1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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 #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_private.h>
47 #include <net/if_vlan_var.h>
48
49 #include <net80211/ieee80211_var.h>
50 #include <net80211/ieee80211_input.h>
51 #ifdef IEEE80211_SUPPORT_MESH
52 #include <net80211/ieee80211_mesh.h>
53 #endif
54
55 #include <net/bpf.h>
56
57 #ifdef INET
58 #include <netinet/in.h>
59 #include <net/ethernet.h>
60 #endif
61
62 static void
ieee80211_process_mimo(struct ieee80211_node * ni,struct ieee80211_rx_stats * rx)63 ieee80211_process_mimo(struct ieee80211_node *ni, struct ieee80211_rx_stats *rx)
64 {
65 int i;
66
67 /* Verify the required MIMO bits are set */
68 if ((rx->r_flags & (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI)) !=
69 (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI))
70 return;
71
72 /* XXX This assumes the MIMO radios have both ctl and ext chains */
73 for (i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) {
74 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ctl[i], rx->c_rssi_ctl[i]);
75 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ext[i], rx->c_rssi_ext[i]);
76 }
77
78 /* XXX This also assumes the MIMO radios have both ctl and ext chains */
79 for(i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) {
80 ni->ni_mimo_noise_ctl[i] = rx->c_nf_ctl[i];
81 ni->ni_mimo_noise_ext[i] = rx->c_nf_ext[i];
82 }
83 ni->ni_mimo_chains = rx->c_chain;
84 }
85
86 int
ieee80211_input_mimo(struct ieee80211_node * ni,struct mbuf * m)87 ieee80211_input_mimo(struct ieee80211_node *ni, struct mbuf *m)
88 {
89 struct ieee80211_rx_stats rxs;
90
91 /* try to read stats from mbuf */
92 bzero(&rxs, sizeof(rxs));
93 if (ieee80211_get_rx_params(m, &rxs) != 0)
94 return (-1);
95
96 /* XXX should assert IEEE80211_R_NF and IEEE80211_R_RSSI are set */
97 ieee80211_process_mimo(ni, &rxs);
98
99 //return ieee80211_input(ni, m, rx->rssi, rx->nf);
100 return ni->ni_vap->iv_input(ni, m, &rxs, rxs.c_rssi, rxs.c_nf);
101 }
102
103 int
ieee80211_input_all(struct ieee80211com * ic,struct mbuf * m,int rssi,int nf)104 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf)
105 {
106 struct ieee80211_rx_stats rx;
107
108 rx.r_flags = IEEE80211_R_NF | IEEE80211_R_RSSI;
109 rx.c_nf = nf;
110 rx.c_rssi = rssi;
111
112 if (!ieee80211_add_rx_params(m, &rx))
113 return (-1);
114
115 return ieee80211_input_mimo_all(ic, m);
116 }
117
118 int
ieee80211_input_mimo_all(struct ieee80211com * ic,struct mbuf * m)119 ieee80211_input_mimo_all(struct ieee80211com *ic, struct mbuf *m)
120 {
121 struct ieee80211vap *vap;
122 int type = -1;
123
124 m->m_flags |= M_BCAST; /* NB: mark for bpf tap'ing */
125
126 /* XXX locking */
127 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
128 struct ieee80211_node *ni;
129 struct mbuf *mcopy;
130
131 /* NB: could check for IFF_UP but this is cheaper */
132 if (vap->iv_state == IEEE80211_S_INIT)
133 continue;
134 /*
135 * WDS vap's only receive directed traffic from the
136 * station at the ``far end''. That traffic should
137 * be passed through the AP vap the station is associated
138 * to--so don't spam them with mcast frames.
139 */
140 if (vap->iv_opmode == IEEE80211_M_WDS)
141 continue;
142 if (TAILQ_NEXT(vap, iv_next) != NULL) {
143 /*
144 * Packet contents are changed by ieee80211_decap
145 * so do a deep copy of the packet.
146 * NB: tags are copied too.
147 */
148 mcopy = m_dup(m, IEEE80211_M_NOWAIT);
149 if (mcopy == NULL) {
150 /* XXX stat+msg */
151 continue;
152 }
153 } else {
154 mcopy = m;
155 m = NULL;
156 }
157 ni = ieee80211_ref_node(vap->iv_bss);
158 type = ieee80211_input_mimo(ni, mcopy);
159 ieee80211_free_node(ni);
160 }
161 if (m != NULL) /* no vaps, reclaim mbuf */
162 m_freem(m);
163 return type;
164 }
165
166 /*
167 * This function reassembles fragments.
168 *
169 * XXX should handle 3 concurrent reassemblies per-spec.
