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_events.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
 178 static void
 179 usteer_local_node_update_sta_rrm(const uint8_t *addr, struct blob_attr *client_attr)
 180 {
 181         static const struct blobmsg_policy rrm_policy = {
 182                 .name = "rrm",
 183                 .type = BLOBMSG_TYPE_ARRAY,
 184         };
 185         struct blob_attr *sta_blob = NULL;
 186         struct sta *sta;
 187
 188         if (!addr)
 189                 return;
 190
 191         /* Don't create the STA */
 192         sta = usteer_sta_get(addr, false);
 193         if (!sta)
 194                 return;
 195
 196         blobmsg_parse(&rrm_policy, 1, &sta_blob, blobmsg_data(client_attr), blobmsg_data_len(client_attr));
 197         if (!sta_blob)
 198                 return;
 199
 200         sta->rrm = blobmsg_get_u32(blobmsg_data(sta_blob));
 201 }
 202
 203 static void
 204 usteer_local_node_set_assoc(struct usteer_local_node *ln, struct blob_attr *cl)
 205 {
 206         struct usteer_node *node = &ln->node;
 207         struct usteer_node_handler *h;
 208         struct blob_attr *cur;
 209         struct sta_info *si;
 210         struct sta *sta;
 211         int n_assoc = 0;
 212         int rem;
 213
 214         usteer_update_time();
 215
 216         list_for_each_entry(si, &node->sta_info, node_list) {
 217                 if (si->connected)
 218                         si->connected = STA_DISCONNECTED;
 219         }
 220
 221         blobmsg_for_each_attr(cur, cl, rem) {
 222                 uint8_t *addr = (uint8_t *) ether_aton(blobmsg_name(cur));
 223                 bool create;
 224
 225                 if (!addr)
 226                         continue;
 227
 228                 sta = usteer_sta_get(addr, true);
 229                 si = usteer_sta_info_get(sta, node, &create);
 230                 list_for_each_entry(h, &node_handlers, list) {
 231                         if (!h->update_sta)
 232                                 continue;
 233
 234                         h->update_sta(node, si);
 235                 }
 236                 usteer_local_node_assoc_update(si, cur);
 237                 if (si->connected == STA_CONNECTED) {
 238                         si->last_connected = current_time;
 239                         n_assoc++;
 240                 }
 241
 242                 /* Read RRM information */
 243                 usteer_local_node_update_sta_rrm(addr, cur);
 244         }
 245
 246         node->n_assoc = n_assoc;
 247
 248         list_for_each_entry(si, &node->sta_info, node_list) {
 249                 if (si->connected != STA_DISCONNECTED)
 250                         continue;
 251
 252                 usteer_sta_disconnected(si);
 253                 MSG(VERBOSE, "station "MAC_ADDR_FMT" disconnected from node %s\n",
 254                         MAC_ADDR_DATA(si->sta->addr), usteer_node_name(node));
 255         }
 256 }
 257
 258 static void
 259 usteer_local_node_list_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 260 {
 261         enum {
 262                 MSG_FREQ,
 263                 MSG_CLIENTS,
 264                 __MSG_MAX,
 265         };
 266         static struct blobmsg_policy policy[__MSG_MAX] = {
 267                 [MSG_FREQ] = { "freq", BLOBMSG_TYPE_INT32 },
 268                 [MSG_CLIENTS] = { "clients", BLOBMSG_TYPE_TABLE },
 269         };
 270         struct blob_attr *tb[__MSG_MAX];
 271         struct usteer_local_node *ln;
 272         struct usteer_node *node;
 273
 274         ln = container_of(req, struct usteer_local_node, req);
 275         node = &ln->node;
 276
 277         blobmsg_parse(policy, __MSG_MAX, tb, blob_data(msg), blob_len(msg));
 278         if (!tb[MSG_FREQ] || !tb[MSG_CLIENTS])
 279                 return;
 280
 281         node->freq = blobmsg_get_u32(tb[MSG_FREQ]);
 282         usteer_local_node_set_assoc(ln, tb[MSG_CLIENTS]);
