mirror of
https://github.com/proski/madwifi
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e408c071a2
Use CONFIG_LOCALVERSION as an alternative to check that the configuration settings have been included. git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@4134 0192ed92-7a03-0410-a25b-9323aeb14dbd
1513 lines
42 KiB
C
1513 lines
42 KiB
C
/*-
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* Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id$
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*/
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#ifndef EXPORT_SYMTAB
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#define EXPORT_SYMTAB
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#endif
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/*
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* IEEE 802.11 station scanning support.
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*/
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#if !defined(AUTOCONF_INCLUDED) && !defined(CONFIG_LOCALVERSION)
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#include <linux/config.h>
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#endif
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#include <linux/version.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include "if_media.h"
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#include <net80211/ieee80211_var.h>
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/*
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* Parameters for managing cache entries:
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*
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* o a station with STA_FAILS_MAX failures is not considered
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* when picking a candidate
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* o a station that hasn't had an update in STA_PURGE_SCANS
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* (background) scans is discarded
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* o after STA_FAILS_AGE seconds we clear the failure count
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*/
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#define STA_FAILS_MAX 2 /* assoc failures before ignored */
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#define STA_FAILS_AGE (2 * 60) /* time before clearing fails (secs) */
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#define STA_PURGE_SCANS 2 /* age for purging entries (scans) */
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#define RSSI_LPF_LEN 10
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#define RSSI_EP_MULTIPLIER (1<<7) /* pow2 to optimize out * and / */
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#define RSSI_IN(x) ((x) * RSSI_EP_MULTIPLIER)
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#define LPF_RSSI(x, y, len) (((x) * ((len) - 1) + (y)) / (len))
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#define RSSI_LPF(x, y) do { \
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if ((y) >= -20) \
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x = LPF_RSSI((x), RSSI_IN((y)), RSSI_LPF_LEN); \
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} while (0)
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#define EP_RND(x, mul) \
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((((x)%(mul)) >= ((mul)/2)) ? howmany(x, mul) : (x)/(mul))
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#define RSSI_GET(x) EP_RND(x, RSSI_EP_MULTIPLIER)
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struct sta_entry {
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struct ieee80211_scan_entry base;
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TAILQ_ENTRY(sta_entry) se_list;
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LIST_ENTRY(sta_entry) se_hash;
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u_int8_t se_fails; /* failure to associate count */
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u_int8_t se_seen; /* seen during current scan */
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u_int8_t se_notseen; /* not seen in previous scans */
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u_int32_t se_avgrssi; /* LPF rssi state */
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unsigned long se_lastupdate; /* time of last update */
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unsigned long se_lastfail; /* time of last failure */
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unsigned long se_lastassoc; /* time of last association */
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u_int se_scangen; /* iterator scan gen# */
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};
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#define STA_HASHSIZE 32
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/* simple hash is enough for variation of macaddr */
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#define STA_HASH(addr) \
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(((const u_int8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % STA_HASHSIZE)
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struct sta_table {
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spinlock_t st_lock; /* on scan table */
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TAILQ_HEAD(, sta_entry) st_entry; /* all entries */
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ATH_LIST_HEAD(, sta_entry) st_hash[STA_HASHSIZE];
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spinlock_t st_scanlock; /* on st_scangen */
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u_int st_scangen; /* gen# for iterator */
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int st_newscan;
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struct IEEE80211_TQ_STRUCT st_actiontq; /* tasklet for "action" */
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struct ieee80211_scan_entry st_selbss; /* selected bss for action tasklet */
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int (*st_action)(struct ieee80211vap *, const struct ieee80211_scan_entry *);
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};
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#define SCAN_STA_LOCK_INIT(_st, _name) \
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spin_lock_init(&(_st)->st_lock)
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#define SCAN_STA_LOCK_DESTROY(_st)
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#define SCAN_STA_LOCK_IRQ(_st) do { \
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unsigned long __stlockflags; \
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spin_lock_irqsave(&(_st)->st_lock, __stlockflags);
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#define SCAN_STA_UNLOCK_IRQ(_st) \
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spin_unlock_irqrestore(&(_st)->st_lock, __stlockflags); \
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} while (0)
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#define SCAN_STA_UNLOCK_IRQ_EARLY(_st) \
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spin_unlock_irqrestore(&(_st)->st_lock, __stlockflags);
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#define SCAN_STA_GEN_LOCK_INIT(_st, _name) \
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spin_lock_init(&(_st)->st_scanlock)
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#define SCAN_STA_GEN_LOCK_DESTROY(_st)
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#define SCAN_STA_GEN_LOCK(_st) spin_lock(&(_st)->st_scanlock);
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#define SCAN_STA_GEN_UNLOCK(_st) spin_unlock(&(_st)->st_scanlock);
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static void sta_flush_table(struct sta_table *);
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static int match_bss(struct ieee80211vap *, const struct ieee80211_scan_state *,
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const struct sta_entry *);
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static void action_tasklet(IEEE80211_TQUEUE_ARG);
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/*
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* Attach prior to any scanning work.
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*/
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static int
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sta_attach(struct ieee80211_scan_state *ss)
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{
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struct sta_table *st;
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_MOD_INC_USE(THIS_MODULE, return 0);
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MALLOC(st, struct sta_table *, sizeof(struct sta_table),
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M_80211_SCAN, M_NOWAIT | M_ZERO);
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if (st == NULL)
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return 0;
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SCAN_STA_LOCK_INIT(st, "scan_sta");
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SCAN_STA_GEN_LOCK_INIT(st, "scan_sta_gen");
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TAILQ_INIT(&st->st_entry);
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IEEE80211_INIT_TQUEUE(&st->st_actiontq, action_tasklet, ss);
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ss->ss_priv = st;
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return 1;
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}
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/*
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* Cleanup any private state.
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*/
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static int
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sta_detach(struct ieee80211_scan_state *ss)
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{
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struct sta_table *st = ss->ss_priv;
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if (st != NULL) {
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IEEE80211_CANCEL_TQUEUE(&st->st_actiontq);
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sta_flush_table(st);
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FREE(st, M_80211_SCAN);
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}
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_MOD_DEC_USE(THIS_MODULE);
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return 1;
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}
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/*
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* Flush all per-scan state.
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*/
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static int
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sta_flush(struct ieee80211_scan_state *ss)
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{
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struct sta_table *st = ss->ss_priv;
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SCAN_STA_LOCK_IRQ(st);
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sta_flush_table(st);
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SCAN_STA_UNLOCK_IRQ(st);
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ss->ss_last = 0;
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return 0;
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}
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/*
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* Flush all entries in the scan cache.
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*/
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static void
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sta_flush_table(struct sta_table *st)
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{
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struct sta_entry *se, *next;
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TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) {
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TAILQ_REMOVE(&st->st_entry, se, se_list);
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LIST_REMOVE(se, se_hash);
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FREE(se, M_80211_SCAN);
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}
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}
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static void
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saveie(u_int8_t **iep, const u_int8_t *ie)
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{
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if (ie == NULL)
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*iep = NULL;
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else
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ieee80211_saveie(iep, ie);
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}
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/*
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* Process a beacon or probe response frame; create an
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* entry in the scan cache or update any previous entry.
