1 /*-
2 * Copyright (c) 2001 Atsushi Onoe
3 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: releng/10.2/sys/net80211/ieee80211_input.c 254640 2013-08-22 05:53:47Z adrian $");
29
30 #include "opt_wlan.h"
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/mbuf.h>
35 #include <sys/malloc.h>
36 #include <sys/endian.h>
37 #include <sys/kernel.h>
38
39 #include <sys/socket.h>
40
41 #include <net/ethernet.h>
42 #include <net/if.h>
43 #include <net/if_llc.h>
44 #include <net/if_media.h>
45 #include <net/if_vlan_var.h>
46
47 #include <net80211/ieee80211_var.h>
48 #include <net80211/ieee80211_input.h>
49 #ifdef IEEE80211_SUPPORT_MESH
50 #include <net80211/ieee80211_mesh.h>
51 #endif
52
53 #include <net/bpf.h>
54
55 #ifdef INET
56 #include <netinet/in.h>
57 #include <net/ethernet.h>
58 #endif
59
60 static void
61 ieee80211_process_mimo(struct ieee80211_node *ni, struct ieee80211_rx_stats *rx)
62 {
63 int i;
64
65 /* Verify the required MIMO bits are set */
66 if ((rx->r_flags & (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI)) !=
67 (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI))
68 return;
69
70 /* XXX This assumes the MIMO radios have both ctl and ext chains */
71 for (i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) {
72 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ctl[i], rx->c_rssi_ctl[i]);
73 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ext[i], rx->c_rssi_ext[i]);
74 }
75
76 /* XXX This also assumes the MIMO radios have both ctl and ext chains */
77 for(i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) {
78 ni->ni_mimo_noise_ctl[i] = rx->c_nf_ctl[i];
79 ni->ni_mimo_noise_ext[i] = rx->c_nf_ext[i];
80 }
81 ni->ni_mimo_chains = rx->c_chain;
82 }
83
84 int
85 ieee80211_input_mimo(struct ieee80211_node *ni, struct mbuf *m,
86 struct ieee80211_rx_stats *rx)
87 {
88 /* XXX should assert IEEE80211_R_NF and IEEE80211_R_RSSI are set */
89 ieee80211_process_mimo(ni, rx);
90 return ieee80211_input(ni, m, rx->rssi, rx->nf);
91 }
92
93 int
94 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf)
95 {
96 struct ieee80211_rx_stats rx;
97
98 rx.r_flags = IEEE80211_R_NF | IEEE80211_R_RSSI;
99 rx.nf = nf;
100 rx.rssi = rssi;
101 return ieee80211_input_mimo_all(ic, m, &rx);
102 }
103
104 int
105 ieee80211_input_mimo_all(struct ieee80211com *ic, struct mbuf *m,
106 struct ieee80211_rx_stats *rx)
107 {
108 struct ieee80211vap *vap;
109 int type = -1;
110
111 m->m_flags |= M_BCAST; /* NB: mark for bpf tap'ing */
112
113 /* XXX locking */
114 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
115 struct ieee80211_node *ni;
116 struct mbuf *mcopy;
117
118 /* NB: could check for IFF_UP but this is cheaper */
119 if (vap->iv_state == IEEE80211_S_INIT)
120 continue;
121 /*
122 * WDS vap's only receive directed traffic from the
123 * station at the ``far end''. That traffic should
124 * be passed through the AP vap the station is associated
125 * to--so don't spam them with mcast frames.
126 */
127 if (vap->iv_opmode == IEEE80211_M_WDS)
128 continue;
129 if (TAILQ_NEXT(vap, iv_next) != NULL) {
130 /*
131 * Packet contents are changed by ieee80211_decap
132 * so do a deep copy of the packet.
