nuttx/net/usrsock/usrsock_sockif.c

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/****************************************************************************
* net/usrsock/usrsock_sockif.c
*
* Copyright (C) 2017 Haltian Ltd. All rights reserved.
* Author: Jussi Kivilinna <jussi.kivilinna@haltian.com>
*
* 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>
#if defined(CONFIG_NET) && defined(CONFIG_NET_USRSOCK)
#include <sys/types.h>
#include <sys/socket.h>
#include <stdbool.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/net/net.h>
#include "usrsock/usrsock.h"
#include "socket/socket.h"
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int usrsock_sockif_setup(FAR struct socket *psock, int protocol);
static sockcaps_t usrsock_sockif_sockcaps(FAR struct socket *psock);
static void usrsock_sockif_addref(FAR struct socket *psock);
static ssize_t usrsock_sockif_send(FAR struct socket *psock,
FAR const void *buf, size_t len,
int flags);
static int usrsock_sockif_close(FAR struct socket *psock);
/****************************************************************************
* Public Data
****************************************************************************/
const struct sock_intf_s g_usrsock_sockif =
{
usrsock_sockif_setup, /* si_setup */
usrsock_sockif_sockcaps, /* si_sockcaps */
usrsock_sockif_addref, /* si_addref */
usrsock_bind, /* si_bind */
usrsock_getsockname, /* si_getsockname */
usrsock_getpeername, /* si_getpeername */
usrsock_listen, /* si_listen */
usrsock_connect, /* si_connect */
usrsock_accept, /* si_accept */
#ifndef CONFIG_DISABLE_POLL
usrsock_poll, /* si_poll */
#endif
usrsock_sockif_send, /* si_send */
usrsock_sendto, /* si_sendto */
#ifdef CONFIG_NET_SENDFILE
NULL, /* si_sendfile */
#endif
usrsock_recvfrom, /* si_recvfrom */
usrsock_sockif_close, /* si_close */
usrsock_ioctl /* si_ioctl */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: inet_setup
*
* Description:
* Called for socket() to verify that the provided socket type and
* protocol are usable by this address family. Perform any family-
* specific socket fields.
*
* Input Parameters:
* psock A pointer to a user allocated socket structure to be initialized.
* protocol (see sys/socket.h)
*
* Returned Value:
* Zero (OK) is returned on success. Otherwise, a negater errno value is
* returned.
*
****************************************************************************/
static int usrsock_sockif_setup(FAR struct socket *psock, int protocol)
{
int domain = psock->s_domain;
int type = psock->s_type;
int ret;
#ifdef CONFIG_NET_USRSOCK_NO_INET
if (domain == PF_INET)
{
return -ENETDOWN;
}
#endif
#ifdef CONFIG_NET_USRSOCK_NO_INET6
if (domain == PF_INET6)
{
return -ENETDOWN;
}
#endif
if (domain == PF_INET || domain == PF_INET6)
{
#ifndef CONFIG_NET_USRSOCK_UDP
if (type == SOCK_DGRAM)
{
return -ENETDOWN;
}
#endif
#ifndef CONFIG_NET_USRSOCK_TCP
if (type == SOCK_STREAM)
{
return -ENETDOWN;
}
#endif
}
else
{
#ifndef CONFIG_NET_USRSOCK_OTHER
return -ENETDOWN;
#endif
}
psock->s_type = PF_UNSPEC;
psock->s_conn = NULL;
/* Let the user socket logic handle the setup...
*
* A return value of zero means that the operation was
* successfully handled by usrsock. A negative value means that
* an error occurred. The special error value -ENETDOWN means
* that usrsock daemon is not running. The caller should attempt
* to open socket with kernel networking stack in this case.
*/
ret = usrsock_socket(domain, type, protocol, psock);
if (ret == -ENETDOWN)
{
nwarn("WARNING: usrsock daemon is not running\n");
}
return ret;
}
/****************************************************************************
* Name: usrsock_sockif_sockcaps
*
* Description:
* Return the bit encoded capabilities of this socket.
*
* Input Parameters:
* psock - Socket structure of the socket whose capabilities are being
* queried.
*
* Returned Value:
* The non-negative set of socket cababilities is returned.
*
****************************************************************************/
static sockcaps_t usrsock_sockif_sockcaps(FAR struct socket *psock)
{
return SOCKCAP_NONBLOCKING;
}
/****************************************************************************
* Name: usrsock_sockif_addref
*
* Description:
* Increment the reference count on the underlying connection structure.
*
* Input Parameters:
* psock - Socket structure of the socket whose reference count will be
* incremented.
*
* Returned Value:
* None
*
****************************************************************************/
static void usrsock_sockif_addref(FAR struct socket *psock)
{
FAR struct usrsock_conn_s *conn;
DEBUGASSERT(psock != NULL && psock->s_conn != NULL);
conn = psock->s_conn;
DEBUGASSERT(conn->crefs > 0 && conn->crefs < 255);
conn->crefs++;
}
/****************************************************************************
* Name: usrsock_sockif_send
*
* Description:
* The usrsock_sockif_send() call may be used only when the socket is in
* a connected state (so that the intended recipient is known).
*
* Input Parameters:
* psock An instance of the internal socket structure.
* buf Data to send
* len Length of data to send
* flags Send flags (ignored)
*
* Returned Value:
* On success, returns the number of characters sent. On error, a negated
* errno value is returned (see send() for the list of appropriate error
* values.
*
****************************************************************************/
static ssize_t usrsock_sockif_send(FAR struct socket *psock,
FAR const void *buf,
size_t len, int flags)
{
return usrsock_sendto(psock, buf, len, flags, NULL, 0);
}
/****************************************************************************
* Name: usrsock_sockif_close
*
* Description:
* Performs the close operation on an USRSOCK socket instance
*
* Input Parameters:
* psock Socket instance
*
* Returned Value:
* 0 on success; -1 on error with errno set appropriately.
*
* Assumptions:
*
****************************************************************************/
static int usrsock_sockif_close(FAR struct socket *psock)
{
FAR struct usrsock_conn_s *conn = psock->s_conn;
int ret;
/* Perform some pre-close operations for the USRSOCK socket type. */
/* Is this the last reference to the connection structure (there
* could be more if the socket was dup'ed).
*/
if (conn->crefs <= 1)
{
/* Yes... inform user-space daemon of socket close. */
ret = usrsock_close(conn);
/* Free the connection structure */
conn->crefs = 0;
usrsock_free(psock->s_conn);
if (ret < 0)
{
/* Return with error code, but free resources. */
nerr("ERROR: usrsock_close failed: %d\n", ret);
return ret;
}
}
else
{
/* No.. Just decrement the reference count */
conn->crefs--;
}
return OK;
}
#endif /* CONFIG_NET && CONFIG_NET_USRSOCK */