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*/
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static int
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sta_add(struct ieee80211_scan_state *ss, const struct ieee80211_scanparams *sp,
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const struct ieee80211_frame *wh, int subtype, int rssi, u_int64_t rtsf)
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{
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#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
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#define PICK1ST(_ss) \
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((ss->ss_flags & (IEEE80211_SCAN_PICK1ST | IEEE80211_SCAN_GOTPICK)) == \
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IEEE80211_SCAN_PICK1ST)
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struct sta_table *st = ss->ss_priv;
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const u_int8_t *macaddr = wh->i_addr2;
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struct ieee80211vap *vap = ss->ss_vap;
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struct ieee80211com *ic = vap->iv_ic;
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struct sta_entry *se;
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struct ieee80211_scan_entry *ise;
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int hash;
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hash = STA_HASH(macaddr);
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SCAN_STA_LOCK_IRQ(st);
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LIST_FOREACH(se, &st->st_hash[hash], se_hash)
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if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr) &&
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sp->ssid[1] == se->base.se_ssid[1] &&
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!memcmp(se->base.se_ssid+2, sp->ssid+2, se->base.se_ssid[1]))
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goto found;
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MALLOC(se, struct sta_entry *, sizeof(struct sta_entry),
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M_80211_SCAN, M_NOWAIT | M_ZERO);
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if (se == NULL) {
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SCAN_STA_UNLOCK_IRQ_EARLY(st);
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return 0;
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}
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se->se_scangen = st->st_scangen-1;
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IEEE80211_ADDR_COPY(se->base.se_macaddr, macaddr);
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TAILQ_INSERT_TAIL(&st->st_entry, se, se_list);
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LIST_INSERT_HEAD(&st->st_hash[hash], se, se_hash);
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found:
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ise = &se->base;
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/* XXX ap beaconing multiple ssid w/ same bssid */
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if (sp->ssid[1] != 0 &&
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(ISPROBE(subtype) || ise->se_ssid[1] == 0))
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memcpy(ise->se_ssid, sp->ssid, 2 + sp->ssid[1]);
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memcpy(ise->se_rates, sp->rates,
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2 + IEEE80211_SANITISE_RATESIZE(sp->rates[1]));
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if (sp->xrates != NULL) {
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memcpy(ise->se_xrates, sp->xrates,
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2 + IEEE80211_SANITISE_RATESIZE(sp->xrates[1]));
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} else
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ise->se_xrates[1] = 0;
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IEEE80211_ADDR_COPY(ise->se_bssid, wh->i_addr3);
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/*
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* Record rssi data using extended precision LPF filter.
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*/
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if (se->se_lastupdate == 0) /* first sample */
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se->se_avgrssi = RSSI_IN(rssi);
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else /* avg w/ previous samples */
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RSSI_LPF(se->se_avgrssi, rssi);
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se->base.se_rssi = RSSI_GET(se->se_avgrssi);
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ise->se_rtsf = rtsf;
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memcpy(ise->se_tstamp.data, sp->tstamp, sizeof(ise->se_tstamp));
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ise->se_intval = sp->bintval;
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ise->se_capinfo = sp->capinfo;
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ise->se_chan = ic->ic_curchan;
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ise->se_fhdwell = sp->fhdwell;
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ise->se_fhindex = sp->fhindex;
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ise->se_erp = sp->erp;
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ise->se_timoff = sp->timoff;
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if (sp->tim != NULL) {
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const struct ieee80211_tim_ie *tim =
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(const struct ieee80211_tim_ie *)sp->tim;
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ise->se_dtimperiod = tim->tim_period;
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}
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saveie(&ise->se_wme_ie, sp->wme);
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saveie(&ise->se_wpa_ie, sp->wpa);
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saveie(&ise->se_rsn_ie, sp->rsn);
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saveie(&ise->se_ath_ie, sp->ath);
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/* clear failure count after STA_FAIL_AGE passes */
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if (se->se_fails &&
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time_after(jiffies, se->se_lastfail + (STA_FAILS_AGE * HZ))) {
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se->se_fails = 0;
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IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, macaddr,
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"%s: fails %u", __func__, se->se_fails);
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}
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se->se_lastupdate = jiffies; /* update time */
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se->se_seen = 1;
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se->se_notseen = 0;
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SCAN_STA_UNLOCK_IRQ(st);
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/*
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* If looking for a quick choice and nothing's
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* been found check here.
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*/
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if (PICK1ST(ss) && match_bss(vap, ss, se) == 0)
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ss->ss_flags |= IEEE80211_SCAN_GOTPICK;
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return 1;
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#undef PICK1ST
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#undef ISPROBE
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}
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static struct ieee80211_channel *
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find11gchannel(struct ieee80211com *ic, int i, int freq)
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{
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struct ieee80211_channel *c;
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int j;
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/*
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* The normal ordering in the channel list is b channel
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* immediately followed by g so optimize the search for
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* this. We'll still do a full search just in case.
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*/
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for (j = i+1; j < ic->ic_nchans; j++) {
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c = &ic->ic_channels[j];
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if (c->ic_freq == freq && IEEE80211_IS_CHAN_ANYG(c))
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return c;
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}
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for (j = 0; j < i; j++) {
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c = &ic->ic_channels[j];
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if (c->ic_freq == freq && IEEE80211_IS_CHAN_ANYG(c))
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return c;
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}
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return NULL;
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}
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static const u_int chanflags[] = {
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IEEE80211_CHAN_B, /* IEEE80211_MODE_AUTO */
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IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */
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IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */
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IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */
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IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */
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IEEE80211_CHAN_A, /* IEEE80211_MODE_TURBO_A */ /* for turbo mode look for AP in normal channel */
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IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_TURBO_G */
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IEEE80211_CHAN_ST, /* IEEE80211_MODE_TURBO_STATIC_A */
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};
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static void
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add_channels(struct ieee80211com *ic,
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struct ieee80211_scan_state *ss,
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enum ieee80211_phymode mode, const u_int16_t freq[], int nfreq)
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{
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struct ieee80211_channel *c, *cg;
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u_int modeflags;
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int i;
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KASSERT(mode < ARRAY_SIZE(chanflags), ("Unexpected mode %u", mode));
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modeflags = chanflags[mode];
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for (i = 0; i < nfreq; i++) {
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c = ieee80211_find_channel(ic, freq[i], modeflags);
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if (c == NULL || isclr(ic->ic_chan_active, c->ic_ieee))
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continue;
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if (mode == IEEE80211_MODE_AUTO) {
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/*
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* XXX special-case 11b/g channels so we select
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* the g channel if both are present.
