1 /*-
2 * Copyright (c) 2001 Atsushi Onoe
3 * Copyright (c) 2002-2009 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: releng/9.0/sys/net80211/ieee80211_input.c 220445 2011-04-08 09:20:45Z adrian $");
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 #ifdef IEEE80211_SUPPORT_MESH
50 #include <net80211/ieee80211_mesh.h>
51 #endif
52
53 #include <net/bpf.h>
54
55 #ifdef INET
56 #include <netinet/in.h>
57 #include <net/ethernet.h>
58 #endif
59
60 static void
61 ieee80211_process_mimo(struct ieee80211_node *ni, struct ieee80211_rx_stats *rx)
62 {
63 int i;
64
65 /* Verify the required MIMO bits are set */
66 if ((rx->r_flags & (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI)) !=
67 (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI))
68 return;
69
70 /* XXX This assumes the MIMO radios have both ctl and ext chains */
71 for (i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) {
72 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ctl[i], rx->c_rssi_ctl[i]);
73 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ext[i], rx->c_rssi_ext[i]);
74 }
75
76 /* XXX This also assumes the MIMO radios have both ctl and ext chains */
77 for(i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) {
78 ni->ni_mimo_noise_ctl[i] = rx->c_nf_ctl[i];
79 ni->ni_mimo_noise_ext[i] = rx->c_nf_ext[i];
80 }
81 ni->ni_mimo_chains = rx->c_chain;
82 }
83
84 int
85 ieee80211_input_mimo(struct ieee80211_node *ni, struct mbuf *m,
86 struct ieee80211_rx_stats *rx)
87 {
88 /* XXX should assert IEEE80211_R_NF and IEEE80211_R_RSSI are set */
89 ieee80211_process_mimo(ni, rx);
90 return ieee80211_input(ni, m, rx->rssi, rx->nf);
91 }
92
93 int
94 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf)
95 {
96 struct ieee80211_rx_stats rx;
97
98 rx.r_flags = IEEE80211_R_NF | IEEE80211_R_RSSI;
99 rx.nf = nf;
100 rx.rssi = rssi;
101 return ieee80211_input_mimo_all(ic, m, &rx);
102 }
103
104 int
105 ieee80211_input_mimo_all(struct ieee80211com *ic, struct mbuf *m,
106 struct ieee80211_rx_stats *rx)
107 {
108 struct ieee80211vap *vap;
109 int type = -1;
110
111 m->m_flags |= M_BCAST; /* NB: mark for bpf tap'ing */
112
113 /* XXX locking */
114 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
115 struct ieee80211_node *ni;
116 struct mbuf *mcopy;
117
118 /* NB: could check for IFF_UP but this is cheaper */
119 if (vap->iv_state == IEEE80211_S_INIT)
120 continue;
121 /*
122 * WDS vap's only receive directed traffic from the
123 * station at the ``far end''. That traffic should
124 * be passed through the AP vap the station is associated
125 * to--so don't spam them with mcast frames.
126 */
127 if (vap->iv_opmode == IEEE80211_M_WDS)
128 continue;
129 if (TAILQ_NEXT(vap, iv_next) != NULL) {
130 /*
131 * Packet contents are changed by ieee80211_decap
132 * so do a deep copy of the packet.
133 */
134 mcopy = m_dup(m, M_DONTWAIT);
135 if (mcopy == NULL) {
136 /* XXX stat+msg */
137 continue;
138 }
139 } else {
140 mcopy = m;
141 m = NULL;
142 }
143 ni = ieee80211_ref_node(vap->iv_bss);
144 type = ieee80211_input_mimo(ni, mcopy, rx);
145 ieee80211_free_node(ni);
146 }
147 if (m != NULL) /* no vaps, reclaim mbuf */
148 m_freem(m);
149 return type;
150 }
151
152 /*
153 * This function reassembles fragments.
154 *
155 * XXX should handle 3 concurrent reassemblies per-spec.
