FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_proto.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2001 Atsushi Onoe
      * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
      * Copyright (c) 2012 IEEE
      * 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>
    __FBSDID("$FreeBSD$");
    
    /*
     * IEEE 802.11 protocol support.
     */
    
    #include "opt_inet.h"
    #include "opt_wlan.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    
    #include <sys/socket.h>
    #include <sys/sockio.h>
    
    #include <net/if.h>
    #include <net/if_var.h>
    #include <net/if_media.h>
    #include <net/ethernet.h>               /* XXX for ether_sprintf */
    
    #include <net80211/ieee80211_var.h>
    #include <net80211/ieee80211_adhoc.h>
    #include <net80211/ieee80211_sta.h>
    #include <net80211/ieee80211_hostap.h>
    #include <net80211/ieee80211_wds.h>
    #ifdef IEEE80211_SUPPORT_MESH
    #include <net80211/ieee80211_mesh.h>
    #endif
    #include <net80211/ieee80211_monitor.h>
    #include <net80211/ieee80211_input.h>
    
    /* XXX tunables */
    #define AGGRESSIVE_MODE_SWITCH_HYSTERESIS       3       /* pkts / 100ms */
    #define HIGH_PRI_SWITCH_THRESH                  10      /* pkts / 100ms */
    
    const char *mgt_subtype_name[] = {
            "assoc_req",    "assoc_resp",   "reassoc_req",  "reassoc_resp",
            "probe_req",    "probe_resp",   "timing_adv",   "reserved#7",
            "beacon",       "atim",         "disassoc",     "auth",
            "deauth",       "action",       "action_noack", "reserved#15"
    };
    const char *ctl_subtype_name[] = {
            "reserved#0",   "reserved#1",   "reserved#2",   "reserved#3",
            "reserved#4",   "reserved#5",   "reserved#6",   "control_wrap",
            "bar",          "ba",           "ps_poll",      "rts",
            "cts",          "ack",          "cf_end",       "cf_end_ack"
    };
    const char *ieee80211_opmode_name[IEEE80211_OPMODE_MAX] = {
            "IBSS",         /* IEEE80211_M_IBSS */
            "STA",          /* IEEE80211_M_STA */
            "WDS",          /* IEEE80211_M_WDS */
            "AHDEMO",       /* IEEE80211_M_AHDEMO */
            "HOSTAP",       /* IEEE80211_M_HOSTAP */
            "MONITOR",      /* IEEE80211_M_MONITOR */
            "MBSS"          /* IEEE80211_M_MBSS */
    };
    const char *ieee80211_state_name[IEEE80211_S_MAX] = {
            "INIT",         /* IEEE80211_S_INIT */
            "SCAN",         /* IEEE80211_S_SCAN */
            "AUTH",         /* IEEE80211_S_AUTH */
            "ASSOC",        /* IEEE80211_S_ASSOC */
            "CAC",          /* IEEE80211_S_CAC */
            "RUN",          /* IEEE80211_S_RUN */
            "CSA",          /* IEEE80211_S_CSA */
            "SLEEP",        /* IEEE80211_S_SLEEP */
    };
    const char *ieee80211_wme_acnames[] = {
           "WME_AC_BE",
           "WME_AC_BK",
           "WME_AC_VI",
           "WME_AC_VO",
           "WME_UPSD",
   };
   
   
   /*
    * Reason code descriptions were (mostly) obtained from
    * IEEE Std 802.11-2012, pp. 442-445 Table 8-36.
    */
   const char *
   ieee80211_reason_to_string(uint16_t reason)
   {
           switch (reason) {
           case IEEE80211_REASON_UNSPECIFIED:
                   return ("unspecified");
           case IEEE80211_REASON_AUTH_EXPIRE:
                   return ("previous authentication is expired");
           case IEEE80211_REASON_AUTH_LEAVE:
                   return ("sending STA is leaving/has left IBSS or ESS");
           case IEEE80211_REASON_ASSOC_EXPIRE:
                   return ("disassociated due to inactivity");
           case IEEE80211_REASON_ASSOC_TOOMANY:
                   return ("too many associated STAs");
           case IEEE80211_REASON_NOT_AUTHED:
                   return ("class 2 frame received from nonauthenticated STA");
           case IEEE80211_REASON_NOT_ASSOCED:
                   return ("class 3 frame received from nonassociated STA");
           case IEEE80211_REASON_ASSOC_LEAVE:
                   return ("sending STA is leaving/has left BSS");
           case IEEE80211_REASON_ASSOC_NOT_AUTHED:
                   return ("STA requesting (re)association is not authenticated");
           case IEEE80211_REASON_DISASSOC_PWRCAP_BAD:
                   return ("information in the Power Capability element is "
                           "unacceptable");
           case IEEE80211_REASON_DISASSOC_SUPCHAN_BAD:
                   return ("information in the Supported Channels element is "
                           "unacceptable");
           case IEEE80211_REASON_IE_INVALID:
                   return ("invalid element");
           case IEEE80211_REASON_MIC_FAILURE:
                   return ("MIC failure");
           case IEEE80211_REASON_4WAY_HANDSHAKE_TIMEOUT:
                   return ("4-Way handshake timeout");
           case IEEE80211_REASON_GROUP_KEY_UPDATE_TIMEOUT:
                   return ("group key update timeout");
           case IEEE80211_REASON_IE_IN_4WAY_DIFFERS:
                   return ("element in 4-Way handshake different from "
                           "(re)association request/probe response/beacon frame");
           case IEEE80211_REASON_GROUP_CIPHER_INVALID:
                   return ("invalid group cipher");
           case IEEE80211_REASON_PAIRWISE_CIPHER_INVALID:
                   return ("invalid pairwise cipher");
           case IEEE80211_REASON_AKMP_INVALID:
                   return ("invalid AKMP");
           case IEEE80211_REASON_UNSUPP_RSN_IE_VERSION:
                   return ("unsupported version in RSN IE");
           case IEEE80211_REASON_INVALID_RSN_IE_CAP:
                   return ("invalid capabilities in RSN IE");
           case IEEE80211_REASON_802_1X_AUTH_FAILED:
                   return ("IEEE 802.1X authentication failed");
           case IEEE80211_REASON_CIPHER_SUITE_REJECTED:
                   return ("cipher suite rejected because of the security "
                           "policy");
           case IEEE80211_REASON_UNSPECIFIED_QOS:
                   return ("unspecified (QoS-related)");
           case IEEE80211_REASON_INSUFFICIENT_BW:
                   return ("QoS AP lacks sufficient bandwidth for this QoS STA");
           case IEEE80211_REASON_TOOMANY_FRAMES:
                   return ("too many frames need to be acknowledged");
           case IEEE80211_REASON_OUTSIDE_TXOP:
                   return ("STA is transmitting outside the limits of its TXOPs");
           case IEEE80211_REASON_LEAVING_QBSS:
                   return ("requested from peer STA (the STA is "
                           "resetting/leaving the BSS)");
           case IEEE80211_REASON_BAD_MECHANISM:
                   return ("requested from peer STA (it does not want to use "
                           "the mechanism)");
           case IEEE80211_REASON_SETUP_NEEDED:
                   return ("requested from peer STA (setup is required for the "
                           "used mechanism)");
           case IEEE80211_REASON_TIMEOUT:
                   return ("requested from peer STA (timeout)");
           case IEEE80211_REASON_PEER_LINK_CANCELED:
                   return ("SME cancels the mesh peering instance (not related "
                           "to the maximum number of peer mesh STAs)");
           case IEEE80211_REASON_MESH_MAX_PEERS:
                   return ("maximum number of peer mesh STAs was reached");
           case IEEE80211_REASON_MESH_CPVIOLATION:
                   return ("the received information violates the Mesh "
                           "Configuration policy configured in the mesh STA "
                           "profile");
           case IEEE80211_REASON_MESH_CLOSE_RCVD:
                   return ("the mesh STA has received a Mesh Peering Close "
                           "message requesting to close the mesh peering");
           case IEEE80211_REASON_MESH_MAX_RETRIES:
                   return ("the mesh STA has resent dot11MeshMaxRetries Mesh "
                           "Peering Open messages, without receiving a Mesh "
                           "Peering Confirm message");
           case IEEE80211_REASON_MESH_CONFIRM_TIMEOUT:
                   return ("the confirmTimer for the mesh peering instance times "
                           "out");
           case IEEE80211_REASON_MESH_INVALID_GTK:
                   return ("the mesh STA fails to unwrap the GTK or the values "
                           "in the wrapped contents do not match");
           case IEEE80211_REASON_MESH_INCONS_PARAMS:
                   return ("the mesh STA receives inconsistent information about "
                           "the mesh parameters between Mesh Peering Management "
                           "frames");
           case IEEE80211_REASON_MESH_INVALID_SECURITY:
                   return ("the mesh STA fails the authenticated mesh peering "
                           "exchange because due to failure in selecting "
                           "pairwise/group ciphersuite");
           case IEEE80211_REASON_MESH_PERR_NO_PROXY:
                   return ("the mesh STA does not have proxy information for "
                           "this external destination");
           case IEEE80211_REASON_MESH_PERR_NO_FI:
                   return ("the mesh STA does not have forwarding information "
                           "for this destination");
           case IEEE80211_REASON_MESH_PERR_DEST_UNREACH:
                   return ("the mesh STA determines that the link to the next "
                           "hop of an active path in its forwarding information "
                           "is no longer usable");
           case IEEE80211_REASON_MESH_MAC_ALRDY_EXISTS_MBSS:
                   return ("the MAC address of the STA already exists in the "
                           "mesh BSS");
           case IEEE80211_REASON_MESH_CHAN_SWITCH_REG:
                   return ("the mesh STA performs channel switch to meet "
                           "regulatory requirements");
           case IEEE80211_REASON_MESH_CHAN_SWITCH_UNSPEC:
                   return ("the mesh STA performs channel switch with "
                           "unspecified reason");
           default:
                   return ("reserved/unknown");
           }
   }
   
   static void beacon_miss(void *, int);
   static void beacon_swmiss(void *, int);
   static void parent_updown(void *, int);
   static void update_mcast(void *, int);
   static void update_promisc(void *, int);
   static void update_channel(void *, int);
   static void update_chw(void *, int);
   static void vap_update_wme(void *, int);
   static void vap_update_slot(void *, int);
   static void restart_vaps(void *, int);
   static void vap_update_erp_protmode(void *, int);
   static void vap_update_preamble(void *, int);
   static void vap_update_ht_protmode(void *, int);
   static void ieee80211_newstate_cb(void *, int);
   
   static int
   null_raw_xmit(struct ieee80211_node *ni, struct mbuf *m,
           const struct ieee80211_bpf_params *params)
   {
   
           ic_printf(ni->ni_ic, "missing ic_raw_xmit callback, drop frame\n");
           m_freem(m);
           return ENETDOWN;
   }
   
   void
   ieee80211_proto_attach(struct ieee80211com *ic)
   {
           uint8_t hdrlen;
   
           /* override the 802.3 setting */
           hdrlen = ic->ic_headroom
                   + sizeof(struct ieee80211_qosframe_addr4)
                   + IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN
                   + IEEE80211_WEP_EXTIVLEN;
           /* XXX no way to recalculate on ifdetach */
           if (ALIGN(hdrlen) > max_linkhdr) {
                   /* XXX sanity check... */
                   max_linkhdr = ALIGN(hdrlen);
                   max_hdr = max_linkhdr + max_protohdr;
                   max_datalen = MHLEN - max_hdr;
           }
           //ic->ic_protmode = IEEE80211_PROT_CTSONLY;
   
           TASK_INIT(&ic->ic_parent_task, 0, parent_updown, ic);
           TASK_INIT(&ic->ic_mcast_task, 0, update_mcast, ic);
           TASK_INIT(&ic->ic_promisc_task, 0, update_promisc, ic);
           TASK_INIT(&ic->ic_chan_task, 0, update_channel, ic);
           TASK_INIT(&ic->ic_bmiss_task, 0, beacon_miss, ic);
           TASK_INIT(&ic->ic_chw_task, 0, update_chw, ic);
           TASK_INIT(&ic->ic_restart_task, 0, restart_vaps, ic);
   
           ic->ic_wme.wme_hipri_switch_hysteresis =
                   AGGRESSIVE_MODE_SWITCH_HYSTERESIS;
   
           /* initialize management frame handlers */
           ic->ic_send_mgmt = ieee80211_send_mgmt;
           ic->ic_raw_xmit = null_raw_xmit;
   
           ieee80211_adhoc_attach(ic);
           ieee80211_sta_attach(ic);
           ieee80211_wds_attach(ic);
           ieee80211_hostap_attach(ic);
   #ifdef IEEE80211_SUPPORT_MESH
           ieee80211_mesh_attach(ic);
   #endif
           ieee80211_monitor_attach(ic);
   }
   
   void
   ieee80211_proto_detach(struct ieee80211com *ic)
   {
           ieee80211_monitor_detach(ic);
   #ifdef IEEE80211_SUPPORT_MESH
           ieee80211_mesh_detach(ic);
   #endif
           ieee80211_hostap_detach(ic);
           ieee80211_wds_detach(ic);
           ieee80211_adhoc_detach(ic);
           ieee80211_sta_detach(ic);
   }
   
   static void
   null_update_beacon(struct ieee80211vap *vap, int item)
   {
   }
   
   void
   ieee80211_proto_vattach(struct ieee80211vap *vap)
   {
           struct ieee80211com *ic = vap->iv_ic;
           struct ifnet *ifp = vap->iv_ifp;
           int i;
   
