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/11.1/sys/net80211/ieee80211_input.c 300910 2016-05-28 18:49:17Z avos $");
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 m->m_flags |= M_MCAST; /* XXX M_BCAST? */
287 IEEE80211_NODE_STAT(ni, rx_mcast);
288 } else
289 IEEE80211_NODE_STAT(ni, rx_ucast);
290 m->m_pkthdr.rcvif = ifp;
291
292 if (ni->ni_vlan != 0) {
293 /* attach vlan tag */
294 m->m_pkthdr.ether_vtag = ni->ni_vlan;
295 m->m_flags |= M_VLANTAG;
296 }
297 ifp->if_input(ifp, m);
298 }
299
300 struct mbuf *
301 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen)
302 {
303 struct ieee80211_qosframe_addr4 wh;
304 struct ether_header *eh;
305 struct llc *llc;
306
307 KASSERT(hdrlen <= sizeof(wh),
308 ("hdrlen %d > max %zd", hdrlen, sizeof(wh)));
309
310 if (m->m_len < hdrlen + sizeof(*llc) &&
311 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) {
312 vap->iv_stats.is_rx_tooshort++;
313 /* XXX msg */
314 return NULL;
315 }
316 memcpy(&wh, mtod(m, caddr_t), hdrlen);
317 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen);
318 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP &&
319 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 &&
320 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 &&
321 /* NB: preserve AppleTalk frames that have a native SNAP hdr */
322 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) ||
323 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) {
324 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh));
325 llc = NULL;
326 } else {
327 m_adj(m, hdrlen - sizeof(*eh));
328 }
329 eh = mtod(m, struct ether_header *);
330 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) {
331 case IEEE80211_FC1_DIR_NODS:
332 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
333 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
334 break;
335 case IEEE80211_FC1_DIR_TODS:
336 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
337 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
338 break;
339 case IEEE80211_FC1_DIR_FROMDS:
340 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
341 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3);
342 break;
343 case IEEE80211_FC1_DIR_DSTODS:
344 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
345 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4);
346 break;
347 }
348 #ifndef __NO_STRICT_ALIGNMENT
349 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) {
350 m = ieee80211_realign(vap, m, sizeof(*eh));
351 if (m == NULL)
352 return NULL;
353 }
354 #endif /* !__NO_STRICT_ALIGNMENT */
355 if (llc != NULL) {
356 eh = mtod(m, struct ether_header *);
357 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh));
358 }
359 return m;
360 }
361
362 /*
363 * Decap a frame encapsulated in a fast-frame/A-MSDU.
364 */
365 struct mbuf *
366 ieee80211_decap1(struct mbuf *m, int *framelen)
367 {
368 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc))
369 struct ether_header *eh;
370 struct llc *llc;
371
372 /*
373 * The frame has an 802.3 header followed by an 802.2
374 * LLC header. The encapsulated frame length is in the
375 * first header type field; save that and overwrite it
376 * with the true type field found in the second. Then
377 * copy the 802.3 header up to where it belongs and
378 * adjust the mbuf contents to remove the void.
379 */
380 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL)
381 return NULL;
382 eh = mtod(m, struct ether_header *); /* 802.3 header is first */
383 llc = (struct llc *)&eh[1]; /* 802.2 header follows */
384 *framelen = ntohs(eh->ether_type) /* encap'd frame size */
385 + sizeof(struct ether_header) - sizeof(struct llc);
386 eh->ether_type = llc->llc_un.type_snap.ether_type;
387 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc),
388 sizeof(struct ether_header));
389 m_adj(m, sizeof(struct llc));
390 return m;
391 #undef FF_LLC_SIZE
392 }
393
394 /*
395 * Install received rate set information in the node's state block.
396 */
397 int
398 ieee80211_setup_rates(struct ieee80211_node *ni,
399 const uint8_t *rates, const uint8_t *xrates, int flags)
400 {
401 struct ieee80211vap *vap = ni->ni_vap;
402 struct ieee80211_rateset *rs = &ni->ni_rates;
403
404 memset(rs, 0, sizeof(*rs));
405 rs->rs_nrates = rates[1];
406 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates);
407 if (xrates != NULL) {
408 uint8_t nxrates;
409 /*
410 * Tack on 11g extended supported rate element.
