xref: /freebsd/sys/net80211/ieee80211_input.c (revision 792bbaba989533a1fc93823df1720c8c4aaf0442)
1 /*-
2  * Copyright (c) 2001 Atsushi Onoe
3  * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  */
26 
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29 
30 #include "opt_wlan.h"
31 
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/mbuf.h>
35 #include <sys/malloc.h>
36 #include <sys/endian.h>
37 #include <sys/kernel.h>
38 
39 #include <sys/socket.h>
40 
41 #include <net/ethernet.h>
42 #include <net/if.h>
43 #include <net/if_var.h>
44 #include <net/if_llc.h>
45 #include <net/if_media.h>
46 #include <net/if_vlan_var.h>
47 
48 #include <net80211/ieee80211_var.h>
49 #include <net80211/ieee80211_input.h>
50 #ifdef IEEE80211_SUPPORT_MESH
51 #include <net80211/ieee80211_mesh.h>
52 #endif
53 
54 #include <net/bpf.h>
55 
56 #ifdef INET
57 #include <netinet/in.h>
58 #include <net/ethernet.h>
59 #endif
60 
61 static void
62 ieee80211_process_mimo(struct ieee80211_node *ni, struct ieee80211_rx_stats *rx)
63 {
64 	int i;
65 
66 	/* Verify the required MIMO bits are set */
67 	if ((rx->r_flags & (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI)) !=
68 	    (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI))
69 		return;
70 
71 	/* XXX This assumes the MIMO radios have both ctl and ext chains */
72 	for (i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) {
73 		IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ctl[i], rx->c_rssi_ctl[i]);
74 		IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ext[i], rx->c_rssi_ext[i]);
75 	}
76 
77 	/* XXX This also assumes the MIMO radios have both ctl and ext chains */
78 	for(i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) {
79 		ni->ni_mimo_noise_ctl[i] = rx->c_nf_ctl[i];
80 		ni->ni_mimo_noise_ext[i] = rx->c_nf_ext[i];
81 	}
82 	ni->ni_mimo_chains = rx->c_chain;
83 }
84 
85 int
86 ieee80211_input_mimo(struct ieee80211_node *ni, struct mbuf *m)
87 {
88 	struct ieee80211_rx_stats rxs;
89 
90 	/* try to read stats from mbuf */
91 	bzero(&rxs, sizeof(rxs));
92 	if (ieee80211_get_rx_params(m, &rxs) != 0)
93 		return (-1);
94 
95 	/* XXX should assert IEEE80211_R_NF and IEEE80211_R_RSSI are set */
96 	ieee80211_process_mimo(ni, &rxs);
97 
98 	//return ieee80211_input(ni, m, rx->rssi, rx->nf);
99 	return ni->ni_vap->iv_input(ni, m, &rxs, rxs.c_rssi, rxs.c_nf);
100 }
101 
102 int
103 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf)
104 {
105 	struct ieee80211_rx_stats rx;
106 
107 	rx.r_flags = IEEE80211_R_NF | IEEE80211_R_RSSI;
108 	rx.c_nf = nf;
109 	rx.c_rssi = rssi;
110 
111 	if (!ieee80211_add_rx_params(m, &rx))
112 		return (-1);
113 
114 	return ieee80211_input_mimo_all(ic, m);
115 }
116 
117 int
118 ieee80211_input_mimo_all(struct ieee80211com *ic, struct mbuf *m)
119 {
120 	struct ieee80211vap *vap;
121 	int type = -1;
122 
123 	m->m_flags |= M_BCAST;		/* NB: mark for bpf tap'ing */
124 
125 	/* XXX locking */
126 	TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
127 		struct ieee80211_node *ni;
128 		struct mbuf *mcopy;
129 
130 		/* NB: could check for IFF_UP but this is cheaper */
131 		if (vap->iv_state == IEEE80211_S_INIT)
132 			continue;
133 		/*
134 		 * WDS vap's only receive directed traffic from the
135 		 * station at the ``far end''.  That traffic should
136 		 * be passed through the AP vap the station is associated
137 		 * to--so don't spam them with mcast frames.
138 		 */
139 		if (vap->iv_opmode == IEEE80211_M_WDS)
140 			continue;
141 		if (TAILQ_NEXT(vap, iv_next) != NULL) {
142 			/*
143 			 * Packet contents are changed by ieee80211_decap
144 			 * so do a deep copy of the packet.
145 			 * NB: tags are copied too.
