2 * Copyright (c) 2007-2008 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_hostap.c 203422 2010-02-03 10:07:43Z rpaulo $
29 * IEEE 802.11 HOSTAP 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/ifq_var.h>
51 #include <net/ethernet.h>
52 #include <net/route.h>
56 #include <netproto/802_11/ieee80211_var.h>
57 #include <netproto/802_11/ieee80211_hostap.h>
58 #include <netproto/802_11/ieee80211_input.h>
59 #ifdef IEEE80211_SUPPORT_SUPERG
60 #include <netproto/802_11/ieee80211_superg.h>
62 #include <netproto/802_11/ieee80211_wds.h>
64 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2)
66 static void hostap_vattach(struct ieee80211vap *);
67 static int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int);
68 static int hostap_input(struct ieee80211_node *ni, struct mbuf *m,
70 static void hostap_deliver_data(struct ieee80211vap *,
71 struct ieee80211_node *, struct mbuf *);
72 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *,
73 int subtype, int rssi, int nf);
74 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int);
75 static void hostap_recv_pspoll(struct ieee80211_node *, struct mbuf *);
78 ieee80211_hostap_attach(struct ieee80211com *ic)
80 ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach;
84 ieee80211_hostap_detach(struct ieee80211com *ic)
89 hostap_vdetach(struct ieee80211vap *vap)
94 hostap_vattach(struct ieee80211vap *vap)
96 vap->iv_newstate = hostap_newstate;
97 vap->iv_input = hostap_input;
98 vap->iv_recv_mgmt = hostap_recv_mgmt;
99 vap->iv_recv_ctl = hostap_recv_ctl;
100 vap->iv_opdetach = hostap_vdetach;
101 vap->iv_deliver_data = hostap_deliver_data;
105 sta_disassoc(void *arg, struct ieee80211_node *ni)
107 struct ieee80211vap *vap = arg;
109 if (ni->ni_vap == vap && ni->ni_associd != 0) {
110 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC,
111 IEEE80211_REASON_ASSOC_LEAVE);
112 ieee80211_node_leave(ni);
117 sta_csa(void *arg, struct ieee80211_node *ni)
119 struct ieee80211vap *vap = arg;
121 if (ni->ni_vap == vap && ni->ni_associd != 0)
122 if (ni->ni_inact > vap->iv_inact_init) {
123 ni->ni_inact = vap->iv_inact_init;
124 IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
125 "%s: inact %u", __func__, ni->ni_inact);
130 sta_drop(void *arg, struct ieee80211_node *ni)
132 struct ieee80211vap *vap = arg;
134 if (ni->ni_vap == vap && ni->ni_associd != 0)
135 ieee80211_node_leave(ni);
139 * Does a channel change require associated stations to re-associate
140 * so protocol state is correct. This is used when doing CSA across
141 * bands or similar (e.g. HT -> legacy).
144 isbandchange(struct ieee80211com *ic)
146 return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) &
147 (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF |
148 IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0;
152 * IEEE80211_M_HOSTAP vap state machine handler.
155 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
157 struct ieee80211com *ic = vap->iv_ic;
158 enum ieee80211_state ostate;
159 #ifdef IEEE80211_DEBUG
160 char ethstr[ETHER_ADDRSTRLEN + 1];
163 ostate = vap->iv_state;
164 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
165 __func__, ieee80211_state_name[ostate],
166 ieee80211_state_name[nstate], arg);
167 vap->iv_state = nstate; /* state transition */
168 if (ostate != IEEE80211_S_SCAN)
169 ieee80211_cancel_scan(vap); /* background scan */
171 case IEEE80211_S_INIT:
173 case IEEE80211_S_SCAN:
174 ieee80211_cancel_scan(vap);
176 case IEEE80211_S_CAC:
177 ieee80211_dfs_cac_stop(vap);
179 case IEEE80211_S_RUN:
180 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
185 if (ostate != IEEE80211_S_INIT) {
186 /* NB: optimize INIT -> INIT case */
187 ieee80211_reset_bss(vap);
189 if (vap->iv_auth->ia_detach != NULL)
190 vap->iv_auth->ia_detach(vap);
192 case IEEE80211_S_SCAN:
194 case IEEE80211_S_CSA:
195 case IEEE80211_S_RUN:
196 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
198 * Clear overlapping BSS state; the beacon frame
199 * will be reconstructed on transition to the RUN
200 * state and the timeout routines check if the flag
201 * is set before doing anything so this is sufficient.
203 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
204 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
206 case IEEE80211_S_CAC:
208 * NB: We may get here because of a manual channel
209 * change in which case we need to stop CAC
210 * XXX no need to stop if ostate RUN but it's ok
212 ieee80211_dfs_cac_stop(vap);
214 case IEEE80211_S_INIT:
215 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
216 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
218 * Already have a channel; bypass the
219 * scan and startup immediately.
220 * ieee80211_create_ibss will call back to
221 * move us to RUN state.
223 ieee80211_create_ibss(vap, vap->iv_des_chan);
227 * Initiate a scan. We can come here as a result
228 * of an IEEE80211_IOC_SCAN_REQ too in which case
229 * the vap will be marked with IEEE80211_FEXT_SCANREQ
230 * and the scan request parameters will be present
231 * in iv_scanreq. Otherwise we do the default.
233 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
234 ieee80211_check_scan(vap,
235 vap->iv_scanreq_flags,
236 vap->iv_scanreq_duration,
237 vap->iv_scanreq_mindwell,
238 vap->iv_scanreq_maxdwell,
239 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
240 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
242 ieee80211_check_scan_current(vap);
244 case IEEE80211_S_SCAN:
246 * A state change requires a reset; scan.
248 ieee80211_check_scan_current(vap);
254 case IEEE80211_S_CAC:
256 * Start CAC on a DFS channel. We come here when starting
257 * a bss on a DFS channel (see ieee80211_create_ibss).
259 ieee80211_dfs_cac_start(vap);
261 case IEEE80211_S_RUN:
262 if (vap->iv_flags & IEEE80211_F_WPA) {
263 /* XXX validate prerequisites */
266 case IEEE80211_S_INIT:
268 * Already have a channel; bypass the
269 * scan and startup immediately.
270 * Note that ieee80211_create_ibss will call
271 * back to do a RUN->RUN state change.
273 ieee80211_create_ibss(vap,
274 ieee80211_ht_adjust_channel(ic,
275 ic->ic_curchan, vap->iv_flags_ht));
276 /* NB: iv_bss is changed on return */
278 case IEEE80211_S_CAC:
280 * NB: This is the normal state change when CAC
281 * expires and no radar was detected; no need to
282 * clear the CAC timer as it's already expired.
285 case IEEE80211_S_CSA:
287 * Shorten inactivity timer of associated stations
288 * to weed out sta's that don't follow a CSA.
290 ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap);
292 * Update bss node channel to reflect where
293 * we landed after CSA.
295 ieee80211_node_set_chan(vap->iv_bss,
296 ieee80211_ht_adjust_channel(ic, ic->ic_curchan,
297 ieee80211_htchanflags(vap->iv_bss->ni_chan)));
298 /* XXX bypass debug msgs */
300 case IEEE80211_S_SCAN:
301 case IEEE80211_S_RUN:
302 #ifdef IEEE80211_DEBUG
303 if (ieee80211_msg_debug(vap)) {
304 struct ieee80211_node *ni = vap->iv_bss;
306 "synchronized with %s ssid ",
307 kether_ntoa(ni->ni_bssid, ethstr));
308 ieee80211_print_essid(ni->ni_essid,
311 kprintf(" channel %d start %uMb\n",
312 ieee80211_chan2ieee(ic, ic->ic_curchan),
313 IEEE80211_RATE2MBS(ni->ni_txrate));
321 * Start/stop the authenticator. We delay until here
322 * to allow configuration to happen out of order.
