1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 __FBSDID("$FreeBSD$");
31 #endif
32
33 /*
34 * IEEE 802.11 HOSTAP mode support.
35 */
36 #include "opt_inet.h"
37 #include "opt_wlan.h"
38
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/mbuf.h>
42 #include <sys/malloc.h>
43 #include <sys/kernel.h>
44
45 #include <sys/socket.h>
46 #include <sys/sockio.h>
47 #include <sys/endian.h>
48 #include <sys/errno.h>
49 #include <sys/proc.h>
50 #include <sys/sysctl.h>
51
52 #include <net/if.h>
53 #include <net/if_var.h>
54 #include <net/if_media.h>
55 #include <net/if_llc.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, 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 /*
427 * Mark frame as coming from vap's interface.
428 */
429 m->m_pkthdr.rcvif = ifp;
430 if (m->m_flags & M_MCAST) {
431 /*
432 * Spam DWDS vap's w/ multicast traffic.
433 */
434 /* XXX only if dwds in use? */
435 ieee80211_dwds_mcast(vap, m);
436 }
437 if (ni->ni_vlan != 0) {
438 /* attach vlan tag */
439 m->m_pkthdr.ether_vtag = ni->ni_vlan;
440 m->m_flags |= M_VLANTAG;
441 }
442 ifp->if_input(ifp, m);
443 }
444 }
445
446 /*
447 * Decide if a received management frame should be
448 * printed when debugging is enabled. This filters some
449 * of the less interesting frames that come frequently
450 * (e.g. beacons).
451 */
452 static __inline int
doprint(struct ieee80211vap * vap,int subtype)453 doprint(struct ieee80211vap *vap, int subtype)
454 {
455 switch (subtype) {
456 case IEEE80211_FC0_SUBTYPE_BEACON:
457 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
458 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
459 return 0;
460 }
461 return 1;
462 }
463
464 /*
465 * Process a received frame. The node associated with the sender
466 * should be supplied. If nothing was found in the node table then
467 * the caller is assumed to supply a reference to iv_bss instead.
468 * The RSSI and a timestamp are also supplied. The RSSI data is used
469 * during AP scanning to select a AP to associate with; it can have
470 * any units so long as values have consistent units and higher values
471 * mean ``better signal''. The receive timestamp is currently not used
472 * by the 802.11 layer.
473 */
474 static int
hostap_input(struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_rx_stats * rxs,int rssi,int nf)475 hostap_input(struct ieee80211_node *ni, struct mbuf *m,
476 const struct ieee80211_rx_stats *rxs, int rssi, int nf)
477 {
478 struct ieee80211vap *vap = ni->ni_vap;
479 struct ieee80211com *ic = ni->ni_ic;
480 struct ifnet *ifp = vap->iv_ifp;
481 struct ieee80211_frame *wh;
482 struct ieee80211_key *key;
483 struct ether_header *eh;
484 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
485 uint8_t dir, type, subtype, qos;
486 uint8_t *bssid;
487 int is_hw_decrypted = 0;
488 int has_decrypted = 0;
489
490 /*
491 * Some devices do hardware decryption all the way through
492 * to pretending the frame wasn't encrypted in the first place.
493 * So, tag it appropriately so it isn't discarded inappropriately.
494 */
495 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED))
496 is_hw_decrypted = 1;
497
498 if (m->m_flags & M_AMPDU_MPDU) {
499 /*
500 * Fastpath for A-MPDU reorder q resubmission. Frames
501 * w/ M_AMPDU_MPDU marked have already passed through
502 * here but were received out of order and been held on
503 * the reorder queue. When resubmitted they are marked
504 * with the M_AMPDU_MPDU flag and we can bypass most of
505 * the normal processing.
506 */
507 wh = mtod(m, struct ieee80211_frame *);
508 type = IEEE80211_FC0_TYPE_DATA;
509 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
510 subtype = IEEE80211_FC0_SUBTYPE_QOS;
511 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
512 goto resubmit_ampdu;
513 }
514
515 KASSERT(ni != NULL, ("null node"));
516 ni->ni_inact = ni->ni_inact_reload;
517
518 type = -1; /* undefined */
519
520 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
521 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
522 ni->ni_macaddr, NULL,
523 "too short (1): len %u", m->m_pkthdr.len);
524 vap->iv_stats.is_rx_tooshort++;
525 goto out;
526 }
527 /*
528 * Bit of a cheat here, we use a pointer for a 3-address
529 * frame format but don't reference fields past outside
530 * ieee80211_frame_min w/o first validating the data is
531 * present.
532 */
533 wh = mtod(m, struct ieee80211_frame *);
534
535 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
536 IEEE80211_FC0_VERSION_0) {
537 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
538 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
539 wh->i_fc[0], wh->i_fc[1]);
540 vap->iv_stats.is_rx_badversion++;
541 goto err;
542 }
543
544 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
545 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
546 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
547 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
548 if (dir != IEEE80211_FC1_DIR_NODS)
549 bssid = wh->i_addr1;
550 else if (type == IEEE80211_FC0_TYPE_CTL)
551 bssid = wh->i_addr1;
552 else {
553 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
554 IEEE80211_DISCARD_MAC(vap,
555 IEEE80211_MSG_ANY, ni->ni_macaddr,
556 NULL, "too short (2): len %u",
557 m->m_pkthdr.len);
558 vap->iv_stats.is_rx_tooshort++;
559 goto out;
560 }
561 bssid = wh->i_addr3;
562 }
563 /*
564 * Validate the bssid.
565 */
566 if (!(type == IEEE80211_FC0_TYPE_MGT &&
567 subtype == IEEE80211_FC0_SUBTYPE_BEACON) &&
568 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
569 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
570 /* not interested in */
571 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
572 bssid, NULL, "%s", "not to bss");
573 vap->iv_stats.is_rx_wrongbss++;
574 goto out;
575 }
576
577 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
578 ni->ni_noise = nf;
579 if (IEEE80211_HAS_SEQ(type, subtype)) {
580 uint8_t tid = ieee80211_gettid(wh);
581 if (IEEE80211_QOS_HAS_SEQ(wh) &&
582 TID_TO_WME_AC(tid) >= WME_AC_VI)
583 ic->ic_wme.wme_hipri_traffic++;
584 if (! ieee80211_check_rxseq(ni, wh, bssid, rxs))
585 goto out;
586 }
587 }
588
589 switch (type) {
590 case IEEE80211_FC0_TYPE_DATA:
591 hdrspace = ieee80211_hdrspace(ic, wh);
592 if (m->m_len < hdrspace &&
593 (m = m_pullup(m, hdrspace)) == NULL) {
594 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
595 ni->ni_macaddr, NULL,
596 "data too short: expecting %u", hdrspace);
597 vap->iv_stats.is_rx_tooshort++;
598 goto out; /* XXX */
599 }
600 if (!(dir == IEEE80211_FC1_DIR_TODS ||
601 (dir == IEEE80211_FC1_DIR_DSTODS &&
602 (vap->iv_flags & IEEE80211_F_DWDS)))) {
603 if (dir != IEEE80211_FC1_DIR_DSTODS) {
604 IEEE80211_DISCARD(vap,
605 IEEE80211_MSG_INPUT, wh, "data",
606 "incorrect dir 0x%x", dir);
607 } else {
608 IEEE80211_DISCARD(vap,
609 IEEE80211_MSG_INPUT |
610 IEEE80211_MSG_WDS, wh,
611 "4-address data",
612 "%s", "DWDS not enabled");
613 }
614 vap->iv_stats.is_rx_wrongdir++;
615 goto out;
616 }
617 /* check if source STA is associated */
618 if (ni == vap->iv_bss) {
619 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
620 wh, "data", "%s", "unknown src");
621 ieee80211_send_error(ni, wh->i_addr2,
622 IEEE80211_FC0_SUBTYPE_DEAUTH,
623 IEEE80211_REASON_NOT_AUTHED);
624 vap->iv_stats.is_rx_notassoc++;
625 goto err;
626 }
627 if (ni->ni_associd == 0) {
628 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
629 wh, "data", "%s", "unassoc src");
630 IEEE80211_SEND_MGMT(ni,
631 IEEE80211_FC0_SUBTYPE_DISASSOC,
632 IEEE80211_REASON_NOT_ASSOCED);
633 vap->iv_stats.is_rx_notassoc++;
634 goto err;
635 }
636
637 /*
638 * Check for power save state change.
639 * XXX out-of-order A-MPDU frames?
640 */
641 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^
642 (ni->ni_flags & IEEE80211_NODE_PWR_MGT)))
643 vap->iv_node_ps(ni,
644 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT);
645 /*
646 * For 4-address packets handle WDS discovery
647 * notifications. Once a WDS link is setup frames
648 * are just delivered to the WDS vap (see below).
649 */
650 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) {
651 if (!ieee80211_node_is_authorized(ni)) {
652 IEEE80211_DISCARD(vap,
653 IEEE80211_MSG_INPUT |
654 IEEE80211_MSG_WDS, wh,
655 "4-address data",
656 "%s", "unauthorized port");
657 vap->iv_stats.is_rx_unauth++;
658 IEEE80211_NODE_STAT(ni, rx_unauth);
659 goto err;
660 }
661 ieee80211_dwds_discover(ni, m);
662 return type;
663 }
664
665 /*
666 * Handle A-MPDU re-ordering. If the frame is to be
667 * processed directly then ieee80211_ampdu_reorder
668 * will return 0; otherwise it has consumed the mbuf
669 * and we should do nothing more with it.