146 			 */
147 			mcopy = m_dup(m, M_NOWAIT);
148 			if (mcopy == NULL) {
149 				/* XXX stat+msg */
150 				continue;
151 			}
152 		} else {
153 			mcopy = m;
154 			m = NULL;
155 		}
156 		ni = ieee80211_ref_node(vap->iv_bss);
157 		type = ieee80211_input_mimo(ni, mcopy);
158 		ieee80211_free_node(ni);
159 	}
160 	if (m != NULL)			/* no vaps, reclaim mbuf */
161 		m_freem(m);
162 	return type;
163 }
164 
165 /*
166  * This function reassembles fragments.
167  *
168  * XXX should handle 3 concurrent reassemblies per-spec.
169  */
170 struct mbuf *
171 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace)
172 {
173 	struct ieee80211vap *vap = ni->ni_vap;
174 	struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
175 	struct ieee80211_frame *lwh;
176 	uint16_t rxseq;
177 	uint8_t fragno;
178 	uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG;
179 	struct mbuf *mfrag;
180 
181 	KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?"));
182 
183 	rxseq = le16toh(*(uint16_t *)wh->i_seq);
184 	fragno = rxseq & IEEE80211_SEQ_FRAG_MASK;
185 
186 	/* Quick way out, if there's nothing to defragment */
187 	if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL)
188 		return m;
189 
190 	/*
191 	 * Remove frag to insure it doesn't get reaped by timer.
192 	 */
193 	if (ni->ni_table == NULL) {
194 		/*
195 		 * Should never happen.  If the node is orphaned (not in
196 		 * the table) then input packets should not reach here.
197 		 * Otherwise, a concurrent request that yanks the table
198 		 * should be blocked by other interlocking and/or by first
199 		 * shutting the driver down.  Regardless, be defensive
200 		 * here and just bail
201 		 */
202 		/* XXX need msg+stat */
203 		m_freem(m);
204 		return NULL;
205 	}
206 	IEEE80211_NODE_LOCK(ni->ni_table);
207 	mfrag = ni->ni_rxfrag[0];
208 	ni->ni_rxfrag[0] = NULL;
209 	IEEE80211_NODE_UNLOCK(ni->ni_table);
210 
211 	/*
212 	 * Validate new fragment is in order and
213 	 * related to the previous ones.
214 	 */
215 	if (mfrag != NULL) {
216 		uint16_t last_rxseq;
217 
218 		lwh = mtod(mfrag, struct ieee80211_frame *);
219 		last_rxseq = le16toh(*(uint16_t *)lwh->i_seq);
220 		/* NB: check seq # and frag together */
221 		if (rxseq == last_rxseq+1 &&
222 		    IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) &&
223 		    IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) {
224 			/* XXX clear MORE_FRAG bit? */
225 			/* track last seqnum and fragno */
226 			*(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq;
227 
228 			m_adj(m, hdrspace);		/* strip header */
229 			m_catpkt(mfrag, m);		/* concatenate */
230 		} else {
231 			/*
232 			 * Unrelated fragment or no space for it,
233 			 * clear current fragments.
234 			 */
235 			m_freem(mfrag);
236 			mfrag = NULL;
237 		}
238 	}
239 
240  	if (mfrag == NULL) {
241 		if (fragno != 0) {		/* !first fragment, discard */
242 			vap->iv_stats.is_rx_defrag++;
243 			IEEE80211_NODE_STAT(ni, rx_defrag);
244 			m_freem(m);
245 			return NULL;
246 		}
247 		mfrag = m;
248 	}
249 	if (more_frag) {			/* more to come, save */
250 		ni->ni_rxfragstamp = ticks;
251 		ni->ni_rxfrag[0] = mfrag;
252 		mfrag = NULL;
253 	}
254 	return mfrag;
255 }
256 
257 void
258 ieee80211_deliver_data(struct ieee80211vap *vap,
259 	struct ieee80211_node *ni, struct mbuf *m)
260 {
261 	struct ether_header *eh = mtod(m, struct ether_header *);
262 	struct ifnet *ifp = vap->iv_ifp;
263 
264 	/* clear driver/net80211 flags before passing up */
265 	m->m_flags &= ~(M_MCAST | M_BCAST);
266 	m_clrprotoflags(m);
267 
268 	/* NB: see hostap_deliver_data, this path doesn't handle hostap */
269 	KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap"));
270 	/*
271 	 * Do accounting.
