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hostapd: Add mechanism to track unconnected stations

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hostapd can now be configured to track unconnected stations based on
Probe Request frames seen from them. This can be used, e.g., to detect
dualband capable station before they have associated. Such information
could then be used to provide guidance on which colocated BSS to use in
case of a dualband AP that operates concurrently on multiple bands under
the control of a single hostapd process.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2015-09-05 17:11:11 +03:00
parent 6ebe816be0
commit a65a9b8d67
9 changed files with 155 additions and 0 deletions
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72
src/ap/beacon.c
View file

@ -552,6 +552,76 @@ static enum ssid_match_result ssid_match(struct hostapd_data *hapd,
}
void sta_track_expire(struct hostapd_iface *iface, int force)
{
struct os_reltime now;
struct hostapd_sta_info *info;
if (!iface->num_sta_seen)
return;
os_get_reltime(&now);
while ((info = dl_list_first(&iface->sta_seen, struct hostapd_sta_info,
list))) {
if (!force &&
!os_reltime_expired(&now, &info->last_seen,
iface->conf->track_sta_max_age))
break;
force = 0;
wpa_printf(MSG_MSGDUMP, "%s: Expire STA tracking entry for "
MACSTR, iface->bss[0]->conf->iface,
MAC2STR(info->addr));
dl_list_del(&info->list);
iface->num_sta_seen--;
os_free(info);
}
}
static struct hostapd_sta_info * sta_track_get(struct hostapd_iface *iface,
const u8 *addr)
{
struct hostapd_sta_info *info;
dl_list_for_each(info, &iface->sta_seen, struct hostapd_sta_info, list)
if (os_memcmp(addr, info->addr, ETH_ALEN) == 0)
return info;
return NULL;
}
static void sta_track_add(struct hostapd_iface *iface, const u8 *addr)
{
struct hostapd_sta_info *info;
info = sta_track_get(iface, addr);
if (info) {
/* Move the most recent entry to the end of the list */
dl_list_del(&info->list);
dl_list_add_tail(&iface->sta_seen, &info->list);
os_get_reltime(&info->last_seen);
return;
}
/* Add a new entry */
info = os_zalloc(sizeof(*info));
os_memcpy(info->addr, addr, ETH_ALEN);
os_get_reltime(&info->last_seen);
if (iface->num_sta_seen >= iface->conf->track_sta_max_num) {
/* Expire oldest entry to make room for a new one */
sta_track_expire(iface, 1);
}
wpa_printf(MSG_MSGDUMP, "%s: Add STA tracking entry for "
MACSTR, iface->bss[0]->conf->iface, MAC2STR(addr));
dl_list_add_tail(&iface->sta_seen, &info->list);
iface->num_sta_seen++;
}
void handle_probe_req(struct hostapd_data *hapd,
const struct ieee80211_mgmt *mgmt, size_t len,
int ssi_signal)
@ -567,6 +637,8 @@ void handle_probe_req(struct hostapd_data *hapd,
ie = mgmt->u.probe_req.variable;
if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req))
return;
if (hapd->iconf->track_sta_max_num)
sta_track_add(hapd->iface, mgmt->sa);
ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req));
for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++)