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Mon, 17 Aug 2020 07:33:35 +0000 From: Chung-Hsien Hsu To: linux-wireless@vger.kernel.org, Johannes Berg Cc: brcm80211-dev-list@broadcom.com, brcm80211-dev-list@cypress.com, Arend van Spriel , Franky Lin , Hante Meuleman , Chi-Hsien Lin , Wright Feng , Kalle Valo , Chung-Hsien Hsu Subject: [PATCH v2 1/4] nl80211: support 4-way handshake offloading for WPA/WPA2-PSK in AP mode Date: Mon, 17 Aug 2020 02:33:13 -0500 Message-Id: <20200817073316.33402-2-stanley.hsu@cypress.com> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200817073316.33402-1-stanley.hsu@cypress.com> References: <20200817073316.33402-1-stanley.hsu@cypress.com> X-ClientProxiedBy: MN2PR15CA0023.namprd15.prod.outlook.com (2603:10b6:208:1b4::36) To BN6PR06MB3043.namprd06.prod.outlook.com (2603:10b6:404:5a::23) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from aremote06.aus.cypress.com (157.95.12.33) by MN2PR15CA0023.namprd15.prod.outlook.com (2603:10b6:208:1b4::36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3283.16 via Frontend Transport; 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Extend use of NL80211_ATTR_PMK attribute indicating it might be passed as part of NL80211_CMD_START_AP command, and contain the PSK (which is the PMK, hence the name). The driver is assumed to handle the 4-way handshake by itself in this case, instead of relying on user space. Signed-off-by: Chung-Hsien Hsu Signed-off-by: Chi-Hsien Lin --- include/uapi/linux/nl80211.h | 41 ++++++++++++++++++++++++------------ net/wireless/nl80211.c | 4 +++- 2 files changed, 31 insertions(+), 14 deletions(-) diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h index 4e6339ab1fce..0d267ac3858c 100644 --- a/include/uapi/linux/nl80211.h +++ b/include/uapi/linux/nl80211.h @@ -183,18 +183,27 @@ * * By setting @NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_PSK flag drivers * can indicate they support offloading EAPOL handshakes for WPA/WPA2 - * preshared key authentication. In %NL80211_CMD_CONNECT the preshared - * key should be specified using %NL80211_ATTR_PMK. Drivers supporting - * this offload may reject the %NL80211_CMD_CONNECT when no preshared - * key material is provided, for example when that driver does not - * support setting the temporal keys through %CMD_NEW_KEY. + * preshared key authentication in station mode. In %NL80211_CMD_CONNECT + * the preshared key should be specified using %NL80211_ATTR_PMK. Drivers + * supporting this offload may reject the %NL80211_CMD_CONNECT when no + * preshared key material is provided, for example when that driver does + * not support setting the temporal keys through %NL80211_CMD_NEW_KEY. * * Similarly @NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X flag can be * set by drivers indicating offload support of the PTK/GTK EAPOL - * handshakes during 802.1X authentication. In order to use the offload - * the %NL80211_CMD_CONNECT should have %NL80211_ATTR_WANT_1X_4WAY_HS - * attribute flag. Drivers supporting this offload may reject the - * %NL80211_CMD_CONNECT when the attribute flag is not present. + * handshakes during 802.1X authentication in station mode. In order to + * use the offload the %NL80211_CMD_CONNECT should have + * %NL80211_ATTR_WANT_1X_4WAY_HS attribute flag. Drivers supporting this + * offload may reject the %NL80211_CMD_CONNECT when the attribute flag is + * not present. + * + * By setting @NL80211_EXT_FEATURE_4WAY_HANDSHAKE_AP_PSK flag drivers + * can indicate they support offloading EAPOL handshakes for WPA/WPA2 + * preshared key authentication in AP mode. In %NL80211_CMD_START_AP + * the preshared key should be specified using %NL80211_ATTR_PMK. Drivers + * supporting this offload may reject the %NL80211_CMD_START_AP when no + * preshared key material is provided, for example when that driver does + * not support setting the temporal keys through %NL80211_CMD_NEW_KEY. * * For 802.1X the PMK or PMK-R0 are set by providing %NL80211_ATTR_PMK * using %NL80211_CMD_SET_PMK. For offloaded FT support also @@ -2362,10 +2371,11 @@ enum nl80211_commands { * * @NL80211_ATTR_PMK: attribute for passing PMK key material. Used with * %NL80211_CMD_SET_PMKSA for the PMKSA identified by %NL80211_ATTR_PMKID. - * For %NL80211_CMD_CONNECT it is used to provide PSK for offloading 4-way - * handshake for WPA/WPA2-PSK networks. For 802.1X authentication it is - * used with %NL80211_CMD_SET_PMK. For offloaded FT support this attribute - * specifies the PMK-R0 if NL80211_ATTR_PMKR0_NAME is included as well. + * For %NL80211_CMD_CONNECT and %NL80211_CMD_START_AP it is used to provide + * PSK for offloading 4-way handshake for WPA/WPA2-PSK networks. For 802.1X + * authentication it is used with %NL80211_CMD_SET_PMK. For offloaded FT + * support this attribute specifies the PMK-R0 if NL80211_ATTR_PMKR0_NAME + * is included as well. * * @NL80211_ATTR_SCHED_SCAN_MULTI: flag attribute which user-space shall use to * indicate that it supports multiple active scheduled scan requests. @@ -5773,6 +5783,10 @@ enum nl80211_feature_flags { * @NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211_TX_STATUS: The driver * can report tx status for control port over nl80211 tx operations. * + * @NL80211_EXT_FEATURE_4WAY_HANDSHAKE_AP_PSK: Device wants to do 4-way + * handshake with PSK in AP mode (PSK is passed as part of the start AP + * command). + * * @NUM_NL80211_EXT_FEATURES: number of extended features. * @MAX_NL80211_EXT_FEATURES: highest extended feature index. */ @@ -5828,6 +5842,7 @@ enum nl80211_ext_feature_index { NL80211_EXT_FEATURE_BEACON_PROTECTION_CLIENT, NL80211_EXT_FEATURE_SCAN_FREQ_KHZ, NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211_TX_STATUS, + NL80211_EXT_FEATURE_4WAY_HANDSHAKE_AP_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 0e07fb8585fb..8e7c6a022205 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -9438,7 +9438,9 @@ static int nl80211_crypto_settings(struct cfg80211_registered_device *rdev, if (nla_len(info->attrs[NL80211_ATTR_PMK]) != WLAN_PMK_LEN) return -EINVAL; if (!wiphy_ext_feature_isset(&rdev->wiphy, - NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_PSK)) + NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_PSK) && + !wiphy_ext_feature_isset(&rdev->wiphy, + NL80211_EXT_FEATURE_4WAY_HANDSHAKE_AP_PSK)) return -EINVAL; settings->psk = nla_data(info->attrs[NL80211_ATTR_PMK]); }