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freebsd-dev/sys/net80211/ieee80211.c
Sam Leffler 6a76ae216e Add modes for 1/2 and 1/4-width channels so we have separate roaming 
and xmit parameters.  This makes it possible to use tdma on fractional
channels.
o add IEEE80211_MODE_HALF and IEEE80211_MODE_QUARTER; note these are
  band-agnostic (may need revisiting)
o setup all default rates in ic_sup_rates instead of doing it only
  for active modes; we need these to calculate the default tx parameters
  which are not recalculated after a regulatory update (can't just
  recalculate after installing a new channel list because we might
  clobber user settings)
o remove special case code in ieee80211_get_suprates; this is now
  a candidate for an inline or removal
o add various entries for new modes (roaming+tx params, wme, rate
  mapping, scan set setup, country ie construction, tdma, basic rates)

Note these modes are intentionally not visible through if_media.
2009-02-19 05:21:54 +00:00

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/*-
* Copyright (c) 2001 Atsushi Onoe
* Copyright (c) 2002-2009 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 "opt_wlan.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_types.h>
#include <net/ethernet.h>
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_regdomain.h>
#include <net/bpf.h>
const char *ieee80211_phymode_name[IEEE80211_MODE_MAX] = {
[IEEE80211_MODE_AUTO] = "auto",
[IEEE80211_MODE_11A] = "11a",
[IEEE80211_MODE_11B] = "11b",
[IEEE80211_MODE_11G] = "11g",
[IEEE80211_MODE_FH] = "FH",
[IEEE80211_MODE_TURBO_A] = "turboA",
[IEEE80211_MODE_TURBO_G] = "turboG",
[IEEE80211_MODE_STURBO_A] = "sturboA",
[IEEE80211_MODE_HALF] = "half",
[IEEE80211_MODE_QUARTER] = "quarter",
[IEEE80211_MODE_11NA] = "11na",
[IEEE80211_MODE_11NG] = "11ng",
};
/* map ieee80211_opmode to the corresponding capability bit */
const int ieee80211_opcap[IEEE80211_OPMODE_MAX] = {
[IEEE80211_M_IBSS] = IEEE80211_C_IBSS,
[IEEE80211_M_WDS] = IEEE80211_C_WDS,
[IEEE80211_M_STA] = IEEE80211_C_STA,
[IEEE80211_M_AHDEMO] = IEEE80211_C_AHDEMO,
[IEEE80211_M_HOSTAP] = IEEE80211_C_HOSTAP,
[IEEE80211_M_MONITOR] = IEEE80211_C_MONITOR,
};
static const uint8_t ieee80211broadcastaddr[IEEE80211_ADDR_LEN] =
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
static void ieee80211_syncflag_locked(struct ieee80211com *ic, int flag);
static void ieee80211_syncflag_ext_locked(struct ieee80211com *ic, int flag);
static int ieee80211_media_setup(struct ieee80211com *ic,
struct ifmedia *media, int caps, int addsta,
ifm_change_cb_t media_change, ifm_stat_cb_t media_stat);
static void ieee80211com_media_status(struct ifnet *, struct ifmediareq *);
static int ieee80211com_media_change(struct ifnet *);
static int media_status(enum ieee80211_opmode,
const struct ieee80211_channel *);
MALLOC_DEFINE(M_80211_VAP, "80211vap", "802.11 vap state");
/*
* 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
/*
* 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_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));
memset(ic->ic_modecaps, 0, sizeof(ic->ic_modecaps));
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"));
/*
* Help drivers that work only with frequencies by filling
* in IEEE channel #'s if not already calculated. Note this
* mimics similar work done in ieee80211_setregdomain when
* changing regulatory state.
