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 #include <sys/epoch.h>
39
40 #include <sys/socket.h>
41
42 #include <net/ethernet.h>
43 #include <net/if.h>
44 #include <net/if_var.h>
45 #include <net/if_llc.h>
46 #include <net/if_media.h>
47 #include <net/if_private.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
ieee80211_process_mimo(struct ieee80211_node * ni,struct ieee80211_rx_stats * rx)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
ieee80211_input_mimo(struct ieee80211_node * ni,struct mbuf * m)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
ieee80211_input_all(struct ieee80211com * ic,struct mbuf * m,int rssi,int nf)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
ieee80211_input_mimo_all(struct ieee80211com * ic,struct mbuf * m)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 *
ieee80211_defrag(struct ieee80211_node * ni,struct mbuf * m,int hdrspace,int has_decrypted)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
ieee80211_deliver_data(struct ieee80211vap * vap,struct ieee80211_node * ni,struct mbuf * m)275 ieee80211_deliver_data(struct ieee80211vap *vap,
276 struct ieee80211_node *ni, struct mbuf *m)
277 {
278 struct epoch_tracker et;
279 struct ether_header *eh = mtod(m, struct ether_header *);
280 struct ifnet *ifp = vap->iv_ifp;
281
282 /* clear driver/net80211 flags before passing up */
283 m->m_flags &= ~(M_MCAST | M_BCAST);
284 m_clrprotoflags(m);
285
286 /* NB: see hostap_deliver_data, this path doesn't handle hostap */
287 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap"));
288 /*
289 * Do accounting.
290 */
291 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
292 IEEE80211_NODE_STAT(ni, rx_data);
293 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
294 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
295 if (ETHER_IS_BROADCAST(eh->ether_dhost))
296 m->m_flags |= M_BCAST;
297 else
298 m->m_flags |= M_MCAST;
299 IEEE80211_NODE_STAT(ni, rx_mcast);
300 } else
301 IEEE80211_NODE_STAT(ni, rx_ucast);
302 m->m_pkthdr.rcvif = ifp;
303
304 if (ni->ni_vlan != 0) {
305 /* attach vlan tag */
306 m->m_pkthdr.ether_vtag = ni->ni_vlan;
307 m->m_flags |= M_VLANTAG;
308 }
309 NET_EPOCH_ENTER(et);
310 ifp->if_input(ifp, m);
311 NET_EPOCH_EXIT(et);
312 }
313
314 struct mbuf *
ieee80211_decap(struct ieee80211vap * vap,struct mbuf * m,int hdrlen,uint8_t qos)315 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen,
316 uint8_t qos)
317 {
318 struct ieee80211_qosframe_addr4 wh;
319 struct ether_header *eh;
320 struct llc *llc;
321
322 KASSERT(hdrlen <= sizeof(wh),
323 ("hdrlen %d > max %zd", hdrlen, sizeof(wh)));
324
325 if (m->m_len < hdrlen + sizeof(*llc) &&
326 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) {
327 vap->iv_stats.is_rx_tooshort++;
328 /* XXX msg */
329 return NULL;
330 }
331 memcpy(&wh, mtod(m, caddr_t), hdrlen);
332 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen);
333 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP &&
334 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 &&
335 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 &&
336 /* NB: preserve AppleTalk frames that have a native SNAP hdr */
337 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) ||
338 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX)) &&
339 /* Do not want to touch A-MSDU frames. */
340 !(qos & IEEE80211_QOS_AMSDU)) {
341 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh));
342 llc = NULL;
343 } else {
344 m_adj(m, hdrlen - sizeof(*eh));
345 }
346 eh = mtod(m, struct ether_header *);
347 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) {
348 case IEEE80211_FC1_DIR_NODS:
349 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
350 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
351 break;
352 case IEEE80211_FC1_DIR_TODS:
353 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
354 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
355 break;
356 case IEEE80211_FC1_DIR_FROMDS:
357 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
358 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3);
359 break;
360 case IEEE80211_FC1_DIR_DSTODS:
361 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
362 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4);
363 break;
364 }
365 #ifndef __NO_STRICT_ALIGNMENT
366 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) {
367 m = ieee80211_realign(vap, m, sizeof(*eh));
368 if (m == NULL)
369 return NULL;
370 }
371 #endif /* !__NO_STRICT_ALIGNMENT */
372 if (llc != NULL) {
373 eh = mtod(m, struct ether_header *);
374 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh));
375 }
376 return m;
377 }
378
379 /*
380 * Decap a frame encapsulated in a fast-frame/A-MSDU.
