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>
66 #include <net80211/ieee80211_sta.h>
68 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2)
70 static void adhoc_vattach(struct ieee80211vap *);
71 static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int);
72 static int adhoc_input(struct ieee80211_node *, struct mbuf *, int, int);
73 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *,
74 int subtype, int, int);
75 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *,
76 int subtype, int, int);
77 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
80 ieee80211_adhoc_attach(struct ieee80211com *ic)
82 ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach;
83 ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach;
87 ieee80211_adhoc_detach(struct ieee80211com *ic)
92 adhoc_vdetach(struct ieee80211vap *vap)
97 adhoc_vattach(struct ieee80211vap *vap)
99 vap->iv_newstate = adhoc_newstate;
100 vap->iv_input = adhoc_input;
101 if (vap->iv_opmode == IEEE80211_M_IBSS)
102 vap->iv_recv_mgmt = adhoc_recv_mgmt;
104 vap->iv_recv_mgmt = ahdemo_recv_mgmt;
105 vap->iv_recv_ctl = adhoc_recv_ctl;
106 vap->iv_opdetach = adhoc_vdetach;
107 #ifdef IEEE80211_SUPPORT_TDMA
109 * Throw control to tdma support. Note we do this
110 * after setting up our callbacks so it can piggyback
113 if (vap->iv_caps & IEEE80211_C_TDMA)
114 ieee80211_tdma_vattach(vap);
119 sta_leave(void *arg, struct ieee80211_node *ni)
121 struct ieee80211vap *vap = arg;
123 if (ni->ni_vap == vap && ni != vap->iv_bss)
124 ieee80211_node_leave(ni);
128 * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler.
131 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
133 struct ieee80211com *ic = vap->iv_ic;
134 struct ieee80211_node *ni;
135 enum ieee80211_state ostate;
137 IEEE80211_LOCK_ASSERT(vap->iv_ic);
139 ostate = vap->iv_state;
140 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
141 __func__, ieee80211_state_name[ostate],
142 ieee80211_state_name[nstate], arg);
143 vap->iv_state = nstate; /* state transition */
144 if (ostate != IEEE80211_S_SCAN)
145 ieee80211_cancel_scan(vap); /* background scan */
146 ni = vap->iv_bss; /* NB: no reference held */
148 case IEEE80211_S_INIT:
150 case IEEE80211_S_SCAN:
151 ieee80211_cancel_scan(vap);
156 if (ostate != IEEE80211_S_INIT) {
157 /* NB: optimize INIT -> INIT case */
158 ieee80211_reset_bss(vap);
161 case IEEE80211_S_SCAN:
163 case IEEE80211_S_RUN: /* beacon miss */
164 /* purge station table; entries are stale */
165 ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap);
167 case IEEE80211_S_INIT:
168 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
169 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
171 * Already have a channel; bypass the
172 * scan and startup immediately.
174 ieee80211_create_ibss(vap,
175 ieee80211_ht_adjust_channel(ic,
176 vap->iv_des_chan, vap->iv_flags_ht));
180 * Initiate a scan. We can come here as a result
181 * of an IEEE80211_IOC_SCAN_REQ too in which case
182 * the vap will be marked with IEEE80211_FEXT_SCANREQ
183 * and the scan request parameters will be present
184 * in iv_scanreq. Otherwise we do the default.
186 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
187 ieee80211_check_scan(vap,
188 vap->iv_scanreq_flags,
189 vap->iv_scanreq_duration,
190 vap->iv_scanreq_mindwell,
191 vap->iv_scanreq_maxdwell,
192 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
193 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
195 ieee80211_check_scan_current(vap);
197 case IEEE80211_S_SCAN:
199 * This can happen because of a change in state
200 * that requires a reset. Trigger a new scan
201 * unless we're in manual roaming mode in which
202 * case an application must issue an explicit request.
