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/8.1/sys/net80211/ieee80211_adhoc.c 199583 2009-11-20 15:27:52Z jhb $");
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;
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 need_tap = 1; /* mbuf need to be tapped. */
322 type = -1; /* undefined */
323
324 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
325 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
326 ni->ni_macaddr, NULL,
327 "too short (1): len %u", m->m_pkthdr.len);
328 vap->iv_stats.is_rx_tooshort++;
329 goto out;
330 }
331 /*
332 * Bit of a cheat here, we use a pointer for a 3-address
333 * frame format but don't reference fields past outside
334 * ieee80211_frame_min w/o first validating the data is
335 * present.
336 */
337 wh = mtod(m, struct ieee80211_frame *);
338
339 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
340 IEEE80211_FC0_VERSION_0) {
341 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
342 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
343 wh->i_fc[0], wh->i_fc[1]);
344 vap->iv_stats.is_rx_badversion++;
345 goto err;
346 }
347
348 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
349 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
350 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
351 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
352 if (dir != IEEE80211_FC1_DIR_NODS)
353 bssid = wh->i_addr1;
354 else if (type == IEEE80211_FC0_TYPE_CTL)
355 bssid = wh->i_addr1;
356 else {
357 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
358 IEEE80211_DISCARD_MAC(vap,
359 IEEE80211_MSG_ANY, ni->ni_macaddr,
360 NULL, "too short (2): len %u",
361 m->m_pkthdr.len);
362 vap->iv_stats.is_rx_tooshort++;
363 goto out;
364 }
365 bssid = wh->i_addr3;
366 }
367 /*
368 * Validate the bssid.
369 */
370 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
371 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
372 /* not interested in */
373 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
374 bssid, NULL, "%s", "not to bss");
375 vap->iv_stats.is_rx_wrongbss++;
376 goto out;
377 }
378 /*
379 * Data frame, cons up a node when it doesn't
380 * exist. This should probably done after an ACL check.
381 */
382 if (type == IEEE80211_FC0_TYPE_DATA &&
383 ni == vap->iv_bss &&
384 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
385 /*
386 * Beware of frames that come in too early; we
387 * can receive broadcast frames and creating sta
388 * entries will blow up because there is no bss
389 * channel yet.
390 */
391 if (vap->iv_state != IEEE80211_S_RUN) {
392 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
393 wh, "data", "not in RUN state (%s)",
394 ieee80211_state_name[vap->iv_state]);
395 vap->iv_stats.is_rx_badstate++;
396 goto err;
397 }
398 /*
399 * Fake up a node for this newly
400 * discovered member of the IBSS.
401 */
402 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2);
403 if (ni == NULL) {
404 /* NB: stat kept for alloc failure */
405 goto err;
406 }
407 }
408 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
409 ni->ni_noise = nf;
410 if (HAS_SEQ(type)) {
411 uint8_t tid = ieee80211_gettid(wh);
412 if (IEEE80211_QOS_HAS_SEQ(wh) &&
413 TID_TO_WME_AC(tid) >= WME_AC_VI)
414 ic->ic_wme.wme_hipri_traffic++;
415 rxseq = le16toh(*(uint16_t *)wh->i_seq);
416 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
417 (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
418 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
419 /* duplicate, discard */
420 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
421 bssid, "duplicate",
422 "seqno <%u,%u> fragno <%u,%u> tid %u",
423 rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
424 ni->ni_rxseqs[tid] >>
425 IEEE80211_SEQ_SEQ_SHIFT,
426 rxseq & IEEE80211_SEQ_FRAG_MASK,
427 ni->ni_rxseqs[tid] &
428 IEEE80211_SEQ_FRAG_MASK,
429 tid);
430 vap->iv_stats.is_rx_dup++;
431 IEEE80211_NODE_STAT(ni, rx_dup);
432 goto out;
433 }
434 ni->ni_rxseqs[tid] = rxseq;
435 }
436 }
437
438 switch (type) {
439 case IEEE80211_FC0_TYPE_DATA:
440 hdrspace = ieee80211_hdrspace(ic, wh);
441 if (m->m_len < hdrspace &&
442 (m = m_pullup(m, hdrspace)) == NULL) {
443 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
444 ni->ni_macaddr, NULL,
445 "data too short: expecting %u", hdrspace);
446 vap->iv_stats.is_rx_tooshort++;
447 goto out; /* XXX */
448 }
449 if (dir != IEEE80211_FC1_DIR_NODS) {
450 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
451 wh, "data", "incorrect dir 0x%x", dir);
452 vap->iv_stats.is_rx_wrongdir++;
453 goto out;
454 }
455 /* XXX no power-save support */
456
457 /*
458 * Handle A-MPDU re-ordering. If the frame is to be
459 * processed directly then ieee80211_ampdu_reorder
460 * will return 0; otherwise it has consumed the mbuf
461 * and we should do nothing more with it.
