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
  93         return conf;
  94 }
  95
  96
  97 static void wpas_mesh_copy_groups(struct hostapd_data *bss,
  98                                   struct wpa_supplicant *wpa_s)
  99 {
 100         int num_groups;
 101         size_t groups_size;
 102
 103         for (num_groups = 0; wpa_s->conf->sae_groups[num_groups] > 0;
 104              num_groups++)
 105                 ;
 106
 107         groups_size = (num_groups + 1) * sizeof(wpa_s->conf->sae_groups[0]);
 108         bss->conf->sae_groups = os_malloc(groups_size);
 109         if (bss->conf->sae_groups)
 110                 os_memcpy(bss->conf->sae_groups, wpa_s->conf->sae_groups,
 111                           groups_size);
 112 }
 113
 114
 115 static int wpa_supplicant_mesh_init(struct wpa_supplicant *wpa_s,
 116                                     struct wpa_ssid *ssid)
 117 {
 118         struct hostapd_iface *ifmsh;
 119         struct hostapd_data *bss;
 120         struct hostapd_config *conf;
 121         struct mesh_conf *mconf;
 122         int basic_rates_erp[] = { 10, 20, 55, 60, 110, 120, 240, -1 };
 123         static int default_groups[] = { 19, 20, 21, 25, 26, -1 };
 124         size_t len;
 125         int rate_len;
 126
 127         if (!wpa_s->conf->user_mpm) {
 128                 /* not much for us to do here */
 129                 wpa_msg(wpa_s, MSG_WARNING,
 130                         "user_mpm is not enabled in configuration");
 131                 return 0;
 132         }
 133
 134         wpa_s->ifmsh = ifmsh = os_zalloc(sizeof(*wpa_s->ifmsh));
 135         if (!ifmsh)
 136                 return -ENOMEM;
 137
 138         ifmsh->drv_flags = wpa_s->drv_flags;
 139         ifmsh->num_bss = 1;
 140         ifmsh->bss = os_calloc(wpa_s->ifmsh->num_bss,
 141                                sizeof(struct hostapd_data *));
 142         if (!ifmsh->bss)
 143                 goto out_free;
 144
 145         ifmsh->bss[0] = bss = os_zalloc(sizeof(struct hostapd_data));
 146         if (!bss)
 147                 goto out_free;
 148
 149         os_memcpy(bss->own_addr, wpa_s->own_addr, ETH_ALEN);
 150         bss->driver = wpa_s->driver;
 151         bss->drv_priv = wpa_s->drv_priv;
 152         bss->iface = ifmsh;
 153         bss->mesh_sta_free_cb = mesh_mpm_free_sta;
 154         wpa_s->assoc_freq = ssid->frequency;
 155         wpa_s->current_ssid = ssid;
 156
 157         /* setup an AP config for auth processing */
 158         conf = hostapd_config_defaults();
 159         if (!conf)
 160                 goto out_free;
 161
 162         bss->conf = *conf->bss;
 163         bss->conf->start_disabled = 1;
 164         bss->conf->mesh = MESH_ENABLED;
 165         bss->iconf = conf;
 166         ifmsh->conf = conf;
 167
 168         ifmsh->bss[0]->max_plinks = 99;
 169         os_strlcpy(bss->conf->iface, wpa_s->ifname, sizeof(bss->conf->iface));
 170
 171         mconf = mesh_config_create(ssid);
 172         if (!mconf)
 173                 goto out_free;
 174         ifmsh->mconf = mconf;
 175
 176         /* need conf->hw_mode for supported rates. */
 177         if (ssid->frequency == 0) {
 178                 conf->hw_mode = HOSTAPD_MODE_IEEE80211G;
 179                 conf->channel = 1;
 180         } else {
 181                 conf->hw_mode = ieee80211_freq_to_chan(ssid->frequency,
 182                                                        &conf->channel);
 183         }
 184         if (conf->hw_mode == NUM_HOSTAPD_MODES) {
 185                 wpa_printf(MSG_ERROR, "Unsupported mesh mode frequency: %d MHz",
 186                            ssid->frequency);
 187                 goto out_free;
 188         }
 189
 190         if (ssid->mesh_basic_rates == NULL) {
 191                 /*
 192                  * XXX: Hack! This is so an MPM which correctly sets the ERP
 193                  * mandatory rates as BSSBasicRateSet doesn't reject us. We
 194                  * could add a new hw_mode HOSTAPD_MODE_IEEE80211G_ERP, but
 195                  * this is way easier. This also makes our BSSBasicRateSet
 196                  * advertised in beacons match the one in peering frames, sigh.
