From patchwork Wed Sep 8 06:52:02 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Subrat Mishra X-Patchwork-Id: 508241 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 309F3C433F5 for ; Wed, 8 Sep 2021 06:52:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 159C461108 for ; Wed, 8 Sep 2021 06:52:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237239AbhIHGx5 (ORCPT ); Wed, 8 Sep 2021 02:53:57 -0400 Received: from m43-7.mailgun.net ([69.72.43.7]:54664 "EHLO m43-7.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347844AbhIHGx4 (ORCPT ); Wed, 8 Sep 2021 02:53:56 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1631083969; h=Message-Id: Date: Subject: Cc: To: From: Sender; bh=4ComFDH4pRgFVNF7I/lbDBeEjfrqcJGOv45xw9dj6Ck=; b=Z8db+m/jXXrAMAYj664A+JKSn3IH24MTnKAS6CBKgl2U/IlktBRn78H3zmEnxrdg2kf/cSHk UOx7roGqpHYcRGq/9V1g+ZrPsL2GWWuBBVVS1mOaf4g9RmjXle1AhNvf2eVP09+AEyE/qqXC VDaBl4oOH0+8ay7Oj3/BE7y9V5o= X-Mailgun-Sending-Ip: 69.72.43.7 X-Mailgun-Sid: WyI3YTAwOSIsICJsaW51eC13aXJlbGVzc0B2Z2VyLmtlcm5lbC5vcmciLCAiYmU5ZTRhIl0= Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n05.prod.us-west-2.postgun.com with SMTP id 61385db64cd9015037969328 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Wed, 08 Sep 2021 06:52:38 GMT Sender: subratm=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 22025C43460; Wed, 8 Sep 2021 06:52:38 +0000 (UTC) Received: from blr-ubuntu-subratm.qualcomm.com (blr-bdr-fw-01_GlobalNAT_AllZones-Outside.qualcomm.com [103.229.18.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: subratm) by smtp.codeaurora.org (Postfix) with ESMTPSA id C9E54C43616; Wed, 8 Sep 2021 06:52:35 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 smtp.codeaurora.org C9E54C43616 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=codeaurora.org From: Subrat Mishra To: linux-wireless@vger.kernel.org, ath11k@lists.infradead.org Cc: Subrat Mishra Subject: [PATCH] cfg80211: AP mode driver offload for FILS association crypto Date: Wed, 8 Sep 2021 12:22:02 +0530 Message-Id: <1631083922-24136-1-git-send-email-subratm@codeaurora.org> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Add a driver FILS crypto offload extended capability flag to indicate that the driver running in AP mode is capable of handling encryption and decryption of (Re)Association request and response frames. Add a command to set FILS AAD data to driver. This feature is supported on drivers running in AP mode only. This extended capability is exchanged with hostapd during cfg80211 init. If the driver indicates this capability, then before sending the Authentication response frame, hostapd sets FILS AAD data to the driver. This allows the driver to decrypt (Re)Association Request frame and encrypt (Re)Association Response frame. FILS Key derivation will still be done in hostapd. Signed-off-by: Subrat Mishra diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index 62dd842..48b9027 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -740,6 +740,22 @@ struct cfg80211_tid_config { }; /** + * struct cfg80211_fils_aad - FILS AAD data + * @macaddr: STA MAC address + * @kek: FILS KEK + * @kek_len: FILS KEK length + * @snonce: STA Nonce + * @anonce: AP Nonce + */ +struct cfg80211_fils_aad { + const u8 *macaddr; + const u8 *kek; + u8 kek_len; + const u8 *snonce; + const u8 *anonce; +} + +/** * cfg80211_get_chandef_type - return old channel type from chandef * @chandef: the channel definition * @@ -4018,6 +4034,10 @@ struct mgmt_frame_regs { * @set_sar_specs: Update the SAR (TX power) settings. * * @color_change: Initiate a color