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("$FreeBSD$");
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_var.h>
44 #include <net/if_llc.h>
45 #include <net/if_media.h>
46 #include <net/if_vlan_var.h>
47
48 #include <net80211/ieee80211_var.h>
49 #include <net80211/ieee80211_input.h>
50 #ifdef IEEE80211_SUPPORT_MESH
51 #include <net80211/ieee80211_mesh.h>
52 #endif
53
54 #include <net/bpf.h>
55
56 #ifdef INET
57 #include <netinet/in.h>
58 #include <net/ethernet.h>
59 #endif
60
61 static void
62 ieee80211_process_mimo(struct ieee80211_node *ni, struct ieee80211_rx_stats *rx)
63 {
64 int i;
65
66 /* Verify the required MIMO bits are set */
67 if ((rx->r_flags & (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI)) !=
68 (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI))
69 return;
70
71 /* XXX This assumes the MIMO radios have both ctl and ext chains */
72 for (i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) {
73 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ctl[i], rx->c_rssi_ctl[i]);
74 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ext[i], rx->c_rssi_ext[i]);
75 }
76
77 /* XXX This also assumes the MIMO radios have both ctl and ext chains */
78 for(i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) {
79 ni->ni_mimo_noise_ctl[i] = rx->c_nf_ctl[i];
80 ni->ni_mimo_noise_ext[i] = rx->c_nf_ext[i];
81 }
82 ni->ni_mimo_chains = rx->c_chain;
83 }
84
85 int
86 ieee80211_input_mimo(struct ieee80211_node *ni, struct mbuf *m,
87 struct ieee80211_rx_stats *rx)
88 {
89 struct ieee80211_rx_stats rxs;
90
91 if (rx) {
92 memcpy(&rxs, rx, sizeof(*rx));
93 } else {
94 /* try to read from mbuf */
95 bzero(&rxs, sizeof(rxs));
96 ieee80211_get_rx_params(m, &rxs);
97 }
98
99 /* XXX should assert IEEE80211_R_NF and IEEE80211_R_RSSI are set */
100 ieee80211_process_mimo(ni, &rxs);
101
102 //return ieee80211_input(ni, m, rx->rssi, rx->nf);
103 return ni->ni_vap->iv_input(ni, m, &rxs, rxs.rssi, rxs.nf);
104 }
105
106 int
107 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf)
108 {
109 struct ieee80211_rx_stats rx;
110
111 rx.r_flags = IEEE80211_R_NF | IEEE80211_R_RSSI;
112 rx.nf = nf;
113 rx.rssi = rssi;
114 return ieee80211_input_mimo_all(ic, m, &rx);
115 }
116
117 int
118 ieee80211_input_mimo_all(struct ieee80211com *ic, struct mbuf *m,
119 struct ieee80211_rx_stats *rx)
120 {
121 struct ieee80211_rx_stats rxs;
122 struct ieee80211vap *vap;
123 int type = -1;
124
125 m->m_flags |= M_BCAST; /* NB: mark for bpf tap'ing */
126
127 if (rx) {
128 memcpy(&rxs, rx, sizeof(*rx));
129 } else {
130 /* try to read from mbuf */
131 bzero(&rxs, sizeof(rxs));
132 ieee80211_get_rx_params(m, &rxs);
133 }
134
135 /* XXX locking */
136 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
137 struct ieee80211_node *ni;
138 struct mbuf *mcopy;
139
140 /* NB: could check for IFF_UP but this is cheaper */
141 if (vap->iv_state == IEEE80211_S_INIT)
142 continue;
143 /*
144 * WDS vap's only receive directed traffic from the
145 * station at the ``far end''. That traffic should
146 * be passed through the AP vap the station is associated
147 * to--so don't spam them with mcast frames.
148 */
149 if (vap->iv_opmode == IEEE80211_M_WDS)
150 continue;
151 if (TAILQ_NEXT(vap, iv_next) != NULL) {
152 /*
153 * Packet contents are changed by ieee80211_decap
154 * so do a deep copy of the packet.
