wlan - Update wlan from Adrian / FreeBSD
[dragonfly.git] / sys / netproto / 802_11 / wlan / ieee80211_adhoc.c
CommitLineData
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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.
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24 */
25
085ff963
MD
26#include <sys/cdefs.h>
27#ifdef __FreeBSD__
28__FBSDID("$FreeBSD$");
29#endif
30
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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>
085ff963 51#include <net/if_var.h>
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52#include <net/if_media.h>
53#include <net/if_llc.h>
54#include <net/ethernet.h>
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55
56#include <net/bpf.h>
57
58#include <netproto/802_11/ieee80211_var.h>
59#include <netproto/802_11/ieee80211_adhoc.h>
60#include <netproto/802_11/ieee80211_input.h>
61#ifdef IEEE80211_SUPPORT_SUPERG
62#include <netproto/802_11/ieee80211_superg.h>
63#endif
64#ifdef IEEE80211_SUPPORT_TDMA
65#include <netproto/802_11/ieee80211_tdma.h>
66#endif
085ff963 67#include <netproto/802_11/ieee80211_sta.h>
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68
69#define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2)
70
71static void adhoc_vattach(struct ieee80211vap *);
72static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int);
73static int adhoc_input(struct ieee80211_node *, struct mbuf *, int, int);
74static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *,
75 int subtype, int, int);
76static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *,
77 int subtype, int, int);
78static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
79
80void
81ieee80211_adhoc_attach(struct ieee80211com *ic)
82{
83 ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach;
84 ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach;
85}
86
87void
88ieee80211_adhoc_detach(struct ieee80211com *ic)
89{
90}
91
92static void
93adhoc_vdetach(struct ieee80211vap *vap)
94{
95}
96
97static void
98adhoc_vattach(struct ieee80211vap *vap)
99{
100 vap->iv_newstate = adhoc_newstate;
101 vap->iv_input = adhoc_input;
102 if (vap->iv_opmode == IEEE80211_M_IBSS)
103 vap->iv_recv_mgmt = adhoc_recv_mgmt;
104 else
105 vap->iv_recv_mgmt = ahdemo_recv_mgmt;
106 vap->iv_recv_ctl = adhoc_recv_ctl;
107 vap->iv_opdetach = adhoc_vdetach;
108#ifdef IEEE80211_SUPPORT_TDMA
109 /*
110 * Throw control to tdma support. Note we do this
111 * after setting up our callbacks so it can piggyback
112 * on top of us.
113 */
114 if (vap->iv_caps & IEEE80211_C_TDMA)
115 ieee80211_tdma_vattach(vap);
116#endif
117}
118
119static void
120sta_leave(void *arg, struct ieee80211_node *ni)
121{
122 struct ieee80211vap *vap = arg;
123
124 if (ni->ni_vap == vap && ni != vap->iv_bss)
125 ieee80211_node_leave(ni);
126}
127
128/*
129 * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler.
130 */
131static int
132adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
133{
134 struct ieee80211com *ic = vap->iv_ic;
135 struct ieee80211_node *ni;
136 enum ieee80211_state ostate;
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137
138 IEEE80211_LOCK_ASSERT(vap->iv_ic);
32176cfd 139
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140 ostate = vap->iv_state;
141 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
142 __func__, ieee80211_state_name[ostate],
143 ieee80211_state_name[nstate], arg);
144 vap->iv_state = nstate; /* state transition */
145 if (ostate != IEEE80211_S_SCAN)
146 ieee80211_cancel_scan(vap); /* background scan */
147 ni = vap->iv_bss; /* NB: no reference held */
148 switch (nstate) {
149 case IEEE80211_S_INIT:
150 switch (ostate) {
151 case IEEE80211_S_SCAN:
152 ieee80211_cancel_scan(vap);
153 break;
154 default:
155 break;
156 }
157 if (ostate != IEEE80211_S_INIT) {
158 /* NB: optimize INIT -> INIT case */
159 ieee80211_reset_bss(vap);
160 }
161 break;
162 case IEEE80211_S_SCAN:
163 switch (ostate) {
164 case IEEE80211_S_RUN: /* beacon miss */
165 /* purge station table; entries are stale */
166 ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap);
167 /* fall thru... */
168 case IEEE80211_S_INIT:
169 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
170 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
171 /*
172 * Already have a channel; bypass the
173 * scan and startup immediately.