670 */
671 if ((m->m_flags & M_AMPDU) &&
672 ieee80211_ampdu_reorder(ni, m, rxs) != 0) {
673 m = NULL;
674 goto out;
675 }
676 resubmit_ampdu:
677
678 /*
679 * Handle privacy requirements. Note that we
680 * must not be preempted from here until after
681 * we (potentially) call ieee80211_crypto_demic;
682 * otherwise we may violate assumptions in the
683 * crypto cipher modules used to do delayed update
684 * of replay sequence numbers.
685 */
686 if (is_hw_decrypted || wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
687 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
688 /*
689 * Discard encrypted frames when privacy is off.
690 */
691 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
692 wh, "WEP", "%s", "PRIVACY off");
693 vap->iv_stats.is_rx_noprivacy++;
694 IEEE80211_NODE_STAT(ni, rx_noprivacy);
695 goto out;
696 }
697 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
698 /* NB: stats+msgs handled in crypto_decap */
699 IEEE80211_NODE_STAT(ni, rx_wepfail);
700 goto out;
701 }
702 wh = mtod(m, struct ieee80211_frame *);
703 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
704 has_decrypted = 1;
705 } else {
706 /* XXX M_WEP and IEEE80211_F_PRIVACY */
707 key = NULL;
708 }
709
710 /*
711 * Save QoS bits for use below--before we strip the header.
712 */
713 if (subtype == IEEE80211_FC0_SUBTYPE_QOS)
714 qos = ieee80211_getqos(wh)[0];
715 else
716 qos = 0;
717
718 /*
719 * Next up, any fragmentation.
720 */
721 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
722 m = ieee80211_defrag(ni, m, hdrspace);
723 if (m == NULL) {
724 /* Fragment dropped or frame not complete yet */
725 goto out;
726 }
727 }
728 wh = NULL; /* no longer valid, catch any uses */
729
730 /*
731 * Next strip any MSDU crypto bits.
732 */
733 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
734 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
735 ni->ni_macaddr, "data", "%s", "demic error");
736 vap->iv_stats.is_rx_demicfail++;
737 IEEE80211_NODE_STAT(ni, rx_demicfail);
738 goto out;
739 }
740 /* copy to listener after decrypt */
741 if (ieee80211_radiotap_active_vap(vap))
742 ieee80211_radiotap_rx(vap, m);
743 need_tap = 0;
744 /*
745 * Finally, strip the 802.11 header.
746 */
747 m = ieee80211_decap(vap, m, hdrspace);
748 if (m == NULL) {
749 /* XXX mask bit to check for both */
750 /* don't count Null data frames as errors */
751 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
752 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
753 goto out;
754 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
755 ni->ni_macaddr, "data", "%s", "decap error");
756 vap->iv_stats.is_rx_decap++;
757 IEEE80211_NODE_STAT(ni, rx_decap);
758 goto err;
759 }
760 eh = mtod(m, struct ether_header *);
761 if (!ieee80211_node_is_authorized(ni)) {
762 /*
763 * Deny any non-PAE frames received prior to
764 * authorization. For open/shared-key
765 * authentication the port is mark authorized
766 * after authentication completes. For 802.1x
767 * the port is not marked authorized by the
768 * authenticator until the handshake has completed.
769 */
770 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
771 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
772 eh->ether_shost, "data",
773 "unauthorized port: ether type 0x%x len %u",
774 eh->ether_type, m->m_pkthdr.len);
775 vap->iv_stats.is_rx_unauth++;
776 IEEE80211_NODE_STAT(ni, rx_unauth);
777 goto err;
778 }
779 } else {
780 /*
781 * When denying unencrypted frames, discard
782 * any non-PAE frames received without encryption.
783 */
784 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
785 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
786 (is_hw_decrypted == 0) &&
787 eh->ether_type != htons(ETHERTYPE_PAE)) {
788 /*
789 * Drop unencrypted frames.
790 */
791 vap->iv_stats.is_rx_unencrypted++;
792 IEEE80211_NODE_STAT(ni, rx_unencrypted);
793 goto out;
794 }
795 }
796 /* XXX require HT? */
797 if (qos & IEEE80211_QOS_AMSDU) {
798 m = ieee80211_decap_amsdu(ni, m);
799 if (m == NULL)
800 return IEEE80211_FC0_TYPE_DATA;
801 } else {
802 #ifdef IEEE80211_SUPPORT_SUPERG
803 m = ieee80211_decap_fastframe(vap, ni, m);
804 if (m == NULL)
805 return IEEE80211_FC0_TYPE_DATA;
806 #endif
807 }
808 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
809 ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
810 else
811 hostap_deliver_data(vap, ni, m);
812 return IEEE80211_FC0_TYPE_DATA;
813
814 case IEEE80211_FC0_TYPE_MGT:
815 vap->iv_stats.is_rx_mgmt++;
816 IEEE80211_NODE_STAT(ni, rx_mgmt);
817 if (dir != IEEE80211_FC1_DIR_NODS) {
818 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
819 wh, "mgt", "incorrect dir 0x%x", dir);
820 vap->iv_stats.is_rx_wrongdir++;
821 goto err;
822 }
823 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
824 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
825 ni->ni_macaddr, "mgt", "too short: len %u",
826 m->m_pkthdr.len);
827 vap->iv_stats.is_rx_tooshort++;
828 goto out;
829 }
830 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
831 /* ensure return frames are unicast */
832 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
833 wh, NULL, "source is multicast: %s",
834 ether_sprintf(wh->i_addr2));
835 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */
836 goto out;
837 }
838 #ifdef IEEE80211_DEBUG
839 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
840 ieee80211_msg_dumppkts(vap)) {
841 if_printf(ifp, "received %s from %s rssi %d\n",
842 ieee80211_mgt_subtype_name(subtype),
843 ether_sprintf(wh->i_addr2), rssi);
844 }
845 #endif
846 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
847 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
848 /*
849 * Only shared key auth frames with a challenge
850 * should be encrypted, discard all others.
851 */
852 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
853 wh, NULL,
854 "%s", "WEP set but not permitted");
855 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
856 goto out;
857 }
858 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
859 /*
860 * Discard encrypted frames when privacy is off.
861 */
862 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
863 wh, NULL, "%s", "WEP set but PRIVACY off");
864 vap->iv_stats.is_rx_noprivacy++;
865 goto out;
866 }
867 hdrspace = ieee80211_hdrspace(ic, wh);
868 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
869 /* NB: stats+msgs handled in crypto_decap */
870 goto out;
871 }
872 wh = mtod(m, struct ieee80211_frame *);
873 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
874 has_decrypted = 1;
875 }
876 /*
877 * Pass the packet to radiotap before calling iv_recv_mgmt().
878 * Otherwise iv_recv_mgmt() might pass another packet to
879 * radiotap, resulting in out of order packet captures.
880 */
881 if (ieee80211_radiotap_active_vap(vap))
882 ieee80211_radiotap_rx(vap, m);
883 need_tap = 0;
884 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
885 goto out;
886
887 case IEEE80211_FC0_TYPE_CTL:
888 vap->iv_stats.is_rx_ctl++;
889 IEEE80211_NODE_STAT(ni, rx_ctrl);
890 vap->iv_recv_ctl(ni, m, subtype);
891 goto out;
892 default:
893 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
894 wh, "bad", "frame type 0x%x", type);
895 /* should not come here */
896 break;
897 }
898 err:
899 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
900 out:
901 if (m != NULL) {
902 if (need_tap && ieee80211_radiotap_active_vap(vap))
903 ieee80211_radiotap_rx(vap, m);
904 m_freem(m);
905 }
906 return type;
907 }
908
909 static void
hostap_auth_open(struct ieee80211_node * ni,struct ieee80211_frame * wh,int rssi,int nf,uint16_t seq,uint16_t status)910 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
911 int rssi, int nf, uint16_t seq, uint16_t status)
912 {
913 struct ieee80211vap *vap = ni->ni_vap;
914
915 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
916
917 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
918 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
919 ni->ni_macaddr, "open auth",
920 "bad sta auth mode %u", ni->ni_authmode);
921 vap->iv_stats.is_rx_bad_auth++; /* XXX */
922 /*
923 * Clear any challenge text that may be there if
924 * a previous shared key auth failed and then an
925 * open auth is attempted.
926 */
927 if (ni->ni_challenge != NULL) {
928 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
929 ni->ni_challenge = NULL;
930 }
931 /* XXX hack to workaround calling convention */
932 ieee80211_send_error(ni, wh->i_addr2,
933 IEEE80211_FC0_SUBTYPE_AUTH,
934 (seq + 1) | (IEEE80211_STATUS_ALG<<16));
935 return;
936 }
937 if (seq != IEEE80211_AUTH_OPEN_REQUEST) {
938 vap->iv_stats.is_rx_bad_auth++;
939 return;
940 }
941 /* always accept open authentication requests */
942 if (ni == vap->iv_bss) {
943 ni = ieee80211_dup_bss(vap, wh->i_addr2);
944 if (ni == NULL)
945 return;
946 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
947 (void) ieee80211_ref_node(ni);
948 /*
949 * Mark the node as referenced to reflect that it's
950 * reference count has been bumped to insure it remains
951 * after the transaction completes.