133 */
134 mcopy = m_dup(m, M_NOWAIT);
135 if (mcopy == NULL) {
136 /* XXX stat+msg */
137 continue;
138 }
139 } else {
140 mcopy = m;
141 m = NULL;
142 }
143 ni = ieee80211_ref_node(vap->iv_bss);
144 type = ieee80211_input_mimo(ni, mcopy, rx);
145 ieee80211_free_node(ni);
146 }
147 if (m != NULL) /* no vaps, reclaim mbuf */
148 m_freem(m);
149 return type;
150 }
151
152 /*
153 * This function reassembles fragments.
154 *
155 * XXX should handle 3 concurrent reassemblies per-spec.
156 */
157 struct mbuf *
158 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace)
159 {
160 struct ieee80211vap *vap = ni->ni_vap;
161 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
162 struct ieee80211_frame *lwh;
163 uint16_t rxseq;
164 uint8_t fragno;
165 uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG;
166 struct mbuf *mfrag;
167
168 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?"));
169
170 rxseq = le16toh(*(uint16_t *)wh->i_seq);
171 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK;
172
173 /* Quick way out, if there's nothing to defragment */
174 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL)
175 return m;
176
177 /*
178 * Remove frag to insure it doesn't get reaped by timer.
179 */
180 if (ni->ni_table == NULL) {
181 /*
182 * Should never happen. If the node is orphaned (not in
183 * the table) then input packets should not reach here.
184 * Otherwise, a concurrent request that yanks the table
185 * should be blocked by other interlocking and/or by first
186 * shutting the driver down. Regardless, be defensive
187 * here and just bail
188 */
189 /* XXX need msg+stat */
190 m_freem(m);
191 return NULL;
192 }
193 IEEE80211_NODE_LOCK(ni->ni_table);
194 mfrag = ni->ni_rxfrag[0];
195 ni->ni_rxfrag[0] = NULL;
196 IEEE80211_NODE_UNLOCK(ni->ni_table);
197
198 /*
199 * Validate new fragment is in order and
200 * related to the previous ones.
201 */
202 if (mfrag != NULL) {
203 uint16_t last_rxseq;
204
205 lwh = mtod(mfrag, struct ieee80211_frame *);
206 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq);
207 /* NB: check seq # and frag together */
208 if (rxseq != last_rxseq+1 ||
209 !IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) ||
210 !IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) {
211 /*
212 * Unrelated fragment or no space for it,
213 * clear current fragments.
214 */
215 m_freem(mfrag);
216 mfrag = NULL;
217 }
218 }
219
220 if (mfrag == NULL) {
221 if (fragno != 0) { /* !first fragment, discard */
222 vap->iv_stats.is_rx_defrag++;
223 IEEE80211_NODE_STAT(ni, rx_defrag);
224 m_freem(m);
225 return NULL;
226 }
227 mfrag = m;
228 } else { /* concatenate */
229 m_adj(m, hdrspace); /* strip header */
230 m_cat(mfrag, m);
231 /* NB: m_cat doesn't update the packet header */
232 mfrag->m_pkthdr.len += m->m_pkthdr.len;
233 /* track last seqnum and fragno */
234 lwh = mtod(mfrag, struct ieee80211_frame *);
235 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq;
236 }
237 if (more_frag) { /* more to come, save */
238 ni->ni_rxfragstamp = ticks;
239 ni->ni_rxfrag[0] = mfrag;
240 mfrag = NULL;
241 }
242 return mfrag;
243 }
244
245 void
246 ieee80211_deliver_data(struct ieee80211vap *vap,
247 struct ieee80211_node *ni, struct mbuf *m)
248 {
249 struct ether_header *eh = mtod(m, struct ether_header *);
250 struct ifnet *ifp = vap->iv_ifp;
251
252 /* clear driver/net80211 flags before passing up */
253 m->m_flags &= ~(M_MCAST | M_BCAST);
254 #if __FreeBSD_version >= 1000046
255 m_clrprotoflags(m);
256 #endif
257
258 /* NB: see hostap_deliver_data, this path doesn't handle hostap */
259 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap"));
260 /*
261 * Do accounting.
