1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2007-2009 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 IBSS 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_adhoc.h>
62 #include <net80211/ieee80211_input.h>
63 #ifdef IEEE80211_SUPPORT_SUPERG
64 #include <net80211/ieee80211_superg.h>
65 #endif
66 #ifdef IEEE80211_SUPPORT_TDMA
67 #include <net80211/ieee80211_tdma.h>
68 #endif
69 #include <net80211/ieee80211_sta.h>
70
71 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2)
72
73 static void adhoc_vattach(struct ieee80211vap *);
74 static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int);
75 static int adhoc_input(struct ieee80211_node *, struct mbuf *,
76 const struct ieee80211_rx_stats *, int, int);
77 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *,
78 int subtype, const struct ieee80211_rx_stats *, int, int);
79 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *,
80 int subtype, const struct ieee80211_rx_stats *rxs, int, int);
81 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
82
83 void
84 ieee80211_adhoc_attach(struct ieee80211com *ic)
85 {
86 ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach;
87 ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach;
88 }
89
90 void
91 ieee80211_adhoc_detach(struct ieee80211com *ic)
92 {
93 }
94
95 static void
96 adhoc_vdetach(struct ieee80211vap *vap)
97 {
98 }
99
100 static void
101 adhoc_vattach(struct ieee80211vap *vap)
102 {
103 vap->iv_newstate = adhoc_newstate;
104 vap->iv_input = adhoc_input;
105 if (vap->iv_opmode == IEEE80211_M_IBSS)
106 vap->iv_recv_mgmt = adhoc_recv_mgmt;
107 else
108 vap->iv_recv_mgmt = ahdemo_recv_mgmt;
109 vap->iv_recv_ctl = adhoc_recv_ctl;
110 vap->iv_opdetach = adhoc_vdetach;
111 #ifdef IEEE80211_SUPPORT_TDMA
112 /*
113 * Throw control to tdma support. Note we do this
114 * after setting up our callbacks so it can piggyback
115 * on top of us.
116 */
117 if (vap->iv_caps & IEEE80211_C_TDMA)
118 ieee80211_tdma_vattach(vap);
119 #endif
120 }
121
122 static void
123 sta_leave(void *arg, struct ieee80211_node *ni)
124 {
125 struct ieee80211vap *vap = ni->ni_vap;
126
127 if (ni != vap->iv_bss)
128 ieee80211_node_leave(ni);
129 }
130
131 /*
132 * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler.
133 */
134 static int
135 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
136 {
137 struct ieee80211com *ic = vap->iv_ic;
138 struct ieee80211_node *ni;
139 enum ieee80211_state ostate;
140
141 IEEE80211_LOCK_ASSERT(vap->iv_ic);
142
143 ostate = vap->iv_state;
144 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
145 __func__, ieee80211_state_name[ostate],
146 ieee80211_state_name[nstate], arg);
147 vap->iv_state = nstate; /* state transition */
148 if (ostate != IEEE80211_S_SCAN)
149 ieee80211_cancel_scan(vap); /* background scan */
150 ni = vap->iv_bss; /* NB: no reference held */
151 switch (nstate) {
152 case IEEE80211_S_INIT:
153 switch (ostate) {
154 case IEEE80211_S_SCAN:
155 ieee80211_cancel_scan(vap);
156 break;
157 default:
158 break;
159 }
160 if (ostate != IEEE80211_S_INIT) {
161 /* NB: optimize INIT -> INIT case */
162 ieee80211_reset_bss(vap);
163 }
164 break;
165 case IEEE80211_S_SCAN:
166 switch (ostate) {
167 case IEEE80211_S_RUN: /* beacon miss */
168 /* purge station table; entries are stale */
169 ieee80211_iterate_nodes_vap(&ic->ic_sta, vap,
170 sta_leave, NULL);
171 /* fall thru... */
172 case IEEE80211_S_INIT:
173 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
174 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
175 /*
176 * Already have a channel; bypass the
177 * scan and startup immediately.
