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;
133 #ifdef IEEE80211_DEBUG
134 char ethstr[ETHER_ADDRSTRLEN + 1];
137 ostate = vap->iv_state;
138 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
139 __func__, ieee80211_state_name[ostate],
140 ieee80211_state_name[nstate], arg);
141 vap->iv_state = nstate; /* state transition */
142 if (ostate != IEEE80211_S_SCAN)
143 ieee80211_cancel_scan(vap); /* background scan */
144 ni = vap->iv_bss; /* NB: no reference held */
146 case IEEE80211_S_INIT:
148 case IEEE80211_S_SCAN:
149 ieee80211_cancel_scan(vap);
154 if (ostate != IEEE80211_S_INIT) {
155 /* NB: optimize INIT -> INIT case */
156 ieee80211_reset_bss(vap);
159 case IEEE80211_S_SCAN:
161 case IEEE80211_S_RUN: /* beacon miss */
162 /* purge station table; entries are stale */
163 ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap);
165 case IEEE80211_S_INIT:
166 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
167 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
169 * Already have a channel; bypass the
170 * scan and startup immediately.
172 ieee80211_create_ibss(vap, vap->iv_des_chan);
176 * Initiate a scan. We can come here as a result
177 * of an IEEE80211_IOC_SCAN_REQ too in which case
178 * the vap will be marked with IEEE80211_FEXT_SCANREQ
179 * and the scan request parameters will be present
180 * in iv_scanreq. Otherwise we do the default.
182 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
183 ieee80211_check_scan(vap,
184 vap->iv_scanreq_flags,
185 vap->iv_scanreq_duration,
186 vap->iv_scanreq_mindwell,
187 vap->iv_scanreq_maxdwell,
188 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
189 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
191 ieee80211_check_scan_current(vap);
193 case IEEE80211_S_SCAN:
195 * This can happen because of a change in state
196 * that requires a reset. Trigger a new scan
197 * unless we're in manual roaming mode in which
198 * case an application must issue an explicit request.
200 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
201 ieee80211_check_scan_current(vap);
207 case IEEE80211_S_RUN:
208 if (vap->iv_flags & IEEE80211_F_WPA) {
209 /* XXX validate prerequisites */
212 case IEEE80211_S_SCAN:
213 #ifdef IEEE80211_DEBUG
214 if (ieee80211_msg_debug(vap)) {
216 "synchronized with %s ssid ",
217 kether_ntoa(ni->ni_bssid, ethstr));
218 ieee80211_print_essid(vap->iv_bss->ni_essid,
221 kprintf(" channel %d start %uMb\n",
222 ieee80211_chan2ieee(ic, ic->ic_curchan),
223 IEEE80211_RATE2MBS(ni->ni_txrate));
231 * When 802.1x is not in use mark the port authorized
232 * at this point so traffic can flow.
234 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
235 ieee80211_node_authorize(ni);
237 * Fake association when joining an existing bss.
239 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) &&
240 ic->ic_newassoc != NULL)
241 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN);
243 case IEEE80211_S_SLEEP:
244 ieee80211_sta_pwrsave(vap, 0);
248 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
249 "%s: unexpected state transition %s -> %s\n", __func__,
250 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
257 * Decide if a received management frame should be
258 * printed when debugging is enabled. This filters some
259 * of the less interesting frames that come frequently
263 doprint(struct ieee80211vap *vap, int subtype)
266 case IEEE80211_FC0_SUBTYPE_BEACON:
267 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
268 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
275 * Process a received frame. The node associated with the sender
276 * should be supplied. If nothing was found in the node table then
277 * the caller is assumed to supply a reference to iv_bss instead.
278 * The RSSI and a timestamp are also supplied. The RSSI data is used
279 * during AP scanning to select a AP to associate with; it can have
280 * any units so long as values have consistent units and higher values
281 * mean ``better signal''. The receive timestamp is currently not used
282 * by the 802.11 layer.
