1 /*-
2 * Copyright (c) 2007-2008 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 WDS 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 <netproto/802_11/ieee80211_var.h>
59 #include <netproto/802_11/ieee80211_wds.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
65 static void wds_vattach(struct ieee80211vap *);
66 static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int);
67 static int wds_input(struct ieee80211_node *ni, struct mbuf *m,
68 const struct ieee80211_rx_stats *rxs, int, int);
69 static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, int subtype,
70 const struct ieee80211_rx_stats *, int, int);
71
72 void
ieee80211_wds_attach(struct ieee80211com * ic)73 ieee80211_wds_attach(struct ieee80211com *ic)
74 {
75 ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach;
76 }
77
78 void
ieee80211_wds_detach(struct ieee80211com * ic)79 ieee80211_wds_detach(struct ieee80211com *ic)
80 {
81 }
82
83 static void
wds_vdetach(struct ieee80211vap * vap)84 wds_vdetach(struct ieee80211vap *vap)
85 {
86 if (vap->iv_bss != NULL) {
87 /* XXX locking? */
88 if (vap->iv_bss->ni_wdsvap == vap)
89 vap->iv_bss->ni_wdsvap = NULL;
90 }
91 }
92
93 static void
wds_vattach(struct ieee80211vap * vap)94 wds_vattach(struct ieee80211vap *vap)
95 {
96 vap->iv_newstate = wds_newstate;
97 vap->iv_input = wds_input;
98 vap->iv_recv_mgmt = wds_recv_mgmt;
99 vap->iv_opdetach = wds_vdetach;
100 }
101
102 static void
wds_flush(struct ieee80211_node * ni)103 wds_flush(struct ieee80211_node *ni)
104 {
105 struct ieee80211com *ic = ni->ni_ic;
106 struct mbuf *m, *next;
107 int8_t rssi, nf;
108
109 m = ieee80211_ageq_remove(&ic->ic_stageq,
110 (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr));
111 if (m == NULL)
112 return;
113
114 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni,
115 "%s", "flush wds queue");
116 ic->ic_node_getsignal(ni, &rssi, &nf);
117 for (; m != NULL; m = next) {
118 next = m->m_nextpkt;
119 m->m_nextpkt = NULL;
120 ieee80211_input(ni, m, rssi, nf);
121 }
122 }
123
124 static int
ieee80211_create_wds(struct ieee80211vap * vap,struct ieee80211_channel * chan)125 ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan)
126 {
127 struct ieee80211com *ic = vap->iv_ic;
128 struct ieee80211_node_table *nt = &ic->ic_sta;
129 struct ieee80211_node *ni, *obss;
130
131 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
132 "%s: creating link to %s on channel %u\n", __func__,
133 ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan));
134
135 /* NB: vap create must specify the bssid for the link */
136 KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid"));
137 /* NB: we should only be called on RUN transition */
138 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state"));
139
140 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
141 /*
142 * Dynamic/non-legacy WDS. Reference the associated
143 * station specified by the desired bssid setup at vap
144 * create. Point ni_wdsvap at the WDS vap so 4-address
145 * frames received through the associated AP vap will
146 * be dispatched upward (e.g. to a bridge) as though
147 * they arrived on the WDS vap.
148 */
149 IEEE80211_NODE_LOCK(nt);
150 obss = NULL;
151 ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid);
152 if (ni == NULL) {
153 /*
154 * Node went away before we could hookup. This
155 * should be ok; no traffic will flow and a leave
156 * event will be dispatched that should cause
157 * the vap to be destroyed.
158 */
159 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
160 "%s: station %s went away\n",
161 __func__, ether_sprintf(vap->iv_des_bssid));
162 /* XXX stat? */
163 } else if (ni->ni_wdsvap != NULL) {
164 /*
165 * Node already setup with a WDS vap; we cannot
166 * allow multiple references so disallow. If
167 * ni_wdsvap points at us that's ok; we should
168 * do nothing anyway.
169 */
170 /* XXX printf instead? */
171 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
172 "%s: station %s in use with %s\n",
173 __func__, ether_sprintf(vap->iv_des_bssid),
174 ni->ni_wdsvap->iv_ifp->if_xname);
175 /* XXX stat? */
176 } else {
177 /*
178 * Committed to new node, setup state.
