1 /*-
2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include <sys/cdefs.h>
27 #ifdef __FreeBSD__
28 __FBSDID("$FreeBSD: releng/10.0/sys/net80211/ieee80211_wds.c 254082 2013-08-08 05:09:35Z adrian $");
29 #endif
30
31 /*
32 * IEEE 802.11 WDS mode support.
33 */
34 #include "opt_inet.h"
35 #include "opt_wlan.h"
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/mbuf.h>
40 #include <sys/malloc.h>
41 #include <sys/kernel.h>
42
43 #include <sys/socket.h>
44 #include <sys/sockio.h>
45 #include <sys/endian.h>
46 #include <sys/errno.h>
47 #include <sys/proc.h>
48 #include <sys/sysctl.h>
49
50 #include <net/if.h>
51 #include <net/if_media.h>
52 #include <net/if_llc.h>
53 #include <net/ethernet.h>
54
55 #include <net/bpf.h>
56
57 #include <net80211/ieee80211_var.h>
58 #include <net80211/ieee80211_wds.h>
59 #include <net80211/ieee80211_input.h>
60 #ifdef IEEE80211_SUPPORT_SUPERG
61 #include <net80211/ieee80211_superg.h>
62 #endif
63
64 static void wds_vattach(struct ieee80211vap *);
65 static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int);
66 static int wds_input(struct ieee80211_node *ni, struct mbuf *m, int, int);
67 static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *,
68 int subtype, int, int);
69
70 void
71 ieee80211_wds_attach(struct ieee80211com *ic)
72 {
73 ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach;
74 }
75
76 void
77 ieee80211_wds_detach(struct ieee80211com *ic)
78 {
79 }
80
81 static void
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
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
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
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_bss;
179 vap->iv_bss = ni;
180 ni->ni_wdsvap = vap;
181 }
182 IEEE80211_NODE_UNLOCK(nt);
183 if (obss != NULL) {
184 /* NB: deferred to avoid recursive lock */
185 ieee80211_free_node(obss);
186 }
187 } else {
188 /*
189 * Legacy WDS vap setup.
190 */
191 /*
192 * The far end does not associate so we just create
193 * create a new node and install it as the vap's
194 * bss node. We must simulate an association and
195 * authorize the port for traffic to flow.
196 * XXX check if node already in sta table?
197 */
198 ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan);
199 if (ni != NULL) {
200 obss = vap->iv_bss;
201 vap->iv_bss = ieee80211_ref_node(ni);
202 ni->ni_flags |= IEEE80211_NODE_AREF;
203 if (obss != NULL)
204 ieee80211_free_node(obss);
205 /* give driver a chance to setup state like ni_txrate */
206 if (ic->ic_newassoc != NULL)
207 ic->ic_newassoc(ni, 1);
208 /* tell the authenticator about new station */
209 if (vap->iv_auth->ia_node_join != NULL)
210 vap->iv_auth->ia_node_join(ni);
211 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
212 ieee80211_node_authorize(ni);
213
214 ieee80211_notify_node_join(ni, 1 /*newassoc*/);
215 /* XXX inject l2uf frame */
216 }
217 }
218
219 /*
220 * Flush any pending frames now that were setup.
221 */
222 if (ni != NULL)
223 wds_flush(ni);
224 return (ni == NULL ? ENOENT : 0);
225 }
226
227 /*
228 * Propagate multicast frames of an ap vap to all DWDS links.
229 * The caller is assumed to have verified this frame is multicast.
230 */
231 void
232 ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m)
233 {
234 struct ieee80211com *ic = vap0->iv_ic;
235 const struct ether_header *eh = mtod(m, const struct ether_header *);
236 struct ieee80211_node *ni;
237 struct ieee80211vap *vap;
238 struct ifnet *ifp;
239 struct mbuf *mcopy;
240 int err;
241
242 KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost),
243 ("%s not mcast", ether_sprintf(eh->ether_dhost)));
244
245 /* XXX locking */
246 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
247 /* only DWDS vaps are interesting */
248 if (vap->iv_opmode != IEEE80211_M_WDS ||
249 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))
250 continue;
251 /* if it came in this interface, don't send it back out */
252 ifp = vap->iv_ifp;
253 if (ifp == m->m_pkthdr.rcvif)
254 continue;
255 /*
256 * Duplicate the frame and send it.
