1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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 /*
29 * IEEE 802.11 IBSS mode support.
30 */
31 #include "opt_inet.h"
32 #include "opt_wlan.h"
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/mbuf.h>
37 #include <sys/malloc.h>
38 #include <sys/kernel.h>
39
40 #include <sys/socket.h>
41 #include <sys/sockio.h>
42 #include <sys/endian.h>
43 #include <sys/errno.h>
44 #include <sys/proc.h>
45 #include <sys/sysctl.h>
46
47 #include <net/if.h>
48 #include <net/if_var.h>
49 #include <net/if_media.h>
50 #include <net/if_llc.h>
51 #include <net/if_private.h>
52 #include <net/ethernet.h>
53
54 #include <net/bpf.h>
55
56 #include <net80211/ieee80211_var.h>
57 #include <net80211/ieee80211_adhoc.h>
58 #include <net80211/ieee80211_input.h>
59 #ifdef IEEE80211_SUPPORT_SUPERG
60 #include <net80211/ieee80211_superg.h>
61 #endif
62 #ifdef IEEE80211_SUPPORT_TDMA
63 #include <net80211/ieee80211_tdma.h>
64 #endif
65 #include <net80211/ieee80211_sta.h>
66
67 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2)
68
69 static void adhoc_vattach(struct ieee80211vap *);
70 static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int);
71 static int adhoc_input(struct ieee80211_node *, struct mbuf *,
72 const struct ieee80211_rx_stats *, int, int);
73 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *,
74 int subtype, const struct ieee80211_rx_stats *, int, int);
75 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *,
76 int subtype, const struct ieee80211_rx_stats *rxs, int, int);
77 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
78
79 void
ieee80211_adhoc_attach(struct ieee80211com * ic)80 ieee80211_adhoc_attach(struct ieee80211com *ic)
81 {
82 ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach;
83 ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach;
84 }
85
86 void
ieee80211_adhoc_detach(struct ieee80211com * ic)87 ieee80211_adhoc_detach(struct ieee80211com *ic)
88 {
89 }
90
91 static void
adhoc_vdetach(struct ieee80211vap * vap)92 adhoc_vdetach(struct ieee80211vap *vap)
93 {
94 }
95
96 static void
adhoc_vattach(struct ieee80211vap * vap)97 adhoc_vattach(struct ieee80211vap *vap)
98 {
99 vap->iv_newstate = adhoc_newstate;
100 vap->iv_input = adhoc_input;
101 if (vap->iv_opmode == IEEE80211_M_IBSS)
102 vap->iv_recv_mgmt = adhoc_recv_mgmt;
103 else
104 vap->iv_recv_mgmt = ahdemo_recv_mgmt;
105 vap->iv_recv_ctl = adhoc_recv_ctl;
106 vap->iv_opdetach = adhoc_vdetach;
107 #ifdef IEEE80211_SUPPORT_TDMA
108 /*
109 * Throw control to tdma support. Note we do this
110 * after setting up our callbacks so it can piggyback
111 * on top of us.
112 */
113 if (vap->iv_caps & IEEE80211_C_TDMA)
114 ieee80211_tdma_vattach(vap);
115 #endif
116 }
117
118 static void
sta_leave(void * arg,struct ieee80211_node * ni)119 sta_leave(void *arg, struct ieee80211_node *ni)
120 {
121 struct ieee80211vap *vap = ni->ni_vap;
122
123 if (ni != vap->iv_bss)
124 ieee80211_node_leave(ni);
125 }
126
127 /*
128 * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler.
129 */
130 static int
adhoc_newstate(struct ieee80211vap * vap,enum ieee80211_state nstate,int arg)131 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
132 {
133 struct ieee80211com *ic = vap->iv_ic;
134 struct ieee80211_node *ni;
135 enum ieee80211_state ostate;
136
137 IEEE80211_LOCK_ASSERT(vap->iv_ic);
138
139 ostate = vap->iv_state;
140 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
141 __func__, ieee80211_state_name[ostate],
142 ieee80211_state_name[nstate], arg);
143 vap->iv_state = nstate; /* state transition */
144 if (ostate != IEEE80211_S_SCAN)
145 ieee80211_cancel_scan(vap); /* background scan */
146 ni = vap->iv_bss; /* NB: no reference held */
147 switch (nstate) {
148 case IEEE80211_S_INIT:
149 switch (ostate) {
150 case IEEE80211_S_SCAN:
151 ieee80211_cancel_scan(vap);
152 break;
153 default:
154 break;
155 }
156 if (ostate != IEEE80211_S_INIT) {
157 /* NB: optimize INIT -> INIT case */
158 ieee80211_reset_bss(vap);
159 }
160 break;
161 case IEEE80211_S_SCAN:
162 switch (ostate) {
163 case IEEE80211_S_RUN: /* beacon miss */
164 /* purge station table; entries are stale */
165 ieee80211_iterate_nodes_vap(&ic->ic_sta, vap,
166 sta_leave, NULL);
167 /* fall thru... */
168 case IEEE80211_S_INIT:
169 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
170 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
171 /*
172 * Already have a channel; bypass the
173 * scan and startup immediately.
