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/* $NetBSD: if_media.c,v 1.1 1997/03/17 02:55:15 thorpej Exp $ */
/* $FreeBSD: release/9.1.0/sys/net/if_media.c 218909 2011-02-21 09:01:34Z brucec $ */
/*-
* Copyright (c) 1997
* Jonathan Stone and Jason R. Thorpe. All rights reserved.
*
* This software is derived from information provided by Matt Thomas.
*
* 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 Jonathan Stone
* and Jason R. Thorpe for the NetBSD Project.
* 4. The names of the authors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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.
*/
/*
* BSD/OS-compatible network interface media selection.
*
* Where it is safe to do so, this code strays slightly from the BSD/OS
* design. Software which uses the API (device drivers, basically)
* shouldn't notice any difference.
*
* Many thanks to Matt Thomas for providing the information necessary
* to implement this interface.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_media.h>
/*
* Compile-time options:
* IFMEDIA_DEBUG:
* turn on implementation-level debug printfs.
* Useful for debugging newly-ported drivers.
*/
static struct ifmedia_entry *ifmedia_match(struct ifmedia *ifm,
int flags, int mask);
#ifdef IFMEDIA_DEBUG
int ifmedia_debug = 0;
SYSCTL_INT(_debug, OID_AUTO, ifmedia, CTLFLAG_RW, &ifmedia_debug,
0, "if_media debugging msgs");
static void ifmedia_printword(int);
#endif
/*
* Initialize if_media struct for a specific interface instance.
*/
void
ifmedia_init(ifm, dontcare_mask, change_callback, status_callback)
struct ifmedia *ifm;
int dontcare_mask;
ifm_change_cb_t change_callback;
ifm_stat_cb_t status_callback;
{
LIST_INIT(&ifm->ifm_list);
ifm->ifm_cur = NULL;
ifm->ifm_media = 0;
ifm->ifm_mask = dontcare_mask; /* IF don't-care bits */
ifm->ifm_change = change_callback;
ifm->ifm_status = status_callback;
}
void
ifmedia_removeall(ifm)
struct ifmedia *ifm;
{
struct ifmedia_entry *entry;
for (entry = LIST_FIRST(&ifm->ifm_list); entry;
entry = LIST_FIRST(&ifm->ifm_list)) {
LIST_REMOVE(entry, ifm_list);
free(entry, M_IFADDR);
}
}
/*
* Add a media configuration to the list of supported media
* for a specific interface instance.
*/
void
ifmedia_add(ifm, mword, data, aux)
struct ifmedia *ifm;
int mword;
int data;
void *aux;
{
register struct ifmedia_entry *entry;
#ifdef IFMEDIA_DEBUG
if (ifmedia_debug) {
if (ifm == NULL) {
printf("ifmedia_add: null ifm\n");
return;
}
printf("Adding entry for ");
ifmedia_printword(mword);
}
#endif
entry = malloc(sizeof(*entry), M_IFADDR, M_NOWAIT);
if (entry == NULL)
panic("ifmedia_add: can't malloc entry");
entry->ifm_media = mword;
entry->ifm_data = data;
entry->ifm_aux = aux;
LIST_INSERT_HEAD(&ifm->ifm_list, entry, ifm_list);
}
/*
* Add an array of media configurations to the list of
* supported media for a specific interface instance.
*/
void
ifmedia_list_add(ifm, lp, count)
struct ifmedia *ifm;
struct ifmedia_entry *lp;
int count;
{
int i;
for (i = 0; i < count; i++)
ifmedia_add(ifm, lp[i].ifm_media, lp[i].ifm_data,
lp[i].ifm_aux);
}
/*
* Set the default active media.
*
* Called by device-specific code which is assumed to have already
* selected the default media in hardware. We do _not_ call the
* media-change callback.
*/
void
ifmedia_set(ifm, target)
struct ifmedia *ifm;
int target;
{
struct ifmedia_entry *match;
match = ifmedia_match(ifm, target, ifm->ifm_mask);
if (match == NULL) {
printf("ifmedia_set: no match for 0x%x/0x%x\n",
target, ~ifm->ifm_mask);
panic("ifmedia_set");
}
ifm->ifm_cur = match;
#ifdef IFMEDIA_DEBUG
if (ifmedia_debug) {
printf("ifmedia_set: target ");
ifmedia_printword(target);
printf("ifmedia_set: setting to ");
ifmedia_printword(ifm->ifm_cur->ifm_media);
}
#endif
}
/*
* Device-independent media ioctl support function.
*/
int
ifmedia_ioctl(ifp, ifr, ifm, cmd)
struct ifnet *ifp;
struct ifreq *ifr;
struct ifmedia *ifm;
u_long cmd;
{
struct ifmedia_entry *match;
struct ifmediareq *ifmr = (struct ifmediareq *) ifr;
int error = 0, sticky;
if (ifp == NULL || ifr == NULL || ifm == NULL)
return(EINVAL);
switch (cmd) {
/*
* Set the current media.
