ieee80211.c revision 219456
1297667Ssgalabov/*-
2297667Ssgalabov * Copyright (c) 2001 Atsushi Onoe
3297667Ssgalabov * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
4297667Ssgalabov * All rights reserved.
5297667Ssgalabov *
6297667Ssgalabov * Redistribution and use in source and binary forms, with or without
7297667Ssgalabov * modification, are permitted provided that the following conditions
8297667Ssgalabov * are met:
9297667Ssgalabov * 1. Redistributions of source code must retain the above copyright
10297667Ssgalabov *    notice, this list of conditions and the following disclaimer.
11297667Ssgalabov * 2. Redistributions in binary form must reproduce the above copyright
12297667Ssgalabov *    notice, this list of conditions and the following disclaimer in the
13297667Ssgalabov *    documentation and/or other materials provided with the distribution.
14297667Ssgalabov *
15297667Ssgalabov * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16297667Ssgalabov * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17297667Ssgalabov * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18297667Ssgalabov * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19297667Ssgalabov * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20297667Ssgalabov * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21297667Ssgalabov * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22297667Ssgalabov * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23297667Ssgalabov * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24297667Ssgalabov * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25297667Ssgalabov */
26297667Ssgalabov
27297667Ssgalabov#include <sys/cdefs.h>
28297667Ssgalabov__FBSDID("$FreeBSD: head/sys/net80211/ieee80211.c 219456 2011-03-10 18:17:24Z bschmidt $");
29297667Ssgalabov
30297667Ssgalabov/*
31297667Ssgalabov * IEEE 802.11 generic handler
32297667Ssgalabov */
33297667Ssgalabov#include "opt_wlan.h"
34297667Ssgalabov
35297667Ssgalabov#include <sys/param.h>
36297667Ssgalabov#include <sys/systm.h>
37297667Ssgalabov#include <sys/kernel.h>
38297667Ssgalabov
39297667Ssgalabov#include <sys/socket.h>
40297667Ssgalabov
41297667Ssgalabov#include <net/if.h>
42297667Ssgalabov#include <net/if_dl.h>
43297667Ssgalabov#include <net/if_media.h>
44297667Ssgalabov#include <net/if_types.h>
45297667Ssgalabov#include <net/ethernet.h>
46297667Ssgalabov
47297667Ssgalabov#include <net80211/ieee80211_var.h>
48297667Ssgalabov#include <net80211/ieee80211_regdomain.h>
49297667Ssgalabov#ifdef IEEE80211_SUPPORT_SUPERG
50297667Ssgalabov#include <net80211/ieee80211_superg.h>
51297667Ssgalabov#endif
52297667Ssgalabov#include <net80211/ieee80211_ratectl.h>
53297667Ssgalabov
54297667Ssgalabov#include <net/bpf.h>
55297667Ssgalabov
56297667Ssgalabovconst char *ieee80211_phymode_name[IEEE80211_MODE_MAX] = {
57297667Ssgalabov	[IEEE80211_MODE_AUTO]	  = "auto",
58297667Ssgalabov	[IEEE80211_MODE_11A]	  = "11a",
59297667Ssgalabov	[IEEE80211_MODE_11B]	  = "11b",
60297667Ssgalabov	[IEEE80211_MODE_11G]	  = "11g",
61297667Ssgalabov	[IEEE80211_MODE_FH]	  = "FH",
62297667Ssgalabov	[IEEE80211_MODE_TURBO_A]  = "turboA",
63297667Ssgalabov	[IEEE80211_MODE_TURBO_G]  = "turboG",
64297667Ssgalabov	[IEEE80211_MODE_STURBO_A] = "sturboA",
65297667Ssgalabov	[IEEE80211_MODE_HALF]	  = "half",
66297667Ssgalabov	[IEEE80211_MODE_QUARTER]  = "quarter",
67297667Ssgalabov	[IEEE80211_MODE_11NA]	  = "11na",
68297667Ssgalabov	[IEEE80211_MODE_11NG]	  = "11ng",
69297667Ssgalabov};
70297667Ssgalabov/* map ieee80211_opmode to the corresponding capability bit */
71297667Ssgalabovconst int ieee80211_opcap[IEEE80211_OPMODE_MAX] = {
72297667Ssgalabov	[IEEE80211_M_IBSS]	= IEEE80211_C_IBSS,
73297667Ssgalabov	[IEEE80211_M_WDS]	= IEEE80211_C_WDS,
74297667Ssgalabov	[IEEE80211_M_STA]	= IEEE80211_C_STA,
75297667Ssgalabov	[IEEE80211_M_AHDEMO]	= IEEE80211_C_AHDEMO,
76297667Ssgalabov	[IEEE80211_M_HOSTAP]	= IEEE80211_C_HOSTAP,
77297667Ssgalabov	[IEEE80211_M_MONITOR]	= IEEE80211_C_MONITOR,
78297667Ssgalabov#ifdef IEEE80211_SUPPORT_MESH
79297667Ssgalabov	[IEEE80211_M_MBSS]	= IEEE80211_C_MBSS,
80297667Ssgalabov#endif
81297667Ssgalabov};
82297667Ssgalabov
83297667Ssgalabovstatic const uint8_t ieee80211broadcastaddr[IEEE80211_ADDR_LEN] =
84297667Ssgalabov	{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
85297667Ssgalabov
86297667Ssgalabovstatic	void ieee80211_syncflag_locked(struct ieee80211com *ic, int flag);
87297667Ssgalabovstatic	void ieee80211_syncflag_ht_locked(struct ieee80211com *ic, int flag);
88297667Ssgalabovstatic	void ieee80211_syncflag_ext_locked(struct ieee80211com *ic, int flag);
89297667Ssgalabovstatic	int ieee80211_media_setup(struct ieee80211com *ic,
90297667Ssgalabov		struct ifmedia *media, int caps, int addsta,
91297667Ssgalabov		ifm_change_cb_t media_change, ifm_stat_cb_t media_stat);
92297667Ssgalabovstatic	void ieee80211com_media_status(struct ifnet *, struct ifmediareq *);
93297667Ssgalabovstatic	int ieee80211com_media_change(struct ifnet *);
94297667Ssgalabovstatic	int media_status(enum ieee80211_opmode,
95297667Ssgalabov		const struct ieee80211_channel *);
96297667Ssgalabov
97297667SsgalabovMALLOC_DEFINE(M_80211_VAP, "80211vap", "802.11 vap state");
98297667Ssgalabov
99297667Ssgalabov/*
100297667Ssgalabov * Default supported rates for 802.11 operation (in IEEE .5Mb units).
101297667Ssgalabov */
102297667Ssgalabov#define	B(r)	((r) | IEEE80211_RATE_BASIC)
103297667Ssgalabovstatic const struct ieee80211_rateset ieee80211_rateset_11a =
104297667Ssgalabov	{ 8, { B(12), 18, B(24), 36, B(48), 72, 96, 108 } };
105297667Ssgalabovstatic const struct ieee80211_rateset ieee80211_rateset_half =
106297667Ssgalabov	{ 8, { B(6), 9, B(12), 18, B(24), 36, 48, 54 } };
107297667Ssgalabovstatic const struct ieee80211_rateset ieee80211_rateset_quarter =
108297667Ssgalabov	{ 8, { B(3), 4, B(6), 9, B(12), 18, 24, 27 } };
109297667Ssgalabovstatic const struct ieee80211_rateset ieee80211_rateset_11b =
110297667Ssgalabov	{ 4, { B(2), B(4), B(11), B(22) } };
111297667Ssgalabov/* NB: OFDM rates are handled specially based on mode */
112297667Ssgalabovstatic const struct ieee80211_rateset ieee80211_rateset_11g =
113297667Ssgalabov	{ 12, { B(2), B(4), B(11), B(22), 12, 18, 24, 36, 48, 72, 96, 108 } };
114297667Ssgalabov#undef B
115297667Ssgalabov
116297667Ssgalabov/*
117297667Ssgalabov * Fill in 802.11 available channel set, mark
118297667Ssgalabov * all available channels as active, and pick
119297667Ssgalabov * a default channel if not already specified.
120297667Ssgalabov */
121297667Ssgalabovstatic void
122297667Ssgalabovieee80211_chan_init(struct ieee80211com *ic)
123297667Ssgalabov{
124297667Ssgalabov#define	DEFAULTRATES(m, def) do { \
125297667Ssgalabov	if (ic->ic_sup_rates[m].rs_nrates == 0) \
126297667Ssgalabov		ic->ic_sup_rates[m] = def; \
127297667Ssgalabov} while (0)
128297667Ssgalabov	struct ieee80211_channel *c;
129297667Ssgalabov	int i;
130297667Ssgalabov
131297667Ssgalabov	KASSERT(0 < ic->ic_nchans && ic->ic_nchans <= IEEE80211_CHAN_MAX,
132297667Ssgalabov		("invalid number of channels specified: %u", ic->ic_nchans));
133297667Ssgalabov	memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail));
134297667Ssgalabov	memset(ic->ic_modecaps, 0, sizeof(ic->ic_modecaps));
135297667Ssgalabov	setbit(ic->ic_modecaps, IEEE80211_MODE_AUTO);
136297667Ssgalabov	for (i = 0; i < ic->ic_nchans; i++) {
137297667Ssgalabov		c = &ic->ic_channels[i];
138297667Ssgalabov		KASSERT(c->ic_flags != 0, ("channel with no flags"));
139297667Ssgalabov		/*
140297667Ssgalabov		 * Help drivers that work only with frequencies by filling
141297667Ssgalabov		 * in IEEE channel #'s if not already calculated.  Note this
142297667Ssgalabov		 * mimics similar work done in ieee80211_setregdomain when
143297667Ssgalabov		 * changing regulatory state.
