xref: /freebsd/sys/net80211/ieee80211_wds.c (revision 9a14aa017b21c292740c00ee098195cd46642730)
1 /*-
2  * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24  */
25 
26 #include <sys/cdefs.h>
27 #ifdef __FreeBSD__
28 __FBSDID("$FreeBSD$");
29 #endif
30 
31 /*
32  * IEEE 802.11 WDS mode support.
33  */
34 #include "opt_inet.h"
35 #include "opt_wlan.h"
36 
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/mbuf.h>
40 #include <sys/malloc.h>
41 #include <sys/kernel.h>
42 
43 #include <sys/socket.h>
44 #include <sys/sockio.h>
45 #include <sys/endian.h>
46 #include <sys/errno.h>
47 #include <sys/proc.h>
48 #include <sys/sysctl.h>
49 
50 #include <net/if.h>
51 #include <net/if_media.h>
52 #include <net/if_llc.h>
53 #include <net/ethernet.h>
54 
55 #include <net/bpf.h>
56 
57 #include <net80211/ieee80211_var.h>
58 #include <net80211/ieee80211_wds.h>
59 #include <net80211/ieee80211_input.h>
60 #ifdef IEEE80211_SUPPORT_SUPERG
61 #include <net80211/ieee80211_superg.h>
62 #endif
63 
64 static void wds_vattach(struct ieee80211vap *);
65 static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int);
66 static	int wds_input(struct ieee80211_node *ni, struct mbuf *m, int, int);
67 static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *,
68 	    int subtype, int, int);
69 
70 void
71 ieee80211_wds_attach(struct ieee80211com *ic)
72 {
73 	ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach;
74 }
75 
76 void
77 ieee80211_wds_detach(struct ieee80211com *ic)
78 {
79 }
80 
81 static void
82 wds_vdetach(struct ieee80211vap *vap)
83 {
84 	if (vap->iv_bss != NULL) {
85 		/* XXX locking? */
86 		if (vap->iv_bss->ni_wdsvap == vap)
87 			vap->iv_bss->ni_wdsvap = NULL;
88 	}
89 }
90 
91 static void
92 wds_vattach(struct ieee80211vap *vap)
93 {
94 	vap->iv_newstate = wds_newstate;
95 	vap->iv_input = wds_input;
96 	vap->iv_recv_mgmt = wds_recv_mgmt;
97 	vap->iv_opdetach = wds_vdetach;
98 }
99 
100 static void
101 wds_flush(struct ieee80211_node *ni)
102 {
103 	struct ieee80211com *ic = ni->ni_ic;
104 	struct mbuf *m, *next;
105 	int8_t rssi, nf;
106 
107 	m = ieee80211_ageq_remove(&ic->ic_stageq,
108 	    (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr));
109 	if (m == NULL)
110 		return;
111 
112 	IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni,
113 	    "%s", "flush wds queue");
114 	ic->ic_node_getsignal(ni, &rssi, &nf);
115 	for (; m != NULL; m = next) {
116 		next = m->m_nextpkt;
117 		m->m_nextpkt = NULL;
118 		ieee80211_input(ni, m, rssi, nf);
119 	}
120 }
121 
122 static int
123 ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan)
124 {
125 	struct ieee80211com *ic = vap->iv_ic;
126 	struct ieee80211_node_table *nt = &ic->ic_sta;
127 	struct ieee80211_node *ni, *obss;
128 
129 	IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
130 	     "%s: creating link to %s on channel %u\n", __func__,
131 	     ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan));
132 
133 	/* NB: vap create must specify the bssid for the link */
134 	KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid"));
135 	/* NB: we should only be called on RUN transition */
136 	KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state"));
137 
138 	if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
139 		/*
140 		 * Dynamic/non-legacy WDS.  Reference the associated
141 		 * station specified by the desired bssid setup at vap
142 		 * create.  Point ni_wdsvap at the WDS vap so 4-address
143 		 * frames received through the associated AP vap will
144 		 * be dispatched upward (e.g. to a bridge) as though
145 		 * they arrived on the WDS vap.