174 */
175 ieee80211_create_ibss(vap,
176 ieee80211_ht_adjust_channel(ic,
177 vap->iv_des_chan, vap->iv_flags_ht));
178 break;
179 }
180 /*
181 * Initiate a scan. We can come here as a result
182 * of an IEEE80211_IOC_SCAN_REQ too in which case
183 * the vap will be marked with IEEE80211_FEXT_SCANREQ
184 * and the scan request parameters will be present
185 * in iv_scanreq. Otherwise we do the default.
186 */
187 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
188 ieee80211_check_scan(vap,
189 vap->iv_scanreq_flags,
190 vap->iv_scanreq_duration,
191 vap->iv_scanreq_mindwell,
192 vap->iv_scanreq_maxdwell,
193 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
194 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
195 } else
196 ieee80211_check_scan_current(vap);
197 break;
198 case IEEE80211_S_SCAN:
199 /*
200 * This can happen because of a change in state
201 * that requires a reset. Trigger a new scan
202 * unless we're in manual roaming mode in which
203 * case an application must issue an explicit request.
204 */
205 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
206 ieee80211_check_scan_current(vap);
207 break;
208 default:
209 goto invalid;
210 }
211 break;
212 case IEEE80211_S_RUN:
213 if (vap->iv_flags & IEEE80211_F_WPA) {
214 /* XXX validate prerequisites */
215 }
216 switch (ostate) {
217 case IEEE80211_S_INIT:
218 /*
219 * Already have a channel; bypass the
220 * scan and startup immediately.
221 * Note that ieee80211_create_ibss will call
222 * back to do a RUN->RUN state change.
223 */
224 ieee80211_create_ibss(vap,
225 ieee80211_ht_adjust_channel(ic,
226 ic->ic_curchan, vap->iv_flags_ht));
227 /* NB: iv_bss is changed on return */
228 ni = vap->iv_bss;
229 break;
230 case IEEE80211_S_SCAN:
231 #ifdef IEEE80211_DEBUG
232 if (ieee80211_msg_debug(vap)) {
233 ieee80211_note(vap,
234 "synchronized with %s ssid ",
235 ether_sprintf(ni->ni_bssid));
236 ieee80211_print_essid(vap->iv_bss->ni_essid,
237 ni->ni_esslen);
238 printf(" channel %d start %uMbit/s\n",
239 ieee80211_chan2ieee(ic, ic->ic_curchan),
240 ieee80211_node_get_txrate_kbit(ni) / 1000);
241 }
242 #endif
243 break;
244 case IEEE80211_S_RUN: /* IBSS merge */
245 break;
246 default:
247 goto invalid;
248 }
249 /*
250 * When 802.1x is not in use mark the port authorized
251 * at this point so traffic can flow.
252 */
253 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
254 ieee80211_node_authorize(ni);
255 /*
256 * Fake association when joining an existing bss.
257 */
258 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) &&
259 ic->ic_newassoc != NULL)
260 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN);
261 break;
262 case IEEE80211_S_SLEEP:
263 vap->iv_sta_ps(vap, 0);
264 break;
265 default:
266 invalid:
267 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
268 "%s: unexpected state transition %s -> %s\n", __func__,
269 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
270 break;
271 }
272 return 0;
273 }
274
275 /*
276 * Decide if a received management frame should be
277 * printed when debugging is enabled. This filters some
278 * of the less interesting frames that come frequently
279 * (e.g. beacons).
