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/8.1/sys/net80211/ieee80211_hostap.c 206271 2010-04-06 14:07:48Z rpaulo $");
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;
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 need_tap = 1; /* mbuf need to be tapped. */
509 type = -1; /* undefined */
510
511 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
512 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
513 ni->ni_macaddr, NULL,
514 "too short (1): len %u", m->m_pkthdr.len);
515 vap->iv_stats.is_rx_tooshort++;
516 goto out;
517 }
518 /*
519 * Bit of a cheat here, we use a pointer for a 3-address
520 * frame format but don't reference fields past outside
521 * ieee80211_frame_min w/o first validating the data is
522 * present.
523 */
524 wh = mtod(m, struct ieee80211_frame *);
525
526 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
527 IEEE80211_FC0_VERSION_0) {
528 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
529 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
530 wh->i_fc[0], wh->i_fc[1]);
531 vap->iv_stats.is_rx_badversion++;
532 goto err;
533 }
534
535 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
536 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
537 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
538 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
539 if (dir != IEEE80211_FC1_DIR_NODS)
540 bssid = wh->i_addr1;
541 else if (type == IEEE80211_FC0_TYPE_CTL)
542 bssid = wh->i_addr1;
543 else {
544 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
545 IEEE80211_DISCARD_MAC(vap,
546 IEEE80211_MSG_ANY, ni->ni_macaddr,
547 NULL, "too short (2): len %u",
548 m->m_pkthdr.len);
549 vap->iv_stats.is_rx_tooshort++;
550 goto out;
551 }
552 bssid = wh->i_addr3;
553 }
554 /*
555 * Validate the bssid.
556 */
557 if (!(type == IEEE80211_FC0_TYPE_MGT &&
558 subtype == IEEE80211_FC0_SUBTYPE_BEACON) &&
559 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
560 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
561 /* not interested in */
562 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
563 bssid, NULL, "%s", "not to bss");
564 vap->iv_stats.is_rx_wrongbss++;
565 goto out;
566 }
567
568 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
569 ni->ni_noise = nf;
570 if (HAS_SEQ(type)) {
571 uint8_t tid = ieee80211_gettid(wh);
572 if (IEEE80211_QOS_HAS_SEQ(wh) &&
573 TID_TO_WME_AC(tid) >= WME_AC_VI)
574 ic->ic_wme.wme_hipri_traffic++;
575 rxseq = le16toh(*(uint16_t *)wh->i_seq);
576 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
577 (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
578 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
579 /* duplicate, discard */
580 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
581 bssid, "duplicate",
582 "seqno <%u,%u> fragno <%u,%u> tid %u",
583 rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
584 ni->ni_rxseqs[tid] >>
585 IEEE80211_SEQ_SEQ_SHIFT,
586 rxseq & IEEE80211_SEQ_FRAG_MASK,
587 ni->ni_rxseqs[tid] &
588 IEEE80211_SEQ_FRAG_MASK,
589 tid);
590 vap->iv_stats.is_rx_dup++;
591 IEEE80211_NODE_STAT(ni, rx_dup);
592 goto out;
593 }
594 ni->ni_rxseqs[tid] = rxseq;
595 }
596 }
597
598 switch (type) {
599 case IEEE80211_FC0_TYPE_DATA:
600 hdrspace = ieee80211_hdrspace(ic, wh);
601 if (m->m_len < hdrspace &&
602 (m = m_pullup(m, hdrspace)) == NULL) {
603 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
604 ni->ni_macaddr, NULL,
605 "data too short: expecting %u", hdrspace);
606 vap->iv_stats.is_rx_tooshort++;
607 goto out; /* XXX */
608 }
609 if (!(dir == IEEE80211_FC1_DIR_TODS ||
610 (dir == IEEE80211_FC1_DIR_DSTODS &&
611 (vap->iv_flags & IEEE80211_F_DWDS)))) {
612 if (dir != IEEE80211_FC1_DIR_DSTODS) {
613 IEEE80211_DISCARD(vap,
614 IEEE80211_MSG_INPUT, wh, "data",
615 "incorrect dir 0x%x", dir);
616 } else {
617 IEEE80211_DISCARD(vap,
618 IEEE80211_MSG_INPUT |
619 IEEE80211_MSG_WDS, wh,
620 "4-address data",
621 "%s", "DWDS not enabled");
622 }
623 vap->iv_stats.is_rx_wrongdir++;
624 goto out;
625 }
626 /* check if source STA is associated */
627 if (ni == vap->iv_bss) {
628 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
629 wh, "data", "%s", "unknown src");
630 ieee80211_send_error(ni, wh->i_addr2,
631 IEEE80211_FC0_SUBTYPE_DEAUTH,
632 IEEE80211_REASON_NOT_AUTHED);
633 vap->iv_stats.is_rx_notassoc++;
634 goto err;
635 }
636 if (ni->ni_associd == 0) {
637 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
638 wh, "data", "%s", "unassoc src");
639 IEEE80211_SEND_MGMT(ni,
640 IEEE80211_FC0_SUBTYPE_DISASSOC,
641 IEEE80211_REASON_NOT_ASSOCED);
642 vap->iv_stats.is_rx_notassoc++;
643 goto err;
644 }
645
646 /*
647 * Check for power save state change.
648 * XXX out-of-order A-MPDU frames?
649 */
650 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^
651 (ni->ni_flags & IEEE80211_NODE_PWR_MGT)))
652 ieee80211_node_pwrsave(ni,
653 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT);
654 /*
655 * For 4-address packets handle WDS discovery
656 * notifications. Once a WDS link is setup frames
657 * are just delivered to the WDS vap (see below).
658 */
659 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) {
660 if (!ieee80211_node_is_authorized(ni)) {
661 IEEE80211_DISCARD(vap,
662 IEEE80211_MSG_INPUT |
663 IEEE80211_MSG_WDS, wh,
664 "4-address data",
665 "%s", "unauthorized port");
666 vap->iv_stats.is_rx_unauth++;
667 IEEE80211_NODE_STAT(ni, rx_unauth);
668 goto err;
669 }
670 ieee80211_dwds_discover(ni, m);
671 return type;
672 }
673
674 /*
675 * Handle A-MPDU re-ordering. If the frame is to be
676 * processed directly then ieee80211_ampdu_reorder
677 * will return 0; otherwise it has consumed the mbuf
678 * and we should do nothing more with it.
679 */
680 if ((m->m_flags & M_AMPDU) &&
681 ieee80211_ampdu_reorder(ni, m) != 0) {
682 m = NULL;
683 goto out;
684 }
685 resubmit_ampdu:
686
687 /*
688 * Handle privacy requirements. Note that we
689 * must not be preempted from here until after
690 * we (potentially) call ieee80211_crypto_demic;
691 * otherwise we may violate assumptions in the
692 * crypto cipher modules used to do delayed update
693 * of replay sequence numbers.
694 */
695 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
696 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
697 /*
698 * Discard encrypted frames when privacy is off.
699 */
700 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
701 wh, "WEP", "%s", "PRIVACY off");
702 vap->iv_stats.is_rx_noprivacy++;
703 IEEE80211_NODE_STAT(ni, rx_noprivacy);
704 goto out;
705 }
706 key = ieee80211_crypto_decap(ni, m, hdrspace);
707 if (key == NULL) {
708 /* NB: stats+msgs handled in crypto_decap */
709 IEEE80211_NODE_STAT(ni, rx_wepfail);
710 goto out;
711 }
712 wh = mtod(m, struct ieee80211_frame *);
713 wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
714 } else {
715 /* XXX M_WEP and IEEE80211_F_PRIVACY */
716 key = NULL;
717 }
718
719 /*
720 * Save QoS bits for use below--before we strip the header.
721 */
722 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
723 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
724 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
725 ((struct ieee80211_qosframe *)wh)->i_qos[0];
726 } else
727 qos = 0;
728
729 /*
730 * Next up, any fragmentation.
