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_media.h>
52 #include <net/if_llc.h>
53 #include <net/ethernet.h>
54
55 #include <net/bpf.h>
56
57 #include <net80211/ieee80211_var.h>
58 #include <net80211/ieee80211_adhoc.h>
59 #include <net80211/ieee80211_input.h>
60 #ifdef IEEE80211_SUPPORT_SUPERG
61 #include <net80211/ieee80211_superg.h>
62 #endif
63 #ifdef IEEE80211_SUPPORT_TDMA
64 #include <net80211/ieee80211_tdma.h>
65 #endif
66
67 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2)
68
69 static void adhoc_vattach(struct ieee80211vap *);
70 static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int);
71 static int adhoc_input(struct ieee80211_node *, struct mbuf *, int, int);
72 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *,
73 int subtype, int, int);
74 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *,
75 int subtype, int, int);
76 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
77
78 void
79 ieee80211_adhoc_attach(struct ieee80211com *ic)
80 {
81 ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach;
82 ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach;
83 }
84
85 void
86 ieee80211_adhoc_detach(struct ieee80211com *ic)
87 {
88 }
89
90 static void
91 adhoc_vdetach(struct ieee80211vap *vap)
92 {
93 }
94
95 static void
96 adhoc_vattach(struct ieee80211vap *vap)
97 {
98 vap->iv_newstate = adhoc_newstate;
99 vap->iv_input = adhoc_input;
100 if (vap->iv_opmode == IEEE80211_M_IBSS)
101 vap->iv_recv_mgmt = adhoc_recv_mgmt;
102 else
103 vap->iv_recv_mgmt = ahdemo_recv_mgmt;
104 vap->iv_recv_ctl = adhoc_recv_ctl;
105 vap->iv_opdetach = adhoc_vdetach;
106 #ifdef IEEE80211_SUPPORT_TDMA
107 /*
108 * Throw control to tdma support. Note we do this
109 * after setting up our callbacks so it can piggyback
110 * on top of us.
111 */
112 if (vap->iv_caps & IEEE80211_C_TDMA)
113 ieee80211_tdma_vattach(vap);
114 #endif
115 }
116
117 static void
118 sta_leave(void *arg, struct ieee80211_node *ni)
119 {
120 struct ieee80211vap *vap = arg;
121
122 if (ni->ni_vap == vap && ni != vap->iv_bss)
123 ieee80211_node_leave(ni);
124 }
125
126 /*
127 * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler.
128 */
129 static int
130 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
131 {
132 struct ieee80211com *ic = vap->iv_ic;
133 struct ieee80211_node *ni;
134 enum ieee80211_state ostate;
135
136 IEEE80211_LOCK_ASSERT(vap->iv_ic);
137
138 ostate = vap->iv_state;
139 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
140 __func__, ieee80211_state_name[ostate],
141 ieee80211_state_name[nstate], arg);
142 vap->iv_state = nstate; /* state transition */
143 if (ostate != IEEE80211_S_SCAN)
144 ieee80211_cancel_scan(vap); /* background scan */
145 ni = vap->iv_bss; /* NB: no reference held */
146 switch (nstate) {
147 case IEEE80211_S_INIT:
148 switch (ostate) {
149 case IEEE80211_S_SCAN:
150 ieee80211_cancel_scan(vap);
151 break;
152 default:
153 break;
154 }
155 if (ostate != IEEE80211_S_INIT) {
156 /* NB: optimize INIT -> INIT case */
157 ieee80211_reset_bss(vap);
158 }
159 break;
160 case IEEE80211_S_SCAN:
161 switch (ostate) {
162 case IEEE80211_S_RUN: /* beacon miss */
163 /* purge station table; entries are stale */
164 ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap);
165 /* fall thru... */
166 case IEEE80211_S_INIT:
167 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
168 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
169 /*
170 * Already have a channel; bypass the
171 * scan and startup immediately.