           /* override the 802.3 setting */
           ifp->if_hdrlen = ic->ic_headroom
                   + sizeof(struct ieee80211_qosframe_addr4)
                   + IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN
                   + IEEE80211_WEP_EXTIVLEN;
   
           vap->iv_rtsthreshold = IEEE80211_RTS_DEFAULT;
           vap->iv_fragthreshold = IEEE80211_FRAG_DEFAULT;
           vap->iv_bmiss_max = IEEE80211_BMISS_MAX;
           callout_init_mtx(&vap->iv_swbmiss, IEEE80211_LOCK_OBJ(ic), 0);
           callout_init(&vap->iv_mgtsend, 1);
           TASK_INIT(&vap->iv_nstate_task, 0, ieee80211_newstate_cb, vap);
           TASK_INIT(&vap->iv_swbmiss_task, 0, beacon_swmiss, vap);
           TASK_INIT(&vap->iv_wme_task, 0, vap_update_wme, vap);
           TASK_INIT(&vap->iv_slot_task, 0, vap_update_slot, vap);
           TASK_INIT(&vap->iv_erp_protmode_task, 0, vap_update_erp_protmode, vap);
           TASK_INIT(&vap->iv_ht_protmode_task, 0, vap_update_ht_protmode, vap);
           TASK_INIT(&vap->iv_preamble_task, 0, vap_update_preamble, vap);
           /*
            * Install default tx rate handling: no fixed rate, lowest
            * supported rate for mgmt and multicast frames.  Default
            * max retry count.  These settings can be changed by the
            * driver and/or user applications.
            */
           for (i = IEEE80211_MODE_11A; i < IEEE80211_MODE_MAX; i++) {
                   if (isclr(ic->ic_modecaps, i))
                           continue;
   
                   const struct ieee80211_rateset *rs = &ic->ic_sup_rates[i];
   
                   vap->iv_txparms[i].ucastrate = IEEE80211_FIXED_RATE_NONE;
   
                   /*
                    * Setting the management rate to MCS 0 assumes that the
                    * BSS Basic rate set is empty and the BSS Basic MCS set
                    * is not.
                    *
                    * Since we're not checking this, default to the lowest
                    * defined rate for this mode.
                    *
                    * At least one 11n AP (DLINK DIR-825) is reported to drop
                    * some MCS management traffic (eg BA response frames.)
                    *
                    * See also: 9.6.0 of the 802.11n-2009 specification.
                    */
   #ifdef  NOTYET
                   if (i == IEEE80211_MODE_11NA || i == IEEE80211_MODE_11NG) {
                           vap->iv_txparms[i].mgmtrate = 0 | IEEE80211_RATE_MCS;
                           vap->iv_txparms[i].mcastrate = 0 | IEEE80211_RATE_MCS;
                   } else {
                           vap->iv_txparms[i].mgmtrate =
                               rs->rs_rates[0] & IEEE80211_RATE_VAL;
                           vap->iv_txparms[i].mcastrate = 
                               rs->rs_rates[0] & IEEE80211_RATE_VAL;
                   }
   #endif
                   vap->iv_txparms[i].mgmtrate = rs->rs_rates[0] & IEEE80211_RATE_VAL;
                   vap->iv_txparms[i].mcastrate = rs->rs_rates[0] & IEEE80211_RATE_VAL;
                   vap->iv_txparms[i].maxretry = IEEE80211_TXMAX_DEFAULT;
           }
           vap->iv_roaming = IEEE80211_ROAMING_AUTO;
   
           vap->iv_update_beacon = null_update_beacon;
           vap->iv_deliver_data = ieee80211_deliver_data;
           vap->iv_protmode = IEEE80211_PROT_CTSONLY;
   
           /* attach support for operating mode */
           ic->ic_vattach[vap->iv_opmode](vap);
   }
   
   void
   ieee80211_proto_vdetach(struct ieee80211vap *vap)
   {
   #define FREEAPPIE(ie) do { \
           if (ie != NULL) \
                   IEEE80211_FREE(ie, M_80211_NODE_IE); \
   } while (0)
           /*
            * Detach operating mode module.
            */
           if (vap->iv_opdetach != NULL)
                   vap->iv_opdetach(vap);
           /*
            * This should not be needed as we detach when reseting
            * the state but be conservative here since the
            * authenticator may do things like spawn kernel threads.
            */
           if (vap->iv_auth->ia_detach != NULL)
                   vap->iv_auth->ia_detach(vap);
           /*
            * Detach any ACL'ator.
            */
           if (vap->iv_acl != NULL)
                   vap->iv_acl->iac_detach(vap);
   
           FREEAPPIE(vap->iv_appie_beacon);
           FREEAPPIE(vap->iv_appie_probereq);
           FREEAPPIE(vap->iv_appie_proberesp);
           FREEAPPIE(vap->iv_appie_assocreq);
           FREEAPPIE(vap->iv_appie_assocresp);
           FREEAPPIE(vap->iv_appie_wpa);
   #undef FREEAPPIE
   }
   
   /*
    * Simple-minded authenticator module support.
    */
   
   #define IEEE80211_AUTH_MAX      (IEEE80211_AUTH_WPA+1)
   /* XXX well-known names */
   static const char *auth_modnames[IEEE80211_AUTH_MAX] = {
           "wlan_internal",        /* IEEE80211_AUTH_NONE */
           "wlan_internal",        /* IEEE80211_AUTH_OPEN */
           "wlan_internal",        /* IEEE80211_AUTH_SHARED */
           "wlan_xauth",           /* IEEE80211_AUTH_8021X  */
           "wlan_internal",        /* IEEE80211_AUTH_AUTO */
           "wlan_xauth",           /* IEEE80211_AUTH_WPA */
   };
   static const struct ieee80211_authenticator *authenticators[IEEE80211_AUTH_MAX];
   
   static const struct ieee80211_authenticator auth_internal = {
           .ia_name                = "wlan_internal",
           .ia_attach              = NULL,
           .ia_detach              = NULL,
           .ia_node_join           = NULL,
           .ia_node_leave          = NULL,
   };
   
   /*
    * Setup internal authenticators once; they are never unregistered.
    */
   static void
   ieee80211_auth_setup(void)
   {
           ieee80211_authenticator_register(IEEE80211_AUTH_OPEN, &auth_internal);
           ieee80211_authenticator_register(IEEE80211_AUTH_SHARED, &auth_internal);
           ieee80211_authenticator_register(IEEE80211_AUTH_AUTO, &auth_internal);
   }
   SYSINIT(wlan_auth, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_auth_setup, NULL);
   
   const struct ieee80211_authenticator *
   ieee80211_authenticator_get(int auth)
   {
           if (auth >= IEEE80211_AUTH_MAX)
                   return NULL;
           if (authenticators[auth] == NULL)
                   ieee80211_load_module(auth_modnames[auth]);
           return authenticators[auth];
   }
   
   void
   ieee80211_authenticator_register(int type,
           const struct ieee80211_authenticator *auth)
   {
           if (type >= IEEE80211_AUTH_MAX)
                   return;
           authenticators[type] = auth;
   }
   
   void
   ieee80211_authenticator_unregister(int type)
   {
   
           if (type >= IEEE80211_AUTH_MAX)
                   return;
           authenticators[type] = NULL;
   }
   
   /*
    * Very simple-minded ACL module support.
    */
   /* XXX just one for now */
   static  const struct ieee80211_aclator *acl = NULL;
   
   void
   ieee80211_aclator_register(const struct ieee80211_aclator *iac)
   {
           printf("wlan: %s acl policy registered\n", iac->iac_name);
           acl = iac;
   }
   
   void
   ieee80211_aclator_unregister(const struct ieee80211_aclator *iac)
   {
           if (acl == iac)
                   acl = NULL;
           printf("wlan: %s acl policy unregistered\n", iac->iac_name);
   }
   
   const struct ieee80211_aclator *
   ieee80211_aclator_get(const char *name)
   {
           if (acl == NULL)
                   ieee80211_load_module("wlan_acl");
           return acl != NULL && strcmp(acl->iac_name, name) == 0 ? acl : NULL;
   }
   
   void
   ieee80211_print_essid(const uint8_t *essid, int len)
   {
           const uint8_t *p;
           int i;
   
           if (len > IEEE80211_NWID_LEN)
                   len = IEEE80211_NWID_LEN;
           /* determine printable or not */
           for (i = 0, p = essid; i < len; i++, p++) {
                   if (*p < ' ' || *p > 0x7e)
                           break;
           }
           if (i == len) {
                   printf("\"");
                   for (i = 0, p = essid; i < len; i++, p++)
                           printf("%c", *p);
                   printf("\"");
           } else {
                   printf("0x");
                   for (i = 0, p = essid; i < len; i++, p++)
                           printf("%02x", *p);
           }
   }
   
   void
   ieee80211_dump_pkt(struct ieee80211com *ic,
           const uint8_t *buf, int len, int rate, int rssi)
   {
           const struct ieee80211_frame *wh;
           int i;
   
           wh = (const struct ieee80211_frame *)buf;
           switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) {
           case IEEE80211_FC1_DIR_NODS:
                   printf("NODS %s", ether_sprintf(wh->i_addr2));
                   printf("->%s", ether_sprintf(wh->i_addr1));
                   printf("(%s)", ether_sprintf(wh->i_addr3));
                   break;
           case IEEE80211_FC1_DIR_TODS:
                   printf("TODS %s", ether_sprintf(wh->i_addr2));
                   printf("->%s", ether_sprintf(wh->i_addr3));
                   printf("(%s)", ether_sprintf(wh->i_addr1));
                   break;
           case IEEE80211_FC1_DIR_FROMDS:
                   printf("FRDS %s", ether_sprintf(wh->i_addr3));
                   printf("->%s", ether_sprintf(wh->i_addr1));
                   printf("(%s)", ether_sprintf(wh->i_addr2));
                   break;
           case IEEE80211_FC1_DIR_DSTODS:
                   printf("DSDS %s", ether_sprintf((const uint8_t *)&wh[1]));
                   printf("->%s", ether_sprintf(wh->i_addr3));
                   printf("(%s", ether_sprintf(wh->i_addr2));
                   printf("->%s)", ether_sprintf(wh->i_addr1));
                   break;
           }
           switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) {
           case IEEE80211_FC0_TYPE_DATA:
                   printf(" data");
                   break;
           case IEEE80211_FC0_TYPE_MGT:
                   printf(" %s", ieee80211_mgt_subtype_name(wh->i_fc[0]));
                   break;
           default:
                   printf(" type#%d", wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK);
                   break;
           }
           if (IEEE80211_QOS_HAS_SEQ(wh)) {
                   const struct ieee80211_qosframe *qwh = 
                           (const struct ieee80211_qosframe *)buf;
                   printf(" QoS [TID %u%s]", qwh->i_qos[0] & IEEE80211_QOS_TID,
                           qwh->i_qos[0] & IEEE80211_QOS_ACKPOLICY ? " ACM" : "");
           }
           if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
                   int off;
   
                   off = ieee80211_anyhdrspace(ic, wh);
                   printf(" WEP [IV %.02x %.02x %.02x",
                           buf[off+0], buf[off+1], buf[off+2]);
                   if (buf[off+IEEE80211_WEP_IVLEN] & IEEE80211_WEP_EXTIV)
                           printf(" %.02x %.02x %.02x",
                                   buf[off+4], buf[off+5], buf[off+6]);
                   printf(" KID %u]", buf[off+IEEE80211_WEP_IVLEN] >> 6);
           }
           if (rate >= 0)
                   printf(" %dM", rate / 2);
           if (rssi >= 0)
                   printf(" +%d", rssi);
           printf("\n");
           if (len > 0) {
                   for (i = 0; i < len; i++) {
                           if ((i & 1) == 0)
                                   printf(" ");
                           printf("%02x", buf[i]);
                   }
                   printf("\n");
           }
   }
   
   static __inline int
   findrix(const struct ieee80211_rateset *rs, int r)
   {
           int i;
   
           for (i = 0; i < rs->rs_nrates; i++)
                   if ((rs->rs_rates[i] & IEEE80211_RATE_VAL) == r)
                           return i;
           return -1;
   }
   
   int
   ieee80211_fix_rate(struct ieee80211_node *ni,
           struct ieee80211_rateset *nrs, int flags)
   {
           struct ieee80211vap *vap = ni->ni_vap;
           struct ieee80211com *ic = ni->ni_ic;
           int i, j, rix, error;
           int okrate, badrate, fixedrate, ucastrate;
           const struct ieee80211_rateset *srs;
           uint8_t r;
   