155 */
156 mcopy = m_dup(m, M_NOWAIT);
157 if (mcopy == NULL) {
158 /* XXX stat+msg */
159 continue;
160 }
161 } else {
162 mcopy = m;
163 m = NULL;
164 }
165 ni = ieee80211_ref_node(vap->iv_bss);
166 type = ieee80211_input_mimo(ni, mcopy, &rxs);
167 ieee80211_free_node(ni);
168 }
169 if (m != NULL) /* no vaps, reclaim mbuf */
170 m_freem(m);
171 return type;
172 }
173
174 /*
175 * This function reassembles fragments.
176 *
177 * XXX should handle 3 concurrent reassemblies per-spec.
178 */
179 struct mbuf *
180 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace)
181 {
182 struct ieee80211vap *vap = ni->ni_vap;
183 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
184 struct ieee80211_frame *lwh;
185 uint16_t rxseq;
186 uint8_t fragno;
187 uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG;
188 struct mbuf *mfrag;
189
190 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?"));
191
192 rxseq = le16toh(*(uint16_t *)wh->i_seq);
193 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK;
194
195 /* Quick way out, if there's nothing to defragment */
196 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL)
197 return m;
198
199 /*
200 * Remove frag to insure it doesn't get reaped by timer.
201 */
202 if (ni->ni_table == NULL) {
203 /*
204 * Should never happen. If the node is orphaned (not in
205 * the table) then input packets should not reach here.
206 * Otherwise, a concurrent request that yanks the table
207 * should be blocked by other interlocking and/or by first
208 * shutting the driver down. Regardless, be defensive
209 * here and just bail
210 */
211 /* XXX need msg+stat */
212 m_freem(m);
213 return NULL;
214 }
215 IEEE80211_NODE_LOCK(ni->ni_table);
216 mfrag = ni->ni_rxfrag[0];
217 ni->ni_rxfrag[0] = NULL;
218 IEEE80211_NODE_UNLOCK(ni->ni_table);
219
220 /*
221 * Validate new fragment is in order and
222 * related to the previous ones.
223 */
224 if (mfrag != NULL) {
225 uint16_t last_rxseq;
226
227 lwh = mtod(mfrag, struct ieee80211_frame *);
228 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq);
229 /* NB: check seq # and frag together */
230 if (rxseq == last_rxseq+1 &&
231 IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) &&
232 IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) {
233 /* XXX clear MORE_FRAG bit? */
234 /* track last seqnum and fragno */
235 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq;
236
237 m_adj(m, hdrspace); /* strip header */
238 m_catpkt(mfrag, m); /* concatenate */
239 } else {
240 /*
241 * Unrelated fragment or no space for it,
242 * clear current fragments.
243 */
244 m_freem(mfrag);
245 mfrag = NULL;
246 }
247 }
248
249 if (mfrag == NULL) {
250 if (fragno != 0) { /* !first fragment, discard */
251 vap->iv_stats.is_rx_defrag++;
252 IEEE80211_NODE_STAT(ni, rx_defrag);
253 m_freem(m);
254 return NULL;
255 }
256 mfrag = m;
257 }
258 if (more_frag) { /* more to come, save */
259 ni->ni_rxfragstamp = ticks;
260 ni->ni_rxfrag[0] = mfrag;
261 mfrag = NULL;
262 }
263 return mfrag;
264 }
265
266 void
267 ieee80211_deliver_data(struct ieee80211vap *vap,
268 struct ieee80211_node *ni, struct mbuf *m)
269 {
270 struct ether_header *eh = mtod(m, struct ether_header *);
271 struct ifnet *ifp = vap->iv_ifp;
272
273 /* clear driver/net80211 flags before passing up */
274 m->m_flags &= ~(M_MCAST | M_BCAST);
275 m_clrprotoflags(m);
276
277 /* NB: see hostap_deliver_data, this path doesn't handle hostap */
278 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap"));
279 /*
280 * Do accounting.
