1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2001 Atsushi Onoe
5 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include "opt_wlan.h"
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/mbuf.h>
37 #include <sys/malloc.h>
38 #include <sys/endian.h>
39 #include <sys/kernel.h>
40
41 #include <sys/socket.h>
42
43 #include <net/ethernet.h>
44 #include <net/if.h>
45 #include <net/if_var.h>
46 #include <net/if_llc.h>
47 #include <net/if_media.h>
48 #include <net/if_vlan_var.h>
49
50 #include <net80211/ieee80211_var.h>
51 #include <net80211/ieee80211_input.h>
52 #ifdef IEEE80211_SUPPORT_MESH
53 #include <net80211/ieee80211_mesh.h>
54 #endif
55
56 #include <net/bpf.h>
57
58 #ifdef INET
59 #include <netinet/in.h>
60 #include <net/ethernet.h>
61 #endif
62
63 static void
64 ieee80211_process_mimo(struct ieee80211_node *ni, struct ieee80211_rx_stats *rx)
65 {
66 int i;
67
68 /* Verify the required MIMO bits are set */
69 if ((rx->r_flags & (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI)) !=
70 (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI))
71 return;
72
73 /* XXX This assumes the MIMO radios have both ctl and ext chains */
74 for (i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) {
75 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ctl[i], rx->c_rssi_ctl[i]);
76 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ext[i], rx->c_rssi_ext[i]);
77 }
78
79 /* XXX This also assumes the MIMO radios have both ctl and ext chains */
80 for(i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) {
81 ni->ni_mimo_noise_ctl[i] = rx->c_nf_ctl[i];
82 ni->ni_mimo_noise_ext[i] = rx->c_nf_ext[i];
83 }
84 ni->ni_mimo_chains = rx->c_chain;
85 }
86
87 int
88 ieee80211_input_mimo(struct ieee80211_node *ni, struct mbuf *m)
89 {
90 struct ieee80211_rx_stats rxs;
91
92 /* try to read stats from mbuf */
93 bzero(&rxs, sizeof(rxs));
94 if (ieee80211_get_rx_params(m, &rxs) != 0)
95 return (-1);
96
97 /* XXX should assert IEEE80211_R_NF and IEEE80211_R_RSSI are set */
98 ieee80211_process_mimo(ni, &rxs);
99
100 //return ieee80211_input(ni, m, rx->rssi, rx->nf);
101 return ni->ni_vap->iv_input(ni, m, &rxs, rxs.c_rssi, rxs.c_nf);
102 }
103
104 int
105 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf)
106 {
107 struct ieee80211_rx_stats rx;
108
109 rx.r_flags = IEEE80211_R_NF | IEEE80211_R_RSSI;
110 rx.c_nf = nf;
111 rx.c_rssi = rssi;
112
113 if (!ieee80211_add_rx_params(m, &rx))
114 return (-1);
115
116 return ieee80211_input_mimo_all(ic, m);
117 }
118
119 int
120 ieee80211_input_mimo_all(struct ieee80211com *ic, struct mbuf *m)
121 {
122 struct ieee80211vap *vap;
123 int type = -1;
124
125 m->m_flags |= M_BCAST; /* NB: mark for bpf tap'ing */
126
127 /* XXX locking */
128 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
129 struct ieee80211_node *ni;
130 struct mbuf *mcopy;
131
132 /* NB: could check for IFF_UP but this is cheaper */
133 if (vap->iv_state == IEEE80211_S_INIT)
134 continue;
135 /*
136 * WDS vap's only receive directed traffic from the
137 * station at the ``far end''. That traffic should
138 * be passed through the AP vap the station is associated
139 * to--so don't spam them with mcast frames.
140 */
141 if (vap->iv_opmode == IEEE80211_M_WDS)
142 continue;
143 if (TAILQ_NEXT(vap, iv_next) != NULL) {
144 /*
145 * Packet contents are changed by ieee80211_decap
146 * so do a deep copy of the packet.
147 * NB: tags are copied too.
148 */
149 mcopy = m_dup(m, IEEE80211_M_NOWAIT);
150 if (mcopy == NULL) {
151 /* XXX stat+msg */
152 continue;
153 }
154 } else {
155 mcopy = m;
156 m = NULL;
157 }
158 ni = ieee80211_ref_node(vap->iv_bss);
159 type = ieee80211_input_mimo(ni, mcopy);
160 ieee80211_free_node(ni);
161 }
162 if (m != NULL) /* no vaps, reclaim mbuf */
163 m_freem(m);
164 return type;
165 }
166
167 /*
168 * This function reassembles fragments.
