text: /*	$NetBSD: ieee80211_node.h,v 1.23 2007/12/22 00:51:07 dyoung Exp $	*/
  /*-
   * Copyright (c) 2001 Atsushi Onoe
   * Copyright (c) 2002-2005 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: src/sys/net80211/ieee80211_node.h,v 1.22 2005/08/10 16:22:29 sam Exp $
   */
  #ifndef NETBSD_NET80211_IEEE80211_NODE_H
  #define NETBSD_NET80211_IEEE80211_NODE_H
  
  #include <net80211/netbsd_ieee80211_netbsd.h>
  #include <net80211/netbsd_ieee80211_ioctl.h>		/* for ieee80211_nodestats */
  
  /*
   * Each ieee80211com instance has a single timer that fires once a
   * second.  This is used to initiate various work depending on the
   * state of the instance: scanning (passive or active), ``transition''
   * (waiting for a response to a management frame when operating
   * as a station), and node inactivity processing (when operating
   * as an AP).  For inactivity processing each node has a timeout
   * set in it's ni_inact field that is decremented on each timeout
   * and the node is reclaimed when the counter goes to zero.  We
   * use different inactivity timeout values depending on whether
   * the node is associated and authorized (either by 802.1x or
   * open/shared key authentication) or associated but yet to be
   * authorized.  The latter timeout is shorter to more aggressively
   * reclaim nodes that leave part way through the 802.1x exchange.
   */
  #define	IEEE80211_INACT_WAIT	15		/* inactivity interval (secs) */
  #define	IEEE80211_INACT_INIT	(30/IEEE80211_INACT_WAIT)	/* initial */
  #define	IEEE80211_INACT_AUTH	(180/IEEE80211_INACT_WAIT)	/* associated but not authorized */
  #define	IEEE80211_INACT_RUN	(300/IEEE80211_INACT_WAIT)	/* authorized */
  #define	IEEE80211_INACT_PROBE	(30/IEEE80211_INACT_WAIT)	/* probe */
  #define	IEEE80211_INACT_SCAN	(300/IEEE80211_INACT_WAIT)	/* scanned */
  
  #define	IEEE80211_TRANS_WAIT 	5		/* mgt frame tx timer (secs) */
  
  #define	IEEE80211_NODE_HASHSIZE	32
  /* simple hash is enough for variation of macaddr */
  #define	IEEE80211_NODE_HASH(addr)	\
  	(((const u_int8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % \
  		IEEE80211_NODE_HASHSIZE)
  
  struct ieee80211_rsnparms {
  	u_int8_t	rsn_mcastcipher;	/* mcast/group cipher */
  	u_int8_t	rsn_mcastkeylen;	/* mcast key length */
  	u_int8_t	rsn_ucastcipherset;	/* unicast cipher set */
  	u_int8_t	rsn_ucastcipher;	/* selected unicast cipher */
  	u_int8_t	rsn_ucastkeylen;	/* unicast key length */
  	u_int8_t	rsn_keymgmtset;		/* key mangement algorithms */
  	u_int8_t	rsn_keymgmt;		/* selected key mgmt algo */
  	u_int16_t	rsn_caps;		/* capabilities */
  };
  
  struct ieee80211_node_table;
  struct ieee80211com;
  
