2 * Copyright (c) 2007-2009 Sam Leffler, Errno Consulting
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
32 * IEEE 802.11 IBSS mode support.
37 #include <sys/param.h>
38 #include <sys/systm.h>
40 #include <sys/malloc.h>
41 #include <sys/kernel.h>
43 #include <sys/socket.h>
44 #include <sys/sockio.h>
45 #include <sys/endian.h>
46 #include <sys/errno.h>
48 #include <sys/sysctl.h>
51 #include <net/if_media.h>
52 #include <net/if_llc.h>
53 #include <net/ethernet.h>
57 #include <net80211/ieee80211_var.h>
58 #include <net80211/ieee80211_adhoc.h>
59 #include <net80211/ieee80211_input.h>
60 #ifdef IEEE80211_SUPPORT_SUPERG
61 #include <net80211/ieee80211_superg.h>
63 #ifdef IEEE80211_SUPPORT_TDMA
64 #include <net80211/ieee80211_tdma.h>
67 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2)
69 static void adhoc_vattach(struct ieee80211vap *);
70 static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int);
71 static int adhoc_input(struct ieee80211_node *, struct mbuf *, int, int);
72 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *,
73 int subtype, int, int);
74 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *,
75 int subtype, int, int);
76 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
79 ieee80211_adhoc_attach(struct ieee80211com *ic)
81 ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach;
82 ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach;
86 ieee80211_adhoc_detach(struct ieee80211com *ic)
91 adhoc_vdetach(struct ieee80211vap *vap)
96 adhoc_vattach(struct ieee80211vap *vap)
98 vap->iv_newstate = adhoc_newstate;
99 vap->iv_input = adhoc_input;
100 if (vap->iv_opmode == IEEE80211_M_IBSS)
101 vap->iv_recv_mgmt = adhoc_recv_mgmt;
103 vap->iv_recv_mgmt = ahdemo_recv_mgmt;
104 vap->iv_recv_ctl = adhoc_recv_ctl;
105 vap->iv_opdetach = adhoc_vdetach;
106 #ifdef IEEE80211_SUPPORT_TDMA
108 * Throw control to tdma support. Note we do this
109 * after setting up our callbacks so it can piggyback
112 if (vap->iv_caps & IEEE80211_C_TDMA)
113 ieee80211_tdma_vattach(vap);
118 sta_leave(void *arg, struct ieee80211_node *ni)
120 struct ieee80211vap *vap = arg;
122 if (ni->ni_vap == vap && ni != vap->iv_bss)
123 ieee80211_node_leave(ni);
127 * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler.
130 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
132 struct ieee80211com *ic = vap->iv_ic;
133 struct ieee80211_node *ni;
134 enum ieee80211_state ostate;
136 IEEE80211_LOCK_ASSERT(vap->iv_ic);
138 ostate = vap->iv_state;
139 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
140 __func__, ieee80211_state_name[ostate],
141 ieee80211_state_name[nstate], arg);
142 vap->iv_state = nstate; /* state transition */
143 if (ostate != IEEE80211_S_SCAN)
144 ieee80211_cancel_scan(vap); /* background scan */
145 ni = vap->iv_bss; /* NB: no reference held */
147 case IEEE80211_S_INIT:
149 case IEEE80211_S_SCAN:
150 ieee80211_cancel_scan(vap);
155 if (ostate != IEEE80211_S_INIT) {
156 /* NB: optimize INIT -> INIT case */
157 ieee80211_reset_bss(vap);
160 case IEEE80211_S_SCAN:
162 case IEEE80211_S_RUN: /* beacon miss */
163 /* purge station table; entries are stale */
164 ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap);
166 case IEEE80211_S_INIT:
167 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
168 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
170 * Already have a channel; bypass the
171 * scan and startup immediately.
173 ieee80211_create_ibss(vap, vap->iv_des_chan);
177 * Initiate a scan. We can come here as a result
178 * of an IEEE80211_IOC_SCAN_REQ too in which case
179 * the vap will be marked with IEEE80211_FEXT_SCANREQ
180 * and the scan request parameters will be present
181 * in iv_scanreq. Otherwise we do the default.
183 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
184 ieee80211_check_scan(vap,
185 vap->iv_scanreq_flags,
186 vap->iv_scanreq_duration,
187 vap->iv_scanreq_mindwell,
188 vap->iv_scanreq_maxdwell,
189 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
190 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
192 ieee80211_check_scan_current(vap);
194 case IEEE80211_S_SCAN:
196 * This can happen because of a change in state
197 * that requires a reset. Trigger a new scan
198 * unless we're in manual roaming mode in which
199 * case an application must issue an explicit request.
201 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
202 ieee80211_check_scan_current(vap);
208 case IEEE80211_S_RUN:
209 if (vap->iv_flags & IEEE80211_F_WPA) {
210 /* XXX validate prerequisites */
213 case IEEE80211_S_SCAN:
214 #ifdef IEEE80211_DEBUG
215 if (ieee80211_msg_debug(vap)) {
217 "synchronized with %s ssid ",
218 ether_sprintf(ni->ni_bssid));
219 ieee80211_print_essid(vap->iv_bss->ni_essid,
222 printf(" channel %d start %uMb\n",
223 ieee80211_chan2ieee(ic, ic->ic_curchan),
224 IEEE80211_RATE2MBS(ni->ni_txrate));
232 * When 802.1x is not in use mark the port authorized
233 * at this point so traffic can flow.
235 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
236 ieee80211_node_authorize(ni);
238 * Fake association when joining an existing bss.
240 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) &&
241 ic->ic_newassoc != NULL)
242 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN);
244 case IEEE80211_S_SLEEP:
245 ieee80211_sta_pwrsave(vap, 0);
249 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
250 "%s: unexpected state transition %s -> %s\n", __func__,
251 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
258 * Decide if a received management frame should be
259 * printed when debugging is enabled. This filters some
260 * of the less interesting frames that come frequently
264 doprint(struct ieee80211vap *vap, int subtype)
267 case IEEE80211_FC0_SUBTYPE_BEACON:
268 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
269 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
276 * Process a received frame. The node associated with the sender
277 * should be supplied. If nothing was found in the node table then
278 * the caller is assumed to supply a reference to iv_bss instead.
279 * The RSSI and a timestamp are also supplied. The RSSI data is used
280 * during AP scanning to select a AP to associate with; it can have
281 * any units so long as values have consistent units and higher values
282 * mean ``better signal''. The receive timestamp is currently not used
283 * by the 802.11 layer.
286 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
288 #define HAS_SEQ(type) ((type & 0x4) == 0)
289 struct ieee80211vap *vap = ni->ni_vap;
290 struct ieee80211com *ic = ni->ni_ic;
291 struct ifnet *ifp = vap->iv_ifp;
292 struct ieee80211_frame *wh;
293 struct ieee80211_key *key;
294 struct ether_header *eh;
295 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
296 uint8_t dir, type, subtype, qos;
300 if (m->m_flags & M_AMPDU_MPDU) {
302 * Fastpath for A-MPDU reorder q resubmission. Frames
303 * w/ M_AMPDU_MPDU marked have already passed through
304 * here but were received out of order and been held on
305 * the reorder queue. When resubmitted they are marked
306 * with the M_AMPDU_MPDU flag and we can bypass most of
307 * the normal processing.