169 *
170 * XXX should handle 3 concurrent reassemblies per-spec.
171 */
172 struct mbuf *
173 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace,
174 int has_decrypted)
175 {
176 struct ieee80211vap *vap = ni->ni_vap;
177 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
178 struct ieee80211_frame *lwh;
179 uint16_t rxseq;
180 uint8_t fragno;
181 uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG;
182 struct mbuf *mfrag;
183
184 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?"));
185
186 rxseq = le16toh(*(uint16_t *)wh->i_seq);
187 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK;
188
189 /* Quick way out, if there's nothing to defragment */
190 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL)
191 return m;
192
193 /* Temporarily set flag to remember if fragment was encrypted. */
194 /* XXX use a non-packet altering storage for this in the future. */
195 if (has_decrypted)
196 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED;
197
198 /*
199 * Remove frag to insure it doesn't get reaped by timer.
200 */
201 if (ni->ni_table == NULL) {
202 /*
203 * Should never happen. If the node is orphaned (not in
204 * the table) then input packets should not reach here.
205 * Otherwise, a concurrent request that yanks the table
206 * should be blocked by other interlocking and/or by first
207 * shutting the driver down. Regardless, be defensive
208 * here and just bail
209 */
210 /* XXX need msg+stat */
211 m_freem(m);
212 return NULL;
213 }
214 IEEE80211_NODE_LOCK(ni->ni_table);
215 mfrag = ni->ni_rxfrag[0];
216 ni->ni_rxfrag[0] = NULL;
217 IEEE80211_NODE_UNLOCK(ni->ni_table);
218
219 /*
220 * Validate new fragment is in order and
221 * related to the previous ones.
222 */
223 if (mfrag != NULL) {
224 uint16_t last_rxseq;
225
226 lwh = mtod(mfrag, struct ieee80211_frame *);
227 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq);
228 /*
229 * NB: check seq # and frag together. Also check that both
230 * fragments are plaintext or that both are encrypted.
231 */
232 if (rxseq == last_rxseq+1 &&
233 IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) &&
234 IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2) &&
235 !((wh->i_fc[1] ^ lwh->i_fc[1]) & IEEE80211_FC1_PROTECTED)) {
236 /* XXX clear MORE_FRAG bit? */
237 /* track last seqnum and fragno */
238 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq;
239
240 m_adj(m, hdrspace); /* strip header */
241 m_catpkt(mfrag, m); /* concatenate */
242 } else {
243 /*
244 * Unrelated fragment or no space for it,
245 * clear current fragments.
246 */
247 m_freem(mfrag);
248 mfrag = NULL;
249 }
250 }
251
252 if (mfrag == NULL) {
253 if (fragno != 0) { /* !first fragment, discard */
254 vap->iv_stats.is_rx_defrag++;
255 IEEE80211_NODE_STAT(ni, rx_defrag);
256 m_freem(m);
257 return NULL;
258 }
259 mfrag = m;
260 }
261 if (more_frag) { /* more to come, save */
262 ni->ni_rxfragstamp = ticks;
263 ni->ni_rxfrag[0] = mfrag;
264 mfrag = NULL;
265 }
266 /* Remember to clear protected flag that was temporarily set. */
267 if (mfrag != NULL) {
268 wh = mtod(mfrag, struct ieee80211_frame *);
269 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
270 }
271 return mfrag;
272 }
273
274 void
275 ieee80211_deliver_data(struct ieee80211vap *vap,
276 struct ieee80211_node *ni, struct mbuf *m)
277 {
278 struct ether_header *eh = mtod(m, struct ether_header *);
279 struct ifnet *ifp = vap->iv_ifp;
280
281 /* clear driver/net80211 flags before passing up */
282 m->m_flags &= ~(M_MCAST | M_BCAST);
283 m_clrprotoflags(m);
284
285 /* NB: see hostap_deliver_data, this path doesn't handle hostap */
286 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap"));
287 /*
288 * Do accounting.