144297667Ssgalabov		 */
145297667Ssgalabov		if (c->ic_ieee == 0)
146297667Ssgalabov			c->ic_ieee = ieee80211_mhz2ieee(c->ic_freq,c->ic_flags);
147297667Ssgalabov		if (IEEE80211_IS_CHAN_HT40(c) && c->ic_extieee == 0)
148297667Ssgalabov			c->ic_extieee = ieee80211_mhz2ieee(c->ic_freq +
149297667Ssgalabov			    (IEEE80211_IS_CHAN_HT40U(c) ? 20 : -20),
150297667Ssgalabov			    c->ic_flags);
151297667Ssgalabov		/* default max tx power to max regulatory */
152297667Ssgalabov		if (c->ic_maxpower == 0)
153297667Ssgalabov			c->ic_maxpower = 2*c->ic_maxregpower;
154297667Ssgalabov		setbit(ic->ic_chan_avail, c->ic_ieee);
155297667Ssgalabov		/*
156297667Ssgalabov		 * Identify mode capabilities.
157		 */
158		if (IEEE80211_IS_CHAN_A(c))
159			setbit(ic->ic_modecaps, IEEE80211_MODE_11A);
160		if (IEEE80211_IS_CHAN_B(c))
161			setbit(ic->ic_modecaps, IEEE80211_MODE_11B);
162		if (IEEE80211_IS_CHAN_ANYG(c))
163			setbit(ic->ic_modecaps, IEEE80211_MODE_11G);
164		if (IEEE80211_IS_CHAN_FHSS(c))
165			setbit(ic->ic_modecaps, IEEE80211_MODE_FH);
166		if (IEEE80211_IS_CHAN_108A(c))
167			setbit(ic->ic_modecaps, IEEE80211_MODE_TURBO_A);
168		if (IEEE80211_IS_CHAN_108G(c))
169			setbit(ic->ic_modecaps, IEEE80211_MODE_TURBO_G);
170		if (IEEE80211_IS_CHAN_ST(c))
171			setbit(ic->ic_modecaps, IEEE80211_MODE_STURBO_A);
172		if (IEEE80211_IS_CHAN_HALF(c))
173			setbit(ic->ic_modecaps, IEEE80211_MODE_HALF);
174		if (IEEE80211_IS_CHAN_QUARTER(c))
175			setbit(ic->ic_modecaps, IEEE80211_MODE_QUARTER);
176		if (IEEE80211_IS_CHAN_HTA(c))
177			setbit(ic->ic_modecaps, IEEE80211_MODE_11NA);
178		if (IEEE80211_IS_CHAN_HTG(c))
179			setbit(ic->ic_modecaps, IEEE80211_MODE_11NG);
180	}
181	/* initialize candidate channels to all available */
182	memcpy(ic->ic_chan_active, ic->ic_chan_avail,
183		sizeof(ic->ic_chan_avail));
184
185	/* sort channel table to allow lookup optimizations */
186	ieee80211_sort_channels(ic->ic_channels, ic->ic_nchans);
187
188	/* invalidate any previous state */
189	ic->ic_bsschan = IEEE80211_CHAN_ANYC;
190	ic->ic_prevchan = NULL;
191	ic->ic_csa_newchan = NULL;
192	/* arbitrarily pick the first channel */
193	ic->ic_curchan = &ic->ic_channels[0];
194	ic->ic_rt = ieee80211_get_ratetable(ic->ic_curchan);
195
196	/* fillin well-known rate sets if driver has not specified */
197	DEFAULTRATES(IEEE80211_MODE_11B,	 ieee80211_rateset_11b);
198	DEFAULTRATES(IEEE80211_MODE_11G,	 ieee80211_rateset_11g);
199	DEFAULTRATES(IEEE80211_MODE_11A,	 ieee80211_rateset_11a);
200	DEFAULTRATES(IEEE80211_MODE_TURBO_A,	 ieee80211_rateset_11a);
201	DEFAULTRATES(IEEE80211_MODE_TURBO_G,	 ieee80211_rateset_11g);
202	DEFAULTRATES(IEEE80211_MODE_STURBO_A,	 ieee80211_rateset_11a);
203	DEFAULTRATES(IEEE80211_MODE_HALF,	 ieee80211_rateset_half);
204	DEFAULTRATES(IEEE80211_MODE_QUARTER,	 ieee80211_rateset_quarter);
205	DEFAULTRATES(IEEE80211_MODE_11NA,	 ieee80211_rateset_11a);
206	DEFAULTRATES(IEEE80211_MODE_11NG,	 ieee80211_rateset_11g);
207
208	/*
209	 * Set auto mode to reset active channel state and any desired channel.
210	 */
211	(void) ieee80211_setmode(ic, IEEE80211_MODE_AUTO);
212#undef DEFAULTRATES
213}
214
215static void
216null_update_mcast(struct ifnet *ifp)
217{
218	if_printf(ifp, "need multicast update callback\n");
219}
220
221static void
222null_update_promisc(struct ifnet *ifp)
223{
224	if_printf(ifp, "need promiscuous mode update callback\n");
225}
226
227static int
228null_transmit(struct ifnet *ifp, struct mbuf *m)
229{
230	m_freem(m);
231	ifp->if_oerrors++;
232	return EACCES;		/* XXX EIO/EPERM? */
233}
234
235static int
236null_output(struct ifnet *ifp, struct mbuf *m,
237	struct sockaddr *dst, struct route *ro)
238{
239	if_printf(ifp, "discard raw packet\n");
240	return null_transmit(ifp, m);
241}
242
243static void
244null_input(struct ifnet *ifp, struct mbuf *m)
245{
246	if_printf(ifp, "if_input should not be called\n");
247	m_freem(m);
248}
249
250/*
251 * Attach/setup the common net80211 state.  Called by
252 * the driver on attach to prior to creating any vap's.
253 */
254void
255ieee80211_ifattach(struct ieee80211com *ic,
256	const uint8_t macaddr[IEEE80211_ADDR_LEN])
257{
258	struct ifnet *ifp = ic->ic_ifp;
259	struct sockaddr_dl *sdl;
260	struct ifaddr *ifa;
261
262	KASSERT(ifp->if_type == IFT_IEEE80211, ("if_type %d", ifp->if_type));
263
264	IEEE80211_LOCK_INIT(ic, ifp->if_xname);
265	TAILQ_INIT(&ic->ic_vaps);
266
267	/* Create a taskqueue for all state changes */
268	ic->ic_tq = taskqueue_create("ic_taskq", M_WAITOK | M_ZERO,
269	    taskqueue_thread_enqueue, &ic->ic_tq);
270	taskqueue_start_threads(&ic->ic_tq, 1, PI_NET, "%s taskq",
271	    ifp->if_xname);
272	/*
273	 * Fill in 802.11 available channel set, mark all
274	 * available channels as active, and pick a default
275	 * channel if not already specified.
276	 */
277	ieee80211_media_init(ic);
278
279	ic->ic_update_mcast = null_update_mcast;
280	ic->ic_update_promisc = null_update_promisc;
281
282	ic->ic_hash_key = arc4random();
283	ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT;
284	ic->ic_lintval = ic->ic_bintval;
285	ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX;
286
287	ieee80211_crypto_attach(ic);
288	ieee80211_node_attach(ic);
289	ieee80211_power_attach(ic);
290	ieee80211_proto_attach(ic);
291#ifdef IEEE80211_SUPPORT_SUPERG
292	ieee80211_superg_attach(ic);
293#endif
294	ieee80211_ht_attach(ic);
295	ieee80211_scan_attach(ic);
296	ieee80211_regdomain_attach(ic);
297	ieee80211_dfs_attach(ic);
298
299	ieee80211_sysctl_attach(ic);
300
301	ifp->if_addrlen = IEEE80211_ADDR_LEN;
302	ifp->if_hdrlen = 0;
303	if_attach(ifp);
304	ifp->if_mtu = IEEE80211_MTU_MAX;
305	ifp->if_broadcastaddr = ieee80211broadcastaddr;
306	ifp->if_output = null_output;
307	ifp->if_input = null_input;	/* just in case */
308	ifp->if_resolvemulti = NULL;	/* NB: callers check */
309
310	ifa = ifaddr_byindex(ifp->if_index);
311	KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
312	sdl = (struct sockaddr_dl *)ifa->ifa_addr;
313	sdl->sdl_type = IFT_ETHER;		/* XXX IFT_IEEE80211? */
314	sdl->sdl_alen = IEEE80211_ADDR_LEN;
315	IEEE80211_ADDR_COPY(LLADDR(sdl), macaddr);
316	ifa_free(ifa);
317}
318
319/*
320 * Detach net80211 state on device detach.  Tear down
321 * all vap's and reclaim all common state prior to the
322 * device state going away.  Note we may call back into
323 * driver; it must be prepared for this.