381 */
382 struct mbuf *
ieee80211_decap1(struct mbuf * m,int * framelen)383 ieee80211_decap1(struct mbuf *m, int *framelen)
384 {
385 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc))
386 struct ether_header *eh;
387 struct llc *llc;
388 const uint8_t llc_hdr_mac[ETHER_ADDR_LEN] = {
389 /* MAC address matching the 802.2 LLC header */
390 LLC_SNAP_LSAP, LLC_SNAP_LSAP, LLC_UI, 0, 0, 0
391 };
392
393 /*
394 * The frame has an 802.3 header followed by an 802.2
395 * LLC header. The encapsulated frame length is in the
396 * first header type field; save that and overwrite it
397 * with the true type field found in the second. Then
398 * copy the 802.3 header up to where it belongs and
399 * adjust the mbuf contents to remove the void.
400 */
401 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL)
402 return NULL;
403 eh = mtod(m, struct ether_header *); /* 802.3 header is first */
404
405 /*
406 * Detect possible attack where a single 802.11 frame is processed
407 * as an A-MSDU frame due to an adversary setting the A-MSDU present
408 * bit in the 802.11 QoS header. [FragAttacks]
409 */
410 if (memcmp(eh->ether_dhost, llc_hdr_mac, ETHER_ADDR_LEN) == 0)
411 return NULL;
412
413 llc = (struct llc *)&eh[1]; /* 802.2 header follows */
414 *framelen = ntohs(eh->ether_type) /* encap'd frame size */
415 + sizeof(struct ether_header) - sizeof(struct llc);
416 eh->ether_type = llc->llc_un.type_snap.ether_type;
417 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc),
418 sizeof(struct ether_header));
419 m_adj(m, sizeof(struct llc));
420 return m;
421 #undef FF_LLC_SIZE
422 }
423
424 /*
425 * Install received rate set information in the node's state block.
426 */
427 int
ieee80211_setup_rates(struct ieee80211_node * ni,const uint8_t * rates,const uint8_t * xrates,int flags)428 ieee80211_setup_rates(struct ieee80211_node *ni,
429 const uint8_t *rates, const uint8_t *xrates, int flags)
430 {
431 struct ieee80211vap *vap = ni->ni_vap;
432 struct ieee80211_rateset *rs = &ni->ni_rates;
433
434 memset(rs, 0, sizeof(*rs));
435 rs->rs_nrates = rates[1];
436 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates);
437 if (xrates != NULL) {
438 uint8_t nxrates;
439 /*
440 * Tack on 11g extended supported rate element.
441 */
442 nxrates = xrates[1];
443 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) {
444 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates;
445 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni,
446 "extended rate set too large; only using "
447 "%u of %u rates", nxrates, xrates[1]);
448 vap->iv_stats.is_rx_rstoobig++;
449 }
450 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates);
451 rs->rs_nrates += nxrates;
452 }
453 return ieee80211_fix_rate(ni, rs, flags);
454 }
455
456 /*
457 * Send a management frame error response to the specified
458 * station. If ni is associated with the station then use
459 * it; otherwise allocate a temporary node suitable for
460 * transmitting the frame and then free the reference so
461 * it will go away as soon as the frame has been transmitted.