170 */
171 struct mbuf *
ieee80211_defrag(struct ieee80211_node * ni,struct mbuf * m,int hdrspace,int has_decrypted)172 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace,
173 int has_decrypted)
174 {
175 struct ieee80211vap *vap = ni->ni_vap;
176 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
177 struct ieee80211_frame *lwh;
178 uint16_t rxseq;
179 uint8_t fragno;
180 uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG;
181 struct mbuf *mfrag;
182
183 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?"));
184
185 rxseq = le16toh(*(uint16_t *)wh->i_seq);
186 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK;
187
188 /* Quick way out, if there's nothing to defragment */
189 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL)
190 return m;
191
192 /* Temporarily set flag to remember if fragment was encrypted. */
193 /* XXX use a non-packet altering storage for this in the future. */
194 if (has_decrypted)
195 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED;
196
197 /*
198 * Remove frag to insure it doesn't get reaped by timer.
199 */
200 if (ni->ni_table == NULL) {
201 /*
202 * Should never happen. If the node is orphaned (not in
203 * the table) then input packets should not reach here.
204 * Otherwise, a concurrent request that yanks the table
205 * should be blocked by other interlocking and/or by first
206 * shutting the driver down. Regardless, be defensive
207 * here and just bail
208 */
209 /* XXX need msg+stat */
210 m_freem(m);
211 return NULL;
212 }
213 IEEE80211_NODE_LOCK(ni->ni_table);
214 mfrag = ni->ni_rxfrag[0];
215 ni->ni_rxfrag[0] = NULL;
216 IEEE80211_NODE_UNLOCK(ni->ni_table);
217
218 /*
219 * Validate new fragment is in order and
220 * related to the previous ones.
221 */
222 if (mfrag != NULL) {
223 uint16_t last_rxseq;
224
225 lwh = mtod(mfrag, struct ieee80211_frame *);
226 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq);
227 /*
228 * NB: check seq # and frag together. Also check that both
229 * fragments are plaintext or that both are encrypted.
230 */
231 if (rxseq == last_rxseq+1 &&
232 IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) &&
233 IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2) &&
234 !((wh->i_fc[1] ^ lwh->i_fc[1]) & IEEE80211_FC1_PROTECTED)) {
235 /* XXX clear MORE_FRAG bit? */
236 /* track last seqnum and fragno */
237 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq;
238
239 m_adj(m, hdrspace); /* strip header */
240 m_catpkt(mfrag, m); /* concatenate */
241 } else {
242 /*
243 * Unrelated fragment or no space for it,
244 * clear current fragments.
245 */
246 m_freem(mfrag);
247 mfrag = NULL;
248 }
249 }
250
251 if (mfrag == NULL) {
252 if (fragno != 0) { /* !first fragment, discard */
253 vap->iv_stats.is_rx_defrag++;
254 IEEE80211_NODE_STAT(ni, rx_defrag);
255 m_freem(m);
256 return NULL;
257 }
258 mfrag = m;
259 }
260 if (more_frag) { /* more to come, save */
261 ni->ni_rxfragstamp = ticks;
262 ni->ni_rxfrag[0] = mfrag;
263 mfrag = NULL;
264 }
265 /* Remember to clear protected flag that was temporarily set. */
266 if (mfrag != NULL) {
267 wh = mtod(mfrag, struct ieee80211_frame *);
268 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
269 }
270 return mfrag;
271 }
272
273 void
ieee80211_deliver_data(struct ieee80211vap * vap,struct ieee80211_node * ni,struct mbuf * m)274 ieee80211_deliver_data(struct ieee80211vap *vap,
275 struct ieee80211_node *ni, struct mbuf *m)
276 {
277 struct epoch_tracker et;
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 NET_EPOCH_ENTER(et);
309 ifp->if_input(ifp, m);
310 NET_EPOCH_EXIT(et);
311 }
312
313 struct mbuf *
ieee80211_decap(struct ieee80211vap * vap,struct mbuf * m,int hdrlen,uint8_t qos)314 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen,
315 uint8_t qos)
316 {
317 struct ieee80211_qosframe_addr4 wh;
318 struct ether_header *eh;
319 struct llc *llc;
320
321 KASSERT(hdrlen <= sizeof(wh),
322 ("hdrlen %d > max %zd", hdrlen, sizeof(wh)));
323
324 if (m->m_len < hdrlen + sizeof(*llc) &&
325 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) {
326 vap->iv_stats.is_rx_tooshort++;
327 /* XXX msg */
328 return NULL;
329 }
330 memcpy(&wh, mtod(m, caddr_t), hdrlen);
331 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen);
332 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP &&
333 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 &&
334 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 &&
335 /* NB: preserve AppleTalk frames that have a native SNAP hdr */
336 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) ||
337 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX)) &&
338 /* Do not want to touch A-MSDU frames. */
339 !(qos & IEEE80211_QOS_AMSDU)) {
340 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh));
341 llc = NULL;
342 } else {
343 m_adj(m, hdrlen - sizeof(*eh));
344 }
345 eh = mtod(m, struct ether_header *);
346 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) {
347 case IEEE80211_FC1_DIR_NODS:
348 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
349 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
350 break;
351 case IEEE80211_FC1_DIR_TODS:
352 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
353 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
354 break;
355 case IEEE80211_FC1_DIR_FROMDS:
356 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
357 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3);
358 break;
359 case IEEE80211_FC1_DIR_DSTODS:
360 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
361 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4);
362 break;
363 }
364 #ifndef __NO_STRICT_ALIGNMENT
365 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) {
366 m = ieee80211_realign(vap, m, sizeof(*eh));
367 if (m == NULL)
368 return NULL;
369 }
370 #endif /* !__NO_STRICT_ALIGNMENT */
371 if (llc != NULL) {
372 eh = mtod(m, struct ether_header *);
373 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh));
374 }
375 return m;
376 }
377
378 /*
379 * Decap a frame encapsulated in a fast-frame/A-MSDU.
