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_free_node(struct ubus_context *ctx, struct usteer_local_node *ln)
  51 {
  52         struct usteer_node_handler *h;
  53
  54         list_for_each_entry(h, &node_handlers, list) {
  55                 if (!h->free_node)
  56                         continue;
  57                 h->free_node(&ln->node);
  58         }
  59
  60         usteer_local_node_state_reset(ln);
  61         usteer_sta_node_cleanup(&ln->node);
  62         uloop_timeout_cancel(&ln->update);
  63         avl_delete(&local_nodes, &ln->node.avl);
  64         ubus_unregister_subscriber(ctx, &ln->ev);
  65         kvlist_free(&ln->node_info);
  66         free(ln);
  67 }
  68
  69 static void
  70 usteer_handle_remove(struct ubus_context *ctx, struct ubus_subscriber *s,
  71                     uint32_t id)
  72 {
  73         struct usteer_local_node *ln = container_of(s, struct usteer_local_node, ev);
  74
  75         usteer_free_node(ctx, ln);
  76 }
  77
  78 static int
  79 usteer_handle_event(struct ubus_context *ctx, struct ubus_object *obj,
  80                    struct ubus_request_data *req, const char *method,
  81                    struct blob_attr *msg)
  82 {
  83         enum {
  84                 EVENT_ADDR,
  85                 EVENT_SIGNAL,
  86                 EVENT_TARGET,
  87                 EVENT_FREQ,
  88                 __EVENT_MAX
  89         };
  90         struct blobmsg_policy policy[__EVENT_MAX] = {
  91                 [EVENT_ADDR] = { .name = "address", .type = BLOBMSG_TYPE_STRING },
  92                 [EVENT_SIGNAL] = { .name = "signal", .type = BLOBMSG_TYPE_INT32 },
  93                 [EVENT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
  94                 [EVENT_FREQ] = { .name = "freq", .type = BLOBMSG_TYPE_INT32 },
  95         };
  96         enum usteer_event_type ev_type = __EVENT_TYPE_MAX;
  97         struct blob_attr *tb[__EVENT_MAX];
  98         struct usteer_local_node *ln;
  99         struct usteer_node *node;
 100         int signal = NO_SIGNAL;
 101         int freq = 0;
 102         const char *addr_str;
 103         const uint8_t *addr;
 104         int i;
 105         bool ret;
 106
 107         usteer_update_time();
 108
 109         for (i = 0; i < ARRAY_SIZE(event_types); i++) {
 110                 if (strcmp(method, event_types[i]) != 0)
 111                         continue;
 112
 113                 ev_type = i;
 114                 break;
 115         }
 116
 117         ln = container_of(obj, struct usteer_local_node, ev.obj);
 118         node = &ln->node;
 119         blobmsg_parse(policy, __EVENT_MAX, tb, blob_data(msg), blob_len(msg));
 120         if (!tb[EVENT_ADDR] || !tb[EVENT_FREQ])
 121                 return UBUS_STATUS_INVALID_ARGUMENT;
 122
 123         if (tb[EVENT_SIGNAL])
 124                 signal = (int32_t) blobmsg_get_u32(tb[EVENT_SIGNAL]);
 125
 126         if (tb[EVENT_FREQ])
 127                 freq = blobmsg_get_u32(tb[EVENT_FREQ]);
 128
 129         addr_str = blobmsg_data(tb[EVENT_ADDR]);
 130         addr = (uint8_t *) ether_aton(addr_str);
 131         if (!addr)
 132                 return UBUS_STATUS_INVALID_ARGUMENT;
 133
 134         ret = usteer_handle_sta_event(node, addr, ev_type, freq, signal);
 135
 136         MSG(DEBUG, "received %s event from %s, signal=%d, freq=%d, handled:%s\n",
 137             method, addr_str, signal, freq, ret ? "true" : "false");
 138
 139         return ret ? 0 : 17 /* WLAN_STATUS_AP_UNABLE_TO_HANDLE_NEW_STA */;
 140 }
 141
 142 static void
 143 usteer_local_node_assoc_update(struct sta_info *si, struct blob_attr *data)
 144 {
 145         enum {
 146                 MSG_ASSOC,
 147                 __MSG_MAX,
 148         };
 149         static struct blobmsg_policy policy[__MSG_MAX] = {
 150                 [MSG_ASSOC] = { "assoc", BLOBMSG_TYPE_BOOL },
 151         };
 152         struct blob_attr *tb[__MSG_MAX];
 153         struct usteer_remote_node *rn;
 154         struct sta_info *remote_si;
 155
 156         blobmsg_parse(policy, __MSG_MAX, tb, blobmsg_data(data), blobmsg_data_len(data));
 157         if (tb[MSG_ASSOC] && blobmsg_get_u8(tb[MSG_ASSOC])) {
 158                 if (si->connected == STA_NOT_CONNECTED) {
 159                         /* New connection. Check if STA roamed. */
 160                         for_each_remote_node(rn) {
 161                                 remote_si = usteer_sta_info_get(si->sta, &rn->node, NULL);
 162                                 if (!remote_si)
 163                                         continue;
 164
 165                                 if (current_time - remote_si->last_connected < config.roam_process_timeout) {
 166                                         rn->node.roam_source++;
 167                                         /* Don't abort looking for roam sources here.
