1 /*-
2 * Copyright (c) 2007-2009 Sam Leffler, Errno Consulting
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include <sys/cdefs.h>
27 #ifdef __FreeBSD__
28 __FBSDID("$FreeBSD$");
29 #endif
30
31 /*
32 * IEEE 802.11 IBSS mode support.
33 */
34 #include "opt_inet.h"
35 #include "opt_wlan.h"
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/mbuf.h>
40 #include <sys/malloc.h>
41 #include <sys/kernel.h>
42
43 #include <sys/socket.h>
44 #include <sys/sockio.h>
45 #include <sys/endian.h>
46 #include <sys/errno.h>
47 #include <sys/proc.h>
48 #include <sys/sysctl.h>
49
50 #include <net/if.h>
51 #include <net/if_var.h>
52 #include <net/if_media.h>
53 #include <net/if_llc.h>
54 #include <net/ethernet.h>
55
56 #include <net/bpf.h>
57
58 #include <netproto/802_11/ieee80211_var.h>
59 #include <netproto/802_11/ieee80211_adhoc.h>
60 #include <netproto/802_11/ieee80211_input.h>
61 #ifdef IEEE80211_SUPPORT_SUPERG
62 #include <netproto/802_11/ieee80211_superg.h>
63 #endif
64 #ifdef IEEE80211_SUPPORT_TDMA
65 #include <netproto/802_11/ieee80211_tdma.h>
66 #endif
67 #include <netproto/802_11/ieee80211_sta.h>
68
69 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2)
70
71 static void adhoc_vattach(struct ieee80211vap *);
72 static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int);
73 static int adhoc_input(struct ieee80211_node *, struct mbuf *,
74 const struct ieee80211_rx_stats *, int, int);
75 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *,
76 int subtype, const struct ieee80211_rx_stats *, int, int);
77 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *,
78 int subtype, const struct ieee80211_rx_stats *rxs, int, int);
79 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
80
81 void
ieee80211_adhoc_attach(struct ieee80211com * ic)82 ieee80211_adhoc_attach(struct ieee80211com *ic)
83 {
84 ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach;
85 ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach;
86 }
87
88 void
ieee80211_adhoc_detach(struct ieee80211com * ic)89 ieee80211_adhoc_detach(struct ieee80211com *ic)
90 {
91 }
92
93 static void
adhoc_vdetach(struct ieee80211vap * vap)94 adhoc_vdetach(struct ieee80211vap *vap)
95 {
96 }
97
98 static void
adhoc_vattach(struct ieee80211vap * vap)99 adhoc_vattach(struct ieee80211vap *vap)
100 {
101 vap->iv_newstate = adhoc_newstate;
102 vap->iv_input = adhoc_input;
103 if (vap->iv_opmode == IEEE80211_M_IBSS)
104 vap->iv_recv_mgmt = adhoc_recv_mgmt;
105 else
106 vap->iv_recv_mgmt = ahdemo_recv_mgmt;
107 vap->iv_recv_ctl = adhoc_recv_ctl;
108 vap->iv_opdetach = adhoc_vdetach;
109 #ifdef IEEE80211_SUPPORT_TDMA
110 /*
111 * Throw control to tdma support. Note we do this
112 * after setting up our callbacks so it can piggyback
113 * on top of us.
114 */
115 if (vap->iv_caps & IEEE80211_C_TDMA)
116 ieee80211_tdma_vattach(vap);
117 #endif
118 }
119
120 static void
sta_leave(void * arg,struct ieee80211_node * ni)121 sta_leave(void *arg, struct ieee80211_node *ni)
122 {
123 struct ieee80211vap *vap = arg;
124
125 if (ni->ni_vap == vap && ni != vap->iv_bss)
126 ieee80211_node_leave(ni);
127 }
128
129 /*
130 * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler.
131 */
132 static int
adhoc_newstate(struct ieee80211vap * vap,enum ieee80211_state nstate,int arg)133 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
134 {
135 struct ieee80211com *ic = vap->iv_ic;
136 struct ieee80211_node *ni;
137 enum ieee80211_state ostate;
138
139 IEEE80211_LOCK_ASSERT(vap->iv_ic);
140
141 ostate = vap->iv_state;
142 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
143 __func__, ieee80211_state_name[ostate],
144 ieee80211_state_name[nstate], arg);
145 vap->iv_state = nstate; /* state transition */
146 if (ostate != IEEE80211_S_SCAN)
147 ieee80211_cancel_scan(vap); /* background scan */
148 ni = vap->iv_bss; /* NB: no reference held */
149 switch (nstate) {
150 case IEEE80211_S_INIT:
151 switch (ostate) {
152 case IEEE80211_S_SCAN:
153 ieee80211_cancel_scan(vap);
154 break;
155 default:
156 break;
157 }
158 if (ostate != IEEE80211_S_INIT) {
159 /* NB: optimize INIT -> INIT case */
160 ieee80211_reset_bss(vap);
161 }
162 break;
163 case IEEE80211_S_SCAN:
164 switch (ostate) {
165 case IEEE80211_S_RUN: /* beacon miss */
166 /* purge station table; entries are stale */
167 ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap);
168 /* fall thru... */
169 case IEEE80211_S_INIT:
170 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
171 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
172 /*
173 * Already have a channel; bypass the
174 * scan and startup immediately.
175 */
176 ieee80211_create_ibss(vap,
177 ieee80211_ht_adjust_channel(ic,
178 vap->iv_des_chan, vap->iv_flags_ht));
179 break;
180 }
181 /*
182 * Initiate a scan. We can come here as a result
183 * of an IEEE80211_IOC_SCAN_REQ too in which case
184 * the vap will be marked with IEEE80211_FEXT_SCANREQ
185 * and the scan request parameters will be present
186 * in iv_scanreq. Otherwise we do the default.
187 */
188 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
189 ieee80211_check_scan(vap,
190 vap->iv_scanreq_flags,
191 vap->iv_scanreq_duration,
192 vap->iv_scanreq_mindwell,
193 vap->iv_scanreq_maxdwell,
194 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
195 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
196 } else
197 ieee80211_check_scan_current(vap);
198 break;
199 case IEEE80211_S_SCAN:
200 /*
201 * This can happen because of a change in state
202 * that requires a reset. Trigger a new scan
203 * unless we're in manual roaming mode in which
204 * case an application must issue an explicit request.
205 */
206 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
207 ieee80211_check_scan_current(vap);
208 break;
209 default:
210 goto invalid;
211 }
212 break;
213 case IEEE80211_S_RUN:
214 if (vap->iv_flags & IEEE80211_F_WPA) {
215 /* XXX validate prerequisites */
216 }
217 switch (ostate) {
218 case IEEE80211_S_SCAN:
219 #ifdef IEEE80211_DEBUG
220 if (ieee80211_msg_debug(vap)) {
221 ieee80211_note(vap,
222 "synchronized with %s ssid ",
223 ether_sprintf(ni->ni_bssid));
224 ieee80211_print_essid(vap->iv_bss->ni_essid,
225 ni->ni_esslen);
226 /* XXX MCS/HT */
227 kprintf(" channel %d start %uMb\n",
228 ieee80211_chan2ieee(ic, ic->ic_curchan),
229 IEEE80211_RATE2MBS(ni->ni_txrate));
230 }
231 #endif
232 break;
233 case IEEE80211_S_RUN: /* IBSS merge */
234 break;
235 default:
236 goto invalid;
237 }
238 /*
239 * When 802.1x is not in use mark the port authorized
240 * at this point so traffic can flow.
241 */
242 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
243 ieee80211_node_authorize(ni);
244 /*
245 * Fake association when joining an existing bss.
246 */
247 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) &&
248 ic->ic_newassoc != NULL)
249 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN);
250 break;
251 case IEEE80211_S_SLEEP:
252 vap->iv_sta_ps(vap, 0);
253 break;
254 default:
255 invalid:
256 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
257 "%s: unexpected state transition %s -> %s\n", __func__,
258 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
259 break;
260 }
261 return 0;
262 }
263
264 /*
265 * Decide if a received management frame should be
266 * printed when debugging is enabled. This filters some
267 * of the less interesting frames that come frequently
268 * (e.g. beacons).
269 */
270 static __inline int
doprint(struct ieee80211vap * vap,int subtype)271 doprint(struct ieee80211vap *vap, int subtype)
272 {
273 switch (subtype) {
274 case IEEE80211_FC0_SUBTYPE_BEACON:
275 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
276 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
277 return 1;
278 }
279 return 1;
280 }
281
282 /*
283 * Process a received frame. The node associated with the sender
284 * should be supplied. If nothing was found in the node table then
285 * the caller is assumed to supply a reference to iv_bss instead.
286 * The RSSI and a timestamp are also supplied. The RSSI data is used
287 * during AP scanning to select a AP to associate with; it can have
288 * any units so long as values have consistent units and higher values
289 * mean ``better signal''. The receive timestamp is currently not used
290 * by the 802.11 layer.
291 */
292 static int
adhoc_input(struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_rx_stats * rxs,int rssi,int nf)293 adhoc_input(struct ieee80211_node *ni, struct mbuf *m,
294 const struct ieee80211_rx_stats *rxs, int rssi, int nf)
295 {
296 struct ieee80211vap *vap = ni->ni_vap;
297 struct ieee80211com *ic = ni->ni_ic;
298 struct ifnet *ifp = vap->iv_ifp;
299 struct ieee80211_frame *wh;
300 struct ieee80211_key *key;
301 struct ether_header *eh;
302 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
303 uint8_t dir, type, subtype, qos;
304 uint8_t *bssid;
305
306 if (m->m_flags & M_AMPDU_MPDU) {
307 /*
308 * Fastpath for A-MPDU reorder q resubmission. Frames
309 * w/ M_AMPDU_MPDU marked have already passed through
310 * here but were received out of order and been held on
311 * the reorder queue. When resubmitted they are marked
312 * with the M_AMPDU_MPDU flag and we can bypass most of
313 * the normal processing.
314 */
315 wh = mtod(m, struct ieee80211_frame *);
316 type = IEEE80211_FC0_TYPE_DATA;
317 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
318 subtype = IEEE80211_FC0_SUBTYPE_QOS;
319 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
320 goto resubmit_ampdu;
321 }
322
323 KASSERT(ni != NULL, ("null node"));
324 ni->ni_inact = ni->ni_inact_reload;
325
326 type = -1; /* undefined */
327
328 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
329 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
330 ni->ni_macaddr, NULL,
331 "too short (1): len %u", m->m_pkthdr.len);
332 vap->iv_stats.is_rx_tooshort++;
333 goto out;
334 }
335 /*
336 * Bit of a cheat here, we use a pointer for a 3-address
337 * frame format but don't reference fields past outside
338 * ieee80211_frame_min w/o first validating the data is
339 * present.
340 */
341 wh = mtod(m, struct ieee80211_frame *);
342
343 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
344 IEEE80211_FC0_VERSION_0) {
345 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
346 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
347 wh->i_fc[0], wh->i_fc[1]);
348 vap->iv_stats.is_rx_badversion++;
349 goto err;
350 }
351
352 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
353 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
354 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
355 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
356 if (dir != IEEE80211_FC1_DIR_NODS)
357 bssid = wh->i_addr1;
358 else if (type == IEEE80211_FC0_TYPE_CTL)
359 bssid = wh->i_addr1;
360 else {
361 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
362 IEEE80211_DISCARD_MAC(vap,
363 IEEE80211_MSG_ANY, ni->ni_macaddr,
364 NULL, "too short (2): len %u",
365 m->m_pkthdr.len);
366 vap->iv_stats.is_rx_tooshort++;
367 goto out;
368 }
369 bssid = wh->i_addr3;
370 }
371 /*
372 * Validate the bssid.
