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freebsd/sys/net80211/ieee80211.c
Sam Leffler fba3db9f57 short preamble capability is not just for 11g; mark IEEE80211_F_SHPREAMBLE 
regardless of the operating mode

Obtained from:	MADWIFI
2003-09-14 22:32:18 +00:00

876 lines
24 KiB
C
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/*-
* Copyright (c) 2001 Atsushi Onoe
* Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* IEEE 802.11 generic handler
*/
#include "opt_inet.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/endian.h>
#include <sys/errno.h>
#include <sys/bus.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <machine/atomic.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_arp.h>
#include <net/ethernet.h>
#include <net/if_llc.h>
#include <net80211/ieee80211_var.h>
#include <net/bpf.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/if_ether.h>
#endif
#ifdef IEEE80211_DEBUG
int ieee80211_debug = 0;
SYSCTL_INT(_debug, OID_AUTO, ieee80211, CTLFLAG_RW, &ieee80211_debug,
0, "IEEE 802.11 media debugging printfs");
#endif
static void ieee80211_set11gbasicrates(struct ieee80211_rateset *,
enum ieee80211_phymode);
static const char *ieee80211_phymode_name[] = {
"auto", /* IEEE80211_MODE_AUTO */
"11a", /* IEEE80211_MODE_11A */
"11b", /* IEEE80211_MODE_11B */
"11g", /* IEEE80211_MODE_11G */
"turbo", /* IEEE80211_MODE_TURBO */
};
void
ieee80211_ifattach(struct ifnet *ifp)
{
struct ieee80211com *ic = (void *)ifp;
struct ieee80211_channel *c;
int i;
ether_ifattach(ifp, ic->ic_myaddr);
bpfattach2(ifp, DLT_IEEE802_11,
sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf);
ieee80211_crypto_attach(ifp);
/*
* Fill in 802.11 available channel set, mark
* all available channels as active, and pick
* a default channel if not already specified.
*/
memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail));
ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO;
for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
c = &ic->ic_channels[i];
if (c->ic_flags) {
/*
* Verify driver passed us valid data.
*/
if (i != ieee80211_chan2ieee(ic, c)) {
if_printf(ifp, "bad channel ignored; "
"freq %u flags %x number %u\n",
c->ic_freq, c->ic_flags, i);
c->ic_flags = 0; /* NB: remove */
continue;
}
setbit(ic->ic_chan_avail, i);
/*
* Identify mode capabilities.
*/
if (IEEE80211_IS_CHAN_A(c))
ic->ic_modecaps |= 1<<IEEE80211_MODE_11A;
if (IEEE80211_IS_CHAN_B(c))
ic->ic_modecaps |= 1<<IEEE80211_MODE_11B;
if (IEEE80211_IS_CHAN_PUREG(c))
ic->ic_modecaps |= 1<<IEEE80211_MODE_11G;
if (IEEE80211_IS_CHAN_T(c))
ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO;
}
}
/* validate ic->ic_curmode */
if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0)
ic->ic_curmode = IEEE80211_MODE_AUTO;
(void) ieee80211_setmode(ic, ic->ic_curmode);
ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */
if (ic->ic_lintval == 0)
ic->ic_lintval = 100; /* default sleep */
ic->ic_bmisstimeout = 7*ic->ic_lintval; /* default 7 beacons */
ieee80211_node_attach(ifp);
ieee80211_proto_attach(ifp);
}
void
ieee80211_ifdetach(struct ifnet *ifp)
{
struct ieee80211com *ic = (void *)ifp;
ieee80211_proto_detach(ifp);
ieee80211_crypto_detach(ifp);
ieee80211_node_detach(ifp);
ifmedia_removeall(&ic->ic_media);
bpfdetach(ifp);
ether_ifdetach(ifp);
}
/*
* Convert MHz frequency to IEEE channel number.
*/
u_int
ieee80211_mhz2ieee(u_int freq, u_int flags)
{
if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */
if (freq == 2484)
return 14;
if (freq < 2484)
return (freq - 2407) / 5;
else
return 15 + ((freq - 2512) / 20);
} else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */
return (freq - 5000) / 5;
} else { /* either, guess */
if (freq == 2484)
return 14;
if (freq < 2484)
return (freq - 2407) / 5;
if (freq < 5000)
return 15 + ((freq - 2512) / 20);
return (freq - 5000) / 5;
}
}
/*
* Convert channel to IEEE channel number.
