1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 /*
29 * IEEE 802.11 WDS mode support.
30 */
31 #include "opt_inet.h"
32 #include "opt_wlan.h"
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/mbuf.h>
37 #include <sys/malloc.h>
38 #include <sys/kernel.h>
39
40 #include <sys/socket.h>
41 #include <sys/sockio.h>
42 #include <sys/endian.h>
43 #include <sys/errno.h>
44 #include <sys/proc.h>
45 #include <sys/sysctl.h>
46
47 #include <net/if.h>
48 #include <net/if_var.h>
49 #include <net/if_media.h>
50 #include <net/if_llc.h>
51 #include <net/ethernet.h>
52
53 #include <net/bpf.h>
54
55 #include <net80211/ieee80211_var.h>
56 #include <net80211/ieee80211_wds.h>
57 #include <net80211/ieee80211_input.h>
58 #ifdef IEEE80211_SUPPORT_SUPERG
59 #include <net80211/ieee80211_superg.h>
60 #endif
61
62 static void wds_vattach(struct ieee80211vap *);
63 static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int);
64 static int wds_input(struct ieee80211_node *ni, struct mbuf *m,
65 const struct ieee80211_rx_stats *rxs, int, int);
66 static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, int subtype,
67 const struct ieee80211_rx_stats *, int, int);
68
69 void
ieee80211_wds_attach(struct ieee80211com * ic)70 ieee80211_wds_attach(struct ieee80211com *ic)
71 {
72 ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach;
73 }
74
75 void
ieee80211_wds_detach(struct ieee80211com * ic)76 ieee80211_wds_detach(struct ieee80211com *ic)
77 {
78 }
79
80 static void
wds_vdetach(struct ieee80211vap * vap)81 wds_vdetach(struct ieee80211vap *vap)
82 {
83 if (vap->iv_bss != NULL) {
84 /* XXX locking? */
85 if (vap->iv_bss->ni_wdsvap == vap)
86 vap->iv_bss->ni_wdsvap = NULL;
87 }
88 }
89
90 static void
wds_vattach(struct ieee80211vap * vap)91 wds_vattach(struct ieee80211vap *vap)
92 {
93 vap->iv_newstate = wds_newstate;
94 vap->iv_input = wds_input;
95 vap->iv_recv_mgmt = wds_recv_mgmt;
96 vap->iv_opdetach = wds_vdetach;
97 }
98
99 static void
wds_flush(struct ieee80211_node * ni)100 wds_flush(struct ieee80211_node *ni)
101 {
102 struct ieee80211com *ic = ni->ni_ic;
103 struct mbuf *m, *next;
104 int8_t rssi, nf;
105
106 m = ieee80211_ageq_remove(&ic->ic_stageq,
107 (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr));
108 if (m == NULL)
109 return;
110
111 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni,
112 "%s", "flush wds queue");
113 ic->ic_node_getsignal(ni, &rssi, &nf);
114 for (; m != NULL; m = next) {
115 next = m->m_nextpkt;
116 m->m_nextpkt = NULL;
117 ieee80211_input(ni, m, rssi, nf);
118 }
119 }
120
121 static int
ieee80211_create_wds(struct ieee80211vap * vap,struct ieee80211_channel * chan)122 ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan)
123 {
124 struct ieee80211com *ic = vap->iv_ic;
125 struct ieee80211_node_table *nt = &ic->ic_sta;
126 struct ieee80211_node *ni, *obss;
127
128 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
129 "%s: creating link to %s on channel %u\n", __func__,
130 ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan));
131
132 /* NB: vap create must specify the bssid for the link */
133 KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid"));
134 /* NB: we should only be called on RUN transition */
135 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state"));
136
137 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
138 /*
139 * Dynamic/non-legacy WDS. Reference the associated
140 * station specified by the desired bssid setup at vap
141 * create. Point ni_wdsvap at the WDS vap so 4-address
142 * frames received through the associated AP vap will
143 * be dispatched upward (e.g. to a bridge) as though
144 * they arrived on the WDS vap.
