wpa_supplicant/mesh.c

   1 /*
   2  * WPA Supplicant - Basic mesh mode routines
   3  * Copyright (c) 2013-2014, cozybit, Inc.  All rights reserved.
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "utils/includes.h"
  10
  11 #include "utils/common.h"
  12 #include "utils/eloop.h"
  13 #include "utils/uuid.h"
  14 #include "common/ieee802_11_defs.h"
  15 #include "common/wpa_ctrl.h"
  16 #include "ap/sta_info.h"
  17 #include "ap/hostapd.h"
  18 #include "ap/ieee802_11.h"
  19 #include "config_ssid.h"
  20 #include "config.h"
  21 #include "wpa_supplicant_i.h"
  22 #include "driver_i.h"
  23 #include "notify.h"
  24 #include "ap.h"
  25 #include "mesh_mpm.h"
  26 #include "mesh_rsn.h"
  27 #include "mesh.h"
  28
  29
  30 static void wpa_supplicant_mesh_deinit(struct wpa_supplicant *wpa_s)
  31 {
  32         wpa_supplicant_mesh_iface_deinit(wpa_s, wpa_s->ifmsh);
  33         wpa_s->ifmsh = NULL;
  34         wpa_s->current_ssid = NULL;
  35         os_free(wpa_s->mesh_rsn);
  36         wpa_s->mesh_rsn = NULL;
  37         /* TODO: leave mesh (stop beacon). This will happen on link down
  38          * anyway, so it's not urgent */
  39 }
  40
  41
  42 void wpa_supplicant_mesh_iface_deinit(struct wpa_supplicant *wpa_s,
  43                                       struct hostapd_iface *ifmsh)
  44 {
  45         if (!ifmsh)
  46                 return;
  47
  48         if (ifmsh->mconf) {
  49                 mesh_mpm_deinit(wpa_s, ifmsh);
  50                 if (ifmsh->mconf->ies) {
  51                         ifmsh->mconf->ies = NULL;
  52                         /* We cannot free this struct
  53                          * because wpa_authenticator on
  54                          * hostapd side is also using it
  55                          * for now just set to NULL and
  56                          * let hostapd code free it.
  57                          */
  58                 }
  59                 os_free(ifmsh->mconf);
  60                 ifmsh->mconf = NULL;
  61         }
  62
  63         /* take care of shared data */
  64         hostapd_interface_deinit(ifmsh);
  65         hostapd_interface_free(ifmsh);
  66 }
  67
  68
  69 static struct mesh_conf * mesh_config_create(struct wpa_ssid *ssid)
  70 {
  71         struct mesh_conf *conf;
  72
  73         conf = os_zalloc(sizeof(struct mesh_conf));
  74         if (!conf)
  75                 return NULL;
  76
  77         os_memcpy(conf->meshid, ssid->ssid, ssid->ssid_len);
  78         conf->meshid_len = ssid->ssid_len;
  79
  80         if (ssid->key_mgmt & WPA_KEY_MGMT_SAE)
  81                 conf->security |= MESH_CONF_SEC_AUTH |
  82                         MESH_CONF_SEC_AMPE;
  83         else
  84                 conf->security |= MESH_CONF_SEC_NONE;
  85
  86         /* defaults */
  87         conf->mesh_pp_id = MESH_PATH_PROTOCOL_HWMP;
  88         conf->mesh_pm_id = MESH_PATH_METRIC_AIRTIME;
  89         conf->mesh_cc_id = 0;
  90         conf->mesh_sp_id = MESH_SYNC_METHOD_NEIGHBOR_OFFSET;
  91         conf->mesh_auth_id = (conf->security & MESH_CONF_SEC_AUTH) ? 1 : 0;
  92         conf->dot11MeshMaxRetries = ssid->dot11MeshMaxRetries;
  93         conf->dot11MeshRetryTimeout = ssid->dot11MeshRetryTimeout;
  94         conf->dot11MeshConfirmTimeout = ssid->dot11MeshConfirmTimeout;
  95         conf->dot11MeshHoldingTimeout = ssid->dot11MeshHoldingTimeout;
  96
  97         return conf;
  98 }
  99
 100
 101 static void wpas_mesh_copy_groups(struct hostapd_data *bss,
 102                                   struct wpa_supplicant *wpa_s)
 103 {
 104         int num_groups;
 105         size_t groups_size;
 106
 107         for (num_groups = 0; wpa_s->conf->sae_groups[num_groups] > 0;
 108              num_groups++)
 109                 ;
 110
