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 "mesh_mpm.h"
  25 #include "mesh_rsn.h"
  26 #include "mesh.h"
  27
  28
  29 static void wpa_supplicant_mesh_deinit(struct wpa_supplicant *wpa_s)
  30 {
  31         wpa_supplicant_mesh_iface_deinit(wpa_s, wpa_s->ifmsh);
  32         wpa_s->ifmsh = NULL;
  33         wpa_s->current_ssid = NULL;
  34         os_free(wpa_s->mesh_rsn);
  35         wpa_s->mesh_rsn = NULL;
  36         /* TODO: leave mesh (stop beacon). This will happen on link down
  37          * anyway, so it's not urgent */
  38 }
  39
  40
  41 void wpa_supplicant_mesh_iface_deinit(struct wpa_supplicant *wpa_s,
  42                                       struct hostapd_iface *ifmsh)
  43 {
  44         if (!ifmsh)
  45                 return;
  46
  47         if (ifmsh->mconf) {
  48                 mesh_mpm_deinit(wpa_s, ifmsh);
  49                 if (ifmsh->mconf->ies) {
  50                         ifmsh->mconf->ies = NULL;
  51                         /* We cannot free this struct
  52                          * because wpa_authenticator on
  53                          * hostapd side is also using it
  54                          * for now just set to NULL and
  55                          * let hostapd code free it.
  56                          */
  57                 }
  58                 os_free(ifmsh->mconf);
  59                 ifmsh->mconf = NULL;
  60         }
  61
  62         /* take care of shared data */
  63         hostapd_interface_deinit(ifmsh);
  64         hostapd_interface_free(ifmsh);
  65 }
  66
  67
  68 static struct mesh_conf * mesh_config_create(struct wpa_ssid *ssid)
  69 {
  70         struct mesh_conf *conf;
  71
  72         conf = os_zalloc(sizeof(struct mesh_conf));
  73         if (!conf)
  74                 return NULL;
  75
  76         os_memcpy(conf->meshid, ssid->ssid, ssid->ssid_len);
  77         conf->meshid_len = ssid->ssid_len;
  78
  79         if (ssid->key_mgmt & WPA_KEY_MGMT_SAE)
  80                 conf->security |= MESH_CONF_SEC_AUTH |
  81                         MESH_CONF_SEC_AMPE;
  82         else
  83                 conf->security |= MESH_CONF_SEC_NONE;
  84
  85         /* defaults */
  86         conf->mesh_pp_id = MESH_PATH_PROTOCOL_HWMP;
  87         conf->mesh_pm_id = MESH_PATH_METRIC_AIRTIME;
  88         conf->mesh_cc_id = 0;
  89         conf->mesh_sp_id = MESH_SYNC_METHOD_NEIGHBOR_OFFSET;
  90         conf->mesh_auth_id = (conf->security & MESH_CONF_SEC_AUTH) ? 1 : 0;
  91
  92         return conf;
  93 }
  94
  95
  96 static void wpas_mesh_copy_groups(struct hostapd_data *bss,
  97                                   struct wpa_supplicant *wpa_s)
  98 {
  99         int num_groups;
 100         size_t groups_size;
 101
 102         for (num_groups = 0; wpa_s->conf->sae_groups[num_groups] > 0;
 103              num_groups++)
 104                 ;
 105
 106         groups_size = (num_groups + 1) * sizeof(wpa_s->conf->sae_groups[0]);
 107         bss->conf->sae_groups = os_malloc(groups_size);
 108         if (bss->conf->sae_groups)
 109                 os_memcpy(bss->conf->sae_groups, wpa_s->conf->sae_groups,
 110                           groups_size);
 111 }
 112
 113
 114 static int wpa_supplicant_mesh_init(struct wpa_supplicant *wpa_s,
 115                                     struct wpa_ssid *ssid)
 116 {
 117         struct hostapd_iface *ifmsh;
 118         struct hostapd_data *bss;
 119         struct hostapd_config *conf;
 120         struct mesh_conf *mconf;
 121         int basic_rates_erp[] = { 10, 20, 55, 60, 110, 120, 240, -1 };
 122         static int default_groups[] = { 19, 20, 21, 25, 26, -1 };
 123         size_t len;
 124
 125         if (!wpa_s->conf->user_mpm) {
 126                 /* not much for us to do here */
 127                 wpa_msg(wpa_s, MSG_WARNING,
 128                         "user_mpm is not enabled in configuration");
 129                 return 0;
 130         }
 131
 132         wpa_s->ifmsh = ifmsh = os_zalloc(sizeof(*wpa_s->ifmsh));
 133         if (!ifmsh)
 134                 return -ENOMEM;
 135
 136         ifmsh->num_bss = 1;
 137         ifmsh->bss = os_calloc(wpa_s->ifmsh->num_bss,