281 */
282 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
283 IEEE80211_NODE_STAT(ni, rx_data);
284 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
285 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
286 if (ETHER_IS_BROADCAST(eh->ether_dhost))
287 m->m_flags |= M_BCAST;
288 else
289 m->m_flags |= M_MCAST;
290 IEEE80211_NODE_STAT(ni, rx_mcast);
291 } else
292 IEEE80211_NODE_STAT(ni, rx_ucast);
293 m->m_pkthdr.rcvif = ifp;
294
295 if (ni->ni_vlan != 0) {
296 /* attach vlan tag */
297 m->m_pkthdr.ether_vtag = ni->ni_vlan;
298 m->m_flags |= M_VLANTAG;
299 }
300 ifp->if_input(ifp, m);
301 }
302
303 struct mbuf *
304 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen)
305 {
306 struct ieee80211_qosframe_addr4 wh;
307 struct ether_header *eh;
308 struct llc *llc;
309
310 KASSERT(hdrlen <= sizeof(wh),
311 ("hdrlen %d > max %zd", hdrlen, sizeof(wh)));
312
313 if (m->m_len < hdrlen + sizeof(*llc) &&
314 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) {
315 vap->iv_stats.is_rx_tooshort++;
316 /* XXX msg */
317 return NULL;
318 }
319 memcpy(&wh, mtod(m, caddr_t), hdrlen);
320 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen);
321 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP &&
322 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 &&
323 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 &&
324 /* NB: preserve AppleTalk frames that have a native SNAP hdr */
325 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) ||
326 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) {
327 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh));
328 llc = NULL;
329 } else {
330 m_adj(m, hdrlen - sizeof(*eh));
331 }
332 eh = mtod(m, struct ether_header *);
333 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) {
334 case IEEE80211_FC1_DIR_NODS:
335 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
336 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
337 break;
338 case IEEE80211_FC1_DIR_TODS:
339 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
340 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
341 break;
342 case IEEE80211_FC1_DIR_FROMDS:
343 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
344 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3);
345 break;
346 case IEEE80211_FC1_DIR_DSTODS:
347 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
348 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4);
349 break;
350 }
351 #ifndef __NO_STRICT_ALIGNMENT
352 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) {
353 m = ieee80211_realign(vap, m, sizeof(*eh));
354 if (m == NULL)
355 return NULL;
356 }
357 #endif /* !__NO_STRICT_ALIGNMENT */
358 if (llc != NULL) {
359 eh = mtod(m, struct ether_header *);
360 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh));
361 }
362 return m;
363 }
364
365 /*
366 * Decap a frame encapsulated in a fast-frame/A-MSDU.
367 */
368 struct mbuf *
369 ieee80211_decap1(struct mbuf *m, int *framelen)
370 {
371 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc))
372 struct ether_header *eh;
373 struct llc *llc;
374
375 /*
376 * The frame has an 802.3 header followed by an 802.2
377 * LLC header. The encapsulated frame length is in the
378 * first header type field; save that and overwrite it
379 * with the true type field found in the second. Then
380 * copy the 802.3 header up to where it belongs and
381 * adjust the mbuf contents to remove the void.
382 */
383 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL)
384 return NULL;
385 eh = mtod(m, struct ether_header *); /* 802.3 header is first */
386 llc = (struct llc *)&eh[1]; /* 802.2 header follows */
387 *framelen = ntohs(eh->ether_type) /* encap'd frame size */
388 + sizeof(struct ether_header) - sizeof(struct llc);
389 eh->ether_type = llc->llc_un.type_snap.ether_type;
390 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc),
391 sizeof(struct ether_header));
392 m_adj(m, sizeof(struct llc));
393 return m;
394 #undef FF_LLC_SIZE
395 }
396
397 /*
398 * Install received rate set information in the node's state block.
399 */
400 int
401 ieee80211_setup_rates(struct ieee80211_node *ni,
402 const uint8_t *rates, const uint8_t *xrates, int flags)
403 {
404 struct ieee80211vap *vap = ni->ni_vap;
405 struct ieee80211_rateset *rs = &ni->ni_rates;
406
407 memset(rs, 0, sizeof(*rs));
408 rs->rs_nrates = rates[1];
409 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates);
410 if (xrates != NULL) {
411 uint8_t nxrates;
412 /*
413 * Tack on 11g extended supported rate element.