262 */
263 ifp->if_ipackets++;
264 IEEE80211_NODE_STAT(ni, rx_data);
265 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
266 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
267 m->m_flags |= M_MCAST; /* XXX M_BCAST? */
268 IEEE80211_NODE_STAT(ni, rx_mcast);
269 } else
270 IEEE80211_NODE_STAT(ni, rx_ucast);
271 m->m_pkthdr.rcvif = ifp;
272
273 if (ni->ni_vlan != 0) {
274 /* attach vlan tag */
275 m->m_pkthdr.ether_vtag = ni->ni_vlan;
276 m->m_flags |= M_VLANTAG;
277 }
278 ifp->if_input(ifp, m);
279 }
280
281 struct mbuf *
282 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen)
283 {
284 struct ieee80211_qosframe_addr4 wh;
285 struct ether_header *eh;
286 struct llc *llc;
287
288 KASSERT(hdrlen <= sizeof(wh),
289 ("hdrlen %d > max %zd", hdrlen, sizeof(wh)));
290
291 if (m->m_len < hdrlen + sizeof(*llc) &&
292 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) {
293 vap->iv_stats.is_rx_tooshort++;
294 /* XXX msg */
295 return NULL;
296 }
297 memcpy(&wh, mtod(m, caddr_t), hdrlen);
298 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen);
299 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP &&
300 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 &&
301 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 &&
302 /* NB: preserve AppleTalk frames that have a native SNAP hdr */
303 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) ||
304 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) {
305 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh));
306 llc = NULL;
307 } else {
308 m_adj(m, hdrlen - sizeof(*eh));
309 }
310 eh = mtod(m, struct ether_header *);
311 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) {
312 case IEEE80211_FC1_DIR_NODS:
313 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
314 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
315 break;
316 case IEEE80211_FC1_DIR_TODS:
317 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
318 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
319 break;
320 case IEEE80211_FC1_DIR_FROMDS:
321 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
322 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3);
323 break;
324 case IEEE80211_FC1_DIR_DSTODS:
325 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
326 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4);
327 break;
328 }
329 #ifndef __NO_STRICT_ALIGNMENT
330 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) {
331 m = ieee80211_realign(vap, m, sizeof(*eh));
332 if (m == NULL)
333 return NULL;
334 }
335 #endif /* !__NO_STRICT_ALIGNMENT */
336 if (llc != NULL) {
337 eh = mtod(m, struct ether_header *);
338 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh));
339 }
340 return m;
341 }
342
343 /*
344 * Decap a frame encapsulated in a fast-frame/A-MSDU.
345 */
346 struct mbuf *
347 ieee80211_decap1(struct mbuf *m, int *framelen)
348 {
349 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc))
350 struct ether_header *eh;
351 struct llc *llc;
352
353 /*
354 * The frame has an 802.3 header followed by an 802.2
355 * LLC header. The encapsulated frame length is in the
356 * first header type field; save that and overwrite it
357 * with the true type field found in the second. Then
358 * copy the 802.3 header up to where it belongs and
359 * adjust the mbuf contents to remove the void.
360 */
361 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL)
362 return NULL;
363 eh = mtod(m, struct ether_header *); /* 802.3 header is first */
364 llc = (struct llc *)&eh[1]; /* 802.2 header follows */
365 *framelen = ntohs(eh->ether_type) /* encap'd frame size */
366 + sizeof(struct ether_header) - sizeof(struct llc);
367 eh->ether_type = llc->llc_un.type_snap.ether_type;
368 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc),
369 sizeof(struct ether_header));
370 m_adj(m, sizeof(struct llc));
371 return m;
372 #undef FF_LLC_SIZE
373 }
374
375 /*
376 * Install received rate set information in the node's state block.
377 */
378 int
379 ieee80211_setup_rates(struct ieee80211_node *ni,
380 const uint8_t *rates, const uint8_t *xrates, int flags)
381 {
382 struct ieee80211vap *vap = ni->ni_vap;
383 struct ieee80211_rateset *rs = &ni->ni_rates;
384
385 memset(rs, 0, sizeof(*rs));
386 rs->rs_nrates = rates[1];
387 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates);
388 if (xrates != NULL) {
389 uint8_t nxrates;
390 /*
391 * Tack on 11g extended supported rate element.