462 */
463 void
ieee80211_send_error(struct ieee80211_node * ni,const uint8_t mac[IEEE80211_ADDR_LEN],int subtype,int arg)464 ieee80211_send_error(struct ieee80211_node *ni,
465 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg)
466 {
467 struct ieee80211vap *vap = ni->ni_vap;
468 int istmp;
469
470 if (ni == vap->iv_bss) {
471 if (vap->iv_state != IEEE80211_S_RUN) {
472 /*
473 * XXX hack until we get rid of this routine.
474 * We can be called prior to the vap reaching
475 * run state under certain conditions in which
476 * case iv_bss->ni_chan will not be setup.
477 * Check for this explicitly and and just ignore
478 * the request.
479 */
480 return;
481 }
482 ni = ieee80211_tmp_node(vap, mac);
483 if (ni == NULL) {
484 /* XXX msg */
485 return;
486 }
487 istmp = 1;
488 } else
489 istmp = 0;
490 IEEE80211_SEND_MGMT(ni, subtype, arg);
491 if (istmp)
492 ieee80211_free_node(ni);
493 }
494
495 int
ieee80211_alloc_challenge(struct ieee80211_node * ni)496 ieee80211_alloc_challenge(struct ieee80211_node *ni)
497 {
498 if (ni->ni_challenge == NULL)
499 ni->ni_challenge = (uint32_t *)
500 IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN,
501 M_80211_NODE, IEEE80211_M_NOWAIT);
502 if (ni->ni_challenge == NULL) {
503 IEEE80211_NOTE(ni->ni_vap,
504 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni,
505 "%s", "shared key challenge alloc failed");
506 /* XXX statistic */
507 }
508 return (ni->ni_challenge != NULL);
509 }
510
511 /*
512 * Parse a Beacon or ProbeResponse frame and return the
513 * useful information in an ieee80211_scanparams structure.
514 * Status is set to 0 if no problems were found; otherwise
515 * a bitmask of IEEE80211_BPARSE_* items is returned that
516 * describes the problems detected.
517 */
518 int
ieee80211_parse_beacon(struct ieee80211_node * ni,struct mbuf * m,struct ieee80211_channel * rxchan,struct ieee80211_scanparams * scan)519 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m,
520 struct ieee80211_channel *rxchan, struct ieee80211_scanparams *scan)
521 {
522 struct ieee80211vap *vap = ni->ni_vap;
523 struct ieee80211com *ic = ni->ni_ic;
524 struct ieee80211_frame *wh;
525 uint8_t *frm, *efrm;
526
527 wh = mtod(m, struct ieee80211_frame *);
528 frm = (uint8_t *)&wh[1];
529 efrm = mtod(m, uint8_t *) + m->m_len;
530 scan->status = 0;
531 /*
532 * beacon/probe response frame format
533 *
534 * XXX Update from 802.11-2012 - eg where HT is
535 * [8] time stamp
536 * [2] beacon interval
537 * [2] capability information
538 * [tlv] ssid
539 * [tlv] supported rates
540 * [tlv] country information
541 * [tlv] channel switch announcement (CSA)
542 * [tlv] parameter set (FH/DS)
543 * [tlv] erp information
544 * [tlv] extended supported rates
545 * [tlv] WME
546 * [tlv] WPA or RSN
547 * [tlv] HT capabilities
548 * [tlv] HT information
549 * [tlv] VHT capabilities
550 * [tlv] VHT information
551 * [tlv] Atheros capabilities
552 * [tlv] Mesh ID
553 * [tlv] Mesh Configuration
554 */
555 IEEE80211_VERIFY_LENGTH(efrm - frm, 12,
556 return (scan->status = IEEE80211_BPARSE_BADIELEN));
557 memset(scan, 0, sizeof(*scan));
558 scan->tstamp = frm; frm += 8;
559 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2;
560 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2;
561 scan->bchan = ieee80211_chan2ieee(ic, rxchan);
562 scan->chan = scan->bchan;
563 scan->ies = frm;
564 scan->ies_len = efrm - frm;
565
566 while (efrm - frm > 1) {
567 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2,
568 return (scan->status = IEEE80211_BPARSE_BADIELEN));
569 switch (*frm) {
570 case IEEE80211_ELEMID_SSID:
571 scan->ssid = frm;
572 break;
573 case IEEE80211_ELEMID_RATES:
574 scan->rates = frm;
575 break;
576 case IEEE80211_ELEMID_COUNTRY:
577 scan->country = frm;
578 break;
579 case IEEE80211_ELEMID_CSA:
580 scan->csa = frm;
581 break;
582 case IEEE80211_ELEMID_QUIET:
583 scan->quiet = frm;
584 break;
585 case IEEE80211_ELEMID_FHPARMS:
586 if (ic->ic_phytype == IEEE80211_T_FH) {
587 scan->fhdwell = le16dec(&frm[2]);
588 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]);
589 scan->fhindex = frm[6];
590 }
591 break;
592 case IEEE80211_ELEMID_DSPARMS:
593 /*
594 * XXX hack this since depending on phytype
595 * is problematic for multi-mode devices.
