1 /*-
2 * Copyright (c) 2001 Atsushi Onoe
3 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: src/sys/net80211/ieee80211_input.c,v 1.120 2008/10/25 23:26:57 sam Exp $");
29
30 #include "opt_wlan.h"
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/mbuf.h>
35 #include <sys/malloc.h>
36 #include <sys/endian.h>
37 #include <sys/kernel.h>
38
39 #include <sys/socket.h>
40
41 #include <net/ethernet.h>
42 #include <net/if.h>
43 #include <net/if_llc.h>
44 #include <net/if_media.h>
45 #include <net/if_vlan_var.h>
46
47 #include <net80211/ieee80211_var.h>
48 #include <net80211/ieee80211_input.h>
49
50 #include <net/bpf.h>
51
52 #ifdef INET
53 #include <netinet/in.h>
54 #include <net/ethernet.h>
55 #endif
56
57 int
58 ieee80211_input_all(struct ieee80211com *ic,
59 struct mbuf *m, int rssi, int noise, u_int32_t rstamp)
60 {
61 struct ieee80211vap *vap;
62 int type = -1;
63
64 /* XXX locking */
65 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
66 struct ieee80211_node *ni;
67 struct mbuf *mcopy;
68
69 /*
70 * WDS vap's only receive directed traffic from the
71 * station at the ``far end''. That traffic should
72 * be passed through the AP vap the station is associated
73 * to--so don't spam them with mcast frames.
74 */
75 if (vap->iv_opmode == IEEE80211_M_WDS)
76 continue;
77 if (TAILQ_NEXT(vap, iv_next) != NULL) {
78 /*
79 * Packet contents are changed by ieee80211_decap
80 * so do a deep copy of the packet.
81 */
82 mcopy = m_dup(m, M_DONTWAIT);
83 if (mcopy == NULL) {
84 /* XXX stat+msg */
85 continue;
86 }
87 } else {
88 mcopy = m;
89 m = NULL;
90 }
91 ni = ieee80211_ref_node(vap->iv_bss);
92 type = ieee80211_input(ni, mcopy, rssi, noise, rstamp);
93 ieee80211_free_node(ni);
94 }
95 if (m != NULL) /* no vaps, reclaim mbuf */
96 m_freem(m);
97 return type;
98 }
99
100 /*
101 * This function reassemble fragments.
102 *
103 * XXX should handle 3 concurrent reassemblies per-spec.
104 */
105 struct mbuf *
106 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace)
107 {
108 struct ieee80211vap *vap = ni->ni_vap;
109 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
110 struct ieee80211_frame *lwh;
111 uint16_t rxseq;
112 uint8_t fragno;
113 uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG;
114 struct mbuf *mfrag;
115
116 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?"));
117
118 rxseq = le16toh(*(uint16_t *)wh->i_seq);
119 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK;
120
121 /* Quick way out, if there's nothing to defragment */
122 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL)
123 return m;
124
125 /*
126 * Remove frag to insure it doesn't get reaped by timer.
127 */
128 if (ni->ni_table == NULL) {
129 /*
130 * Should never happen. If the node is orphaned (not in
131 * the table) then input packets should not reach here.
132 * Otherwise, a concurrent request that yanks the table
133 * should be blocked by other interlocking and/or by first
134 * shutting the driver down. Regardless, be defensive
135 * here and just bail
136 */
137 /* XXX need msg+stat */
138 m_freem(m);
139 return NULL;
140 }
141 IEEE80211_NODE_LOCK(ni->ni_table);
142 mfrag = ni->ni_rxfrag[0];
143 ni->ni_rxfrag[0] = NULL;
144 IEEE80211_NODE_UNLOCK(ni->ni_table);
145
146 /*
147 * Validate new fragment is in order and
148 * related to the previous ones.
149 */
150 if (mfrag != NULL) {
151 uint16_t last_rxseq;
152
153 lwh = mtod(mfrag, struct ieee80211_frame *);
154 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq);
155 /* NB: check seq # and frag together */
156 if (rxseq != last_rxseq+1 ||
157 !IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) ||
158 !IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) {
159 /*
160 * Unrelated fragment or no space for it,
161 * clear current fragments.