392 */
393 nxrates = xrates[1];
394 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) {
395 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates;
396 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni,
397 "extended rate set too large; only using "
398 "%u of %u rates", nxrates, xrates[1]);
399 vap->iv_stats.is_rx_rstoobig++;
400 }
401 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates);
402 rs->rs_nrates += nxrates;
403 }
404 return ieee80211_fix_rate(ni, rs, flags);
405 }
406
407 /*
408 * Send a management frame error response to the specified
409 * station. If ni is associated with the station then use
410 * it; otherwise allocate a temporary node suitable for
411 * transmitting the frame and then free the reference so
412 * it will go away as soon as the frame has been transmitted.
413 */
414 void
415 ieee80211_send_error(struct ieee80211_node *ni,
416 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg)
417 {
418 struct ieee80211vap *vap = ni->ni_vap;
419 int istmp;
420
421 if (ni == vap->iv_bss) {
422 if (vap->iv_state != IEEE80211_S_RUN) {
423 /*
424 * XXX hack until we get rid of this routine.
425 * We can be called prior to the vap reaching
426 * run state under certain conditions in which
427 * case iv_bss->ni_chan will not be setup.
428 * Check for this explicitly and and just ignore
429 * the request.
430 */
431 return;
432 }
433 ni = ieee80211_tmp_node(vap, mac);
434 if (ni == NULL) {
435 /* XXX msg */
436 return;
437 }
438 istmp = 1;
439 } else
440 istmp = 0;
441 IEEE80211_SEND_MGMT(ni, subtype, arg);
442 if (istmp)
443 ieee80211_free_node(ni);
444 }
445
446 int
447 ieee80211_alloc_challenge(struct ieee80211_node *ni)
448 {
449 if (ni->ni_challenge == NULL)
450 ni->ni_challenge = (uint32_t *) malloc(IEEE80211_CHALLENGE_LEN,
451 M_80211_NODE, M_NOWAIT);
452 if (ni->ni_challenge == NULL) {
453 IEEE80211_NOTE(ni->ni_vap,
454 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni,
455 "%s", "shared key challenge alloc failed");
456 /* XXX statistic */
457 }
458 return (ni->ni_challenge != NULL);
459 }
460
461 /*
462 * Parse a Beacon or ProbeResponse frame and return the
463 * useful information in an ieee80211_scanparams structure.
464 * Status is set to 0 if no problems were found; otherwise
465 * a bitmask of IEEE80211_BPARSE_* items is returned that
466 * describes the problems detected.
467 */
468 int
469 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m,
470 struct ieee80211_scanparams *scan)
471 {
472 struct ieee80211vap *vap = ni->ni_vap;
473 struct ieee80211com *ic = ni->ni_ic;
474 struct ieee80211_frame *wh;
475 uint8_t *frm, *efrm;
476
477 wh = mtod(m, struct ieee80211_frame *);
478 frm = (uint8_t *)&wh[1];
479 efrm = mtod(m, uint8_t *) + m->m_len;
480 scan->status = 0;
481 /*
482 * beacon/probe response frame format
483 * [8] time stamp
484 * [2] beacon interval
485 * [2] capability information
486 * [tlv] ssid
487 * [tlv] supported rates
488 * [tlv] country information
489 * [tlv] channel switch announcement (CSA)
490 * [tlv] parameter set (FH/DS)
491 * [tlv] erp information
