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: releng/11.1/sys/net80211/ieee80211_adhoc.c 302202 2016-06-25 20:31:20Z adrian $");
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 <net80211/ieee80211_var.h>
59 #include <net80211/ieee80211_adhoc.h>
60 #include <net80211/ieee80211_input.h>
61 #ifdef IEEE80211_SUPPORT_SUPERG
62 #include <net80211/ieee80211_superg.h>
63 #endif
64 #ifdef IEEE80211_SUPPORT_TDMA
65 #include <net80211/ieee80211_tdma.h>
66 #endif
67 #include <net80211/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
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
89 ieee80211_adhoc_detach(struct ieee80211com *ic)
90 {
91 }
92
93 static void
94 adhoc_vdetach(struct ieee80211vap *vap)
95 {
96 }
97
98 static void
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
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
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 printf(" 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
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
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 (!(type == IEEE80211_FC0_TYPE_MGT &&
375 (subtype == IEEE80211_FC0_SUBTYPE_BEACON ||
376 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)) &&
377 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
378 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
379 /* not interested in */
380 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
381 bssid, NULL, "%s", "not to bss");
382 vap->iv_stats.is_rx_wrongbss++;
383 goto out;
384 }
385 /*
386 * Data frame, cons up a node when it doesn't
387 * exist. This should probably done after an ACL check.
388 */
389 if (type == IEEE80211_FC0_TYPE_DATA &&
390 ni == vap->iv_bss &&
391 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
392 /*
393 * Beware of frames that come in too early; we
394 * can receive broadcast frames and creating sta
395 * entries will blow up because there is no bss
396 * channel yet.
397 */
398 if (vap->iv_state != IEEE80211_S_RUN) {
399 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
400 wh, "data", "not in RUN state (%s)",
401 ieee80211_state_name[vap->iv_state]);
402 vap->iv_stats.is_rx_badstate++;
403 goto err;
404 }
405 /*
406 * Fake up a node for this newly
407 * discovered member of the IBSS.
408 */
409 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2);
410 if (ni == NULL) {
411 /* NB: stat kept for alloc failure */
412 goto err;
413 }
414 }
415 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
416 ni->ni_noise = nf;
417 if (IEEE80211_HAS_SEQ(type, subtype) &&
418 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
419 uint8_t tid = ieee80211_gettid(wh);
420 if (IEEE80211_QOS_HAS_SEQ(wh) &&
421 TID_TO_WME_AC(tid) >= WME_AC_VI)
422 ic->ic_wme.wme_hipri_traffic++;
423 if (! ieee80211_check_rxseq(ni, wh, bssid))
424 goto out;
425 }
426 }
427
428 switch (type) {
429 case IEEE80211_FC0_TYPE_DATA:
430 hdrspace = ieee80211_hdrspace(ic, wh);
431 if (m->m_len < hdrspace &&
432 (m = m_pullup(m, hdrspace)) == NULL) {
433 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
434 ni->ni_macaddr, NULL,
435 "data too short: expecting %u", hdrspace);
436 vap->iv_stats.is_rx_tooshort++;
437 goto out; /* XXX */
438 }
439 if (dir != IEEE80211_FC1_DIR_NODS) {
440 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
441 wh, "data", "incorrect dir 0x%x", dir);
442 vap->iv_stats.is_rx_wrongdir++;
443 goto out;
444 }
445 /* XXX no power-save support */
446
447 /*
448 * Handle A-MPDU re-ordering. If the frame is to be
449 * processed directly then ieee80211_ampdu_reorder
450 * will return 0; otherwise it has consumed the mbuf
451 * and we should do nothing more with it.
452 */
453 if ((m->m_flags & M_AMPDU) &&
454 ieee80211_ampdu_reorder(ni, m) != 0) {
455 m = NULL;
456 goto out;
457 }
458 resubmit_ampdu:
459
460 /*
461 * Handle privacy requirements. Note that we
462 * must not be preempted from here until after
463 * we (potentially) call ieee80211_crypto_demic;
464 * otherwise we may violate assumptions in the
465 * crypto cipher modules used to do delayed update
466 * of replay sequence numbers.
467 */
468 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
469 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
470 /*
471 * Discard encrypted frames when privacy is off.
472 */
473 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
474 wh, "WEP", "%s", "PRIVACY off");
475 vap->iv_stats.is_rx_noprivacy++;
476 IEEE80211_NODE_STAT(ni, rx_noprivacy);
477 goto out;
478 }
479 key = ieee80211_crypto_decap(ni, m, hdrspace);
480 if (key == NULL) {
481 /* NB: stats+msgs handled in crypto_decap */
482 IEEE80211_NODE_STAT(ni, rx_wepfail);
483 goto out;
484 }
485 wh = mtod(m, struct ieee80211_frame *);
486 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
487 } else {
488 /* XXX M_WEP and IEEE80211_F_PRIVACY */
489 key = NULL;
490 }
491
492 /*
493 * Save QoS bits for use below--before we strip the header.
494 */
495 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
496 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
497 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
498 ((struct ieee80211_qosframe *)wh)->i_qos[0];
499 } else
500 qos = 0;
501
502 /*
503 * Next up, any fragmentation.
504 */
505 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
506 m = ieee80211_defrag(ni, m, hdrspace);
507 if (m == NULL) {
508 /* Fragment dropped or frame not complete yet */
509 goto out;
510 }
511 }
512 wh = NULL; /* no longer valid, catch any uses */
513
514 /*
515 * Next strip any MSDU crypto bits.
516 */
517 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
518 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
519 ni->ni_macaddr, "data", "%s", "demic error");
520 vap->iv_stats.is_rx_demicfail++;
521 IEEE80211_NODE_STAT(ni, rx_demicfail);
522 goto out;
523 }
524
525 /* copy to listener after decrypt */
526 if (ieee80211_radiotap_active_vap(vap))
527 ieee80211_radiotap_rx(vap, m);
528 need_tap = 0;
529
530 /*
531 * Finally, strip the 802.11 header.
532 */
533 m = ieee80211_decap(vap, m, hdrspace);
534 if (m == NULL) {
535 /* XXX mask bit to check for both */
536 /* don't count Null data frames as errors */
537 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
538 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
539 goto out;
540 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
541 ni->ni_macaddr, "data", "%s", "decap error");
542 vap->iv_stats.is_rx_decap++;
543 IEEE80211_NODE_STAT(ni, rx_decap);
544 goto err;
545 }
546 eh = mtod(m, struct ether_header *);
547 if (!ieee80211_node_is_authorized(ni)) {
548 /*
549 * Deny any non-PAE frames received prior to
550 * authorization. For open/shared-key
551 * authentication the port is mark authorized
552 * after authentication completes. For 802.1x
553 * the port is not marked authorized by the
554 * authenticator until the handshake has completed.
555 */
556 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
557 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
558 eh->ether_shost, "data",
559 "unauthorized port: ether type 0x%x len %u",
560 eh->ether_type, m->m_pkthdr.len);
561 vap->iv_stats.is_rx_unauth++;
562 IEEE80211_NODE_STAT(ni, rx_unauth);
563 goto err;
564 }
565 } else {
566 /*
567 * When denying unencrypted frames, discard
568 * any non-PAE frames received without encryption.
569 */
570 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
571 (key == NULL && (m->m_flags & M_WEP) == 0) &&
572 eh->ether_type != htons(ETHERTYPE_PAE)) {
573 /*
574 * Drop unencrypted frames.
575 */
576 vap->iv_stats.is_rx_unencrypted++;
577 IEEE80211_NODE_STAT(ni, rx_unencrypted);
578 goto out;
579 }
580 }
581 /* XXX require HT? */
582 if (qos & IEEE80211_QOS_AMSDU) {
583 m = ieee80211_decap_amsdu(ni, m);
584 if (m == NULL)
585 return IEEE80211_FC0_TYPE_DATA;
586 } else {
587 #ifdef IEEE80211_SUPPORT_SUPERG
588 m = ieee80211_decap_fastframe(vap, ni, m);
589 if (m == NULL)
590 return IEEE80211_FC0_TYPE_DATA;
591 #endif
592 }
593 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
594 ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
595 else
596 ieee80211_deliver_data(vap, ni, m);
597 return IEEE80211_FC0_TYPE_DATA;
598
599 case IEEE80211_FC0_TYPE_MGT:
600 vap->iv_stats.is_rx_mgmt++;
601 IEEE80211_NODE_STAT(ni, rx_mgmt);
602 if (dir != IEEE80211_FC1_DIR_NODS) {
603 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
604 wh, "data", "incorrect dir 0x%x", dir);
605 vap->iv_stats.is_rx_wrongdir++;
606 goto err;
607 }
608 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
609 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
610 ni->ni_macaddr, "mgt", "too short: len %u",
611 m->m_pkthdr.len);
612 vap->iv_stats.is_rx_tooshort++;
613 goto out;
614 }
615 #ifdef IEEE80211_DEBUG
616 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
617 ieee80211_msg_dumppkts(vap)) {
618 if_printf(ifp, "received %s from %s rssi %d\n",
619 ieee80211_mgt_subtype_name(subtype),
620 ether_sprintf(wh->i_addr2), rssi);
621 }
622 #endif
623 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
624 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
625 wh, NULL, "%s", "WEP set but not permitted");
626 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
627 goto out;
628 }
629 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
630 goto out;
631
632 case IEEE80211_FC0_TYPE_CTL:
633 vap->iv_stats.is_rx_ctl++;
634 IEEE80211_NODE_STAT(ni, rx_ctrl);
635 vap->iv_recv_ctl(ni, m, subtype);
636 goto out;
637
638 default:
639 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
640 wh, "bad", "frame type 0x%x", type);
641 /* should not come here */
642 break;
643 }
644 err:
645 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
646 out:
647 if (m != NULL) {
648 if (need_tap && ieee80211_radiotap_active_vap(vap))
649 ieee80211_radiotap_rx(vap, m);
650 m_freem(m);
651 }
652 return type;
653 }
654
655 static int
656 is11bclient(const uint8_t *rates, const uint8_t *xrates)
657 {
658 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
659 int i;
660
661 /* NB: the 11b clients we care about will not have xrates */
662 if (xrates != NULL || rates == NULL)
663 return 0;
664 for (i = 0; i < rates[1]; i++) {
665 int r = rates[2+i] & IEEE80211_RATE_VAL;
666 if (r > 2*11 || ((1<<r) & brates) == 0)
667 return 0;
668 }
669 return 1;
670 }
671
672 static void
673 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
674 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
675 {
676 struct ieee80211vap *vap = ni->ni_vap;
677 struct ieee80211com *ic = ni->ni_ic;
678 struct ieee80211_channel *rxchan = ic->ic_curchan;
679 struct ieee80211_frame *wh;
680 uint8_t *frm, *efrm;
681 uint8_t *ssid, *rates, *xrates;
682 #if 0
683 int ht_state_change = 0;
684 #endif
685
686 wh = mtod(m0, struct ieee80211_frame *);
687 frm = (uint8_t *)&wh[1];
688 efrm = mtod(m0, uint8_t *) + m0->m_len;
689 switch (subtype) {
690 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
691 case IEEE80211_FC0_SUBTYPE_BEACON: {
692 struct ieee80211_scanparams scan;
693 struct ieee80211_channel *c;
694 /*
695 * We process beacon/probe response
696 * frames to discover neighbors.
