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incubator-nuttx/net/bluetooth/bluetooth_sendmsg.c

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/****************************************************************************
* net/bluetooth/bluetooth_sendmsg.c
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <debug.h>
#include <netpacket/bluetooth.h>
#include <arch/irq.h>
#include <nuttx/semaphore.h>
#include <nuttx/mm/iob.h>
#include <nuttx/net/radiodev.h>
#include <nuttx/net/bluetooth.h>
#include <nuttx/net/net.h>
#include <nuttx/net/ip.h>
#include <nuttx/wireless/bluetooth/bt_hci.h>
#include "utils/utils.h"
#include "netdev/netdev.h"
#include "devif/devif.h"
#include "socket/socket.h"
#include "bluetooth/bluetooth.h"
#ifdef CONFIG_NET_BLUETOOTH
/****************************************************************************
* Private Types
****************************************************************************/
/* This structure holds the state of the send operation until it can be
* operated upon from the event handler.
*/
struct bluetooth_sendto_s
{
FAR struct socket *is_sock; /* Points to the parent socket structure */
FAR struct devif_callback_s *is_cb; /* Reference to callback instance */
bt_addr_t is_destaddr; /* Frame destination address */
uint16_t is_channel; /* Frame destination channel */
sem_t is_sem; /* Used to wake up the waiting thread */
FAR const uint8_t *is_buffer; /* User buffer of data to send */
size_t is_buflen; /* Number of bytes in the is_buffer */
ssize_t is_sent; /* The number of bytes sent (or error) */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: bluetooth_sendto_eventhandler
****************************************************************************/
static uint16_t bluetooth_sendto_eventhandler(FAR struct net_driver_s *dev,
FAR void *pvpriv,
uint16_t flags)
{
FAR struct radio_driver_s *radio;
FAR struct bluetooth_sendto_s *pstate;
struct bluetooth_frame_meta_s meta;
FAR struct iob_s *iob;
int hdrlen;
int ret;
DEBUGASSERT(pvpriv != NULL && dev != 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 connected. */
/* #warning Missing logic */
pstate = pvpriv;
radio = (FAR struct radio_driver_s *)dev;
ninfo("flags: %04x sent: %zd\n", flags, pstate->is_sent);
if (pstate != NULL && (flags & BLUETOOTH_POLL) != 0)
{
/* Initialize the meta data */
BLUETOOTH_ADDRCOPY(&meta.bm_raddr, &pstate->is_destaddr);
meta.bm_channel = pstate->is_channel;
meta.bm_proto = pstate->is_sock->s_proto;
/* Get the Bluetooth MAC header length */
hdrlen = radio->r_get_mhrlen(radio, &meta);
if (hdrlen < 0)
{
nerr("ERROR: Failed to get header length: %d\n", hdrlen);
ret = hdrlen;
goto errout;
}
/* Verify that the user buffer can fit within the frame with this
* MAC header.