145 */
146 IEEE80211_NODE_LOCK(nt);
147 obss = NULL;
148 ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid);
149 if (ni == NULL) {
150 /*
151 * Node went away before we could hookup. This
152 * should be ok; no traffic will flow and a leave
153 * event will be dispatched that should cause
154 * the vap to be destroyed.
155 */
156 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
157 "%s: station %s went away\n",
158 __func__, ether_sprintf(vap->iv_des_bssid));
159 /* XXX stat? */
160 } else if (ni->ni_wdsvap != NULL) {
161 /*
162 * Node already setup with a WDS vap; we cannot
163 * allow multiple references so disallow. If
164 * ni_wdsvap points at us that's ok; we should
165 * do nothing anyway.
166 */
167 /* XXX printf instead? */
168 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
169 "%s: station %s in use with %s\n",
170 __func__, ether_sprintf(vap->iv_des_bssid),
171 ieee80211_get_vap_ifname(ni->ni_wdsvap));
172 /* XXX stat? */
173 } else {
174 /*
175 * Committed to new node, setup state.
176 */
177 obss = vap->iv_update_bss(vap, ni);
178 ni->ni_wdsvap = vap;
179 }
180 IEEE80211_NODE_UNLOCK(nt);
181 if (obss != NULL) {
182 /* NB: deferred to avoid recursive lock */
183 ieee80211_free_node(obss);
184 }
185 } else {
186 /*
187 * Legacy WDS vap setup.
188 */
189 /*
190 * The far end does not associate so we just create
191 * create a new node and install it as the vap's
192 * bss node. We must simulate an association and
193 * authorize the port for traffic to flow.
194 * XXX check if node already in sta table?
195 */
196 ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan);
197 if (ni != NULL) {
198 obss = vap->iv_update_bss(vap, ieee80211_ref_node(ni));
199 ni->ni_flags |= IEEE80211_NODE_AREF;
200 if (obss != NULL)
201 ieee80211_free_node(obss);
202 /* give driver a chance to setup state like ni_txrate */
203 if (ic->ic_newassoc != NULL)
204 ic->ic_newassoc(ni, 1);
205 /* tell the authenticator about new station */
206 if (vap->iv_auth->ia_node_join != NULL)
207 vap->iv_auth->ia_node_join(ni);
208 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
209 ieee80211_node_authorize(ni);
210
211 ieee80211_notify_node_join(ni, 1 /*newassoc*/);
212 /* XXX inject l2uf frame */
213 }
214 }
215
216 /*
217 * Flush any pending frames now that were setup.
218 */
219 if (ni != NULL)
220 wds_flush(ni);
221 return (ni == NULL ? ENOENT : 0);
222 }
223
224 /*
225 * Propagate multicast frames of an ap vap to all DWDS links.
226 * The caller is assumed to have verified this frame is multicast.
227 */
228 void
ieee80211_dwds_mcast(struct ieee80211vap * vap0,struct mbuf * m)229 ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m)
230 {
231 struct ieee80211com *ic = vap0->iv_ic;
232 const struct ether_header *eh = mtod(m, const struct ether_header *);
233 struct ieee80211_node *ni;
234 struct ieee80211vap *vap;
235 struct ifnet *ifp;
236 struct mbuf *mcopy;
237 int err;
238
239 KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost),
240 ("%s not mcast", ether_sprintf(eh->ether_dhost)));
241
242 /* XXX locking */
243 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
244 /* only DWDS vaps are interesting */
245 if (vap->iv_opmode != IEEE80211_M_WDS ||
246 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))
247 continue;
248 /* if it came in this interface, don't send it back out */
249 ifp = vap->iv_ifp;
250 if (ifp == m->m_pkthdr.rcvif)
251 continue;
252 /*
253 * Duplicate the frame and send it.
