1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 /*
29 * IEEE 802.11 HOSTAP mode support.
30 */
31 #include "opt_inet.h"
32 #include "opt_wlan.h"
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/mbuf.h>
37 #include <sys/malloc.h>
38 #include <sys/kernel.h>
39 #include <sys/epoch.h>
40
41 #include <sys/socket.h>
42 #include <sys/sockio.h>
43 #include <sys/endian.h>
44 #include <sys/errno.h>
45 #include <sys/proc.h>
46 #include <sys/sysctl.h>
47
48 #include <net/if.h>
49 #include <net/if_var.h>
50 #include <net/if_media.h>
51 #include <net/if_llc.h>
52 #include <net/if_private.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 #include <net80211/ieee80211_vht.h>
65 #include <net80211/ieee80211_sta.h> /* for parse_wmeie */
66
67 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2)
68
69 static void hostap_vattach(struct ieee80211vap *);
70 static int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int);
71 static int hostap_input(struct ieee80211_node *ni, struct mbuf *m,
72 const struct ieee80211_rx_stats *,
73 int rssi, int nf);
74 static void hostap_deliver_data(struct ieee80211vap *,
75 struct ieee80211_node *, struct mbuf *);
76 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *,
77 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf);
78 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int);
79
80 void
ieee80211_hostap_attach(struct ieee80211com * ic)81 ieee80211_hostap_attach(struct ieee80211com *ic)
82 {
83 ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach;
84 }
85
86 void
ieee80211_hostap_detach(struct ieee80211com * ic)87 ieee80211_hostap_detach(struct ieee80211com *ic)
88 {
89 }
90
91 static void
hostap_vdetach(struct ieee80211vap * vap)92 hostap_vdetach(struct ieee80211vap *vap)
93 {
94 }
95
96 static void
hostap_vattach(struct ieee80211vap * vap)97 hostap_vattach(struct ieee80211vap *vap)
98 {
99 vap->iv_newstate = hostap_newstate;
100 vap->iv_input = hostap_input;
101 vap->iv_recv_mgmt = hostap_recv_mgmt;
102 vap->iv_recv_ctl = hostap_recv_ctl;
103 vap->iv_opdetach = hostap_vdetach;
104 vap->iv_deliver_data = hostap_deliver_data;
105 vap->iv_recv_pspoll = ieee80211_recv_pspoll;
106 }
107
108 static void
sta_disassoc(void * arg,struct ieee80211_node * ni)109 sta_disassoc(void *arg, struct ieee80211_node *ni)
110 {
111
112 if (ni->ni_associd != 0) {
113 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC,
114 IEEE80211_REASON_ASSOC_LEAVE);
115 ieee80211_node_leave(ni);
116 }
117 }
118
119 static void
sta_csa(void * arg,struct ieee80211_node * ni)120 sta_csa(void *arg, struct ieee80211_node *ni)
121 {
122 struct ieee80211vap *vap = ni->ni_vap;
123
124 if (ni->ni_associd != 0)
125 if (ni->ni_inact > vap->iv_inact_init) {
126 ni->ni_inact = vap->iv_inact_init;
127 IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
128 "%s: inact %u", __func__, ni->ni_inact);
129 }
130 }
131
132 static void
sta_drop(void * arg,struct ieee80211_node * ni)133 sta_drop(void *arg, struct ieee80211_node *ni)
134 {
135
136 if (ni->ni_associd != 0)
137 ieee80211_node_leave(ni);
138 }
139
140 /*
141 * Does a channel change require associated stations to re-associate
142 * so protocol state is correct. This is used when doing CSA across
143 * bands or similar (e.g. HT -> legacy).
144 */
145 static int
isbandchange(struct ieee80211com * ic)146 isbandchange(struct ieee80211com *ic)
147 {
148 return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) &
149 (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF |
150 IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0;
151 }
152
153 /*
154 * IEEE80211_M_HOSTAP vap state machine handler.
155 */
156 static int
hostap_newstate(struct ieee80211vap * vap,enum ieee80211_state nstate,int arg)157 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
158 {
159 struct ieee80211com *ic = vap->iv_ic;
160 enum ieee80211_state ostate;
161
162 IEEE80211_LOCK_ASSERT(ic);
163
164 ostate = vap->iv_state;
165 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
166 __func__, ieee80211_state_name[ostate],
167 ieee80211_state_name[nstate], arg);
168 vap->iv_state = nstate; /* state transition */
169 if (ostate != IEEE80211_S_SCAN)
170 ieee80211_cancel_scan(vap); /* background scan */
171 switch (nstate) {
172 case IEEE80211_S_INIT:
173 switch (ostate) {
174 case IEEE80211_S_SCAN:
175 ieee80211_cancel_scan(vap);
176 break;
177 case IEEE80211_S_CAC:
178 ieee80211_dfs_cac_stop(vap);
179 break;
180 case IEEE80211_S_RUN:
181 ieee80211_iterate_nodes_vap(&ic->ic_sta, vap,
182 sta_disassoc, NULL);
183 break;
184 default:
185 break;
186 }
187 if (ostate != IEEE80211_S_INIT) {
188 /* NB: optimize INIT -> INIT case */
189 ieee80211_reset_bss(vap);
190 }
191 if (vap->iv_auth->ia_detach != NULL)
192 vap->iv_auth->ia_detach(vap);
193 break;
194 case IEEE80211_S_SCAN:
195 switch (ostate) {
196 case IEEE80211_S_CSA:
197 case IEEE80211_S_RUN:
198 ieee80211_iterate_nodes_vap(&ic->ic_sta, vap,
199 sta_disassoc, NULL);
200 /*
201 * Clear overlapping BSS state; the beacon frame
202 * will be reconstructed on transition to the RUN
203 * state and the timeout routines check if the flag
204 * is set before doing anything so this is sufficient.
205 */
206 vap->iv_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
207 vap->iv_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
208 /* XXX TODO: schedule deferred update? */
209 /* fall thru... */
210 case IEEE80211_S_CAC:
211 /*
212 * NB: We may get here because of a manual channel
213 * change in which case we need to stop CAC
214 * XXX no need to stop if ostate RUN but it's ok
215 */
216 ieee80211_dfs_cac_stop(vap);
217 /* fall thru... */
218 case IEEE80211_S_INIT:
219 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
220 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
221 /*
222 * Already have a channel; bypass the
223 * scan and startup immediately.
224 * ieee80211_create_ibss will call back to
225 * move us to RUN state.
226 */
227 ieee80211_create_ibss(vap, vap->iv_des_chan);
228 break;
229 }
230 /*
231 * Initiate a scan. We can come here as a result
232 * of an IEEE80211_IOC_SCAN_REQ too in which case
233 * the vap will be marked with IEEE80211_FEXT_SCANREQ
234 * and the scan request parameters will be present
235 * in iv_scanreq. Otherwise we do the default.
236 */
237 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
238 ieee80211_check_scan(vap,
239 vap->iv_scanreq_flags,
240 vap->iv_scanreq_duration,
241 vap->iv_scanreq_mindwell,
242 vap->iv_scanreq_maxdwell,
243 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
244 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
245 } else
246 ieee80211_check_scan_current(vap);
247 break;
248 case IEEE80211_S_SCAN:
249 /*
250 * A state change requires a reset; scan.
251 */
252 ieee80211_check_scan_current(vap);
253 break;
254 default:
255 break;
256 }
257 break;
258 case IEEE80211_S_CAC:
259 /*
260 * Start CAC on a DFS channel. We come here when starting
261 * a bss on a DFS channel (see ieee80211_create_ibss).
262 */
263 ieee80211_dfs_cac_start(vap);
264 break;
265 case IEEE80211_S_RUN:
266 if (vap->iv_flags & IEEE80211_F_WPA) {
267 /* XXX validate prerequisites */
268 }
269 switch (ostate) {
270 case IEEE80211_S_INIT:
271 /*
272 * Already have a channel; bypass the
273 * scan and startup immediately.
274 * Note that ieee80211_create_ibss will call
275 * back to do a RUN->RUN state change.
276 */
277 ieee80211_create_ibss(vap,
278 ieee80211_ht_adjust_channel(ic,
279 ic->ic_curchan, vap->iv_flags_ht));
280 /* NB: iv_bss is changed on return */
281 break;
282 case IEEE80211_S_CAC:
283 /*
284 * NB: This is the normal state change when CAC
285 * expires and no radar was detected; no need to
286 * clear the CAC timer as it's already expired.
287 */
288 /* fall thru... */
289 case IEEE80211_S_CSA:
290 /*
291 * Shorten inactivity timer of associated stations
292 * to weed out sta's that don't follow a CSA.
293 */
294 ieee80211_iterate_nodes_vap(&ic->ic_sta, vap,
295 sta_csa, NULL);
296 /*
297 * Update bss node channel to reflect where
298 * we landed after CSA.
299 */
300 ieee80211_node_set_chan(vap->iv_bss,
301 ieee80211_ht_adjust_channel(ic, ic->ic_curchan,
302 ieee80211_htchanflags(vap->iv_bss->ni_chan)));
303 /* XXX bypass debug msgs */
304 break;
305 case IEEE80211_S_SCAN:
306 case IEEE80211_S_RUN:
307 #ifdef IEEE80211_DEBUG
308 if (ieee80211_msg_debug(vap)) {
309 struct ieee80211_node *ni = vap->iv_bss;
310 ieee80211_note(vap,
311 "synchronized with %s ssid ",
312 ether_sprintf(ni->ni_bssid));
313 ieee80211_print_essid(ni->ni_essid,
314 ni->ni_esslen);
315 /* XXX MCS/HT */
316 printf(" channel %d start %uMb\n",
317 ieee80211_chan2ieee(ic, ic->ic_curchan),
318 IEEE80211_RATE2MBS(ni->ni_txrate));
319 }
320 #endif
321 break;
322 default:
323 break;
324 }
325 /*
326 * Start/stop the authenticator. We delay until here
327 * to allow configuration to happen out of order.
328 */
329 if (vap->iv_auth->ia_attach != NULL) {
330 /* XXX check failure */
331 vap->iv_auth->ia_attach(vap);
332 } else if (vap->iv_auth->ia_detach != NULL) {
333 vap->iv_auth->ia_detach(vap);
334 }
335 ieee80211_node_authorize(vap->iv_bss);
336 break;
337 case IEEE80211_S_CSA:
338 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) {
339 /*
340 * On a ``band change'' silently drop associated
341 * stations as they must re-associate before they
342 * can pass traffic (as otherwise protocol state
343 * such as capabilities and the negotiated rate
344 * set may/will be wrong).