*/
if (c->ic_ieee == 0)
c->ic_ieee = ieee80211_mhz2ieee(c->ic_freq,c->ic_flags);
if (IEEE80211_IS_CHAN_HT40(c) && c->ic_extieee == 0)
c->ic_extieee = ieee80211_mhz2ieee(c->ic_freq +
(IEEE80211_IS_CHAN_HT40U(c) ? 20 : -20),
c->ic_flags);
/* default max tx power to max regulatory */
if (c->ic_maxpower == 0)
c->ic_maxpower = 2*c->ic_maxregpower;
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_HALF(c))
setbit(ic->ic_modecaps, IEEE80211_MODE_HALF);
if (IEEE80211_IS_CHAN_QUARTER(c))
setbit(ic->ic_modecaps, IEEE80211_MODE_QUARTER);
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));
/* sort channel table to allow lookup optimizations */
ieee80211_sort_channels(ic->ic_channels, ic->ic_nchans);
/* invalidate any previous state */
ic->ic_bsschan = IEEE80211_CHAN_ANYC;
ic->ic_prevchan = NULL;
ic->ic_csa_newchan = NULL;
/* 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);
DEFAULTRATES(IEEE80211_MODE_STURBO_A, ieee80211_rateset_11a);
DEFAULTRATES(IEEE80211_MODE_HALF, ieee80211_rateset_half);
DEFAULTRATES(IEEE80211_MODE_QUARTER, ieee80211_rateset_quarter);
DEFAULTRATES(IEEE80211_MODE_11NA, ieee80211_rateset_11a);
DEFAULTRATES(IEEE80211_MODE_11NG, ieee80211_rateset_11g);
/*
* Set auto mode to reset active channel state and any desired channel.
*/
(void) ieee80211_setmode(ic, IEEE80211_MODE_AUTO);
#undef DEFAULTRATES
}
static void
null_update_mcast(struct ifnet *ifp)
{
if_printf(ifp, "need multicast update callback\n");
}
static void
null_update_promisc(struct ifnet *ifp)
{
if_printf(ifp, "need promiscuous mode update callback\n");
}
static int
null_output(struct ifnet *ifp, struct mbuf *m,
struct sockaddr *dst, struct rtentry *rt0)
{
if_printf(ifp, "discard raw packet\n");
m_freem(m);
return EIO;
}
static void
null_input(struct ifnet *ifp, struct mbuf *m)
{
if_printf(ifp, "if_input should not be called\n");
m_freem(m);
}
/*
* Attach/setup the common net80211 state. Called by
* the driver on attach to prior to creating any vap's.
*/
void
ieee80211_ifattach(struct ieee80211com *ic)
{
struct ifnet *ifp = ic->ic_ifp;
struct sockaddr_dl *sdl;
struct ifaddr *ifa;
KASSERT(ifp->if_type == IFT_IEEE80211, ("if_type %d", ifp->if_type));
IEEE80211_LOCK_INIT(ic, ifp->if_xname);
TAILQ_INIT(&ic->ic_vaps);
/*
* Fill in 802.11 available channel set, mark all
* available channels as active, and pick a default
* channel if not already specified.
*/
ieee80211_media_init(ic);
ic->ic_update_mcast = null_update_mcast;
ic->ic_update_promisc = null_update_promisc;
ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT;
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_regdomain_attach(ic);
ieee80211_sysctl_attach(ic);
ifp->if_addrlen = IEEE80211_ADDR_LEN;
ifp->if_hdrlen = 0;
if_attach(ifp);
ifp->if_mtu = IEEE80211_MTU_MAX;
ifp->if_broadcastaddr = ieee80211broadcastaddr;
ifp->if_output = null_output;
ifp->if_input = null_input; /* just in case */
ifp->if_resolvemulti = NULL; /* NB: callers check */
ifa = ifaddr_byindex(ifp->if_index);
KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
sdl->sdl_type = IFT_ETHER; /* XXX IFT_IEEE80211? */
sdl->sdl_alen = IEEE80211_ADDR_LEN;
IEEE80211_ADDR_COPY(LLADDR(sdl), ic->ic_myaddr);
}
/*
* Detach net80211 state on device detach. Tear down
* all vap's and reclaim all common state prior to the
* device state going away. Note we may call back into
* driver; it must be prepared for this.