146 		 */
147 		IEEE80211_NODE_LOCK(nt);
148 		obss = NULL;
149 		ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid);
150 		if (ni == NULL) {
151 			/*
152 			 * Node went away before we could hookup.  This
153 			 * should be ok; no traffic will flow and a leave
154 			 * event will be dispatched that should cause
155 			 * the vap to be destroyed.
156 			 */
157 			IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
158 			    "%s: station %s went away\n",
159 			    __func__, ether_sprintf(vap->iv_des_bssid));
160 			/* XXX stat? */
161 		} else if (ni->ni_wdsvap != NULL) {
162 			/*
163 			 * Node already setup with a WDS vap; we cannot
164 			 * allow multiple references so disallow.  If
165 			 * ni_wdsvap points at us that's ok; we should
166 			 * do nothing anyway.
167 			 */
168 			/* XXX printf instead? */
169 			IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
170 			    "%s: station %s in use with %s\n",
171 			    __func__, ether_sprintf(vap->iv_des_bssid),
172 			    ni->ni_wdsvap->iv_ifp->if_xname);
173 			/* XXX stat? */
174 		} else {
175 			/*
176 			 * Committed to new node, setup state.
177 			 */
178 			obss = vap->iv_bss;
179 			vap->iv_bss = ni;
180 			ni->ni_wdsvap = vap;
181 		}
182 		IEEE80211_NODE_UNLOCK(nt);
183 		if (obss != NULL) {
184 			/* NB: deferred to avoid recursive lock */
185 			ieee80211_free_node(obss);
186 		}
187 	} else {
188 		/*
189 		 * Legacy WDS vap setup.
190 		 */
191 		/*
192 		 * The far end does not associate so we just create
193 		 * create a new node and install it as the vap's
194 		 * bss node.  We must simulate an association and
195 		 * authorize the port for traffic to flow.
196 		 * XXX check if node already in sta table?
197 		 */
198 		ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan);
199 		if (ni != NULL) {
200 			obss = vap->iv_bss;
201 			vap->iv_bss = ieee80211_ref_node(ni);
202 			ni->ni_flags |= IEEE80211_NODE_AREF;
203 			if (obss != NULL)
204 				ieee80211_free_node(obss);
205 			/* give driver a chance to setup state like ni_txrate */
206 			if (ic->ic_newassoc != NULL)
207 				ic->ic_newassoc(ni, 1);
208 			/* tell the authenticator about new station */
209 			if (vap->iv_auth->ia_node_join != NULL)
210 				vap->iv_auth->ia_node_join(ni);
211 			if (ni->ni_authmode != IEEE80211_AUTH_8021X)
212 				ieee80211_node_authorize(ni);
213 
214 			ieee80211_notify_node_join(ni, 1 /*newassoc*/);
215 			/* XXX inject l2uf frame */
216 		}
217 	}
218 
219 	/*
220 	 * Flush any pending frames now that were setup.
221 	 */
222 	if (ni != NULL)
223 		wds_flush(ni);
224 	return (ni == NULL ? ENOENT : 0);
225 }
226 
227 /*
228  * Propagate multicast frames of an ap vap to all DWDS links.
229  * The caller is assumed to have verified this frame is multicast.
230  */
231 void
232 ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m)
233 {
234 	struct ieee80211com *ic = vap0->iv_ic;
235 	struct ifnet *parent = ic->ic_ifp;
236 	const struct ether_header *eh = mtod(m, const struct ether_header *);
237 	struct ieee80211_node *ni;
238 	struct ieee80211vap *vap;
239 	struct ifnet *ifp;
240 	struct mbuf *mcopy;
241 	int err;
242 
243 	KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost),
244 	    ("%s not mcast", ether_sprintf(eh->ether_dhost)));
245 
246 	/* XXX locking */
247 	TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
248 		/* only DWDS vaps are interesting */
249 		if (vap->iv_opmode != IEEE80211_M_WDS ||
250 		    (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))
251 			continue;
252 		/* if it came in this interface, don't send it back out */
253 		ifp = vap->iv_ifp;
254 		if (ifp == m->m_pkthdr.rcvif)
255 			continue;
256 		/*
257 		 * Duplicate the frame and send it.
