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freebsd-dev/sys/net80211/ieee80211.c
Sam Leffler 68e8e04e93 Update 802.11 wireless support: 
o major overhaul of the way channels are handled: channels are now
  fully enumerated and uniquely identify the operating characteristics;
  these changes are visible to user applications which require changes
o make scanning support independent of the state machine to enable
  background scanning and roaming
o move scanning support into loadable modules based on the operating
  mode to enable different policies and reduce the memory footprint
  on systems w/ constrained resources
o add background scanning in station mode (no support for adhoc/ibss
  mode yet)
o significantly speedup sta mode scanning with a variety of techniques
o add roaming support when background scanning is supported; for now
  we use a simple algorithm to trigger a roam: we threshold the rssi
  and tx rate, if either drops too low we try to roam to a new ap
o add tx fragmentation support
o add first cut at 802.11n support: this code works with forthcoming
  drivers but is incomplete; it's included now to establish a baseline
  for other drivers to be developed and for user applications
o adjust max_linkhdr et. al. to reflect 802.11 requirements; this eliminates
  prepending mbufs for traffic generated locally
o add support for Atheros protocol extensions; mainly the fast frames
  encapsulation (note this can be used with any card that can tx+rx
  large frames correctly)
o add sta support for ap's that beacon both WPA1+2 support
o change all data types from bsd-style to posix-style
o propagate noise floor data from drivers to net80211 and on to user apps
o correct various issues in the sta mode state machine related to handling
  authentication and association failures
o enable the addition of sta mode power save support for drivers that need
  net80211 support (not in this commit)
o remove old WI compatibility ioctls (wicontrol is officially dead)
o change the data structures returned for get sta info and get scan
  results so future additions will not break user apps
o fixed tx rate is now maintained internally as an ieee rate and not an
  index into the rate set; this needs to be extended to deal with
  multi-mode operation
o add extended channel specifications to radiotap to enable 11n sniffing

Drivers:
o ath: add support for bg scanning, tx fragmentation, fast frames,
       dynamic turbo (lightly tested), 11n (sniffing only and needs
       new hal)
o awi: compile tested only
o ndis: lightly tested
o ipw: lightly tested
o iwi: add support for bg scanning (well tested but may have some
       rough edges)
o ral, ural, rum: add suppoort for bg scanning, calibrate rssi data
o wi: lightly tested

This work is based on contributions by Atheros, kmacy, sephe, thompsa,
mlaier, kevlo, and others.  Much of the scanning work was supported by
Atheros.  The 11n work was supported by Marvell.
2007-06-11 03:36:55 +00:00

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/*-
* Copyright (c) 2001 Atsushi Onoe
* Copyright (c) 2002-2007 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.
*
* 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 */
"sturboA", /* IEEE80211_MODE_STURBO_A */
"11na", /* IEEE80211_MODE_11NA */
"11ng", /* IEEE80211_MODE_11NG */
};
/*
* 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
static int media_status(enum ieee80211_opmode ,
const struct ieee80211_channel *);
/* list of all instances */
SLIST_HEAD(ieee80211_list, ieee80211com);
static struct ieee80211_list ieee80211_list =
SLIST_HEAD_INITIALIZER(ieee80211_list);
static uint8_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;
uint8_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 (isset(ic->ic_modecaps, m) && ic->ic_sup_rates[m].rs_nrates == 0) \
ic->ic_sup_rates[m] = def; \
} while (0)
struct ieee80211_channel *c;
int i;
KASSERT(0 < ic->ic_nchans && ic->ic_nchans < IEEE80211_CHAN_MAX,
("invalid number of channels specified: %u", ic->ic_nchans));
memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail));
setbit(ic->ic_modecaps, IEEE80211_MODE_AUTO);
for (i = 0; i < ic->ic_nchans; i++) {
c = &ic->ic_channels[i];
KASSERT(c->ic_flags != 0, ("channel with no flags"));
KASSERT(c->ic_ieee < IEEE80211_CHAN_MAX,
("channel with bogus ieee number %u", c->ic_ieee));
setbit(ic->ic_chan_avail, c->ic_ieee);
/*
* Identify mode capabilities.
