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: releng/8.2/sys/net80211/ieee80211_hostap.c 215621 2010-11-21 11:03:22Z bschmidt $");
29 #endif
30
31 /*
32 * IEEE 802.11 HOSTAP 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_hostap.h>
59 #include <net80211/ieee80211_input.h>
60 #ifdef IEEE80211_SUPPORT_SUPERG
61 #include <net80211/ieee80211_superg.h>
62 #endif
63 #include <net80211/ieee80211_wds.h>
64
65 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2)
66
67 static void hostap_vattach(struct ieee80211vap *);
68 static int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int);
69 static int hostap_input(struct ieee80211_node *ni, struct mbuf *m,
70 int rssi, int nf);
71 static void hostap_deliver_data(struct ieee80211vap *,
72 struct ieee80211_node *, struct mbuf *);
73 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *,
74 int subtype, int rssi, int nf);
75 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int);
76 static void hostap_recv_pspoll(struct ieee80211_node *, struct mbuf *);
77
78 void
79 ieee80211_hostap_attach(struct ieee80211com *ic)
80 {
81 ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach;
82 }
83
84 void
85 ieee80211_hostap_detach(struct ieee80211com *ic)
86 {
87 }
88
89 static void
90 hostap_vdetach(struct ieee80211vap *vap)
91 {
92 }
93
94 static void
95 hostap_vattach(struct ieee80211vap *vap)
96 {
97 vap->iv_newstate = hostap_newstate;
98 vap->iv_input = hostap_input;
99 vap->iv_recv_mgmt = hostap_recv_mgmt;
100 vap->iv_recv_ctl = hostap_recv_ctl;
101 vap->iv_opdetach = hostap_vdetach;
102 vap->iv_deliver_data = hostap_deliver_data;
103 }
104
105 static void
106 sta_disassoc(void *arg, struct ieee80211_node *ni)
107 {
108 struct ieee80211vap *vap = arg;
109
110 if (ni->ni_vap == vap && ni->ni_associd != 0) {
111 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC,
112 IEEE80211_REASON_ASSOC_LEAVE);
113 ieee80211_node_leave(ni);
114 }
115 }
116
117 static void
118 sta_csa(void *arg, struct ieee80211_node *ni)
119 {
120 struct ieee80211vap *vap = arg;
121
122 if (ni->ni_vap == vap && ni->ni_associd != 0)
123 if (ni->ni_inact > vap->iv_inact_init) {
124 ni->ni_inact = vap->iv_inact_init;
125 IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
126 "%s: inact %u", __func__, ni->ni_inact);
127 }
128 }
129
130 static void
131 sta_drop(void *arg, struct ieee80211_node *ni)
132 {
133 struct ieee80211vap *vap = arg;
134
135 if (ni->ni_vap == vap && ni->ni_associd != 0)
136 ieee80211_node_leave(ni);
137 }
138
139 /*
140 * Does a channel change require associated stations to re-associate
141 * so protocol state is correct. This is used when doing CSA across
142 * bands or similar (e.g. HT -> legacy).
143 */
144 static int
145 isbandchange(struct ieee80211com *ic)
146 {
147 return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) &
148 (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF |
149 IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0;
150 }
151
152 /*
153 * IEEE80211_M_HOSTAP vap state machine handler.
154 */
155 static int
156 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
157 {
158 struct ieee80211com *ic = vap->iv_ic;
159 enum ieee80211_state ostate;
160
161 IEEE80211_LOCK_ASSERT(ic);
162
163 ostate = vap->iv_state;
164 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
165 __func__, ieee80211_state_name[ostate],
166 ieee80211_state_name[nstate], arg);
167 vap->iv_state = nstate; /* state transition */
168 if (ostate != IEEE80211_S_SCAN)
169 ieee80211_cancel_scan(vap); /* background scan */
170 switch (nstate) {
171 case IEEE80211_S_INIT:
172 switch (ostate) {
173 case IEEE80211_S_SCAN:
174 ieee80211_cancel_scan(vap);
175 break;
176 case IEEE80211_S_CAC:
177 ieee80211_dfs_cac_stop(vap);
178 break;
179 case IEEE80211_S_RUN:
180 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
181 break;
182 default:
183 break;
184 }
185 if (ostate != IEEE80211_S_INIT) {
186 /* NB: optimize INIT -> INIT case */
187 ieee80211_reset_bss(vap);
188 }
189 if (vap->iv_auth->ia_detach != NULL)
190 vap->iv_auth->ia_detach(vap);
191 break;
192 case IEEE80211_S_SCAN:
193 switch (ostate) {
194 case IEEE80211_S_CSA:
195 case IEEE80211_S_RUN:
196 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
197 /*
198 * Clear overlapping BSS state; the beacon frame
199 * will be reconstructed on transition to the RUN
200 * state and the timeout routines check if the flag
201 * is set before doing anything so this is sufficient.
202 */
203 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
204 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
205 /* fall thru... */
206 case IEEE80211_S_CAC:
207 /*
208 * NB: We may get here because of a manual channel
209 * change in which case we need to stop CAC
210 * XXX no need to stop if ostate RUN but it's ok
211 */
212 ieee80211_dfs_cac_stop(vap);
213 /* fall thru... */
214 case IEEE80211_S_INIT:
215 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
216 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
217 /*
218 * Already have a channel; bypass the
219 * scan and startup immediately.
220 * ieee80211_create_ibss will call back to
221 * move us to RUN state.
222 */
223 ieee80211_create_ibss(vap, vap->iv_des_chan);
224 break;
225 }
226 /*
227 * Initiate a scan. We can come here as a result
228 * of an IEEE80211_IOC_SCAN_REQ too in which case
229 * the vap will be marked with IEEE80211_FEXT_SCANREQ
230 * and the scan request parameters will be present
231 * in iv_scanreq. Otherwise we do the default.
232 */
233 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
234 ieee80211_check_scan(vap,
235 vap->iv_scanreq_flags,
236 vap->iv_scanreq_duration,
237 vap->iv_scanreq_mindwell,
238 vap->iv_scanreq_maxdwell,
239 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
240 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
241 } else
242 ieee80211_check_scan_current(vap);
243 break;
244 case IEEE80211_S_SCAN:
245 /*
246 * A state change requires a reset; scan.
247 */
248 ieee80211_check_scan_current(vap);
249 break;
250 default:
251 break;
252 }
253 break;
254 case IEEE80211_S_CAC:
255 /*
256 * Start CAC on a DFS channel. We come here when starting
257 * a bss on a DFS channel (see ieee80211_create_ibss).
258 */
259 ieee80211_dfs_cac_start(vap);
260 break;
261 case IEEE80211_S_RUN:
262 if (vap->iv_flags & IEEE80211_F_WPA) {
263 /* XXX validate prerequisites */
264 }
265 switch (ostate) {
266 case IEEE80211_S_INIT:
267 /*
268 * Already have a channel; bypass the
269 * scan and startup immediately.
270 * Note that ieee80211_create_ibss will call
271 * back to do a RUN->RUN state change.
272 */
273 ieee80211_create_ibss(vap,
274 ieee80211_ht_adjust_channel(ic,
275 ic->ic_curchan, vap->iv_flags_ht));
276 /* NB: iv_bss is changed on return */
277 break;
278 case IEEE80211_S_CAC:
279 /*
280 * NB: This is the normal state change when CAC
281 * expires and no radar was detected; no need to
282 * clear the CAC timer as it's already expired.
283 */
284 /* fall thru... */
285 case IEEE80211_S_CSA:
286 /*
287 * Shorten inactivity timer of associated stations
288 * to weed out sta's that don't follow a CSA.
289 */
290 ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap);
291 /*
292 * Update bss node channel to reflect where
293 * we landed after CSA.
294 */
295 ieee80211_node_set_chan(vap->iv_bss,
296 ieee80211_ht_adjust_channel(ic, ic->ic_curchan,
297 ieee80211_htchanflags(vap->iv_bss->ni_chan)));
298 /* XXX bypass debug msgs */
299 break;
300 case IEEE80211_S_SCAN:
301 case IEEE80211_S_RUN:
302 #ifdef IEEE80211_DEBUG
303 if (ieee80211_msg_debug(vap)) {
304 struct ieee80211_node *ni = vap->iv_bss;
305 ieee80211_note(vap,
306 "synchronized with %s ssid ",
307 ether_sprintf(ni->ni_bssid));
308 ieee80211_print_essid(ni->ni_essid,
309 ni->ni_esslen);
310 /* XXX MCS/HT */
311 printf(" channel %d start %uMb\n",
312 ieee80211_chan2ieee(ic, ic->ic_curchan),
313 IEEE80211_RATE2MBS(ni->ni_txrate));
314 }
315 #endif
316 break;
317 default:
318 break;
319 }
320 /*
321 * Start/stop the authenticator. We delay until here
322 * to allow configuration to happen out of order.
323 */
324 if (vap->iv_auth->ia_attach != NULL) {
325 /* XXX check failure */
326 vap->iv_auth->ia_attach(vap);
327 } else if (vap->iv_auth->ia_detach != NULL) {
328 vap->iv_auth->ia_detach(vap);
329 }
330 ieee80211_node_authorize(vap->iv_bss);
331 break;
332 case IEEE80211_S_CSA:
333 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) {
334 /*
335 * On a ``band change'' silently drop associated
336 * stations as they must re-associate before they
337 * can pass traffic (as otherwise protocol state
338 * such as capabilities and the negotiated rate
339 * set may/will be wrong).
