.\" Copyright (c) 2001-2002 Maksim Yevmenkin .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" $Id: ng_btsocket.4,v 1.7 2003/05/21 19:37:35 max Exp $ .\" $FreeBSD: releng/12.0/share/man/man4/ng_btsocket.4 286663 2015-08-12 11:56:19Z brueffer $ .\" .Dd November 13, 2012 .Dt NG_BTSOCKET 4 .Os .Sh NAME .Nm ng_btsocket .Nd Bluetooth sockets layer .Sh SYNOPSIS .In sys/types.h .In sys/socket.h .In sys/bitstring.h .In netgraph/bluetooth/include/ng_hci.h .In netgraph/bluetooth/include/ng_l2cap.h .In netgraph/bluetooth/include/ng_btsocket.h .Sh DESCRIPTION The .Nm module implements three Netgraph node types. Each type in its turn implements one protocol within .Dv PF_BLUETOOTH domain. .Sh Dv BLUETOOTH_PROTO_HCI protocol .Ss Dv SOCK_RAW HCI sockets Implemented by .Nm btsock_hci_raw Netgraph type. Raw HCI sockets allow sending of raw HCI command datagrams only to correspondents named in .Xr send 2 calls. Raw HCI datagrams (HCI commands, events and data) are generally received with .Xr recvfrom 2 , which returns the next datagram with its return address. Raw HCI sockets can also be used to control HCI nodes. .Pp The Bluetooth raw HCI socket address is defined as follows: .Bd -literal -offset indent /* Bluetooth version of struct sockaddr for raw HCI sockets */ struct sockaddr_hci { u_char hci_len; /* total length */ u_char hci_family; /* address family */ char hci_node[32]; /* address (size == NG_NODESIZ ) */ }; .Ed .Pp Raw HCI sockets support a number of .Xr ioctl 2 requests such as: .Bl -tag -width foo .It Dv SIOC_HCI_RAW_NODE_GET_STATE Returns current state for the HCI node. .It Dv SIOC_HCI_RAW_NODE_INIT Turn on .Dq inited bit for the HCI node. .It Dv SIOC_HCI_RAW_NODE_GET_DEBUG Returns current debug level for the HCI node. .It Dv SIOC_HCI_RAW_NODE_SET_DEBUG Sets current debug level for the HCI node. .It Dv SIOC_HCI_RAW_NODE_GET_BUFFER Returns current state of data buffers for the HCI node. .It Dv SIOC_HCI_RAW_NODE_GET_BDADDR Returns BD_ADDR for the HCI node. .It Dv SIOC_HCI_RAW_NODE_GET_FEATURES Returns the list of features supported by hardware for the HCI node. .It Dv SIOC_HCI_RAW_NODE_GET_STAT Returns various statistic counters for the HCI node. .It Dv SIOC_HCI_RAW_NODE_RESET_STAT Resets all statistic counters for the HCI node to zero. .It Dv SIOC_HCI_RAW_NODE_FLUSH_NEIGHBOR_CACHE Remove all neighbor cache entries for the HCI node. .It Dv SIOC_HCI_RAW_NODE_GET_NEIGHBOR_CACHE Returns content of the neighbor cache for the HCI node. .It Dv SIOC_HCI_RAW_NODE_GET_CON_LIST Returns list of active baseband connections (i.e., ACL and SCO links) for the HCI node. .It SIOC_HCI_RAW_NODE_GET_LINK_POLICY_MASK Returns current link policy settings mask for the HCI node. .It SIOC_HCI_RAW_NODE_SET_LINK_POLICY_MASK Sets current link policy settings mask for the HCI node. .It SIOC_HCI_RAW_NODE_GET_PACKET_MASK Returns current packet mask for the HCI node. .It SIOC_HCI_RAW_NODE_SET_PACKET_MASK Sets current packet mask for the HCI node. .It SIOC_HCI_RAW_NODE_GET_ROLE_SWITCH Returns current value of the role switch parameter for the HCI node. .It SIOC_HCI_RAW_NODE_SET_ROLE_SWITCH Sets new value of the role switch parameter for the HCI node. .El .Pp The .Va net.bluetooth.hci.sockets.raw.ioctl_timeout variable, that can be examined and set via .Xr sysctl 8 , controls the control request timeout (in seconds) for raw HCI sockets. .Pp