309 wh = mtod(m, struct ieee80211_frame *);
310 type = IEEE80211_FC0_TYPE_DATA;
311 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
312 subtype = IEEE80211_FC0_SUBTYPE_QOS;
313 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
317 KASSERT(ni != NULL, ("null node"));
318 ni->ni_inact = ni->ni_inact_reload;
320 type = -1; /* undefined */
322 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
323 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
324 ni->ni_macaddr, NULL,
325 "too short (1): len %u", m->m_pkthdr.len);
326 vap->iv_stats.is_rx_tooshort++;
330 * Bit of a cheat here, we use a pointer for a 3-address
331 * frame format but don't reference fields past outside
332 * ieee80211_frame_min w/o first validating the data is
335 wh = mtod(m, struct ieee80211_frame *);
337 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
338 IEEE80211_FC0_VERSION_0) {
339 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
340 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
341 wh->i_fc[0], wh->i_fc[1]);
342 vap->iv_stats.is_rx_badversion++;
346 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
347 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
348 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
349 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
350 if (dir != IEEE80211_FC1_DIR_NODS)
352 else if (type == IEEE80211_FC0_TYPE_CTL)
355 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
356 IEEE80211_DISCARD_MAC(vap,
357 IEEE80211_MSG_ANY, ni->ni_macaddr,
358 NULL, "too short (2): len %u",
360 vap->iv_stats.is_rx_tooshort++;
366 * Validate the bssid.
368 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
369 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
370 /* not interested in */
371 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
372 bssid, NULL, "%s", "not to bss");
373 vap->iv_stats.is_rx_wrongbss++;
377 * Data frame, cons up a node when it doesn't
378 * exist. This should probably done after an ACL check.
380 if (type == IEEE80211_FC0_TYPE_DATA &&
382 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
384 * Beware of frames that come in too early; we
385 * can receive broadcast frames and creating sta
386 * entries will blow up because there is no bss
389 if (vap->iv_state != IEEE80211_S_RUN) {
390 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
391 wh, "data", "not in RUN state (%s)",
392 ieee80211_state_name[vap->iv_state]);
393 vap->iv_stats.is_rx_badstate++;
397 * Fake up a node for this newly
398 * discovered member of the IBSS.
400 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2);
402 /* NB: stat kept for alloc failure */
406 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
409 uint8_t tid = ieee80211_gettid(wh);
410 if (IEEE80211_QOS_HAS_SEQ(wh) &&
411 TID_TO_WME_AC(tid) >= WME_AC_VI)
412 ic->ic_wme.wme_hipri_traffic++;
413 rxseq = le16toh(*(uint16_t *)wh->i_seq);
414 if (! ieee80211_check_rxseq(ni, wh)) {
415 /* duplicate, discard */
416 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
418 "seqno <%u,%u> fragno <%u,%u> tid %u",
419 rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
420 ni->ni_rxseqs[tid] >>
421 IEEE80211_SEQ_SEQ_SHIFT,
422 rxseq & IEEE80211_SEQ_FRAG_MASK,
424 IEEE80211_SEQ_FRAG_MASK,
426 vap->iv_stats.is_rx_dup++;
427 IEEE80211_NODE_STAT(ni, rx_dup);
430 ni->ni_rxseqs[tid] = rxseq;
435 case IEEE80211_FC0_TYPE_DATA:
436 hdrspace = ieee80211_hdrspace(ic, wh);
437 if (m->m_len < hdrspace &&
438 (m = m_pullup(m, hdrspace)) == NULL) {
439 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
440 ni->ni_macaddr, NULL,
441 "data too short: expecting %u", hdrspace);
442 vap->iv_stats.is_rx_tooshort++;
445 if (dir != IEEE80211_FC1_DIR_NODS) {
446 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
447 wh, "data", "incorrect dir 0x%x", dir);
448 vap->iv_stats.is_rx_wrongdir++;
451 /* XXX no power-save support */
454 * Handle A-MPDU re-ordering. If the frame is to be
455 * processed directly then ieee80211_ampdu_reorder
456 * will return 0; otherwise it has consumed the mbuf
457 * and we should do nothing more with it.