289 */
290 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
291 IEEE80211_NODE_STAT(ni, rx_data);
292 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
293 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
294 if (ETHER_IS_BROADCAST(eh->ether_dhost))
295 m->m_flags |= M_BCAST;
296 else
297 m->m_flags |= M_MCAST;
298 IEEE80211_NODE_STAT(ni, rx_mcast);
299 } else
300 IEEE80211_NODE_STAT(ni, rx_ucast);
301 m->m_pkthdr.rcvif = ifp;
302
303 if (ni->ni_vlan != 0) {
304 /* attach vlan tag */
305 m->m_pkthdr.ether_vtag = ni->ni_vlan;
306 m->m_flags |= M_VLANTAG;
307 }
308 ifp->if_input(ifp, m);
309 }
310
311 struct mbuf *
312 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen,
313 uint8_t qos)
314 {
315 struct ieee80211_qosframe_addr4 wh;
316 struct ether_header *eh;
317 struct llc *llc;
318
319 KASSERT(hdrlen <= sizeof(wh),
320 ("hdrlen %d > max %zd", hdrlen, sizeof(wh)));
321
322 if (m->m_len < hdrlen + sizeof(*llc) &&
323 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) {
324 vap->iv_stats.is_rx_tooshort++;
325 /* XXX msg */
326 return NULL;
327 }
328 memcpy(&wh, mtod(m, caddr_t), hdrlen);
329 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen);
330 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP &&
331 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 &&
332 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 &&
333 /* NB: preserve AppleTalk frames that have a native SNAP hdr */
334 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) ||
335 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX)) &&
336 /* Do not want to touch A-MSDU frames. */
337 !(qos & IEEE80211_QOS_AMSDU)) {
338 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh));
339 llc = NULL;
340 } else {
341 m_adj(m, hdrlen - sizeof(*eh));
342 }
343 eh = mtod(m, struct ether_header *);
344 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) {
345 case IEEE80211_FC1_DIR_NODS:
346 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
347 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
348 break;
349 case IEEE80211_FC1_DIR_TODS:
350 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
351 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
352 break;
353 case IEEE80211_FC1_DIR_FROMDS:
354 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
355 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3);
356 break;
357 case IEEE80211_FC1_DIR_DSTODS:
358 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
359 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4);
360 break;
361 }
362 #ifndef __NO_STRICT_ALIGNMENT
363 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) {
364 m = ieee80211_realign(vap, m, sizeof(*eh));
365 if (m == NULL)
366 return NULL;
367 }
368 #endif /* !__NO_STRICT_ALIGNMENT */
369 if (llc != NULL) {
370 eh = mtod(m, struct ether_header *);
371 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh));
372 }
373 return m;
374 }
375
376 /*
377 * Decap a frame encapsulated in a fast-frame/A-MSDU.
378 */
379 struct mbuf *
380 ieee80211_decap1(struct mbuf *m, int *framelen)
381 {
382 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc))
383 struct ether_header *eh;
384 struct llc *llc;
385 const uint8_t llc_hdr_mac[ETHER_ADDR_LEN] = {
386 /* MAC address matching the 802.2 LLC header */
387 LLC_SNAP_LSAP, LLC_SNAP_LSAP, LLC_UI, 0, 0, 0
388 };
389
390 /*
391 * The frame has an 802.3 header followed by an 802.2
392 * LLC header. The encapsulated frame length is in the
393 * first header type field; save that and overwrite it
394 * with the true type field found in the second. Then
395 * copy the 802.3 header up to where it belongs and
396 * adjust the mbuf contents to remove the void.
397 */
398 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL)
399 return NULL;
400 eh = mtod(m, struct ether_header *); /* 802.3 header is first */
401
402 /*
403 * Detect possible attack where a single 802.11 frame is processed
404 * as an A-MSDU frame due to an adversary setting the A-MSDU present
405 * bit in the 802.11 QoS header. [FragAttacks]
406 */
407 if (memcmp(eh->ether_dhost, llc_hdr_mac, ETHER_ADDR_LEN) == 0)
408 return NULL;
409
410 llc = (struct llc *)&eh[1]; /* 802.2 header follows */
411 *framelen = ntohs(eh->ether_type) /* encap'd frame size */
412 + sizeof(struct ether_header) - sizeof(struct llc);
413 eh->ether_type = llc->llc_un.type_snap.ether_type;
414 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc),
415 sizeof(struct ether_header));
416 m_adj(m, sizeof(struct llc));
417 return m;
418 #undef FF_LLC_SIZE
419 }
420
421 /*
422 * Install received rate set information in the node's state block.
423 */
424 int
425 ieee80211_setup_rates(struct ieee80211_node *ni,
426 const uint8_t *rates, const uint8_t *xrates, int flags)
427 {
428 struct ieee80211vap *vap = ni->ni_vap;
429 struct ieee80211_rateset *rs = &ni->ni_rates;
430
431 memset(rs, 0, sizeof(*rs));
432 rs->rs_nrates = rates[1];
433 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates);
434 if (xrates != NULL) {
435 uint8_t nxrates;
436 /*
437 * Tack on 11g extended supported rate element.
