xref: /freebsd/sbin/ifconfig/af_nd6.c (revision 264104f26834fdb27974e0c5fdedf8f2f5a90383)
1  /*
2   * Copyright (c) 2009 Hiroki Sato.  All rights reserved.
3   *
4   * Redistribution and use in source and binary forms, with or without
5   * modification, are permitted provided that the following conditions
6   * are met:
7   * 1. Redistributions of source code must retain the above copyright
8   *    notice, this list of conditions and the following disclaimer.
9   * 2. Redistributions in binary form must reproduce the above copyright
10   *    notice, this list of conditions and the following disclaimer in the
11   *    documentation and/or other materials provided with the distribution.
12   *
13   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
14   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
17   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23   * SUCH DAMAGE.
24   */
25  
26  #ifndef lint
27  static const char rcsid[] =
28    "$FreeBSD$";
29  #endif /* not lint */
30  
31  #include <sys/param.h>
32  #include <sys/ioctl.h>
33  #include <sys/socket.h>
34  #include <sys/sysctl.h>
35  #include <net/if.h>
36  #include <net/route.h>
37  
38  #include <err.h>
39  #include <errno.h>
40  #include <stdio.h>
41  #include <stdlib.h>
42  #include <string.h>
43  #include <unistd.h>
44  #include <ifaddrs.h>
45  
46  #include <arpa/inet.h>
47  
48  #include <netinet/in.h>
49  #include <netinet/in_var.h>
50  #include <arpa/inet.h>
51  #include <netdb.h>
52  
53  #include <netinet6/nd6.h>
54  
55  #include "ifconfig.h"
56  
57  #define	MAX_SYSCTL_TRY	5
58  #define	ND6BITS	"\020\001PERFORMNUD\002ACCEPT_RTADV\003PREFER_SOURCE" \
59  		"\004IFDISABLED\005DONT_SET_IFROUTE\006AUTO_LINKLOCAL" \
60  		"\007NO_RADR\010NO_PREFER_IFACE\011NO_DAD\020DEFAULTIF"
61  
62  static int isnd6defif(int);
63  void setnd6flags(const char *, int, int, const struct afswtch *);
64  void setnd6defif(const char *, int, int, const struct afswtch *);
65  void nd6_status(int);
66  
67  void
68  setnd6flags(const char *dummyaddr __unused,
69  	int d, int s,
70  	const struct afswtch *afp)
71  {
72  	struct in6_ndireq nd;
73  	int error;
74  
75  	memset(&nd, 0, sizeof(nd));
76  	strlcpy(nd.ifname, ifr.ifr_name, sizeof(nd.ifname));
77  	error = ioctl(s, SIOCGIFINFO_IN6, &nd);
78  	if (error) {
79  		warn("ioctl(SIOCGIFINFO_IN6)");
80  		return;
81  	}
82  	if (d < 0)
83  		nd.ndi.flags &= ~(-d);
84  	else
85  		nd.ndi.flags |= d;
86  	error = ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd);
87  	if (error)
88  		warn("ioctl(SIOCSIFINFO_IN6)");
89  }
90  
91  void
92  setnd6defif(const char *dummyaddr __unused,
93  	int d, int s,
94  	const struct afswtch *afp)
95  {
96  	struct in6_ndifreq ndifreq;
97  	int ifindex;
98  	int error;
99  
100  	memset(&ndifreq, 0, sizeof(ndifreq));
101  	strlcpy(ndifreq.ifname, ifr.ifr_name, sizeof(ndifreq.ifname));
102  
103  	if (d < 0) {
104  		if (isnd6defif(s)) {
105  			/* ifindex = 0 means to remove default if */
106  			ifindex = 0;
107  		} else
108  			return;
109  	} else if ((ifindex = if_nametoindex(ndifreq.ifname)) == 0) {
110  		warn("if_nametoindex(%s)", ndifreq.ifname);
111  		return;
112  	}
113  
114  	ndifreq.ifindex = ifindex;
115  	error = ioctl(s, SIOCSDEFIFACE_IN6, (caddr_t)&ndifreq);
116  	if (error)
117  		warn("ioctl(SIOCSDEFIFACE_IN6)");
118  }
119  
120  static int
121  isnd6defif(int s)
122  {
123  	struct in6_ndifreq ndifreq;
124  	unsigned int ifindex;
125  	int error;
126  
127  	memset(&ndifreq, 0, sizeof(ndifreq));
128  	strlcpy(ndifreq.ifname, ifr.ifr_name, sizeof(ndifreq.ifname));
129  
130  	ifindex = if_nametoindex(ndifreq.ifname);
131  	error = ioctl(s, SIOCGDEFIFACE_IN6, (caddr_t)&ndifreq);
132  	if (error) {
133  		warn("ioctl(SIOCGDEFIFACE_IN6)");
134  		return (error);
135  	}
136  	return (ndifreq.ifindex == ifindex);
137  }
138  
139  void
140  nd6_status(int s)
141  {
142  	struct in6_ndireq nd;
143  	int s6;
144  	int error;
145  	int isdefif;
146  
147  	memset(&nd, 0, sizeof(nd));
148  	strlcpy(nd.ifname, ifr.ifr_name, sizeof(nd.ifname));
149  	if ((s6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
150  		if (errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT)
151  			warn("socket(AF_INET6, SOCK_DGRAM)");
152  		return;
153  	}
154  	error = ioctl(s6, SIOCGIFINFO_IN6, &nd);
155  	if (error) {
156  		if (errno != EPFNOSUPPORT)
157  			warn("ioctl(SIOCGIFINFO_IN6)");
158  		close(s6);
159  		return;
160  	}
161  	isdefif = isnd6defif(s6);
162  	close(s6);
163  	if (nd.ndi.flags == 0 && !isdefif)
164  		return;
165  	printb("\tnd6 options",
166  	    (unsigned int)(nd.ndi.flags | (isdefif << 15)), ND6BITS);
167  	putchar('\n');
168  }
169