OCE: Add RSSI based association rejection support (AP)

An AP might reject a STA association request due to low RSSI. In such
case, the AP informs the STA the desired RSSI improvement and a retry
timeout. The STA might retry to associate even if the RSSI hasn't
improved if the retry timeout expired.

Signed-off-by: Beni Lev <beni.lev@intel.com>
This commit is contained in:
Beni Lev 2017-08-21 19:43:53 +03:00 committed by Jouni Malinen
parent 19677b77c3
commit 076f1ea1d9
7 changed files with 66 additions and 6 deletions

View file

@ -4156,6 +4156,10 @@ static int hostapd_config_fill(struct hostapd_config *conf,
}
bss->multi_ap = val;
} else if (os_strcmp(buf, "rssi_reject_assoc_rssi") == 0) {
conf->rssi_reject_assoc_rssi = atoi(pos);
} else if (os_strcmp(buf, "rssi_reject_assoc_timeout") == 0) {
conf->rssi_reject_assoc_timeout = atoi(pos);
} else {
wpa_printf(MSG_ERROR,
"Line %d: unknown configuration item '%s'",

View file

@ -2295,6 +2295,21 @@ own_ip_addr=127.0.0.1
# Default is 0 = OCE disabled
#oce=0
# RSSI-based assocition rejection
#
# Reject STA association if RSSI is below given threshold (in dBm)
# Allowed range: -60 to -90 dBm; default = 0 (rejection disabled)
# Note: This rejection happens based on a signal strength detected while
# receiving a single frame and as such, there is significant risk of the value
# not being accurate and this resulting in valid stations being rejected. As
# such, this functionality is not recommended to be used for purposes other than
# testing.
#rssi_reject_assoc_rssi=-75
#
# Association retry delay in seconds allowed by the STA if RSSI has not met the
# threshold (range: 0..255, default=30).
#rssi_reject_assoc_timeout=30
##### Fast Session Transfer (FST) support #####################################
#
# The options in this section are only available when the build configuration

View file

@ -241,6 +241,9 @@ struct hostapd_config * hostapd_config_defaults(void)
* environments for the current frequency band in the country. */
conf->country[2] = ' ';
conf->rssi_reject_assoc_rssi = 0;
conf->rssi_reject_assoc_timeout = 30;
return conf;
}

View file

@ -849,6 +849,9 @@ struct hostapd_config {
#define CH_SWITCH_VHT_ENABLED BIT(0)
#define CH_SWITCH_VHT_DISABLED BIT(1)
unsigned int ch_switch_vht_config;
int rssi_reject_assoc_rssi;
int rssi_reject_assoc_timeout;
};