           error = 0;
           okrate = badrate = 0;
           ucastrate = vap->iv_txparms[ieee80211_chan2mode(ni->ni_chan)].ucastrate;
           if (ucastrate != IEEE80211_FIXED_RATE_NONE) {
                   /*
                    * Workaround awkwardness with fixed rate.  We are called
                    * to check both the legacy rate set and the HT rate set
                    * but we must apply any legacy fixed rate check only to the
                    * legacy rate set and vice versa.  We cannot tell what type
                    * of rate set we've been given (legacy or HT) but we can
                    * distinguish the fixed rate type (MCS have 0x80 set).
                    * So to deal with this the caller communicates whether to
                    * check MCS or legacy rate using the flags and we use the
                    * type of any fixed rate to avoid applying an MCS to a
                    * legacy rate and vice versa.
                    */
                   if (ucastrate & 0x80) {
                           if (flags & IEEE80211_F_DOFRATE)
                                   flags &= ~IEEE80211_F_DOFRATE;
                   } else if ((ucastrate & 0x80) == 0) {
                           if (flags & IEEE80211_F_DOFMCS)
                                   flags &= ~IEEE80211_F_DOFMCS;
                   }
                   /* NB: required to make MCS match below work */
                   ucastrate &= IEEE80211_RATE_VAL;
           }
           fixedrate = IEEE80211_FIXED_RATE_NONE;
           /*
            * XXX we are called to process both MCS and legacy rates;
            * we must use the appropriate basic rate set or chaos will
            * ensue; for now callers that want MCS must supply
            * IEEE80211_F_DOBRS; at some point we'll need to split this
            * function so there are two variants, one for MCS and one
            * for legacy rates.
            */
           if (flags & IEEE80211_F_DOBRS)
                   srs = (const struct ieee80211_rateset *)
                       ieee80211_get_suphtrates(ic, ni->ni_chan);
           else
                   srs = ieee80211_get_suprates(ic, ni->ni_chan);
           for (i = 0; i < nrs->rs_nrates; ) {
                   if (flags & IEEE80211_F_DOSORT) {
                           /*
                            * Sort rates.
                            */
                           for (j = i + 1; j < nrs->rs_nrates; j++) {
                                   if (IEEE80211_RV(nrs->rs_rates[i]) >
                                       IEEE80211_RV(nrs->rs_rates[j])) {
                                           r = nrs->rs_rates[i];
                                           nrs->rs_rates[i] = nrs->rs_rates[j];
                                           nrs->rs_rates[j] = r;
                                   }
                           }
                   }
                   r = nrs->rs_rates[i] & IEEE80211_RATE_VAL;
                   badrate = r;
                   /*
                    * Check for fixed rate.
                    */
                   if (r == ucastrate)
                           fixedrate = r;
                   /*
                    * Check against supported rates.
                    */
                   rix = findrix(srs, r);
                   if (flags & IEEE80211_F_DONEGO) {
                           if (rix < 0) {
                                   /*
                                    * A rate in the node's rate set is not
                                    * supported.  If this is a basic rate and we
                                    * are operating as a STA then this is an error.
                                    * Otherwise we just discard/ignore the rate.
                                    */
                                   if ((flags & IEEE80211_F_JOIN) &&
                                       (nrs->rs_rates[i] & IEEE80211_RATE_BASIC))
                                           error++;
                           } else if ((flags & IEEE80211_F_JOIN) == 0) {
                                   /*
                                    * Overwrite with the supported rate
                                    * value so any basic rate bit is set.
                                    */
                                   nrs->rs_rates[i] = srs->rs_rates[rix];
                           }
                   }
                   if ((flags & IEEE80211_F_DODEL) && rix < 0) {
                           /*
                            * Delete unacceptable rates.
                            */
                           nrs->rs_nrates--;
                           for (j = i; j < nrs->rs_nrates; j++)
                                   nrs->rs_rates[j] = nrs->rs_rates[j + 1];
                           nrs->rs_rates[j] = 0;
                           continue;
                   }
                   if (rix >= 0)
                           okrate = nrs->rs_rates[i];
                   i++;
           }
           if (okrate == 0 || error != 0 ||
               ((flags & (IEEE80211_F_DOFRATE|IEEE80211_F_DOFMCS)) &&
                fixedrate != ucastrate)) {
                   IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
                       "%s: flags 0x%x okrate %d error %d fixedrate 0x%x "
                       "ucastrate %x\n", __func__, fixedrate, ucastrate, flags);
                   return badrate | IEEE80211_RATE_BASIC;
           } else
                   return IEEE80211_RV(okrate);
   }
   
   /*
    * Reset 11g-related state.
    *
    * This is for per-VAP ERP/11g state.
    *
    * Eventually everything in ieee80211_reset_erp() will be
    * per-VAP and in here.
    */
   void
   ieee80211_vap_reset_erp(struct ieee80211vap *vap)
   {
           struct ieee80211com *ic = vap->iv_ic;
   
           vap->iv_nonerpsta = 0;
           vap->iv_longslotsta = 0;
   
           vap->iv_flags &= ~IEEE80211_F_USEPROT;
           /*
            * Set short preamble and ERP barker-preamble flags.
            */
           if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
               (vap->iv_caps & IEEE80211_C_SHPREAMBLE)) {
                   vap->iv_flags |= IEEE80211_F_SHPREAMBLE;
                   vap->iv_flags &= ~IEEE80211_F_USEBARKER;
           } else {
                   vap->iv_flags &= ~IEEE80211_F_SHPREAMBLE;
                   vap->iv_flags |= IEEE80211_F_USEBARKER;
           }
   
           /*
            * Short slot time is enabled only when operating in 11g
            * and not in an IBSS.  We must also honor whether or not
            * the driver is capable of doing it.
            */
           ieee80211_vap_set_shortslottime(vap,
                   IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
                   IEEE80211_IS_CHAN_HT(ic->ic_curchan) ||
                   (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
                   vap->iv_opmode == IEEE80211_M_HOSTAP &&
                   (ic->ic_caps & IEEE80211_C_SHSLOT)));
   }
   
   /*
    * Reset 11g-related state.
    *
    * Note this resets the global state and a caller should schedule
    * a re-check of all the VAPs after setup to update said state.
    */
   void
   ieee80211_reset_erp(struct ieee80211com *ic)
   {
   #if 0
           ic->ic_flags &= ~IEEE80211_F_USEPROT;
           /*
            * Set short preamble and ERP barker-preamble flags.
            */
           if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
               (ic->ic_caps & IEEE80211_C_SHPREAMBLE)) {
                   ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
                   ic->ic_flags &= ~IEEE80211_F_USEBARKER;
           } else {
                   ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
                   ic->ic_flags |= IEEE80211_F_USEBARKER;
           }
   #endif
           /* XXX TODO: schedule a new per-VAP ERP calculation */
   }
   
   /*
    * Deferred slot time update.
    *
    * For per-VAP slot time configuration, call the VAP
    * method if the VAP requires it.  Otherwise, just call the
    * older global method.
    *
    * If the per-VAP method is called then it's expected that
    * the driver/firmware will take care of turning the per-VAP
    * flags into slot time configuration.
    *
    * If the per-VAP method is not called then the global flags will be
    * flipped into sync with the VAPs; ic_flags IEEE80211_F_SHSLOT will
    * be set only if all of the vaps will have it set.
    *
    * Look at the comments for vap_update_erp_protmode() for more
    * background; this assumes all VAPs are on the same channel.
    */
   static void
   vap_update_slot(void *arg, int npending)
   {
           struct ieee80211vap *vap = arg;
           struct ieee80211com *ic = vap->iv_ic;
           struct ieee80211vap *iv;
           int num_shslot = 0, num_lgslot = 0;
   
           /*
            * Per-VAP path - we've already had the flags updated;
            * so just notify the driver and move on.
            */
           if (vap->iv_updateslot != NULL) {
                   vap->iv_updateslot(vap);
                   return;
           }
   
           /*
            * Iterate over all of the VAP flags to update the
            * global flag.
            *
            * If all vaps have short slot enabled then flip on
            * short slot.  If any vap has it disabled then
            * we leave it globally disabled.  This should provide
            * correct behaviour in a multi-BSS scenario where
            * at least one VAP has short slot disabled for some
            * reason.
            */
           IEEE80211_LOCK(ic);
           TAILQ_FOREACH(iv, &ic->ic_vaps, iv_next) {
                   if (iv->iv_flags & IEEE80211_F_SHSLOT)
                           num_shslot++;
                   else
                           num_lgslot++;
           }
   
           /*
            * It looks backwards but - if the number of short slot VAPs
            * is zero then we're not short slot.  Else, we have one
            * or more short slot VAPs and we're checking to see if ANY
            * of them have short slot disabled.
            */
           if (num_shslot == 0)
                   ic->ic_flags &= ~IEEE80211_F_SHSLOT;
           else if (num_lgslot == 0)
                   ic->ic_flags |= IEEE80211_F_SHSLOT;
           IEEE80211_UNLOCK(ic);
   
           /*
            * Call the driver with our new global slot time flags.
            */
           if (ic->ic_updateslot != NULL)
                   ic->ic_updateslot(ic);
   }
   
   /*
    * Deferred ERP protmode update.
    *
    * This currently calculates the global ERP protection mode flag
    * based on each of the VAPs.  Any VAP with it enabled is enough
    * for the global flag to be enabled.  All VAPs with it disabled
    * is enough for it to be disabled.
    *
    * This may make sense right now for the supported hardware where
    * net80211 is controlling the single channel configuration, but
    * offload firmware that's doing channel changes (eg off-channel
    * TDLS, off-channel STA, off-channel P2P STA/AP) may get some
    * silly looking flag updates.
    *
    * Ideally the protection mode calculation is done based on the
    * channel, and all VAPs using that channel will inherit it.
    * But until that's what net80211 does, this wil have to do.
    */
   static void
   vap_update_erp_protmode(void *arg, int npending)
   {
           struct ieee80211vap *vap = arg;
           struct ieee80211com *ic = vap->iv_ic;
           struct ieee80211vap *iv;
           int enable_protmode = 0;
           int non_erp_present = 0;
   
           /*
            * Iterate over all of the VAPs to calculate the overlapping
            * ERP protection mode configuration and ERP present math.
            *
            * For now we assume that if a driver can handle this per-VAP
            * then it'll ignore the ic->ic_protmode variant and instead
            * will look at the vap related flags.
            */
           IEEE80211_LOCK(ic);
           TAILQ_FOREACH(iv, &ic->ic_vaps, iv_next) {
                   if (iv->iv_flags & IEEE80211_F_USEPROT)
                           enable_protmode = 1;
                   if (iv->iv_flags_ext & IEEE80211_FEXT_NONERP_PR)
                           non_erp_present = 1;
           }
   
           if (enable_protmode)
                   ic->ic_flags |= IEEE80211_F_USEPROT;
           else
                   ic->ic_flags &= ~IEEE80211_F_USEPROT;
   
           if (non_erp_present)
                   ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR;
           else
                   ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
   
           /* Beacon update on all VAPs */
           ieee80211_notify_erp_locked(ic);
   
           IEEE80211_UNLOCK(ic);
   
           IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG,
               "%s: called; enable_protmode=%d, non_erp_present=%d\n",
               __func__, enable_protmode, non_erp_present);
   
           /*
            * Now that the global configuration flags are calculated,
            * notify the VAP about its configuration.
            *
            * The global flags will be used when assembling ERP IEs
            * for multi-VAP operation, even if it's on a different
            * channel.  Yes, that's going to need fixing in the
            * future.
            */
           if (vap->iv_erp_protmode_update != NULL)
                   vap->iv_erp_protmode_update(vap);
   }
   
   /*
    * Deferred ERP short preamble/barker update.
    *
    * All VAPs need to use short preamble for it to be globally
    * enabled or not.
    *
    * Look at the comments for vap_update_erp_protmode() for more
    * background; this assumes all VAPs are on the same channel.
    */
   static void
   vap_update_preamble(void *arg, int npending)
   {
           struct ieee80211vap *vap = arg;
           struct ieee80211com *ic = vap->iv_ic;
           struct ieee80211vap *iv;
           int barker_count = 0, short_preamble_count = 0, count = 0;
   
           /*
            * Iterate over all of the VAPs to calculate the overlapping
            * short or long preamble configuration.
            *
            * For now we assume that if a driver can handle this per-VAP
            * then it'll ignore the ic->ic_flags variant and instead
            * will look at the vap related flags.
           */
          IEEE80211_LOCK(ic);
          TAILQ_FOREACH(iv, &ic->ic_vaps, iv_next) {
                  if (iv->iv_flags & IEEE80211_F_USEBARKER)
                          barker_count++;
                  if (iv->iv_flags & IEEE80211_F_SHPREAMBLE)
                          short_preamble_count++;
                  count++;
          }
  
          /*
           * As with vap_update_erp_protmode(), the global flags are
           * currently used for beacon IEs.
           */
          IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG,
              "%s: called; barker_count=%d, short_preamble_count=%d\n",
              __func__, barker_count, short_preamble_count);
  
          /*
           * Only flip on short preamble if all of the VAPs support
           * it.
           */
          if (barker_count == 0 && short_preamble_count == count) {
                  ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
                  ic->ic_flags &= ~IEEE80211_F_USEBARKER;
          } else {
                  ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
                  ic->ic_flags |= IEEE80211_F_USEBARKER;
          }
          IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG,
            "%s: global barker=%d preamble=%d\n",
            __func__,
            !! (ic->ic_flags & IEEE80211_F_USEBARKER),
            !! (ic->ic_flags & IEEE80211_F_SHPREAMBLE));
  
          /* Beacon update on all VAPs */
          ieee80211_notify_erp_locked(ic);
  
          IEEE80211_UNLOCK(ic);
  
          /* Driver notification */
          if (vap->iv_erp_protmode_update != NULL)
                  vap->iv_preamble_update(vap);
  }
  
  /*
   * Deferred HT protmode update and beacon update.
   *
   * Look at the comments for vap_update_erp_protmode() for more
   * background; this assumes all VAPs are on the same channel.
   */
  static void
  vap_update_ht_protmode(void *arg, int npending)
  {
          struct ieee80211vap *vap = arg;
          struct ieee80211vap *iv;
          struct ieee80211com *ic = vap->iv_ic;
          int num_vaps = 0, num_pure = 0;
          int num_optional = 0, num_ht2040 = 0, num_nonht = 0;
          int num_ht_sta = 0, num_ht40_sta = 0, num_sta = 0;
          int num_nonhtpr = 0;
  