952 */
953 ni->ni_flags |= IEEE80211_NODE_AREF;
954 /*
955 * Mark the node as requiring a valid association id
956 * before outbound traffic is permitted.
957 */
958 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
959
960 if (vap->iv_acl != NULL &&
961 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
962 /*
963 * When the ACL policy is set to RADIUS we defer the
964 * authorization to a user agent. Dispatch an event,
965 * a subsequent MLME call will decide the fate of the
966 * station. If the user agent is not present then the
967 * node will be reclaimed due to inactivity.
968 */
969 IEEE80211_NOTE_MAC(vap,
970 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr,
971 "%s", "station authentication defered (radius acl)");
972 ieee80211_notify_node_auth(ni);
973 } else {
974 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
975 IEEE80211_NOTE_MAC(vap,
976 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr,
977 "%s", "station authenticated (open)");
978 /*
979 * When 802.1x is not in use mark the port
980 * authorized at this point so traffic can flow.
981 */
982 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
983 ieee80211_node_authorize(ni);
984 }
985 }
986
987 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)988 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
989 uint8_t *frm, uint8_t *efrm, int rssi, int nf,
990 uint16_t seq, uint16_t status)
991 {
992 struct ieee80211vap *vap = ni->ni_vap;
993 uint8_t *challenge;
994 int allocbs, estatus;
995
996 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
997
998 /*
999 * NB: this can happen as we allow pre-shared key
1000 * authentication to be enabled w/o wep being turned
1001 * on so that configuration of these can be done
1002 * in any order. It may be better to enforce the
1003 * ordering in which case this check would just be
1004 * for sanity/consistency.
1005 */
1006 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1007 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1008 ni->ni_macaddr, "shared key auth",
1009 "%s", " PRIVACY is disabled");
1010 estatus = IEEE80211_STATUS_ALG;
1011 goto bad;
1012 }
1013 /*
1014 * Pre-shared key authentication is evil; accept
1015 * it only if explicitly configured (it is supported
1016 * mainly for compatibility with clients like Mac OS X).
1017 */
1018 if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1019 ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1020 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1021 ni->ni_macaddr, "shared key auth",
1022 "bad sta auth mode %u", ni->ni_authmode);
1023 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1024 estatus = IEEE80211_STATUS_ALG;
1025 goto bad;
1026 }
1027
1028 challenge = NULL;
1029 if (frm + 1 < efrm) {
1030 if ((frm[1] + 2) > (efrm - frm)) {
1031 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1032 ni->ni_macaddr, "shared key auth",
1033 "ie %d/%d too long",
1034 frm[0], (frm[1] + 2) - (efrm - frm));
1035 vap->iv_stats.is_rx_bad_auth++;
1036 estatus = IEEE80211_STATUS_CHALLENGE;
1037 goto bad;
1038 }
1039 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1040 challenge = frm;
1041 frm += frm[1] + 2;
1042 }
1043 switch (seq) {
1044 case IEEE80211_AUTH_SHARED_CHALLENGE:
1045 case IEEE80211_AUTH_SHARED_RESPONSE:
1046 if (challenge == NULL) {
1047 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1048 ni->ni_macaddr, "shared key auth",
1049 "%s", "no challenge");
1050 vap->iv_stats.is_rx_bad_auth++;
1051 estatus = IEEE80211_STATUS_CHALLENGE;
1052 goto bad;
1053 }
1054 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1055 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1056 ni->ni_macaddr, "shared key auth",
1057 "bad challenge len %d", challenge[1]);
1058 vap->iv_stats.is_rx_bad_auth++;
1059 estatus = IEEE80211_STATUS_CHALLENGE;
1060 goto bad;
1061 }
1062 default:
1063 break;
1064 }
1065 switch (seq) {
1066 case IEEE80211_AUTH_SHARED_REQUEST:
1067 if (ni == vap->iv_bss) {
1068 ni = ieee80211_dup_bss(vap, wh->i_addr2);
1069 if (ni == NULL) {
1070 /* NB: no way to return an error */
1071 return;
1072 }
1073 allocbs = 1;
1074 } else {
1075 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
1076 (void) ieee80211_ref_node(ni);
1077 allocbs = 0;
1078 }
1079 /*
1080 * Mark the node as referenced to reflect that it's
1081 * reference count has been bumped to insure it remains
1082 * after the transaction completes.
1083 */
1084 ni->ni_flags |= IEEE80211_NODE_AREF;
1085 /*
1086 * Mark the node as requiring a valid association id
1087 * before outbound traffic is permitted.
1088 */
1089 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
1090 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
1091 ni->ni_noise = nf;
1092 if (!ieee80211_alloc_challenge(ni)) {
1093 /* NB: don't return error so they rexmit */
1094 return;
1095 }
1096 get_random_bytes(ni->ni_challenge,
1097 IEEE80211_CHALLENGE_LEN);
1098 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1099 ni, "shared key %sauth request", allocbs ? "" : "re");
1100 /*
1101 * When the ACL policy is set to RADIUS we defer the
1102 * authorization to a user agent. Dispatch an event,
1103 * a subsequent MLME call will decide the fate of the
1104 * station. If the user agent is not present then the
1105 * node will be reclaimed due to inactivity.
1106 */
1107 if (vap->iv_acl != NULL &&
1108 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
1109 IEEE80211_NOTE_MAC(vap,
1110 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL,
1111 ni->ni_macaddr,
1112 "%s", "station authentication defered (radius acl)");
1113 ieee80211_notify_node_auth(ni);
1114 return;
1115 }
1116 break;
1117 case IEEE80211_AUTH_SHARED_RESPONSE:
1118 if (ni == vap->iv_bss) {
1119 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1120 ni->ni_macaddr, "shared key response",
1121 "%s", "unknown station");
1122 /* NB: don't send a response */
1123 return;
1124 }
1125 if (ni->ni_challenge == NULL) {
1126 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1127 ni->ni_macaddr, "shared key response",
1128 "%s", "no challenge recorded");
1129 vap->iv_stats.is_rx_bad_auth++;
1130 estatus = IEEE80211_STATUS_CHALLENGE;
1131 goto bad;
1132 }
1133 if (memcmp(ni->ni_challenge, &challenge[2],
1134 challenge[1]) != 0) {
1135 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1136 ni->ni_macaddr, "shared key response",
1137 "%s", "challenge mismatch");
1138 vap->iv_stats.is_rx_auth_fail++;
1139 estatus = IEEE80211_STATUS_CHALLENGE;
1140 goto bad;
1141 }
1142 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1143 ni, "%s", "station authenticated (shared key)");
1144 ieee80211_node_authorize(ni);
1145 break;
1146 default:
1147 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1148 ni->ni_macaddr, "shared key auth",
1149 "bad seq %d", seq);
1150 vap->iv_stats.is_rx_bad_auth++;
1151 estatus = IEEE80211_STATUS_SEQUENCE;
1152 goto bad;
1153 }
1154 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1155 return;
1156 bad:
1157 /*
1158 * Send an error response; but only when operating as an AP.
1159 */
1160 /* XXX hack to workaround calling convention */
1161 ieee80211_send_error(ni, wh->i_addr2,
1162 IEEE80211_FC0_SUBTYPE_AUTH,
1163 (seq + 1) | (estatus<<16));
1164 }
1165
1166 /*
1167 * Convert a WPA cipher selector OUI to an internal
1168 * cipher algorithm. Where appropriate we also
1169 * record any key length.
1170 */
1171 static int
wpa_cipher(const uint8_t * sel,uint8_t * keylen,uint8_t * cipher)1172 wpa_cipher(const uint8_t *sel, uint8_t *keylen, uint8_t *cipher)
1173 {
1174 #define WPA_SEL(x) (((x)<<24)|WPA_OUI)
1175 uint32_t w = le32dec(sel);
1176
1177 switch (w) {
1178 case WPA_SEL(WPA_CSE_NULL):
1179 *cipher = IEEE80211_CIPHER_NONE;
1180 break;
1181 case WPA_SEL(WPA_CSE_WEP40):
1182 if (keylen)
1183 *keylen = 40 / NBBY;
1184 *cipher = IEEE80211_CIPHER_WEP;
1185 break;
1186 case WPA_SEL(WPA_CSE_WEP104):
1187 if (keylen)
1188 *keylen = 104 / NBBY;
1189 *cipher = IEEE80211_CIPHER_WEP;
1190 break;
1191 case WPA_SEL(WPA_CSE_TKIP):
1192 *cipher = IEEE80211_CIPHER_TKIP;
1193 break;
1194 case WPA_SEL(WPA_CSE_CCMP):
1195 *cipher = IEEE80211_CIPHER_AES_CCM;
1196 break;
1197 default:
1198 return (EINVAL);
1199 }
1200
1201 return (0);
1202 #undef WPA_SEL
1203 }
1204
1205 /*
1206 * Convert a WPA key management/authentication algorithm
1207 * to an internal code.
