IEEE80211_NODE(9) BSD Kernel Developer's Manual IEEE80211_NODE(9)NAME
ieee80211_node_attach, ieee80211_node_lateattach, ieee80211_node_detach,
ieee80211_begin_scan, ieee80211_next_scan, ieee80211_end_scan,
ieee80211_create_ibss, ieee80211_alloc_node, ieee80211_dup_bss,
ieee80211_find_node, ieee80211_free_node, ieee80211_free_allnodes,
ieee80211_iterate_nodes — software 802.11 stack node management functions
SYNOPSIS
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_proto.h>
#include <net80211/ieee80211_node.h>
void
ieee80211_node_attach(struct ieee80211com *ic);
void
ieee80211_node_lateattach(struct ieee80211com *ic);
void
ieee80211_node_detach(struct ieee80211com *ic);
void
ieee80211_begin_scan(struct ieee80211com *ic, int reset);
void
ieee80211_next_scan(struct ieee80211com *ic);
void
ieee80211_end_scan(struct ieee80211com *ic);
void
ieee80211_create_ibss(struct ieee80211com *ic,
struct ieee80211_channel *chan);
struct ieee80211_node *
ieee80211_alloc_node(struct ieee80211com *ic, u_int8_t *macaddr);
struct ieee80211_node *
ieee80211_dup_bss(struct ieee80211_node_table *nt,
const u_int8_t *macaddr);
struct ieee80211_node *
ieee80211_find_node(struct ieee80211_node_table *nt,
const u_int8_t *macaddr);
void
ieee80211_free_node(struct ieee80211_node *ni);
void
ieee80211_free_allnodes(struct ieee80211_node_table *nt);
void
ieee80211_iterate_nodes(struct ieee80211_node_table *nt,
ieee80211_iter_func *f, void *arg);
DESCRIPTION
These functions are used to manage node lists within the software 802.11
stack. These lists are typically used for implementing host-mode AP
functionality, or providing signal quality information about neighbouring
nodes.
The ieee80211_node_attach() function is called from ieee80211_ifattach(9)
to initialize node database management callbacks for the interface ic
(specifically for memory allocation, node copying and node signal inspec‐
tion). These functions may be overridden in special circumstances, as
long as this is done after calling ieee80211_ifattach(9) and prior to any
other call which may allocate a node.
The ieee80211_node_lateattach() function initialises the ic_bss node ele‐
ment of the interface ic during ieee80211_media_init(9). 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 ic, and is usually called during device
detach.
The ieee80211_begin_scan() function initialises the node database in
preparation of a scan for an access point on the interface ic and begins
the scan. The parameter reset controls if a previously built node list
should be cleared. The actual scanning for an access point is not fully
automated: the device driver itself controls stepping through the chan‐
nels, usually by a periodical callback.
The ieee80211_next_scan() function is used to inform the ieee80211(9)
layer that the next channel for interface ic should be scanned.
The ieee80211_create_ibss() function sets up the net80211-specific por‐
tion of an interface's softc, 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 ic for suitable access points found
during scanning, and associate with one, should the parameters of the
node match those of the configuration requested.
The ieee80211_alloc_node() function allocates an instance of struct
ieee80211_node for a node having the MAC address macaddr, and associates
it with the node table nt. 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 macaddr
associated with the note table nt. 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 table
nt, searching for a node entry which matches macaddr. If the entry is
found, its reference count is incremented, and a pointer to the node is
returned; otherwise, NULL is returned.
The ieee80211_free_allnodes() function will iterate through the node list
calling ieee80211_free_node() for all the nodes in table nt.
The ieee80211_iterate_nodes() function will call the user-defined call‐
back function f for all nodes in the table nt. The callback is invoked
with the with the user-supplied value arg and a pointer to the current
node.
SEE ALSOieee80211(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⟩.
BSD September 12, 2006 BSD
