mirror of
https://github.com/proski/madwifi
synced 2024-11-22 06:21:47 +03:00
8c73cc55b1
Linux 2.6.13 introduced Wireless Extension 18 with WPA support. It was released in August 2005. People making changes to MadWifi should not be required to be software archeologistists to test their changes.
1037 lines
30 KiB
C
1037 lines
30 KiB
C
/*-
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* Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
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* Copyright (c) 2005 Matt Mackall <mpm@selenic.com>
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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 ap 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 <linux/sort.h>
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#include "if_media.h"
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#include <net80211/ieee80211_var.h>
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#define AP_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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#define AP_HASHSIZE 32
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/* simple hash is enough for variation of macaddr */
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#define AP_HASH(addr) \
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(((const u_int8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % AP_HASHSIZE)
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#define SCAN_AP_LOCK_INIT(_st, _name) \
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spin_lock_init(&(_st)->as_lock)
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#define SCAN_AP_LOCK_DESTROY(_st)
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#define SCAN_AP_LOCK_IRQ(_st) do { \
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unsigned long __stlockflags; \
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spin_lock_irqsave(&(_st)->as_lock, __stlockflags);
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#define SCAN_AP_UNLOCK_IRQ(_st) \
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spin_unlock_irqrestore(&(_st)->as_lock, __stlockflags); \
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} while (0)
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#define SCAN_AP_UNLOCK_IRQ_EARLY(_st) \
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spin_unlock_irqrestore(&(_st)->as_lock, __stlockflags);
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#define SCAN_AP_GEN_LOCK_INIT(_st, _name) \
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spin_lock_init(&(_st)->as_scanlock)
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#define SCAN_AP_GEN_LOCK_DESTROY(_st)
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#define SCAN_AP_GEN_LOCK(_st) spin_lock(&(_st)->as_scanlock);
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#define SCAN_AP_GEN_UNLOCK(_st) spin_unlock(&(_st)->as_scanlock);
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struct scan_entry {
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struct ieee80211_scan_entry base;
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TAILQ_ENTRY(scan_entry) se_list;
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LIST_ENTRY(scan_entry) se_hash;
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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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struct ap_state {
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unsigned int as_vap_desired_mode; /* Used for channel selection,
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* vap->iv_des_mode */
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unsigned int as_required_mode; /* Used for channel selection,
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* filtered version of
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* as_vap_desired_mode */
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int as_maxrssi[IEEE80211_CHAN_MAX]; /* Used for channel selection */
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/* These fields are just for scan caching for returning responses to
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* wireless extensions. i.e. show peers, APs, etc. */
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spinlock_t as_lock; /* on scan table */
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int as_newscan; /* trigger for updating
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* seen/not-seen for aging */
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TAILQ_HEAD(, scan_entry) as_entry; /* all entries */
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ATH_LIST_HEAD(, scan_entry) as_hash[AP_HASHSIZE];
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spinlock_t as_scanlock; /* on as_scangen */
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u_int as_scangen; /* gen# for iterator */
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struct IEEE80211_TQ_STRUCT as_actiontq; /* tasklet for "action" */
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struct ieee80211_scan_entry as_selbss; /* selected bss for action tasklet */
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int (*as_action)(struct ieee80211vap *, const struct ieee80211_scan_entry *);
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};
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static int ap_flush(struct ieee80211_scan_state *);
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static void action_tasklet(IEEE80211_TQUEUE_ARG);
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static struct ieee80211_channel *find11gchannel(struct ieee80211com *ic,
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int i, int freq);
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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
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* look for AP in
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* normal channel
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*/
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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 const u_int16_t rcl1[] = /* 8 FCC channel: 52, 56, 60, 64,
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* 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,
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* 116, 120, 124, 128,
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* 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 = ARRAY_SIZE(a), .list = a
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static const struct scanlist staScanTable[] = {
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{ IEEE80211_MODE_11B, X(rcl3) },
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{ IEEE80211_MODE_11A, X(rcl1) },
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{ IEEE80211_MODE_11A, X(rcl2) },
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{ IEEE80211_MODE_11B, X(rcl8) },
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{ IEEE80211_MODE_11B, X(rcl9) },
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{ IEEE80211_MODE_11A, X(rcl4) },
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#ifdef ATH_TURBO_SCAN
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{ IEEE80211_MODE_TURBO_STATIC_A, X(rcl5) },
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{ IEEE80211_MODE_TURBO_STATIC_A, X(rcl6) },
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{ IEEE80211_MODE_TURBO_A, X(rcl6x) },
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{ IEEE80211_MODE_TURBO_A, X(rcl13) },
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#endif /* ATH_TURBO_SCAN */
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{ IEEE80211_MODE_11A, X(rcl7) },
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{ IEEE80211_MODE_11B, X(rcl10) },
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{ IEEE80211_MODE_11A, X(rcl11) },
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#ifdef ATH_TURBO_SCAN
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{ IEEE80211_MODE_TURBO_G, X(rcl12) },
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#endif /* ATH_TURBO_SCAN */
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{ .list = NULL }
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};
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#undef X
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/* This function must be invoked with locks acquired */
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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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/* XXX special-case 11b/g channels so we select
