1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
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#include <sys/param.h>
29#include <sys/ioctl.h>
30#include <sys/socket.h>
31#include <sys/sysctl.h>
32#include <net/if.h>
33#include <net/route.h>
34
35#include <err.h>
36#include <errno.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40#include <unistd.h>
41#include <ifaddrs.h>
42
43#include <arpa/inet.h>
44
45#include <netinet/in.h>
46#include <netinet/in_var.h>
47#include <arpa/inet.h>
48#include <netdb.h>
49
50#include <netinet6/nd6.h>
51
52#include "ifconfig.h"
53
54#define	MAX_SYSCTL_TRY	5
55static const char *ND6BITS[] = {
56	[0]  = "PERFORMNUD",
57	[1]  = "ACCEPT_RTADV",
58	[2]  = "PREFER_SOURCE",
59	[3]  = "IFDISABLED",
60	[4]  = "DONT_SET_IFROUTE",
61	[5]  = "AUTO_LINKLOCAL",
62	[6]  = "NO_RADR",
63	[7]  = "NO_PREFER_IFACE",
64	[8]  = "NO_DAD",
65#ifdef DRAFT_IETF_6MAN_IPV6ONLY_FLAG
66	[9]  = "IPV6_ONLY",
67	[10] = "IPV6_ONLY_MANUAL",
68#endif
69	[15] = "DEFAULTIF",
70};
71
72static int isnd6defif(if_ctx *ctx, int s);
73void setnd6flags(if_ctx *, const char *, int);
74void setnd6defif(if_ctx *,const char *, int);
75void nd6_status(if_ctx *);
76
77void
78setnd6flags(if_ctx *ctx, const char *dummyaddr __unused, int d)
79{
80	struct in6_ndireq nd = {};
81	int error;
82
83	strlcpy(nd.ifname, ctx->ifname, sizeof(nd.ifname));
84	error = ioctl_ctx(ctx, SIOCGIFINFO_IN6, &nd);
85	if (error) {
86		warn("ioctl(SIOCGIFINFO_IN6)");
87		return;
88	}
89	if (d < 0)
90		nd.ndi.flags &= ~(-d);
91	else
92		nd.ndi.flags |= d;
93	error = ioctl_ctx(ctx, SIOCSIFINFO_IN6, (caddr_t)&nd);
94	if (error)
95		warn("ioctl(SIOCSIFINFO_IN6)");
96}
97
98void
99setnd6defif(if_ctx *ctx, const char *dummyaddr __unused, int d)
100{
101	struct in6_ndifreq ndifreq = {};
102	int ifindex;
103	int error;
104
105	strlcpy(ndifreq.ifname, ctx->ifname, sizeof(ndifreq.ifname));
106
107	if (d < 0) {
108		if (isnd6defif(ctx, ctx->io_s)) {
109			/* ifindex = 0 means to remove default if */
110			ifindex = 0;
111		} else
112			return;
113	} else if ((ifindex = if_nametoindex(ndifreq.ifname)) == 0) {
114		warn("if_nametoindex(%s)", ndifreq.ifname);
115		return;
116	}
117
118	ndifreq.ifindex = ifindex;
119	error = ioctl_ctx(ctx, SIOCSDEFIFACE_IN6, (caddr_t)&ndifreq);
120	if (error)
121		warn("ioctl(SIOCSDEFIFACE_IN6)");
122}
123
124static int
125isnd6defif(if_ctx *ctx, int s)
126{
127	struct in6_ndifreq ndifreq = {};
128	unsigned int ifindex;
129	int error;
130
131	strlcpy(ndifreq.ifname, ctx->ifname, sizeof(ndifreq.ifname));
132
133	ifindex = if_nametoindex(ndifreq.ifname);
134	error = ioctl(s, SIOCGDEFIFACE_IN6, (caddr_t)&ndifreq);
135	if (error) {
136		warn("ioctl(SIOCGDEFIFACE_IN6)");
137		return (error);
138	}
139	return (ndifreq.ifindex == ifindex);
140}
141
142void
143nd6_status(if_ctx *ctx)
144{
145	struct in6_ndireq nd = {};
146	int s6;
147	int error;
148	int isdefif;
149	uint32_t bits;
150
151	strlcpy(nd.ifname, ctx->ifname, sizeof(nd.ifname));
152	if ((s6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
153		if (errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT)
154			warn("socket(AF_INET6, SOCK_DGRAM)");
155		return;
156	}
157	error = ioctl(s6, SIOCGIFINFO_IN6, &nd);
158	if (error) {
159		if (errno != EPFNOSUPPORT)
160			warn("ioctl(SIOCGIFINFO_IN6)");
161		close(s6);
162		return;
163	}
164	isdefif = isnd6defif(ctx, s6);
165	close(s6);
166	if (nd.ndi.flags == 0 && !isdefif)
167		return;
168	bits = (nd.ndi.flags | (isdefif << 15));
169	printf("\tnd6 options=%x", bits);
170	print_bits("options", &bits, 1, ND6BITS, nitems(ND6BITS));
171	putchar('\n');
172}
173