change. + * + * @set_fils_aad: Set FILS AAD data to the AP driver so that the driver can use + * those to decrypt (Re)Association Request and encrypt (Re)Association + * Response frame. */ struct cfg80211_ops { int (*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow); @@ -4348,6 +4368,8 @@ struct cfg80211_ops { int (*color_change)(struct wiphy *wiphy, struct net_device *dev, struct cfg80211_color_change_settings *params); + int (*set_fils_aad)(struct wiphy *wiphy, struct net_device *dev, + struct cfg80211_fils_aad *fils_aad); }; /* diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h index c2efea9..e89bbf8 100644 --- a/include/uapi/linux/nl80211.h +++ b/include/uapi/linux/nl80211.h @@ -301,6 +301,29 @@ */ /** + * DOC: FILS shared key crypto offload + * + * This feature is applicable to drivers running in AP mode. + * + * FILS shared key crypto offload can be advertised by drivers by setting + * @NL80211_EXT_FEATURE_FILS_CRYPTO_OFFLOAD flag. The drivers that support + * FILS shared key crypto offload should be able to encrypt and decrypt + * association frames for FILS shared key authentication as per IEEE 802.11ai. + * With this capability, for FILS key derivation, drivers depend on userspace. + * + * After FILS key derivation, userspace shares the FILS AAD details with the + * driver and the driver stores the same to use in decryption of association + * request and in encryption of association response. The below parameters + * should be given to the driver in %NL80211_CMD_SET_FILS_AAD. + * %NL80211_ATTR_MAC - STA MAC address, used for storing FILS AAD per STA + * %NL80211_ATTR_FILS_KEK - Used for encryption or decryption + * %NL80211_ATTR_FILS_NONCES - Used for encryption or decryption + * (STA Nonce 16 bytes followed by AP Nonce 16 bytes) + * + * Once the association is done, the driver cleans the FILS AAD data. + */ + +/** * enum nl80211_commands - supported nl80211 commands * * @NL80211_CMD_UNSPEC: unspecified command to catch errors @@ -1200,6 +1223,12 @@ * @NL80211_CMD_COLOR_CHANGE_COMPLETED: Notify userland that the color change * has completed * + * @NL80211_CMD_SET_FILS_AAD: Set FILS AAD data to the driver using - + * &NL80211_ATTR_MAC - for STA MAC address + * &NL80211_ATTR_FILS_KEK - for KEK + * &NL80211_ATTR_FILS_NONCES - for FILS Nonces + * (STA Nonce 16 bytes followed by AP Nonce 16 bytes) + * * @NL80211_CMD_MAX: highest used command number * @__NL80211_CMD_AFTER_LAST: internal use */ @@ -1440,6 +1469,8 @@ enum nl80211_commands { NL80211_CMD_COLOR_CHANGE_ABORTED, NL80211_CMD_COLOR_CHANGE_COMPLETED, + NL80211_CMD_SET_FILS_AAD, + /* add new commands above here */ /* used to define NL80211_CMD_MAX below */ @@ -5995,6 +6026,11 @@ enum nl80211_feature_flags { * @NL80211_EXT_FEATURE_BSS_COLOR: The driver supports BSS color collision * detection and change announcemnts. * + * @NL80211_EXT_FEATURE_FILS_CRYPTO_OFFLOAD: Driver running in AP mode supports + * FILS encryption and decryption for (Re)Association Request and Response + * frames. Userspace has to share FILS AAD details to the driver by using + * @NL80211_CMD_SET_FILS_AAD. + * * @NUM_NL80211_EXT_FEATURES: number of extended features. * @MAX_NL80211_EXT_FEATURES: highest extended feature index. */ @@ -6060,6 +6096,7 @@ enum nl80211_ext_feature_index { NL80211_EXT_FEATURE_SECURE_RTT, NL80211_EXT_FEATURE_PROT_RANGE_NEGO_AND_MEASURE, NL80211_EXT_FEATURE_BSS_COLOR, + NL80211_EXT_FEATURE_FILS_CRYPTO_OFFLOAD, /* add new features before the definition below */ NUM_NL80211_EXT_FEATURES, diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index bf7cd47..e287ee5 