sbin/ifconfig/vlan.c

   1 /*      $NetBSD: vlan.c,v 1.14 2014/09/15 06:46:04 ozaki-r 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 1.14 2014/09/15 06:46:04 ozaki-r 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
  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
  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
 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
 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_cstring_nocopy(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
 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
 176 vlan_usage(prop_dictionary_t env)
 177 {
 178         fprintf(stderr, "\t[ vlan n vlanif i ] [ -vlanif i ]\n");
 179 }
 180
 181 static 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 }