204 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
205 ieee80211_check_scan_current(vap);
211 case IEEE80211_S_RUN:
212 if (vap->iv_flags & IEEE80211_F_WPA) {
213 /* XXX validate prerequisites */
216 case IEEE80211_S_SCAN:
217 #ifdef IEEE80211_DEBUG
218 if (ieee80211_msg_debug(vap)) {
220 "synchronized with %s ssid ",
221 ether_sprintf(ni->ni_bssid));
222 ieee80211_print_essid(vap->iv_bss->ni_essid,
225 printf(" channel %d start %uMb\n",
226 ieee80211_chan2ieee(ic, ic->ic_curchan),
227 IEEE80211_RATE2MBS(ni->ni_txrate));
235 * When 802.1x is not in use mark the port authorized
236 * at this point so traffic can flow.
238 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
239 ieee80211_node_authorize(ni);
241 * Fake association when joining an existing bss.
243 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) &&
244 ic->ic_newassoc != NULL)
245 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN);
247 case IEEE80211_S_SLEEP:
248 vap->iv_sta_ps(vap, 0);
252 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
253 "%s: unexpected state transition %s -> %s\n", __func__,
254 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
261 * Decide if a received management frame should be
262 * printed when debugging is enabled. This filters some
263 * of the less interesting frames that come frequently
267 doprint(struct ieee80211vap *vap, int subtype)
270 case IEEE80211_FC0_SUBTYPE_BEACON:
271 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
272 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
279 * Process a received frame. The node associated with the sender
280 * should be supplied. If nothing was found in the node table then
281 * the caller is assumed to supply a reference to iv_bss instead.
282 * The RSSI and a timestamp are also supplied. The RSSI data is used
283 * during AP scanning to select a AP to associate with; it can have
284 * any units so long as values have consistent units and higher values
285 * mean ``better signal''. The receive timestamp is currently not used
286 * by the 802.11 layer.
289 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
291 #define HAS_SEQ(type) ((type & 0x4) == 0)
292 struct ieee80211vap *vap = ni->ni_vap;
293 struct ieee80211com *ic = ni->ni_ic;
294 struct ifnet *ifp = vap->iv_ifp;
295 struct ieee80211_frame *wh;
296 struct ieee80211_key *key;
297 struct ether_header *eh;
298 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
299 uint8_t dir, type, subtype, qos;
303 if (m->m_flags & M_AMPDU_MPDU) {
305 * Fastpath for A-MPDU reorder q resubmission. Frames
306 * w/ M_AMPDU_MPDU marked have already passed through
307 * here but were received out of order and been held on
308 * the reorder queue. When resubmitted they are marked
309 * with the M_AMPDU_MPDU flag and we can bypass most of
310 * the normal processing.
312 wh = mtod(m, struct ieee80211_frame *);
313 type = IEEE80211_FC0_TYPE_DATA;
314 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
315 subtype = IEEE80211_FC0_SUBTYPE_QOS;
316 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
320 KASSERT(ni != NULL, ("null node"));
321 ni->ni_inact = ni->ni_inact_reload;
323 type = -1; /* undefined */
325 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
326 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
327 ni->ni_macaddr, NULL,
328 "too short (1): len %u", m->m_pkthdr.len);
329 vap->iv_stats.is_rx_tooshort++;
333 * Bit of a cheat here, we use a pointer for a 3-address
334 * frame format but don't reference fields past outside
335 * ieee80211_frame_min w/o first validating the data is
338 wh = mtod(m, struct ieee80211_frame *);
340 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
341 IEEE80211_FC0_VERSION_0) {
342 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
343 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
344 wh->i_fc[0], wh->i_fc[1]);
345 vap->iv_stats.is_rx_badversion++;
349 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
350 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
351 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
352 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
353 if (dir != IEEE80211_FC1_DIR_NODS)
355 else if (type == IEEE80211_FC0_TYPE_CTL)
358 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
359 IEEE80211_DISCARD_MAC(vap,
360 IEEE80211_MSG_ANY, ni->ni_macaddr,
361 NULL, "too short (2): len %u",
363 vap->iv_stats.is_rx_tooshort++;
369 * Validate the bssid.