596 */
597 if (ic->ic_phytype != IEEE80211_T_FH)
598 scan->chan = frm[2];
599 break;
600 case IEEE80211_ELEMID_TIM:
601 /* XXX ATIM? */
602 scan->tim = frm;
603 scan->timoff = frm - mtod(m, uint8_t *);
604 break;
605 case IEEE80211_ELEMID_IBSSPARMS:
606 case IEEE80211_ELEMID_CFPARMS:
607 case IEEE80211_ELEMID_PWRCNSTR:
608 case IEEE80211_ELEMID_BSSLOAD:
609 case IEEE80211_ELEMID_APCHANREP:
610 /* NB: avoid debugging complaints */
611 break;
612 case IEEE80211_ELEMID_XRATES:
613 scan->xrates = frm;
614 break;
615 case IEEE80211_ELEMID_ERP:
616 if (frm[1] != 1) {
617 IEEE80211_DISCARD_IE(vap,
618 IEEE80211_MSG_ELEMID, wh, "ERP",
619 "bad len %u", frm[1]);
620 vap->iv_stats.is_rx_elem_toobig++;
621 break;
622 }
623 scan->erp = frm[2] | 0x100;
624 break;
625 case IEEE80211_ELEMID_HTCAP:
626 scan->htcap = frm;
627 break;
628 case IEEE80211_ELEMID_VHT_CAP:
629 scan->vhtcap = frm;
630 break;
631 case IEEE80211_ELEMID_VHT_OPMODE:
632 scan->vhtopmode = frm;
633 break;
634 case IEEE80211_ELEMID_RSN:
635 scan->rsn = frm;
636 break;
637 case IEEE80211_ELEMID_HTINFO:
638 scan->htinfo = frm;
639 break;
640 #ifdef IEEE80211_SUPPORT_MESH
641 case IEEE80211_ELEMID_MESHID:
642 scan->meshid = frm;
643 break;
644 case IEEE80211_ELEMID_MESHCONF:
645 scan->meshconf = frm;
646 break;
647 #endif
648 /* Extended capabilities; nothing handles it for now */
649 case IEEE80211_ELEMID_EXTCAP:
650 break;
651 case IEEE80211_ELEMID_VENDOR:
652 if (iswpaoui(frm))
653 scan->wpa = frm;
654 else if (iswmeparam(frm) || iswmeinfo(frm))
655 scan->wme = frm;
656 #ifdef IEEE80211_SUPPORT_SUPERG
657 else if (isatherosoui(frm))
658 scan->ath = frm;
659 #endif
660 #ifdef IEEE80211_SUPPORT_TDMA
661 else if (istdmaoui(frm))
662 scan->tdma = frm;
663 #endif
664 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
665 /*
666 * Accept pre-draft HT ie's if the
667 * standard ones have not been seen.
