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incubator-nuttx/net/bluetooth/bluetooth_sockif.c

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/****************************************************************************
* net/socket/bluetooth_sockif.c
*
* Copyright (C) 2018 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
* COPYRIGHT OWNER 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdbool.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <socket/socket.h>
#include <netpacket/bluetooth.h>
#include <nuttx/net/net.h>
#include <nuttx/net/radiodev.h>
#include <nuttx/net/bluetooth.h>
#include <nuttx/wireless/bluetooth/bt_hci.h>
#include "bluetooth/bluetooth.h"
#ifdef CONFIG_NET_BLUETOOTH
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int bluetooth_setup(FAR struct socket *psock, int protocol);
static sockcaps_t bluetooth_sockcaps(FAR struct socket *psock);
static void bluetooth_addref(FAR struct socket *psock);
static int bluetooth_bind(FAR struct socket *psock,
FAR const struct sockaddr *addr, socklen_t addrlen);
static int bluetooth_getsockname(FAR struct socket *psock,
FAR struct sockaddr *addr, FAR socklen_t *addrlen);
static int bluetooth_getpeername(FAR struct socket *psock,
FAR struct sockaddr *addr, FAR socklen_t *addrlen);
static int bluetooth_listen(FAR struct socket *psock, int backlog);
static int bluetooth_connect(FAR struct socket *psock,
FAR const struct sockaddr *addr, socklen_t addrlen);
static int bluetooth_accept(FAR struct socket *psock,
FAR struct sockaddr *addr, FAR socklen_t *addrlen,
FAR struct socket *newsock);
#ifndef CONFIG_DISABLE_POLL
static int bluetooth_poll_local(FAR struct socket *psock,
FAR struct pollfd *fds, bool setup);
#endif
static ssize_t bluetooth_send(FAR struct socket *psock,
FAR const void *buf, size_t len, int flags);
static ssize_t bluetooth_sendto(FAR struct socket *psock,
FAR const void *buf, size_t len, int flags,
FAR const struct sockaddr *to, socklen_t tolen);
static int bluetooth_close(FAR struct socket *psock);
/****************************************************************************
* Public Data
****************************************************************************/
const struct sock_intf_s g_bluetooth_sockif =
{
bluetooth_setup, /* si_setup */
bluetooth_sockcaps, /* si_sockcaps */
bluetooth_addref, /* si_addref */
bluetooth_bind, /* si_bind */
bluetooth_getsockname, /* si_getsockname */
bluetooth_getpeername, /* si_getpeername */
bluetooth_listen, /* si_listen */
bluetooth_connect, /* si_connect */
bluetooth_accept, /* si_accept */
#ifndef CONFIG_DISABLE_POLL
bluetooth_poll_local, /* si_poll */
#endif
bluetooth_send, /* si_send */
bluetooth_sendto, /* si_sendto */
#ifdef CONFIG_NET_SENDFILE
NULL, /* si_sendfile */
#endif
bluetooth_recvfrom, /* si_recvfrom */
bluetooth_close /* si_close */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: bluetooth_sockif_alloc
*
* Description:
* Allocate and attach a PF_BLUETOOTH connection structure.
*
* Assumptions:
* The network is locked
*
****************************************************************************/
static int bluetooth_sockif_alloc(FAR struct socket *psock)
{
/* Allocate the packet socket connection structure and save in the new
* socket instance.
*/
FAR struct bluetooth_conn_s *conn = bluetooth_conn_alloc();
if (conn == NULL)
{
/* Failed to reserve a connection structure */
return -ENOMEM;
}
/* Set the reference count on the connection structure. This reference
* count will be incremented only if the socket is dup'ed
*/
DEBUGASSERT(conn->bc_crefs == 0);
conn->bc_crefs = 1;
/* Save the pre-allocated connection in the socket structure */
psock->s_conn = conn;
return OK;
}
/****************************************************************************
* Name: bluetooth_setup
*
* Description:
* Called for socket() to verify that the provided socket type and
* protocol are usable by this address family. Perform any family-
* specific socket fields.
*
* Input Parameters:
* psock A pointer to a user allocated socket structure to be
* initialized.
* protocol (see sys/socket.h)
*
* Returned Value:
* Zero (OK) is returned on success. Otherwise, a negated errno value is
* returned.