324 if (vap->iv_auth->ia_attach != NULL) {
325 /* XXX check failure */
326 vap->iv_auth->ia_attach(vap);
327 } else if (vap->iv_auth->ia_detach != NULL) {
328 vap->iv_auth->ia_detach(vap);
330 ieee80211_node_authorize(vap->iv_bss);
332 case IEEE80211_S_CSA:
333 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) {
335 * On a ``band change'' silently drop associated
336 * stations as they must re-associate before they
337 * can pass traffic (as otherwise protocol state
338 * such as capabilities and the negotiated rate
339 * set may/will be wrong).
341 ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap);
351 hostap_deliver_data(struct ieee80211vap *vap,
352 struct ieee80211_node *ni, struct mbuf *m)
354 struct ether_header *eh = mtod(m, struct ether_header *);
355 struct ifnet *ifp = vap->iv_ifp;
357 /* clear driver/net80211 flags before passing up */
358 m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST);
360 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP,
361 ("gack, opmode %d", vap->iv_opmode));
366 IEEE80211_NODE_STAT(ni, rx_data);
367 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
368 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
369 m->m_flags |= M_MCAST; /* XXX M_BCAST? */
370 IEEE80211_NODE_STAT(ni, rx_mcast);
372 IEEE80211_NODE_STAT(ni, rx_ucast);
374 /* perform as a bridge within the AP */
375 if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) {
376 struct mbuf *mcopy = NULL;
378 if (m->m_flags & M_MCAST) {
379 mcopy = m_dup(m, MB_DONTWAIT);
383 mcopy->m_flags |= M_MCAST;
386 * Check if the destination is associated with the
387 * same vap and authorized to receive traffic.
388 * Beware of traffic destined for the vap itself;
389 * sending it will not work; just let it be delivered
392 struct ieee80211_node *sta = ieee80211_find_vap_node(
393 &vap->iv_ic->ic_sta, vap, eh->ether_dhost);
395 if (ieee80211_node_is_authorized(sta)) {
397 * Beware of sending to ourself; this
398 * needs to happen via the normal
401 if (sta != vap->iv_bss) {
406 vap->iv_stats.is_rx_unauth++;
407 IEEE80211_NODE_STAT(sta, rx_unauth);
409 ieee80211_free_node(sta);
414 err = ieee80211_handoff(ifp, mcopy);
416 /* NB: IFQ_HANDOFF reclaims mcopy */
424 * Mark frame as coming from vap's interface.
426 m->m_pkthdr.rcvif = ifp;
427 if (m->m_flags & M_MCAST) {
429 * Spam DWDS vap's w/ multicast traffic.
431 /* XXX only if dwds in use? */
432 ieee80211_dwds_mcast(vap, m);
434 if (ni->ni_vlan != 0) {
435 /* attach vlan tag */
436 m->m_pkthdr.ether_vlantag = ni->ni_vlan;
437 m->m_flags |= M_VLANTAG;
439 ifp->if_input(ifp, m);
444 * Decide if a received management frame should be
445 * printed when debugging is enabled. This filters some
446 * of the less interesting frames that come frequently
450 doprint(struct ieee80211vap *vap, int subtype)
453 case IEEE80211_FC0_SUBTYPE_BEACON:
454 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
455 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
462 * Process a received frame. The node associated with the sender
463 * should be supplied. If nothing was found in the node table then
464 * the caller is assumed to supply a reference to iv_bss instead.
465 * The RSSI and a timestamp are also supplied. The RSSI data is used
466 * during AP scanning to select a AP to associate with; it can have
467 * any units so long as values have consistent units and higher values
468 * mean ``better signal''. The receive timestamp is currently not used
469 * by the 802.11 layer.
472 hostap_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
474 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
475 #define HAS_SEQ(type) ((type & 0x4) == 0)
476 struct ieee80211vap *vap = ni->ni_vap;
477 struct ieee80211com *ic = ni->ni_ic;
478 struct ifnet *ifp = vap->iv_ifp;
479 struct ieee80211_frame *wh;
480 struct ieee80211_key *key;
481 struct ether_header *eh;
482 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
483 uint8_t dir, type, subtype, qos;
486 #ifdef IEEE80211_DEBUG
487 char ethstr[ETHER_ADDRSTRLEN + 1];
490 if (m->m_flags & M_AMPDU_MPDU) {
492 * Fastpath for A-MPDU reorder q resubmission. Frames
493 * w/ M_AMPDU_MPDU marked have already passed through
494 * here but were received out of order and been held on
495 * the reorder queue. When resubmitted they are marked
496 * with the M_AMPDU_MPDU flag and we can bypass most of
497 * the normal processing.
499 wh = mtod(m, struct ieee80211_frame *);
500 type = IEEE80211_FC0_TYPE_DATA;
501 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
502 subtype = IEEE80211_FC0_SUBTYPE_QOS;
503 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
507 KASSERT(ni != NULL, ("null node"));
508 ni->ni_inact = ni->ni_inact_reload;
510 type = -1; /* undefined */
512 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
513 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
514 ni->ni_macaddr, NULL,
515 "too short (1): len %u", m->m_pkthdr.len);
516 vap->iv_stats.is_rx_tooshort++;
520 * Bit of a cheat here, we use a pointer for a 3-address
521 * frame format but don't reference fields past outside
522 * ieee80211_frame_min w/o first validating the data is
525 wh = mtod(m, struct ieee80211_frame *);
527 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
528 IEEE80211_FC0_VERSION_0) {
529 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
530 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
531 wh->i_fc[0], wh->i_fc[1]);
532 vap->iv_stats.is_rx_badversion++;
536 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
537 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
538 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
539 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
540 if (dir != IEEE80211_FC1_DIR_NODS)
542 else if (type == IEEE80211_FC0_TYPE_CTL)
545 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
546 IEEE80211_DISCARD_MAC(vap,
547 IEEE80211_MSG_ANY, ni->ni_macaddr,
548 NULL, "too short (2): len %u",
550 vap->iv_stats.is_rx_tooshort++;
556 * Validate the bssid.
558 if (!(type == IEEE80211_FC0_TYPE_MGT &&
559 subtype == IEEE80211_FC0_SUBTYPE_BEACON) &&
560 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
561 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
562 /* not interested in */
563 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
564 bssid, NULL, "%s", "not to bss");
565 vap->iv_stats.is_rx_wrongbss++;
569 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
572 uint8_t tid = ieee80211_gettid(wh);
573 if (IEEE80211_QOS_HAS_SEQ(wh) &&
574 TID_TO_WME_AC(tid) >= WME_AC_VI)
575 ic->ic_wme.wme_hipri_traffic++;
576 rxseq = le16toh(*(uint16_t *)wh->i_seq);
577 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
578 (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
579 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
580 /* duplicate, discard */
581 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
583 "seqno <%u,%u> fragno <%u,%u> tid %u",
584 rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
585 ni->ni_rxseqs[tid] >>
586 IEEE80211_SEQ_SEQ_SHIFT,
587 rxseq & IEEE80211_SEQ_FRAG_MASK,
589 IEEE80211_SEQ_FRAG_MASK,
591 vap->iv_stats.is_rx_dup++;
592 IEEE80211_NODE_STAT(ni, rx_dup);
595 ni->ni_rxseqs[tid] = rxseq;
600 case IEEE80211_FC0_TYPE_DATA:
601 hdrspace = ieee80211_hdrspace(ic, wh);
602 if (m->m_len < hdrspace &&
603 (m = m_pullup(m, hdrspace)) == NULL) {
604 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
605 ni->ni_macaddr, NULL,
606 "data too short: expecting %u", hdrspace);
607 vap->iv_stats.is_rx_tooshort++;
610 if (!(dir == IEEE80211_FC1_DIR_TODS ||
611 (dir == IEEE80211_FC1_DIR_DSTODS &&
612 (vap->iv_flags & IEEE80211_F_DWDS)))) {
613 if (dir != IEEE80211_FC1_DIR_DSTODS) {
614 IEEE80211_DISCARD(vap,
615 IEEE80211_MSG_INPUT, wh, "data",
616 "incorrect dir 0x%x", dir);
618 IEEE80211_DISCARD(vap,
619 IEEE80211_MSG_INPUT |
620 IEEE80211_MSG_WDS, wh,
622 "%s", "DWDS not enabled");
624 vap->iv_stats.is_rx_wrongdir++;
627 /* check if source STA is associated */
628 if (ni == vap->iv_bss) {
629 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
630 wh, "data", "%s", "unknown src");
631 ieee80211_send_error(ni, wh->i_addr2,
632 IEEE80211_FC0_SUBTYPE_DEAUTH,
633 IEEE80211_REASON_NOT_AUTHED);
634 vap->iv_stats.is_rx_notassoc++;
637 if (ni->ni_associd == 0) {
638 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
639 wh, "data", "%s", "unassoc src");
640 IEEE80211_SEND_MGMT(ni,
641 IEEE80211_FC0_SUBTYPE_DISASSOC,
642 IEEE80211_REASON_NOT_ASSOCED);
643 vap->iv_stats.is_rx_notassoc++;
648 * Check for power save state change.
