xref: /freebsd/sbin/ifconfig/af_nd6.c (revision 6829dae12bb055451fa467da4589c43bd03b1e64)
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
29 static const char rcsid[] =
30   "$FreeBSD$";
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 #ifdef DRAFT_IETF_6MAN_IPV6ONLY_FLAG
61 #define	ND6BITS	"\020\001PERFORMNUD\002ACCEPT_RTADV\003PREFER_SOURCE" \
62 		"\004IFDISABLED\005DONT_SET_IFROUTE\006AUTO_LINKLOCAL" \
63 		"\007NO_RADR\010NO_PREFER_IFACE\011NO_DAD" \
64 		"\012IPV6_ONLY" \
65 		"\020DEFAULTIF"
66 #else
67 #define	ND6BITS	"\020\001PERFORMNUD\002ACCEPT_RTADV\003PREFER_SOURCE" \
68 		"\004IFDISABLED\005DONT_SET_IFROUTE\006AUTO_LINKLOCAL" \
69 		"\007NO_RADR\010NO_PREFER_IFACE\011NO_DAD\020DEFAULTIF"
70 #endif
71 
72 static int isnd6defif(int);
73 void setnd6flags(const char *, int, int, const struct afswtch *);
74 void setnd6defif(const char *, int, int, const struct afswtch *);
75 void nd6_status(int);
76 
77 void
78 setnd6flags(const char *dummyaddr __unused,
79 	int d, int s,
80 	const struct afswtch *afp)
81 {
82 	struct in6_ndireq nd;
83 	int error;
84 
85 	memset(&nd, 0, sizeof(nd));
86 	strlcpy(nd.ifname, ifr.ifr_name, sizeof(nd.ifname));
87 	error = ioctl(s, SIOCGIFINFO_IN6, &nd);
88 	if (error) {
89 		warn("ioctl(SIOCGIFINFO_IN6)");
90 		return;
91 	}
92 	if (d < 0)
93 		nd.ndi.flags &= ~(-d);
94 	else
95 		nd.ndi.flags |= d;
96 	error = ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd);
97 	if (error)
98 		warn("ioctl(SIOCSIFINFO_IN6)");
99 }
100 
101 void
102 setnd6defif(const char *dummyaddr __unused,
103 	int d, int s,
104 	const struct afswtch *afp)
105 {
106 	struct in6_ndifreq ndifreq;
107 	int ifindex;
108 	int error;
109 
110 	memset(&ndifreq, 0, sizeof(ndifreq));
111 	strlcpy(ndifreq.ifname, ifr.ifr_name, sizeof(ndifreq.ifname));
112 
113 	if (d < 0) {
114 		if (isnd6defif(s)) {
115 			/* ifindex = 0 means to remove default if */
116 			ifindex = 0;
117 		} else
118 			return;
119 	} else if ((ifindex = if_nametoindex(ndifreq.ifname)) == 0) {
120 		warn("if_nametoindex(%s)", ndifreq.ifname);
121 		return;
122 	}
123 
124 	ndifreq.ifindex = ifindex;
125 	error = ioctl(s, SIOCSDEFIFACE_IN6, (caddr_t)&ndifreq);
126 	if (error)
127 		warn("ioctl(SIOCSDEFIFACE_IN6)");
128 }
129 
130 static int
131 isnd6defif(int s)
132 {
133 	struct in6_ndifreq ndifreq;
134 	unsigned int ifindex;
135 	int error;
136 
137 	memset(&ndifreq, 0, sizeof(ndifreq));
138 	strlcpy(ndifreq.ifname, ifr.ifr_name, sizeof(ndifreq.ifname));
139 
140 	ifindex = if_nametoindex(ndifreq.ifname);
141 	error = ioctl(s, SIOCGDEFIFACE_IN6, (caddr_t)&ndifreq);
142 	if (error) {
143 		warn("ioctl(SIOCGDEFIFACE_IN6)");
144 		return (error);
145 	}
146 	return (ndifreq.ifindex == ifindex);
147 }
148 
149 void
150 nd6_status(int s)
151 {
152 	struct in6_ndireq nd;
153 	int s6;
154 	int error;
155 	int isdefif;
156 
157 	memset(&nd, 0, sizeof(nd));
158 	strlcpy(nd.ifname, ifr.ifr_name, sizeof(nd.ifname));
159 	if ((s6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
160 		if (errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT)
161 			warn("socket(AF_INET6, SOCK_DGRAM)");
162 		return;
163 	}
164 	error = ioctl(s6, SIOCGIFINFO_IN6, &nd);
165 	if (error) {
166 		if (errno != EPFNOSUPPORT)
167 			warn("ioctl(SIOCGIFINFO_IN6)");
168 		close(s6);
169 		return;
170 	}
171 	isdefif = isnd6defif(s6);
172 	close(s6);
173 	if (nd.ndi.flags == 0 && !isdefif)
174 		return;
175 	printb("\tnd6 options",
176 	    (unsigned int)(nd.ndi.flags | (isdefif << 15)), ND6BITS);
177 	putchar('\n');
178 }
179