285 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
287 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
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;
299 #ifdef IEEE80211_DEBUG
300 char ethstr[ETHER_ADDRSTRLEN + 1];
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 ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
418 (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
419 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
420 /* duplicate, discard */
421 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
423 "seqno <%u,%u> fragno <%u,%u> tid %u",
424 rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
425 ni->ni_rxseqs[tid] >>
426 IEEE80211_SEQ_SEQ_SHIFT,
427 rxseq & IEEE80211_SEQ_FRAG_MASK,
429 IEEE80211_SEQ_FRAG_MASK,
431 vap->iv_stats.is_rx_dup++;
432 IEEE80211_NODE_STAT(ni, rx_dup);
435 ni->ni_rxseqs[tid] = rxseq;
440 case IEEE80211_FC0_TYPE_DATA:
441 hdrspace = ieee80211_hdrspace(ic, wh);
442 if (m->m_len < hdrspace &&
443 (m = m_pullup(m, hdrspace)) == NULL) {
444 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
445 ni->ni_macaddr, NULL,
446 "data too short: expecting %u", hdrspace);
447 vap->iv_stats.is_rx_tooshort++;
450 if (dir != IEEE80211_FC1_DIR_NODS) {
451 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
452 wh, "data", "incorrect dir 0x%x", dir);
453 vap->iv_stats.is_rx_wrongdir++;
456 /* XXX no power-save support */
459 * Handle A-MPDU re-ordering. If the frame is to be
460 * processed directly then ieee80211_ampdu_reorder
461 * will return 0; otherwise it has consumed the mbuf
462 * and we should do nothing more with it.
464 if ((m->m_flags & M_AMPDU) &&
465 ieee80211_ampdu_reorder(ni, m) != 0) {
472 * Handle privacy requirements. Note that we
473 * must not be preempted from here until after
474 * we (potentially) call ieee80211_crypto_demic;
475 * otherwise we may violate assumptions in the
476 * crypto cipher modules used to do delayed update
477 * of replay sequence numbers.
479 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
480 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
482 * Discard encrypted frames when privacy is off.
484 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
485 wh, "WEP", "%s", "PRIVACY off");
486 vap->iv_stats.is_rx_noprivacy++;
487 IEEE80211_NODE_STAT(ni, rx_noprivacy);
490 key = ieee80211_crypto_decap(ni, m, hdrspace);
492 /* NB: stats+msgs handled in crypto_decap */
493 IEEE80211_NODE_STAT(ni, rx_wepfail);
496 wh = mtod(m, struct ieee80211_frame *);
497 wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
499 /* XXX M_WEP and IEEE80211_F_PRIVACY */
504 * Save QoS bits for use below--before we strip the header.
506 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
507 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
508 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
509 ((struct ieee80211_qosframe *)wh)->i_qos[0];
514 * Next up, any fragmentation.
516 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
517 m = ieee80211_defrag(ni, m, hdrspace);
519 /* Fragment dropped or frame not complete yet */
523 wh = NULL; /* no longer valid, catch any uses */
526 * Next strip any MSDU crypto bits.
528 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
529 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
530 ni->ni_macaddr, "data", "%s", "demic error");
531 vap->iv_stats.is_rx_demicfail++;
532 IEEE80211_NODE_STAT(ni, rx_demicfail);
536 /* copy to listener after decrypt */
537 if (ieee80211_radiotap_active_vap(vap))
538 ieee80211_radiotap_rx(vap, m);
542 * Finally, strip the 802.11 header.
544 m = ieee80211_decap(vap, m, hdrspace);
546 /* XXX mask bit to check for both */
547 /* don't count Null data frames as errors */
548 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
549 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
551 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
552 ni->ni_macaddr, "data", "%s", "decap error");
553 vap->iv_stats.is_rx_decap++;
554 IEEE80211_NODE_STAT(ni, rx_decap);
557 eh = mtod(m, struct ether_header *);
558 if (!ieee80211_node_is_authorized(ni)) {
560 * Deny any non-PAE frames received prior to
561 * authorization. For open/shared-key
562 * authentication the port is mark authorized
563 * after authentication completes. For 802.1x
564 * the port is not marked authorized by the
565 * authenticator until the handshake has completed.