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* the g channel if both are present. */
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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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/* This function must be invoked with locks acquired */
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static int
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checktable(const struct scanlist *scan, const struct ieee80211_channel *c)
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{
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int i;
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for (; scan->list != NULL; scan++) {
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for (i = 0; i < scan->count; i++)
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if (scan->list[i] == c->ic_freq)
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return 1;
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}
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return 0;
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}
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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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ap_attach(struct ieee80211_scan_state *ss)
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{
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struct ap_state *as;
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_MOD_INC_USE(THIS_MODULE, return 0);
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MALLOC(as, struct ap_state *, sizeof(struct ap_state),
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M_80211_SCAN, M_NOWAIT | M_ZERO);
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if (as == NULL)
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return 0;
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SCAN_AP_LOCK_INIT(as, "scan_ap");
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SCAN_AP_GEN_LOCK_INIT(as, "scan_ap_gen");
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TAILQ_INIT(&as->as_entry);
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IEEE80211_INIT_TQUEUE(&as->as_actiontq, action_tasklet, ss);
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ss->ss_priv = as;
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ap_flush(ss);
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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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ap_detach(struct ieee80211_scan_state *ss)
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{
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struct ap_state *as = ss->ss_priv;
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if (as != NULL) {
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ap_flush(ss);
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IEEE80211_CANCEL_TQUEUE(&as->as_actiontq);
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FREE(as, 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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ap_flush(struct ieee80211_scan_state *ss)
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{
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struct ap_state *as = ss->ss_priv;
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struct scan_entry *se, *next;
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SCAN_AP_LOCK_IRQ(as);
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memset(as->as_maxrssi, 0, sizeof(as->as_maxrssi));
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TAILQ_FOREACH_SAFE(se, &as->as_entry, se_list, next) {
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TAILQ_REMOVE(&as->as_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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ss->ss_last = 0; /* ensure no channel will be picked */
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SCAN_AP_UNLOCK_IRQ(as);
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return 0;
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}
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/* This function must be invoked with locks acquired */
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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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/* This function must be invoked with locks acquired */
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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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/* 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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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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/*
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* Start an ap scan by populating the channel list.
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*/
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static int
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ap_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
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{
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struct ap_state *as = ss->ss_priv;
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struct ieee80211com *ic = NULL;
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const struct scanlist *sl = NULL;
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struct ieee80211_channel *c = NULL;
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int i;
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unsigned int mode = 0;
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SCAN_AP_LOCK_IRQ(as);
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ic = vap->iv_ic;
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/* Determine mode flags to match, or leave zero for auto mode */
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as->as_vap_desired_mode = vap->iv_des_mode;
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as->as_required_mode = 0;
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if (as->as_vap_desired_mode != IEEE80211_MODE_AUTO) {
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as->as_required_mode = chanflags[as->as_vap_desired_mode];
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if ((vap->iv_ath_cap & IEEE80211_ATHC_TURBOP) &&
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(as->as_required_mode != IEEE80211_CHAN_ST)) {
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/* Fixup for dynamic turbo flags */
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if (as->as_vap_desired_mode == IEEE80211_MODE_11G)
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as->as_required_mode = IEEE80211_CHAN_108G;
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else
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as->as_required_mode = IEEE80211_CHAN_108A;
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}
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}
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ss->ss_last = 0;
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/* Use the table of ordered channels to construct the list
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* of channels for scanning. Any channels in the ordered
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* list not in the master list will be discarded. */
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for (sl = staScanTable; sl->list != NULL; sl++) {
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mode = sl->mode;
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/* The scan table marks 2.4Ghz channels as b
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* so if the desired mode is 11g, then use
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* the 11b channel list but upgrade the mode. */
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if (as->as_vap_desired_mode &&
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(as->as_vap_desired_mode != mode) &&
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(as->as_vap_desired_mode == IEEE80211_MODE_11G) &&
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(mode == IEEE80211_MODE_11B))
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mode = IEEE80211_MODE_11G;
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/* If we are in "AUTO" mode, upgrade the mode to auto.