162 */
163 m_freem(mfrag);
164 mfrag = NULL;
165 }
166 }
167
168 if (mfrag == NULL) {
169 if (fragno != 0) { /* !first fragment, discard */
170 vap->iv_stats.is_rx_defrag++;
171 IEEE80211_NODE_STAT(ni, rx_defrag);
172 m_freem(m);
173 return NULL;
174 }
175 mfrag = m;
176 } else { /* concatenate */
177 m_adj(m, hdrspace); /* strip header */
178 m_cat(mfrag, m);
179 /* NB: m_cat doesn't update the packet header */
180 mfrag->m_pkthdr.len += m->m_pkthdr.len;
181 /* track last seqnum and fragno */
182 lwh = mtod(mfrag, struct ieee80211_frame *);
183 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq;
184 }
185 if (more_frag) { /* more to come, save */
186 ni->ni_rxfragstamp = ticks;
187 ni->ni_rxfrag[0] = mfrag;
188 mfrag = NULL;
189 }
190 return mfrag;
191 }
192
193 void
194 ieee80211_deliver_data(struct ieee80211vap *vap,
195 struct ieee80211_node *ni, struct mbuf *m)
196 {
197 struct ether_header *eh = mtod(m, struct ether_header *);
198 struct ifnet *ifp = vap->iv_ifp;
199
200 /* NB: see hostap_deliver_data, this path doesn't handle hostap */
201 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap"));
202 /*
203 * Do accounting.
204 */
205 ifp->if_ipackets++;
206 IEEE80211_NODE_STAT(ni, rx_data);
207 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
208 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
209 m->m_flags |= M_MCAST; /* XXX M_BCAST? */
210 IEEE80211_NODE_STAT(ni, rx_mcast);
211 } else
212 IEEE80211_NODE_STAT(ni, rx_ucast);
213 m->m_pkthdr.rcvif = ifp;
214
215 /* clear driver/net80211 flags before passing up */
216 m->m_flags &= ~M_80211_RX;
217
218 if (ni->ni_vlan != 0) {
219 /* attach vlan tag */
220 m->m_pkthdr.ether_vtag = ni->ni_vlan;
221 m->m_flags |= M_VLANTAG;
222 }
223 ifp->if_input(ifp, m);
224 }
225
226 struct mbuf *
227 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen)
228 {
229 struct ieee80211_qosframe_addr4 wh; /* Max size address frames */
230 struct ether_header *eh;
231 struct llc *llc;
232
233 if (m->m_len < hdrlen + sizeof(*llc) &&
234 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) {
235 /* XXX stat, msg */
236 return NULL;
237 }
238 memcpy(&wh, mtod(m, caddr_t), hdrlen);
239 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen);
240 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP &&
241 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 &&
242 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 &&
243 /* NB: preserve AppleTalk frames that have a native SNAP hdr */
244 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) ||
245 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) {
246 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh));
247 llc = NULL;
248 } else {
249 m_adj(m, hdrlen - sizeof(*eh));
250 }
251 eh = mtod(m, struct ether_header *);
252 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) {
253 case IEEE80211_FC1_DIR_NODS:
254 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
255 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
256 break;
257 case IEEE80211_FC1_DIR_TODS:
258 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
259 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
260 break;
261 case IEEE80211_FC1_DIR_FROMDS:
262 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
263 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3);
264 break;
265 case IEEE80211_FC1_DIR_DSTODS:
266 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
267 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4);
268 break;
269 }
270 #ifdef ALIGNED_POINTER
271 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) {
272 struct mbuf *n, *n0, **np;
273 caddr_t newdata;
274 int off, pktlen;
275
276 n0 = NULL;
277 np = &n0;
278 off = 0;
279 pktlen = m->m_pkthdr.len;
280 while (pktlen > off) {
281 if (n0 == NULL) {
282 MGETHDR(n, M_DONTWAIT, MT_DATA);
283 if (n == NULL) {
284 m_freem(m);
285 return NULL;
286 }
287 M_MOVE_PKTHDR(n, m);
288 n->m_len = MHLEN;
289 } else {
290 MGET(n, M_DONTWAIT, MT_DATA);
291 if (n == NULL) {
292 m_freem(m);
293 m_freem(n0);
294 return NULL;
295 }
296 n->m_len = MLEN;
297 }
298 if (pktlen - off >= MINCLSIZE) {
299 MCLGET(n, M_DONTWAIT);
300 if (n->m_flags & M_EXT)
301 n->m_len = n->m_ext.ext_size;
302 }
303 if (n0 == NULL) {
304 newdata =
305 (caddr_t)ALIGN(n->m_data + sizeof(*eh)) -
306 sizeof(*eh);
307 n->m_len -= newdata - n->m_data;
308 n->m_data = newdata;
309 }
310 if (n->m_len > pktlen - off)
311 n->m_len = pktlen - off;
312 m_copydata(m, off, n->m_len, mtod(n, caddr_t));
313 off += n->m_len;
314 *np = n;
315 np = &n->m_next;
316 }
317 m_freem(m);
318 m = n0;
319 }
320 #endif /* ALIGNED_POINTER */
321 if (llc != NULL) {
322 eh = mtod(m, struct ether_header *);
323 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh));
324 }
325 return m;
326 }
327
328 /*
329 * Decap a frame encapsulated in a fast-frame/A-MSDU.