411 */
412 nxrates = xrates[1];
413 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) {
414 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates;
415 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni,
416 "extended rate set too large; only using "
417 "%u of %u rates", nxrates, xrates[1]);
418 vap->iv_stats.is_rx_rstoobig++;
419 }
420 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates);
421 rs->rs_nrates += nxrates;
422 }
423 return ieee80211_fix_rate(ni, rs, flags);
424 }
425
426 /*
427 * Send a management frame error response to the specified
428 * station. If ni is associated with the station then use
429 * it; otherwise allocate a temporary node suitable for
430 * transmitting the frame and then free the reference so
431 * it will go away as soon as the frame has been transmitted.
432 */
433 void
434 ieee80211_send_error(struct ieee80211_node *ni,
435 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg)
436 {
437 struct ieee80211vap *vap = ni->ni_vap;
438 int istmp;
439
440 if (ni == vap->iv_bss) {
441 if (vap->iv_state != IEEE80211_S_RUN) {
442 /*
443 * XXX hack until we get rid of this routine.
444 * We can be called prior to the vap reaching
445 * run state under certain conditions in which
446 * case iv_bss->ni_chan will not be setup.
447 * Check for this explicitly and and just ignore
448 * the request.
449 */
450 return;
451 }
452 ni = ieee80211_tmp_node(vap, mac);
453 if (ni == NULL) {
454 /* XXX msg */
455 return;
456 }
457 istmp = 1;
458 } else
459 istmp = 0;
460 IEEE80211_SEND_MGMT(ni, subtype, arg);
461 if (istmp)
462 ieee80211_free_node(ni);
463 }
464
465 int
466 ieee80211_alloc_challenge(struct ieee80211_node *ni)
467 {
468 if (ni->ni_challenge == NULL)
469 ni->ni_challenge = (uint32_t *)
470 IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN,
471 M_80211_NODE, IEEE80211_M_NOWAIT);
472 if (ni->ni_challenge == NULL) {
473 IEEE80211_NOTE(ni->ni_vap,
474 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni,
475 "%s", "shared key challenge alloc failed");
476 /* XXX statistic */
477 }
478 return (ni->ni_challenge != NULL);
479 }
480
481 /*
482 * Parse a Beacon or ProbeResponse frame and return the
483 * useful information in an ieee80211_scanparams structure.
484 * Status is set to 0 if no problems were found; otherwise
485 * a bitmask of IEEE80211_BPARSE_* items is returned that
486 * describes the problems detected.
487 */
488 int
489 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m,
490 struct ieee80211_channel *rxchan, struct ieee80211_scanparams *scan)
491 {
492 struct ieee80211vap *vap = ni->ni_vap;
493 struct ieee80211com *ic = ni->ni_ic;
494 struct ieee80211_frame *wh;
495 uint8_t *frm, *efrm;
496
497 wh = mtod(m, struct ieee80211_frame *);
498 frm = (uint8_t *)&wh[1];
499 efrm = mtod(m, uint8_t *) + m->m_len;
500 scan->status = 0;
501 /*
502 * beacon/probe response frame format
503 * [8] time stamp
504 * [2] beacon interval
505 * [2] capability information
506 * [tlv] ssid
507 * [tlv] supported rates
508 * [tlv] country information
509 * [tlv] channel switch announcement (CSA)
510 * [tlv] parameter set (FH/DS)
511 * [tlv] erp information
512 * [tlv] extended supported rates