324 */
325void
326ieee80211_ifdetach(struct ieee80211com *ic)
327{
328	struct ifnet *ifp = ic->ic_ifp;
329	struct ieee80211vap *vap;
330
331	if_detach(ifp);
332
333	while ((vap = TAILQ_FIRST(&ic->ic_vaps)) != NULL)
334		ieee80211_vap_destroy(vap);
335	ieee80211_waitfor_parent(ic);
336
337	ieee80211_sysctl_detach(ic);
338	ieee80211_dfs_detach(ic);
339	ieee80211_regdomain_detach(ic);
340	ieee80211_scan_detach(ic);
341#ifdef IEEE80211_SUPPORT_SUPERG
342	ieee80211_superg_detach(ic);
343#endif
344	ieee80211_ht_detach(ic);
345	/* NB: must be called before ieee80211_node_detach */
346	ieee80211_proto_detach(ic);
347	ieee80211_crypto_detach(ic);
348	ieee80211_power_detach(ic);
349	ieee80211_node_detach(ic);
350
351	ifmedia_removeall(&ic->ic_media);
352	taskqueue_free(ic->ic_tq);
353	IEEE80211_LOCK_DESTROY(ic);
354}
355
356/*
357 * Default reset method for use with the ioctl support.  This
358 * method is invoked after any state change in the 802.11
359 * layer that should be propagated to the hardware but not
360 * require re-initialization of the 802.11 state machine (e.g
361 * rescanning for an ap).  We always return ENETRESET which
362 * should cause the driver to re-initialize the device. Drivers
363 * can override this method to implement more optimized support.
364 */
365static int
366default_reset(struct ieee80211vap *vap, u_long cmd)
367{
368	return ENETRESET;
369}
370
371/*
372 * Prepare a vap for use.  Drivers use this call to
373 * setup net80211 state in new vap's prior attaching
374 * them with ieee80211_vap_attach (below).
375 */
376int
377ieee80211_vap_setup(struct ieee80211com *ic, struct ieee80211vap *vap,
378	const char name[IFNAMSIZ], int unit, int opmode, int flags,
379	const uint8_t bssid[IEEE80211_ADDR_LEN],
380	const uint8_t macaddr[IEEE80211_ADDR_LEN])
381{
382	struct ifnet *ifp;
383
384	ifp = if_alloc(IFT_ETHER);
385	if (ifp == NULL) {
386		if_printf(ic->ic_ifp, "%s: unable to allocate ifnet\n",
387		    __func__);
388		return ENOMEM;
389	}
390	if_initname(ifp, name, unit);
391	ifp->if_softc = vap;			/* back pointer */
392	ifp->if_flags = IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST;
393	ifp->if_start = ieee80211_start;
394	ifp->if_ioctl = ieee80211_ioctl;
395	ifp->if_init = ieee80211_init;
396	/* NB: input+output filled in by ether_ifattach */
397	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
398	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
399	IFQ_SET_READY(&ifp->if_snd);
400
401	vap->iv_ifp = ifp;
402	vap->iv_ic = ic;
403	vap->iv_flags = ic->ic_flags;		/* propagate common flags */
404	vap->iv_flags_ext = ic->ic_flags_ext;
405	vap->iv_flags_ven = ic->ic_flags_ven;
406	vap->iv_caps = ic->ic_caps &~ IEEE80211_C_OPMODE;
407	vap->iv_htcaps = ic->ic_htcaps;
408	vap->iv_htextcaps = ic->ic_htextcaps;
409	vap->iv_opmode = opmode;
410	vap->iv_caps |= ieee80211_opcap[opmode];
411	switch (opmode) {
412	case IEEE80211_M_WDS:
413		/*
414		 * WDS links must specify the bssid of the far end.
415		 * For legacy operation this is a static relationship.
416		 * For non-legacy operation the station must associate
417		 * and be authorized to pass traffic.  Plumbing the
418		 * vap to the proper node happens when the vap
419		 * transitions to RUN state.
420		 */
421		IEEE80211_ADDR_COPY(vap->iv_des_bssid, bssid);
422		vap->iv_flags |= IEEE80211_F_DESBSSID;
423		if (flags & IEEE80211_CLONE_WDSLEGACY)
424			vap->iv_flags_ext |= IEEE80211_FEXT_WDSLEGACY;
425		break;
426#ifdef IEEE80211_SUPPORT_TDMA
427	case IEEE80211_M_AHDEMO:
428		if (flags & IEEE80211_CLONE_TDMA) {
429			/* NB: checked before clone operation allowed */
430			KASSERT(ic->ic_caps & IEEE80211_C_TDMA,
431			    ("not TDMA capable, ic_caps 0x%x", ic->ic_caps));
432			/*
433			 * Propagate TDMA capability to mark vap; this
434			 * cannot be removed and is used to distinguish
435			 * regular ahdemo operation from ahdemo+tdma.
436			 */
437			vap->iv_caps |= IEEE80211_C_TDMA;
438		}
439		break;
440#endif
441	}
442	/* auto-enable s/w beacon miss support */
443	if (flags & IEEE80211_CLONE_NOBEACONS)
444		vap->iv_flags_ext |= IEEE80211_FEXT_SWBMISS;
445	/* auto-generated or user supplied MAC address */
446	if (flags & (IEEE80211_CLONE_BSSID|IEEE80211_CLONE_MACADDR))
447		vap->iv_flags_ext |= IEEE80211_FEXT_UNIQMAC;
448	/*
449	 * Enable various functionality by default if we're
450	 * capable; the driver can override us if it knows better.
451	 */
452	if (vap->iv_caps & IEEE80211_C_WME)
453		vap->iv_flags |= IEEE80211_F_WME;
454	if (vap->iv_caps & IEEE80211_C_BURST)
455		vap->iv_flags |= IEEE80211_F_BURST;
456	/* NB: bg scanning only makes sense for station mode right now */
457	if (vap->iv_opmode == IEEE80211_M_STA &&
458	    (vap->iv_caps & IEEE80211_C_BGSCAN))
459		vap->iv_flags |= IEEE80211_F_BGSCAN;
460	vap->iv_flags |= IEEE80211_F_DOTH;	/* XXX no cap, just ena */
461	/* NB: DFS support only makes sense for ap mode right now */
462	if (vap->iv_opmode == IEEE80211_M_HOSTAP &&
463	    (vap->iv_caps & IEEE80211_C_DFS))
464		vap->iv_flags_ext |= IEEE80211_FEXT_DFS;
465
466	vap->iv_des_chan = IEEE80211_CHAN_ANYC;		/* any channel is ok */
467	vap->iv_bmissthreshold = IEEE80211_HWBMISS_DEFAULT;
468	vap->iv_dtim_period = IEEE80211_DTIM_DEFAULT;
469	/*
470	 * Install a default reset method for the ioctl support;
471	 * the driver can override this.
472	 */
473	vap->iv_reset = default_reset;
474
475	IEEE80211_ADDR_COPY(vap->iv_myaddr, macaddr);
476
477	ieee80211_sysctl_vattach(vap);
478	ieee80211_crypto_vattach(vap);
479	ieee80211_node_vattach(vap);
480	ieee80211_power_vattach(vap);
481	ieee80211_proto_vattach(vap);
482#ifdef IEEE80211_SUPPORT_SUPERG
483	ieee80211_superg_vattach(vap);
484#endif
485	ieee80211_ht_vattach(vap);
486	ieee80211_scan_vattach(vap);
487	ieee80211_regdomain_vattach(vap);
488	ieee80211_radiotap_vattach(vap);
489	ieee80211_ratectl_set(vap, IEEE80211_RATECTL_NONE);
490
491	return 0;
492}
493
494/*
495 * Activate a vap.  State should have been prepared with a
496 * call to ieee80211_vap_setup and by the driver.  On return
497 * from this call the vap is ready for use.
498 */
499int
500ieee80211_vap_attach(struct ieee80211vap *vap,
501	ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
502{
503	struct ifnet *ifp = vap->iv_ifp;
504	struct ieee80211com *ic = vap->iv_ic;
505	struct ifmediareq imr;
506	int maxrate;
507
508	IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
509	    "%s: %s parent %s flags 0x%x flags_ext 0x%x\n",
510	    __func__, ieee80211_opmode_name[vap->iv_opmode],
511	    ic->ic_ifp->if_xname, vap->iv_flags, vap->iv_flags_ext);
512
513	/*
514	 * Do late attach work that cannot happen until after
515	 * the driver has had a chance to override defaults.
516	 */
517	ieee80211_node_latevattach(vap);
518	ieee80211_power_latevattach(vap);
519
520	maxrate = ieee80211_media_setup(ic, &vap->iv_media, vap->iv_caps,
521	    vap->iv_opmode == IEEE80211_M_STA, media_change, media_stat);
522	ieee80211_media_status(ifp, &imr);
523	/* NB: strip explicit mode; we're actually in autoselect */
524	ifmedia_set(&vap->iv_media,
525	    imr.ifm_active &~ (IFM_MMASK | IFM_IEEE80211_TURBO));
526	if (maxrate)
527		ifp->if_baudrate = IF_Mbps(maxrate);
528
529	ether_ifattach(ifp, vap->iv_myaddr);
530	if (vap->iv_opmode == IEEE80211_M_MONITOR) {
531		/* NB: disallow transmit */
532		ifp->if_transmit = null_transmit;
533		ifp->if_output = null_output;
534	} else {
535		/* hook output method setup by ether_ifattach */
536		vap->iv_output = ifp->if_output;
537		ifp->if_output = ieee80211_output;
538	}
539	/* NB: if_mtu set by ether_ifattach to ETHERMTU */
540
541	IEEE80211_LOCK(ic);
542	TAILQ_INSERT_TAIL(&ic->ic_vaps, vap, iv_next);
543	ieee80211_syncflag_locked(ic, IEEE80211_F_WME);
544#ifdef IEEE80211_SUPPORT_SUPERG
545	ieee80211_syncflag_locked(ic, IEEE80211_F_TURBOP);
546#endif
547	ieee80211_syncflag_locked(ic, IEEE80211_F_PCF);
548	ieee80211_syncflag_locked(ic, IEEE80211_F_BURST);
549	ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_HT);
550	ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_USEHT40);
551	ieee80211_syncifflag_locked(ic, IFF_PROMISC);
552	ieee80211_syncifflag_locked(ic, IFF_ALLMULTI);
553	IEEE80211_UNLOCK(ic);
554
555	return 1;
556}
557
558/*
559 * Tear down vap state and reclaim the ifnet.
560 * The driver is assumed to have prepared for
561 * this; e.g. by turning off interrupts for the
562 * underlying device.
563 */
564void
565ieee80211_vap_detach(struct ieee80211vap *vap)
566{
567	struct ieee80211com *ic = vap->iv_ic;
568	struct ifnet *ifp = vap->iv_ifp;
569
570	IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s parent %s\n",
571	    __func__, ieee80211_opmode_name[vap->iv_opmode],
572	    ic->ic_ifp->if_xname);
573
574	/* NB: bpfdetach is called by ether_ifdetach and claims all taps */
575	ether_ifdetach(ifp);
576
577	ieee80211_stop(vap);
578
579	/*
580	 * Flush any deferred vap tasks.
581	 */
582	ieee80211_draintask(ic, &vap->iv_nstate_task);
583	ieee80211_draintask(ic, &vap->iv_swbmiss_task);
584
585	/* XXX band-aid until ifnet handles this for us */
586	taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
587
588	IEEE80211_LOCK(ic);
589	KASSERT(vap->iv_state == IEEE80211_S_INIT , ("vap still running"));
590	TAILQ_REMOVE(&ic->ic_vaps, vap, iv_next);
591	ieee80211_syncflag_locked(ic, IEEE80211_F_WME);
592#ifdef IEEE80211_SUPPORT_SUPERG
593	ieee80211_syncflag_locked(ic, IEEE80211_F_TURBOP);
594#endif
595	ieee80211_syncflag_locked(ic, IEEE80211_F_PCF);
596	ieee80211_syncflag_locked(ic, IEEE80211_F_BURST);
597	ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_HT);
598	ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_USEHT40);
599	/* NB: this handles the bpfdetach done below */
600	ieee80211_syncflag_ext_locked(ic, IEEE80211_FEXT_BPF);
601	ieee80211_syncifflag_locked(ic, IFF_PROMISC);
602	ieee80211_syncifflag_locked(ic, IFF_ALLMULTI);
603	IEEE80211_UNLOCK(ic);
604
605	ifmedia_removeall(&vap->iv_media);
606
607	ieee80211_radiotap_vdetach(vap);
608	ieee80211_regdomain_vdetach(vap);
609	ieee80211_scan_vdetach(vap);
610#ifdef IEEE80211_SUPPORT_SUPERG
611	ieee80211_superg_vdetach(vap);
612#endif
613	ieee80211_ht_vdetach(vap);
614	/* NB: must be before ieee80211_node_vdetach */
615	ieee80211_proto_vdetach(vap);
616	ieee80211_crypto_vdetach(vap);
617	ieee80211_power_vdetach(vap);
618	ieee80211_node_vdetach(vap);
619	ieee80211_sysctl_vdetach(vap);
620
621	if_free(ifp);
622}
623
624/*
625 * Synchronize flag bit state in the parent ifnet structure
626 * according to the state of all vap ifnet's.  This is used,
627 * for example, to handle IFF_PROMISC and IFF_ALLMULTI.
628 */
629void
630ieee80211_syncifflag_locked(struct ieee80211com *ic, int flag)
631{
632	struct ifnet *ifp = ic->ic_ifp;
633	struct ieee80211vap *vap;
634	int bit, oflags;
635
636	IEEE80211_LOCK_ASSERT(ic);
637
638	bit = 0;
639	TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
640		if (vap->iv_ifp->if_flags & flag) {
641			/*
642			 * XXX the bridge sets PROMISC but we don't want to
643			 * enable it on the device, discard here so all the
644			 * drivers don't need to special-case it
645			 */
646			if (flag == IFF_PROMISC &&
647			    !(vap->iv_opmode == IEEE80211_M_MONITOR ||
648			      (vap->iv_opmode == IEEE80211_M_AHDEMO &&
649			       (vap->iv_caps & IEEE80211_C_TDMA) == 0)))
650				continue;
651			bit = 1;
652			break;
653		}
654	oflags = ifp->if_flags;
655	if (bit)
656		ifp->if_flags |= flag;
657	else
658		ifp->if_flags &= ~flag;
659	if ((ifp->if_flags ^ oflags) & flag) {
660		/* XXX should we return 1/0 and let caller do this? */
661		if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
662			if (flag == IFF_PROMISC)
663				ieee80211_runtask(ic, &ic->ic_promisc_task);
664			else if (flag == IFF_ALLMULTI)
665				ieee80211_runtask(ic, &ic->ic_mcast_task);
666		}
667	}
668}
669
670/*
671 * Synchronize flag bit state in the com structure
672 * according to the state of all vap's.  This is used,
673 * for example, to handle state changes via ioctls.
674 */
675static void
676ieee80211_syncflag_locked(struct ieee80211com *ic, int flag)
677{
678	struct ieee80211vap *vap;
679	int bit;
680
681	IEEE80211_LOCK_ASSERT(ic);
682
683	bit = 0;
684	TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
685		if (vap->iv_flags & flag) {
686			bit = 1;
687			break;
688		}
689	if (bit)
690		ic->ic_flags |= flag;
691	else
692		ic->ic_flags &= ~flag;
693}
694
695void
696ieee80211_syncflag(struct ieee80211vap *vap, int flag)
697{
698	struct ieee80211com *ic = vap->iv_ic;
699
700	IEEE80211_LOCK(ic);
701	if (flag < 0) {
702		flag = -flag;
703		vap->iv_flags &= ~flag;
704	} else
705		vap->iv_flags |= flag;
706	ieee80211_syncflag_locked(ic, flag);
707	IEEE80211_UNLOCK(ic);
708}
709
710/*
711 * Synchronize flags_ht bit state in the com structure
712 * according to the state of all vap's.  This is used,
713 * for example, to handle state changes via ioctls.
714 */
715static void
716ieee80211_syncflag_ht_locked(struct ieee80211com *ic, int flag)
717{
718	struct ieee80211vap *vap;
719	int bit;
720
721	IEEE80211_LOCK_ASSERT(ic);
722
723	bit = 0;
724	TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
725		if (vap->iv_flags_ht & flag) {
726			bit = 1;
727			break;
728		}
729	if (bit)
730		ic->ic_flags_ht |= flag;
731	else
732		ic->ic_flags_ht &= ~flag;
733}
734
735void
736ieee80211_syncflag_ht(struct ieee80211vap *vap, int flag)
737{
738	struct ieee80211com *ic = vap->iv_ic;
739
740	IEEE80211_LOCK(ic);
741	if (flag < 0) {
742		flag = -flag;
743		vap->iv_flags_ht &= ~flag;
744	} else
745		vap->iv_flags_ht |= flag;
746	ieee80211_syncflag_ht_locked(ic, flag);
747	IEEE80211_UNLOCK(ic);
748}
749
750/*
751 * Synchronize flags_ext bit state in the com structure
752 * according to the state of all vap's.  This is used,
753 * for example, to handle state changes via ioctls.
754 */
755static void
756ieee80211_syncflag_ext_locked(struct ieee80211com *ic, int flag)
757{
758	struct ieee80211vap *vap;
759	int bit;
760
761	IEEE80211_LOCK_ASSERT(ic);
762
763	bit = 0;
764	TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
765		if (vap->iv_flags_ext & flag) {
766			bit = 1;
767			break;
768		}
769	if (bit)
770		ic->ic_flags_ext |= flag;
771	else
772		ic->ic_flags_ext &= ~flag;
773}
774
775void
776ieee80211_syncflag_ext(struct ieee80211vap *vap, int flag)
777{
778	struct ieee80211com *ic = vap->iv_ic;
779
780	IEEE80211_LOCK(ic);
781	if (flag < 0) {
782		flag = -flag;
783		vap->iv_flags_ext &= ~flag;
784	} else
785		vap->iv_flags_ext |= flag;
786	ieee80211_syncflag_ext_locked(ic, flag);
787	IEEE80211_UNLOCK(ic);
788}
789
790static __inline int
791mapgsm(u_int freq, u_int flags)
792{
793	freq *= 10;
794	if (flags & IEEE80211_CHAN_QUARTER)
795		freq += 5;
796	else if (flags & IEEE80211_CHAN_HALF)
797		freq += 10;
798	else
799		freq += 20;
800	/* NB: there is no 907/20 wide but leave room */
801	return (freq - 906*10) / 5;
802}
803
804static __inline int
805mappsb(u_int freq, u_int flags)
806{
807	return 37 + ((freq * 10) + ((freq % 5) == 2 ? 5 : 0) - 49400) / 5;
808}
809
810/*
811 * Convert MHz frequency to IEEE channel number.
