text: /*-
   * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   * $FreeBSD: head/sys/net80211/ieee80211_wds.c 203422 2010-02-03 10:07:43Z rpaulo $
   */
  
  /*
   * IEEE 802.11 WDS mode support.
   */
  #include "opt_inet.h"
  #include "opt_wlan.h"
  
  #include <sys/param.h>
  #include <sys/systm.h> 
  #include <sys/mbuf.h>   
  #include <sys/malloc.h>
  #include <sys/kernel.h>
  
  #include <sys/socket.h>
  #include <sys/sockio.h>
  #include <sys/endian.h>
  #include <sys/errno.h>
  #include <sys/proc.h>
  #include <sys/sysctl.h>
  
  #include <net/if.h>
  #include <net/if_media.h>
  #include <net/if_llc.h>
  #include <net/ethernet.h>
  #include <net/route.h>
  
  #include <net/bpf.h>
  
  #include <netproto/802_11/ieee80211_var.h>
  #include <netproto/802_11/ieee80211_wds.h>
  #include <netproto/802_11/ieee80211_input.h>
  #ifdef IEEE80211_SUPPORT_SUPERG
  #include <netproto/802_11/ieee80211_superg.h>
  #endif
  
  static void wds_vattach(struct ieee80211vap *);
  static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  static	int wds_input(struct ieee80211_node *ni, struct mbuf *m, int, int);
  static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  	    int subtype, int, int);
  
  void
  ieee80211_wds_attach(struct ieee80211com *ic)
  {
  	ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach;
  }
  
  void
  ieee80211_wds_detach(struct ieee80211com *ic)
  {
  }
  
  static void
  wds_vdetach(struct ieee80211vap *vap)
  {
  	if (vap->iv_bss != NULL) {
  		/* XXX locking? */
  		if (vap->iv_bss->ni_wdsvap == vap)
  			vap->iv_bss->ni_wdsvap = NULL;
  	}
  }
  
  static void
  wds_vattach(struct ieee80211vap *vap)
  {
  	vap->iv_newstate = wds_newstate;
  	vap->iv_input = wds_input;
  	vap->iv_recv_mgmt = wds_recv_mgmt;
  	vap->iv_opdetach = wds_vdetach;
  }
  
  static void
  wds_flush(struct ieee80211_node *ni)
  {
  	struct ieee80211com *ic = ni->ni_ic;
  	struct mbuf *m, *next;
  	int8_t rssi, nf;
  
  	m = ieee80211_ageq_remove(&ic->ic_stageq,
  	    (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr));
  	if (m == NULL)
  		return;
  
  	IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni,
  	    "%s", "flush wds queue");
  	ic->ic_node_getsignal(ni, &rssi, &nf);
  	for (; m != NULL; m = next) {
  		next = m->m_nextpkt;
  		m->m_nextpkt = NULL;
  		ieee80211_input(ni, m, rssi, nf);
  	}
  }
  
  static int
  ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan)
  {
  	struct ieee80211com *ic = vap->iv_ic;
  /*	struct ieee80211_node_table *nt = &ic->ic_sta;*/
  	struct ieee80211_node *ni, *obss;
  
  	IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
  	     "%s: creating link to %6D on channel %u\n", __func__,
  	     vap->iv_des_bssid, ":", ieee80211_chan2ieee(ic, chan));
  
  	/* NB: vap create must specify the bssid for the link */
  	KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid"));
  	/* NB: we should only be called on RUN transition */
  	KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state"));
  