272 	 */
273 	if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
274 	IEEE80211_NODE_STAT(ni, rx_data);
275 	IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
276 	if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
277 		if (ETHER_IS_BROADCAST(eh->ether_dhost))
278 			m->m_flags |= M_BCAST;
279 		else
280 			m->m_flags |= M_MCAST;
281 		IEEE80211_NODE_STAT(ni, rx_mcast);
282 	} else
283 		IEEE80211_NODE_STAT(ni, rx_ucast);
284 	m->m_pkthdr.rcvif = ifp;
285 
286 	if (ni->ni_vlan != 0) {
287 		/* attach vlan tag */
288 		m->m_pkthdr.ether_vtag = ni->ni_vlan;
289 		m->m_flags |= M_VLANTAG;
290 	}
291 	ifp->if_input(ifp, m);
292 }
293 
294 struct mbuf *
295 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen)
296 {
297 	struct ieee80211_qosframe_addr4 wh;
298 	struct ether_header *eh;
299 	struct llc *llc;
300 
301 	KASSERT(hdrlen <= sizeof(wh),
302 	    ("hdrlen %d > max %zd", hdrlen, sizeof(wh)));
303 
304 	if (m->m_len < hdrlen + sizeof(*llc) &&
305 	    (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) {
306 		vap->iv_stats.is_rx_tooshort++;
307 		/* XXX msg */
308 		return NULL;
309 	}
310 	memcpy(&wh, mtod(m, caddr_t), hdrlen);
311 	llc = (struct llc *)(mtod(m, caddr_t) + hdrlen);
312 	if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP &&
313 	    llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 &&
314 	    llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 &&
315 	    /* NB: preserve AppleTalk frames that have a native SNAP hdr */
316 	    !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) ||
317 	      llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) {
318 		m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh));
319 		llc = NULL;
320 	} else {
321 		m_adj(m, hdrlen - sizeof(*eh));
322 	}
323 	eh = mtod(m, struct ether_header *);
324 	switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) {
325 	case IEEE80211_FC1_DIR_NODS:
326 		IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
327 		IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
328 		break;
329 	case IEEE80211_FC1_DIR_TODS:
330 		IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
331 		IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
332 		break;
333 	case IEEE80211_FC1_DIR_FROMDS:
334 		IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
335 		IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3);
336 		break;
337 	case IEEE80211_FC1_DIR_DSTODS:
338 		IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
339 		IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4);
340 		break;
341 	}
342 #ifndef __NO_STRICT_ALIGNMENT
343 	if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) {
344 		m = ieee80211_realign(vap, m, sizeof(*eh));
345 		if (m == NULL)
346 			return NULL;
347 	}
348 #endif /* !__NO_STRICT_ALIGNMENT */
349 	if (llc != NULL) {
350 		eh = mtod(m, struct ether_header *);
351 		eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh));
352 	}
353 	return m;
354 }
355 
356 /*
357  * Decap a frame encapsulated in a fast-frame/A-MSDU.
358  */
359 struct mbuf *
360 ieee80211_decap1(struct mbuf *m, int *framelen)
361 {
362 #define	FF_LLC_SIZE	(sizeof(struct ether_header) + sizeof(struct llc))
363 	struct ether_header *eh;
364 	struct llc *llc;
365 
366 	/*
367 	 * The frame has an 802.3 header followed by an 802.2
368 	 * LLC header.  The encapsulated frame length is in the
369 	 * first header type field; save that and overwrite it
370 	 * with the true type field found in the second.  Then
371 	 * copy the 802.3 header up to where it belongs and
372 	 * adjust the mbuf contents to remove the void.
373 	 */
374 	if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL)
375 		return NULL;
376 	eh = mtod(m, struct ether_header *);	/* 802.3 header is first */
377 	llc = (struct llc *)&eh[1];		/* 802.2 header follows */
378 	*framelen = ntohs(eh->ether_type)	/* encap'd frame size */
379 		  + sizeof(struct ether_header) - sizeof(struct llc);
380 	eh->ether_type = llc->llc_un.type_snap.ether_type;
381 	ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc),
382 		sizeof(struct ether_header));
383 	m_adj(m, sizeof(struct llc));
384 	return m;
385 #undef FF_LLC_SIZE
386 }
387 
388 /*
389  * Install received rate set information in the node's state block.
390  */
391 int
392 ieee80211_setup_rates(struct ieee80211_node *ni,
393 	const uint8_t *rates, const uint8_t *xrates, int flags)
394 {
395 	struct ieee80211vap *vap = ni->ni_vap;
396 	struct ieee80211_rateset *rs = &ni->ni_rates;
397 
398 	memset(rs, 0, sizeof(*rs));
399 	rs->rs_nrates = rates[1];
400 	memcpy(rs->rs_rates, rates + 2, rs->rs_nrates);
401 	if (xrates != NULL) {
402 		uint8_t nxrates;
403 		/*
404 		 * Tack on 11g extended supported rate element.
