From patchwork Wed May 22 20:42:51 2024 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: 13671075 Received: from mail-vk1-f178.google.com (mail-vk1-f178.google.com [209.85.221.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7198D7E575 for ; Wed, 22 May 2024 20:42:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.178 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716410578; cv=none; b=tuY0ok1+bk/urfzWQ579xoHJ1Xrt4wqCsByXUpwh4aXWCQ0oEII/fYm/3eeRJqzmPpnBqwrFhCuW2fsGc41meygf2A0P7SimIh3tFOzVLwSO34qI2G7FBU4M4yVQdVr3nfFTQU4/kf0DZqGOlXHH0uSYpTn5uRtS5GxcMochOl8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716410578; c=relaxed/simple; bh=5jvbGWvClORCs8ssqPzjT4tzJhfsBs6UHVltYH78Wgs=; h=From:To:Subject:Date:Message-ID:MIME-Version; b=DSKyWSJ0hwn3vVFGiNu//tKxAPcelHGXY1m78zyKaTFDUZIwQfAhLFRfUZOFqqXF+Y+z6FyRMi/ye8+VIH5oH7npU9QFfKieDv5bCEP7XJqCNHzez43tErJBP4okbiP4K54SiQZE2gmyQ67v57o3Fltw+a67cyXBKU4NMuqGsIo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=GcRNOXyf; arc=none smtp.client-ip=209.85.221.178 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="GcRNOXyf" Received: by mail-vk1-f178.google.com with SMTP id 71dfb90a1353d-4df3e3c674fso2132031e0c.2 for ; Wed, 22 May 2024 13:42:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1716410575; x=1717015375; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:to :from:from:to:cc:subject:date:message-id:reply-to; bh=GiTad0WkrpOGxdvwu/Vf6Dg3jk9yXPS+P/Wgz6N97X0=; b=GcRNOXyfcVeo+YTA49UfgHqwXiFZv4+SoCKdN9IlJiniMxMdroDJcsGNwOnKZpICu1 kmlPtndMV2cQIP8nP9oUw+ACXityRd3EacKL+698UWpFbLoVlzzpU83O3pCjrzyTwvXE Y11pgVxcIfo4I7Chy6WvHLAdCqUkZeSs9Cg0OhAgNGjOOzp2+wy6F/zzKYAslUHizKMY sJV3UeM14YqrbnIIDvHMWkcPf3E91PSEwJhMiZhEagQaNTGrAlaQzdzrXETZv4+ZDugb cr7xmVXbIIkTWAg9YZiVFnd5P9GRRzZqHV+ipvJm52L34GRWZAhjPjsAqtF+VFNBxR1K gqEg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1716410575; x=1717015375; 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=GiTad0WkrpOGxdvwu/Vf6Dg3jk9yXPS+P/Wgz6N97X0=; b=WcBANrskX21AENcle4f13QBQU29ys/HJzQOH6aqAnbSxFAO1q2SGZjyVyYm1Mr5v/3 /6zSnO4WRHW7reY9qZT/16pBlHx2l0LU6ZqfRboIlOqgxYS5mTFrxk6LIWvMP0Aoz1SW fVaXfjxj87+pyeScNwY1jw/FEW5Mb2qukNGebs6J3lfPNpOFGms1dP8Cytg7CLFSp1Mj tkW8sDP5PAZ9h7DfRzhBnTv/qxQfK3FphOtnWJMDtXGSnwGNBhPjE43vODIDPoigwn4/ isFgJ/IpIXjHt87U00X3ZxBbcjz5AimEX/sZy/46aO15eP0lCl4slObZEBvPD4sFHezM QDcA== X-Gm-Message-State: AOJu0YyoshSlswpEipKQTLsHcE1KmpWtZtlvzzMombeGRK1rr9HyyIS0 w9SPKYB1PZEy0SIMOI+aKDRwrjxV30aTcbLNcoqFVwfzP+nJjhUj4gr9mQ== X-Google-Smtp-Source: AGHT+IGFLfJdLdFHHMjbfTXf0RNXOBV8lVw9CGWH0WWfVhonrYtB/boH+B2UeDPqztvwQoy0Bw5C6w== X-Received: by 2002:a05:6122:318e:b0:4df:31f2:a4d5 with SMTP id 71dfb90a1353d-4e2184e9739mr3094991e0c.4.1716410574515; Wed, 22 May 2024 13:42:54 -0700 (PDT) Received: from lvondent-mobl4.. (syn-107-146-107-067.res.spectrum.com. [107.146.107.67]) by smtp.gmail.com with ESMTPSA id 71dfb90a1353d-4df7c050c57sm3749913e0c.36.2024.05.22.13.42.53 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 May 2024 13:42:53 -0700 (PDT) From: Luiz Augusto von