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incubator-nuttx/net/bluetooth/bluetooth_recvfrom.c

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/****************************************************************************
* net/socket/bluetooth_recvfrom.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 <stdint.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <assert.h>
#include <netpacket/bluetooth.h>
#include <arch/irq.h>
#include <nuttx/semaphore.h>
#include <nuttx/mm/iob.h>
#include <nuttx/net/net.h>
#include <nuttx/net/radiodev.h>
#include <nuttx/net/bluetooth.h>
#include <nuttx/wireless/bluetooth/bt_hci.h>
#include "netdev/netdev.h"
#include "devif/devif.h"
#include "socket/socket.h"
#include "bluetooth/bluetooth.h"
#ifdef CONFIG_NET_BLUETOOTH
/****************************************************************************
* Private Types
****************************************************************************/
struct bluetooth_recvfrom_s
{
FAR struct socket *ir_sock; /* Points to the parent socket structure */
FAR struct devif_callback_s *ir_cb; /* Reference to callback instance */
FAR struct sockaddr *ir_from; /* Location to return the from address */
FAR uint8_t *ir_buffer; /* Pointer to receive buffer */
size_t ir_buflen; /* Length of receive buffer */
sem_t ir_sem; /* Semaphore signals recv completion */
ssize_t ir_result; /* Success:size, failure:negated errno */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: bluetooth_count_frames
*
* Description:
* Return the number of frames in the RX queue.
*
* Input Parameters:
* conn - The socket connection structure.
*
* Returned Value:
* The number of frames in the queue.
*
****************************************************************************/
#if defined(CONFIG_DEBUG_ASSERTIONS) && CONFIG_NET_BLUETOOTH_BACKLOG > 0
static int bluetooth_count_frames(FAR struct bluetooth_conn_s *conn)
{
FAR struct bluetooth_container_s *container;
int count;
for (count = 0, container = conn->bc_rxhead;
container != NULL;
count++, container = container->bn_flink)
{
}
return count;
}
#endif
/****************************************************************************
* Name: bluetooth_recvfrom_sender
*
* Description:
* Perform the reception operation if there are any queued frames in the
* RX frame queue.
*
* Input Parameters:
*
* Returned Value:
*
* Assumptions:
* The network is lockec
*
****************************************************************************/
static ssize_t bluetooth_recvfrom_rxqueue(FAR struct radio_driver_s *radio,
FAR struct bluetooth_recvfrom_s *pstate)
{
FAR struct bluetooth_container_s *container;
FAR struct sockaddr_bt_s *iaddr;
FAR struct bluetooth_conn_s *conn;
FAR struct iob_s *iob;
size_t copylen;
int ret = -EAGAIN;
/* Check if there is anyting in in the RX input queue */
DEBUGASSERT(pstate != NULL && pstate->ir_sock != NULL);
conn = (FAR struct bluetooth_conn_s *)pstate->ir_sock->s_conn;
DEBUGASSERT(conn != NULL);
if (conn->bc_rxhead != NULL)
{
/* Remove the container from the RX input queue. */
container = conn->bc_rxhead;
DEBUGASSERT(container != NULL);
conn->bc_rxhead = container->bn_flink;
container->bn_flink = NULL;
/* Did the RX queue become empty? */
if (conn->bc_rxhead == NULL)
{
conn->bc_rxtail = NULL;
}
#if CONFIG_NET_BLUETOOTH_BACKLOG > 0
/* Decrement the count of frames in the queue. */
DEBUGASSERT(conn->bc_backlog > 0);
conn->bc_backlog--;
DEBUGASSERT((int)conn->bc_backlog == bluetooth_count_frames(conn));
#endif
/* Extract the IOB containing the frame from the container */
iob = container->bn_iob;
container->bn_iob = NULL;
DEBUGASSERT(iob != NULL);
/* Copy the new packet data into the user buffer */
copylen = iob->io_len - iob->io_offset;
memcpy(pstate->ir_buffer, &iob->io_data[iob->io_offset], copylen);
ninfo("Received %d bytes\n", (int)copylen);
ret = copylen;
/* If a 'from' address poiner was supplied, copy the source address
* in the container there.