178 */
179 ieee80211_create_ibss(vap,
180 ieee80211_ht_adjust_channel(ic,
181 vap->iv_des_chan, vap->iv_flags_ht));
182 break;
183 }
184 /*
185 * Initiate a scan. We can come here as a result
186 * of an IEEE80211_IOC_SCAN_REQ too in which case
187 * the vap will be marked with IEEE80211_FEXT_SCANREQ
188 * and the scan request parameters will be present
189 * in iv_scanreq. Otherwise we do the default.
190 */
191 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
192 ieee80211_check_scan(vap,
193 vap->iv_scanreq_flags,
194 vap->iv_scanreq_duration,
195 vap->iv_scanreq_mindwell,
196 vap->iv_scanreq_maxdwell,
197 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
198 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
199 } else
200 ieee80211_check_scan_current(vap);
201 break;
202 case IEEE80211_S_SCAN:
203 /*
204 * This can happen because of a change in state
205 * that requires a reset. Trigger a new scan
206 * unless we're in manual roaming mode in which
207 * case an application must issue an explicit request.
208 */
209 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
210 ieee80211_check_scan_current(vap);
211 break;
212 default:
213 goto invalid;
214 }
215 break;
216 case IEEE80211_S_RUN:
217 if (vap->iv_flags & IEEE80211_F_WPA) {
218 /* XXX validate prerequisites */
219 }
220 switch (ostate) {
221 case IEEE80211_S_INIT:
222 /*
223 * Already have a channel; bypass the
224 * scan and startup immediately.
225 * Note that ieee80211_create_ibss will call
226 * back to do a RUN->RUN state change.
227 */
228 ieee80211_create_ibss(vap,
229 ieee80211_ht_adjust_channel(ic,
230 ic->ic_curchan, vap->iv_flags_ht));
231 /* NB: iv_bss is changed on return */
232 ni = vap->iv_bss;
233 break;
234 case IEEE80211_S_SCAN:
235 #ifdef IEEE80211_DEBUG
236 if (ieee80211_msg_debug(vap)) {
237 ieee80211_note(vap,
238 "synchronized with %s ssid ",
239 ether_sprintf(ni->ni_bssid));
240 ieee80211_print_essid(vap->iv_bss->ni_essid,
241 ni->ni_esslen);
242 /* XXX MCS/HT */
243 printf(" channel %d start %uMb\n",
244 ieee80211_chan2ieee(ic, ic->ic_curchan),
245 IEEE80211_RATE2MBS(ni->ni_txrate));
246 }
247 #endif
248 break;
249 case IEEE80211_S_RUN: /* IBSS merge */
250 break;
251 default:
252 goto invalid;
253 }
254 /*
255 * When 802.1x is not in use mark the port authorized
256 * at this point so traffic can flow.
257 */
258 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
259 ieee80211_node_authorize(ni);
260 /*
261 * Fake association when joining an existing bss.
262 */
263 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) &&
264 ic->ic_newassoc != NULL)
265 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN);
266 break;
267 case IEEE80211_S_SLEEP:
268 vap->iv_sta_ps(vap, 0);
269 break;
270 default:
271 invalid:
272 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
273 "%s: unexpected state transition %s -> %s\n", __func__,
274 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
275 break;
276 }
277 return 0;
278 }
279
280 /*
281 * Decide if a received management frame should be
282 * printed when debugging is enabled. This filters some
283 * of the less interesting frames that come frequently
284 * (e.g. beacons).
285 */
286 static __inline int
287 doprint(struct ieee80211vap *vap, int subtype)
288 {
289 switch (subtype) {
290 case IEEE80211_FC0_SUBTYPE_BEACON:
291 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
292 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
293 return 1;
294 }
295 return 1;
296 }
297
298 /*
299 * Process a received frame. The node associated with the sender
300 * should be supplied. If nothing was found in the node table then
301 * the caller is assumed to supply a reference to iv_bss instead.
302 * The RSSI and a timestamp are also supplied. The RSSI data is used
303 * during AP scanning to select a AP to associate with; it can have
304 * any units so long as values have consistent units and higher values
305 * mean ``better signal''. The receive timestamp is currently not used
306 * by the 802.11 layer.