          /*
           * Iterate over all of the VAPs to calculate everything.
           *
           * There are a few different flags to calculate:
           *
           * + whether there's HT only or HT+legacy stations;
           * + whether there's HT20, HT40, or HT20+HT40 stations;
           * + whether the desired protection mode is mixed, pure or
           *   one of the two above.
           *
           * For now we assume that if a driver can handle this per-VAP
           * then it'll ignore the ic->ic_htprotmode / ic->ic_curhtprotmode
           * variant and instead will look at the vap related variables.
           *
           * XXX TODO: non-greenfield STAs present (IEEE80211_HTINFO_NONGF_PRESENT) !
           */
  
          IEEE80211_LOCK(ic);
          TAILQ_FOREACH(iv, &ic->ic_vaps, iv_next) {
                  num_vaps++;
                  /* overlapping BSSes advertising non-HT status present */
                  if (iv->iv_flags_ht & IEEE80211_FHT_NONHT_PR)
                          num_nonht++;
                  /* Operating mode flags */
                  if (iv->iv_curhtprotmode & IEEE80211_HTINFO_NONHT_PRESENT)
                          num_nonhtpr++;
                  switch (iv->iv_curhtprotmode & IEEE80211_HTINFO_OPMODE) {
                  case IEEE80211_HTINFO_OPMODE_PURE:
                          num_pure++;
                          break;
                  case IEEE80211_HTINFO_OPMODE_PROTOPT:
                          num_optional++;
                          break;
                  case IEEE80211_HTINFO_OPMODE_HT20PR:
                          num_ht2040++;
                          break;
                  }
  
                  IEEE80211_DPRINTF(vap, IEEE80211_MSG_11N,
                      "%s: vap %s: nonht_pr=%d, curhtprotmode=0x%02x\n",
                      __func__,
                      ieee80211_get_vap_ifname(iv),
                      !! (iv->iv_flags_ht & IEEE80211_FHT_NONHT_PR),
                      iv->iv_curhtprotmode);
  
                  num_ht_sta += iv->iv_ht_sta_assoc;
                  num_ht40_sta += iv->iv_ht40_sta_assoc;
                  num_sta += iv->iv_sta_assoc;
          }
  
          /*
           * Step 1 - if any VAPs indicate NONHT_PR set (overlapping BSS
           * non-HT present), set it here.  This shouldn't be used by
           * anything but the old overlapping BSS logic so if any drivers
           * consume it, it's up to date.
           */
          if (num_nonht > 0)
                  ic->ic_flags_ht |= IEEE80211_FHT_NONHT_PR;
          else
                  ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
  
          /*
           * Step 2 - default HT protection mode to MIXED (802.11-2016 10.26.3.1.)
           *
           * + If all VAPs are PURE, we can stay PURE.
           * + If all VAPs are PROTOPT, we can go to PROTOPT.
           * + If any VAP has HT20PR then it sees at least a HT40+HT20 station.
           *   Note that we may have a VAP with one HT20 and a VAP with one HT40;
           *   So we look at the sum ht and sum ht40 sta counts; if we have a
           *   HT station and the HT20 != HT40 count, we have to do HT20PR here.
           *   Note all stations need to be HT for this to be an option.
           * + The fall-through is MIXED, because it means we have some odd
           *   non HT40-involved combination of opmode and this is the most
           *   sensible default.
           */
          ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_MIXED;
  
          if (num_pure == num_vaps)
                  ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE;
  
          if (num_optional == num_vaps)
                  ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PROTOPT;
  
          /*
           * Note: we need /a/ HT40 station somewhere for this to
           * be a possibility.
           */
          if ((num_ht2040 > 0) ||
              ((num_ht_sta > 0) && (num_ht40_sta > 0) &&
               (num_ht_sta != num_ht40_sta)))
                  ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_HT20PR;
  
          /*
           * Step 3 - if any of the stations across the VAPs are
           * non-HT then this needs to be flipped back to MIXED.
           */
          if (num_ht_sta != num_sta)
                  ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_MIXED;
  
          /*
           * Step 4 - If we see any overlapping BSS non-HT stations
           * via beacons then flip on NONHT_PRESENT.
           */
          if (num_nonhtpr > 0)
                  ic->ic_curhtprotmode |= IEEE80211_HTINFO_NONHT_PRESENT;
  
          /* Notify all VAPs to potentially update their beacons */
          TAILQ_FOREACH(iv, &ic->ic_vaps, iv_next)
                  ieee80211_htinfo_notify(iv);
  
          IEEE80211_UNLOCK(ic);
  
          IEEE80211_DPRINTF(vap, IEEE80211_MSG_11N,
            "%s: global: nonht_pr=%d ht_opmode=0x%02x\n",
            __func__,
            !! (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR),
            ic->ic_curhtprotmode);
  
          /* Driver update */
          if (vap->iv_erp_protmode_update != NULL)
                  vap->iv_ht_protmode_update(vap);
  }
  
  /*
   * Set the short slot time state and notify the driver.
   *
   * This is the per-VAP slot time state.
   */
  void
  ieee80211_vap_set_shortslottime(struct ieee80211vap *vap, int onoff)
  {
          struct ieee80211com *ic = vap->iv_ic;
  
          /* XXX lock? */
  
          /*
           * Only modify the per-VAP slot time.
           */
          if (onoff)
                  vap->iv_flags |= IEEE80211_F_SHSLOT;
          else
                  vap->iv_flags &= ~IEEE80211_F_SHSLOT;
  
          IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG,
              "%s: called; onoff=%d\n", __func__, onoff);
          /* schedule the deferred slot flag update and update */
          ieee80211_runtask(ic, &vap->iv_slot_task);
  }
  
  /*
   * Update the VAP short /long / barker preamble state and
   * update beacon state if needed.
   *
   * For now it simply copies the global flags into the per-vap
   * flags and schedules the callback.  Later this will support
   * both global and per-VAP flags, especially useful for
   * and STA+STA multi-channel operation (eg p2p).
   */
  void
  ieee80211_vap_update_preamble(struct ieee80211vap *vap)
  {
          struct ieee80211com *ic = vap->iv_ic;
  
          /* XXX lock? */
  
          IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG,
              "%s: called\n", __func__);
          /* schedule the deferred slot flag update and update */
          ieee80211_runtask(ic, &vap->iv_preamble_task);
  }
  
  /*
   * Update the VAP 11g protection mode and update beacon state
   * if needed.
   */
  void
  ieee80211_vap_update_erp_protmode(struct ieee80211vap *vap)
  {
          struct ieee80211com *ic = vap->iv_ic;
  
          /* XXX lock? */
  
          IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG,
              "%s: called\n", __func__);
          /* schedule the deferred slot flag update and update */
          ieee80211_runtask(ic, &vap->iv_erp_protmode_task);
  }
  
  /*
   * Update the VAP 11n protection mode and update beacon state
   * if needed.
   */
  void
  ieee80211_vap_update_ht_protmode(struct ieee80211vap *vap)
  {
          struct ieee80211com *ic = vap->iv_ic;
  
          /* XXX lock? */
  
          IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG,
              "%s: called\n", __func__);
          /* schedule the deferred protmode update */
          ieee80211_runtask(ic, &vap->iv_ht_protmode_task);
  }
  
  /*
   * Check if the specified rate set supports ERP.
   * NB: the rate set is assumed to be sorted.
   */
  int
  ieee80211_iserp_rateset(const struct ieee80211_rateset *rs)
  {
          static const int rates[] = { 2, 4, 11, 22, 12, 24, 48 };
          int i, j;
  
          if (rs->rs_nrates < nitems(rates))
                  return 0;
          for (i = 0; i < nitems(rates); i++) {
                  for (j = 0; j < rs->rs_nrates; j++) {
                          int r = rs->rs_rates[j] & IEEE80211_RATE_VAL;
                          if (rates[i] == r)
                                  goto next;
                          if (r > rates[i])
                                  return 0;
                  }
                  return 0;
          next:
                  ;
          }
          return 1;
  }
  
  /*
   * Mark the basic rates for the rate table based on the
   * operating mode.  For real 11g we mark all the 11b rates
   * and 6, 12, and 24 OFDM.  For 11b compatibility we mark only
   * 11b rates.  There's also a pseudo 11a-mode used to mark only
   * the basic OFDM rates.
   */
  static void
  setbasicrates(struct ieee80211_rateset *rs,
      enum ieee80211_phymode mode, int add)
  {
          static const struct ieee80211_rateset basic[IEEE80211_MODE_MAX] = {
              [IEEE80211_MODE_11A]        = { 3, { 12, 24, 48 } },
              [IEEE80211_MODE_11B]        = { 2, { 2, 4 } },
                                              /* NB: mixed b/g */
              [IEEE80211_MODE_11G]        = { 4, { 2, 4, 11, 22 } },
              [IEEE80211_MODE_TURBO_A]    = { 3, { 12, 24, 48 } },
              [IEEE80211_MODE_TURBO_G]    = { 4, { 2, 4, 11, 22 } },
              [IEEE80211_MODE_STURBO_A]   = { 3, { 12, 24, 48 } },
              [IEEE80211_MODE_HALF]       = { 3, { 6, 12, 24 } },
              [IEEE80211_MODE_QUARTER]    = { 3, { 3, 6, 12 } },
              [IEEE80211_MODE_11NA]       = { 3, { 12, 24, 48 } },
                                              /* NB: mixed b/g */
              [IEEE80211_MODE_11NG]       = { 4, { 2, 4, 11, 22 } },
                                              /* NB: mixed b/g */
              [IEEE80211_MODE_VHT_2GHZ]   = { 4, { 2, 4, 11, 22 } },
              [IEEE80211_MODE_VHT_5GHZ]   = { 3, { 12, 24, 48 } },
          };
          int i, j;
  
          for (i = 0; i < rs->rs_nrates; i++) {
                  if (!add)
                          rs->rs_rates[i] &= IEEE80211_RATE_VAL;
                  for (j = 0; j < basic[mode].rs_nrates; j++)
                          if (basic[mode].rs_rates[j] == rs->rs_rates[i]) {
                                  rs->rs_rates[i] |= IEEE80211_RATE_BASIC;
                                  break;
                          }
          }
  }
  
  /*
   * Set the basic rates in a rate set.
   */
  void
  ieee80211_setbasicrates(struct ieee80211_rateset *rs,
      enum ieee80211_phymode mode)
  {
          setbasicrates(rs, mode, 0);
  }
  
  /*
   * Add basic rates to a rate set.
   */
  void
  ieee80211_addbasicrates(struct ieee80211_rateset *rs,
      enum ieee80211_phymode mode)
  {
          setbasicrates(rs, mode, 1);
  }
  
  /*
   * WME protocol support.
   *
   * The default 11a/b/g/n parameters come from the WiFi Alliance WMM
   * System Interopability Test Plan (v1.4, Appendix F) and the 802.11n
   * Draft 2.0 Test Plan (Appendix D).
   *
   * Static/Dynamic Turbo mode settings come from Atheros.
   */
  typedef struct phyParamType {
          uint8_t         aifsn;
          uint8_t         logcwmin;
          uint8_t         logcwmax;
          uint16_t        txopLimit;
          uint8_t         acm;
  } paramType;
  
