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 #include <sys/cdefs.h>
29 #ifdef __FreeBSD__
30 #endif
31
32 /*
33 * IEEE 802.11 HOSTAP mode support.
34 */
35 #include "opt_inet.h"
36 #include "opt_wlan.h"
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/mbuf.h>
41 #include <sys/malloc.h>
42 #include <sys/kernel.h>
43
44 #include <sys/socket.h>
45 #include <sys/sockio.h>
46 #include <sys/endian.h>
47 #include <sys/errno.h>
48 #include <sys/proc.h>
49 #include <sys/sysctl.h>
50
51 #include <net/if.h>
52 #include <net/if_var.h>
53 #include <net/if_media.h>
54 #include <net/if_llc.h>
55 #include <net/if_private.h>
56 #include <net/ethernet.h>
57
58 #include <net/bpf.h>
59
60 #include <net80211/ieee80211_var.h>
61 #include <net80211/ieee80211_hostap.h>
62 #include <net80211/ieee80211_input.h>
63 #ifdef IEEE80211_SUPPORT_SUPERG
64 #include <net80211/ieee80211_superg.h>
65 #endif
66 #include <net80211/ieee80211_wds.h>
67 #include <net80211/ieee80211_vht.h>
68 #include <net80211/ieee80211_sta.h> /* for parse_wmeie */
69
70 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2)
71
72 static void hostap_vattach(struct ieee80211vap *);
73 static int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int);
74 static int hostap_input(struct ieee80211_node *ni, struct mbuf *m,
75 const struct ieee80211_rx_stats *,
76 int rssi, int nf);
77 static void hostap_deliver_data(struct ieee80211vap *,
78 struct ieee80211_node *, struct mbuf *);
79 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *,
80 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf);
81 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int);
82
83 void
ieee80211_hostap_attach(struct ieee80211com * ic)84 ieee80211_hostap_attach(struct ieee80211com *ic)
85 {
86 ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach;
87 }
88
89 void
ieee80211_hostap_detach(struct ieee80211com * ic)90 ieee80211_hostap_detach(struct ieee80211com *ic)
91 {
92 }
93
94 static void
hostap_vdetach(struct ieee80211vap * vap)95 hostap_vdetach(struct ieee80211vap *vap)
96 {
97 }
98
99 static void
hostap_vattach(struct ieee80211vap * vap)100 hostap_vattach(struct ieee80211vap *vap)
101 {
102 vap->iv_newstate = hostap_newstate;
103 vap->iv_input = hostap_input;
104 vap->iv_recv_mgmt = hostap_recv_mgmt;
105 vap->iv_recv_ctl = hostap_recv_ctl;
106 vap->iv_opdetach = hostap_vdetach;
107 vap->iv_deliver_data = hostap_deliver_data;
108 vap->iv_recv_pspoll = ieee80211_recv_pspoll;
109 }
110
111 static void
sta_disassoc(void * arg,struct ieee80211_node * ni)112 sta_disassoc(void *arg, struct ieee80211_node *ni)
113 {
114
115 if (ni->ni_associd != 0) {
116 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC,
117 IEEE80211_REASON_ASSOC_LEAVE);
118 ieee80211_node_leave(ni);
119 }
120 }
121
122 static void
sta_csa(void * arg,struct ieee80211_node * ni)123 sta_csa(void *arg, struct ieee80211_node *ni)
124 {
125 struct ieee80211vap *vap = ni->ni_vap;
126
127 if (ni->ni_associd != 0)
128 if (ni->ni_inact > vap->iv_inact_init) {
129 ni->ni_inact = vap->iv_inact_init;
130 IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
131 "%s: inact %u", __func__, ni->ni_inact);
132 }
133 }
134
135 static void
sta_drop(void * arg,struct ieee80211_node * ni)136 sta_drop(void *arg, struct ieee80211_node *ni)
137 {
138
139 if (ni->ni_associd != 0)
140 ieee80211_node_leave(ni);
141 }
142
143 /*
144 * Does a channel change require associated stations to re-associate
145 * so protocol state is correct. This is used when doing CSA across
146 * bands or similar (e.g. HT -> legacy).
147 */
148 static int
isbandchange(struct ieee80211com * ic)149 isbandchange(struct ieee80211com *ic)
150 {
151 return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) &
152 (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF |
153 IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0;
154 }
155
156 /*
157 * IEEE80211_M_HOSTAP vap state machine handler.
158 */
159 static int
hostap_newstate(struct ieee80211vap * vap,enum ieee80211_state nstate,int arg)160 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
161 {
162 struct ieee80211com *ic = vap->iv_ic;
163 enum ieee80211_state ostate;
164
165 IEEE80211_LOCK_ASSERT(ic);
166
167 ostate = vap->iv_state;
168 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
169 __func__, ieee80211_state_name[ostate],
170 ieee80211_state_name[nstate], arg);
171 vap->iv_state = nstate; /* state transition */
172 if (ostate != IEEE80211_S_SCAN)
173 ieee80211_cancel_scan(vap); /* background scan */
174 switch (nstate) {
175 case IEEE80211_S_INIT:
176 switch (ostate) {
177 case IEEE80211_S_SCAN:
178 ieee80211_cancel_scan(vap);
179 break;
180 case IEEE80211_S_CAC:
181 ieee80211_dfs_cac_stop(vap);
182 break;
183 case IEEE80211_S_RUN:
184 ieee80211_iterate_nodes_vap(&ic->ic_sta, vap,
185 sta_disassoc, NULL);
186 break;
187 default:
188 break;
189 }
190 if (ostate != IEEE80211_S_INIT) {
191 /* NB: optimize INIT -> INIT case */
192 ieee80211_reset_bss(vap);
193 }
194 if (vap->iv_auth->ia_detach != NULL)
195 vap->iv_auth->ia_detach(vap);
196 break;
197 case IEEE80211_S_SCAN:
198 switch (ostate) {
199 case IEEE80211_S_CSA:
200 case IEEE80211_S_RUN:
201 ieee80211_iterate_nodes_vap(&ic->ic_sta, vap,
202 sta_disassoc, NULL);
203 /*
204 * Clear overlapping BSS state; the beacon frame
205 * will be reconstructed on transition to the RUN
206 * state and the timeout routines check if the flag
207 * is set before doing anything so this is sufficient.
208 */
209 vap->iv_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
210 vap->iv_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
211 /* XXX TODO: schedule deferred update? */
212 /* fall thru... */
213 case IEEE80211_S_CAC:
214 /*
215 * NB: We may get here because of a manual channel
216 * change in which case we need to stop CAC
217 * XXX no need to stop if ostate RUN but it's ok
218 */
219 ieee80211_dfs_cac_stop(vap);
220 /* fall thru... */
221 case IEEE80211_S_INIT:
222 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
223 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
224 /*
225 * Already have a channel; bypass the
226 * scan and startup immediately.
227 * ieee80211_create_ibss will call back to
228 * move us to RUN state.
229 */
230 ieee80211_create_ibss(vap, vap->iv_des_chan);
231 break;
232 }
233 /*
234 * Initiate a scan. We can come here as a result
235 * of an IEEE80211_IOC_SCAN_REQ too in which case
236 * the vap will be marked with IEEE80211_FEXT_SCANREQ
237 * and the scan request parameters will be present
238 * in iv_scanreq. Otherwise we do the default.
239 */
240 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
241 ieee80211_check_scan(vap,
242 vap->iv_scanreq_flags,
243 vap->iv_scanreq_duration,
244 vap->iv_scanreq_mindwell,
245 vap->iv_scanreq_maxdwell,
246 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
247 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
248 } else
249 ieee80211_check_scan_current(vap);
250 break;
251 case IEEE80211_S_SCAN:
252 /*
253 * A state change requires a reset; scan.
254 */
255 ieee80211_check_scan_current(vap);
256 break;
257 default:
258 break;
259 }
260 break;
261 case IEEE80211_S_CAC:
262 /*
263 * Start CAC on a DFS channel. We come here when starting
264 * a bss on a DFS channel (see ieee80211_create_ibss).
265 */
266 ieee80211_dfs_cac_start(vap);
267 break;
268 case IEEE80211_S_RUN:
269 if (vap->iv_flags & IEEE80211_F_WPA) {
270 /* XXX validate prerequisites */
271 }
272 switch (ostate) {
273 case IEEE80211_S_INIT:
274 /*
275 * Already have a channel; bypass the
276 * scan and startup immediately.
277 * Note that ieee80211_create_ibss will call
278 * back to do a RUN->RUN state change.
279 */
280 ieee80211_create_ibss(vap,
281 ieee80211_ht_adjust_channel(ic,
282 ic->ic_curchan, vap->iv_flags_ht));
283 /* NB: iv_bss is changed on return */
284 break;
285 case IEEE80211_S_CAC:
286 /*
287 * NB: This is the normal state change when CAC
288 * expires and no radar was detected; no need to
289 * clear the CAC timer as it's already expired.
290 */
291 /* fall thru... */
292 case IEEE80211_S_CSA:
293 /*
294 * Shorten inactivity timer of associated stations
295 * to weed out sta's that don't follow a CSA.
296 */
297 ieee80211_iterate_nodes_vap(&ic->ic_sta, vap,
298 sta_csa, NULL);
299 /*
300 * Update bss node channel to reflect where
301 * we landed after CSA.
302 */
303 ieee80211_node_set_chan(vap->iv_bss,
304 ieee80211_ht_adjust_channel(ic, ic->ic_curchan,
305 ieee80211_htchanflags(vap->iv_bss->ni_chan)));
306 /* XXX bypass debug msgs */
307 break;
308 case IEEE80211_S_SCAN:
309 case IEEE80211_S_RUN:
310 #ifdef IEEE80211_DEBUG
311 if (ieee80211_msg_debug(vap)) {
312 struct ieee80211_node *ni = vap->iv_bss;
313 ieee80211_note(vap,
314 "synchronized with %s ssid ",
315 ether_sprintf(ni->ni_bssid));
316 ieee80211_print_essid(ni->ni_essid,
317 ni->ni_esslen);
318 /* XXX MCS/HT */
319 printf(" channel %d start %uMb\n",
320 ieee80211_chan2ieee(ic, ic->ic_curchan),
321 IEEE80211_RATE2MBS(ni->ni_txrate));
322 }
323 #endif
324 break;
325 default:
326 break;
327 }
328 /*
329 * Start/stop the authenticator. We delay until here
330 * to allow configuration to happen out of order.
