text: /****************************************************************************
   *
   * Copyright 2016 Samsung Electronics All Rights Reserved.
   *
   * Licensed 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.
   *
   ****************************************************************************/
  /****************************************************************************
   * netutils/netlib/netlib_setipv6netmask.c
   *
   *   Copyright (C) 2015 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 <tinyara/config.h>
  #if defined(CONFIG_NET_IPv6) && CONFIG_NSOCKET_DESCRIPTORS > 0
  
  #include <sys/socket.h>
  #include <sys/ioctl.h>
  
  #include <unistd.h>
  #include <string.h>
  #include <errno.h>
  
  #include <netinet/in.h>
  #include <net/if.h>
  
  #include <apps/netutils/netlib.h>
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: netlib_set_ipv6netmask
   *
   * Description:
   *   Set the netmask
   *
   * Parameters:
   *   ifname   The name of the interface to use
   *   ipaddr   The address to set
   *
   * Return:
   *   0 on success; -1 on failure
   *
   ****************************************************************************/
  
  int netlib_set_ipv6netmask(FAR const char *ifname, FAR const struct in6_addr *addr)
  {
  	int ret = ERROR;
  
  	if (ifname && addr) {
  		int sockfd = socket(PF_INET6, NETLIB_SOCK_IOCTL, 0);
  		if (sockfd >= 0) {
  			FAR struct sockaddr_in6 *inaddr;
  			struct lifreq req;
  
  			/* Add the device name to the request */
  
  			strncpy(req.lifr_name, ifname, IFNAMSIZ);
  
  			/* Add the INET address to the request */
  
  			inaddr = (FAR struct sockaddr_in6 *)&req.lifr_addr;
  			inaddr->sin6_family = AF_INET6;
  			inaddr->sin6_port = 0;
  			memcpy(&inaddr->sin6_addr, addr, sizeof(struct in6_addr));
  
  			ret = ioctl(sockfd, SIOCSLIFNETMASK, (unsigned long)((uintptr_t)&req));
  			close(sockfd);
  		}
  	}
  
  	return ret;
  }
  
  #endif							/* CONFIG_NET_IPv6 && CONFIG_NSOCKET_DESCRIPTORS */
  