371 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
372 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
373 /* not interested in */
374 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
375 bssid, NULL, "%s", "not to bss");
376 vap->iv_stats.is_rx_wrongbss++;
380 * Data frame, cons up a node when it doesn't
381 * exist. This should probably done after an ACL check.
383 if (type == IEEE80211_FC0_TYPE_DATA &&
385 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
387 * Beware of frames that come in too early; we
388 * can receive broadcast frames and creating sta
389 * entries will blow up because there is no bss
392 if (vap->iv_state != IEEE80211_S_RUN) {
393 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
394 wh, "data", "not in RUN state (%s)",
395 ieee80211_state_name[vap->iv_state]);
396 vap->iv_stats.is_rx_badstate++;
400 * Fake up a node for this newly
401 * discovered member of the IBSS.
403 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2);
405 /* NB: stat kept for alloc failure */
409 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
412 uint8_t tid = ieee80211_gettid(wh);
413 if (IEEE80211_QOS_HAS_SEQ(wh) &&
414 TID_TO_WME_AC(tid) >= WME_AC_VI)
415 ic->ic_wme.wme_hipri_traffic++;
416 rxseq = le16toh(*(uint16_t *)wh->i_seq);
417 if (! ieee80211_check_rxseq(ni, wh)) {
418 /* duplicate, discard */
419 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
421 "seqno <%u,%u> fragno <%u,%u> tid %u",
422 rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
423 ni->ni_rxseqs[tid] >>
424 IEEE80211_SEQ_SEQ_SHIFT,
425 rxseq & IEEE80211_SEQ_FRAG_MASK,
427 IEEE80211_SEQ_FRAG_MASK,
429 vap->iv_stats.is_rx_dup++;
430 IEEE80211_NODE_STAT(ni, rx_dup);
433 ni->ni_rxseqs[tid] = rxseq;
438 case IEEE80211_FC0_TYPE_DATA:
439 hdrspace = ieee80211_hdrspace(ic, wh);
440 if (m->m_len < hdrspace &&
441 (m = m_pullup(m, hdrspace)) == NULL) {
442 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
443 ni->ni_macaddr, NULL,
444 "data too short: expecting %u", hdrspace);
445 vap->iv_stats.is_rx_tooshort++;
448 if (dir != IEEE80211_FC1_DIR_NODS) {
449 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
450 wh, "data", "incorrect dir 0x%x", dir);
451 vap->iv_stats.is_rx_wrongdir++;
454 /* XXX no power-save support */
457 * Handle A-MPDU re-ordering. If the frame is to be
458 * processed directly then ieee80211_ampdu_reorder
459 * will return 0; otherwise it has consumed the mbuf
460 * and we should do nothing more with it.
462 if ((m->m_flags & M_AMPDU) &&
463 ieee80211_ampdu_reorder(ni, m) != 0) {
470 * Handle privacy requirements. Note that we
471 * must not be preempted from here until after
472 * we (potentially) call ieee80211_crypto_demic;
473 * otherwise we may violate assumptions in the
474 * crypto cipher modules used to do delayed update
475 * of replay sequence numbers.
477 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
478 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
480 * Discard encrypted frames when privacy is off.
482 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
483 wh, "WEP", "%s", "PRIVACY off");
484 vap->iv_stats.is_rx_noprivacy++;
485 IEEE80211_NODE_STAT(ni, rx_noprivacy);
488 key = ieee80211_crypto_decap(ni, m, hdrspace);
490 /* NB: stats+msgs handled in crypto_decap */
491 IEEE80211_NODE_STAT(ni, rx_wepfail);
494 wh = mtod(m, struct ieee80211_frame *);
495 wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
497 /* XXX M_WEP and IEEE80211_F_PRIVACY */
502 * Save QoS bits for use below--before we strip the header.
