forked from Archive/PX4-Autopilot
331 lines
9.5 KiB
C
331 lines
9.5 KiB
C
/****************************************************************************
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* net/net_close.c
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*
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* Copyright (C) 2007-2012 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 <errno.h>
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#include <debug.h>
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#include <arch/irq.h>
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#include <nuttx/net/uip/uip-arch.h>
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#include "net_internal.h"
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#include "uip/uip_internal.h"
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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 socket *cl_psock; /* Reference to the TCP socket */
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FAR struct uip_callback_s *cl_cb; /* Reference to TCP callback instance */
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sem_t cl_sem; /* Semaphore signals disconnect completion */
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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: 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(struct uip_driver_s *dev, void *pvconn,
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void *pvpriv, uint16_t flags)
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{
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struct tcp_close_s *pstate = (struct tcp_close_s *)pvpriv;
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nllvdbg("flags: %04x\n", flags);
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if (pstate)
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{
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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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*/
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if ((flags & (UIP_CLOSE|UIP_ABORT)) != 0)
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{
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/* The disconnection is complete */
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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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}
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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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return (flags & ~UIP_NEWDATA) | UIP_CLOSE;
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}
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}
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return flags;
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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 void netclose_disconnect(FAR struct socket *psock)
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{
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struct tcp_close_s state;
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uip_lock_t flags;
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/* Interrupts are disabled here to avoid race conditions */
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flags = uip_lock();
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/* Is the TCP socket in a connected state? */
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if (_SS_ISCONNECTED(psock->s_flags))
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{
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struct uip_conn *conn = (struct uip_conn*)psock->s_conn;
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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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{
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/* Set up to receive TCP data event callbacks */
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state.cl_cb = uip_tcpcallbackalloc(conn);
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if (state.cl_cb)
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{
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state.cl_psock = psock;
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sem_init(&state.cl_sem, 0, 0);
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state.cl_cb->flags = UIP_NEWDATA|UIP_POLL|UIP_CLOSE|UIP_ABORT;
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state.cl_cb->priv = (void*)&state;
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state.cl_cb->event = netclose_interrupt;
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/* Notify the device driver of the availaibilty of TX data */
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netdev_txnotify(&conn->ripaddr);
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/* Wait for the disconnect event */
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(void)uip_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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uip_tcpcallbackfree(conn, state.cl_cb);
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}
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}
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}
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uip_unlock(flags);
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}
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#endif
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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_TCP
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case SOCK_STREAM:
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{
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struct uip_conn *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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uip_unlisten(conn); /* No longer accepting connections */
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netclose_disconnect(psock); /* Break any current connections */
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conn->crefs = 0; /* No more references on the connection */
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uip_tcpfree(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_UDP
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case SOCK_DGRAM:
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{
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struct uip_udp_conn *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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uip_udpfree(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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errout:
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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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