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 <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
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 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
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 uint16_t rxseq;
306
307 if (m->m_flags & M_AMPDU_MPDU) {
308 /*
309 * Fastpath for A-MPDU reorder q resubmission. Frames
310 * w/ M_AMPDU_MPDU marked have already passed through
311 * here but were received out of order and been held on
312 * the reorder queue. When resubmitted they are marked
313 * with the M_AMPDU_MPDU flag and we can bypass most of
314 * the normal processing.
315 */
316 wh = mtod(m, struct ieee80211_frame *);
317 type = IEEE80211_FC0_TYPE_DATA;
318 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
319 subtype = IEEE80211_FC0_SUBTYPE_QOS;
320 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
321 goto resubmit_ampdu;
322 }
323
324 KASSERT(ni != NULL, ("null node"));
325 ni->ni_inact = ni->ni_inact_reload;
326
327 type = -1; /* undefined */
328
329 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
330 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
331 ni->ni_macaddr, NULL,
332 "too short (1): len %u", m->m_pkthdr.len);
333 vap->iv_stats.is_rx_tooshort++;
334 goto out;
335 }
336 /*
337 * Bit of a cheat here, we use a pointer for a 3-address
338 * frame format but don't reference fields past outside
339 * ieee80211_frame_min w/o first validating the data is
340 * present.
341 */
342 wh = mtod(m, struct ieee80211_frame *);
343
344 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
345 IEEE80211_FC0_VERSION_0) {
346 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
347 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
348 wh->i_fc[0], wh->i_fc[1]);
349 vap->iv_stats.is_rx_badversion++;
350 goto err;
351 }
352
353 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
354 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
355 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
356 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
357 if (dir != IEEE80211_FC1_DIR_NODS)
358 bssid = wh->i_addr1;
359 else if (type == IEEE80211_FC0_TYPE_CTL)
360 bssid = wh->i_addr1;
361 else {
362 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
363 IEEE80211_DISCARD_MAC(vap,
364 IEEE80211_MSG_ANY, ni->ni_macaddr,
365 NULL, "too short (2): len %u",
366 m->m_pkthdr.len);
367 vap->iv_stats.is_rx_tooshort++;
368 goto out;
369 }
370 bssid = wh->i_addr3;
371 }
372 /*
373 * Validate the bssid.
374 */
375 if (!(type == IEEE80211_FC0_TYPE_MGT &&
376 (subtype == IEEE80211_FC0_SUBTYPE_BEACON ||
377 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)) &&
378 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
379 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
380 /* not interested in */
381 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
382 bssid, NULL, "%s", "not to bss");
383 vap->iv_stats.is_rx_wrongbss++;
384 goto out;
385 }
386 /*
387 * Data frame, cons up a node when it doesn't
388 * exist. This should probably done after an ACL check.
389 */
390 if (type == IEEE80211_FC0_TYPE_DATA &&
391 ni == vap->iv_bss &&
392 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
393 /*
394 * Beware of frames that come in too early; we
395 * can receive broadcast frames and creating sta
396 * entries will blow up because there is no bss
397 * channel yet.
398 */
399 if (vap->iv_state != IEEE80211_S_RUN) {
400 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
401 wh, "data", "not in RUN state (%s)",
402 ieee80211_state_name[vap->iv_state]);
403 vap->iv_stats.is_rx_badstate++;
404 goto err;
405 }
406 /*
407 * Fake up a node for this newly
408 * discovered member of the IBSS.