  /*
   * 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 {
  	struct ieee80211com	*ni_ic;
  	struct ieee80211_node_table *ni_table;
  	TAILQ_ENTRY(ieee80211_node)	ni_list;
  	LIST_ENTRY(ieee80211_node)	ni_hash;
  	u_int			ni_refcnt;
  	u_int			ni_scangen;	/* gen# for timeout scan */
  	u_int8_t		ni_authmode;	/* authentication algorithm */
  	u_int16_t		ni_flags;	/* special-purpose state */
  #define	IEEE80211_NODE_AUTH	0x0001		/* authorized for data */
  #define	IEEE80211_NODE_QOS	0x0002		/* QoS enabled */
  #define	IEEE80211_NODE_ERP	0x0004		/* ERP enabled */
  /* NB: this must have the same value as IEEE80211_FC1_PWR_MGT */
  #define	IEEE80211_NODE_PWR_MGT	0x0010		/* power save mode enabled */
  #define	IEEE80211_NODE_AREF	0x0020		/* authentication ref held */
  	u_int16_t		ni_associd;	/* assoc response */
  	u_int16_t		ni_txpower;	/* current transmit power */
  	u_int16_t		ni_vlan;	/* vlan tag */
  	u_int32_t		*ni_challenge;	/* shared-key challenge */
  	u_int8_t		*ni_wpa_ie;	/* captured WPA/RSN ie */
  	u_int8_t		*ni_wme_ie;	/* captured WME ie */
  	u_int16_t		ni_txseqs[17];	/* tx seq per-tid */
  	u_int16_t		ni_rxseqs[17];	/* rx seq previous per-tid*/
  	u_int32_t		ni_rxfragstamp;	/* time stamp of last rx frag */
  	struct mbuf		*ni_rxfrag[3];	/* rx frag reassembly */
  	struct ieee80211_rsnparms ni_rsn;	/* RSN/WPA parameters */
  	struct ieee80211_key	ni_ucastkey;	/* unicast key */
  
  	/* 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 */
  	union {
  		u_int8_t	data[8];
  		u_int64_t	tsf;
  	} ni_tstamp;				/* 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 */
  	struct ieee80211_channel *ni_chan;	/* XXX multiple uses */
  	u_int16_t		ni_fhdwell;	/* FH only */
  	u_int8_t		ni_fhindex;	/* FH only */
  	u_int8_t		ni_erp;		/* ERP from beacon/probe resp */
  	u_int16_t		ni_timoff;	/* byte offset to TIM ie */
  	u_int8_t		ni_dtim_period;	/* DTIM period */
  	u_int8_t		ni_dtim_count;	/* DTIM count for last bcn */
  
  	/* others */
  	int			ni_fails;	/* failure count to associate */
  	short			ni_inact;	/* inactivity mark count */
  	short			ni_inact_reload;/* inactivity reload value */
  	int			ni_txrate;	/* index to ni_rates[] */
  	struct	ifqueue		ni_savedq;	/* ps-poll queue */
  	struct ieee80211_nodestats ni_stats;	/* per-node statistics */
  };
  //MALLOC_DECLARE(M_80211_NODE);
  
  #define	IEEE80211_NODE_AID(ni)	IEEE80211_AID(ni->ni_associd)
  
  #define	IEEE80211_NODE_STAT(ni,stat)	(ni->ni_stats.ns_##stat++)
  #define	IEEE80211_NODE_STAT_ADD(ni,stat,v)	(ni->ni_stats.ns_##stat += v)
  #define	IEEE80211_NODE_STAT_SET(ni,stat,v)	(ni->ni_stats.ns_##stat = v)
  
  static __inline struct ieee80211_node *
  ieee80211_ref_node(struct ieee80211_node *ni)
  {
  	ieee80211_node_incref(ni);
  	return ni;
  }
  
  static __inline void
  ieee80211_unref_node(struct ieee80211_node **ni)
  {
  	ieee80211_node_decref(*ni);
  	*ni = NULL;			/* guard against use */
  }
  
  struct ieee80211com;
  
  void	ieee80211_node_attach(struct ieee80211com *);
  void	ieee80211_node_lateattach(struct ieee80211com *);
  void	ieee80211_node_detach(struct ieee80211com *);
  
  static __inline int
  ieee80211_node_is_authorized(const struct ieee80211_node *ni)
  {
  	return (ni->ni_flags & IEEE80211_NODE_AUTH);
  }
  
  void	ieee80211_node_authorize(struct ieee80211_node *);
  void	ieee80211_node_unauthorize(struct ieee80211_node *);
  
  void	ieee80211_begin_scan(struct ieee80211com *, int);
  int	ieee80211_next_scan(struct ieee80211com *);
  void	ieee80211_probe_curchan(struct ieee80211com *, int);
  void	ieee80211_create_ibss(struct ieee80211com*, struct ieee80211_channel *);
  void	ieee80211_reset_bss(struct ieee80211com *);
  void	ieee80211_cancel_scan(struct ieee80211com *);
  void	ieee80211_end_scan(struct ieee80211com *);
  int	ieee80211_ibss_merge(struct ieee80211_node *);
  int	ieee80211_sta_join(struct ieee80211com *, struct ieee80211_node *);
  void	ieee80211_sta_leave(struct ieee80211com *, struct ieee80211_node *);
  
