Партнёры:
Хостинг:
ieee80211_ifattach , ieee80211_ifdetach ieee80211_mhz2ieee , ieee80211_chan2ieee , ieee80211_ieee2mhz ieee80211_media_init , ieee80211_media_change , ieee80211_media_status ieee80211_watchdog ieee80211_setmode , ieee80211_chan2mode ieee80211_rate2media , ieee80211_media2rate - core 802.11 network stack functions
The
ieee80211_ifattach ();
function attaches the network interface
Fa ifp
to the 802.11 network stack layer.
This function must be called before using any of the
ieee80211
functions which need to store driver state across invocations;
The
Vt struct ifnet
instance pointed to by
Fa ifp
MUST be an instance of
Vt struct ieee80211com ,
with various fields initialized to tell
ieee80211
about its capabilities.
This function performs Ethernet and BPF attachment (by calling
ether_ifattach ();
and
bpfattach2 ());
on behalf of the caller.
It also implements the
Vt ifmedia
interface.
The
ieee80211_ifdetach ();
function frees any
ieee80211
structures associated with the driver, and performs Ethernet and BPF
detachment on behalf of the caller.
The
ieee80211_mhz2ieee ();
utility function converts the frequency
Fa freq
(specified in MHz) to an IEEE 802.11 channel number.
The
Fa flags
argument is a hint which specifies whether the frequency is in
the 2GHz ISM band
(Vt IEEE80211_CHAN_2GHZ
)
or the 5GHz band
(Vt IEEE80211_CHAN_5GHZ
)
appropriate clipping of the result is then performed.
The
ieee80211_chan2ieee ();
function converts the channel specified in
Fa *c
to an IEEE channel number for the driver
Fa ic .
If the conversion would be invalid, an error message is printed to the
system console.
This function REQUIRES that the driver is hooked up to the
ieee80211
subsystem.
The
ieee80211_ieee2mhz ();
utility function converts the IEEE channel number
chan
to a frequency (in MHz).
The
Fa flags
argument is a hint which specifies whether the frequency is in
the 2GHz ISM band
(Vt IEEE80211_CHAN_2GHZ
)
or the 5GHz band
(Vt IEEE80211_CHAN_5GHZ
)
appropriate clipping of the result is then performed.
The
ieee80211_media_init ();
function initializes media data structures used by the
Vt ifmedia
interface, for the driver
Fa ifp .
It must be called by the driver after calling
ieee80211_attach ();
and before calling most
ieee80211
functions.
The
Fa media_change
and
Fa media_stat
arguments specify helper functions which will be invoked by the
Vt ifmedia
framework when the user changes or queries media options,
using a command such as
ifconfig(8).
The
ieee80211_media_status ();
and
ieee80211_media_change ();
functions are device-independent handlers for
Vt ifmedia
commands and are not intended to be called directly.
The
ieee80211_watchdog ();
function is intended to be called from a driver's
if_watchdog
routine.
It is used to perform periodic cleanup of state within the software 802.11
stack, as well as timing out scans.
The
ieee80211_setmode ();
function is called from within the 802.11 stack to change the mode
of the driver's PHY; it is not intended to be called directly.
The
ieee80211_chan2mode ();
function returns the PHY mode required for use with the channel
Fa chan
on the device
Fa ic .
This is typically used when selecting a rate set, to be advertised in
beacons, for example.
The
ieee80211_rate2media ();
function converts the bit rate
Fa rate
(measured in units of 0.5Mbps) to an
Vt ifmedia
sub-type, for the device
Fa ic
running in PHY mode
Fa mode .
The
ieee80211_media2rate ();
performs the reverse of this conversion, returning the bit rate (in 0.5Mbps
units) corresponding to an
Vt ifmedia
sub-type.
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