 197                  */
 198                 if (conf->hw_mode == HOSTAPD_MODE_IEEE80211G) {
 199                         conf->basic_rates = os_malloc(sizeof(basic_rates_erp));
 200                         if (!conf->basic_rates)
 201                                 goto out_free;
 202                         os_memcpy(conf->basic_rates, basic_rates_erp,
 203                                   sizeof(basic_rates_erp));
 204                 }
 205         } else {
 206                 rate_len = 0;
 207                 while (1) {
 208                         if (ssid->mesh_basic_rates[rate_len] < 1)
 209                                 break;
 210                         rate_len++;
 211                 }
 212                 conf->basic_rates = os_calloc(rate_len + 1, sizeof(int));
 213                 if (conf->basic_rates == NULL)
 214                         goto out_free;
 215                 os_memcpy(conf->basic_rates, ssid->mesh_basic_rates,
 216                           rate_len * sizeof(int));
 217                 conf->basic_rates[rate_len] = -1;
 218         }
 219
 220         if (hostapd_setup_interface(ifmsh)) {
 221                 wpa_printf(MSG_ERROR,
 222                            "Failed to initialize hostapd interface for mesh");
 223                 return -1;
 224         }
 225
 226         if (wpa_drv_init_mesh(wpa_s)) {
 227                 wpa_msg(wpa_s, MSG_ERROR, "Failed to init mesh in driver");
 228                 return -1;
 229         }
 230
 231         if (mconf->security != MESH_CONF_SEC_NONE) {
 232                 if (ssid->passphrase == NULL) {
 233                         wpa_printf(MSG_ERROR,
 234                                    "mesh: Passphrase for SAE not configured");
 235                         goto out_free;
 236                 }
 237
 238                 bss->conf->wpa = ssid->proto;
 239                 bss->conf->wpa_key_mgmt = ssid->key_mgmt;
 240
 241                 if (wpa_s->conf->sae_groups &&
 242                     wpa_s->conf->sae_groups[0] > 0) {
 243                         wpas_mesh_copy_groups(bss, wpa_s);
 244                 } else {
 245                         bss->conf->sae_groups =
 246                                 os_malloc(sizeof(default_groups));
 247                         if (!bss->conf->sae_groups)
 248                                 goto out_free;
 249                         os_memcpy(bss->conf->sae_groups, default_groups,
 250                                   sizeof(default_groups));
 251                 }
 252
 253                 len = os_strlen(ssid->passphrase);
 254                 bss->conf->ssid.wpa_passphrase =
 255                         dup_binstr(ssid->passphrase, len);
 256
 257                 wpa_s->mesh_rsn = mesh_rsn_auth_init(wpa_s, mconf);
 258                 if (!wpa_s->mesh_rsn)
 259                         goto out_free;
 260         }
 261
 262         wpa_supplicant_conf_ap_ht(wpa_s, ssid, conf);
 263
 264         return 0;
 265 out_free:
 266         wpa_supplicant_mesh_deinit(wpa_s);
 267         return -ENOMEM;
 268 }
 269
 270
 271 void wpa_mesh_notify_peer(struct wpa_supplicant *wpa_s, const u8 *addr,
 272                           const u8 *ies, size_t ie_len)
 273 {
 274         struct ieee802_11_elems elems;
 275
 276         wpa_msg(wpa_s, MSG_INFO,
 277                 "new peer notification for " MACSTR, MAC2STR(addr));
 278
 279         if (ieee802_11_parse_elems(ies, ie_len, &elems, 0) == ParseFailed) {
 280                 wpa_msg(wpa_s, MSG_INFO, "Could not parse beacon from " MACSTR,
 281                         MAC2STR(addr));
 282                 return;
 283         }