172 */
173 ieee80211_create_ibss(vap, vap->iv_des_chan);
174 break;
175 }
176 /*
177 * Initiate a scan. We can come here as a result
178 * of an IEEE80211_IOC_SCAN_REQ too in which case
179 * the vap will be marked with IEEE80211_FEXT_SCANREQ
180 * and the scan request parameters will be present
181 * in iv_scanreq. Otherwise we do the default.
182 */
183 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
184 ieee80211_check_scan(vap,
185 vap->iv_scanreq_flags,
186 vap->iv_scanreq_duration,
187 vap->iv_scanreq_mindwell,
188 vap->iv_scanreq_maxdwell,
189 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
190 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
191 } else
192 ieee80211_check_scan_current(vap);
193 break;
194 case IEEE80211_S_SCAN:
195 /*
196 * This can happen because of a change in state
197 * that requires a reset. Trigger a new scan
198 * unless we're in manual roaming mode in which
199 * case an application must issue an explicit request.
200 */
201 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
202 ieee80211_check_scan_current(vap);
203 break;
204 default:
205 goto invalid;
206 }
207 break;
208 case IEEE80211_S_RUN:
209 if (vap->iv_flags & IEEE80211_F_WPA) {
210 /* XXX validate prerequisites */
211 }
212 switch (ostate) {
213 case IEEE80211_S_SCAN:
214 #ifdef IEEE80211_DEBUG
215 if (ieee80211_msg_debug(vap)) {
216 ieee80211_note(vap,
217 "synchronized with %s ssid ",
218 ether_sprintf(ni->ni_bssid));
219 ieee80211_print_essid(vap->iv_bss->ni_essid,
220 ni->ni_esslen);
221 /* XXX MCS/HT */
222 printf(" channel %d start %uMb\n",
223 ieee80211_chan2ieee(ic, ic->ic_curchan),
224 IEEE80211_RATE2MBS(ni->ni_txrate));
225 }
226 #endif
227 break;
228 default:
229 goto invalid;
230 }
231 /*
232 * When 802.1x is not in use mark the port authorized
233 * at this point so traffic can flow.
234 */
235 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
236 ieee80211_node_authorize(ni);
237 /*
238 * Fake association when joining an existing bss.
239 */
240 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) &&
241 ic->ic_newassoc != NULL)
242 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN);
243 break;
244 case IEEE80211_S_SLEEP:
245 ieee80211_sta_pwrsave(vap, 0);
246 break;
247 default:
248 invalid:
249 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
250 "%s: unexpected state transition %s -> %s\n", __func__,
251 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
252 break;
253 }
254 return 0;
255 }
256
257 /*
258 * Decide if a received management frame should be
259 * printed when debugging is enabled. This filters some
260 * of the less interesting frames that come frequently
261 * (e.g. beacons).
262 */
263 static __inline int
264 doprint(struct ieee80211vap *vap, int subtype)
265 {
266 switch (subtype) {
267 case IEEE80211_FC0_SUBTYPE_BEACON:
268 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
269 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
270 return 1;
271 }
272 return 1;
273 }
274
275 /*
276 * Process a received frame. The node associated with the sender
277 * should be supplied. If nothing was found in the node table then
278 * the caller is assumed to supply a reference to iv_bss instead.
279 * The RSSI and a timestamp are also supplied. The RSSI data is used
280 * during AP scanning to select a AP to associate with; it can have
281 * any units so long as values have consistent units and higher values
282 * mean ``better signal''. The receive timestamp is currently not used
283 * by the 802.11 layer.
284 */
285 static int
286 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
287 {
288 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
289 #define HAS_SEQ(type) ((type & 0x4) == 0)
290 struct ieee80211vap *vap = ni->ni_vap;
291 struct ieee80211com *ic = ni->ni_ic;
292 struct ifnet *ifp = vap->iv_ifp;
293 struct ieee80211_frame *wh;
294 struct ieee80211_key *key;
295 struct ether_header *eh;
296 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
297 uint8_t dir, type, subtype, qos;
298 uint8_t *bssid;
299 uint16_t rxseq;
300
301 if (m->m_flags & M_AMPDU_MPDU) {
302 /*
303 * Fastpath for A-MPDU reorder q resubmission. Frames
304 * w/ M_AMPDU_MPDU marked have already passed through
305 * here but were received out of order and been held on
306 * the reorder queue. When resubmitted they are marked
307 * with the M_AMPDU_MPDU flag and we can bypass most of
308 * the normal processing.