812 */
813int
814ieee80211_mhz2ieee(u_int freq, u_int flags)
815{
816#define	IS_FREQ_IN_PSB(_freq) ((_freq) > 4940 && (_freq) < 4990)
817	if (flags & IEEE80211_CHAN_GSM)
818		return mapgsm(freq, flags);
819	if (flags & IEEE80211_CHAN_2GHZ) {	/* 2GHz band */
820		if (freq == 2484)
821			return 14;
822		if (freq < 2484)
823			return ((int) freq - 2407) / 5;
824		else
825			return 15 + ((freq - 2512) / 20);
826	} else if (flags & IEEE80211_CHAN_5GHZ) {	/* 5Ghz band */
827		if (freq <= 5000) {
828			/* XXX check regdomain? */
829			if (IS_FREQ_IN_PSB(freq))
830				return mappsb(freq, flags);
831			return (freq - 4000) / 5;
832		} else
833			return (freq - 5000) / 5;
834	} else {				/* either, guess */
835		if (freq == 2484)
836			return 14;
837		if (freq < 2484) {
838			if (907 <= freq && freq <= 922)
839				return mapgsm(freq, flags);
840			return ((int) freq - 2407) / 5;
841		}
842		if (freq < 5000) {
843			if (IS_FREQ_IN_PSB(freq))
844				return mappsb(freq, flags);
845			else if (freq > 4900)
846				return (freq - 4000) / 5;
847			else
848				return 15 + ((freq - 2512) / 20);
849		}
850		return (freq - 5000) / 5;
851	}
852#undef IS_FREQ_IN_PSB
853}
854
855/*
856 * Convert channel to IEEE channel number.
857 */
858int
859ieee80211_chan2ieee(struct ieee80211com *ic, const struct ieee80211_channel *c)
860{
861	if (c == NULL) {
862		if_printf(ic->ic_ifp, "invalid channel (NULL)\n");
863		return 0;		/* XXX */
864	}
865	return (c == IEEE80211_CHAN_ANYC ?  IEEE80211_CHAN_ANY : c->ic_ieee);
866}
867
868/*
869 * Convert IEEE channel number to MHz frequency.
870 */
871u_int
872ieee80211_ieee2mhz(u_int chan, u_int flags)
873{
874	if (flags & IEEE80211_CHAN_GSM)
875		return 907 + 5 * (chan / 10);
876	if (flags & IEEE80211_CHAN_2GHZ) {	/* 2GHz band */
877		if (chan == 14)
878			return 2484;
879		if (chan < 14)
880			return 2407 + chan*5;
881		else
882			return 2512 + ((chan-15)*20);
883	} else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */
884		if (flags & (IEEE80211_CHAN_HALF|IEEE80211_CHAN_QUARTER)) {
885			chan -= 37;
886			return 4940 + chan*5 + (chan % 5 ? 2 : 0);
887		}
888		return 5000 + (chan*5);
889	} else {				/* either, guess */
890		/* XXX can't distinguish PSB+GSM channels */
891		if (chan == 14)
892			return 2484;
893		if (chan < 14)			/* 0-13 */
894			return 2407 + chan*5;
895		if (chan < 27)			/* 15-26 */
896			return 2512 + ((chan-15)*20);
897		return 5000 + (chan*5);
898	}
899}
900
901/*
902 * Locate a channel given a frequency+flags.  We cache
903 * the previous lookup to optimize switching between two
904 * channels--as happens with dynamic turbo.
905 */
906struct ieee80211_channel *
907ieee80211_find_channel(struct ieee80211com *ic, int freq, int flags)
908{
909	struct ieee80211_channel *c;
910	int i;
911
912	flags &= IEEE80211_CHAN_ALLTURBO;
913	c = ic->ic_prevchan;
914	if (c != NULL && c->ic_freq == freq &&
915	    (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
916		return c;
917	/* brute force search */
918	for (i = 0; i < ic->ic_nchans; i++) {
919		c = &ic->ic_channels[i];
920		if (c->ic_freq == freq &&
921		    (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
922			return c;
923	}
924	return NULL;
925}
926
927/*
928 * Locate a channel given a channel number+flags.  We cache
929 * the previous lookup to optimize switching between two
930 * channels--as happens with dynamic turbo.
931 */
932struct ieee80211_channel *
933ieee80211_find_channel_byieee(struct ieee80211com *ic, int ieee, int flags)
934{
935	struct ieee80211_channel *c;
936	int i;
937
938	flags &= IEEE80211_CHAN_ALLTURBO;
939	c = ic->ic_prevchan;
940	if (c != NULL && c->ic_ieee == ieee &&
941	    (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
942		return c;
943	/* brute force search */
944	for (i = 0; i < ic->ic_nchans; i++) {
945		c = &ic->ic_channels[i];
946		if (c->ic_ieee == ieee &&
947		    (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
948			return c;
949	}
950	return NULL;
951}
952
953static void
954addmedia(struct ifmedia *media, int caps, int addsta, int mode, int mword)
955{
956#define	ADD(_ic, _s, _o) \
957	ifmedia_add(media, \
958		IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL)
959	static const u_int mopts[IEEE80211_MODE_MAX] = {
960	    [IEEE80211_MODE_AUTO]	= IFM_AUTO,
961	    [IEEE80211_MODE_11A]	= IFM_IEEE80211_11A,
962	    [IEEE80211_MODE_11B]	= IFM_IEEE80211_11B,
963	    [IEEE80211_MODE_11G]	= IFM_IEEE80211_11G,
964	    [IEEE80211_MODE_FH]		= IFM_IEEE80211_FH,
965	    [IEEE80211_MODE_TURBO_A]	= IFM_IEEE80211_11A|IFM_IEEE80211_TURBO,
966	    [IEEE80211_MODE_TURBO_G]	= IFM_IEEE80211_11G|IFM_IEEE80211_TURBO,
967	    [IEEE80211_MODE_STURBO_A]	= IFM_IEEE80211_11A|IFM_IEEE80211_TURBO,
968	    [IEEE80211_MODE_HALF]	= IFM_IEEE80211_11A,	/* XXX */
969	    [IEEE80211_MODE_QUARTER]	= IFM_IEEE80211_11A,	/* XXX */
970	    [IEEE80211_MODE_11NA]	= IFM_IEEE80211_11NA,
971	    [IEEE80211_MODE_11NG]	= IFM_IEEE80211_11NG,
972	};
973	u_int mopt;
974
975	mopt = mopts[mode];
976	if (addsta)
977		ADD(ic, mword, mopt);	/* STA mode has no cap */
978	if (caps & IEEE80211_C_IBSS)
979		ADD(media, mword, mopt | IFM_IEEE80211_ADHOC);
980	if (caps & IEEE80211_C_HOSTAP)
981		ADD(media, mword, mopt | IFM_IEEE80211_HOSTAP);
982	if (caps & IEEE80211_C_AHDEMO)
983		ADD(media, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
984	if (caps & IEEE80211_C_MONITOR)
985		ADD(media, mword, mopt | IFM_IEEE80211_MONITOR);
986	if (caps & IEEE80211_C_WDS)
987		ADD(media, mword, mopt | IFM_IEEE80211_WDS);
988	if (caps & IEEE80211_C_MBSS)
989		ADD(media, mword, mopt | IFM_IEEE80211_MBSS);
990#undef ADD
991}
992
993/*
994 * Setup the media data structures according to the channel and
995 * rate tables.
996 */
997static int
998ieee80211_media_setup(struct ieee80211com *ic,
999	struct ifmedia *media, int caps, int addsta,
1000	ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
1001{
1002	int i, j, mode, rate, maxrate, mword, r;
1003	const struct ieee80211_rateset *rs;
1004	struct ieee80211_rateset allrates;
1005
1006	/*
1007	 * Fill in media characteristics.
1008	 */
1009	ifmedia_init(media, 0, media_change, media_stat);
1010	maxrate = 0;
1011	/*
1012	 * Add media for legacy operating modes.
1013	 */
1014	memset(&allrates, 0, sizeof(allrates));
1015	for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_11NA; mode++) {
1016		if (isclr(ic->ic_modecaps, mode))
1017			continue;
1018		addmedia(media, caps, addsta, mode, IFM_AUTO);
1019		if (mode == IEEE80211_MODE_AUTO)
1020			continue;
1021		rs = &ic->ic_sup_rates[mode];
1022		for (i = 0; i < rs->rs_nrates; i++) {
1023			rate = rs->rs_rates[i];
1024			mword = ieee80211_rate2media(ic, rate, mode);
1025			if (mword == 0)
1026				continue;
1027			addmedia(media, caps, addsta, mode, mword);
1028			/*
1029			 * Add legacy rate to the collection of all rates.
