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("$FreeBSD$");
29
30 #include "opt_wlan.h"
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/mbuf.h>
35 #include <sys/malloc.h>
36 #include <sys/endian.h>
37 #include <sys/kernel.h>
38
39 #include <sys/socket.h>
40
41 #include <net/ethernet.h>
42 #include <net/if.h>
43 #include <net/if_var.h>
44 #include <net/if_llc.h>
45 #include <net/if_media.h>
46 #include <net/if_vlan_var.h>
47
48 #include <net80211/ieee80211_var.h>
49 #include <net80211/ieee80211_input.h>
50 #ifdef IEEE80211_SUPPORT_MESH
51 #include <net80211/ieee80211_mesh.h>
52 #endif
53
54 #include <net/bpf.h>
55
56 #ifdef INET
57 #include <netinet/in.h>
58 #include <net/ethernet.h>
59 #endif
60
61 static void
ieee80211_process_mimo(struct ieee80211_node * ni,struct ieee80211_rx_stats * rx)62 ieee80211_process_mimo(struct ieee80211_node *ni, struct ieee80211_rx_stats *rx)
63 {
64 int i;
65
66 /* Verify the required MIMO bits are set */
67 if ((rx->r_flags & (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI)) !=
68 (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI))
69 return;
70
71 /* XXX This assumes the MIMO radios have both ctl and ext chains */
72 for (i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) {
73 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ctl[i], rx->c_rssi_ctl[i]);
74 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ext[i], rx->c_rssi_ext[i]);
75 }
76
77 /* XXX This also assumes the MIMO radios have both ctl and ext chains */
78 for(i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) {
79 ni->ni_mimo_noise_ctl[i] = rx->c_nf_ctl[i];
80 ni->ni_mimo_noise_ext[i] = rx->c_nf_ext[i];
81 }
82 ni->ni_mimo_chains = rx->c_chain;
83 }
84
85 int
ieee80211_input_mimo(struct ieee80211_node * ni,struct mbuf * m,struct ieee80211_rx_stats * rx)86 ieee80211_input_mimo(struct ieee80211_node *ni, struct mbuf *m,
87 struct ieee80211_rx_stats *rx)
88 {
89 struct ieee80211_rx_stats rxs;
90
91 if (rx) {
92 memcpy(&rxs, rx, sizeof(*rx));
93 } else {
94 /* try to read from mbuf */
95 bzero(&rxs, sizeof(rxs));
96 ieee80211_get_rx_params(m, &rxs);
97 }
98
99 /* XXX should assert IEEE80211_R_NF and IEEE80211_R_RSSI are set */
100 ieee80211_process_mimo(ni, &rxs);
101
102 //return ieee80211_input(ni, m, rx->rssi, rx->nf);
103 return ni->ni_vap->iv_input(ni, m, &rxs, rxs.rssi, rxs.nf);
104 }
105
106 int
ieee80211_input_all(struct ieee80211com * ic,struct mbuf * m,int rssi,int nf)107 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf)
108 {
109 struct ieee80211_rx_stats rx;
110
111 rx.r_flags = IEEE80211_R_NF | IEEE80211_R_RSSI;
112 rx.nf = nf;
113 rx.rssi = rssi;
114 return ieee80211_input_mimo_all(ic, m, &rx);
115 }
116
117 int
ieee80211_input_mimo_all(struct ieee80211com * ic,struct mbuf * m,struct ieee80211_rx_stats * rx)118 ieee80211_input_mimo_all(struct ieee80211com *ic, struct mbuf *m,
119 struct ieee80211_rx_stats *rx)
120 {
121 struct ieee80211_rx_stats rxs;
122 struct ieee80211vap *vap;
123 int type = -1;
124
125 m->m_flags |= M_BCAST; /* NB: mark for bpf tap'ing */
126
127 if (rx) {
128 memcpy(&rxs, rx, sizeof(*rx));
129 } else {
130 /* try to read from mbuf */
131 bzero(&rxs, sizeof(rxs));
132 ieee80211_get_rx_params(m, &rxs);
133 }
134
135 /* XXX locking */
136 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
137 struct ieee80211_node *ni;
138 struct mbuf *mcopy;
139
140 /* NB: could check for IFF_UP but this is cheaper */
141 if (vap->iv_state == IEEE80211_S_INIT)
142 continue;
143 /*
144 * WDS vap's only receive directed traffic from the
145 * station at the ``far end''. That traffic should
146 * be passed through the AP vap the station is associated
147 * to--so don't spam them with mcast frames.