  static const struct phyParamType phyParamForAC_BE[IEEE80211_MODE_MAX] = {
          [IEEE80211_MODE_AUTO]   = { 3, 4,  6,  0, 0 },
          [IEEE80211_MODE_11A]    = { 3, 4,  6,  0, 0 },
          [IEEE80211_MODE_11B]    = { 3, 4,  6,  0, 0 },
          [IEEE80211_MODE_11G]    = { 3, 4,  6,  0, 0 },
          [IEEE80211_MODE_FH]     = { 3, 4,  6,  0, 0 },
          [IEEE80211_MODE_TURBO_A]= { 2, 3,  5,  0, 0 },
          [IEEE80211_MODE_TURBO_G]= { 2, 3,  5,  0, 0 },
          [IEEE80211_MODE_STURBO_A]={ 2, 3,  5,  0, 0 },
          [IEEE80211_MODE_HALF]   = { 3, 4,  6,  0, 0 },
          [IEEE80211_MODE_QUARTER]= { 3, 4,  6,  0, 0 },
          [IEEE80211_MODE_11NA]   = { 3, 4,  6,  0, 0 },
          [IEEE80211_MODE_11NG]   = { 3, 4,  6,  0, 0 },
          [IEEE80211_MODE_VHT_2GHZ]       = { 3, 4,  6,  0, 0 },
          [IEEE80211_MODE_VHT_5GHZ]       = { 3, 4,  6,  0, 0 },
  };
  static const struct phyParamType phyParamForAC_BK[IEEE80211_MODE_MAX] = {
          [IEEE80211_MODE_AUTO]   = { 7, 4, 10,  0, 0 },
          [IEEE80211_MODE_11A]    = { 7, 4, 10,  0, 0 },
          [IEEE80211_MODE_11B]    = { 7, 4, 10,  0, 0 },
          [IEEE80211_MODE_11G]    = { 7, 4, 10,  0, 0 },
          [IEEE80211_MODE_FH]     = { 7, 4, 10,  0, 0 },
          [IEEE80211_MODE_TURBO_A]= { 7, 3, 10,  0, 0 },
          [IEEE80211_MODE_TURBO_G]= { 7, 3, 10,  0, 0 },
          [IEEE80211_MODE_STURBO_A]={ 7, 3, 10,  0, 0 },
          [IEEE80211_MODE_HALF]   = { 7, 4, 10,  0, 0 },
          [IEEE80211_MODE_QUARTER]= { 7, 4, 10,  0, 0 },
          [IEEE80211_MODE_11NA]   = { 7, 4, 10,  0, 0 },
          [IEEE80211_MODE_11NG]   = { 7, 4, 10,  0, 0 },
          [IEEE80211_MODE_VHT_2GHZ]       = { 7, 4, 10,  0, 0 },
          [IEEE80211_MODE_VHT_5GHZ]       = { 7, 4, 10,  0, 0 },
  };
  static const struct phyParamType phyParamForAC_VI[IEEE80211_MODE_MAX] = {
          [IEEE80211_MODE_AUTO]   = { 1, 3, 4,  94, 0 },
          [IEEE80211_MODE_11A]    = { 1, 3, 4,  94, 0 },
          [IEEE80211_MODE_11B]    = { 1, 3, 4, 188, 0 },
          [IEEE80211_MODE_11G]    = { 1, 3, 4,  94, 0 },
          [IEEE80211_MODE_FH]     = { 1, 3, 4, 188, 0 },
          [IEEE80211_MODE_TURBO_A]= { 1, 2, 3,  94, 0 },
          [IEEE80211_MODE_TURBO_G]= { 1, 2, 3,  94, 0 },
          [IEEE80211_MODE_STURBO_A]={ 1, 2, 3,  94, 0 },
          [IEEE80211_MODE_HALF]   = { 1, 3, 4,  94, 0 },
          [IEEE80211_MODE_QUARTER]= { 1, 3, 4,  94, 0 },
          [IEEE80211_MODE_11NA]   = { 1, 3, 4,  94, 0 },
          [IEEE80211_MODE_11NG]   = { 1, 3, 4,  94, 0 },
          [IEEE80211_MODE_VHT_2GHZ]       = { 1, 3, 4,  94, 0 },
          [IEEE80211_MODE_VHT_5GHZ]       = { 1, 3, 4,  94, 0 },
  };
  static const struct phyParamType phyParamForAC_VO[IEEE80211_MODE_MAX] = {
          [IEEE80211_MODE_AUTO]   = { 1, 2, 3,  47, 0 },
          [IEEE80211_MODE_11A]    = { 1, 2, 3,  47, 0 },
          [IEEE80211_MODE_11B]    = { 1, 2, 3, 102, 0 },
          [IEEE80211_MODE_11G]    = { 1, 2, 3,  47, 0 },
          [IEEE80211_MODE_FH]     = { 1, 2, 3, 102, 0 },
          [IEEE80211_MODE_TURBO_A]= { 1, 2, 2,  47, 0 },
          [IEEE80211_MODE_TURBO_G]= { 1, 2, 2,  47, 0 },
          [IEEE80211_MODE_STURBO_A]={ 1, 2, 2,  47, 0 },
          [IEEE80211_MODE_HALF]   = { 1, 2, 3,  47, 0 },
          [IEEE80211_MODE_QUARTER]= { 1, 2, 3,  47, 0 },
          [IEEE80211_MODE_11NA]   = { 1, 2, 3,  47, 0 },
          [IEEE80211_MODE_11NG]   = { 1, 2, 3,  47, 0 },
          [IEEE80211_MODE_VHT_2GHZ]       = { 1, 2, 3,  47, 0 },
          [IEEE80211_MODE_VHT_5GHZ]       = { 1, 2, 3,  47, 0 },
  };
  
  static const struct phyParamType bssPhyParamForAC_BE[IEEE80211_MODE_MAX] = {
          [IEEE80211_MODE_AUTO]   = { 3, 4, 10,  0, 0 },
          [IEEE80211_MODE_11A]    = { 3, 4, 10,  0, 0 },
          [IEEE80211_MODE_11B]    = { 3, 4, 10,  0, 0 },
          [IEEE80211_MODE_11G]    = { 3, 4, 10,  0, 0 },
          [IEEE80211_MODE_FH]     = { 3, 4, 10,  0, 0 },
          [IEEE80211_MODE_TURBO_A]= { 2, 3, 10,  0, 0 },
          [IEEE80211_MODE_TURBO_G]= { 2, 3, 10,  0, 0 },
          [IEEE80211_MODE_STURBO_A]={ 2, 3, 10,  0, 0 },
          [IEEE80211_MODE_HALF]   = { 3, 4, 10,  0, 0 },
          [IEEE80211_MODE_QUARTER]= { 3, 4, 10,  0, 0 },
          [IEEE80211_MODE_11NA]   = { 3, 4, 10,  0, 0 },
          [IEEE80211_MODE_11NG]   = { 3, 4, 10,  0, 0 },
  };
  static const struct phyParamType bssPhyParamForAC_VI[IEEE80211_MODE_MAX] = {
          [IEEE80211_MODE_AUTO]   = { 2, 3, 4,  94, 0 },
          [IEEE80211_MODE_11A]    = { 2, 3, 4,  94, 0 },
          [IEEE80211_MODE_11B]    = { 2, 3, 4, 188, 0 },
          [IEEE80211_MODE_11G]    = { 2, 3, 4,  94, 0 },
          [IEEE80211_MODE_FH]     = { 2, 3, 4, 188, 0 },
          [IEEE80211_MODE_TURBO_A]= { 2, 2, 3,  94, 0 },
          [IEEE80211_MODE_TURBO_G]= { 2, 2, 3,  94, 0 },
          [IEEE80211_MODE_STURBO_A]={ 2, 2, 3,  94, 0 },
          [IEEE80211_MODE_HALF]   = { 2, 3, 4,  94, 0 },
          [IEEE80211_MODE_QUARTER]= { 2, 3, 4,  94, 0 },
          [IEEE80211_MODE_11NA]   = { 2, 3, 4,  94, 0 },
          [IEEE80211_MODE_11NG]   = { 2, 3, 4,  94, 0 },
  };
  static const struct phyParamType bssPhyParamForAC_VO[IEEE80211_MODE_MAX] = {
          [IEEE80211_MODE_AUTO]   = { 2, 2, 3,  47, 0 },
          [IEEE80211_MODE_11A]    = { 2, 2, 3,  47, 0 },
          [IEEE80211_MODE_11B]    = { 2, 2, 3, 102, 0 },
          [IEEE80211_MODE_11G]    = { 2, 2, 3,  47, 0 },
          [IEEE80211_MODE_FH]     = { 2, 2, 3, 102, 0 },
          [IEEE80211_MODE_TURBO_A]= { 1, 2, 2,  47, 0 },
          [IEEE80211_MODE_TURBO_G]= { 1, 2, 2,  47, 0 },
          [IEEE80211_MODE_STURBO_A]={ 1, 2, 2,  47, 0 },
          [IEEE80211_MODE_HALF]   = { 2, 2, 3,  47, 0 },
          [IEEE80211_MODE_QUARTER]= { 2, 2, 3,  47, 0 },
          [IEEE80211_MODE_11NA]   = { 2, 2, 3,  47, 0 },
          [IEEE80211_MODE_11NG]   = { 2, 2, 3,  47, 0 },
  };
  
  static void
  _setifsparams(struct wmeParams *wmep, const paramType *phy)
  {
          wmep->wmep_aifsn = phy->aifsn;
          wmep->wmep_logcwmin = phy->logcwmin;    
          wmep->wmep_logcwmax = phy->logcwmax;            
          wmep->wmep_txopLimit = phy->txopLimit;
  }
  
  static void
  setwmeparams(struct ieee80211vap *vap, const char *type, int ac,
          struct wmeParams *wmep, const paramType *phy)
  {
          wmep->wmep_acm = phy->acm;
          _setifsparams(wmep, phy);
  
          IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
              "set %s (%s) [acm %u aifsn %u logcwmin %u logcwmax %u txop %u]\n",
              ieee80211_wme_acnames[ac], type,
              wmep->wmep_acm, wmep->wmep_aifsn, wmep->wmep_logcwmin,
              wmep->wmep_logcwmax, wmep->wmep_txopLimit);
  }
  
  static void
  ieee80211_wme_initparams_locked(struct ieee80211vap *vap)
  {
          struct ieee80211com *ic = vap->iv_ic;
          struct ieee80211_wme_state *wme = &ic->ic_wme;
          const paramType *pPhyParam, *pBssPhyParam;
          struct wmeParams *wmep;
          enum ieee80211_phymode mode;
          int i;
  
          IEEE80211_LOCK_ASSERT(ic);
  
          if ((ic->ic_caps & IEEE80211_C_WME) == 0 || ic->ic_nrunning > 1)
                  return;
  
          /*
           * Clear the wme cap_info field so a qoscount from a previous
           * vap doesn't confuse later code which only parses the beacon
           * field and updates hardware when said field changes.
           * Otherwise the hardware is programmed with defaults, not what
           * the beacon actually announces.
           *
           * Note that we can't ever have 0xff as an actual value;
           * the only valid values are 0..15.
           */
          wme->wme_wmeChanParams.cap_info = 0xfe;
  
          /*
           * Select mode; we can be called early in which case we
           * always use auto mode.  We know we'll be called when
           * entering the RUN state with bsschan setup properly
           * so state will eventually get set correctly
           */
          if (ic->ic_bsschan != IEEE80211_CHAN_ANYC)
                  mode = ieee80211_chan2mode(ic->ic_bsschan);
          else
                  mode = IEEE80211_MODE_AUTO;
          for (i = 0; i < WME_NUM_AC; i++) {
                  switch (i) {
                  case WME_AC_BK:
                          pPhyParam = &phyParamForAC_BK[mode];
                          pBssPhyParam = &phyParamForAC_BK[mode];
                          break;
                  case WME_AC_VI:
                          pPhyParam = &phyParamForAC_VI[mode];
                          pBssPhyParam = &bssPhyParamForAC_VI[mode];
                          break;
                  case WME_AC_VO:
                          pPhyParam = &phyParamForAC_VO[mode];
                          pBssPhyParam = &bssPhyParamForAC_VO[mode];
                          break;
                  case WME_AC_BE:
                  default:
                          pPhyParam = &phyParamForAC_BE[mode];
                          pBssPhyParam = &bssPhyParamForAC_BE[mode];
                          break;
                  }
                  wmep = &wme->wme_wmeChanParams.cap_wmeParams[i];
                  if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
                          setwmeparams(vap, "chan", i, wmep, pPhyParam);
                  } else {
                          setwmeparams(vap, "chan", i, wmep, pBssPhyParam);
                  }       
                  wmep = &wme->wme_wmeBssChanParams.cap_wmeParams[i];
                  setwmeparams(vap, "bss ", i, wmep, pBssPhyParam);
          }
          /* NB: check ic_bss to avoid NULL deref on initial attach */
          if (vap->iv_bss != NULL) {
                  /*
                   * Calculate aggressive mode switching threshold based
                   * on beacon interval.  This doesn't need locking since
                   * we're only called before entering the RUN state at
                   * which point we start sending beacon frames.
                   */
                  wme->wme_hipri_switch_thresh =
                          (HIGH_PRI_SWITCH_THRESH * vap->iv_bss->ni_intval) / 100;
                  wme->wme_flags &= ~WME_F_AGGRMODE;
                  ieee80211_wme_updateparams(vap);
          }
  }
  
  void
  ieee80211_wme_initparams(struct ieee80211vap *vap)
  {
          struct ieee80211com *ic = vap->iv_ic;
  
          IEEE80211_LOCK(ic);
          ieee80211_wme_initparams_locked(vap);
          IEEE80211_UNLOCK(ic);
  }
  
  /*
   * Update WME parameters for ourself and the BSS.
   */
  void
  ieee80211_wme_updateparams_locked(struct ieee80211vap *vap)
  {
          static const paramType aggrParam[IEEE80211_MODE_MAX] = {
              [IEEE80211_MODE_AUTO]       = { 2, 4, 10, 64, 0 },
              [IEEE80211_MODE_11A]        = { 2, 4, 10, 64, 0 },
              [IEEE80211_MODE_11B]        = { 2, 5, 10, 64, 0 },
              [IEEE80211_MODE_11G]        = { 2, 4, 10, 64, 0 },
              [IEEE80211_MODE_FH]         = { 2, 5, 10, 64, 0 },
              [IEEE80211_MODE_TURBO_A]    = { 1, 3, 10, 64, 0 },
              [IEEE80211_MODE_TURBO_G]    = { 1, 3, 10, 64, 0 },
              [IEEE80211_MODE_STURBO_A]   = { 1, 3, 10, 64, 0 },
              [IEEE80211_MODE_HALF]       = { 2, 4, 10, 64, 0 },
              [IEEE80211_MODE_QUARTER]    = { 2, 4, 10, 64, 0 },
              [IEEE80211_MODE_11NA]       = { 2, 4, 10, 64, 0 },  /* XXXcheck*/
              [IEEE80211_MODE_11NG]       = { 2, 4, 10, 64, 0 },  /* XXXcheck*/
              [IEEE80211_MODE_VHT_2GHZ]   = { 2, 4, 10, 64, 0 },  /* XXXcheck*/
              [IEEE80211_MODE_VHT_5GHZ]   = { 2, 4, 10, 64, 0 },  /* XXXcheck*/
          };
          struct ieee80211com *ic = vap->iv_ic;
          struct ieee80211_wme_state *wme = &ic->ic_wme;
          const struct wmeParams *wmep;
          struct wmeParams *chanp, *bssp;
          enum ieee80211_phymode mode;
          int i;
          int do_aggrmode = 0;
  