*/
DEBUGASSERT(BLUETOOTH_MAX_FRAMELEN <= CONFIG_IOB_BUFSIZE);
if (pstate->is_buflen + hdrlen > BLUETOOTH_MAX_FRAMELEN)
{
nerr("ERROR: User buffer will not fit into the frame: %u > %u\n",
(unsigned int)(pstate->is_buflen + hdrlen),
(unsigned int)CONFIG_IOB_BUFSIZE);
ret = -E2BIG;
goto errout;
}
/* Allocate an IOB to hold the frame data */
iob = net_ioballoc(false);
if (iob == NULL)
{
nwarn("WARNING: Failed to allocate IOB\n");
return flags;
}
/* Initialize the IOB */
iob->io_offset = hdrlen;
iob->io_len = pstate->is_buflen + hdrlen;
iob->io_pktlen = pstate->is_buflen + hdrlen;
/* Copy the user data into the IOB */
memcpy(&iob->io_data[hdrlen], pstate->is_buffer, pstate->is_buflen);
/* And submit the IOB to the network driver */
ret = radio->r_req_data(radio, &meta, iob);
if (ret < 0)
{
nerr("ERROR: r_req_data() failed: %d\n", ret);
goto errout;
}
/* Save the successful result */
pstate->is_sent = pstate->is_buflen;
/* Don't allow any further call backs. */
pstate->is_cb->flags = 0;
pstate->is_cb->priv = NULL;
pstate->is_cb->event = NULL;
/* Wake up the waiting thread */
nxsem_post(&pstate->is_sem);
}
return flags;
errout:
/* Don't allow any further call backs. */
pstate->is_cb->flags = 0;
pstate->is_cb->priv = NULL;
pstate->is_cb->event = NULL;
pstate->is_sent = ret;
/* Wake up the waiting thread */
nxsem_post(&pstate->is_sem);
return flags;
}
/****************************************************************************
* Name: bluetooth_sendto
*
* Description:
* If sendto() is used on a connection-mode (SOCK_STREAM, SOCK_SEQPACKET)
* socket, the parameters to and 'tolen' are ignored (and the error EISCONN
* may be returned when they are not NULL and 0), and the error ENOTCONN is
* returned when the socket was not actually connected.
*
* 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 retruend. See sendto() for the complete list
* of return 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)
{
FAR struct radio_driver_s *radio;
FAR struct bluetooth_conn_s *conn;
struct bluetooth_sendto_s state;
int ret = OK;
/* Only SOCK_RAW is supported */
if (psock->s_type != SOCK_RAW)
{
/* EDESTADDRREQ. Signifies that the socket is not connection-mode and
* no peer address is set.
*/
return -EDESTADDRREQ;
}
/* Verify that the sockfd corresponds to valid, allocated socket */
if (psock == NULL || psock->s_conn == NULL)
{
return -EBADF;
}
conn = psock->s_conn;
/* Verify that the address is large enough to be a valid PF_BLUETOOTH
* address.
*/
if (tolen < sizeof(bt_addr_t))
{
return -EDESTADDRREQ;
}
/* Get the device driver that will service this transfer */
if (psock->s_proto == BTPROTO_L2CAP)
{
radio = bluetooth_find_device(conn, &conn->bc_laddr);
if (radio == NULL)
{
return -ENODEV;
}
}
else if (psock->s_proto == BTPROTO_HCI)
{
/* TODO: should actually look among BT devices */
radio =
(FAR struct radio_driver_s *)netdev_findbyindex(conn->bc_ldev + 1);
DEBUGASSERT(radio->r_dev.d_lltype == NET_LL_BLUETOOTH);
if (radio == NULL)
{
return -ENODEV;
}
}
else
{
return -EOPNOTSUPP;
}
/* Perform the send 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_sendto_s));
nxsem_init(&state.is_sem, 0, 0); /* Doesn't really fail */
state.is_sock = psock; /* Socket descriptor to use */
state.is_buflen = len; /* Number of bytes to send */
state.is_buffer = buf; /* Buffer to send from */
/* Copy the destination address */
if (psock->s_proto == BTPROTO_L2CAP)
{
FAR struct sockaddr_l2 *destaddr = (FAR struct sockaddr_l2 *)to;
memcpy(&state.is_destaddr, &destaddr->l2_bdaddr,
sizeof(bt_addr_t));
}
else if (psock->s_proto == BTPROTO_HCI)
{
FAR struct sockaddr_hci *destaddr = (FAR struct sockaddr_hci *)to;
state.is_channel = destaddr->hci_channel;
}
else
{
ret = -EOPNOTSUPP;
goto err_with_net;
}
if (len > 0)
{
/* Allocate resource to receive a callback */
state.is_cb = bluetooth_callback_alloc(&radio->r_dev, conn);
if (state.is_cb)
{
/* Set up the callback in the connection */
state.is_cb->flags = PKT_POLL;
state.is_cb->priv = (FAR void *)&state;
state.is_cb->event = bluetooth_sendto_eventhandler;
/* Notify the device driver that new TX data is available. */
netdev_txnotify_dev(&radio->r_dev);
/* Wait for the send to complete or an error to occur.
