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freebsd-nq/sys/net80211/ieee80211.c
Sam Leffler ca4ac7ae14 Add initial support for 900MHz cards like the Ubiquiti SR9: 
o add channel flag to enable freq <-> ieee channel # mapping (can
  go away in the future when ieee number is precomputed)
o add mapping between 900mhz freq's and channel #'s that gives a
  unique channel # for each half/quarter/full width channel
o remove assumptions that half/quarter rate channels on happen in 11a
o remove assumptions that all 11g channels are full width
o ensure ic_curchan is reset on mode change so changing the channel
  list (e.g. on countrycode change) doesn't leave curchan set to an
  invalid channel

There is still an issue with switching rate sets; to be fixed separately.

MFC after:	1 month
2007-01-15 01:12:28 +00:00

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/*-
* Copyright (c) 2001 Atsushi Onoe
* Copyright (c) 2002-2005 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 <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_media.h>
#include <net/ethernet.h>
#include <net80211/ieee80211_var.h>
#include <net/bpf.h>
const char *ieee80211_phymode_name[] = {
"auto", /* IEEE80211_MODE_AUTO */
"11a", /* IEEE80211_MODE_11A */
"11b", /* IEEE80211_MODE_11B */
"11g", /* IEEE80211_MODE_11G */
"FH", /* IEEE80211_MODE_FH */
"turboA", /* IEEE80211_MODE_TURBO_A */
"turboG", /* IEEE80211_MODE_TURBO_G */
};
/*
* Default supported rates for 802.11 operation (in IEEE .5Mb units).
*/
#define B(r) ((r) | IEEE80211_RATE_BASIC)
static const struct ieee80211_rateset ieee80211_rateset_11a =
{ 8, { B(12), 18, B(24), 36, B(48), 72, 96, 108 } };
static const struct ieee80211_rateset ieee80211_rateset_half =
{ 8, { B(6), 9, B(12), 18, B(24), 36, 48, 54 } };
static const struct ieee80211_rateset ieee80211_rateset_quarter =
{ 8, { B(3), 4, B(6), 9, B(12), 18, 24, 27 } };
static const struct ieee80211_rateset ieee80211_rateset_11b =
{ 4, { B(2), B(4), B(11), B(22) } };
/* NB: OFDM rates are handled specially based on mode */
static const struct ieee80211_rateset ieee80211_rateset_11g =
{ 12, { B(2), B(4), B(11), B(22), 12, 18, 24, 36, 48, 72, 96, 108 } };
#undef B
/* list of all instances */
SLIST_HEAD(ieee80211_list, ieee80211com);
static struct ieee80211_list ieee80211_list =
SLIST_HEAD_INITIALIZER(ieee80211_list);
static u_int8_t ieee80211_vapmap[32]; /* enough for 256 */
static struct mtx ieee80211_vap_mtx;
MTX_SYSINIT(ieee80211, &ieee80211_vap_mtx, "net80211 instances", MTX_DEF);
static void
ieee80211_add_vap(struct ieee80211com *ic)
{
#define N(a) (sizeof(a)/sizeof(a[0]))
int i;
u_int8_t b;
mtx_lock(&ieee80211_vap_mtx);
ic->ic_vap = 0;
for (i = 0; i < N(ieee80211_vapmap) && ieee80211_vapmap[i] == 0xff; i++)
ic->ic_vap += NBBY;
if (i == N(ieee80211_vapmap))
panic("vap table full");
for (b = ieee80211_vapmap[i]; b & 1; b >>= 1)
ic->ic_vap++;
setbit(ieee80211_vapmap, ic->ic_vap);
SLIST_INSERT_HEAD(&ieee80211_list, ic, ic_next);
mtx_unlock(&ieee80211_vap_mtx);
#undef N
}
static void
ieee80211_remove_vap(struct ieee80211com *ic)
{
mtx_lock(&ieee80211_vap_mtx);
SLIST_REMOVE(&ieee80211_list, ic, ieee80211com, ic_next);
KASSERT(ic->ic_vap < sizeof(ieee80211_vapmap)*NBBY,
("invalid vap id %d", ic->ic_vap));
KASSERT(isset(ieee80211_vapmap, ic->ic_vap),
("vap id %d not allocated", ic->ic_vap));
clrbit(ieee80211_vapmap, ic->ic_vap);
mtx_unlock(&ieee80211_vap_mtx);
}
/*
* Default reset method for use with the ioctl support. This
* method is invoked after any state change in the 802.11
* layer that should be propagated to the hardware but not
* require re-initialization of the 802.11 state machine (e.g
* rescanning for an ap). We always return ENETRESET which
* should cause the driver to re-initialize the device. Drivers
* can override this method to implement more optimized support.