  	if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
  		/*
  		 * Dynamic/non-legacy WDS.  Reference the associated
  		 * station specified by the desired bssid setup at vap
  		 * create.  Point ni_wdsvap at the WDS vap so 4-address
  		 * frames received through the associated AP vap will
  		 * be dispatched upward (e.g. to a bridge) as though
  		 * they arrived on the WDS vap.
  		 */
  		obss = NULL;
  		ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid);
  		if (ni == NULL) {
  			/*
  			 * Node went away before we could hookup.  This
  			 * should be ok; no traffic will flow and a leave
  			 * event will be dispatched that should cause
  			 * the vap to be destroyed.
  			 */
  			IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
  			    "%s: station %6D went away\n",
  			    __func__, vap->iv_des_bssid, ":");
  			/* XXX stat? */
  		} else if (ni->ni_wdsvap != NULL) {
  			/*
  			 * Node already setup with a WDS vap; we cannot
  			 * allow multiple references so disallow.  If
  			 * ni_wdsvap points at us that's ok; we should
  			 * do nothing anyway.
  			 */
  			/* XXX printf instead? */
  			IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
  			    "%s: station %6D in use with %s\n",
  			    __func__, vap->iv_des_bssid, ":",
  			    ni->ni_wdsvap->iv_ifp->if_xname);
  			/* XXX stat? */
  		} else {
  			/*
  			 * Committed to new node, setup state.
  			 */
  			obss = vap->iv_bss;
  			vap->iv_bss = ni;
  			ni->ni_wdsvap = vap;
  		}
  		if (obss != NULL) {
  			/* NB: deferred to avoid recursive lock */
  			ieee80211_free_node(obss);
  		}
  	} else {
  		/*
  		 * Legacy WDS vap setup.
  		 */
  		/*
  		 * The far end does not associate so we just create
  		 * create a new node and install it as the vap's
  		 * bss node.  We must simulate an association and
  		 * authorize the port for traffic to flow.
  		 * XXX check if node already in sta table?
  		 */
  		ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan);
  		if (ni != NULL) {
  			obss = vap->iv_bss;
  			vap->iv_bss = ieee80211_ref_node(ni);
  			ni->ni_flags |= IEEE80211_NODE_AREF;
  			if (obss != NULL)
  				ieee80211_free_node(obss);
  			/* give driver a chance to setup state like ni_txrate */
  			if (ic->ic_newassoc != NULL)
  				ic->ic_newassoc(ni, 1);
  			/* tell the authenticator about new station */
  			if (vap->iv_auth->ia_node_join != NULL)
  				vap->iv_auth->ia_node_join(ni);
  			if (ni->ni_authmode != IEEE80211_AUTH_8021X)
  				ieee80211_node_authorize(ni);
  
  			ieee80211_notify_node_join(ni, 1 /*newassoc*/);
  			/* XXX inject l2uf frame */
  		}
  	}
  
  	/*
  	 * Flush any pending frames now that were setup.
  	 */
  	if (ni != NULL)
  		wds_flush(ni);
  	return (ni == NULL ? ENOENT : 0);
  }
  
  /*
   * Propagate multicast frames of an ap vap to all DWDS links.
   * The caller is assumed to have verified this frame is multicast.
   */
  void
  ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m)
  {
  	struct ieee80211com *ic = vap0->iv_ic;
  	struct ifnet *parent = ic->ic_ifp;
  	const struct ether_header *eh = mtod(m, const struct ether_header *);
  	struct ieee80211_node *ni;
  	struct ieee80211vap *vap;
  	struct ifnet *ifp;
  	struct mbuf *mcopy;
  	int err;
  
  	KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost),
  	    ("%6D not mcast", eh->ether_dhost, ":"));
  
  	/* XXX locking */
  	TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
  		/* only DWDS vaps are interesting */
  		if (vap->iv_opmode != IEEE80211_M_WDS ||
  		    (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))
  			continue;
  		/* if it came in this interface, don't send it back out */
  		ifp = vap->iv_ifp;
  		if (ifp == m->m_pkthdr.rcvif)
  			continue;
  		/*
  		 * Duplicate the frame and send it.
  		 */
  		mcopy = m_copypacket(m, MB_DONTWAIT);
  		if (mcopy == NULL) {
  			ifp->if_oerrors++;
  			/* XXX stat + msg */
  			continue;
  		}
  		ni = ieee80211_find_txnode(vap, eh->ether_dhost);
  		if (ni == NULL) {
  			/* NB: ieee80211_find_txnode does stat+msg */
  			ifp->if_oerrors++;
  			m_freem(mcopy);
  			continue;
  		}
  		/* calculate priority so drivers can find the tx queue */
  		if (ieee80211_classify(ni, mcopy)) {
  			IEEE80211_DISCARD_MAC(vap,
  			    IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS,
  			    eh->ether_dhost, NULL,
  			    "%s", "classification failure");
  			vap->iv_stats.is_tx_classify++;
  			ifp->if_oerrors++;
  			m_freem(mcopy);
  			ieee80211_free_node(ni);
  			continue;
  		}
  
