG_ASSOC] && blobmsg_get_u8(tb[MSG_ASSOC])) {
 368                 if (si->connected == STA_NOT_CONNECTED) {
 369                         /* New connection. Check if STA roamed. */
 370                         for_each_remote_node(rn) {
 371                                 remote_si = usteer_sta_info_get(si->sta, &rn->node, NULL);
 372                                 if (!remote_si)
 373                                         continue;
 374
 375                                 if (current_time - remote_si->last_connected < config.roam_process_timeout) {
 376                                         rn->node.roam_events.source++;
 377                                         /* Don't abort looking for roam sources here.
 378                                          * The client might have roamed via another node
 379                                          * within the roam-timeout.
 380                                          */
 381                                 }
 382                         }
 383                 }
 384                 si->connected = STA_CONNECTED;
 385         }
 386 }
 387
 388 static void
 389 usteer_local_node_update_sta_rrm_wnm(struct sta_info *si, struct blob_attr *client_attr)
 390 {
 391         static const struct blobmsg_policy rrm_policy = {
 392                 .name = "rrm",
 393                 .type = BLOBMSG_TYPE_ARRAY,
 394         };
 395         static const struct blobmsg_policy ext_capa_policy = {
 396                 .name = "extended_capabilities",
 397                 .type = BLOBMSG_TYPE_ARRAY,
 398         };
 399         struct blob_attr *rrm_blob = NULL, *wnm_blob = NULL, *cur;
 400         int rem;
 401         int i = 0;
 402
 403         /* RRM */
 404         blobmsg_parse(&rrm_policy, 1, &rrm_blob, blobmsg_data(client_attr), blobmsg_data_len(client_attr));
 405         if (!rrm_blob)
 406                 return;
 407
 408         si->rrm = blobmsg_get_u32(blobmsg_data(rrm_blob));
 409
 410         /* Extended Capabilities / WNM */
 411         blobmsg_parse(&ext_capa_policy, 1, &wnm_blob, blobmsg_data(client_attr), blobmsg_data_len(client_attr));
 412         if (!wnm_blob)
 413                 return;
 414
 415         blobmsg_for_each_attr(cur, wnm_blob, rem) {
 416                 if (blobmsg_type(cur) != BLOBMSG_TYPE_INT32)
 417                         return;
 418
 419                 if (i == 2) {
 420                         if (blobmsg_get_u32(cur) & (1 << 3))
 421                                 si->bss_transition = true;
 422                 }
 423
 424                 i++;
 425         }
 426 }
 427
 428 static void
 429 usteer_local_node_set_assoc(struct usteer_local_node *ln, struct blob_attr *cl)
 430 {
 431         struct usteer_node *node = &ln->node;
 432         struct usteer_node_handler *h;
 433         struct blob_attr *cur;
 434         struct sta_info *si;
 435         struct sta *sta;
 436         int n_assoc = 0;
 437         int rem;
 438
 439         usteer_update_time();
 440
 441         list_for_each_entry(si, &node->sta_info, node_list) {
 442                 if (si->connected)
 443                         si->connected = STA_DISCONNECTED;
 444         }
 445
 446         blobmsg_for_each_attr(cur, cl, rem) {
 447                 uint8_t *addr = (uint8_t *) ether_aton(blobmsg_name(cur));
 448                 bool create;
 449
 450                 if (!addr)
 451                         continue;
 452
 453                 sta = usteer_sta_get(addr, true);
 454                 si = usteer_sta_info_get(sta, node, &create);
 455                 list_for_each_entry(h, &node_handlers, list) {
 456                         if (!h->update_sta)
 457                                 continue;
 458
 459                         h->update_sta(node, si);
 460                 }
 461                 usteer_local_node_assoc_update(si, cur);
 462                 if (si->connected == STA_CONNECTED) {
 463                         si->last_connected = current_time;
 464                         n_assoc++;
 465                 }
 466
 467                 /* Read RRM information */
 468                 usteer_local_node_update_sta_rrm_wnm(si, cur);
 469         }
 470