156 */
157 struct mbuf *
158 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace)
159 {
160 struct ieee80211vap *vap = ni->ni_vap;
161 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
162 struct ieee80211_frame *lwh;
163 uint16_t rxseq;
164 uint8_t fragno;
165 uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG;
166 struct mbuf *mfrag;
167
168 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?"));
169
170 rxseq = le16toh(*(uint16_t *)wh->i_seq);
171 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK;
172
173 /* Quick way out, if there's nothing to defragment */
174 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL)
175 return m;
176
177 /*
178 * Remove frag to insure it doesn't get reaped by timer.
179 */
180 if (ni->ni_table == NULL) {
181 /*
182 * Should never happen. If the node is orphaned (not in
183 * the table) then input packets should not reach here.
184 * Otherwise, a concurrent request that yanks the table
185 * should be blocked by other interlocking and/or by first
186 * shutting the driver down. Regardless, be defensive
187 * here and just bail
188 */
189 /* XXX need msg+stat */
190 m_freem(m);
191 return NULL;
192 }
193 IEEE80211_NODE_LOCK(ni->ni_table);
194 mfrag = ni->ni_rxfrag[0];
195 ni->ni_rxfrag[0] = NULL;
196 IEEE80211_NODE_UNLOCK(ni->ni_table);
197
198 /*
199 * Validate new fragment is in order and
200 * related to the previous ones.
201 */
202 if (mfrag != NULL) {
203 uint16_t last_rxseq;
204
205 lwh = mtod(mfrag, struct ieee80211_frame *);
206 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq);
207 /* NB: check seq # and frag together */
208 if (rxseq != last_rxseq+1 ||
209 !IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) ||
210 !IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) {
211 /*
212 * Unrelated fragment or no space for it,
213 * clear current fragments.
214 */
215 m_freem(mfrag);
216 mfrag = NULL;
217 }
218 }
219
220 if (mfrag == NULL) {
221 if (fragno != 0) { /* !first fragment, discard */
222 vap->iv_stats.is_rx_defrag++;
223 IEEE80211_NODE_STAT(ni, rx_defrag);
224 m_freem(m);
225 return NULL;
226 }
227 mfrag = m;
228 } else { /* concatenate */
229 m_adj(m, hdrspace); /* strip header */
230 m_cat(mfrag, m);
231 /* NB: m_cat doesn't update the packet header */
232 mfrag->m_pkthdr.len += m->m_pkthdr.len;
233 /* track last seqnum and fragno */
234 lwh = mtod(mfrag, struct ieee80211_frame *);
235 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq;
236 }
237 if (more_frag) { /* more to come, save */
238 ni->ni_rxfragstamp = ticks;
239 ni->ni_rxfrag[0] = mfrag;
240 mfrag = NULL;
241 }
242 return mfrag;
243 }
244
245 void
246 ieee80211_deliver_data(struct ieee80211vap *vap,
247 struct ieee80211_node *ni, struct mbuf *m)
248 {
249 struct ether_header *eh = mtod(m, struct ether_header *);
250 struct ifnet *ifp = vap->iv_ifp;
251
252 /* clear driver/net80211 flags before passing up */
253 m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST);
254
255 /* NB: see hostap_deliver_data, this path doesn't handle hostap */
256 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap"));
257 /*
258 * Do accounting.