340 */
341 ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap);
342 }
343 break;
344 default:
345 break;
346 }
347 return 0;
348 }
349
350 static void
351 hostap_deliver_data(struct ieee80211vap *vap,
352 struct ieee80211_node *ni, struct mbuf *m)
353 {
354 struct ether_header *eh = mtod(m, struct ether_header *);
355 struct ifnet *ifp = vap->iv_ifp;
356
357 /* clear driver/net80211 flags before passing up */
358 m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST);
359
360 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP,
361 ("gack, opmode %d", vap->iv_opmode));
362 /*
363 * Do accounting.
364 */
365 ifp->if_ipackets++;
366 IEEE80211_NODE_STAT(ni, rx_data);
367 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
368 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
369 m->m_flags |= M_MCAST; /* XXX M_BCAST? */
370 IEEE80211_NODE_STAT(ni, rx_mcast);
371 } else
372 IEEE80211_NODE_STAT(ni, rx_ucast);
373
374 /* perform as a bridge within the AP */
375 if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) {
376 struct mbuf *mcopy = NULL;
377
378 if (m->m_flags & M_MCAST) {
379 mcopy = m_dup(m, M_DONTWAIT);
380 if (mcopy == NULL)
381 ifp->if_oerrors++;
382 else
383 mcopy->m_flags |= M_MCAST;
384 } else {
385 /*
386 * Check if the destination is associated with the
387 * same vap and authorized to receive traffic.
388 * Beware of traffic destined for the vap itself;
389 * sending it will not work; just let it be delivered
390 * normally.
391 */
392 struct ieee80211_node *sta = ieee80211_find_vap_node(
393 &vap->iv_ic->ic_sta, vap, eh->ether_dhost);
394 if (sta != NULL) {
395 if (ieee80211_node_is_authorized(sta)) {
396 /*
397 * Beware of sending to ourself; this
398 * needs to happen via the normal
399 * input path.
400 */
401 if (sta != vap->iv_bss) {
402 mcopy = m;
403 m = NULL;
404 }
405 } else {
406 vap->iv_stats.is_rx_unauth++;
407 IEEE80211_NODE_STAT(sta, rx_unauth);
408 }
409 ieee80211_free_node(sta);
410 }
411 }
412 if (mcopy != NULL) {
413 int len, err;
414 len = mcopy->m_pkthdr.len;
415 err = ifp->if_transmit(ifp, mcopy);
416 if (err) {
417 /* NB: IFQ_HANDOFF reclaims mcopy */
418 } else {
419 ifp->if_opackets++;
420 }
421 }
422 }
423 if (m != NULL) {
424 /*
425 * Mark frame as coming from vap's interface.
426 */
427 m->m_pkthdr.rcvif = ifp;
428 if (m->m_flags & M_MCAST) {
429 /*
430 * Spam DWDS vap's w/ multicast traffic.
431 */
432 /* XXX only if dwds in use? */
433 ieee80211_dwds_mcast(vap, m);
434 }
435 if (ni->ni_vlan != 0) {
436 /* attach vlan tag */
437 m->m_pkthdr.ether_vtag = ni->ni_vlan;
438 m->m_flags |= M_VLANTAG;
439 }
440 ifp->if_input(ifp, m);
441 }
442 }
443
444 /*
445 * Decide if a received management frame should be
446 * printed when debugging is enabled. This filters some
447 * of the less interesting frames that come frequently
448 * (e.g. beacons).
449 */
450 static __inline int
451 doprint(struct ieee80211vap *vap, int subtype)
452 {
453 switch (subtype) {
454 case IEEE80211_FC0_SUBTYPE_BEACON:
455 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
456 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
457 return 0;
458 }
459 return 1;
460 }
461
462 /*
463 * Process a received frame. The node associated with the sender
464 * should be supplied. If nothing was found in the node table then
465 * the caller is assumed to supply a reference to iv_bss instead.
466 * The RSSI and a timestamp are also supplied. The RSSI data is used
467 * during AP scanning to select a AP to associate with; it can have
468 * any units so long as values have consistent units and higher values
469 * mean ``better signal''. The receive timestamp is currently not used
470 * by the 802.11 layer.
471 */
472 static int
473 hostap_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
474 {
475 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
476 #define HAS_SEQ(type) ((type & 0x4) == 0)
477 struct ieee80211vap *vap = ni->ni_vap;
478 struct ieee80211com *ic = ni->ni_ic;
479 struct ifnet *ifp = vap->iv_ifp;
480 struct ieee80211_frame *wh;
481 struct ieee80211_key *key;
482 struct ether_header *eh;
483 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
484 uint8_t dir, type, subtype, qos;
485 uint8_t *bssid;
486 uint16_t rxseq;
487
488 if (m->m_flags & M_AMPDU_MPDU) {
489 /*
490 * Fastpath for A-MPDU reorder q resubmission. Frames
491 * w/ M_AMPDU_MPDU marked have already passed through
492 * here but were received out of order and been held on
493 * the reorder queue. When resubmitted they are marked
494 * with the M_AMPDU_MPDU flag and we can bypass most of
495 * the normal processing.
496 */
497 wh = mtod(m, struct ieee80211_frame *);
498 type = IEEE80211_FC0_TYPE_DATA;
499 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
500 subtype = IEEE80211_FC0_SUBTYPE_QOS;
501 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
502 goto resubmit_ampdu;
503 }
504
505 KASSERT(ni != NULL, ("null node"));
506 ni->ni_inact = ni->ni_inact_reload;
507
508 type = -1; /* undefined */
509
510 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
511 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
512 ni->ni_macaddr, NULL,
513 "too short (1): len %u", m->m_pkthdr.len);
514 vap->iv_stats.is_rx_tooshort++;
515 goto out;
516 }
517 /*
518 * Bit of a cheat here, we use a pointer for a 3-address
519 * frame format but don't reference fields past outside
520 * ieee80211_frame_min w/o first validating the data is
521 * present.
522 */
523 wh = mtod(m, struct ieee80211_frame *);
524
525 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
526 IEEE80211_FC0_VERSION_0) {
527 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
528 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
529 wh->i_fc[0], wh->i_fc[1]);
530 vap->iv_stats.is_rx_badversion++;
531 goto err;
532 }
533
534 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
535 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
536 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
537 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
538 if (dir != IEEE80211_FC1_DIR_NODS)
539 bssid = wh->i_addr1;
540 else if (type == IEEE80211_FC0_TYPE_CTL)
541 bssid = wh->i_addr1;
542 else {
543 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
544 IEEE80211_DISCARD_MAC(vap,
545 IEEE80211_MSG_ANY, ni->ni_macaddr,
546 NULL, "too short (2): len %u",
547 m->m_pkthdr.len);
548 vap->iv_stats.is_rx_tooshort++;
549 goto out;
550 }
551 bssid = wh->i_addr3;
552 }
553 /*
554 * Validate the bssid.
555 */
556 if (!(type == IEEE80211_FC0_TYPE_MGT &&
557 subtype == IEEE80211_FC0_SUBTYPE_BEACON) &&
558 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
559 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
560 /* not interested in */
561 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
562 bssid, NULL, "%s", "not to bss");
563 vap->iv_stats.is_rx_wrongbss++;
564 goto out;
565 }
566
567 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
568 ni->ni_noise = nf;
569 if (HAS_SEQ(type)) {
570 uint8_t tid = ieee80211_gettid(wh);
571 if (IEEE80211_QOS_HAS_SEQ(wh) &&
572 TID_TO_WME_AC(tid) >= WME_AC_VI)
573 ic->ic_wme.wme_hipri_traffic++;
574 rxseq = le16toh(*(uint16_t *)wh->i_seq);
575 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
576 (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
577 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
578 /* duplicate, discard */
579 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
580 bssid, "duplicate",
581 "seqno <%u,%u> fragno <%u,%u> tid %u",
582 rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
583 ni->ni_rxseqs[tid] >>
584 IEEE80211_SEQ_SEQ_SHIFT,
585 rxseq & IEEE80211_SEQ_FRAG_MASK,
586 ni->ni_rxseqs[tid] &
587 IEEE80211_SEQ_FRAG_MASK,
588 tid);
589 vap->iv_stats.is_rx_dup++;
590 IEEE80211_NODE_STAT(ni, rx_dup);
591 goto out;
592 }
593 ni->ni_rxseqs[tid] = rxseq;
594 }
595 }
596
597 switch (type) {
598 case IEEE80211_FC0_TYPE_DATA:
599 hdrspace = ieee80211_hdrspace(ic, wh);
600 if (m->m_len < hdrspace &&
601 (m = m_pullup(m, hdrspace)) == NULL) {
602 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
603 ni->ni_macaddr, NULL,
604 "data too short: expecting %u", hdrspace);
605 vap->iv_stats.is_rx_tooshort++;
606 goto out; /* XXX */
607 }
608 if (!(dir == IEEE80211_FC1_DIR_TODS ||
609 (dir == IEEE80211_FC1_DIR_DSTODS &&
610 (vap->iv_flags & IEEE80211_F_DWDS)))) {
611 if (dir != IEEE80211_FC1_DIR_DSTODS) {
612 IEEE80211_DISCARD(vap,
613 IEEE80211_MSG_INPUT, wh, "data",
614 "incorrect dir 0x%x", dir);
615 } else {
616 IEEE80211_DISCARD(vap,
617 IEEE80211_MSG_INPUT |
618 IEEE80211_MSG_WDS, wh,
619 "4-address data",
620 "%s", "DWDS not enabled");
621 }
622 vap->iv_stats.is_rx_wrongdir++;
623 goto out;
624 }
625 /* check if source STA is associated */
626 if (ni == vap->iv_bss) {
627 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
628 wh, "data", "%s", "unknown src");
629 ieee80211_send_error(ni, wh->i_addr2,
630 IEEE80211_FC0_SUBTYPE_DEAUTH,
631 IEEE80211_REASON_NOT_AUTHED);
632 vap->iv_stats.is_rx_notassoc++;
633 goto err;
634 }
635 if (ni->ni_associd == 0) {
636 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
637 wh, "data", "%s", "unassoc src");
638 IEEE80211_SEND_MGMT(ni,
639 IEEE80211_FC0_SUBTYPE_DISASSOC,
640 IEEE80211_REASON_NOT_ASSOCED);
641 vap->iv_stats.is_rx_notassoc++;
642 goto err;
643 }
644
645 /*
646 * Check for power save state change.