 111         groups_size = (num_groups + 1) * sizeof(wpa_s->conf->sae_groups[0]);
 112         bss->conf->sae_groups = os_malloc(groups_size);
 113         if (bss->conf->sae_groups)
 114                 os_memcpy(bss->conf->sae_groups, wpa_s->conf->sae_groups,
 115                           groups_size);
 116 }
 117
 118
 119 static int wpa_supplicant_mesh_init(struct wpa_supplicant *wpa_s,
 120                                     struct wpa_ssid *ssid)
 121 {
 122         struct hostapd_iface *ifmsh;
 123         struct hostapd_data *bss;
 124         struct hostapd_config *conf;
 125         struct mesh_conf *mconf;
 126         int basic_rates_erp[] = { 10, 20, 55, 60, 110, 120, 240, -1 };
 127         static int default_groups[] = { 19, 20, 21, 25, 26, -1 };
 128         size_t len;
 129         int rate_len;
 130
 131         if (!wpa_s->conf->user_mpm) {
 132                 /* not much for us to do here */
 133                 wpa_msg(wpa_s, MSG_WARNING,
 134                         "user_mpm is not enabled in configuration");
 135                 return 0;
 136         }
 137
 138         wpa_s->ifmsh = ifmsh = os_zalloc(sizeof(*wpa_s->ifmsh));
 139         if (!ifmsh)
 140                 return -ENOMEM;
 141
 142         ifmsh->drv_flags = wpa_s->drv_flags;
 143         ifmsh->num_bss = 1;
 144         ifmsh->bss = os_calloc(wpa_s->ifmsh->num_bss,
 145                                sizeof(struct hostapd_data *));
 146         if (!ifmsh->bss)
 147                 goto out_free;
 148
 149         ifmsh->bss[0] = bss = os_zalloc(sizeof(struct hostapd_data));
 150         if (!bss)
 151                 goto out_free;
 152
 153         os_memcpy(bss->own_addr, wpa_s->own_addr, ETH_ALEN);
 154         bss->driver = wpa_s->driver;
 155         bss->drv_priv = wpa_s->drv_priv;
 156         bss->iface = ifmsh;
 157         bss->mesh_sta_free_cb = mesh_mpm_free_sta;
 158         wpa_s->assoc_freq = ssid->frequency;
 159         wpa_s->current_ssid = ssid;
 160
 161         /* setup an AP config for auth processing */
 162         conf = hostapd_config_defaults();
 163         if (!conf)
 164                 goto out_free;
 165
 166         bss->conf = *conf->bss;
 167         bss->conf->start_disabled = 1;
 168         bss->conf->mesh = MESH_ENABLED;
 169         bss->iconf = conf;
 170         ifmsh->conf = conf;
 171
 172         ifmsh->bss[0]->max_plinks = wpa_s->conf->max_peer_links;
 173         os_strlcpy(bss->conf->iface, wpa_s->ifname, sizeof(bss->conf->iface));
 174
 175         mconf = mesh_config_create(ssid);
 176         if (!mconf)
 177                 goto out_free;
 178         ifmsh->mconf = mconf;
 179
 180         /* need conf->hw_mode for supported rates. */
 181         if (ssid->frequency == 0) {
 182                 conf->hw_mode = HOSTAPD_MODE_IEEE80211G;
 183                 conf->channel = 1;
 184         } else {
 185                 conf->hw_mode = ieee80211_freq_to_chan(ssid->frequency,
 186                                                        &conf->channel);
 187         }
 188         if (conf->hw_mode == NUM_HOSTAPD_MODES) {
 189                 wpa_printf(MSG_ERROR, "Unsupported mesh mode frequency: %d MHz",
 190                            ssid->frequency);
 191                 goto out_free;
 192         }
 193
 194         if (ssid->mesh_basic_rates == NULL) {
 195                 /*
 196                  * XXX: Hack! This is so an MPM which correctly sets the ERP
 197                  * mandatory rates as BSSBasicRateSet doesn't reject us. We
 198                  * could add a new hw_mode HOSTAPD_MODE_IEEE80211G_ERP, but
 199                  * this is way easier. This also makes our BSSBasicRateSet
 200                  * advertised in beacons match the one in peering frames, sigh.