          /*
           * Set up the channel access parameters for the physical
           * device.  First populate the configured settings.
           */
          for (i = 0; i < WME_NUM_AC; i++) {
                  chanp = &wme->wme_chanParams.cap_wmeParams[i];
                  wmep = &wme->wme_wmeChanParams.cap_wmeParams[i];
                  chanp->wmep_aifsn = wmep->wmep_aifsn;
                  chanp->wmep_logcwmin = wmep->wmep_logcwmin;
                  chanp->wmep_logcwmax = wmep->wmep_logcwmax;
                  chanp->wmep_txopLimit = wmep->wmep_txopLimit;
  
                  chanp = &wme->wme_bssChanParams.cap_wmeParams[i];
                  wmep = &wme->wme_wmeBssChanParams.cap_wmeParams[i];
                  chanp->wmep_aifsn = wmep->wmep_aifsn;
                  chanp->wmep_logcwmin = wmep->wmep_logcwmin;
                  chanp->wmep_logcwmax = wmep->wmep_logcwmax;
                  chanp->wmep_txopLimit = wmep->wmep_txopLimit;
          }
  
          /*
           * Select mode; we can be called early in which case we
           * always use auto mode.  We know we'll be called when
           * entering the RUN state with bsschan setup properly
           * so state will eventually get set correctly
           */
          if (ic->ic_bsschan != IEEE80211_CHAN_ANYC)
                  mode = ieee80211_chan2mode(ic->ic_bsschan);
          else
                  mode = IEEE80211_MODE_AUTO;
  
          /*
           * This implements aggressive mode as found in certain
           * vendors' AP's.  When there is significant high
           * priority (VI/VO) traffic in the BSS throttle back BE
           * traffic by using conservative parameters.  Otherwise
           * BE uses aggressive params to optimize performance of
           * legacy/non-QoS traffic.
           */
  
          /* Hostap? Only if aggressive mode is enabled */
          if (vap->iv_opmode == IEEE80211_M_HOSTAP &&
               (wme->wme_flags & WME_F_AGGRMODE) != 0)
                  do_aggrmode = 1;
  
          /*
           * Station? Only if we're in a non-QoS BSS.
           */
          else if ((vap->iv_opmode == IEEE80211_M_STA &&
               (vap->iv_bss->ni_flags & IEEE80211_NODE_QOS) == 0))
                  do_aggrmode = 1;
  
          /*
           * IBSS? Only if we we have WME enabled.
           */
          else if ((vap->iv_opmode == IEEE80211_M_IBSS) &&
              (vap->iv_flags & IEEE80211_F_WME))
                  do_aggrmode = 1;
  
          /*
           * If WME is disabled on this VAP, default to aggressive mode
           * regardless of the configuration.
           */
          if ((vap->iv_flags & IEEE80211_F_WME) == 0)
                  do_aggrmode = 1;
  
          /* XXX WDS? */
  
          /* XXX MBSS? */
          
          if (do_aggrmode) {
                  chanp = &wme->wme_chanParams.cap_wmeParams[WME_AC_BE];
                  bssp = &wme->wme_bssChanParams.cap_wmeParams[WME_AC_BE];
  
                  chanp->wmep_aifsn = bssp->wmep_aifsn = aggrParam[mode].aifsn;
                  chanp->wmep_logcwmin = bssp->wmep_logcwmin =
                      aggrParam[mode].logcwmin;
                  chanp->wmep_logcwmax = bssp->wmep_logcwmax =
                      aggrParam[mode].logcwmax;
                  chanp->wmep_txopLimit = bssp->wmep_txopLimit =
                      (vap->iv_flags & IEEE80211_F_BURST) ?
                          aggrParam[mode].txopLimit : 0;          
                  IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
                      "update %s (chan+bss) [acm %u aifsn %u logcwmin %u "
                      "logcwmax %u txop %u]\n", ieee80211_wme_acnames[WME_AC_BE],
                      chanp->wmep_acm, chanp->wmep_aifsn, chanp->wmep_logcwmin,
                      chanp->wmep_logcwmax, chanp->wmep_txopLimit);
          }
  
  
          /*
           * Change the contention window based on the number of associated
           * stations.  If the number of associated stations is 1 and
           * aggressive mode is enabled, lower the contention window even
           * further.
           */
          if (vap->iv_opmode == IEEE80211_M_HOSTAP &&
              vap->iv_sta_assoc < 2 && (wme->wme_flags & WME_F_AGGRMODE) != 0) {
                  static const uint8_t logCwMin[IEEE80211_MODE_MAX] = {
                      [IEEE80211_MODE_AUTO]       = 3,
                      [IEEE80211_MODE_11A]        = 3,
                      [IEEE80211_MODE_11B]        = 4,
                      [IEEE80211_MODE_11G]        = 3,
                      [IEEE80211_MODE_FH]         = 4,
                      [IEEE80211_MODE_TURBO_A]    = 3,
                      [IEEE80211_MODE_TURBO_G]    = 3,
                      [IEEE80211_MODE_STURBO_A]   = 3,
                      [IEEE80211_MODE_HALF]       = 3,
                      [IEEE80211_MODE_QUARTER]    = 3,
                      [IEEE80211_MODE_11NA]       = 3,
                      [IEEE80211_MODE_11NG]       = 3,
                      [IEEE80211_MODE_VHT_2GHZ]   = 3,
                      [IEEE80211_MODE_VHT_5GHZ]   = 3,
                  };
                  chanp = &wme->wme_chanParams.cap_wmeParams[WME_AC_BE];
                  bssp = &wme->wme_bssChanParams.cap_wmeParams[WME_AC_BE];
  
                  chanp->wmep_logcwmin = bssp->wmep_logcwmin = logCwMin[mode];
                  IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
                      "update %s (chan+bss) logcwmin %u\n",
                      ieee80211_wme_acnames[WME_AC_BE], chanp->wmep_logcwmin);
          }
  
          /* schedule the deferred WME update */
          ieee80211_runtask(ic, &vap->iv_wme_task);
  
          IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
              "%s: WME params updated, cap_info 0x%x\n", __func__,
              vap->iv_opmode == IEEE80211_M_STA ?
                  wme->wme_wmeChanParams.cap_info :
                  wme->wme_bssChanParams.cap_info);
  }
  
  void
  ieee80211_wme_updateparams(struct ieee80211vap *vap)
  {
          struct ieee80211com *ic = vap->iv_ic;
  
          if (ic->ic_caps & IEEE80211_C_WME) {
                  IEEE80211_LOCK(ic);
                  ieee80211_wme_updateparams_locked(vap);
                  IEEE80211_UNLOCK(ic);
          }
  }
  
  /*
   * Fetch the WME parameters for the given VAP.
   *
   * When net80211 grows p2p, etc support, this may return different
   * parameters for each VAP.
   */
  void
  ieee80211_wme_vap_getparams(struct ieee80211vap *vap, struct chanAccParams *wp)
  {
  
          memcpy(wp, &vap->iv_ic->ic_wme.wme_chanParams, sizeof(*wp));
  }
  
  /*
   * For NICs which only support one set of WME parameters (ie, softmac NICs)
   * there may be different VAP WME parameters but only one is "active".
   * This returns the "NIC" WME parameters for the currently active
   * context.
   */
  void
  ieee80211_wme_ic_getparams(struct ieee80211com *ic, struct chanAccParams *wp)
  {
  
          memcpy(wp, &ic->ic_wme.wme_chanParams, sizeof(*wp));
  }
  
  /*
   * Return whether to use QoS on a given WME queue.
   *
   * This is intended to be called from the transmit path of softmac drivers
   * which are setting NoAck bits in transmit descriptors.
   *
   * Ideally this would be set in some transmit field before the packet is
   * queued to the driver but net80211 isn't quite there yet.
   */
  int
  ieee80211_wme_vap_ac_is_noack(struct ieee80211vap *vap, int ac)
  {
          /* Bounds/sanity check */
          if (ac < 0 || ac >= WME_NUM_AC)
                  return (0);
  
          /* Again, there's only one global context for now */
          return (!! vap->iv_ic->ic_wme.wme_chanParams.cap_wmeParams[ac].wmep_noackPolicy);
  }
  
  static void
  parent_updown(void *arg, int npending)
  {
          struct ieee80211com *ic = arg;
  
          ic->ic_parent(ic);
  }
  
  static void
  update_mcast(void *arg, int npending)
  {
          struct ieee80211com *ic = arg;
  
          ic->ic_update_mcast(ic);
  }
  
  static void
  update_promisc(void *arg, int npending)
  {
          struct ieee80211com *ic = arg;
  
          ic->ic_update_promisc(ic);
  }
  
  static void
  update_channel(void *arg, int npending)
  {
          struct ieee80211com *ic = arg;
  
          ic->ic_set_channel(ic);
          ieee80211_radiotap_chan_change(ic);
  }
  
  static void
  update_chw(void *arg, int npending)
  {
          struct ieee80211com *ic = arg;
  
          /*
           * XXX should we defer the channel width _config_ update until now?
           */
          ic->ic_update_chw(ic);
  }
  
  /*
   * Deferred WME parameter and beacon update.
   *
   * In preparation for per-VAP WME configuration, call the VAP
   * method if the VAP requires it.  Otherwise, just call the
   * older global method.  There isn't a per-VAP WME configuration
   * just yet so for now just use the global configuration.
   */
  static void
  vap_update_wme(void *arg, int npending)
  {
          struct ieee80211vap *vap = arg;
          struct ieee80211com *ic = vap->iv_ic;
          struct ieee80211_wme_state *wme = &ic->ic_wme;
  
          /* Driver update */
          if (vap->iv_wme_update != NULL)
                  vap->iv_wme_update(vap,
                      ic->ic_wme.wme_chanParams.cap_wmeParams);
          else
                  ic->ic_wme.wme_update(ic);
  
          IEEE80211_LOCK(ic);
          /*
           * Arrange for the beacon update.
           *
           * XXX what about MBSS, WDS?
           */
          if (vap->iv_opmode == IEEE80211_M_HOSTAP
              || vap->iv_opmode == IEEE80211_M_IBSS) {
                  /*
                   * Arrange for a beacon update and bump the parameter
                   * set number so associated stations load the new values.
                   */
                  wme->wme_bssChanParams.cap_info =
                          (wme->wme_bssChanParams.cap_info+1) & WME_QOSINFO_COUNT;
                  ieee80211_beacon_notify(vap, IEEE80211_BEACON_WME);
          }
          IEEE80211_UNLOCK(ic);
  }
  
  static void
  restart_vaps(void *arg, int npending)
  {
          struct ieee80211com *ic = arg;
  
          ieee80211_suspend_all(ic);
          ieee80211_resume_all(ic);
  }
  
  /*
   * Block until the parent is in a known state.  This is
   * used after any operations that dispatch a task (e.g.
   * to auto-configure the parent device up/down).
   */
  void
  ieee80211_waitfor_parent(struct ieee80211com *ic)
  {
          taskqueue_block(ic->ic_tq);
          ieee80211_draintask(ic, &ic->ic_parent_task);
          ieee80211_draintask(ic, &ic->ic_mcast_task);
          ieee80211_draintask(ic, &ic->ic_promisc_task);
          ieee80211_draintask(ic, &ic->ic_chan_task);
          ieee80211_draintask(ic, &ic->ic_bmiss_task);
          ieee80211_draintask(ic, &ic->ic_chw_task);
          taskqueue_unblock(ic->ic_tq);
  }
  
  /*
   * Check to see whether the current channel needs reset.
   *
   * Some devices don't handle being given an invalid channel
   * in their operating mode very well (eg wpi(4) will throw a
   * firmware exception.)
   *
   * Return 0 if we're ok, 1 if the channel needs to be reset.
   *
   * See PR kern/202502.
   */
  static int
  ieee80211_start_check_reset_chan(struct ieee80211vap *vap)
  {
          struct ieee80211com *ic = vap->iv_ic;
  
          if ((vap->iv_opmode == IEEE80211_M_IBSS &&
               IEEE80211_IS_CHAN_NOADHOC(ic->ic_curchan)) ||
              (vap->iv_opmode == IEEE80211_M_HOSTAP &&
               IEEE80211_IS_CHAN_NOHOSTAP(ic->ic_curchan)))
                  return (1);
          return (0);
  }
  
  /*
   * Reset the curchan to a known good state.
   */
  static void
  ieee80211_start_reset_chan(struct ieee80211vap *vap)
  {
          struct ieee80211com *ic = vap->iv_ic;
  
          ic->ic_curchan = &ic->ic_channels[0];
  }
  
  /*
   * Start a vap running.  If this is the first vap to be
   * set running on the underlying device then we
   * automatically bring the device up.
   */
  void
  ieee80211_start_locked(struct ieee80211vap *vap)
  {
          struct ifnet *ifp = vap->iv_ifp;
          struct ieee80211com *ic = vap->iv_ic;
  
          IEEE80211_LOCK_ASSERT(ic);
  
          IEEE80211_DPRINTF(vap,
                  IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
                  "start running, %d vaps running\n", ic->ic_nrunning);
  
          if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
                  /*
                   * Mark us running.  Note that it's ok to do this first;
                   * if we need to bring the parent device up we defer that
                   * to avoid dropping the com lock.  We expect the device
                   * to respond to being marked up by calling back into us
                   * through ieee80211_start_all at which point we'll come
                   * back in here and complete the work.
                   */
                  ifp->if_drv_flags |= IFF_DRV_RUNNING;
                  ieee80211_notify_ifnet_change(vap);
  
                  /*
                   * We are not running; if this we are the first vap
                   * to be brought up auto-up the parent if necessary.
                   */
                  if (ic->ic_nrunning++ == 0) {
  
                          /* reset the channel to a known good channel */
                          if (ieee80211_start_check_reset_chan(vap))
                                  ieee80211_start_reset_chan(vap);
  