179 */
180 obss = vap->iv_bss;
181 vap->iv_bss = ni;
182 ni->ni_wdsvap = vap;
183 }
184 IEEE80211_NODE_UNLOCK(nt);
185 if (obss != NULL) {
186 /* NB: deferred to avoid recursive lock */
187 ieee80211_free_node(obss);
188 }
189 } else {
190 /*
191 * Legacy WDS vap setup.
192 */
193 /*
194 * The far end does not associate so we just create
195 * create a new node and install it as the vap's
196 * bss node. We must simulate an association and
197 * authorize the port for traffic to flow.
198 * XXX check if node already in sta table?
199 */
200 ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan);
201 if (ni != NULL) {
202 obss = vap->iv_bss;
203 vap->iv_bss = ieee80211_ref_node(ni);
204 ni->ni_flags |= IEEE80211_NODE_AREF;
205 if (obss != NULL)
206 ieee80211_free_node(obss);
207 /* give driver a chance to setup state like ni_txrate */
208 if (ic->ic_newassoc != NULL)
209 ic->ic_newassoc(ni, 1);
210 /* tell the authenticator about new station */
211 if (vap->iv_auth->ia_node_join != NULL)
212 vap->iv_auth->ia_node_join(ni);
213 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
214 ieee80211_node_authorize(ni);
215
216 ieee80211_notify_node_join(ni, 1 /*newassoc*/);
217 /* XXX inject l2uf frame */
218 }
219 }
220
221 /*
222 * Flush any pending frames now that were setup.
223 */
224 if (ni != NULL)
225 wds_flush(ni);
226 return (ni == NULL ? ENOENT : 0);
227 }
228
229 /*
230 * Propagate multicast frames of an ap vap to all DWDS links.
231 * The caller is assumed to have verified this frame is multicast.
232 */
233 void
ieee80211_dwds_mcast(struct ieee80211vap * vap0,struct mbuf * m)234 ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m)
235 {
236 struct ieee80211com *ic = vap0->iv_ic;
237 const struct ether_header *eh = mtod(m, const struct ether_header *);
238 struct ieee80211_node *ni;
239 struct ieee80211vap *vap;
240 struct ifnet *ifp;
241 struct mbuf *mcopy;
242 int err;
243
244 KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost),
245 ("%s not mcast", ether_sprintf(eh->ether_dhost)));
246
247 /* XXX locking */
248 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
249 /* only DWDS vaps are interesting */
250 if (vap->iv_opmode != IEEE80211_M_WDS ||
251 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))
252 continue;
253 /* if it came in this interface, don't send it back out */
254 ifp = vap->iv_ifp;
255 if (ifp == m->m_pkthdr.rcvif)
256 continue;
257 /*
258 * Duplicate the frame and send it.
259 */
260 mcopy = m_copypacket(m, M_NOWAIT);
261 if (mcopy == NULL) {
262 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
263 /* XXX stat + msg */
264 continue;
265 }
266 ni = ieee80211_find_txnode(vap, eh->ether_dhost);
267 if (ni == NULL) {
268 /* NB: ieee80211_find_txnode does stat+msg */
269 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
270 m_freem(mcopy);
271 continue;
272 }
273 /* calculate priority so drivers can find the tx queue */
274 if (ieee80211_classify(ni, mcopy)) {
275 IEEE80211_DISCARD_MAC(vap,
276 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS,
277 eh->ether_dhost, NULL,
278 "%s", "classification failure");
279 vap->iv_stats.is_tx_classify++;
280 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
281 m_freem(mcopy);
282 ieee80211_free_node(ni);
283 continue;
284 }
285
286 BPF_MTAP(ifp, m); /* 802.3 tx */
287
288 /*
289 * Encapsulate the packet in prep for transmission.
