/****************************************************************************
* net/icmpv6/icmpv6_netpoll.c
*
* Copyright (C) 2017-2018 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 <stdint.h>
#include <poll.h>
#include <debug.h>
#include <nuttx/semaphore.h>
#include <nuttx/net/net.h>
#include "devif/devif.h"
#include "netdev/netdev.h"
#include "icmpv6/icmpv6.h"
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: icmpv6_poll_eventhandler
*
* Description:
* This function is called to perform the actual UDP receive operation
* via the device interface layer.
*
* Input Parameters:
* dev The structure of the network driver that caused the event
* conn The connection structure associated with the socket
* flags Set of events describing why the callback was invoked
*
* Returned Value:
* None
*
* Assumptions:
* This function must be called with the network locked.
*
****************************************************************************/
static uint16_t icmpv6_poll_eventhandler(FAR struct net_driver_s *dev,
FAR void *pvconn,
FAR void *pvpriv, uint16_t flags)
{
FAR struct icmpv6_poll_s *info = (FAR struct icmpv6_poll_s *)pvpriv;
FAR struct icmpv6_conn_s *conn;
FAR struct socket *psock;
pollevent_t eventset;
ninfo("flags: %04x\n", flags);
DEBUGASSERT(info == NULL || info->fds != NULL);
/* 'priv' might be null in some race conditions (?). Only process the
* the event if this poll is from the same device that the request was
* sent out on.
*/
if (info != NULL)
{
/* Is this a response on the same device that we sent the request out
* on?
*/
psock = info->psock;
DEBUGASSERT(psock != NULL && psock->s_conn != NULL);
conn = psock->s_conn;
if (dev != conn->dev)
{
ninfo("Wrong device\n");
return flags;
}
/* Check for data or connection availability events. */
eventset = 0;
if ((flags & ICMPv6_NEWDATA) != 0)
{
eventset |= (POLLIN & info->fds->events);
}
/* Check for loss of connection events. */
if ((flags & NETDEV_DOWN) != 0)
{
eventset |= (POLLHUP | POLLERR);
}
/* Awaken the caller of poll() is requested event occurred. */
if (eventset)
{
info->fds->revents |= eventset;
nxsem_post(info->fds->sem);
}
}
return flags;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: icmpv6_pollsetup
*
* Description:
* Setup to monitor events on one ICMP socket
*
* Input Parameters:
* psock - The IPPROTO_ICMP socket of interest
* fds - The structure describing the events to be monitored, OR NULL if
* this is a request to stop monitoring events.
*
* Returned Value:
* 0: Success; Negated errno on failure
*
****************************************************************************/
int icmpv6_pollsetup(FAR struct socket *psock, FAR struct pollfd *fds)
{
FAR struct icmpv6_conn_s *conn = psock->s_conn;
FAR struct icmpv6_poll_s *info;
FAR struct devif_callback_s *cb;
int ret = OK;
DEBUGASSERT(conn != NULL && fds != NULL);
/* Some of the following must be atomic */
net_lock();
/* Find a container to hold the poll information */
info = conn->pollinfo;
while (info->psock != NULL)
{
if (++info >= &conn->pollinfo[CONFIG_NET_ICMPv6_NPOLLWAITERS])
{
ret = -ENOMEM;
goto errout_with_lock;
}
}
/* Allocate a ICMP callback structure */
cb = icmpv6_callback_alloc(conn->dev, conn);
if (cb == NULL)
{
ret = -EBUSY;
goto errout_with_lock;
}
/* Initialize the poll info container */
info->psock = psock;
info->fds = fds;
info->cb = cb;
/* Initialize the callback structure. Save the reference to the info
* structure as callback private data so that it will be available during
* callback processing.
*/
cb->flags = NETDEV_DOWN;
cb->priv = (FAR void *)info;
cb->event = icmpv6_poll_eventhandler;
if ((fds->events & POLLIN) != 0)
{
cb->flags |= ICMPv6_NEWDATA;
}
/* Save the reference in the poll info structure as fds private as well
* for use during poll teardown as well.
*/
fds->priv = (FAR void *)info;
/* Check for read data availability now */
if (!IOB_QEMPTY(&conn->readahead))
{
/* Normal data may be read without blocking. */
fds->revents |= (POLLRDNORM & fds->events);
}
/* Always report POLLWRNORM if caller request it because we don't utilize
* IOB buffer for sending.
*/
fds->revents |= (POLLWRNORM & fds->events);
/* Check if any requested events are already in effect */
if (fds->revents != 0)
{
/* Yes.. then signal the poll logic */
nxsem_post(fds->sem);
}
errout_with_lock:
net_unlock();
return ret;
}
/****************************************************************************
* Name: icmpv6_pollteardown
*
* Description:
* Teardown monitoring of events on an ICMP socket
*
* Input Parameters:
* psock - The IPPROTO_ICMP socket of interest
* fds - The structure describing the events to be monitored, OR NULL if
* this is a request to stop monitoring events.
*
* Returned Value:
* 0: Success; Negated errno on failure
*
****************************************************************************/
int icmpv6_pollteardown(FAR struct socket *psock, FAR struct pollfd *fds)
{
FAR struct icmpv6_conn_s *conn;
FAR struct icmpv6_poll_s *info;
DEBUGASSERT(psock != NULL && psock->s_conn != NULL &&
fds != NULL && fds->priv != NULL);
conn = psock->s_conn;
/* Recover the socket descriptor poll state info from the poll structure */
info = (FAR struct icmpv6_poll_s *)fds->priv;
DEBUGASSERT(info != NULL && info->fds != NULL && info->cb != NULL);
if (info != NULL)
{
/* Release the callback */
icmpv6_callback_free(conn->dev, conn, info->cb);
/* Release the poll/select data slot */
info->fds->priv = NULL;
/* Then free the poll info container */
info->psock = NULL;
}
return OK;
}