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("$FreeBSD$");
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_update_bss(vap, ni);
183 ni->ni_wdsvap = vap;
184 }
185 IEEE80211_NODE_UNLOCK(nt);
186 if (obss != NULL) {
187 /* NB: deferred to avoid recursive lock */
188 ieee80211_free_node(obss);
189 }
190 } else {
191 /*
192 * Legacy WDS vap setup.
193 */
194 /*
195 * The far end does not associate so we just create
196 * create a new node and install it as the vap's
197 * bss node. We must simulate an association and
198 * authorize the port for traffic to flow.
199 * XXX check if node already in sta table?
200 */
201 ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan);
202 if (ni != NULL) {
203 obss = vap->iv_update_bss(vap, 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
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, IEEE80211_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 MPASS((mcopy->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
301 mcopy->m_pkthdr.rcvif = (void *) ni;
302
303 err = ieee80211_parent_xmitpkt(ic, mcopy);
304 IEEE80211_TX_UNLOCK(ic);
305 if (!err) {
306 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
307 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
308 if_inc_counter(ifp, IFCOUNTER_OBYTES,
309 m->m_pkthdr.len);
310 }
311 }
312 }
313
314 /*
315 * Handle DWDS discovery on receipt of a 4-address frame in
316 * ap mode. Queue the frame and post an event for someone
317 * to plumb the necessary WDS vap for this station. Frames
318 * received prior to the vap set running will then be reprocessed
319 * as if they were just received.
320 */
321 void
322 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m)
323 {
324 struct ieee80211com *ic = ni->ni_ic;
325
326 /*
327 * Save the frame with an aging interval 4 times
328 * the listen interval specified by the station.
329 * Frames that sit around too long are reclaimed
330 * using this information.
331 * XXX handle overflow?
332 * XXX per/vap beacon interval?
333 */
334 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
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_DATA;
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 || IEEE80211_IS_PROTECTED(wh)) {
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_DATA)
587 qos = ieee80211_getqos(wh)[0];
588 else
589 qos = 0;
590
591 /*
592 * Next up, any fragmentation.
593 */
594 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
595 m = ieee80211_defrag(ni, m, hdrspace, has_decrypted);
596 if (m == NULL) {
597 /* Fragment dropped or frame not complete yet */
598 goto out;
599 }
600 }
601 wh = NULL; /* no longer valid, catch any uses */
602
603 /*
604 * Next strip any MSDU crypto bits.
605 */
606 if (!ieee80211_crypto_demic(vap, key, m, 0)) {
607 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
608 ni->ni_macaddr, "data", "%s", "demic error");
609 vap->iv_stats.is_rx_demicfail++;
610 IEEE80211_NODE_STAT(ni, rx_demicfail);
611 goto out;
612 }
613
614 /* copy to listener after decrypt */
615 if (ieee80211_radiotap_active_vap(vap))
616 ieee80211_radiotap_rx(vap, m);
617 need_tap = 0;
618
619 /*
620 * Finally, strip the 802.11 header.
621 */
622 m = ieee80211_decap(vap, m, hdrspace, qos);
623 if (m == NULL) {
624 /* XXX mask bit to check for both */
625 /* don't count Null data frames as errors */
626 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
627 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
628 goto out;
629 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
630 ni->ni_macaddr, "data", "%s", "decap error");
631 vap->iv_stats.is_rx_decap++;
632 IEEE80211_NODE_STAT(ni, rx_decap);
633 goto err;
634 }
635 if (!(qos & IEEE80211_QOS_AMSDU))
636 eh = mtod(m, struct ether_header *);
637 else
638 eh = NULL;
639 if (!ieee80211_node_is_authorized(ni)) {
640 /*
641 * Deny any non-PAE frames received prior to
642 * authorization. For open/shared-key
643 * authentication the port is mark authorized
644 * after authentication completes. For 802.1x
645 * the port is not marked authorized by the
646 * authenticator until the handshake has completed.
647 */
648 if (eh == NULL ||
649 eh->ether_type != htons(ETHERTYPE_PAE)) {
650 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
651 ni->ni_macaddr, "data", "unauthorized or "
652 "unknown port: ether type 0x%x len %u",
653 eh == NULL ? -1 : eh->ether_type,
654 m->m_pkthdr.len);
655 vap->iv_stats.is_rx_unauth++;
656 IEEE80211_NODE_STAT(ni, rx_unauth);
657 goto err;
658 }
659 } else {
660 /*
661 * When denying unencrypted frames, discard
662 * any non-PAE frames received without encryption.
663 */
664 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
665 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
666 (is_hw_decrypted == 0) &&
667 (eh == NULL ||
668 eh->ether_type != htons(ETHERTYPE_PAE))) {
669 /*
670 * Drop unencrypted frames.