345 */
346 ieee80211_iterate_nodes_vap(&ic->ic_sta, vap,
347 sta_drop, NULL);
348 }
349 break;
350 default:
351 break;
352 }
353 return 0;
354 }
355
356 static void
hostap_deliver_data(struct ieee80211vap * vap,struct ieee80211_node * ni,struct mbuf * m)357 hostap_deliver_data(struct ieee80211vap *vap,
358 struct ieee80211_node *ni, struct mbuf *m)
359 {
360 struct ether_header *eh = mtod(m, struct ether_header *);
361 struct ifnet *ifp = vap->iv_ifp;
362
363 /* clear driver/net80211 flags before passing up */
364 m->m_flags &= ~(M_MCAST | M_BCAST);
365 m_clrprotoflags(m);
366
367 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP,
368 ("gack, opmode %d", vap->iv_opmode));
369 /*
370 * Do accounting.
371 */
372 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
373 IEEE80211_NODE_STAT(ni, rx_data);
374 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
375 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
376 m->m_flags |= M_MCAST; /* XXX M_BCAST? */
377 IEEE80211_NODE_STAT(ni, rx_mcast);
378 } else
379 IEEE80211_NODE_STAT(ni, rx_ucast);
380
381 /* perform as a bridge within the AP */
382 if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) {
383 struct mbuf *mcopy = NULL;
384
385 if (m->m_flags & M_MCAST) {
386 mcopy = m_dup(m, IEEE80211_M_NOWAIT);
387 if (mcopy == NULL)
388 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
389 else
390 mcopy->m_flags |= M_MCAST;
391 } else {
392 /*
393 * Check if the destination is associated with the
394 * same vap and authorized to receive traffic.
395 * Beware of traffic destined for the vap itself;
396 * sending it will not work; just let it be delivered
397 * normally.
398 */
399 struct ieee80211_node *sta = ieee80211_find_vap_node(
400 &vap->iv_ic->ic_sta, vap, eh->ether_dhost);
401 if (sta != NULL) {
402 if (ieee80211_node_is_authorized(sta)) {
403 /*
404 * Beware of sending to ourself; this
405 * needs to happen via the normal
406 * input path.
407 */
408 if (sta != vap->iv_bss) {
409 mcopy = m;
410 m = NULL;
411 }
412 } else {
413 vap->iv_stats.is_rx_unauth++;
414 IEEE80211_NODE_STAT(sta, rx_unauth);
415 }
416 ieee80211_free_node(sta);
417 }
418 }
419 if (mcopy != NULL)
420 (void) ieee80211_vap_xmitpkt(vap, mcopy);
421 }
422 if (m != NULL) {
423 struct epoch_tracker et;
424
425 /*
426 * Mark frame as coming from vap's interface.
427 */
428 m->m_pkthdr.rcvif = ifp;
429 if (m->m_flags & M_MCAST) {
430 /*
431 * Spam DWDS vap's w/ multicast traffic.
432 */
433 /* XXX only if dwds in use? */
434 ieee80211_dwds_mcast(vap, m);
435 }
436 if (ni->ni_vlan != 0) {
437 /* attach vlan tag */
438 m->m_pkthdr.ether_vtag = ni->ni_vlan;
439 m->m_flags |= M_VLANTAG;
440 }
441 NET_EPOCH_ENTER(et);
442 ifp->if_input(ifp, m);
443 NET_EPOCH_EXIT(et);
444 }
445 }
446
447 /*
448 * Decide if a received management frame should be
449 * printed when debugging is enabled. This filters some
450 * of the less interesting frames that come frequently
451 * (e.g. beacons).
452 */
453 static __inline int
doprint(struct ieee80211vap * vap,int subtype)454 doprint(struct ieee80211vap *vap, int subtype)
455 {
456 switch (subtype) {
457 case IEEE80211_FC0_SUBTYPE_BEACON:
458 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
459 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
460 return 0;
461 }
462 return 1;
463 }
464
465 /*
466 * Process a received frame. The node associated with the sender
467 * should be supplied. If nothing was found in the node table then
468 * the caller is assumed to supply a reference to iv_bss instead.
469 * The RSSI and a timestamp are also supplied. The RSSI data is used
470 * during AP scanning to select a AP to associate with; it can have
471 * any units so long as values have consistent units and higher values
472 * mean ``better signal''. The receive timestamp is currently not used
473 * by the 802.11 layer.
474 */
475 static int
hostap_input(struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_rx_stats * rxs,int rssi,int nf)476 hostap_input(struct ieee80211_node *ni, struct mbuf *m,
477 const struct ieee80211_rx_stats *rxs, int rssi, int nf)
478 {
479 struct ieee80211vap *vap = ni->ni_vap;
480 struct ieee80211com *ic = ni->ni_ic;
481 struct ifnet *ifp = vap->iv_ifp;
482 struct ieee80211_frame *wh;
483 struct ieee80211_key *key;
484 struct ether_header *eh;
485 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
486 uint8_t dir, type, subtype, qos;
487 uint8_t *bssid;
488 int is_hw_decrypted = 0;
489 int has_decrypted = 0;
490
491 /*
492 * Some devices do hardware decryption all the way through
493 * to pretending the frame wasn't encrypted in the first place.
494 * So, tag it appropriately so it isn't discarded inappropriately.
495 */
496 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED))
497 is_hw_decrypted = 1;
498
499 if (m->m_flags & M_AMPDU_MPDU) {
500 /*
501 * Fastpath for A-MPDU reorder q resubmission. Frames
502 * w/ M_AMPDU_MPDU marked have already passed through
503 * here but were received out of order and been held on
504 * the reorder queue. When resubmitted they are marked
505 * with the M_AMPDU_MPDU flag and we can bypass most of
506 * the normal processing.
507 */
508 wh = mtod(m, struct ieee80211_frame *);
509 type = IEEE80211_FC0_TYPE_DATA;
510 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
511 subtype = IEEE80211_FC0_SUBTYPE_QOS_DATA;
512 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
513 goto resubmit_ampdu;
514 }
515
516 KASSERT(ni != NULL, ("null node"));
517 ni->ni_inact = ni->ni_inact_reload;
518
519 type = -1; /* undefined */
520
521 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
522 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
523 ni->ni_macaddr, NULL,
524 "too short (1): len %u", m->m_pkthdr.len);
525 vap->iv_stats.is_rx_tooshort++;
526 goto out;
527 }
528 /*
529 * Bit of a cheat here, we use a pointer for a 3-address
530 * frame format but don't reference fields past outside
531 * ieee80211_frame_min w/o first validating the data is
532 * present.
533 */
534 wh = mtod(m, struct ieee80211_frame *);
535
536 if (!IEEE80211_IS_FC0_CHECK_VER(wh, IEEE80211_FC0_VERSION_0)) {
537 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
538 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
539 wh->i_fc[0], wh->i_fc[1]);
540 vap->iv_stats.is_rx_badversion++;
541 goto err;
542 }
543
544 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
545 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
546 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
547 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
548 if (dir != IEEE80211_FC1_DIR_NODS)
549 bssid = wh->i_addr1;
550 else if (type == IEEE80211_FC0_TYPE_CTL)
551 bssid = wh->i_addr1;
552 else {
553 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
554 IEEE80211_DISCARD_MAC(vap,
555 IEEE80211_MSG_ANY, ni->ni_macaddr,
556 NULL, "too short (2): len %u",
557 m->m_pkthdr.len);
558 vap->iv_stats.is_rx_tooshort++;
559 goto out;
560 }
561 bssid = wh->i_addr3;
562 }
563 /*
564 * Validate the bssid.
565 */
566 if (!(type == IEEE80211_FC0_TYPE_MGT &&
567 subtype == IEEE80211_FC0_SUBTYPE_BEACON) &&
568 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
569 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
570 /* not interested in */
571 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
572 bssid, NULL, "%s", "not to bss");
573 vap->iv_stats.is_rx_wrongbss++;
574 goto out;
575 }
576
577 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
578 ni->ni_noise = nf;
579 if (IEEE80211_HAS_SEQ(type, subtype)) {
580 uint8_t tid = ieee80211_gettid(wh);
581 if (IEEE80211_QOS_HAS_SEQ(wh) &&
582 TID_TO_WME_AC(tid) >= WME_AC_VI)
583 ic->ic_wme.wme_hipri_traffic++;
584 if (! ieee80211_check_rxseq(ni, wh, bssid, rxs))
585 goto out;
586 }
587 }
588
589 switch (type) {
590 case IEEE80211_FC0_TYPE_DATA:
591 hdrspace = ieee80211_hdrspace(ic, wh);
592 if (m->m_len < hdrspace &&
593 (m = m_pullup(m, hdrspace)) == NULL) {
594 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
595 ni->ni_macaddr, NULL,
596 "data too short: expecting %u", hdrspace);
597 vap->iv_stats.is_rx_tooshort++;
598 goto out; /* XXX */
599 }
600 if (!(dir == IEEE80211_FC1_DIR_TODS ||
601 (dir == IEEE80211_FC1_DIR_DSTODS &&
602 (vap->iv_flags & IEEE80211_F_DWDS)))) {
603 if (dir != IEEE80211_FC1_DIR_DSTODS) {
604 IEEE80211_DISCARD(vap,
605 IEEE80211_MSG_INPUT, wh, "data",
606 "incorrect dir 0x%x", dir);
607 } else {
608 IEEE80211_DISCARD(vap,
609 IEEE80211_MSG_INPUT |
610 IEEE80211_MSG_WDS, wh,
611 "4-address data",
612 "%s", "DWDS not enabled");
613 }
614 vap->iv_stats.is_rx_wrongdir++;
615 goto out;
616 }
617 /* check if source STA is associated */
618 if (ni == vap->iv_bss) {
619 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
620 wh, "data", "%s", "unknown src");
621 ieee80211_send_error(ni, wh->i_addr2,
622 IEEE80211_FC0_SUBTYPE_DEAUTH,
623 IEEE80211_REASON_NOT_AUTHED);
624 vap->iv_stats.is_rx_notassoc++;
625 goto err;
626 }
627 if (ni->ni_associd == 0) {
628 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
629 wh, "data", "%s", "unassoc src");
630 IEEE80211_SEND_MGMT(ni,
631 IEEE80211_FC0_SUBTYPE_DISASSOC,
632 IEEE80211_REASON_NOT_ASSOCED);
633 vap->iv_stats.is_rx_notassoc++;
634 goto err;
635 }
636
637 /*
638 * Check for power save state change.
639 * XXX out-of-order A-MPDU frames?
640 */
641 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^
642 (ni->ni_flags & IEEE80211_NODE_PWR_MGT)))
643 vap->iv_node_ps(ni,
644 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT);
645 /*
646 * For 4-address packets handle WDS discovery
647 * notifications. Once a WDS link is setup frames
648 * are just delivered to the WDS vap (see below).
649 */
650 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) {
651 if (!ieee80211_node_is_authorized(ni)) {
652 IEEE80211_DISCARD(vap,
653 IEEE80211_MSG_INPUT |
654 IEEE80211_MSG_WDS, wh,
655 "4-address data",
656 "%s", "unauthorized port");
657 vap->iv_stats.is_rx_unauth++;
658 IEEE80211_NODE_STAT(ni, rx_unauth);
659 goto err;
660 }
661 ieee80211_dwds_discover(ni, m);
662 return type;
663 }
664
665 /*
666 * Handle A-MPDU re-ordering. If the frame is to be
667 * processed directly then ieee80211_ampdu_reorder
668 * will return 0; otherwise it has consumed the mbuf
669 * and we should do nothing more with it.
