422 lines
13 KiB
C
422 lines
13 KiB
C
/****************************************************************************
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* net/socket/ieee802154_recvfrom.c
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*
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* Copyright (C) 2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <stdint.h>
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#include <string.h>
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#include <errno.h>
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#include <debug.h>
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#include <assert.h>
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#include <arch/irq.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/mm/iob.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/radiodev.h>
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#include <netpacket/ieee802154.h>
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#include "netdev/netdev.h"
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#include "devif/devif.h"
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#include "socket/socket.h"
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#include "ieee802154/ieee802154.h"
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#ifdef CONFIG_NET_IEEE802154
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct ieee802154_recvfrom_s
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{
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FAR struct socket *ir_sock; /* Points to the parent socket structure */
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FAR struct devif_callback_s *ir_cb; /* Reference to callback instance */
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FAR struct sockaddr *ir_from; /* Location to return the from address */
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FAR uint8_t *ir_buffer; /* Pointer to receive buffer */
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size_t ir_buflen; /* Length of receive buffer */
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sem_t ir_sem; /* Semaphore signals recv completion */
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ssize_t ir_result; /* Success:size, failure:negated errno */
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ieee802154_count_frames
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*
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* Description:
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* Return the number of frames in the RX queue.
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*
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* Input Parameters:
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* conn - The socket connection structure.
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*
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* Returned Value:
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* The number of frames in the queue.
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*
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****************************************************************************/
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#if defined(CONFIG_DEBUG_ASSERTIONS) && CONFIG_NET_IEEE802154_BACKLOG > 0
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static int ieee802154_count_frames(FAR struct ieee802154_conn_s *conn)
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{
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FAR struct ieee802154_container_s *container;
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int count;
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for (count = 0, container = conn->rxhead;
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container != NULL;
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count++, container = container->ic_flink)
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{
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}
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return count;
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}
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#endif
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/****************************************************************************
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* Name: ieee802154_recvfrom_sender
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*
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* Description:
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* Perform the reception operation if there are any queued frames in the
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* RX frame queue.
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*
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* Input Parameters:
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*
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* Returned Value:
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*
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* Assumptions:
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* The network is lockec
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*
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****************************************************************************/
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static ssize_t ieee802154_recvfrom_rxqueue(FAR struct radio_driver_s *radio,
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FAR struct ieee802154_recvfrom_s *pstate)
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{
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FAR struct ieee802154_container_s *container;
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FAR struct sockaddr_ieee802154_s *iaddr;
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FAR struct ieee802154_conn_s *conn;
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FAR struct iob_s *iob;
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size_t copylen;
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int ret = -EAGAIN;
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/* Check if there is anything in in the RX input queue */
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DEBUGASSERT(pstate != NULL && pstate->ir_sock != NULL);
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conn = (FAR struct ieee802154_conn_s *)pstate->ir_sock->s_conn;
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DEBUGASSERT(conn != NULL);
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if (conn->rxhead != NULL)
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{
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/* Remove the container from the RX input queue. */
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container = conn->rxhead;
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DEBUGASSERT(container != NULL);
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conn->rxhead = container->ic_flink;
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container->ic_flink = NULL;
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/* Did the RX queue become empty? */
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if (conn->rxhead == NULL)
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{
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conn->rxtail = NULL;
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}
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#if CONFIG_NET_IEEE802154_BACKLOG > 0
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/* Decrement the count of frames in the queue. */
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DEBUGASSERT(conn->backlog > 0);
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conn->backlog--;
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DEBUGASSERT((int)conn->backlog == ieee802154_count_frames(conn));
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#endif
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/* Extract the IOB containing the frame from the container */
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iob = container->ic_iob;
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container->ic_iob = NULL;
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DEBUGASSERT(iob != NULL);
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/* Copy the new packet data into the user buffer */
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copylen = iob->io_len - iob->io_offset;
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memcpy(pstate->ir_buffer, &iob->io_data[iob->io_offset], copylen);
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ninfo("Received %d bytes\n", (int)copylen);
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ret = copylen;
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/* If a 'from' address pointer was supplied, copy the source address
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* in the container there.
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*/
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if (pstate->ir_from != NULL)
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{
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iaddr = (FAR struct sockaddr_ieee802154_s *)pstate->ir_from;
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iaddr->sa_family = AF_IEEE802154;
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memcpy(&iaddr->sa_addr, &container->ic_src,
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sizeof(struct ieee802154_saddr_s));
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}
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/* Free both the IOB and the container */
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iob_free(iob, IOBUSER_NET_SOCK_IEEE802154);
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ieee802154_container_free(container);
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}
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return ret;
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}
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/****************************************************************************
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* Name: ieee802154_recvfrom_eventhandler
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*
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* Description:
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*
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* Input Parameters:
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*
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* Returned Value:
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*
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* Assumptions:
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* The network is locked.