380 */
381 struct mbuf *
ieee80211_decap1(struct mbuf * m,int * framelen)382 ieee80211_decap1(struct mbuf *m, int *framelen)
383 {
384 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc))
385 struct ether_header *eh;
386 struct llc *llc;
387 const uint8_t llc_hdr_mac[ETHER_ADDR_LEN] = {
388 /* MAC address matching the 802.2 LLC header */
389 LLC_SNAP_LSAP, LLC_SNAP_LSAP, LLC_UI, 0, 0, 0
390 };
391
392 /*
393 * The frame has an 802.3 header followed by an 802.2
394 * LLC header. The encapsulated frame length is in the
395 * first header type field; save that and overwrite it
396 * with the true type field found in the second. Then
397 * copy the 802.3 header up to where it belongs and
398 * adjust the mbuf contents to remove the void.
399 */
400 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL)
401 return NULL;
402 eh = mtod(m, struct ether_header *); /* 802.3 header is first */
403
404 /*
405 * Detect possible attack where a single 802.11 frame is processed
406 * as an A-MSDU frame due to an adversary setting the A-MSDU present
407 * bit in the 802.11 QoS header. [FragAttacks]
408 */
409 if (memcmp(eh->ether_dhost, llc_hdr_mac, ETHER_ADDR_LEN) == 0)
410 return NULL;
411
412 llc = (struct llc *)&eh[1]; /* 802.2 header follows */
413 *framelen = ntohs(eh->ether_type) /* encap'd frame size */
414 + sizeof(struct ether_header) - sizeof(struct llc);
415 eh->ether_type = llc->llc_un.type_snap.ether_type;
416 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc),
417 sizeof(struct ether_header));
418 m_adj(m, sizeof(struct llc));
419 return m;
420 #undef FF_LLC_SIZE
421 }
422
423 /*
424 * Install received rate set information in the node's state block.
425 */
426 int
ieee80211_setup_rates(struct ieee80211_node * ni,const uint8_t * rates,const uint8_t * xrates,int flags)427 ieee80211_setup_rates(struct ieee80211_node *ni,
428 const uint8_t *rates, const uint8_t *xrates, int flags)
429 {
430 struct ieee80211vap *vap = ni->ni_vap;
431 struct ieee80211_rateset *rs = &ni->ni_rates;
432
433 memset(rs, 0, sizeof(*rs));
434 rs->rs_nrates = rates[1];
435 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates);
436 if (xrates != NULL) {
437 uint8_t nxrates;
438 /*
439 * Tack on 11g extended supported rate element.
440 */
441 nxrates = xrates[1];
442 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) {
443 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates;
444 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni,
445 "extended rate set too large; only using "
446 "%u of %u rates", nxrates, xrates[1]);
447 vap->iv_stats.is_rx_rstoobig++;
448 }
449 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates);
450 rs->rs_nrates += nxrates;
451 }
452 return ieee80211_fix_rate(ni, rs, flags);
453 }
454
455 /*
456 * Send a management frame error response to the specified
457 * station. If ni is associated with the station then use
458 * it; otherwise allocate a temporary node suitable for
459 * transmitting the frame and then free the reference so
460 * it will go away as soon as the frame has been transmitted.
