1 /* $NetBSD: vlan.c,v 1.16 2021/06/21 03:14:40 christos Exp $ */
2
3 /*
4 * Copyright (c) 1983, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #ifndef lint
34 __RCSID("$NetBSD: vlan.c,v 1.16 2021/06/21 03:14:40 christos Exp $");
35 #endif /* not lint */
36
37 #include <sys/param.h>
38 #include <sys/ioctl.h>
39
40 #include <net/if.h>
41 #include <net/if_ether.h>
42 #include <net/if_vlanvar.h>
43
44 #include <ctype.h>
45 #include <err.h>
46 #include <errno.h>
47 #include <string.h>
48 #include <stdlib.h>
49 #include <stdio.h>
50 #include <util.h>
51
52 #include "env.h"
53 #include "extern.h"
54 #include "util.h"
55
56 static status_func_t status;
57 static usage_func_t usage;
58 static cmdloop_branch_t branch;
59
60 static void vlan_constructor(void) __attribute__((constructor));
61 static void vlan_status(prop_dictionary_t, prop_dictionary_t);
62
63 static int setvlan(prop_dictionary_t, prop_dictionary_t);
64 static int setvlanif(prop_dictionary_t, prop_dictionary_t);
65
66 struct pinteger vlantag = PINTEGER_INITIALIZER1(&vlantag, "VLAN tag",
67 0, USHRT_MAX, 10, setvlan, "vlantag", &command_root.pb_parser);
68
69 struct piface vlanif = PIFACE_INITIALIZER(&vlanif, "vlanif", setvlanif,
70 "vlanif", &command_root.pb_parser);
71
72 static const struct kwinst vlankw[] = {
73 {.k_word = "vlan", .k_nextparser = &vlantag.pi_parser}
74 , {.k_word = "vlanif", .k_act = "vlantag",
75 .k_nextparser = &vlanif.pif_parser}
76 , {.k_word = "-vlanif", .k_key = "vlanif", .k_type = KW_T_STR,
77 .k_str = "", .k_exec = setvlanif}
78 };
79
80 struct pkw vlan = PKW_INITIALIZER(&vlan, "vlan", NULL, NULL,
81 vlankw, __arraycount(vlankw), NULL);
82
83 static int
checkifname(prop_dictionary_t env)84 checkifname(prop_dictionary_t env)
85 {
86 const char *ifname;
87
88 if ((ifname = getifname(env)) == NULL)
89 return 1;
90
91 return strncmp(ifname, "vlan", 4) != 0 ||
92 !isdigit((unsigned char)ifname[4]);
93 }
94
95 static int
getvlan(prop_dictionary_t env,struct vlanreq * vlr,bool quiet)96 getvlan(prop_dictionary_t env, struct vlanreq *vlr, bool quiet)
97 {
98 memset(vlr, 0, sizeof(*vlr));
99
100 if (checkifname(env)) {
101 if (quiet)
102 return -1;
103 errx(EXIT_FAILURE, "valid only with vlan(4) interfaces");
104 }
105
106 if (indirect_ioctl(env, SIOCGETVLAN, vlr) == -1)
107 return -1;
108
109 return 0;
110 }
111
112 int
setvlan(prop_dictionary_t env,prop_dictionary_t oenv)113 setvlan(prop_dictionary_t env, prop_dictionary_t oenv)
114 {
115 struct vlanreq vlr;
116 int64_t tag;
117
118 if (getvlan(env, &vlr, false) == -1)
119 err(EXIT_FAILURE, "%s: getvlan", __func__);
120
121 if (!prop_dictionary_get_int64(env, "vlantag", &tag)) {
122 errno = ENOENT;
123 return -1;
124 }
125
126 vlr.vlr_tag = tag;
127
128 if (indirect_ioctl(env, SIOCSETVLAN, &vlr) == -1)
129 err(EXIT_FAILURE, "SIOCSETVLAN");
130 return 0;
131 }
132
133 int
setvlanif(prop_dictionary_t env,prop_dictionary_t oenv)134 setvlanif(prop_dictionary_t env, prop_dictionary_t oenv)
135 {
136 struct vlanreq vlr;
137 const char *parent;
138 int64_t tag;
139
140 if (getvlan(env, &vlr, false) == -1)
141 err(EXIT_FAILURE, "%s: getsock", __func__);
142
143 if (!prop_dictionary_get_string(env, "vlanif", &parent)) {
144 errno = ENOENT;
145 return -1;
146 }
147 strlcpy(vlr.vlr_parent, parent, sizeof(vlr.vlr_parent));
148 if (strcmp(parent, "") == 0)
149 ;
150 else if (!prop_dictionary_get_int64(env, "vlantag", &tag)) {
151 errno = ENOENT;
152 return -1;
153 } else
154 vlr.vlr_tag = (unsigned short)tag;
155
156 if (indirect_ioctl(env, SIOCSETVLAN, &vlr) == -1)
157 err(EXIT_FAILURE, "SIOCSETVLAN");
158 return 0;
159 }
160
161 static void
vlan_status(prop_dictionary_t env,prop_dictionary_t oenv)162 vlan_status(prop_dictionary_t env, prop_dictionary_t oenv)
163 {
164 struct vlanreq vlr;
165
166 if (getvlan(env, &vlr, true) == -1)
167 return;
168
169 if (vlr.vlr_tag || vlr.vlr_parent[0] != '\0')
170 printf("\tvlan: %d parent: %s\n",
171 vlr.vlr_tag, vlr.vlr_parent[0] == '\0' ?
172 "<none>" : vlr.vlr_parent);
173 }
174
175 static void
vlan_usage(prop_dictionary_t env)176 vlan_usage(prop_dictionary_t env)
177 {
178 fprintf(stderr, "\t[ vlan n vlanif i ] [ -vlanif i ]\n");
179 }
180
181 static void
vlan_constructor(void)182 vlan_constructor(void)
183 {
184 cmdloop_branch_init(&branch, &vlan.pk_parser);
185 register_cmdloop_branch(&branch);
186 status_func_init(&status, vlan_status);
187 usage_func_init(&usage, vlan_usage);
188 register_status(&status);
189 register_usage(&usage);
190 }
191