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
 154         blobmsg_parse(policy, __MSG_MAX, tb, blobmsg_data(data), blobmsg_data_len(data));
 155         if (tb[MSG_ASSOC] && blobmsg_get_u8(tb[MSG_ASSOC]))
 156                 si->connected = 1;
 157
 158         if (si->node->freq < 4000)
 159                 si->sta->seen_2ghz = 1;
 160         else
 161                 si->sta->seen_5ghz = 1;
 162 }
 163
 164 static void
 165 usteer_local_node_set_assoc(struct usteer_local_node *ln, struct blob_attr *cl)
 166 {
 167         struct usteer_node *node = &ln->node;
 168         struct usteer_node_handler *h;
 169         struct blob_attr *cur;
 170         struct sta_info *si;
 171         struct sta *sta;
 172         int n_assoc = 0;
 173         int rem;
 174
 175         list_for_each_entry(si, &node->sta_info, node_list) {
 176                 if (si->connected)
 177                         si->connected = 2;
 178         }
 179
 180         blobmsg_for_each_attr(cur, cl, rem) {
 181                 uint8_t *addr = (uint8_t *) ether_aton(blobmsg_name(cur));
 182                 bool create;
 183
 184                 if (!addr)
 185                         continue;
 186
 187                 sta = usteer_sta_get(addr, true);
 188                 si = usteer_sta_info_get(sta, node, &create);
 189                 list_for_each_entry(h, &node_handlers, list) {
 190                         if (!h->update_sta)
 191                                 continue;
 192
 193                         h->update_sta(node, si);
 194                 }
 195                 usteer_local_node_assoc_update(si, cur);
 196                 if (si->connected == 1)
 197                         n_assoc++;
 198         }
 199
 200         node->n_assoc = n_assoc;
 201
 202         list_for_each_entry(si, &node->sta_info, node_list) {
 203                 if (si->connected != 2)
 204                         continue;
 205
 206                 si->connected = 0;
 207                 usteer_sta_info_update_timeout(si, config.local_sta_timeout);
 208                 MSG(VERBOSE, "station "MAC_ADDR_FMT" disconnected from node %s\n",
 209                         MAC_ADDR_DATA(si->sta->addr), usteer_node_name(node));
 210         }
 211 }
 212
 213 static void
 214 usteer_local_node_list_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 215 {
 216         enum {
 217                 MSG_FREQ,
 218                 MSG_CLIENTS,
 219                 __MSG_MAX,
 220         };
 221         static struct blobmsg_policy policy[__MSG_MAX] = {
 222                 [MSG_FREQ] = { "freq", BLOBMSG_TYPE_INT32 },
 223                 [MSG_CLIENTS] = { "clients", BLOBMSG_TYPE_TABLE },
 224         };
 225         struct blob_attr *tb[__MSG_MAX];
 226         struct usteer_local_node *ln;
 227         struct usteer_node *node;
 228
 229         ln = container_of(req, struct usteer_local_node, req);
 230         node = &ln->node;
 231
 232         blobmsg_parse(policy, __MSG_MAX, tb, blob_data(msg), blob_len(msg));
 233         if (!tb[MSG_FREQ] || !tb[MSG_CLIENTS])
 234                 return;
 235
 236         node->freq = blobmsg_get_u32(tb[MSG_FREQ]);
 237         usteer_local_node_set_assoc(ln, tb[MSG_CLIENTS]);
 238 }
 239
 240 static void
 241 usteer_local_node_rrm_nr_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 242 {
 243         static const struct blobmsg_policy policy = {
 244                 "value", BLOBMSG_TYPE_ARRAY
 245         };
 246         struct usteer_local_node *ln;
 247         struct blob_attr *tb;
 248
 249         ln = container_of(req, struct usteer_local_node, req);