*/
if (IEEE80211_IS_CHAN_A(c))
setbit(ic->ic_modecaps, IEEE80211_MODE_11A);
if (IEEE80211_IS_CHAN_B(c))
setbit(ic->ic_modecaps, IEEE80211_MODE_11B);
if (IEEE80211_IS_CHAN_ANYG(c))
setbit(ic->ic_modecaps, IEEE80211_MODE_11G);
if (IEEE80211_IS_CHAN_FHSS(c))
setbit(ic->ic_modecaps, IEEE80211_MODE_FH);
if (IEEE80211_IS_CHAN_108A(c))
setbit(ic->ic_modecaps, IEEE80211_MODE_TURBO_A);
if (IEEE80211_IS_CHAN_108G(c))
setbit(ic->ic_modecaps, IEEE80211_MODE_TURBO_G);
if (IEEE80211_IS_CHAN_ST(c))
setbit(ic->ic_modecaps, IEEE80211_MODE_STURBO_A);
if (IEEE80211_IS_CHAN_HTA(c))
setbit(ic->ic_modecaps, IEEE80211_MODE_11NA);
if (IEEE80211_IS_CHAN_HTG(c))
setbit(ic->ic_modecaps, IEEE80211_MODE_11NG);
}
/* initialize candidate channels to all available */
memcpy(ic->ic_chan_active, ic->ic_chan_avail,
sizeof(ic->ic_chan_avail));
ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */
ic->ic_bsschan = IEEE80211_CHAN_ANYC;
/* arbitrarily pick the first channel */
ic->ic_curchan = &ic->ic_channels[0];
/* 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);
/* override the 802.3 setting */
ifp->if_hdrlen = ic->ic_headroom
+ sizeof(struct ieee80211_qosframe_addr4)
+ IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN
+ IEEE80211_WEP_EXTIVLEN;
/* XXX no way to recalculate on ifdetach */
if (ALIGN(ifp->if_hdrlen) > max_linkhdr) {
/* XXX sanity check... */
max_linkhdr = ALIGN(ifp->if_hdrlen);
max_hdr = max_linkhdr + max_protohdr;
max_datalen = MHLEN - max_hdr;
}
/*
* 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 (ic->ic_caps & IEEE80211_C_BGSCAN) /* enable if capable */
ic->ic_flags |= IEEE80211_F_BGSCAN;
#if 0
/* XXX not until WME+WPA issues resolved */
if (ic->ic_caps & IEEE80211_C_WME) /* enable if capable */
ic->ic_flags |= IEEE80211_F_WME;
#endif
if (ic->ic_caps & IEEE80211_C_BURST)
ic->ic_flags |= IEEE80211_F_BURST;
ic->ic_flags |= IEEE80211_F_DOTH; /* XXX out of caps, just ena */
ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT;
ic->ic_bmissthreshold = IEEE80211_HWBMISS_DEFAULT;
ic->ic_dtim_period = IEEE80211_DTIM_DEFAULT;
IEEE80211_LOCK_INIT(ic, "ieee80211com");
IEEE80211_BEACON_LOCK_INIT(ic, "beacon");
ic->ic_lintval = ic->ic_bintval;
ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX;
ieee80211_crypto_attach(ic);
ieee80211_node_attach(ic);
ieee80211_power_attach(ic);
ieee80211_proto_attach(ic);
ieee80211_ht_attach(ic);
ieee80211_scan_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);
ieee80211_scan_detach(ic);
ieee80211_ht_detach(ic);
/* NB: must be called before ieee80211_node_detach */
ieee80211_proto_detach(ic);
ieee80211_crypto_detach(ic);
ieee80211_power_detach(ic);
ieee80211_node_detach(ic);
ifmedia_removeall(&ic->ic_media);
IEEE80211_LOCK_DESTROY(ic);
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)
{
#define IS_FREQ_IN_PSB(_freq) ((_freq) > 4940 && (_freq) < 4990)
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) {
/* XXX check regdomain? */
if (IS_FREQ_IN_PSB(freq))
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 (IS_FREQ_IN_PSB(freq))
return mappsb(freq, flags);
else if (freq > 4900)
return (freq - 4000) / 5;
else
return 15 + ((freq - 2512) / 20);
}
return (freq - 5000) / 5;
}
#undef IS_FREQ_IN_PSB
}
/*
* Convert channel to IEEE channel number.
*/
int
ieee80211_chan2ieee(struct ieee80211com *ic, const struct ieee80211_channel *c)
{
if (c == NULL) {
if_printf(ic->ic_ifp, "invalid channel (NULL)\n");
return 0; /* XXX */
}
return (c == IEEE80211_CHAN_ANYC ? IEEE80211_CHAN_ANY : c->ic_ieee);
}
/*
* 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);
}
}
/*
* Locate a channel given a frequency+flags. We cache
* the previous lookup to optimize swithing between two
* channels--as happens with dynamic turbo.
