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ng_btsocket(4)

NAME

     ng_btsocket -- Bluetooth sockets layer


SYNOPSIS

     #include <sys/types.h>
     #include <sys/socket.h>
     #include <sys/bitstring.h>
     #include <netgraph/bluetooth/include/ng_hci.h>
     #include <netgraph/bluetooth/include/ng_l2cap.h>
     #include <netgraph/bluetooth/include/ng_btsocket.h>


DESCRIPTION

     The ng_btsocket module implements three Netgraph node types.  Each type
     in its turn implements one protocol within PF_BLUETOOTH domain.


BLUETOOTH_PROTO_HCI protocol

   SOCK_RAW HCI sockets
     Implemented by btsock_hci_raw Netgraph type.  Raw HCI sockets allow send-
     ing of raw HCI command datagrams only to correspondents named in send(2)
     calls.  Raw HCI datagrams (HCI commands, events and data) are generally
     received with recvfrom(2), which returns the next datagram with its
     return address.  Raw HCI sockets can also be used to control HCI nodes.

     The Bluetooth raw HCI socket address is defined as follows:

	   /* 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[16]; /* HCI node name */
	   };

     Raw HCI sockets support number of ioctl(2) requests such as:

     SIOC_HCI_RAW_NODE_GET_STATE
	     Returns current state for the HCI node.

     SIOC_HCI_RAW_NODE_INIT
	     Turn on ``inited'' bit for the HCI node.

     SIOC_HCI_RAW_NODE_GET_DEBUG
	     Returns current debug level for the HCI node.

     SIOC_HCI_RAW_NODE_SET_DEBUG
	     Sets current debug level for the HCI node.

     SIOC_HCI_RAW_NODE_GET_BUFFER
	     Returns current state of data buffers for the HCI node.

     SIOC_HCI_RAW_NODE_GET_BDADDR
	     Returns BD_ADDR for the HCI node.

     SIOC_HCI_RAW_NODE_GET_FEATURES
	     Returns the list of features supported by hardware for the HCI
	     node.

     SIOC_HCI_RAW_NODE_GET_STAT
     SIOC_HCI_RAW_NODE_GET_NEIGHBOR_CACHE
	     Returns content of the neighbor cache for the HCI node.

     SIOC_HCI_RAW_NODE_GET_CON_LIST
	     Returns list of active baseband connections (i.e., ACL and SCO
	     links) for the HCI node.

     SIOC_HCI_RAW_NODE_GET_LINK_POLICY_MASK
	     Returns current link policy settings mask for the HCI node.

     SIOC_HCI_RAW_NODE_SET_LINK_POLICY_MASK
	     Sets current link policy settings mask for the HCI node.

     SIOC_HCI_RAW_NODE_GET_PACKET_MASK
	     Returns current packet mask for the HCI node.

     SIOC_HCI_RAW_NODE_SET_PACKET_MASK
	     Sets current packet mask for the HCI node.

     SIOC_HCI_RAW_NODE_GET_ROLE_SWITCH
	     Returns current value of the role switch parameter for the HCI
	     node.

     SIOC_HCI_RAW_NODE_SET_ROLE_SWITCH
	     Sets new value of the role switch parameter for the HCI node.

     The net.bluetooth.hci.sockets.raw.ioctl_timeout variable, that can be
     examined and set via sysctl(8), controls the control request timeout (in
     seconds) for raw HCI sockets.

     Raw HCI sockets support filters.  The application can filter certain HCI
     datagram types.  For HCI event datagrams the application can set addi-
     tional filter.  The raw HCI socket filter defined as follows:

	   /*
	    * 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));
	   };

     The SO_HCI_RAW_FILTER option defined at SOL_HCI_RAW level can be used to
     obtain via getsockopt(2) or change via setsockopt(2) raw HCI socket's
     filter.


BLUETOOTH_PROTO_L2CAP protocol

     The Bluetooth L2CAP socket address is defined as follows:

	   /* Bluetooth version of struct sockaddr for L2CAP sockets */
	   struct sockaddr_l2cap {
		   u_char    l2cap_len;    /* total length */
		   u_char    l2cap_family; /* address family */
		   u_int16_t l2cap_psm;    /* Protocol/Service Multiplexor */

     Raw L2CAP sockets support number of ioctl(2) requests such as:

     SIOC_L2CAP_NODE_GET_FLAGS
	     Returns current state for the L2CAP node.

     SIOC_L2CAP_NODE_GET_DEBUG
	     Returns current debug level for the L2CAP node.

