xref: /freebsd/sys/net80211/ieee80211_wds.c (revision 907b59d76938e654f0d040a888e8dfca3de1e222)
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_var.h>
52 #include <net/if_media.h>
53 #include <net/if_llc.h>
54 #include <net/ethernet.h>
55 
56 #include <net/bpf.h>
57 
58 #include <net80211/ieee80211_var.h>
59 #include <net80211/ieee80211_wds.h>
60 #include <net80211/ieee80211_input.h>
61 #ifdef IEEE80211_SUPPORT_SUPERG
62 #include <net80211/ieee80211_superg.h>
63 #endif
64 
65 static void wds_vattach(struct ieee80211vap *);
66 static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int);
67 static	int wds_input(struct ieee80211_node *ni, struct mbuf *m,
68 	    const struct ieee80211_rx_stats *rxs, int, int);
69 static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, int subtype,
70 	const struct ieee80211_rx_stats *, int, int);
71 
72 void
73 ieee80211_wds_attach(struct ieee80211com *ic)
74 {
75 	ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach;
76 }
77 
78 void
79 ieee80211_wds_detach(struct ieee80211com *ic)
80 {
81 }
82 
83 static void
84 wds_vdetach(struct ieee80211vap *vap)
85 {
86 	if (vap->iv_bss != NULL) {
87 		/* XXX locking? */
88 		if (vap->iv_bss->ni_wdsvap == vap)
89 			vap->iv_bss->ni_wdsvap = NULL;
90 	}
91 }
92 
93 static void
94 wds_vattach(struct ieee80211vap *vap)
95 {
96 	vap->iv_newstate = wds_newstate;
97 	vap->iv_input = wds_input;
98 	vap->iv_recv_mgmt = wds_recv_mgmt;
99 	vap->iv_opdetach = wds_vdetach;
100 }
101 
102 static void
103 wds_flush(struct ieee80211_node *ni)
104 {
105 	struct ieee80211com *ic = ni->ni_ic;
106 	struct mbuf *m, *next;
107 	int8_t rssi, nf;
108 
109 	m = ieee80211_ageq_remove(&ic->ic_stageq,
110 	    (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr));
111 	if (m == NULL)
112 		return;
113 
114 	IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni,
115 	    "%s", "flush wds queue");
116 	ic->ic_node_getsignal(ni, &rssi, &nf);
117 	for (; m != NULL; m = next) {
118 		next = m->m_nextpkt;
119 		m->m_nextpkt = NULL;
120 		ieee80211_input(ni, m, rssi, nf);
121 	}
122 }
123 
124 static int
125 ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan)
126 {
127 	struct ieee80211com *ic = vap->iv_ic;
128 	struct ieee80211_node_table *nt = &ic->ic_sta;
129 	struct ieee80211_node *ni, *obss;
130 
131 	IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
132 	     "%s: creating link to %s on channel %u\n", __func__,
133 	     ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan));
134 
135 	/* NB: vap create must specify the bssid for the link */
136 	KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid"));
137 	/* NB: we should only be called on RUN transition */
138 	KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state"));
139 
140 	if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
141 		/*
142 		 * Dynamic/non-legacy WDS.  Reference the associated
143 		 * station specified by the desired bssid setup at vap
144 		 * create.  Point ni_wdsvap at the WDS vap so 4-address
145 		 * frames received through the associated AP vap will
146 		 * be dispatched upward (e.g. to a bridge) as though
147 		 * they arrived on the WDS vap.
148 		 */
149 		IEEE80211_NODE_LOCK(nt);
150 		obss = NULL;
151 		ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid);
152 		if (ni == NULL) {
153 			/*
154 			 * Node went away before we could hookup.  This
155 			 * should be ok; no traffic will flow and a leave
156 			 * event will be dispatched that should cause
157 			 * the vap to be destroyed.