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*
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****************************************************************************/
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static uint16_t ieee802154_recvfrom_eventhandler(FAR struct net_driver_s *dev,
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FAR void *pvconn,
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FAR void *pvpriv,
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uint16_t flags)
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{
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FAR struct ieee802154_recvfrom_s *pstate;
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FAR struct radio_driver_s *radio;
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ssize_t ret;
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ninfo("flags: %04x\n", flags);
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DEBUGASSERT(pvpriv != NULL && dev != NULL && pvconn != NULL);
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/* Ignore polls from non IEEE 802.15.4 network drivers */
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if (dev->d_lltype != NET_LL_IEEE802154)
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{
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return flags;
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}
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/* Make sure that this is the driver to which the socket is bound. */
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#warning Missing logic
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pstate = (FAR struct ieee802154_recvfrom_s *)pvpriv;
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radio = (FAR struct radio_driver_s *)dev;
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/* 'pstate' might be null in some race conditions (?) */
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if (pstate != NULL)
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{
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/* If a new packet is available, then complete the read action. */
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if ((flags & IEEE802154_NEWDATA) != 0)
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{
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/* Attempt to receive the frame */
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ret = ieee802154_recvfrom_rxqueue(radio, pstate);
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if (ret > 0)
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{
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/* Don't allow any further call backs. */
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pstate->ir_cb->flags = 0;
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pstate->ir_cb->priv = NULL;
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pstate->ir_cb->event = NULL;
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pstate->ir_result = ret;
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/* indicate that the data has been consumed */
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flags &= ~IEEE802154_NEWDATA;
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/* Wake up the waiting thread, returning the number of bytes
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* actually read.
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*/
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nxsem_post(&pstate->ir_sem);
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}
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}
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}
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return flags;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ieee802154_recvfrom
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*
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* Description:
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* Implements the socket recvfrom interface for the case of the AF_INET
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* and AF_INET6 address families. ieee802154_recvfrom() receives messages from
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* a socket, and may be used to receive data on a socket whether or not it
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* is connection-oriented.
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*
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* If 'from' is not NULL, and the underlying protocol provides the source
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* address, this source address is filled in. The argument 'fromlen' is
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* initialized to the size of the buffer associated with from, and
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* modified on return to indicate the actual size of the address stored
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* there.
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*
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* Input Parameters:
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* psock A pointer to a NuttX-specific, internal socket structure
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* buf Buffer to receive data
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* len Length of buffer
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* flags Receive flags
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* from Address of source (may be NULL)
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* fromlen The length of the address structure
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*
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* Returned Value:
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* On success, returns the number of characters received. If no data is
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* available to be received and the peer has performed an orderly shutdown,
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* recv() will return 0. Otherwise, on errors, a negated errno value is
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* returned (see recvfrom() for the list of appropriate error values).
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*
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* Assumptions:
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* The network is locked.
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*
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****************************************************************************/
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ssize_t ieee802154_recvfrom(FAR struct socket *psock, FAR void *buf,
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size_t len, int flags, FAR struct sockaddr *from,
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FAR socklen_t *fromlen)
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{
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FAR struct ieee802154_conn_s *conn = (FAR struct ieee802154_conn_s *)psock->s_conn;
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FAR struct radio_driver_s *radio;
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struct ieee802154_recvfrom_s state;
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ssize_t ret;
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/* If a 'from' address has been provided, verify that it is large
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* enough to hold this address family.
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*/
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if (from != NULL && *fromlen < sizeof(struct sockaddr_ieee802154_s))
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{
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return -EINVAL;
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}
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if (psock->s_type != SOCK_DGRAM)
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{
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nerr("ERROR: Unsupported socket type: %d\n", psock->s_type);
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return -EPROTONOSUPPORT;
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}
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/* Perform the packet recvfrom() operation */
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/* Initialize the state structure. This is done with the network
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* locked because we don't want anything to happen until we are ready.
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*/
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net_lock();
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memset(&state, 0, sizeof(struct ieee802154_recvfrom_s));
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state.ir_buflen = len;
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state.ir_buffer = buf;
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state.ir_sock = psock;
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state.ir_from = from;
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/* Get the device driver that will service this transfer */
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radio = ieee802154_find_device(conn, &conn->laddr);
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if (radio == NULL)
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{
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ret = -ENODEV;
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goto errout_with_lock;
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}
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/* Before we wait for data, let's check if there are already frame(s)
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* waiting in the RX queue.
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*/
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ret = ieee802154_recvfrom_rxqueue(radio, &state);
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if (ret > 0)
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{
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/* Good newe! We have a frame and we are done. */
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net_unlock();
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return ret;
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}
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/* We will have to wait. This semaphore is used for signaling and,
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* hence, should not have priority inheritance enabled.
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*/
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nxsem_init(&state.ir_sem, 0, 0); /* Doesn't really fail */
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nxsem_setprotocol(&state.ir_sem, SEM_PRIO_NONE);
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/* Set up the callback in the connection */
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state.ir_cb = ieee802154_callback_alloc(&radio->r_dev, conn);
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if (state.ir_cb)
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{
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state.ir_cb->flags = (IEEE802154_NEWDATA | IEEE802154_POLL);
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state.ir_cb->priv = (FAR void *)&state;
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state.ir_cb->event = ieee802154_recvfrom_eventhandler;
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/* Wait for either the receive to complete or for an error/timeout to
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* occur. NOTES: (1) net_lockedwait will also terminate if a signal
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* is received, (2) the network is locked! It will be un-locked while
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* the task sleeps and automatically re-locked when the task restarts.
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*/
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net_lockedwait(&state.ir_sem);
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/* Make sure that no further events are processed */
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ieee802154_callback_free(&radio->r_dev, conn, state.ir_cb);
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ret = state.ir_result;
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}
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else
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{
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ret = -EBUSY;
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}
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nxsem_destroy(&state.ir_sem);
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errout_with_lock:
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net_unlock();
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return ret;
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}
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#endif /* CONFIG_NET_IEEE802154 */
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