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incubator-nuttx/net/socket/setsockopt.c

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/****************************************************************************
* net/socket/setsockopt.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#if defined(CONFIG_NET) && defined(CONFIG_NET_SOCKOPTS)
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <errno.h>
#include <debug.h>
#include <assert.h>
#include <arch/irq.h>
#include <nuttx/net/net.h>
#include <nuttx/net/netdev.h>
#include <netdev/netdev.h>
#include "socket/socket.h"
#include "utils/utils.h"
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: psock_socketlevel_option
*
* Description:
* psock_socketlevel_option() sets the socket-level option specified by the
* 'option' argument to the value pointed to by the 'value' argument for
* the socket specified by the 'psock' argument.
*
* See <sys/socket.h> a complete list of values for the socket level
* 'option' argument.
*
* Input Parameters:
* psock Socket structure of socket to operate on
* option identifies the option to set
* value Points to the argument value
* value_len The length of the argument value
*
* Returned Value:
* Returns zero (OK) on success. On failure, it returns a negated errno
* value to indicate the nature of the error. See psock_setcockopt() for
* the list of possible error values.
*
****************************************************************************/
static int psock_socketlevel_option(FAR struct socket *psock, int option,
FAR const void *value,
socklen_t value_len)
{
FAR struct socket_conn_s *conn = psock->s_conn;
/* Process the options always handled locally */
switch (option)
{
/* The following options take a pointer to an integer boolean value.
* We will blindly set the bit here although the implementation
* is outside of the scope of setsockopt.
*/
case SO_RCVTIMEO:
case SO_SNDTIMEO:
{
FAR struct timeval *tv = (FAR struct timeval *)value;
socktimeo_t timeo;
/* Verify that option is the size of an 'struct timeval'. */
if (tv == NULL || value_len != sizeof(struct timeval))
{
return -EINVAL;
}
/* Get the timeout value. Any microsecond remainder will be
* forced to the next larger, whole decisecond value.
*/
timeo = (socktimeo_t)net_timeval2dsec(tv, TV2DS_CEIL);
/* Save the timeout value */
if (option == SO_RCVTIMEO)
{
conn->s_rcvtimeo = timeo;
}
else
{
conn->s_sndtimeo = timeo;
}
/* Set/clear the corresponding enable/disable bit */
if (timeo)
{
_SO_CLROPT(conn->s_options, option);
}
else
{
_SO_SETOPT(conn->s_options, option);
}
return OK;
}
case SO_BROADCAST: /* Permits sending of broadcast messages */
case SO_DEBUG: /* Enables recording of debugging information */
case SO_DONTROUTE: /* Requests outgoing messages bypass standard routing */
case SO_KEEPALIVE: /* Verifies TCP connections active by enabling the
* periodic transmission of probes */
case SO_OOBINLINE: /* Leaves received out-of-band data inline */
case SO_REUSEADDR: /* Allow reuse of local addresses */
{
int setting;
/* Verify that option is the size of an 'int'. Should also check
* that 'value' is properly aligned for an 'int'
*/
if (value_len != sizeof(int))
{
return -EINVAL;
}
/* Get the value. Is the option being set or cleared? */
setting = *(FAR int *)value;
/* Lock the network so that we have exclusive access to the socket
* options.
*/
net_lock();
/* Set or clear the option bit */
if (setting)
{
_SO_SETOPT(conn->s_options, option);
}
else
{
_SO_CLROPT(conn->s_options, option);
}
net_unlock();
}
break;
#ifdef CONFIG_NET_BINDTODEVICE
/* Handle the SO_BINDTODEVICE socket-level option.
*
* NOTE: this option makes sense for UDP sockets trying to broadcast
* while their local address is not set, eg, with DHCP requests.
* The problem is that we are not able to determine the interface to be
* used for sending packets when multiple interfaces do not have a
* local address yet. This option can be used to "force" the interface
* used to send the UDP traffic in this connection. Note that it does
* NOT only apply to broadcast packets.
*/
case SO_BINDTODEVICE: /* Bind socket to a specific network device */
{
FAR struct net_driver_s *dev;
/* Check if we are are unbinding the socket */
if (value == NULL || value_len == 0 ||
(value_len > 0 && ((FAR char *)value)[0] == 0))
{
conn->s_boundto = 0; /* This interface is no longer bound */
break;
}
/* No, we are binding a socket to the interface
* Find the interface device with this name.