462 */
463 if ((m->m_flags & M_AMPDU) &&
464 ieee80211_ampdu_reorder(ni, m) != 0) {
465 m = NULL;
466 goto out;
467 }
468 resubmit_ampdu:
469
470 /*
471 * Handle privacy requirements. Note that we
472 * must not be preempted from here until after
473 * we (potentially) call ieee80211_crypto_demic;
474 * otherwise we may violate assumptions in the
475 * crypto cipher modules used to do delayed update
476 * of replay sequence numbers.
477 */
478 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
479 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
480 /*
481 * Discard encrypted frames when privacy is off.
482 */
483 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
484 wh, "WEP", "%s", "PRIVACY off");
485 vap->iv_stats.is_rx_noprivacy++;
486 IEEE80211_NODE_STAT(ni, rx_noprivacy);
487 goto out;
488 }
489 key = ieee80211_crypto_decap(ni, m, hdrspace);
490 if (key == NULL) {
491 /* NB: stats+msgs handled in crypto_decap */
492 IEEE80211_NODE_STAT(ni, rx_wepfail);
493 goto out;
494 }
495 wh = mtod(m, struct ieee80211_frame *);
496 wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
497 } else {
498 /* XXX M_WEP and IEEE80211_F_PRIVACY */
499 key = NULL;
500 }
501
502 /*
503 * Save QoS bits for use below--before we strip the header.
504 */
505 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
506 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
507 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
508 ((struct ieee80211_qosframe *)wh)->i_qos[0];
509 } else
510 qos = 0;
511
512 /*
513 * Next up, any fragmentation.
514 */
515 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
516 m = ieee80211_defrag(ni, m, hdrspace);
517 if (m == NULL) {
518 /* Fragment dropped or frame not complete yet */
519 goto out;
520 }
521 }
522 wh = NULL; /* no longer valid, catch any uses */
523
524 /*
525 * Next strip any MSDU crypto bits.
526 */
527 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
528 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
529 ni->ni_macaddr, "data", "%s", "demic error");
530 vap->iv_stats.is_rx_demicfail++;
531 IEEE80211_NODE_STAT(ni, rx_demicfail);
532 goto out;
533 }
534
535 /* copy to listener after decrypt */
536 if (ieee80211_radiotap_active_vap(vap))
537 ieee80211_radiotap_rx(vap, m);
538 need_tap = 0;
539
540 /*
541 * Finally, strip the 802.11 header.
542 */
543 m = ieee80211_decap(vap, m, hdrspace);
544 if (m == NULL) {
545 /* XXX mask bit to check for both */
546 /* don't count Null data frames as errors */
547 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
548 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
549 goto out;
550 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
551 ni->ni_macaddr, "data", "%s", "decap error");
552 vap->iv_stats.is_rx_decap++;
553 IEEE80211_NODE_STAT(ni, rx_decap);
554 goto err;
555 }
556 eh = mtod(m, struct ether_header *);
557 if (!ieee80211_node_is_authorized(ni)) {
558 /*
559 * Deny any non-PAE frames received prior to
560 * authorization. For open/shared-key
561 * authentication the port is mark authorized
562 * after authentication completes. For 802.1x
563 * the port is not marked authorized by the
564 * authenticator until the handshake has completed.