*/
struct ieee80211_channel *
ieee80211_find_channel(struct ieee80211com *ic, int freq, int flags)
{
struct ieee80211_channel *c;
int i;
flags &= IEEE80211_CHAN_ALLTURBO;
c = ic->ic_prevchan;
if (c != NULL && c->ic_freq == freq &&
(c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
return c;
/* brute force search */
for (i = 0; i < ic->ic_nchans; i++) {
c = &ic->ic_channels[i];
if (c->ic_freq == freq &&
(c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
return c;
}
return NULL;
}
static void
addmedia(struct ieee80211com *ic, int mode, int mword)
{
#define TURBO(m) ((m) | IFM_IEEE80211_TURBO)
#define ADD(_ic, _s, _o) \
ifmedia_add(&(_ic)->ic_media, \
IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL)
static const u_int mopts[IEEE80211_MODE_MAX] = {
IFM_AUTO, /* IEEE80211_MODE_AUTO */
IFM_IEEE80211_11A, /* IEEE80211_MODE_11A */
IFM_IEEE80211_11B, /* IEEE80211_MODE_11B */
IFM_IEEE80211_11G, /* IEEE80211_MODE_11G */
IFM_IEEE80211_FH, /* IEEE80211_MODE_FH */
TURBO(IFM_IEEE80211_11A), /* IEEE80211_MODE_TURBO_A */
TURBO(IFM_IEEE80211_11G), /* IEEE80211_MODE_TURBO_G */
TURBO(IFM_IEEE80211_11A), /* IEEE80211_MODE_STURBO_A */
IFM_IEEE80211_11NA, /* IEEE80211_MODE_11NA */
IFM_IEEE80211_11NG, /* IEEE80211_MODE_11NG */
};
u_int mopt;
KASSERT(mode < IEEE80211_MODE_MAX, ("bad mode %u", mode));
mopt = mopts[mode];
KASSERT(mopt != 0 || mode == IEEE80211_MODE_AUTO,
("no media mapping for mode %u", mode));
ADD(ic, mword, mopt); /* e.g. 11a auto */
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);
#undef ADD
#undef TURBO
}
/*
* 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)
{
struct ifnet *ifp = ic->ic_ifp;
int i, j, mode, rate, maxrate, mword, r;
const 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);
}
ieee80211_power_lateattach(ic);
/*
* Fill in media characteristics.
*/
ifmedia_init(&ic->ic_media, 0, media_change, media_stat);
maxrate = 0;
/*
* Add media for legacy operating modes.
*/
memset(&allrates, 0, sizeof(allrates));
for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_11NA; mode++) {
if (isclr(ic->ic_modecaps, mode))
continue;
addmedia(ic, mode, IFM_AUTO);
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;
addmedia(ic, mode, mword);
/*
* Add legacy 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;
/* NB: remove media options from mword */
addmedia(ic, IEEE80211_MODE_AUTO, IFM_SUBTYPE(mword));
}
/*
* Add HT/11n media. Note that we do not have enough
* bits in the media subtype to express the MCS so we
* use a "placeholder" media subtype and any fixed MCS
* must be specified with a different mechanism.
