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nuttx/net/ieee802154/ieee802154_input.c

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/****************************************************************************
* net/ieee802154/ieee802154_input.c
* Handle incoming IEEE 802.15.4 frame input
*
* Copyright (C) 2017 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. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <string.h>
#include <assert.h>
#include <debug.h>
#include <nuttx/mm/iob.h>
#include <nuttx/net/radiodev.h>
#include <nuttx/net/ieee802154.h>
#include "devif/devif.h"
#include "ieee802154/ieee802154.h"
#ifdef CONFIG_NET_IEEE802154
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: ieee802154_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_IEEE802154_BACKLOG > 0
static int ieee802154_count_frames(FAR struct ieee802154_conn_s *conn)
{
FAR struct ieee802154_container_s *container;
int count;
for (count = 0, container = conn->rxhead;
container != NULL;
count++, container = container->ic_flink)
{
}
return count;
}
#endif
/****************************************************************************
* Name: ieee802154_queue_frame
*
* Description:
* Add one frame to the connection's RX queue.
*
* Input Parameters:
* conn - The socket connection structure.
* framel - A single frame to add to the RX queue.
* meta - Meta data characterizing the received frame.
*
* Returned Value:
* Zero (OK) is returned on success; A negated errno value is returned on
* any failure.
*
****************************************************************************/
static int ieee802154_queue_frame(FAR struct ieee802154_conn_s *conn,
FAR struct iob_s *frame,
FAR struct ieee802154_data_ind_s *meta)
{
FAR struct ieee802154_container_s *container;
/* Allocate a container for the frame */
container = ieee802154_container_allocate();
if (container == NULL)
{
nerr("ERROR: Failed to allocate a container\n");
return -ENOMEM;
}
/* Initialize the container */
memset(&container->ic_src, 0, sizeof(struct ieee802154_saddr_s));
DEBUGASSERT(meta->src.mode != IEEE802154_ADDRMODE_NONE);
container->ic_src.s_mode = meta->src.mode;
IEEE802154_PANIDCOPY(container->ic_src.s_panid, meta->src.panid);
if (meta->src.mode == IEEE802154_ADDRMODE_SHORT)
{
IEEE802154_SADDRCOPY(container->ic_src.s_saddr, meta->src.saddr);
}
else if (meta->src.mode == IEEE802154_ADDRMODE_EXTENDED)
{
IEEE802154_EADDRCOPY(container->ic_src.s_eaddr, meta->src.eaddr);
}
DEBUGASSERT(frame != NULL);
container->ic_iob = frame;
/* Add the container to the tail of the list of incoming frames */
container->ic_flink = NULL;
if (conn->rxtail == NULL)
{
conn->rxhead = container;
}
else
{
conn->rxtail->ic_flink = container;
}
#if CONFIG_NET_IEEE802154_BACKLOG > 0
/* If incrementing the count would exceed the maximum backlog value, then
* delete the oldest frame from the head of the RX queue.
*/
if (conn->backlog >= CONFIG_NET_IEEE802154_BACKLOG)
{
DEBUGASSERT(conn->backlog == CONFIG_NET_IEEE802154_BACKLOG);
/* Remove the container from the tail RX input queue. */
container = conn->rxhead;
DEBUGASSERT(container != NULL);
conn->rxhead = container->ic_flink;
container->ic_flink = NULL;
/* Did the RX queue become empty? */
if (conn->rxhead == NULL)
{
conn->rxtail = NULL;
}
DEBUGASSERT(container != NULL && container->ic_iob != NULL);
/* Free both the IOB and the container */
iob_free(container->ic_iob);
ieee802154_container_free(container);
}
else
{
/* Increment the count of frames in the queue. */
conn->backlog++;
}
DEBUGASSERT((int)conn->backlog == ieee802154_count_frames(conn));
#endif
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: ieee802154_input
*
* Description:
* Handle incoming IEEE 802.15.4 input
*
* This function is called when the radio device driver has received an
* frame from the network. The frame from the device driver must be
* provided in by the IOB frame argument of the function call:
*
* - The frame data is in the IOB io_data[] buffer,
* - The length of the frame is in the IOB io_len field, and
* - The offset past and radio MAC header is provided in the io_offset
* field.
*
* The frame argument may refer to a single frame (a list of length one)
* or may it be the head of a list of multiple frames.
*
* - The io_flink field points to the next frame in the list (if enable)
* - The last frame in the list will have io_flink == NULL.
*
* Input Parameters:
* radio The radio network driver interface.
* framelist - The head of an incoming list of frames. Normally this
* would be a single frame. A list may be provided if
* appropriate, however.
* meta - Meta data characterizing the received frame.
*
* If there are multiple frames in the list, this metadata
* must apply to all of the frames in the list.
*
* Returned Value:
* OK The IEEE 802.15.4 has been processed and can be deleted
* ERROR Hold the IEEE 802.15.4 and try again later. There is a listening
* socket but no recv in place to catch the IEEE 802.15.4 yet.
* Useful when a packet arrives before a recv call is in place.
*
* Assumptions:
* Called from the network diver with the network locked.
*
****************************************************************************/
int ieee802154_input(FAR struct radio_driver_s *radio,
FAR struct iob_s *framelist,
FAR struct ieee802154_data_ind_s *meta)
{
FAR struct ieee802154_conn_s *conn;
FAR struct iob_s *frame;
FAR struct iob_s *next;
int ret = OK;
/* Check if there is a connection that will accept this packet */
conn = ieee802154_conn_active(meta);
if (conn != NULL)
{
/* Setup for the application callback (NOTE: These should not be
* used by PF_IEEE802154 sockets).
*/
radio->r_dev.d_appdata = radio->r_dev.d_buf;
radio->r_dev.d_len = 0;
radio->r_dev.d_sndlen = 0;
/* The framelist probably contains only a single frame, but we will
* process it as a list of frames.
*/
for (frame = framelist; frame != NULL; frame = next)
{
/* Remove the frame from the list */
next = frame->io_flink;
frame->io_flink = NULL;
/* Add the frame to the RX queue */
ret = ieee802154_queue_frame(conn, frame, meta);
if (ret < 0)
{
nerr("ERROR: Failed to queue frame: %d\n", ret);
iob_free(frame);
}
}
/* Perform the application callback. The frame may be processed now
* if there is a user wait for an incoming frame. Or it may pend in
* the RX queue until some user process reads the frame. NOTE: The
* return value from ieee802154_callback would distinguish these
* cases: IEEE802154_NEWDATA will still be processed if the frame
* was not consumed.
*/
(void)ieee802154_callback(radio, conn, IEEE802154_NEWDATA);
}
else
{
nwarn("WARNING: No listener\n");
}
return ret;
}
#endif /* CONFIG_NET_IEEE802154 */
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