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*/
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if (IEEE80211_IS_CHAN_B(c) &&
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(cg = find11gchannel(ic, i, c->ic_freq)) != NULL)
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c = cg;
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}
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if (ss->ss_last >= IEEE80211_SCAN_MAX)
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break;
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ss->ss_chans[ss->ss_last++] = c;
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}
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}
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static const u_int16_t rcl1[] = /* 8 FCC channel: 52, 56, 60, 64, 36, 40, 44, 48 */
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{ 5260, 5280, 5300, 5320, 5180, 5200, 5220, 5240 };
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static const u_int16_t rcl2[] = /* 4 MKK channels: 34, 38, 42, 46 */
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{ 5170, 5190, 5210, 5230 };
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static const u_int16_t rcl3[] = /* 2.4Ghz ch: 1,6,11,7,13 */
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{ 2412, 2437, 2462, 2442, 2472 };
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static const u_int16_t rcl4[] = /* 5 FCC channel: 149, 153, 161, 165 */
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{ 5745, 5765, 5785, 5805, 5825 };
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static const u_int16_t rcl7[] = /* 11 ETSI channel: 100,104,108,112,116,120,124,128,132,136,140 */
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{ 5500, 5520, 5540, 5560, 5580, 5600, 5620, 5640, 5660, 5680, 5700 };
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static const u_int16_t rcl8[] = /* 2.4Ghz ch: 2,3,4,5,8,9,10,12 */
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{ 2417, 2422, 2427, 2432, 2447, 2452, 2457, 2467 };
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static const u_int16_t rcl9[] = /* 2.4Ghz ch: 14 */
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{ 2484 };
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static const u_int16_t rcl10[] = /* Added Korean channels 2312-2372 */
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{ 2312, 2317, 2322, 2327, 2332, 2337, 2342, 2347, 2352, 2357, 2362, 2367, 2372 };
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static const u_int16_t rcl11[] = /* Added Japan channels in 4.9/5.0 spectrum */
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{ 5040, 5060, 5080, 4920, 4940, 4960, 4980 };
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#ifdef ATH_TURBO_SCAN
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static const u_int16_t rcl5[] = /* 3 static turbo channels */
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{ 5210, 5250, 5290 };
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static const u_int16_t rcl6[] = /* 2 static turbo channels */
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{ 5760, 5800 };
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static const u_int16_t rcl6x[] = /* 4 FCC3 turbo channels */
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{ 5540, 5580, 5620, 5660 };
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static const u_int16_t rcl12[] = /* 2.4Ghz Turbo channel 6 */
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{ 2437 };
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static const u_int16_t rcl13[] = /* dynamic Turbo channels */
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{ 5200, 5240, 5280, 5765, 5805 };
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#endif /* ATH_TURBO_SCAN */
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struct scanlist {
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u_int16_t mode;
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u_int16_t count;
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const u_int16_t *list;
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};
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#define IEEE80211_MODE_TURBO_STATIC_A IEEE80211_MODE_MAX
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#define X(a) .count = sizeof(a)/sizeof(a[0]), .list = a
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|
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static const struct scanlist staScanTable[] = {
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|
{ IEEE80211_MODE_11B, X(rcl3) },
|
|
{ IEEE80211_MODE_11A, X(rcl1) },
|
|
{ IEEE80211_MODE_11A, X(rcl2) },
|
|
{ IEEE80211_MODE_11B, X(rcl8) },
|
|
{ IEEE80211_MODE_11B, X(rcl9) },
|
|
{ IEEE80211_MODE_11A, X(rcl4) },
|
|
#ifdef ATH_TURBO_SCAN
|
|
{ IEEE80211_MODE_TURBO_STATIC_A, X(rcl5) },
|
|
{ IEEE80211_MODE_TURBO_STATIC_A, X(rcl6) },
|
|
{ IEEE80211_MODE_TURBO_A, X(rcl6x) },
|
|
{ IEEE80211_MODE_TURBO_A, X(rcl13) },
|
|
#endif /* ATH_TURBO_SCAN */
|
|
{ IEEE80211_MODE_11A, X(rcl7) },
|
|
{ IEEE80211_MODE_11B, X(rcl10) },
|
|
{ IEEE80211_MODE_11A, X(rcl11) },
|
|
#ifdef ATH_TURBO_SCAN
|
|
{ IEEE80211_MODE_TURBO_G, X(rcl12) },
|
|
#endif /* ATH_TURBO_SCAN */
|
|
{ .list = NULL }
|
|
};
|
|
|
|
#undef X
|
|
|
|
static int
|
|
checktable(const struct scanlist *scan, const struct ieee80211_channel *c)
|
|
{
|
|
int i;
|
|
|
|
for (; scan->list != NULL; scan++) {
|
|
for (i = 0; i < scan->count; i++)
|
|
if (scan->list[i] == c->ic_freq)
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Start a station-mode scan by populating the channel list.
|
|
*/
|
|
static int
|
|
sta_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
|
|
{
|
|
struct ieee80211com *ic = vap->iv_ic;
|
|
struct sta_table *st = ss->ss_priv;
|
|
const struct scanlist *scan;
|
|
enum ieee80211_phymode mode;
|
|
struct ieee80211_channel *c;
|
|
int i;
|
|
|
|
ss->ss_last = 0;
|
|
/*
|
|
* Use the table of ordered channels to construct the list
|
|
* of channels for scanning. Any channels in the ordered
|
|
* list not in the master list will be discarded.
|
|
*/
|
|
for (scan = staScanTable; scan->list != NULL; scan++) {
|
|
mode = scan->mode;
|
|
if (vap->iv_des_mode != IEEE80211_MODE_AUTO) {
|
|
/*
|
|
* If a desired mode was specified, scan only
|
|
* channels that satisfy that constraint.
|
|
*/
|
|
if (vap->iv_des_mode != mode) {
|
|
/*
|
|
* The scan table marks 2.4Ghz channels as b
|
|
* so if the desired mode is 11g, then use
|
|
* the 11b channel list but upgrade the mode.
|
|
*/
|
|
if (vap->iv_des_mode != IEEE80211_MODE_11G ||
|
|
mode != IEEE80211_MODE_11B)
|
|
continue;
|
|
mode = IEEE80211_MODE_11G; /* upgrade */
|
|
}
|
|
} else {
|
|
/*
|
|
* This lets ieee80211_scan_add_channels
|
|
* upgrade an 11b channel to 11g if available.
|
|
*/
|
|
if (mode == IEEE80211_MODE_11B)
|
|
mode = IEEE80211_MODE_AUTO;
|
|
}
|
|
/* XR does not operate on turbo channels */
|
|
if ((vap->iv_flags & IEEE80211_F_XR) &&
|
|
(mode == IEEE80211_MODE_TURBO_A ||
|
|
mode == IEEE80211_MODE_TURBO_G))
|
|
continue;
|
|
/*
|
|
* Add the list of the channels; any that are not
|
|
* in the master channel list will be discarded.
|
|
*/
|
|
add_channels(ic, ss, mode, scan->list, scan->count);
|
|
}
|
|
|
|
/*
|
|
* Add the channels from the ic (from HAL) that are not present
|
|
* in the staScanTable.
|
|
*/
|
|
for (i = 0; i < ic->ic_nchans; i++) {
|
|
c = &ic->ic_channels[i];
|
|
/*
|
|
* scan dynamic turbo channels in normal mode.
|
|
*/
|
|
if (IEEE80211_IS_CHAN_DTURBO(c))
|
|
continue;
|
|
mode = ieee80211_chan2mode(c);
|
|
if (vap->iv_des_mode != IEEE80211_MODE_AUTO) {
|
|
/*
|
|
* If a desired mode was specified, scan only
|
|
* channels that satisfy that constraint.
|
|
*/
|
|
if (vap->iv_des_mode != mode)
|
|
continue;
|
|
|
|
}
|
|
if (!checktable(staScanTable, c))
|
|
ss->ss_chans[ss->ss_last++] = c;
|
|
}
|
|
|
|
ss->ss_next = 0;
|
|
/* XXX tunables */
|
|
/*
|
|
* The scanner will stay on station for ss_maxdwell ms (using a
|
|
* timer), collecting responses. ss_maxdwell can adjusted downward
|
|
* so the station gets back on channel before DTIM occurs. If the
|
|
* station receives probe responses before ss_mindwell has elapsed, the
|
|
* timer continues. If it receives probe responses after ss_mindwell
|
|
* then the timer is cancelled and the next channel is chosen.
|
|
* Basically, you are going to get the mindwell if you are scanning an
|
|
* occupied channel in the real world and the maxdwell if it's empty.
|
|
*
|
|
* This seems somehow wrong to me, as you tend to want to fish where the
|
|
* fish is bitin'.
|
|
*
|
|
* I'm bumping mindwell up to 60ms (was 20ms). This gives us a reasonable
|
|
* chance to find all the APs with active scans, and should pick up
|
|
* everything within a few passes for passive.
