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
27static 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 <net/if_var.h>
50#include <netinet/in_var.h>
51#include <arpa/inet.h>
52#include <netdb.h>
53
54#include <netinet6/nd6.h>
55
56#include "ifconfig.h"
57
58#define	MAX_SYSCTL_TRY	5
59#define	ND6BITS	"\020\001PERFORMNUD\002ACCEPT_RTADV\003PREFER_SOURCE" \
60		"\004IFDISABLED\005DONT_SET_IFROUTE\006AUTO_LINKLOCAL" \
61		"\007NO_RADR\010NO_PREFER_IFACE\020DEFAULTIF"
62
63static int isnd6defif(int);
64void setnd6flags(const char *, int, int, const struct afswtch *);
65void setnd6defif(const char *, int, int, const struct afswtch *);
66void nd6_status(int);
67
68void
69setnd6flags(const char *dummyaddr __unused,
70	int d, int s,
71	const struct afswtch *afp)
72{
73	struct in6_ndireq nd;
74	int error;
75
76	memset(&nd, 0, sizeof(nd));
77	strncpy(nd.ifname, ifr.ifr_name, sizeof(nd.ifname));
78	error = ioctl(s, SIOCGIFINFO_IN6, &nd);
79	if (error) {
80		warn("ioctl(SIOCGIFINFO_IN6)");
81		return;
82	}
83	if (d < 0)
84		nd.ndi.flags &= ~(-d);
85	else
86		nd.ndi.flags |= d;
87	error = ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd);
88	if (error)
89		warn("ioctl(SIOCSIFINFO_IN6)");
90}
91
92void
93setnd6defif(const char *dummyaddr __unused,
94	int d, int s,
95	const struct afswtch *afp)
96{
97	struct in6_ndifreq ndifreq;
98	int ifindex;
99	int error;
100
101	memset(&ndifreq, 0, sizeof(ndifreq));
102	strncpy(ndifreq.ifname, ifr.ifr_name, sizeof(ndifreq.ifname));
103
104	if (d < 0) {
105		if (isnd6defif(s)) {
106			/* ifindex = 0 means to remove default if */
107			ifindex = 0;
108		} else
109			return;
110	} else if ((ifindex = if_nametoindex(ndifreq.ifname)) == 0) {
111		warn("if_nametoindex(%s)", ndifreq.ifname);
112		return;
113	}
114
115	ndifreq.ifindex = ifindex;
116	error = ioctl(s, SIOCSDEFIFACE_IN6, (caddr_t)&ndifreq);
117	if (error)
118		warn("ioctl(SIOCSDEFIFACE_IN6)");
119}
120
121static int
122isnd6defif(int s)
123{
124	struct in6_ndifreq ndifreq;
125	unsigned int ifindex;
126	int error;
127
128	memset(&ndifreq, 0, sizeof(ndifreq));
129	strncpy(ndifreq.ifname, ifr.ifr_name, sizeof(ndifreq.ifname));
130
131	ifindex = if_nametoindex(ndifreq.ifname);
132	error = ioctl(s, SIOCGDEFIFACE_IN6, (caddr_t)&ndifreq);
133	if (error) {
134		warn("ioctl(SIOCGDEFIFACE_IN6)");
135		return (error);
136	}
137	return (ndifreq.ifindex == ifindex);
138}
139
140void
141nd6_status(int s)
142{
143	struct in6_ndireq nd;
144	int s6;
145	int error;
146	int isdefif;
147
148	memset(&nd, 0, sizeof(nd));
149	strncpy(nd.ifname, ifr.ifr_name, sizeof(nd.ifname));
150	if ((s6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
151		if (errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT)
152			warn("socket(AF_INET6, SOCK_DGRAM)");
153		return;
154	}
155	error = ioctl(s6, SIOCGIFINFO_IN6, &nd);
156	if (error) {
157		if (errno != EPFNOSUPPORT)
158			warn("ioctl(SIOCGIFINFO_IN6)");
159		close(s6);
160		return;
161	}
162	isdefif = isnd6defif(s6);
163	close(s6);
164	if (nd.ndi.flags == 0 && !isdefif)
165		return;
166	printb("\tnd6 options",
167	    (unsigned int)(nd.ndi.flags | (isdefif << 15)), ND6BITS);
168	putchar('\n');
169}
170