158 			 */
159 			IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
160 			    "%s: station %s went away\n",
161 			    __func__, ether_sprintf(vap->iv_des_bssid));
162 			/* XXX stat? */
163 		} else if (ni->ni_wdsvap != NULL) {
164 			/*
165 			 * Node already setup with a WDS vap; we cannot
166 			 * allow multiple references so disallow.  If
167 			 * ni_wdsvap points at us that's ok; we should
168 			 * do nothing anyway.
169 			 */
170 			/* XXX printf instead? */
171 			IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
172 			    "%s: station %s in use with %s\n",
173 			    __func__, ether_sprintf(vap->iv_des_bssid),
174 			    ni->ni_wdsvap->iv_ifp->if_xname);
175 			/* XXX stat? */
176 		} else {
177 			/*
178 			 * Committed to new node, setup state.
179 			 */
180 			obss = vap->iv_bss;
181 			vap->iv_bss = ni;
182 			ni->ni_wdsvap = vap;
183 		}
184 		IEEE80211_NODE_UNLOCK(nt);
185 		if (obss != NULL) {
186 			/* NB: deferred to avoid recursive lock */
187 			ieee80211_free_node(obss);
188 		}
189 	} else {
190 		/*
191 		 * Legacy WDS vap setup.
192 		 */
193 		/*
194 		 * The far end does not associate so we just create
195 		 * create a new node and install it as the vap's
196 		 * bss node.  We must simulate an association and
197 		 * authorize the port for traffic to flow.
198 		 * XXX check if node already in sta table?
199 		 */
200 		ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan);
201 		if (ni != NULL) {
202 			obss = vap->iv_bss;
203 			vap->iv_bss = ieee80211_ref_node(ni);
204 			ni->ni_flags |= IEEE80211_NODE_AREF;
205 			if (obss != NULL)
206 				ieee80211_free_node(obss);
207 			/* give driver a chance to setup state like ni_txrate */
208 			if (ic->ic_newassoc != NULL)
209 				ic->ic_newassoc(ni, 1);
210 			/* tell the authenticator about new station */
211 			if (vap->iv_auth->ia_node_join != NULL)
212 				vap->iv_auth->ia_node_join(ni);
213 			if (ni->ni_authmode != IEEE80211_AUTH_8021X)
214 				ieee80211_node_authorize(ni);
215 
216 			ieee80211_notify_node_join(ni, 1 /*newassoc*/);
217 			/* XXX inject l2uf frame */
218 		}
219 	}
220 
221 	/*
222 	 * Flush any pending frames now that were setup.
223 	 */
224 	if (ni != NULL)
225 		wds_flush(ni);
226 	return (ni == NULL ? ENOENT : 0);
227 }
228 
229 /*
230  * Propagate multicast frames of an ap vap to all DWDS links.
231  * The caller is assumed to have verified this frame is multicast.
232  */
233 void
234 ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m)
235 {
236 	struct ieee80211com *ic = vap0->iv_ic;
237 	const struct ether_header *eh = mtod(m, const struct ether_header *);
238 	struct ieee80211_node *ni;
239 	struct ieee80211vap *vap;
240 	struct ifnet *ifp;
241 	struct mbuf *mcopy;
242 	int err;
243 
244 	KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost),
245 	    ("%s not mcast", ether_sprintf(eh->ether_dhost)));
246 
247 	/* XXX locking */
248 	TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
249 		/* only DWDS vaps are interesting */
250 		if (vap->iv_opmode != IEEE80211_M_WDS ||
251 		    (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))
252 			continue;
253 		/* if it came in this interface, don't send it back out */
254 		ifp = vap->iv_ifp;
255 		if (ifp == m->m_pkthdr.rcvif)
256 			continue;
257 		/*
258 		 * Duplicate the frame and send it.