330 */
331 struct mbuf *
332 ieee80211_decap1(struct mbuf *m, int *framelen)
333 {
334 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc))
335 struct ether_header *eh;
336 struct llc *llc;
337
338 /*
339 * The frame has an 802.3 header followed by an 802.2
340 * LLC header. The encapsulated frame length is in the
341 * first header type field; save that and overwrite it
342 * with the true type field found in the second. Then
343 * copy the 802.3 header up to where it belongs and
344 * adjust the mbuf contents to remove the void.
345 */
346 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL)
347 return NULL;
348 eh = mtod(m, struct ether_header *); /* 802.3 header is first */
349 llc = (struct llc *)&eh[1]; /* 802.2 header follows */
350 *framelen = ntohs(eh->ether_type) /* encap'd frame size */
351 + sizeof(struct ether_header) - sizeof(struct llc);
352 eh->ether_type = llc->llc_un.type_snap.ether_type;
353 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc),
354 sizeof(struct ether_header));
355 m_adj(m, sizeof(struct llc));
356 return m;
357 #undef FF_LLC_SIZE
358 }
359
360 /*
361 * Decap the encapsulated frame pair and dispatch the first
362 * for delivery. The second frame is returned for delivery
363 * via the normal path.
364 */
365 struct mbuf *
366 ieee80211_decap_fastframe(struct ieee80211_node *ni, struct mbuf *m)
367 {
368 #define MS(x,f) (((x) & f) >> f##_S)
369 struct ieee80211vap *vap = ni->ni_vap;
370 uint32_t ath;
371 struct mbuf *n;
372 int framelen;
373
374 m_copydata(m, 0, sizeof(uint32_t), (caddr_t) &ath);
375 if (MS(ath, ATH_FF_PROTO) != ATH_FF_PROTO_L2TUNNEL) {
376 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
377 ni->ni_macaddr, "fast-frame",
378 "unsupport tunnel protocol, header 0x%x", ath);
379 vap->iv_stats.is_ff_badhdr++;
380 m_freem(m);
381 return NULL;
382 }
383 /* NB: skip header and alignment padding */
384 m_adj(m, roundup(sizeof(uint32_t) - 2, 4) + 2);
385
386 vap->iv_stats.is_ff_decap++;
387
388 /*
389 * Decap the first frame, bust it apart from the
390 * second and deliver; then decap the second frame
391 * and return it to the caller for normal delivery.
392 */
393 m = ieee80211_decap1(m, &framelen);
394 if (m == NULL) {
395 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
396 ni->ni_macaddr, "fast-frame", "%s", "first decap failed");
397 vap->iv_stats.is_ff_tooshort++;
398 return NULL;
399 }
400 n = m_split(m, framelen, M_NOWAIT);
401 if (n == NULL) {
402 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
403 ni->ni_macaddr, "fast-frame",
404 "%s", "unable to split encapsulated frames");
405 vap->iv_stats.is_ff_split++;
406 m_freem(m); /* NB: must reclaim */
407 return NULL;
408 }
409 /* XXX not right for WDS */
410 vap->iv_deliver_data(vap, ni, m); /* 1st of pair */
411
412 /*
413 * Decap second frame.
414 */
415 m_adj(n, roundup2(framelen, 4) - framelen); /* padding */
416 n = ieee80211_decap1(n, &framelen);
417 if (n == NULL) {
418 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
419 ni->ni_macaddr, "fast-frame", "%s", "second decap failed");
420 vap->iv_stats.is_ff_tooshort++;
421 }
422 /* XXX verify framelen against mbuf contents */
423 return n; /* 2nd delivered by caller */
424 #undef MS
425 }
426
427 /*
428 * Install received rate set information in the node's state block.
