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 #ifdef DRAFT_IETF_6MAN_IPV6ONLY_FLAG
56 #define ND6BITS "\020\001PERFORMNUD\002ACCEPT_RTADV\003PREFER_SOURCE" \
57 "\004IFDISABLED\005DONT_SET_IFROUTE\006AUTO_LINKLOCAL" \
58 "\007NO_RADR\010NO_PREFER_IFACE\011NO_DAD" \
59 "\012IPV6_ONLY\013IPV6_ONLY_MANUAL" \
60 "\020DEFAULTIF"
61 #else
62 #define ND6BITS "\020\001PERFORMNUD\002ACCEPT_RTADV\003PREFER_SOURCE" \
63 "\004IFDISABLED\005DONT_SET_IFROUTE\006AUTO_LINKLOCAL" \
64 "\007NO_RADR\010NO_PREFER_IFACE\011NO_DAD\020DEFAULTIF"
65 #endif
66
67 static int isnd6defif(if_ctx *ctx, int s);
68 void setnd6flags(if_ctx *, const char *, int);
69 void setnd6defif(if_ctx *,const char *, int);
70 void nd6_status(if_ctx *);
71
72 void
setnd6flags(if_ctx * ctx,const char * dummyaddr __unused,int d)73 setnd6flags(if_ctx *ctx, const char *dummyaddr __unused, int d)
74 {
75 struct in6_ndireq nd = {};
76 int error;
77
78 strlcpy(nd.ifname, ctx->ifname, sizeof(nd.ifname));
79 error = ioctl_ctx(ctx, 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_ctx(ctx, SIOCSIFINFO_IN6, (caddr_t)&nd);
89 if (error)
90 warn("ioctl(SIOCSIFINFO_IN6)");
91 }
92
93 void
setnd6defif(if_ctx * ctx,const char * dummyaddr __unused,int d)94 setnd6defif(if_ctx *ctx, const char *dummyaddr __unused, int d)
95 {
96 struct in6_ndifreq ndifreq = {};
97 int ifindex;
98 int error;
99
100 strlcpy(ndifreq.ifname, ctx->ifname, sizeof(ndifreq.ifname));
101
102 if (d < 0) {
103 if (isnd6defif(ctx, ctx->io_s)) {
104 /* ifindex = 0 means to remove default if */
105 ifindex = 0;
106 } else
107 return;
108 } else if ((ifindex = if_nametoindex(ndifreq.ifname)) == 0) {
109 warn("if_nametoindex(%s)", ndifreq.ifname);
110 return;
111 }
112
113 ndifreq.ifindex = ifindex;
114 error = ioctl_ctx(ctx, SIOCSDEFIFACE_IN6, (caddr_t)&ndifreq);
115 if (error)
116 warn("ioctl(SIOCSDEFIFACE_IN6)");
117 }
118
119 static int
isnd6defif(if_ctx * ctx,int s)120 isnd6defif(if_ctx *ctx, int s)
121 {
122 struct in6_ndifreq ndifreq = {};
123 unsigned int ifindex;
124 int error;
125
126 strlcpy(ndifreq.ifname, ctx->ifname, sizeof(ndifreq.ifname));
127
128 ifindex = if_nametoindex(ndifreq.ifname);
129 error = ioctl(s, SIOCGDEFIFACE_IN6, (caddr_t)&ndifreq);
130 if (error) {
131 warn("ioctl(SIOCGDEFIFACE_IN6)");
132 return (error);
133 }
134 return (ndifreq.ifindex == ifindex);
135 }
136
137 void
nd6_status(if_ctx * ctx)138 nd6_status(if_ctx *ctx)
139 {
140 struct in6_ndireq nd = {};
141 int s6;
142 int error;
143 int isdefif;
144
145 strlcpy(nd.ifname, ctx->ifname, sizeof(nd.ifname));
146 if ((s6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
147 if (errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT)
148 warn("socket(AF_INET6, SOCK_DGRAM)");
149 return;
150 }
151 error = ioctl(s6, SIOCGIFINFO_IN6, &nd);
152 if (error) {
153 if (errno != EPFNOSUPPORT)
154 warn("ioctl(SIOCGIFINFO_IN6)");
155 close(s6);
156 return;
157 }
158 isdefif = isnd6defif(ctx, s6);
159 close(s6);
160 if (nd.ndi.flags == 0 && !isdefif)
161 return;
162 printb("\tnd6 options",
163 (unsigned int)(nd.ndi.flags | (isdefif << 15)), ND6BITS);
164 putchar('\n');
165 }
166