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* This lets add_channels upgrade an 11b channel to
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* 11g if available. */
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if (!as->as_vap_desired_mode && (mode == IEEE80211_MODE_11B))
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mode = IEEE80211_MODE_AUTO;
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/* Add the list of the channels; any that are not
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* in the master channel list will be discarded. */
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add_channels(ic, ss, mode, sl->list, sl->count);
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}
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/* Add the channels from the ic (from HAL) that are not present
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* in the staScanTable, assuming they pass the sanity checks... */
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for (i = 0; i < ic->ic_nchans; i++) {
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c = &ic->ic_channels[i];
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/* XR is not supported on turbo channels */
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if (IEEE80211_IS_CHAN_TURBO(c) && vap->iv_flags & IEEE80211_F_XR)
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continue;
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/* Dynamic channels are scanned in base mode */
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if (!as->as_required_mode && !IEEE80211_IS_CHAN_ST(c))
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continue;
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/* Use any 11g channel instead of 11b one. */
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if (vap->iv_des_mode == IEEE80211_MODE_AUTO &&
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IEEE80211_IS_CHAN_B(c) &&
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find11gchannel(ic, i, c->ic_freq))
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continue;
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/* Do not add channels already put into the scan list by the
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* scan table - these have already been filtered by mode
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* and for whether they are in the active channel list. */
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if (checktable(staScanTable, c))
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|
continue;
|
|
|
|
/* Make sure the channel is active */
|
|
if ((c == NULL) || isclr(ic->ic_chan_active, c->ic_ieee))
|
|
continue;
|
|
|
|
/* Don't overrun */
|
|
if (ss->ss_last >= IEEE80211_SCAN_MAX)
|
|
break;
|
|
|
|
ss->ss_chans[ss->ss_last++] = c;
|
|
}
|
|
ss->ss_next = 0;
|
|
/* XXX tunables */
|
|
ss->ss_mindwell = msecs_to_jiffies(200); /* 200ms */
|
|
ss->ss_maxdwell = msecs_to_jiffies(300); /* 300ms */
|
|
|
|
#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 */
|
|
|
|
as->as_newscan = 1;
|
|
SCAN_AP_UNLOCK_IRQ(as);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Restart a bg scan.
|
|
*/
|
|
static int
|
|
ap_restart(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
|
|
{
|
|
struct ap_state *as = ss->ss_priv;
|
|
as->as_newscan = 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Cancel an ongoing scan.
|
|
*/
|
|
static int
|
|
ap_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
|
|
{
|
|
struct ap_state *as = ss->ss_priv;
|
|