*/
void
ieee80211_ifdetach(struct ieee80211com *ic)
{
struct ifnet *ifp = ic->ic_ifp;
struct ieee80211vap *vap;
while ((vap = TAILQ_FIRST(&ic->ic_vaps)) != NULL)
ieee80211_vap_destroy(vap);
ieee80211_waitfor_parent(ic);
ieee80211_sysctl_detach(ic);
ieee80211_regdomain_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);
if_detach(ifp);
}
/*
* 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
default_reset(struct ieee80211vap *vap, u_long cmd)
{
return ENETRESET;
}
/*
* Prepare a vap for use. Drivers use this call to
* setup net80211 state in new vap's prior attaching
* them with ieee80211_vap_attach (below).
*/
int
ieee80211_vap_setup(struct ieee80211com *ic, struct ieee80211vap *vap,
const char name[IFNAMSIZ], int unit, int opmode, int flags,
const uint8_t bssid[IEEE80211_ADDR_LEN],
const uint8_t macaddr[IEEE80211_ADDR_LEN])
{
struct ifnet *ifp;
ifp = if_alloc(IFT_ETHER);
if (ifp == NULL) {
if_printf(ic->ic_ifp, "%s: unable to allocate ifnet\n",
__func__);
return ENOMEM;
}
if_initname(ifp, name, unit);
ifp->if_softc = vap; /* back pointer */
ifp->if_flags = IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST;
ifp->if_start = ieee80211_start;
ifp->if_ioctl = ieee80211_ioctl;
ifp->if_watchdog = NULL; /* NB: no watchdog routine */
ifp->if_init = ieee80211_init;
/* NB: input+output filled in by ether_ifattach */
IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
IFQ_SET_READY(&ifp->if_snd);
vap->iv_ifp = ifp;
vap->iv_ic = ic;
vap->iv_flags = ic->ic_flags; /* propagate common flags */
vap->iv_flags_ext = ic->ic_flags_ext;
vap->iv_flags_ven = ic->ic_flags_ven;
vap->iv_caps = ic->ic_caps &~ IEEE80211_C_OPMODE;
vap->iv_htcaps = ic->ic_htcaps;
vap->iv_opmode = opmode;
vap->iv_caps |= ieee80211_opcap[opmode];
switch (opmode) {
case IEEE80211_M_WDS:
/*
* WDS links must specify the bssid of the far end.
* For legacy operation this is a static relationship.
* For non-legacy operation the station must associate
* and be authorized to pass traffic. Plumbing the
* vap to the proper node happens when the vap
* transitions to RUN state.
*/
IEEE80211_ADDR_COPY(vap->iv_des_bssid, bssid);
vap->iv_flags |= IEEE80211_F_DESBSSID;
if (flags & IEEE80211_CLONE_WDSLEGACY)
vap->iv_flags_ext |= IEEE80211_FEXT_WDSLEGACY;
break;
#ifdef IEEE80211_SUPPORT_TDMA
case IEEE80211_M_AHDEMO:
if (flags & IEEE80211_CLONE_TDMA) {
/* NB: checked before clone operation allowed */
KASSERT(ic->ic_caps & IEEE80211_C_TDMA,
("not TDMA capable, ic_caps 0x%x", ic->ic_caps));
/*
* Propagate TDMA capability to mark vap; this
* cannot be removed and is used to distinguish
* regular ahdemo operation from ahdemo+tdma.
*/
vap->iv_caps |= IEEE80211_C_TDMA;
}
break;
#endif
}
/* auto-enable s/w beacon miss support */
if (flags & IEEE80211_CLONE_NOBEACONS)
vap->iv_flags_ext |= IEEE80211_FEXT_SWBMISS;
/*
* Enable various functionality by default if we're
* capable; the driver can override us if it knows better.