280 */
281 static __inline int
doprint(struct ieee80211vap * vap,int subtype)282 doprint(struct ieee80211vap *vap, int subtype)
283 {
284 switch (subtype) {
285 case IEEE80211_FC0_SUBTYPE_BEACON:
286 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
287 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
288 return 1;
289 }
290 return 1;
291 }
292
293 /*
294 * Process a received frame. The node associated with the sender
295 * should be supplied. If nothing was found in the node table then
296 * the caller is assumed to supply a reference to iv_bss instead.
297 * The RSSI and a timestamp are also supplied. The RSSI data is used
298 * during AP scanning to select a AP to associate with; it can have
299 * any units so long as values have consistent units and higher values
300 * mean ``better signal''. The receive timestamp is currently not used
301 * by the 802.11 layer.
302 */
303 static int
adhoc_input(struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_rx_stats * rxs,int rssi,int nf)304 adhoc_input(struct ieee80211_node *ni, struct mbuf *m,
305 const struct ieee80211_rx_stats *rxs, int rssi, int nf)
306 {
307 struct ieee80211vap *vap = ni->ni_vap;
308 struct ieee80211com *ic = ni->ni_ic;
309 struct ifnet *ifp = vap->iv_ifp;
310 struct ieee80211_frame *wh;
311 struct ieee80211_key *key;
312 struct ether_header *eh;
313 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
314 uint8_t dir, type, subtype, qos;
315 uint8_t *bssid;
316 int is_hw_decrypted = 0;
317 int has_decrypted = 0;
318
319 /*
320 * Some devices do hardware decryption all the way through
321 * to pretending the frame wasn't encrypted in the first place.
322 * So, tag it appropriately so it isn't discarded inappropriately.
323 */
324 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED))
325 is_hw_decrypted = 1;
326
327 if (m->m_flags & M_AMPDU_MPDU) {
328 /*
329 * Fastpath for A-MPDU reorder q resubmission. Frames
330 * w/ M_AMPDU_MPDU marked have already passed through
331 * here but were received out of order and been held on
332 * the reorder queue. When resubmitted they are marked
333 * with the M_AMPDU_MPDU flag and we can bypass most of
334 * the normal processing.
335 */
336 wh = mtod(m, struct ieee80211_frame *);
337 type = IEEE80211_FC0_TYPE_DATA;
338 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
339 subtype = IEEE80211_FC0_SUBTYPE_QOS_DATA;
340 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
341 goto resubmit_ampdu;
342 }
343
344 KASSERT(ni != NULL, ("null node"));
345 ni->ni_inact = ni->ni_inact_reload;
346
347 type = -1; /* undefined */
348
349 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
350 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
351 ni->ni_macaddr, NULL,
352 "too short (1): len %u", m->m_pkthdr.len);
353 vap->iv_stats.is_rx_tooshort++;
354 goto out;
355 }
356 /*
357 * Bit of a cheat here, we use a pointer for a 3-address
358 * frame format but don't reference fields past outside
359 * ieee80211_frame_min w/o first validating the data is
360 * present.
361 */
362 wh = mtod(m, struct ieee80211_frame *);
363
364 if (!IEEE80211_IS_FC0_CHECK_VER(wh, IEEE80211_FC0_VERSION_0)) {
365 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
366 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
367 wh->i_fc[0], wh->i_fc[1]);
368 vap->iv_stats.is_rx_badversion++;
369 goto err;
370 }
371
372 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
373 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
374 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
375 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
376 if (dir != IEEE80211_FC1_DIR_NODS)
377 bssid = wh->i_addr1;
378 else if (type == IEEE80211_FC0_TYPE_CTL)
379 bssid = wh->i_addr1;
380 else {
381 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
382 IEEE80211_DISCARD_MAC(vap,
383 IEEE80211_MSG_ANY, ni->ni_macaddr,
384 NULL, "too short (2): len %u",
385 m->m_pkthdr.len);
386 vap->iv_stats.is_rx_tooshort++;
387 goto out;
388 }
389 bssid = wh->i_addr3;
390 }
391 /*
392 * Validate the bssid.
393 */
394 if (!(type == IEEE80211_FC0_TYPE_MGT &&
395 (subtype == IEEE80211_FC0_SUBTYPE_BEACON ||
396 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)) &&
397 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
398 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
399 /* not interested in */
400 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
401 bssid, NULL, "%s", "not to bss");
402 vap->iv_stats.is_rx_wrongbss++;
403 goto out;
404 }
405 /*
406 * Data frame, cons up a node when it doesn't
407 * exist. This should probably done after an ACL check.