 168                                          * The client might have roamed via another node
 169                                          * within the roam-timeout.
 170                                          */
 171                                 }
 172                         }
 173                 }
 174                 si->connected = STA_CONNECTED;
 175         }
 176
 177         if (si->node->freq < 4000)
 178                 si->sta->seen_2ghz = 1;
 179         else
 180                 si->sta->seen_5ghz = 1;
 181 }
 182
 183 static void
 184 usteer_local_node_set_assoc(struct usteer_local_node *ln, struct blob_attr *cl)
 185 {
 186         struct usteer_node *node = &ln->node;
 187         struct usteer_node_handler *h;
 188         struct blob_attr *cur;
 189         struct sta_info *si;
 190         struct sta *sta;
 191         int n_assoc = 0;
 192         int rem;
 193
 194         usteer_update_time();
 195
 196         list_for_each_entry(si, &node->sta_info, node_list) {
 197                 if (si->connected)
 198                         si->connected = STA_DISCONNECTED;
 199         }
 200
 201         blobmsg_for_each_attr(cur, cl, rem) {
 202                 uint8_t *addr = (uint8_t *) ether_aton(blobmsg_name(cur));
 203                 bool create;
 204
 205                 if (!addr)
 206                         continue;
 207
 208                 sta = usteer_sta_get(addr, true);
 209                 si = usteer_sta_info_get(sta, node, &create);
 210                 list_for_each_entry(h, &node_handlers, list) {
 211                         if (!h->update_sta)
 212                                 continue;
 213
 214                         h->update_sta(node, si);
 215                 }
 216                 usteer_local_node_assoc_update(si, cur);
 217                 if (si->connected == STA_CONNECTED) {
 218                         si->last_connected = current_time;
 219                         n_assoc++;
 220                 }
 221         }
 222
 223         node->n_assoc = n_assoc;
 224
 225         list_for_each_entry(si, &node->sta_info, node_list) {
 226                 if (si->connected != STA_DISCONNECTED)
 227                         continue;
 228
 229                 si->connected = STA_NOT_CONNECTED;
 230                 usteer_sta_info_update_timeout(si, config.local_sta_timeout);
 231                 MSG(VERBOSE, "station "MAC_ADDR_FMT" disconnected from node %s\n",
 232                         MAC_ADDR_DATA(si->sta->addr), usteer_node_name(node));
 233         }
 234 }
 235
 236 static void
 237 usteer_local_node_list_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 238 {
 239         enum {
 240                 MSG_FREQ,
 241                 MSG_CLIENTS,
 242                 __MSG_MAX,
 243         };
 244         static struct blobmsg_policy policy[__MSG_MAX] = {
 245                 [MSG_FREQ] = { "freq", BLOBMSG_TYPE_INT32 },
 246                 [MSG_CLIENTS] = { "clients", BLOBMSG_TYPE_TABLE },
 247         };
 248         struct blob_attr *tb[__MSG_MAX];
 249         struct usteer_local_node *ln;
 250         struct usteer_node *node;
 251
 252         ln = container_of(req, struct usteer_local_node, req);
 253         node = &ln->node;
 254
 255         blobmsg_parse(policy, __MSG_MAX, tb, blob_data(msg), blob_len(msg));
 256         if (!tb[MSG_FREQ] || !tb[MSG_CLIENTS])
 257                 return;
 258
 259         node->freq = blobmsg_get_u32(tb[MSG_FREQ]);
 260         usteer_local_node_set_assoc(ln, tb[MSG_CLIENTS]);
 261 }
 262
 263 static void
 264 usteer_local_node_rrm_nr_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 265 {
 266         static const struct blobmsg_policy policy = {
 267                 "value", BLOBMSG_TYPE_ARRAY
 268         };
 269         struct usteer_local_node *ln;