668 */
669 if (ishtcapoui(frm)) {
670 if (scan->htcap == NULL)
671 scan->htcap = frm;
672 } else if (ishtinfooui(frm)) {
673 if (scan->htinfo == NULL)
674 scan->htcap = frm;
675 }
676 }
677 break;
678 default:
679 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID,
680 wh, "unhandled",
681 "id %u, len %u", *frm, frm[1]);
682 vap->iv_stats.is_rx_elem_unknown++;
683 break;
684 }
685 frm += frm[1] + 2;
686 }
687 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE,
688 scan->status |= IEEE80211_BPARSE_RATES_INVALID);
689 if (scan->rates != NULL && scan->xrates != NULL) {
690 /*
691 * NB: don't process XRATES if RATES is missing. This
692 * avoids a potential null ptr deref and should be ok
693 * as the return code will already note RATES is missing
694 * (so callers shouldn't otherwise process the frame).
695 */
696 IEEE80211_VERIFY_ELEMENT(scan->xrates,
697 IEEE80211_RATE_MAXSIZE - scan->rates[1],
698 scan->status |= IEEE80211_BPARSE_XRATES_INVALID);
699 }
700 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN,
701 scan->status |= IEEE80211_BPARSE_SSID_INVALID);
702 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) {
703 /*
704 * Frame was received on a channel different from the
705 * one indicated in the DS params element id;
706 * silently discard it.
707 *
708 * NB: this can happen due to signal leakage.
709 * But we should take it for FH phy because
710 * the rssi value should be correct even for
711 * different hop pattern in FH.
712 */
713 IEEE80211_DISCARD(vap,
714 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
715 wh, NULL, "for off-channel %u (bchan=%u)",
716 scan->chan, scan->bchan);
717 vap->iv_stats.is_rx_chanmismatch++;
718 scan->status |= IEEE80211_BPARSE_OFFCHAN;
719 }
720 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval &&
721 scan->bintval <= IEEE80211_BINTVAL_MAX)) {
722 IEEE80211_DISCARD(vap,
723 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
724 wh, NULL, "bogus beacon interval (%d TU)",
725 (int) scan->bintval);
726 vap->iv_stats.is_rx_badbintval++;
727 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID;
728 }
729 if (scan->country != NULL) {
730 /*
731 * Validate we have at least enough data to extract
732 * the country code. Not sure if we should return an
733 * error instead of discarding the IE; consider this
734 * being lenient as we don't depend on the data for
735 * correct operation.
736 */
737 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t),
738 scan->country = NULL);
739 }
740 if (scan->csa != NULL) {
741 /*
742 * Validate Channel Switch Announcement; this must
743 * be the correct length or we toss the frame.
744 */
745 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t),
746 scan->status |= IEEE80211_BPARSE_CSA_INVALID);
747 }
748 #ifdef IEEE80211_SUPPORT_MESH
749 if (scan->meshid != NULL) {
750 IEEE80211_VERIFY_ELEMENT(scan->meshid, IEEE80211_MESHID_LEN,
751 scan->status |= IEEE80211_BPARSE_MESHID_INVALID);
752 }
753 #endif
754 /*
755 * Process HT ie's. This is complicated by our
756 * accepting both the standard ie's and the pre-draft
757 * vendor OUI ie's that some vendors still use/require.
758 */
759 if (scan->htcap != NULL) {
760 IEEE80211_VERIFY_LENGTH(scan->htcap[1],
761 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ?
762 4 + sizeof(struct ieee80211_ie_htcap)-2 :
763 sizeof(struct ieee80211_ie_htcap)-2,
764 scan->htcap = NULL);
765 }
766 if (scan->htinfo != NULL) {
767 IEEE80211_VERIFY_LENGTH(scan->htinfo[1],
768 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ?