257 */
258 mcopy = m_copypacket(m, M_NOWAIT);
259 if (mcopy == NULL) {
260 ifp->if_oerrors++;
261 /* XXX stat + msg */
262 continue;
263 }
264 ni = ieee80211_find_txnode(vap, eh->ether_dhost);
265 if (ni == NULL) {
266 /* NB: ieee80211_find_txnode does stat+msg */
267 ifp->if_oerrors++;
268 m_freem(mcopy);
269 continue;
270 }
271 /* calculate priority so drivers can find the tx queue */
272 if (ieee80211_classify(ni, mcopy)) {
273 IEEE80211_DISCARD_MAC(vap,
274 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS,
275 eh->ether_dhost, NULL,
276 "%s", "classification failure");
277 vap->iv_stats.is_tx_classify++;
278 ifp->if_oerrors++;
279 m_freem(mcopy);
280 ieee80211_free_node(ni);
281 continue;
282 }
283
284 BPF_MTAP(ifp, m); /* 802.3 tx */
285
286 /*
287 * Encapsulate the packet in prep for transmission.
288 */
289 mcopy = ieee80211_encap(vap, ni, mcopy);
290 if (mcopy == NULL) {
291 /* NB: stat+msg handled in ieee80211_encap */
292 ieee80211_free_node(ni);
293 continue;
294 }
295 mcopy->m_flags |= M_MCAST;
296 mcopy->m_pkthdr.rcvif = (void *) ni;
297
298 err = ieee80211_parent_xmitpkt(ic, mcopy);
299 if (err) {
300 /* NB: IFQ_HANDOFF reclaims mbuf */
301 ifp->if_oerrors++;
302 ieee80211_free_node(ni);
303 } else
304 ifp->if_opackets++;
305 }
306 }
307
308 /*
309 * Handle DWDS discovery on receipt of a 4-address frame in
310 * ap mode. Queue the frame and post an event for someone
311 * to plumb the necessary WDS vap for this station. Frames
312 * received prior to the vap set running will then be reprocessed
313 * as if they were just received.
314 */
315 void
316 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m)
317 {
318 struct ieee80211com *ic = ni->ni_ic;
319
320 /*
321 * Save the frame with an aging interval 4 times
322 * the listen interval specified by the station.
323 * Frames that sit around too long are reclaimed
324 * using this information.
325 * XXX handle overflow?
326 * XXX per/vap beacon interval?
327 */
328 m->m_pkthdr.rcvif = (void *)(uintptr_t)
329 ieee80211_mac_hash(ic, ni->ni_macaddr);
330 (void) ieee80211_ageq_append(&ic->ic_stageq, m,
331 ((ni->ni_intval * ic->ic_lintval) << 2) / 1024);
332 ieee80211_notify_wds_discover(ni);
333 }
334
335 /*
336 * IEEE80211_M_WDS vap state machine handler.
337 */
338 static int
339 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
340 {
341 struct ieee80211com *ic = vap->iv_ic;
342 struct ieee80211_node *ni;
343 enum ieee80211_state ostate;
344 int error;
345
346 IEEE80211_LOCK_ASSERT(ic);
347
348 ostate = vap->iv_state;
349 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__,
350 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
351 vap->iv_state = nstate; /* state transition */
352 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */
353 if (ostate != IEEE80211_S_SCAN)
354 ieee80211_cancel_scan(vap); /* background scan */
355 ni = vap->iv_bss; /* NB: no reference held */
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
406 wds_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
407 {
408 #define HAS_SEQ(type) ((type & 0x4) == 0)
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 uint16_t rxseq;
418
419 if (m->m_flags & M_AMPDU_MPDU) {
420 /*
421 * Fastpath for A-MPDU reorder q resubmission. Frames
422 * w/ M_AMPDU_MPDU marked have already passed through
423 * here but were received out of order and been held on
424 * the reorder queue. When resubmitted they are marked
425 * with the M_AMPDU_MPDU flag and we can bypass most of
426 * the normal processing.