*/
static int
ieee80211_default_reset(struct ifnet *ifp)
{
return ENETRESET;
}
/*
* Fill in 802.11 available channel set, mark
* all available channels as active, and pick
* a default channel if not already specified.
*/
static void
ieee80211_chan_init(struct ieee80211com *ic)
{
#define DEFAULTRATES(m, def) do { \
if ((ic->ic_modecaps & (1<<m)) && ic->ic_sup_rates[m].rs_nrates == 0) \
ic->ic_sup_rates[m] = def; \
} while (0)
struct ifnet *ifp = ic->ic_ifp;
struct ieee80211_channel *c;
int i;
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_ANYG(c))
ic->ic_modecaps |= 1<<IEEE80211_MODE_11G;
if (IEEE80211_IS_CHAN_FHSS(c))
ic->ic_modecaps |= 1<<IEEE80211_MODE_FH;
if (IEEE80211_IS_CHAN_T(c))
ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_A;
if (IEEE80211_IS_CHAN_108G(c))
ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_G;
if (ic->ic_curchan == NULL) {
/* arbitrarily pick the first channel */
ic->ic_curchan = &ic->ic_channels[i];
}
}
}
/* fillin well-known rate sets if driver has not specified */
DEFAULTRATES(IEEE80211_MODE_11B, ieee80211_rateset_11b);
DEFAULTRATES(IEEE80211_MODE_11G, ieee80211_rateset_11g);
DEFAULTRATES(IEEE80211_MODE_11A, ieee80211_rateset_11a);
DEFAULTRATES(IEEE80211_MODE_TURBO_A, ieee80211_rateset_11a);
DEFAULTRATES(IEEE80211_MODE_TURBO_G, ieee80211_rateset_11g);
/*
* Set auto mode to reset active channel state and any desired channel.
*/
(void) ieee80211_setmode(ic, IEEE80211_MODE_AUTO);
#undef DEFAULTRATES
}
void
ieee80211_ifattach(struct ieee80211com *ic)
{
struct ifnet *ifp = ic->ic_ifp;
ether_ifattach(ifp, ic->ic_myaddr);
ifp->if_output = ieee80211_output;
bpfattach2(ifp, DLT_IEEE802_11,
sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf);
ieee80211_crypto_attach(ic);
ic->ic_des_chan = IEEE80211_CHAN_ANYC;
/*
* Fill in 802.11 available channel set, mark all
* available channels as active, and pick a default
* channel if not already specified.
*/
ieee80211_chan_init(ic);
#if 0
/*
* Enable WME by default if we're capable.
*/
if (ic->ic_caps & IEEE80211_C_WME)
ic->ic_flags |= IEEE80211_F_WME;
#endif
if (ic->ic_caps & IEEE80211_C_BURST)
ic->ic_flags |= IEEE80211_F_BURST;
ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT;
ic->ic_bmissthreshold = IEEE80211_HWBMISS_DEFAULT;
ic->ic_dtim_period = IEEE80211_DTIM_DEFAULT;
IEEE80211_BEACON_LOCK_INIT(ic, "beacon");
ic->ic_lintval = ic->ic_bintval;
ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX;
ieee80211_node_attach(ic);
ieee80211_proto_attach(ic);
ieee80211_add_vap(ic);
ieee80211_sysctl_attach(ic); /* NB: requires ic_vap */
/*
* Install a default reset method for the ioctl support.