                          IEEE80211_DPRINTF(vap,
                              IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
                              "%s: up parent %s\n", __func__, ic->ic_name);
                          ieee80211_runtask(ic, &ic->ic_parent_task);
                          return;
                  }
          }
          /*
           * If the parent is up and running, then kick the
           * 802.11 state machine as appropriate.
           */
          if (vap->iv_roaming != IEEE80211_ROAMING_MANUAL) {
                  if (vap->iv_opmode == IEEE80211_M_STA) {
  #if 0
                          /* XXX bypasses scan too easily; disable for now */
                          /*
                           * Try to be intelligent about clocking the state
                           * machine.  If we're currently in RUN state then
                           * we should be able to apply any new state/parameters
                           * simply by re-associating.  Otherwise we need to
                           * re-scan to select an appropriate ap.
                           */ 
                          if (vap->iv_state >= IEEE80211_S_RUN)
                                  ieee80211_new_state_locked(vap,
                                      IEEE80211_S_ASSOC, 1);
                          else
  #endif
                                  ieee80211_new_state_locked(vap,
                                      IEEE80211_S_SCAN, 0);
                  } else {
                          /*
                           * For monitor+wds mode there's nothing to do but
                           * start running.  Otherwise if this is the first
                           * vap to be brought up, start a scan which may be
                           * preempted if the station is locked to a particular
                           * channel.
                           */
                          vap->iv_flags_ext |= IEEE80211_FEXT_REINIT;
                          if (vap->iv_opmode == IEEE80211_M_MONITOR ||
                              vap->iv_opmode == IEEE80211_M_WDS)
                                  ieee80211_new_state_locked(vap,
                                      IEEE80211_S_RUN, -1);
                          else
                                  ieee80211_new_state_locked(vap,
                                      IEEE80211_S_SCAN, 0);
                  }
          }
  }
  
  /*
   * Start a single vap.
   */
  void
  ieee80211_init(void *arg)
  {
          struct ieee80211vap *vap = arg;
  
          IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
              "%s\n", __func__);
  
          IEEE80211_LOCK(vap->iv_ic);
          ieee80211_start_locked(vap);
          IEEE80211_UNLOCK(vap->iv_ic);
  }
  
  /*
   * Start all runnable vap's on a device.
   */
  void
  ieee80211_start_all(struct ieee80211com *ic)
  {
          struct ieee80211vap *vap;
  
          IEEE80211_LOCK(ic);
          TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
                  struct ifnet *ifp = vap->iv_ifp;
                  if (IFNET_IS_UP_RUNNING(ifp))   /* NB: avoid recursion */
                          ieee80211_start_locked(vap);
          }
          IEEE80211_UNLOCK(ic);
  }
  
  /*
   * Stop a vap.  We force it down using the state machine
   * then mark it's ifnet not running.  If this is the last
   * vap running on the underlying device then we close it
   * too to insure it will be properly initialized when the
   * next vap is brought up.
   */
  void
  ieee80211_stop_locked(struct ieee80211vap *vap)
  {
          struct ieee80211com *ic = vap->iv_ic;
          struct ifnet *ifp = vap->iv_ifp;
  
          IEEE80211_LOCK_ASSERT(ic);
  
          IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
              "stop running, %d vaps running\n", ic->ic_nrunning);
  
          ieee80211_new_state_locked(vap, IEEE80211_S_INIT, -1);
          if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
                  ifp->if_drv_flags &= ~IFF_DRV_RUNNING;  /* mark us stopped */
                  ieee80211_notify_ifnet_change(vap);
                  if (--ic->ic_nrunning == 0) {
                          IEEE80211_DPRINTF(vap,
                              IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
                              "down parent %s\n", ic->ic_name);
                          ieee80211_runtask(ic, &ic->ic_parent_task);
                  }
          }
  }
  
  void
  ieee80211_stop(struct ieee80211vap *vap)
  {
          struct ieee80211com *ic = vap->iv_ic;
  
          IEEE80211_LOCK(ic);
          ieee80211_stop_locked(vap);
          IEEE80211_UNLOCK(ic);
  }
  
  /*
   * Stop all vap's running on a device.
   */
  void
  ieee80211_stop_all(struct ieee80211com *ic)
  {
          struct ieee80211vap *vap;
  
          IEEE80211_LOCK(ic);
          TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
                  struct ifnet *ifp = vap->iv_ifp;
                  if (IFNET_IS_UP_RUNNING(ifp))   /* NB: avoid recursion */
                          ieee80211_stop_locked(vap);
          }
          IEEE80211_UNLOCK(ic);
  
          ieee80211_waitfor_parent(ic);
  }
  
  /*
   * Stop all vap's running on a device and arrange
   * for those that were running to be resumed.
   */
  void
  ieee80211_suspend_all(struct ieee80211com *ic)
  {
          struct ieee80211vap *vap;
  
          IEEE80211_LOCK(ic);
          TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
                  struct ifnet *ifp = vap->iv_ifp;
                  if (IFNET_IS_UP_RUNNING(ifp)) { /* NB: avoid recursion */
                          vap->iv_flags_ext |= IEEE80211_FEXT_RESUME;
                          ieee80211_stop_locked(vap);
                  }
          }
          IEEE80211_UNLOCK(ic);
  
          ieee80211_waitfor_parent(ic);
  }
  
  /*
   * Start all vap's marked for resume.
   */
  void
  ieee80211_resume_all(struct ieee80211com *ic)
  {
          struct ieee80211vap *vap;
  
          IEEE80211_LOCK(ic);
          TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
                  struct ifnet *ifp = vap->iv_ifp;
                  if (!IFNET_IS_UP_RUNNING(ifp) &&
                      (vap->iv_flags_ext & IEEE80211_FEXT_RESUME)) {
                          vap->iv_flags_ext &= ~IEEE80211_FEXT_RESUME;
                          ieee80211_start_locked(vap);
                  }
          }
          IEEE80211_UNLOCK(ic);
  }
  
  /*
   * Restart all vap's running on a device.
   */
  void
  ieee80211_restart_all(struct ieee80211com *ic)
  {
          /*
           * NB: do not use ieee80211_runtask here, we will
           * block & drain net80211 taskqueue.
           */
          taskqueue_enqueue(taskqueue_thread, &ic->ic_restart_task);
  }
  
  void
  ieee80211_beacon_miss(struct ieee80211com *ic)
  {
          IEEE80211_LOCK(ic);
          if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
                  /* Process in a taskq, the handler may reenter the driver */
                  ieee80211_runtask(ic, &ic->ic_bmiss_task);
          }
          IEEE80211_UNLOCK(ic);
  }
  
  static void
  beacon_miss(void *arg, int npending)
  {
          struct ieee80211com *ic = arg;
          struct ieee80211vap *vap;
  
          IEEE80211_LOCK(ic);
          TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
                  /*
                   * We only pass events through for sta vap's in RUN+ state;
                   * may be too restrictive but for now this saves all the
                   * handlers duplicating these checks.
                   */
                  if (vap->iv_opmode == IEEE80211_M_STA &&
                      vap->iv_state >= IEEE80211_S_RUN &&
                      vap->iv_bmiss != NULL)
                          vap->iv_bmiss(vap);
          }
          IEEE80211_UNLOCK(ic);
  }
  
  static void
  beacon_swmiss(void *arg, int npending)
  {
          struct ieee80211vap *vap = arg;
          struct ieee80211com *ic = vap->iv_ic;
  
          IEEE80211_LOCK(ic);
          if (vap->iv_state >= IEEE80211_S_RUN) {
                  /* XXX Call multiple times if npending > zero? */
                  vap->iv_bmiss(vap);
          }
          IEEE80211_UNLOCK(ic);
  }
  
  /*
   * Software beacon miss handling.  Check if any beacons
   * were received in the last period.  If not post a
   * beacon miss; otherwise reset the counter.
   */
  void
  ieee80211_swbmiss(void *arg)
  {
          struct ieee80211vap *vap = arg;
          struct ieee80211com *ic = vap->iv_ic;
  
          IEEE80211_LOCK_ASSERT(ic);
  
          KASSERT(vap->iv_state >= IEEE80211_S_RUN,
              ("wrong state %d", vap->iv_state));
  
          if (ic->ic_flags & IEEE80211_F_SCAN) {
                  /*
                   * If scanning just ignore and reset state.  If we get a
                   * bmiss after coming out of scan because we haven't had
                   * time to receive a beacon then we should probe the AP
                   * before posting a real bmiss (unless iv_bmiss_max has
                   * been artifiically lowered).  A cleaner solution might
                   * be to disable the timer on scan start/end but to handle
                   * case of multiple sta vap's we'd need to disable the
                   * timers of all affected vap's.
                   */
                  vap->iv_swbmiss_count = 0;
          } else if (vap->iv_swbmiss_count == 0) {
                  if (vap->iv_bmiss != NULL)
                          ieee80211_runtask(ic, &vap->iv_swbmiss_task);
          } else
                  vap->iv_swbmiss_count = 0;
          callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period,
                  ieee80211_swbmiss, vap);
  }
  
  /*
   * Start an 802.11h channel switch.  We record the parameters,
   * mark the operation pending, notify each vap through the
   * beacon update mechanism so it can update the beacon frame
   * contents, and then switch vap's to CSA state to block outbound
   * traffic.  Devices that handle CSA directly can use the state
   * switch to do the right thing so long as they call
   * ieee80211_csa_completeswitch when it's time to complete the
   * channel change.  Devices that depend on the net80211 layer can
   * use ieee80211_beacon_update to handle the countdown and the
   * channel switch.
   */
  void
  ieee80211_csa_startswitch(struct ieee80211com *ic,
          struct ieee80211_channel *c, int mode, int count)
  {
          struct ieee80211vap *vap;
  
          IEEE80211_LOCK_ASSERT(ic);
  
          ic->ic_csa_newchan = c;
          ic->ic_csa_mode = mode;
          ic->ic_csa_count = count;
          ic->ic_flags |= IEEE80211_F_CSAPENDING;
          TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
                  if (vap->iv_opmode == IEEE80211_M_HOSTAP ||
                      vap->iv_opmode == IEEE80211_M_IBSS ||
                      vap->iv_opmode == IEEE80211_M_MBSS)
                          ieee80211_beacon_notify(vap, IEEE80211_BEACON_CSA);
                  /* switch to CSA state to block outbound traffic */
                  if (vap->iv_state == IEEE80211_S_RUN)
                          ieee80211_new_state_locked(vap, IEEE80211_S_CSA, 0);
          }
          ieee80211_notify_csa(ic, c, mode, count);
  }
  
  /*
   * Complete the channel switch by transitioning all CSA VAPs to RUN.
   * This is called by both the completion and cancellation functions
   * so each VAP is placed back in the RUN state and can thus transmit.
   */
  static void
  csa_completeswitch(struct ieee80211com *ic)
  {
          struct ieee80211vap *vap;
  
          ic->ic_csa_newchan = NULL;
          ic->ic_flags &= ~IEEE80211_F_CSAPENDING;
  
          TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
                  if (vap->iv_state == IEEE80211_S_CSA)
                          ieee80211_new_state_locked(vap, IEEE80211_S_RUN, 0);
  }
  
  /*
   * Complete an 802.11h channel switch started by ieee80211_csa_startswitch.
   * We clear state and move all vap's in CSA state to RUN state
   * so they can again transmit.
   *
   * Although this may not be completely correct, update the BSS channel
   * for each VAP to the newly configured channel. The setcurchan sets
   * the current operating channel for the interface (so the radio does
   * switch over) but the VAP BSS isn't updated, leading to incorrectly
   * reported information via ioctl.
   */
  void
  ieee80211_csa_completeswitch(struct ieee80211com *ic)
  {
          struct ieee80211vap *vap;
  
          IEEE80211_LOCK_ASSERT(ic);
  
          KASSERT(ic->ic_flags & IEEE80211_F_CSAPENDING, ("csa not pending"));
  
          ieee80211_setcurchan(ic, ic->ic_csa_newchan);
          TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
                  if (vap->iv_state == IEEE80211_S_CSA)
                          vap->iv_bss->ni_chan = ic->ic_curchan;
  
          csa_completeswitch(ic);
  }
  
  /*
   * Cancel an 802.11h channel switch started by ieee80211_csa_startswitch.
   * We clear state and move all vap's in CSA state to RUN state
   * so they can again transmit.
   */
  void
  ieee80211_csa_cancelswitch(struct ieee80211com *ic)
  {
          IEEE80211_LOCK_ASSERT(ic);
  
          csa_completeswitch(ic);
  }
  
  /*
   * Complete a DFS CAC started by ieee80211_dfs_cac_start.
   * We clear state and move all vap's in CAC state to RUN state.
   */
  void
  ieee80211_cac_completeswitch(struct ieee80211vap *vap0)
  {
          struct ieee80211com *ic = vap0->iv_ic;
          struct ieee80211vap *vap;
  
          IEEE80211_LOCK(ic);
          /*
           * Complete CAC state change for lead vap first; then
           * clock all the other vap's waiting.
           */
          KASSERT(vap0->iv_state == IEEE80211_S_CAC,
              ("wrong state %d", vap0->iv_state));
          ieee80211_new_state_locked(vap0, IEEE80211_S_RUN, 0);
  
          TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
                  if (vap->iv_state == IEEE80211_S_CAC && vap != vap0)
                          ieee80211_new_state_locked(vap, IEEE80211_S_RUN, 0);
          IEEE80211_UNLOCK(ic);
  }
  