View file

@ -2976,7 +2976,7 @@ static int add_associated_sta(struct hostapd_data *hapd,
static u16 send_assoc_resp(struct hostapd_data *hapd, struct sta_info *sta,
const u8 *addr, u16 status_code, int reassoc,
const u8 *ies, size_t ies_len)
const u8 *ies, size_t ies_len, int rssi)
{
int send_len;
u8 *buf;
@ -3021,6 +3021,16 @@ static u16 send_assoc_resp(struct hostapd_data *hapd, struct sta_info *sta,
/* Extended supported rates */
p = hostapd_eid_ext_supp_rates(hapd, p);
#ifdef CONFIG_MBO
if (status_code == WLAN_STATUS_DENIED_POOR_CHANNEL_CONDITIONS &&
rssi != 0) {
int delta = hapd->iconf->rssi_reject_assoc_rssi - rssi;
p = hostapd_eid_mbo_rssi_assoc_rej(hapd, p, buf + buflen - p,
delta);
}
#endif /* CONFIG_MBO */
#ifdef CONFIG_IEEE80211R_AP
if (sta && status_code == WLAN_STATUS_SUCCESS) {
/* IEEE 802.11r: Mobility Domain Information, Fast BSS
@ -3292,7 +3302,7 @@ void fils_hlp_finish_assoc(struct hostapd_data *hapd, struct sta_info *sta)
reply_res = send_assoc_resp(hapd, sta, sta->addr, WLAN_STATUS_SUCCESS,
sta->fils_pending_assoc_is_reassoc,
sta->fils_pending_assoc_req,
sta->fils_pending_assoc_req_len);
sta->fils_pending_assoc_req_len, 0);
os_free(sta->fils_pending_assoc_req);
sta->fils_pending_assoc_req = NULL;
sta->fils_pending_assoc_req_len = 0;
@ -3329,7 +3339,7 @@ void fils_hlp_timeout(void *eloop_ctx, void *eloop_data)
static void handle_assoc(struct hostapd_data *hapd,
const struct ieee80211_mgmt *mgmt, size_t len,
int reassoc)
int reassoc, int rssi)
{
u16 capab_info, listen_interval, seq_ctrl, fc;
u16 resp = WLAN_STATUS_SUCCESS, reply_res;
@ -3512,6 +3522,12 @@ static void handle_assoc(struct hostapd_data *hapd,
resp = WLAN_STATUS_AP_UNABLE_TO_HANDLE_NEW_STA;
goto fail;
}
if (hapd->iconf->rssi_reject_assoc_rssi && rssi &&
rssi < hapd->iconf->rssi_reject_assoc_rssi) {
resp = WLAN_STATUS_DENIED_POOR_CHANNEL_CONDITIONS;
goto fail;
}
#endif /* CONFIG_MBO */
/*
@ -3710,7 +3726,7 @@ static void handle_assoc(struct hostapd_data *hapd,
#endif /* CONFIG_FILS */
reply_res = send_assoc_resp(hapd, sta, mgmt->sa, resp, reassoc, pos,
left);
left, rssi);
os_free(tmp);
/*
@ -4155,12 +4171,12 @@ int ieee802_11_mgmt(struct hostapd_data *hapd, const u8 *buf, size_t len,
break;
case WLAN_FC_STYPE_ASSOC_REQ:
wpa_printf(MSG_DEBUG, "mgmt::assoc_req");
handle_assoc(hapd, mgmt, len, 0);
handle_assoc(hapd, mgmt, len, 0, ssi_signal);
ret = 1;
break;
case WLAN_FC_STYPE_REASSOC_REQ:
wpa_printf(MSG_DEBUG, "mgmt::reassoc_req");
handle_assoc(hapd, mgmt, len, 1);
handle_assoc(hapd, mgmt, len, 1, ssi_signal);
ret = 1;
break;
case WLAN_FC_STYPE_DISASSOC:

View file

@ -122,6 +122,9 @@ u8 * hostapd_eid_mbo(struct hostapd_data *hapd, u8 *eid, size_t len);
u8 hostapd_mbo_ie_len(struct hostapd_data *hapd);
u8 * hostapd_eid_mbo_rssi_assoc_rej(struct hostapd_data *hapd, u8 *eid,
size_t len, int delta);
#else /* CONFIG_MBO */
static inline u8 * hostapd_eid_mbo(struct hostapd_data *hapd, u8 *eid,

View file

@ -682,6 +682,22 @@ u8 * hostapd_eid_bss_max_idle_period(struct hostapd_data *hapd, u8 *eid)
#ifdef CONFIG_MBO
u8 * hostapd_eid_mbo_rssi_assoc_rej(struct hostapd_data *hapd, u8 *eid,
size_t len, int delta)
{
u8 mbo[4];
mbo[0] = OCE_ATTR_ID_RSSI_BASED_ASSOC_REJECT;
mbo[1] = 2;
/* Delta RSSI */
mbo[2] = delta;
/* Retry delay */
mbo[3] = hapd->iconf->rssi_reject_assoc_timeout;
return eid + mbo_add_ie(eid, len, mbo, 4);
}
u8 * hostapd_eid_mbo(struct hostapd_data *hapd, u8 *eid, size_t len)
{
u8 mbo[9], *mbo_pos = mbo;