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hostapd: Allow coexistance of HT BSSes with WEP/TKIP BSSes

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In multi BSS setups it wasn't possible to set up an HT BSS in
conjunction with a WEP/TKIP BSS. HT needed to be turned off entirely
to allow WEP/TKIP BSSes to be used.

In order to allow HT BSSes to coexist with non-HT WEP/TKIP BSSes add a
new BSS conf attribute "disable_11n" which disables HT capabilities on a
single BSS by suppressing HT IEs in the beacon and probe response
frames. Furthermore, mark all STAs associated to a WEP/TKIP BSS as
non-HT STAs. The disable_11n parameter is used internally; no new entry
is parsed from hostapd.conf.

This allows a non-HT WEP/TKIP BSS to coexist with a HT BSS without
having to disable HT mode entirely. Nevertheless, all STAs associated to
the WEP/TKIP BSS will only be served as if they were non-HT STAs.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
This commit is contained in:
Helmut Schaa 2011-02-21 17:27:16 +02:00 committed by Jouni Malinen
parent 16a83d2965
commit f39b07d7ed
5 changed files with 17 additions and 12 deletions
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9
hostapd/config_file.c
View file

@ -1090,17 +1090,18 @@ static int hostapd_config_check_bss(struct hostapd_bss_config *bss,
#ifdef CONFIG_IEEE80211N
if (conf->ieee80211n &&
bss->ssid.security_policy == SECURITY_STATIC_WEP) {
bss->disable_11n = 1;
wpa_printf(MSG_ERROR, "HT (IEEE 802.11n) with WEP is not "
"allowed");
return -1;
"allowed, disabling HT capabilities");
}
if (conf->ieee80211n && bss->wpa &&
!(bss->wpa_pairwise & WPA_CIPHER_CCMP) &&
!(bss->rsn_pairwise & WPA_CIPHER_CCMP)) {
bss->disable_11n = 1;
wpa_printf(MSG_ERROR, "HT (IEEE 802.11n) with WPA/WPA2 "
"requires CCMP to be enabled");
return -1;
"requires CCMP to be enabled, disabling HT "
"capabilities");
}
#endif /* CONFIG_IEEE80211N */

1
src/ap/ap_config.h
View file

@ -328,6 +328,7 @@ struct hostapd_bss_config {
#define TDLS_PROHIBIT BIT(0)
#define TDLS_PROHIBIT_CHAN_SWITCH BIT(1)
int tdls;
int disable_11n;
};

2
src/ap/ieee802_11.c
View file

@ -675,7 +675,7 @@ static u16 check_assoc_ies(struct hostapd_data *hapd, struct sta_info *sta,
if (resp != WLAN_STATUS_SUCCESS)
return resp;
#ifdef CONFIG_IEEE80211N
resp = copy_sta_ht_capab(sta, elems.ht_capabilities,
resp = copy_sta_ht_capab(hapd, sta, elems.ht_capabilities,
elems.ht_capabilities_len);
if (resp != WLAN_STATUS_SUCCESS)
return resp;

4
src/ap/ieee802_11.h
View file

@ -57,8 +57,8 @@ void ieee802_11_send_sa_query_req(struct hostapd_data *hapd,
void hostapd_get_ht_capab(struct hostapd_data *hapd,
struct ieee80211_ht_capabilities *ht_cap,
struct ieee80211_ht_capabilities *neg_ht_cap);
u16 copy_sta_ht_capab(struct sta_info *sta, const u8 *ht_capab,
size_t ht_capab_len);
u16 copy_sta_ht_capab(struct hostapd_data *hapd, struct sta_info *sta,
const u8 *ht_capab, size_t ht_capab_len);
void update_ht_state(struct hostapd_data *hapd, struct sta_info *sta);
void hostapd_tx_status(struct hostapd_data *hapd, const u8 *addr,
const u8 *buf, size_t len, int ack);

13
src/ap/ieee802_11_ht.c
View file

@ -30,7 +30,8 @@ u8 * hostapd_eid_ht_capabilities(struct hostapd_data *hapd, u8 *eid)
struct ieee80211_ht_capabilities *cap;
u8 *pos = eid;
if (!hapd->iconf->ieee80211n || !hapd->iface->current_mode)
if (!hapd->iconf->ieee80211n || !hapd->iface->current_mode ||
hapd->conf->disable_11n)
return eid;
*pos++ = WLAN_EID_HT_CAP;
@ -58,7 +59,7 @@ u8 * hostapd_eid_ht_operation(struct hostapd_data *hapd, u8 *eid)
struct ieee80211_ht_operation *oper;
u8 *pos = eid;
if (!hapd->iconf->ieee80211n)
if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n)
return eid;
*pos++ = WLAN_EID_HT_OPERATION;
@ -160,11 +161,13 @@ int hostapd_ht_operation_update(struct hostapd_iface *iface)
}
u16 copy_sta_ht_capab(struct sta_info *sta, const u8 *ht_capab,
size_t ht_capab_len)
u16 copy_sta_ht_capab(struct hostapd_data *hapd, struct sta_info *sta,
const u8 *ht_capab, size_t ht_capab_len)
{
/* Disable HT caps for STAs associated to no-HT BSSes. */
if (!ht_capab ||
ht_capab_len < sizeof(struct ieee80211_ht_capabilities)) {
ht_capab_len < sizeof(struct ieee80211_ht_capabilities) ||
hapd->conf->disable_11n) {
sta->flags &= ~WLAN_STA_HT;
os_free(sta->ht_capabilities);
sta->ht_capabilities = NULL;