290 */
291 IEEE80211_TX_LOCK(ic);
292 mcopy = ieee80211_encap(vap, ni, mcopy);
293 if (mcopy == NULL) {
294 /* NB: stat+msg handled in ieee80211_encap */
295 IEEE80211_TX_UNLOCK(ic);
296 ieee80211_free_node(ni);
297 continue;
298 }
299 mcopy->m_flags |= M_MCAST;
300 mcopy->m_pkthdr.rcvif = (void *) ni;
301
302 err = ieee80211_parent_xmitpkt(ic, mcopy);
303 IEEE80211_TX_UNLOCK(ic);
304 if (!err) {
305 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
306 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
307 if_inc_counter(ifp, IFCOUNTER_OBYTES,
308 m->m_pkthdr.len);
309 }
310 }
311 }
312
313 /*
314 * Handle DWDS discovery on receipt of a 4-address frame in
315 * ap mode. Queue the frame and post an event for someone
316 * to plumb the necessary WDS vap for this station. Frames
317 * received prior to the vap set running will then be reprocessed
318 * as if they were just received.
319 */
320 void
ieee80211_dwds_discover(struct ieee80211_node * ni,struct mbuf * m)321 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m)
322 {
323 struct ieee80211com *ic = ni->ni_ic;
324
325 /*
326 * Save the frame with an aging interval 4 times
327 * the listen interval specified by the station.
328 * Frames that sit around too long are reclaimed
329 * using this information.
330 * XXX handle overflow?
331 * XXX per/vap beacon interval?
332 */
333 m->m_pkthdr.rcvif = (void *)(uintptr_t)
334 ieee80211_mac_hash(ic, ni->ni_macaddr);
335 (void) ieee80211_ageq_append(&ic->ic_stageq, m,
336 ((ni->ni_intval * ic->ic_lintval) << 2) / 1024);
337 ieee80211_notify_wds_discover(ni);
338 }
339
340 /*
341 * IEEE80211_M_WDS vap state machine handler.
342 */
343 static int
wds_newstate(struct ieee80211vap * vap,enum ieee80211_state nstate,int arg)344 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
345 {
346 struct ieee80211com *ic = vap->iv_ic;
347 struct ieee80211_node *ni;
348 enum ieee80211_state ostate;
349 int error;
350
351 IEEE80211_LOCK_ASSERT(ic);
352
353 ostate = vap->iv_state;
354 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__,
355 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
356 vap->iv_state = nstate; /* state transition */
357 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */
358 if (ostate != IEEE80211_S_SCAN)
359 ieee80211_cancel_scan(vap); /* background scan */
360 ni = vap->iv_bss; /* NB: no reference held */
361 error = 0;
362 switch (nstate) {
363 case IEEE80211_S_INIT:
364 switch (ostate) {
365 case IEEE80211_S_SCAN:
366 ieee80211_cancel_scan(vap);
367 break;
368 default:
369 break;
370 }
371 if (ostate != IEEE80211_S_INIT) {
372 /* NB: optimize INIT -> INIT case */
373 ieee80211_reset_bss(vap);
374 }
375 break;
376 case IEEE80211_S_SCAN:
377 switch (ostate) {
378 case IEEE80211_S_INIT:
379 ieee80211_check_scan_current(vap);
380 break;
381 default:
382 break;
383 }
384 break;
385 case IEEE80211_S_RUN:
386 if (ostate == IEEE80211_S_INIT) {
387 /*
388 * Already have a channel; bypass the scan
389 * and startup immediately.
390 */
391 error = ieee80211_create_wds(vap, ic->ic_curchan);
392 }
393 break;
394 default:
395 break;
396 }
397 return error;
398 }
399
400 /*
401 * Process a received frame. The node associated with the sender
402 * should be supplied. If nothing was found in the node table then
403 * the caller is assumed to supply a reference to iv_bss instead.
404 * The RSSI and a timestamp are also supplied. The RSSI data is used
405 * during AP scanning to select a AP to associate with; it can have
406 * any units so long as values have consistent units and higher values
407 * mean ``better signal''. The receive timestamp is currently not used
408 * by the 802.11 layer.
409 */
410 static int
wds_input(struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_rx_stats * rxs,int rssi,int nf)411 wds_input(struct ieee80211_node *ni, struct mbuf *m,
412 const struct ieee80211_rx_stats *rxs, int rssi, int nf)
413 {
414 struct ieee80211vap *vap = ni->ni_vap;
415 struct ieee80211com *ic = ni->ni_ic;
416 struct ifnet *ifp = vap->iv_ifp;
417 struct ieee80211_frame *wh;
418 struct ieee80211_key *key;
419 struct ether_header *eh;
420 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
421 uint8_t dir, type, subtype, qos;
422
423 if (m->m_flags & M_AMPDU_MPDU) {
424 /*
425 * Fastpath for A-MPDU reorder q resubmission. Frames
426 * w/ M_AMPDU_MPDU marked have already passed through
427 * here but were received out of order and been held on
428 * the reorder queue. When resubmitted they are marked
429 * with the M_AMPDU_MPDU flag and we can bypass most of
430 * the normal processing.