*/
if (vap->iv_caps & IEEE80211_C_WME)
vap->iv_flags |= IEEE80211_F_WME;
if (vap->iv_caps & IEEE80211_C_BURST)
vap->iv_flags |= IEEE80211_F_BURST;
if (vap->iv_caps & IEEE80211_C_FF)
vap->iv_flags |= IEEE80211_F_FF;
if (vap->iv_caps & IEEE80211_C_TURBOP)
vap->iv_flags |= IEEE80211_F_TURBOP;
/* NB: bg scanning only makes sense for station mode right now */
if (vap->iv_opmode == IEEE80211_M_STA &&
(vap->iv_caps & IEEE80211_C_BGSCAN))
vap->iv_flags |= IEEE80211_F_BGSCAN;
vap->iv_flags |= IEEE80211_F_DOTH; /* XXX no cap, just ena */
/* NB: DFS support only makes sense for ap mode right now */
if (vap->iv_opmode == IEEE80211_M_HOSTAP &&
(vap->iv_caps & IEEE80211_C_DFS))
vap->iv_flags_ext |= IEEE80211_FEXT_DFS;
vap->iv_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */
vap->iv_bmissthreshold = IEEE80211_HWBMISS_DEFAULT;
vap->iv_dtim_period = IEEE80211_DTIM_DEFAULT;
/*
* Install a default reset method for the ioctl support;
* the driver can override this.
*/
vap->iv_reset = default_reset;
IEEE80211_ADDR_COPY(vap->iv_myaddr, macaddr);
ieee80211_sysctl_vattach(vap);
ieee80211_crypto_vattach(vap);
ieee80211_node_vattach(vap);
ieee80211_power_vattach(vap);
ieee80211_proto_vattach(vap);
ieee80211_ht_vattach(vap);
ieee80211_scan_vattach(vap);
ieee80211_regdomain_vattach(vap);
return 0;
}
/*
* Activate a vap. State should have been prepared with a
* call to ieee80211_vap_setup and by the driver. On return
* from this call the vap is ready for use.
*/
int
ieee80211_vap_attach(struct ieee80211vap *vap,
ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
{
struct ifnet *ifp = vap->iv_ifp;
struct ieee80211com *ic = vap->iv_ic;
struct ifmediareq imr;
int maxrate;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
"%s: %s parent %s flags 0x%x flags_ext 0x%x\n",
__func__, ieee80211_opmode_name[vap->iv_opmode],
ic->ic_ifp->if_xname, vap->iv_flags, vap->iv_flags_ext);
/*
* Do late attach work that cannot happen until after
* the driver has had a chance to override defaults.
*/
ieee80211_node_latevattach(vap);
ieee80211_power_latevattach(vap);
maxrate = ieee80211_media_setup(ic, &vap->iv_media, vap->iv_caps,
vap->iv_opmode == IEEE80211_M_STA, media_change, media_stat);
ieee80211_media_status(ifp, &imr);
/* NB: strip explicit mode; we're actually in autoselect */
ifmedia_set(&vap->iv_media,
imr.ifm_active &~ (IFM_MMASK | IFM_IEEE80211_TURBO));
if (maxrate)
ifp->if_baudrate = IF_Mbps(maxrate);
ether_ifattach(ifp, vap->iv_myaddr);
/* hook output method setup by ether_ifattach */
vap->iv_output = ifp->if_output;
ifp->if_output = ieee80211_output;
/* NB: if_mtu set by ether_ifattach to ETHERMTU */
bpfattach2(ifp, DLT_IEEE802_11, ifp->if_hdrlen, &vap->iv_rawbpf);
IEEE80211_LOCK(ic);
TAILQ_INSERT_TAIL(&ic->ic_vaps, vap, iv_next);
ieee80211_syncflag_locked(ic, IEEE80211_F_WME);
ieee80211_syncflag_locked(ic, IEEE80211_F_TURBOP);
ieee80211_syncflag_locked(ic, IEEE80211_F_PCF);
ieee80211_syncflag_locked(ic, IEEE80211_F_BURST);
ieee80211_syncflag_ext_locked(ic, IEEE80211_FEXT_HT);
ieee80211_syncflag_ext_locked(ic, IEEE80211_FEXT_USEHT40);
ieee80211_syncifflag_locked(ic, IFF_PROMISC);
ieee80211_syncifflag_locked(ic, IFF_ALLMULTI);
IEEE80211_UNLOCK(ic);
return 1;
}
/*
* Tear down vap state and reclaim the ifnet.
