nuttx/net/socket/setsockopt.c

/****************************************************************************
 * net/socket/setsockopt.c
 *
 *   Copyright (C) 2007, 2008, 2011-2012, 2014-2015, 2017-2018, 2020 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>
#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 "socket/socket.h"
#include "inet/inet.h"
#include "tcp/tcp.h"
#include "udp/udp.h"
#include "usrsock/usrsock.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)
{
  /* Verify that the socket option if valid (but might not be supported ) */

  if (!_SO_SETVALID(option) || !value)
    {
      return -EINVAL;
    }

  /* Verify that the sockfd corresponds to valid, allocated socket */

  if (psock == NULL || psock->s_crefs <= 0)
    {
      return -EBADF;
    }

#ifdef CONFIG_NET_USRSOCK
  if (psock->s_type == SOCK_USRSOCK_TYPE)
    {
      FAR struct usrsock_conn_s *conn = psock->s_conn;

      DEBUGASSERT(conn);

      /* Some of the socket options are handled from this function. */

      switch (option)
        {
          case SO_RCVTIMEO: /* Rx timeouts can be handled at NuttX side, thus
                             * simplify daemon implementation. */
          case SO_SNDTIMEO: /* Rx timeouts can be handled at NuttX side, thus
                             * simplify daemon implementation. */
            break;

          default:          /* Other options are passed to usrsock daemon. */
            {
              return usrsock_setsockopt(conn, SOL_SOCKET, option, value,
                                        value_len);
            }
        }
    }
#endif

  /* Process the option */

  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_BROADCAST:  /* Permits sending of broadcast messages */
      case SO_DEBUG:      /* Enables recording of debugging information */
      case SO_DONTROUTE:  /* Requests outgoing messages bypass standard routing */
#ifndef CONFIG_NET_TCPPROTO_OPTIONS
      case SO_KEEPALIVE:  /* Verifies TCP connections active by enabling the
                           * periodic transmission of probes */
#endif
      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(psock->s_options, option);
            }
          else
            {
              _SO_CLROPT(psock->s_options, option);
            }

          net_unlock();
        }
        break;

#ifdef CONFIG_NET_TCPPROTO_OPTIONS
      /* Any connection-oriented protocol could potentially support
       * SO_KEEPALIVE.  However, this option is currently only available for
       * TCP/IP.
       *
       * NOTE: SO_KEEPALIVE is not really a socket-level option; it is a
       * protocol-level option.  A given TCP connection may service multiple
       * sockets (via dup'ing of the socket).  There is, however, still only
       * one connection to be monitored and that is a global attribute across
       * all of the clones that may use the underlying connection.
       */

      case SO_KEEPALIVE:  /* Verifies TCP connections active by enabling the
                           * periodic transmission of probes */
        return tcp_setsockopt(psock, option, value, value_len);
#endif

      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)
            {
              psock->s_rcvtimeo = timeo;
            }
          else
            {
              psock->s_sndtimeo = timeo;
            }

          /* Set/clear the corresponding enable/disable bit */

          if (timeo)
            {
              _SO_CLROPT(psock->s_options, option);
            }
          else
            {
              _SO_SETOPT(psock->s_options, option);
            }
        }
        break;

#ifdef CONFIG_NET_SOLINGER
      case SO_LINGER:  /* Lingers on a close() if data is present */
        {
          FAR struct linger *setting;

          /* Verify that option is at least the size of an 'struct linger'. */

          if (value_len < sizeof(FAR struct linger))
            {
              return -EINVAL;
            }

          /* Get the value.  Is the option being set or cleared? */

          setting = (FAR struct linger *)value;

          /* Lock the network so that we have exclusive access to the socket
           * options.
           */

          net_lock();

          /* Set or clear the linger option bit and linger time (in deciseconds) */

          if (setting->l_onoff)
            {
              _SO_SETOPT(psock->s_options, option);
              psock->s_linger = 10 * setting->l_linger;
            }
          else
            {
              _SO_CLROPT(psock->s_options, option);
              psock->s_linger = 0;
            }

          net_unlock();
        }
        break;
#endif
      /* The following are not yet implemented */

      case SO_RCVBUF:     /* Sets receive buffer size */
      case SO_RCVLOWAT:   /* Sets the minimum number of bytes to input */
      case SO_SNDBUF:     /* Sets send buffer size */
      case SO_SNDLOWAT:   /* Sets the minimum number of bytes to output */

      /* 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 */

      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;

  /* Handle setting of the socket option according to the level at which
   * option should be applied.
   */

  switch (level)
    {
      case SOL_SOCKET: /* Socket-level options (see include/sys/socket.h) */
        ret = psock_socketlevel_option(psock, option, value, value_len);
        break;

      case SOL_TCP:    /* TCP protocol socket options (see include/netinet/tcp.h) */
#ifdef CONFIG_NET_TCPPROTO_OPTIONS
        ret = tcp_setsockopt(psock, option, value, value_len);
        break;
#endif

      case SOL_UDP:    /* UDP protocol socket options (see include/netinet/udp.h) */
#ifdef CONFIG_NET_UDPPROTO_OPTIONS
        ret = udp_setsockopt(psock, option, value, value_len);
        break;
#endif

      /* These levels are defined in sys/socket.h, but are not yet
       * implemented.
       */

#ifdef CONFIG_NET_IPv4
      case SOL_IP:     /* TCP protocol socket options (see include/netinet/in.h) */
        ret = ipv4_setsockopt(psock, option, value, value_len);
        break;
#endif

#ifdef CONFIG_NET_IPv6
      case SOL_IPV6:   /* TCP protocol socket options (see include/netinet/in.h) */
        ret = ipv6_setsockopt(psock, option, value, value_len);
        break;
#endif

      default:         /* The provided level is invalid */
        ret = -EINVAL;
        break;
    }

  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 */

  psock = sockfd_socket(sockfd);

  /* Then let psock_setockopt() do all of the work */

  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 */