hostap/wpa_supplicant/mesh.c

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/*
* WPA Supplicant - Basic mesh mode routines
* Copyright (c) 2013-2014, cozybit, Inc. All rights reserved.
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "utils/includes.h"
#include "utils/common.h"
#include "utils/eloop.h"
#include "utils/uuid.h"
#include "common/ieee802_11_defs.h"
#include "common/wpa_ctrl.h"
#include "ap/sta_info.h"
#include "ap/hostapd.h"
#include "ap/ieee802_11.h"
#include "config_ssid.h"
#include "config.h"
#include "wpa_supplicant_i.h"
#include "driver_i.h"
#include "notify.h"
#include "mesh_mpm.h"
#include "mesh.h"
static void wpa_supplicant_mesh_deinit(struct wpa_supplicant *wpa_s)
{
wpa_supplicant_mesh_iface_deinit(wpa_s, wpa_s->ifmsh);
wpa_s->ifmsh = NULL;
wpa_s->current_ssid = NULL;
/* TODO: leave mesh (stop beacon). This will happen on link down
* anyway, so it's not urgent */
}
void wpa_supplicant_mesh_iface_deinit(struct wpa_supplicant *wpa_s,
struct hostapd_iface *ifmsh)
{
if (!ifmsh)
return;
if (ifmsh->mconf) {
mesh_mpm_deinit(wpa_s, ifmsh);
if (ifmsh->mconf->ies) {
ifmsh->mconf->ies = NULL;
/* We cannot free this struct
* because wpa_authenticator on
* hostapd side is also using it
* for now just set to NULL and
* let hostapd code free it.
*/
}
os_free(ifmsh->mconf);
ifmsh->mconf = NULL;
}
/* take care of shared data */
hostapd_interface_deinit(ifmsh);
hostapd_interface_free(ifmsh);
}
static struct mesh_conf * mesh_config_create(struct wpa_ssid *ssid)
{
struct mesh_conf *conf;
conf = os_zalloc(sizeof(struct mesh_conf));
if (!conf)
return NULL;
os_memcpy(conf->meshid, ssid->ssid, ssid->ssid_len);
conf->meshid_len = ssid->ssid_len;
if (ssid->key_mgmt & WPA_KEY_MGMT_SAE)
conf->security |= MESH_CONF_SEC_AUTH |
MESH_CONF_SEC_AMPE;
else
conf->security |= MESH_CONF_SEC_NONE;
/* defaults */
conf->mesh_pp_id = MESH_PATH_PROTOCOL_HWMP;
conf->mesh_pm_id = MESH_PATH_METRIC_AIRTIME;
conf->mesh_cc_id = 0;
conf->mesh_sp_id = MESH_SYNC_METHOD_NEIGHBOR_OFFSET;
conf->mesh_auth_id = (conf->security & MESH_CONF_SEC_AUTH) ? 1 : 0;
return conf;
}
static void wpas_mesh_copy_groups(struct hostapd_data *bss,
struct wpa_supplicant *wpa_s)
{
int num_groups;
size_t groups_size;
for (num_groups = 0; wpa_s->conf->sae_groups[num_groups] > 0;
num_groups++)
;
groups_size = (num_groups + 1) * sizeof(wpa_s->conf->sae_groups[0]);
bss->conf->sae_groups = os_malloc(groups_size);
if (bss->conf->sae_groups)
os_memcpy(bss->conf->sae_groups, wpa_s->conf->sae_groups,
groups_size);
}
static int wpa_supplicant_mesh_init(struct wpa_supplicant *wpa_s,
struct wpa_ssid *ssid)
{
struct hostapd_iface *ifmsh;
struct hostapd_data *bss;
struct hostapd_config *conf;
struct mesh_conf *mconf;