429 */
430 int
431 ieee80211_setup_rates(struct ieee80211_node *ni,
432 const uint8_t *rates, const uint8_t *xrates, int flags)
433 {
434 struct ieee80211vap *vap = ni->ni_vap;
435 struct ieee80211_rateset *rs = &ni->ni_rates;
436
437 memset(rs, 0, sizeof(*rs));
438 rs->rs_nrates = rates[1];
439 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates);
440 if (xrates != NULL) {
441 uint8_t nxrates;
442 /*
443 * Tack on 11g extended supported rate element.
444 */
445 nxrates = xrates[1];
446 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) {
447 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates;
448 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni,
449 "extended rate set too large; only using "
450 "%u of %u rates", nxrates, xrates[1]);
451 vap->iv_stats.is_rx_rstoobig++;
452 }
453 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates);
454 rs->rs_nrates += nxrates;
455 }
456 return ieee80211_fix_rate(ni, rs, flags);
457 }
458
459 /*
460 * Send a management frame error response to the specified
461 * station. If ni is associated with the station then use
462 * it; otherwise allocate a temporary node suitable for
463 * transmitting the frame and then free the reference so
464 * it will go away as soon as the frame has been transmitted.
465 */
466 void
467 ieee80211_send_error(struct ieee80211_node *ni,
468 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg)
469 {
470 struct ieee80211vap *vap = ni->ni_vap;
471 int istmp;
472
473 if (ni == vap->iv_bss) {
474 if (vap->iv_state != IEEE80211_S_RUN) {
475 /*
476 * XXX hack until we get rid of this routine.
477 * We can be called prior to the vap reaching
478 * run state under certain conditions in which
479 * case iv_bss->ni_chan will not be setup.
480 * Check for this explicitly and and just ignore
481 * the request.
482 */
483 return;
484 }
485 ni = ieee80211_tmp_node(vap, mac);
486 if (ni == NULL) {
487 /* XXX msg */
488 return;
489 }
490 istmp = 1;
491 } else
492 istmp = 0;
493 IEEE80211_SEND_MGMT(ni, subtype, arg);
494 if (istmp)
495 ieee80211_free_node(ni);
496 }
497
498 int
499 ieee80211_alloc_challenge(struct ieee80211_node *ni)
500 {
501 if (ni->ni_challenge == NULL)
502 MALLOC(ni->ni_challenge, uint32_t*, IEEE80211_CHALLENGE_LEN,
503 M_80211_NODE, M_NOWAIT);
504 if (ni->ni_challenge == NULL) {
505 IEEE80211_NOTE(ni->ni_vap,
506 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni,
507 "%s", "shared key challenge alloc failed");
508 /* XXX statistic */
509 }
510 return (ni->ni_challenge != NULL);
511 }
512
513 void
514 ieee80211_parse_ath(struct ieee80211_node *ni, uint8_t *ie)
515 {
516 const struct ieee80211_ath_ie *ath =
517 (const struct ieee80211_ath_ie *) ie;
518
519 ni->ni_ath_flags = ath->ath_capability;
520 ni->ni_ath_defkeyix = LE_READ_2(&ath->ath_defkeyix);
521 }
522
523 /*
524 * Parse a Beacon or ProbeResponse frame and return the
525 * useful information in an ieee80211_scanparams structure.
526 * Status is set to 0 if no problems were found; otherwise
527 * a bitmask of IEEE80211_BPARSE_* items is returned that
528 * describes the problems detected.