438 */
439 nxrates = xrates[1];
440 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) {
441 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates;
442 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni,
443 "extended rate set too large; only using "
444 "%u of %u rates", nxrates, xrates[1]);
445 vap->iv_stats.is_rx_rstoobig++;
446 }
447 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates);
448 rs->rs_nrates += nxrates;
449 }
450 return ieee80211_fix_rate(ni, rs, flags);
451 }
452
453 /*
454 * Send a management frame error response to the specified
455 * station. If ni is associated with the station then use
456 * it; otherwise allocate a temporary node suitable for
457 * transmitting the frame and then free the reference so
458 * it will go away as soon as the frame has been transmitted.
459 */
460 void
461 ieee80211_send_error(struct ieee80211_node *ni,
462 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg)
463 {
464 struct ieee80211vap *vap = ni->ni_vap;
465 int istmp;
466
467 if (ni == vap->iv_bss) {
468 if (vap->iv_state != IEEE80211_S_RUN) {
469 /*
470 * XXX hack until we get rid of this routine.
471 * We can be called prior to the vap reaching
472 * run state under certain conditions in which
473 * case iv_bss->ni_chan will not be setup.
474 * Check for this explicitly and and just ignore
475 * the request.
476 */
477 return;
478 }
479 ni = ieee80211_tmp_node(vap, mac);
480 if (ni == NULL) {
481 /* XXX msg */
482 return;
483 }
484 istmp = 1;
485 } else
486 istmp = 0;
487 IEEE80211_SEND_MGMT(ni, subtype, arg);
488 if (istmp)
489 ieee80211_free_node(ni);
490 }
491
492 int
493 ieee80211_alloc_challenge(struct ieee80211_node *ni)
494 {
495 if (ni->ni_challenge == NULL)
496 ni->ni_challenge = (uint32_t *)
497 IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN,
498 M_80211_NODE, IEEE80211_M_NOWAIT);
499 if (ni->ni_challenge == NULL) {
500 IEEE80211_NOTE(ni->ni_vap,
501 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni,
502 "%s", "shared key challenge alloc failed");
503 /* XXX statistic */
504 }
505 return (ni->ni_challenge != NULL);
506 }
507
508 /*
509 * Parse a Beacon or ProbeResponse frame and return the
510 * useful information in an ieee80211_scanparams structure.
511 * Status is set to 0 if no problems were found; otherwise
512 * a bitmask of IEEE80211_BPARSE_* items is returned that
513 * describes the problems detected.
514 */
515 int
516 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m,
517 struct ieee80211_channel *rxchan, struct ieee80211_scanparams *scan)
518 {
519 struct ieee80211vap *vap = ni->ni_vap;
520 struct ieee80211com *ic = ni->ni_ic;
521 struct ieee80211_frame *wh;
522 uint8_t *frm, *efrm;
523
524 wh = mtod(m, struct ieee80211_frame *);
525 frm = (uint8_t *)&wh[1];
526 efrm = mtod(m, uint8_t *) + m->m_len;
527 scan->status = 0;
528 /*
529 * beacon/probe response frame format
530 *
531 * XXX Update from 802.11-2012 - eg where HT is
532 * [8] time stamp
533 * [2] beacon interval
534 * [2] capability information
535 * [tlv] ssid
536 * [tlv] supported rates
537 * [tlv] country information
538 * [tlv] channel switch announcement (CSA)
539 * [tlv] parameter set (FH/DS)
540 * [tlv] erp information
541 * [tlv] extended supported rates
542 * [tlv] WME
543 * [tlv] WPA or RSN
544 * [tlv] HT capabilities
545 * [tlv] HT information
546 * [tlv] VHT capabilities
547 * [tlv] VHT information
548 * [tlv] Atheros capabilities
549 * [tlv] Mesh ID
550 * [tlv] Mesh Configuration
551 */
552 IEEE80211_VERIFY_LENGTH(efrm - frm, 12,
553 return (scan->status = IEEE80211_BPARSE_BADIELEN));
554 memset(scan, 0, sizeof(*scan));
555 scan->tstamp = frm; frm += 8;
556 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2;
557 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2;
558 scan->bchan = ieee80211_chan2ieee(ic, rxchan);
559 scan->chan = scan->bchan;
560 scan->ies = frm;
561 scan->ies_len = efrm - frm;
562
563 while (efrm - frm > 1) {
564 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2,
565 return (scan->status = IEEE80211_BPARSE_BADIELEN));
566 switch (*frm) {
567 case IEEE80211_ELEMID_SSID:
568 scan->ssid = frm;
569 break;
570 case IEEE80211_ELEMID_RATES:
571 scan->rates = frm;
572 break;
573 case IEEE80211_ELEMID_COUNTRY:
574 scan->country = frm;
575 break;
576 case IEEE80211_ELEMID_CSA:
577 scan->csa = frm;
578 break;
579 case IEEE80211_ELEMID_QUIET:
580 scan->quiet = frm;
581 break;
582 case IEEE80211_ELEMID_FHPARMS:
583 if (ic->ic_phytype == IEEE80211_T_FH) {
584 scan->fhdwell = le16dec(&frm[2]);
585 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]);
586 scan->fhindex = frm[6];
587 }
588 break;
589 case IEEE80211_ELEMID_DSPARMS:
590 /*
591 * XXX hack this since depending on phytype
592 * is problematic for multi-mode devices.
593 */
594 if (ic->ic_phytype != IEEE80211_T_FH)
595 scan->chan = frm[2];
596 break;
597 case IEEE80211_ELEMID_TIM:
598 /* XXX ATIM? */
599 scan->tim = frm;
600 scan->timoff = frm - mtod(m, uint8_t *);
601 break;
602 case IEEE80211_ELEMID_IBSSPARMS:
603 case IEEE80211_ELEMID_CFPARMS:
604 case IEEE80211_ELEMID_PWRCNSTR:
605 case IEEE80211_ELEMID_BSSLOAD:
606 case IEEE80211_ELEMID_APCHANREP:
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_VHT_CAP:
626 scan->vhtcap = frm;
627 break;
628 case IEEE80211_ELEMID_VHT_OPMODE:
629 scan->vhtopmode = frm;
630 break;
631 case IEEE80211_ELEMID_RSN:
632 scan->rsn = frm;
633 break;
634 case IEEE80211_ELEMID_HTINFO:
635 scan->htinfo = frm;
636 break;
637 #ifdef IEEE80211_SUPPORT_MESH
638 case IEEE80211_ELEMID_MESHID:
639 scan->meshid = frm;
640 break;
641 case IEEE80211_ELEMID_MESHCONF:
642 scan->meshconf = frm;
643 break;
644 #endif
645 /* Extended capabilities; nothing handles it for now */
646 case IEEE80211_ELEMID_EXTCAP:
647 break;
648 case IEEE80211_ELEMID_VENDOR:
649 if (iswpaoui(frm))
650 scan->wpa = frm;
651 else if (iswmeparam(frm) || iswmeinfo(frm))
652 scan->wme = frm;
653 #ifdef IEEE80211_SUPPORT_SUPERG
654 else if (isatherosoui(frm))
655 scan->ath = frm;
656 #endif
657 #ifdef IEEE80211_SUPPORT_TDMA
658 else if (istdmaoui(frm))
659 scan->tdma = frm;
660 #endif
661 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
662 /*
663 * Accept pre-draft HT ie's if the
664 * standard ones have not been seen.
665 */
666 if (ishtcapoui(frm)) {
667 if (scan->htcap == NULL)
668 scan->htcap = frm;
669 } else if (ishtinfooui(frm)) {
670 if (scan->htinfo == NULL)
671 scan->htcap = frm;
672 }
673 }
674 break;
675 default:
676 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID,
677 wh, "unhandled",
678 "id %u, len %u", *frm, frm[1]);
679 vap->iv_stats.is_rx_elem_unknown++;
680 break;
681 }
682 frm += frm[1] + 2;
683 }
684 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE,
685 scan->status |= IEEE80211_BPARSE_RATES_INVALID);
686 if (scan->rates != NULL && scan->xrates != NULL) {
687 /*
688 * NB: don't process XRATES if RATES is missing. This
689 * avoids a potential null ptr deref and should be ok
690 * as the return code will already note RATES is missing
691 * (so callers shouldn't otherwise process the frame).
692 */
693 IEEE80211_VERIFY_ELEMENT(scan->xrates,
694 IEEE80211_RATE_MAXSIZE - scan->rates[1],
695 scan->status |= IEEE80211_BPARSE_XRATES_INVALID);
696 }
697 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN,
698 scan->status |= IEEE80211_BPARSE_SSID_INVALID);
699 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) {
700 /*
701 * Frame was received on a channel different from the
702 * one indicated in the DS params element id;
703 * silently discard it.