731 */
732 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
733 m = ieee80211_defrag(ni, m, hdrspace);
734 if (m == NULL) {
735 /* Fragment dropped or frame not complete yet */
736 goto out;
737 }
738 }
739 wh = NULL; /* no longer valid, catch any uses */
740
741 /*
742 * Next strip any MSDU crypto bits.
743 */
744 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
745 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
746 ni->ni_macaddr, "data", "%s", "demic error");
747 vap->iv_stats.is_rx_demicfail++;
748 IEEE80211_NODE_STAT(ni, rx_demicfail);
749 goto out;
750 }
751 /* copy to listener after decrypt */
752 if (ieee80211_radiotap_active_vap(vap))
753 ieee80211_radiotap_rx(vap, m);
754 need_tap = 0;
755 /*
756 * Finally, strip the 802.11 header.
757 */
758 m = ieee80211_decap(vap, m, hdrspace);
759 if (m == NULL) {
760 /* XXX mask bit to check for both */
761 /* don't count Null data frames as errors */
762 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
763 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
764 goto out;
765 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
766 ni->ni_macaddr, "data", "%s", "decap error");
767 vap->iv_stats.is_rx_decap++;
768 IEEE80211_NODE_STAT(ni, rx_decap);
769 goto err;
770 }
771 eh = mtod(m, struct ether_header *);
772 if (!ieee80211_node_is_authorized(ni)) {
773 /*
774 * Deny any non-PAE frames received prior to
775 * authorization. For open/shared-key
776 * authentication the port is mark authorized
777 * after authentication completes. For 802.1x
778 * the port is not marked authorized by the
779 * authenticator until the handshake has completed.
780 */
781 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
782 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
783 eh->ether_shost, "data",
784 "unauthorized port: ether type 0x%x len %u",
785 eh->ether_type, m->m_pkthdr.len);
786 vap->iv_stats.is_rx_unauth++;
787 IEEE80211_NODE_STAT(ni, rx_unauth);
788 goto err;
789 }
790 } else {
791 /*
792 * When denying unencrypted frames, discard
793 * any non-PAE frames received without encryption.
794 */
795 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
796 (key == NULL && (m->m_flags & M_WEP) == 0) &&
797 eh->ether_type != htons(ETHERTYPE_PAE)) {
798 /*
799 * Drop unencrypted frames.
800 */
801 vap->iv_stats.is_rx_unencrypted++;
802 IEEE80211_NODE_STAT(ni, rx_unencrypted);
803 goto out;
804 }
805 }
806 /* XXX require HT? */
807 if (qos & IEEE80211_QOS_AMSDU) {
808 m = ieee80211_decap_amsdu(ni, m);
809 if (m == NULL)
810 return IEEE80211_FC0_TYPE_DATA;
811 } else {
812 #ifdef IEEE80211_SUPPORT_SUPERG
813 m = ieee80211_decap_fastframe(vap, ni, m);
814 if (m == NULL)
815 return IEEE80211_FC0_TYPE_DATA;
816 #endif
817 }
818 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
819 ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
820 else
821 hostap_deliver_data(vap, ni, m);
822 return IEEE80211_FC0_TYPE_DATA;
823
824 case IEEE80211_FC0_TYPE_MGT:
825 vap->iv_stats.is_rx_mgmt++;
826 IEEE80211_NODE_STAT(ni, rx_mgmt);
827 if (dir != IEEE80211_FC1_DIR_NODS) {
828 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
829 wh, "mgt", "incorrect dir 0x%x", dir);
830 vap->iv_stats.is_rx_wrongdir++;
831 goto err;
832 }
833 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
834 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
835 ni->ni_macaddr, "mgt", "too short: len %u",
836 m->m_pkthdr.len);
837 vap->iv_stats.is_rx_tooshort++;
838 goto out;
839 }
840 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
841 /* ensure return frames are unicast */
842 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
843 wh, NULL, "source is multicast: %s",
844 ether_sprintf(wh->i_addr2));
845 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */
846 goto out;
847 }
848 #ifdef IEEE80211_DEBUG
849 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
850 ieee80211_msg_dumppkts(vap)) {
851 if_printf(ifp, "received %s from %s rssi %d\n",
852 ieee80211_mgt_subtype_name[subtype >>
853 IEEE80211_FC0_SUBTYPE_SHIFT],
854 ether_sprintf(wh->i_addr2), rssi);
855 }
856 #endif
857 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
858 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
859 /*
860 * Only shared key auth frames with a challenge
861 * should be encrypted, discard all others.
862 */
863 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
864 wh, NULL,
865 "%s", "WEP set but not permitted");
866 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
867 goto out;
868 }
869 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
870 /*
871 * Discard encrypted frames when privacy is off.
872 */
873 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
874 wh, NULL, "%s", "WEP set but PRIVACY off");
875 vap->iv_stats.is_rx_noprivacy++;
876 goto out;
877 }
878 hdrspace = ieee80211_hdrspace(ic, wh);
879 key = ieee80211_crypto_decap(ni, m, hdrspace);
880 if (key == NULL) {
881 /* NB: stats+msgs handled in crypto_decap */
882 goto out;
883 }
884 wh = mtod(m, struct ieee80211_frame *);
885 wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
886 }
887 /*
888 * Pass the packet to radiotap before calling iv_recv_mgmt().
889 * Otherwise iv_recv_mgmt() might pass another packet to
890 * radiotap, resulting in out of order packet captures.
891 */
892 if (ieee80211_radiotap_active_vap(vap))
893 ieee80211_radiotap_rx(vap, m);
894 need_tap = 0;
895 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
896 goto out;
897
898 case IEEE80211_FC0_TYPE_CTL:
899 vap->iv_stats.is_rx_ctl++;
900 IEEE80211_NODE_STAT(ni, rx_ctrl);
901 vap->iv_recv_ctl(ni, m, subtype);
902 goto out;
903 default:
904 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
905 wh, "bad", "frame type 0x%x", type);
906 /* should not come here */
907 break;
908 }
909 err:
910 ifp->if_ierrors++;
911 out:
912 if (m != NULL) {
913 if (need_tap && ieee80211_radiotap_active_vap(vap))
914 ieee80211_radiotap_rx(vap, m);
915 m_freem(m);
916 }
917 return type;
918 #undef SEQ_LEQ
919 }
920
921 static void
922 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
923 int rssi, int nf, uint16_t seq, uint16_t status)
924 {
925 struct ieee80211vap *vap = ni->ni_vap;
926
927 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
928
929 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
930 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
931 ni->ni_macaddr, "open auth",
932 "bad sta auth mode %u", ni->ni_authmode);
933 vap->iv_stats.is_rx_bad_auth++; /* XXX */
934 /*
935 * Clear any challenge text that may be there if
936 * a previous shared key auth failed and then an
937 * open auth is attempted.
938 */
939 if (ni->ni_challenge != NULL) {
940 free(ni->ni_challenge, M_80211_NODE);
941 ni->ni_challenge = NULL;
942 }
943 /* XXX hack to workaround calling convention */
944 ieee80211_send_error(ni, wh->i_addr2,
945 IEEE80211_FC0_SUBTYPE_AUTH,
946 (seq + 1) | (IEEE80211_STATUS_ALG<<16));
947 return;
948 }
949 if (seq != IEEE80211_AUTH_OPEN_REQUEST) {
950 vap->iv_stats.is_rx_bad_auth++;
951 return;
952 }
953 /* always accept open authentication requests */
954 if (ni == vap->iv_bss) {
955 ni = ieee80211_dup_bss(vap, wh->i_addr2);
956 if (ni == NULL)
957 return;
958 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
959 (void) ieee80211_ref_node(ni);
960 /*
961 * Mark the node as referenced to reflect that it's
962 * reference count has been bumped to insure it remains
963 * after the transaction completes.