431 */
432 wh = mtod(m, struct ieee80211_frame *);
433 type = IEEE80211_FC0_TYPE_DATA;
434 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
435 subtype = IEEE80211_FC0_SUBTYPE_QOS;
436 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
437 goto resubmit_ampdu;
438 }
439
440 KASSERT(ni != NULL, ("null node"));
441
442 type = -1; /* undefined */
443
444 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
445 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
446 ni->ni_macaddr, NULL,
447 "too short (1): len %u", m->m_pkthdr.len);
448 vap->iv_stats.is_rx_tooshort++;
449 goto out;
450 }
451 /*
452 * Bit of a cheat here, we use a pointer for a 3-address
453 * frame format but don't reference fields past outside
454 * ieee80211_frame_min w/o first validating the data is
455 * present.
456 */
457 wh = mtod(m, struct ieee80211_frame *);
458
459 if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
460 ni->ni_inact = ni->ni_inact_reload;
461
462 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
463 IEEE80211_FC0_VERSION_0) {
464 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
465 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
466 wh->i_fc[0], wh->i_fc[1]);
467 vap->iv_stats.is_rx_badversion++;
468 goto err;
469 }
470
471 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
472 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
473 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
474
475 /* NB: WDS vap's do not scan */
476 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) {
477 IEEE80211_DISCARD_MAC(vap,
478 IEEE80211_MSG_ANY, ni->ni_macaddr, NULL,
479 "too short (3): len %u", m->m_pkthdr.len);
480 vap->iv_stats.is_rx_tooshort++;
481 goto out;
482 }
483 /* NB: the TA is implicitly verified by finding the wds peer node */
484 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) &&
485 !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) {
486 /* not interested in */
487 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
488 wh->i_addr1, NULL, "%s", "not to bss");
489 vap->iv_stats.is_rx_wrongbss++;
490 goto out;
491 }
492 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
493 ni->ni_noise = nf;
494 if (IEEE80211_HAS_SEQ(type, subtype)) {
495 uint8_t tid = ieee80211_gettid(wh);
496 if (IEEE80211_QOS_HAS_SEQ(wh) &&
497 TID_TO_WME_AC(tid) >= WME_AC_VI)
498 ic->ic_wme.wme_hipri_traffic++;
499 if (! ieee80211_check_rxseq(ni, wh, wh->i_addr1))
500 goto out;
501 }
502 switch (type) {
503 case IEEE80211_FC0_TYPE_DATA:
504 hdrspace = ieee80211_hdrspace(ic, wh);
505 if (m->m_len < hdrspace &&
506 (m = m_pullup(m, hdrspace)) == NULL) {
507 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
508 ni->ni_macaddr, NULL,
509 "data too short: expecting %u", hdrspace);
510 vap->iv_stats.is_rx_tooshort++;
511 goto out; /* XXX */
512 }
513 if (dir != IEEE80211_FC1_DIR_DSTODS) {
514 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
515 wh, "data", "incorrect dir 0x%x", dir);
516 vap->iv_stats.is_rx_wrongdir++;
517 goto out;
518 }
519 /*
520 * Only legacy WDS traffic should take this path.
521 */
522 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
523 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
524 wh, "data", "%s", "not legacy wds");
525 vap->iv_stats.is_rx_wrongdir++;/*XXX*/
526 goto out;
527 }
528 /*
529 * Handle A-MPDU re-ordering. If the frame is to be
530 * processed directly then ieee80211_ampdu_reorder
531 * will return 0; otherwise it has consumed the mbuf
532 * and we should do nothing more with it.
