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.
25 * $FreeBSD: head/sys/net80211/ieee80211_adhoc.c 203422 2010-02-03 10:07:43Z rpaulo $
29 * IEEE 802.11 IBSS mode support.
34 #include <sys/param.h>
35 #include <sys/systm.h>
37 #include <sys/malloc.h>
38 #include <sys/kernel.h>
40 #include <sys/socket.h>
41 #include <sys/sockio.h>
42 #include <sys/endian.h>
43 #include <sys/errno.h>
45 #include <sys/sysctl.h>
48 #include <net/if_media.h>
49 #include <net/if_llc.h>
50 #include <net/ethernet.h>
51 #include <net/route.h>
55 #include <netproto/802_11/ieee80211_var.h>
56 #include <netproto/802_11/ieee80211_adhoc.h>
57 #include <netproto/802_11/ieee80211_input.h>
58 #ifdef IEEE80211_SUPPORT_SUPERG
59 #include <netproto/802_11/ieee80211_superg.h>
61 #ifdef IEEE80211_SUPPORT_TDMA
62 #include <netproto/802_11/ieee80211_tdma.h>
65 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2)
67 static void adhoc_vattach(struct ieee80211vap *);
68 static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int);
69 static int adhoc_input(struct ieee80211_node *, struct mbuf *, int, int);
70 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *,
71 int subtype, int, int);
72 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *,
73 int subtype, int, int);
74 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
77 ieee80211_adhoc_attach(struct ieee80211com *ic)
79 ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach;
80 ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach;
84 ieee80211_adhoc_detach(struct ieee80211com *ic)
89 adhoc_vdetach(struct ieee80211vap *vap)
94 adhoc_vattach(struct ieee80211vap *vap)
96 vap->iv_newstate = adhoc_newstate;
97 vap->iv_input = adhoc_input;
98 if (vap->iv_opmode == IEEE80211_M_IBSS)
99 vap->iv_recv_mgmt = adhoc_recv_mgmt;
101 vap->iv_recv_mgmt = ahdemo_recv_mgmt;
102 vap->iv_recv_ctl = adhoc_recv_ctl;
103 vap->iv_opdetach = adhoc_vdetach;
104 #ifdef IEEE80211_SUPPORT_TDMA
106 * Throw control to tdma support. Note we do this
107 * after setting up our callbacks so it can piggyback
110 if (vap->iv_caps & IEEE80211_C_TDMA)
111 ieee80211_tdma_vattach(vap);
116 sta_leave(void *arg, struct ieee80211_node *ni)
118 struct ieee80211vap *vap = arg;
120 if (ni->ni_vap == vap && ni != vap->iv_bss)
121 ieee80211_node_leave(ni);
125 * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler.
128 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
130 struct ieee80211com *ic = vap->iv_ic;
131 struct ieee80211_node *ni;
132 enum ieee80211_state ostate;
134 ostate = vap->iv_state;
135 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
136 __func__, ieee80211_state_name[ostate],
137 ieee80211_state_name[nstate], arg);
138 vap->iv_state = nstate; /* state transition */
139 if (ostate != IEEE80211_S_SCAN)
140 ieee80211_cancel_scan(vap); /* background scan */
141 ni = vap->iv_bss; /* NB: no reference held */
143 case IEEE80211_S_INIT:
145 case IEEE80211_S_SCAN:
146 ieee80211_cancel_scan(vap);
151 if (ostate != IEEE80211_S_INIT) {
152 /* NB: optimize INIT -> INIT case */
153 ieee80211_reset_bss(vap);
156 case IEEE80211_S_SCAN:
158 case IEEE80211_S_RUN: /* beacon miss */
159 /* purge station table; entries are stale */
160 ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap);
162 case IEEE80211_S_INIT:
163 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
164 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
166 * Already have a channel; bypass the
167 * scan and startup immediately.