1030			 */
1031			r = rate & IEEE80211_RATE_VAL;
1032			for (j = 0; j < allrates.rs_nrates; j++)
1033				if (allrates.rs_rates[j] == r)
1034					break;
1035			if (j == allrates.rs_nrates) {
1036				/* unique, add to the set */
1037				allrates.rs_rates[j] = r;
1038				allrates.rs_nrates++;
1039			}
1040			rate = (rate & IEEE80211_RATE_VAL) / 2;
1041			if (rate > maxrate)
1042				maxrate = rate;
1043		}
1044	}
1045	for (i = 0; i < allrates.rs_nrates; i++) {
1046		mword = ieee80211_rate2media(ic, allrates.rs_rates[i],
1047				IEEE80211_MODE_AUTO);
1048		if (mword == 0)
1049			continue;
1050		/* NB: remove media options from mword */
1051		addmedia(media, caps, addsta,
1052		    IEEE80211_MODE_AUTO, IFM_SUBTYPE(mword));
1053	}
1054	/*
1055	 * Add HT/11n media.  Note that we do not have enough
1056	 * bits in the media subtype to express the MCS so we
1057	 * use a "placeholder" media subtype and any fixed MCS
1058	 * must be specified with a different mechanism.
1059	 */
1060	for (; mode <= IEEE80211_MODE_11NG; mode++) {
1061		if (isclr(ic->ic_modecaps, mode))
1062			continue;
1063		addmedia(media, caps, addsta, mode, IFM_AUTO);
1064		addmedia(media, caps, addsta, mode, IFM_IEEE80211_MCS);
1065	}
1066	if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) ||
1067	    isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) {
1068		addmedia(media, caps, addsta,
1069		    IEEE80211_MODE_AUTO, IFM_IEEE80211_MCS);
1070		/* XXX could walk htrates */
1071		/* XXX known array size */
1072		if (ieee80211_htrates[15].ht40_rate_400ns > maxrate)
1073			maxrate = ieee80211_htrates[15].ht40_rate_400ns;
1074	}
1075	return maxrate;
1076}
1077
1078void
1079ieee80211_media_init(struct ieee80211com *ic)
1080{
1081	struct ifnet *ifp = ic->ic_ifp;
1082	int maxrate;
1083
1084	/* NB: this works because the structure is initialized to zero */
1085	if (!LIST_EMPTY(&ic->ic_media.ifm_list)) {
1086		/*
1087		 * We are re-initializing the channel list; clear
1088		 * the existing media state as the media routines
1089		 * don't suppress duplicates.
1090		 */
1091		ifmedia_removeall(&ic->ic_media);
1092	}
1093	ieee80211_chan_init(ic);
1094
1095	/*
1096	 * Recalculate media settings in case new channel list changes
1097	 * the set of available modes.
1098	 */
1099	maxrate = ieee80211_media_setup(ic, &ic->ic_media, ic->ic_caps, 1,
1100		ieee80211com_media_change, ieee80211com_media_status);
1101	/* NB: strip explicit mode; we're actually in autoselect */
1102	ifmedia_set(&ic->ic_media,
1103	    media_status(ic->ic_opmode, ic->ic_curchan) &~
1104		(IFM_MMASK | IFM_IEEE80211_TURBO));
1105	if (maxrate)
1106		ifp->if_baudrate = IF_Mbps(maxrate);
1107
1108	/* XXX need to propagate new media settings to vap's */
1109}
1110
1111/* XXX inline or eliminate? */
1112const struct ieee80211_rateset *
1113ieee80211_get_suprates(struct ieee80211com *ic, const struct ieee80211_channel *c)
1114{
1115	/* XXX does this work for 11ng basic rates? */
1116	return &ic->ic_sup_rates[ieee80211_chan2mode(c)];
1117}
1118
1119void
1120ieee80211_announce(struct ieee80211com *ic)
1121{
1122	struct ifnet *ifp = ic->ic_ifp;
1123	int i, mode, rate, mword;
1124	const struct ieee80211_rateset *rs;
1125
1126	/* NB: skip AUTO since it has no rates */
1127	for (mode = IEEE80211_MODE_AUTO+1; mode < IEEE80211_MODE_11NA; mode++) {
1128		if (isclr(ic->ic_modecaps, mode))
1129			continue;
1130		if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]);
1131		rs = &ic->ic_sup_rates[mode];
1132		for (i = 0; i < rs->rs_nrates; i++) {
1133			mword = ieee80211_rate2media(ic, rs->rs_rates[i], mode);
1134			if (mword == 0)
1135				continue;
1136			rate = ieee80211_media2rate(mword);
1137			printf("%s%d%sMbps", (i != 0 ? " " : ""),
1138			    rate / 2, ((rate & 0x1) != 0 ? ".5" : ""));
1139		}
1140		printf("\n");
1141	}
1142	ieee80211_ht_announce(ic);
1143}
1144
1145void
1146ieee80211_announce_channels(struct ieee80211com *ic)
1147{
1148	const struct ieee80211_channel *c;
1149	char type;
1150	int i, cw;
1151
1152	printf("Chan  Freq  CW  RegPwr  MinPwr  MaxPwr\n");
1153	for (i = 0; i < ic->ic_nchans; i++) {
1154		c = &ic->ic_channels[i];
1155		if (IEEE80211_IS_CHAN_ST(c))
1156			type = 'S';
1157		else if (IEEE80211_IS_CHAN_108A(c))
1158			type = 'T';
1159		else if (IEEE80211_IS_CHAN_108G(c))
1160			type = 'G';
1161		else if (IEEE80211_IS_CHAN_HT(c))
1162			type = 'n';
1163		else if (IEEE80211_IS_CHAN_A(c))
1164			type = 'a';
1165		else if (IEEE80211_IS_CHAN_ANYG(c))
1166			type = 'g';
1167		else if (IEEE80211_IS_CHAN_B(c))
1168			type = 'b';
1169		else
1170			type = 'f';
1171		if (IEEE80211_IS_CHAN_HT40(c) || IEEE80211_IS_CHAN_TURBO(c))
1172			cw = 40;
1173		else if (IEEE80211_IS_CHAN_HALF(c))
1174			cw = 10;
1175		else if (IEEE80211_IS_CHAN_QUARTER(c))
1176			cw = 5;
1177		else
1178			cw = 20;
1179		printf("%4d  %4d%c %2d%c %6d  %4d.%d  %4d.%d\n"
1180			, c->ic_ieee, c->ic_freq, type
1181			, cw
1182			, IEEE80211_IS_CHAN_HT40U(c) ? '+' :
1183			  IEEE80211_IS_CHAN_HT40D(c) ? '-' : ' '
1184			, c->ic_maxregpower
1185			, c->ic_minpower / 2, c->ic_minpower & 1 ? 5 : 0
1186			, c->ic_maxpower / 2, c->ic_maxpower & 1 ? 5 : 0
1187		);
1188	}
1189}
1190
1191static int
1192media2mode(const struct ifmedia_entry *ime, uint32_t flags, uint16_t *mode)
1193{
1194	switch (IFM_MODE(ime->ifm_media)) {
1195	case IFM_IEEE80211_11A:
1196		*mode = IEEE80211_MODE_11A;
1197		break;
1198	case IFM_IEEE80211_11B:
1199		*mode = IEEE80211_MODE_11B;
1200		break;
1201	case IFM_IEEE80211_11G:
1202		*mode = IEEE80211_MODE_11G;
1203		break;
1204	case IFM_IEEE80211_FH:
1205		*mode = IEEE80211_MODE_FH;
1206		break;
1207	case IFM_IEEE80211_11NA:
1208		*mode = IEEE80211_MODE_11NA;
1209		break;
1210	case IFM_IEEE80211_11NG:
1211		*mode = IEEE80211_MODE_11NG;
1212		break;
1213	case IFM_AUTO:
1214		*mode = IEEE80211_MODE_AUTO;
1215		break;
1216	default:
1217		return 0;
1218	}
1219	/*
1220	 * Turbo mode is an ``option''.
1221	 * XXX does not apply to AUTO
1222	 */
1223	if (ime->ifm_media & IFM_IEEE80211_TURBO) {
1224		if (*mode == IEEE80211_MODE_11A) {
1225			if (flags & IEEE80211_F_TURBOP)
1226				*mode = IEEE80211_MODE_TURBO_A;
1227			else
1228				*mode = IEEE80211_MODE_STURBO_A;
1229		} else if (*mode == IEEE80211_MODE_11G)
1230			*mode = IEEE80211_MODE_TURBO_G;
1231		else
1232			return 0;
1233	}
1234	/* XXX HT40 +/- */
1235	return 1;
1236}
1237
1238/*
1239 * Handle a media change request on the underlying interface.
1240 */
1241int
1242ieee80211com_media_change(struct ifnet *ifp)
1243{
1244	return EINVAL;
1245}
1246
1247/*
1248 * Handle a media change request on the vap interface.
1249 */
1250int
1251ieee80211_media_change(struct ifnet *ifp)
1252{
1253	struct ieee80211vap *vap = ifp->if_softc;
1254	struct ifmedia_entry *ime = vap->iv_media.ifm_cur;
1255	uint16_t newmode;
1256
1257	if (!media2mode(ime, vap->iv_flags, &newmode))
1258		return EINVAL;
1259	if (vap->iv_des_mode != newmode) {
1260		vap->iv_des_mode = newmode;
1261		/* XXX kick state machine if up+running */
1262	}
1263	return 0;
1264}
1265
1266/*
1267 * Common code to calculate the media status word
1268 * from the operating mode and channel state.