405 		 */
406 		nxrates = xrates[1];
407 		if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) {
408 			nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates;
409 			IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni,
410 			    "extended rate set too large; only using "
411 			    "%u of %u rates", nxrates, xrates[1]);
412 			vap->iv_stats.is_rx_rstoobig++;
413 		}
414 		memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates);
415 		rs->rs_nrates += nxrates;
416 	}
417 	return ieee80211_fix_rate(ni, rs, flags);
418 }
419 
420 /*
421  * Send a management frame error response to the specified
422  * station.  If ni is associated with the station then use
423  * it; otherwise allocate a temporary node suitable for
424  * transmitting the frame and then free the reference so
425  * it will go away as soon as the frame has been transmitted.
426  */
427 void
428 ieee80211_send_error(struct ieee80211_node *ni,
429 	const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg)
430 {
431 	struct ieee80211vap *vap = ni->ni_vap;
432 	int istmp;
433 
434 	if (ni == vap->iv_bss) {
435 		if (vap->iv_state != IEEE80211_S_RUN) {
436 			/*
437 			 * XXX hack until we get rid of this routine.
438 			 * We can be called prior to the vap reaching
439 			 * run state under certain conditions in which
440 			 * case iv_bss->ni_chan will not be setup.
441 			 * Check for this explicitly and and just ignore
442 			 * the request.
443 			 */
444 			return;
445 		}
446 		ni = ieee80211_tmp_node(vap, mac);
447 		if (ni == NULL) {
448 			/* XXX msg */
449 			return;
450 		}
451 		istmp = 1;
452 	} else
453 		istmp = 0;
454 	IEEE80211_SEND_MGMT(ni, subtype, arg);
455 	if (istmp)
456 		ieee80211_free_node(ni);
457 }
458 
459 int
460 ieee80211_alloc_challenge(struct ieee80211_node *ni)
461 {
462 	if (ni->ni_challenge == NULL)
463 		ni->ni_challenge = (uint32_t *)
464 		    IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN,
465 		      M_80211_NODE, IEEE80211_M_NOWAIT);
466 	if (ni->ni_challenge == NULL) {
467 		IEEE80211_NOTE(ni->ni_vap,
468 		    IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni,
469 		    "%s", "shared key challenge alloc failed");
470 		/* XXX statistic */
471 	}
472 	return (ni->ni_challenge != NULL);
473 }
474 
475 /*
476  * Parse a Beacon or ProbeResponse frame and return the
477  * useful information in an ieee80211_scanparams structure.
478  * Status is set to 0 if no problems were found; otherwise
479  * a bitmask of IEEE80211_BPARSE_* items is returned that
480  * describes the problems detected.
481  */
482 int
483 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m,
484 	struct ieee80211_channel *rxchan, struct ieee80211_scanparams *scan)
485 {
486 	struct ieee80211vap *vap = ni->ni_vap;
487 	struct ieee80211com *ic = ni->ni_ic;
488 	struct ieee80211_frame *wh;
489 	uint8_t *frm, *efrm;
490 
491 	wh = mtod(m, struct ieee80211_frame *);
492 	frm = (uint8_t *)&wh[1];
493 	efrm = mtod(m, uint8_t *) + m->m_len;
494 	scan->status = 0;
495 	/*
496 	 * beacon/probe response frame format
497 	 *
498 	 * XXX Update from 802.11-2012 - eg where HT is
499 	 *	[8] time stamp
500 	 *	[2] beacon interval
501 	 *	[2] capability information
502 	 *	[tlv] ssid
503 	 *	[tlv] supported rates
504 	 *	[tlv] country information
505 	 *	[tlv] channel switch announcement (CSA)
506 	 *	[tlv] parameter set (FH/DS)
507 	 *	[tlv] erp information
508 	 *	[tlv] extended supported rates
509 	 *	[tlv] WME
510 	 *	[tlv] WPA or RSN
511 	 *	[tlv] HT capabilities
512 	 *	[tlv] HT information
513 	 *	[tlv] VHT capabilities
514 	 *	[tlv] VHT information
515 	 *	[tlv] Atheros capabilities
516 	 *	[tlv] Mesh ID
517 	 *	[tlv] Mesh Configuration
518 	 */
519 	IEEE80211_VERIFY_LENGTH(efrm - frm, 12,
520 	    return (scan->status = IEEE80211_BPARSE_BADIELEN));
521 	memset(scan, 0, sizeof(*scan));
522 	scan->tstamp  = frm;				frm += 8;
523 	scan->bintval = le16toh(*(uint16_t *)frm);	frm += 2;
524 	scan->capinfo = le16toh(*(uint16_t *)frm);	frm += 2;
525 	scan->bchan = ieee80211_chan2ieee(ic, rxchan);
526 	scan->chan = scan->bchan;
527 	scan->ies = frm;
528 	scan->ies_len = efrm - frm;
529 
530 	while (efrm - frm > 1) {
531 		IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2,
532 		    return (scan->status = IEEE80211_BPARSE_BADIELEN));
533 		switch (*frm) {
534 		case IEEE80211_ELEMID_SSID:
535 			scan->ssid = frm;
536 			break;
537 		case IEEE80211_ELEMID_RATES:
538 			scan->rates = frm;
539 			break;
540 		case IEEE80211_ELEMID_COUNTRY:
541 			scan->country = frm;
542 			break;
543 		case IEEE80211_ELEMID_CSA:
544 			scan->csa = frm;
545 			break;
546 		case IEEE80211_ELEMID_QUIET:
547 			scan->quiet = frm;
548 			break;
549 		case IEEE80211_ELEMID_FHPARMS:
550 			if (ic->ic_phytype == IEEE80211_T_FH) {
551 				scan->fhdwell = le16dec(&frm[2]);
552 				scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]);
553 				scan->fhindex = frm[6];
554 			}
555 			break;
556 		case IEEE80211_ELEMID_DSPARMS:
557 			/*
558 			 * XXX hack this since depending on phytype
559 			 * is problematic for multi-mode devices.