670 */
671 if ((m->m_flags & M_AMPDU) &&
672 ieee80211_ampdu_reorder(ni, m, rxs) != 0) {
673 m = NULL;
674 goto out;
675 }
676 resubmit_ampdu:
677
678 /*
679 * Handle privacy requirements. Note that we
680 * must not be preempted from here until after
681 * we (potentially) call ieee80211_crypto_demic;
682 * otherwise we may violate assumptions in the
683 * crypto cipher modules used to do delayed update
684 * of replay sequence numbers.
685 */
686 if (is_hw_decrypted || IEEE80211_IS_PROTECTED(wh)) {
687 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
688 /*
689 * Discard encrypted frames when privacy is off.
690 */
691 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
692 wh, "WEP", "%s", "PRIVACY off");
693 vap->iv_stats.is_rx_noprivacy++;
694 IEEE80211_NODE_STAT(ni, rx_noprivacy);
695 goto out;
696 }
697 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
698 /* NB: stats+msgs handled in crypto_decap */
699 IEEE80211_NODE_STAT(ni, rx_wepfail);
700 goto out;
701 }
702 wh = mtod(m, struct ieee80211_frame *);
703 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
704 has_decrypted = 1;
705 } else {
706 /* XXX M_WEP and IEEE80211_F_PRIVACY */
707 key = NULL;
708 }
709
710 /*
711 * Save QoS bits for use below--before we strip the header.
712 */
713 if (subtype == IEEE80211_FC0_SUBTYPE_QOS_DATA)
714 qos = ieee80211_getqos(wh)[0];
715 else
716 qos = 0;
717
718 /*
719 * Next up, any fragmentation.
720 */
721 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
722 m = ieee80211_defrag(ni, m, hdrspace, has_decrypted);
723 if (m == NULL) {
724 /* Fragment dropped or frame not complete yet */
725 goto out;
726 }
727 }
728 wh = NULL; /* no longer valid, catch any uses */
729
730 /*
731 * Next strip any MSDU crypto bits.
732 */
733 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
734 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
735 ni->ni_macaddr, "data", "%s", "demic error");
736 vap->iv_stats.is_rx_demicfail++;
737 IEEE80211_NODE_STAT(ni, rx_demicfail);
738 goto out;
739 }
740 /* copy to listener after decrypt */
741 if (ieee80211_radiotap_active_vap(vap))
742 ieee80211_radiotap_rx(vap, m);
743 need_tap = 0;
744 /*
745 * Finally, strip the 802.11 header.
746 */
747 m = ieee80211_decap(vap, m, hdrspace, qos);
748 if (m == NULL) {
749 /* XXX mask bit to check for both */
750 /* don't count Null data frames as errors */
751 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
752 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
753 goto out;
754 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
755 ni->ni_macaddr, "data", "%s", "decap error");
756 vap->iv_stats.is_rx_decap++;
757 IEEE80211_NODE_STAT(ni, rx_decap);
758 goto err;
759 }
760 if (!(qos & IEEE80211_QOS_AMSDU))
761 eh = mtod(m, struct ether_header *);
762 else
763 eh = NULL;
764 if (!ieee80211_node_is_authorized(ni)) {
765 /*
766 * Deny any non-PAE frames received prior to
767 * authorization. For open/shared-key
768 * authentication the port is mark authorized
769 * after authentication completes. For 802.1x
770 * the port is not marked authorized by the
771 * authenticator until the handshake has completed.
772 */
773 if (eh == NULL ||
774 eh->ether_type != htons(ETHERTYPE_PAE)) {
775 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
776 ni->ni_macaddr, "data", "unauthorized or "
777 "unknown port: ether type 0x%x len %u",
778 eh == NULL ? -1 : eh->ether_type,
779 m->m_pkthdr.len);
780 vap->iv_stats.is_rx_unauth++;
781 IEEE80211_NODE_STAT(ni, rx_unauth);
782 goto err;
783 }
784 } else {
785 /*
786 * When denying unencrypted frames, discard
787 * any non-PAE frames received without encryption.
788 */
789 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
790 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
791 (is_hw_decrypted == 0) &&
792 (eh == NULL ||
793 eh->ether_type != htons(ETHERTYPE_PAE))) {
794 /*
795 * Drop unencrypted frames.
796 */
797 vap->iv_stats.is_rx_unencrypted++;
798 IEEE80211_NODE_STAT(ni, rx_unencrypted);
799 goto out;
800 }
801 }
802 /* XXX require HT? */
803 if (qos & IEEE80211_QOS_AMSDU) {
804 m = ieee80211_decap_amsdu(ni, m);
805 if (m == NULL)
806 return IEEE80211_FC0_TYPE_DATA;
807 } else {
808 #ifdef IEEE80211_SUPPORT_SUPERG
809 m = ieee80211_decap_fastframe(vap, ni, m);
810 if (m == NULL)
811 return IEEE80211_FC0_TYPE_DATA;
812 #endif
813 }
814 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
815 ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
816 else
817 hostap_deliver_data(vap, ni, m);
818 return IEEE80211_FC0_TYPE_DATA;
819
820 case IEEE80211_FC0_TYPE_MGT:
821 vap->iv_stats.is_rx_mgmt++;
822 IEEE80211_NODE_STAT(ni, rx_mgmt);
823 if (dir != IEEE80211_FC1_DIR_NODS) {
824 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
825 wh, "mgt", "incorrect dir 0x%x", dir);
826 vap->iv_stats.is_rx_wrongdir++;
827 goto err;
828 }
829 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
830 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
831 ni->ni_macaddr, "mgt", "too short: len %u",
832 m->m_pkthdr.len);
833 vap->iv_stats.is_rx_tooshort++;
834 goto out;
835 }
836 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
837 /* ensure return frames are unicast */
838 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
839 wh, NULL, "source is multicast: %s",
840 ether_sprintf(wh->i_addr2));
841 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */
842 goto out;
843 }
844 #ifdef IEEE80211_DEBUG
845 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
846 ieee80211_msg_dumppkts(vap)) {
847 if_printf(ifp, "received %s from %s rssi %d\n",
848 ieee80211_mgt_subtype_name(subtype),
849 ether_sprintf(wh->i_addr2), rssi);
850 }
851 #endif
852 if (IEEE80211_IS_PROTECTED(wh)) {
853 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
854 /*
855 * Only shared key auth frames with a challenge
856 * should be encrypted, discard all others.
857 */
858 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
859 wh, NULL,
860 "%s", "WEP set but not permitted");
861 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
862 goto out;
863 }
864 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
865 /*
866 * Discard encrypted frames when privacy is off.
867 */
868 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
869 wh, NULL, "%s", "WEP set but PRIVACY off");
870 vap->iv_stats.is_rx_noprivacy++;
871 goto out;
872 }
873 hdrspace = ieee80211_hdrspace(ic, wh);
874 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
875 /* NB: stats+msgs handled in crypto_decap */
876 goto out;
877 }
878 wh = mtod(m, struct ieee80211_frame *);
879 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
880 has_decrypted = 1;
881 }
882 /*
883 * Pass the packet to radiotap before calling iv_recv_mgmt().
884 * Otherwise iv_recv_mgmt() might pass another packet to
885 * radiotap, resulting in out of order packet captures.
886 */
887 if (ieee80211_radiotap_active_vap(vap))
888 ieee80211_radiotap_rx(vap, m);
889 need_tap = 0;
890 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
891 goto out;
892
893 case IEEE80211_FC0_TYPE_CTL:
894 vap->iv_stats.is_rx_ctl++;
895 IEEE80211_NODE_STAT(ni, rx_ctrl);
896 vap->iv_recv_ctl(ni, m, subtype);
897 goto out;
898 default:
899 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
900 wh, "bad", "frame type 0x%x", type);
901 /* should not come here */
902 break;
903 }
904 err:
905 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
906 out:
907 if (m != NULL) {
908 if (need_tap && ieee80211_radiotap_active_vap(vap))
909 ieee80211_radiotap_rx(vap, m);
910 m_freem(m);
911 }
912 return type;
913 }
914
915 static void
hostap_auth_open(struct ieee80211_node * ni,struct ieee80211_frame * wh,int rssi,int nf,uint16_t seq,uint16_t status)916 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
917 int rssi, int nf, uint16_t seq, uint16_t status)
918 {
919 struct ieee80211vap *vap = ni->ni_vap;
920
921 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
922
923 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
924 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
925 ni->ni_macaddr, "open auth",
926 "bad sta auth mode %u", ni->ni_authmode);
927 vap->iv_stats.is_rx_bad_auth++; /* XXX */
928 /*
929 * Clear any challenge text that may be there if
930 * a previous shared key auth failed and then an
931 * open auth is attempted.
932 */
933 if (ni->ni_challenge != NULL) {
934 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
935 ni->ni_challenge = NULL;
936 }
937 /* XXX hack to workaround calling convention */
938 ieee80211_send_error(ni, wh->i_addr2,
939 IEEE80211_FC0_SUBTYPE_AUTH,
940 (seq + 1) | (IEEE80211_STATUS_ALG<<16));
941 return;
942 }
943 if (seq != IEEE80211_AUTH_OPEN_REQUEST) {
944 vap->iv_stats.is_rx_bad_auth++;
945 return;
946 }
947 /* always accept open authentication requests */
948 if (ni == vap->iv_bss) {
949 ni = ieee80211_dup_bss(vap, wh->i_addr2);
950 if (ni == NULL)
951 return;
952 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
953 (void) ieee80211_ref_node(ni);
954 /*
955 * Mark the node as referenced to reflect that it's
956 * reference count has been bumped to insure it remains
957 * after the transaction completes.
958 */
959 ni->ni_flags |= IEEE80211_NODE_AREF;
960 /*
961 * Mark the node as requiring a valid association id
962 * before outbound traffic is permitted.
963 */
964 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
965
966 if (vap->iv_acl != NULL &&
967 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
968 /*
969 * When the ACL policy is set to RADIUS we defer the
970 * authorization to a user agent. Dispatch an event,
971 * a subsequent MLME call will decide the fate of the
972 * station. If the user agent is not present then the
973 * node will be reclaimed due to inactivity.
974 */
975 IEEE80211_NOTE_MAC(vap,
976 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr,
977 "%s", "station authentication deferred (radius acl)");
978 ieee80211_notify_node_auth(ni);
979 } else {
980 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
981 IEEE80211_NOTE_MAC(vap,
982 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr,
983 "%s", "station authenticated (open)");
984 /*
985 * When 802.1x is not in use mark the port
986 * authorized at this point so traffic can flow.
