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/ethernet.h>
52
53 #include <net/bpf.h>
54
55 #include <net80211/ieee80211_var.h>
56 #include <net80211/ieee80211_adhoc.h>
57 #include <net80211/ieee80211_input.h>
58 #ifdef IEEE80211_SUPPORT_SUPERG
59 #include <net80211/ieee80211_superg.h>
60 #endif
61 #ifdef IEEE80211_SUPPORT_TDMA
62 #include <net80211/ieee80211_tdma.h>
63 #endif
64 #include <net80211/ieee80211_sta.h>
65
66 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2)
67
68 static void adhoc_vattach(struct ieee80211vap *);
69 static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int);
70 static int adhoc_input(struct ieee80211_node *, struct mbuf *,
71 const struct ieee80211_rx_stats *, int, int);
72 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *,
73 int subtype, const struct ieee80211_rx_stats *, int, int);
74 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *,
75 int subtype, const struct ieee80211_rx_stats *rxs, int, int);
76 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
77
78 void
ieee80211_adhoc_attach(struct ieee80211com * ic)79 ieee80211_adhoc_attach(struct ieee80211com *ic)
80 {
81 ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach;
82 ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach;
83 }
84
85 void
ieee80211_adhoc_detach(struct ieee80211com * ic)86 ieee80211_adhoc_detach(struct ieee80211com *ic)
87 {
88 }
89
90 static void
adhoc_vdetach(struct ieee80211vap * vap)91 adhoc_vdetach(struct ieee80211vap *vap)
92 {
93 }
94
95 static void
adhoc_vattach(struct ieee80211vap * vap)96 adhoc_vattach(struct ieee80211vap *vap)
97 {
98 vap->iv_newstate = adhoc_newstate;
99 vap->iv_input = adhoc_input;
100 if (vap->iv_opmode == IEEE80211_M_IBSS)
101 vap->iv_recv_mgmt = adhoc_recv_mgmt;
102 else
103 vap->iv_recv_mgmt = ahdemo_recv_mgmt;
104 vap->iv_recv_ctl = adhoc_recv_ctl;
105 vap->iv_opdetach = adhoc_vdetach;
106 #ifdef IEEE80211_SUPPORT_TDMA
107 /*
108 * Throw control to tdma support. Note we do this
109 * after setting up our callbacks so it can piggyback
110 * on top of us.
111 */
112 if (vap->iv_caps & IEEE80211_C_TDMA)
113 ieee80211_tdma_vattach(vap);
114 #endif
115 }
116
117 static void
sta_leave(void * arg,struct ieee80211_node * ni)118 sta_leave(void *arg, struct ieee80211_node *ni)
119 {
120 struct ieee80211vap *vap = ni->ni_vap;
121
122 if (ni != vap->iv_bss)
123 ieee80211_node_leave(ni);
124 }
125
126 /*
127 * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler.
128 */
129 static int
adhoc_newstate(struct ieee80211vap * vap,enum ieee80211_state nstate,int arg)130 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
131 {
132 struct ieee80211com *ic = vap->iv_ic;
133 struct ieee80211_node *ni;
134 enum ieee80211_state ostate;
135
136 IEEE80211_LOCK_ASSERT(vap->iv_ic);
137
138 ostate = vap->iv_state;
139 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
140 __func__, ieee80211_state_name[ostate],
141 ieee80211_state_name[nstate], arg);
142 vap->iv_state = nstate; /* state transition */
143 if (ostate != IEEE80211_S_SCAN)
144 ieee80211_cancel_scan(vap); /* background scan */
145 ni = vap->iv_bss; /* NB: no reference held */
146 switch (nstate) {
147 case IEEE80211_S_INIT:
148 switch (ostate) {
149 case IEEE80211_S_SCAN:
150 ieee80211_cancel_scan(vap);
151 break;
152 default:
153 break;
154 }
155 if (ostate != IEEE80211_S_INIT) {
156 /* NB: optimize INIT -> INIT case */
157 ieee80211_reset_bss(vap);
158 }
159 break;
160 case IEEE80211_S_SCAN:
161 switch (ostate) {
162 case IEEE80211_S_RUN: /* beacon miss */
163 /* purge station table; entries are stale */
164 ieee80211_iterate_nodes_vap(&ic->ic_sta, vap,
165 sta_leave, NULL);
166 /* fall thru... */
167 case IEEE80211_S_INIT:
168 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
169 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
170 /*
171 * Already have a channel; bypass the
172 * scan and startup immediately.