259 		 */
260 		mcopy = m_copypacket(m, M_NOWAIT);
261 		if (mcopy == NULL) {
262 			if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
263 			/* XXX stat + msg */
264 			continue;
265 		}
266 		ni = ieee80211_find_txnode(vap, eh->ether_dhost);
267 		if (ni == NULL) {
268 			/* NB: ieee80211_find_txnode does stat+msg */
269 			if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
270 			m_freem(mcopy);
271 			continue;
272 		}
273 		/* calculate priority so drivers can find the tx queue */
274 		if (ieee80211_classify(ni, mcopy)) {
275 			IEEE80211_DISCARD_MAC(vap,
276 			    IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS,
277 			    eh->ether_dhost, NULL,
278 			    "%s", "classification failure");
279 			vap->iv_stats.is_tx_classify++;
280 			if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
281 			m_freem(mcopy);
282 			ieee80211_free_node(ni);
283 			continue;
284 		}
285 
286 		BPF_MTAP(ifp, m);		/* 802.3 tx */
287 
288 		/*
289 		 * Encapsulate the packet in prep for transmission.
290 		 */
291 		IEEE80211_TX_LOCK(ic);
292 		mcopy = ieee80211_encap(vap, ni, mcopy);
293 		if (mcopy == NULL) {
294 			/* NB: stat+msg handled in ieee80211_encap */
295 			IEEE80211_TX_UNLOCK(ic);
296 			ieee80211_free_node(ni);
297 			continue;
298 		}
299 		mcopy->m_flags |= M_MCAST;
300 		mcopy->m_pkthdr.rcvif = (void *) ni;
301 
302 		err = ieee80211_parent_xmitpkt(ic, mcopy);
303 		IEEE80211_TX_UNLOCK(ic);
304 		if (!err) {
305 			if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
306 			if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
307 			if_inc_counter(ifp, IFCOUNTER_OBYTES,
308 			    m->m_pkthdr.len);
309 		}
310 	}
311 }
312 
313 /*
314  * Handle DWDS discovery on receipt of a 4-address frame in
315  * ap mode.  Queue the frame and post an event for someone
316  * to plumb the necessary WDS vap for this station.  Frames
317  * received prior to the vap set running will then be reprocessed
318  * as if they were just received.
319  */
320 void
321 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m)
322 {
323 	struct ieee80211com *ic = ni->ni_ic;
324 
325 	/*
326 	 * Save the frame with an aging interval 4 times
327 	 * the listen interval specified by the station.
328 	 * Frames that sit around too long are reclaimed
329 	 * using this information.
330 	 * XXX handle overflow?
331 	 * XXX per/vap beacon interval?
332 	 */
333 	m->m_pkthdr.rcvif = (void *)(uintptr_t)
334 	    ieee80211_mac_hash(ic, ni->ni_macaddr);
335 	(void) ieee80211_ageq_append(&ic->ic_stageq, m,
336 	    ((ni->ni_intval * ic->ic_lintval) << 2) / 1024);
337 	ieee80211_notify_wds_discover(ni);
338 }
339 
340 /*
341  * IEEE80211_M_WDS vap state machine handler.
342  */
343 static int
344 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
345 {
346 	struct ieee80211com *ic = vap->iv_ic;
347 	enum ieee80211_state ostate;
348 	int error;
349 
350 	IEEE80211_LOCK_ASSERT(ic);
351 
352 	ostate = vap->iv_state;
353 	IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__,
354 		ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
355 	vap->iv_state = nstate;			/* state transition */
356 	callout_stop(&vap->iv_mgtsend);		/* XXX callout_drain */
357 	if (ostate != IEEE80211_S_SCAN)
358 		ieee80211_cancel_scan(vap);	/* background scan */
359 	error = 0;
360 	switch (nstate) {
361 	case IEEE80211_S_INIT:
362 		switch (ostate) {
363 		case IEEE80211_S_SCAN:
364 			ieee80211_cancel_scan(vap);
365 			break;
366 		default:
367 			break;
368 		}
369 		if (ostate != IEEE80211_S_INIT) {
370 			/* NB: optimize INIT -> INIT case */
371 			ieee80211_reset_bss(vap);
372 		}
373 		break;
374 	case IEEE80211_S_SCAN:
375 		switch (ostate) {
376 		case IEEE80211_S_INIT:
377 			ieee80211_check_scan_current(vap);
378 			break;
379 		default:
380 			break;
381 		}
382 		break;
383 	case IEEE80211_S_RUN:
384 		if (ostate == IEEE80211_S_INIT) {
385 			/*
386 			 * Already have a channel; bypass the scan
387 			 * and startup immediately.