Raw HCI sockets support filters. The application can filter certain HCI datagram types. For HCI event datagrams the application can set additional filter. The raw HCI socket filter defined as follows: .Bd -literal -offset indent /* * Raw HCI socket filter. * * For packet mask use (1 << (HCI packet indicator - 1)) * For event mask use (1 << (Event - 1)) */ struct ng_btsocket_hci_raw_filter { bitstr_t bit_decl(packet_mask, 32); bitstr_t bit_decl(event_mask, (NG_HCI_EVENT_MASK_SIZE * 8)); }; .Ed .Pp The .Dv SO_HCI_RAW_FILTER option defined at .Dv SOL_HCI_RAW level can be used to obtain via .Xr getsockopt 2 or change via .Xr setsockopt 2 raw HCI socket's filter. .Sh Dv BLUETOOTH_PROTO_L2CAP protocol The Bluetooth L2CAP socket address is defined as follows: .Bd -literal -offset indent /* Bluetooth version of struct sockaddr for L2CAP sockets */ struct sockaddr_l2cap { u_char l2cap_len; /* total length */ u_char l2cap_family; /* address family */ uint16_t l2cap_psm; /* Protocol/Service Multiplexor */ bdaddr_t l2cap_bdaddr; /* address */ }; .Ed .Ss Dv SOCK_RAW L2CAP sockets Implemented by .Nm btsock_l2c_raw Netgraph type. Raw L2CAP sockets do not provide access to raw L2CAP datagrams. These sockets used to control L2CAP nodes and to issue special L2CAP requests such as .Dv ECHO_REQUEST and .Dv GET_INFO request. .Pp Raw L2CAP sockets support number of .Xr ioctl 2 requests such as: .Bl -tag -width foo .It Dv SIOC_L2CAP_NODE_GET_FLAGS Returns current state for the L2CAP node. .It Dv SIOC_L2CAP_NODE_GET_DEBUG Returns current debug level for the L2CAP node. .It Dv SIOC_L2CAP_NODE_SET_DEBUG Sets current debug level for the L2CAP node. .It Dv SIOC_L2CAP_NODE_GET_CON_LIST Returns list of active baseband connections (i.e., ACL links) for the L2CAP node. .It Dv SIOC_L2CAP_NODE_GET_CHAN_LIST Returns list of active channels for the L2CAP node. .It Dv SIOC_L2CAP_NODE_GET_AUTO_DISCON_TIMO Returns current value of the auto disconnect timeout for the L2CAP node. .It Dv SIOC_L2CAP_NODE_SET_AUTO_DISCON_TIMO Sets current value of the auto disconnect timeout for the L2CAP node. .It Dv SIOC_L2CAP_L2CA_PING Issues L2CAP .Dv ECHO_REQUEST . .It Dv SIOC_L2CAP_L2CA_GET_INFO Issues L2CAP .Dv GET_INFO request. .El .Pp The .Va net.bluetooth.l2cap.sockets.raw.ioctl_timeout variable, that can be examined and set via .Xr sysctl 8 , controls the control request timeout (in seconds) for raw L2CAP sockets. .Ss Dv SOCK_SEQPACKET L2CAP sockets Implemented by .Nm btsock_l2c Netgraph type. L2CAP sockets are either .Dq active or .Dq passive . Active sockets initiate connections to passive sockets. By default, L2CAP sockets are created active; to create a passive socket, the .Xr listen 2 system call must be used after binding the socket with the .Xr bind 2 system call. Only passive sockets may use the .Xr accept 2 call to accept incoming connections. Only active sockets may use the .Xr connect 2 call to initiate connections. .Pp L2CAP sockets support .Dq "wildcard addressing" . In this case, socket must be bound to .Dv NG_HCI_BDADDR_ANY address. Note that PSM (Protocol/Service Multiplexor) field is always required. Once a connection has been established, the socket's address is fixed by the peer entity's location. The address assigned to the socket is the address associated with the Bluetooth device through which packets are being transmitted