IEEE80211_CANCEL_TQUEUE(&as->as_actiontq);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Record max rssi on channel.
|
|
*/
|
|
static int
|
|
ap_add(struct ieee80211_scan_state *ss, const struct ieee80211_scanparams *sp,
|
|
const struct ieee80211_frame *wh, int subtype, int rssi, u_int64_t rtsf)
|
|
{
|
|
struct ap_state *as = ss->ss_priv;
|
|
const u_int8_t *macaddr = wh->i_addr2;
|
|
struct ieee80211vap *vap = ss->ss_vap;
|
|
struct ieee80211com *ic = vap->iv_ic;
|
|
struct scan_entry *se = NULL;
|
|
struct ieee80211_scan_entry *ise = NULL;
|
|
int hash = AP_HASH(macaddr);
|
|
int chan;
|
|
|
|
/* This section provides scan results to wireless extensions */
|
|
SCAN_AP_LOCK_IRQ(as);
|
|
|
|
chan = ieee80211_chan2ieee(ic, ic->ic_curchan);
|
|
/* This is the only information used for channel selection by AP */
|
|
if (rssi > as->as_maxrssi[chan])
|
|
as->as_maxrssi[chan] = rssi;
|
|
LIST_FOREACH(se, &as->as_hash[hash], se_hash)
|
|
if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr) &&
|
|
(sp->ssid[1] == se->base.se_ssid[1]) &&
|
|
!memcmp(se->base.se_ssid + 2, sp->ssid + 2,
|
|
se->base.se_ssid[1]))
|
|
goto found;
|
|
|
|
MALLOC(se, struct scan_entry *, sizeof(struct scan_entry),
|
|
M_80211_SCAN, M_NOWAIT | M_ZERO);
|
|
|
|
if (se == NULL) {
|
|
SCAN_AP_UNLOCK_IRQ_EARLY(as);
|
|
return 0;
|
|
}
|
|
|
|
se->se_scangen = as->as_scangen-1;
|
|
IEEE80211_ADDR_COPY(se->base.se_macaddr, macaddr);
|
|
TAILQ_INSERT_TAIL(&as->as_entry, se, se_list);
|
|
LIST_INSERT_HEAD(&as->as_hash[hash], se, se_hash);
|
|
|
|
found:
|
|
ise = &se->base;
|
|
|
|
/* XXX: AP beaconing multiple SSID w/ same BSSID */
|
|
if ((sp->ssid[1] != 0) &&
|
|
((subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) ||
|
|
(ise->se_ssid[1] == 0)))
|
|
memcpy(ise->se_ssid, sp->ssid, 2 + sp->ssid[1]);
|
|
|
|
memcpy(ise->se_rates, sp->rates,
|
|
IEEE80211_SANITISE_RATESIZE(2 + sp->rates[1]));
|
|
if (sp->xrates != NULL) {
|
|
memcpy(ise->se_xrates, sp->xrates,
|
|
IEEE80211_SANITISE_RATESIZE(2 + sp->xrates[1]));
|
|
} else
|
|
ise->se_xrates[1] = 0;
|
|
|
|
IEEE80211_ADDR_COPY(ise->se_bssid, wh->i_addr3);
|
|
|
|
/* Record RSSI data using extended precision LPF filter.*/
|
|
if (se->se_lastupdate == 0) /* First sample */
|
|
se->se_avgrssi = RSSI_IN(rssi);
|
|
else /* Avg. w/ previous samples */
|
|
RSSI_LPF(se->se_avgrssi, rssi);
|
|
se->base.se_rssi = RSSI_GET(se->se_avgrssi);
|
|
|
|
ise->se_rtsf = rtsf;
|
|
memcpy(ise->se_tstamp.data, sp->tstamp, sizeof(ise->se_tstamp));
|
|
ise->se_intval = sp->bintval;
|
|
ise->se_capinfo = sp->capinfo;
|
|
ise->se_chan = ic->ic_curchan;
|
|
ise->se_fhdwell = sp->fhdwell;
|
|
ise->se_fhindex = sp->fhindex;
|
|
ise->se_erp = sp->erp;
|
|
ise->se_timoff = sp->timoff;
|
|
|
|
if (sp->tim != NULL) {
|
|
const struct ieee80211_tim_ie *tim =
|
|
(const struct ieee80211_tim_ie *)sp->tim;
|
|
ise->se_dtimperiod = tim->tim_period;
|
|
}
|
|
|
|
saveie(&ise->se_wme_ie, sp->wme);
|
|
saveie(&ise->se_wpa_ie, sp->wpa);
|
|
saveie(&ise->se_rsn_ie, sp->rsn);
|
|
saveie(&ise->se_ath_ie, sp->ath);
|
|
|
|
se->se_lastupdate = jiffies; /* update time */
|
|
se->se_seen = 1;
|
|
se->se_notseen = 0;
|
|
|
|
SCAN_AP_UNLOCK_IRQ(as);
|
|
|
|
return 1;
|
|
}
|
|
|
|
struct pc_params {
|
|
struct ieee80211vap *vap;
|
|
struct ieee80211_scan_state *ss;
|
|
int flags;
|
|
};
|
|
|
|
struct channel {
|
|
struct ieee80211_channel *chan;
|
|
int orig;
|
|
struct pc_params *params;
|
|
};
|
|
|
|
/* This function must be invoked with locks acquired */
|
|
static int
|
|
pc_cmp_radar(struct ieee80211_channel *a, struct ieee80211_channel *b)
|
|
{
|
|