Dentz To: linux-bluetooth@vger.kernel.org Subject: [PATCH BlueZ v2 1/2] doc: Add initial L2CAP(7) documentation Date: Wed, 22 May 2024 16:42:51 -0400 Message-ID: <20240522204252.1891896-1-luiz.dentz@gmail.com> X-Mailer: git-send-email 2.45.1 Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Luiz Augusto von Dentz This adds initial documentation for L2CAP sockets. --- Makefile.am | 7 ++ doc/l2cap.rst | 241 ++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 248 insertions(+) create mode 100644 doc/l2cap.rst diff --git a/Makefile.am b/Makefile.am index 05d02932f205..8aedbb20d0d8 100644 --- a/Makefile.am +++ b/Makefile.am @@ -348,6 +348,7 @@ CLEANFILES += $(builtin_files) if MANPAGES man_MANS += src/bluetoothd.8 +man_MANS += doc/l2cap.7 man_MANS += doc/org.bluez.Adapter.5 doc/org.bluez.Device.5 \ doc/org.bluez.DeviceSet.5 doc/org.bluez.AgentManager.5 \ doc/org.bluez.Agent.5 doc/org.bluez.ProfileManager.5 \ @@ -380,6 +381,7 @@ man_MANS += doc/org.bluez.obex.Client.5 doc/org.bluez.obex.Session.5 \ doc/org.bluez.obex.AgentManager.5 doc/org.bluez.obex.Agent.5 endif manual_pages += src/bluetoothd.8 +manual_pages += doc/l2cap.7 manual_pages += doc/org.bluez.Adapter.5 doc/org.bluez.Device.5 \ doc/org.bluez.DeviceSet.5 doc/org.bluez.AgentManager.5 \ doc/org.bluez.Agent.5 doc/org.bluez.ProfileManager.5 \ @@ -457,6 +459,8 @@ EXTRA_DIST += doc/mgmt-api.txt \ doc/health-api.txt \ doc/sap-api.txt +EXTRA_DIST += doc/l2cap.rst + EXTRA_DIST += doc/org.bluez.Adapter.rst doc/org.bluez.Device.rst \ doc/org.bluez.DeviceSet.rst doc/org.bluez.AgentManager.rst \ doc/org.bluez.Agent.rst doc/org.bluez.ProfileManager.rst \ @@ -758,6 +762,9 @@ endif %.5: %.rst Makefile $(RST2MAN_PROCESS) +%.7: %.rst Makefile + $(RST2MAN_PROCESS) + %.8: %.rst Makefile $(RST2MAN_PROCESS) diff --git a/doc/l2cap.rst b/doc/l2cap.rst new file mode 100644 index 000000000000..cad0c54f08a6 --- /dev/null +++ b/doc/l2cap.rst @@ -0,0 +1,241 @@ +===== +l2cap +===== + +-------------- +L2CAP protocol +-------------- + +:Version: BlueZ +:Copyright: Free use of this software is granted under ther terms of the GNU + Lesser General Public Licenses (LGPL). +:Date: May 2024 +:Manual section: 7 +:Manual group: Linux System Administration + +SYNOPSIS +======== + +.. code-block:: c + + #include + #include + #include + + l2cap_socket = socket(AF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP); + +DESCRIPTION +=========== + +L2CAP is a protocol that provides an interface for higher-level protocols to +send and receive data over a Bluetooth connection. L2CAP sits on top of the +Bluetooth Host Controller Interface (HCI) and provides a set of channels that +can be used by higher-level protocols to transmit data. + +L2CAP provides a number of services to higher-level protocols, including +segmentation and reassembly of large data packets and flow control to prevent +overloading of the receiver. L2CAP also supports multiple channels per +connection, allowing for concurrent data transmission using different protocols. + +SOCKET