 201                  */
 202                 if (conf->hw_mode == HOSTAPD_MODE_IEEE80211G) {
 203                         conf->basic_rates = os_malloc(sizeof(basic_rates_erp));
 204                         if (!conf->basic_rates)
 205                                 goto out_free;
 206                         os_memcpy(conf->basic_rates, basic_rates_erp,
 207                                   sizeof(basic_rates_erp));
 208                 }
 209         } else {
 210                 rate_len = 0;
 211                 while (1) {
 212                         if (ssid->mesh_basic_rates[rate_len] < 1)
 213                                 break;
 214                         rate_len++;
 215                 }
 216                 conf->basic_rates = os_calloc(rate_len + 1, sizeof(int));
 217                 if (conf->basic_rates == NULL)
 218                         goto out_free;
 219                 os_memcpy(conf->basic_rates, ssid->mesh_basic_rates,
 220                           rate_len * sizeof(int));
 221                 conf->basic_rates[rate_len] = -1;
 222         }
 223
 224         if (hostapd_setup_interface(ifmsh)) {
 225                 wpa_printf(MSG_ERROR,
 226                            "Failed to initialize hostapd interface for mesh");
 227                 return -1;
 228         }
 229
 230         if (wpa_drv_init_mesh(wpa_s)) {
 231                 wpa_msg(wpa_s, MSG_ERROR, "Failed to init mesh in driver");
 232                 return -1;
 233         }
 234
 235         if (mconf->security != MESH_CONF_SEC_NONE) {
 236                 if (ssid->passphrase == NULL) {
 237                         wpa_printf(MSG_ERROR,
 238                                    "mesh: Passphrase for SAE not configured");
 239                         goto out_free;
 240                 }
 241
 242                 bss->conf->wpa = ssid->proto;
 243                 bss->conf->wpa_key_mgmt = ssid->key_mgmt;
 244
 245                 if (wpa_s->conf->sae_groups &&
 246                     wpa_s->conf->sae_groups[0] > 0) {
 247                         wpas_mesh_copy_groups(bss, wpa_s);
 248                 } else {
 249                         bss->conf->sae_groups =
 250                                 os_malloc(sizeof(default_groups));
 251                         if (!bss->conf->sae_groups)
 252                                 goto out_free;
 253                         os_memcpy(bss->conf->sae_groups, default_groups,
 254                                   sizeof(default_groups));
 255                 }
 256
 257                 len = os_strlen(ssid->passphrase);
 258                 bss->conf->ssid.wpa_passphrase =
 259                         dup_binstr(ssid->passphrase, len);
 260
 261                 wpa_s->mesh_rsn = mesh_rsn_auth_init(wpa_s, mconf);
 262                 if (!wpa_s->mesh_rsn)
 263                         goto out_free;
 264         }
 265
 266         wpa_supplicant_conf_ap_ht(wpa_s, ssid, conf);
 267
 268         return 0;
 269 out_free:
 270         wpa_supplicant_mesh_deinit(wpa_s);
 271         return -ENOMEM;
 272 }
 273
 274
 275 void wpa_mesh_notify_peer(struct wpa_supplicant *wpa_s, const u8 *addr,
 276                           const u8 *ies, size_t ie_len)
 277 {
 278         struct ieee802_11_elems elems;
 279
 280         wpa_msg(wpa_s, MSG_INFO,
 281                 "new peer notification for " MACSTR, MAC2STR(addr));
 282
