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
40 #include <sys/socket.h>
41 #include <sys/sockio.h>
42 #include <sys/endian.h>
43 #include <sys/errno.h>
44 #include <sys/proc.h>
45 #include <sys/sysctl.h>
46
47 #include <net/if.h>
48 #include <net/if_var.h>
49 #include <net/if_media.h>
50 #include <net/if_llc.h>
51 #include <net/if_private.h>
52 #include <net/ethernet.h>
53
54 #include <net/bpf.h>
55
56 #include <net80211/ieee80211_var.h>
57 #include <net80211/ieee80211_hostap.h>
58 #include <net80211/ieee80211_input.h>
59 #ifdef IEEE80211_SUPPORT_SUPERG
60 #include <net80211/ieee80211_superg.h>
61 #endif
62 #include <net80211/ieee80211_wds.h>
63 #include <net80211/ieee80211_vht.h>
64 #include <net80211/ieee80211_sta.h> /* for parse_wmeie */
65
66 static void hostap_vattach(struct ieee80211vap *);
67 static int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int);
68 static int hostap_input(struct ieee80211_node *ni, struct mbuf *m,
69 const struct ieee80211_rx_stats *,
70 int rssi, int nf);
71 static void hostap_deliver_data(struct ieee80211vap *,
72 struct ieee80211_node *, struct mbuf *);
73 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *,
74 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf);
75 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int);
76
77 void
ieee80211_hostap_attach(struct ieee80211com * ic)78 ieee80211_hostap_attach(struct ieee80211com *ic)
79 {
80 ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach;
81 }
82
83 void
ieee80211_hostap_detach(struct ieee80211com * ic)84 ieee80211_hostap_detach(struct ieee80211com *ic)
85 {
86 }
87
88 static void
hostap_vdetach(struct ieee80211vap * vap)89 hostap_vdetach(struct ieee80211vap *vap)
90 {
91 }
92
93 static void
hostap_vattach(struct ieee80211vap * vap)94 hostap_vattach(struct ieee80211vap *vap)
95 {
96 vap->iv_newstate = hostap_newstate;
97 vap->iv_input = hostap_input;
98 vap->iv_recv_mgmt = hostap_recv_mgmt;
99 vap->iv_recv_ctl = hostap_recv_ctl;
100 vap->iv_opdetach = hostap_vdetach;
101 vap->iv_deliver_data = hostap_deliver_data;
102 vap->iv_recv_pspoll = ieee80211_recv_pspoll;
103 }
104
105 static void
sta_disassoc(void * arg,struct ieee80211_node * ni)106 sta_disassoc(void *arg, struct ieee80211_node *ni)
107 {
108
109 if (ni->ni_associd != 0) {
110 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC,
111 IEEE80211_REASON_ASSOC_LEAVE);
112 ieee80211_node_leave(ni);
113 }
114 }
115
116 static void
sta_csa(void * arg,struct ieee80211_node * ni)117 sta_csa(void *arg, struct ieee80211_node *ni)
118 {
119 struct ieee80211vap *vap = ni->ni_vap;
120
121 if (ni->ni_associd != 0)
122 if (ni->ni_inact > vap->iv_inact_init) {
123 ni->ni_inact = vap->iv_inact_init;
124 IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
125 "%s: inact %u", __func__, ni->ni_inact);
126 }
127 }
128
129 static void
sta_drop(void * arg,struct ieee80211_node * ni)130 sta_drop(void *arg, struct ieee80211_node *ni)
131 {
132
133 if (ni->ni_associd != 0)
134 ieee80211_node_leave(ni);
135 }
136
137 /*
138 * Does a channel change require associated stations to re-associate
139 * so protocol state is correct. This is used when doing CSA across
140 * bands or similar (e.g. HT -> legacy).
141 */
142 static int
isbandchange(struct ieee80211com * ic)143 isbandchange(struct ieee80211com *ic)
144 {
145 return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) &
146 (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF |
147 IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0;
148 }
149
150 /*
151 * IEEE80211_M_HOSTAP vap state machine handler.
152 */
153 static int
hostap_newstate(struct ieee80211vap * vap,enum ieee80211_state nstate,int arg)154 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
155 {
156 struct ieee80211com *ic = vap->iv_ic;
157 enum ieee80211_state ostate;
158
159 IEEE80211_LOCK_ASSERT(ic);
160
161 ostate = vap->iv_state;
162 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
163 __func__, ieee80211_state_name[ostate],
164 ieee80211_state_name[nstate], arg);
165 vap->iv_state = nstate; /* state transition */
166 if (ostate != IEEE80211_S_SCAN)
167 ieee80211_cancel_scan(vap); /* background scan */
168 switch (nstate) {
169 case IEEE80211_S_INIT:
170 switch (ostate) {
171 case IEEE80211_S_SCAN:
172 ieee80211_cancel_scan(vap);
173 break;
174 case IEEE80211_S_CAC:
175 ieee80211_dfs_cac_stop(vap);
176 break;
177 case IEEE80211_S_RUN:
178 ieee80211_iterate_nodes_vap(&ic->ic_sta, vap,
179 sta_disassoc, NULL);
180 break;
181 default:
182 break;
183 }
184 if (ostate != IEEE80211_S_INIT) {
185 /* NB: optimize INIT -> INIT case */
186 ieee80211_reset_bss(vap);
187 }
188 if (vap->iv_auth->ia_detach != NULL)
189 vap->iv_auth->ia_detach(vap);
190 break;
191 case IEEE80211_S_SCAN:
192 switch (ostate) {
193 case IEEE80211_S_CSA:
194 case IEEE80211_S_RUN:
195 ieee80211_iterate_nodes_vap(&ic->ic_sta, vap,
196 sta_disassoc, NULL);
197 /*
198 * Clear overlapping BSS state; the beacon frame
199 * will be reconstructed on transition to the RUN
200 * state and the timeout routines check if the flag
201 * is set before doing anything so this is sufficient.
202 */
203 vap->iv_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
204 vap->iv_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
205 /* XXX TODO: schedule deferred update? */
206 /* fall thru... */
207 case IEEE80211_S_CAC:
208 /*
209 * NB: We may get here because of a manual channel
210 * change in which case we need to stop CAC
211 * XXX no need to stop if ostate RUN but it's ok
212 */
213 ieee80211_dfs_cac_stop(vap);
214 /* fall thru... */
215 case IEEE80211_S_INIT:
216 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
217 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
218 /*
219 * Already have a channel; bypass the
220 * scan and startup immediately.
221 * ieee80211_create_ibss will call back to
222 * move us to RUN state.
223 */
224 ieee80211_create_ibss(vap, vap->iv_des_chan);
225 break;
226 }
227 /*
228 * Initiate a scan. We can come here as a result
229 * of an IEEE80211_IOC_SCAN_REQ too in which case
230 * the vap will be marked with IEEE80211_FEXT_SCANREQ
231 * and the scan request parameters will be present
232 * in iv_scanreq. Otherwise we do the default.
233 */
234 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
235 ieee80211_check_scan(vap,
236 vap->iv_scanreq_flags,
237 vap->iv_scanreq_duration,
238 vap->iv_scanreq_mindwell,
239 vap->iv_scanreq_maxdwell,
240 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
241 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
242 } else
243 ieee80211_check_scan_current(vap);
244 break;
245 case IEEE80211_S_SCAN:
246 /*
247 * A state change requires a reset; scan.
248 */
249 ieee80211_check_scan_current(vap);
250 break;
251 default:
252 break;
253 }
254 break;
255 case IEEE80211_S_CAC:
256 /*
257 * Start CAC on a DFS channel. We come here when starting
258 * a bss on a DFS channel (see ieee80211_create_ibss).
259 */
260 ieee80211_dfs_cac_start(vap);
261 break;
262 case IEEE80211_S_RUN:
263 if (vap->iv_flags & IEEE80211_F_WPA) {
264 /* XXX validate prerequisites */
265 }
266 switch (ostate) {
267 case IEEE80211_S_INIT:
268 /*
269 * Already have a channel; bypass the
270 * scan and startup immediately.
271 * Note that ieee80211_create_ibss will call
272 * back to do a RUN->RUN state change.
273 */
274 ieee80211_create_ibss(vap,
275 ieee80211_ht_adjust_channel(ic,
276 ic->ic_curchan, vap->iv_flags_ht));
277 /* NB: iv_bss is changed on return */
278 break;
279 case IEEE80211_S_CAC:
280 /*
281 * NB: This is the normal state change when CAC
282 * expires and no radar was detected; no need to
283 * clear the CAC timer as it's already expired.
284 */
285 /* fall thru... */
286 case IEEE80211_S_CSA:
287 /*
288 * Shorten inactivity timer of associated stations
289 * to weed out sta's that don't follow a CSA.
290 */
291 ieee80211_iterate_nodes_vap(&ic->ic_sta, vap,
292 sta_csa, NULL);
293 /*
294 * Update bss node channel to reflect where
295 * we landed after CSA.
296 */
297 ieee80211_node_set_chan(vap->iv_bss,
298 ieee80211_ht_adjust_channel(ic, ic->ic_curchan,
299 ieee80211_htchanflags(vap->iv_bss->ni_chan)));
300 /* XXX bypass debug msgs */
301 break;
302 case IEEE80211_S_SCAN:
303 case IEEE80211_S_RUN:
304 #ifdef IEEE80211_DEBUG
305 if (ieee80211_msg_debug(vap)) {
306 struct ieee80211_node *ni = vap->iv_bss;
307 ieee80211_note(vap,
308 "synchronized with %s ssid ",
309 ether_sprintf(ni->ni_bssid));
310 ieee80211_print_essid(ni->ni_essid,
311 ni->ni_esslen);
312 printf(" channel %d start %uMbit/s\n",
313 ieee80211_chan2ieee(ic, ic->ic_curchan),
314 ieee80211_node_get_txrate_kbit(ni) / 1000);
315 }
316 #endif
317 break;
318 default:
319 break;
320 }
321 /*
322 * Start/stop the authenticator. We delay until here
323 * to allow configuration to happen out of order.
324 */
325 if (vap->iv_auth->ia_attach != NULL) {
326 /* XXX check failure */
327 vap->iv_auth->ia_attach(vap);
328 } else if (vap->iv_auth->ia_detach != NULL) {
329 vap->iv_auth->ia_detach(vap);
330 }
331 ieee80211_node_authorize(vap->iv_bss);
332 break;
333 case IEEE80211_S_CSA:
334 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) {
335 /*
336 * On a ``band change'' silently drop associated
337 * stations as they must re-associate before they
338 * can pass traffic (as otherwise protocol state
339 * such as capabilities and the negotiated rate
340 * set may/will be wrong).
