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/8.2/sys/net80211/ieee80211_wds.c 215621 2010-11-21 11:03:22Z bschmidt $");
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 struct ifnet *parent = ic->ic_ifp;
236 const struct ether_header *eh = mtod(m, const struct ether_header *);
237 struct ieee80211_node *ni;
238 struct ieee80211vap *vap;
239 struct ifnet *ifp;
240 struct mbuf *mcopy;
241 int err;
242
243 KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost),
244 ("%s not mcast", ether_sprintf(eh->ether_dhost)));
245
246 /* XXX locking */
247 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
248 /* only DWDS vaps are interesting */
249 if (vap->iv_opmode != IEEE80211_M_WDS ||
250 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))
251 continue;
252 /* if it came in this interface, don't send it back out */
253 ifp = vap->iv_ifp;
254 if (ifp == m->m_pkthdr.rcvif)
255 continue;
256 /*
257 * Duplicate the frame and send it.
258 */
259 mcopy = m_copypacket(m, M_DONTWAIT);
260 if (mcopy == NULL) {
261 ifp->if_oerrors++;
262 /* XXX stat + msg */
263 continue;
264 }
265 ni = ieee80211_find_txnode(vap, eh->ether_dhost);
266 if (ni == NULL) {
267 /* NB: ieee80211_find_txnode does stat+msg */
268 ifp->if_oerrors++;
269 m_freem(mcopy);
270 continue;
271 }
272 /* calculate priority so drivers can find the tx queue */
273 if (ieee80211_classify(ni, mcopy)) {
274 IEEE80211_DISCARD_MAC(vap,
275 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS,
276 eh->ether_dhost, NULL,
277 "%s", "classification failure");
278 vap->iv_stats.is_tx_classify++;
279 ifp->if_oerrors++;
280 m_freem(mcopy);
281 ieee80211_free_node(ni);
282 continue;
283 }
284
285 BPF_MTAP(ifp, m); /* 802.3 tx */
286
287 /*
288 * Encapsulate the packet in prep for transmission.
289 */
290 mcopy = ieee80211_encap(vap, ni, mcopy);
291 if (mcopy == NULL) {
292 /* NB: stat+msg handled in ieee80211_encap */
293 ieee80211_free_node(ni);
294 continue;
295 }
296 mcopy->m_flags |= M_MCAST;
297 mcopy->m_pkthdr.rcvif = (void *) ni;
298
299 err = parent->if_transmit(parent, mcopy);
300 if (err) {
301 /* NB: IFQ_HANDOFF reclaims mbuf */
302 ifp->if_oerrors++;
303 ieee80211_free_node(ni);
304 } else
305 ifp->if_opackets++;
306 }
307 }
308
309 /*
310 * Handle DWDS discovery on receipt of a 4-address frame in
311 * ap mode. Queue the frame and post an event for someone
312 * to plumb the necessary WDS vap for this station. Frames
313 * received prior to the vap set running will then be reprocessed
314 * as if they were just received.
315 */
316 void
317 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m)
318 {
319 struct ieee80211com *ic = ni->ni_ic;
320
321 /*
322 * Save the frame with an aging interval 4 times
323 * the listen interval specified by the station.
324 * Frames that sit around too long are reclaimed
325 * using this information.
326 * XXX handle overflow?
327 * XXX per/vap beacon interval?
328 */
329 m->m_pkthdr.rcvif = (void *)(uintptr_t)
330 ieee80211_mac_hash(ic, ni->ni_macaddr);
331 (void) ieee80211_ageq_append(&ic->ic_stageq, m,
332 ((ni->ni_intval * ic->ic_lintval) << 2) / 1024);
333 ieee80211_notify_wds_discover(ni);
334 }
335
336 /*
337 * IEEE80211_M_WDS vap state machine handler.