254 */
255 mcopy = m_copypacket(m, IEEE80211_M_NOWAIT);
256 if (mcopy == NULL) {
257 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
258 /* XXX stat + msg */
259 continue;
260 }
261 ni = ieee80211_find_txnode(vap, eh->ether_dhost);
262 if (ni == NULL) {
263 /* NB: ieee80211_find_txnode does stat+msg */
264 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
265 m_freem(mcopy);
266 continue;
267 }
268 /* calculate priority so drivers can find the tx queue */
269 if (ieee80211_classify(ni, mcopy)) {
270 IEEE80211_DISCARD_MAC(vap,
271 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS,
272 eh->ether_dhost, NULL,
273 "%s", "classification failure");
274 vap->iv_stats.is_tx_classify++;
275 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
276 m_freem(mcopy);
277 ieee80211_free_node(ni);
278 continue;
279 }
280
281 BPF_MTAP(ifp, m); /* 802.3 tx */
282
283 /*
284 * Encapsulate the packet in prep for transmission.
285 */
286 IEEE80211_TX_LOCK(ic);
287 mcopy = ieee80211_encap(vap, ni, mcopy);
288 if (mcopy == NULL) {
289 /* NB: stat+msg handled in ieee80211_encap */
290 IEEE80211_TX_UNLOCK(ic);
291 ieee80211_free_node(ni);
292 continue;
293 }
294 mcopy->m_flags |= M_MCAST;
295 MPASS((mcopy->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
296 mcopy->m_pkthdr.rcvif = (void *) ni;
297
298 err = ieee80211_parent_xmitpkt(ic, mcopy);
299 IEEE80211_TX_UNLOCK(ic);
300 if (!err) {
301 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
302 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
303 if_inc_counter(ifp, IFCOUNTER_OBYTES,
304 m->m_pkthdr.len);
305 }
306 }
307 }
308
309 /*
310 * Handle DWDS discovery on receipt of a 4-address frame in
311 * ap mode. Queue the frame and post an event for someone
312 * to plumb the necessary WDS vap for this station. Frames
313 * received prior to the vap set running will then be reprocessed
314 * as if they were just received.
315 */
316 void
ieee80211_dwds_discover(struct ieee80211_node * ni,struct mbuf * m)317 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m)
318 {
319 struct ieee80211com *ic = ni->ni_ic;
320
321 /*
322 * Save the frame with an aging interval 4 times
323 * the listen interval specified by the station.
324 * Frames that sit around too long are reclaimed
325 * using this information.
326 * XXX handle overflow?
327 * XXX per/vap beacon interval?
328 */
329 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
330 m->m_pkthdr.rcvif = (void *)(uintptr_t)
331 ieee80211_mac_hash(ic, ni->ni_macaddr);
332 (void) ieee80211_ageq_append(&ic->ic_stageq, m,
333 ((ni->ni_intval * ic->ic_lintval) << 2) / 1024);
334 ieee80211_notify_wds_discover(ni);
335 }
336
337 /*
338 * IEEE80211_M_WDS vap state machine handler.
339 */
340 static int
wds_newstate(struct ieee80211vap * vap,enum ieee80211_state nstate,int arg)341 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
342 {
343 struct ieee80211com *ic = vap->iv_ic;
344 enum ieee80211_state ostate;
345 int error;
346
347 IEEE80211_LOCK_ASSERT(ic);
348
349 ostate = vap->iv_state;
350 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__,
351 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
352 vap->iv_state = nstate; /* state transition */
353 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */
354 if (ostate != IEEE80211_S_SCAN)
355 ieee80211_cancel_scan(vap); /* background scan */
356 error = 0;
357 switch (nstate) {
358 case IEEE80211_S_INIT:
359 switch (ostate) {
360 case IEEE80211_S_SCAN:
361 ieee80211_cancel_scan(vap);
362 break;
363 default:
364 break;
365 }
366 if (ostate != IEEE80211_S_INIT) {
367 /* NB: optimize INIT -> INIT case */
368 ieee80211_reset_bss(vap);
369 }
370 break;
371 case IEEE80211_S_SCAN:
372 switch (ostate) {
373 case IEEE80211_S_INIT:
374 ieee80211_check_scan_current(vap);
375 break;
376 default:
377 break;
378 }
379 break;
380 case IEEE80211_S_RUN:
381 if (ostate == IEEE80211_S_INIT) {
382 /*
383 * Already have a channel; bypass the scan
384 * and startup immediately.