* The driver is expected to fill this in before calling us.
*/
if (ic->ic_reset == NULL)
ic->ic_reset = ieee80211_default_reset;
KASSERT(ifp->if_spare2 == NULL, ("oops, hosed"));
ifp->if_spare2 = ic; /* XXX temp backpointer */
}
void
ieee80211_ifdetach(struct ieee80211com *ic)
{
struct ifnet *ifp = ic->ic_ifp;
ieee80211_remove_vap(ic);
ieee80211_sysctl_detach(ic);
/* NB: must be called before ieee80211_node_detach */
ieee80211_proto_detach(ic);
ieee80211_crypto_detach(ic);
ieee80211_node_detach(ic);
ifmedia_removeall(&ic->ic_media);
IEEE80211_BEACON_LOCK_DESTROY(ic);
bpfdetach(ifp);
ether_ifdetach(ifp);
}
static __inline int
mapgsm(u_int freq, u_int flags)
{
freq *= 10;
if (flags & IEEE80211_CHAN_QUARTER)
freq += 5;
else if (flags & IEEE80211_CHAN_HALF)
freq += 10;
else
freq += 20;
/* NB: there is no 907/20 wide but leave room */
return (freq - 906*10) / 5;
}
static __inline int
mappsb(u_int freq, u_int flags)
{
return 37 + ((freq * 10) + ((freq % 5) == 2 ? 5 : 0) - 49400) / 5;
}
/*
* Convert MHz frequency to IEEE channel number.
*/
int
ieee80211_mhz2ieee(u_int freq, u_int flags)
{
if (flags & IEEE80211_CHAN_GSM)
return mapgsm(freq, flags);
if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */
if (freq == 2484)
return 14;
if (freq < 2484)
return ((int) freq - 2407) / 5;
else
return 15 + ((freq - 2512) / 20);
} else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */
if (freq <= 5000) {
if (flags &(IEEE80211_CHAN_HALF|IEEE80211_CHAN_QUARTER))
return mappsb(freq, flags);
return (freq - 4000) / 5;
} else
return (freq - 5000) / 5;
} else { /* either, guess */
if (freq == 2484)
return 14;
if (freq < 2484) {
if (907 <= freq && freq <= 922)
return mapgsm(freq, flags);
return ((int) freq - 2407) / 5;
}
if (freq < 5000) {
if (flags &(IEEE80211_CHAN_HALF|IEEE80211_CHAN_QUARTER))
return mappsb(freq, flags);
else if (freq > 4900)
return (freq - 4000) / 5;
else
return 15 + ((freq - 2512) / 20);
}
return (freq - 5000) / 5;
}
}
/*
* Convert channel to IEEE channel number.
*/
int
ieee80211_chan2ieee(struct ieee80211com *ic, const 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_ifp, "invalid channel freq %u flags %x\n",
c->ic_freq, c->ic_flags);
return 0; /* XXX */
} else {
if_printf(ic->ic_ifp, "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_GSM)
return 907 + 5 * (chan / 10);
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 */
if (flags & (IEEE80211_CHAN_HALF|IEEE80211_CHAN_QUARTER)) {
chan -= 37;
return 4940 + chan*5 + (chan % 5 ? 2 : 0);
}
return 5000 + (chan*5);
} else { /* either, guess */
/* XXX can't distinguish PSB+GSM channels */
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 ieee80211com *ic,
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 ifnet *ifp = ic->ic_ifp;
struct ifmediareq imr;
int i, j, mode, rate, maxrate, mword, mopt, r;
struct ieee80211_rateset *rs;
struct ieee80211_rateset allrates;
/* NB: this works because the structure is initialized to zero */
if (LIST_EMPTY(&ic->ic_media.ifm_list)) {
/*
* Do late attach work that must wait for any subclass
* (i.e. driver) work such as overriding methods.