408 */
409 if (type == IEEE80211_FC0_TYPE_DATA &&
410 ni == vap->iv_bss &&
411 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
412 /*
413 * Beware of frames that come in too early; we
414 * can receive broadcast frames and creating sta
415 * entries will blow up because there is no bss
416 * channel yet.
417 */
418 if (vap->iv_state != IEEE80211_S_RUN) {
419 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
420 wh, "data", "not in RUN state (%s)",
421 ieee80211_state_name[vap->iv_state]);
422 vap->iv_stats.is_rx_badstate++;
423 goto err;
424 }
425 /*
426 * Fake up a node for this newly discovered member
427 * of the IBSS.
428 *
429 * Note: This doesn't "upgrade" the node to 11n;
430 * that will happen after a probe request/response
431 * exchange.
432 */
433 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2);
434 if (ni == NULL) {
435 /* NB: stat kept for alloc failure */
436 goto err;
437 }
438 }
439 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
440 ni->ni_noise = nf;
441 if (IEEE80211_HAS_SEQ(type, subtype) &&
442 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
443 uint8_t tid = ieee80211_gettid(wh);
444 if (IEEE80211_QOS_HAS_SEQ(wh) &&
445 TID_TO_WME_AC(tid) >= WME_AC_VI)
446 ic->ic_wme.wme_hipri_traffic++;
447 if (! ieee80211_check_rxseq(ni, wh, bssid, rxs))
448 goto out;
449 }
450 }
451
452 switch (type) {
453 case IEEE80211_FC0_TYPE_DATA:
454 hdrspace = ieee80211_hdrspace(ic, wh);
455 if (m->m_len < hdrspace &&
456 (m = m_pullup(m, hdrspace)) == NULL) {
457 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
458 ni->ni_macaddr, NULL,
459 "data too short: expecting %u", hdrspace);
460 vap->iv_stats.is_rx_tooshort++;
461 goto out; /* XXX */
462 }
463 if (dir != IEEE80211_FC1_DIR_NODS) {
464 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
465 wh, "data", "incorrect dir 0x%x", dir);
466 vap->iv_stats.is_rx_wrongdir++;
467 goto out;
468 }
469 /* XXX no power-save support */
470
471 /*
472 * Handle A-MPDU re-ordering. If the frame is to be
473 * processed directly then ieee80211_ampdu_reorder
474 * will return 0; otherwise it has consumed the mbuf
475 * and we should do nothing more with it.
476 */
477 if ((m->m_flags & M_AMPDU) &&
478 ieee80211_ampdu_reorder(ni, m, rxs) != 0) {
479 m = NULL;
480 goto out;
481 }
482 resubmit_ampdu:
483
484 /*
485 * Handle privacy requirements. Note that we
486 * must not be preempted from here until after
487 * we (potentially) call ieee80211_crypto_demic;
488 * otherwise we may violate assumptions in the
489 * crypto cipher modules used to do delayed update
490 * of replay sequence numbers.
491 */
492 if (is_hw_decrypted || IEEE80211_IS_PROTECTED(wh)) {
493 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
494 /*
495 * Discard encrypted frames when privacy is off.
496 */
497 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
498 wh, "WEP", "%s", "PRIVACY off");
499 vap->iv_stats.is_rx_noprivacy++;
500 IEEE80211_NODE_STAT(ni, rx_noprivacy);
501 goto out;
502 }
503 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
504 /* NB: stats+msgs handled in crypto_decap */
505 IEEE80211_NODE_STAT(ni, rx_wepfail);
506 goto out;
507 }
508 wh = mtod(m, struct ieee80211_frame *);
509 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
510 has_decrypted = 1;
511 } else {
512 /* XXX M_WEP and IEEE80211_F_PRIVACY */
513 key = NULL;
514 }
515
516 /*
517 * Save QoS bits for use below--before we strip the header.
518 */
519 if (subtype == IEEE80211_FC0_SUBTYPE_QOS_DATA)
520 qos = ieee80211_getqos(wh)[0];
521 else
522 qos = 0;
523
524 /*
525 * Next up, any fragmentation.
526 */
527 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
528 m = ieee80211_defrag(ni, m, hdrspace, has_decrypted);
529 if (m == NULL) {
530 /* Fragment dropped or frame not complete yet */
531 goto out;
532 }
533 }
534 wh = NULL; /* no longer valid, catch any uses */
535
536 /*
537 * Next strip any MSDU crypto bits.