*/
dev = netdev_findbyname(value);
if (dev == NULL)
{
return -ENODEV;
}
/* Bind the socket to the interface */
DEBUGASSERT(dev->d_ifindex > 0 &&
dev->d_ifindex <= MAX_IFINDEX);
conn->s_boundto = dev->d_ifindex;
break;
}
#endif
/* There options are only valid when used with getopt */
case SO_ACCEPTCONN: /* Reports whether socket listening is enabled */
case SO_ERROR: /* Reports and clears error status. */
case SO_TYPE: /* Reports the socket type */
return -EINVAL;
default:
return -ENOPROTOOPT;
}
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: psock_setsockopt
*
* Description:
* psock_setsockopt() sets the option specified by the 'option' argument,
* at the protocol level specified by the 'level' argument, to the value
* pointed to by the 'value' argument for the socket specified by the
* 'psock' argument.
*
* The 'level' argument specifies the protocol level of the option. To set
* options at the socket level, specify the level argument as SOL_SOCKET.
*
* See <sys/socket.h> a complete list of values for the socket level
* 'option' argument.
*
* Protocol level options, such as SOL_TCP, are defined in
* protocol-specific header files, for example include/netinet/tcp.h
*
* Input Parameters:
* psock Socket structure of socket to operate on
* level Protocol level to set the option
* option identifies the option to set
* value Points to the argument value
* value_len The length of the argument value
*
* Returned Value:
* Returns zero (OK) on success. On failure, it returns a negated errno
* value to indicate the nature of the error:
*
* EDOM
* The send and receive timeout values are too big to fit into the
* timeout fields in the socket structure.
* EINVAL
* The specified option is invalid at the specified socket 'level' or the
* socket has been shut down.
* EISCONN
* The socket is already connected, and a specified option cannot be set
* while the socket is connected.
* ENOPROTOOPT
* The 'option' is not supported by the protocol.
* ENOTSOCK
* The 'sockfd' argument does not refer to a socket.
* ENOMEM
* There was insufficient memory available for the operation to complete.
* ENOBUFS
* Insufficient resources are available in the system to complete the
* call.
*
****************************************************************************/
int psock_setsockopt(FAR struct socket *psock, int level, int option,
FAR const void *value, socklen_t value_len)
{
int ret = -ENOPROTOOPT;
/* Verify that the socket option if valid (but might not be supported ) */
if (!value)
{
return -EFAULT;
}
/* Verify that the sockfd corresponds to valid, allocated socket */
if (psock == NULL || psock->s_conn == NULL)
{
return -EBADF;
}
/* Perform the socket interface operation */
if (psock->s_sockif->si_setsockopt != NULL)
{
ret = psock->s_sockif->si_setsockopt(psock, level, option,
value, value_len);
}
/* Try socket level if the socket interface operation is not available */
if (ret == -ENOPROTOOPT && level == SOL_SOCKET)
{
ret = psock_socketlevel_option(psock, option, value, value_len);
}
/* -ENOTTY really mean -ENOPROTOOPT, but skip the default action */
else if (ret == -ENOTTY)
{
ret = -ENOPROTOOPT;
}
return ret;
}
/****************************************************************************
* Name: setsockopt
*
* Description:
* setsockopt() sets the option specified by the 'option' argument,
* at the protocol level specified by the 'level' argument, to the value
* pointed to by the 'value' argument for the socket associated with the
* file descriptor specified by the 'sockfd' argument.
*
* The 'level' argument specifies the protocol level of the option. To set
* options at the socket level, specify the level argument as SOL_SOCKET.
*
* See <sys/socket.h> a complete list of values for the socket level
* 'option' argument.
*
* Protocol level options, such as SOL_TCP, are defined in
* protocol-specific header files, for example include/netinet/tcp.h
*
* Input Parameters:
* sockfd Socket descriptor of socket
* level Protocol level to set the option
* option identifies the option to set
* value Points to the argument value
* value_len The length of the argument value
*
* Returned Value:
* 0 on success; -1 on failure
*
* EBADF
* The 'sockfd' argument is not a valid socket descriptor.
* EDOM
* The send and receive timeout values are too big to fit into the
* timeout fields in the socket structure.
* EINVAL
* The specified option is invalid at the specified socket 'level' or the
* socket has been shut down.
* EISCONN
* The socket is already connected, and a specified option cannot be set
* while the socket is connected.
* ENOPROTOOPT
* The 'option' is not supported by the protocol.
* ENOTSOCK
* The 'sockfd' argument does not refer to a socket.
* ENOMEM
* There was insufficient memory available for the operation to complete.
* ENOBUFS
* Insufficient resources are available in the system to complete the
* call.
*
****************************************************************************/
int setsockopt(int sockfd, int level, int option, const void *value,
socklen_t value_len)
{
FAR struct socket *psock;
int ret;
/* Get the underlying socket structure */
ret = sockfd_socket(sockfd, &psock);
/* Then let psock_setockopt() do all of the work */
if (ret == OK)
{
ret = psock_setsockopt(psock, level, option, value, value_len);
}
if (ret < 0)
{
set_errno(-ret);
return ERROR;
}
return OK;
}
#endif /* CONFIG_NET && CONFIG_NET_SOCKOPTS */
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