385 */
386 error = ieee80211_create_wds(vap, ic->ic_curchan);
387 }
388 break;
389 default:
390 break;
391 }
392 return error;
393 }
394
395 /*
396 * Process a received frame. The node associated with the sender
397 * should be supplied. If nothing was found in the node table then
398 * the caller is assumed to supply a reference to iv_bss instead.
399 * The RSSI and a timestamp are also supplied. The RSSI data is used
400 * during AP scanning to select a AP to associate with; it can have
401 * any units so long as values have consistent units and higher values
402 * mean ``better signal''. The receive timestamp is currently not used
403 * by the 802.11 layer.
404 */
405 static int
wds_input(struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_rx_stats * rxs,int rssi,int nf)406 wds_input(struct ieee80211_node *ni, struct mbuf *m,
407 const struct ieee80211_rx_stats *rxs, int rssi, int nf)
408 {
409 struct ieee80211vap *vap = ni->ni_vap;
410 struct ieee80211com *ic = ni->ni_ic;
411 struct ifnet *ifp = vap->iv_ifp;
412 struct ieee80211_frame *wh;
413 struct ieee80211_key *key;
414 struct ether_header *eh;
415 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
416 uint8_t dir, type, subtype, qos;
417 int is_hw_decrypted = 0;
418 int has_decrypted = 0;
419
420 /*
421 * Some devices do hardware decryption all the way through
422 * to pretending the frame wasn't encrypted in the first place.
423 * So, tag it appropriately so it isn't discarded inappropriately.
424 */
425 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED))
426 is_hw_decrypted = 1;
427
428 if (m->m_flags & M_AMPDU_MPDU) {
429 /*
430 * Fastpath for A-MPDU reorder q resubmission. Frames
431 * w/ M_AMPDU_MPDU marked have already passed through
432 * here but were received out of order and been held on
433 * the reorder queue. When resubmitted they are marked
434 * with the M_AMPDU_MPDU flag and we can bypass most of
435 * the normal processing.
436 */
437 wh = mtod(m, struct ieee80211_frame *);
438 type = IEEE80211_FC0_TYPE_DATA;
439 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
440 subtype = IEEE80211_FC0_SUBTYPE_QOS_DATA;
441 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
442 goto resubmit_ampdu;
443 }
444
445 KASSERT(ni != NULL, ("null node"));
446
447 type = -1; /* undefined */
448
449 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
450 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
451 ni->ni_macaddr, NULL,
452 "too short (1): len %u", m->m_pkthdr.len);
453 vap->iv_stats.is_rx_tooshort++;
454 goto out;
455 }
456 /*
457 * Bit of a cheat here, we use a pointer for a 3-address
458 * frame format but don't reference fields past outside
459 * ieee80211_frame_min w/o first validating the data is
460 * present.