*
****************************************************************************/
static int bluetooth_setup(FAR struct socket *psock, int protocol)
{
/* Allocate the appropriate connection structure. This reserves the
* the connection structure is is unallocated at this point. It will
* not actually be initialized until the socket is connected.
*
* Only SOCK_RAW is supported
*/
if (psock->s_type == SOCK_RAW)
{
return bluetooth_sockif_alloc(psock);
}
else
{
return -EPROTONOSUPPORT;
}
}
/****************************************************************************
* Name: bluetooth_sockcaps
*
* Description:
* Return the bit encoded capabilities of this socket.
*
* Input Parameters:
* psock - Socket structure of the socket whose capabilities are being
* queried.
*
* Returned Value:
* The set of socket cababilities is returned.
*
****************************************************************************/
static sockcaps_t bluetooth_sockcaps(FAR struct socket *psock)
{
return 0;
}
/****************************************************************************
* Name: bluetooth_addref
*
* Description:
* Increment the refernce count on the underlying connection structure.
*
* Input Parameters:
* psock - Socket structure of the socket whose reference count will be
* incremented.
*
* Returned Value:
* None
*
****************************************************************************/
static void bluetooth_addref(FAR struct socket *psock)
{
FAR struct bluetooth_conn_s *conn;
DEBUGASSERT(psock != NULL && psock->s_conn != NULL &&
psock->s_type == SOCK_RAW);
conn = (FAR struct bluetooth_conn_s *)psock->s_conn;
DEBUGASSERT(conn->bc_crefs > 0 && conn->bc_crefs < 255);
conn->bc_crefs++;
}
/****************************************************************************
* Name: bluetooth_connect
*
* Description:
* bluetooth_connect() connects the local socket referred to by the structure
* 'psock' to the address specified by 'addr'. The addrlen argument
* specifies the size of 'addr'. The format of the address in 'addr' is
* determined by the address space of the socket 'psock'.
*
* Generally, connection-based protocol sockets may successfully
* bluetooth_connect() only once; connectionless protocol sockets may use
* bluetooth_connect() multiple times to change their association.
* Connectionless sockets may dissolve the association by connecting to
* an address with the bt_family member of sockaddr set to AF_UNSPEC.
*
* Input Parameters:
* psock Pointer to a socket structure initialized by psock_socket()
* addr Server address (form depends on type of socket)
* addrlen Length of actual 'addr'
*
* Returned Value:
* 0 on success; a negated errno value on failue. See connect() for the
* list of appropriate errno values to be returned.
*
****************************************************************************/
static int bluetooth_connect(FAR struct socket *psock,
FAR const struct sockaddr *addr,
socklen_t addrlen)
{
FAR struct bluetooth_conn_s *conn;
FAR struct sockaddr_bt_s *btaddr;
int ret;
DEBUGASSERT(psock != NULL || addr != NULL);
conn = (FAR struct bluetooth_conn_s *)psock->s_conn;
DEBUGASSERT(conn != NULL);
/* Verify the address family */
if (addr->sa_family == AF_BLUETOOTH)
{
/* Save the "connection" address */
btaddr = (FAR struct sockaddr_bt_s *)addr;
memcpy(&conn->bc_raddr, &btaddr->bt_bdaddr, sizeof(bt_addr_t));
conn->bc_channel = btaddr->bt_channel;
/* Mark the socket as connected. */
psock->s_flags |= _SF_CONNECTED;
ret = OK;
}
else
{
/* The specified address is not a valid address for the address family
* of the specified socket.
*/
ret = -EAFNOSUPPORT;
}
return ret;
}
/****************************************************************************
* Name: bluetooth_accept
*
* Description:
* The bluetooth_accept function is used with connection-based socket types
* (SOCK_STREAM, SOCK_SEQPACKET and SOCK_RDM). It extracts the first
* connection request on the queue of pending connections, creates a new
* connected socket with mostly the same properties as 'sockfd', and
* allocates a new socket descriptor for the socket, which is returned. The
* newly created socket is no longer in the listening state. The original
* socket 'sockfd' is unaffected by this call. Per file descriptor flags
* are not inherited across an bluetooth_accept.
*
* The 'sockfd' argument is a socket descriptor that has been created with
* socket(), bound to a local address with bind(), and is listening for
* connections after a call to listen().
*
* On return, the 'addr' structure is filled in with the address of the
* connecting entity. The 'addrlen' argument initially contains the size
* of the structure pointed to by 'addr'; on return it will contain the
* actual length of the address returned.