1269 */
1270static int
1271media_status(enum ieee80211_opmode opmode, const struct ieee80211_channel *chan)
1272{
1273	int status;
1274
1275	status = IFM_IEEE80211;
1276	switch (opmode) {
1277	case IEEE80211_M_STA:
1278		break;
1279	case IEEE80211_M_IBSS:
1280		status |= IFM_IEEE80211_ADHOC;
1281		break;
1282	case IEEE80211_M_HOSTAP:
1283		status |= IFM_IEEE80211_HOSTAP;
1284		break;
1285	case IEEE80211_M_MONITOR:
1286		status |= IFM_IEEE80211_MONITOR;
1287		break;
1288	case IEEE80211_M_AHDEMO:
1289		status |= IFM_IEEE80211_ADHOC | IFM_FLAG0;
1290		break;
1291	case IEEE80211_M_WDS:
1292		status |= IFM_IEEE80211_WDS;
1293		break;
1294	case IEEE80211_M_MBSS:
1295		status |= IFM_IEEE80211_MBSS;
1296		break;
1297	}
1298	if (IEEE80211_IS_CHAN_HTA(chan)) {
1299		status |= IFM_IEEE80211_11NA;
1300	} else if (IEEE80211_IS_CHAN_HTG(chan)) {
1301		status |= IFM_IEEE80211_11NG;
1302	} else if (IEEE80211_IS_CHAN_A(chan)) {
1303		status |= IFM_IEEE80211_11A;
1304	} else if (IEEE80211_IS_CHAN_B(chan)) {
1305		status |= IFM_IEEE80211_11B;
1306	} else if (IEEE80211_IS_CHAN_ANYG(chan)) {
1307		status |= IFM_IEEE80211_11G;
1308	} else if (IEEE80211_IS_CHAN_FHSS(chan)) {
1309		status |= IFM_IEEE80211_FH;
1310	}
1311	/* XXX else complain? */
1312
1313	if (IEEE80211_IS_CHAN_TURBO(chan))
1314		status |= IFM_IEEE80211_TURBO;
1315#if 0
1316	if (IEEE80211_IS_CHAN_HT20(chan))
1317		status |= IFM_IEEE80211_HT20;
1318	if (IEEE80211_IS_CHAN_HT40(chan))
1319		status |= IFM_IEEE80211_HT40;
1320#endif
1321	return status;
1322}
1323
1324static void
1325ieee80211com_media_status(struct ifnet *ifp, struct ifmediareq *imr)
1326{
1327	struct ieee80211com *ic = ifp->if_l2com;
1328	struct ieee80211vap *vap;
1329
1330	imr->ifm_status = IFM_AVALID;
1331	TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
1332		if (vap->iv_ifp->if_flags & IFF_UP) {
1333			imr->ifm_status |= IFM_ACTIVE;
1334			break;
1335		}
1336	imr->ifm_active = media_status(ic->ic_opmode, ic->ic_curchan);
1337	if (imr->ifm_status & IFM_ACTIVE)
1338		imr->ifm_current = imr->ifm_active;
1339}
1340
1341void
1342ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr)
1343{
1344	struct ieee80211vap *vap = ifp->if_softc;
1345	struct ieee80211com *ic = vap->iv_ic;
1346	enum ieee80211_phymode mode;
1347
1348	imr->ifm_status = IFM_AVALID;
1349	/*
1350	 * NB: use the current channel's mode to lock down a xmit
1351	 * rate only when running; otherwise we may have a mismatch
1352	 * in which case the rate will not be convertible.
1353	 */
1354	if (vap->iv_state == IEEE80211_S_RUN) {
1355		imr->ifm_status |= IFM_ACTIVE;
1356		mode = ieee80211_chan2mode(ic->ic_curchan);
1357	} else
1358		mode = IEEE80211_MODE_AUTO;
1359	imr->ifm_active = media_status(vap->iv_opmode, ic->ic_curchan);
1360	/*
1361	 * Calculate a current rate if possible.
1362	 */
1363	if (vap->iv_txparms[mode].ucastrate != IEEE80211_FIXED_RATE_NONE) {
1364		/*
1365		 * A fixed rate is set, report that.
1366		 */
1367		imr->ifm_active |= ieee80211_rate2media(ic,
1368			vap->iv_txparms[mode].ucastrate, mode);
1369	} else if (vap->iv_opmode == IEEE80211_M_STA) {
1370		/*
1371		 * In station mode report the current transmit rate.
1372		 */
1373		imr->ifm_active |= ieee80211_rate2media(ic,
1374			vap->iv_bss->ni_txrate, mode);
1375	} else
1376		imr->ifm_active |= IFM_AUTO;
1377	if (imr->ifm_status & IFM_ACTIVE)
1378		imr->ifm_current = imr->ifm_active;
1379}
1380
1381/*
1382 * Set the current phy mode and recalculate the active channel
1383 * set based on the available channels for this mode.  Also
1384 * select a new default/current channel if the current one is
1385 * inappropriate for this mode.
1386 */
1387int
1388ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode)
1389{
1390	/*
1391	 * Adjust basic rates in 11b/11g supported rate set.
1392	 * Note that if operating on a hal/quarter rate channel
1393	 * this is a noop as those rates sets are different
1394	 * and used instead.
1395	 */
1396	if (mode == IEEE80211_MODE_11G || mode == IEEE80211_MODE_11B)
1397		ieee80211_setbasicrates(&ic->ic_sup_rates[mode], mode);
1398
1399	ic->ic_curmode = mode;
1400	ieee80211_reset_erp(ic);	/* reset ERP state */
1401
1402	return 0;
1403}
1404
1405/*
1406 * Return the phy mode for with the specified channel.
1407 */
1408enum ieee80211_phymode
1409ieee80211_chan2mode(const struct ieee80211_channel *chan)
1410{
1411
1412	if (IEEE80211_IS_CHAN_HTA(chan))
1413		return IEEE80211_MODE_11NA;
1414	else if (IEEE80211_IS_CHAN_HTG(chan))
1415		return IEEE80211_MODE_11NG;
1416	else if (IEEE80211_IS_CHAN_108G(chan))
1417		return IEEE80211_MODE_TURBO_G;
1418	else if (IEEE80211_IS_CHAN_ST(chan))
1419		return IEEE80211_MODE_STURBO_A;
1420	else if (IEEE80211_IS_CHAN_TURBO(chan))
1421		return IEEE80211_MODE_TURBO_A;
1422	else if (IEEE80211_IS_CHAN_HALF(chan))
1423		return IEEE80211_MODE_HALF;
1424	else if (IEEE80211_IS_CHAN_QUARTER(chan))
1425		return IEEE80211_MODE_QUARTER;
1426	else if (IEEE80211_IS_CHAN_A(chan))
1427		return IEEE80211_MODE_11A;
1428	else if (IEEE80211_IS_CHAN_ANYG(chan))
1429		return IEEE80211_MODE_11G;
1430	else if (IEEE80211_IS_CHAN_B(chan))
1431		return IEEE80211_MODE_11B;
1432	else if (IEEE80211_IS_CHAN_FHSS(chan))
1433		return IEEE80211_MODE_FH;
1434
1435	/* NB: should not get here */
1436	printf("%s: cannot map channel to mode; freq %u flags 0x%x\n",
1437		__func__, chan->ic_freq, chan->ic_flags);
1438	return IEEE80211_MODE_11B;
1439}
1440
1441struct ratemedia {
1442	u_int	match;	/* rate + mode */
1443	u_int	media;	/* if_media rate */
1444};
1445
1446static int
1447findmedia(const struct ratemedia rates[], int n, u_int match)
1448{
1449	int i;
1450
1451	for (i = 0; i < n; i++)
1452		if (rates[i].match == match)
1453			return rates[i].media;
1454	return IFM_AUTO;
1455}
1456
1457/*
1458 * Convert IEEE80211 rate value to ifmedia subtype.
1459 * Rate is either a legacy rate in units of 0.5Mbps
1460 * or an MCS index.