987 */
988 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
989 ieee80211_node_authorize(ni);
990 }
991 }
992
993 static void
hostap_auth_shared(struct ieee80211_node * ni,struct ieee80211_frame * wh,uint8_t * frm,uint8_t * efrm,int rssi,int nf,uint16_t seq,uint16_t status)994 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
995 uint8_t *frm, uint8_t *efrm, int rssi, int nf,
996 uint16_t seq, uint16_t status)
997 {
998 struct ieee80211vap *vap = ni->ni_vap;
999 uint8_t *challenge;
1000 int estatus;
1001
1002 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
1003
1004 /*
1005 * NB: this can happen as we allow pre-shared key
1006 * authentication to be enabled w/o wep being turned
1007 * on so that configuration of these can be done
1008 * in any order. It may be better to enforce the
1009 * ordering in which case this check would just be
1010 * for sanity/consistency.
1011 */
1012 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1013 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1014 ni->ni_macaddr, "shared key auth",
1015 "%s", " PRIVACY is disabled");
1016 estatus = IEEE80211_STATUS_ALG;
1017 goto bad;
1018 }
1019 /*
1020 * Pre-shared key authentication is evil; accept
1021 * it only if explicitly configured (it is supported
1022 * mainly for compatibility with clients like Mac OS X).
1023 */
1024 if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1025 ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1026 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1027 ni->ni_macaddr, "shared key auth",
1028 "bad sta auth mode %u", ni->ni_authmode);
1029 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1030 estatus = IEEE80211_STATUS_ALG;
1031 goto bad;
1032 }
1033
1034 challenge = NULL;
1035 if (frm + 1 < efrm) {
1036 if ((frm[1] + 2) > (efrm - frm)) {
1037 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1038 ni->ni_macaddr, "shared key auth",
1039 "ie %d/%d too long",
1040 frm[0], (frm[1] + 2) - (efrm - frm));
1041 vap->iv_stats.is_rx_bad_auth++;
1042 estatus = IEEE80211_STATUS_CHALLENGE;
1043 goto bad;
1044 }
1045 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1046 challenge = frm;
1047 frm += frm[1] + 2;
1048 }
1049 switch (seq) {
1050 case IEEE80211_AUTH_SHARED_CHALLENGE:
1051 case IEEE80211_AUTH_SHARED_RESPONSE:
1052 if (challenge == NULL) {
1053 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1054 ni->ni_macaddr, "shared key auth",
1055 "%s", "no challenge");
1056 vap->iv_stats.is_rx_bad_auth++;
1057 estatus = IEEE80211_STATUS_CHALLENGE;
1058 goto bad;
1059 }
1060 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1061 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1062 ni->ni_macaddr, "shared key auth",
1063 "bad challenge len %d", challenge[1]);
1064 vap->iv_stats.is_rx_bad_auth++;
1065 estatus = IEEE80211_STATUS_CHALLENGE;
1066 goto bad;
1067 }
1068 default:
1069 break;
1070 }
1071 switch (seq) {
1072 case IEEE80211_AUTH_SHARED_REQUEST:
1073 {
1074 #ifdef IEEE80211_DEBUG
1075 bool allocbs;
1076 #endif
1077
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 #ifdef IEEE80211_DEBUG
1085 allocbs = 1;
1086 #endif
1087 } else {
1088 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
1089 (void) ieee80211_ref_node(ni);
1090 #ifdef IEEE80211_DEBUG
1091 allocbs = 0;
1092 #endif
1093 }
1094 /*
1095 * Mark the node as referenced to reflect that it's
1096 * reference count has been bumped to insure it remains
1097 * after the transaction completes.
1098 */
1099 ni->ni_flags |= IEEE80211_NODE_AREF;
1100 /*
1101 * Mark the node as requiring a valid association id
1102 * before outbound traffic is permitted.
1103 */
1104 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
1105 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
1106 ni->ni_noise = nf;
1107 if (!ieee80211_alloc_challenge(ni)) {
1108 /* NB: don't return error so they rexmit */
1109 return;
1110 }
1111 net80211_get_random_bytes(ni->ni_challenge,
1112 IEEE80211_CHALLENGE_LEN);
1113 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1114 ni, "shared key %sauth request", allocbs ? "" : "re");
1115 /*
1116 * When the ACL policy is set to RADIUS we defer the
1117 * authorization to a user agent. Dispatch an event,
1118 * a subsequent MLME call will decide the fate of the
1119 * station. If the user agent is not present then the
1120 * node will be reclaimed due to inactivity.
1121 */
1122 if (vap->iv_acl != NULL &&
1123 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
1124 IEEE80211_NOTE_MAC(vap,
1125 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL,
1126 ni->ni_macaddr,
1127 "%s", "station authentication deferred (radius acl)");
1128 ieee80211_notify_node_auth(ni);
1129 return;
1130 }
1131 break;
1132 }
1133 case IEEE80211_AUTH_SHARED_RESPONSE:
1134 if (ni == vap->iv_bss) {
1135 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1136 ni->ni_macaddr, "shared key response",
1137 "%s", "unknown station");
1138 /* NB: don't send a response */
1139 return;
1140 }
1141 if (ni->ni_challenge == NULL) {
1142 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1143 ni->ni_macaddr, "shared key response",
1144 "%s", "no challenge recorded");
1145 vap->iv_stats.is_rx_bad_auth++;
1146 estatus = IEEE80211_STATUS_CHALLENGE;
1147 goto bad;
1148 }
1149 if (memcmp(ni->ni_challenge, &challenge[2],
1150 challenge[1]) != 0) {
1151 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1152 ni->ni_macaddr, "shared key response",
1153 "%s", "challenge mismatch");
1154 vap->iv_stats.is_rx_auth_fail++;
1155 estatus = IEEE80211_STATUS_CHALLENGE;
1156 goto bad;
1157 }
1158 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1159 ni, "%s", "station authenticated (shared key)");
1160 ieee80211_node_authorize(ni);
1161 break;
1162 default:
1163 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1164 ni->ni_macaddr, "shared key auth",
1165 "bad seq %d", seq);
1166 vap->iv_stats.is_rx_bad_auth++;
1167 estatus = IEEE80211_STATUS_SEQUENCE;
1168 goto bad;
1169 }
1170 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1171 return;
1172 bad:
1173 /*
1174 * Send an error response; but only when operating as an AP.
1175 */
1176 /* XXX hack to workaround calling convention */
1177 ieee80211_send_error(ni, wh->i_addr2,
1178 IEEE80211_FC0_SUBTYPE_AUTH,
1179 (seq + 1) | (estatus<<16));
1180 }
1181
1182 /*
1183 * Convert a WPA cipher selector OUI to an internal
1184 * cipher algorithm. Where appropriate we also
1185 * record any key length.
1186 */
1187 static int
wpa_cipher(const uint8_t * sel,uint8_t * keylen,uint8_t * cipher)1188 wpa_cipher(const uint8_t *sel, uint8_t *keylen, uint8_t *cipher)
1189 {
1190 #define WPA_SEL(x) (((x)<<24)|WPA_OUI)
1191 uint32_t w = le32dec(sel);
1192
1193 switch (w) {
1194 case WPA_SEL(WPA_CSE_NULL):
1195 *cipher = IEEE80211_CIPHER_NONE;
1196 break;
1197 case WPA_SEL(WPA_CSE_WEP40):
1198 if (keylen)
1199 *keylen = 40 / NBBY;
1200 *cipher = IEEE80211_CIPHER_WEP;
1201 break;
1202 case WPA_SEL(WPA_CSE_WEP104):
1203 if (keylen)
1204 *keylen = 104 / NBBY;
1205 *cipher = IEEE80211_CIPHER_WEP;
1206 break;
1207 case WPA_SEL(WPA_CSE_TKIP):
1208 *cipher = IEEE80211_CIPHER_TKIP;
1209 break;
1210 case WPA_SEL(WPA_CSE_CCMP):
1211 *cipher = IEEE80211_CIPHER_AES_CCM;
1212 break;
1213 default:
1214 return (EINVAL);
1215 }
1216
1217 return (0);
1218 #undef WPA_SEL
1219 }
1220
1221 /*
1222 * Convert a WPA key management/authentication algorithm
1223 * to an internal code.
1224 */
1225 static int
wpa_keymgmt(const uint8_t * sel)1226 wpa_keymgmt(const uint8_t *sel)
1227 {
1228 #define WPA_SEL(x) (((x)<<24)|WPA_OUI)
1229 uint32_t w = le32dec(sel);
1230
1231 switch (w) {
1232 case WPA_SEL(WPA_ASE_8021X_UNSPEC):
1233 return WPA_ASE_8021X_UNSPEC;
1234 case WPA_SEL(WPA_ASE_8021X_PSK):
1235 return WPA_ASE_8021X_PSK;
1236 case WPA_SEL(WPA_ASE_NONE):
1237 return WPA_ASE_NONE;
1238 }
1239 return 0; /* NB: so is discarded */
1240 #undef WPA_SEL
1241 }
1242
1243 /*
1244 * Parse a WPA information element to collect parameters.
1245 * Note that we do not validate security parameters; that
1246 * is handled by the authenticator; the parsing done here
1247 * is just for internal use in making operational decisions.
1248 */
1249 static int
ieee80211_parse_wpa(struct ieee80211vap * vap,const uint8_t * frm,struct ieee80211_rsnparms * rsn,const struct ieee80211_frame * wh)1250 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm,
1251 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1252 {
1253 uint8_t len = frm[1];
1254 uint32_t w;
1255 int error, n;
1256
1257 /*
1258 * Check the length once for fixed parts: OUI, type,
1259 * version, mcast cipher, and 2 selector counts.
1260 * Other, variable-length data, must be checked separately.