461 */
462 wh = mtod(m, struct ieee80211_frame *);
463
464 if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
465 ni->ni_inact = ni->ni_inact_reload;
466
467 if (!IEEE80211_IS_FC0_CHECK_VER(wh, IEEE80211_FC0_VERSION_0)) {
468 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
469 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
470 wh->i_fc[0], wh->i_fc[1]);
471 vap->iv_stats.is_rx_badversion++;
472 goto err;
473 }
474
475 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
476 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
477 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
478
479 /* NB: WDS vap's do not scan */
480 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) {
481 IEEE80211_DISCARD_MAC(vap,
482 IEEE80211_MSG_ANY, ni->ni_macaddr, NULL,
483 "too short (3): len %u", m->m_pkthdr.len);
484 vap->iv_stats.is_rx_tooshort++;
485 goto out;
486 }
487 /* NB: the TA is implicitly verified by finding the wds peer node */
488 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) &&
489 !IEEE80211_ADDR_EQ(wh->i_addr1,
490 ieee80211_vap_get_broadcast_address(vap))) {
491 /* not interested in */
492 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
493 wh->i_addr1, NULL, "%s", "not to bss");
494 vap->iv_stats.is_rx_wrongbss++;
495 goto out;
496 }
497 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
498 ni->ni_noise = nf;
499 if (IEEE80211_HAS_SEQ(type, subtype)) {
500 uint8_t tid = ieee80211_gettid(wh);
501 if (IEEE80211_QOS_HAS_SEQ(wh) &&
502 TID_TO_WME_AC(tid) >= WME_AC_VI)
503 ic->ic_wme.wme_hipri_traffic++;
504 if (! ieee80211_check_rxseq(ni, wh, wh->i_addr1, rxs))
505 goto out;
506 }
507 switch (type) {
508 case IEEE80211_FC0_TYPE_DATA:
509 hdrspace = ieee80211_hdrspace(ic, wh);
510 if (m->m_len < hdrspace &&
511 (m = m_pullup(m, hdrspace)) == NULL) {
512 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
513 ni->ni_macaddr, NULL,
514 "data too short: expecting %u", hdrspace);
515 vap->iv_stats.is_rx_tooshort++;
516 goto out; /* XXX */
517 }
518 if (dir != IEEE80211_FC1_DIR_DSTODS) {
519 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
520 wh, "data", "incorrect dir 0x%x", dir);
521 vap->iv_stats.is_rx_wrongdir++;
522 goto out;
523 }
524 /*
525 * Only legacy WDS traffic should take this path.
526 */
527 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
528 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
529 wh, "data", "%s", "not legacy wds");
530 vap->iv_stats.is_rx_wrongdir++;/*XXX*/
531 goto out;
532 }
533 /*
534 * Handle A-MPDU re-ordering. If the frame is to be
535 * processed directly then ieee80211_ampdu_reorder
536 * will return 0; otherwise it has consumed the mbuf
537 * and we should do nothing more with it.
538 */
539 if ((m->m_flags & M_AMPDU) &&
540 ieee80211_ampdu_reorder(ni, m, rxs) != 0) {
541 m = NULL;
542 goto out;
543 }
544 resubmit_ampdu:
545
546 /*
547 * Handle privacy requirements. Note that we
548 * must not be preempted from here until after
549 * we (potentially) call ieee80211_crypto_demic;
550 * otherwise we may violate assumptions in the
551 * crypto cipher modules used to do delayed update
552 * of replay sequence numbers.
553 */
554 if (is_hw_decrypted || IEEE80211_IS_PROTECTED(wh)) {
555 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
556 /*
557 * Discard encrypted frames when privacy is off.
558 */
559 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
560 wh, "WEP", "%s", "PRIVACY off");
561 vap->iv_stats.is_rx_noprivacy++;
562 IEEE80211_NODE_STAT(ni, rx_noprivacy);
563 goto out;
564 }
565 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
566 /* NB: stats+msgs handled in crypto_decap */
567 IEEE80211_NODE_STAT(ni, rx_wepfail);
568 goto out;
569 }
570 wh = mtod(m, struct ieee80211_frame *);
571 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
572 has_decrypted = 1;
573 } else {
574 /* XXX M_WEP and IEEE80211_F_PRIVACY */
575 key = NULL;
576 }
577
578 /*
579 * Save QoS bits for use below--before we strip the header.