504 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
505 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
506 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
507 ((struct ieee80211_qosframe *)wh)->i_qos[0];
512 * Next up, any fragmentation.
514 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
515 m = ieee80211_defrag(ni, m, hdrspace);
517 /* Fragment dropped or frame not complete yet */
521 wh = NULL; /* no longer valid, catch any uses */
524 * Next strip any MSDU crypto bits.
526 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
527 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
528 ni->ni_macaddr, "data", "%s", "demic error");
529 vap->iv_stats.is_rx_demicfail++;
530 IEEE80211_NODE_STAT(ni, rx_demicfail);
534 /* copy to listener after decrypt */
535 if (ieee80211_radiotap_active_vap(vap))
536 ieee80211_radiotap_rx(vap, m);
540 * Finally, strip the 802.11 header.
542 m = ieee80211_decap(vap, m, hdrspace);
544 /* XXX mask bit to check for both */
545 /* don't count Null data frames as errors */
546 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
547 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
549 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
550 ni->ni_macaddr, "data", "%s", "decap error");
551 vap->iv_stats.is_rx_decap++;
552 IEEE80211_NODE_STAT(ni, rx_decap);
555 eh = mtod(m, struct ether_header *);
556 if (!ieee80211_node_is_authorized(ni)) {
558 * Deny any non-PAE frames received prior to
559 * authorization. For open/shared-key
560 * authentication the port is mark authorized
561 * after authentication completes. For 802.1x
562 * the port is not marked authorized by the
563 * authenticator until the handshake has completed.
565 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
566 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
567 eh->ether_shost, "data",
568 "unauthorized port: ether type 0x%x len %u",
569 eh->ether_type, m->m_pkthdr.len);
570 vap->iv_stats.is_rx_unauth++;
571 IEEE80211_NODE_STAT(ni, rx_unauth);
576 * When denying unencrypted frames, discard
577 * any non-PAE frames received without encryption.
579 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
580 (key == NULL && (m->m_flags & M_WEP) == 0) &&
581 eh->ether_type != htons(ETHERTYPE_PAE)) {
583 * Drop unencrypted frames.
585 vap->iv_stats.is_rx_unencrypted++;
586 IEEE80211_NODE_STAT(ni, rx_unencrypted);
590 /* XXX require HT? */
591 if (qos & IEEE80211_QOS_AMSDU) {
592 m = ieee80211_decap_amsdu(ni, m);
594 return IEEE80211_FC0_TYPE_DATA;
596 #ifdef IEEE80211_SUPPORT_SUPERG
597 m = ieee80211_decap_fastframe(vap, ni, m);
599 return IEEE80211_FC0_TYPE_DATA;
602 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
603 ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
605 ieee80211_deliver_data(vap, ni, m);
606 return IEEE80211_FC0_TYPE_DATA;
608 case IEEE80211_FC0_TYPE_MGT:
609 vap->iv_stats.is_rx_mgmt++;
610 IEEE80211_NODE_STAT(ni, rx_mgmt);
611 if (dir != IEEE80211_FC1_DIR_NODS) {
612 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
613 wh, "data", "incorrect dir 0x%x", dir);
614 vap->iv_stats.is_rx_wrongdir++;
617 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
618 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
619 ni->ni_macaddr, "mgt", "too short: len %u",
621 vap->iv_stats.is_rx_tooshort++;
624 #ifdef IEEE80211_DEBUG
625 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
626 ieee80211_msg_dumppkts(vap)) {
627 if_printf(ifp, "received %s from %s rssi %d\n",
628 ieee80211_mgt_subtype_name[subtype >>
629 IEEE80211_FC0_SUBTYPE_SHIFT],
630 ether_sprintf(wh->i_addr2), rssi);
633 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
634 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
635 wh, NULL, "%s", "WEP set but not permitted");
636 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
639 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
642 case IEEE80211_FC0_TYPE_CTL:
643 vap->iv_stats.is_rx_ctl++;
644 IEEE80211_NODE_STAT(ni, rx_ctrl);
645 vap->iv_recv_ctl(ni, m, subtype);
649 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
650 wh, "bad", "frame type 0x%x", type);
651 /* should not come here */
658 if (need_tap && ieee80211_radiotap_active_vap(vap))
659 ieee80211_radiotap_rx(vap, m);
666 is11bclient(const uint8_t *rates, const uint8_t *xrates)
668 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
671 /* NB: the 11b clients we care about will not have xrates */
672 if (xrates != NULL || rates == NULL)
674 for (i = 0; i < rates[1]; i++) {
675 int r = rates[2+i] & IEEE80211_RATE_VAL;
676 if (r > 2*11 || ((1<<r) & brates) == 0)
683 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
684 int subtype, int rssi, int nf)
686 struct ieee80211vap *vap = ni->ni_vap;
687 struct ieee80211com *ic = ni->ni_ic;
688 struct ieee80211_frame *wh;
689 uint8_t *frm, *efrm, *sfrm;
690 uint8_t *ssid, *rates, *xrates;
692 int ht_state_change = 0;
695 wh = mtod(m0, struct ieee80211_frame *);
696 frm = (uint8_t *)&wh[1];
697 efrm = mtod(m0, uint8_t *) + m0->m_len;
699 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
700 case IEEE80211_FC0_SUBTYPE_BEACON: {
701 struct ieee80211_scanparams scan;
703 * We process beacon/probe response
704 * frames to discover neighbors.
706 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
709 * Count frame now that we know it's to be processed.
711 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
712 vap->iv_stats.is_rx_beacon++; /* XXX remove */
713 IEEE80211_NODE_STAT(ni, rx_beacons);
715 IEEE80211_NODE_STAT(ni, rx_proberesp);
717 * If scanning, just pass information to the scan module.
719 if (ic->ic_flags & IEEE80211_F_SCAN) {
720 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
722 * Actively scanning a channel marked passive;
723 * send a probe request now that we know there
724 * is 802.11 traffic present.
726 * XXX check if the beacon we recv'd gives
727 * us what we need and suppress the probe req
729 ieee80211_probe_curchan(vap, 1);
730 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
732 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
735 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
736 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
738 * Create a new entry in the neighbor table.
740 ni = ieee80211_add_neighbor(vap, wh, &scan);
741 } else if (ni->ni_capinfo == 0) {
743 * Update faked node created on transmit.
744 * Note this also updates the tsf.
746 ieee80211_init_neighbor(ni, wh, &scan);
749 * Record tsf for potential resync.
751 memcpy(ni->ni_tstamp.data, scan.tstamp,
752 sizeof(ni->ni_tstamp));
755 * This isn't enabled yet - otherwise it would
756 * update the HT parameters and channel width
757 * from any node, which could lead to lots of
758 * strange behaviour if the 11n nodes aren't
759 * exactly configured to match.
762 if (scan.htcap != NULL && scan.htinfo != NULL &&
763 (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
764 if (ieee80211_ht_updateparams(ni,
765 scan.htcap, scan.htinfo))
770 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
774 * Same here - the channel width change should
775 * be applied to the specific peer node, not
776 * to the ic. Ie, the interface configuration
777 * should stay in its current channel width;
778 * but it should change the rate control and
779 * any queued frames for the given node only.