258 		 */
259 		mcopy = m_copypacket(m, M_DONTWAIT);
260 		if (mcopy == NULL) {
261 			ifp->if_oerrors++;
262 			/* XXX stat + msg */
263 			continue;
264 		}
265 		ni = ieee80211_find_txnode(vap, eh->ether_dhost);
266 		if (ni == NULL) {
267 			/* NB: ieee80211_find_txnode does stat+msg */
268 			ifp->if_oerrors++;
269 			m_freem(mcopy);
270 			continue;
271 		}
272 		/* calculate priority so drivers can find the tx queue */
273 		if (ieee80211_classify(ni, mcopy)) {
274 			IEEE80211_DISCARD_MAC(vap,
275 			    IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS,
276 			    eh->ether_dhost, NULL,
277 			    "%s", "classification failure");
278 			vap->iv_stats.is_tx_classify++;
279 			ifp->if_oerrors++;
280 			m_freem(mcopy);
281 			ieee80211_free_node(ni);
282 			continue;
283 		}
284 
285 		BPF_MTAP(ifp, m);		/* 802.3 tx */
286 
287 		/*
288 		 * Encapsulate the packet in prep for transmission.
289 		 */
290 		mcopy = ieee80211_encap(vap, ni, mcopy);
291 		if (mcopy == NULL) {
292 			/* NB: stat+msg handled in ieee80211_encap */
293 			ieee80211_free_node(ni);
294 			continue;
295 		}
296 		mcopy->m_flags |= M_MCAST;
297 		mcopy->m_pkthdr.rcvif = (void *) ni;
298 
299 		err = parent->if_transmit(parent, mcopy);
300 		if (err) {
301 			/* NB: IFQ_HANDOFF reclaims mbuf */
302 			ifp->if_oerrors++;
303 			ieee80211_free_node(ni);
304 		} else
305 			ifp->if_opackets++;
306 	}
307 }
308 
309 /*
310  * Handle DWDS discovery on receipt of a 4-address frame in
311  * ap mode.  Queue the frame and post an event for someone
312  * to plumb the necessary WDS vap for this station.  Frames
313  * received prior to the vap set running will then be reprocessed
314  * as if they were just received.
315  */
316 void
317 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m)
318 {
319 	struct ieee80211com *ic = ni->ni_ic;
320 
321 	/*
322 	 * Save the frame with an aging interval 4 times
323 	 * the listen interval specified by the station.
324 	 * Frames that sit around too long are reclaimed
325 	 * using this information.
326 	 * XXX handle overflow?
327 	 * XXX per/vap beacon interval?
328 	 */
329 	m->m_pkthdr.rcvif = (void *)(uintptr_t)
330 	    ieee80211_mac_hash(ic, ni->ni_macaddr);
331 	(void) ieee80211_ageq_append(&ic->ic_stageq, m,
332 	    ((ni->ni_intval * ic->ic_lintval) << 2) / 1024);
333 	ieee80211_notify_wds_discover(ni);
334 }
335 
336 /*
337  * IEEE80211_M_WDS vap state machine handler.
338  */
339 static int
340 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
341 {
342 	struct ieee80211com *ic = vap->iv_ic;
343 	struct ieee80211_node *ni;
344 	enum ieee80211_state ostate;
345 	int error;
346 
347 	IEEE80211_LOCK_ASSERT(ic);
348 
349 	ostate = vap->iv_state;
350 	IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__,
351 		ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
352 	vap->iv_state = nstate;			/* state transition */
353 	callout_stop(&vap->iv_mgtsend);		/* XXX callout_drain */
354 	if (ostate != IEEE80211_S_SCAN)
355 		ieee80211_cancel_scan(vap);	/* background scan */
356 	ni = vap->iv_bss;			/* NB: no reference held */
357 	error = 0;
358 	switch (nstate) {
359 	case IEEE80211_S_INIT:
360 		switch (ostate) {
361 		case IEEE80211_S_SCAN:
362 			ieee80211_cancel_scan(vap);
363 			break;
364 		default:
365 			break;
366 		}
367 		if (ostate != IEEE80211_S_INIT) {
368 			/* NB: optimize INIT -> INIT case */
369 			ieee80211_reset_bss(vap);
370 		}
371 		break;
372 	case IEEE80211_S_SCAN:
373 		switch (ostate) {
374 		case IEEE80211_S_INIT:
375 			ieee80211_check_scan_current(vap);
376 			break;
377 		default:
378 			break;
379 		}
380 		break;
381 	case IEEE80211_S_RUN:
382 		if (ostate == IEEE80211_S_INIT) {
383 			/*
384 			 * Already have a channel; bypass the scan
385 			 * and startup immediately.
