1 /* $NetBSD: ieee80211_node.h,v 1.32 2023/08/01 07:04:16 mrg Exp $ */
2 /*-
3 * Copyright (c) 2001 Atsushi Onoe
4 * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * Alternatively, this software may be distributed under the terms of the
19 * GNU General Public License ("GPL") version 2 as published by the Free
20 * Software Foundation.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 *
33 * $FreeBSD: src/sys/net80211/ieee80211_node.h,v 1.22 2005/08/10 16:22:29 sam Exp $
34 */
35 #ifndef _NET80211_IEEE80211_NODE_H_
36 #define _NET80211_IEEE80211_NODE_H_
37
38 #include <sys/atomic.h>
39 #include <net80211/ieee80211_netbsd.h>
40 #include <net80211/ieee80211_ioctl.h> /* for ieee80211_nodestats */
41
42 #ifdef _KERNEL
43 /*
44 * Each ieee80211com instance has a single timer that fires once a
45 * second. This is used to initiate various work depending on the
46 * state of the instance: scanning (passive or active), ``transition''
47 * (waiting for a response to a management frame when operating
48 * as a station), and node inactivity processing (when operating
49 * as an AP). For inactivity processing each node has a timeout
50 * set in its ni_inact field that is decremented on each timeout
51 * and the node is reclaimed when the counter goes to zero. We
52 * use different inactivity timeout values depending on whether
53 * the node is associated and authorized (either by 802.1x or
54 * open/shared key authentication) or associated but yet to be
55 * authorized. The latter timeout is shorter to more aggressively
56 * reclaim nodes that leave part way through the 802.1x exchange.
57 */
58 #define IEEE80211_INACT_WAIT 15 /* inactivity interval (secs) */
59 #define IEEE80211_INACT_INIT (30/IEEE80211_INACT_WAIT) /* initial */
60 #define IEEE80211_INACT_AUTH (180/IEEE80211_INACT_WAIT) /* associated but not authorized */
61 #define IEEE80211_INACT_RUN (300/IEEE80211_INACT_WAIT) /* authorized */
62 #define IEEE80211_INACT_PROBE (30/IEEE80211_INACT_WAIT) /* probe */
63 #define IEEE80211_INACT_SCAN (300/IEEE80211_INACT_WAIT) /* scanned */
64
65 #define IEEE80211_TRANS_WAIT 5 /* mgt frame tx timer (secs) */
66
67 #define IEEE80211_NODE_HASHSIZE 32
68 /* simple hash is enough for variation of macaddr */
69 #define IEEE80211_NODE_HASH(addr) \
70 (((const u_int8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % \
71 IEEE80211_NODE_HASHSIZE)
72
73 struct ieee80211_rsnparms {
74 u_int8_t rsn_mcastcipher; /* mcast/group cipher */
75 u_int8_t rsn_mcastkeylen; /* mcast key length */
76 u_int8_t rsn_ucastcipherset; /* unicast cipher set */
77 u_int8_t rsn_ucastcipher; /* selected unicast cipher */
78 u_int8_t rsn_ucastkeylen; /* unicast key length */
79 u_int8_t rsn_keymgmtset; /* key management algorithms */
80 u_int8_t rsn_keymgmt; /* selected key mgmt algo */
81 u_int16_t rsn_caps; /* capabilities */
82 };
83
84 struct ieee80211_node_table;
85 struct ieee80211com;
86
87 /*
88 * Node specific information. Note that drivers are expected
89 * to derive from this structure to add device-specific per-node
90 * state. This is done by overriding the ic_node_* methods in
91 * the ieee80211com structure.