647 * XXX out-of-order A-MPDU frames?
648 */
649 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^
650 (ni->ni_flags & IEEE80211_NODE_PWR_MGT)))
651 ieee80211_node_pwrsave(ni,
652 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT);
653 /*
654 * For 4-address packets handle WDS discovery
655 * notifications. Once a WDS link is setup frames
656 * are just delivered to the WDS vap (see below).
657 */
658 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) {
659 if (!ieee80211_node_is_authorized(ni)) {
660 IEEE80211_DISCARD(vap,
661 IEEE80211_MSG_INPUT |
662 IEEE80211_MSG_WDS, wh,
663 "4-address data",
664 "%s", "unauthorized port");
665 vap->iv_stats.is_rx_unauth++;
666 IEEE80211_NODE_STAT(ni, rx_unauth);
667 goto err;
668 }
669 ieee80211_dwds_discover(ni, m);
670 return type;
671 }
672
673 /*
674 * Handle A-MPDU re-ordering. If the frame is to be
675 * processed directly then ieee80211_ampdu_reorder
676 * will return 0; otherwise it has consumed the mbuf
677 * and we should do nothing more with it.
678 */
679 if ((m->m_flags & M_AMPDU) &&
680 ieee80211_ampdu_reorder(ni, m) != 0) {
681 m = NULL;
682 goto out;
683 }
684 resubmit_ampdu:
685
686 /*
687 * Handle privacy requirements. Note that we
688 * must not be preempted from here until after
689 * we (potentially) call ieee80211_crypto_demic;
690 * otherwise we may violate assumptions in the
691 * crypto cipher modules used to do delayed update
692 * of replay sequence numbers.
693 */
694 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
695 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
696 /*
697 * Discard encrypted frames when privacy is off.
698 */
699 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
700 wh, "WEP", "%s", "PRIVACY off");
701 vap->iv_stats.is_rx_noprivacy++;
702 IEEE80211_NODE_STAT(ni, rx_noprivacy);
703 goto out;
704 }
705 key = ieee80211_crypto_decap(ni, m, hdrspace);
706 if (key == NULL) {
707 /* NB: stats+msgs handled in crypto_decap */
708 IEEE80211_NODE_STAT(ni, rx_wepfail);
709 goto out;
710 }
711 wh = mtod(m, struct ieee80211_frame *);
712 wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
713 } else {
714 /* XXX M_WEP and IEEE80211_F_PRIVACY */
715 key = NULL;
716 }
717
718 /*
719 * Save QoS bits for use below--before we strip the header.
720 */
721 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
722 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
723 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
724 ((struct ieee80211_qosframe *)wh)->i_qos[0];
725 } else
726 qos = 0;
727
728 /*
729 * Next up, any fragmentation.
730 */
731 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
732 m = ieee80211_defrag(ni, m, hdrspace);
733 if (m == NULL) {
734 /* Fragment dropped or frame not complete yet */
735 goto out;
736 }
737 }
738 wh = NULL; /* no longer valid, catch any uses */
739
740 /*
741 * Next strip any MSDU crypto bits.
742 */
743 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
744 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
745 ni->ni_macaddr, "data", "%s", "demic error");
746 vap->iv_stats.is_rx_demicfail++;
747 IEEE80211_NODE_STAT(ni, rx_demicfail);
748 goto out;
749 }
750 /* copy to listener after decrypt */
751 if (ieee80211_radiotap_active_vap(vap))
752 ieee80211_radiotap_rx(vap, m);
753 need_tap = 0;
754 /*
755 * Finally, strip the 802.11 header.
756 */
757 m = ieee80211_decap(vap, m, hdrspace);
758 if (m == NULL) {
759 /* XXX mask bit to check for both */
760 /* don't count Null data frames as errors */
761 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
762 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
763 goto out;
764 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
765 ni->ni_macaddr, "data", "%s", "decap error");
766 vap->iv_stats.is_rx_decap++;
767 IEEE80211_NODE_STAT(ni, rx_decap);
768 goto err;
769 }
770 eh = mtod(m, struct ether_header *);
771 if (!ieee80211_node_is_authorized(ni)) {
772 /*
773 * Deny any non-PAE frames received prior to
774 * authorization. For open/shared-key
775 * authentication the port is mark authorized
776 * after authentication completes. For 802.1x
777 * the port is not marked authorized by the
778 * authenticator until the handshake has completed.
779 */
780 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
781 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
782 eh->ether_shost, "data",
783 "unauthorized port: ether type 0x%x len %u",
784 eh->ether_type, m->m_pkthdr.len);
785 vap->iv_stats.is_rx_unauth++;
786 IEEE80211_NODE_STAT(ni, rx_unauth);
787 goto err;
788 }
789 } else {
790 /*
791 * When denying unencrypted frames, discard
792 * any non-PAE frames received without encryption.
793 */
794 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
795 (key == NULL && (m->m_flags & M_WEP) == 0) &&
796 eh->ether_type != htons(ETHERTYPE_PAE)) {
797 /*
798 * Drop unencrypted frames.
799 */
800 vap->iv_stats.is_rx_unencrypted++;
801 IEEE80211_NODE_STAT(ni, rx_unencrypted);
802 goto out;
803 }
804 }
805 /* XXX require HT? */
806 if (qos & IEEE80211_QOS_AMSDU) {
807 m = ieee80211_decap_amsdu(ni, m);
808 if (m == NULL)
809 return IEEE80211_FC0_TYPE_DATA;
810 } else {
811 #ifdef IEEE80211_SUPPORT_SUPERG
812 m = ieee80211_decap_fastframe(vap, ni, m);
813 if (m == NULL)
814 return IEEE80211_FC0_TYPE_DATA;
815 #endif
816 }
817 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
818 ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
819 else
820 hostap_deliver_data(vap, ni, m);
821 return IEEE80211_FC0_TYPE_DATA;
822
823 case IEEE80211_FC0_TYPE_MGT:
824 vap->iv_stats.is_rx_mgmt++;
825 IEEE80211_NODE_STAT(ni, rx_mgmt);
826 if (dir != IEEE80211_FC1_DIR_NODS) {
827 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
828 wh, "mgt", "incorrect dir 0x%x", dir);
829 vap->iv_stats.is_rx_wrongdir++;
830 goto err;
831 }
832 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
833 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
834 ni->ni_macaddr, "mgt", "too short: len %u",
835 m->m_pkthdr.len);
836 vap->iv_stats.is_rx_tooshort++;
837 goto out;
838 }
839 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
840 /* ensure return frames are unicast */
841 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
842 wh, NULL, "source is multicast: %s",
843 ether_sprintf(wh->i_addr2));
844 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */
845 goto out;
846 }
847 #ifdef IEEE80211_DEBUG
848 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
849 ieee80211_msg_dumppkts(vap)) {
850 if_printf(ifp, "received %s from %s rssi %d\n",
851 ieee80211_mgt_subtype_name[subtype >>
852 IEEE80211_FC0_SUBTYPE_SHIFT],
853 ether_sprintf(wh->i_addr2), rssi);
854 }
855 #endif
856 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
857 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
858 /*
859 * Only shared key auth frames with a challenge
860 * should be encrypted, discard all others.
861 */
862 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
863 wh, NULL,
864 "%s", "WEP set but not permitted");
865 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
866 goto out;
867 }
868 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
869 /*
870 * Discard encrypted frames when privacy is off.
871 */
872 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
873 wh, NULL, "%s", "WEP set but PRIVACY off");
874 vap->iv_stats.is_rx_noprivacy++;
875 goto out;
876 }
877 hdrspace = ieee80211_hdrspace(ic, wh);
878 key = ieee80211_crypto_decap(ni, m, hdrspace);
879 if (key == NULL) {
880 /* NB: stats+msgs handled in crypto_decap */
881 goto out;
882 }
883 wh = mtod(m, struct ieee80211_frame *);
884 wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
885 }
886 /*
887 * Pass the packet to radiotap before calling iv_recv_mgmt().
888 * Otherwise iv_recv_mgmt() might pass another packet to
889 * radiotap, resulting in out of order packet captures.
890 */
891 if (ieee80211_radiotap_active_vap(vap))
892 ieee80211_radiotap_rx(vap, m);
893 need_tap = 0;
894 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
895 goto out;
896
897 case IEEE80211_FC0_TYPE_CTL:
898 vap->iv_stats.is_rx_ctl++;
899 IEEE80211_NODE_STAT(ni, rx_ctrl);
900 vap->iv_recv_ctl(ni, m, subtype);
901 goto out;
902 default:
903 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
904 wh, "bad", "frame type 0x%x", type);
905 /* should not come here */
906 break;
907 }
908 err:
909 ifp->if_ierrors++;
910 out:
911 if (m != NULL) {
912 if (need_tap && ieee80211_radiotap_active_vap(vap))
913 ieee80211_radiotap_rx(vap, m);
914 m_freem(m);
915 }
916 return type;
917 #undef SEQ_LEQ
918 }
919
920 static void
921 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
922 int rssi, int nf, uint16_t seq, uint16_t status)
923 {
924 struct ieee80211vap *vap = ni->ni_vap;
925
926 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
927
928 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
929 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
930 ni->ni_macaddr, "open auth",
931 "bad sta auth mode %u", ni->ni_authmode);
932 vap->iv_stats.is_rx_bad_auth++; /* XXX */
933 /*
934 * Clear any challenge text that may be there if
935 * a previous shared key auth failed and then an
936 * open auth is attempted.
