From patchwork Tue Jun 27 22:59:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luiz Augusto von Dentz X-Patchwork-Id: 13295094 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A4922EB64D9 for ; Tue, 27 Jun 2023 22:59:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230147AbjF0W7W (ORCPT ); Tue, 27 Jun 2023 18:59:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36256 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229927AbjF0W7U (ORCPT ); Tue, 27 Jun 2023 18:59:20 -0400 Received: from mail-pl1-x631.google.com (mail-pl1-x631.google.com [IPv6:2607:f8b0:4864:20::631]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4273B2947 for ; Tue, 27 Jun 2023 15:59:19 -0700 (PDT) Received: by mail-pl1-x631.google.com with SMTP id d9443c01a7336-1b80512a7f2so19153255ad.3 for ; Tue, 27 Jun 2023 15:59:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1687906757; x=1690498757; h=content-transfer-encoding:mime-version:message-id:date:subject:to :from:from:to:cc:subject:date:message-id:reply-to; bh=CsY2ZNtyO5jvicCTrUb3iO/cDNiJUugZM0W2hZTnmpc=; b=eBVZe7vWV37XYTPFF23iIohs+uHfbDOfYGBuS/R5Ni0Bts4Qq9YzL8JKju/6tF6HPa NWyQwHc5IhsHBXn8ckCigx35OHj8bNrutyVb5Z9QdPASoH7rpnDm8UGriOVMNUdMDaWc UQ4DCtM0JANO8BTSqUiB8mvhUeslzC5x/WtMSmOmI7pXl/Lmjl2FRKBL56ZbqoGigw4r 7R+FqfU5xpxCDviDMKg8ip5IuNb+kJRV6xU9kqK2O8BuJFuG/Ctp8/9Nj3V5w9/fQ4px pLL9WEMcodhZNYIePv3bJdnaSntT4L5feYUXFzaXC0Mx2dXfmjZmQ+ZXGIiFRKa3M5+3 7Irw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687906757; x=1690498757; h=content-transfer-encoding:mime-version:message-id:date:subject:to :from:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=CsY2ZNtyO5jvicCTrUb3iO/cDNiJUugZM0W2hZTnmpc=; b=EQ6D+fMZkQftaCIBFKuz1kLs8R3EdIAUbSgacy185g+/OCUWklTx4yAqUt4kCSNvt+ nmaxsfkMQeCYgbIdtWkRfa3DgxTDsehcwxuNsLCz7hLlhrFZwV8LY58IukiIV67UD1FA kfVOI7Qc4Ns0IVgAPvrLPtSNdIXPjgwE64zxQejRzK0CHIEETZpq1aS0SI72IsLJmMJ6 See3N0FJLkDZNmZFcVUEr0uddSk25rkGjCjzmyM2yyJMa8JQk47/U63AWQVXFgT2TgoW LT6Da4rAYpqwS9wYFdm76THXH9IIk+n058/oIeXZrwTohOraXQPbdFYhLewLm93JBdRE LZxQ== X-Gm-Message-State: AC+VfDxol8Gri+DU+VFxzRpbx2J/l5oFvj+iA8PJdunLcZf57iTsCES2 8761a8eCFsJZj8oPzvnCnUxEntmsfL9m/Q== X-Google-Smtp-Source: ACHHUZ5vbtDaRZhaFhCWyvSSm1By/dD3oUubvVFfKZ6s/vPuKe1vkeSpZ1nuhXgm6P53TxWq6+RbHA== X-Received: by 2002:a17:903:11ce:b0:1a6:74f6:fa92 with SMTP id q14-20020a17090311ce00b001a674f6fa92mr9877672plh.19.1687906757317; Tue, 27 Jun 2023 15:59:17 -0700 (PDT) Received: from lvondent-mobl4.. (c-71-59-129-171.hsd1.or.comcast.net. [71.59.129.171]) by smtp.gmail.com with ESMTPSA id w5-20020a170902d3c500b001b1a2bf5277sm259290plb.39.2023.06.27.15.59.16 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jun 2023 15:59:16 -0700 (PDT) From: Luiz Augusto von Dentz To: linux-bluetooth@vger.kernel.org Subject: [PATCH v2 1/2] Bluetooth: hci_conn: Consolidate code for aborting connections Date: Tue, 27 Jun 2023 15:59:14 -0700 Message-Id: <20230627225915.2674812-1-luiz.dentz@gmail.com> X-Mailer: git-send-email 2.40.