704 *
705 * NB: this can happen due to signal leakage.
706 * But we should take it for FH phy because
707 * the rssi value should be correct even for
708 * different hop pattern in FH.
709 */
710 IEEE80211_DISCARD(vap,
711 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
712 wh, NULL, "for off-channel %u (bchan=%u)",
713 scan->chan, scan->bchan);
714 vap->iv_stats.is_rx_chanmismatch++;
715 scan->status |= IEEE80211_BPARSE_OFFCHAN;
716 }
717 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval &&
718 scan->bintval <= IEEE80211_BINTVAL_MAX)) {
719 IEEE80211_DISCARD(vap,
720 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
721 wh, NULL, "bogus beacon interval (%d TU)",
722 (int) scan->bintval);
723 vap->iv_stats.is_rx_badbintval++;
724 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID;
725 }
726 if (scan->country != NULL) {
727 /*
728 * Validate we have at least enough data to extract
729 * the country code. Not sure if we should return an
730 * error instead of discarding the IE; consider this
731 * being lenient as we don't depend on the data for
732 * correct operation.
733 */
734 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t),
735 scan->country = NULL);
736 }
737 if (scan->csa != NULL) {
738 /*
739 * Validate Channel Switch Announcement; this must
740 * be the correct length or we toss the frame.
741 */
742 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t),
743 scan->status |= IEEE80211_BPARSE_CSA_INVALID);
744 }
745 #ifdef IEEE80211_SUPPORT_MESH
746 if (scan->meshid != NULL) {
747 IEEE80211_VERIFY_ELEMENT(scan->meshid, IEEE80211_MESHID_LEN,
748 scan->status |= IEEE80211_BPARSE_RATES_INVALID);
749 }
750 #endif
751 /*
752 * Process HT ie's. This is complicated by our
753 * accepting both the standard ie's and the pre-draft
754 * vendor OUI ie's that some vendors still use/require.
755 */
756 if (scan->htcap != NULL) {
757 IEEE80211_VERIFY_LENGTH(scan->htcap[1],
758 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ?
759 4 + sizeof(struct ieee80211_ie_htcap)-2 :
760 sizeof(struct ieee80211_ie_htcap)-2,
761 scan->htcap = NULL);
762 }
763 if (scan->htinfo != NULL) {
764 IEEE80211_VERIFY_LENGTH(scan->htinfo[1],
765 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ?
766 4 + sizeof(struct ieee80211_ie_htinfo)-2 :
767 sizeof(struct ieee80211_ie_htinfo)-2,
768 scan->htinfo = NULL);
769 }
770
771 /* Process VHT IEs */
772 if (scan->vhtcap != NULL) {
773 IEEE80211_VERIFY_LENGTH(scan->vhtcap[1],
774 sizeof(struct ieee80211_ie_vhtcap) - 2,
775 scan->vhtcap = NULL);
776 }
777 if (scan->vhtopmode != NULL) {
778 IEEE80211_VERIFY_LENGTH(scan->vhtopmode[1],
779 sizeof(struct ieee80211_ie_vht_operation) - 2,
780 scan->vhtopmode = NULL);
781 }
782
783 return scan->status;
784 }
785
786 /*
787 * Parse an Action frame. Return 0 on success, non-zero on failure.