*/
for (; mode < IEEE80211_MODE_MAX; mode++) {
if (isclr(ic->ic_modecaps, mode))
continue;
addmedia(ic, mode, IFM_AUTO);
addmedia(ic, mode, IFM_IEEE80211_MCS);
}
if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) ||
isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) {
addmedia(ic, IEEE80211_MODE_AUTO, IFM_IEEE80211_MCS);
/* XXX could walk htrates */
/* XXX known array size */
if (ieee80211_htrates[15] > maxrate)
maxrate = ieee80211_htrates[15];
}
/* NB: strip explicit mode; we're actually in autoselect */
ifmedia_set(&ic->ic_media,
media_status(ic->ic_opmode, ic->ic_curchan) &~ IFM_MMASK);
if (maxrate)
ifp->if_baudrate = IF_Mbps(maxrate);
}
const struct ieee80211_rateset *
ieee80211_get_suprates(struct ieee80211com *ic, const struct ieee80211_channel *c)
{
if (IEEE80211_IS_CHAN_HALF(c))
return &ieee80211_rateset_half;
if (IEEE80211_IS_CHAN_QUARTER(c))
return &ieee80211_rateset_quarter;
if (IEEE80211_IS_CHAN_HTA(c))
return &ic->ic_sup_rates[IEEE80211_MODE_11A];
if (IEEE80211_IS_CHAN_HTG(c)) {
/* XXX does this work for basic rates? */
return &ic->ic_sup_rates[IEEE80211_MODE_11G];
}
return &ic->ic_sup_rates[ieee80211_chan2mode(c)];
}
void
ieee80211_announce(struct ieee80211com *ic)
{
struct ifnet *ifp = ic->ic_ifp;
int i, mode, rate, mword;
const struct ieee80211_rateset *rs;
for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_11NA; mode++) {
if (isclr(ic->ic_modecaps, mode))
continue;
if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]);
rs = &ic->ic_sup_rates[mode];
for (i = 0; i < rs->rs_nrates; i++) {
mword = ieee80211_rate2media(ic, rs->rs_rates[i], mode);
if (mword == 0)
continue;
rate = ieee80211_media2rate(mword);
printf("%s%d%sMbps", (i != 0 ? " " : ""),
rate / 2, ((rate & 0x1) != 0 ? ".5" : ""));
}
printf("\n");
}
ieee80211_ht_announce(ic);
}
void
ieee80211_announce_channels(struct ieee80211com *ic)
{
const struct ieee80211_channel *c;
char type;
int i, cw;
printf("Chan Freq CW RegPwr MinPwr MaxPwr\n");
for (i = 0; i < ic->ic_nchans; i++) {
c = &ic->ic_channels[i];
if (IEEE80211_IS_CHAN_ST(c))
type = 'S';
else if (IEEE80211_IS_CHAN_108A(c))
type = 'T';
else if (IEEE80211_IS_CHAN_108G(c))
type = 'G';
else if (IEEE80211_IS_CHAN_HT(c))
type = 'n';
else if (IEEE80211_IS_CHAN_A(c))
type = 'a';
else if (IEEE80211_IS_CHAN_ANYG(c))
type = 'g';
else if (IEEE80211_IS_CHAN_B(c))
type = 'b';
else
type = 'f';
if (IEEE80211_IS_CHAN_HT40(c) || IEEE80211_IS_CHAN_TURBO(c))
cw = 40;
else if (IEEE80211_IS_CHAN_HALF(c))
cw = 10;
else if (IEEE80211_IS_CHAN_QUARTER(c))
cw = 5;
else
cw = 20;
printf("%4d %4d%c %2d%c %6d %4d.%d %4d.%d\n"
, c->ic_ieee, c->ic_freq, type
, cw
, IEEE80211_IS_CHAN_HT40U(c) ? '+' :
IEEE80211_IS_CHAN_HT40D(c) ? '-' : ' '
, c->ic_maxregpower
, c->ic_minpower / 2, c->ic_minpower & 1 ? 5 : 0
, c->ic_maxpower / 2, c->ic_maxpower & 1 ? 5 : 0
);
}
}
/*
* Find an instance by it's mac address.
*/
struct ieee80211com *
ieee80211_find_vap(const uint8_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;
}
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
}
/*
* Convert a media specification to a rate index and possibly a mode
* (if the rate is fixed and the mode is specified as ``auto'' then
* we need to lock down the mode so the index is meanginful).
*/
static int
checkrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate)
{
/*
* Check the rate table for the specified/current phy.
*/
if (mode == IEEE80211_MODE_AUTO) {
int i;
/*
* In autoselect mode search for the rate.
*/
for (i = IEEE80211_MODE_11A; i < IEEE80211_MODE_MAX; i++) {
if (isset(ic->ic_modecaps, i) &&
findrate(ic, i, rate) != -1)
return 1;
}
return 0;
} else {
/*
* Mode is fixed, check for rate.
*/
return (findrate(ic, mode, rate) != -1);
}
}
/*
* 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 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_IEEE80211_11NA:
newphymode = IEEE80211_MODE_11NA;
break;
case IFM_IEEE80211_11NG:
newphymode = IEEE80211_MODE_11NG;
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) {
if (ic->ic_flags & IEEE80211_F_TURBOP)
newphymode = IEEE80211_MODE_TURBO_A;
else
newphymode = IEEE80211_MODE_STURBO_A;
} else if (newphymode == IEEE80211_MODE_11G)
newphymode = IEEE80211_MODE_TURBO_G;
else
return EINVAL;
}
/* XXX HT40 +/- */
/*
* Next, the fixed/variable rate.
*/
newrate = ic->ic_fixed_rate;
if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) {
/*
* Convert media subtype to rate.