 283         if (ieee802_11_parse_elems(ies, ie_len, &elems, 0) == ParseFailed) {
 284                 wpa_msg(wpa_s, MSG_INFO, "Could not parse beacon from " MACSTR,
 285                         MAC2STR(addr));
 286                 return;
 287         }
 288         wpa_mesh_new_mesh_peer(wpa_s, addr, &elems);
 289 }
 290
 291
 292 void wpa_supplicant_mesh_add_scan_ie(struct wpa_supplicant *wpa_s,
 293                                      struct wpabuf **extra_ie)
 294 {
 295         /* EID + 0-length (wildcard) mesh-id */
 296         size_t ielen = 2;
 297
 298         if (wpabuf_resize(extra_ie, ielen) == 0) {
 299                 wpabuf_put_u8(*extra_ie, WLAN_EID_MESH_ID);
 300                 wpabuf_put_u8(*extra_ie, 0);
 301         }
 302 }
 303
 304
 305 int wpa_supplicant_join_mesh(struct wpa_supplicant *wpa_s,
 306                              struct wpa_ssid *ssid)
 307 {
 308         struct wpa_driver_mesh_join_params params;
 309         int ret = 0;
 310
 311         if (!ssid || !ssid->ssid || !ssid->ssid_len || !ssid->frequency) {
 312                 ret = -ENOENT;
 313                 goto out;
 314         }
 315
 316         wpa_supplicant_mesh_deinit(wpa_s);
 317
 318         os_memset(&params, 0, sizeof(params));
 319         params.meshid = ssid->ssid;
 320         params.meshid_len = ssid->ssid_len;
 321         params.freq = ssid->frequency;
 322         if (ssid->beacon_int > 0)
 323                 params.beacon_int = ssid->beacon_int;
 324         else if (wpa_s->conf->beacon_int > 0)
 325                 params.beacon_int = wpa_s->conf->beacon_int;
 326         params.max_peer_links = wpa_s->conf->max_peer_links;
 327 #ifdef CONFIG_IEEE80211N
 328         params.ht_mode = ssid->mesh_ht_mode;
 329 #endif /* CONFIG_IEEE80211N */
 330
 331         if (ssid->key_mgmt & WPA_KEY_MGMT_SAE) {
 332                 params.flags |= WPA_DRIVER_MESH_FLAG_SAE_AUTH;
 333                 params.flags |= WPA_DRIVER_MESH_FLAG_AMPE;
 334                 wpa_s->conf->user_mpm = 1;
 335         }
 336
 337         if (wpa_s->conf->user_mpm) {
 338                 params.flags |= WPA_DRIVER_MESH_FLAG_USER_MPM;
 339                 params.conf.flags &= ~WPA_DRIVER_MESH_CONF_FLAG_AUTO_PLINKS;
 340         } else {
 341                 params.flags |= WPA_DRIVER_MESH_FLAG_DRIVER_MPM;
 342                 params.conf.flags |= WPA_DRIVER_MESH_CONF_FLAG_AUTO_PLINKS;
 343         }
 344
 345         if (wpa_supplicant_mesh_init(wpa_s, ssid)) {
 346                 wpa_msg(wpa_s, MSG_ERROR, "Failed to init mesh");
 347                 ret = -1;
 348                 goto out;
 349         }
 350
 351         if (wpa_s->ifmsh) {
 352                 params.ies = wpa_s->ifmsh->mconf->ies;
 353                 params.ie_len = wpa_s->ifmsh->mconf->ie_len;
 354                 params.basic_rates = wpa_s->ifmsh->basic_rates;
 355         }
 356
 357         wpa_msg(wpa_s, MSG_INFO, "joining mesh %s",
 358                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 359         ret = wpa_drv_join_mesh(wpa_s, &params);
 360         if (ret)
 361                 wpa_msg(wpa_s, MSG_ERROR, "mesh join error=%d\n", ret);
 362
 363         /* hostapd sets the interface down until we associate */
 364         wpa_drv_set_operstate(wpa_s, 1);
 365
 366 out:
 367         return ret;
 368 }
 369
 370
 371 int wpa_supplicant_leave_mesh(struct wpa_supplicant *wpa_s)
 372 {
 373         int ret = 0;
 374
 375         wpa_msg(wpa_s, MSG_INFO, "leaving mesh");