ADDRESS +============== + +.. code-block:: c + + struct sockaddr_l2 { + sa_family_t l2_family; + unsigned short l2_psm; + bdaddr_t l2_bdaddr; + unsigned short l2_cid; + uint8_t l2_bdaddr_type; + }; + +SOCKET OPTIONS +============== + +The socket options listed below can be set by using **setsockopt(2)** and read +with **getsockopt(2)** with the socket level set to SOL_BLUETOOTH. + +BT_SECURITY (since Linux 2.6.30) +-------------------------------- + +Channel security level, possible values: + +.. csv-table:: + :header: "Value", "Security Level", "Link Key Type", "Encryption" + :widths: auto + + **BT_SECURITY_SDP**, 0 (SDP Only), None, Not required + **BT_SECURITY_LOW**, 1 (Low), Unauthenticated, Not required + **BT_SECURITY_MEDIUM**, 2 (Medium - default), Unauthenticated, Desired + **BT_SECURITY_HIGH**, 3 (High), Authenticated, Required + **BT_SECURITY_FIPS** (since Linux 3.15), 4 (Secure Only), Authenticated (P-256 based Secure Simple Pairing and Secure Authentication), Required + +Example: + +.. code-block:: c + + int level = BT_SECURITY_HIGH; + int err = setsockopt(l2cap_socket, SOL_BLUETOOTH, BT_SECURITY, &level, + sizeof(level)); + if (err == -1) { + perror("setsockopt"); + return 1; + } + +BT_DEFER_SETUP (since Linux 2.6.30) +----------------------------------- + +Channel defer connection setup, this control if the connection procedure +needs to be authorized by userspace before responding which allows +authorization at profile level, possible values: + +.. csv-table:: + :header: "Value", "Description" + :widths: auto + + **0**, Disable (userspace authorization not required) + **1**, Enable (userspace authorization required) + +Example: + +.. code-block:: c + + int defer_setup = 1; + int err = setsockopt(l2cap_socket, SOL_BLUETOOTH, BT_DEFER_SETUP, + &defer_setup, sizeof(defer_setup)); + if (err == -1) { + perror("setsockopt"); + return err; + } + + err = listen(l2cap_socket, 5); + if (err) { + perror("listen"); + return err; + } + + struct sockaddr_l2 remote_addr = {0}; + socklen_t addr_len = sizeof(remote_addr); + int new_socket = accept(l2cap_socket, (struct sockaddr*)&remote_addr, + &addr_len); + if (new_socket < 0) { + perror("accept"); + return new_socket; + } + + /* To complete the connection setup of new_socket read 1 byte */ + char c; + struct pollfd pfd; + + memset(&pfd, 0, sizeof(pfd)); + pfd.fd = new_socket; + pfd.events = POLLOUT; + + err = poll(&pfd, 1, 0); + if (err) { + perror("poll"); + return err; + } + + if (!(pfd.revents & POLLOUT)) { + err = read(sk, &c, 1); + if (err < 0) { + perror("read"); + return err; + } + } + +BT_FLUSHABLE (since Linux 2.6.39) +--------------------------------- + +Channel flushable flag, this control if the channel data can be flushed or +not, possible values: + +.. csv-table:: + :header: "Define", "Value", "Description" + :widths: auto + + **BT_FLUSHABLE_OFF**, 0x00, Do not flush data + **BT_FLUSHABLE_ON**, 0x01, Flush data + +BT_POWER (since Linux 3.1) +-------------------------- + +Channel power policy, this control