697 */
698 if (rxs != NULL) {
699 c = ieee80211_lookup_channel_rxstatus(vap, rxs);
700 if (c != NULL)
701 rxchan = c;
702 }
703 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0)
704 return;
705 /*
706 * Count frame now that we know it's to be processed.
707 */
708 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
709 vap->iv_stats.is_rx_beacon++; /* XXX remove */
710 IEEE80211_NODE_STAT(ni, rx_beacons);
711 } else
712 IEEE80211_NODE_STAT(ni, rx_proberesp);
713 /*
714 * If scanning, just pass information to the scan module.
715 */
716 if (ic->ic_flags & IEEE80211_F_SCAN) {
717 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
718 /*
719 * Actively scanning a channel marked passive;
720 * send a probe request now that we know there
721 * is 802.11 traffic present.
722 *
723 * XXX check if the beacon we recv'd gives
724 * us what we need and suppress the probe req
725 */
726 ieee80211_probe_curchan(vap, 1);
727 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
728 }
729 ieee80211_add_scan(vap, rxchan, &scan, wh,
730 subtype, rssi, nf);
731 return;
732 }
733 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
734 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
735 /*
736 * Create a new entry in the neighbor table.
737 */
738 ni = ieee80211_add_neighbor(vap, wh, &scan);
739 } else if (ni->ni_capinfo == 0) {
740 /*
741 * Update faked node created on transmit.
742 * Note this also updates the tsf.
743 */
744 ieee80211_init_neighbor(ni, wh, &scan);
745 } else {
746 /*
747 * Record tsf for potential resync.
748 */
749 memcpy(ni->ni_tstamp.data, scan.tstamp,
750 sizeof(ni->ni_tstamp));
751 }
752 /*
753 * This isn't enabled yet - otherwise it would
754 * update the HT parameters and channel width
755 * from any node, which could lead to lots of
756 * strange behaviour if the 11n nodes aren't
757 * exactly configured to match.
758 */
759 #if 0
760 if (scan.htcap != NULL && scan.htinfo != NULL &&
761 (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
762 if (ieee80211_ht_updateparams(ni,
763 scan.htcap, scan.htinfo))
764 ht_state_change = 1;
765 }
766 #endif
767 if (ni != NULL) {
768 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
769 ni->ni_noise = nf;
770 }
771 /*
772 * Same here - the channel width change should
773 * be applied to the specific peer node, not
774 * to the ic. Ie, the interface configuration
775 * should stay in its current channel width;
776 * but it should change the rate control and
777 * any queued frames for the given node only.
778 *
779 * Since there's no (current) way to inform
780 * the driver that a channel width change has
781 * occurred for a single node, just stub this
782 * out.
783 */
784 #if 0
785 if (ht_state_change)
786 ieee80211_update_chw(ic);
787 #endif
788 }
789 break;
790 }
791
792 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
793 if (vap->iv_state != IEEE80211_S_RUN) {
794 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
795 wh, NULL, "wrong state %s",
796 ieee80211_state_name[vap->iv_state]);
797 vap->iv_stats.is_rx_mgtdiscard++;
798 return;
799 }
800 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
801 /* frame must be directed */
802 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
803 wh, NULL, "%s", "not unicast");
804 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */
805 return;
806 }
807
808 /*
809 * prreq frame format
810 * [tlv] ssid
811 * [tlv] supported rates
812 * [tlv] extended supported rates
813 */
814 ssid = rates = xrates = NULL;
815 while (efrm - frm > 1) {
816 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
817 switch (*frm) {
818 case IEEE80211_ELEMID_SSID:
819 ssid = frm;
820 break;
821 case IEEE80211_ELEMID_RATES:
822 rates = frm;
823 break;
824 case IEEE80211_ELEMID_XRATES:
825 xrates = frm;
826 break;
827 }
828 frm += frm[1] + 2;
829 }
830 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
831 if (xrates != NULL)
832 IEEE80211_VERIFY_ELEMENT(xrates,
833 IEEE80211_RATE_MAXSIZE - rates[1], return);
834 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
835 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
836 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
837 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
838 wh, NULL,
839 "%s", "no ssid with ssid suppression enabled");
840 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
841 return;
842 }
843
844 /* XXX find a better class or define it's own */
845 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
846 "%s", "recv probe req");
847 /*
848 * Some legacy 11b clients cannot hack a complete
849 * probe response frame. When the request includes
850 * only a bare-bones rate set, communicate this to
851 * the transmit side.