  		BPF_MTAP(ifp, m);		/* 802.3 tx */
  
  		/*
  		 * Encapsulate the packet in prep for transmission.
  		 */
  		mcopy = ieee80211_encap(vap, ni, mcopy);
  		if (mcopy == NULL) {
  			/* NB: stat+msg handled in ieee80211_encap */
  			ieee80211_free_node(ni);
  			continue;
  		}
  		mcopy->m_flags |= M_MCAST;
  		mcopy->m_pkthdr.rcvif = (void *) ni;
  
  		err = ieee80211_handoff(parent, mcopy);
  		if (err) {
  			/* NB: IFQ_HANDOFF reclaims mbuf */
  			ifp->if_oerrors++;
  			ieee80211_free_node(ni);
  		} else
  			ifp->if_opackets++;
  	}
  }
  
  /*
   * Handle DWDS discovery on receipt of a 4-address frame in
   * ap mode.  Queue the frame and post an event for someone
   * to plumb the necessary WDS vap for this station.  Frames
   * received prior to the vap set running will then be reprocessed
   * as if they were just received.
   */
  void
  ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m)
  {
  	struct ieee80211com *ic = ni->ni_ic;
  
  	/*
  	 * Save the frame with an aging interval 4 times
  	 * the listen interval specified by the station. 
  	 * Frames that sit around too long are reclaimed
  	 * using this information.
  	 * XXX handle overflow?
  	 * XXX per/vap beacon interval?
  	 */
  	m->m_pkthdr.rcvif = (void *)(uintptr_t)
  	    ieee80211_mac_hash(ic, ni->ni_macaddr);
  	(void) ieee80211_ageq_append(&ic->ic_stageq, m,
  	    ((ni->ni_intval * ic->ic_lintval) << 2) / 1024);
  	ieee80211_notify_wds_discover(ni);
  }
  
  /*
   * IEEE80211_M_WDS vap state machine handler.
   */
  static int
  wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
  {
  	struct ieee80211com *ic = vap->iv_ic;
  	struct ieee80211_node *ni;
  	enum ieee80211_state ostate;
  	int error;
  
  	ostate = vap->iv_state;
  	IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__,
  		ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
  	vap->iv_state = nstate;			/* state transition */
  	callout_stop(&vap->iv_mgtsend);		/* XXX callout_drain */
  	if (ostate != IEEE80211_S_SCAN)
  		ieee80211_cancel_scan(vap);	/* background scan */
  	ni = vap->iv_bss;			/* NB: no reference held */
  	error = 0;
  	switch (nstate) {
  	case IEEE80211_S_INIT:
  		switch (ostate) {
  		case IEEE80211_S_SCAN:
  			ieee80211_cancel_scan(vap);
  			break;
  		default:
  			break;
  		}
  		if (ostate != IEEE80211_S_INIT) {
  			/* NB: optimize INIT -> INIT case */
  			ieee80211_reset_bss(vap);
  		}
  		break;
  	case IEEE80211_S_SCAN:
  		switch (ostate) {
  		case IEEE80211_S_INIT:
  			ieee80211_check_scan_current(vap);
  			break;
  		default:
  			break;
  		}
  		break;
  	case IEEE80211_S_RUN:
  		if (ostate == IEEE80211_S_INIT) {
  			/*
  			 * Already have a channel; bypass the scan
  			 * and startup immediately.
  			 */
  			error = ieee80211_create_wds(vap, ic->ic_curchan);
  		}
  		break;
  	default:
  		break;
  	}
  	return error;
  }
  
  /*
   * Process a received frame.  The node associated with the sender
   * should be supplied.  If nothing was found in the node table then
   * the caller is assumed to supply a reference to iv_bss instead.
   * The RSSI and a timestamp are also supplied.  The RSSI data is used
   * during AP scanning to select a AP to associate with; it can have
   * any units so long as values have consistent units and higher values
   * mean ``better signal''.  The receive timestamp is currently not used
   * by the 802.11 layer.
   */
  static int
  wds_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
  {
  #define	SEQ_LEQ(a,b)	((int)((a)-(b)) <= 0)
  #define	HAS_SEQ(type)	((type & 0x4) == 0)
  	struct ieee80211vap *vap = ni->ni_vap;
  	struct ieee80211com *ic = ni->ni_ic;
  	struct ifnet *ifp = vap->iv_ifp;
  	struct ieee80211_frame *wh;
  	struct ieee80211_key *key;
  	struct ether_header *eh;
  	int hdrspace, need_tap = 1;	/* mbuf need to be tapped. */
  	uint8_t dir, type, subtype, qos;
  	uint16_t rxseq;
  