if the channel shall force exit of sniff +mode or not, possible values: + +.. csv-table:: + :header: "Define", "Value", "Description" + :widths: auto + + **BT_POWER_FORCE_ACTIVE_OFF**, 0x00, Don't force exit of sniff mode + **BT_POWER_FORCE_ACTIVE_ON**, 0x01, Force exit of sniff mode + +BT_CHANNEL_POLICY (since Linux 3.10) +------------------------------------ + +High-speed (AMP) channel policy, possible values: + +.. csv-table:: + :header: "Define", "Value", "Description" + :widths: auto + + **BT_CHANNEL_POLICY_BREDR_ONLY**, 0, BR/EDR only - default + **BT_CHANNEL_POLICY_BREDR_PREFERRED**, 1, BR/EDR Preferred + **BT_CHANNEL_POLICY_BREDR_PREFERRED**, 2, AMP Preferred + +BT_PHY (since Linux 5.10) +------------------------- + +Channel supported PHY(s), possible values: + +.. csv-table:: + :header: "Define", "Value", "Description" + :widths: auto + + **BT_PHY_BR_1M_1SLOT**, BIT 0, BR 1Mbps 1SLOT + **BT_PHY_BR_1M_3SLOT**, BIT 1, BR 1Mbps 3SLOT + **BT_PHY_BR_1M_5SLOT**, BIT 2, BR 1Mbps 5SLOT + **BT_PHY_BR_2M_1SLOT**, BIT 3, EDR 2Mbps 1SLOT + **BT_PHY_BR_2M_3SLOT**, BIT 4, EDR 2Mbps 3SLOT + **BT_PHY_BR_2M_5SLOT**, BIT 5, EDR 2Mbps 5SLOT + **BT_PHY_BR_3M_1SLOT**, BIT 6, EDR 3Mbps 1SLOT + **BT_PHY_BR_3M_3SLOT**, BIT 7, EDR 3Mbps 3SLOT + **BT_PHY_BR_3M_5SLOT**, BIT 8, EDR 3Mbps 5SLOT + **BT_PHY_LE_1M_TX**, BIT 9, LE 1Mbps TX + **BT_PHY_LE_1M_RX**, BIT 10, LE 1Mbps RX + **BT_PHY_LE_2M_TX**, BIT 11, LE 2Mbps TX + **BT_PHY_LE_2M_RX**, BIT 12, LE 2Mbps RX + **BT_PHY_LE_CODED_TX**, BIT 13, LE Coded TX + **BT_PHY_LE_CODED_RX**, BIT 14, LE Coded RX + +BT_MODE (since Linux 5.10) +-------------------------- + +Channel Mode, possible values: + +.. csv-table:: + :header: "Define", "Value", "Description" + :widths: auto + + **BT_MODE_BASIC**, 0x00, Basic mode - default + **BT_MODE_ERTM**, 0x01, Enhanced Retransmission mode - BR/EDR only + **BT_MODE_STREAM**, 0x02, Stream mode - BR/EDR only + **BT_MODE_LE_FLOWCTL**, 0x03, Credit based flow control mode - LE only + **BT_MODE_EXT_FLOWCTL**, 0x04, Extended Credit based flow control mode + +RESOURCES +========= + +http://www.bluez.org + +REPORTING BUGS +============== + +linux-bluetooth@vger.kernel.org + +SEE ALSO +======== + +socket(7), l2test(1) From patchwork Wed May 22 20:42:52 2024 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: 13671076 Received: from mail-vk1-f181.google.com (mail-vk1-f181.google.com [209.85.221.181]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 52E39770EA for ; Wed, 22 May 2024 20:42:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.181 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716410579; cv=none; b=ZtvW7HYdmUXlR6SBo8EgupLagRUyoRYgnd14a0c0bVDorIlb6qYVOdULAn6ImD63t5RXCjGz78Yu1WrNsA2FE+BYw1Q+EueB+67v3xC7wIan5QkhvUDlsY9Z1BUu4hRMAoZCTM4BSEmWFyIL0sUAtxVf39adXOC/rqDVzmnUiN4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716410579; c=relaxed/simple; bh=17zB42KjqnDIMm2UmNpJ1oBOCEhVQimS2IrccfCAwCc=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Uw1dk+o8l8+YV4teMtqzfTeRJT/BWhcEUZ+zcZvGTFlwAiEgDueASTikFTMpZL5AqzhQabvw0Z7TK77gX5761A99u/y4zLxU6HoZqx1oj0Sik7gpKG4iyShlkfcW9qvrX1LqanEON6ksL5TC+H4868wI6kySyhc4AbSPgJas3pI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=AA4ff4Ls; arc=none