529 */
530 int
531 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m,
532 struct ieee80211_scanparams *scan)
533 {
534 struct ieee80211vap *vap = ni->ni_vap;
535 struct ieee80211com *ic = ni->ni_ic;
536 struct ieee80211_frame *wh;
537 uint8_t *frm, *efrm;
538
539 wh = mtod(m, struct ieee80211_frame *);
540 frm = (uint8_t *)&wh[1];
541 efrm = mtod(m, uint8_t *) + m->m_len;
542 scan->status = 0;
543 /*
544 * beacon/probe response frame format
545 * [8] time stamp
546 * [2] beacon interval
547 * [2] capability information
548 * [tlv] ssid
549 * [tlv] supported rates
550 * [tlv] country information
551 * [tlv] parameter set (FH/DS)
552 * [tlv] erp information
553 * [tlv] extended supported rates
554 * [tlv] WME
555 * [tlv] WPA or RSN
556 * [tlv] HT capabilities
557 * [tlv] HT information
558 * [tlv] Atheros capabilities
559 */
560 IEEE80211_VERIFY_LENGTH(efrm - frm, 12,
561 return (scan->status = IEEE80211_BPARSE_BADIELEN));
562 memset(scan, 0, sizeof(*scan));
563 scan->tstamp = frm; frm += 8;
564 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2;
565 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2;
566 scan->bchan = ieee80211_chan2ieee(ic, ic->ic_curchan);
567 scan->chan = scan->bchan;
568 scan->ies = frm;
569 scan->ies_len = efrm - frm;
570
571 while (efrm - frm > 1) {
572 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2,
573 return (scan->status = IEEE80211_BPARSE_BADIELEN));
574 switch (*frm) {
575 case IEEE80211_ELEMID_SSID:
576 scan->ssid = frm;
577 break;
578 case IEEE80211_ELEMID_RATES:
579 scan->rates = frm;
580 break;
581 case IEEE80211_ELEMID_COUNTRY:
582 scan->country = frm;
583 break;
584 case IEEE80211_ELEMID_FHPARMS:
585 if (ic->ic_phytype == IEEE80211_T_FH) {
586 scan->fhdwell = LE_READ_2(&frm[2]);
587 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]);
588 scan->fhindex = frm[6];
589 }
590 break;
591 case IEEE80211_ELEMID_DSPARMS:
592 /*
593 * XXX hack this since depending on phytype
594 * is problematic for multi-mode devices.
595 */
596 if (ic->ic_phytype != IEEE80211_T_FH)
597 scan->chan = frm[2];
598 break;
599 case IEEE80211_ELEMID_TIM:
600 /* XXX ATIM? */
601 scan->tim = frm;
602 scan->timoff = frm - mtod(m, uint8_t *);
603 break;
604 case IEEE80211_ELEMID_IBSSPARMS:
605 case IEEE80211_ELEMID_CFPARMS:
606 case IEEE80211_ELEMID_PWRCNSTR:
607 /* NB: avoid debugging complaints */
608 break;
609 case IEEE80211_ELEMID_XRATES:
610 scan->xrates = frm;
611 break;
612 case IEEE80211_ELEMID_ERP:
613 if (frm[1] != 1) {
614 IEEE80211_DISCARD_IE(vap,
615 IEEE80211_MSG_ELEMID, wh, "ERP",
616 "bad len %u", frm[1]);
617 vap->iv_stats.is_rx_elem_toobig++;
618 break;
619 }
620 scan->erp = frm[2] | 0x100;
621 break;
622 case IEEE80211_ELEMID_HTCAP:
623 scan->htcap = frm;
624 break;
625 case IEEE80211_ELEMID_RSN:
626 scan->rsn = frm;
627 break;
628 case IEEE80211_ELEMID_HTINFO:
629 scan->htinfo = frm;
630 break;
631 case IEEE80211_ELEMID_VENDOR:
632 if (iswpaoui(frm))
633 scan->wpa = frm;
634 else if (iswmeparam(frm) || iswmeinfo(frm))
635 scan->wme = frm;
636 else if (isatherosoui(frm))
637 scan->ath = frm;
638 else if (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) {
639 /*
640 * Accept pre-draft HT ie's if the
641 * standard ones have not been seen.
642 */
643 if (ishtcapoui(frm)) {
644 if (scan->htcap == NULL)
645 scan->htcap = frm;
646 } else if (ishtinfooui(frm)) {
647 if (scan->htinfo == NULL)
648 scan->htcap = frm;
649 }
650 }
651 break;
652 default:
653 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID,
654 wh, "unhandled",
655 "id %u, len %u", *frm, frm[1]);
656 vap->iv_stats.is_rx_elem_unknown++;
657 break;
658 }
659 frm += frm[1] + 2;
660 }
661 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE,
662 scan->status |= IEEE80211_BPARSE_RATES_INVALID);
663 if (scan->rates != NULL && scan->xrates != NULL) {
664 /*
665 * NB: don't process XRATES if RATES is missing. This
666 * avoids a potential null ptr deref and should be ok
667 * as the return code will already note RATES is missing
668 * (so callers shouldn't otherwise process the frame).