*/
u_int
ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c)
{
if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX])
return c - ic->ic_channels;
else if (c == IEEE80211_CHAN_ANYC)
return IEEE80211_CHAN_ANY;
else if (c != NULL) {
if_printf(&ic->ic_if, "invalid channel freq %u flags %x\n",
c->ic_freq, c->ic_flags);
return 0; /* XXX */
} else {
if_printf(&ic->ic_if, "invalid channel (NULL)\n");
return 0; /* XXX */
}
}
/*
* Convert IEEE channel number to MHz frequency.
*/
u_int
ieee80211_ieee2mhz(u_int chan, u_int flags)
{
if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */
if (chan == 14)
return 2484;
if (chan < 14)
return 2407 + chan*5;
else
return 2512 + ((chan-15)*20);
} else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */
return 5000 + (chan*5);
} else { /* either, guess */
if (chan == 14)
return 2484;
if (chan < 14) /* 0-13 */
return 2407 + chan*5;
if (chan < 27) /* 15-26 */
return 2512 + ((chan-15)*20);
return 5000 + (chan*5);
}
}
/*
* Setup the media data structures according to the channel and
* rate tables. This must be called by the driver after
* ieee80211_attach and before most anything else.
*/
void
ieee80211_media_init(struct ifnet *ifp,
ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
{
#define ADD(_ic, _s, _o) \
ifmedia_add(&(_ic)->ic_media, \
IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL)
struct ieee80211com *ic = (void *)ifp;
struct ifmediareq imr;
int i, j, mode, rate, maxrate, mword, mopt, r;
struct ieee80211_rateset *rs;
struct ieee80211_rateset allrates;
/*
* Do late attach work that must wait for any subclass
* (i.e. driver) work such as overriding methods.
*/
ieee80211_node_lateattach(ifp);
/*
* Fill in media characteristics.
*/
ifmedia_init(&ic->ic_media, 0, media_change, media_stat);
maxrate = 0;
memset(&allrates, 0, sizeof(allrates));
for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) {
static const u_int mopts[] = {
IFM_AUTO,
IFM_MAKEMODE(IFM_IEEE80211_11A),
IFM_MAKEMODE(IFM_IEEE80211_11B),
IFM_MAKEMODE(IFM_IEEE80211_11G),
IFM_MAKEMODE(IFM_IEEE80211_11A) | IFM_IEEE80211_TURBO,
};
if ((ic->ic_modecaps & (1<<mode)) == 0)
continue;
mopt = mopts[mode];
ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */
if (ic->ic_caps & IEEE80211_C_IBSS)
ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC);
if (ic->ic_caps & IEEE80211_C_HOSTAP)
ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP);
if (ic->ic_caps & IEEE80211_C_AHDEMO)
ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
if (ic->ic_caps & IEEE80211_C_MONITOR)
ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR);
if (mode == IEEE80211_MODE_AUTO)
continue;
if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]);
rs = &ic->ic_sup_rates[mode];
for (i = 0; i < rs->rs_nrates; i++) {
rate = rs->rs_rates[i];
mword = ieee80211_rate2media(ic, rate, mode);
if (mword == 0)
continue;
printf("%s%d%sMbps", (i != 0 ? " " : ""),
(rate & IEEE80211_RATE_VAL) / 2,
((rate & 0x1) != 0 ? ".5" : ""));
ADD(ic, mword, mopt);
if (ic->ic_caps & IEEE80211_C_IBSS)
ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC);
if (ic->ic_caps & IEEE80211_C_HOSTAP)
ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP);
if (ic->ic_caps & IEEE80211_C_AHDEMO)
ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
if (ic->ic_caps & IEEE80211_C_MONITOR)
ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR);
/*
* Add rate to the collection of all rates.