937 */
938 if (ni->ni_challenge != NULL) {
939 free(ni->ni_challenge, M_80211_NODE);
940 ni->ni_challenge = NULL;
941 }
942 /* XXX hack to workaround calling convention */
943 ieee80211_send_error(ni, wh->i_addr2,
944 IEEE80211_FC0_SUBTYPE_AUTH,
945 (seq + 1) | (IEEE80211_STATUS_ALG<<16));
946 return;
947 }
948 if (seq != IEEE80211_AUTH_OPEN_REQUEST) {
949 vap->iv_stats.is_rx_bad_auth++;
950 return;
951 }
952 /* always accept open authentication requests */
953 if (ni == vap->iv_bss) {
954 ni = ieee80211_dup_bss(vap, wh->i_addr2);
955 if (ni == NULL)
956 return;
957 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
958 (void) ieee80211_ref_node(ni);
959 /*
960 * Mark the node as referenced to reflect that it's
961 * reference count has been bumped to insure it remains
962 * after the transaction completes.
963 */
964 ni->ni_flags |= IEEE80211_NODE_AREF;
965 /*
966 * Mark the node as requiring a valid association id
967 * before outbound traffic is permitted.
968 */
969 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
970
971 if (vap->iv_acl != NULL &&
972 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
973 /*
974 * When the ACL policy is set to RADIUS we defer the
975 * authorization to a user agent. Dispatch an event,
976 * a subsequent MLME call will decide the fate of the
977 * station. If the user agent is not present then the
978 * node will be reclaimed due to inactivity.
979 */
980 IEEE80211_NOTE_MAC(vap,
981 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr,
982 "%s", "station authentication defered (radius acl)");
983 ieee80211_notify_node_auth(ni);
984 } else {
985 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
986 IEEE80211_NOTE_MAC(vap,
987 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr,
988 "%s", "station authenticated (open)");
989 /*
990 * When 802.1x is not in use mark the port
991 * authorized at this point so traffic can flow.
992 */
993 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
994 ieee80211_node_authorize(ni);
995 }
996 }
997
998 static void
999 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
1000 uint8_t *frm, uint8_t *efrm, int rssi, int nf,
1001 uint16_t seq, uint16_t status)
1002 {
1003 struct ieee80211vap *vap = ni->ni_vap;
1004 uint8_t *challenge;
1005 int allocbs, estatus;
1006
1007 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
1008
1009 /*
1010 * NB: this can happen as we allow pre-shared key
1011 * authentication to be enabled w/o wep being turned
1012 * on so that configuration of these can be done
1013 * in any order. It may be better to enforce the
1014 * ordering in which case this check would just be
1015 * for sanity/consistency.
1016 */
1017 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1018 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1019 ni->ni_macaddr, "shared key auth",
1020 "%s", " PRIVACY is disabled");
1021 estatus = IEEE80211_STATUS_ALG;
1022 goto bad;
1023 }
1024 /*
1025 * Pre-shared key authentication is evil; accept
1026 * it only if explicitly configured (it is supported
1027 * mainly for compatibility with clients like Mac OS X).
1028 */
1029 if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1030 ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1031 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1032 ni->ni_macaddr, "shared key auth",
1033 "bad sta auth mode %u", ni->ni_authmode);
1034 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1035 estatus = IEEE80211_STATUS_ALG;
1036 goto bad;
1037 }
1038
1039 challenge = NULL;
1040 if (frm + 1 < efrm) {
1041 if ((frm[1] + 2) > (efrm - frm)) {
1042 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1043 ni->ni_macaddr, "shared key auth",
1044 "ie %d/%d too long",
1045 frm[0], (frm[1] + 2) - (efrm - frm));
1046 vap->iv_stats.is_rx_bad_auth++;
1047 estatus = IEEE80211_STATUS_CHALLENGE;
1048 goto bad;
1049 }
1050 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1051 challenge = frm;
1052 frm += frm[1] + 2;
1053 }
1054 switch (seq) {
1055 case IEEE80211_AUTH_SHARED_CHALLENGE:
1056 case IEEE80211_AUTH_SHARED_RESPONSE:
1057 if (challenge == NULL) {
1058 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1059 ni->ni_macaddr, "shared key auth",
1060 "%s", "no challenge");
1061 vap->iv_stats.is_rx_bad_auth++;
1062 estatus = IEEE80211_STATUS_CHALLENGE;
1063 goto bad;
1064 }
1065 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1066 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1067 ni->ni_macaddr, "shared key auth",
1068 "bad challenge len %d", challenge[1]);
1069 vap->iv_stats.is_rx_bad_auth++;
1070 estatus = IEEE80211_STATUS_CHALLENGE;
1071 goto bad;
1072 }
1073 default:
1074 break;
1075 }
1076 switch (seq) {
1077 case IEEE80211_AUTH_SHARED_REQUEST:
1078 if (ni == vap->iv_bss) {
1079 ni = ieee80211_dup_bss(vap, wh->i_addr2);
1080 if (ni == NULL) {
1081 /* NB: no way to return an error */
1082 return;
1083 }
1084 allocbs = 1;
1085 } else {
1086 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
1087 (void) ieee80211_ref_node(ni);
1088 allocbs = 0;
1089 }
1090 /*
1091 * Mark the node as referenced to reflect that it's
1092 * reference count has been bumped to insure it remains
1093 * after the transaction completes.
1094 */
1095 ni->ni_flags |= IEEE80211_NODE_AREF;
1096 /*
1097 * Mark the node as requiring a valid associatio id
1098 * before outbound traffic is permitted.
1099 */
1100 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
1101 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
1102 ni->ni_noise = nf;
1103 if (!ieee80211_alloc_challenge(ni)) {
1104 /* NB: don't return error so they rexmit */
1105 return;
1106 }
1107 get_random_bytes(ni->ni_challenge,
1108 IEEE80211_CHALLENGE_LEN);
1109 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1110 ni, "shared key %sauth request", allocbs ? "" : "re");
1111 /*
1112 * When the ACL policy is set to RADIUS we defer the
1113 * authorization to a user agent. Dispatch an event,
1114 * a subsequent MLME call will decide the fate of the
1115 * station. If the user agent is not present then the
1116 * node will be reclaimed due to inactivity.
1117 */
1118 if (vap->iv_acl != NULL &&
1119 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
1120 IEEE80211_NOTE_MAC(vap,
1121 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL,
1122 ni->ni_macaddr,
1123 "%s", "station authentication defered (radius acl)");
1124 ieee80211_notify_node_auth(ni);
1125 return;
1126 }
1127 break;
1128 case IEEE80211_AUTH_SHARED_RESPONSE:
1129 if (ni == vap->iv_bss) {
1130 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1131 ni->ni_macaddr, "shared key response",
1132 "%s", "unknown station");
1133 /* NB: don't send a response */
1134 return;
1135 }
1136 if (ni->ni_challenge == NULL) {
1137 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1138 ni->ni_macaddr, "shared key response",
1139 "%s", "no challenge recorded");
1140 vap->iv_stats.is_rx_bad_auth++;
1141 estatus = IEEE80211_STATUS_CHALLENGE;
1142 goto bad;
1143 }
1144 if (memcmp(ni->ni_challenge, &challenge[2],
1145 challenge[1]) != 0) {
1146 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1147 ni->ni_macaddr, "shared key response",
1148 "%s", "challenge mismatch");
1149 vap->iv_stats.is_rx_auth_fail++;
1150 estatus = IEEE80211_STATUS_CHALLENGE;
1151 goto bad;
1152 }
1153 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1154 ni, "%s", "station authenticated (shared key)");
1155 ieee80211_node_authorize(ni);
1156 break;
1157 default:
1158 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1159 ni->ni_macaddr, "shared key auth",
1160 "bad seq %d", seq);
1161 vap->iv_stats.is_rx_bad_auth++;
1162 estatus = IEEE80211_STATUS_SEQUENCE;
1163 goto bad;
1164 }
1165 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1166 return;
1167 bad:
1168 /*
1169 * Send an error response; but only when operating as an AP.
1170 */
1171 /* XXX hack to workaround calling convention */
1172 ieee80211_send_error(ni, wh->i_addr2,
1173 IEEE80211_FC0_SUBTYPE_AUTH,
1174 (seq + 1) | (estatus<<16));
1175 }
1176
1177 /*
1178 * Convert a WPA cipher selector OUI to an internal
1179 * cipher algorithm. Where appropriate we also
1180 * record any key length.
1181 */
1182 static int
1183 wpa_cipher(const uint8_t *sel, uint8_t *keylen)
1184 {
1185 #define WPA_SEL(x) (((x)<<24)|WPA_OUI)
1186 uint32_t w = LE_READ_4(sel);
1187
1188 switch (w) {
1189 case WPA_SEL(WPA_CSE_NULL):
1190 return IEEE80211_CIPHER_NONE;
1191 case WPA_SEL(WPA_CSE_WEP40):
1192 if (keylen)
1193 *keylen = 40 / NBBY;
1194 return IEEE80211_CIPHER_WEP;
1195 case WPA_SEL(WPA_CSE_WEP104):
1196 if (keylen)
1197 *keylen = 104 / NBBY;
1198 return IEEE80211_CIPHER_WEP;
1199 case WPA_SEL(WPA_CSE_TKIP):
1200 return IEEE80211_CIPHER_TKIP;
1201 case WPA_SEL(WPA_CSE_CCMP):
1202 return IEEE80211_CIPHER_AES_CCM;
1203 }
1204 return 32; /* NB: so 1<< is discarded */
1205 #undef WPA_SEL
1206 }
1207
1208 /*
1209 * Convert a WPA key management/authentication algorithm
1210 * to an internal code.
