FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_node.h

     /*-
      * Copyright (c) 2001 Atsushi Onoe
      * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission.
     *
     * Alternatively, this software may be distributed under the terms of the
     * GNU General Public License ("GPL") version 2 as published by the Free
     * Software Foundation.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    #ifndef _NET80211_IEEE80211_NODE_H_
    #define _NET80211_IEEE80211_NODE_H_
    
    #define IEEE80211_PSCAN_WAIT    5               /* passive scan wait */
    #define IEEE80211_TRANS_WAIT    5               /* transition wait */
    #define IEEE80211_INACT_WAIT    5               /* inactivity timer interval */
    #define IEEE80211_INACT_MAX     (300/IEEE80211_INACT_WAIT)
    
    #define IEEE80211_NODE_HASHSIZE 32
    /* simple hash is enough for variation of macaddr */
    #define IEEE80211_NODE_HASH(addr)       \
            (((u_int8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % IEEE80211_NODE_HASHSIZE)
    
    #define IEEE80211_RATE_SIZE     8               /* 802.11 standard */
    #define IEEE80211_RATE_MAXSIZE  15              /* max rates we'll handle */
    
    struct ieee80211_rateset {
            u_int8_t                rs_nrates;
            u_int8_t                rs_rates[IEEE80211_RATE_MAXSIZE];
    };
    
    /*
     * Node specific information.  Note that drivers are expected
     * to derive from this structure to add device-specific per-node
     * state.  This is done by overriding the ic_node_* methods in
     * the ieee80211com structure.
     */
    struct ieee80211_node {
            TAILQ_ENTRY(ieee80211_node)     ni_list;
            LIST_ENTRY(ieee80211_node)      ni_hash;
            u_int                   ni_refcnt;
            u_int                   ni_scangen;     /* gen# for timeout scan */
    
            /* hardware */
            u_int32_t               ni_rstamp;      /* recv timestamp */
            u_int8_t                ni_rssi;        /* recv ssi */
    
            /* header */
            u_int8_t                ni_macaddr[IEEE80211_ADDR_LEN];
            u_int8_t                ni_bssid[IEEE80211_ADDR_LEN];
    
            /* beacon, probe response */
            u_int8_t                ni_tstamp[8];   /* from last rcv'd beacon */
            u_int16_t               ni_intval;      /* beacon interval */
            u_int16_t               ni_capinfo;     /* capabilities */
            u_int8_t                ni_esslen;
            u_int8_t                ni_essid[IEEE80211_NWID_LEN];
            struct ieee80211_rateset ni_rates;      /* negotiated rate set */
            u_int8_t                *ni_country;    /* country information XXX */
            struct ieee80211_channel *ni_chan;
            u_int16_t               ni_fhdwell;     /* FH only */
            u_int8_t                ni_fhindex;     /* FH only */
            u_int8_t                ni_erp;         /* 11g only */
    
    #ifdef notyet
            /* DTIM and contention free period (CFP) */
            u_int8_t                ni_dtimperiod;
            u_int8_t                ni_cfpperiod;   /* # of DTIMs between CFPs */
            u_int16_t               ni_cfpduremain; /* remaining cfp duration */
            u_int16_t               ni_cfpmaxduration;/* max CFP duration in TU */
            u_int16_t               ni_nextdtim;    /* time to next DTIM */
            u_int16_t               ni_timoffset;
    #endif
    
            /* others */
            u_int16_t               ni_associd;     /* assoc response */
           u_int16_t               ni_txseq;       /* seq to be transmitted */
           u_int16_t               ni_rxseq;       /* seq previous received */
           int                     ni_fails;       /* failure count to associate */
           int                     ni_inact;       /* inactivity mark count */
           int                     ni_txrate;      /* index to ni_rates[] */
   };
   
   static __inline struct ieee80211_node *
   ieee80211_ref_node(struct ieee80211_node *ni)
   {
           atomic_add_int(&ni->ni_refcnt, 1);
           return ni;
   }
   
   static __inline void
   ieee80211_unref_node(struct ieee80211_node **ni)
   {
           atomic_subtract_int(&(*ni)->ni_refcnt, 1);
           *ni = NULL;                     /* guard against use */
   }
   
   #define IEEE80211_NODE_LOCK_INIT(_ic, _name) \
           mtx_init(&(_ic)->ic_nodelock, _name, "802.11 node table", MTX_DEF)
   #define IEEE80211_NODE_LOCK_DESTROY(_ic)        mtx_destroy(&(_ic)->ic_nodelock)
   #define IEEE80211_NODE_LOCK(_ic)                mtx_lock(&(_ic)->ic_nodelock)
   #define IEEE80211_NODE_UNLOCK(_ic)              mtx_unlock(&(_ic)->ic_nodelock)
   #define IEEE80211_NODE_LOCK_ASSERT(_ic) \
           mtx_assert(&(_ic)->ic_nodelock, MA_OWNED)
   
   struct ieee80211com;
   
   #ifdef MALLOC_DECLARE
   MALLOC_DECLARE(M_80211_NODE);
   #endif
   
   extern  void ieee80211_node_attach(struct ifnet *);
   extern  void ieee80211_node_lateattach(struct ifnet *);
   extern  void ieee80211_node_detach(struct ifnet *);
   
   extern  void ieee80211_begin_scan(struct ifnet *);
   extern  void ieee80211_next_scan(struct ifnet *);
   extern  void ieee80211_end_scan(struct ifnet *);
   extern  struct ieee80211_node *ieee80211_alloc_node(struct ieee80211com *,
                   u_int8_t *);
   extern  struct ieee80211_node *ieee80211_dup_bss(struct ieee80211com *,
                   u_int8_t *);
   extern  struct ieee80211_node *ieee80211_find_node(struct ieee80211com *,
                   u_int8_t *);
   extern  struct ieee80211_node *ieee80211_find_txnode(struct ieee80211com *,
                   u_int8_t *);
   extern  struct ieee80211_node * ieee80211_lookup_node(struct ieee80211com *,
                   u_int8_t *macaddr, struct ieee80211_channel *);
   extern  void ieee80211_free_node(struct ieee80211com *,
                   struct ieee80211_node *);
   extern  void ieee80211_free_allnodes(struct ieee80211com *);
   typedef void ieee80211_iter_func(void *, struct ieee80211_node *);
   extern  void ieee80211_iterate_nodes(struct ieee80211com *ic,
                   ieee80211_iter_func *, void *);
   extern  void ieee80211_timeout_nodes(struct ieee80211com *);
   
   extern  void ieee80211_create_ibss(struct ieee80211com* ,
                   struct ieee80211_channel *);
   #endif /* _NET80211_IEEE80211_NODE_H_ */

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