freebsd/share/man/man4/ng_btsocket.4

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.\" $Id: ng_btsocket.4,v 1.6 2003/03/18 00:09:34 max Exp $
.\" $FreeBSD$
.Dd July 8, 2002
.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 bitstring.h
.In netgraph.h
.In ng_hci.h
.In ng_l2cap.h
.In 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.
.Pp
.Sh BLUETOOTH_PROTO_HCI protocol
.Ss SOCK_RAW HCI sockets
Implemented by
.Cm 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. Also raw HCI
sockets can 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[16]; /* HCI node name */
};
.Ed
.Pp
Raw HCI sockets support 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
.Dv 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.
.Pp
.Sh 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 */
        u_int16_t l2cap_psm;    /* Protocol/Service Multiplexor */
        bdaddr_t  l2cap_bdaddr; /* address */
};
.Ed
.Pp
.Ss SOCK_RAW L2CAP sockets
Implemented by
.Cm 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 ECHO_REQUEST and 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_L2CA_PING
Issues L2CAP ECHO_REQUEST.
.It Dv SIOC_L2CAP_L2CA_GET_INFO
Issues L2CAP GET_INFO request.
.El
.Pp
The
.Dv 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.
.Pp
.Ss SOCK_SEQPACKET L2CAP sockets
Implemented by
.Cm 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 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. 
.Em Not implemented at the L2CAP layer .
.It Dv SO_L2CAP_OFLOW
Get (set) outgoing flow specification for the socket.
.Em Not implemented at the L2CAP layer .
.It Dv SO_L2CAP_FLUSH
Get (set) value of the flush timeout.
.Em Not implemeted at the L2CAP layer .
.El
.Pp
.Sh 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 */
        u_int8_t rfcomm_channel; /* channel */
};
.Ed
.Pp
.Ss 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 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 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 SO_RFCOMM_FC_INFO
Return the flow control information for the underlying RFCOMM channel.
.El
.Pp
The
.Dv 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.
.Pp
.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 BUGS
Most likely. Please report if found.
.Sh SEE ALSO
.Xr socket 2 ,
.Xr netgraph 4 ,
.Xr ngctl 8 ,
.Xr sysctl 8 ,
.Xr ng_bluetooth 4 ,
.Xr ng_hci 4 ,
.Xr ng_l2cap 4 ,
.Xr btsockstat 1
.Sh HISTORY
The
.Nm
module was implemented in
.Fx 5.0 .
.Sh AUTHORS
.An Maksim Yevmenkin Aq m_evmenkin@yahoo.com