 283 }
 284
 285 static void
 286 usteer_local_node_rrm_nr_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 287 {
 288         static const struct blobmsg_policy policy = {
 289                 "value", BLOBMSG_TYPE_ARRAY
 290         };
 291         struct usteer_local_node *ln;
 292         struct blob_attr *tb;
 293
 294         ln = container_of(req, struct usteer_local_node, req);
 295
 296         blobmsg_parse(&policy, 1, &tb, blob_data(msg), blob_len(msg));
 297         if (!tb)
 298                 return;
 299
 300         usteer_node_set_blob(&ln->node.rrm_nr, tb);
 301 }
 302
 303 static void
 304 usteer_local_node_req_cb(struct ubus_request *req, int ret)
 305 {
 306         struct usteer_local_node *ln;
 307
 308         ln = container_of(req, struct usteer_local_node, req);
 309         uloop_timeout_set(&ln->req_timer, 1);
 310 }
 311
 312 static bool
 313 usteer_add_rrm_data(struct usteer_local_node *ln, struct usteer_node *node)
 314 {
 315         if (node == &ln->node)
 316                 return false;
 317
 318         if (!node->rrm_nr)
 319                 return false;
 320
 321         /* Remote node only adds same SSID. Required for local-node. */
 322         if (strcmp(ln->node.ssid, node->ssid) != 0)
 323                 return false;
 324
 325         blobmsg_add_field(&b, BLOBMSG_TYPE_ARRAY, "",
 326                           blobmsg_data(node->rrm_nr),
 327                           blobmsg_data_len(node->rrm_nr));
 328
 329         return true;
 330 }
 331
 332 static void
 333 usteer_local_node_prepare_rrm_set(struct usteer_local_node *ln)
 334 {
 335         struct usteer_node *node, *last_remote_neighbor = NULL;
 336         int i = 0;
 337         void *c;
 338
 339         c = blobmsg_open_array(&b, "list");
 340         for_each_local_node(node) {
 341                 if (i >= config.max_neighbor_reports)
 342                         break;
 343                 if (usteer_add_rrm_data(ln, node))
 344                         i++;
 345         }
 346
 347         while (i < config.max_neighbor_reports) {
 348                 node = usteer_node_get_next_neighbor(&ln->node, last_remote_neighbor);
 349                 if (!node) {
 350                         /* No more nodes available */
 351                         break;
 352                 }
 353
 354                 last_remote_neighbor = node;
 355                 if (usteer_add_rrm_data(ln, node))
 356                         i++;
 357         }
 358
 359         blobmsg_close_array(&b, c);
 360 }
 361
 362 static void
 363 usteer_local_node_state_next(struct uloop_timeout *timeout)
 364 {
 365         struct usteer_local_node *ln;
 366
 367         ln = container_of(timeout, struct usteer_local_node, req_timer);
 368
 369         ln->req_state++;
 370         if (ln->req_state >= __REQ_MAX) {
 371                 ln->req_state = REQ_IDLE;
 372                 return;
 373         }
 374
 375         blob_buf_init(&b, 0);
 376         switch (ln->req_state) {
 377         case REQ_CLIENTS:
 378                 ubus_invoke_async(ubus_ctx, ln->obj_id, "get_clients", b.head, &ln->req);
 379                 ln->req.data_cb = usteer_local_node_list_cb;
 380                 break;
 381         case REQ_RRM_SET_LIST:
 382                 usteer_local_node_prepare_rrm_set(ln);
 383                 ubus_invoke_async(ubus_ctx, ln->obj_id, "rrm_nr_set", b.head, &ln->req);
 384                 ln->req.data_cb = NULL;
 385                 break;
 386         case REQ_RRM_GET_OWN:
 387                 ubus_invoke_async(ubus_ctx, ln->obj_id, "rrm_nr_get_own", b.head, &ln->req);
 388                 ln->req.data_cb = usteer_local_node_rrm_nr_cb;
 389                 break;
 390         default:
 391                 break;
 392         }
 393         ln->req.complete_cb = usteer_local_node_req_cb;
 394         ubus_complete_request_async(ubus_ctx, &ln->req);
 395 }
 396
 397 static void
