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px4-firmware/nuttx/net/socket.c

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/****************************************************************************
* net/socket.c
*
* Copyright (C) 2007-2009, 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#ifdef CONFIG_NET
#include <sys/socket.h>
#include <errno.h>
#include <assert.h>
#include <debug.h>
#include "net_internal.h"
/****************************************************************************
* Global Functions
****************************************************************************/
/****************************************************************************
* Function: psock_socket
*
* Description:
* socket() creates an endpoint for communication and returns a socket
* structure.
*
* Parameters:
* domain (see sys/socket.h)
* type (see sys/socket.h)
* protocol (see sys/socket.h)
* psock A pointer to a user allocated socket structure to be initialized.
*
* Returned Value:
* 0 on success; -1 on error with errno set appropriately
*
* EACCES
* Permission to create a socket of the specified type and/or protocol
* is denied.
* EAFNOSUPPORT
* The implementation does not support the specified address family.
* EINVAL
* Unknown protocol, or protocol family not available.
* EMFILE
* Process file table overflow.
* ENFILE
* The system limit on the total number of open files has been reached.
* ENOBUFS or ENOMEM
* Insufficient memory is available. The socket cannot be created until
* sufficient resources are freed.
* EPROTONOSUPPORT
* The protocol type or the specified protocol is not supported within
* this domain.
*
* Assumptions:
*
****************************************************************************/
int psock_socket(int domain, int type, int protocol, FAR struct socket *psock)
{
int err = ENFILE;
/* Only PF_INET or PF_INET6 domains supported */
#ifdef CONFIG_NET_IPv6
if ( domain != PF_INET6)
#else
if ( domain != PF_INET)
#endif
{
err = EAFNOSUPPORT;
goto errout;
}
/* Only SOCK_STREAM and possible SOCK_DRAM are supported */
#if defined(CONFIG_NET_TCP) && defined(CONFIG_NET_UDP)
if ((type == SOCK_STREAM && protocol != 0 && protocol != IPPROTO_TCP) ||
(type == SOCK_DGRAM && protocol != 0 && protocol != IPPROTO_UDP) ||
(type != SOCK_STREAM && type != SOCK_DGRAM))
#elif defined(CONFIG_NET_TCP)
if ((type == SOCK_STREAM && protocol != 0 && protocol != IPPROTO_TCP) ||
(type != SOCK_STREAM))
#elif defined(CONFIG_NET_UDP)
if ((type == SOCK_DGRAM && protocol != 0 && protocol != IPPROTO_UDP) ||
(type != SOCK_DGRAM))
#endif
{
err = EPROTONOSUPPORT;
goto errout;
}
/* Everything looks good. Initialize the socket structure */
/* Save the protocol type */
psock->s_type = type;
psock->s_conn = NULL;
/* Allocate the appropriate connection structure. This reserves the
* the connection structure is is unallocated at this point. It will
* not actually be initialized until the socket is connected.
*/
err = ENOMEM; /* Assume failure to allocate connection instance */
switch (type)
{
#ifdef CONFIG_NET_TCP
case SOCK_STREAM:
{
/* Allocate the TCP connection structure and save in the new
* socket instance.
*/
struct uip_conn *conn = uip_tcpalloc();
if (conn)
{
/* Set the reference count on the connection structure. This
* reference count will be increment only if the socket is
* dup'ed
*/
DEBUGASSERT(conn->crefs == 0);
psock->s_conn = conn;
conn->crefs = 1;
}
}
break;
#endif
#ifdef CONFIG_NET_UDP
case SOCK_DGRAM:
{
/* Allocate the UDP connection structure and save in the new
* socket instance.
*/
struct uip_udp_conn *conn = uip_udpalloc();
if (conn)
{
/* Set the reference count on the connection structure. This
* reference count will be increment only if the socket is
* dup'ed
*/
DEBUGASSERT(conn->crefs == 0);
psock->s_conn = conn;
conn->crefs = 1;
}
}
break;
#endif
default:
break;
}
/* Did we succesfully allocate some kind of connection structure? */
if (!psock->s_conn)
{
/* Failed to reserve a connection structure */
goto errout; /* With err == ENFILE or ENOMEM */
}
return OK;
errout:
errno = err;
return ERROR;
}
/****************************************************************************
* Function: socket
*
* Description:
* socket() creates an endpoint for communication and returns a descriptor.
*
* Parameters:
* domain (see sys/socket.h)
* type (see sys/socket.h)
* protocol (see sys/socket.h)
*
* Returned Value:
* A non-negative socket descriptor on success; -1 on error with errno set
* appropriately.
*
* EACCES
* Permission to create a socket of the specified type and/or protocol
* is denied.
* EAFNOSUPPORT
* The implementation does not support the specified address family.
* EINVAL
* Unknown protocol, or protocol family not available.
* EMFILE
* Process file table overflow.
* ENFILE
* The system limit on the total number of open files has been reached.
* ENOBUFS or ENOMEM
* Insufficient memory is available. The socket cannot be created until
* sufficient resources are freed.
* EPROTONOSUPPORT
* The protocol type or the specified protocol is not supported within
* this domain.
*
* Assumptions:
*
****************************************************************************/
int socket(int domain, int type, int protocol)
{
FAR struct socket *psock;
int sockfd;
int ret;
/* Allocate a socket descriptor */
sockfd = sockfd_allocate(0);
if (sockfd < 0)
{
set_errno(ENFILE);
return ERROR;
}
/* Get the underlying socket structure */
psock = sockfd_socket(sockfd);
if (!psock)
{
set_errno(ENOSYS); /* should not happen */
goto errout;
}
/* Initialize the socket structure */
ret = psock_socket(domain, type, protocol, psock);
if (ret < 0)
{
/* Error already set by psock_socket() */
goto errout;
}
return sockfd;
errout:
sockfd_release(sockfd);
return ERROR;
}
#endif /* CONFIG_NET */
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