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![Johannes Berg](/assets/img/avatar_default.png)
Here's a first patch to move some code from mlme.c to a new file called scan.c. The end result will hopefully be a more manageable mlme.c. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
553 lines
15 KiB
C
553 lines
15 KiB
C
/*
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* BSS client mode implementation
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* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
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* Copyright 2004, Instant802 Networks, Inc.
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* Copyright 2005, Devicescape Software, Inc.
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* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/wireless.h>
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#include <linux/if_arp.h>
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#include <net/mac80211.h>
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#include <net/iw_handler.h>
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#include "ieee80211_i.h"
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#define IEEE80211_PROBE_DELAY (HZ / 33)
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#define IEEE80211_CHANNEL_TIME (HZ / 33)
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#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
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static void ieee80211_send_nullfunc(struct ieee80211_local *local,
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struct ieee80211_sub_if_data *sdata,
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int powersave)
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{
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struct sk_buff *skb;
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struct ieee80211_hdr *nullfunc;
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__le16 fc;
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skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
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if (!skb) {
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printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
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"frame\n", sdata->dev->name);
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return;
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}
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skb_reserve(skb, local->hw.extra_tx_headroom);
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nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
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memset(nullfunc, 0, 24);
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fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
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IEEE80211_FCTL_TODS);
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if (powersave)
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fc |= cpu_to_le16(IEEE80211_FCTL_PM);
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nullfunc->frame_control = fc;
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memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
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memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
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memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
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ieee80211_sta_tx(sdata, skb, 0);
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}
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static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
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{
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if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
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ieee80211_vif_is_mesh(&sdata->vif))
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ieee80211_sta_timer((unsigned long)sdata);
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}
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void ieee80211_scan_completed(struct ieee80211_hw *hw)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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struct ieee80211_sub_if_data *sdata;
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union iwreq_data wrqu;
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local->last_scan_completed = jiffies;
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memset(&wrqu, 0, sizeof(wrqu));
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wireless_send_event(local->scan_sdata->dev, SIOCGIWSCAN, &wrqu, NULL);
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if (local->sta_hw_scanning) {
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local->sta_hw_scanning = 0;
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if (ieee80211_hw_config(local))
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printk(KERN_DEBUG "%s: failed to restore operational "
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"channel after scan\n", wiphy_name(local->hw.wiphy));
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/* Restart STA timer for HW scan case */
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rcu_read_lock();
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list_for_each_entry_rcu(sdata, &local->interfaces, list)
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ieee80211_restart_sta_timer(sdata);
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rcu_read_unlock();
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goto done;
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}
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local->sta_sw_scanning = 0;
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if (ieee80211_hw_config(local))
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printk(KERN_DEBUG "%s: failed to restore operational "
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"channel after scan\n", wiphy_name(local->hw.wiphy));
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netif_tx_lock_bh(local->mdev);
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netif_addr_lock(local->mdev);
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local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
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local->ops->configure_filter(local_to_hw(local),
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FIF_BCN_PRBRESP_PROMISC,
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&local->filter_flags,
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local->mdev->mc_count,
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local->mdev->mc_list);
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netif_addr_unlock(local->mdev);
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netif_tx_unlock_bh(local->mdev);
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rcu_read_lock();
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list_for_each_entry_rcu(sdata, &local->interfaces, list) {
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/* Tell AP we're back */
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if (sdata->vif.type == IEEE80211_IF_TYPE_STA) {
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if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
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ieee80211_send_nullfunc(local, sdata, 0);
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netif_tx_wake_all_queues(sdata->dev);
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}
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} else
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netif_tx_wake_all_queues(sdata->dev);
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ieee80211_restart_sta_timer(sdata);
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}
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rcu_read_unlock();
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done:
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ieee80211_mlme_notify_scan_completed(local);
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}
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EXPORT_SYMBOL(ieee80211_scan_completed);
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void ieee80211_sta_scan_work(struct work_struct *work)
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{
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struct ieee80211_local *local =
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container_of(work, struct ieee80211_local, scan_work.work);
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struct ieee80211_sub_if_data *sdata = local->scan_sdata;
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struct ieee80211_supported_band *sband;
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struct ieee80211_channel *chan;
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int skip;
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unsigned long next_delay = 0;
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if (!local->sta_sw_scanning)
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return;
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switch (local->scan_state) {
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case SCAN_SET_CHANNEL:
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/*
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* Get current scan band. scan_band may be IEEE80211_NUM_BANDS
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* after we successfully scanned the last channel of the last
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* band (and the last band is supported by the hw)
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*/
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if (local->scan_band < IEEE80211_NUM_BANDS)
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sband = local->hw.wiphy->bands[local->scan_band];
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else
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sband = NULL;
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/*
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* If we are at an unsupported band and have more bands
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* left to scan, advance to the next supported one.