788 */
789 int
790 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m)
791 {
792 struct ieee80211vap *vap = ni->ni_vap;
793 const struct ieee80211_action *ia;
794 struct ieee80211_frame *wh;
795 uint8_t *frm, *efrm;
796
797 /*
798 * action frame format:
799 * [1] category
800 * [1] action
801 * [tlv] parameters
802 */
803 wh = mtod(m, struct ieee80211_frame *);
804 frm = (u_int8_t *)&wh[1];
805 efrm = mtod(m, u_int8_t *) + m->m_len;
806 IEEE80211_VERIFY_LENGTH(efrm - frm,
807 sizeof(struct ieee80211_action), return EINVAL);
808 ia = (const struct ieee80211_action *) frm;
809
810 vap->iv_stats.is_rx_action++;
811 IEEE80211_NODE_STAT(ni, rx_action);
812
813 /* verify frame payloads but defer processing */
814 switch (ia->ia_category) {
815 case IEEE80211_ACTION_CAT_BA:
816 switch (ia->ia_action) {
817 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
818 IEEE80211_VERIFY_LENGTH(efrm - frm,
819 sizeof(struct ieee80211_action_ba_addbarequest),
820 return EINVAL);
821 break;
822 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
823 IEEE80211_VERIFY_LENGTH(efrm - frm,
824 sizeof(struct ieee80211_action_ba_addbaresponse),
825 return EINVAL);
826 break;
827 case IEEE80211_ACTION_BA_DELBA:
828 IEEE80211_VERIFY_LENGTH(efrm - frm,
829 sizeof(struct ieee80211_action_ba_delba),
830 return EINVAL);
831 break;
832 }
833 break;
834 case IEEE80211_ACTION_CAT_HT:
835 switch (ia->ia_action) {
836 case IEEE80211_ACTION_HT_TXCHWIDTH:
837 IEEE80211_VERIFY_LENGTH(efrm - frm,
838 sizeof(struct ieee80211_action_ht_txchwidth),
839 return EINVAL);
840 break;
841 case IEEE80211_ACTION_HT_MIMOPWRSAVE:
842 IEEE80211_VERIFY_LENGTH(efrm - frm,
843 sizeof(struct ieee80211_action_ht_mimopowersave),
844 return EINVAL);
845 break;
846 }
847 break;
848 #ifdef IEEE80211_SUPPORT_MESH
849 case IEEE80211_ACTION_CAT_MESH:
850 switch (ia->ia_action) {
851 case IEEE80211_ACTION_MESH_LMETRIC:
852 /*
853 * XXX: verification is true only if we are using
854 * Airtime link metric (default)
855 */
856 IEEE80211_VERIFY_LENGTH(efrm - frm,
857 sizeof(struct ieee80211_meshlmetric_ie),
858 return EINVAL);
859 break;
860 case IEEE80211_ACTION_MESH_HWMP:
861 /* verify something */
862 break;
863 case IEEE80211_ACTION_MESH_GANN:
864 IEEE80211_VERIFY_LENGTH(efrm - frm,
865 sizeof(struct ieee80211_meshgann_ie),
866 return EINVAL);
867 break;
868 case IEEE80211_ACTION_MESH_CC:
869 case IEEE80211_ACTION_MESH_MCCA_SREQ:
870 case IEEE80211_ACTION_MESH_MCCA_SREP:
871 case IEEE80211_ACTION_MESH_MCCA_AREQ:
872 case IEEE80211_ACTION_MESH_MCCA_ADVER:
873 case IEEE80211_ACTION_MESH_MCCA_TRDOWN:
874 case IEEE80211_ACTION_MESH_TBTT_REQ:
875 case IEEE80211_ACTION_MESH_TBTT_RES:
876 /* reject these early on, not implemented */
877 IEEE80211_DISCARD(vap,
878 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
879 wh, NULL, "not implemented yet, act=0x%02X",
880 ia->ia_action);
881 return EINVAL;
882 }
883 break;
884 case IEEE80211_ACTION_CAT_SELF_PROT:
885 /* If TA or RA group address discard silently */
886 if (IEEE80211_IS_MULTICAST(wh->i_addr1) ||
887 IEEE80211_IS_MULTICAST(wh->i_addr2))
888 return EINVAL;
889 /*
890 * XXX: Should we verify complete length now or it is
891 * to varying in sizes?
892 */
893 switch (ia->ia_action) {
894 case IEEE80211_ACTION_MESHPEERING_CONFIRM:
895 case IEEE80211_ACTION_MESHPEERING_CLOSE:
896 /* is not a peering candidate (yet) */
897 if (ni == vap->iv_bss)
898 return EINVAL;
899 break;
900 }
901 break;
902 #endif
903 case IEEE80211_ACTION_CAT_VHT:
904 printf("%s: TODO: VHT handling!\n", __func__);
905 break;
906 }
907 return 0;
908 }
909
910 #ifdef IEEE80211_DEBUG
911 /*
912 * Debugging support.
913 */
914 void
915 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag,
916 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid)
917 {
918 printf("[%s] discard %s frame, ssid mismatch: ",
919 ether_sprintf(mac), tag);
920 ieee80211_print_essid(ssid + 2, ssid[1]);
921 printf("\n");
922 }
923
924 /*
925 * Return the bssid of a frame.