388 			 */
389 			error = ieee80211_create_wds(vap, ic->ic_curchan);
390 		}
391 		break;
392 	default:
393 		break;
394 	}
395 	return error;
396 }
397 
398 /*
399  * Process a received frame.  The node associated with the sender
400  * should be supplied.  If nothing was found in the node table then
401  * the caller is assumed to supply a reference to iv_bss instead.
402  * The RSSI and a timestamp are also supplied.  The RSSI data is used
403  * during AP scanning to select a AP to associate with; it can have
404  * any units so long as values have consistent units and higher values
405  * mean ``better signal''.  The receive timestamp is currently not used
406  * by the 802.11 layer.
407  */
408 static int
409 wds_input(struct ieee80211_node *ni, struct mbuf *m,
410     const struct ieee80211_rx_stats *rxs, int rssi, int nf)
411 {
412 	struct ieee80211vap *vap = ni->ni_vap;
413 	struct ieee80211com *ic = ni->ni_ic;
414 	struct ifnet *ifp = vap->iv_ifp;
415 	struct ieee80211_frame *wh;
416 	struct ieee80211_key *key;
417 	struct ether_header *eh;
418 	int hdrspace, need_tap = 1;	/* mbuf need to be tapped. */
419 	uint8_t dir, type, subtype, qos;
420 
421 	if (m->m_flags & M_AMPDU_MPDU) {
422 		/*
423 		 * Fastpath for A-MPDU reorder q resubmission.  Frames
424 		 * w/ M_AMPDU_MPDU marked have already passed through
425 		 * here but were received out of order and been held on
426 		 * the reorder queue.  When resubmitted they are marked
427 		 * with the M_AMPDU_MPDU flag and we can bypass most of
428 		 * the normal processing.
429 		 */
430 		wh = mtod(m, struct ieee80211_frame *);
431 		type = IEEE80211_FC0_TYPE_DATA;
432 		dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
433 		subtype = IEEE80211_FC0_SUBTYPE_QOS;
434 		hdrspace = ieee80211_hdrspace(ic, wh);	/* XXX optimize? */
435 		goto resubmit_ampdu;
436 	}
437 
438 	KASSERT(ni != NULL, ("null node"));
439 
440 	type = -1;			/* undefined */
441 
442 	if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
443 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
444 		    ni->ni_macaddr, NULL,
445 		    "too short (1): len %u", m->m_pkthdr.len);
446 		vap->iv_stats.is_rx_tooshort++;
447 		goto out;
448 	}
449 	/*
450 	 * Bit of a cheat here, we use a pointer for a 3-address
451 	 * frame format but don't reference fields past outside
452 	 * ieee80211_frame_min w/o first validating the data is
453 	 * present.
