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
55 static 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
72 static int isnd6defif(if_ctx *ctx, int s);
73 void setnd6flags(if_ctx *, const char *, int);
74 void setnd6defif(if_ctx *,const char *, int);
75 void nd6_status(if_ctx *);
76
77 void
setnd6flags(if_ctx * ctx,const char * dummyaddr __unused,int d)78 setnd6flags(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
98 void
setnd6defif(if_ctx * ctx,const char * dummyaddr __unused,int d)99 setnd6defif(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
124 static int
isnd6defif(if_ctx * ctx,int s)125 isnd6defif(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
142 void
nd6_status(if_ctx * ctx)143 nd6_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