669 */
670 IEEE80211_VERIFY_ELEMENT(scan->xrates,
671 IEEE80211_RATE_MAXSIZE - scan->rates[1],
672 scan->status |= IEEE80211_BPARSE_XRATES_INVALID);
673 }
674 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN,
675 scan->status |= IEEE80211_BPARSE_SSID_INVALID);
676 #if IEEE80211_CHAN_MAX < 255
677 if (scan->chan > IEEE80211_CHAN_MAX) {
678 IEEE80211_DISCARD(vap, IEEE80211_MSG_ELEMID,
679 wh, NULL, "invalid channel %u", scan->chan);
680 vap->iv_stats.is_rx_badchan++;
681 scan->status |= IEEE80211_BPARSE_CHAN_INVALID;
682 }
683 #endif
684 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) {
685 /*
686 * Frame was received on a channel different from the
687 * one indicated in the DS params element id;
688 * silently discard it.
689 *
690 * NB: this can happen due to signal leakage.
691 * But we should take it for FH phy because
692 * the rssi value should be correct even for
693 * different hop pattern in FH.
694 */
695 IEEE80211_DISCARD(vap,
696 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
697 wh, NULL, "for off-channel %u", scan->chan);
698 vap->iv_stats.is_rx_chanmismatch++;
699 scan->status |= IEEE80211_BPARSE_OFFCHAN;
700 }
701 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval &&
702 scan->bintval <= IEEE80211_BINTVAL_MAX)) {
703 IEEE80211_DISCARD(vap,
704 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
705 wh, NULL, "bogus beacon interval", scan->bintval);
706 vap->iv_stats.is_rx_badbintval++;
707 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID;
708 }
709 if (scan->country != NULL) {
710 /*
711 * Validate we have at least enough data to extract
712 * the country code. Not sure if we should return an
713 * error instead of discarding the IE; consider this
714 * being lenient as we don't depend on the data for
715 * correct operation.
716 */
717 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t),
718 scan->country = NULL);
719 }
720 /*
721 * Process HT ie's. This is complicated by our
722 * accepting both the standard ie's and the pre-draft
723 * vendor OUI ie's that some vendors still use/require.
724 */
725 if (scan->htcap != NULL) {
726 IEEE80211_VERIFY_LENGTH(scan->htcap[1],
727 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ?
728 4 + sizeof(struct ieee80211_ie_htcap)-2 :
729 sizeof(struct ieee80211_ie_htcap)-2,
730 scan->htcap = NULL);
731 }
732 if (scan->htinfo != NULL) {
733 IEEE80211_VERIFY_LENGTH(scan->htinfo[1],
734 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ?
735 4 + sizeof(struct ieee80211_ie_htinfo)-2 :
736 sizeof(struct ieee80211_ie_htinfo)-2,
737 scan->htinfo = NULL);
738 }
739 return scan->status;
740 }
741
742 /*
743 * Parse an Action frame. Return 0 on success, non-zero on failure.
744 */
745 int
746 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m)
747 {
748 struct ieee80211vap *vap = ni->ni_vap;
749 const struct ieee80211_action *ia;
750 struct ieee80211_frame *wh;
751 uint8_t *frm, *efrm;
752
753 /*
754 * action frame format:
755 * [1] category
756 * [1] action
757 * [tlv] parameters
758 */
759 wh = mtod(m, struct ieee80211_frame *);
760 frm = (u_int8_t *)&wh[1];
761 efrm = mtod(m, u_int8_t *) + m->m_len;
762 IEEE80211_VERIFY_LENGTH(efrm - frm,
763 sizeof(struct ieee80211_action), return EINVAL);
764 ia = (const struct ieee80211_action *) frm;
765
766 vap->iv_stats.is_rx_action++;
767 IEEE80211_NODE_STAT(ni, rx_action);
768
769 /* verify frame payloads but defer processing */
770 /* XXX maybe push this to method */
771 switch (ia->ia_category) {
772 case IEEE80211_ACTION_CAT_BA:
773 switch (ia->ia_action) {
774 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
775 IEEE80211_VERIFY_LENGTH(efrm - frm,
776 sizeof(struct ieee80211_action_ba_addbarequest),
777 return EINVAL);
778 break;
779 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
780 IEEE80211_VERIFY_LENGTH(efrm - frm,
781 sizeof(struct ieee80211_action_ba_addbaresponse),
782 return EINVAL);
783 break;
784 case IEEE80211_ACTION_BA_DELBA:
785 IEEE80211_VERIFY_LENGTH(efrm - frm,
786 sizeof(struct ieee80211_action_ba_delba),
787 return EINVAL);
788 break;
789 }
790 break;
791 case IEEE80211_ACTION_CAT_HT:
792 switch (ia->ia_action) {
793 case IEEE80211_ACTION_HT_TXCHWIDTH:
794 IEEE80211_VERIFY_LENGTH(efrm - frm,
795 sizeof(struct ieee80211_action_ht_txchwidth),
796 return EINVAL);
797 break;
798 case IEEE80211_ACTION_HT_MIMOPWRSAVE:
799 IEEE80211_VERIFY_LENGTH(efrm - frm,
800 sizeof(struct ieee80211_action_ht_mimopowersave),
801 return EINVAL);
802 break;
803 }
804 break;
805 }
806 return 0;
807 }
808
809 #ifdef IEEE80211_DEBUG
810 /*
811 * Debugging support.
