/****************************************************************************
* net/net-close.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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>
#ifdef CONFIG_NET
#include <sys/types.h>
#include <sys/socket.h>
#include <errno.h>
#include <debug.h>
#include <arch/irq.h>
#include <net/uip/uip-arch.h>
#include "net-internal.h"
/****************************************************************************
* Private Types
****************************************************************************/
#ifdef CONFIG_NET_TCP
struct tcp_close_s
{
FAR struct socket *cl_psock; /* Reference to the TCP socket */
sem_t cl_sem; /* Semaphore signals disconnect completion */
};
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Function: netclose_disconnect
*
* Description:
* Break any current TCP connection
*
* Parameters:
* conn - uIP TCP connection structure
*
* Returned Value:
* None
*
* Assumptions:
* Called from normal user-level logic
*
****************************************************************************/
#ifdef CONFIG_NET_TCP
static uint8 netclose_interrupt(struct uip_driver_s *dev,
struct uip_conn *conn, uint8 flags)
{
struct tcp_close_s *pstate = (struct tcp_close_s *)conn->data_private;
nvdbg("flags: %02x\n", flags);
if (pstate)
{
/* UIP_CLOSE: The remote host has closed the connection
* UIP_ABORT: The remote host has aborted the connection
*/
if ((flags & (UIP_CLOSE|UIP_ABORT)) != 0)
{
/* The disconnection is complete */
conn->data_flags = 0;
conn->data_private = NULL;
conn->data_event = NULL;
sem_post(&pstate->cl_sem);
nvdbg("Resuming\n");
}
else
{
/* Drop data received in this state and make sure that UIP_CLOSE
* is set in the response
*/
dev->d_len = 0;
return (flags & ~UIP_NEWDATA) | UIP_CLOSE;
}
}
return flags;
}
#endif /* CONFIG_NET_TCP */
/****************************************************************************
* Function: netclose_disconnect
*
* Description:
* Break any current TCP connection
*
* Parameters:
* conn - uIP TCP connection structure
*
* Returned Value:
* None
*
* Assumptions:
* Called from normal user-level logic
*
****************************************************************************/
#ifdef CONFIG_NET_TCP
static inline void netclose_disconnect(FAR struct socket *psock)
{
struct tcp_close_s state;
struct uip_conn *conn;
irqstate_t flags;
/* Interrupts are disabled here to avoid race conditions */
flags = irqsave();
/* Is the TCP socket in a connected state? */
if (_SS_ISCONNECTED(psock->s_flags))
{
/* Set up to receive TCP data events */
state.cl_psock = psock;
sem_init(&state.cl_sem, 0, 0);
conn = psock->s_conn;
conn->data_flags = UIP_NEWDATA|UIP_CLOSE|UIP_ABORT;
conn->data_private = (void*)&state;
conn->data_event = netclose_interrupt;
/* Notify the device driver of the availaibilty of TX data */
netdev_txnotify(&conn->ripaddr);
/* Wait for the disconnect event */
(void)sem_wait(&state.cl_sem);
/* We are now disconnected */
sem_destroy(&state.cl_sem);
conn->data_flags = 0;
conn->data_private = NULL;
conn->data_event = NULL;
}
irqrestore(flags);
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: net_close
*
* Description:
* Performs the close operation on socket descriptors
*
* Parameters:
* sockfd Socket descriptor of socket
*
* Returned Value:
* 0 on success; -1 on error with errno set appropriately.
*
* Assumptions:
*
****************************************************************************/
int net_close(int sockfd)
{
FAR struct socket *psock = sockfd_socket(sockfd);
int err;
/* Verify that the sockfd corresponds to valid, allocated socket */
if (!psock || psock->s_crefs <= 0)
{
err = EBADF;
goto errout;
}
/* Perform uIP side of the close depending on the protocol type */
switch (psock->s_type)
{
#ifdef CONFIG_NET_TCP
case SOCK_STREAM:
{
struct uip_conn *conn = psock->s_conn;
uip_unlisten(conn); /* No longer accepting connections */
netclose_disconnect(psock); /* Break any current connections */
uip_tcpfree(conn); /* Free uIP resources */
}
break;
#endif
#ifdef CONFIG_NET_UDP
case SOCK_DGRAM:
uip_udpfree(psock->s_conn); /* Free uIP resources */
break;
#endif
default:
err = EBADF;
goto errout;
}
/* Then release the socket structure containing the connection */
sockfd_release(sockfd);
return OK;
errout:
*get_errno_ptr() = err;
return ERROR;
}
#endif /* CONFIG_NET */