*/
r = rate & IEEE80211_RATE_VAL;
for (j = 0; j < allrates.rs_nrates; j++)
if (allrates.rs_rates[j] == r)
break;
if (j == allrates.rs_nrates) {
/* unique, add to the set */
allrates.rs_rates[j] = r;
allrates.rs_nrates++;
}
rate = (rate & IEEE80211_RATE_VAL) / 2;
if (rate > maxrate)
maxrate = rate;
}
printf("\n");
}
for (i = 0; i < allrates.rs_nrates; i++) {
mword = ieee80211_rate2media(ic, allrates.rs_rates[i],
IEEE80211_MODE_AUTO);
if (mword == 0)
continue;
mword = IFM_SUBTYPE(mword); /* remove media options */
ADD(ic, mword, 0);
if (ic->ic_caps & IEEE80211_C_IBSS)
ADD(ic, mword, IFM_IEEE80211_ADHOC);
if (ic->ic_caps & IEEE80211_C_HOSTAP)
ADD(ic, mword, IFM_IEEE80211_HOSTAP);
if (ic->ic_caps & IEEE80211_C_AHDEMO)
ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0);
if (ic->ic_caps & IEEE80211_C_MONITOR)
ADD(ic, mword, IFM_IEEE80211_MONITOR);
}
ieee80211_media_status(ifp, &imr);
ifmedia_set(&ic->ic_media, imr.ifm_active);
if (maxrate)
ifp->if_baudrate = IF_Mbps(maxrate);
#undef ADD
}
static int
findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate)
{
#define IEEERATE(_ic,_m,_i) \
((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL)
int i, nrates = ic->ic_sup_rates[mode].rs_nrates;
for (i = 0; i < nrates; i++)
if (IEEERATE(ic, mode, i) == rate)
return i;
return -1;
#undef IEEERATE
}
/*
* Handle a media change request.
*/
int
ieee80211_media_change(struct ifnet *ifp)
{
struct ieee80211com *ic = (void *)ifp;
struct ifmedia_entry *ime;
enum ieee80211_opmode newopmode;
enum ieee80211_phymode newphymode;
int i, j, newrate, error = 0;
ime = ic->ic_media.ifm_cur;
/*
* First, identify the phy mode.
*/
switch (IFM_MODE(ime->ifm_media)) {
case IFM_IEEE80211_11A:
newphymode = IEEE80211_MODE_11A;
break;
case IFM_IEEE80211_11B:
newphymode = IEEE80211_MODE_11B;
break;
case IFM_IEEE80211_11G:
newphymode = IEEE80211_MODE_11G;
break;
case IFM_AUTO:
newphymode = IEEE80211_MODE_AUTO;
break;
default:
return EINVAL;
}
/*
* Turbo mode is an ``option''. Eventually it
* needs to be applied to 11g too.
*/
if (ime->ifm_media & IFM_IEEE80211_TURBO) {
if (newphymode != IEEE80211_MODE_11A)
return EINVAL;
newphymode = IEEE80211_MODE_TURBO;
}
/*
* Validate requested mode is available.
*/
if ((ic->ic_modecaps & (1<<newphymode)) == 0)
return EINVAL;
/*
* Next, the fixed/variable rate.
*/
i = -1;
if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) {
/*
* Convert media subtype to rate.
*/
newrate = ieee80211_media2rate(ime->ifm_media);
if (newrate == 0)
return EINVAL;
/*
* Check the rate table for the specified/current phy.
*/
if (newphymode == IEEE80211_MODE_AUTO) {
/*
* In autoselect mode search for the rate.
*/
for (j = IEEE80211_MODE_11A;
j < IEEE80211_MODE_MAX; j++) {
if ((ic->ic_modecaps & (1<<j)) == 0)
continue;
i = findrate(ic, j, newrate);
if (i != -1) {
/* lock mode too */
newphymode = j;
break;
}
}
} else {
i = findrate(ic, newphymode, newrate);
}
if (i == -1) /* mode/rate mismatch */
return EINVAL;
}
/* NB: defer rate setting to later */
/*
* Deduce new operating mode but don't install it just yet.
*/
if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) ==
(IFM_IEEE80211_ADHOC|IFM_FLAG0))
newopmode = IEEE80211_M_AHDEMO;
else if (ime->ifm_media & IFM_IEEE80211_HOSTAP)
newopmode = IEEE80211_M_HOSTAP;
else if (ime->ifm_media & IFM_IEEE80211_ADHOC)
newopmode = IEEE80211_M_IBSS;
else if (ime->ifm_media & IFM_IEEE80211_MONITOR)
newopmode = IEEE80211_M_MONITOR;
else
newopmode = IEEE80211_M_STA;
/*
* Autoselect doesn't make sense when operating as an AP.