409 */
410 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2);
411 if (ni == NULL) {
412 /* NB: stat kept for alloc failure */
413 goto err;
414 }
415 }
416 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
417 ni->ni_noise = nf;
418 if (IEEE80211_HAS_SEQ(type, subtype) &&
419 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
420 uint8_t tid = ieee80211_gettid(wh);
421 if (IEEE80211_QOS_HAS_SEQ(wh) &&
422 TID_TO_WME_AC(tid) >= WME_AC_VI)
423 ic->ic_wme.wme_hipri_traffic++;
424 rxseq = le16toh(*(uint16_t *)wh->i_seq);
425 if (! ieee80211_check_rxseq(ni, wh)) {
426 /* duplicate, discard */
427 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
428 bssid, "duplicate",
429 "seqno <%u,%u> fragno <%u,%u> tid %u",
430 rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
431 ni->ni_rxseqs[tid] >>
432 IEEE80211_SEQ_SEQ_SHIFT,
433 rxseq & IEEE80211_SEQ_FRAG_MASK,
434 ni->ni_rxseqs[tid] &
435 IEEE80211_SEQ_FRAG_MASK,
436 tid);
437 vap->iv_stats.is_rx_dup++;
438 IEEE80211_NODE_STAT(ni, rx_dup);
439 goto out;
440 }
441 ni->ni_rxseqs[tid] = rxseq;
442 }
443 }
444
445 switch (type) {
446 case IEEE80211_FC0_TYPE_DATA:
447 hdrspace = ieee80211_hdrspace(ic, wh);
448 if (m->m_len < hdrspace &&
449 (m = m_pullup(m, hdrspace)) == NULL) {
450 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
451 ni->ni_macaddr, NULL,
452 "data too short: expecting %u", hdrspace);
453 vap->iv_stats.is_rx_tooshort++;
454 goto out; /* XXX */
455 }
456 if (dir != IEEE80211_FC1_DIR_NODS) {
457 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
458 wh, "data", "incorrect dir 0x%x", dir);
459 vap->iv_stats.is_rx_wrongdir++;
460 goto out;
461 }
462 /* XXX no power-save support */
463
464 /*
465 * Handle A-MPDU re-ordering. If the frame is to be
466 * processed directly then ieee80211_ampdu_reorder
467 * will return 0; otherwise it has consumed the mbuf
468 * and we should do nothing more with it.
469 */
470 if ((m->m_flags & M_AMPDU) &&
471 ieee80211_ampdu_reorder(ni, m) != 0) {
472 m = NULL;
473 goto out;
474 }
475 resubmit_ampdu:
476
477 /*
478 * Handle privacy requirements. Note that we
479 * must not be preempted from here until after
480 * we (potentially) call ieee80211_crypto_demic;
481 * otherwise we may violate assumptions in the
482 * crypto cipher modules used to do delayed update
483 * of replay sequence numbers.
484 */
485 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
486 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
487 /*
488 * Discard encrypted frames when privacy is off.
489 */
490 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
491 wh, "WEP", "%s", "PRIVACY off");
492 vap->iv_stats.is_rx_noprivacy++;
493 IEEE80211_NODE_STAT(ni, rx_noprivacy);
494 goto out;
495 }
496 key = ieee80211_crypto_decap(ni, m, hdrspace);
497 if (key == NULL) {
498 /* NB: stats+msgs handled in crypto_decap */
499 IEEE80211_NODE_STAT(ni, rx_wepfail);
500 goto out;
501 }
502 wh = mtod(m, struct ieee80211_frame *);
503 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
504 } else {
505 /* XXX M_WEP and IEEE80211_F_PRIVACY */
506 key = NULL;
507 }
508
509 /*
510 * Save QoS bits for use below--before we strip the header.
511 */
512 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
513 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
514 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
515 ((struct ieee80211_qosframe *)wh)->i_qos[0];
516 } else
517 qos = 0;
518
519 /*
520 * Next up, any fragmentation.
521 */
522 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
523 m = ieee80211_defrag(ni, m, hdrspace);
524 if (m == NULL) {
525 /* Fragment dropped or frame not complete yet */
526 goto out;
527 }
528 }
529 wh = NULL; /* no longer valid, catch any uses */
530
531 /*
532 * Next strip any MSDU crypto bits.
533 */
534 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
535 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
536 ni->ni_macaddr, "data", "%s", "demic error");
537 vap->iv_stats.is_rx_demicfail++;
538 IEEE80211_NODE_STAT(ni, rx_demicfail);
539 goto out;
540 }
541
542 /* copy to listener after decrypt */
543 if (ieee80211_radiotap_active_vap(vap))
544 ieee80211_radiotap_rx(vap, m);
545 need_tap = 0;
546
547 /*
548 * Finally, strip the 802.11 header.
549 */
550 m = ieee80211_decap(vap, m, hdrspace);
551 if (m == NULL) {
552 /* XXX mask bit to check for both */
553 /* don't count Null data frames as errors */
554 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
555 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
556 goto out;
557 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
558 ni->ni_macaddr, "data", "%s", "decap error");
559 vap->iv_stats.is_rx_decap++;
560 IEEE80211_NODE_STAT(ni, rx_decap);
561 goto err;
562 }
563 eh = mtod(m, struct ether_header *);
564 if (!ieee80211_node_is_authorized(ni)) {
565 /*
566 * Deny any non-PAE frames received prior to
567 * authorization. For open/shared-key
568 * authentication the port is mark authorized
569 * after authentication completes. For 802.1x
570 * the port is not marked authorized by the
571 * authenticator until the handshake has completed.
