Партнёры:
Хостинг:
ieee80211_node_attach ieee80211_node_lateattach ieee80211_node_detach ieee80211_begin_scan ieee80211_next_scan ieee80211_create_ibss ieee80211_end_scan ieee80211_alloc_node ieee80211_dup_bss ieee80211_find_node ieee80211_lookup_node ieee80211_free_node ieee80211_free_allnodes ieee80211_timeout_nodes ieee80211_iterate_nodes - software 802.11 stack node management functions
The
ieee80211_node_attach ();
function is called from
ieee80211_ifattach9
to initialize node database management callbacks for the interface
Fa ifp
(specifically for memory allocation, node copying and node
signal inspection).
These functions may be overridden in special circumstances,
as long as this is done after calling
ieee80211_ifattach9
and prior to any other call which may allocate a node.
The
ieee80211_node_lateattach ();
function initialises the
ic_bss
node element of the interface
Fa ifp
during
ieee80211_media_init9.
This late attachment is to account for certain special cases described under
ieee80211_node_attach (.);
The
ieee80211_node_detach ();
function destroys all node database state associated with the interface
Fa ifp ,
and is usually called during device detach.
The
ieee80211_begin_scan ();
function initialises the node database in preparation of an active
scan for an access point on the interface
Fa ifp .
The scan begins on the next radio channel by calling
ieee80211_next_scan ();
internally.
The actual scanning for an access point is not automated;
the device driver itself only handles setting the radio frequency
of the card and stepping through the channels.
The
ieee80211_next_scan ();
function is used to inform the
ieee80211(9)
layer that the interface
Fa ifp
is now scanning for an access point on the next radio channel.
A device driver is expected to first call
ieee80211_begin_scan (,);
to initialize the node database,
then set the radio channel on the device;
then, after a certain time has elapsed (200ms for example), call
ieee80211_next_scan ();
to move to the next channel.
Typically, a callout is used to automate this process; see
callout_init9
for more information on how to use callouts.
The
ieee80211_create_ibss ();
function sets up the net80211-specific portion of an interface's softc,
Fa ic ,
for use in IBSS mode.
The
ieee80211_end_scan ();
function is called by
ieee80211_next_scan ();
when the state machine has peformed a full cycle of scanning on
all available radio channels.
Internally,
ieee80211_end_scan ();
will inspect the node cache associated with the interface
Fa ifp
for suitable access points found during scanning, and associate with one,
should the parameters of the node match those of the configuration
requested from userland.
The
ieee80211_alloc_node ();
function allocates an instance of
Vt struct ieee80211_node
for a node having the MAC address
Fa macaddr ,
and associates it with the interface
Fa ic .
If the allocation is successful, the node structure is initialised by
ieee80211_setup_node (;);
otherwise,
NULL
is returned.
The
ieee80211_dup_bss ();
function is similar to
ieee80211_alloc_node (,);
but is instead used to create a node database entry for the BSSID
Fa macaddr
associated with the interface
Fa ic .
If the allocation is successful, the node structure is initialised by
ieee80211_setup_node (;);
otherwise,
NULL
is returned.
The
ieee80211_find_node ();
function will iterate through the node list associated with the interface
Fa ic ,
searching for a node entry which matches
Fa macaddr .
If the entry is found, its reference count is incremented, and
a pointer to the node is returned; otherwise,
NULL
will be returned.
The
ieee80211_lookup_node ();
function is similar to
ieee80211_find_node (,);
with an additional argument
Fa chan
which is used to specify a channel for the match.
If the entry is found, its reference count is incremented, and
a pointer to the node is returned; otherwise,
NULL
will be returned.
The
ieee80211_free_node ();
function will remove the node
Fa ni
from the node database entries associated with the interface
Fa ic ,
and free any memory associated with the node.
This private method can be overridden in
ieee80211_node_attach (.);
The
ieee80211_free_allnodes ();
function will iterate through the node list calling
ieee80211_free_node ();
for all nodes associated with the interface
Fa ic .
The
ieee80211_timeout_nodes ();
checks if the inactivity timer of each node associated with the interface
Fa ic
has exceeded the pre-defined constant
IEEE80211_INACT_MAX
If so, then the node is freed, after sending a deauthentication message.
The
ieee80211_iterate_nodes ();
function will call the user-defined callback function
Fa f
for all nodes in the node database associated with the interface
Fa ic .
The callback is invoked with the with the user-supplied value
Fa arg
and a pointer to the current node.
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