1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 #include <sys/cdefs.h>
29 #ifdef __FreeBSD__
30 __FBSDID("$FreeBSD: releng/12.0/sys/net80211/ieee80211_wds.c 326272 2017-11-27 15:23:17Z pfg $");
31 #endif
32
33 /*
34 * IEEE 802.11 WDS mode support.
35 */
36 #include "opt_inet.h"
37 #include "opt_wlan.h"
38
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/mbuf.h>
42 #include <sys/malloc.h>
43 #include <sys/kernel.h>
44
45 #include <sys/socket.h>
46 #include <sys/sockio.h>
47 #include <sys/endian.h>
48 #include <sys/errno.h>
49 #include <sys/proc.h>
50 #include <sys/sysctl.h>
51
52 #include <net/if.h>
53 #include <net/if_var.h>
54 #include <net/if_media.h>
55 #include <net/if_llc.h>
56 #include <net/ethernet.h>
57
58 #include <net/bpf.h>
59
60 #include <net80211/ieee80211_var.h>
61 #include <net80211/ieee80211_wds.h>
62 #include <net80211/ieee80211_input.h>
63 #ifdef IEEE80211_SUPPORT_SUPERG
64 #include <net80211/ieee80211_superg.h>
65 #endif
66
67 static void wds_vattach(struct ieee80211vap *);
68 static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int);
69 static int wds_input(struct ieee80211_node *ni, struct mbuf *m,
70 const struct ieee80211_rx_stats *rxs, int, int);
71 static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, int subtype,
72 const struct ieee80211_rx_stats *, int, int);
73
74 void
75 ieee80211_wds_attach(struct ieee80211com *ic)
76 {
77 ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach;
78 }
79
80 void
81 ieee80211_wds_detach(struct ieee80211com *ic)
82 {
83 }
84
85 static void
86 wds_vdetach(struct ieee80211vap *vap)
87 {
88 if (vap->iv_bss != NULL) {
89 /* XXX locking? */
90 if (vap->iv_bss->ni_wdsvap == vap)
91 vap->iv_bss->ni_wdsvap = NULL;
92 }
93 }
94
95 static void
96 wds_vattach(struct ieee80211vap *vap)
97 {
98 vap->iv_newstate = wds_newstate;
99 vap->iv_input = wds_input;
100 vap->iv_recv_mgmt = wds_recv_mgmt;
101 vap->iv_opdetach = wds_vdetach;
102 }
103
104 static void
105 wds_flush(struct ieee80211_node *ni)
106 {
107 struct ieee80211com *ic = ni->ni_ic;
108 struct mbuf *m, *next;
109 int8_t rssi, nf;
110
111 m = ieee80211_ageq_remove(&ic->ic_stageq,
112 (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr));
113 if (m == NULL)
114 return;
115
116 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni,
117 "%s", "flush wds queue");
118 ic->ic_node_getsignal(ni, &rssi, &nf);
119 for (; m != NULL; m = next) {
120 next = m->m_nextpkt;
121 m->m_nextpkt = NULL;
122 ieee80211_input(ni, m, rssi, nf);
123 }
124 }
125
126 static int
127 ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan)
128 {
129 struct ieee80211com *ic = vap->iv_ic;
130 struct ieee80211_node_table *nt = &ic->ic_sta;
131 struct ieee80211_node *ni, *obss;
132
133 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
134 "%s: creating link to %s on channel %u\n", __func__,
135 ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan));
136
137 /* NB: vap create must specify the bssid for the link */
138 KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid"));
139 /* NB: we should only be called on RUN transition */
140 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state"));
141
142 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
143 /*
144 * Dynamic/non-legacy WDS. Reference the associated
145 * station specified by the desired bssid setup at vap
146 * create. Point ni_wdsvap at the WDS vap so 4-address
147 * frames received through the associated AP vap will
148 * be dispatched upward (e.g. to a bridge) as though
149 * they arrived on the WDS vap.
150 */
151 IEEE80211_NODE_LOCK(nt);
152 obss = NULL;
153 ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid);
154 if (ni == NULL) {
155 /*
156 * Node went away before we could hookup. This
157 * should be ok; no traffic will flow and a leave
158 * event will be dispatched that should cause
159 * the vap to be destroyed.
160 */
161 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
162 "%s: station %s went away\n",
163 __func__, ether_sprintf(vap->iv_des_bssid));
164 /* XXX stat? */
165 } else if (ni->ni_wdsvap != NULL) {
166 /*
167 * Node already setup with a WDS vap; we cannot
168 * allow multiple references so disallow. If
169 * ni_wdsvap points at us that's ok; we should
170 * do nothing anyway.