smtp.client-ip=209.85.221.181 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="AA4ff4Ls" Received: by mail-vk1-f181.google.com with SMTP id 71dfb90a1353d-4e15ef06569so700706e0c.1 for ; Wed, 22 May 2024 13:42:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1716410576; x=1717015376; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=Y3hjf6CRrFMxjq3B9ns7PbIfvbdpD9likKacRSDiYvk=; b=AA4ff4Ls3AE0iRgzbChh8ujSfwiwhOdYvWkSg3gqguaTHv0/rRw0otNqjMy5JIns58 kTiUt8zTny8KtBH4M0nhkLtzH6aYJZRlNCLPAXaT+PTZYGaI05+T5WhvfXyYEngt3bZf 4jLJLSfhMbZOfyMp7hdgstg6GJK7MF7KTYTiaZK40EtEXt0IpEJWZXjTiq015dghwrDk YRq+HgKJizCQvpZrA3hSDmIR/xqBERRY7v2YSxtBxe9y6PcClUYNXfC4dAudRjdN/x3p ZisT5aeUFBraP7ryQReiW3aWOJyNrGw6L88bUlbxtdwmTWez5w0dMCq6rMI0f/iunKh8 ZfIw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1716410576; x=1717015376; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Y3hjf6CRrFMxjq3B9ns7PbIfvbdpD9likKacRSDiYvk=; b=Aww3LxkP6s3zxHWPJ5veUbIByE2/aquyq2v/2LG+wJX8l4m6S93M+JLNJuyznssvA6 gFmymsPrPF6ySOc0S0Da40nZJ4BTjKmYCvxcNluM73J+pcBPT25+9sgoiWGU9TWnYbC0 B0Du8pyELi14qATt/1BB9JhUjNt0am2BDfZzbkXzPlAmPyxVPHmunyAusw2FBR/hsf+j w5jGWm7KnXWUIc9+6CwbnFTFbJMrjByTc1n+SWl40/wImubX8Tp8Gb9oV6lyTvmr3XpS oE+edUUIVsPyUOFl6iZpUvKAyury2gbHzlziCxWKiWoleqybgLL42NzryE2FPhk2ZAUk wyRw== X-Gm-Message-State: AOJu0YwZ8uYFQDsy7ZNJBOc6K613CEW4aUTB2InsPY4Xoa+BwXu+Ks9G PTjpC5qECpQMmHkVtjxVFHFa3eKi55gJWNPdREDYcWJaRv4YL4iVlIui+Q== X-Google-Smtp-Source: AGHT+IFixKYzntuEKPgv2Z1wSf8ycI/h50+ijaHlgCHKK6g4c0dU/XtjzVYVNvpLi1j4N1qGLsPLpw== X-Received: by 2002:a05:6122:1078:b0:4da:ddb4:feca with SMTP id 71dfb90a1353d-4e4e4d30f9amr282385e0c.8.1716410576441; Wed, 22 May 2024 13:42:56 -0700 (PDT) Received: from lvondent-mobl4.. (syn-107-146-107-067.res.spectrum.com. [107.146.107.67]) by smtp.gmail.com with ESMTPSA id 71dfb90a1353d-4df7c050c57sm3749913e0c.36.2024.05.22.13.42.54 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 May 2024 13:42:54 -0700 (PDT) From: Luiz Augusto von Dentz To: linux-bluetooth@vger.kernel.org Subject: [PATCH BlueZ v2 2/2] doc: Add initial RFCOMM(7) documentation Date: Wed, 22 May 2024 16:42:52 -0400 Message-ID: <20240522204252.1891896-2-luiz.dentz@gmail.com> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240522204252.1891896-1-luiz.dentz@gmail.com> References: <20240522204252.1891896-1-luiz.dentz@gmail.com> Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Luiz Augusto von Dentz This adds initial documentation for RFCOMM sockets. --- Makefile.am | 4 +- doc/rfcomm.rst | 214 +++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 216 insertions(+), 2 deletions(-) create mode 100644 doc/rfcomm.rst diff --git a/Makefile.am b/Makefile.am index 8aedbb20d0d8..8f5d2fb553b4 100644 --- a/Makefile.am +++ b/Makefile.am @@ -348,7 +348,7 @@ CLEANFILES += $(builtin_files) if MANPAGES man_MANS += src/bluetoothd.8 -man_MANS += doc/l2cap.7 +man_MANS += doc/l2cap.7 doc/rfcomm.7 man_MANS += doc/org.bluez.Adapter.5 doc/org.bluez.Device.5 \ doc/org.bluez.DeviceSet.5 doc/org.bluez.AgentManager.5 \ doc/org.bluez.Agent.5 doc/org.bluez.ProfileManager.5 \ @@ -381,7 +381,7 @@ man_MANS += doc/org.bluez.obex.Client.5 doc/org.bluez.obex.Session.5 \ doc/org.bluez.obex.AgentManager.5 doc/org.bluez.obex.Agent.5 endif manual_pages += src/bluetoothd.8 -manual_pages += doc/l2cap.7 +manual_pages += doc/l2cap.7 doc/rfcomm.7 manual_pages += doc/org.bluez.Adapter.5 doc/org.bluez.Device.5 \ doc/org.bluez.DeviceSet.5 doc/org.bluez.AgentManager.5 \ doc/org.bluez.Agent.5 doc/org.bluez.ProfileManager.5 \ diff --git a/doc/rfcomm.rst b/doc/rfcomm.rst new file mode 100644 index 000000000000..989d3c66dca9 --- /dev/null +++ b/doc/rfcomm.rst @@ -0,0 +1,214 @@ +====== +rfcomm +====== + +--------------- +RFCOMM protocol +--------------- + +:Version: BlueZ +:Copyright: Free use of this software is granted under ther terms of the GNU + Lesser General Public Licenses (LGPL). +:Date: May 2024 +:Manual section: 7 +:Manual group: Linux System Administration + +SYNOPSIS +======== + +.. code-block:: c + + #include + #include + #include + + rfcomm_socket = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM); + +DESCRIPTION +=========== + +The RFCOMM protocol provides emulation of serial ports over the L2CAP(7) +protocol. The protocol is based on the ETSI standard TS 07.10. + +RFCOMM is a simple transport protocol, with additional provisions for emulating +the 9 circuits of RS-232 (EIATIA-232-E) serial ports. + +SOCKET ADDRESS +============== + +.. code-block:: c + + struct sockaddr_rc { + sa_family_t rc_family; + unsigned short rc_bdaddr; + unsigned char rc_channel; + }; + +SOCKET OPTIONS +============== + +The socket options listed below can be set by using **setsockopt(2)** and read +with **getsockopt(2)** with the socket level set to SOL_BLUETOOTH. + +BT_SECURITY (since Linux 2.6.30) +-------------------------------- + +Channel security level, possible values: + +.. csv-table:: + :header: "Value", "Security Level", "Link Key Type", "Encryption" + :widths: auto + + **BT_SECURITY_SDP**, 0 (SDP Only), None, Not required + **BT_SECURITY_LOW**, 1 (Low), Unauthenticated, Not required + **BT_SECURITY_MEDIUM**, 2 (Medium - default), Unauthenticated, Desired + **BT_SECURITY_HIGH**, 3 (High), Authenticated, Required + **BT_SECURITY_FIPS** (since Linux 3.15), 4 (Secure Only), Authenticated (P-256 based Secure Simple Pairing and Secure Authentication), Required + +Example: + +.. code-block:: c + + int level = BT_SECURITY_HIGH; + int err = setsockopt(rfcomm_socket, SOL_BLUETOOTH, BT_SECURITY, &level, + sizeof(level)); + if (err == -1) { + perror("setsockopt"); + return 1; + } + +BT_DEFER_SETUP (since Linux 2.6.30) +----------------------------------- + +Channel defer connection setup, this control if the connection procedure +needs to be authorized by userspace before responding which allows +authorization at profile