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ifmedia.c

/*    $NetBSD: ifconfig.c,v 1.34 1997/04/21 01:17:58 lukem Exp $  */
/* $FreeBSD: src/sbin/ifconfig/ifmedia.c,v 1.25.6.1 2008/11/25 02:59:29 kensmith Exp $ */

/*
 * Copyright (c) 1997 Jason R. Thorpe.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed for the NetBSD Project
 *    by Jason R. Thorpe.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Copyright (c) 1983, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/time.h>

#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/if_media.h>
#include <net/route.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "ifconfig.h"

static void domediaopt(const char *, int, int);
static int  get_media_subtype(int, const char *);
static int  get_media_mode(int, const char *);
static int  get_media_options(int, const char *);
static int  lookup_media_word(struct ifmedia_description *, const char *);
static void print_media_word(int, int);
static void print_media_word_ifconfig(int);

static struct ifmedia_description *get_toptype_desc(int);
static struct ifmedia_type_to_subtype *get_toptype_ttos(int);
static struct ifmedia_description *get_subtype_desc(int,
    struct ifmedia_type_to_subtype *ttos);

static void
media_status(int s)
{
      struct ifmediareq ifmr;
      int *media_list, i;

      (void) memset(&ifmr, 0, sizeof(ifmr));
      (void) strncpy(ifmr.ifm_name, name, sizeof(ifmr.ifm_name));

      if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
            /*
             * Interface doesn't support SIOC{G,S}IFMEDIA.
             */
            return;
      }

      if (ifmr.ifm_count == 0) {
            warnx("%s: no media types?", name);
            return;
      }

      media_list = (int *)malloc(ifmr.ifm_count * sizeof(int));
      if (media_list == NULL)
            err(1, "malloc");
      ifmr.ifm_ulist = media_list;

      if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0)
            err(1, "SIOCGIFMEDIA");

      printf("\tmedia: ");
      print_media_word(ifmr.ifm_current, 1);
      if (ifmr.ifm_active != ifmr.ifm_current) {
            putchar(' ');
            putchar('(');
            print_media_word(ifmr.ifm_active, 0);
            putchar(')');
      }

      putchar('\n');

      if (ifmr.ifm_status & IFM_AVALID) {
            printf("\tstatus: ");
            switch (IFM_TYPE(ifmr.ifm_active)) {
            case IFM_ETHER:
            case IFM_ATM:
                  if (ifmr.ifm_status & IFM_ACTIVE)
                        printf("active");
                  else
                        printf("no carrier");
                  break;

            case IFM_FDDI:
            case IFM_TOKEN:
                  if (ifmr.ifm_status & IFM_ACTIVE)
                        printf("inserted");
                  else
                        printf("no ring");
                  break;

            case IFM_IEEE80211:
                  /* XXX: Different value for adhoc? */
                  if (ifmr.ifm_status & IFM_ACTIVE)
                        printf("associated");
                  else
                        printf("no carrier");
                  break;
            }
            putchar('\n');
      }

      if (ifmr.ifm_count > 0 && supmedia) {
            printf("\tsupported media:\n");
            for (i = 0; i < ifmr.ifm_count; i++) {
                  printf("\t\t");
                  print_media_word_ifconfig(media_list[i]);
                  putchar('\n');
            }
      }

      free(media_list);
}

struct ifmediareq *
ifmedia_getstate(int s)
{
      static struct ifmediareq *ifmr = NULL;
      int *mwords;

      if (ifmr == NULL) {
            ifmr = (struct ifmediareq *)malloc(sizeof(struct ifmediareq));
            if (ifmr == NULL)
                  err(1, "malloc");

            (void) memset(ifmr, 0, sizeof(struct ifmediareq));
            (void) strncpy(ifmr->ifm_name, name,
                sizeof(ifmr->ifm_name));

            ifmr->ifm_count = 0;
            ifmr->ifm_ulist = NULL;