781 * Since there's no (current) way to inform
782 * the driver that a channel width change has
783 * occured for a single node, just stub this
788 ieee80211_update_chw(ic);
794 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
795 if (vap->iv_state != IEEE80211_S_RUN) {
796 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
797 wh, NULL, "wrong state %s",
798 ieee80211_state_name[vap->iv_state]);
799 vap->iv_stats.is_rx_mgtdiscard++;
802 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
803 /* frame must be directed */
804 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
805 wh, NULL, "%s", "not unicast");
806 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */
813 * [tlv] supported rates
814 * [tlv] extended supported rates
816 ssid = rates = xrates = NULL;
818 while (efrm - frm > 1) {
819 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
821 case IEEE80211_ELEMID_SSID:
824 case IEEE80211_ELEMID_RATES:
827 case IEEE80211_ELEMID_XRATES:
833 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
835 IEEE80211_VERIFY_ELEMENT(xrates,
836 IEEE80211_RATE_MAXSIZE - rates[1], return);
837 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
838 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
839 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
840 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
842 "%s", "no ssid with ssid suppression enabled");
843 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
847 /* XXX find a better class or define it's own */
848 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
849 "%s", "recv probe req");
851 * Some legacy 11b clients cannot hack a complete
852 * probe response frame. When the request includes
853 * only a bare-bones rate set, communicate this to
856 ieee80211_send_proberesp(vap, wh->i_addr2,
857 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
860 case IEEE80211_FC0_SUBTYPE_ACTION:
861 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
862 if (ni == vap->iv_bss) {
863 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
864 wh, NULL, "%s", "unknown node");
865 vap->iv_stats.is_rx_mgtdiscard++;
866 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
867 !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
868 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
869 wh, NULL, "%s", "not for us");
870 vap->iv_stats.is_rx_mgtdiscard++;
871 } else if (vap->iv_state != IEEE80211_S_RUN) {
872 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
873 wh, NULL, "wrong state %s",
874 ieee80211_state_name[vap->iv_state]);
875 vap->iv_stats.is_rx_mgtdiscard++;
877 if (ieee80211_parse_action(ni, m0) == 0)
878 (void)ic->ic_recv_action(ni, wh, frm, efrm);
882 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
883 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
884 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
885 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
886 case IEEE80211_FC0_SUBTYPE_ATIM:
887 case IEEE80211_FC0_SUBTYPE_DISASSOC:
888 case IEEE80211_FC0_SUBTYPE_AUTH:
889 case IEEE80211_FC0_SUBTYPE_DEAUTH:
890 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
891 wh, NULL, "%s", "not handled");
892 vap->iv_stats.is_rx_mgtdiscard++;
896 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
897 wh, "mgt", "subtype 0x%x not handled", subtype);
898 vap->iv_stats.is_rx_badsubtype++;
902 #undef IEEE80211_VERIFY_LENGTH
903 #undef IEEE80211_VERIFY_ELEMENT
906 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
907 int subtype, int rssi, int nf)
909 struct ieee80211vap *vap = ni->ni_vap;
910 struct ieee80211com *ic = ni->ni_ic;
911 struct ieee80211_frame *wh;
914 * Process management frames when scanning; useful for doing
917 if (ic->ic_flags & IEEE80211_F_SCAN)
918 adhoc_recv_mgmt(ni, m0, subtype, rssi, nf);
920 wh = mtod(m0, struct ieee80211_frame *);
922 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
923 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
924 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
925 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
926 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
927 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
928 case IEEE80211_FC0_SUBTYPE_BEACON:
929 case IEEE80211_FC0_SUBTYPE_ATIM:
930 case IEEE80211_FC0_SUBTYPE_DISASSOC:
931 case IEEE80211_FC0_SUBTYPE_AUTH:
932 case IEEE80211_FC0_SUBTYPE_DEAUTH:
933 case IEEE80211_FC0_SUBTYPE_ACTION:
934 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
935 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
936 wh, NULL, "%s", "not handled");
937 vap->iv_stats.is_rx_mgtdiscard++;
940 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
941 wh, "mgt", "subtype 0x%x not handled", subtype);
942 vap->iv_stats.is_rx_badsubtype++;
949 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
953 case IEEE80211_FC0_SUBTYPE_BAR:
954 ieee80211_recv_bar(ni, m);