331 */
332 if (vap->iv_auth->ia_attach != NULL) {
333 /* XXX check failure */
334 vap->iv_auth->ia_attach(vap);
335 } else if (vap->iv_auth->ia_detach != NULL) {
336 vap->iv_auth->ia_detach(vap);
337 }
338 ieee80211_node_authorize(vap->iv_bss);
339 break;
340 case IEEE80211_S_CSA:
341 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) {
342 /*
343 * On a ``band change'' silently drop associated
344 * stations as they must re-associate before they
345 * can pass traffic (as otherwise protocol state
346 * such as capabilities and the negotiated rate
347 * set may/will be wrong).
348 */
349 ieee80211_iterate_nodes_vap(&ic->ic_sta, vap,
350 sta_drop, NULL);
351 }
352 break;
353 default:
354 break;
355 }
356 return 0;
357 }
358
359 static void
hostap_deliver_data(struct ieee80211vap * vap,struct ieee80211_node * ni,struct mbuf * m)360 hostap_deliver_data(struct ieee80211vap *vap,
361 struct ieee80211_node *ni, struct mbuf *m)
362 {
363 struct ether_header *eh = mtod(m, struct ether_header *);
364 struct ifnet *ifp = vap->iv_ifp;
365
366 /* clear driver/net80211 flags before passing up */
367 m->m_flags &= ~(M_MCAST | M_BCAST);
368 m_clrprotoflags(m);
369
370 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP,
371 ("gack, opmode %d", vap->iv_opmode));
372 /*
373 * Do accounting.
374 */
375 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
376 IEEE80211_NODE_STAT(ni, rx_data);
377 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
378 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
379 m->m_flags |= M_MCAST; /* XXX M_BCAST? */
380 IEEE80211_NODE_STAT(ni, rx_mcast);
381 } else
382 IEEE80211_NODE_STAT(ni, rx_ucast);
383
384 /* perform as a bridge within the AP */
385 if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) {
386 struct mbuf *mcopy = NULL;
387
388 if (m->m_flags & M_MCAST) {
389 mcopy = m_dup(m, IEEE80211_M_NOWAIT);
390 if (mcopy == NULL)
391 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
392 else
393 mcopy->m_flags |= M_MCAST;
394 } else {
395 /*
396 * Check if the destination is associated with the
397 * same vap and authorized to receive traffic.
398 * Beware of traffic destined for the vap itself;
399 * sending it will not work; just let it be delivered
400 * normally.
401 */
402 struct ieee80211_node *sta = ieee80211_find_vap_node(
403 &vap->iv_ic->ic_sta, vap, eh->ether_dhost);
404 if (sta != NULL) {
405 if (ieee80211_node_is_authorized(sta)) {
406 /*
407 * Beware of sending to ourself; this
408 * needs to happen via the normal
409 * input path.
410 */
411 if (sta != vap->iv_bss) {
412 mcopy = m;
413 m = NULL;
414 }
415 } else {
416 vap->iv_stats.is_rx_unauth++;
417 IEEE80211_NODE_STAT(sta, rx_unauth);
418 }
419 ieee80211_free_node(sta);
420 }
421 }
422 if (mcopy != NULL)
423 (void) ieee80211_vap_xmitpkt(vap, mcopy);
424 }
425 if (m != NULL) {
426 struct epoch_tracker et;
427
428 /*
429 * Mark frame as coming from vap's interface.
430 */
431 m->m_pkthdr.rcvif = ifp;
432 if (m->m_flags & M_MCAST) {
433 /*
434 * Spam DWDS vap's w/ multicast traffic.
435 */
436 /* XXX only if dwds in use? */
437 ieee80211_dwds_mcast(vap, m);
438 }
439 if (ni->ni_vlan != 0) {
440 /* attach vlan tag */
441 m->m_pkthdr.ether_vtag = ni->ni_vlan;
442 m->m_flags |= M_VLANTAG;
443 }
444 NET_EPOCH_ENTER(et);
445 ifp->if_input(ifp, m);
446 NET_EPOCH_EXIT(et);
447 }
448 }
449
450 /*
451 * Decide if a received management frame should be
452 * printed when debugging is enabled. This filters some
453 * of the less interesting frames that come frequently
454 * (e.g. beacons).
455 */
456 static __inline int
doprint(struct ieee80211vap * vap,int subtype)457 doprint(struct ieee80211vap *vap, int subtype)
458 {
459 switch (subtype) {
460 case IEEE80211_FC0_SUBTYPE_BEACON:
461 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
462 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
463 return 0;
464 }
465 return 1;
466 }
467
468 /*
469 * Process a received frame. The node associated with the sender
470 * should be supplied. If nothing was found in the node table then
471 * the caller is assumed to supply a reference to iv_bss instead.
472 * The RSSI and a timestamp are also supplied. The RSSI data is used
473 * during AP scanning to select a AP to associate with; it can have
474 * any units so long as values have consistent units and higher values
475 * mean ``better signal''. The receive timestamp is currently not used
476 * by the 802.11 layer.
477 */
478 static int
hostap_input(struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_rx_stats * rxs,int rssi,int nf)479 hostap_input(struct ieee80211_node *ni, struct mbuf *m,
480 const struct ieee80211_rx_stats *rxs, int rssi, int nf)
481 {
482 struct ieee80211vap *vap = ni->ni_vap;
483 struct ieee80211com *ic = ni->ni_ic;
484 struct ifnet *ifp = vap->iv_ifp;
485 struct ieee80211_frame *wh;
486 struct ieee80211_key *key;
487 struct ether_header *eh;
488 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
489 uint8_t dir, type, subtype, qos;
490 uint8_t *bssid;
491 int is_hw_decrypted = 0;
492 int has_decrypted = 0;
493
494 /*
495 * Some devices do hardware decryption all the way through
496 * to pretending the frame wasn't encrypted in the first place.
497 * So, tag it appropriately so it isn't discarded inappropriately.
498 */
499 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED))
500 is_hw_decrypted = 1;
501
502 if (m->m_flags & M_AMPDU_MPDU) {
503 /*
504 * Fastpath for A-MPDU reorder q resubmission. Frames
505 * w/ M_AMPDU_MPDU marked have already passed through
506 * here but were received out of order and been held on
507 * the reorder queue. When resubmitted they are marked
508 * with the M_AMPDU_MPDU flag and we can bypass most of
509 * the normal processing.
510 */
511 wh = mtod(m, struct ieee80211_frame *);
512 type = IEEE80211_FC0_TYPE_DATA;
513 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
514 subtype = IEEE80211_FC0_SUBTYPE_QOS_DATA;
515 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
516 goto resubmit_ampdu;
517 }
518
519 KASSERT(ni != NULL, ("null node"));
520 ni->ni_inact = ni->ni_inact_reload;
521
522 type = -1; /* undefined */
523
524 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
525 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
526 ni->ni_macaddr, NULL,
527 "too short (1): len %u", m->m_pkthdr.len);
528 vap->iv_stats.is_rx_tooshort++;
529 goto out;
530 }
531 /*
532 * Bit of a cheat here, we use a pointer for a 3-address
533 * frame format but don't reference fields past outside
534 * ieee80211_frame_min w/o first validating the data is
535 * present.
536 */
537 wh = mtod(m, struct ieee80211_frame *);
538
539 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
540 IEEE80211_FC0_VERSION_0) {
541 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
542 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
543 wh->i_fc[0], wh->i_fc[1]);
544 vap->iv_stats.is_rx_badversion++;
545 goto err;
546 }
547
548 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
549 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
550 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
551 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
552 if (dir != IEEE80211_FC1_DIR_NODS)
553 bssid = wh->i_addr1;
554 else if (type == IEEE80211_FC0_TYPE_CTL)
555 bssid = wh->i_addr1;
556 else {
557 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
558 IEEE80211_DISCARD_MAC(vap,
559 IEEE80211_MSG_ANY, ni->ni_macaddr,
560 NULL, "too short (2): len %u",
561 m->m_pkthdr.len);
562 vap->iv_stats.is_rx_tooshort++;
563 goto out;
564 }
565 bssid = wh->i_addr3;
566 }
567 /*
568 * Validate the bssid.
569 */
570 if (!(type == IEEE80211_FC0_TYPE_MGT &&
571 subtype == IEEE80211_FC0_SUBTYPE_BEACON) &&
572 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
573 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
574 /* not interested in */
575 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
576 bssid, NULL, "%s", "not to bss");
577 vap->iv_stats.is_rx_wrongbss++;
578 goto out;
579 }
580
581 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
582 ni->ni_noise = nf;
583 if (IEEE80211_HAS_SEQ(type, subtype)) {
584 uint8_t tid = ieee80211_gettid(wh);
585 if (IEEE80211_QOS_HAS_SEQ(wh) &&
586 TID_TO_WME_AC(tid) >= WME_AC_VI)
587 ic->ic_wme.wme_hipri_traffic++;
588 if (! ieee80211_check_rxseq(ni, wh, bssid, rxs))
589 goto out;
590 }
591 }
592
593 switch (type) {
594 case IEEE80211_FC0_TYPE_DATA:
595 hdrspace = ieee80211_hdrspace(ic, wh);
596 if (m->m_len < hdrspace &&
597 (m = m_pullup(m, hdrspace)) == NULL) {
598 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
599 ni->ni_macaddr, NULL,
600 "data too short: expecting %u", hdrspace);
601 vap->iv_stats.is_rx_tooshort++;
602 goto out; /* XXX */
603 }
604 if (!(dir == IEEE80211_FC1_DIR_TODS ||
605 (dir == IEEE80211_FC1_DIR_DSTODS &&
606 (vap->iv_flags & IEEE80211_F_DWDS)))) {
607 if (dir != IEEE80211_FC1_DIR_DSTODS) {
608 IEEE80211_DISCARD(vap,
609 IEEE80211_MSG_INPUT, wh, "data",
610 "incorrect dir 0x%x", dir);
611 } else {
612 IEEE80211_DISCARD(vap,
613 IEEE80211_MSG_INPUT |
614 IEEE80211_MSG_WDS, wh,
615 "4-address data",
616 "%s", "DWDS not enabled");
617 }
618 vap->iv_stats.is_rx_wrongdir++;
619 goto out;
620 }
621 /* check if source STA is associated */
622 if (ni == vap->iv_bss) {
623 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
624 wh, "data", "%s", "unknown src");
625 ieee80211_send_error(ni, wh->i_addr2,
626 IEEE80211_FC0_SUBTYPE_DEAUTH,
627 IEEE80211_REASON_NOT_AUTHED);
628 vap->iv_stats.is_rx_notassoc++;
629 goto err;
630 }
631 if (ni->ni_associd == 0) {
632 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
633 wh, "data", "%s", "unassoc src");
634 IEEE80211_SEND_MGMT(ni,
635 IEEE80211_FC0_SUBTYPE_DISASSOC,
636 IEEE80211_REASON_NOT_ASSOCED);
637 vap->iv_stats.is_rx_notassoc++;
638 goto err;
639 }
640
641 /*
642 * Check for power save state change.