461 */
462 void
ieee80211_send_error(struct ieee80211_node * ni,const uint8_t mac[IEEE80211_ADDR_LEN],int subtype,int arg)463 ieee80211_send_error(struct ieee80211_node *ni,
464 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg)
465 {
466 struct ieee80211vap *vap = ni->ni_vap;
467 int istmp;
468
469 if (ni == vap->iv_bss) {
470 if (vap->iv_state != IEEE80211_S_RUN) {
471 /*
472 * XXX hack until we get rid of this routine.
473 * We can be called prior to the vap reaching
474 * run state under certain conditions in which
475 * case iv_bss->ni_chan will not be setup.
476 * Check for this explicitly and and just ignore
477 * the request.
478 */
479 return;
480 }
481 ni = ieee80211_tmp_node(vap, mac);
482 if (ni == NULL) {
483 /* XXX msg */
484 return;
485 }
486 istmp = 1;
487 } else
488 istmp = 0;
489 IEEE80211_SEND_MGMT(ni, subtype, arg);
490 if (istmp)
491 ieee80211_free_node(ni);
492 }
493
494 int
ieee80211_alloc_challenge(struct ieee80211_node * ni)495 ieee80211_alloc_challenge(struct ieee80211_node *ni)
496 {
497 if (ni->ni_challenge == NULL)
498 ni->ni_challenge = (uint32_t *)
499 IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN,
500 M_80211_NODE, IEEE80211_M_NOWAIT);
501 if (ni->ni_challenge == NULL) {
502 IEEE80211_NOTE(ni->ni_vap,
503 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni,
504 "%s", "shared key challenge alloc failed");
505 /* XXX statistic */
506 }
507 return (ni->ni_challenge != NULL);
508 }
509
510 /*
511 * Parse a Beacon or ProbeResponse frame and return the
512 * useful information in an ieee80211_scanparams structure.
513 * Status is set to 0 if no problems were found; otherwise
514 * a bitmask of IEEE80211_BPARSE_* items is returned that
515 * describes the problems detected.
516 */
517 int
ieee80211_parse_beacon(struct ieee80211_node * ni,struct mbuf * m,struct ieee80211_channel * rxchan,struct ieee80211_scanparams * scan)518 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m,
519 struct ieee80211_channel *rxchan, struct ieee80211_scanparams *scan)
520 {
521 struct ieee80211vap *vap = ni->ni_vap;
522 struct ieee80211com *ic = ni->ni_ic;
523 struct ieee80211_frame *wh;
524 uint8_t *frm, *efrm;
525
526 wh = mtod(m, struct ieee80211_frame *);
527 frm = (uint8_t *)&wh[1];
528 efrm = mtod(m, uint8_t *) + m->m_len;
529 scan->status = 0;
530 /*
531 * beacon/probe response frame format
532 *
533 * XXX Update from 802.11-2012 - eg where HT is
534 * [8] time stamp
535 * [2] beacon interval
536 * [2] capability information
537 * [tlv] ssid
538 * [tlv] supported rates
539 * [tlv] country information
540 * [tlv] channel switch announcement (CSA)
541 * [tlv] parameter set (FH/DS)
542 * [tlv] erp information
543 * [tlv] extended supported rates
544 * [tlv] WME
545 * [tlv] WPA or RSN
546 * [tlv] HT capabilities
547 * [tlv] HT information
548 * [tlv] VHT capabilities
549 * [tlv] VHT information
550 * [tlv] Atheros capabilities
551 * [tlv] Mesh ID
552 * [tlv] Mesh Configuration
553 */
554 IEEE80211_VERIFY_LENGTH(efrm - frm, 12,
555 return (scan->status = IEEE80211_BPARSE_BADIELEN));
556 memset(scan, 0, sizeof(*scan));
557 scan->tstamp = frm; frm += 8;
558 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2;
559 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2;
560 scan->bchan = ieee80211_chan2ieee(ic, rxchan);
561 scan->chan = scan->bchan;
562 scan->ies = frm;
563 scan->ies_len = efrm - frm;
564
565 while (efrm - frm > 1) {
566 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2,
567 return (scan->status = IEEE80211_BPARSE_BADIELEN));
568 switch (*frm) {
569 case IEEE80211_ELEMID_SSID:
570 scan->ssid = frm;
571 break;
572 case IEEE80211_ELEMID_RATES:
573 scan->rates = frm;
574 break;
575 case IEEE80211_ELEMID_COUNTRY:
576 scan->country = frm;
577 break;
578 case IEEE80211_ELEMID_CSA:
579 scan->csa = frm;
580 break;
581 case IEEE80211_ELEMID_QUIET:
582 scan->quiet = frm;
583 break;
584 case IEEE80211_ELEMID_FHPARMS:
585 if (ic->ic_phytype == IEEE80211_T_FH) {
586 scan->fhdwell = le16dec(&frm[2]);
587 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]);
588 scan->fhindex = frm[6];
589 }
590 break;
591 case IEEE80211_ELEMID_DSPARMS:
592 /*
593 * XXX hack this since depending on phytype
594 * is problematic for multi-mode devices.