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -14904,6 +14904,29 @@ static int nl80211_color_change(struct sk_buff *skb, struct genl_info *info) return err; } +static int nl80211_set_fils_aad(struct sk_buff *skb, + struct genl_info *info) +{ + struct cfg80211_registered_device *rdev = info->user_ptr[0]; + struct net_device *dev = info->user_ptr[1]; + struct cfg80211_fils_aad fils_aad = {}; + u8 *nonces; + + if (!info->attrs[NL80211_ATTR_MAC] || + !info->attrs[NL80211_ATTR_FILS_KEK] || + !info->attrs[NL80211_ATTR_FILS_NONCES]) + return -EINVAL; + + fils_aad.macaddr = nla_data(info->attrs[NL80211_ATTR_MAC]); + fils_aad.kek_len = nla_len(info->attrs[NL80211_ATTR_FILS_KEK]); + fils_aad.kek = nla_data(info->attrs[NL80211_ATTR_FILS_KEK]); + nonces = nla_data(info->attrs[NL80211_ATTR_FILS_NONCES]); + fils_aad.snonce = nonces; + fils_aad.anonce = nonces + FILS_NONCE_LEN; + + return rdev_set_fils_aad(rdev, dev, &fils_aad); +} + #define NL80211_FLAG_NEED_WIPHY 0x01 #define NL80211_FLAG_NEED_NETDEV 0x02 #define NL80211_FLAG_NEED_RTNL 0x04 @@ -15907,6 +15930,14 @@ static const struct genl_small_ops nl80211_small_ops[] = { .internal_flags = NL80211_FLAG_NEED_NETDEV_UP | NL80211_FLAG_NEED_RTNL, }, + { + .cmd = NL80211_CMD_SET_FILS_AAD, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .doit = nl80211_set_fils_aad, + .flags = GENL_UNS_ADMIN_PERM, + .internal_flags = NL80211_FLAG_NEED_NETDEV_UP | + NL80211_FLAG_NEED_RTNL, + }, }; static struct genl_family nl80211_fam __ro_after_init = { diff --git a/net/wireless/rdev-ops.h b/net/wireless/rdev-ops.h index ce6bf21..cc1efec 100644 --- a/net/wireless/rdev-ops.h +++ b/net/wireless/rdev-ops.h @@ -1381,4 +1381,18 @@ static inline int rdev_color_change(struct cfg80211_registered_device *rdev, return ret; } +static inline int +rdev_set_fils_aad(struct cfg80211_registered_device *rdev, + struct net_device *dev, struct cfg80211_fils_aad *fils_aad) +{ + int ret = -EOPNOTSUPP; + + trace_rdev_set_fils_aad(&rdev->wiphy, dev, fils_aad); + if (rdev->ops->set_fils_aad) + ret = rdev->ops->set_fils_aad(&rdev->wiphy, dev, fils_aad); + trace_rdev_return_int(&rdev->wiphy, ret); + + return ret; +} + #endif /* __CFG80211_RDEV_OPS */ diff --git a/net/wireless/trace.h b/net/wireless/trace.h index 19b78d4..b6eb23b 100644 --- a/net/wireless/trace.h +++ b/net/wireless/trace.h @@ -167,6 +167,19 @@ __entry->center_freq1, __entry->freq1_offset, \ __entry->center_freq2 +#define FILS_AAD_ASSIGN(fa) \ + do { \ + if (fa) { \ + ether_addr_copy(__entry->macaddr, fa->macaddr); \ + __entry->kek_len = fa->kek_len; \ + } else { \ + eth_zero_addr(__entry->macaddr); \ + __entry->kek_len = 0; \ + } \ + } while (0) +#define FILS_AAD_PR_FMT \ + "macaddr: %pM, kek_len: %d" + #define SINFO_ENTRY __field(int, generation) \ __field(u32, connected_time) \ __field(u32, inactive_time) \ @@ -2614,6 +2627,24 @@ DEFINE_EVENT(wiphy_wdev_cookie_evt, rdev_abort_pmsr, TP_ARGS(wiphy, wdev, cookie) ); +TRACE_EVENT(rdev_set_fils_aad, + TP_PROTO(struct wiphy *wiphy, struct net_device *netdev, + struct cfg80211_fils_aad *fils_aad), + TP_ARGS(wiphy, netdev, fils_aad), + TP_STRUCT__entry(WIPHY_ENTRY + NETDEV_ENTRY + __array(u8, macaddr, ETH_ALEN) + __field(u8, kek_len) + ), + TP_fast_assign(WIPHY_ASSIGN; + NETDEV_ASSIGN; + FILS_AAD_ASSIGN(fils_aad); + ), + TP_printk(WIPHY_PR_FMT ", " NETDEV_PR_FMT ", " FILS_AAD_PR_FMT, + WIPHY_PR_ARG, NETDEV_PR_ARG, __entry->macaddr, + __entry->kek_len) +); + /************************************************************* * cfg80211 exported functions traces * *************************************************************/