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
ieee80211_adhoc_attach(struct ieee80211com * ic)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
ieee80211_adhoc_detach(struct ieee80211com * ic)91 ieee80211_adhoc_detach(struct ieee80211com *ic)
92 {
93 }
94
95 static void
adhoc_vdetach(struct ieee80211vap * vap)96 adhoc_vdetach(struct ieee80211vap *vap)
97 {
98 }
99
100 static void
adhoc_vattach(struct ieee80211vap * vap)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
sta_leave(void * arg,struct ieee80211_node * ni)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
adhoc_newstate(struct ieee80211vap * vap,enum ieee80211_state nstate,int arg)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
doprint(struct ieee80211vap * vap,int subtype)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
adhoc_input(struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_rx_stats * rxs,int rssi,int nf)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;
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)
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);
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);
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 eh = mtod(m, struct ether_header *);
575 if (!ieee80211_node_is_authorized(ni)) {
576 /*
577 * Deny any non-PAE frames received prior to
578 * authorization. For open/shared-key
579 * authentication the port is mark authorized
580 * after authentication completes. For 802.1x
581 * the port is not marked authorized by the
582 * authenticator until the handshake has completed.
583 */
584 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
585 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
586 eh->ether_shost, "data",
587 "unauthorized port: ether type 0x%x len %u",
588 eh->ether_type, m->m_pkthdr.len);
589 vap->iv_stats.is_rx_unauth++;
590 IEEE80211_NODE_STAT(ni, rx_unauth);
591 goto err;
592 }
593 } else {
594 /*
595 * When denying unencrypted frames, discard
596 * any non-PAE frames received without encryption.
597 */
598 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
599 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
600 (is_hw_decrypted == 0) &&
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 (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
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, 1);
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 struct ieee80211_frame *wh;
1007
1008 /*
1009 * Process management frames when scanning; useful for doing
1010 * a site-survey.
1011 */
1012 if (ic->ic_flags & IEEE80211_F_SCAN)
1013 adhoc_recv_mgmt(ni, m0, subtype, rxs, rssi, nf);
1014 else {
1015 wh = mtod(m0, struct ieee80211_frame *);
1016 switch (subtype) {
1017 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1018 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1019 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
1020 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
1021 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1022 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1023 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
1024 case IEEE80211_FC0_SUBTYPE_BEACON:
1025 case IEEE80211_FC0_SUBTYPE_ATIM:
1026 case IEEE80211_FC0_SUBTYPE_DISASSOC:
1027 case IEEE80211_FC0_SUBTYPE_AUTH:
1028 case IEEE80211_FC0_SUBTYPE_DEAUTH:
1029 case IEEE80211_FC0_SUBTYPE_ACTION:
1030 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
1031 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1032 wh, NULL, "%s", "not handled");
1033 vap->iv_stats.is_rx_mgtdiscard++;
1034 break;
1035 default:
1036 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1037 wh, "mgt", "subtype 0x%x not handled", subtype);
1038 vap->iv_stats.is_rx_badsubtype++;
1039 break;
1040 }
1041 }
1042 }
1043
1044 static void
adhoc_recv_ctl(struct ieee80211_node * ni,struct mbuf * m,int subtype)1045 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
1046 {
1047
1048 switch (subtype) {
1049 case IEEE80211_FC0_SUBTYPE_BAR:
1050 ieee80211_recv_bar(ni, m);
1051 break;
1052 }
1053 }
1054