567 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
568 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
569 eh->ether_shost, "data",
570 "unauthorized port: ether type 0x%x len %u",
571 eh->ether_type, m->m_pkthdr.len);
572 vap->iv_stats.is_rx_unauth++;
573 IEEE80211_NODE_STAT(ni, rx_unauth);
578 * When denying unencrypted frames, discard
579 * any non-PAE frames received without encryption.
581 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
582 (key == NULL && (m->m_flags & M_WEP) == 0) &&
583 eh->ether_type != htons(ETHERTYPE_PAE)) {
585 * Drop unencrypted frames.
587 vap->iv_stats.is_rx_unencrypted++;
588 IEEE80211_NODE_STAT(ni, rx_unencrypted);
592 /* XXX require HT? */
593 if (qos & IEEE80211_QOS_AMSDU) {
594 m = ieee80211_decap_amsdu(ni, m);
596 return IEEE80211_FC0_TYPE_DATA;
598 #ifdef IEEE80211_SUPPORT_SUPERG
599 m = ieee80211_decap_fastframe(vap, ni, m);
601 return IEEE80211_FC0_TYPE_DATA;
604 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
605 ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
607 ieee80211_deliver_data(vap, ni, m);
608 return IEEE80211_FC0_TYPE_DATA;
610 case IEEE80211_FC0_TYPE_MGT:
611 vap->iv_stats.is_rx_mgmt++;
612 IEEE80211_NODE_STAT(ni, rx_mgmt);
613 if (dir != IEEE80211_FC1_DIR_NODS) {
614 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
615 wh, "data", "incorrect dir 0x%x", dir);
616 vap->iv_stats.is_rx_wrongdir++;
619 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
620 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
621 ni->ni_macaddr, "mgt", "too short: len %u",
623 vap->iv_stats.is_rx_tooshort++;
626 #ifdef IEEE80211_DEBUG
627 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
628 ieee80211_msg_dumppkts(vap)) {
629 if_printf(ifp, "received %s from %s rssi %d\n",
630 ieee80211_mgt_subtype_name[subtype >>
631 IEEE80211_FC0_SUBTYPE_SHIFT],
632 kether_ntoa(wh->i_addr2, ethstr), rssi);
635 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
636 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
637 wh, NULL, "%s", "WEP set but not permitted");
638 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
641 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
644 case IEEE80211_FC0_TYPE_CTL:
645 vap->iv_stats.is_rx_ctl++;
646 IEEE80211_NODE_STAT(ni, rx_ctrl);
647 vap->iv_recv_ctl(ni, m, subtype);
651 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
652 wh, "bad", "frame type 0x%x", type);
653 /* should not come here */
660 if (need_tap && ieee80211_radiotap_active_vap(vap))
661 ieee80211_radiotap_rx(vap, m);
669 is11bclient(const uint8_t *rates, const uint8_t *xrates)
671 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
674 /* NB: the 11b clients we care about will not have xrates */
675 if (xrates != NULL || rates == NULL)
677 for (i = 0; i < rates[1]; i++) {
678 int r = rates[2+i] & IEEE80211_RATE_VAL;
679 if (r > 2*11 || ((1<<r) & brates) == 0)
686 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
687 int subtype, int rssi, int nf)
689 struct ieee80211vap *vap = ni->ni_vap;
690 struct ieee80211com *ic = ni->ni_ic;
691 struct ieee80211_frame *wh;
693 uint8_t *ssid, *rates, *xrates;
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 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
762 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
763 if (vap->iv_state != IEEE80211_S_RUN) {
764 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
765 wh, NULL, "wrong state %s",
766 ieee80211_state_name[vap->iv_state]);
767 vap->iv_stats.is_rx_mgtdiscard++;
770 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
771 /* frame must be directed */
772 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
773 wh, NULL, "%s", "not unicast");