560 			 */
561 			if (ic->ic_phytype != IEEE80211_T_FH)
562 				scan->chan = frm[2];
563 			break;
564 		case IEEE80211_ELEMID_TIM:
565 			/* XXX ATIM? */
566 			scan->tim = frm;
567 			scan->timoff = frm - mtod(m, uint8_t *);
568 			break;
569 		case IEEE80211_ELEMID_IBSSPARMS:
570 		case IEEE80211_ELEMID_CFPARMS:
571 		case IEEE80211_ELEMID_PWRCNSTR:
572 		case IEEE80211_ELEMID_BSSLOAD:
573 		case IEEE80211_ELEMID_APCHANREP:
574 			/* NB: avoid debugging complaints */
575 			break;
576 		case IEEE80211_ELEMID_XRATES:
577 			scan->xrates = frm;
578 			break;
579 		case IEEE80211_ELEMID_ERP:
580 			if (frm[1] != 1) {
581 				IEEE80211_DISCARD_IE(vap,
582 				    IEEE80211_MSG_ELEMID, wh, "ERP",
583 				    "bad len %u", frm[1]);
584 				vap->iv_stats.is_rx_elem_toobig++;
585 				break;
586 			}
587 			scan->erp = frm[2] | 0x100;
588 			break;
589 		case IEEE80211_ELEMID_HTCAP:
590 			scan->htcap = frm;
591 			break;
592 		case IEEE80211_ELEMID_VHT_CAP:
593 			scan->vhtcap = frm;
594 			break;
595 		case IEEE80211_ELEMID_VHT_OPMODE:
596 			scan->vhtopmode = frm;
597 			break;
598 		case IEEE80211_ELEMID_RSN:
599 			scan->rsn = frm;
600 			break;
601 		case IEEE80211_ELEMID_HTINFO:
602 			scan->htinfo = frm;
603 			break;
604 #ifdef IEEE80211_SUPPORT_MESH
605 		case IEEE80211_ELEMID_MESHID:
606 			scan->meshid = frm;
607 			break;
608 		case IEEE80211_ELEMID_MESHCONF:
609 			scan->meshconf = frm;
610 			break;
611 #endif
612 		/* Extended capabilities; nothing handles it for now */
613 		case IEEE80211_ELEMID_EXTCAP:
614 			break;
615 		case IEEE80211_ELEMID_VENDOR:
616 			if (iswpaoui(frm))
617 				scan->wpa = frm;
618 			else if (iswmeparam(frm) || iswmeinfo(frm))
619 				scan->wme = frm;
620 #ifdef IEEE80211_SUPPORT_SUPERG
621 			else if (isatherosoui(frm))
622 				scan->ath = frm;
623 #endif
624 #ifdef IEEE80211_SUPPORT_TDMA
625 			else if (istdmaoui(frm))
626 				scan->tdma = frm;
627 #endif
628 			else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
629 				/*
630 				 * Accept pre-draft HT ie's if the
631 				 * standard ones have not been seen.