565 */
566 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
567 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
568 eh->ether_shost, "data",
569 "unauthorized port: ether type 0x%x len %u",
570 eh->ether_type, m->m_pkthdr.len);
571 vap->iv_stats.is_rx_unauth++;
572 IEEE80211_NODE_STAT(ni, rx_unauth);
573 goto err;
574 }
575 } else {
576 /*
577 * When denying unencrypted frames, discard
578 * any non-PAE frames received without encryption.
579 */
580 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
581 (key == NULL && (m->m_flags & M_WEP) == 0) &&
582 eh->ether_type != htons(ETHERTYPE_PAE)) {
583 /*
584 * Drop unencrypted frames.
585 */
586 vap->iv_stats.is_rx_unencrypted++;
587 IEEE80211_NODE_STAT(ni, rx_unencrypted);
588 goto out;
589 }
590 }
591 /* XXX require HT? */
592 if (qos & IEEE80211_QOS_AMSDU) {
593 m = ieee80211_decap_amsdu(ni, m);
594 if (m == NULL)
595 return IEEE80211_FC0_TYPE_DATA;
596 } else {
597 #ifdef IEEE80211_SUPPORT_SUPERG
598 m = ieee80211_decap_fastframe(vap, ni, m);
599 if (m == NULL)
600 return IEEE80211_FC0_TYPE_DATA;
601 #endif
602 }
603 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
604 ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
605 else
606 ieee80211_deliver_data(vap, ni, m);
607 return IEEE80211_FC0_TYPE_DATA;
608
609 case IEEE80211_FC0_TYPE_MGT:
610 vap->iv_stats.is_rx_mgmt++;
611 IEEE80211_NODE_STAT(ni, rx_mgmt);
612 if (dir != IEEE80211_FC1_DIR_NODS) {
613 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
614 wh, "data", "incorrect dir 0x%x", dir);
615 vap->iv_stats.is_rx_wrongdir++;
616 goto err;
617 }
618 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
619 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
620 ni->ni_macaddr, "mgt", "too short: len %u",
621 m->m_pkthdr.len);
622 vap->iv_stats.is_rx_tooshort++;
623 goto out;
624 }
625 #ifdef IEEE80211_DEBUG
626 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
627 ieee80211_msg_dumppkts(vap)) {
628 if_printf(ifp, "received %s from %s rssi %d\n",
629 ieee80211_mgt_subtype_name[subtype >>
630 IEEE80211_FC0_SUBTYPE_SHIFT],
631 ether_sprintf(wh->i_addr2), rssi);
632 }
633 #endif
634 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
635 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
636 wh, NULL, "%s", "WEP set but not permitted");
637 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
638 goto out;
639 }
640 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
641 goto out;
642
643 case IEEE80211_FC0_TYPE_CTL:
644 vap->iv_stats.is_rx_ctl++;
645 IEEE80211_NODE_STAT(ni, rx_ctrl);
646 vap->iv_recv_ctl(ni, m, subtype);
647 goto out;
648
649 default:
650 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
651 wh, "bad", "frame type 0x%x", type);
652 /* should not come here */
653 break;
654 }
655 err:
656 ifp->if_ierrors++;
657 out:
658 if (m != NULL) {
659 if (need_tap && ieee80211_radiotap_active_vap(vap))
660 ieee80211_radiotap_rx(vap, m);
661 m_freem(m);
662 }
663 return type;
664 #undef SEQ_LEQ
665 }
666
667 static int
668 is11bclient(const uint8_t *rates, const uint8_t *xrates)
669 {
670 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
671 int i;
672
673 /* NB: the 11b clients we care about will not have xrates */
674 if (xrates != NULL || rates == NULL)
675 return 0;
676 for (i = 0; i < rates[1]; i++) {
677 int r = rates[2+i] & IEEE80211_RATE_VAL;
678 if (r > 2*11 || ((1<<r) & brates) == 0)
679 return 0;
680 }
681 return 1;
682 }
683
684 static void
685 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
686 int subtype, int rssi, int nf)
687 {
688 struct ieee80211vap *vap = ni->ni_vap;
689 struct ieee80211com *ic = ni->ni_ic;
690 struct ieee80211_frame *wh;
691 uint8_t *frm, *efrm, *sfrm;
692 uint8_t *ssid, *rates, *xrates;
693
694 wh = mtod(m0, struct ieee80211_frame *);
695 frm = (uint8_t *)&wh[1];
696 efrm = mtod(m0, uint8_t *) + m0->m_len;
697 switch (subtype) {
698 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
699 case IEEE80211_FC0_SUBTYPE_BEACON: {
700 struct ieee80211_scanparams scan;
701 /*
702 * We process beacon/probe response
703 * frames to discover neighbors.
