From patchwork Mon Nov 30 22:57:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Winkler X-Patchwork-Id: 11941485 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=-26.3 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 E4037C71156 for ; Mon, 30 Nov 2020 22:59:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 92D6820725 for ; Mon, 30 Nov 2020 22:59:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="GGPFU8d7" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388912AbgK3W7X (ORCPT ); Mon, 30 Nov 2020 17:59:23 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42448 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388849AbgK3W7W (ORCPT ); Mon, 30 Nov 2020 17:59:22 -0500 Received: from mail-qt1-x84a.google.com (mail-qt1-x84a.google.com [IPv6:2607:f8b0:4864:20::84a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6A619C0613D2 for ; Mon, 30 Nov 2020 14:58:01 -0800 (PST) Received: by mail-qt1-x84a.google.com with SMTP id y5so9502171qtb.13 for ; Mon, 30 Nov 2020 14:58:01 -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=6y1kkcd2BJbVhGVlB5bCJsKpT2ezQC3RZbiSpbF+1Qw=; b=GGPFU8d7ZSrOHEgiqLRK4ul8/n0Vy4GcDqTUwpdWrZF1Cy6ZJwvTzWmj9SFZRJrEiB 6e4C/OcH2sMqJ30AGojMJwopZ0EVJUByG+fvUFJYqqYcZwnWFE47agFZA3PN7PxzAjtG aX3r0Pw0fRpqwILMzRBy5yAqmuJRndBGNC57ZAXi3jFyF7K5hPlj8jICC0unPNYjkVtZ hC/M6/2m9cTDMq0GeVXGxraXDwFkax7fAHfJswjXXIsAXK1gc5LyPdcLkKkMrxBFS0ud qkkpfuufzFYjXhGle33FxdiR+pVlE94pAtovbg8NimyrZ6HfgXEnpiLwO1Tq2EDoefwG fLnw== 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=6y1kkcd2BJbVhGVlB5bCJsKpT2ezQC3RZbiSpbF+1Qw=; b=kSciwzQuKqqMjWMoPvdAqL81KzfqbgQAzCcFwrwB5+D9F2n8WoWSWVx0dMYi71a9bp hjEfh46evFc1S+OyCtQq6GH3cp6EtyPVpw/h2T8PvVHvmHN0uplfM8gxMZEEpvSURItN VjxMNnilmM9Nsx0x+dscQdNjdfB6GpYxhg/IBr6Ecp4uUz1IH/yQmFpKQVT+HsqSDiTh JFovof820/vGJJb1598T6lK4D9LbhQL25hr0tB0IeZcD08oEogJkPTlOyN/OBxr4rdtf 9xGZFb1w5rN6azMnBJzytpTlsBKQL8kv8mL1I1PF+j+2m2wcSWya4jiNtIvGzvZV61av 0JmA== X-Gm-Message-State: AOAM533nt3o0u7Q8o2zA/0HNyI3YZY6ASAO3zy5p0F29fU6WL9Naekjq GrJ7rpx2PNsSzSG1PItPtQCosJcOxL2KRgz9eLNj X-Google-Smtp-Source: ABdhPJxYEWUPBVcLx2uzTdRQMykfKhPLII9fP/xjuXEBtrHhFJzTwhSizR1FKoj07q9bR5EVZ5qWDbQsGT6ewHVczZSb 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:cb8f:: with SMTP id p15mr24377601qvk.43.1606777080629; Mon, 30 Nov 2020 14:58:00 -0800 (PST) Date: Mon, 30 Nov 2020 14:57:44 -0800 In-Reply-To: <20201130225744.3793244-1-danielwinkler@google.com> Message-Id: <20201130145609.v6.5.I5068c01cae3cea674a96e103a0cf4d8c81425a4f@changeid> Mime-Version: 1.0 References: <20201130225744.3793244-1-danielwinkler@google.com> X-Mailer: git-send-email 2.29.2.454.gaff20da3a2-goog Subject: [PATCH v6 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 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 |