307 */
308 static int
309 adhoc_input(struct ieee80211_node *ni, struct mbuf *m,
310 const struct ieee80211_rx_stats *rxs, int rssi, int nf)
311 {
312 struct ieee80211vap *vap = ni->ni_vap;
313 struct ieee80211com *ic = ni->ni_ic;
314 struct ifnet *ifp = vap->iv_ifp;
315 struct ieee80211_frame *wh;
316 struct ieee80211_key *key;
317 struct ether_header *eh;
318 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
319 uint8_t dir, type, subtype, qos;
320 uint8_t *bssid;
321 int is_hw_decrypted = 0;
322 int has_decrypted = 0;
323
324 /*
325 * Some devices do hardware decryption all the way through
326 * to pretending the frame wasn't encrypted in the first place.
327 * So, tag it appropriately so it isn't discarded inappropriately.
328 */
329 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED))
330 is_hw_decrypted = 1;
331
332 if (m->m_flags & M_AMPDU_MPDU) {
333 /*
334 * Fastpath for A-MPDU reorder q resubmission. Frames
335 * w/ M_AMPDU_MPDU marked have already passed through
336 * here but were received out of order and been held on
337 * the reorder queue. When resubmitted they are marked
338 * with the M_AMPDU_MPDU flag and we can bypass most of
339 * the normal processing.
340 */
341 wh = mtod(m, struct ieee80211_frame *);
342 type = IEEE80211_FC0_TYPE_DATA;
343 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
344 subtype = IEEE80211_FC0_SUBTYPE_QOS_DATA;
345 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
346 goto resubmit_ampdu;
347 }
348
349 KASSERT(ni != NULL, ("null node"));
350 ni->ni_inact = ni->ni_inact_reload;
351
352 type = -1; /* undefined */
353
354 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
355 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
356 ni->ni_macaddr, NULL,
357 "too short (1): len %u", m->m_pkthdr.len);
358 vap->iv_stats.is_rx_tooshort++;
359 goto out;
360 }
361 /*
362 * Bit of a cheat here, we use a pointer for a 3-address
363 * frame format but don't reference fields past outside
364 * ieee80211_frame_min w/o first validating the data is
365 * present.
366 */
367 wh = mtod(m, struct ieee80211_frame *);
368
369 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
370 IEEE80211_FC0_VERSION_0) {
371 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
372 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
373 wh->i_fc[0], wh->i_fc[1]);
374 vap->iv_stats.is_rx_badversion++;
375 goto err;
376 }
377
378 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
379 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
380 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
381 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
382 if (dir != IEEE80211_FC1_DIR_NODS)
383 bssid = wh->i_addr1;
384 else if (type == IEEE80211_FC0_TYPE_CTL)
385 bssid = wh->i_addr1;
386 else {
387 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
388 IEEE80211_DISCARD_MAC(vap,
389 IEEE80211_MSG_ANY, ni->ni_macaddr,
390 NULL, "too short (2): len %u",
391 m->m_pkthdr.len);
392 vap->iv_stats.is_rx_tooshort++;
393 goto out;
394 }
395 bssid = wh->i_addr3;
396 }
397 /*
398 * Validate the bssid.
399 */
400 if (!(type == IEEE80211_FC0_TYPE_MGT &&
401 (subtype == IEEE80211_FC0_SUBTYPE_BEACON ||
402 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)) &&
403 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
404 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
405 /* not interested in */
406 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
407 bssid, NULL, "%s", "not to bss");
408 vap->iv_stats.is_rx_wrongbss++;
409 goto out;
410 }
411 /*
412 * Data frame, cons up a node when it doesn't
413 * exist. This should probably done after an ACL check.
414 */
415 if (type == IEEE80211_FC0_TYPE_DATA &&
416 ni == vap->iv_bss &&
417 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
418 /*
419 * Beware of frames that come in too early; we
420 * can receive broadcast frames and creating sta
421 * entries will blow up because there is no bss
422 * channel yet.
423 */
424 if (vap->iv_state != IEEE80211_S_RUN) {
425 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
426 wh, "data", "not in RUN state (%s)",
427 ieee80211_state_name[vap->iv_state]);
428 vap->iv_stats.is_rx_badstate++;
429 goto err;
430 }
431 /*
432 * Fake up a node for this newly discovered member
433 * of the IBSS.