338 */
339 static int
340 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
341 {
342 struct ieee80211com *ic = vap->iv_ic;
343 struct ieee80211_node *ni;
344 enum ieee80211_state ostate;
345 int error;
346
347 IEEE80211_LOCK_ASSERT(ic);
348
349 ostate = vap->iv_state;
350 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__,
351 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
352 vap->iv_state = nstate; /* state transition */
353 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */
354 if (ostate != IEEE80211_S_SCAN)
355 ieee80211_cancel_scan(vap); /* background scan */
356 ni = vap->iv_bss; /* NB: no reference held */
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
407 wds_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
408 {
409 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
410 #define HAS_SEQ(type) ((type & 0x4) == 0)
411 struct ieee80211vap *vap = ni->ni_vap;
412 struct ieee80211com *ic = ni->ni_ic;
413 struct ifnet *ifp = vap->iv_ifp;
414 struct ieee80211_frame *wh;
415 struct ieee80211_key *key;
416 struct ether_header *eh;
417 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
418 uint8_t dir, type, subtype, qos;
419 uint16_t rxseq;
420
421 if (m->m_flags & M_AMPDU_MPDU) {
422 /*
423 * Fastpath for A-MPDU reorder q resubmission. Frames
424 * w/ M_AMPDU_MPDU marked have already passed through
425 * here but were received out of order and been held on
426 * the reorder queue. When resubmitted they are marked
427 * with the M_AMPDU_MPDU flag and we can bypass most of
428 * the normal processing.
429 */
430 wh = mtod(m, struct ieee80211_frame *);
431 type = IEEE80211_FC0_TYPE_DATA;
432 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
433 subtype = IEEE80211_FC0_SUBTYPE_QOS;
434 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
435 goto resubmit_ampdu;
436 }
437
438 KASSERT(ni != NULL, ("null node"));
439
440 type = -1; /* undefined */
441
442 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
443 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
444 ni->ni_macaddr, NULL,
445 "too short (1): len %u", m->m_pkthdr.len);
446 vap->iv_stats.is_rx_tooshort++;
447 goto out;
448 }
449 /*
450 * Bit of a cheat here, we use a pointer for a 3-address
451 * frame format but don't reference fields past outside
452 * ieee80211_frame_min w/o first validating the data is
453 * present.
454 */
455 wh = mtod(m, struct ieee80211_frame *);
456
457 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
458 IEEE80211_FC0_VERSION_0) {
459 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
460 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
461 wh->i_fc[0], wh->i_fc[1]);
462 vap->iv_stats.is_rx_badversion++;
463 goto err;
464 }
465
466 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
467 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
468 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
469
470 /* NB: WDS vap's do not scan */
471 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) {
472 IEEE80211_DISCARD_MAC(vap,
473 IEEE80211_MSG_ANY, ni->ni_macaddr, NULL,
474 "too short (3): len %u", m->m_pkthdr.len);
475 vap->iv_stats.is_rx_tooshort++;
476 goto out;
477 }
478 /* NB: the TA is implicitly verified by finding the wds peer node */
479 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) &&
480 !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) {
481 /* not interested in */
482 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
483 wh->i_addr1, NULL, "%s", "not to bss");
484 vap->iv_stats.is_rx_wrongbss++;
485 goto out;
486 }
487 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
488 ni->ni_noise = nf;
489 if (HAS_SEQ(type)) {
490 uint8_t tid = ieee80211_gettid(wh);
491 if (IEEE80211_QOS_HAS_SEQ(wh) &&
492 TID_TO_WME_AC(tid) >= WME_AC_VI)
493 ic->ic_wme.wme_hipri_traffic++;
494 rxseq = le16toh(*(uint16_t *)wh->i_seq);
495 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
496 (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
497 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
498 /* duplicate, discard */
499 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
500 wh->i_addr1, "duplicate",
501 "seqno <%u,%u> fragno <%u,%u> tid %u",
502 rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
503 ni->ni_rxseqs[tid] >> IEEE80211_SEQ_SEQ_SHIFT,
504 rxseq & IEEE80211_SEQ_FRAG_MASK,
505 ni->ni_rxseqs[tid] & IEEE80211_SEQ_FRAG_MASK,
506 tid);
507 vap->iv_stats.is_rx_dup++;
508 IEEE80211_NODE_STAT(ni, rx_dup);
509 goto out;
510 }
511 ni->ni_rxseqs[tid] = rxseq;
512 }
513 switch (type) {
514 case IEEE80211_FC0_TYPE_DATA:
515 hdrspace = ieee80211_hdrspace(ic, wh);
516 if (m->m_len < hdrspace &&
517 (m = m_pullup(m, hdrspace)) == NULL) {
518 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
519 ni->ni_macaddr, NULL,
520 "data too short: expecting %u", hdrspace);
521 vap->iv_stats.is_rx_tooshort++;
522 goto out; /* XXX */
523 }
524 if (dir != IEEE80211_FC1_DIR_DSTODS) {
525 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
526 wh, "data", "incorrect dir 0x%x", dir);
527 vap->iv_stats.is_rx_wrongdir++;
528 goto out;
529 }
530 /*
531 * Only legacy WDS traffic should take this path.