513 * [tlv] WME
514 * [tlv] WPA or RSN
515 * [tlv] HT capabilities
516 * [tlv] HT information
517 * [tlv] Atheros capabilities
518 * [tlv] Mesh ID
519 * [tlv] Mesh Configuration
520 */
521 IEEE80211_VERIFY_LENGTH(efrm - frm, 12,
522 return (scan->status = IEEE80211_BPARSE_BADIELEN));
523 memset(scan, 0, sizeof(*scan));
524 scan->tstamp = frm; frm += 8;
525 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2;
526 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2;
527 scan->bchan = ieee80211_chan2ieee(ic, rxchan);
528 scan->chan = scan->bchan;
529 scan->ies = frm;
530 scan->ies_len = efrm - frm;
531
532 while (efrm - frm > 1) {
533 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2,
534 return (scan->status = IEEE80211_BPARSE_BADIELEN));
535 switch (*frm) {
536 case IEEE80211_ELEMID_SSID:
537 scan->ssid = frm;
538 break;
539 case IEEE80211_ELEMID_RATES:
540 scan->rates = frm;
541 break;
542 case IEEE80211_ELEMID_COUNTRY:
543 scan->country = frm;
544 break;
545 case IEEE80211_ELEMID_CSA:
546 scan->csa = frm;
547 break;
548 case IEEE80211_ELEMID_QUIET:
549 scan->quiet = frm;
550 break;
551 case IEEE80211_ELEMID_FHPARMS:
552 if (ic->ic_phytype == IEEE80211_T_FH) {
553 scan->fhdwell = le16dec(&frm[2]);
554 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]);
555 scan->fhindex = frm[6];
556 }
557 break;
558 case IEEE80211_ELEMID_DSPARMS:
559 /*
560 * XXX hack this since depending on phytype
561 * is problematic for multi-mode devices.
562 */
563 if (ic->ic_phytype != IEEE80211_T_FH)
564 scan->chan = frm[2];
565 break;
566 case IEEE80211_ELEMID_TIM:
567 /* XXX ATIM? */
568 scan->tim = frm;
569 scan->timoff = frm - mtod(m, uint8_t *);
570 break;
571 case IEEE80211_ELEMID_IBSSPARMS:
572 case IEEE80211_ELEMID_CFPARMS:
573 case IEEE80211_ELEMID_PWRCNSTR:
574 case IEEE80211_ELEMID_BSSLOAD:
575 case IEEE80211_ELEMID_APCHANREP:
576 /* NB: avoid debugging complaints */
577 break;
578 case IEEE80211_ELEMID_XRATES:
579 scan->xrates = frm;
580 break;
581 case IEEE80211_ELEMID_ERP:
582 if (frm[1] != 1) {
583 IEEE80211_DISCARD_IE(vap,
584 IEEE80211_MSG_ELEMID, wh, "ERP",
585 "bad len %u", frm[1]);
586 vap->iv_stats.is_rx_elem_toobig++;
587 break;
588 }
589 scan->erp = frm[2] | 0x100;
590 break;
591 case IEEE80211_ELEMID_HTCAP:
592 scan->htcap = frm;
593 break;
594 case IEEE80211_ELEMID_RSN:
595 scan->rsn = frm;
596 break;
597 case IEEE80211_ELEMID_HTINFO:
598 scan->htinfo = frm;
599 break;
600 #ifdef IEEE80211_SUPPORT_MESH
601 case IEEE80211_ELEMID_MESHID:
602 scan->meshid = frm;
603 break;
604 case IEEE80211_ELEMID_MESHCONF:
605 scan->meshconf = frm;
606 break;
607 #endif
608 /* Extended capabilities; nothing handles it for now */
609 case IEEE80211_ELEMID_EXTCAP:
610 break;
611 case IEEE80211_ELEMID_VENDOR:
612 if (iswpaoui(frm))
613 scan->wpa = frm;
614 else if (iswmeparam(frm) || iswmeinfo(frm))
615 scan->wme = frm;
616 #ifdef IEEE80211_SUPPORT_SUPERG
617 else if (isatherosoui(frm))
618 scan->ath = frm;
619 #endif
620 #ifdef IEEE80211_SUPPORT_TDMA
621 else if (istdmaoui(frm))
622 scan->tdma = frm;
623 #endif
624 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
625 /*
626 * Accept pre-draft HT ie's if the
627 * standard ones have not been seen.