*/
case SIOCSIFMEDIA:
{
struct ifmedia_entry *oldentry;
int oldmedia;
int newmedia = ifr->ifr_media;
match = ifmedia_match(ifm, newmedia, ifm->ifm_mask);
if (match == NULL) {
#ifdef IFMEDIA_DEBUG
if (ifmedia_debug) {
printf(
"ifmedia_ioctl: no media found for 0x%x\n",
newmedia);
}
#endif
return (ENXIO);
}
/*
* If no change, we're done.
* XXX Automedia may invole software intervention.
* Keep going in case the connected media changed.
* Similarly, if best match changed (kernel debugger?).
*/
if ((IFM_SUBTYPE(newmedia) != IFM_AUTO) &&
(newmedia == ifm->ifm_media) &&
(match == ifm->ifm_cur))
return 0;
/*
* We found a match, now make the driver switch to it.
* Make sure to preserve our old media type in case the
* driver can't switch.
*/
#ifdef IFMEDIA_DEBUG
if (ifmedia_debug) {
printf("ifmedia_ioctl: switching %s to ",
ifp->if_xname);
ifmedia_printword(match->ifm_media);
}
#endif
oldentry = ifm->ifm_cur;
oldmedia = ifm->ifm_media;
ifm->ifm_cur = match;
ifm->ifm_media = newmedia;
error = (*ifm->ifm_change)(ifp);
if (error) {
ifm->ifm_cur = oldentry;
ifm->ifm_media = oldmedia;
}
break;
}
/*
* Get list of available media and current media on interface.
*/
case SIOCGIFMEDIA:
{
struct ifmedia_entry *ep;
int *kptr, count;
int usermax; /* user requested max */
kptr = NULL; /* XXX gcc */
ifmr->ifm_active = ifmr->ifm_current = ifm->ifm_cur ?
ifm->ifm_cur->ifm_media : IFM_NONE;
ifmr->ifm_mask = ifm->ifm_mask;
ifmr->ifm_status = 0;
(*ifm->ifm_status)(ifp, ifmr);
count = 0;
usermax = 0;
/*
* If there are more interfaces on the list, count
* them. This allows the caller to set ifmr->ifm_count
* to 0 on the first call to know how much space to
* allocate.
*/
LIST_FOREACH(ep, &ifm->ifm_list, ifm_list)
usermax++;
/*
* Don't allow the user to ask for too many
* or a negative number.
*/
if (ifmr->ifm_count > usermax)
ifmr->ifm_count = usermax;
else if (ifmr->ifm_count < 0)
return (EINVAL);
if (ifmr->ifm_count != 0) {
kptr = (int *)malloc(ifmr->ifm_count * sizeof(int),
M_TEMP, M_NOWAIT);
if (kptr == NULL)
return (ENOMEM);
/*
* Get the media words from the interface's list.
*/
ep = LIST_FIRST(&ifm->ifm_list);
for (; ep != NULL && count < ifmr->ifm_count;
ep = LIST_NEXT(ep, ifm_list), count++)
kptr[count] = ep->ifm_media;
if (ep != NULL)
error = E2BIG; /* oops! */
} else {
count = usermax;
}
/*
* We do the copyout on E2BIG, because that's
* just our way of telling userland that there
* are more. This is the behavior I've observed
* under BSD/OS 3.0
*/
sticky = error;
if ((error == 0 || error == E2BIG) && ifmr->ifm_count != 0) {
error = copyout((caddr_t)kptr,
(caddr_t)ifmr->ifm_ulist,
ifmr->ifm_count * sizeof(int));
}
if (error == 0)
error = sticky;
if (ifmr->ifm_count != 0)
free(kptr, M_TEMP);
ifmr->ifm_count = count;
break;
}
default:
return (EINVAL);
}
return (error);
}
/*
* Find media entry matching a given ifm word.
*
*/
static struct ifmedia_entry *
ifmedia_match(ifm, target, mask)
struct ifmedia *ifm;
int target;
int mask;
{
struct ifmedia_entry *match, *next;
match = NULL;
mask = ~mask;
LIST_FOREACH(next, &ifm->ifm_list, ifm_list) {
if ((next->ifm_media & mask) == (target & mask)) {
#if defined(IFMEDIA_DEBUG) || defined(DIAGNOSTIC)
if (match) {
printf("ifmedia_match: multiple match for "
"0x%x/0x%x\n", target, mask);
}
#endif
match = next;
}
}
return match;
}
/*
* Compute the interface `baudrate' from the media, for the interface
* metrics (used by routing daemons).