1261 */
1262 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) {
1263 IEEE80211_DISCARD_IE(vap,
1264 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1265 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags);
1266 return IEEE80211_REASON_IE_INVALID;
1267 }
1268 if (len < 14) {
1269 IEEE80211_DISCARD_IE(vap,
1270 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1271 wh, "WPA", "too short, len %u", len);
1272 return IEEE80211_REASON_IE_INVALID;
1273 }
1274 frm += 6, len -= 4; /* NB: len is payload only */
1275 /* NB: iswpaoui already validated the OUI and type */
1276 w = le16dec(frm);
1277 if (w != WPA_VERSION) {
1278 IEEE80211_DISCARD_IE(vap,
1279 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1280 wh, "WPA", "bad version %u", w);
1281 return IEEE80211_REASON_IE_INVALID;
1282 }
1283 frm += 2, len -= 2;
1284
1285 memset(rsn, 0, sizeof(*rsn));
1286
1287 /* multicast/group cipher */
1288 error = wpa_cipher(frm, &rsn->rsn_mcastkeylen, &rsn->rsn_mcastcipher);
1289 if (error != 0) {
1290 IEEE80211_DISCARD_IE(vap,
1291 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1292 wh, "WPA", "unknown mcast cipher suite %08X",
1293 le32dec(frm));
1294 return IEEE80211_REASON_GROUP_CIPHER_INVALID;
1295 }
1296 frm += 4, len -= 4;
1297
1298 /* unicast ciphers */
1299 n = le16dec(frm);
1300 frm += 2, len -= 2;
1301 if (len < n*4+2) {
1302 IEEE80211_DISCARD_IE(vap,
1303 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1304 wh, "WPA", "ucast cipher 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 uint8_t cipher;
1311
1312 error = wpa_cipher(frm, &rsn->rsn_ucastkeylen, &cipher);
1313 if (error == 0)
1314 w |= 1 << cipher;
1315
1316 frm += 4, len -= 4;
1317 }
1318 if (w == 0) {
1319 IEEE80211_DISCARD_IE(vap,
1320 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1321 wh, "WPA", "no usable pairwise cipher suite found (w=%d)",
1322 w);
1323 return IEEE80211_REASON_PAIRWISE_CIPHER_INVALID;
1324 }
1325 /* XXX other? */
1326 if (w & (1 << IEEE80211_CIPHER_AES_CCM))
1327 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1328 else
1329 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1330
1331 /* key management algorithms */
1332 n = le16dec(frm);
1333 frm += 2, len -= 2;
1334 if (len < n*4) {
1335 IEEE80211_DISCARD_IE(vap,
1336 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1337 wh, "WPA", "key mgmt alg data too short; len %u, n %u",
1338 len, n);
1339 return IEEE80211_REASON_IE_INVALID;
1340 }
1341 w = 0;
1342 for (; n > 0; n--) {
1343 w |= wpa_keymgmt(frm);
1344 frm += 4, len -= 4;
1345 }
1346 if (w & WPA_ASE_8021X_UNSPEC)
1347 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC;
1348 else
1349 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
1350
1351 if (len > 2) /* optional capabilities */
1352 rsn->rsn_caps = le16dec(frm);
1353
1354 return 0;
1355 }
1356
1357 /*
1358 * Convert an RSN cipher selector OUI to an internal
1359 * cipher algorithm. Where appropriate we also
1360 * record any key length.
1361 */
1362 static int
rsn_cipher(const uint8_t * sel,uint8_t * keylen,uint8_t * cipher)1363 rsn_cipher(const uint8_t *sel, uint8_t *keylen, uint8_t *cipher)
1364 {
1365 #define RSN_SEL(x) (((x)<<24)|RSN_OUI)
1366 uint32_t w = le32dec(sel);
1367
1368 switch (w) {
1369 case RSN_SEL(RSN_CSE_NULL):
1370 *cipher = IEEE80211_CIPHER_NONE;
1371 break;
1372 case RSN_SEL(RSN_CSE_WEP40):
1373 if (keylen)
1374 *keylen = 40 / NBBY;
1375 *cipher = IEEE80211_CIPHER_WEP;
1376 break;
1377 case RSN_SEL(RSN_CSE_WEP104):
1378 if (keylen)
1379 *keylen = 104 / NBBY;
1380 *cipher = IEEE80211_CIPHER_WEP;
1381 break;
1382 case RSN_SEL(RSN_CSE_TKIP):
1383 *cipher = IEEE80211_CIPHER_TKIP;
1384 break;
1385 case RSN_SEL(RSN_CSE_CCMP):
1386 *cipher = IEEE80211_CIPHER_AES_CCM;
1387 break;
1388 case RSN_SEL(RSN_CSE_WRAP):
1389 *cipher = IEEE80211_CIPHER_AES_OCB;
1390 break;
1391 default:
1392 return (EINVAL);
1393 }
1394
1395 return (0);
1396 #undef WPA_SEL
1397 }
1398
1399 /*
1400 * Convert an RSN key management/authentication algorithm
1401 * to an internal code.
1402 */
1403 static int
rsn_keymgmt(const uint8_t * sel)1404 rsn_keymgmt(const uint8_t *sel)
1405 {
1406 #define RSN_SEL(x) (((x)<<24)|RSN_OUI)
1407 uint32_t w = le32dec(sel);
1408
1409 switch (w) {
1410 case RSN_SEL(RSN_ASE_8021X_UNSPEC):
1411 return RSN_ASE_8021X_UNSPEC;
1412 case RSN_SEL(RSN_ASE_8021X_PSK):
1413 return RSN_ASE_8021X_PSK;
1414 case RSN_SEL(RSN_ASE_NONE):
1415 return RSN_ASE_NONE;
1416 }
1417 return 0; /* NB: so is discarded */
1418 #undef RSN_SEL
1419 }
1420
1421 /*
1422 * Parse a WPA/RSN information element to collect parameters
1423 * and validate the parameters against what has been
1424 * configured for the system.
1425 */
1426 static int
ieee80211_parse_rsn(struct ieee80211vap * vap,const uint8_t * frm,struct ieee80211_rsnparms * rsn,const struct ieee80211_frame * wh)1427 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm,
1428 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1429 {
1430 uint8_t len = frm[1];
1431 uint32_t w;
1432 int error, n;
1433
1434 /*
1435 * Check the length once for fixed parts:
1436 * version, mcast cipher, and 2 selector counts.
1437 * Other, variable-length data, must be checked separately.
1438 */
1439 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) {
1440 IEEE80211_DISCARD_IE(vap,
1441 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1442 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags);
1443 return IEEE80211_REASON_IE_INVALID;
1444 }
1445 /* XXX may be shorter */
1446 if (len < 10) {
1447 IEEE80211_DISCARD_IE(vap,
1448 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1449 wh, "RSN", "too short, len %u", len);
1450 return IEEE80211_REASON_IE_INVALID;
1451 }
1452 frm += 2;
1453 w = le16dec(frm);
1454 if (w != RSN_VERSION) {
1455 IEEE80211_DISCARD_IE(vap,
1456 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1457 wh, "RSN", "bad version %u", w);
1458 return IEEE80211_REASON_UNSUPP_RSN_IE_VERSION;
1459 }
1460 frm += 2, len -= 2;
1461
1462 memset(rsn, 0, sizeof(*rsn));
1463
1464 /* multicast/group cipher */
1465 error = rsn_cipher(frm, &rsn->rsn_mcastkeylen, &rsn->rsn_mcastcipher);
1466 if (error != 0) {
1467 IEEE80211_DISCARD_IE(vap,
1468 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1469 wh, "RSN", "unknown mcast cipher suite %08X",
1470 le32dec(frm));
1471 return IEEE80211_REASON_GROUP_CIPHER_INVALID;
1472 }
1473 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_NONE) {
1474 IEEE80211_DISCARD_IE(vap,
1475 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1476 wh, "RSN", "invalid mcast cipher suite %d",
1477 rsn->rsn_mcastcipher);
1478 return IEEE80211_REASON_GROUP_CIPHER_INVALID;
1479 }
1480 frm += 4, len -= 4;
1481
1482 /* unicast ciphers */
1483 n = le16dec(frm);
1484 frm += 2, len -= 2;
1485 if (len < n*4+2) {
1486 IEEE80211_DISCARD_IE(vap,
1487 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1488 wh, "RSN", "ucast cipher data too short; len %u, n %u",
1489 len, n);
1490 return IEEE80211_REASON_IE_INVALID;
1491 }
1492 w = 0;
1493
1494 for (; n > 0; n--) {
1495 uint8_t cipher;
1496
1497 error = rsn_cipher(frm, &rsn->rsn_ucastkeylen, &cipher);
1498 if (error == 0)
1499 w |= 1 << cipher;
1500
1501 frm += 4, len -= 4;
1502 }
1503 if (w & (1 << IEEE80211_CIPHER_AES_CCM))
1504 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1505 else if (w & (1 << IEEE80211_CIPHER_AES_OCB))
1506 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_OCB;
1507 else if (w & (1 << IEEE80211_CIPHER_TKIP))
1508 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1509 else if ((w & (1 << IEEE80211_CIPHER_NONE)) &&
1510 (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP ||
1511 rsn->rsn_mcastcipher == IEEE80211_CIPHER_TKIP))
1512 rsn->rsn_ucastcipher = IEEE80211_CIPHER_NONE;
1513 else {
1514 IEEE80211_DISCARD_IE(vap,
1515 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1516 wh, "RSN", "no usable pairwise cipher suite found (w=%d)",
1517 w);
1518 return IEEE80211_REASON_PAIRWISE_CIPHER_INVALID;
1519 }
1520
1521 /* key management algorithms */
1522 n = le16dec(frm);
1523 frm += 2, len -= 2;
1524 if (len < n*4) {
1525 IEEE80211_DISCARD_IE(vap,
1526 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1527 wh, "RSN", "key mgmt alg data too short; len %u, n %u",
1528 len, n);
1529 return IEEE80211_REASON_IE_INVALID;
1530 }
1531 w = 0;
1532 for (; n > 0; n--) {
1533 w |= rsn_keymgmt(frm);
1534 frm += 4, len -= 4;
1535 }
1536 if (w & RSN_ASE_8021X_UNSPEC)
1537 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC;
1538 else
1539 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK;
1540
1541 /* optional RSN capabilities */
1542 if (len >= 2) {
1543 rsn->rsn_caps = le16dec(frm);
1544 frm += 2, len -= 2;
1545 }
1546
1547 /* XXX PMK Count / PMKID */
1548
1549 /* XXX Group Cipher Management Suite */
1550
1551 return 0;
1552 }
1553
1554 /*
1555 * WPA/802.11i association request processing.
1556 */
1557 static int
wpa_assocreq(struct ieee80211_node * ni,struct ieee80211_rsnparms * rsnparms,const struct ieee80211_frame * wh,const uint8_t * wpa,const uint8_t * rsn,uint16_t capinfo)1558 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms,
1559 const struct ieee80211_frame *wh, const uint8_t *wpa,
1560 const uint8_t *rsn, uint16_t capinfo)
1561 {
1562 struct ieee80211vap *vap = ni->ni_vap;
1563 uint8_t reason;
1564 int badwparsn;
1565
1566 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN);
1567 if (wpa == NULL && rsn == NULL) {
1568 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) {
1569 /*
1570 * W-Fi Protected Setup (WPS) permits
1571 * clients to associate and pass EAPOL frames
1572 * to establish initial credentials.
1573 */
1574 ni->ni_flags |= IEEE80211_NODE_WPS;
1575 return 1;
1576 }
1577 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) &&
1578 (capinfo & IEEE80211_CAPINFO_PRIVACY)) {
1579 /*
1580 * Transitional Security Network. Permits clients
1581 * to associate and use WEP while WPA is configured.