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*/
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while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) {
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local->scan_band++;
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sband = local->hw.wiphy->bands[local->scan_band];
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local->scan_channel_idx = 0;
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}
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/* if no more bands/channels left, complete scan */
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if (!sband || local->scan_channel_idx >= sband->n_channels) {
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ieee80211_scan_completed(local_to_hw(local));
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return;
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}
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skip = 0;
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chan = &sband->channels[local->scan_channel_idx];
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if (chan->flags & IEEE80211_CHAN_DISABLED ||
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(sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
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chan->flags & IEEE80211_CHAN_NO_IBSS))
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skip = 1;
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if (!skip) {
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local->scan_channel = chan;
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if (ieee80211_hw_config(local)) {
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printk(KERN_DEBUG "%s: failed to set freq to "
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"%d MHz for scan\n", wiphy_name(local->hw.wiphy),
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chan->center_freq);
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skip = 1;
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}
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}
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/* advance state machine to next channel/band */
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local->scan_channel_idx++;
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if (local->scan_channel_idx >= sband->n_channels) {
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/*
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* scan_band may end up == IEEE80211_NUM_BANDS, but
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* we'll catch that case above and complete the scan
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* if that is the case.
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*/
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local->scan_band++;
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local->scan_channel_idx = 0;
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}
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if (skip)
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break;
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next_delay = IEEE80211_PROBE_DELAY +
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usecs_to_jiffies(local->hw.channel_change_time);
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local->scan_state = SCAN_SEND_PROBE;
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break;
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case SCAN_SEND_PROBE:
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next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
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local->scan_state = SCAN_SET_CHANNEL;
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if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN)
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break;
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ieee80211_send_probe_req(sdata, NULL, local->scan_ssid,
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local->scan_ssid_len);
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next_delay = IEEE80211_CHANNEL_TIME;
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break;
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}
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if (local->sta_sw_scanning)
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queue_delayed_work(local->hw.workqueue, &local->scan_work,
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next_delay);
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}
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int ieee80211_sta_start_scan(struct ieee80211_sub_if_data *scan_sdata,
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u8 *ssid, size_t ssid_len)
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{
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struct ieee80211_local *local = scan_sdata->local;
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struct ieee80211_sub_if_data *sdata;
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if (ssid_len > IEEE80211_MAX_SSID_LEN)
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return -EINVAL;
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/* MLME-SCAN.request (page 118) page 144 (11.1.3.1)
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* BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
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* BSSID: MACAddress
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* SSID
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* ScanType: ACTIVE, PASSIVE
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* ProbeDelay: delay (in microseconds) to be used prior to transmitting
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* a Probe frame during active scanning
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* ChannelList
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* MinChannelTime (>= ProbeDelay), in TU
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* MaxChannelTime: (>= MinChannelTime), in TU
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*/
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/* MLME-SCAN.confirm
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* BSSDescriptionSet
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* ResultCode: SUCCESS, INVALID_PARAMETERS
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*/
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if (local->sta_sw_scanning || local->sta_hw_scanning) {
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if (local->scan_sdata == scan_sdata)
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return 0;
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return -EBUSY;
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}
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if (local->ops->hw_scan) {
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int rc = local->ops->hw_scan(local_to_hw(local),
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ssid, ssid_len);
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if (!rc) {
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local->sta_hw_scanning = 1;
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local->scan_sdata = scan_sdata;
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}
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return rc;
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}
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local->sta_sw_scanning = 1;
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rcu_read_lock();
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list_for_each_entry_rcu(sdata, &local->interfaces, list) {
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if (sdata->vif.type == IEEE80211_IF_TYPE_STA) {