173 */
174 ieee80211_create_ibss(vap,
175 ieee80211_ht_adjust_channel(ic,
176 vap->iv_des_chan, vap->iv_flags_ht));
177 break;
178 }
179 /*
180 * Initiate a scan. We can come here as a result
181 * of an IEEE80211_IOC_SCAN_REQ too in which case
182 * the vap will be marked with IEEE80211_FEXT_SCANREQ
183 * and the scan request parameters will be present
184 * in iv_scanreq. Otherwise we do the default.
185 */
186 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
187 ieee80211_check_scan(vap,
188 vap->iv_scanreq_flags,
189 vap->iv_scanreq_duration,
190 vap->iv_scanreq_mindwell,
191 vap->iv_scanreq_maxdwell,
192 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
193 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
194 } else
195 ieee80211_check_scan_current(vap);
196 break;
197 case IEEE80211_S_SCAN:
198 /*
199 * This can happen because of a change in state
200 * that requires a reset. Trigger a new scan
201 * unless we're in manual roaming mode in which
202 * case an application must issue an explicit request.
203 */
204 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
205 ieee80211_check_scan_current(vap);
206 break;
207 default:
208 goto invalid;
209 }
210 break;
211 case IEEE80211_S_RUN:
212 if (vap->iv_flags & IEEE80211_F_WPA) {
213 /* XXX validate prerequisites */
214 }
215 switch (ostate) {
216 case IEEE80211_S_INIT:
217 /*
218 * Already have a channel; bypass the
219 * scan and startup immediately.
220 * Note that ieee80211_create_ibss will call
221 * back to do a RUN->RUN state change.
222 */
223 ieee80211_create_ibss(vap,
224 ieee80211_ht_adjust_channel(ic,
225 ic->ic_curchan, vap->iv_flags_ht));
226 /* NB: iv_bss is changed on return */
227 ni = vap->iv_bss;
228 break;
229 case IEEE80211_S_SCAN:
230 #ifdef IEEE80211_DEBUG
231 if (ieee80211_msg_debug(vap)) {
232 ieee80211_note(vap,
233 "synchronized with %s ssid ",
234 ether_sprintf(ni->ni_bssid));
235 ieee80211_print_essid(vap->iv_bss->ni_essid,
236 ni->ni_esslen);
237 net80211_printf(" channel %d start %uMbit/s\n",
238 ieee80211_chan2ieee(ic, ic->ic_curchan),
239 ieee80211_node_get_txrate_kbit(ni) / 1000);
240 }
241 #endif
242 break;
243 case IEEE80211_S_RUN: /* IBSS merge */
244 break;
245 default:
246 goto invalid;
247 }
248 /*
249 * When 802.1x is not in use mark the port authorized
250 * at this point so traffic can flow.
251 */
252 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
253 ieee80211_node_authorize(ni);
254 /*
255 * Fake association when joining an existing bss.
256 */
257 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) &&
258 ic->ic_newassoc != NULL)
259 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN);
260 break;
261 case IEEE80211_S_SLEEP:
262 vap->iv_sta_ps(vap, 0);
263 break;
264 default:
265 invalid:
266 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
267 "%s: unexpected state transition %s -> %s\n", __func__,
268 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
269 break;
270 }
271 return 0;
272 }
273
274 /*
275 * Decide if a received management frame should be
276 * printed when debugging is enabled. This filters some
277 * of the less interesting frames that come frequently
278 * (e.g. beacons).
279 */
280 static __inline int
doprint(struct ieee80211vap * vap,int subtype)281 doprint(struct ieee80211vap *vap, int subtype)
282 {
283 switch (subtype) {
284 case IEEE80211_FC0_SUBTYPE_BEACON:
285 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
286 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
287 return 1;
288 }
289 return 1;
290 }
291
292 /*
293 * Process a received frame. The node associated with the sender
294 * should be supplied. If nothing was found in the node table then
295 * the caller is assumed to supply a reference to iv_bss instead.
296 * The RSSI and a timestamp are also supplied. The RSSI data is used
297 * during AP scanning to select a AP to associate with; it can have
298 * any units so long as values have consistent units and higher values
299 * mean ``better signal''. The receive timestamp is currently not used
300 * by the 802.11 layer.