386 			 */
387 			error = ieee80211_create_wds(vap, ic->ic_curchan);
388 		}
389 		break;
390 	default:
391 		break;
392 	}
393 	return error;
394 }
395 
396 /*
397  * Process a received frame.  The node associated with the sender
398  * should be supplied.  If nothing was found in the node table then
399  * the caller is assumed to supply a reference to iv_bss instead.
400  * The RSSI and a timestamp are also supplied.  The RSSI data is used
401  * during AP scanning to select a AP to associate with; it can have
402  * any units so long as values have consistent units and higher values
403  * mean ``better signal''.  The receive timestamp is currently not used
404  * by the 802.11 layer.
405  */
406 static int
407 wds_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
408 {
409 #define	HAS_SEQ(type)	((type & 0x4) == 0)
410 	struct ieee80211vap *vap = ni->ni_vap;
411 	struct ieee80211com *ic = ni->ni_ic;
412 	struct ifnet *ifp = vap->iv_ifp;
413 	struct ieee80211_frame *wh;
414 	struct ieee80211_key *key;
415 	struct ether_header *eh;
416 	int hdrspace, need_tap = 1;	/* mbuf need to be tapped. */
417 	uint8_t dir, type, subtype, qos;
418 	uint16_t rxseq;
419 
420 	if (m->m_flags & M_AMPDU_MPDU) {
421 		/*
422 		 * Fastpath for A-MPDU reorder q resubmission.  Frames
423 		 * w/ M_AMPDU_MPDU marked have already passed through
424 		 * here but were received out of order and been held on
425 		 * the reorder queue.  When resubmitted they are marked
426 		 * with the M_AMPDU_MPDU flag and we can bypass most of
427 		 * the normal processing.
428 		 */
429 		wh = mtod(m, struct ieee80211_frame *);
430 		type = IEEE80211_FC0_TYPE_DATA;
431 		dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
432 		subtype = IEEE80211_FC0_SUBTYPE_QOS;
433 		hdrspace = ieee80211_hdrspace(ic, wh);	/* XXX optimize? */
434 		goto resubmit_ampdu;
435 	}
436 
437 	KASSERT(ni != NULL, ("null node"));
438 
439 	type = -1;			/* undefined */
440 
441 	if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
442 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
443 		    ni->ni_macaddr, NULL,
444 		    "too short (1): len %u", m->m_pkthdr.len);
445 		vap->iv_stats.is_rx_tooshort++;
446 		goto out;
447 	}
448 	/*
449 	 * Bit of a cheat here, we use a pointer for a 3-address
450 	 * frame format but don't reference fields past outside
451 	 * ieee80211_frame_min w/o first validating the data is
452 	 * present.