169 ieee80211_create_ibss(vap, vap->iv_des_chan);
173 * Initiate a scan. We can come here as a result
174 * of an IEEE80211_IOC_SCAN_REQ too in which case
175 * the vap will be marked with IEEE80211_FEXT_SCANREQ
176 * and the scan request parameters will be present
177 * in iv_scanreq. Otherwise we do the default.
179 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
180 ieee80211_check_scan(vap,
181 vap->iv_scanreq_flags,
182 vap->iv_scanreq_duration,
183 vap->iv_scanreq_mindwell,
184 vap->iv_scanreq_maxdwell,
185 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
186 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
188 ieee80211_check_scan_current(vap);
190 case IEEE80211_S_SCAN:
192 * This can happen because of a change in state
193 * that requires a reset. Trigger a new scan
194 * unless we're in manual roaming mode in which
195 * case an application must issue an explicit request.
197 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
198 ieee80211_check_scan_current(vap);
204 case IEEE80211_S_RUN:
205 if (vap->iv_flags & IEEE80211_F_WPA) {
206 /* XXX validate prerequisites */
209 case IEEE80211_S_SCAN:
210 #ifdef IEEE80211_DEBUG
211 if (ieee80211_msg_debug(vap)) {
213 "synchronized with %6D ssid ",
215 ieee80211_print_essid(vap->iv_bss->ni_essid,
218 kprintf(" channel %d start %uMb\n",
219 ieee80211_chan2ieee(ic, ic->ic_curchan),
220 IEEE80211_RATE2MBS(ni->ni_txrate));
228 * When 802.1x is not in use mark the port authorized
229 * at this point so traffic can flow.
231 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
232 ieee80211_node_authorize(ni);
234 * Fake association when joining an existing bss.
236 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) &&
237 ic->ic_newassoc != NULL)
238 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN);
240 case IEEE80211_S_SLEEP:
241 ieee80211_sta_pwrsave(vap, 0);
245 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
246 "%s: unexpected state transition %s -> %s\n", __func__,
247 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
254 * Decide if a received management frame should be
255 * printed when debugging is enabled. This filters some
256 * of the less interesting frames that come frequently
260 doprint(struct ieee80211vap *vap, int subtype)
263 case IEEE80211_FC0_SUBTYPE_BEACON:
264 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
265 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
272 * Process a received frame. The node associated with the sender
273 * should be supplied. If nothing was found in the node table then
274 * the caller is assumed to supply a reference to iv_bss instead.
275 * The RSSI and a timestamp are also supplied. The RSSI data is used
276 * during AP scanning to select a AP to associate with; it can have
277 * any units so long as values have consistent units and higher values
278 * mean ``better signal''. The receive timestamp is currently not used
279 * by the 802.11 layer.
282 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
284 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
285 #define HAS_SEQ(type) ((type & 0x4) == 0)
286 struct ieee80211vap *vap = ni->ni_vap;
287 struct ieee80211com *ic = ni->ni_ic;
288 struct ifnet *ifp = vap->iv_ifp;
289 struct ieee80211_frame *wh;
290 struct ieee80211_key *key;
291 struct ether_header *eh;
292 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
293 uint8_t dir, type, subtype, qos;
297 if (m->m_flags & M_AMPDU_MPDU) {
299 * Fastpath for A-MPDU reorder q resubmission. Frames
300 * w/ M_AMPDU_MPDU marked have already passed through
301 * here but were received out of order and been held on
302 * the reorder queue. When resubmitted they are marked
303 * with the M_AMPDU_MPDU flag and we can bypass most of
304 * the normal processing.