414 */
415 nxrates = xrates[1];
416 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) {
417 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates;
418 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni,
419 "extended rate set too large; only using "
420 "%u of %u rates", nxrates, xrates[1]);
421 vap->iv_stats.is_rx_rstoobig++;
422 }
423 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates);
424 rs->rs_nrates += nxrates;
425 }
426 return ieee80211_fix_rate(ni, rs, flags);
427 }
428
429 /*
430 * Send a management frame error response to the specified
431 * station. If ni is associated with the station then use
432 * it; otherwise allocate a temporary node suitable for
433 * transmitting the frame and then free the reference so
434 * it will go away as soon as the frame has been transmitted.
435 */
436 void
437 ieee80211_send_error(struct ieee80211_node *ni,
438 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg)
439 {
440 struct ieee80211vap *vap = ni->ni_vap;
441 int istmp;
442
443 if (ni == vap->iv_bss) {
444 if (vap->iv_state != IEEE80211_S_RUN) {
445 /*
446 * XXX hack until we get rid of this routine.
447 * We can be called prior to the vap reaching
448 * run state under certain conditions in which
449 * case iv_bss->ni_chan will not be setup.
450 * Check for this explicitly and and just ignore
451 * the request.
452 */
453 return;
454 }
455 ni = ieee80211_tmp_node(vap, mac);
456 if (ni == NULL) {
457 /* XXX msg */
458 return;
459 }
460 istmp = 1;
461 } else
462 istmp = 0;
463 IEEE80211_SEND_MGMT(ni, subtype, arg);
464 if (istmp)
465 ieee80211_free_node(ni);
466 }
467
468 int
469 ieee80211_alloc_challenge(struct ieee80211_node *ni)
470 {
471 if (ni->ni_challenge == NULL)
472 ni->ni_challenge = (uint32_t *)
473 IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN,
474 M_80211_NODE, IEEE80211_M_NOWAIT);
475 if (ni->ni_challenge == NULL) {
476 IEEE80211_NOTE(ni->ni_vap,
477 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni,
478 "%s", "shared key challenge alloc failed");
479 /* XXX statistic */
480 }
481 return (ni->ni_challenge != NULL);
482 }
483
484 /*
485 * Parse a Beacon or ProbeResponse frame and return the
486 * useful information in an ieee80211_scanparams structure.
487 * Status is set to 0 if no problems were found; otherwise
488 * a bitmask of IEEE80211_BPARSE_* items is returned that
489 * describes the problems detected.
490 */
491 int
492 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m,
493 struct ieee80211_channel *rxchan, struct ieee80211_scanparams *scan)
494 {
495 struct ieee80211vap *vap = ni->ni_vap;
496 struct ieee80211com *ic = ni->ni_ic;
497 struct ieee80211_frame *wh;
498 uint8_t *frm, *efrm;
499
500 wh = mtod(m, struct ieee80211_frame *);
501 frm = (uint8_t *)&wh[1];
502 efrm = mtod(m, uint8_t *) + m->m_len;
503 scan->status = 0;
504 /*
505 * beacon/probe response frame format
506 * [8] time stamp
507 * [2] beacon interval
508 * [2] capability information
509 * [tlv] ssid
510 * [tlv] supported rates
511 * [tlv] country information
512 * [tlv] channel switch announcement (CSA)
513 * [tlv] parameter set (FH/DS)
514 * [tlv] erp information
515 * [tlv] extended supported rates
516 * [tlv] WME
517 * [tlv] WPA or RSN
518 * [tlv] HT capabilities
519 * [tlv] HT information
520 * [tlv] Atheros capabilities
521 * [tlv] Mesh ID
522 * [tlv] Mesh Configuration
523 */
524 IEEE80211_VERIFY_LENGTH(efrm - frm, 12,
525 return (scan->status = IEEE80211_BPARSE_BADIELEN));
526 memset(scan, 0, sizeof(*scan));
527 scan->tstamp = frm; frm += 8;
528 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2;
529 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2;
530 scan->bchan = ieee80211_chan2ieee(ic, rxchan);
531 scan->chan = scan->bchan;
532 scan->ies = frm;
533 scan->ies_len = efrm - frm;
534
535 while (efrm - frm > 1) {
536 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2,
537 return (scan->status = IEEE80211_BPARSE_BADIELEN));
538 switch (*frm) {
539 case IEEE80211_ELEMID_SSID:
540 scan->ssid = frm;
541 break;
542 case IEEE80211_ELEMID_RATES:
543 scan->rates = frm;
544 break;
545 case IEEE80211_ELEMID_COUNTRY:
546 scan->country = frm;
547 break;
548 case IEEE80211_ELEMID_CSA:
549 scan->csa = frm;
550 break;
551 case IEEE80211_ELEMID_QUIET:
552 scan->quiet = frm;
553 break;
554 case IEEE80211_ELEMID_FHPARMS:
555 if (ic->ic_phytype == IEEE80211_T_FH) {
556 scan->fhdwell = le16dec(&frm[2]);
557 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]);
558 scan->fhindex = frm[6];
559 }
560 break;
561 case IEEE80211_ELEMID_DSPARMS:
562 /*
563 * XXX hack this since depending on phytype
564 * is problematic for multi-mode devices.