 138                                sizeof(struct hostapd_data *));
 139         if (!ifmsh->bss)
 140                 goto out_free;
 141
 142         ifmsh->bss[0] = bss = os_zalloc(sizeof(struct hostapd_data));
 143         if (!bss)
 144                 goto out_free;
 145
 146         os_memcpy(bss->own_addr, wpa_s->own_addr, ETH_ALEN);
 147         bss->driver = wpa_s->driver;
 148         bss->drv_priv = wpa_s->drv_priv;
 149         bss->iface = ifmsh;
 150         bss->mesh_sta_free_cb = mesh_mpm_free_sta;
 151         wpa_s->assoc_freq = ssid->frequency;
 152         wpa_s->current_ssid = ssid;
 153
 154         /* setup an AP config for auth processing */
 155         conf = hostapd_config_defaults();
 156         if (!conf)
 157                 goto out_free;
 158
 159         bss->conf = *conf->bss;
 160         bss->conf->start_disabled = 1;
 161         bss->conf->mesh = MESH_ENABLED;
 162         bss->iconf = conf;
 163         ifmsh->conf = conf;
 164
 165         ifmsh->bss[0]->max_plinks = 99;
 166         os_strlcpy(bss->conf->iface, wpa_s->ifname, sizeof(bss->conf->iface));
 167
 168         mconf = mesh_config_create(ssid);
 169         if (!mconf)
 170                 goto out_free;
 171         ifmsh->mconf = mconf;
 172
 173         /* need conf->hw_mode for supported rates. */
 174         if (ssid->frequency == 0) {
 175                 conf->hw_mode = HOSTAPD_MODE_IEEE80211G;
 176                 conf->channel = 1;
 177         } else {
 178                 conf->hw_mode = ieee80211_freq_to_chan(ssid->frequency,
 179                                                        &conf->channel);
 180         }
 181         if (conf->hw_mode == NUM_HOSTAPD_MODES) {
 182                 wpa_printf(MSG_ERROR, "Unsupported mesh mode frequency: %d MHz",
 183                            ssid->frequency);
 184                 goto out_free;
 185         }
 186
 187         /*
 188          * XXX: Hack! This is so an MPM which correctly sets the ERP mandatory
 189          * rates as BSSBasicRateSet doesn't reject us. We could add a new
 190          * hw_mode HOSTAPD_MODE_IEEE80211G_ERP, but this is way easier. This
 191          * also makes our BSSBasicRateSet advertised in Beacon frames match the
 192          * one in peering frames, sigh.
 193          */
 194         if (conf->hw_mode == HOSTAPD_MODE_IEEE80211G) {
 195                 conf->basic_rates = os_malloc(sizeof(basic_rates_erp));
 196                 if (!conf->basic_rates)
 197                         goto out_free;
 198                 os_memcpy(conf->basic_rates, basic_rates_erp,
 199                           sizeof(basic_rates_erp));
 200         }
 201
 202         if (hostapd_setup_interface(ifmsh)) {
 203                 wpa_printf(MSG_ERROR,
 204                            "Failed to initialize hostapd interface for mesh");
 205                 return -1;
 206         }
 207
 208         if (wpa_drv_init_mesh(wpa_s)) {
 209                 wpa_msg(wpa_s, MSG_ERROR, "Failed to init mesh in driver");
 210                 return -1;
 211         }
 212
 213         if (mconf->security != MESH_CONF_SEC_NONE) {
 214                 if (ssid->passphrase == NULL) {
 215                         wpa_printf(MSG_ERROR,
 216                                    "mesh: Passphrase for SAE not configured");
 217                         goto out_free;
 218                 }
 219
 220                 bss->conf->wpa = ssid->proto;
 221                 bss->conf->wpa_key_mgmt = ssid->key_mgmt;
 222
 223                 if (wpa_s->conf->sae_groups &&
 224                     wpa_s->conf->sae_groups[0] > 0) {
 225                         wpas_mesh_copy_groups(bss, wpa_s);
 226                 } else {
 227                         bss->conf->sae_groups =
 228                                 os_malloc(sizeof(default_groups));
 229                         if (!bss->conf->sae_groups)
 230                                 goto out_free;
 231                         os_memcpy(bss->conf->sae_groups, default_groups,
 232                                   sizeof(default_groups));
 233                 }
 234