595 */
596 if (ic->ic_phytype != IEEE80211_T_FH)
597 scan->chan = frm[2];
598 break;
599 case IEEE80211_ELEMID_TIM:
600 /* XXX ATIM? */
601 scan->tim = frm;
602 scan->timoff = frm - mtod(m, uint8_t *);
603 break;
604 case IEEE80211_ELEMID_IBSSPARMS:
605 case IEEE80211_ELEMID_CFPARMS:
606 case IEEE80211_ELEMID_PWRCNSTR:
607 case IEEE80211_ELEMID_BSSLOAD:
608 case IEEE80211_ELEMID_APCHANREP:
609 /* NB: avoid debugging complaints */
610 break;
611 case IEEE80211_ELEMID_XRATES:
612 scan->xrates = frm;
613 break;
614 case IEEE80211_ELEMID_ERP:
615 if (frm[1] != 1) {
616 IEEE80211_DISCARD_IE(vap,
617 IEEE80211_MSG_ELEMID, wh, "ERP",
618 "bad len %u", frm[1]);
619 vap->iv_stats.is_rx_elem_toobig++;
620 break;
621 }
622 scan->erp = frm[2] | 0x100;
623 break;
624 case IEEE80211_ELEMID_HTCAP:
625 scan->htcap = frm;
626 break;
627 case IEEE80211_ELEMID_VHT_CAP:
628 scan->vhtcap = frm;
629 break;
630 case IEEE80211_ELEMID_VHT_OPMODE:
631 scan->vhtopmode = frm;
632 break;
633 case IEEE80211_ELEMID_RSN:
634 scan->rsn = frm;
635 break;
636 case IEEE80211_ELEMID_HTINFO:
637 scan->htinfo = frm;
638 break;
639 #ifdef IEEE80211_SUPPORT_MESH
640 case IEEE80211_ELEMID_MESHID:
641 scan->meshid = frm;
642 break;
643 case IEEE80211_ELEMID_MESHCONF:
644 scan->meshconf = frm;
645 break;
646 #endif
647 /* Extended capabilities; nothing handles it for now */
648 case IEEE80211_ELEMID_EXTCAP:
649 break;
650 case IEEE80211_ELEMID_VENDOR:
651 if (iswpaoui(frm))
652 scan->wpa = frm;
653 else if (iswmeparam(frm) || iswmeinfo(frm))
654 scan->wme = frm;
655 #ifdef IEEE80211_SUPPORT_SUPERG
656 else if (isatherosoui(frm))
657 scan->ath = frm;
658 #endif
659 #ifdef IEEE80211_SUPPORT_TDMA
660 else if (istdmaoui(frm))
661 scan->tdma = frm;
662 #endif
663 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
664 /*
665 * Accept pre-draft HT ie's if the
666 * standard ones have not been seen.
667 */
668 if (ishtcapoui(frm)) {
669 if (scan->htcap == NULL)
670 scan->htcap = frm;
671 } else if (ishtinfooui(frm)) {
672 if (scan->htinfo == NULL)
673 scan->htcap = frm;
674 }
675 }
676 break;
677 default:
678 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID,
679 wh, "unhandled",
680 "id %u, len %u", *frm, frm[1]);
681 vap->iv_stats.is_rx_elem_unknown++;
682 break;
683 }
684 frm += frm[1] + 2;
685 }
686 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE,
687 scan->status |= IEEE80211_BPARSE_RATES_INVALID);
688 if (scan->rates != NULL && scan->xrates != NULL) {
689 /*
690 * NB: don't process XRATES if RATES is missing. This
691 * avoids a potential null ptr deref and should be ok
692 * as the return code will already note RATES is missing
693 * (so callers shouldn't otherwise process the frame).
694 */
695 IEEE80211_VERIFY_ELEMENT(scan->xrates,
696 IEEE80211_RATE_MAXSIZE - scan->rates[1],
697 scan->status |= IEEE80211_BPARSE_XRATES_INVALID);
698 }
699 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN,
700 scan->status |= IEEE80211_BPARSE_SSID_INVALID);
701 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) {
702 /*
703 * Frame was received on a channel different from the
704 * one indicated in the DS params element id;
705 * silently discard it.
706 *
707 * NB: this can happen due to signal leakage.
708 * But we should take it for FH phy because
709 * the rssi value should be correct even for
710 * different hop pattern in FH.