649 * XXX out-of-order A-MPDU frames?
651 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^
652 (ni->ni_flags & IEEE80211_NODE_PWR_MGT)))
653 ieee80211_node_pwrsave(ni,
654 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT);
656 * For 4-address packets handle WDS discovery
657 * notifications. Once a WDS link is setup frames
658 * are just delivered to the WDS vap (see below).
660 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) {
661 if (!ieee80211_node_is_authorized(ni)) {
662 IEEE80211_DISCARD(vap,
663 IEEE80211_MSG_INPUT |
664 IEEE80211_MSG_WDS, wh,
666 "%s", "unauthorized port");
667 vap->iv_stats.is_rx_unauth++;
668 IEEE80211_NODE_STAT(ni, rx_unauth);
671 ieee80211_dwds_discover(ni, m);
676 * Handle A-MPDU re-ordering. If the frame is to be
677 * processed directly then ieee80211_ampdu_reorder
678 * will return 0; otherwise it has consumed the mbuf
679 * and we should do nothing more with it.
681 if ((m->m_flags & M_AMPDU) &&
682 ieee80211_ampdu_reorder(ni, m) != 0) {
689 * Handle privacy requirements. Note that we
690 * must not be preempted from here until after
691 * we (potentially) call ieee80211_crypto_demic;
692 * otherwise we may violate assumptions in the
693 * crypto cipher modules used to do delayed update
694 * of replay sequence numbers.
696 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
697 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
699 * Discard encrypted frames when privacy is off.
701 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
702 wh, "WEP", "%s", "PRIVACY off");
703 vap->iv_stats.is_rx_noprivacy++;
704 IEEE80211_NODE_STAT(ni, rx_noprivacy);
707 key = ieee80211_crypto_decap(ni, m, hdrspace);
709 /* NB: stats+msgs handled in crypto_decap */
710 IEEE80211_NODE_STAT(ni, rx_wepfail);
713 wh = mtod(m, struct ieee80211_frame *);
714 wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
716 /* XXX M_WEP and IEEE80211_F_PRIVACY */
721 * Save QoS bits for use below--before we strip the header.
723 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
724 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
725 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
726 ((struct ieee80211_qosframe *)wh)->i_qos[0];
731 * Next up, any fragmentation.
733 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
734 m = ieee80211_defrag(ni, m, hdrspace);
736 /* Fragment dropped or frame not complete yet */
740 wh = NULL; /* no longer valid, catch any uses */
743 * Next strip any MSDU crypto bits.
745 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
746 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
747 ni->ni_macaddr, "data", "%s", "demic error");
748 vap->iv_stats.is_rx_demicfail++;
749 IEEE80211_NODE_STAT(ni, rx_demicfail);
752 /* copy to listener after decrypt */
753 if (ieee80211_radiotap_active_vap(vap))
754 ieee80211_radiotap_rx(vap, m);
757 * Finally, strip the 802.11 header.
759 m = ieee80211_decap(vap, m, hdrspace);
761 /* XXX mask bit to check for both */
762 /* don't count Null data frames as errors */
763 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
764 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
766 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
767 ni->ni_macaddr, "data", "%s", "decap error");
768 vap->iv_stats.is_rx_decap++;
769 IEEE80211_NODE_STAT(ni, rx_decap);
772 eh = mtod(m, struct ether_header *);
773 if (!ieee80211_node_is_authorized(ni)) {
775 * Deny any non-PAE frames received prior to
776 * authorization. For open/shared-key
777 * authentication the port is mark authorized
778 * after authentication completes. For 802.1x
779 * the port is not marked authorized by the
780 * authenticator until the handshake has completed.
782 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
783 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
784 eh->ether_shost, "data",
785 "unauthorized port: ether type 0x%x len %u",
786 eh->ether_type, m->m_pkthdr.len);
787 vap->iv_stats.is_rx_unauth++;
788 IEEE80211_NODE_STAT(ni, rx_unauth);
793 * When denying unencrypted frames, discard
794 * any non-PAE frames received without encryption.
796 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
797 (key == NULL && (m->m_flags & M_WEP) == 0) &&
798 eh->ether_type != htons(ETHERTYPE_PAE)) {
800 * Drop unencrypted frames.
802 vap->iv_stats.is_rx_unencrypted++;
803 IEEE80211_NODE_STAT(ni, rx_unencrypted);
807 /* XXX require HT? */
808 if (qos & IEEE80211_QOS_AMSDU) {
809 m = ieee80211_decap_amsdu(ni, m);
811 return IEEE80211_FC0_TYPE_DATA;
813 #ifdef IEEE80211_SUPPORT_SUPERG
814 m = ieee80211_decap_fastframe(vap, ni, m);
816 return IEEE80211_FC0_TYPE_DATA;
819 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
820 ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
822 hostap_deliver_data(vap, ni, m);
823 return IEEE80211_FC0_TYPE_DATA;
825 case IEEE80211_FC0_TYPE_MGT:
826 vap->iv_stats.is_rx_mgmt++;
827 IEEE80211_NODE_STAT(ni, rx_mgmt);
828 if (dir != IEEE80211_FC1_DIR_NODS) {
829 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
830 wh, "mgt", "incorrect dir 0x%x", dir);
831 vap->iv_stats.is_rx_wrongdir++;
834 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
835 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
836 ni->ni_macaddr, "mgt", "too short: len %u",
838 vap->iv_stats.is_rx_tooshort++;
841 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
842 /* ensure return frames are unicast */
843 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
844 wh, NULL, "source is multicast: %s",
845 kether_ntoa(wh->i_addr2, ethstr));
846 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */
849 #ifdef IEEE80211_DEBUG
850 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
851 ieee80211_msg_dumppkts(vap)) {
852 if_printf(ifp, "received %s from %s rssi %d\n",
853 ieee80211_mgt_subtype_name[subtype >>
854 IEEE80211_FC0_SUBTYPE_SHIFT],
855 kether_ntoa(wh->i_addr2, ethstr), rssi);
858 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
859 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
861 * Only shared key auth frames with a challenge
862 * should be encrypted, discard all others.
864 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
866 "%s", "WEP set but not permitted");
867 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
870 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
872 * Discard encrypted frames when privacy is off.