459 if ((m->m_flags & M_AMPDU) &&
460 ieee80211_ampdu_reorder(ni, m) != 0) {
467 * Handle privacy requirements. Note that we
468 * must not be preempted from here until after
469 * we (potentially) call ieee80211_crypto_demic;
470 * otherwise we may violate assumptions in the
471 * crypto cipher modules used to do delayed update
472 * of replay sequence numbers.
474 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
475 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
477 * Discard encrypted frames when privacy is off.
479 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
480 wh, "WEP", "%s", "PRIVACY off");
481 vap->iv_stats.is_rx_noprivacy++;
482 IEEE80211_NODE_STAT(ni, rx_noprivacy);
485 key = ieee80211_crypto_decap(ni, m, hdrspace);
487 /* NB: stats+msgs handled in crypto_decap */
488 IEEE80211_NODE_STAT(ni, rx_wepfail);
491 wh = mtod(m, struct ieee80211_frame *);
492 wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
494 /* XXX M_WEP and IEEE80211_F_PRIVACY */
499 * Save QoS bits for use below--before we strip the header.
501 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
502 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
503 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
504 ((struct ieee80211_qosframe *)wh)->i_qos[0];
509 * Next up, any fragmentation.
511 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
512 m = ieee80211_defrag(ni, m, hdrspace);
514 /* Fragment dropped or frame not complete yet */
518 wh = NULL; /* no longer valid, catch any uses */
521 * Next strip any MSDU crypto bits.
523 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
524 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
525 ni->ni_macaddr, "data", "%s", "demic error");
526 vap->iv_stats.is_rx_demicfail++;
527 IEEE80211_NODE_STAT(ni, rx_demicfail);
531 /* copy to listener after decrypt */
532 if (ieee80211_radiotap_active_vap(vap))
533 ieee80211_radiotap_rx(vap, m);
537 * Finally, strip the 802.11 header.
539 m = ieee80211_decap(vap, m, hdrspace);
541 /* XXX mask bit to check for both */
542 /* don't count Null data frames as errors */
543 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
544 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
546 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
547 ni->ni_macaddr, "data", "%s", "decap error");
548 vap->iv_stats.is_rx_decap++;
549 IEEE80211_NODE_STAT(ni, rx_decap);
552 eh = mtod(m, struct ether_header *);
553 if (!ieee80211_node_is_authorized(ni)) {
555 * Deny any non-PAE frames received prior to
556 * authorization. For open/shared-key
557 * authentication the port is mark authorized
558 * after authentication completes. For 802.1x
559 * the port is not marked authorized by the
560 * authenticator until the handshake has completed.
562 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
563 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
564 eh->ether_shost, "data",
565 "unauthorized port: ether type 0x%x len %u",
566 eh->ether_type, m->m_pkthdr.len);
567 vap->iv_stats.is_rx_unauth++;
568 IEEE80211_NODE_STAT(ni, rx_unauth);
573 * When denying unencrypted frames, discard
574 * any non-PAE frames received without encryption.
576 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
577 (key == NULL && (m->m_flags & M_WEP) == 0) &&
578 eh->ether_type != htons(ETHERTYPE_PAE)) {
580 * Drop unencrypted frames.
