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