* If no phy mode has been selected, pick one and lock it
* down so rate tables can be used in forming beacon frames
* and the like.
*/
if (newopmode == IEEE80211_M_HOSTAP &&
newphymode == IEEE80211_MODE_AUTO) {
for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++)
if (ic->ic_modecaps & (1<<j)) {
newphymode = j;
break;
}
}
/*
* Handle phy mode change.
*/
if (ic->ic_curmode != newphymode) { /* change phy mode */
error = ieee80211_setmode(ic, newphymode);
if (error != 0)
return error;
error = ENETRESET;
}
/*
* Committed to changes, install the rate setting.
*/
if (ic->ic_fixed_rate != i) {
ic->ic_fixed_rate = i; /* set fixed tx rate */
error = ENETRESET;
}
/*
* Handle operating mode change.
*/
if (ic->ic_opmode != newopmode) {
ic->ic_opmode = newopmode;
switch (newopmode) {
case IEEE80211_M_AHDEMO:
case IEEE80211_M_HOSTAP:
case IEEE80211_M_STA:
case IEEE80211_M_MONITOR:
ic->ic_flags &= ~IEEE80211_F_IBSSON;
break;
case IEEE80211_M_IBSS:
ic->ic_flags |= IEEE80211_F_IBSSON;
#ifdef notdef
if (ic->ic_curmode == IEEE80211_MODE_11G)
ieee80211_set11gbasicrates(
&ic->ic_suprates[newphymode],
IEEE80211_MODE_11B);
#endif
break;
}
error = ENETRESET;
}
#ifdef notdef
if (error == 0)
ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media);
#endif
return error;
}
void
ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr)
{
struct ieee80211com *ic = (void *)ifp;
struct ieee80211_node *ni = NULL;
imr->ifm_status = IFM_AVALID;
imr->ifm_active = IFM_IEEE80211;
if (ic->ic_state == IEEE80211_S_RUN)
imr->ifm_status |= IFM_ACTIVE;
imr->ifm_active |= IFM_AUTO;
switch (ic->ic_opmode) {
case IEEE80211_M_STA:
ni = ic->ic_bss;
/* calculate rate subtype */
imr->ifm_active |= ieee80211_rate2media(ic,
ni->ni_rates.rs_rates[ni->ni_txrate], ic->ic_curmode);
break;
case IEEE80211_M_IBSS:
imr->ifm_active |= IFM_IEEE80211_ADHOC;
break;
case IEEE80211_M_AHDEMO:
/* should not come here */
break;
case IEEE80211_M_HOSTAP:
imr->ifm_active |= IFM_IEEE80211_HOSTAP;
break;
case IEEE80211_M_MONITOR:
imr->ifm_active |= IFM_IEEE80211_MONITOR;
break;
}
switch (ic->ic_curmode) {
case IEEE80211_MODE_11A:
imr->ifm_active |= IFM_MAKEMODE(IFM_IEEE80211_11A);
break;
case IEEE80211_MODE_11B:
imr->ifm_active |= IFM_MAKEMODE(IFM_IEEE80211_11B);
break;
case IEEE80211_MODE_11G:
imr->ifm_active |= IFM_MAKEMODE(IFM_IEEE80211_11G);
break;
case IEEE80211_MODE_TURBO:
imr->ifm_active |= IFM_MAKEMODE(IFM_IEEE80211_11A)
| IFM_IEEE80211_TURBO;
break;
}
}
void
ieee80211_watchdog(struct ifnet *ifp)
{
struct ieee80211com *ic = (void *)ifp;
if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0)
ieee80211_new_state(ic, IEEE80211_S_SCAN, -1);
if (ic->ic_inact_timer && --ic->ic_inact_timer == 0)
ieee80211_timeout_nodes(ic);
if (ic->ic_mgt_timer != 0 || ic->ic_inact_timer != 0)
ifp->if_timer = 1;
}
/*
* Mark the basic rates for the 11g rate table based on the
* operating mode. For real 11g we mark all the 11b rates
* and 6, 12, and 24 OFDM. For 11b compatibility we mark only
* 11b rates. There's also a pseudo 11a-mode used to mark only
* the basic OFDM rates.
