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1 .\"
2 .\" Copyright (c) 2004 Bruce M. Simpson <bms@spc.org>
3 .\" Copyright (c) 2004 Darron Broad <darron@kewl.org>
4 .\" All rights reserved.
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27 .\" $FreeBSD$
28 .\" $DragonFly: src/share/man/man9/ieee80211_output.9,v 1.7 2007/04/09 21:20:37 swildner Exp $
29 .\" $Id: ieee80211_output.9,v 1.2 2004/07/07 12:59:39 ru Exp $
30 .\"
31 .Dd June 28, 2006
32 .Dt IEEE80211_OUTPUT 9
33 .Os
34 .Sh NAME
35 .Nm ieee80211_encap ,
36 .Nm ieee80211_send_mgmt ,
37 .Nm ieee80211_add_ssid ,
38 .Nm ieee80211_add_rates ,
39 .Nm ieee80211_add_xrates
40 .Nd software 802.11 stack output functions
41 .Sh SYNOPSIS
42 .In netproto/802_11/ieee80211_var.h
43 .In netproto/802_11/ieee80211_proto.h
44 .Ft struct mbuf *
45 .Fo ieee80211_encap
46 .Fa "struct ieee80211com *ic" "struct mbuf *m" "struct ieee80211_node *ni"
47 .Fc
48 .Ft int
49 .Fo ieee80211_send_mgmt
50 .Fa "struct ieee80211com *ic" "struct ieee80211_node *ni" "int type" "int arg"
51 .Fc
52 .Ft uint8_t *
53 .Fn ieee80211_add_ssid "uint8_t *frm" "const uint8_t *ssid" "int ssid_len"
54 .Ft uint8_t *
55 .Fn ieee80211_add_rates "uint8_t *frm" "const struct ieee80211_rateset *rs"
56 .Ft uint8_t *
57 .Fn ieee80211_add_xrates "uint8_t *frm" "const struct ieee80211_rateset *rs"
58 .Sh DESCRIPTION
59 These functions handle the encapsulation and transmission of 802.11 frames
60 within the software 802.11 stack.
61 .Pp
62 The
63 .Fn ieee80211_encap
64 function encapsulates an outbound data frame contained within the
65 mbuf chain
66 .Fa m
67 from the interface
68 .Fa ic .
69 The argument
70 .Fa ni
71 is a reference to the destination node.
72 .Pp
73 .\"
74 The
75 .Fn ieee80211_send_mgmt
76 function transmits a management frame on the interface
77 .Fa ic
78 to the destination node
79 .Fa ni
80 of type
81 .Fa type .
82 The node entry
83 .Fa ni
84 must not be
85 .Dv NULL
86 and is typically the non-NULL return value of
87 .Xr ieee80211_find_txnode 9 .
88 This function is typically called through
89 .Fn IEEE80211_SEND_MGMT ,
90 which is a wrapper for the invocation of
91 .Va ic_send_mgmt .
92 .Pp
93 The argument
94 .Fa arg
95 specifies either a sequence number for authentication operations,
96 a status code for (re)association operations,
97 or a reason for deauthentication and deassociation operations.
98 .Pp
99 The destination node
100 .Fa ni
101 will have its reference count incremented to reflect its use for an
102 indeterminate amount of time.
103 This reference is freed either in
104 .Va if_start
105 or,
106 during the interrupt service routine for transmission completing
107 if certain transmission rate control algorithms are used.
108 .Pp
109 .\"
110 The
111 .Fn ieee80211_add_ssid
112 utility function is used to add the service set ID element
113 .Fa ssid
114 to the frame
115 .Fa frm .
116 The
117 .Fa ssid_len
118 argument indicates the length of the
119 .Fa ssid
120 to be added.
121 .Pp
122 .\"
123 The
124 .Fn ieee80211_add_rates
125 utility function is used to add the rate set element
126 .Fa rs
127 to the frame
128 .Fa frm .
129 .Pp
130 .\"
131 The
132 .Fn ieee80211_add_xrates
133 utility function is used to add the extended rate set element
134 .Fa rs
135 to the frame
136 .Fa frm .
137 .Pp
138 .\"
139 The functions
140 .Fn ieee80211_add_ssid ,
141 .Fn ieee80211_add_rates
142 and
143 .Fn ieee80211_add_xrates
144 are typically used when constructing management frames from within the
145 software 802.11 stack in 802.11g mode.
146 .\"
147 .Sh RETURN VALUES
148 If the function
149 .Fn ieee80211_encap
150 is successful,
151 the mbuf chain
152 .Fa m
153 is updated with the 802.11 frame header prepended,
154 and a pointer to the head of the updated mbuf chain is returned.
155 If an error occurs,
156 .Dv NULL
157 will be returned,
158 and
159 .Fa m
160 will be freed.
161 .Pp
162 .\"
163 The function
164 .Fn ieee80211_send_mgmt
165 returns 0 if successful;
166 if temporary buffer space is not available,
167 it returns
168 .Er ENOMEM .
169 .Pp
170 .\"
171 The functions
172 .Fn ieee80211_add_ssid ,
173 .Fn ieee80211_add_rates
174 and
175 .Fn ieee80211_add_xrates
176 return a pointer to the location in the
177 .Fa frm
178 after the addition of the second argument.
179 .\"
180 .Sh SEE ALSO
181 .Xr ieee80211 9 ,
182 .Xr ifnet 9
183 .Sh HISTORY
184 The
185 .Nm ieee80211
186 series of functions first appeared in
187 .Nx 1.5 ,
188 and were later ported to
189 .Fx 4.6 .
190 .Sh AUTHORS
191 .An -nosplit
192 This man page was written by
193 .An Bruce M. Simpson Aq bms@FreeBSD.org
194 and
195 .An Darron Broad Aq darron@kewl.org .