306 wh = mtod(m, struct ieee80211_frame *);
307 type = IEEE80211_FC0_TYPE_DATA;
308 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
309 subtype = IEEE80211_FC0_SUBTYPE_QOS;
310 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
314 KASSERT(ni != NULL, ("null node"));
315 ni->ni_inact = ni->ni_inact_reload;
317 type = -1; /* undefined */
319 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
320 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
321 ni->ni_macaddr, NULL,
322 "too short (1): len %u", m->m_pkthdr.len);
323 vap->iv_stats.is_rx_tooshort++;
327 * Bit of a cheat here, we use a pointer for a 3-address
328 * frame format but don't reference fields past outside
329 * ieee80211_frame_min w/o first validating the data is
332 wh = mtod(m, struct ieee80211_frame *);
334 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
335 IEEE80211_FC0_VERSION_0) {
336 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
337 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
338 wh->i_fc[0], wh->i_fc[1]);
339 vap->iv_stats.is_rx_badversion++;
343 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
344 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
345 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
346 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
347 if (dir != IEEE80211_FC1_DIR_NODS)
349 else if (type == IEEE80211_FC0_TYPE_CTL)
352 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
353 IEEE80211_DISCARD_MAC(vap,
354 IEEE80211_MSG_ANY, ni->ni_macaddr,
355 NULL, "too short (2): len %u",
357 vap->iv_stats.is_rx_tooshort++;
363 * Validate the bssid.
365 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
366 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
367 /* not interested in */
368 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
369 bssid, NULL, "%s", "not to bss");
370 vap->iv_stats.is_rx_wrongbss++;
374 * Data frame, cons up a node when it doesn't
375 * exist. This should probably done after an ACL check.
377 if (type == IEEE80211_FC0_TYPE_DATA &&
379 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
381 * Beware of frames that come in too early; we
382 * can receive broadcast frames and creating sta
383 * entries will blow up because there is no bss
386 if (vap->iv_state != IEEE80211_S_RUN) {
387 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
388 wh, "data", "not in RUN state (%s)",
389 ieee80211_state_name[vap->iv_state]);
390 vap->iv_stats.is_rx_badstate++;
394 * Fake up a node for this newly
395 * discovered member of the IBSS.
397 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2);
399 /* NB: stat kept for alloc failure */
403 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
406 uint8_t tid = ieee80211_gettid(wh);
407 if (IEEE80211_QOS_HAS_SEQ(wh) &&
408 TID_TO_WME_AC(tid) >= WME_AC_VI)
409 ic->ic_wme.wme_hipri_traffic++;
410 rxseq = le16toh(*(uint16_t *)wh->i_seq);
411 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
412 (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
413 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
414 /* duplicate, discard */
415 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
417 "seqno <%u,%u> fragno <%u,%u> tid %u",
418 rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
419 ni->ni_rxseqs[tid] >>
420 IEEE80211_SEQ_SEQ_SHIFT,
421 rxseq & IEEE80211_SEQ_FRAG_MASK,
423 IEEE80211_SEQ_FRAG_MASK,
425 vap->iv_stats.is_rx_dup++;
426 IEEE80211_NODE_STAT(ni, rx_dup);
429 ni->ni_rxseqs[tid] = rxseq;
434 case IEEE80211_FC0_TYPE_DATA:
435 hdrspace = ieee80211_hdrspace(ic, wh);
436 if (m->m_len < hdrspace &&
437 (m = m_pullup(m, hdrspace)) == NULL) {
438 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
439 ni->ni_macaddr, NULL,
440 "data too short: expecting %u", hdrspace);
441 vap->iv_stats.is_rx_tooshort++;
444 if (dir != IEEE80211_FC1_DIR_NODS) {
445 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
446 wh, "data", "incorrect dir 0x%x", dir);
447 vap->iv_stats.is_rx_wrongdir++;
450 /* XXX no power-save support */
453 * Handle A-MPDU re-ordering. If the frame is to be
454 * processed directly then ieee80211_ampdu_reorder
455 * will return 0; otherwise it has consumed the mbuf
456 * and we should do nothing more with it.
458 if ((m->m_flags & M_AMPDU) &&
459 ieee80211_ampdu_reorder(ni, m) != 0) {
466 * Handle privacy requirements. Note that we
467 * must not be preempted from here until after
468 * we (potentially) call ieee80211_crypto_demic;
469 * otherwise we may violate assumptions in the
470 * crypto cipher modules used to do delayed update
471 * of replay sequence numbers.
473 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
474 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
476 * Discard encrypted frames when privacy is off.
478 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
479 wh, "WEP", "%s", "PRIVACY off");
480 vap->iv_stats.is_rx_noprivacy++;
481 IEEE80211_NODE_STAT(ni, rx_noprivacy);
484 key = ieee80211_crypto_decap(ni, m, hdrspace);
486 /* NB: stats+msgs handled in crypto_decap */
487 IEEE80211_NODE_STAT(ni, rx_wepfail);
490 wh = mtod(m, struct ieee80211_frame *);
491 wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
493 /* XXX M_WEP and IEEE80211_F_PRIVACY */
498 * Save QoS bits for use below--before we strip the header.
500 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
501 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
502 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
503 ((struct ieee80211_qosframe *)wh)->i_qos[0];
508 * Next up, any fragmentation.
510 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
511 m = ieee80211_defrag(ni, m, hdrspace);
513 /* Fragment dropped or frame not complete yet */
517 wh = NULL; /* no longer valid, catch any uses */
520 * Next strip any MSDU crypto bits.
522 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
523 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
524 ni->ni_macaddr, "data", "%s", "demic error");
525 vap->iv_stats.is_rx_demicfail++;
526 IEEE80211_NODE_STAT(ni, rx_demicfail);
530 /* copy to listener after decrypt */
531 if (ieee80211_radiotap_active_vap(vap))
532 ieee80211_radiotap_rx(vap, m);
536 * Finally, strip the 802.11 header.
538 m = ieee80211_decap(vap, m, hdrspace);
540 /* XXX mask bit to check for both */
541 /* don't count Null data frames as errors */
542 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
543 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
545 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
546 ni->ni_macaddr, "data", "%s", "decap error");
547 vap->iv_stats.is_rx_decap++;
548 IEEE80211_NODE_STAT(ni, rx_decap);
551 eh = mtod(m, struct ether_header *);
552 if (!ieee80211_node_is_authorized(ni)) {
554 * Deny any non-PAE frames received prior to
555 * authorization. For open/shared-key
556 * authentication the port is mark authorized
557 * after authentication completes. For 802.1x
558 * the port is not marked authorized by the
559 * authenticator until the handshake has completed.
561 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
562 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
563 eh->ether_shost, "data",
564 "unauthorized port: ether type 0x%x len %u",
565 eh->ether_type, m->m_pkthdr.len);
566 vap->iv_stats.is_rx_unauth++;
567 IEEE80211_NODE_STAT(ni, rx_unauth);
572 * When denying unencrypted frames, discard
573 * any non-PAE frames received without encryption.
575 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
576 (key == NULL && (m->m_flags & M_WEP) == 0) &&
577 eh->ether_type != htons(ETHERTYPE_PAE)) {
579 * Drop unencrypted frames.