704 */
705 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
706 return;
707 /*
708 * Count frame now that we know it's to be processed.
709 */
710 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
711 vap->iv_stats.is_rx_beacon++; /* XXX remove */
712 IEEE80211_NODE_STAT(ni, rx_beacons);
713 } else
714 IEEE80211_NODE_STAT(ni, rx_proberesp);
715 /*
716 * If scanning, just pass information to the scan module.
717 */
718 if (ic->ic_flags & IEEE80211_F_SCAN) {
719 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
720 /*
721 * Actively scanning a channel marked passive;
722 * send a probe request now that we know there
723 * is 802.11 traffic present.
724 *
725 * XXX check if the beacon we recv'd gives
726 * us what we need and suppress the probe req
727 */
728 ieee80211_probe_curchan(vap, 1);
729 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
730 }
731 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
732 return;
733 }
734 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
735 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
736 /*
737 * Create a new entry in the neighbor table.
738 */
739 ni = ieee80211_add_neighbor(vap, wh, &scan);
740 } else if (ni->ni_capinfo == 0) {
741 /*
742 * Update faked node created on transmit.
743 * Note this also updates the tsf.
744 */
745 ieee80211_init_neighbor(ni, wh, &scan);
746 } else {
747 /*
748 * Record tsf for potential resync.
749 */
750 memcpy(ni->ni_tstamp.data, scan.tstamp,
751 sizeof(ni->ni_tstamp));
752 }
753 if (ni != NULL) {
754 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
755 ni->ni_noise = nf;
756 }
757 }
758 break;
759 }
760
761 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
762 if (vap->iv_state != IEEE80211_S_RUN) {
763 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
764 wh, NULL, "wrong state %s",
765 ieee80211_state_name[vap->iv_state]);
766 vap->iv_stats.is_rx_mgtdiscard++;
767 return;
768 }
769 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
770 /* frame must be directed */
771 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
772 wh, NULL, "%s", "not unicast");
773 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */
774 return;
775 }
776
777 /*
778 * prreq frame format
779 * [tlv] ssid
780 * [tlv] supported rates
781 * [tlv] extended supported rates
782 */
783 ssid = rates = xrates = NULL;
784 sfrm = frm;
785 while (efrm - frm > 1) {
786 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
787 switch (*frm) {
788 case IEEE80211_ELEMID_SSID:
789 ssid = frm;
790 break;
791 case IEEE80211_ELEMID_RATES:
792 rates = frm;
793 break;
794 case IEEE80211_ELEMID_XRATES:
795 xrates = frm;
796 break;
797 }
798 frm += frm[1] + 2;
799 }
800 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
801 if (xrates != NULL)
802 IEEE80211_VERIFY_ELEMENT(xrates,
803 IEEE80211_RATE_MAXSIZE - rates[1], return);
804 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
805 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
806 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
807 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
808 wh, NULL,
809 "%s", "no ssid with ssid suppression enabled");
810 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
811 return;
812 }
813
814 /* XXX find a better class or define it's own */
815 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
816 "%s", "recv probe req");
817 /*
818 * Some legacy 11b clients cannot hack a complete
819 * probe response frame. When the request includes
820 * only a bare-bones rate set, communicate this to
821 * the transmit side.