874 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
875 wh, NULL, "%s", "WEP set but PRIVACY off");
876 vap->iv_stats.is_rx_noprivacy++;
879 hdrspace = ieee80211_hdrspace(ic, wh);
880 key = ieee80211_crypto_decap(ni, m, hdrspace);
882 /* NB: stats+msgs handled in crypto_decap */
885 wh = mtod(m, struct ieee80211_frame *);
886 wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
888 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
891 case IEEE80211_FC0_TYPE_CTL:
892 vap->iv_stats.is_rx_ctl++;
893 IEEE80211_NODE_STAT(ni, rx_ctrl);
894 vap->iv_recv_ctl(ni, m, subtype);
897 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
898 wh, "bad", "frame type 0x%x", type);
899 /* should not come here */
906 if (need_tap && ieee80211_radiotap_active_vap(vap))
907 ieee80211_radiotap_rx(vap, m);
915 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
916 int rssi, int nf, uint16_t seq, uint16_t status)
918 struct ieee80211vap *vap = ni->ni_vap;
920 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
922 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
923 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
924 ni->ni_macaddr, "open auth",
925 "bad sta auth mode %u", ni->ni_authmode);
926 vap->iv_stats.is_rx_bad_auth++; /* XXX */
928 * Clear any challenge text that may be there if
929 * a previous shared key auth failed and then an
930 * open auth is attempted.
932 if (ni->ni_challenge != NULL) {
933 kfree(ni->ni_challenge, M_80211_NODE);
934 ni->ni_challenge = NULL;
936 /* XXX hack to workaround calling convention */
937 ieee80211_send_error(ni, wh->i_addr2,
938 IEEE80211_FC0_SUBTYPE_AUTH,
939 (seq + 1) | (IEEE80211_STATUS_ALG<<16));
942 if (seq != IEEE80211_AUTH_OPEN_REQUEST) {
943 vap->iv_stats.is_rx_bad_auth++;
946 /* always accept open authentication requests */
947 if (ni == vap->iv_bss) {
948 ni = ieee80211_dup_bss(vap, wh->i_addr2);
951 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
952 (void) ieee80211_ref_node(ni);
954 * Mark the node as referenced to reflect that it's
955 * reference count has been bumped to insure it remains
956 * after the transaction completes.
958 ni->ni_flags |= IEEE80211_NODE_AREF;
960 * Mark the node as requiring a valid association id
961 * before outbound traffic is permitted.
963 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
965 if (vap->iv_acl != NULL &&
966 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
968 * When the ACL policy is set to RADIUS we defer the
969 * authorization to a user agent. Dispatch an event,
970 * a subsequent MLME call will decide the fate of the
971 * station. If the user agent is not present then the
972 * node will be reclaimed due to inactivity.
974 IEEE80211_NOTE_MAC(vap,
975 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr,
976 "%s", "station authentication defered (radius acl)");
977 ieee80211_notify_node_auth(ni);
979 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
980 IEEE80211_NOTE_MAC(vap,
981 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr,
982 "%s", "station authenticated (open)");
984 * When 802.1x is not in use mark the port
985 * authorized at this point so traffic can flow.
987 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
988 ieee80211_node_authorize(ni);
993 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
994 uint8_t *frm, uint8_t *efrm, int rssi, int nf,
995 uint16_t seq, uint16_t status)
997 struct ieee80211vap *vap = ni->ni_vap;
999 #ifdef IEEE80211_DEBUG
1004 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
1007 * NB: this can happen as we allow pre-shared key
1008 * authentication to be enabled w/o wep being turned
1009 * on so that configuration of these can be done
1010 * in any order. It may be better to enforce the
1011 * ordering in which case this check would just be
1012 * for sanity/consistency.
1014 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1015 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1016 ni->ni_macaddr, "shared key auth",
1017 "%s", " PRIVACY is disabled");
1018 estatus = IEEE80211_STATUS_ALG;
1022 * Pre-shared key authentication is evil; accept
1023 * it only if explicitly configured (it is supported
1024 * mainly for compatibility with clients like Mac OS X).
1026 if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1027 ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1028 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1029 ni->ni_macaddr, "shared key auth",
1030 "bad sta auth mode %u", ni->ni_authmode);
1031 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1032 estatus = IEEE80211_STATUS_ALG;
1037 if (frm + 1 < efrm) {
1038 if ((frm[1] + 2) > (efrm - frm)) {
1039 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1040 ni->ni_macaddr, "shared key auth",
1041 "ie %d/%d too long",
1042 frm[0], (int)((frm[1] + 2) - (efrm - frm)));
1043 vap->iv_stats.is_rx_bad_auth++;
1044 estatus = IEEE80211_STATUS_CHALLENGE;
1047 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1052 case IEEE80211_AUTH_SHARED_CHALLENGE:
1053 case IEEE80211_AUTH_SHARED_RESPONSE:
1054 if (challenge == NULL) {
1055 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1056 ni->ni_macaddr, "shared key auth",
1057 "%s", "no challenge");
1058 vap->iv_stats.is_rx_bad_auth++;
1059 estatus = IEEE80211_STATUS_CHALLENGE;
1062 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1063 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1064 ni->ni_macaddr, "shared key auth",
1065 "bad challenge len %d", challenge[1]);
1066 vap->iv_stats.is_rx_bad_auth++;
1067 estatus = IEEE80211_STATUS_CHALLENGE;
1074 case IEEE80211_AUTH_SHARED_REQUEST:
1075 if (ni == vap->iv_bss) {
1076 ni = ieee80211_dup_bss(vap, wh->i_addr2);
1078 /* NB: no way to return an error */
1081 #ifdef IEEE80211_DEBUG
1085 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
1086 (void) ieee80211_ref_node(ni);
1087 #ifdef IEEE80211_DEBUG
1092 * Mark the node as referenced to reflect that it's
1093 * reference count has been bumped to insure it remains
1094 * after the transaction completes.
1096 ni->ni_flags |= IEEE80211_NODE_AREF;
1098 * Mark the node as requiring a valid associatio id
1099 * before outbound traffic is permitted.
1101 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
1102 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
1104 if (!ieee80211_alloc_challenge(ni)) {
1105 /* NB: don't return error so they rexmit */
1108 get_random_bytes(ni->ni_challenge,
1109 IEEE80211_CHALLENGE_LEN);
1110 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1111 ni, "shared key %sauth request", allocbs ? "" : "re");
1113 * When the ACL policy is set to RADIUS we defer the
1114 * authorization to a user agent. Dispatch an event,
1115 * a subsequent MLME call will decide the fate of the
1116 * station. If the user agent is not present then the
1117 * node will be reclaimed due to inactivity.
1119 if (vap->iv_acl != NULL &&
1120 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
1121 IEEE80211_NOTE_MAC(vap,
1122 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL,
1124 "%s", "station authentication defered (radius acl)");
1125 ieee80211_notify_node_auth(ni);
1129 case IEEE80211_AUTH_SHARED_RESPONSE:
1130 if (ni == vap->iv_bss) {
1131 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1132 ni->ni_macaddr, "shared key response",
1133 "%s", "unknown station");
1134 /* NB: don't send a response */
1137 if (ni->ni_challenge == NULL) {
1138 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1139 ni->ni_macaddr, "shared key response",
1140 "%s", "no challenge recorded");
1141 vap->iv_stats.is_rx_bad_auth++;
1142 estatus = IEEE80211_STATUS_CHALLENGE;
1145 if (memcmp(ni->ni_challenge, &challenge[2],
1146 challenge[1]) != 0) {
1147 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1148 ni->ni_macaddr, "shared key response",
1149 "%s", "challenge mismatch");
1150 vap->iv_stats.is_rx_auth_fail++;
1151 estatus = IEEE80211_STATUS_CHALLENGE;
1154 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1155 ni, "%s", "station authenticated (shared key)");
1156 ieee80211_node_authorize(ni);
1159 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1160 ni->ni_macaddr, "shared key auth",
1162 vap->iv_stats.is_rx_bad_auth++;
1163 estatus = IEEE80211_STATUS_SEQUENCE;
1166 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1170 * Send an error response; but only when operating as an AP.
1172 /* XXX hack to workaround calling convention */
1173 ieee80211_send_error(ni, wh->i_addr2,
1174 IEEE80211_FC0_SUBTYPE_AUTH,
1175 (seq + 1) | (estatus<<16));
1179 * Convert a WPA cipher selector OUI to an internal
1180 * cipher algorithm. Where appropriate we also
1181 * record any key length.