434 *
435 * Note: This doesn't "upgrade" the node to 11n;
436 * that will happen after a probe request/response
437 * exchange.
438 */
439 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2);
440 if (ni == NULL) {
441 /* NB: stat kept for alloc failure */
442 goto err;
443 }
444 }
445 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
446 ni->ni_noise = nf;
447 if (IEEE80211_HAS_SEQ(type, subtype) &&
448 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
449 uint8_t tid = ieee80211_gettid(wh);
450 if (IEEE80211_QOS_HAS_SEQ(wh) &&
451 TID_TO_WME_AC(tid) >= WME_AC_VI)
452 ic->ic_wme.wme_hipri_traffic++;
453 if (! ieee80211_check_rxseq(ni, wh, bssid, rxs))
454 goto out;
455 }
456 }
457
458 switch (type) {
459 case IEEE80211_FC0_TYPE_DATA:
460 hdrspace = ieee80211_hdrspace(ic, wh);
461 if (m->m_len < hdrspace &&
462 (m = m_pullup(m, hdrspace)) == NULL) {
463 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
464 ni->ni_macaddr, NULL,
465 "data too short: expecting %u", hdrspace);
466 vap->iv_stats.is_rx_tooshort++;
467 goto out; /* XXX */
468 }
469 if (dir != IEEE80211_FC1_DIR_NODS) {
470 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
471 wh, "data", "incorrect dir 0x%x", dir);
472 vap->iv_stats.is_rx_wrongdir++;
473 goto out;
474 }
475 /* XXX no power-save support */
476
477 /*
478 * Handle A-MPDU re-ordering. If the frame is to be
479 * processed directly then ieee80211_ampdu_reorder
480 * will return 0; otherwise it has consumed the mbuf
481 * and we should do nothing more with it.
482 */
483 if ((m->m_flags & M_AMPDU) &&
484 ieee80211_ampdu_reorder(ni, m, rxs) != 0) {
485 m = NULL;
486 goto out;
487 }
488 resubmit_ampdu:
489
490 /*
491 * Handle privacy requirements. Note that we
492 * must not be preempted from here until after
493 * we (potentially) call ieee80211_crypto_demic;
494 * otherwise we may violate assumptions in the
495 * crypto cipher modules used to do delayed update
496 * of replay sequence numbers.
497 */
498 if (is_hw_decrypted || wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
499 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
500 /*
501 * Discard encrypted frames when privacy is off.
502 */
503 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
504 wh, "WEP", "%s", "PRIVACY off");
505 vap->iv_stats.is_rx_noprivacy++;
506 IEEE80211_NODE_STAT(ni, rx_noprivacy);
507 goto out;
508 }
509 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
510 /* NB: stats+msgs handled in crypto_decap */
511 IEEE80211_NODE_STAT(ni, rx_wepfail);
512 goto out;
513 }
514 wh = mtod(m, struct ieee80211_frame *);
515 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
516 has_decrypted = 1;
517 } else {
518 /* XXX M_WEP and IEEE80211_F_PRIVACY */
519 key = NULL;
520 }
521
522 /*
523 * Save QoS bits for use below--before we strip the header.
524 */
525 if (subtype == IEEE80211_FC0_SUBTYPE_QOS_DATA)
526 qos = ieee80211_getqos(wh)[0];
527 else
528 qos = 0;
529
530 /*
531 * Next up, any fragmentation.
532 */
533 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
534 m = ieee80211_defrag(ni, m, hdrspace, has_decrypted);
535 if (m == NULL) {
536 /* Fragment dropped or frame not complete yet */
537 goto out;
538 }
539 }
540 wh = NULL; /* no longer valid, catch any uses */
541
542 /*
543 * Next strip any MSDU crypto bits.
544 */
545 if (!ieee80211_crypto_demic(vap, key, m, 0)) {
546 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
547 ni->ni_macaddr, "data", "%s", "demic error");
548 vap->iv_stats.is_rx_demicfail++;
549 IEEE80211_NODE_STAT(ni, rx_demicfail);
550 goto out;
551 }
552
553 /* copy to listener after decrypt */
554 if (ieee80211_radiotap_active_vap(vap))
555 ieee80211_radiotap_rx(vap, m);
556 need_tap = 0;
557
558 /*
559 * Finally, strip the 802.11 header.