341 */
342 ieee80211_iterate_nodes_vap(&ic->ic_sta, vap,
343 sta_drop, NULL);
344 }
345 break;
346 default:
347 break;
348 }
349 return 0;
350 }
351
352 static void
hostap_deliver_data(struct ieee80211vap * vap,struct ieee80211_node * ni,struct mbuf * m)353 hostap_deliver_data(struct ieee80211vap *vap,
354 struct ieee80211_node *ni, struct mbuf *m)
355 {
356 struct ether_header *eh = mtod(m, struct ether_header *);
357 struct ifnet *ifp = vap->iv_ifp;
358
359 /* clear driver/net80211 flags before passing up */
360 m->m_flags &= ~(M_MCAST | M_BCAST);
361 m_clrprotoflags(m);
362
363 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP,
364 ("gack, opmode %d", vap->iv_opmode));
365 /*
366 * Do accounting.
367 */
368 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
369 IEEE80211_NODE_STAT(ni, rx_data);
370 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
371 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
372 m->m_flags |= M_MCAST; /* XXX M_BCAST? */
373 IEEE80211_NODE_STAT(ni, rx_mcast);
374 } else
375 IEEE80211_NODE_STAT(ni, rx_ucast);
376
377 /* perform as a bridge within the AP */
378 if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) {
379 struct mbuf *mcopy = NULL;
380
381 if (m->m_flags & M_MCAST) {
382 mcopy = m_dup(m, IEEE80211_M_NOWAIT);
383 if (mcopy == NULL)
384 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
385 else
386 mcopy->m_flags |= M_MCAST;
387 } else {
388 /*
389 * Check if the destination is associated with the
390 * same vap and authorized to receive traffic.
391 * Beware of traffic destined for the vap itself;
392 * sending it will not work; just let it be delivered
393 * normally.
394 */
395 struct ieee80211_node *sta = ieee80211_find_vap_node(
396 &vap->iv_ic->ic_sta, vap, eh->ether_dhost);
397 if (sta != NULL) {
398 if (ieee80211_node_is_authorized(sta)) {
399 /*
400 * Beware of sending to ourself; this
401 * needs to happen via the normal
402 * input path.
403 */
404 if (sta != vap->iv_bss) {
405 mcopy = m;
406 m = NULL;
407 }
408 } else {
409 vap->iv_stats.is_rx_unauth++;
410 IEEE80211_NODE_STAT(sta, rx_unauth);
411 }
412 ieee80211_free_node(sta);
413 }
414 }
415 if (mcopy != NULL)
416 (void) ieee80211_vap_xmitpkt(vap, mcopy);
417 }
418 if (m != NULL) {
419 struct epoch_tracker et;
420
421 /*
422 * Mark frame as coming from vap's interface.
423 */
424 m->m_pkthdr.rcvif = ifp;
425 if (m->m_flags & M_MCAST) {
426 /*
427 * Spam DWDS vap's w/ multicast traffic.
428 */
429 /* XXX only if dwds in use? */
430 ieee80211_dwds_mcast(vap, m);
431 }
432 if (ni->ni_vlan != 0) {
433 /* attach vlan tag */
434 m->m_pkthdr.ether_vtag = ni->ni_vlan;
435 m->m_flags |= M_VLANTAG;
436 }
437 NET_EPOCH_ENTER(et);
438 ifp->if_input(ifp, m);
439 NET_EPOCH_EXIT(et);
440 }
441 }
442
443 /*
444 * Decide if a received management frame should be
445 * printed when debugging is enabled. This filters some
446 * of the less interesting frames that come frequently
447 * (e.g. beacons).
448 */
449 static __inline int
doprint(struct ieee80211vap * vap,int subtype)450 doprint(struct ieee80211vap *vap, int subtype)
451 {
452 switch (subtype) {
453 case IEEE80211_FC0_SUBTYPE_BEACON:
454 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
455 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
456 return 0;
457 }
458 return 1;
459 }
460
461 /*
462 * Process a received frame. The node associated with the sender
463 * should be supplied. If nothing was found in the node table then
464 * the caller is assumed to supply a reference to iv_bss instead.
465 * The RSSI and a timestamp are also supplied. The RSSI data is used
466 * during AP scanning to select a AP to associate with; it can have
467 * any units so long as values have consistent units and higher values
468 * mean ``better signal''. The receive timestamp is currently not used
469 * by the 802.11 layer.
470 */
471 static int
hostap_input(struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_rx_stats * rxs,int rssi,int nf)472 hostap_input(struct ieee80211_node *ni, struct mbuf *m,
473 const struct ieee80211_rx_stats *rxs, int rssi, int nf)
474 {
475 struct ieee80211vap *vap = ni->ni_vap;
476 struct ieee80211com *ic = ni->ni_ic;
477 struct ifnet *ifp = vap->iv_ifp;
478 struct ieee80211_frame *wh;
479 struct ieee80211_key *key;
480 struct ether_header *eh;
481 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
482 uint8_t dir, type, subtype, qos;
483 uint8_t *bssid;
484 int is_hw_decrypted = 0;
485 int has_decrypted = 0;
486
487 /*
488 * Some devices do hardware decryption all the way through
489 * to pretending the frame wasn't encrypted in the first place.
490 * So, tag it appropriately so it isn't discarded inappropriately.
491 */
492 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED))
493 is_hw_decrypted = 1;
494
495 if (m->m_flags & M_AMPDU_MPDU) {
496 /*
497 * Fastpath for A-MPDU reorder q resubmission. Frames
498 * w/ M_AMPDU_MPDU marked have already passed through
499 * here but were received out of order and been held on
500 * the reorder queue. When resubmitted they are marked
501 * with the M_AMPDU_MPDU flag and we can bypass most of
502 * the normal processing.
503 */
504 wh = mtod(m, struct ieee80211_frame *);
505 type = IEEE80211_FC0_TYPE_DATA;
506 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
507 subtype = IEEE80211_FC0_SUBTYPE_QOS_DATA;
508 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
509 goto resubmit_ampdu;
510 }
511
512 KASSERT(ni != NULL, ("null node"));
513 ni->ni_inact = ni->ni_inact_reload;
514
515 type = -1; /* undefined */
516
517 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
518 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
519 ni->ni_macaddr, NULL,
520 "too short (1): len %u", m->m_pkthdr.len);
521 vap->iv_stats.is_rx_tooshort++;
522 goto out;
523 }
524 /*
525 * Bit of a cheat here, we use a pointer for a 3-address
526 * frame format but don't reference fields past outside
527 * ieee80211_frame_min w/o first validating the data is
528 * present.
529 */
530 wh = mtod(m, struct ieee80211_frame *);
531
532 if (!IEEE80211_IS_FC0_CHECK_VER(wh, IEEE80211_FC0_VERSION_0)) {
533 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
534 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
535 wh->i_fc[0], wh->i_fc[1]);
536 vap->iv_stats.is_rx_badversion++;
537 goto err;
538 }
539
540 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
541 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
542 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
543 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
544 if (dir != IEEE80211_FC1_DIR_NODS)
545 bssid = wh->i_addr1;
546 else if (type == IEEE80211_FC0_TYPE_CTL)
547 bssid = wh->i_addr1;
548 else {
549 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
550 IEEE80211_DISCARD_MAC(vap,
551 IEEE80211_MSG_ANY, ni->ni_macaddr,
552 NULL, "too short (2): len %u",
553 m->m_pkthdr.len);
554 vap->iv_stats.is_rx_tooshort++;
555 goto out;
556 }
557 bssid = wh->i_addr3;
558 }
559 /*
560 * Validate the bssid.
561 */
562 if (!(type == IEEE80211_FC0_TYPE_MGT &&
563 subtype == IEEE80211_FC0_SUBTYPE_BEACON) &&
564 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
565 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
566 /* not interested in */
567 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
568 bssid, NULL, "%s", "not to bss");
569 vap->iv_stats.is_rx_wrongbss++;
570 goto out;
571 }
572
573 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
574 ni->ni_noise = nf;
575 if (IEEE80211_HAS_SEQ(type, subtype)) {
576 uint8_t tid = ieee80211_gettid(wh);
577 if (IEEE80211_QOS_HAS_SEQ(wh) &&
578 TID_TO_WME_AC(tid) >= WME_AC_VI)
579 ic->ic_wme.wme_hipri_traffic++;
580 if (! ieee80211_check_rxseq(ni, wh, bssid, rxs))
581 goto out;
582 }
583 }
584
585 switch (type) {
586 case IEEE80211_FC0_TYPE_DATA:
587 hdrspace = ieee80211_hdrspace(ic, wh);
588 if (m->m_len < hdrspace &&
589 (m = m_pullup(m, hdrspace)) == NULL) {
590 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
591 ni->ni_macaddr, NULL,
592 "data too short: expecting %u", hdrspace);
593 vap->iv_stats.is_rx_tooshort++;
594 goto out; /* XXX */
595 }
596 if (!(dir == IEEE80211_FC1_DIR_TODS ||
597 (dir == IEEE80211_FC1_DIR_DSTODS &&
598 (vap->iv_flags & IEEE80211_F_DWDS)))) {
599 if (dir != IEEE80211_FC1_DIR_DSTODS) {
600 IEEE80211_DISCARD(vap,
601 IEEE80211_MSG_INPUT, wh, "data",
602 "incorrect dir 0x%x", dir);
603 } else {
604 IEEE80211_DISCARD(vap,
605 IEEE80211_MSG_INPUT |
606 IEEE80211_MSG_WDS, wh,
607 "4-address data",
608 "%s", "DWDS not enabled");
609 }
610 vap->iv_stats.is_rx_wrongdir++;
611 goto out;
612 }
613 /* check if source STA is associated */
614 if (ni == vap->iv_bss) {
615 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
616 wh, "data", "%s", "unknown src");
617 ieee80211_send_error(ni, wh->i_addr2,
618 IEEE80211_FC0_SUBTYPE_DEAUTH,
619 IEEE80211_REASON_NOT_AUTHED);
620 vap->iv_stats.is_rx_notassoc++;
621 goto err;
622 }
623 if (ni->ni_associd == 0) {
624 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
625 wh, "data", "%s", "unassoc src");
626 IEEE80211_SEND_MGMT(ni,
627 IEEE80211_FC0_SUBTYPE_DISASSOC,
628 IEEE80211_REASON_NOT_ASSOCED);
629 vap->iv_stats.is_rx_notassoc++;
630 goto err;
631 }
632
633 /*
634 * Check for power save state change.
635 * XXX out-of-order A-MPDU frames?