  	if (m->m_flags & M_AMPDU_MPDU) {
  		/*
  		 * Fastpath for A-MPDU reorder q resubmission.  Frames
  		 * w/ M_AMPDU_MPDU marked have already passed through
  		 * here but were received out of order and been held on
  		 * the reorder queue.  When resubmitted they are marked
  		 * with the M_AMPDU_MPDU flag and we can bypass most of
  		 * the normal processing.
  		 */
  		wh = mtod(m, struct ieee80211_frame *);
  		type = IEEE80211_FC0_TYPE_DATA;
  		dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
  		subtype = IEEE80211_FC0_SUBTYPE_QOS;
  		hdrspace = ieee80211_hdrspace(ic, wh);	/* XXX optimize? */
  		goto resubmit_ampdu;
  	}
  
  	KASSERT(ni != NULL, ("null node"));
  
  	type = -1;			/* undefined */
  
  	if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
  		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  		    ni->ni_macaddr, NULL,
  		    "too short (1): len %u", m->m_pkthdr.len);
  		vap->iv_stats.is_rx_tooshort++;
  		goto out;
  	}
  	/*
  	 * Bit of a cheat here, we use a pointer for a 3-address
  	 * frame format but don't reference fields past outside
  	 * ieee80211_frame_min w/o first validating the data is
  	 * present.
  	 */
  	wh = mtod(m, struct ieee80211_frame *);
  
  	if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
  	    IEEE80211_FC0_VERSION_0) {
  		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  		    ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
  		    wh->i_fc[0], wh->i_fc[1]);
  		vap->iv_stats.is_rx_badversion++;
  		goto err;
  	}
  
  	dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
  	type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
  	subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
  
  	/* NB: WDS vap's do not scan */
  	if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) {
  		IEEE80211_DISCARD_MAC(vap,
  		    IEEE80211_MSG_ANY, ni->ni_macaddr, NULL,
  		    "too short (3): len %u", m->m_pkthdr.len);
  		vap->iv_stats.is_rx_tooshort++;
  		goto out;
  	}
  	/* NB: the TA is implicitly verified by finding the wds peer node */
  	if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) &&
  	    !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) {
  		/* not interested in */
  		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  		    wh->i_addr1, NULL, "%s", "not to bss");
  		vap->iv_stats.is_rx_wrongbss++;
  		goto out;
  	}
  	IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
  	ni->ni_noise = nf;
  	if (HAS_SEQ(type)) {
  		uint8_t tid = ieee80211_gettid(wh);
  		if (IEEE80211_QOS_HAS_SEQ(wh) &&
  		    TID_TO_WME_AC(tid) >= WME_AC_VI)
  			ic->ic_wme.wme_hipri_traffic++;
  		rxseq = le16toh(*(uint16_t *)wh->i_seq);
  		if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
  		    (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
  		    SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
  			/* duplicate, discard */
  			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  			    wh->i_addr1, "duplicate",
  			    "seqno <%u,%u> fragno <%u,%u> tid %u",
  			    rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
  			    ni->ni_rxseqs[tid] >> IEEE80211_SEQ_SEQ_SHIFT,
  			    rxseq & IEEE80211_SEQ_FRAG_MASK,
  			    ni->ni_rxseqs[tid] & IEEE80211_SEQ_FRAG_MASK,
  			    tid);
  			vap->iv_stats.is_rx_dup++;
  			IEEE80211_NODE_STAT(ni, rx_dup);
  			goto out;
  		}
  		ni->ni_rxseqs[tid] = rxseq;
  	}
  	switch (type) {
  	case IEEE80211_FC0_TYPE_DATA:
  		hdrspace = ieee80211_hdrspace(ic, wh);
  		if (m->m_len < hdrspace &&
  		    (m = m_pullup(m, hdrspace)) == NULL) {
  			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  			    ni->ni_macaddr, NULL,
  			    "data too short: expecting %u", hdrspace);
  			vap->iv_stats.is_rx_tooshort++;
  			goto out;		/* XXX */
  		}
  		if (dir != IEEE80211_FC1_DIR_DSTODS) {
  			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  			    wh, "data", "incorrect dir 0x%x", dir);
  			vap->iv_stats.is_rx_wrongdir++;
  			goto out;
  		}
  		/*
  		 * Only legacy WDS traffic should take this path.
  		 */
  		if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
  			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  			    wh, "data", "%s", "not legacy wds");
  			vap->iv_stats.is_rx_wrongdir++;/*XXX*/
  			goto out;
  		}
  		if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
  			ni->ni_inact = ni->ni_inact_reload;
  		/*
  		 * Handle A-MPDU re-ordering.  If the frame is to be
  		 * processed directly then ieee80211_ampdu_reorder
  		 * will return 0; otherwise it has consumed the mbuf
  		 * and we should do nothing more with it.
  		 */
  		if ((m->m_flags & M_AMPDU) &&
  		    ieee80211_ampdu_reorder(ni, m) != 0) {
  			m = NULL;
  			goto out;
  		}
  	resubmit_ampdu:
  