560 */
561 m = ieee80211_decap(vap, m, hdrspace, qos);
562 if (m == NULL) {
563 /* XXX mask bit to check for both */
564 /* don't count Null data frames as errors */
565 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
566 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
567 goto out;
568 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
569 ni->ni_macaddr, "data", "%s", "decap error");
570 vap->iv_stats.is_rx_decap++;
571 IEEE80211_NODE_STAT(ni, rx_decap);
572 goto err;
573 }
574 if (!(qos & IEEE80211_QOS_AMSDU))
575 eh = mtod(m, struct ether_header *);
576 else
577 eh = NULL;
578 if (!ieee80211_node_is_authorized(ni)) {
579 /*
580 * Deny any non-PAE frames received prior to
581 * authorization. For open/shared-key
582 * authentication the port is mark authorized
583 * after authentication completes. For 802.1x
584 * the port is not marked authorized by the
585 * authenticator until the handshake has completed.
586 */
587 if (eh == NULL ||
588 eh->ether_type != htons(ETHERTYPE_PAE)) {
589 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
590 ni->ni_macaddr, "data", "unauthorized or "
591 "unknown port: ether type 0x%x len %u",
592 eh == NULL ? -1 : eh->ether_type,
593 m->m_pkthdr.len);
594 vap->iv_stats.is_rx_unauth++;
595 IEEE80211_NODE_STAT(ni, rx_unauth);
596 goto err;
597 }
598 } else {
599 /*
600 * When denying unencrypted frames, discard
601 * any non-PAE frames received without encryption.
602 */
603 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
604 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
605 (is_hw_decrypted == 0) &&
606 (eh == NULL ||
607 eh->ether_type != htons(ETHERTYPE_PAE))) {
608 /*
609 * Drop unencrypted frames.
610 */
611 vap->iv_stats.is_rx_unencrypted++;
612 IEEE80211_NODE_STAT(ni, rx_unencrypted);
613 goto out;
614 }
615 }
616 /* XXX require HT? */
617 if (qos & IEEE80211_QOS_AMSDU) {
618 m = ieee80211_decap_amsdu(ni, m);
619 if (m == NULL)
620 return IEEE80211_FC0_TYPE_DATA;
621 } else {
622 #ifdef IEEE80211_SUPPORT_SUPERG
623 m = ieee80211_decap_fastframe(vap, ni, m);
624 if (m == NULL)
625 return IEEE80211_FC0_TYPE_DATA;
626 #endif
627 }
628 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
629 ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
630 else
631 ieee80211_deliver_data(vap, ni, m);
632 return IEEE80211_FC0_TYPE_DATA;
633
634 case IEEE80211_FC0_TYPE_MGT:
635 vap->iv_stats.is_rx_mgmt++;
636 IEEE80211_NODE_STAT(ni, rx_mgmt);
637 if (dir != IEEE80211_FC1_DIR_NODS) {
638 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
639 wh, "data", "incorrect dir 0x%x", dir);
640 vap->iv_stats.is_rx_wrongdir++;
641 goto err;
642 }
643 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
644 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
645 ni->ni_macaddr, "mgt", "too short: len %u",
646 m->m_pkthdr.len);
647 vap->iv_stats.is_rx_tooshort++;
648 goto out;
649 }
650 #ifdef IEEE80211_DEBUG
651 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
652 ieee80211_msg_dumppkts(vap)) {
653 if_printf(ifp, "received %s from %s rssi %d\n",
654 ieee80211_mgt_subtype_name(subtype),
655 ether_sprintf(wh->i_addr2), rssi);
656 }
657 #endif
658 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
659 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
660 wh, NULL, "%s", "WEP set but not permitted");
661 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
662 goto out;
663 }
664 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
665 goto out;
666
667 case IEEE80211_FC0_TYPE_CTL:
668 vap->iv_stats.is_rx_ctl++;
669 IEEE80211_NODE_STAT(ni, rx_ctrl);
670 vap->iv_recv_ctl(ni, m, subtype);
671 goto out;
672
673 default:
674 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
675 wh, "bad", "frame type 0x%x", type);
676 /* should not come here */
677 break;
678 }
