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152 lines
4.5 KiB
Groff
152 lines
4.5 KiB
Groff
.\"
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.\" Copyright (c) 2004 Bruce M. Simpson <bms@spc.org>
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.\" Copyright (c) 2004 Darron Broad <darron@kewl.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\" $Id: ieee80211_output.9,v 1.5 2004/03/04 12:31:18 bruce Exp $
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.\"
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.Dd March 2, 2004
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.Dt IEEE80211_OUTPUT 9
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.Os
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.Sh NAME
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.Nm ieee80211_encap , ieee80211_add_rates ,
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.Nm ieee80211_add_xrates , ieee80211_send_mgmt
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.Nd software 802.11 stack output functions
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.Sh SYNOPSIS
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.In net80211/ieee80211_var.h
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.In net80211/ieee80211_proto.h
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.Ft struct mbuf *
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.Fo ieee80211_encap
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.Fa "struct ifnet *ifp" "struct mbuf *m" "struct ieee80211_node **pni"
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.Fc
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.Ft u_int8_t *
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.Fn ieee80211_add_rates "u_int8_t *frm" "const struct ieee80211_rateset *rs"
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.Ft u_int8_t *
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.Fn ieee80211_add_xrates "u_int8_t *frm" "const struct ieee80211_rateset *rs"
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.Ft int
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.Fo ieee80211_send_mgmt
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.Fa "struct ieee80211com *ic" "struct ieee80211_node *ni" "int type" "int arg"
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.Fc
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.Sh DESCRIPTION
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These functions handle the encapsulation and transmission of 802.11 frames
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within the software 802.11 stack.
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.Pp
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The
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.Fn ieee80211_encap
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function encapsulates an outbound data frame contained within the
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mbuf chain
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.Fa m
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from the interface
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.Fa ifp .
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The argument
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.Fa *pni
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is a reference to the destination node.
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.Pp
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If the function is successful, the mbuf chain is updated with the
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802.11 frame header prepended, and a pointer to the head of the chain
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is returned.
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If an error occurs,
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.Dv NULL
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will be returned, and
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.Fa *pni
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is also set to
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.Dv NULL .
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The caller is responsible for freeing the node reference if
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.Fa *pni
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is
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.Pf non- Dv NULL
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on return.
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The convention is that
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.Va ic_bss
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is not reference counted; the caller is responsible for maintaining this
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reference count.
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.Pp
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.\"
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The
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.Fn ieee80211_add_rates
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utility function is used to add the rate set element
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.Fa *rs
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to the frame
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.Fa frm .
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A pointer to the location in the buffer after the addition of the rate set
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is returned.
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It is typically used when constructing management frames from within the
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software 802.11 stack.
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.Pp
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.\"
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The
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.Fn ieee80211_add_xrates
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utility function is used to add the extended rate set element
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.Fa *rs
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to the frame
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.Fa frm .
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A pointer to the location in the buffer after the addition of the rate set
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is returned.
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It is typically used when constructing management frames from within the
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software 802.11 stack in 802.11g mode.
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.Pp
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.\"
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The
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.Fn ieee80211_send_mgmt
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function transmits a management frame on the interface
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.Fa ic
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to the destination node
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.Fa ni
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of type
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.Fa type .
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.Pp
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The argument
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.Fa arg
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specifies either a sequence number for authentication operations,
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a status code for [re]association operations,
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or a reason for deauthentication and deassociation operations.
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.Pp
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Nodes other than
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.Va ic_bss
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have their reference count incremented to reflect their use for an
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indeterminate amount of time.
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This reference is freed when the function returns.
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.Pp
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The function returns 0 if successful; if temporary buffer space is not
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available, the function returns
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.Er ENOMEM .
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.\"
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.Sh SEE ALSO
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.Xr ieee80211 9 ,
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.Xr ifnet 9
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.Sh HISTORY
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The
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.Nm ieee80211
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series of functions first appeared in
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.Nx 1.5 ,
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and were later ported to
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.Fx 4.6 .
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.Sh AUTHORS
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.An -nosplit
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This manual page was written by
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.An Bruce M. Simpson Aq bms@FreeBSD.org
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and
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.An Darron Broad Aq darron@kewl.org .
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