174 */
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175 ieee80211_create_ibss(vap,
176 ieee80211_ht_adjust_channel(ic,
177 vap->iv_des_chan, vap->iv_flags_ht));
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178 break;
179 }
180 /*
181 * Initiate a scan. We can come here as a result
182 * of an IEEE80211_IOC_SCAN_REQ too in which case
183 * the vap will be marked with IEEE80211_FEXT_SCANREQ
184 * and the scan request parameters will be present
185 * in iv_scanreq. Otherwise we do the default.
186 */
187 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
188 ieee80211_check_scan(vap,
189 vap->iv_scanreq_flags,
190 vap->iv_scanreq_duration,
191 vap->iv_scanreq_mindwell,
192 vap->iv_scanreq_maxdwell,
193 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
194 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
195 } else
196 ieee80211_check_scan_current(vap);
197 break;
198 case IEEE80211_S_SCAN:
199 /*
200 * This can happen because of a change in state
201 * that requires a reset. Trigger a new scan
202 * unless we're in manual roaming mode in which
203 * case an application must issue an explicit request.
204 */
205 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
206 ieee80211_check_scan_current(vap);
207 break;
208 default:
209 goto invalid;
210 }
211 break;
212 case IEEE80211_S_RUN:
213 if (vap->iv_flags & IEEE80211_F_WPA) {
214 /* XXX validate prerequisites */
215 }
216 switch (ostate) {
217 case IEEE80211_S_SCAN:
218#ifdef IEEE80211_DEBUG
219 if (ieee80211_msg_debug(vap)) {
220 ieee80211_note(vap,
1e290df3 221 "synchronized with %s ssid ",
085ff963 222 ether_sprintf(ni->ni_bssid));
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223 ieee80211_print_essid(vap->iv_bss->ni_essid,
224 ni->ni_esslen);
225 /* XXX MCS/HT */
6168f72e 226 kprintf(" channel %d start %uMb\n",
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227 ieee80211_chan2ieee(ic, ic->ic_curchan),
228 IEEE80211_RATE2MBS(ni->ni_txrate));
229 }
230#endif
231 break;
232 default:
233 goto invalid;
234 }
235 /*
236 * When 802.1x is not in use mark the port authorized
237 * at this point so traffic can flow.
238 */
239 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
240 ieee80211_node_authorize(ni);
241 /*
242 * Fake association when joining an existing bss.
243 */
244 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) &&
245 ic->ic_newassoc != NULL)
246 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN);
247 break;
248 case IEEE80211_S_SLEEP:
085ff963 249 vap->iv_sta_ps(vap, 0);
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250 break;
251 default:
252 invalid:
253 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
254 "%s: unexpected state transition %s -> %s\n", __func__,
255 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
256 break;
257 }
258 return 0;
259}
260
261/*
262 * Decide if a received management frame should be
263 * printed when debugging is enabled. This filters some
264 * of the less interesting frames that come frequently
265 * (e.g. beacons).
266 */
267static __inline int
268doprint(struct ieee80211vap *vap, int subtype)
269{
270 switch (subtype) {
271 case IEEE80211_FC0_SUBTYPE_BEACON:
272 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
273 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
274 return 1;
275 }
276 return 1;
277}
278
279/*
280 * Process a received frame. The node associated with the sender
281 * should be supplied. If nothing was found in the node table then
282 * the caller is assumed to supply a reference to iv_bss instead.
283 * The RSSI and a timestamp are also supplied. The RSSI data is used
284 * during AP scanning to select a AP to associate with; it can have
285 * any units so long as values have consistent units and higher values
286 * mean ``better signal''. The receive timestamp is currently not used
287 * by the 802.11 layer.
288 */
289static int
290adhoc_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
291{
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292#define HAS_SEQ(type) ((type & 0x4) == 0)
293 struct ieee80211vap *vap = ni->ni_vap;
294 struct ieee80211com *ic = ni->ni_ic;
295 struct ifnet *ifp = vap->iv_ifp;
296 struct ieee80211_frame *wh;
297 struct ieee80211_key *key;
298 struct ether_header *eh;
299 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
300 uint8_t dir, type, subtype, qos;
301 uint8_t *bssid;
302 uint16_t rxseq;
303
304 if (m->m_flags & M_AMPDU_MPDU) {
305 /*
306 * Fastpath for A-MPDU reorder q resubmission. Frames
307 * w/ M_AMPDU_MPDU marked have already passed through
308 * here but were received out of order and been held on
309 * the reorder queue. When resubmitted they are marked
310 * with the M_AMPDU_MPDU flag and we can bypass most of
311 * the normal processing.