679 err:
680 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
681 out:
682 if (m != NULL) {
683 if (need_tap && ieee80211_radiotap_active_vap(vap))
684 ieee80211_radiotap_rx(vap, m);
685 m_freem(m);
686 }
687 return type;
688 }
689
690 static int
691 is11bclient(const uint8_t *rates, const uint8_t *xrates)
692 {
693 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
694 int i;
695
696 /* NB: the 11b clients we care about will not have xrates */
697 if (xrates != NULL || rates == NULL)
698 return 0;
699 for (i = 0; i < rates[1]; i++) {
700 int r = rates[2+i] & IEEE80211_RATE_VAL;
701 if (r > 2*11 || ((1<<r) & brates) == 0)
702 return 0;
703 }
704 return 1;
705 }
706
707 static void
708 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
709 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
710 {
711 struct ieee80211vap *vap = ni->ni_vap;
712 struct ieee80211com *ic = ni->ni_ic;
713 struct ieee80211_channel *rxchan = ic->ic_curchan;
714 struct ieee80211_frame *wh;
715 uint8_t *frm, *efrm;
716 uint8_t *ssid, *rates, *xrates;
717 #if 0
718 int ht_state_change = 0;
719 #endif
720
721 wh = mtod(m0, struct ieee80211_frame *);
722 frm = (uint8_t *)&wh[1];
723 efrm = mtod(m0, uint8_t *) + m0->m_len;
724
725 IEEE80211_DPRINTF(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_DEBUG,
726 "%s: recv mgmt frame, addr2=%6D, ni=%p (%6D) fc=%.02x %.02x\n",
727 __func__,
728 wh->i_addr2, ":",
729 ni,
730 ni->ni_macaddr, ":",
731 wh->i_fc[0],
732 wh->i_fc[1]);
733 switch (subtype) {
734 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
735 case IEEE80211_FC0_SUBTYPE_BEACON: {
736 struct ieee80211_scanparams scan;
737 struct ieee80211_channel *c;
738 /*
739 * We process beacon/probe response
740 * frames to discover neighbors.
741 */
742 if (rxs != NULL) {
743 c = ieee80211_lookup_channel_rxstatus(vap, rxs);
744 if (c != NULL)
745 rxchan = c;
746 }
747 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0)
748 return;
749 /*
750 * Count frame now that we know it's to be processed.
751 */
752 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
753 vap->iv_stats.is_rx_beacon++; /* XXX remove */
754 IEEE80211_NODE_STAT(ni, rx_beacons);
755 } else
756 IEEE80211_NODE_STAT(ni, rx_proberesp);
757 /*
758 * If scanning, just pass information to the scan module.
759 */
760 if (ic->ic_flags & IEEE80211_F_SCAN) {
761 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
762 /*
763 * Actively scanning a channel marked passive;
764 * send a probe request now that we know there
765 * is 802.11 traffic present.
766 *
767 * XXX check if the beacon we recv'd gives
768 * us what we need and suppress the probe req
769 */
770 ieee80211_probe_curchan(vap, 1);
771 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
772 }
773 ieee80211_add_scan(vap, rxchan, &scan, wh,
774 subtype, rssi, nf);
775 return;
776 }
777 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
778 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
779 /*
780 * Create a new entry in the neighbor table.
781 *
782 * XXX TODO:
783 *
784 * Here we're not scanning; so if we have an
785 * SSID then make sure it matches our SSID.
786 * Otherwise this code will match on all IBSS
787 * beacons/probe requests for all SSIDs,
788 * filling the node table with nodes that
789 * aren't ours.
790 */
791 if (ieee80211_ibss_node_check_new(ni, &scan)) {
792 ni = ieee80211_add_neighbor(vap, wh, &scan);
793 /*
794 * Send a probe request so we announce 11n
795 * capabilities.
796 */
797 ieee80211_send_probereq(ni, /* node */
798 vap->iv_myaddr, /* SA */
799 ni->ni_macaddr, /* DA */
800 vap->iv_bss->ni_bssid, /* BSSID */
801 vap->iv_bss->ni_essid,
802 vap->iv_bss->ni_esslen); /* SSID */
803 } else
804 ni = NULL;
805
806 /*
807 * Send a probe request so we announce 11n
808 * capabilities.