92 */
93 struct ieee80211_node {
94 struct ieee80211com *ni_ic;
95 struct ieee80211_node_table *ni_table;
96 TAILQ_ENTRY(ieee80211_node) ni_list;
97 LIST_ENTRY(ieee80211_node) ni_hash;
98 u_int ni_refcnt;
99 u_int ni_scangen; /* gen# for timeout scan */
100 u_int8_t ni_authmode; /* authentication algorithm */
101 u_int16_t ni_flags; /* special-purpose state */
102 #define IEEE80211_NODE_AUTH 0x0001 /* authorized for data */
103 #define IEEE80211_NODE_QOS 0x0002 /* QoS enabled */
104 #define IEEE80211_NODE_ERP 0x0004 /* ERP enabled */
105 /* NB: this must have the same value as IEEE80211_FC1_PWR_MGT */
106 #define IEEE80211_NODE_PWR_MGT 0x0010 /* power save mode enabled */
107 #define IEEE80211_NODE_AREF 0x0020 /* authentication ref held */
108 u_int16_t ni_associd; /* assoc response */
109 u_int16_t ni_txpower; /* current transmit power */
110 u_int16_t ni_vlan; /* vlan tag */
111 u_int32_t *ni_challenge; /* shared-key challenge */
112 u_int8_t *ni_wpa_ie; /* captured WPA/RSN ie */
113 u_int8_t *ni_wme_ie; /* captured WME ie */
114 u_int16_t ni_txseqs[17]; /* tx seq per-tid */
115 u_int16_t ni_rxseqs[17]; /* rx seq previous per-tid*/
116 u_int32_t ni_rxfragstamp; /* time stamp of last rx frag */
117 struct mbuf *ni_rxfrag[3]; /* rx frag reassembly */
118 struct ieee80211_rsnparms ni_rsn; /* RSN/WPA parameters */
119 struct ieee80211_key ni_ucastkey; /* unicast key */
120
121 /* hardware */
122 u_int32_t ni_rstamp; /* recv timestamp */
123 u_int8_t ni_rssi; /* recv ssi */
124
125 /* header */
126 u_int8_t ni_macaddr[IEEE80211_ADDR_LEN];
127 u_int8_t ni_bssid[IEEE80211_ADDR_LEN];
128
129 /* beacon, probe response */
130 union {
131 u_int8_t data[8];
132 u_int64_t tsf;
133 } ni_tstamp; /* from last rcv'd beacon */
134 u_int16_t ni_intval; /* beacon interval */
135 u_int16_t ni_capinfo; /* capabilities */
136 u_int8_t ni_esslen;
137 u_int8_t ni_essid[IEEE80211_NWID_LEN];
138 struct ieee80211_rateset ni_rates; /* negotiated rate set */
139 struct ieee80211_channel *ni_chan; /* XXX multiple uses */
140 u_int16_t ni_fhdwell; /* FH only */
141 u_int8_t ni_fhindex; /* FH only */
142 u_int8_t ni_erp; /* ERP from beacon/probe resp */
143 u_int16_t ni_timoff; /* byte offset to TIM ie */
144 u_int8_t ni_dtim_period; /* DTIM period */
145 u_int8_t ni_dtim_count; /* DTIM count for last bcn */
146
147 /* others */
148 int ni_fails; /* failure count to associate */
149 short ni_inact; /* inactivity mark count */
150 short ni_inact_reload;/* inactivity reload value */
151 int ni_txrate; /* index to ni_rates[] */
152 struct ifqueue ni_savedq; /* ps-poll queue */
153 struct ieee80211_nodestats ni_stats; /* per-node statistics */
154 };
155 MALLOC_DECLARE(M_80211_NODE);
156
157 #define IEEE80211_NODE_AID(ni) IEEE80211_AID(ni->ni_associd)
158
159 #define IEEE80211_NODE_STAT(ni,stat) (ni->ni_stats.ns_##stat++)
160 #define IEEE80211_NODE_STAT_ADD(ni,stat,v) (ni->ni_stats.ns_##stat += v)
161 #define IEEE80211_NODE_STAT_SET(ni,stat,v) (ni->ni_stats.ns_##stat = v)
162
163 struct ieee80211com;
164
165 void ieee80211_node_attach(struct ieee80211com *);
166 void ieee80211_node_lateattach(struct ieee80211com *);
167 void ieee80211_node_detach(struct ieee80211com *);
168
169 static __inline int
ieee80211_node_is_authorized(const struct ieee80211_node * ni)170 ieee80211_node_is_authorized(const struct ieee80211_node *ni)
171 {
172 return (ni->ni_flags & IEEE80211_NODE_AUTH);
173 }
174
175 void ieee80211_node_authorize(struct ieee80211_node *);
176 void ieee80211_node_unauthorize(struct ieee80211_node *);
177
178 void ieee80211_begin_scan(struct ieee80211com *, int);
179 int ieee80211_next_scan(struct ieee80211com *);
180 void ieee80211_probe_curchan(struct ieee80211com *, int);
181 void ieee80211_create_ibss(struct ieee80211com*, struct ieee80211_channel *);
182 void ieee80211_reset_bss(struct ieee80211com *);
183 void ieee80211_cancel_scan(struct ieee80211com *);
184 void ieee80211_end_scan(struct ieee80211com *);
185 int ieee80211_ibss_merge(struct ieee80211_node *);
186 int ieee80211_sta_join(struct ieee80211com *, struct ieee80211_node *);
187 void ieee80211_sta_leave(struct ieee80211com *, struct ieee80211_node *);
188
189 /*
190 * Table of ieee80211_node instances. Each ieee80211com
191 * has at least one for holding the scan candidates.
192 * When operating as an access point or in ibss mode there
193 * is a second table for associated stations or neighbors.