538 */
539 if (!ieee80211_crypto_demic(vap, key, m, 0)) {
540 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
541 ni->ni_macaddr, "data", "%s", "demic error");
542 vap->iv_stats.is_rx_demicfail++;
543 IEEE80211_NODE_STAT(ni, rx_demicfail);
544 goto out;
545 }
546
547 /* copy to listener after decrypt */
548 if (ieee80211_radiotap_active_vap(vap))
549 ieee80211_radiotap_rx(vap, m);
550 need_tap = 0;
551
552 /*
553 * Finally, strip the 802.11 header.
554 */
555 m = ieee80211_decap(vap, m, hdrspace, qos);
556 if (m == NULL) {
557 /* XXX mask bit to check for both */
558 /* don't count Null data frames as errors */
559 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
560 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
561 goto out;
562 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
563 ni->ni_macaddr, "data", "%s", "decap error");
564 vap->iv_stats.is_rx_decap++;
565 IEEE80211_NODE_STAT(ni, rx_decap);
566 goto err;
567 }
568 if (!(qos & IEEE80211_QOS_AMSDU))
569 eh = mtod(m, struct ether_header *);
570 else
571 eh = NULL;
572 if (!ieee80211_node_is_authorized(ni)) {
573 /*
574 * Deny any non-PAE frames received prior to
575 * authorization. For open/shared-key
576 * authentication the port is mark authorized
577 * after authentication completes. For 802.1x
578 * the port is not marked authorized by the
579 * authenticator until the handshake has completed.
580 */
581 if (eh == NULL ||
582 eh->ether_type != htons(ETHERTYPE_PAE)) {
583 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
584 ni->ni_macaddr, "data", "unauthorized or "
585 "unknown port: ether type 0x%x len %u",
586 eh == NULL ? -1 : eh->ether_type,
587 m->m_pkthdr.len);
588 vap->iv_stats.is_rx_unauth++;
589 IEEE80211_NODE_STAT(ni, rx_unauth);
590 goto err;
591 }
592 } else {
593 /*
594 * When denying unencrypted frames, discard
595 * any non-PAE frames received without encryption.
596 */
597 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
598 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
599 (is_hw_decrypted == 0) &&
600 (eh == NULL ||
601 eh->ether_type != htons(ETHERTYPE_PAE))) {
602 /*
603 * Drop unencrypted frames.
604 */
605 vap->iv_stats.is_rx_unencrypted++;
606 IEEE80211_NODE_STAT(ni, rx_unencrypted);
607 goto out;
608 }
609 }
610 /* XXX require HT? */
611 if (qos & IEEE80211_QOS_AMSDU) {
612 m = ieee80211_decap_amsdu(ni, m);
613 if (m == NULL)
614 return IEEE80211_FC0_TYPE_DATA;
615 } else {
616 #ifdef IEEE80211_SUPPORT_SUPERG
617 m = ieee80211_decap_fastframe(vap, ni, m);
618 if (m == NULL)
619 return IEEE80211_FC0_TYPE_DATA;
620 #endif
621 }
622 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
623 ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
624 else
625 ieee80211_deliver_data(vap, ni, m);
626 return IEEE80211_FC0_TYPE_DATA;
627
628 case IEEE80211_FC0_TYPE_MGT:
629 vap->iv_stats.is_rx_mgmt++;
630 IEEE80211_NODE_STAT(ni, rx_mgmt);
631 if (dir != IEEE80211_FC1_DIR_NODS) {
632 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
633 wh, "data", "incorrect dir 0x%x", dir);
634 vap->iv_stats.is_rx_wrongdir++;
635 goto err;
636 }
637 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
638 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
639 ni->ni_macaddr, "mgt", "too short: len %u",
640 m->m_pkthdr.len);
641 vap->iv_stats.is_rx_tooshort++;
642 goto out;
643 }
644 #ifdef IEEE80211_DEBUG
645 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
646 ieee80211_msg_dumppkts(vap)) {
647 if_printf(ifp, "received %s from %s rssi %d\n",
648 ieee80211_mgt_subtype_name(subtype),
649 ether_sprintf(wh->i_addr2), rssi);
650 }
651 #endif
652 if (IEEE80211_IS_PROTECTED(wh)) {
653 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
654 wh, NULL, "%s", "WEP set but not permitted");
655 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
656 goto out;
657 }
658 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
659 goto out;
660
661 case IEEE80211_FC0_TYPE_CTL:
662 vap->iv_stats.is_rx_ctl++;
663 IEEE80211_NODE_STAT(ni, rx_ctrl);
664 vap->iv_recv_ctl(ni, m, subtype);
665 goto out;
666
667 default:
668 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
669 wh, "bad", "frame type 0x%x", type);
670 /* should not come here */
671 break;
672 }
673 err:
674 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
675 out:
676 if (m != NULL) {
677 if (need_tap && ieee80211_radiotap_active_vap(vap))
678 ieee80211_radiotap_rx(vap, m);
679 m_freem(m);
680 }
681 return type;
682 }
683
684 static int
is11bclient(const uint8_t * rates,const uint8_t * xrates)685 is11bclient(const uint8_t *rates, const uint8_t *xrates)
686 {
687 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
688 int i;
689
690 /* NB: the 11b clients we care about will not have xrates */
691 if (xrates != NULL || rates == NULL)
692 return 0;
693 for (i = 0; i < rates[1]; i++) {
694 int r = rates[2+i] & IEEE80211_RATE_VAL;
695 if (r > 2*11 || ((1<<r) & brates) == 0)
696 return 0;
697 }
698 return 1;
699 }
700
701 static void
adhoc_recv_mgmt(struct ieee80211_node * ni,struct mbuf * m0,int subtype,const struct ieee80211_rx_stats * rxs,int rssi,int nf)702 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
703 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
704 {
705 struct ieee80211vap *vap = ni->ni_vap;
706 struct ieee80211com *ic = ni->ni_ic;
707 struct ieee80211_channel *rxchan = ic->ic_curchan;
708 struct ieee80211_frame *wh;
709 uint8_t *frm, *efrm;
710 uint8_t *ssid, *rates, *xrates;
711 #if 0
712 int ht_state_change = 0;
713 #endif
714
715 wh = mtod(m0, struct ieee80211_frame *);
716 frm = (uint8_t *)&wh[1];
717 efrm = mtod(m0, uint8_t *) + m0->m_len;
718
719 IEEE80211_DPRINTF(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_DEBUG,
720 "%s: recv mgmt frame, addr2=%6D, ni=%p (%6D) fc=%.02x %.02x\n",
721 __func__,
722 wh->i_addr2, ":",
723 ni,
724 ni->ni_macaddr, ":",
725 wh->i_fc[0],
726 wh->i_fc[1]);
727 switch (subtype) {
728 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
729 case IEEE80211_FC0_SUBTYPE_BEACON: {
730 struct ieee80211_scanparams scan;
731 struct ieee80211_channel *c;
732 /*
733 * We process beacon/probe response
734 * frames to discover neighbors.
735 */
736 if (rxs != NULL) {
737 c = ieee80211_lookup_channel_rxstatus(vap, rxs);
738 if (c != NULL)
739 rxchan = c;
740 }
741 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0)
742 return;
743 /*
744 * Count frame now that we know it's to be processed.
745 */
746 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
747 vap->iv_stats.is_rx_beacon++; /* XXX remove */
748 IEEE80211_NODE_STAT(ni, rx_beacons);
749 } else
750 IEEE80211_NODE_STAT(ni, rx_proberesp);
751 /*
752 * If scanning, just pass information to the scan module.
753 */
754 if (ic->ic_flags & IEEE80211_F_SCAN) {
755 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
756 /*
757 * Actively scanning a channel marked passive;
758 * send a probe request now that we know there
759 * is 802.11 traffic present.
760 *
761 * XXX check if the beacon we recv'd gives
762 * us what we need and suppress the probe req
763 */
764 ieee80211_probe_curchan(vap, true);
765 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
766 }
767 ieee80211_add_scan(vap, rxchan, &scan, wh,
768 subtype, rssi, nf);
769 return;
770 }
771 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
772 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
773 /*
774 * Create a new entry in the neighbor table.
775 *
776 * XXX TODO:
777 *
778 * Here we're not scanning; so if we have an
779 * SSID then make sure it matches our SSID.
780 * Otherwise this code will match on all IBSS
781 * beacons/probe requests for all SSIDs,
782 * filling the node table with nodes that
783 * aren't ours.
784 */
785 if (ieee80211_ibss_node_check_new(ni, &scan)) {
786 ni = ieee80211_add_neighbor(vap, wh, &scan);
787 /*
788 * Send a probe request so we announce 11n
789 * capabilities.