and received, and PSM (Protocol/Service Multiplexor). .Pp L2CAP sockets support number of options defined at .Dv SOL_L2CAP level which can be set with .Xr setsockopt 2 and tested with .Xr getsockopt 2 : .Bl -tag -width foo .It Dv SO_L2CAP_IMTU Get (set) maximum payload size the local socket is capable of accepting. .It Dv SO_L2CAP_OMTU Get maximum payload size the remote socket is capable of accepting. .It Dv SO_L2CAP_IFLOW Get incoming flow specification for the socket. .Bf -emphasis Not implemented. .Ef .It Dv SO_L2CAP_OFLOW Get (set) outgoing flow specification for the socket. .Bf -emphasis Not implemented. .Ef .It Dv SO_L2CAP_FLUSH Get (set) value of the flush timeout. .Bf -emphasis Not implemented. .Ef .El .Sh Dv BLUETOOTH_PROTO_RFCOMM protocol The Bluetooth RFCOMM socket address is defined as follows: .Bd -literal -offset indent /* Bluetooth version of struct sockaddr for RFCOMM sockets */ struct sockaddr_rfcomm { u_char rfcomm_len; /* total length */ u_char rfcomm_family; /* address family */ bdaddr_t rfcomm_bdaddr; /* address */ uint8_t rfcomm_channel; /* channel */ }; .Ed .Ss Dv SOCK_STREAM RFCOMM sockets Note that RFCOMM sockets do not have associated Netgraph node type. RFCOMM sockets are implemented as additional layer on top of L2CAP sockets. RFCOMM sockets are either .Dq active or .Dq passive . Active sockets initiate connections to passive sockets. By default, RFCOMM sockets are created active; to create a passive socket, the .Xr listen 2 system call must be used after binding the socket with the .Xr bind 2 system call. Only passive sockets may use the .Xr accept 2 call to accept incoming connections. Only active sockets may use the .Xr connect 2 call to initiate connections. .Pp RFCOMM sockets support .Dq "wildcard addressing" . In this case, socket must be bound to .Dv NG_HCI_BDADDR_ANY address. Note that RFCOMM channel field is always required. Once a connection has been established, the socket's address is fixed by the peer entity's location. The address assigned to the socket is the address associated with the Bluetooth device through which packets are being transmitted and received, and RFCOMM channel. .Pp The following options, which can be tested with .Xr getsockopt 2 call, are defined at .Dv SOL_RFCOMM level for RFCOMM sockets: .Bl -tag -width foo .It Dv SO_RFCOMM_MTU Returns the maximum transfer unit size (in bytes) for the underlying RFCOMM channel. Note that application still can write/read bigger chunks to/from the socket. .It Dv SO_RFCOMM_FC_INFO Return the flow control information for the underlying RFCOMM channel. .El .Pp The .Va net.bluetooth.rfcomm.sockets.stream.timeout variable, that can be examined and set via .Xr sysctl 8 , controls the connection timeout (in seconds) for RFCOMM sockets. .Sh HOOKS These node types support hooks with arbitrary names (as long as they are unique) and always accept hook connection requests. .Sh NETGRAPH CONTROL MESSAGES These node types support the generic control messages. .Sh SHUTDOWN These nodes are persistent and cannot be shut down. .Sh SEE ALSO .Xr btsockstat 1 , .Xr socket 2 , .Xr netgraph 4 , .Xr ng_bluetooth 4 , .Xr ng_hci 4 , .Xr ng_l2cap 4 , .Xr ngctl 8 , .Xr sysctl 8 .Sh HISTORY The .Nm module was implemented in .Fx 5.0 . .Sh AUTHORS .An Maksim Yevmenkin Aq Mt m_evmenkin@yahoo.com .Sh BUGS Most likely. Please report if found.