 284         wpa_mesh_new_mesh_peer(wpa_s, addr, &elems);
 285 }
 286
 287
 288 void wpa_supplicant_mesh_add_scan_ie(struct wpa_supplicant *wpa_s,
 289                                      struct wpabuf **extra_ie)
 290 {
 291         /* EID + 0-length (wildcard) mesh-id */
 292         size_t ielen = 2;
 293
 294         if (wpabuf_resize(extra_ie, ielen) == 0) {
 295                 wpabuf_put_u8(*extra_ie, WLAN_EID_MESH_ID);
 296                 wpabuf_put_u8(*extra_ie, 0);
 297         }
 298 }
 299
 300
 301 int wpa_supplicant_join_mesh(struct wpa_supplicant *wpa_s,
 302                              struct wpa_ssid *ssid)
 303 {
 304         struct wpa_driver_mesh_join_params params;
 305         int ret = 0;
 306
 307         if (!ssid || !ssid->ssid || !ssid->ssid_len || !ssid->frequency) {
 308                 ret = -ENOENT;
 309                 goto out;
 310         }
 311
 312         wpa_supplicant_mesh_deinit(wpa_s);
 313
 314         os_memset(&params, 0, sizeof(params));
 315         params.meshid = ssid->ssid;
 316         params.meshid_len = ssid->ssid_len;
 317         params.freq = ssid->frequency;
 318 #ifdef CONFIG_IEEE80211N
 319         params.ht_mode = ssid->mesh_ht_mode;
 320 #endif /* CONFIG_IEEE80211N */
 321
 322         if (ssid->key_mgmt & WPA_KEY_MGMT_SAE) {
 323                 params.flags |= WPA_DRIVER_MESH_FLAG_SAE_AUTH;
 324                 params.flags |= WPA_DRIVER_MESH_FLAG_AMPE;
 325                 wpa_s->conf->user_mpm = 1;
 326         }
 327
 328         if (wpa_s->conf->user_mpm) {
 329                 params.flags |= WPA_DRIVER_MESH_FLAG_USER_MPM;
 330                 params.conf.flags &= ~WPA_DRIVER_MESH_CONF_FLAG_AUTO_PLINKS;
 331         } else {
 332                 params.flags |= WPA_DRIVER_MESH_FLAG_DRIVER_MPM;
 333                 params.conf.flags |= WPA_DRIVER_MESH_CONF_FLAG_AUTO_PLINKS;
 334         }
 335
 336         if (wpa_supplicant_mesh_init(wpa_s, ssid)) {
 337                 wpa_msg(wpa_s, MSG_ERROR, "Failed to init mesh");
 338                 ret = -1;
 339                 goto out;
 340         }
 341
 342         if (wpa_s->ifmsh) {
 343                 params.ies = wpa_s->ifmsh->mconf->ies;
 344                 params.ie_len = wpa_s->ifmsh->mconf->ie_len;
 345                 params.basic_rates = wpa_s->ifmsh->basic_rates;
 346         }
 347
 348         wpa_msg(wpa_s, MSG_INFO, "joining mesh %s",
 349                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 350         ret = wpa_drv_join_mesh(wpa_s, &params);
 351         if (ret)
 352                 wpa_msg(wpa_s, MSG_ERROR, "mesh join error=%d\n", ret);
 353
 354         /* hostapd sets the interface down until we associate */
 355         wpa_drv_set_operstate(wpa_s, 1);
 356
 357 out:
 358         return ret;
 359 }
 360
 361
 362 int wpa_supplicant_leave_mesh(struct wpa_supplicant *wpa_s)
 363 {
 364         int ret = 0;
 365
 366         wpa_msg(wpa_s, MSG_INFO, "leaving mesh");
 367
 368         ret = wpa_drv_leave_mesh(wpa_s);
 369         if (ret)
 370                 wpa_msg(wpa_s, MSG_ERROR, "mesh leave error=%d", ret);
 371
 372         wpa_drv_set_operstate(wpa_s, 1);
 373
 374         wpa_supplicant_mesh_deinit(wpa_s);
 375
 376         return ret;
 377 }
 378
 379
 380 static int mesh_attr_text(const u8 *ies, size_t ies_len, char *buf, char *end)
 381 {
 382         struct ieee802_11_elems elems;
 383         char *mesh_id, *pos = buf;
 384         u8 *bss_basic_rate_set;
 385         int bss_basic_rate_set_len, ret, i;
 386
 387         if (ieee802_11_parse_elems(ies, ies_len, &elems, 0) == ParseFailed)
 388                 return -1;
 389
 390         if (elems.mesh_id_len < 1)
 391                 return 0;
 392
 393         mesh_id = os_malloc(elems.mesh_id_len + 1);
 394         if (mesh_id == NULL)
 395                 return -1;
 396
 397         os_memcpy(mesh_id, elems.mesh_id, elems.mesh_id_len);
 398         mesh_id[elems.mesh_id_len] = '\0';
 399         ret = os_snprintf(pos, end - pos, "mesh_id=%s\n", mesh_id);
 400         os_free(mesh_id);
 401         if (ret < 0 || ret >= end - pos)
 402                 return pos - buf;
 403         pos += ret;
 404
 405         if (elems.mesh_config_len > 6) {
 406                 ret = os_snprintf(pos, end - pos,
 407                                   "active_path_selection_protocol_id=0x%02x\n"
 408                                   "active_path_selection_metric_id=0x%02x\n"
 409                                   "congestion_control_mode_id=0x%02x\n"
 410                                   "synchronization_method_id=0x%02x\n"
 411                                   "authentication_protocol_id=0x%02x\n"
 412                                   "mesh_formation_info=0x%02x\n"
 413                                   "mesh_capability=0x%02x\n",
 414                                   elems.mesh_config[0], elems.mesh_config[1],
 415                                   elems.mesh_config[2], elems.mesh_config[3],
 416                                   elems.mesh_config[4], elems.mesh_config[5],
 417                                   elems.mesh_config[6]);
 418                 if (ret < 0 || ret >= end - pos)
 419                         return pos - buf;
 420                 pos += ret;
 421         }
 422
 423         bss_basic_rate_set = os_malloc(elems.supp_rates_len +
 424                 elems.ext_supp_rates_len);
 425         if (bss_basic_rate_set == NULL)
 426                 return -1;
 427
 428         bss_basic_rate_set_len = 0;
 429         for (i = 0; i < elems.supp_rates_len; i++) {
 430                 if (elems.supp_rates[i] & 0x80) {
 431                         bss_basic_rate_set[bss_basic_rate_set_len++] =
 432                                 (elems.supp_rates[i] & 0x7f) * 5;
 433                 }
 434         }
 435         for (i = 0; i < elems.ext_supp_rates_len; i++) {
 436                 if (elems.ext_supp_rates[i] & 0x80) {
 437                         bss_basic_rate_set[bss_basic_rate_set_len++] =
 438                                 (elems.ext_supp_rates[i] & 0x7f) * 5;
 439                 }
 440         }
 441         if (bss_basic_rate_set_len > 0) {
 442                 ret = os_snprintf(pos, end - pos, "bss_basic_rate_set=%d",
 443                                   bss_basic_rate_set[0]);
 444                 if (ret < 0 || ret >= end - pos)
 445                         return pos - buf;
 446                 pos += ret;
 447
 448                 for (i = 1; i < bss_basic_rate_set_len; i++) {
 449                         ret = os_snprintf(pos, end - pos, " %d",
 450                                           bss_basic_rate_set[i]);
 451                         if (ret < 0 || ret >= end - pos)
 452                                 return pos - buf;
 453                         pos += ret;
 454                 }
 455
 456                 ret = os_snprintf(pos, end - pos, "\n");
 457                 if (ret < 0 || ret >= end - pos)
 458                         return pos - buf;
 459                 pos += ret;
 460         }
 461         os_free(bss_basic_rate_set);
 462
 463         return pos - buf;
 464 }
 465
 466
 467 int wpas_mesh_scan_result_text(const u8 *ies, size_t ies_len, char *buf,
 468                                char *end)
 469 {
 470         return mesh_attr_text(ies, ies_len, buf, end);
 471 }