 250
 251         blobmsg_parse(&policy, 1, &tb, blob_data(msg), blob_len(msg));
 252         if (!tb)
 253                 return;
 254
 255         usteer_node_set_blob(&ln->node.rrm_nr, tb);
 256 }
 257
 258 static void
 259 usteer_local_node_req_cb(struct ubus_request *req, int ret)
 260 {
 261         struct usteer_local_node *ln;
 262
 263         ln = container_of(req, struct usteer_local_node, req);
 264         uloop_timeout_set(&ln->req_timer, 1);
 265 }
 266
 267 static void
 268 usteer_add_rrm_data(struct usteer_local_node *ln, struct usteer_node *node)
 269 {
 270         if (node == &ln->node)
 271                 return;
 272
 273         if (!node->rrm_nr)
 274                 return;
 275
 276         if (strcmp(ln->node.ssid, node->ssid) != 0)
 277                 return;
 278
 279         blobmsg_add_field(&b, BLOBMSG_TYPE_ARRAY, "",
 280                           blobmsg_data(node->rrm_nr),
 281                           blobmsg_data_len(node->rrm_nr));
 282 }
 283
 284 static void
 285 usteer_local_node_prepare_rrm_set(struct usteer_local_node *ln)
 286 {
 287         struct usteer_remote_node *rn;
 288         struct usteer_node *node;
 289         void *c;
 290
 291         c = blobmsg_open_array(&b, "list");
 292         for_each_local_node(node)
 293                 usteer_add_rrm_data(ln, node);
 294         for_each_remote_node(rn)
 295                 usteer_add_rrm_data(ln, &rn->node);
 296         blobmsg_close_array(&b, c);
 297 }
 298
 299 static void
 300 usteer_local_node_state_next(struct uloop_timeout *timeout)
 301 {
 302         struct usteer_local_node *ln;
 303
 304         ln = container_of(timeout, struct usteer_local_node, req_timer);
 305
 306         ln->req_state++;
 307         if (ln->req_state >= __REQ_MAX) {
 308                 ln->req_state = REQ_IDLE;
 309                 return;
 310         }
 311
 312         blob_buf_init(&b, 0);
 313         switch (ln->req_state) {
 314         case REQ_CLIENTS:
 315                 ubus_invoke_async(ubus_ctx, ln->obj_id, "get_clients", b.head, &ln->req);
 316                 ln->req.data_cb = usteer_local_node_list_cb;
 317                 break;
 318         case REQ_RRM_SET_LIST:
 319                 usteer_local_node_prepare_rrm_set(ln);
 320                 ubus_invoke_async(ubus_ctx, ln->obj_id, "rrm_nr_set", b.head, &ln->req);
 321                 ln->req.data_cb = NULL;
 322                 break;
 323         case REQ_RRM_GET_OWN:
 324                 ubus_invoke_async(ubus_ctx, ln->obj_id, "rrm_nr_get_own", b.head, &ln->req);
 325                 ln->req.data_cb = usteer_local_node_rrm_nr_cb;
 326                 break;
 327         default:
 328                 break;
 329         }
 330         ln->req.complete_cb = usteer_local_node_req_cb;
 331         ubus_complete_request_async(ubus_ctx, &ln->req);
 332 }
 333
 334 static void
 335 usteer_local_node_update(struct uloop_timeout *timeout)
 336 {
 337         struct usteer_local_node *ln;
 338         struct usteer_node_handler *h;
 339         struct usteer_node *node;
 340
 341         ln = container_of(timeout, struct usteer_local_node, update);
 342         node = &ln->node;
 343
 344         list_for_each_entry(h, &node_handlers, list) {
 345                 if (!h->update_node)
 346                         continue;
 347
 348                 h->update_node(node);
 349         }
 350
 351         usteer_local_node_state_reset(ln);
 352         uloop_timeout_set(&ln->req_timer, 1);
 353         usteer_local_node_kick(ln);