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org From: Luiz Augusto von Dentz This consolidates code for aborting connections using hci_cmd_sync_queue so it is synchronized with other threads, but because of the fact that some commands may block the cmd_sync_queue while waiting specific events this attempt to cancel those requests by using hci_cmd_sync_cancel. Signed-off-by: Luiz Augusto von Dentz --- include/net/bluetooth/hci_core.h | 2 +- net/bluetooth/hci_conn.c | 160 +++++++------------------------ net/bluetooth/hci_sync.c | 20 ++-- net/bluetooth/mgmt.c | 15 +-- 4 files changed, 48 insertions(+), 149 deletions(-) diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h index 05a9b3ab3f56..094ca3aca15e 100644 --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -741,6 +741,7 @@ struct hci_conn { unsigned long flags; enum conn_reasons conn_reason; + __u8 abort_reason; __u32 clock; __u16 clock_accuracy; @@ -760,7 +761,6 @@ struct hci_conn { struct delayed_work auto_accept_work; struct delayed_work idle_work; struct delayed_work le_conn_timeout; - struct work_struct le_scan_cleanup; struct device dev; struct dentry *debugfs; diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c index 47e7aa4d63a9..88f18f375684 100644 --- a/net/bluetooth/hci_conn.c +++ b/net/bluetooth/hci_conn.c @@ -178,57 +178,6 @@ static void hci_conn_cleanup(struct hci_conn *conn) hci_conn_put(conn); } -static void le_scan_cleanup(struct work_struct *work) -{ - struct hci_conn *conn = container_of(work, struct hci_conn, - le_scan_cleanup); - struct hci_dev *hdev = conn->hdev; - struct hci_conn *c = NULL; - - BT_DBG("%s hcon %p", hdev->name, conn); - - hci_dev_lock(hdev); - - /* Check that the hci_conn is still around */ - rcu_read_lock(); - list_for_each_entry_rcu(c, &hdev->conn_hash.list, list) { - if (c == conn) - break; - } - rcu_read_unlock(); - - if (c == conn) { - hci_connect_le_scan_cleanup(conn, 0x00); - hci_conn_cleanup(conn); - } - - hci_dev_unlock(hdev); - hci_dev_put(hdev); - hci_conn_put(conn); -} - -static void hci_connect_le_scan_remove(struct hci_conn *conn) -{ - BT_DBG("%s hcon %p", conn->hdev->name, conn); - - /* We can't call hci_conn_del/hci_conn_cleanup here since that - * could deadlock with another hci_conn_del() call that's holding - * hci_dev_lock and doing cancel_delayed_work_sync(&conn->disc_work). - * Instead, grab temporary extra references to the hci_dev and - * hci_conn and perform the necessary cleanup in a separate work - * callback. - */ - - hci_dev_hold(conn->hdev); - hci_conn_get(conn); - - /* Even though we hold a reference to the hdev, many other - * things might get cleaned up meanwhile, including the hdev's - * own workqueue, so we can't use that for scheduling. - */ - schedule_work(&conn->le_scan_cleanup); -} - static void hci_acl_create_connection(struct hci_conn *conn) { struct hci_dev *hdev = conn->hdev; @@ -679,13 +628,6 @@ static void hci_conn_timeout(struct work_struct *work) if (refcnt > 0) return; - /* LE connections in scanning state need special handling */ - if (conn->state == BT_CONNECT && conn->type == LE_LINK && - test_bit(HCI_CONN_SCANNING, &conn->flags)) { - hci_connect_le_scan_remove(conn); - return; - } - hci_abort_conn(conn, hci_proto_disconn_ind(conn)); } @@ -1066,7 +1008,6 @@ struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst, INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept); INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle); INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout); - INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup); atomic_set(&conn->refcnt, 0); @@ -2888,81 +2829,46 @@ u32 hci_conn_get_phy(struct hci_conn *conn) return phys; } -int hci_abort_conn(struct hci_conn *conn, u8 reason) +static int abort_conn_sync(struct hci_dev *hdev, void *data) { - int r = 0; + struct hci_conn *conn; + u16 handle = PTR_ERR(data); - if (test_and_set_bit(HCI_CONN_CANCEL, &conn->flags)) + conn = hci_conn_hash_lookup_handle(hdev, handle); + if (!conn) return 0; - switch (conn->state) { - case BT_CONNECTED: - case BT_CONFIG: - if (conn->type == AMP_LINK) { - struct hci_cp_disconn_phy_link cp; + return hci_abort_conn_sync(hdev, conn, conn->abort_reason); +} - cp.phy_handle = HCI_PHY_HANDLE(conn->handle); - cp.reason = reason; - r = hci_send_cmd(conn->hdev, HCI_OP_DISCONN_PHY_LINK, - sizeof(cp), &cp); - } else { - struct hci_cp_disconnect dc; +int hci_abort_conn(struct hci_conn *conn, u8 reason) +{ + struct hci_dev *hdev = conn->hdev; - dc.handle = cpu_to_le16(conn->handle); - dc.reason = reason; - r = hci_send_cmd(conn->hdev, HCI_OP_DISCONNECT, - sizeof(dc), &dc); + /* If abort_reason has already been set it means the connection is + * already being aborted so don't attempt to overwrite it. + */ + if (conn->abort_reason) + return 0; + + bt_dev_dbg(hdev, "handle 0x%2.2x reason 0x%2.2x", conn->handle, reason); + + conn->abort_reason = reason; + + /* If the connection is pending check the command opcode since that + * might be blocking on hci_cmd_sync_work while waiting its respective + * event so we need to hci_cmd_sync_cancel to cancel it. + */ + if (conn->state == BT_CONNECT && hdev->req_status == HCI_REQ_PEND) { + switch (hci_skb_event(hdev->sent_cmd)) { + case HCI_EV_LE_CONN_COMPLETE: + case HCI_EV_LE_ENHANCED_CONN_COMPLETE: + case HCI_EVT_LE_CIS_ESTABLISHED: + hci_cmd_sync_cancel(hdev, -ECANCELED); + break; } - - conn->state = BT_DISCONN; - - break; - case BT_CONNECT: - if (conn->type == LE_LINK) { - if (test_bit(HCI_CONN_SCANNING, &conn->flags)) - break; - r = hci_send_cmd(conn->hdev, - HCI_OP_LE_CREATE_CONN_CANCEL, 0, NULL); - } else if (conn->type == ACL_LINK) { - if (conn->hdev->hci_ver < BLUETOOTH_VER_1_2) - break; - r = hci_send_cmd(conn->hdev, - HCI_OP_CREATE_CONN_CANCEL, - 6, &conn->dst); - } - break; - case BT_CONNECT2: - if (conn->type == ACL_LINK) { - struct hci_cp_reject_conn_req rej; - - bacpy(&rej.bdaddr, &conn->dst); - rej.reason = reason; - - r = hci_send_cmd(conn->hdev, - HCI_OP_REJECT_CONN_REQ, - sizeof(rej), &rej); - } else if (conn->type == SCO_LINK || conn->type == ESCO_LINK) { - struct hci_cp_reject_sync_conn_req rej; - - bacpy(&rej.bdaddr, &conn->dst); - - /* SCO rejection has its own limited set of - * allowed error values (0x0D-0x0F) which isn't - * compatible with most values passed to this - * function. To be safe hard-code one of the - * values that's suitable for SCO. - */ - rej.reason = HCI_ERROR_REJ_LIMITED_RESOURCES; - - r = hci_send_cmd(conn->hdev, - HCI_OP_REJECT_SYNC_CONN_REQ, - sizeof(rej), &rej); - } - break; - default: - conn->state = BT_CLOSED; - break; } - return r; + return hci_cmd_sync_queue(hdev, abort_conn_sync, ERR_PTR(conn->handle), + NULL); } diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c index afb8e970e62c..ef8297d04a8c 100644 --- a/net/bluetooth/hci_sync.c +++ b/net/bluetooth/hci_sync.c @@ -5271,10 +5271,13 @@ static int hci_disconnect_sync(struct hci_dev *hdev, struct hci_conn *conn, } static int hci_le_connect_cancel_sync(struct hci_dev *hdev, - struct hci_conn *conn) + struct hci_conn *conn, u8 reason) { + /* Return reason if scanning since the connection shall probably be + * cleanup directly. + */ if (test_bit(HCI_CONN_SCANNING, &conn->flags)) - return 0; + return reason; if (test_and_set_bit(HCI_CONN_CANCEL, &conn->flags)) return 