 270         struct blob_attr *tb;
 271
 272         ln = container_of(req, struct usteer_local_node, req);
 273
 274         blobmsg_parse(&policy, 1, &tb, blob_data(msg), blob_len(msg));
 275         if (!tb)
 276                 return;
 277
 278         usteer_node_set_blob(&ln->node.rrm_nr, tb);
 279 }
 280
 281 static void
 282 usteer_local_node_req_cb(struct ubus_request *req, int ret)
 283 {
 284         struct usteer_local_node *ln;
 285
 286         ln = container_of(req, struct usteer_local_node, req);
 287         uloop_timeout_set(&ln->req_timer, 1);
 288 }
 289
 290 static bool
 291 usteer_add_rrm_data(struct usteer_local_node *ln, struct usteer_node *node)
 292 {
 293         if (node == &ln->node)
 294                 return false;
 295
 296         if (!node->rrm_nr)
 297                 return false;
 298
 299         /* Remote node only adds same SSID. Required for local-node. */
 300         if (strcmp(ln->node.ssid, node->ssid) != 0)
 301                 return false;
 302
 303         blobmsg_add_field(&b, BLOBMSG_TYPE_ARRAY, "",
 304                           blobmsg_data(node->rrm_nr),
 305                           blobmsg_data_len(node->rrm_nr));
 306
 307         return true;
 308 }
 309
 310 static void
 311 usteer_local_node_prepare_rrm_set(struct usteer_local_node *ln)
 312 {
 313         struct usteer_node *node, *last_remote_neighbor = NULL;
 314         int i = 0;
 315         void *c;
 316
 317         c = blobmsg_open_array(&b, "list");
 318         for_each_local_node(node) {
 319                 if (i >= config.max_neighbor_reports)
 320                         break;
 321                 if (usteer_add_rrm_data(ln, node))
 322                         i++;
 323         }
 324
 325         while (i < config.max_neighbor_reports) {
 326                 node = usteer_node_get_next_neighbor(&ln->node, last_remote_neighbor);
 327                 if (!node) {
 328                         /* No more nodes available */
 329                         break;
 330                 }
 331
 332                 last_remote_neighbor = node;
 333                 if (usteer_add_rrm_data(ln, node))
 334                         i++;
 335         }
 336
 337         blobmsg_close_array(&b, c);
 338 }
 339
 340 static void
 341 usteer_local_node_state_next(struct uloop_timeout *timeout)
 342 {
 343         struct usteer_local_node *ln;
 344
 345         ln = container_of(timeout, struct usteer_local_node, req_timer);
 346
 347         ln->req_state++;
 348         if (ln->req_state >= __REQ_MAX) {
 349                 ln->req_state = REQ_IDLE;
 350                 return;
 351         }
 352
 353         blob_buf_init(&b, 0);
 354         switch (ln->req_state) {
 355         case REQ_CLIENTS:
 356                 ubus_invoke_async(ubus_ctx, ln->obj_id, "get_clients", b.head, &ln->req);
 357                 ln->req.data_cb = usteer_local_node_list_cb;
 358                 break;
 359         case REQ_RRM_SET_LIST:
 360                 usteer_local_node_prepare_rrm_set(ln);
 361                 ubus_invoke_async(ubus_ctx, ln->obj_id, "rrm_nr_set", b.head, &ln->req);
 362                 ln->req.data_cb = NULL;
 363                 break;
 364         case REQ_RRM_GET_OWN:
 365                 ubus_invoke_async(ubus_ctx, ln->obj_id, "rrm_nr_get_own", b.head, &ln->req);
 366                 ln->req.data_cb = usteer_local_node_rrm_nr_cb;
 367                 break;
 368         default:
 369                 break;
 370         }
 371         ln->req.complete_cb = usteer_local_node_req_cb;
 372         ubus_complete_request_async(ubus_ctx, &ln->req);
 373 }
 374
 375 static void
 376 usteer_local_node_update(struct uloop_timeout *timeout)
 377 {
 378         struct usteer_local_node *ln;
 379         struct usteer_node_handler *h;
 380         struct usteer_node *node;
 381