/* a is better than b (return < 0) when b is marked while a is not */
|
|
return !!IEEE80211_IS_CHAN_RADAR(a) - !!IEEE80211_IS_CHAN_RADAR(b);
|
|
}
|
|
|
|
/* This function must be invoked with locks acquired */
|
|
static int
|
|
pc_cmp_keepmode(struct pc_params *params, struct ieee80211_channel *a,
|
|
struct ieee80211_channel *b)
|
|
{
|
|
struct ieee80211com *ic = params->vap->iv_ic;
|
|
struct ieee80211_channel *cur = ic->ic_bsschan;
|
|
|
|
if (!(params->flags & IEEE80211_SCAN_KEEPMODE))
|
|
return 0;
|
|
|
|
/* a is better than b (return < 0) when (a, cur) have the same mode
|
|
* and (b, cur) do not. */
|
|
return
|
|
!!IEEE80211_ARE_CHANS_SAME_MODE(b, cur) -
|
|
!!IEEE80211_ARE_CHANS_SAME_MODE(a, cur);
|
|
}
|
|
|
|
/* This function must be invoked with locks acquired */
|
|
static int
|
|
pc_cmp_sc(struct ieee80211com *ic, struct ieee80211_channel *a,
|
|
struct ieee80211_channel *b)
|
|
{
|
|
/* a is better than b (return < 0) when a has more chan nodes than b */
|
|
return
|
|
ic->ic_chan_nodes[b->ic_ieee] -
|
|
ic->ic_chan_nodes[a->ic_ieee];
|
|
}
|
|
|
|
/* This function must be invoked with locks acquired */
|
|
static int
|
|
pc_cmp_rssi(struct ap_state *as, struct ieee80211_channel *a,
|
|
struct ieee80211_channel *b)
|
|
{
|
|
/* a is better than b (return < 0) when a has rssi less than b */
|
|
return
|
|
as->as_maxrssi[a->ic_ieee] -
|
|
as->as_maxrssi[b->ic_ieee];
|
|
}
|
|
|
|
/* This function must be invoked with locks acquired */
|
|
static int
|
|
pc_cmp_samechan(struct ieee80211com *ic, struct ieee80211_channel *a,
|
|
struct ieee80211_channel *b)
|
|
{
|
|
struct ieee80211_channel *ic_bsschan = ic->ic_bsschan;
|
|
if (ic_bsschan == IEEE80211_CHAN_ANYC)
|
|
return 0;
|
|
/* a is better than b (return < 0) when a is current (and b is not) */
|
|
return (b == ic_bsschan) - (a == ic_bsschan);
|
|
}
|
|
|
|
/* This function must be invoked with locks acquired */
|
|
static int
|
|
pc_cmp_orig(struct channel *a, struct channel *b)
|
|
{
|
|
return a->orig - b->orig;
|
|
}
|
|
|
|
/* This function must be invoked with locks acquired */
|
|
static int
|
|
pc_cmp(const void *_a, const void *_b)
|
|
{
|
|
struct ieee80211_channel *a = ((struct channel *)_a)->chan;
|
|
struct ieee80211_channel *b = ((struct channel *)_b)->chan;
|
|
struct pc_params *params = ((struct channel *)_a)->params;
|
|
struct ieee80211com *ic = params->vap->iv_ic;
|
|
int res;
|
|
|
|
#define EVALUATE_CRITERION(name, ...) do { \
|
|
if ((res = pc_cmp_##name(__VA_ARGS__)) != 0) \
|
|
return res; \
|
|
} while (0)
|
|
|
|
EVALUATE_CRITERION(radar, a, b);
|
|
EVALUATE_CRITERION(keepmode, params, a, b);
|
|
EVALUATE_CRITERION(sc, ic, a, b);
|
|
/* XXX: rssi useless? pick_channel evaluates it anyway */
|
|
EVALUATE_CRITERION(rssi, params->ss->ss_priv, a, b);
|
|
EVALUATE_CRITERION(samechan, ic, a, b);
|
|
EVALUATE_CRITERION(orig, (struct channel *)_a, (struct channel *)_b);
|
|
|
|
#undef EVALUATE_CRITERION
|
|
return res;
|
|
}
|
|
|
|
/* This function must be invoked with locks acquired */
|
|
static void
|
|
pc_swap(void *a, void *b, int n)
|
|
{
|
|
struct ieee80211_channel *t = ((struct channel *)a)->chan;
|
|
int i;
|
|
|
|
((struct channel *)a)->chan = ((struct channel *)b)->chan;
|
|
((struct channel *)b)->chan = t;
|
|
|
|
i = ((struct channel *)a)->orig;
|
|
((struct channel *)a)->orig = ((struct channel *)b)->orig;
|
|
((struct channel *)b)->orig = i;
|
|
|
|
/* (struct channel *)x->params doesn't have to be swapped, because it
|
|
* is the same across all channels */
|
|
}
|
|
|
|
/* Pick a quiet channel to use for ap operation.