0; @@ -5283,10 +5286,11 @@ static int hci_le_connect_cancel_sync(struct hci_dev *hdev, 0, NULL, HCI_CMD_TIMEOUT); } -static int hci_connect_cancel_sync(struct hci_dev *hdev, struct hci_conn *conn) +static int hci_connect_cancel_sync(struct hci_dev *hdev, struct hci_conn *conn, + u8 reason) { if (conn->type == LE_LINK) - return hci_le_connect_cancel_sync(hdev, conn); + return hci_le_connect_cancel_sync(hdev, conn, reason); if (hdev->hci_ver < BLUETOOTH_VER_1_2) return 0; @@ -5339,9 +5343,11 @@ int hci_abort_conn_sync(struct hci_dev *hdev, struct hci_conn *conn, u8 reason) case BT_CONFIG: return hci_disconnect_sync(hdev, conn, reason); case BT_CONNECT: - err = hci_connect_cancel_sync(hdev, conn); + err = hci_connect_cancel_sync(hdev, conn, reason); /* Cleanup hci_conn object if it cannot be cancelled as it - * likelly means the controller and host stack are out of sync. + * likelly means the controller and host stack are out of sync + * or in case of LE it was still scanning so it can be cleanup + * safely. */ if (err) { hci_dev_lock(hdev); @@ -6255,7 +6261,7 @@ int hci_le_create_conn_sync(struct hci_dev *hdev, struct hci_conn *conn) done: if (err == -ETIMEDOUT) - hci_le_connect_cancel_sync(hdev, conn); + hci_le_connect_cancel_sync(hdev, conn, 0x00); /* Re-enable advertising after the connection attempt is finished. */ hci_resume_advertising_sync(hdev); diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c index 0f5ba618ceb1..3156bc27088e 100644 --- a/net/bluetooth/mgmt.c +++ b/net/bluetooth/mgmt.c @@ -3586,18 +3586,6 @@ static int pair_device(struct sock *sk, struct hci_dev *hdev, void *data, return err; } -static int abort_conn_sync(struct hci_dev *hdev, void *data) -{ - struct hci_conn *conn; - u16 handle = PTR_ERR(data); - - conn = hci_conn_hash_lookup_handle(hdev, handle); - if (!conn) - return 0; - - return hci_abort_conn_sync(hdev, conn, HCI_ERROR_REMOTE_USER_TERM); -} - static int cancel_pair_device(struct sock *sk, struct hci_dev *hdev, void *data, u16 len) { @@ -3648,8 +3636,7 @@ static int cancel_pair_device(struct sock *sk, struct hci_dev *hdev, void *data, le_addr_type(addr->type)); if (conn->conn_reason == CONN_REASON_PAIR_DEVICE) - hci_cmd_sync_queue(hdev, abort_conn_sync, ERR_PTR(conn->handle), - NULL); + hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM); unlock: hci_dev_unlock(hdev); From patchwork Tue Jun 27 22:59:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luiz Augusto von Dentz X-Patchwork-Id: 13295093 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8AE32EB64DC for ; Tue, 27 Jun 2023 22:59:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230152AbjF0W7W (ORCPT ); Tue, 27 Jun 2023 18:59:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36258 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230145AbjF0W7U (ORCPT ); Tue, 27 Jun 2023 18:59:20 -0400 Received: from mail-pl1-x636.google.com (mail-pl1-x636.google.com [IPv6:2607:f8b0:4864:20::636]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 06DF426B9 for ; 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[71.59.129.171]) by smtp.gmail.com with ESMTPSA id w5-20020a170902d3c500b001b1a2bf5277sm259290plb.39.2023.06.27.15.59.17 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jun 2023 15:59:17 -0700 (PDT) From: Luiz Augusto von Dentz To: linux-bluetooth@vger.kernel.org Subject: [PATCH v2 2/2] Bluetooth: hci_sync: Fix not handling ISO_LINK in hci_abort_conn_sync Date: Tue, 27 Jun 2023 15:59:15 -0700 Message-Id: <20230627225915.2674812-2-luiz.dentz@gmail.