1461 */
1462int
1463ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode)
1464{
1465#define	N(a)	(sizeof(a) / sizeof(a[0]))
1466	static const struct ratemedia rates[] = {
1467		{   2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 },
1468		{   4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 },
1469		{   2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 },
1470		{   4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 },
1471		{  11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 },
1472		{  22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 },
1473		{  44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 },
1474		{  12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 },
1475		{  18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 },
1476		{  24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 },
1477		{  36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 },
1478		{  48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 },
1479		{  72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 },
1480		{  96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 },
1481		{ 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 },
1482		{   2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 },
1483		{   4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 },
1484		{  11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 },
1485		{  22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 },
1486		{  12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 },
1487		{  18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 },
1488		{  24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 },
1489		{  36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 },
1490		{  48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 },
1491		{  72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 },
1492		{  96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 },
1493		{ 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 },
1494		{   6 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM3 },
1495		{   9 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM4 },
1496		{  54 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM27 },
1497		/* NB: OFDM72 doesn't realy exist so we don't handle it */
1498	};
1499	static const struct ratemedia htrates[] = {
1500		{   0, IFM_IEEE80211_MCS },
1501		{   1, IFM_IEEE80211_MCS },
1502		{   2, IFM_IEEE80211_MCS },
1503		{   3, IFM_IEEE80211_MCS },
1504		{   4, IFM_IEEE80211_MCS },
1505		{   5, IFM_IEEE80211_MCS },
1506		{   6, IFM_IEEE80211_MCS },
1507		{   7, IFM_IEEE80211_MCS },
1508		{   8, IFM_IEEE80211_MCS },
1509		{   9, IFM_IEEE80211_MCS },
1510		{  10, IFM_IEEE80211_MCS },
1511		{  11, IFM_IEEE80211_MCS },
1512		{  12, IFM_IEEE80211_MCS },
1513		{  13, IFM_IEEE80211_MCS },
1514		{  14, IFM_IEEE80211_MCS },
1515		{  15, IFM_IEEE80211_MCS },
1516		{  16, IFM_IEEE80211_MCS },
1517		{  17, IFM_IEEE80211_MCS },
1518		{  18, IFM_IEEE80211_MCS },
1519		{  19, IFM_IEEE80211_MCS },
1520		{  20, IFM_IEEE80211_MCS },
1521		{  21, IFM_IEEE80211_MCS },
1522		{  22, IFM_IEEE80211_MCS },
1523		{  23, IFM_IEEE80211_MCS },
1524		{  24, IFM_IEEE80211_MCS },
1525		{  25, IFM_IEEE80211_MCS },
1526		{  26, IFM_IEEE80211_MCS },
1527		{  27, IFM_IEEE80211_MCS },
1528		{  28, IFM_IEEE80211_MCS },
1529		{  29, IFM_IEEE80211_MCS },
1530		{  30, IFM_IEEE80211_MCS },
1531		{  31, IFM_IEEE80211_MCS },
1532		{  32, IFM_IEEE80211_MCS },
1533		{  33, IFM_IEEE80211_MCS },
1534		{  34, IFM_IEEE80211_MCS },
1535		{  35, IFM_IEEE80211_MCS },
1536		{  36, IFM_IEEE80211_MCS },
1537		{  37, IFM_IEEE80211_MCS },
1538		{  38, IFM_IEEE80211_MCS },
1539		{  39, IFM_IEEE80211_MCS },
1540		{  40, IFM_IEEE80211_MCS },
1541		{  41, IFM_IEEE80211_MCS },
1542		{  42, IFM_IEEE80211_MCS },
1543		{  43, IFM_IEEE80211_MCS },
1544		{  44, IFM_IEEE80211_MCS },
1545		{  45, IFM_IEEE80211_MCS },
1546		{  46, IFM_IEEE80211_MCS },
1547		{  47, IFM_IEEE80211_MCS },
1548		{  48, IFM_IEEE80211_MCS },
1549		{  49, IFM_IEEE80211_MCS },
1550		{  50, IFM_IEEE80211_MCS },
1551		{  51, IFM_IEEE80211_MCS },
1552		{  52, IFM_IEEE80211_MCS },
1553		{  53, IFM_IEEE80211_MCS },
1554		{  54, IFM_IEEE80211_MCS },
1555		{  55, IFM_IEEE80211_MCS },
1556		{  56, IFM_IEEE80211_MCS },
1557		{  57, IFM_IEEE80211_MCS },
1558		{  58, IFM_IEEE80211_MCS },
1559		{  59, IFM_IEEE80211_MCS },
1560		{  60, IFM_IEEE80211_MCS },
1561		{  61, IFM_IEEE80211_MCS },
1562		{  62, IFM_IEEE80211_MCS },
1563		{  63, IFM_IEEE80211_MCS },
1564		{  64, IFM_IEEE80211_MCS },
1565		{  65, IFM_IEEE80211_MCS },
1566		{  66, IFM_IEEE80211_MCS },
1567		{  67, IFM_IEEE80211_MCS },
1568		{  68, IFM_IEEE80211_MCS },
1569		{  69, IFM_IEEE80211_MCS },
1570		{  70, IFM_IEEE80211_MCS },
1571		{  71, IFM_IEEE80211_MCS },
1572		{  72, IFM_IEEE80211_MCS },
1573		{  73, IFM_IEEE80211_MCS },
1574		{  74, IFM_IEEE80211_MCS },
1575		{  75, IFM_IEEE80211_MCS },
1576		{  76, IFM_IEEE80211_MCS },
1577	};
1578	int m;
1579
1580	/*
1581	 * Check 11n rates first for match as an MCS.
1582	 */
1583	if (mode == IEEE80211_MODE_11NA) {
1584		if (rate & IEEE80211_RATE_MCS) {
1585			rate &= ~IEEE80211_RATE_MCS;
1586			m = findmedia(htrates, N(htrates), rate);
1587			if (m != IFM_AUTO)
1588				return m | IFM_IEEE80211_11NA;
1589		}
1590	} else if (mode == IEEE80211_MODE_11NG) {
1591		/* NB: 12 is ambiguous, it will be treated as an MCS */
1592		if (rate & IEEE80211_RATE_MCS) {
1593			rate &= ~IEEE80211_RATE_MCS;
1594			m = findmedia(htrates, N(htrates), rate);
1595			if (m != IFM_AUTO)
1596				return m | IFM_IEEE80211_11NG;
1597		}
1598	}
1599	rate &= IEEE80211_RATE_VAL;
1600	switch (mode) {
1601	case IEEE80211_MODE_11A:
1602	case IEEE80211_MODE_HALF:		/* XXX good 'nuf */
1603	case IEEE80211_MODE_QUARTER:
1604	case IEEE80211_MODE_11NA:
1605	case IEEE80211_MODE_TURBO_A:
1606	case IEEE80211_MODE_STURBO_A:
1607		return findmedia(rates, N(rates), rate | IFM_IEEE80211_11A);
1608	case IEEE80211_MODE_11B:
1609		return findmedia(rates, N(rates), rate | IFM_IEEE80211_11B);
1610	case IEEE80211_MODE_FH:
1611		return findmedia(rates, N(rates), rate | IFM_IEEE80211_FH);
1612	case IEEE80211_MODE_AUTO:
1613		/* NB: ic may be NULL for some drivers */
1614		if (ic != NULL && ic->ic_phytype == IEEE80211_T_FH)
1615			return findmedia(rates, N(rates),
1616			    rate | IFM_IEEE80211_FH);
1617		/* NB: hack, 11g matches both 11b+11a rates */
1618		/* fall thru... */
1619	case IEEE80211_MODE_11G:
1620	case IEEE80211_MODE_11NG:
1621	case IEEE80211_MODE_TURBO_G:
1622		return findmedia(rates, N(rates), rate | IFM_IEEE80211_11G);
1623	}
1624	return IFM_AUTO;
1625#undef N
1626}
1627
1628int
1629ieee80211_media2rate(int mword)
1630{
1631#define	N(a)	(sizeof(a) / sizeof(a[0]))
1632	static const int ieeerates[] = {
1633		-1,		/* IFM_AUTO */
1634		0,		/* IFM_MANUAL */
1635		0,		/* IFM_NONE */
1636		2,		/* IFM_IEEE80211_FH1 */
1637		4,		/* IFM_IEEE80211_FH2 */
1638		2,		/* IFM_IEEE80211_DS1 */
1639		4,		/* IFM_IEEE80211_DS2 */
1640		11,		/* IFM_IEEE80211_DS5 */
1641		22,		/* IFM_IEEE80211_DS11 */
1642		44,		/* IFM_IEEE80211_DS22 */
1643		12,		/* IFM_IEEE80211_OFDM6 */
1644		18,		/* IFM_IEEE80211_OFDM9 */
1645		24,		/* IFM_IEEE80211_OFDM12 */
1646		36,		/* IFM_IEEE80211_OFDM18 */
1647		48,		/* IFM_IEEE80211_OFDM24 */
1648		72,		/* IFM_IEEE80211_OFDM36 */
1649		96,		/* IFM_IEEE80211_OFDM48 */
1650		108,		/* IFM_IEEE80211_OFDM54 */
1651		144,		/* IFM_IEEE80211_OFDM72 */
1652		0,		/* IFM_IEEE80211_DS354k */
1653		0,		/* IFM_IEEE80211_DS512k */
1654		6,		/* IFM_IEEE80211_OFDM3 */
1655		9,		/* IFM_IEEE80211_OFDM4 */
1656		54,		/* IFM_IEEE80211_OFDM27 */
1657		-1,		/* IFM_IEEE80211_MCS */
1658	};
1659	return IFM_SUBTYPE(mword) < N(ieeerates) ?
1660		ieeerates[IFM_SUBTYPE(mword)] : 0;
1661#undef N
1662}
1663
1664/*
1665 * The following hash function is adapted from "Hash Functions" by Bob Jenkins
1666 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
1667 */
1668#define	mix(a, b, c)							\
1669do {									\
1670	a -= b; a -= c; a ^= (c >> 13);					\
1671	b -= c; b -= a; b ^= (a << 8);					\
1672	c -= a; c -= b; c ^= (b >> 13);					\
1673	a -= b; a -= c; a ^= (c >> 12);					\
1674	b -= c; b -= a; b ^= (a << 16);					\
1675	c -= a; c -= b; c ^= (b >> 5);					\
1676	a -= b; a -= c; a ^= (c >> 3);					\
1677	b -= c; b -= a; b ^= (a << 10);					\
1678	c -= a; c -= b; c ^= (b >> 15);					\
1679} while (/*CONSTCOND*/0)
1680
1681uint32_t
1682ieee80211_mac_hash(const struct ieee80211com *ic,
1683	const uint8_t addr[IEEE80211_ADDR_LEN])
1684{
1685	uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = ic->ic_hash_key;
1686
1687	b += addr[5] << 8;
1688	b += addr[4];
1689	a += addr[3] << 24;
1690	a += addr[2] << 16;
1691	a += addr[1] << 8;
1692	a += addr[0];
1693
1694	mix(a, b, c);
1695
1696	return c;
1697}
1698#undef mix
1699