643 * XXX out-of-order A-MPDU frames?
644 */
645 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^
646 (ni->ni_flags & IEEE80211_NODE_PWR_MGT)))
647 vap->iv_node_ps(ni,
648 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT);
649 /*
650 * For 4-address packets handle WDS discovery
651 * notifications. Once a WDS link is setup frames
652 * are just delivered to the WDS vap (see below).
653 */
654 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) {
655 if (!ieee80211_node_is_authorized(ni)) {
656 IEEE80211_DISCARD(vap,
657 IEEE80211_MSG_INPUT |
658 IEEE80211_MSG_WDS, wh,
659 "4-address data",
660 "%s", "unauthorized port");
661 vap->iv_stats.is_rx_unauth++;
662 IEEE80211_NODE_STAT(ni, rx_unauth);
663 goto err;
664 }
665 ieee80211_dwds_discover(ni, m);
666 return type;
667 }
668
669 /*
670 * Handle A-MPDU re-ordering. If the frame is to be
671 * processed directly then ieee80211_ampdu_reorder
672 * will return 0; otherwise it has consumed the mbuf
673 * and we should do nothing more with it.
674 */
675 if ((m->m_flags & M_AMPDU) &&
676 ieee80211_ampdu_reorder(ni, m, rxs) != 0) {
677 m = NULL;
678 goto out;
679 }
680 resubmit_ampdu:
681
682 /*
683 * Handle privacy requirements. Note that we
684 * must not be preempted from here until after
685 * we (potentially) call ieee80211_crypto_demic;
686 * otherwise we may violate assumptions in the
687 * crypto cipher modules used to do delayed update
688 * of replay sequence numbers.
689 */
690 if (is_hw_decrypted || IEEE80211_IS_PROTECTED(wh)) {
691 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
692 /*
693 * Discard encrypted frames when privacy is off.
694 */
695 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
696 wh, "WEP", "%s", "PRIVACY off");
697 vap->iv_stats.is_rx_noprivacy++;
698 IEEE80211_NODE_STAT(ni, rx_noprivacy);
699 goto out;
700 }
701 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
702 /* NB: stats+msgs handled in crypto_decap */
703 IEEE80211_NODE_STAT(ni, rx_wepfail);
704 goto out;
705 }
706 wh = mtod(m, struct ieee80211_frame *);
707 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
708 has_decrypted = 1;
709 } else {
710 /* XXX M_WEP and IEEE80211_F_PRIVACY */
711 key = NULL;
712 }
713
714 /*
715 * Save QoS bits for use below--before we strip the header.
716 */
717 if (subtype == IEEE80211_FC0_SUBTYPE_QOS_DATA)
718 qos = ieee80211_getqos(wh)[0];
719 else
720 qos = 0;
721
722 /*
723 * Next up, any fragmentation.
724 */
725 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
726 m = ieee80211_defrag(ni, m, hdrspace, has_decrypted);
727 if (m == NULL) {
728 /* Fragment dropped or frame not complete yet */
729 goto out;
730 }
731 }
732 wh = NULL; /* no longer valid, catch any uses */
733
734 /*
735 * Next strip any MSDU crypto bits.
736 */
737 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
738 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
739 ni->ni_macaddr, "data", "%s", "demic error");
740 vap->iv_stats.is_rx_demicfail++;
741 IEEE80211_NODE_STAT(ni, rx_demicfail);
742 goto out;
743 }
744 /* copy to listener after decrypt */
745 if (ieee80211_radiotap_active_vap(vap))
746 ieee80211_radiotap_rx(vap, m);
747 need_tap = 0;
748 /*
749 * Finally, strip the 802.11 header.
750 */
751 m = ieee80211_decap(vap, m, hdrspace, qos);
752 if (m == NULL) {
753 /* XXX mask bit to check for both */
754 /* don't count Null data frames as errors */
755 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
756 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
757 goto out;
758 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
759 ni->ni_macaddr, "data", "%s", "decap error");
760 vap->iv_stats.is_rx_decap++;
761 IEEE80211_NODE_STAT(ni, rx_decap);
762 goto err;
763 }
764 if (!(qos & IEEE80211_QOS_AMSDU))
765 eh = mtod(m, struct ether_header *);
766 else
767 eh = NULL;
768 if (!ieee80211_node_is_authorized(ni)) {
769 /*
770 * Deny any non-PAE frames received prior to
771 * authorization. For open/shared-key
772 * authentication the port is mark authorized
773 * after authentication completes. For 802.1x
774 * the port is not marked authorized by the
775 * authenticator until the handshake has completed.
776 */
777 if (eh == NULL ||
778 eh->ether_type != htons(ETHERTYPE_PAE)) {
779 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
780 ni->ni_macaddr, "data", "unauthorized or "
781 "unknown port: ether type 0x%x len %u",
782 eh == NULL ? -1 : eh->ether_type,
783 m->m_pkthdr.len);
784 vap->iv_stats.is_rx_unauth++;
785 IEEE80211_NODE_STAT(ni, rx_unauth);
786 goto err;
787 }
788 } else {
789 /*
790 * When denying unencrypted frames, discard
791 * any non-PAE frames received without encryption.
792 */
793 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
794 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
795 (is_hw_decrypted == 0) &&
796 (eh == NULL ||
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 ether_sprintf(wh->i_addr2), rssi);
854 }
855 #endif
856 if (IEEE80211_IS_PROTECTED(wh)) {
857 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
858 /*
859 * Only shared key auth frames with a challenge
860 * should be encrypted, discard all others.
861 */
862 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
863 wh, NULL,
864 "%s", "WEP set but not permitted");
865 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
866 goto out;
867 }
868 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
869 /*
870 * Discard encrypted frames when privacy is off.
871 */
872 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
873 wh, NULL, "%s", "WEP set but PRIVACY off");
874 vap->iv_stats.is_rx_noprivacy++;
875 goto out;
876 }
877 hdrspace = ieee80211_hdrspace(ic, wh);
878 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
879 /* NB: stats+msgs handled in crypto_decap */
880 goto out;
881 }
882 wh = mtod(m, struct ieee80211_frame *);
883 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
884 has_decrypted = 1;
885 }
886 /*
887 * Pass the packet to radiotap before calling iv_recv_mgmt().
888 * Otherwise iv_recv_mgmt() might pass another packet to
889 * radiotap, resulting in out of order packet captures.
890 */
891 if (ieee80211_radiotap_active_vap(vap))
892 ieee80211_radiotap_rx(vap, m);
893 need_tap = 0;
894 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
895 goto out;
896
897 case IEEE80211_FC0_TYPE_CTL:
898 vap->iv_stats.is_rx_ctl++;
899 IEEE80211_NODE_STAT(ni, rx_ctrl);
900 vap->iv_recv_ctl(ni, m, subtype);
901 goto out;
902 default:
903 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
904 wh, "bad", "frame type 0x%x", type);
905 /* should not come here */
906 break;
907 }
908 err:
909 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
910 out:
911 if (m != NULL) {
912 if (need_tap && ieee80211_radiotap_active_vap(vap))
913 ieee80211_radiotap_rx(vap, m);
914 m_freem(m);
915 }
916 return type;
917 }
918
919 static void
hostap_auth_open(struct ieee80211_node * ni,struct ieee80211_frame * wh,int rssi,int nf,uint16_t seq,uint16_t status)920 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
921 int rssi, int nf, uint16_t seq, uint16_t status)
922 {
923 struct ieee80211vap *vap = ni->ni_vap;
924
925 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
926
927 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
928 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
929 ni->ni_macaddr, "open auth",
930 "bad sta auth mode %u", ni->ni_authmode);
931 vap->iv_stats.is_rx_bad_auth++; /* XXX */
932 /*
933 * Clear any challenge text that may be there if
934 * a previous shared key auth failed and then an
935 * open auth is attempted.
936 */
937 if (ni->ni_challenge != NULL) {
938 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
939 ni->ni_challenge = NULL;
940 }
941 /* XXX hack to workaround calling convention */
942 ieee80211_send_error(ni, wh->i_addr2,
943 IEEE80211_FC0_SUBTYPE_AUTH,
944 (seq + 1) | (IEEE80211_STATUS_ALG<<16));
945 return;
946 }
947 if (seq != IEEE80211_AUTH_OPEN_REQUEST) {
948 vap->iv_stats.is_rx_bad_auth++;
949 return;
950 }
951 /* always accept open authentication requests */
952 if (ni == vap->iv_bss) {
953 ni = ieee80211_dup_bss(vap, wh->i_addr2);
954 if (ni == NULL)
955 return;
956 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
957 (void) ieee80211_ref_node(ni);
958 /*
959 * Mark the node as referenced to reflect that it's
960 * reference count has been bumped to insure it remains
961 * after the transaction completes.
962 */
963 ni->ni_flags |= IEEE80211_NODE_AREF;
964 /*
965 * Mark the node as requiring a valid association id
966 * before outbound traffic is permitted.
967 */
968 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
969
970 if (vap->iv_acl != NULL &&
971 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
972 /*
973 * When the ACL policy is set to RADIUS we defer the
974 * authorization to a user agent. Dispatch an event,
975 * a subsequent MLME call will decide the fate of the
976 * station. If the user agent is not present then the
977 * node will be reclaimed due to inactivity.
978 */
979 IEEE80211_NOTE_MAC(vap,
980 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr,
981 "%s", "station authentication deferred (radius acl)");
982 ieee80211_notify_node_auth(ni);
983 } else {
984 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
985 IEEE80211_NOTE_MAC(vap,
986 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr,
987 "%s", "station authenticated (open)");
988 /*
989 * When 802.1x is not in use mark the port
990 * authorized at this point so traffic can flow.
991 */
992 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
993 ieee80211_node_authorize(ni);
994 }
995 }
996
997 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)998 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
999 uint8_t *frm, uint8_t *efrm, int rssi, int nf,
1000 uint16_t seq, uint16_t status)
1001 {
1002 struct ieee80211vap *vap = ni->ni_vap;
1003 uint8_t *challenge;
1004 int estatus;
1005
1006 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
1007
1008 /*
1009 * NB: this can happen as we allow pre-shared key
1010 * authentication to be enabled w/o wep being turned
1011 * on so that configuration of these can be done
1012 * in any order. It may be better to enforce the
1013 * ordering in which case this check would just be
1014 * for sanity/consistency.
1015 */
1016 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1017 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1018 ni->ni_macaddr, "shared key auth",
1019 "%s", " PRIVACY is disabled");
1020 estatus = IEEE80211_STATUS_ALG;
1021 goto bad;
1022 }
1023 /*
1024 * Pre-shared key authentication is evil; accept
1025 * it only if explicitly configured (it is supported
1026 * mainly for compatibility with clients like Mac OS X).
1027 */
1028 if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1029 ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1030 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1031 ni->ni_macaddr, "shared key auth",
1032 "bad sta auth mode %u", ni->ni_authmode);
1033 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1034 estatus = IEEE80211_STATUS_ALG;
1035 goto bad;
1036 }
1037
1038 challenge = NULL;
1039 if (frm + 1 < efrm) {
1040 if ((frm[1] + 2) > (efrm - frm)) {
1041 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1042 ni->ni_macaddr, "shared key auth",
1043 "ie %d/%d too long",
1044 frm[0], (frm[1] + 2) - (efrm - frm));
1045 vap->iv_stats.is_rx_bad_auth++;
1046 estatus = IEEE80211_STATUS_CHALLENGE;
1047 goto bad;
1048 }
1049 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1050 challenge = frm;
1051 frm += frm[1] + 2;
1052 }
1053 switch (seq) {
1054 case IEEE80211_AUTH_SHARED_CHALLENGE:
1055 case IEEE80211_AUTH_SHARED_RESPONSE:
1056 if (challenge == NULL) {
1057 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1058 ni->ni_macaddr, "shared key auth",
1059 "%s", "no challenge");
1060 vap->iv_stats.is_rx_bad_auth++;
1061 estatus = IEEE80211_STATUS_CHALLENGE;
1062 goto bad;
1063 }
1064 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1065 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1066 ni->ni_macaddr, "shared key auth",
1067 "bad challenge len %d", challenge[1]);
1068 vap->iv_stats.is_rx_bad_auth++;
1069 estatus = IEEE80211_STATUS_CHALLENGE;
1070 goto bad;
1071 }
1072 default:
1073 break;
1074 }
1075 switch (seq) {
1076 case IEEE80211_AUTH_SHARED_REQUEST:
1077 {
1078 #ifdef IEEE80211_DEBUG
1079 bool allocbs;
1080 #endif
1081
1082 if (ni == vap->iv_bss) {
1083 ni = ieee80211_dup_bss(vap, wh->i_addr2);
1084 if (ni == NULL) {
1085 /* NB: no way to return an error */
1086 return;
1087 }
1088 #ifdef IEEE80211_DEBUG
1089 allocbs = 1;
1090 #endif
1091 } else {
1092 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
1093 (void) ieee80211_ref_node(ni);
1094 #ifdef IEEE80211_DEBUG
1095 allocbs = 0;
1096 #endif
1097 }
1098 /*
1099 * Mark the node as referenced to reflect that it's
1100 * reference count has been bumped to insure it remains
1101 * after the transaction completes.
1102 */
1103 ni->ni_flags |= IEEE80211_NODE_AREF;
1104 /*
1105 * Mark the node as requiring a valid association id
1106 * before outbound traffic is permitted.
1107 */
1108 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
1109 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
1110 ni->ni_noise = nf;
1111 if (!ieee80211_alloc_challenge(ni)) {
1112 /* NB: don't return error so they rexmit */
1113 return;
1114 }
1115 net80211_get_random_bytes(ni->ni_challenge,
1116 IEEE80211_CHALLENGE_LEN);
1117 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1118 ni, "shared key %sauth request", allocbs ? "" : "re");
1119 /*
1120 * When the ACL policy is set to RADIUS we defer the
1121 * authorization to a user agent. Dispatch an event,
1122 * a subsequent MLME call will decide the fate of the
1123 * station. If the user agent is not present then the
1124 * node will be reclaimed due to inactivity.
1125 */
1126 if (vap->iv_acl != NULL &&
1127 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
1128 IEEE80211_NOTE_MAC(vap,
1129 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL,
1130 ni->ni_macaddr,
1131 "%s", "station authentication deferred (radius acl)");
1132 ieee80211_notify_node_auth(ni);
1133 return;
1134 }
1135 break;
1136 }
1137 case IEEE80211_AUTH_SHARED_RESPONSE:
1138 if (ni == vap->iv_bss) {
1139 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1140 ni->ni_macaddr, "shared key response",
1141 "%s", "unknown station");
1142 /* NB: don't send a response */
1143 return;
1144 }
1145 if (ni->ni_challenge == NULL) {
1146 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1147 ni->ni_macaddr, "shared key response",
1148 "%s", "no challenge recorded");
1149 vap->iv_stats.is_rx_bad_auth++;
1150 estatus = IEEE80211_STATUS_CHALLENGE;
1151 goto bad;
1152 }
1153 if (memcmp(ni->ni_challenge, &challenge[2],
1154 challenge[1]) != 0) {
1155 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1156 ni->ni_macaddr, "shared key response",
1157 "%s", "challenge mismatch");
1158 vap->iv_stats.is_rx_auth_fail++;
1159 estatus = IEEE80211_STATUS_CHALLENGE;
1160 goto bad;
1161 }
1162 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1163 ni, "%s", "station authenticated (shared key)");
1164 ieee80211_node_authorize(ni);
1165 break;
1166 default:
1167 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1168 ni->ni_macaddr, "shared key auth",
1169 "bad seq %d", seq);
1170 vap->iv_stats.is_rx_bad_auth++;
1171 estatus = IEEE80211_STATUS_SEQUENCE;
1172 goto bad;
1173 }
1174 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1175 return;
1176 bad:
1177 /*
1178 * Send an error response; but only when operating as an AP.
1179 */
1180 /* XXX hack to workaround calling convention */
1181 ieee80211_send_error(ni, wh->i_addr2,
1182 IEEE80211_FC0_SUBTYPE_AUTH,
1183 (seq + 1) | (estatus<<16));
1184 }
1185
1186 /*
1187 * Convert a WPA cipher selector OUI to an internal
1188 * cipher algorithm. Where appropriate we also
1189 * record any key length.
1190 */
1191 static int
wpa_cipher(const uint8_t * sel,uint8_t * keylen,uint8_t * cipher)1192 wpa_cipher(const uint8_t *sel, uint8_t *keylen, uint8_t *cipher)
1193 {
1194 #define WPA_SEL(x) (((x)<<24)|WPA_OUI)
1195 uint32_t w = le32dec(sel);
1196
1197 switch (w) {
1198 case WPA_SEL(WPA_CSE_NULL):
1199 *cipher = IEEE80211_CIPHER_NONE;
1200 break;
1201 case WPA_SEL(WPA_CSE_WEP40):
1202 if (keylen)
1203 *keylen = 40 / NBBY;
1204 *cipher = IEEE80211_CIPHER_WEP;
1205 break;
1206 case WPA_SEL(WPA_CSE_WEP104):
1207 if (keylen)
1208 *keylen = 104 / NBBY;
1209 *cipher = IEEE80211_CIPHER_WEP;
1210 break;
1211 case WPA_SEL(WPA_CSE_TKIP):
1212 *cipher = IEEE80211_CIPHER_TKIP;
1213 break;
1214 case WPA_SEL(WPA_CSE_CCMP):
1215 *cipher = IEEE80211_CIPHER_AES_CCM;
1216 break;
1217 default:
1218 return (EINVAL);
1219 }
1220
1221 return (0);
1222 #undef WPA_SEL
1223 }
1224
1225 /*
1226 * Convert a WPA key management/authentication algorithm
1227 * to an internal code.
1228 */
1229 static int
wpa_keymgmt(const uint8_t * sel)1230 wpa_keymgmt(const uint8_t *sel)
1231 {
1232 #define WPA_SEL(x) (((x)<<24)|WPA_OUI)
1233 uint32_t w = le32dec(sel);
1234
1235 switch (w) {
1236 case WPA_SEL(WPA_ASE_8021X_UNSPEC):
1237 return WPA_ASE_8021X_UNSPEC;
1238 case WPA_SEL(WPA_ASE_8021X_PSK):
1239 return WPA_ASE_8021X_PSK;
1240 case WPA_SEL(WPA_ASE_NONE):
1241 return WPA_ASE_NONE;
1242 }
1243 return 0; /* NB: so is discarded */
1244 #undef WPA_SEL
1245 }
1246
1247 /*
1248 * Parse a WPA information element to collect parameters.
1249 * Note that we do not validate security parameters; that
1250 * is handled by the authenticator; the parsing done here
1251 * is just for internal use in making operational decisions.
1252 */
1253 static int
ieee80211_parse_wpa(struct ieee80211vap * vap,const uint8_t * frm,struct ieee80211_rsnparms * rsn,const struct ieee80211_frame * wh)1254 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm,
1255 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1256 {
1257 uint8_t len = frm[1];
1258 uint32_t w;
1259 int error, n;
1260
1261 /*
1262 * Check the length once for fixed parts: OUI, type,
1263 * version, mcast cipher, and 2 selector counts.
1264 * Other, variable-length data, must be checked separately.
1265 */
1266 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) {
1267 IEEE80211_DISCARD_IE(vap,
1268 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1269 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags);
1270 return IEEE80211_REASON_IE_INVALID;
1271 }
1272 if (len < 14) {
1273 IEEE80211_DISCARD_IE(vap,
1274 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1275 wh, "WPA", "too short, len %u", len);
1276 return IEEE80211_REASON_IE_INVALID;
1277 }
1278 frm += 6, len -= 4; /* NB: len is payload only */
1279 /* NB: iswpaoui already validated the OUI and type */
1280 w = le16dec(frm);
1281 if (w != WPA_VERSION) {
1282 IEEE80211_DISCARD_IE(vap,
1283 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1284 wh, "WPA", "bad version %u", w);
1285 return IEEE80211_REASON_IE_INVALID;
1286 }
1287 frm += 2, len -= 2;
1288
1289 memset(rsn, 0, sizeof(*rsn));
1290
1291 /* multicast/group cipher */
1292 error = wpa_cipher(frm, &rsn->rsn_mcastkeylen, &rsn->rsn_mcastcipher);
1293 if (error != 0) {
1294 IEEE80211_DISCARD_IE(vap,
1295 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1296 wh, "WPA", "unknown mcast cipher suite %08X",
1297 le32dec(frm));
1298 return IEEE80211_REASON_GROUP_CIPHER_INVALID;
1299 }
1300 frm += 4, len -= 4;
1301
1302 /* unicast ciphers */
1303 n = le16dec(frm);
1304 frm += 2, len -= 2;
1305 if (len < n*4+2) {
1306 IEEE80211_DISCARD_IE(vap,
1307 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1308 wh, "WPA", "ucast cipher data too short; len %u, n %u",
1309 len, n);
1310 return IEEE80211_REASON_IE_INVALID;
1311 }
1312 w = 0;
1313 for (; n > 0; n--) {
1314 uint8_t cipher;
1315
1316 error = wpa_cipher(frm, &rsn->rsn_ucastkeylen, &cipher);
1317 if (error == 0)
1318 w |= 1 << cipher;
1319
1320 frm += 4, len -= 4;
1321 }
1322 if (w == 0) {
1323 IEEE80211_DISCARD_IE(vap,
1324 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1325 wh, "WPA", "no usable pairwise cipher suite found (w=%d)",
1326 w);
1327 return IEEE80211_REASON_PAIRWISE_CIPHER_INVALID;
1328 }
1329 /* XXX other? */
1330 if (w & (1 << IEEE80211_CIPHER_AES_CCM))
1331 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1332 else
1333 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1334
1335 /* key management algorithms */
1336 n = le16dec(frm);
1337 frm += 2, len -= 2;
1338 if (len < n*4) {
1339 IEEE80211_DISCARD_IE(vap,
1340 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1341 wh, "WPA", "key mgmt alg data too short; len %u, n %u",
1342 len, n);
1343 return IEEE80211_REASON_IE_INVALID;
1344 }
1345 w = 0;
1346 for (; n > 0; n--) {
1347 w |= wpa_keymgmt(frm);
1348 frm += 4, len -= 4;
1349 }
1350 if (w & WPA_ASE_8021X_UNSPEC)
1351 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC;
1352 else
1353 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
1354
1355 if (len > 2) /* optional capabilities */
1356 rsn->rsn_caps = le16dec(frm);
1357
1358 return 0;
1359 }
1360
1361 /*
1362 * Convert an RSN cipher selector OUI to an internal
1363 * cipher algorithm. Where appropriate we also
1364 * record any key length.
