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/if_private.h>
52 #include <net/ethernet.h>
53
54 #include <net/bpf.h>
55
56 #include <net80211/ieee80211_var.h>
57 #include <net80211/ieee80211_wds.h>
58 #include <net80211/ieee80211_input.h>
59 #ifdef IEEE80211_SUPPORT_SUPERG
60 #include <net80211/ieee80211_superg.h>
61 #endif
62
63 static void wds_vattach(struct ieee80211vap *);
64 static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int);
65 static int wds_input(struct ieee80211_node *ni, struct mbuf *m,
66 const struct ieee80211_rx_stats *rxs, int, int);
67 static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, int subtype,
68 const struct ieee80211_rx_stats *, int, int);
69
70 void
ieee80211_wds_attach(struct ieee80211com * ic)71 ieee80211_wds_attach(struct ieee80211com *ic)
72 {
73 ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach;
74 }
75
76 void
ieee80211_wds_detach(struct ieee80211com * ic)77 ieee80211_wds_detach(struct ieee80211com *ic)
78 {
79 }
80
81 static void
wds_vdetach(struct ieee80211vap * vap)82 wds_vdetach(struct ieee80211vap *vap)
83 {
84 if (vap->iv_bss != NULL) {
85 /* XXX locking? */
86 if (vap->iv_bss->ni_wdsvap == vap)
87 vap->iv_bss->ni_wdsvap = NULL;
88 }
89 }
90
91 static void
wds_vattach(struct ieee80211vap * vap)92 wds_vattach(struct ieee80211vap *vap)
93 {
94 vap->iv_newstate = wds_newstate;
95 vap->iv_input = wds_input;
96 vap->iv_recv_mgmt = wds_recv_mgmt;
97 vap->iv_opdetach = wds_vdetach;
98 }
99
100 static void
wds_flush(struct ieee80211_node * ni)101 wds_flush(struct ieee80211_node *ni)
102 {
103 struct ieee80211com *ic = ni->ni_ic;
104 struct mbuf *m, *next;
105 int8_t rssi, nf;
106
107 m = ieee80211_ageq_remove(&ic->ic_stageq,
108 (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr));
109 if (m == NULL)
110 return;
111
112 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni,
113 "%s", "flush wds queue");
114 ic->ic_node_getsignal(ni, &rssi, &nf);
115 for (; m != NULL; m = next) {
116 next = m->m_nextpkt;
117 m->m_nextpkt = NULL;
118 ieee80211_input(ni, m, rssi, nf);
119 }
120 }
121
122 static int
ieee80211_create_wds(struct ieee80211vap * vap,struct ieee80211_channel * chan)123 ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan)
124 {
125 struct ieee80211com *ic = vap->iv_ic;
126 struct ieee80211_node_table *nt = &ic->ic_sta;
127 struct ieee80211_node *ni, *obss;
128
129 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
130 "%s: creating link to %s on channel %u\n", __func__,
131 ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan));
132
133 /* NB: vap create must specify the bssid for the link */
134 KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid"));
135 /* NB: we should only be called on RUN transition */
136 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state"));
137
138 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
139 /*
140 * Dynamic/non-legacy WDS. Reference the associated
141 * station specified by the desired bssid setup at vap
142 * create. Point ni_wdsvap at the WDS vap so 4-address
143 * frames received through the associated AP vap will
144 * be dispatched upward (e.g. to a bridge) as though
145 * they arrived on the WDS vap.
146 */
147 IEEE80211_NODE_LOCK(nt);
148 obss = NULL;
149 ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid);
150 if (ni == NULL) {
151 /*
152 * Node went away before we could hookup. This
153 * should be ok; no traffic will flow and a leave
154 * event will be dispatched that should cause
155 * the vap to be destroyed.
156 */
157 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
158 "%s: station %s went away\n",
159 __func__, ether_sprintf(vap->iv_des_bssid));
160 /* XXX stat? */
161 } else if (ni->ni_wdsvap != NULL) {
162 /*
163 * Node already setup with a WDS vap; we cannot
164 * allow multiple references so disallow. If
165 * ni_wdsvap points at us that's ok; we should
166 * do nothing anyway.
167 */
168 /* XXX printf instead? */
169 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
170 "%s: station %s in use with %s\n",
171 __func__, ether_sprintf(vap->iv_des_bssid),
172 ni->ni_wdsvap->iv_ifp->if_xname);
173 /* XXX stat? */
174 } else {
175 /*
176 * Committed to new node, setup state.
177 */
178 obss = vap->iv_update_bss(vap, ni);
179 ni->ni_wdsvap = vap;
180 }
181 IEEE80211_NODE_UNLOCK(nt);
182 if (obss != NULL) {
183 /* NB: deferred to avoid recursive lock */
184 ieee80211_free_node(obss);
185 }
186 } else {
187 /*
188 * Legacy WDS vap setup.
189 */
190 /*
191 * The far end does not associate so we just create
192 * create a new node and install it as the vap's
193 * bss node. We must simulate an association and
194 * authorize the port for traffic to flow.
195 * XXX check if node already in sta table?
196 */
197 ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan);
198 if (ni != NULL) {
199 obss = vap->iv_update_bss(vap, ieee80211_ref_node(ni));
200 ni->ni_flags |= IEEE80211_NODE_AREF;
201 if (obss != NULL)
202 ieee80211_free_node(obss);
203 /* give driver a chance to setup state like ni_txrate */
204 if (ic->ic_newassoc != NULL)
205 ic->ic_newassoc(ni, 1);
206 /* tell the authenticator about new station */
207 if (vap->iv_auth->ia_node_join != NULL)
208 vap->iv_auth->ia_node_join(ni);
209 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
210 ieee80211_node_authorize(ni);
211
212 ieee80211_notify_node_join(ni, 1 /*newassoc*/);
213 /* XXX inject l2uf frame */
214 }
215 }
216
217 /*
218 * Flush any pending frames now that were setup.
219 */
220 if (ni != NULL)
221 wds_flush(ni);
222 return (ni == NULL ? ENOENT : 0);
223 }
224
225 /*
226 * Propagate multicast frames of an ap vap to all DWDS links.
227 * The caller is assumed to have verified this frame is multicast.
228 */
229 void
ieee80211_dwds_mcast(struct ieee80211vap * vap0,struct mbuf * m)230 ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m)
231 {
232 struct ieee80211com *ic = vap0->iv_ic;
233 const struct ether_header *eh = mtod(m, const struct ether_header *);
234 struct ieee80211_node *ni;
235 struct ieee80211vap *vap;
236 struct ifnet *ifp;
237 struct mbuf *mcopy;
238 int err;
239
240 KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost),
241 ("%s not mcast", ether_sprintf(eh->ether_dhost)));
242
243 /* XXX locking */
244 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
245 /* only DWDS vaps are interesting */
246 if (vap->iv_opmode != IEEE80211_M_WDS ||
247 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))
248 continue;
249 /* if it came in this interface, don't send it back out */
250 ifp = vap->iv_ifp;
251 if (ifp == m->m_pkthdr.rcvif)
252 continue;
253 /*
254 * Duplicate the frame and send it.
255 */
256 mcopy = m_copypacket(m, IEEE80211_M_NOWAIT);
257 if (mcopy == NULL) {
258 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
259 /* XXX stat + msg */
260 continue;
261 }
262 ni = ieee80211_find_txnode(vap, eh->ether_dhost);
263 if (ni == NULL) {
264 /* NB: ieee80211_find_txnode does stat+msg */
265 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
266 m_freem(mcopy);
267 continue;
268 }
269 /* calculate priority so drivers can find the tx queue */
270 if (ieee80211_classify(ni, mcopy)) {
271 IEEE80211_DISCARD_MAC(vap,
272 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS,
273 eh->ether_dhost, NULL,
274 "%s", "classification failure");
275 vap->iv_stats.is_tx_classify++;
276 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
277 m_freem(mcopy);
278 ieee80211_free_node(ni);
279 continue;
280 }
281
282 BPF_MTAP(ifp, m); /* 802.3 tx */
283
284 /*
285 * Encapsulate the packet in prep for transmission.
286 */
287 IEEE80211_TX_LOCK(ic);
288 mcopy = ieee80211_encap(vap, ni, mcopy);
289 if (mcopy == NULL) {
290 /* NB: stat+msg handled in ieee80211_encap */
291 IEEE80211_TX_UNLOCK(ic);
292 ieee80211_free_node(ni);
293 continue;
294 }
295 mcopy->m_flags |= M_MCAST;
296 MPASS((mcopy->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
297 mcopy->m_pkthdr.rcvif = (void *) ni;
298
299 err = ieee80211_parent_xmitpkt(ic, mcopy);
300 IEEE80211_TX_UNLOCK(ic);
301 if (!err) {
302 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
303 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
304 if_inc_counter(ifp, IFCOUNTER_OBYTES,
305 m->m_pkthdr.len);
306 }
307 }
308 }
309
310 /*
311 * Handle DWDS discovery on receipt of a 4-address frame in
312 * ap mode. Queue the frame and post an event for someone
313 * to plumb the necessary WDS vap for this station. Frames
314 * received prior to the vap set running will then be reprocessed
315 * as if they were just received.
316 */
317 void
ieee80211_dwds_discover(struct ieee80211_node * ni,struct mbuf * m)318 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m)
319 {
320 struct ieee80211com *ic = ni->ni_ic;
321
322 /*
323 * Save the frame with an aging interval 4 times
324 * the listen interval specified by the station.
325 * Frames that sit around too long are reclaimed
326 * using this information.
327 * XXX handle overflow?
328 * XXX per/vap beacon interval?
329 */
330 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
331 m->m_pkthdr.rcvif = (void *)(uintptr_t)
332 ieee80211_mac_hash(ic, ni->ni_macaddr);
333 (void) ieee80211_ageq_append(&ic->ic_stageq, m,
334 ((ni->ni_intval * ic->ic_lintval) << 2) / 1024);
335 ieee80211_notify_wds_discover(ni);
336 }
337
338 /*
339 * IEEE80211_M_WDS vap state machine handler.
340 */
341 static int
wds_newstate(struct ieee80211vap * vap,enum ieee80211_state nstate,int arg)342 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
343 {
344 struct ieee80211com *ic = vap->iv_ic;
345 enum ieee80211_state ostate;
346 int error;
347
348 IEEE80211_LOCK_ASSERT(ic);
349
350 ostate = vap->iv_state;
351 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__,
352 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
353 vap->iv_state = nstate; /* state transition */
354 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */
355 if (ostate != IEEE80211_S_SCAN)
356 ieee80211_cancel_scan(vap); /* background scan */
357 error = 0;
358 switch (nstate) {
359 case IEEE80211_S_INIT:
360 switch (ostate) {
361 case IEEE80211_S_SCAN:
362 ieee80211_cancel_scan(vap);
363 break;
364 default:
365 break;
366 }
367 if (ostate != IEEE80211_S_INIT) {
368 /* NB: optimize INIT -> INIT case */
369 ieee80211_reset_bss(vap);
370 }
371 break;
372 case IEEE80211_S_SCAN:
373 switch (ostate) {
374 case IEEE80211_S_INIT:
375 ieee80211_check_scan_current(vap);
376 break;
377 default:
378 break;
379 }
380 break;
381 case IEEE80211_S_RUN:
382 if (ostate == IEEE80211_S_INIT) {
383 /*
384 * Already have a channel; bypass the scan
385 * and startup immediately.
386 */
387 error = ieee80211_create_wds(vap, ic->ic_curchan);
388 }
389 break;
390 default:
391 break;
392 }
393 return error;
394 }
395
396 /*
397 * Process a received frame. The node associated with the sender
398 * should be supplied. If nothing was found in the node table then
399 * the caller is assumed to supply a reference to iv_bss instead.
400 * The RSSI and a timestamp are also supplied. The RSSI data is used
401 * during AP scanning to select a AP to associate with; it can have
402 * any units so long as values have consistent units and higher values
403 * mean ``better signal''. The receive timestamp is currently not used
404 * by the 802.11 layer.
405 */
406 static int
wds_input(struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_rx_stats * rxs,int rssi,int nf)407 wds_input(struct ieee80211_node *ni, struct mbuf *m,
408 const struct ieee80211_rx_stats *rxs, int rssi, int nf)
409 {
410 struct ieee80211vap *vap = ni->ni_vap;
411 struct ieee80211com *ic = ni->ni_ic;
412 struct ifnet *ifp = vap->iv_ifp;
413 struct ieee80211_frame *wh;
414 struct ieee80211_key *key;
415 struct ether_header *eh;
416 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
417 uint8_t dir, type, subtype, qos;
418 int is_hw_decrypted = 0;
419 int has_decrypted = 0;
420
421 /*
422 * Some devices do hardware decryption all the way through
423 * to pretending the frame wasn't encrypted in the first place.
424 * So, tag it appropriately so it isn't discarded inappropriately.
425 */
426 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED))
427 is_hw_decrypted = 1;
428
429 if (m->m_flags & M_AMPDU_MPDU) {
430 /*
431 * Fastpath for A-MPDU reorder q resubmission. Frames
432 * w/ M_AMPDU_MPDU marked have already passed through
433 * here but were received out of order and been held on
434 * the reorder queue. When resubmitted they are marked
435 * with the M_AMPDU_MPDU flag and we can bypass most of
436 * the normal processing.
437 */
438 wh = mtod(m, struct ieee80211_frame *);
439 type = IEEE80211_FC0_TYPE_DATA;
440 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
441 subtype = IEEE80211_FC0_SUBTYPE_QOS_DATA;
442 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
443 goto resubmit_ampdu;
444 }
445
446 KASSERT(ni != NULL, ("null node"));
447
448 type = -1; /* undefined */
449
450 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
451 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
452 ni->ni_macaddr, NULL,
453 "too short (1): len %u", m->m_pkthdr.len);
454 vap->iv_stats.is_rx_tooshort++;
455 goto out;
456 }
457 /*
458 * Bit of a cheat here, we use a pointer for a 3-address
459 * frame format but don't reference fields past outside
460 * ieee80211_frame_min w/o first validating the data is
461 * present.
462 */
463 wh = mtod(m, struct ieee80211_frame *);
464
465 if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
466 ni->ni_inact = ni->ni_inact_reload;
467
468 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
469 IEEE80211_FC0_VERSION_0) {
470 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
471 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
472 wh->i_fc[0], wh->i_fc[1]);
473 vap->iv_stats.is_rx_badversion++;
474 goto err;
475 }
476
477 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
478 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
479 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
480
481 /* NB: WDS vap's do not scan */
482 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) {
483 IEEE80211_DISCARD_MAC(vap,
484 IEEE80211_MSG_ANY, ni->ni_macaddr, NULL,
485 "too short (3): len %u", m->m_pkthdr.len);
486 vap->iv_stats.is_rx_tooshort++;
487 goto out;
488 }
489 /* NB: the TA is implicitly verified by finding the wds peer node */
490 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) &&
491 !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) {
492 /* not interested in */
493 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
494 wh->i_addr1, NULL, "%s", "not to bss");
495 vap->iv_stats.is_rx_wrongbss++;
496 goto out;
497 }
498 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
499 ni->ni_noise = nf;
500 if (IEEE80211_HAS_SEQ(type, subtype)) {
501 uint8_t tid = ieee80211_gettid(wh);
502 if (IEEE80211_QOS_HAS_SEQ(wh) &&
503 TID_TO_WME_AC(tid) >= WME_AC_VI)
504 ic->ic_wme.wme_hipri_traffic++;
505 if (! ieee80211_check_rxseq(ni, wh, wh->i_addr1, rxs))
506 goto out;
507 }
508 switch (type) {
509 case IEEE80211_FC0_TYPE_DATA:
510 hdrspace = ieee80211_hdrspace(ic, wh);
511 if (m->m_len < hdrspace &&
512 (m = m_pullup(m, hdrspace)) == NULL) {
513 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
514 ni->ni_macaddr, NULL,
515 "data too short: expecting %u", hdrspace);
516 vap->iv_stats.is_rx_tooshort++;
517 goto out; /* XXX */
518 }
519 if (dir != IEEE80211_FC1_DIR_DSTODS) {
520 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
521 wh, "data", "incorrect dir 0x%x", dir);
522 vap->iv_stats.is_rx_wrongdir++;
523 goto out;
524 }
525 /*
526 * Only legacy WDS traffic should take this path.
527 */
528 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
529 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
530 wh, "data", "%s", "not legacy wds");
531 vap->iv_stats.is_rx_wrongdir++;/*XXX*/
532 goto out;
533 }
534 /*
535 * Handle A-MPDU re-ordering. If the frame is to be
536 * processed directly then ieee80211_ampdu_reorder
537 * will return 0; otherwise it has consumed the mbuf
538 * and we should do nothing more with it.
539 */
540 if ((m->m_flags & M_AMPDU) &&
541 ieee80211_ampdu_reorder(ni, m, rxs) != 0) {
542 m = NULL;
543 goto out;
544 }
545 resubmit_ampdu:
546
547 /*
548 * Handle privacy requirements. Note that we
549 * must not be preempted from here until after
550 * we (potentially) call ieee80211_crypto_demic;
551 * otherwise we may violate assumptions in the
552 * crypto cipher modules used to do delayed update
553 * of replay sequence numbers.
554 */
555 if (is_hw_decrypted || IEEE80211_IS_PROTECTED(wh)) {
556 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
557 /*
558 * Discard encrypted frames when privacy is off.
559 */
560 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
561 wh, "WEP", "%s", "PRIVACY off");
562 vap->iv_stats.is_rx_noprivacy++;
563 IEEE80211_NODE_STAT(ni, rx_noprivacy);
564 goto out;
565 }
566 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
567 /* NB: stats+msgs handled in crypto_decap */
568 IEEE80211_NODE_STAT(ni, rx_wepfail);
569 goto out;
570 }
571 wh = mtod(m, struct ieee80211_frame *);
572 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
573 has_decrypted = 1;
574 } else {
575 /* XXX M_WEP and IEEE80211_F_PRIVACY */
576 key = NULL;
577 }
578
579 /*
580 * Save QoS bits for use below--before we strip the header.
581 */
582 if (subtype == IEEE80211_FC0_SUBTYPE_QOS_DATA)
583 qos = ieee80211_getqos(wh)[0];
584 else
585 qos = 0;
586
587 /*
588 * Next up, any fragmentation.
589 */
590 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
591 m = ieee80211_defrag(ni, m, hdrspace, has_decrypted);
592 if (m == NULL) {
593 /* Fragment dropped or frame not complete yet */
594 goto out;
595 }
596 }
597 wh = NULL; /* no longer valid, catch any uses */
598
599 /*
600 * Next strip any MSDU crypto bits.
601 */
602 if (!ieee80211_crypto_demic(vap, key, m, 0)) {
603 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
604 ni->ni_macaddr, "data", "%s", "demic error");
605 vap->iv_stats.is_rx_demicfail++;
606 IEEE80211_NODE_STAT(ni, rx_demicfail);
607 goto out;
608 }
609
610 /* copy to listener after decrypt */
611 if (ieee80211_radiotap_active_vap(vap))
612 ieee80211_radiotap_rx(vap, m);
613 need_tap = 0;
614
615 /*
616 * Finally, strip the 802.11 header.
617 */
618 m = ieee80211_decap(vap, m, hdrspace, qos);
619 if (m == NULL) {
620 /* XXX mask bit to check for both */
621 /* don't count Null data frames as errors */
622 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
623 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
624 goto out;
625 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
626 ni->ni_macaddr, "data", "%s", "decap error");
627 vap->iv_stats.is_rx_decap++;
628 IEEE80211_NODE_STAT(ni, rx_decap);
629 goto err;
630 }
631 if (!(qos & IEEE80211_QOS_AMSDU))
632 eh = mtod(m, struct ether_header *);
633 else
634 eh = NULL;
635 if (!ieee80211_node_is_authorized(ni)) {
636 /*
637 * Deny any non-PAE frames received prior to
638 * authorization. For open/shared-key
639 * authentication the port is mark authorized
640 * after authentication completes. For 802.1x
641 * the port is not marked authorized by the
642 * authenticator until the handshake has completed.
643 */
644 if (eh == NULL ||
645 eh->ether_type != htons(ETHERTYPE_PAE)) {
646 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
647 ni->ni_macaddr, "data", "unauthorized or "
648 "unknown port: ether type 0x%x len %u",
649 eh == NULL ? -1 : eh->ether_type,
650 m->m_pkthdr.len);
651 vap->iv_stats.is_rx_unauth++;
652 IEEE80211_NODE_STAT(ni, rx_unauth);
653 goto err;
654 }
655 } else {
656 /*
657 * When denying unencrypted frames, discard
658 * any non-PAE frames received without encryption.
659 */
660 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
661 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
662 (is_hw_decrypted == 0) &&
663 (eh == NULL ||
664 eh->ether_type != htons(ETHERTYPE_PAE))) {
665 /*
666 * Drop unencrypted frames.
667 */
668 vap->iv_stats.is_rx_unencrypted++;
669 IEEE80211_NODE_STAT(ni, rx_unencrypted);
670 goto out;
671 }
672 }
673 /* XXX require HT? */
674 if (qos & IEEE80211_QOS_AMSDU) {
675 m = ieee80211_decap_amsdu(ni, m);
676 if (m == NULL)
677 return IEEE80211_FC0_TYPE_DATA;
678 } else {
679 #ifdef IEEE80211_SUPPORT_SUPERG
680 m = ieee80211_decap_fastframe(vap, ni, m);
681 if (m == NULL)
682 return IEEE80211_FC0_TYPE_DATA;
683 #endif
684 }
685 ieee80211_deliver_data(vap, ni, m);
686 return IEEE80211_FC0_TYPE_DATA;
687
688 case IEEE80211_FC0_TYPE_MGT:
689 vap->iv_stats.is_rx_mgmt++;
690 IEEE80211_NODE_STAT(ni, rx_mgmt);
691 if (dir != IEEE80211_FC1_DIR_NODS) {
692 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
693 wh, "data", "incorrect dir 0x%x", dir);
694 vap->iv_stats.is_rx_wrongdir++;
695 goto err;
696 }
697 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
698 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
699 ni->ni_macaddr, "mgt", "too short: len %u",
700 m->m_pkthdr.len);
701 vap->iv_stats.is_rx_tooshort++;
702 goto out;
703 }
704 #ifdef IEEE80211_DEBUG
705 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) {
706 if_printf(ifp, "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