 471         node->n_assoc = n_assoc;
 472
 473         list_for_each_entry(si, &node->sta_info, node_list) {
 474                 if (si->connected != STA_DISCONNECTED)
 475                         continue;
 476
 477                 usteer_sta_disconnected(si);
 478                 MSG(VERBOSE, "station "MAC_ADDR_FMT" disconnected from node %s\n",
 479                         MAC_ADDR_DATA(si->sta->addr), usteer_node_name(node));
 480         }
 481 }
 482
 483 static void
 484 usteer_local_node_list_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 485 {
 486         enum {
 487                 MSG_FREQ,
 488                 MSG_CLIENTS,
 489                 __MSG_MAX,
 490         };
 491         static struct blobmsg_policy policy[__MSG_MAX] = {
 492                 [MSG_FREQ] = { "freq", BLOBMSG_TYPE_INT32 },
 493                 [MSG_CLIENTS] = { "clients", BLOBMSG_TYPE_TABLE },
 494         };
 495         struct blob_attr *tb[__MSG_MAX];
 496         struct usteer_local_node *ln;
 497         struct usteer_node *node;
 498
 499         ln = container_of(req, struct usteer_local_node, req);
 500         node = &ln->node;
 501
 502         blobmsg_parse(policy, __MSG_MAX, tb, blob_data(msg), blob_len(msg));
 503         if (!tb[MSG_FREQ] || !tb[MSG_CLIENTS])
 504                 return;
 505
 506         node->freq = blobmsg_get_u32(tb[MSG_FREQ]);
 507         usteer_local_node_set_assoc(ln, tb[MSG_CLIENTS]);
 508 }
 509
 510 static void
 511 usteer_local_node_status_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 512 {
 513         enum {
 514                 MSG_FREQ,
 515                 MSG_CHANNEL,
 516                 MSG_OP_CLASS,
 517                 MSG_BEACON_INTERVAL,
 518                 __MSG_MAX,
 519         };
 520         static struct blobmsg_policy policy[__MSG_MAX] = {
 521                 [MSG_FREQ] = { "freq", BLOBMSG_TYPE_INT32 },
 522                 [MSG_CHANNEL] = { "channel", BLOBMSG_TYPE_INT32 },
 523                 [MSG_OP_CLASS] = { "op_class", BLOBMSG_TYPE_INT32 },
 524                 [MSG_BEACON_INTERVAL] = { "beacon_interval", BLOBMSG_TYPE_INT32 },
 525         };
 526         struct blob_attr *tb[__MSG_MAX];
 527         struct usteer_local_node *ln;
 528         struct usteer_node *node;
 529
 530         ln = container_of(req, struct usteer_local_node, req);
 531         node = &ln->node;
 532
 533         blobmsg_parse(policy, __MSG_MAX, tb, blob_data(msg), blob_len(msg));
 534         if (tb[MSG_FREQ])
 535                 node->freq = blobmsg_get_u32(tb[MSG_FREQ]);
 536         if (tb[MSG_CHANNEL])
 537                 node->channel = blobmsg_get_u32(tb[MSG_CHANNEL]);
 538         if (tb[MSG_OP_CLASS])
 539                 node->op_class = blobmsg_get_u32(tb[MSG_OP_CLASS]);
 540
 541         /* Local-Node */
 542         if (tb[MSG_BEACON_INTERVAL])
 543                 ln->beacon_interval = blobmsg_get_u32(tb[MSG_BEACON_INTERVAL]);
 544 }
 545
 546 static void
 547 usteer_local_node_rrm_nr_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 548 {
 549         static const struct blobmsg_policy policy = {
 550                 "value", BLOBMSG_TYPE_ARRAY
 551         };
 552         struct usteer_local_node *ln;
 553         struct blob_attr *tb;
 554
 555         ln = container_of(req, struct usteer_local_node, req);
 556
 557         blobmsg_parse(&policy, 1, &tb, blob_data(msg), blob_len(msg));
 558         if (!tb)
 559                 return;
 560
 561         usteer_node_set_blob(&ln->node.rrm_nr, tb);
 562 }
 563
 564 static void
 565 usteer_local_node_req_cb(struct ubus_request *req, int ret)
 566 {
 567         struct usteer_local_node *ln;
 568
 569         ln = container_of(req, struct usteer_local_node, req);
 570         uloop_timeout_set(&ln->req_timer, 1);
 571 }
 572
 573 static bool
 574 usteer_add_rrm_data(struct usteer_local_node *ln, struct usteer_node *node)
 575 {
 576         if (node == &ln->node)
 577                 return false;
 578
 579         if (!node->rrm_nr)
 580                 return false;
 581
 582         /* Remote node only adds same SSID. Required for local-node. */
 583         if (strcmp(ln->node.ssid, node->ssid) != 0)
 584                 return false;