1365 */
1366 static int
rsn_cipher(const uint8_t * sel,uint8_t * keylen,uint8_t * cipher)1367 rsn_cipher(const uint8_t *sel, uint8_t *keylen, uint8_t *cipher)
1368 {
1369 #define RSN_SEL(x) (((x)<<24)|RSN_OUI)
1370 uint32_t w = le32dec(sel);
1371
1372 switch (w) {
1373 case RSN_SEL(RSN_CSE_NULL):
1374 *cipher = IEEE80211_CIPHER_NONE;
1375 break;
1376 case RSN_SEL(RSN_CSE_WEP40):
1377 if (keylen)
1378 *keylen = 40 / NBBY;
1379 *cipher = IEEE80211_CIPHER_WEP;
1380 break;
1381 case RSN_SEL(RSN_CSE_WEP104):
1382 if (keylen)
1383 *keylen = 104 / NBBY;
1384 *cipher = IEEE80211_CIPHER_WEP;
1385 break;
1386 case RSN_SEL(RSN_CSE_TKIP):
1387 *cipher = IEEE80211_CIPHER_TKIP;
1388 break;
1389 case RSN_SEL(RSN_CSE_CCMP):
1390 *cipher = IEEE80211_CIPHER_AES_CCM;
1391 break;
1392 case RSN_SEL(RSN_CSE_WRAP):
1393 *cipher = IEEE80211_CIPHER_AES_OCB;
1394 break;
1395 default:
1396 return (EINVAL);
1397 }
1398
1399 return (0);
1400 #undef WPA_SEL
1401 }
1402
1403 /*
1404 * Convert an RSN key management/authentication algorithm
1405 * to an internal code.
1406 */
1407 static int
rsn_keymgmt(const uint8_t * sel)1408 rsn_keymgmt(const uint8_t *sel)
1409 {
1410 #define RSN_SEL(x) (((x)<<24)|RSN_OUI)
1411 uint32_t w = le32dec(sel);
1412
1413 switch (w) {
1414 case RSN_SEL(RSN_ASE_8021X_UNSPEC):
1415 return RSN_ASE_8021X_UNSPEC;
1416 case RSN_SEL(RSN_ASE_8021X_PSK):
1417 return RSN_ASE_8021X_PSK;
1418 case RSN_SEL(RSN_ASE_NONE):
1419 return RSN_ASE_NONE;
1420 }
1421 return 0; /* NB: so is discarded */
1422 #undef RSN_SEL
1423 }
1424
1425 /*
1426 * Parse a WPA/RSN information element to collect parameters
1427 * and validate the parameters against what has been
1428 * configured for the system.
1429 */
1430 static int
ieee80211_parse_rsn(struct ieee80211vap * vap,const uint8_t * frm,struct ieee80211_rsnparms * rsn,const struct ieee80211_frame * wh)1431 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm,
1432 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1433 {
1434 uint8_t len = frm[1];
1435 uint32_t w;
1436 int error, n;
1437
1438 /*
1439 * Check the length once for fixed parts:
1440 * version, mcast cipher, and 2 selector counts.
1441 * Other, variable-length data, must be checked separately.
1442 */
1443 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) {
1444 IEEE80211_DISCARD_IE(vap,
1445 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1446 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags);
1447 return IEEE80211_REASON_IE_INVALID;
1448 }
1449 /* XXX may be shorter */
1450 if (len < 10) {
1451 IEEE80211_DISCARD_IE(vap,
1452 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1453 wh, "RSN", "too short, len %u", len);
1454 return IEEE80211_REASON_IE_INVALID;
1455 }
1456 frm += 2;
1457 w = le16dec(frm);
1458 if (w != RSN_VERSION) {
1459 IEEE80211_DISCARD_IE(vap,
1460 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1461 wh, "RSN", "bad version %u", w);
1462 return IEEE80211_REASON_UNSUPP_RSN_IE_VERSION;
1463 }
1464 frm += 2, len -= 2;
1465
1466 memset(rsn, 0, sizeof(*rsn));
1467
1468 /* multicast/group cipher */
1469 error = rsn_cipher(frm, &rsn->rsn_mcastkeylen, &rsn->rsn_mcastcipher);
1470 if (error != 0) {
1471 IEEE80211_DISCARD_IE(vap,
1472 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1473 wh, "RSN", "unknown mcast cipher suite %08X",
1474 le32dec(frm));
1475 return IEEE80211_REASON_GROUP_CIPHER_INVALID;
1476 }
1477 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_NONE) {
1478 IEEE80211_DISCARD_IE(vap,
1479 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1480 wh, "RSN", "invalid mcast cipher suite %d",
1481 rsn->rsn_mcastcipher);
1482 return IEEE80211_REASON_GROUP_CIPHER_INVALID;
1483 }
1484 frm += 4, len -= 4;
1485
1486 /* unicast ciphers */
1487 n = le16dec(frm);
1488 frm += 2, len -= 2;
1489 if (len < n*4+2) {
1490 IEEE80211_DISCARD_IE(vap,
1491 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1492 wh, "RSN", "ucast cipher data too short; len %u, n %u",
1493 len, n);
1494 return IEEE80211_REASON_IE_INVALID;
1495 }
1496 w = 0;
1497
1498 for (; n > 0; n--) {
1499 uint8_t cipher;
1500
1501 error = rsn_cipher(frm, &rsn->rsn_ucastkeylen, &cipher);
1502 if (error == 0)
1503 w |= 1 << cipher;
1504
1505 frm += 4, len -= 4;
1506 }
1507 if (w & (1 << IEEE80211_CIPHER_AES_CCM))
1508 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1509 else if (w & (1 << IEEE80211_CIPHER_AES_OCB))
1510 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_OCB;
1511 else if (w & (1 << IEEE80211_CIPHER_TKIP))
1512 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1513 else if ((w & (1 << IEEE80211_CIPHER_NONE)) &&
1514 (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP ||
1515 rsn->rsn_mcastcipher == IEEE80211_CIPHER_TKIP))
1516 rsn->rsn_ucastcipher = IEEE80211_CIPHER_NONE;
1517 else {
1518 IEEE80211_DISCARD_IE(vap,
1519 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1520 wh, "RSN", "no usable pairwise cipher suite found (w=%d)",
1521 w);
1522 return IEEE80211_REASON_PAIRWISE_CIPHER_INVALID;
1523 }
1524
1525 /* key management algorithms */
1526 n = le16dec(frm);
1527 frm += 2, len -= 2;
1528 if (len < n*4) {
1529 IEEE80211_DISCARD_IE(vap,
1530 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1531 wh, "RSN", "key mgmt alg data too short; len %u, n %u",
1532 len, n);
1533 return IEEE80211_REASON_IE_INVALID;
1534 }
1535 w = 0;
1536 for (; n > 0; n--) {
1537 w |= rsn_keymgmt(frm);
1538 frm += 4, len -= 4;
1539 }
1540 if (w & RSN_ASE_8021X_UNSPEC)
1541 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC;
1542 else
1543 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK;
1544
1545 /* optional RSN capabilities */
1546 if (len > 2)
1547 rsn->rsn_caps = le16dec(frm);
1548 /* XXXPMKID */
1549
1550 return 0;
1551 }
1552
1553 /*
1554 * WPA/802.11i association request processing.
1555 */
1556 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)1557 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms,
1558 const struct ieee80211_frame *wh, const uint8_t *wpa,
1559 const uint8_t *rsn, uint16_t capinfo)
1560 {
1561 struct ieee80211vap *vap = ni->ni_vap;
1562 uint8_t reason;
1563 int badwparsn;
1564
1565 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN);
1566 if (wpa == NULL && rsn == NULL) {
1567 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) {
1568 /*
1569 * W-Fi Protected Setup (WPS) permits
1570 * clients to associate and pass EAPOL frames
1571 * to establish initial credentials.
1572 */
1573 ni->ni_flags |= IEEE80211_NODE_WPS;
1574 return 1;
1575 }
1576 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) &&
1577 (capinfo & IEEE80211_CAPINFO_PRIVACY)) {
1578 /*
1579 * Transitional Security Network. Permits clients
1580 * to associate and use WEP while WPA is configured.
1581 */
1582 ni->ni_flags |= IEEE80211_NODE_TSN;
1583 return 1;
1584 }
1585 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1586 wh, NULL, "%s", "no WPA/RSN IE in association request");
1587 vap->iv_stats.is_rx_assoc_badwpaie++;
1588 reason = IEEE80211_REASON_IE_INVALID;
1589 goto bad;
1590 }
1591 /* assert right association security credentials */
1592 badwparsn = 0; /* NB: to silence compiler */
1593 switch (vap->iv_flags & IEEE80211_F_WPA) {
1594 case IEEE80211_F_WPA1:
1595 badwparsn = (wpa == NULL);
1596 break;
1597 case IEEE80211_F_WPA2:
1598 badwparsn = (rsn == NULL);
1599 break;
1600 case IEEE80211_F_WPA1|IEEE80211_F_WPA2:
1601 badwparsn = (wpa == NULL && rsn == NULL);
1602 break;
1603 }
1604 if (badwparsn) {
1605 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1606 wh, NULL,
1607 "%s", "missing WPA/RSN IE in association request");
1608 vap->iv_stats.is_rx_assoc_badwpaie++;
1609 reason = IEEE80211_REASON_IE_INVALID;
1610 goto bad;
1611 }
1612 /*
1613 * Parse WPA/RSN information element.
1614 */
1615 if (wpa != NULL)
1616 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh);
1617 else
1618 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh);
1619 if (reason != 0) {
1620 /* XXX wpa->rsn fallback? */
1621 /* XXX distinguish WPA/RSN? */
1622 vap->iv_stats.is_rx_assoc_badwpaie++;
1623 goto bad;
1624 }
1625 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni,
1626 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x",
1627 wpa != NULL ? "WPA" : "RSN",
1628 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen,
1629 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen,
1630 rsnparms->rsn_keymgmt, rsnparms->rsn_caps);
1631
1632 return 1;
1633 bad:
1634 ieee80211_node_deauth(ni, reason);
1635 return 0;
1636 }
1637
1638 /* XXX find a better place for definition */
1639 struct l2_update_frame {
1640 struct ether_header eh;
1641 uint8_t dsap;
1642 uint8_t ssap;
1643 uint8_t control;
1644 uint8_t xid[3];
1645 } __packed;
1646
1647 /*
1648 * Deliver a TGf L2UF frame on behalf of a station.
1649 * This primes any bridge when the station is roaming
1650 * between ap's on the same wired network.
1651 */
1652 static void
ieee80211_deliver_l2uf(struct ieee80211_node * ni)1653 ieee80211_deliver_l2uf(struct ieee80211_node *ni)
1654 {
1655 struct ieee80211vap *vap = ni->ni_vap;
1656 struct ifnet *ifp = vap->iv_ifp;
1657 struct mbuf *m;
1658 struct l2_update_frame *l2uf;
1659 struct ether_header *eh;
1660
1661 m = m_gethdr(IEEE80211_M_NOWAIT, MT_DATA);
1662 if (m == NULL) {
1663 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1664 "%s", "no mbuf for l2uf frame");
1665 vap->iv_stats.is_rx_nobuf++; /* XXX not right */
1666 return;
1667 }
1668 l2uf = mtod(m, struct l2_update_frame *);
1669 eh = &l2uf->eh;
1670 /* dst: Broadcast address */
1671 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr);
1672 /* src: associated STA */
1673 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr);
1674 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh));
1675
1676 l2uf->dsap = 0;
1677 l2uf->ssap = 0;
1678 l2uf->control = 0xf5;
1679 l2uf->xid[0] = 0x81;
1680 l2uf->xid[1] = 0x80;
1681 l2uf->xid[2] = 0x00;
1682
1683 m->m_pkthdr.len = m->m_len = sizeof(*l2uf);
1684 hostap_deliver_data(vap, ni, m);
1685 }
1686
1687 static void
ratesetmismatch(struct ieee80211_node * ni,const struct ieee80211_frame * wh,int reassoc,int resp,const char * tag,int rate)1688 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1689 int reassoc, int resp, const char *tag, int rate)
1690 {
1691 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1692 "deny %s request, %s rate set mismatch, rate/MCS %d",
1693 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL);
1694 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE);
1695 ieee80211_node_leave(ni);
1696 }
1697
1698 static void
capinfomismatch(struct ieee80211_node * ni,const struct ieee80211_frame * wh,int reassoc,int resp,const char * tag,int capinfo)1699 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1700 int reassoc, int resp, const char *tag, int capinfo)
1701 {
1702 struct ieee80211vap *vap = ni->ni_vap;
1703
1704 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1705 "deny %s request, %s mismatch 0x%x",
1706 reassoc ? "reassoc" : "assoc", tag, capinfo);
1707 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO);
1708 ieee80211_node_leave(ni);
1709 vap->iv_stats.is_rx_assoc_capmismatch++;
1710 }
1711
1712 static void
htcapmismatch(struct ieee80211_node * ni,const struct ieee80211_frame * wh,int reassoc,int resp)1713 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1714 int reassoc, int resp)
1715 {
1716 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1717 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc");
1718 /* XXX no better code */
1719 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS);
1720 ieee80211_node_leave(ni);
1721 }
1722
1723 static void
authalgreject(struct ieee80211_node * ni,const struct ieee80211_frame * wh,int algo,int seq,int status)1724 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1725 int algo, int seq, int status)
1726 {
1727 struct ieee80211vap *vap = ni->ni_vap;
1728
1729 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1730 wh, NULL, "unsupported alg %d", algo);
1731 vap->iv_stats.is_rx_auth_unsupported++;
1732 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH,
1733 seq | (status << 16));
1734 }
1735
1736 static __inline int
ishtmixed(const uint8_t * ie)1737 ishtmixed(const uint8_t *ie)
1738 {
1739 const struct ieee80211_ie_htinfo *ht =
1740 (const struct ieee80211_ie_htinfo *) ie;
1741 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) ==
1742 IEEE80211_HTINFO_OPMODE_MIXED;
1743 }
1744
1745 static int
is11bclient(const uint8_t * rates,const uint8_t * xrates)1746 is11bclient(const uint8_t *rates, const uint8_t *xrates)
1747 {
1748 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
1749 int i;
1750
1751 /* NB: the 11b clients we care about will not have xrates */
1752 if (xrates != NULL || rates == NULL)
1753 return 0;
1754 for (i = 0; i < rates[1]; i++) {
1755 int r = rates[2+i] & IEEE80211_RATE_VAL;
1756 if (r > 2*11 || ((1<<r) & brates) == 0)
1757 return 0;
1758 }
1759 return 1;
1760 }
1761
1762 static void
hostap_recv_mgmt(struct ieee80211_node * ni,struct mbuf * m0,int subtype,const struct ieee80211_rx_stats * rxs,int rssi,int nf)1763 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1764 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
1765 {
1766 struct ieee80211vap *vap = ni->ni_vap;
1767 struct ieee80211com *ic = ni->ni_ic;
1768 struct ieee80211_frame *wh;
1769 uint8_t *frm, *efrm, *sfrm;
1770 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap;
1771 uint8_t *vhtcap, *vhtinfo;
1772 int reassoc, resp;
1773 uint8_t rate;
1774
1775 wh = mtod(m0, struct ieee80211_frame *);
1776 frm = (uint8_t *)&wh[1];
1777 efrm = mtod(m0, uint8_t *) + m0->m_len;
1778 switch (subtype) {
1779 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1780 /*
1781 * We process beacon/probe response frames when scanning;
1782 * otherwise we check beacon frames for overlapping non-ERP
1783 * BSS in 11g and/or overlapping legacy BSS when in HT.
1784 */
1785 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
1786 vap->iv_stats.is_rx_mgtdiscard++;
1787 return;
1788 }
1789 /* FALLTHROUGH */
1790 case IEEE80211_FC0_SUBTYPE_BEACON: {
1791 struct ieee80211_scanparams scan;
1792
1793 /* NB: accept off-channel frames */
1794 /* XXX TODO: use rxstatus to determine off-channel details */
1795 if (ieee80211_parse_beacon(ni, m0, ic->ic_curchan, &scan) &~ IEEE80211_BPARSE_OFFCHAN)
1796 return;
1797 /*
1798 * Count frame now that we know it's to be processed.
1799 */
1800 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1801 vap->iv_stats.is_rx_beacon++; /* XXX remove */
1802 IEEE80211_NODE_STAT(ni, rx_beacons);
1803 } else
1804 IEEE80211_NODE_STAT(ni, rx_proberesp);
1805 /*
1806 * If scanning, just pass information to the scan module.
1807 */
1808 if (ic->ic_flags & IEEE80211_F_SCAN) {
1809 if (scan.status == 0 && /* NB: on channel */
1810 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) {
1811 /*
1812 * Actively scanning a channel marked passive;
1813 * send a probe request now that we know there
1814 * is 802.11 traffic present.
1815 *
1816 * XXX check if the beacon we recv'd gives
1817 * us what we need and suppress the probe req
1818 */
1819 ieee80211_probe_curchan(vap, true);
1820 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1821 }
1822 ieee80211_add_scan(vap, ic->ic_curchan, &scan, wh,
1823 subtype, rssi, nf);
1824 return;
1825 }
1826 /*
1827 * Check beacon for overlapping bss w/ non ERP stations.
1828 * If we detect one and protection is configured but not
1829 * enabled, enable it and start a timer that'll bring us
1830 * out if we stop seeing the bss.
1831 */
1832 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1833 scan.status == 0 && /* NB: on-channel */
1834 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/
1835 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) {
1836 vap->iv_lastnonerp = ticks;
1837 vap->iv_flags_ext |= IEEE80211_FEXT_NONERP_PR;
1838 /*
1839 * XXX TODO: this may need to check all VAPs?
1840 */
1841 if (vap->iv_protmode != IEEE80211_PROT_NONE &&
1842 (vap->iv_flags & IEEE80211_F_USEPROT) == 0) {
1843 IEEE80211_NOTE_FRAME(vap,
1844 IEEE80211_MSG_ASSOC, wh,
1845 "non-ERP present on channel %d "
1846 "(saw erp 0x%x from channel %d), "
1847 "enable use of protection",
1848 ic->ic_curchan->ic_ieee,
1849 scan.erp, scan.chan);
1850 vap->iv_flags |= IEEE80211_F_USEPROT;
1851 ieee80211_vap_update_erp_protmode(vap);
1852 }
1853 }
1854 /*
1855 * Check beacon for non-HT station on HT channel
1856 * and update HT BSS occupancy as appropriate.
1857 */
1858 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) {
1859 if (scan.status & IEEE80211_BPARSE_OFFCHAN) {
1860 /*
1861 * Off control channel; only check frames
1862 * that come in the extension channel when
1863 * operating w/ HT40.
1864 */
1865 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan))
1866 break;
1867 if (scan.chan != ic->ic_curchan->ic_extieee)
1868 break;
1869 }
1870 if (scan.htinfo == NULL) {
1871 ieee80211_htprot_update(vap,
1872 IEEE80211_HTINFO_OPMODE_PROTOPT |
1873 IEEE80211_HTINFO_NONHT_PRESENT);
1874 } else if (ishtmixed(scan.htinfo)) {
1875 /* XXX? take NONHT_PRESENT from beacon? */
1876 ieee80211_htprot_update(vap,
1877 IEEE80211_HTINFO_OPMODE_MIXED |
1878 IEEE80211_HTINFO_NONHT_PRESENT);
1879 }
1880 }
1881 break;
1882 }
1883
1884 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1885 if (vap->iv_state != IEEE80211_S_RUN) {
1886 vap->iv_stats.is_rx_mgtdiscard++;
1887 return;
1888 }
1889 /*
1890 * Consult the ACL policy module if setup.