492 * [tlv] extended supported rates
493 * [tlv] WME
494 * [tlv] WPA or RSN
495 * [tlv] HT capabilities
496 * [tlv] HT information
497 * [tlv] Atheros capabilities
498 * [tlv] Mesh ID
499 * [tlv] Mesh Configuration
500 */
501 IEEE80211_VERIFY_LENGTH(efrm - frm, 12,
502 return (scan->status = IEEE80211_BPARSE_BADIELEN));
503 memset(scan, 0, sizeof(*scan));
504 scan->tstamp = frm; frm += 8;
505 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2;
506 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2;
507 scan->bchan = ieee80211_chan2ieee(ic, ic->ic_curchan);
508 scan->chan = scan->bchan;
509 scan->ies = frm;
510 scan->ies_len = efrm - frm;
511
512 while (efrm - frm > 1) {
513 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2,
514 return (scan->status = IEEE80211_BPARSE_BADIELEN));
515 switch (*frm) {
516 case IEEE80211_ELEMID_SSID:
517 scan->ssid = frm;
518 break;
519 case IEEE80211_ELEMID_RATES:
520 scan->rates = frm;
521 break;
522 case IEEE80211_ELEMID_COUNTRY:
523 scan->country = frm;
524 break;
525 case IEEE80211_ELEMID_CSA:
526 scan->csa = frm;
527 break;
528 case IEEE80211_ELEMID_QUIET:
529 scan->quiet = frm;
530 break;
531 case IEEE80211_ELEMID_FHPARMS:
532 if (ic->ic_phytype == IEEE80211_T_FH) {
533 scan->fhdwell = LE_READ_2(&frm[2]);
534 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]);
535 scan->fhindex = frm[6];
536 }
537 break;
538 case IEEE80211_ELEMID_DSPARMS:
539 /*
540 * XXX hack this since depending on phytype
541 * is problematic for multi-mode devices.
542 */
543 if (ic->ic_phytype != IEEE80211_T_FH)
544 scan->chan = frm[2];
545 break;
546 case IEEE80211_ELEMID_TIM:
547 /* XXX ATIM? */
548 scan->tim = frm;
549 scan->timoff = frm - mtod(m, uint8_t *);
550 break;
551 case IEEE80211_ELEMID_IBSSPARMS:
552 case IEEE80211_ELEMID_CFPARMS:
553 case IEEE80211_ELEMID_PWRCNSTR:
554 /* NB: avoid debugging complaints */
555 break;
556 case IEEE80211_ELEMID_XRATES:
557 scan->xrates = frm;
558 break;
559 case IEEE80211_ELEMID_ERP:
560 if (frm[1] != 1) {
561 IEEE80211_DISCARD_IE(vap,
562 IEEE80211_MSG_ELEMID, wh, "ERP",
563 "bad len %u", frm[1]);
564 vap->iv_stats.is_rx_elem_toobig++;
565 break;
566 }
567 scan->erp = frm[2] | 0x100;
568 break;
569 case IEEE80211_ELEMID_HTCAP:
570 scan->htcap = frm;
571 break;
572 case IEEE80211_ELEMID_RSN:
573 scan->rsn = frm;
574 break;
575 case IEEE80211_ELEMID_HTINFO:
576 scan->htinfo = frm;
577 break;
578 #ifdef IEEE80211_SUPPORT_MESH
579 case IEEE80211_ELEMID_MESHID:
580 scan->meshid = frm;
581 break;
582 case IEEE80211_ELEMID_MESHCONF:
583 scan->meshconf = frm;
584 break;
585 #endif
586 case IEEE80211_ELEMID_VENDOR:
587 if (iswpaoui(frm))
588 scan->wpa = frm;
589 else if (iswmeparam(frm) || iswmeinfo(frm))
590 scan->wme = frm;
591 #ifdef IEEE80211_SUPPORT_SUPERG
592 else if (isatherosoui(frm))
593 scan->ath = frm;
594 #endif
595 #ifdef IEEE80211_SUPPORT_TDMA
596 else if (istdmaoui(frm))
597 scan->tdma = frm;
598 #endif
599 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
600 /*
601 * Accept pre-draft HT ie's if the
602 * standard ones have not been seen.