*/
static const struct ifmedia_baudrate ifmedia_baudrate_descriptions[] =
IFM_BAUDRATE_DESCRIPTIONS;
uint64_t
ifmedia_baudrate(int mword)
{
int i;
for (i = 0; ifmedia_baudrate_descriptions[i].ifmb_word != 0; i++) {
if ((mword & (IFM_NMASK|IFM_TMASK)) ==
ifmedia_baudrate_descriptions[i].ifmb_word)
return (ifmedia_baudrate_descriptions[i].ifmb_baudrate);
}
/* Not known. */
return (0);
}
#ifdef IFMEDIA_DEBUG
struct ifmedia_description ifm_type_descriptions[] =
IFM_TYPE_DESCRIPTIONS;
struct ifmedia_description ifm_subtype_ethernet_descriptions[] =
IFM_SUBTYPE_ETHERNET_DESCRIPTIONS;
struct ifmedia_description ifm_subtype_ethernet_option_descriptions[] =
IFM_SUBTYPE_ETHERNET_OPTION_DESCRIPTIONS;
struct ifmedia_description ifm_subtype_tokenring_descriptions[] =
IFM_SUBTYPE_TOKENRING_DESCRIPTIONS;
struct ifmedia_description ifm_subtype_tokenring_option_descriptions[] =
IFM_SUBTYPE_TOKENRING_OPTION_DESCRIPTIONS;
struct ifmedia_description ifm_subtype_fddi_descriptions[] =
IFM_SUBTYPE_FDDI_DESCRIPTIONS;
struct ifmedia_description ifm_subtype_fddi_option_descriptions[] =
IFM_SUBTYPE_FDDI_OPTION_DESCRIPTIONS;
struct ifmedia_description ifm_subtype_ieee80211_descriptions[] =
IFM_SUBTYPE_IEEE80211_DESCRIPTIONS;
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_atm_descriptions[] =
IFM_SUBTYPE_ATM_DESCRIPTIONS;
struct ifmedia_description ifm_subtype_atm_option_descriptions[] =
IFM_SUBTYPE_ATM_OPTION_DESCRIPTIONS;
struct ifmedia_description ifm_subtype_shared_descriptions[] =
IFM_SUBTYPE_SHARED_DESCRIPTIONS;
struct ifmedia_description ifm_shared_option_descriptions[] =
IFM_SHARED_OPTION_DESCRIPTIONS;
struct ifmedia_type_to_subtype {
struct ifmedia_description *subtypes;
struct ifmedia_description *options;
struct ifmedia_description *modes;
};
/* must be in the same order as IFM_TYPE_DESCRIPTIONS */
struct ifmedia_type_to_subtype ifmedia_types_to_subtypes[] = {
{
&ifm_subtype_ethernet_descriptions[0],
&ifm_subtype_ethernet_option_descriptions[0],
NULL,
},
{
&ifm_subtype_tokenring_descriptions[0],
&ifm_subtype_tokenring_option_descriptions[0],
NULL,
},
{
&ifm_subtype_fddi_descriptions[0],
&ifm_subtype_fddi_option_descriptions[0],
NULL,
},
{
&ifm_subtype_ieee80211_descriptions[0],
&ifm_subtype_ieee80211_option_descriptions[0],
&ifm_subtype_ieee80211_mode_descriptions[0]
},
{
&ifm_subtype_atm_descriptions[0],
&ifm_subtype_atm_option_descriptions[0],
NULL,
},
};
/*
* print a media word.
*/
static void
ifmedia_printword(ifmw)
int ifmw;
{
struct ifmedia_description *desc;
struct ifmedia_type_to_subtype *ttos;
int seen_option = 0;
/* Find the top-level interface type. */
for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes;
desc->ifmt_string != NULL; desc++, ttos++)
if (IFM_TYPE(ifmw) == desc->ifmt_word)
break;
if (desc->ifmt_string == NULL) {
printf("<unknown type>\n");
return;
}
printf(desc->ifmt_string);
/* Any mode. */
for (desc = ttos->modes; desc && desc->ifmt_string != NULL; desc++)
if (IFM_MODE(ifmw) == desc->ifmt_word) {
if (desc->ifmt_string != NULL)
printf(" mode %s", desc->ifmt_string);
break;
}
/*
* Check for the shared subtype descriptions first, then the
* type-specific ones.
*/
for (desc = ifm_subtype_shared_descriptions;
desc->ifmt_string != NULL; desc++)
if (IFM_SUBTYPE(ifmw) == desc->ifmt_word)
goto got_subtype;
for (desc = ttos->subtypes; desc->ifmt_string != NULL; desc++)
if (IFM_SUBTYPE(ifmw) == desc->ifmt_word)
break;
if (desc->ifmt_string == NULL) {
printf(" <unknown subtype>\n");
return;
}
got_subtype:
printf(" %s", desc->ifmt_string);
/*
* Look for shared options.
*/
for (desc = ifm_shared_option_descriptions;
desc->ifmt_string != NULL; desc++) {
if (ifmw & desc->ifmt_word) {
if (seen_option == 0)
printf(" <");
printf("%s%s", seen_option++ ? "," : "",
desc->ifmt_string);
}
}
/*
* Look for subtype-specific options.
*/
for (desc = ttos->options; 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\n", seen_option ? ">" : "");
}
#endif /* IFMEDIA_DEBUG */