1891 */
1892 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) {
1893 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1894 wh, NULL, "%s", "disallowed by ACL");
1895 vap->iv_stats.is_rx_acl++;
1896 return;
1897 }
1898 /*
1899 * prreq frame format
1900 * [tlv] ssid
1901 * [tlv] supported rates
1902 * [tlv] extended supported rates
1903 */
1904 ssid = rates = xrates = NULL;
1905 while (efrm - frm > 1) {
1906 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1907 switch (*frm) {
1908 case IEEE80211_ELEMID_SSID:
1909 ssid = frm;
1910 break;
1911 case IEEE80211_ELEMID_RATES:
1912 rates = frm;
1913 break;
1914 case IEEE80211_ELEMID_XRATES:
1915 xrates = frm;
1916 break;
1917 }
1918 frm += frm[1] + 2;
1919 }
1920 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1921 if (xrates != NULL)
1922 IEEE80211_VERIFY_ELEMENT(xrates,
1923 IEEE80211_RATE_MAXSIZE - rates[1], return);
1924 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
1925 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
1926 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
1927 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1928 wh, NULL,
1929 "%s", "no ssid with ssid suppression enabled");
1930 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
1931 return;
1932 }
1933
1934 /* XXX find a better class or define it's own */
1935 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
1936 "%s", "recv probe req");
1937 /*
1938 * Some legacy 11b clients cannot hack a complete
1939 * probe response frame. When the request includes
1940 * only a bare-bones rate set, communicate this to
1941 * the transmit side.
1942 */
1943 ieee80211_send_proberesp(vap, wh->i_addr2,
1944 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
1945 break;
1946
1947 case IEEE80211_FC0_SUBTYPE_AUTH: {
1948 uint16_t algo, seq, status;
1949
1950 if (vap->iv_state != IEEE80211_S_RUN) {
1951 vap->iv_stats.is_rx_mgtdiscard++;
1952 return;
1953 }
1954 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1955 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1956 wh, NULL, "%s", "wrong bssid");
1957 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/
1958 return;
1959 }
1960 /*
1961 * auth frame format
1962 * [2] algorithm
1963 * [2] sequence
1964 * [2] status
1965 * [tlv*] challenge
1966 */
1967 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1968 algo = le16toh(*(uint16_t *)frm);
1969 seq = le16toh(*(uint16_t *)(frm + 2));
1970 status = le16toh(*(uint16_t *)(frm + 4));
1971 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1972 "recv auth frame with algorithm %d seq %d", algo, seq);
1973 /*
1974 * Consult the ACL policy module if setup.
1975 */
1976 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) {
1977 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1978 wh, NULL, "%s", "disallowed by ACL");
1979 vap->iv_stats.is_rx_acl++;
1980 ieee80211_send_error(ni, wh->i_addr2,
1981 IEEE80211_FC0_SUBTYPE_AUTH,
1982 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16));
1983 return;
1984 }
1985 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1986 IEEE80211_DISCARD(vap,
1987 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1988 wh, NULL, "%s", "TKIP countermeasures enabled");
1989 vap->iv_stats.is_rx_auth_countermeasures++;
1990 ieee80211_send_error(ni, wh->i_addr2,
1991 IEEE80211_FC0_SUBTYPE_AUTH,
1992 IEEE80211_REASON_MIC_FAILURE);
1993 return;
1994 }
1995 if (algo == IEEE80211_AUTH_ALG_SHARED)
1996 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1997 seq, status);
1998 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1999 hostap_auth_open(ni, wh, rssi, nf, seq, status);
2000 else if (algo == IEEE80211_AUTH_ALG_LEAP) {
2001 authalgreject(ni, wh, algo,
2002 seq+1, IEEE80211_STATUS_ALG);
2003 return;
2004 } else {
2005 /*
2006 * We assume that an unknown algorithm is the result
2007 * of a decryption failure on a shared key auth frame;
2008 * return a status code appropriate for that instead
2009 * of IEEE80211_STATUS_ALG.
2010 *
2011 * NB: a seq# of 4 is intentional; the decrypted
2012 * frame likely has a bogus seq value.
2013 */
2014 authalgreject(ni, wh, algo,
2015 4, IEEE80211_STATUS_CHALLENGE);
2016 return;
2017 }
2018 break;
2019 }
2020
2021 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
2022 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
2023 uint16_t capinfo, lintval;
2024 struct ieee80211_rsnparms rsnparms;
2025
2026 if (vap->iv_state != IEEE80211_S_RUN) {
2027 vap->iv_stats.is_rx_mgtdiscard++;
2028 return;
2029 }
2030 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
2031 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2032 wh, NULL, "%s", "wrong bssid");
2033 vap->iv_stats.is_rx_assoc_bss++;
2034 return;
2035 }
2036 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
2037 reassoc = 1;
2038 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
2039 } else {
2040 reassoc = 0;
2041 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
2042 }
2043 if (ni == vap->iv_bss) {
2044 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
2045 "deny %s request, sta not authenticated",
2046 reassoc ? "reassoc" : "assoc");
2047 ieee80211_send_error(ni, wh->i_addr2,
2048 IEEE80211_FC0_SUBTYPE_DEAUTH,
2049 IEEE80211_REASON_ASSOC_NOT_AUTHED);
2050 vap->iv_stats.is_rx_assoc_notauth++;
2051 return;
2052 }
2053
2054 /*
2055 * asreq frame format
2056 * [2] capability information
2057 * [2] listen interval
2058 * [6*] current AP address (reassoc only)
2059 * [tlv] ssid
2060 * [tlv] supported rates
2061 * [tlv] extended supported rates
2062 * [tlv] WPA or RSN
2063 * [tlv] HT capabilities
2064 * [tlv] Atheros capabilities
2065 */
2066 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return);
2067 capinfo = le16toh(*(uint16_t *)frm); frm += 2;
2068 lintval = le16toh(*(uint16_t *)frm); frm += 2;
2069 if (reassoc)
2070 frm += 6; /* ignore current AP info */
2071 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL;
2072 vhtcap = vhtinfo = NULL;
2073 sfrm = frm;
2074 while (efrm - frm > 1) {
2075 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
2076 switch (*frm) {
2077 case IEEE80211_ELEMID_SSID:
2078 ssid = frm;
2079 break;
2080 case IEEE80211_ELEMID_RATES:
2081 rates = frm;
2082 break;
2083 case IEEE80211_ELEMID_XRATES:
2084 xrates = frm;
2085 break;
2086 case IEEE80211_ELEMID_RSN:
2087 rsn = frm;
2088 break;
2089 case IEEE80211_ELEMID_HTCAP:
2090 htcap = frm;
2091 break;
2092 case IEEE80211_ELEMID_VHT_CAP:
2093 vhtcap = frm;
2094 break;
2095 case IEEE80211_ELEMID_VHT_OPMODE:
2096 vhtinfo = frm;
2097 break;
2098 case IEEE80211_ELEMID_VENDOR:
2099 if (iswpaoui(frm))
2100 wpa = frm;
2101 else if (iswmeinfo(frm))
2102 wme = frm;
2103 #ifdef IEEE80211_SUPPORT_SUPERG
2104 else if (isatherosoui(frm))
2105 ath = frm;
2106 #endif
2107 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
2108 if (ishtcapoui(frm) && htcap == NULL)
2109 htcap = frm;
2110 }
2111 break;
2112 }
2113 frm += frm[1] + 2;
2114 }
2115 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
2116 if (xrates != NULL)
2117 IEEE80211_VERIFY_ELEMENT(xrates,
2118 IEEE80211_RATE_MAXSIZE - rates[1], return);
2119 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
2120 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
2121 if (htcap != NULL) {
2122 IEEE80211_VERIFY_LENGTH(htcap[1],
2123 htcap[0] == IEEE80211_ELEMID_VENDOR ?
2124 4 + sizeof(struct ieee80211_ie_htcap)-2 :
2125 sizeof(struct ieee80211_ie_htcap)-2,
2126 return); /* XXX just NULL out? */
2127 }
2128
2129 /* Validate VHT IEs */
2130 if (vhtcap != NULL) {
2131 IEEE80211_VERIFY_LENGTH(vhtcap[1],
2132 sizeof(struct ieee80211_vht_cap),
2133 return);
2134 }
2135 if (vhtinfo != NULL) {
2136 IEEE80211_VERIFY_LENGTH(vhtinfo[1],
2137 sizeof(struct ieee80211_vht_operation),
2138 return);
2139 }
2140
2141 if ((vap->iv_flags & IEEE80211_F_WPA) &&
2142 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo))
2143 return;
2144 /* discard challenge after association */
2145 if (ni->ni_challenge != NULL) {
2146 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
2147 ni->ni_challenge = NULL;
2148 }
2149 /* NB: 802.11 spec says to ignore station's privacy bit */
2150 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
2151 capinfomismatch(ni, wh, reassoc, resp,
2152 "capability", capinfo);
2153 return;
2154 }
2155 /*
2156 * Disallow re-associate w/ invalid slot time setting.
2157 */
2158 if (ni->ni_associd != 0 &&
2159 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2160 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
2161 capinfomismatch(ni, wh, reassoc, resp,
2162 "slot time", capinfo);
2163 return;
2164 }
2165 rate = ieee80211_setup_rates(ni, rates, xrates,
2166 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
2167 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
2168 if (rate & IEEE80211_RATE_BASIC) {
2169 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate);
2170 vap->iv_stats.is_rx_assoc_norate++;
2171 return;
2172 }
2173 /*
2174 * If constrained to 11g-only stations reject an
2175 * 11b-only station. We cheat a bit here by looking
2176 * at the max negotiated xmit rate and assuming anyone
2177 * with a best rate <24Mb/s is an 11b station.
2178 */
2179 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) {
2180 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate);
2181 vap->iv_stats.is_rx_assoc_norate++;
2182 return;
2183 }
2184
2185 /*
2186 * Do HT rate set handling and setup HT node state.