603 */
604 if (ishtcapoui(frm)) {
605 if (scan->htcap == NULL)
606 scan->htcap = frm;
607 } else if (ishtinfooui(frm)) {
608 if (scan->htinfo == NULL)
609 scan->htcap = frm;
610 }
611 }
612 break;
613 default:
614 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID,
615 wh, "unhandled",
616 "id %u, len %u", *frm, frm[1]);
617 vap->iv_stats.is_rx_elem_unknown++;
618 break;
619 }
620 frm += frm[1] + 2;
621 }
622 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE,
623 scan->status |= IEEE80211_BPARSE_RATES_INVALID);
624 if (scan->rates != NULL && scan->xrates != NULL) {
625 /*
626 * NB: don't process XRATES if RATES is missing. This
627 * avoids a potential null ptr deref and should be ok
628 * as the return code will already note RATES is missing
629 * (so callers shouldn't otherwise process the frame).
630 */
631 IEEE80211_VERIFY_ELEMENT(scan->xrates,
632 IEEE80211_RATE_MAXSIZE - scan->rates[1],
633 scan->status |= IEEE80211_BPARSE_XRATES_INVALID);
634 }
635 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN,
636 scan->status |= IEEE80211_BPARSE_SSID_INVALID);
637 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) {
638 /*
639 * Frame was received on a channel different from the
640 * one indicated in the DS params element id;
641 * silently discard it.
642 *
643 * NB: this can happen due to signal leakage.
644 * But we should take it for FH phy because
645 * the rssi value should be correct even for
646 * different hop pattern in FH.
647 */
648 IEEE80211_DISCARD(vap,
649 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
650 wh, NULL, "for off-channel %u", scan->chan);
651 vap->iv_stats.is_rx_chanmismatch++;
652 scan->status |= IEEE80211_BPARSE_OFFCHAN;
653 }
654 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval &&
655 scan->bintval <= IEEE80211_BINTVAL_MAX)) {
656 IEEE80211_DISCARD(vap,
657 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
658 wh, NULL, "bogus beacon interval (%d TU)",
659 (int) scan->bintval);
660 vap->iv_stats.is_rx_badbintval++;
661 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID;
662 }
663 if (scan->country != NULL) {
664 /*
665 * Validate we have at least enough data to extract
666 * the country code. Not sure if we should return an
667 * error instead of discarding the IE; consider this
668 * being lenient as we don't depend on the data for
669 * correct operation.
670 */
671 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t),
672 scan->country = NULL);
673 }
674 if (scan->csa != NULL) {
675 /*
676 * Validate Channel Switch Announcement; this must
677 * be the correct length or we toss the frame.
678 */
679 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t),
680 scan->status |= IEEE80211_BPARSE_CSA_INVALID);
681 }
682 /*
683 * Process HT ie's. This is complicated by our
684 * accepting both the standard ie's and the pre-draft
685 * vendor OUI ie's that some vendors still use/require.
686 */
687 if (scan->htcap != NULL) {
688 IEEE80211_VERIFY_LENGTH(scan->htcap[1],
689 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ?
690 4 + sizeof(struct ieee80211_ie_htcap)-2 :
691 sizeof(struct ieee80211_ie_htcap)-2,
692 scan->htcap = NULL);
693 }
694 if (scan->htinfo != NULL) {
695 IEEE80211_VERIFY_LENGTH(scan->htinfo[1],
696 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ?
697 4 + sizeof(struct ieee80211_ie_htinfo)-2 :
698 sizeof(struct ieee80211_ie_htinfo)-2,
699 scan->htinfo = NULL);
700 }
701 return scan->status;
702 }
703
704 /*
705 * Parse an Action frame. Return 0 on success, non-zero on failure.