373 */
374 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
375 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
376 /* not interested in */
377 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
378 bssid, NULL, "%s", "not to bss");
379 vap->iv_stats.is_rx_wrongbss++;
380 goto out;
381 }
382 /*
383 * Data frame, cons up a node when it doesn't
384 * exist. This should probably done after an ACL check.
385 */
386 if (type == IEEE80211_FC0_TYPE_DATA &&
387 ni == vap->iv_bss &&
388 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
389 /*
390 * Beware of frames that come in too early; we
391 * can receive broadcast frames and creating sta
392 * entries will blow up because there is no bss
393 * channel yet.
394 */
395 if (vap->iv_state != IEEE80211_S_RUN) {
396 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
397 wh, "data", "not in RUN state (%s)",
398 ieee80211_state_name[vap->iv_state]);
399 vap->iv_stats.is_rx_badstate++;
400 goto err;
401 }
402 /*
403 * Fake up a node for this newly
404 * discovered member of the IBSS.
405 */
406 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2);
407 if (ni == NULL) {
408 /* NB: stat kept for alloc failure */
409 goto err;
410 }
411 }
412 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
413 ni->ni_noise = nf;
414 if (IEEE80211_HAS_SEQ(type, subtype) &&
415 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
416 uint8_t tid = ieee80211_gettid(wh);
417 if (IEEE80211_QOS_HAS_SEQ(wh) &&
418 TID_TO_WME_AC(tid) >= WME_AC_VI)
419 ic->ic_wme.wme_hipri_traffic++;
420 if (! ieee80211_check_rxseq(ni, wh, bssid))
421 goto out;
422 }
423 }
424
425 switch (type) {
426 case IEEE80211_FC0_TYPE_DATA:
427 hdrspace = ieee80211_hdrspace(ic, wh);
428 if (m->m_len < hdrspace &&
429 (m = m_pullup(m, hdrspace)) == NULL) {
430 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
431 ni->ni_macaddr, NULL,
432 "data too short: expecting %u", hdrspace);
433 vap->iv_stats.is_rx_tooshort++;
434 goto out; /* XXX */
435 }
436 if (dir != IEEE80211_FC1_DIR_NODS) {
437 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
438 wh, "data", "incorrect dir 0x%x", dir);
439 vap->iv_stats.is_rx_wrongdir++;
440 goto out;
441 }
442 /* XXX no power-save support */
443
444 /*
445 * Handle A-MPDU re-ordering. If the frame is to be
446 * processed directly then ieee80211_ampdu_reorder
447 * will return 0; otherwise it has consumed the mbuf
448 * and we should do nothing more with it.
449 */
450 if ((m->m_flags & M_AMPDU) &&
451 ieee80211_ampdu_reorder(ni, m) != 0) {
452 m = NULL;
453 goto out;
454 }
455 resubmit_ampdu:
456
457 /*
458 * Handle privacy requirements. Note that we
459 * must not be preempted from here until after
460 * we (potentially) call ieee80211_crypto_demic;
461 * otherwise we may violate assumptions in the
462 * crypto cipher modules used to do delayed update
463 * of replay sequence numbers.
464 */
465 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
466 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
467 /*
468 * Discard encrypted frames when privacy is off.