312 */
313 wh = mtod(m, struct ieee80211_frame *);
314 type = IEEE80211_FC0_TYPE_DATA;
315 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
316 subtype = IEEE80211_FC0_SUBTYPE_QOS;
317 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
318 goto resubmit_ampdu;
319 }
320
321 KASSERT(ni != NULL, ("null node"));
322 ni->ni_inact = ni->ni_inact_reload;
323
324 type = -1; /* undefined */
325
326 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
327 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
328 ni->ni_macaddr, NULL,
329 "too short (1): len %u", m->m_pkthdr.len);
330 vap->iv_stats.is_rx_tooshort++;
331 goto out;
332 }
333 /*
334 * Bit of a cheat here, we use a pointer for a 3-address
335 * frame format but don't reference fields past outside
336 * ieee80211_frame_min w/o first validating the data is
337 * present.
338 */
339 wh = mtod(m, struct ieee80211_frame *);
340
341 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
342 IEEE80211_FC0_VERSION_0) {
343 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
344 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
345 wh->i_fc[0], wh->i_fc[1]);
346 vap->iv_stats.is_rx_badversion++;
347 goto err;
348 }
349
350 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
351 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
352 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
353 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
354 if (dir != IEEE80211_FC1_DIR_NODS)
355 bssid = wh->i_addr1;
356 else if (type == IEEE80211_FC0_TYPE_CTL)
357 bssid = wh->i_addr1;
358 else {
359 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
360 IEEE80211_DISCARD_MAC(vap,
361 IEEE80211_MSG_ANY, ni->ni_macaddr,
362 NULL, "too short (2): len %u",
363 m->m_pkthdr.len);
364 vap->iv_stats.is_rx_tooshort++;
365 goto out;
366 }
367 bssid = wh->i_addr3;
368 }
369 /*
370 * Validate the bssid.
371 */
372 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
373 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
374 /* not interested in */
375 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
376 bssid, NULL, "%s", "not to bss");
377 vap->iv_stats.is_rx_wrongbss++;
378 goto out;
379 }
380 /*
381 * Data frame, cons up a node when it doesn't
382 * exist. This should probably done after an ACL check.
383 */
384 if (type == IEEE80211_FC0_TYPE_DATA &&
385 ni == vap->iv_bss &&
386 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
387 /*
388 * Beware of frames that come in too early; we
389 * can receive broadcast frames and creating sta
390 * entries will blow up because there is no bss
391 * channel yet.
392 */
393 if (vap->iv_state != IEEE80211_S_RUN) {
394 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
395 wh, "data", "not in RUN state (%s)",
396 ieee80211_state_name[vap->iv_state]);
397 vap->iv_stats.is_rx_badstate++;
398 goto err;
399 }
400 /*
401 * Fake up a node for this newly
402 * discovered member of the IBSS.
403 */
404 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2);
405 if (ni == NULL) {
406 /* NB: stat kept for alloc failure */
407 goto err;
408 }
409 }
410 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
411 ni->ni_noise = nf;
412 if (HAS_SEQ(type)) {
413 uint8_t tid = ieee80211_gettid(wh);
414 if (IEEE80211_QOS_HAS_SEQ(wh) &&
415 TID_TO_WME_AC(tid) >= WME_AC_VI)
416 ic->ic_wme.wme_hipri_traffic++;
417 rxseq = le16toh(*(uint16_t *)wh->i_seq);
085ff963 418 if (! ieee80211_check_rxseq(ni, wh)) {
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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 */
085ff963 478 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
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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 *);
085ff963 496 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
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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)) {
1e290df3 628 if_printf(ifp, "received %s from %s rssi %d\n",
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629 ieee80211_mgt_subtype_name[subtype >>
630 IEEE80211_FC0_SUBTYPE_SHIFT],
085ff963 631 ether_sprintf(wh->i_addr2), rssi);
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632 }
633#endif
085ff963 634 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
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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 }
655err:
d40991ef 656 IFNET_STAT_INC(ifp, ierrors, 1);
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657out:
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;
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664}
665
666static int
667is11bclient(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
683static void
684adhoc_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;
085ff963 690 uint8_t *frm, *efrm, *sfrm;
32176cfd 691 uint8_t *ssid, *rates, *xrates;
085ff963
MD
692#if 0
693 int ht_state_change = 0;
694#endif
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695
696 wh = mtod(m0, struct ieee80211_frame *);
697 frm = (uint8_t *)&wh[1];
698 efrm = mtod(m0, uint8_t *) + m0->m_len;
699 switch (subtype) {
700 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
701 case IEEE80211_FC0_SUBTYPE_BEACON: {
702 struct ieee80211_scanparams scan;
703 /*
704 * We process beacon/probe response
705 * frames to discover neighbors.