148 */
149 if (vap->iv_opmode == IEEE80211_M_WDS)
150 continue;
151 if (TAILQ_NEXT(vap, iv_next) != NULL) {
152 /*
153 * Packet contents are changed by ieee80211_decap
154 * so do a deep copy of the packet.
155 */
156 mcopy = m_dup(m, M_NOWAIT);
157 if (mcopy == NULL) {
158 /* XXX stat+msg */
159 continue;
160 }
161 } else {
162 mcopy = m;
163 m = NULL;
164 }
165 ni = ieee80211_ref_node(vap->iv_bss);
166 type = ieee80211_input_mimo(ni, mcopy, &rxs);
167 ieee80211_free_node(ni);
168 }
169 if (m != NULL) /* no vaps, reclaim mbuf */
170 m_freem(m);
171 return type;
172 }
173
174 /*
175 * This function reassembles fragments.
176 *
177 * XXX should handle 3 concurrent reassemblies per-spec.
178 */
179 struct mbuf *
ieee80211_defrag(struct ieee80211_node * ni,struct mbuf * m,int hdrspace)180 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace)
181 {
182 struct ieee80211vap *vap = ni->ni_vap;
183 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
184 struct ieee80211_frame *lwh;
185 uint16_t rxseq;
186 uint8_t fragno;
187 uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG;
188 struct mbuf *mfrag;
189
190 KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?"));
191
192 rxseq = le16toh(*(uint16_t *)wh->i_seq);
193 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK;
194
195 /* Quick way out, if there's nothing to defragment */
196 if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL)
197 return m;
198
199 /*
200 * Remove frag to insure it doesn't get reaped by timer.
201 */
202 if (ni->ni_table == NULL) {
203 /*
204 * Should never happen. If the node is orphaned (not in
205 * the table) then input packets should not reach here.
206 * Otherwise, a concurrent request that yanks the table
207 * should be blocked by other interlocking and/or by first
208 * shutting the driver down. Regardless, be defensive
209 * here and just bail
210 */
211 /* XXX need msg+stat */
212 m_freem(m);
213 return NULL;
214 }
215 IEEE80211_NODE_LOCK(ni->ni_table);
216 mfrag = ni->ni_rxfrag[0];
217 ni->ni_rxfrag[0] = NULL;
218 IEEE80211_NODE_UNLOCK(ni->ni_table);
219
220 /*
221 * Validate new fragment is in order and
222 * related to the previous ones.
223 */
224 if (mfrag != NULL) {
225 uint16_t last_rxseq;
226
227 lwh = mtod(mfrag, struct ieee80211_frame *);
228 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq);
229 /* NB: check seq # and frag together */
230 if (rxseq != last_rxseq+1 ||
231 !IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) ||
232 !IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) {
233 /*
234 * Unrelated fragment or no space for it,
235 * clear current fragments.
236 */
237 m_freem(mfrag);
238 mfrag = NULL;
239 }
240 }
241
242 if (mfrag == NULL) {
243 if (fragno != 0) { /* !first fragment, discard */
244 vap->iv_stats.is_rx_defrag++;
245 IEEE80211_NODE_STAT(ni, rx_defrag);
246 m_freem(m);
247 return NULL;
248 }
249 mfrag = m;
250 } else { /* concatenate */
251 m_adj(m, hdrspace); /* strip header */
252 m_cat(mfrag, m);
253 /* NB: m_cat doesn't update the packet header */
254 mfrag->m_pkthdr.len += m->m_pkthdr.len;
255 /* track last seqnum and fragno */
256 lwh = mtod(mfrag, struct ieee80211_frame *);
257 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq;
258 }
259 if (more_frag) { /* more to come, save */
260 ni->ni_rxfragstamp = ticks;
261 ni->ni_rxfrag[0] = mfrag;
262 mfrag = NULL;
263 }
264 return mfrag;
265 }
266
267 void
ieee80211_deliver_data(struct ieee80211vap * vap,struct ieee80211_node * ni,struct mbuf * m)268 ieee80211_deliver_data(struct ieee80211vap *vap,
269 struct ieee80211_node *ni, struct mbuf *m)
270 {
271 struct ether_header *eh = mtod(m, struct ether_header *);
272 struct ifnet *ifp = vap->iv_ifp;
273
274 /* clear driver/net80211 flags before passing up */
275 m->m_flags &= ~(M_MCAST | M_BCAST);
276 m_clrprotoflags(m);
277
278 /* NB: see hostap_deliver_data, this path doesn't handle hostap */
279 KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap"));
280 /*
281 * Do accounting.