194 */
195 struct ieee80211_node_table {
196 struct ieee80211com *nt_ic; /* back reference */
197 ieee80211_node_lock_t nt_nodelock; /* on node table */
198 TAILQ_HEAD(, ieee80211_node) nt_node; /* information of all nodes */
199 LIST_HEAD(, ieee80211_node) nt_hash[IEEE80211_NODE_HASHSIZE];
200 const char *nt_name; /* for debugging */
201 ieee80211_scan_lock_t nt_scanlock; /* on nt_scangen */
202 u_int nt_scangen; /* gen# for timeout scan */
203 int nt_inact_timer; /* inactivity timer */
204 int nt_inact_init; /* initial node inact setting */
205 struct ieee80211_node **nt_keyixmap; /* key ix -> node map */
206 int nt_keyixmax; /* keyixmap size */
207
208 void (*nt_timeout)(struct ieee80211_node_table *);
209 };
210 void ieee80211_node_table_reset(struct ieee80211_node_table *);
211
212 struct ieee80211_node *ieee80211_alloc_node(
213 struct ieee80211_node_table *, const u_int8_t *);
214 struct ieee80211_node *ieee80211_tmp_node(struct ieee80211com *,
215 const u_int8_t *macaddr);
216 struct ieee80211_node *ieee80211_dup_bss(struct ieee80211_node_table *,
217 const u_int8_t *);
218 #ifdef IEEE80211_DEBUG_REFCNT
219 void ieee80211_free_node_debug(struct ieee80211_node *,
220 const char *func, int line);
221 struct ieee80211_node *ieee80211_find_node_debug(
222 struct ieee80211_node_table *, const u_int8_t *,
223 const char *func, int line);
224 struct ieee80211_node * ieee80211_find_rxnode_debug(
225 struct ieee80211com *, const struct ieee80211_frame_min *,
226 const char *func, int line);
227 struct ieee80211_node * ieee80211_find_rxnode_withkey_debug(
228 struct ieee80211com *,
229 const struct ieee80211_frame_min *, u_int16_t keyix,
230 const char *func, int line);
231 struct ieee80211_node *ieee80211_find_txnode_debug(
232 struct ieee80211com *, const u_int8_t *,
233 const char *func, int line);
234 struct ieee80211_node *ieee80211_find_node_with_channel_debug(
235 struct ieee80211_node_table *, const u_int8_t *macaddr,
236 struct ieee80211_channel *, const char *func, int line);
237 struct ieee80211_node *ieee80211_find_node_with_ssid_debug(
238 struct ieee80211_node_table *, const u_int8_t *macaddr,
239 u_int ssidlen, const u_int8_t *ssid,
240 const char *func, int line);
241 #define ieee80211_free_node(ni) \
242 ieee80211_free_node_debug(ni, __func__, __LINE__)
243 #define ieee80211_find_node(nt, mac) \
244 ieee80211_find_node_debug(nt, mac, __func__, __LINE__)
245 #define ieee80211_find_rxnode(nt, wh) \
246 ieee80211_find_rxnode_debug(nt, wh, __func__, __LINE__)
247 #define ieee80211_find_rxnode_withkey(nt, wh, keyix) \
248 ieee80211_find_rxnode_withkey_debug(nt, wh, keyix, __func__, __LINE__)
249 #define ieee80211_find_txnode(nt, mac) \
250 ieee80211_find_txnode_debug(nt, mac, __func__, __LINE__)
251 #define ieee80211_find_node_with_channel(nt, mac, c) \
252 ieee80211_find_node_with_channel_debug(nt, mac, c, __func__, __LINE__)
253 #define ieee80211_find_node_with_ssid(nt, mac, sl, ss) \
254 ieee80211_find_node_with_ssid_debug(nt, mac, sl, ss, __func__, __LINE__)
255 #else
256 void ieee80211_free_node(struct ieee80211_node *);
257 struct ieee80211_node *ieee80211_find_node(
258 struct ieee80211_node_table *, const u_int8_t *);
259 struct ieee80211_node * ieee80211_find_rxnode(
260 struct ieee80211com *, const struct ieee80211_frame_min *);
261 struct ieee80211_node * ieee80211_find_rxnode_withkey(struct ieee80211com *,
262 const struct ieee80211_frame_min *, u_int16_t keyix);
263 struct ieee80211_node *ieee80211_find_txnode(
264 struct ieee80211com *, const u_int8_t *);
265 struct ieee80211_node *ieee80211_find_node_with_channel(
266 struct ieee80211_node_table *, const u_int8_t *macaddr,
267 struct ieee80211_channel *);
268 struct ieee80211_node *ieee80211_find_node_with_ssid(
269 struct ieee80211_node_table *, const u_int8_t *macaddr,
270 u_int ssidlen, const u_int8_t *ssid);
271 #endif
272 int ieee80211_node_delucastkey(struct ieee80211_node *);
273
274 struct ieee80211_node *ieee80211_refine_node_for_beacon(
275 struct ieee80211com *, struct ieee80211_node *,
276 struct ieee80211_channel *, const u_int8_t *ssid);
277 typedef void ieee80211_iter_func(void *, struct ieee80211_node *);
278 void ieee80211_iterate_nodes(struct ieee80211_node_table *,
279 ieee80211_iter_func *, void *);
280
281 void ieee80211_dump_node(struct ieee80211_node_table *,
282 struct ieee80211_node *);
283 void ieee80211_dump_nodes(struct ieee80211_node_table *);
284
285 struct ieee80211_node *ieee80211_fakeup_adhoc_node(
286 struct ieee80211_node_table *,
287 const u_int8_t macaddr[IEEE80211_ADDR_LEN]);
288 void ieee80211_node_join(struct ieee80211com *, struct ieee80211_node *,int);
289 void ieee80211_node_leave(struct ieee80211com *, struct ieee80211_node *);
290 u_int8_t ieee80211_getrssi(struct ieee80211com *ic);
291
292 /*
293 * Parameters supplied when adding/updating an entry in a
294 * scan cache. Pointer variables should be set to NULL
295 * if no data is available. Pointer references can be to
296 * local data; any information that is saved will be copied.