309 */
310 wh = mtod(m, struct ieee80211_frame *);
311 type = IEEE80211_FC0_TYPE_DATA;
312 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
313 subtype = IEEE80211_FC0_SUBTYPE_QOS;
314 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
315 goto resubmit_ampdu;
316 }
317
318 KASSERT(ni != NULL, ("null node"));
319 ni->ni_inact = ni->ni_inact_reload;
320
321 type = -1; /* undefined */
322
323 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
324 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
325 ni->ni_macaddr, NULL,
326 "too short (1): len %u", m->m_pkthdr.len);
327 vap->iv_stats.is_rx_tooshort++;
328 goto out;
329 }
330 /*
331 * Bit of a cheat here, we use a pointer for a 3-address
332 * frame format but don't reference fields past outside
333 * ieee80211_frame_min w/o first validating the data is
334 * present.
335 */
336 wh = mtod(m, struct ieee80211_frame *);
337
338 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
339 IEEE80211_FC0_VERSION_0) {
340 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
341 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
342 wh->i_fc[0], wh->i_fc[1]);
343 vap->iv_stats.is_rx_badversion++;
344 goto err;
345 }
346
347 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
348 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
349 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
350 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
351 if (dir != IEEE80211_FC1_DIR_NODS)
352 bssid = wh->i_addr1;
353 else if (type == IEEE80211_FC0_TYPE_CTL)
354 bssid = wh->i_addr1;
355 else {
356 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
357 IEEE80211_DISCARD_MAC(vap,
358 IEEE80211_MSG_ANY, ni->ni_macaddr,
359 NULL, "too short (2): len %u",
360 m->m_pkthdr.len);
361 vap->iv_stats.is_rx_tooshort++;
362 goto out;
363 }
364 bssid = wh->i_addr3;
365 }
366 /*
367 * Validate the bssid.
368 */
369 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
370 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
371 /* not interested in */
372 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
373 bssid, NULL, "%s", "not to bss");
374 vap->iv_stats.is_rx_wrongbss++;
375 goto out;
376 }
377 /*
378 * Data frame, cons up a node when it doesn't
379 * exist. This should probably done after an ACL check.
380 */
381 if (type == IEEE80211_FC0_TYPE_DATA &&
382 ni == vap->iv_bss &&
383 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
384 /*
385 * Beware of frames that come in too early; we
386 * can receive broadcast frames and creating sta
387 * entries will blow up because there is no bss
388 * channel yet.
389 */
390 if (vap->iv_state != IEEE80211_S_RUN) {
391 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
392 wh, "data", "not in RUN state (%s)",
393 ieee80211_state_name[vap->iv_state]);
394 vap->iv_stats.is_rx_badstate++;
395 goto err;
396 }
397 /*
398 * Fake up a node for this newly
399 * discovered member of the IBSS.