769 4 + sizeof(struct ieee80211_ie_htinfo)-2 :
770 sizeof(struct ieee80211_ie_htinfo)-2,
771 scan->htinfo = NULL);
772 }
773
774 /* Process VHT IEs */
775 if (scan->vhtcap != NULL) {
776 IEEE80211_VERIFY_LENGTH(scan->vhtcap[1],
777 sizeof(struct ieee80211_vht_cap),
778 scan->vhtcap = NULL);
779 }
780 if (scan->vhtopmode != NULL) {
781 IEEE80211_VERIFY_LENGTH(scan->vhtopmode[1],
782 sizeof(struct ieee80211_vht_operation),
783 scan->vhtopmode = NULL);
784 }
785
786 return scan->status;
787 }
788
789 /*
790 * Parse an Action frame. Return 0 on success, non-zero on failure.
791 */
792 int
ieee80211_parse_action(struct ieee80211_node * ni,struct mbuf * m)793 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m)
794 {
795 struct ieee80211vap *vap = ni->ni_vap;
796 const struct ieee80211_action *ia;
797 struct ieee80211_frame *wh;
798 uint8_t *frm, *efrm;
799
800 /*
801 * action frame format:
802 * [1] category
803 * [1] action
804 * [tlv] parameters
805 */
806 wh = mtod(m, struct ieee80211_frame *);
807 frm = (u_int8_t *)&wh[1];
808 efrm = mtod(m, u_int8_t *) + m->m_len;
809 IEEE80211_VERIFY_LENGTH(efrm - frm,
810 sizeof(struct ieee80211_action), return EINVAL);
811 ia = (const struct ieee80211_action *) frm;
812
813 vap->iv_stats.is_rx_action++;
814 IEEE80211_NODE_STAT(ni, rx_action);
815
816 /* verify frame payloads but defer processing */
817 switch (ia->ia_category) {
818 case IEEE80211_ACTION_CAT_BA:
819 switch (ia->ia_action) {
820 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
821 IEEE80211_VERIFY_LENGTH(efrm - frm,
822 sizeof(struct ieee80211_action_ba_addbarequest),
823 return EINVAL);
824 break;
825 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
826 IEEE80211_VERIFY_LENGTH(efrm - frm,
827 sizeof(struct ieee80211_action_ba_addbaresponse),
828 return EINVAL);
829 break;
830 case IEEE80211_ACTION_BA_DELBA:
831 IEEE80211_VERIFY_LENGTH(efrm - frm,
832 sizeof(struct ieee80211_action_ba_delba),
833 return EINVAL);
834 break;
835 }
836 break;
837 case IEEE80211_ACTION_CAT_HT:
838 switch (ia->ia_action) {
839 case IEEE80211_ACTION_HT_TXCHWIDTH:
840 IEEE80211_VERIFY_LENGTH(efrm - frm,
841 sizeof(struct ieee80211_action_ht_txchwidth),
842 return EINVAL);
843 break;
844 case IEEE80211_ACTION_HT_MIMOPWRSAVE:
845 IEEE80211_VERIFY_LENGTH(efrm - frm,
846 sizeof(struct ieee80211_action_ht_mimopowersave),
847 return EINVAL);
848 break;
849 }
850 break;
851 #ifdef IEEE80211_SUPPORT_MESH
852 case IEEE80211_ACTION_CAT_MESH:
853 switch (ia->ia_action) {
854 case IEEE80211_ACTION_MESH_LMETRIC:
855 /*
856 * XXX: verification is true only if we are using
857 * Airtime link metric (default)
858 */
859 IEEE80211_VERIFY_LENGTH(efrm - frm,
860 sizeof(struct ieee80211_meshlmetric_ie),
861 return EINVAL);
862 break;
863 case IEEE80211_ACTION_MESH_HWMP:
864 /* verify something */
865 break;
866 case IEEE80211_ACTION_MESH_GANN:
867 IEEE80211_VERIFY_LENGTH(efrm - frm,
868 sizeof(struct ieee80211_meshgann_ie),
869 return EINVAL);
870 break;
871 case IEEE80211_ACTION_MESH_CC:
872 case IEEE80211_ACTION_MESH_MCCA_SREQ:
873 case IEEE80211_ACTION_MESH_MCCA_SREP:
874 case IEEE80211_ACTION_MESH_MCCA_AREQ:
875 case IEEE80211_ACTION_MESH_MCCA_ADVER:
876 case IEEE80211_ACTION_MESH_MCCA_TRDOWN:
877 case IEEE80211_ACTION_MESH_TBTT_REQ:
878 case IEEE80211_ACTION_MESH_TBTT_RES:
879 /* reject these early on, not implemented */
880 IEEE80211_DISCARD(vap,
881 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
882 wh, NULL, "not implemented yet, act=0x%02X",
883 ia->ia_action);
884 return EINVAL;
885 }
886 break;
887 case IEEE80211_ACTION_CAT_SELF_PROT:
888 /* If TA or RA group address discard silently */
889 if (IEEE80211_IS_MULTICAST(wh->i_addr1) ||
890 IEEE80211_IS_MULTICAST(wh->i_addr2))
891 return EINVAL;
892 /*
893 * XXX: Should we verify complete length now or it is
894 * to varying in sizes?