*/
ieee80211_node_lateattach(ic);
} else {
/*
* We are re-initializing the channel list; clear
* the existing media state as the media routines
* don't suppress duplicates.
*/
ifmedia_removeall(&ic->ic_media);
ieee80211_chan_init(ic);
}
/*
* 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_IEEE80211_11A,
IFM_IEEE80211_11B,
IFM_IEEE80211_11G,
IFM_IEEE80211_FH,
IFM_IEEE80211_11A | IFM_IEEE80211_TURBO,
IFM_IEEE80211_11G | 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;
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;
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;
}
}
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
}
const struct ieee80211_rateset *
ieee80211_get_suprates(struct ieee80211com *ic, const struct ieee80211_channel *c)
{
enum ieee80211_phymode mode = ieee80211_chan2mode(ic, c);
if (IEEE80211_IS_CHAN_HALF(c))
return &ieee80211_rateset_half;
if (IEEE80211_IS_CHAN_QUARTER(c))
return &ieee80211_rateset_quarter;
return &ic->ic_sup_rates[mode];
}
void
ieee80211_announce(struct ieee80211com *ic)
{
struct ifnet *ifp = ic->ic_ifp;
int i, mode, rate, mword;
struct ieee80211_rateset *rs;
for (mode = IEEE80211_MODE_11A; mode < IEEE80211_MODE_MAX; mode++) {
if ((ic->ic_modecaps & (1<<mode)) == 0)
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" : ""));
}
printf("\n");
}
}
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
}
/*
* Find an instance by it's mac address.
*/
struct ieee80211com *
ieee80211_find_vap(const u_int8_t mac[IEEE80211_ADDR_LEN])
{
struct ieee80211com *ic;
/* XXX lock */
SLIST_FOREACH(ic, &ieee80211_list, ic_next)
if (IEEE80211_ADDR_EQ(mac, ic->ic_myaddr))
return ic;
return NULL;
}
static struct ieee80211com *
ieee80211_find_instance(struct ifnet *ifp)
{
struct ieee80211com *ic;
/* XXX lock */
/* XXX not right for multiple instances but works for now */
SLIST_FOREACH(ic, &ieee80211_list, ic_next)
if (ic->ic_ifp == ifp)
return ic;
return NULL;
}
/*
* Handle a media change request.
*/
int
ieee80211_media_change(struct ifnet *ifp)
{
struct ieee80211com *ic;
struct ifmedia_entry *ime;
enum ieee80211_opmode newopmode;
enum ieee80211_phymode newphymode;
int i, j, newrate, error = 0;
ic = ieee80211_find_instance(ifp);
if (!ic) {
if_printf(ifp, "%s: no 802.11 instance!\n", __func__);
return EINVAL;
}
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_IEEE80211_FH:
newphymode = IEEE80211_MODE_FH;
break;
case IFM_AUTO:
newphymode = IEEE80211_MODE_AUTO;
break;
default:
return EINVAL;
}
/*
* Turbo mode is an ``option''.
* XXX does not apply to AUTO
*/
if (ime->ifm_media & IFM_IEEE80211_TURBO) {
if (newphymode == IEEE80211_MODE_11A)
newphymode = IEEE80211_MODE_TURBO_A;
else if (newphymode == IEEE80211_MODE_11G)
newphymode = IEEE80211_MODE_TURBO_G;
else
return EINVAL;
}
/*
* 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;
break;
}
/*
* Yech, slot time may change depending on the
* operating mode so reset it to be sure everything
* is setup appropriately.
*/
ieee80211_reset_erp(ic);
ieee80211_wme_initparams(ic); /* after opmode change */
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;
const struct ieee80211_rateset *rs;
ic = ieee80211_find_instance(ifp);
if (!ic) {
if_printf(ifp, "%s: no 802.11 instance!\n", __func__);
return;
}
imr->ifm_status = IFM_AVALID;
imr->ifm_active = IFM_IEEE80211;
if (ic->ic_state == IEEE80211_S_RUN)
imr->ifm_status |= IFM_ACTIVE;
/*
* Calculate a current rate if possible.