852 */
853 ieee80211_send_proberesp(vap, wh->i_addr2,
854 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
855 break;
856
857 case IEEE80211_FC0_SUBTYPE_ACTION:
858 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
859 if ((ni == vap->iv_bss) &&
860 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
861 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
862 wh, NULL, "%s", "unknown node");
863 vap->iv_stats.is_rx_mgtdiscard++;
864 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
865 !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
866 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
867 wh, NULL, "%s", "not for us");
868 vap->iv_stats.is_rx_mgtdiscard++;
869 } else if (vap->iv_state != IEEE80211_S_RUN) {
870 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
871 wh, NULL, "wrong state %s",
872 ieee80211_state_name[vap->iv_state]);
873 vap->iv_stats.is_rx_mgtdiscard++;
874 } else {
875 if (ieee80211_parse_action(ni, m0) == 0)
876 (void)ic->ic_recv_action(ni, wh, frm, efrm);
877 }
878 break;
879
880 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
881 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
882 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
883 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
884 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
885 case IEEE80211_FC0_SUBTYPE_ATIM:
886 case IEEE80211_FC0_SUBTYPE_DISASSOC:
887 case IEEE80211_FC0_SUBTYPE_AUTH:
888 case IEEE80211_FC0_SUBTYPE_DEAUTH:
889 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
890 wh, NULL, "%s", "not handled");
891 vap->iv_stats.is_rx_mgtdiscard++;
892 break;
893
894 default:
895 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
896 wh, "mgt", "subtype 0x%x not handled", subtype);
897 vap->iv_stats.is_rx_badsubtype++;
898 break;
899 }
900 }
901 #undef IEEE80211_VERIFY_LENGTH
902 #undef IEEE80211_VERIFY_ELEMENT
903
904 static void
905 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
906 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
907 {
908 struct ieee80211vap *vap = ni->ni_vap;
909 struct ieee80211com *ic = ni->ni_ic;
910 struct ieee80211_frame *wh;
911
912 /*
913 * Process management frames when scanning; useful for doing
914 * a site-survey.
915 */
916 if (ic->ic_flags & IEEE80211_F_SCAN)
917 adhoc_recv_mgmt(ni, m0, subtype, rxs, rssi, nf);
918 else {
919 wh = mtod(m0, struct ieee80211_frame *);
920 switch (subtype) {
921 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
922 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
923 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
924 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
925 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
926 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
927 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
928 case IEEE80211_FC0_SUBTYPE_BEACON:
929 case IEEE80211_FC0_SUBTYPE_ATIM:
930 case IEEE80211_FC0_SUBTYPE_DISASSOC:
931 case IEEE80211_FC0_SUBTYPE_AUTH:
932 case IEEE80211_FC0_SUBTYPE_DEAUTH:
933 case IEEE80211_FC0_SUBTYPE_ACTION:
934 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
935 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
936 wh, NULL, "%s", "not handled");
937 vap->iv_stats.is_rx_mgtdiscard++;
938 break;
939 default:
940 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
941 wh, "mgt", "subtype 0x%x not handled", subtype);
942 vap->iv_stats.is_rx_badsubtype++;
943 break;
944 }
945 }
946 }
947
948 static void
949 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
950 {
951
952 switch (subtype) {
953 case IEEE80211_FC0_SUBTYPE_BAR:
954 ieee80211_recv_bar(ni, m);
955 break;
956 }
957 }
Cache object: e8b16f23bf33c0b6d02adede353e0dac
|