572 */
573 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
574 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
575 eh->ether_shost, "data",
576 "unauthorized port: ether type 0x%x len %u",
577 eh->ether_type, m->m_pkthdr.len);
578 vap->iv_stats.is_rx_unauth++;
579 IEEE80211_NODE_STAT(ni, rx_unauth);
580 goto err;
581 }
582 } else {
583 /*
584 * When denying unencrypted frames, discard
585 * any non-PAE frames received without encryption.
586 */
587 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
588 (key == NULL && (m->m_flags & M_WEP) == 0) &&
589 eh->ether_type != htons(ETHERTYPE_PAE)) {
590 /*
591 * Drop unencrypted frames.
592 */
593 vap->iv_stats.is_rx_unencrypted++;
594 IEEE80211_NODE_STAT(ni, rx_unencrypted);
595 goto out;
596 }
597 }
598 /* XXX require HT? */
599 if (qos & IEEE80211_QOS_AMSDU) {
600 m = ieee80211_decap_amsdu(ni, m);
601 if (m == NULL)
602 return IEEE80211_FC0_TYPE_DATA;
603 } else {
604 #ifdef IEEE80211_SUPPORT_SUPERG
605 m = ieee80211_decap_fastframe(vap, ni, m);
606 if (m == NULL)
607 return IEEE80211_FC0_TYPE_DATA;
608 #endif
609 }
610 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
611 ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
612 else
613 ieee80211_deliver_data(vap, ni, m);
614 return IEEE80211_FC0_TYPE_DATA;
615
616 case IEEE80211_FC0_TYPE_MGT:
617 vap->iv_stats.is_rx_mgmt++;
618 IEEE80211_NODE_STAT(ni, rx_mgmt);
619 if (dir != IEEE80211_FC1_DIR_NODS) {
620 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
621 wh, "data", "incorrect dir 0x%x", dir);
622 vap->iv_stats.is_rx_wrongdir++;
623 goto err;
624 }
625 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
626 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
627 ni->ni_macaddr, "mgt", "too short: len %u",
628 m->m_pkthdr.len);
629 vap->iv_stats.is_rx_tooshort++;
630 goto out;
631 }
632 #ifdef IEEE80211_DEBUG
633 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
634 ieee80211_msg_dumppkts(vap)) {
635 if_printf(ifp, "received %s from %s rssi %d\n",
636 ieee80211_mgt_subtype_name[subtype >>
637 IEEE80211_FC0_SUBTYPE_SHIFT],
638 ether_sprintf(wh->i_addr2), rssi);
639 }
640 #endif
641 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
642 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
643 wh, NULL, "%s", "WEP set but not permitted");
644 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
645 goto out;
646 }
647 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
648 goto out;
649
650 case IEEE80211_FC0_TYPE_CTL:
651 vap->iv_stats.is_rx_ctl++;
652 IEEE80211_NODE_STAT(ni, rx_ctrl);
653 vap->iv_recv_ctl(ni, m, subtype);
654 goto out;
655
656 default:
657 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
658 wh, "bad", "frame type 0x%x", type);
659 /* should not come here */
660 break;
661 }
662 err:
663 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
664 out:
665 if (m != NULL) {
666 if (need_tap && ieee80211_radiotap_active_vap(vap))
667 ieee80211_radiotap_rx(vap, m);
668 m_freem(m);
669 }
670 return type;
671 }
672
673 static int
is11bclient(const uint8_t * rates,const uint8_t * xrates)674 is11bclient(const uint8_t *rates, const uint8_t *xrates)
675 {
676 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
677 int i;
678
679 /* NB: the 11b clients we care about will not have xrates */
680 if (xrates != NULL || rates == NULL)
681 return 0;
682 for (i = 0; i < rates[1]; i++) {
683 int r = rates[2+i] & IEEE80211_RATE_VAL;
684 if (r > 2*11 || ((1<<r) & brates) == 0)
685 return 0;
686 }
687 return 1;
688 }
689
690 static void
adhoc_recv_mgmt(struct ieee80211_node * ni,struct mbuf * m0,int subtype,const struct ieee80211_rx_stats * rxs,int rssi,int nf)691 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
692 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
693 {
694 struct ieee80211vap *vap = ni->ni_vap;
695 struct ieee80211com *ic = ni->ni_ic;
696 struct ieee80211_channel *rxchan = ic->ic_curchan;
697 struct ieee80211_frame *wh;
698 uint8_t *frm, *efrm, *sfrm;
699 uint8_t *ssid, *rates, *xrates;
700 #if 0
701 int ht_state_change = 0;
702 #endif
703
704 wh = mtod(m0, struct ieee80211_frame *);
705 frm = (uint8_t *)&wh[1];
706 efrm = mtod(m0, uint8_t *) + m0->m_len;
707 switch (subtype) {
708 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
709 case IEEE80211_FC0_SUBTYPE_BEACON: {
710 struct ieee80211_scanparams scan;
711 struct ieee80211_channel *c;
712 /*
713 * We process beacon/probe response
714 * frames to discover neighbors.