  		/*
  		 * Handle privacy requirements.  Note that we
  		 * must not be preempted from here until after
  		 * we (potentially) call ieee80211_crypto_demic;
  		 * otherwise we may violate assumptions in the
  		 * crypto cipher modules used to do delayed update
  		 * of replay sequence numbers.
  		 */
  		if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
  			if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
  				/*
  				 * Discard encrypted frames when privacy is off.
  				 */
  				IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  				    wh, "WEP", "%s", "PRIVACY off");
  				vap->iv_stats.is_rx_noprivacy++;
  				IEEE80211_NODE_STAT(ni, rx_noprivacy);
  				goto out;
  			}
  			key = ieee80211_crypto_decap(ni, m, hdrspace);
  			if (key == NULL) {
  				/* NB: stats+msgs handled in crypto_decap */
  				IEEE80211_NODE_STAT(ni, rx_wepfail);
  				goto out;
  			}
  			wh = mtod(m, struct ieee80211_frame *);
  			wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
  		} else {
  			/* XXX M_WEP and IEEE80211_F_PRIVACY */
  			key = NULL;
  		}
  
  		/*
  		 * Save QoS bits for use below--before we strip the header.
  		 */
  		if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
  			qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
  			    ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
  			    ((struct ieee80211_qosframe *)wh)->i_qos[0];
  		} else
  			qos = 0;
  
  		/*
  		 * Next up, any fragmentation.
  		 */
  		if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
  			m = ieee80211_defrag(ni, m, hdrspace);
  			if (m == NULL) {
  				/* Fragment dropped or frame not complete yet */
  				goto out;
  			}
  		}
  		wh = NULL;		/* no longer valid, catch any uses */
  
  		/*
  		 * Next strip any MSDU crypto bits.
  		 */
  		if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
  			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  			    ni->ni_macaddr, "data", "%s", "demic error");
  			vap->iv_stats.is_rx_demicfail++;
  			IEEE80211_NODE_STAT(ni, rx_demicfail);
  			goto out;
  		}
  
  		/* copy to listener after decrypt */
  		if (ieee80211_radiotap_active_vap(vap))
  			ieee80211_radiotap_rx(vap, m);
  		need_tap = 0;
  
  		/*
  		 * Finally, strip the 802.11 header.
  		 */
  		m = ieee80211_decap(vap, m, hdrspace);
  		if (m == NULL) {
  			/* XXX mask bit to check for both */
  			/* don't count Null data frames as errors */
  			if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
  			    subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
  				goto out;
  			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  			    ni->ni_macaddr, "data", "%s", "decap error");
  			vap->iv_stats.is_rx_decap++;
  			IEEE80211_NODE_STAT(ni, rx_decap);
  			goto err;
  		}
  		eh = mtod(m, struct ether_header *);
  		if (!ieee80211_node_is_authorized(ni)) {
  			/*
  			 * Deny any non-PAE frames received prior to
  			 * authorization.  For open/shared-key
  			 * authentication the port is mark authorized
  			 * after authentication completes.  For 802.1x
  			 * the port is not marked authorized by the
  			 * authenticator until the handshake has completed.
  			 */
  			if (eh->ether_type != htons(ETHERTYPE_PAE)) {
  				IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  				    eh->ether_shost, "data",
  				    "unauthorized port: ether type 0x%x len %u",
  				    eh->ether_type, m->m_pkthdr.len);
  				vap->iv_stats.is_rx_unauth++;
  				IEEE80211_NODE_STAT(ni, rx_unauth);
  				goto err;
  			}
  		} else {
  			/*
  			 * When denying unencrypted frames, discard
  			 * any non-PAE frames received without encryption.
  			 */
  			if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
  			    (key == NULL && (m->m_flags & M_WEP) == 0) &&
  			    eh->ether_type != htons(ETHERTYPE_PAE)) {
  				/*
  				 * Drop unencrypted frames.
  				 */
  				vap->iv_stats.is_rx_unencrypted++;
  				IEEE80211_NODE_STAT(ni, rx_unencrypted);
  				goto out;
  			}
  		}
  		/* XXX require HT? */
  		if (qos & IEEE80211_QOS_AMSDU) {
  			m = ieee80211_decap_amsdu(ni, m);
  			if (m == NULL)
  				return IEEE80211_FC0_TYPE_DATA;
  		} else {
  #ifdef IEEE80211_SUPPORT_SUPERG
  			m = ieee80211_decap_fastframe(vap, ni, m);
  			if (m == NULL)
  				return IEEE80211_FC0_TYPE_DATA;
  #endif
  		}
  		ieee80211_deliver_data(vap, ni, m);
  		return IEEE80211_FC0_TYPE_DATA;
  