400 */
401 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2);
402 if (ni == NULL) {
403 /* NB: stat kept for alloc failure */
404 goto err;
405 }
406 }
407 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
408 ni->ni_noise = nf;
409 if (HAS_SEQ(type)) {
410 uint8_t tid = ieee80211_gettid(wh);
411 if (IEEE80211_QOS_HAS_SEQ(wh) &&
412 TID_TO_WME_AC(tid) >= WME_AC_VI)
413 ic->ic_wme.wme_hipri_traffic++;
414 rxseq = le16toh(*(uint16_t *)wh->i_seq);
415 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
416 (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
417 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
418 /* duplicate, discard */
419 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
420 bssid, "duplicate",
421 "seqno <%u,%u> fragno <%u,%u> tid %u",
422 rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
423 ni->ni_rxseqs[tid] >>
424 IEEE80211_SEQ_SEQ_SHIFT,
425 rxseq & IEEE80211_SEQ_FRAG_MASK,
426 ni->ni_rxseqs[tid] &
427 IEEE80211_SEQ_FRAG_MASK,
428 tid);
429 vap->iv_stats.is_rx_dup++;
430 IEEE80211_NODE_STAT(ni, rx_dup);
431 goto out;
432 }
433 ni->ni_rxseqs[tid] = rxseq;
434 }
435 }
436
437 switch (type) {
438 case IEEE80211_FC0_TYPE_DATA:
439 hdrspace = ieee80211_hdrspace(ic, wh);
440 if (m->m_len < hdrspace &&
441 (m = m_pullup(m, hdrspace)) == NULL) {
442 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
443 ni->ni_macaddr, NULL,
444 "data too short: expecting %u", hdrspace);
445 vap->iv_stats.is_rx_tooshort++;
446 goto out; /* XXX */
447 }
448 if (dir != IEEE80211_FC1_DIR_NODS) {
449 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
450 wh, "data", "incorrect dir 0x%x", dir);
451 vap->iv_stats.is_rx_wrongdir++;
452 goto out;
453 }
454 /* XXX no power-save support */
455
456 /*
457 * Handle A-MPDU re-ordering. If the frame is to be
458 * processed directly then ieee80211_ampdu_reorder
459 * will return 0; otherwise it has consumed the mbuf
460 * and we should do nothing more with it.
461 */
462 if ((m->m_flags & M_AMPDU) &&
463 ieee80211_ampdu_reorder(ni, m) != 0) {
464 m = NULL;
465 goto out;
466 }
467 resubmit_ampdu:
468
469 /*
470 * Handle privacy requirements. Note that we
471 * must not be preempted from here until after
472 * we (potentially) call ieee80211_crypto_demic;
473 * otherwise we may violate assumptions in the
474 * crypto cipher modules used to do delayed update
475 * of replay sequence numbers.
476 */
477 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
478 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
479 /*
480 * Discard encrypted frames when privacy is off.
481 */
482 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
483 wh, "WEP", "%s", "PRIVACY off");
484 vap->iv_stats.is_rx_noprivacy++;
485 IEEE80211_NODE_STAT(ni, rx_noprivacy);
486 goto out;
487 }
488 key = ieee80211_crypto_decap(ni, m, hdrspace);
489 if (key == NULL) {
490 /* NB: stats+msgs handled in crypto_decap */
491 IEEE80211_NODE_STAT(ni, rx_wepfail);
492 goto out;
493 }
494 wh = mtod(m, struct ieee80211_frame *);
495 wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
496 } else {
497 /* XXX M_WEP and IEEE80211_F_PRIVACY */
498 key = NULL;
499 }
500
501 /*
502 * Save QoS bits for use below--before we strip the header.
503 */
504 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
505 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
506 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
507 ((struct ieee80211_qosframe *)wh)->i_qos[0];
508 } else
509 qos = 0;
510
511 /*
512 * Next up, any fragmentation.
513 */
514 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
515 m = ieee80211_defrag(ni, m, hdrspace);
516 if (m == NULL) {
517 /* Fragment dropped or frame not complete yet */
518 goto out;
519 }
520 }
521 wh = NULL; /* no longer valid, catch any uses */
522
523 /*
524 * Next strip any MSDU crypto bits.
525 */
526 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
527 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
528 ni->ni_macaddr, "data", "%s", "demic error");
529 vap->iv_stats.is_rx_demicfail++;
530 IEEE80211_NODE_STAT(ni, rx_demicfail);
531 goto out;
532 }
533
534 /* copy to listener after decrypt */
535 if (ieee80211_radiotap_active_vap(vap))
536 ieee80211_radiotap_rx(vap, m);
537 need_tap = 0;
538
539 /*
540 * Finally, strip the 802.11 header.