*
* If no pending connections are present on the queue, and the socket is
* not marked as non-blocking, bluetooth_accept blocks the caller until a
* connection is present. If the socket is marked non-blocking and no
* pending connections are present on the queue, bluetooth_accept returns
* EAGAIN.
*
* Input Parameters:
* psock Reference to the listening socket structure
* addr Receives the address of the connecting client
* addrlen Input: allocated size of 'addr', Return: returned size of 'addr'
* newsock Location to return the accepted socket information.
*
* Returned Value:
* Returns 0 (OK) on success. On failure, it returns a negated errno
* value. See accept() for a desrciption of the approriate error value.
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
static int bluetooth_accept(FAR struct socket *psock,
FAR struct sockaddr *addr,
FAR socklen_t *addrlen,
FAR struct socket *newsock)
{
return -EAFNOSUPPORT;
}
/****************************************************************************
* Name: bluetooth_bind
*
* Description:
* bluetooth_bind() gives the socket 'psock' the local address 'addr'.
* 'addr' is 'addrlen' bytes long. Traditionally, this is called
* "assigning a name to a socket." When a socket is created with
* socket(), it exists in a name space (address family) but has no name
* assigned.
*
* Input Parameters:
* psock Socket structure of the socket to bind
* addr Socket local address
* addrlen Length of 'addr'
*
* Returned Value:
* 0 on success; A negated errno value is returned on failure. See
* bind() for a list a appropriate error values.
*
****************************************************************************/
static int bluetooth_bind(FAR struct socket *psock,
FAR const struct sockaddr *addr, socklen_t addrlen)
{
FAR const struct sockaddr_bt_s *iaddr;
FAR struct radio_driver_s *radio;
FAR struct bluetooth_conn_s *conn;
DEBUGASSERT(psock != NULL && addr != NULL);
/* Verify that a valid address has been provided */
if (addr->sa_family != AF_BLUETOOTH ||
addrlen < sizeof(struct sockaddr_bt_s))
{
nerr("ERROR: Invalid family: %u or address length: %d < %d\n",
addr->sa_family, addrlen, sizeof(struct sockaddr_bt_s));
return -EBADF;
}
/* Bind a PF_BLUETOOTH socket to an network device.
*
* Only SOCK_RAW is supported
*/
if (psock->s_type != SOCK_RAW)
{
nerr("ERROR: Invalid socket type: %u\n", psock->s_type);
return -EBADF;
}
/* Verify that the socket is not already bound. */
if (_SS_ISBOUND(psock->s_flags))
{
nerr("ERROR: Already bound\n");
return -EINVAL;
}
iaddr = (FAR const struct sockaddr_bt_s *)addr;
/* Very that some address was provided */
/* REVISIT: Currently and explict address must be assigned. Should we
* support some moral equivalent to INADDR_ANY?
*/
conn = (FAR struct bluetooth_conn_s *)psock->s_conn;
/* Find the device associated with the requested address */
radio = bluetooth_find_device(conn, &iaddr->bt_bdaddr);
if (radio == NULL)
{
nerr("ERROR: No radio at this address\n");
return -ENODEV;
}
/* Save the address as the socket's local address */
memcpy(&conn->bc_laddr, &iaddr->bt_bdaddr, sizeof(bt_addr_t));
/* Mark the socket bound */
psock->s_flags |= _SF_BOUND;
return OK;
}
/****************************************************************************
* Name: bluetooth_getsockname
*
* Description:
* The bluetooth_getsockname() function retrieves the locally-bound name of the
* specified packet socket, stores this address in the sockaddr structure
* pointed to by the 'addr' argument, and stores the length of this
* address in the object pointed to by the 'addrlen' argument.
*
* If the actual length of the address is greater than the length of the
* supplied sockaddr structure, the stored address will be truncated.
*
* If the socket has not been bound to a local name, the value stored in
* the object pointed to by address is unspecified.
*
* Input Parameters:
* psock Socket structure of the socket to be queried
* addr sockaddr structure to receive data [out]
* addrlen Length of sockaddr structure [in/out]
*
* Returned Value:
* On success, 0 is returned, the 'addr' argument points to the address
* of the socket, and the 'addrlen' argument points to the length of the
* address. Otherwise, a negated errno value is returned. See
* getsockname() for the list of appropriate error numbers.