*/
static void
ieee80211_set11gbasicrates(struct ieee80211_rateset *rs, enum ieee80211_phymode mode)
{
static const struct ieee80211_rateset basic[] = {
{ 3, { 12, 24, 48 } }, /* IEEE80211_MODE_11A */
{ 4, { 2, 4, 11, 22 } }, /* IEEE80211_MODE_11B */
{ 7, { 2, 4, 11, 22, 12, 24, 48 } },/* IEEE80211_MODE_11G */
{ 0 }, /* IEEE80211_MODE_TURBO */
};
int i, j;
for (i = 0; i < rs->rs_nrates; i++) {
rs->rs_rates[i] &= IEEE80211_RATE_VAL;
for (j = 0; j < basic[mode].rs_nrates; j++)
if (basic[mode].rs_rates[j] == rs->rs_rates[i]) {
rs->rs_rates[i] |= IEEE80211_RATE_BASIC;
break;
}
}
}
/*
* Set the current phy mode and recalculate the active channel
* set based on the available channels for this mode. Also
* select a new default/current channel if the current one is
* inappropriate for this mode.
*/
int
ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode)
{
#define N(a) (sizeof(a) / sizeof(a[0]))
static const u_int chanflags[] = {
0, /* IEEE80211_MODE_AUTO */
IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */
IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */
IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */
IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO */
};
struct ieee80211_channel *c;
u_int modeflags;
int i;
/* validate new mode */
if ((ic->ic_modecaps & (1<<mode)) == 0) {
IEEE80211_DPRINTF(("%s: mode %u not supported (caps 0x%x)\n",
__func__, mode, ic->ic_modecaps));
return EINVAL;
}
/*
* Verify at least one channel is present in the available
* channel list before committing to the new mode.
*/
KASSERT(mode < N(chanflags), ("Unexpected mode %u\n", mode));
modeflags = chanflags[mode];
for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
c = &ic->ic_channels[i];
if (mode == IEEE80211_MODE_AUTO) {
/* ignore turbo channels for autoselect */
if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0)
break;
} else {
if ((c->ic_flags & modeflags) == modeflags)
break;
}
}
if (i > IEEE80211_CHAN_MAX) {
IEEE80211_DPRINTF(("%s: no channels found for mode %u\n",
__func__, mode));
return EINVAL;
}
/*
* Calculate the active channel set.
*/
memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active));
for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
c = &ic->ic_channels[i];
if (mode == IEEE80211_MODE_AUTO) {
/* take anything but pure turbo channels */
if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0)
setbit(ic->ic_chan_active, i);
} else {
if ((c->ic_flags & modeflags) == modeflags)
setbit(ic->ic_chan_active, i);
}
}
/*
* If no current/default channel is setup or the current
* channel is wrong for the mode then pick the first
* available channel from the active list. This is likely
* not the right one.
*/
if (ic->ic_ibss_chan == NULL ||
isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) {
for (i = 0; i <= IEEE80211_CHAN_MAX; i++)
if (isset(ic->ic_chan_active, i)) {
ic->ic_ibss_chan = &ic->ic_channels[i];
break;
}
}
/*
* Set/reset state flags that influence beacon contents, etc.
*
* XXX what if we have stations already associated???
* XXX probably not right for autoselect?
*/
if (ic->ic_caps & IEEE80211_C_SHPREAMBLE)
ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
if (mode == IEEE80211_MODE_11G) {
if (ic->ic_caps & IEEE80211_C_SHSLOT)
ic->ic_flags |= IEEE80211_F_SHSLOT;
ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode],
IEEE80211_MODE_11G);
} else {
ic->ic_flags &= ~IEEE80211_F_SHSLOT;
}
ic->ic_curmode = mode;
return 0;
#undef N
}
/*
* Return the phy mode for with the specified channel so the
* caller can select a rate set. This is problematic and the
* work here assumes how things work elsewhere in this code.
*/
enum ieee80211_phymode
ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan)
{
/*
* NB: this assumes the channel would not be supplied to us
* unless it was already compatible with the current mode.
*/
if (ic->ic_curmode != IEEE80211_MODE_AUTO)
return ic->ic_curmode;
/*
* In autoselect mode; deduce a mode based on the channel
* characteristics. We assume that turbo-only channels
* are not considered when the channel set is constructed.