 585
 586         blobmsg_add_field(&b, BLOBMSG_TYPE_ARRAY, "",
 587                           blobmsg_data(node->rrm_nr),
 588                           blobmsg_data_len(node->rrm_nr));
 589
 590         return true;
 591 }
 592
 593 static void
 594 usteer_local_node_prepare_rrm_set(struct usteer_local_node *ln)
 595 {
 596         struct usteer_node *node, *last_remote_neighbor = NULL;
 597         int i = 0;
 598         void *c;
 599
 600         c = blobmsg_open_array(&b, "list");
 601         for_each_local_node(node) {
 602                 if (i >= config.max_neighbor_reports)
 603                         break;
 604                 if (usteer_add_rrm_data(ln, node))
 605                         i++;
 606         }
 607
 608         while (i < config.max_neighbor_reports) {
 609                 node = usteer_node_get_next_neighbor(&ln->node, last_remote_neighbor);
 610                 if (!node) {
 611                         /* No more nodes available */
 612                         break;
 613                 }
 614
 615                 last_remote_neighbor = node;
 616                 if (usteer_add_rrm_data(ln, node))
 617                         i++;
 618         }
 619
 620         blobmsg_close_array(&b, c);
 621 }
 622
 623 static void
 624 usteer_local_node_state_next(struct uloop_timeout *timeout)
 625 {
 626         struct usteer_local_node *ln;
 627
 628         ln = container_of(timeout, struct usteer_local_node, req_timer);
 629
 630         ln->req_state++;
 631         if (ln->req_state >= __REQ_MAX) {
 632                 ln->req_state = REQ_IDLE;
 633                 return;
 634         }
 635
 636         blob_buf_init(&b, 0);
 637         switch (ln->req_state) {
 638         case REQ_CLIENTS:
 639                 ubus_invoke_async(ubus_ctx, ln->obj_id, "get_clients", b.head, &ln->req);
 640                 ln->req.data_cb = usteer_local_node_list_cb;
 641                 break;
 642         case REQ_STATUS:
 643                 ubus_invoke_async(ubus_ctx, ln->obj_id, "get_status", b.head, &ln->req);
 644                 ln->req.data_cb = usteer_local_node_status_cb;
 645                 break;
 646         case REQ_RRM_SET_LIST:
 647                 usteer_local_node_prepare_rrm_set(ln);
 648                 ubus_invoke_async(ubus_ctx, ln->obj_id, "rrm_nr_set", b.head, &ln->req);
 649                 ln->req.data_cb = NULL;
 650                 break;
 651         case REQ_RRM_GET_OWN:
 652                 ubus_invoke_async(ubus_ctx, ln->obj_id, "rrm_nr_get_own", b.head, &ln->req);
 653                 ln->req.data_cb = usteer_local_node_rrm_nr_cb;
 654                 break;
 655         default:
 656                 break;
 657         }
 658         ln->req.complete_cb = usteer_local_node_req_cb;
 659         ubus_complete_request_async(ubus_ctx, &ln->req);
 660 }
 661
 662 static void
 663 usteer_local_node_update(struct uloop_timeout *timeout)
 664 {
 665         struct usteer_local_node *ln;
 666         struct usteer_node_handler *h;
 667         struct usteer_node *node;
 668
 669         ln = container_of(timeout, struct usteer_local_node, update);
 670         node = &ln->node;
 671
 672         list_for_each_entry(h, &node_handlers, list) {
 673                 if (!h->update_node)
 674                         continue;
 675
 676                 h->update_node(node);
 677         }
 678
 679         usteer_local_node_state_reset(ln);
 680         uloop_timeout_set(&ln->req_timer, 1);
 681         usteer_local_node_kick(ln);
 682         usteer_band_steering_perform_steer(ln);
 683         uloop_timeout_set(timeout, config.local_sta_update);
 684 }
 685
 686 static void
 687 usteer_local_node_process_bss_tm_queries(struct uloop_timeout *timeout)
 688 {
 689         struct usteer_bss_tm_query *query, *tmp;
 690         struct usteer_local_node *ln;
 691         struct usteer_node *node;
 692         struct sta_info *si;
 693         struct sta *sta;
 694         uint8_t validity_period;
 695
 696         ln = container_of(timeout, struct usteer_local_node, bss_tm_queries_timeout);
 697         node = &ln->node;
 698
 699         validity_period = 10000 / usteer_local_node_get_beacon_interval(ln); /* ~ 10 seconds */