259 */
260 ifp->if_ipackets++;
261 IEEE80211_NODE_STAT(ni, rx_data);
262 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
263 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
264 m->m_flags |= M_MCAST; /* XXX M_BCAST? */
265 IEEE80211_NODE_STAT(ni, rx_mcast);
266 } else
267 IEEE80211_NODE_STAT(ni, rx_ucast);
268 m->m_pkthdr.rcvif = ifp;
269
270 if (ni->ni_vlan != 0) {
271 /* attach vlan tag */
272 m->m_pkthdr.ether_vtag = ni->ni_vlan;
273 m->m_flags |= M_VLANTAG;
274 }
275 ifp->if_input(ifp, m);
276 }
277
278 struct mbuf *
279 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen)
280 {
281 struct ieee80211_qosframe_addr4 wh;
282 struct ether_header *eh;
283 struct llc *llc;
284
285 KASSERT(hdrlen <= sizeof(wh),
286 ("hdrlen %d > max %zd", hdrlen, sizeof(wh)));
287
288 if (m->m_len < hdrlen + sizeof(*llc) &&
289 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) {
290 vap->iv_stats.is_rx_tooshort++;
291 /* XXX msg */
292 return NULL;
293 }
294 memcpy(&wh, mtod(m, caddr_t), hdrlen);
295 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen);
296 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP &&
297 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 &&
298 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 &&
299 /* NB: preserve AppleTalk frames that have a native SNAP hdr */
300 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) ||
301 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) {
302 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh));
303 llc = NULL;
304 } else {
305 m_adj(m, hdrlen - sizeof(*eh));
306 }
307 eh = mtod(m, struct ether_header *);
308 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) {
309 case IEEE80211_FC1_DIR_NODS:
310 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
311 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
312 break;
313 case IEEE80211_FC1_DIR_TODS:
314 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
315 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
316 break;
317 case IEEE80211_FC1_DIR_FROMDS:
318 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
319 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3);
320 break;
321 case IEEE80211_FC1_DIR_DSTODS:
322 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
323 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4);
324 break;
325 }
326 #ifdef ALIGNED_POINTER
327 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) {
328 m = ieee80211_realign(vap, m, sizeof(*eh));
329 if (m == NULL)
330 return NULL;
331 }
332 #endif /* ALIGNED_POINTER */
333 if (llc != NULL) {
334 eh = mtod(m, struct ether_header *);
335 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh));
336 }
337 return m;
338 }
339
340 /*
341 * Decap a frame encapsulated in a fast-frame/A-MSDU.
342 */
343 struct mbuf *
344 ieee80211_decap1(struct mbuf *m, int *framelen)
345 {
346 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc))
347 struct ether_header *eh;
348 struct llc *llc;
349
350 /*
351 * The frame has an 802.3 header followed by an 802.2
352 * LLC header. The encapsulated frame length is in the
353 * first header type field; save that and overwrite it
354 * with the true type field found in the second. Then
355 * copy the 802.3 header up to where it belongs and
356 * adjust the mbuf contents to remove the void.
357 */
358 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL)
359 return NULL;
360 eh = mtod(m, struct ether_header *); /* 802.3 header is first */
361 llc = (struct llc *)&eh[1]; /* 802.2 header follows */
362 *framelen = ntohs(eh->ether_type) /* encap'd frame size */
363 + sizeof(struct ether_header) - sizeof(struct llc);
364 eh->ether_type = llc->llc_un.type_snap.ether_type;
365 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc),
366 sizeof(struct ether_header));
367 m_adj(m, sizeof(struct llc));
368 return m;
369 #undef FF_LLC_SIZE
370 }
371
372 /*
373 * Install received rate set information in the node's state block.
374 */
375 int
376 ieee80211_setup_rates(struct ieee80211_node *ni,
377 const uint8_t *rates, const uint8_t *xrates, int flags)
378 {
379 struct ieee80211vap *vap = ni->ni_vap;
380 struct ieee80211_rateset *rs = &ni->ni_rates;
381
382 memset(rs, 0, sizeof(*rs));
383 rs->rs_nrates = rates[1];
384 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates);
385 if (xrates != NULL) {
386 uint8_t nxrates;
387 /*
388 * Tack on 11g extended supported rate element.
389 */
390 nxrates = xrates[1];
391 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) {
392 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates;
393 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni,
394 "extended rate set too large; only using "
395 "%u of %u rates", nxrates, xrates[1]);
396 vap->iv_stats.is_rx_rstoobig++;
397 }
398 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates);
399 rs->rs_nrates += nxrates;
400 }
401 return ieee80211_fix_rate(ni, rs, flags);
402 }
403
404 /*
405 * Send a management frame error response to the specified
406 * station. If ni is associated with the station then use
407 * it; otherwise allocate a temporary node suitable for
408 * transmitting the frame and then free the reference so
409 * it will go away as soon as the frame has been transmitted.
410 */
411 void
412 ieee80211_send_error(struct ieee80211_node *ni,
413 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg)
414 {
415 struct ieee80211vap *vap = ni->ni_vap;
416 int istmp;
417
418 if (ni == vap->iv_bss) {
419 if (vap->iv_state != IEEE80211_S_RUN) {
420 /*
421 * XXX hack until we get rid of this routine.