* The driver is assumed to have prepared for
* this; e.g. by turning off interrupts for the
* underlying device.
*/
void
ieee80211_vap_detach(struct ieee80211vap *vap)
{
struct ieee80211com *ic = vap->iv_ic;
struct ifnet *ifp = vap->iv_ifp;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s parent %s\n",
__func__, ieee80211_opmode_name[vap->iv_opmode],
ic->ic_ifp->if_xname);
IEEE80211_LOCK(ic);
/* block traffic from above */
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
/*
* Evil hack. Clear the backpointer from the ifnet to the
* vap so any requests from above will return an error or
* be ignored. In particular this short-circuits requests
* by the bridge to turn off promiscuous mode as a result
* of calling ether_ifdetach.
*/
ifp->if_softc = NULL;
/*
* Stop the vap before detaching the ifnet. Ideally we'd
* do this in the other order so the ifnet is inaccessible
* while we cleanup internal state but that is hard.
*/
ieee80211_stop_locked(vap);
TAILQ_REMOVE(&ic->ic_vaps, vap, iv_next);
ieee80211_syncflag_locked(ic, IEEE80211_F_WME);
ieee80211_syncflag_locked(ic, IEEE80211_F_TURBOP);
ieee80211_syncflag_locked(ic, IEEE80211_F_PCF);
ieee80211_syncflag_locked(ic, IEEE80211_F_BURST);
ieee80211_syncflag_ext_locked(ic, IEEE80211_FEXT_HT);
ieee80211_syncflag_ext_locked(ic, IEEE80211_FEXT_USEHT40);
ieee80211_syncifflag_locked(ic, IFF_PROMISC);
ieee80211_syncifflag_locked(ic, IFF_ALLMULTI);
IEEE80211_UNLOCK(ic);
/* XXX can't hold com lock */
/* NB: bpfattach is called by ether_ifdetach and claims all taps */
ether_ifdetach(ifp);
ifmedia_removeall(&vap->iv_media);
ieee80211_regdomain_vdetach(vap);
ieee80211_scan_vdetach(vap);
ieee80211_ht_vdetach(vap);
/* NB: must be before ieee80211_node_vdetach */
ieee80211_proto_vdetach(vap);
ieee80211_crypto_vdetach(vap);
ieee80211_power_vdetach(vap);
ieee80211_node_vdetach(vap);
ieee80211_sysctl_vdetach(vap);
if_free(ifp);
}
/*
* Synchronize flag bit state in the parent ifnet structure
* according to the state of all vap ifnet's. This is used,
* for example, to handle IFF_PROMISC and IFF_ALLMULTI.
*/
void
ieee80211_syncifflag_locked(struct ieee80211com *ic, int flag)
{
struct ifnet *ifp = ic->ic_ifp;
struct ieee80211vap *vap;
int bit, oflags;
IEEE80211_LOCK_ASSERT(ic);
bit = 0;
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
if (vap->iv_ifp->if_flags & flag) {
/*
* XXX the bridge sets PROMISC but we don't want to
* enable it on the device, discard here so all the
* drivers don't need to special-case it
*/
if (flag == IFF_PROMISC &&
vap->iv_opmode == IEEE80211_M_HOSTAP)
continue;
bit = 1;
break;
}
oflags = ifp->if_flags;
if (bit)
ifp->if_flags |= flag;
else
ifp->if_flags &= ~flag;
if ((ifp->if_flags ^ oflags) & flag) {
/* XXX should we return 1/0 and let caller do this? */
if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
if (flag == IFF_PROMISC)
ic->ic_update_promisc(ifp);
else if (flag == IFF_ALLMULTI)
ic->ic_update_mcast(ifp);
}
}
}
/*
* Synchronize flag bit state in the com structure
* according to the state of all vap's. This is used,
* for example, to handle state changes via ioctls.