632 				 */
633 				if (ishtcapoui(frm)) {
634 					if (scan->htcap == NULL)
635 						scan->htcap = frm;
636 				} else if (ishtinfooui(frm)) {
637 					if (scan->htinfo == NULL)
638 						scan->htcap = frm;
639 				}
640 			}
641 			break;
642 		default:
643 			IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID,
644 			    wh, "unhandled",
645 			    "id %u, len %u", *frm, frm[1]);
646 			vap->iv_stats.is_rx_elem_unknown++;
647 			break;
648 		}
649 		frm += frm[1] + 2;
650 	}
651 	IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE,
652 	    scan->status |= IEEE80211_BPARSE_RATES_INVALID);
653 	if (scan->rates != NULL && scan->xrates != NULL) {
654 		/*
655 		 * NB: don't process XRATES if RATES is missing.  This
656 		 * avoids a potential null ptr deref and should be ok
657 		 * as the return code will already note RATES is missing
658 		 * (so callers shouldn't otherwise process the frame).
659 		 */
660 		IEEE80211_VERIFY_ELEMENT(scan->xrates,
661 		    IEEE80211_RATE_MAXSIZE - scan->rates[1],
662 		    scan->status |= IEEE80211_BPARSE_XRATES_INVALID);
663 	}
664 	IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN,
665 	    scan->status |= IEEE80211_BPARSE_SSID_INVALID);
666 	if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) {
667 		/*
668 		 * Frame was received on a channel different from the
669 		 * one indicated in the DS params element id;
670 		 * silently discard it.
671 		 *
672 		 * NB: this can happen due to signal leakage.
673 		 *     But we should take it for FH phy because
674 		 *     the rssi value should be correct even for
675 		 *     different hop pattern in FH.
676 		 */
677 		IEEE80211_DISCARD(vap,
678 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
679 		    wh, NULL, "for off-channel %u (bchan=%u)",
680 		    scan->chan, scan->bchan);
681 		vap->iv_stats.is_rx_chanmismatch++;
682 		scan->status |= IEEE80211_BPARSE_OFFCHAN;
683 	}
684 	if (!(IEEE80211_BINTVAL_MIN <= scan->bintval &&
685 	      scan->bintval <= IEEE80211_BINTVAL_MAX)) {
686 		IEEE80211_DISCARD(vap,
687 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
688 		    wh, NULL, "bogus beacon interval (%d TU)",
689 		    (int) scan->bintval);
690 		vap->iv_stats.is_rx_badbintval++;
691 		scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID;
692 	}
693 	if (scan->country != NULL) {
694 		/*
695 		 * Validate we have at least enough data to extract
696 		 * the country code.  Not sure if we should return an
697 		 * error instead of discarding the IE; consider this
698 		 * being lenient as we don't depend on the data for
699 		 * correct operation.
700 		 */
701 		IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t),
702 		    scan->country = NULL);
703 	}
704 	if (scan->csa != NULL) {
705 		/*
706 		 * Validate Channel Switch Announcement; this must
707 		 * be the correct length or we toss the frame.
708 		 */
709 		IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t),
710 		    scan->status |= IEEE80211_BPARSE_CSA_INVALID);
711 	}
712 	/*
713 	 * Process HT ie's.  This is complicated by our
714 	 * accepting both the standard ie's and the pre-draft
715 	 * vendor OUI ie's that some vendors still use/require.
716 	 */
717 	if (scan->htcap != NULL) {
718 		IEEE80211_VERIFY_LENGTH(scan->htcap[1],
719 		     scan->htcap[0] == IEEE80211_ELEMID_VENDOR ?
720 			 4 + sizeof(struct ieee80211_ie_htcap)-2 :
721 			 sizeof(struct ieee80211_ie_htcap)-2,
722 		     scan->htcap = NULL);
723 	}
724 	if (scan->htinfo != NULL) {
725 		IEEE80211_VERIFY_LENGTH(scan->htinfo[1],
726 		     scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ?
727 			 4 + sizeof(struct ieee80211_ie_htinfo)-2 :
728 			 sizeof(struct ieee80211_ie_htinfo)-2,
729 		     scan->htinfo = NULL);
730 	}
731 
732 	/* Process VHT IEs */
733 	if (scan->vhtcap != NULL) {
734 		IEEE80211_VERIFY_LENGTH(scan->vhtcap[1],
735 		    sizeof(struct ieee80211_ie_vhtcap) - 2,
736 		    scan->vhtcap = NULL);
737 	}
738 	if (scan->vhtopmode != NULL) {
739 		IEEE80211_VERIFY_LENGTH(scan->vhtopmode[1],
740 		    sizeof(struct ieee80211_ie_vht_operation) - 2,
741 		    scan->vhtopmode = NULL);
742 	}
743 
744 	return scan->status;
745 }
746 
747 /*
748  * Parse an Action frame.  Return 0 on success, non-zero on failure.