532 */
533 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
534 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
535 wh, "data", "%s", "not legacy wds");
536 vap->iv_stats.is_rx_wrongdir++;/*XXX*/
537 goto out;
538 }
539 if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
540 ni->ni_inact = ni->ni_inact_reload;
541 /*
542 * Handle A-MPDU re-ordering. If the frame is to be
543 * processed directly then ieee80211_ampdu_reorder
544 * will return 0; otherwise it has consumed the mbuf
545 * and we should do nothing more with it.
546 */
547 if ((m->m_flags & M_AMPDU) &&
548 ieee80211_ampdu_reorder(ni, m) != 0) {
549 m = NULL;
550 goto out;
551 }
552 resubmit_ampdu:
553
554 /*
555 * Handle privacy requirements. Note that we
556 * must not be preempted from here until after
557 * we (potentially) call ieee80211_crypto_demic;
558 * otherwise we may violate assumptions in the
559 * crypto cipher modules used to do delayed update
560 * of replay sequence numbers.
561 */
562 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
563 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
564 /*
565 * Discard encrypted frames when privacy is off.
566 */
567 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
568 wh, "WEP", "%s", "PRIVACY off");
569 vap->iv_stats.is_rx_noprivacy++;
570 IEEE80211_NODE_STAT(ni, rx_noprivacy);
571 goto out;
572 }
573 key = ieee80211_crypto_decap(ni, m, hdrspace);
574 if (key == NULL) {
575 /* NB: stats+msgs handled in crypto_decap */
576 IEEE80211_NODE_STAT(ni, rx_wepfail);
577 goto out;
578 }
579 wh = mtod(m, struct ieee80211_frame *);
580 wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
581 } else {
582 /* XXX M_WEP and IEEE80211_F_PRIVACY */
583 key = NULL;
584 }
585
586 /*
587 * Save QoS bits for use below--before we strip the header.
588 */
589 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
590 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
591 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
592 ((struct ieee80211_qosframe *)wh)->i_qos[0];
593 } else
594 qos = 0;
595
596 /*
597 * Next up, any fragmentation.
598 */
599 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
600 m = ieee80211_defrag(ni, m, hdrspace);
601 if (m == NULL) {
602 /* Fragment dropped or frame not complete yet */
603 goto out;
604 }
605 }
606 wh = NULL; /* no longer valid, catch any uses */
607
608 /*
609 * Next strip any MSDU crypto bits.
610 */
611 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
612 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
613 ni->ni_macaddr, "data", "%s", "demic error");
614 vap->iv_stats.is_rx_demicfail++;
615 IEEE80211_NODE_STAT(ni, rx_demicfail);
616 goto out;
617 }
618
619 /* copy to listener after decrypt */
620 if (ieee80211_radiotap_active_vap(vap))
621 ieee80211_radiotap_rx(vap, m);
622 need_tap = 0;
623
624 /*
625 * Finally, strip the 802.11 header.
626 */
627 m = ieee80211_decap(vap, m, hdrspace);
628 if (m == NULL) {
629 /* XXX mask bit to check for both */
630 /* don't count Null data frames as errors */
631 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
632 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
633 goto out;
634 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
635 ni->ni_macaddr, "data", "%s", "decap error");
636 vap->iv_stats.is_rx_decap++;
637 IEEE80211_NODE_STAT(ni, rx_decap);
638 goto err;
639 }
640 eh = mtod(m, struct ether_header *);
641 if (!ieee80211_node_is_authorized(ni)) {
642 /*
643 * Deny any non-PAE frames received prior to
644 * authorization. For open/shared-key
645 * authentication the port is mark authorized
646 * after authentication completes. For 802.1x
647 * the port is not marked authorized by the
648 * authenticator until the handshake has completed.