427 */
428 wh = mtod(m, struct ieee80211_frame *);
429 type = IEEE80211_FC0_TYPE_DATA;
430 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
431 subtype = IEEE80211_FC0_SUBTYPE_QOS;
432 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
433 goto resubmit_ampdu;
434 }
435
436 KASSERT(ni != NULL, ("null node"));
437
438 type = -1; /* undefined */
439
440 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
441 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
442 ni->ni_macaddr, NULL,
443 "too short (1): len %u", m->m_pkthdr.len);
444 vap->iv_stats.is_rx_tooshort++;
445 goto out;
446 }
447 /*
448 * Bit of a cheat here, we use a pointer for a 3-address
449 * frame format but don't reference fields past outside
450 * ieee80211_frame_min w/o first validating the data is
451 * present.
452 */
453 wh = mtod(m, struct ieee80211_frame *);
454
455 if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
456 ni->ni_inact = ni->ni_inact_reload;
457
458 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
459 IEEE80211_FC0_VERSION_0) {
460 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
461 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
462 wh->i_fc[0], wh->i_fc[1]);
463 vap->iv_stats.is_rx_badversion++;
464 goto err;
465 }
466
467 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
468 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
469 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
470
471 /* NB: WDS vap's do not scan */
472 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) {
473 IEEE80211_DISCARD_MAC(vap,
474 IEEE80211_MSG_ANY, ni->ni_macaddr, NULL,
475 "too short (3): len %u", m->m_pkthdr.len);
476 vap->iv_stats.is_rx_tooshort++;
477 goto out;
478 }
479 /* NB: the TA is implicitly verified by finding the wds peer node */
480 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) &&
481 !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) {
482 /* not interested in */
483 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
484 wh->i_addr1, NULL, "%s", "not to bss");
485 vap->iv_stats.is_rx_wrongbss++;
486 goto out;
487 }
488 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
489 ni->ni_noise = nf;
490 if (HAS_SEQ(type)) {
491 uint8_t tid = ieee80211_gettid(wh);
492 if (IEEE80211_QOS_HAS_SEQ(wh) &&
493 TID_TO_WME_AC(tid) >= WME_AC_VI)
494 ic->ic_wme.wme_hipri_traffic++;
495 rxseq = le16toh(*(uint16_t *)wh->i_seq);
496 if (! ieee80211_check_rxseq(ni, wh)) {
497 /* duplicate, discard */
498 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
499 wh->i_addr1, "duplicate",
500 "seqno <%u,%u> fragno <%u,%u> tid %u",
501 rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
502 ni->ni_rxseqs[tid] >> IEEE80211_SEQ_SEQ_SHIFT,
503 rxseq & IEEE80211_SEQ_FRAG_MASK,
504 ni->ni_rxseqs[tid] & IEEE80211_SEQ_FRAG_MASK,
505 tid);
506 vap->iv_stats.is_rx_dup++;
507 IEEE80211_NODE_STAT(ni, rx_dup);
508 goto out;
509 }
510 ni->ni_rxseqs[tid] = rxseq;
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) != 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 (wh->i_fc[1] & IEEE80211_FC1_WEP) {
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 key = ieee80211_crypto_decap(ni, m, hdrspace);
571 if (key == NULL) {
572 /* NB: stats+msgs handled in crypto_decap */
573 IEEE80211_NODE_STAT(ni, rx_wepfail);
574 goto out;
575 }
576 wh = mtod(m, struct ieee80211_frame *);
577 wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
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 (key != NULL && !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 (key == NULL && (m->m_flags & M_WEP) == 0) &&
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 if_printf(ifp, "received %s from %s rssi %d\n",
706 ieee80211_mgt_subtype_name[subtype >>
707 IEEE80211_FC0_SUBTYPE_SHIFT],
708 ether_sprintf(wh->i_addr2), rssi);
709 }
710 #endif
711 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
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, 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 ifp->if_ierrors++;
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,
744 int subtype, 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_BEACON:
784 case IEEE80211_FC0_SUBTYPE_ATIM:
785 case IEEE80211_FC0_SUBTYPE_DISASSOC:
786 case IEEE80211_FC0_SUBTYPE_AUTH:
787 case IEEE80211_FC0_SUBTYPE_DEAUTH:
788 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
789 wh, NULL, "%s", "not handled");
790 vap->iv_stats.is_rx_mgtdiscard++;
791 break;
792
793 default:
794 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
795 wh, "mgt", "subtype 0x%x not handled", subtype);
796 vap->iv_stats.is_rx_badsubtype++;
797 break;
798 }
799 }
Cache object: 82e214c6a10a58ac5d81d78a8ec18946
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