422 * We can be called prior to the vap reaching
423 * run state under certain conditions in which
424 * case iv_bss->ni_chan will not be setup.
425 * Check for this explicitly and and just ignore
426 * the request.
427 */
428 return;
429 }
430 ni = ieee80211_tmp_node(vap, mac);
431 if (ni == NULL) {
432 /* XXX msg */
433 return;
434 }
435 istmp = 1;
436 } else
437 istmp = 0;
438 IEEE80211_SEND_MGMT(ni, subtype, arg);
439 if (istmp)
440 ieee80211_free_node(ni);
441 }
442
443 int
444 ieee80211_alloc_challenge(struct ieee80211_node *ni)
445 {
446 if (ni->ni_challenge == NULL)
447 ni->ni_challenge = (uint32_t *) malloc(IEEE80211_CHALLENGE_LEN,
448 M_80211_NODE, M_NOWAIT);
449 if (ni->ni_challenge == NULL) {
450 IEEE80211_NOTE(ni->ni_vap,
451 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni,
452 "%s", "shared key challenge alloc failed");
453 /* XXX statistic */
454 }
455 return (ni->ni_challenge != NULL);
456 }
457
458 /*
459 * Parse a Beacon or ProbeResponse frame and return the
460 * useful information in an ieee80211_scanparams structure.
461 * Status is set to 0 if no problems were found; otherwise
462 * a bitmask of IEEE80211_BPARSE_* items is returned that
463 * describes the problems detected.
464 */
465 int
466 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m,
467 struct ieee80211_scanparams *scan)
468 {
469 struct ieee80211vap *vap = ni->ni_vap;
470 struct ieee80211com *ic = ni->ni_ic;
471 struct ieee80211_frame *wh;
472 uint8_t *frm, *efrm;
473
474 wh = mtod(m, struct ieee80211_frame *);
475 frm = (uint8_t *)&wh[1];
476 efrm = mtod(m, uint8_t *) + m->m_len;
477 scan->status = 0;
478 /*
479 * beacon/probe response frame format
480 * [8] time stamp
481 * [2] beacon interval
482 * [2] capability information
483 * [tlv] ssid
484 * [tlv] supported rates
485 * [tlv] country information
486 * [tlv] channel switch announcement (CSA)
487 * [tlv] parameter set (FH/DS)
488 * [tlv] erp information
489 * [tlv] extended supported rates
490 * [tlv] WME
491 * [tlv] WPA or RSN
492 * [tlv] HT capabilities
493 * [tlv] HT information
494 * [tlv] Atheros capabilities
495 * [tlv] Mesh ID
496 * [tlv] Mesh Configuration
497 */
498 IEEE80211_VERIFY_LENGTH(efrm - frm, 12,
499 return (scan->status = IEEE80211_BPARSE_BADIELEN));
500 memset(scan, 0, sizeof(*scan));
501 scan->tstamp = frm; frm += 8;
502 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2;
503 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2;
504 scan->bchan = ieee80211_chan2ieee(ic, ic->ic_curchan);
505 scan->chan = scan->bchan;
506 scan->ies = frm;
507 scan->ies_len = efrm - frm;
508
509 while (efrm - frm > 1) {
510 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2,
511 return (scan->status = IEEE80211_BPARSE_BADIELEN));
512 switch (*frm) {
513 case IEEE80211_ELEMID_SSID:
514 scan->ssid = frm;
515 break;
516 case IEEE80211_ELEMID_RATES:
517 scan->rates = frm;
518 break;
519 case IEEE80211_ELEMID_COUNTRY:
520 scan->country = frm;
521 break;
522 case IEEE80211_ELEMID_CSA:
523 scan->csa = frm;
524 break;
525 case IEEE80211_ELEMID_FHPARMS:
526 if (ic->ic_phytype == IEEE80211_T_FH) {
527 scan->fhdwell = LE_READ_2(&frm[2]);
528 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]);
529 scan->fhindex = frm[6];
530 }
531 break;
532 case IEEE80211_ELEMID_DSPARMS:
533 /*
534 * XXX hack this since depending on phytype
535 * is problematic for multi-mode devices.