282 */
283 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
284 IEEE80211_NODE_STAT(ni, rx_data);
285 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
286 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
287 m->m_flags |= M_MCAST; /* XXX M_BCAST? */
288 IEEE80211_NODE_STAT(ni, rx_mcast);
289 } else
290 IEEE80211_NODE_STAT(ni, rx_ucast);
291 m->m_pkthdr.rcvif = ifp;
292
293 if (ni->ni_vlan != 0) {
294 /* attach vlan tag */
295 m->m_pkthdr.ether_vtag = ni->ni_vlan;
296 m->m_flags |= M_VLANTAG;
297 }
298 ifp->if_input(ifp, m);
299 }
300
301 struct mbuf *
ieee80211_decap(struct ieee80211vap * vap,struct mbuf * m,int hdrlen)302 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen)
303 {
304 struct ieee80211_qosframe_addr4 wh;
305 struct ether_header *eh;
306 struct llc *llc;
307
308 KASSERT(hdrlen <= sizeof(wh),
309 ("hdrlen %d > max %zd", hdrlen, sizeof(wh)));
310
311 if (m->m_len < hdrlen + sizeof(*llc) &&
312 (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) {
313 vap->iv_stats.is_rx_tooshort++;
314 /* XXX msg */
315 return NULL;
316 }
317 memcpy(&wh, mtod(m, caddr_t), hdrlen);
318 llc = (struct llc *)(mtod(m, caddr_t) + hdrlen);
319 if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP &&
320 llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 &&
321 llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 &&
322 /* NB: preserve AppleTalk frames that have a native SNAP hdr */
323 !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) ||
324 llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) {
325 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh));
326 llc = NULL;
327 } else {
328 m_adj(m, hdrlen - sizeof(*eh));
329 }
330 eh = mtod(m, struct ether_header *);
331 switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) {
332 case IEEE80211_FC1_DIR_NODS:
333 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
334 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
335 break;
336 case IEEE80211_FC1_DIR_TODS:
337 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
338 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
339 break;
340 case IEEE80211_FC1_DIR_FROMDS:
341 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
342 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3);
343 break;
344 case IEEE80211_FC1_DIR_DSTODS:
345 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
346 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4);
347 break;
348 }
349 #ifndef __NO_STRICT_ALIGNMENT
350 if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) {
351 m = ieee80211_realign(vap, m, sizeof(*eh));
352 if (m == NULL)
353 return NULL;
354 }
355 #endif /* !__NO_STRICT_ALIGNMENT */
356 if (llc != NULL) {
357 eh = mtod(m, struct ether_header *);
358 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh));
359 }
360 return m;
361 }
362
363 /*
364 * Decap a frame encapsulated in a fast-frame/A-MSDU.
365 */
366 struct mbuf *
ieee80211_decap1(struct mbuf * m,int * framelen)367 ieee80211_decap1(struct mbuf *m, int *framelen)
368 {
369 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc))
370 struct ether_header *eh;
371 struct llc *llc;
372
373 /*
374 * The frame has an 802.3 header followed by an 802.2
375 * LLC header. The encapsulated frame length is in the
376 * first header type field; save that and overwrite it
377 * with the true type field found in the second. Then
378 * copy the 802.3 header up to where it belongs and
379 * adjust the mbuf contents to remove the void.
380 */
381 if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL)
382 return NULL;
383 eh = mtod(m, struct ether_header *); /* 802.3 header is first */
384 llc = (struct llc *)&eh[1]; /* 802.2 header follows */
385 *framelen = ntohs(eh->ether_type) /* encap'd frame size */
386 + sizeof(struct ether_header) - sizeof(struct llc);
387 eh->ether_type = llc->llc_un.type_snap.ether_type;
388 ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc),
389 sizeof(struct ether_header));
390 m_adj(m, sizeof(struct llc));
391 return m;
392 #undef FF_LLC_SIZE
393 }
394
395 /*
396 * Install received rate set information in the node's state block.
