ieee80211_wds.c

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/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * 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.
 */
 
#include <sys/cdefs.h>
#ifdef __FreeBSD__
__FBSDID("$FreeBSD$");
#endif
 
/*
 * 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_var.h>
#include <net/if_media.h>
#include <net/if_llc.h>
#include <net/ethernet.h>
 
#include <net/bpf.h>
 
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_wds.h>
#include <net80211/ieee80211_input.h>
#ifdef IEEE80211_SUPPORT_SUPERG
#include <net80211/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,
            const struct ieee80211_rx_stats *rxs, int, int);
static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, int subtype,
        const struct ieee80211_rx_stats *, 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 %s on channel %u\n", __func__,
             ether_sprintf(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.
                 */
                IEEE80211_NODE_LOCK(nt);
                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 %s went away\n",
                            __func__, ether_sprintf(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 %s in use with %s\n",
                            __func__, ether_sprintf(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;
                }
                IEEE80211_NODE_UNLOCK(nt);
                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;
        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),
            ("%s not mcast", ether_sprintf(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, M_NOWAIT);
                if (mcopy == NULL) {
                        if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
                        /* XXX stat + msg */
                        continue;
                }
                ni = ieee80211_find_txnode(vap, eh->ether_dhost);
                if (ni == NULL) {
                        /* NB: ieee80211_find_txnode does stat+msg */
                        if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
                        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++;
                        if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
                        m_freem(mcopy);
                        ieee80211_free_node(ni);
                        continue;
                }
 
                BPF_MTAP(ifp, m);               /* 802.3 tx */
 
                /*
                 * Encapsulate the packet in prep for transmission.
                 */
                IEEE80211_TX_LOCK(ic);
                mcopy = ieee80211_encap(vap, ni, mcopy);
                if (mcopy == NULL) {
                        /* NB: stat+msg handled in ieee80211_encap */
                        IEEE80211_TX_UNLOCK(ic);
                        ieee80211_free_node(ni);
                        continue;
                }
                mcopy->m_flags |= M_MCAST;
                MPASS((mcopy->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
                mcopy->m_pkthdr.rcvif = (void *) ni;
 
                err = ieee80211_parent_xmitpkt(ic, mcopy);
                IEEE80211_TX_UNLOCK(ic);
                if (!err) {
                        if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
                        if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
                        if_inc_counter(ifp, IFCOUNTER_OBYTES,
                            m->m_pkthdr.len);
                }
        }
}
 
/*
 * 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?
         */
        MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
        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;
        enum ieee80211_state ostate;
        int error;
 
        IEEE80211_LOCK_ASSERT(ic);
 
        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 */
        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,
    const struct ieee80211_rx_stats *rxs, int rssi, int nf)
{
        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;
        int is_hw_decrypted = 0;
        int has_decrypted = 0;
 
        /*
         * Some devices do hardware decryption all the way through
         * to pretending the frame wasn't encrypted in the first place.
         * So, tag it appropriately so it isn't discarded inappropriately.
         */
        if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED))
                is_hw_decrypted = 1;
 
        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 (!IEEE80211_IS_MULTICAST(wh->i_addr1))
                ni->ni_inact = ni->ni_inact_reload;
 
        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 (IEEE80211_HAS_SEQ(type, subtype)) {
                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++;
                if (! ieee80211_check_rxseq(ni, wh, wh->i_addr1, rxs))
                        goto out;
        }
        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;
                }
                /*
                 * 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, rxs) != 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 (is_hw_decrypted || wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
                        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;
                        }
                        if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
                                /* 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_PROTECTED;
                        has_decrypted = 1;
                } 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 = ieee80211_getqos(wh)[0];
                else
                        qos = 0;
 
                /*
                 * Next up, any fragmentation.
                 */
                if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
                        m = ieee80211_defrag(ni, m, hdrspace, has_decrypted);
                        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 (!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, qos);
                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;
                }
                if (!(qos & IEEE80211_QOS_AMSDU))
                        eh = mtod(m, struct ether_header *);
                else
                        eh = NULL;
                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 == NULL ||
                            eh->ether_type != htons(ETHERTYPE_PAE)) {
                                IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
                                    ni->ni_macaddr, "data", "unauthorized or "
                                    "unknown port: ether type 0x%x len %u",
                                    eh == NULL ? -1 : 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) &&
                            ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
                            (is_hw_decrypted == 0) &&
                            (eh == NULL ||
                             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 %s rssi %d\n",
                            ieee80211_mgt_subtype_name(subtype),
                            ether_sprintf(wh->i_addr2), rssi);
                }
#endif
                if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
                        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, rxs, 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:
        if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
out:
        if (m != NULL) {
                if (need_tap && ieee80211_radiotap_active_vap(vap))
                        ieee80211_radiotap_rx(vap, m);
                m_freem(m);
        }
        return type;
}
 
static void
wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
    const struct ieee80211_rx_stats *rxs, 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_ACTION:
        case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
                if (ni == vap->iv_bss) {
                        IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
                            wh, NULL, "%s", "unknown node");
                        vap->iv_stats.is_rx_mgtdiscard++;
                } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) {
                        /* NB: not interested in multicast frames. */
                        IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
                            wh, NULL, "%s", "not for us");
                        vap->iv_stats.is_rx_mgtdiscard++;
                } else if (vap->iv_state != IEEE80211_S_RUN) {
                        IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
                            wh, NULL, "wrong state %s",
                            ieee80211_state_name[vap->iv_state]);
                        vap->iv_stats.is_rx_mgtdiscard++;
                } else {
                        if (ieee80211_parse_action(ni, m0) == 0)
                                (void)ic->ic_recv_action(ni, wh, frm, efrm);
                }
                break;
 
        case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
        case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
        case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
        case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
        case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
        case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
        case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
        case IEEE80211_FC0_SUBTYPE_BEACON:
        case IEEE80211_FC0_SUBTYPE_ATIM:
        case IEEE80211_FC0_SUBTYPE_DISASSOC:
        case IEEE80211_FC0_SUBTYPE_AUTH:
        case IEEE80211_FC0_SUBTYPE_DEAUTH:
                IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
                    wh, NULL, "%s", "not handled");
                vap->iv_stats.is_rx_mgtdiscard++;
                break;
 
        default:
                IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
                    wh, "mgt", "subtype 0x%x not handled", subtype);
                vap->iv_stats.is_rx_badsubtype++;
                break;
        }
}