 376
 377         /* Need to send peering close messages first */
 378         wpa_supplicant_mesh_deinit(wpa_s);
 379
 380         ret = wpa_drv_leave_mesh(wpa_s);
 381         if (ret)
 382                 wpa_msg(wpa_s, MSG_ERROR, "mesh leave error=%d", ret);
 383
 384         wpa_drv_set_operstate(wpa_s, 1);
 385
 386         return ret;
 387 }
 388
 389
 390 static int mesh_attr_text(const u8 *ies, size_t ies_len, char *buf, char *end)
 391 {
 392         struct ieee802_11_elems elems;
 393         char *mesh_id, *pos = buf;
 394         u8 *bss_basic_rate_set;
 395         int bss_basic_rate_set_len, ret, i;
 396
 397         if (ieee802_11_parse_elems(ies, ies_len, &elems, 0) == ParseFailed)
 398                 return -1;
 399
 400         if (elems.mesh_id_len < 1)
 401                 return 0;
 402
 403         mesh_id = os_malloc(elems.mesh_id_len + 1);
 404         if (mesh_id == NULL)
 405                 return -1;
 406
 407         os_memcpy(mesh_id, elems.mesh_id, elems.mesh_id_len);
 408         mesh_id[elems.mesh_id_len] = '\0';
 409         ret = os_snprintf(pos, end - pos, "mesh_id=%s\n", mesh_id);
 410         os_free(mesh_id);
 411         if (os_snprintf_error(end - pos, ret))
 412                 return pos - buf;
 413         pos += ret;
 414
 415         if (elems.mesh_config_len > 6) {
 416                 ret = os_snprintf(pos, end - pos,
 417                                   "active_path_selection_protocol_id=0x%02x\n"
 418                                   "active_path_selection_metric_id=0x%02x\n"
 419                                   "congestion_control_mode_id=0x%02x\n"
 420                                   "synchronization_method_id=0x%02x\n"
 421                                   "authentication_protocol_id=0x%02x\n"
 422                                   "mesh_formation_info=0x%02x\n"
 423                                   "mesh_capability=0x%02x\n",
 424                                   elems.mesh_config[0], elems.mesh_config[1],
 425                                   elems.mesh_config[2], elems.mesh_config[3],
 426                                   elems.mesh_config[4], elems.mesh_config[5],
 427                                   elems.mesh_config[6]);
 428                 if (os_snprintf_error(end - pos, ret))
 429                         return pos - buf;
 430                 pos += ret;
 431         }
 432
 433         bss_basic_rate_set = os_malloc(elems.supp_rates_len +
 434                 elems.ext_supp_rates_len);
 435         if (bss_basic_rate_set == NULL)
 436                 return -1;
 437
 438         bss_basic_rate_set_len = 0;
 439         for (i = 0; i < elems.supp_rates_len; i++) {
 440                 if (elems.supp_rates[i] & 0x80) {
 441                         bss_basic_rate_set[bss_basic_rate_set_len++] =
 442                                 (elems.supp_rates[i] & 0x7f) * 5;
 443                 }
 444         }
 445         for (i = 0; i < elems.ext_supp_rates_len; i++) {
 446                 if (elems.ext_supp_rates[i] & 0x80) {
 447                         bss_basic_rate_set[bss_basic_rate_set_len++] =
 448                                 (elems.ext_supp_rates[i] & 0x7f) * 5;
 449                 }
 450         }
 451         if (bss_basic_rate_set_len > 0) {
 452                 ret = os_snprintf(pos, end - pos, "bss_basic_rate_set=%d",
 453                                   bss_basic_rate_set[0]);