628 */
629 if (ishtcapoui(frm)) {
630 if (scan->htcap == NULL)
631 scan->htcap = frm;
632 } else if (ishtinfooui(frm)) {
633 if (scan->htinfo == NULL)
634 scan->htcap = frm;
635 }
636 }
637 break;
638 default:
639 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID,
640 wh, "unhandled",
641 "id %u, len %u", *frm, frm[1]);
642 vap->iv_stats.is_rx_elem_unknown++;
643 break;
644 }
645 frm += frm[1] + 2;
646 }
647 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE,
648 scan->status |= IEEE80211_BPARSE_RATES_INVALID);
649 if (scan->rates != NULL && scan->xrates != NULL) {
650 /*
651 * NB: don't process XRATES if RATES is missing. This
652 * avoids a potential null ptr deref and should be ok
653 * as the return code will already note RATES is missing
654 * (so callers shouldn't otherwise process the frame).
655 */
656 IEEE80211_VERIFY_ELEMENT(scan->xrates,
657 IEEE80211_RATE_MAXSIZE - scan->rates[1],
658 scan->status |= IEEE80211_BPARSE_XRATES_INVALID);
659 }
660 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN,
661 scan->status |= IEEE80211_BPARSE_SSID_INVALID);
662 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) {
663 /*
664 * Frame was received on a channel different from the
665 * one indicated in the DS params element id;
666 * silently discard it.
667 *
668 * NB: this can happen due to signal leakage.
669 * But we should take it for FH phy because
670 * the rssi value should be correct even for
671 * different hop pattern in FH.
672 */
673 IEEE80211_DISCARD(vap,
674 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
675 wh, NULL, "for off-channel %u (bchan=%u)",
676 scan->chan, scan->bchan);
677 vap->iv_stats.is_rx_chanmismatch++;
678 scan->status |= IEEE80211_BPARSE_OFFCHAN;
679 }
680 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval &&
681 scan->bintval <= IEEE80211_BINTVAL_MAX)) {
682 IEEE80211_DISCARD(vap,
683 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
684 wh, NULL, "bogus beacon interval (%d TU)",
685 (int) scan->bintval);
686 vap->iv_stats.is_rx_badbintval++;
687 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID;
688 }
689 if (scan->country != NULL) {
690 /*
691 * Validate we have at least enough data to extract
692 * the country code. Not sure if we should return an
693 * error instead of discarding the IE; consider this
694 * being lenient as we don't depend on the data for
695 * correct operation.
696 */
697 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t),
698 scan->country = NULL);
699 }
700 if (scan->csa != NULL) {
701 /*
702 * Validate Channel Switch Announcement; this must
703 * be the correct length or we toss the frame.
704 */
705 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t),
706 scan->status |= IEEE80211_BPARSE_CSA_INVALID);
707 }
708 /*
709 * Process HT ie's. This is complicated by our
710 * accepting both the standard ie's and the pre-draft
711 * vendor OUI ie's that some vendors still use/require.
712 */
713 if (scan->htcap != NULL) {
714 IEEE80211_VERIFY_LENGTH(scan->htcap[1],
715 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ?
716 4 + sizeof(struct ieee80211_ie_htcap)-2 :
717 sizeof(struct ieee80211_ie_htcap)-2,
718 scan->htcap = NULL);
719 }
720 if (scan->htinfo != NULL) {
721 IEEE80211_VERIFY_LENGTH(scan->htinfo[1],
722 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ?
723 4 + sizeof(struct ieee80211_ie_htinfo)-2 :
724 sizeof(struct ieee80211_ie_htinfo)-2,
725 scan->htinfo = NULL);
726 }
727 return scan->status;
728 }
729
730 /*
731 * Parse an Action frame. Return 0 on success, non-zero on failure.