397 */
398 int
ieee80211_setup_rates(struct ieee80211_node * ni,const uint8_t * rates,const uint8_t * xrates,int flags)399 ieee80211_setup_rates(struct ieee80211_node *ni,
400 const uint8_t *rates, const uint8_t *xrates, int flags)
401 {
402 struct ieee80211vap *vap = ni->ni_vap;
403 struct ieee80211_rateset *rs = &ni->ni_rates;
404
405 memset(rs, 0, sizeof(*rs));
406 rs->rs_nrates = rates[1];
407 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates);
408 if (xrates != NULL) {
409 uint8_t nxrates;
410 /*
411 * Tack on 11g extended supported rate element.
412 */
413 nxrates = xrates[1];
414 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) {
415 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates;
416 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni,
417 "extended rate set too large; only using "
418 "%u of %u rates", nxrates, xrates[1]);
419 vap->iv_stats.is_rx_rstoobig++;
420 }
421 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates);
422 rs->rs_nrates += nxrates;
423 }
424 return ieee80211_fix_rate(ni, rs, flags);
425 }
426
427 /*
428 * Send a management frame error response to the specified
429 * station. If ni is associated with the station then use
430 * it; otherwise allocate a temporary node suitable for
431 * transmitting the frame and then free the reference so
432 * it will go away as soon as the frame has been transmitted.
433 */
434 void
ieee80211_send_error(struct ieee80211_node * ni,const uint8_t mac[IEEE80211_ADDR_LEN],int subtype,int arg)435 ieee80211_send_error(struct ieee80211_node *ni,
436 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg)
437 {
438 struct ieee80211vap *vap = ni->ni_vap;
439 int istmp;
440
441 if (ni == vap->iv_bss) {
442 if (vap->iv_state != IEEE80211_S_RUN) {
443 /*
444 * XXX hack until we get rid of this routine.
445 * We can be called prior to the vap reaching
446 * run state under certain conditions in which
447 * case iv_bss->ni_chan will not be setup.
448 * Check for this explicitly and and just ignore
449 * the request.
450 */
451 return;
452 }
453 ni = ieee80211_tmp_node(vap, mac);
454 if (ni == NULL) {
455 /* XXX msg */
456 return;
457 }
458 istmp = 1;
459 } else
460 istmp = 0;
461 IEEE80211_SEND_MGMT(ni, subtype, arg);
462 if (istmp)
463 ieee80211_free_node(ni);
464 }
465
466 int
ieee80211_alloc_challenge(struct ieee80211_node * ni)467 ieee80211_alloc_challenge(struct ieee80211_node *ni)
468 {
469 if (ni->ni_challenge == NULL)
470 ni->ni_challenge = (uint32_t *)
471 IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN,
472 M_80211_NODE, IEEE80211_M_NOWAIT);
473 if (ni->ni_challenge == NULL) {
474 IEEE80211_NOTE(ni->ni_vap,
475 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni,
476 "%s", "shared key challenge alloc failed");
477 /* XXX statistic */
478 }
479 return (ni->ni_challenge != NULL);
480 }
481
482 /*
483 * Parse a Beacon or ProbeResponse frame and return the
484 * useful information in an ieee80211_scanparams structure.
485 * Status is set to 0 if no problems were found; otherwise
486 * a bitmask of IEEE80211_BPARSE_* items is returned that
487 * describes the problems detected.
488 */
489 int
ieee80211_parse_beacon(struct ieee80211_node * ni,struct mbuf * m,struct ieee80211_channel * rxchan,struct ieee80211_scanparams * scan)490 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m,
491 struct ieee80211_channel *rxchan, struct ieee80211_scanparams *scan)
492 {
493 struct ieee80211vap *vap = ni->ni_vap;
494 struct ieee80211com *ic = ni->ni_ic;
495 struct ieee80211_frame *wh;