* net_sem_wait will also terminate if a signal is received.
*/
ret = net_sem_wait(&state.is_sem);
/* Make sure that no further events are processed */
bluetooth_callback_free(&radio->r_dev, conn, state.is_cb);
}
}
nxsem_destroy(&state.is_sem);
net_unlock();
/* Check for a errors, Errors are signaled by negative errno values
* for the send length
*/
if (state.is_sent < 0)
{
return state.is_sent;
}
/* If net_sem_wait failed, then we were probably reawakened by a signal.
* In this case, net_sem_wait will have returned negated errno
* appropriately.
*/
if (ret < 0)
{
return ret;
}
/* Return the number of bytes actually sent */
return state.is_sent;
err_with_net:
nxsem_destroy(&state.is_sem);
net_unlock();
return ret;
}
/****************************************************************************
* Name: bluetooth_l2cap_send
*
* Description:
* Socket send() method for the PF_BLUETOOTH socket over BTPROTO_L2CAP.
*
* 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_l2cap_send(FAR struct socket *psock,
FAR const void *buf,
size_t len, int flags)
{
struct sockaddr_l2 to;
FAR struct bluetooth_conn_s *conn;
ssize_t ret;
conn = psock->s_conn;
if (!_SS_ISCONNECTED(conn->bc_conn.s_flags))
{
ret = -ENOTCONN;
}
else
{
to.l2_family = AF_BLUETOOTH;
memcpy(&to.l2_bdaddr, &conn->bc_raddr, sizeof(bt_addr_t));
to.l2_cid = conn->bc_channel;
/* Then perform the send() as sendto() */
ret = bluetooth_sendto(psock, buf, len, flags,
(FAR const struct sockaddr *)&to,
sizeof(struct sockaddr_l2));
}
return ret;
}
/****************************************************************************
* Name: bluetooth_hci_send
*
* Description:
* Socket send() method for the PF_BLUETOOTH socket over BTPROTO_HCI.
*
* 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_hci_send(FAR struct socket *psock,
FAR const void *buf,
size_t len, int flags)
{
/* We only support sendto() for HCI sockets */
return -EPFNOSUPPORT;
}
/****************************************************************************
* 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)
{
ssize_t ret;
/* Only SOCK_RAW is supported */
if (psock->s_type == SOCK_RAW)
{
switch (psock->s_proto)
{
case BTPROTO_L2CAP:
{
ret = bluetooth_l2cap_send(psock, buf, len, flags);
break;
}
case BTPROTO_HCI:
{
ret = bluetooth_hci_send(psock, buf, len, flags);
break;
}
default:
ret = -EPFNOSUPPORT;
}
}
else
{
ret = -EINVAL;
}
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: bluetooth_sendmsg
*
* Description:
* If sendmsg() is used on a connection-mode (SOCK_STREAM, SOCK_SEQPACKET)
* socket, the parameters 'msg_name' and 'msg_namelen' are ignored (and the
* error EISCONN may be returned when they are not NULL and 0), and the
* error ENOTCONN is returned when the socket was not actually connected.
*
* Input Parameters:
* psock A pointer to a NuttX-specific, internal socket structure
* msg 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 sendmsg() for the complete list
* of return values.
*
****************************************************************************/
ssize_t bluetooth_sendmsg(FAR struct socket *psock, FAR struct msghdr *msg,
int flags)
{
FAR const void *buf = msg->msg_iov->iov_base;
size_t len = msg->msg_iov->iov_len;
FAR const struct sockaddr *to = msg->msg_name;
socklen_t tolen = msg->msg_namelen;
/* Validity check, only single iov supported */
if (msg->msg_iovlen != 1)
{
return -ENOTSUP;
}
return to ? bluetooth_sendto(psock, buf, len, flags, to, tolen) :
bluetooth_send(psock, buf, len, flags);
}
#endif /* CONFIG_NET_BLUETOOTH */
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