  /*
   * Table of ieee80211_node instances.  Each ieee80211com
   * has at least one for holding the scan candidates.
   * When operating as an access point or in ibss mode there
   * is a second table for associated stations or neighbors.
   */
  struct ieee80211_node_table {
  	struct ieee80211com	*nt_ic;		/* back reference */
  	ieee80211_node_lock_t	nt_nodelock;	/* on node table */
  	TAILQ_HEAD(, ieee80211_node) nt_node;	/* information of all nodes */
  	LIST_HEAD(, ieee80211_node) nt_hash[IEEE80211_NODE_HASHSIZE];
  	const char		*nt_name;	/* for debugging */
  	ieee80211_scan_lock_t	nt_scanlock;	/* on nt_scangen */
  	u_int			nt_scangen;	/* gen# for timeout scan */
  	int			nt_inact_timer;	/* inactivity timer */
  	int			nt_inact_init;	/* initial node inact setting */
  	struct ieee80211_node	**nt_keyixmap;	/* key ix -> node map */
  	int			nt_keyixmax;	/* keyixmap size */
  
  	void			(*nt_timeout)(struct ieee80211_node_table *);
  };
  void	ieee80211_node_table_reset(struct ieee80211_node_table *);
  
  struct ieee80211_node *ieee80211_alloc_node(
  		struct ieee80211_node_table *, const u_int8_t *);
  struct ieee80211_node *ieee80211_tmp_node(struct ieee80211com *,
  		const u_int8_t *macaddr);
  struct ieee80211_node *ieee80211_dup_bss(struct ieee80211_node_table *,
  		const u_int8_t *);
  #ifdef IEEE80211_DEBUG_REFCNT
  void	ieee80211_free_node_debug(struct ieee80211_node *,
  		const char *func, int line);
  struct ieee80211_node *ieee80211_find_node_debug(
  		struct ieee80211_node_table *, const u_int8_t *,
  		const char *func, int line);
  struct ieee80211_node * ieee80211_find_rxnode_debug(
  		struct ieee80211com *, const struct ieee80211_frame_min *,
  		const char *func, int line);
  struct ieee80211_node * ieee80211_find_rxnode_withkey_debug(
  		struct ieee80211com *,
  		const struct ieee80211_frame_min *, u_int16_t keyix,
  		const char *func, int line);
  struct ieee80211_node *ieee80211_find_txnode_debug(
  		struct ieee80211com *, const u_int8_t *,
  		const char *func, int line);
  struct ieee80211_node *ieee80211_find_node_with_channel_debug(
  		struct ieee80211_node_table *, const u_int8_t *macaddr,
  		struct ieee80211_channel *, const char *func, int line);
  struct ieee80211_node *ieee80211_find_node_with_ssid_debug(
  		struct ieee80211_node_table *, const u_int8_t *macaddr,
  		u_int ssidlen, const u_int8_t *ssid,
  		const char *func, int line);
  #define	ieee80211_free_node(ni) \
  	ieee80211_free_node_debug(ni, __func__, __LINE__)
  #define	ieee80211_find_node(nt, mac) \
  	ieee80211_find_node_debug(nt, mac, __func__, __LINE__)
  #define	ieee80211_find_rxnode(nt, wh) \
  	ieee80211_find_rxnode_debug(nt, wh, __func__, __LINE__)
  #define	ieee80211_find_rxnode_withkey(nt, wh, keyix) \
  	ieee80211_find_rxnode_withkey_debug(nt, wh, keyix, __func__, __LINE__)
  #define	ieee80211_find_txnode(nt, mac) \
  	ieee80211_find_txnode_debug(nt, mac, __func__, __LINE__)
  #define	ieee80211_find_node_with_channel(nt, mac, c) \
  	ieee80211_find_node_with_channel_debug(nt, mac, c, __func__, __LINE__)
  #define	ieee80211_find_node_with_ssid(nt, mac, sl, ss) \
  	ieee80211_find_node_with_ssid_debug(nt, mac, sl, ss, __func__, __LINE__)
  #else
  void	ieee80211_free_node(struct ieee80211_node *);
  struct ieee80211_node *ieee80211_find_node(
  		struct ieee80211_node_table *, const u_int8_t *);
  struct ieee80211_node * ieee80211_find_rxnode(
  		struct ieee80211com *, const struct ieee80211_frame_min *);
  struct ieee80211_node * ieee80211_find_rxnode_withkey(struct ieee80211com *,
  		const struct ieee80211_frame_min *, u_int16_t keyix);
  struct ieee80211_node *ieee80211_find_txnode(
  		struct ieee80211com *, const u_int8_t *);
  struct ieee80211_node *ieee80211_find_node_with_channel(
  		struct ieee80211_node_table *, const u_int8_t *macaddr,
  		struct ieee80211_channel *);
  struct ieee80211_node *ieee80211_find_node_with_ssid(
  		struct ieee80211_node_table *, const u_int8_t *macaddr,
  		u_int ssidlen, const u_int8_t *ssid);
  #endif
  int	ieee80211_node_delucastkey(struct ieee80211_node *);
  