*/
if (pstate->ir_from != NULL)
{
iaddr = (FAR struct sockaddr_bt_s *)pstate->ir_from;
iaddr->bt_family = AF_BLUETOOTH;
BLUETOOTH_ADDRCOPY(&iaddr->bt_bdaddr, &container->bn_raddr);
iaddr->bt_channel = container->bn_channel;
}
/* Free both the IOB and the container */
iob_free(iob, IOBUSER_NET_SOCK_BLUETOOTH);
bluetooth_container_free(container);
}
return ret;
}
/****************************************************************************
* Name: bluetooth_recvfrom_eventhandler
*
* Description:
*
* Input Parameters:
*
* Returned Value:
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
static uint16_t bluetooth_recvfrom_eventhandler(FAR struct net_driver_s *dev,
FAR void *pvconn,
FAR void *pvpriv,
uint16_t flags)
{
FAR struct bluetooth_recvfrom_s *pstate;
FAR struct radio_driver_s *radio;
ssize_t ret;
ninfo("flags: %04x\n", flags);
DEBUGASSERT(pvpriv != NULL && dev != NULL && pvconn != NULL);
/* Ignore polls from non Bluetooth network drivers */
if (dev->d_lltype != NET_LL_BLUETOOTH)
{
return flags;
}
/* Make sure that this is the driver to which the socket is bound. */
#warning Missing logic
pstate = (FAR struct bluetooth_recvfrom_s *)pvpriv;
radio = (FAR struct radio_driver_s *)dev;
/* 'pstate' might be null in some race conditions (?) */
if (pstate != NULL)
{
/* If a new packet is available, then complete the read action. */
if ((flags & BLUETOOTH_NEWDATA) != 0)
{
/* Attempt to receive the frame */
ret = bluetooth_recvfrom_rxqueue(radio, pstate);
if (ret > 0)
{
/* Don't allow any further call backs. */
pstate->ir_cb->flags = 0;
pstate->ir_cb->priv = NULL;
pstate->ir_cb->event = NULL;
pstate->ir_result = ret;
/* indicate that the data has been consumed */
flags &= ~BLUETOOTH_NEWDATA;
/* Wake up the waiting thread, returning the number of bytes
* actually read.
*/
nxsem_post(&pstate->ir_sem);
}
}
}
return flags;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: bluetooth_recvfrom
*
* Description:
* Implements the socket recvfrom interface for the case of the AF_INET
* and AF_INET6 address families. bluetooth_recvfrom() receives messages from
* a socket, and may be used to receive data on a socket whether or not it
* is connection-oriented.
*
* If 'from' is not NULL, and the underlying protocol provides the source
* address, this source address is filled in. The argument 'fromlen' is
* initialized to the size of the buffer associated with from, and
* modified on return to indicate the actual size of the address stored
* there.
*
* Input Parameters:
* psock A pointer to a NuttX-specific, internal socket structure
* buf Buffer to receive data
* len Length of buffer
* flags Receive flags
* from Address of source (may be NULL)
* fromlen The length of the address structure
*
* Returned Value:
* On success, returns the number of characters received. If no data is
* available to be received and the peer has performed an orderly shutdown,
* recv() will return 0. Otherwise, on errors, a negated errno value is
* returned (see recvfrom() for the list of appropriate error values).
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
ssize_t bluetooth_recvfrom(FAR struct socket *psock, FAR void *buf,
size_t len, int flags, FAR struct sockaddr *from,
FAR socklen_t *fromlen)
{
FAR struct bluetooth_conn_s *conn = (FAR struct bluetooth_conn_s *)psock->s_conn;
FAR struct radio_driver_s *radio;
struct bluetooth_recvfrom_s state;
ssize_t ret;
/* If a 'from' address has been provided, verify that it is large
* enough to hold this address family.
*/
if (from != NULL && *fromlen < sizeof(struct sockaddr_bt_s))
{
return -EINVAL;
}
if (psock->s_type != SOCK_RAW)
{
nerr("ERROR: Unsupported socket type: %d\n", psock->s_type);
return -EPROTONOSUPPORT;
}
/* Perform the packet recvfrom() operation */
/* Initialize the state structure. This is done with the network
* locked because we don't want anything to happen until we are ready.
*/
net_lock();
memset(&state, 0, sizeof(struct bluetooth_recvfrom_s));
state.ir_buflen = len;
state.ir_buffer = buf;
state.ir_sock = psock;
state.ir_from = from;
/* Get the device driver that will service this transfer */
radio = bluetooth_find_device(conn, &conn->bc_laddr);
if (radio == NULL)
{
ret = -ENODEV;
goto errout_with_lock;
}
/* Before we wait for data, let's check if there are already frame(s)
* waiting in the RX queue.
*/
ret = bluetooth_recvfrom_rxqueue(radio, &state);
if (ret > 0)
{
/* Good newe! We have a frame and we are done. */
net_unlock();
return ret;
}
/* We will have to wait. This semaphore is used for signaling and,
* hence, should not have priority inheritance enabled.
*/
nxsem_init(&state.ir_sem, 0, 0); /* Doesn't really fail */
nxsem_setprotocol(&state.ir_sem, SEM_PRIO_NONE);
/* Set up the callback in the connection */
state.ir_cb = bluetooth_callback_alloc(&radio->r_dev, conn);
if (state.ir_cb)
{
state.ir_cb->flags = (BLUETOOTH_NEWDATA | BLUETOOTH_POLL);
state.ir_cb->priv = (FAR void *)&state;
state.ir_cb->event = bluetooth_recvfrom_eventhandler;
/* Wait for either the receive to complete or for an error/timeout to
* occur. NOTES: (1) net_lockedwait will also terminate if a signal
* is received, (2) the network is locked! It will be un-locked while
* the task sleeps and automatically re-locked when the task restarts.
*/
net_lockedwait(&state.ir_sem);
/* Make sure that no further events are processed */
bluetooth_callback_free(&radio->r_dev, conn, state.ir_cb);
ret = state.ir_result;
}
else
{
ret = -EBUSY;
}
nxsem_destroy(&state.ir_sem);
errout_with_lock:
net_unlock();
return ret;
}
#endif /* CONFIG_NET_BLUETOOTH */
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