*/
if (ic->ic_fixed_rate != IEEE80211_FIXED_RATE_NONE) {
/*
* A fixed rate is set, report that.
*/
rs = ieee80211_get_suprates(ic, ic->ic_curchan);
imr->ifm_active |= ieee80211_rate2media(ic,
rs->rs_rates[ic->ic_fixed_rate], ic->ic_curmode);
} else if (ic->ic_opmode == IEEE80211_M_STA) {
/*
* In station mode report the current transmit rate.
*/
rs = &ic->ic_bss->ni_rates;
imr->ifm_active |= ieee80211_rate2media(ic,
rs->rs_rates[ic->ic_bss->ni_txrate], ic->ic_curmode);
} else
imr->ifm_active |= IFM_AUTO;
switch (ic->ic_opmode) {
case IEEE80211_M_STA:
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_IEEE80211_11A;
break;
case IEEE80211_MODE_11B:
imr->ifm_active |= IFM_IEEE80211_11B;
break;
case IEEE80211_MODE_11G:
imr->ifm_active |= IFM_IEEE80211_11G;
break;
case IEEE80211_MODE_FH:
imr->ifm_active |= IFM_IEEE80211_FH;
break;
case IEEE80211_MODE_TURBO_A:
imr->ifm_active |= IFM_IEEE80211_11A
| IFM_IEEE80211_TURBO;
break;
case IEEE80211_MODE_TURBO_G:
imr->ifm_active |= IFM_IEEE80211_11G
| IFM_IEEE80211_TURBO;
break;
}
}
void
ieee80211_watchdog(struct ieee80211com *ic)
{
struct ieee80211_node_table *nt;
int need_inact_timer = 0;
if (ic->ic_state != IEEE80211_S_INIT) {
if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0)
ieee80211_new_state(ic, IEEE80211_S_SCAN, 0);
nt = &ic->ic_scan;
if (nt->nt_inact_timer) {
if (--nt->nt_inact_timer == 0)
nt->nt_timeout(nt);
need_inact_timer += nt->nt_inact_timer;
}
nt = &ic->ic_sta;
if (nt->nt_inact_timer) {
if (--nt->nt_inact_timer == 0)
nt->nt_timeout(nt);
need_inact_timer += nt->nt_inact_timer;
}
}
if (ic->ic_mgt_timer != 0 || need_inact_timer)
ic->ic_ifp->if_timer = 1;
}
/*
* 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_FHSS, /* IEEE80211_MODE_FH */
IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO_A */
IEEE80211_CHAN_108G, /* IEEE80211_MODE_TURBO_G */
};
struct ieee80211_channel *c;
u_int modeflags;
int i;
/* validate new mode */
if ((ic->ic_modecaps & (1<<mode)) == 0) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
"%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", mode));
modeflags = chanflags[mode];
for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
c = &ic->ic_channels[i];
if (c->ic_flags == 0)
continue;
if (mode == IEEE80211_MODE_AUTO) {
/* ignore static turbo channels for autoselect */
if (!IEEE80211_IS_CHAN_T(c))
break;
} else {
if ((c->ic_flags & modeflags) == modeflags)
break;
}
}
if (i > IEEE80211_CHAN_MAX) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
"%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 (c->ic_flags == 0)
continue;
if (mode == IEEE80211_MODE_AUTO) {
/* take anything but static turbo channels */
if (!IEEE80211_IS_CHAN_T(c))
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 (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_curchan))) {
ic->ic_curchan = NULL;
for (i = 0; i <= IEEE80211_CHAN_MAX; i++)
if (isset(ic->ic_chan_active, i)) {
ic->ic_curchan = &ic->ic_channels[i];
break;
}
KASSERT(ic->ic_curchan != NULL, ("no current channel"));
}
if (ic->ic_ibss_chan == NULL ||
isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan)))
ic->ic_ibss_chan = ic->ic_curchan;
/*
* If the desired channel is set but no longer valid then reset it.
