ieee80211_media_init(9) - NetBSD Manual Pages

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IEEE80211(9)           NetBSD Kernel Developer's Manual           IEEE80211(9)


NAME

     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


SYNOPSIS

     #include <net80211/ieee80211_var.h>
     #include <net80211/ieee80211_proto.h>

     void
     ieee80211_ifattach(struct ieee80211com *ic);

     void
     ieee80211_ifdetach(struct ieee80211com *ic);

     u_int
     ieee80211_mhz2ieee(u_int freq, u_int flags);

     u_int
     ieee80211_chan2ieee(struct ieee80211com *ic,
         struct ieee80211_channel *c);

     u_int
     ieee80211_ieee2mhz(u_int chan, u_int flags);

     void
     ieee80211_media_init(struct ieee80211com *ic,
         ifm_change_cb_t media_change, ifm_stat_cb_t media_stat);

     int
     ieee80211_media_change(struct ifnet *ifp);

     void
     ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr);

     void
     ieee80211_watchdog(struct ieee80211com *ic);

     int
     ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode);

     enum ieee80211_phymode
     ieee80211_chan2mode(struct ieee80211com *ic,
         struct ieee80211_channel *chan);

     int
     ieee80211_rate2media(struct ieee80211com *ic, int rate,
         enum ieee80211_phymode mode);

     int
     ieee80211_media2rate(int mword);


DESCRIPTION

     The ieee80211 collection of functions are used to manage wireless network
     interfaces in the system which use the system's software 802.11 network
     stack.  Most of these functions require that attachment to the stack is
     performed before calling.  Several utility functions are also provided;
     these are safe to call from any driver without prior initialization.

     The ieee80211_ifattach() function attaches the wireless network interface
     ic 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.  This function also performs Ethernet and BPF
     attachment (by calling ether_ifattach() and bpfattach2()) on behalf of
     the caller.

     The ieee80211_ifdetach() function frees any ieee80211 structures associ-
     ated with the driver, and performs Ethernet and BPF detachment on behalf
     of the caller.

     The ieee80211_mhz2ieee() utility function converts the frequency freq
     (specified in MHz) to an IEEE 802.11 channel number.  The flags argument
     is a hint which specifies whether the frequency is in the 2GHz ISM band
     (IEEE80211_CHAN_2GHZ) or the 5GHz band (IEEE80211_CHAN_5GHZ); appropriate
     clipping of the result is then performed.

     The ieee80211_chan2ieee() function converts the channel specified in *c
     to an IEEE channel number for the driver ic.  If the conversion would be
     invalid, an error message is printed to the system console.  This func-
     tion REQUIRES that the driver is hooked up to the ieee80211 subsystem.

     The ieee80211_ieee2mhz() utility function converts the IEEE channel num-
     ber chan to a frequency (in MHz).  The flags argument is a hint which
     specifies whether the frequency is in the 2GHz ISM band
     (IEEE80211_CHAN_2GHZ) or the 5GHz band (IEEE80211_CHAN_5GHZ); appropriate
     clipping of the result is then performed.

     The ieee80211_media_init() function initializes media data structures
     used by the ifmedia interface for the driver ic.  It must be called by
     the driver after calling ieee80211_ifattach() and before calling most
     ieee80211 functions.  The media_change and media_stat arguments specify
     helper functions which will be invoked by the 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 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 chan on the device 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 rate (measured
     in units of 0.5Mbps) to an ifmedia sub-type, for the device ic running in
     PHY mode mode.  The ieee80211_media2rate() performs the reverse of this
     conversion, returning the bit rate (in 0.5Mbps units) corresponding to an
     ifmedia sub-type.


SEE ALSO

     ieee80211_crypto(9), ieee80211_input(9), ieee80211_ioctl(9),
     ieee80211_node(9), ieee80211_output(9), ieee80211_proto(9),
     ieee80211_radiotap(9)


HISTORY

     The ieee80211 series of functions first appeared in NetBSD 1.5, and were
     later ported to FreeBSD 4.6.


AUTHORS

     This man page was written by Bruce M. Simpson <bms@FreeBSD.org> and
     Darron Broad <darron@kewl.org>.

NetBSD 5.1                    September 12, 2006                    NetBSD 5.1