565 */
566 if (ic->ic_phytype != IEEE80211_T_FH)
567 scan->chan = frm[2];
568 break;
569 case IEEE80211_ELEMID_TIM:
570 /* XXX ATIM? */
571 scan->tim = frm;
572 scan->timoff = frm - mtod(m, uint8_t *);
573 break;
574 case IEEE80211_ELEMID_IBSSPARMS:
575 case IEEE80211_ELEMID_CFPARMS:
576 case IEEE80211_ELEMID_PWRCNSTR:
577 case IEEE80211_ELEMID_BSSLOAD:
578 case IEEE80211_ELEMID_APCHANREP:
579 /* NB: avoid debugging complaints */
580 break;
581 case IEEE80211_ELEMID_XRATES:
582 scan->xrates = frm;
583 break;
584 case IEEE80211_ELEMID_ERP:
585 if (frm[1] != 1) {
586 IEEE80211_DISCARD_IE(vap,
587 IEEE80211_MSG_ELEMID, wh, "ERP",
588 "bad len %u", frm[1]);
589 vap->iv_stats.is_rx_elem_toobig++;
590 break;
591 }
592 scan->erp = frm[2] | 0x100;
593 break;
594 case IEEE80211_ELEMID_HTCAP:
595 scan->htcap = frm;
596 break;
597 case IEEE80211_ELEMID_RSN:
598 scan->rsn = frm;
599 break;
600 case IEEE80211_ELEMID_HTINFO:
601 scan->htinfo = frm;
602 break;
603 #ifdef IEEE80211_SUPPORT_MESH
604 case IEEE80211_ELEMID_MESHID:
605 scan->meshid = frm;
606 break;
607 case IEEE80211_ELEMID_MESHCONF:
608 scan->meshconf = frm;
609 break;
610 #endif
611 /* Extended capabilities; nothing handles it for now */
612 case IEEE80211_ELEMID_EXTCAP:
613 break;
614 case IEEE80211_ELEMID_VENDOR:
615 if (iswpaoui(frm))
616 scan->wpa = frm;
617 else if (iswmeparam(frm) || iswmeinfo(frm))
618 scan->wme = frm;
619 #ifdef IEEE80211_SUPPORT_SUPERG
620 else if (isatherosoui(frm))
621 scan->ath = frm;
622 #endif
623 #ifdef IEEE80211_SUPPORT_TDMA
624 else if (istdmaoui(frm))
625 scan->tdma = frm;
626 #endif
627 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
628 /*
629 * Accept pre-draft HT ie's if the
630 * standard ones have not been seen.