1582 */
1583 ni->ni_flags |= IEEE80211_NODE_TSN;
1584 return 1;
1585 }
1586 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1587 wh, NULL, "%s", "no WPA/RSN IE in association request");
1588 vap->iv_stats.is_rx_assoc_badwpaie++;
1589 reason = IEEE80211_REASON_IE_INVALID;
1590 goto bad;
1591 }
1592 /* assert right association security credentials */
1593 badwparsn = 0; /* NB: to silence compiler */
1594 switch (vap->iv_flags & IEEE80211_F_WPA) {
1595 case IEEE80211_F_WPA1:
1596 badwparsn = (wpa == NULL);
1597 break;
1598 case IEEE80211_F_WPA2:
1599 badwparsn = (rsn == NULL);
1600 break;
1601 case IEEE80211_F_WPA1|IEEE80211_F_WPA2:
1602 badwparsn = (wpa == NULL && rsn == NULL);
1603 break;
1604 }
1605 if (badwparsn) {
1606 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1607 wh, NULL,
1608 "%s", "missing WPA/RSN IE in association request");
1609 vap->iv_stats.is_rx_assoc_badwpaie++;
1610 reason = IEEE80211_REASON_IE_INVALID;
1611 goto bad;
1612 }
1613 /*
1614 * Parse WPA/RSN information element.
1615 */
1616 if (wpa != NULL)
1617 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh);
1618 else
1619 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh);
1620 if (reason != 0) {
1621 /* XXX wpa->rsn fallback? */
1622 /* XXX distinguish WPA/RSN? */
1623 vap->iv_stats.is_rx_assoc_badwpaie++;
1624 goto bad;
1625 }
1626 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni,
1627 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x",
1628 wpa != NULL ? "WPA" : "RSN",
1629 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen,
1630 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen,
1631 rsnparms->rsn_keymgmt, rsnparms->rsn_caps);
1632
1633 return 1;
1634 bad:
1635 ieee80211_node_deauth(ni, reason);
1636 return 0;
1637 }
1638
1639 /* XXX find a better place for definition */
1640 struct l2_update_frame {
1641 struct ether_header eh;
1642 uint8_t dsap;
1643 uint8_t ssap;
1644 uint8_t control;
1645 uint8_t xid[3];
1646 } __packed;
1647
1648 /*
1649 * Deliver a TGf L2UF frame on behalf of a station.
1650 * This primes any bridge when the station is roaming
1651 * between ap's on the same wired network.
1652 */
1653 static void
ieee80211_deliver_l2uf(struct ieee80211_node * ni)1654 ieee80211_deliver_l2uf(struct ieee80211_node *ni)
1655 {
1656 struct ieee80211vap *vap = ni->ni_vap;
1657 struct ifnet *ifp = vap->iv_ifp;
1658 struct mbuf *m;
1659 struct l2_update_frame *l2uf;
1660 struct ether_header *eh;
1661
1662 m = m_gethdr(IEEE80211_M_NOWAIT, MT_DATA);
1663 if (m == NULL) {
1664 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1665 "%s", "no mbuf for l2uf frame");
1666 vap->iv_stats.is_rx_nobuf++; /* XXX not right */
1667 return;
1668 }
1669 l2uf = mtod(m, struct l2_update_frame *);
1670 eh = &l2uf->eh;
1671 /* dst: Broadcast address */
1672 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr);
1673 /* src: associated STA */
1674 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr);
1675 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh));
1676
1677 l2uf->dsap = 0;
1678 l2uf->ssap = 0;
1679 l2uf->control = 0xf5;
1680 l2uf->xid[0] = 0x81;
1681 l2uf->xid[1] = 0x80;
1682 l2uf->xid[2] = 0x00;
1683
1684 m->m_pkthdr.len = m->m_len = sizeof(*l2uf);
1685 hostap_deliver_data(vap, ni, m);
1686 }
1687
1688 static void
ratesetmismatch(struct ieee80211_node * ni,const struct ieee80211_frame * wh,int reassoc,int resp,const char * tag,int rate)1689 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1690 int reassoc, int resp, const char *tag, int rate)
1691 {
1692 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1693 "deny %s request, %s rate set mismatch, rate/MCS %d",
1694 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL);
1695 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE);
1696 ieee80211_node_leave(ni);
1697 }
1698
1699 static void
capinfomismatch(struct ieee80211_node * ni,const struct ieee80211_frame * wh,int reassoc,int resp,const char * tag,int capinfo)1700 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1701 int reassoc, int resp, const char *tag, int capinfo)
1702 {
1703 struct ieee80211vap *vap = ni->ni_vap;
1704
1705 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1706 "deny %s request, %s mismatch 0x%x",
1707 reassoc ? "reassoc" : "assoc", tag, capinfo);
1708 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO);
1709 ieee80211_node_leave(ni);
1710 vap->iv_stats.is_rx_assoc_capmismatch++;
1711 }
1712
1713 static void
htcapmismatch(struct ieee80211_node * ni,const struct ieee80211_frame * wh,int reassoc,int resp)1714 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1715 int reassoc, int resp)
1716 {
1717 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1718 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc");
1719 /* XXX no better code */
1720 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS);
1721 ieee80211_node_leave(ni);
1722 }
1723
1724 static void
authalgreject(struct ieee80211_node * ni,const struct ieee80211_frame * wh,int algo,int seq,int status)1725 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1726 int algo, int seq, int status)
1727 {
1728 struct ieee80211vap *vap = ni->ni_vap;
1729
1730 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1731 wh, NULL, "unsupported alg %d", algo);
1732 vap->iv_stats.is_rx_auth_unsupported++;
1733 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH,
1734 seq | (status << 16));
1735 }
1736
1737 static __inline int
ishtmixed(const uint8_t * ie)1738 ishtmixed(const uint8_t *ie)
1739 {
1740 const struct ieee80211_ie_htinfo *ht =
1741 (const struct ieee80211_ie_htinfo *) ie;
1742 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) ==
1743 IEEE80211_HTINFO_OPMODE_MIXED;
1744 }
1745
1746 static int
is11bclient(const uint8_t * rates,const uint8_t * xrates)1747 is11bclient(const uint8_t *rates, const uint8_t *xrates)
1748 {
1749 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
1750 int i;
1751
1752 /* NB: the 11b clients we care about will not have xrates */
1753 if (xrates != NULL || rates == NULL)
1754 return 0;
1755 for (i = 0; i < rates[1]; i++) {
1756 int r = rates[2+i] & IEEE80211_RATE_VAL;
1757 if (r > 2*11 || ((1<<r) & brates) == 0)
1758 return 0;
1759 }
1760 return 1;
1761 }
1762
1763 static void
hostap_recv_mgmt(struct ieee80211_node * ni,struct mbuf * m0,int subtype,const struct ieee80211_rx_stats * rxs,int rssi,int nf)1764 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1765 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
1766 {
1767 struct ieee80211vap *vap = ni->ni_vap;
1768 struct ieee80211com *ic = ni->ni_ic;
1769 struct ieee80211_frame *wh;
1770 uint8_t *frm, *efrm, *sfrm;
1771 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap;
1772 uint8_t *vhtcap, *vhtinfo;
1773 int reassoc, resp;
1774 uint8_t rate;
1775
1776 wh = mtod(m0, struct ieee80211_frame *);
1777 frm = (uint8_t *)&wh[1];
1778 efrm = mtod(m0, uint8_t *) + m0->m_len;
1779 switch (subtype) {
1780 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1781 /*
1782 * We process beacon/probe response frames when scanning;
1783 * otherwise we check beacon frames for overlapping non-ERP
1784 * BSS in 11g and/or overlapping legacy BSS when in HT.
1785 */
1786 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
1787 vap->iv_stats.is_rx_mgtdiscard++;
1788 return;
1789 }
1790 /* FALLTHROUGH */
1791 case IEEE80211_FC0_SUBTYPE_BEACON: {
1792 struct ieee80211_scanparams scan;
1793
1794 /* NB: accept off-channel frames */
1795 /* XXX TODO: use rxstatus to determine off-channel details */
1796 if (ieee80211_parse_beacon(ni, m0, ic->ic_curchan, &scan) &~ IEEE80211_BPARSE_OFFCHAN)
1797 return;
1798 /*
1799 * Count frame now that we know it's to be processed.
1800 */
1801 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1802 vap->iv_stats.is_rx_beacon++; /* XXX remove */
1803 IEEE80211_NODE_STAT(ni, rx_beacons);
1804 } else
1805 IEEE80211_NODE_STAT(ni, rx_proberesp);
1806 /*
1807 * If scanning, just pass information to the scan module.
1808 */
1809 if (ic->ic_flags & IEEE80211_F_SCAN) {
1810 if (scan.status == 0 && /* NB: on channel */
1811 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) {
1812 /*
1813 * Actively scanning a channel marked passive;
1814 * send a probe request now that we know there
1815 * is 802.11 traffic present.
1816 *
1817 * XXX check if the beacon we recv'd gives
1818 * us what we need and suppress the probe req
1819 */
1820 ieee80211_probe_curchan(vap, true);
1821 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1822 }
1823 ieee80211_add_scan(vap, ic->ic_curchan, &scan, wh,
1824 subtype, rssi, nf);
1825 return;
1826 }
1827 /*
1828 * Check beacon for overlapping bss w/ non ERP stations.
1829 * If we detect one and protection is configured but not
1830 * enabled, enable it and start a timer that'll bring us
1831 * out if we stop seeing the bss.
1832 */
1833 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1834 scan.status == 0 && /* NB: on-channel */
1835 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/
1836 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) {
1837 vap->iv_lastnonerp = ticks;
1838 vap->iv_flags_ext |= IEEE80211_FEXT_NONERP_PR;
1839 /*
1840 * XXX TODO: this may need to check all VAPs?
1841 */
1842 if (vap->iv_protmode != IEEE80211_PROT_NONE &&
1843 (vap->iv_flags & IEEE80211_F_USEPROT) == 0) {
1844 IEEE80211_NOTE_FRAME(vap,
1845 IEEE80211_MSG_ASSOC, wh,
1846 "non-ERP present on channel %d "
1847 "(saw erp 0x%x from channel %d), "
1848 "enable use of protection",
1849 ic->ic_curchan->ic_ieee,
1850 scan.erp, scan.chan);
1851 vap->iv_flags |= IEEE80211_F_USEPROT;
1852 ieee80211_vap_update_erp_protmode(vap);
1853 }
1854 }
1855 /*
1856 * Check beacon for non-HT station on HT channel
1857 * and update HT BSS occupancy as appropriate.
1858 */
1859 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) {
1860 if (scan.status & IEEE80211_BPARSE_OFFCHAN) {
1861 /*
1862 * Off control channel; only check frames
1863 * that come in the extension channel when
1864 * operating w/ HT40.
1865 */
1866 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan))
1867 break;
1868 if (scan.chan != ic->ic_curchan->ic_extieee)
1869 break;
1870 }
1871 if (scan.htinfo == NULL) {
1872 ieee80211_htprot_update(vap,
1873 IEEE80211_HTINFO_OPMODE_PROTOPT |
1874 IEEE80211_HTINFO_NONHT_PRESENT);
1875 } else if (ishtmixed(scan.htinfo)) {
1876 /* XXX? take NONHT_PRESENT from beacon? */
1877 ieee80211_htprot_update(vap,
1878 IEEE80211_HTINFO_OPMODE_MIXED |
1879 IEEE80211_HTINFO_NONHT_PRESENT);
1880 }
1881 }
1882 break;
1883 }
1884
1885 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1886 if (vap->iv_state != IEEE80211_S_RUN) {
1887 vap->iv_stats.is_rx_mgtdiscard++;
1888 return;
1889 }
1890 /*
1891 * Consult the ACL policy module if setup.