732 */
733 int
734 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m)
735 {
736 struct ieee80211vap *vap = ni->ni_vap;
737 const struct ieee80211_action *ia;
738 struct ieee80211_frame *wh;
739 uint8_t *frm, *efrm;
740
741 /*
742 * action frame format:
743 * [1] category
744 * [1] action
745 * [tlv] parameters
746 */
747 wh = mtod(m, struct ieee80211_frame *);
748 frm = (u_int8_t *)&wh[1];
749 efrm = mtod(m, u_int8_t *) + m->m_len;
750 IEEE80211_VERIFY_LENGTH(efrm - frm,
751 sizeof(struct ieee80211_action), return EINVAL);
752 ia = (const struct ieee80211_action *) frm;
753
754 vap->iv_stats.is_rx_action++;
755 IEEE80211_NODE_STAT(ni, rx_action);
756
757 /* verify frame payloads but defer processing */
758 switch (ia->ia_category) {
759 case IEEE80211_ACTION_CAT_BA:
760 switch (ia->ia_action) {
761 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
762 IEEE80211_VERIFY_LENGTH(efrm - frm,
763 sizeof(struct ieee80211_action_ba_addbarequest),
764 return EINVAL);
765 break;
766 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
767 IEEE80211_VERIFY_LENGTH(efrm - frm,
768 sizeof(struct ieee80211_action_ba_addbaresponse),
769 return EINVAL);
770 break;
771 case IEEE80211_ACTION_BA_DELBA:
772 IEEE80211_VERIFY_LENGTH(efrm - frm,
773 sizeof(struct ieee80211_action_ba_delba),
774 return EINVAL);
775 break;
776 }
777 break;
778 case IEEE80211_ACTION_CAT_HT:
779 switch (ia->ia_action) {
780 case IEEE80211_ACTION_HT_TXCHWIDTH:
781 IEEE80211_VERIFY_LENGTH(efrm - frm,
782 sizeof(struct ieee80211_action_ht_txchwidth),
783 return EINVAL);
784 break;
785 case IEEE80211_ACTION_HT_MIMOPWRSAVE:
786 IEEE80211_VERIFY_LENGTH(efrm - frm,
787 sizeof(struct ieee80211_action_ht_mimopowersave),
788 return EINVAL);
789 break;
790 }
791 break;
792 #ifdef IEEE80211_SUPPORT_MESH
793 case IEEE80211_ACTION_CAT_MESH:
794 switch (ia->ia_action) {
795 case IEEE80211_ACTION_MESH_LMETRIC:
796 /*
797 * XXX: verification is true only if we are using
798 * Airtime link metric (default)
799 */
800 IEEE80211_VERIFY_LENGTH(efrm - frm,
801 sizeof(struct ieee80211_meshlmetric_ie),
802 return EINVAL);
803 break;
804 case IEEE80211_ACTION_MESH_HWMP:
805 /* verify something */
806 break;
807 case IEEE80211_ACTION_MESH_GANN:
808 IEEE80211_VERIFY_LENGTH(efrm - frm,
809 sizeof(struct ieee80211_meshgann_ie),
810 return EINVAL);
811 break;
812 case IEEE80211_ACTION_MESH_CC:
813 case IEEE80211_ACTION_MESH_MCCA_SREQ:
814 case IEEE80211_ACTION_MESH_MCCA_SREP:
815 case IEEE80211_ACTION_MESH_MCCA_AREQ:
816 case IEEE80211_ACTION_MESH_MCCA_ADVER:
817 case IEEE80211_ACTION_MESH_MCCA_TRDOWN:
818 case IEEE80211_ACTION_MESH_TBTT_REQ:
819 case IEEE80211_ACTION_MESH_TBTT_RES:
820 /* reject these early on, not implemented */
821 IEEE80211_DISCARD(vap,
822 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
823 wh, NULL, "not implemented yet, act=0x%02X",
824 ia->ia_action);
825 return EINVAL;
826 }
827 break;
828 case IEEE80211_ACTION_CAT_SELF_PROT:
829 /* If TA or RA group address discard silently */
830 if (IEEE80211_IS_MULTICAST(wh->i_addr1) ||
831 IEEE80211_IS_MULTICAST(wh->i_addr2))
832 return EINVAL;
833 /*
834 * XXX: Should we verify complete length now or it is
835 * to varying in sizes?