454 	 */
455 	wh = mtod(m, struct ieee80211_frame *);
456 
457 	if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
458 		ni->ni_inact = ni->ni_inact_reload;
459 
460 	if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
461 	    IEEE80211_FC0_VERSION_0) {
462 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
463 		    ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
464 		    wh->i_fc[0], wh->i_fc[1]);
465 		vap->iv_stats.is_rx_badversion++;
466 		goto err;
467 	}
468 
469 	dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
470 	type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
471 	subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
472 
473 	/* NB: WDS vap's do not scan */
474 	if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) {
475 		IEEE80211_DISCARD_MAC(vap,
476 		    IEEE80211_MSG_ANY, ni->ni_macaddr, NULL,
477 		    "too short (3): len %u", m->m_pkthdr.len);
478 		vap->iv_stats.is_rx_tooshort++;
479 		goto out;
480 	}
481 	/* NB: the TA is implicitly verified by finding the wds peer node */
482 	if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) &&
483 	    !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) {
484 		/* not interested in */
485 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
486 		    wh->i_addr1, NULL, "%s", "not to bss");
487 		vap->iv_stats.is_rx_wrongbss++;
488 		goto out;
489 	}
490 	IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
491 	ni->ni_noise = nf;
492 	if (IEEE80211_HAS_SEQ(type, subtype)) {
493 		uint8_t tid = ieee80211_gettid(wh);
494 		if (IEEE80211_QOS_HAS_SEQ(wh) &&
495 		    TID_TO_WME_AC(tid) >= WME_AC_VI)
496 			ic->ic_wme.wme_hipri_traffic++;
497 		if (! ieee80211_check_rxseq(ni, wh, wh->i_addr1))
498 			goto out;
499 	}
500 	switch (type) {
501 	case IEEE80211_FC0_TYPE_DATA:
502 		hdrspace = ieee80211_hdrspace(ic, wh);
503 		if (m->m_len < hdrspace &&
504 		    (m = m_pullup(m, hdrspace)) == NULL) {
505 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
506 			    ni->ni_macaddr, NULL,
507 			    "data too short: expecting %u", hdrspace);
508 			vap->iv_stats.is_rx_tooshort++;
509 			goto out;		/* XXX */
510 		}
511 		if (dir != IEEE80211_FC1_DIR_DSTODS) {
512 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
513 			    wh, "data", "incorrect dir 0x%x", dir);
514 			vap->iv_stats.is_rx_wrongdir++;
515 			goto out;
516 		}
517 		/*
518 		 * Only legacy WDS traffic should take this path.
519 		 */
520 		if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
521 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
522 			    wh, "data", "%s", "not legacy wds");
523 			vap->iv_stats.is_rx_wrongdir++;/*XXX*/
524 			goto out;
525 		}
526 		/*
527 		 * Handle A-MPDU re-ordering.  If the frame is to be
528 		 * processed directly then ieee80211_ampdu_reorder
529 		 * will return 0; otherwise it has consumed the mbuf
530 		 * and we should do nothing more with it.
531 		 */
532 		if ((m->m_flags & M_AMPDU) &&
533 		    ieee80211_ampdu_reorder(ni, m) != 0) {
534 			m = NULL;
535 			goto out;
536 		}
537 	resubmit_ampdu:
538 
539 		/*
540 		 * Handle privacy requirements.  Note that we
541 		 * must not be preempted from here until after
542 		 * we (potentially) call ieee80211_crypto_demic;
543 		 * otherwise we may violate assumptions in the
544 		 * crypto cipher modules used to do delayed update
545 		 * of replay sequence numbers.
546 		 */
547 		if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
548 			if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
549 				/*
550 				 * Discard encrypted frames when privacy is off.
551 				 */
552 				IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
553 				    wh, "WEP", "%s", "PRIVACY off");
554 				vap->iv_stats.is_rx_noprivacy++;
555 				IEEE80211_NODE_STAT(ni, rx_noprivacy);
556 				goto out;
557 			}
558 			key = ieee80211_crypto_decap(ni, m, hdrspace);
559 			if (key == NULL) {
560 				/* NB: stats+msgs handled in crypto_decap */
561 				IEEE80211_NODE_STAT(ni, rx_wepfail);
562 				goto out;
563 			}
564 			wh = mtod(m, struct ieee80211_frame *);
565 			wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
566 		} else {
567 			/* XXX M_WEP and IEEE80211_F_PRIVACY */
568 			key = NULL;
569 		}
570 
571 		/*
572 		 * Save QoS bits for use below--before we strip the header.