469 */
470 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
471 wh, "WEP", "%s", "PRIVACY off");
472 vap->iv_stats.is_rx_noprivacy++;
473 IEEE80211_NODE_STAT(ni, rx_noprivacy);
474 goto out;
475 }
476 key = ieee80211_crypto_decap(ni, m, hdrspace);
477 if (key == NULL) {
478 /* NB: stats+msgs handled in crypto_decap */
479 IEEE80211_NODE_STAT(ni, rx_wepfail);
480 goto out;
481 }
482 wh = mtod(m, struct ieee80211_frame *);
483 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
484 } else {
485 /* XXX M_WEP and IEEE80211_F_PRIVACY */
486 key = NULL;
487 }
488
489 /*
490 * Save QoS bits for use below--before we strip the header.
491 */
492 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
493 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
494 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
495 ((struct ieee80211_qosframe *)wh)->i_qos[0];
496 } else
497 qos = 0;
498
499 /*
500 * Next up, any fragmentation.
501 */
502 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
503 m = ieee80211_defrag(ni, m, hdrspace);
504 if (m == NULL) {
505 /* Fragment dropped or frame not complete yet */
506 goto out;
507 }
508 }
509 wh = NULL; /* no longer valid, catch any uses */
510
511 /*
512 * Next strip any MSDU crypto bits.
513 */
514 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
515 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
516 ni->ni_macaddr, "data", "%s", "demic error");
517 vap->iv_stats.is_rx_demicfail++;
518 IEEE80211_NODE_STAT(ni, rx_demicfail);
519 goto out;
520 }
521
522 /* copy to listener after decrypt */
523 if (ieee80211_radiotap_active_vap(vap))
524 ieee80211_radiotap_rx(vap, m);
525 need_tap = 0;
526
527 /*
528 * Finally, strip the 802.11 header.
529 */
530 m = ieee80211_decap(vap, m, hdrspace);
531 if (m == NULL) {
532 /* XXX mask bit to check for both */
533 /* don't count Null data frames as errors */
534 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
535 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
536 goto out;
537 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
538 ni->ni_macaddr, "data", "%s", "decap error");
539 vap->iv_stats.is_rx_decap++;
540 IEEE80211_NODE_STAT(ni, rx_decap);
541 goto err;
542 }
543 eh = mtod(m, struct ether_header *);
544 if (!ieee80211_node_is_authorized(ni)) {
545 /*
546 * Deny any non-PAE frames received prior to
547 * authorization. For open/shared-key
548 * authentication the port is mark authorized
549 * after authentication completes. For 802.1x
550 * the port is not marked authorized by the
551 * authenticator until the handshake has completed.
552 */
553 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
554 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
555 eh->ether_shost, "data",
556 "unauthorized port: ether type 0x%x len %u",
557 eh->ether_type, m->m_pkthdr.len);
558 vap->iv_stats.is_rx_unauth++;
559 IEEE80211_NODE_STAT(ni, rx_unauth);
560 goto err;
561 }
562 } else {
563 /*
564 * When denying unencrypted frames, discard
565 * any non-PAE frames received without encryption.
566 */
567 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
568 (key == NULL && (m->m_flags & M_WEP) == 0) &&
569 eh->ether_type != htons(ETHERTYPE_PAE)) {
570 /*
571 * Drop unencrypted frames.