301 */
302 static int
adhoc_input(struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_rx_stats * rxs,int rssi,int nf)303 adhoc_input(struct ieee80211_node *ni, struct mbuf *m,
304 const struct ieee80211_rx_stats *rxs, int rssi, int nf)
305 {
306 struct ieee80211vap *vap = ni->ni_vap;
307 struct ieee80211com *ic = ni->ni_ic;
308 struct ifnet *ifp = vap->iv_ifp;
309 struct ieee80211_frame *wh;
310 struct ieee80211_key *key;
311 struct ether_header *eh;
312 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
313 uint8_t dir, type, subtype, qos;
314 uint8_t *bssid;
315 int is_hw_decrypted = 0;
316 int has_decrypted = 0;
317
318 /*
319 * Some devices do hardware decryption all the way through
320 * to pretending the frame wasn't encrypted in the first place.
321 * So, tag it appropriately so it isn't discarded inappropriately.
322 */
323 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED))
324 is_hw_decrypted = 1;
325
326 if (m->m_flags & M_AMPDU_MPDU) {
327 /*
328 * Fastpath for A-MPDU reorder q resubmission. Frames
329 * w/ M_AMPDU_MPDU marked have already passed through
330 * here but were received out of order and been held on
331 * the reorder queue. When resubmitted they are marked
332 * with the M_AMPDU_MPDU flag and we can bypass most of
333 * the normal processing.
334 */
335 wh = mtod(m, struct ieee80211_frame *);
336 type = IEEE80211_FC0_TYPE_DATA;
337 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
338 subtype = IEEE80211_FC0_SUBTYPE_QOS_DATA;
339 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
340 goto resubmit_ampdu;
341 }
342
343 KASSERT(ni != NULL, ("null node"));
344 ni->ni_inact = ni->ni_inact_reload;
345
346 type = -1; /* undefined */
347
348 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
349 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
350 ni->ni_macaddr, NULL,
351 "too short (1): len %u", m->m_pkthdr.len);
352 vap->iv_stats.is_rx_tooshort++;
353 goto out;
354 }
355 /*
356 * Bit of a cheat here, we use a pointer for a 3-address
357 * frame format but don't reference fields past outside
358 * ieee80211_frame_min w/o first validating the data is
359 * present.
360 */
361 wh = mtod(m, struct ieee80211_frame *);
362
363 if (!IEEE80211_IS_FC0_CHECK_VER(wh, IEEE80211_FC0_VERSION_0)) {
364 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
365 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
366 wh->i_fc[0], wh->i_fc[1]);
367 vap->iv_stats.is_rx_badversion++;
368 goto err;
369 }
370
371 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
372 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
373 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
374 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
375 if (dir != IEEE80211_FC1_DIR_NODS)
376 bssid = wh->i_addr1;
377 else if (type == IEEE80211_FC0_TYPE_CTL)
378 bssid = wh->i_addr1;
379 else {
380 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
381 IEEE80211_DISCARD_MAC(vap,
382 IEEE80211_MSG_ANY, ni->ni_macaddr,
383 NULL, "too short (2): len %u",
384 m->m_pkthdr.len);
385 vap->iv_stats.is_rx_tooshort++;
386 goto out;
387 }
388 bssid = wh->i_addr3;
389 }
390 /*
391 * Validate the bssid.
