83cdb0c552
libc/semaphore: Add nxsem_getvalue() which is identical to sem_getvalue() except that it never modifies the errno variable. Changed all references to sem_getvalue in the OS to nxsem_getvalue().
sched/semaphore: Rename all internal private functions from sem_xyz to nxsem_xyz. The sem_ prefix is (will be) reserved only for the application semaphore interfaces.
libc/semaphore: Add nxsem_init() which is identical to sem_init() except that it never modifies the errno variable. Changed all references to sem_init in the OS to nxsem_init().
sched/semaphore: Rename sem_tickwait() to nxsem_tickwait() so that it is clear this is an internal OS function.
sched/semaphoate: Rename sem_reset() to nxsem_reset() so that it is clear this is an internal OS function.
418 lines
13 KiB
C
418 lines
13 KiB
C
/****************************************************************************
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* net/tcp/tcp_connect.c
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*
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* Copyright (C) 2007-2012, 2015-2017 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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#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 <assert.h>
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#include <debug.h>
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#include <arch/irq.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/udp.h>
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#include <nuttx/net/tcp.h>
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#include "devif/devif.h"
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#include "socket/socket.h"
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#include "tcp/tcp.h"
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#ifdef NET_TCP_HAVE_STACK
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct tcp_connect_s
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{
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FAR struct tcp_conn_s *tc_conn; /* Reference to TCP connection structure */
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FAR struct devif_callback_s *tc_cb; /* Reference to callback instance */
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FAR struct socket *tc_psock; /* The socket being connected */
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sem_t tc_sem; /* Semaphore signals recv completion */
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int tc_result; /* OK on success, otherwise a negated errno. */
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static inline int psock_setup_callbacks(FAR struct socket *psock,
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FAR struct tcp_connect_s *pstate);
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static void psock_teardown_callbacks(FAR struct tcp_connect_s *pstate,
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int status);
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static uint16_t psock_connect_eventhandler(FAR struct net_driver_s *dev,
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FAR void *pvconn,
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FAR void *pvpriv, uint16_t flags);
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: psock_setup_callbacks
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****************************************************************************/
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static inline int psock_setup_callbacks(FAR struct socket *psock,
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FAR struct tcp_connect_s *pstate)
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{
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FAR struct tcp_conn_s *conn = psock->s_conn;
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int ret = -EBUSY;
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/* Initialize the TCP state structure */
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/* This semaphore is used for signaling and, hence, should not have
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* priority inheritance enabled.
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*/
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(void)nxsem_init(&pstate->tc_sem, 0, 0); /* Doesn't really fail */
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(void)sem_setprotocol(&pstate->tc_sem, SEM_PRIO_NONE);
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pstate->tc_conn = conn;
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pstate->tc_psock = psock;
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pstate->tc_result = -EAGAIN;
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/* Set up the callbacks in the connection */
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pstate->tc_cb = tcp_callback_alloc(conn);
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if (pstate->tc_cb)
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{
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/* Set up the connection event handler */
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pstate->tc_cb->flags = (TCP_NEWDATA | TCP_CLOSE | TCP_ABORT |
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TCP_TIMEDOUT | TCP_CONNECTED | NETDEV_DOWN);
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pstate->tc_cb->priv = (FAR void *)pstate;
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pstate->tc_cb->event = psock_connect_eventhandler;
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ret = OK;
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}
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return ret;
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}
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/****************************************************************************
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* Name: psock_teardown_callbacks
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****************************************************************************/
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static void psock_teardown_callbacks(FAR struct tcp_connect_s *pstate,
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int status)
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{
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FAR struct tcp_conn_s *conn = pstate->tc_conn;
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/* Make sure that no further events are processed */
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tcp_callback_free(conn, pstate->tc_cb);
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pstate->tc_cb = NULL;
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/* If we successfully connected, we will continue to monitor the connection
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* state via callbacks.
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*/
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if (status < 0)
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{
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/* Failed to connect. Stop the connection event monitor */
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tcp_stop_monitor(conn, TCP_CLOSE);
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}
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}
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/****************************************************************************
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* Name: psock_connect_eventhandler
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*
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* Description:
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* This function is called to perform the actual connection operation via
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* by the lower, device interfacing layer.
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*
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* Parameters:
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* dev The structure of the network driver that reported the event
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* pvconn The connection structure associated with the socket
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* flags Set of events describing why the callback was invoked
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*
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* Returned Value:
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* The new flags setting
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*
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* Assumptions:
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* The network is locked.
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*
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****************************************************************************/
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static uint16_t psock_connect_eventhandler(FAR struct net_driver_s *dev,
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FAR void *pvconn,
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FAR void *pvpriv, uint16_t flags)
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{
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struct tcp_connect_s *pstate = (struct tcp_connect_s *)pvpriv;
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ninfo("flags: %04x\n", flags);
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/* 'priv' might be null in some race conditions (?) */
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if (pstate)
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{
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/* The following errors should be detected here (someday)
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*
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* ECONNREFUSED
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* No one listening on the remote address.
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* ENETUNREACH
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* Network is unreachable.
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* ETIMEDOUT
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* Timeout while attempting connection. The server may be too busy
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* to accept new connections.