711 */
712 IEEE80211_DISCARD(vap,
713 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
714 wh, NULL, "for off-channel %u (bchan=%u)",
715 scan->chan, scan->bchan);
716 vap->iv_stats.is_rx_chanmismatch++;
717 scan->status |= IEEE80211_BPARSE_OFFCHAN;
718 }
719 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval &&
720 scan->bintval <= IEEE80211_BINTVAL_MAX)) {
721 IEEE80211_DISCARD(vap,
722 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
723 wh, NULL, "bogus beacon interval (%d TU)",
724 (int) scan->bintval);
725 vap->iv_stats.is_rx_badbintval++;
726 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID;
727 }
728 if (scan->country != NULL) {
729 /*
730 * Validate we have at least enough data to extract
731 * the country code. Not sure if we should return an
732 * error instead of discarding the IE; consider this
733 * being lenient as we don't depend on the data for
734 * correct operation.
735 */
736 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t),
737 scan->country = NULL);
738 }
739 if (scan->csa != NULL) {
740 /*
741 * Validate Channel Switch Announcement; this must
742 * be the correct length or we toss the frame.
743 */
744 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t),
745 scan->status |= IEEE80211_BPARSE_CSA_INVALID);
746 }
747 #ifdef IEEE80211_SUPPORT_MESH
748 if (scan->meshid != NULL) {
749 IEEE80211_VERIFY_ELEMENT(scan->meshid, IEEE80211_MESHID_LEN,
750 scan->status |= IEEE80211_BPARSE_MESHID_INVALID);
751 }
752 #endif
753 /*
754 * Process HT ie's. This is complicated by our
755 * accepting both the standard ie's and the pre-draft
756 * vendor OUI ie's that some vendors still use/require.
757 */
758 if (scan->htcap != NULL) {
759 IEEE80211_VERIFY_LENGTH(scan->htcap[1],
760 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ?
761 4 + sizeof(struct ieee80211_ie_htcap)-2 :
762 sizeof(struct ieee80211_ie_htcap)-2,
763 scan->htcap = NULL);
764 }
765 if (scan->htinfo != NULL) {
766 IEEE80211_VERIFY_LENGTH(scan->htinfo[1],
767 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ?
768 4 + sizeof(struct ieee80211_ie_htinfo)-2 :
769 sizeof(struct ieee80211_ie_htinfo)-2,
770 scan->htinfo = NULL);
771 }
772
773 /* Process VHT IEs */
774 if (scan->vhtcap != NULL) {
775 IEEE80211_VERIFY_LENGTH(scan->vhtcap[1],
776 sizeof(struct ieee80211_vht_cap),
777 scan->vhtcap = NULL);
778 }
779 if (scan->vhtopmode != NULL) {
780 IEEE80211_VERIFY_LENGTH(scan->vhtopmode[1],
781 sizeof(struct ieee80211_vht_operation),
782 scan->vhtopmode = NULL);
783 }
784
785 return scan->status;
786 }
787
788 /*
789 * Parse an Action frame. Return 0 on success, non-zero on failure.
790 */
791 int
ieee80211_parse_action(struct ieee80211_node * ni,struct mbuf * m)792 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m)
793 {
794 struct ieee80211vap *vap = ni->ni_vap;
795 const struct ieee80211_action *ia;
796 struct ieee80211_frame *wh;
797 uint8_t *frm, *efrm;
798
799 /*
800 * action frame format:
801 * [1] category
802 * [1] action
803 * [tlv] parameters
804 */
805 wh = mtod(m, struct ieee80211_frame *);
806 frm = (u_int8_t *)&wh[1];
807 efrm = mtod(m, u_int8_t *) + m->m_len;
808 IEEE80211_VERIFY_LENGTH(efrm - frm,
809 sizeof(struct ieee80211_action), return EINVAL);
810 ia = (const struct ieee80211_action *) frm;
811
812 vap->iv_stats.is_rx_action++;
813 IEEE80211_NODE_STAT(ni, rx_action);
814
815 /* verify frame payloads but defer processing */
816 switch (ia->ia_category) {
817 case IEEE80211_ACTION_CAT_BA:
818 switch (ia->ia_action) {
819 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
820 IEEE80211_VERIFY_LENGTH(efrm - frm,
821 sizeof(struct ieee80211_action_ba_addbarequest),
822 return EINVAL);
823 break;
824 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