     SIOC_L2CAP_NODE_SET_DEBUG
	     Sets current debug level for the L2CAP node.

     SIOC_L2CAP_NODE_GET_CON_LIST
	     Returns list of active baseband connections (i.e., ACL links) for
	     the L2CAP node.

     SIOC_L2CAP_NODE_GET_CHAN_LIST
	     Returns list of active channels for the L2CAP node.

     SIOC_L2CAP_NODE_GET_AUTO_DISCON_TIMO
	     Returns current value of the auto disconnect timeout for the
	     L2CAP node.

     SIOC_L2CAP_NODE_SET_AUTO_DISCON_TIMO
	     Sets current value of the auto disconnect timeout for the L2CAP
	     node.

     SIOC_L2CAP_L2CA_PING
	     Issues L2CAP ECHO_REQUEST.

     SIOC_L2CAP_L2CA_GET_INFO
	     Issues L2CAP GET_INFO request.

     The net.bluetooth.l2cap.sockets.raw.ioctl_timeout variable, that can be
     examined and set via sysctl(8), controls the control request timeout (in
     seconds) for raw L2CAP sockets.

   SOCK_SEQPACKET L2CAP sockets
     Implemented by btsock_l2c Netgraph type.  L2CAP sockets are either
     ``active'' or ``passive''.  Active sockets initiate connections to pas-
     sive sockets.  By default, L2CAP sockets are created active; to create a
     passive socket, the listen(2) system call must be used after binding the
     socket with the bind(2) system call.  Only passive sockets may use the
     accept(2) call to accept incoming connections.  Only active sockets may
     use the connect(2) call to initiate connections.

     L2CAP sockets support ``wildcard addressing''.  In this case, socket must
     be bound to NG_HCI_BDADDR_ANY address.  Note that PSM (Protocol/Service
     Multiplexor) field is always required.  Once a connection has been estab-
     lished, the socket's address is fixed by the peer entity's location.  The
     address assigned to the socket is the address associated with the Blue-
     tooth device through which packets are being transmitted and received,
     and PSM (Protocol/Service Multiplexor).

     L2CAP sockets support number of options defined at SOL_L2CAP level which
     can be set with setsockopt(2) and tested with getsockopt(2):

     SO_L2CAP_IMTU
	     Get incoming flow specification for the socket.  Not implemented.

     SO_L2CAP_OFLOW
	     Get (set) outgoing flow specification for the socket.  Not imple-
	     mented.

     SO_L2CAP_FLUSH
	     Get (set) value of the flush timeout.  Not implemented.


BLUETOOTH_PROTO_RFCOMM protocol

     The Bluetooth RFCOMM socket address is defined as follows:

	   /* 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 */
		   u_int8_t rfcomm_channel; /* channel */
	   };

   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 sock-
     ets.  RFCOMM sockets are either ``active'' or ``passive''.  Active sock-
     ets initiate connections to passive sockets.  By default, RFCOMM sockets
     are created active; to create a passive socket, the listen(2) system call
     must be used after binding the socket with the bind(2) system call.  Only
     passive sockets may use the accept(2) call to accept incoming connec-
     tions.  Only active sockets may use the connect(2) call to initiate con-
     nections.

     RFCOMM sockets support ``wildcard addressing''.  In this case, socket
     must be bound to 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.

     The following options, which can be tested with getsockopt(2) call, are
     defined at SOL_RFCOMM level for RFCOMM sockets:

     SO_RFCOMM_MTU
	     Returns the maximum transfer unit size (in bytes) for the under-
	     lying RFCOMM channel.  Note that application still can write/read
	     bigger chunks to/from the socket.

     SO_RFCOMM_FC_INFO
	     Return the flow control information for the underlying RFCOMM
	     channel.

     The net.bluetooth.rfcomm.sockets.stream.timeout variable, that can be
     examined and set via sysctl(8), controls the connection timeout (in sec-
     onds) for RFCOMM sockets.


HOOKS

     These node types support hooks with arbitrary names (as long as they are


BUGS

     Most likely.  Please report if found.


SEE ALSO

     btsockstat(1), socket(2), netgraph(4), ng_bluetooth(4), ng_hci(4),
     ng_l2cap(4), ngctl(8), sysctl(8)


HISTORY

     The ng_btsocket module was implemented in FreeBSD 5.0.


AUTHORS

     Maksim Yevmenkin <m_evmenkin@yahoo.com>

FreeBSD 5.4			 July 8, 2002			   FreeBSD 5.4

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