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