631 */
632 if (ishtcapoui(frm)) {
633 if (scan->htcap == NULL)
634 scan->htcap = frm;
635 } else if (ishtinfooui(frm)) {
636 if (scan->htinfo == NULL)
637 scan->htcap = frm;
638 }
639 }
640 break;
641 default:
642 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID,
643 wh, "unhandled",
644 "id %u, len %u", *frm, frm[1]);
645 vap->iv_stats.is_rx_elem_unknown++;
646 break;
647 }
648 frm += frm[1] + 2;
649 }
650 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE,
651 scan->status |= IEEE80211_BPARSE_RATES_INVALID);
652 if (scan->rates != NULL && scan->xrates != NULL) {
653 /*
654 * NB: don't process XRATES if RATES is missing. This
655 * avoids a potential null ptr deref and should be ok
656 * as the return code will already note RATES is missing
657 * (so callers shouldn't otherwise process the frame).
658 */
659 IEEE80211_VERIFY_ELEMENT(scan->xrates,
660 IEEE80211_RATE_MAXSIZE - scan->rates[1],
661 scan->status |= IEEE80211_BPARSE_XRATES_INVALID);
662 }
663 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN,
664 scan->status |= IEEE80211_BPARSE_SSID_INVALID);
665 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) {
666 /*
667 * Frame was received on a channel different from the
668 * one indicated in the DS params element id;
669 * silently discard it.
670 *
671 * NB: this can happen due to signal leakage.
672 * But we should take it for FH phy because
673 * the rssi value should be correct even for
674 * different hop pattern in FH.
675 */
676 IEEE80211_DISCARD(vap,
677 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
678 wh, NULL, "for off-channel %u (bchan=%u)",
679 scan->chan, scan->bchan);
680 vap->iv_stats.is_rx_chanmismatch++;
681 scan->status |= IEEE80211_BPARSE_OFFCHAN;
682 }
683 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval &&
684 scan->bintval <= IEEE80211_BINTVAL_MAX)) {
685 IEEE80211_DISCARD(vap,
686 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
687 wh, NULL, "bogus beacon interval (%d TU)",
688 (int) scan->bintval);
689 vap->iv_stats.is_rx_badbintval++;
690 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID;
691 }
692 if (scan->country != NULL) {
693 /*
694 * Validate we have at least enough data to extract
695 * the country code. Not sure if we should return an
696 * error instead of discarding the IE; consider this
697 * being lenient as we don't depend on the data for
698 * correct operation.
699 */
700 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t),
701 scan->country = NULL);
702 }
703 if (scan->csa != NULL) {
704 /*
705 * Validate Channel Switch Announcement; this must
706 * be the correct length or we toss the frame.
707 */
708 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t),
709 scan->status |= IEEE80211_BPARSE_CSA_INVALID);
710 }
711 #ifdef IEEE80211_SUPPORT_MESH
712 if (scan->meshid != NULL) {
713 IEEE80211_VERIFY_ELEMENT(scan->meshid, IEEE80211_MESHID_LEN,
714 scan->status |= IEEE80211_BPARSE_RATES_INVALID);
715 }
716 #endif
717 /*
718 * Process HT ie's. This is complicated by our
719 * accepting both the standard ie's and the pre-draft
720 * vendor OUI ie's that some vendors still use/require.
721 */
722 if (scan->htcap != NULL) {
723 IEEE80211_VERIFY_LENGTH(scan->htcap[1],
724 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ?
725 4 + sizeof(struct ieee80211_ie_htcap)-2 :
726 sizeof(struct ieee80211_ie_htcap)-2,
727 scan->htcap = NULL);
728 }
729 if (scan->htinfo != NULL) {
730 IEEE80211_VERIFY_LENGTH(scan->htinfo[1],
731 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ?
732 4 + sizeof(struct ieee80211_ie_htinfo)-2 :
733 sizeof(struct ieee80211_ie_htinfo)-2,
734 scan->htinfo = NULL);
735 }
736 return scan->status;
737 }
738
739 /*
740 * Parse an Action frame. Return 0 on success, non-zero on failure.