|
|
*/
|
|
ss->ss_mindwell = msecs_to_jiffies(60); /* 60ms */
|
|
ss->ss_maxdwell = msecs_to_jiffies(200); /* 200ms */
|
|
|
|
#ifdef IEEE80211_DEBUG
|
|
if (ieee80211_msg_scan(vap)) {
|
|
printk("%s: scan set ", vap->iv_dev->name);
|
|
ieee80211_scan_dump_channels(ss);
|
|
printk(" dwell min %ld max %ld\n",
|
|
ss->ss_mindwell, ss->ss_maxdwell);
|
|
}
|
|
#endif /* IEEE80211_DEBUG */
|
|
|
|
st->st_newscan = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Restart a bg scan.
|
|
*/
|
|
static int
|
|
sta_restart(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
|
|
{
|
|
struct sta_table *st = ss->ss_priv;
|
|
|
|
st->st_newscan = 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Cancel an ongoing scan.
|
|
*/
|
|
static int
|
|
sta_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
|
|
{
|
|
struct sta_table *st = ss->ss_priv;
|
|
|
|
IEEE80211_CANCEL_TQUEUE(&st->st_actiontq);
|
|
return 0;
|
|
}
|
|
|
|
static u_int8_t
|
|
maxrate(const struct ieee80211_scan_entry *se)
|
|
{
|
|
u_int8_t max, r;
|
|
int i;
|
|
|
|
max = 0;
|
|
for (i = 0; i < se->se_rates[1]; i++) {
|
|
r = se->se_rates[2+i] & IEEE80211_RATE_VAL;
|
|
if (r > max)
|
|
max = r;
|
|
}
|
|
for (i = 0; i < se->se_xrates[1]; i++) {
|
|
r = se->se_xrates[2+i] & IEEE80211_RATE_VAL;
|
|
if (r > max)
|
|
max = r;
|
|
}
|
|
return max;
|
|
}
|
|
|
|
/*
|
|
* Compare the capabilities of two entries and decide which is
|
|
* more desirable (return >0 if a is considered better). Note
|
|
* that we assume compatibility/usability has already been checked
|
|
* so we don't need to (e.g. validate whether privacy is supported).
|
|
* Used to select the best scan candidate for association in a BSS.
|
|
*/
|
|
static int
|
|
sta_compare(const struct sta_entry *a, const struct sta_entry *b)
|
|
{
|
|
u_int8_t maxa, maxb;
|
|
int weight;
|
|
|
|
/* privacy support preferred */
|
|
if ((a->base.se_capinfo & IEEE80211_CAPINFO_PRIVACY) &&
|
|
(b->base.se_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
|
|
return 1;
|
|
if ((a->base.se_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0 &&
|
|
(b->base.se_capinfo & IEEE80211_CAPINFO_PRIVACY))
|
|
return -1;
|
|
|
|
/* compare count of previous failures */
|
|
weight = b->se_fails - a->se_fails;
|
|
if (abs(weight) > 1)
|
|
return weight;
|
|
|
|
if (abs(b->base.se_rssi - a->base.se_rssi) < 5) {
|
|
/* best/max rate preferred if signal level close enough XXX */
|
|
maxa = maxrate(&a->base);
|
|
maxb = maxrate(&b->base);
|
|
if (maxa != maxb)
|
|
return maxa - maxb;
|
|
/* XXX use freq for channel preference */
|
|
/* for now just prefer 5Ghz band to all other bands */
|
|
if (IEEE80211_IS_CHAN_5GHZ(a->base.se_chan) &&
|
|
!IEEE80211_IS_CHAN_5GHZ(b->base.se_chan))
|
|
return 1;
|
|
if (!IEEE80211_IS_CHAN_5GHZ(a->base.se_chan) &&
|
|
IEEE80211_IS_CHAN_5GHZ(b->base.se_chan))
|
|
return -1;
|
|
}
|
|
/* all things being equal, use signal level */
|
|
return a->base.se_rssi - b->base.se_rssi;
|
|
}
|
|
|
|
/*
|
|
* Check rate set suitability and return the best supported rate.
|
|
*/
|
|
static int
|
|
check_rate(struct ieee80211vap *vap, const struct ieee80211_scan_entry *se)
|
|
{
|
|
#define RV(v) ((v) & IEEE80211_RATE_VAL)
|
|
struct ieee80211com *ic = vap->iv_ic;
|
|
const struct ieee80211_rateset *srs;
|
|
int i, j, nrs, r, okrate, badrate, fixedrate;
|
|
const u_int8_t *rs;
|
|
|
|
okrate = badrate = fixedrate = 0;
|
|
|
|
if (IEEE80211_IS_CHAN_HALF(se->se_chan))
|
|
srs = &ic->ic_sup_half_rates;
|
|
else if (IEEE80211_IS_CHAN_QUARTER(se->se_chan))
|
|
srs = &ic->ic_sup_quarter_rates;
|
|
else
|
|
srs = &ic->ic_sup_rates[ieee80211_chan2mode(se->se_chan)];
|
|
nrs = se->se_rates[1];
|
|
rs = se->se_rates + 2;
|
|
fixedrate = IEEE80211_FIXED_RATE_NONE;
|
|
again:
|
|
for (i = 0; i < nrs; i++) {
|
|
r = RV(rs[i]);
|
|
badrate = r;
|
|
/*
|
|
* Check any fixed rate is included.
|
|
*/
|
|
if (r == vap->iv_fixed_rate)
|
|
fixedrate = r;
|
|
/*
|
|
* Check against our supported rates.
|
|
*/
|
|
for (j = 0; j < srs->rs_nrates; j++)
|
|
if (r == RV(srs->rs_rates[j])) {
|
|
if (r > okrate) /* NB: track max */
|
|
okrate = r;
|
|
break;
|
|
}
|
|
}
|
|
if (rs == se->se_rates+2) {
|
|
/* scan xrates too; sort of an algol68-style for loop */
|
|
nrs = se->se_xrates[1];
|
|
rs = se->se_xrates + 2;
|
|
goto again;
|
|
}
|
|
if (okrate == 0 || vap->iv_fixed_rate != fixedrate)
|
|
return badrate | IEEE80211_RATE_BASIC;
|
|
else
|
|
return RV(okrate);
|
|
#undef RV
|
|
}
|
|
|
|
static int
|
|
match_ssid(const u_int8_t *ie,
|
|
int nssid, const struct ieee80211_scan_ssid ssids[])
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < nssid; i++) {
|
|
if (ie[1] == ssids[i].len &&
|
|
memcmp(ie + 2, ssids[i].ssid, ie[1]) == 0)
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Test a scan candidate for suitability/compatibility.
|
|
*/
|
|
static int
|
|
match_bss(struct ieee80211vap *vap,
|
|
const struct ieee80211_scan_state *ss, const struct sta_entry *se0)
|
|
{
|
|
struct ieee80211com *ic = vap->iv_ic;
|
|
const struct ieee80211_scan_entry *se = &se0->base;
|
|
u_int8_t rate;
|
|
int fail;
|
|
|
|
fail = 0;
|
|
if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, se->se_chan)))
|
|
fail |= 0x01;
|
|
/*
|
|
* NB: normally the desired mode is used to construct
|
|
* the channel list, but it's possible for the scan
|
|
* cache to include entries for stations outside this
|
|
* list so we check the desired mode here to weed them
|
|
* out.