*/
if (IEEE80211_IS_CHAN_5GHZ(chan))
return IEEE80211_MODE_11A;
else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN))
return IEEE80211_MODE_11G;
else
return IEEE80211_MODE_11B;
}
/*
* convert IEEE80211 rate value to ifmedia subtype.
* ieee80211 rate is in unit of 0.5Mbps.
*/
int
ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode)
{
#define N(a) (sizeof(a) / sizeof(a[0]))
static const struct {
u_int m; /* rate + mode */
u_int r; /* if_media rate */
} rates[] = {
{ 2 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS1 },
{ 4 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS2 },
{ 11 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS5 },
{ 22 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS11 },
{ 44 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS22 },
{ 12 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM6 },
{ 18 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM9 },
{ 24 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM12 },
{ 36 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM18 },
{ 48 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM24 },
{ 72 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM36 },
{ 96 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM48 },
{ 108 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM54 },
{ 2 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_DS1 },
{ 4 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_DS2 },
{ 11 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_DS5 },
{ 22 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_DS11 },
{ 12 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM6 },
{ 18 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM9 },
{ 24 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM12 },
{ 36 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM18 },
{ 48 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM24 },
{ 72 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM36 },
{ 96 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM48 },
{ 108 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM54 },
/* NB: OFDM72 doesn't realy exist so we don't handle it */
};
u_int mask, i;
mask = rate & IEEE80211_RATE_VAL;
switch (mode) {
case IEEE80211_MODE_11A:
case IEEE80211_MODE_TURBO:
mask |= IFM_MAKEMODE(IFM_IEEE80211_11A);
break;
case IEEE80211_MODE_11B:
mask |= IFM_MAKEMODE(IFM_IEEE80211_11B);
break;
case IEEE80211_MODE_AUTO:
/* NB: ic may be NULL for some drivers */
if (ic && ic->ic_phytype == IEEE80211_T_FH) {
/* must handle these specially */
switch (mask) {
case 2: return IFM_IEEE80211_FH1;
case 4: return IFM_IEEE80211_FH2;
}
return IFM_AUTO;
}
/* NB: hack, 11g matches both 11b+11a rates */
/* fall thru... */
case IEEE80211_MODE_11G:
mask |= IFM_MAKEMODE(IFM_IEEE80211_11G);
break;
}
for (i = 0; i < N(rates); i++)
if (rates[i].m == mask)
return rates[i].r;
return IFM_AUTO;
#undef N
}
int
ieee80211_media2rate(int mword)
{
#define N(a) (sizeof(a) / sizeof(a[0]))
static const int ieeerates[] = {
-1, /* IFM_AUTO */
0, /* IFM_MANUAL */
0, /* IFM_NONE */
2, /* IFM_IEEE80211_FH1 */
4, /* IFM_IEEE80211_FH2 */
2, /* IFM_IEEE80211_DS1 */
4, /* IFM_IEEE80211_DS2 */
11, /* IFM_IEEE80211_DS5 */
22, /* IFM_IEEE80211_DS11 */
44, /* IFM_IEEE80211_DS22 */
12, /* IFM_IEEE80211_OFDM6 */
18, /* IFM_IEEE80211_OFDM9 */
24, /* IFM_IEEE80211_OFDM12 */
36, /* IFM_IEEE80211_OFDM18 */
48, /* IFM_IEEE80211_OFDM24 */
72, /* IFM_IEEE80211_OFDM36 */
96, /* IFM_IEEE80211_OFDM48 */
108, /* IFM_IEEE80211_OFDM54 */
144, /* IFM_IEEE80211_OFDM72 */
};
return IFM_SUBTYPE(mword) < N(ieeerates) ?
ieeerates[IFM_SUBTYPE(mword)] : 0;
#undef N
}
/*
* Module glue.
*
* NB: the module name is "wlan" for compatibility with NetBSD.
*/
static int
ieee80211_modevent(module_t mod, int type, void *unused)
{
switch (type) {
case MOD_LOAD:
if (bootverbose)
printf("wlan: <802.11 Link Layer>\n");
return 0;
case MOD_UNLOAD:
return 0;
}
return EINVAL;
}
static moduledata_t ieee80211_mod = {
"wlan",
ieee80211_modevent,
0
};
DECLARE_MODULE(wlan, ieee80211_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
MODULE_VERSION(wlan, 1);
MODULE_DEPEND(wlan, rc4, 1, 1, 1);
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