*/
if (ic->ic_des_chan != IEEE80211_CHAN_ANYC &&
isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_des_chan)))
ic->ic_des_chan = IEEE80211_CHAN_ANYC;
/*
* Adjust basic rates in 11b/11g supported rate set.
* Note that if operating on a hal/quarter rate channel
* this is a noop as those rates sets are different
* and used instead.
*/
if (mode == IEEE80211_MODE_11G || mode == IEEE80211_MODE_11B)
ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], mode);
/*
* Setup an initial rate set according to the
* current/default channel selected above. This
* will be changed when scanning but must exist
* now so driver have a consistent state of ic_ibss_chan.
*/
if (ic->ic_bss != NULL) /* NB: can be called before lateattach */
ic->ic_bss->ni_rates = ic->ic_sup_rates[mode];
ic->ic_curmode = mode;
ieee80211_reset_erp(ic); /* reset ERP state */
ieee80211_wme_initparams(ic); /* reset WME stat */
return 0;
#undef N
}
/*
* Return the phy mode for with the specified channel so the
* caller can select a rate set. This is problematic for channels
* where multiple operating modes are possible (e.g. 11g+11b).
* In those cases we defer to the current operating mode when set.
*/
enum ieee80211_phymode
ieee80211_chan2mode(struct ieee80211com *ic, const struct ieee80211_channel *chan)
{
if (IEEE80211_IS_CHAN_T(chan)) {
return IEEE80211_MODE_TURBO_A;
} else if (IEEE80211_IS_CHAN_5GHZ(chan)) {
return IEEE80211_MODE_11A;
} else if (IEEE80211_IS_CHAN_FHSS(chan))
return IEEE80211_MODE_FH;
else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) {
/*
* This assumes all 11g channels are also usable
* for 11b, which is currently true.
*/
if (ic->ic_curmode == IEEE80211_MODE_TURBO_G)
return IEEE80211_MODE_TURBO_G;
if (ic->ic_curmode == IEEE80211_MODE_11B)
return IEEE80211_MODE_11B;
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_IEEE80211_FH, IFM_IEEE80211_FH1 },
{ 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 },
{ 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 },
{ 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 },
{ 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 },
{ 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 },
{ 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 },
{ 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 },
{ 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 },
{ 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 },
{ 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 },
{ 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 },
{ 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 },
{ 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 },
{ 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 },
{ 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 },
{ 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 },
{ 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 },
{ 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 },
{ 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 },
{ 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 },
{ 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 },
{ 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 },
{ 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 },
{ 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 },
{ 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 },
{ 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 },
{ 6 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM3 },
{ 9 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM4 },
{ 54 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM27 },
/* 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_A:
mask |= IFM_IEEE80211_11A;
break;
case IEEE80211_MODE_11B:
mask |= IFM_IEEE80211_11B;
break;
case IEEE80211_MODE_FH:
mask |= IFM_IEEE80211_FH;
break;
case IEEE80211_MODE_AUTO:
/* NB: ic may be NULL for some drivers */
if (ic && ic->ic_phytype == IEEE80211_T_FH) {
mask |= IFM_IEEE80211_FH;
break;
}
/* NB: hack, 11g matches both 11b+11a rates */
/* fall thru... */
case IEEE80211_MODE_11G:
case IEEE80211_MODE_TURBO_G:
mask |= 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 */
0, /* IFM_IEEE80211_DS354k */
0, /* IFM_IEEE80211_DS512k */
6, /* IFM_IEEE80211_OFDM3 */
9, /* IFM_IEEE80211_OFDM4 */
54, /* IFM_IEEE80211_OFDM27 */
};
return IFM_SUBTYPE(mword) < N(ieeerates) ?
ieeerates[IFM_SUBTYPE(mword)] : 0;
#undef N
}
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