582 vap->iv_stats.is_rx_unencrypted++;
583 IEEE80211_NODE_STAT(ni, rx_unencrypted);
587 /* XXX require HT? */
588 if (qos & IEEE80211_QOS_AMSDU) {
589 m = ieee80211_decap_amsdu(ni, m);
591 return IEEE80211_FC0_TYPE_DATA;
593 #ifdef IEEE80211_SUPPORT_SUPERG
594 m = ieee80211_decap_fastframe(vap, ni, m);
596 return IEEE80211_FC0_TYPE_DATA;
599 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
600 ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
602 ieee80211_deliver_data(vap, ni, m);
603 return IEEE80211_FC0_TYPE_DATA;
605 case IEEE80211_FC0_TYPE_MGT:
606 vap->iv_stats.is_rx_mgmt++;
607 IEEE80211_NODE_STAT(ni, rx_mgmt);
608 if (dir != IEEE80211_FC1_DIR_NODS) {
609 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
610 wh, "data", "incorrect dir 0x%x", dir);
611 vap->iv_stats.is_rx_wrongdir++;
614 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
615 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
616 ni->ni_macaddr, "mgt", "too short: len %u",
618 vap->iv_stats.is_rx_tooshort++;
621 #ifdef IEEE80211_DEBUG
622 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
623 ieee80211_msg_dumppkts(vap)) {
624 if_printf(ifp, "received %s from %s rssi %d\n",
625 ieee80211_mgt_subtype_name[subtype >>
626 IEEE80211_FC0_SUBTYPE_SHIFT],
627 ether_sprintf(wh->i_addr2), rssi);
630 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
631 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
632 wh, NULL, "%s", "WEP set but not permitted");
633 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
636 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
639 case IEEE80211_FC0_TYPE_CTL:
640 vap->iv_stats.is_rx_ctl++;
641 IEEE80211_NODE_STAT(ni, rx_ctrl);
642 vap->iv_recv_ctl(ni, m, subtype);
646 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
647 wh, "bad", "frame type 0x%x", type);
648 /* should not come here */
655 if (need_tap && ieee80211_radiotap_active_vap(vap))
656 ieee80211_radiotap_rx(vap, m);
663 is11bclient(const uint8_t *rates, const uint8_t *xrates)
665 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
668 /* NB: the 11b clients we care about will not have xrates */
669 if (xrates != NULL || rates == NULL)
671 for (i = 0; i < rates[1]; i++) {
672 int r = rates[2+i] & IEEE80211_RATE_VAL;
673 if (r > 2*11 || ((1<<r) & brates) == 0)
680 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
681 int subtype, int rssi, int nf)
683 struct ieee80211vap *vap = ni->ni_vap;
684 struct ieee80211com *ic = ni->ni_ic;
685 struct ieee80211_frame *wh;
686 uint8_t *frm, *efrm, *sfrm;
687 uint8_t *ssid, *rates, *xrates;
689 wh = mtod(m0, struct ieee80211_frame *);
690 frm = (uint8_t *)&wh[1];
691 efrm = mtod(m0, uint8_t *) + m0->m_len;
693 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
694 case IEEE80211_FC0_SUBTYPE_BEACON: {
695 struct ieee80211_scanparams scan;
697 * We process beacon/probe response
698 * frames to discover neighbors.
700 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
703 * Count frame now that we know it's to be processed.
705 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
706 vap->iv_stats.is_rx_beacon++; /* XXX remove */
707 IEEE80211_NODE_STAT(ni, rx_beacons);
709 IEEE80211_NODE_STAT(ni, rx_proberesp);
711 * If scanning, just pass information to the scan module.
713 if (ic->ic_flags & IEEE80211_F_SCAN) {
714 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
716 * Actively scanning a channel marked passive;
717 * send a probe request now that we know there
718 * is 802.11 traffic present.
720 * XXX check if the beacon we recv'd gives
721 * us what we need and suppress the probe req
723 ieee80211_probe_curchan(vap, 1);
724 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
726 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
729 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
730 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
732 * Create a new entry in the neighbor table.
734 ni = ieee80211_add_neighbor(vap, wh, &scan);
735 } else if (ni->ni_capinfo == 0) {
737 * Update faked node created on transmit.
738 * Note this also updates the tsf.
740 ieee80211_init_neighbor(ni, wh, &scan);
743 * Record tsf for potential resync.
