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mac80211: automatic IBSS channel selection 

When joining an ad-hoc network, the user is currently required to specify
the channel. The network will not be joined otherwise, unless it happens
to be sitting on the currently active channel.

This patch implements automatic channel selection when the user has not
locked the interface onto a specific channel.

Signed-off-by: Daniel Drake <dsd@gentoo.org>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Daniel Drake 2008-07-19 23:31:17 +01:00 committed by John W. Linville
parent b5d7be5e66
commit 80693ceb78
1 changed files with 16 additions and 4 deletions
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20
net/mac80211/mlme.c
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@ -3663,11 +3663,21 @@ static int ieee80211_sta_find_ibss(struct net_device *dev,
"%s\n", print_mac(mac, bssid),
print_mac(mac2, ifsta->bssid));
#endif /* CONFIG_MAC80211_IBSS_DEBUG */
if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0 &&
(bss = ieee80211_rx_bss_get(dev, bssid,
local->hw.conf.channel->center_freq,
ifsta->ssid, ifsta->ssid_len))) {
if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
int ret;
int search_freq;
if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
search_freq = bss->freq;
else
search_freq = local->hw.conf.channel->center_freq;
bss = ieee80211_rx_bss_get(dev, bssid, search_freq,
ifsta->ssid, ifsta->ssid_len);
if (!bss)
goto dont_join;
printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
" based on configured SSID\n",
dev->name, print_mac(mac, bssid));
@ -3675,6 +3685,8 @@ static int ieee80211_sta_find_ibss(struct net_device *dev,
ieee80211_rx_bss_put(local, bss);
return ret;
}
dont_join:
#ifdef CONFIG_MAC80211_IBSS_DEBUG
printk(KERN_DEBUG " did not try to join ibss\n");
#endif /* CONFIG_MAC80211_IBSS_DEBUG */