*/
newrate = ieee80211_media2rate(ime->ifm_media);
if (newrate == 0 || !checkrate(ic, newphymode, newrate))
return EINVAL;
} else
newrate = IEEE80211_FIXED_RATE_NONE;
/*
* 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;
/*
* Handle phy mode change.
*/
if (ic->ic_des_mode != newphymode) { /* change phy mode */
ic->ic_des_mode = newphymode;
error = ENETRESET;
}
/*
* Committed to changes, install the rate setting.
*/
if (ic->ic_fixed_rate != newrate) {
ic->ic_fixed_rate = newrate; /* 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:
case IEEE80211_M_WDS:
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;
}
/*
* Common code to calculate the media status word
* from the operating mode and channel state.
*/
static int
media_status(enum ieee80211_opmode opmode, const struct ieee80211_channel *chan)
{
int status;
status = IFM_IEEE80211;
switch (opmode) {
case IEEE80211_M_STA:
break;
case IEEE80211_M_IBSS:
status |= IFM_IEEE80211_ADHOC;
break;
case IEEE80211_M_HOSTAP:
status |= IFM_IEEE80211_HOSTAP;
break;
case IEEE80211_M_MONITOR:
status |= IFM_IEEE80211_MONITOR;
break;
case IEEE80211_M_AHDEMO:
status |= IFM_IEEE80211_ADHOC | IFM_FLAG0;
break;
case IEEE80211_M_WDS:
/* should not come here */
break;
}
if (IEEE80211_IS_CHAN_HTA(chan)) {
status |= IFM_IEEE80211_11NA;
} else if (IEEE80211_IS_CHAN_HTG(chan)) {
status |= IFM_IEEE80211_11NG;
} else if (IEEE80211_IS_CHAN_A(chan)) {
status |= IFM_IEEE80211_11A;
} else if (IEEE80211_IS_CHAN_B(chan)) {
status |= IFM_IEEE80211_11B;
} else if (IEEE80211_IS_CHAN_ANYG(chan)) {
status |= IFM_IEEE80211_11G;
} else if (IEEE80211_IS_CHAN_FHSS(chan)) {
status |= IFM_IEEE80211_FH;
}
/* XXX else complain? */
if (IEEE80211_IS_CHAN_TURBO(chan))
status |= IFM_IEEE80211_TURBO;
if (IEEE80211_IS_CHAN_HT40U(chan))
status |= IFM_IEEE80211_HT40PLUS;
if (IEEE80211_IS_CHAN_HT40D(chan))
status |= IFM_IEEE80211_HT40MINUS;
return status;
}
void
ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr)
{
struct ieee80211com *ic;
enum ieee80211_phymode mode;
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;
/*
* NB: use the current channel's mode to lock down a xmit
* rate only when running; otherwise we may have a mismatch
* in which case the rate will not be convertible.
*/
if (ic->ic_state == IEEE80211_S_RUN) {
imr->ifm_status |= IFM_ACTIVE;
mode = ieee80211_chan2mode(ic->ic_curchan);
} else
mode = IEEE80211_MODE_AUTO;
imr->ifm_active = media_status(ic->ic_opmode, ic->ic_curchan);
/*
* Calculate a current rate if possible.
*/
if (ic->ic_fixed_rate != IEEE80211_FIXED_RATE_NONE) {
/*
* A fixed rate is set, report that.
*/
imr->ifm_active |= ieee80211_rate2media(ic,
ic->ic_fixed_rate, mode);
} else if (ic->ic_opmode == IEEE80211_M_STA) {
/*
* In station mode report the current transmit rate.
* XXX HT rate
*/
rs = &ic->ic_bss->ni_rates;
imr->ifm_active |= ieee80211_rate2media(ic,
rs->rs_rates[ic->ic_bss->ni_txrate], mode);
} else
imr->ifm_active |= IFM_AUTO;
}
/*
* 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)
{
/*
* 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);
ic->ic_curmode = mode;
ieee80211_reset_erp(ic); /* reset ERP state */
ieee80211_wme_initparams(ic); /* reset WME stat */
return 0;
}
/*
* Return the phy mode for with the specified channel.