|
|
* Must be invoked while we hold the locks. */
|
|
static struct ieee80211_channel *
|
|
pick_channel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap,
|
|
u_int32_t flags)
|
|
{
|
|
struct ieee80211com *ic = vap->iv_ic;
|
|
unsigned int i, best_rssi;
|
|
int ss_last = ss->ss_last;
|
|
struct ieee80211_channel *best;
|
|
struct ap_state *as = ss->ss_priv;
|
|
struct channel chans[ss_last]; /* actually ss_last-1 is required */
|
|
struct channel *c = NULL;
|
|
struct pc_params params = { vap, ss, flags };
|
|
int benefit = 0;
|
|
int sta_assoc = 0;
|
|
|
|
for (i = 0; i < ss_last; i++) {
|
|
chans[i].chan = ss->ss_chans[i];
|
|
chans[i].orig = i;
|
|
chans[i].params = ¶ms;
|
|
}
|
|
|
|
sort(chans, ss_last, sizeof(*chans), pc_cmp, pc_swap);
|
|
|
|
#ifdef IEEE80211_DEBUG
|
|
for (i = 0; i < ss_last; i++) {
|
|
int chan = ieee80211_chan2ieee(ic, chans[i].chan);
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s: channel %u, "
|
|
"rssi %d, radar %d, cn %d, km %d\n",
|
|
__func__, chan, as->as_maxrssi[chan],
|
|
IEEE80211_IS_CHAN_RADAR(chans[i].chan),
|
|
ic->ic_chan_nodes[chans[i].chan->ic_ieee],
|
|
!!IEEE80211_ARE_CHANS_SAME_MODE(chans[i].chan,
|
|
ic->ic_bsschan));
|
|
}
|
|
#endif /* IEEE80211_DEBUG */
|
|
|
|
best = NULL;
|
|
best_rssi = 0xff; /* If signal is bigger than 0xff, we'd be melting. */
|
|
|
|
for (i = 0; i < ss_last; i++) {
|
|
c = &chans[i];
|
|
benefit = best_rssi - as->as_maxrssi[c->chan->ic_ieee];
|
|
sta_assoc = ic->ic_sta_assoc;
|
|
|
|
/* Don't switch... */
|
|
if (benefit <= 0)
|
|
continue;
|
|
|
|
/* Verify channel is not marked for non-occupancy */
|
|
if (IEEE80211_IS_CHAN_RADAR(c->chan) &&
|
|
(ic->ic_flags & IEEE80211_F_DOTH))
|
|
continue;
|
|
|
|
/* Do not select 802.11a ST if mode is specified and is not
|
|
* 802.11a ST */
|
|
if (as->as_required_mode &&
|
|
IEEE80211_IS_CHAN_STURBO(c->chan) &&
|
|
(as->as_vap_desired_mode != IEEE80211_MODE_TURBO_STATIC_A))
|
|
continue;
|
|
|
|
/* Verify mode matches any fixed mode specified */
|
|
if ((c->chan->ic_flags & as->as_required_mode) !=
|
|
as->as_required_mode)
|
|
continue;
|
|
|
|
if ((ic->ic_bsschan != NULL) &&
|
|
(ic->ic_bsschan != IEEE80211_CHAN_ANYC)) {
|
|
|
|
/* Make sure the channels are the same mode */
|
|
if ((flags & IEEE80211_SCAN_KEEPMODE) &&
|
|
!IEEE80211_ARE_CHANS_SAME_MODE(c->chan,
|
|
ic->ic_bsschan))
|
|
/* break the loop as the subsequent chans won't be
|
|
* better */
|
|
break;
|
|
|
|
if (!IEEE80211_ARE_CHANS_SAME_MODE(c->chan,
|
|
ic->ic_bsschan))
|
|
/* break the loop as the subsequent chans won't be
|
|
* better */
|
|
break;
|
|
}
|
|
|
|
if (sta_assoc != 0) {
|
|
int sl = ic->ic_cn_total -
|
|
ic->ic_chan_nodes[c->chan->ic_ieee]; /* count */
|
|
if (ic->ic_sc_algorithm == IEEE80211_SC_LOOSE) {
|
|
int sl_max = ic->ic_sc_sldg * benefit;
|
|
sl = 1000 * sl / sta_assoc; /* permil */
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
|
|
"%s: chan %d, dB gained: %d, "