745 memcpy(ni->ni_tstamp.data, scan.tstamp,
746 sizeof(ni->ni_tstamp));
749 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
756 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
757 if (vap->iv_state != IEEE80211_S_RUN) {
758 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
759 wh, NULL, "wrong state %s",
760 ieee80211_state_name[vap->iv_state]);
761 vap->iv_stats.is_rx_mgtdiscard++;
764 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
765 /* frame must be directed */
766 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
767 wh, NULL, "%s", "not unicast");
768 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */
775 * [tlv] supported rates
776 * [tlv] extended supported rates
778 ssid = rates = xrates = NULL;
780 while (efrm - frm > 1) {
781 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
783 case IEEE80211_ELEMID_SSID:
786 case IEEE80211_ELEMID_RATES:
789 case IEEE80211_ELEMID_XRATES:
795 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
797 IEEE80211_VERIFY_ELEMENT(xrates,
798 IEEE80211_RATE_MAXSIZE - rates[1], return);
799 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
800 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
801 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
802 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
804 "%s", "no ssid with ssid suppression enabled");
805 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
809 /* XXX find a better class or define it's own */
810 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
811 "%s", "recv probe req");
813 * Some legacy 11b clients cannot hack a complete
814 * probe response frame. When the request includes
815 * only a bare-bones rate set, communicate this to
818 ieee80211_send_proberesp(vap, wh->i_addr2,
819 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
822 case IEEE80211_FC0_SUBTYPE_ACTION:
823 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
824 if (ni == vap->iv_bss) {
825 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
826 wh, NULL, "%s", "unknown node");
827 vap->iv_stats.is_rx_mgtdiscard++;
828 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
829 !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
830 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
831 wh, NULL, "%s", "not for us");
832 vap->iv_stats.is_rx_mgtdiscard++;
833 } else if (vap->iv_state != IEEE80211_S_RUN) {
834 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
835 wh, NULL, "wrong state %s",
836 ieee80211_state_name[vap->iv_state]);
837 vap->iv_stats.is_rx_mgtdiscard++;
839 if (ieee80211_parse_action(ni, m0) == 0)
840 (void)ic->ic_recv_action(ni, wh, frm, efrm);
844 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
845 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
846 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
847 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
848 case IEEE80211_FC0_SUBTYPE_ATIM:
849 case IEEE80211_FC0_SUBTYPE_DISASSOC:
850 case IEEE80211_FC0_SUBTYPE_AUTH:
851 case IEEE80211_FC0_SUBTYPE_DEAUTH:
852 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
853 wh, NULL, "%s", "not handled");
854 vap->iv_stats.is_rx_mgtdiscard++;
858 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
859 wh, "mgt", "subtype 0x%x not handled", subtype);
860 vap->iv_stats.is_rx_badsubtype++;
864 #undef IEEE80211_VERIFY_LENGTH
865 #undef IEEE80211_VERIFY_ELEMENT
868 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
869 int subtype, int rssi, int nf)
871 struct ieee80211vap *vap = ni->ni_vap;
872 struct ieee80211com *ic = ni->ni_ic;
873 struct ieee80211_frame *wh;
876 * Process management frames when scanning; useful for doing
879 if (ic->ic_flags & IEEE80211_F_SCAN)
880 adhoc_recv_mgmt(ni, m0, subtype, rssi, nf);
882 wh = mtod(m0, struct ieee80211_frame *);
884 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
885 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
886 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
887 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
888 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
889 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
890 case IEEE80211_FC0_SUBTYPE_BEACON:
891 case IEEE80211_FC0_SUBTYPE_ATIM:
892 case IEEE80211_FC0_SUBTYPE_DISASSOC:
893 case IEEE80211_FC0_SUBTYPE_AUTH:
894 case IEEE80211_FC0_SUBTYPE_DEAUTH:
895 case IEEE80211_FC0_SUBTYPE_ACTION:
896 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
897 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
898 wh, NULL, "%s", "not handled");
899 vap->iv_stats.is_rx_mgtdiscard++;
902 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
903 wh, "mgt", "subtype 0x%x not handled", subtype);
904 vap->iv_stats.is_rx_badsubtype++;
911 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
915 case IEEE80211_FC0_SUBTYPE_BAR:
916 ieee80211_recv_bar(ni, m);