572 */
573 vap->iv_stats.is_rx_unencrypted++;
574 IEEE80211_NODE_STAT(ni, rx_unencrypted);
575 goto out;
576 }
577 }
578 /* XXX require HT? */
579 if (qos & IEEE80211_QOS_AMSDU) {
580 m = ieee80211_decap_amsdu(ni, m);
581 if (m == NULL)
582 return IEEE80211_FC0_TYPE_DATA;
583 } else {
584 #ifdef IEEE80211_SUPPORT_SUPERG
585 m = ieee80211_decap_fastframe(vap, ni, m);
586 if (m == NULL)
587 return IEEE80211_FC0_TYPE_DATA;
588 #endif
589 }
590 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
591 ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
592 else
593 ieee80211_deliver_data(vap, ni, m);
594 return IEEE80211_FC0_TYPE_DATA;
595
596 case IEEE80211_FC0_TYPE_MGT:
597 vap->iv_stats.is_rx_mgmt++;
598 IEEE80211_NODE_STAT(ni, rx_mgmt);
599 if (dir != IEEE80211_FC1_DIR_NODS) {
600 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
601 wh, "data", "incorrect dir 0x%x", dir);
602 vap->iv_stats.is_rx_wrongdir++;
603 goto err;
604 }
605 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
606 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
607 ni->ni_macaddr, "mgt", "too short: len %u",
608 m->m_pkthdr.len);
609 vap->iv_stats.is_rx_tooshort++;
610 goto out;
611 }
612 #ifdef IEEE80211_DEBUG
613 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
614 ieee80211_msg_dumppkts(vap)) {
615 if_printf(ifp, "received %s from %s rssi %d\n",
616 ieee80211_mgt_subtype_name(subtype),
617 ether_sprintf(wh->i_addr2), rssi);
618 }
619 #endif
620 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
621 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
622 wh, NULL, "%s", "WEP set but not permitted");
623 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
624 goto out;
625 }
626 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
627 goto out;
628
629 case IEEE80211_FC0_TYPE_CTL:
630 vap->iv_stats.is_rx_ctl++;
631 IEEE80211_NODE_STAT(ni, rx_ctrl);
632 vap->iv_recv_ctl(ni, m, subtype);
633 goto out;
634
635 default:
636 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
637 wh, "bad", "frame type 0x%x", type);
638 /* should not come here */
639 break;
640 }
641 err:
642 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
643 out:
644 if (m != NULL) {
645 if (need_tap && ieee80211_radiotap_active_vap(vap))
646 ieee80211_radiotap_rx(vap, m);
647 m_freem(m);
648 }
649 return type;
650 }
651
652 static int
is11bclient(const uint8_t * rates,const uint8_t * xrates)653 is11bclient(const uint8_t *rates, const uint8_t *xrates)
654 {
655 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
656 int i;
657
658 /* NB: the 11b clients we care about will not have xrates */
659 if (xrates != NULL || rates == NULL)
660 return 0;
661 for (i = 0; i < rates[1]; i++) {
662 int r = rates[2+i] & IEEE80211_RATE_VAL;
663 if (r > 2*11 || ((1<<r) & brates) == 0)
664 return 0;
665 }
666 return 1;
667 }
668
669 static void
adhoc_recv_mgmt(struct ieee80211_node * ni,struct mbuf * m0,int subtype,const struct ieee80211_rx_stats * rxs,int rssi,int nf)670 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
671 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
672 {
673 struct ieee80211vap *vap = ni->ni_vap;
674 struct ieee80211com *ic = ni->ni_ic;
675 struct ieee80211_channel *rxchan = ic->ic_curchan;
676 struct ieee80211_frame *wh;
677 uint8_t *frm, *efrm, *sfrm;
678 uint8_t *ssid, *rates, *xrates;
679 #if 0
680 int ht_state_change = 0;
681 #endif
682
683 wh = mtod(m0, struct ieee80211_frame *);
684 frm = (uint8_t *)&wh[1];
685 efrm = mtod(m0, uint8_t *) + m0->m_len;
686 switch (subtype) {
687 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
688 case IEEE80211_FC0_SUBTYPE_BEACON: {
689 struct ieee80211_scanparams scan;
690 struct ieee80211_channel *c;
691 /*
692 * We process beacon/probe response
693 * frames to discover neighbors.
694 */
695 if (rxs != NULL) {
696 c = ieee80211_lookup_channel_rxstatus(vap, rxs);
697 if (c != NULL)
698 rxchan = c;
699 }
700 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0)
701 return;
702 /*
703 * Count frame now that we know it's to be processed.