 398 usteer_local_node_update(struct uloop_timeout *timeout)
 399 {
 400         struct usteer_local_node *ln;
 401         struct usteer_node_handler *h;
 402         struct usteer_node *node;
 403
 404         ln = container_of(timeout, struct usteer_local_node, update);
 405         node = &ln->node;
 406
 407         list_for_each_entry(h, &node_handlers, list) {
 408                 if (!h->update_node)
 409                         continue;
 410
 411                 h->update_node(node);
 412         }
 413
 414         usteer_local_node_state_reset(ln);
 415         uloop_timeout_set(&ln->req_timer, 1);
 416         usteer_local_node_kick(ln);
 417         uloop_timeout_set(timeout, config.local_sta_update);
 418 }
 419
 420 static struct usteer_local_node *
 421 usteer_get_node(struct ubus_context *ctx, const char *name)
 422 {
 423         struct usteer_local_node *ln;
 424         struct usteer_node *node;
 425         char *str;
 426
 427         ln = avl_find_element(&local_nodes, name, ln, node.avl);
 428         if (ln)
 429                 return ln;
 430
 431         ln = calloc_a(sizeof(*ln), &str, strlen(name) + 1);
 432         node = &ln->node;
 433         node->type = NODE_TYPE_LOCAL;
 434         node->created = current_time;
 435         node->avl.key = strcpy(str, name);
 436         ln->ev.remove_cb = usteer_handle_remove;
 437         ln->ev.cb = usteer_handle_event;
 438         ln->update.cb = usteer_local_node_update;
 439         ln->req_timer.cb = usteer_local_node_state_next;
 440         ubus_register_subscriber(ctx, &ln->ev);
 441         avl_insert(&local_nodes, &node->avl);
 442         kvlist_init(&ln->node_info, kvlist_blob_len);
 443         INIT_LIST_HEAD(&node->sta_info);
 444
 445         return ln;
 446 }
 447
 448 static void
 449 usteer_node_run_update_script(struct usteer_node *node)
 450 {
 451         struct usteer_local_node *ln = container_of(node, struct usteer_local_node, node);
 452         char *val;
 453
 454         if (!node_up_script)
 455                 return;
 456
 457         val = alloca(strlen(node_up_script) + strlen(ln->iface) + 8);
 458         sprintf(val, "%s '%s'", node_up_script, ln->iface);
 459         if (system(val))
 460                 MSG(INFO, "failed to execute %s\n", val);
 461 }
 462
 463 static void
 464 usteer_check_node_enabled(struct usteer_local_node *ln)
 465 {
 466         bool ssid_disabled = config.ssid_list;
 467         struct blob_attr *cur;
 468         int rem;
 469
 470         blobmsg_for_each_attr(cur, config.ssid_list, rem) {
 471                 if (strcmp(blobmsg_get_string(cur), ln->node.ssid) != 0)
 472                         continue;
 473
 474                 ssid_disabled = false;
 475                 break;
 476         }
 477
 478         if (ln->node.disabled == ssid_disabled)
 479                 return;
 480
 481         ln->node.disabled = ssid_disabled;
 482
 483         if (ssid_disabled) {
 484                 MSG(INFO, "Disconnecting from local node %s\n", usteer_node_name(&ln->node));
 485                 usteer_local_node_state_reset(ln);
 486                 usteer_sta_node_cleanup(&ln->node);
 487                 uloop_timeout_cancel(&ln->update);
 488                 ubus_unsubscribe(ubus_ctx, &ln->ev, ln->obj_id);
 489                 return;
 490         }
 491
 492         MSG(INFO, "Connecting to local node %s\n", usteer_node_name(&ln->node));
 493         ubus_subscribe(ubus_ctx, &ln->ev, ln->obj_id);
 494         uloop_timeout_set(&ln->update, 1);
 495         usteer_node_run_update_script(&ln->node);
 496 }
 497
 498 static void
 499 usteer_register_node(struct ubus_context *ctx, const char *name, uint32_t id)
 500 {
 501         struct usteer_local_node *ln;
 502         struct usteer_node_handler *h;
 503         const char *iface;
 504         int offset = sizeof("hostapd.") - 1;
 505
 506         iface = name + offset;
 507         if (strncmp(name, "hostapd.", iface - name) != 0)