774 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */
781 * [tlv] supported rates
782 * [tlv] extended supported rates
784 ssid = rates = xrates = NULL;
785 while (efrm - frm > 1) {
786 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
788 case IEEE80211_ELEMID_SSID:
791 case IEEE80211_ELEMID_RATES:
794 case IEEE80211_ELEMID_XRATES:
800 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
802 IEEE80211_VERIFY_ELEMENT(xrates,
803 IEEE80211_RATE_MAXSIZE - rates[1], return);
804 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
805 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
806 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
807 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
809 "%s", "no ssid with ssid suppression enabled");
810 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
814 /* XXX find a better class or define it's own */
815 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
816 "%s", "recv probe req");
818 * Some legacy 11b clients cannot hack a complete
819 * probe response frame. When the request includes
820 * only a bare-bones rate set, communicate this to
823 ieee80211_send_proberesp(vap, wh->i_addr2,
824 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
827 case IEEE80211_FC0_SUBTYPE_ACTION: {
828 const struct ieee80211_action *ia;
830 if (vap->iv_state != IEEE80211_S_RUN) {
831 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
832 wh, NULL, "wrong state %s",
833 ieee80211_state_name[vap->iv_state]);
834 vap->iv_stats.is_rx_mgtdiscard++;
838 * action frame format:
843 IEEE80211_VERIFY_LENGTH(efrm - frm,
844 sizeof(struct ieee80211_action), return);
845 ia = (const struct ieee80211_action *) frm;
847 vap->iv_stats.is_rx_action++;
848 IEEE80211_NODE_STAT(ni, rx_action);
850 /* verify frame payloads but defer processing */
851 /* XXX maybe push this to method */
852 switch (ia->ia_category) {
853 case IEEE80211_ACTION_CAT_BA:
854 switch (ia->ia_action) {
855 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
856 IEEE80211_VERIFY_LENGTH(efrm - frm,
857 sizeof(struct ieee80211_action_ba_addbarequest),
860 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
861 IEEE80211_VERIFY_LENGTH(efrm - frm,
862 sizeof(struct ieee80211_action_ba_addbaresponse),
865 case IEEE80211_ACTION_BA_DELBA:
866 IEEE80211_VERIFY_LENGTH(efrm - frm,
867 sizeof(struct ieee80211_action_ba_delba),
872 case IEEE80211_ACTION_CAT_HT:
873 switch (ia->ia_action) {
874 case IEEE80211_ACTION_HT_TXCHWIDTH:
875 IEEE80211_VERIFY_LENGTH(efrm - frm,
876 sizeof(struct ieee80211_action_ht_txchwidth),
882 ic->ic_recv_action(ni, wh, frm, efrm);
886 case IEEE80211_FC0_SUBTYPE_AUTH:
887 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
888 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
889 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
890 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
891 case IEEE80211_FC0_SUBTYPE_DEAUTH:
892 case IEEE80211_FC0_SUBTYPE_DISASSOC:
893 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
894 wh, NULL, "%s", "not handled");
895 vap->iv_stats.is_rx_mgtdiscard++;
899 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
900 wh, "mgt", "subtype 0x%x not handled", subtype);
901 vap->iv_stats.is_rx_badsubtype++;
905 #undef IEEE80211_VERIFY_LENGTH
906 #undef IEEE80211_VERIFY_ELEMENT
909 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
910 int subtype, int rssi, int nf)
912 struct ieee80211vap *vap = ni->ni_vap;
913 struct ieee80211com *ic = ni->ni_ic;
916 * Process management frames when scanning; useful for doing
919 if (ic->ic_flags & IEEE80211_F_SCAN)
920 adhoc_recv_mgmt(ni, m0, subtype, rssi, nf);
922 vap->iv_stats.is_rx_mgtdiscard++;
926 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype)