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
 126         if (!wpa_s->conf->user_mpm) {
 127                 /* not much for us to do here */
 128                 wpa_msg(wpa_s, MSG_WARNING,
 129                         "user_mpm is not enabled in configuration");
 130                 return 0;
 131         }
 132
 133         wpa_s->ifmsh = ifmsh = os_zalloc(sizeof(*wpa_s->ifmsh));
 134         if (!ifmsh)
 135                 return -ENOMEM;
 136
 137         ifmsh->drv_flags = wpa_s->drv_flags;
 138         ifmsh->num_bss = 1;
 139         ifmsh->bss = os_calloc(wpa_s->ifmsh->num_bss,
 140                                sizeof(struct hostapd_data *));
 141         if (!ifmsh->bss)
 142                 goto out_free;
 143
 144         ifmsh->bss[0] = bss = os_zalloc(sizeof(struct hostapd_data));
 145         if (!bss)
 146                 goto out_free;
 147
 148         os_memcpy(bss->own_addr, wpa_s->own_addr, ETH_ALEN);
 149         bss->driver = wpa_s->driver;
 150         bss->drv_priv = wpa_s->drv_priv;
 151         bss->iface = ifmsh;
 152         bss->mesh_sta_free_cb = mesh_mpm_free_sta;
 153         wpa_s->assoc_freq = ssid->frequency;
 154         wpa_s->current_ssid = ssid;
 155
 156         /* setup an AP config for auth processing */
 157         conf = hostapd_config_defaults();
 158         if (!conf)
 159                 goto out_free;
 160
 161         bss->conf = *conf->bss;
 162         bss->conf->start_disabled = 1;
 163         bss->conf->mesh = MESH_ENABLED;
 164         bss->iconf = conf;
 165         ifmsh->conf = conf;
 166
 167         ifmsh->bss[0]->max_plinks = 99;
 168         os_strlcpy(bss->conf->iface, wpa_s->ifname, sizeof(bss->conf->iface));
 169
 170         mconf = mesh_config_create(ssid);
 171         if (!mconf)
 172                 goto out_free;
 173         ifmsh->mconf = mconf;
 174
 175         /* need conf->hw_mode for supported rates. */
 176         if (ssid->frequency == 0) {
 177                 conf->hw_mode = HOSTAPD_MODE_IEEE80211G;
 178                 conf->channel = 1;
 179         } else {
 180                 conf->hw_mode = ieee80211_freq_to_chan(ssid->frequency,
 181                                                        &conf->channel);
 182         }
 183         if (conf->hw_mode == NUM_HOSTAPD_MODES) {
 184                 wpa_printf(MSG_ERROR, "Unsupported mesh mode frequency: %d MHz",
 185                            ssid->frequency);
 186                 goto out_free;
 187         }
 188
 189         /*
 190          * XXX: Hack! This is so an MPM which correctly sets the ERP mandatory
 191          * rates as BSSBasicRateSet doesn't reject us. We could add a new
 192          * hw_mode HOSTAPD_MODE_IEEE80211G_ERP, but this is way easier. This
 193          * also makes our BSSBasicRateSet advertised in Beacon frames match the
 194          * one in peering frames, sigh.
 195          */
 196         if (conf->hw_mode == HOSTAPD_MODE_IEEE80211G) {
 197                 conf->basic_rates = os_malloc(sizeof(basic_rates_erp));
 198                 if (!conf->basic_rates)
 199                         goto out_free;
 200                 os_memcpy(conf->basic_rates, basic_rates_erp,
 201                           sizeof(basic_rates_erp));
 202         }
 203
 204         if (hostapd_setup_interface(ifmsh)) {
 205                 wpa_printf(MSG_ERROR,
 206                            "Failed to initialize hostapd interface for mesh");
 207                 return -1;
 208         }
 209
 210         if (wpa_drv_init_mesh(wpa_s)) {
 211                 wpa_msg(wpa_s, MSG_ERROR, "Failed to init mesh in driver");
 212                 return -1;
 213         }
 214
 215         if (mconf->security != MESH_CONF_SEC_NONE) {
 216                 if (ssid->passphrase == NULL) {
 217                         wpa_printf(MSG_ERROR,
 218                                    "mesh: Passphrase for SAE not configured");
 219                         goto out_free;
 220                 }
 221
 222                 bss->conf->wpa = ssid->proto;
 223                 bss->conf->wpa_key_mgmt = ssid->key_mgmt;
 224
 225                 if (wpa_s->conf->sae_groups &&
 226                     wpa_s->conf->sae_groups[0] > 0) {
 227                         wpas_mesh_copy_groups(bss, wpa_s);
 228                 } else {
 229                         bss->conf->sae_groups =
 230                                 os_malloc(sizeof(default_groups));
 231                         if (!bss->conf->sae_groups)
 232                                 goto out_free;
 233                         os_memcpy(bss->conf->sae_groups, default_groups,
 234                                   sizeof(default_groups));
 235                 }
 236
 237                 len = os_strlen(ssid->passphrase);
 238                 bss->conf->ssid.wpa_passphrase =
 239                         dup_binstr(ssid->passphrase, len);
 240
 241                 wpa_s->mesh_rsn = mesh_rsn_auth_init(wpa_s, mconf);
 242                 if (!wpa_s->mesh_rsn)
 243                         goto out_free;
 244         }
 245
 246         wpa_supplicant_conf_ap_ht(wpa_s, ssid, conf);
 247
 248         return 0;
 249 out_free:
 250         wpa_supplicant_mesh_deinit(wpa_s);
 251         return -ENOMEM;
 252 }
 253
 254
 255 void wpa_mesh_notify_peer(struct wpa_supplicant *wpa_s, const u8 *addr,
 256                           const u8 *ies, size_t ie_len)
 257 {
 258         struct ieee802_11_elems elems;
 259
 260         wpa_msg(wpa_s, MSG_INFO,
 261                 "new peer notification for " MACSTR, MAC2STR(addr));
 262
 263         if (ieee802_11_parse_elems(ies, ie_len, &elems, 0) == ParseFailed) {
 264                 wpa_msg(wpa_s, MSG_INFO, "Could not parse beacon from " MACSTR,
 265                         MAC2STR(addr));
 266                 return;
 267         }
 268         wpa_mesh_new_mesh_peer(wpa_s, addr, &elems);
 269 }
 270
 271
 272 void wpa_supplicant_mesh_add_scan_ie(struct wpa_supplicant *wpa_s,
 273                                      struct wpabuf **extra_ie)
 274 {
 275         /* EID + 0-length (wildcard) mesh-id */
 276         size_t ielen = 2;
 277
 278         if (wpabuf_resize(extra_ie, ielen) == 0) {
 279                 wpabuf_put_u8(*extra_ie, WLAN_EID_MESH_ID);
 280                 wpabuf_put_u8(*extra_ie, 0);
 281         }
 282 }
 283
 284
 285 int wpa_supplicant_join_mesh(struct wpa_supplicant *wpa_s,
 286                              struct wpa_ssid *ssid)
 287 {
 288         struct wpa_driver_mesh_join_params params;
 289         int ret = 0;
 290
 291         if (!ssid || !ssid->ssid || !ssid->ssid_len || !ssid->frequency) {
 292                 ret = -ENOENT;
 293                 goto out;
 294         }
 295
 296         wpa_supplicant_mesh_deinit(wpa_s);
 297
 298         os_memset(&params, 0, sizeof(params));
 299         params.meshid = ssid->ssid;
 300         params.meshid_len = ssid->ssid_len;
 301         params.freq = ssid->frequency;
 302 #ifdef CONFIG_IEEE80211N
 303         params.ht_mode = ssid->mesh_ht_mode;
 304 #endif /* CONFIG_IEEE80211N */
 305
 306         if (ssid->key_mgmt & WPA_KEY_MGMT_SAE) {
 307                 params.flags |= WPA_DRIVER_MESH_FLAG_SAE_AUTH;
 308                 params.flags |= WPA_DRIVER_MESH_FLAG_AMPE;
 309                 wpa_s->conf->user_mpm = 1;
 310         }
 311
 312         if (wpa_s->conf->user_mpm) {
 313                 params.flags |= WPA_DRIVER_MESH_FLAG_USER_MPM;
 314                 params.conf.flags &= ~WPA_DRIVER_MESH_CONF_FLAG_AUTO_PLINKS;
 315         } else {
 316                 params.flags |= WPA_DRIVER_MESH_FLAG_DRIVER_MPM;
 317                 params.conf.flags |= WPA_DRIVER_MESH_CONF_FLAG_AUTO_PLINKS;
 318         }
 319
 320         if (wpa_supplicant_mesh_init(wpa_s, ssid)) {
 321                 wpa_msg(wpa_s, MSG_ERROR, "Failed to init mesh");
 322                 ret = -1;
 323                 goto out;
 324         }
 325
 326         if (wpa_s->ifmsh) {
 327                 params.ies = wpa_s->ifmsh->mconf->ies;
 328                 params.ie_len = wpa_s->ifmsh->mconf->ie_len;
 329                 params.basic_rates = wpa_s->ifmsh->basic_rates;
 330         }
 331
 332         wpa_msg(wpa_s, MSG_INFO, "joining mesh %s",
 333                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 334         ret = wpa_drv_join_mesh(wpa_s, &params);
 335         if (ret)
 336                 wpa_msg(wpa_s, MSG_ERROR, "mesh join error=%d\n", ret);
 337
 338         /* hostapd sets the interface down until we associate */
 339         wpa_drv_set_operstate(wpa_s, 1);
 340
 341 out:
 342         return ret;
 343 }
 344
 345
 346 int wpa_supplicant_leave_mesh(struct wpa_supplicant *wpa_s)
 347 {
 348         int ret = 0;
 349
 350         wpa_msg(wpa_s, MSG_INFO, "leaving mesh");
 351
 352         ret = wpa_drv_leave_mesh(wpa_s);
 353         if (ret)
 354                 wpa_msg(wpa_s, MSG_ERROR, "mesh leave error=%d", ret);
 355
 356         wpa_drv_set_operstate(wpa_s, 1);
 357
 358         wpa_supplicant_mesh_deinit(wpa_s);
 359
 360         return ret;
 361 }