            /*
             * We must go through the motions of reading all
             * supported media because we need to know both
             * the current media type and the top-level type.
             */

            if (ioctl(s, SIOCGIFMEDIA, (caddr_t)ifmr) < 0) {
                  err(1, "SIOCGIFMEDIA");
            }

            if (ifmr->ifm_count == 0)
                  errx(1, "%s: no media types?", name);

            mwords = (int *)malloc(ifmr->ifm_count * sizeof(int));
            if (mwords == NULL)
                  err(1, "malloc");
  
            ifmr->ifm_ulist = mwords;
            if (ioctl(s, SIOCGIFMEDIA, (caddr_t)ifmr) < 0)
                  err(1, "SIOCGIFMEDIA");
      }

      return ifmr;
}

static void
setifmediacallback(int s, void *arg)
{
      struct ifmediareq *ifmr = (struct ifmediareq *)arg;
      static int did_it = 0;

      if (!did_it) {
            ifr.ifr_media = ifmr->ifm_current;
            if (ioctl(s, SIOCSIFMEDIA, (caddr_t)&ifr) < 0)
                  err(1, "SIOCSIFMEDIA (media)");
            free(ifmr->ifm_ulist);
            free(ifmr);
            did_it = 1;
      }
}

static void
setmedia(const char *val, int d, int s, const struct afswtch *afp)
{
      struct ifmediareq *ifmr;
      int subtype;

      ifmr = ifmedia_getstate(s);

      /*
       * We are primarily concerned with the top-level type.
       * However, "current" may be only IFM_NONE, so we just look
       * for the top-level type in the first "supported type"
       * entry.
       *
       * (I'm assuming that all supported media types for a given
       * interface will be the same top-level type..)
       */
      subtype = get_media_subtype(IFM_TYPE(ifmr->ifm_ulist[0]), val);

      strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
      ifr.ifr_media = (ifmr->ifm_current & ~(IFM_NMASK|IFM_TMASK)) |
          IFM_TYPE(ifmr->ifm_ulist[0]) | subtype;

      if ((ifr.ifr_media & IFM_TMASK) == 0) {
            ifr.ifr_media &= ~IFM_GMASK;
      }

      ifmr->ifm_current = ifr.ifr_media;
      callback_register(setifmediacallback, (void *)ifmr);
}

static void
setmediaopt(const char *val, int d, int s, const struct afswtch *afp)
{

      domediaopt(val, 0, s);
}

static void
unsetmediaopt(const char *val, int d, int s, const struct afswtch *afp)
{

      domediaopt(val, 1, s);
}

static void
domediaopt(const char *val, int clear, int s)
{
      struct ifmediareq *ifmr;
      int options;

      ifmr = ifmedia_getstate(s);

      options = get_media_options(IFM_TYPE(ifmr->ifm_ulist[0]), val);

      strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
      ifr.ifr_media = ifmr->ifm_current;
      if (clear)
            ifr.ifr_media &= ~options;
      else {
            if (options & IFM_HDX) {
                  ifr.ifr_media &= ~IFM_FDX;
                  options &= ~IFM_HDX;
            }
            ifr.ifr_media |= options;
      }
      ifmr->ifm_current = ifr.ifr_media;
      callback_register(setifmediacallback, (void *)ifmr);
}

static void
setmediainst(const char *val, int d, int s, const struct afswtch *afp)
{
      struct ifmediareq *ifmr;
      int inst;

      ifmr = ifmedia_getstate(s);

      inst = atoi(val);
      if (inst < 0 || inst > IFM_INST_MAX)
            errx(1, "invalid media instance: %s", val);

      strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
      ifr.ifr_media = (ifmr->ifm_current & ~IFM_IMASK) | inst << IFM_ISHIFT;

      ifmr->ifm_current = ifr.ifr_media;
      callback_register(setifmediacallback, (void *)ifmr);
}

static void
setmediamode(const char *val, int d, int s, const struct afswtch *afp)
{
      struct ifmediareq *ifmr;
      int mode;

      ifmr = ifmedia_getstate(s);

      mode = get_media_mode(IFM_TYPE(ifmr->ifm_ulist[0]), val);

      strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
      ifr.ifr_media = (ifmr->ifm_current & ~IFM_MMASK) | mode;

      ifmr->ifm_current = ifr.ifr_media;
      callback_register(setifmediacallback, (void *)ifmr);
}