706 */
707 int
708 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m)
709 {
710 struct ieee80211vap *vap = ni->ni_vap;
711 const struct ieee80211_action *ia;
712 struct ieee80211_frame *wh;
713 uint8_t *frm, *efrm;
714
715 /*
716 * action frame format:
717 * [1] category
718 * [1] action
719 * [tlv] parameters
720 */
721 wh = mtod(m, struct ieee80211_frame *);
722 frm = (u_int8_t *)&wh[1];
723 efrm = mtod(m, u_int8_t *) + m->m_len;
724 IEEE80211_VERIFY_LENGTH(efrm - frm,
725 sizeof(struct ieee80211_action), return EINVAL);
726 ia = (const struct ieee80211_action *) frm;
727
728 vap->iv_stats.is_rx_action++;
729 IEEE80211_NODE_STAT(ni, rx_action);
730
731 /* verify frame payloads but defer processing */
732 switch (ia->ia_category) {
733 case IEEE80211_ACTION_CAT_BA:
734 switch (ia->ia_action) {
735 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
736 IEEE80211_VERIFY_LENGTH(efrm - frm,
737 sizeof(struct ieee80211_action_ba_addbarequest),
738 return EINVAL);
739 break;
740 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
741 IEEE80211_VERIFY_LENGTH(efrm - frm,
742 sizeof(struct ieee80211_action_ba_addbaresponse),
743 return EINVAL);
744 break;
745 case IEEE80211_ACTION_BA_DELBA:
746 IEEE80211_VERIFY_LENGTH(efrm - frm,
747 sizeof(struct ieee80211_action_ba_delba),
748 return EINVAL);
749 break;
750 }
751 break;
752 case IEEE80211_ACTION_CAT_HT:
753 switch (ia->ia_action) {
754 case IEEE80211_ACTION_HT_TXCHWIDTH:
755 IEEE80211_VERIFY_LENGTH(efrm - frm,
756 sizeof(struct ieee80211_action_ht_txchwidth),
757 return EINVAL);
758 break;
759 case IEEE80211_ACTION_HT_MIMOPWRSAVE:
760 IEEE80211_VERIFY_LENGTH(efrm - frm,
761 sizeof(struct ieee80211_action_ht_mimopowersave),
762 return EINVAL);
763 break;
764 }
765 break;
766 #ifdef IEEE80211_SUPPORT_MESH
767 case IEEE80211_ACTION_CAT_MESH:
768 switch (ia->ia_action) {
769 case IEEE80211_ACTION_MESH_LMETRIC:
770 /*
771 * XXX: verification is true only if we are using
772 * Airtime link metric (default)
773 */
774 IEEE80211_VERIFY_LENGTH(efrm - frm,
775 sizeof(struct ieee80211_meshlmetric_ie),
776 return EINVAL);
777 break;
778 case IEEE80211_ACTION_MESH_HWMP:
779 /* verify something */
780 break;
781 case IEEE80211_ACTION_MESH_GANN:
782 IEEE80211_VERIFY_LENGTH(efrm - frm,
783 sizeof(struct ieee80211_meshgann_ie),
784 return EINVAL);
785 break;
786 case IEEE80211_ACTION_MESH_CC:
787 case IEEE80211_ACTION_MESH_MCCA_SREQ:
788 case IEEE80211_ACTION_MESH_MCCA_SREP:
789 case IEEE80211_ACTION_MESH_MCCA_AREQ:
790 case IEEE80211_ACTION_MESH_MCCA_ADVER:
791 case IEEE80211_ACTION_MESH_MCCA_TRDOWN:
792 case IEEE80211_ACTION_MESH_TBTT_REQ:
793 case IEEE80211_ACTION_MESH_TBTT_RES:
794 /* reject these early on, not implemented */
795 IEEE80211_DISCARD(vap,
796 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
797 wh, NULL, "not implemented yet, act=0x%02X",
798 ia->ia_action);
799 return EINVAL;
800 }
801 break;
802 case IEEE80211_ACTION_CAT_SELF_PROT:
803 /* If TA or RA group address discard silently */
804 if (IEEE80211_IS_MULTICAST(wh->i_addr1) ||
805 IEEE80211_IS_MULTICAST(wh->i_addr2))
806 return EINVAL;
807 /*
808 * XXX: Should we verify complete length now or it is
809 * to varying in sizes?
810 */
811 switch (ia->ia_action) {
812 case IEEE80211_ACTION_MESHPEERING_CONFIRM:
813 case IEEE80211_ACTION_MESHPEERING_CLOSE:
814 /* is not a peering candidate (yet) */
815 if (ni == vap->iv_bss)
816 return EINVAL;
817 break;
818 }
819 break;
820 #endif
821 }
822 return 0;
823 }
824
825 #ifdef IEEE80211_DEBUG
826 /*
827 * Debugging support.