 382         ln = container_of(timeout, struct usteer_local_node, update);
 383         node = &ln->node;
 384
 385         list_for_each_entry(h, &node_handlers, list) {
 386                 if (!h->update_node)
 387                         continue;
 388
 389                 h->update_node(node);
 390         }
 391
 392         usteer_local_node_state_reset(ln);
 393         uloop_timeout_set(&ln->req_timer, 1);
 394         usteer_local_node_kick(ln);
 395         uloop_timeout_set(timeout, config.local_sta_update);
 396 }
 397
 398 static struct usteer_local_node *
 399 usteer_get_node(struct ubus_context *ctx, const char *name)
 400 {
 401         struct usteer_local_node *ln;
 402         struct usteer_node *node;
 403         char *str;
 404
 405         ln = avl_find_element(&local_nodes, name, ln, node.avl);
 406         if (ln)
 407                 return ln;
 408
 409         ln = calloc_a(sizeof(*ln), &str, strlen(name) + 1);
 410         node = &ln->node;
 411         node->type = NODE_TYPE_LOCAL;
 412         node->avl.key = strcpy(str, name);
 413         ln->ev.remove_cb = usteer_handle_remove;
 414         ln->ev.cb = usteer_handle_event;
 415         ln->update.cb = usteer_local_node_update;
 416         ln->req_timer.cb = usteer_local_node_state_next;
 417         ubus_register_subscriber(ctx, &ln->ev);
 418         avl_insert(&local_nodes, &node->avl);
 419         kvlist_init(&ln->node_info, kvlist_blob_len);
 420         INIT_LIST_HEAD(&node->sta_info);
 421
 422         return ln;
 423 }
 424
 425 static void
 426 usteer_node_run_update_script(struct usteer_node *node)
 427 {
 428         struct usteer_local_node *ln = container_of(node, struct usteer_local_node, node);
 429         char *val;
 430
 431         if (!node_up_script)
 432                 return;
 433
 434         val = alloca(strlen(node_up_script) + strlen(ln->iface) + 8);
 435         sprintf(val, "%s '%s'", node_up_script, ln->iface);
 436         if (system(val))
 437                 MSG(INFO, "failed to execute %s\n", val);
 438 }
 439
 440 static void
 441 usteer_check_node_enabled(struct usteer_local_node *ln)
 442 {
 443         bool ssid_disabled = config.ssid_list;
 444         struct blob_attr *cur;
 445         int rem;
 446
 447         blobmsg_for_each_attr(cur, config.ssid_list, rem) {
 448                 if (strcmp(blobmsg_get_string(cur), ln->node.ssid) != 0)
 449                         continue;
 450
 451                 ssid_disabled = false;
 452                 break;
 453         }
 454
 455         if (ln->node.disabled == ssid_disabled)
 456                 return;
 457
 458         ln->node.disabled = ssid_disabled;
 459
 460         if (ssid_disabled) {
 461                 MSG(INFO, "Disconnecting from local node %s\n", usteer_node_name(&ln->node));
 462                 usteer_local_node_state_reset(ln);
 463                 usteer_sta_node_cleanup(&ln->node);
 464                 uloop_timeout_cancel(&ln->update);
 465                 ubus_unsubscribe(ubus_ctx, &ln->ev, ln->obj_id);
 466                 return;
 467         }
 468
 469         MSG(INFO, "Connecting to local node %s\n", usteer_node_name(&ln->node));
 470         ubus_subscribe(ubus_ctx, &ln->ev, ln->obj_id);
 471         uloop_timeout_set(&ln->update, 1);
 472         usteer_node_run_update_script(&ln->node);
 473 }
 474
 475 static void
 476 usteer_register_node(struct ubus_context *ctx, const char *name, uint32_t id)
 477 {
 478         struct usteer_local_node *ln;
 479         struct usteer_node_handler *h;
 480         const char *iface;
 481         int offset = sizeof("hostapd.") - 1;
 482
 483         iface = name + offset;
 484         if (strncmp(name, "hostapd.", iface - name) != 0)
 485                 return;
 486
 487         MSG(INFO, "Creating local node %s\n", name);