*/
static void
ieee80211_syncflag_locked(struct ieee80211com *ic, int flag)
{
struct ieee80211vap *vap;
int bit;
IEEE80211_LOCK_ASSERT(ic);
bit = 0;
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
if (vap->iv_flags & flag) {
bit = 1;
break;
}
if (bit)
ic->ic_flags |= flag;
else
ic->ic_flags &= ~flag;
}
void
ieee80211_syncflag(struct ieee80211vap *vap, int flag)
{
struct ieee80211com *ic = vap->iv_ic;
IEEE80211_LOCK(ic);
if (flag < 0) {
flag = -flag;
vap->iv_flags &= ~flag;
} else
vap->iv_flags |= flag;
ieee80211_syncflag_locked(ic, flag);
IEEE80211_UNLOCK(ic);
}
/*
* Synchronize flag bit state in the com structure
* according to the state of all vap's. This is used,
* for example, to handle state changes via ioctls.
*/
static void
ieee80211_syncflag_ext_locked(struct ieee80211com *ic, int flag)
{
struct ieee80211vap *vap;
int bit;
IEEE80211_LOCK_ASSERT(ic);
bit = 0;
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
if (vap->iv_flags_ext & flag) {
bit = 1;
break;
}
if (bit)
ic->ic_flags_ext |= flag;
else
ic->ic_flags_ext &= ~flag;
}
void
ieee80211_syncflag_ext(struct ieee80211vap *vap, int flag)
{
struct ieee80211com *ic = vap->iv_ic;
IEEE80211_LOCK(ic);
if (flag < 0) {
flag = -flag;
vap->iv_flags_ext &= ~flag;
} else
vap->iv_flags_ext |= flag;
ieee80211_syncflag_ext_locked(ic, flag);
IEEE80211_UNLOCK(ic);
}
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 switching 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;
}
/*
* Locate a channel given a channel number+flags. We cache
* the previous lookup to optimize switching between two
* channels--as happens with dynamic turbo.
*/
struct ieee80211_channel *
ieee80211_find_channel_byieee(struct ieee80211com *ic, int ieee, int flags)
{
struct ieee80211_channel *c;
int i;
flags &= IEEE80211_CHAN_ALLTURBO;
c = ic->ic_prevchan;
if (c != NULL && c->ic_ieee == ieee &&
(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_ieee == ieee &&
(c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
return c;
}
return NULL;
}
static void
addmedia(struct ifmedia *media, int caps, int addsta, int mode, int mword)
{
#define ADD(_ic, _s, _o) \
ifmedia_add(media, \
IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL)
static const u_int mopts[IEEE80211_MODE_MAX] = {
[IEEE80211_MODE_AUTO] = IFM_AUTO,
[IEEE80211_MODE_11A] = IFM_IEEE80211_11A,
[IEEE80211_MODE_11B] = IFM_IEEE80211_11B,
[IEEE80211_MODE_11G] = IFM_IEEE80211_11G,
[IEEE80211_MODE_FH] = IFM_IEEE80211_FH,
[IEEE80211_MODE_TURBO_A] = IFM_IEEE80211_11A|IFM_IEEE80211_TURBO,
[IEEE80211_MODE_TURBO_G] = IFM_IEEE80211_11G|IFM_IEEE80211_TURBO,
[IEEE80211_MODE_STURBO_A] = IFM_IEEE80211_11A|IFM_IEEE80211_TURBO,
[IEEE80211_MODE_HALF] = IFM_IEEE80211_11A, /* XXX */
[IEEE80211_MODE_QUARTER] = IFM_IEEE80211_11A, /* XXX */
[IEEE80211_MODE_11NA] = IFM_IEEE80211_11NA,
[IEEE80211_MODE_11NG] = IFM_IEEE80211_11NG,
};
u_int mopt;
mopt = mopts[mode];
if (addsta)
ADD(ic, mword, mopt); /* STA mode has no cap */
if (caps & IEEE80211_C_IBSS)
ADD(media, mword, mopt | IFM_IEEE80211_ADHOC);
if (caps & IEEE80211_C_HOSTAP)
ADD(media, mword, mopt | IFM_IEEE80211_HOSTAP);
if (caps & IEEE80211_C_AHDEMO)
ADD(media, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
if (caps & IEEE80211_C_MONITOR)
ADD(media, mword, mopt | IFM_IEEE80211_MONITOR);
if (caps & IEEE80211_C_WDS)
ADD(media, mword, mopt | IFM_IEEE80211_WDS);
#undef ADD
}
/*
* Setup the media data structures according to the channel and
* rate tables.