1892 */
1893 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) {
1894 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1895 wh, NULL, "%s", "disallowed by ACL");
1896 vap->iv_stats.is_rx_acl++;
1897 return;
1898 }
1899 /*
1900 * prreq frame format
1901 * [tlv] ssid
1902 * [tlv] supported rates
1903 * [tlv] extended supported rates
1904 */
1905 ssid = rates = xrates = NULL;
1906 while (efrm - frm > 1) {
1907 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1908 switch (*frm) {
1909 case IEEE80211_ELEMID_SSID:
1910 ssid = frm;
1911 break;
1912 case IEEE80211_ELEMID_RATES:
1913 rates = frm;
1914 break;
1915 case IEEE80211_ELEMID_XRATES:
1916 xrates = frm;
1917 break;
1918 }
1919 frm += frm[1] + 2;
1920 }
1921 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1922 if (xrates != NULL)
1923 IEEE80211_VERIFY_ELEMENT(xrates,
1924 IEEE80211_RATE_MAXSIZE - rates[1], return);
1925 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
1926 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
1927 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
1928 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1929 wh, NULL,
1930 "%s", "no ssid with ssid suppression enabled");
1931 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
1932 return;
1933 }
1934
1935 /* XXX find a better class or define it's own */
1936 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
1937 "%s", "recv probe req");
1938 /*
1939 * Some legacy 11b clients cannot hack a complete
1940 * probe response frame. When the request includes
1941 * only a bare-bones rate set, communicate this to
1942 * the transmit side.
1943 */
1944 ieee80211_send_proberesp(vap, wh->i_addr2,
1945 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
1946 break;
1947
1948 case IEEE80211_FC0_SUBTYPE_AUTH: {
1949 uint16_t algo, seq, status;
1950
1951 if (vap->iv_state != IEEE80211_S_RUN) {
1952 vap->iv_stats.is_rx_mgtdiscard++;
1953 return;
1954 }
1955 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1956 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1957 wh, NULL, "%s", "wrong bssid");
1958 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/
1959 return;
1960 }
1961 /*
1962 * auth frame format
1963 * [2] algorithm
1964 * [2] sequence
1965 * [2] status
1966 * [tlv*] challenge
1967 */
1968 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1969 algo = le16toh(*(uint16_t *)frm);
1970 seq = le16toh(*(uint16_t *)(frm + 2));
1971 status = le16toh(*(uint16_t *)(frm + 4));
1972 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1973 "recv auth frame with algorithm %d seq %d", algo, seq);
1974 /*
1975 * Consult the ACL policy module if setup.
1976 */
1977 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) {
1978 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1979 wh, NULL, "%s", "disallowed by ACL");
1980 vap->iv_stats.is_rx_acl++;
1981 ieee80211_send_error(ni, wh->i_addr2,
1982 IEEE80211_FC0_SUBTYPE_AUTH,
1983 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16));
1984 return;
1985 }
1986 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1987 IEEE80211_DISCARD(vap,
1988 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1989 wh, NULL, "%s", "TKIP countermeasures enabled");
1990 vap->iv_stats.is_rx_auth_countermeasures++;
1991 ieee80211_send_error(ni, wh->i_addr2,
1992 IEEE80211_FC0_SUBTYPE_AUTH,
1993 IEEE80211_REASON_MIC_FAILURE);
1994 return;
1995 }
1996 if (algo == IEEE80211_AUTH_ALG_SHARED)
1997 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1998 seq, status);
1999 else if (algo == IEEE80211_AUTH_ALG_OPEN)
2000 hostap_auth_open(ni, wh, rssi, nf, seq, status);
2001 else if (algo == IEEE80211_AUTH_ALG_LEAP) {
2002 authalgreject(ni, wh, algo,
2003 seq+1, IEEE80211_STATUS_ALG);
2004 return;
2005 } else {
2006 /*
2007 * We assume that an unknown algorithm is the result
2008 * of a decryption failure on a shared key auth frame;
2009 * return a status code appropriate for that instead
2010 * of IEEE80211_STATUS_ALG.
2011 *
2012 * NB: a seq# of 4 is intentional; the decrypted
2013 * frame likely has a bogus seq value.
2014 */
2015 authalgreject(ni, wh, algo,
2016 4, IEEE80211_STATUS_CHALLENGE);
2017 return;
2018 }
2019 break;
2020 }
2021
2022 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
2023 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
2024 uint16_t capinfo, lintval;
2025 struct ieee80211_rsnparms rsnparms;
2026
2027 if (vap->iv_state != IEEE80211_S_RUN) {
2028 vap->iv_stats.is_rx_mgtdiscard++;
2029 return;
2030 }
2031 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
2032 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2033 wh, NULL, "%s", "wrong bssid");
2034 vap->iv_stats.is_rx_assoc_bss++;
2035 return;
2036 }
2037 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
2038 reassoc = 1;
2039 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
2040 } else {
2041 reassoc = 0;
2042 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
2043 }
2044 if (ni == vap->iv_bss) {
2045 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
2046 "deny %s request, sta not authenticated",
2047 reassoc ? "reassoc" : "assoc");
2048 ieee80211_send_error(ni, wh->i_addr2,
2049 IEEE80211_FC0_SUBTYPE_DEAUTH,
2050 IEEE80211_REASON_ASSOC_NOT_AUTHED);
2051 vap->iv_stats.is_rx_assoc_notauth++;
2052 return;
2053 }
2054
2055 /*
2056 * asreq frame format
2057 * [2] capability information
2058 * [2] listen interval
2059 * [6*] current AP address (reassoc only)
2060 * [tlv] ssid
2061 * [tlv] supported rates
2062 * [tlv] extended supported rates
2063 * [tlv] WPA or RSN
2064 * [tlv] HT capabilities
2065 * [tlv] Atheros capabilities
2066 */
2067 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return);
2068 capinfo = le16toh(*(uint16_t *)frm); frm += 2;
2069 lintval = le16toh(*(uint16_t *)frm); frm += 2;
2070 if (reassoc)
2071 frm += 6; /* ignore current AP info */
2072 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL;
2073 vhtcap = vhtinfo = NULL;
2074 sfrm = frm;
2075 while (efrm - frm > 1) {
2076 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
2077 switch (*frm) {
2078 case IEEE80211_ELEMID_SSID:
2079 ssid = frm;
2080 break;
2081 case IEEE80211_ELEMID_RATES:
2082 rates = frm;
2083 break;
2084 case IEEE80211_ELEMID_XRATES:
2085 xrates = frm;
2086 break;
2087 case IEEE80211_ELEMID_RSN:
2088 rsn = frm;
2089 break;
2090 case IEEE80211_ELEMID_HTCAP:
2091 htcap = frm;
2092 break;
2093 case IEEE80211_ELEMID_VHT_CAP:
2094 vhtcap = frm;
2095 break;
2096 case IEEE80211_ELEMID_VHT_OPMODE:
2097 vhtinfo = frm;
2098 break;
2099 case IEEE80211_ELEMID_VENDOR:
2100 if (iswpaoui(frm))
2101 wpa = frm;
2102 else if (iswmeinfo(frm))
2103 wme = frm;
2104 #ifdef IEEE80211_SUPPORT_SUPERG
2105 else if (isatherosoui(frm))
2106 ath = frm;
2107 #endif
2108 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
2109 if (ishtcapoui(frm) && htcap == NULL)
2110 htcap = frm;
2111 }
2112 break;
2113 }
2114 frm += frm[1] + 2;
2115 }
2116 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
2117 if (xrates != NULL)
2118 IEEE80211_VERIFY_ELEMENT(xrates,
2119 IEEE80211_RATE_MAXSIZE - rates[1], return);
2120 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
2121 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
2122 if (htcap != NULL) {
2123 IEEE80211_VERIFY_LENGTH(htcap[1],
2124 htcap[0] == IEEE80211_ELEMID_VENDOR ?
2125 4 + sizeof(struct ieee80211_ie_htcap)-2 :
2126 sizeof(struct ieee80211_ie_htcap)-2,
2127 return); /* XXX just NULL out? */
2128 }
2129
2130 /* Validate VHT IEs */
2131 if (vhtcap != NULL) {
2132 IEEE80211_VERIFY_LENGTH(vhtcap[1],
2133 sizeof(struct ieee80211_vht_cap),
2134 return);
2135 }
2136 if (vhtinfo != NULL) {
2137 IEEE80211_VERIFY_LENGTH(vhtinfo[1],
2138 sizeof(struct ieee80211_vht_operation),
2139 return);
2140 }
2141
2142 if ((vap->iv_flags & IEEE80211_F_WPA) &&
2143 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo))
2144 return;
2145 /* discard challenge after association */
2146 if (ni->ni_challenge != NULL) {
2147 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
2148 ni->ni_challenge = NULL;
2149 }
2150 /* NB: 802.11 spec says to ignore station's privacy bit */
2151 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
2152 capinfomismatch(ni, wh, reassoc, resp,
2153 "capability", capinfo);
2154 return;
2155 }
2156 /*
2157 * Disallow re-associate w/ invalid slot time setting.
2158 */
2159 if (ni->ni_associd != 0 &&
2160 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2161 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
2162 capinfomismatch(ni, wh, reassoc, resp,
2163 "slot time", capinfo);
2164 return;
2165 }
2166 rate = ieee80211_setup_rates(ni, rates, xrates,
2167 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
2168 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
2169 if (rate & IEEE80211_RATE_BASIC) {
2170 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate);
2171 vap->iv_stats.is_rx_assoc_norate++;
2172 return;
2173 }
2174 /*
2175 * If constrained to 11g-only stations reject an
2176 * 11b-only station. We cheat a bit here by looking
2177 * at the max negotiated xmit rate and assuming anyone
2178 * with a best rate <24Mb/s is an 11b station.
2179 */
2180 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) {
2181 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate);
2182 vap->iv_stats.is_rx_assoc_norate++;
2183 return;
2184 }
2185
2186 /*
2187 * Do HT rate set handling and setup HT node state.
