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nuttx/net/socket/net_close.c

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/****************************************************************************
* net/socket/net_close.c
*
* Copyright (C) 2007-2014 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>
#ifdef CONFIG_NET
#include <sys/types.h>
#include <sys/socket.h>
#include <stdint.h>
#include <stdbool.h>
#include <errno.h>
#include <debug.h>
#include <arch/irq.h>
#include <nuttx/net/netdev.h>
#include <nuttx/net/tcp.h>
#include <nuttx/net/udp.h>
#include <nuttx/net/pkt.h>
#ifdef CONFIG_NET_SOLINGER
# include <nuttx/clock.h>
#endif
#include "socket/socket.h"
#include "netdev/netdev.h"
#include "devif/devif.h"
#include "pkt/pkt.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
#ifdef CONFIG_NET_TCP
struct tcp_close_s
{
FAR struct uip_callback_s *cl_cb; /* Reference to TCP callback instance */
#ifdef CONFIG_NET_SOLINGER
FAR struct socket *cl_psock; /* Reference to the TCP socket */
sem_t cl_sem; /* Signals disconnect completion */
int cl_result; /* The result of the close */
#ifndef CONFIG_DISABLE_CLOCK
uint32_t cl_start; /* Time close started (in ticks) */
#endif
#endif
};
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Function: close_timeout
*
* Description:
* Check for a timeout on a lingering close.
*
* Parameters:
* pstate - close state structure
*
* Returned Value:
* TRUE:timeout FALSE:no timeout
*
* Assumptions:
* Running at the interrupt level
*
****************************************************************************/
#if defined(CONFIG_NET_TCP) && defined(CONFIG_NET_SOLINGER) && \
!defined(CONFIG_DISABLE_CLOCK)
static inline int close_timeout(FAR struct tcp_close_s *pstate)
{
FAR struct socket *psock = 0;
/* Make sure that we are performing a lingering close */
if (pstate)
{
/* Yes Check for a timeout configured via setsockopts(SO_LINGER).
* If none... we well let the send wait forever.
*/
psock = pstate->cl_psock;
if (psock && psock->s_linger != 0)
{
/* Check if the configured timeout has elapsed */
return net_timeo(pstate->cl_start, psock->s_linger);
}
}
/* No timeout */
return FALSE;
}
#endif /* CONFIG_NET_SOCKOPTS && CONFIG_NET_SOLINGER && !CONFIG_DISABLE_CLOCK */
/****************************************************************************
* Function: netclose_interrupt
*
* Description:
* Handle uIP callback events.
*
* Parameters:
* conn - uIP TCP connection structure
*
* Returned Value:
* None
*
* Assumptions:
* Called from normal user-level logic
*
****************************************************************************/
#ifdef CONFIG_NET_TCP
static uint16_t netclose_interrupt(FAR struct net_driver_s *dev,
FAR void *pvconn, FAR void *pvpriv,
uint16_t flags)
{
#ifdef CONFIG_NET_SOLINGER
FAR struct tcp_close_s *pstate = (FAR struct tcp_close_s *)pvpriv;
#endif
FAR struct tcp_conn_s *conn = (FAR struct tcp_conn_s *)pvconn;
DEBUGASSERT(conn != NULL);
nllvdbg("conn: %p flags: %04x\n", conn, flags);
/* UIP_CLOSE: The remote host has closed the connection
* UIP_ABORT: The remote host has aborted the connection
* UIP_TIMEDOUT: The remote did not respond, the connection timed out
*/
if ((flags & (UIP_CLOSE | UIP_ABORT | UIP_TIMEDOUT)) != 0)
{
/* The disconnection is complete */
#ifdef CONFIG_NET_SOLINGER
/* pstate non-NULL means that we are performing a LINGERing close.*/
if (pstate)
{
/* Wake up the waiting thread with a successful result */
pstate->cl_result = OK;
goto end_wait;
}
/* Otherwise, nothing is waiting on the close event and we can perform
* the completion actions here.
*/
else
#endif
{
/* Free connection resources */
tcp_free(conn);
/* Stop further callbacks */
flags = 0;
}
}
#if defined(CONFIG_NET_SOLINGER) && !defined(CONFIG_DISABLE_CLOCK)
/* Check for a timeout. */
else if (pstate && close_timeout(pstate))
{
/* Yes.. Wake up the waiting thread and report the timeout */
nlldbg("CLOSE timeout\n");
pstate->cl_result = -ETIMEDOUT;
goto end_wait;
}
#endif /* CONFIG_NET_SOLINGER && !CONFIG_DISABLE_CLOCK */
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
/* Check if all outstanding bytes have been ACKed */
else if (conn->unacked != 0)
{
/* No... we are still waiting for ACKs. Drop any received data, but
* do not yet report UIP_CLOSE in the response.
*/
dev->d_len = 0;
flags = (flags & ~UIP_NEWDATA);
}
#endif /* CONFIG_NET_TCP_WRITE_BUFFERS */
else
{
/* Drop data received in this state and make sure that UIP_CLOSE
* is set in the response
*/
dev->d_len = 0;
flags = (flags & ~UIP_NEWDATA) | UIP_CLOSE;
}
return flags;
#ifdef CONFIG_NET_SOLINGER
end_wait:
pstate->cl_cb->flags = 0;
pstate->cl_cb->priv = NULL;
pstate->cl_cb->event = NULL;
sem_post(&pstate->cl_sem);
nllvdbg("Resuming\n");
return 0;
#endif
}
#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 int netclose_disconnect(FAR struct socket *psock)
{
struct tcp_close_s state;
FAR struct tcp_conn_s *conn;
net_lock_t flags;
#ifdef CONFIG_NET_SOLINGER
bool linger;
#endif
int ret = OK;
/* Interrupts are disabled here to avoid race conditions */
flags = net_lock();
conn = (FAR struct tcp_conn_s *)psock->s_conn;
/* If we have a semi-permanent write buffer callback in place, then
* release it now.
