1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2009 Hiroki Sato.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#ifndef lint
29static const char rcsid[] =
30  "$FreeBSD: stable/11/sbin/ifconfig/af_nd6.c 330449 2018-03-05 07:26:05Z eadler $";
31#endif /* not lint */
32
33#include <sys/param.h>
34#include <sys/ioctl.h>
35#include <sys/socket.h>
36#include <sys/sysctl.h>
37#include <net/if.h>
38#include <net/route.h>
39
40#include <err.h>
41#include <errno.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <string.h>
45#include <unistd.h>
46#include <ifaddrs.h>
47
48#include <arpa/inet.h>
49
50#include <netinet/in.h>
51#include <netinet/in_var.h>
52#include <arpa/inet.h>
53#include <netdb.h>
54
55#include <netinet6/nd6.h>
56
57#include "ifconfig.h"
58
59#define	MAX_SYSCTL_TRY	5
60#define	ND6BITS	"\020\001PERFORMNUD\002ACCEPT_RTADV\003PREFER_SOURCE" \
61		"\004IFDISABLED\005DONT_SET_IFROUTE\006AUTO_LINKLOCAL" \
62		"\007NO_RADR\010NO_PREFER_IFACE\011NO_DAD\020DEFAULTIF"
63
64static int isnd6defif(int);
65void setnd6flags(const char *, int, int, const struct afswtch *);
66void setnd6defif(const char *, int, int, const struct afswtch *);
67void nd6_status(int);
68
69void
70setnd6flags(const char *dummyaddr __unused,
71	int d, int s,
72	const struct afswtch *afp)
73{
74	struct in6_ndireq nd;
75	int error;
76
77	memset(&nd, 0, sizeof(nd));
78	strlcpy(nd.ifname, ifr.ifr_name, sizeof(nd.ifname));
79	error = ioctl(s, SIOCGIFINFO_IN6, &nd);
80	if (error) {
81		warn("ioctl(SIOCGIFINFO_IN6)");
82		return;
83	}
84	if (d < 0)
85		nd.ndi.flags &= ~(-d);
86	else
87		nd.ndi.flags |= d;
88	error = ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd);
89	if (error)
90		warn("ioctl(SIOCSIFINFO_IN6)");
91}
92
93void
94setnd6defif(const char *dummyaddr __unused,
95	int d, int s,
96	const struct afswtch *afp)
97{
98	struct in6_ndifreq ndifreq;
99	int ifindex;
100	int error;
101
102	memset(&ndifreq, 0, sizeof(ndifreq));
103	strlcpy(ndifreq.ifname, ifr.ifr_name, sizeof(ndifreq.ifname));
104
105	if (d < 0) {
106		if (isnd6defif(s)) {
107			/* ifindex = 0 means to remove default if */
108			ifindex = 0;
109		} else
110			return;
111	} else if ((ifindex = if_nametoindex(ndifreq.ifname)) == 0) {
112		warn("if_nametoindex(%s)", ndifreq.ifname);
113		return;
114	}
115
116	ndifreq.ifindex = ifindex;
117	error = ioctl(s, SIOCSDEFIFACE_IN6, (caddr_t)&ndifreq);
118	if (error)
119		warn("ioctl(SIOCSDEFIFACE_IN6)");
120}
121
122static int
123isnd6defif(int s)
124{
125	struct in6_ndifreq ndifreq;
126	unsigned int ifindex;
127	int error;
128
129	memset(&ndifreq, 0, sizeof(ndifreq));
130	strlcpy(ndifreq.ifname, ifr.ifr_name, sizeof(ndifreq.ifname));
131
132	ifindex = if_nametoindex(ndifreq.ifname);
133	error = ioctl(s, SIOCGDEFIFACE_IN6, (caddr_t)&ndifreq);
134	if (error) {
135		warn("ioctl(SIOCGDEFIFACE_IN6)");
136		return (error);
137	}
138	return (ndifreq.ifindex == ifindex);
139}
140
141void
142nd6_status(int s)
143{
144	struct in6_ndireq nd;
145	int s6;
146	int error;
147	int isdefif;
148
149	memset(&nd, 0, sizeof(nd));
150	strlcpy(nd.ifname, ifr.ifr_name, sizeof(nd.ifname));
151	if ((s6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
152		if (errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT)
153			warn("socket(AF_INET6, SOCK_DGRAM)");
154		return;
155	}
156	error = ioctl(s6, SIOCGIFINFO_IN6, &nd);
157	if (error) {
158		if (errno != EPFNOSUPPORT)
159			warn("ioctl(SIOCGIFINFO_IN6)");
160		close(s6);
161		return;
162	}
163	isdefif = isnd6defif(s6);
164	close(s6);
165	if (nd.ndi.flags == 0 && !isdefif)
166		return;
167	printb("\tnd6 options",
168	    (unsigned int)(nd.ndi.flags | (isdefif << 15)), ND6BITS);
169	putchar('\n');
170}
171