diff options
Diffstat (limited to 'package/d80211/src/ieee80211_scan.c')
| -rw-r--r-- | package/d80211/src/ieee80211_scan.c | 342 |
1 files changed, 0 insertions, 342 deletions
diff --git a/package/d80211/src/ieee80211_scan.c b/package/d80211/src/ieee80211_scan.c deleted file mode 100644 index fe28f578b2..0000000000 --- a/package/d80211/src/ieee80211_scan.c +++ /dev/null @@ -1,342 +0,0 @@ -/* - * Copyright 2002-2004, Instant802 Networks, Inc. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#include <linux/module.h> -#include <linux/netdevice.h> -#include <linux/types.h> -#include <linux/slab.h> -#include <linux/skbuff.h> - -#include <net/d80211.h> -#include "ieee80211_i.h" -#include "ieee80211_rate.h" - - -/* Maximum number of seconds to wait for the traffic load to get below - * threshold before forcing a passive scan. */ -#define MAX_SCAN_WAIT 60 -/* Threshold (pkts/sec TX or RX) for delaying passive scan */ -#define SCAN_TXRX_THRESHOLD 75 - -static void get_channel_params(struct ieee80211_local *local, int channel, - struct ieee80211_hw_mode **mode, - struct ieee80211_channel **chan) -{ - struct ieee80211_hw_mode *m; - - list_for_each_entry(m, &local->modes_list, list) { - *mode = m; - if (m->mode == local->hw.conf.phymode) - break; - } - local->scan.mode = m; - local->scan.chan_idx = 0; - do { - *chan = &m->channels[local->scan.chan_idx]; - if ((*chan)->chan == channel) - return; - local->scan.chan_idx++; - } while (local->scan.chan_idx < m->num_channels); - *chan = NULL; -} - - -static void next_chan_same_mode(struct ieee80211_local *local, - struct ieee80211_hw_mode **mode, - struct ieee80211_channel **chan) -{ - struct ieee80211_hw_mode *m; - int prev; - - list_for_each_entry(m, &local->modes_list, list) { - *mode = m; - if (m->mode == local->hw.conf.phymode) - break; - } - local->scan.mode = m; - - /* Select next channel - scan only channels marked with W_SCAN flag */ - prev = local->scan.chan_idx; - do { - local->scan.chan_idx++; - if (local->scan.chan_idx >= m->num_channels) - local->scan.chan_idx = 0; - *chan = &m->channels[local->scan.chan_idx]; - if ((*chan)->flag & IEEE80211_CHAN_W_SCAN) - break; - } while (local->scan.chan_idx != prev); -} - - -static void next_chan_all_modes(struct ieee80211_local *local, - struct ieee80211_hw_mode **mode, - struct ieee80211_channel **chan) -{ - struct ieee80211_hw_mode *prev_m; - int prev; - - /* Select next channel - scan only channels marked with W_SCAN flag */ - prev = local->scan.chan_idx; - prev_m = local->scan.mode; - do { - *mode = local->scan.mode; - local->scan.chan_idx++; - if (local->scan.chan_idx >= (*mode)->num_channels) { - struct list_head *next; - - local->scan.chan_idx = 0; - next = (*mode)->list.next; - if (next == &local->modes_list) - next = next->next; - *mode = list_entry(next, - struct ieee80211_hw_mode, - list); - local->scan.mode = *mode; - } - *chan = &(*mode)->channels[local->scan.chan_idx]; - if ((*chan)->flag & IEEE80211_CHAN_W_SCAN) - break; - } while (local->scan.chan_idx != prev || - local->scan.mode != prev_m); -} - - -static void ieee80211_scan_start(struct ieee80211_local *local, - struct ieee80211_scan_conf *conf) -{ - struct ieee80211_hw_mode *old_mode = local->scan.mode; - int old_chan_idx = local->scan.chan_idx; - struct ieee80211_hw_mode *mode = NULL; - struct ieee80211_channel *chan = NULL; - int ret; - - if (!local->ops->passive_scan) { - printk(KERN_DEBUG "%s: Scan handler called, yet the hardware " - "does not support passive scanning. Disabled.