 235                 len = os_strlen(ssid->passphrase);
 236                 bss->conf->ssid.wpa_passphrase =
 237                         dup_binstr(ssid->passphrase, len);
 238
 239                 wpa_s->mesh_rsn = mesh_rsn_auth_init(wpa_s, mconf);
 240                 if (!wpa_s->mesh_rsn)
 241                         goto out_free;
 242         }
 243
 244         return 0;
 245 out_free:
 246         wpa_supplicant_mesh_deinit(wpa_s);
 247         return -ENOMEM;
 248 }
 249
 250
 251 void wpa_mesh_notify_peer(struct wpa_supplicant *wpa_s, const u8 *addr,
 252                           const u8 *ies, size_t ie_len)
 253 {
 254         struct ieee802_11_elems elems;
 255
 256         wpa_msg(wpa_s, MSG_INFO,
 257                 "new peer notification for " MACSTR, MAC2STR(addr));
 258
 259         if (ieee802_11_parse_elems(ies, ie_len, &elems, 0) == ParseFailed) {
 260                 wpa_msg(wpa_s, MSG_INFO, "Could not parse beacon from " MACSTR,
 261                         MAC2STR(addr));
 262                 return;
 263         }
 264         wpa_mesh_new_mesh_peer(wpa_s, addr, &elems);
 265 }
 266
 267
 268 void wpa_supplicant_mesh_add_scan_ie(struct wpa_supplicant *wpa_s,
 269                                      struct wpabuf **extra_ie)
 270 {
 271         /* EID + 0-length (wildcard) mesh-id */
 272         size_t ielen = 2;
 273
 274         if (wpabuf_resize(extra_ie, ielen) == 0) {
 275                 wpabuf_put_u8(*extra_ie, WLAN_EID_MESH_ID);
 276                 wpabuf_put_u8(*extra_ie, 0);
 277         }
 278 }
 279
 280
 281 int wpa_supplicant_join_mesh(struct wpa_supplicant *wpa_s,
 282                              struct wpa_ssid *ssid)
 283 {
 284         struct wpa_driver_mesh_join_params params;
 285         int ret = 0;
 286
 287         if (!ssid || !ssid->ssid || !ssid->ssid_len || !ssid->frequency) {
 288                 ret = -ENOENT;
 289                 goto out;
 290         }
 291
 292         wpa_supplicant_mesh_deinit(wpa_s);
 293
 294         os_memset(&params, 0, sizeof(params));
 295         params.meshid = ssid->ssid;
 296         params.meshid_len = ssid->ssid_len;
 297         params.freq = ssid->frequency;
 298
 299         if (ssid->key_mgmt & WPA_KEY_MGMT_SAE) {
 300                 params.flags |= WPA_DRIVER_MESH_FLAG_SAE_AUTH;
 301                 params.flags |= WPA_DRIVER_MESH_FLAG_AMPE;
 302                 wpa_s->conf->user_mpm = 1;
 303         }
 304
 305         if (wpa_s->conf->user_mpm) {
 306                 params.flags |= WPA_DRIVER_MESH_FLAG_USER_MPM;
 307                 params.conf.flags &= ~WPA_DRIVER_MESH_CONF_FLAG_AUTO_PLINKS;
 308         } else {
 309                 params.flags |= WPA_DRIVER_MESH_FLAG_DRIVER_MPM;
 310                 params.conf.flags |= WPA_DRIVER_MESH_CONF_FLAG_AUTO_PLINKS;
 311         }
 312
 313         if (wpa_supplicant_mesh_init(wpa_s, ssid)) {
 314                 wpa_msg(wpa_s, MSG_ERROR, "Failed to init mesh");
 315                 ret = -1;
 316                 goto out;
 317         }
 318
 319         if (wpa_s->ifmsh) {
 320                 params.ies = wpa_s->ifmsh->mconf->ies;
 321                 params.ie_len = wpa_s->ifmsh->mconf->ie_len;
 322                 params.basic_rates = wpa_s->ifmsh->basic_rates;
 323         }
 324
 325         wpa_msg(wpa_s, MSG_INFO, "joining mesh %s",
 326                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 327         ret = wpa_drv_join_mesh(wpa_s, &params);
 328         if (ret)
 329                 wpa_msg(wpa_s, MSG_ERROR, "mesh join error=%d\n", ret);
 330
 331         /* hostapd sets the interface down until we associate */
 332         wpa_drv_set_operstate(wpa_s, 1);
 333
 334 out:
 335         return ret;
 336 }
 337
 338
 339 int wpa_supplicant_leave_mesh(struct wpa_supplicant *wpa_s)
 340 {
 341         int ret = 0;
 342
 343         wpa_msg(wpa_s, MSG_INFO, "leaving mesh");
 344
 345         ret = wpa_drv_leave_mesh(wpa_s);
 346         if (ret)
 347                 wpa_msg(wpa_s, MSG_ERROR, "mesh leave error=%d", ret);
 348
 349         wpa_drv_set_operstate(wpa_s, 1);
 350
 351         wpa_supplicant_mesh_deinit(wpa_s);
 352
 353         return ret;
 354 }