2188 */
2189 ni->ni_chan = vap->iv_bss->ni_chan;
2190
2191 /* VHT */
2192 if (IEEE80211_IS_CHAN_VHT(ni->ni_chan) &&
2193 vhtcap != NULL &&
2194 vhtinfo != NULL) {
2195 /* XXX TODO; see below */
2196 printf("%s: VHT TODO!\n", __func__);
2197 ieee80211_vht_node_init(ni);
2198 ieee80211_vht_update_cap(ni, vhtcap, vhtinfo);
2199 } else if (ni->ni_flags & IEEE80211_NODE_VHT)
2200 ieee80211_vht_node_cleanup(ni);
2201
2202 /* HT */
2203 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2204 rate = ieee80211_setup_htrates(ni, htcap,
2205 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO |
2206 IEEE80211_F_DOBRS);
2207 if (rate & IEEE80211_RATE_BASIC) {
2208 ratesetmismatch(ni, wh, reassoc, resp,
2209 "HT", rate);
2210 vap->iv_stats.is_ht_assoc_norate++;
2211 return;
2212 }
2213 ieee80211_ht_node_init(ni);
2214 ieee80211_ht_updatehtcap(ni, htcap);
2215 } else if (ni->ni_flags & IEEE80211_NODE_HT)
2216 ieee80211_ht_node_cleanup(ni);
2217
2218 /* Finally - this will use HT/VHT info to change node channel */
2219 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2220 ieee80211_ht_updatehtcap_final(ni);
2221 }
2222
2223 #ifdef IEEE80211_SUPPORT_SUPERG
2224 /* Always do ff node cleanup; for A-MSDU */
2225 ieee80211_ff_node_cleanup(ni);
2226 #endif
2227 /*
2228 * Allow AMPDU operation only with unencrypted traffic
2229 * or AES-CCM; the 11n spec only specifies these ciphers
2230 * so permitting any others is undefined and can lead
2231 * to interoperability problems.
2232 */
2233 if ((ni->ni_flags & IEEE80211_NODE_HT) &&
2234 (((vap->iv_flags & IEEE80211_F_WPA) &&
2235 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) ||
2236 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) {
2237 IEEE80211_NOTE(vap,
2238 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
2239 "disallow HT use because WEP or TKIP requested, "
2240 "capinfo 0x%x ucastcipher %d", capinfo,
2241 rsnparms.rsn_ucastcipher);
2242 ieee80211_ht_node_cleanup(ni);
2243 #ifdef IEEE80211_SUPPORT_SUPERG
2244 /* Always do ff node cleanup; for A-MSDU */
2245 ieee80211_ff_node_cleanup(ni);
2246 #endif
2247 vap->iv_stats.is_ht_assoc_downgrade++;
2248 }
2249 /*
2250 * If constrained to 11n-only stations reject legacy stations.
2251 */
2252 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) &&
2253 (ni->ni_flags & IEEE80211_NODE_HT) == 0) {
2254 htcapmismatch(ni, wh, reassoc, resp);
2255 vap->iv_stats.is_ht_assoc_nohtcap++;
2256 return;
2257 }
2258 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
2259 ni->ni_noise = nf;
2260 ni->ni_intval = lintval;
2261 ni->ni_capinfo = capinfo;
2262 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell;
2263 ni->ni_fhindex = vap->iv_bss->ni_fhindex;
2264 /*
2265 * Store the IEs.
2266 * XXX maybe better to just expand
2267 */
2268 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) {
2269 #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off)
2270 if (wpa != NULL)
2271 setie(wpa_ie, wpa - sfrm);
2272 if (rsn != NULL)
2273 setie(rsn_ie, rsn - sfrm);
2274 if (htcap != NULL)
2275 setie(htcap_ie, htcap - sfrm);
2276 if (wme != NULL) {
2277 setie(wme_ie, wme - sfrm);
2278 /*
2279 * Mark node as capable of QoS.
2280 */
2281 ni->ni_flags |= IEEE80211_NODE_QOS;
2282 if (ieee80211_parse_wmeie(wme, wh, ni) > 0) {
2283 if (ni->ni_uapsd != 0)
2284 ni->ni_flags |=
2285 IEEE80211_NODE_UAPSD;
2286 else
2287 ni->ni_flags &=
2288 ~IEEE80211_NODE_UAPSD;
2289 }
2290 } else
2291 ni->ni_flags &=
2292 ~(IEEE80211_NODE_QOS |
2293 IEEE80211_NODE_UAPSD);
2294 #ifdef IEEE80211_SUPPORT_SUPERG
2295 if (ath != NULL) {
2296 setie(ath_ie, ath - sfrm);
2297 /*
2298 * Parse ATH station parameters.
2299 */
2300 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
2301 } else
2302 #endif
2303 ni->ni_ath_flags = 0;
2304 #undef setie
2305 } else {
2306 ni->ni_flags &= ~IEEE80211_NODE_QOS;
2307 ni->ni_flags &= ~IEEE80211_NODE_UAPSD;
2308 ni->ni_ath_flags = 0;
2309 }
2310 ieee80211_node_join(ni, resp);
2311 ieee80211_deliver_l2uf(ni);
2312 break;
2313 }
2314
2315 case IEEE80211_FC0_SUBTYPE_DEAUTH:
2316 case IEEE80211_FC0_SUBTYPE_DISASSOC: {
2317 #ifdef IEEE80211_DEBUG
2318 uint16_t reason;
2319 #endif
2320
2321 if (vap->iv_state != IEEE80211_S_RUN ||
2322 /* NB: can happen when in promiscuous mode */
2323 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
2324 vap->iv_stats.is_rx_mgtdiscard++;
2325 break;
2326 }
2327 /*
2328 * deauth/disassoc frame format
2329 * [2] reason
2330 */
2331 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
2332 #ifdef IEEE80211_DEBUG
2333 reason = le16toh(*(uint16_t *)frm);
2334 #endif
2335 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) {
2336 vap->iv_stats.is_rx_deauth++;
2337 IEEE80211_NODE_STAT(ni, rx_deauth);
2338 } else {
2339 vap->iv_stats.is_rx_disassoc++;
2340 IEEE80211_NODE_STAT(ni, rx_disassoc);
2341 }
2342 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2343 "recv %s (reason: %d (%s))",
2344 ieee80211_mgt_subtype_name(subtype),
2345 reason, ieee80211_reason_to_string(reason));
2346 if (ni != vap->iv_bss)
2347 ieee80211_node_leave(ni);
2348 break;
2349 }
2350
2351 case IEEE80211_FC0_SUBTYPE_ACTION:
2352 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
2353 if (ni == vap->iv_bss) {
2354 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2355 wh, NULL, "%s", "unknown node");
2356 vap->iv_stats.is_rx_mgtdiscard++;
2357 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
2358 !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
2359 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2360 wh, NULL, "%s", "not for us");
2361 vap->iv_stats.is_rx_mgtdiscard++;
2362 } else if (vap->iv_state != IEEE80211_S_RUN) {
2363 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2364 wh, NULL, "wrong state %s",
2365 ieee80211_state_name[vap->iv_state]);
2366 vap->iv_stats.is_rx_mgtdiscard++;
2367 } else {
2368 if (ieee80211_parse_action(ni, m0) == 0)
2369 (void)ic->ic_recv_action(ni, wh, frm, efrm);
2370 }
2371 break;
2372
2373 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2374 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2375 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
2376 case IEEE80211_FC0_SUBTYPE_ATIM:
2377 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2378 wh, NULL, "%s", "not handled");
2379 vap->iv_stats.is_rx_mgtdiscard++;
2380 break;
2381
2382 default:
2383 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2384 wh, "mgt", "subtype 0x%x not handled", subtype);
2385 vap->iv_stats.is_rx_badsubtype++;
2386 break;
2387 }
2388 }
2389
2390 static void
hostap_recv_ctl(struct ieee80211_node * ni,struct mbuf * m,int subtype)2391 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
2392 {
2393 switch (subtype) {
2394 case IEEE80211_FC0_SUBTYPE_PS_POLL:
2395 ni->ni_vap->iv_recv_pspoll(ni, m);
2396 break;
2397 case IEEE80211_FC0_SUBTYPE_BAR:
2398 ieee80211_recv_bar(ni, m);
2399 break;
2400 }
2401 }
2402
2403 /*
2404 * Process a received ps-poll frame.
2405 */
2406 void
ieee80211_recv_pspoll(struct ieee80211_node * ni,struct mbuf * m0)2407 ieee80211_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
2408 {
2409 struct ieee80211vap *vap = ni->ni_vap;
2410 struct ieee80211com *ic = vap->iv_ic;
2411 struct ieee80211_frame_min *wh;
2412 struct mbuf *m;
2413 uint16_t aid;
2414 int qlen;
2415
2416 wh = mtod(m0, struct ieee80211_frame_min *);
2417 if (ni->ni_associd == 0) {
2418 IEEE80211_DISCARD(vap,
2419 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2420 (struct ieee80211_frame *) wh, NULL,
2421 "%s", "unassociated station");
2422 vap->iv_stats.is_ps_unassoc++;
2423 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
2424 IEEE80211_REASON_NOT_ASSOCED);
2425 return;
2426 }
2427
2428 aid = le16toh(*(uint16_t *)wh->i_dur);
2429 if (aid != ni->ni_associd) {
2430 IEEE80211_DISCARD(vap,
2431 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2432 (struct ieee80211_frame *) wh, NULL,
2433 "aid mismatch: sta aid 0x%x poll aid 0x%x",
2434 ni->ni_associd, aid);
2435 vap->iv_stats.is_ps_badaid++;
2436 /*
2437 * NB: We used to deauth the station but it turns out
2438 * the Blackberry Curve 8230 (and perhaps other devices)
2439 * sometimes send the wrong AID when WME is negotiated.
2440 * Being more lenient here seems ok as we already check
2441 * the station is associated and we only return frames
2442 * queued for the station (i.e. we don't use the AID).
2443 */
2444 return;
2445 }
2446
2447 /* Okay, take the first queued packet and put it out... */
2448 m = ieee80211_node_psq_dequeue(ni, &qlen);
2449 if (m == NULL) {
2450 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2,
2451 "%s", "recv ps-poll, but queue empty");
2452 ieee80211_send_nulldata(ieee80211_ref_node(ni));
2453 vap->iv_stats.is_ps_qempty++; /* XXX node stat */
2454 if (vap->iv_set_tim != NULL)
2455 vap->iv_set_tim(ni, 0); /* just in case */
2456 return;
2457 }
2458 /*
2459 * If there are more packets, set the more packets bit
2460 * in the packet dispatched to the station; otherwise
2461 * turn off the TIM bit.
2462 */
2463 if (qlen != 0) {
2464 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2465 "recv ps-poll, send packet, %u still queued", qlen);
2466 m->m_flags |= M_MORE_DATA;
2467 } else {
2468 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2469 "%s", "recv ps-poll, send packet, queue empty");
2470 if (vap->iv_set_tim != NULL)
2471 vap->iv_set_tim(ni, 0);
2472 }
2473 m->m_flags |= M_PWR_SAV; /* bypass PS handling */
2474
2475 /*
2476 * Do the right thing; if it's an encap'ed frame then
2477 * call ieee80211_parent_xmitpkt() else
2478 * call ieee80211_vap_xmitpkt().
2479 */
2480 if (m->m_flags & M_ENCAP) {
2481 (void) ieee80211_parent_xmitpkt(ic, m);
2482 } else {
2483 (void) ieee80211_vap_xmitpkt(vap, m);
2484 }
2485 }
2486