541 */
542 m = ieee80211_decap(vap, m, hdrspace);
543 if (m == NULL) {
544 /* XXX mask bit to check for both */
545 /* don't count Null data frames as errors */
546 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
547 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
548 goto out;
549 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
550 ni->ni_macaddr, "data", "%s", "decap error");
551 vap->iv_stats.is_rx_decap++;
552 IEEE80211_NODE_STAT(ni, rx_decap);
553 goto err;
554 }
555 eh = mtod(m, struct ether_header *);
556 if (!ieee80211_node_is_authorized(ni)) {
557 /*
558 * Deny any non-PAE frames received prior to
559 * authorization. For open/shared-key
560 * authentication the port is mark authorized
561 * after authentication completes. For 802.1x
562 * the port is not marked authorized by the
563 * authenticator until the handshake has completed.
564 */
565 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
566 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
567 eh->ether_shost, "data",
568 "unauthorized port: ether type 0x%x len %u",
569 eh->ether_type, m->m_pkthdr.len);
570 vap->iv_stats.is_rx_unauth++;
571 IEEE80211_NODE_STAT(ni, rx_unauth);
572 goto err;
573 }
574 } else {
575 /*
576 * When denying unencrypted frames, discard
577 * any non-PAE frames received without encryption.
578 */
579 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
580 (key == NULL && (m->m_flags & M_WEP) == 0) &&
581 eh->ether_type != htons(ETHERTYPE_PAE)) {
582 /*
583 * Drop unencrypted frames.
584 */
585 vap->iv_stats.is_rx_unencrypted++;
586 IEEE80211_NODE_STAT(ni, rx_unencrypted);
587 goto out;
588 }
589 }
590 /* XXX require HT? */
591 if (qos & IEEE80211_QOS_AMSDU) {
592 m = ieee80211_decap_amsdu(ni, m);
593 if (m == NULL)
594 return IEEE80211_FC0_TYPE_DATA;
595 } else {
596 #ifdef IEEE80211_SUPPORT_SUPERG
597 m = ieee80211_decap_fastframe(vap, ni, m);
598 if (m == NULL)
599 return IEEE80211_FC0_TYPE_DATA;
600 #endif
601 }
602 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
603 ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
604 else
605 ieee80211_deliver_data(vap, ni, m);
606 return IEEE80211_FC0_TYPE_DATA;
607
608 case IEEE80211_FC0_TYPE_MGT:
609 vap->iv_stats.is_rx_mgmt++;
610 IEEE80211_NODE_STAT(ni, rx_mgmt);
611 if (dir != IEEE80211_FC1_DIR_NODS) {
612 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
613 wh, "data", "incorrect dir 0x%x", dir);
614 vap->iv_stats.is_rx_wrongdir++;
615 goto err;
616 }
617 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
618 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
619 ni->ni_macaddr, "mgt", "too short: len %u",
620 m->m_pkthdr.len);
621 vap->iv_stats.is_rx_tooshort++;
622 goto out;
623 }
624 #ifdef IEEE80211_DEBUG
625 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
626 ieee80211_msg_dumppkts(vap)) {
627 if_printf(ifp, "received %s from %s rssi %d\n",
628 ieee80211_mgt_subtype_name[subtype >>
629 IEEE80211_FC0_SUBTYPE_SHIFT],
630 ether_sprintf(wh->i_addr2), rssi);
631 }
632 #endif
633 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
634 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
635 wh, NULL, "%s", "WEP set but not permitted");
636 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
637 goto out;
638 }
639 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
640 goto out;
641
642 case IEEE80211_FC0_TYPE_CTL:
643 vap->iv_stats.is_rx_ctl++;
644 IEEE80211_NODE_STAT(ni, rx_ctrl);
645 vap->iv_recv_ctl(ni, m, subtype);
646 goto out;
647
648 default:
649 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
650 wh, "bad", "frame type 0x%x", type);
651 /* should not come here */
652 break;
653 }
654 err:
655 ifp->if_ierrors++;
656 out:
657 if (m != NULL) {
658 if (need_tap && ieee80211_radiotap_active_vap(vap))
659 ieee80211_radiotap_rx(vap, m);
660 m_freem(m);
661 }
662 return type;
663 #undef SEQ_LEQ
664 }
665
666 static int
667 is11bclient(const uint8_t *rates, const uint8_t *xrates)
668 {
669 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