812 */
813 void
814 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag,
815 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid)
816 {
817 printf("[%s] discard %s frame, ssid mismatch: ",
818 ether_sprintf(mac), tag);
819 ieee80211_print_essid(ssid + 2, ssid[1]);
820 printf("\n");
821 }
822
823 /*
824 * Return the bssid of a frame.
825 */
826 static const uint8_t *
827 ieee80211_getbssid(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
828 {
829 if (vap->iv_opmode == IEEE80211_M_STA)
830 return wh->i_addr2;
831 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS)
832 return wh->i_addr1;
833 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL)
834 return wh->i_addr1;
835 return wh->i_addr3;
836 }
837
838 #include <machine/stdarg.h>
839
840 void
841 ieee80211_note(struct ieee80211vap *vap, const char *fmt, ...)
842 {
843 char buf[128]; /* XXX */
844 va_list ap;
845
846 va_start(ap, fmt);
847 vsnprintf(buf, sizeof(buf), fmt, ap);
848 va_end(ap);
849
850 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */
851 }
852
853 void
854 ieee80211_note_frame(struct ieee80211vap *vap,
855 const struct ieee80211_frame *wh,
856 const char *fmt, ...)
857 {
858 char buf[128]; /* XXX */
859 va_list ap;
860
861 va_start(ap, fmt);
862 vsnprintf(buf, sizeof(buf), fmt, ap);
863 va_end(ap);
864 if_printf(vap->iv_ifp, "[%s] %s\n",
865 ether_sprintf(ieee80211_getbssid(vap, wh)), buf);
866 }
867
868 void
869 ieee80211_note_mac(struct ieee80211vap *vap,
870 const uint8_t mac[IEEE80211_ADDR_LEN],
871 const char *fmt, ...)
872 {
873 char buf[128]; /* XXX */
874 va_list ap;
875
876 va_start(ap, fmt);
877 vsnprintf(buf, sizeof(buf), fmt, ap);
878 va_end(ap);
879 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf);
880 }
881
882 void
883 ieee80211_discard_frame(struct ieee80211vap *vap,
884 const struct ieee80211_frame *wh,
885 const char *type, const char *fmt, ...)
886 {
887 va_list ap;
888
889 if_printf(vap->iv_ifp, "[%s] discard ",
890 ether_sprintf(ieee80211_getbssid(vap, wh)));
891 if (type == NULL) {
892 printf("%s frame, ", ieee80211_mgt_subtype_name[
893 (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) >>
894 IEEE80211_FC0_SUBTYPE_SHIFT]);
895 } else
896 printf("%s frame, ", type);
897 va_start(ap, fmt);
898 vprintf(fmt, ap);
899 va_end(ap);
900 printf("\n");
901 }
902
903 void
904 ieee80211_discard_ie(struct ieee80211vap *vap,
905 const struct ieee80211_frame *wh,
906 const char *type, const char *fmt, ...)
907 {
908 va_list ap;
909
910 if_printf(vap->iv_ifp, "[%s] discard ",
911 ether_sprintf(ieee80211_getbssid(vap, wh)));
912 if (type != NULL)
913 printf("%s |