sbin/ifconfig/ifvlan.c

   1 /*
   2  * Copyright (c) 1999
   3  *      Bill Paul <wpaul@ctr.columbia.edu>.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by Bill Paul.
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD
  24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  * $FreeBSD: src/sbin/ifconfig/ifvlan.c,v 1.7.2.4 2006/02/09 10:48:43 yar Exp $
  33  * $DragonFly: src/sbin/ifconfig/ifvlan.c,v 1.8 2006/04/02 03:33:59 sephe Exp $
  34  */
  35
  36 #include <sys/param.h>
  37 #include <sys/ioctl.h>
  38 #include <sys/socket.h>
  39 #include <sys/sockio.h>
  40
  41 #include <stdlib.h>
  42 #include <unistd.h>
  43
  44 #include <net/ethernet.h>
  45 #include <net/if.h>
  46 #include <net/if_var.h>
  47 #include <net/vlan/if_vlan_var.h>
  48 #include <net/route.h>
  49
  50 #include <ctype.h>
  51 #include <stdio.h>
  52 #include <string.h>
  53 #include <stdlib.h>
  54 #include <unistd.h>
  55 #include <err.h>
  56 #include <errno.h>
  57
  58 #include "ifconfig.h"
  59
  60 static struct vlanreq           __vreq;
  61 static int                      __have_dev = 0;
  62 static int                      __have_tag = 0;
  63
  64 static void
  65 vlan_status(int s)
  66 {
  67         struct vlanreq          vreq;
  68
  69         bzero((char *)&vreq, sizeof(vreq));
  70         ifr.ifr_data = (caddr_t)&vreq;
  71
  72         if (ioctl(s, SIOCGETVLAN, (caddr_t)&ifr) == -1)
  73                 return;
  74
  75         printf("\tvlan: %d parent interface: %s\n",
  76             vreq.vlr_tag, vreq.vlr_parent[0] == '\0' ?
  77             "<none>" : vreq.vlr_parent);
  78 }
  79
  80 static void
  81 setvlantag(const char *val, int d, int s, const struct afswtch  *afp)
  82 {
  83         char                    *endp;
  84         u_long                  ul;
  85
  86         ul = strtoul(val, &endp, 0);
  87         if (*endp != '\0')
  88                 errx(1, "invalid value for vlan");
  89         __vreq.vlr_tag = ul;
  90         /* check if the value can be represented in vlr_tag */
  91         if (__vreq.vlr_tag != ul)
  92                 errx(1, "value for vlan out of range");
  93         /* the kernel will do more specific checks on vlr_tag */
  94         __have_tag = 1;
  95 }
  96
  97 static void
  98 setvlandev(const char *val, int d, int s, const struct afswtch  *afp)
  99 {
 100
 101         strncpy(__vreq.vlr_parent, val, sizeof(__vreq.vlr_parent));
 102         __have_dev = 1;
 103 }
 104
 105 static void
 106 unsetvlandev(const char *val, int d, int s, const struct afswtch *afp)
 107 {
 108
 109         if (val != NULL)
 110                 warnx("argument to -vlandev is useless and hence deprecated");
 111
 112         bzero((char *)&__vreq, sizeof(__vreq));
 113         ifr.ifr_data = (caddr_t)&__vreq;
 114 #if 0   /* this code will be of use when we can alter vlan or vlandev only */
 115         if (ioctl(s, SIOCGETVLAN, (caddr_t)&ifr) == -1)
 116                 err(1, "SIOCGETVLAN");
 117
 118         bzero((char *)&__vreq.vlr_parent, sizeof(__vreq.vlr_parent));
 119         __vreq.vlr_tag = 0; /* XXX clear parent only (no kernel support now) */
 120 #endif
 121         if (ioctl(s, SIOCSETVLAN, (caddr_t)&ifr) == -1)
 122                 err(1, "SIOCSETVLAN");
 123         __have_dev = __have_tag = 0;
 124 }
 125
 126 static void
 127 vlan_cb(int s, void *arg)
 128 {
 129
 130         if (__have_tag ^ __have_dev)
 131                 errx(1, "both vlan and vlandev must be specified");
 132
 133         if (__have_tag && __have_dev) {
 134                 ifr.ifr_data = (caddr_t)&__vreq;
 135                 if (ioctl(s, SIOCSETVLAN, (caddr_t)&ifr) == -1)
 136                         err(1, "SIOCSETVLAN");
 137         }
 138 }
 139
 140 static struct cmd vlan_cmds[] = {
 141         DEF_CMD_ARG("vlan",                             setvlantag),
 142         DEF_CMD_ARG("vlandev",                          setvlandev),
 143         /* XXX For compatibility.  Should become DEF_CMD() some day. */
 144         DEF_CMD_OPTARG("-vlandev",                      unsetvlandev),
 145         DEF_CMD("vlanmtu",      IFCAP_VLAN_MTU,         setifcap),
 146         DEF_CMD("-vlanmtu",     -IFCAP_VLAN_MTU,        setifcap),
 147         DEF_CMD("vlanhwtag",    IFCAP_VLAN_HWTAGGING,   setifcap),
 148         DEF_CMD("-vlanhwtag",   -IFCAP_VLAN_HWTAGGING,  setifcap),
 149 };
 150 static struct afswtch af_vlan = {
 151         .af_name        = "af_vlan",
 152         .af_af          = AF_UNSPEC,
 153         .af_other_status = vlan_status,
 154 };
 155
 156 static __constructor void
 157 vlan_ctor(void)
 158 {
 159 #define N(a)    (sizeof(a) / sizeof(a[0]))
 160         int i;
 161
 162         for (i = 0; i < N(vlan_cmds);  i++)
 163                 cmd_register(&vlan_cmds[i]);
 164         af_register(&af_vlan);
 165         callback_register(vlan_cb, NULL);
 166 #undef N
 167 }