1208 */
1209 static int
wpa_keymgmt(const uint8_t * sel)1210 wpa_keymgmt(const uint8_t *sel)
1211 {
1212 #define WPA_SEL(x) (((x)<<24)|WPA_OUI)
1213 uint32_t w = le32dec(sel);
1214
1215 switch (w) {
1216 case WPA_SEL(WPA_ASE_8021X_UNSPEC):
1217 return WPA_ASE_8021X_UNSPEC;
1218 case WPA_SEL(WPA_ASE_8021X_PSK):
1219 return WPA_ASE_8021X_PSK;
1220 case WPA_SEL(WPA_ASE_NONE):
1221 return WPA_ASE_NONE;
1222 }
1223 return 0; /* NB: so is discarded */
1224 #undef WPA_SEL
1225 }
1226
1227 /*
1228 * Parse a WPA information element to collect parameters.
1229 * Note that we do not validate security parameters; that
1230 * is handled by the authenticator; the parsing done here
1231 * is just for internal use in making operational decisions.
1232 */
1233 static int
ieee80211_parse_wpa(struct ieee80211vap * vap,const uint8_t * frm,struct ieee80211_rsnparms * rsn,const struct ieee80211_frame * wh)1234 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm,
1235 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1236 {
1237 uint8_t len = frm[1];
1238 uint32_t w;
1239 int error, n;
1240
1241 /*
1242 * Check the length once for fixed parts: OUI, type,
1243 * version, mcast cipher, and 2 selector counts.
1244 * Other, variable-length data, must be checked separately.
1245 */
1246 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) {
1247 IEEE80211_DISCARD_IE(vap,
1248 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1249 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags);
1250 return IEEE80211_REASON_IE_INVALID;
1251 }
1252 if (len < 14) {
1253 IEEE80211_DISCARD_IE(vap,
1254 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1255 wh, "WPA", "too short, len %u", len);
1256 return IEEE80211_REASON_IE_INVALID;
1257 }
1258 frm += 6, len -= 4; /* NB: len is payload only */
1259 /* NB: iswpaoui already validated the OUI and type */
1260 w = le16dec(frm);
1261 if (w != WPA_VERSION) {
1262 IEEE80211_DISCARD_IE(vap,
1263 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1264 wh, "WPA", "bad version %u", w);
1265 return IEEE80211_REASON_IE_INVALID;
1266 }
1267 frm += 2, len -= 2;
1268
1269 memset(rsn, 0, sizeof(*rsn));
1270
1271 /* multicast/group cipher */
1272 error = wpa_cipher(frm, &rsn->rsn_mcastkeylen, &rsn->rsn_mcastcipher);
1273 if (error != 0) {
1274 IEEE80211_DISCARD_IE(vap,
1275 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1276 wh, "WPA", "unknown mcast cipher suite %08X",
1277 le32dec(frm));
1278 return IEEE80211_REASON_GROUP_CIPHER_INVALID;
1279 }
1280 frm += 4, len -= 4;
1281
1282 /* unicast ciphers */
1283 n = le16dec(frm);
1284 frm += 2, len -= 2;
1285 if (len < n*4+2) {
1286 IEEE80211_DISCARD_IE(vap,
1287 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1288 wh, "WPA", "ucast cipher data too short; len %u, n %u",
1289 len, n);
1290 return IEEE80211_REASON_IE_INVALID;
1291 }
1292 w = 0;
1293 for (; n > 0; n--) {
1294 uint8_t cipher;
1295
1296 error = wpa_cipher(frm, &rsn->rsn_ucastkeylen, &cipher);
1297 if (error == 0)
1298 w |= 1 << cipher;
1299
1300 frm += 4, len -= 4;
1301 }
1302 if (w == 0) {
1303 IEEE80211_DISCARD_IE(vap,
1304 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1305 wh, "WPA", "no usable pairwise cipher suite found (w=%d)",
1306 w);
1307 return IEEE80211_REASON_PAIRWISE_CIPHER_INVALID;
1308 }
1309 /* XXX other? */
1310 if (w & (1 << IEEE80211_CIPHER_AES_CCM))
1311 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1312 else
1313 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1314
1315 /* key management algorithms */
1316 n = le16dec(frm);
1317 frm += 2, len -= 2;
1318 if (len < n*4) {
1319 IEEE80211_DISCARD_IE(vap,
1320 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1321 wh, "WPA", "key mgmt alg data too short; len %u, n %u",
1322 len, n);
1323 return IEEE80211_REASON_IE_INVALID;
1324 }
1325 w = 0;
1326 for (; n > 0; n--) {
1327 w |= wpa_keymgmt(frm);
1328 frm += 4, len -= 4;
1329 }
1330 if (w & WPA_ASE_8021X_UNSPEC)
1331 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC;
1332 else
1333 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
1334
1335 if (len > 2) /* optional capabilities */
1336 rsn->rsn_caps = le16dec(frm);
1337
1338 return 0;
1339 }
1340
1341 /*
1342 * Convert an RSN cipher selector OUI to an internal
1343 * cipher algorithm. Where appropriate we also
1344 * record any key length.
1345 */
1346 static int
rsn_cipher(const uint8_t * sel,uint8_t * keylen,uint8_t * cipher)1347 rsn_cipher(const uint8_t *sel, uint8_t *keylen, uint8_t *cipher)
1348 {
1349 #define RSN_SEL(x) (((x)<<24)|RSN_OUI)
1350 uint32_t w = le32dec(sel);
1351
1352 switch (w) {
1353 case RSN_SEL(RSN_CSE_NULL):
1354 *cipher = IEEE80211_CIPHER_NONE;
1355 break;
1356 case RSN_SEL(RSN_CSE_WEP40):
1357 if (keylen)
1358 *keylen = 40 / NBBY;
1359 *cipher = IEEE80211_CIPHER_WEP;
1360 break;
1361 case RSN_SEL(RSN_CSE_WEP104):
1362 if (keylen)
1363 *keylen = 104 / NBBY;
1364 *cipher = IEEE80211_CIPHER_WEP;
1365 break;
1366 case RSN_SEL(RSN_CSE_TKIP):
1367 *cipher = IEEE80211_CIPHER_TKIP;
1368 break;
1369 case RSN_SEL(RSN_CSE_CCMP):
1370 *cipher = IEEE80211_CIPHER_AES_CCM;
1371 break;
1372 case RSN_SEL(RSN_CSE_WRAP):
1373 *cipher = IEEE80211_CIPHER_AES_OCB;
1374 break;
1375 default:
1376 return (EINVAL);
1377 }
1378
1379 return (0);
1380 #undef WPA_SEL
1381 }
1382
1383 /*
1384 * Convert an RSN key management/authentication algorithm
1385 * to an internal code.
1386 */
1387 static int
rsn_keymgmt(const uint8_t * sel)1388 rsn_keymgmt(const uint8_t *sel)
1389 {
1390 #define RSN_SEL(x) (((x)<<24)|RSN_OUI)
1391 uint32_t w = le32dec(sel);
1392
1393 switch (w) {
1394 case RSN_SEL(RSN_ASE_8021X_UNSPEC):
1395 return RSN_ASE_8021X_UNSPEC;
1396 case RSN_SEL(RSN_ASE_8021X_PSK):
1397 return RSN_ASE_8021X_PSK;
1398 case RSN_SEL(RSN_ASE_NONE):
1399 return RSN_ASE_NONE;
1400 }
1401 return 0; /* NB: so is discarded */
1402 #undef RSN_SEL
1403 }
1404
1405 /*
1406 * Parse a WPA/RSN information element to collect parameters
1407 * and validate the parameters against what has been
1408 * configured for the system.
1409 */
1410 static int
ieee80211_parse_rsn(struct ieee80211vap * vap,const uint8_t * frm,struct ieee80211_rsnparms * rsn,const struct ieee80211_frame * wh)1411 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm,
1412 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1413 {
1414 uint8_t len = frm[1];
1415 uint32_t w;
1416 int error, n;
1417
1418 /*
1419 * Check the length once for fixed parts:
1420 * version, mcast cipher, and 2 selector counts.
1421 * Other, variable-length data, must be checked separately.