670 int i;
671
672 /* NB: the 11b clients we care about will not have xrates */
673 if (xrates != NULL || rates == NULL)
674 return 0;
675 for (i = 0; i < rates[1]; i++) {
676 int r = rates[2+i] & IEEE80211_RATE_VAL;
677 if (r > 2*11 || ((1<<r) & brates) == 0)
678 return 0;
679 }
680 return 1;
681 }
682
683 static void
684 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
685 int subtype, int rssi, int nf)
686 {
687 struct ieee80211vap *vap = ni->ni_vap;
688 struct ieee80211com *ic = ni->ni_ic;
689 struct ieee80211_frame *wh;
690 uint8_t *frm, *efrm, *sfrm;
691 uint8_t *ssid, *rates, *xrates;
692
693 wh = mtod(m0, struct ieee80211_frame *);
694 frm = (uint8_t *)&wh[1];
695 efrm = mtod(m0, uint8_t *) + m0->m_len;
696 switch (subtype) {
697 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
698 case IEEE80211_FC0_SUBTYPE_BEACON: {
699 struct ieee80211_scanparams scan;
700 /*
701 * We process beacon/probe response
702 * frames to discover neighbors.
703 */
704 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
705 return;
706 /*
707 * Count frame now that we know it's to be processed.
708 */
709 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
710 vap->iv_stats.is_rx_beacon++; /* XXX remove */
711 IEEE80211_NODE_STAT(ni, rx_beacons);
712 } else
713 IEEE80211_NODE_STAT(ni, rx_proberesp);
714 /*
715 * If scanning, just pass information to the scan module.
716 */
717 if (ic->ic_flags & IEEE80211_F_SCAN) {
718 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
719 /*
720 * Actively scanning a channel marked passive;
721 * send a probe request now that we know there
722 * is 802.11 traffic present.
723 *
724 * XXX check if the beacon we recv'd gives
725 * us what we need and suppress the probe req
726 */
727 ieee80211_probe_curchan(vap, 1);
728 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
729 }
730 ieee80211_add_scan(vap, &scan, wh, 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 if (ni != NULL) {
753 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
754 ni->ni_noise = nf;
755 }
756 }
757 break;
758 }
759
760 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
761 if (vap->iv_state != IEEE80211_S_RUN) {
762 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
763 wh, NULL, "wrong state %s",
764 ieee80211_state_name[vap->iv_state]);
765 vap->iv_stats.is_rx_mgtdiscard++;
766 return;
767 }
768 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
769 /* frame must be directed */
770 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
771 wh, NULL, "%s", "not unicast");
772 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */
773 return;
774 }
775
776 /*
777 * prreq frame format
778 * [tlv] ssid
779 * [tlv] supported rates
780 * [tlv] extended supported rates
781 */
782 ssid = rates = xrates = NULL;
783 sfrm = frm;
784 while (efrm - frm > 1) {
785 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
786 switch (*frm) {
787 case IEEE80211_ELEMID_SSID:
788 ssid = frm;
789 break;
790 case IEEE80211_ELEMID_RATES:
791 rates = frm;
792 break;
793 case IEEE80211_ELEMID_XRATES:
794 xrates = frm;
795 break;
796 }
797 frm += frm[1] + 2;
798 }
799 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
800 if (xrates != NULL)
801 IEEE80211_VERIFY_ELEMENT(xrates,
802 IEEE80211_RATE_MAXSIZE - rates[1], return);
803 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
804 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
805 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
806 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
807 wh, NULL,
808 "%s", "no ssid with ssid suppression enabled");
809 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
810 return;
811 }
812
813 /* XXX find a better class or define it's own */
814 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
815 "%s", "recv probe req");
816 /*
817 * Some legacy 11b clients cannot hack a complete
818 * probe response frame. When the request includes
819 * only a bare-bones rate set, communicate this to
820 * the transmit side.