453 	 */
454 	wh = mtod(m, struct ieee80211_frame *);
455 
456 	if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
457 		ni->ni_inact = ni->ni_inact_reload;
458 
459 	if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
460 	    IEEE80211_FC0_VERSION_0) {
461 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
462 		    ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
463 		    wh->i_fc[0], wh->i_fc[1]);
464 		vap->iv_stats.is_rx_badversion++;
465 		goto err;
466 	}
467 
468 	dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
469 	type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
470 	subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
471 
472 	/* NB: WDS vap's do not scan */
473 	if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) {
474 		IEEE80211_DISCARD_MAC(vap,
475 		    IEEE80211_MSG_ANY, ni->ni_macaddr, NULL,
476 		    "too short (3): len %u", m->m_pkthdr.len);
477 		vap->iv_stats.is_rx_tooshort++;
478 		goto out;
479 	}
480 	/* NB: the TA is implicitly verified by finding the wds peer node */
481 	if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) &&
482 	    !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) {
483 		/* not interested in */
484 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
485 		    wh->i_addr1, NULL, "%s", "not to bss");
486 		vap->iv_stats.is_rx_wrongbss++;
487 		goto out;
488 	}
489 	IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
490 	ni->ni_noise = nf;
491 	if (HAS_SEQ(type)) {
492 		uint8_t tid = ieee80211_gettid(wh);
493 		if (IEEE80211_QOS_HAS_SEQ(wh) &&
494 		    TID_TO_WME_AC(tid) >= WME_AC_VI)
495 			ic->ic_wme.wme_hipri_traffic++;
496 		rxseq = le16toh(*(uint16_t *)wh->i_seq);
497 		if (! ieee80211_check_rxseq(ni, wh)) {
498 			/* duplicate, discard */
499 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
500 			    wh->i_addr1, "duplicate",
501 			    "seqno <%u,%u> fragno <%u,%u> tid %u",
502 			    rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
503 			    ni->ni_rxseqs[tid] >> IEEE80211_SEQ_SEQ_SHIFT,
504 			    rxseq & IEEE80211_SEQ_FRAG_MASK,
505 			    ni->ni_rxseqs[tid] & IEEE80211_SEQ_FRAG_MASK,
506 			    tid);
507 			vap->iv_stats.is_rx_dup++;
508 			IEEE80211_NODE_STAT(ni, rx_dup);
509 			goto out;
510 		}
511 		ni->ni_rxseqs[tid] = rxseq;
512 	}
513 	switch (type) {
514 	case IEEE80211_FC0_TYPE_DATA:
515 		hdrspace = ieee80211_hdrspace(ic, wh);
516 		if (m->m_len < hdrspace &&
517 		    (m = m_pullup(m, hdrspace)) == NULL) {
518 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
519 			    ni->ni_macaddr, NULL,
520 			    "data too short: expecting %u", hdrspace);
521 			vap->iv_stats.is_rx_tooshort++;
522 			goto out;		/* XXX */
523 		}
524 		if (dir != IEEE80211_FC1_DIR_DSTODS) {
525 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
526 			    wh, "data", "incorrect dir 0x%x", dir);
527 			vap->iv_stats.is_rx_wrongdir++;
528 			goto out;
529 		}
530 		/*
531 		 * Only legacy WDS traffic should take this path.
532 		 */
533 		if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
534 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
535 			    wh, "data", "%s", "not legacy wds");
536 			vap->iv_stats.is_rx_wrongdir++;/*XXX*/
537 			goto out;
538 		}
539 		/*
540 		 * Handle A-MPDU re-ordering.  If the frame is to be
541 		 * processed directly then ieee80211_ampdu_reorder
542 		 * will return 0; otherwise it has consumed the mbuf
543 		 * and we should do nothing more with it.
544 		 */
545 		if ((m->m_flags & M_AMPDU) &&
546 		    ieee80211_ampdu_reorder(ni, m) != 0) {
547 			m = NULL;
548 			goto out;
549 		}
550 	resubmit_ampdu:
551 
552 		/*
553 		 * Handle privacy requirements.  Note that we
554 		 * must not be preempted from here until after
555 		 * we (potentially) call ieee80211_crypto_demic;
556 		 * otherwise we may violate assumptions in the
557 		 * crypto cipher modules used to do delayed update
558 		 * of replay sequence numbers.
559 		 */
560 		if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
561 			if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
562 				/*
563 				 * Discard encrypted frames when privacy is off.
564 				 */
565 				IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
566 				    wh, "WEP", "%s", "PRIVACY off");
567 				vap->iv_stats.is_rx_noprivacy++;
568 				IEEE80211_NODE_STAT(ni, rx_noprivacy);
569 				goto out;
570 			}
571 			key = ieee80211_crypto_decap(ni, m, hdrspace);
572 			if (key == NULL) {
573 				/* NB: stats+msgs handled in crypto_decap */
574 				IEEE80211_NODE_STAT(ni, rx_wepfail);
575 				goto out;
576 			}
577 			wh = mtod(m, struct ieee80211_frame *);
578 			wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
579 		} else {
580 			/* XXX M_WEP and IEEE80211_F_PRIVACY */
581 			key = NULL;
582 		}
583 
584 		/*
585 		 * Save QoS bits for use below--before we strip the header.