  	case IEEE80211_FC0_TYPE_MGT:
  		vap->iv_stats.is_rx_mgmt++;
  		IEEE80211_NODE_STAT(ni, rx_mgmt);
  		if (dir != IEEE80211_FC1_DIR_NODS) {
  			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  			    wh, "data", "incorrect dir 0x%x", dir);
  			vap->iv_stats.is_rx_wrongdir++;
  			goto err;
  		}
  		if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
  			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  			    ni->ni_macaddr, "mgt", "too short: len %u",
  			    m->m_pkthdr.len);
  			vap->iv_stats.is_rx_tooshort++;
  			goto out;
  		}
  #ifdef IEEE80211_DEBUG
  		if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) {
  			if_printf(ifp, "received %s from %6D rssi %d\n",
  			    ieee80211_mgt_subtype_name[subtype >>
  				IEEE80211_FC0_SUBTYPE_SHIFT],
  			    wh->i_addr2, ":", rssi);
  		}
  #endif
  		if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
  			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  			    wh, NULL, "%s", "WEP set but not permitted");
  			vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
  			goto out;
  		}
  		vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
  		goto out;
  
  	case IEEE80211_FC0_TYPE_CTL:
  		vap->iv_stats.is_rx_ctl++;
  		IEEE80211_NODE_STAT(ni, rx_ctrl);
  		goto out;
  
  	default:
  		IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
  		    wh, "bad", "frame type 0x%x", type);
  		/* should not come here */
  		break;
  	}
  err:
  	ifp->if_ierrors++;
  out:
  	if (m != NULL) {
  		if (need_tap && ieee80211_radiotap_active_vap(vap))
  			ieee80211_radiotap_rx(vap, m);
  		m_freem(m);
  	}
  	return type;
  #undef SEQ_LEQ
  }
  
  static void
  wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
  	int subtype, int rssi, int nf)
  {
  	struct ieee80211vap *vap = ni->ni_vap;
  	struct ieee80211com *ic = ni->ni_ic;
  	struct ieee80211_frame *wh;
  	u_int8_t *frm, *efrm;
  
  	wh = mtod(m0, struct ieee80211_frame *);
  	frm = (u_int8_t *)&wh[1];
  	efrm = mtod(m0, u_int8_t *) + m0->m_len;
  	switch (subtype) {
  	case IEEE80211_FC0_SUBTYPE_DEAUTH:
  	case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
  	case IEEE80211_FC0_SUBTYPE_BEACON:
  	case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
  	case IEEE80211_FC0_SUBTYPE_AUTH:
  	case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
  	case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
  	case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
  	case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
  	case IEEE80211_FC0_SUBTYPE_DISASSOC:
  		vap->iv_stats.is_rx_mgtdiscard++;
  		break;
  	case IEEE80211_FC0_SUBTYPE_ACTION:
  		if (vap->iv_state != IEEE80211_S_RUN ||
  		    IEEE80211_IS_MULTICAST(wh->i_addr1)) {
  			vap->iv_stats.is_rx_mgtdiscard++;
  			break;
  		}
  		ni->ni_inact = ni->ni_inact_reload;
  		if (ieee80211_parse_action(ni, m0) == 0)
  			ic->ic_recv_action(ni, wh, frm, efrm);
  		break;
  	default:
  		IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
  		     wh, "mgt", "subtype 0x%x not handled", subtype);
  		vap->iv_stats.is_rx_badsubtype++;
  		break;
  	}
  }
  