|
|
*/
|
|
if (vap->iv_des_mode != IEEE80211_MODE_AUTO &&
|
|
(se->se_chan->ic_flags & IEEE80211_CHAN_ALLTURBO) !=
|
|
chanflags[vap->iv_des_mode])
|
|
fail |= 0x01;
|
|
if (vap->iv_opmode == IEEE80211_M_IBSS) {
|
|
if ((se->se_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
|
|
fail |= 0x02;
|
|
} else {
|
|
if ((se->se_capinfo & IEEE80211_CAPINFO_ESS) == 0)
|
|
fail |= 0x02;
|
|
}
|
|
if (vap->iv_flags & IEEE80211_F_PRIVACY) {
|
|
if ((se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
|
|
fail |= 0x04;
|
|
} else {
|
|
/* XXX does this mean privacy is supported or required? */
|
|
if (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY)
|
|
fail |= 0x04;
|
|
}
|
|
rate = check_rate(vap, se);
|
|
if (rate & IEEE80211_RATE_BASIC)
|
|
fail |= 0x08;
|
|
if (ss->ss_nssid != 0 &&
|
|
!match_ssid(se->se_ssid, ss->ss_nssid, ss->ss_ssid))
|
|
fail |= 0x10;
|
|
if ((vap->iv_flags & IEEE80211_F_DESBSSID) &&
|
|
!IEEE80211_ADDR_EQ(vap->iv_des_bssid, se->se_bssid))
|
|
fail |= 0x20;
|
|
if (se0->se_fails >= STA_FAILS_MAX)
|
|
fail |= 0x40;
|
|
if (se0->se_notseen >= STA_PURGE_SCANS)
|
|
fail |= 0x80;
|
|
#ifdef IEEE80211_DEBUG
|
|
if (ieee80211_msg_is_reported(vap, IEEE80211_MSG_SCAN | IEEE80211_MSG_ROAM)) {
|
|
printk(" %03x", fail);
|
|
printk(" %c " MAC_FMT,
|
|
fail & 0x40 ? '=' : fail & 0x80 ? '^' : fail ? '-' : '+',
|
|
MAC_ADDR(se->se_macaddr));
|
|
printk(" " MAC_FMT "%c", MAC_ADDR(se->se_bssid),
|
|
fail & 0x20 ? '!' : ' ');
|
|
printk(" %3d%c", ieee80211_chan2ieee(ic, se->se_chan),
|
|
fail & 0x01 ? '!' : ' ');
|
|
printk(" %+4d", se->se_rssi);
|
|
printk(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2,
|
|
fail & 0x08 ? '!' : ' ');
|
|
printk(" %4s%c",
|
|
(se->se_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" :
|
|
(se->se_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : "????",
|
|
fail & 0x02 ? '!' : ' ');
|
|
printk(" %3s%c ",
|
|
(se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) ? "wep" : "no",
|
|
fail & 0x04 ? '!' : ' ');
|
|
ieee80211_print_essid(se->se_ssid + 2, se->se_ssid[1]);
|
|
printk("%s\n", fail & 0x10 ? "!" : "");
|
|
}
|
|
#endif
|
|
return fail;
|
|
}
|
|
|
|
static void
|
|
sta_update_notseen(struct sta_table *st)
|
|
{
|
|
struct sta_entry *se;
|
|
|
|
SCAN_STA_LOCK_IRQ(st);
|
|
TAILQ_FOREACH(se, &st->st_entry, se_list) {
|
|
/*
|
|
* If seen then reset and don't bump the count;
|
|
* otherwise bump the ``not seen'' count. Note
|
|
* that this ensures that stations for which we
|
|
* see frames while not scanning but not during
|
|
* this scan will not be penalized.
|
|
*/
|
|
if (se->se_seen)
|
|
se->se_seen = 0;
|
|
else
|
|
se->se_notseen++;
|
|
}
|
|
SCAN_STA_UNLOCK_IRQ(st);
|
|
}
|
|
|
|
static void
|
|
sta_dec_fails(struct sta_table *st)
|
|
{
|
|
struct sta_entry *se;
|
|
|
|
SCAN_STA_LOCK_IRQ(st);
|
|
TAILQ_FOREACH(se, &st->st_entry, se_list)
|
|
if (se->se_fails)
|
|
se->se_fails--;
|
|
SCAN_STA_UNLOCK_IRQ(st);
|
|
}
|
|
|
|
static struct sta_entry *
|
|
select_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
|
|
{
|
|
struct sta_table *st = ss->ss_priv;
|
|
struct sta_entry *se, *selbs = NULL;
|
|
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN | IEEE80211_MSG_ROAM, " %s\n",
|
|
"macaddr bssid chan rssi rate flag wep essid");
|
|
SCAN_STA_LOCK_IRQ(st);
|
|
TAILQ_FOREACH(se, &st->st_entry, se_list) {
|
|
if (match_bss(vap, ss, se) == 0) {
|
|
if (selbs == NULL)
|
|
selbs = se;
|
|
else if (sta_compare(se, selbs) > 0)
|
|
selbs = se;
|
|
}
|
|
}
|
|
SCAN_STA_UNLOCK_IRQ(st);
|
|
|
|
return selbs;
|
|
}
|
|
|
|
/*
|
|
* Pick an ap or ibss network to join or find a channel
|
|
* to use to start an ibss network.
|
|
*/
|
|
static int
|
|
sta_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap,
|
|
int (*action)(struct ieee80211vap *, const struct ieee80211_scan_entry *),
|
|
u_int32_t flags)
|
|
{
|
|
struct sta_table *st = ss->ss_priv;
|
|
struct sta_entry *selbss;
|
|
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s Checking scan results\n",
|
|
__func__);
|
|
|
|
KASSERT(vap->iv_opmode == IEEE80211_M_STA,
|
|
("wrong mode %u", vap->iv_opmode));
|
|
|
|
if (st->st_newscan) {
|
|
sta_update_notseen(st);
|
|
st->st_newscan = 0;
|
|
}
|
|
if (ss->ss_flags & IEEE80211_SCAN_NOPICK) {
|
|
/*
|
|
* Manual/background scan, don't select+join the
|
|
* bss, just return. The scanning framework will
|
|
* handle notification that this has completed.
|
|
*/
|
|
ss->ss_flags &= ~IEEE80211_SCAN_NOPICK;
|
|
return 1;
|
|
}
|
|
/*
|
|
* Automatic sequencing; look for a candidate and
|
|
* if found join the network.
|
|
*/
|
|
/* NB: unlocked read should be ok */
|
|
if (TAILQ_FIRST(&st->st_entry) == NULL) {
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
|
|
"%s: no scan candidate\n", __func__);
|
|
notfound:
|
|
/*
|
|
* If nothing suitable was found decrement
|
|
* the failure counts so entries will be
|
|
* reconsidered the next time around. We
|
|
* really want to do this only for STAs
|
|
* where we've previously had some success.
|
|
*/
|
|
sta_dec_fails(st);
|
|
st->st_newscan = 1;
|
|
return 0; /* restart scan */
|
|
}
|
|
st->st_action = ss->ss_ops->scan_default;
|
|
if (action)
|
|
st->st_action = action;
|
|
if ((selbss = select_bss(ss, vap)) == NULL) {
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
|
|
"%s: select_bss failed\n", __func__);
|
|
goto notfound;
|
|
}
|
|
st->st_selbss = selbss->base;
|
|
|
|
/*
|
|
* Must defer action to avoid possible recursive call through 80211
|
|
* state machine, which would result in recursive locking.
|
|
*/
|
|
IEEE80211_SCHEDULE_TQUEUE(&st->st_actiontq);
|
|
|
|
return 1; /* terminate scan */
|
|
}
|
|
|
|
|
|
/*
|
|
* Lookup an entry in the scan cache. We assume we're
|
|
* called from the bottom half or such that we don't need
|
|
* to block the bottom half so that it's safe to return
|
|
* a reference to an entry w/o holding the lock on the table.