825 IEEE80211_VERIFY_LENGTH(efrm - frm,
826 sizeof(struct ieee80211_action_ba_addbaresponse),
827 return EINVAL);
828 break;
829 case IEEE80211_ACTION_BA_DELBA:
830 IEEE80211_VERIFY_LENGTH(efrm - frm,
831 sizeof(struct ieee80211_action_ba_delba),
832 return EINVAL);
833 break;
834 }
835 break;
836 case IEEE80211_ACTION_CAT_HT:
837 switch (ia->ia_action) {
838 case IEEE80211_ACTION_HT_TXCHWIDTH:
839 IEEE80211_VERIFY_LENGTH(efrm - frm,
840 sizeof(struct ieee80211_action_ht_txchwidth),
841 return EINVAL);
842 break;
843 case IEEE80211_ACTION_HT_MIMOPWRSAVE:
844 IEEE80211_VERIFY_LENGTH(efrm - frm,
845 sizeof(struct ieee80211_action_ht_mimopowersave),
846 return EINVAL);
847 break;
848 }
849 break;
850 #ifdef IEEE80211_SUPPORT_MESH
851 case IEEE80211_ACTION_CAT_MESH:
852 switch (ia->ia_action) {
853 case IEEE80211_ACTION_MESH_LMETRIC:
854 /*
855 * XXX: verification is true only if we are using
856 * Airtime link metric (default)
857 */
858 IEEE80211_VERIFY_LENGTH(efrm - frm,
859 sizeof(struct ieee80211_meshlmetric_ie),
860 return EINVAL);
861 break;
862 case IEEE80211_ACTION_MESH_HWMP:
863 /* verify something */
864 break;
865 case IEEE80211_ACTION_MESH_GANN:
866 IEEE80211_VERIFY_LENGTH(efrm - frm,
867 sizeof(struct ieee80211_meshgann_ie),
868 return EINVAL);
869 break;
870 case IEEE80211_ACTION_MESH_CC:
871 case IEEE80211_ACTION_MESH_MCCA_SREQ:
872 case IEEE80211_ACTION_MESH_MCCA_SREP:
873 case IEEE80211_ACTION_MESH_MCCA_AREQ:
874 case IEEE80211_ACTION_MESH_MCCA_ADVER:
875 case IEEE80211_ACTION_MESH_MCCA_TRDOWN:
876 case IEEE80211_ACTION_MESH_TBTT_REQ:
877 case IEEE80211_ACTION_MESH_TBTT_RES:
878 /* reject these early on, not implemented */
879 IEEE80211_DISCARD(vap,
880 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
881 wh, NULL, "not implemented yet, act=0x%02X",
882 ia->ia_action);
883 return EINVAL;
884 }
885 break;
886 case IEEE80211_ACTION_CAT_SELF_PROT:
887 /* If TA or RA group address discard silently */
888 if (IEEE80211_IS_MULTICAST(wh->i_addr1) ||
889 IEEE80211_IS_MULTICAST(wh->i_addr2))
890 return EINVAL;
891 /*
892 * XXX: Should we verify complete length now or it is
893 * to varying in sizes?
894 */
895 switch (ia->ia_action) {
896 case IEEE80211_ACTION_MESHPEERING_CONFIRM:
897 case IEEE80211_ACTION_MESHPEERING_CLOSE:
898 /* is not a peering candidate (yet) */
899 if (ni == vap->iv_bss)
900 return EINVAL;
901 break;
902 }
903 break;
904 #endif
905 case IEEE80211_ACTION_CAT_VHT:
906 printf("%s: TODO: VHT handling!\n", __func__);
907 break;
908 }
909 return 0;
910 }
911
912 #ifdef IEEE80211_DEBUG
913 /*
914 * Debugging support.
915 */
916 void
ieee80211_ssid_mismatch(struct ieee80211vap * vap,const char * tag,uint8_t mac[IEEE80211_ADDR_LEN],uint8_t * ssid)917 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag,
918 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid)
919 {
920 printf("[%s] discard %s frame, ssid mismatch: ",
921 ether_sprintf(mac), tag);
922 ieee80211_print_essid(ssid + 2, ssid[1]);
923 printf("\n");
924 }
925
926 /*
927 * Return the bssid of a frame.
928 */
929 static const uint8_t *
ieee80211_getbssid(const struct ieee80211vap * vap,const struct ieee80211_frame * wh)930 ieee80211_getbssid(const struct ieee80211vap *vap,
931 const struct ieee80211_frame *wh)
932 {
933 if (vap->iv_opmode == IEEE80211_M_STA)
934 return wh->i_addr2;
935 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS)
936 return wh->i_addr1;
937 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL)
938 return wh->i_addr1;
939 return wh->i_addr3;
940 }
941
942 #include <machine/stdarg.h>
943
944 void
ieee80211_note(const struct ieee80211vap * vap,const char * fmt,...)945 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...)