392 */
393 if (!(type == IEEE80211_FC0_TYPE_MGT &&
394 (subtype == IEEE80211_FC0_SUBTYPE_BEACON ||
395 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)) &&
396 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
397 !IEEE80211_ADDR_EQ(bssid,
398 ieee80211_vap_get_broadcast_address(vap))) {
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 net80211_vap_printf(vap,
648 "received %s from %s rssi %d\n",
649 ieee80211_mgt_subtype_name(subtype),
650 ether_sprintf(wh->i_addr2), rssi);
651 }
652 #endif
653 if (IEEE80211_IS_PROTECTED(wh)) {
654 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
655 wh, NULL, "%s", "WEP set but not permitted");
656 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
657 goto out;
658 }
659 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
660 goto out;
661
662 case IEEE80211_FC0_TYPE_CTL:
663 vap->iv_stats.is_rx_ctl++;
664 IEEE80211_NODE_STAT(ni, rx_ctrl);
665 if (ieee80211_is_ctl_frame_for_vap(ni, m))
666 vap->iv_recv_ctl(ni, m, subtype);
667 goto out;
668
669 default:
670 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
671 wh, "bad", "frame type 0x%x", type);
672 /* should not come here */
673 break;
674 }
675 err:
676 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
677 out:
678 if (m != NULL) {
679 if (need_tap && ieee80211_radiotap_active_vap(vap))
680 ieee80211_radiotap_rx(vap, m);
681 m_freem(m);
682 }
683 return type;
684 }
685
686 static int
is11bclient(const uint8_t * rates,const uint8_t * xrates)687 is11bclient(const uint8_t *rates, const uint8_t *xrates)
688 {
689 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
690 int i;
691
692 /* NB: the 11b clients we care about will not have xrates */
693 if (xrates != NULL || rates == NULL)
694 return 0;
695 for (i = 0; i < rates[1]; i++) {
696 int r = rates[2+i] & IEEE80211_RATE_VAL;
697 if (r > 2*11 || ((1<<r) & brates) == 0)
698 return 0;
699 }
700 return 1;
701 }
702
703 static void
adhoc_recv_mgmt(struct ieee80211_node * ni,struct mbuf * m0,int subtype,const struct ieee80211_rx_stats * rxs,int rssi,int nf)704 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
705 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
706 {
707 struct ieee80211vap *vap = ni->ni_vap;
708 struct ieee80211com *ic = ni->ni_ic;
709 struct ieee80211_channel *rxchan = ic->ic_curchan;
710 struct ieee80211_frame *wh;
711 uint8_t *frm, *efrm;
712 uint8_t *ssid, *rates, *xrates;
713 #if 0
714 int ht_state_change = 0;
715 #endif
716
717 wh = mtod(m0, struct ieee80211_frame *);
718 frm = (uint8_t *)&wh[1];
719 efrm = mtod(m0, uint8_t *) + m0->m_len;
720
721 IEEE80211_DPRINTF(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_DEBUG,
722 "%s: recv mgmt frame, addr2=%6D, ni=%p (%6D) fc=%.02x %.02x\n",
723 __func__,
724 wh->i_addr2, ":",
725 ni,
726 ni->ni_macaddr, ":",
727 wh->i_fc[0],
728 wh->i_fc[1]);
729 switch (subtype) {
730 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
731 case IEEE80211_FC0_SUBTYPE_BEACON: {
732 struct ieee80211_scanparams scan;
733 struct ieee80211_channel *c;
734 /*
735 * We process beacon/probe response
736 * frames to discover neighbors.
737 */
738 if (rxs != NULL) {
739 c = ieee80211_lookup_channel_rxstatus(vap, rxs);
740 if (c != NULL)
741 rxchan = c;
742 }
743 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0)
744 return;
745 /*
746 * Count frame now that we know it's to be processed.
747 */
748 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
749 vap->iv_stats.is_rx_beacon++; /* XXX remove */
750 IEEE80211_NODE_STAT(ni, rx_beacons);
751 } else
752 IEEE80211_NODE_STAT(ni, rx_proberesp);
753 /*
754 * If scanning, just pass information to the scan module.
755 */
756 if (ic->ic_flags & IEEE80211_F_SCAN) {
757 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
758 /*
759 * Actively scanning a channel marked passive;
760 * send a probe request now that we know there
761 * is 802.11 traffic present.
762 *
763 * XXX check if the beacon we recv'd gives
764 * us what we need and suppress the probe req
765 */
766 ieee80211_probe_curchan(vap, true);
767 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
768 }
769 ieee80211_add_scan(vap, rxchan, &scan, wh,
770 subtype, rssi, nf);
771 return;
772 }
773 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
774 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
775 /*
776 * Create a new entry in the neighbor table.
777 *
778 * XXX TODO:
779 *
780 * Here we're not scanning; so if we have an
781 * SSID then make sure it matches our SSID.
782 * Otherwise this code will match on all IBSS
783 * beacons/probe requests for all SSIDs,
784 * filling the node table with nodes that
785 * aren't ours.
786 */
787 if (ieee80211_ibss_node_check_new(ni, &scan)) {
788 ni = ieee80211_add_neighbor(vap, wh, &scan);
789 /*
790 * Send a probe request so we announce 11n
791 * capabilities.