809 *
810 * Don't do this if we're scanning.
811 */
812 if (! (ic->ic_flags & IEEE80211_F_SCAN))
813 ieee80211_send_probereq(ni, /* node */
814 vap->iv_myaddr, /* SA */
815 ni->ni_macaddr, /* DA */
816 vap->iv_bss->ni_bssid, /* BSSID */
817 vap->iv_bss->ni_essid,
818 vap->iv_bss->ni_esslen); /* SSID */
819
820 } else if (ni->ni_capinfo == 0) {
821 /*
822 * Update faked node created on transmit.
823 * Note this also updates the tsf.
824 */
825 ieee80211_init_neighbor(ni, wh, &scan);
826
827 /*
828 * Send a probe request so we announce 11n
829 * capabilities.
830 */
831 ieee80211_send_probereq(ni, /* node */
832 vap->iv_myaddr, /* SA */
833 ni->ni_macaddr, /* DA */
834 vap->iv_bss->ni_bssid, /* BSSID */
835 vap->iv_bss->ni_essid,
836 vap->iv_bss->ni_esslen); /* SSID */
837 } else {
838 /*
839 * Record tsf for potential resync.
840 */
841 memcpy(ni->ni_tstamp.data, scan.tstamp,
842 sizeof(ni->ni_tstamp));
843 }
844 /*
845 * This isn't enabled yet - otherwise it would
846 * update the HT parameters and channel width
847 * from any node, which could lead to lots of
848 * strange behaviour if the 11n nodes aren't
849 * exactly configured to match.
850 */
851 #if 0
852 if (scan.htcap != NULL && scan.htinfo != NULL &&
853 (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
854 ieee80211_ht_updateparams(ni,
855 scan.htcap, scan.htinfo));
856 if (ieee80211_ht_updateparams_final(ni,
857 scan.htcap, scan.htinfo))
858 ht_state_change = 1;
859 }
860
861 /* XXX same for VHT? */
862 #endif
863 if (ni != NULL) {
864 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
865 ni->ni_noise = nf;
866 }
867 /*
868 * Same here - the channel width change should
869 * be applied to the specific peer node, not
870 * to the ic. Ie, the interface configuration
871 * should stay in its current channel width;
872 * but it should change the rate control and
873 * any queued frames for the given node only.
874 *
875 * Since there's no (current) way to inform
876 * the driver that a channel width change has
877 * occurred for a single node, just stub this
878 * out.
879 */
880 #if 0
881 if (ht_state_change)
882 ieee80211_update_chw(ic);
883 #endif
884 }
885 break;
886 }
887
888 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
889 if (vap->iv_state != IEEE80211_S_RUN) {
890 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
891 wh, NULL, "wrong state %s",
892 ieee80211_state_name[vap->iv_state]);
893 vap->iv_stats.is_rx_mgtdiscard++;
894 return;
895 }
896 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
897 /* frame must be directed */
898 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
899 wh, NULL, "%s", "not unicast");
900 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */
901 return;
902 }
903
904 /*
905 * prreq frame format
906 * [tlv] ssid
907 * [tlv] supported rates
908 * [tlv] extended supported rates
909 */
910 ssid = rates = xrates = NULL;
911 while (efrm - frm > 1) {
912 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
913 switch (*frm) {
914 case IEEE80211_ELEMID_SSID:
915 ssid = frm;
916 break;
917 case IEEE80211_ELEMID_RATES:
918 rates = frm;
919 break;
920 case IEEE80211_ELEMID_XRATES:
921 xrates = frm;
922 break;
923 }
924 frm += frm[1] + 2;
925 }
926 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
927 if (xrates != NULL)
928 IEEE80211_VERIFY_ELEMENT(xrates,
929 IEEE80211_RATE_MAXSIZE - rates[1], return);
930 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
931 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
932 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
933 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
934 wh, NULL,
935 "%s", "no ssid with ssid suppression enabled");
936 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
937 return;
938 }
939
940 /* XXX find a better class or define it's own */
941 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
942 "%s", "recv probe req");
943 /*
944 * Some legacy 11b clients cannot hack a complete
945 * probe response frame. When the request includes
946 * only a bare-bones rate set, communicate this to
947 * the transmit side.