1211 */
1212 static int
1213 wpa_keymgmt(const uint8_t *sel)
1214 {
1215 #define WPA_SEL(x) (((x)<<24)|WPA_OUI)
1216 uint32_t w = LE_READ_4(sel);
1217
1218 switch (w) {
1219 case WPA_SEL(WPA_ASE_8021X_UNSPEC):
1220 return WPA_ASE_8021X_UNSPEC;
1221 case WPA_SEL(WPA_ASE_8021X_PSK):
1222 return WPA_ASE_8021X_PSK;
1223 case WPA_SEL(WPA_ASE_NONE):
1224 return WPA_ASE_NONE;
1225 }
1226 return 0; /* NB: so is discarded */
1227 #undef WPA_SEL
1228 }
1229
1230 /*
1231 * Parse a WPA information element to collect parameters.
1232 * Note that we do not validate security parameters; that
1233 * is handled by the authenticator; the parsing done here
1234 * is just for internal use in making operational decisions.
1235 */
1236 static int
1237 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm,
1238 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1239 {
1240 uint8_t len = frm[1];
1241 uint32_t w;
1242 int n;
1243
1244 /*
1245 * Check the length once for fixed parts: OUI, type,
1246 * version, mcast cipher, and 2 selector counts.
1247 * Other, variable-length data, must be checked separately.
1248 */
1249 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) {
1250 IEEE80211_DISCARD_IE(vap,
1251 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1252 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags);
1253 return IEEE80211_REASON_IE_INVALID;
1254 }
1255 if (len < 14) {
1256 IEEE80211_DISCARD_IE(vap,
1257 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1258 wh, "WPA", "too short, len %u", len);
1259 return IEEE80211_REASON_IE_INVALID;
1260 }
1261 frm += 6, len -= 4; /* NB: len is payload only */
1262 /* NB: iswpaoui already validated the OUI and type */
1263 w = LE_READ_2(frm);
1264 if (w != WPA_VERSION) {
1265 IEEE80211_DISCARD_IE(vap,
1266 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1267 wh, "WPA", "bad version %u", w);
1268 return IEEE80211_REASON_IE_INVALID;
1269 }
1270 frm += 2, len -= 2;
1271
1272 memset(rsn, 0, sizeof(*rsn));
1273
1274 /* multicast/group cipher */
1275 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen);
1276 frm += 4, len -= 4;
1277
1278 /* unicast ciphers */
1279 n = LE_READ_2(frm);
1280 frm += 2, len -= 2;
1281 if (len < n*4+2) {
1282 IEEE80211_DISCARD_IE(vap,
1283 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1284 wh, "WPA", "ucast cipher data too short; len %u, n %u",
1285 len, n);
1286 return IEEE80211_REASON_IE_INVALID;
1287 }
1288 w = 0;
1289 for (; n > 0; n--) {
1290 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen);
1291 frm += 4, len -= 4;
1292 }
1293 if (w & (1<<IEEE80211_CIPHER_TKIP))
1294 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1295 else
1296 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1297
1298 /* key management algorithms */
1299 n = LE_READ_2(frm);
1300 frm += 2, len -= 2;
1301 if (len < n*4) {
1302 IEEE80211_DISCARD_IE(vap,
1303 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1304 wh, "WPA", "key mgmt alg data too short; len %u, n %u",
1305 len, n);
1306 return IEEE80211_REASON_IE_INVALID;
1307 }
1308 w = 0;
1309 for (; n > 0; n--) {
1310 w |= wpa_keymgmt(frm);
1311 frm += 4, len -= 4;
1312 }
1313 if (w & WPA_ASE_8021X_UNSPEC)
1314 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC;
1315 else
1316 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
1317
1318 if (len > 2) /* optional capabilities */
1319 rsn->rsn_caps = LE_READ_2(frm);
1320
1321 return 0;
1322 }
1323
1324 /*
1325 * Convert an RSN cipher selector OUI to an internal
1326 * cipher algorithm. Where appropriate we also
1327 * record any key length.
1328 */
1329 static int
1330 rsn_cipher(const uint8_t *sel, uint8_t *keylen)
1331 {
1332 #define RSN_SEL(x) (((x)<<24)|RSN_OUI)
1333 uint32_t w = LE_READ_4(sel);
1334
1335 switch (w) {
1336 case RSN_SEL(RSN_CSE_NULL):
1337 return IEEE80211_CIPHER_NONE;
1338 case RSN_SEL(RSN_CSE_WEP40):
1339 if (keylen)
1340 *keylen = 40 / NBBY;
1341 return IEEE80211_CIPHER_WEP;
1342 case RSN_SEL(RSN_CSE_WEP104):
1343 if (keylen)
1344 *keylen = 104 / NBBY;
1345 return IEEE80211_CIPHER_WEP;
1346 case RSN_SEL(RSN_CSE_TKIP):
1347 return IEEE80211_CIPHER_TKIP;
1348 case RSN_SEL(RSN_CSE_CCMP):
1349 return IEEE80211_CIPHER_AES_CCM;
1350 case RSN_SEL(RSN_CSE_WRAP):
1351 return IEEE80211_CIPHER_AES_OCB;
1352 }
1353 return 32; /* NB: so 1<< is discarded */
1354 #undef WPA_SEL
1355 }
1356
1357 /*
1358 * Convert an RSN key management/authentication algorithm
1359 * to an internal code.
1360 */
1361 static int
1362 rsn_keymgmt(const uint8_t *sel)
1363 {
1364 #define RSN_SEL(x) (((x)<<24)|RSN_OUI)
1365 uint32_t w = LE_READ_4(sel);
1366
1367 switch (w) {
1368 case RSN_SEL(RSN_ASE_8021X_UNSPEC):
1369 return RSN_ASE_8021X_UNSPEC;
1370 case RSN_SEL(RSN_ASE_8021X_PSK):
1371 return RSN_ASE_8021X_PSK;
1372 case RSN_SEL(RSN_ASE_NONE):
1373 return RSN_ASE_NONE;
1374 }
1375 return 0; /* NB: so is discarded */
1376 #undef RSN_SEL
1377 }
1378
1379 /*
1380 * Parse a WPA/RSN information element to collect parameters
1381 * and validate the parameters against what has been
1382 * configured for the system.
1383 */
1384 static int
1385 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm,
1386 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1387 {
1388 uint8_t len = frm[1];
1389 uint32_t w;
1390 int n;
1391
1392 /*
1393 * Check the length once for fixed parts:
1394 * version, mcast cipher, and 2 selector counts.
1395 * Other, variable-length data, must be checked separately.
1396 */
1397 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) {
1398 IEEE80211_DISCARD_IE(vap,
1399 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1400 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags);
1401 return IEEE80211_REASON_IE_INVALID;
1402 }
1403 if (len < 10) {
1404 IEEE80211_DISCARD_IE(vap,
1405 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1406 wh, "RSN", "too short, len %u", len);
1407 return IEEE80211_REASON_IE_INVALID;
1408 }
1409 frm += 2;
1410 w = LE_READ_2(frm);
1411 if (w != RSN_VERSION) {
1412 IEEE80211_DISCARD_IE(vap,
1413 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1414 wh, "RSN", "bad version %u", w);
1415 return IEEE80211_REASON_IE_INVALID;
1416 }
1417 frm += 2, len -= 2;
1418
1419 memset(rsn, 0, sizeof(*rsn));
1420
1421 /* multicast/group cipher */
1422 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen);
1423 frm += 4, len -= 4;
1424
1425 /* unicast ciphers */
1426 n = LE_READ_2(frm);
1427 frm += 2, len -= 2;
1428 if (len < n*4+2) {
1429 IEEE80211_DISCARD_IE(vap,
1430 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1431 wh, "RSN", "ucast cipher data too short; len %u, n %u",
1432 len, n);
1433 return IEEE80211_REASON_IE_INVALID;
1434 }
1435 w = 0;
1436 for (; n > 0; n--) {
1437 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen);
1438 frm += 4, len -= 4;
1439 }
1440 if (w & (1<<IEEE80211_CIPHER_TKIP))
1441 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1442 else
1443 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1444
1445 /* key management algorithms */
1446 n = LE_READ_2(frm);
1447 frm += 2, len -= 2;
1448 if (len < n*4) {
1449 IEEE80211_DISCARD_IE(vap,
1450 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1451 wh, "RSN", "key mgmt alg data too short; len %u, n %u",
1452 len, n);
1453 return IEEE80211_REASON_IE_INVALID;
1454 }
1455 w = 0;
1456 for (; n > 0; n--) {
1457 w |= rsn_keymgmt(frm);
1458 frm += 4, len -= 4;
1459 }
1460 if (w & RSN_ASE_8021X_UNSPEC)
1461 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC;
1462 else
1463 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK;
1464
1465 /* optional RSN capabilities */
1466 if (len > 2)
1467 rsn->rsn_caps = LE_READ_2(frm);
1468 /* XXXPMKID */
1469
1470 return 0;
1471 }
1472
1473 /*
1474 * WPA/802.11i assocation request processing.