792 */
793 ieee80211_send_probereq(ni, /* node */
794 vap->iv_myaddr, /* SA */
795 ni->ni_macaddr, /* DA */
796 vap->iv_bss->ni_bssid, /* BSSID */
797 vap->iv_bss->ni_essid,
798 vap->iv_bss->ni_esslen); /* SSID */
799 } else
800 ni = NULL;
801
802 /*
803 * Send a probe request so we announce 11n
804 * capabilities.
805 *
806 * Don't do this if we're scanning.
807 */
808 if (! (ic->ic_flags & IEEE80211_F_SCAN))
809 ieee80211_send_probereq(ni, /* node */
810 vap->iv_myaddr, /* SA */
811 ni->ni_macaddr, /* DA */
812 vap->iv_bss->ni_bssid, /* BSSID */
813 vap->iv_bss->ni_essid,
814 vap->iv_bss->ni_esslen); /* SSID */
815
816 } else if (ni->ni_capinfo == 0) {
817 /*
818 * Update faked node created on transmit.
819 * Note this also updates the tsf.
820 */
821 ieee80211_init_neighbor(ni, wh, &scan);
822
823 /*
824 * Send a probe request so we announce 11n
825 * capabilities.
826 */
827 ieee80211_send_probereq(ni, /* node */
828 vap->iv_myaddr, /* SA */
829 ni->ni_macaddr, /* DA */
830 vap->iv_bss->ni_bssid, /* BSSID */
831 vap->iv_bss->ni_essid,
832 vap->iv_bss->ni_esslen); /* SSID */
833 } else {
834 /*
835 * Record tsf for potential resync.
836 */
837 memcpy(ni->ni_tstamp.data, scan.tstamp,
838 sizeof(ni->ni_tstamp));
839 }
840 /*
841 * This isn't enabled yet - otherwise it would
842 * update the HT parameters and channel width
843 * from any node, which could lead to lots of
844 * strange behaviour if the 11n nodes aren't
845 * exactly configured to match.
846 */
847 #if 0
848 if (scan.htcap != NULL && scan.htinfo != NULL &&
849 (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
850 ieee80211_ht_updateparams(ni,
851 scan.htcap, scan.htinfo));
852 if (ieee80211_ht_updateparams_final(ni,
853 scan.htcap, scan.htinfo))
854 ht_state_change = 1;
855 }
856
857 /* XXX same for VHT? */
858 #endif
859 if (ni != NULL) {
860 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
861 ni->ni_noise = nf;
862 }
863 /*
864 * Same here - the channel width change should
865 * be applied to the specific peer node, not
866 * to the ic. Ie, the interface configuration
867 * should stay in its current channel width;
868 * but it should change the rate control and
869 * any queued frames for the given node only.
870 *
871 * Since there's no (current) way to inform
872 * the driver that a channel width change has
873 * occurred for a single node, just stub this
874 * out.
875 */
876 #if 0
877 if (ht_state_change)
878 ieee80211_update_chw(ic);
879 #endif
880 }
881 break;
882 }
883
884 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
885 if (vap->iv_state != IEEE80211_S_RUN) {
886 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
887 wh, NULL, "wrong state %s",
888 ieee80211_state_name[vap->iv_state]);
889 vap->iv_stats.is_rx_mgtdiscard++;
890 return;
891 }
892 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
893 /* frame must be directed */
894 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
895 wh, NULL, "%s", "not unicast");
896 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */
897 return;
898 }
899
900 /*
901 * prreq frame format
902 * [tlv] ssid
903 * [tlv] supported rates
904 * [tlv] extended supported rates
905 */
906 ssid = rates = xrates = NULL;
907 while (efrm - frm > 1) {
908 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
909 switch (*frm) {
910 case IEEE80211_ELEMID_SSID:
911 ssid = frm;
912 break;
913 case IEEE80211_ELEMID_RATES:
914 rates = frm;
915 break;
916 case IEEE80211_ELEMID_XRATES:
917 xrates = frm;
918 break;
919 }
920 frm += frm[1] + 2;
921 }
922 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
923 if (xrates != NULL)
924 IEEE80211_VERIFY_ELEMENT(xrates,
925 IEEE80211_RATE_MAXSIZE - rates[1], return);
926 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
927 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
928 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
929 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
930 wh, NULL,
931 "%s", "no ssid with ssid suppression enabled");
932 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
933 return;
934 }
935
936 /* XXX find a better class or define it's own */
937 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
938 "%s", "recv probe req");
939 /*
940 * Some legacy 11b clients cannot hack a complete
941 * probe response frame. When the request includes
942 * only a bare-bones rate set, communicate this to
943 * the transmit side.