715 */
716 if (rxs != NULL) {
717 c = ieee80211_lookup_channel_rxstatus(vap, rxs);
718 if (c != NULL)
719 rxchan = c;
720 }
721 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0)
722 return;
723 /*
724 * Count frame now that we know it's to be processed.
725 */
726 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
727 vap->iv_stats.is_rx_beacon++; /* XXX remove */
728 IEEE80211_NODE_STAT(ni, rx_beacons);
729 } else
730 IEEE80211_NODE_STAT(ni, rx_proberesp);
731 /*
732 * If scanning, just pass information to the scan module.
733 */
734 if (ic->ic_flags & IEEE80211_F_SCAN) {
735 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
736 /*
737 * Actively scanning a channel marked passive;
738 * send a probe request now that we know there
739 * is 802.11 traffic present.
740 *
741 * XXX check if the beacon we recv'd gives
742 * us what we need and suppress the probe req
743 */
744 ieee80211_probe_curchan(vap, 1);
745 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
746 }
747 ieee80211_add_scan(vap, rxchan, &scan, wh,
748 subtype, rssi, nf);
749 return;
750 }
751 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
752 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
753 /*
754 * Create a new entry in the neighbor table.
755 */
756 ni = ieee80211_add_neighbor(vap, wh, &scan);
757 } else if (ni->ni_capinfo == 0) {
758 /*
759 * Update faked node created on transmit.
760 * Note this also updates the tsf.
761 */
762 ieee80211_init_neighbor(ni, wh, &scan);
763 } else {
764 /*
765 * Record tsf for potential resync.
766 */
767 memcpy(ni->ni_tstamp.data, scan.tstamp,
768 sizeof(ni->ni_tstamp));
769 }
770 /*
771 * This isn't enabled yet - otherwise it would
772 * update the HT parameters and channel width
773 * from any node, which could lead to lots of
774 * strange behaviour if the 11n nodes aren't
775 * exactly configured to match.
776 */
777 #if 0
778 if (scan.htcap != NULL && scan.htinfo != NULL &&
779 (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
780 if (ieee80211_ht_updateparams(ni,
781 scan.htcap, scan.htinfo))
782 ht_state_change = 1;
783 }
784 #endif
785 if (ni != NULL) {
786 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
787 ni->ni_noise = nf;
788 }
789 /*
790 * Same here - the channel width change should
791 * be applied to the specific peer node, not
792 * to the ic. Ie, the interface configuration
793 * should stay in its current channel width;
794 * but it should change the rate control and
795 * any queued frames for the given node only.
796 *
797 * Since there's no (current) way to inform
798 * the driver that a channel width change has
799 * occured for a single node, just stub this
800 * out.
801 */
802 #if 0
803 if (ht_state_change)
804 ieee80211_update_chw(ic);
805 #endif
806 }
807 break;
808 }
809
810 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
811 if (vap->iv_state != IEEE80211_S_RUN) {
812 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
813 wh, NULL, "wrong state %s",
814 ieee80211_state_name[vap->iv_state]);
815 vap->iv_stats.is_rx_mgtdiscard++;
816 return;
817 }
818 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
819 /* frame must be directed */
820 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
821 wh, NULL, "%s", "not unicast");
822 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */
823 return;
824 }
825
826 /*
827 * prreq frame format
828 * [tlv] ssid
829 * [tlv] supported rates
830 * [tlv] extended supported rates
831 */
832 ssid = rates = xrates = NULL;
833 sfrm = frm;
834 while (efrm - frm > 1) {
835 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
836 switch (*frm) {
837 case IEEE80211_ELEMID_SSID:
838 ssid = frm;
839 break;
840 case IEEE80211_ELEMID_RATES:
841 rates = frm;
842 break;
843 case IEEE80211_ELEMID_XRATES:
844 xrates = frm;
845 break;
846 }
847 frm += frm[1] + 2;
848 }
849 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
850 if (xrates != NULL)
851 IEEE80211_VERIFY_ELEMENT(xrates,
852 IEEE80211_RATE_MAXSIZE - rates[1], return);
853 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
854 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
855 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
856 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
857 wh, NULL,
858 "%s", "no ssid with ssid suppression enabled");
859 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
860 return;
861 }
862
863 /* XXX find a better class or define it's own */
864 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
865 "%s", "recv probe req");
866 /*
867 * Some legacy 11b clients cannot hack a complete
868 * probe response frame. When the request includes
869 * only a bare-bones rate set, communicate this to
870 * the transmit side.