741 */
742 int
743 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m)
744 {
745 struct ieee80211vap *vap = ni->ni_vap;
746 const struct ieee80211_action *ia;
747 struct ieee80211_frame *wh;
748 uint8_t *frm, *efrm;
749
750 /*
751 * action frame format:
752 * [1] category
753 * [1] action
754 * [tlv] parameters
755 */
756 wh = mtod(m, struct ieee80211_frame *);
757 frm = (u_int8_t *)&wh[1];
758 efrm = mtod(m, u_int8_t *) + m->m_len;
759 IEEE80211_VERIFY_LENGTH(efrm - frm,
760 sizeof(struct ieee80211_action), return EINVAL);
761 ia = (const struct ieee80211_action *) frm;
762
763 vap->iv_stats.is_rx_action++;
764 IEEE80211_NODE_STAT(ni, rx_action);
765
766 /* verify frame payloads but defer processing */
767 switch (ia->ia_category) {
768 case IEEE80211_ACTION_CAT_BA:
769 switch (ia->ia_action) {
770 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
771 IEEE80211_VERIFY_LENGTH(efrm - frm,
772 sizeof(struct ieee80211_action_ba_addbarequest),
773 return EINVAL);
774 break;
775 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
776 IEEE80211_VERIFY_LENGTH(efrm - frm,
777 sizeof(struct ieee80211_action_ba_addbaresponse),
778 return EINVAL);
779 break;
780 case IEEE80211_ACTION_BA_DELBA:
781 IEEE80211_VERIFY_LENGTH(efrm - frm,
782 sizeof(struct ieee80211_action_ba_delba),
783 return EINVAL);
784 break;
785 }
786 break;
787 case IEEE80211_ACTION_CAT_HT:
788 switch (ia->ia_action) {
789 case IEEE80211_ACTION_HT_TXCHWIDTH:
790 IEEE80211_VERIFY_LENGTH(efrm - frm,
791 sizeof(struct ieee80211_action_ht_txchwidth),
792 return EINVAL);
793 break;
794 case IEEE80211_ACTION_HT_MIMOPWRSAVE:
795 IEEE80211_VERIFY_LENGTH(efrm - frm,
796 sizeof(struct ieee80211_action_ht_mimopowersave),
797 return EINVAL);
798 break;
799 }
800 break;
801 #ifdef IEEE80211_SUPPORT_MESH
802 case IEEE80211_ACTION_CAT_MESH:
803 switch (ia->ia_action) {
804 case IEEE80211_ACTION_MESH_LMETRIC:
805 /*
806 * XXX: verification is true only if we are using
807 * Airtime link metric (default)
808 */
809 IEEE80211_VERIFY_LENGTH(efrm - frm,
810 sizeof(struct ieee80211_meshlmetric_ie),
811 return EINVAL);
812 break;
813 case IEEE80211_ACTION_MESH_HWMP:
814 /* verify something */
815 break;
816 case IEEE80211_ACTION_MESH_GANN:
817 IEEE80211_VERIFY_LENGTH(efrm - frm,
818 sizeof(struct ieee80211_meshgann_ie),
819 return EINVAL);
820 break;
821 case IEEE80211_ACTION_MESH_CC:
822 case IEEE80211_ACTION_MESH_MCCA_SREQ:
823 case IEEE80211_ACTION_MESH_MCCA_SREP:
824 case IEEE80211_ACTION_MESH_MCCA_AREQ:
825 case IEEE80211_ACTION_MESH_MCCA_ADVER:
826 case IEEE80211_ACTION_MESH_MCCA_TRDOWN:
827 case IEEE80211_ACTION_MESH_TBTT_REQ:
828 case IEEE80211_ACTION_MESH_TBTT_RES:
829 /* reject these early on, not implemented */
830 IEEE80211_DISCARD(vap,
831 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
832 wh, NULL, "not implemented yet, act=0x%02X",
833 ia->ia_action);
834 return EINVAL;
835 }
836 break;
837 case IEEE80211_ACTION_CAT_SELF_PROT:
838 /* If TA or RA group address discard silently */
839 if (IEEE80211_IS_MULTICAST(wh->i_addr1) ||
840 IEEE80211_IS_MULTICAST(wh->i_addr2))
841 return EINVAL;
842 /*
843 * XXX: Should we verify complete length now or it is
844 * to varying in sizes?