496 uint8_t *frm, *efrm;
497
498 wh = mtod(m, struct ieee80211_frame *);
499 frm = (uint8_t *)&wh[1];
500 efrm = mtod(m, uint8_t *) + m->m_len;
501 scan->status = 0;
502 /*
503 * beacon/probe response frame format
504 * [8] time stamp
505 * [2] beacon interval
506 * [2] capability information
507 * [tlv] ssid
508 * [tlv] supported rates
509 * [tlv] country information
510 * [tlv] channel switch announcement (CSA)
511 * [tlv] parameter set (FH/DS)
512 * [tlv] erp information
513 * [tlv] extended supported rates
514 * [tlv] WME
515 * [tlv] WPA or RSN
516 * [tlv] HT capabilities
517 * [tlv] HT information
518 * [tlv] Atheros capabilities
519 * [tlv] Mesh ID
520 * [tlv] Mesh Configuration
521 */
522 IEEE80211_VERIFY_LENGTH(efrm - frm, 12,
523 return (scan->status = IEEE80211_BPARSE_BADIELEN));
524 memset(scan, 0, sizeof(*scan));
525 scan->tstamp = frm; frm += 8;
526 scan->bintval = le16toh(*(uint16_t *)frm); frm += 2;
527 scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2;
528 scan->bchan = ieee80211_chan2ieee(ic, rxchan);
529 scan->chan = scan->bchan;
530 scan->ies = frm;
531 scan->ies_len = efrm - frm;
532
533 while (efrm - frm > 1) {
534 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2,
535 return (scan->status = IEEE80211_BPARSE_BADIELEN));
536 switch (*frm) {
537 case IEEE80211_ELEMID_SSID:
538 scan->ssid = frm;
539 break;
540 case IEEE80211_ELEMID_RATES:
541 scan->rates = frm;
542 break;
543 case IEEE80211_ELEMID_COUNTRY:
544 scan->country = frm;
545 break;
546 case IEEE80211_ELEMID_CSA:
547 scan->csa = frm;
548 break;
549 case IEEE80211_ELEMID_QUIET:
550 scan->quiet = frm;
551 break;
552 case IEEE80211_ELEMID_FHPARMS:
553 if (ic->ic_phytype == IEEE80211_T_FH) {
554 scan->fhdwell = LE_READ_2(&frm[2]);
555 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]);
556 scan->fhindex = frm[6];
557 }
558 break;
559 case IEEE80211_ELEMID_DSPARMS:
560 /*
561 * XXX hack this since depending on phytype
562 * is problematic for multi-mode devices.
563 */
564 if (ic->ic_phytype != IEEE80211_T_FH)
565 scan->chan = frm[2];
566 break;
567 case IEEE80211_ELEMID_TIM:
568 /* XXX ATIM? */
569 scan->tim = frm;
570 scan->timoff = frm - mtod(m, uint8_t *);
571 break;
572 case IEEE80211_ELEMID_IBSSPARMS:
573 case IEEE80211_ELEMID_CFPARMS:
574 case IEEE80211_ELEMID_PWRCNSTR:
575 /* NB: avoid debugging complaints */
576 break;
577 case IEEE80211_ELEMID_XRATES:
578 scan->xrates = frm;
579 break;
580 case IEEE80211_ELEMID_ERP:
581 if (frm[1] != 1) {
582 IEEE80211_DISCARD_IE(vap,
583 IEEE80211_MSG_ELEMID, wh, "ERP",
584 "bad len %u", frm[1]);
585 vap->iv_stats.is_rx_elem_toobig++;
586 break;
587 }
588 scan->erp = frm[2] | 0x100;
589 break;
590 case IEEE80211_ELEMID_HTCAP:
591 scan->htcap = frm;
592 break;
593 case IEEE80211_ELEMID_RSN:
594 scan->rsn = frm;
595 break;
596 case IEEE80211_ELEMID_HTINFO:
597 scan->htinfo = frm;
598 break;
599 #ifdef IEEE80211_SUPPORT_MESH
600 case IEEE80211_ELEMID_MESHID:
601 scan->meshid = frm;
602 break;
603 case IEEE80211_ELEMID_MESHCONF:
604 scan->meshconf = frm;
605 break;
606 #endif
607 case IEEE80211_ELEMID_VENDOR:
608 if (iswpaoui(frm))
609 scan->wpa = frm;
610 else if (iswmeparam(frm) || iswmeinfo(frm))
611 scan->wme = frm;
612 #ifdef IEEE80211_SUPPORT_SUPERG
613 else if (isatherosoui(frm))
614 scan->ath = frm;
615 #endif
616 #ifdef IEEE80211_SUPPORT_TDMA
617 else if (istdmaoui(frm))
618 scan->tdma = frm;
619 #endif
620 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
621 /*
622 * Accept pre-draft HT ie's if the
623 * standard ones have not been seen.