871 */
872 ieee80211_send_proberesp(vap, wh->i_addr2,
873 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
874 break;
875
876 case IEEE80211_FC0_SUBTYPE_ACTION:
877 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
878 if (ni == vap->iv_bss) {
879 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
880 wh, NULL, "%s", "unknown node");
881 vap->iv_stats.is_rx_mgtdiscard++;
882 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
883 !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
884 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
885 wh, NULL, "%s", "not for us");
886 vap->iv_stats.is_rx_mgtdiscard++;
887 } else if (vap->iv_state != IEEE80211_S_RUN) {
888 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
889 wh, NULL, "wrong state %s",
890 ieee80211_state_name[vap->iv_state]);
891 vap->iv_stats.is_rx_mgtdiscard++;
892 } else {
893 if (ieee80211_parse_action(ni, m0) == 0)
894 (void)ic->ic_recv_action(ni, wh, frm, efrm);
895 }
896 break;
897
898 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
899 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
900 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
901 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
902 case IEEE80211_FC0_SUBTYPE_ATIM:
903 case IEEE80211_FC0_SUBTYPE_DISASSOC:
904 case IEEE80211_FC0_SUBTYPE_AUTH:
905 case IEEE80211_FC0_SUBTYPE_DEAUTH:
906 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
907 wh, NULL, "%s", "not handled");
908 vap->iv_stats.is_rx_mgtdiscard++;
909 break;
910
911 default:
912 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
913 wh, "mgt", "subtype 0x%x not handled", subtype);
914 vap->iv_stats.is_rx_badsubtype++;
915 break;
916 }
917 }
918 #undef IEEE80211_VERIFY_LENGTH
919 #undef IEEE80211_VERIFY_ELEMENT
920
921 static void
ahdemo_recv_mgmt(struct ieee80211_node * ni,struct mbuf * m0,int subtype,const struct ieee80211_rx_stats * rxs,int rssi,int nf)922 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
923 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
924 {
925 struct ieee80211vap *vap = ni->ni_vap;
926 struct ieee80211com *ic = ni->ni_ic;
927 struct ieee80211_frame *wh;
928
929 /*
930 * Process management frames when scanning; useful for doing
931 * a site-survey.
932 */
933 if (ic->ic_flags & IEEE80211_F_SCAN)
934 adhoc_recv_mgmt(ni, m0, subtype, rxs, rssi, nf);
935 else {
936 wh = mtod(m0, struct ieee80211_frame *);
937 switch (subtype) {
938 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
939 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
940 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
941 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
942 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
943 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
944 case IEEE80211_FC0_SUBTYPE_BEACON:
945 case IEEE80211_FC0_SUBTYPE_ATIM:
946 case IEEE80211_FC0_SUBTYPE_DISASSOC:
947 case IEEE80211_FC0_SUBTYPE_AUTH:
948 case IEEE80211_FC0_SUBTYPE_DEAUTH:
949 case IEEE80211_FC0_SUBTYPE_ACTION:
950 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
951 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
952 wh, NULL, "%s", "not handled");
953 vap->iv_stats.is_rx_mgtdiscard++;
954 break;
955 default:
956 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
957 wh, "mgt", "subtype 0x%x not handled", subtype);
958 vap->iv_stats.is_rx_badsubtype++;
959 break;
960 }
961 }
962 }
963
964 static void
adhoc_recv_ctl(struct ieee80211_node * ni,struct mbuf * m,int subtype)965 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
966 {
967
968 switch (subtype) {
969 case IEEE80211_FC0_SUBTYPE_BAR:
970 ieee80211_recv_bar(ni, m);
971 break;
972 }
973 }
974