1184 wpa_cipher(const uint8_t *sel, uint8_t *keylen)
1186 #define WPA_SEL(x) (((x)<<24)|WPA_OUI)
1187 uint32_t w = LE_READ_4(sel);
1190 case WPA_SEL(WPA_CSE_NULL):
1191 return IEEE80211_CIPHER_NONE;
1192 case WPA_SEL(WPA_CSE_WEP40):
1194 *keylen = 40 / NBBY;
1195 return IEEE80211_CIPHER_WEP;
1196 case WPA_SEL(WPA_CSE_WEP104):
1198 *keylen = 104 / NBBY;
1199 return IEEE80211_CIPHER_WEP;
1200 case WPA_SEL(WPA_CSE_TKIP):
1201 return IEEE80211_CIPHER_TKIP;
1202 case WPA_SEL(WPA_CSE_CCMP):
1203 return IEEE80211_CIPHER_AES_CCM;
1205 return 32; /* NB: so 1<< is discarded */
1210 * Convert a WPA key management/authentication algorithm
1211 * to an internal code.
1214 wpa_keymgmt(const uint8_t *sel)
1216 #define WPA_SEL(x) (((x)<<24)|WPA_OUI)
1217 uint32_t w = LE_READ_4(sel);
1220 case WPA_SEL(WPA_ASE_8021X_UNSPEC):
1221 return WPA_ASE_8021X_UNSPEC;
1222 case WPA_SEL(WPA_ASE_8021X_PSK):
1223 return WPA_ASE_8021X_PSK;
1224 case WPA_SEL(WPA_ASE_NONE):
1225 return WPA_ASE_NONE;
1227 return 0; /* NB: so is discarded */
1232 * Parse a WPA information element to collect parameters.
1233 * Note that we do not validate security parameters; that
1234 * is handled by the authenticator; the parsing done here
1235 * is just for internal use in making operational decisions.
1238 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm,
1239 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1241 uint8_t len = frm[1];
1246 * Check the length once for fixed parts: OUI, type,
1247 * version, mcast cipher, and 2 selector counts.
1248 * Other, variable-length data, must be checked separately.
1250 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) {
1251 IEEE80211_DISCARD_IE(vap,
1252 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1253 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags);
1254 return IEEE80211_REASON_IE_INVALID;
1257 IEEE80211_DISCARD_IE(vap,
1258 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1259 wh, "WPA", "too short, len %u", len);
1260 return IEEE80211_REASON_IE_INVALID;
1262 frm += 6, len -= 4; /* NB: len is payload only */
1263 /* NB: iswpaoui already validated the OUI and type */
1265 if (w != WPA_VERSION) {
1266 IEEE80211_DISCARD_IE(vap,
1267 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1268 wh, "WPA", "bad version %u", w);
1269 return IEEE80211_REASON_IE_INVALID;
1273 memset(rsn, 0, sizeof(*rsn));
1275 /* multicast/group cipher */
1276 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen);
1279 /* unicast ciphers */
1283 IEEE80211_DISCARD_IE(vap,
1284 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1285 wh, "WPA", "ucast cipher data too short; len %u, n %u",
1287 return IEEE80211_REASON_IE_INVALID;
1290 for (; n > 0; n--) {
1291 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen);
1294 if (w & (1<<IEEE80211_CIPHER_TKIP))
1295 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1297 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1299 /* key management algorithms */
1303 IEEE80211_DISCARD_IE(vap,
1304 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1305 wh, "WPA", "key mgmt alg data too short; len %u, n %u",
1307 return IEEE80211_REASON_IE_INVALID;
1310 for (; n > 0; n--) {
1311 w |= wpa_keymgmt(frm);
1314 if (w & WPA_ASE_8021X_UNSPEC)
1315 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC;
1317 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
1319 if (len > 2) /* optional capabilities */
1320 rsn->rsn_caps = LE_READ_2(frm);
1326 * Convert an RSN cipher selector OUI to an internal
1327 * cipher algorithm. Where appropriate we also
1328 * record any key length.
1331 rsn_cipher(const uint8_t *sel, uint8_t *keylen)
1333 #define RSN_SEL(x) (((x)<<24)|RSN_OUI)
1334 uint32_t w = LE_READ_4(sel);
1337 case RSN_SEL(RSN_CSE_NULL):
1338 return IEEE80211_CIPHER_NONE;
1339 case RSN_SEL(RSN_CSE_WEP40):
1341 *keylen = 40 / NBBY;
1342 return IEEE80211_CIPHER_WEP;
1343 case RSN_SEL(RSN_CSE_WEP104):
1345 *keylen = 104 / NBBY;
1346 return IEEE80211_CIPHER_WEP;
1347 case RSN_SEL(RSN_CSE_TKIP):
1348 return IEEE80211_CIPHER_TKIP;
1349 case RSN_SEL(RSN_CSE_CCMP):
1350 return IEEE80211_CIPHER_AES_CCM;
1351 case RSN_SEL(RSN_CSE_WRAP):
1352 return IEEE80211_CIPHER_AES_OCB;
1354 return 32; /* NB: so 1<< is discarded */
1359 * Convert an RSN key management/authentication algorithm
1360 * to an internal code.
1363 rsn_keymgmt(const uint8_t *sel)
1365 #define RSN_SEL(x) (((x)<<24)|RSN_OUI)
1366 uint32_t w = LE_READ_4(sel);
1369 case RSN_SEL(RSN_ASE_8021X_UNSPEC):
1370 return RSN_ASE_8021X_UNSPEC;
1371 case RSN_SEL(RSN_ASE_8021X_PSK):
1372 return RSN_ASE_8021X_PSK;
1373 case RSN_SEL(RSN_ASE_NONE):
1374 return RSN_ASE_NONE;
1376 return 0; /* NB: so is discarded */
1381 * Parse a WPA/RSN information element to collect parameters
1382 * and validate the parameters against what has been
1383 * configured for the system.
1386 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm,
1387 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1389 uint8_t len = frm[1];
1394 * Check the length once for fixed parts:
1395 * version, mcast cipher, and 2 selector counts.
1396 * Other, variable-length data, must be checked separately.
1398 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) {
1399 IEEE80211_DISCARD_IE(vap,
1400 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1401 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags);
1402 return IEEE80211_REASON_IE_INVALID;
1405 IEEE80211_DISCARD_IE(vap,
1406 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1407 wh, "RSN", "too short, len %u", len);
1408 return IEEE80211_REASON_IE_INVALID;
1412 if (w != RSN_VERSION) {
1413 IEEE80211_DISCARD_IE(vap,
1414 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1415 wh, "RSN", "bad version %u", w);
1416 return IEEE80211_REASON_IE_INVALID;
1420 memset(rsn, 0, sizeof(*rsn));
1422 /* multicast/group cipher */
1423 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen);
1426 /* unicast ciphers */
1430 IEEE80211_DISCARD_IE(vap,
1431 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1432 wh, "RSN", "ucast cipher data too short; len %u, n %u",
1434 return IEEE80211_REASON_IE_INVALID;
1437 for (; n > 0; n--) {
1438 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen);
1441 if (w & (1<<IEEE80211_CIPHER_TKIP))
1442 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1444 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1446 /* key management algorithms */
1450 IEEE80211_DISCARD_IE(vap,
1451 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1452 wh, "RSN", "key mgmt alg data too short; len %u, n %u",
1454 return IEEE80211_REASON_IE_INVALID;
1457 for (; n > 0; n--) {
1458 w |= rsn_keymgmt(frm);
1461 if (w & RSN_ASE_8021X_UNSPEC)
1462 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC;
1464 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK;
1466 /* optional RSN capabilities */
1468 rsn->rsn_caps = LE_READ_2(frm);
1475 * WPA/802.11i assocation request processing.
1478 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms,
1479 const struct ieee80211_frame *wh, const uint8_t *wpa,
1480 const uint8_t *rsn, uint16_t capinfo)
1482 struct ieee80211vap *vap = ni->ni_vap;
1486 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN);
1487 if (wpa == NULL && rsn == NULL) {
1488 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) {
1490 * W-Fi Protected Setup (WPS) permits
1491 * clients to associate and pass EAPOL frames
1492 * to establish initial credentials.
1494 ni->ni_flags |= IEEE80211_NODE_WPS;
1497 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) &&
1498 (capinfo & IEEE80211_CAPINFO_PRIVACY)) {
1500 * Transitional Security Network. Permits clients
1501 * to associate and use WEP while WPA is configured.
1503 ni->ni_flags |= IEEE80211_NODE_TSN;
1506 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1507 wh, NULL, "%s", "no WPA/RSN IE in association request");
1508 vap->iv_stats.is_rx_assoc_badwpaie++;
1509 reason = IEEE80211_REASON_IE_INVALID;
1512 /* assert right association security credentials */
1513 badwparsn = 0; /* NB: to silence compiler */
1514 switch (vap->iv_flags & IEEE80211_F_WPA) {
1515 case IEEE80211_F_WPA1:
1516 badwparsn = (wpa == NULL);
1518 case IEEE80211_F_WPA2:
1519 badwparsn = (rsn == NULL);
1521 case IEEE80211_F_WPA1|IEEE80211_F_WPA2:
1522 badwparsn = (wpa == NULL && rsn == NULL);
1526 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1528 "%s", "missing WPA/RSN IE in association request");
1529 vap->iv_stats.is_rx_assoc_badwpaie++;
1530 reason = IEEE80211_REASON_IE_INVALID;
1534 * Parse WPA/RSN information element.
1537 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh);
1539 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh);
1541 /* XXX distinguish WPA/RSN? */
1542 vap->iv_stats.is_rx_assoc_badwpaie++;
1545 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni,
1546 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x",
1547 wpa != NULL ? "WPA" : "RSN",
1548 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen,
1549 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen,
1550 rsnparms->rsn_keymgmt, rsnparms->rsn_caps);
1554 ieee80211_node_deauth(ni, reason);
1558 /* XXX find a better place for definition */
1559 struct l2_update_frame {
1560 struct ether_header eh;
1568 * Deliver a TGf L2UF frame on behalf of a station.
1569 * This primes any bridge when the station is roaming
1570 * between ap's on the same wired network.
1573 ieee80211_deliver_l2uf(struct ieee80211_node *ni)
1575 struct ieee80211vap *vap = ni->ni_vap;
1576 struct ifnet *ifp = vap->iv_ifp;
1578 struct l2_update_frame *l2uf;
1579 struct ether_header *eh;
1581 m = m_gethdr(MB_DONTWAIT, MT_DATA);
1583 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1584 "%s", "no mbuf for l2uf frame");
1585 vap->iv_stats.is_rx_nobuf++; /* XXX not right */
1588 l2uf = mtod(m, struct l2_update_frame *);
1590 /* dst: Broadcast address */
1591 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr);
1592 /* src: associated STA */
1593 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr);
1594 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh));
1598 l2uf->control = 0xf5;
1599 l2uf->xid[0] = 0x81;
1600 l2uf->xid[1] = 0x80;
1601 l2uf->xid[2] = 0x00;
1603 m->m_pkthdr.len = m->m_len = sizeof(*l2uf);
1604 hostap_deliver_data(vap, ni, m);
1608 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1609 int reassoc, int resp, const char *tag, int rate)
1611 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1612 "deny %s request, %s rate set mismatch, rate/MCS %d",
1613 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL);
1614 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE);
1615 ieee80211_node_leave(ni);
1619 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1620 int reassoc, int resp, const char *tag, int capinfo)
1622 struct ieee80211vap *vap = ni->ni_vap;
1624 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1625 "deny %s request, %s mismatch 0x%x",
1626 reassoc ? "reassoc" : "assoc", tag, capinfo);
1627 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO);
1628 ieee80211_node_leave(ni);
1629 vap->iv_stats.is_rx_assoc_capmismatch++;
1633 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1634 int reassoc, int resp)
1636 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1637 "deny %s request, missing HT ie", reassoc ? "reassoc" : "assoc");
1638 /* XXX no better code */
1639 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS);
1640 ieee80211_node_leave(ni);
1644 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1645 int algo, int seq, int status)
1647 struct ieee80211vap *vap = ni->ni_vap;
1649 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1650 wh, NULL, "unsupported alg %d", algo);
1651 vap->iv_stats.is_rx_auth_unsupported++;
1652 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH,
1653 seq | (status << 16));
1657 ishtmixed(const uint8_t *ie)
1659 const struct ieee80211_ie_htinfo *ht =
1660 (const struct ieee80211_ie_htinfo *) ie;
1661 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) ==
1662 IEEE80211_HTINFO_OPMODE_MIXED;
1666 is11bclient(const uint8_t *rates, const uint8_t *xrates)
1668 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
1671 /* NB: the 11b clients we care about will not have xrates */
1672 if (xrates != NULL || rates == NULL)
1674 for (i = 0; i < rates[1]; i++) {
1675 int r = rates[2+i] & IEEE80211_RATE_VAL;
1676 if (r > 2*11 || ((1<<r) & brates) == 0)
1683 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1684 int subtype, int rssi, int nf)
1686 struct ieee80211vap *vap = ni->ni_vap;
1687 struct ieee80211com *ic = ni->ni_ic;
1688 struct ieee80211_frame *wh;
1689 uint8_t *frm, *efrm, *sfrm;
1690 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap;
1694 wh = mtod(m0, struct ieee80211_frame *);
1695 frm = (uint8_t *)&wh[1];
1696 efrm = mtod(m0, uint8_t *) + m0->m_len;
1698 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1699 case IEEE80211_FC0_SUBTYPE_BEACON: {
1700 struct ieee80211_scanparams scan;
1702 * We process beacon/probe response frames when scanning;
1703 * otherwise we check beacon frames for overlapping non-ERP
1704 * BSS in 11g and/or overlapping legacy BSS when in HT.
1706 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 &&
1707 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) {
1708 vap->iv_stats.is_rx_mgtdiscard++;
1711 /* NB: accept off-channel frames */
1712 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN)
1715 * Count frame now that we know it's to be processed.
1717 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1718 vap->iv_stats.is_rx_beacon++; /* XXX remove */
1719 IEEE80211_NODE_STAT(ni, rx_beacons);
1721 IEEE80211_NODE_STAT(ni, rx_proberesp);
1723 * If scanning, just pass information to the scan module.
1725 if (ic->ic_flags & IEEE80211_F_SCAN) {
1726 if (scan.status == 0 && /* NB: on channel */
1727 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) {
1729 * Actively scanning a channel marked passive;
1730 * send a probe request now that we know there
1731 * is 802.11 traffic present.
1733 * XXX check if the beacon we recv'd gives
1734 * us what we need and suppress the probe req
1736 ieee80211_probe_curchan(vap, 1);
1737 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1739 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
1743 * Check beacon for overlapping bss w/ non ERP stations.
1744 * If we detect one and protection is configured but not
1745 * enabled, enable it and start a timer that'll bring us
1746 * out if we stop seeing the bss.
1748 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1749 scan.status == 0 && /* NB: on-channel */
1750 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/
1751 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) {
1752 ic->ic_lastnonerp = ticks;
1753 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR;
1754 if (ic->ic_protmode != IEEE80211_PROT_NONE &&
1755 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) {
1756 IEEE80211_NOTE_FRAME(vap,
1757 IEEE80211_MSG_ASSOC, wh,
1758 "non-ERP present on channel %d "
1759 "(saw erp 0x%x from channel %d), "
1760 "enable use of protection",
1761 ic->ic_curchan->ic_ieee,
1762 scan.erp, scan.chan);
1763 ic->ic_flags |= IEEE80211_F_USEPROT;
1764 ieee80211_notify_erp(ic);
1768 * Check beacon for non-HT station on HT channel
1769 * and update HT BSS occupancy as appropriate.