|
|
*/
|
|
static struct sta_entry *
|
|
sta_lookup(struct sta_table *st, const u_int8_t macaddr[IEEE80211_ADDR_LEN],
|
|
struct ieee80211_scan_ssid *essid)
|
|
{
|
|
struct sta_entry *se;
|
|
int hash = STA_HASH(macaddr);
|
|
|
|
SCAN_STA_LOCK_IRQ(st);
|
|
LIST_FOREACH(se, &st->st_hash[hash], se_hash)
|
|
if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr) &&
|
|
(essid->len == se->base.se_ssid[1] &&
|
|
!memcmp(se->base.se_ssid+2, essid->ssid,
|
|
se->base.se_ssid[1])))
|
|
break;
|
|
SCAN_STA_UNLOCK_IRQ(st);
|
|
|
|
return se; /* NB: unlocked */
|
|
}
|
|
|
|
static void
|
|
sta_roam_check(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
|
|
{
|
|
struct ieee80211_node *ni = vap->iv_bss;
|
|
struct ieee80211com *ic = vap->iv_ic;
|
|
struct sta_table *st = ss->ss_priv;
|
|
struct sta_entry *se, *selbs;
|
|
u_int8_t roamRate, curRate;
|
|
int8_t roamRssi, curRssi;
|
|
|
|
se = sta_lookup(st, ni->ni_macaddr, ss->ss_ssid);
|
|
if (se == NULL) {
|
|
/* XXX something is wrong */
|
|
return;
|
|
}
|
|
|
|
if (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan)) {
|
|
roamRate = vap->iv_roam.rate11g;
|
|
roamRssi = vap->iv_roam.rssi11g;
|
|
} else if (IEEE80211_IS_CHAN_B(ic->ic_bsschan)) {
|
|
roamRate = vap->iv_roam.rate11bOnly;
|
|
roamRssi = vap->iv_roam.rssi11bOnly;
|
|
} else {
|
|
roamRate = vap->iv_roam.rate11a;
|
|
roamRssi = vap->iv_roam.rssi11a;
|
|
}
|
|
/* NB: the most up to date rssi is in the node, not the scan cache */
|
|
curRssi = ic->ic_node_getrssi(ni);
|
|
if (vap->iv_fixed_rate == IEEE80211_FIXED_RATE_NONE) {
|
|
curRate = ni->ni_rates.rs_rates[ni->ni_txrate] & IEEE80211_RATE_VAL;
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM,
|
|
"%s: currssi %d currate %u roamrssi %d roamrate %u\n",
|
|
__func__, curRssi, curRate, roamRssi, roamRate);
|
|
} else {
|
|
curRate = roamRate; /* NB: ensure compare below fails */
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM,
|
|
"%s: currssi %d roamrssi %d\n",
|
|
__func__, curRssi, roamRssi);
|
|
}
|
|
if ((vap->iv_flags & IEEE80211_F_BGSCAN) &&
|
|
time_after(jiffies, ic->ic_lastscan + vap->iv_scanvalid)) {
|
|
/*
|
|
* Scan cache contents is too old; check about updating it.
|
|
*/
|
|
if (curRate < roamRate || curRssi < roamRssi) {
|
|
/*
|
|
* Thresholds exceeded, force a scan now so we
|
|
* have current state to make a decision with.
|
|
*/
|
|
ieee80211_bg_scan(vap);
|
|
} else if (time_after(jiffies,
|
|
ic->ic_lastdata + vap->iv_bgscanidle)) {
|
|
/*
|
|
* We're not in need of a new ap, but idle;
|
|
* kick off a bg scan to replenish the cache.
|
|
*/
|
|
ieee80211_bg_scan(vap);
|
|
}
|
|
} else {
|
|
/*
|
|
* Scan cache contents are warm enough to use;
|
|
* check if a new ap should be used and switch.
|
|
* XXX deauth current ap
|
|
*/
|
|
if (curRate < roamRate || curRssi < roamRssi) {
|
|
se->base.se_rssi = curRssi;
|
|
selbs = select_bss(ss, vap);
|
|
if (selbs != NULL && selbs != se)
|
|
ieee80211_sta_join(vap, &selbs->base);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Age entries in the scan cache.
|
|
* XXX also do roaming since it's convenient
|
|
*/
|
|
static void
|
|
sta_age(struct ieee80211_scan_state *ss)
|
|
{
|
|
struct ieee80211vap *vap = ss->ss_vap;
|
|
struct sta_table *st = ss->ss_priv;
|
|
struct sta_entry *se, *next;
|
|
|
|
SCAN_STA_LOCK_IRQ(st);
|
|
TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) {
|
|
if (se->se_notseen > STA_PURGE_SCANS) {
|
|
TAILQ_REMOVE(&st->st_entry, se, se_list);
|
|
LIST_REMOVE(se, se_hash);
|
|
FREE(se, M_80211_SCAN);
|
|
}
|
|
}
|
|
SCAN_STA_UNLOCK_IRQ(st);
|
|
/*
|
|
* If rate control is enabled check periodically to see if
|
|
* we should roam from our current connection to one that
|
|
* might be better. This only applies when we're operating
|
|
* in sta mode and automatic roaming is set.
|
|
* XXX defer if busy
|
|
* XXX repeater station
|
|
*/
|
|
KASSERT(vap->iv_opmode == IEEE80211_M_STA,
|
|
("wrong mode %u", vap->iv_opmode));
|
|
if (vap->iv_opmode == IEEE80211_M_STA &&
|
|
vap->iv_ic->ic_roaming == IEEE80211_ROAMING_AUTO &&
|
|
vap->iv_state >= IEEE80211_S_RUN)
|
|
/* XXX vap is implicit */
|
|
sta_roam_check(ss, vap);
|
|
}
|
|
|
|
/*
|
|
* Iterate over the entries in the scan cache, invoking
|
|
* the callback function on each one.