946 {
947 char buf[256]; /* XXX */
948 va_list ap;
949 int len;
950
951 va_start(ap, fmt);
952 len = vsnprintf(buf, sizeof(buf), fmt, ap);
953 va_end(ap);
954
955 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */
956
957 if (len >= sizeof(buf))
958 printf("%s: XXX buffer too small: len = %d\n", __func__, len);
959 }
960
961 void
ieee80211_note_frame(const struct ieee80211vap * vap,const struct ieee80211_frame * wh,const char * fmt,...)962 ieee80211_note_frame(const struct ieee80211vap *vap,
963 const struct ieee80211_frame *wh,
964 const char *fmt, ...)
965 {
966 char buf[256]; /* XXX */
967 va_list ap;
968 int len;
969
970 va_start(ap, fmt);
971 len = vsnprintf(buf, sizeof(buf), fmt, ap);
972 va_end(ap);
973 if_printf(vap->iv_ifp, "[%s] %s\n",
974 ether_sprintf(ieee80211_getbssid(vap, wh)), buf);
975
976 if (len >= sizeof(buf))
977 printf("%s: XXX buffer too small: len = %d\n", __func__, len);
978 }
979
980 void
ieee80211_note_mac(const struct ieee80211vap * vap,const uint8_t mac[IEEE80211_ADDR_LEN],const char * fmt,...)981 ieee80211_note_mac(const struct ieee80211vap *vap,
982 const uint8_t mac[IEEE80211_ADDR_LEN],
983 const char *fmt, ...)
984 {
985 char buf[256]; /* XXX */
986 va_list ap;
987 int len;
988
989 va_start(ap, fmt);
990 len = vsnprintf(buf, sizeof(buf), fmt, ap);
991 va_end(ap);
992 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf);
993
994 if (len >= sizeof(buf))
995 printf("%s: XXX buffer too small: len = %d\n", __func__, len);
996 }
997
998 void
ieee80211_discard_frame(const struct ieee80211vap * vap,const struct ieee80211_frame * wh,const char * type,const char * fmt,...)999 ieee80211_discard_frame(const struct ieee80211vap *vap,
1000 const struct ieee80211_frame *wh,
1001 const char *type, const char *fmt, ...)
1002 {
1003 char buf[256]; /* XXX */
1004 va_list ap;
1005 int len;
1006
1007 va_start(ap, fmt);
1008 len = vsnprintf(buf, sizeof(buf), fmt, ap);
1009 va_end(ap);
1010
1011 if_printf(vap->iv_ifp, "[%s] discard %s frame, %s\n",
1012 ether_sprintf(ieee80211_getbssid(vap, wh)),
1013 type != NULL ? type : ieee80211_mgt_subtype_name(wh->i_fc[0]),
1014 buf);
1015
1016 if (len >= sizeof(buf))
1017 printf("%s: XXX buffer too small: len = %d\n", __func__, len);
1018 }
1019
1020 void
ieee80211_discard_ie(const struct ieee80211vap * vap,const struct ieee80211_frame * wh,const char * type,const char * fmt,...)1021 ieee80211_discard_ie(const struct ieee80211vap *vap,
1022 const struct ieee80211_frame *wh,
1023 const char *type, const char *fmt, ...)
1024 {
1025 char buf[256]; /* XXX */
1026 va_list ap;
1027 int len;
1028
1029 va_start(ap, fmt);
1030 len = vsnprintf(buf, sizeof(buf), fmt, ap);
1031 va_end(ap);
1032
1033 if_printf(vap->iv_ifp, "[%s] discard%s%s information element, %s\n",
1034 ether_sprintf(ieee80211_getbssid(vap, wh)),
1035 type != NULL ? " " : "", type != NULL ? type : "", buf);
1036
1037 if (len >= sizeof(buf))
1038 printf("%s: XXX buffer too small: len = %d\n", __func__, len);
1039 }
1040
1041 void
ieee80211_discard_mac(const struct ieee80211vap * vap,const uint8_t mac[IEEE80211_ADDR_LEN],const char * type,const char * fmt,...)1042 ieee80211_discard_mac(const struct ieee80211vap *vap,
1043 const uint8_t mac[IEEE80211_ADDR_LEN],
1044 const char *type, const char *fmt, ...)
1045 {
1046 char buf[256]; /* XXX */
1047 va_list ap;
1048 int len;
1049
1050 va_start(ap, fmt);
1051 len = vsnprintf(buf, sizeof(buf), fmt, ap);
1052 va_end(ap);
1053
1054 if_printf(vap->iv_ifp, "[%s] discard%s%s frame, %s\n",
1055 ether_sprintf(mac),
1056 type != NULL ? " " : "", type != NULL ? type : "", buf);
1057
1058 if (len >= sizeof(buf))
1059 printf("%s: XXX buffer too small: len = %d\n", __func__, len);
1060 }
1061 #endif /* IEEE80211_DEBUG */
1062