944 */
945 ieee80211_send_proberesp(vap, wh->i_addr2,
946 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
947
948 /*
949 * Note: we don't benefit from stashing the probe request
950 * IEs away to use for IBSS negotiation, because we
951 * typically don't get all of the IEs.
952 */
953 break;
954
955 case IEEE80211_FC0_SUBTYPE_ACTION:
956 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
957 if ((ni == vap->iv_bss) &&
958 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
959 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
960 wh, NULL, "%s", "unknown node");
961 vap->iv_stats.is_rx_mgtdiscard++;
962 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
963 !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
964 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_DEBUG,
965 wh, NULL, "%s", "not for us");
966 vap->iv_stats.is_rx_mgtdiscard++;
967 } else if (vap->iv_state != IEEE80211_S_RUN) {
968 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_DEBUG,
969 wh, NULL, "wrong state %s",
970 ieee80211_state_name[vap->iv_state]);
971 vap->iv_stats.is_rx_mgtdiscard++;
972 } else {
973 if (ieee80211_parse_action(ni, m0) == 0)
974 (void)ic->ic_recv_action(ni, wh, frm, efrm);
975 }
976 break;
977
978 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
979 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
980 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
981 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
982 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
983 case IEEE80211_FC0_SUBTYPE_ATIM:
984 case IEEE80211_FC0_SUBTYPE_DISASSOC:
985 case IEEE80211_FC0_SUBTYPE_AUTH:
986 case IEEE80211_FC0_SUBTYPE_DEAUTH:
987 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
988 wh, NULL, "%s", "not handled");
989 vap->iv_stats.is_rx_mgtdiscard++;
990 break;
991
992 default:
993 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
994 wh, "mgt", "subtype 0x%x not handled", subtype);
995 vap->iv_stats.is_rx_badsubtype++;
996 break;
997 }
998 }
999 #undef IEEE80211_VERIFY_LENGTH
1000 #undef IEEE80211_VERIFY_ELEMENT
1001
1002 static void
ahdemo_recv_mgmt(struct ieee80211_node * ni,struct mbuf * m0,int subtype,const struct ieee80211_rx_stats * rxs,int rssi,int nf)1003 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1004 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
1005 {
1006 struct ieee80211vap *vap = ni->ni_vap;
1007 struct ieee80211com *ic = ni->ni_ic;
1008
1009 /*
1010 * Process management frames when scanning; useful for doing
1011 * a site-survey.
1012 */
1013 if (ic->ic_flags & IEEE80211_F_SCAN)
1014 adhoc_recv_mgmt(ni, m0, subtype, rxs, rssi, nf);
1015 else {
1016 #ifdef IEEE80211_DEBUG
1017 struct ieee80211_frame *wh;
1018
1019 wh = mtod(m0, struct ieee80211_frame *);
1020 #endif
1021 switch (subtype) {
1022 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1023 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1024 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
1025 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
1026 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1027 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1028 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
1029 case IEEE80211_FC0_SUBTYPE_BEACON:
1030 case IEEE80211_FC0_SUBTYPE_ATIM:
1031 case IEEE80211_FC0_SUBTYPE_DISASSOC:
1032 case IEEE80211_FC0_SUBTYPE_AUTH:
1033 case IEEE80211_FC0_SUBTYPE_DEAUTH:
1034 case IEEE80211_FC0_SUBTYPE_ACTION:
1035 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
1036 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1037 wh, NULL, "%s", "not handled");
1038 vap->iv_stats.is_rx_mgtdiscard++;
1039 break;
1040 default:
1041 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1042 wh, "mgt", "subtype 0x%x not handled", subtype);
1043 vap->iv_stats.is_rx_badsubtype++;
1044 break;
1045 }
1046 }
1047 }
1048
1049 static void
adhoc_recv_ctl(struct ieee80211_node * ni,struct mbuf * m,int subtype)1050 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
1051 {
1052
1053 switch (subtype) {
1054 case IEEE80211_FC0_SUBTYPE_BAR:
1055 ieee80211_recv_bar(ni, m);
1056 break;
1057 }
1058 }
1059