1771 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) {
1772 if (scan.status & IEEE80211_BPARSE_OFFCHAN) {
1774 * Off control channel; only check frames
1775 * that come in the extension channel when
1776 * operating w/ HT40.
1778 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan))
1780 if (scan.chan != ic->ic_curchan->ic_extieee)
1783 if (scan.htinfo == NULL) {
1784 ieee80211_htprot_update(ic,
1785 IEEE80211_HTINFO_OPMODE_PROTOPT |
1786 IEEE80211_HTINFO_NONHT_PRESENT);
1787 } else if (ishtmixed(scan.htinfo)) {
1788 /* XXX? take NONHT_PRESENT from beacon? */
1789 ieee80211_htprot_update(ic,
1790 IEEE80211_HTINFO_OPMODE_MIXED |
1791 IEEE80211_HTINFO_NONHT_PRESENT);
1797 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1798 if (vap->iv_state != IEEE80211_S_RUN) {
1799 vap->iv_stats.is_rx_mgtdiscard++;
1803 * prreq frame format
1805 * [tlv] supported rates
1806 * [tlv] extended supported rates
1808 ssid = rates = xrates = NULL;
1810 while (efrm - frm > 1) {
1811 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1813 case IEEE80211_ELEMID_SSID:
1816 case IEEE80211_ELEMID_RATES:
1819 case IEEE80211_ELEMID_XRATES:
1825 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1827 IEEE80211_VERIFY_ELEMENT(xrates,
1828 IEEE80211_RATE_MAXSIZE - rates[1], return);
1829 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
1830 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
1831 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
1832 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1834 "%s", "no ssid with ssid suppression enabled");
1835 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
1839 /* XXX find a better class or define it's own */
1840 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
1841 "%s", "recv probe req");
1843 * Some legacy 11b clients cannot hack a complete
1844 * probe response frame. When the request includes
1845 * only a bare-bones rate set, communicate this to
1846 * the transmit side.
1848 ieee80211_send_proberesp(vap, wh->i_addr2,
1849 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
1852 case IEEE80211_FC0_SUBTYPE_AUTH: {
1853 uint16_t algo, seq, status;
1855 if (vap->iv_state != IEEE80211_S_RUN) {
1856 vap->iv_stats.is_rx_mgtdiscard++;
1859 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1860 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1861 wh, NULL, "%s", "wrong bssid");
1862 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/
1872 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1873 algo = le16toh(*(uint16_t *)frm);
1874 seq = le16toh(*(uint16_t *)(frm + 2));
1875 status = le16toh(*(uint16_t *)(frm + 4));
1876 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1877 "recv auth frame with algorithm %d seq %d", algo, seq);
1879 * Consult the ACL policy module if setup.
1881 if (vap->iv_acl != NULL &&
1882 !vap->iv_acl->iac_check(vap, wh->i_addr2)) {
1883 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1884 wh, NULL, "%s", "disallowed by ACL");
1885 vap->iv_stats.is_rx_acl++;
1886 ieee80211_send_error(ni, wh->i_addr2,
1887 IEEE80211_FC0_SUBTYPE_AUTH,
1888 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16));
1891 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1892 IEEE80211_DISCARD(vap,
1893 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1894 wh, NULL, "%s", "TKIP countermeasures enabled");
1895 vap->iv_stats.is_rx_auth_countermeasures++;
1896 ieee80211_send_error(ni, wh->i_addr2,
1897 IEEE80211_FC0_SUBTYPE_AUTH,
1898 IEEE80211_REASON_MIC_FAILURE);
1901 if (algo == IEEE80211_AUTH_ALG_SHARED)
1902 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1904 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1905 hostap_auth_open(ni, wh, rssi, nf, seq, status);
1906 else if (algo == IEEE80211_AUTH_ALG_LEAP) {
1907 authalgreject(ni, wh, algo,
1908 seq+1, IEEE80211_STATUS_ALG);
1912 * We assume that an unknown algorithm is the result
1913 * of a decryption failure on a shared key auth frame;
1914 * return a status code appropriate for that instead
1915 * of IEEE80211_STATUS_ALG.
1917 * NB: a seq# of 4 is intentional; the decrypted
1918 * frame likely has a bogus seq value.
1920 authalgreject(ni, wh, algo,
1921 4, IEEE80211_STATUS_CHALLENGE);
1927 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1928 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
1929 uint16_t capinfo, lintval;
1930 struct ieee80211_rsnparms rsnparms;
1932 if (vap->iv_state != IEEE80211_S_RUN) {
1933 vap->iv_stats.is_rx_mgtdiscard++;
1936 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1937 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1938 wh, NULL, "%s", "wrong bssid");
1939 vap->iv_stats.is_rx_assoc_bss++;
1942 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
1944 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
1947 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
1949 if (ni == vap->iv_bss) {
1950 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1951 "deny %s request, sta not authenticated",
1952 reassoc ? "reassoc" : "assoc");
1953 ieee80211_send_error(ni, wh->i_addr2,
1954 IEEE80211_FC0_SUBTYPE_DEAUTH,
1955 IEEE80211_REASON_ASSOC_NOT_AUTHED);
1956 vap->iv_stats.is_rx_assoc_notauth++;
1961 * asreq frame format
1962 * [2] capability information
1963 * [2] listen interval
1964 * [6*] current AP address (reassoc only)
1966 * [tlv] supported rates
1967 * [tlv] extended supported rates
1969 * [tlv] HT capabilities
1970 * [tlv] Atheros capabilities
1972 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return);
1973 capinfo = le16toh(*(uint16_t *)frm); frm += 2;
1974 lintval = le16toh(*(uint16_t *)frm); frm += 2;
1976 frm += 6; /* ignore current AP info */
1977 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL;
1979 while (efrm - frm > 1) {
1980 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1982 case IEEE80211_ELEMID_SSID:
1985 case IEEE80211_ELEMID_RATES:
1988 case IEEE80211_ELEMID_XRATES:
1991 case IEEE80211_ELEMID_RSN:
1994 case IEEE80211_ELEMID_HTCAP:
1997 case IEEE80211_ELEMID_VENDOR:
2000 else if (iswmeinfo(frm))
2002 #ifdef IEEE80211_SUPPORT_SUPERG
2003 else if (isatherosoui(frm))
2006 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
2007 if (ishtcapoui(frm) && htcap == NULL)
2014 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
2016 IEEE80211_VERIFY_ELEMENT(xrates,
2017 IEEE80211_RATE_MAXSIZE - rates[1], return);
2018 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
2019 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
2020 if (htcap != NULL) {
2021 IEEE80211_VERIFY_LENGTH(htcap[1],
2022 htcap[0] == IEEE80211_ELEMID_VENDOR ?
2023 4 + sizeof(struct ieee80211_ie_htcap)-2 :
2024 sizeof(struct ieee80211_ie_htcap)-2,
2025 return); /* XXX just NULL out? */
2028 if ((vap->iv_flags & IEEE80211_F_WPA) &&
2029 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo))
2031 /* discard challenge after association */
2032 if (ni->ni_challenge != NULL) {
2033 kfree(ni->ni_challenge, M_80211_NODE);
2034 ni->ni_challenge = NULL;
2036 /* NB: 802.11 spec says to ignore station's privacy bit */
2037 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
2038 capinfomismatch(ni, wh, reassoc, resp,
2039 "capability", capinfo);
2043 * Disallow re-associate w/ invalid slot time setting.
2045 if (ni->ni_associd != 0 &&
2046 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2047 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
2048 capinfomismatch(ni, wh, reassoc, resp,
2049 "slot time", capinfo);
2052 rate = ieee80211_setup_rates(ni, rates, xrates,
2053 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
2054 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
2055 if (rate & IEEE80211_RATE_BASIC) {
2056 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate);
2057 vap->iv_stats.is_rx_assoc_norate++;
2061 * If constrained to 11g-only stations reject an
2062 * 11b-only station. We cheat a bit here by looking
2063 * at the max negotiated xmit rate and assuming anyone
2064 * with a best rate <24Mb/s is an 11b station.
