text: /*
   * Copyright (c) 2009 Hiroki Sato.  All rights reserved.
   *
   * 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.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
   */
  
  #ifndef lint
  static const char rcsid[] =
    "$FreeBSD: soc2013/dpl/head/sbin/ifconfig/af_nd6.c 246431 2013-01-09 18:18:08Z ume $";
  #endif /* not lint */
  
  #include <sys/param.h>
  #include <sys/ioctl.h>
  #include <sys/socket.h>
  #include <sys/sysctl.h>
  #include <net/if.h>
  #include <net/route.h>
  
  #include <err.h>
  #include <errno.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <unistd.h>
  #include <ifaddrs.h>
  
  #include <arpa/inet.h>
  
  #include <netinet/in.h>
  #include <net/if_var.h>
  #include <netinet/in_var.h>
  #include <arpa/inet.h>
  #include <netdb.h>
  
  #include <netinet6/nd6.h>
  
  #include "ifconfig.h"
  
  #define	MAX_SYSCTL_TRY	5
  #define	ND6BITS	"\020\001PERFORMNUD\002ACCEPT_RTADV\003PREFER_SOURCE" \
  		"\004IFDISABLED\005DONT_SET_IFROUTE\006AUTO_LINKLOCAL" \
  		"\007NO_RADR\010NO_PREFER_IFACE\020DEFAULTIF"
  
  static int isnd6defif(int);
  void setnd6flags(const char *, int, int, const struct afswtch *);
  void setnd6defif(const char *, int, int, const struct afswtch *);
  void nd6_status(int);
  
  void
  setnd6flags(const char *dummyaddr __unused,
  	int d, int s,
  	const struct afswtch *afp)
  {
  	struct in6_ndireq nd;
  	int error;
  
  	memset(&nd, 0, sizeof(nd));
  	strncpy(nd.ifname, ifr.ifr_name, sizeof(nd.ifname));
  	error = ioctl(s, SIOCGIFINFO_IN6, &nd);
  	if (error) {
  		warn("ioctl(SIOCGIFINFO_IN6)");
  		return;
  	}
  	if (d < 0)
  		nd.ndi.flags &= ~(-d);
  	else
  		nd.ndi.flags |= d;
  	error = ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd);
  	if (error)
  		warn("ioctl(SIOCSIFINFO_IN6)");
  }
  
  void
  setnd6defif(const char *dummyaddr __unused,
  	int d, int s,
  	const struct afswtch *afp)
  {
  	struct in6_ndifreq ndifreq;
  	int ifindex;
  	int error;
  
  	memset(&ndifreq, 0, sizeof(ndifreq));
  	strncpy(ndifreq.ifname, ifr.ifr_name, sizeof(ndifreq.ifname));
  
  	if (d < 0) {
  		if (isnd6defif(s)) {
  			/* ifindex = 0 means to remove default if */
  			ifindex = 0;
  		} else
  			return;
  	} else if ((ifindex = if_nametoindex(ndifreq.ifname)) == 0) {
  		warn("if_nametoindex(%s)", ndifreq.ifname);
  		return;
  	}
  
  	ndifreq.ifindex = ifindex;
  	error = ioctl(s, SIOCSDEFIFACE_IN6, (caddr_t)&ndifreq);
  	if (error)
  		warn("ioctl(SIOCSDEFIFACE_IN6)");
  }
  
  static int
  isnd6defif(int s)
  {
  	struct in6_ndifreq ndifreq;
  	unsigned int ifindex;
  	int error;
  
  	memset(&ndifreq, 0, sizeof(ndifreq));
  	strncpy(ndifreq.ifname, ifr.ifr_name, sizeof(ndifreq.ifname));
  
  	ifindex = if_nametoindex(ndifreq.ifname);
  	error = ioctl(s, SIOCGDEFIFACE_IN6, (caddr_t)&ndifreq);
  	if (error) {
  		warn("ioctl(SIOCGDEFIFACE_IN6)");
  		return (error);
  	}
  	return (ndifreq.ifindex == ifindex);
  }
  
  void
  nd6_status(int s)
  {
  	struct in6_ndireq nd;
  	int s6;
  	int error;
  	int isdefif;
  
  	memset(&nd, 0, sizeof(nd));
  	strncpy(nd.ifname, ifr.ifr_name, sizeof(nd.ifname));
  	if ((s6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
  		if (errno != EAFNOSUPPORT)
  			warn("socket(AF_INET6, SOCK_DGRAM)");
  		return;
  	}
  	error = ioctl(s6, SIOCGIFINFO_IN6, &nd);
  	if (error) {
  		if (errno != EPFNOSUPPORT)
  			warn("ioctl(SIOCGIFINFO_IN6)");
  		close(s6);
  		return;
  	}
  	isdefif = isnd6defif(s6);
  	close(s6);
  	if (nd.ndi.flags == 0 && !isdefif)
  		return;
  	printb("\tnd6 options",
  	    (unsigned int)(nd.ndi.flags | (isdefif << 15)), ND6BITS);
  	putchar('\n');
  }
  