573 		 */
574 		if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
575 			qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
576 			    ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
577 			    ((struct ieee80211_qosframe *)wh)->i_qos[0];
578 		} else
579 			qos = 0;
580 
581 		/*
582 		 * Next up, any fragmentation.
583 		 */
584 		if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
585 			m = ieee80211_defrag(ni, m, hdrspace);
586 			if (m == NULL) {
587 				/* Fragment dropped or frame not complete yet */
588 				goto out;
589 			}
590 		}
591 		wh = NULL;		/* no longer valid, catch any uses */
592 
593 		/*
594 		 * Next strip any MSDU crypto bits.
595 		 */
596 		if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
597 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
598 			    ni->ni_macaddr, "data", "%s", "demic error");
599 			vap->iv_stats.is_rx_demicfail++;
600 			IEEE80211_NODE_STAT(ni, rx_demicfail);
601 			goto out;
602 		}
603 
604 		/* copy to listener after decrypt */
605 		if (ieee80211_radiotap_active_vap(vap))
606 			ieee80211_radiotap_rx(vap, m);
607 		need_tap = 0;
608 
609 		/*
610 		 * Finally, strip the 802.11 header.
611 		 */
612 		m = ieee80211_decap(vap, m, hdrspace);
613 		if (m == NULL) {
614 			/* XXX mask bit to check for both */
615 			/* don't count Null data frames as errors */
616 			if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
617 			    subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
618 				goto out;
619 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
620 			    ni->ni_macaddr, "data", "%s", "decap error");
621 			vap->iv_stats.is_rx_decap++;
622 			IEEE80211_NODE_STAT(ni, rx_decap);
623 			goto err;
624 		}
625 		eh = mtod(m, struct ether_header *);
626 		if (!ieee80211_node_is_authorized(ni)) {
627 			/*
628 			 * Deny any non-PAE frames received prior to
629 			 * authorization.  For open/shared-key
630 			 * authentication the port is mark authorized
631 			 * after authentication completes.  For 802.1x
632 			 * the port is not marked authorized by the
633 			 * authenticator until the handshake has completed.
634 			 */
635 			if (eh->ether_type != htons(ETHERTYPE_PAE)) {
636 				IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
637 				    eh->ether_shost, "data",
638 				    "unauthorized port: ether type 0x%x len %u",
639 				    eh->ether_type, m->m_pkthdr.len);
640 				vap->iv_stats.is_rx_unauth++;
641 				IEEE80211_NODE_STAT(ni, rx_unauth);
642 				goto err;
643 			}
644 		} else {
645 			/*
646 			 * When denying unencrypted frames, discard
647 			 * any non-PAE frames received without encryption.
648 			 */
649 			if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
650 			    (key == NULL && (m->m_flags & M_WEP) == 0) &&
651 			    eh->ether_type != htons(ETHERTYPE_PAE)) {
652 				/*
653 				 * Drop unencrypted frames.