|
|
*/
|
|
static int
|
|
sta_iterate(struct ieee80211_scan_state *ss,
|
|
ieee80211_scan_iter_func *f, void *arg)
|
|
{
|
|
struct sta_table *st = ss->ss_priv;
|
|
struct sta_entry *se;
|
|
u_int gen;
|
|
int res = 0;
|
|
|
|
SCAN_STA_GEN_LOCK(st);
|
|
gen = st->st_scangen++;
|
|
restart:
|
|
SCAN_STA_LOCK_IRQ(st);
|
|
TAILQ_FOREACH(se, &st->st_entry, se_list) {
|
|
if (se->se_scangen != gen) {
|
|
se->se_scangen = gen;
|
|
/* update public state */
|
|
se->base.se_age = jiffies - se->se_lastupdate;
|
|
SCAN_STA_UNLOCK_IRQ_EARLY(st);
|
|
|
|
res = (*f)(arg, &se->base);
|
|
|
|
if (res != 0)
|
|
/* We probably ran out of buffer space. */
|
|
goto done;
|
|
|
|
goto restart;
|
|
}
|
|
}
|
|
|
|
SCAN_STA_UNLOCK_IRQ(st);
|
|
|
|
done:
|
|
SCAN_STA_GEN_UNLOCK(st);
|
|
|
|
return res;
|
|
}
|
|
|
|
static void
|
|
sta_assoc_fail(struct ieee80211_scan_state *ss,
|
|
const u_int8_t macaddr[IEEE80211_ADDR_LEN], int reason)
|
|
{
|
|
struct sta_table *st = ss->ss_priv;
|
|
struct sta_entry *se;
|
|
|
|
if (ss->ss_vap->iv_ic->ic_roaming == IEEE80211_ROAMING_MANUAL)
|
|
return;
|
|
|
|
se = sta_lookup(st, macaddr, ss->ss_ssid);
|
|
if (se != NULL) {
|
|
se->se_fails++;
|
|
se->se_lastfail = jiffies;
|
|
IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN,
|
|
macaddr, "%s: reason %u fails %u",
|
|
__func__, reason, se->se_fails);
|
|
}
|
|
}
|
|
|
|
static void
|
|
sta_assoc_success(struct ieee80211_scan_state *ss,
|
|
const u_int8_t macaddr[IEEE80211_ADDR_LEN])
|
|
{
|
|
struct sta_table *st = ss->ss_priv;
|
|
struct sta_entry *se;
|
|
|
|
se = sta_lookup(st, macaddr, ss->ss_ssid);
|
|
if (se != NULL) {
|
|
#if 0
|
|
se->se_fails = 0;
|
|
IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN,
|
|
macaddr, "%s: fails %u", __func__, se->se_fails);
|
|
#endif
|
|
se->se_lastassoc = jiffies;
|
|
}
|
|
}
|
|
|
|
static const struct ieee80211_scanner sta_default = {
|
|
.scan_name = "default",
|
|
.scan_attach = sta_attach,
|
|
.scan_detach = sta_detach,
|
|
.scan_start = sta_start,
|
|
.scan_restart = sta_restart,
|
|
.scan_cancel = sta_cancel,
|
|
.scan_end = sta_pick_bss,
|
|
.scan_flush = sta_flush,
|
|
.scan_add = sta_add,
|
|
.scan_age = sta_age,
|
|
.scan_iterate = sta_iterate,
|
|
.scan_assoc_fail = sta_assoc_fail,
|
|
.scan_assoc_success = sta_assoc_success,
|
|
.scan_default = ieee80211_sta_join,
|
|
};
|
|
|
|
/*
|
|
* Start an adhoc-mode scan by populating the channel list.
|
|
*/
|
|
static int
|
|
adhoc_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
|
|
{
|
|
struct ieee80211com *ic = vap->iv_ic;
|
|
struct sta_table *st = ss->ss_priv;
|
|
const struct scanlist *scan;
|
|
enum ieee80211_phymode mode;
|
|
|
|
ss->ss_last = 0;
|
|
/*
|
|
* Use the table of ordered channels to construct the list
|
|
* of channels for scanning. Any channels in the ordered
|
|
* list not in the master list will be discarded.
|
|
*/
|
|
for (scan = staScanTable; scan->list != NULL; scan++) {
|
|
mode = scan->mode;
|
|
if (vap->iv_des_mode != IEEE80211_MODE_AUTO) {
|
|
/*
|
|
* If a desired mode was specified, scan only
|
|
* channels that satisfy that constraint.
|
|
*/
|
|
if (vap->iv_des_mode != mode) {
|
|
/*
|
|
* The scan table marks 2.4Ghz channels as b
|
|
* so if the desired mode is 11g, then use
|
|
* the 11b channel list but upgrade the mode.
|
|
*/
|
|
if (vap->iv_des_mode != IEEE80211_MODE_11G ||
|
|
mode != IEEE80211_MODE_11B)
|
|
continue;
|
|
mode = IEEE80211_MODE_11G; /* upgrade */
|
|
}
|
|
} else {
|
|
/*
|
|
* This lets ieee80211_scan_add_channels
|
|
* upgrade an 11b channel to 11g if available.
|
|
*/
|
|
if (mode == IEEE80211_MODE_11B)
|
|
mode = IEEE80211_MODE_AUTO;
|
|
}
|
|
/* XR does not operate on turbo channels */
|
|
if ((vap->iv_flags & IEEE80211_F_XR) &&
|
|
(mode == IEEE80211_MODE_TURBO_A ||
|
|
mode == IEEE80211_MODE_TURBO_G))
|
|
continue;
|
|
/*
|
|
* Add the list of the channels; any that are not
|
|
* in the master channel list will be discarded.
|
|
*/
|
|
add_channels(ic, ss, mode, scan->list, scan->count);
|
|
}
|
|
ss->ss_next = 0;
|
|
/* XXX tunables */
|
|
ss->ss_mindwell = msecs_to_jiffies(200); /* 200ms */
|
|
ss->ss_maxdwell = msecs_to_jiffies(200); /* 200ms */
|
|
|
|
#ifdef IEEE80211_DEBUG
|
|
if (ieee80211_msg_scan(vap)) {
|
|
printk("%s: scan set ", vap->iv_dev->name);
|
|
ieee80211_scan_dump_channels(ss);
|
|
printk(" dwell min %ld max %ld\n",
|
|
ss->ss_mindwell, ss->ss_maxdwell);
|
|
}
|
|
#endif /* IEEE80211_DEBUG */
|
|
|
|
st->st_newscan = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Select a channel to start an adhoc network on.
|
|
* The channel list was populated with appropriate
|
|
* channels so select one that looks least occupied.
|
|
* XXX need regulatory domain constraints
|
|
*/
|
|
static struct ieee80211_channel *
|
|
adhoc_pick_channel(struct ieee80211_scan_state *ss)
|
|
{
|
|
struct sta_table *st = ss->ss_priv;
|
|
struct sta_entry *se;
|
|
struct ieee80211_channel *c, *bestchan;
|
|
int i, bestrssi, maxrssi;
|
|
|
|
bestchan = NULL;
|
|
bestrssi = -1;
|
|
|
|
SCAN_STA_LOCK_IRQ(st);
|
|
for (i = 0; i < ss->ss_last; i++) {
|
|
c = ss->ss_chans[i];
|
|
maxrssi = 0;
|
|
TAILQ_FOREACH(se, &st->st_entry, se_list) {
|
|
if (se->base.se_chan != c)
|
|
continue;
|
|
if (se->base.se_rssi > maxrssi)
|
|
maxrssi = se->base.se_rssi;
|
|
}
|
|
if (bestchan == NULL || maxrssi < bestrssi)
|
|
bestchan = c;
|
|
}
|
|
SCAN_STA_UNLOCK_IRQ(st);
|
|
|
|
return bestchan;
|
|
}
|
|
|
|
/*
|
|
* Pick an ibss network to join or find a channel
|
|
* to use to start an ibss network.
|
|
*/
|
|
static int
|
|
adhoc_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap,
|
|
int (*action)(struct ieee80211vap *, const struct ieee80211_scan_entry *),
|
|
u_int32_t flags)
|
|
{
|
|
struct sta_table *st = ss->ss_priv;
|
|
struct sta_entry *selbs;
|
|
struct ieee80211_channel *chan;
|
|
|
|
KASSERT(vap->iv_opmode == IEEE80211_M_IBSS ||
|
|
vap->iv_opmode == IEEE80211_M_AHDEMO,
|
|
("wrong opmode %u", vap->iv_opmode));
|
|
|
|
if (st->st_newscan) {
|
|
sta_update_notseen(st);
|
|
st->st_newscan = 0;
|
|
}
|
|
if (ss->ss_flags & IEEE80211_SCAN_NOPICK) {
|
|
/*
|
|
* Manual/background scan, don't select+join the
|
|
* bss, just return. The scanning framework will
|
|
* handle notification that this has completed.
|
|
*/
|
|
ss->ss_flags &= ~IEEE80211_SCAN_NOPICK;
|
|
return 1;
|
|
}
|
|
|
|
st->st_action = ss->ss_ops->scan_default;
|
|
if (action)
|
|
st->st_action = action;
|
|
|
|
/*
|
|
* Automatic sequencing; look for a candidate and
|
|
* if found join the network.