 508                 return;
 509
 510         MSG(INFO, "Creating local node %s\n", name);
 511         ln = usteer_get_node(ctx, name);
 512         ln->obj_id = id;
 513         ln->iface = usteer_node_name(&ln->node) + offset;
 514         ln->ifindex = if_nametoindex(ln->iface);
 515
 516         blob_buf_init(&b, 0);
 517         blobmsg_add_u32(&b, "notify_response", 1);
 518         ubus_invoke(ctx, id, "notify_response", b.head, NULL, NULL, 1000);
 519
 520         blob_buf_init(&b, 0);
 521         blobmsg_add_u8(&b, "neighbor_report", 1);
 522         blobmsg_add_u8(&b, "beacon_report", 1);
 523         blobmsg_add_u8(&b, "bss_transition", 1);
 524         ubus_invoke(ctx, id, "bss_mgmt_enable", b.head, NULL, NULL, 1000);
 525
 526         list_for_each_entry(h, &node_handlers, list) {
 527                 if (!h->init_node)
 528                         continue;
 529
 530                 h->init_node(&ln->node);
 531         }
 532
 533         ln->node.disabled = true;
 534         usteer_check_node_enabled(ln);
 535 }
 536
 537 static void
 538 usteer_event_handler(struct ubus_context *ctx, struct ubus_event_handler *ev,
 539                     const char *type, struct blob_attr *msg)
 540 {
 541         static const struct blobmsg_policy policy[2] = {
 542                 { .name = "id", .type = BLOBMSG_TYPE_INT32 },
 543                 { .name = "path", .type = BLOBMSG_TYPE_STRING },
 544         };
 545         struct blob_attr *tb[2];
 546         const char *path;
 547
 548         blobmsg_parse(policy, 2, tb, blob_data(msg), blob_len(msg));
 549
 550         if (!tb[0] || !tb[1])
 551                 return;
 552
 553         path = blobmsg_data(tb[1]);
 554         usteer_register_node(ctx, path, blobmsg_get_u32(tb[0]));
 555 }
 556
 557 static void
 558 usteer_register_events(struct ubus_context *ctx)
 559 {
 560         static struct ubus_event_handler handler = {
 561             .cb = usteer_event_handler
 562         };
 563
 564         ubus_register_event_handler(ctx, &handler, "ubus.object.add");
 565 }
 566
 567 static void
 568 node_list_cb(struct ubus_context *ctx, struct ubus_object_data *obj, void *priv)
 569 {
 570         usteer_register_node(ctx, obj->path, obj->id);
 571 }
 572
 573 void config_set_node_up_script(struct blob_attr *data)
 574 {
 575         const char *val;
 576         struct usteer_node *node;
 577
 578         if (!data)
 579                 return;
 580
 581         val = blobmsg_get_string(data);
 582         if (node_up_script && !strcmp(val, node_up_script))
 583                 return;
 584
 585         free(node_up_script);
 586
 587         if (!strlen(val)) {
 588                 node_up_script = NULL;
 589                 return;
 590         }
 591
 592         node_up_script = strdup(val);
 593
 594         for_each_local_node(node)
 595                 usteer_node_run_update_script(node);
 596 }
 597
 598 void config_get_node_up_script(struct blob_buf *buf)
 599 {
 600         if (!node_up_script)
 601                 return;
 602
 603         blobmsg_add_string(buf, "node_up_script", node_up_script);
 604 }
 605
 606 void config_set_ssid_list(struct blob_attr *data)
 607 {
 608         struct usteer_local_node *ln;
 609
 610         free(config.ssid_list);
 611
 612         if (data && blobmsg_len(data))
 613                 config.ssid_list = blob_memdup(data);
 614         else
 615                 config.ssid_list = NULL;
 616
 617         avl_for_each_element(&local_nodes, ln, node.avl)
 618                 usteer_check_node_enabled(ln);
 619 }
 620
 621 void config_get_ssid_list(struct blob_buf *buf)
 622 {
 623         if (config.ssid_list)
 624                 blobmsg_add_blob(buf, config.ssid_list);
 625 }
 626
 627 void
 628 usteer_local_nodes_init(struct ubus_context *ctx)
 629 {
 630         usteer_register_events(ctx);
 631         ubus_lookup(ctx, "hostapd.*", node_list_cb, NULL);
 632 }