/**********************************************************************
 * A good chunk of this is duplicated from sys/net/ifmedia.c
 **********************************************************************/

static struct ifmedia_description ifm_type_descriptions[] =
    IFM_TYPE_DESCRIPTIONS;

static struct ifmedia_description ifm_subtype_ethernet_descriptions[] =
    IFM_SUBTYPE_ETHERNET_DESCRIPTIONS;

static struct ifmedia_description ifm_subtype_ethernet_aliases[] =
    IFM_SUBTYPE_ETHERNET_ALIASES;

static struct ifmedia_description ifm_subtype_ethernet_option_descriptions[] =
    IFM_SUBTYPE_ETHERNET_OPTION_DESCRIPTIONS;

static struct ifmedia_description ifm_subtype_tokenring_descriptions[] =
    IFM_SUBTYPE_TOKENRING_DESCRIPTIONS;

static struct ifmedia_description ifm_subtype_tokenring_aliases[] =
    IFM_SUBTYPE_TOKENRING_ALIASES;

static struct ifmedia_description ifm_subtype_tokenring_option_descriptions[] =
    IFM_SUBTYPE_TOKENRING_OPTION_DESCRIPTIONS;

static struct ifmedia_description ifm_subtype_fddi_descriptions[] =
    IFM_SUBTYPE_FDDI_DESCRIPTIONS;

static struct ifmedia_description ifm_subtype_fddi_aliases[] =
    IFM_SUBTYPE_FDDI_ALIASES;

static struct ifmedia_description ifm_subtype_fddi_option_descriptions[] =
    IFM_SUBTYPE_FDDI_OPTION_DESCRIPTIONS;

static struct ifmedia_description ifm_subtype_ieee80211_descriptions[] =
    IFM_SUBTYPE_IEEE80211_DESCRIPTIONS;

static struct ifmedia_description ifm_subtype_ieee80211_aliases[] =
    IFM_SUBTYPE_IEEE80211_ALIASES;

static struct ifmedia_description ifm_subtype_ieee80211_option_descriptions[] =
    IFM_SUBTYPE_IEEE80211_OPTION_DESCRIPTIONS;

struct ifmedia_description ifm_subtype_ieee80211_mode_descriptions[] =
    IFM_SUBTYPE_IEEE80211_MODE_DESCRIPTIONS;

struct ifmedia_description ifm_subtype_ieee80211_mode_aliases[] =
    IFM_SUBTYPE_IEEE80211_MODE_ALIASES;

static struct ifmedia_description ifm_subtype_atm_descriptions[] =
    IFM_SUBTYPE_ATM_DESCRIPTIONS;

static struct ifmedia_description ifm_subtype_atm_aliases[] =
    IFM_SUBTYPE_ATM_ALIASES;

static struct ifmedia_description ifm_subtype_atm_option_descriptions[] =
    IFM_SUBTYPE_ATM_OPTION_DESCRIPTIONS;

static struct ifmedia_description ifm_subtype_shared_descriptions[] =
    IFM_SUBTYPE_SHARED_DESCRIPTIONS;

static struct ifmedia_description ifm_subtype_shared_aliases[] =
    IFM_SUBTYPE_SHARED_ALIASES;

static struct ifmedia_description ifm_shared_option_descriptions[] =
    IFM_SHARED_OPTION_DESCRIPTIONS;

struct ifmedia_type_to_subtype {
      struct {
            struct ifmedia_description *desc;
            int alias;
      } subtypes[5];
      struct {
            struct ifmedia_description *desc;
            int alias;
      } options[3];
      struct {
            struct ifmedia_description *desc;
            int alias;
      } modes[3];
};