|
|
*/
|
|
/* NB: unlocked read should be ok */
|
|
if (TAILQ_FIRST(&st->st_entry) == NULL ||
|
|
(selbs = select_bss(ss, vap)) == NULL) {
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
|
|
"%s: no scan candidate\n", __func__);
|
|
if (vap->iv_des_nssid) {
|
|
/*
|
|
* No existing adhoc network to join and we have
|
|
* an ssid; start one up. If no channel was
|
|
* specified, try to select a channel.
|
|
*/
|
|
if (vap->iv_des_chan == IEEE80211_CHAN_ANYC)
|
|
chan = adhoc_pick_channel(ss);
|
|
else
|
|
chan = vap->iv_des_chan;
|
|
if (chan != NULL) {
|
|
struct ieee80211_scan_entry se;
|
|
|
|
memset(&se, 0, sizeof(se));
|
|
se.se_chan = chan;
|
|
st->st_selbss = se;
|
|
/* defer action */
|
|
IEEE80211_SCHEDULE_TQUEUE(&st->st_actiontq);
|
|
return 1;
|
|
}
|
|
}
|
|
/*
|
|
* If nothing suitable was found decrement
|
|
* the failure counts so entries will be
|
|
* reconsidered the next time around. We
|
|
* really want to do this only for STAs
|
|
* where we've previously had some success.
|
|
*/
|
|
sta_dec_fails(st);
|
|
st->st_newscan = 1;
|
|
return 0; /* restart scan */
|
|
}
|
|
|
|
/*
|
|
* Must defer action to avoid possible recursive call through 80211
|
|
* state machine, which would result in recursive locking.
|
|
*/
|
|
st->st_selbss = selbs->base;
|
|
IEEE80211_SCHEDULE_TQUEUE(&st->st_actiontq);
|
|
|
|
return 1; /* terminate scan */
|
|
}
|
|
|
|
/*
|
|
* Age entries in the scan cache.
|
|
*/
|
|
static void
|
|
adhoc_age(struct ieee80211_scan_state *ss)
|
|
{
|
|
struct sta_table *st = ss->ss_priv;
|
|
struct sta_entry *se, *next;
|
|
|
|
SCAN_STA_LOCK_IRQ(st);
|
|
TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) {
|
|
if (se->se_notseen > STA_PURGE_SCANS) {
|
|
TAILQ_REMOVE(&st->st_entry, se, se_list);
|
|
LIST_REMOVE(se, se_hash);
|
|
FREE(se, M_80211_SCAN);
|
|
}
|
|
}
|
|
SCAN_STA_UNLOCK_IRQ(st);
|
|
}
|
|
|
|
/*
|
|
* Default action to execute when a scan entry is found for adhoc
|
|
* mode. Return 1 on success, 0 on failure
|
|
*/
|
|
static int
|
|
adhoc_default_action(struct ieee80211vap *vap,
|
|
const struct ieee80211_scan_entry *se)
|
|
{
|
|
u_int8_t zeroMacAddr[IEEE80211_ADDR_LEN];
|
|
|
|
memset(&zeroMacAddr, 0, IEEE80211_ADDR_LEN);
|
|
if (IEEE80211_ADDR_EQ(se->se_bssid, &zeroMacAddr[0])) {
|
|
ieee80211_create_ibss(vap, se->se_chan);
|
|
return 1;
|
|
} else
|
|
return ieee80211_sta_join(vap, se);
|
|
}
|
|
|
|
static const struct ieee80211_scanner adhoc_default = {
|
|
.scan_name = "default",
|
|
.scan_attach = sta_attach,
|
|
.scan_detach = sta_detach,
|
|
.scan_start = adhoc_start,
|
|
.scan_restart = sta_restart,
|
|
.scan_cancel = sta_cancel,
|
|
.scan_end = adhoc_pick_bss,
|
|
.scan_flush = sta_flush,
|
|
.scan_add = sta_add,
|
|
.scan_age = adhoc_age,
|
|
.scan_iterate = sta_iterate,
|
|
.scan_assoc_fail = sta_assoc_fail,
|
|
.scan_assoc_success = sta_assoc_success,
|
|
.scan_default = adhoc_default_action,
|
|
};
|
|
|
|
static void
|
|
action_tasklet(IEEE80211_TQUEUE_ARG data)
|
|
{
|
|
struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *)data;
|
|
struct sta_table *st = (struct sta_table *)ss->ss_priv;
|
|
struct ieee80211vap *vap = ss->ss_vap;
|
|
struct ieee80211_channel *chan;
|
|
|
|
if ((*ss->ss_ops->scan_default)(vap, &st->st_selbss))
|
|
return;
|
|
|
|
switch (vap->iv_opmode) {
|
|
case IEEE80211_M_STA:
|
|
sta_dec_fails(st);
|
|
st->st_newscan = 1;
|
|
break;
|
|
default:
|
|
/* ADHOC */
|
|
if (vap->iv_des_nssid) {
|
|
/*
|
|
* No existing adhoc network to join and we have
|
|
* an ssid; start one up. If no channel was
|
|
* specified, try to select a channel.
|
|
*/
|
|
if (vap->iv_des_chan == IEEE80211_CHAN_ANYC)
|
|
chan = adhoc_pick_channel(ss);
|
|
else
|
|
chan = vap->iv_des_chan;
|
|
if (chan != NULL) {
|
|
struct ieee80211_scan_entry se;
|
|
|
|
memset(&se, 0, sizeof(se));
|
|
se.se_chan = chan;
|
|
if ((*ss->ss_ops->scan_default)(vap, &se))
|
|
return;
|
|
}
|
|
}
|
|
/*
|
|
* If nothing suitable was found decrement
|
|
* the failure counts so entries will be
|
|
* reconsidered the next time around. We
|
|
* really want to do this only for STAs
|
|
* where we've previously had some success.
|
|
*/
|
|
sta_dec_fails(st);
|
|
st->st_newscan = 1;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* restart scan
|
|
*/
|
|
|
|
/* no ap, clear the flag for a new scan */
|
|
vap->iv_ic->ic_flags &= ~IEEE80211_F_SCAN;
|
|
if ((ss->ss_flags & IEEE80211_SCAN_USECACHE) == 0)
|
|
ieee80211_start_scan(vap, ss->ss_flags, ss->ss_duration, ss->ss_nssid, ss->ss_ssid);
|
|
}
|
|
|
|
/*
|
|
* Module glue.
|
|
*/
|
|
MODULE_AUTHOR("Errno Consulting, Sam Leffler");
|
|
MODULE_DESCRIPTION("802.11 wireless support: default station scanner");
|
|
#ifdef MODULE_LICENSE
|
|
MODULE_LICENSE("Dual BSD/GPL");
|
|
#endif
|
|
|
|
static int __init
|
|
init_scanner_sta(void)
|
|
{
|
|
ieee80211_scanner_register(IEEE80211_M_STA, &sta_default);
|
|
ieee80211_scanner_register(IEEE80211_M_IBSS, &adhoc_default);
|
|
ieee80211_scanner_register(IEEE80211_M_AHDEMO, &adhoc_default);
|
|
return 0;
|
|
}
|
|
module_init(init_scanner_sta);
|
|
|
|
static void __exit
|
|
exit_scanner_sta(void)
|
|
{
|
|
ieee80211_scanner_unregister_all(&sta_default);
|
|
ieee80211_scanner_unregister_all(&adhoc_default);
|
|
}
|
|
module_exit(exit_scanner_sta);
|