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Add support for Time Advertisement

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This adds preliminary support for IEEE 802.11v Time Advertisement
mechanism with UTC TSF offset.
This commit is contained in:
Jouni Malinen 2011-10-18 00:24:16 +03:00 committed by Jouni Malinen
parent 96b2cb226a
commit 39b97072b2
11 changed files with 156 additions and 0 deletions
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14
hostapd/config_file.c
View file

@ -2092,6 +2092,20 @@ struct hostapd_config * hostapd_config_read(const char *fname)
extern int rsn_testing;
rsn_testing = atoi(pos);
#endif /* CONFIG_RSN_TESTING */
} else if (os_strcmp(buf, "time_advertisement") == 0) {
bss->time_advertisement = atoi(pos);
} else if (os_strcmp(buf, "time_zone") == 0) {
size_t tz_len = os_strlen(pos);
if (tz_len < 4 || tz_len > 255) {
wpa_printf(MSG_DEBUG, "Line %d: invalid "
"time_zone", line);
errors++;
continue;
}
os_free(bss->time_zone);
bss->time_zone = os_strdup(pos);
if (bss->time_zone == NULL)
errors++;
#ifdef CONFIG_INTERWORKING
} else if (os_strcmp(buf, "interworking") == 0) {
bss->interworking = atoi(pos);

11
hostapd/hostapd.conf
View file

@ -1023,6 +1023,17 @@ own_ip_addr=127.0.0.1
# Prohibit use of TDLS Channel Switching in this BSS
#tdls_prohibit_chan_switch=1
##### IEEE 802.11v-2011 #######################################################
# Time advertisement
# 0 = disabled (default)
# 2 = UTC time at which the TSF timer is 0
#time_advertisement=2
# Local time zone as specified in 8.3 of IEEE Std 1003.1-2004:
# stdoffset[dst[offset][,start[/time],end[/time]]]
#time_zone=EST5
##### IEEE 802.11u-2011 #######################################################
# Enable Interworking service

2
src/ap/ap_config.c
View file

@ -426,6 +426,8 @@ static void hostapd_config_free_bss(struct hostapd_bss_config *conf)
ssid->dyn_vlan_keys = NULL;
}
os_free(conf->time_zone);
#ifdef CONFIG_IEEE80211R
{
struct ft_remote_r0kh *r0kh, *r0kh_prev;

4
src/ap/ap_config.h
View file

@ -342,6 +342,10 @@ struct hostapd_bss_config {
int tdls;
int disable_11n;
/* IEEE 802.11v */
int time_advertisement;
char *time_zone;
/* IEEE 802.11u - Interworking */
int interworking;
int access_network_type;

14
src/ap/ap_drv_ops.c
View file

@ -51,6 +51,20 @@ int hostapd_build_ap_extra_ies(struct hostapd_data *hapd,
*beacon_ret = *proberesp_ret = *assocresp_ret = NULL;
pos = buf;
pos = hostapd_eid_time_adv(hapd, pos);
if (pos != buf) {
if (wpabuf_resize(&beacon, pos - buf) != 0)
goto fail;
wpabuf_put_data(beacon, buf, pos - buf);
}
pos = hostapd_eid_time_zone(hapd, pos);
if (pos != buf) {
if (wpabuf_resize(&proberesp, pos - buf) != 0)
goto fail;
wpabuf_put_data(proberesp, buf, pos - buf);
}
pos = buf;
pos = hostapd_eid_ext_capab(hapd, pos);
if (pos != buf) {

9
src/ap/beacon.c
View file

@ -357,6 +357,9 @@ void handle_probe_req(struct hostapd_data *hapd,
pos = hostapd_eid_ext_capab(hapd, pos);
pos = hostapd_eid_time_adv(hapd, pos);
pos = hostapd_eid_time_zone(hapd, pos);
pos = hostapd_eid_interworking(hapd, pos);
pos = hostapd_eid_adv_proto(hapd, pos);
pos = hostapd_eid_roaming_consortium(hapd, pos);
@ -494,6 +497,12 @@ void ieee802_11_set_beacon(struct hostapd_data *hapd)
tailpos = hostapd_eid_ext_capab(hapd, tailpos);
/*
* TODO: Time Advertisement element should only be included in some
* DTIM Beacon frames.
*/
tailpos = hostapd_eid_time_adv(hapd, tailpos);
tailpos = hostapd_eid_interworking(hapd, tailpos);
tailpos = hostapd_eid_adv_proto(hapd, tailpos);
tailpos = hostapd_eid_roaming_consortium(hapd, tailpos);

2
src/ap/hostapd.c
View file

@ -261,6 +261,8 @@ static void hostapd_cleanup(struct hostapd_data *hapd)
wpabuf_free(hapd->p2p_probe_resp_ie);
hapd->p2p_probe_resp_ie = NULL;
#endif /* CONFIG_P2P */
wpabuf_free(hapd->time_adv);
}

4
src/ap/hostapd.h
View file

@ -108,6 +108,10 @@ struct hostapd_data {
int parameter_set_count;
/* Time Advertisement */
u8 time_update_counter;
struct wpabuf *time_adv;
#ifdef CONFIG_FULL_DYNAMIC_VLAN
struct full_dynamic_vlan *full_dynamic_vlan;
#endif /* CONFIG_FULL_DYNAMIC_VLAN */

3
src/ap/ieee802_11.h
View file

@ -72,5 +72,8 @@ void ieee802_11_sa_query_action(struct hostapd_data *hapd,
u8 * hostapd_eid_interworking(struct hostapd_data *hapd, u8 *eid);
u8 * hostapd_eid_adv_proto(struct hostapd_data *hapd, u8 *eid);
u8 * hostapd_eid_roaming_consortium(struct hostapd_data *hapd, u8 *eid);
u8 * hostapd_eid_time_adv(struct hostapd_data *hapd, u8 *eid);
u8 * hostapd_eid_time_zone(struct hostapd_data *hapd, u8 *eid);
int hostapd_update_time_adv(struct hostapd_data *hapd);
#endif /* IEEE802_11_H */

91
src/ap/ieee802_11_shared.c
View file

@ -20,6 +20,7 @@
#include "sta_info.h"
#include "ap_config.h"
#include "ap_drv_ops.h"
#include "ieee802_11.h"
#ifdef CONFIG_IEEE80211W
@ -188,6 +189,8 @@ u8 * hostapd_eid_ext_capab(struct hostapd_data *hapd, u8 *eid)
*pos++ = 0x00;
*pos = 0x00;
if (hapd->conf->time_advertisement == 2)
*pos |= 0x08; /* Bit 27 - UTC TSF Offset */
if (hapd->conf->interworking)
*pos |= 0x80; /* Bit 31 - Interworking */
pos++;
@ -309,3 +312,91 @@ u8 * hostapd_eid_roaming_consortium(struct hostapd_data *hapd, u8 *eid)
return pos;
}
u8 * hostapd_eid_time_adv(struct hostapd_data *hapd, u8 *eid)
{
if (hapd->conf->time_advertisement != 2)
return eid;
if (hapd->time_adv == NULL &&
hostapd_update_time_adv(hapd) < 0)
return eid;
os_memcpy(eid, wpabuf_head(hapd->time_adv),
wpabuf_len(hapd->time_adv));
eid += wpabuf_len(hapd->time_adv);
return eid;
}
u8 * hostapd_eid_time_zone(struct hostapd_data *hapd, u8 *eid)
{
size_t len;
if (hapd->conf->time_advertisement != 2)
return eid;
len = os_strlen(hapd->conf->time_zone);
*eid++ = WLAN_EID_TIME_ZONE;
*eid++ = len;
os_memcpy(eid, hapd->conf->time_zone, len);
eid += len;
return eid;
}
int hostapd_update_time_adv(struct hostapd_data *hapd)
{
const int elen = 2 + 1 + 10 + 5 + 1;
struct os_time t;
struct os_tm tm;
u8 *pos;
if (hapd->conf->time_advertisement != 2)
return 0;
if (os_get_time(&t) < 0 || os_gmtime(t.sec, &tm) < 0)
return -1;
if (!hapd->time_adv) {
hapd->time_adv = wpabuf_alloc(elen);
if (hapd->time_adv == NULL)
return -1;
pos = wpabuf_put(hapd->time_adv, elen);
} else
pos = wpabuf_mhead_u8(hapd->time_adv);
*pos++ = WLAN_EID_TIME_ADVERTISEMENT;
*pos++ = 1 + 10 + 5 + 1;
*pos++ = 2; /* UTC time at which the TSF timer is 0 */
/* Time Value at TSF 0 */
/* FIX: need to calculate this based on the current TSF value */
WPA_PUT_LE16(pos, tm.year); /* Year */
pos += 2;
*pos++ = tm.month; /* Month */
*pos++ = tm.day; /* Day of month */
*pos++ = tm.hour; /* Hours */
*pos++ = tm.min; /* Minutes */
*pos++ = tm.sec; /* Seconds */
WPA_PUT_LE16(pos, 0); /* Milliseconds (not used) */
pos += 2;
*pos++ = 0; /* Reserved */
/* Time Error */
/* TODO: fill in an estimate on the error */
*pos++ = 0;
*pos++ = 0;
*pos++ = 0;
*pos++ = 0;
*pos++ = 0;
*pos++ = hapd->time_update_counter++;
return 0;
}

2
src/common/ieee802_11_defs.h
View file

@ -229,10 +229,12 @@
#define WLAN_EID_RIC_DATA 57
#define WLAN_EID_HT_OPERATION 61
#define WLAN_EID_SECONDARY_CHANNEL_OFFSET 62
#define WLAN_EID_TIME_ADVERTISEMENT 69
#define WLAN_EID_20_40_BSS_COEXISTENCE 72
#define WLAN_EID_20_40_BSS_INTOLERANT 73
#define WLAN_EID_OVERLAPPING_BSS_SCAN_PARAMS 74
#define WLAN_EID_MMIE 76
#define WLAN_EID_TIME_ZONE 98
#define WLAN_EID_LINK_ID 101
#define WLAN_EID_INTERWORKING 107
#define WLAN_EID_ADV_PROTO 108