536 */
537 if (ic->ic_phytype != IEEE80211_T_FH)
538 scan->chan = frm[2];
539 break;
540 case IEEE80211_ELEMID_TIM:
541 /* XXX ATIM? */
542 scan->tim = frm;
543 scan->timoff = frm - mtod(m, uint8_t *);
544 break;
545 case IEEE80211_ELEMID_IBSSPARMS:
546 case IEEE80211_ELEMID_CFPARMS:
547 case IEEE80211_ELEMID_PWRCNSTR:
548 /* NB: avoid debugging complaints */
549 break;
550 case IEEE80211_ELEMID_XRATES:
551 scan->xrates = frm;
552 break;
553 case IEEE80211_ELEMID_ERP:
554 if (frm[1] != 1) {
555 IEEE80211_DISCARD_IE(vap,
556 IEEE80211_MSG_ELEMID, wh, "ERP",
557 "bad len %u", frm[1]);
558 vap->iv_stats.is_rx_elem_toobig++;
559 break;
560 }
561 scan->erp = frm[2] | 0x100;
562 break;
563 case IEEE80211_ELEMID_HTCAP:
564 scan->htcap = frm;
565 break;
566 case IEEE80211_ELEMID_RSN:
567 scan->rsn = frm;
568 break;
569 case IEEE80211_ELEMID_HTINFO:
570 scan->htinfo = frm;
571 break;
572 #ifdef IEEE80211_SUPPORT_MESH
573 case IEEE80211_ELEMID_MESHID:
574 scan->meshid = frm;
575 break;
576 case IEEE80211_ELEMID_MESHCONF:
577 scan->meshconf = frm;
578 break;
579 #endif
580 case IEEE80211_ELEMID_VENDOR:
581 if (iswpaoui(frm))
582 scan->wpa = frm;
583 else if (iswmeparam(frm) || iswmeinfo(frm))
584 scan->wme = frm;
585 #ifdef IEEE80211_SUPPORT_SUPERG
586 else if (isatherosoui(frm))
587 scan->ath = frm;
588 #endif
589 #ifdef IEEE80211_SUPPORT_TDMA
590 else if (istdmaoui(frm))
591 scan->tdma = frm;
592 #endif
593 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
594 /*
595 * Accept pre-draft HT ie's if the
596 * standard ones have not been seen.
597 */
598 if (ishtcapoui(frm)) {
599 if (scan->htcap == NULL)
600 scan->htcap = frm;
601 } else if (ishtinfooui(frm)) {
602 if (scan->htinfo == NULL)
603 scan->htcap = frm;
604 }
605 }
606 break;
607 default:
608 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID,
609 wh, "unhandled",
610 "id %u, len %u", *frm, frm[1]);
611 vap->iv_stats.is_rx_elem_unknown++;
612 break;
613 }
614 frm += frm[1] + 2;
615 }
616 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE,
617 scan->status |= IEEE80211_BPARSE_RATES_INVALID);
618 if (scan->rates != NULL && scan->xrates != NULL) {
619 /*
620 * NB: don't process XRATES if RATES is missing. This
621 * avoids a potential null ptr deref and should be ok
622 * as the return code will already note RATES is missing
623 * (so callers shouldn't otherwise process the frame).
624 */
625 IEEE80211_VERIFY_ELEMENT(scan->xrates,
626 IEEE80211_RATE_MAXSIZE - scan->rates[1],
627 scan->status |= IEEE80211_BPARSE_XRATES_INVALID);
628 }
629 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN,
630 scan->status |= IEEE80211_BPARSE_SSID_INVALID);
631 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) {
632 /*
633 * Frame was received on a channel different from the
634 * one indicated in the DS params element id;
635 * silently discard it.
636 *
637 * NB: this can happen due to signal leakage.
638 * But we should take it for FH phy because
639 * the rssi value should be correct even for
640 * different hop pattern in FH.