 488         ln = usteer_get_node(ctx, name);
 489         ln->obj_id = id;
 490         ln->iface = usteer_node_name(&ln->node) + offset;
 491         ln->ifindex = if_nametoindex(ln->iface);
 492
 493         blob_buf_init(&b, 0);
 494         blobmsg_add_u32(&b, "notify_response", 1);
 495         ubus_invoke(ctx, id, "notify_response", b.head, NULL, NULL, 1000);
 496
 497         blob_buf_init(&b, 0);
 498         blobmsg_add_u8(&b, "neighbor_report", 1);
 499         blobmsg_add_u8(&b, "beacon_report", 1);
 500         blobmsg_add_u8(&b, "bss_transition", 1);
 501         ubus_invoke(ctx, id, "bss_mgmt_enable", b.head, NULL, NULL, 1000);
 502
 503         list_for_each_entry(h, &node_handlers, list) {
 504                 if (!h->init_node)
 505                         continue;
 506
 507                 h->init_node(&ln->node);
 508         }
 509
 510         ln->node.disabled = true;
 511         usteer_check_node_enabled(ln);
 512 }
 513
 514 static void
 515 usteer_event_handler(struct ubus_context *ctx, struct ubus_event_handler *ev,
 516                     const char *type, struct blob_attr *msg)
 517 {
 518         static const struct blobmsg_policy policy[2] = {
 519                 { .name = "id", .type = BLOBMSG_TYPE_INT32 },
 520                 { .name = "path", .type = BLOBMSG_TYPE_STRING },
 521         };
 522         struct blob_attr *tb[2];
 523         const char *path;
 524
 525         blobmsg_parse(policy, 2, tb, blob_data(msg), blob_len(msg));
 526
 527         if (!tb[0] || !tb[1])
 528                 return;
 529
 530         path = blobmsg_data(tb[1]);
 531         usteer_register_node(ctx, path, blobmsg_get_u32(tb[0]));
 532 }
 533
 534 static void
 535 usteer_register_events(struct ubus_context *ctx)
 536 {
 537         static struct ubus_event_handler handler = {
 538             .cb = usteer_event_handler
 539         };
 540
 541         ubus_register_event_handler(ctx, &handler, "ubus.object.add");
 542 }
 543
 544 static void
 545 node_list_cb(struct ubus_context *ctx, struct ubus_object_data *obj, void *priv)
 546 {
 547         usteer_register_node(ctx, obj->path, obj->id);
 548 }
 549
 550 void config_set_node_up_script(struct blob_attr *data)
 551 {
 552         const char *val;
 553         struct usteer_node *node;
 554
 555         if (!data)
 556                 return;
 557
 558         val = blobmsg_get_string(data);
 559         if (node_up_script && !strcmp(val, node_up_script))
 560                 return;
 561
 562         free(node_up_script);
 563
 564         if (!strlen(val)) {
 565                 node_up_script = NULL;
 566                 return;
 567         }
 568
 569         node_up_script = strdup(val);
 570
 571         for_each_local_node(node)
 572                 usteer_node_run_update_script(node);
 573 }
 574
 575 void config_get_node_up_script(struct blob_buf *buf)
 576 {
 577         if (!node_up_script)
 578                 return;
 579
 580         blobmsg_add_string(buf, "node_up_script", node_up_script);
 581 }
 582
 583 void config_set_ssid_list(struct blob_attr *data)
 584 {
 585         struct usteer_local_node *ln;
 586
 587         free(config.ssid_list);
 588
 589         if (data && blobmsg_len(data))
 590                 config.ssid_list = blob_memdup(data);
 591         else
 592                 config.ssid_list = NULL;
 593
 594         avl_for_each_element(&local_nodes, ln, node.avl)
 595                 usteer_check_node_enabled(ln);
 596 }
 597
 598 void config_get_ssid_list(struct blob_buf *buf)
 599 {
 600         if (config.ssid_list)
 601                 blobmsg_add_blob(buf, config.ssid_list);
 602 }
 603
 604 void
 605 usteer_local_nodes_init(struct ubus_context *ctx)
 606 {
 607         usteer_register_events(ctx);
 608         ubus_lookup(ctx, "hostapd.*", node_list_cb, NULL);
 609 }