/* must be in the same order as IFM_TYPE_DESCRIPTIONS */
static struct ifmedia_type_to_subtype ifmedia_types_to_subtypes[] = {
      {
            {
                  { &ifm_subtype_shared_descriptions[0], 0 },
                  { &ifm_subtype_shared_aliases[0], 1 },
                  { &ifm_subtype_ethernet_descriptions[0], 0 },
                  { &ifm_subtype_ethernet_aliases[0], 1 },
                  { NULL, 0 },
            },
            {
                  { &ifm_shared_option_descriptions[0], 0 },
                  { &ifm_subtype_ethernet_option_descriptions[0], 0 },
                  { NULL, 0 },
            },
            {
                  { NULL, 0 },
            },
      },
      {
            {
                  { &ifm_subtype_shared_descriptions[0], 0 },
                  { &ifm_subtype_shared_aliases[0], 1 },
                  { &ifm_subtype_tokenring_descriptions[0], 0 },
                  { &ifm_subtype_tokenring_aliases[0], 1 },
                  { NULL, 0 },
            },
            {
                  { &ifm_shared_option_descriptions[0], 0 },
                  { &ifm_subtype_tokenring_option_descriptions[0], 0 },
                  { NULL, 0 },
            },
            {
                  { NULL, 0 },
            },
      },
      {
            {
                  { &ifm_subtype_shared_descriptions[0], 0 },
                  { &ifm_subtype_shared_aliases[0], 1 },
                  { &ifm_subtype_fddi_descriptions[0], 0 },
                  { &ifm_subtype_fddi_aliases[0], 1 },
                  { NULL, 0 },
            },
            {
                  { &ifm_shared_option_descriptions[0], 0 },
                  { &ifm_subtype_fddi_option_descriptions[0], 0 },
                  { NULL, 0 },
            },
            {
                  { NULL, 0 },
            },
      },
      {
            {
                  { &ifm_subtype_shared_descriptions[0], 0 },
                  { &ifm_subtype_shared_aliases[0], 1 },
                  { &ifm_subtype_ieee80211_descriptions[0], 0 },
                  { &ifm_subtype_ieee80211_aliases[0], 1 },
                  { NULL, 0 },
            },
            {
                  { &ifm_shared_option_descriptions[0], 0 },
                  { &ifm_subtype_ieee80211_option_descriptions[0], 0 },
                  { NULL, 0 },
            },
            {
                  { &ifm_subtype_ieee80211_mode_descriptions[0], 0 },
                  { &ifm_subtype_ieee80211_mode_aliases[0], 0 },
                  { NULL, 0 },
            },
      },
      {
            {
                  { &ifm_subtype_shared_descriptions[0], 0 },
                  { &ifm_subtype_shared_aliases[0], 1 },
                  { &ifm_subtype_atm_descriptions[0], 0 },
                  { &ifm_subtype_atm_aliases[0], 1 },
                  { NULL, 0 },
            },
            {
                  { &ifm_shared_option_descriptions[0], 0 },
                  { &ifm_subtype_atm_option_descriptions[0], 0 },
                  { NULL, 0 },
            },
            {
                  { NULL, 0 },
            },
      },
};

static int
get_media_subtype(int type, const char *val)
{
      struct ifmedia_description *desc;
      struct ifmedia_type_to_subtype *ttos;
      int rval, i;

      /* Find the top-level interface type. */
      for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes;
          desc->ifmt_string != NULL; desc++, ttos++)
            if (type == desc->ifmt_word)
                  break;
      if (desc->ifmt_string == NULL)
            errx(1, "unknown media type 0x%x", type);

      for (i = 0; ttos->subtypes[i].desc != NULL; i++) {
            rval = lookup_media_word(ttos->subtypes[i].desc, val);
            if (rval != -1)
                  return (rval);
      }
      errx(1, "unknown media subtype: %s", val);
      /*NOTREACHED*/
}

static int
get_media_mode(int type, const char *val)
{
      struct ifmedia_description *desc;
      struct ifmedia_type_to_subtype *ttos;
      int rval, i;

      /* Find the top-level interface type. */
      for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes;
          desc->ifmt_string != NULL; desc++, ttos++)
            if (type == desc->ifmt_word)
                  break;
      if (desc->ifmt_string == NULL)
            errx(1, "unknown media mode 0x%x", type);

      for (i = 0; ttos->modes[i].desc != NULL; i++) {
            rval = lookup_media_word(ttos->modes[i].desc, val);
            if (rval != -1)
                  return (rval);
      }
      return -1;
}

static int
get_media_options(int type, const char *val)
{
      struct ifmedia_description *desc;
      struct ifmedia_type_to_subtype *ttos;
      char *optlist, *optptr;
      int option = 0, i, rval = 0;

      /* We muck with the string, so copy it. */
      optlist = strdup(val);
      if (optlist == NULL)
            err(1, "strdup");

      /* Find the top-level interface type. */
      for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes;
          desc->ifmt_string != NULL; desc++, ttos++)
            if (type == desc->ifmt_word)
                  break;
      if (desc->ifmt_string == NULL)
            errx(1, "unknown media type 0x%x", type);

      /*
       * Look up the options in the user-provided comma-separated
       * list.
       */
      optptr = optlist;
      for (; (optptr = strtok(optptr, ",")) != NULL; optptr = NULL) {
            for (i = 0; ttos->options[i].desc != NULL; i++) {
                  option = lookup_media_word(ttos->options[i].desc, optptr);
                  if (option != -1)
                        break;
            }
            if (option == 0)
                  errx(1, "unknown option: %s", optptr);
            rval |= option;
      }

      free(optlist);
      return (rval);
}

static int
lookup_media_word(struct ifmedia_description *desc, const char *val)
{

      for (; desc->ifmt_string != NULL; desc++)
            if (strcasecmp(desc->ifmt_string, val) == 0)
                  return (desc->ifmt_word);

      return (-1);
}

static struct ifmedia_description *get_toptype_desc(int ifmw)
{
      struct ifmedia_description *desc;

      for (desc = ifm_type_descriptions; desc->ifmt_string != NULL; desc++)
            if (IFM_TYPE(ifmw) == desc->ifmt_word)
                  break;

      return desc;
}

static struct ifmedia_type_to_subtype *get_toptype_ttos(int ifmw)
{
      struct ifmedia_description *desc;
      struct ifmedia_type_to_subtype *ttos;

      for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes;
          desc->ifmt_string != NULL; desc++, ttos++)
            if (IFM_TYPE(ifmw) == desc->ifmt_word)
                  break;

      return ttos;
}

static struct ifmedia_description *get_subtype_desc(int ifmw, 
    struct ifmedia_type_to_subtype *ttos)
{
      int i;
      struct ifmedia_description *desc;

      for (i = 0; ttos->subtypes[i].desc != NULL; i++) {
            if (ttos->subtypes[i].alias)
                  continue;
            for (desc = ttos->subtypes[i].desc;
                desc->ifmt_string != NULL; desc++) {
                  if (IFM_SUBTYPE(ifmw) == desc->ifmt_word)
                        return desc;
            }
      }

      return NULL;
}

static struct ifmedia_description *get_mode_desc(int ifmw, 
    struct ifmedia_type_to_subtype *ttos)
{
      int i;
      struct ifmedia_description *desc;

      for (i = 0; ttos->modes[i].desc != NULL; i++) {
            if (ttos->modes[i].alias)
                  continue;
            for (desc = ttos->modes[i].desc;
                desc->ifmt_string != NULL; desc++) {
                  if (IFM_MODE(ifmw) == desc->ifmt_word)
                        return desc;
            }
      }

      return NULL;
}

static void
print_media_word(int ifmw, int print_toptype)
{
      struct ifmedia_description *desc;
      struct ifmedia_type_to_subtype *ttos;
      int seen_option = 0, i;