706 */
707 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
708 return;
709 /*
710 * Count frame now that we know it's to be processed.
711 */
712 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
713 vap->iv_stats.is_rx_beacon++; /* XXX remove */
714 IEEE80211_NODE_STAT(ni, rx_beacons);
715 } else
716 IEEE80211_NODE_STAT(ni, rx_proberesp);
717 /*
718 * If scanning, just pass information to the scan module.
719 */
720 if (ic->ic_flags & IEEE80211_F_SCAN) {
721 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
722 /*
723 * Actively scanning a channel marked passive;
724 * send a probe request now that we know there
725 * is 802.11 traffic present.
726 *
727 * XXX check if the beacon we recv'd gives
728 * us what we need and suppress the probe req
729 */
730 ieee80211_probe_curchan(vap, 1);
731 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
732 }
733 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
734 return;
735 }
736 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
737 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
738 /*
739 * Create a new entry in the neighbor table.
740 */
741 ni = ieee80211_add_neighbor(vap, wh, &scan);
742 } else if (ni->ni_capinfo == 0) {
743 /*
744 * Update faked node created on transmit.
745 * Note this also updates the tsf.
746 */
747 ieee80211_init_neighbor(ni, wh, &scan);
748 } else {
749 /*
750 * Record tsf for potential resync.
751 */
752 memcpy(ni->ni_tstamp.data, scan.tstamp,
753 sizeof(ni->ni_tstamp));
754 }
085ff963
MD
755 /*
756 * This isn't enabled yet - otherwise it would
757 * update the HT parameters and channel width
758 * from any node, which could lead to lots of
759 * strange behaviour if the 11n nodes aren't
760 * exactly configured to match.
761 */
762#if 0
763 if (scan.htcap != NULL && scan.htinfo != NULL &&
764 (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
765 if (ieee80211_ht_updateparams(ni,
766 scan.htcap, scan.htinfo))
767 ht_state_change = 1;
768 }
769#endif
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770 if (ni != NULL) {
771 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
772 ni->ni_noise = nf;
773 }
085ff963
MD
774 /*
775 * Same here - the channel width change should
776 * be applied to the specific peer node, not
777 * to the ic. Ie, the interface configuration
778 * should stay in its current channel width;
779 * but it should change the rate control and
780 * any queued frames for the given node only.
781 *
782 * Since there's no (current) way to inform
783 * the driver that a channel width change has
784 * occured for a single node, just stub this
785 * out.
786 */
787#if 0
788 if (ht_state_change)
789 ieee80211_update_chw(ic);
790#endif
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791 }
792 break;
793 }
794
795 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
796 if (vap->iv_state != IEEE80211_S_RUN) {
797 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
798 wh, NULL, "wrong state %s",
799 ieee80211_state_name[vap->iv_state]);
800 vap->iv_stats.is_rx_mgtdiscard++;
801 return;
802 }
803 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
804 /* frame must be directed */
805 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
806 wh, NULL, "%s", "not unicast");
807 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */
808 return;
809 }
810
811 /*
812 * prreq frame format
813 * [tlv] ssid
814 * [tlv] supported rates
815 * [tlv] extended supported rates
816 */
817 ssid = rates = xrates = NULL;
085ff963 818 sfrm = frm;
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819 while (efrm - frm > 1) {
820 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
821 switch (*frm) {
822 case IEEE80211_ELEMID_SSID:
823 ssid = frm;
824 break;
825 case IEEE80211_ELEMID_RATES:
826 rates = frm;
827 break;
828 case IEEE80211_ELEMID_XRATES:
829 xrates = frm;
830 break;
831 }
832 frm += frm[1] + 2;
833 }
834 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
835 if (xrates != NULL)
836 IEEE80211_VERIFY_ELEMENT(xrates,
837 IEEE80211_RATE_MAXSIZE - rates[1], return);
838 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
839 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
840 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
841 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
842 wh, NULL,
843 "%s", "no ssid with ssid suppression enabled");
844 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
845 return;
846 }
847
848 /* XXX find a better class or define it's own */
849 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
850 "%s", "recv probe req");
851 /*
852 * Some legacy 11b clients cannot hack a complete
853 * probe response frame. When the request includes
854 * only a bare-bones rate set, communicate this to
855 * the transmit side.