749  */
750 int
751 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m)
752 {
753 	struct ieee80211vap *vap = ni->ni_vap;
754 	const struct ieee80211_action *ia;
755 	struct ieee80211_frame *wh;
756 	uint8_t *frm, *efrm;
757 
758 	/*
759 	 * action frame format:
760 	 *	[1] category
761 	 *	[1] action
762 	 *	[tlv] parameters
763 	 */
764 	wh = mtod(m, struct ieee80211_frame *);
765 	frm = (u_int8_t *)&wh[1];
766 	efrm = mtod(m, u_int8_t *) + m->m_len;
767 	IEEE80211_VERIFY_LENGTH(efrm - frm,
768 		sizeof(struct ieee80211_action), return EINVAL);
769 	ia = (const struct ieee80211_action *) frm;
770 
771 	vap->iv_stats.is_rx_action++;
772 	IEEE80211_NODE_STAT(ni, rx_action);
773 
774 	/* verify frame payloads but defer processing */
775 	switch (ia->ia_category) {
776 	case IEEE80211_ACTION_CAT_BA:
777 		switch (ia->ia_action) {
778 		case IEEE80211_ACTION_BA_ADDBA_REQUEST:
779 			IEEE80211_VERIFY_LENGTH(efrm - frm,
780 			    sizeof(struct ieee80211_action_ba_addbarequest),
781 			    return EINVAL);
782 			break;
783 		case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
784 			IEEE80211_VERIFY_LENGTH(efrm - frm,
785 			    sizeof(struct ieee80211_action_ba_addbaresponse),
786 			    return EINVAL);
787 			break;
788 		case IEEE80211_ACTION_BA_DELBA:
789 			IEEE80211_VERIFY_LENGTH(efrm - frm,
790 			    sizeof(struct ieee80211_action_ba_delba),
791 			    return EINVAL);
792 			break;
793 		}
794 		break;
795 	case IEEE80211_ACTION_CAT_HT:
796 		switch (ia->ia_action) {
797 		case IEEE80211_ACTION_HT_TXCHWIDTH:
798 			IEEE80211_VERIFY_LENGTH(efrm - frm,
799 			    sizeof(struct ieee80211_action_ht_txchwidth),
800 			    return EINVAL);
801 			break;
802 		case IEEE80211_ACTION_HT_MIMOPWRSAVE:
803 			IEEE80211_VERIFY_LENGTH(efrm - frm,
804 			    sizeof(struct ieee80211_action_ht_mimopowersave),
805 			    return EINVAL);
806 			break;
807 		}
808 		break;
809 #ifdef IEEE80211_SUPPORT_MESH
810 	case IEEE80211_ACTION_CAT_MESH:
811 		switch (ia->ia_action) {
812 		case IEEE80211_ACTION_MESH_LMETRIC:
813 			/*
814 			 * XXX: verification is true only if we are using
815 			 * Airtime link metric (default)
816 			 */
817 			IEEE80211_VERIFY_LENGTH(efrm - frm,
818 			    sizeof(struct ieee80211_meshlmetric_ie),
819 			    return EINVAL);
820 			break;
821 		case IEEE80211_ACTION_MESH_HWMP:
822 			/* verify something */
823 			break;
824 		case IEEE80211_ACTION_MESH_GANN:
825 			IEEE80211_VERIFY_LENGTH(efrm - frm,
826 			    sizeof(struct ieee80211_meshgann_ie),
827 			    return EINVAL);
828 			break;
829 		case IEEE80211_ACTION_MESH_CC:
830 		case IEEE80211_ACTION_MESH_MCCA_SREQ:
831 		case IEEE80211_ACTION_MESH_MCCA_SREP:
832 		case IEEE80211_ACTION_MESH_MCCA_AREQ:
833 		case IEEE80211_ACTION_MESH_MCCA_ADVER:
834 		case IEEE80211_ACTION_MESH_MCCA_TRDOWN:
835 		case IEEE80211_ACTION_MESH_TBTT_REQ:
836 		case IEEE80211_ACTION_MESH_TBTT_RES:
837 			/* reject these early on, not implemented */
838 			IEEE80211_DISCARD(vap,
839 			    IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
840 			    wh, NULL, "not implemented yet, act=0x%02X",
841 			    ia->ia_action);
842 			return EINVAL;
843 		}
844 		break;
845 	case IEEE80211_ACTION_CAT_SELF_PROT:
846 		/* If TA or RA group address discard silently */
847 		if (IEEE80211_IS_MULTICAST(wh->i_addr1) ||
848 			IEEE80211_IS_MULTICAST(wh->i_addr2))
849 			return EINVAL;
850 		/*
851 		 * XXX: Should we verify complete length now or it is
852 		 * to varying in sizes?