1422 */
1423 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) {
1424 IEEE80211_DISCARD_IE(vap,
1425 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1426 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags);
1427 return IEEE80211_REASON_IE_INVALID;
1428 }
1429 /* XXX may be shorter */
1430 if (len < 10) {
1431 IEEE80211_DISCARD_IE(vap,
1432 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1433 wh, "RSN", "too short, len %u", len);
1434 return IEEE80211_REASON_IE_INVALID;
1435 }
1436 frm += 2;
1437 w = le16dec(frm);
1438 if (w != RSN_VERSION) {
1439 IEEE80211_DISCARD_IE(vap,
1440 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1441 wh, "RSN", "bad version %u", w);
1442 return IEEE80211_REASON_UNSUPP_RSN_IE_VERSION;
1443 }
1444 frm += 2, len -= 2;
1445
1446 memset(rsn, 0, sizeof(*rsn));
1447
1448 /* multicast/group cipher */
1449 error = rsn_cipher(frm, &rsn->rsn_mcastkeylen, &rsn->rsn_mcastcipher);
1450 if (error != 0) {
1451 IEEE80211_DISCARD_IE(vap,
1452 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1453 wh, "RSN", "unknown mcast cipher suite %08X",
1454 le32dec(frm));
1455 return IEEE80211_REASON_GROUP_CIPHER_INVALID;
1456 }
1457 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_NONE) {
1458 IEEE80211_DISCARD_IE(vap,
1459 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1460 wh, "RSN", "invalid mcast cipher suite %d",
1461 rsn->rsn_mcastcipher);
1462 return IEEE80211_REASON_GROUP_CIPHER_INVALID;
1463 }
1464 frm += 4, len -= 4;
1465
1466 /* unicast ciphers */
1467 n = le16dec(frm);
1468 frm += 2, len -= 2;
1469 if (len < n*4+2) {
1470 IEEE80211_DISCARD_IE(vap,
1471 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1472 wh, "RSN", "ucast cipher data too short; len %u, n %u",
1473 len, n);
1474 return IEEE80211_REASON_IE_INVALID;
1475 }
1476 w = 0;
1477
1478 for (; n > 0; n--) {
1479 uint8_t cipher;
1480
1481 error = rsn_cipher(frm, &rsn->rsn_ucastkeylen, &cipher);
1482 if (error == 0)
1483 w |= 1 << cipher;
1484
1485 frm += 4, len -= 4;
1486 }
1487 if (w & (1 << IEEE80211_CIPHER_AES_CCM))
1488 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1489 else if (w & (1 << IEEE80211_CIPHER_AES_OCB))
1490 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_OCB;
1491 else if (w & (1 << IEEE80211_CIPHER_TKIP))
1492 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1493 else if ((w & (1 << IEEE80211_CIPHER_NONE)) &&
1494 (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP ||
1495 rsn->rsn_mcastcipher == IEEE80211_CIPHER_TKIP))
1496 rsn->rsn_ucastcipher = IEEE80211_CIPHER_NONE;
1497 else {
1498 IEEE80211_DISCARD_IE(vap,
1499 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1500 wh, "RSN", "no usable pairwise cipher suite found (w=%d)",
1501 w);
1502 return IEEE80211_REASON_PAIRWISE_CIPHER_INVALID;
1503 }
1504
1505 /* key management algorithms */
1506 n = le16dec(frm);
1507 frm += 2, len -= 2;
1508 if (len < n*4) {
1509 IEEE80211_DISCARD_IE(vap,
1510 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1511 wh, "RSN", "key mgmt alg data too short; len %u, n %u",
1512 len, n);
1513 return IEEE80211_REASON_IE_INVALID;
1514 }
1515 w = 0;
1516 for (; n > 0; n--) {
1517 w |= rsn_keymgmt(frm);
1518 frm += 4, len -= 4;
1519 }
1520 if (w & RSN_ASE_8021X_UNSPEC)
1521 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC;
1522 else
1523 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK;
1524
1525 /* optional RSN capabilities */
1526 if (len > 2)
1527 rsn->rsn_caps = le16dec(frm);
1528 /* XXXPMKID */
1529
1530 return 0;
1531 }
1532
1533 /*
1534 * WPA/802.11i association request processing.
1535 */
1536 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)1537 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms,
1538 const struct ieee80211_frame *wh, const uint8_t *wpa,
1539 const uint8_t *rsn, uint16_t capinfo)
1540 {
1541 struct ieee80211vap *vap = ni->ni_vap;
1542 uint8_t reason;
1543 int badwparsn;
1544
1545 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN);
1546 if (wpa == NULL && rsn == NULL) {
1547 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) {
1548 /*
1549 * W-Fi Protected Setup (WPS) permits
1550 * clients to associate and pass EAPOL frames
1551 * to establish initial credentials.
1552 */
1553 ni->ni_flags |= IEEE80211_NODE_WPS;
1554 return 1;
1555 }
1556 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) &&
1557 (capinfo & IEEE80211_CAPINFO_PRIVACY)) {
1558 /*
1559 * Transitional Security Network. Permits clients
1560 * to associate and use WEP while WPA is configured.
1561 */
1562 ni->ni_flags |= IEEE80211_NODE_TSN;
1563 return 1;
1564 }
1565 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1566 wh, NULL, "%s", "no WPA/RSN IE in association request");
1567 vap->iv_stats.is_rx_assoc_badwpaie++;
1568 reason = IEEE80211_REASON_IE_INVALID;
1569 goto bad;
1570 }
1571 /* assert right association security credentials */
1572 badwparsn = 0; /* NB: to silence compiler */
1573 switch (vap->iv_flags & IEEE80211_F_WPA) {
1574 case IEEE80211_F_WPA1:
1575 badwparsn = (wpa == NULL);
1576 break;
1577 case IEEE80211_F_WPA2:
1578 badwparsn = (rsn == NULL);
1579 break;
1580 case IEEE80211_F_WPA1|IEEE80211_F_WPA2:
1581 badwparsn = (wpa == NULL && rsn == NULL);
1582 break;
1583 }
1584 if (badwparsn) {
1585 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1586 wh, NULL,
1587 "%s", "missing WPA/RSN IE in association request");
1588 vap->iv_stats.is_rx_assoc_badwpaie++;
1589 reason = IEEE80211_REASON_IE_INVALID;
1590 goto bad;
1591 }
1592 /*
1593 * Parse WPA/RSN information element.
1594 */
1595 if (wpa != NULL)
1596 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh);
1597 else
1598 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh);
1599 if (reason != 0) {
1600 /* XXX wpa->rsn fallback? */
1601 /* XXX distinguish WPA/RSN? */
1602 vap->iv_stats.is_rx_assoc_badwpaie++;
1603 goto bad;
1604 }
1605 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni,
1606 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x",
1607 wpa != NULL ? "WPA" : "RSN",
1608 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen,
1609 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen,
1610 rsnparms->rsn_keymgmt, rsnparms->rsn_caps);
1611
1612 return 1;
1613 bad:
1614 ieee80211_node_deauth(ni, reason);
1615 return 0;
1616 }
1617
1618 /* XXX find a better place for definition */
1619 struct l2_update_frame {
1620 struct ether_header eh;
1621 uint8_t dsap;
1622 uint8_t ssap;
1623 uint8_t control;
1624 uint8_t xid[3];
1625 } __packed;
1626
1627 /*
1628 * Deliver a TGf L2UF frame on behalf of a station.
1629 * This primes any bridge when the station is roaming
1630 * between ap's on the same wired network.
1631 */
1632 static void
ieee80211_deliver_l2uf(struct ieee80211_node * ni)1633 ieee80211_deliver_l2uf(struct ieee80211_node *ni)
1634 {
1635 struct ieee80211vap *vap = ni->ni_vap;
1636 struct ifnet *ifp = vap->iv_ifp;
1637 struct mbuf *m;
1638 struct l2_update_frame *l2uf;
1639 struct ether_header *eh;
1640
1641 m = m_gethdr(M_NOWAIT, MT_DATA);
1642 if (m == NULL) {
1643 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1644 "%s", "no mbuf for l2uf frame");
1645 vap->iv_stats.is_rx_nobuf++; /* XXX not right */
1646 return;
1647 }
1648 l2uf = mtod(m, struct l2_update_frame *);
1649 eh = &l2uf->eh;
1650 /* dst: Broadcast address */
1651 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr);
1652 /* src: associated STA */
1653 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr);
1654 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh));
1655
1656 l2uf->dsap = 0;
1657 l2uf->ssap = 0;
1658 l2uf->control = 0xf5;
1659 l2uf->xid[0] = 0x81;
1660 l2uf->xid[1] = 0x80;
1661 l2uf->xid[2] = 0x00;
1662
1663 m->m_pkthdr.len = m->m_len = sizeof(*l2uf);
1664 hostap_deliver_data(vap, ni, m);
1665 }
1666
1667 static void
ratesetmismatch(struct ieee80211_node * ni,const struct ieee80211_frame * wh,int reassoc,int resp,const char * tag,int rate)1668 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1669 int reassoc, int resp, const char *tag, int rate)
1670 {
1671 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1672 "deny %s request, %s rate set mismatch, rate/MCS %d",
1673 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL);
1674 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE);
1675 ieee80211_node_leave(ni);
1676 }
1677
1678 static void
capinfomismatch(struct ieee80211_node * ni,const struct ieee80211_frame * wh,int reassoc,int resp,const char * tag,int capinfo)1679 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1680 int reassoc, int resp, const char *tag, int capinfo)
1681 {
1682 struct ieee80211vap *vap = ni->ni_vap;
1683
1684 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1685 "deny %s request, %s mismatch 0x%x",
1686 reassoc ? "reassoc" : "assoc", tag, capinfo);
1687 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO);
1688 ieee80211_node_leave(ni);
1689 vap->iv_stats.is_rx_assoc_capmismatch++;
1690 }
1691
1692 static void
htcapmismatch(struct ieee80211_node * ni,const struct ieee80211_frame * wh,int reassoc,int resp)1693 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1694 int reassoc, int resp)
1695 {
1696 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1697 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc");
1698 /* XXX no better code */
1699 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS);
1700 ieee80211_node_leave(ni);
1701 }
1702
1703 static void
authalgreject(struct ieee80211_node * ni,const struct ieee80211_frame * wh,int algo,int seq,int status)1704 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1705 int algo, int seq, int status)
1706 {
1707 struct ieee80211vap *vap = ni->ni_vap;
1708
1709 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1710 wh, NULL, "unsupported alg %d", algo);
1711 vap->iv_stats.is_rx_auth_unsupported++;
1712 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH,
1713 seq | (status << 16));
1714 }
1715
1716 static __inline int
ishtmixed(const uint8_t * ie)1717 ishtmixed(const uint8_t *ie)
1718 {
1719 const struct ieee80211_ie_htinfo *ht =
1720 (const struct ieee80211_ie_htinfo *) ie;
1721 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) ==
1722 IEEE80211_HTINFO_OPMODE_MIXED;
1723 }
1724
1725 static int
is11bclient(const uint8_t * rates,const uint8_t * xrates)1726 is11bclient(const uint8_t *rates, const uint8_t *xrates)
1727 {
1728 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
1729 int i;
1730
1731 /* NB: the 11b clients we care about will not have xrates */
1732 if (xrates != NULL || rates == NULL)
1733 return 0;
1734 for (i = 0; i < rates[1]; i++) {
1735 int r = rates[2+i] & IEEE80211_RATE_VAL;
1736 if (r > 2*11 || ((1<<r) & brates) == 0)
1737 return 0;
1738 }
1739 return 1;
1740 }
1741
1742 static void
hostap_recv_mgmt(struct ieee80211_node * ni,struct mbuf * m0,int subtype,const struct ieee80211_rx_stats * rxs,int rssi,int nf)1743 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1744 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
1745 {
1746 struct ieee80211vap *vap = ni->ni_vap;
1747 struct ieee80211com *ic = ni->ni_ic;
1748 struct ieee80211_frame *wh;
1749 uint8_t *frm, *efrm, *sfrm;
1750 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap;
1751 uint8_t *vhtcap, *vhtinfo;
1752 int reassoc, resp;
1753 uint8_t rate;
1754
1755 wh = mtod(m0, struct ieee80211_frame *);
1756 frm = (uint8_t *)&wh[1];
1757 efrm = mtod(m0, uint8_t *) + m0->m_len;
1758 switch (subtype) {
1759 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1760 /*
1761 * We process beacon/probe response frames when scanning;
1762 * otherwise we check beacon frames for overlapping non-ERP
1763 * BSS in 11g and/or overlapping legacy BSS when in HT.