  /*
   * Force all vap's other than the specified vap to the INIT state
   * and mark them as waiting for a scan to complete.  These vaps
   * will be brought up when the scan completes and the scanning vap
   * reaches RUN state by wakeupwaiting.
   */
  static void
  markwaiting(struct ieee80211vap *vap0)
  {
          struct ieee80211com *ic = vap0->iv_ic;
          struct ieee80211vap *vap;
  
          IEEE80211_LOCK_ASSERT(ic);
  
          /*
           * A vap list entry can not disappear since we are running on the
           * taskqueue and a vap destroy will queue and drain another state
           * change task.
           */
          TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
                  if (vap == vap0)
                          continue;
                  if (vap->iv_state != IEEE80211_S_INIT) {
                          /* NB: iv_newstate may drop the lock */
                          vap->iv_newstate(vap, IEEE80211_S_INIT, 0);
                          IEEE80211_LOCK_ASSERT(ic);
                          vap->iv_flags_ext |= IEEE80211_FEXT_SCANWAIT;
                  }
          }
  }
  
  /*
   * Wakeup all vap's waiting for a scan to complete.  This is the
   * companion to markwaiting (above) and is used to coordinate
   * multiple vaps scanning.
   * This is called from the state taskqueue.
   */
  static void
  wakeupwaiting(struct ieee80211vap *vap0)
  {
          struct ieee80211com *ic = vap0->iv_ic;
          struct ieee80211vap *vap;
  
          IEEE80211_LOCK_ASSERT(ic);
  
          /*
           * A vap list entry can not disappear since we are running on the
           * taskqueue and a vap destroy will queue and drain another state
           * change task.
           */
          TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
                  if (vap == vap0)
                          continue;
                  if (vap->iv_flags_ext & IEEE80211_FEXT_SCANWAIT) {
                          vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANWAIT;
                          /* NB: sta's cannot go INIT->RUN */
                          /* NB: iv_newstate may drop the lock */
                          vap->iv_newstate(vap,
                              vap->iv_opmode == IEEE80211_M_STA ?
                                  IEEE80211_S_SCAN : IEEE80211_S_RUN, 0);
                          IEEE80211_LOCK_ASSERT(ic);
                  }
          }
  }
  
  /*
   * Handle post state change work common to all operating modes.
   */
  static void
  ieee80211_newstate_cb(void *xvap, int npending)
  {
          struct ieee80211vap *vap = xvap;
          struct ieee80211com *ic = vap->iv_ic;
          enum ieee80211_state nstate, ostate;
          int arg, rc;
  
          IEEE80211_LOCK(ic);
          nstate = vap->iv_nstate;
          arg = vap->iv_nstate_arg;
  
          if (vap->iv_flags_ext & IEEE80211_FEXT_REINIT) {
                  /*
                   * We have been requested to drop back to the INIT before
                   * proceeding to the new state.
                   */
                  /* Deny any state changes while we are here. */
                  vap->iv_nstate = IEEE80211_S_INIT;
                  IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
                      "%s: %s -> %s arg %d\n", __func__,
                      ieee80211_state_name[vap->iv_state],
                      ieee80211_state_name[vap->iv_nstate], arg);
                  vap->iv_newstate(vap, vap->iv_nstate, 0);
                  IEEE80211_LOCK_ASSERT(ic);
                  vap->iv_flags_ext &= ~(IEEE80211_FEXT_REINIT |
                      IEEE80211_FEXT_STATEWAIT);
                  /* enqueue new state transition after cancel_scan() task */
                  ieee80211_new_state_locked(vap, nstate, arg);
                  goto done;
          }
  
          ostate = vap->iv_state;
          if (nstate == IEEE80211_S_SCAN && ostate != IEEE80211_S_INIT) {
                  /*
                   * SCAN was forced; e.g. on beacon miss.  Force other running
                   * vap's to INIT state and mark them as waiting for the scan to
                   * complete.  This insures they don't interfere with our
                   * scanning.  Since we are single threaded the vaps can not
                   * transition again while we are executing.
                   *
                   * XXX not always right, assumes ap follows sta
                   */
                  markwaiting(vap);
          }
          IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
              "%s: %s -> %s arg %d\n", __func__,
              ieee80211_state_name[ostate], ieee80211_state_name[nstate], arg);
  
          rc = vap->iv_newstate(vap, nstate, arg);
          IEEE80211_LOCK_ASSERT(ic);
          vap->iv_flags_ext &= ~IEEE80211_FEXT_STATEWAIT;
          if (rc != 0) {
                  /* State transition failed */
                  KASSERT(rc != EINPROGRESS, ("iv_newstate was deferred"));
                  KASSERT(nstate != IEEE80211_S_INIT,
                      ("INIT state change failed"));
                  IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
                      "%s: %s returned error %d\n", __func__,
                      ieee80211_state_name[nstate], rc);
                  goto done;
          }
  
          /* No actual transition, skip post processing */
          if (ostate == nstate)
                  goto done;
  
          if (nstate == IEEE80211_S_RUN) {
                  /*
                   * OACTIVE may be set on the vap if the upper layer
                   * tried to transmit (e.g. IPv6 NDP) before we reach
                   * RUN state.  Clear it and restart xmit.
                   *
                   * Note this can also happen as a result of SLEEP->RUN
                   * (i.e. coming out of power save mode).
                   */
                  vap->iv_ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  
                  /*
                   * XXX TODO Kick-start a VAP queue - this should be a method!
                   */
  
                  /* bring up any vaps waiting on us */
                  wakeupwaiting(vap);
          } else if (nstate == IEEE80211_S_INIT) {
                  /*
                   * Flush the scan cache if we did the last scan (XXX?)
                   * and flush any frames on send queues from this vap.
                   * Note the mgt q is used only for legacy drivers and
                   * will go away shortly.
                   */
                  ieee80211_scan_flush(vap);
  
                  /*
                   * XXX TODO: ic/vap queue flush
                   */
          }
  done:
          IEEE80211_UNLOCK(ic);
  }
  
  /*
   * Public interface for initiating a state machine change.
   * This routine single-threads the request and coordinates
   * the scheduling of multiple vaps for the purpose of selecting
   * an operating channel.  Specifically the following scenarios
   * are handled:
   * o only one vap can be selecting a channel so on transition to
   *   SCAN state if another vap is already scanning then
   *   mark the caller for later processing and return without
   *   doing anything (XXX? expectations by caller of synchronous operation)
   * o only one vap can be doing CAC of a channel so on transition to
   *   CAC state if another vap is already scanning for radar then
   *   mark the caller for later processing and return without
   *   doing anything (XXX? expectations by caller of synchronous operation)
   * o if another vap is already running when a request is made
   *   to SCAN then an operating channel has been chosen; bypass
   *   the scan and just join the channel
   *
   * Note that the state change call is done through the iv_newstate
   * method pointer so any driver routine gets invoked.  The driver
   * will normally call back into operating mode-specific
   * ieee80211_newstate routines (below) unless it needs to completely
   * bypass the state machine (e.g. because the firmware has it's
   * own idea how things should work).  Bypassing the net80211 layer
   * is usually a mistake and indicates lack of proper integration
   * with the net80211 layer.
   */
  int
  ieee80211_new_state_locked(struct ieee80211vap *vap,
          enum ieee80211_state nstate, int arg)
  {
          struct ieee80211com *ic = vap->iv_ic;
          struct ieee80211vap *vp;
          enum ieee80211_state ostate;
          int nrunning, nscanning;
  
          IEEE80211_LOCK_ASSERT(ic);
  
          if (vap->iv_flags_ext & IEEE80211_FEXT_STATEWAIT) {
                  if (vap->iv_nstate == IEEE80211_S_INIT ||
                      ((vap->iv_state == IEEE80211_S_INIT ||
                      (vap->iv_flags_ext & IEEE80211_FEXT_REINIT)) &&
                      vap->iv_nstate == IEEE80211_S_SCAN &&
                      nstate > IEEE80211_S_SCAN)) {
                          /*
                           * XXX The vap is being stopped/started,
                           * do not allow any other state changes
                           * until this is completed.
                           */
                          IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
                              "%s: %s -> %s (%s) transition discarded\n",
                              __func__,
                              ieee80211_state_name[vap->iv_state],
                              ieee80211_state_name[nstate],
                              ieee80211_state_name[vap->iv_nstate]);
                          return -1;
                  } else if (vap->iv_state != vap->iv_nstate) {
  #if 0
                          /* Warn if the previous state hasn't completed. */
                          IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
                              "%s: pending %s -> %s transition lost\n", __func__,
                              ieee80211_state_name[vap->iv_state],
                              ieee80211_state_name[vap->iv_nstate]);
  #else
                          /* XXX temporarily enable to identify issues */
                          if_printf(vap->iv_ifp,
                              "%s: pending %s -> %s transition lost\n",
                              __func__, ieee80211_state_name[vap->iv_state],
                              ieee80211_state_name[vap->iv_nstate]);
  #endif
                  }
          }
  
          nrunning = nscanning = 0;
          /* XXX can track this state instead of calculating */
          TAILQ_FOREACH(vp, &ic->ic_vaps, iv_next) {
                  if (vp != vap) {
                          if (vp->iv_state >= IEEE80211_S_RUN)
                                  nrunning++;
                          /* XXX doesn't handle bg scan */
                          /* NB: CAC+AUTH+ASSOC treated like SCAN */
                          else if (vp->iv_state > IEEE80211_S_INIT)
                                  nscanning++;
                  }
          }
          ostate = vap->iv_state;
          IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
              "%s: %s -> %s (nrunning %d nscanning %d)\n", __func__,
              ieee80211_state_name[ostate], ieee80211_state_name[nstate],
              nrunning, nscanning);
          switch (nstate) {
          case IEEE80211_S_SCAN:
                  if (ostate == IEEE80211_S_INIT) {
                          /*
                           * INIT -> SCAN happens on initial bringup.
                           */
                          KASSERT(!(nscanning && nrunning),
                              ("%d scanning and %d running", nscanning, nrunning));
                          if (nscanning) {
                                  /*
                                   * Someone is scanning, defer our state
                                   * change until the work has completed.
                                   */
                                  IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
                                      "%s: defer %s -> %s\n",
                                      __func__, ieee80211_state_name[ostate],
                                      ieee80211_state_name[nstate]);
                                  vap->iv_flags_ext |= IEEE80211_FEXT_SCANWAIT;
                                  return 0;
                          }
                          if (nrunning) {
                                  /*
                                   * Someone is operating; just join the channel
                                   * they have chosen.
                                   */
                                  /* XXX kill arg? */
                                  /* XXX check each opmode, adhoc? */
                                  if (vap->iv_opmode == IEEE80211_M_STA)
                                          nstate = IEEE80211_S_SCAN;
                                  else
                                          nstate = IEEE80211_S_RUN;
  #ifdef IEEE80211_DEBUG
                                  if (nstate != IEEE80211_S_SCAN) {
                                          IEEE80211_DPRINTF(vap,
                                              IEEE80211_MSG_STATE,
                                              "%s: override, now %s -> %s\n",
                                              __func__,
                                              ieee80211_state_name[ostate],
                                              ieee80211_state_name[nstate]);
                                  }
  #endif
                          }
                  }
                  break;
          case IEEE80211_S_RUN:
                  if (vap->iv_opmode == IEEE80211_M_WDS &&
                      (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) &&
                      nscanning) {
                          /*
                           * Legacy WDS with someone else scanning; don't
                           * go online until that completes as we should
                           * follow the other vap to the channel they choose.
                           */
                          IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
                               "%s: defer %s -> %s (legacy WDS)\n", __func__,
                               ieee80211_state_name[ostate],
                               ieee80211_state_name[nstate]);
                          vap->iv_flags_ext |= IEEE80211_FEXT_SCANWAIT;
                          return 0;
                  }
                  if (vap->iv_opmode == IEEE80211_M_HOSTAP &&
                      IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) &&
                      (vap->iv_flags_ext & IEEE80211_FEXT_DFS) &&
                      !IEEE80211_IS_CHAN_CACDONE(ic->ic_bsschan)) {
                          /*
                           * This is a DFS channel, transition to CAC state
                           * instead of RUN.  This allows us to initiate
                           * Channel Availability Check (CAC) as specified
                           * by 11h/DFS.
                           */
                          nstate = IEEE80211_S_CAC;
                          IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
                               "%s: override %s -> %s (DFS)\n", __func__,
                               ieee80211_state_name[ostate],
                               ieee80211_state_name[nstate]);
                  }
                  break;
          case IEEE80211_S_INIT:
                  /* cancel any scan in progress */
                  ieee80211_cancel_scan(vap);
                  if (ostate == IEEE80211_S_INIT ) {
                          /* XXX don't believe this */
                          /* INIT -> INIT. nothing to do */
                          vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANWAIT;
                  }
                  /* fall thru... */
          default:
                  break;
          }
          /* defer the state change to a thread */
          vap->iv_nstate = nstate;
          vap->iv_nstate_arg = arg;
          vap->iv_flags_ext |= IEEE80211_FEXT_STATEWAIT;
          ieee80211_runtask(ic, &vap->iv_nstate_task);
          return EINPROGRESS;
  }
  
  int
  ieee80211_new_state(struct ieee80211vap *vap,
          enum ieee80211_state nstate, int arg)
  {
          struct ieee80211com *ic = vap->iv_ic;
          int rc;
  
          IEEE80211_LOCK(ic);
          rc = ieee80211_new_state_locked(vap, nstate, arg);
          IEEE80211_UNLOCK(ic);
          return rc;
  }

Cache object: 4d4298b6e05d50e3d17a78f1ccbfffb2