821 */
822 ieee80211_send_proberesp(vap, wh->i_addr2,
823 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
824 break;
825
826 case IEEE80211_FC0_SUBTYPE_ACTION: {
827 const struct ieee80211_action *ia;
828
829 if (vap->iv_state != IEEE80211_S_RUN) {
830 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
831 wh, NULL, "wrong state %s",
832 ieee80211_state_name[vap->iv_state]);
833 vap->iv_stats.is_rx_mgtdiscard++;
834 return;
835 }
836 /*
837 * action frame format:
838 * [1] category
839 * [1] action
840 * [tlv] parameters
841 */
842 IEEE80211_VERIFY_LENGTH(efrm - frm,
843 sizeof(struct ieee80211_action), return);
844 ia = (const struct ieee80211_action *) frm;
845
846 vap->iv_stats.is_rx_action++;
847 IEEE80211_NODE_STAT(ni, rx_action);
848
849 /* verify frame payloads but defer processing */
850 /* XXX maybe push this to method */
851 switch (ia->ia_category) {
852 case IEEE80211_ACTION_CAT_BA:
853 switch (ia->ia_action) {
854 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
855 IEEE80211_VERIFY_LENGTH(efrm - frm,
856 sizeof(struct ieee80211_action_ba_addbarequest),
857 return);
858 break;
859 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
860 IEEE80211_VERIFY_LENGTH(efrm - frm,
861 sizeof(struct ieee80211_action_ba_addbaresponse),
862 return);
863 break;
864 case IEEE80211_ACTION_BA_DELBA:
865 IEEE80211_VERIFY_LENGTH(efrm - frm,
866 sizeof(struct ieee80211_action_ba_delba),
867 return);
868 break;
869 }
870 break;
871 case IEEE80211_ACTION_CAT_HT:
872 switch (ia->ia_action) {
873 case IEEE80211_ACTION_HT_TXCHWIDTH:
874 IEEE80211_VERIFY_LENGTH(efrm - frm,
875 sizeof(struct ieee80211_action_ht_txchwidth),
876 return);
877 break;
878 }
879 break;
880 }
881 ic->ic_recv_action(ni, wh, frm, efrm);
882 break;
883 }
884
885 case IEEE80211_FC0_SUBTYPE_AUTH:
886 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
887 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
888 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
889 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
890 case IEEE80211_FC0_SUBTYPE_DEAUTH:
891 case IEEE80211_FC0_SUBTYPE_DISASSOC:
892 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
893 wh, NULL, "%s", "not handled");
894 vap->iv_stats.is_rx_mgtdiscard++;
895 return;
896
897 default:
898 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
899 wh, "mgt", "subtype 0x%x not handled", subtype);
900 vap->iv_stats.is_rx_badsubtype++;
901 break;
902 }
903 }
904 #undef IEEE80211_VERIFY_LENGTH
905 #undef IEEE80211_VERIFY_ELEMENT
906
907 static void
908 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
909 int subtype, int rssi, int nf)
910 {
911 struct ieee80211vap *vap = ni->ni_vap;
912 struct ieee80211com *ic = ni->ni_ic;
913
914 /*
915 * Process management frames when scanning; useful for doing
916 * a site-survey.
917 */
918 if (ic->ic_flags & IEEE80211_F_SCAN)
919 adhoc_recv_mgmt(ni, m0, subtype, rssi, nf);
920 else
921 vap->iv_stats.is_rx_mgtdiscard++;
922 }
923
924 static void
925 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype)
926 {
927 }
Cache object: 47bc47f0a2ee178135ff9ebfdee9a856
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