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if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
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netif_tx_stop_all_queues(sdata->dev);
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ieee80211_send_nullfunc(local, sdata, 1);
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}
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} else
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netif_tx_stop_all_queues(sdata->dev);
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}
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rcu_read_unlock();
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if (ssid) {
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local->scan_ssid_len = ssid_len;
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memcpy(local->scan_ssid, ssid, ssid_len);
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} else
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local->scan_ssid_len = 0;
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local->scan_state = SCAN_SET_CHANNEL;
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local->scan_channel_idx = 0;
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local->scan_band = IEEE80211_BAND_2GHZ;
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local->scan_sdata = scan_sdata;
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netif_addr_lock_bh(local->mdev);
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local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
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local->ops->configure_filter(local_to_hw(local),
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FIF_BCN_PRBRESP_PROMISC,
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&local->filter_flags,
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local->mdev->mc_count,
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local->mdev->mc_list);
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netif_addr_unlock_bh(local->mdev);
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/* TODO: start scan as soon as all nullfunc frames are ACKed */
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queue_delayed_work(local->hw.workqueue, &local->scan_work,
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IEEE80211_CHANNEL_TIME);
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return 0;
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}
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int ieee80211_sta_req_scan(struct ieee80211_sub_if_data *sdata, u8 *ssid, size_t ssid_len)
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{
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struct ieee80211_if_sta *ifsta = &sdata->u.sta;
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struct ieee80211_local *local = sdata->local;
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if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
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return ieee80211_sta_start_scan(sdata, ssid, ssid_len);
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if (local->sta_sw_scanning || local->sta_hw_scanning) {
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if (local->scan_sdata == sdata)
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return 0;
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return -EBUSY;
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}
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ifsta->scan_ssid_len = ssid_len;
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if (ssid_len)
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memcpy(ifsta->scan_ssid, ssid, ssid_len);
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set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
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queue_work(local->hw.workqueue, &ifsta->work);
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return 0;
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}
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static void ieee80211_sta_add_scan_ies(struct iw_request_info *info,
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struct ieee80211_sta_bss *bss,
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char **current_ev, char *end_buf)
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{
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u8 *pos, *end, *next;
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struct iw_event iwe;
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if (bss == NULL || bss->ies == NULL)
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return;
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/*
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* If needed, fragment the IEs buffer (at IE boundaries) into short
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* enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
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*/
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pos = bss->ies;
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end = pos + bss->ies_len;
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while (end - pos > IW_GENERIC_IE_MAX) {
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next = pos + 2 + pos[1];
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while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
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next = next + 2 + next[1];
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memset(&iwe, 0, sizeof(iwe));
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iwe.cmd = IWEVGENIE;
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iwe.u.data.length = next - pos;
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*current_ev = iwe_stream_add_point(info, *current_ev,
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end_buf, &iwe, pos);
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pos = next;
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}
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if (end > pos) {
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memset(&iwe, 0, sizeof(iwe));
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iwe.cmd = IWEVGENIE;
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iwe.u.data.length = end - pos;
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*current_ev = iwe_stream_add_point(info, *current_ev,
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end_buf, &iwe, pos);
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}
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}
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static char *
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ieee80211_sta_scan_result(struct ieee80211_local *local,
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struct iw_request_info *info,
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struct ieee80211_sta_bss *bss,
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char *current_ev, char *end_buf)
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{
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struct iw_event iwe;
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char *buf;
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if (time_after(jiffies,
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bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
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return current_ev;
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memset(&iwe, 0, sizeof(iwe));
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iwe.cmd = SIOCGIWAP;
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iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
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memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
