From patchwork Thu Dec 3 20:12:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Winkler X-Patchwork-Id: 11949533 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=-26.2 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable 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 8E2BDC433FE for ; Thu, 3 Dec 2020 20:15:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 46FBC221F2 for ; Thu, 3 Dec 2020 20:15:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731841AbgLCUOz (ORCPT ); Thu, 3 Dec 2020 15:14:55 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37350 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729671AbgLCUOs (ORCPT ); Thu, 3 Dec 2020 15:14:48 -0500 Received: from mail-qv1-xf49.google.com (mail-qv1-xf49.google.com [IPv6:2607:f8b0:4864:20::f49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 97517C08ED7E for ; Thu, 3 Dec 2020 12:13:16 -0800 (PST) Received: by mail-qv1-xf49.google.com with SMTP id e13so2622854qvl.19 for ; Thu, 03 Dec 2020 12:13:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=WF6DBRyA1nnkp0z+SQ9Etyfy61zs6qETUpirV+BAF1o=; b=i40/Qcl+Vhg3BL6xViK7rLAIziJwMDPiPNIvat0cxD7O2joCbKmZFO6SeLTVOioVQs vTvsLivLwktKPZU3ZwyJuLwTdUYIstpcY4srN0XsygfEnB1llojAkrg62k+jE8QlLN9c FaX4GUEu4nho81pzm+dGoBlURBTtoX/sVK5/HkDIYLAjvSQ4v9NZiwLR4NjBZeL94b3w NexCwg9P0nASGW8BhRkFF8Kgq2mi3v+6NLPiR7daE25ek5EmUeVFXw6o50VKNyMbjp/u 0gZYOq6DYW5V/Cs8G8oaKIQ8/g4xCDXPKxLUZEt7dLP4tKWJpZY3MtcUtFrYputGogVY r/6Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=WF6DBRyA1nnkp0z+SQ9Etyfy61zs6qETUpirV+BAF1o=; b=Ub1SbdH4THJUnOOg8rHxvit5R9w+t8Bcv2y3K7Y+hEC+giKAYWlFzIYt2Ka1xH5Wjr lOzgK+S145pKws8UCdTz40efBbo3fsLvUm+s2to80T1mjh2gszoaSZ7Nu0xfDS3RGztP 4cYnQqG8+zJdtGDZXW+EmN1GPtaaONXJtbG0ElQ1JnDPootpjpb7VHiX8V3031l+nn7X jBu1LoDz5hDvi5/RsFEh0oNpurTJGv+2fBrxrFgv1OUWNIEUuNoUrUEzre5JjcLK8T+F BHfE7xs3fRL5k7hkzTiGh5EfBfH+zJmE1S5Ju3kSTBE3QGbcntnLVfaSrf0rh+cqpX8K 2TUg== X-Gm-Message-State: AOAM532NpN6eK3mxfsyz8+H2J9cdTBfdnZ87M3h66f6x026o4Zra/a1c jAos4j1mn7ytdTI+gQ7v1FIc+qlpW0wrfFFM3Hty X-Google-Smtp-Source: ABdhPJymPiNuPuxQWhhq50s/Vukzmmvb/gJcJKlFT7YlC7yqG1ktHbbN5p8+yqNVse3E3PUMhZm5sGxIJZpwRFsCFWvM Sender: "danielwinkler via sendgmr" X-Received: from danielwinkler-linux.mtv.corp.google.com ([2620:15c:202:201:f693:9fff:fef4:4e59]) (user=danielwinkler job=sendgmr) by 2002:a0c:fa4f:: with SMTP id k15mr749911qvo.62.1607026395813; Thu, 03 Dec 2020 12:13:15 -0800 (PST) Date: Thu, 3 Dec 2020 12:12:52 -0800 In-Reply-To: <20201203201252.807616-1-danielwinkler@google.com> Message-Id: <20201203121154.v7.5.I5068c01cae3cea674a96e103a0cf4d8c81425a4f@changeid> Mime-Version: 1.0 References: <20201203201252.807616-1-danielwinkler@google.com> X-Mailer: git-send-email 