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