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- /****************************************************************************
- * net/udp/udp_setsockopt.c
- *
- * Copyright (C) 2018 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>
- #include <sys/time.h>
- #include <stdint.h>
- #include <errno.h>
- #include <assert.h>
- #include <debug.h>
- #include <netinet/udp.h>
- #include <nuttx/clock.h>
- #include <nuttx/net/net.h>
- #include <nuttx/net/udp.h>
- #include "socket/socket.h"
- #include "utils/utils.h"
- #include "netdev/netdev.h"
- #include "udp/udp.h"
- #ifdef CONFIG_NET_UDPPROTO_OPTIONS
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: udp_setsockopt
- *
- * Description:
- * udp_setsockopt() sets the UDP-protocol option specified by the
- * 'option' argument to the value pointed to by the 'value' argument for
- * the socket specified by the 'psock' argument.
- *
- * See <netinet/udp.h> for the a complete list of values of UDP protocol
- * options.
- *
- * 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.
- *
- ****************************************************************************/
- int udp_setsockopt(FAR struct socket *psock, int option,
- FAR const void *value, socklen_t value_len)
- {
- #ifdef CONFIG_NET_UDP_BINDTODEVICE
- /* Keep alive options are the only UDP protocol socket option currently
- * supported.
- */
- FAR struct udp_conn_s *conn;
- int ret;
- DEBUGASSERT(psock != NULL && value != NULL && psock->s_conn != NULL);
- conn = (FAR struct udp_conn_s *)psock->s_conn;
- /* All of the UDP protocol options apply only UDP sockets. The sockets
- * do not have to be connected.. that might occur later with the KeepAlive
- * already configured.
- */
- if (psock->s_type != SOCK_DGRAM)
- {
- nerr("ERROR: Not a UDP socket\n");
- return -ENOTCONN;
- }
- /* Handle the UDP-protocol options */
- switch (option)
- {
- #ifdef CONFIG_NET_UDP_BINDTODEVICE
- /* Handle the UDP_BINDTODEVICE socket-level option.
- *
- * NOTE: UDP_BINDTODEVICE is declared in linux as SO_BINDTODEVICE,
- * but this option only 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 UDP_BINDTODEVICE: /* Bind socket to a specific network device */
- if (value == NULL || value_len == 0 ||
- (value_len > 0 && ((FAR char *)value)[0] == 0))
- {
- conn->boundto = 0; /* This interface is no longer bound */
- ret = OK;
- }
- else
- {
- int ifindex;
- /* Get the interface index corresponding to the interface name */
- ifindex = netdev_nametoindex(value);
- if (ifindex >= 0)
- {
- DEBUGASSERT(ifindex > 0 && ifindex <= MAX_IFINDEX);
- conn->boundto = ifindex;
- ret = OK;
- }
- else
- {
- ret = ifindex;
- }
- }
- break;
- #endif
- default:
- nerr("ERROR: Unrecognized UDP option: %d\n", option);
- ret = -ENOPROTOOPT;
- break;
- }
- return ret;
- #else
- return -ENOPROTOOPT;
- #endif /* CONFIG_NET_UDP_BINDTODEVICE */
- }
- #endif /* CONFIG_NET_UDPPROTO_OPTIONS */
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