*/
static int
ieee80211_media_setup(struct ieee80211com *ic,
struct ifmedia *media, int caps, int addsta,
ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
{
int i, j, mode, rate, maxrate, mword, r;
const struct ieee80211_rateset *rs;
struct ieee80211_rateset allrates;
/*
* Fill in media characteristics.
*/
ifmedia_init(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(media, caps, addsta, 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(media, caps, addsta, 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(media, caps, addsta,
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_11NG; mode++) {
if (isclr(ic->ic_modecaps, mode))
continue;
addmedia(media, caps, addsta, mode, IFM_AUTO);
addmedia(media, caps, addsta, mode, IFM_IEEE80211_MCS);
}
if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) ||
isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) {
addmedia(media, caps, addsta,
IEEE80211_MODE_AUTO, IFM_IEEE80211_MCS);
/* XXX could walk htrates */
/* XXX known array size */
if (ieee80211_htrates[15].ht40_rate_400ns > maxrate)
maxrate = ieee80211_htrates[15].ht40_rate_400ns;
}
return maxrate;
}
void
ieee80211_media_init(struct ieee80211com *ic)
{
struct ifnet *ifp = ic->ic_ifp;
int maxrate;
/* NB: this works because the structure is initialized to zero */
if (!LIST_EMPTY(&ic->ic_media.ifm_list)) {
/*
* 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);
/*
* Recalculate media settings in case new channel list changes
* the set of available modes.
*/
maxrate = ieee80211_media_setup(ic, &ic->ic_media, ic->ic_caps, 1,
ieee80211com_media_change, ieee80211com_media_status);
/* NB: strip explicit mode; we're actually in autoselect */
ifmedia_set(&ic->ic_media,
media_status(ic->ic_opmode, ic->ic_curchan) &~
(IFM_MMASK | IFM_IEEE80211_TURBO));
if (maxrate)
ifp->if_baudrate = IF_Mbps(maxrate);
/* XXX need to propagate new media settings to vap's */
}
/* XXX inline or eliminate? */
const struct ieee80211_rateset *
ieee80211_get_suprates(struct ieee80211com *ic, const struct ieee80211_channel *c)
{
/* XXX does this work for 11ng basic rates? */
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;
/* NB: skip AUTO since it has no rates */
for (mode = IEEE80211_MODE_AUTO+1; 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
);
}
}
static int
media2mode(const struct ifmedia_entry *ime, uint32_t flags, uint16_t *mode)
{
switch (IFM_MODE(ime->ifm_media)) {
case IFM_IEEE80211_11A:
*mode = IEEE80211_MODE_11A;
break;
case IFM_IEEE80211_11B:
*mode = IEEE80211_MODE_11B;
break;
case IFM_IEEE80211_11G:
*mode = IEEE80211_MODE_11G;
break;
case IFM_IEEE80211_FH:
*mode = IEEE80211_MODE_FH;
break;
case IFM_IEEE80211_11NA:
*mode = IEEE80211_MODE_11NA;
break;
case IFM_IEEE80211_11NG:
*mode = IEEE80211_MODE_11NG;
break;
case IFM_AUTO:
*mode = IEEE80211_MODE_AUTO;
break;
default:
return 0;
}
/*
* Turbo mode is an ``option''.
