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freebsd-dev/sys/net80211/ieee80211_node.h
Sam Leffler b5c9941514 Clarify/fix handling of the current channel: 
o add ic_curchan and use it uniformly for specifying the current
  channel instead of overloading ic->ic_bss->ni_chan (or in some
  drivers ic_ibss_chan)
o add ieee80211_scanparams structure to encapsulate scanning-related
  state captured for rx frames
o move rx beacon+probe response frame handling into separate routines
o change beacon+probe response handling to treat the scan table
  more like a scan cache--look for an existing entry before adding
  a new one; this combined with ic_curchan use corrects handling of
  stations that were previously found at a different channel
o move adhoc neighbor discovery by beacon+probe response frames to
  a new ieee80211_add_neighbor routine

Reviewed by:	avatar
Tested by:	avatar, Michal Mertl
MFC after:	2 weeks
2005-08-10 16:22:30 +00:00

331 lines
14 KiB
C
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/*-
* 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.
*
* $FreeBSD$
*/
#ifndef _NET80211_IEEE80211_NODE_H_
#define _NET80211_IEEE80211_NODE_H_
#include <net80211/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_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 *);
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);
struct ieee80211_node *ieee80211_add_neighbor(struct ieee80211com *,
const struct ieee80211_frame *,
const struct ieee80211_scanparams *);
#endif /* _NET80211_IEEE80211_NODE_H_ */
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