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current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
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IW_EV_ADDR_LEN);
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memset(&iwe, 0, sizeof(iwe));
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iwe.cmd = SIOCGIWESSID;
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if (bss_mesh_cfg(bss)) {
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iwe.u.data.length = bss_mesh_id_len(bss);
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iwe.u.data.flags = 1;
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current_ev = iwe_stream_add_point(info, current_ev, end_buf,
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&iwe, bss_mesh_id(bss));
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} else {
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iwe.u.data.length = bss->ssid_len;
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iwe.u.data.flags = 1;
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current_ev = iwe_stream_add_point(info, current_ev, end_buf,
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&iwe, bss->ssid);
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}
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if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
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|| bss_mesh_cfg(bss)) {
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memset(&iwe, 0, sizeof(iwe));
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iwe.cmd = SIOCGIWMODE;
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if (bss_mesh_cfg(bss))
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iwe.u.mode = IW_MODE_MESH;
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else if (bss->capability & WLAN_CAPABILITY_ESS)
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iwe.u.mode = IW_MODE_MASTER;
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else
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iwe.u.mode = IW_MODE_ADHOC;
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current_ev = iwe_stream_add_event(info, current_ev, end_buf,
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&iwe, IW_EV_UINT_LEN);
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}
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memset(&iwe, 0, sizeof(iwe));
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iwe.cmd = SIOCGIWFREQ;
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iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq);
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iwe.u.freq.e = 0;
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current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
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IW_EV_FREQ_LEN);
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memset(&iwe, 0, sizeof(iwe));
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iwe.cmd = SIOCGIWFREQ;
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iwe.u.freq.m = bss->freq;
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iwe.u.freq.e = 6;
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current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
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IW_EV_FREQ_LEN);
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memset(&iwe, 0, sizeof(iwe));
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iwe.cmd = IWEVQUAL;
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iwe.u.qual.qual = bss->qual;
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iwe.u.qual.level = bss->signal;
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iwe.u.qual.noise = bss->noise;
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iwe.u.qual.updated = local->wstats_flags;
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current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
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IW_EV_QUAL_LEN);
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memset(&iwe, 0, sizeof(iwe));
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iwe.cmd = SIOCGIWENCODE;
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if (bss->capability & WLAN_CAPABILITY_PRIVACY)
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iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
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else
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iwe.u.data.flags = IW_ENCODE_DISABLED;
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iwe.u.data.length = 0;
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current_ev = iwe_stream_add_point(info, current_ev, end_buf,
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&iwe, "");
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ieee80211_sta_add_scan_ies(info, bss, ¤t_ev, end_buf);
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if (bss->supp_rates_len > 0) {
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/* display all supported rates in readable format */
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char *p = current_ev + iwe_stream_lcp_len(info);
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int i;
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memset(&iwe, 0, sizeof(iwe));
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iwe.cmd = SIOCGIWRATE;
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/* Those two flags are ignored... */
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iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
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for (i = 0; i < bss->supp_rates_len; i++) {
|
|
iwe.u.bitrate.value = ((bss->supp_rates[i] &
|
|
0x7f) * 500000);
|
|
p = iwe_stream_add_value(info, current_ev, p,
|
|
end_buf, &iwe, IW_EV_PARAM_LEN);
|
|
}
|
|
current_ev = p;
|
|
}
|
|
|
|
buf = kmalloc(30, GFP_ATOMIC);
|
|
if (buf) {
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = IWEVCUSTOM;
|
|
sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev, end_buf,
|
|
&iwe, buf);
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = IWEVCUSTOM;
|
|
sprintf(buf, " Last beacon: %dms ago",
|
|
jiffies_to_msecs(jiffies - bss->last_update));
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf, &iwe, buf);
|
|
kfree(buf);
|
|
}
|
|
|
|
if (bss_mesh_cfg(bss)) {
|
|
u8 *cfg = bss_mesh_cfg(bss);
|
|
buf = kmalloc(50, GFP_ATOMIC);
|
|
if (buf) {
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = IWEVCUSTOM;
|
|
sprintf(buf, "Mesh network (version %d)", cfg[0]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
sprintf(buf, "Path Selection Protocol ID: "
|
|
"0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
|
|
cfg[4]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
sprintf(buf, "Path Selection Metric ID: "
|
|
"0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
|
|
cfg[8]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
sprintf(buf, "Congestion Control Mode ID: "
|
|
"0x%02X%02X%02X%02X", cfg[9], cfg[10],
|
|
cfg[11], cfg[12]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
sprintf(buf, "Channel Precedence: "
|
|
"0x%02X%02X%02X%02X", cfg[13], cfg[14],
|
|
cfg[15], cfg[16]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
kfree(buf);
|
|
}
|
|
}
|
|
|
|
return current_ev;
|
|
}
|
|
|
|
|
|
int ieee80211_sta_scan_results(struct ieee80211_local *local,
|
|
struct iw_request_info *info,
|
|
char *buf, size_t len)
|
|
{
|
|
char *current_ev = buf;
|
|
char *end_buf = buf + len;
|
|
struct ieee80211_sta_bss *bss;
|
|
|
|
spin_lock_bh(&local->sta_bss_lock);
|
|
list_for_each_entry(bss, &local->sta_bss_list, list) {
|
|
if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
|
|
spin_unlock_bh(&local->sta_bss_lock);
|
|
return -E2BIG;
|
|
}
|
|
current_ev = ieee80211_sta_scan_result(local, info, bss,
|
|
current_ev, end_buf);
|
|
}
|
|
spin_unlock_bh(&local->sta_bss_lock);
|
|
return current_ev - buf;
|
|
}
|