1475 */
1476 static int
1477 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms,
1478 const struct ieee80211_frame *wh, const uint8_t *wpa,
1479 const uint8_t *rsn, uint16_t capinfo)
1480 {
1481 struct ieee80211vap *vap = ni->ni_vap;
1482 uint8_t reason;
1483 int badwparsn;
1484
1485 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN);
1486 if (wpa == NULL && rsn == NULL) {
1487 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) {
1488 /*
1489 * W-Fi Protected Setup (WPS) permits
1490 * clients to associate and pass EAPOL frames
1491 * to establish initial credentials.
1492 */
1493 ni->ni_flags |= IEEE80211_NODE_WPS;
1494 return 1;
1495 }
1496 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) &&
1497 (capinfo & IEEE80211_CAPINFO_PRIVACY)) {
1498 /*
1499 * Transitional Security Network. Permits clients
1500 * to associate and use WEP while WPA is configured.
1501 */
1502 ni->ni_flags |= IEEE80211_NODE_TSN;
1503 return 1;
1504 }
1505 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1506 wh, NULL, "%s", "no WPA/RSN IE in association request");
1507 vap->iv_stats.is_rx_assoc_badwpaie++;
1508 reason = IEEE80211_REASON_IE_INVALID;
1509 goto bad;
1510 }
1511 /* assert right association security credentials */
1512 badwparsn = 0; /* NB: to silence compiler */
1513 switch (vap->iv_flags & IEEE80211_F_WPA) {
1514 case IEEE80211_F_WPA1:
1515 badwparsn = (wpa == NULL);
1516 break;
1517 case IEEE80211_F_WPA2:
1518 badwparsn = (rsn == NULL);
1519 break;
1520 case IEEE80211_F_WPA1|IEEE80211_F_WPA2:
1521 badwparsn = (wpa == NULL && rsn == NULL);
1522 break;
1523 }
1524 if (badwparsn) {
1525 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1526 wh, NULL,
1527 "%s", "missing WPA/RSN IE in association request");
1528 vap->iv_stats.is_rx_assoc_badwpaie++;
1529 reason = IEEE80211_REASON_IE_INVALID;
1530 goto bad;
1531 }
1532 /*
1533 * Parse WPA/RSN information element.
1534 */
1535 if (wpa != NULL)
1536 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh);
1537 else
1538 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh);
1539 if (reason != 0) {
1540 /* XXX distinguish WPA/RSN? */
1541 vap->iv_stats.is_rx_assoc_badwpaie++;
1542 goto bad;
1543 }
1544 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni,
1545 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x",
1546 wpa != NULL ? "WPA" : "RSN",
1547 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen,
1548 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen,
1549 rsnparms->rsn_keymgmt, rsnparms->rsn_caps);
1550
1551 return 1;
1552 bad:
1553 ieee80211_node_deauth(ni, reason);
1554 return 0;
1555 }
1556
1557 /* XXX find a better place for definition */
1558 struct l2_update_frame {
1559 struct ether_header eh;
1560 uint8_t dsap;
1561 uint8_t ssap;
1562 uint8_t control;
1563 uint8_t xid[3];
1564 } __packed;
1565
1566 /*
1567 * Deliver a TGf L2UF frame on behalf of a station.
1568 * This primes any bridge when the station is roaming
1569 * between ap's on the same wired network.
1570 */
1571 static void
1572 ieee80211_deliver_l2uf(struct ieee80211_node *ni)
1573 {
1574 struct ieee80211vap *vap = ni->ni_vap;
1575 struct ifnet *ifp = vap->iv_ifp;
1576 struct mbuf *m;
1577 struct l2_update_frame *l2uf;
1578 struct ether_header *eh;
1579
1580 m = m_gethdr(M_NOWAIT, MT_DATA);
1581 if (m == NULL) {
1582 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1583 "%s", "no mbuf for l2uf frame");
1584 vap->iv_stats.is_rx_nobuf++; /* XXX not right */
1585 return;
1586 }
1587 l2uf = mtod(m, struct l2_update_frame *);
1588 eh = &l2uf->eh;
1589 /* dst: Broadcast address */
1590 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr);
1591 /* src: associated STA */
1592 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr);
1593 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh));
1594
1595 l2uf->dsap = 0;
1596 l2uf->ssap = 0;
1597 l2uf->control = 0xf5;
1598 l2uf->xid[0] = 0x81;
1599 l2uf->xid[1] = 0x80;
1600 l2uf->xid[2] = 0x00;
1601
1602 m->m_pkthdr.len = m->m_len = sizeof(*l2uf);
1603 hostap_deliver_data(vap, ni, m);
1604 }
1605
1606 static void
1607 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1608 int reassoc, int resp, const char *tag, int rate)
1609 {
1610 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1611 "deny %s request, %s rate set mismatch, rate/MCS %d",
1612 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL);
1613 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE);
1614 ieee80211_node_leave(ni);
1615 }
1616
1617 static void
1618 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1619 int reassoc, int resp, const char *tag, int capinfo)
1620 {
1621 struct ieee80211vap *vap = ni->ni_vap;
1622
1623 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1624 "deny %s request, %s mismatch 0x%x",
1625 reassoc ? "reassoc" : "assoc", tag, capinfo);
1626 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO);
1627 ieee80211_node_leave(ni);
1628 vap->iv_stats.is_rx_assoc_capmismatch++;
1629 }
1630
1631 static void
1632 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1633 int reassoc, int resp)
1634 {
1635 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1636 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc");
1637 /* XXX no better code */
1638 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS);
1639 ieee80211_node_leave(ni);
1640 }
1641
1642 static void
1643 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1644 int algo, int seq, int status)
1645 {
1646 struct ieee80211vap *vap = ni->ni_vap;
1647
1648 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1649 wh, NULL, "unsupported alg %d", algo);
1650 vap->iv_stats.is_rx_auth_unsupported++;
1651 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH,
1652 seq | (status << 16));
1653 }
1654
1655 static __inline int
1656 ishtmixed(const uint8_t *ie)
1657 {
1658 const struct ieee80211_ie_htinfo *ht =
1659 (const struct ieee80211_ie_htinfo *) ie;
1660 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) ==
1661 IEEE80211_HTINFO_OPMODE_MIXED;
1662 }
1663
1664 static int
1665 is11bclient(const uint8_t *rates, const uint8_t *xrates)
1666 {
1667 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
1668 int i;
1669
1670 /* NB: the 11b clients we care about will not have xrates */
1671 if (xrates != NULL || rates == NULL)
1672 return 0;
1673 for (i = 0; i < rates[1]; i++) {
1674 int r = rates[2+i] & IEEE80211_RATE_VAL;
1675 if (r > 2*11 || ((1<<r) & brates) == 0)
1676 return 0;
1677 }
1678 return 1;
1679 }
1680
1681 static void
1682 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1683 int subtype, int rssi, int nf)
1684 {
1685 struct ieee80211vap *vap = ni->ni_vap;
1686 struct ieee80211com *ic = ni->ni_ic;
1687 struct ieee80211_frame *wh;
1688 uint8_t *frm, *efrm, *sfrm;
1689 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap;
1690 int reassoc, resp;
1691 uint8_t rate;
1692
1693 wh = mtod(m0, struct ieee80211_frame *);
1694 frm = (uint8_t *)&wh[1];
1695 efrm = mtod(m0, uint8_t *) + m0->m_len;
1696 switch (subtype) {
1697 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1698 case IEEE80211_FC0_SUBTYPE_BEACON: {
1699 struct ieee80211_scanparams scan;
1700 /*
1701 * We process beacon/probe response frames when scanning;
1702 * otherwise we check beacon frames for overlapping non-ERP
1703 * BSS in 11g and/or overlapping legacy BSS when in HT.
1704 */
1705 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 &&
1706 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) {
1707 vap->iv_stats.is_rx_mgtdiscard++;
1708 return;
1709 }
1710 /* NB: accept off-channel frames */
1711 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN)
1712 return;
1713 /*
1714 * Count frame now that we know it's to be processed.
1715 */
1716 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1717 vap->iv_stats.is_rx_beacon++; /* XXX remove */
1718 IEEE80211_NODE_STAT(ni, rx_beacons);
1719 } else
1720 IEEE80211_NODE_STAT(ni, rx_proberesp);
1721 /*
1722 * If scanning, just pass information to the scan module.
1723 */
1724 if (ic->ic_flags & IEEE80211_F_SCAN) {
1725 if (scan.status == 0 && /* NB: on channel */
1726 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) {
1727 /*
1728 * Actively scanning a channel marked passive;
1729 * send a probe request now that we know there
1730 * is 802.11 traffic present.
1731 *
1732 * XXX check if the beacon we recv'd gives
1733 * us what we need and suppress the probe req
1734 */
1735 ieee80211_probe_curchan(vap, 1);
1736 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1737 }
1738 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
1739 return;
1740 }
1741 /*
1742 * Check beacon for overlapping bss w/ non ERP stations.
1743 * If we detect one and protection is configured but not
1744 * enabled, enable it and start a timer that'll bring us
1745 * out if we stop seeing the bss.
1746 */
1747 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1748 scan.status == 0 && /* NB: on-channel */
1749 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/
1750 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) {
1751 ic->ic_lastnonerp = ticks;
1752 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR;
1753 if (ic->ic_protmode != IEEE80211_PROT_NONE &&
1754 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) {
1755 IEEE80211_NOTE_FRAME(vap,
1756 IEEE80211_MSG_ASSOC, wh,
1757 "non-ERP present on channel %d "
1758 "(saw erp 0x%x from channel %d), "
1759 "enable use of protection",
1760 ic->ic_curchan->ic_ieee,
1761 scan.erp, scan.chan);
1762 ic->ic_flags |= IEEE80211_F_USEPROT;
1763 ieee80211_notify_erp(ic);
1764 }
1765 }
1766 /*
1767 * Check beacon for non-HT station on HT channel
1768 * and update HT BSS occupancy as appropriate.