\n", - local->mdev->name); - return; - } - - if ((local->scan.tries < MAX_SCAN_WAIT && - local->scan.txrx_count > SCAN_TXRX_THRESHOLD)) { - local->scan.tries++; - /* Count TX/RX packets during one second interval and allow - * scan to start only if the number of packets is below the - * threshold. */ - local->scan.txrx_count = 0; - local->scan.timer.expires = jiffies + HZ; - add_timer(&local->scan.timer); - return; - } - - if (!local->scan.skb) { - printk(KERN_DEBUG "%s: Scan start called even though scan.skb " - "is not set\n", local->mdev->name); - } - - if (local->scan.our_mode_only) { - if (local->scan.channel > 0) { - get_channel_params(local, local->scan.channel, &mode, - &chan); - } else - next_chan_same_mode(local, &mode, &chan); - } - else - next_chan_all_modes(local, &mode, &chan); - - conf->scan_channel = chan->chan; - conf->scan_freq = chan->freq; - conf->scan_channel_val = chan->val; - conf->scan_phymode = mode->mode; - conf->scan_power_level = chan->power_level; - conf->scan_antenna_max = chan->antenna_max; - conf->scan_time = 2 * local->hw.channel_change_time + - local->scan.time; /* 10ms scan time+hardware changes */ - conf->skb = local->scan.skb ? - skb_clone(local->scan.skb, GFP_ATOMIC) : NULL; - conf->tx_control = &local->scan.tx_control; -#if 0 - printk(KERN_DEBUG "%s: Doing scan on mode: %d freq: %d chan: %d " - "for %d ms\n", - local->mdev->name, conf->scan_phymode, conf->scan_freq, - conf->scan_channel, conf->scan_time); -#endif - local->scan.rx_packets = 0; - local->scan.rx_beacon = 0; - local->scan.freq = chan->freq; - local->scan.in_scan = 1; - - ieee80211_netif_oper(local_to_hw(local), NETIF_STOP); - - ret = local->ops->passive_scan(local_to_hw(local), - IEEE80211_SCAN_START, conf); - - if (ret == 0) { - long usec = local->hw.channel_change_time + - local->scan.time; - usec += 1000000L / HZ - 1; - usec /= 1000000L / HZ; - local->scan.timer.expires = jiffies + usec; - } else { - local->scan.in_scan = 0; - if (conf->skb) - dev_kfree_skb(conf->skb); - ieee80211_netif_oper(local_to_hw(local), NETIF_WAKE); - if (ret == -EAGAIN) { - local->scan.timer.expires = jiffies + - (local->scan.interval * HZ / 100); - local->scan.mode = old_mode; - local->scan.chan_idx = old_chan_idx; - } else { - printk(KERN_DEBUG "%s: Got unknown error from " - "passive_scan %d\n", local->mdev->name, ret); - local->scan.timer.expires = jiffies + - (local->scan.interval * HZ); - } - local->scan.in_scan = 0; - } - - add_timer(&local->scan.timer); -} - - -static void ieee80211_scan_stop(struct ieee80211_local *local, - struct ieee80211_scan_conf *conf) -{ - struct ieee80211_hw_mode *mode; - struct ieee80211_channel *chan; - int wait; - - if (!local->ops->passive_scan) - return; - - mode = local->scan.mode; - - if (local->scan.chan_idx >= mode->num_channels) - local->scan.chan_idx = 0; - - chan = &mode->channels[local->scan.chan_idx]; - - local->ops->passive_scan(local_to_hw(local), IEEE80211_SCAN_END, - conf); - -#ifdef CONFIG_D80211_VERBOSE_DEBUG - printk(KERN_DEBUG "%s: Did scan on mode: %d freq: %d chan: %d " - "GOT: %d Beacon: %d (%d)\n", - local->mdev->name, - mode->mode, chan->freq, chan->chan, - local->scan.rx_packets, local->scan.rx_beacon, - local->scan.tries); -#endif /* CONFIG_D80211_VERBOSE_DEBUG */ - local->scan.num_scans++; - - local->scan.in_scan = 0; - ieee80211_netif_oper(local_to_hw(local), NETIF_WAKE); - - local->scan.tries = 0; - /* Use random interval of scan.interval .. 