*
****************************************************************************/
static int bluetooth_getsockname(FAR struct socket *psock,
FAR struct sockaddr *addr, FAR
socklen_t *addrlen)
{
FAR struct bluetooth_conn_s *conn;
FAR struct sockaddr_bt_s tmp;
socklen_t copylen;
DEBUGASSERT(psock != NULL && addr != NULL && addrlen != NULL);
conn = (FAR struct bluetooth_conn_s *)psock->s_conn;
DEBUGASSERT(conn != NULL);
/* Create a copy of the full address on the stack */
tmp.bt_family = AF_BLUETOOTH;
memcpy(&tmp.bt_bdaddr, &conn->bc_laddr, sizeof(bt_addr_t));
/* Copy to the user buffer, truncating if necessary */
copylen = sizeof(struct sockaddr_bt_s);
if (copylen > *addrlen)
{
copylen = *addrlen;
}
memcpy(addr, &tmp, copylen);
/* Return the actual size transferred */
*addrlen = copylen;
return OK;
}
/****************************************************************************
* Name: bluetooth_getpeername
*
* Description:
* The bluetooth_getpeername() function retrieves the remote-connected name of
* the specified local socket, stores this address in the sockaddr
* structure pointed to by the 'addr' argument, and stores the length of
* this address in the object pointed to by the 'addrlen' argument.
*
* If the actual length of the address is greater than the length of the
* supplied sockaddr structure, the stored address will be truncated.
*
* If the socket has not been bound to a local name, the value stored in
* the object pointed to by address is unspecified.
*
* Parameters:
* psock Socket structure of the socket to be queried
* addr sockaddr structure to receive data [out]
* addrlen Length of sockaddr structure [in/out]
*
* Returned Value:
* On success, 0 is returned, the 'addr' argument points to the address
* of the socket, and the 'addrlen' argument points to the length of the
* address. Otherwise, a negated errno value is returned. See
* getpeername() for the list of appropriate error numbers.
*
****************************************************************************/
static int bluetooth_getpeername(FAR struct socket *psock,
FAR struct sockaddr *addr,
FAR socklen_t *addrlen)
{
FAR struct bluetooth_conn_s *conn;
FAR struct sockaddr_bt_s tmp;
socklen_t copylen;
DEBUGASSERT(psock != NULL && addr != NULL && addrlen != NULL);
conn = (FAR struct bluetooth_conn_s *)psock->s_conn;
DEBUGASSERT(conn != NULL);
/* Create a copy of the full address on the stack */
tmp.bt_family = AF_BLUETOOTH;
memcpy(&tmp.bt_bdaddr, &conn->bc_raddr, sizeof(bt_addr_t));
/* Copy to the user buffer, truncating if necessary */
copylen = sizeof(struct sockaddr_bt_s);
if (copylen > *addrlen)
{
copylen = *addrlen;
}
memcpy(addr, &tmp, copylen);
/* Return the actual size transferred */
*addrlen = copylen;
return OK;
}
/****************************************************************************
* Name: bluetooth_listen
*
* Description:
* To accept connections, a socket is first created with psock_socket(), a
* willingness to accept incoming connections and a queue limit for
* incoming connections are specified with psock_listen(), and then the
* connections are accepted with psock_accept(). For the case of
* PF_BLUETOOTH sockets, psock_listen() calls this function. The listen()
* call does not apply only to PF_BLUETOOTH sockets.
*
* Input Parameters:
* psock Reference to an internal, boound socket structure.
* backlog The maximum length the queue of pending connections may grow.
* If a connection request arrives with the queue full, the client
* may receive an error with an indication of ECONNREFUSED or,
* if the underlying protocol supports retransmission, the request
* may be ignored so that retries succeed.
*
* Returned Value:
* On success, zero is returned. On error, a negated errno value is
* returned. See list() for the set of appropriate error values.
*
****************************************************************************/
int bluetooth_listen(FAR struct socket *psock, int backlog)
{
return -EOPNOTSUPP;
}
/****************************************************************************
* Name: bluetooth_poll
*
* Description:
* The standard poll() operation redirects operations on socket descriptors
* to net_poll which, indiectly, calls to function.
*
* Input Parameters:
* psock - An instance of the internal socket structure.
* fds - The structure describing the events to be monitored, OR NULL if
* this is a request to stop monitoring events.