790 */
791 ieee80211_send_probereq(ni, /* node */
792 vap->iv_myaddr, /* SA */
793 ni->ni_macaddr, /* DA */
794 vap->iv_bss->ni_bssid, /* BSSID */
795 vap->iv_bss->ni_essid,
796 vap->iv_bss->ni_esslen); /* SSID */
797 } else
798 ni = NULL;
799
800 /*
801 * Send a probe request so we announce 11n
802 * capabilities.
803 *
804 * Don't do this if we're scanning.
805 */
806 if (! (ic->ic_flags & IEEE80211_F_SCAN))
807 ieee80211_send_probereq(ni, /* node */
808 vap->iv_myaddr, /* SA */
809 ni->ni_macaddr, /* DA */
810 vap->iv_bss->ni_bssid, /* BSSID */
811 vap->iv_bss->ni_essid,
812 vap->iv_bss->ni_esslen); /* SSID */
813
814 } else if (ni->ni_capinfo == 0) {
815 /*
816 * Update faked node created on transmit.
817 * Note this also updates the tsf.
818 */
819 ieee80211_init_neighbor(ni, wh, &scan);
820
821 /*
822 * Send a probe request so we announce 11n
823 * capabilities.
824 */
825 ieee80211_send_probereq(ni, /* node */
826 vap->iv_myaddr, /* SA */
827 ni->ni_macaddr, /* DA */
828 vap->iv_bss->ni_bssid, /* BSSID */
829 vap->iv_bss->ni_essid,
830 vap->iv_bss->ni_esslen); /* SSID */
831 } else {
832 /*
833 * Record tsf for potential resync.
834 */
835 memcpy(ni->ni_tstamp.data, scan.tstamp,
836 sizeof(ni->ni_tstamp));
837 }
838 /*
839 * This isn't enabled yet - otherwise it would
840 * update the HT parameters and channel width
841 * from any node, which could lead to lots of
842 * strange behaviour if the 11n nodes aren't
843 * exactly configured to match.
844 */
845 #if 0
846 if (scan.htcap != NULL && scan.htinfo != NULL &&
847 (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
848 ieee80211_ht_updateparams(ni,
849 scan.htcap, scan.htinfo));
850 if (ieee80211_ht_updateparams_final(ni,
851 scan.htcap, scan.htinfo))
852 ht_state_change = 1;
853 }
854
855 /* XXX same for VHT? */
856 #endif
857 if (ni != NULL) {
858 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
859 ni->ni_noise = nf;
860 }
861 /*
862 * Same here - the channel width change should
863 * be applied to the specific peer node, not
864 * to the ic. Ie, the interface configuration
865 * should stay in its current channel width;
866 * but it should change the rate control and
867 * any queued frames for the given node only.
868 *
869 * Since there's no (current) way to inform
870 * the driver that a channel width change has
871 * occurred for a single node, just stub this
872 * out.
873 */
874 #if 0
875 if (ht_state_change)
876 ieee80211_update_chw(ic);
877 #endif
878 }
879 break;
880 }
881
882 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
883 if (vap->iv_state != IEEE80211_S_RUN) {
884 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
885 wh, NULL, "wrong state %s",
886 ieee80211_state_name[vap->iv_state]);
887 vap->iv_stats.is_rx_mgtdiscard++;
888 return;
889 }
890 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
891 /* frame must be directed */
892 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
893 wh, NULL, "%s", "not unicast");
894 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */
895 return;
896 }
897
898 /*
899 * prreq frame format
900 * [tlv] ssid
901 * [tlv] supported rates
902 * [tlv] extended supported rates
903 */
904 ssid = rates = xrates = NULL;
905 while (efrm - frm > 1) {
906 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
907 switch (*frm) {
908 case IEEE80211_ELEMID_SSID:
909 ssid = frm;
910 break;
911 case IEEE80211_ELEMID_RATES:
912 rates = frm;
913 break;
914 case IEEE80211_ELEMID_XRATES:
915 xrates = frm;
916 break;
917 }
918 frm += frm[1] + 2;
919 }
920 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
921 if (xrates != NULL)
922 IEEE80211_VERIFY_ELEMENT(xrates,
923 IEEE80211_RATE_MAXSIZE - rates[1], return);
924 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
925 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
926 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
927 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
928 wh, NULL,
929 "%s", "no ssid with ssid suppression enabled");
930 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
931 return;
932 }
933
934 /* XXX find a better class or define it's own */
935 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
936 "%s", "recv probe req");
937 /*
938 * Some legacy 11b clients cannot hack a complete
939 * probe response frame. When the request includes
940 * only a bare-bones rate set, communicate this to
941 * the transmit side.
