vlan.c revision 1.7 
1/*	$NetBSD: vlan.c,v 1.7 2008/05/07 20:11:15 dyoung 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 1.7 2008/05/07 20:11:15 dyoung 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 "vlan.h"
55
56struct pinteger vlantag = PINTEGER_INITIALIZER1(&vlantag, "VLAN tag",
57    0, USHRT_MAX, 10, setvlan, "vlantag", &command_root.pb_parser);
58
59struct piface vlanif = PIFACE_INITIALIZER(&vlanif, "vlanif", setvlanif,
60    "vlanif", &command_root.pb_parser);
61
62static const struct kwinst vlankw[] = {
63	  {.k_word = "vlan", .k_nextparser = &vlantag.pi_parser}
64	, {.k_word = "vlanif", .k_act = "vlan",
65	   .k_nextparser = &vlanif.pif_parser}
66	, {.k_word = "-vlanif", .k_key = "vlanif", .k_type = KW_T_STR,
67	   .k_str = "", .k_exec = setvlanif}
68};
69
70struct pkw vlan = PKW_INITIALIZER(&vlan, "vlan", NULL, NULL,
71    vlankw, __arraycount(vlankw), NULL);
72
73static int
74checkifname(const char *ifname)
75{
76
77	return strncmp(ifname, "vlan", 4) != 0 ||
78	    !isdigit((unsigned char)ifname[4]);
79}
80
81static int
82getvlan(prop_dictionary_t env, struct ifreq *ifr, struct vlanreq *vlr,
83    bool quiet)
84{
85	int s;
86	const char *ifname;
87
88	if ((s = getsock(AF_UNSPEC)) == -1)
89		err(EXIT_FAILURE, "%s: getsock", __func__);
90	if ((ifname = getifname(env)) == NULL)
91		err(EXIT_FAILURE, "%s: getifname", __func__);
92
93	memset(ifr, 0, sizeof(*ifr));
94	memset(vlr, 0, sizeof(*vlr));
95
96	if (checkifname(ifname)) {
97		if (quiet)
98			return -1;
99		errx(EXIT_FAILURE, "valid only with vlan(4) interfaces");
100	}
101
102	estrlcpy(ifr->ifr_name, ifname, sizeof(ifr->ifr_name));
103	ifr->ifr_data = vlr;
104
105	if (ioctl(s, SIOCGETVLAN, ifr) == -1)
106		return -1;
107
108	return s;
109}
110
111int
112setvlan(prop_dictionary_t env, prop_dictionary_t xenv)
113{
114	struct vlanreq vlr;
115	int s;
116	int64_t tag;
117	struct ifreq ifr;
118
119	if ((s = getvlan(env, &ifr, &vlr, false)) == -1)
120		err(EXIT_FAILURE, "%s: getvlan", __func__);
121
122	if (!prop_dictionary_get_int64(env, "vlantag", &tag)) {
123		errno = ENOENT;
124		return -1;
125	}
126
127	vlr.vlr_tag = tag;
128
129	if (ioctl(s, SIOCSETVLAN, &ifr) == -1)
130		err(EXIT_FAILURE, "SIOCSETVLAN");
131	return 0;
132}
133
134int
135setvlanif(prop_dictionary_t env, prop_dictionary_t xenv)
136{
137	struct vlanreq vlr;
138	int s;
139	const char *parent;
140	int64_t tag;
141	struct ifreq ifr;
142
143	if ((s = getvlan(env, &ifr, &vlr, false)) == -1)
144		err(EXIT_FAILURE, "%s: getsock", __func__);
145
146	if (!prop_dictionary_get_int64(env, "vlantag", &tag)) {
147		errno = ENOENT;
148		return -1;
149	}
150
151	if (!prop_dictionary_get_cstring_nocopy(env, "vlanif", &parent)) {
152		errno = ENOENT;
153		return -1;
154	}
155	strlcpy(vlr.vlr_parent, parent, sizeof(vlr.vlr_parent));
156	if (strcmp(parent, "") != 0)
157		vlr.vlr_tag = (unsigned short)tag;
158
159	if (ioctl(s, SIOCSETVLAN, &ifr) == -1)
160		err(EXIT_FAILURE, "SIOCSETVLAN");
161	return 0;
162}
163
164void
165vlan_status(prop_dictionary_t env, prop_dictionary_t oenv)
166{
167	struct vlanreq vlr;
168	int s;
169	struct ifreq ifr;
170
171	if ((s = getvlan(env, &ifr, &vlr, true)) == -1)
172		return;
173
174	if (vlr.vlr_tag || vlr.vlr_parent[0] != '\0')
175		printf("\tvlan: %d parent: %s\n",
176		    vlr.vlr_tag, vlr.vlr_parent[0] == '\0' ?
177		    "<none>" : vlr.vlr_parent);
178}
179