581 vap->iv_stats.is_rx_unencrypted++;
582 IEEE80211_NODE_STAT(ni, rx_unencrypted);
586 /* XXX require HT? */
587 if (qos & IEEE80211_QOS_AMSDU) {
588 m = ieee80211_decap_amsdu(ni, m);
590 return IEEE80211_FC0_TYPE_DATA;
592 #ifdef IEEE80211_SUPPORT_SUPERG
593 m = ieee80211_decap_fastframe(vap, ni, m);
595 return IEEE80211_FC0_TYPE_DATA;
598 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
599 ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
601 ieee80211_deliver_data(vap, ni, m);
602 return IEEE80211_FC0_TYPE_DATA;
604 case IEEE80211_FC0_TYPE_MGT:
605 vap->iv_stats.is_rx_mgmt++;
606 IEEE80211_NODE_STAT(ni, rx_mgmt);
607 if (dir != IEEE80211_FC1_DIR_NODS) {
608 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
609 wh, "data", "incorrect dir 0x%x", dir);
610 vap->iv_stats.is_rx_wrongdir++;
613 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
614 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
615 ni->ni_macaddr, "mgt", "too short: len %u",
617 vap->iv_stats.is_rx_tooshort++;
620 #ifdef IEEE80211_DEBUG
621 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
622 ieee80211_msg_dumppkts(vap)) {
623 if_printf(ifp, "received %s from %6D rssi %d\n",
624 ieee80211_mgt_subtype_name[subtype >>
625 IEEE80211_FC0_SUBTYPE_SHIFT],
626 wh->i_addr2, ":", rssi);
629 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
630 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
631 wh, NULL, "%s", "WEP set but not permitted");
632 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
635 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
638 case IEEE80211_FC0_TYPE_CTL:
639 vap->iv_stats.is_rx_ctl++;
640 IEEE80211_NODE_STAT(ni, rx_ctrl);
641 vap->iv_recv_ctl(ni, m, subtype);
645 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
646 wh, "bad", "frame type 0x%x", type);
647 /* should not come here */
654 if (need_tap && ieee80211_radiotap_active_vap(vap))
655 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 const struct ieee80211_action *ia;
825 if (vap->iv_state != IEEE80211_S_RUN) {
826 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
827 wh, NULL, "wrong state %s",
828 ieee80211_state_name[vap->iv_state]);
829 vap->iv_stats.is_rx_mgtdiscard++;
833 * action frame format:
838 IEEE80211_VERIFY_LENGTH(efrm - frm,
839 sizeof(struct ieee80211_action), return);
840 ia = (const struct ieee80211_action *) frm;
842 vap->iv_stats.is_rx_action++;
843 IEEE80211_NODE_STAT(ni, rx_action);
845 /* verify frame payloads but defer processing */
846 /* XXX maybe push this to method */
847 switch (ia->ia_category) {
848 case IEEE80211_ACTION_CAT_BA:
849 switch (ia->ia_action) {
850 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
851 IEEE80211_VERIFY_LENGTH(efrm - frm,
852 sizeof(struct ieee80211_action_ba_addbarequest),
855 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
856 IEEE80211_VERIFY_LENGTH(efrm - frm,
857 sizeof(struct ieee80211_action_ba_addbaresponse),
860 case IEEE80211_ACTION_BA_DELBA:
861 IEEE80211_VERIFY_LENGTH(efrm - frm,
862 sizeof(struct ieee80211_action_ba_delba),
867 case IEEE80211_ACTION_CAT_HT:
868 switch (ia->ia_action) {
869 case IEEE80211_ACTION_HT_TXCHWIDTH:
870 IEEE80211_VERIFY_LENGTH(efrm - frm,
871 sizeof(struct ieee80211_action_ht_txchwidth),
877 ic->ic_recv_action(ni, wh, frm, efrm);
881 case IEEE80211_FC0_SUBTYPE_AUTH:
882 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
883 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
884 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
885 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
886 case IEEE80211_FC0_SUBTYPE_DEAUTH:
887 case IEEE80211_FC0_SUBTYPE_DISASSOC:
888 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
889 wh, NULL, "%s", "not handled");
890 vap->iv_stats.is_rx_mgtdiscard++;
894 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
895 wh, "mgt", "subtype 0x%x not handled", subtype);
896 vap->iv_stats.is_rx_badsubtype++;
900 #undef IEEE80211_VERIFY_LENGTH
901 #undef IEEE80211_VERIFY_ELEMENT
904 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
905 int subtype, int rssi, int nf)
907 struct ieee80211vap *vap = ni->ni_vap;
908 struct ieee80211com *ic = ni->ni_ic;
911 * Process management frames when scanning; useful for doing
914 if (ic->ic_flags & IEEE80211_F_SCAN)
915 adhoc_recv_mgmt(ni, m0, subtype, rssi, nf);
917 vap->iv_stats.is_rx_mgtdiscard++;
921 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype)