From: Eliad Peller <[email protected]> Let drivers advertise support for station-mode 4-way handshake offloading with a new NL80211_EXT_FEATURE_4WAY_HANDSHAKE_OFFLOAD_STA flag.
Add a new NL80211_ATTR_PMK attribute that might be passed as part of NL80211_CMD_CONNECT command, and contain the PSK (which is the PMK, hence the name.) The driver/device is assumed to handle the 4-way handshake by itself in this case (including key derivations, etc.), instead of relying on the supplicant. This patch is somewhat based on this one (by Vladimir Kondratiev): https://patchwork.kernel.org/patch/1309561/. Signed-off-by: Vladimir Kondratiev <[email protected]> Signed-off-by: Eliad Peller <[email protected]> Signed-off-by: Luca Coelho <[email protected]> Signed-off-by: Johannes Berg <[email protected]> --- include/linux/ieee80211.h | 1 + include/net/cfg80211.h | 2 ++ include/uapi/linux/nl80211.h | 9 +++++++++ net/wireless/nl80211.c | 8 ++++++++ 4 files changed, 20 insertions(+) diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h index 6ea381c98aae..2049e983a994 100644 --- a/include/linux/ieee80211.h +++ b/include/linux/ieee80211.h @@ -2357,6 +2357,7 @@ enum ieee80211_sa_query_action { #define WLAN_MAX_KEY_LEN 32 #define WLAN_PMKID_LEN 16 +#define WLAN_PMK_LEN 32 #define WLAN_OUI_WFA 0x506f9a #define WLAN_OUI_TYPE_WFA_P2P 9 diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index 86c12f85fb53..4ca968927d60 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -643,6 +643,7 @@ struct survey_info { * @wep_keys: static WEP keys, if not NULL points to an array of * CFG80211_MAX_WEP_KEYS WEP keys * @wep_tx_key: key index (0..3) of the default TX static WEP key + * @psk: PSK (for devices supporting 4-way-handshake offload) */ struct cfg80211_crypto_settings { u32 wpa_versions; @@ -656,6 +657,7 @@ struct cfg80211_crypto_settings { bool control_port_no_encrypt; struct key_params *wep_keys; int wep_tx_key; + const u8 *psk; }; /** diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h index 9a499b15cfbc..bb5e1904a107 100644 --- a/include/uapi/linux/nl80211.h +++ b/include/uapi/linux/nl80211.h @@ -2012,6 +2012,9 @@ enum nl80211_commands { * u32 attribute with an &enum nl80211_timeout_reason value. This is used, * e.g., with %NL80211_CMD_CONNECT event. * + * @NL80211_ATTR_PMK: PSK for offloaded 4-Way Handshake. Relevant only + * with %NL80211_CMD_CONNECT (for WPA/WPA2-PSK networks). + * * @NUM_NL80211_ATTR: total number of nl80211_attrs available * @NL80211_ATTR_MAX: highest attribute number currently defined * @__NL80211_ATTR_AFTER_LAST: internal use @@ -2423,6 +2426,8 @@ enum nl80211_attrs { NL80211_ATTR_TIMEOUT_REASON, + NL80211_ATTR_PMK, + /* add attributes here, update the policy in nl80211.c */ __NL80211_ATTR_AFTER_LAST, @@ -4759,6 +4764,9 @@ enum nl80211_feature_flags { * @NL80211_EXT_FEATURE_CQM_RSSI_LIST: With this driver the * %NL80211_ATTR_CQM_RSSI_THOLD attribute accepts a list of zero or more * RSSI threshold values to monitor rather than exactly one threshold. + * @NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_PSK: Device supports doing 4-way + * handshake with PSK in station mode (PSK is passed as part of the connect + * and associate commands). * * @NUM_NL80211_EXT_FEATURES: number of extended features. * @MAX_NL80211_EXT_FEATURES: highest extended feature index. @@ -4778,6 +4786,7 @@ enum nl80211_ext_feature_index { NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA_CONNECTED, NL80211_EXT_FEATURE_SCHED_SCAN_RELATIVE_RSSI, NL80211_EXT_FEATURE_CQM_RSSI_LIST, + NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_PSK, /* add new features before the definition below */ NUM_NL80211_EXT_FEATURES, diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index d516527fcb8e..494b50b3eb71 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -410,6 +410,7 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = { .len = sizeof(struct nl80211_bss_select_rssi_adjust) }, [NL80211_ATTR_TIMEOUT_REASON] = { .type = NLA_U32 }, + [NL80211_ATTR_PMK] = { .len = WLAN_PMK_LEN }, }; /* policy for the key attributes */ @@ -8039,6 +8040,13 @@ static int nl80211_crypto_settings(struct cfg80211_registered_device *rdev, memcpy(settings->akm_suites, data, len); } + if (info->attrs[NL80211_ATTR_PMK]) { + if (!wiphy_ext_feature_isset(&rdev->wiphy, + NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_PSK)) + return -EINVAL; + settings->psk = nla_data(info->attrs[NL80211_ATTR_PMK]); + } + return 0; } -- 2.9.3