828 */
829 void
830 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag,
831 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid)
832 {
833 printf("[%s] discard %s frame, ssid mismatch: ",
834 ether_sprintf(mac), tag);
835 ieee80211_print_essid(ssid + 2, ssid[1]);
836 printf("\n");
837 }
838
839 /*
840 * Return the bssid of a frame.
841 */
842 static const uint8_t *
843 ieee80211_getbssid(const struct ieee80211vap *vap,
844 const struct ieee80211_frame *wh)
845 {
846 if (vap->iv_opmode == IEEE80211_M_STA)
847 return wh->i_addr2;
848 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS)
849 return wh->i_addr1;
850 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL)
851 return wh->i_addr1;
852 return wh->i_addr3;
853 }
854
855 #include <machine/stdarg.h>
856
857 void
858 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...)
859 {
860 char buf[128]; /* XXX */
861 va_list ap;
862
863 va_start(ap, fmt);
864 vsnprintf(buf, sizeof(buf), fmt, ap);
865 va_end(ap);
866
867 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */
868 }
869
870 void
871 ieee80211_note_frame(const struct ieee80211vap *vap,
872 const struct ieee80211_frame *wh,
873 const char *fmt, ...)
874 {
875 char buf[128]; /* XXX */
876 va_list ap;
877
878 va_start(ap, fmt);
879 vsnprintf(buf, sizeof(buf), fmt, ap);
880 va_end(ap);
881 if_printf(vap->iv_ifp, "[%s] %s\n",
882 ether_sprintf(ieee80211_getbssid(vap, wh)), buf);
883 }
884
885 void
886 ieee80211_note_mac(const struct ieee80211vap *vap,
887 const uint8_t mac[IEEE80211_ADDR_LEN],
888 const char *fmt, ...)
889 {
890 char buf[128]; /* XXX */
891 va_list ap;
892
893 va_start(ap, fmt);
894 vsnprintf(buf, sizeof(buf), fmt, ap);
895 va_end(ap);
896 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf);
897 }
898
899 void
900 ieee80211_discard_frame(const struct ieee80211vap *vap,
901 const struct ieee80211_frame *wh,
902 const char *type, const char *fmt, ...)
903 {
904 va_list ap;
905
906 if_printf(vap->iv_ifp, "[%s] discard ",
907 ether_sprintf(ieee80211_getbssid(vap, wh)));
908 if (type == NULL) {
909 printf("%s frame, ", ieee80211_mgt_subtype_name[
910 (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) >>
911 IEEE80211_FC0_SUBTYPE_SHIFT]);
912 } else
913 printf("%s frame, ", type);
914 va_start(ap, fmt);
915 vprintf(fmt, ap);
916 va_end(ap);
917 printf("\n");
918 }
919
920 void
921 ieee80211_discard_ie(const struct ieee80211vap *vap,
922 const struct ieee80211_frame *wh,
923 const char *type, const char *fmt, ...)
924 {
925 va_list ap;
926
927 if_printf(vap->iv_ifp, "[%s] discard ",
928 ether_sprintf(ieee80211_getbssid(vap, wh)));
929 if (type != NULL)
930 printf("%s information element, ", type);
931 else
932 printf("information element, ");
933 va_start(ap, fmt);
934 vprintf(fmt, ap);
935 va_end(ap);
936 printf("\n");
937 }
938
939 void
940 ieee80211_discard_mac(const struct ieee80211vap *vap,
941 const uint8_t mac[IEEE80211_ADDR_LEN],
942 const char *type, const char *fmt, ...)
943 {
944 va_list ap;
945
946 if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac));
947 if (type != NULL)
948 printf("%s frame, ", type);
949 else
950 printf("frame, ");
951 va_start(ap, fmt);
952 vprintf(fmt, ap);
953 va_end(ap);
954 printf("\n");
955 }
956 #endif /* IEEE80211_DEBUG */
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