|
|
"STAs lost: %d permil (max %d)\n",
|
|
__func__, c->chan->ic_ieee,
|
|
benefit, sl, sl_max);
|
|
if (sl > sl_max)
|
|
continue;
|
|
} else if (((ic->ic_sc_algorithm ==
|
|
IEEE80211_SC_TIGHT) ||
|
|
(ic->ic_sc_algorithm ==
|
|
IEEE80211_SC_STRICT)) &&
|
|
(sl > 0)) {
|
|
/* Break the loop as the subsequent chans
|
|
* won't be better. */
|
|
break;
|
|
}
|
|
}
|
|
best = c->chan;
|
|
best_rssi = as->as_maxrssi[best->ic_ieee];
|
|
}
|
|
|
|
if (best != NULL) {
|
|
i = best->ic_ieee;
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
|
|
"%s: best: channel %u rssi %d\n",
|
|
__func__, i, as->as_maxrssi[i]);
|
|
}
|
|
return best;
|
|
}
|
|
|
|
static int
|
|
ap_end(struct ieee80211_scan_state *ss, struct ieee80211vap *vap,
|
|
int (*action)(struct ieee80211vap *,
|
|
const struct ieee80211_scan_entry *),
|
|
u_int32_t flags)
|
|
{
|
|
struct ap_state *as = ss->ss_priv;
|
|
struct ieee80211_channel *bestchan = NULL;
|
|
struct ieee80211com *ic = NULL;
|
|
int res = 1;
|
|
|
|
SCAN_AP_LOCK_IRQ(as);
|
|
|
|
KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP,
|
|
("wrong opmode %u", vap->iv_opmode));
|
|
|
|
ic = vap->iv_ic;
|
|
bestchan = pick_channel(ss, vap, flags);
|
|
if (bestchan == NULL) {
|
|
if (ss->ss_last > 0) {
|
|
/* no suitable channel, should not happen */
|
|
printk(KERN_ERR "%s: %s: no suitable channel! "
|
|
"(should not happen)\n",
|
|
DEV_NAME(vap->iv_dev), __func__);
|
|
}
|
|
res = 1; /* Do NOT restart scan */
|
|
} else {
|
|
struct ieee80211_scan_entry se;
|
|
/* XXX: notify all VAPs? */
|
|
/* if this is a dynamic turbo frequency , start with normal
|
|
* mode first */
|
|
if (IEEE80211_IS_CHAN_TURBO(bestchan) &&
|
|
!IEEE80211_IS_CHAN_STURBO(bestchan)) {
|
|
if ((bestchan = ieee80211_find_channel(ic,
|
|
bestchan->ic_freq, bestchan->ic_flags &
|
|
~IEEE80211_CHAN_TURBO)) == NULL) {
|
|
/* should never happen ?? */
|
|
SCAN_AP_UNLOCK_IRQ_EARLY(as);
|
|
return 0;
|
|
}
|
|
}
|
|
memset(&se, 0, sizeof(se));
|
|
se.se_chan = bestchan;
|
|
|
|
as->as_action = ss->ss_ops->scan_default;
|
|
if (action)
|
|
as->as_action = action;
|
|
as->as_selbss = se;
|
|
|
|
/* Must defer action to avoid possible recursive call through
|
|
* 80211 state machine, which would result in recursive
|
|
* locking. */
|
|
IEEE80211_SCHEDULE_TQUEUE(&as->as_actiontq);
|
|
res = 1;
|
|
}
|
|
SCAN_AP_UNLOCK_IRQ(as);
|
|
return res;
|
|
}
|
|
|
|
static void
|
|
ap_age(struct ieee80211_scan_state *ss)
|
|
{
|
|
struct ap_state *as = ss->ss_priv;
|
|
struct scan_entry *se, *next;
|
|
|
|
SCAN_AP_LOCK_IRQ(as);
|
|
TAILQ_FOREACH_SAFE(se, &as->as_entry, se_list, next) {
|
|
if (se->se_notseen > AP_PURGE_SCANS) {
|
|
TAILQ_REMOVE(&as->as_entry, se, se_list);
|
|
LIST_REMOVE(se, se_hash);
|
|
FREE(se, M_80211_SCAN);
|
|
}
|
|
}
|
|
SCAN_AP_UNLOCK_IRQ(as);
|
|
}
|
|
|
|
static int
|
|
ap_iterate(struct ieee80211_scan_state *ss,
|
|
ieee80211_scan_iter_func *f, void *arg)
|