942 */
943 ieee80211_send_proberesp(vap, wh->i_addr2,
944 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
945
946 /*
947 * Note: we don't benefit from stashing the probe request
948 * IEs away to use for IBSS negotiation, because we
949 * typically don't get all of the IEs.
950 */
951 break;
952
953 case IEEE80211_FC0_SUBTYPE_ACTION:
954 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
955 if ((ni == vap->iv_bss) &&
956 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
957 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
958 wh, NULL, "%s", "unknown node");
959 vap->iv_stats.is_rx_mgtdiscard++;
960 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
961 !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
962 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_DEBUG,
963 wh, NULL, "%s", "not for us");
964 vap->iv_stats.is_rx_mgtdiscard++;
965 } else if (vap->iv_state != IEEE80211_S_RUN) {
966 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_DEBUG,
967 wh, NULL, "wrong state %s",
968 ieee80211_state_name[vap->iv_state]);
969 vap->iv_stats.is_rx_mgtdiscard++;
970 } else {
971 if (ieee80211_parse_action(ni, m0) == 0)
972 (void)ic->ic_recv_action(ni, wh, frm, efrm);
973 }
974 break;
975
976 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
977 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
978 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
979 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
980 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
981 case IEEE80211_FC0_SUBTYPE_ATIM:
982 case IEEE80211_FC0_SUBTYPE_DISASSOC:
983 case IEEE80211_FC0_SUBTYPE_AUTH:
984 case IEEE80211_FC0_SUBTYPE_DEAUTH:
985 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
986 wh, NULL, "%s", "not handled");
987 vap->iv_stats.is_rx_mgtdiscard++;
988 break;
989
990 default:
991 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
992 wh, "mgt", "subtype 0x%x not handled", subtype);
993 vap->iv_stats.is_rx_badsubtype++;
994 break;
995 }
996 }
997 #undef IEEE80211_VERIFY_LENGTH
998 #undef IEEE80211_VERIFY_ELEMENT
999
1000 static void
ahdemo_recv_mgmt(struct ieee80211_node * ni,struct mbuf * m0,int subtype,const struct ieee80211_rx_stats * rxs,int rssi,int nf)1001 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1002 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
1003 {
1004 struct ieee80211vap *vap = ni->ni_vap;
1005 struct ieee80211com *ic = ni->ni_ic;
1006
1007 /*
1008 * Process management frames when scanning; useful for doing
1009 * a site-survey.
1010 */
1011 if (ic->ic_flags & IEEE80211_F_SCAN)
1012 adhoc_recv_mgmt(ni, m0, subtype, rxs, rssi, nf);
1013 else {
1014 #ifdef IEEE80211_DEBUG
1015 struct ieee80211_frame *wh;
1016
1017 wh = mtod(m0, struct ieee80211_frame *);
1018 #endif
1019 switch (subtype) {
1020 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1021 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1022 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
1023 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
1024 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1025 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1026 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
1027 case IEEE80211_FC0_SUBTYPE_BEACON:
1028 case IEEE80211_FC0_SUBTYPE_ATIM:
1029 case IEEE80211_FC0_SUBTYPE_DISASSOC:
1030 case IEEE80211_FC0_SUBTYPE_AUTH:
1031 case IEEE80211_FC0_SUBTYPE_DEAUTH:
1032 case IEEE80211_FC0_SUBTYPE_ACTION:
1033 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
1034 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1035 wh, NULL, "%s", "not handled");
1036 vap->iv_stats.is_rx_mgtdiscard++;
1037 break;
1038 default:
1039 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1040 wh, "mgt", "subtype 0x%x not handled", subtype);
1041 vap->iv_stats.is_rx_badsubtype++;
1042 break;
1043 }
1044 }
1045 }
1046
1047 static void
adhoc_recv_ctl(struct ieee80211_node * ni,struct mbuf * m,int subtype)1048 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
1049 {
1050
1051 switch (subtype) {
1052 case IEEE80211_FC0_SUBTYPE_BAR:
1053 ieee80211_recv_bar(ni, m);
1054 break;
1055 }
1056 }
1057