*/
enum ieee80211_phymode
ieee80211_chan2mode(const struct ieee80211_channel *chan)
{
if (IEEE80211_IS_CHAN_HTA(chan))
return IEEE80211_MODE_11NA;
else if (IEEE80211_IS_CHAN_HTG(chan))
return IEEE80211_MODE_11NG;
else if (IEEE80211_IS_CHAN_108G(chan))
return IEEE80211_MODE_TURBO_G;
else if (IEEE80211_IS_CHAN_ST(chan))
return IEEE80211_MODE_STURBO_A;
else if (IEEE80211_IS_CHAN_TURBO(chan))
return IEEE80211_MODE_TURBO_A;
else if (IEEE80211_IS_CHAN_A(chan))
return IEEE80211_MODE_11A;
else if (IEEE80211_IS_CHAN_ANYG(chan))
return IEEE80211_MODE_11G;
else if (IEEE80211_IS_CHAN_B(chan))
return IEEE80211_MODE_11B;
else if (IEEE80211_IS_CHAN_FHSS(chan))
return IEEE80211_MODE_FH;
/* NB: should not get here */
printf("%s: cannot map channel to mode; freq %u flags 0x%x\n",
__func__, chan->ic_freq, chan->ic_flags);
return IEEE80211_MODE_11B;
}
struct ratemedia {
u_int match; /* rate + mode */
u_int media; /* if_media rate */
};
static int
findmedia(const struct ratemedia rates[], int n, u_int match)
{
int i;
for (i = 0; i < n; i++)
if (rates[i].match == match)
return rates[i].media;
return IFM_AUTO;
}
/*
* Convert IEEE80211 rate value to ifmedia subtype.
* Rate is either a legacy rate in units of 0.5Mbps
* or an MCS index.
*/
int
ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode)
{
#define N(a) (sizeof(a) / sizeof(a[0]))
static const struct ratemedia 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 */
};
static const struct ratemedia htrates[] = {
{ 0, IFM_IEEE80211_MCS },
{ 1, IFM_IEEE80211_MCS },
{ 2, IFM_IEEE80211_MCS },
{ 3, IFM_IEEE80211_MCS },
{ 4, IFM_IEEE80211_MCS },
{ 5, IFM_IEEE80211_MCS },
{ 6, IFM_IEEE80211_MCS },
{ 7, IFM_IEEE80211_MCS },
{ 8, IFM_IEEE80211_MCS },
{ 9, IFM_IEEE80211_MCS },
{ 10, IFM_IEEE80211_MCS },
{ 11, IFM_IEEE80211_MCS },
{ 12, IFM_IEEE80211_MCS },
{ 13, IFM_IEEE80211_MCS },
{ 14, IFM_IEEE80211_MCS },
{ 15, IFM_IEEE80211_MCS },
};
int m;
/*
* Check 11n rates first for match as an MCS.
*/
if (mode == IEEE80211_MODE_11NA) {
if ((rate & IEEE80211_RATE_BASIC) == 0) {
m = findmedia(htrates, N(htrates), rate);
if (m != IFM_AUTO)
return m | IFM_IEEE80211_11NA;
}
} else if (mode == IEEE80211_MODE_11NG) {
/* NB: 12 is ambiguous, it will be treated as an MCS */
if ((rate & IEEE80211_RATE_BASIC) == 0) {
m = findmedia(htrates, N(htrates), rate);
if (m != IFM_AUTO)
return m | IFM_IEEE80211_11NG;
}
}
rate &= IEEE80211_RATE_VAL;
switch (mode) {
case IEEE80211_MODE_11A:
case IEEE80211_MODE_11NA:
case IEEE80211_MODE_TURBO_A:
case IEEE80211_MODE_STURBO_A:
return findmedia(rates, N(rates), rate | IFM_IEEE80211_11A);
case IEEE80211_MODE_11B:
return findmedia(rates, N(rates), rate | IFM_IEEE80211_11B);
case IEEE80211_MODE_FH:
return findmedia(rates, N(rates), rate | IFM_IEEE80211_FH);
case IEEE80211_MODE_AUTO:
/* NB: ic may be NULL for some drivers */
if (ic && ic->ic_phytype == IEEE80211_T_FH)
return findmedia(rates, N(rates),
rate | IFM_IEEE80211_FH);
/* NB: hack, 11g matches both 11b+11a rates */
/* fall thru... */
case IEEE80211_MODE_11G:
case IEEE80211_MODE_11NG:
case IEEE80211_MODE_TURBO_G:
return findmedia(rates, N(rates), rate | IFM_IEEE80211_11G);
}
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 */
-1, /* IFM_IEEE80211_MCS */
};
return IFM_SUBTYPE(mword) < N(ieeerates) ?
ieeerates[IFM_SUBTYPE(mword)] : 0;
#undef N
}
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