836 */
837 switch (ia->ia_action) {
838 case IEEE80211_ACTION_MESHPEERING_CONFIRM:
839 case IEEE80211_ACTION_MESHPEERING_CLOSE:
840 /* is not a peering candidate (yet) */
841 if (ni == vap->iv_bss)
842 return EINVAL;
843 break;
844 }
845 break;
846 #endif
847 }
848 return 0;
849 }
850
851 #ifdef IEEE80211_DEBUG
852 /*
853 * Debugging support.
854 */
855 void
856 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag,
857 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid)
858 {
859 printf("[%s] discard %s frame, ssid mismatch: ",
860 ether_sprintf(mac), tag);
861 ieee80211_print_essid(ssid + 2, ssid[1]);
862 printf("\n");
863 }
864
865 /*
866 * Return the bssid of a frame.
867 */
868 static const uint8_t *
869 ieee80211_getbssid(const struct ieee80211vap *vap,
870 const struct ieee80211_frame *wh)
871 {
872 if (vap->iv_opmode == IEEE80211_M_STA)
873 return wh->i_addr2;
874 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS)
875 return wh->i_addr1;
876 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL)
877 return wh->i_addr1;
878 return wh->i_addr3;
879 }
880
881 #include <machine/stdarg.h>
882
883 void
884 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...)
885 {
886 char buf[128]; /* XXX */
887 va_list ap;
888
889 va_start(ap, fmt);
890 vsnprintf(buf, sizeof(buf), fmt, ap);
891 va_end(ap);
892
893 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */
894 }
895
896 void
897 ieee80211_note_frame(const struct ieee80211vap *vap,
898 const struct ieee80211_frame *wh,
899 const char *fmt, ...)
900 {
901 char buf[128]; /* XXX */
902 va_list ap;
903
904 va_start(ap, fmt);
905 vsnprintf(buf, sizeof(buf), fmt, ap);
906 va_end(ap);
907 if_printf(vap->iv_ifp, "[%s] %s\n",
908 ether_sprintf(ieee80211_getbssid(vap, wh)), buf);
909 }
910
911 void
912 ieee80211_note_mac(const struct ieee80211vap *vap,
913 const uint8_t mac[IEEE80211_ADDR_LEN],
914 const char *fmt, ...)
915 {
916 char buf[128]; /* XXX */
917 va_list ap;
918
919 va_start(ap, fmt);
920 vsnprintf(buf, sizeof(buf), fmt, ap);
921 va_end(ap);
922 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf);
923 }
924
925 void
926 ieee80211_discard_frame(const struct ieee80211vap *vap,
927 const struct ieee80211_frame *wh,
928 const char *type, const char *fmt, ...)
929 {
930 va_list ap;
931
932 if_printf(vap->iv_ifp, "[%s] discard ",
933 ether_sprintf(ieee80211_getbssid(vap, wh)));
934 printf("%s frame, ", type != NULL ? type :
935 ieee80211_mgt_subtype_name(wh->i_fc[0]));
936 va_start(ap, fmt);
937 vprintf(fmt, ap);
938 va_end(ap);
939 printf("\n");
940 }
941
942 void
943 ieee80211_discard_ie(const struct ieee80211vap *vap,
944 const struct ieee80211_frame *wh,
945 const char *type, const char *fmt, ...)
946 {
947 va_list ap;
948
949 if_printf(vap->iv_ifp, "[%s] discard ",
950 ether_sprintf(ieee80211_getbssid(vap, wh)));
951 if (type != NULL)
952 printf("%s information element, ", type);
953 else
954 printf("information element, ");
955 va_start(ap, fmt);
956 vprintf(fmt, ap);
957 va_end(ap);
958 printf("\n");
959 }
960
961 void
962 ieee80211_discard_mac(const struct ieee80211vap *vap,
963 const uint8_t mac[IEEE80211_ADDR_LEN],
964 const char *type, const char *fmt, ...)
965 {
966 va_list ap;
967
968 if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac));
969 if (type != NULL)
970 printf("%s frame, ", type);
971 else
972 printf("frame, ");
973 va_start(ap, fmt);
974 vprintf(fmt, ap);
975 va_end(ap);
976 printf("\n");
977 }
978 #endif /* IEEE80211_DEBUG */
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