586 		 */
587 		if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
588 			qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
589 			    ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
590 			    ((struct ieee80211_qosframe *)wh)->i_qos[0];
591 		} else
592 			qos = 0;
593 
594 		/*
595 		 * Next up, any fragmentation.
596 		 */
597 		if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
598 			m = ieee80211_defrag(ni, m, hdrspace);
599 			if (m == NULL) {
600 				/* Fragment dropped or frame not complete yet */
601 				goto out;
602 			}
603 		}
604 		wh = NULL;		/* no longer valid, catch any uses */
605 
606 		/*
607 		 * Next strip any MSDU crypto bits.
608 		 */
609 		if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
610 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
611 			    ni->ni_macaddr, "data", "%s", "demic error");
612 			vap->iv_stats.is_rx_demicfail++;
613 			IEEE80211_NODE_STAT(ni, rx_demicfail);
614 			goto out;
615 		}
616 
617 		/* copy to listener after decrypt */
618 		if (ieee80211_radiotap_active_vap(vap))
619 			ieee80211_radiotap_rx(vap, m);
620 		need_tap = 0;
621 
622 		/*
623 		 * Finally, strip the 802.11 header.
624 		 */
625 		m = ieee80211_decap(vap, m, hdrspace);
626 		if (m == NULL) {
627 			/* XXX mask bit to check for both */
628 			/* don't count Null data frames as errors */
629 			if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
630 			    subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
631 				goto out;
632 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
633 			    ni->ni_macaddr, "data", "%s", "decap error");
634 			vap->iv_stats.is_rx_decap++;
635 			IEEE80211_NODE_STAT(ni, rx_decap);
636 			goto err;
637 		}
638 		eh = mtod(m, struct ether_header *);
639 		if (!ieee80211_node_is_authorized(ni)) {
640 			/*
641 			 * Deny any non-PAE frames received prior to
642 			 * authorization.  For open/shared-key
643 			 * authentication the port is mark authorized
644 			 * after authentication completes.  For 802.1x
645 			 * the port is not marked authorized by the
646 			 * authenticator until the handshake has completed.
647 			 */
648 			if (eh->ether_type != htons(ETHERTYPE_PAE)) {
649 				IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
650 				    eh->ether_shost, "data",
651 				    "unauthorized port: ether type 0x%x len %u",
652 				    eh->ether_type, m->m_pkthdr.len);
653 				vap->iv_stats.is_rx_unauth++;
654 				IEEE80211_NODE_STAT(ni, rx_unauth);
655 				goto err;
656 			}
657 		} else {
658 			/*
659 			 * When denying unencrypted frames, discard
660 			 * any non-PAE frames received without encryption.
661 			 */
662 			if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
663 			    (key == NULL && (m->m_flags & M_WEP) == 0) &&
664 			    eh->ether_type != htons(ETHERTYPE_PAE)) {
665 				/*
666 				 * Drop unencrypted frames.