1769 */
1770 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) {
1771 if (scan.status & IEEE80211_BPARSE_OFFCHAN) {
1772 /*
1773 * Off control channel; only check frames
1774 * that come in the extension channel when
1775 * operating w/ HT40.
1776 */
1777 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan))
1778 break;
1779 if (scan.chan != ic->ic_curchan->ic_extieee)
1780 break;
1781 }
1782 if (scan.htinfo == NULL) {
1783 ieee80211_htprot_update(ic,
1784 IEEE80211_HTINFO_OPMODE_PROTOPT |
1785 IEEE80211_HTINFO_NONHT_PRESENT);
1786 } else if (ishtmixed(scan.htinfo)) {
1787 /* XXX? take NONHT_PRESENT from beacon? */
1788 ieee80211_htprot_update(ic,
1789 IEEE80211_HTINFO_OPMODE_MIXED |
1790 IEEE80211_HTINFO_NONHT_PRESENT);
1791 }
1792 }
1793 break;
1794 }
1795
1796 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1797 if (vap->iv_state != IEEE80211_S_RUN) {
1798 vap->iv_stats.is_rx_mgtdiscard++;
1799 return;
1800 }
1801 /*
1802 * prreq frame format
1803 * [tlv] ssid
1804 * [tlv] supported rates
1805 * [tlv] extended supported rates
1806 */
1807 ssid = rates = xrates = NULL;
1808 sfrm = frm;
1809 while (efrm - frm > 1) {
1810 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1811 switch (*frm) {
1812 case IEEE80211_ELEMID_SSID:
1813 ssid = frm;
1814 break;
1815 case IEEE80211_ELEMID_RATES:
1816 rates = frm;
1817 break;
1818 case IEEE80211_ELEMID_XRATES:
1819 xrates = frm;
1820 break;
1821 }
1822 frm += frm[1] + 2;
1823 }
1824 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1825 if (xrates != NULL)
1826 IEEE80211_VERIFY_ELEMENT(xrates,
1827 IEEE80211_RATE_MAXSIZE - rates[1], return);
1828 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
1829 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
1830 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
1831 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1832 wh, NULL,
1833 "%s", "no ssid with ssid suppression enabled");
1834 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
1835 return;
1836 }
1837
1838 /* XXX find a better class or define it's own */
1839 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
1840 "%s", "recv probe req");
1841 /*
1842 * Some legacy 11b clients cannot hack a complete
1843 * probe response frame. When the request includes
1844 * only a bare-bones rate set, communicate this to
1845 * the transmit side.
1846 */
1847 ieee80211_send_proberesp(vap, wh->i_addr2,
1848 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
1849 break;
1850
1851 case IEEE80211_FC0_SUBTYPE_AUTH: {
1852 uint16_t algo, seq, status;
1853
1854 if (vap->iv_state != IEEE80211_S_RUN) {
1855 vap->iv_stats.is_rx_mgtdiscard++;
1856 return;
1857 }
1858 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1859 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1860 wh, NULL, "%s", "wrong bssid");
1861 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/
1862 return;
1863 }
1864 /*
1865 * auth frame format
1866 * [2] algorithm
1867 * [2] sequence
1868 * [2] status
1869 * [tlv*] challenge
1870 */
1871 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1872 algo = le16toh(*(uint16_t *)frm);
1873 seq = le16toh(*(uint16_t *)(frm + 2));
1874 status = le16toh(*(uint16_t *)(frm + 4));
1875 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1876 "recv auth frame with algorithm %d seq %d", algo, seq);
1877 /*
1878 * Consult the ACL policy module if setup.
1879 */
1880 if (vap->iv_acl != NULL &&
1881 !vap->iv_acl->iac_check(vap, wh->i_addr2)) {
1882 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1883 wh, NULL, "%s", "disallowed by ACL");
1884 vap->iv_stats.is_rx_acl++;
1885 ieee80211_send_error(ni, wh->i_addr2,
1886 IEEE80211_FC0_SUBTYPE_AUTH,
1887 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16));
1888 return;
1889 }
1890 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1891 IEEE80211_DISCARD(vap,
1892 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1893 wh, NULL, "%s", "TKIP countermeasures enabled");
1894 vap->iv_stats.is_rx_auth_countermeasures++;
1895 ieee80211_send_error(ni, wh->i_addr2,
1896 IEEE80211_FC0_SUBTYPE_AUTH,
1897 IEEE80211_REASON_MIC_FAILURE);
1898 return;
1899 }
1900 if (algo == IEEE80211_AUTH_ALG_SHARED)
1901 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1902 seq, status);
1903 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1904 hostap_auth_open(ni, wh, rssi, nf, seq, status);
1905 else if (algo == IEEE80211_AUTH_ALG_LEAP) {
1906 authalgreject(ni, wh, algo,
1907 seq+1, IEEE80211_STATUS_ALG);
1908 return;
1909 } else {
1910 /*
1911 * We assume that an unknown algorithm is the result
1912 * of a decryption failure on a shared key auth frame;
1913 * return a status code appropriate for that instead
1914 * of IEEE80211_STATUS_ALG.
1915 *
1916 * NB: a seq# of 4 is intentional; the decrypted
1917 * frame likely has a bogus seq value.
1918 */
1919 authalgreject(ni, wh, algo,
1920 4, IEEE80211_STATUS_CHALLENGE);
1921 return;
1922 }
1923 break;
1924 }
1925
1926 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1927 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
1928 uint16_t capinfo, lintval;
1929 struct ieee80211_rsnparms rsnparms;
1930
1931 if (vap->iv_state != IEEE80211_S_RUN) {
1932 vap->iv_stats.is_rx_mgtdiscard++;
1933 return;
1934 }
1935 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1936 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1937 wh, NULL, "%s", "wrong bssid");
1938 vap->iv_stats.is_rx_assoc_bss++;
1939 return;
1940 }
1941 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
1942 reassoc = 1;
1943 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
1944 } else {
1945 reassoc = 0;
1946 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
1947 }
1948 if (ni == vap->iv_bss) {
1949 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1950 "deny %s request, sta not authenticated",
1951 reassoc ? "reassoc" : "assoc");
1952 ieee80211_send_error(ni, wh->i_addr2,
1953 IEEE80211_FC0_SUBTYPE_DEAUTH,
1954 IEEE80211_REASON_ASSOC_NOT_AUTHED);
1955 vap->iv_stats.is_rx_assoc_notauth++;
1956 return;
1957 }
1958
1959 /*
1960 * asreq frame format
1961 * [2] capability information
1962 * [2] listen interval
1963 * [6*] current AP address (reassoc only)
1964 * [tlv] ssid
1965 * [tlv] supported rates
1966 * [tlv] extended supported rates
1967 * [tlv] WPA or RSN
1968 * [tlv] HT capabilities
1969 * [tlv] Atheros capabilities
1970 */
1971 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return);
1972 capinfo = le16toh(*(uint16_t *)frm); frm += 2;
1973 lintval = le16toh(*(uint16_t *)frm); frm += 2;
1974 if (reassoc)
1975 frm += 6; /* ignore current AP info */
1976 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL;
1977 sfrm = frm;
1978 while (efrm - frm > 1) {
1979 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1980 switch (*frm) {
1981 case IEEE80211_ELEMID_SSID:
1982 ssid = frm;
1983 break;
1984 case IEEE80211_ELEMID_RATES:
1985 rates = frm;
1986 break;
1987 case IEEE80211_ELEMID_XRATES:
1988 xrates = frm;
1989 break;
1990 case IEEE80211_ELEMID_RSN:
1991 rsn = frm;
1992 break;
1993 case IEEE80211_ELEMID_HTCAP:
1994 htcap = frm;
1995 break;
1996 case IEEE80211_ELEMID_VENDOR:
1997 if (iswpaoui(frm))
1998 wpa = frm;
1999 else if (iswmeinfo(frm))
2000 wme = frm;
2001 #ifdef IEEE80211_SUPPORT_SUPERG
2002 else if (isatherosoui(frm))
2003 ath = frm;
2004 #endif
2005 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
2006 if (ishtcapoui(frm) && htcap == NULL)
2007 htcap = frm;
2008 }
2009 break;
2010 }
2011 frm += frm[1] + 2;
2012 }
2013 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
2014 if (xrates != NULL)
2015 IEEE80211_VERIFY_ELEMENT(xrates,
2016 IEEE80211_RATE_MAXSIZE - rates[1], return);
2017 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
2018 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
2019 if (htcap != NULL) {
2020 IEEE80211_VERIFY_LENGTH(htcap[1],
2021 htcap[0] == IEEE80211_ELEMID_VENDOR ?
2022 4 + sizeof(struct ieee80211_ie_htcap)-2 :
2023 sizeof(struct ieee80211_ie_htcap)-2,
2024 return); /* XXX just NULL out? */
2025 }
2026
2027 if ((vap->iv_flags & IEEE80211_F_WPA) &&
2028 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo))
2029 return;
2030 /* discard challenge after association */
2031 if (ni->ni_challenge != NULL) {
2032 free(ni->ni_challenge, M_80211_NODE);
2033 ni->ni_challenge = NULL;
2034 }
2035 /* NB: 802.11 spec says to ignore station's privacy bit */
2036 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
2037 capinfomismatch(ni, wh, reassoc, resp,
2038 "capability", capinfo);
2039 return;
2040 }
2041 /*
2042 * Disallow re-associate w/ invalid slot time setting.
2043 */
2044 if (ni->ni_associd != 0 &&
2045 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2046 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
2047 capinfomismatch(ni, wh, reassoc, resp,
2048 "slot time", capinfo);
2049 return;
2050 }
2051 rate = ieee80211_setup_rates(ni, rates, xrates,
2052 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
2053 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
2054 if (rate & IEEE80211_RATE_BASIC) {
2055 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate);
2056 vap->iv_stats.is_rx_assoc_norate++;
2057 return;
2058 }
2059 /*
2060 * If constrained to 11g-only stations reject an
2061 * 11b-only station. We cheat a bit here by looking
2062 * at the max negotiated xmit rate and assuming anyone
2063 * with a best rate <24Mb/s is an 11b station.
2064 */
2065 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) {
2066 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate);
2067 vap->iv_stats.is_rx_assoc_norate++;
2068 return;
2069 }
2070 /*
2071 * Do HT rate set handling and setup HT node state.
2072 */
2073 ni->ni_chan = vap->iv_bss->ni_chan;
2074 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2075 rate = ieee80211_setup_htrates(ni, htcap,
2076 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO |
2077 IEEE80211_F_DOBRS);
2078 if (rate & IEEE80211_RATE_BASIC) {
2079 ratesetmismatch(ni, wh, reassoc, resp,
2080 "HT", rate);
2081 vap->iv_stats.is_ht_assoc_norate++;
2082 return;
2083 }
2084 ieee80211_ht_node_init(ni);
2085 ieee80211_ht_updatehtcap(ni, htcap);
2086 } else if (ni->ni_flags & IEEE80211_NODE_HT)
2087 ieee80211_ht_node_cleanup(ni);
2088 #ifdef IEEE80211_SUPPORT_SUPERG
2089 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH)
2090 ieee80211_ff_node_cleanup(ni);
2091 #endif
2092 /*
2093 * Allow AMPDU operation only with unencrypted traffic
2094 * or AES-CCM; the 11n spec only specifies these ciphers
2095 * so permitting any others is undefined and can lead
2096 * to interoperability problems.
2097 */
2098 if ((ni->ni_flags & IEEE80211_NODE_HT) &&
2099 (((vap->iv_flags & IEEE80211_F_WPA) &&
2100 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) ||
2101 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) {
2102 IEEE80211_NOTE(vap,
2103 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
2104 "disallow HT use because WEP or TKIP requested, "
2105 "capinfo 0x%x ucastcipher %d", capinfo,
2106 rsnparms.rsn_ucastcipher);
2107 ieee80211_ht_node_cleanup(ni);
2108 vap->iv_stats.is_ht_assoc_downgrade++;
2109 }
2110 /*
2111 * If constrained to 11n-only stations reject legacy stations.
2112 */
2113 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) &&
2114 (ni->ni_flags & IEEE80211_NODE_HT) == 0) {
2115 htcapmismatch(ni, wh, reassoc, resp);
2116 vap->iv_stats.is_ht_assoc_nohtcap++;
2117 return;
2118 }
2119 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
2120 ni->ni_noise = nf;
2121 ni->ni_intval = lintval;
2122 ni->ni_capinfo = capinfo;
2123 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell;
2124 ni->ni_fhindex = vap->iv_bss->ni_fhindex;
2125 /*
2126 * Store the IEs.
2127 * XXX maybe better to just expand
2128 */
2129 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) {
2130 #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off)
2131 if (wpa != NULL)
2132 setie(wpa_ie, wpa - sfrm);
2133 if (rsn != NULL)
2134 setie(rsn_ie, rsn - sfrm);
2135 if (htcap != NULL)
2136 setie(htcap_ie, htcap - sfrm);
2137 if (wme != NULL) {
2138 setie(wme_ie, wme - sfrm);
2139 /*
2140 * Mark node as capable of QoS.
2141 */
2142 ni->ni_flags |= IEEE80211_NODE_QOS;
2143 } else
2144 ni->ni_flags &= ~IEEE80211_NODE_QOS;
2145 #ifdef IEEE80211_SUPPORT_SUPERG
2146 if (ath != NULL) {
2147 setie(ath_ie, ath - sfrm);
2148 /*
2149 * Parse ATH station parameters.
2150 */
2151 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
2152 } else
2153 #endif
2154 ni->ni_ath_flags = 0;
2155 #undef setie
2156 } else {
2157 ni->ni_flags &= ~IEEE80211_NODE_QOS;
2158 ni->ni_ath_flags = 0;
2159 }
2160 ieee80211_node_join(ni, resp);
2161 ieee80211_deliver_l2uf(ni);
2162 break;
2163 }
2164
2165 case IEEE80211_FC0_SUBTYPE_DEAUTH:
2166 case IEEE80211_FC0_SUBTYPE_DISASSOC: {
2167 uint16_t reason;
2168
2169 if (vap->iv_state != IEEE80211_S_RUN ||
2170 /* NB: can happen when in promiscuous mode */
2171 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
2172 vap->iv_stats.is_rx_mgtdiscard++;
2173 break;
2174 }
2175 /*
2176 * deauth/disassoc frame format
2177 * [2] reason
2178 */
2179 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
2180 reason = le16toh(*(uint16_t *)frm);
2181 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) {
2182 vap->iv_stats.is_rx_deauth++;
2183 IEEE80211_NODE_STAT(ni, rx_deauth);
2184 } else {
2185 vap->iv_stats.is_rx_disassoc++;
2186 IEEE80211_NODE_STAT(ni, rx_disassoc);
2187 }
2188 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2189 "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >>
2190 IEEE80211_FC0_SUBTYPE_SHIFT], reason);
2191 if (ni != vap->iv_bss)
2192 ieee80211_node_leave(ni);
2193 break;
2194 }
2195
2196 case IEEE80211_FC0_SUBTYPE_ACTION:
2197 if (vap->iv_state == IEEE80211_S_RUN) {
2198 if (ieee80211_parse_action(ni, m0) == 0)
2199 ic->ic_recv_action(ni, wh, frm, efrm);
2200 } else
2201 vap->iv_stats.is_rx_mgtdiscard++;
2202 break;
2203
2204 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2205 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2206 default:
2207 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2208 wh, "mgt", "subtype 0x%x not handled", subtype);
2209 vap->iv_stats.is_rx_badsubtype++;
2210 break;
2211 }
2212 }
2213
2214 static void
2215 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
2216 {
2217 switch (subtype) {
2218 case IEEE80211_FC0_SUBTYPE_PS_POLL:
2219 hostap_recv_pspoll(ni, m);
2220 break;
2221 case IEEE80211_FC0_SUBTYPE_BAR:
2222 ieee80211_recv_bar(ni, m);
2223 break;
2224 }
2225 }
2226
2227 /*
2228 * Process a received ps-poll frame.
2229 */
2230 static void
2231 hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
2232 {
2233 struct ieee80211vap *vap = ni->ni_vap;
2234 struct ieee80211_frame_min *wh;
2235 struct ifnet *ifp;
2236 struct mbuf *m;
2237 uint16_t aid;
2238 int qlen;
2239
2240 wh = mtod(m0, struct ieee80211_frame_min *);
2241 if (ni->ni_associd == 0) {
2242 IEEE80211_DISCARD(vap,
2243 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2244 (struct ieee80211_frame *) wh, NULL,
2245 "%s", "unassociated station");
2246 vap->iv_stats.is_ps_unassoc++;
2247 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
2248 IEEE80211_REASON_NOT_ASSOCED);
2249 return;
2250 }
2251
2252 aid = le16toh(*(uint16_t *)wh->i_dur);
2253 if (aid != ni->ni_associd) {
2254 IEEE80211_DISCARD(vap,
2255 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2256 (struct ieee80211_frame *) wh, NULL,
2257 "aid mismatch: sta aid 0x%x poll aid 0x%x",
2258 ni->ni_associd, aid);
2259 vap->iv_stats.is_ps_badaid++;
2260 /*
2261 * NB: We used to deauth the station but it turns out
2262 * the Blackberry Curve 8230 (and perhaps other devices)
2263 * sometimes send the wrong AID when WME is negotiated.
2264 * Being more lenient here seems ok as we already check
2265 * the station is associated and we only return frames
2266 * queued for the station (i.e. we don't use the AID).
2267 */
2268 return;
2269 }
2270
2271 /* Okay, take the first queued packet and put it out... */
2272 m = ieee80211_node_psq_dequeue(ni, &qlen);
2273 if (m == NULL) {
2274 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2,
2275 "%s", "recv ps-poll, but queue empty");
2276 ieee80211_send_nulldata(ieee80211_ref_node(ni));
2277 vap->iv_stats.is_ps_qempty++; /* XXX node stat */
2278 if (vap->iv_set_tim != NULL)
2279 vap->iv_set_tim(ni, 0); /* just in case */
2280 return;
2281 }
2282 /*
2283 * If there are more packets, set the more packets bit
2284 * in the packet dispatched to the station; otherwise
2285 * turn off the TIM bit.
2286 */
2287 if (qlen != 0) {
2288 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2289 "recv ps-poll, send packet, %u still queued", qlen);
2290 m->m_flags |= M_MORE_DATA;
2291 } else {
2292 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2293 "%s", "recv ps-poll, send packet, queue empty");
2294 if (vap->iv_set_tim != NULL)
2295 vap->iv_set_tim(ni, 0);
2296 }
2297 m->m_flags |= M_PWR_SAV; /* bypass PS handling */
2298
2299 if (m->m_flags & M_ENCAP)
2300 ifp = vap->iv_ic->ic_ifp;
2301 else
2302 ifp = vap->iv_ifp;
2303 IF_ENQUEUE(&ifp->if_snd, m);
2304 if_start(ifp);
2305 }
Cache object: a637c81862ac455bcfe6915ebc4998bf
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