948 */
949 ieee80211_send_proberesp(vap, wh->i_addr2,
950 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
951
952 /*
953 * Note: we don't benefit from stashing the probe request
954 * IEs away to use for IBSS negotiation, because we
955 * typically don't get all of the IEs.
956 */
957 break;
958
959 case IEEE80211_FC0_SUBTYPE_ACTION:
960 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
961 if ((ni == vap->iv_bss) &&
962 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
963 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
964 wh, NULL, "%s", "unknown node");
965 vap->iv_stats.is_rx_mgtdiscard++;
966 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
967 !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
968 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_DEBUG,
969 wh, NULL, "%s", "not for us");
970 vap->iv_stats.is_rx_mgtdiscard++;
971 } else if (vap->iv_state != IEEE80211_S_RUN) {
972 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_DEBUG,
973 wh, NULL, "wrong state %s",
974 ieee80211_state_name[vap->iv_state]);
975 vap->iv_stats.is_rx_mgtdiscard++;
976 } else {
977 if (ieee80211_parse_action(ni, m0) == 0)
978 (void)ic->ic_recv_action(ni, wh, frm, efrm);
979 }
980 break;
981
982 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
983 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
984 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
985 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
986 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
987 case IEEE80211_FC0_SUBTYPE_ATIM:
988 case IEEE80211_FC0_SUBTYPE_DISASSOC:
989 case IEEE80211_FC0_SUBTYPE_AUTH:
990 case IEEE80211_FC0_SUBTYPE_DEAUTH:
991 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
992 wh, NULL, "%s", "not handled");
993 vap->iv_stats.is_rx_mgtdiscard++;
994 break;
995
996 default:
997 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
998 wh, "mgt", "subtype 0x%x not handled", subtype);
999 vap->iv_stats.is_rx_badsubtype++;
1000 break;
1001 }
1002 }
1003 #undef IEEE80211_VERIFY_LENGTH
1004 #undef IEEE80211_VERIFY_ELEMENT
1005
1006 static void
1007 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1008 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
1009 {
1010 struct ieee80211vap *vap = ni->ni_vap;
1011 struct ieee80211com *ic = ni->ni_ic;
1012
1013 /*
1014 * Process management frames when scanning; useful for doing
1015 * a site-survey.
1016 */
1017 if (ic->ic_flags & IEEE80211_F_SCAN)
1018 adhoc_recv_mgmt(ni, m0, subtype, rxs, rssi, nf);
1019 else {
1020 #ifdef IEEE80211_DEBUG
1021 struct ieee80211_frame *wh;
1022
1023 wh = mtod(m0, struct ieee80211_frame *);
1024 #endif
1025 switch (subtype) {
1026 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1027 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1028 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
1029 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
1030 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1031 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1032 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
1033 case IEEE80211_FC0_SUBTYPE_BEACON:
1034 case IEEE80211_FC0_SUBTYPE_ATIM:
1035 case IEEE80211_FC0_SUBTYPE_DISASSOC:
1036 case IEEE80211_FC0_SUBTYPE_AUTH:
1037 case IEEE80211_FC0_SUBTYPE_DEAUTH:
1038 case IEEE80211_FC0_SUBTYPE_ACTION:
1039 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
1040 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1041 wh, NULL, "%s", "not handled");
1042 vap->iv_stats.is_rx_mgtdiscard++;
1043 break;
1044 default:
1045 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1046 wh, "mgt", "subtype 0x%x not handled", subtype);
1047 vap->iv_stats.is_rx_badsubtype++;
1048 break;
1049 }
1050 }
1051 }
1052
1053 static void
1054 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
1055 {
1056
1057 switch (subtype) {
1058 case IEEE80211_FC0_SUBTYPE_BAR:
1059 ieee80211_recv_bar(ni, m);
1060 break;
1061 }
1062 }
Cache object: a5375e5be52f770cffd524b78fdc34c6
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