 454                 if (os_snprintf_error(end - pos, ret))
 455                         return pos - buf;
 456                 pos += ret;
 457
 458                 for (i = 1; i < bss_basic_rate_set_len; i++) {
 459                         ret = os_snprintf(pos, end - pos, " %d",
 460                                           bss_basic_rate_set[i]);
 461                         if (os_snprintf_error(end - pos, ret))
 462                                 return pos - buf;
 463                         pos += ret;
 464                 }
 465
 466                 ret = os_snprintf(pos, end - pos, "\n");
 467                 if (os_snprintf_error(end - pos, ret))
 468                         return pos - buf;
 469                 pos += ret;
 470         }
 471         os_free(bss_basic_rate_set);
 472
 473         return pos - buf;
 474 }
 475
 476
 477 int wpas_mesh_scan_result_text(const u8 *ies, size_t ies_len, char *buf,
 478                                char *end)
 479 {
 480         return mesh_attr_text(ies, ies_len, buf, end);
 481 }
 482
 483
 484 static int wpas_mesh_get_ifname(struct wpa_supplicant *wpa_s, char *ifname,
 485                                 size_t len)
 486 {
 487         char *ifname_ptr = wpa_s->ifname;
 488         int res;
 489
 490         res = os_snprintf(ifname, len, "mesh-%s-%d", ifname_ptr,
 491                           wpa_s->mesh_if_idx);
 492         if (os_snprintf_error(len, res) ||
 493             (os_strlen(ifname) >= IFNAMSIZ &&
 494              os_strlen(wpa_s->ifname) < IFNAMSIZ)) {
 495                 /* Try to avoid going over the IFNAMSIZ length limit */
 496                 res = os_snprintf(ifname, len, "mesh-%d", wpa_s->mesh_if_idx);
 497                 if (os_snprintf_error(len, res))
 498                         return -1;
 499         }
 500         wpa_s->mesh_if_idx++;
 501         return 0;
 502 }
 503
 504
 505 int wpas_mesh_add_interface(struct wpa_supplicant *wpa_s, char *ifname,
 506                             size_t len)
 507 {
 508         struct wpa_interface iface;
 509         struct wpa_supplicant *mesh_wpa_s;
 510         u8 addr[ETH_ALEN];
 511
 512         if (ifname[0] == '\0' && wpas_mesh_get_ifname(wpa_s, ifname, len) < 0)
 513                 return -1;
 514
 515         if (wpa_drv_if_add(wpa_s, WPA_IF_MESH, ifname, NULL, NULL, NULL, addr,
 516                            NULL) < 0) {
 517                 wpa_printf(MSG_ERROR,
 518                            "mesh: Failed to create new mesh interface");
 519                 return -1;
 520         }
 521         wpa_printf(MSG_INFO, "mesh: Created virtual interface %s addr "
 522                    MACSTR, ifname, MAC2STR(addr));
 523
 524         os_memset(&iface, 0, sizeof(iface));
 525         iface.ifname = ifname;
 526         iface.driver = wpa_s->driver->name;
 527         iface.driver_param = wpa_s->conf->driver_param;
 528         iface.ctrl_interface = wpa_s->conf->ctrl_interface;
 529
 530         mesh_wpa_s = wpa_supplicant_add_iface(wpa_s->global, &iface);
 531         if (!mesh_wpa_s) {
 532                 wpa_printf(MSG_ERROR,
 533                            "mesh: Failed to create new wpa_supplicant interface");
 534                 wpa_supplicant_remove_iface(wpa_s->global, wpa_s, 0);
 535                 return -1;
 536         }
 537         mesh_wpa_s->mesh_if_created = 1;
 538         mesh_wpa_s->parent = wpa_s;
 539         return 0;
 540 }