  struct ieee80211_node *ieee80211_refine_node_for_beacon(
  		struct ieee80211com *, struct ieee80211_node *,
  		struct ieee80211_channel *, const u_int8_t *ssid);
  typedef void ieee80211_iter_func(void *, struct ieee80211_node *);
  void	ieee80211_iterate_nodes(struct ieee80211_node_table *,
  		ieee80211_iter_func *, void *);
  
  void	ieee80211_dump_node(struct ieee80211_node_table *,
  		struct ieee80211_node *);
  void	ieee80211_dump_nodes(struct ieee80211_node_table *);
  
  struct ieee80211_node *ieee80211_fakeup_adhoc_node(
  		struct ieee80211_node_table *, const u_int8_t macaddr[]);
  void	ieee80211_node_join(struct ieee80211com *, struct ieee80211_node *,int);
  void	ieee80211_node_leave(struct ieee80211com *, struct ieee80211_node *);
  u_int8_t ieee80211_getrssi(struct ieee80211com *ic);
  
  /*
   * Parameters supplied when adding/updating an entry in a
   * scan cache.  Pointer variables should be set to NULL
   * if no data is available.  Pointer references can be to
   * local data; any information that is saved will be copied.
   * All multi-byte values must be in host byte order.
   */
  struct ieee80211_scanparams {
  	u_int16_t	capinfo;	/* 802.11 capabilities */
  	u_int16_t	fhdwell;	/* FHSS dwell interval */
  	u_int8_t	chan;		/* */
  	u_int8_t	bchan;
  	u_int8_t	fhindex;
  	u_int8_t	erp;
  	u_int16_t	bintval;
  	u_int8_t	timoff;
  	u_int8_t	*tim;
  	u_int8_t	*tstamp;
  	u_int8_t	*country;
  	u_int8_t	*ssid;
  	u_int8_t	*rates;
  	u_int8_t	*xrates;
  	u_int8_t	*wpa;
  	u_int8_t	*wme;
  };
  
  void	ieee80211_add_scan(struct ieee80211com *,
  		const struct ieee80211_scanparams *,
  		const struct ieee80211_frame *,
  		int subtype, int rssi, int rstamp);
  void ieee80211_init_neighbor(struct ieee80211com *, struct ieee80211_node *,
  		const struct ieee80211_frame *,
  		const struct ieee80211_scanparams *, int);
  struct ieee80211_node *ieee80211_add_neighbor(struct ieee80211com *,
  		const struct ieee80211_frame *,
  		const struct ieee80211_scanparams *);
  #endif /* !_NET80211_IEEE80211_NODE_H_ */
  