1764 */
1765 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
1766 vap->iv_stats.is_rx_mgtdiscard++;
1767 return;
1768 }
1769 /* FALLTHROUGH */
1770 case IEEE80211_FC0_SUBTYPE_BEACON: {
1771 struct ieee80211_scanparams scan;
1772
1773 /* NB: accept off-channel frames */
1774 /* XXX TODO: use rxstatus to determine off-channel details */
1775 if (ieee80211_parse_beacon(ni, m0, ic->ic_curchan, &scan) &~ IEEE80211_BPARSE_OFFCHAN)
1776 return;
1777 /*
1778 * Count frame now that we know it's to be processed.
1779 */
1780 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1781 vap->iv_stats.is_rx_beacon++; /* XXX remove */
1782 IEEE80211_NODE_STAT(ni, rx_beacons);
1783 } else
1784 IEEE80211_NODE_STAT(ni, rx_proberesp);
1785 /*
1786 * If scanning, just pass information to the scan module.
1787 */
1788 if (ic->ic_flags & IEEE80211_F_SCAN) {
1789 if (scan.status == 0 && /* NB: on channel */
1790 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) {
1791 /*
1792 * Actively scanning a channel marked passive;
1793 * send a probe request now that we know there
1794 * is 802.11 traffic present.
1795 *
1796 * XXX check if the beacon we recv'd gives
1797 * us what we need and suppress the probe req
1798 */
1799 ieee80211_probe_curchan(vap, 1);
1800 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1801 }
1802 ieee80211_add_scan(vap, ic->ic_curchan, &scan, wh,
1803 subtype, rssi, nf);
1804 return;
1805 }
1806 /*
1807 * Check beacon for overlapping bss w/ non ERP stations.
1808 * If we detect one and protection is configured but not
1809 * enabled, enable it and start a timer that'll bring us
1810 * out if we stop seeing the bss.
1811 */
1812 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1813 scan.status == 0 && /* NB: on-channel */
1814 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/
1815 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) {
1816 vap->iv_lastnonerp = ticks;
1817 vap->iv_flags_ext |= IEEE80211_FEXT_NONERP_PR;
1818 /*
1819 * XXX TODO: this may need to check all VAPs?
1820 */
1821 if (vap->iv_protmode != IEEE80211_PROT_NONE &&
1822 (vap->iv_flags & IEEE80211_F_USEPROT) == 0) {
1823 IEEE80211_NOTE_FRAME(vap,
1824 IEEE80211_MSG_ASSOC, wh,
1825 "non-ERP present on channel %d "
1826 "(saw erp 0x%x from channel %d), "
1827 "enable use of protection",
1828 ic->ic_curchan->ic_ieee,
1829 scan.erp, scan.chan);
1830 vap->iv_flags |= IEEE80211_F_USEPROT;
1831 ieee80211_vap_update_erp_protmode(vap);
1832 }
1833 }
1834 /*
1835 * Check beacon for non-HT station on HT channel
1836 * and update HT BSS occupancy as appropriate.
1837 */
1838 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) {
1839 if (scan.status & IEEE80211_BPARSE_OFFCHAN) {
1840 /*
1841 * Off control channel; only check frames
1842 * that come in the extension channel when
1843 * operating w/ HT40.
1844 */
1845 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan))
1846 break;
1847 if (scan.chan != ic->ic_curchan->ic_extieee)
1848 break;
1849 }
1850 if (scan.htinfo == NULL) {
1851 ieee80211_htprot_update(vap,
1852 IEEE80211_HTINFO_OPMODE_PROTOPT |
1853 IEEE80211_HTINFO_NONHT_PRESENT);
1854 } else if (ishtmixed(scan.htinfo)) {
1855 /* XXX? take NONHT_PRESENT from beacon? */
1856 ieee80211_htprot_update(vap,
1857 IEEE80211_HTINFO_OPMODE_MIXED |
1858 IEEE80211_HTINFO_NONHT_PRESENT);
1859 }
1860 }
1861 break;
1862 }
1863
1864 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1865 if (vap->iv_state != IEEE80211_S_RUN) {
1866 vap->iv_stats.is_rx_mgtdiscard++;
1867 return;
1868 }
1869 /*
1870 * Consult the ACL policy module if setup.
1871 */
1872 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) {
1873 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1874 wh, NULL, "%s", "disallowed by ACL");
1875 vap->iv_stats.is_rx_acl++;
1876 return;
1877 }
1878 /*
1879 * prreq frame format
1880 * [tlv] ssid
1881 * [tlv] supported rates
1882 * [tlv] extended supported rates
1883 */
1884 ssid = rates = xrates = NULL;
1885 while (efrm - frm > 1) {
1886 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1887 switch (*frm) {
1888 case IEEE80211_ELEMID_SSID:
1889 ssid = frm;
1890 break;
1891 case IEEE80211_ELEMID_RATES:
1892 rates = frm;
1893 break;
1894 case IEEE80211_ELEMID_XRATES:
1895 xrates = frm;
1896 break;
1897 }
1898 frm += frm[1] + 2;
1899 }
1900 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1901 if (xrates != NULL)
1902 IEEE80211_VERIFY_ELEMENT(xrates,
1903 IEEE80211_RATE_MAXSIZE - rates[1], return);
1904 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
1905 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
1906 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
1907 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1908 wh, NULL,
1909 "%s", "no ssid with ssid suppression enabled");
1910 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
1911 return;
1912 }
1913
1914 /* XXX find a better class or define it's own */
1915 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
1916 "%s", "recv probe req");
1917 /*
1918 * Some legacy 11b clients cannot hack a complete
1919 * probe response frame. When the request includes
1920 * only a bare-bones rate set, communicate this to
1921 * the transmit side.
1922 */
1923 ieee80211_send_proberesp(vap, wh->i_addr2,
1924 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
1925 break;
1926
1927 case IEEE80211_FC0_SUBTYPE_AUTH: {
1928 uint16_t algo, seq, status;
1929
1930 if (vap->iv_state != IEEE80211_S_RUN) {
1931 vap->iv_stats.is_rx_mgtdiscard++;
1932 return;
1933 }
1934 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1935 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1936 wh, NULL, "%s", "wrong bssid");
1937 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/
1938 return;
1939 }
1940 /*
1941 * auth frame format
1942 * [2] algorithm
1943 * [2] sequence
1944 * [2] status
1945 * [tlv*] challenge
1946 */
1947 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1948 algo = le16toh(*(uint16_t *)frm);
1949 seq = le16toh(*(uint16_t *)(frm + 2));
1950 status = le16toh(*(uint16_t *)(frm + 4));
1951 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1952 "recv auth frame with algorithm %d seq %d", algo, seq);
1953 /*
1954 * Consult the ACL policy module if setup.