* XXX does not apply to AUTO
*/
if (ime->ifm_media & IFM_IEEE80211_TURBO) {
if (*mode == IEEE80211_MODE_11A) {
if (flags & IEEE80211_F_TURBOP)
*mode = IEEE80211_MODE_TURBO_A;
else
*mode = IEEE80211_MODE_STURBO_A;
} else if (*mode == IEEE80211_MODE_11G)
*mode = IEEE80211_MODE_TURBO_G;
else
return 0;
}
/* XXX HT40 +/- */
return 1;
}
/*
* Handle a media change request on the underlying interface.
*/
int
ieee80211com_media_change(struct ifnet *ifp)
{
return EINVAL;
}
/*
* Handle a media change request on the vap interface.
*/
int
ieee80211_media_change(struct ifnet *ifp)
{
struct ieee80211vap *vap = ifp->if_softc;
struct ifmedia_entry *ime = vap->iv_media.ifm_cur;
uint16_t newmode;
if (!media2mode(ime, vap->iv_flags, &newmode))
return EINVAL;
if (vap->iv_des_mode != newmode) {
vap->iv_des_mode = newmode;
return ENETRESET;
}
return 0;
}
/*
* 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:
status |= IFM_IEEE80211_WDS;
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 0
if (IEEE80211_IS_CHAN_HT20(chan))
status |= IFM_IEEE80211_HT20;
if (IEEE80211_IS_CHAN_HT40(chan))
status |= IFM_IEEE80211_HT40;
#endif
return status;
}
static void
ieee80211com_media_status(struct ifnet *ifp, struct ifmediareq *imr)
{
struct ieee80211com *ic = ifp->if_l2com;
struct ieee80211vap *vap;
imr->ifm_status = IFM_AVALID;
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
if (vap->iv_ifp->if_flags & IFF_UP) {
imr->ifm_status |= IFM_ACTIVE;
break;
}
imr->ifm_active = media_status(ic->ic_opmode, ic->ic_curchan);
if (imr->ifm_status & IFM_ACTIVE)
imr->ifm_current = imr->ifm_active;
}
void
ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr)
{
struct ieee80211vap *vap = ifp->if_softc;
struct ieee80211com *ic = vap->iv_ic;
enum ieee80211_phymode mode;
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 (vap->iv_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(vap->iv_opmode, ic->ic_curchan);
/*
* Calculate a current rate if possible.
*/
if (vap->iv_txparms[mode].ucastrate != IEEE80211_FIXED_RATE_NONE) {
/*
* A fixed rate is set, report that.
*/
imr->ifm_active |= ieee80211_rate2media(ic,
vap->iv_txparms[mode].ucastrate, mode);
} else if (vap->iv_opmode == IEEE80211_M_STA) {
/*
* In station mode report the current transmit rate.
*/
imr->ifm_active |= ieee80211_rate2media(ic,
vap->iv_bss->ni_txrate, mode);
} else
imr->ifm_active |= IFM_AUTO;
if (imr->ifm_status & IFM_ACTIVE)
imr->ifm_current = imr->ifm_active;
}
/*
* 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_setbasicrates(&ic->ic_sup_rates[mode], mode);
ic->ic_curmode = mode;
ieee80211_reset_erp(ic); /* reset ERP state */
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_HALF(chan))
return IEEE80211_MODE_HALF;
else if (IEEE80211_IS_CHAN_QUARTER(chan))
return IEEE80211_MODE_QUARTER;
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_MCS) {
rate &= ~IEEE80211_RATE_MCS;
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_MCS) {
rate &= ~IEEE80211_RATE_MCS;
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_HALF: /* XXX good 'nuf */
case IEEE80211_MODE_QUARTER:
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 != NULL && 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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