649 */
650 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
651 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
652 eh->ether_shost, "data",
653 "unauthorized port: ether type 0x%x len %u",
654 eh->ether_type, 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 (key == NULL && (m->m_flags & M_WEP) == 0) &&
666 eh->ether_type != htons(ETHERTYPE_PAE)) {
667 /*
668 * Drop unencrypted frames.
669 */
670 vap->iv_stats.is_rx_unencrypted++;
671 IEEE80211_NODE_STAT(ni, rx_unencrypted);
672 goto out;
673 }
674 }
675 /* XXX require HT? */
676 if (qos & IEEE80211_QOS_AMSDU) {
677 m = ieee80211_decap_amsdu(ni, m);
678 if (m == NULL)
679 return IEEE80211_FC0_TYPE_DATA;
680 } else {
681 #ifdef IEEE80211_SUPPORT_SUPERG
682 m = ieee80211_decap_fastframe(vap, ni, m);
683 if (m == NULL)
684 return IEEE80211_FC0_TYPE_DATA;
685 #endif
686 }
687 ieee80211_deliver_data(vap, ni, m);
688 return IEEE80211_FC0_TYPE_DATA;
689
690 case IEEE80211_FC0_TYPE_MGT:
691 vap->iv_stats.is_rx_mgmt++;
692 IEEE80211_NODE_STAT(ni, rx_mgmt);
693 if (dir != IEEE80211_FC1_DIR_NODS) {
694 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
695 wh, "data", "incorrect dir 0x%x", dir);
696 vap->iv_stats.is_rx_wrongdir++;
697 goto err;
698 }
699 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
700 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
701 ni->ni_macaddr, "mgt", "too short: len %u",
702 m->m_pkthdr.len);
703 vap->iv_stats.is_rx_tooshort++;
704 goto out;
705 }
706 #ifdef IEEE80211_DEBUG
707 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) {
708 if_printf(ifp, "received %s from %s rssi %d\n",
709 ieee80211_mgt_subtype_name[subtype >>
710 IEEE80211_FC0_SUBTYPE_SHIFT],
711 ether_sprintf(wh->i_addr2), rssi);
712 }
713 #endif
714 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
715 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
716 wh, NULL, "%s", "WEP set but not permitted");
717 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
718 goto out;
719 }
720 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
721 goto out;
722
723 case IEEE80211_FC0_TYPE_CTL:
724 vap->iv_stats.is_rx_ctl++;
725 IEEE80211_NODE_STAT(ni, rx_ctrl);
726 goto out;
727
728 default:
729 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
730 wh, "bad", "frame type 0x%x", type);
731 /* should not come here */
732 break;
733 }
734 err:
735 ifp->if_ierrors++;
736 out:
737 if (m != NULL) {
738 if (need_tap && ieee80211_radiotap_active_vap(vap))
739 ieee80211_radiotap_rx(vap, m);
740 m_freem(m);
741 }
742 return type;
743 #undef SEQ_LEQ
744 }
745
746 static void
747 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
748 int subtype, 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_DEAUTH:
760 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
761 case IEEE80211_FC0_SUBTYPE_BEACON:
762 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
763 case IEEE80211_FC0_SUBTYPE_AUTH:
764 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
765 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
766 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
767 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
768 case IEEE80211_FC0_SUBTYPE_DISASSOC:
769 vap->iv_stats.is_rx_mgtdiscard++;
770 break;
771 case IEEE80211_FC0_SUBTYPE_ACTION:
772 if (vap->iv_state != IEEE80211_S_RUN ||
773 IEEE80211_IS_MULTICAST(wh->i_addr1)) {
774 vap->iv_stats.is_rx_mgtdiscard++;
775 break;
776 }
777 ni->ni_inact = ni->ni_inact_reload;
778 if (ieee80211_parse_action(ni, m0) == 0)
779 ic->ic_recv_action(ni, wh, frm, efrm);
780 break;
781 default:
782 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
783 wh, "mgt", "subtype 0x%x not handled", subtype);
784 vap->iv_stats.is_rx_badsubtype++;
785 break;
786 }
787 }
Cache object: 30ff9da9ba53d743fa9da0b10dc8a552
|