964 */
965 ni->ni_flags |= IEEE80211_NODE_AREF;
966 /*
967 * Mark the node as requiring a valid association id
968 * before outbound traffic is permitted.
969 */
970 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
971
972 if (vap->iv_acl != NULL &&
973 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
974 /*
975 * When the ACL policy is set to RADIUS we defer the
976 * authorization to a user agent. Dispatch an event,
977 * a subsequent MLME call will decide the fate of the
978 * station. If the user agent is not present then the
979 * node will be reclaimed due to inactivity.
980 */
981 IEEE80211_NOTE_MAC(vap,
982 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr,
983 "%s", "station authentication defered (radius acl)");
984 ieee80211_notify_node_auth(ni);
985 } else {
986 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
987 IEEE80211_NOTE_MAC(vap,
988 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr,
989 "%s", "station authenticated (open)");
990 /*
991 * When 802.1x is not in use mark the port
992 * authorized at this point so traffic can flow.
993 */
994 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
995 ieee80211_node_authorize(ni);
996 }
997 }
998
999 static void
1000 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
1001 uint8_t *frm, uint8_t *efrm, int rssi, int nf,
1002 uint16_t seq, uint16_t status)
1003 {
1004 struct ieee80211vap *vap = ni->ni_vap;
1005 uint8_t *challenge;
1006 int allocbs, estatus;
1007
1008 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
1009
1010 /*
1011 * NB: this can happen as we allow pre-shared key
1012 * authentication to be enabled w/o wep being turned
1013 * on so that configuration of these can be done
1014 * in any order. It may be better to enforce the
1015 * ordering in which case this check would just be
1016 * for sanity/consistency.
1017 */
1018 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1019 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1020 ni->ni_macaddr, "shared key auth",
1021 "%s", " PRIVACY is disabled");
1022 estatus = IEEE80211_STATUS_ALG;
1023 goto bad;
1024 }
1025 /*
1026 * Pre-shared key authentication is evil; accept
1027 * it only if explicitly configured (it is supported
1028 * mainly for compatibility with clients like Mac OS X).
1029 */
1030 if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1031 ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1032 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1033 ni->ni_macaddr, "shared key auth",
1034 "bad sta auth mode %u", ni->ni_authmode);
1035 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1036 estatus = IEEE80211_STATUS_ALG;
1037 goto bad;
1038 }
1039
1040 challenge = NULL;
1041 if (frm + 1 < efrm) {
1042 if ((frm[1] + 2) > (efrm - frm)) {
1043 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1044 ni->ni_macaddr, "shared key auth",
1045 "ie %d/%d too long",
1046 frm[0], (frm[1] + 2) - (efrm - frm));
1047 vap->iv_stats.is_rx_bad_auth++;
1048 estatus = IEEE80211_STATUS_CHALLENGE;
1049 goto bad;
1050 }
1051 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1052 challenge = frm;
1053 frm += frm[1] + 2;
1054 }
1055 switch (seq) {
1056 case IEEE80211_AUTH_SHARED_CHALLENGE:
1057 case IEEE80211_AUTH_SHARED_RESPONSE:
1058 if (challenge == NULL) {
1059 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1060 ni->ni_macaddr, "shared key auth",
1061 "%s", "no challenge");
1062 vap->iv_stats.is_rx_bad_auth++;
1063 estatus = IEEE80211_STATUS_CHALLENGE;
1064 goto bad;
1065 }
1066 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1067 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1068 ni->ni_macaddr, "shared key auth",
1069 "bad challenge len %d", challenge[1]);
1070 vap->iv_stats.is_rx_bad_auth++;
1071 estatus = IEEE80211_STATUS_CHALLENGE;
1072 goto bad;
1073 }
1074 default:
1075 break;
1076 }
1077 switch (seq) {
1078 case IEEE80211_AUTH_SHARED_REQUEST:
1079 if (ni == vap->iv_bss) {
1080 ni = ieee80211_dup_bss(vap, wh->i_addr2);
1081 if (ni == NULL) {
1082 /* NB: no way to return an error */
1083 return;
1084 }
1085 allocbs = 1;
1086 } else {
1087 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
1088 (void) ieee80211_ref_node(ni);
1089 allocbs = 0;
1090 }
1091 /*
1092 * Mark the node as referenced to reflect that it's
1093 * reference count has been bumped to insure it remains
1094 * after the transaction completes.
1095 */
1096 ni->ni_flags |= IEEE80211_NODE_AREF;
1097 /*
1098 * Mark the node as requiring a valid associatio id
1099 * before outbound traffic is permitted.
1100 */
1101 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
1102 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
1103 ni->ni_noise = nf;
1104 if (!ieee80211_alloc_challenge(ni)) {
1105 /* NB: don't return error so they rexmit */
1106 return;
1107 }
1108 get_random_bytes(ni->ni_challenge,
1109 IEEE80211_CHALLENGE_LEN);
1110 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1111 ni, "shared key %sauth request", allocbs ? "" : "re");
1112 /*
1113 * When the ACL policy is set to RADIUS we defer the
1114 * authorization to a user agent. Dispatch an event,
1115 * a subsequent MLME call will decide the fate of the
1116 * station. If the user agent is not present then the
1117 * node will be reclaimed due to inactivity.
1118 */
1119 if (vap->iv_acl != NULL &&
1120 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
1121 IEEE80211_NOTE_MAC(vap,
1122 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL,
1123 ni->ni_macaddr,
1124 "%s", "station authentication defered (radius acl)");
1125 ieee80211_notify_node_auth(ni);
1126 return;
1127 }
1128 break;
1129 case IEEE80211_AUTH_SHARED_RESPONSE:
1130 if (ni == vap->iv_bss) {
1131 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1132 ni->ni_macaddr, "shared key response",
1133 "%s", "unknown station");
1134 /* NB: don't send a response */
1135 return;
1136 }
1137 if (ni->ni_challenge == NULL) {
1138 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1139 ni->ni_macaddr, "shared key response",
1140 "%s", "no challenge recorded");
1141 vap->iv_stats.is_rx_bad_auth++;
1142 estatus = IEEE80211_STATUS_CHALLENGE;
1143 goto bad;
1144 }
1145 if (memcmp(ni->ni_challenge, &challenge[2],
1146 challenge[1]) != 0) {
1147 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1148 ni->ni_macaddr, "shared key response",
1149 "%s", "challenge mismatch");
1150 vap->iv_stats.is_rx_auth_fail++;
1151 estatus = IEEE80211_STATUS_CHALLENGE;
1152 goto bad;
1153 }
1154 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1155 ni, "%s", "station authenticated (shared key)");
1156 ieee80211_node_authorize(ni);
1157 break;
1158 default:
1159 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1160 ni->ni_macaddr, "shared key auth",
1161 "bad seq %d", seq);
1162 vap->iv_stats.is_rx_bad_auth++;
1163 estatus = IEEE80211_STATUS_SEQUENCE;
1164 goto bad;
1165 }
1166 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1167 return;
1168 bad:
1169 /*
1170 * Send an error response; but only when operating as an AP.
1171 */
1172 /* XXX hack to workaround calling convention */
1173 ieee80211_send_error(ni, wh->i_addr2,
1174 IEEE80211_FC0_SUBTYPE_AUTH,
1175 (seq + 1) | (estatus<<16));
1176 }
1177
1178 /*
1179 * Convert a WPA cipher selector OUI to an internal
1180 * cipher algorithm. Where appropriate we also
1181 * record any key length.