822 */
823 ieee80211_send_proberesp(vap, wh->i_addr2,
824 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
825 break;
826
827 case IEEE80211_FC0_SUBTYPE_ACTION: {
828 const struct ieee80211_action *ia;
829
830 if (vap->iv_state != IEEE80211_S_RUN) {
831 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
832 wh, NULL, "wrong state %s",
833 ieee80211_state_name[vap->iv_state]);
834 vap->iv_stats.is_rx_mgtdiscard++;
835 return;
836 }
837 /*
838 * action frame format:
839 * [1] category
840 * [1] action
841 * [tlv] parameters
842 */
843 IEEE80211_VERIFY_LENGTH(efrm - frm,
844 sizeof(struct ieee80211_action), return);
845 ia = (const struct ieee80211_action *) frm;
846
847 vap->iv_stats.is_rx_action++;
848 IEEE80211_NODE_STAT(ni, rx_action);
849
850 /* verify frame payloads but defer processing */
851 /* XXX maybe push this to method */
852 switch (ia->ia_category) {
853 case IEEE80211_ACTION_CAT_BA:
854 switch (ia->ia_action) {
855 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
856 IEEE80211_VERIFY_LENGTH(efrm - frm,
857 sizeof(struct ieee80211_action_ba_addbarequest),
858 return);
859 break;
860 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
861 IEEE80211_VERIFY_LENGTH(efrm - frm,
862 sizeof(struct ieee80211_action_ba_addbaresponse),
863 return);
864 break;
865 case IEEE80211_ACTION_BA_DELBA:
866 IEEE80211_VERIFY_LENGTH(efrm - frm,
867 sizeof(struct ieee80211_action_ba_delba),
868 return);
869 break;
870 }
871 break;
872 case IEEE80211_ACTION_CAT_HT:
873 switch (ia->ia_action) {
874 case IEEE80211_ACTION_HT_TXCHWIDTH:
875 IEEE80211_VERIFY_LENGTH(efrm - frm,
876 sizeof(struct ieee80211_action_ht_txchwidth),
877 return);
878 break;
879 }
880 break;
881 }
882 ic->ic_recv_action(ni, wh, frm, efrm);
883 break;
884 }
885
886 case IEEE80211_FC0_SUBTYPE_AUTH:
887 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
888 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
889 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
890 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
891 case IEEE80211_FC0_SUBTYPE_DEAUTH:
892 case IEEE80211_FC0_SUBTYPE_DISASSOC:
893 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
894 wh, NULL, "%s", "not handled");
895 vap->iv_stats.is_rx_mgtdiscard++;
896 return;
897
898 default:
899 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
900 wh, "mgt", "subtype 0x%x not handled", subtype);
901 vap->iv_stats.is_rx_badsubtype++;
902 break;
903 }
904 }
905 #undef IEEE80211_VERIFY_LENGTH
906 #undef IEEE80211_VERIFY_ELEMENT
907
908 static void
909 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
910 int subtype, int rssi, int nf)
911 {
912 struct ieee80211vap *vap = ni->ni_vap;
913 struct ieee80211com *ic = ni->ni_ic;
914
915 /*
916 * Process management frames when scanning; useful for doing
917 * a site-survey.
918 */
919 if (ic->ic_flags & IEEE80211_F_SCAN)
920 adhoc_recv_mgmt(ni, m0, subtype, rssi, nf);
921 else
922 vap->iv_stats.is_rx_mgtdiscard++;
923 }
924
925 static void
926 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype)
927 {
928 }
Cache object: 1a8be799648edbb9baca77b5bba6f016
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