624 */
625 if (ishtcapoui(frm)) {
626 if (scan->htcap == NULL)
627 scan->htcap = frm;
628 } else if (ishtinfooui(frm)) {
629 if (scan->htinfo == NULL)
630 scan->htcap = frm;
631 }
632 }
633 break;
634 default:
635 IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID,
636 wh, "unhandled",
637 "id %u, len %u", *frm, frm[1]);
638 vap->iv_stats.is_rx_elem_unknown++;
639 break;
640 }
641 frm += frm[1] + 2;
642 }
643 IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE,
644 scan->status |= IEEE80211_BPARSE_RATES_INVALID);
645 if (scan->rates != NULL && scan->xrates != NULL) {
646 /*
647 * NB: don't process XRATES if RATES is missing. This
648 * avoids a potential null ptr deref and should be ok
649 * as the return code will already note RATES is missing
650 * (so callers shouldn't otherwise process the frame).
651 */
652 IEEE80211_VERIFY_ELEMENT(scan->xrates,
653 IEEE80211_RATE_MAXSIZE - scan->rates[1],
654 scan->status |= IEEE80211_BPARSE_XRATES_INVALID);
655 }
656 IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN,
657 scan->status |= IEEE80211_BPARSE_SSID_INVALID);
658 if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) {
659 /*
660 * Frame was received on a channel different from the
661 * one indicated in the DS params element id;
662 * silently discard it.
663 *
664 * NB: this can happen due to signal leakage.
665 * But we should take it for FH phy because
666 * the rssi value should be correct even for
667 * different hop pattern in FH.
668 */
669 IEEE80211_DISCARD(vap,
670 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
671 wh, NULL, "for off-channel %u (bchan=%u)",
672 scan->chan, scan->bchan);
673 vap->iv_stats.is_rx_chanmismatch++;
674 scan->status |= IEEE80211_BPARSE_OFFCHAN;
675 }
676 if (!(IEEE80211_BINTVAL_MIN <= scan->bintval &&
677 scan->bintval <= IEEE80211_BINTVAL_MAX)) {
678 IEEE80211_DISCARD(vap,
679 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
680 wh, NULL, "bogus beacon interval (%d TU)",
681 (int) scan->bintval);
682 vap->iv_stats.is_rx_badbintval++;
683 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID;
684 }
685 if (scan->country != NULL) {
686 /*
687 * Validate we have at least enough data to extract
688 * the country code. Not sure if we should return an
689 * error instead of discarding the IE; consider this
690 * being lenient as we don't depend on the data for
691 * correct operation.
692 */
693 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t),
694 scan->country = NULL);
695 }
696 if (scan->csa != NULL) {
697 /*
698 * Validate Channel Switch Announcement; this must
699 * be the correct length or we toss the frame.
700 */
701 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t),
702 scan->status |= IEEE80211_BPARSE_CSA_INVALID);
703 }
704 /*
705 * Process HT ie's. This is complicated by our
706 * accepting both the standard ie's and the pre-draft
707 * vendor OUI ie's that some vendors still use/require.
708 */
709 if (scan->htcap != NULL) {
710 IEEE80211_VERIFY_LENGTH(scan->htcap[1],
711 scan->htcap[0] == IEEE80211_ELEMID_VENDOR ?
712 4 + sizeof(struct ieee80211_ie_htcap)-2 :
713 sizeof(struct ieee80211_ie_htcap)-2,
714 scan->htcap = NULL);
715 }
716 if (scan->htinfo != NULL) {
717 IEEE80211_VERIFY_LENGTH(scan->htinfo[1],
718 scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ?
719 4 + sizeof(struct ieee80211_ie_htinfo)-2 :
720 sizeof(struct ieee80211_ie_htinfo)-2,
721 scan->htinfo = NULL);
722 }
723 return scan->status;
724 }
725
726 /*
727 * Parse an Action frame. Return 0 on success, non-zero on failure.