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230627225915.2674812-1-luiz.dentz@gmail.com> References: <20230627225915.2674812-1-luiz.dentz@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org From: Luiz Augusto von Dentz ISO_LINK connections where not being handled properly on hci_abort_conn_sync which sometimes resulted in sending the wrong commands, or in case of having the reject command being sent by the socket code (iso.c) which is sort of a layer violation. Signed-off-by: Luiz Augusto von Dentz --- net/bluetooth/hci_sync.c | 34 ++++++++++++++++++++++++++++++++++ net/bluetooth/iso.c | 14 -------------- 2 files changed, 34 insertions(+), 14 deletions(-) diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c index ef8297d04a8c..29bcfd576713 100644 --- a/net/bluetooth/hci_sync.c +++ b/net/bluetooth/hci_sync.c @@ -5292,6 +5292,24 @@ static int hci_connect_cancel_sync(struct hci_dev *hdev, struct hci_conn *conn, if (conn->type == LE_LINK) return hci_le_connect_cancel_sync(hdev, conn, reason); + if (conn->type == ISO_LINK) { + /* BLUETOOTH CORE SPECIFICATION Version 5.3 | Vol 4, Part E + * page 1857: + * + * If this command is issued for a CIS on the Central and the + * CIS is successfully terminated before being established, + * then an HCI_LE_CIS_Established event shall also be sent for + * this CIS with the Status Operation Cancelled by Host (0x44). + */ + if (test_bit(HCI_CONN_CREATE_CIS, &conn->flags)) + return hci_disconnect_sync(hdev, conn, reason); + + /* There is no way to cancel a BIS without terminating the BIG + * which is done later on connection cleanup. + */ + return 0; + } + if (hdev->hci_ver < BLUETOOTH_VER_1_2) return 0; @@ -5318,11 +5336,27 @@ static int hci_reject_sco_sync(struct hci_dev *hdev, struct hci_conn *conn, sizeof(cp), &cp, HCI_CMD_TIMEOUT); } +static int hci_le_reject_cis_sync(struct hci_dev *hdev, struct hci_conn *conn, + u8 reason) +{ + struct hci_cp_le_reject_cis cp; + + memset(&cp, 0, sizeof(cp)); + cp.handle = cpu_to_le16(conn->handle); + cp.reason = reason; + + return __hci_cmd_sync_status(hdev, HCI_OP_LE_REJECT_CIS, + sizeof(cp), &cp, HCI_CMD_TIMEOUT); +} + static int hci_reject_conn_sync(struct hci_dev *hdev, struct hci_conn *conn, u8 reason) { struct hci_cp_reject_conn_req cp; + if (conn->type == ISO_LINK) + return hci_le_reject_cis_sync(hdev, conn, reason); + if (conn->type == SCO_LINK || conn->type == ESCO_LINK) return hci_reject_sco_sync(hdev, conn, reason); diff --git a/net/bluetooth/iso.c b/net/bluetooth/iso.c index 84d238d0639a..9c41af55f2c7 100644 --- a/net/bluetooth/iso.c +++ b/net/bluetooth/iso.c @@ -614,18 +614,6 @@ static void iso_sock_kill(struct sock *sk) sock_put(sk); } -static void iso_conn_defer_reject(struct hci_conn *conn) -{ - struct hci_cp_le_reject_cis cp; - - BT_DBG("conn %p", conn); - - memset(&cp, 0, sizeof(cp)); - cp.handle = cpu_to_le16(conn->handle); - cp.reason = HCI_ERROR_REJ_BAD_ADDR; - hci_send_cmd(conn->hdev, HCI_OP_LE_REJECT_CIS, sizeof(cp), &cp); -} - static void __iso_sock_close(struct sock *sk) { BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); @@ -650,8 +638,6 @@ static void __iso_sock_close(struct sock *sk) break; case BT_CONNECT2: - if (iso_pi(sk)->conn->hcon) - iso_conn_defer_reject(iso_pi(sk)->conn->hcon); iso_chan_del(sk, ECONNRESET); break; case BT_CONNECT: