source: rtems-libbsd/freebsd/sbin/ifconfig/ifmedia.c @ e599318

/*      $NetBSD: ifconfig.c,v 1.34 1997/04/21 01:17:58 lukem Exp $      */
/* $FreeBSD$ */

/*
 * 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 <rtems/bsd/sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <rtems/bsd/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);

#define IFM_OPMODE(x) \
        ((x) & (IFM_IEEE80211_ADHOC | IFM_IEEE80211_HOSTAP | \
         IFM_IEEE80211_IBSS | IFM_IEEE80211_WDS | IFM_IEEE80211_MONITOR | \
         IFM_IEEE80211_MBSS))
#define IFM_IEEE80211_STA       0

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:
                        if (ifmr.ifm_status & IFM_ACTIVE) {
                                /* NB: only sta mode associates */
                                if (IFM_OPMODE(ifmr.ifm_active) == IFM_IEEE80211_STA)
                                        printf("associated");
                                else
                                        printf("running");
                        } 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 | IFM_OMASK);
        }

        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 > (int)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 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;
        }

        /*
         * 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) {
                                if (seen_option == 0)
                                        printf(" mediaopt ");
                                printf("%s%s", seen_option++ ? "," : "",
                                    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]))
        size_t i;

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