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