533 */
534 if ((m->m_flags & M_AMPDU) &&
535 ieee80211_ampdu_reorder(ni, m) != 0) {
536 m = NULL;
537 goto out;
538 }
539 resubmit_ampdu:
540
541 /*
542 * Handle privacy requirements. Note that we
543 * must not be preempted from here until after
544 * we (potentially) call ieee80211_crypto_demic;
545 * otherwise we may violate assumptions in the
546 * crypto cipher modules used to do delayed update
547 * of replay sequence numbers.
548 */
549 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
550 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
551 /*
552 * Discard encrypted frames when privacy is off.
553 */
554 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
555 wh, "WEP", "%s", "PRIVACY off");
556 vap->iv_stats.is_rx_noprivacy++;
557 IEEE80211_NODE_STAT(ni, rx_noprivacy);
558 goto out;
559 }
560 key = ieee80211_crypto_decap(ni, m, hdrspace);
561 if (key == NULL) {
562 /* NB: stats+msgs handled in crypto_decap */
563 IEEE80211_NODE_STAT(ni, rx_wepfail);
564 goto out;
565 }
566 wh = mtod(m, struct ieee80211_frame *);
567 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
568 } else {
569 /* XXX M_WEP and IEEE80211_F_PRIVACY */
570 key = NULL;
571 }
572
573 /*
574 * Save QoS bits for use below--before we strip the header.
575 */
576 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
577 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
578 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
579 ((struct ieee80211_qosframe *)wh)->i_qos[0];
580 } else
581 qos = 0;
582
583 /*
584 * Next up, any fragmentation.
585 */
586 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
587 m = ieee80211_defrag(ni, m, hdrspace);
588 if (m == NULL) {
589 /* Fragment dropped or frame not complete yet */
590 goto out;
591 }
592 }
593 wh = NULL; /* no longer valid, catch any uses */
594
595 /*
596 * Next strip any MSDU crypto bits.
597 */
598 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
599 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
600 ni->ni_macaddr, "data", "%s", "demic error");
601 vap->iv_stats.is_rx_demicfail++;
602 IEEE80211_NODE_STAT(ni, rx_demicfail);
603 goto out;
604 }
605
606 /* copy to listener after decrypt */
607 if (ieee80211_radiotap_active_vap(vap))
608 ieee80211_radiotap_rx(vap, m);
609 need_tap = 0;
610
611 /*
612 * Finally, strip the 802.11 header.
613 */
614 m = ieee80211_decap(vap, m, hdrspace);
615 if (m == NULL) {
616 /* XXX mask bit to check for both */
617 /* don't count Null data frames as errors */
618 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
619 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
620 goto out;
621 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
622 ni->ni_macaddr, "data", "%s", "decap error");
623 vap->iv_stats.is_rx_decap++;
624 IEEE80211_NODE_STAT(ni, rx_decap);
625 goto err;
626 }
627 eh = mtod(m, struct ether_header *);
628 if (!ieee80211_node_is_authorized(ni)) {
629 /*
630 * Deny any non-PAE frames received prior to
631 * authorization. For open/shared-key
632 * authentication the port is mark authorized
633 * after authentication completes. For 802.1x
634 * the port is not marked authorized by the
635 * authenticator until the handshake has completed.
636 */
637 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
638 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
639 eh->ether_shost, "data",
640 "unauthorized port: ether type 0x%x len %u",
641 eh->ether_type, m->m_pkthdr.len);
642 vap->iv_stats.is_rx_unauth++;
643 IEEE80211_NODE_STAT(ni, rx_unauth);
644 goto err;
645 }
646 } else {
647 /*
648 * When denying unencrypted frames, discard
649 * any non-PAE frames received without encryption.
650 */
651 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
652 (key == NULL && (m->m_flags & M_WEP) == 0) &&
653 eh->ether_type != htons(ETHERTYPE_PAE)) {
654 /*
655 * Drop unencrypted frames.