297 * All multi-byte values must be in host byte order.
298 */
299 struct ieee80211_scanparams {
300 u_int16_t sp_capinfo; /* 802.11 capabilities */
301 u_int16_t sp_fhdwell; /* FHSS dwell interval */
302 u_int8_t sp_chan; /* */
303 u_int8_t sp_bchan;
304 u_int8_t sp_fhindex;
305 u_int8_t sp_erp;
306 u_int16_t sp_bintval;
307 u_int16_t sp_timoff;
308 u_int8_t *sp_tim;
309 u_int8_t *sp_tstamp;
310 u_int8_t *sp_country;
311 u_int8_t *sp_ssid;
312 u_int8_t *sp_rates;
313 u_int8_t *sp_xrates;
314 u_int8_t *sp_wpa;
315 u_int8_t *sp_wme;
316 };
317
318 /*
319 * Node reference counting definitions.
320 *
321 * ieee80211_node_initref initialize the reference count to 1
322 * ieee80211_node_incref add a reference
323 * ieee80211_node_decref remove a reference
324 * ieee80211_node_dectestref remove a reference and return 1 if this
325 * is the last reference, otherwise 0
326 * ieee80211_node_refcnt reference count for printing (only)
327 */
328
329 static __inline void
ieee80211_node_initref(struct ieee80211_node * ni)330 ieee80211_node_initref(struct ieee80211_node *ni)
331 {
332 ni->ni_refcnt = 1;
333 }
334
335 static __inline void
ieee80211_node_incref(struct ieee80211_node * ni)336 ieee80211_node_incref(struct ieee80211_node *ni)
337 {
338 atomic_inc_uint(&ni->ni_refcnt);
339 }
340
341 static __inline void
ieee80211_node_decref(struct ieee80211_node * ni)342 ieee80211_node_decref(struct ieee80211_node *ni)
343 {
344 atomic_dec_uint(&ni->ni_refcnt);
345 }
346
347 int ieee80211_node_dectestref(struct ieee80211_node *ni);
348
349 static __inline unsigned int
ieee80211_node_refcnt(const struct ieee80211_node * ni)350 ieee80211_node_refcnt(const struct ieee80211_node *ni)
351 {
352 return ni->ni_refcnt;
353 }
354
355 static __inline struct ieee80211_node *
ieee80211_ref_node(struct ieee80211_node * ni)356 ieee80211_ref_node(struct ieee80211_node *ni)
357 {
358 ieee80211_node_incref(ni);
359 return ni;
360 }
361
362 static __inline void
ieee80211_unref_node(struct ieee80211_node ** ni)363 ieee80211_unref_node(struct ieee80211_node **ni)
364 {
365 ieee80211_node_decref(*ni);
366 *ni = NULL; /* guard against use */
367 }
368
369 void ieee80211_add_scan(struct ieee80211com *,
370 const struct ieee80211_scanparams *,
371 const struct ieee80211_frame *,
372 int subtype, int rssi, int rstamp);
373 void ieee80211_init_neighbor(struct ieee80211com *, struct ieee80211_node *,
374 const struct ieee80211_frame *,
375 const struct ieee80211_scanparams *, int);
376 struct ieee80211_node *ieee80211_add_neighbor(struct ieee80211com *,
377 const struct ieee80211_frame *,
378 const struct ieee80211_scanparams *);
379 #endif /* _KERNEL */
380 #endif /* !_NET80211_IEEE80211_NODE_H_ */
381