853 		 */
854 		switch (ia->ia_action) {
855 		case IEEE80211_ACTION_MESHPEERING_CONFIRM:
856 		case IEEE80211_ACTION_MESHPEERING_CLOSE:
857 			/* is not a peering candidate (yet) */
858 			if (ni == vap->iv_bss)
859 				return EINVAL;
860 			break;
861 		}
862 		break;
863 #endif
864 	case IEEE80211_ACTION_CAT_VHT:
865 		printf("%s: TODO: VHT handling!\n", __func__);
866 		break;
867 	}
868 	return 0;
869 }
870 
871 #ifdef IEEE80211_DEBUG
872 /*
873  * Debugging support.
874  */
875 void
876 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag,
877 	uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid)
878 {
879 	printf("[%s] discard %s frame, ssid mismatch: ",
880 		ether_sprintf(mac), tag);
881 	ieee80211_print_essid(ssid + 2, ssid[1]);
882 	printf("\n");
883 }
884 
885 /*
886  * Return the bssid of a frame.
887  */
888 static const uint8_t *
889 ieee80211_getbssid(const struct ieee80211vap *vap,
890 	const struct ieee80211_frame *wh)
891 {
892 	if (vap->iv_opmode == IEEE80211_M_STA)
893 		return wh->i_addr2;
894 	if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS)
895 		return wh->i_addr1;
896 	if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL)
897 		return wh->i_addr1;
898 	return wh->i_addr3;
899 }
900 
901 #include <machine/stdarg.h>
902 
903 void
904 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...)
905 {
906 	char buf[128];		/* XXX */
907 	va_list ap;
908 
909 	va_start(ap, fmt);
910 	vsnprintf(buf, sizeof(buf), fmt, ap);
911 	va_end(ap);
912 
913 	if_printf(vap->iv_ifp, "%s", buf);	/* NB: no \n */
914 }
915 
916 void
917 ieee80211_note_frame(const struct ieee80211vap *vap,
918 	const struct ieee80211_frame *wh,
919 	const char *fmt, ...)
920 {
921 	char buf[128];		/* XXX */
922 	va_list ap;
923 
924 	va_start(ap, fmt);
925 	vsnprintf(buf, sizeof(buf), fmt, ap);
926 	va_end(ap);
927 	if_printf(vap->iv_ifp, "[%s] %s\n",
928 		ether_sprintf(ieee80211_getbssid(vap, wh)), buf);
929 }
930 
931 void
932 ieee80211_note_mac(const struct ieee80211vap *vap,
933 	const uint8_t mac[IEEE80211_ADDR_LEN],
934 	const char *fmt, ...)
935 {
936 	char buf[128];		/* XXX */
937 	va_list ap;
938 
939 	va_start(ap, fmt);
940 	vsnprintf(buf, sizeof(buf), fmt, ap);
941 	va_end(ap);
942 	if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf);
943 }
944 
945 void
946 ieee80211_discard_frame(const struct ieee80211vap *vap,
947 	const struct ieee80211_frame *wh,
948 	const char *type, const char *fmt, ...)
949 {
950 	va_list ap;
951 
952 	if_printf(vap->iv_ifp, "[%s] discard ",
953 		ether_sprintf(ieee80211_getbssid(vap, wh)));
954 	printf("%s frame, ", type != NULL ? type :
955 	    ieee80211_mgt_subtype_name(wh->i_fc[0]));
956 	va_start(ap, fmt);
957 	vprintf(fmt, ap);
958 	va_end(ap);
959 	printf("\n");
960 }
961 
962 void
963 ieee80211_discard_ie(const struct ieee80211vap *vap,
964 	const struct ieee80211_frame *wh,
965 	const char *type, const char *fmt, ...)
966 {
967 	va_list ap;
968 
969 	if_printf(vap->iv_ifp, "[%s] discard ",
970 		ether_sprintf(ieee80211_getbssid(vap, wh)));
971 	if (type != NULL)
972 		printf("%s information element, ", type);
973 	else
974 		printf("information element, ");
975 	va_start(ap, fmt);
976 	vprintf(fmt, ap);
977 	va_end(ap);
978 	printf("\n");
979 }
980 
981 void
982 ieee80211_discard_mac(const struct ieee80211vap *vap,
983 	const uint8_t mac[IEEE80211_ADDR_LEN],
984 	const char *type, const char *fmt, ...)
985 {
986 	va_list ap;
987 
988 	if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac));
989 	if (type != NULL)
990 		printf("%s frame, ", type);
991 	else
992 		printf("frame, ");
993 	va_start(ap, fmt);
994 	vprintf(fmt, ap);
995 	va_end(ap);
996 	printf("\n");
997 }
998 #endif /* IEEE80211_DEBUG */
999