 354         uloop_timeout_set(timeout, config.local_sta_update);
 355 }
 356
 357 static struct usteer_local_node *
 358 usteer_get_node(struct ubus_context *ctx, const char *name)
 359 {
 360         struct usteer_local_node *ln;
 361         struct usteer_node *node;
 362         char *str;
 363
 364         ln = avl_find_element(&local_nodes, name, ln, node.avl);
 365         if (ln)
 366                 return ln;
 367
 368         ln = calloc_a(sizeof(*ln), &str, strlen(name) + 1);
 369         node = &ln->node;
 370         node->type = NODE_TYPE_LOCAL;
 371         node->avl.key = strcpy(str, name);
 372         ln->ev.remove_cb = usteer_handle_remove;
 373         ln->ev.cb = usteer_handle_event;
 374         ln->update.cb = usteer_local_node_update;
 375         ln->req_timer.cb = usteer_local_node_state_next;
 376         ubus_register_subscriber(ctx, &ln->ev);
 377         avl_insert(&local_nodes, &node->avl);
 378         kvlist_init(&ln->node_info, kvlist_blob_len);
 379         INIT_LIST_HEAD(&node->sta_info);
 380
 381         return ln;
 382 }
 383
 384 static void
 385 usteer_node_run_update_script(struct usteer_node *node)
 386 {
 387         struct usteer_local_node *ln = container_of(node, struct usteer_local_node, node);
 388         char *val;
 389
 390         if (!node_up_script)
 391                 return;
 392
 393         val = alloca(strlen(node_up_script) + strlen(ln->iface) + 8);
 394         sprintf(val, "%s '%s'", node_up_script, ln->iface);
 395         if (system(val))
 396                 MSG(INFO, "failed to execute %s\n", val);
 397 }
 398
 399 static void
 400 usteer_check_node_enabled(struct usteer_local_node *ln)
 401 {
 402         bool ssid_disabled = config.ssid_list;
 403         struct blob_attr *cur;
 404         int rem;
 405
 406         blobmsg_for_each_attr(cur, config.ssid_list, rem) {
 407                 if (strcmp(blobmsg_get_string(cur), ln->node.ssid) != 0)
 408                         continue;
 409
 410                 ssid_disabled = false;
 411                 break;
 412         }
 413
 414         if (ln->node.disabled == ssid_disabled)
 415                 return;
 416
 417         ln->node.disabled = ssid_disabled;
 418
 419         if (ssid_disabled) {
 420                 MSG(INFO, "Disconnecting from local node %s\n", usteer_node_name(&ln->node));
 421                 usteer_local_node_state_reset(ln);
 422                 usteer_sta_node_cleanup(&ln->node);
 423                 uloop_timeout_cancel(&ln->update);
 424                 ubus_unsubscribe(ubus_ctx, &ln->ev, ln->obj_id);
 425                 return;
 426         }
 427
 428         MSG(INFO, "Connecting to local node %s\n", usteer_node_name(&ln->node));
 429         ubus_subscribe(ubus_ctx, &ln->ev, ln->obj_id);
 430         uloop_timeout_set(&ln->update, 1);
 431         usteer_node_run_update_script(&ln->node);
 432 }
 433
 434 static void
 435 usteer_register_node(struct ubus_context *ctx, const char *name, uint32_t id)
 436 {
 437         struct usteer_local_node *ln;
 438         struct usteer_node_handler *h;
 439         const char *iface;
 440         int offset = sizeof("hostapd.") - 1;
 441
 442         iface = name + offset;
 443         if (strncmp(name, "hostapd.", iface - name) != 0)
 444                 return;
 445
 446         MSG(INFO, "Creating local node %s\n", name);
 447         ln = usteer_get_node(ctx, name);
 448         ln->obj_id = id;
 449         ln->iface = usteer_node_name(&ln->node) + offset;
 450         ln->ifindex = if_nametoindex(ln->iface);
 451
 452         blob_buf_init(&b, 0);