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*/
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/* TCP_CLOSE: The remote host has closed the connection
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* TCP_ABORT: The remote host has aborted the connection
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*/
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if ((flags & (TCP_CLOSE | TCP_ABORT)) != 0)
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{
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/* Indicate that remote host refused the connection */
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pstate->tc_result = -ECONNREFUSED;
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}
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/* TCP_TIMEDOUT: Connection aborted due to too many retransmissions. */
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else if ((flags & TCP_TIMEDOUT) != 0)
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{
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/* Indicate that the connection timedout?) */
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pstate->tc_result = -ETIMEDOUT;
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}
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else if ((flags & NETDEV_DOWN) != 0)
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{
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/* The network device went down. Indicate that the remote host
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* is unreachable.
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*/
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pstate->tc_result = -ENETUNREACH;
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}
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/* TCP_CONNECTED: The socket is successfully connected */
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else if ((flags & TCP_CONNECTED) != 0)
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{
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FAR struct socket *psock = pstate->tc_psock;
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DEBUGASSERT(psock);
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/* Mark the connection bound and connected. NOTE this is
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* is done here (vs. later) in order to avoid any race condition
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* in the socket state. It is known to connected here and now,
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* but not necessarily at any time later.
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*/
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psock->s_flags |= (_SF_BOUND | _SF_CONNECTED);
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/* Indicate that the socket is no longer connected */
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pstate->tc_result = OK;
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}
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/* Otherwise, it is not an event of importance to us at the moment */
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else
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{
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/* Drop data received in this state */
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dev->d_len = 0;
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return flags & ~TCP_NEWDATA;
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}
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ninfo("Resuming: %d\n", pstate->tc_result);
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/* Stop further callbacks */
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psock_teardown_callbacks(pstate, pstate->tc_result);
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/* When we set up the connection structure, we did not know the size
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* of the initial MSS. Now that the connection is associated with a
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* network device, we now know the size of link layer header and can
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* determine the correct initial MSS.
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*/
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DEBUGASSERT(pstate->tc_conn);
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#ifdef CONFIG_NET_IPv4
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#ifdef CONFIG_NET_IPv6
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if (pstate->tc_conn->domain == PF_INET)
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#endif
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{
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pstate->tc_conn->mss = TCP_IPv4_INITIAL_MSS(dev);
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}
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#endif /* CONFIG_NET_IPv4 */
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#ifdef CONFIG_NET_IPv6
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#ifdef CONFIG_NET_IPv4
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else
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#endif
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{
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pstate->tc_conn->mss = TCP_IPv6_INITIAL_MSS(dev);
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}
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#endif /* CONFIG_NET_IPv6 */
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/* We now have to filter all outgoing transfers so that they use only
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* the MSS of this device.
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*/
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DEBUGASSERT(pstate->tc_conn->dev == NULL ||
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pstate->tc_conn->dev == dev);
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pstate->tc_conn->dev = dev;
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/* Wake up the waiting thread */
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sem_post(&pstate->tc_sem);
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}
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return flags;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: psock_tcp_connect
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*
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* Description:
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* Perform a TCP connection
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*
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* Parameters:
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* psock - A reference to the socket structure of the socket to be connected
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* addr - The address of the remote server to connect to
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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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* The network is locked
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*
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****************************************************************************/
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int psock_tcp_connect(FAR struct socket *psock,
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FAR const struct sockaddr *addr)
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{
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struct tcp_connect_s state;
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int ret = OK;
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/* Interrupts must be disabled through all of the following because
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* we cannot allow the network callback to occur until we are completely
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* setup.
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*/
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net_lock();
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/* Get the connection reference from the socket */
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if (!psock->s_conn) /* Should always be non-NULL */
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{
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ret = -EINVAL;
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}
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else
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{
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/* Perform the TCP connection operation */
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ret = tcp_connect(psock->s_conn, addr);
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}
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if (ret >= 0)
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{
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/* Set up the callbacks in the connection */
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ret = psock_setup_callbacks(psock, &state);
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if (ret >= 0)
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{
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/* Wait for either the connect to complete or for an error/timeout
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* to occur. NOTES: net_lockedwait will also terminate if a signal
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* is received.
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*/
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ret = net_lockedwait(&state.tc_sem);
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/* Uninitialize the state structure */
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(void)sem_destroy(&state.tc_sem);
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/* If net_lockedwait failed, negated errno was returned. */
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if (ret >= 0)
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{
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/* If the wait succeeded, then get the new error value from
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* the state structure
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*/
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ret = state.tc_result;
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}
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/* Make sure that no further events are processed */
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psock_teardown_callbacks(&state, ret);
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}
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/* Check if the socket was successfully connected. */
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if (ret >= 0)
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{
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/* Yes... Now that we are connected, we need to set up to monitor
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* the state of the connection up the connection event monitor.
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*/
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ret = tcp_start_monitor(psock);
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if (ret < 0)
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{
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/* tcp_start_monitor() can only fail on certain race
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* conditions where the connection was lost just before
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* this function was called. That is not expected to
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* happen in this context, but just in case...
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*/
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tcp_stop_monitor(psock->s_conn, TCP_ABORT);
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}
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}
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}
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net_unlock();
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return ret;
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}
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#endif /* NET_TCP_HAVE_STACK */
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