728 */
729 int
ieee80211_parse_action(struct ieee80211_node * ni,struct mbuf * m)730 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m)
731 {
732 struct ieee80211vap *vap = ni->ni_vap;
733 const struct ieee80211_action *ia;
734 struct ieee80211_frame *wh;
735 uint8_t *frm, *efrm;
736
737 /*
738 * action frame format:
739 * [1] category
740 * [1] action
741 * [tlv] parameters
742 */
743 wh = mtod(m, struct ieee80211_frame *);
744 frm = (u_int8_t *)&wh[1];
745 efrm = mtod(m, u_int8_t *) + m->m_len;
746 IEEE80211_VERIFY_LENGTH(efrm - frm,
747 sizeof(struct ieee80211_action), return EINVAL);
748 ia = (const struct ieee80211_action *) frm;
749
750 vap->iv_stats.is_rx_action++;
751 IEEE80211_NODE_STAT(ni, rx_action);
752
753 /* verify frame payloads but defer processing */
754 switch (ia->ia_category) {
755 case IEEE80211_ACTION_CAT_BA:
756 switch (ia->ia_action) {
757 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
758 IEEE80211_VERIFY_LENGTH(efrm - frm,
759 sizeof(struct ieee80211_action_ba_addbarequest),
760 return EINVAL);
761 break;
762 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
763 IEEE80211_VERIFY_LENGTH(efrm - frm,
764 sizeof(struct ieee80211_action_ba_addbaresponse),
765 return EINVAL);
766 break;
767 case IEEE80211_ACTION_BA_DELBA:
768 IEEE80211_VERIFY_LENGTH(efrm - frm,
769 sizeof(struct ieee80211_action_ba_delba),
770 return EINVAL);
771 break;
772 }
773 break;
774 case IEEE80211_ACTION_CAT_HT:
775 switch (ia->ia_action) {
776 case IEEE80211_ACTION_HT_TXCHWIDTH:
777 IEEE80211_VERIFY_LENGTH(efrm - frm,
778 sizeof(struct ieee80211_action_ht_txchwidth),
779 return EINVAL);
780 break;
781 case IEEE80211_ACTION_HT_MIMOPWRSAVE:
782 IEEE80211_VERIFY_LENGTH(efrm - frm,
783 sizeof(struct ieee80211_action_ht_mimopowersave),
784 return EINVAL);
785 break;
786 }
787 break;
788 #ifdef IEEE80211_SUPPORT_MESH
789 case IEEE80211_ACTION_CAT_MESH:
790 switch (ia->ia_action) {
791 case IEEE80211_ACTION_MESH_LMETRIC:
792 /*
793 * XXX: verification is true only if we are using
794 * Airtime link metric (default)
795 */
796 IEEE80211_VERIFY_LENGTH(efrm - frm,
797 sizeof(struct ieee80211_meshlmetric_ie),
798 return EINVAL);
799 break;
800 case IEEE80211_ACTION_MESH_HWMP:
801 /* verify something */
802 break;
803 case IEEE80211_ACTION_MESH_GANN:
804 IEEE80211_VERIFY_LENGTH(efrm - frm,
805 sizeof(struct ieee80211_meshgann_ie),
806 return EINVAL);
807 break;
808 case IEEE80211_ACTION_MESH_CC:
809 case IEEE80211_ACTION_MESH_MCCA_SREQ:
810 case IEEE80211_ACTION_MESH_MCCA_SREP:
811 case IEEE80211_ACTION_MESH_MCCA_AREQ:
812 case IEEE80211_ACTION_MESH_MCCA_ADVER:
813 case IEEE80211_ACTION_MESH_MCCA_TRDOWN:
814 case IEEE80211_ACTION_MESH_TBTT_REQ:
815 case IEEE80211_ACTION_MESH_TBTT_RES:
816 /* reject these early on, not implemented */
817 IEEE80211_DISCARD(vap,
818 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
819 wh, NULL, "not implemented yet, act=0x%02X",
820 ia->ia_action);
821 return EINVAL;
822 }
823 break;
824 case IEEE80211_ACTION_CAT_SELF_PROT:
825 /* If TA or RA group address discard silently */
826 if (IEEE80211_IS_MULTICAST(wh->i_addr1) ||
827 IEEE80211_IS_MULTICAST(wh->i_addr2))
828 return EINVAL;
829 /*
830 * XXX: Should we verify complete length now or it is
831 * to varying in sizes?
832 */
833 switch (ia->ia_action) {
834 case IEEE80211_ACTION_MESHPEERING_CONFIRM:
835 case IEEE80211_ACTION_MESHPEERING_CLOSE:
836 /* is not a peering candidate (yet) */
837 if (ni == vap->iv_bss)
838 return EINVAL;
839 break;
840 }
841 break;
842 #endif
843 }
844 return 0;
845 }
846
847 #ifdef IEEE80211_DEBUG
848 /*
849 * Debugging support.
850 */
851 void
ieee80211_ssid_mismatch(struct ieee80211vap * vap,const char * tag,uint8_t mac[IEEE80211_ADDR_LEN],uint8_t * ssid)852 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag,
853 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid)
854 {
855 printf("[%s] discard %s frame, ssid mismatch: ",
856 ether_sprintf(mac), tag);
857 ieee80211_print_essid(ssid + 2, ssid[1]);
858 printf("\n");
859 }
860
861 /*
862 * Return the bssid of a frame.