656 */
657 vap->iv_stats.is_rx_unencrypted++;
658 IEEE80211_NODE_STAT(ni, rx_unencrypted);
659 goto out;
660 }
661 }
662 /* XXX require HT? */
663 if (qos & IEEE80211_QOS_AMSDU) {
664 m = ieee80211_decap_amsdu(ni, m);
665 if (m == NULL)
666 return IEEE80211_FC0_TYPE_DATA;
667 } else {
668 #ifdef IEEE80211_SUPPORT_SUPERG
669 m = ieee80211_decap_fastframe(vap, ni, m);
670 if (m == NULL)
671 return IEEE80211_FC0_TYPE_DATA;
672 #endif
673 }
674 ieee80211_deliver_data(vap, ni, m);
675 return IEEE80211_FC0_TYPE_DATA;
676
677 case IEEE80211_FC0_TYPE_MGT:
678 vap->iv_stats.is_rx_mgmt++;
679 IEEE80211_NODE_STAT(ni, rx_mgmt);
680 if (dir != IEEE80211_FC1_DIR_NODS) {
681 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
682 wh, "data", "incorrect dir 0x%x", dir);
683 vap->iv_stats.is_rx_wrongdir++;
684 goto err;
685 }
686 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
687 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
688 ni->ni_macaddr, "mgt", "too short: len %u",
689 m->m_pkthdr.len);
690 vap->iv_stats.is_rx_tooshort++;
691 goto out;
692 }
693 #ifdef IEEE80211_DEBUG
694 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) {
695 if_printf(ifp, "received %s from %s rssi %d\n",
696 ieee80211_mgt_subtype_name(subtype),
697 ether_sprintf(wh->i_addr2), rssi);
698 }
699 #endif
700 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
701 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
702 wh, NULL, "%s", "WEP set but not permitted");
703 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
704 goto out;
705 }
706 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
707 goto out;
708
709 case IEEE80211_FC0_TYPE_CTL:
710 vap->iv_stats.is_rx_ctl++;
711 IEEE80211_NODE_STAT(ni, rx_ctrl);
712 goto out;
713
714 default:
715 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
716 wh, "bad", "frame type 0x%x", type);
717 /* should not come here */
718 break;
719 }
720 err:
721 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
722 out:
723 if (m != NULL) {
724 if (need_tap && ieee80211_radiotap_active_vap(vap))
725 ieee80211_radiotap_rx(vap, m);
726 m_freem(m);
727 }
728 return type;
729 }
730
731 static void
wds_recv_mgmt(struct ieee80211_node * ni,struct mbuf * m0,int subtype,const struct ieee80211_rx_stats * rxs,int rssi,int nf)732 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
733 const struct ieee80211_rx_stats *rxs, int rssi, int nf)
734 {
735 struct ieee80211vap *vap = ni->ni_vap;
736 struct ieee80211com *ic = ni->ni_ic;
737 struct ieee80211_frame *wh;
738 u_int8_t *frm, *efrm;
739
740 wh = mtod(m0, struct ieee80211_frame *);
741 frm = (u_int8_t *)&wh[1];
742 efrm = mtod(m0, u_int8_t *) + m0->m_len;
743 switch (subtype) {
744 case IEEE80211_FC0_SUBTYPE_ACTION:
745 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
746 if (ni == vap->iv_bss) {
747 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
748 wh, NULL, "%s", "unknown node");
749 vap->iv_stats.is_rx_mgtdiscard++;
750 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) {
751 /* NB: not interested in multicast frames. */
752 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
753 wh, NULL, "%s", "not for us");
754 vap->iv_stats.is_rx_mgtdiscard++;
755 } else if (vap->iv_state != IEEE80211_S_RUN) {
756 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
757 wh, NULL, "wrong state %s",
758 ieee80211_state_name[vap->iv_state]);
759 vap->iv_stats.is_rx_mgtdiscard++;
760 } else {
761 if (ieee80211_parse_action(ni, m0) == 0)
762 (void)ic->ic_recv_action(ni, wh, frm, efrm);
763 }
764 break;
765
766 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
767 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
768 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
769 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
770 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
771 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
772 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
773 case IEEE80211_FC0_SUBTYPE_BEACON:
774 case IEEE80211_FC0_SUBTYPE_ATIM:
775 case IEEE80211_FC0_SUBTYPE_DISASSOC:
776 case IEEE80211_FC0_SUBTYPE_AUTH:
777 case IEEE80211_FC0_SUBTYPE_DEAUTH:
778 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
779 wh, NULL, "%s", "not handled");
780 vap->iv_stats.is_rx_mgtdiscard++;
781 break;
782
783 default:
784 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
785 wh, "mgt", "subtype 0x%x not handled", subtype);
786 vap->iv_stats.is_rx_badsubtype++;
787 break;
788 }
789 }
790