845 */
846 switch (ia->ia_action) {
847 case IEEE80211_ACTION_MESHPEERING_CONFIRM:
848 case IEEE80211_ACTION_MESHPEERING_CLOSE:
849 /* is not a peering candidate (yet) */
850 if (ni == vap->iv_bss)
851 return EINVAL;
852 break;
853 }
854 break;
855 #endif
856 }
857 return 0;
858 }
859
860 #ifdef IEEE80211_DEBUG
861 /*
862 * Debugging support.
863 */
864 void
865 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag,
866 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid)
867 {
868 printf("[%s] discard %s frame, ssid mismatch: ",
869 ether_sprintf(mac), tag);
870 ieee80211_print_essid(ssid + 2, ssid[1]);
871 printf("\n");
872 }
873
874 /*
875 * Return the bssid of a frame.
876 */
877 static const uint8_t *
878 ieee80211_getbssid(const struct ieee80211vap *vap,
879 const struct ieee80211_frame *wh)
880 {
881 if (vap->iv_opmode == IEEE80211_M_STA)
882 return wh->i_addr2;
883 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS)
884 return wh->i_addr1;
885 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL)
886 return wh->i_addr1;
887 return wh->i_addr3;
888 }
889
890 #include <machine/stdarg.h>
891
892 void
893 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...)
894 {
895 char buf[128]; /* XXX */
896 va_list ap;
897
898 va_start(ap, fmt);
899 vsnprintf(buf, sizeof(buf), fmt, ap);
900 va_end(ap);
901
902 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */
903 }
904
905 void
906 ieee80211_note_frame(const struct ieee80211vap *vap,
907 const struct ieee80211_frame *wh,
908 const char *fmt, ...)
909 {
910 char buf[128]; /* XXX */
911 va_list ap;
912
913 va_start(ap, fmt);
914 vsnprintf(buf, sizeof(buf), fmt, ap);
915 va_end(ap);
916 if_printf(vap->iv_ifp, "[%s] %s\n",
917 ether_sprintf(ieee80211_getbssid(vap, wh)), buf);
918 }
919
920 void
921 ieee80211_note_mac(const struct ieee80211vap *vap,
922 const uint8_t mac[IEEE80211_ADDR_LEN],
923 const char *fmt, ...)
924 {
925 char buf[128]; /* XXX */
926 va_list ap;
927
928 va_start(ap, fmt);
929 vsnprintf(buf, sizeof(buf), fmt, ap);
930 va_end(ap);
931 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf);
932 }
933
934 void
935 ieee80211_discard_frame(const struct ieee80211vap *vap,
936 const struct ieee80211_frame *wh,
937 const char *type, const char *fmt, ...)
938 {
939 va_list ap;
940
941 if_printf(vap->iv_ifp, "[%s] discard ",
942 ether_sprintf(ieee80211_getbssid(vap, wh)));
943 printf("%s frame, ", type != NULL ? type :
944 ieee80211_mgt_subtype_name(wh->i_fc[0]));
945 va_start(ap, fmt);
946 vprintf(fmt, ap);
947 va_end(ap);
948 printf("\n");
949 }
950
951 void
952 ieee80211_discard_ie(const struct ieee80211vap *vap,
953 const struct ieee80211_frame *wh,
954 const char *type, const char *fmt, ...)
955 {
956 va_list ap;
957
958 if_printf(vap->iv_ifp, "[%s] discard ",
959 ether_sprintf(ieee80211_getbssid(vap, wh)));
960 if (type != NULL)
961 printf("%s information element, ", type);
962 else
963 printf("information element, ");
964 va_start(ap, fmt);
965 vprintf(fmt, ap);
966 va_end(ap);
967 printf("\n");
968 }
969
970 void
971 ieee80211_discard_mac(const struct ieee80211vap *vap,
972 const uint8_t mac[IEEE80211_ADDR_LEN],
973 const char *type, const char *fmt, ...)
974 {
975 va_list ap;
976
977 if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac));
978 if (type != NULL)
979 printf("%s frame, ", type);
980 else
981 printf("frame, ");
982 va_start(ap, fmt);
983 vprintf(fmt, ap);
984 va_end(ap);
985 printf("\n");
986 }
987 #endif /* IEEE80211_DEBUG */
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