 700
 701         list_for_each_entry_safe(query, tmp, &ln->bss_tm_queries, list) {
 702                 sta = usteer_sta_get(query->sta_addr, false);
 703                 if (!sta)
 704                         continue;
 705
 706                 si = usteer_sta_info_get(sta, node, false);
 707                 if (!si)
 708                         continue;
 709
 710                 usteer_ubus_bss_transition_request(si, query->dialog_token, false, false, validity_period);
 711         }
 712
 713         /* Free pending queries we can not handle */
 714         usteer_local_node_pending_bss_tm_free(ln);
 715 }
 716
 717 static struct usteer_local_node *
 718 usteer_get_node(struct ubus_context *ctx, const char *name)
 719 {
 720         struct usteer_local_node *ln;
 721         struct usteer_node *node;
 722         char *str;
 723
 724         ln = avl_find_element(&local_nodes, name, ln, node.avl);
 725         if (ln)
 726                 return ln;
 727
 728         ln = calloc_a(sizeof(*ln), &str, strlen(name) + 1);
 729         node = &ln->node;
 730         node->type = NODE_TYPE_LOCAL;
 731         node->created = current_time;
 732         node->avl.key = strcpy(str, name);
 733         ln->ev.remove_cb = usteer_handle_remove;
 734         ln->ev.cb = usteer_handle_event;
 735         ln->update.cb = usteer_local_node_update;
 736         ln->req_timer.cb = usteer_local_node_state_next;
 737         ubus_register_subscriber(ctx, &ln->ev);
 738         avl_insert(&local_nodes, &node->avl);
 739         kvlist_init(&ln->node_info, kvlist_blob_len);
 740         INIT_LIST_HEAD(&node->sta_info);
 741         INIT_LIST_HEAD(&node->measurements);
 742
 743         ln->bss_tm_queries_timeout.cb = usteer_local_node_process_bss_tm_queries;
 744         INIT_LIST_HEAD(&ln->bss_tm_queries);
 745         return ln;
 746 }
 747
 748 static void
 749 usteer_node_run_update_script(struct usteer_node *node)
 750 {
 751         struct usteer_local_node *ln = container_of(node, struct usteer_local_node, node);
 752         char *val;
 753
 754         if (!node_up_script)
 755                 return;
 756
 757         val = alloca(strlen(node_up_script) + strlen(ln->iface) + 8);
 758         sprintf(val, "%s '%s'", node_up_script, ln->iface);
 759         if (system(val))
 760                 MSG(INFO, "failed to execute %s\n", val);
 761 }
 762
 763 static void
 764 usteer_check_node_enabled(struct usteer_local_node *ln)
 765 {
 766         bool ssid_disabled = config.ssid_list;
 767         struct blob_attr *cur;
 768         int rem;
 769
 770         blobmsg_for_each_attr(cur, config.ssid_list, rem) {
 771                 if (strcmp(blobmsg_get_string(cur), ln->node.ssid) != 0)
 772                         continue;
 773
 774                 ssid_disabled = false;
 775                 break;
 776         }
 777
 778         if (ln->node.disabled == ssid_disabled)
 779                 return;
 780
 781         ln->node.disabled = ssid_disabled;
 782
 783         if (ssid_disabled) {
 784                 MSG(INFO, "Disconnecting from local node %s\n", usteer_node_name(&ln->node));
 785                 usteer_local_node_state_reset(ln);
 786                 usteer_sta_node_cleanup(&ln->node);
 787                 usteer_measurement_report_node_cleanup(&ln->node);
 788                 uloop_timeout_cancel(&ln->update);
 789                 ubus_unsubscribe(ubus_ctx, &ln->ev, ln->obj_id);
 790                 return;
 791         }
 792
 793         MSG(INFO, "Connecting to local node %s\n", usteer_node_name(&ln->node));
 794         ubus_subscribe(ubus_ctx, &ln->ev, ln->obj_id);
 795         uloop_timeout_set(&ln->update, 1);
 796         usteer_node_run_update_script(&ln->node);
 797 }
 798
 799 static void
 800 usteer_register_node(struct ubus_context *ctx, const char *name, uint32_t id)
 801 {
 802         struct usteer_local_node *ln;
 803         struct usteer_node_handler *h;
 804         const char *iface;
 805         int offset = sizeof("hostapd.") - 1;
 806
 807         iface = name + offset;
 808         if (strncmp(name, "hostapd.", iface - name) != 0)
 809                 return;
 810
 811         MSG(INFO, "Creating local node %s\n", name);