641 */
642 IEEE80211_DISCARD(vap,
643 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
644 wh, NULL, "for off-channel %u", scan->chan);
645 vap->iv_stats.is_rx_chanmismatch++;
646 scan->status |= IEEE80211_BPARSE_OFFCHAN;
647 }
648 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval &&
649 scan->bintval <= IEEE80211_BINTVAL_MAX)) {
650 IEEE80211_DISCARD(vap,
651 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
652 wh, NULL, "bogus beacon interval", scan->bintval);
653 vap->iv_stats.is_rx_badbintval++;
654 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID;
655 }
656 if (scan->country != NULL) {
657 /*
658 * Validate we have at least enough data to extract
659 * the country code. Not sure if we should return an
660 * error instead of discarding the IE; consider this
661 * being lenient as we don't depend on the data for
662 * correct operation.
663 */
664 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t),
665 scan->country = NULL);
666 }
667 if (scan->csa != NULL) {
668 /*
669 * Validate Channel Switch Announcement; this must
670 * be the correct length or we toss the frame.
671 */
672 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t),
673 scan->status |= IEEE80211_BPARSE_CSA_INVALID);
674 }
675 /*
676 * Process HT ie's. This is complicated by our
677 * accepting both the standard ie's and the pre-draft
678 * vendor OUI ie's that some vendors still use/require.
679 */
680 if (scan->htcap != NULL) {
681 IEEE80211_VERIFY_LENGTH(scan->htcap[1],
682 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ?
683 4 + sizeof(struct ieee80211_ie_htcap)-2 :
684 sizeof(struct ieee80211_ie_htcap)-2,
685 scan->htcap = NULL);
686 }
687 if (scan->htinfo != NULL) {
688 IEEE80211_VERIFY_LENGTH(scan->htinfo[1],
689 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ?
690 4 + sizeof(struct ieee80211_ie_htinfo)-2 :
691 sizeof(struct ieee80211_ie_htinfo)-2,
692 scan->htinfo = NULL);
693 }
694 return scan->status;
695 }
696
697 /*
698 * Parse an Action frame. Return 0 on success, non-zero on failure.
699 */
700 int
701 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m)
702 {
703 struct ieee80211vap *vap = ni->ni_vap;
704 const struct ieee80211_action *ia;
705 struct ieee80211_frame *wh;
706 uint8_t *frm, *efrm;
707
708 /*
709 * action frame format:
710 * [1] category
711 * [1] action
712 * [tlv] parameters
713 */
714 wh = mtod(m, struct ieee80211_frame *);
715 frm = (u_int8_t *)&wh[1];
716 efrm = mtod(m, u_int8_t *) + m->m_len;
717 IEEE80211_VERIFY_LENGTH(efrm - frm,
718 sizeof(struct ieee80211_action), return EINVAL);
719 ia = (const struct ieee80211_action *) frm;
720
721 vap->iv_stats.is_rx_action++;
722 IEEE80211_NODE_STAT(ni, rx_action);
723
724 /* verify frame payloads but defer processing */
725 switch (ia->ia_category) {
726 case IEEE80211_ACTION_CAT_BA:
727 switch (ia->ia_action) {
728 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
729 IEEE80211_VERIFY_LENGTH(efrm - frm,
730 sizeof(struct ieee80211_action_ba_addbarequest),
731 return EINVAL);
732 break;
733 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
734 IEEE80211_VERIFY_LENGTH(efrm - frm,
735 sizeof(struct ieee80211_action_ba_addbaresponse),
736 return EINVAL);
737 break;
738 case IEEE80211_ACTION_BA_DELBA:
739 IEEE80211_VERIFY_LENGTH(efrm - frm,
740 sizeof(struct ieee80211_action_ba_delba),
741 return EINVAL);
742 break;
743 }
744 break;
745 case IEEE80211_ACTION_CAT_HT:
746 switch (ia->ia_action) {
747 case IEEE80211_ACTION_HT_TXCHWIDTH:
748 IEEE80211_VERIFY_LENGTH(efrm - frm,
749 sizeof(struct ieee80211_action_ht_txchwidth),
750 return EINVAL);
751 break;
752 case IEEE80211_ACTION_HT_MIMOPWRSAVE:
753 IEEE80211_VERIFY_LENGTH(efrm - frm,
754 sizeof(struct ieee80211_action_ht_mimopowersave),
755 return EINVAL);
756 break;
757 }
758 break;
759 }
760 return 0;
761 }
762
763 #ifdef IEEE80211_DEBUG
764 /*
765 * Debugging support.