171 */
172 /* XXX printf instead? */
173 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
174 "%s: station %s in use with %s\n",
175 __func__, ether_sprintf(vap->iv_des_bssid),
176 ni->ni_wdsvap->iv_ifp->if_xname);
177 /* XXX stat? */
178 } else {
179 /*
180 * Committed to new node, setup state.
181 */
182 obss = vap->iv_bss;
183 vap->iv_bss = ni;
184 ni->ni_wdsvap = vap;
185 }
186 IEEE80211_NODE_UNLOCK(nt);
187 if (obss != NULL) {
188 /* NB: deferred to avoid recursive lock */
189 ieee80211_free_node(obss);
190 }
191 } else {
192 /*
193 * Legacy WDS vap setup.
194 */
195 /*
196 * The far end does not associate so we just create
197 * create a new node and install it as the vap's
198 * bss node. We must simulate an association and
199 * authorize the port for traffic to flow.
200 * XXX check if node already in sta table?
201 */
202 ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan);
203 if (ni != NULL) {
204 obss = vap->iv_bss;
205 vap->iv_bss = ieee80211_ref_node(ni);
206 ni->ni_flags |= IEEE80211_NODE_AREF;
207 if (obss != NULL)
208 ieee80211_free_node(obss);
209 /* give driver a chance to setup state like ni_txrate */
210 if (ic->ic_newassoc != NULL)
211 ic->ic_newassoc(ni, 1);
212 /* tell the authenticator about new station */
213 if (vap->iv_auth->ia_node_join != NULL)
214 vap->iv_auth->ia_node_join(ni);
215 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
216 ieee80211_node_authorize(ni);
217
218 ieee80211_notify_node_join(ni, 1 /*newassoc*/);
219 /* XXX inject l2uf frame */
220 }
221 }
222
223 /*
224 * Flush any pending frames now that were setup.
225 */
226 if (ni != NULL)
227 wds_flush(ni);
228 return (ni == NULL ? ENOENT : 0);
229 }
230
231 /*
232 * Propagate multicast frames of an ap vap to all DWDS links.
233 * The caller is assumed to have verified this frame is multicast.
234 */
235 void
236 ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m)
237 {
238 struct ieee80211com *ic = vap0->iv_ic;
239 const struct ether_header *eh = mtod(m, const struct ether_header *);
240 struct ieee80211_node *ni;
241 struct ieee80211vap *vap;
242 struct ifnet *ifp;
243 struct mbuf *mcopy;
244 int err;
245
246 KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost),
247 ("%s not mcast", ether_sprintf(eh->ether_dhost)));
248
249 /* XXX locking */
250 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
251 /* only DWDS vaps are interesting */
252 if (vap->iv_opmode != IEEE80211_M_WDS ||
253 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))
254 continue;
255 /* if it came in this interface, don't send it back out */
256 ifp = vap->iv_ifp;
257 if (ifp == m->m_pkthdr.rcvif)
258 continue;
259 /*
260 * Duplicate the frame and send it.
261 */
262 mcopy = m_copypacket(m, M_NOWAIT);
263 if (mcopy == NULL) {
264 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
265 /* XXX stat + msg */
266 continue;
267 }
268 ni = ieee80211_find_txnode(vap, eh->ether_dhost);
269 if (ni == NULL) {
270 /* NB: ieee80211_find_txnode does stat+msg */
271 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
272 m_freem(mcopy);
273 continue;
274 }
275 /* calculate priority so drivers can find the tx queue */
276 if (ieee80211_classify(ni, mcopy)) {
277 IEEE80211_DISCARD_MAC(vap,
278 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS,
279 eh->ether_dhost, NULL,
280 "%s", "classification failure");
281 vap->iv_stats.is_tx_classify++;
282 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
283 m_freem(mcopy);
284 ieee80211_free_node(ni);
285 continue;
286 }
287
288 BPF_MTAP(ifp, m); /* 802.3 tx */
289
290 /*
291 * Encapsulate the packet in prep for transmission.
292 */
293 IEEE80211_TX_LOCK(ic);
294 mcopy = ieee80211_encap(vap, ni, mcopy);
295 if (mcopy == NULL) {
296 /* NB: stat+msg handled in ieee80211_encap */
297 IEEE80211_TX_UNLOCK(ic);
298 ieee80211_free_node(ni);
299 continue;
300 }
301 mcopy->m_flags |= M_MCAST;
302 mcopy->m_pkthdr.rcvif = (void *) ni;
303
304 err = ieee80211_parent_xmitpkt(ic, mcopy);
305 IEEE80211_TX_UNLOCK(ic);
306 if (!err) {
307 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
308 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
309 if_inc_counter(ifp, IFCOUNTER_OBYTES,
310 m->m_pkthdr.len);
311 }
312 }
313 }
314
315 /*
316 * Handle DWDS discovery on receipt of a 4-address frame in
317 * ap mode. Queue the frame and post an event for someone
318 * to plumb the necessary WDS vap for this station. Frames
319 * received prior to the vap set running will then be reprocessed
320 * as if they were just received.
321 */
322 void
323 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m)
324 {
325 struct ieee80211com *ic = ni->ni_ic;
326
327 /*
328 * Save the frame with an aging interval 4 times
329 * the listen interval specified by the station.
330 * Frames that sit around too long are reclaimed
331 * using this information.
332 * XXX handle overflow?
333 * XXX per/vap beacon interval?
334 */
335 m->m_pkthdr.rcvif = (void *)(uintptr_t)
336 ieee80211_mac_hash(ic, ni->ni_macaddr);
337 (void) ieee80211_ageq_append(&ic->ic_stageq, m,
338 ((ni->ni_intval * ic->ic_lintval) << 2) / 1024);
339 ieee80211_notify_wds_discover(ni);
340 }
341
342 /*
343 * IEEE80211_M_WDS vap state machine handler.
344 */
345 static int
346 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
347 {
348 struct ieee80211com *ic = vap->iv_ic;
349 enum ieee80211_state ostate;
350 int error;
351
352 IEEE80211_LOCK_ASSERT(ic);
353
354 ostate = vap->iv_state;
355 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__,
356 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
357 vap->iv_state = nstate; /* state transition */
358 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */
359 if (ostate != IEEE80211_S_SCAN)
360 ieee80211_cancel_scan(vap); /* background scan */
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
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 int is_hw_decrypted = 0;
423 int has_decrypted = 0;
424
425 /*
426 * Some devices do hardware decryption all the way through
427 * to pretending the frame wasn't encrypted in the first place.
428 * So, tag it appropriately so it isn't discarded inappropriately.
429 */
430 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED))
431 is_hw_decrypted = 1;
432
433 if (m->m_flags & M_AMPDU_MPDU) {
434 /*
435 * Fastpath for A-MPDU reorder q resubmission. Frames
436 * w/ M_AMPDU_MPDU marked have already passed through
437 * here but were received out of order and been held on
438 * the reorder queue. When resubmitted they are marked
439 * with the M_AMPDU_MPDU flag and we can bypass most of
440 * the normal processing.
441 */
442 wh = mtod(m, struct ieee80211_frame *);
443 type = IEEE80211_FC0_TYPE_DATA;
444 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
445 subtype = IEEE80211_FC0_SUBTYPE_QOS;
446 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
447 goto resubmit_ampdu;
448 }
449
450 KASSERT(ni != NULL, ("null node"));
451
452 type = -1; /* undefined */
453
454 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
455 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
456 ni->ni_macaddr, NULL,
457 "too short (1): len %u", m->m_pkthdr.len);
458 vap->iv_stats.is_rx_tooshort++;
459 goto out;
460 }
461 /*
462 * Bit of a cheat here, we use a pointer for a 3-address
463 * frame format but don't reference fields past outside
464 * ieee80211_frame_min w/o first validating the data is
465 * present.
466 */
467 wh = mtod(m, struct ieee80211_frame *);
468
469 if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
470 ni->ni_inact = ni->ni_inact_reload;
471
472 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
473 IEEE80211_FC0_VERSION_0) {
474 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
475 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
476 wh->i_fc[0], wh->i_fc[1]);
477 vap->iv_stats.is_rx_badversion++;
478 goto err;
479 }
480
481 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
482 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
483 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
484
485 /* NB: WDS vap's do not scan */
486 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) {
487 IEEE80211_DISCARD_MAC(vap,
488 IEEE80211_MSG_ANY, ni->ni_macaddr, NULL,
489 "too short (3): len %u", m->m_pkthdr.len);
490 vap->iv_stats.is_rx_tooshort++;
491 goto out;
492 }
493 /* NB: the TA is implicitly verified by finding the wds peer node */
494 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) &&
495 !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) {
496 /* not interested in */
497 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
498 wh->i_addr1, NULL, "%s", "not to bss");
499 vap->iv_stats.is_rx_wrongbss++;
500 goto out;
501 }
502 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
503 ni->ni_noise = nf;
504 if (IEEE80211_HAS_SEQ(type, subtype)) {
505 uint8_t tid = ieee80211_gettid(wh);
506 if (IEEE80211_QOS_HAS_SEQ(wh) &&
507 TID_TO_WME_AC(tid) >= WME_AC_VI)
508 ic->ic_wme.wme_hipri_traffic++;
509 if (! ieee80211_check_rxseq(ni, wh, wh->i_addr1, rxs))
510 goto out;
511 }
512 switch (type) {
513 case IEEE80211_FC0_TYPE_DATA:
514 hdrspace = ieee80211_hdrspace(ic, wh);
515 if (m->m_len < hdrspace &&
516 (m = m_pullup(m, hdrspace)) == NULL) {
517 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
518 ni->ni_macaddr, NULL,
519 "data too short: expecting %u", hdrspace);
520 vap->iv_stats.is_rx_tooshort++;
521 goto out; /* XXX */
522 }
523 if (dir != IEEE80211_FC1_DIR_DSTODS) {
524 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
525 wh, "data", "incorrect dir 0x%x", dir);
526 vap->iv_stats.is_rx_wrongdir++;
527 goto out;
528 }
529 /*
530 * Only legacy WDS traffic should take this path.