1955 */
1956 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) {
1957 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1958 wh, NULL, "%s", "disallowed by ACL");
1959 vap->iv_stats.is_rx_acl++;
1960 ieee80211_send_error(ni, wh->i_addr2,
1961 IEEE80211_FC0_SUBTYPE_AUTH,
1962 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16));
1963 return;
1964 }
1965 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1966 IEEE80211_DISCARD(vap,
1967 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1968 wh, NULL, "%s", "TKIP countermeasures enabled");
1969 vap->iv_stats.is_rx_auth_countermeasures++;
1970 ieee80211_send_error(ni, wh->i_addr2,
1971 IEEE80211_FC0_SUBTYPE_AUTH,
1972 IEEE80211_REASON_MIC_FAILURE);
1973 return;
1974 }
1975 if (algo == IEEE80211_AUTH_ALG_SHARED)
1976 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1977 seq, status);
1978 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1979 hostap_auth_open(ni, wh, rssi, nf, seq, status);
1980 else if (algo == IEEE80211_AUTH_ALG_LEAP) {
1981 authalgreject(ni, wh, algo,
1982 seq+1, IEEE80211_STATUS_ALG);
1983 return;
1984 } else {
1985 /*
1986 * We assume that an unknown algorithm is the result
1987 * of a decryption failure on a shared key auth frame;
1988 * return a status code appropriate for that instead
1989 * of IEEE80211_STATUS_ALG.
1990 *
1991 * NB: a seq# of 4 is intentional; the decrypted
1992 * frame likely has a bogus seq value.
1993 */
1994 authalgreject(ni, wh, algo,
1995 4, IEEE80211_STATUS_CHALLENGE);
1996 return;
1997 }
1998 break;
1999 }
2000
2001 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
2002 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
2003 uint16_t capinfo, lintval;
2004 struct ieee80211_rsnparms rsnparms;
2005
2006 if (vap->iv_state != IEEE80211_S_RUN) {
2007 vap->iv_stats.is_rx_mgtdiscard++;
2008 return;
2009 }
2010 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
2011 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2012 wh, NULL, "%s", "wrong bssid");
2013 vap->iv_stats.is_rx_assoc_bss++;
2014 return;
2015 }
2016 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
2017 reassoc = 1;
2018 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
2019 } else {
2020 reassoc = 0;
2021 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
2022 }
2023 if (ni == vap->iv_bss) {
2024 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
2025 "deny %s request, sta not authenticated",
2026 reassoc ? "reassoc" : "assoc");
2027 ieee80211_send_error(ni, wh->i_addr2,
2028 IEEE80211_FC0_SUBTYPE_DEAUTH,
2029 IEEE80211_REASON_ASSOC_NOT_AUTHED);
2030 vap->iv_stats.is_rx_assoc_notauth++;
2031 return;
2032 }
2033
2034 /*
2035 * asreq frame format
2036 * [2] capability information
2037 * [2] listen interval
2038 * [6*] current AP address (reassoc only)
2039 * [tlv] ssid
2040 * [tlv] supported rates
2041 * [tlv] extended supported rates
2042 * [tlv] WPA or RSN
2043 * [tlv] HT capabilities
2044 * [tlv] Atheros capabilities
2045 */
2046 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return);
2047 capinfo = le16toh(*(uint16_t *)frm); frm += 2;
2048 lintval = le16toh(*(uint16_t *)frm); frm += 2;
2049 if (reassoc)
2050 frm += 6; /* ignore current AP info */
2051 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL;
2052 vhtcap = vhtinfo = NULL;
2053 sfrm = frm;
2054 while (efrm - frm > 1) {
2055 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
2056 switch (*frm) {
2057 case IEEE80211_ELEMID_SSID:
2058 ssid = frm;
2059 break;
2060 case IEEE80211_ELEMID_RATES:
2061 rates = frm;
2062 break;
2063 case IEEE80211_ELEMID_XRATES:
2064 xrates = frm;
2065 break;
2066 case IEEE80211_ELEMID_RSN:
2067 rsn = frm;
2068 break;
2069 case IEEE80211_ELEMID_HTCAP:
2070 htcap = frm;
2071 break;
2072 case IEEE80211_ELEMID_VHT_CAP:
2073 vhtcap = frm;
2074 break;
2075 case IEEE80211_ELEMID_VHT_OPMODE:
2076 vhtinfo = frm;
2077 break;
2078 case IEEE80211_ELEMID_VENDOR:
2079 if (iswpaoui(frm))
2080 wpa = frm;
2081 else if (iswmeinfo(frm))
2082 wme = frm;
2083 #ifdef IEEE80211_SUPPORT_SUPERG
2084 else if (isatherosoui(frm))
2085 ath = frm;
2086 #endif
2087 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
2088 if (ishtcapoui(frm) && htcap == NULL)
2089 htcap = frm;
2090 }
2091 break;
2092 }
2093 frm += frm[1] + 2;
2094 }
2095 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
2096 if (xrates != NULL)
2097 IEEE80211_VERIFY_ELEMENT(xrates,
2098 IEEE80211_RATE_MAXSIZE - rates[1], return);
2099 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
2100 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
2101 if (htcap != NULL) {
2102 IEEE80211_VERIFY_LENGTH(htcap[1],
2103 htcap[0] == IEEE80211_ELEMID_VENDOR ?
2104 4 + sizeof(struct ieee80211_ie_htcap)-2 :
2105 sizeof(struct ieee80211_ie_htcap)-2,
2106 return); /* XXX just NULL out? */
2107 }
2108
2109 /* Validate VHT IEs */
2110 if (vhtcap != NULL) {
2111 IEEE80211_VERIFY_LENGTH(vhtcap[1],
2112 sizeof(struct ieee80211_ie_vhtcap) - 2,
2113 return);
2114 }
2115 if (vhtinfo != NULL) {
2116 IEEE80211_VERIFY_LENGTH(vhtinfo[1],
2117 sizeof(struct ieee80211_ie_vht_operation) - 2,
2118 return);
2119 }
2120
2121 if ((vap->iv_flags & IEEE80211_F_WPA) &&
2122 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo))
2123 return;
2124 /* discard challenge after association */
2125 if (ni->ni_challenge != NULL) {
2126 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
2127 ni->ni_challenge = NULL;
2128 }
2129 /* NB: 802.11 spec says to ignore station's privacy bit */
2130 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
2131 capinfomismatch(ni, wh, reassoc, resp,
2132 "capability", capinfo);
2133 return;
2134 }
2135 /*
2136 * Disallow re-associate w/ invalid slot time setting.
2137 */
2138 if (ni->ni_associd != 0 &&
2139 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2140 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
2141 capinfomismatch(ni, wh, reassoc, resp,
2142 "slot time", capinfo);
2143 return;
2144 }
2145 rate = ieee80211_setup_rates(ni, rates, xrates,
2146 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
2147 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
2148 if (rate & IEEE80211_RATE_BASIC) {
2149 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate);
2150 vap->iv_stats.is_rx_assoc_norate++;
2151 return;
2152 }
2153 /*
2154 * If constrained to 11g-only stations reject an
2155 * 11b-only station. We cheat a bit here by looking
2156 * at the max negotiated xmit rate and assuming anyone
2157 * with a best rate <24Mb/s is an 11b station.
2158 */
2159 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) {
2160 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate);
2161 vap->iv_stats.is_rx_assoc_norate++;
2162 return;
2163 }
2164
2165 /*
2166 * Do HT rate set handling and setup HT node state.
2167 */
2168 ni->ni_chan = vap->iv_bss->ni_chan;
2169
2170 /* VHT */
2171 if (IEEE80211_IS_CHAN_VHT(ni->ni_chan) &&
2172 vhtcap != NULL &&
2173 vhtinfo != NULL) {
2174 /* XXX TODO; see below */
2175 printf("%s: VHT TODO!\n", __func__);
2176 ieee80211_vht_node_init(ni);
2177 ieee80211_vht_update_cap(ni, vhtcap, vhtinfo);
2178 } else if (ni->ni_flags & IEEE80211_NODE_VHT)
2179 ieee80211_vht_node_cleanup(ni);
2180
2181 /* HT */
2182 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2183 rate = ieee80211_setup_htrates(ni, htcap,
2184 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO |
2185 IEEE80211_F_DOBRS);
2186 if (rate & IEEE80211_RATE_BASIC) {
2187 ratesetmismatch(ni, wh, reassoc, resp,
2188 "HT", rate);
2189 vap->iv_stats.is_ht_assoc_norate++;
2190 return;
2191 }
2192 ieee80211_ht_node_init(ni);
2193 ieee80211_ht_updatehtcap(ni, htcap);
2194 } else if (ni->ni_flags & IEEE80211_NODE_HT)
2195 ieee80211_ht_node_cleanup(ni);
2196
2197 /* Finally - this will use HT/VHT info to change node channel */
2198 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2199 ieee80211_ht_updatehtcap_final(ni);
2200 }
2201
2202 #ifdef IEEE80211_SUPPORT_SUPERG
2203 /* Always do ff node cleanup; for A-MSDU */
2204 ieee80211_ff_node_cleanup(ni);
2205 #endif
2206 /*
2207 * Allow AMPDU operation only with unencrypted traffic
2208 * or AES-CCM; the 11n spec only specifies these ciphers
2209 * so permitting any others is undefined and can lead
2210 * to interoperability problems.