2.29.2.576.ga3fc446d84-goog Subject: [PATCH v7 5/5] Bluetooth: Change MGMT security info CMD to be more generic From: Daniel Winkler To: marcel@holtmann.org Cc: linux-bluetooth@vger.kernel.org, chromeos-bluetooth-upstreaming@chromium.org, Daniel Winkler , Sonny Sasaka , "David S. Miller" , Jakub Kicinski , Johan Hedberg , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org For advertising, we wish to know the LE tx power capabilities of the controller in userspace, so this patch edits the Security Info MGMT command to be more generic, such that other various controller capabilities can be included in the EIR data. This change also includes the LE min and max tx power into this newly-named command. The change was tested by manually verifying that the MGMT command returns the tx power range as expected in userspace. Reviewed-by: Sonny Sasaka Signed-off-by: Daniel Winkler --- Changes in v7: - Rebase onto bluetooth-next/master Changes in v6: - Only populate LE tx power range if controller reports it Changes in v5: None Changes in v4: - Combine LE tx range into a single EIR field for MGMT capabilities cmd Changes in v3: - Re-using security info MGMT command to carry controller capabilities Changes in v2: - Fixed sparse error in Capabilities MGMT command include/net/bluetooth/mgmt.h | 15 ++++++++----- net/bluetooth/mgmt.c | 43 ++++++++++++++++++++++++------------ 2 files changed, 39 insertions(+), 19 deletions(-) diff --git a/include/net/bluetooth/mgmt.h b/include/net/bluetooth/mgmt.h index 2e18e4173e2fa5..f9a6638e20b3c6 100644 --- a/include/net/bluetooth/mgmt.h +++ b/include/net/bluetooth/mgmt.h @@ -686,11 +686,16 @@ struct mgmt_cp_set_blocked_keys { #define MGMT_OP_SET_WIDEBAND_SPEECH 0x0047 -#define MGMT_OP_READ_SECURITY_INFO 0x0048 -#define MGMT_READ_SECURITY_INFO_SIZE 0 -struct mgmt_rp_read_security_info { - __le16 sec_len; - __u8 sec[]; +#define MGMT_CAP_SEC_FLAGS 0x01 +#define MGMT_CAP_MAX_ENC_KEY_SIZE 0x02 +#define MGMT_CAP_SMP_MAX_ENC_KEY_SIZE 0x03 +#define MGMT_CAP_LE_TX_PWR 0x04 + +#define MGMT_OP_READ_CONTROLLER_CAP 0x0048 +#define MGMT_READ_CONTROLLER_CAP_SIZE 0 +struct mgmt_rp_read_controller_cap { + __le16 cap_len; + __u8 cap[0]; } __packed; #define MGMT_OP_READ_EXP_FEATURES_INFO 0x0049 diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c index 668a62c8181eb1..754489e4e0655c 100644 --- a/net/bluetooth/mgmt.c +++ b/net/bluetooth/mgmt.c @@ -110,7 +110,7 @@ static const u16 mgmt_commands[] = { MGMT_OP_SET_APPEARANCE, MGMT_OP_SET_BLOCKED_KEYS, MGMT_OP_SET_WIDEBAND_SPEECH, - MGMT_OP_READ_SECURITY_INFO, + MGMT_OP_READ_CONTROLLER_CAP, MGMT_OP_READ_EXP_FEATURES_INFO, MGMT_OP_SET_EXP_FEATURE, MGMT_OP_READ_DEF_SYSTEM_CONFIG, @@ -176,7 +176,7 @@ static const u16 mgmt_untrusted_commands[] = { MGMT_OP_READ_CONFIG_INFO, MGMT_OP_READ_EXT_INDEX_LIST, MGMT_OP_READ_EXT_INFO, - MGMT_OP_READ_SECURITY_INFO, + MGMT_OP_READ_CONTROLLER_CAP, MGMT_OP_READ_EXP_FEATURES_INFO, MGMT_OP_READ_DEF_SYSTEM_CONFIG, MGMT_OP_READ_DEF_RUNTIME_CONFIG, @@ -3710,13 +3710,14 @@ static int set_wideband_speech(struct sock *sk, struct hci_dev *hdev, return err; } -static int read_security_info(struct sock *sk, struct hci_dev *hdev, - void *data, u16 data_len) +static int read_controller_cap(struct sock *sk, struct hci_dev *hdev, + void *data, u16 data_len) { - char buf[16]; - struct mgmt_rp_read_security_info *rp = (void *)buf; - u16 sec_len = 0; + char buf[20]; + struct mgmt_rp_read_controller_cap *rp = (void *)buf; + u16 cap_len = 0; u8 flags = 0; + u8 tx_power_range[2]; bt_dev_dbg(hdev, "sock %p", sk); @@ -3740,23 +3741,37 @@ static int read_security_info(struct sock *sk, struct hci_dev *hdev, flags |= 0x08; /* Encryption key size enforcement (LE) */ - sec_len = eir_append_data(rp->sec, sec_len, 0x01, &flags, 1); + cap_len = eir_append_data(rp->cap, cap_len, MGMT_CAP_SEC_FLAGS, + &flags, 1); /* When the Read Simple Pairing Options command is supported, then * also max encryption key size information is provided. */ if (hdev->commands[41] & 0x08) - sec_len = eir_append_le16(rp->sec, sec_len, 0x02, + cap_len = eir_append_le16(rp->cap, cap_len, + MGMT_CAP_MAX_ENC_KEY_SIZE, hdev->max_enc_key_size); - sec_len = eir_append_le16(rp->sec, sec_len, 0x03, SMP_MAX_ENC_KEY_SIZE); + cap_len = eir_append_le16(rp->cap, cap_len, + MGMT_CAP_SMP_MAX_ENC_KEY_SIZE, + SMP_MAX_ENC_KEY_SIZE); + + /* Append the min/max LE tx power parameters if we were able to fetch + * it from the controller + */ + if (hdev->commands[38] & 0x80) { + memcpy(&tx_power_range[0], &hdev->min_le_tx_power, 1); + memcpy(&tx_power_range[1], &hdev->max_le_tx_power, 1); + cap_len = eir_append_data(rp->cap, cap_len, MGMT_CAP_LE_TX_PWR, + tx_power_range, 2); + } - rp->sec_len = cpu_to_le16(sec_len); + rp->cap_len = cpu_to_le16(cap_len); hci_dev_unlock(hdev); - return mgmt_cmd_complete(sk, hdev->id, MGMT_OP_READ_SECURITY_INFO, 0, - rp, sizeof(*rp) + sec_len); + return mgmt_cmd_complete(sk, hdev->id, MGMT_OP_READ_CONTROLLER_CAP, 0, + rp, sizeof(*rp) + cap_len); } #ifdef CONFIG_BT_FEATURE_DEBUG @@ -8193,7 +8208,7 @@ static const struct hci_mgmt_handler mgmt_handlers[] = { { set_blocked_keys, MGMT_OP_SET_BLOCKED_KEYS_SIZE, HCI_MGMT_VAR_LEN }, { set_wideband_speech, MGMT_SETTING_SIZE }, - { read_security_info, MGMT_READ_SECURITY_INFO_SIZE, + { read_controller_cap, MGMT_READ_CONTROLLER_CAP_SIZE, HCI_MGMT_UNTRUSTED }, { read_exp_features_info, MGMT_READ_EXP_FEATURES_INFO_SIZE, HCI_MGMT_UNTRUSTED |