636 */
637 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^
638 (ni->ni_flags & IEEE80211_NODE_PWR_MGT)))
639 vap->iv_node_ps(ni,
640 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT);
641 /*
642 * For 4-address packets handle WDS discovery
643 * notifications. Once a WDS link is setup frames
644 * are just delivered to the WDS vap (see below).
645 */
646 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) {
647 if (!ieee80211_node_is_authorized(ni)) {
648 IEEE80211_DISCARD(vap,
649 IEEE80211_MSG_INPUT |
650 IEEE80211_MSG_WDS, wh,
651 "4-address data",
652 "%s", "unauthorized port");
653 vap->iv_stats.is_rx_unauth++;
654 IEEE80211_NODE_STAT(ni, rx_unauth);
655 goto err;
656 }
657 ieee80211_dwds_discover(ni, m);
658 return type;
659 }
660
661 /*
662 * Handle A-MPDU re-ordering. If the frame is to be
663 * processed directly then ieee80211_ampdu_reorder
664 * will return 0; otherwise it has consumed the mbuf
665 * and we should do nothing more with it.
666 */
667 if ((m->m_flags & M_AMPDU) &&
668 ieee80211_ampdu_reorder(ni, m, rxs) != 0) {
669 m = NULL;
670 goto out;
671 }
672 resubmit_ampdu:
673
674 /*
675 * Handle privacy requirements. Note that we
676 * must not be preempted from here until after
677 * we (potentially) call ieee80211_crypto_demic;
678 * otherwise we may violate assumptions in the
679 * crypto cipher modules used to do delayed update
680 * of replay sequence numbers.
681 */
682 if (is_hw_decrypted || IEEE80211_IS_PROTECTED(wh)) {
683 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
684 /*
685 * Discard encrypted frames when privacy is off.
686 */
687 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
688 wh, "WEP", "%s", "PRIVACY off");
689 vap->iv_stats.is_rx_noprivacy++;
690 IEEE80211_NODE_STAT(ni, rx_noprivacy);
691 goto out;
692 }
693 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
694 /* NB: stats+msgs handled in crypto_decap */
695 IEEE80211_NODE_STAT(ni, rx_wepfail);
696 goto out;
697 }
698 wh = mtod(m, struct ieee80211_frame *);
699 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
700 has_decrypted = 1;
701 } else {
702 /* XXX M_WEP and IEEE80211_F_PRIVACY */
703 key = NULL;
704 }
705
706 /*
707 * Save QoS bits for use below--before we strip the header.
708 */
709 if (subtype == IEEE80211_FC0_SUBTYPE_QOS_DATA)
710 qos = ieee80211_getqos(wh)[0];
711 else
712 qos = 0;
713
714 /*
715 * Next up, any fragmentation.
716 */
717 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
718 m = ieee80211_defrag(ni, m, hdrspace, has_decrypted);
719 if (m == NULL) {
720 /* Fragment dropped or frame not complete yet */
721 goto out;
722 }
723 }
724 wh = NULL; /* no longer valid, catch any uses */
725
726 /*
727 * Next strip any MSDU crypto bits.
728 */
729 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
730 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
731 ni->ni_macaddr, "data", "%s", "demic error");
732 vap->iv_stats.is_rx_demicfail++;
733 IEEE80211_NODE_STAT(ni, rx_demicfail);
734 goto out;
735 }
736 /* copy to listener after decrypt */
737 if (ieee80211_radiotap_active_vap(vap))
738 ieee80211_radiotap_rx(vap, m);
739 need_tap = 0;
740 /*
741 * Finally, strip the 802.11 header.
742 */
743 m = ieee80211_decap(vap, m, hdrspace, qos);
744 if (m == NULL) {
745 /* XXX mask bit to check for both */
746 /* don't count Null data frames as errors */
747 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
748 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
749 goto out;
750 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
751 ni->ni_macaddr, "data", "%s", "decap error");
752 vap->iv_stats.is_rx_decap++;
753 IEEE80211_NODE_STAT(ni, rx_decap);
754 goto err;
755 }
756 if (!(qos & IEEE80211_QOS_AMSDU))
757 eh = mtod(m, struct ether_header *);
758 else
759 eh = NULL;
760 if (!ieee80211_node_is_authorized(ni)) {
761 /*
762 * Deny any non-PAE frames received prior to
763 * authorization. For open/shared-key
764 * authentication the port is mark authorized
765 * after authentication completes. For 802.1x
766 * the port is not marked authorized by the
767 * authenticator until the handshake has completed.
768 */
769 if (eh == NULL ||
770 eh->ether_type != htons(ETHERTYPE_PAE)) {
771 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
772 ni->ni_macaddr, "data", "unauthorized or "
773 "unknown port: ether type 0x%x len %u",
774 eh == NULL ? -1 : eh->ether_type,
775 m->m_pkthdr.len);
776 vap->iv_stats.is_rx_unauth++;
777 IEEE80211_NODE_STAT(ni, rx_unauth);
778 goto err;
779 }
780 } else {
781 /*
782 * When denying unencrypted frames, discard
783 * any non-PAE frames received without encryption.
784 */
785 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
786 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
787 (is_hw_decrypted == 0) &&
788 (eh == NULL ||
789 eh->ether_type != htons(ETHERTYPE_PAE))) {
790 /*
791 * Drop unencrypted frames.
792 */
793 vap->iv_stats.is_rx_unencrypted++;
794 IEEE80211_NODE_STAT(ni, rx_unencrypted);
795 goto out;
796 }
797 }
798 /* XXX require HT? */
799 if (qos & IEEE80211_QOS_AMSDU) {
800 m = ieee80211_decap_amsdu(ni, m);
801 if (m == NULL)
802 return IEEE80211_FC0_TYPE_DATA;
803 } else {
804 #ifdef IEEE80211_SUPPORT_SUPERG
805 m = ieee80211_decap_fastframe(vap, ni, m);
806 if (m == NULL)
807 return IEEE80211_FC0_TYPE_DATA;
808 #endif
809 }
810 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
811 ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
812 else
813 hostap_deliver_data(vap, ni, m);
814 return IEEE80211_FC0_TYPE_DATA;
815
816 case IEEE80211_FC0_TYPE_MGT:
817 vap->iv_stats.is_rx_mgmt++;
818 IEEE80211_NODE_STAT(ni, rx_mgmt);
819 if (dir != IEEE80211_FC1_DIR_NODS) {
820 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
821 wh, "mgt", "incorrect dir 0x%x", dir);
822 vap->iv_stats.is_rx_wrongdir++;
823 goto err;
824 }
825 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
826 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
827 ni->ni_macaddr, "mgt", "too short: len %u",
828 m->m_pkthdr.len);
829 vap->iv_stats.is_rx_tooshort++;
830 goto out;
831 }
832 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
833 /* ensure return frames are unicast */
834 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
835 wh, NULL, "source is multicast: %s",
836 ether_sprintf(wh->i_addr2));
837 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */
838 goto out;
839 }
840 #ifdef IEEE80211_DEBUG
841 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
842 ieee80211_msg_dumppkts(vap)) {
843 if_printf(ifp, "received %s from %s rssi %d\n",
844 ieee80211_mgt_subtype_name(subtype),
845 ether_sprintf(wh->i_addr2), rssi);
846 }
847 #endif
848 if (IEEE80211_IS_PROTECTED(wh)) {
849 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
850 /*
851 * Only shared key auth frames with a challenge
852 * should be encrypted, discard all others.
853 */
854 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
855 wh, NULL,
856 "%s", "WEP set but not permitted");
857 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
858 goto out;
859 }
860 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
861 /*
862 * Discard encrypted frames when privacy is off.
863 */
864 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
865 wh, NULL, "%s", "WEP set but PRIVACY off");
866 vap->iv_stats.is_rx_noprivacy++;
867 goto out;
868 }
869 hdrspace = ieee80211_hdrspace(ic, wh);
870 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
871 /* NB: stats+msgs handled in crypto_decap */
872 goto out;
873 }
874 wh = mtod(m, struct ieee80211_frame *);
875 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
876 has_decrypted = 1;
877 }
878 /*
879 * Pass the packet to radiotap before calling iv_recv_mgmt().
880 * Otherwise iv_recv_mgmt() might pass another packet to
881 * radiotap, resulting in out of order packet captures.
882 */
883 if (ieee80211_radiotap_active_vap(vap))
884 ieee80211_radiotap_rx(vap, m);
885 need_tap = 0;
886 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
887 goto out;
888
889 case IEEE80211_FC0_TYPE_CTL:
890 vap->iv_stats.is_rx_ctl++;
891 IEEE80211_NODE_STAT(ni, rx_ctrl);
892 vap->iv_recv_ctl(ni, m, subtype);
893 goto out;
894 default:
895 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
896 wh, "bad", "frame type 0x%x", type);
897 /* should not come here */
898 break;
899 }
900 err:
901 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
902 out:
903 if (m != NULL) {
904 if (need_tap && ieee80211_radiotap_active_vap(vap))
905 ieee80211_radiotap_rx(vap, m);
906 m_freem(m);
907 }
908 return type;
909 }
910
911 static void
hostap_auth_open(struct ieee80211_node * ni,struct ieee80211_frame * wh,int rssi,int nf,uint16_t seq,uint16_t status)912 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
913 int rssi, int nf, uint16_t seq, uint16_t status)
914 {
915 struct ieee80211vap *vap = ni->ni_vap;
916
917 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
918
919 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
920 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
921 ni->ni_macaddr, "open auth",
922 "bad sta auth mode %u", ni->ni_authmode);
923 vap->iv_stats.is_rx_bad_auth++; /* XXX */
924 /*
925 * Clear any challenge text that may be there if
926 * a previous shared key auth failed and then an
927 * open auth is attempted.
928 */
929 if (ni->ni_challenge != NULL) {
930 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
931 ni->ni_challenge = NULL;
932 }
933 /* XXX hack to workaround calling convention */
934 ieee80211_send_error(ni, wh->i_addr2,
935 IEEE80211_FC0_SUBTYPE_AUTH,
936 (seq + 1) | (IEEE80211_STATUS_ALG<<16));
937 return;
938 }
939 if (seq != IEEE80211_AUTH_OPEN_REQUEST) {
940 vap->iv_stats.is_rx_bad_auth++;
941 return;
942 }
943 /* always accept open authentication requests */
944 if (ni == vap->iv_bss) {
945 ni = ieee80211_dup_bss(vap, wh->i_addr2);
946 if (ni == NULL)
947 return;
948 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
949 (void) ieee80211_ref_node(ni);
950 /*
951 * Mark the node as referenced to reflect that it's
952 * reference count has been bumped to insure it remains
953 * after the transaction completes.