667 				 */
668 				vap->iv_stats.is_rx_unencrypted++;
669 				IEEE80211_NODE_STAT(ni, rx_unencrypted);
670 				goto out;
671 			}
672 		}
673 		/* XXX require HT? */
674 		if (qos & IEEE80211_QOS_AMSDU) {
675 			m = ieee80211_decap_amsdu(ni, m);
676 			if (m == NULL)
677 				return IEEE80211_FC0_TYPE_DATA;
678 		} else {
679 #ifdef IEEE80211_SUPPORT_SUPERG
680 			m = ieee80211_decap_fastframe(vap, ni, m);
681 			if (m == NULL)
682 				return IEEE80211_FC0_TYPE_DATA;
683 #endif
684 		}
685 		ieee80211_deliver_data(vap, ni, m);
686 		return IEEE80211_FC0_TYPE_DATA;
687 
688 	case IEEE80211_FC0_TYPE_MGT:
689 		vap->iv_stats.is_rx_mgmt++;
690 		IEEE80211_NODE_STAT(ni, rx_mgmt);
691 		if (dir != IEEE80211_FC1_DIR_NODS) {
692 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
693 			    wh, "data", "incorrect dir 0x%x", dir);
694 			vap->iv_stats.is_rx_wrongdir++;
695 			goto err;
696 		}
697 		if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
698 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
699 			    ni->ni_macaddr, "mgt", "too short: len %u",
700 			    m->m_pkthdr.len);
701 			vap->iv_stats.is_rx_tooshort++;
702 			goto out;
703 		}
704 #ifdef IEEE80211_DEBUG
705 		if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) {
706 			if_printf(ifp, "received %s from %s rssi %d\n",
707 			    ieee80211_mgt_subtype_name[subtype >>
708 				IEEE80211_FC0_SUBTYPE_SHIFT],
709 			    ether_sprintf(wh->i_addr2), rssi);
710 		}
711 #endif
712 		if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
713 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
714 			    wh, NULL, "%s", "WEP set but not permitted");
715 			vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
716 			goto out;
717 		}
718 		vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
719 		goto out;
720 
721 	case IEEE80211_FC0_TYPE_CTL:
722 		vap->iv_stats.is_rx_ctl++;
723 		IEEE80211_NODE_STAT(ni, rx_ctrl);
724 		goto out;
725 
726 	default:
727 		IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
728 		    wh, "bad", "frame type 0x%x", type);
729 		/* should not come here */
730 		break;
731 	}
732 err:
733 	ifp->if_ierrors++;
734 out:
735 	if (m != NULL) {
736 		if (need_tap && ieee80211_radiotap_active_vap(vap))
737 			ieee80211_radiotap_rx(vap, m);
738 		m_freem(m);
739 	}
740 	return type;
741 }
742 
743 static void
744 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
745 	int subtype, int rssi, int nf)
746 {
747 	struct ieee80211vap *vap = ni->ni_vap;
748 	struct ieee80211com *ic = ni->ni_ic;
749 	struct ieee80211_frame *wh;
750 	u_int8_t *frm, *efrm;
751 
752 	wh = mtod(m0, struct ieee80211_frame *);
753 	frm = (u_int8_t *)&wh[1];
754 	efrm = mtod(m0, u_int8_t *) + m0->m_len;
755 	switch (subtype) {
756 	case IEEE80211_FC0_SUBTYPE_ACTION:
757 	case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
758 		if (ni == vap->iv_bss) {
759 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
760 			    wh, NULL, "%s", "unknown node");
761 			vap->iv_stats.is_rx_mgtdiscard++;
762 		} else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) {
763 			/* NB: not interested in multicast frames. */
764 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
765 			    wh, NULL, "%s", "not for us");
766 			vap->iv_stats.is_rx_mgtdiscard++;
767 		} else if (vap->iv_state != IEEE80211_S_RUN) {
768 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
769 			    wh, NULL, "wrong state %s",
770 			    ieee80211_state_name[vap->iv_state]);
771 			vap->iv_stats.is_rx_mgtdiscard++;
772 		} else {
773 			if (ieee80211_parse_action(ni, m0) == 0)
774 				(void)ic->ic_recv_action(ni, wh, frm, efrm);
775 		}
776 		break;
777 
778 	case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
779 	case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
780 	case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
781 	case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
782 	case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
783 	case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
784 	case IEEE80211_FC0_SUBTYPE_BEACON:
785 	case IEEE80211_FC0_SUBTYPE_ATIM:
786 	case IEEE80211_FC0_SUBTYPE_DISASSOC:
787 	case IEEE80211_FC0_SUBTYPE_AUTH:
788 	case IEEE80211_FC0_SUBTYPE_DEAUTH:
789 		IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
790 		    wh, NULL, "%s", "not handled");
791 		vap->iv_stats.is_rx_mgtdiscard++;
792 		break;
793 
794 	default:
795 		IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
796 		    wh, "mgt", "subtype 0x%x not handled", subtype);
797 		vap->iv_stats.is_rx_badsubtype++;
798 		break;
799 	}
800 }
801