766 */
767 void
768 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag,
769 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid)
770 {
771 printf("[%s] discard %s frame, ssid mismatch: ",
772 ether_sprintf(mac), tag);
773 ieee80211_print_essid(ssid + 2, ssid[1]);
774 printf("\n");
775 }
776
777 /*
778 * Return the bssid of a frame.
779 */
780 static const uint8_t *
781 ieee80211_getbssid(const struct ieee80211vap *vap,
782 const struct ieee80211_frame *wh)
783 {
784 if (vap->iv_opmode == IEEE80211_M_STA)
785 return wh->i_addr2;
786 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS)
787 return wh->i_addr1;
788 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL)
789 return wh->i_addr1;
790 return wh->i_addr3;
791 }
792
793 #include <machine/stdarg.h>
794
795 void
796 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...)
797 {
798 char buf[128]; /* XXX */
799 va_list ap;
800
801 va_start(ap, fmt);
802 vsnprintf(buf, sizeof(buf), fmt, ap);
803 va_end(ap);
804
805 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */
806 }
807
808 void
809 ieee80211_note_frame(const struct ieee80211vap *vap,
810 const struct ieee80211_frame *wh,
811 const char *fmt, ...)
812 {
813 char buf[128]; /* XXX */
814 va_list ap;
815
816 va_start(ap, fmt);
817 vsnprintf(buf, sizeof(buf), fmt, ap);
818 va_end(ap);
819 if_printf(vap->iv_ifp, "[%s] %s\n",
820 ether_sprintf(ieee80211_getbssid(vap, wh)), buf);
821 }
822
823 void
824 ieee80211_note_mac(const struct ieee80211vap *vap,
825 const uint8_t mac[IEEE80211_ADDR_LEN],
826 const char *fmt, ...)
827 {
828 char buf[128]; /* XXX */
829 va_list ap;
830
831 va_start(ap, fmt);
832 vsnprintf(buf, sizeof(buf), fmt, ap);
833 va_end(ap);
834 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf);
835 }
836
837 void
838 ieee80211_discard_frame(const struct ieee80211vap *vap,
839 const struct ieee80211_frame *wh,
840 const char *type, const char *fmt, ...)
841 {
842 va_list ap;
843
844 if_printf(vap->iv_ifp, "[%s] discard ",
845 ether_sprintf(ieee80211_getbssid(vap, wh)));
846 if (type == NULL) {
847 printf("%s frame, ", ieee80211_mgt_subtype_name[
848 (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) >>
849 IEEE80211_FC0_SUBTYPE_SHIFT]);
850 } else
851 printf("%s frame, ", type);
852 va_start(ap, fmt);
853 vprintf(fmt, ap);
854 va_end(ap);
855 printf("\n");
856 }
857
858 void
859 ieee80211_discard_ie(const struct ieee80211vap *vap,
860 const struct ieee80211_frame *wh,
861 const char *type, const char *fmt, ...)
862 {
863 va_list ap;
864
865 if_printf(vap->iv_ifp, "[%s] discard ",
866 ether_sprintf(ieee80211_getbssid(vap, wh)));
867 if (type != NULL)
868 printf("%s information element, ", type);
869 else
870 printf("information element, ");
871 va_start(ap, fmt);
872 vprintf(fmt, ap);
873 va_end(ap);
874 printf("\n");
875 }
876
877 void
878 ieee80211_discard_mac(const struct ieee80211vap *vap,
879 const uint8_t mac[IEEE80211_ADDR_LEN],
880 const char *type, const char *fmt, ...)
881 {
882 va_list ap;
883
884 if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac));
885 if (type != NULL)
886 printf("%s frame, ", type);
887 else
888 printf("frame, ");
889 va_start(ap, fmt);
890 vprintf(fmt, ap);
891 va_end(ap);
892 printf("\n");
893 }
894 #endif /* IEEE80211_DEBUG */
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