531 */
532 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
533 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
534 wh, "data", "%s", "not legacy wds");
535 vap->iv_stats.is_rx_wrongdir++;/*XXX*/
536 goto out;
537 }
538 /*
539 * Handle A-MPDU re-ordering. If the frame is to be
540 * processed directly then ieee80211_ampdu_reorder
541 * will return 0; otherwise it has consumed the mbuf
542 * and we should do nothing more with it.
543 */
544 if ((m->m_flags & M_AMPDU) &&
545 ieee80211_ampdu_reorder(ni, m, rxs) != 0) {
546 m = NULL;
547 goto out;
548 }
549 resubmit_ampdu:
550
551 /*
552 * Handle privacy requirements. Note that we
553 * must not be preempted from here until after
554 * we (potentially) call ieee80211_crypto_demic;
555 * otherwise we may violate assumptions in the
556 * crypto cipher modules used to do delayed update
557 * of replay sequence numbers.
558 */
559 if (is_hw_decrypted || wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
560 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
561 /*
562 * Discard encrypted frames when privacy is off.
563 */
564 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
565 wh, "WEP", "%s", "PRIVACY off");
566 vap->iv_stats.is_rx_noprivacy++;
567 IEEE80211_NODE_STAT(ni, rx_noprivacy);
568 goto out;
569 }
570 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
571 /* NB: stats+msgs handled in crypto_decap */
572 IEEE80211_NODE_STAT(ni, rx_wepfail);
573 goto out;
574 }
575 wh = mtod(m, struct ieee80211_frame *);
576 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
577 has_decrypted = 1;
578 } else {
579 /* XXX M_WEP and IEEE80211_F_PRIVACY */
580 key = NULL;
581 }
582
583 /*
584 * Save QoS bits for use below--before we strip the header.
585 */
586 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
587 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
588 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
589 ((struct ieee80211_qosframe *)wh)->i_qos[0];
590 } else
591 qos = 0;
592
593 /*
594 * Next up, any fragmentation.
595 */
596 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
597 m = ieee80211_defrag(ni, m, hdrspace);
598 if (m == NULL) {
599 /* Fragment dropped or frame not complete yet */
600 goto out;
601 }
602 }
603 wh = NULL; /* no longer valid, catch any uses */
604
605 /*
606 * Next strip any MSDU crypto bits.
607 */
608 if (!ieee80211_crypto_demic(vap, key, m, 0)) {
609 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
610 ni->ni_macaddr, "data", "%s", "demic error");
611 vap->iv_stats.is_rx_demicfail++;
612 IEEE80211_NODE_STAT(ni, rx_demicfail);
613 goto out;
614 }
615
616 /* copy to listener after decrypt */
617 if (ieee80211_radiotap_active_vap(vap))
618 ieee80211_radiotap_rx(vap, m);
619 need_tap = 0;
620
621 /*
622 * Finally, strip the 802.11 header.
623 */
624 m = ieee80211_decap(vap, m, hdrspace);
625 if (m == NULL) {
626 /* XXX mask bit to check for both */
627 /* don't count Null data frames as errors */
628 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
629 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
630 goto out;
631 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
632 ni->ni_macaddr, "data", "%s", "decap error");
633 vap->iv_stats.is_rx_decap++;
634 IEEE80211_NODE_STAT(ni, rx_decap);
635 goto err;
636 }
637 eh = mtod(m, struct ether_header *);
638 if (!ieee80211_node_is_authorized(ni)) {
639 /*
640 * Deny any non-PAE frames received prior to
641 * authorization. For open/shared-key
642 * authentication the port is mark authorized
643 * after authentication completes. For 802.1x
644 * the port is not marked authorized by the
645 * authenticator until the handshake has completed.
646 */
647 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
648 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
649 eh->ether_shost, "data",
650 "unauthorized port: ether type 0x%x len %u",
651 eh->ether_type, m->m_pkthdr.len);
652 vap->iv_stats.is_rx_unauth++;
653 IEEE80211_NODE_STAT(ni, rx_unauth);
654 goto err;
655 }
656 } else {
657 /*
658 * When denying unencrypted frames, discard
659 * any non-PAE frames received without encryption.
660 */
661 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
662 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
663 (is_hw_decrypted == 0) &&
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 (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
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
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 }
Cache object: b330e8e85f1fee48440203f280529b95
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