level, possible values: + +.. csv-table:: + :header: "Value", "Description" + :widths: auto + + **0**, Disable (userspace authorization not required) + **1**, Enable (userspace authorization required) + +Example: + +.. code-block:: c + + int defer_setup = 1; + int err = setsockopt(rfcomm_socket, SOL_BLUETOOTH, BT_DEFER_SETUP, + &defer_setup, sizeof(defer_setup)); + if (err == -1) { + perror("setsockopt"); + return err; + } + + err = listen(rfcomm_socket, 5); + if (err) { + perror("listen"); + return err; + } + + struct sockaddr_rc remote_addr = {0}; + socklen_t addr_len = sizeof(remote_addr); + int new_socket = accept(rfcomm_socket, (struct sockaddr*)&remote_addr, + &addr_len); + if (new_socket < 0) { + perror("accept"); + return new_socket; + } + + /* To complete the connection setup of new_socket read 1 byte */ + char c; + struct pollfd pfd; + + memset(&pfd, 0, sizeof(pfd)); + pfd.fd = new_socket; + pfd.events = POLLOUT; + + err = poll(&pfd, 1, 0); + if (err) { + perror("poll"); + return err; + } + + if (!(pfd.revents & POLLOUT)) { + err = read(sk, &c, 1); + if (err < 0) { + perror("read"); + return err; + } + } + +BT_FLUSHABLE (since Linux 2.6.39) +--------------------------------- + +Channel flushable flag, this control if the channel data can be flushed or +not, possible values: + +.. csv-table:: + :header: "Define", "Value", "Description" + :widths: auto + + **BT_FLUSHABLE_OFF**, 0x00, Do not flush data + **BT_FLUSHABLE_ON**, 0x01, Flush data + +BT_POWER (since Linux 3.1) +-------------------------- + +Channel power policy, this control if the channel shall force exit of sniff +mode or not, possible values: + +.. csv-table:: + :header: "Define", "Value", "Description" + :widths: auto + + **BT_POWER_FORCE_ACTIVE_OFF**, 0x00, Don't force exit of sniff mode + **BT_POWER_FORCE_ACTIVE_ON**, 0x01, Force exit of sniff mode + +BT_CHANNEL_POLICY (since Linux 3.10) +------------------------------------ + +High-speed (AMP) channel policy, possible values: + +.. csv-table:: + :header: "Define", "Value", "Description" + :widths: auto + + **BT_CHANNEL_POLICY_BREDR_ONLY**, 0, BR/EDR only - default + **BT_CHANNEL_POLICY_BREDR_PREFERRED**, 1, BR/EDR Preferred + **BT_CHANNEL_POLICY_BREDR_PREFERRED**, 2, AMP Preferred + +BT_PHY (since Linux 5.10) +------------------------- + +Channel supported PHY(s), possible values: + +.. csv-table:: + :header: "Define", "Value", "Description" + :widths: auto + + **BT_PHY_BR_1M_1SLOT**, BIT 0, BR 1Mbps 1SLOT + **BT_PHY_BR_1M_3SLOT**, BIT 1, BR 1Mbps 3SLOT + **BT_PHY_BR_1M_5SLOT**, BIT 2, BR 1Mbps 5SLOT + **BT_PHY_BR_2M_1SLOT**, BIT 3, EDR 2Mbps 1SLOT + **BT_PHY_BR_2M_3SLOT**, BIT 4, EDR 2Mbps 3SLOT + **BT_PHY_BR_2M_5SLOT**, BIT 5, EDR 2Mbps 5SLOT + **BT_PHY_BR_3M_1SLOT**, BIT 6, EDR 3Mbps 1SLOT + **BT_PHY_BR_3M_3SLOT**, BIT 7, EDR 3Mbps 3SLOT + **BT_PHY_BR_3M_5SLOT**, BIT 8, EDR 3Mbps 5SLOT + +RESOURCES +========= + +http://www.bluez.org + +REPORTING BUGS +============== + +linux-bluetooth@vger.kernel.org + +SEE ALSO +======== + +socket(7), rctest(1)