      /* Find the top-level interface type. */
      desc = get_toptype_desc(ifmw);
      ttos = get_toptype_ttos(ifmw);
      if (desc->ifmt_string == NULL) {
            printf("<unknown type>");
            return;
      } else if (print_toptype) {
            printf("%s", desc->ifmt_string);
      }

      /*
       * Don't print the top-level type; it's not like we can
       * change it, or anything.
       */

      /* Find subtype. */
      desc = get_subtype_desc(ifmw, ttos);
      if (desc == NULL) {
            printf("<unknown subtype>");
            return;
      }

      if (print_toptype)
            putchar(' ');

      printf("%s", desc->ifmt_string);

      if (print_toptype) {
            desc = get_mode_desc(ifmw, ttos);
            if (desc != NULL && strcasecmp("autoselect", desc->ifmt_string))
                  printf(" mode %s", desc->ifmt_string);
      }

      /* Find options. */
      for (i = 0; ttos->options[i].desc != NULL; i++) {
            if (ttos->options[i].alias)
                  continue;
            for (desc = ttos->options[i].desc;
                desc->ifmt_string != NULL; desc++) {
                  if (ifmw & desc->ifmt_word) {
                        if (seen_option == 0)
                              printf(" <");
                        printf("%s%s", seen_option++ ? "," : "",
                            desc->ifmt_string);
                  }
            }
      }
      printf("%s", seen_option ? ">" : "");

      if (print_toptype && IFM_INST(ifmw) != 0)
            printf(" instance %d", IFM_INST(ifmw));
}

static void
print_media_word_ifconfig(int ifmw)
{
      struct ifmedia_description *desc;
      struct ifmedia_type_to_subtype *ttos;
      int i;

      /* Find the top-level interface type. */
      desc = get_toptype_desc(ifmw);
      ttos = get_toptype_ttos(ifmw);
      if (desc->ifmt_string == NULL) {
            printf("<unknown type>");
            return;
      }

      /*
       * Don't print the top-level type; it's not like we can
       * change it, or anything.
       */

      /* Find subtype. */
      desc = get_subtype_desc(ifmw, ttos);
      if (desc == NULL) {
            printf("<unknown subtype>");
            return;
      }

      printf("media %s", desc->ifmt_string);

      desc = get_mode_desc(ifmw, ttos);
      if (desc != NULL)
            printf(" mode %s", desc->ifmt_string);

      /* Find options. */
      for (i = 0; ttos->options[i].desc != NULL; i++) {
            if (ttos->options[i].alias)
                  continue;
            for (desc = ttos->options[i].desc;
                desc->ifmt_string != NULL; desc++) {
                  if (ifmw & desc->ifmt_word) {
                        printf(" mediaopt %s", desc->ifmt_string);
                  }
            }
      }

      if (IFM_INST(ifmw) != 0)
            printf(" instance %d", IFM_INST(ifmw));
}

/**********************************************************************
 * ...until here.
 **********************************************************************/

static struct cmd media_cmds[] = {
      DEF_CMD_ARG("media",    setmedia),
      DEF_CMD_ARG("mode",     setmediamode),
      DEF_CMD_ARG("mediaopt", setmediaopt),
      DEF_CMD_ARG("-mediaopt",unsetmediaopt),
      DEF_CMD_ARG("inst",     setmediainst),
      DEF_CMD_ARG("instance", setmediainst),
};
static struct afswtch af_media = {
      .af_name    = "af_media",
      .af_af            = AF_UNSPEC,
      .af_other_status = media_status,
};

static __constructor void
ifmedia_ctor(void)
{
#define     N(a)  (sizeof(a) / sizeof(a[0]))
      int i;

      for (i = 0; i < N(media_cmds);  i++)
            cmd_register(&media_cmds[i]);
      af_register(&af_media);
#undef N
}

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