2066 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) {
2067 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate);
2068 vap->iv_stats.is_rx_assoc_norate++;
2072 * Do HT rate set handling and setup HT node state.
2074 ni->ni_chan = vap->iv_bss->ni_chan;
2075 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2076 rate = ieee80211_setup_htrates(ni, htcap,
2077 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO |
2079 if (rate & IEEE80211_RATE_BASIC) {
2080 ratesetmismatch(ni, wh, reassoc, resp,
2082 vap->iv_stats.is_ht_assoc_norate++;
2085 ieee80211_ht_node_init(ni);
2086 ieee80211_ht_updatehtcap(ni, htcap);
2087 } else if (ni->ni_flags & IEEE80211_NODE_HT)
2088 ieee80211_ht_node_cleanup(ni);
2089 #ifdef IEEE80211_SUPPORT_SUPERG
2090 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH)
2091 ieee80211_ff_node_cleanup(ni);
2094 * Allow AMPDU operation only with unencrypted traffic
2095 * or AES-CCM; the 11n spec only specifies these ciphers
2096 * so permitting any others is undefined and can lead
2097 * to interoperability problems.
2099 if ((ni->ni_flags & IEEE80211_NODE_HT) &&
2100 (((vap->iv_flags & IEEE80211_F_WPA) &&
2101 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) ||
2102 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) {
2104 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
2105 "disallow HT use because WEP or TKIP requested, "
2106 "capinfo 0x%x ucastcipher %d", capinfo,
2107 rsnparms.rsn_ucastcipher);
2108 ieee80211_ht_node_cleanup(ni);
2109 vap->iv_stats.is_ht_assoc_downgrade++;
2112 * If constrained to 11n-only stations reject legacy stations.
2114 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) &&
2115 (ni->ni_flags & IEEE80211_NODE_HT) == 0) {
2116 htcapmismatch(ni, wh, reassoc, resp);
2117 vap->iv_stats.is_ht_assoc_nohtcap++;
2120 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
2122 ni->ni_intval = lintval;
2123 ni->ni_capinfo = capinfo;
2124 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell;
2125 ni->ni_fhindex = vap->iv_bss->ni_fhindex;
2128 * XXX maybe better to just expand
2130 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) {
2131 #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off)
2133 setie(wpa_ie, wpa - sfrm);
2135 setie(rsn_ie, rsn - sfrm);
2137 setie(htcap_ie, htcap - sfrm);
2139 setie(wme_ie, wme - sfrm);
2141 * Mark node as capable of QoS.
2143 ni->ni_flags |= IEEE80211_NODE_QOS;
2145 ni->ni_flags &= ~IEEE80211_NODE_QOS;
2146 #ifdef IEEE80211_SUPPORT_SUPERG
2148 setie(ath_ie, ath - sfrm);
2150 * Parse ATH station parameters.
2152 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
2155 ni->ni_ath_flags = 0;
2158 ni->ni_flags &= ~IEEE80211_NODE_QOS;
2159 ni->ni_ath_flags = 0;
2161 ieee80211_node_join(ni, resp);
2162 ieee80211_deliver_l2uf(ni);
2166 case IEEE80211_FC0_SUBTYPE_DEAUTH:
2167 case IEEE80211_FC0_SUBTYPE_DISASSOC: {
2168 #ifdef IEEE80211_DEBUG
2172 if (vap->iv_state != IEEE80211_S_RUN ||
2173 /* NB: can happen when in promiscuous mode */
2174 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
2175 vap->iv_stats.is_rx_mgtdiscard++;
2179 * deauth/disassoc frame format
2182 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
2183 #ifdef IEEE80211_DEBUG
2184 reason = le16toh(*(uint16_t *)frm);
2186 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) {
2187 vap->iv_stats.is_rx_deauth++;
2188 IEEE80211_NODE_STAT(ni, rx_deauth);
2190 vap->iv_stats.is_rx_disassoc++;
2191 IEEE80211_NODE_STAT(ni, rx_disassoc);
2193 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2194 "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >>
2195 IEEE80211_FC0_SUBTYPE_SHIFT], reason);
2196 if (ni != vap->iv_bss)
2197 ieee80211_node_leave(ni);
2201 case IEEE80211_FC0_SUBTYPE_ACTION:
2202 if (vap->iv_state == IEEE80211_S_RUN) {
2203 if (ieee80211_parse_action(ni, m0) == 0)
2204 ic->ic_recv_action(ni, wh, frm, efrm);
2206 vap->iv_stats.is_rx_mgtdiscard++;
2209 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2210 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2212 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2213 wh, "mgt", "subtype 0x%x not handled", subtype);
2214 vap->iv_stats.is_rx_badsubtype++;
2220 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
2223 case IEEE80211_FC0_SUBTYPE_PS_POLL:
2224 hostap_recv_pspoll(ni, m);
2226 case IEEE80211_FC0_SUBTYPE_BAR:
2227 ieee80211_recv_bar(ni, m);
2233 * Process a received ps-poll frame.
2236 hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
2238 struct ieee80211vap *vap = ni->ni_vap;
2239 struct ieee80211_frame_min *wh;
2241 struct ifaltq_subque *ifsq;
2246 wh = mtod(m0, struct ieee80211_frame_min *);
2247 if (ni->ni_associd == 0) {
2248 IEEE80211_DISCARD(vap,
2249 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2250 (struct ieee80211_frame *) wh, NULL,
2251 "%s", "unassociated station");
2252 vap->iv_stats.is_ps_unassoc++;
2253 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
2254 IEEE80211_REASON_NOT_ASSOCED);
2258 aid = le16toh(*(uint16_t *)wh->i_dur);
2259 if (aid != ni->ni_associd) {
2260 IEEE80211_DISCARD(vap,
2261 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2262 (struct ieee80211_frame *) wh, NULL,
2263 "aid mismatch: sta aid 0x%x poll aid 0x%x",
2264 ni->ni_associd, aid);
2265 vap->iv_stats.is_ps_badaid++;
2267 * NB: We used to deauth the station but it turns out
2268 * the Blackberry Curve 8230 (and perhaps other devices)
2269 * sometimes send the wrong AID when WME is negotiated.
2270 * Being more lenient here seems ok as we already check
2271 * the station is associated and we only return frames
2272 * queued for the station (i.e. we don't use the AID).
2277 /* Okay, take the first queued packet and put it out... */
2278 m = ieee80211_node_psq_dequeue(ni, &qlen);
2280 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2,
2281 "%s", "recv ps-poll, but queue empty");
2282 ieee80211_send_nulldata(ieee80211_ref_node(ni));
2283 vap->iv_stats.is_ps_qempty++; /* XXX node stat */
2284 if (vap->iv_set_tim != NULL)
2285 vap->iv_set_tim(ni, 0); /* just in case */
2289 * If there are more packets, set the more packets bit
2290 * in the packet dispatched to the station; otherwise
2291 * turn off the TIM bit.
2294 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2295 "recv ps-poll, send packet, %u still queued", qlen);
2296 m->m_flags |= M_MORE_DATA;
2298 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2299 "%s", "recv ps-poll, send packet, queue empty");
2300 if (vap->iv_set_tim != NULL)
2301 vap->iv_set_tim(ni, 0);
2303 m->m_flags |= M_PWR_SAV; /* bypass PS handling */
2305 if (m->m_flags & M_ENCAP)
2306 ifp = vap->iv_ic->ic_ifp;
2310 ifsq = ifq_get_subq_default(&ifp->if_snd);
2311 ifsq_enqueue(ifsq, m, NULL);
2312 ifp->if_start(ifp, ifsq);