1182 */
1183 static int
1184 wpa_cipher(const uint8_t *sel, uint8_t *keylen)
1185 {
1186 #define WPA_SEL(x) (((x)<<24)|WPA_OUI)
1187 uint32_t w = LE_READ_4(sel);
1188
1189 switch (w) {
1190 case WPA_SEL(WPA_CSE_NULL):
1191 return IEEE80211_CIPHER_NONE;
1192 case WPA_SEL(WPA_CSE_WEP40):
1193 if (keylen)
1194 *keylen = 40 / NBBY;
1195 return IEEE80211_CIPHER_WEP;
1196 case WPA_SEL(WPA_CSE_WEP104):
1197 if (keylen)
1198 *keylen = 104 / NBBY;
1199 return IEEE80211_CIPHER_WEP;
1200 case WPA_SEL(WPA_CSE_TKIP):
1201 return IEEE80211_CIPHER_TKIP;
1202 case WPA_SEL(WPA_CSE_CCMP):
1203 return IEEE80211_CIPHER_AES_CCM;
1204 }
1205 return 32; /* NB: so 1<< is discarded */
1206 #undef WPA_SEL
1207 }
1208
1209 /*
1210 * Convert a WPA key management/authentication algorithm
1211 * to an internal code.
1212 */
1213 static int
1214 wpa_keymgmt(const uint8_t *sel)
1215 {
1216 #define WPA_SEL(x) (((x)<<24)|WPA_OUI)
1217 uint32_t w = LE_READ_4(sel);
1218
1219 switch (w) {
1220 case WPA_SEL(WPA_ASE_8021X_UNSPEC):
1221 return WPA_ASE_8021X_UNSPEC;
1222 case WPA_SEL(WPA_ASE_8021X_PSK):
1223 return WPA_ASE_8021X_PSK;
1224 case WPA_SEL(WPA_ASE_NONE):
1225 return WPA_ASE_NONE;
1226 }
1227 return 0; /* NB: so is discarded */
1228 #undef WPA_SEL
1229 }
1230
1231 /*
1232 * Parse a WPA information element to collect parameters.
1233 * Note that we do not validate security parameters; that
1234 * is handled by the authenticator; the parsing done here
1235 * is just for internal use in making operational decisions.
1236 */
1237 static int
1238 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm,
1239 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1240 {
1241 uint8_t len = frm[1];
1242 uint32_t w;
1243 int n;
1244
1245 /*
1246 * Check the length once for fixed parts: OUI, type,
1247 * version, mcast cipher, and 2 selector counts.
1248 * Other, variable-length data, must be checked separately.
1249 */
1250 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) {
1251 IEEE80211_DISCARD_IE(vap,
1252 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1253 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags);
1254 return IEEE80211_REASON_IE_INVALID;
1255 }
1256 if (len < 14) {
1257 IEEE80211_DISCARD_IE(vap,
1258 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1259 wh, "WPA", "too short, len %u", len);
1260 return IEEE80211_REASON_IE_INVALID;
1261 }
1262 frm += 6, len -= 4; /* NB: len is payload only */
1263 /* NB: iswapoui already validated the OUI and type */
1264 w = LE_READ_2(frm);
1265 if (w != WPA_VERSION) {
1266 IEEE80211_DISCARD_IE(vap,
1267 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1268 wh, "WPA", "bad version %u", w);
1269 return IEEE80211_REASON_IE_INVALID;
1270 }
1271 frm += 2, len -= 2;
1272
1273 memset(rsn, 0, sizeof(*rsn));
1274
1275 /* multicast/group cipher */
1276 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen);
1277 frm += 4, len -= 4;
1278
1279 /* unicast ciphers */
1280 n = LE_READ_2(frm);
1281 frm += 2, len -= 2;
1282 if (len < n*4+2) {
1283 IEEE80211_DISCARD_IE(vap,
1284 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1285 wh, "WPA", "ucast cipher data too short; len %u, n %u",
1286 len, n);
1287 return IEEE80211_REASON_IE_INVALID;
1288 }
1289 w = 0;
1290 for (; n > 0; n--) {
1291 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen);
1292 frm += 4, len -= 4;
1293 }
1294 if (w & (1<<IEEE80211_CIPHER_TKIP))
1295 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1296 else
1297 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1298
1299 /* key management algorithms */
1300 n = LE_READ_2(frm);
1301 frm += 2, len -= 2;
1302 if (len < n*4) {
1303 IEEE80211_DISCARD_IE(vap,
1304 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1305 wh, "WPA", "key mgmt alg data too short; len %u, n %u",
1306 len, n);
1307 return IEEE80211_REASON_IE_INVALID;
1308 }
1309 w = 0;
1310 for (; n > 0; n--) {
1311 w |= wpa_keymgmt(frm);
1312 frm += 4, len -= 4;
1313 }
1314 if (w & WPA_ASE_8021X_UNSPEC)
1315 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC;
1316 else
1317 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
1318
1319 if (len > 2) /* optional capabilities */
1320 rsn->rsn_caps = LE_READ_2(frm);
1321
1322 return 0;
1323 }
1324
1325 /*
1326 * Convert an RSN cipher selector OUI to an internal
1327 * cipher algorithm. Where appropriate we also
1328 * record any key length.
1329 */
1330 static int
1331 rsn_cipher(const uint8_t *sel, uint8_t *keylen)
1332 {
1333 #define RSN_SEL(x) (((x)<<24)|RSN_OUI)
1334 uint32_t w = LE_READ_4(sel);
1335
1336 switch (w) {
1337 case RSN_SEL(RSN_CSE_NULL):
1338 return IEEE80211_CIPHER_NONE;
1339 case RSN_SEL(RSN_CSE_WEP40):
1340 if (keylen)
1341 *keylen = 40 / NBBY;
1342 return IEEE80211_CIPHER_WEP;
1343 case RSN_SEL(RSN_CSE_WEP104):
1344 if (keylen)
1345 *keylen = 104 / NBBY;
1346 return IEEE80211_CIPHER_WEP;
1347 case RSN_SEL(RSN_CSE_TKIP):
1348 return IEEE80211_CIPHER_TKIP;
1349 case RSN_SEL(RSN_CSE_CCMP):
1350 return IEEE80211_CIPHER_AES_CCM;
1351 case RSN_SEL(RSN_CSE_WRAP):
1352 return IEEE80211_CIPHER_AES_OCB;
1353 }
1354 return 32; /* NB: so 1<< is discarded */
1355 #undef WPA_SEL
1356 }
1357
1358 /*
1359 * Convert an RSN key management/authentication algorithm
1360 * to an internal code.
1361 */
1362 static int
1363 rsn_keymgmt(const uint8_t *sel)
1364 {
1365 #define RSN_SEL(x) (((x)<<24)|RSN_OUI)
1366 uint32_t w = LE_READ_4(sel);
1367
1368 switch (w) {
1369 case RSN_SEL(RSN_ASE_8021X_UNSPEC):
1370 return RSN_ASE_8021X_UNSPEC;
1371 case RSN_SEL(RSN_ASE_8021X_PSK):
1372 return RSN_ASE_8021X_PSK;
1373 case RSN_SEL(RSN_ASE_NONE):
1374 return RSN_ASE_NONE;
1375 }
1376 return 0; /* NB: so is discarded */
1377 #undef RSN_SEL
1378 }
1379
1380 /*
1381 * Parse a WPA/RSN information element to collect parameters
1382 * and validate the parameters against what has been
1383 * configured for the system.
1384 */
1385 static int
1386 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm,
1387 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1388 {
1389 uint8_t len = frm[1];
1390 uint32_t w;
1391 int n;
1392
1393 /*
1394 * Check the length once for fixed parts:
1395 * version, mcast cipher, and 2 selector counts.
1396 * Other, variable-length data, must be checked separately.
1397 */
1398 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) {
1399 IEEE80211_DISCARD_IE(vap,
1400 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1401 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags);
1402 return IEEE80211_REASON_IE_INVALID;
1403 }
1404 if (len < 10) {
1405 IEEE80211_DISCARD_IE(vap,
1406 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1407 wh, "RSN", "too short, len %u", len);
1408 return IEEE80211_REASON_IE_INVALID;
1409 }
1410 frm += 2;
1411 w = LE_READ_2(frm);
1412 if (w != RSN_VERSION) {
1413 IEEE80211_DISCARD_IE(vap,
1414 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1415 wh, "RSN", "bad version %u", w);
1416 return IEEE80211_REASON_IE_INVALID;
1417 }
1418 frm += 2, len -= 2;
1419
1420 memset(rsn, 0, sizeof(*rsn));
1421
1422 /* multicast/group cipher */
1423 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen);
1424 frm += 4, len -= 4;
1425
1426 /* unicast ciphers */
1427 n = LE_READ_2(frm);
1428 frm += 2, len -= 2;
1429 if (len < n*4+2) {
1430 IEEE80211_DISCARD_IE(vap,
1431 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1432 wh, "RSN", "ucast cipher data too short; len %u, n %u",
1433 len, n);
1434 return IEEE80211_REASON_IE_INVALID;
1435 }
1436 w = 0;
1437 for (; n > 0; n--) {
1438 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen);
1439 frm += 4, len -= 4;
1440 }
1441 if (w & (1<<IEEE80211_CIPHER_TKIP))
1442 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1443 else
1444 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1445
1446 /* key management algorithms */
1447 n = LE_READ_2(frm);
1448 frm += 2, len -= 2;
1449 if (len < n*4) {
1450 IEEE80211_DISCARD_IE(vap,
1451 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1452 wh, "RSN", "key mgmt alg data too short; len %u, n %u",
1453 len, n);
1454 return IEEE80211_REASON_IE_INVALID;
1455 }
1456 w = 0;
1457 for (; n > 0; n--) {
1458 w |= rsn_keymgmt(frm);
1459 frm += 4, len -= 4;
1460 }
1461 if (w & RSN_ASE_8021X_UNSPEC)
1462 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC;
1463 else
1464 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK;
1465
1466 /* optional RSN capabilities */
1467 if (len > 2)
1468 rsn->rsn_caps = LE_READ_2(frm);
1469 /* XXXPMKID */
1470
1471 return 0;
1472 }
1473
1474 /*
1475 * WPA/802.11i assocation request processing.
1476 */
1477 static int
1478 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms,
1479 const struct ieee80211_frame *wh, const uint8_t *wpa,
1480 const uint8_t *rsn, uint16_t capinfo)
1481 {
1482 struct ieee80211vap *vap = ni->ni_vap;
1483 uint8_t reason;
1484 int badwparsn;
1485
1486 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN);
1487 if (wpa == NULL && rsn == NULL) {
1488 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) {
1489 /*
1490 * W-Fi Protected Setup (WPS) permits
1491 * clients to associate and pass EAPOL frames
1492 * to establish initial credentials.
1493 */
1494 ni->ni_flags |= IEEE80211_NODE_WPS;
1495 return 1;
1496 }
1497 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) &&
1498 (capinfo & IEEE80211_CAPINFO_PRIVACY)) {
1499 /*
1500 * Transitional Security Network. Permits clients
1501 * to associate and use WEP while WPA is configured.
1502 */
1503 ni->ni_flags |= IEEE80211_NODE_TSN;
1504 return 1;
1505 }
1506 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1507 wh, NULL, "%s", "no WPA/RSN IE in association request");
1508 vap->iv_stats.is_rx_assoc_badwpaie++;
1509 reason = IEEE80211_REASON_IE_INVALID;
1510 goto bad;
1511 }
1512 /* assert right association security credentials */
1513 badwparsn = 0; /* NB: to silence compiler */
1514 switch (vap->iv_flags & IEEE80211_F_WPA) {
1515 case IEEE80211_F_WPA1:
1516 badwparsn = (wpa == NULL);
1517 break;
1518 case IEEE80211_F_WPA2:
1519 badwparsn = (rsn == NULL);
1520 break;
1521 case IEEE80211_F_WPA1|IEEE80211_F_WPA2:
1522 badwparsn = (wpa == NULL && rsn == NULL);
1523 break;
1524 }
1525 if (badwparsn) {
1526 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1527 wh, NULL,
1528 "%s", "missing WPA/RSN IE in association request");
1529 vap->iv_stats.is_rx_assoc_badwpaie++;
1530 reason = IEEE80211_REASON_IE_INVALID;
1531 goto bad;
1532 }
1533 /*
1534 * Parse WPA/RSN information element.
1535 */
1536 if (wpa != NULL)
1537 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh);
1538 else
1539 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh);
1540 if (reason != 0) {
1541 /* XXX distinguish WPA/RSN? */
1542 vap->iv_stats.is_rx_assoc_badwpaie++;
1543 goto bad;
1544 }
1545 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni,
1546 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x",
1547 wpa != NULL ? "WPA" : "RSN",
1548 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen,
1549 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen,
1550 rsnparms->rsn_keymgmt, rsnparms->rsn_caps);
1551
1552 return 1;
1553 bad:
1554 ieee80211_node_deauth(ni, reason);
1555 return 0;
1556 }
1557
1558 /* XXX find a better place for definition */
1559 struct l2_update_frame {
1560 struct ether_header eh;
1561 uint8_t dsap;
1562 uint8_t ssap;
1563 uint8_t control;
1564 uint8_t xid[3];
1565 } __packed;
1566
1567 /*
1568 * Deliver a TGf L2UF frame on behalf of a station.
1569 * This primes any bridge when the station is roaming
1570 * between ap's on the same wired network.
1571 */
1572 static void
1573 ieee80211_deliver_l2uf(struct ieee80211_node *ni)
1574 {
1575 struct ieee80211vap *vap = ni->ni_vap;
1576 struct ifnet *ifp = vap->iv_ifp;
1577 struct mbuf *m;
1578 struct l2_update_frame *l2uf;
1579 struct ether_header *eh;
1580
1581 m = m_gethdr(M_NOWAIT, MT_DATA);
1582 if (m == NULL) {
1583 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1584 "%s", "no mbuf for l2uf frame");
1585 vap->iv_stats.is_rx_nobuf++; /* XXX not right */
1586 return;
1587 }
1588 l2uf = mtod(m, struct l2_update_frame *);
1589 eh = &l2uf->eh;
1590 /* dst: Broadcast address */
1591 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr);
1592 /* src: associated STA */
1593 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr);
1594 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh));
1595
1596 l2uf->dsap = 0;
1597 l2uf->ssap = 0;
1598 l2uf->control = 0xf5;
1599 l2uf->xid[0] = 0x81;
1600 l2uf->xid[1] = 0x80;
1601 l2uf->xid[2] = 0x00;
1602
1603 m->m_pkthdr.len = m->m_len = sizeof(*l2uf);
1604 hostap_deliver_data(vap, ni, m);
1605 }
1606
1607 static void
1608 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1609 int reassoc, int resp, const char *tag, int rate)
1610 {
1611 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1612 "deny %s request, %s rate set mismatch, rate/MCS %d",
1613 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL);
1614 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE);
1615 ieee80211_node_leave(ni);
1616 }
1617
1618 static void
1619 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1620 int reassoc, int resp, const char *tag, int capinfo)
1621 {
1622 struct ieee80211vap *vap = ni->ni_vap;
1623
1624 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1625 "deny %s request, %s mismatch 0x%x",
1626 reassoc ? "reassoc" : "assoc", tag, capinfo);
1627 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO);
1628 ieee80211_node_leave(ni);
1629 vap->iv_stats.is_rx_assoc_capmismatch++;
1630 }
1631
1632 static void
1633 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1634 int reassoc, int resp)
1635 {
1636 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1637 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc");
1638 /* XXX no better code */
1639 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS);
1640 ieee80211_node_leave(ni);
1641 }
1642
1643 static void
1644 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1645 int algo, int seq, int status)
1646 {
1647 struct ieee80211vap *vap = ni->ni_vap;
1648
1649 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1650 wh, NULL, "unsupported alg %d", algo);
1651 vap->iv_stats.is_rx_auth_unsupported++;
1652 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH,
1653 seq | (status << 16));
1654 }
1655
1656 static __inline int
1657 ishtmixed(const uint8_t *ie)
1658 {
1659 const struct ieee80211_ie_htinfo *ht =
1660 (const struct ieee80211_ie_htinfo *) ie;
1661 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) ==
1662 IEEE80211_HTINFO_OPMODE_MIXED;
1663 }
1664
1665 static int
1666 is11bclient(const uint8_t *rates, const uint8_t *xrates)
1667 {
1668 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
1669 int i;
1670
1671 /* NB: the 11b clients we care about will not have xrates */
1672 if (xrates != NULL || rates == NULL)
1673 return 0;
1674 for (i = 0; i < rates[1]; i++) {
1675 int r = rates[2+i] & IEEE80211_RATE_VAL;
1676 if (r > 2*11 || ((1<<r) & brates) == 0)
1677 return 0;
1678 }
1679 return 1;
1680 }
1681
1682 static void
1683 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1684 int subtype, int rssi, int nf)
1685 {
1686 struct ieee80211vap *vap = ni->ni_vap;
1687 struct ieee80211com *ic = ni->ni_ic;
1688 struct ieee80211_frame *wh;
1689 uint8_t *frm, *efrm, *sfrm;
1690 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap;
1691 int reassoc, resp;
1692 uint8_t rate;
1693
1694 wh = mtod(m0, struct ieee80211_frame *);
1695 frm = (uint8_t *)&wh[1];
1696 efrm = mtod(m0, uint8_t *) + m0->m_len;
1697 switch (subtype) {
1698 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1699 case IEEE80211_FC0_SUBTYPE_BEACON: {
1700 struct ieee80211_scanparams scan;
1701 /*
1702 * We process beacon/probe response frames when scanning;
1703 * otherwise we check beacon frames for overlapping non-ERP
1704 * BSS in 11g and/or overlapping legacy BSS when in HT.
1705 */
1706 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 &&
1707 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) {
1708 vap->iv_stats.is_rx_mgtdiscard++;
1709 return;
1710 }
1711 /* NB: accept off-channel frames */
1712 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN)
1713 return;
1714 /*
1715 * Count frame now that we know it's to be processed.
1716 */
1717 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1718 vap->iv_stats.is_rx_beacon++; /* XXX remove */
1719 IEEE80211_NODE_STAT(ni, rx_beacons);
1720 } else
1721 IEEE80211_NODE_STAT(ni, rx_proberesp);
1722 /*
1723 * If scanning, just pass information to the scan module.
1724 */
1725 if (ic->ic_flags & IEEE80211_F_SCAN) {
1726 if (scan.status == 0 && /* NB: on channel */
1727 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) {
1728 /*
1729 * Actively scanning a channel marked passive;
1730 * send a probe request now that we know there
1731 * is 802.11 traffic present.
1732 *
1733 * XXX check if the beacon we recv'd gives
1734 * us what we need and suppress the probe req
1735 */
1736 ieee80211_probe_curchan(vap, 1);
1737 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1738 }
1739 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
1740 return;
1741 }
1742 /*
1743 * Check beacon for overlapping bss w/ non ERP stations.
1744 * If we detect one and protection is configured but not
1745 * enabled, enable it and start a timer that'll bring us
1746 * out if we stop seeing the bss.
1747 */
1748 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1749 scan.status == 0 && /* NB: on-channel */
1750 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/
1751 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) {
1752 ic->ic_lastnonerp = ticks;
1753 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR;
1754 if (ic->ic_protmode != IEEE80211_PROT_NONE &&
1755 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) {
1756 IEEE80211_NOTE_FRAME(vap,
1757 IEEE80211_MSG_ASSOC, wh,
1758 "non-ERP present on channel %d "
1759 "(saw erp 0x%x from channel %d), "
1760 "enable use of protection",
1761 ic->ic_curchan->ic_ieee,
1762 scan.erp, scan.chan);
1763 ic->ic_flags |= IEEE80211_F_USEPROT;
1764 ieee80211_notify_erp(ic);
1765 }
1766 }
1767 /*
1768 * Check beacon for non-HT station on HT channel
1769 * and update HT BSS occupancy as appropriate.
1770 */
1771 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) {
1772 if (scan.status & IEEE80211_BPARSE_OFFCHAN) {
1773 /*
1774 * Off control channel; only check frames
1775 * that come in the extension channel when
1776 * operating w/ HT40.
1777 */
1778 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan))
1779 break;
1780 if (scan.chan != ic->ic_curchan->ic_extieee)
1781 break;
1782 }
1783 if (scan.htinfo == NULL) {
1784 ieee80211_htprot_update(ic,
1785 IEEE80211_HTINFO_OPMODE_PROTOPT |
1786 IEEE80211_HTINFO_NONHT_PRESENT);
1787 } else if (ishtmixed(scan.htinfo)) {
1788 /* XXX? take NONHT_PRESENT from beacon? */
1789 ieee80211_htprot_update(ic,
1790 IEEE80211_HTINFO_OPMODE_MIXED |
1791 IEEE80211_HTINFO_NONHT_PRESENT);
1792 }
1793 }
1794 break;
1795 }
1796
1797 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1798 if (vap->iv_state != IEEE80211_S_RUN) {
1799 vap->iv_stats.is_rx_mgtdiscard++;
1800 return;
1801 }
1802 /*
1803 * prreq frame format
1804 * [tlv] ssid
1805 * [tlv] supported rates
1806 * [tlv] extended supported rates
1807 */
1808 ssid = rates = xrates = NULL;
1809 sfrm = frm;
1810 while (efrm - frm > 1) {
1811 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1812 switch (*frm) {
1813 case IEEE80211_ELEMID_SSID:
1814 ssid = frm;
1815 break;
1816 case IEEE80211_ELEMID_RATES:
1817 rates = frm;
1818 break;
1819 case IEEE80211_ELEMID_XRATES:
1820 xrates = frm;
1821 break;
1822 }
1823 frm += frm[1] + 2;
1824 }
1825 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1826 if (xrates != NULL)
1827 IEEE80211_VERIFY_ELEMENT(xrates,
1828 IEEE80211_RATE_MAXSIZE - rates[1], return);
1829 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
1830 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
1831 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
1832 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1833 wh, NULL,
1834 "%s", "no ssid with ssid suppression enabled");
1835 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
1836 return;
1837 }
1838
1839 /* XXX find a better class or define it's own */
1840 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
1841 "%s", "recv probe req");
1842 /*
1843 * Some legacy 11b clients cannot hack a complete
1844 * probe response frame. When the request includes
1845 * only a bare-bones rate set, communicate this to
1846 * the transmit side.
1847 */
1848 ieee80211_send_proberesp(vap, wh->i_addr2,
1849 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
1850 break;
1851
1852 case IEEE80211_FC0_SUBTYPE_AUTH: {
1853 uint16_t algo, seq, status;
1854
1855 if (vap->iv_state != IEEE80211_S_RUN) {
1856 vap->iv_stats.is_rx_mgtdiscard++;
1857 return;
1858 }
1859 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1860 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1861 wh, NULL, "%s", "wrong bssid");
1862 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/
1863 return;
1864 }
1865 /*
1866 * auth frame format
1867 * [2] algorithm
1868 * [2] sequence
1869 * [2] status
1870 * [tlv*] challenge
1871 */
1872 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1873 algo = le16toh(*(uint16_t *)frm);
1874 seq = le16toh(*(uint16_t *)(frm + 2));
1875 status = le16toh(*(uint16_t *)(frm + 4));
1876 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1877 "recv auth frame with algorithm %d seq %d", algo, seq);
1878 /*
1879 * Consult the ACL policy module if setup.
1880 */
1881 if (vap->iv_acl != NULL &&
1882 !vap->iv_acl->iac_check(vap, wh->i_addr2)) {
1883 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1884 wh, NULL, "%s", "disallowed by ACL");
1885 vap->iv_stats.is_rx_acl++;
1886 ieee80211_send_error(ni, wh->i_addr2,
1887 IEEE80211_FC0_SUBTYPE_AUTH,
1888 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16));
1889 return;
1890 }
1891 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1892 IEEE80211_DISCARD(vap,
1893 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1894 wh, NULL, "%s", "TKIP countermeasures enabled");
1895 vap->iv_stats.is_rx_auth_countermeasures++;
1896 ieee80211_send_error(ni, wh->i_addr2,
1897 IEEE80211_FC0_SUBTYPE_AUTH,
1898 IEEE80211_REASON_MIC_FAILURE);
1899 return;
1900 }
1901 if (algo == IEEE80211_AUTH_ALG_SHARED)
1902 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1903 seq, status);
1904 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1905 hostap_auth_open(ni, wh, rssi, nf, seq, status);
1906 else if (algo == IEEE80211_AUTH_ALG_LEAP) {
1907 authalgreject(ni, wh, algo,
1908 seq+1, IEEE80211_STATUS_ALG);
1909 return;
1910 } else {
1911 /*
1912 * We assume that an unknown algorithm is the result
1913 * of a decryption failure on a shared key auth frame;
1914 * return a status code appropriate for that instead
1915 * of IEEE80211_STATUS_ALG.
1916 *
1917 * NB: a seq# of 4 is intentional; the decrypted
1918 * frame likely has a bogus seq value.
1919 */
1920 authalgreject(ni, wh, algo,
1921 4, IEEE80211_STATUS_CHALLENGE);
1922 return;
1923 }
1924 break;
1925 }
1926
1927 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1928 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
1929 uint16_t capinfo, lintval;
1930 struct ieee80211_rsnparms rsnparms;
1931
1932 if (vap->iv_state != IEEE80211_S_RUN) {
1933 vap->iv_stats.is_rx_mgtdiscard++;
1934 return;
1935 }
1936 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1937 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1938 wh, NULL, "%s", "wrong bssid");
1939 vap->iv_stats.is_rx_assoc_bss++;
1940 return;
1941 }
1942 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
1943 reassoc = 1;
1944 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
1945 } else {
1946 reassoc = 0;
1947 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
1948 }
1949 if (ni == vap->iv_bss) {
1950 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1951 "deny %s request, sta not authenticated",
1952 reassoc ? "reassoc" : "assoc");
1953 ieee80211_send_error(ni, wh->i_addr2,
1954 IEEE80211_FC0_SUBTYPE_DEAUTH,
1955 IEEE80211_REASON_ASSOC_NOT_AUTHED);
1956 vap->iv_stats.is_rx_assoc_notauth++;
1957 return;
1958 }
1959
1960 /*
1961 * asreq frame format
1962 * [2] capability information
1963 * [2] listen interval
1964 * [6*] current AP address (reassoc only)
1965 * [tlv] ssid
1966 * [tlv] supported rates
1967 * [tlv] extended supported rates
1968 * [tlv] WPA or RSN
1969 * [tlv] HT capabilities
1970 * [tlv] Atheros capabilities
1971 */
1972 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return);
1973 capinfo = le16toh(*(uint16_t *)frm); frm += 2;
1974 lintval = le16toh(*(uint16_t *)frm); frm += 2;
1975 if (reassoc)
1976 frm += 6; /* ignore current AP info */
1977 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL;
1978 sfrm = frm;
1979 while (efrm - frm > 1) {
1980 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1981 switch (*frm) {
1982 case IEEE80211_ELEMID_SSID:
1983 ssid = frm;
1984 break;
1985 case IEEE80211_ELEMID_RATES:
1986 rates = frm;
1987 break;
1988 case IEEE80211_ELEMID_XRATES:
1989 xrates = frm;
1990 break;
1991 case IEEE80211_ELEMID_RSN:
1992 rsn = frm;
1993 break;
1994 case IEEE80211_ELEMID_HTCAP:
1995 htcap = frm;
1996 break;
1997 case IEEE80211_ELEMID_VENDOR:
1998 if (iswpaoui(frm))
1999 wpa = frm;
2000 else if (iswmeinfo(frm))
2001 wme = frm;
2002 #ifdef IEEE80211_SUPPORT_SUPERG
2003 else if (isatherosoui(frm))
2004 ath = frm;
2005 #endif
2006 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
2007 if (ishtcapoui(frm) && htcap == NULL)
2008 htcap = frm;
2009 }
2010 break;
2011 }
2012 frm += frm[1] + 2;
2013 }
2014 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
2015 if (xrates != NULL)
2016 IEEE80211_VERIFY_ELEMENT(xrates,
2017 IEEE80211_RATE_MAXSIZE - rates[1], return);
2018 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
2019 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
2020 if (htcap != NULL) {
2021 IEEE80211_VERIFY_LENGTH(htcap[1],
2022 htcap[0] == IEEE80211_ELEMID_VENDOR ?
2023 4 + sizeof(struct ieee80211_ie_htcap)-2 :
2024 sizeof(struct ieee80211_ie_htcap)-2,
2025 return); /* XXX just NULL out? */
2026 }
2027
2028 if ((vap->iv_flags & IEEE80211_F_WPA) &&
2029 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo))
2030 return;
2031 /* discard challenge after association */
2032 if (ni->ni_challenge != NULL) {
2033 free(ni->ni_challenge, M_80211_NODE);
2034 ni->ni_challenge = NULL;
2035 }
2036 /* NB: 802.11 spec says to ignore station's privacy bit */
2037 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
2038 capinfomismatch(ni, wh, reassoc, resp,
2039 "capability", capinfo);
2040 return;
2041 }
2042 /*
2043 * Disallow re-associate w/ invalid slot time setting.
2044 */
2045 if (ni->ni_associd != 0 &&
2046 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2047 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
2048 capinfomismatch(ni, wh, reassoc, resp,
2049 "slot time", capinfo);
2050 return;
2051 }
2052 rate = ieee80211_setup_rates(ni, rates, xrates,
2053 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
2054 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
2055 if (rate & IEEE80211_RATE_BASIC) {
2056 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate);
2057 vap->iv_stats.is_rx_assoc_norate++;
2058 return;
2059 }
2060 /*
2061 * If constrained to 11g-only stations reject an
2062 * 11b-only station. We cheat a bit here by looking
2063 * at the max negotiated xmit rate and assuming anyone
2064 * with a best rate <24Mb/s is an 11b station.
2065 */
2066 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) {
2067 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate);
2068 vap->iv_stats.is_rx_assoc_norate++;
2069 return;
2070 }
2071 /*
2072 * Do HT rate set handling and setup HT node state.
2073 */
2074 ni->ni_chan = vap->iv_bss->ni_chan;
2075 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2076 rate = ieee80211_setup_htrates(ni, htcap,
2077 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO |
2078 IEEE80211_F_DOBRS);
2079 if (rate & IEEE80211_RATE_BASIC) {
2080 ratesetmismatch(ni, wh, reassoc, resp,
2081 "HT", rate);
2082 vap->iv_stats.is_ht_assoc_norate++;
2083 return;
2084 }
2085 ieee80211_ht_node_init(ni);
2086 ieee80211_ht_updatehtcap(ni, htcap);
2087 } else if (ni->ni_flags & IEEE80211_NODE_HT)
2088 ieee80211_ht_node_cleanup(ni);
2089 #ifdef IEEE80211_SUPPORT_SUPERG
2090 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH)
2091 ieee80211_ff_node_cleanup(ni);
2092 #endif
2093 /*
2094 * Allow AMPDU operation only with unencrypted traffic
2095 * or AES-CCM; the 11n spec only specifies these ciphers
2096 * so permitting any others is undefined and can lead
2097 * to interoperability problems.
2098 */
2099 if ((ni->ni_flags & IEEE80211_NODE_HT) &&
2100 (((vap->iv_flags & IEEE80211_F_WPA) &&
2101 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) ||
2102 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) {
2103 IEEE80211_NOTE(vap,
2104 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
2105 "disallow HT use because WEP or TKIP requested, "
2106 "capinfo 0x%x ucastcipher %d", capinfo,
2107 rsnparms.rsn_ucastcipher);
2108 ieee80211_ht_node_cleanup(ni);
2109 vap->iv_stats.is_ht_assoc_downgrade++;
2110 }
2111 /*
2112 * If constrained to 11n-only stations reject legacy stations.
2113 */
2114 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) &&
2115 (ni->ni_flags & IEEE80211_NODE_HT) == 0) {
2116 htcapmismatch(ni, wh, reassoc, resp);
2117 vap->iv_stats.is_ht_assoc_nohtcap++;
2118 return;
2119 }
2120 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
2121 ni->ni_noise = nf;
2122 ni->ni_intval = lintval;
2123 ni->ni_capinfo = capinfo;
2124 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell;
2125 ni->ni_fhindex = vap->iv_bss->ni_fhindex;
2126 /*
2127 * Store the IEs.
2128 * XXX maybe better to just expand
2129 */
2130 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) {
2131 #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off)
2132 if (wpa != NULL)
2133 setie(wpa_ie, wpa - sfrm);
2134 if (rsn != NULL)
2135 setie(rsn_ie, rsn - sfrm);
2136 if (htcap != NULL)
2137 setie(htcap_ie, htcap - sfrm);
2138 if (wme != NULL) {
2139 setie(wme_ie, wme - sfrm);
2140 /*
2141 * Mark node as capable of QoS.
2142 */
2143 ni->ni_flags |= IEEE80211_NODE_QOS;
2144 } else
2145 ni->ni_flags &= ~IEEE80211_NODE_QOS;
2146 #ifdef IEEE80211_SUPPORT_SUPERG
2147 if (ath != NULL) {
2148 setie(ath_ie, ath - sfrm);
2149 /*
2150 * Parse ATH station parameters.
2151 */
2152 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
2153 } else
2154 #endif
2155 ni->ni_ath_flags = 0;
2156 #undef setie
2157 } else {
2158 ni->ni_flags &= ~IEEE80211_NODE_QOS;
2159 ni->ni_ath_flags = 0;
2160 }
2161 ieee80211_node_join(ni, resp);
2162 ieee80211_deliver_l2uf(ni);
2163 break;
2164 }
2165
2166 case IEEE80211_FC0_SUBTYPE_DEAUTH:
2167 case IEEE80211_FC0_SUBTYPE_DISASSOC: {
2168 uint16_t reason;
2169
2170 if (vap->iv_state != IEEE80211_S_RUN ||
2171 /* NB: can happen when in promiscuous mode */
2172 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
2173 vap->iv_stats.is_rx_mgtdiscard++;
2174 break;
2175 }
2176 /*
2177 * deauth/disassoc frame format
2178 * [2] reason
2179 */
2180 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
2181 reason = le16toh(*(uint16_t *)frm);
2182 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) {
2183 vap->iv_stats.is_rx_deauth++;
2184 IEEE80211_NODE_STAT(ni, rx_deauth);
2185 } else {
2186 vap->iv_stats.is_rx_disassoc++;
2187 IEEE80211_NODE_STAT(ni, rx_disassoc);
2188 }
2189 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2190 "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >>
2191 IEEE80211_FC0_SUBTYPE_SHIFT], reason);
2192 if (ni != vap->iv_bss)
2193 ieee80211_node_leave(ni);
2194 break;
2195 }
2196
2197 case IEEE80211_FC0_SUBTYPE_ACTION:
2198 if (vap->iv_state == IEEE80211_S_RUN) {
2199 if (ieee80211_parse_action(ni, m0) == 0)
2200 ic->ic_recv_action(ni, wh, frm, efrm);
2201 } else
2202 vap->iv_stats.is_rx_mgtdiscard++;
2203 break;
2204
2205 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2206 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2207 default:
2208 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2209 wh, "mgt", "subtype 0x%x not handled", subtype);
2210 vap->iv_stats.is_rx_badsubtype++;
2211 break;
2212 }
2213 }
2214
2215 static void
2216 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
2217 {
2218 switch (subtype) {
2219 case IEEE80211_FC0_SUBTYPE_PS_POLL:
2220 hostap_recv_pspoll(ni, m);
2221 break;
2222 case IEEE80211_FC0_SUBTYPE_BAR:
2223 ieee80211_recv_bar(ni, m);
2224 break;
2225 }
2226 }
2227
2228 /*
2229 * Process a received ps-poll frame.
2230 */
2231 static void
2232 hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
2233 {
2234 struct ieee80211vap *vap = ni->ni_vap;
2235 struct ieee80211_frame_min *wh;
2236 struct ifnet *ifp;
2237 struct mbuf *m;
2238 uint16_t aid;
2239 int qlen;
2240
2241 wh = mtod(m0, struct ieee80211_frame_min *);
2242 if (ni->ni_associd == 0) {
2243 IEEE80211_DISCARD(vap,
2244 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2245 (struct ieee80211_frame *) wh, NULL,
2246 "%s", "unassociated station");
2247 vap->iv_stats.is_ps_unassoc++;
2248 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
2249 IEEE80211_REASON_NOT_ASSOCED);
2250 return;
2251 }
2252
2253 aid = le16toh(*(uint16_t *)wh->i_dur);
2254 if (aid != ni->ni_associd) {
2255 IEEE80211_DISCARD(vap,
2256 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2257 (struct ieee80211_frame *) wh, NULL,
2258 "aid mismatch: sta aid 0x%x poll aid 0x%x",
2259 ni->ni_associd, aid);
2260 vap->iv_stats.is_ps_badaid++;
2261 /*
2262 * NB: We used to deauth the station but it turns out
2263 * the Blackberry Curve 8230 (and perhaps other devices)
2264 * sometimes send the wrong AID when WME is negotiated.
2265 * Being more lenient here seems ok as we already check
2266 * the station is associated and we only return frames
2267 * queued for the station (i.e. we don't use the AID).
2268 */
2269 return;
2270 }
2271
2272 /* Okay, take the first queued packet and put it out... */
2273 m = ieee80211_node_psq_dequeue(ni, &qlen);
2274 if (m == NULL) {
2275 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2,
2276 "%s", "recv ps-poll, but queue empty");
2277 ieee80211_send_nulldata(ieee80211_ref_node(ni));
2278 vap->iv_stats.is_ps_qempty++; /* XXX node stat */
2279 if (vap->iv_set_tim != NULL)
2280 vap->iv_set_tim(ni, 0); /* just in case */
2281 return;
2282 }
2283 /*
2284 * If there are more packets, set the more packets bit
2285 * in the packet dispatched to the station; otherwise
2286 * turn off the TIM bit.
2287 */
2288 if (qlen != 0) {
2289 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2290 "recv ps-poll, send packet, %u still queued", qlen);
2291 m->m_flags |= M_MORE_DATA;
2292 } else {
2293 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2294 "%s", "recv ps-poll, send packet, queue empty");
2295 if (vap->iv_set_tim != NULL)
2296 vap->iv_set_tim(ni, 0);
2297 }
2298 m->m_flags |= M_PWR_SAV; /* bypass PS handling */
2299
2300 if (m->m_flags & M_ENCAP)
2301 ifp = vap->iv_ic->ic_ifp;
2302 else
2303 ifp = vap->iv_ifp;
2304 IF_ENQUEUE(&ifp->if_snd, m);
2305 if_start(ifp);
2306 }
Cache object: d9490ac3c7f4f0a56ced9f50d9c156b6
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