926 */
927 static const uint8_t *
928 ieee80211_getbssid(const struct ieee80211vap *vap,
929 const struct ieee80211_frame *wh)
930 {
931 if (vap->iv_opmode == IEEE80211_M_STA)
932 return wh->i_addr2;
933 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS)
934 return wh->i_addr1;
935 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL)
936 return wh->i_addr1;
937 return wh->i_addr3;
938 }
939
940 #include <machine/stdarg.h>
941
942 void
943 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...)
944 {
945 char buf[256]; /* XXX */
946 va_list ap;
947 int len;
948
949 va_start(ap, fmt);
950 len = vsnprintf(buf, sizeof(buf), fmt, ap);
951 va_end(ap);
952
953 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */
954
955 if (len >= sizeof(buf))
956 printf("%s: XXX buffer too small: len = %d\n", __func__, len);
957 }
958
959 void
960 ieee80211_note_frame(const struct ieee80211vap *vap,
961 const struct ieee80211_frame *wh,
962 const char *fmt, ...)
963 {
964 char buf[256]; /* XXX */
965 va_list ap;
966 int len;
967
968 va_start(ap, fmt);
969 len = vsnprintf(buf, sizeof(buf), fmt, ap);
970 va_end(ap);
971 if_printf(vap->iv_ifp, "[%s] %s\n",
972 ether_sprintf(ieee80211_getbssid(vap, wh)), buf);
973
974 if (len >= sizeof(buf))
975 printf("%s: XXX buffer too small: len = %d\n", __func__, len);
976 }
977
978 void
979 ieee80211_note_mac(const struct ieee80211vap *vap,
980 const uint8_t mac[IEEE80211_ADDR_LEN],
981 const char *fmt, ...)
982 {
983 char buf[256]; /* XXX */
984 va_list ap;
985 int len;
986
987 va_start(ap, fmt);
988 len = vsnprintf(buf, sizeof(buf), fmt, ap);
989 va_end(ap);
990 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf);
991
992 if (len >= sizeof(buf))
993 printf("%s: XXX buffer too small: len = %d\n", __func__, len);
994 }
995
996 void
997 ieee80211_discard_frame(const struct ieee80211vap *vap,
998 const struct ieee80211_frame *wh,
999 const char *type, const char *fmt, ...)
1000 {
1001 char buf[256]; /* XXX */
1002 va_list ap;
1003 int len;
1004
1005 va_start(ap, fmt);
1006 len = vsnprintf(buf, sizeof(buf), fmt, ap);
1007 va_end(ap);
1008
1009 if_printf(vap->iv_ifp, "[%s] discard %s frame, %s\n",
1010 ether_sprintf(ieee80211_getbssid(vap, wh)),
1011 type != NULL ? type : ieee80211_mgt_subtype_name(wh->i_fc[0]),
1012 buf);
1013
1014 if (len >= sizeof(buf))
1015 printf("%s: XXX buffer too small: len = %d\n", __func__, len);
1016 }
1017
1018 void
1019 ieee80211_discard_ie(const struct ieee80211vap *vap,
1020 const struct ieee80211_frame *wh,
1021 const char *type, const char *fmt, ...)
1022 {
1023 char buf[256]; /* XXX */
1024 va_list ap;
1025 int len;
1026
1027 va_start(ap, fmt);
1028 len = vsnprintf(buf, sizeof(buf), fmt, ap);
1029 va_end(ap);
1030
1031 if_printf(vap->iv_ifp, "[%s] discard%s%s information element, %s\n",
1032 ether_sprintf(ieee80211_getbssid(vap, wh)),
1033 type != NULL ? " " : "", type != NULL ? type : "", buf);
1034
1035 if (len >= sizeof(buf))
1036 printf("%s: XXX buffer too small: len = %d\n", __func__, len);
1037 }
1038
1039 void
1040 ieee80211_discard_mac(const struct ieee80211vap *vap,
1041 const uint8_t mac[IEEE80211_ADDR_LEN],
1042 const char *type, const char *fmt, ...)
1043 {
1044 char buf[256]; /* XXX */
1045 va_list ap;
1046 int len;
1047
1048 va_start(ap, fmt);
1049 len = vsnprintf(buf, sizeof(buf), fmt, ap);
1050 va_end(ap);
1051
1052 if_printf(vap->iv_ifp, "[%s] discard%s%s frame, %s\n",
1053 ether_sprintf(mac),
1054 type != NULL ? " " : "", type != NULL ? type : "", buf);
1055
1056 if (len >= sizeof(buf))
1057 printf("%s: XXX buffer too small: len = %d\n", __func__, len);
1058 }
1059 #endif /* IEEE80211_DEBUG */
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