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nl80211: Add driver capability for GTK_NOT_USED

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Many drivers support operation without GTK configured, but most (if any)
today do not advertise this. Handle this by skipping GTK cipher suite
configuration if the driver did not advertise support in order to work
around cfg80211 validation steps.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Jouni Malinen 2014-01-27 19:11:15 +02:00 • committed by Jouni Malinen
parent 2c49d04cdb
commit ae6f927258
2 changed files with 14 additions and 1 deletions
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14
src/drivers/driver_nl80211.c
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@ -3525,6 +3525,9 @@ static void wiphy_info_cipher_suites(struct wiphy_info_data *info,
case WLAN_CIPHER_SUITE_BIP_CMAC_256:
info->capa->enc |= WPA_DRIVER_CAPA_ENC_BIP_CMAC_256;
break;
case WLAN_CIPHER_SUITE_NO_GROUP_ADDR:
info->capa->enc |= WPA_DRIVER_CAPA_ENC_GTK_NOT_USED;
break;
}
}
}
@ -5511,6 +5514,8 @@ static u32 wpa_cipher_to_cipher_suite(unsigned int cipher)
return WLAN_CIPHER_SUITE_WEP104;
case WPA_CIPHER_WEP40:
return WLAN_CIPHER_SUITE_WEP40;
case WPA_CIPHER_GTK_NOT_USED:
return WLAN_CIPHER_SUITE_NO_GROUP_ADDR;
}
return 0;
@ -8470,7 +8475,14 @@ static int nl80211_connect_common(struct wpa_driver_nl80211_data *drv,
NLA_PUT_U32(msg, NL80211_ATTR_CIPHER_SUITES_PAIRWISE, cipher);
}
if (params->group_suite != WPA_CIPHER_NONE) {
if (params->group_suite == WPA_CIPHER_GTK_NOT_USED &&
!(drv->capa.enc & WPA_DRIVER_CAPA_ENC_GTK_NOT_USED)) {
/*
* This is likely to work even though many drivers do not
* advertise support for operations without GTK.
*/
wpa_printf(MSG_DEBUG, " * skip group cipher configuration for GTK_NOT_USED due to missing driver support advertisement");
} else if (params->group_suite != WPA_CIPHER_NONE) {
u32 cipher = wpa_cipher_to_cipher_suite(params->group_suite);
wpa_printf(MSG_DEBUG, " * group=0x%x", cipher);
NLA_PUT_U32(msg, NL80211_ATTR_CIPHER_SUITE_GROUP, cipher);