2211 */
2212 if ((ni->ni_flags & IEEE80211_NODE_HT) &&
2213 (((vap->iv_flags & IEEE80211_F_WPA) &&
2214 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) ||
2215 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) {
2216 IEEE80211_NOTE(vap,
2217 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
2218 "disallow HT use because WEP or TKIP requested, "
2219 "capinfo 0x%x ucastcipher %d", capinfo,
2220 rsnparms.rsn_ucastcipher);
2221 ieee80211_ht_node_cleanup(ni);
2222 #ifdef IEEE80211_SUPPORT_SUPERG
2223 /* Always do ff node cleanup; for A-MSDU */
2224 ieee80211_ff_node_cleanup(ni);
2225 #endif
2226 vap->iv_stats.is_ht_assoc_downgrade++;
2227 }
2228 /*
2229 * If constrained to 11n-only stations reject legacy stations.
2230 */
2231 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) &&
2232 (ni->ni_flags & IEEE80211_NODE_HT) == 0) {
2233 htcapmismatch(ni, wh, reassoc, resp);
2234 vap->iv_stats.is_ht_assoc_nohtcap++;
2235 return;
2236 }
2237 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
2238 ni->ni_noise = nf;
2239 ni->ni_intval = lintval;
2240 ni->ni_capinfo = capinfo;
2241 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell;
2242 ni->ni_fhindex = vap->iv_bss->ni_fhindex;
2243 /*
2244 * Store the IEs.
2245 * XXX maybe better to just expand
2246 */
2247 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) {
2248 #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off)
2249 if (wpa != NULL)
2250 setie(wpa_ie, wpa - sfrm);
2251 if (rsn != NULL)
2252 setie(rsn_ie, rsn - sfrm);
2253 if (htcap != NULL)
2254 setie(htcap_ie, htcap - sfrm);
2255 if (wme != NULL) {
2256 setie(wme_ie, wme - sfrm);
2257 /*
2258 * Mark node as capable of QoS.
2259 */
2260 ni->ni_flags |= IEEE80211_NODE_QOS;
2261 if (ieee80211_parse_wmeie(wme, wh, ni) > 0) {
2262 if (ni->ni_uapsd != 0)
2263 ni->ni_flags |=
2264 IEEE80211_NODE_UAPSD;
2265 else
2266 ni->ni_flags &=
2267 ~IEEE80211_NODE_UAPSD;
2268 }
2269 } else
2270 ni->ni_flags &=
2271 ~(IEEE80211_NODE_QOS |
2272 IEEE80211_NODE_UAPSD);
2273 #ifdef IEEE80211_SUPPORT_SUPERG
2274 if (ath != NULL) {
2275 setie(ath_ie, ath - sfrm);
2276 /*
2277 * Parse ATH station parameters.
2278 */
2279 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
2280 } else
2281 #endif
2282 ni->ni_ath_flags = 0;
2283 #undef setie
2284 } else {
2285 ni->ni_flags &= ~IEEE80211_NODE_QOS;
2286 ni->ni_flags &= ~IEEE80211_NODE_UAPSD;
2287 ni->ni_ath_flags = 0;
2288 }
2289 ieee80211_node_join(ni, resp);
2290 ieee80211_deliver_l2uf(ni);
2291 break;
2292 }
2293
2294 case IEEE80211_FC0_SUBTYPE_DEAUTH:
2295 case IEEE80211_FC0_SUBTYPE_DISASSOC: {
2296 uint16_t reason;
2297
2298 if (vap->iv_state != IEEE80211_S_RUN ||
2299 /* NB: can happen when in promiscuous mode */
2300 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
2301 vap->iv_stats.is_rx_mgtdiscard++;
2302 break;
2303 }
2304 /*
2305 * deauth/disassoc frame format
2306 * [2] reason
2307 */
2308 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
2309 reason = le16toh(*(uint16_t *)frm);
2310 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) {
2311 vap->iv_stats.is_rx_deauth++;
2312 IEEE80211_NODE_STAT(ni, rx_deauth);
2313 } else {
2314 vap->iv_stats.is_rx_disassoc++;
2315 IEEE80211_NODE_STAT(ni, rx_disassoc);
2316 }
2317 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2318 "recv %s (reason: %d (%s))",
2319 ieee80211_mgt_subtype_name(subtype),
2320 reason, ieee80211_reason_to_string(reason));
2321 if (ni != vap->iv_bss)
2322 ieee80211_node_leave(ni);
2323 break;
2324 }
2325
2326 case IEEE80211_FC0_SUBTYPE_ACTION:
2327 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
2328 if (ni == vap->iv_bss) {
2329 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2330 wh, NULL, "%s", "unknown node");
2331 vap->iv_stats.is_rx_mgtdiscard++;
2332 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
2333 !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
2334 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2335 wh, NULL, "%s", "not for us");
2336 vap->iv_stats.is_rx_mgtdiscard++;
2337 } else if (vap->iv_state != IEEE80211_S_RUN) {
2338 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2339 wh, NULL, "wrong state %s",
2340 ieee80211_state_name[vap->iv_state]);
2341 vap->iv_stats.is_rx_mgtdiscard++;
2342 } else {
2343 if (ieee80211_parse_action(ni, m0) == 0)
2344 (void)ic->ic_recv_action(ni, wh, frm, efrm);
2345 }
2346 break;
2347
2348 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2349 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2350 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
2351 case IEEE80211_FC0_SUBTYPE_ATIM:
2352 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2353 wh, NULL, "%s", "not handled");
2354 vap->iv_stats.is_rx_mgtdiscard++;
2355 break;
2356
2357 default:
2358 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2359 wh, "mgt", "subtype 0x%x not handled", subtype);
2360 vap->iv_stats.is_rx_badsubtype++;
2361 break;
2362 }
2363 }
2364
2365 static void
hostap_recv_ctl(struct ieee80211_node * ni,struct mbuf * m,int subtype)2366 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
2367 {
2368 switch (subtype) {
2369 case IEEE80211_FC0_SUBTYPE_PS_POLL:
2370 ni->ni_vap->iv_recv_pspoll(ni, m);
2371 break;
2372 case IEEE80211_FC0_SUBTYPE_BAR:
2373 ieee80211_recv_bar(ni, m);
2374 break;
2375 }
2376 }
2377
2378 /*
2379 * Process a received ps-poll frame.
2380 */
2381 void
ieee80211_recv_pspoll(struct ieee80211_node * ni,struct mbuf * m0)2382 ieee80211_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
2383 {
2384 struct ieee80211vap *vap = ni->ni_vap;
2385 struct ieee80211com *ic = vap->iv_ic;
2386 struct ieee80211_frame_min *wh;
2387 struct mbuf *m;
2388 uint16_t aid;
2389 int qlen;
2390
2391 wh = mtod(m0, struct ieee80211_frame_min *);
2392 if (ni->ni_associd == 0) {
2393 IEEE80211_DISCARD(vap,
2394 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2395 (struct ieee80211_frame *) wh, NULL,
2396 "%s", "unassociated station");
2397 vap->iv_stats.is_ps_unassoc++;
2398 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
2399 IEEE80211_REASON_NOT_ASSOCED);
2400 return;
2401 }
2402
2403 aid = le16toh(*(uint16_t *)wh->i_dur);
2404 if (aid != ni->ni_associd) {
2405 IEEE80211_DISCARD(vap,
2406 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2407 (struct ieee80211_frame *) wh, NULL,
2408 "aid mismatch: sta aid 0x%x poll aid 0x%x",
2409 ni->ni_associd, aid);
2410 vap->iv_stats.is_ps_badaid++;
2411 /*
2412 * NB: We used to deauth the station but it turns out
2413 * the Blackberry Curve 8230 (and perhaps other devices)
2414 * sometimes send the wrong AID when WME is negotiated.
2415 * Being more lenient here seems ok as we already check
2416 * the station is associated and we only return frames
2417 * queued for the station (i.e. we don't use the AID).
2418 */
2419 return;
2420 }
2421
2422 /* Okay, take the first queued packet and put it out... */
2423 m = ieee80211_node_psq_dequeue(ni, &qlen);
2424 if (m == NULL) {
2425 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2,
2426 "%s", "recv ps-poll, but queue empty");
2427 ieee80211_send_nulldata(ieee80211_ref_node(ni));
2428 vap->iv_stats.is_ps_qempty++; /* XXX node stat */
2429 if (vap->iv_set_tim != NULL)
2430 vap->iv_set_tim(ni, 0); /* just in case */
2431 return;
2432 }
2433 /*
2434 * If there are more packets, set the more packets bit
2435 * in the packet dispatched to the station; otherwise
2436 * turn off the TIM bit.
2437 */
2438 if (qlen != 0) {
2439 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2440 "recv ps-poll, send packet, %u still queued", qlen);
2441 m->m_flags |= M_MORE_DATA;
2442 } else {
2443 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2444 "%s", "recv ps-poll, send packet, queue empty");
2445 if (vap->iv_set_tim != NULL)
2446 vap->iv_set_tim(ni, 0);
2447 }
2448 m->m_flags |= M_PWR_SAV; /* bypass PS handling */
2449
2450 /*
2451 * Do the right thing; if it's an encap'ed frame then
2452 * call ieee80211_parent_xmitpkt() else
2453 * call ieee80211_vap_xmitpkt().
2454 */
2455 if (m->m_flags & M_ENCAP) {
2456 (void) ieee80211_parent_xmitpkt(ic, m);
2457 } else {
2458 (void) ieee80211_vap_xmitpkt(vap, m);
2459 }
2460 }
2461