580 */
581 if (subtype == IEEE80211_FC0_SUBTYPE_QOS_DATA)
582 qos = ieee80211_getqos(wh)[0];
583 else
584 qos = 0;
585
586 /*
587 * Next up, any fragmentation.
588 */
589 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
590 m = ieee80211_defrag(ni, m, hdrspace, has_decrypted);
591 if (m == NULL) {
592 /* Fragment dropped or frame not complete yet */
593 goto out;
594 }
595 }
596 wh = NULL; /* no longer valid, catch any uses */
597
598 /*
599 * Next strip any MSDU crypto bits.
600 */
601 if (!ieee80211_crypto_demic(vap, key, m, 0)) {
602 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
603 ni->ni_macaddr, "data", "%s", "demic error");
604 vap->iv_stats.is_rx_demicfail++;
605 IEEE80211_NODE_STAT(ni, rx_demicfail);
606 goto out;
607 }
608
609 /* copy to listener after decrypt */
610 if (ieee80211_radiotap_active_vap(vap))
611 ieee80211_radiotap_rx(vap, m);
612 need_tap = 0;
613
614 /*
615 * Finally, strip the 802.11 header.
616 */
617 m = ieee80211_decap(vap, m, hdrspace, qos);
618 if (m == NULL) {
619 /* XXX mask bit to check for both */
620 /* don't count Null data frames as errors */
621 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
622 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
623 goto out;
624 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
625 ni->ni_macaddr, "data", "%s", "decap error");
626 vap->iv_stats.is_rx_decap++;
627 IEEE80211_NODE_STAT(ni, rx_decap);
628 goto err;
629 }
630 if (!(qos & IEEE80211_QOS_AMSDU))
631 eh = mtod(m, struct ether_header *);
632 else
633 eh = NULL;
634 if (!ieee80211_node_is_authorized(ni)) {
635 /*
636 * Deny any non-PAE frames received prior to
637 * authorization. For open/shared-key
638 * authentication the port is mark authorized
639 * after authentication completes. For 802.1x
640 * the port is not marked authorized by the
641 * authenticator until the handshake has completed.
642 */
643 if (eh == NULL ||
644 eh->ether_type != htons(ETHERTYPE_PAE)) {
645 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
646 ni->ni_macaddr, "data", "unauthorized or "
647 "unknown port: ether type 0x%x len %u",
648 eh == NULL ? -1 : eh->ether_type,
649 m->m_pkthdr.len);
650 vap->iv_stats.is_rx_unauth++;
651 IEEE80211_NODE_STAT(ni, rx_unauth);
652 goto err;
653 }
654 } else {
655 /*
656 * When denying unencrypted frames, discard
657 * any non-PAE frames received without encryption.
658 */
659 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
660 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
661 (is_hw_decrypted == 0) &&
662 (eh == NULL ||
663 eh->ether_type != htons(ETHERTYPE_PAE))) {
664 /*
665 * Drop unencrypted frames.