|
{
|
|
struct ap_state *as = ss->ss_priv;
|
|
struct scan_entry *se;
|
|
u_int gen;
|
|
int res = 0;
|
|
|
|
SCAN_AP_GEN_LOCK(as);
|
|
gen = as->as_scangen++;
|
|
restart:
|
|
SCAN_AP_LOCK_IRQ(as);
|
|
TAILQ_FOREACH(se, &as->as_entry, se_list) {
|
|
if (se->se_scangen != gen) {
|
|
se->se_scangen = gen;
|
|
/* update public state */
|
|
se->base.se_age = jiffies - se->se_lastupdate;
|
|
SCAN_AP_UNLOCK_IRQ_EARLY(as);
|
|
|
|
res = (*f)(arg, &se->base);
|
|
|
|
/* We probably ran out of buffer space. */
|
|
if (res != 0)
|
|
goto done;
|
|
|
|
goto restart;
|
|
}
|
|
}
|
|
|
|
SCAN_AP_UNLOCK_IRQ(as);
|
|
|
|
done:
|
|
SCAN_AP_GEN_UNLOCK(as);
|
|
|
|
return res;
|
|
}
|
|
|
|
static void
|
|
ap_assoc_success(struct ieee80211_scan_state *ss,
|
|
const u_int8_t macaddr[IEEE80211_ADDR_LEN])
|
|
{
|
|
/* should not be called */
|
|
}
|
|
|
|
static void
|
|
ap_assoc_fail(struct ieee80211_scan_state *ss,
|
|
const u_int8_t macaddr[IEEE80211_ADDR_LEN], int reason)
|
|
{
|
|
/* should not be called */
|
|
}
|
|
|
|
/*
|
|
* Default action to execute when a scan entry is found for ap
|
|
* mode. Return 1 on success, 0 on failure
|
|
*/
|
|
static int
|
|
ap_default_action(struct ieee80211vap *vap,
|
|
const struct ieee80211_scan_entry *se)
|
|
{
|
|
ieee80211_create_ibss(vap, se->se_chan);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
action_tasklet(IEEE80211_TQUEUE_ARG data)
|
|
{
|
|
struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *)data;
|
|
struct ap_state *as = (struct ap_state *)ss->ss_priv;
|
|
struct ieee80211vap *vap = ss->ss_vap;
|
|
SCAN_AP_LOCK_IRQ(as);
|
|
if (as->as_newscan) {
|
|
struct scan_entry *se;
|
|
TAILQ_FOREACH(se, &as->as_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++;
|
|
}
|
|
as->as_newscan = 0;
|
|
}
|
|
SCAN_AP_UNLOCK_IRQ(as);
|
|
|
|
(*ss->ss_ops->scan_default)(vap, &as->as_selbss);
|
|
}
|
|
|
|
/*
|
|
* Module glue.
|
|
*/
|
|
MODULE_AUTHOR("Errno Consulting, Sam Leffler");
|
|
MODULE_DESCRIPTION("802.11 wireless support: default ap scanner");
|
|
#ifdef MODULE_LICENSE
|
|
MODULE_LICENSE("Dual BSD/GPL");
|
|
#endif
|
|
|
|
static const struct ieee80211_scanner ap_default = {
|
|
.scan_name = "default",
|
|
.scan_attach = ap_attach,
|
|
.scan_detach = ap_detach,
|
|
.scan_start = ap_start,
|
|
.scan_restart = ap_restart,
|
|
.scan_cancel = ap_cancel,
|
|
.scan_end = ap_end,
|
|
.scan_flush = ap_flush,
|
|
.scan_add = ap_add,
|
|
.scan_age = ap_age,
|
|
.scan_iterate = ap_iterate,
|
|
.scan_assoc_success = ap_assoc_success,
|
|
.scan_assoc_fail = ap_assoc_fail,
|
|
.scan_default = ap_default_action,
|
|
};
|
|
|
|
|
|
static int __init
|
|
init_scanner_ap(void)
|
|
{
|
|
ieee80211_scanner_register(IEEE80211_M_HOSTAP, &ap_default);
|
|
return 0;
|
|
}
|
|
module_init(init_scanner_ap);
|
|
|
|
static void __exit
|
|
exit_scanner_ap(void)
|
|
{
|
|
ieee80211_scanner_unregister_all(&ap_default);
|
|
}
|
|
module_exit(exit_scanner_ap);
|