863 */
864 static const uint8_t *
ieee80211_getbssid(const struct ieee80211vap * vap,const struct ieee80211_frame * wh)865 ieee80211_getbssid(const struct ieee80211vap *vap,
866 const struct ieee80211_frame *wh)
867 {
868 if (vap->iv_opmode == IEEE80211_M_STA)
869 return wh->i_addr2;
870 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS)
871 return wh->i_addr1;
872 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL)
873 return wh->i_addr1;
874 return wh->i_addr3;
875 }
876
877 #include <machine/stdarg.h>
878
879 void
ieee80211_note(const struct ieee80211vap * vap,const char * fmt,...)880 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...)
881 {
882 char buf[128]; /* XXX */
883 va_list ap;
884
885 va_start(ap, fmt);
886 vsnprintf(buf, sizeof(buf), fmt, ap);
887 va_end(ap);
888
889 if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */
890 }
891
892 void
ieee80211_note_frame(const struct ieee80211vap * vap,const struct ieee80211_frame * wh,const char * fmt,...)893 ieee80211_note_frame(const struct ieee80211vap *vap,
894 const struct ieee80211_frame *wh,
895 const char *fmt, ...)
896 {
897 char buf[128]; /* XXX */
898 va_list ap;
899
900 va_start(ap, fmt);
901 vsnprintf(buf, sizeof(buf), fmt, ap);
902 va_end(ap);
903 if_printf(vap->iv_ifp, "[%s] %s\n",
904 ether_sprintf(ieee80211_getbssid(vap, wh)), buf);
905 }
906
907 void
ieee80211_note_mac(const struct ieee80211vap * vap,const uint8_t mac[IEEE80211_ADDR_LEN],const char * fmt,...)908 ieee80211_note_mac(const struct ieee80211vap *vap,
909 const uint8_t mac[IEEE80211_ADDR_LEN],
910 const char *fmt, ...)
911 {
912 char buf[128]; /* XXX */
913 va_list ap;
914
915 va_start(ap, fmt);
916 vsnprintf(buf, sizeof(buf), fmt, ap);
917 va_end(ap);
918 if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf);
919 }
920
921 void
ieee80211_discard_frame(const struct ieee80211vap * vap,const struct ieee80211_frame * wh,const char * type,const char * fmt,...)922 ieee80211_discard_frame(const struct ieee80211vap *vap,
923 const struct ieee80211_frame *wh,
924 const char *type, const char *fmt, ...)
925 {
926 va_list ap;
927
928 if_printf(vap->iv_ifp, "[%s] discard ",
929 ether_sprintf(ieee80211_getbssid(vap, wh)));
930 if (type == NULL) {
931 printf("%s frame, ", ieee80211_mgt_subtype_name[
932 (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) >>
933 IEEE80211_FC0_SUBTYPE_SHIFT]);
934 } else
935 printf("%s frame, ", type);
936 va_start(ap, fmt);
937 vprintf(fmt, ap);
938 va_end(ap);
939 printf("\n");
940 }
941
942 void
ieee80211_discard_ie(const struct ieee80211vap * vap,const struct ieee80211_frame * wh,const char * type,const char * fmt,...)943 ieee80211_discard_ie(const struct ieee80211vap *vap,
944 const struct ieee80211_frame *wh,
945 const char *type, const char *fmt, ...)
946 {
947 va_list ap;
948
949 if_printf(vap->iv_ifp, "[%s] discard ",
950 ether_sprintf(ieee80211_getbssid(vap, wh)));
951 if (type != NULL)
952 printf("%s information element, ", type);
953 else
954 printf("information element, ");
955 va_start(ap, fmt);
956 vprintf(fmt, ap);
957 va_end(ap);
958 printf("\n");
959 }
960
961 void
ieee80211_discard_mac(const struct ieee80211vap * vap,const uint8_t mac[IEEE80211_ADDR_LEN],const char * type,const char * fmt,...)962 ieee80211_discard_mac(const struct ieee80211vap *vap,
963 const uint8_t mac[IEEE80211_ADDR_LEN],
964 const char *type, const char *fmt, ...)
965 {
966 va_list ap;
967
968 if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac));
969 if (type != NULL)
970 printf("%s frame, ", type);
971 else
972 printf("frame, ");
973 va_start(ap, fmt);
974 vprintf(fmt, ap);
975 va_end(ap);
976 printf("\n");
977 }
978 #endif /* IEEE80211_DEBUG */
979