704 */
705 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
706 vap->iv_stats.is_rx_beacon++; /* XXX remove */
707 IEEE80211_NODE_STAT(ni, rx_beacons);
708 } else
709 IEEE80211_NODE_STAT(ni, rx_proberesp);
710 /*
711 * If scanning, just pass information to the scan module.
712 */
713 if (ic->ic_flags & IEEE80211_F_SCAN) {
714 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
715 /*
716 * Actively scanning a channel marked passive;
717 * send a probe request now that we know there
718 * is 802.11 traffic present.
719 *
720 * XXX check if the beacon we recv'd gives
721 * us what we need and suppress the probe req
722 */
723 ieee80211_probe_curchan(vap, 1);
724 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
725 }
726 ieee80211_add_scan(vap, rxchan, &scan, wh,
727 subtype, rssi, nf);
728 return;
729 }
730 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
731 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
732 /*
733 * Create a new entry in the neighbor table.
734 */
735 ni = ieee80211_add_neighbor(vap, wh, &scan);
736 } else if (ni->ni_capinfo == 0) {
737 /*
738 * Update faked node created on transmit.
739 * Note this also updates the tsf.
740 */
741 ieee80211_init_neighbor(ni, wh, &scan);
742 } else {
743 /*
744 * Record tsf for potential resync.
745 */
746 memcpy(ni->ni_tstamp.data, scan.tstamp,
747 sizeof(ni->ni_tstamp));
748 }
749 /*
750 * This isn't enabled yet - otherwise it would
751 * update the HT parameters and channel width
752 * from any node, which could lead to lots of
753 * strange behaviour if the 11n nodes aren't
754 * exactly configured to match.
755 */
756 #if 0
757 if (scan.htcap != NULL && scan.htinfo != NULL &&
758 (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
759 if (ieee80211_ht_updateparams(ni,
760 scan.htcap, scan.htinfo))
761 ht_state_change = 1;
762 }
763 #endif
764 if (ni != NULL) {
765 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
766 ni->ni_noise = nf;
767 }
768 /*
769 * Same here - the channel width change should
770 * be applied to the specific peer node, not
771 * to the ic. Ie, the interface configuration
772 * should stay in its current channel width;
773 * but it should change the rate control and
774 * any queued frames for the given node only.
775 *
776 * Since there's no (current) way to inform
777 * the driver that a channel width change has
778 * occurred for a single node, just stub this
779 * out.
780 */
781 #if 0
782 if (ht_state_change)
783 ieee80211_update_chw(ic);
784 #endif
785 }
786 break;
787 }
788
789 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
790 if (vap->iv_state != IEEE80211_S_RUN) {
791 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
792 wh, NULL, "wrong state %s",
793 ieee80211_state_name[vap->iv_state]);
794 vap->iv_stats.is_rx_mgtdiscard++;
795 return;
796 }
797 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
798 /* frame must be directed */
799 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
800 wh, NULL, "%s", "not unicast");
801 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */
802 return;
803 }
804
805 /*
806 * prreq frame format
807 * [tlv] ssid
808 * [tlv] supported rates
809 * [tlv] extended supported rates
810 */
811 ssid = rates = xrates = NULL;
812 sfrm = frm;
813 while (efrm - frm > 1) {
814 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
815 switch (*frm) {
816 case IEEE80211_ELEMID_SSID:
817 ssid = frm;
818 break;
819 case IEEE80211_ELEMID_RATES:
820 rates = frm;
821 break;
822 case IEEE80211_ELEMID_XRATES:
823 xrates = frm;
824 break;
825 }
826 frm += frm[1] + 2;
827 }
828 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
829 if (xrates != NULL)
830 IEEE80211_VERIFY_ELEMENT(xrates,
831 IEEE80211_RATE_MAXSIZE - rates[1], return);
832 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
833 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
834 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
835 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
836 wh, NULL,
837 "%s", "no ssid with ssid suppression enabled");
838 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
839 return;
840 }
841
842 /* XXX find a better class or define it's own */
843 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
844 "%s", "recv probe req");
845 /*
846 * Some legacy 11b clients cannot hack a complete
847 * probe response frame. When the request includes
848 * only a bare-bones rate set, communicate this to
849 * the transmit side.