654 				 */
655 				vap->iv_stats.is_rx_unencrypted++;
656 				IEEE80211_NODE_STAT(ni, rx_unencrypted);
657 				goto out;
658 			}
659 		}
660 		/* XXX require HT? */
661 		if (qos & IEEE80211_QOS_AMSDU) {
662 			m = ieee80211_decap_amsdu(ni, m);
663 			if (m == NULL)
664 				return IEEE80211_FC0_TYPE_DATA;
665 		} else {
666 #ifdef IEEE80211_SUPPORT_SUPERG
667 			m = ieee80211_decap_fastframe(vap, ni, m);
668 			if (m == NULL)
669 				return IEEE80211_FC0_TYPE_DATA;
670 #endif
671 		}
672 		ieee80211_deliver_data(vap, ni, m);
673 		return IEEE80211_FC0_TYPE_DATA;
674 
675 	case IEEE80211_FC0_TYPE_MGT:
676 		vap->iv_stats.is_rx_mgmt++;
677 		IEEE80211_NODE_STAT(ni, rx_mgmt);
678 		if (dir != IEEE80211_FC1_DIR_NODS) {
679 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
680 			    wh, "data", "incorrect dir 0x%x", dir);
681 			vap->iv_stats.is_rx_wrongdir++;
682 			goto err;
683 		}
684 		if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
685 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
686 			    ni->ni_macaddr, "mgt", "too short: len %u",
687 			    m->m_pkthdr.len);
688 			vap->iv_stats.is_rx_tooshort++;
689 			goto out;
690 		}
691 #ifdef IEEE80211_DEBUG
692 		if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) {
693 			if_printf(ifp, "received %s from %s rssi %d\n",
694 			    ieee80211_mgt_subtype_name(subtype),
695 			    ether_sprintf(wh->i_addr2), rssi);
696 		}
697 #endif
698 		if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
699 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
700 			    wh, NULL, "%s", "WEP set but not permitted");
701 			vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
702 			goto out;
703 		}
704 		vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
705 		goto out;
706 
707 	case IEEE80211_FC0_TYPE_CTL:
708 		vap->iv_stats.is_rx_ctl++;
709 		IEEE80211_NODE_STAT(ni, rx_ctrl);
710 		goto out;
711 
712 	default:
713 		IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
714 		    wh, "bad", "frame type 0x%x", type);
715 		/* should not come here */
716 		break;
717 	}
718 err:
719 	if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
720 out:
721 	if (m != NULL) {
722 		if (need_tap && ieee80211_radiotap_active_vap(vap))
723 			ieee80211_radiotap_rx(vap, m);
724 		m_freem(m);
725 	}
726 	return type;
727 }
728 
729 static void
730 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
731     const struct ieee80211_rx_stats *rxs, int rssi, int nf)
732 {
733 	struct ieee80211vap *vap = ni->ni_vap;
734 	struct ieee80211com *ic = ni->ni_ic;
735 	struct ieee80211_frame *wh;
736 	u_int8_t *frm, *efrm;
737 
738 	wh = mtod(m0, struct ieee80211_frame *);
739 	frm = (u_int8_t *)&wh[1];
740 	efrm = mtod(m0, u_int8_t *) + m0->m_len;
741 	switch (subtype) {
742 	case IEEE80211_FC0_SUBTYPE_ACTION:
743 	case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
744 		if (ni == vap->iv_bss) {
745 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
746 			    wh, NULL, "%s", "unknown node");
747 			vap->iv_stats.is_rx_mgtdiscard++;
748 		} else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) {
749 			/* NB: not interested in multicast frames. */
750 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
751 			    wh, NULL, "%s", "not for us");
752 			vap->iv_stats.is_rx_mgtdiscard++;
753 		} else if (vap->iv_state != IEEE80211_S_RUN) {
754 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
755 			    wh, NULL, "wrong state %s",
756 			    ieee80211_state_name[vap->iv_state]);
757 			vap->iv_stats.is_rx_mgtdiscard++;
758 		} else {
759 			if (ieee80211_parse_action(ni, m0) == 0)
760 				(void)ic->ic_recv_action(ni, wh, frm, efrm);
761 		}
762 		break;
763 
764 	case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
765 	case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
766 	case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
767 	case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
768 	case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
769 	case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
770 	case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
771 	case IEEE80211_FC0_SUBTYPE_BEACON:
772 	case IEEE80211_FC0_SUBTYPE_ATIM:
773 	case IEEE80211_FC0_SUBTYPE_DISASSOC:
774 	case IEEE80211_FC0_SUBTYPE_AUTH:
775 	case IEEE80211_FC0_SUBTYPE_DEAUTH:
776 		IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
777 		    wh, NULL, "%s", "not handled");
778 		vap->iv_stats.is_rx_mgtdiscard++;
779 		break;
780 
781 	default:
782 		IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
783 		    wh, "mgt", "subtype 0x%x not handled", subtype);
784 		vap->iv_stats.is_rx_badsubtype++;
785 		break;
786 	}
787 }
788