895 */
896 switch (ia->ia_action) {
897 case IEEE80211_ACTION_MESHPEERING_CONFIRM:
898 case IEEE80211_ACTION_MESHPEERING_CLOSE:
899 /* is not a peering candidate (yet) */
900 if (ni == vap->iv_bss)
901 return EINVAL;
902 break;
903 }
904 break;
905 #endif
906 case IEEE80211_ACTION_CAT_VHT:
907 printf("%s: TODO: VHT handling!\n", __func__);
908 break;
909 }
910 return 0;
911 }
912
913 #ifdef IEEE80211_DEBUG
914 /*
915 * Debugging support.
916 */
917 void
ieee80211_ssid_mismatch(struct ieee80211vap * vap,const char * tag,uint8_t mac[IEEE80211_ADDR_LEN],uint8_t * ssid)918 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag,
919 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid)
920 {
921 printf("[%s] discard %s frame, ssid mismatch: ",
922 ether_sprintf(mac), tag);
923 ieee80211_print_essid(ssid + 2, ssid[1]);
924 printf("\n");
925 }
926
927 /*
928 * Return the bssid of a frame.
929 */
930 static const uint8_t *
ieee80211_getbssid(const struct ieee80211vap * vap,const struct ieee80211_frame * wh)931 ieee80211_getbssid(const struct ieee80211vap *vap,
932 const struct ieee80211_frame *wh)
933 {
934 if (vap->iv_opmode == IEEE80211_M_STA)
935 return wh->i_addr2;
936 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS)
937 return wh->i_addr1;
938 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL)
939 return wh->i_addr1;
940 return wh->i_addr3;
941 }
942
943 #include <machine/stdarg.h>
944
945 void
ieee80211_note(const struct ieee80211vap * vap,const char * fmt,...)946 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...)
947 {
948 char buf[256]; /* XXX */
949 va_list ap;
950 int len;
951
952 va_start(ap, fmt);
953 len = vsnprintf(buf, sizeof(buf), fmt, ap);
954 va_end(ap);
955
956 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */
957
958 if (len >= sizeof(buf))
959 printf("%s: XXX buffer too small: len = %d\n", __func__, len);
960 }
961
962 void
ieee80211_note_frame(const struct ieee80211vap * vap,const struct ieee80211_frame * wh,const char * fmt,...)963 ieee80211_note_frame(const struct ieee80211vap *vap,
964 const struct ieee80211_frame *wh,
965 const char *fmt, ...)