666 */
667 vap->iv_stats.is_rx_unencrypted++;
668 IEEE80211_NODE_STAT(ni, rx_unencrypted);
669 goto out;
670 }
671 }
672 /* XXX require HT? */
673 if (qos & IEEE80211_QOS_AMSDU) {
674 m = ieee80211_decap_amsdu(ni, m);
675 if (m == NULL)
676 return IEEE80211_FC0_TYPE_DATA;
677 } else {
678 #ifdef IEEE80211_SUPPORT_SUPERG
679 m = ieee80211_decap_fastframe(vap, ni, m);
680 if (m == NULL)
681 return IEEE80211_FC0_TYPE_DATA;
682 #endif
683 }
684 ieee80211_deliver_data(vap, ni, m);
685 return IEEE80211_FC0_TYPE_DATA;
686
687 case IEEE80211_FC0_TYPE_MGT:
688 vap->iv_stats.is_rx_mgmt++;
689 IEEE80211_NODE_STAT(ni, rx_mgmt);
690 if (dir != IEEE80211_FC1_DIR_NODS) {
691 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
692 wh, "data", "incorrect dir 0x%x", dir);
693 vap->iv_stats.is_rx_wrongdir++;
694 goto err;
695 }
696 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
697 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
698 ni->ni_macaddr, "mgt", "too short: len %u",
699 m->m_pkthdr.len);
700 vap->iv_stats.is_rx_tooshort++;
701 goto out;
702 }
703 #ifdef IEEE80211_DEBUG
704 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) {
705 net80211_vap_printf(vap,
706 "received %s from %s rssi %d\n",
707 ieee80211_mgt_subtype_name(subtype),
708 ether_sprintf(wh->i_addr2), rssi);
709 }
710 #endif
711 if (IEEE80211_IS_PROTECTED(wh)) {
712 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
713 wh, NULL, "%s", "WEP set but not permitted");
714 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
715 goto out;
716 }
717 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
718 goto out;
719
720 case IEEE80211_FC0_TYPE_CTL:
721 vap->iv_stats.is_rx_ctl++;
722 IEEE80211_NODE_STAT(ni, rx_ctrl);
723 goto out;
724
725 default:
726 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
727 wh, "bad", "frame type 0x%x", type);
728 /* should not come here */
729 break;
730 }
731 err:
732 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
733 out:
734 if (m != NULL) {
735 if (need_tap && ieee80211_radiotap_active_vap(vap))
736 ieee80211_radiotap_rx(vap, m);
737 m_freem(m);
738 }
739 return type;
740 }
741
742 static void
wds_recv_mgmt(struct ieee80211_node * ni,struct mbuf * m0,int subtype,const struct ieee80211_rx_stats * rxs,int rssi,int nf)743 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
744 const struct ieee80211_rx_stats *rxs, int rssi, int nf)
745 {
746 struct ieee80211vap *vap = ni->ni_vap;
747 struct ieee80211com *ic = ni->ni_ic;
748 struct ieee80211_frame *wh;
749 u_int8_t *frm, *efrm;
750
751 wh = mtod(m0, struct ieee80211_frame *);
752 frm = (u_int8_t *)&wh[1];
753 efrm = mtod(m0, u_int8_t *) + m0->m_len;
754 switch (subtype) {
755 case IEEE80211_FC0_SUBTYPE_ACTION:
756 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
757 if (ni == vap->iv_bss) {
758 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
759 wh, NULL, "%s", "unknown node");
760 vap->iv_stats.is_rx_mgtdiscard++;
761 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) {
762 /* NB: not interested in multicast frames. */
763 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
764 wh, NULL, "%s", "not for us");
765 vap->iv_stats.is_rx_mgtdiscard++;
766 } else if (vap->iv_state != IEEE80211_S_RUN) {
767 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
768 wh, NULL, "wrong state %s",
769 ieee80211_state_name[vap->iv_state]);
770 vap->iv_stats.is_rx_mgtdiscard++;
771 } else {
772 if (ieee80211_parse_action(ni, m0) == 0)
773 (void)ic->ic_recv_action(ni, wh, frm, efrm);
774 }
775 break;
776
777 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
778 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
779 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
780 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
781 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
782 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
783 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
784 case IEEE80211_FC0_SUBTYPE_BEACON:
785 case IEEE80211_FC0_SUBTYPE_ATIM:
786 case IEEE80211_FC0_SUBTYPE_DISASSOC:
787 case IEEE80211_FC0_SUBTYPE_AUTH:
788 case IEEE80211_FC0_SUBTYPE_DEAUTH:
789 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
790 wh, NULL, "%s", "not handled");
791 vap->iv_stats.is_rx_mgtdiscard++;
792 break;
793
794 default:
795 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
796 wh, "mgt", "subtype 0x%x not handled", subtype);
797 vap->iv_stats.is_rx_badsubtype++;
798 break;
799 }
800 }
801