856 */
857 ieee80211_send_proberesp(vap, wh->i_addr2,
858 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
859 break;
860
085ff963
MD
861 case IEEE80211_FC0_SUBTYPE_ACTION:
862 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
863 if (ni == vap->iv_bss) {
864 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
865 wh, NULL, "%s", "unknown node");
866 vap->iv_stats.is_rx_mgtdiscard++;
867 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
868 !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
869 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
870 wh, NULL, "%s", "not for us");
871 vap->iv_stats.is_rx_mgtdiscard++;
872 } else if (vap->iv_state != IEEE80211_S_RUN) {
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873 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
874 wh, NULL, "wrong state %s",
875 ieee80211_state_name[vap->iv_state]);
876 vap->iv_stats.is_rx_mgtdiscard++;
085ff963
MD
877 } else {
878 if (ieee80211_parse_action(ni, m0) == 0)
879 (void)ic->ic_recv_action(ni, wh, frm, efrm);
32176cfd 880 }
32176cfd 881 break;
32176cfd 882
32176cfd 883 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
32176cfd 884 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
085ff963 885 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
32176cfd 886 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
085ff963 887 case IEEE80211_FC0_SUBTYPE_ATIM:
32176cfd 888 case IEEE80211_FC0_SUBTYPE_DISASSOC:
085ff963
MD
889 case IEEE80211_FC0_SUBTYPE_AUTH:
890 case IEEE80211_FC0_SUBTYPE_DEAUTH:
32176cfd 891 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
085ff963 892 wh, NULL, "%s", "not handled");
32176cfd 893 vap->iv_stats.is_rx_mgtdiscard++;
085ff963 894 break;
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895
896 default:
897 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
085ff963 898 wh, "mgt", "subtype 0x%x not handled", subtype);
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899 vap->iv_stats.is_rx_badsubtype++;
900 break;
901 }
902}
903#undef IEEE80211_VERIFY_LENGTH
904#undef IEEE80211_VERIFY_ELEMENT
905
906static void
907ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
908 int subtype, int rssi, int nf)
909{
910 struct ieee80211vap *vap = ni->ni_vap;
911 struct ieee80211com *ic = ni->ni_ic;
085ff963 912 struct ieee80211_frame *wh;
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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);
085ff963
MD
920 else {
921 wh = mtod(m0, struct ieee80211_frame *);
922 switch (subtype) {
923 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
924 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
925 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
926 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
927 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
928 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
929 case IEEE80211_FC0_SUBTYPE_BEACON:
930 case IEEE80211_FC0_SUBTYPE_ATIM:
931 case IEEE80211_FC0_SUBTYPE_DISASSOC:
932 case IEEE80211_FC0_SUBTYPE_AUTH:
933 case IEEE80211_FC0_SUBTYPE_DEAUTH:
934 case IEEE80211_FC0_SUBTYPE_ACTION:
935 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
936 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
937 wh, NULL, "%s", "not handled");
938 vap->iv_stats.is_rx_mgtdiscard++;
939 break;
940 default:
941 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
942 wh, "mgt", "subtype 0x%x not handled", subtype);
943 vap->iv_stats.is_rx_badsubtype++;
944 break;
945 }
946 }
32176cfd
RP
947}
948
949static void
085ff963 950adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
32176cfd 951{
085ff963
MD
952
953 switch (subtype) {
954 case IEEE80211_FC0_SUBTYPE_BAR:
955 ieee80211_recv_bar(ni, m);
956 break;
957 }
32176cfd 958}