966 {
967 char buf[256]; /* XXX */
968 va_list ap;
969 int len;
970
971 va_start(ap, fmt);
972 len = vsnprintf(buf, sizeof(buf), fmt, ap);
973 va_end(ap);
974 if_printf(vap->iv_ifp, "[%s] %s\n",
975 ether_sprintf(ieee80211_getbssid(vap, wh)), buf);
976
977 if (len >= sizeof(buf))
978 printf("%s: XXX buffer too small: len = %d\n", __func__, len);
979 }
980
981 void
ieee80211_note_mac(const struct ieee80211vap * vap,const uint8_t mac[IEEE80211_ADDR_LEN],const char * fmt,...)982 ieee80211_note_mac(const struct ieee80211vap *vap,
983 const uint8_t mac[IEEE80211_ADDR_LEN],
984 const char *fmt, ...)
985 {
986 char buf[256]; /* XXX */
987 va_list ap;
988 int len;
989
990 va_start(ap, fmt);
991 len = vsnprintf(buf, sizeof(buf), fmt, ap);
992 va_end(ap);
993 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf);
994
995 if (len >= sizeof(buf))
996 printf("%s: XXX buffer too small: len = %d\n", __func__, len);
997 }
998
999 void
ieee80211_discard_frame(const struct ieee80211vap * vap,const struct ieee80211_frame * wh,const char * type,const char * fmt,...)1000 ieee80211_discard_frame(const struct ieee80211vap *vap,
1001 const struct ieee80211_frame *wh,
1002 const char *type, const char *fmt, ...)
1003 {
1004 char buf[256]; /* XXX */
1005 va_list ap;
1006 int len;
1007
1008 va_start(ap, fmt);
1009 len = vsnprintf(buf, sizeof(buf), fmt, ap);
1010 va_end(ap);
1011
1012 if_printf(vap->iv_ifp, "[%s] discard %s frame, %s\n",
1013 ether_sprintf(ieee80211_getbssid(vap, wh)),
1014 type != NULL ? type : ieee80211_mgt_subtype_name(wh->i_fc[0]),
1015 buf);
1016
1017 if (len >= sizeof(buf))
1018 printf("%s: XXX buffer too small: len = %d\n", __func__, len);
1019 }
1020
1021 void
ieee80211_discard_ie(const struct ieee80211vap * vap,const struct ieee80211_frame * wh,const char * type,const char * fmt,...)1022 ieee80211_discard_ie(const struct ieee80211vap *vap,
1023 const struct ieee80211_frame *wh,
1024 const char *type, const char *fmt, ...)
1025 {
1026 char buf[256]; /* XXX */
1027 va_list ap;
1028 int len;
1029
1030 va_start(ap, fmt);
1031 len = vsnprintf(buf, sizeof(buf), fmt, ap);
1032 va_end(ap);
1033
1034 if_printf(vap->iv_ifp, "[%s] discard%s%s information element, %s\n",
1035 ether_sprintf(ieee80211_getbssid(vap, wh)),
1036 type != NULL ? " " : "", type != NULL ? type : "", buf);
1037
1038 if (len >= sizeof(buf))
1039 printf("%s: XXX buffer too small: len = %d\n", __func__, len);
1040 }
1041
1042 void
ieee80211_discard_mac(const struct ieee80211vap * vap,const uint8_t mac[IEEE80211_ADDR_LEN],const char * type,const char * fmt,...)1043 ieee80211_discard_mac(const struct ieee80211vap *vap,
1044 const uint8_t mac[IEEE80211_ADDR_LEN],
1045 const char *type, const char *fmt, ...)
1046 {
1047 char buf[256]; /* XXX */
1048 va_list ap;
1049 int len;
1050
1051 va_start(ap, fmt);
1052 len = vsnprintf(buf, sizeof(buf), fmt, ap);
1053 va_end(ap);
1054
1055 if_printf(vap->iv_ifp, "[%s] discard%s%s frame, %s\n",
1056 ether_sprintf(mac),
1057 type != NULL ? " " : "", type != NULL ? type : "", buf);
1058
1059 if (len >= sizeof(buf))
1060 printf("%s: XXX buffer too small: len = %d\n", __func__, len);
1061 }
1062 #endif /* IEEE80211_DEBUG */
1063