2187 */
2188 ni->ni_chan = vap->iv_bss->ni_chan;
2189
2190 /* VHT */
2191 if (IEEE80211_IS_CHAN_VHT(ni->ni_chan) &&
2192 vhtcap != NULL &&
2193 vhtinfo != NULL) {
2194 /* XXX TODO; see below */
2195 printf("%s: VHT TODO!\n", __func__);
2196 ieee80211_vht_node_init(ni);
2197 ieee80211_vht_update_cap(ni, vhtcap, vhtinfo);
2198 } else if (ni->ni_flags & IEEE80211_NODE_VHT)
2199 ieee80211_vht_node_cleanup(ni);
2200
2201 /* HT */
2202 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2203 rate = ieee80211_setup_htrates(ni, htcap,
2204 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO |
2205 IEEE80211_F_DOBRS);
2206 if (rate & IEEE80211_RATE_BASIC) {
2207 ratesetmismatch(ni, wh, reassoc, resp,
2208 "HT", rate);
2209 vap->iv_stats.is_ht_assoc_norate++;
2210 return;
2211 }
2212 ieee80211_ht_node_init(ni);
2213 ieee80211_ht_updatehtcap(ni, htcap);
2214 } else if (ni->ni_flags & IEEE80211_NODE_HT)
2215 ieee80211_ht_node_cleanup(ni);
2216
2217 /* Finally - this will use HT/VHT info to change node channel */
2218 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2219 ieee80211_ht_updatehtcap_final(ni);
2220 }
2221
2222 #ifdef IEEE80211_SUPPORT_SUPERG
2223 /* Always do ff node cleanup; for A-MSDU */
2224 ieee80211_ff_node_cleanup(ni);
2225 #endif
2226 /*
2227 * Allow AMPDU operation only with unencrypted traffic
2228 * or AES-CCM; the 11n spec only specifies these ciphers
2229 * so permitting any others is undefined and can lead
2230 * to interoperability problems.
2231 */
2232 if ((ni->ni_flags & IEEE80211_NODE_HT) &&
2233 (((vap->iv_flags & IEEE80211_F_WPA) &&
2234 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) ||
2235 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) {
2236 IEEE80211_NOTE(vap,
2237 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
2238 "disallow HT use because WEP or TKIP requested, "
2239 "capinfo 0x%x ucastcipher %d", capinfo,
2240 rsnparms.rsn_ucastcipher);
2241 ieee80211_ht_node_cleanup(ni);
2242 #ifdef IEEE80211_SUPPORT_SUPERG
2243 /* Always do ff node cleanup; for A-MSDU */
2244 ieee80211_ff_node_cleanup(ni);
2245 #endif
2246 vap->iv_stats.is_ht_assoc_downgrade++;
2247 }
2248 /*
2249 * If constrained to 11n-only stations reject legacy stations.
2250 */
2251 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) &&
2252 (ni->ni_flags & IEEE80211_NODE_HT) == 0) {
2253 htcapmismatch(ni, wh, reassoc, resp);
2254 vap->iv_stats.is_ht_assoc_nohtcap++;
2255 return;
2256 }
2257 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
2258 ni->ni_noise = nf;
2259 ni->ni_intval = lintval;
2260 ni->ni_capinfo = capinfo;
2261 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell;
2262 ni->ni_fhindex = vap->iv_bss->ni_fhindex;
2263 /*
2264 * Store the IEs.
2265 * XXX maybe better to just expand
2266 */
2267 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) {
2268 #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off)
2269 if (wpa != NULL)
2270 setie(wpa_ie, wpa - sfrm);
2271 if (rsn != NULL)
2272 setie(rsn_ie, rsn - sfrm);
2273 if (htcap != NULL)
2274 setie(htcap_ie, htcap - sfrm);
2275 if (wme != NULL) {
2276 setie(wme_ie, wme - sfrm);
2277 /*
2278 * Mark node as capable of QoS.
2279 */
2280 ni->ni_flags |= IEEE80211_NODE_QOS;
2281 if (ieee80211_parse_wmeie(wme, wh, ni) > 0) {
2282 if (ni->ni_uapsd != 0)
2283 ni->ni_flags |=
2284 IEEE80211_NODE_UAPSD;
2285 else
2286 ni->ni_flags &=
2287 ~IEEE80211_NODE_UAPSD;
2288 }
2289 } else
2290 ni->ni_flags &=
2291 ~(IEEE80211_NODE_QOS |
2292 IEEE80211_NODE_UAPSD);
2293 #ifdef IEEE80211_SUPPORT_SUPERG
2294 if (ath != NULL) {
2295 setie(ath_ie, ath - sfrm);
2296 /*
2297 * Parse ATH station parameters.
2298 */
2299 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
2300 } else
2301 #endif
2302 ni->ni_ath_flags = 0;
2303 #undef setie
2304 } else {
2305 ni->ni_flags &= ~IEEE80211_NODE_QOS;
2306 ni->ni_flags &= ~IEEE80211_NODE_UAPSD;
2307 ni->ni_ath_flags = 0;
2308 }
2309 ieee80211_node_join(ni, resp);
2310 ieee80211_deliver_l2uf(ni);
2311 break;
2312 }
2313
2314 case IEEE80211_FC0_SUBTYPE_DEAUTH:
2315 case IEEE80211_FC0_SUBTYPE_DISASSOC: {
2316 #ifdef IEEE80211_DEBUG
2317 uint16_t reason;
2318 #endif
2319
2320 if (vap->iv_state != IEEE80211_S_RUN ||
2321 /* NB: can happen when in promiscuous mode */
2322 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
2323 vap->iv_stats.is_rx_mgtdiscard++;
2324 break;
2325 }
2326 /*
2327 * deauth/disassoc frame format
2328 * [2] reason
2329 */
2330 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
2331 #ifdef IEEE80211_DEBUG
2332 reason = le16toh(*(uint16_t *)frm);
2333 #endif
2334 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) {
2335 vap->iv_stats.is_rx_deauth++;
2336 IEEE80211_NODE_STAT(ni, rx_deauth);
2337 } else {
2338 vap->iv_stats.is_rx_disassoc++;
2339 IEEE80211_NODE_STAT(ni, rx_disassoc);
2340 }
2341 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2342 "recv %s (reason: %d (%s))",
2343 ieee80211_mgt_subtype_name(subtype),
2344 reason, ieee80211_reason_to_string(reason));
2345 if (ni != vap->iv_bss)
2346 ieee80211_node_leave(ni);
2347 break;
2348 }
2349
2350 case IEEE80211_FC0_SUBTYPE_ACTION:
2351 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
2352 if (ni == vap->iv_bss) {
2353 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2354 wh, NULL, "%s", "unknown node");
2355 vap->iv_stats.is_rx_mgtdiscard++;
2356 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
2357 !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
2358 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2359 wh, NULL, "%s", "not for us");
2360 vap->iv_stats.is_rx_mgtdiscard++;
2361 } else if (vap->iv_state != IEEE80211_S_RUN) {
2362 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2363 wh, NULL, "wrong state %s",
2364 ieee80211_state_name[vap->iv_state]);
2365 vap->iv_stats.is_rx_mgtdiscard++;
2366 } else {
2367 if (ieee80211_parse_action(ni, m0) == 0)
2368 (void)ic->ic_recv_action(ni, wh, frm, efrm);
2369 }
2370 break;
2371
2372 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2373 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2374 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
2375 case IEEE80211_FC0_SUBTYPE_ATIM:
2376 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2377 wh, NULL, "%s", "not handled");
2378 vap->iv_stats.is_rx_mgtdiscard++;
2379 break;
2380
2381 default:
2382 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2383 wh, "mgt", "subtype 0x%x not handled", subtype);
2384 vap->iv_stats.is_rx_badsubtype++;
2385 break;
2386 }
2387 }
2388
2389 static void
hostap_recv_ctl(struct ieee80211_node * ni,struct mbuf * m,int subtype)2390 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
2391 {
2392 switch (subtype) {
2393 case IEEE80211_FC0_SUBTYPE_PS_POLL:
2394 ni->ni_vap->iv_recv_pspoll(ni, m);
2395 break;
2396 case IEEE80211_FC0_SUBTYPE_BAR:
2397 ieee80211_recv_bar(ni, m);
2398 break;
2399 }
2400 }
2401
2402 /*
2403 * Process a received ps-poll frame.
2404 */
2405 void
ieee80211_recv_pspoll(struct ieee80211_node * ni,struct mbuf * m0)2406 ieee80211_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
2407 {
2408 struct ieee80211vap *vap = ni->ni_vap;
2409 struct ieee80211com *ic = vap->iv_ic;
2410 struct ieee80211_frame_min *wh;
2411 struct mbuf *m;
2412 uint16_t aid;
2413 int qlen;
2414
2415 wh = mtod(m0, struct ieee80211_frame_min *);
2416 if (ni->ni_associd == 0) {
2417 IEEE80211_DISCARD(vap,
2418 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2419 (struct ieee80211_frame *) wh, NULL,
2420 "%s", "unassociated station");
2421 vap->iv_stats.is_ps_unassoc++;
2422 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
2423 IEEE80211_REASON_NOT_ASSOCED);
2424 return;
2425 }
2426
2427 aid = le16toh(*(uint16_t *)wh->i_dur);
2428 if (aid != ni->ni_associd) {
2429 IEEE80211_DISCARD(vap,
2430 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2431 (struct ieee80211_frame *) wh, NULL,
2432 "aid mismatch: sta aid 0x%x poll aid 0x%x",
2433 ni->ni_associd, aid);
2434 vap->iv_stats.is_ps_badaid++;
2435 /*
2436 * NB: We used to deauth the station but it turns out
2437 * the Blackberry Curve 8230 (and perhaps other devices)
2438 * sometimes send the wrong AID when WME is negotiated.
2439 * Being more lenient here seems ok as we already check
2440 * the station is associated and we only return frames
2441 * queued for the station (i.e. we don't use the AID).
2442 */
2443 return;
2444 }
2445
2446 /* Okay, take the first queued packet and put it out... */
2447 m = ieee80211_node_psq_dequeue(ni, &qlen);
2448 if (m == NULL) {
2449 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2,
2450 "%s", "recv ps-poll, but queue empty");
2451 ieee80211_send_nulldata(ieee80211_ref_node(ni));
2452 vap->iv_stats.is_ps_qempty++; /* XXX node stat */
2453 if (vap->iv_set_tim != NULL)
2454 vap->iv_set_tim(ni, 0); /* just in case */
2455 return;
2456 }
2457 /*
2458 * If there are more packets, set the more packets bit
2459 * in the packet dispatched to the station; otherwise
2460 * turn off the TIM bit.
2461 */
2462 if (qlen != 0) {
2463 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2464 "recv ps-poll, send packet, %u still queued", qlen);
2465 m->m_flags |= M_MORE_DATA;
2466 } else {
2467 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2468 "%s", "recv ps-poll, send packet, queue empty");
2469 if (vap->iv_set_tim != NULL)
2470 vap->iv_set_tim(ni, 0);
2471 }
2472 m->m_flags |= M_PWR_SAV; /* bypass PS handling */
2473
2474 /*
2475 * Do the right thing; if it's an encap'ed frame then
2476 * call ieee80211_parent_xmitpkt() else
2477 * call ieee80211_vap_xmitpkt().
2478 */
2479 if (m->m_flags & M_ENCAP) {
2480 (void) ieee80211_parent_xmitpkt(ic, m);
2481 } else {
2482 (void) ieee80211_vap_xmitpkt(vap, m);
2483 }
2484 }
2485