335 lines
9.1 KiB
C
335 lines
9.1 KiB
C
/****************************************************************************
|
|
* net/socket.c
|
|
*
|
|
* Copyright (C) 2007-2009, 2012, 2014 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.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;
|
|
|
|
/* Only PF_INET, PF_INET6 or PF_PACKET domains supported */
|
|
|
|
if (
|
|
#if defined(CONFIG_NET_IPv6)
|
|
domain != PF_INET6
|
|
#else
|
|
domain != PF_INET
|
|
#endif
|
|
#if defined(CONFIG_NET_PKT)
|
|
&& domain != PF_PACKET
|
|
#endif
|
|
)
|
|
{
|
|
err = EAFNOSUPPORT;
|
|
goto errout;
|
|
}
|
|
|
|
/* Only SOCK_STREAM, SOCK_DGRAM and possible SOCK_RAW are supported */
|
|
|
|
if (
|
|
#if defined(CONFIG_NET_TCP)
|
|
(type == SOCK_STREAM && protocol != 0 && protocol != IPPROTO_TCP) ||
|
|
#endif
|
|
#if defined(CONFIG_NET_UDP)
|
|
(type == SOCK_DGRAM && protocol != 0 && protocol != IPPROTO_UDP) ||
|
|
#endif
|
|
(
|
|
#if defined(CONFIG_NET_TCP)
|
|
#if defined(CONFIG_NET_UDP) || defined(CONFIG_NET_PKT)
|
|
type != SOCK_STREAM &&
|
|
#else
|
|
type != SOCK_STREAM
|
|
#endif
|
|
#endif
|
|
#if defined(CONFIG_NET_UDP)
|
|
#if defined(CONFIG_NET_PKT)
|
|
type != SOCK_DGRAM &&
|
|
#else
|
|
type != SOCK_DGRAM
|
|
#endif
|
|
#endif
|
|
#if defined(CONFIG_NET_PKT)
|
|
type != SOCK_RAW
|
|
#endif
|
|
)
|
|
)
|
|
{
|
|
err = EPROTONOSUPPORT;
|
|
goto errout;
|
|
}
|
|
|
|
/* Everything looks good. Initialize the socket structure */
|
|
/* Save the protocol type */
|
|
|
|
psock->s_type = type;
|
|
psock->s_conn = NULL;
|
|
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
|
|
psock->s_sndcb = NULL;
|
|
#endif
|
|
|
|
/* 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_PKT
|
|
case SOCK_RAW:
|
|
{
|
|
/* Allocate the packet socket connection structure and save
|
|
* in the new socket instance.
|
|
*/
|
|
|
|
struct uip_pkt_conn *conn = uip_pktalloc();
|
|
if (!conn)
|
|
{
|
|
/* Failed to reserve a connection structure */
|
|
|
|
goto errout;
|
|
}
|
|
|
|
/* 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_TCP
|
|
case SOCK_STREAM:
|
|
{
|
|
/* Allocate the TCP connection structure and save in the new
|
|
* socket instance.
|
|
*/
|
|
|
|
FAR struct tcp_conn_s *conn = tcp_alloc();
|
|
if (!conn)
|
|
{
|
|
/* Failed to reserve a connection structure */
|
|
|
|
goto errout; /* With err == ENFILE or ENOMEM */
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
/* Failed to reserve a connection structure */
|
|
|
|
goto errout; /* With err == ENFILE or ENOMEM */
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
return OK;
|
|
|
|
errout:
|
|
set_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 */
|