int basic_rates_erp[] = { 10, 20, 55, 60, 110, 120, 240, -1 };
static int default_groups[] = { 19, 20, 21, 25, 26, -1 };
size_t len;
if (!wpa_s->conf->user_mpm) {
/* not much for us to do here */
wpa_msg(wpa_s, MSG_WARNING,
"user_mpm is not enabled in configuration");
return 0;
}
wpa_s->ifmsh = ifmsh = os_zalloc(sizeof(*wpa_s->ifmsh));
if (!ifmsh)
return -ENOMEM;
ifmsh->num_bss = 1;
ifmsh->bss = os_calloc(wpa_s->ifmsh->num_bss,
sizeof(struct hostapd_data *));
if (!ifmsh->bss)
goto out_free;
ifmsh->bss[0] = bss = os_zalloc(sizeof(struct hostapd_data));
if (!bss)
goto out_free;
os_memcpy(bss->own_addr, wpa_s->own_addr, ETH_ALEN);
bss->driver = wpa_s->driver;
bss->drv_priv = wpa_s->drv_priv;
bss->iface = ifmsh;
wpa_s->assoc_freq = ssid->frequency;
wpa_s->current_ssid = ssid;
/* setup an AP config for auth processing */
conf = hostapd_config_defaults();
if (!conf)
goto out_free;
bss->conf = *conf->bss;
bss->conf->start_disabled = 1;
bss->conf->mesh = MESH_ENABLED;
bss->iconf = conf;
ifmsh->conf = conf;
ifmsh->bss[0]->max_plinks = 99;
os_strlcpy(bss->conf->iface, wpa_s->ifname, sizeof(bss->conf->iface));
mconf = mesh_config_create(ssid);
if (!mconf)
goto out_free;
ifmsh->mconf = mconf;
/* need conf->hw_mode for supported rates. */
if (ssid->frequency == 0) {
conf->hw_mode = HOSTAPD_MODE_IEEE80211G;
conf->channel = 1;
} else {
conf->hw_mode = ieee80211_freq_to_chan(ssid->frequency,
&conf->channel);
}
if (conf->hw_mode == NUM_HOSTAPD_MODES) {
wpa_printf(MSG_ERROR, "Unsupported mesh mode frequency: %d MHz",
ssid->frequency);
goto out_free;
}
/*
* XXX: Hack! This is so an MPM which correctly sets the ERP mandatory
* rates as BSSBasicRateSet doesn't reject us. We could add a new
* hw_mode HOSTAPD_MODE_IEEE80211G_ERP, but this is way easier. This
* also makes our BSSBasicRateSet advertised in Beacon frames match the
* one in peering frames, sigh.
*/
if (conf->hw_mode == HOSTAPD_MODE_IEEE80211G) {
conf->basic_rates = os_malloc(sizeof(basic_rates_erp));
if (!conf->basic_rates)
goto out_free;
os_memcpy(conf->basic_rates, basic_rates_erp,
sizeof(basic_rates_erp));
}
if (hostapd_setup_interface(ifmsh)) {
wpa_printf(MSG_ERROR,
"Failed to initialize hostapd interface for mesh");
return -1;
}
if (wpa_drv_init_mesh(wpa_s)) {
wpa_msg(wpa_s, MSG_ERROR, "Failed to init mesh in driver");
return -1;
}
if (mconf->security != MESH_CONF_SEC_NONE) {
if (ssid->passphrase == NULL) {
wpa_printf(MSG_ERROR,
"mesh: Passphrase for SAE not configured");
goto out_free;
}
bss->conf->wpa = ssid->proto;
bss->conf->wpa_key_mgmt = ssid->key_mgmt;
if (wpa_s->conf->sae_groups &&
wpa_s->conf->sae_groups[0] > 0) {
wpas_mesh_copy_groups(bss, wpa_s);
} else {
bss->conf->sae_groups =
os_malloc(sizeof(default_groups));
