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vlan.c revision 1.6 
      1 /*	$NetBSD: vlan.c,v 1.6 2008/05/06 18:58:47 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 1.6 2008/05/06 18:58:47 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 
     56 struct pinteger vlan = PINTEGER_INITIALIZER1(&vlan, "vlan", 0, USHRT_MAX, 10,
     57     setvlan, "vlan", &command_root.pb_parser);
     58 
     59 struct piface vlanif = PIFACE_INITIALIZER(&vlanif, "vlanif", setvlanif,
     60     "vlanif", &command_root.pb_parser);
     61 
     62 static int
     63 checkifname(const char *ifname)
     64 {
     65 
     66 	return strncmp(ifname, "vlan", 4) != 0 ||
     67 	    !isdigit((unsigned char)ifname[4]);
     68 }
     69 
     70 static int
     71 getvlan(prop_dictionary_t env, struct ifreq *ifr, struct vlanreq *vlr,
     72     bool quiet)
     73 {
     74 	int s;
     75 	const char *ifname;
     76 
     77 	if ((s = getsock(AF_UNSPEC)) == -1)
     78 		err(EXIT_FAILURE, "%s: getsock", __func__);
     79 	if ((ifname = getifname(env)) == NULL)
     80 		err(EXIT_FAILURE, "%s: getifname", __func__);
     81 
     82 	memset(ifr, 0, sizeof(*ifr));
     83 	memset(vlr, 0, sizeof(*vlr));
     84 
     85 	if (checkifname(ifname)) {
     86 		if (quiet)
     87 			return -1;
     88 		errx(EXIT_FAILURE, "valid only with vlan(4) interfaces");
     89 	}
     90 
     91 	estrlcpy(ifr->ifr_name, ifname, sizeof(ifr->ifr_name));
     92 	ifr->ifr_data = vlr;
     93 
     94 	if (ioctl(s, SIOCGETVLAN, ifr) == -1)
     95 		return -1;
     96 
     97 	return s;
     98 }
     99 
    100 int
    101 setvlan(prop_dictionary_t env, prop_dictionary_t xenv)
    102 {
    103 	struct vlanreq vlr;
    104 	int s;
    105 	int64_t tag;
    106 	struct ifreq ifr;
    107 
    108 	if ((s = getvlan(env, &ifr, &vlr, false)) == -1)
    109 		err(EXIT_FAILURE, "%s: getvlan", __func__);
    110 
    111 	if (!prop_dictionary_get_int64(env, "vlantag", &tag)) {
    112 		errno = ENOENT;
    113 		return -1;
    114 	}
    115 
    116 	vlr.vlr_tag = tag;
    117 
    118 	if (ioctl(s, SIOCSETVLAN, &ifr) == -1)
    119 		err(EXIT_FAILURE, "SIOCSETVLAN");
    120 	return 0;
    121 }
    122 
    123 int
    124 setvlanif(prop_dictionary_t env, prop_dictionary_t xenv)
    125 {
    126 	struct vlanreq vlr;
    127 	int s;
    128 	const char *parent;
    129 	int64_t tag;
    130 	struct ifreq ifr;
    131 
    132 	if ((s = getvlan(env, &ifr, &vlr, false)) == -1)
    133 		err(EXIT_FAILURE, "%s: getsock", __func__);
    134 
    135 	if (!prop_dictionary_get_int64(env, "vlantag", &tag)) {
    136 		errno = ENOENT;
    137 		return -1;
    138 	}
    139 
    140 	if (!prop_dictionary_get_cstring_nocopy(env, "vlanif", &parent)) {
    141 		errno = ENOENT;
    142 		return -1;
    143 	}
    144 	strlcpy(vlr.vlr_parent, parent, sizeof(vlr.vlr_parent));
    145 	if (strcmp(parent, "") != 0)
    146 		vlr.vlr_tag = (unsigned short)tag;
    147 
    148 	if (ioctl(s, SIOCSETVLAN, &ifr) == -1)
    149 		err(EXIT_FAILURE, "SIOCSETVLAN");
    150 	return 0;
    151 }
    152 
    153 void
    154 vlan_status(prop_dictionary_t env, prop_dictionary_t oenv)
    155 {
    156 	struct vlanreq vlr;
    157 	int s;
    158 	struct ifreq ifr;
    159 
    160 	if ((s = getvlan(env, &ifr, &vlr, true)) == -1)
    161 		return;
    162 
    163 	if (vlr.vlr_tag || vlr.vlr_parent[0] != '\0')
    164 		printf("\tvlan: %d parent: %s\n",
    165 		    vlr.vlr_tag, vlr.vlr_parent[0] == '\0' ?
    166 		    "<none>" : vlr.vlr_parent);
    167 }
    168