954 */
955 ni->ni_flags |= IEEE80211_NODE_AREF;
956 /*
957 * Mark the node as requiring a valid association id
958 * before outbound traffic is permitted.
959 */
960 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
961
962 if (vap->iv_acl != NULL &&
963 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
964 /*
965 * When the ACL policy is set to RADIUS we defer the
966 * authorization to a user agent. Dispatch an event,
967 * a subsequent MLME call will decide the fate of the
968 * station. If the user agent is not present then the
969 * node will be reclaimed due to inactivity.
970 */
971 IEEE80211_NOTE_MAC(vap,
972 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr,
973 "%s", "station authentication deferred (radius acl)");
974 ieee80211_notify_node_auth(ni);
975 } else {
976 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
977 IEEE80211_NOTE_MAC(vap,
978 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr,
979 "%s", "station authenticated (open)");
980 /*
981 * When 802.1x is not in use mark the port
982 * authorized at this point so traffic can flow.
983 */
984 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
985 ieee80211_node_authorize(ni);
986 }
987 }
988
989 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)990 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
991 uint8_t *frm, uint8_t *efrm, int rssi, int nf,
992 uint16_t seq, uint16_t status)
993 {
994 struct ieee80211vap *vap = ni->ni_vap;
995 uint8_t *challenge;
996 int estatus;
997
998 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
999
1000 /*
1001 * NB: this can happen as we allow pre-shared key
1002 * authentication to be enabled w/o wep being turned
1003 * on so that configuration of these can be done
1004 * in any order. It may be better to enforce the
1005 * ordering in which case this check would just be
1006 * for sanity/consistency.
1007 */
1008 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1009 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1010 ni->ni_macaddr, "shared key auth",
1011 "%s", " PRIVACY is disabled");
1012 estatus = IEEE80211_STATUS_ALG;
1013 goto bad;
1014 }
1015 /*
1016 * Pre-shared key authentication is evil; accept
1017 * it only if explicitly configured (it is supported
1018 * mainly for compatibility with clients like Mac OS X).
1019 */
1020 if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1021 ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1022 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1023 ni->ni_macaddr, "shared key auth",
1024 "bad sta auth mode %u", ni->ni_authmode);
1025 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1026 estatus = IEEE80211_STATUS_ALG;
1027 goto bad;
1028 }
1029
1030 challenge = NULL;
1031 if (frm + 1 < efrm) {
1032 if ((frm[1] + 2) > (efrm - frm)) {
1033 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1034 ni->ni_macaddr, "shared key auth",
1035 "ie %d/%d too long",
1036 frm[0], (frm[1] + 2) - (efrm - frm));
1037 vap->iv_stats.is_rx_bad_auth++;
1038 estatus = IEEE80211_STATUS_CHALLENGE;
1039 goto bad;
1040 }
1041 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1042 challenge = frm;
1043 frm += frm[1] + 2;
1044 }
1045 switch (seq) {
1046 case IEEE80211_AUTH_SHARED_CHALLENGE:
1047 case IEEE80211_AUTH_SHARED_RESPONSE:
1048 if (challenge == NULL) {
1049 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1050 ni->ni_macaddr, "shared key auth",
1051 "%s", "no challenge");
1052 vap->iv_stats.is_rx_bad_auth++;
1053 estatus = IEEE80211_STATUS_CHALLENGE;
1054 goto bad;
1055 }
1056 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1057 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1058 ni->ni_macaddr, "shared key auth",
1059 "bad challenge len %d", challenge[1]);
1060 vap->iv_stats.is_rx_bad_auth++;
1061 estatus = IEEE80211_STATUS_CHALLENGE;
1062 goto bad;
1063 }
1064 default:
1065 break;
1066 }
1067 switch (seq) {
1068 case IEEE80211_AUTH_SHARED_REQUEST:
1069 {
1070 #ifdef IEEE80211_DEBUG
1071 bool allocbs;
1072 #endif
1073
1074 if (ni == vap->iv_bss) {
1075 ni = ieee80211_dup_bss(vap, wh->i_addr2);
1076 if (ni == NULL) {
1077 /* NB: no way to return an error */
1078 return;
1079 }
1080 #ifdef IEEE80211_DEBUG
1081 allocbs = 1;
1082 #endif
1083 } else {
1084 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
1085 (void) ieee80211_ref_node(ni);
1086 #ifdef IEEE80211_DEBUG
1087 allocbs = 0;
1088 #endif
1089 }
1090 /*
1091 * Mark the node as referenced to reflect that it's
1092 * reference count has been bumped to insure it remains
1093 * after the transaction completes.
1094 */
1095 ni->ni_flags |= IEEE80211_NODE_AREF;
1096 /*
1097 * Mark the node as requiring a valid association id
1098 * before outbound traffic is permitted.
1099 */
1100 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
1101 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
1102 ni->ni_noise = nf;
1103 if (!ieee80211_alloc_challenge(ni)) {
1104 /* NB: don't return error so they rexmit */
1105 return;
1106 }
1107 net80211_get_random_bytes(ni->ni_challenge,
1108 IEEE80211_CHALLENGE_LEN);
1109 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1110 ni, "shared key %sauth request", allocbs ? "" : "re");
1111 /*
1112 * When the ACL policy is set to RADIUS we defer the
1113 * authorization to a user agent. Dispatch an event,
1114 * a subsequent MLME call will decide the fate of the
1115 * station. If the user agent is not present then the
1116 * node will be reclaimed due to inactivity.
1117 */
1118 if (vap->iv_acl != NULL &&
1119 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
1120 IEEE80211_NOTE_MAC(vap,
1121 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL,
1122 ni->ni_macaddr,
1123 "%s", "station authentication deferred (radius acl)");
1124 ieee80211_notify_node_auth(ni);
1125 return;
1126 }
1127 break;
1128 }
1129 case IEEE80211_AUTH_SHARED_RESPONSE:
1130 if (ni == vap->iv_bss) {
1131 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1132 ni->ni_macaddr, "shared key response",
1133 "%s", "unknown station");
1134 /* NB: don't send a response */
1135 return;
1136 }
1137 if (ni->ni_challenge == NULL) {
1138 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1139 ni->ni_macaddr, "shared key response",
1140 "%s", "no challenge recorded");
1141 vap->iv_stats.is_rx_bad_auth++;
1142 estatus = IEEE80211_STATUS_CHALLENGE;
1143 goto bad;
1144 }
1145 if (memcmp(ni->ni_challenge, &challenge[2],
1146 challenge[1]) != 0) {
1147 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1148 ni->ni_macaddr, "shared key response",
1149 "%s", "challenge mismatch");
1150 vap->iv_stats.is_rx_auth_fail++;
1151 estatus = IEEE80211_STATUS_CHALLENGE;
1152 goto bad;
1153 }
1154 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1155 ni, "%s", "station authenticated (shared key)");
1156 ieee80211_node_authorize(ni);
1157 break;
1158 default:
1159 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1160 ni->ni_macaddr, "shared key auth",
1161 "bad seq %d", seq);
1162 vap->iv_stats.is_rx_bad_auth++;
1163 estatus = IEEE80211_STATUS_SEQUENCE;
1164 goto bad;
1165 }
1166 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1167 return;
1168 bad:
1169 /*
1170 * Send an error response; but only when operating as an AP.
1171 */
1172 /* XXX hack to workaround calling convention */
1173 ieee80211_send_error(ni, wh->i_addr2,
1174 IEEE80211_FC0_SUBTYPE_AUTH,
1175 (seq + 1) | (estatus<<16));
1176 }
1177
1178 /*
1179 * Convert a WPA cipher selector OUI to an internal
1180 * cipher algorithm. Where appropriate we also
1181 * record any key length.
1182 */
1183 static int
wpa_cipher(const uint8_t * sel,uint8_t * keylen,uint8_t * cipher)1184 wpa_cipher(const uint8_t *sel, uint8_t *keylen, uint8_t *cipher)
1185 {
1186 #define WPA_SEL(x) (((x)<<24)|WPA_OUI)
1187 uint32_t w = le32dec(sel);
1188
1189 switch (w) {
1190 case WPA_SEL(WPA_CSE_NULL):
1191 *cipher = IEEE80211_CIPHER_NONE;
1192 break;
1193 case WPA_SEL(WPA_CSE_WEP40):
1194 if (keylen)
1195 *keylen = 40 / NBBY;
1196 *cipher = IEEE80211_CIPHER_WEP;
1197 break;
1198 case WPA_SEL(WPA_CSE_WEP104):
1199 if (keylen)
1200 *keylen = 104 / NBBY;
1201 *cipher = IEEE80211_CIPHER_WEP;
1202 break;
1203 case WPA_SEL(WPA_CSE_TKIP):
1204 *cipher = IEEE80211_CIPHER_TKIP;
1205 break;
1206 case WPA_SEL(WPA_CSE_CCMP):
1207 *cipher = IEEE80211_CIPHER_AES_CCM;
1208 break;
1209 /* Note: no GCM cipher in the legacy WPA1 OUI */
1210 default:
1211 return (EINVAL);
1212 }
1213
1214 return (0);
1215 #undef WPA_SEL
1216 }
1217
1218 /*
1219 * Convert a WPA key management/authentication algorithm
1220 * to an internal code.
1221 */
1222 static int
wpa_keymgmt(const uint8_t * sel)1223 wpa_keymgmt(const uint8_t *sel)
1224 {
1225 #define WPA_SEL(x) (((x)<<24)|WPA_OUI)
1226 uint32_t w = le32dec(sel);
1227
1228 switch (w) {
1229 case WPA_SEL(WPA_ASE_8021X_UNSPEC):
1230 return WPA_ASE_8021X_UNSPEC;
1231 case WPA_SEL(WPA_ASE_8021X_PSK):
1232 return WPA_ASE_8021X_PSK;
1233 case WPA_SEL(WPA_ASE_NONE):
1234 return WPA_ASE_NONE;
1235 }
1236 return 0; /* NB: so is discarded */
1237 #undef WPA_SEL
1238 }
1239
1240 /*
1241 * Parse a WPA information element to collect parameters.
1242 * Note that we do not validate security parameters; that
1243 * is handled by the authenticator; the parsing done here
1244 * is just for internal use in making operational decisions.
1245 */
1246 static int
ieee80211_parse_wpa(struct ieee80211vap * vap,const uint8_t * frm,struct ieee80211_rsnparms * rsn,const struct ieee80211_frame * wh)1247 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm,
1248 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1249 {
1250 uint8_t len = frm[1];
1251 uint32_t w;
1252 int error, n;
1253
1254 /*
1255 * Check the length once for fixed parts: OUI, type,
1256 * version, mcast cipher, and 2 selector counts.
1257 * Other, variable-length data, must be checked separately.
1258 */
1259 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) {
1260 IEEE80211_DISCARD_IE(vap,
1261 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1262 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags);
1263 return IEEE80211_REASON_IE_INVALID;
1264 }
1265 if (len < 14) {
1266 IEEE80211_DISCARD_IE(vap,
1267 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1268 wh, "WPA", "too short, len %u", len);
1269 return IEEE80211_REASON_IE_INVALID;
1270 }
1271 frm += 6, len -= 4; /* NB: len is payload only */
1272 /* NB: iswpaoui already validated the OUI and type */
1273 w = le16dec(frm);
1274 if (w != WPA_VERSION) {
1275 IEEE80211_DISCARD_IE(vap,
1276 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1277 wh, "WPA", "bad version %u", w);
1278 return IEEE80211_REASON_IE_INVALID;
1279 }
1280 frm += 2, len -= 2;
1281
1282 memset(rsn, 0, sizeof(*rsn));
1283
1284 /* multicast/group cipher */
1285 error = wpa_cipher(frm, &rsn->rsn_mcastkeylen, &rsn->rsn_mcastcipher);
1286 if (error != 0) {
1287 IEEE80211_DISCARD_IE(vap,
1288 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1289 wh, "WPA", "unknown mcast cipher suite %08X",
1290 le32dec(frm));
1291 return IEEE80211_REASON_GROUP_CIPHER_INVALID;
1292 }
1293 frm += 4, len -= 4;
1294
1295 /* unicast ciphers */
1296 n = le16dec(frm);
1297 frm += 2, len -= 2;
1298 if (len < n*4+2) {
1299 IEEE80211_DISCARD_IE(vap,
1300 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1301 wh, "WPA", "ucast cipher data too short; len %u, n %u",
1302 len, n);
1303 return IEEE80211_REASON_IE_INVALID;
1304 }
1305 w = 0;
1306 for (; n > 0; n--) {
1307 uint8_t cipher;
1308
1309 error = wpa_cipher(frm, &rsn->rsn_ucastkeylen, &cipher);
1310 if (error == 0)
1311 w |= 1 << cipher;
1312
1313 frm += 4, len -= 4;
1314 }
1315 if (w == 0) {
1316 IEEE80211_DISCARD_IE(vap,
1317 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1318 wh, "WPA", "no usable pairwise cipher suite found (w=%d)",
1319 w);
1320 return IEEE80211_REASON_PAIRWISE_CIPHER_INVALID;
1321 }
1322 /* XXX other? */
1323 if (w & (1 << IEEE80211_CIPHER_AES_CCM))
1324 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1325 else
1326 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1327
1328 /* key management algorithms */
1329 n = le16dec(frm);
1330 frm += 2, len -= 2;
1331 if (len < n*4) {
1332 IEEE80211_DISCARD_IE(vap,
1333 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1334 wh, "WPA", "key mgmt alg data too short; len %u, n %u",
1335 len, n);
1336 return IEEE80211_REASON_IE_INVALID;
1337 }
1338 w = 0;
1339 for (; n > 0; n--) {
1340 w |= wpa_keymgmt(frm);
1341 frm += 4, len -= 4;
1342 }
1343 if (w & WPA_ASE_8021X_UNSPEC)
1344 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC;
1345 else
1346 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
1347
1348 if (len > 2) /* optional capabilities */
1349 rsn->rsn_caps = le16dec(frm);
1350
1351 return 0;
1352 }
1353
1354 /*
1355 * Convert an RSN cipher selector OUI to an internal
1356 * cipher algorithm. Where appropriate we also
1357 * record any key length.
1358 */
1359 static int
rsn_cipher(const uint8_t * sel,uint8_t * keylen,uint8_t * cipher)1360 rsn_cipher(const uint8_t *sel, uint8_t *keylen, uint8_t *cipher)
1361 {
1362 #define RSN_SEL(x) (((x)<<24)|RSN_OUI)
1363 uint32_t w = le32dec(sel);
1364
1365 switch (w) {
1366 case RSN_SEL(RSN_CSE_NULL):
1367 *cipher = IEEE80211_CIPHER_NONE;
1368 break;
1369 case RSN_SEL(RSN_CSE_WEP40):
1370 if (keylen)
1371 *keylen = 40 / NBBY;
1372 *cipher = IEEE80211_CIPHER_WEP;
1373 break;
1374 case RSN_SEL(RSN_CSE_WEP104):
1375 if (keylen)
1376 *keylen = 104 / NBBY;
1377 *cipher = IEEE80211_CIPHER_WEP;
1378 break;
1379 case RSN_SEL(RSN_CSE_TKIP):
1380 *cipher = IEEE80211_CIPHER_TKIP;
1381 break;
1382 case RSN_SEL(RSN_CSE_CCMP):
1383 *cipher = IEEE80211_CIPHER_AES_CCM;
1384 break;
1385 case RSN_SEL(RSN_CSE_WRAP):
1386 *cipher = IEEE80211_CIPHER_AES_OCB;
1387 break;
1388 case RSN_SEL(RSN_CSE_GCMP_128):
1389 *cipher = IEEE80211_CIPHER_AES_GCM_128;
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_GCM_128))
1504 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_GCM_128;
1505 else if (w & (1 << IEEE80211_CIPHER_AES_CCM))
1506 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1507 else if (w & (1 << IEEE80211_CIPHER_AES_OCB))
1508 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_OCB;
1509 else if (w & (1 << IEEE80211_CIPHER_TKIP))
1510 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1511 else if ((w & (1 << IEEE80211_CIPHER_NONE)) &&
1512 (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP ||
1513 rsn->rsn_mcastcipher == IEEE80211_CIPHER_TKIP))
1514 rsn->rsn_ucastcipher = IEEE80211_CIPHER_NONE;
1515 else {
1516 IEEE80211_DISCARD_IE(vap,
1517 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1518 wh, "RSN", "no usable pairwise cipher suite found (w=%d)",
1519 w);
1520 return IEEE80211_REASON_PAIRWISE_CIPHER_INVALID;
1521 }
1522
1523 /* key management algorithms */
1524 n = le16dec(frm);
1525 frm += 2, len -= 2;
1526 if (len < n*4) {
1527 IEEE80211_DISCARD_IE(vap,
1528 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1529 wh, "RSN", "key mgmt alg data too short; len %u, n %u",
1530 len, n);
1531 return IEEE80211_REASON_IE_INVALID;
1532 }
1533 w = 0;
1534 for (; n > 0; n--) {
1535 w |= rsn_keymgmt(frm);
1536 frm += 4, len -= 4;
1537 }
1538 if (w & RSN_ASE_8021X_UNSPEC)
1539 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC;
1540 else
1541 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK;
1542
1543 /* optional RSN capabilities */
1544 if (len >= 2) {
1545 rsn->rsn_caps = le16dec(frm);
1546 frm += 2, len -= 2;
1547 }
1548
1549 /* XXX PMK Count / PMKID */
1550
1551 /* XXX Group Cipher Management Suite */
1552
1553 return 0;
1554 }
1555
1556 /*
1557 * WPA/802.11i association request processing.
1558 */
1559 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)1560 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms,
1561 const struct ieee80211_frame *wh, const uint8_t *wpa,
1562 const uint8_t *rsn, uint16_t capinfo)
1563 {
1564 struct ieee80211vap *vap = ni->ni_vap;
1565 uint8_t reason;
1566 int badwparsn;
1567
1568 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN);
1569 if (wpa == NULL && rsn == NULL) {
1570 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) {
1571 /*
1572 * W-Fi Protected Setup (WPS) permits
1573 * clients to associate and pass EAPOL frames
1574 * to establish initial credentials.
1575 */
1576 ni->ni_flags |= IEEE80211_NODE_WPS;
1577 return 1;
1578 }
1579 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) &&
1580 (capinfo & IEEE80211_CAPINFO_PRIVACY)) {
1581 /*
1582 * Transitional Security Network. Permits clients
1583 * to associate and use WEP while WPA is configured.
1584 */
1585 ni->ni_flags |= IEEE80211_NODE_TSN;
1586 return 1;
1587 }
1588 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1589 wh, NULL, "%s", "no WPA/RSN IE in association request");
1590 vap->iv_stats.is_rx_assoc_badwpaie++;
1591 reason = IEEE80211_REASON_IE_INVALID;
1592 goto bad;
1593 }
1594 /* assert right association security credentials */
1595 badwparsn = 0; /* NB: to silence compiler */
1596 switch (vap->iv_flags & IEEE80211_F_WPA) {
1597 case IEEE80211_F_WPA1:
1598 badwparsn = (wpa == NULL);
1599 break;
1600 case IEEE80211_F_WPA2:
1601 badwparsn = (rsn == NULL);
1602 break;
1603 case IEEE80211_F_WPA1|IEEE80211_F_WPA2:
1604 badwparsn = (wpa == NULL && rsn == NULL);
1605 break;
1606 }
1607 if (badwparsn) {
1608 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1609 wh, NULL,
1610 "%s", "missing WPA/RSN IE in association request");
1611 vap->iv_stats.is_rx_assoc_badwpaie++;
1612 reason = IEEE80211_REASON_IE_INVALID;
1613 goto bad;
1614 }
1615 /*
1616 * Parse WPA/RSN information element.
1617 */
1618 if (wpa != NULL)
1619 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh);
1620 else
1621 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh);
1622 if (reason != 0) {
1623 /* XXX wpa->rsn fallback? */
1624 /* XXX distinguish WPA/RSN? */
1625 vap->iv_stats.is_rx_assoc_badwpaie++;
1626 goto bad;
1627 }
1628 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni,
1629 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x",
1630 wpa != NULL ? "WPA" : "RSN",
1631 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen,
1632 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen,
1633 rsnparms->rsn_keymgmt, rsnparms->rsn_caps);
1634
1635 return 1;
1636 bad:
1637 ieee80211_node_deauth(ni, reason);
1638 return 0;
1639 }
1640
1641 /* XXX find a better place for definition */
1642 struct l2_update_frame {
1643 struct ether_header eh;
1644 uint8_t dsap;
1645 uint8_t ssap;
1646 uint8_t control;
1647 uint8_t xid[3];
1648 } __packed;
1649
1650 /*
1651 * Deliver a TGf L2UF frame on behalf of a station.
1652 * This primes any bridge when the station is roaming
1653 * between ap's on the same wired network.
1654 */
1655 static void
ieee80211_deliver_l2uf(struct ieee80211_node * ni)1656 ieee80211_deliver_l2uf(struct ieee80211_node *ni)
1657 {
1658 struct ieee80211vap *vap = ni->ni_vap;
1659 struct ifnet *ifp = vap->iv_ifp;
1660 struct mbuf *m;
1661 struct l2_update_frame *l2uf;
1662 struct ether_header *eh;
1663
1664 m = m_gethdr(IEEE80211_M_NOWAIT, MT_DATA);
1665 if (m == NULL) {
1666 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1667 "%s", "no mbuf for l2uf frame");
1668 vap->iv_stats.is_rx_nobuf++; /* XXX not right */
1669 return;
1670 }
1671 l2uf = mtod(m, struct l2_update_frame *);
1672 eh = &l2uf->eh;
1673 /* dst: Broadcast address */
1674 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr);
1675 /* src: associated STA */
1676 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr);
1677 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh));
1678
1679 l2uf->dsap = 0;
1680 l2uf->ssap = 0;
1681 l2uf->control = 0xf5;
1682 l2uf->xid[0] = 0x81;
1683 l2uf->xid[1] = 0x80;
1684 l2uf->xid[2] = 0x00;
1685
1686 m->m_pkthdr.len = m->m_len = sizeof(*l2uf);
1687 hostap_deliver_data(vap, ni, m);
1688 }
1689
1690 static void
ratesetmismatch(struct ieee80211_node * ni,const struct ieee80211_frame * wh,int reassoc,int resp,const char * tag,int rate)1691 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1692 int reassoc, int resp, const char *tag, int rate)
1693 {
1694 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1695 "deny %s request, %s rate set mismatch, rate/MCS %d",
1696 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL);
1697 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE);
1698 ieee80211_node_leave(ni);
1699 }
1700
1701 static void
capinfomismatch(struct ieee80211_node * ni,const struct ieee80211_frame * wh,int reassoc,int resp,const char * tag,int capinfo)1702 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1703 int reassoc, int resp, const char *tag, int capinfo)
1704 {
1705 struct ieee80211vap *vap = ni->ni_vap;
1706
1707 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1708 "deny %s request, %s mismatch 0x%x",
1709 reassoc ? "reassoc" : "assoc", tag, capinfo);
1710 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO);
1711 ieee80211_node_leave(ni);
1712 vap->iv_stats.is_rx_assoc_capmismatch++;
1713 }
1714
1715 static void
htcapmismatch(struct ieee80211_node * ni,const struct ieee80211_frame * wh,int reassoc,int resp)1716 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1717 int reassoc, int resp)
1718 {
1719 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1720 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc");
1721 /* XXX no better code */
1722 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS);
1723 ieee80211_node_leave(ni);
1724 }
1725
1726 static void
authalgreject(struct ieee80211_node * ni,const struct ieee80211_frame * wh,int algo,int seq,int status)1727 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1728 int algo, int seq, int status)
1729 {
1730 struct ieee80211vap *vap = ni->ni_vap;
1731
1732 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1733 wh, NULL, "unsupported alg %d", algo);
1734 vap->iv_stats.is_rx_auth_unsupported++;
1735 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH,
1736 seq | (status << 16));
1737 }
1738
1739 static __inline int
ishtmixed(const uint8_t * ie)1740 ishtmixed(const uint8_t *ie)
1741 {
1742 const struct ieee80211_ie_htinfo *ht =
1743 (const struct ieee80211_ie_htinfo *) ie;
1744 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) ==
1745 IEEE80211_HTINFO_OPMODE_MIXED;
1746 }
1747
1748 static int
is11bclient(const uint8_t * rates,const uint8_t * xrates)1749 is11bclient(const uint8_t *rates, const uint8_t *xrates)
1750 {
1751 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
1752 int i;
1753
1754 /* NB: the 11b clients we care about will not have xrates */
1755 if (xrates != NULL || rates == NULL)
1756 return 0;
1757 for (i = 0; i < rates[1]; i++) {
1758 int r = rates[2+i] & IEEE80211_RATE_VAL;
1759 if (r > 2*11 || ((1<<r) & brates) == 0)
1760 return 0;
1761 }
1762 return 1;
1763 }
1764
1765 /**
1766 * Check if the given cipher is valid for 802.11 HT operation.
1767 *
1768 * The 802.11 specification only allows HT A-MPDU to be performed
1769 * on CCMP / GCMP encrypted frames. The WEP/TKIP hardware crypto
1770 * implementations may not meet the timing required for A-MPDU
1771 * operation.
1772 *
1773 * @param cipher the IEEE80211_CIPHER_ value to check
1774 * @returns true if the cipher is valid for HT A-MPDU, false otherwise
1775 */
1776 static bool
hostapd_validate_cipher_for_ht_ampdu(uint8_t cipher)1777 hostapd_validate_cipher_for_ht_ampdu(uint8_t cipher)
1778 {
1779 switch (cipher) {
1780 case IEEE80211_CIPHER_AES_CCM:
1781 case IEEE80211_CIPHER_AES_GCM_128:
1782 return true;
1783 default:
1784 return false;
1785 }
1786 }
1787
1788 static void
hostap_recv_mgmt(struct ieee80211_node * ni,struct mbuf * m0,int subtype,const struct ieee80211_rx_stats * rxs,int rssi,int nf)1789 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1790 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
1791 {
1792 struct ieee80211vap *vap = ni->ni_vap;
1793 struct ieee80211com *ic = ni->ni_ic;
1794 struct ieee80211_frame *wh;
1795 uint8_t *frm, *efrm, *sfrm;
1796 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap;
1797 uint8_t *vhtcap, *vhtinfo;
1798 int reassoc, resp;
1799 uint8_t rate;
1800
1801 wh = mtod(m0, struct ieee80211_frame *);
1802 frm = (uint8_t *)&wh[1];
1803 efrm = mtod(m0, uint8_t *) + m0->m_len;
1804 switch (subtype) {
1805 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1806 /*
1807 * We process beacon/probe response frames when scanning;
1808 * otherwise we check beacon frames for overlapping non-ERP
1809 * BSS in 11g and/or overlapping legacy BSS when in HT.
1810 */
1811 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
1812 vap->iv_stats.is_rx_mgtdiscard++;
1813 return;
1814 }
1815 /* FALLTHROUGH */
1816 case IEEE80211_FC0_SUBTYPE_BEACON: {
1817 struct ieee80211_scanparams scan;
1818
1819 /* NB: accept off-channel frames */
1820 /* XXX TODO: use rxstatus to determine off-channel details */
1821 if (ieee80211_parse_beacon(ni, m0, ic->ic_curchan, &scan) &~ IEEE80211_BPARSE_OFFCHAN)
1822 return;
1823 /*
1824 * Count frame now that we know it's to be processed.
1825 */
1826 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1827 vap->iv_stats.is_rx_beacon++; /* XXX remove */
1828 IEEE80211_NODE_STAT(ni, rx_beacons);
1829 } else
1830 IEEE80211_NODE_STAT(ni, rx_proberesp);
1831 /*
1832 * If scanning, just pass information to the scan module.
1833 */
1834 if (ic->ic_flags & IEEE80211_F_SCAN) {
1835 if (scan.status == 0 && /* NB: on channel */
1836 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) {
1837 /*
1838 * Actively scanning a channel marked passive;
1839 * send a probe request now that we know there
1840 * is 802.11 traffic present.
1841 *
1842 * XXX check if the beacon we recv'd gives
1843 * us what we need and suppress the probe req
1844 */
1845 ieee80211_probe_curchan(vap, true);
1846 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1847 }
1848 ieee80211_add_scan(vap, ic->ic_curchan, &scan, wh,
1849 subtype, rssi, nf);
1850 return;
1851 }
1852 /*
1853 * Check beacon for overlapping bss w/ non ERP stations.
1854 * If we detect one and protection is configured but not
1855 * enabled, enable it and start a timer that'll bring us
1856 * out if we stop seeing the bss.
1857 */
1858 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1859 scan.status == 0 && /* NB: on-channel */
1860 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/
1861 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) {
1862 vap->iv_lastnonerp = ticks;
1863 vap->iv_flags_ext |= IEEE80211_FEXT_NONERP_PR;
1864 /*
1865 * XXX TODO: this may need to check all VAPs?
1866 */
1867 if (vap->iv_protmode != IEEE80211_PROT_NONE &&
1868 (vap->iv_flags & IEEE80211_F_USEPROT) == 0) {
1869 IEEE80211_NOTE_FRAME(vap,
1870 IEEE80211_MSG_ASSOC, wh,
1871 "non-ERP present on channel %d "
1872 "(saw erp 0x%x from channel %d), "
1873 "enable use of protection",
1874 ic->ic_curchan->ic_ieee,
1875 scan.erp, scan.chan);
1876 vap->iv_flags |= IEEE80211_F_USEPROT;
1877 ieee80211_vap_update_erp_protmode(vap);
1878 }
1879 }
1880 /*
1881 * Check beacon for non-HT station on HT channel
1882 * and update HT BSS occupancy as appropriate.
1883 */
1884 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) {
1885 if (scan.status & IEEE80211_BPARSE_OFFCHAN) {
1886 /*
1887 * Off control channel; only check frames
1888 * that come in the extension channel when
1889 * operating w/ HT40.
1890 */
1891 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan))
1892 break;
1893 if (scan.chan != ic->ic_curchan->ic_extieee)
1894 break;
1895 }
1896 if (scan.htinfo == NULL) {
1897 ieee80211_htprot_update(vap,
1898 IEEE80211_HTINFO_OPMODE_PROTOPT |
1899 IEEE80211_HTINFO_NONHT_PRESENT);
1900 } else if (ishtmixed(scan.htinfo)) {
1901 /* XXX? take NONHT_PRESENT from beacon? */
1902 ieee80211_htprot_update(vap,
1903 IEEE80211_HTINFO_OPMODE_MIXED |
1904 IEEE80211_HTINFO_NONHT_PRESENT);
1905 }
1906 }
1907 break;
1908 }
1909
1910 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1911 if (vap->iv_state != IEEE80211_S_RUN) {
1912 vap->iv_stats.is_rx_mgtdiscard++;
1913 return;
1914 }
1915 /*
1916 * Consult the ACL policy module if setup.
1917 */
1918 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) {
1919 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1920 wh, NULL, "%s", "disallowed by ACL");
1921 vap->iv_stats.is_rx_acl++;
1922 return;
1923 }
1924 /*
1925 * prreq frame format
1926 * [tlv] ssid
1927 * [tlv] supported rates
1928 * [tlv] extended supported rates
1929 */
1930 ssid = rates = xrates = NULL;
1931 while (efrm - frm > 1) {
1932 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1933 switch (*frm) {
1934 case IEEE80211_ELEMID_SSID:
1935 ssid = frm;
1936 break;
1937 case IEEE80211_ELEMID_RATES:
1938 rates = frm;
1939 break;
1940 case IEEE80211_ELEMID_XRATES:
1941 xrates = frm;
1942 break;
1943 }
1944 frm += frm[1] + 2;
1945 }
1946 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1947 if (xrates != NULL)
1948 IEEE80211_VERIFY_ELEMENT(xrates,
1949 IEEE80211_RATE_MAXSIZE - rates[1], return);
1950 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
1951 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
1952 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
1953 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1954 wh, NULL,
1955 "%s", "no ssid with ssid suppression enabled");
1956 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
1957 return;
1958 }
1959
1960 /* XXX find a better class or define it's own */
1961 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
1962 "%s", "recv probe req");
1963 /*
1964 * Some legacy 11b clients cannot hack a complete
1965 * probe response frame. When the request includes
1966 * only a bare-bones rate set, communicate this to
1967 * the transmit side.
1968 */
1969 ieee80211_send_proberesp(vap, wh->i_addr2,
1970 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
1971 break;
1972
1973 case IEEE80211_FC0_SUBTYPE_AUTH: {
1974 uint16_t algo, seq, status;
1975
1976 if (vap->iv_state != IEEE80211_S_RUN) {
1977 vap->iv_stats.is_rx_mgtdiscard++;
1978 return;
1979 }
1980 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1981 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1982 wh, NULL, "%s", "wrong bssid");
1983 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/
1984 return;
1985 }
1986 /*
1987 * auth frame format
1988 * [2] algorithm
1989 * [2] sequence
1990 * [2] status
1991 * [tlv*] challenge
1992 */
1993 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1994 algo = le16toh(*(uint16_t *)frm);
1995 seq = le16toh(*(uint16_t *)(frm + 2));
1996 status = le16toh(*(uint16_t *)(frm + 4));
1997 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1998 "recv auth frame with algorithm %d seq %d", algo, seq);
1999 /*
2000 * Consult the ACL policy module if setup.
2001 */
2002 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) {
2003 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
2004 wh, NULL, "%s", "disallowed by ACL");
2005 vap->iv_stats.is_rx_acl++;
2006 ieee80211_send_error(ni, wh->i_addr2,
2007 IEEE80211_FC0_SUBTYPE_AUTH,
2008 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16));
2009 return;
2010 }
2011 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
2012 IEEE80211_DISCARD(vap,
2013 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
2014 wh, NULL, "%s", "TKIP countermeasures enabled");
2015 vap->iv_stats.is_rx_auth_countermeasures++;
2016 ieee80211_send_error(ni, wh->i_addr2,
2017 IEEE80211_FC0_SUBTYPE_AUTH,
2018 IEEE80211_REASON_MIC_FAILURE);
2019 return;
2020 }
2021 if (algo == IEEE80211_AUTH_ALG_SHARED)
2022 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
2023 seq, status);
2024 else if (algo == IEEE80211_AUTH_ALG_OPEN)
2025 hostap_auth_open(ni, wh, rssi, nf, seq, status);
2026 else if (algo == IEEE80211_AUTH_ALG_LEAP) {
2027 authalgreject(ni, wh, algo,
2028 seq+1, IEEE80211_STATUS_ALG);
2029 return;
2030 } else {
2031 /*
2032 * We assume that an unknown algorithm is the result
2033 * of a decryption failure on a shared key auth frame;
2034 * return a status code appropriate for that instead
2035 * of IEEE80211_STATUS_ALG.
2036 *
2037 * NB: a seq# of 4 is intentional; the decrypted
2038 * frame likely has a bogus seq value.
2039 */
2040 authalgreject(ni, wh, algo,
2041 4, IEEE80211_STATUS_CHALLENGE);
2042 return;
2043 }
2044 break;
2045 }
2046
2047 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
2048 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
2049 uint16_t capinfo, lintval;
2050 struct ieee80211_rsnparms rsnparms;
2051
2052 if (vap->iv_state != IEEE80211_S_RUN) {
2053 vap->iv_stats.is_rx_mgtdiscard++;
2054 return;
2055 }
2056 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
2057 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2058 wh, NULL, "%s", "wrong bssid");
2059 vap->iv_stats.is_rx_assoc_bss++;
2060 return;
2061 }
2062 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
2063 reassoc = 1;
2064 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
2065 } else {
2066 reassoc = 0;
2067 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
2068 }
2069 if (ni == vap->iv_bss) {
2070 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
2071 "deny %s request, sta not authenticated",
2072 reassoc ? "reassoc" : "assoc");
2073 ieee80211_send_error(ni, wh->i_addr2,
2074 IEEE80211_FC0_SUBTYPE_DEAUTH,
2075 IEEE80211_REASON_ASSOC_NOT_AUTHED);
2076 vap->iv_stats.is_rx_assoc_notauth++;
2077 return;
2078 }
2079
2080 /*
2081 * asreq frame format
2082 * [2] capability information
2083 * [2] listen interval
2084 * [6*] current AP address (reassoc only)
2085 * [tlv] ssid
2086 * [tlv] supported rates
2087 * [tlv] extended supported rates
2088 * [tlv] WPA or RSN
2089 * [tlv] HT capabilities
2090 * [tlv] Atheros capabilities
2091 */
2092 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return);
2093 capinfo = le16toh(*(uint16_t *)frm); frm += 2;
2094 lintval = le16toh(*(uint16_t *)frm); frm += 2;
2095 if (reassoc)
2096 frm += 6; /* ignore current AP info */
2097 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL;
2098 vhtcap = vhtinfo = NULL;
2099 sfrm = frm;
2100 while (efrm - frm > 1) {
2101 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
2102 switch (*frm) {
2103 case IEEE80211_ELEMID_SSID:
2104 ssid = frm;
2105 break;
2106 case IEEE80211_ELEMID_RATES:
2107 rates = frm;
2108 break;
2109 case IEEE80211_ELEMID_XRATES:
2110 xrates = frm;
2111 break;
2112 case IEEE80211_ELEMID_RSN:
2113 rsn = frm;
2114 break;
2115 case IEEE80211_ELEMID_HTCAP:
2116 htcap = frm;
2117 break;
2118 case IEEE80211_ELEMID_VHT_CAP:
2119 vhtcap = frm;
2120 break;
2121 case IEEE80211_ELEMID_VHT_OPMODE:
2122 vhtinfo = frm;
2123 break;
2124 case IEEE80211_ELEMID_VENDOR:
2125 if (iswpaoui(frm))
2126 wpa = frm;
2127 else if (iswmeinfo(frm))
2128 wme = frm;
2129 #ifdef IEEE80211_SUPPORT_SUPERG
2130 else if (isatherosoui(frm))
2131 ath = frm;
2132 #endif
2133 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
2134 if (ishtcapoui(frm) && htcap == NULL)
2135 htcap = frm;
2136 }
2137 break;
2138 }
2139 frm += frm[1] + 2;
2140 }
2141 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
2142 if (xrates != NULL)
2143 IEEE80211_VERIFY_ELEMENT(xrates,
2144 IEEE80211_RATE_MAXSIZE - rates[1], return);
2145 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
2146 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
2147 if (htcap != NULL) {
2148 IEEE80211_VERIFY_LENGTH(htcap[1],
2149 htcap[0] == IEEE80211_ELEMID_VENDOR ?
2150 4 + sizeof(struct ieee80211_ie_htcap)-2 :
2151 sizeof(struct ieee80211_ie_htcap)-2,
2152 return); /* XXX just NULL out? */
2153 }
2154
2155 /* Validate VHT IEs */
2156 if (vhtcap != NULL) {
2157 IEEE80211_VERIFY_LENGTH(vhtcap[1],
2158 sizeof(struct ieee80211_vht_cap),
2159 return);
2160 }
2161 if (vhtinfo != NULL) {
2162 IEEE80211_VERIFY_LENGTH(vhtinfo[1],
2163 sizeof(struct ieee80211_vht_operation),
2164 return);
2165 }
2166
2167 if ((vap->iv_flags & IEEE80211_F_WPA) &&
2168 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo))
2169 return;
2170 /* discard challenge after association */
2171 if (ni->ni_challenge != NULL) {
2172 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
2173 ni->ni_challenge = NULL;
2174 }
2175 /* NB: 802.11 spec says to ignore station's privacy bit */
2176 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
2177 capinfomismatch(ni, wh, reassoc, resp,
2178 "capability", capinfo);
2179 return;
2180 }
2181 /*
2182 * Disallow re-associate w/ invalid slot time setting.
2183 */
2184 if (ni->ni_associd != 0 &&
2185 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2186 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
2187 capinfomismatch(ni, wh, reassoc, resp,
2188 "slot time", capinfo);
2189 return;
2190 }
2191 rate = ieee80211_setup_rates(ni, rates, xrates,
2192 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
2193 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
2194 if (rate & IEEE80211_RATE_BASIC) {
2195 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate);
2196 vap->iv_stats.is_rx_assoc_norate++;
2197 return;
2198 }
2199 /*
2200 * If constrained to 11g-only stations reject an
2201 * 11b-only station. We cheat a bit here by looking
2202 * at the max negotiated xmit rate and assuming anyone
2203 * with a best rate <24Mb/s is an 11b station.
2204 */
2205 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) {
2206 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate);
2207 vap->iv_stats.is_rx_assoc_norate++;
2208 return;
2209 }
2210
2211 /*
2212 * Do HT rate set handling and setup HT node state.
2213 */
2214 ni->ni_chan = vap->iv_bss->ni_chan;
2215
2216 /* VHT */
2217 if (IEEE80211_IS_CHAN_VHT(ni->ni_chan) &&
2218 vhtcap != NULL &&
2219 vhtinfo != NULL) {
2220 /* XXX TODO; see below */
2221 printf("%s: VHT TODO!\n", __func__);
2222 ieee80211_vht_node_init(ni);
2223 ieee80211_vht_update_cap(ni, vhtcap, vhtinfo);
2224 } else if (ni->ni_flags & IEEE80211_NODE_VHT)
2225 ieee80211_vht_node_cleanup(ni);
2226
2227 /* HT */
2228 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2229 rate = ieee80211_setup_htrates(ni, htcap,
2230 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO |
2231 IEEE80211_F_DOBRS);
2232 if (rate & IEEE80211_RATE_BASIC) {
2233 ratesetmismatch(ni, wh, reassoc, resp,
2234 "HT", rate);
2235 vap->iv_stats.is_ht_assoc_norate++;
2236 return;
2237 }
2238 ieee80211_ht_node_init(ni);
2239 ieee80211_ht_updatehtcap(ni, htcap);
2240 } else if (ni->ni_flags & IEEE80211_NODE_HT)
2241 ieee80211_ht_node_cleanup(ni);
2242
2243 /* Finally - this will use HT/VHT info to change node channel */
2244 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2245 ieee80211_ht_updatehtcap_final(ni);
2246 }
2247
2248 #ifdef IEEE80211_SUPPORT_SUPERG
2249 /* Always do ff node cleanup; for A-MSDU */
2250 ieee80211_ff_node_cleanup(ni);
2251 #endif
2252 /*
2253 * Allow AMPDU operation only with unencrypted traffic
2254 * or AES-CCM / AES-GCM; the 802.11n spec only specifies these
2255 * ciphers so permitting any others is undefined and can lead
2256 * to interoperability problems.