850 */
851 ieee80211_send_proberesp(vap, wh->i_addr2,
852 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
853 break;
854
855 case IEEE80211_FC0_SUBTYPE_ACTION:
856 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
857 if ((ni == vap->iv_bss) &&
858 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
859 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
860 wh, NULL, "%s", "unknown node");
861 vap->iv_stats.is_rx_mgtdiscard++;
862 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
863 !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
864 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
865 wh, NULL, "%s", "not for us");
866 vap->iv_stats.is_rx_mgtdiscard++;
867 } else if (vap->iv_state != IEEE80211_S_RUN) {
868 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
869 wh, NULL, "wrong state %s",
870 ieee80211_state_name[vap->iv_state]);
871 vap->iv_stats.is_rx_mgtdiscard++;
872 } else {
873 if (ieee80211_parse_action(ni, m0) == 0)
874 (void)ic->ic_recv_action(ni, wh, frm, efrm);
875 }
876 break;
877
878 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
879 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
880 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
881 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
882 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
883 case IEEE80211_FC0_SUBTYPE_ATIM:
884 case IEEE80211_FC0_SUBTYPE_DISASSOC:
885 case IEEE80211_FC0_SUBTYPE_AUTH:
886 case IEEE80211_FC0_SUBTYPE_DEAUTH:
887 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
888 wh, NULL, "%s", "not handled");
889 vap->iv_stats.is_rx_mgtdiscard++;
890 break;
891
892 default:
893 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
894 wh, "mgt", "subtype 0x%x not handled", subtype);
895 vap->iv_stats.is_rx_badsubtype++;
896 break;
897 }
898 }
899 #undef IEEE80211_VERIFY_LENGTH
900 #undef IEEE80211_VERIFY_ELEMENT
901
902 static void
ahdemo_recv_mgmt(struct ieee80211_node * ni,struct mbuf * m0,int subtype,const struct ieee80211_rx_stats * rxs,int rssi,int nf)903 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
904 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
905 {
906 struct ieee80211vap *vap = ni->ni_vap;
907 struct ieee80211com *ic = ni->ni_ic;
908 struct ieee80211_frame *wh;
909
910 /*
911 * Process management frames when scanning; useful for doing
912 * a site-survey.
913 */
914 if (ic->ic_flags & IEEE80211_F_SCAN)
915 adhoc_recv_mgmt(ni, m0, subtype, rxs, rssi, nf);
916 else {
917 wh = mtod(m0, struct ieee80211_frame *);
918 switch (subtype) {
919 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
920 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
921 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
922 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
923 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
924 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
925 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
926 case IEEE80211_FC0_SUBTYPE_BEACON:
927 case IEEE80211_FC0_SUBTYPE_ATIM:
928 case IEEE80211_FC0_SUBTYPE_DISASSOC:
929 case IEEE80211_FC0_SUBTYPE_AUTH:
930 case IEEE80211_FC0_SUBTYPE_DEAUTH:
931 case IEEE80211_FC0_SUBTYPE_ACTION:
932 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
933 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
934 wh, NULL, "%s", "not handled");
935 vap->iv_stats.is_rx_mgtdiscard++;
936 break;
937 default:
938 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
939 wh, "mgt", "subtype 0x%x not handled", subtype);
940 vap->iv_stats.is_rx_badsubtype++;
941 break;
942 }
943 }
944 }
945
946 static void
adhoc_recv_ctl(struct ieee80211_node * ni,struct mbuf * m,int subtype)947 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
948 {
949
950 switch (subtype) {
951 case IEEE80211_FC0_SUBTYPE_BAR:
952 ieee80211_recv_bar(ni, m);
953 break;
954 }
955 }
956