* setup - true: Setup up the poll; false: Teardown the poll
*
* Returned Value:
* 0: Success; Negated errno on failure
*
****************************************************************************/
#ifndef CONFIG_DISABLE_POLL
static int bluetooth_poll_local(FAR struct socket *psock,
FAR struct pollfd *fds, bool setup)
{
/* We should need to support some kind of write ahead buffering for this
* feature.
*/
#warning Missing logic
return -ENOSYS;
}
#endif /* !CONFIG_DISABLE_POLL */
/****************************************************************************
* Name: bluetooth_send
*
* Description:
* Socket send() method for the PF_BLUETOOTH socket.
*
* Input Parameters:
* psock An instance of the internal socket structure.
* buf Data to send
* len Length of data to send
* flags Send flags
*
* Returned Value:
* On success, returns the number of characters sent. On error, a negated
* errno value is returned (see send() for the list of appropriate error
* values.
*
****************************************************************************/
static ssize_t bluetooth_send(FAR struct socket *psock, FAR const void *buf,
size_t len, int flags)
{
struct sockaddr_bt_s to;
FAR struct bluetooth_conn_s *conn;
ssize_t ret;
DEBUGASSERT(psock != NULL || buf != NULL);
conn = (FAR struct bluetooth_conn_s *)psock->s_conn;
DEBUGASSERT(conn != NULL);
/* Only SOCK_RAW is supported */
if (psock->s_type == SOCK_RAW)
{
/* send() may be used only if the socket is has been connected. */
if (!_SS_ISCONNECTED( psock->s_flags))
{
ret = -ENOTCONN;
}
else
{
to.bt_family = AF_BLUETOOTH;
memcpy(&to.bt_bdaddr, &conn->bc_raddr, sizeof(bt_addr_t));
to.bt_channel = conn->bc_channel;
/* Then perform the send() as sendto() */
ret = psock_bluetooth_sendto(psock, buf, len, flags,
(FAR const struct sockaddr *)&to,
sizeof(struct sockaddr_bt_s));
}
}
else
{
/* EDESTADDRREQ. Signifies that the socket is not connection-mode and
* no peer address is set.
*/
ret = -EDESTADDRREQ;
}
return ret;
}
/****************************************************************************
* Name: bluetooth_sendto
*
* Description:
* Implements the sendto() operation for the case of the PF_BLUETOOTH
* socket.
*
* Input Parameters:
* psock A pointer to a NuttX-specific, internal socket structure
* buf Data to send
* len Length of data to send
* flags Send flags
* to Address of recipient
* tolen The length of the address structure
*
* Returned Value:
* On success, returns the number of characters sent. On error, a negated
* errno value is returned (see send_to() for the list of appropriate error
* values.
*
****************************************************************************/
static ssize_t bluetooth_sendto(FAR struct socket *psock, FAR const void *buf,
size_t len, int flags,
FAR const struct sockaddr *to, socklen_t tolen)
{
ssize_t ret;
/* Only SOCK_RAW is supported */
if (psock->s_type == SOCK_RAW)
{
/* Raw packet send */
ret = psock_bluetooth_sendto(psock, buf, len, flags, to, tolen);
}
else
{
/* EDESTADDRREQ. Signifies that the socket is not connection-mode and
* no peer address is set.
*/
ret = -EDESTADDRREQ;
}
return ret;
}
/****************************************************************************
* Name: bluetooth_close
*
* Description:
* Performs the close operation on a PF_BLUETOOTH socket instance
*
* Input Parameters:
* psock Socket instance
*
* Returned Value:
* 0 on success; a negated errno value is returned on any failure.
*
* Assumptions:
*
****************************************************************************/
static int bluetooth_close(FAR struct socket *psock)
{
/* Perform some pre-close operations for the PF_BLUETOOTH address type */
switch (psock->s_type)
{
/* Only SOCK_RAW is supported */
case SOCK_RAW:
{
FAR struct bluetooth_conn_s *conn = psock->s_conn;
/* Is this the last reference to the connection structure (there
* could be more if the socket was dup'ed).
*/
if (conn->bc_crefs <= 1)
{
/* Yes... free the connection structure */
conn->bc_crefs = 0; /* No more references on the connection */
bluetooth_conn_free(psock->s_conn); /* Free network resources */
}
else
{
/* No.. Just decrement the reference count */
conn->bc_crefs--;
}
return OK;
}
default:
return -EBADF;
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
#endif /* CONFIG_NET_BLUETOOTH */
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