2257 *
2258 * TODO: before landing, find exactly where in 802.11-2020 this
2259 * is called out!
2260 */
2261 if ((ni->ni_flags & IEEE80211_NODE_HT) &&
2262 (((vap->iv_flags & IEEE80211_F_WPA) &&
2263 !hostapd_validate_cipher_for_ht_ampdu(rsnparms.rsn_ucastcipher)) ||
2264 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) {
2265 IEEE80211_NOTE(vap,
2266 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
2267 "disallow HT use because WEP or TKIP requested, "
2268 "capinfo 0x%x ucastcipher %d", capinfo,
2269 rsnparms.rsn_ucastcipher);
2270 ieee80211_ht_node_cleanup(ni);
2271 #ifdef IEEE80211_SUPPORT_SUPERG
2272 /* Always do ff node cleanup; for A-MSDU */
2273 ieee80211_ff_node_cleanup(ni);
2274 #endif
2275 vap->iv_stats.is_ht_assoc_downgrade++;
2276 }
2277 /*
2278 * If constrained to 11n-only stations reject legacy stations.
2279 */
2280 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) &&
2281 (ni->ni_flags & IEEE80211_NODE_HT) == 0) {
2282 htcapmismatch(ni, wh, reassoc, resp);
2283 vap->iv_stats.is_ht_assoc_nohtcap++;
2284 return;
2285 }
2286 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
2287 ni->ni_noise = nf;
2288 ni->ni_intval = lintval;
2289 ni->ni_capinfo = capinfo;
2290 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell;
2291 ni->ni_fhindex = vap->iv_bss->ni_fhindex;
2292 /*
2293 * Store the IEs.
2294 * XXX maybe better to just expand
2295 */
2296 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) {
2297 #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off)
2298 if (wpa != NULL)
2299 setie(wpa_ie, wpa - sfrm);
2300 if (rsn != NULL)
2301 setie(rsn_ie, rsn - sfrm);
2302 if (htcap != NULL)
2303 setie(htcap_ie, htcap - sfrm);
2304 if (wme != NULL) {
2305 setie(wme_ie, wme - sfrm);
2306 /*
2307 * Mark node as capable of QoS.
2308 */
2309 ni->ni_flags |= IEEE80211_NODE_QOS;
2310 if (ieee80211_parse_wmeie(wme, wh, ni) > 0) {
2311 if (ni->ni_uapsd != 0)
2312 ni->ni_flags |=
2313 IEEE80211_NODE_UAPSD;
2314 else
2315 ni->ni_flags &=
2316 ~IEEE80211_NODE_UAPSD;
2317 }
2318 } else
2319 ni->ni_flags &=
2320 ~(IEEE80211_NODE_QOS |
2321 IEEE80211_NODE_UAPSD);
2322 #ifdef IEEE80211_SUPPORT_SUPERG
2323 if (ath != NULL) {
2324 setie(ath_ie, ath - sfrm);
2325 /*
2326 * Parse ATH station parameters.
2327 */
2328 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
2329 } else
2330 #endif
2331 ni->ni_ath_flags = 0;
2332 #undef setie
2333 } else {
2334 ni->ni_flags &= ~IEEE80211_NODE_QOS;
2335 ni->ni_flags &= ~IEEE80211_NODE_UAPSD;
2336 ni->ni_ath_flags = 0;
2337 }
2338 ieee80211_node_join(ni, resp);
2339 ieee80211_deliver_l2uf(ni);
2340 break;
2341 }
2342
2343 case IEEE80211_FC0_SUBTYPE_DEAUTH:
2344 case IEEE80211_FC0_SUBTYPE_DISASSOC: {
2345 #ifdef IEEE80211_DEBUG
2346 uint16_t reason;
2347 #endif
2348
2349 if (vap->iv_state != IEEE80211_S_RUN ||
2350 /* NB: can happen when in promiscuous mode */
2351 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
2352 vap->iv_stats.is_rx_mgtdiscard++;
2353 break;
2354 }
2355 /*
2356 * deauth/disassoc frame format
2357 * [2] reason
2358 */
2359 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
2360 #ifdef IEEE80211_DEBUG
2361 reason = le16toh(*(uint16_t *)frm);
2362 #endif
2363 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) {
2364 vap->iv_stats.is_rx_deauth++;
2365 IEEE80211_NODE_STAT(ni, rx_deauth);
2366 } else {
2367 vap->iv_stats.is_rx_disassoc++;
2368 IEEE80211_NODE_STAT(ni, rx_disassoc);
2369 }
2370 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2371 "recv %s (reason: %d (%s))",
2372 ieee80211_mgt_subtype_name(subtype),
2373 reason, ieee80211_reason_to_string(reason));
2374 if (ni != vap->iv_bss)
2375 ieee80211_node_leave(ni);
2376 break;
2377 }
2378
2379 case IEEE80211_FC0_SUBTYPE_ACTION:
2380 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
2381 if (ni == vap->iv_bss) {
2382 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2383 wh, NULL, "%s", "unknown node");
2384 vap->iv_stats.is_rx_mgtdiscard++;
2385 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
2386 !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
2387 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2388 wh, NULL, "%s", "not for us");
2389 vap->iv_stats.is_rx_mgtdiscard++;
2390 } else if (vap->iv_state != IEEE80211_S_RUN) {
2391 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2392 wh, NULL, "wrong state %s",
2393 ieee80211_state_name[vap->iv_state]);
2394 vap->iv_stats.is_rx_mgtdiscard++;
2395 } else {
2396 if (ieee80211_parse_action(ni, m0) == 0)
2397 (void)ic->ic_recv_action(ni, wh, frm, efrm);
2398 }
2399 break;
2400
2401 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2402 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2403 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
2404 case IEEE80211_FC0_SUBTYPE_ATIM:
2405 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2406 wh, NULL, "%s", "not handled");
2407 vap->iv_stats.is_rx_mgtdiscard++;
2408 break;
2409
2410 default:
2411 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2412 wh, "mgt", "subtype 0x%x not handled", subtype);
2413 vap->iv_stats.is_rx_badsubtype++;
2414 break;
2415 }
2416 }
2417
2418 static void
hostap_recv_ctl(struct ieee80211_node * ni,struct mbuf * m,int subtype)2419 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
2420 {
2421 switch (subtype) {
2422 case IEEE80211_FC0_SUBTYPE_PS_POLL:
2423 ni->ni_vap->iv_recv_pspoll(ni, m);
2424 break;
2425 case IEEE80211_FC0_SUBTYPE_BAR:
2426 ieee80211_recv_bar(ni, m);
2427 break;
2428 }
2429 }
2430
2431 /*
2432 * Process a received ps-poll frame.
2433 */
2434 void
ieee80211_recv_pspoll(struct ieee80211_node * ni,struct mbuf * m0)2435 ieee80211_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
2436 {
2437 struct ieee80211vap *vap = ni->ni_vap;
2438 struct ieee80211com *ic = vap->iv_ic;
2439 struct ieee80211_frame_min *wh;
2440 struct mbuf *m;
2441 uint16_t aid;
2442 int qlen;
2443
2444 wh = mtod(m0, struct ieee80211_frame_min *);
2445 if (ni->ni_associd == 0) {
2446 IEEE80211_DISCARD(vap,
2447 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2448 (struct ieee80211_frame *) wh, NULL,
2449 "%s", "unassociated station");
2450 vap->iv_stats.is_ps_unassoc++;
2451 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
2452 IEEE80211_REASON_NOT_ASSOCED);
2453 return;
2454 }
2455
2456 aid = le16toh(*(uint16_t *)wh->i_dur);
2457 if (aid != ni->ni_associd) {
2458 IEEE80211_DISCARD(vap,
2459 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2460 (struct ieee80211_frame *) wh, NULL,
2461 "aid mismatch: sta aid 0x%x poll aid 0x%x",
2462 ni->ni_associd, aid);
2463 vap->iv_stats.is_ps_badaid++;
2464 /*
2465 * NB: We used to deauth the station but it turns out
2466 * the Blackberry Curve 8230 (and perhaps other devices)
2467 * sometimes send the wrong AID when WME is negotiated.
2468 * Being more lenient here seems ok as we already check
2469 * the station is associated and we only return frames
2470 * queued for the station (i.e. we don't use the AID).
2471 */
2472 return;
2473 }
2474
2475 /* Okay, take the first queued packet and put it out... */
2476 m = ieee80211_node_psq_dequeue(ni, &qlen);
2477 if (m == NULL) {
2478 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2,
2479 "%s", "recv ps-poll, but queue empty");
2480 ieee80211_send_nulldata(ieee80211_ref_node(ni));
2481 vap->iv_stats.is_ps_qempty++; /* XXX node stat */
2482 if (vap->iv_set_tim != NULL)
2483 vap->iv_set_tim(ni, 0); /* just in case */
2484 return;
2485 }
2486 /*
2487 * If there are more packets, set the more packets bit
2488 * in the packet dispatched to the station; otherwise
2489 * turn off the TIM bit.
2490 */
2491 if (qlen != 0) {
2492 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2493 "recv ps-poll, send packet, %u still queued", qlen);
2494 m->m_flags |= M_MORE_DATA;
2495 } else {
2496 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2497 "%s", "recv ps-poll, send packet, queue empty");
2498 if (vap->iv_set_tim != NULL)
2499 vap->iv_set_tim(ni, 0);
2500 }
2501 m->m_flags |= M_PWR_SAV; /* bypass PS handling */
2502
2503 /*
2504 * Do the right thing; if it's an encap'ed frame then
2505 * call ieee80211_parent_xmitpkt() else
2506 * call ieee80211_vap_xmitpkt().
2507 */
2508 if (m->m_flags & M_ENCAP) {
2509 (void) ieee80211_parent_xmitpkt(ic, m);
2510 } else {
2511 (void) ieee80211_vap_xmitpkt(vap, m);
2512 }
2513 }
2514