if (!bss->conf->sae_groups)
goto out_free;
os_memcpy(bss->conf->sae_groups, default_groups,
sizeof(default_groups));
}
len = os_strlen(ssid->passphrase);
bss->conf->ssid.wpa_passphrase =
dup_binstr(ssid->passphrase, len);
}
return 0;
out_free:
wpa_supplicant_mesh_deinit(wpa_s);
return -ENOMEM;
}
void wpa_mesh_notify_peer(struct wpa_supplicant *wpa_s, const u8 *addr,
const u8 *ies, size_t ie_len)
{
struct ieee802_11_elems elems;
wpa_msg(wpa_s, MSG_INFO,
"new peer notification for " MACSTR, MAC2STR(addr));
if (ieee802_11_parse_elems(ies, ie_len, &elems, 0) == ParseFailed) {
wpa_msg(wpa_s, MSG_INFO, "Could not parse beacon from " MACSTR,
MAC2STR(addr));
return;
}
wpa_mesh_new_mesh_peer(wpa_s, addr, &elems);
}
void wpa_supplicant_mesh_add_scan_ie(struct wpa_supplicant *wpa_s,
struct wpabuf **extra_ie)
{
/* EID + 0-length (wildcard) mesh-id */
size_t ielen = 2;
if (wpabuf_resize(extra_ie, ielen) == 0) {
wpabuf_put_u8(*extra_ie, WLAN_EID_MESH_ID);
wpabuf_put_u8(*extra_ie, 0);
}
}
int wpa_supplicant_join_mesh(struct wpa_supplicant *wpa_s,
struct wpa_ssid *ssid)
{
struct wpa_driver_mesh_join_params params;
int ret = 0;
if (!ssid || !ssid->ssid || !ssid->ssid_len || !ssid->frequency) {
ret = -ENOENT;
goto out;
}
wpa_supplicant_mesh_deinit(wpa_s);
os_memset(&params, 0, sizeof(params));
params.meshid = ssid->ssid;
params.meshid_len = ssid->ssid_len;
params.freq = ssid->frequency;
if (ssid->key_mgmt & WPA_KEY_MGMT_SAE) {
params.flags |= WPA_DRIVER_MESH_FLAG_SAE_AUTH;
params.flags |= WPA_DRIVER_MESH_FLAG_AMPE;
wpa_s->conf->user_mpm = 1;
}
if (wpa_s->conf->user_mpm) {
params.flags |= WPA_DRIVER_MESH_FLAG_USER_MPM;
params.conf.flags &= ~WPA_DRIVER_MESH_CONF_FLAG_AUTO_PLINKS;
} else {
params.flags |= WPA_DRIVER_MESH_FLAG_DRIVER_MPM;
params.conf.flags |= WPA_DRIVER_MESH_CONF_FLAG_AUTO_PLINKS;
}
if (wpa_supplicant_mesh_init(wpa_s, ssid)) {
wpa_msg(wpa_s, MSG_ERROR, "Failed to init mesh");
ret = -1;
goto out;
}
if (wpa_s->ifmsh) {
params.ies = wpa_s->ifmsh->mconf->ies;
params.ie_len = wpa_s->ifmsh->mconf->ie_len;
params.basic_rates = wpa_s->ifmsh->basic_rates;
}
wpa_msg(wpa_s, MSG_INFO, "joining mesh %s",
wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
ret = wpa_drv_join_mesh(wpa_s, &params);
if (ret)
wpa_msg(wpa_s, MSG_ERROR, "mesh join error=%d\n", ret);
/* hostapd sets the interface down until we associate */
wpa_drv_set_operstate(wpa_s, 1);
out:
return ret;
}
int wpa_supplicant_leave_mesh(struct wpa_supplicant *wpa_s)
{
int ret = 0;
wpa_msg(wpa_s, MSG_INFO, "leaving mesh");
ret = wpa_drv_leave_mesh(wpa_s);
if (ret)
wpa_msg(wpa_s, MSG_ERROR, "mesh leave error=%d", ret);
wpa_drv_set_operstate(wpa_s, 1);
wpa_supplicant_mesh_deinit(wpa_s);
return ret;
}