 812         ln = usteer_get_node(ctx, name);
 813         ln->obj_id = id;
 814         ln->iface = usteer_node_name(&ln->node) + offset;
 815         ln->ifindex = if_nametoindex(ln->iface);
 816
 817         blob_buf_init(&b, 0);
 818         blobmsg_add_u32(&b, "notify_response", 1);
 819         ubus_invoke(ctx, id, "notify_response", b.head, NULL, NULL, 1000);
 820
 821         blob_buf_init(&b, 0);
 822         blobmsg_add_u8(&b, "neighbor_report", 1);
 823         blobmsg_add_u8(&b, "link_measurement", 1);
 824         blobmsg_add_u8(&b, "beacon_report", 1);
 825         blobmsg_add_u8(&b, "bss_transition", 1);
 826         ubus_invoke(ctx, id, "bss_mgmt_enable", b.head, NULL, NULL, 1000);
 827
 828         list_for_each_entry(h, &node_handlers, list) {
 829                 if (!h->init_node)
 830                         continue;
 831
 832                 h->init_node(&ln->node);
 833         }
 834
 835         ln->node.disabled = true;
 836         usteer_check_node_enabled(ln);
 837 }
 838
 839 static void
 840 usteer_event_handler(struct ubus_context *ctx, struct ubus_event_handler *ev,
 841                     const char *type, struct blob_attr *msg)
 842 {
 843         static const struct blobmsg_policy policy[2] = {
 844                 { .name = "id", .type = BLOBMSG_TYPE_INT32 },
 845                 { .name = "path", .type = BLOBMSG_TYPE_STRING },
 846         };
 847         struct blob_attr *tb[2];
 848         const char *path;
 849
 850         blobmsg_parse(policy, 2, tb, blob_data(msg), blob_len(msg));
 851
 852         if (!tb[0] || !tb[1])
 853                 return;
 854
 855         path = blobmsg_data(tb[1]);
 856         usteer_register_node(ctx, path, blobmsg_get_u32(tb[0]));
 857 }
 858
 859 static void
 860 usteer_register_events(struct ubus_context *ctx)
 861 {
 862         static struct ubus_event_handler handler = {
 863             .cb = usteer_event_handler
 864         };
 865
 866         ubus_register_event_handler(ctx, &handler, "ubus.object.add");
 867 }
 868
 869 static void
 870 node_list_cb(struct ubus_context *ctx, struct ubus_object_data *obj, void *priv)
 871 {
 872         usteer_register_node(ctx, obj->path, obj->id);
 873 }
 874
 875 int
 876 usteer_local_node_get_beacon_interval(struct usteer_local_node *ln)
 877 {
 878         /* Check if beacon-interval is not available (pre-21.02+) */
 879         if (ln->beacon_interval < 1)
 880                 return 100;
 881
 882         return ln->beacon_interval;
 883 }
 884
 885 void config_set_node_up_script(struct blob_attr *data)
 886 {
 887         const char *val;
 888         struct usteer_node *node;
 889
 890         if (!data)
 891                 return;
 892
 893         val = blobmsg_get_string(data);
 894         if (node_up_script && !strcmp(val, node_up_script))
 895                 return;
 896
 897         free(node_up_script);
 898
 899         if (!strlen(val)) {
 900                 node_up_script = NULL;
 901                 return;
 902         }
 903
 904         node_up_script = strdup(val);
 905
 906         for_each_local_node(node)
 907                 usteer_node_run_update_script(node);
 908 }
 909
 910 void config_get_node_up_script(struct blob_buf *buf)
 911 {
 912         if (!node_up_script)
 913                 return;
 914
 915         blobmsg_add_string(buf, "node_up_script", node_up_script);
 916 }
 917
 918 void config_set_ssid_list(struct blob_attr *data)
 919 {
 920         struct usteer_local_node *ln;
 921
 922         free(config.ssid_list);
 923
 924         if (data && blobmsg_len(data))
 925                 config.ssid_list = blob_memdup(data);
 926         else
 927                 config.ssid_list = NULL;
 928
 929         avl_for_each_element(&local_nodes, ln, node.avl)
 930                 usteer_check_node_enabled(ln);
 931 }
 932
 933 void config_get_ssid_list(struct blob_buf *buf)
 934 {
 935         if (config.ssid_list)
 936                 blobmsg_add_blob(buf, config.ssid_list);
 937 }
 938
 939 void
 940 usteer_local_nodes_init(struct ubus_context *ctx)
 941 {
 942         usteer_register_events(ctx);
 943         ubus_lookup(ctx, "hostapd.*", node_list_cb, NULL);
 944 }