671 */
672 vap->iv_stats.is_rx_unencrypted++;
673 IEEE80211_NODE_STAT(ni, rx_unencrypted);
674 goto out;
675 }
676 }
677 /* XXX require HT? */
678 if (qos & IEEE80211_QOS_AMSDU) {
679 m = ieee80211_decap_amsdu(ni, m);
680 if (m == NULL)
681 return IEEE80211_FC0_TYPE_DATA;
682 } else {
683 #ifdef IEEE80211_SUPPORT_SUPERG
684 m = ieee80211_decap_fastframe(vap, ni, m);
685 if (m == NULL)
686 return IEEE80211_FC0_TYPE_DATA;
687 #endif
688 }
689 ieee80211_deliver_data(vap, ni, m);
690 return IEEE80211_FC0_TYPE_DATA;
691
692 case IEEE80211_FC0_TYPE_MGT:
693 vap->iv_stats.is_rx_mgmt++;
694 IEEE80211_NODE_STAT(ni, rx_mgmt);
695 if (dir != IEEE80211_FC1_DIR_NODS) {
696 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
697 wh, "data", "incorrect dir 0x%x", dir);
698 vap->iv_stats.is_rx_wrongdir++;
699 goto err;
700 }
701 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
702 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
703 ni->ni_macaddr, "mgt", "too short: len %u",
704 m->m_pkthdr.len);
705 vap->iv_stats.is_rx_tooshort++;
706 goto out;
707 }
708 #ifdef IEEE80211_DEBUG
709 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) {
710 if_printf(ifp, "received %s from %s rssi %d\n",
711 ieee80211_mgt_subtype_name(subtype),
712 ether_sprintf(wh->i_addr2), rssi);
713 }
714 #endif
715 if (IEEE80211_IS_PROTECTED(wh)) {
716 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
717 wh, NULL, "%s", "WEP set but not permitted");
718 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
719 goto out;
720 }
721 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
722 goto out;
723
724 case IEEE80211_FC0_TYPE_CTL:
725 vap->iv_stats.is_rx_ctl++;
726 IEEE80211_NODE_STAT(ni, rx_ctrl);
727 goto out;
728
729 default:
730 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
731 wh, "bad", "frame type 0x%x", type);
732 /* should not come here */
733 break;
734 }
735 err:
736 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
737 out:
738 if (m != NULL) {
739 if (need_tap && ieee80211_radiotap_active_vap(vap))
740 ieee80211_radiotap_rx(vap, m);
741 m_freem(m);
742 }
743 return type;
744 }
745
746 static void
747 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
748 const struct ieee80211_rx_stats *rxs, int rssi, int nf)
749 {
750 struct ieee80211vap *vap = ni->ni_vap;
751 struct ieee80211com *ic = ni->ni_ic;
752 struct ieee80211_frame *wh;
753 u_int8_t *frm, *efrm;
754
755 wh = mtod(m0, struct ieee80211_frame *);
756 frm = (u_int8_t *)&wh[1];
757 efrm = mtod(m0, u_int8_t *) + m0->m_len;
758 switch (subtype) {
759 case IEEE80211_FC0_SUBTYPE_ACTION:
760 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
761 if (ni == vap->iv_bss) {
762 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
763 wh, NULL, "%s", "unknown node");
764 vap->iv_stats.is_rx_mgtdiscard++;
765 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) {
766 /* NB: not interested in multicast frames. */
767 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
768 wh, NULL, "%s", "not for us");
769 vap->iv_stats.is_rx_mgtdiscard++;
770 } else if (vap->iv_state != IEEE80211_S_RUN) {
771 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
772 wh, NULL, "wrong state %s",
773 ieee80211_state_name[vap->iv_state]);
774 vap->iv_stats.is_rx_mgtdiscard++;
775 } else {
776 if (ieee80211_parse_action(ni, m0) == 0)
777 (void)ic->ic_recv_action(ni, wh, frm, efrm);
778 }
779 break;
780
781 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
782 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
783 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
784 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
785 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
786 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
787 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
788 case IEEE80211_FC0_SUBTYPE_BEACON:
789 case IEEE80211_FC0_SUBTYPE_ATIM:
790 case IEEE80211_FC0_SUBTYPE_DISASSOC:
791 case IEEE80211_FC0_SUBTYPE_AUTH:
792 case IEEE80211_FC0_SUBTYPE_DEAUTH:
793 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
794 wh, NULL, "%s", "not handled");
795 vap->iv_stats.is_rx_mgtdiscard++;
796 break;
797
798 default:
799 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
800 wh, "mgt", "subtype 0x%x not handled", subtype);
801 vap->iv_stats.is_rx_badsubtype++;
802 break;
803 }
804 }
Cache object: 3fc3bad9be8014eb3b31b8940875a31c
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