 453         blobmsg_add_u32(&b, "notify_response", 1);
 454         ubus_invoke(ctx, id, "notify_response", b.head, NULL, NULL, 1000);
 455
 456         blob_buf_init(&b, 0);
 457         blobmsg_add_u8(&b, "neighbor_report", 1);
 458         blobmsg_add_u8(&b, "beacon_report", 1);
 459         blobmsg_add_u8(&b, "bss_transition", 1);
 460         ubus_invoke(ctx, id, "bss_mgmt_enable", b.head, NULL, NULL, 1000);
 461
 462         list_for_each_entry(h, &node_handlers, list) {
 463                 if (!h->init_node)
 464                         continue;
 465
 466                 h->init_node(&ln->node);
 467         }
 468
 469         ln->node.disabled = true;
 470         usteer_check_node_enabled(ln);
 471 }
 472
 473 static void
 474 usteer_event_handler(struct ubus_context *ctx, struct ubus_event_handler *ev,
 475                     const char *type, struct blob_attr *msg)
 476 {
 477         static const struct blobmsg_policy policy[2] = {
 478                 { .name = "id", .type = BLOBMSG_TYPE_INT32 },
 479                 { .name = "path", .type = BLOBMSG_TYPE_STRING },
 480         };
 481         struct blob_attr *tb[2];
 482         const char *path;
 483
 484         blobmsg_parse(policy, 2, tb, blob_data(msg), blob_len(msg));
 485
 486         if (!tb[0] || !tb[1])
 487                 return;
 488
 489         path = blobmsg_data(tb[1]);
 490         usteer_register_node(ctx, path, blobmsg_get_u32(tb[0]));
 491 }
 492
 493 static void
 494 usteer_register_events(struct ubus_context *ctx)
 495 {
 496         static struct ubus_event_handler handler = {
 497             .cb = usteer_event_handler
 498         };
 499
 500         ubus_register_event_handler(ctx, &handler, "ubus.object.add");
 501 }
 502
 503 static void
 504 node_list_cb(struct ubus_context *ctx, struct ubus_object_data *obj, void *priv)
 505 {
 506         usteer_register_node(ctx, obj->path, obj->id);
 507 }
 508
 509 void config_set_node_up_script(struct blob_attr *data)
 510 {
 511         const char *val;
 512         struct usteer_node *node;
 513
 514         if (!data)
 515                 return;
 516
 517         val = blobmsg_get_string(data);
 518         if (node_up_script && !strcmp(val, node_up_script))
 519                 return;
 520
 521         free(node_up_script);
 522
 523         if (!strlen(val)) {
 524                 node_up_script = NULL;
 525                 return;
 526         }
 527
 528         node_up_script = strdup(val);
 529
 530         for_each_local_node(node)
 531                 usteer_node_run_update_script(node);
 532 }
 533
 534 void config_get_node_up_script(struct blob_buf *buf)
 535 {
 536         if (!node_up_script)
 537                 return;
 538
 539         blobmsg_add_string(buf, "node_up_script", node_up_script);
 540 }
 541
 542 void config_set_ssid_list(struct blob_attr *data)
 543 {
 544         struct usteer_local_node *ln;
 545
 546         free(config.ssid_list);
 547
 548         if (data && blobmsg_len(data))
 549                 config.ssid_list = blob_memdup(data);
 550         else
 551                 config.ssid_list = NULL;
 552
 553         avl_for_each_element(&local_nodes, ln, node.avl)
 554                 usteer_check_node_enabled(ln);
 555 }
 556
 557 void config_get_ssid_list(struct blob_buf *buf)
 558 {
 559         if (config.ssid_list)
 560                 blobmsg_add_blob(buf, config.ssid_list);
 561 }
 562
 563 void
 564 usteer_local_nodes_init(struct ubus_context *ctx)
 565 {
 566         usteer_register_events(ctx);
 567         ubus_lookup(ctx, "hostapd.*", node_list_cb, NULL);
 568 }