*/
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
if (psock->s_sndcb)
{
tcp_callbackfree(conn, psock->s_sndcb);
psock->s_sndcb = NULL;
}
#endif
/* There shouldn't be any callbacks registered. */
DEBUGASSERT(conn && conn->list == NULL);
/* Check for the case where the host beat us and disconnected first */
if (conn->tcpstateflags == UIP_ESTABLISHED &&
(state.cl_cb = tcp_callbackalloc(conn)) != NULL)
{
/* Set up to receive TCP data event callbacks */
state.cl_cb->flags = (UIP_NEWDATA | UIP_POLL | UIP_CLOSE | UIP_ABORT | \
UIP_TIMEDOUT);
state.cl_cb->event = netclose_interrupt;
#ifdef CONFIG_NET_SOLINGER
/* Check for a lingering close */
linger = _SO_GETOPT(psock->s_options, SO_LINGER);
/* Has a lingering close been requested */
if (linger)
{
/* A non-NULL value of the priv field means that lingering is
* enabled.
*/
state.cl_cb->priv = (FAR void *)&state;
/* Set up for the lingering wait */
state.cl_psock = psock;
state.cl_result = -EBUSY;
sem_init(&state.cl_sem, 0, 0);
#ifndef CONFIG_DISABLE_CLOCK
/* Record the time that we started the wait (in ticks) */
state.cl_start = clock_systimer();
#endif
}
else
#endif /* CONFIG_NET_SOLINGER */
{
/* We will close immediately. The NULL priv field signals this */
state.cl_cb->priv = NULL;
/* No further references on the connection */
conn->crefs = 0;
}
/* Notify the device driver of the availability of TX data */
netdev_txnotify(conn->ripaddr);
#ifdef CONFIG_NET_SOLINGER
/* Wait only if we are lingering */
if (linger)
{
/* Wait for the disconnect event */
(void)net_lockedwait(&state.cl_sem);
/* We are now disconnected */
sem_destroy(&state.cl_sem);
tcp_callbackfree(conn, state.cl_cb);
/* Free the connection */
conn->crefs = 0; /* No more references on the connection */
tcp_free(conn); /* Free uIP resources */
/* Get the result of the close */
ret = state.cl_result;
}
#endif /* CONFIG_NET_SOLINGER */
}
else
{
tcp_free(conn);
}
net_unlock(flags);
return ret;
}
#endif /* CONFIG_NET_TCP */
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: psock_close
*
* Description:
* Performs the close operation on a socket instance
*
* Parameters:
* psock Socket instance
*
* Returned Value:
* 0 on success; -1 on error with errno set appropriately.
*
* Assumptions:
*
****************************************************************************/
int psock_close(FAR struct socket *psock)
{
int err;
/* Verify that the sockfd corresponds to valid, allocated socket */
if (!psock || psock->s_crefs <= 0)
{
err = EBADF;
goto errout;
}
/* We perform the uIP close operation only if this is the last count on the socket.
* (actually, I think the socket crefs only takes the values 0 and 1 right now).
*/
if (psock->s_crefs <= 1)
{
/* Perform uIP side of the close depending on the protocol type */
switch (psock->s_type)
{
#ifdef CONFIG_NET_PKT
case SOCK_RAW:
{
FAR struct pkt_conn_s *conn = psock->s_conn;
/* Is this the last reference to the connection structure (there
* could be more if the socket was dup'ed).
*/
if (conn->crefs <= 1)
{
/* Yes... free the connection structure */
conn->crefs = 0; /* No more references on the connection */
pkt_free(psock->s_conn); /* Free uIP resources */
}
else
{
/* No.. Just decrement the reference count */
conn->crefs--;
}
}
break;
#endif
#ifdef CONFIG_NET_TCP
case SOCK_STREAM:
{
FAR struct tcp_conn_s *conn = psock->s_conn;
/* Is this the last reference to the connection structure (there
* could be more if the socket was dup'ed).
*/
if (conn->crefs <= 1)
{
/* Yes... then perform the disconnection now */
tcp_unlisten(conn); /* No longer accepting connections */
conn->crefs = 0; /* Discard our reference to the connection */
err = netclose_disconnect(psock); /* Break any current connections */
if (err < 0)
{
/* This would normally occur only if there is a timeout
* from a lingering close.
*/
goto errout_with_psock;
}
}
else
{
/* No.. Just decrement the reference count */
conn->crefs--;
}
}
break;
#endif
#ifdef CONFIG_NET_UDP
case SOCK_DGRAM:
{
FAR struct udp_conn_s *conn = psock->s_conn;
/* Is this the last reference to the connection structure (there
* could be more if the socket was dup'ed).
*/
if (conn->crefs <= 1)
{
/* Yes... free the connection structure */
conn->crefs = 0; /* No more references on the connection */
udp_free(psock->s_conn); /* Free uIP resources */
}
else
{
/* No.. Just decrement the reference count */
conn->crefs--;
}
}
break;
#endif
default:
err = EBADF;
goto errout;
}
}
/* Then release our reference on the socket structure containing the connection */
sock_release(psock);
return OK;
#ifdef CONFIG_NET_TCP
errout_with_psock:
sock_release(psock);
#endif
errout:
set_errno(err);
return ERROR;
}
/****************************************************************************
* 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)
{
return psock_close(sockfd_socket(sockfd));
}
#endif /* CONFIG_NET */
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