ieee80211_output(9)

NAME

ieee80211_encap, ieee80211_add_rates, ieee80211_add_xrates, ieee80211_send_mgmt - software 802.11 stack output functions

SYNOPSIS

#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_proto.h>
struct mbuf *
ieee80211_encap(struct ifnet *ifp, struct mbuf *m,
        struct ieee80211_node **pni);
u_int8_t *
ieee80211_add_rates(u_int8_t      *frm,     const     struct
ieee80211_rateset *rs);
u_int8_t *
ieee80211_add_xrates(u_int8_t     *frm,     const     struct
ieee80211_rateset *rs);
int
ieee80211_send_mgmt(struct    ieee80211com    *ic,    struct
ieee80211_node *ni,
        int type, int arg);

DESCRIPTION

These functions handle the encapsulation and transmission of

802.11
frames within the software 802.11 stack.

The ieee80211_encap() function encapsulates an outbound data

frame contained within the mbuf chain m from the interface ifp. The

argument *pni
is a reference to the destination node.

If the function is successful, the mbuf chain is updated

with the 802.11
frame header prepended, and a pointer to the head of the

chain is
returned. If an error occurs, NULL will be returned, and

*pni is also
set to NULL. The caller is responsible for freeing the node

reference if
*pni is non-NULL on return. The convention is that ic_bss

is not reference counted; the caller is responsible for maintaining this

reference
count.

The ieee80211_add_rates() utility function is used to add

the rate set
element *rs to the frame frm. A pointer to the location in

the buffer
after the addition of the rate set is returned. It is typi

cally used
when constructing management frames from within the software

802.11
stack.

The ieee80211_add_xrates() utility function is used to add

the extended
rate set element *rs to the frame frm. A pointer to the lo

cation in the
buffer after the addition of the rate set is returned. It

is typically
used when constructing management frames from within the

software 802.11
stack in 802.11g mode.

The ieee80211_send_mgmt() function transmits a management

frame on the
interface ic to the destination node ni of type type.

The argument arg specifies either a sequence number for au

thentication
operations, a status code for [re]association operations, or

a reason for
deauthentication and deassociation operations.

Nodes other than ic_bss have their reference count incre

mented to reflect
their use for an indeterminate amount of time. This refer

ence is freed
when the function returns.

The function returns 0 if successful; if temporary buffer

space is not
available, the function returns ENOMEM.

SEE ALSO

ieee80211(9), ifnet(9)

HISTORY

The ieee80211 series of functions first appeared in NetBSD

1.5, and were
later ported to FreeBSD 4.6.

AUTHORS

This manual page was written by Bruce M. Simpson <bms@FreeB

SD.org> and
Darron Broad <darron@kewl.org>.

BSD March 2, 2004

BSD