2 * scan.interval */ - wait = (local->scan.interval * HZ * ((net_random() & 127) + 128)) / - 128; - local->scan.timer.expires = jiffies + wait; - - add_timer(&local->scan.timer); -} - - -static void ieee80211_scan_handler(unsigned long ullocal) -{ - struct ieee80211_local *local = (struct ieee80211_local *) ullocal; - struct ieee80211_scan_conf conf; - - if (local->scan.interval == 0 && !local->scan.in_scan) { - /* Passive scanning is disabled - keep the timer always - * running to make code cleaner. */ - local->scan.timer.expires = jiffies + 10 * HZ; - add_timer(&local->scan.timer); - return; - } - - memset(&conf, 0, sizeof(struct ieee80211_scan_conf)); - conf.running_freq = local->hw.conf.freq; - conf.running_channel = local->hw.conf.channel; - conf.running_phymode = local->hw.conf.phymode; - conf.running_channel_val = local->hw.conf.channel_val; - conf.running_power_level = local->hw.conf.power_level; - conf.running_antenna_max = local->hw.conf.antenna_max; - - if (local->scan.in_scan == 0) - ieee80211_scan_start(local, &conf); - else - ieee80211_scan_stop(local, &conf); -} - - -void ieee80211_init_scan(struct ieee80211_local *local) -{ - struct ieee80211_hdr hdr; - u16 fc; - int len = 10; - struct rate_control_extra extra; - - /* Only initialize passive scanning if the hardware supports it */ - if (!local->ops->passive_scan) { - local->scan.skb = NULL; - memset(&local->scan.tx_control, 0, - sizeof(local->scan.tx_control)); - printk(KERN_DEBUG "%s: Does not support passive scan, " - "disabled\n", local->mdev->name); - return; - } - - local->scan.interval = 0; - local->scan.our_mode_only = 1; - local->scan.time = 10000; - local->scan.timer.function = ieee80211_scan_handler; - local->scan.timer.data = (unsigned long) local; - local->scan.timer.expires = jiffies + local->scan.interval * HZ; - add_timer(&local->scan.timer); - - /* Create a CTS from for broadcasting before - * the low level changes channels */ - local->scan.skb = alloc_skb(len, GFP_KERNEL); - if (!local->scan.skb) { - printk(KERN_WARNING "%s: Failed to allocate CTS packet for " - "passive scan\n", local->mdev->name); - return; - } - - fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS; - hdr.frame_control = cpu_to_le16(fc); - hdr.duration_id = - cpu_to_le16(2 * local->hw.channel_change_time + - local->scan.time); - memcpy(hdr.addr1, local->mdev->dev_addr, ETH_ALEN); /* DA */ - hdr.seq_ctrl = 0; - - memcpy(skb_put(local->scan.skb, len), &hdr, len); - - memset(&local->scan.tx_control, 0, sizeof(local->scan.tx_control)); - local->scan.tx_control.key_idx = HW_KEY_IDX_INVALID; - local->scan.tx_control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT; - memset(&extra, 0, sizeof(extra)); - extra.endidx = local->num_curr_rates; - local->scan.tx_control.tx_rate = - rate_control_get_rate(local, local->mdev, - local->scan.skb, &extra)->val; - local->scan.tx_control.flags |= IEEE80211_TXCTL_NO_ACK; -} - - -void ieee80211_stop_scan(struct ieee80211_local *local) -{ - if (local->ops->passive_scan) { - del_timer_sync(&local->scan.timer); - dev_kfree_skb(local->scan.skb); - local->scan.skb = NULL; - } -} |